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[exim.git] / src / src / expand.c
1 /*************************************************
2 * Exim - an Internet mail transport agent *
3 *************************************************/
4
5 /* Copyright (c) University of Cambridge 1995 - 2018 */
6 /* See the file NOTICE for conditions of use and distribution. */
7
8
9 /* Functions for handling string expansion. */
10
11
12 #include "exim.h"
13
14 /* Recursively called function */
15
16 static uschar *expand_string_internal(const uschar *, BOOL, const uschar **, BOOL, BOOL, BOOL *);
17 static int_eximarith_t expanded_string_integer(const uschar *, BOOL);
18
19 #ifdef STAND_ALONE
20 # ifndef SUPPORT_CRYPTEQ
21 # define SUPPORT_CRYPTEQ
22 # endif
23 #endif
24
25 #ifdef LOOKUP_LDAP
26 # include "lookups/ldap.h"
27 #endif
28
29 #ifdef SUPPORT_CRYPTEQ
30 # ifdef CRYPT_H
31 # include <crypt.h>
32 # endif
33 # ifndef HAVE_CRYPT16
34 extern char* crypt16(char*, char*);
35 # endif
36 #endif
37
38 /* The handling of crypt16() is a mess. I will record below the analysis of the
39 mess that was sent to me. We decided, however, to make changing this very low
40 priority, because in practice people are moving away from the crypt()
41 algorithms nowadays, so it doesn't seem worth it.
42
43 <quote>
44 There is an algorithm named "crypt16" in Ultrix and Tru64. It crypts
45 the first 8 characters of the password using a 20-round version of crypt
46 (standard crypt does 25 rounds). It then crypts the next 8 characters,
47 or an empty block if the password is less than 9 characters, using a
48 20-round version of crypt and the same salt as was used for the first
49 block. Characters after the first 16 are ignored. It always generates
50 a 16-byte hash, which is expressed together with the salt as a string
51 of 24 base 64 digits. Here are some links to peruse:
52
53 http://cvs.pld.org.pl/pam/pamcrypt/crypt16.c?rev=1.2
54 http://seclists.org/bugtraq/1999/Mar/0076.html
55
56 There's a different algorithm named "bigcrypt" in HP-UX, Digital Unix,
57 and OSF/1. This is the same as the standard crypt if given a password
58 of 8 characters or less. If given more, it first does the same as crypt
59 using the first 8 characters, then crypts the next 8 (the 9th to 16th)
60 using as salt the first two base 64 digits from the first hash block.
61 If the password is more than 16 characters then it crypts the 17th to 24th
62 characters using as salt the first two base 64 digits from the second hash
63 block. And so on: I've seen references to it cutting off the password at
64 40 characters (5 blocks), 80 (10 blocks), or 128 (16 blocks). Some links:
65
66 http://cvs.pld.org.pl/pam/pamcrypt/bigcrypt.c?rev=1.2
67 http://seclists.org/bugtraq/1999/Mar/0109.html
68 http://h30097.www3.hp.com/docs/base_doc/DOCUMENTATION/HTML/AA-Q0R2D-
69 TET1_html/sec.c222.html#no_id_208
70
71 Exim has something it calls "crypt16". It will either use a native
72 crypt16 or its own implementation. A native crypt16 will presumably
73 be the one that I called "crypt16" above. The internal "crypt16"
74 function, however, is a two-block-maximum implementation of what I called
75 "bigcrypt". The documentation matches the internal code.
76
77 I suspect that whoever did the "crypt16" stuff for Exim didn't realise
78 that crypt16 and bigcrypt were different things.
79
80 Exim uses the LDAP-style scheme identifier "{crypt16}" to refer
81 to whatever it is using under that name. This unfortunately sets a
82 precedent for using "{crypt16}" to identify two incompatible algorithms
83 whose output can't be distinguished. With "{crypt16}" thus rendered
84 ambiguous, I suggest you deprecate it and invent two new identifiers
85 for the two algorithms.
86
87 Both crypt16 and bigcrypt are very poor algorithms, btw. Hashing parts
88 of the password separately means they can be cracked separately, so
89 the double-length hash only doubles the cracking effort instead of
90 squaring it. I recommend salted SHA-1 ({SSHA}), or the Blowfish-based
91 bcrypt ({CRYPT}$2a$).
92 </quote>
93 */
94
95
96
97 /*************************************************
98 * Local statics and tables *
99 *************************************************/
100
101 /* Table of item names, and corresponding switch numbers. The names must be in
102 alphabetical order. */
103
104 static uschar *item_table[] = {
105 US"acl",
106 US"authresults",
107 US"certextract",
108 US"dlfunc",
109 US"env",
110 US"extract",
111 US"filter",
112 US"hash",
113 US"hmac",
114 US"if",
115 #ifdef SUPPORT_I18N
116 US"imapfolder",
117 #endif
118 US"length",
119 US"listextract",
120 US"listquote",
121 US"lookup",
122 US"map",
123 US"nhash",
124 US"perl",
125 US"prvs",
126 US"prvscheck",
127 US"readfile",
128 US"readsocket",
129 US"reduce",
130 US"run",
131 US"sg",
132 US"sort",
133 #ifdef EXPERIMENTAL_SRS_NATIVE
134 US"srs_encode",
135 #endif
136 US"substr",
137 US"tr" };
138
139 enum {
140 EITEM_ACL,
141 EITEM_AUTHRESULTS,
142 EITEM_CERTEXTRACT,
143 EITEM_DLFUNC,
144 EITEM_ENV,
145 EITEM_EXTRACT,
146 EITEM_FILTER,
147 EITEM_HASH,
148 EITEM_HMAC,
149 EITEM_IF,
150 #ifdef SUPPORT_I18N
151 EITEM_IMAPFOLDER,
152 #endif
153 EITEM_LENGTH,
154 EITEM_LISTEXTRACT,
155 EITEM_LISTQUOTE,
156 EITEM_LOOKUP,
157 EITEM_MAP,
158 EITEM_NHASH,
159 EITEM_PERL,
160 EITEM_PRVS,
161 EITEM_PRVSCHECK,
162 EITEM_READFILE,
163 EITEM_READSOCK,
164 EITEM_REDUCE,
165 EITEM_RUN,
166 EITEM_SG,
167 EITEM_SORT,
168 #ifdef EXPERIMENTAL_SRS_NATIVE
169 EITEM_SRS_ENCODE,
170 #endif
171 EITEM_SUBSTR,
172 EITEM_TR };
173
174 /* Tables of operator names, and corresponding switch numbers. The names must be
175 in alphabetical order. There are two tables, because underscore is used in some
176 cases to introduce arguments, whereas for other it is part of the name. This is
177 an historical mis-design. */
178
179 static uschar *op_table_underscore[] = {
180 US"from_utf8",
181 US"local_part",
182 US"quote_local_part",
183 US"reverse_ip",
184 US"time_eval",
185 US"time_interval"
186 #ifdef SUPPORT_I18N
187 ,US"utf8_domain_from_alabel",
188 US"utf8_domain_to_alabel",
189 US"utf8_localpart_from_alabel",
190 US"utf8_localpart_to_alabel"
191 #endif
192 };
193
194 enum {
195 EOP_FROM_UTF8,
196 EOP_LOCAL_PART,
197 EOP_QUOTE_LOCAL_PART,
198 EOP_REVERSE_IP,
199 EOP_TIME_EVAL,
200 EOP_TIME_INTERVAL
201 #ifdef SUPPORT_I18N
202 ,EOP_UTF8_DOMAIN_FROM_ALABEL,
203 EOP_UTF8_DOMAIN_TO_ALABEL,
204 EOP_UTF8_LOCALPART_FROM_ALABEL,
205 EOP_UTF8_LOCALPART_TO_ALABEL
206 #endif
207 };
208
209 static uschar *op_table_main[] = {
210 US"address",
211 US"addresses",
212 US"base32",
213 US"base32d",
214 US"base62",
215 US"base62d",
216 US"base64",
217 US"base64d",
218 US"bless",
219 US"domain",
220 US"escape",
221 US"escape8bit",
222 US"eval",
223 US"eval10",
224 US"expand",
225 US"h",
226 US"hash",
227 US"hex2b64",
228 US"hexquote",
229 US"ipv6denorm",
230 US"ipv6norm",
231 US"l",
232 US"lc",
233 US"length",
234 US"listcount",
235 US"listnamed",
236 US"mask",
237 US"md5",
238 US"nh",
239 US"nhash",
240 US"quote",
241 US"randint",
242 US"rfc2047",
243 US"rfc2047d",
244 US"rxquote",
245 US"s",
246 US"sha1",
247 US"sha2",
248 US"sha256",
249 US"sha3",
250 US"stat",
251 US"str2b64",
252 US"strlen",
253 US"substr",
254 US"uc",
255 US"utf8clean" };
256
257 enum {
258 EOP_ADDRESS = nelem(op_table_underscore),
259 EOP_ADDRESSES,
260 EOP_BASE32,
261 EOP_BASE32D,
262 EOP_BASE62,
263 EOP_BASE62D,
264 EOP_BASE64,
265 EOP_BASE64D,
266 EOP_BLESS,
267 EOP_DOMAIN,
268 EOP_ESCAPE,
269 EOP_ESCAPE8BIT,
270 EOP_EVAL,
271 EOP_EVAL10,
272 EOP_EXPAND,
273 EOP_H,
274 EOP_HASH,
275 EOP_HEX2B64,
276 EOP_HEXQUOTE,
277 EOP_IPV6DENORM,
278 EOP_IPV6NORM,
279 EOP_L,
280 EOP_LC,
281 EOP_LENGTH,
282 EOP_LISTCOUNT,
283 EOP_LISTNAMED,
284 EOP_MASK,
285 EOP_MD5,
286 EOP_NH,
287 EOP_NHASH,
288 EOP_QUOTE,
289 EOP_RANDINT,
290 EOP_RFC2047,
291 EOP_RFC2047D,
292 EOP_RXQUOTE,
293 EOP_S,
294 EOP_SHA1,
295 EOP_SHA2,
296 EOP_SHA256,
297 EOP_SHA3,
298 EOP_STAT,
299 EOP_STR2B64,
300 EOP_STRLEN,
301 EOP_SUBSTR,
302 EOP_UC,
303 EOP_UTF8CLEAN };
304
305
306 /* Table of condition names, and corresponding switch numbers. The names must
307 be in alphabetical order. */
308
309 static uschar *cond_table[] = {
310 US"<",
311 US"<=",
312 US"=",
313 US"==", /* Backward compatibility */
314 US">",
315 US">=",
316 US"acl",
317 US"and",
318 US"bool",
319 US"bool_lax",
320 US"crypteq",
321 US"def",
322 US"eq",
323 US"eqi",
324 US"exists",
325 US"first_delivery",
326 US"forall",
327 US"forall_json",
328 US"forall_jsons",
329 US"forany",
330 US"forany_json",
331 US"forany_jsons",
332 US"ge",
333 US"gei",
334 US"gt",
335 US"gti",
336 #ifdef EXPERIMENTAL_SRS_NATIVE
337 US"inbound_srs",
338 #endif
339 US"inlist",
340 US"inlisti",
341 US"isip",
342 US"isip4",
343 US"isip6",
344 US"ldapauth",
345 US"le",
346 US"lei",
347 US"lt",
348 US"lti",
349 US"match",
350 US"match_address",
351 US"match_domain",
352 US"match_ip",
353 US"match_local_part",
354 US"or",
355 US"pam",
356 US"pwcheck",
357 US"queue_running",
358 US"radius",
359 US"saslauthd"
360 };
361
362 enum {
363 ECOND_NUM_L,
364 ECOND_NUM_LE,
365 ECOND_NUM_E,
366 ECOND_NUM_EE,
367 ECOND_NUM_G,
368 ECOND_NUM_GE,
369 ECOND_ACL,
370 ECOND_AND,
371 ECOND_BOOL,
372 ECOND_BOOL_LAX,
373 ECOND_CRYPTEQ,
374 ECOND_DEF,
375 ECOND_STR_EQ,
376 ECOND_STR_EQI,
377 ECOND_EXISTS,
378 ECOND_FIRST_DELIVERY,
379 ECOND_FORALL,
380 ECOND_FORALL_JSON,
381 ECOND_FORALL_JSONS,
382 ECOND_FORANY,
383 ECOND_FORANY_JSON,
384 ECOND_FORANY_JSONS,
385 ECOND_STR_GE,
386 ECOND_STR_GEI,
387 ECOND_STR_GT,
388 ECOND_STR_GTI,
389 #ifdef EXPERIMENTAL_SRS_NATIVE
390 ECOND_INBOUND_SRS,
391 #endif
392 ECOND_INLIST,
393 ECOND_INLISTI,
394 ECOND_ISIP,
395 ECOND_ISIP4,
396 ECOND_ISIP6,
397 ECOND_LDAPAUTH,
398 ECOND_STR_LE,
399 ECOND_STR_LEI,
400 ECOND_STR_LT,
401 ECOND_STR_LTI,
402 ECOND_MATCH,
403 ECOND_MATCH_ADDRESS,
404 ECOND_MATCH_DOMAIN,
405 ECOND_MATCH_IP,
406 ECOND_MATCH_LOCAL_PART,
407 ECOND_OR,
408 ECOND_PAM,
409 ECOND_PWCHECK,
410 ECOND_QUEUE_RUNNING,
411 ECOND_RADIUS,
412 ECOND_SASLAUTHD
413 };
414
415
416 /* Types of table entry */
417
418 enum vtypes {
419 vtype_int, /* value is address of int */
420 vtype_filter_int, /* ditto, but recognized only when filtering */
421 vtype_ino, /* value is address of ino_t (not always an int) */
422 vtype_uid, /* value is address of uid_t (not always an int) */
423 vtype_gid, /* value is address of gid_t (not always an int) */
424 vtype_bool, /* value is address of bool */
425 vtype_stringptr, /* value is address of pointer to string */
426 vtype_msgbody, /* as stringptr, but read when first required */
427 vtype_msgbody_end, /* ditto, the end of the message */
428 vtype_msgheaders, /* the message's headers, processed */
429 vtype_msgheaders_raw, /* the message's headers, unprocessed */
430 vtype_localpart, /* extract local part from string */
431 vtype_domain, /* extract domain from string */
432 vtype_string_func, /* value is string returned by given function */
433 vtype_todbsdin, /* value not used; generate BSD inbox tod */
434 vtype_tode, /* value not used; generate tod in epoch format */
435 vtype_todel, /* value not used; generate tod in epoch/usec format */
436 vtype_todf, /* value not used; generate full tod */
437 vtype_todl, /* value not used; generate log tod */
438 vtype_todlf, /* value not used; generate log file datestamp tod */
439 vtype_todzone, /* value not used; generate time zone only */
440 vtype_todzulu, /* value not used; generate zulu tod */
441 vtype_reply, /* value not used; get reply from headers */
442 vtype_pid, /* value not used; result is pid */
443 vtype_host_lookup, /* value not used; get host name */
444 vtype_load_avg, /* value not used; result is int from os_getloadavg */
445 vtype_pspace, /* partition space; value is T/F for spool/log */
446 vtype_pinodes, /* partition inodes; value is T/F for spool/log */
447 vtype_cert /* SSL certificate */
448 #ifndef DISABLE_DKIM
449 ,vtype_dkim /* Lookup of value in DKIM signature */
450 #endif
451 };
452
453 /* Type for main variable table */
454
455 typedef struct {
456 const char *name;
457 enum vtypes type;
458 void *value;
459 } var_entry;
460
461 /* Type for entries pointing to address/length pairs. Not currently
462 in use. */
463
464 typedef struct {
465 uschar **address;
466 int *length;
467 } alblock;
468
469 static uschar * fn_recipients(void);
470 typedef uschar * stringptr_fn_t(void);
471 static uschar * fn_queue_size(void);
472
473 /* This table must be kept in alphabetical order. */
474
475 static var_entry var_table[] = {
476 /* WARNING: Do not invent variables whose names start acl_c or acl_m because
477 they will be confused with user-creatable ACL variables. */
478 { "acl_arg1", vtype_stringptr, &acl_arg[0] },
479 { "acl_arg2", vtype_stringptr, &acl_arg[1] },
480 { "acl_arg3", vtype_stringptr, &acl_arg[2] },
481 { "acl_arg4", vtype_stringptr, &acl_arg[3] },
482 { "acl_arg5", vtype_stringptr, &acl_arg[4] },
483 { "acl_arg6", vtype_stringptr, &acl_arg[5] },
484 { "acl_arg7", vtype_stringptr, &acl_arg[6] },
485 { "acl_arg8", vtype_stringptr, &acl_arg[7] },
486 { "acl_arg9", vtype_stringptr, &acl_arg[8] },
487 { "acl_narg", vtype_int, &acl_narg },
488 { "acl_verify_message", vtype_stringptr, &acl_verify_message },
489 { "address_data", vtype_stringptr, &deliver_address_data },
490 { "address_file", vtype_stringptr, &address_file },
491 { "address_pipe", vtype_stringptr, &address_pipe },
492 #ifdef EXPERIMENTAL_ARC
493 { "arc_domains", vtype_string_func, (void *) &fn_arc_domains },
494 { "arc_oldest_pass", vtype_int, &arc_oldest_pass },
495 { "arc_state", vtype_stringptr, &arc_state },
496 { "arc_state_reason", vtype_stringptr, &arc_state_reason },
497 #endif
498 { "authenticated_fail_id",vtype_stringptr, &authenticated_fail_id },
499 { "authenticated_id", vtype_stringptr, &authenticated_id },
500 { "authenticated_sender",vtype_stringptr, &authenticated_sender },
501 { "authentication_failed",vtype_int, &authentication_failed },
502 #ifdef WITH_CONTENT_SCAN
503 { "av_failed", vtype_int, &av_failed },
504 #endif
505 #ifdef EXPERIMENTAL_BRIGHTMAIL
506 { "bmi_alt_location", vtype_stringptr, &bmi_alt_location },
507 { "bmi_base64_tracker_verdict", vtype_stringptr, &bmi_base64_tracker_verdict },
508 { "bmi_base64_verdict", vtype_stringptr, &bmi_base64_verdict },
509 { "bmi_deliver", vtype_int, &bmi_deliver },
510 #endif
511 { "body_linecount", vtype_int, &body_linecount },
512 { "body_zerocount", vtype_int, &body_zerocount },
513 { "bounce_recipient", vtype_stringptr, &bounce_recipient },
514 { "bounce_return_size_limit", vtype_int, &bounce_return_size_limit },
515 { "caller_gid", vtype_gid, &real_gid },
516 { "caller_uid", vtype_uid, &real_uid },
517 { "callout_address", vtype_stringptr, &callout_address },
518 { "compile_date", vtype_stringptr, &version_date },
519 { "compile_number", vtype_stringptr, &version_cnumber },
520 { "config_dir", vtype_stringptr, &config_main_directory },
521 { "config_file", vtype_stringptr, &config_main_filename },
522 { "csa_status", vtype_stringptr, &csa_status },
523 #ifdef EXPERIMENTAL_DCC
524 { "dcc_header", vtype_stringptr, &dcc_header },
525 { "dcc_result", vtype_stringptr, &dcc_result },
526 #endif
527 #ifndef DISABLE_DKIM
528 { "dkim_algo", vtype_dkim, (void *)DKIM_ALGO },
529 { "dkim_bodylength", vtype_dkim, (void *)DKIM_BODYLENGTH },
530 { "dkim_canon_body", vtype_dkim, (void *)DKIM_CANON_BODY },
531 { "dkim_canon_headers", vtype_dkim, (void *)DKIM_CANON_HEADERS },
532 { "dkim_copiedheaders", vtype_dkim, (void *)DKIM_COPIEDHEADERS },
533 { "dkim_created", vtype_dkim, (void *)DKIM_CREATED },
534 { "dkim_cur_signer", vtype_stringptr, &dkim_cur_signer },
535 { "dkim_domain", vtype_stringptr, &dkim_signing_domain },
536 { "dkim_expires", vtype_dkim, (void *)DKIM_EXPIRES },
537 { "dkim_headernames", vtype_dkim, (void *)DKIM_HEADERNAMES },
538 { "dkim_identity", vtype_dkim, (void *)DKIM_IDENTITY },
539 { "dkim_key_granularity",vtype_dkim, (void *)DKIM_KEY_GRANULARITY },
540 { "dkim_key_length", vtype_int, &dkim_key_length },
541 { "dkim_key_nosubdomains",vtype_dkim, (void *)DKIM_NOSUBDOMAINS },
542 { "dkim_key_notes", vtype_dkim, (void *)DKIM_KEY_NOTES },
543 { "dkim_key_srvtype", vtype_dkim, (void *)DKIM_KEY_SRVTYPE },
544 { "dkim_key_testing", vtype_dkim, (void *)DKIM_KEY_TESTING },
545 { "dkim_selector", vtype_stringptr, &dkim_signing_selector },
546 { "dkim_signers", vtype_stringptr, &dkim_signers },
547 { "dkim_verify_reason", vtype_stringptr, &dkim_verify_reason },
548 { "dkim_verify_status", vtype_stringptr, &dkim_verify_status },
549 #endif
550 #ifdef SUPPORT_DMARC
551 { "dmarc_domain_policy", vtype_stringptr, &dmarc_domain_policy },
552 { "dmarc_status", vtype_stringptr, &dmarc_status },
553 { "dmarc_status_text", vtype_stringptr, &dmarc_status_text },
554 { "dmarc_used_domain", vtype_stringptr, &dmarc_used_domain },
555 #endif
556 { "dnslist_domain", vtype_stringptr, &dnslist_domain },
557 { "dnslist_matched", vtype_stringptr, &dnslist_matched },
558 { "dnslist_text", vtype_stringptr, &dnslist_text },
559 { "dnslist_value", vtype_stringptr, &dnslist_value },
560 { "domain", vtype_stringptr, &deliver_domain },
561 { "domain_data", vtype_stringptr, &deliver_domain_data },
562 #ifndef DISABLE_EVENT
563 { "event_data", vtype_stringptr, &event_data },
564
565 /*XXX want to use generic vars for as many of these as possible*/
566 { "event_defer_errno", vtype_int, &event_defer_errno },
567
568 { "event_name", vtype_stringptr, &event_name },
569 #endif
570 { "exim_gid", vtype_gid, &exim_gid },
571 { "exim_path", vtype_stringptr, &exim_path },
572 { "exim_uid", vtype_uid, &exim_uid },
573 { "exim_version", vtype_stringptr, &version_string },
574 { "headers_added", vtype_string_func, (void *) &fn_hdrs_added },
575 { "home", vtype_stringptr, &deliver_home },
576 { "host", vtype_stringptr, &deliver_host },
577 { "host_address", vtype_stringptr, &deliver_host_address },
578 { "host_data", vtype_stringptr, &host_data },
579 { "host_lookup_deferred",vtype_int, &host_lookup_deferred },
580 { "host_lookup_failed", vtype_int, &host_lookup_failed },
581 { "host_port", vtype_int, &deliver_host_port },
582 { "initial_cwd", vtype_stringptr, &initial_cwd },
583 { "inode", vtype_ino, &deliver_inode },
584 { "interface_address", vtype_stringptr, &interface_address },
585 { "interface_port", vtype_int, &interface_port },
586 { "item", vtype_stringptr, &iterate_item },
587 #ifdef LOOKUP_LDAP
588 { "ldap_dn", vtype_stringptr, &eldap_dn },
589 #endif
590 { "load_average", vtype_load_avg, NULL },
591 { "local_part", vtype_stringptr, &deliver_localpart },
592 { "local_part_data", vtype_stringptr, &deliver_localpart_data },
593 { "local_part_prefix", vtype_stringptr, &deliver_localpart_prefix },
594 { "local_part_prefix_v", vtype_stringptr, &deliver_localpart_prefix_v },
595 { "local_part_suffix", vtype_stringptr, &deliver_localpart_suffix },
596 { "local_part_suffix_v", vtype_stringptr, &deliver_localpart_suffix_v },
597 { "local_part_verified", vtype_stringptr, &deliver_localpart_verified },
598 #ifdef HAVE_LOCAL_SCAN
599 { "local_scan_data", vtype_stringptr, &local_scan_data },
600 #endif
601 { "local_user_gid", vtype_gid, &local_user_gid },
602 { "local_user_uid", vtype_uid, &local_user_uid },
603 { "localhost_number", vtype_int, &host_number },
604 { "log_inodes", vtype_pinodes, (void *)FALSE },
605 { "log_space", vtype_pspace, (void *)FALSE },
606 { "lookup_dnssec_authenticated",vtype_stringptr,&lookup_dnssec_authenticated},
607 { "mailstore_basename", vtype_stringptr, &mailstore_basename },
608 #ifdef WITH_CONTENT_SCAN
609 { "malware_name", vtype_stringptr, &malware_name },
610 #endif
611 { "max_received_linelength", vtype_int, &max_received_linelength },
612 { "message_age", vtype_int, &message_age },
613 { "message_body", vtype_msgbody, &message_body },
614 { "message_body_end", vtype_msgbody_end, &message_body_end },
615 { "message_body_size", vtype_int, &message_body_size },
616 { "message_exim_id", vtype_stringptr, &message_id },
617 { "message_headers", vtype_msgheaders, NULL },
618 { "message_headers_raw", vtype_msgheaders_raw, NULL },
619 { "message_id", vtype_stringptr, &message_id },
620 { "message_linecount", vtype_int, &message_linecount },
621 { "message_size", vtype_int, &message_size },
622 #ifdef SUPPORT_I18N
623 { "message_smtputf8", vtype_bool, &message_smtputf8 },
624 #endif
625 #ifdef WITH_CONTENT_SCAN
626 { "mime_anomaly_level", vtype_int, &mime_anomaly_level },
627 { "mime_anomaly_text", vtype_stringptr, &mime_anomaly_text },
628 { "mime_boundary", vtype_stringptr, &mime_boundary },
629 { "mime_charset", vtype_stringptr, &mime_charset },
630 { "mime_content_description", vtype_stringptr, &mime_content_description },
631 { "mime_content_disposition", vtype_stringptr, &mime_content_disposition },
632 { "mime_content_id", vtype_stringptr, &mime_content_id },
633 { "mime_content_size", vtype_int, &mime_content_size },
634 { "mime_content_transfer_encoding",vtype_stringptr, &mime_content_transfer_encoding },
635 { "mime_content_type", vtype_stringptr, &mime_content_type },
636 { "mime_decoded_filename", vtype_stringptr, &mime_decoded_filename },
637 { "mime_filename", vtype_stringptr, &mime_filename },
638 { "mime_is_coverletter", vtype_int, &mime_is_coverletter },
639 { "mime_is_multipart", vtype_int, &mime_is_multipart },
640 { "mime_is_rfc822", vtype_int, &mime_is_rfc822 },
641 { "mime_part_count", vtype_int, &mime_part_count },
642 #endif
643 { "n0", vtype_filter_int, &filter_n[0] },
644 { "n1", vtype_filter_int, &filter_n[1] },
645 { "n2", vtype_filter_int, &filter_n[2] },
646 { "n3", vtype_filter_int, &filter_n[3] },
647 { "n4", vtype_filter_int, &filter_n[4] },
648 { "n5", vtype_filter_int, &filter_n[5] },
649 { "n6", vtype_filter_int, &filter_n[6] },
650 { "n7", vtype_filter_int, &filter_n[7] },
651 { "n8", vtype_filter_int, &filter_n[8] },
652 { "n9", vtype_filter_int, &filter_n[9] },
653 { "original_domain", vtype_stringptr, &deliver_domain_orig },
654 { "original_local_part", vtype_stringptr, &deliver_localpart_orig },
655 { "originator_gid", vtype_gid, &originator_gid },
656 { "originator_uid", vtype_uid, &originator_uid },
657 { "parent_domain", vtype_stringptr, &deliver_domain_parent },
658 { "parent_local_part", vtype_stringptr, &deliver_localpart_parent },
659 { "pid", vtype_pid, NULL },
660 #ifndef DISABLE_PRDR
661 { "prdr_requested", vtype_bool, &prdr_requested },
662 #endif
663 { "primary_hostname", vtype_stringptr, &primary_hostname },
664 #if defined(SUPPORT_PROXY) || defined(SUPPORT_SOCKS)
665 { "proxy_external_address",vtype_stringptr, &proxy_external_address },
666 { "proxy_external_port", vtype_int, &proxy_external_port },
667 { "proxy_local_address", vtype_stringptr, &proxy_local_address },
668 { "proxy_local_port", vtype_int, &proxy_local_port },
669 { "proxy_session", vtype_bool, &proxy_session },
670 #endif
671 { "prvscheck_address", vtype_stringptr, &prvscheck_address },
672 { "prvscheck_keynum", vtype_stringptr, &prvscheck_keynum },
673 { "prvscheck_result", vtype_stringptr, &prvscheck_result },
674 { "qualify_domain", vtype_stringptr, &qualify_domain_sender },
675 { "qualify_recipient", vtype_stringptr, &qualify_domain_recipient },
676 { "queue_name", vtype_stringptr, &queue_name },
677 { "queue_size", vtype_string_func, &fn_queue_size },
678 { "rcpt_count", vtype_int, &rcpt_count },
679 { "rcpt_defer_count", vtype_int, &rcpt_defer_count },
680 { "rcpt_fail_count", vtype_int, &rcpt_fail_count },
681 { "received_count", vtype_int, &received_count },
682 { "received_for", vtype_stringptr, &received_for },
683 { "received_ip_address", vtype_stringptr, &interface_address },
684 { "received_port", vtype_int, &interface_port },
685 { "received_protocol", vtype_stringptr, &received_protocol },
686 { "received_time", vtype_int, &received_time.tv_sec },
687 { "recipient_data", vtype_stringptr, &recipient_data },
688 { "recipient_verify_failure",vtype_stringptr,&recipient_verify_failure },
689 { "recipients", vtype_string_func, (void *) &fn_recipients },
690 { "recipients_count", vtype_int, &recipients_count },
691 #ifdef WITH_CONTENT_SCAN
692 { "regex_match_string", vtype_stringptr, &regex_match_string },
693 #endif
694 { "reply_address", vtype_reply, NULL },
695 { "return_path", vtype_stringptr, &return_path },
696 { "return_size_limit", vtype_int, &bounce_return_size_limit },
697 { "router_name", vtype_stringptr, &router_name },
698 { "runrc", vtype_int, &runrc },
699 { "self_hostname", vtype_stringptr, &self_hostname },
700 { "sender_address", vtype_stringptr, &sender_address },
701 { "sender_address_data", vtype_stringptr, &sender_address_data },
702 { "sender_address_domain", vtype_domain, &sender_address },
703 { "sender_address_local_part", vtype_localpart, &sender_address },
704 { "sender_data", vtype_stringptr, &sender_data },
705 { "sender_fullhost", vtype_stringptr, &sender_fullhost },
706 { "sender_helo_dnssec", vtype_bool, &sender_helo_dnssec },
707 { "sender_helo_name", vtype_stringptr, &sender_helo_name },
708 { "sender_host_address", vtype_stringptr, &sender_host_address },
709 { "sender_host_authenticated",vtype_stringptr, &sender_host_authenticated },
710 { "sender_host_dnssec", vtype_bool, &sender_host_dnssec },
711 { "sender_host_name", vtype_host_lookup, NULL },
712 { "sender_host_port", vtype_int, &sender_host_port },
713 { "sender_ident", vtype_stringptr, &sender_ident },
714 { "sender_rate", vtype_stringptr, &sender_rate },
715 { "sender_rate_limit", vtype_stringptr, &sender_rate_limit },
716 { "sender_rate_period", vtype_stringptr, &sender_rate_period },
717 { "sender_rcvhost", vtype_stringptr, &sender_rcvhost },
718 { "sender_verify_failure",vtype_stringptr, &sender_verify_failure },
719 { "sending_ip_address", vtype_stringptr, &sending_ip_address },
720 { "sending_port", vtype_int, &sending_port },
721 { "smtp_active_hostname", vtype_stringptr, &smtp_active_hostname },
722 { "smtp_command", vtype_stringptr, &smtp_cmd_buffer },
723 { "smtp_command_argument", vtype_stringptr, &smtp_cmd_argument },
724 { "smtp_command_history", vtype_string_func, (void *) &smtp_cmd_hist },
725 { "smtp_count_at_connection_start", vtype_int, &smtp_accept_count },
726 { "smtp_notquit_reason", vtype_stringptr, &smtp_notquit_reason },
727 { "sn0", vtype_filter_int, &filter_sn[0] },
728 { "sn1", vtype_filter_int, &filter_sn[1] },
729 { "sn2", vtype_filter_int, &filter_sn[2] },
730 { "sn3", vtype_filter_int, &filter_sn[3] },
731 { "sn4", vtype_filter_int, &filter_sn[4] },
732 { "sn5", vtype_filter_int, &filter_sn[5] },
733 { "sn6", vtype_filter_int, &filter_sn[6] },
734 { "sn7", vtype_filter_int, &filter_sn[7] },
735 { "sn8", vtype_filter_int, &filter_sn[8] },
736 { "sn9", vtype_filter_int, &filter_sn[9] },
737 #ifdef WITH_CONTENT_SCAN
738 { "spam_action", vtype_stringptr, &spam_action },
739 { "spam_bar", vtype_stringptr, &spam_bar },
740 { "spam_report", vtype_stringptr, &spam_report },
741 { "spam_score", vtype_stringptr, &spam_score },
742 { "spam_score_int", vtype_stringptr, &spam_score_int },
743 #endif
744 #ifdef SUPPORT_SPF
745 { "spf_guess", vtype_stringptr, &spf_guess },
746 { "spf_header_comment", vtype_stringptr, &spf_header_comment },
747 { "spf_received", vtype_stringptr, &spf_received },
748 { "spf_result", vtype_stringptr, &spf_result },
749 { "spf_result_guessed", vtype_bool, &spf_result_guessed },
750 { "spf_smtp_comment", vtype_stringptr, &spf_smtp_comment },
751 #endif
752 { "spool_directory", vtype_stringptr, &spool_directory },
753 { "spool_inodes", vtype_pinodes, (void *)TRUE },
754 { "spool_space", vtype_pspace, (void *)TRUE },
755 #ifdef EXPERIMENTAL_SRS
756 { "srs_db_address", vtype_stringptr, &srs_db_address },
757 { "srs_db_key", vtype_stringptr, &srs_db_key },
758 { "srs_orig_recipient", vtype_stringptr, &srs_orig_recipient },
759 { "srs_orig_sender", vtype_stringptr, &srs_orig_sender },
760 #endif
761 #if defined(EXPERIMENTAL_SRS) || defined(EXPERIMENTAL_SRS_NATIVE)
762 { "srs_recipient", vtype_stringptr, &srs_recipient },
763 #endif
764 #ifdef EXPERIMENTAL_SRS
765 { "srs_status", vtype_stringptr, &srs_status },
766 #endif
767 { "thisaddress", vtype_stringptr, &filter_thisaddress },
768
769 /* The non-(in,out) variables are now deprecated */
770 { "tls_bits", vtype_int, &tls_in.bits },
771 { "tls_certificate_verified", vtype_int, &tls_in.certificate_verified },
772 { "tls_cipher", vtype_stringptr, &tls_in.cipher },
773
774 { "tls_in_bits", vtype_int, &tls_in.bits },
775 { "tls_in_certificate_verified", vtype_int, &tls_in.certificate_verified },
776 { "tls_in_cipher", vtype_stringptr, &tls_in.cipher },
777 { "tls_in_cipher_std", vtype_stringptr, &tls_in.cipher_stdname },
778 { "tls_in_ocsp", vtype_int, &tls_in.ocsp },
779 { "tls_in_ourcert", vtype_cert, &tls_in.ourcert },
780 { "tls_in_peercert", vtype_cert, &tls_in.peercert },
781 { "tls_in_peerdn", vtype_stringptr, &tls_in.peerdn },
782 #ifdef EXPERIMENTAL_TLS_RESUME
783 { "tls_in_resumption", vtype_int, &tls_in.resumption },
784 #endif
785 #ifndef DISABLE_TLS
786 { "tls_in_sni", vtype_stringptr, &tls_in.sni },
787 #endif
788 { "tls_in_ver", vtype_stringptr, &tls_in.ver },
789 { "tls_out_bits", vtype_int, &tls_out.bits },
790 { "tls_out_certificate_verified", vtype_int,&tls_out.certificate_verified },
791 { "tls_out_cipher", vtype_stringptr, &tls_out.cipher },
792 { "tls_out_cipher_std", vtype_stringptr, &tls_out.cipher_stdname },
793 #ifdef SUPPORT_DANE
794 { "tls_out_dane", vtype_bool, &tls_out.dane_verified },
795 #endif
796 { "tls_out_ocsp", vtype_int, &tls_out.ocsp },
797 { "tls_out_ourcert", vtype_cert, &tls_out.ourcert },
798 { "tls_out_peercert", vtype_cert, &tls_out.peercert },
799 { "tls_out_peerdn", vtype_stringptr, &tls_out.peerdn },
800 #ifdef EXPERIMENTAL_TLS_RESUME
801 { "tls_out_resumption", vtype_int, &tls_out.resumption },
802 #endif
803 #ifndef DISABLE_TLS
804 { "tls_out_sni", vtype_stringptr, &tls_out.sni },
805 #endif
806 #ifdef SUPPORT_DANE
807 { "tls_out_tlsa_usage", vtype_int, &tls_out.tlsa_usage },
808 #endif
809 { "tls_out_ver", vtype_stringptr, &tls_out.ver },
810
811 { "tls_peerdn", vtype_stringptr, &tls_in.peerdn }, /* mind the alphabetical order! */
812 #ifndef DISABLE_TLS
813 { "tls_sni", vtype_stringptr, &tls_in.sni }, /* mind the alphabetical order! */
814 #endif
815
816 { "tod_bsdinbox", vtype_todbsdin, NULL },
817 { "tod_epoch", vtype_tode, NULL },
818 { "tod_epoch_l", vtype_todel, NULL },
819 { "tod_full", vtype_todf, NULL },
820 { "tod_log", vtype_todl, NULL },
821 { "tod_logfile", vtype_todlf, NULL },
822 { "tod_zone", vtype_todzone, NULL },
823 { "tod_zulu", vtype_todzulu, NULL },
824 { "transport_name", vtype_stringptr, &transport_name },
825 { "value", vtype_stringptr, &lookup_value },
826 { "verify_mode", vtype_stringptr, &verify_mode },
827 { "version_number", vtype_stringptr, &version_string },
828 { "warn_message_delay", vtype_stringptr, &warnmsg_delay },
829 { "warn_message_recipient",vtype_stringptr, &warnmsg_recipients },
830 { "warn_message_recipients",vtype_stringptr,&warnmsg_recipients },
831 { "warnmsg_delay", vtype_stringptr, &warnmsg_delay },
832 { "warnmsg_recipient", vtype_stringptr, &warnmsg_recipients },
833 { "warnmsg_recipients", vtype_stringptr, &warnmsg_recipients }
834 };
835
836 static int var_table_size = nelem(var_table);
837 static uschar var_buffer[256];
838 static BOOL malformed_header;
839
840 /* For textual hashes */
841
842 static const char *hashcodes = "abcdefghijklmnopqrtsuvwxyz"
843 "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
844 "0123456789";
845
846 enum { HMAC_MD5, HMAC_SHA1 };
847
848 /* For numeric hashes */
849
850 static unsigned int prime[] = {
851 2, 3, 5, 7, 11, 13, 17, 19, 23, 29,
852 31, 37, 41, 43, 47, 53, 59, 61, 67, 71,
853 73, 79, 83, 89, 97, 101, 103, 107, 109, 113};
854
855 /* For printing modes in symbolic form */
856
857 static uschar *mtable_normal[] =
858 { US"---", US"--x", US"-w-", US"-wx", US"r--", US"r-x", US"rw-", US"rwx" };
859
860 static uschar *mtable_setid[] =
861 { US"--S", US"--s", US"-wS", US"-ws", US"r-S", US"r-s", US"rwS", US"rws" };
862
863 static uschar *mtable_sticky[] =
864 { US"--T", US"--t", US"-wT", US"-wt", US"r-T", US"r-t", US"rwT", US"rwt" };
865
866 /* flags for find_header() */
867 #define FH_EXISTS_ONLY BIT(0)
868 #define FH_WANT_RAW BIT(1)
869 #define FH_WANT_LIST BIT(2)
870
871
872 /*************************************************
873 * Tables for UTF-8 support *
874 *************************************************/
875
876 /* Table of the number of extra characters, indexed by the first character
877 masked with 0x3f. The highest number for a valid UTF-8 character is in fact
878 0x3d. */
879
880 static uschar utf8_table1[] = {
881 1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,
882 1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,
883 2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,
884 3,3,3,3,3,3,3,3,4,4,4,4,5,5,5,5 };
885
886 /* These are the masks for the data bits in the first byte of a character,
887 indexed by the number of additional bytes. */
888
889 static int utf8_table2[] = { 0xff, 0x1f, 0x0f, 0x07, 0x03, 0x01};
890
891 /* Get the next UTF-8 character, advancing the pointer. */
892
893 #define GETUTF8INC(c, ptr) \
894 c = *ptr++; \
895 if ((c & 0xc0) == 0xc0) \
896 { \
897 int a = utf8_table1[c & 0x3f]; /* Number of additional bytes */ \
898 int s = 6*a; \
899 c = (c & utf8_table2[a]) << s; \
900 while (a-- > 0) \
901 { \
902 s -= 6; \
903 c |= (*ptr++ & 0x3f) << s; \
904 } \
905 }
906
907
908
909 static uschar * base32_chars = US"abcdefghijklmnopqrstuvwxyz234567";
910
911 /*************************************************
912 * Binary chop search on a table *
913 *************************************************/
914
915 /* This is used for matching expansion items and operators.
916
917 Arguments:
918 name the name that is being sought
919 table the table to search
920 table_size the number of items in the table
921
922 Returns: the offset in the table, or -1
923 */
924
925 static int
926 chop_match(uschar *name, uschar **table, int table_size)
927 {
928 uschar **bot = table;
929 uschar **top = table + table_size;
930
931 while (top > bot)
932 {
933 uschar **mid = bot + (top - bot)/2;
934 int c = Ustrcmp(name, *mid);
935 if (c == 0) return mid - table;
936 if (c > 0) bot = mid + 1; else top = mid;
937 }
938
939 return -1;
940 }
941
942
943
944 /*************************************************
945 * Check a condition string *
946 *************************************************/
947
948 /* This function is called to expand a string, and test the result for a "true"
949 or "false" value. Failure of the expansion yields FALSE; logged unless it was a
950 forced fail or lookup defer.
951
952 We used to release all store used, but this is not not safe due
953 to ${dlfunc } and ${acl }. In any case expand_string_internal()
954 is reasonably careful to release what it can.
955
956 The actual false-value tests should be replicated for ECOND_BOOL_LAX.
957
958 Arguments:
959 condition the condition string
960 m1 text to be incorporated in panic error
961 m2 ditto
962
963 Returns: TRUE if condition is met, FALSE if not
964 */
965
966 BOOL
967 expand_check_condition(uschar *condition, uschar *m1, uschar *m2)
968 {
969 uschar * ss = expand_string(condition);
970 if (!ss)
971 {
972 if (!f.expand_string_forcedfail && !f.search_find_defer)
973 log_write(0, LOG_MAIN|LOG_PANIC, "failed to expand condition \"%s\" "
974 "for %s %s: %s", condition, m1, m2, expand_string_message);
975 return FALSE;
976 }
977 return *ss && Ustrcmp(ss, "0") != 0 && strcmpic(ss, US"no") != 0 &&
978 strcmpic(ss, US"false") != 0;
979 }
980
981
982
983
984 /*************************************************
985 * Pseudo-random number generation *
986 *************************************************/
987
988 /* Pseudo-random number generation. The result is not "expected" to be
989 cryptographically strong but not so weak that someone will shoot themselves
990 in the foot using it as a nonce in some email header scheme or whatever
991 weirdness they'll twist this into. The result should ideally handle fork().
992
993 However, if we're stuck unable to provide this, then we'll fall back to
994 appallingly bad randomness.
995
996 If DISABLE_TLS is not defined then this will not be used except as an emergency
997 fallback.
998
999 Arguments:
1000 max range maximum
1001 Returns a random number in range [0, max-1]
1002 */
1003
1004 #ifndef DISABLE_TLS
1005 # define vaguely_random_number vaguely_random_number_fallback
1006 #endif
1007 int
1008 vaguely_random_number(int max)
1009 {
1010 #ifndef DISABLE_TLS
1011 # undef vaguely_random_number
1012 #endif
1013 static pid_t pid = 0;
1014 pid_t p2;
1015
1016 if ((p2 = getpid()) != pid)
1017 {
1018 if (pid != 0)
1019 {
1020
1021 #ifdef HAVE_ARC4RANDOM
1022 /* cryptographically strong randomness, common on *BSD platforms, not
1023 so much elsewhere. Alas. */
1024 # ifndef NOT_HAVE_ARC4RANDOM_STIR
1025 arc4random_stir();
1026 # endif
1027 #elif defined(HAVE_SRANDOM) || defined(HAVE_SRANDOMDEV)
1028 # ifdef HAVE_SRANDOMDEV
1029 /* uses random(4) for seeding */
1030 srandomdev();
1031 # else
1032 {
1033 struct timeval tv;
1034 gettimeofday(&tv, NULL);
1035 srandom(tv.tv_sec | tv.tv_usec | getpid());
1036 }
1037 # endif
1038 #else
1039 /* Poor randomness and no seeding here */
1040 #endif
1041
1042 }
1043 pid = p2;
1044 }
1045
1046 #ifdef HAVE_ARC4RANDOM
1047 return arc4random() % max;
1048 #elif defined(HAVE_SRANDOM) || defined(HAVE_SRANDOMDEV)
1049 return random() % max;
1050 #else
1051 /* This one returns a 16-bit number, definitely not crypto-strong */
1052 return random_number(max);
1053 #endif
1054 }
1055
1056
1057
1058
1059 /*************************************************
1060 * Pick out a name from a string *
1061 *************************************************/
1062
1063 /* If the name is too long, it is silently truncated.
1064
1065 Arguments:
1066 name points to a buffer into which to put the name
1067 max is the length of the buffer
1068 s points to the first alphabetic character of the name
1069 extras chars other than alphanumerics to permit
1070
1071 Returns: pointer to the first character after the name
1072
1073 Note: The test for *s != 0 in the while loop is necessary because
1074 Ustrchr() yields non-NULL if the character is zero (which is not something
1075 I expected). */
1076
1077 static const uschar *
1078 read_name(uschar *name, int max, const uschar *s, uschar *extras)
1079 {
1080 int ptr = 0;
1081 while (*s && (isalnum(*s) || Ustrchr(extras, *s) != NULL))
1082 {
1083 if (ptr < max-1) name[ptr++] = *s;
1084 s++;
1085 }
1086 name[ptr] = 0;
1087 return s;
1088 }
1089
1090
1091
1092 /*************************************************
1093 * Pick out the rest of a header name *
1094 *************************************************/
1095
1096 /* A variable name starting $header_ (or just $h_ for those who like
1097 abbreviations) might not be the complete header name because headers can
1098 contain any printing characters in their names, except ':'. This function is
1099 called to read the rest of the name, chop h[eader]_ off the front, and put ':'
1100 on the end, if the name was terminated by white space.
1101
1102 Arguments:
1103 name points to a buffer in which the name read so far exists
1104 max is the length of the buffer
1105 s points to the first character after the name so far, i.e. the
1106 first non-alphameric character after $header_xxxxx
1107
1108 Returns: a pointer to the first character after the header name
1109 */
1110
1111 static const uschar *
1112 read_header_name(uschar *name, int max, const uschar *s)
1113 {
1114 int prelen = Ustrchr(name, '_') - name + 1;
1115 int ptr = Ustrlen(name) - prelen;
1116 if (ptr > 0) memmove(name, name+prelen, ptr);
1117 while (mac_isgraph(*s) && *s != ':')
1118 {
1119 if (ptr < max-1) name[ptr++] = *s;
1120 s++;
1121 }
1122 if (*s == ':') s++;
1123 name[ptr++] = ':';
1124 name[ptr] = 0;
1125 return s;
1126 }
1127
1128
1129
1130 /*************************************************
1131 * Pick out a number from a string *
1132 *************************************************/
1133
1134 /* Arguments:
1135 n points to an integer into which to put the number
1136 s points to the first digit of the number
1137
1138 Returns: a pointer to the character after the last digit
1139 */
1140 /*XXX consider expanding to int_eximarith_t. But the test for
1141 "overbig numbers" in 0002 still needs to overflow it. */
1142
1143 static uschar *
1144 read_number(int *n, uschar *s)
1145 {
1146 *n = 0;
1147 while (isdigit(*s)) *n = *n * 10 + (*s++ - '0');
1148 return s;
1149 }
1150
1151 static const uschar *
1152 read_cnumber(int *n, const uschar *s)
1153 {
1154 *n = 0;
1155 while (isdigit(*s)) *n = *n * 10 + (*s++ - '0');
1156 return s;
1157 }
1158
1159
1160
1161 /*************************************************
1162 * Extract keyed subfield from a string *
1163 *************************************************/
1164
1165 /* The yield is in dynamic store; NULL means that the key was not found.
1166
1167 Arguments:
1168 key points to the name of the key
1169 s points to the string from which to extract the subfield
1170
1171 Returns: NULL if the subfield was not found, or
1172 a pointer to the subfield's data
1173 */
1174
1175 static uschar *
1176 expand_getkeyed(uschar * key, const uschar * s)
1177 {
1178 int length = Ustrlen(key);
1179 Uskip_whitespace(&s);
1180
1181 /* Loop to search for the key */
1182
1183 while (*s)
1184 {
1185 int dkeylength;
1186 uschar * data;
1187 const uschar * dkey = s;
1188
1189 while (*s && *s != '=' && !isspace(*s)) s++;
1190 dkeylength = s - dkey;
1191 if (Uskip_whitespace(&s) == '=') while (isspace((*(++s))));
1192
1193 data = string_dequote(&s);
1194 if (length == dkeylength && strncmpic(key, dkey, length) == 0)
1195 return data;
1196
1197 Uskip_whitespace(&s);
1198 }
1199
1200 return NULL;
1201 }
1202
1203
1204
1205 static var_entry *
1206 find_var_ent(uschar * name)
1207 {
1208 int first = 0;
1209 int last = var_table_size;
1210
1211 while (last > first)
1212 {
1213 int middle = (first + last)/2;
1214 int c = Ustrcmp(name, var_table[middle].name);
1215
1216 if (c > 0) { first = middle + 1; continue; }
1217 if (c < 0) { last = middle; continue; }
1218 return &var_table[middle];
1219 }
1220 return NULL;
1221 }
1222
1223 /*************************************************
1224 * Extract numbered subfield from string *
1225 *************************************************/
1226
1227 /* Extracts a numbered field from a string that is divided by tokens - for
1228 example a line from /etc/passwd is divided by colon characters. First field is
1229 numbered one. Negative arguments count from the right. Zero returns the whole
1230 string. Returns NULL if there are insufficient tokens in the string
1231
1232 ***WARNING***
1233 Modifies final argument - this is a dynamically generated string, so that's OK.
1234
1235 Arguments:
1236 field number of field to be extracted,
1237 first field = 1, whole string = 0, last field = -1
1238 separators characters that are used to break string into tokens
1239 s points to the string from which to extract the subfield
1240
1241 Returns: NULL if the field was not found,
1242 a pointer to the field's data inside s (modified to add 0)
1243 */
1244
1245 static uschar *
1246 expand_gettokened (int field, uschar *separators, uschar *s)
1247 {
1248 int sep = 1;
1249 int count;
1250 uschar *ss = s;
1251 uschar *fieldtext = NULL;
1252
1253 if (field == 0) return s;
1254
1255 /* Break the line up into fields in place; for field > 0 we stop when we have
1256 done the number of fields we want. For field < 0 we continue till the end of
1257 the string, counting the number of fields. */
1258
1259 count = (field > 0)? field : INT_MAX;
1260
1261 while (count-- > 0)
1262 {
1263 size_t len;
1264
1265 /* Previous field was the last one in the string. For a positive field
1266 number, this means there are not enough fields. For a negative field number,
1267 check that there are enough, and scan back to find the one that is wanted. */
1268
1269 if (sep == 0)
1270 {
1271 if (field > 0 || (-field) > (INT_MAX - count - 1)) return NULL;
1272 if ((-field) == (INT_MAX - count - 1)) return s;
1273 while (field++ < 0)
1274 {
1275 ss--;
1276 while (ss[-1] != 0) ss--;
1277 }
1278 fieldtext = ss;
1279 break;
1280 }
1281
1282 /* Previous field was not last in the string; save its start and put a
1283 zero at its end. */
1284
1285 fieldtext = ss;
1286 len = Ustrcspn(ss, separators);
1287 sep = ss[len];
1288 ss[len] = 0;
1289 ss += len + 1;
1290 }
1291
1292 return fieldtext;
1293 }
1294
1295
1296 static uschar *
1297 expand_getlistele(int field, const uschar * list)
1298 {
1299 const uschar * tlist = list;
1300 int sep = 0;
1301 uschar dummy;
1302
1303 if (field < 0)
1304 {
1305 for (field++; string_nextinlist(&tlist, &sep, &dummy, 1); ) field++;
1306 sep = 0;
1307 }
1308 if (field == 0) return NULL;
1309 while (--field > 0 && (string_nextinlist(&list, &sep, &dummy, 1))) ;
1310 return string_nextinlist(&list, &sep, NULL, 0);
1311 }
1312
1313
1314 /* Certificate fields, by name. Worry about by-OID later */
1315 /* Names are chosen to not have common prefixes */
1316
1317 #ifndef DISABLE_TLS
1318 typedef struct
1319 {
1320 uschar * name;
1321 int namelen;
1322 uschar * (*getfn)(void * cert, uschar * mod);
1323 } certfield;
1324 static certfield certfields[] =
1325 { /* linear search; no special order */
1326 { US"version", 7, &tls_cert_version },
1327 { US"serial_number", 13, &tls_cert_serial_number },
1328 { US"subject", 7, &tls_cert_subject },
1329 { US"notbefore", 9, &tls_cert_not_before },
1330 { US"notafter", 8, &tls_cert_not_after },
1331 { US"issuer", 6, &tls_cert_issuer },
1332 { US"signature", 9, &tls_cert_signature },
1333 { US"sig_algorithm", 13, &tls_cert_signature_algorithm },
1334 { US"subj_altname", 12, &tls_cert_subject_altname },
1335 { US"ocsp_uri", 8, &tls_cert_ocsp_uri },
1336 { US"crl_uri", 7, &tls_cert_crl_uri },
1337 };
1338
1339 static uschar *
1340 expand_getcertele(uschar * field, uschar * certvar)
1341 {
1342 var_entry * vp;
1343
1344 if (!(vp = find_var_ent(certvar)))
1345 {
1346 expand_string_message =
1347 string_sprintf("no variable named \"%s\"", certvar);
1348 return NULL; /* Unknown variable name */
1349 }
1350 /* NB this stops us passing certs around in variable. Might
1351 want to do that in future */
1352 if (vp->type != vtype_cert)
1353 {
1354 expand_string_message =
1355 string_sprintf("\"%s\" is not a certificate", certvar);
1356 return NULL; /* Unknown variable name */
1357 }
1358 if (!*(void **)vp->value)
1359 return NULL;
1360
1361 if (*field >= '0' && *field <= '9')
1362 return tls_cert_ext_by_oid(*(void **)vp->value, field, 0);
1363
1364 for (certfield * cp = certfields;
1365 cp < certfields + nelem(certfields);
1366 cp++)
1367 if (Ustrncmp(cp->name, field, cp->namelen) == 0)
1368 {
1369 uschar * modifier = *(field += cp->namelen) == ','
1370 ? ++field : NULL;
1371 return (*cp->getfn)( *(void **)vp->value, modifier );
1372 }
1373
1374 expand_string_message =
1375 string_sprintf("bad field selector \"%s\" for certextract", field);
1376 return NULL;
1377 }
1378 #endif /*DISABLE_TLS*/
1379
1380 /*************************************************
1381 * Extract a substring from a string *
1382 *************************************************/
1383
1384 /* Perform the ${substr or ${length expansion operations.
1385
1386 Arguments:
1387 subject the input string
1388 value1 the offset from the start of the input string to the start of
1389 the output string; if negative, count from the right.
1390 value2 the length of the output string, or negative (-1) for unset
1391 if value1 is positive, unset means "all after"
1392 if value1 is negative, unset means "all before"
1393 len set to the length of the returned string
1394
1395 Returns: pointer to the output string, or NULL if there is an error
1396 */
1397
1398 static uschar *
1399 extract_substr(uschar *subject, int value1, int value2, int *len)
1400 {
1401 int sublen = Ustrlen(subject);
1402
1403 if (value1 < 0) /* count from right */
1404 {
1405 value1 += sublen;
1406
1407 /* If the position is before the start, skip to the start, and adjust the
1408 length. If the length ends up negative, the substring is null because nothing
1409 can precede. This falls out naturally when the length is unset, meaning "all
1410 to the left". */
1411
1412 if (value1 < 0)
1413 {
1414 value2 += value1;
1415 if (value2 < 0) value2 = 0;
1416 value1 = 0;
1417 }
1418
1419 /* Otherwise an unset length => characters before value1 */
1420
1421 else if (value2 < 0)
1422 {
1423 value2 = value1;
1424 value1 = 0;
1425 }
1426 }
1427
1428 /* For a non-negative offset, if the starting position is past the end of the
1429 string, the result will be the null string. Otherwise, an unset length means
1430 "rest"; just set it to the maximum - it will be cut down below if necessary. */
1431
1432 else
1433 {
1434 if (value1 > sublen)
1435 {
1436 value1 = sublen;
1437 value2 = 0;
1438 }
1439 else if (value2 < 0) value2 = sublen;
1440 }
1441
1442 /* Cut the length down to the maximum possible for the offset value, and get
1443 the required characters. */
1444
1445 if (value1 + value2 > sublen) value2 = sublen - value1;
1446 *len = value2;
1447 return subject + value1;
1448 }
1449
1450
1451
1452
1453 /*************************************************
1454 * Old-style hash of a string *
1455 *************************************************/
1456
1457 /* Perform the ${hash expansion operation.
1458
1459 Arguments:
1460 subject the input string (an expanded substring)
1461 value1 the length of the output string; if greater or equal to the
1462 length of the input string, the input string is returned
1463 value2 the number of hash characters to use, or 26 if negative
1464 len set to the length of the returned string
1465
1466 Returns: pointer to the output string, or NULL if there is an error
1467 */
1468
1469 static uschar *
1470 compute_hash(uschar *subject, int value1, int value2, int *len)
1471 {
1472 int sublen = Ustrlen(subject);
1473
1474 if (value2 < 0) value2 = 26;
1475 else if (value2 > Ustrlen(hashcodes))
1476 {
1477 expand_string_message =
1478 string_sprintf("hash count \"%d\" too big", value2);
1479 return NULL;
1480 }
1481
1482 /* Calculate the hash text. We know it is shorter than the original string, so
1483 can safely place it in subject[] (we know that subject is always itself an
1484 expanded substring). */
1485
1486 if (value1 < sublen)
1487 {
1488 int c;
1489 int i = 0;
1490 int j = value1;
1491 while ((c = (subject[j])) != 0)
1492 {
1493 int shift = (c + j++) & 7;
1494 subject[i] ^= (c << shift) | (c >> (8-shift));
1495 if (++i >= value1) i = 0;
1496 }
1497 for (i = 0; i < value1; i++)
1498 subject[i] = hashcodes[(subject[i]) % value2];
1499 }
1500 else value1 = sublen;
1501
1502 *len = value1;
1503 return subject;
1504 }
1505
1506
1507
1508
1509 /*************************************************
1510 * Numeric hash of a string *
1511 *************************************************/
1512
1513 /* Perform the ${nhash expansion operation. The first characters of the
1514 string are treated as most important, and get the highest prime numbers.
1515
1516 Arguments:
1517 subject the input string
1518 value1 the maximum value of the first part of the result
1519 value2 the maximum value of the second part of the result,
1520 or negative to produce only a one-part result
1521 len set to the length of the returned string
1522
1523 Returns: pointer to the output string, or NULL if there is an error.
1524 */
1525
1526 static uschar *
1527 compute_nhash (uschar *subject, int value1, int value2, int *len)
1528 {
1529 uschar *s = subject;
1530 int i = 0;
1531 unsigned long int total = 0; /* no overflow */
1532
1533 while (*s != 0)
1534 {
1535 if (i == 0) i = nelem(prime) - 1;
1536 total += prime[i--] * (unsigned int)(*s++);
1537 }
1538
1539 /* If value2 is unset, just compute one number */
1540
1541 if (value2 < 0)
1542 s = string_sprintf("%lu", total % value1);
1543
1544 /* Otherwise do a div/mod hash */
1545
1546 else
1547 {
1548 total = total % (value1 * value2);
1549 s = string_sprintf("%lu/%lu", total/value2, total % value2);
1550 }
1551
1552 *len = Ustrlen(s);
1553 return s;
1554 }
1555
1556
1557
1558
1559
1560 /*************************************************
1561 * Find the value of a header or headers *
1562 *************************************************/
1563
1564 /* Multiple instances of the same header get concatenated, and this function
1565 can also return a concatenation of all the header lines. When concatenating
1566 specific headers that contain lists of addresses, a comma is inserted between
1567 them. Otherwise we use a straight concatenation. Because some messages can have
1568 pathologically large number of lines, there is a limit on the length that is
1569 returned.
1570
1571 Arguments:
1572 name the name of the header, without the leading $header_ or $h_,
1573 or NULL if a concatenation of all headers is required
1574 newsize return the size of memory block that was obtained; may be NULL
1575 if exists_only is TRUE
1576 flags FH_EXISTS_ONLY
1577 set if called from a def: test; don't need to build a string;
1578 just return a string that is not "" and not "0" if the header
1579 exists
1580 FH_WANT_RAW
1581 set if called for $rh_ or $rheader_ items; no processing,
1582 other than concatenating, will be done on the header. Also used
1583 for $message_headers_raw.
1584 FH_WANT_LIST
1585 Double colon chars in the content, and replace newline with
1586 colon between each element when concatenating; returning a
1587 colon-sep list (elements might contain newlines)
1588 charset name of charset to translate MIME words to; used only if
1589 want_raw is false; if NULL, no translation is done (this is
1590 used for $bh_ and $bheader_)
1591
1592 Returns: NULL if the header does not exist, else a pointer to a new
1593 store block
1594 */
1595
1596 static uschar *
1597 find_header(uschar *name, int *newsize, unsigned flags, uschar *charset)
1598 {
1599 BOOL found = !name;
1600 int len = name ? Ustrlen(name) : 0;
1601 BOOL comma = FALSE;
1602 gstring * g = NULL;
1603
1604 for (header_line * h = header_list; h; h = h->next)
1605 if (h->type != htype_old && h->text) /* NULL => Received: placeholder */
1606 if (!name || (len <= h->slen && strncmpic(name, h->text, len) == 0))
1607 {
1608 uschar * s, * t;
1609 size_t inc;
1610
1611 if (flags & FH_EXISTS_ONLY)
1612 return US"1"; /* don't need actual string */
1613
1614 found = TRUE;
1615 s = h->text + len; /* text to insert */
1616 if (!(flags & FH_WANT_RAW)) /* unless wanted raw, */
1617 while (isspace(*s)) s++; /* remove leading white space */
1618 t = h->text + h->slen; /* end-point */
1619
1620 /* Unless wanted raw, remove trailing whitespace, including the
1621 newline. */
1622
1623 if (flags & FH_WANT_LIST)
1624 while (t > s && t[-1] == '\n') t--;
1625 else if (!(flags & FH_WANT_RAW))
1626 {
1627 while (t > s && isspace(t[-1])) t--;
1628
1629 /* Set comma if handling a single header and it's one of those
1630 that contains an address list, except when asked for raw headers. Only
1631 need to do this once. */
1632
1633 if (name && !comma && Ustrchr("BCFRST", h->type)) comma = TRUE;
1634 }
1635
1636 /* Trim the header roughly if we're approaching limits */
1637 inc = t - s;
1638 if (gstring_length(g) + inc > header_insert_maxlen)
1639 inc = header_insert_maxlen - gstring_length(g);
1640
1641 /* For raw just copy the data; for a list, add the data as a colon-sep
1642 list-element; for comma-list add as an unchecked comma,newline sep
1643 list-elemment; for other nonraw add as an unchecked newline-sep list (we
1644 stripped trailing WS above including the newline). We ignore the potential
1645 expansion due to colon-doubling, just leaving the loop if the limit is met
1646 or exceeded. */
1647
1648 if (flags & FH_WANT_LIST)
1649 g = string_append_listele_n(g, ':', s, (unsigned)inc);
1650 else if (flags & FH_WANT_RAW)
1651 g = string_catn(g, s, (unsigned)inc);
1652 else if (inc > 0)
1653 g = string_append2_listele_n(g, comma ? US",\n" : US"\n",
1654 s, (unsigned)inc);
1655
1656 if (gstring_length(g) >= header_insert_maxlen) break;
1657 }
1658
1659 if (!found) return NULL; /* No header found */
1660 if (!g) return US"";
1661
1662 /* That's all we do for raw header expansion. */
1663
1664 *newsize = g->size;
1665 if (flags & FH_WANT_RAW)
1666 return string_from_gstring(g);
1667
1668 /* Otherwise do RFC 2047 decoding, translating the charset if requested.
1669 The rfc2047_decode2() function can return an error with decoded data if the
1670 charset translation fails. If decoding fails, it returns NULL. */
1671
1672 else
1673 {
1674 uschar * error, * decoded = rfc2047_decode2(string_from_gstring(g),
1675 check_rfc2047_length, charset, '?', NULL, newsize, &error);
1676 if (error)
1677 DEBUG(D_any) debug_printf("*** error in RFC 2047 decoding: %s\n"
1678 " input was: %s\n", error, g->s);
1679 return decoded ? decoded : string_from_gstring(g);
1680 }
1681 }
1682
1683
1684
1685
1686 /* Append a "local" element to an Authentication-Results: header
1687 if this was a non-smtp message.
1688 */
1689
1690 static gstring *
1691 authres_local(gstring * g, const uschar * sysname)
1692 {
1693 if (!f.authentication_local)
1694 return g;
1695 g = string_append(g, 3, US";\n\tlocal=pass (non-smtp, ", sysname, US")");
1696 if (authenticated_id) g = string_append(g, 2, " u=", authenticated_id);
1697 return g;
1698 }
1699
1700
1701 /* Append an "iprev" element to an Authentication-Results: header
1702 if we have attempted to get the calling host's name.
1703 */
1704
1705 static gstring *
1706 authres_iprev(gstring * g)
1707 {
1708 if (sender_host_name)
1709 g = string_append(g, 3, US";\n\tiprev=pass (", sender_host_name, US")");
1710 else if (host_lookup_deferred)
1711 g = string_catn(g, US";\n\tiprev=temperror", 19);
1712 else if (host_lookup_failed)
1713 g = string_catn(g, US";\n\tiprev=fail", 13);
1714 else
1715 return g;
1716
1717 if (sender_host_address)
1718 g = string_append(g, 2, US" smtp.remote-ip=", sender_host_address);
1719 return g;
1720 }
1721
1722
1723
1724 /*************************************************
1725 * Return list of recipients *
1726 *************************************************/
1727 /* A recipients list is available only during system message filtering,
1728 during ACL processing after DATA, and while expanding pipe commands
1729 generated from a system filter, but not elsewhere. */
1730
1731 static uschar *
1732 fn_recipients(void)
1733 {
1734 uschar * s;
1735 gstring * g = NULL;
1736
1737 if (!f.enable_dollar_recipients) return NULL;
1738
1739 for (int i = 0; i < recipients_count; i++)
1740 {
1741 s = recipients_list[i].address;
1742 g = string_append2_listele_n(g, US", ", s, Ustrlen(s));
1743 }
1744 return g ? g->s : NULL;
1745 }
1746
1747
1748 /*************************************************
1749 * Return size of queue *
1750 *************************************************/
1751 /* Ask the daemon for the queue size */
1752
1753 static uschar *
1754 fn_queue_size(void)
1755 {
1756 struct sockaddr_un sa_un = {.sun_family = AF_UNIX};
1757 uschar buf[16];
1758 int fd;
1759 ssize_t len;
1760 const uschar * where;
1761 #ifndef EXIM_HAVE_ABSTRACT_UNIX_SOCKETS
1762 uschar * sname;
1763 #endif
1764 fd_set fds;
1765 struct timeval tv;
1766
1767 if ((fd = socket(AF_UNIX, SOCK_DGRAM, 0)) < 0)
1768 {
1769 DEBUG(D_expand) debug_printf(" socket: %s\n", strerror(errno));
1770 return NULL;
1771 }
1772
1773 #ifdef EXIM_HAVE_ABSTRACT_UNIX_SOCKETS
1774 sa_un.sun_path[0] = 0; /* Abstract local socket addr - Linux-specific? */
1775 len = offsetof(struct sockaddr_un, sun_path) + 1
1776 + snprintf(sa_un.sun_path+1, sizeof(sa_un.sun_path)-1, "exim_%d", getpid());
1777 #else
1778 sname = string_sprintf("%s/p_%d", spool_directory, getpid());
1779 len = offsetof(struct sockaddr_un, sun_path)
1780 + snprintf(sa_un.sun_path, sizeof(sa_un.sun_path), "%s", sname);
1781 #endif
1782
1783 if (bind(fd, (const struct sockaddr *)&sa_un, len) < 0)
1784 { where = US"bind"; goto bad; }
1785
1786 #ifdef notdef
1787 debug_printf("local addr '%s%s'\n",
1788 *sa_un.sun_path ? "" : "@",
1789 sa_un.sun_path + (*sa_un.sun_path ? 0 : 1));
1790 #endif
1791
1792 #ifdef EXIM_HAVE_ABSTRACT_UNIX_SOCKETS
1793 sa_un.sun_path[0] = 0; /* Abstract local socket addr - Linux-specific? */
1794 len = offsetof(struct sockaddr_un, sun_path) + 1
1795 + snprintf(sa_un.sun_path+1, sizeof(sa_un.sun_path)-1, "%s",
1796 expand_string(notifier_socket));
1797 #else
1798 len = offsetof(struct sockaddr_un, sun_path)
1799 + snprintf(sa_un.sun_path, sizeof(sa_un.sun_path), "%s",
1800 expand_string(notifier_socket));
1801 #endif
1802
1803 if (connect(fd, (const struct sockaddr *)&sa_un, len) < 0)
1804 { where = US"connect"; goto bad2; }
1805
1806 buf[0] = NOTIFY_QUEUE_SIZE_REQ;
1807 if (send(fd, buf, 1, 0) < 0) { where = US"send"; goto bad; }
1808
1809 FD_ZERO(&fds); FD_SET(fd, &fds);
1810 tv.tv_sec = 2; tv.tv_usec = 0;
1811 if (select(fd + 1, (SELECT_ARG2_TYPE *)&fds, NULL, NULL, &tv) != 1)
1812 {
1813 DEBUG(D_expand) debug_printf("no daemon response; using local evaluation\n");
1814 len = snprintf(CS buf, sizeof(buf), "%u", queue_count_cached());
1815 }
1816 else if ((len = recv(fd, buf, sizeof(buf), 0)) < 0)
1817 { where = US"recv"; goto bad2; }
1818
1819 close(fd);
1820 #ifndef EXIM_HAVE_ABSTRACT_UNIX_SOCKETS
1821 Uunlink(sname);
1822 #endif
1823 return string_copyn(buf, len);
1824
1825 bad2:
1826 #ifndef EXIM_HAVE_ABSTRACT_UNIX_SOCKETS
1827 Uunlink(sname);
1828 #endif
1829 bad:
1830 close(fd);
1831 DEBUG(D_expand) debug_printf(" %s: %s\n", where, strerror(errno));
1832 return NULL;
1833 }
1834
1835
1836 /*************************************************
1837 * Find value of a variable *
1838 *************************************************/
1839
1840 /* The table of variables is kept in alphabetic order, so we can search it
1841 using a binary chop. The "choplen" variable is nothing to do with the binary
1842 chop.
1843
1844 Arguments:
1845 name the name of the variable being sought
1846 exists_only TRUE if this is a def: test; passed on to find_header()
1847 skipping TRUE => skip any processing evaluation; this is not the same as
1848 exists_only because def: may test for values that are first
1849 evaluated here
1850 newsize pointer to an int which is initially zero; if the answer is in
1851 a new memory buffer, *newsize is set to its size
1852
1853 Returns: NULL if the variable does not exist, or
1854 a pointer to the variable's contents, or
1855 something non-NULL if exists_only is TRUE
1856 */
1857
1858 static uschar *
1859 find_variable(uschar *name, BOOL exists_only, BOOL skipping, int *newsize)
1860 {
1861 var_entry * vp;
1862 uschar *s, *domain;
1863 uschar **ss;
1864 void * val;
1865
1866 /* Handle ACL variables, whose names are of the form acl_cxxx or acl_mxxx.
1867 Originally, xxx had to be a number in the range 0-9 (later 0-19), but from
1868 release 4.64 onwards arbitrary names are permitted, as long as the first 5
1869 characters are acl_c or acl_m and the sixth is either a digit or an underscore
1870 (this gave backwards compatibility at the changeover). There may be built-in
1871 variables whose names start acl_ but they should never start in this way. This
1872 slightly messy specification is a consequence of the history, needless to say.
1873
1874 If an ACL variable does not exist, treat it as empty, unless strict_acl_vars is
1875 set, in which case give an error. */
1876
1877 if ((Ustrncmp(name, "acl_c", 5) == 0 || Ustrncmp(name, "acl_m", 5) == 0) &&
1878 !isalpha(name[5]))
1879 {
1880 tree_node * node =
1881 tree_search(name[4] == 'c' ? acl_var_c : acl_var_m, name + 4);
1882 return node ? node->data.ptr : strict_acl_vars ? NULL : US"";
1883 }
1884 else if (Ustrncmp(name, "r_", 2) == 0)
1885 {
1886 tree_node * node = tree_search(router_var, name + 2);
1887 return node ? node->data.ptr : strict_acl_vars ? NULL : US"";
1888 }
1889
1890 /* Handle $auth<n> variables. */
1891
1892 if (Ustrncmp(name, "auth", 4) == 0)
1893 {
1894 uschar *endptr;
1895 int n = Ustrtoul(name + 4, &endptr, 10);
1896 if (*endptr == 0 && n != 0 && n <= AUTH_VARS)
1897 return !auth_vars[n-1] ? US"" : auth_vars[n-1];
1898 }
1899 else if (Ustrncmp(name, "regex", 5) == 0)
1900 {
1901 uschar *endptr;
1902 int n = Ustrtoul(name + 5, &endptr, 10);
1903 if (*endptr == 0 && n != 0 && n <= REGEX_VARS)
1904 return !regex_vars[n-1] ? US"" : regex_vars[n-1];
1905 }
1906
1907 /* For all other variables, search the table */
1908
1909 if (!(vp = find_var_ent(name)))
1910 return NULL; /* Unknown variable name */
1911
1912 /* Found an existing variable. If in skipping state, the value isn't needed,
1913 and we want to avoid processing (such as looking up the host name). */
1914
1915 if (skipping)
1916 return US"";
1917
1918 val = vp->value;
1919 switch (vp->type)
1920 {
1921 case vtype_filter_int:
1922 if (!f.filter_running) return NULL;
1923 /* Fall through */
1924 /* VVVVVVVVVVVV */
1925 case vtype_int:
1926 sprintf(CS var_buffer, "%d", *(int *)(val)); /* Integer */
1927 return var_buffer;
1928
1929 case vtype_ino:
1930 sprintf(CS var_buffer, "%ld", (long int)(*(ino_t *)(val))); /* Inode */
1931 return var_buffer;
1932
1933 case vtype_gid:
1934 sprintf(CS var_buffer, "%ld", (long int)(*(gid_t *)(val))); /* gid */
1935 return var_buffer;
1936
1937 case vtype_uid:
1938 sprintf(CS var_buffer, "%ld", (long int)(*(uid_t *)(val))); /* uid */
1939 return var_buffer;
1940
1941 case vtype_bool:
1942 sprintf(CS var_buffer, "%s", *(BOOL *)(val) ? "yes" : "no"); /* bool */
1943 return var_buffer;
1944
1945 case vtype_stringptr: /* Pointer to string */
1946 return (s = *((uschar **)(val))) ? s : US"";
1947
1948 case vtype_pid:
1949 sprintf(CS var_buffer, "%d", (int)getpid()); /* pid */
1950 return var_buffer;
1951
1952 case vtype_load_avg:
1953 sprintf(CS var_buffer, "%d", OS_GETLOADAVG()); /* load_average */
1954 return var_buffer;
1955
1956 case vtype_host_lookup: /* Lookup if not done so */
1957 if ( !sender_host_name && sender_host_address
1958 && !host_lookup_failed && host_name_lookup() == OK)
1959 host_build_sender_fullhost();
1960 return sender_host_name ? sender_host_name : US"";
1961
1962 case vtype_localpart: /* Get local part from address */
1963 if (!(s = *((uschar **)(val)))) return US"";
1964 if (!(domain = Ustrrchr(s, '@'))) return s;
1965 if (domain - s > sizeof(var_buffer) - 1)
1966 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "local part longer than " SIZE_T_FMT
1967 " in string expansion", sizeof(var_buffer));
1968 return string_copyn(s, domain - s);
1969
1970 case vtype_domain: /* Get domain from address */
1971 if (!(s = *((uschar **)(val)))) return US"";
1972 domain = Ustrrchr(s, '@');
1973 return domain ? domain + 1 : US"";
1974
1975 case vtype_msgheaders:
1976 return find_header(NULL, newsize, exists_only ? FH_EXISTS_ONLY : 0, NULL);
1977
1978 case vtype_msgheaders_raw:
1979 return find_header(NULL, newsize,
1980 exists_only ? FH_EXISTS_ONLY|FH_WANT_RAW : FH_WANT_RAW, NULL);
1981
1982 case vtype_msgbody: /* Pointer to msgbody string */
1983 case vtype_msgbody_end: /* Ditto, the end of the msg */
1984 ss = (uschar **)(val);
1985 if (!*ss && deliver_datafile >= 0) /* Read body when needed */
1986 {
1987 uschar *body;
1988 off_t start_offset = SPOOL_DATA_START_OFFSET;
1989 int len = message_body_visible;
1990 if (len > message_size) len = message_size;
1991 *ss = body = store_malloc(len+1);
1992 body[0] = 0;
1993 if (vp->type == vtype_msgbody_end)
1994 {
1995 struct stat statbuf;
1996 if (fstat(deliver_datafile, &statbuf) == 0)
1997 {
1998 start_offset = statbuf.st_size - len;
1999 if (start_offset < SPOOL_DATA_START_OFFSET)
2000 start_offset = SPOOL_DATA_START_OFFSET;
2001 }
2002 }
2003 if (lseek(deliver_datafile, start_offset, SEEK_SET) < 0)
2004 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "deliver_datafile lseek: %s",
2005 strerror(errno));
2006 len = read(deliver_datafile, body, len);
2007 if (len > 0)
2008 {
2009 body[len] = 0;
2010 if (message_body_newlines) /* Separate loops for efficiency */
2011 while (len > 0)
2012 { if (body[--len] == 0) body[len] = ' '; }
2013 else
2014 while (len > 0)
2015 { if (body[--len] == '\n' || body[len] == 0) body[len] = ' '; }
2016 }
2017 }
2018 return *ss ? *ss : US"";
2019
2020 case vtype_todbsdin: /* BSD inbox time of day */
2021 return tod_stamp(tod_bsdin);
2022
2023 case vtype_tode: /* Unix epoch time of day */
2024 return tod_stamp(tod_epoch);
2025
2026 case vtype_todel: /* Unix epoch/usec time of day */
2027 return tod_stamp(tod_epoch_l);
2028
2029 case vtype_todf: /* Full time of day */
2030 return tod_stamp(tod_full);
2031
2032 case vtype_todl: /* Log format time of day */
2033 return tod_stamp(tod_log_bare); /* (without timezone) */
2034
2035 case vtype_todzone: /* Time zone offset only */
2036 return tod_stamp(tod_zone);
2037
2038 case vtype_todzulu: /* Zulu time */
2039 return tod_stamp(tod_zulu);
2040
2041 case vtype_todlf: /* Log file datestamp tod */
2042 return tod_stamp(tod_log_datestamp_daily);
2043
2044 case vtype_reply: /* Get reply address */
2045 s = find_header(US"reply-to:", newsize,
2046 exists_only ? FH_EXISTS_ONLY|FH_WANT_RAW : FH_WANT_RAW,
2047 headers_charset);
2048 if (s) Uskip_whitespace(&s);
2049 if (!s || !*s)
2050 {
2051 *newsize = 0; /* For the *s==0 case */
2052 s = find_header(US"from:", newsize,
2053 exists_only ? FH_EXISTS_ONLY|FH_WANT_RAW : FH_WANT_RAW,
2054 headers_charset);
2055 }
2056 if (s)
2057 {
2058 uschar *t;
2059 Uskip_whitespace(&s);
2060 for (t = s; *t; t++) if (*t == '\n') *t = ' ';
2061 while (t > s && isspace(t[-1])) t--;
2062 *t = 0;
2063 }
2064 return s ? s : US"";
2065
2066 case vtype_string_func:
2067 {
2068 stringptr_fn_t * fn = (stringptr_fn_t *) val;
2069 return fn();
2070 }
2071
2072 case vtype_pspace:
2073 {
2074 int inodes;
2075 sprintf(CS var_buffer, PR_EXIM_ARITH,
2076 receive_statvfs(val == (void *)TRUE, &inodes));
2077 }
2078 return var_buffer;
2079
2080 case vtype_pinodes:
2081 {
2082 int inodes;
2083 (void) receive_statvfs(val == (void *)TRUE, &inodes);
2084 sprintf(CS var_buffer, "%d", inodes);
2085 }
2086 return var_buffer;
2087
2088 case vtype_cert:
2089 return *(void **)val ? US"<cert>" : US"";
2090
2091 #ifndef DISABLE_DKIM
2092 case vtype_dkim:
2093 return dkim_exim_expand_query((int)(long)val);
2094 #endif
2095
2096 }
2097
2098 return NULL; /* Unknown variable. Silences static checkers. */
2099 }
2100
2101
2102
2103
2104 void
2105 modify_variable(uschar *name, void * value)
2106 {
2107 var_entry * vp;
2108 if ((vp = find_var_ent(name))) vp->value = value;
2109 return; /* Unknown variable name, fail silently */
2110 }
2111
2112
2113
2114
2115
2116
2117 /*************************************************
2118 * Read and expand substrings *
2119 *************************************************/
2120
2121 /* This function is called to read and expand argument substrings for various
2122 expansion items. Some have a minimum requirement that is less than the maximum;
2123 in these cases, the first non-present one is set to NULL.
2124
2125 Arguments:
2126 sub points to vector of pointers to set
2127 n maximum number of substrings
2128 m minimum required
2129 sptr points to current string pointer
2130 skipping the skipping flag
2131 check_end if TRUE, check for final '}'
2132 name name of item, for error message
2133 resetok if not NULL, pointer to flag - write FALSE if unsafe to reset
2134 the store.
2135
2136 Returns: 0 OK; string pointer updated
2137 1 curly bracketing error (too few arguments)
2138 2 too many arguments (only if check_end is set); message set
2139 3 other error (expansion failure)
2140 */
2141
2142 static int
2143 read_subs(uschar **sub, int n, int m, const uschar **sptr, BOOL skipping,
2144 BOOL check_end, uschar *name, BOOL *resetok)
2145 {
2146 const uschar *s = *sptr;
2147
2148 Uskip_whitespace(&s);
2149 for (int i = 0; i < n; i++)
2150 {
2151 if (*s != '{')
2152 {
2153 if (i < m)
2154 {
2155 expand_string_message = string_sprintf("Not enough arguments for '%s' "
2156 "(min is %d)", name, m);
2157 return 1;
2158 }
2159 sub[i] = NULL;
2160 break;
2161 }
2162 if (!(sub[i] = expand_string_internal(s+1, TRUE, &s, skipping, TRUE, resetok)))
2163 return 3;
2164 if (*s++ != '}') return 1;
2165 Uskip_whitespace(&s);
2166 }
2167 if (check_end && *s++ != '}')
2168 {
2169 if (s[-1] == '{')
2170 {
2171 expand_string_message = string_sprintf("Too many arguments for '%s' "
2172 "(max is %d)", name, n);
2173 return 2;
2174 }
2175 expand_string_message = string_sprintf("missing '}' after '%s'", name);
2176 return 1;
2177 }
2178
2179 *sptr = s;
2180 return 0;
2181 }
2182
2183
2184
2185
2186 /*************************************************
2187 * Elaborate message for bad variable *
2188 *************************************************/
2189
2190 /* For the "unknown variable" message, take a look at the variable's name, and
2191 give additional information about possible ACL variables. The extra information
2192 is added on to expand_string_message.
2193
2194 Argument: the name of the variable
2195 Returns: nothing
2196 */
2197
2198 static void
2199 check_variable_error_message(uschar *name)
2200 {
2201 if (Ustrncmp(name, "acl_", 4) == 0)
2202 expand_string_message = string_sprintf("%s (%s)", expand_string_message,
2203 (name[4] == 'c' || name[4] == 'm')?
2204 (isalpha(name[5])?
2205 US"6th character of a user-defined ACL variable must be a digit or underscore" :
2206 US"strict_acl_vars is set" /* Syntax is OK, it has to be this */
2207 ) :
2208 US"user-defined ACL variables must start acl_c or acl_m");
2209 }
2210
2211
2212
2213 /*
2214 Load args from sub array to globals, and call acl_check().
2215 Sub array will be corrupted on return.
2216
2217 Returns: OK access is granted by an ACCEPT verb
2218 DISCARD access is (apparently) granted by a DISCARD verb
2219 FAIL access is denied
2220 FAIL_DROP access is denied; drop the connection
2221 DEFER can't tell at the moment
2222 ERROR disaster
2223 */
2224 static int
2225 eval_acl(uschar ** sub, int nsub, uschar ** user_msgp)
2226 {
2227 int i;
2228 int sav_narg = acl_narg;
2229 int ret;
2230 uschar * dummy_logmsg;
2231 extern int acl_where;
2232
2233 if(--nsub > nelem(acl_arg)) nsub = nelem(acl_arg);
2234 for (i = 0; i < nsub && sub[i+1]; i++)
2235 {
2236 uschar * tmp = acl_arg[i];
2237 acl_arg[i] = sub[i+1]; /* place callers args in the globals */
2238 sub[i+1] = tmp; /* stash the old args using our caller's storage */
2239 }
2240 acl_narg = i;
2241 while (i < nsub)
2242 {
2243 sub[i+1] = acl_arg[i];
2244 acl_arg[i++] = NULL;
2245 }
2246
2247 DEBUG(D_expand)
2248 debug_printf_indent("expanding: acl: %s arg: %s%s\n",
2249 sub[0],
2250 acl_narg>0 ? acl_arg[0] : US"<none>",
2251 acl_narg>1 ? " +more" : "");
2252
2253 ret = acl_eval(acl_where, sub[0], user_msgp, &dummy_logmsg);
2254
2255 for (i = 0; i < nsub; i++)
2256 acl_arg[i] = sub[i+1]; /* restore old args */
2257 acl_narg = sav_narg;
2258
2259 return ret;
2260 }
2261
2262
2263
2264
2265 /* Return pointer to dewrapped string, with enclosing specified chars removed.
2266 The given string is modified on return. Leading whitespace is skipped while
2267 looking for the opening wrap character, then the rest is scanned for the trailing
2268 (non-escaped) wrap character. A backslash in the string will act as an escape.
2269
2270 A nul is written over the trailing wrap, and a pointer to the char after the
2271 leading wrap is returned.
2272
2273 Arguments:
2274 s String for de-wrapping
2275 wrap Two-char string, the first being the opener, second the closer wrapping
2276 character
2277 Return:
2278 Pointer to de-wrapped string, or NULL on error (with expand_string_message set).
2279 */
2280
2281 static uschar *
2282 dewrap(uschar * s, const uschar * wrap)
2283 {
2284 uschar * p = s;
2285 unsigned depth = 0;
2286 BOOL quotesmode = wrap[0] == wrap[1];
2287
2288 if (Uskip_whitespace(&p) == *wrap)
2289 {
2290 s = ++p;
2291 wrap++;
2292 while (*p)
2293 {
2294 if (*p == '\\') p++;
2295 else if (!quotesmode && *p == wrap[-1]) depth++;
2296 else if (*p == *wrap)
2297 if (depth == 0)
2298 {
2299 *p = '\0';
2300 return s;
2301 }
2302 else
2303 depth--;
2304 p++;
2305 }
2306 }
2307 expand_string_message = string_sprintf("missing '%c'", *wrap);
2308 return NULL;
2309 }
2310
2311
2312 /* Pull off the leading array or object element, returning
2313 a copy in an allocated string. Update the list pointer.
2314
2315 The element may itself be an abject or array.
2316 Return NULL when the list is empty.
2317 */
2318
2319 static uschar *
2320 json_nextinlist(const uschar ** list)
2321 {
2322 unsigned array_depth = 0, object_depth = 0;
2323 const uschar * s = *list, * item;
2324
2325 while (isspace(*s)) s++;
2326
2327 for (item = s;
2328 *s && (*s != ',' || array_depth != 0 || object_depth != 0);
2329 s++)
2330 switch (*s)
2331 {
2332 case '[': array_depth++; break;
2333 case ']': array_depth--; break;
2334 case '{': object_depth++; break;
2335 case '}': object_depth--; break;
2336 }
2337 *list = *s ? s+1 : s;
2338 if (item == s) return NULL;
2339 item = string_copyn(item, s - item);
2340 DEBUG(D_expand) debug_printf_indent(" json ele: '%s'\n", item);
2341 return US item;
2342 }
2343
2344
2345
2346 /************************************************/
2347 /* Return offset in ops table, or -1 if not found.
2348 Repoint to just after the operator in the string.
2349
2350 Argument:
2351 ss string representation of operator
2352 opname split-out operator name
2353 */
2354
2355 static int
2356 identify_operator(const uschar ** ss, uschar ** opname)
2357 {
2358 const uschar * s = *ss;
2359 uschar name[256];
2360
2361 /* Numeric comparisons are symbolic */
2362
2363 if (*s == '=' || *s == '>' || *s == '<')
2364 {
2365 int p = 0;
2366 name[p++] = *s++;
2367 if (*s == '=')
2368 {
2369 name[p++] = '=';
2370 s++;
2371 }
2372 name[p] = 0;
2373 }
2374
2375 /* All other conditions are named */
2376
2377 else
2378 s = read_name(name, sizeof(name), s, US"_");
2379 *ss = s;
2380
2381 /* If we haven't read a name, it means some non-alpha character is first. */
2382
2383 if (!name[0])
2384 {
2385 expand_string_message = string_sprintf("condition name expected, "
2386 "but found \"%.16s\"", s);
2387 return -1;
2388 }
2389 if (opname)
2390 *opname = string_copy(name);
2391
2392 return chop_match(name, cond_table, nelem(cond_table));
2393 }
2394
2395
2396 /*************************************************
2397 * Handle MD5 or SHA-1 computation for HMAC *
2398 *************************************************/
2399
2400 /* These are some wrapping functions that enable the HMAC code to be a bit
2401 cleaner. A good compiler will spot the tail recursion.
2402
2403 Arguments:
2404 type HMAC_MD5 or HMAC_SHA1
2405 remaining are as for the cryptographic hash functions
2406
2407 Returns: nothing
2408 */
2409
2410 static void
2411 chash_start(int type, void * base)
2412 {
2413 if (type == HMAC_MD5)
2414 md5_start((md5 *)base);
2415 else
2416 sha1_start((hctx *)base);
2417 }
2418
2419 static void
2420 chash_mid(int type, void * base, const uschar * string)
2421 {
2422 if (type == HMAC_MD5)
2423 md5_mid((md5 *)base, string);
2424 else
2425 sha1_mid((hctx *)base, string);
2426 }
2427
2428 static void
2429 chash_end(int type, void * base, const uschar * string, int length,
2430 uschar * digest)
2431 {
2432 if (type == HMAC_MD5)
2433 md5_end((md5 *)base, string, length, digest);
2434 else
2435 sha1_end((hctx *)base, string, length, digest);
2436 }
2437
2438
2439
2440
2441 /* Do an hmac_md5. The result is _not_ nul-terminated, and is sized as
2442 the smaller of a full hmac_md5 result (16 bytes) or the supplied output buffer.
2443
2444 Arguments:
2445 key encoding key, nul-terminated
2446 src data to be hashed, nul-terminated
2447 buf output buffer
2448 len size of output buffer
2449 */
2450
2451 static void
2452 hmac_md5(const uschar * key, const uschar * src, uschar * buf, unsigned len)
2453 {
2454 md5 md5_base;
2455 const uschar * keyptr;
2456 uschar * p;
2457 unsigned int keylen;
2458
2459 #define MD5_HASHLEN 16
2460 #define MD5_HASHBLOCKLEN 64
2461
2462 uschar keyhash[MD5_HASHLEN];
2463 uschar innerhash[MD5_HASHLEN];
2464 uschar finalhash[MD5_HASHLEN];
2465 uschar innerkey[MD5_HASHBLOCKLEN];
2466 uschar outerkey[MD5_HASHBLOCKLEN];
2467
2468 keyptr = key;
2469 keylen = Ustrlen(keyptr);
2470
2471 /* If the key is longer than the hash block length, then hash the key
2472 first */
2473
2474 if (keylen > MD5_HASHBLOCKLEN)
2475 {
2476 chash_start(HMAC_MD5, &md5_base);
2477 chash_end(HMAC_MD5, &md5_base, keyptr, keylen, keyhash);
2478 keyptr = keyhash;
2479 keylen = MD5_HASHLEN;
2480 }
2481
2482 /* Now make the inner and outer key values */
2483
2484 memset(innerkey, 0x36, MD5_HASHBLOCKLEN);
2485 memset(outerkey, 0x5c, MD5_HASHBLOCKLEN);
2486
2487 for (int i = 0; i < keylen; i++)
2488 {
2489 innerkey[i] ^= keyptr[i];
2490 outerkey[i] ^= keyptr[i];
2491 }
2492
2493 /* Now do the hashes */
2494
2495 chash_start(HMAC_MD5, &md5_base);
2496 chash_mid(HMAC_MD5, &md5_base, innerkey);
2497 chash_end(HMAC_MD5, &md5_base, src, Ustrlen(src), innerhash);
2498
2499 chash_start(HMAC_MD5, &md5_base);
2500 chash_mid(HMAC_MD5, &md5_base, outerkey);
2501 chash_end(HMAC_MD5, &md5_base, innerhash, MD5_HASHLEN, finalhash);
2502
2503 /* Encode the final hash as a hex string, limited by output buffer size */
2504
2505 p = buf;
2506 for (int i = 0, j = len; i < MD5_HASHLEN; i++)
2507 {
2508 if (j-- <= 0) break;
2509 *p++ = hex_digits[(finalhash[i] & 0xf0) >> 4];
2510 if (j-- <= 0) break;
2511 *p++ = hex_digits[finalhash[i] & 0x0f];
2512 }
2513 return;
2514 }
2515
2516
2517 /*************************************************
2518 * Read and evaluate a condition *
2519 *************************************************/
2520
2521 /*
2522 Arguments:
2523 s points to the start of the condition text
2524 resetok points to a BOOL which is written false if it is unsafe to
2525 free memory. Certain condition types (acl) may have side-effect
2526 allocation which must be preserved.
2527 yield points to a BOOL to hold the result of the condition test;
2528 if NULL, we are just reading through a condition that is
2529 part of an "or" combination to check syntax, or in a state
2530 where the answer isn't required
2531
2532 Returns: a pointer to the first character after the condition, or
2533 NULL after an error
2534 */
2535
2536 static const uschar *
2537 eval_condition(const uschar *s, BOOL *resetok, BOOL *yield)
2538 {
2539 BOOL testfor = TRUE;
2540 BOOL tempcond, combined_cond;
2541 BOOL *subcondptr;
2542 BOOL sub2_honour_dollar = TRUE;
2543 BOOL is_forany, is_json, is_jsons;
2544 int rc, cond_type, roffset;
2545 int_eximarith_t num[2];
2546 struct stat statbuf;
2547 uschar * opname;
2548 uschar name[256];
2549 const uschar *sub[10];
2550
2551 const pcre *re;
2552 const uschar *rerror;
2553
2554 for (;;)
2555 {
2556 while (isspace(*s)) s++;
2557 if (*s == '!') { testfor = !testfor; s++; } else break;
2558 }
2559
2560 switch(cond_type = identify_operator(&s, &opname))
2561 {
2562 /* def: tests for a non-empty variable, or for the existence of a header. If
2563 yield == NULL we are in a skipping state, and don't care about the answer. */
2564
2565 case ECOND_DEF:
2566 {
2567 uschar * t;
2568
2569 if (*s != ':')
2570 {
2571 expand_string_message = US"\":\" expected after \"def\"";
2572 return NULL;
2573 }
2574
2575 s = read_name(name, sizeof(name), s+1, US"_");
2576
2577 /* Test for a header's existence. If the name contains a closing brace
2578 character, this may be a user error where the terminating colon has been
2579 omitted. Set a flag to adjust a subsequent error message in this case. */
2580
2581 if ( ( *(t = name) == 'h'
2582 || (*t == 'r' || *t == 'l' || *t == 'b') && *++t == 'h'
2583 )
2584 && (*++t == '_' || Ustrncmp(t, "eader_", 6) == 0)
2585 )
2586 {
2587 s = read_header_name(name, sizeof(name), s);
2588 /* {-for-text-editors */
2589 if (Ustrchr(name, '}') != NULL) malformed_header = TRUE;
2590 if (yield) *yield =
2591 (find_header(name, NULL, FH_EXISTS_ONLY, NULL) != NULL) == testfor;
2592 }
2593
2594 /* Test for a variable's having a non-empty value. A non-existent variable
2595 causes an expansion failure. */
2596
2597 else
2598 {
2599 if (!(t = find_variable(name, TRUE, yield == NULL, NULL)))
2600 {
2601 expand_string_message = name[0]
2602 ? string_sprintf("unknown variable \"%s\" after \"def:\"", name)
2603 : US"variable name omitted after \"def:\"";
2604 check_variable_error_message(name);
2605 return NULL;
2606 }
2607 if (yield) *yield = (t[0] != 0) == testfor;
2608 }
2609
2610 return s;
2611 }
2612
2613
2614 /* first_delivery tests for first delivery attempt */
2615
2616 case ECOND_FIRST_DELIVERY:
2617 if (yield) *yield = f.deliver_firsttime == testfor;
2618 return s;
2619
2620
2621 /* queue_running tests for any process started by a queue runner */
2622
2623 case ECOND_QUEUE_RUNNING:
2624 if (yield) *yield = (queue_run_pid != (pid_t)0) == testfor;
2625 return s;
2626
2627
2628 /* exists: tests for file existence
2629 isip: tests for any IP address
2630 isip4: tests for an IPv4 address
2631 isip6: tests for an IPv6 address
2632 pam: does PAM authentication
2633 radius: does RADIUS authentication
2634 ldapauth: does LDAP authentication
2635 pwcheck: does Cyrus SASL pwcheck authentication
2636 */
2637
2638 case ECOND_EXISTS:
2639 case ECOND_ISIP:
2640 case ECOND_ISIP4:
2641 case ECOND_ISIP6:
2642 case ECOND_PAM:
2643 case ECOND_RADIUS:
2644 case ECOND_LDAPAUTH:
2645 case ECOND_PWCHECK:
2646
2647 while (isspace(*s)) s++;
2648 if (*s != '{') goto COND_FAILED_CURLY_START; /* }-for-text-editors */
2649
2650 sub[0] = expand_string_internal(s+1, TRUE, &s, yield == NULL, TRUE, resetok);
2651 if (!sub[0]) return NULL;
2652 /* {-for-text-editors */
2653 if (*s++ != '}') goto COND_FAILED_CURLY_END;
2654
2655 if (!yield) return s; /* No need to run the test if skipping */
2656
2657 switch(cond_type)
2658 {
2659 case ECOND_EXISTS:
2660 if ((expand_forbid & RDO_EXISTS) != 0)
2661 {
2662 expand_string_message = US"File existence tests are not permitted";
2663 return NULL;
2664 }
2665 *yield = (Ustat(sub[0], &statbuf) == 0) == testfor;
2666 break;
2667
2668 case ECOND_ISIP:
2669 case ECOND_ISIP4:
2670 case ECOND_ISIP6:
2671 rc = string_is_ip_address(sub[0], NULL);
2672 *yield = ((cond_type == ECOND_ISIP)? (rc != 0) :
2673 (cond_type == ECOND_ISIP4)? (rc == 4) : (rc == 6)) == testfor;
2674 break;
2675
2676 /* Various authentication tests - all optionally compiled */
2677
2678 case ECOND_PAM:
2679 #ifdef SUPPORT_PAM
2680 rc = auth_call_pam(sub[0], &expand_string_message);
2681 goto END_AUTH;
2682 #else
2683 goto COND_FAILED_NOT_COMPILED;
2684 #endif /* SUPPORT_PAM */
2685
2686 case ECOND_RADIUS:
2687 #ifdef RADIUS_CONFIG_FILE
2688 rc = auth_call_radius(sub[0], &expand_string_message);
2689 goto END_AUTH;
2690 #else
2691 goto COND_FAILED_NOT_COMPILED;
2692 #endif /* RADIUS_CONFIG_FILE */
2693
2694 case ECOND_LDAPAUTH:
2695 #ifdef LOOKUP_LDAP
2696 {
2697 /* Just to keep the interface the same */
2698 BOOL do_cache;
2699 int old_pool = store_pool;
2700 store_pool = POOL_SEARCH;
2701 rc = eldapauth_find((void *)(-1), NULL, sub[0], Ustrlen(sub[0]), NULL,
2702 &expand_string_message, &do_cache);
2703 store_pool = old_pool;
2704 }
2705 goto END_AUTH;
2706 #else
2707 goto COND_FAILED_NOT_COMPILED;
2708 #endif /* LOOKUP_LDAP */
2709
2710 case ECOND_PWCHECK:
2711 #ifdef CYRUS_PWCHECK_SOCKET
2712 rc = auth_call_pwcheck(sub[0], &expand_string_message);
2713 goto END_AUTH;
2714 #else
2715 goto COND_FAILED_NOT_COMPILED;
2716 #endif /* CYRUS_PWCHECK_SOCKET */
2717
2718 #if defined(SUPPORT_PAM) || defined(RADIUS_CONFIG_FILE) || \
2719 defined(LOOKUP_LDAP) || defined(CYRUS_PWCHECK_SOCKET)
2720 END_AUTH:
2721 if (rc == ERROR || rc == DEFER) return NULL;
2722 *yield = (rc == OK) == testfor;
2723 #endif
2724 }
2725 return s;
2726
2727
2728 /* call ACL (in a conditional context). Accept true, deny false.
2729 Defer is a forced-fail. Anything set by message= goes to $value.
2730 Up to ten parameters are used; we use the braces round the name+args
2731 like the saslauthd condition does, to permit a variable number of args.
2732 See also the expansion-item version EITEM_ACL and the traditional
2733 acl modifier ACLC_ACL.
2734 Since the ACL may allocate new global variables, tell our caller to not
2735 reclaim memory.
2736 */
2737
2738 case ECOND_ACL:
2739 /* ${if acl {{name}{arg1}{arg2}...} {yes}{no}} */
2740 {
2741 uschar *sub[10];
2742 uschar *user_msg;
2743 BOOL cond = FALSE;
2744
2745 while (isspace(*s)) s++;
2746 if (*s++ != '{') goto COND_FAILED_CURLY_START; /*}*/
2747
2748 switch(read_subs(sub, nelem(sub), 1,
2749 &s, yield == NULL, TRUE, name, resetok))
2750 {
2751 case 1: expand_string_message = US"too few arguments or bracketing "
2752 "error for acl";
2753 case 2:
2754 case 3: return NULL;
2755 }
2756
2757 if (yield)
2758 {
2759 int rc;
2760 *resetok = FALSE; /* eval_acl() might allocate; do not reclaim */
2761 switch(rc = eval_acl(sub, nelem(sub), &user_msg))
2762 {
2763 case OK:
2764 cond = TRUE;
2765 case FAIL:
2766 lookup_value = NULL;
2767 if (user_msg)
2768 lookup_value = string_copy(user_msg);
2769 *yield = cond == testfor;
2770 break;
2771
2772 case DEFER:
2773 f.expand_string_forcedfail = TRUE;
2774 /*FALLTHROUGH*/
2775 default:
2776 expand_string_message = string_sprintf("%s from acl \"%s\"",
2777 rc_names[rc], sub[0]);
2778 return NULL;
2779 }
2780 }
2781 return s;
2782 }
2783
2784
2785 /* saslauthd: does Cyrus saslauthd authentication. Four parameters are used:
2786
2787 ${if saslauthd {{username}{password}{service}{realm}} {yes}{no}}
2788
2789 However, the last two are optional. That is why the whole set is enclosed
2790 in their own set of braces. */
2791
2792 case ECOND_SASLAUTHD:
2793 #ifndef CYRUS_SASLAUTHD_SOCKET
2794 goto COND_FAILED_NOT_COMPILED;
2795 #else
2796 {
2797 uschar *sub[4];
2798 while (isspace(*s)) s++;
2799 if (*s++ != '{') goto COND_FAILED_CURLY_START; /* }-for-text-editors */
2800 switch(read_subs(sub, nelem(sub), 2, &s, yield == NULL, TRUE, name,
2801 resetok))
2802 {
2803 case 1: expand_string_message = US"too few arguments or bracketing "
2804 "error for saslauthd";
2805 case 2:
2806 case 3: return NULL;
2807 }
2808 if (!sub[2]) sub[3] = NULL; /* realm if no service */
2809 if (yield)
2810 {
2811 int rc = auth_call_saslauthd(sub[0], sub[1], sub[2], sub[3],
2812 &expand_string_message);
2813 if (rc == ERROR || rc == DEFER) return NULL;
2814 *yield = (rc == OK) == testfor;
2815 }
2816 return s;
2817 }
2818 #endif /* CYRUS_SASLAUTHD_SOCKET */
2819
2820
2821 /* symbolic operators for numeric and string comparison, and a number of
2822 other operators, all requiring two arguments.
2823
2824 crypteq: encrypts plaintext and compares against an encrypted text,
2825 using crypt(), crypt16(), MD5 or SHA-1
2826 inlist/inlisti: checks if first argument is in the list of the second
2827 match: does a regular expression match and sets up the numerical
2828 variables if it succeeds
2829 match_address: matches in an address list
2830 match_domain: matches in a domain list
2831 match_ip: matches a host list that is restricted to IP addresses
2832 match_local_part: matches in a local part list
2833 */
2834
2835 case ECOND_MATCH_ADDRESS:
2836 case ECOND_MATCH_DOMAIN:
2837 case ECOND_MATCH_IP:
2838 case ECOND_MATCH_LOCAL_PART:
2839 #ifndef EXPAND_LISTMATCH_RHS
2840 sub2_honour_dollar = FALSE;
2841 #endif
2842 /* FALLTHROUGH */
2843
2844 case ECOND_CRYPTEQ:
2845 case ECOND_INLIST:
2846 case ECOND_INLISTI:
2847 case ECOND_MATCH:
2848
2849 case ECOND_NUM_L: /* Numerical comparisons */
2850 case ECOND_NUM_LE:
2851 case ECOND_NUM_E:
2852 case ECOND_NUM_EE:
2853 case ECOND_NUM_G:
2854 case ECOND_NUM_GE:
2855
2856 case ECOND_STR_LT: /* String comparisons */
2857 case ECOND_STR_LTI:
2858 case ECOND_STR_LE:
2859 case ECOND_STR_LEI:
2860 case ECOND_STR_EQ:
2861 case ECOND_STR_EQI:
2862 case ECOND_STR_GT:
2863 case ECOND_STR_GTI:
2864 case ECOND_STR_GE:
2865 case ECOND_STR_GEI:
2866
2867 for (int i = 0; i < 2; i++)
2868 {
2869 /* Sometimes, we don't expand substrings; too many insecure configurations
2870 created using match_address{}{} and friends, where the second param
2871 includes information from untrustworthy sources. */
2872 BOOL honour_dollar = TRUE;
2873 if ((i > 0) && !sub2_honour_dollar)
2874 honour_dollar = FALSE;
2875
2876 while (isspace(*s)) s++;
2877 if (*s != '{')
2878 {
2879 if (i == 0) goto COND_FAILED_CURLY_START;
2880 expand_string_message = string_sprintf("missing 2nd string in {} "
2881 "after \"%s\"", opname);
2882 return NULL;
2883 }
2884 if (!(sub[i] = expand_string_internal(s+1, TRUE, &s, yield == NULL,
2885 honour_dollar, resetok)))
2886 return NULL;
2887 DEBUG(D_expand) if (i == 1 && !sub2_honour_dollar && Ustrchr(sub[1], '$'))
2888 debug_printf_indent("WARNING: the second arg is NOT expanded,"
2889 " for security reasons\n");
2890 if (*s++ != '}') goto COND_FAILED_CURLY_END;
2891
2892 /* Convert to numerical if required; we know that the names of all the
2893 conditions that compare numbers do not start with a letter. This just saves
2894 checking for them individually. */
2895
2896 if (!isalpha(opname[0]) && yield)
2897 if (sub[i][0] == 0)
2898 {
2899 num[i] = 0;
2900 DEBUG(D_expand)
2901 debug_printf_indent("empty string cast to zero for numerical comparison\n");
2902 }
2903 else
2904 {
2905 num[i] = expanded_string_integer(sub[i], FALSE);
2906 if (expand_string_message) return NULL;
2907 }
2908 }
2909
2910 /* Result not required */
2911
2912 if (!yield) return s;
2913
2914 /* Do an appropriate comparison */
2915
2916 switch(cond_type)
2917 {
2918 case ECOND_NUM_E:
2919 case ECOND_NUM_EE:
2920 tempcond = (num[0] == num[1]);
2921 break;
2922
2923 case ECOND_NUM_G:
2924 tempcond = (num[0] > num[1]);
2925 break;
2926
2927 case ECOND_NUM_GE:
2928 tempcond = (num[0] >= num[1]);
2929 break;
2930
2931 case ECOND_NUM_L:
2932 tempcond = (num[0] < num[1]);
2933 break;
2934
2935 case ECOND_NUM_LE:
2936 tempcond = (num[0] <= num[1]);
2937 break;
2938
2939 case ECOND_STR_LT:
2940 tempcond = (Ustrcmp(sub[0], sub[1]) < 0);
2941 break;
2942
2943 case ECOND_STR_LTI:
2944 tempcond = (strcmpic(sub[0], sub[1]) < 0);
2945 break;
2946
2947 case ECOND_STR_LE:
2948 tempcond = (Ustrcmp(sub[0], sub[1]) <= 0);
2949 break;
2950
2951 case ECOND_STR_LEI:
2952 tempcond = (strcmpic(sub[0], sub[1]) <= 0);
2953 break;
2954
2955 case ECOND_STR_EQ:
2956 tempcond = (Ustrcmp(sub[0], sub[1]) == 0);
2957 break;
2958
2959 case ECOND_STR_EQI:
2960 tempcond = (strcmpic(sub[0], sub[1]) == 0);
2961 break;
2962
2963 case ECOND_STR_GT:
2964 tempcond = (Ustrcmp(sub[0], sub[1]) > 0);
2965 break;
2966
2967 case ECOND_STR_GTI:
2968 tempcond = (strcmpic(sub[0], sub[1]) > 0);
2969 break;
2970
2971 case ECOND_STR_GE:
2972 tempcond = (Ustrcmp(sub[0], sub[1]) >= 0);
2973 break;
2974
2975 case ECOND_STR_GEI:
2976 tempcond = (strcmpic(sub[0], sub[1]) >= 0);
2977 break;
2978
2979 case ECOND_MATCH: /* Regular expression match */
2980 if (!(re = pcre_compile(CS sub[1], PCRE_COPT, CCSS &rerror,
2981 &roffset, NULL)))
2982 {
2983 expand_string_message = string_sprintf("regular expression error in "
2984 "\"%s\": %s at offset %d", sub[1], rerror, roffset);
2985 return NULL;
2986 }
2987 tempcond = regex_match_and_setup(re, sub[0], 0, -1);
2988 break;
2989
2990 case ECOND_MATCH_ADDRESS: /* Match in an address list */
2991 rc = match_address_list(sub[0], TRUE, FALSE, &(sub[1]), NULL, -1, 0, NULL);
2992 goto MATCHED_SOMETHING;
2993
2994 case ECOND_MATCH_DOMAIN: /* Match in a domain list */
2995 rc = match_isinlist(sub[0], &(sub[1]), 0, &domainlist_anchor, NULL,
2996 MCL_DOMAIN + MCL_NOEXPAND, TRUE, NULL);
2997 goto MATCHED_SOMETHING;
2998
2999 case ECOND_MATCH_IP: /* Match IP address in a host list */
3000 if (sub[0][0] != 0 && string_is_ip_address(sub[0], NULL) == 0)
3001 {
3002 expand_string_message = string_sprintf("\"%s\" is not an IP address",
3003 sub[0]);
3004 return NULL;
3005 }
3006 else
3007 {
3008 unsigned int *nullcache = NULL;
3009 check_host_block cb;
3010
3011 cb.host_name = US"";
3012 cb.host_address = sub[0];
3013
3014 /* If the host address starts off ::ffff: it is an IPv6 address in
3015 IPv4-compatible mode. Find the IPv4 part for checking against IPv4
3016 addresses. */
3017
3018 cb.host_ipv4 = (Ustrncmp(cb.host_address, "::ffff:", 7) == 0)?
3019 cb.host_address + 7 : cb.host_address;
3020
3021 rc = match_check_list(
3022 &sub[1], /* the list */
3023 0, /* separator character */
3024 &hostlist_anchor, /* anchor pointer */
3025 &nullcache, /* cache pointer */
3026 check_host, /* function for testing */
3027 &cb, /* argument for function */
3028 MCL_HOST, /* type of check */
3029 sub[0], /* text for debugging */
3030 NULL); /* where to pass back data */
3031 }
3032 goto MATCHED_SOMETHING;
3033
3034 case ECOND_MATCH_LOCAL_PART:
3035 rc = match_isinlist(sub[0], &(sub[1]), 0, &localpartlist_anchor, NULL,
3036 MCL_LOCALPART + MCL_NOEXPAND, TRUE, NULL);
3037 /* Fall through */
3038 /* VVVVVVVVVVVV */
3039 MATCHED_SOMETHING:
3040 switch(rc)
3041 {
3042 case OK:
3043 tempcond = TRUE;
3044 break;
3045
3046 case FAIL:
3047 tempcond = FALSE;
3048 break;
3049
3050 case DEFER:
3051 expand_string_message = string_sprintf("unable to complete match "
3052 "against \"%s\": %s", sub[1], search_error_message);
3053 return NULL;
3054 }
3055
3056 break;
3057
3058 /* Various "encrypted" comparisons. If the second string starts with
3059 "{" then an encryption type is given. Default to crypt() or crypt16()
3060 (build-time choice). */
3061 /* }-for-text-editors */
3062
3063 case ECOND_CRYPTEQ:
3064 #ifndef SUPPORT_CRYPTEQ
3065 goto COND_FAILED_NOT_COMPILED;
3066 #else
3067 if (strncmpic(sub[1], US"{md5}", 5) == 0)
3068 {
3069 int sublen = Ustrlen(sub[1]+5);
3070 md5 base;
3071 uschar digest[16];
3072
3073 md5_start(&base);
3074 md5_end(&base, sub[0], Ustrlen(sub[0]), digest);
3075
3076 /* If the length that we are comparing against is 24, the MD5 digest
3077 is expressed as a base64 string. This is the way LDAP does it. However,
3078 some other software uses a straightforward hex representation. We assume
3079 this if the length is 32. Other lengths fail. */
3080
3081 if (sublen == 24)
3082 {
3083 uschar *coded = b64encode(CUS digest, 16);
3084 DEBUG(D_auth) debug_printf("crypteq: using MD5+B64 hashing\n"
3085 " subject=%s\n crypted=%s\n", coded, sub[1]+5);
3086 tempcond = (Ustrcmp(coded, sub[1]+5) == 0);
3087 }
3088 else if (sublen == 32)
3089 {
3090 uschar coded[36];
3091 for (int i = 0; i < 16; i++) sprintf(CS (coded+2*i), "%02X", digest[i]);
3092 coded[32] = 0;
3093 DEBUG(D_auth) debug_printf("crypteq: using MD5+hex hashing\n"
3094 " subject=%s\n crypted=%s\n", coded, sub[1]+5);
3095 tempcond = (strcmpic(coded, sub[1]+5) == 0);
3096 }
3097 else
3098 {
3099 DEBUG(D_auth) debug_printf("crypteq: length for MD5 not 24 or 32: "
3100 "fail\n crypted=%s\n", sub[1]+5);
3101 tempcond = FALSE;
3102 }
3103 }
3104
3105 else if (strncmpic(sub[1], US"{sha1}", 6) == 0)
3106 {
3107 int sublen = Ustrlen(sub[1]+6);
3108 hctx h;
3109 uschar digest[20];
3110
3111 sha1_start(&h);
3112 sha1_end(&h, sub[0], Ustrlen(sub[0]), digest);
3113
3114 /* If the length that we are comparing against is 28, assume the SHA1
3115 digest is expressed as a base64 string. If the length is 40, assume a
3116 straightforward hex representation. Other lengths fail. */
3117
3118 if (sublen == 28)
3119 {
3120 uschar *coded = b64encode(CUS digest, 20);
3121 DEBUG(D_auth) debug_printf("crypteq: using SHA1+B64 hashing\n"
3122 " subject=%s\n crypted=%s\n", coded, sub[1]+6);
3123 tempcond = (Ustrcmp(coded, sub[1]+6) == 0);
3124 }
3125 else if (sublen == 40)
3126 {
3127 uschar coded[44];
3128 for (int i = 0; i < 20; i++) sprintf(CS (coded+2*i), "%02X", digest[i]);
3129 coded[40] = 0;
3130 DEBUG(D_auth) debug_printf("crypteq: using SHA1+hex hashing\n"
3131 " subject=%s\n crypted=%s\n", coded, sub[1]+6);
3132 tempcond = (strcmpic(coded, sub[1]+6) == 0);
3133 }
3134 else
3135 {
3136 DEBUG(D_auth) debug_printf("crypteq: length for SHA-1 not 28 or 40: "
3137 "fail\n crypted=%s\n", sub[1]+6);
3138 tempcond = FALSE;
3139 }
3140 }
3141
3142 else /* {crypt} or {crypt16} and non-{ at start */
3143 /* }-for-text-editors */
3144 {
3145 int which = 0;
3146 uschar *coded;
3147
3148 if (strncmpic(sub[1], US"{crypt}", 7) == 0)
3149 {
3150 sub[1] += 7;
3151 which = 1;
3152 }
3153 else if (strncmpic(sub[1], US"{crypt16}", 9) == 0)
3154 {
3155 sub[1] += 9;
3156 which = 2;
3157 }
3158 else if (sub[1][0] == '{') /* }-for-text-editors */
3159 {
3160 expand_string_message = string_sprintf("unknown encryption mechanism "
3161 "in \"%s\"", sub[1]);
3162 return NULL;
3163 }
3164
3165 switch(which)
3166 {
3167 case 0: coded = US DEFAULT_CRYPT(CS sub[0], CS sub[1]); break;
3168 case 1: coded = US crypt(CS sub[0], CS sub[1]); break;
3169 default: coded = US crypt16(CS sub[0], CS sub[1]); break;
3170 }
3171
3172 #define STR(s) # s
3173 #define XSTR(s) STR(s)
3174 DEBUG(D_auth) debug_printf("crypteq: using %s()\n"
3175 " subject=%s\n crypted=%s\n",
3176 which == 0 ? XSTR(DEFAULT_CRYPT) : which == 1 ? "crypt" : "crypt16",
3177 coded, sub[1]);
3178 #undef STR
3179 #undef XSTR
3180
3181 /* If the encrypted string contains fewer than two characters (for the
3182 salt), force failure. Otherwise we get false positives: with an empty
3183 string the yield of crypt() is an empty string! */
3184
3185 if (coded)
3186 tempcond = Ustrlen(sub[1]) < 2 ? FALSE : Ustrcmp(coded, sub[1]) == 0;
3187 else if (errno == EINVAL)
3188 tempcond = FALSE;
3189 else
3190 {
3191 expand_string_message = string_sprintf("crypt error: %s\n",
3192 US strerror(errno));
3193 return NULL;
3194 }
3195 }
3196 break;
3197 #endif /* SUPPORT_CRYPTEQ */
3198
3199 case ECOND_INLIST:
3200 case ECOND_INLISTI:
3201 {
3202 const uschar * list = sub[1];
3203 int sep = 0;
3204 uschar *save_iterate_item = iterate_item;
3205 int (*compare)(const uschar *, const uschar *);
3206
3207 DEBUG(D_expand) debug_printf_indent("condition: %s item: %s\n", opname, sub[0]);
3208
3209 tempcond = FALSE;
3210 compare = cond_type == ECOND_INLISTI
3211 ? strcmpic : (int (*)(const uschar *, const uschar *)) strcmp;
3212
3213 while ((iterate_item = string_nextinlist(&list, &sep, NULL, 0)))
3214 {
3215 DEBUG(D_expand) debug_printf_indent(" compare %s\n", iterate_item);
3216 if (compare(sub[0], iterate_item) == 0)
3217 {
3218 tempcond = TRUE;
3219 break;
3220 }
3221 }
3222 iterate_item = save_iterate_item;
3223 }
3224
3225 } /* Switch for comparison conditions */
3226
3227 *yield = tempcond == testfor;
3228 return s; /* End of comparison conditions */
3229
3230
3231 /* and/or: computes logical and/or of several conditions */
3232
3233 case ECOND_AND:
3234 case ECOND_OR:
3235 subcondptr = (yield == NULL) ? NULL : &tempcond;
3236 combined_cond = (cond_type == ECOND_AND);
3237
3238 while (isspace(*s)) s++;
3239 if (*s++ != '{') goto COND_FAILED_CURLY_START; /* }-for-text-editors */
3240
3241 for (;;)
3242 {
3243 while (isspace(*s)) s++;
3244 /* {-for-text-editors */
3245 if (*s == '}') break;
3246 if (*s != '{') /* }-for-text-editors */
3247 {
3248 expand_string_message = string_sprintf("each subcondition "
3249 "inside an \"%s{...}\" condition must be in its own {}", opname);
3250 return NULL;
3251 }
3252
3253 if (!(s = eval_condition(s+1, resetok, subcondptr)))
3254 {
3255 expand_string_message = string_sprintf("%s inside \"%s{...}\" condition",
3256 expand_string_message, opname);
3257 return NULL;
3258 }
3259 while (isspace(*s)) s++;
3260
3261 /* {-for-text-editors */
3262 if (*s++ != '}')
3263 {
3264 /* {-for-text-editors */
3265 expand_string_message = string_sprintf("missing } at end of condition "
3266 "inside \"%s\" group", opname);
3267 return NULL;
3268 }
3269
3270 if (yield)
3271 if (cond_type == ECOND_AND)
3272 {
3273 combined_cond &= tempcond;
3274 if (!combined_cond) subcondptr = NULL; /* once false, don't */
3275 } /* evaluate any more */
3276 else
3277 {
3278 combined_cond |= tempcond;
3279 if (combined_cond) subcondptr = NULL; /* once true, don't */
3280 } /* evaluate any more */
3281 }
3282
3283 if (yield) *yield = (combined_cond == testfor);
3284 return ++s;
3285
3286
3287 /* forall/forany: iterates a condition with different values */
3288
3289 case ECOND_FORALL: is_forany = FALSE; is_json = FALSE; is_jsons = FALSE; goto FORMANY;
3290 case ECOND_FORANY: is_forany = TRUE; is_json = FALSE; is_jsons = FALSE; goto FORMANY;
3291 case ECOND_FORALL_JSON: is_forany = FALSE; is_json = TRUE; is_jsons = FALSE; goto FORMANY;
3292 case ECOND_FORANY_JSON: is_forany = TRUE; is_json = TRUE; is_jsons = FALSE; goto FORMANY;
3293 case ECOND_FORALL_JSONS: is_forany = FALSE; is_json = TRUE; is_jsons = TRUE; goto FORMANY;
3294 case ECOND_FORANY_JSONS: is_forany = TRUE; is_json = TRUE; is_jsons = TRUE; goto FORMANY;
3295
3296 FORMANY:
3297 {
3298 const uschar * list;
3299 int sep = 0;
3300 uschar *save_iterate_item = iterate_item;
3301
3302 DEBUG(D_expand) debug_printf_indent("condition: %s\n", opname);
3303
3304 while (isspace(*s)) s++;
3305 if (*s++ != '{') goto COND_FAILED_CURLY_START; /* }-for-text-editors */
3306 if (!(sub[0] = expand_string_internal(s, TRUE, &s, yield == NULL, TRUE, resetok)))
3307 return NULL;
3308 /* {-for-text-editors */
3309 if (*s++ != '}') goto COND_FAILED_CURLY_END;
3310
3311 while (isspace(*s)) s++;
3312 if (*s++ != '{') goto COND_FAILED_CURLY_START; /* }-for-text-editors */
3313
3314 sub[1] = s;
3315
3316 /* Call eval_condition once, with result discarded (as if scanning a
3317 "false" part). This allows us to find the end of the condition, because if
3318 the list it empty, we won't actually evaluate the condition for real. */
3319
3320 if (!(s = eval_condition(sub[1], resetok, NULL)))
3321 {
3322 expand_string_message = string_sprintf("%s inside \"%s\" condition",
3323 expand_string_message, opname);
3324 return NULL;
3325 }
3326 while (isspace(*s)) s++;
3327
3328 /* {-for-text-editors */
3329 if (*s++ != '}')
3330 {
3331 /* {-for-text-editors */
3332 expand_string_message = string_sprintf("missing } at end of condition "
3333 "inside \"%s\"", opname);
3334 return NULL;
3335 }
3336
3337 if (yield) *yield = !testfor;
3338 list = sub[0];
3339 if (is_json) list = dewrap(string_copy(list), US"[]");
3340 while ((iterate_item = is_json
3341 ? json_nextinlist(&list) : string_nextinlist(&list, &sep, NULL, 0)))
3342 {
3343 if (is_jsons)
3344 if (!(iterate_item = dewrap(iterate_item, US"\"\"")))
3345 {
3346 expand_string_message =
3347 string_sprintf("%s wrapping string result for extract jsons",
3348 expand_string_message);
3349 iterate_item = save_iterate_item;
3350 return NULL;
3351 }
3352
3353 DEBUG(D_expand) debug_printf_indent("%s: $item = \"%s\"\n", opname, iterate_item);
3354 if (!eval_condition(sub[1], resetok, &tempcond))
3355 {
3356 expand_string_message = string_sprintf("%s inside \"%s\" condition",
3357 expand_string_message, opname);
3358 iterate_item = save_iterate_item;
3359 return NULL;
3360 }
3361 DEBUG(D_expand) debug_printf_indent("%s: condition evaluated to %s\n", opname,
3362 tempcond? "true":"false");
3363
3364 if (yield) *yield = (tempcond == testfor);
3365 if (tempcond == is_forany) break;
3366 }
3367
3368 iterate_item = save_iterate_item;
3369 return s;
3370 }
3371
3372
3373 /* The bool{} expansion condition maps a string to boolean.
3374 The values supported should match those supported by the ACL condition
3375 (acl.c, ACLC_CONDITION) so that we keep to a minimum the different ideas
3376 of true/false. Note that Router "condition" rules have a different
3377 interpretation, where general data can be used and only a few values
3378 map to FALSE.
3379 Note that readconf.c boolean matching, for boolean configuration options,
3380 only matches true/yes/false/no.
3381 The bool_lax{} condition matches the Router logic, which is much more
3382 liberal. */
3383 case ECOND_BOOL:
3384 case ECOND_BOOL_LAX:
3385 {
3386 uschar *sub_arg[1];
3387 uschar *t, *t2;
3388 uschar *ourname;
3389 size_t len;
3390 BOOL boolvalue = FALSE;
3391 while (isspace(*s)) s++;
3392 if (*s != '{') goto COND_FAILED_CURLY_START; /* }-for-text-editors */
3393 ourname = cond_type == ECOND_BOOL_LAX ? US"bool_lax" : US"bool";
3394 switch(read_subs(sub_arg, 1, 1, &s, yield == NULL, FALSE, ourname, resetok))
3395 {
3396 case 1: expand_string_message = string_sprintf(
3397 "too few arguments or bracketing error for %s",
3398 ourname);
3399 /*FALLTHROUGH*/
3400 case 2:
3401 case 3: return NULL;
3402 }
3403 t = sub_arg[0];
3404 while (isspace(*t)) t++;
3405 len = Ustrlen(t);
3406 if (len)
3407 {
3408 /* trailing whitespace: seems like a good idea to ignore it too */
3409 t2 = t + len - 1;
3410 while (isspace(*t2)) t2--;
3411 if (t2 != (t + len))
3412 {
3413 *++t2 = '\0';
3414 len = t2 - t;
3415 }
3416 }
3417 DEBUG(D_expand)
3418 debug_printf_indent("considering %s: %s\n", ourname, len ? t : US"<empty>");
3419 /* logic for the lax case from expand_check_condition(), which also does
3420 expands, and the logic is both short and stable enough that there should
3421 be no maintenance burden from replicating it. */
3422 if (len == 0)
3423 boolvalue = FALSE;
3424 else if (*t == '-'
3425 ? Ustrspn(t+1, "0123456789") == len-1
3426 : Ustrspn(t, "0123456789") == len)
3427 {
3428 boolvalue = (Uatoi(t) == 0) ? FALSE : TRUE;
3429 /* expand_check_condition only does a literal string "0" check */
3430 if ((cond_type == ECOND_BOOL_LAX) && (len > 1))
3431 boolvalue = TRUE;
3432 }
3433 else if (strcmpic(t, US"true") == 0 || strcmpic(t, US"yes") == 0)
3434 boolvalue = TRUE;
3435 else if (strcmpic(t, US"false") == 0 || strcmpic(t, US"no") == 0)
3436 boolvalue = FALSE;
3437 else if (cond_type == ECOND_BOOL_LAX)
3438 boolvalue = TRUE;
3439 else
3440 {
3441 expand_string_message = string_sprintf("unrecognised boolean "
3442 "value \"%s\"", t);
3443 return NULL;
3444 }
3445 DEBUG(D_expand) debug_printf_indent("%s: condition evaluated to %s\n", ourname,
3446 boolvalue? "true":"false");
3447 if (yield) *yield = (boolvalue == testfor);
3448 return s;
3449 }
3450
3451 #ifdef EXPERIMENTAL_SRS_NATIVE
3452 case ECOND_INBOUND_SRS:
3453 /* ${if inbound_srs {local_part}{secret} {yes}{no}} */
3454 {
3455 uschar * sub[2];
3456 const pcre * re;
3457 int ovec[3*(4+1)];
3458 int n;
3459 uschar cksum[4];
3460 BOOL boolvalue = FALSE;
3461
3462 switch(read_subs(sub, 2, 2, CUSS &s, yield == NULL, FALSE, name, resetok))
3463 {
3464 case 1: expand_string_message = US"too few arguments or bracketing "
3465 "error for inbound_srs";
3466 case 2:
3467 case 3: return NULL;
3468 }
3469
3470 /* Match the given local_part against the SRS-encoded pattern */
3471
3472 re = regex_must_compile(US"^(?i)SRS0=([^=]+)=([A-Z2-7]+)=([^=]*)=(.*)$",
3473 TRUE, FALSE);
3474 if (pcre_exec(re, NULL, CS sub[0], Ustrlen(sub[0]), 0, PCRE_EOPT,
3475 ovec, nelem(ovec)) < 0)
3476 {
3477 DEBUG(D_expand) debug_printf("no match for SRS'd local-part pattern\n");
3478 goto srs_result;
3479 }
3480
3481 /* Side-effect: record the decoded recipient */
3482
3483 srs_recipient = string_sprintf("%.*S@%.*S", /* lowercased */
3484 ovec[9]-ovec[8], sub[0] + ovec[8], /* substring 4 */
3485 ovec[7]-ovec[6], sub[0] + ovec[6]); /* substring 3 */
3486
3487 /* If a zero-length secret was given, we're done. Otherwise carry on
3488 and validate the given SRS local_part againt our secret. */
3489
3490 if (!*sub[1])
3491 {
3492 boolvalue = TRUE;
3493 goto srs_result;
3494 }
3495
3496 /* check the timestamp */
3497 {
3498 struct timeval now;
3499 uschar * ss = sub[0] + ovec[4]; /* substring 2, the timestamp */
3500 long d;
3501
3502 gettimeofday(&now, NULL);
3503 now.tv_sec /= 86400; /* days since epoch */
3504
3505 /* Decode substring 2 from base32 to a number */
3506
3507 for (d = 0, n = ovec[5]-ovec[4]; n; n--)
3508 {
3509 uschar * t = Ustrchr(base32_chars, *ss++);
3510 d = d * 32 + (t - base32_chars);
3511 }
3512
3513 if (((now.tv_sec - d) & 0x3ff) > 10) /* days since SRS generated */
3514 {
3515 DEBUG(D_expand) debug_printf("SRS too old\n");
3516 goto srs_result;
3517 }
3518 }
3519
3520 /* check length of substring 1, the offered checksum */
3521
3522 if (ovec[3]-ovec[2] != 4)
3523 {
3524 DEBUG(D_expand) debug_printf("SRS checksum wrong size\n");
3525 goto srs_result;
3526 }
3527
3528 /* Hash the address with our secret, and compare that computed checksum
3529 with the one extracted from the arg */
3530
3531 hmac_md5(sub[1], srs_recipient, cksum, sizeof(cksum));
3532 if (Ustrncmp(cksum, sub[0] + ovec[2], 4) != 0)
3533 {
3534 DEBUG(D_expand) debug_printf("SRS checksum mismatch\n");
3535 goto srs_result;
3536 }
3537 boolvalue = TRUE;
3538
3539 srs_result:
3540 if (yield) *yield = (boolvalue == testfor);
3541 return s;
3542 }
3543 #endif /*EXPERIMENTAL_SRS_NATIVE*/
3544
3545 /* Unknown condition */
3546
3547 default:
3548 if (!expand_string_message || !*expand_string_message)
3549 expand_string_message = string_sprintf("unknown condition \"%s\"", opname);
3550 return NULL;
3551 } /* End switch on condition type */
3552
3553 /* Missing braces at start and end of data */
3554
3555 COND_FAILED_CURLY_START:
3556 expand_string_message = string_sprintf("missing { after \"%s\"", opname);
3557 return NULL;
3558
3559 COND_FAILED_CURLY_END:
3560 expand_string_message = string_sprintf("missing } at end of \"%s\" condition",
3561 opname);
3562 return NULL;
3563
3564 /* A condition requires code that is not compiled */
3565
3566 #if !defined(SUPPORT_PAM) || !defined(RADIUS_CONFIG_FILE) || \
3567 !defined(LOOKUP_LDAP) || !defined(CYRUS_PWCHECK_SOCKET) || \
3568 !defined(SUPPORT_CRYPTEQ) || !defined(CYRUS_SASLAUTHD_SOCKET)
3569 COND_FAILED_NOT_COMPILED:
3570 expand_string_message = string_sprintf("support for \"%s\" not compiled",
3571 opname);
3572 return NULL;
3573 #endif
3574 }
3575
3576
3577
3578
3579 /*************************************************
3580 * Save numerical variables *
3581 *************************************************/
3582
3583 /* This function is called from items such as "if" that want to preserve and
3584 restore the numbered variables.
3585
3586 Arguments:
3587 save_expand_string points to an array of pointers to set
3588 save_expand_nlength points to an array of ints for the lengths
3589
3590 Returns: the value of expand max to save
3591 */
3592
3593 static int
3594 save_expand_strings(uschar **save_expand_nstring, int *save_expand_nlength)
3595 {
3596 for (int i = 0; i <= expand_nmax; i++)
3597 {
3598 save_expand_nstring[i] = expand_nstring[i];
3599 save_expand_nlength[i] = expand_nlength[i];
3600 }
3601 return expand_nmax;
3602 }
3603
3604
3605
3606 /*************************************************
3607 * Restore numerical variables *
3608 *************************************************/
3609
3610 /* This function restored saved values of numerical strings.
3611
3612 Arguments:
3613 save_expand_nmax the number of strings to restore
3614 save_expand_string points to an array of pointers
3615 save_expand_nlength points to an array of ints
3616
3617 Returns: nothing
3618 */
3619
3620 static void
3621 restore_expand_strings(int save_expand_nmax, uschar **save_expand_nstring,
3622 int *save_expand_nlength)
3623 {
3624 expand_nmax = save_expand_nmax;
3625 for (int i = 0; i <= expand_nmax; i++)
3626 {
3627 expand_nstring[i] = save_expand_nstring[i];
3628 expand_nlength[i] = save_expand_nlength[i];
3629 }
3630 }
3631
3632
3633
3634
3635
3636 /*************************************************
3637 * Handle yes/no substrings *
3638 *************************************************/
3639
3640 /* This function is used by ${if}, ${lookup} and ${extract} to handle the
3641 alternative substrings that depend on whether or not the condition was true,
3642 or the lookup or extraction succeeded. The substrings always have to be
3643 expanded, to check their syntax, but "skipping" is set when the result is not
3644 needed - this avoids unnecessary nested lookups.
3645
3646 Arguments:
3647 skipping TRUE if we were skipping when this item was reached
3648 yes TRUE if the first string is to be used, else use the second
3649 save_lookup a value to put back into lookup_value before the 2nd expansion
3650 sptr points to the input string pointer
3651 yieldptr points to the output growable-string pointer
3652 type "lookup", "if", "extract", "run", "env", "listextract" or
3653 "certextract" for error message
3654 resetok if not NULL, pointer to flag - write FALSE if unsafe to reset
3655 the store.
3656
3657 Returns: 0 OK; lookup_value has been reset to save_lookup
3658 1 expansion failed
3659 2 expansion failed because of bracketing error
3660 */
3661
3662 static int
3663 process_yesno(BOOL skipping, BOOL yes, uschar *save_lookup, const uschar **sptr,
3664 gstring ** yieldptr, uschar *type, BOOL *resetok)
3665 {
3666 int rc = 0;
3667 const uschar *s = *sptr; /* Local value */
3668 uschar *sub1, *sub2;
3669 const uschar * errwhere;
3670
3671 /* If there are no following strings, we substitute the contents of $value for
3672 lookups and for extractions in the success case. For the ${if item, the string
3673 "true" is substituted. In the fail case, nothing is substituted for all three
3674 items. */
3675
3676 while (isspace(*s)) s++;
3677 if (*s == '}')
3678 {
3679 if (type[0] == 'i')
3680 {
3681 if (yes && !skipping)
3682 *yieldptr = string_catn(*yieldptr, US"true", 4);
3683 }
3684 else
3685 {
3686 if (yes && lookup_value && !skipping)
3687 *yieldptr = string_cat(*yieldptr, lookup_value);
3688 lookup_value = save_lookup;
3689 }
3690 s++;
3691 goto RETURN;
3692 }
3693
3694 /* The first following string must be braced. */
3695
3696 if (*s++ != '{')
3697 {
3698 errwhere = US"'yes' part did not start with '{'";
3699 goto FAILED_CURLY;
3700 }
3701
3702 /* Expand the first substring. Forced failures are noticed only if we actually
3703 want this string. Set skipping in the call in the fail case (this will always
3704 be the case if we were already skipping). */
3705
3706 sub1 = expand_string_internal(s, TRUE, &s, !yes, TRUE, resetok);
3707 if (sub1 == NULL && (yes || !f.expand_string_forcedfail)) goto FAILED;
3708 f.expand_string_forcedfail = FALSE;
3709 if (*s++ != '}')
3710 {
3711 errwhere = US"'yes' part did not end with '}'";
3712 goto FAILED_CURLY;
3713 }
3714
3715 /* If we want the first string, add it to the output */
3716
3717 if (yes)
3718 *yieldptr = string_cat(*yieldptr, sub1);
3719
3720 /* If this is called from a lookup/env or a (cert)extract, we want to restore
3721 $value to what it was at the start of the item, so that it has this value
3722 during the second string expansion. For the call from "if" or "run" to this
3723 function, save_lookup is set to lookup_value, so that this statement does
3724 nothing. */
3725
3726 lookup_value = save_lookup;
3727
3728 /* There now follows either another substring, or "fail", or nothing. This
3729 time, forced failures are noticed only if we want the second string. We must
3730 set skipping in the nested call if we don't want this string, or if we were
3731 already skipping. */
3732
3733 while (isspace(*s)) s++;
3734 if (*s == '{')
3735 {
3736 sub2 = expand_string_internal(s+1, TRUE, &s, yes || skipping, TRUE, resetok);
3737 if (sub2 == NULL && (!yes || !f.expand_string_forcedfail)) goto FAILED;
3738 f.expand_string_forcedfail = FALSE;
3739 if (*s++ != '}')
3740 {
3741 errwhere = US"'no' part did not start with '{'";
3742 goto FAILED_CURLY;
3743 }
3744
3745 /* If we want the second string, add it to the output */
3746
3747 if (!yes)
3748 *yieldptr = string_cat(*yieldptr, sub2);
3749 }
3750
3751 /* If there is no second string, but the word "fail" is present when the use of
3752 the second string is wanted, set a flag indicating it was a forced failure
3753 rather than a syntactic error. Swallow the terminating } in case this is nested
3754 inside another lookup or if or extract. */
3755
3756 else if (*s != '}')
3757 {
3758 uschar name[256];
3759 /* deconst cast ok here as source is s anyway */
3760 s = US read_name(name, sizeof(name), s, US"_");
3761 if (Ustrcmp(name, "fail") == 0)
3762 {
3763 if (!yes && !skipping)
3764 {
3765 while (isspace(*s)) s++;
3766 if (*s++ != '}')
3767 {
3768 errwhere = US"did not close with '}' after forcedfail";
3769 goto FAILED_CURLY;
3770 }
3771 expand_string_message =
3772 string_sprintf("\"%s\" failed and \"fail\" requested", type);
3773 f.expand_string_forcedfail = TRUE;
3774 goto FAILED;
3775 }
3776 }
3777 else
3778 {
3779 expand_string_message =
3780 string_sprintf("syntax error in \"%s\" item - \"fail\" expected", type);
3781 goto FAILED;
3782 }
3783 }
3784
3785 /* All we have to do now is to check on the final closing brace. */
3786
3787 while (isspace(*s)) s++;
3788 if (*s++ != '}')
3789 {
3790 errwhere = US"did not close with '}'";
3791 goto FAILED_CURLY;
3792 }
3793
3794
3795 RETURN:
3796 /* Update the input pointer value before returning */
3797 *sptr = s;
3798 return rc;
3799
3800 FAILED_CURLY:
3801 /* Get here if there is a bracketing failure */
3802 expand_string_message = string_sprintf(
3803 "curly-bracket problem in conditional yes/no parsing: %s\n"
3804 " remaining string is '%s'", errwhere, --s);
3805 rc = 2;
3806 goto RETURN;
3807
3808 FAILED:
3809 /* Get here for other failures */
3810 rc = 1;
3811 goto RETURN;
3812 }
3813
3814
3815
3816
3817 /********************************************************
3818 * prvs: Get last three digits of days since Jan 1, 1970 *
3819 ********************************************************/
3820
3821 /* This is needed to implement the "prvs" BATV reverse
3822 path signing scheme
3823
3824 Argument: integer "days" offset to add or substract to
3825 or from the current number of days.
3826
3827 Returns: pointer to string containing the last three
3828 digits of the number of days since Jan 1, 1970,
3829 modified by the offset argument, NULL if there
3830 was an error in the conversion.
3831
3832 */
3833
3834 static uschar *
3835 prvs_daystamp(int day_offset)
3836 {
3837 uschar *days = store_get(32, FALSE); /* Need at least 24 for cases */
3838 (void)string_format(days, 32, TIME_T_FMT, /* where TIME_T_FMT is %lld */
3839 (time(NULL) + day_offset*86400)/86400);
3840 return (Ustrlen(days) >= 3) ? &days[Ustrlen(days)-3] : US"100";
3841 }
3842
3843
3844
3845 /********************************************************
3846 * prvs: perform HMAC-SHA1 computation of prvs bits *
3847 ********************************************************/
3848
3849 /* This is needed to implement the "prvs" BATV reverse
3850 path signing scheme
3851
3852 Arguments:
3853 address RFC2821 Address to use
3854 key The key to use (must be less than 64 characters
3855 in size)
3856 key_num Single-digit key number to use. Defaults to
3857 '0' when NULL.
3858
3859 Returns: pointer to string containing the first three
3860 bytes of the final hash in hex format, NULL if
3861 there was an error in the process.
3862 */
3863
3864 static uschar *
3865 prvs_hmac_sha1(uschar *address, uschar *key, uschar *key_num, uschar *daystamp)
3866 {
3867 gstring * hash_source;
3868 uschar * p;
3869 hctx h;
3870 uschar innerhash[20];
3871 uschar finalhash[20];
3872 uschar innerkey[64];
3873 uschar outerkey[64];
3874 uschar *finalhash_hex;
3875
3876 if (!key_num)
3877 key_num = US"0";
3878
3879 if (Ustrlen(key) > 64)
3880 return NULL;
3881
3882 hash_source = string_catn(NULL, key_num, 1);
3883 hash_source = string_catn(hash_source, daystamp, 3);
3884 hash_source = string_cat(hash_source, address);
3885 (void) string_from_gstring(hash_source);
3886
3887 DEBUG(D_expand)
3888 debug_printf_indent("prvs: hash source is '%s'\n", hash_source->s);
3889
3890 memset(innerkey, 0x36, 64);
3891 memset(outerkey, 0x5c, 64);
3892
3893 for (int i = 0; i < Ustrlen(key); i++)
3894 {
3895 innerkey[i] ^= key[i];
3896 outerkey[i] ^= key[i];
3897 }
3898
3899 chash_start(HMAC_SHA1, &h);
3900 chash_mid(HMAC_SHA1, &h, innerkey);
3901 chash_end(HMAC_SHA1, &h, hash_source->s, hash_source->ptr, innerhash);
3902
3903 chash_start(HMAC_SHA1, &h);
3904 chash_mid(HMAC_SHA1, &h, outerkey);
3905 chash_end(HMAC_SHA1, &h, innerhash, 20, finalhash);
3906
3907 /* Hashing is deemed sufficient to de-taint any input data */
3908
3909 p = finalhash_hex = store_get(40, FALSE);
3910 for (int i = 0; i < 3; i++)
3911 {
3912 *p++ = hex_digits[(finalhash[i] & 0xf0) >> 4];
3913 *p++ = hex_digits[finalhash[i] & 0x0f];
3914 }
3915 *p = '\0';
3916
3917 return finalhash_hex;
3918 }
3919
3920
3921
3922
3923 /*************************************************
3924 * Join a file onto the output string *
3925 *************************************************/
3926
3927 /* This is used for readfile/readsock and after a run expansion.
3928 It joins the contents of a file onto the output string, globally replacing
3929 newlines with a given string (optionally).
3930
3931 Arguments:
3932 f the FILE
3933 yield pointer to the expandable string struct
3934 eol newline replacement string, or NULL
3935
3936 Returns: new pointer for expandable string, terminated if non-null
3937 */
3938
3939 static gstring *
3940 cat_file(FILE *f, gstring *yield, uschar *eol)
3941 {
3942 uschar buffer[1024];
3943
3944 while (Ufgets(buffer, sizeof(buffer), f))
3945 {
3946 int len = Ustrlen(buffer);
3947 if (eol && buffer[len-1] == '\n') len--;
3948 yield = string_catn(yield, buffer, len);
3949 if (eol && buffer[len])
3950 yield = string_cat(yield, eol);
3951 }
3952
3953 (void) string_from_gstring(yield);
3954 return yield;
3955 }
3956
3957
3958 #ifndef DISABLE_TLS
3959 static gstring *
3960 cat_file_tls(void * tls_ctx, gstring * yield, uschar * eol)
3961 {
3962 int rc;
3963 uschar buffer[1024];
3964
3965 /*XXX could we read direct into a pre-grown string? */
3966
3967 while ((rc = tls_read(tls_ctx, buffer, sizeof(buffer))) > 0)
3968 for (uschar * s = buffer; rc--; s++)
3969 yield = eol && *s == '\n'
3970 ? string_cat(yield, eol) : string_catn(yield, s, 1);
3971
3972 /* We assume that all errors, and any returns of zero bytes,
3973 are actually EOF. */
3974
3975 (void) string_from_gstring(yield);
3976 return yield;
3977 }
3978 #endif
3979
3980
3981 /*************************************************
3982 * Evaluate numeric expression *
3983 *************************************************/
3984
3985 /* This is a set of mutually recursive functions that evaluate an arithmetic
3986 expression involving + - * / % & | ^ ~ << >> and parentheses. The only one of
3987 these functions that is called from elsewhere is eval_expr, whose interface is:
3988
3989 Arguments:
3990 sptr pointer to the pointer to the string - gets updated
3991 decimal TRUE if numbers are to be assumed decimal
3992 error pointer to where to put an error message - must be NULL on input
3993 endket TRUE if ')' must terminate - FALSE for external call
3994
3995 Returns: on success: the value of the expression, with *error still NULL
3996 on failure: an undefined value, with *error = a message
3997 */
3998
3999 static int_eximarith_t eval_op_or(uschar **, BOOL, uschar **);
4000
4001
4002 static int_eximarith_t
4003 eval_expr(uschar **sptr, BOOL decimal, uschar **error, BOOL endket)
4004 {
4005 uschar *s = *sptr;
4006 int_eximarith_t x = eval_op_or(&s, decimal, error);
4007
4008 if (!*error)
4009 if (endket)
4010 if (*s != ')')
4011 *error = US"expecting closing parenthesis";
4012 else
4013 while (isspace(*(++s)));
4014 else if (*s)
4015 *error = US"expecting operator";
4016 *sptr = s;
4017 return x;
4018 }
4019
4020
4021 static int_eximarith_t
4022 eval_number(uschar **sptr, BOOL decimal, uschar **error)
4023 {
4024 int c;
4025 int_eximarith_t n;
4026 uschar *s = *sptr;
4027
4028 if (isdigit((c = Uskip_whitespace(&s))))
4029 {
4030 int count;
4031 (void)sscanf(CS s, (decimal? SC_EXIM_DEC "%n" : SC_EXIM_ARITH "%n"), &n, &count);
4032 s += count;
4033 switch (tolower(*s))
4034 {
4035 default: break;
4036 case 'k': n *= 1024; s++; break;
4037 case 'm': n *= 1024*1024; s++; break;
4038 case 'g': n *= 1024*1024*1024; s++; break;
4039 }
4040 Uskip_whitespace(&s);
4041 }
4042 else if (c == '(')
4043 {
4044 s++;
4045 n = eval_expr(&s, decimal, error, 1);
4046 }
4047 else
4048 {
4049 *error = US"expecting number or opening parenthesis";
4050 n = 0;
4051 }
4052 *sptr = s;
4053 return n;
4054 }
4055
4056
4057 static int_eximarith_t
4058 eval_op_unary(uschar **sptr, BOOL decimal, uschar **error)
4059 {
4060 uschar *s = *sptr;
4061 int_eximarith_t x;
4062 Uskip_whitespace(&s);
4063 if (*s == '+' || *s == '-' || *s == '~')
4064 {
4065 int op = *s++;
4066 x = eval_op_unary(&s, decimal, error);
4067 if (op == '-') x = -x;
4068 else if (op == '~') x = ~x;
4069 }
4070 else
4071 x = eval_number(&s, decimal, error);
4072
4073 *sptr = s;
4074 return x;
4075 }
4076
4077
4078 static int_eximarith_t
4079 eval_op_mult(uschar **sptr, BOOL decimal, uschar **error)
4080 {
4081 uschar *s = *sptr;
4082 int_eximarith_t x = eval_op_unary(&s, decimal, error);
4083 if (!*error)
4084 {
4085 while (*s == '*' || *s == '/' || *s == '%')
4086 {
4087 int op = *s++;
4088 int_eximarith_t y = eval_op_unary(&s, decimal, error);
4089 if (*error) break;
4090 /* SIGFPE both on div/mod by zero and on INT_MIN / -1, which would give
4091 * a value of INT_MAX+1. Note that INT_MIN * -1 gives INT_MIN for me, which
4092 * is a bug somewhere in [gcc 4.2.1, FreeBSD, amd64]. In fact, -N*-M where
4093 * -N*M is INT_MIN will yield INT_MIN.
4094 * Since we don't support floating point, this is somewhat simpler.
4095 * Ideally, we'd return an error, but since we overflow for all other
4096 * arithmetic, consistency suggests otherwise, but what's the correct value
4097 * to use? There is none.
4098 * The C standard guarantees overflow for unsigned arithmetic but signed
4099 * overflow invokes undefined behaviour; in practice, this is overflow
4100 * except for converting INT_MIN to INT_MAX+1. We also can't guarantee
4101 * that long/longlong larger than int are available, or we could just work
4102 * with larger types. We should consider whether to guarantee 32bit eval
4103 * and 64-bit working variables, with errors returned. For now ...
4104 * So, the only SIGFPEs occur with a non-shrinking div/mod, thus -1; we
4105 * can just let the other invalid results occur otherwise, as they have
4106 * until now. For this one case, we can coerce.
4107 */
4108 if (y == -1 && x == EXIM_ARITH_MIN && op != '*')
4109 {
4110 DEBUG(D_expand)
4111 debug_printf("Integer exception dodging: " PR_EXIM_ARITH "%c-1 coerced to " PR_EXIM_ARITH "\n",
4112 EXIM_ARITH_MIN, op, EXIM_ARITH_MAX);
4113 x = EXIM_ARITH_MAX;
4114 continue;
4115 }
4116 if (op == '*')
4117 x *= y;
4118 else
4119 {
4120 if (y == 0)
4121 {
4122 *error = (op == '/') ? US"divide by zero" : US"modulo by zero";
4123 x = 0;
4124 break;
4125 }
4126 if (op == '/')
4127 x /= y;
4128 else
4129 x %= y;
4130 }
4131 }
4132 }
4133 *sptr = s;
4134 return x;
4135 }
4136
4137
4138 static int_eximarith_t
4139 eval_op_sum(uschar **sptr, BOOL decimal, uschar **error)
4140 {
4141 uschar *s = *sptr;
4142 int_eximarith_t x = eval_op_mult(&s, decimal, error);
4143 if (!*error)
4144 {
4145 while (*s == '+' || *s == '-')
4146 {
4147 int op = *s++;
4148 int_eximarith_t y = eval_op_mult(&s, decimal, error);
4149 if (*error) break;
4150 if ( (x >= EXIM_ARITH_MAX/2 && x >= EXIM_ARITH_MAX/2)
4151 || (x <= -(EXIM_ARITH_MAX/2) && y <= -(EXIM_ARITH_MAX/2)))
4152 { /* over-conservative check */
4153 *error = op == '+'
4154 ? US"overflow in sum" : US"overflow in difference";
4155 break;
4156 }
4157 if (op == '+') x += y; else x -= y;
4158 }
4159 }
4160 *sptr = s;
4161 return x;
4162 }
4163
4164
4165 static int_eximarith_t
4166 eval_op_shift(uschar **sptr, BOOL decimal, uschar **error)
4167 {
4168 uschar *s = *sptr;
4169 int_eximarith_t x = eval_op_sum(&s, decimal, error);
4170 if (!*error)
4171 {
4172 while ((*s == '<' || *s == '>') && s[1] == s[0])
4173 {
4174 int_eximarith_t y;
4175 int op = *s++;
4176 s++;
4177 y = eval_op_sum(&s, decimal, error);
4178 if (*error) break;
4179 if (op == '<') x <<= y; else x >>= y;
4180 }
4181 }
4182 *sptr = s;
4183 return x;
4184 }
4185
4186
4187 static int_eximarith_t
4188 eval_op_and(uschar **sptr, BOOL decimal, uschar **error)
4189 {
4190 uschar *s = *sptr;
4191 int_eximarith_t x = eval_op_shift(&s, decimal, error);
4192 if (!*error)
4193 {
4194 while (*s == '&')
4195 {
4196 int_eximarith_t y;
4197 s++;
4198 y = eval_op_shift(&s, decimal, error);
4199 if (*error) break;
4200 x &= y;
4201 }
4202 }
4203 *sptr = s;
4204 return x;
4205 }
4206
4207
4208 static int_eximarith_t
4209 eval_op_xor(uschar **sptr, BOOL decimal, uschar **error)
4210 {
4211 uschar *s = *sptr;
4212 int_eximarith_t x = eval_op_and(&s, decimal, error);
4213 if (!*error)
4214 {
4215 while (*s == '^')
4216 {
4217 int_eximarith_t y;
4218 s++;
4219 y = eval_op_and(&s, decimal, error);
4220 if (*error) break;
4221 x ^= y;
4222 }
4223 }
4224 *sptr = s;
4225 return x;
4226 }
4227
4228
4229 static int_eximarith_t
4230 eval_op_or(uschar **sptr, BOOL decimal, uschar **error)
4231 {
4232 uschar *s = *sptr;
4233 int_eximarith_t x = eval_op_xor(&s, decimal, error);
4234 if (!*error)
4235 {
4236 while (*s == '|')
4237 {
4238 int_eximarith_t y;
4239 s++;
4240 y = eval_op_xor(&s, decimal, error);
4241 if (*error) break;
4242 x |= y;
4243 }
4244 }
4245 *sptr = s;
4246 return x;
4247 }
4248
4249
4250
4251 /************************************************/
4252 /* Comparison operation for sort expansion. We need to avoid
4253 re-expanding the fields being compared, so need a custom routine.
4254
4255 Arguments:
4256 cond_type Comparison operator code
4257 leftarg, rightarg Arguments for comparison
4258
4259 Return true iff (leftarg compare rightarg)
4260 */
4261
4262 static BOOL
4263 sortsbefore(int cond_type, BOOL alpha_cond,
4264 const uschar * leftarg, const uschar * rightarg)
4265 {
4266 int_eximarith_t l_num, r_num;
4267
4268 if (!alpha_cond)
4269 {
4270 l_num = expanded_string_integer(leftarg, FALSE);
4271 if (expand_string_message) return FALSE;
4272 r_num = expanded_string_integer(rightarg, FALSE);
4273 if (expand_string_message) return FALSE;
4274
4275 switch (cond_type)
4276 {
4277 case ECOND_NUM_G: return l_num > r_num;
4278 case ECOND_NUM_GE: return l_num >= r_num;
4279 case ECOND_NUM_L: return l_num < r_num;
4280 case ECOND_NUM_LE: return l_num <= r_num;
4281 default: break;
4282 }
4283 }
4284 else
4285 switch (cond_type)
4286 {
4287 case ECOND_STR_LT: return Ustrcmp (leftarg, rightarg) < 0;
4288 case ECOND_STR_LTI: return strcmpic(leftarg, rightarg) < 0;
4289 case ECOND_STR_LE: return Ustrcmp (leftarg, rightarg) <= 0;
4290 case ECOND_STR_LEI: return strcmpic(leftarg, rightarg) <= 0;
4291 case ECOND_STR_GT: return Ustrcmp (leftarg, rightarg) > 0;
4292 case ECOND_STR_GTI: return strcmpic(leftarg, rightarg) > 0;
4293 case ECOND_STR_GE: return Ustrcmp (leftarg, rightarg) >= 0;
4294 case ECOND_STR_GEI: return strcmpic(leftarg, rightarg) >= 0;
4295 default: break;
4296 }
4297 return FALSE; /* should not happen */
4298 }
4299
4300
4301 /*************************************************
4302 * Expand string *
4303 *************************************************/
4304
4305 /* Returns either an unchanged string, or the expanded string in stacking pool
4306 store. Interpreted sequences are:
4307
4308 \... normal escaping rules
4309 $name substitutes the variable
4310 ${name} ditto
4311 ${op:string} operates on the expanded string value
4312 ${item{arg1}{arg2}...} expands the args and then does the business
4313 some literal args are not enclosed in {}
4314
4315 There are now far too many operators and item types to make it worth listing
4316 them here in detail any more.
4317
4318 We use an internal routine recursively to handle embedded substrings. The
4319 external function follows. The yield is NULL if the expansion failed, and there
4320 are two cases: if something collapsed syntactically, or if "fail" was given
4321 as the action on a lookup failure. These can be distinguished by looking at the
4322 variable expand_string_forcedfail, which is TRUE in the latter case.
4323
4324 The skipping flag is set true when expanding a substring that isn't actually
4325 going to be used (after "if" or "lookup") and it prevents lookups from
4326 happening lower down.
4327
4328 Store usage: At start, a store block of the length of the input plus 64
4329 is obtained. This is expanded as necessary by string_cat(), which might have to
4330 get a new block, or might be able to expand the original. At the end of the
4331 function we can release any store above that portion of the yield block that
4332 was actually used. In many cases this will be optimal.
4333
4334 However: if the first item in the expansion is a variable name or header name,
4335 we reset the store before processing it; if the result is in fresh store, we
4336 use that without copying. This is helpful for expanding strings like
4337 $message_headers which can get very long.
4338
4339 There's a problem if a ${dlfunc item has side-effects that cause allocation,
4340 since resetting the store at the end of the expansion will free store that was
4341 allocated by the plugin code as well as the slop after the expanded string. So
4342 we skip any resets if ${dlfunc } has been used. The same applies for ${acl }
4343 and, given the acl condition, ${if }. This is an unfortunate consequence of
4344 string expansion becoming too powerful.
4345
4346 Arguments:
4347 string the string to be expanded
4348 ket_ends true if expansion is to stop at }
4349 left if not NULL, a pointer to the first character after the
4350 expansion is placed here (typically used with ket_ends)
4351 skipping TRUE for recursive calls when the value isn't actually going
4352 to be used (to allow for optimisation)
4353 honour_dollar TRUE if $ is to be expanded,
4354 FALSE if it's just another character
4355 resetok_p if not NULL, pointer to flag - write FALSE if unsafe to reset
4356 the store.
4357
4358 Returns: NULL if expansion fails:
4359 expand_string_forcedfail is set TRUE if failure was forced
4360 expand_string_message contains a textual error message
4361 a pointer to the expanded string on success
4362 */
4363
4364 static uschar *
4365 expand_string_internal(const uschar *string, BOOL ket_ends, const uschar **left,
4366 BOOL skipping, BOOL honour_dollar, BOOL *resetok_p)
4367 {
4368 rmark reset_point = store_mark();
4369 gstring * yield = string_get(Ustrlen(string) + 64);
4370 int item_type;
4371 const uschar *s = string;
4372 uschar *save_expand_nstring[EXPAND_MAXN+1];
4373 int save_expand_nlength[EXPAND_MAXN+1];
4374 BOOL resetok = TRUE;
4375
4376 expand_level++;
4377 DEBUG(D_expand)
4378 DEBUG(D_noutf8)
4379 debug_printf_indent("/%s: %s\n",
4380 skipping ? "---scanning" : "considering", string);
4381 else
4382 debug_printf_indent(UTF8_DOWN_RIGHT "%s: %s\n",
4383 skipping
4384 ? UTF8_HORIZ UTF8_HORIZ UTF8_HORIZ "scanning"
4385 : "considering",
4386 string);
4387
4388 f.expand_string_forcedfail = FALSE;
4389 expand_string_message = US"";
4390
4391 if (is_tainted(string))
4392 {
4393 expand_string_message =
4394 string_sprintf("attempt to expand tainted string '%s'", s);
4395 log_write(0, LOG_MAIN|LOG_PANIC, "%s", expand_string_message);
4396 goto EXPAND_FAILED;
4397 }
4398
4399 while (*s != 0)
4400 {
4401 uschar *value;
4402 uschar name[256];
4403
4404 /* \ escapes the next character, which must exist, or else
4405 the expansion fails. There's a special escape, \N, which causes
4406 copying of the subject verbatim up to the next \N. Otherwise,
4407 the escapes are the standard set. */
4408
4409 if (*s == '\\')
4410 {
4411 if (s[1] == 0)
4412 {
4413 expand_string_message = US"\\ at end of string";
4414 goto EXPAND_FAILED;
4415 }
4416
4417 if (s[1] == 'N')
4418 {
4419 const uschar * t = s + 2;
4420 for (s = t; *s != 0; s++) if (*s == '\\' && s[1] == 'N') break;
4421 yield = string_catn(yield, t, s - t);
4422 if (*s != 0) s += 2;
4423 }
4424
4425 else
4426 {
4427 uschar ch[1];
4428 ch[0] = string_interpret_escape(&s);
4429 s++;
4430 yield = string_catn(yield, ch, 1);
4431 }
4432
4433 continue;
4434 }
4435
4436 /*{*/
4437 /* Anything other than $ is just copied verbatim, unless we are
4438 looking for a terminating } character. */
4439
4440 /*{*/
4441 if (ket_ends && *s == '}') break;
4442
4443 if (*s != '$' || !honour_dollar)
4444 {
4445 yield = string_catn(yield, s++, 1);
4446 continue;
4447 }
4448
4449 /* No { after the $ - must be a plain name or a number for string
4450 match variable. There has to be a fudge for variables that are the
4451 names of header fields preceded by "$header_" because header field
4452 names can contain any printing characters except space and colon.
4453 For those that don't like typing this much, "$h_" is a synonym for
4454 "$header_". A non-existent header yields a NULL value; nothing is
4455 inserted. */ /*}*/
4456
4457 if (isalpha((*(++s))))
4458 {
4459 int len;
4460 int newsize = 0;
4461 gstring * g = NULL;
4462 uschar * t;
4463
4464 s = read_name(name, sizeof(name), s, US"_");
4465
4466 /* If this is the first thing to be expanded, release the pre-allocated
4467 buffer. */
4468
4469 if (!yield)
4470 g = store_get(sizeof(gstring), FALSE);
4471 else if (yield->ptr == 0)
4472 {
4473 if (resetok) reset_point = store_reset(reset_point);
4474 yield = NULL;
4475 reset_point = store_mark();
4476 g = store_get(sizeof(gstring), FALSE); /* alloc _before_ calling find_variable() */
4477 }
4478
4479 /* Header */
4480
4481 if ( ( *(t = name) == 'h'
4482 || (*t == 'r' || *t == 'l' || *t == 'b') && *++t == 'h'
4483 )
4484 && (*++t == '_' || Ustrncmp(t, "eader_", 6) == 0)
4485 )
4486 {
4487 unsigned flags = *name == 'r' ? FH_WANT_RAW
4488 : *name == 'l' ? FH_WANT_RAW|FH_WANT_LIST
4489 : 0;
4490 uschar * charset = *name == 'b' ? NULL : headers_charset;
4491
4492 s = read_header_name(name, sizeof(name), s);
4493 value = find_header(name, &newsize, flags, charset);
4494
4495 /* If we didn't find the header, and the header contains a closing brace
4496 character, this may be a user error where the terminating colon
4497 has been omitted. Set a flag to adjust the error message in this case.
4498 But there is no error here - nothing gets inserted. */
4499
4500 if (!value)
4501 {
4502 if (Ustrchr(name, '}')) malformed_header = TRUE;
4503 continue;
4504 }
4505 }
4506
4507 /* Variable */
4508
4509 else if (!(value = find_variable(name, FALSE, skipping, &newsize)))
4510 {
4511 expand_string_message =
4512 string_sprintf("unknown variable name \"%s\"", name);
4513 check_variable_error_message(name);
4514 goto EXPAND_FAILED;
4515 }
4516
4517 /* If the data is known to be in a new buffer, newsize will be set to the
4518 size of that buffer. If this is the first thing in an expansion string,
4519 yield will be NULL; just point it at the new store instead of copying. Many
4520 expansion strings contain just one reference, so this is a useful
4521 optimization, especially for humungous headers. We need to use a gstring
4522 structure that is not allocated after that new-buffer, else a later store
4523 reset in the middle of the buffer will make it inaccessible. */
4524
4525 len = Ustrlen(value);
4526 if (!yield && newsize != 0)
4527 {
4528 yield = g;
4529 yield->size = newsize;
4530 yield->ptr = len;
4531 yield->s = value;
4532 }
4533 else
4534 yield = string_catn(yield, value, len);
4535
4536 continue;
4537 }
4538
4539 if (isdigit(*s))
4540 {
4541 int n;
4542 s = read_cnumber(&n, s);
4543 if (n >= 0 && n <= expand_nmax)
4544 yield = string_catn(yield, expand_nstring[n], expand_nlength[n]);
4545 continue;
4546 }
4547
4548 /* Otherwise, if there's no '{' after $ it's an error. */ /*}*/
4549
4550 if (*s != '{') /*}*/
4551 {
4552 expand_string_message = US"$ not followed by letter, digit, or {"; /*}*/
4553 goto EXPAND_FAILED;
4554 }
4555
4556 /* After { there can be various things, but they all start with
4557 an initial word, except for a number for a string match variable. */
4558
4559 if (isdigit((*(++s))))
4560 {
4561 int n;
4562 s = read_cnumber(&n, s); /*{*/
4563 if (*s++ != '}')
4564 { /*{*/
4565 expand_string_message = US"} expected after number";
4566 goto EXPAND_FAILED;
4567 }
4568 if (n >= 0 && n <= expand_nmax)
4569 yield = string_catn(yield, expand_nstring[n], expand_nlength[n]);
4570 continue;
4571 }
4572
4573 if (!isalpha(*s))
4574 {
4575 expand_string_message = US"letter or digit expected after ${"; /*}*/
4576 goto EXPAND_FAILED;
4577 }
4578
4579 /* Allow "-" in names to cater for substrings with negative
4580 arguments. Since we are checking for known names after { this is
4581 OK. */
4582
4583 s = read_name(name, sizeof(name), s, US"_-");
4584 item_type = chop_match(name, item_table, nelem(item_table));
4585
4586 switch(item_type)
4587 {
4588 /* Call an ACL from an expansion. We feed data in via $acl_arg1 - $acl_arg9.
4589 If the ACL returns accept or reject we return content set by "message ="
4590 There is currently no limit on recursion; this would have us call
4591 acl_check_internal() directly and get a current level from somewhere.
4592 See also the acl expansion condition ECOND_ACL and the traditional
4593 acl modifier ACLC_ACL.
4594 Assume that the function has side-effects on the store that must be preserved.
4595 */
4596
4597 case EITEM_ACL:
4598 /* ${acl {name} {arg1}{arg2}...} */
4599 {
4600 uschar *sub[10]; /* name + arg1-arg9 (which must match number of acl_arg[]) */
4601 uschar *user_msg;
4602 int rc;
4603
4604 switch(read_subs(sub, nelem(sub), 1, &s, skipping, TRUE, name,
4605 &resetok))
4606 {
4607 case 1: goto EXPAND_FAILED_CURLY;
4608 case 2:
4609 case 3: goto EXPAND_FAILED;
4610 }
4611 if (skipping) continue;
4612
4613 resetok = FALSE;
4614 switch(rc = eval_acl(sub, nelem(sub), &user_msg))
4615 {
4616 case OK:
4617 case FAIL:
4618 DEBUG(D_expand)
4619 debug_printf_indent("acl expansion yield: %s\n", user_msg);
4620 if (user_msg)
4621 yield = string_cat(yield, user_msg);
4622 continue;
4623
4624 case DEFER:
4625 f.expand_string_forcedfail = TRUE;
4626 /*FALLTHROUGH*/
4627 default:
4628 expand_string_message = string_sprintf("%s from acl \"%s\"",
4629 rc_names[rc], sub[0]);
4630 goto EXPAND_FAILED;
4631 }
4632 }
4633
4634 case EITEM_AUTHRESULTS:
4635 /* ${authresults {mysystemname}} */
4636 {
4637 uschar *sub_arg[1];
4638
4639 switch(read_subs(sub_arg, nelem(sub_arg), 1, &s, skipping, TRUE, name,
4640 &resetok))
4641 {
4642 case 1: goto EXPAND_FAILED_CURLY;
4643 case 2:
4644 case 3: goto EXPAND_FAILED;
4645 }
4646
4647 yield = string_append(yield, 3,
4648 US"Authentication-Results: ", sub_arg[0], US"; none");
4649 yield->ptr -= 6;
4650
4651 yield = authres_local(yield, sub_arg[0]);
4652 yield = authres_iprev(yield);
4653 yield = authres_smtpauth(yield);
4654 #ifdef SUPPORT_SPF
4655 yield = authres_spf(yield);
4656 #endif
4657 #ifndef DISABLE_DKIM
4658 yield = authres_dkim(yield);
4659 #endif
4660 #ifdef SUPPORT_DMARC
4661 yield = authres_dmarc(yield);
4662 #endif
4663 #ifdef EXPERIMENTAL_ARC
4664 yield = authres_arc(yield);
4665 #endif
4666 continue;
4667 }
4668
4669 /* Handle conditionals - preserve the values of the numerical expansion
4670 variables in case they get changed by a regular expression match in the
4671 condition. If not, they retain their external settings. At the end
4672 of this "if" section, they get restored to their previous values. */
4673
4674 case EITEM_IF:
4675 {
4676 BOOL cond = FALSE;
4677 const uschar *next_s;
4678 int save_expand_nmax =
4679 save_expand_strings(save_expand_nstring, save_expand_nlength);
4680
4681 while (isspace(*s)) s++;
4682 if (!(next_s = eval_condition(s, &resetok, skipping ? NULL : &cond)))
4683 goto EXPAND_FAILED; /* message already set */
4684
4685 DEBUG(D_expand)
4686 DEBUG(D_noutf8)
4687 {
4688 debug_printf_indent("|--condition: %.*s\n", (int)(next_s - s), s);
4689 debug_printf_indent("|-----result: %s\n", cond ? "true" : "false");
4690 }
4691 else
4692 {
4693 debug_printf_indent(UTF8_VERT_RIGHT UTF8_HORIZ UTF8_HORIZ
4694 "condition: %.*s\n",
4695 (int)(next_s - s), s);
4696 debug_printf_indent(UTF8_VERT_RIGHT UTF8_HORIZ UTF8_HORIZ
4697 UTF8_HORIZ UTF8_HORIZ UTF8_HORIZ
4698 "result: %s\n",
4699 cond ? "true" : "false");
4700 }
4701
4702 s = next_s;
4703
4704 /* The handling of "yes" and "no" result strings is now in a separate
4705 function that is also used by ${lookup} and ${extract} and ${run}. */
4706
4707 switch(process_yesno(
4708 skipping, /* were previously skipping */
4709 cond, /* success/failure indicator */
4710 lookup_value, /* value to reset for string2 */
4711 &s, /* input pointer */
4712 &yield, /* output pointer */
4713 US"if", /* condition type */
4714 &resetok))
4715 {
4716 case 1: goto EXPAND_FAILED; /* when all is well, the */
4717 case 2: goto EXPAND_FAILED_CURLY; /* returned value is 0 */
4718 }
4719
4720 /* Restore external setting of expansion variables for continuation
4721 at this level. */
4722
4723 restore_expand_strings(save_expand_nmax, save_expand_nstring,
4724 save_expand_nlength);
4725 continue;
4726 }
4727
4728 #ifdef SUPPORT_I18N
4729 case EITEM_IMAPFOLDER:
4730 { /* ${imapfolder {name}{sep]{specials}} */
4731 uschar *sub_arg[3];
4732 uschar *encoded;
4733
4734 switch(read_subs(sub_arg, nelem(sub_arg), 1, &s, skipping, TRUE, name,
4735 &resetok))
4736 {
4737 case 1: goto EXPAND_FAILED_CURLY;
4738 case 2:
4739 case 3: goto EXPAND_FAILED;
4740 }
4741
4742 if (!sub_arg[1]) /* One argument */
4743 {
4744 sub_arg[1] = US"/"; /* default separator */
4745 sub_arg[2] = NULL;
4746 }
4747 else if (Ustrlen(sub_arg[1]) != 1)
4748 {
4749 expand_string_message =
4750 string_sprintf(
4751 "IMAP folder separator must be one character, found \"%s\"",
4752 sub_arg[1]);
4753 goto EXPAND_FAILED;
4754 }
4755
4756 if (!skipping)
4757 {
4758 if (!(encoded = imap_utf7_encode(sub_arg[0], headers_charset,
4759 sub_arg[1][0], sub_arg[2], &expand_string_message)))
4760 goto EXPAND_FAILED;
4761 yield = string_cat(yield, encoded);
4762 }
4763 continue;
4764 }
4765 #endif
4766
4767 /* Handle database lookups unless locked out. If "skipping" is TRUE, we are
4768 expanding an internal string that isn't actually going to be used. All we
4769 need to do is check the syntax, so don't do a lookup at all. Preserve the
4770 values of the numerical expansion variables in case they get changed by a
4771 partial lookup. If not, they retain their external settings. At the end
4772 of this "lookup" section, they get restored to their previous values. */
4773
4774 case EITEM_LOOKUP:
4775 {
4776 int stype, partial, affixlen, starflags;
4777 int expand_setup = 0;
4778 int nameptr = 0;
4779 uschar *key, *filename;
4780 const uschar * affix, * opts;
4781 uschar *save_lookup_value = lookup_value;
4782 int save_expand_nmax =
4783 save_expand_strings(save_expand_nstring, save_expand_nlength);
4784
4785 if ((expand_forbid & RDO_LOOKUP) != 0)
4786 {
4787 expand_string_message = US"lookup expansions are not permitted";
4788 goto EXPAND_FAILED;
4789 }
4790
4791 /* Get the key we are to look up for single-key+file style lookups.
4792 Otherwise set the key NULL pro-tem. */
4793
4794 while (isspace(*s)) s++;
4795 if (*s == '{') /*}*/
4796 {
4797 key = expand_string_internal(s+1, TRUE, &s, skipping, TRUE, &resetok);
4798 if (!key) goto EXPAND_FAILED; /*{{*/
4799 if (*s++ != '}')
4800 {
4801 expand_string_message = US"missing '}' after lookup key";
4802 goto EXPAND_FAILED_CURLY;
4803 }
4804 while (isspace(*s)) s++;
4805 }
4806 else key = NULL;
4807
4808 /* Find out the type of database */
4809
4810 if (!isalpha(*s))
4811 {
4812 expand_string_message = US"missing lookup type";
4813 goto EXPAND_FAILED;
4814 }
4815
4816 /* The type is a string that may contain special characters of various
4817 kinds. Allow everything except space or { to appear; the actual content
4818 is checked by search_findtype_partial. */ /*}*/
4819
4820 while (*s && *s != '{' && !isspace(*s)) /*}*/
4821 {
4822 if (nameptr < sizeof(name) - 1) name[nameptr++] = *s;
4823 s++;
4824 }
4825 name[nameptr] = '\0';
4826 while (isspace(*s)) s++;
4827
4828 /* Now check for the individual search type and any partial or default
4829 options. Only those types that are actually in the binary are valid. */
4830
4831 if ((stype = search_findtype_partial(name, &partial, &affix, &affixlen,
4832 &starflags, &opts)) < 0)
4833 {
4834 expand_string_message = search_error_message;
4835 goto EXPAND_FAILED;
4836 }
4837
4838 /* Check that a key was provided for those lookup types that need it,
4839 and was not supplied for those that use the query style. */
4840
4841 if (!mac_islookup(stype, lookup_querystyle|lookup_absfilequery))
4842 {
4843 if (!key)
4844 {
4845 expand_string_message = string_sprintf("missing {key} for single-"
4846 "key \"%s\" lookup", name);
4847 goto EXPAND_FAILED;
4848 }
4849 }
4850 else
4851 {
4852 if (key)
4853 {
4854 expand_string_message = string_sprintf("a single key was given for "
4855 "lookup type \"%s\", which is not a single-key lookup type", name);
4856 goto EXPAND_FAILED;
4857 }
4858 }
4859
4860 /* Get the next string in brackets and expand it. It is the file name for
4861 single-key+file lookups, and the whole query otherwise. In the case of
4862 queries that also require a file name (e.g. sqlite), the file name comes
4863 first. */
4864
4865 if (*s != '{')
4866 {
4867 expand_string_message = US"missing '{' for lookup file-or-query arg";
4868 goto EXPAND_FAILED_CURLY;
4869 }
4870 if (!(filename = expand_string_internal(s+1, TRUE, &s, skipping, TRUE, &resetok)))
4871 goto EXPAND_FAILED;
4872 if (*s++ != '}')
4873 {
4874 expand_string_message = US"missing '}' closing lookup file-or-query arg";
4875 goto EXPAND_FAILED_CURLY;
4876 }
4877 while (isspace(*s)) s++;
4878
4879 /* If this isn't a single-key+file lookup, re-arrange the variables
4880 to be appropriate for the search_ functions. For query-style lookups,
4881 there is just a "key", and no file name. For the special query-style +
4882 file types, the query (i.e. "key") starts with a file name. */
4883
4884 if (!key)
4885 {
4886 while (isspace(*filename)) filename++;
4887 key = filename;
4888
4889 if (mac_islookup(stype, lookup_querystyle))
4890 filename = NULL;
4891 else
4892 if (*filename == '/')
4893 {
4894 while (*key && !isspace(*key)) key++;
4895 if (*key) *key++ = '\0';
4896 }
4897 else
4898 filename = NULL;
4899 }
4900
4901 /* If skipping, don't do the next bit - just lookup_value == NULL, as if
4902 the entry was not found. Note that there is no search_close() function.
4903 Files are left open in case of re-use. At suitable places in higher logic,
4904 search_tidyup() is called to tidy all open files. This can save opening
4905 the same file several times. However, files may also get closed when
4906 others are opened, if too many are open at once. The rule is that a
4907 handle should not be used after a second search_open().
4908
4909 Request that a partial search sets up $1 and maybe $2 by passing
4910 expand_setup containing zero. If its value changes, reset expand_nmax,
4911 since new variables will have been set. Note that at the end of this
4912 "lookup" section, the old numeric variables are restored. */
4913
4914 if (skipping)
4915 lookup_value = NULL;
4916 else
4917 {
4918 void *handle = search_open(filename, stype, 0, NULL, NULL);
4919 if (!handle)
4920 {
4921 expand_string_message = search_error_message;
4922 goto EXPAND_FAILED;
4923 }
4924 lookup_value = search_find(handle, filename, key, partial, affix,
4925 affixlen, starflags, &expand_setup, opts);
4926 if (f.search_find_defer)
4927 {
4928 expand_string_message =
4929 string_sprintf("lookup of \"%s\" gave DEFER: %s",
4930 string_printing2(key, FALSE), search_error_message);
4931 goto EXPAND_FAILED;
4932 }
4933 if (expand_setup > 0) expand_nmax = expand_setup;
4934 }
4935
4936 /* The handling of "yes" and "no" result strings is now in a separate
4937 function that is also used by ${if} and ${extract}. */
4938
4939 switch(process_yesno(
4940 skipping, /* were previously skipping */
4941 lookup_value != NULL, /* success/failure indicator */
4942 save_lookup_value, /* value to reset for string2 */
4943 &s, /* input pointer */
4944 &yield, /* output pointer */
4945 US"lookup", /* condition type */
4946 &resetok))
4947 {
4948 case 1: goto EXPAND_FAILED; /* when all is well, the */
4949 case 2: goto EXPAND_FAILED_CURLY; /* returned value is 0 */
4950 }
4951
4952 /* Restore external setting of expansion variables for carrying on
4953 at this level, and continue. */
4954
4955 restore_expand_strings(save_expand_nmax, save_expand_nstring,
4956 save_expand_nlength);
4957 continue;
4958 }
4959
4960 /* If Perl support is configured, handle calling embedded perl subroutines,
4961 unless locked out at this time. Syntax is ${perl{sub}} or ${perl{sub}{arg}}
4962 or ${perl{sub}{arg1}{arg2}} or up to a maximum of EXIM_PERL_MAX_ARGS
4963 arguments (defined below). */
4964
4965 #define EXIM_PERL_MAX_ARGS 8
4966
4967 case EITEM_PERL:
4968 #ifndef EXIM_PERL
4969 expand_string_message = US"\"${perl\" encountered, but this facility " /*}*/
4970 "is not included in this binary";
4971 goto EXPAND_FAILED;
4972
4973 #else /* EXIM_PERL */
4974 {
4975 uschar *sub_arg[EXIM_PERL_MAX_ARGS + 2];
4976 gstring *new_yield;
4977
4978 if ((expand_forbid & RDO_PERL) != 0)
4979 {
4980 expand_string_message = US"Perl calls are not permitted";
4981 goto EXPAND_FAILED;
4982 }
4983
4984 switch(read_subs(sub_arg, EXIM_PERL_MAX_ARGS + 1, 1, &s, skipping, TRUE,
4985 name, &resetok))
4986 {
4987 case 1: goto EXPAND_FAILED_CURLY;
4988 case 2:
4989 case 3: goto EXPAND_FAILED;
4990 }
4991
4992 /* If skipping, we don't actually do anything */
4993
4994 if (skipping) continue;
4995
4996 /* Start the interpreter if necessary */
4997
4998 if (!opt_perl_started)
4999 {
5000 uschar *initerror;
5001 if (!opt_perl_startup)
5002 {
5003 expand_string_message = US"A setting of perl_startup is needed when "
5004 "using the Perl interpreter";
5005 goto EXPAND_FAILED;
5006 }
5007 DEBUG(D_any) debug_printf("Starting Perl interpreter\n");
5008 if ((initerror = init_perl(opt_perl_startup)))
5009 {
5010 expand_string_message =
5011 string_sprintf("error in perl_startup code: %s\n", initerror);
5012 goto EXPAND_FAILED;
5013 }
5014 opt_perl_started = TRUE;
5015 }
5016
5017 /* Call the function */
5018
5019 sub_arg[EXIM_PERL_MAX_ARGS + 1] = NULL;
5020 new_yield = call_perl_cat(yield, &expand_string_message,
5021 sub_arg[0], sub_arg + 1);
5022
5023 /* NULL yield indicates failure; if the message pointer has been set to
5024 NULL, the yield was undef, indicating a forced failure. Otherwise the
5025 message will indicate some kind of Perl error. */
5026
5027 if (!new_yield)
5028 {
5029 if (!expand_string_message)
5030 {
5031 expand_string_message =
5032 string_sprintf("Perl subroutine \"%s\" returned undef to force "
5033 "failure", sub_arg[0]);
5034 f.expand_string_forcedfail = TRUE;
5035 }
5036 goto EXPAND_FAILED;
5037 }
5038
5039 /* Yield succeeded. Ensure forcedfail is unset, just in case it got
5040 set during a callback from Perl. */
5041
5042 f.expand_string_forcedfail = FALSE;
5043 yield = new_yield;
5044 continue;
5045 }
5046 #endif /* EXIM_PERL */
5047
5048 /* Transform email address to "prvs" scheme to use
5049 as BATV-signed return path */
5050
5051 case EITEM_PRVS:
5052 {
5053 uschar *sub_arg[3];
5054 uschar *p,*domain;
5055
5056 switch(read_subs(sub_arg, 3, 2, &s, skipping, TRUE, name, &resetok))
5057 {
5058 case 1: goto EXPAND_FAILED_CURLY;
5059 case 2:
5060 case 3: goto EXPAND_FAILED;
5061 }
5062
5063 /* If skipping, we don't actually do anything */
5064 if (skipping) continue;
5065
5066 /* sub_arg[0] is the address */
5067 if ( !(domain = Ustrrchr(sub_arg[0],'@'))
5068 || domain == sub_arg[0] || Ustrlen(domain) == 1)
5069 {
5070 expand_string_message = US"prvs first argument must be a qualified email address";
5071 goto EXPAND_FAILED;
5072 }
5073
5074 /* Calculate the hash. The third argument must be a single-digit
5075 key number, or unset. */
5076
5077 if ( sub_arg[2]
5078 && (!isdigit(sub_arg[2][0]) || sub_arg[2][1] != 0))
5079 {
5080 expand_string_message = US"prvs third argument must be a single digit";
5081 goto EXPAND_FAILED;
5082 }
5083
5084 p = prvs_hmac_sha1(sub_arg[0], sub_arg[1], sub_arg[2], prvs_daystamp(7));
5085 if (!p)
5086 {
5087 expand_string_message = US"prvs hmac-sha1 conversion failed";
5088 goto EXPAND_FAILED;
5089 }
5090
5091 /* Now separate the domain from the local part */
5092 *domain++ = '\0';
5093
5094 yield = string_catn(yield, US"prvs=", 5);
5095 yield = string_catn(yield, sub_arg[2] ? sub_arg[2] : US"0", 1);
5096 yield = string_catn(yield, prvs_daystamp(7), 3);
5097 yield = string_catn(yield, p, 6);
5098 yield = string_catn(yield, US"=", 1);
5099 yield = string_cat (yield, sub_arg[0]);
5100 yield = string_catn(yield, US"@", 1);
5101 yield = string_cat (yield, domain);
5102
5103 continue;
5104 }
5105
5106 /* Check a prvs-encoded address for validity */
5107
5108 case EITEM_PRVSCHECK:
5109 {
5110 uschar *sub_arg[3];
5111 gstring * g;
5112 const pcre *re;
5113 uschar *p;
5114
5115 /* TF: Ugliness: We want to expand parameter 1 first, then set
5116 up expansion variables that are used in the expansion of
5117 parameter 2. So we clone the string for the first
5118 expansion, where we only expand parameter 1.
5119
5120 PH: Actually, that isn't necessary. The read_subs() function is
5121 designed to work this way for the ${if and ${lookup expansions. I've
5122 tidied the code.
5123 */
5124
5125 /* Reset expansion variables */
5126 prvscheck_result = NULL;
5127 prvscheck_address = NULL;
5128 prvscheck_keynum = NULL;
5129
5130 switch(read_subs(sub_arg, 1, 1, &s, skipping, FALSE, name, &resetok))
5131 {
5132 case 1: goto EXPAND_FAILED_CURLY;
5133 case 2:
5134 case 3: goto EXPAND_FAILED;
5135 }
5136
5137 re = regex_must_compile(US"^prvs\\=([0-9])([0-9]{3})([A-F0-9]{6})\\=(.+)\\@(.+)$",
5138 TRUE,FALSE);
5139
5140 if (regex_match_and_setup(re,sub_arg[0],0,-1))
5141 {
5142 uschar *local_part = string_copyn(expand_nstring[4],expand_nlength[4]);
5143 uschar *key_num = string_copyn(expand_nstring[1],expand_nlength[1]);
5144 uschar *daystamp = string_copyn(expand_nstring[2],expand_nlength[2]);
5145 uschar *hash = string_copyn(expand_nstring[3],expand_nlength[3]);
5146 uschar *domain = string_copyn(expand_nstring[5],expand_nlength[5]);
5147
5148 DEBUG(D_expand) debug_printf_indent("prvscheck localpart: %s\n", local_part);
5149 DEBUG(D_expand) debug_printf_indent("prvscheck key number: %s\n", key_num);
5150 DEBUG(D_expand) debug_printf_indent("prvscheck daystamp: %s\n", daystamp);
5151 DEBUG(D_expand) debug_printf_indent("prvscheck hash: %s\n", hash);
5152 DEBUG(D_expand) debug_printf_indent("prvscheck domain: %s\n", domain);
5153
5154 /* Set up expansion variables */
5155 g = string_cat (NULL, local_part);
5156 g = string_catn(g, US"@", 1);
5157 g = string_cat (g, domain);
5158 prvscheck_address = string_from_gstring(g);
5159 prvscheck_keynum = string_copy(key_num);
5160
5161 /* Now expand the second argument */
5162 switch(read_subs(sub_arg, 1, 1, &s, skipping, FALSE, name, &resetok))
5163 {
5164 case 1: goto EXPAND_FAILED_CURLY;
5165 case 2:
5166 case 3: goto EXPAND_FAILED;
5167 }
5168
5169 /* Now we have the key and can check the address. */
5170
5171 p = prvs_hmac_sha1(prvscheck_address, sub_arg[0], prvscheck_keynum,
5172 daystamp);
5173
5174 if (!p)
5175 {
5176 expand_string_message = US"hmac-sha1 conversion failed";
5177 goto EXPAND_FAILED;
5178 }
5179
5180 DEBUG(D_expand) debug_printf_indent("prvscheck: received hash is %s\n", hash);
5181 DEBUG(D_expand) debug_printf_indent("prvscheck: own hash is %s\n", p);
5182
5183 if (Ustrcmp(p,hash) == 0)
5184 {
5185 /* Success, valid BATV address. Now check the expiry date. */
5186 uschar *now = prvs_daystamp(0);
5187 unsigned int inow = 0,iexpire = 1;
5188
5189 (void)sscanf(CS now,"%u",&inow);
5190 (void)sscanf(CS daystamp,"%u",&iexpire);
5191
5192 /* When "iexpire" is < 7, a "flip" has occurred.
5193 Adjust "inow" accordingly. */
5194 if ( (iexpire < 7) && (inow >= 993) ) inow = 0;
5195
5196 if (iexpire >= inow)
5197 {
5198 prvscheck_result = US"1";
5199 DEBUG(D_expand) debug_printf_indent("prvscheck: success, $pvrs_result set to 1\n");
5200 }
5201 else
5202 {
5203 prvscheck_result = NULL;
5204 DEBUG(D_expand) debug_printf_indent("prvscheck: signature expired, $pvrs_result unset\n");
5205 }
5206 }
5207 else
5208 {
5209 prvscheck_result = NULL;
5210 DEBUG(D_expand) debug_printf_indent("prvscheck: hash failure, $pvrs_result unset\n");
5211 }
5212
5213 /* Now expand the final argument. We leave this till now so that
5214 it can include $prvscheck_result. */
5215
5216 switch(read_subs(sub_arg, 1, 0, &s, skipping, TRUE, name, &resetok))
5217 {
5218 case 1: goto EXPAND_FAILED_CURLY;
5219 case 2:
5220 case 3: goto EXPAND_FAILED;
5221 }
5222
5223 yield = string_cat(yield,
5224 !sub_arg[0] || !*sub_arg[0] ? prvscheck_address : sub_arg[0]);
5225
5226 /* Reset the "internal" variables afterwards, because they are in
5227 dynamic store that will be reclaimed if the expansion succeeded. */
5228
5229 prvscheck_address = NULL;
5230 prvscheck_keynum = NULL;
5231 }
5232 else
5233 /* Does not look like a prvs encoded address, return the empty string.
5234 We need to make sure all subs are expanded first, so as to skip over
5235 the entire item. */
5236
5237 switch(read_subs(sub_arg, 2, 1, &s, skipping, TRUE, name, &resetok))
5238 {
5239 case 1: goto EXPAND_FAILED_CURLY;
5240 case 2:
5241 case 3: goto EXPAND_FAILED;
5242 }
5243
5244 continue;
5245 }
5246
5247 /* Handle "readfile" to insert an entire file */
5248
5249 case EITEM_READFILE:
5250 {
5251 FILE *f;
5252 uschar *sub_arg[2];
5253
5254 if ((expand_forbid & RDO_READFILE) != 0)
5255 {
5256 expand_string_message = US"file insertions are not permitted";
5257 goto EXPAND_FAILED;
5258 }
5259
5260 switch(read_subs(sub_arg, 2, 1, &s, skipping, TRUE, name, &resetok))
5261 {
5262 case 1: goto EXPAND_FAILED_CURLY;
5263 case 2:
5264 case 3: goto EXPAND_FAILED;
5265 }
5266
5267 /* If skipping, we don't actually do anything */
5268
5269 if (skipping) continue;
5270
5271 /* Open the file and read it */
5272
5273 if (!(f = Ufopen(sub_arg[0], "rb")))
5274 {
5275 expand_string_message = string_open_failed(errno, "%s", sub_arg[0]);
5276 goto EXPAND_FAILED;
5277 }
5278
5279 yield = cat_file(f, yield, sub_arg[1]);
5280 (void)fclose(f);
5281 continue;
5282 }
5283
5284 /* Handle "readsocket" to insert data from a socket, either
5285 Inet or Unix domain */
5286
5287 case EITEM_READSOCK:
5288 {
5289 client_conn_ctx cctx;
5290 int timeout = 5;
5291 int save_ptr = gstring_length(yield);
5292 FILE * fp = NULL;
5293 uschar * arg;
5294 uschar * sub_arg[4];
5295 uschar * server_name = NULL;
5296 host_item host;
5297 BOOL do_shutdown = TRUE;
5298 BOOL do_tls = FALSE; /* Only set under ! DISABLE_TLS */
5299 blob reqstr;
5300
5301 if (expand_forbid & RDO_READSOCK)
5302 {
5303 expand_string_message = US"socket insertions are not permitted";
5304 goto EXPAND_FAILED;
5305 }
5306
5307 /* Read up to 4 arguments, but don't do the end of item check afterwards,
5308 because there may be a string for expansion on failure. */
5309
5310 switch(read_subs(sub_arg, 4, 2, &s, skipping, FALSE, name, &resetok))
5311 {
5312 case 1: goto EXPAND_FAILED_CURLY;
5313 case 2: /* Won't occur: no end check */
5314 case 3: goto EXPAND_FAILED;
5315 }
5316
5317 /* Grab the request string, if any */
5318
5319 reqstr.data = sub_arg[1];
5320 reqstr.len = Ustrlen(sub_arg[1]);
5321
5322 /* Sort out timeout, if given. The second arg is a list with the first element
5323 being a time value. Any more are options of form "name=value". Currently the
5324 only option recognised is "shutdown". */
5325
5326 if (sub_arg[2])
5327 {
5328 const uschar * list = sub_arg[2];
5329 uschar * item;
5330 int sep = 0;
5331
5332 if ( !(item = string_nextinlist(&list, &sep, NULL, 0))
5333 || !*item
5334 || (timeout = readconf_readtime(item, 0, FALSE)) < 0)
5335 {
5336 expand_string_message = string_sprintf("bad time value %s", item);
5337 goto EXPAND_FAILED;
5338 }
5339
5340 while ((item = string_nextinlist(&list, &sep, NULL, 0)))
5341 if (Ustrncmp(item, US"shutdown=", 9) == 0)
5342 { if (Ustrcmp(item + 9, US"no") == 0) do_shutdown = FALSE; }
5343 #ifndef DISABLE_TLS
5344 else if (Ustrncmp(item, US"tls=", 4) == 0)
5345 { if (Ustrcmp(item + 9, US"no") != 0) do_tls = TRUE; }
5346 #endif
5347 }
5348 else
5349 sub_arg[3] = NULL; /* No eol if no timeout */
5350
5351 /* If skipping, we don't actually do anything. Otherwise, arrange to
5352 connect to either an IP or a Unix socket. */
5353
5354 if (!skipping)
5355 {
5356 /* Handle an IP (internet) domain */
5357
5358 if (Ustrncmp(sub_arg[0], "inet:", 5) == 0)
5359 {
5360 int port;
5361 uschar * port_name;
5362
5363 server_name = sub_arg[0] + 5;
5364 port_name = Ustrrchr(server_name, ':');
5365
5366 /* Sort out the port */
5367
5368 if (!port_name)
5369 {
5370 expand_string_message =
5371 string_sprintf("missing port for readsocket %s", sub_arg[0]);
5372 goto EXPAND_FAILED;
5373 }
5374 *port_name++ = 0; /* Terminate server name */
5375
5376 if (isdigit(*port_name))
5377 {
5378 uschar *end;
5379 port = Ustrtol(port_name, &end, 0);
5380 if (end != port_name + Ustrlen(port_name))
5381 {
5382 expand_string_message =
5383 string_sprintf("invalid port number %s", port_name);
5384 goto EXPAND_FAILED;
5385 }
5386 }
5387 else
5388 {
5389 struct servent *service_info = getservbyname(CS port_name, "tcp");
5390 if (!service_info)
5391 {
5392 expand_string_message = string_sprintf("unknown port \"%s\"",
5393 port_name);
5394 goto EXPAND_FAILED;
5395 }
5396 port = ntohs(service_info->s_port);
5397 }
5398
5399 /*XXX we trust that the request is idempotent for TFO. Hmm. */
5400 cctx.sock = ip_connectedsocket(SOCK_STREAM, server_name, port, port,
5401 timeout, &host, &expand_string_message,
5402 do_tls ? NULL : &reqstr);
5403 callout_address = NULL;
5404 if (cctx.sock < 0)
5405 goto SOCK_FAIL;
5406 if (!do_tls)
5407 reqstr.len = 0;
5408 }
5409
5410 /* Handle a Unix domain socket */
5411
5412 else
5413 {
5414 struct sockaddr_un sockun; /* don't call this "sun" ! */
5415 int rc;
5416
5417 if ((cctx.sock = socket(PF_UNIX, SOCK_STREAM, 0)) == -1)
5418 {
5419 expand_string_message = string_sprintf("failed to create socket: %s",
5420 strerror(errno));
5421 goto SOCK_FAIL;
5422 }
5423
5424 sockun.sun_family = AF_UNIX;
5425 sprintf(sockun.sun_path, "%.*s", (int)(sizeof(sockun.sun_path)-1),
5426 sub_arg[0]);
5427 server_name = US sockun.sun_path;
5428
5429 sigalrm_seen = FALSE;
5430 ALARM(timeout);
5431 rc = connect(cctx.sock, (struct sockaddr *)(&sockun), sizeof(sockun));
5432 ALARM_CLR(0);
5433 if (sigalrm_seen)
5434 {
5435 expand_string_message = US "socket connect timed out";
5436 goto SOCK_FAIL;
5437 }
5438 if (rc < 0)
5439 {
5440 expand_string_message = string_sprintf("failed to connect to socket "
5441 "%s: %s", sub_arg[0], strerror(errno));
5442 goto SOCK_FAIL;
5443 }
5444 host.name = server_name;
5445 host.address = US"";
5446 }
5447
5448 DEBUG(D_expand) debug_printf_indent("connected to socket %s\n", sub_arg[0]);
5449
5450 #ifndef DISABLE_TLS
5451 if (do_tls)
5452 {
5453 smtp_connect_args conn_args = {.host = &host };
5454 tls_support tls_dummy = {.sni=NULL};
5455 uschar * errstr;
5456
5457 if (!tls_client_start(&cctx, &conn_args, NULL, &tls_dummy, &errstr))
5458 {
5459 expand_string_message = string_sprintf("TLS connect failed: %s", errstr);
5460 goto SOCK_FAIL;
5461 }
5462 }
5463 #endif
5464
5465 /* Allow sequencing of test actions */
5466 testharness_pause_ms(100);
5467
5468 /* Write the request string, if not empty or already done */
5469
5470 if (reqstr.len)
5471 {
5472 DEBUG(D_expand) debug_printf_indent("writing \"%s\" to socket\n",
5473 reqstr.data);
5474 if ( (
5475 #ifndef DISABLE_TLS
5476 do_tls ? tls_write(cctx.tls_ctx, reqstr.data, reqstr.len, FALSE) :
5477 #endif
5478 write(cctx.sock, reqstr.data, reqstr.len)) != reqstr.len)
5479 {
5480 expand_string_message = string_sprintf("request write to socket "
5481 "failed: %s", strerror(errno));
5482 goto SOCK_FAIL;
5483 }
5484 }
5485
5486 /* Shut down the sending side of the socket. This helps some servers to
5487 recognise that it is their turn to do some work. Just in case some
5488 system doesn't have this function, make it conditional. */
5489
5490 #ifdef SHUT_WR
5491 if (!do_tls && do_shutdown) shutdown(cctx.sock, SHUT_WR);
5492 #endif
5493
5494 testharness_pause_ms(100);
5495
5496 /* Now we need to read from the socket, under a timeout. The function
5497 that reads a file can be used. */
5498
5499 if (!do_tls)
5500 fp = fdopen(cctx.sock, "rb");
5501 sigalrm_seen = FALSE;
5502 ALARM(timeout);
5503 yield =
5504 #ifndef DISABLE_TLS
5505 do_tls ? cat_file_tls(cctx.tls_ctx, yield, sub_arg[3]) :
5506 #endif
5507 cat_file(fp, yield, sub_arg[3]);
5508 ALARM_CLR(0);
5509
5510 #ifndef DISABLE_TLS
5511 if (do_tls)
5512 {
5513 tls_close(cctx.tls_ctx, TRUE);
5514 close(cctx.sock);
5515 }
5516 else
5517 #endif
5518 (void)fclose(fp);
5519
5520 /* After a timeout, we restore the pointer in the result, that is,
5521 make sure we add nothing from the socket. */
5522
5523 if (sigalrm_seen)
5524 {
5525 if (yield) yield->ptr = save_ptr;
5526 expand_string_message = US "socket read timed out";
5527 goto SOCK_FAIL;
5528 }
5529 }
5530
5531 /* The whole thing has worked (or we were skipping). If there is a
5532 failure string following, we need to skip it. */
5533
5534 if (*s == '{')
5535 {
5536 if (!expand_string_internal(s+1, TRUE, &s, TRUE, TRUE, &resetok))
5537 goto EXPAND_FAILED;
5538 if (*s++ != '}')
5539 {
5540 expand_string_message = US"missing '}' closing failstring for readsocket";
5541 goto EXPAND_FAILED_CURLY;
5542 }
5543 while (isspace(*s)) s++;
5544 }
5545
5546 READSOCK_DONE:
5547 if (*s++ != '}')
5548 {
5549 expand_string_message = US"missing '}' closing readsocket";
5550 goto EXPAND_FAILED_CURLY;
5551 }
5552 continue;
5553
5554 /* Come here on failure to create socket, connect socket, write to the
5555 socket, or timeout on reading. If another substring follows, expand and
5556 use it. Otherwise, those conditions give expand errors. */
5557
5558 SOCK_FAIL:
5559 if (*s != '{') goto EXPAND_FAILED;
5560 DEBUG(D_any) debug_printf("%s\n", expand_string_message);
5561 if (!(arg = expand_string_internal(s+1, TRUE, &s, FALSE, TRUE, &resetok)))
5562 goto EXPAND_FAILED;
5563 yield = string_cat(yield, arg);
5564 if (*s++ != '}')
5565 {
5566 expand_string_message = US"missing '}' closing failstring for readsocket";
5567 goto EXPAND_FAILED_CURLY;
5568 }
5569 while (isspace(*s)) s++;
5570 goto READSOCK_DONE;
5571 }
5572
5573 /* Handle "run" to execute a program. */
5574
5575 case EITEM_RUN:
5576 {
5577 FILE *f;
5578 uschar *arg;
5579 const uschar **argv;
5580 pid_t pid;
5581 int fd_in, fd_out;
5582
5583 if ((expand_forbid & RDO_RUN) != 0)
5584 {
5585 expand_string_message = US"running a command is not permitted";
5586 goto EXPAND_FAILED;
5587 }
5588
5589 while (isspace(*s)) s++;
5590 if (*s != '{')
5591 {
5592 expand_string_message = US"missing '{' for command arg of run";
5593 goto EXPAND_FAILED_CURLY;
5594 }
5595 if (!(arg = expand_string_internal(s+1, TRUE, &s, skipping, TRUE, &resetok)))
5596 goto EXPAND_FAILED;
5597 while (isspace(*s)) s++;
5598 if (*s++ != '}')
5599 {
5600 expand_string_message = US"missing '}' closing command arg of run";
5601 goto EXPAND_FAILED_CURLY;
5602 }
5603
5604 if (skipping) /* Just pretend it worked when we're skipping */
5605 {
5606 runrc = 0;
5607 lookup_value = NULL;
5608 }
5609 else
5610 {
5611 if (!transport_set_up_command(&argv, /* anchor for arg list */
5612 arg, /* raw command */
5613 FALSE, /* don't expand the arguments */
5614 0, /* not relevant when... */
5615 NULL, /* no transporting address */
5616 US"${run} expansion", /* for error messages */
5617 &expand_string_message)) /* where to put error message */
5618 goto EXPAND_FAILED;
5619
5620 /* Create the child process, making it a group leader. */
5621
5622 if ((pid = child_open(USS argv, NULL, 0077, &fd_in, &fd_out, TRUE,
5623 US"expand-run")) < 0)
5624 {
5625 expand_string_message =
5626 string_sprintf("couldn't create child process: %s", strerror(errno));
5627 goto EXPAND_FAILED;
5628 }
5629
5630 /* Nothing is written to the standard input. */
5631
5632 (void)close(fd_in);
5633
5634 /* Read the pipe to get the command's output into $value (which is kept
5635 in lookup_value). Read during execution, so that if the output exceeds
5636 the OS pipe buffer limit, we don't block forever. Remember to not release
5637 memory just allocated for $value. */
5638
5639 resetok = FALSE;
5640 f = fdopen(fd_out, "rb");
5641 sigalrm_seen = FALSE;
5642 ALARM(60);
5643 lookup_value = string_from_gstring(cat_file(f, NULL, NULL));
5644 ALARM_CLR(0);
5645 (void)fclose(f);
5646
5647 /* Wait for the process to finish, applying the timeout, and inspect its
5648 return code for serious disasters. Simple non-zero returns are passed on.
5649 */
5650
5651 if (sigalrm_seen || (runrc = child_close(pid, 30)) < 0)
5652 {
5653 if (sigalrm_seen || runrc == -256)
5654 {
5655 expand_string_message = US"command timed out";
5656 killpg(pid, SIGKILL); /* Kill the whole process group */
5657 }
5658
5659 else if (runrc == -257)
5660 expand_string_message = string_sprintf("wait() failed: %s",
5661 strerror(errno));
5662
5663 else
5664 expand_string_message = string_sprintf("command killed by signal %d",
5665 -runrc);
5666
5667 goto EXPAND_FAILED;
5668 }
5669 }
5670
5671 /* Process the yes/no strings; $value may be useful in both cases */
5672
5673 switch(process_yesno(
5674 skipping, /* were previously skipping */
5675 runrc == 0, /* success/failure indicator */
5676 lookup_value, /* value to reset for string2 */
5677 &s, /* input pointer */
5678 &yield, /* output pointer */
5679 US"run", /* condition type */
5680 &resetok))
5681 {
5682 case 1: goto EXPAND_FAILED; /* when all is well, the */
5683 case 2: goto EXPAND_FAILED_CURLY; /* returned value is 0 */
5684 }
5685
5686 continue;
5687 }
5688
5689 /* Handle character translation for "tr" */
5690
5691 case EITEM_TR:
5692 {
5693 int oldptr = gstring_length(yield);
5694 int o2m;
5695 uschar *sub[3];
5696
5697 switch(read_subs(sub, 3, 3, &s, skipping, TRUE, name, &resetok))
5698 {
5699 case 1: goto EXPAND_FAILED_CURLY;
5700 case 2:
5701 case 3: goto EXPAND_FAILED;
5702 }
5703
5704 yield = string_cat(yield, sub[0]);
5705 o2m = Ustrlen(sub[2]) - 1;
5706
5707 if (o2m >= 0) for (; oldptr < yield->ptr; oldptr++)
5708 {
5709 uschar *m = Ustrrchr(sub[1], yield->s[oldptr]);
5710 if (m)
5711 {
5712 int o = m - sub[1];
5713 yield->s[oldptr] = sub[2][(o < o2m)? o : o2m];
5714 }
5715 }
5716
5717 continue;
5718 }
5719
5720 /* Handle "hash", "length", "nhash", and "substr" when they are given with
5721 expanded arguments. */
5722
5723 case EITEM_HASH:
5724 case EITEM_LENGTH:
5725 case EITEM_NHASH:
5726 case EITEM_SUBSTR:
5727 {
5728 int len;
5729 uschar *ret;
5730 int val[2] = { 0, -1 };
5731 uschar *sub[3];
5732
5733 /* "length" takes only 2 arguments whereas the others take 2 or 3.
5734 Ensure that sub[2] is set in the ${length } case. */
5735
5736 sub[2] = NULL;
5737 switch(read_subs(sub, (item_type == EITEM_LENGTH)? 2:3, 2, &s, skipping,
5738 TRUE, name, &resetok))
5739 {
5740 case 1: goto EXPAND_FAILED_CURLY;
5741 case 2:
5742 case 3: goto EXPAND_FAILED;
5743 }
5744
5745 /* Juggle the arguments if there are only two of them: always move the
5746 string to the last position and make ${length{n}{str}} equivalent to
5747 ${substr{0}{n}{str}}. See the defaults for val[] above. */
5748
5749 if (!sub[2])
5750 {
5751 sub[2] = sub[1];
5752 sub[1] = NULL;
5753 if (item_type == EITEM_LENGTH)
5754 {
5755 sub[1] = sub[0];
5756 sub[0] = NULL;
5757 }
5758 }
5759
5760 for (int i = 0; i < 2; i++) if (sub[i])
5761 {
5762 val[i] = (int)Ustrtol(sub[i], &ret, 10);
5763 if (*ret != 0 || (i != 0 && val[i] < 0))
5764 {
5765 expand_string_message = string_sprintf("\"%s\" is not a%s number "
5766 "(in \"%s\" expansion)", sub[i], (i != 0)? " positive" : "", name);
5767 goto EXPAND_FAILED;
5768 }
5769 }
5770
5771 ret =
5772 item_type == EITEM_HASH
5773 ? compute_hash(sub[2], val[0], val[1], &len)
5774 : item_type == EITEM_NHASH
5775 ? compute_nhash(sub[2], val[0], val[1], &len)
5776 : extract_substr(sub[2], val[0], val[1], &len);
5777 if (!ret)
5778 goto EXPAND_FAILED;
5779 yield = string_catn(yield, ret, len);
5780 continue;
5781 }
5782
5783 /* Handle HMAC computation: ${hmac{<algorithm>}{<secret>}{<text>}}
5784 This code originally contributed by Steve Haslam. It currently supports
5785 the use of MD5 and SHA-1 hashes.
5786
5787 We need some workspace that is large enough to handle all the supported
5788 hash types. Use macros to set the sizes rather than be too elaborate. */
5789
5790 #define MAX_HASHLEN 20
5791 #define MAX_HASHBLOCKLEN 64
5792
5793 case EITEM_HMAC:
5794 {
5795 uschar *sub[3];
5796 md5 md5_base;
5797 hctx sha1_ctx;
5798 void *use_base;
5799 int type;
5800 int hashlen; /* Number of octets for the hash algorithm's output */
5801 int hashblocklen; /* Number of octets the hash algorithm processes */
5802 uschar *keyptr, *p;
5803 unsigned int keylen;
5804
5805 uschar keyhash[MAX_HASHLEN];
5806 uschar innerhash[MAX_HASHLEN];
5807 uschar finalhash[MAX_HASHLEN];
5808 uschar finalhash_hex[2*MAX_HASHLEN];
5809 uschar innerkey[MAX_HASHBLOCKLEN];
5810 uschar outerkey[MAX_HASHBLOCKLEN];
5811
5812 switch (read_subs(sub, 3, 3, &s, skipping, TRUE, name, &resetok))
5813 {
5814 case 1: goto EXPAND_FAILED_CURLY;
5815 case 2:
5816 case 3: goto EXPAND_FAILED;
5817 }
5818
5819 if (!skipping)
5820 {
5821 if (Ustrcmp(sub[0], "md5") == 0)
5822 {
5823 type = HMAC_MD5;
5824 use_base = &md5_base;
5825 hashlen = 16;
5826 hashblocklen = 64;
5827 }
5828 else if (Ustrcmp(sub[0], "sha1") == 0)
5829 {
5830 type = HMAC_SHA1;
5831 use_base = &sha1_ctx;
5832 hashlen = 20;
5833 hashblocklen = 64;
5834 }
5835 else
5836 {
5837 expand_string_message =
5838 string_sprintf("hmac algorithm \"%s\" is not recognised", sub[0]);
5839 goto EXPAND_FAILED;
5840 }
5841
5842 keyptr = sub[1];
5843 keylen = Ustrlen(keyptr);
5844
5845 /* If the key is longer than the hash block length, then hash the key
5846 first */
5847
5848 if (keylen > hashblocklen)
5849 {
5850 chash_start(type, use_base);
5851 chash_end(type, use_base, keyptr, keylen, keyhash);
5852 keyptr = keyhash;
5853 keylen = hashlen;
5854 }
5855
5856 /* Now make the inner and outer key values */
5857
5858 memset(innerkey, 0x36, hashblocklen);
5859 memset(outerkey, 0x5c, hashblocklen);
5860
5861 for (int i = 0; i < keylen; i++)
5862 {
5863 innerkey[i] ^= keyptr[i];
5864 outerkey[i] ^= keyptr[i];
5865 }
5866
5867 /* Now do the hashes */
5868
5869 chash_start(type, use_base);
5870 chash_mid(type, use_base, innerkey);
5871 chash_end(type, use_base, sub[2], Ustrlen(sub[2]), innerhash);
5872
5873 chash_start(type, use_base);
5874 chash_mid(type, use_base, outerkey);
5875 chash_end(type, use_base, innerhash, hashlen, finalhash);
5876
5877 /* Encode the final hash as a hex string */
5878
5879 p = finalhash_hex;
5880 for (int i = 0; i < hashlen; i++)
5881 {
5882 *p++ = hex_digits[(finalhash[i] & 0xf0) >> 4];
5883 *p++ = hex_digits[finalhash[i] & 0x0f];
5884 }
5885
5886 DEBUG(D_any) debug_printf("HMAC[%s](%.*s,%s)=%.*s\n",
5887 sub[0], (int)keylen, keyptr, sub[2], hashlen*2, finalhash_hex);
5888
5889 yield = string_catn(yield, finalhash_hex, hashlen*2);
5890 }
5891 continue;
5892 }
5893
5894 /* Handle global substitution for "sg" - like Perl's s/xxx/yyy/g operator.
5895 We have to save the numerical variables and restore them afterwards. */
5896
5897 case EITEM_SG:
5898 {
5899 const pcre *re;
5900 int moffset, moffsetextra, slen;
5901 int roffset;
5902 int emptyopt;
5903 const uschar *rerror;
5904 uschar *subject;
5905 uschar *sub[3];
5906 int save_expand_nmax =
5907 save_expand_strings(save_expand_nstring, save_expand_nlength);
5908
5909 switch(read_subs(sub, 3, 3, &s, skipping, TRUE, name, &resetok))
5910 {
5911 case 1: goto EXPAND_FAILED_CURLY;
5912 case 2:
5913 case 3: goto EXPAND_FAILED;
5914 }
5915
5916 /* Compile the regular expression */
5917
5918 if (!(re = pcre_compile(CS sub[1], PCRE_COPT, CCSS &rerror,
5919 &roffset, NULL)))
5920 {
5921 expand_string_message = string_sprintf("regular expression error in "
5922 "\"%s\": %s at offset %d", sub[1], rerror, roffset);
5923 goto EXPAND_FAILED;
5924 }
5925
5926 /* Now run a loop to do the substitutions as often as necessary. It ends
5927 when there are no more matches. Take care over matches of the null string;
5928 do the same thing as Perl does. */
5929
5930 subject = sub[0];
5931 slen = Ustrlen(sub[0]);
5932 moffset = moffsetextra = 0;
5933 emptyopt = 0;
5934
5935 for (;;)
5936 {
5937 int ovector[3*(EXPAND_MAXN+1)];
5938 int n = pcre_exec(re, NULL, CS subject, slen, moffset + moffsetextra,
5939 PCRE_EOPT | emptyopt, ovector, nelem(ovector));
5940 uschar *insert;
5941
5942 /* No match - if we previously set PCRE_NOTEMPTY after a null match, this
5943 is not necessarily the end. We want to repeat the match from one
5944 character further along, but leaving the basic offset the same (for
5945 copying below). We can't be at the end of the string - that was checked
5946 before setting PCRE_NOTEMPTY. If PCRE_NOTEMPTY is not set, we are
5947 finished; copy the remaining string and end the loop. */
5948
5949 if (n < 0)
5950 {
5951 if (emptyopt != 0)
5952 {
5953 moffsetextra = 1;
5954 emptyopt = 0;
5955 continue;
5956 }
5957 yield = string_catn(yield, subject+moffset, slen-moffset);
5958 break;
5959 }
5960
5961 /* Match - set up for expanding the replacement. */
5962
5963 if (n == 0) n = EXPAND_MAXN + 1;
5964 expand_nmax = 0;
5965 for (int nn = 0; nn < n*2; nn += 2)
5966 {
5967 expand_nstring[expand_nmax] = subject + ovector[nn];
5968 expand_nlength[expand_nmax++] = ovector[nn+1] - ovector[nn];
5969 }
5970 expand_nmax--;
5971
5972 /* Copy the characters before the match, plus the expanded insertion. */
5973
5974 yield = string_catn(yield, subject + moffset, ovector[0] - moffset);
5975 if (!(insert = expand_string(sub[2])))
5976 goto EXPAND_FAILED;
5977 yield = string_cat(yield, insert);
5978
5979 moffset = ovector[1];
5980 moffsetextra = 0;
5981 emptyopt = 0;
5982
5983 /* If we have matched an empty string, first check to see if we are at
5984 the end of the subject. If so, the loop is over. Otherwise, mimic
5985 what Perl's /g options does. This turns out to be rather cunning. First
5986 we set PCRE_NOTEMPTY and PCRE_ANCHORED and try the match a non-empty
5987 string at the same point. If this fails (picked up above) we advance to
5988 the next character. */
5989
5990 if (ovector[0] == ovector[1])
5991 {
5992 if (ovector[0] == slen) break;
5993 emptyopt = PCRE_NOTEMPTY | PCRE_ANCHORED;
5994 }
5995 }
5996
5997 /* All done - restore numerical variables. */
5998
5999 restore_expand_strings(save_expand_nmax, save_expand_nstring,
6000 save_expand_nlength);
6001 continue;
6002 }
6003
6004 /* Handle keyed and numbered substring extraction. If the first argument
6005 consists entirely of digits, then a numerical extraction is assumed. */
6006
6007 case EITEM_EXTRACT:
6008 {
6009 int field_number = 1;
6010 BOOL field_number_set = FALSE;
6011 uschar *save_lookup_value = lookup_value;
6012 uschar *sub[3];
6013 int save_expand_nmax =
6014 save_expand_strings(save_expand_nstring, save_expand_nlength);
6015
6016 /* On reflection the original behaviour of extract-json for a string
6017 result, leaving it quoted, was a mistake. But it was already published,
6018 hence the addition of jsons. In a future major version, make json
6019 work like josons, and withdraw jsons. */
6020
6021 enum {extract_basic, extract_json, extract_jsons} fmt = extract_basic;
6022
6023 while (isspace(*s)) s++;
6024
6025 /* Check for a format-variant specifier */
6026
6027 if (*s != '{') /*}*/
6028 if (Ustrncmp(s, "json", 4) == 0)
6029 if (*(s += 4) == 's')
6030 {fmt = extract_jsons; s++;}
6031 else
6032 fmt = extract_json;
6033
6034 /* While skipping we cannot rely on the data for expansions being
6035 available (eg. $item) hence cannot decide on numeric vs. keyed.
6036 Read a maximum of 5 arguments (including the yes/no) */
6037
6038 if (skipping)
6039 {
6040 for (int j = 5; j > 0 && *s == '{'; j--) /*'}'*/
6041 {
6042 if (!expand_string_internal(s+1, TRUE, &s, skipping, TRUE, &resetok))
6043 goto EXPAND_FAILED; /*'{'*/
6044 if (*s++ != '}')
6045 {
6046 expand_string_message = US"missing '{' for arg of extract";
6047 goto EXPAND_FAILED_CURLY;
6048 }
6049 while (isspace(*s)) s++;
6050 }
6051 if ( Ustrncmp(s, "fail", 4) == 0 /*'{'*/
6052 && (s[4] == '}' || s[4] == ' ' || s[4] == '\t' || !s[4])
6053 )
6054 {
6055 s += 4;
6056 while (isspace(*s)) s++;
6057 } /*'{'*/
6058 if (*s != '}')
6059 {
6060 expand_string_message = US"missing '}' closing extract";
6061 goto EXPAND_FAILED_CURLY;
6062 }
6063 }
6064
6065 else for (int i = 0, j = 2; i < j; i++) /* Read the proper number of arguments */
6066 {
6067 while (isspace(*s)) s++;
6068 if (*s == '{') /*'}'*/
6069 {
6070 if (!(sub[i] = expand_string_internal(s+1, TRUE, &s, skipping, TRUE, &resetok)))
6071 goto EXPAND_FAILED; /*'{'*/
6072 if (*s++ != '}')
6073 {
6074 expand_string_message = string_sprintf(
6075 "missing '}' closing arg %d of extract", i+1);
6076 goto EXPAND_FAILED_CURLY;
6077 }
6078
6079 /* After removal of leading and trailing white space, the first
6080 argument must not be empty; if it consists entirely of digits
6081 (optionally preceded by a minus sign), this is a numerical
6082 extraction, and we expect 3 arguments (normal) or 2 (json). */
6083
6084 if (i == 0)
6085 {
6086 int len;
6087 int x = 0;
6088 uschar *p = sub[0];
6089
6090 while (isspace(*p)) p++;
6091 sub[0] = p;
6092
6093 len = Ustrlen(p);
6094 while (len > 0 && isspace(p[len-1])) len--;
6095 p[len] = 0;
6096
6097 if (*p == 0)
6098 {
6099 expand_string_message = US"first argument of \"extract\" must "
6100 "not be empty";
6101 goto EXPAND_FAILED;
6102 }
6103
6104 if (*p == '-')
6105 {
6106 field_number = -1;
6107 p++;
6108 }
6109 while (*p != 0 && isdigit(*p)) x = x * 10 + *p++ - '0';
6110 if (*p == 0)
6111 {
6112 field_number *= x;
6113 if (fmt == extract_basic) j = 3; /* Need 3 args */
6114 field_number_set = TRUE;
6115 }
6116 }
6117 }
6118 else
6119 {
6120 expand_string_message = string_sprintf(
6121 "missing '{' for arg %d of extract", i+1);
6122 goto EXPAND_FAILED_CURLY;
6123 }
6124 }
6125
6126 /* Extract either the numbered or the keyed substring into $value. If
6127 skipping, just pretend the extraction failed. */
6128
6129 if (skipping)
6130 lookup_value = NULL;
6131 else switch (fmt)
6132 {
6133 case extract_basic:
6134 lookup_value = field_number_set
6135 ? expand_gettokened(field_number, sub[1], sub[2])
6136 : expand_getkeyed(sub[0], sub[1]);
6137 break;
6138
6139 case extract_json:
6140 case extract_jsons:
6141 {
6142 uschar * s, * item;
6143 const uschar * list;
6144
6145 /* Array: Bracket-enclosed and comma-separated.
6146 Object: Brace-enclosed, comma-sep list of name:value pairs */
6147
6148 if (!(s = dewrap(sub[1], field_number_set ? US"[]" : US"{}")))
6149 {
6150 expand_string_message =
6151 string_sprintf("%s wrapping %s for extract json",
6152 expand_string_message,
6153 field_number_set ? "array" : "object");
6154 goto EXPAND_FAILED_CURLY;
6155 }
6156
6157 list = s;
6158 if (field_number_set)
6159 {
6160 if (field_number <= 0)
6161 {
6162 expand_string_message = US"first argument of \"extract\" must "
6163 "be greater than zero";
6164 goto EXPAND_FAILED;
6165 }
6166 while (field_number > 0 && (item = json_nextinlist(&list)))
6167 field_number--;
6168 if ((lookup_value = s = item))
6169 {
6170 while (*s) s++;
6171 while (--s >= lookup_value && isspace(*s)) *s = '\0';
6172 }
6173 }
6174 else
6175 {
6176 lookup_value = NULL;
6177 while ((item = json_nextinlist(&list)))
6178 {
6179 /* Item is: string name-sep value. string is quoted.
6180 Dequote the string and compare with the search key. */
6181
6182 if (!(item = dewrap(item, US"\"\"")))
6183 {
6184 expand_string_message =
6185 string_sprintf("%s wrapping string key for extract json",
6186 expand_string_message);
6187 goto EXPAND_FAILED_CURLY;
6188 }
6189 if (Ustrcmp(item, sub[0]) == 0) /*XXX should be a UTF8-compare */
6190 {
6191 s = item + Ustrlen(item) + 1;
6192 while (isspace(*s)) s++;
6193 if (*s != ':')
6194 {
6195 expand_string_message =
6196 US"missing object value-separator for extract json";
6197 goto EXPAND_FAILED_CURLY;
6198 }
6199 s++;
6200 while (isspace(*s)) s++;
6201 lookup_value = s;
6202 break;
6203 }
6204 }
6205 }
6206 }
6207
6208 if ( fmt == extract_jsons
6209 && lookup_value
6210 && !(lookup_value = dewrap(lookup_value, US"\"\"")))
6211 {
6212 expand_string_message =
6213 string_sprintf("%s wrapping string result for extract jsons",
6214 expand_string_message);
6215 goto EXPAND_FAILED_CURLY;
6216 }
6217 break; /* json/s */
6218 }
6219
6220 /* If no string follows, $value gets substituted; otherwise there can
6221 be yes/no strings, as for lookup or if. */
6222
6223 switch(process_yesno(
6224 skipping, /* were previously skipping */
6225 lookup_value != NULL, /* success/failure indicator */
6226 save_lookup_value, /* value to reset for string2 */
6227 &s, /* input pointer */
6228 &yield, /* output pointer */
6229 US"extract", /* condition type */
6230 &resetok))
6231 {
6232 case 1: goto EXPAND_FAILED; /* when all is well, the */
6233 case 2: goto EXPAND_FAILED_CURLY; /* returned value is 0 */
6234 }
6235
6236 /* All done - restore numerical variables. */
6237
6238 restore_expand_strings(save_expand_nmax, save_expand_nstring,
6239 save_expand_nlength);
6240
6241 continue;
6242 }
6243
6244 /* return the Nth item from a list */
6245
6246 case EITEM_LISTEXTRACT:
6247 {
6248 int field_number = 1;
6249 uschar *save_lookup_value = lookup_value;
6250 uschar *sub[2];
6251 int save_expand_nmax =
6252 save_expand_strings(save_expand_nstring, save_expand_nlength);
6253
6254 /* Read the field & list arguments */
6255
6256 for (int i = 0; i < 2; i++)
6257 {
6258 skip_whitespace(&s);
6259 if (*s != '{') /*'}'*/
6260 {
6261 expand_string_message = string_sprintf(
6262 "missing '{' for arg %d of listextract", i+1);
6263 goto EXPAND_FAILED_CURLY;
6264 }
6265
6266 sub[i] = expand_string_internal(s+1, TRUE, &s, skipping, TRUE, &resetok);
6267 if (!sub[i]) goto EXPAND_FAILED; /*{*/
6268 if (*s++ != '}')
6269 {
6270 expand_string_message = string_sprintf(
6271 "missing '}' closing arg %d of listextract", i+1);
6272 goto EXPAND_FAILED_CURLY;
6273 }
6274
6275 /* After removal of leading and trailing white space, the first
6276 argument must be numeric and nonempty. */
6277
6278 if (i == 0)
6279 {
6280 int len;
6281 int x = 0;
6282 uschar *p = sub[0];
6283
6284 while (isspace(*p)) p++;
6285 sub[0] = p;
6286
6287 len = Ustrlen(p);
6288 while (len > 0 && isspace(p[len-1])) len--;
6289 p[len] = 0;
6290
6291 if (!*p && !skipping)
6292 {
6293 expand_string_message = US"first argument of \"listextract\" must "
6294 "not be empty";
6295 goto EXPAND_FAILED;
6296 }
6297
6298 if (*p == '-')
6299 {
6300 field_number = -1;
6301 p++;
6302 }
6303 while (*p && isdigit(*p)) x = x * 10 + *p++ - '0';
6304 if (*p)
6305 {
6306 expand_string_message = US"first argument of \"listextract\" must "
6307 "be numeric";
6308 goto EXPAND_FAILED;
6309 }
6310 field_number *= x;
6311 }
6312 }
6313
6314 /* Extract the numbered element into $value. If
6315 skipping, just pretend the extraction failed. */
6316
6317 lookup_value = skipping ? NULL : expand_getlistele(field_number, sub[1]);
6318
6319 /* If no string follows, $value gets substituted; otherwise there can
6320 be yes/no strings, as for lookup or if. */
6321
6322 switch(process_yesno(
6323 skipping, /* were previously skipping */
6324 lookup_value != NULL, /* success/failure indicator */
6325 save_lookup_value, /* value to reset for string2 */
6326 &s, /* input pointer */
6327 &yield, /* output pointer */
6328 US"listextract", /* condition type */
6329 &resetok))
6330 {
6331 case 1: goto EXPAND_FAILED; /* when all is well, the */
6332 case 2: goto EXPAND_FAILED_CURLY; /* returned value is 0 */
6333 }
6334
6335 /* All done - restore numerical variables. */
6336
6337 restore_expand_strings(save_expand_nmax, save_expand_nstring,
6338 save_expand_nlength);
6339
6340 continue;
6341 }
6342
6343 case EITEM_LISTQUOTE:
6344 {
6345 uschar * sub[2];
6346 switch(read_subs(sub, 2, 2, &s, skipping, TRUE, name, &resetok))
6347 {
6348 case 1: goto EXPAND_FAILED_CURLY;
6349 case 2:
6350 case 3: goto EXPAND_FAILED;
6351 }
6352 for (uschar sep = *sub[0], c; c = *sub[1]; sub[1]++)
6353 {
6354 if (c == sep) yield = string_catn(yield, sub[1], 1);
6355 yield = string_catn(yield, sub[1], 1);
6356 }
6357 continue;
6358 }
6359
6360 #ifndef DISABLE_TLS
6361 case EITEM_CERTEXTRACT:
6362 {
6363 uschar *save_lookup_value = lookup_value;
6364 uschar *sub[2];
6365 int save_expand_nmax =
6366 save_expand_strings(save_expand_nstring, save_expand_nlength);
6367
6368 /* Read the field argument */
6369 skip_whitespace(&s);
6370 if (*s != '{') /*}*/
6371 {
6372 expand_string_message = US"missing '{' for field arg of certextract";
6373 goto EXPAND_FAILED_CURLY;
6374 }
6375 sub[0] = expand_string_internal(s+1, TRUE, &s, skipping, TRUE, &resetok);
6376 if (!sub[0]) goto EXPAND_FAILED; /*{*/
6377 if (*s++ != '}')
6378 {
6379 expand_string_message = US"missing '}' closing field arg of certextract";
6380 goto EXPAND_FAILED_CURLY;
6381 }
6382 /* strip spaces fore & aft */
6383 {
6384 int len;
6385 uschar *p = sub[0];
6386
6387 while (isspace(*p)) p++;
6388 sub[0] = p;
6389
6390 len = Ustrlen(p);
6391 while (len > 0 && isspace(p[len-1])) len--;
6392 p[len] = 0;
6393 }
6394
6395 /* inspect the cert argument */
6396 while (isspace(*s)) s++;
6397 if (*s != '{') /*}*/
6398 {
6399 expand_string_message = US"missing '{' for cert variable arg of certextract";
6400 goto EXPAND_FAILED_CURLY;
6401 }
6402 if (*++s != '$')
6403 {
6404 expand_string_message = US"second argument of \"certextract\" must "
6405 "be a certificate variable";
6406 goto EXPAND_FAILED;
6407 }
6408 sub[1] = expand_string_internal(s+1, TRUE, &s, skipping, FALSE, &resetok);
6409 if (!sub[1]) goto EXPAND_FAILED; /*{*/
6410 if (*s++ != '}')
6411 {
6412 expand_string_message = US"missing '}' closing cert variable arg of certextract";
6413 goto EXPAND_FAILED_CURLY;
6414 }
6415
6416 if (skipping)
6417 lookup_value = NULL;
6418 else
6419 {
6420 lookup_value = expand_getcertele(sub[0], sub[1]);
6421 if (*expand_string_message) goto EXPAND_FAILED;
6422 }
6423 switch(process_yesno(
6424 skipping, /* were previously skipping */
6425 lookup_value != NULL, /* success/failure indicator */
6426 save_lookup_value, /* value to reset for string2 */
6427 &s, /* input pointer */
6428 &yield, /* output pointer */
6429 US"certextract", /* condition type */
6430 &resetok))
6431 {
6432 case 1: goto EXPAND_FAILED; /* when all is well, the */
6433 case 2: goto EXPAND_FAILED_CURLY; /* returned value is 0 */
6434 }
6435
6436 restore_expand_strings(save_expand_nmax, save_expand_nstring,
6437 save_expand_nlength);
6438 continue;
6439 }
6440 #endif /*DISABLE_TLS*/
6441
6442 /* Handle list operations */
6443
6444 case EITEM_FILTER:
6445 case EITEM_MAP:
6446 case EITEM_REDUCE:
6447 {
6448 int sep = 0;
6449 int save_ptr = gstring_length(yield);
6450 uschar outsep[2] = { '\0', '\0' };
6451 const uschar *list, *expr, *temp;
6452 uschar *save_iterate_item = iterate_item;
6453 uschar *save_lookup_value = lookup_value;
6454
6455 while (isspace(*s)) s++;
6456 if (*s++ != '{')
6457 {
6458 expand_string_message =
6459 string_sprintf("missing '{' for first arg of %s", name);
6460 goto EXPAND_FAILED_CURLY;
6461 }
6462
6463 if (!(list = expand_string_internal(s, TRUE, &s, skipping, TRUE, &resetok)))
6464 goto EXPAND_FAILED;
6465 if (*s++ != '}')
6466 {
6467 expand_string_message =
6468 string_sprintf("missing '}' closing first arg of %s", name);
6469 goto EXPAND_FAILED_CURLY;
6470 }
6471
6472 if (item_type == EITEM_REDUCE)
6473 {
6474 uschar * t;
6475 while (isspace(*s)) s++;
6476 if (*s++ != '{')
6477 {
6478 expand_string_message = US"missing '{' for second arg of reduce";
6479 goto EXPAND_FAILED_CURLY;
6480 }
6481 t = expand_string_internal(s, TRUE, &s, skipping, TRUE, &resetok);
6482 if (!t) goto EXPAND_FAILED;
6483 lookup_value = t;
6484 if (*s++ != '}')
6485 {
6486 expand_string_message = US"missing '}' closing second arg of reduce";
6487 goto EXPAND_FAILED_CURLY;
6488 }
6489 }
6490
6491 while (isspace(*s)) s++;
6492 if (*s++ != '{')
6493 {
6494 expand_string_message =
6495 string_sprintf("missing '{' for last arg of %s", name);
6496 goto EXPAND_FAILED_CURLY;
6497 }
6498
6499 expr = s;
6500
6501 /* For EITEM_FILTER, call eval_condition once, with result discarded (as
6502 if scanning a "false" part). This allows us to find the end of the
6503 condition, because if the list is empty, we won't actually evaluate the
6504 condition for real. For EITEM_MAP and EITEM_REDUCE, do the same, using
6505 the normal internal expansion function. */
6506
6507 if (item_type == EITEM_FILTER)
6508 {
6509 if ((temp = eval_condition(expr, &resetok, NULL)))
6510 s = temp;
6511 }
6512 else
6513 temp = expand_string_internal(s, TRUE, &s, TRUE, TRUE, &resetok);
6514
6515 if (!temp)
6516 {
6517 expand_string_message = string_sprintf("%s inside \"%s\" item",
6518 expand_string_message, name);
6519 goto EXPAND_FAILED;
6520 }
6521
6522 while (isspace(*s)) s++;
6523 if (*s++ != '}')
6524 { /*{*/
6525 expand_string_message = string_sprintf("missing } at end of condition "
6526 "or expression inside \"%s\"; could be an unquoted } in the content",
6527 name);
6528 goto EXPAND_FAILED;
6529 }
6530
6531 while (isspace(*s)) s++; /*{*/
6532 if (*s++ != '}')
6533 { /*{*/
6534 expand_string_message = string_sprintf("missing } at end of \"%s\"",
6535 name);
6536 goto EXPAND_FAILED;
6537 }
6538
6539 /* If we are skipping, we can now just move on to the next item. When
6540 processing for real, we perform the iteration. */
6541
6542 if (skipping) continue;
6543 while ((iterate_item = string_nextinlist(&list, &sep, NULL, 0)))
6544 {
6545 *outsep = (uschar)sep; /* Separator as a string */
6546
6547 DEBUG(D_expand) debug_printf_indent("%s: $item = '%s' $value = '%s'\n",
6548 name, iterate_item, lookup_value);
6549
6550 if (item_type == EITEM_FILTER)
6551 {
6552 BOOL condresult;
6553 if (!eval_condition(expr, &resetok, &condresult))
6554 {
6555 iterate_item = save_iterate_item;
6556 lookup_value = save_lookup_value;
6557 expand_string_message = string_sprintf("%s inside \"%s\" condition",
6558 expand_string_message, name);
6559 goto EXPAND_FAILED;
6560 }
6561 DEBUG(D_expand) debug_printf_indent("%s: condition is %s\n", name,
6562 condresult? "true":"false");
6563 if (condresult)
6564 temp = iterate_item; /* TRUE => include this item */
6565 else
6566 continue; /* FALSE => skip this item */
6567 }
6568
6569 /* EITEM_MAP and EITEM_REDUCE */
6570
6571 else
6572 {
6573 uschar * t = expand_string_internal(expr, TRUE, NULL, skipping, TRUE, &resetok);
6574 temp = t;
6575 if (!temp)
6576 {
6577 iterate_item = save_iterate_item;
6578 expand_string_message = string_sprintf("%s inside \"%s\" item",
6579 expand_string_message, name);
6580 goto EXPAND_FAILED;
6581 }
6582 if (item_type == EITEM_REDUCE)
6583 {
6584 lookup_value = t; /* Update the value of $value */
6585 continue; /* and continue the iteration */
6586 }
6587 }
6588
6589 /* We reach here for FILTER if the condition is true, always for MAP,
6590 and never for REDUCE. The value in "temp" is to be added to the output
6591 list that is being created, ensuring that any occurrences of the
6592 separator character are doubled. Unless we are dealing with the first
6593 item of the output list, add in a space if the new item begins with the
6594 separator character, or is an empty string. */
6595
6596 if ( yield && yield->ptr != save_ptr
6597 && (temp[0] == *outsep || temp[0] == 0))
6598 yield = string_catn(yield, US" ", 1);
6599
6600 /* Add the string in "temp" to the output list that we are building,
6601 This is done in chunks by searching for the separator character. */
6602
6603 for (;;)
6604 {
6605 size_t seglen = Ustrcspn(temp, outsep);
6606
6607 yield = string_catn(yield, temp, seglen + 1);
6608
6609 /* If we got to the end of the string we output one character
6610 too many; backup and end the loop. Otherwise arrange to double the
6611 separator. */
6612
6613 if (temp[seglen] == '\0') { yield->ptr--; break; }
6614 yield = string_catn(yield, outsep, 1);
6615 temp += seglen + 1;
6616 }
6617
6618 /* Output a separator after the string: we will remove the redundant
6619 final one at the end. */
6620
6621 yield = string_catn(yield, outsep, 1);
6622 } /* End of iteration over the list loop */
6623
6624 /* REDUCE has generated no output above: output the final value of
6625 $value. */
6626
6627 if (item_type == EITEM_REDUCE)
6628 {
6629 yield = string_cat(yield, lookup_value);
6630 lookup_value = save_lookup_value; /* Restore $value */
6631 }
6632
6633 /* FILTER and MAP generate lists: if they have generated anything, remove
6634 the redundant final separator. Even though an empty item at the end of a
6635 list does not count, this is tidier. */
6636
6637 else if (yield && yield->ptr != save_ptr) yield->ptr--;
6638
6639 /* Restore preserved $item */
6640
6641 iterate_item = save_iterate_item;
6642 continue;
6643 }
6644
6645 case EITEM_SORT:
6646 {
6647 int cond_type;
6648 int sep = 0;
6649 const uschar *srclist, *cmp, *xtract;
6650 uschar * opname, * srcitem;
6651 const uschar *dstlist = NULL, *dstkeylist = NULL;
6652 uschar * tmp;
6653 uschar *save_iterate_item = iterate_item;
6654
6655 while (isspace(*s)) s++;
6656 if (*s++ != '{')
6657 {
6658 expand_string_message = US"missing '{' for list arg of sort";
6659 goto EXPAND_FAILED_CURLY;
6660 }
6661
6662 srclist = expand_string_internal(s, TRUE, &s, skipping, TRUE, &resetok);
6663 if (!srclist) goto EXPAND_FAILED;
6664 if (*s++ != '}')
6665 {
6666 expand_string_message = US"missing '}' closing list arg of sort";
6667 goto EXPAND_FAILED_CURLY;
6668 }
6669
6670 while (isspace(*s)) s++;
6671 if (*s++ != '{')
6672 {
6673 expand_string_message = US"missing '{' for comparator arg of sort";
6674 goto EXPAND_FAILED_CURLY;
6675 }
6676
6677 cmp = expand_string_internal(s, TRUE, &s, skipping, FALSE, &resetok);
6678 if (!cmp) goto EXPAND_FAILED;
6679 if (*s++ != '}')
6680 {
6681 expand_string_message = US"missing '}' closing comparator arg of sort";
6682 goto EXPAND_FAILED_CURLY;
6683 }
6684
6685 if ((cond_type = identify_operator(&cmp, &opname)) == -1)
6686 {
6687 if (!expand_string_message)
6688 expand_string_message = string_sprintf("unknown condition \"%s\"", s);
6689 goto EXPAND_FAILED;
6690 }
6691 switch(cond_type)
6692 {
6693 case ECOND_NUM_L: case ECOND_NUM_LE:
6694 case ECOND_NUM_G: case ECOND_NUM_GE:
6695 case ECOND_STR_GE: case ECOND_STR_GEI: case ECOND_STR_GT: case ECOND_STR_GTI:
6696 case ECOND_STR_LE: case ECOND_STR_LEI: case ECOND_STR_LT: case ECOND_STR_LTI:
6697 break;
6698
6699 default:
6700 expand_string_message = US"comparator not handled for sort";
6701 goto EXPAND_FAILED;
6702 }
6703
6704 while (isspace(*s)) s++;
6705 if (*s++ != '{')
6706 {
6707 expand_string_message = US"missing '{' for extractor arg of sort";
6708 goto EXPAND_FAILED_CURLY;
6709 }
6710
6711 xtract = s;
6712 if (!(tmp = expand_string_internal(s, TRUE, &s, TRUE, TRUE, &resetok)))
6713 goto EXPAND_FAILED;
6714 xtract = string_copyn(xtract, s - xtract);
6715
6716 if (*s++ != '}')
6717 {
6718 expand_string_message = US"missing '}' closing extractor arg of sort";
6719 goto EXPAND_FAILED_CURLY;
6720 }
6721 /*{*/
6722 if (*s++ != '}')
6723 { /*{*/
6724 expand_string_message = US"missing } at end of \"sort\"";
6725 goto EXPAND_FAILED;
6726 }
6727
6728 if (skipping) continue;
6729
6730 while ((srcitem = string_nextinlist(&srclist, &sep, NULL, 0)))
6731 {
6732 uschar * srcfield, * dstitem;
6733 gstring * newlist = NULL;
6734 gstring * newkeylist = NULL;
6735
6736 DEBUG(D_expand) debug_printf_indent("%s: $item = \"%s\"\n", name, srcitem);
6737
6738 /* extract field for comparisons */
6739 iterate_item = srcitem;
6740 if ( !(srcfield = expand_string_internal(xtract, FALSE, NULL, FALSE,
6741 TRUE, &resetok))
6742 || !*srcfield)
6743 {
6744 expand_string_message = string_sprintf(
6745 "field-extract in sort: \"%s\"", xtract);
6746 goto EXPAND_FAILED;
6747 }
6748
6749 /* Insertion sort */
6750
6751 /* copy output list until new-item < list-item */
6752 while ((dstitem = string_nextinlist(&dstlist, &sep, NULL, 0)))
6753 {
6754 uschar * dstfield;
6755
6756 /* field for comparison */
6757 if (!(dstfield = string_nextinlist(&dstkeylist, &sep, NULL, 0)))
6758 goto sort_mismatch;
6759
6760 /* String-comparator names start with a letter; numeric names do not */
6761
6762 if (sortsbefore(cond_type, isalpha(opname[0]),
6763 srcfield, dstfield))
6764 {
6765 /* New-item sorts before this dst-item. Append new-item,
6766 then dst-item, then remainder of dst list. */
6767
6768 newlist = string_append_listele(newlist, sep, srcitem);
6769 newkeylist = string_append_listele(newkeylist, sep, srcfield);
6770 srcitem = NULL;
6771
6772 newlist = string_append_listele(newlist, sep, dstitem);
6773 newkeylist = string_append_listele(newkeylist, sep, dstfield);
6774
6775 /*XXX why field-at-a-time copy? Why not just dup the rest of the list? */
6776 while ((dstitem = string_nextinlist(&dstlist, &sep, NULL, 0)))
6777 {
6778 if (!(dstfield = string_nextinlist(&dstkeylist, &sep, NULL, 0)))
6779 goto sort_mismatch;
6780 newlist = string_append_listele(newlist, sep, dstitem);
6781 newkeylist = string_append_listele(newkeylist, sep, dstfield);
6782 }
6783
6784 break;
6785 }
6786
6787 newlist = string_append_listele(newlist, sep, dstitem);
6788 newkeylist = string_append_listele(newkeylist, sep, dstfield);
6789 }
6790
6791 /* If we ran out of dstlist without consuming srcitem, append it */
6792 if (srcitem)
6793 {
6794 newlist = string_append_listele(newlist, sep, srcitem);
6795 newkeylist = string_append_listele(newkeylist, sep, srcfield);
6796 }
6797
6798 dstlist = newlist->s;
6799 dstkeylist = newkeylist->s;
6800
6801 DEBUG(D_expand) debug_printf_indent("%s: dstlist = \"%s\"\n", name, dstlist);
6802 DEBUG(D_expand) debug_printf_indent("%s: dstkeylist = \"%s\"\n", name, dstkeylist);
6803 }
6804
6805 if (dstlist)
6806 yield = string_cat(yield, dstlist);
6807
6808 /* Restore preserved $item */
6809 iterate_item = save_iterate_item;
6810 continue;
6811
6812 sort_mismatch:
6813 expand_string_message = US"Internal error in sort (list mismatch)";
6814 goto EXPAND_FAILED;
6815 }
6816
6817
6818 /* If ${dlfunc } support is configured, handle calling dynamically-loaded
6819 functions, unless locked out at this time. Syntax is ${dlfunc{file}{func}}
6820 or ${dlfunc{file}{func}{arg}} or ${dlfunc{file}{func}{arg1}{arg2}} or up to
6821 a maximum of EXPAND_DLFUNC_MAX_ARGS arguments (defined below). */
6822
6823 #define EXPAND_DLFUNC_MAX_ARGS 8
6824
6825 case EITEM_DLFUNC:
6826 #ifndef EXPAND_DLFUNC
6827 expand_string_message = US"\"${dlfunc\" encountered, but this facility " /*}*/
6828 "is not included in this binary";
6829 goto EXPAND_FAILED;
6830
6831 #else /* EXPAND_DLFUNC */
6832 {
6833 tree_node *t;
6834 exim_dlfunc_t *func;
6835 uschar *result;
6836 int status, argc;
6837 uschar *argv[EXPAND_DLFUNC_MAX_ARGS + 3];
6838
6839 if ((expand_forbid & RDO_DLFUNC) != 0)
6840 {
6841 expand_string_message =
6842 US"dynamically-loaded functions are not permitted";
6843 goto EXPAND_FAILED;
6844 }
6845
6846 switch(read_subs(argv, EXPAND_DLFUNC_MAX_ARGS + 2, 2, &s, skipping,
6847 TRUE, name, &resetok))
6848 {
6849 case 1: goto EXPAND_FAILED_CURLY;
6850 case 2:
6851 case 3: goto EXPAND_FAILED;
6852 }
6853
6854 /* If skipping, we don't actually do anything */
6855
6856 if (skipping) continue;
6857
6858 /* Look up the dynamically loaded object handle in the tree. If it isn't
6859 found, dlopen() the file and put the handle in the tree for next time. */
6860
6861 if (!(t = tree_search(dlobj_anchor, argv[0])))
6862 {
6863 void *handle = dlopen(CS argv[0], RTLD_LAZY);
6864 if (!handle)
6865 {
6866 expand_string_message = string_sprintf("dlopen \"%s\" failed: %s",
6867 argv[0], dlerror());
6868 log_write(0, LOG_MAIN|LOG_PANIC, "%s", expand_string_message);
6869 goto EXPAND_FAILED;
6870 }
6871 t = store_get_perm(sizeof(tree_node) + Ustrlen(argv[0]), is_tainted(argv[0]));
6872 Ustrcpy(t->name, argv[0]);
6873 t->data.ptr = handle;
6874 (void)tree_insertnode(&dlobj_anchor, t);
6875 }
6876
6877 /* Having obtained the dynamically loaded object handle, look up the
6878 function pointer. */
6879
6880 if (!(func = (exim_dlfunc_t *)dlsym(t->data.ptr, CS argv[1])))
6881 {
6882 expand_string_message = string_sprintf("dlsym \"%s\" in \"%s\" failed: "
6883 "%s", argv[1], argv[0], dlerror());
6884 log_write(0, LOG_MAIN|LOG_PANIC, "%s", expand_string_message);
6885 goto EXPAND_FAILED;
6886 }
6887
6888 /* Call the function and work out what to do with the result. If it
6889 returns OK, we have a replacement string; if it returns DEFER then
6890 expansion has failed in a non-forced manner; if it returns FAIL then
6891 failure was forced; if it returns ERROR or any other value there's a
6892 problem, so panic slightly. In any case, assume that the function has
6893 side-effects on the store that must be preserved. */
6894
6895 resetok = FALSE;
6896 result = NULL;
6897 for (argc = 0; argv[argc]; argc++);
6898 status = func(&result, argc - 2, &argv[2]);
6899 if(status == OK)
6900 {
6901 if (!result) result = US"";
6902 yield = string_cat(yield, result);
6903 continue;
6904 }
6905 else
6906 {
6907 expand_string_message = result ? result : US"(no message)";
6908 if (status == FAIL_FORCED)
6909 f.expand_string_forcedfail = TRUE;
6910 else if (status != FAIL)
6911 log_write(0, LOG_MAIN|LOG_PANIC, "dlfunc{%s}{%s} failed (%d): %s",
6912 argv[0], argv[1], status, expand_string_message);
6913 goto EXPAND_FAILED;
6914 }
6915 }
6916 #endif /* EXPAND_DLFUNC */
6917
6918 case EITEM_ENV: /* ${env {name} {val_if_found} {val_if_unfound}} */
6919 {
6920 uschar * key;
6921 uschar *save_lookup_value = lookup_value;
6922
6923 while (isspace(*s)) s++;
6924 if (*s != '{') /*}*/
6925 goto EXPAND_FAILED;
6926
6927 key = expand_string_internal(s+1, TRUE, &s, skipping, TRUE, &resetok);
6928 if (!key) goto EXPAND_FAILED; /*{*/
6929 if (*s++ != '}')
6930 {
6931 expand_string_message = US"missing '{' for name arg of env";
6932 goto EXPAND_FAILED_CURLY;
6933 }
6934
6935 lookup_value = US getenv(CS key);
6936
6937 switch(process_yesno(
6938 skipping, /* were previously skipping */
6939 lookup_value != NULL, /* success/failure indicator */
6940 save_lookup_value, /* value to reset for string2 */
6941 &s, /* input pointer */
6942 &yield, /* output pointer */
6943 US"env", /* condition type */
6944 &resetok))
6945 {
6946 case 1: goto EXPAND_FAILED; /* when all is well, the */
6947 case 2: goto EXPAND_FAILED_CURLY; /* returned value is 0 */
6948 }
6949 continue;
6950 }
6951
6952 #ifdef EXPERIMENTAL_SRS_NATIVE
6953 case EITEM_SRS_ENCODE:
6954 /* ${srs_encode {secret} {return_path} {orig_domain}} */
6955 {
6956 uschar * sub[3];
6957 uschar cksum[4];
6958
6959 switch (read_subs(sub, 3, 3, CUSS &s, skipping, TRUE, name, &resetok))
6960 {
6961 case 1: goto EXPAND_FAILED_CURLY;
6962 case 2:
6963 case 3: goto EXPAND_FAILED;
6964 }
6965
6966 yield = string_catn(yield, US"SRS0=", 5);
6967
6968 /* ${l_4:${hmac{md5}{SRS_SECRET}{${lc:$return_path}}}}= */
6969 hmac_md5(sub[0], string_copylc(sub[1]), cksum, sizeof(cksum));
6970 yield = string_catn(yield, cksum, sizeof(cksum));
6971 yield = string_catn(yield, US"=", 1);
6972
6973 /* ${base32:${eval:$tod_epoch/86400&0x3ff}}= */
6974 {
6975 struct timeval now;
6976 unsigned long i;
6977 gstring * g = NULL;
6978
6979 gettimeofday(&now, NULL);
6980 for (unsigned long i = (now.tv_sec / 86400) & 0x3ff; i; i >>= 5)
6981 g = string_catn(g, &base32_chars[i & 0x1f], 1);
6982 if (g) while (g->ptr > 0)
6983 yield = string_catn(yield, &g->s[--g->ptr], 1);
6984 }
6985 yield = string_catn(yield, US"=", 1);
6986
6987 /* ${domain:$return_path}=${local_part:$return_path} */
6988 {
6989 int start, end, domain;
6990 uschar * t = parse_extract_address(sub[1], &expand_string_message,
6991 &start, &end, &domain, FALSE);
6992 if (!t)
6993 goto EXPAND_FAILED;
6994
6995 if (domain > 0) yield = string_cat(yield, t + domain);
6996 yield = string_catn(yield, US"=", 1);
6997 yield = domain > 0
6998 ? string_catn(yield, t, domain - 1) : string_cat(yield, t);
6999 }
7000
7001 /* @$original_domain */
7002 yield = string_catn(yield, US"@", 1);
7003 yield = string_cat(yield, sub[2]);
7004 continue;
7005 }
7006 #endif /*EXPERIMENTAL_SRS_NATIVE*/
7007 } /* EITEM_* switch */
7008
7009 /* Control reaches here if the name is not recognized as one of the more
7010 complicated expansion items. Check for the "operator" syntax (name terminated
7011 by a colon). Some of the operators have arguments, separated by _ from the
7012 name. */
7013
7014 if (*s == ':')
7015 {
7016 int c;
7017 uschar *arg = NULL;
7018 uschar *sub;
7019 #ifndef DISABLE_TLS
7020 var_entry *vp = NULL;
7021 #endif
7022
7023 /* Owing to an historical mis-design, an underscore may be part of the
7024 operator name, or it may introduce arguments. We therefore first scan the
7025 table of names that contain underscores. If there is no match, we cut off
7026 the arguments and then scan the main table. */
7027
7028 if ((c = chop_match(name, op_table_underscore,
7029 nelem(op_table_underscore))) < 0)
7030 {
7031 if ((arg = Ustrchr(name, '_')))
7032 *arg = 0;
7033 if ((c = chop_match(name, op_table_main, nelem(op_table_main))) >= 0)
7034 c += nelem(op_table_underscore);
7035 if (arg) *arg++ = '_'; /* Put back for error messages */
7036 }
7037
7038 /* Deal specially with operators that might take a certificate variable
7039 as we do not want to do the usual expansion. For most, expand the string.*/
7040 switch(c)
7041 {
7042 #ifndef DISABLE_TLS
7043 case EOP_MD5:
7044 case EOP_SHA1:
7045 case EOP_SHA256:
7046 case EOP_BASE64:
7047 if (s[1] == '$')
7048 {
7049 const uschar * s1 = s;
7050 sub = expand_string_internal(s+2, TRUE, &s1, skipping,
7051 FALSE, &resetok);
7052 if (!sub) goto EXPAND_FAILED; /*{*/
7053 if (*s1 != '}')
7054 {
7055 expand_string_message =
7056 string_sprintf("missing '}' closing cert arg of %s", name);
7057 goto EXPAND_FAILED_CURLY;
7058 }
7059 if ((vp = find_var_ent(sub)) && vp->type == vtype_cert)
7060 {
7061 s = s1+1;
7062 break;
7063 }
7064 vp = NULL;
7065 }
7066 /*FALLTHROUGH*/
7067 #endif
7068 default:
7069 sub = expand_string_internal(s+1, TRUE, &s, skipping, TRUE, &resetok);
7070 if (!sub) goto EXPAND_FAILED;
7071 s++;
7072 break;
7073 }
7074
7075 /* If we are skipping, we don't need to perform the operation at all.
7076 This matters for operations like "mask", because the data may not be
7077 in the correct format when skipping. For example, the expression may test
7078 for the existence of $sender_host_address before trying to mask it. For
7079 other operations, doing them may not fail, but it is a waste of time. */
7080
7081 if (skipping && c >= 0) continue;
7082
7083 /* Otherwise, switch on the operator type */
7084
7085 switch(c)
7086 {
7087 case EOP_BASE32:
7088 {
7089 uschar *t;
7090 unsigned long int n = Ustrtoul(sub, &t, 10);
7091 gstring * g = NULL;
7092
7093 if (*t != 0)
7094 {
7095 expand_string_message = string_sprintf("argument for base32 "
7096 "operator is \"%s\", which is not a decimal number", sub);
7097 goto EXPAND_FAILED;
7098 }
7099 for ( ; n; n >>= 5)
7100 g = string_catn(g, &base32_chars[n & 0x1f], 1);
7101
7102 if (g) while (g->ptr > 0) yield = string_catn(yield, &g->s[--g->ptr], 1);
7103 continue;
7104 }
7105
7106 case EOP_BASE32D:
7107 {
7108 uschar *tt = sub;
7109 unsigned long int n = 0;
7110 while (*tt)
7111 {
7112 uschar * t = Ustrchr(base32_chars, *tt++);
7113 if (!t)
7114 {
7115 expand_string_message = string_sprintf("argument for base32d "
7116 "operator is \"%s\", which is not a base 32 number", sub);
7117 goto EXPAND_FAILED;
7118 }
7119 n = n * 32 + (t - base32_chars);
7120 }
7121 yield = string_fmt_append(yield, "%ld", n);
7122 continue;
7123 }
7124
7125 case EOP_BASE62:
7126 {
7127 uschar *t;
7128 unsigned long int n = Ustrtoul(sub, &t, 10);
7129 if (*t != 0)
7130 {
7131 expand_string_message = string_sprintf("argument for base62 "
7132 "operator is \"%s\", which is not a decimal number", sub);
7133 goto EXPAND_FAILED;
7134 }
7135 yield = string_cat(yield, string_base62(n));
7136 continue;
7137 }
7138
7139 /* Note that for Darwin and Cygwin, BASE_62 actually has the value 36 */
7140
7141 case EOP_BASE62D:
7142 {
7143 uschar *tt = sub;
7144 unsigned long int n = 0;
7145 while (*tt != 0)
7146 {
7147 uschar *t = Ustrchr(base62_chars, *tt++);
7148 if (!t)
7149 {
7150 expand_string_message = string_sprintf("argument for base62d "
7151 "operator is \"%s\", which is not a base %d number", sub,
7152 BASE_62);
7153 goto EXPAND_FAILED;
7154 }
7155 n = n * BASE_62 + (t - base62_chars);
7156 }
7157 yield = string_fmt_append(yield, "%ld", n);
7158 continue;
7159 }
7160
7161 case EOP_BLESS:
7162 /* This is purely for the convenience of the test harness. Do not enable
7163 it otherwise as it defeats the taint-checking security. */
7164
7165 if (f.running_in_test_harness)
7166 yield = string_cat(yield, is_tainted(sub)
7167 ? string_copy_taint(sub, FALSE) : sub);
7168 else
7169 {
7170 DEBUG(D_expand) debug_printf_indent("bless operator not supported\n");
7171 yield = string_cat(yield, sub);
7172 }
7173 continue;
7174
7175 case EOP_EXPAND:
7176 {
7177 uschar *expanded = expand_string_internal(sub, FALSE, NULL, skipping, TRUE, &resetok);
7178 if (!expanded)
7179 {
7180 expand_string_message =
7181 string_sprintf("internal expansion of \"%s\" failed: %s", sub,
7182 expand_string_message);
7183 goto EXPAND_FAILED;
7184 }
7185 yield = string_cat(yield, expanded);
7186 continue;
7187 }
7188
7189 case EOP_LC:
7190 {
7191 int count = 0;
7192 uschar *t = sub - 1;
7193 while (*(++t) != 0) { *t = tolower(*t); count++; }
7194 yield = string_catn(yield, sub, count);
7195 continue;
7196 }
7197
7198 case EOP_UC:
7199 {
7200 int count = 0;
7201 uschar *t = sub - 1;
7202 while (*(++t) != 0) { *t = toupper(*t); count++; }
7203 yield = string_catn(yield, sub, count);
7204 continue;
7205 }
7206
7207 case EOP_MD5:
7208 #ifndef DISABLE_TLS
7209 if (vp && *(void **)vp->value)
7210 {
7211 uschar * cp = tls_cert_fprt_md5(*(void **)vp->value);
7212 yield = string_cat(yield, cp);
7213 }
7214 else
7215 #endif
7216 {
7217 md5 base;
7218 uschar digest[16];
7219 md5_start(&base);
7220 md5_end(&base, sub, Ustrlen(sub), digest);
7221 for (int j = 0; j < 16; j++)
7222 yield = string_fmt_append(yield, "%02x", digest[j]);
7223 }
7224 continue;
7225
7226 case EOP_SHA1:
7227 #ifndef DISABLE_TLS
7228 if (vp && *(void **)vp->value)
7229 {
7230 uschar * cp = tls_cert_fprt_sha1(*(void **)vp->value);
7231 yield = string_cat(yield, cp);
7232 }
7233 else
7234 #endif
7235 {
7236 hctx h;
7237 uschar digest[20];
7238 sha1_start(&h);
7239 sha1_end(&h, sub, Ustrlen(sub), digest);
7240 for (int j = 0; j < 20; j++)
7241 yield = string_fmt_append(yield, "%02X", digest[j]);
7242 }
7243 continue;
7244
7245 case EOP_SHA2:
7246 case EOP_SHA256:
7247 #ifdef EXIM_HAVE_SHA2
7248 if (vp && *(void **)vp->value)
7249 if (c == EOP_SHA256)
7250 yield = string_cat(yield, tls_cert_fprt_sha256(*(void **)vp->value));
7251 else
7252 expand_string_message = US"sha2_N not supported with certificates";
7253 else
7254 {
7255 hctx h;
7256 blob b;
7257 hashmethod m = !arg ? HASH_SHA2_256
7258 : Ustrcmp(arg, "256") == 0 ? HASH_SHA2_256
7259 : Ustrcmp(arg, "384") == 0 ? HASH_SHA2_384
7260 : Ustrcmp(arg, "512") == 0 ? HASH_SHA2_512
7261 : HASH_BADTYPE;
7262
7263 if (m == HASH_BADTYPE || !exim_sha_init(&h, m))
7264 {
7265 expand_string_message = US"unrecognised sha2 variant";
7266 goto EXPAND_FAILED;
7267 }
7268
7269 exim_sha_update(&h, sub, Ustrlen(sub));
7270 exim_sha_finish(&h, &b);
7271 while (b.len-- > 0)
7272 yield = string_fmt_append(yield, "%02X", *b.data++);
7273 }
7274 #else
7275 expand_string_message = US"sha256 only supported with TLS";
7276 #endif
7277 continue;
7278
7279 case EOP_SHA3:
7280 #ifdef EXIM_HAVE_SHA3
7281 {
7282 hctx h;
7283 blob b;
7284 hashmethod m = !arg ? HASH_SHA3_256
7285 : Ustrcmp(arg, "224") == 0 ? HASH_SHA3_224
7286 : Ustrcmp(arg, "256") == 0 ? HASH_SHA3_256
7287 : Ustrcmp(arg, "384") == 0 ? HASH_SHA3_384
7288 : Ustrcmp(arg, "512") == 0 ? HASH_SHA3_512
7289 : HASH_BADTYPE;
7290
7291 if (m == HASH_BADTYPE || !exim_sha_init(&h, m))
7292 {
7293 expand_string_message = US"unrecognised sha3 variant";
7294 goto EXPAND_FAILED;
7295 }
7296
7297 exim_sha_update(&h, sub, Ustrlen(sub));
7298 exim_sha_finish(&h, &b);
7299 while (b.len-- > 0)
7300 yield = string_fmt_append(yield, "%02X", *b.data++);
7301 }
7302 continue;
7303 #else
7304 expand_string_message = US"sha3 only supported with GnuTLS 3.5.0 + or OpenSSL 1.1.1 +";
7305 goto EXPAND_FAILED;
7306 #endif
7307
7308 /* Convert hex encoding to base64 encoding */
7309
7310 case EOP_HEX2B64:
7311 {
7312 int c = 0;
7313 int b = -1;
7314 uschar *in = sub;
7315 uschar *out = sub;
7316 uschar *enc;
7317
7318 for (enc = sub; *enc; enc++)
7319 {
7320 if (!isxdigit(*enc))
7321 {
7322 expand_string_message = string_sprintf("\"%s\" is not a hex "
7323 "string", sub);
7324 goto EXPAND_FAILED;
7325 }
7326 c++;
7327 }
7328
7329 if ((c & 1) != 0)
7330 {
7331 expand_string_message = string_sprintf("\"%s\" contains an odd "
7332 "number of characters", sub);
7333 goto EXPAND_FAILED;
7334 }
7335
7336 while ((c = *in++) != 0)
7337 {
7338 if (isdigit(c)) c -= '0';
7339 else c = toupper(c) - 'A' + 10;
7340 if (b == -1)
7341 b = c << 4;
7342 else
7343 {
7344 *out++ = b | c;
7345 b = -1;
7346 }
7347 }
7348
7349 enc = b64encode(CUS sub, out - sub);
7350 yield = string_cat(yield, enc);
7351 continue;
7352 }
7353
7354 /* Convert octets outside 0x21..0x7E to \xXX form */
7355
7356 case EOP_HEXQUOTE:
7357 {
7358 uschar *t = sub - 1;
7359 while (*(++t) != 0)
7360 {
7361 if (*t < 0x21 || 0x7E < *t)
7362 yield = string_fmt_append(yield, "\\x%02x", *t);
7363 else
7364 yield = string_catn(yield, t, 1);
7365 }
7366 continue;
7367 }
7368
7369 /* count the number of list elements */
7370
7371 case EOP_LISTCOUNT:
7372 {
7373 int cnt = 0;
7374 int sep = 0;
7375 uschar buffer[256];
7376
7377 while (string_nextinlist(CUSS &sub, &sep, buffer, sizeof(buffer))) cnt++;
7378 yield = string_fmt_append(yield, "%d", cnt);
7379 continue;
7380 }
7381
7382 /* expand a named list given the name */
7383 /* handles nested named lists; requotes as colon-sep list */
7384
7385 case EOP_LISTNAMED:
7386 {
7387 tree_node *t = NULL;
7388 const uschar * list;
7389 int sep = 0;
7390 uschar * item;
7391 uschar * suffix = US"";
7392 BOOL needsep = FALSE;
7393 uschar buffer[256];
7394
7395 if (*sub == '+') sub++;
7396 if (!arg) /* no-argument version */
7397 {
7398 if (!(t = tree_search(addresslist_anchor, sub)) &&
7399 !(t = tree_search(domainlist_anchor, sub)) &&
7400 !(t = tree_search(hostlist_anchor, sub)))
7401 t = tree_search(localpartlist_anchor, sub);
7402 }
7403 else switch(*arg) /* specific list-type version */
7404 {
7405 case 'a': t = tree_search(addresslist_anchor, sub); suffix = US"_a"; break;
7406 case 'd': t = tree_search(domainlist_anchor, sub); suffix = US"_d"; break;
7407 case 'h': t = tree_search(hostlist_anchor, sub); suffix = US"_h"; break;
7408 case 'l': t = tree_search(localpartlist_anchor, sub); suffix = US"_l"; break;
7409 default:
7410 expand_string_message = US"bad suffix on \"list\" operator";
7411 goto EXPAND_FAILED;
7412 }
7413
7414 if(!t)
7415 {
7416 expand_string_message = string_sprintf("\"%s\" is not a %snamed list",
7417 sub, !arg?""
7418 : *arg=='a'?"address "
7419 : *arg=='d'?"domain "
7420 : *arg=='h'?"host "
7421 : *arg=='l'?"localpart "
7422 : 0);
7423 goto EXPAND_FAILED;
7424 }
7425
7426 list = ((namedlist_block *)(t->data.ptr))->string;
7427
7428 while ((item = string_nextinlist(&list, &sep, buffer, sizeof(buffer))))
7429 {
7430 uschar * buf = US" : ";
7431 if (needsep)
7432 yield = string_catn(yield, buf, 3);
7433 else
7434 needsep = TRUE;
7435
7436 if (*item == '+') /* list item is itself a named list */
7437 {
7438 uschar * sub = string_sprintf("${listnamed%s:%s}", suffix, item);
7439 item = expand_string_internal(sub, FALSE, NULL, FALSE, TRUE, &resetok);
7440 }
7441 else if (sep != ':') /* item from non-colon-sep list, re-quote for colon list-separator */
7442 {
7443 char * cp;
7444 char tok[3];
7445 tok[0] = sep; tok[1] = ':'; tok[2] = 0;
7446 while ((cp= strpbrk(CCS item, tok)))
7447 {
7448 yield = string_catn(yield, item, cp - CS item);
7449 if (*cp++ == ':') /* colon in a non-colon-sep list item, needs doubling */
7450 {
7451 yield = string_catn(yield, US"::", 2);
7452 item = US cp;
7453 }
7454 else /* sep in item; should already be doubled; emit once */
7455 {
7456 yield = string_catn(yield, US tok, 1);
7457 if (*cp == sep) cp++;
7458 item = US cp;
7459 }
7460 }
7461 }
7462 yield = string_cat(yield, item);
7463 }
7464 continue;
7465 }
7466
7467 /* quote a list-item for the given list-separator */
7468
7469 /* mask applies a mask to an IP address; for example the result of
7470 ${mask:131.111.10.206/28} is 131.111.10.192/28. */
7471
7472 case EOP_MASK:
7473 {
7474 int count;
7475 uschar *endptr;
7476 int binary[4];
7477 int mask, maskoffset;
7478 int type = string_is_ip_address(sub, &maskoffset);
7479 uschar buffer[64];
7480
7481 if (type == 0)
7482 {
7483 expand_string_message = string_sprintf("\"%s\" is not an IP address",
7484 sub);
7485 goto EXPAND_FAILED;
7486 }
7487
7488 if (maskoffset == 0)
7489 {
7490 expand_string_message = string_sprintf("missing mask value in \"%s\"",
7491 sub);
7492 goto EXPAND_FAILED;
7493 }
7494
7495 mask = Ustrtol(sub + maskoffset + 1, &endptr, 10);
7496
7497 if (*endptr != 0 || mask < 0 || mask > ((type == 4)? 32 : 128))
7498 {
7499 expand_string_message = string_sprintf("mask value too big in \"%s\"",
7500 sub);
7501 goto EXPAND_FAILED;
7502 }
7503
7504 /* Convert the address to binary integer(s) and apply the mask */
7505
7506 sub[maskoffset] = 0;
7507 count = host_aton(sub, binary);
7508 host_mask(count, binary, mask);
7509
7510 /* Convert to masked textual format and add to output. */
7511
7512 yield = string_catn(yield, buffer,
7513 host_nmtoa(count, binary, mask, buffer, '.'));
7514 continue;
7515 }
7516
7517 case EOP_IPV6NORM:
7518 case EOP_IPV6DENORM:
7519 {
7520 int type = string_is_ip_address(sub, NULL);
7521 int binary[4];
7522 uschar buffer[44];
7523
7524 switch (type)
7525 {
7526 case 6:
7527 (void) host_aton(sub, binary);
7528 break;
7529
7530 case 4: /* convert to IPv4-mapped IPv6 */
7531 binary[0] = binary[1] = 0;
7532 binary[2] = 0x0000ffff;
7533 (void) host_aton(sub, binary+3);
7534 break;
7535
7536 case 0:
7537 expand_string_message =
7538 string_sprintf("\"%s\" is not an IP address", sub);
7539 goto EXPAND_FAILED;
7540 }
7541
7542 yield = string_catn(yield, buffer, c == EOP_IPV6NORM
7543 ? ipv6_nmtoa(binary, buffer)
7544 : host_nmtoa(4, binary, -1, buffer, ':')
7545 );
7546 continue;
7547 }
7548
7549 case EOP_ADDRESS:
7550 case EOP_LOCAL_PART:
7551 case EOP_DOMAIN:
7552 {
7553 uschar * error;
7554 int start, end, domain;
7555 uschar * t = parse_extract_address(sub, &error, &start, &end, &domain,
7556 FALSE);
7557 if (t)
7558 if (c != EOP_DOMAIN)
7559 yield = c == EOP_LOCAL_PART && domain > 0
7560 ? string_catn(yield, t, domain - 1)
7561 : string_cat(yield, t);
7562 else if (domain > 0)
7563 yield = string_cat(yield, t + domain);
7564 continue;
7565 }
7566
7567 case EOP_ADDRESSES:
7568 {
7569 uschar outsep[2] = { ':', '\0' };
7570 uschar *address, *error;
7571 int save_ptr = gstring_length(yield);
7572 int start, end, domain; /* Not really used */
7573
7574 while (isspace(*sub)) sub++;
7575 if (*sub == '>')
7576 if (*outsep = *++sub) ++sub;
7577 else
7578 {
7579 expand_string_message = string_sprintf("output separator "
7580 "missing in expanding ${addresses:%s}", --sub);
7581 goto EXPAND_FAILED;
7582 }
7583 f.parse_allow_group = TRUE;
7584
7585 for (;;)
7586 {
7587 uschar * p = parse_find_address_end(sub, FALSE);
7588 uschar saveend = *p;
7589 *p = '\0';
7590 address = parse_extract_address(sub, &error, &start, &end, &domain,
7591 FALSE);
7592 *p = saveend;
7593
7594 /* Add the address to the output list that we are building. This is
7595 done in chunks by searching for the separator character. At the
7596 start, unless we are dealing with the first address of the output
7597 list, add in a space if the new address begins with the separator
7598 character, or is an empty string. */
7599
7600 if (address)
7601 {
7602 if (yield && yield->ptr != save_ptr && address[0] == *outsep)
7603 yield = string_catn(yield, US" ", 1);
7604
7605 for (;;)
7606 {
7607 size_t seglen = Ustrcspn(address, outsep);
7608 yield = string_catn(yield, address, seglen + 1);
7609
7610 /* If we got to the end of the string we output one character
7611 too many. */
7612
7613 if (address[seglen] == '\0') { yield->ptr--; break; }
7614 yield = string_catn(yield, outsep, 1);
7615 address += seglen + 1;
7616 }
7617
7618 /* Output a separator after the string: we will remove the
7619 redundant final one at the end. */
7620
7621 yield = string_catn(yield, outsep, 1);
7622 }
7623
7624 if (saveend == '\0') break;
7625 sub = p + 1;
7626 }
7627
7628 /* If we have generated anything, remove the redundant final
7629 separator. */
7630
7631 if (yield && yield->ptr != save_ptr) yield->ptr--;
7632 f.parse_allow_group = FALSE;
7633 continue;
7634 }
7635
7636
7637 /* quote puts a string in quotes if it is empty or contains anything
7638 other than alphamerics, underscore, dot, or hyphen.
7639
7640 quote_local_part puts a string in quotes if RFC 2821/2822 requires it to
7641 be quoted in order to be a valid local part.
7642
7643 In both cases, newlines and carriage returns are converted into \n and \r
7644 respectively */
7645
7646 case EOP_QUOTE:
7647 case EOP_QUOTE_LOCAL_PART:
7648 if (!arg)
7649 {
7650 BOOL needs_quote = (!*sub); /* TRUE for empty string */
7651 uschar *t = sub - 1;
7652
7653 if (c == EOP_QUOTE)
7654 {
7655 while (!needs_quote && *(++t) != 0)
7656 needs_quote = !isalnum(*t) && !strchr("_-.", *t);
7657 }
7658 else /* EOP_QUOTE_LOCAL_PART */
7659 {
7660 while (!needs_quote && *(++t) != 0)
7661 needs_quote = !isalnum(*t) &&
7662 strchr("!#$%&'*+-/=?^_`{|}~", *t) == NULL &&
7663 (*t != '.' || t == sub || t[1] == 0);
7664 }
7665
7666 if (needs_quote)
7667 {
7668 yield = string_catn(yield, US"\"", 1);
7669 t = sub - 1;
7670 while (*(++t) != 0)
7671 {
7672 if (*t == '\n')
7673 yield = string_catn(yield, US"\\n", 2);
7674 else if (*t == '\r')
7675 yield = string_catn(yield, US"\\r", 2);
7676 else
7677 {
7678 if (*t == '\\' || *t == '"')
7679 yield = string_catn(yield, US"\\", 1);
7680 yield = string_catn(yield, t, 1);
7681 }
7682 }
7683 yield = string_catn(yield, US"\"", 1);
7684 }
7685 else yield = string_cat(yield, sub);
7686 continue;
7687 }
7688
7689 /* quote_lookuptype does lookup-specific quoting */
7690
7691 else
7692 {
7693 int n;
7694 uschar *opt = Ustrchr(arg, '_');
7695
7696 if (opt) *opt++ = 0;
7697
7698 if ((n = search_findtype(arg, Ustrlen(arg))) < 0)
7699 {
7700 expand_string_message = search_error_message;
7701 goto EXPAND_FAILED;
7702 }
7703
7704 if (lookup_list[n]->quote)
7705 sub = (lookup_list[n]->quote)(sub, opt);
7706 else if (opt)
7707 sub = NULL;
7708
7709 if (!sub)
7710 {
7711 expand_string_message = string_sprintf(
7712 "\"%s\" unrecognized after \"${quote_%s\"",
7713 opt, arg);
7714 goto EXPAND_FAILED;
7715 }
7716
7717 yield = string_cat(yield, sub);
7718 continue;
7719 }
7720
7721 /* rx quote sticks in \ before any non-alphameric character so that
7722 the insertion works in a regular expression. */
7723
7724 case EOP_RXQUOTE:
7725 {
7726 uschar *t = sub - 1;
7727 while (*(++t) != 0)
7728 {
7729 if (!isalnum(*t))
7730 yield = string_catn(yield, US"\\", 1);
7731 yield = string_catn(yield, t, 1);
7732 }
7733 continue;
7734 }
7735
7736 /* RFC 2047 encodes, assuming headers_charset (default ISO 8859-1) as
7737 prescribed by the RFC, if there are characters that need to be encoded */
7738
7739 case EOP_RFC2047:
7740 {
7741 uschar buffer[2048];
7742 yield = string_cat(yield,
7743 parse_quote_2047(sub, Ustrlen(sub), headers_charset,
7744 buffer, sizeof(buffer), FALSE));
7745 continue;
7746 }
7747
7748 /* RFC 2047 decode */
7749
7750 case EOP_RFC2047D:
7751 {
7752 int len;
7753 uschar *error;
7754 uschar *decoded = rfc2047_decode(sub, check_rfc2047_length,
7755 headers_charset, '?', &len, &error);
7756 if (error)
7757 {
7758 expand_string_message = error;
7759 goto EXPAND_FAILED;
7760 }
7761 yield = string_catn(yield, decoded, len);
7762 continue;
7763 }
7764
7765 /* from_utf8 converts UTF-8 to 8859-1, turning non-existent chars into
7766 underscores */
7767
7768 case EOP_FROM_UTF8:
7769 {
7770 uschar * buff = store_get(4, is_tainted(sub));
7771 while (*sub)
7772 {
7773 int c;
7774 GETUTF8INC(c, sub);
7775 if (c > 255) c = '_';
7776 buff[0] = c;
7777 yield = string_catn(yield, buff, 1);
7778 }
7779 continue;
7780 }
7781
7782 /* replace illegal UTF-8 sequences by replacement character */
7783
7784 #define UTF8_REPLACEMENT_CHAR US"?"
7785
7786 case EOP_UTF8CLEAN:
7787 {
7788 int seq_len = 0, index = 0;
7789 int bytes_left = 0;
7790 long codepoint = -1;
7791 int complete;
7792 uschar seq_buff[4]; /* accumulate utf-8 here */
7793
7794 /* Manually track tainting, as we deal in individual chars below */
7795
7796 if (is_tainted(sub))
7797 if (yield->s && yield->ptr)
7798 gstring_rebuffer(yield);
7799 else
7800 yield->s = store_get(yield->size = Ustrlen(sub), TRUE);
7801
7802 /* Check the UTF-8, byte-by-byte */
7803
7804 while (*sub)
7805 {
7806 complete = 0;
7807 uschar c = *sub++;
7808
7809 if (bytes_left)
7810 {
7811 if ((c & 0xc0) != 0x80)
7812 /* wrong continuation byte; invalidate all bytes */
7813 complete = 1; /* error */
7814 else
7815 {
7816 codepoint = (codepoint << 6) | (c & 0x3f);
7817 seq_buff[index++] = c;
7818 if (--bytes_left == 0) /* codepoint complete */
7819 if(codepoint > 0x10FFFF) /* is it too large? */
7820 complete = -1; /* error (RFC3629 limit) */
7821 else
7822 { /* finished; output utf-8 sequence */
7823 yield = string_catn(yield, seq_buff, seq_len);
7824 index = 0;
7825 }
7826 }
7827 }
7828 else /* no bytes left: new sequence */
7829 {
7830 if(!(c & 0x80)) /* 1-byte sequence, US-ASCII, keep it */
7831 {
7832 yield = string_catn(yield, &c, 1);
7833 continue;
7834 }
7835 if((c & 0xe0) == 0xc0) /* 2-byte sequence */
7836 {
7837 if(c == 0xc0 || c == 0xc1) /* 0xc0 and 0xc1 are illegal */
7838 complete = -1;
7839 else
7840 {
7841 bytes_left = 1;
7842 codepoint = c & 0x1f;
7843 }
7844 }
7845 else if((c & 0xf0) == 0xe0) /* 3-byte sequence */
7846 {
7847 bytes_left = 2;
7848 codepoint = c & 0x0f;
7849 }
7850 else if((c & 0xf8) == 0xf0) /* 4-byte sequence */
7851 {
7852 bytes_left = 3;
7853 codepoint = c & 0x07;
7854 }
7855 else /* invalid or too long (RFC3629 allows only 4 bytes) */
7856 complete = -1;
7857
7858 seq_buff[index++] = c;
7859 seq_len = bytes_left + 1;
7860 } /* if(bytes_left) */
7861
7862 if (complete != 0)
7863 {
7864 bytes_left = index = 0;
7865 yield = string_catn(yield, UTF8_REPLACEMENT_CHAR, 1);
7866 }
7867 if ((complete == 1) && ((c & 0x80) == 0))
7868 /* ASCII character follows incomplete sequence */
7869 yield = string_catn(yield, &c, 1);
7870 }
7871 /* If given a sequence truncated mid-character, we also want to report ?
7872 * Eg, ${length_1:フィル} is one byte, not one character, so we expect
7873 * ${utf8clean:${length_1:フィル}} to yield '?' */
7874 if (bytes_left != 0)
7875 yield = string_catn(yield, UTF8_REPLACEMENT_CHAR, 1);
7876
7877 continue;
7878 }
7879
7880 #ifdef SUPPORT_I18N
7881 case EOP_UTF8_DOMAIN_TO_ALABEL:
7882 {
7883 uschar * error = NULL;
7884 uschar * s = string_domain_utf8_to_alabel(sub, &error);
7885 if (error)
7886 {
7887 expand_string_message = string_sprintf(
7888 "error converting utf8 (%s) to alabel: %s",
7889 string_printing(sub), error);
7890 goto EXPAND_FAILED;
7891 }
7892 yield = string_cat(yield, s);
7893 continue;
7894 }
7895
7896 case EOP_UTF8_DOMAIN_FROM_ALABEL:
7897 {
7898 uschar * error = NULL;
7899 uschar * s = string_domain_alabel_to_utf8(sub, &error);
7900 if (error)
7901 {
7902 expand_string_message = string_sprintf(
7903 "error converting alabel (%s) to utf8: %s",
7904 string_printing(sub), error);
7905 goto EXPAND_FAILED;
7906 }
7907 yield = string_cat(yield, s);
7908 continue;
7909 }
7910
7911 case EOP_UTF8_LOCALPART_TO_ALABEL:
7912 {
7913 uschar * error = NULL;
7914 uschar * s = string_localpart_utf8_to_alabel(sub, &error);
7915 if (error)
7916 {
7917 expand_string_message = string_sprintf(
7918 "error converting utf8 (%s) to alabel: %s",
7919 string_printing(sub), error);
7920 goto EXPAND_FAILED;
7921 }
7922 yield = string_cat(yield, s);
7923 DEBUG(D_expand) debug_printf_indent("yield: '%s'\n", yield->s);
7924 continue;
7925 }
7926
7927 case EOP_UTF8_LOCALPART_FROM_ALABEL:
7928 {
7929 uschar * error = NULL;
7930 uschar * s = string_localpart_alabel_to_utf8(sub, &error);
7931 if (error)
7932 {
7933 expand_string_message = string_sprintf(
7934 "error converting alabel (%s) to utf8: %s",
7935 string_printing(sub), error);
7936 goto EXPAND_FAILED;
7937 }
7938 yield = string_cat(yield, s);
7939 continue;
7940 }
7941 #endif /* EXPERIMENTAL_INTERNATIONAL */
7942
7943 /* escape turns all non-printing characters into escape sequences. */
7944
7945 case EOP_ESCAPE:
7946 {
7947 const uschar * t = string_printing(sub);
7948 yield = string_cat(yield, t);
7949 continue;
7950 }
7951
7952 case EOP_ESCAPE8BIT:
7953 {
7954 uschar c;
7955
7956 for (const uschar * s = sub; (c = *s); s++)
7957 yield = c < 127 && c != '\\'
7958 ? string_catn(yield, s, 1)
7959 : string_fmt_append(yield, "\\%03o", c);
7960 continue;
7961 }
7962
7963 /* Handle numeric expression evaluation */
7964
7965 case EOP_EVAL:
7966 case EOP_EVAL10:
7967 {
7968 uschar *save_sub = sub;
7969 uschar *error = NULL;
7970 int_eximarith_t n = eval_expr(&sub, (c == EOP_EVAL10), &error, FALSE);
7971 if (error)
7972 {
7973 expand_string_message = string_sprintf("error in expression "
7974 "evaluation: %s (after processing \"%.*s\")", error,
7975 (int)(sub-save_sub), save_sub);
7976 goto EXPAND_FAILED;
7977 }
7978 yield = string_fmt_append(yield, PR_EXIM_ARITH, n);
7979 continue;
7980 }
7981
7982 /* Handle time period formatting */
7983
7984 case EOP_TIME_EVAL:
7985 {
7986 int n = readconf_readtime(sub, 0, FALSE);
7987 if (n < 0)
7988 {
7989 expand_string_message = string_sprintf("string \"%s\" is not an "
7990 "Exim time interval in \"%s\" operator", sub, name);
7991 goto EXPAND_FAILED;
7992 }
7993 yield = string_fmt_append(yield, "%d", n);
7994 continue;
7995 }
7996
7997 case EOP_TIME_INTERVAL:
7998 {
7999 int n;
8000 uschar *t = read_number(&n, sub);
8001 if (*t != 0) /* Not A Number*/
8002 {
8003 expand_string_message = string_sprintf("string \"%s\" is not a "
8004 "positive number in \"%s\" operator", sub, name);
8005 goto EXPAND_FAILED;
8006 }
8007 t = readconf_printtime(n);
8008 yield = string_cat(yield, t);
8009 continue;
8010 }
8011
8012 /* Convert string to base64 encoding */
8013
8014 case EOP_STR2B64:
8015 case EOP_BASE64:
8016 {
8017 #ifndef DISABLE_TLS
8018 uschar * s = vp && *(void **)vp->value
8019 ? tls_cert_der_b64(*(void **)vp->value)
8020 : b64encode(CUS sub, Ustrlen(sub));
8021 #else
8022 uschar * s = b64encode(CUS sub, Ustrlen(sub));
8023 #endif
8024 yield = string_cat(yield, s);
8025 continue;
8026 }
8027
8028 case EOP_BASE64D:
8029 {
8030 uschar * s;
8031 int len = b64decode(sub, &s);
8032 if (len < 0)
8033 {
8034 expand_string_message = string_sprintf("string \"%s\" is not "
8035 "well-formed for \"%s\" operator", sub, name);
8036 goto EXPAND_FAILED;
8037 }
8038 yield = string_cat(yield, s);
8039 continue;
8040 }
8041
8042 /* strlen returns the length of the string */
8043
8044 case EOP_STRLEN:
8045 yield = string_fmt_append(yield, "%d", Ustrlen(sub));
8046 continue;
8047
8048 /* length_n or l_n takes just the first n characters or the whole string,
8049 whichever is the shorter;
8050
8051 substr_m_n, and s_m_n take n characters from offset m; negative m take
8052 from the end; l_n is synonymous with s_0_n. If n is omitted in substr it
8053 takes the rest, either to the right or to the left.
8054
8055 hash_n or h_n makes a hash of length n from the string, yielding n
8056 characters from the set a-z; hash_n_m makes a hash of length n, but
8057 uses m characters from the set a-zA-Z0-9.
8058
8059 nhash_n returns a single number between 0 and n-1 (in text form), while
8060 nhash_n_m returns a div/mod hash as two numbers "a/b". The first lies
8061 between 0 and n-1 and the second between 0 and m-1. */
8062
8063 case EOP_LENGTH:
8064 case EOP_L:
8065 case EOP_SUBSTR:
8066 case EOP_S:
8067 case EOP_HASH:
8068 case EOP_H:
8069 case EOP_NHASH:
8070 case EOP_NH:
8071 {
8072 int sign = 1;
8073 int value1 = 0;
8074 int value2 = -1;
8075 int *pn;
8076 int len;
8077 uschar *ret;
8078
8079 if (!arg)
8080 {
8081 expand_string_message = string_sprintf("missing values after %s",
8082 name);
8083 goto EXPAND_FAILED;
8084 }
8085
8086 /* "length" has only one argument, effectively being synonymous with
8087 substr_0_n. */
8088
8089 if (c == EOP_LENGTH || c == EOP_L)
8090 {
8091 pn = &value2;
8092 value2 = 0;
8093 }
8094
8095 /* The others have one or two arguments; for "substr" the first may be
8096 negative. The second being negative means "not supplied". */
8097
8098 else
8099 {
8100 pn = &value1;
8101 if (name[0] == 's' && *arg == '-') { sign = -1; arg++; }
8102 }
8103
8104 /* Read up to two numbers, separated by underscores */
8105
8106 ret = arg;
8107 while (*arg != 0)
8108 {
8109 if (arg != ret && *arg == '_' && pn == &value1)
8110 {
8111 pn = &value2;
8112 value2 = 0;
8113 if (arg[1] != 0) arg++;
8114 }
8115 else if (!isdigit(*arg))
8116 {
8117 expand_string_message =
8118 string_sprintf("non-digit after underscore in \"%s\"", name);
8119 goto EXPAND_FAILED;
8120 }
8121 else *pn = (*pn)*10 + *arg++ - '0';
8122 }
8123 value1 *= sign;
8124
8125 /* Perform the required operation */
8126
8127 ret = c == EOP_HASH || c == EOP_H
8128 ? compute_hash(sub, value1, value2, &len)
8129 : c == EOP_NHASH || c == EOP_NH
8130 ? compute_nhash(sub, value1, value2, &len)
8131 : extract_substr(sub, value1, value2, &len);
8132 if (!ret) goto EXPAND_FAILED;
8133
8134 yield = string_catn(yield, ret, len);
8135 continue;
8136 }
8137
8138 /* Stat a path */
8139
8140 case EOP_STAT:
8141 {
8142 uschar smode[12];
8143 uschar **modetable[3];
8144 mode_t mode;
8145 struct stat st;
8146
8147 if (expand_forbid & RDO_EXISTS)
8148 {
8149 expand_string_message = US"Use of the stat() expansion is not permitted";
8150 goto EXPAND_FAILED;
8151 }
8152
8153 if (stat(CS sub, &st) < 0)
8154 {
8155 expand_string_message = string_sprintf("stat(%s) failed: %s",
8156 sub, strerror(errno));
8157 goto EXPAND_FAILED;
8158 }
8159 mode = st.st_mode;
8160 switch (mode & S_IFMT)
8161 {
8162 case S_IFIFO: smode[0] = 'p'; break;
8163 case S_IFCHR: smode[0] = 'c'; break;
8164 case S_IFDIR: smode[0] = 'd'; break;
8165 case S_IFBLK: smode[0] = 'b'; break;
8166 case S_IFREG: smode[0] = '-'; break;
8167 default: smode[0] = '?'; break;
8168 }
8169
8170 modetable[0] = ((mode & 01000) == 0)? mtable_normal : mtable_sticky;
8171 modetable[1] = ((mode & 02000) == 0)? mtable_normal : mtable_setid;
8172 modetable[2] = ((mode & 04000) == 0)? mtable_normal : mtable_setid;
8173
8174 for (int i = 0; i < 3; i++)
8175 {
8176 memcpy(CS(smode + 7 - i*3), CS(modetable[i][mode & 7]), 3);
8177 mode >>= 3;
8178 }
8179
8180 smode[10] = 0;
8181 yield = string_fmt_append(yield,
8182 "mode=%04lo smode=%s inode=%ld device=%ld links=%ld "
8183 "uid=%ld gid=%ld size=" OFF_T_FMT " atime=%ld mtime=%ld ctime=%ld",
8184 (long)(st.st_mode & 077777), smode, (long)st.st_ino,
8185 (long)st.st_dev, (long)st.st_nlink, (long)st.st_uid,
8186 (long)st.st_gid, st.st_size, (long)st.st_atime,
8187 (long)st.st_mtime, (long)st.st_ctime);
8188 continue;
8189 }
8190
8191 /* vaguely random number less than N */
8192
8193 case EOP_RANDINT:
8194 {
8195 int_eximarith_t max = expanded_string_integer(sub, TRUE);
8196
8197 if (expand_string_message)
8198 goto EXPAND_FAILED;
8199 yield = string_fmt_append(yield, "%d", vaguely_random_number((int)max));
8200 continue;
8201 }
8202
8203 /* Reverse IP, including IPv6 to dotted-nibble */
8204
8205 case EOP_REVERSE_IP:
8206 {
8207 int family, maskptr;
8208 uschar reversed[128];
8209
8210 family = string_is_ip_address(sub, &maskptr);
8211 if (family == 0)
8212 {
8213 expand_string_message = string_sprintf(
8214 "reverse_ip() not given an IP address [%s]", sub);
8215 goto EXPAND_FAILED;
8216 }
8217 invert_address(reversed, sub);
8218 yield = string_cat(yield, reversed);
8219 continue;
8220 }
8221
8222 /* Unknown operator */
8223
8224 default:
8225 expand_string_message =
8226 string_sprintf("unknown expansion operator \"%s\"", name);
8227 goto EXPAND_FAILED;
8228 }
8229 }
8230
8231 /* Handle a plain name. If this is the first thing in the expansion, release
8232 the pre-allocated buffer. If the result data is known to be in a new buffer,
8233 newsize will be set to the size of that buffer, and we can just point at that
8234 store instead of copying. Many expansion strings contain just one reference,
8235 so this is a useful optimization, especially for humungous headers
8236 ($message_headers). */
8237 /*{*/
8238 if (*s++ == '}')
8239 {
8240 int len;
8241 int newsize = 0;
8242 gstring * g = NULL;
8243
8244 if (!yield)
8245 g = store_get(sizeof(gstring), FALSE);
8246 else if (yield->ptr == 0)
8247 {
8248 if (resetok) reset_point = store_reset(reset_point);
8249 yield = NULL;
8250 reset_point = store_mark();
8251 g = store_get(sizeof(gstring), FALSE); /* alloc _before_ calling find_variable() */
8252 }
8253 if (!(value = find_variable(name, FALSE, skipping, &newsize)))
8254 {
8255 expand_string_message =
8256 string_sprintf("unknown variable in \"${%s}\"", name);
8257 check_variable_error_message(name);
8258 goto EXPAND_FAILED;
8259 }
8260 len = Ustrlen(value);
8261 if (!yield && newsize)
8262 {
8263 yield = g;
8264 yield->size = newsize;
8265 yield->ptr = len;
8266 yield->s = value;
8267 }
8268 else
8269 yield = string_catn(yield, value, len);
8270 continue;
8271 }
8272
8273 /* Else there's something wrong */
8274
8275 expand_string_message =
8276 string_sprintf("\"${%s\" is not a known operator (or a } is missing "
8277 "in a variable reference)", name);
8278 goto EXPAND_FAILED;
8279 }
8280
8281 /* If we hit the end of the string when ket_ends is set, there is a missing
8282 terminating brace. */
8283
8284 if (ket_ends && *s == 0)
8285 {
8286 expand_string_message = malformed_header
8287 ? US"missing } at end of string - could be header name not terminated by colon"
8288 : US"missing } at end of string";
8289 goto EXPAND_FAILED;
8290 }
8291
8292 /* Expansion succeeded; yield may still be NULL here if nothing was actually
8293 added to the string. If so, set up an empty string. Add a terminating zero. If
8294 left != NULL, return a pointer to the terminator. */
8295
8296 if (!yield)
8297 yield = string_get(1);
8298 (void) string_from_gstring(yield);
8299 if (left) *left = s;
8300
8301 /* Any stacking store that was used above the final string is no longer needed.
8302 In many cases the final string will be the first one that was got and so there
8303 will be optimal store usage. */
8304
8305 if (resetok) gstring_release_unused(yield);
8306 else if (resetok_p) *resetok_p = FALSE;
8307
8308 DEBUG(D_expand)
8309 {
8310 BOOL tainted = is_tainted(yield->s);
8311 DEBUG(D_noutf8)
8312 {
8313 debug_printf_indent("|--expanding: %.*s\n", (int)(s - string), string);
8314 debug_printf_indent("%sresult: %s\n",
8315 skipping ? "|-----" : "\\_____", yield->s);
8316 if (tainted)
8317 debug_printf_indent("%s \\__(tainted)\n",
8318 skipping ? "| " : " ");
8319 if (skipping)
8320 debug_printf_indent("\\___skipping: result is not used\n");
8321 }
8322 else
8323 {
8324 debug_printf_indent(UTF8_VERT_RIGHT UTF8_HORIZ UTF8_HORIZ
8325 "expanding: %.*s\n",
8326 (int)(s - string), string);
8327 debug_printf_indent("%s" UTF8_HORIZ UTF8_HORIZ UTF8_HORIZ UTF8_HORIZ UTF8_HORIZ
8328 "result: %s\n",
8329 skipping ? UTF8_VERT_RIGHT : UTF8_UP_RIGHT,
8330 yield->s);
8331 if (tainted)
8332 debug_printf_indent("%s(tainted)\n",
8333 skipping
8334 ? UTF8_VERT " " : " " UTF8_UP_RIGHT UTF8_HORIZ UTF8_HORIZ);
8335 if (skipping)
8336 debug_printf_indent(UTF8_UP_RIGHT UTF8_HORIZ UTF8_HORIZ UTF8_HORIZ
8337 "skipping: result is not used\n");
8338 }
8339 }
8340 expand_level--;
8341 return yield->s;
8342
8343 /* This is the failure exit: easiest to program with a goto. We still need
8344 to update the pointer to the terminator, for cases of nested calls with "fail".
8345 */
8346
8347 EXPAND_FAILED_CURLY:
8348 if (malformed_header)
8349 expand_string_message =
8350 US"missing or misplaced { or } - could be header name not terminated by colon";
8351
8352 else if (!expand_string_message || !*expand_string_message)
8353 expand_string_message = US"missing or misplaced { or }";
8354
8355 /* At one point, Exim reset the store to yield (if yield was not NULL), but
8356 that is a bad idea, because expand_string_message is in dynamic store. */
8357
8358 EXPAND_FAILED:
8359 if (left) *left = s;
8360 DEBUG(D_expand)
8361 DEBUG(D_noutf8)
8362 {
8363 debug_printf_indent("|failed to expand: %s\n", string);
8364 debug_printf_indent("%serror message: %s\n",
8365 f.expand_string_forcedfail ? "|---" : "\\___", expand_string_message);
8366 if (f.expand_string_forcedfail)
8367 debug_printf_indent("\\failure was forced\n");
8368 }
8369 else
8370 {
8371 debug_printf_indent(UTF8_VERT_RIGHT "failed to expand: %s\n",
8372 string);
8373 debug_printf_indent("%s" UTF8_HORIZ UTF8_HORIZ UTF8_HORIZ
8374 "error message: %s\n",
8375 f.expand_string_forcedfail ? UTF8_VERT_RIGHT : UTF8_UP_RIGHT,
8376 expand_string_message);
8377 if (f.expand_string_forcedfail)
8378 debug_printf_indent(UTF8_UP_RIGHT "failure was forced\n");
8379 }
8380 if (resetok_p && !resetok) *resetok_p = FALSE;
8381 expand_level--;
8382 return NULL;
8383 }
8384
8385
8386 /* This is the external function call. Do a quick check for any expansion
8387 metacharacters, and if there are none, just return the input string.
8388
8389 Argument: the string to be expanded
8390 Returns: the expanded string, or NULL if expansion failed; if failure was
8391 due to a lookup deferring, search_find_defer will be TRUE
8392 */
8393
8394 const uschar *
8395 expand_cstring(const uschar * string)
8396 {
8397 if (Ustrpbrk(string, "$\\") != NULL)
8398 {
8399 int old_pool = store_pool;
8400 uschar * s;
8401
8402 f.search_find_defer = FALSE;
8403 malformed_header = FALSE;
8404 store_pool = POOL_MAIN;
8405 s = expand_string_internal(string, FALSE, NULL, FALSE, TRUE, NULL);
8406 store_pool = old_pool;
8407 return s;
8408 }
8409 return string;
8410 }
8411
8412
8413 uschar *
8414 expand_string(uschar * string)
8415 {
8416 return US expand_cstring(CUS string);
8417 }
8418
8419
8420
8421
8422
8423 /*************************************************
8424 * Expand and copy *
8425 *************************************************/
8426
8427 /* Now and again we want to expand a string and be sure that the result is in a
8428 new bit of store. This function does that.
8429 Since we know it has been copied, the de-const cast is safe.
8430
8431 Argument: the string to be expanded
8432 Returns: the expanded string, always in a new bit of store, or NULL
8433 */
8434
8435 uschar *
8436 expand_string_copy(const uschar *string)
8437 {
8438 const uschar *yield = expand_cstring(string);
8439 if (yield == string) yield = string_copy(string);
8440 return US yield;
8441 }
8442
8443
8444
8445 /*************************************************
8446 * Expand and interpret as an integer *
8447 *************************************************/
8448
8449 /* Expand a string, and convert the result into an integer.
8450
8451 Arguments:
8452 string the string to be expanded
8453 isplus TRUE if a non-negative number is expected
8454
8455 Returns: the integer value, or
8456 -1 for an expansion error ) in both cases, message in
8457 -2 for an integer interpretation error ) expand_string_message
8458 expand_string_message is set NULL for an OK integer
8459 */
8460
8461 int_eximarith_t
8462 expand_string_integer(uschar *string, BOOL isplus)
8463 {
8464 return expanded_string_integer(expand_string(string), isplus);
8465 }
8466
8467
8468 /*************************************************
8469 * Interpret string as an integer *
8470 *************************************************/
8471
8472 /* Convert a string (that has already been expanded) into an integer.
8473
8474 This function is used inside the expansion code.
8475
8476 Arguments:
8477 s the string to be expanded
8478 isplus TRUE if a non-negative number is expected
8479
8480 Returns: the integer value, or
8481 -1 if string is NULL (which implies an expansion error)
8482 -2 for an integer interpretation error
8483 expand_string_message is set NULL for an OK integer
8484 */
8485
8486 static int_eximarith_t
8487 expanded_string_integer(const uschar *s, BOOL isplus)
8488 {
8489 int_eximarith_t value;
8490 uschar *msg = US"invalid integer \"%s\"";
8491 uschar *endptr;
8492
8493 /* If expansion failed, expand_string_message will be set. */
8494
8495 if (!s) return -1;
8496
8497 /* On an overflow, strtol() returns LONG_MAX or LONG_MIN, and sets errno
8498 to ERANGE. When there isn't an overflow, errno is not changed, at least on some
8499 systems, so we set it zero ourselves. */
8500
8501 errno = 0;
8502 expand_string_message = NULL; /* Indicates no error */
8503
8504 /* Before Exim 4.64, strings consisting entirely of whitespace compared
8505 equal to 0. Unfortunately, people actually relied upon that, so preserve
8506 the behaviour explicitly. Stripping leading whitespace is a harmless
8507 noop change since strtol skips it anyway (provided that there is a number
8508 to find at all). */
8509 if (isspace(*s))
8510 {
8511 while (isspace(*s)) ++s;
8512 if (*s == '\0')
8513 {
8514 DEBUG(D_expand)
8515 debug_printf_indent("treating blank string as number 0\n");
8516 return 0;
8517 }
8518 }
8519
8520 value = strtoll(CS s, CSS &endptr, 10);
8521
8522 if (endptr == s)
8523 {
8524 msg = US"integer expected but \"%s\" found";
8525 }
8526 else if (value < 0 && isplus)
8527 {
8528 msg = US"non-negative integer expected but \"%s\" found";
8529 }
8530 else
8531 {
8532 switch (tolower(*endptr))
8533 {
8534 default:
8535 break;
8536 case 'k':
8537 if (value > EXIM_ARITH_MAX/1024 || value < EXIM_ARITH_MIN/1024) errno = ERANGE;
8538 else value *= 1024;
8539 endptr++;
8540 break;
8541 case 'm':
8542 if (value > EXIM_ARITH_MAX/(1024*1024) || value < EXIM_ARITH_MIN/(1024*1024)) errno = ERANGE;
8543 else value *= 1024*1024;
8544 endptr++;
8545 break;
8546 case 'g':
8547 if (value > EXIM_ARITH_MAX/(1024*1024*1024) || value < EXIM_ARITH_MIN/(1024*1024*1024)) errno = ERANGE;
8548 else value *= 1024*1024*1024;
8549 endptr++;
8550 break;
8551 }
8552 if (errno == ERANGE)
8553 msg = US"absolute value of integer \"%s\" is too large (overflow)";
8554 else
8555 {
8556 while (isspace(*endptr)) endptr++;
8557 if (*endptr == 0) return value;
8558 }
8559 }
8560
8561 expand_string_message = string_sprintf(CS msg, s);
8562 return -2;
8563 }
8564
8565
8566 /* These values are usually fixed boolean values, but they are permitted to be
8567 expanded strings.
8568
8569 Arguments:
8570 addr address being routed
8571 mtype the module type
8572 mname the module name
8573 dbg_opt debug selectors
8574 oname the option name
8575 bvalue the router's boolean value
8576 svalue the router's string value
8577 rvalue where to put the returned value
8578
8579 Returns: OK value placed in rvalue
8580 DEFER expansion failed
8581 */
8582
8583 int
8584 exp_bool(address_item *addr,
8585 uschar *mtype, uschar *mname, unsigned dbg_opt,
8586 uschar *oname, BOOL bvalue,
8587 uschar *svalue, BOOL *rvalue)
8588 {
8589 uschar *expanded;
8590 if (!svalue) { *rvalue = bvalue; return OK; }
8591
8592 if (!(expanded = expand_string(svalue)))
8593 {
8594 if (f.expand_string_forcedfail)
8595 {
8596 DEBUG(dbg_opt) debug_printf("expansion of \"%s\" forced failure\n", oname);
8597 *rvalue = bvalue;
8598 return OK;
8599 }
8600 addr->message = string_sprintf("failed to expand \"%s\" in %s %s: %s",
8601 oname, mname, mtype, expand_string_message);
8602 DEBUG(dbg_opt) debug_printf("%s\n", addr->message);
8603 return DEFER;
8604 }
8605
8606 DEBUG(dbg_opt) debug_printf("expansion of \"%s\" yields \"%s\"\n", oname,
8607 expanded);
8608
8609 if (strcmpic(expanded, US"true") == 0 || strcmpic(expanded, US"yes") == 0)
8610 *rvalue = TRUE;
8611 else if (strcmpic(expanded, US"false") == 0 || strcmpic(expanded, US"no") == 0)
8612 *rvalue = FALSE;
8613 else
8614 {
8615 addr->message = string_sprintf("\"%s\" is not a valid value for the "
8616 "\"%s\" option in the %s %s", expanded, oname, mname, mtype);
8617 return DEFER;
8618 }
8619
8620 return OK;
8621 }
8622
8623
8624
8625 /* Avoid potentially exposing a password in a string about to be logged */
8626
8627 uschar *
8628 expand_hide_passwords(uschar * s)
8629 {
8630 return ( ( Ustrstr(s, "failed to expand") != NULL
8631 || Ustrstr(s, "expansion of ") != NULL
8632 )
8633 && ( Ustrstr(s, "mysql") != NULL
8634 || Ustrstr(s, "pgsql") != NULL
8635 || Ustrstr(s, "redis") != NULL
8636 || Ustrstr(s, "sqlite") != NULL
8637 || Ustrstr(s, "ldap:") != NULL
8638 || Ustrstr(s, "ldaps:") != NULL
8639 || Ustrstr(s, "ldapi:") != NULL
8640 || Ustrstr(s, "ldapdn:") != NULL
8641 || Ustrstr(s, "ldapm:") != NULL
8642 ) )
8643 ? US"Temporary internal error" : s;
8644 }
8645
8646
8647 /* Read given named file into big_buffer. Use for keying material etc.
8648 The content will have an ascii NUL appended.
8649
8650 Arguments:
8651 filename as it says
8652
8653 Return: pointer to buffer, or NULL on error.
8654 */
8655
8656 uschar *
8657 expand_file_big_buffer(const uschar * filename)
8658 {
8659 int fd, off = 0, len;
8660
8661 if ((fd = exim_open2(CS filename, O_RDONLY)) < 0)
8662 {
8663 log_write(0, LOG_MAIN | LOG_PANIC, "unable to open file for reading: %s",
8664 filename);
8665 return NULL;
8666 }
8667
8668 do
8669 {
8670 if ((len = read(fd, big_buffer + off, big_buffer_size - 2 - off)) < 0)
8671 {
8672 (void) close(fd);
8673 log_write(0, LOG_MAIN|LOG_PANIC, "unable to read file: %s", filename);
8674 return NULL;
8675 }
8676 off += len;
8677 }
8678 while (len > 0);
8679
8680 (void) close(fd);
8681 big_buffer[off] = '\0';
8682 return big_buffer;
8683 }
8684
8685
8686
8687 /*************************************************
8688 * Error-checking for testsuite *
8689 *************************************************/
8690 typedef struct {
8691 uschar * region_start;
8692 uschar * region_end;
8693 const uschar *var_name;
8694 const uschar *var_data;
8695 } err_ctx;
8696
8697 static void
8698 assert_variable_notin(uschar * var_name, uschar * var_data, void * ctx)
8699 {
8700 err_ctx * e = ctx;
8701 if (var_data >= e->region_start && var_data < e->region_end)
8702 {
8703 e->var_name = CUS var_name;
8704 e->var_data = CUS var_data;
8705 }
8706 }
8707
8708 void
8709 assert_no_variables(void * ptr, int len, const char * filename, int linenumber)
8710 {
8711 err_ctx e = { .region_start = ptr, .region_end = US ptr + len,
8712 .var_name = NULL, .var_data = NULL };
8713
8714 /* check acl_ variables */
8715 tree_walk(acl_var_c, assert_variable_notin, &e);
8716 tree_walk(acl_var_m, assert_variable_notin, &e);
8717
8718 /* check auth<n> variables */
8719 for (int i = 0; i < AUTH_VARS; i++) if (auth_vars[i])
8720 assert_variable_notin(US"auth<n>", auth_vars[i], &e);
8721
8722 /* check regex<n> variables */
8723 for (int i = 0; i < REGEX_VARS; i++) if (regex_vars[i])
8724 assert_variable_notin(US"regex<n>", regex_vars[i], &e);
8725
8726 /* check known-name variables */
8727 for (var_entry * v = var_table; v < var_table + var_table_size; v++)
8728 if (v->type == vtype_stringptr)
8729 assert_variable_notin(US v->name, *(USS v->value), &e);
8730
8731 /* check dns and address trees */
8732 tree_walk(tree_dns_fails, assert_variable_notin, &e);
8733 tree_walk(tree_duplicates, assert_variable_notin, &e);
8734 tree_walk(tree_nonrecipients, assert_variable_notin, &e);
8735 tree_walk(tree_unusable, assert_variable_notin, &e);
8736
8737 if (e.var_name)
8738 log_write(0, LOG_MAIN|LOG_PANIC_DIE,
8739 "live variable '%s' destroyed by reset_store at %s:%d\n- value '%.64s'",
8740 e.var_name, filename, linenumber, e.var_data);
8741 }
8742
8743
8744
8745 /*************************************************
8746 **************************************************
8747 * Stand-alone test program *
8748 **************************************************
8749 *************************************************/
8750
8751 #ifdef STAND_ALONE
8752
8753
8754 BOOL
8755 regex_match_and_setup(const pcre *re, uschar *subject, int options, int setup)
8756 {
8757 int ovector[3*(EXPAND_MAXN+1)];
8758 int n = pcre_exec(re, NULL, subject, Ustrlen(subject), 0, PCRE_EOPT|options,
8759 ovector, nelem(ovector));
8760 BOOL yield = n >= 0;
8761 if (n == 0) n = EXPAND_MAXN + 1;
8762 if (yield)
8763 {
8764 expand_nmax = setup < 0 ? 0 : setup + 1;
8765 for (int nn = setup < 0 ? 0 : 2; nn < n*2; nn += 2)
8766 {
8767 expand_nstring[expand_nmax] = subject + ovector[nn];
8768 expand_nlength[expand_nmax++] = ovector[nn+1] - ovector[nn];
8769 }
8770 expand_nmax--;
8771 }
8772 return yield;
8773 }
8774
8775
8776 int main(int argc, uschar **argv)
8777 {
8778 uschar buffer[1024];
8779
8780 debug_selector = D_v;
8781 debug_file = stderr;
8782 debug_fd = fileno(debug_file);
8783 big_buffer = malloc(big_buffer_size);
8784
8785 for (int i = 1; i < argc; i++)
8786 {
8787 if (argv[i][0] == '+')
8788 {
8789 debug_trace_memory = 2;
8790 argv[i]++;
8791 }
8792 if (isdigit(argv[i][0]))
8793 debug_selector = Ustrtol(argv[i], NULL, 0);
8794 else
8795 if (Ustrspn(argv[i], "abcdefghijklmnopqrtsuvwxyz0123456789-.:/") ==
8796 Ustrlen(argv[i]))
8797 {
8798 #ifdef LOOKUP_LDAP
8799 eldap_default_servers = argv[i];
8800 #endif
8801 #ifdef LOOKUP_MYSQL
8802 mysql_servers = argv[i];
8803 #endif
8804 #ifdef LOOKUP_PGSQL
8805 pgsql_servers = argv[i];
8806 #endif
8807 #ifdef LOOKUP_REDIS
8808 redis_servers = argv[i];
8809 #endif
8810 }
8811 #ifdef EXIM_PERL
8812 else opt_perl_startup = argv[i];
8813 #endif
8814 }
8815
8816 printf("Testing string expansion: debug_level = %d\n\n", debug_level);
8817
8818 expand_nstring[1] = US"string 1....";
8819 expand_nlength[1] = 8;
8820 expand_nmax = 1;
8821
8822 #ifdef EXIM_PERL
8823 if (opt_perl_startup != NULL)
8824 {
8825 uschar *errstr;
8826 printf("Starting Perl interpreter\n");
8827 errstr = init_perl(opt_perl_startup);
8828 if (errstr != NULL)
8829 {
8830 printf("** error in perl_startup code: %s\n", errstr);
8831 return EXIT_FAILURE;
8832 }
8833 }
8834 #endif /* EXIM_PERL */
8835
8836 /* Thie deliberately regards the input as untainted, so that it can be
8837 expanded; only reasonable since this is a test for string-expansions. */
8838
8839 while (fgets(buffer, sizeof(buffer), stdin) != NULL)
8840 {
8841 rmark reset_point = store_mark();
8842 uschar *yield = expand_string(buffer);
8843 if (yield)
8844 printf("%s\n", yield);
8845 else
8846 {
8847 if (f.search_find_defer) printf("search_find deferred\n");
8848 printf("Failed: %s\n", expand_string_message);
8849 if (f.expand_string_forcedfail) printf("Forced failure\n");
8850 printf("\n");
8851 }
8852 store_reset(reset_point);
8853 }
8854
8855 search_tidyup();
8856
8857 return 0;
8858 }
8859
8860 #endif
8861
8862 /* vi: aw ai sw=2
8863 */
8864 /* End of expand.c */
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