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