Merge from EXISCAN branch.
[exim.git] / src / src / expand.c
1 /* $Cambridge: exim/src/src/expand.c,v 1.8 2004/12/16 15:11:47 tom Exp $ */
2
3 /*************************************************
4 * Exim - an Internet mail transport agent *
5 *************************************************/
6
7 /* Copyright (c) University of Cambridge 1995 - 2004 */
8 /* See the file NOTICE for conditions of use and distribution. */
9
10
11 /* Functions for handling string expansion. */
12
13
14 #include "exim.h"
15
16 #ifdef STAND_ALONE
17 #ifndef SUPPORT_CRYPTEQ
18 #define SUPPORT_CRYPTEQ
19 #endif
20 #endif
21
22 #ifdef SUPPORT_CRYPTEQ
23 #ifdef CRYPT_H
24 #include <crypt.h>
25 #endif
26 #ifndef HAVE_CRYPT16
27 extern char* crypt16(char*, char*);
28 #endif
29 #endif
30
31 #ifdef LOOKUP_LDAP
32 #include "lookups/ldap.h"
33 #endif
34
35
36
37 /* Recursively called function */
38
39 static uschar *expand_string_internal(uschar *, BOOL, uschar **, BOOL);
40
41
42
43 /*************************************************
44 * Local statics and tables *
45 *************************************************/
46
47 /* Table of item names, and corresponding switch numbers. The names must be in
48 alphabetical order. */
49
50 static uschar *item_table[] = {
51 US"extract",
52 US"hash",
53 US"hmac",
54 US"if",
55 US"length",
56 US"lookup",
57 US"nhash",
58 #ifdef EXIM_PERL
59 US"perl",
60 #endif
61 US"readfile",
62 US"readsocket",
63 US"run",
64 US"sg",
65 US"substr",
66 US"tr" };
67
68 enum {
69 EITEM_EXTRACT,
70 EITEM_HASH,
71 EITEM_HMAC,
72 EITEM_IF,
73 EITEM_LENGTH,
74 EITEM_LOOKUP,
75 EITEM_NHASH,
76 #ifdef EXIM_PERL
77 EITEM_PERL,
78 #endif
79 EITEM_READFILE,
80 EITEM_READSOCK,
81 EITEM_RUN,
82 EITEM_SG,
83 EITEM_SUBSTR,
84 EITEM_TR };
85
86 /* Tables of operator names, and corresponding switch numbers. The names must be
87 in alphabetical order. There are two tables, because underscore is used in some
88 cases to introduce arguments, whereas for other it is part of the name. This is
89 an historical mis-design. */
90
91 static uschar *op_table_underscore[] = {
92 US"from_utf8",
93 US"local_part",
94 US"quote_local_part",
95 US"time_interval"};
96
97 enum {
98 EOP_FROM_UTF8,
99 EOP_LOCAL_PART,
100 EOP_QUOTE_LOCAL_PART,
101 EOP_TIME_INTERVAL };
102
103 static uschar *op_table_main[] = {
104 US"address",
105 US"base62",
106 US"base62d",
107 US"domain",
108 US"escape",
109 US"eval",
110 US"eval10",
111 US"expand",
112 US"h",
113 US"hash",
114 US"hex2b64",
115 US"l",
116 US"lc",
117 US"length",
118 US"mask",
119 US"md5",
120 US"nh",
121 US"nhash",
122 US"quote",
123 US"rfc2047",
124 US"rxquote",
125 US"s",
126 US"sha1",
127 US"stat",
128 US"str2b64",
129 US"strlen",
130 US"substr",
131 US"uc" };
132
133 enum {
134 EOP_ADDRESS = sizeof(op_table_underscore)/sizeof(uschar *),
135 EOP_BASE62,
136 EOP_BASE62D,
137 EOP_DOMAIN,
138 EOP_ESCAPE,
139 EOP_EVAL,
140 EOP_EVAL10,
141 EOP_EXPAND,
142 EOP_H,
143 EOP_HASH,
144 EOP_HEX2B64,
145 EOP_L,
146 EOP_LC,
147 EOP_LENGTH,
148 EOP_MASK,
149 EOP_MD5,
150 EOP_NH,
151 EOP_NHASH,
152 EOP_QUOTE,
153 EOP_RFC2047,
154 EOP_RXQUOTE,
155 EOP_S,
156 EOP_SHA1,
157 EOP_STAT,
158 EOP_STR2B64,
159 EOP_STRLEN,
160 EOP_SUBSTR,
161 EOP_UC };
162
163
164 /* Table of condition names, and corresponding switch numbers. The names must
165 be in alphabetical order. */
166
167 static uschar *cond_table[] = {
168 US"<",
169 US"<=",
170 US"=",
171 US"==", /* Backward compatibility */
172 US">",
173 US">=",
174 US"and",
175 US"crypteq",
176 US"def",
177 US"eq",
178 US"eqi",
179 US"exists",
180 US"first_delivery",
181 US"ge",
182 US"gei",
183 US"gt",
184 US"gti",
185 US"isip",
186 US"isip4",
187 US"isip6",
188 US"ldapauth",
189 US"le",
190 US"lei",
191 US"lt",
192 US"lti",
193 US"match",
194 US"match_address",
195 US"match_domain",
196 US"match_local_part",
197 US"or",
198 US"pam",
199 US"pwcheck",
200 US"queue_running",
201 US"radius",
202 US"saslauthd"
203 };
204
205 enum {
206 ECOND_NUM_L,
207 ECOND_NUM_LE,
208 ECOND_NUM_E,
209 ECOND_NUM_EE,
210 ECOND_NUM_G,
211 ECOND_NUM_GE,
212 ECOND_AND,
213 ECOND_CRYPTEQ,
214 ECOND_DEF,
215 ECOND_STR_EQ,
216 ECOND_STR_EQI,
217 ECOND_EXISTS,
218 ECOND_FIRST_DELIVERY,
219 ECOND_STR_GE,
220 ECOND_STR_GEI,
221 ECOND_STR_GT,
222 ECOND_STR_GTI,
223 ECOND_ISIP,
224 ECOND_ISIP4,
225 ECOND_ISIP6,
226 ECOND_LDAPAUTH,
227 ECOND_STR_LE,
228 ECOND_STR_LEI,
229 ECOND_STR_LT,
230 ECOND_STR_LTI,
231 ECOND_MATCH,
232 ECOND_MATCH_ADDRESS,
233 ECOND_MATCH_DOMAIN,
234 ECOND_MATCH_LOCAL_PART,
235 ECOND_OR,
236 ECOND_PAM,
237 ECOND_PWCHECK,
238 ECOND_QUEUE_RUNNING,
239 ECOND_RADIUS,
240 ECOND_SASLAUTHD
241 };
242
243
244 /* Type for main variable table */
245
246 typedef struct {
247 char *name;
248 int type;
249 void *value;
250 } var_entry;
251
252 /* Type for entries pointing to address/length pairs. Not currently
253 in use. */
254
255 typedef struct {
256 uschar **address;
257 int *length;
258 } alblock;
259
260 /* Types of table entry */
261
262 enum {
263 vtype_int, /* value is address of int */
264 vtype_filter_int, /* ditto, but recognized only when filtering */
265 vtype_ino, /* value is address of ino_t (not always an int) */
266 vtype_uid, /* value is address of uid_t (not always an int) */
267 vtype_gid, /* value is address of gid_t (not always an int) */
268 vtype_stringptr, /* value is address of pointer to string */
269 vtype_msgbody, /* as stringptr, but read when first required */
270 vtype_msgbody_end, /* ditto, the end of the message */
271 vtype_msgheaders, /* the message's headers */
272 vtype_localpart, /* extract local part from string */
273 vtype_domain, /* extract domain from string */
274 vtype_recipients, /* extract recipients from recipients list */
275 /* (enabled only during system filtering */
276 vtype_todbsdin, /* value not used; generate BSD inbox tod */
277 vtype_tode, /* value not used; generate tod in epoch format */
278 vtype_todf, /* value not used; generate full tod */
279 vtype_todl, /* value not used; generate log tod */
280 vtype_todlf, /* value not used; generate log file datestamp tod */
281 vtype_todzone, /* value not used; generate time zone only */
282 vtype_todzulu, /* value not used; generate zulu tod */
283 vtype_reply, /* value not used; get reply from headers */
284 vtype_pid, /* value not used; result is pid */
285 vtype_host_lookup, /* value not used; get host name */
286 vtype_load_avg, /* value not used; result is int from os_getloadavg */
287 vtype_pspace, /* partition space; value is T/F for spool/log */
288 vtype_pinodes /* partition inodes; value is T/F for spool/log */
289 };
290
291 /* This table must be kept in alphabetical order. */
292
293 static var_entry var_table[] = {
294 { "acl_c0", vtype_stringptr, &acl_var[0] },
295 { "acl_c1", vtype_stringptr, &acl_var[1] },
296 { "acl_c2", vtype_stringptr, &acl_var[2] },
297 { "acl_c3", vtype_stringptr, &acl_var[3] },
298 { "acl_c4", vtype_stringptr, &acl_var[4] },
299 { "acl_c5", vtype_stringptr, &acl_var[5] },
300 { "acl_c6", vtype_stringptr, &acl_var[6] },
301 { "acl_c7", vtype_stringptr, &acl_var[7] },
302 { "acl_c8", vtype_stringptr, &acl_var[8] },
303 { "acl_c9", vtype_stringptr, &acl_var[9] },
304 { "acl_m0", vtype_stringptr, &acl_var[10] },
305 { "acl_m1", vtype_stringptr, &acl_var[11] },
306 { "acl_m2", vtype_stringptr, &acl_var[12] },
307 { "acl_m3", vtype_stringptr, &acl_var[13] },
308 { "acl_m4", vtype_stringptr, &acl_var[14] },
309 { "acl_m5", vtype_stringptr, &acl_var[15] },
310 { "acl_m6", vtype_stringptr, &acl_var[16] },
311 { "acl_m7", vtype_stringptr, &acl_var[17] },
312 { "acl_m8", vtype_stringptr, &acl_var[18] },
313 { "acl_m9", vtype_stringptr, &acl_var[19] },
314 { "acl_verify_message", vtype_stringptr, &acl_verify_message },
315 { "address_data", vtype_stringptr, &deliver_address_data },
316 { "address_file", vtype_stringptr, &address_file },
317 { "address_pipe", vtype_stringptr, &address_pipe },
318 { "authenticated_id", vtype_stringptr, &authenticated_id },
319 { "authenticated_sender",vtype_stringptr, &authenticated_sender },
320 { "authentication_failed",vtype_int, &authentication_failed },
321 #ifdef EXPERIMENTAL_BRIGHTMAIL
322 { "bmi_alt_location", vtype_stringptr, &bmi_alt_location },
323 { "bmi_base64_tracker_verdict", vtype_stringptr, &bmi_base64_tracker_verdict },
324 { "bmi_base64_verdict", vtype_stringptr, &bmi_base64_verdict },
325 { "bmi_deliver", vtype_int, &bmi_deliver },
326 #endif
327 { "body_linecount", vtype_int, &body_linecount },
328 { "body_zerocount", vtype_int, &body_zerocount },
329 { "bounce_recipient", vtype_stringptr, &bounce_recipient },
330 { "bounce_return_size_limit", vtype_int, &bounce_return_size_limit },
331 { "caller_gid", vtype_gid, &real_gid },
332 { "caller_uid", vtype_uid, &real_uid },
333 { "compile_date", vtype_stringptr, &version_date },
334 { "compile_number", vtype_stringptr, &version_cnumber },
335 #ifdef WITH_OLD_DEMIME
336 { "demime_errorlevel", vtype_int, &demime_errorlevel },
337 { "demime_reason", vtype_stringptr, &demime_reason },
338 #endif
339 { "dnslist_domain", vtype_stringptr, &dnslist_domain },
340 { "dnslist_text", vtype_stringptr, &dnslist_text },
341 { "dnslist_value", vtype_stringptr, &dnslist_value },
342 { "domain", vtype_stringptr, &deliver_domain },
343 { "domain_data", vtype_stringptr, &deliver_domain_data },
344 { "exim_gid", vtype_gid, &exim_gid },
345 { "exim_path", vtype_stringptr, &exim_path },
346 { "exim_uid", vtype_uid, &exim_uid },
347 #ifdef WITH_OLD_DEMIME
348 { "found_extension", vtype_stringptr, &found_extension },
349 #endif
350 { "home", vtype_stringptr, &deliver_home },
351 { "host", vtype_stringptr, &deliver_host },
352 { "host_address", vtype_stringptr, &deliver_host_address },
353 { "host_data", vtype_stringptr, &host_data },
354 { "host_lookup_failed", vtype_int, &host_lookup_failed },
355 { "inode", vtype_ino, &deliver_inode },
356 { "interface_address", vtype_stringptr, &interface_address },
357 { "interface_port", vtype_int, &interface_port },
358 #ifdef LOOKUP_LDAP
359 { "ldap_dn", vtype_stringptr, &eldap_dn },
360 #endif
361 { "load_average", vtype_load_avg, NULL },
362 { "local_part", vtype_stringptr, &deliver_localpart },
363 { "local_part_data", vtype_stringptr, &deliver_localpart_data },
364 { "local_part_prefix", vtype_stringptr, &deliver_localpart_prefix },
365 { "local_part_suffix", vtype_stringptr, &deliver_localpart_suffix },
366 { "local_scan_data", vtype_stringptr, &local_scan_data },
367 { "local_user_gid", vtype_gid, &local_user_gid },
368 { "local_user_uid", vtype_uid, &local_user_uid },
369 { "localhost_number", vtype_int, &host_number },
370 { "log_inodes", vtype_pinodes, (void *)FALSE },
371 { "log_space", vtype_pspace, (void *)FALSE },
372 { "mailstore_basename", vtype_stringptr, &mailstore_basename },
373 #ifdef WITH_CONTENT_SCAN
374 { "malware_name", vtype_stringptr, &malware_name },
375 #endif
376 { "message_age", vtype_int, &message_age },
377 { "message_body", vtype_msgbody, &message_body },
378 { "message_body_end", vtype_msgbody_end, &message_body_end },
379 { "message_body_size", vtype_int, &message_body_size },
380 { "message_headers", vtype_msgheaders, NULL },
381 { "message_id", vtype_stringptr, &message_id },
382 { "message_size", vtype_int, &message_size },
383 #ifdef WITH_CONTENT_SCAN
384 { "mime_anomaly_level", vtype_int, &mime_anomaly_level },
385 { "mime_anomaly_text", vtype_stringptr, &mime_anomaly_text },
386 { "mime_boundary", vtype_stringptr, &mime_boundary },
387 { "mime_charset", vtype_stringptr, &mime_charset },
388 { "mime_content_description", vtype_stringptr, &mime_content_description },
389 { "mime_content_disposition", vtype_stringptr, &mime_content_disposition },
390 { "mime_content_id", vtype_stringptr, &mime_content_id },
391 { "mime_content_size", vtype_int, &mime_content_size },
392 { "mime_content_transfer_encoding",vtype_stringptr, &mime_content_transfer_encoding },
393 { "mime_content_type", vtype_stringptr, &mime_content_type },
394 { "mime_decoded_filename", vtype_stringptr, &mime_decoded_filename },
395 { "mime_filename", vtype_stringptr, &mime_filename },
396 { "mime_is_coverletter", vtype_int, &mime_is_coverletter },
397 { "mime_is_multipart", vtype_int, &mime_is_multipart },
398 { "mime_is_rfc822", vtype_int, &mime_is_rfc822 },
399 { "mime_part_count", vtype_int, &mime_part_count },
400 #endif
401 { "n0", vtype_filter_int, &filter_n[0] },
402 { "n1", vtype_filter_int, &filter_n[1] },
403 { "n2", vtype_filter_int, &filter_n[2] },
404 { "n3", vtype_filter_int, &filter_n[3] },
405 { "n4", vtype_filter_int, &filter_n[4] },
406 { "n5", vtype_filter_int, &filter_n[5] },
407 { "n6", vtype_filter_int, &filter_n[6] },
408 { "n7", vtype_filter_int, &filter_n[7] },
409 { "n8", vtype_filter_int, &filter_n[8] },
410 { "n9", vtype_filter_int, &filter_n[9] },
411 { "original_domain", vtype_stringptr, &deliver_domain_orig },
412 { "original_local_part", vtype_stringptr, &deliver_localpart_orig },
413 { "originator_gid", vtype_gid, &originator_gid },
414 { "originator_uid", vtype_uid, &originator_uid },
415 { "parent_domain", vtype_stringptr, &deliver_domain_parent },
416 { "parent_local_part", vtype_stringptr, &deliver_localpart_parent },
417 { "pid", vtype_pid, NULL },
418 { "primary_hostname", vtype_stringptr, &primary_hostname },
419 { "qualify_domain", vtype_stringptr, &qualify_domain_sender },
420 { "qualify_recipient", vtype_stringptr, &qualify_domain_recipient },
421 { "rcpt_count", vtype_int, &rcpt_count },
422 { "rcpt_defer_count", vtype_int, &rcpt_defer_count },
423 { "rcpt_fail_count", vtype_int, &rcpt_fail_count },
424 { "received_count", vtype_int, &received_count },
425 { "received_for", vtype_stringptr, &received_for },
426 { "received_protocol", vtype_stringptr, &received_protocol },
427 { "recipient_data", vtype_stringptr, &recipient_data },
428 { "recipient_verify_failure",vtype_stringptr,&recipient_verify_failure },
429 { "recipients", vtype_recipients, NULL },
430 { "recipients_count", vtype_int, &recipients_count },
431 #ifdef WITH_CONTENT_SCAN
432 { "regex_match_string", vtype_stringptr, &regex_match_string },
433 #endif
434 { "reply_address", vtype_reply, NULL },
435 { "return_path", vtype_stringptr, &return_path },
436 { "return_size_limit", vtype_int, &bounce_return_size_limit },
437 { "runrc", vtype_int, &runrc },
438 { "self_hostname", vtype_stringptr, &self_hostname },
439 { "sender_address", vtype_stringptr, &sender_address },
440 { "sender_address_data", vtype_stringptr, &sender_address_data },
441 { "sender_address_domain", vtype_domain, &sender_address },
442 { "sender_address_local_part", vtype_localpart, &sender_address },
443 { "sender_data", vtype_stringptr, &sender_data },
444 { "sender_fullhost", vtype_stringptr, &sender_fullhost },
445 { "sender_helo_name", vtype_stringptr, &sender_helo_name },
446 { "sender_host_address", vtype_stringptr, &sender_host_address },
447 { "sender_host_authenticated",vtype_stringptr, &sender_host_authenticated },
448 { "sender_host_name", vtype_host_lookup, NULL },
449 { "sender_host_port", vtype_int, &sender_host_port },
450 { "sender_ident", vtype_stringptr, &sender_ident },
451 { "sender_rcvhost", vtype_stringptr, &sender_rcvhost },
452 { "sender_verify_failure",vtype_stringptr, &sender_verify_failure },
453 { "smtp_command_argument", vtype_stringptr, &smtp_command_argument },
454 { "sn0", vtype_filter_int, &filter_sn[0] },
455 { "sn1", vtype_filter_int, &filter_sn[1] },
456 { "sn2", vtype_filter_int, &filter_sn[2] },
457 { "sn3", vtype_filter_int, &filter_sn[3] },
458 { "sn4", vtype_filter_int, &filter_sn[4] },
459 { "sn5", vtype_filter_int, &filter_sn[5] },
460 { "sn6", vtype_filter_int, &filter_sn[6] },
461 { "sn7", vtype_filter_int, &filter_sn[7] },
462 { "sn8", vtype_filter_int, &filter_sn[8] },
463 { "sn9", vtype_filter_int, &filter_sn[9] },
464 #ifdef WITH_CONTENT_SCAN
465 { "spam_bar", vtype_stringptr, &spam_bar },
466 { "spam_report", vtype_stringptr, &spam_report },
467 { "spam_score", vtype_stringptr, &spam_score },
468 { "spam_score_int", vtype_stringptr, &spam_score_int },
469 #endif
470 #ifdef EXPERIMENTAL_SPF
471 { "spf_header_comment", vtype_stringptr, &spf_header_comment },
472 { "spf_received", vtype_stringptr, &spf_received },
473 { "spf_result", vtype_stringptr, &spf_result },
474 { "spf_smtp_comment", vtype_stringptr, &spf_smtp_comment },
475 #endif
476 { "spool_directory", vtype_stringptr, &spool_directory },
477 { "spool_inodes", vtype_pinodes, (void *)TRUE },
478 { "spool_space", vtype_pspace, (void *)TRUE },
479 #ifdef EXPERIMENTAL_SRS
480 { "srs_db_address", vtype_stringptr, &srs_db_address },
481 { "srs_db_key", vtype_stringptr, &srs_db_key },
482 { "srs_orig_recipient", vtype_stringptr, &srs_orig_recipient },
483 { "srs_orig_sender", vtype_stringptr, &srs_orig_sender },
484 { "srs_recipient", vtype_stringptr, &srs_recipient },
485 { "srs_status", vtype_stringptr, &srs_status },
486 #endif
487 { "thisaddress", vtype_stringptr, &filter_thisaddress },
488 { "tls_certificate_verified", vtype_int, &tls_certificate_verified },
489 { "tls_cipher", vtype_stringptr, &tls_cipher },
490 { "tls_peerdn", vtype_stringptr, &tls_peerdn },
491 { "tod_bsdinbox", vtype_todbsdin, NULL },
492 { "tod_epoch", vtype_tode, NULL },
493 { "tod_full", vtype_todf, NULL },
494 { "tod_log", vtype_todl, NULL },
495 { "tod_logfile", vtype_todlf, NULL },
496 { "tod_zone", vtype_todzone, NULL },
497 { "tod_zulu", vtype_todzulu, NULL },
498 { "value", vtype_stringptr, &lookup_value },
499 { "version_number", vtype_stringptr, &version_string },
500 { "warn_message_delay", vtype_stringptr, &warnmsg_delay },
501 { "warn_message_recipient",vtype_stringptr, &warnmsg_recipients },
502 { "warn_message_recipients",vtype_stringptr,&warnmsg_recipients },
503 { "warnmsg_delay", vtype_stringptr, &warnmsg_delay },
504 { "warnmsg_recipient", vtype_stringptr, &warnmsg_recipients },
505 { "warnmsg_recipients", vtype_stringptr, &warnmsg_recipients }
506 };
507
508 static int var_table_size = sizeof(var_table)/sizeof(var_entry);
509 static uschar var_buffer[256];
510 static BOOL malformed_header;
511
512 /* For textual hashes */
513
514 static char *hashcodes = "abcdefghijklmnopqrtsuvwxyz"
515 "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
516 "0123456789";
517
518 enum { HMAC_MD5, HMAC_SHA1 };
519
520 /* For numeric hashes */
521
522 static unsigned int prime[] = {
523 2, 3, 5, 7, 11, 13, 17, 19, 23, 29,
524 31, 37, 41, 43, 47, 53, 59, 61, 67, 71,
525 73, 79, 83, 89, 97, 101, 103, 107, 109, 113};
526
527 /* For printing modes in symbolic form */
528
529 static uschar *mtable_normal[] =
530 { US"---", US"--x", US"-w-", US"-wx", US"r--", US"r-x", US"rw-", US"rwx" };
531
532 static uschar *mtable_setid[] =
533 { US"--S", US"--s", US"-wS", US"-ws", US"r-S", US"r-s", US"rwS", US"rws" };
534
535 static uschar *mtable_sticky[] =
536 { US"--T", US"--t", US"-wT", US"-wt", US"r-T", US"r-t", US"rwT", US"rwt" };
537
538
539
540 /*************************************************
541 * Tables for UTF-8 support *
542 *************************************************/
543
544 /* Table of the number of extra characters, indexed by the first character
545 masked with 0x3f. The highest number for a valid UTF-8 character is in fact
546 0x3d. */
547
548 static uschar utf8_table1[] = {
549 1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,
550 1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,
551 2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,
552 3,3,3,3,3,3,3,3,4,4,4,4,5,5,5,5 };
553
554 /* These are the masks for the data bits in the first byte of a character,
555 indexed by the number of additional bytes. */
556
557 static int utf8_table2[] = { 0xff, 0x1f, 0x0f, 0x07, 0x03, 0x01};
558
559 /* Get the next UTF-8 character, advancing the pointer. */
560
561 #define GETUTF8INC(c, ptr) \
562 c = *ptr++; \
563 if ((c & 0xc0) == 0xc0) \
564 { \
565 int a = utf8_table1[c & 0x3f]; /* Number of additional bytes */ \
566 int s = 6*a; \
567 c = (c & utf8_table2[a]) << s; \
568 while (a-- > 0) \
569 { \
570 s -= 6; \
571 c |= (*ptr++ & 0x3f) << s; \
572 } \
573 }
574
575
576 /*************************************************
577 * Binary chop search on a table *
578 *************************************************/
579
580 /* This is used for matching expansion items and operators.
581
582 Arguments:
583 name the name that is being sought
584 table the table to search
585 table_size the number of items in the table
586
587 Returns: the offset in the table, or -1
588 */
589
590 static int
591 chop_match(uschar *name, uschar **table, int table_size)
592 {
593 uschar **bot = table;
594 uschar **top = table + table_size;
595
596 while (top > bot)
597 {
598 uschar **mid = bot + (top - bot)/2;
599 int c = Ustrcmp(name, *mid);
600 if (c == 0) return mid - table;
601 if (c > 0) bot = mid + 1; else top = mid;
602 }
603
604 return -1;
605 }
606
607
608
609 /*************************************************
610 * Check a condition string *
611 *************************************************/
612
613 /* This function is called to expand a string, and test the result for a "true"
614 or "false" value. Failure of the expansion yields FALSE; logged unless it was a
615 forced fail or lookup defer. All store used by the function can be released on
616 exit.
617
618 Arguments:
619 condition the condition string
620 m1 text to be incorporated in panic error
621 m2 ditto
622
623 Returns: TRUE if condition is met, FALSE if not
624 */
625
626 BOOL
627 expand_check_condition(uschar *condition, uschar *m1, uschar *m2)
628 {
629 int rc;
630 void *reset_point = store_get(0);
631 uschar *ss = expand_string(condition);
632 if (ss == NULL)
633 {
634 if (!expand_string_forcedfail && !search_find_defer)
635 log_write(0, LOG_MAIN|LOG_PANIC, "failed to expand condition \"%s\" "
636 "for %s %s: %s", condition, m1, m2, expand_string_message);
637 return FALSE;
638 }
639 rc = ss[0] != 0 && Ustrcmp(ss, "0") != 0 && strcmpic(ss, US"no") != 0 &&
640 strcmpic(ss, US"false") != 0;
641 store_reset(reset_point);
642 return rc;
643 }
644
645
646
647 /*************************************************
648 * Pick out a name from a string *
649 *************************************************/
650
651 /* If the name is too long, it is silently truncated.
652
653 Arguments:
654 name points to a buffer into which to put the name
655 max is the length of the buffer
656 s points to the first alphabetic character of the name
657 extras chars other than alphanumerics to permit
658
659 Returns: pointer to the first character after the name
660
661 Note: The test for *s != 0 in the while loop is necessary because
662 Ustrchr() yields non-NULL if the character is zero (which is not something
663 I expected). */
664
665 static uschar *
666 read_name(uschar *name, int max, uschar *s, uschar *extras)
667 {
668 int ptr = 0;
669 while (*s != 0 && (isalnum(*s) || Ustrchr(extras, *s) != NULL))
670 {
671 if (ptr < max-1) name[ptr++] = *s;
672 s++;
673 }
674 name[ptr] = 0;
675 return s;
676 }
677
678
679
680 /*************************************************
681 * Pick out the rest of a header name *
682 *************************************************/
683
684 /* A variable name starting $header_ (or just $h_ for those who like
685 abbreviations) might not be the complete header name because headers can
686 contain any printing characters in their names, except ':'. This function is
687 called to read the rest of the name, chop h[eader]_ off the front, and put ':'
688 on the end, if the name was terminated by white space.
689
690 Arguments:
691 name points to a buffer in which the name read so far exists
692 max is the length of the buffer
693 s points to the first character after the name so far, i.e. the
694 first non-alphameric character after $header_xxxxx
695
696 Returns: a pointer to the first character after the header name
697 */
698
699 static uschar *
700 read_header_name(uschar *name, int max, uschar *s)
701 {
702 int prelen = Ustrchr(name, '_') - name + 1;
703 int ptr = Ustrlen(name) - prelen;
704 if (ptr > 0) memmove(name, name+prelen, ptr);
705 while (mac_isgraph(*s) && *s != ':')
706 {
707 if (ptr < max-1) name[ptr++] = *s;
708 s++;
709 }
710 if (*s == ':') s++;
711 name[ptr++] = ':';
712 name[ptr] = 0;
713 return s;
714 }
715
716
717
718 /*************************************************
719 * Pick out a number from a string *
720 *************************************************/
721
722 /* Arguments:
723 n points to an integer into which to put the number
724 s points to the first digit of the number
725
726 Returns: a pointer to the character after the last digit
727 */
728
729 static uschar *
730 read_number(int *n, uschar *s)
731 {
732 *n = 0;
733 while (isdigit(*s)) *n = *n * 10 + (*s++ - '0');
734 return s;
735 }
736
737
738
739 /*************************************************
740 * Extract keyed subfield from a string *
741 *************************************************/
742
743 /* The yield is in dynamic store; NULL means that the key was not found.
744
745 Arguments:
746 key points to the name of the key
747 s points to the string from which to extract the subfield
748
749 Returns: NULL if the subfield was not found, or
750 a pointer to the subfield's data
751 */
752
753 static uschar *
754 expand_getkeyed(uschar *key, uschar *s)
755 {
756 int length = Ustrlen(key);
757 while (isspace(*s)) s++;
758
759 /* Loop to search for the key */
760
761 while (*s != 0)
762 {
763 int dkeylength;
764 uschar *data;
765 uschar *dkey = s;
766
767 while (*s != 0 && *s != '=' && !isspace(*s)) s++;
768 dkeylength = s - dkey;
769 while (isspace(*s)) s++;
770 if (*s == '=') while (isspace((*(++s))));
771
772 data = string_dequote(&s);
773 if (length == dkeylength && strncmpic(key, dkey, length) == 0)
774 return data;
775
776 while (isspace(*s)) s++;
777 }
778
779 return NULL;
780 }
781
782
783
784
785 /*************************************************
786 * Extract numbered subfield from string *
787 *************************************************/
788
789 /* Extracts a numbered field from a string that is divided by tokens - for
790 example a line from /etc/passwd is divided by colon characters. First field is
791 numbered one. Negative arguments count from the right. Zero returns the whole
792 string. Returns NULL if there are insufficient tokens in the string
793
794 ***WARNING***
795 Modifies final argument - this is a dynamically generated string, so that's OK.
796
797 Arguments:
798 field number of field to be extracted,
799 first field = 1, whole string = 0, last field = -1
800 separators characters that are used to break string into tokens
801 s points to the string from which to extract the subfield
802
803 Returns: NULL if the field was not found,
804 a pointer to the field's data inside s (modified to add 0)
805 */
806
807 static uschar *
808 expand_gettokened (int field, uschar *separators, uschar *s)
809 {
810 int sep = 1;
811 int count;
812 uschar *ss = s;
813 uschar *fieldtext = NULL;
814
815 if (field == 0) return s;
816
817 /* Break the line up into fields in place; for field > 0 we stop when we have
818 done the number of fields we want. For field < 0 we continue till the end of
819 the string, counting the number of fields. */
820
821 count = (field > 0)? field : INT_MAX;
822
823 while (count-- > 0)
824 {
825 size_t len;
826
827 /* Previous field was the last one in the string. For a positive field
828 number, this means there are not enough fields. For a negative field number,
829 check that there are enough, and scan back to find the one that is wanted. */
830
831 if (sep == 0)
832 {
833 if (field > 0 || (-field) > (INT_MAX - count - 1)) return NULL;
834 if ((-field) == (INT_MAX - count - 1)) return s;
835 while (field++ < 0)
836 {
837 ss--;
838 while (ss[-1] != 0) ss--;
839 }
840 fieldtext = ss;
841 break;
842 }
843
844 /* Previous field was not last in the string; save its start and put a
845 zero at its end. */
846
847 fieldtext = ss;
848 len = Ustrcspn(ss, separators);
849 sep = ss[len];
850 ss[len] = 0;
851 ss += len + 1;
852 }
853
854 return fieldtext;
855 }
856
857
858
859 /*************************************************
860 * Extract a substring from a string *
861 *************************************************/
862
863 /* Perform the ${substr or ${length expansion operations.
864
865 Arguments:
866 subject the input string
867 value1 the offset from the start of the input string to the start of
868 the output string; if negative, count from the right.
869 value2 the length of the output string, or negative (-1) for unset
870 if value1 is positive, unset means "all after"
871 if value1 is negative, unset means "all before"
872 len set to the length of the returned string
873
874 Returns: pointer to the output string, or NULL if there is an error
875 */
876
877 static uschar *
878 extract_substr(uschar *subject, int value1, int value2, int *len)
879 {
880 int sublen = Ustrlen(subject);
881
882 if (value1 < 0) /* count from right */
883 {
884 value1 += sublen;
885
886 /* If the position is before the start, skip to the start, and adjust the
887 length. If the length ends up negative, the substring is null because nothing
888 can precede. This falls out naturally when the length is unset, meaning "all
889 to the left". */
890
891 if (value1 < 0)
892 {
893 value2 += value1;
894 if (value2 < 0) value2 = 0;
895 value1 = 0;
896 }
897
898 /* Otherwise an unset length => characters before value1 */
899
900 else if (value2 < 0)
901 {
902 value2 = value1;
903 value1 = 0;
904 }
905 }
906
907 /* For a non-negative offset, if the starting position is past the end of the
908 string, the result will be the null string. Otherwise, an unset length means
909 "rest"; just set it to the maximum - it will be cut down below if necessary. */
910
911 else
912 {
913 if (value1 > sublen)
914 {
915 value1 = sublen;
916 value2 = 0;
917 }
918 else if (value2 < 0) value2 = sublen;
919 }
920
921 /* Cut the length down to the maximum possible for the offset value, and get
922 the required characters. */
923
924 if (value1 + value2 > sublen) value2 = sublen - value1;
925 *len = value2;
926 return subject + value1;
927 }
928
929
930
931
932 /*************************************************
933 * Old-style hash of a string *
934 *************************************************/
935
936 /* Perform the ${hash expansion operation.
937
938 Arguments:
939 subject the input string (an expanded substring)
940 value1 the length of the output string; if greater or equal to the
941 length of the input string, the input string is returned
942 value2 the number of hash characters to use, or 26 if negative
943 len set to the length of the returned string
944
945 Returns: pointer to the output string, or NULL if there is an error
946 */
947
948 static uschar *
949 compute_hash(uschar *subject, int value1, int value2, int *len)
950 {
951 int sublen = Ustrlen(subject);
952
953 if (value2 < 0) value2 = 26;
954 else if (value2 > Ustrlen(hashcodes))
955 {
956 expand_string_message =
957 string_sprintf("hash count \"%d\" too big", value2);
958 return NULL;
959 }
960
961 /* Calculate the hash text. We know it is shorter than the original string, so
962 can safely place it in subject[] (we know that subject is always itself an
963 expanded substring). */
964
965 if (value1 < sublen)
966 {
967 int c;
968 int i = 0;
969 int j = value1;
970 while ((c = (subject[j])) != 0)
971 {
972 int shift = (c + j++) & 7;
973 subject[i] ^= (c << shift) | (c >> (8-shift));
974 if (++i >= value1) i = 0;
975 }
976 for (i = 0; i < value1; i++)
977 subject[i] = hashcodes[(subject[i]) % value2];
978 }
979 else value1 = sublen;
980
981 *len = value1;
982 return subject;
983 }
984
985
986
987
988 /*************************************************
989 * Numeric hash of a string *
990 *************************************************/
991
992 /* Perform the ${nhash expansion operation. The first characters of the
993 string are treated as most important, and get the highest prime numbers.
994
995 Arguments:
996 subject the input string
997 value1 the maximum value of the first part of the result
998 value2 the maximum value of the second part of the result,
999 or negative to produce only a one-part result
1000 len set to the length of the returned string
1001
1002 Returns: pointer to the output string, or NULL if there is an error.
1003 */
1004
1005 static uschar *
1006 compute_nhash (uschar *subject, int value1, int value2, int *len)
1007 {
1008 uschar *s = subject;
1009 int i = 0;
1010 unsigned long int total = 0; /* no overflow */
1011
1012 while (*s != 0)
1013 {
1014 if (i == 0) i = sizeof(prime)/sizeof(int) - 1;
1015 total += prime[i--] * (unsigned int)(*s++);
1016 }
1017
1018 /* If value2 is unset, just compute one number */
1019
1020 if (value2 < 0)
1021 {
1022 s = string_sprintf("%d", total % value1);
1023 }
1024
1025 /* Otherwise do a div/mod hash */
1026
1027 else
1028 {
1029 total = total % (value1 * value2);
1030 s = string_sprintf("%d/%d", total/value2, total % value2);
1031 }
1032
1033 *len = Ustrlen(s);
1034 return s;
1035 }
1036
1037
1038
1039
1040
1041 /*************************************************
1042 * Find the value of a header or headers *
1043 *************************************************/
1044
1045 /* Multiple instances of the same header get concatenated, and this function
1046 can also return a concatenation of all the header lines. When concatenating
1047 specific headers that contain lists of addresses, a comma is inserted between
1048 them. Otherwise we use a straight concatenation. Because some messages can have
1049 pathologically large number of lines, there is a limit on the length that is
1050 returned. Also, to avoid massive store use which would result from using
1051 string_cat() as it copies and extends strings, we do a preliminary pass to find
1052 out exactly how much store will be needed. On "normal" messages this will be
1053 pretty trivial.
1054
1055 Arguments:
1056 name the name of the header, without the leading $header_ or $h_,
1057 or NULL if a concatenation of all headers is required
1058 exists_only TRUE if called from a def: test; don't need to build a string;
1059 just return a string that is not "" and not "0" if the header
1060 exists
1061 newsize return the size of memory block that was obtained; may be NULL
1062 if exists_only is TRUE
1063 want_raw TRUE if called for $rh_ or $rheader_ variables; no processing,
1064 other than concatenating, will be done on the header
1065 charset name of charset to translate MIME words to; used only if
1066 want_raw is false; if NULL, no translation is done (this is
1067 used for $bh_ and $bheader_)
1068
1069 Returns: NULL if the header does not exist, else a pointer to a new
1070 store block
1071 */
1072
1073 static uschar *
1074 find_header(uschar *name, BOOL exists_only, int *newsize, BOOL want_raw,
1075 uschar *charset)
1076 {
1077 BOOL found = name == NULL;
1078 int comma = 0;
1079 int len = found? 0 : Ustrlen(name);
1080 int i;
1081 uschar *yield = NULL;
1082 uschar *ptr = NULL;
1083
1084 /* Loop for two passes - saves code repetition */
1085
1086 for (i = 0; i < 2; i++)
1087 {
1088 int size = 0;
1089 header_line *h;
1090
1091 for (h = header_list; size < header_insert_maxlen && h != NULL; h = h->next)
1092 {
1093 if (h->type != htype_old && h->text != NULL) /* NULL => Received: placeholder */
1094 {
1095 if (name == NULL || (len <= h->slen && strncmpic(name, h->text, len) == 0))
1096 {
1097 int ilen;
1098 uschar *t;
1099
1100 if (exists_only) return US"1"; /* don't need actual string */
1101 found = TRUE;
1102 t = h->text + len; /* text to insert */
1103 if (!want_raw) /* unless wanted raw, */
1104 while (isspace(*t)) t++; /* remove leading white space */
1105 ilen = h->slen - (t - h->text); /* length to insert */
1106
1107 /* Set comma = 1 if handling a single header and it's one of those
1108 that contains an address list, except when asked for raw headers. Only
1109 need to do this once. */
1110
1111 if (!want_raw && name != NULL && comma == 0 &&
1112 Ustrchr("BCFRST", h->type) != NULL)
1113 comma = 1;
1114
1115 /* First pass - compute total store needed; second pass - compute
1116 total store used, including this header. */
1117
1118 size += ilen + comma;
1119
1120 /* Second pass - concatentate the data, up to a maximum. Note that
1121 the loop stops when size hits the limit. */
1122
1123 if (i != 0)
1124 {
1125 if (size > header_insert_maxlen)
1126 {
1127 ilen -= size - header_insert_maxlen;
1128 comma = 0;
1129 }
1130 Ustrncpy(ptr, t, ilen);
1131 ptr += ilen;
1132 if (comma != 0 && ilen > 0)
1133 {
1134 ptr[-1] = ',';
1135 *ptr++ = '\n';
1136 }
1137 }
1138 }
1139 }
1140 }
1141
1142 /* At end of first pass, truncate size if necessary, and get the buffer
1143 to hold the data, returning the buffer size. */
1144
1145 if (i == 0)
1146 {
1147 if (!found) return NULL;
1148 if (size > header_insert_maxlen) size = header_insert_maxlen;
1149 *newsize = size + 1;
1150 ptr = yield = store_get(*newsize);
1151 }
1152 }
1153
1154 /* Remove a redundant added comma if present */
1155
1156 if (comma != 0 && ptr > yield) ptr -= 2;
1157
1158 /* That's all we do for raw header expansion. */
1159
1160 if (want_raw)
1161 {
1162 *ptr = 0;
1163 }
1164
1165 /* Otherwise, we remove trailing whitespace, including newlines. Then we do RFC
1166 2047 decoding, translating the charset if requested. The rfc2047_decode2()
1167 function can return an error with decoded data if the charset translation
1168 fails. If decoding fails, it returns NULL. */
1169
1170 else
1171 {
1172 uschar *decoded, *error;
1173 while (ptr > yield && isspace(ptr[-1])) ptr--;
1174 *ptr = 0;
1175 decoded = rfc2047_decode2(yield, TRUE, charset, '?', NULL, newsize, &error);
1176 if (error != NULL)
1177 {
1178 DEBUG(D_any) debug_printf("*** error in RFC 2047 decoding: %s\n"
1179 " input was: %s\n", error, yield);
1180 }
1181 if (decoded != NULL) yield = decoded;
1182 }
1183
1184 return yield;
1185 }
1186
1187
1188
1189
1190 /*************************************************
1191 * Find value of a variable *
1192 *************************************************/
1193
1194 /* The table of variables is kept in alphabetic order, so we can search it
1195 using a binary chop. The "choplen" variable is nothing to do with the binary
1196 chop.
1197
1198 Arguments:
1199 name the name of the variable being sought
1200 exists_only TRUE if this is a def: test; passed on to find_header()
1201 skipping TRUE => skip any processing evaluation; this is not the same as
1202 exists_only because def: may test for values that are first
1203 evaluated here
1204 newsize pointer to an int which is initially zero; if the answer is in
1205 a new memory buffer, *newsize is set to its size
1206
1207 Returns: NULL if the variable does not exist, or
1208 a pointer to the variable's contents, or
1209 something non-NULL if exists_only is TRUE
1210 */
1211
1212 static uschar *
1213 find_variable(uschar *name, BOOL exists_only, BOOL skipping, int *newsize)
1214 {
1215 int first = 0;
1216 int last = var_table_size;
1217
1218 while (last > first)
1219 {
1220 uschar *s, *domain;
1221 uschar **ss;
1222 int middle = (first + last)/2;
1223 int c = Ustrcmp(name, var_table[middle].name);
1224
1225 if (c > 0) { first = middle + 1; continue; }
1226 if (c < 0) { last = middle; continue; }
1227
1228 /* Found an existing variable. If in skipping state, the value isn't needed,
1229 and we want to avoid processing (such as looking up up the host name). */
1230
1231 if (skipping) return US"";
1232
1233 switch (var_table[middle].type)
1234 {
1235 case vtype_filter_int:
1236 if (!filter_running) return NULL;
1237 /* Fall through */
1238
1239 case vtype_int:
1240 sprintf(CS var_buffer, "%d", *(int *)(var_table[middle].value)); /* Integer */
1241 return var_buffer;
1242
1243 case vtype_ino:
1244 sprintf(CS var_buffer, "%ld", (long int)(*(ino_t *)(var_table[middle].value))); /* Inode */
1245 return var_buffer;
1246
1247 case vtype_gid:
1248 sprintf(CS var_buffer, "%ld", (long int)(*(gid_t *)(var_table[middle].value))); /* gid */
1249 return var_buffer;
1250
1251 case vtype_uid:
1252 sprintf(CS var_buffer, "%ld", (long int)(*(uid_t *)(var_table[middle].value))); /* uid */
1253 return var_buffer;
1254
1255 case vtype_stringptr: /* Pointer to string */
1256 s = *((uschar **)(var_table[middle].value));
1257 return (s == NULL)? US"" : s;
1258
1259 case vtype_pid:
1260 sprintf(CS var_buffer, "%d", (int)getpid()); /* pid */
1261 return var_buffer;
1262
1263 case vtype_load_avg:
1264 sprintf(CS var_buffer, "%d", os_getloadavg()); /* load_average */
1265 return var_buffer;
1266
1267 case vtype_host_lookup: /* Lookup if not done so */
1268 if (sender_host_name == NULL && sender_host_address != NULL &&
1269 !host_lookup_failed && host_name_lookup() == OK)
1270 host_build_sender_fullhost();
1271 return (sender_host_name == NULL)? US"" : sender_host_name;
1272
1273 case vtype_localpart: /* Get local part from address */
1274 s = *((uschar **)(var_table[middle].value));
1275 if (s == NULL) return US"";
1276 domain = Ustrrchr(s, '@');
1277 if (domain == NULL) return s;
1278 if (domain - s > sizeof(var_buffer) - 1)
1279 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "local part longer than %d in "
1280 "string expansion", sizeof(var_buffer));
1281 Ustrncpy(var_buffer, s, domain - s);
1282 var_buffer[domain - s] = 0;
1283 return var_buffer;
1284
1285 case vtype_domain: /* Get domain from address */
1286 s = *((uschar **)(var_table[middle].value));
1287 if (s == NULL) return US"";
1288 domain = Ustrrchr(s, '@');
1289 return (domain == NULL)? US"" : domain + 1;
1290
1291 case vtype_msgheaders:
1292 return find_header(NULL, exists_only, newsize, FALSE, NULL);
1293
1294 case vtype_msgbody: /* Pointer to msgbody string */
1295 case vtype_msgbody_end: /* Ditto, the end of the msg */
1296 ss = (uschar **)(var_table[middle].value);
1297 if (*ss == NULL && deliver_datafile >= 0) /* Read body when needed */
1298 {
1299 uschar *body;
1300 int start_offset = SPOOL_DATA_START_OFFSET;
1301 int len = message_body_visible;
1302 if (len > message_size) len = message_size;
1303 *ss = body = store_malloc(len+1);
1304 body[0] = 0;
1305 if (var_table[middle].type == vtype_msgbody_end)
1306 {
1307 struct stat statbuf;
1308 if (fstat(deliver_datafile, &statbuf) == 0)
1309 {
1310 start_offset = statbuf.st_size - len;
1311 if (start_offset < SPOOL_DATA_START_OFFSET)
1312 start_offset = SPOOL_DATA_START_OFFSET;
1313 }
1314 }
1315 lseek(deliver_datafile, start_offset, SEEK_SET);
1316 len = read(deliver_datafile, body, len);
1317 if (len > 0)
1318 {
1319 body[len] = 0;
1320 while (len > 0)
1321 {
1322 if (body[--len] == '\n' || body[len] == 0) body[len] = ' ';
1323 }
1324 }
1325 }
1326 return (*ss == NULL)? US"" : *ss;
1327
1328 case vtype_todbsdin: /* BSD inbox time of day */
1329 return tod_stamp(tod_bsdin);
1330
1331 case vtype_tode: /* Unix epoch time of day */
1332 return tod_stamp(tod_epoch);
1333
1334 case vtype_todf: /* Full time of day */
1335 return tod_stamp(tod_full);
1336
1337 case vtype_todl: /* Log format time of day */
1338 return tod_stamp(tod_log_bare); /* (without timezone) */
1339
1340 case vtype_todzone: /* Time zone offset only */
1341 return tod_stamp(tod_zone);
1342
1343 case vtype_todzulu: /* Zulu time */
1344 return tod_stamp(tod_zulu);
1345
1346 case vtype_todlf: /* Log file datestamp tod */
1347 return tod_stamp(tod_log_datestamp);
1348
1349 case vtype_reply: /* Get reply address */
1350 s = find_header(US"reply-to:", exists_only, newsize, FALSE,
1351 headers_charset);
1352 if (s == NULL || *s == 0)
1353 s = find_header(US"from:", exists_only, newsize, FALSE, headers_charset);
1354 return (s == NULL)? US"" : s;
1355
1356 /* A recipients list is available only during system message filtering,
1357 during ACL processing after DATA, and while expanding pipe commands
1358 generated from a system filter, but not elsewhere. */
1359
1360 case vtype_recipients:
1361 if (!enable_dollar_recipients) return NULL; else
1362 {
1363 int size = 128;
1364 int ptr = 0;
1365 int i;
1366 s = store_get(size);
1367 for (i = 0; i < recipients_count; i++)
1368 {
1369 if (i != 0) s = string_cat(s, &size, &ptr, US", ", 2);
1370 s = string_cat(s, &size, &ptr, recipients_list[i].address,
1371 Ustrlen(recipients_list[i].address));
1372 }
1373 s[ptr] = 0; /* string_cat() leaves room */
1374 }
1375 return s;
1376
1377 case vtype_pspace:
1378 {
1379 int inodes;
1380 sprintf(CS var_buffer, "%d",
1381 receive_statvfs((BOOL)(var_table[middle].value), &inodes));
1382 }
1383 return var_buffer;
1384
1385 case vtype_pinodes:
1386 {
1387 int inodes;
1388 (void) receive_statvfs((BOOL)(var_table[middle].value), &inodes);
1389 sprintf(CS var_buffer, "%d", inodes);
1390 }
1391 return var_buffer;
1392 }
1393 }
1394
1395 return NULL; /* Unknown variable name */
1396 }
1397
1398
1399
1400
1401 /*************************************************
1402 * Read and expand substrings *
1403 *************************************************/
1404
1405 /* This function is called to read and expand argument substrings for various
1406 expansion items. Some have a minimum requirement that is less than the maximum;
1407 in these cases, the first non-present one is set to NULL.
1408
1409 Arguments:
1410 sub points to vector of pointers to set
1411 n maximum number of substrings
1412 m minimum required
1413 sptr points to current string pointer
1414 skipping the skipping flag
1415 check_end if TRUE, check for final '}'
1416 name name of item, for error message
1417
1418 Returns: 0 OK; string pointer updated
1419 1 curly bracketing error (too few arguments)
1420 2 too many arguments (only if check_end is set); message set
1421 3 other error (expansion failure)
1422 */
1423
1424 static int
1425 read_subs(uschar **sub, int n, int m, uschar **sptr, BOOL skipping,
1426 BOOL check_end, uschar *name)
1427 {
1428 int i;
1429 uschar *s = *sptr;
1430
1431 while (isspace(*s)) s++;
1432 for (i = 0; i < n; i++)
1433 {
1434 if (*s != '{')
1435 {
1436 if (i < m) return 1;
1437 sub[i] = NULL;
1438 break;
1439 }
1440 sub[i] = expand_string_internal(s+1, TRUE, &s, skipping);
1441 if (sub[i] == NULL) return 3;
1442 if (*s++ != '}') return 1;
1443 while (isspace(*s)) s++;
1444 }
1445 if (check_end && *s++ != '}')
1446 {
1447 if (s[-1] == '{')
1448 {
1449 expand_string_message = string_sprintf("Too many arguments for \"%s\" "
1450 "(max is %d)", name, n);
1451 return 2;
1452 }
1453 return 1;
1454 }
1455
1456 *sptr = s;
1457 return 0;
1458 }
1459
1460
1461
1462
1463 /*************************************************
1464 * Read and evaluate a condition *
1465 *************************************************/
1466
1467 /*
1468 Arguments:
1469 s points to the start of the condition text
1470 yield points to a BOOL to hold the result of the condition test;
1471 if NULL, we are just reading through a condition that is
1472 part of an "or" combination to check syntax, or in a state
1473 where the answer isn't required
1474
1475 Returns: a pointer to the first character after the condition, or
1476 NULL after an error
1477 */
1478
1479 static uschar *
1480 eval_condition(uschar *s, BOOL *yield)
1481 {
1482 BOOL testfor = TRUE;
1483 BOOL tempcond, combined_cond;
1484 BOOL *subcondptr;
1485 int i, rc, cond_type, roffset;
1486 int num[2];
1487 struct stat statbuf;
1488 uschar name[256];
1489 uschar *sub[4];
1490
1491 const pcre *re;
1492 const uschar *rerror;
1493
1494 for (;;)
1495 {
1496 while (isspace(*s)) s++;
1497 if (*s == '!') { testfor = !testfor; s++; } else break;
1498 }
1499
1500 /* Numeric comparisons are symbolic */
1501
1502 if (*s == '=' || *s == '>' || *s == '<')
1503 {
1504 int p = 0;
1505 name[p++] = *s++;
1506 if (*s == '=')
1507 {
1508 name[p++] = '=';
1509 s++;
1510 }
1511 name[p] = 0;
1512 }
1513
1514 /* All other conditions are named */
1515
1516 else s = read_name(name, 256, s, US"_");
1517
1518 /* If we haven't read a name, it means some non-alpha character is first. */
1519
1520 if (name[0] == 0)
1521 {
1522 expand_string_message = string_sprintf("condition name expected, "
1523 "but found \"%.16s\"", s);
1524 return NULL;
1525 }
1526
1527 /* Find which condition we are dealing with, and switch on it */
1528
1529 cond_type = chop_match(name, cond_table, sizeof(cond_table)/sizeof(uschar *));
1530 switch(cond_type)
1531 {
1532 /* def: tests for a non-zero or non-NULL variable, or for an existing
1533 header */
1534
1535 case ECOND_DEF:
1536 if (*s != ':')
1537 {
1538 expand_string_message = US"\":\" expected after \"def\"";
1539 return NULL;
1540 }
1541
1542 s = read_name(name, 256, s+1, US"_");
1543
1544 /* Test for a header's existence */
1545
1546 if (Ustrncmp(name, "h_", 2) == 0 ||
1547 Ustrncmp(name, "rh_", 3) == 0 ||
1548 Ustrncmp(name, "bh_", 3) == 0 ||
1549 Ustrncmp(name, "header_", 7) == 0 ||
1550 Ustrncmp(name, "rheader_", 8) == 0 ||
1551 Ustrncmp(name, "bheader_", 8) == 0)
1552 {
1553 s = read_header_name(name, 256, s);
1554 if (yield != NULL) *yield =
1555 (find_header(name, TRUE, NULL, FALSE, NULL) != NULL) == testfor;
1556 }
1557
1558 /* Test for a variable's having a non-empty value. If yield == NULL we
1559 are in a skipping state, and don't care about the answer. */
1560
1561 else
1562 {
1563 uschar *value = find_variable(name, TRUE, yield == NULL, NULL);
1564 if (value == NULL)
1565 {
1566 expand_string_message = (name[0] == 0)?
1567 string_sprintf("variable name omitted after \"def:\"") :
1568 string_sprintf("unknown variable \"%s\" after \"def:\"", name);
1569 return NULL;
1570 }
1571 if (yield != NULL)
1572 *yield = (value[0] != 0 && Ustrcmp(value, "0") != 0) == testfor;
1573 }
1574
1575 return s;
1576
1577
1578 /* first_delivery tests for first delivery attempt */
1579
1580 case ECOND_FIRST_DELIVERY:
1581 if (yield != NULL) *yield = deliver_firsttime == testfor;
1582 return s;
1583
1584
1585 /* queue_running tests for any process started by a queue runner */
1586
1587 case ECOND_QUEUE_RUNNING:
1588 if (yield != NULL) *yield = (queue_run_pid != (pid_t)0) == testfor;
1589 return s;
1590
1591
1592 /* exists: tests for file existence
1593 isip: tests for any IP address
1594 isip4: tests for an IPv4 address
1595 isip6: tests for an IPv6 address
1596 pam: does PAM authentication
1597 radius: does RADIUS authentication
1598 ldapauth: does LDAP authentication
1599 pwcheck: does Cyrus SASL pwcheck authentication
1600 */
1601
1602 case ECOND_EXISTS:
1603 case ECOND_ISIP:
1604 case ECOND_ISIP4:
1605 case ECOND_ISIP6:
1606 case ECOND_PAM:
1607 case ECOND_RADIUS:
1608 case ECOND_LDAPAUTH:
1609 case ECOND_PWCHECK:
1610
1611 while (isspace(*s)) s++;
1612 if (*s != '{') goto COND_FAILED_CURLY_START;
1613
1614 sub[0] = expand_string_internal(s+1, TRUE, &s, yield == NULL);
1615 if (sub[0] == NULL) return NULL;
1616 if (*s++ != '}') goto COND_FAILED_CURLY_END;
1617
1618 if (yield == NULL) return s; /* No need to run the test if skipping */
1619
1620 switch(cond_type)
1621 {
1622 case ECOND_EXISTS:
1623 if ((expand_forbid & RDO_EXISTS) != 0)
1624 {
1625 expand_string_message = US"File existence tests are not permitted";
1626 return NULL;
1627 }
1628 *yield = (Ustat(sub[0], &statbuf) == 0) == testfor;
1629 break;
1630
1631 case ECOND_ISIP:
1632 case ECOND_ISIP4:
1633 case ECOND_ISIP6:
1634 rc = string_is_ip_address(sub[0], NULL);
1635 *yield = ((cond_type == ECOND_ISIP)? (rc > 0) :
1636 (cond_type == ECOND_ISIP4)? (rc == 4) : (rc == 6)) == testfor;
1637 break;
1638
1639 /* Various authentication tests - all optionally compiled */
1640
1641 case ECOND_PAM:
1642 #ifdef SUPPORT_PAM
1643 rc = auth_call_pam(sub[0], &expand_string_message);
1644 goto END_AUTH;
1645 #else
1646 goto COND_FAILED_NOT_COMPILED;
1647 #endif /* SUPPORT_PAM */
1648
1649 case ECOND_RADIUS:
1650 #ifdef RADIUS_CONFIG_FILE
1651 rc = auth_call_radius(sub[0], &expand_string_message);
1652 goto END_AUTH;
1653 #else
1654 goto COND_FAILED_NOT_COMPILED;
1655 #endif /* RADIUS_CONFIG_FILE */
1656
1657 case ECOND_LDAPAUTH:
1658 #ifdef LOOKUP_LDAP
1659 {
1660 /* Just to keep the interface the same */
1661 BOOL do_cache;
1662 int old_pool = store_pool;
1663 store_pool = POOL_SEARCH;
1664 rc = eldapauth_find((void *)(-1), NULL, sub[0], Ustrlen(sub[0]), NULL,
1665 &expand_string_message, &do_cache);
1666 store_pool = old_pool;
1667 }
1668 goto END_AUTH;
1669 #else
1670 goto COND_FAILED_NOT_COMPILED;
1671 #endif /* LOOKUP_LDAP */
1672
1673 case ECOND_PWCHECK:
1674 #ifdef CYRUS_PWCHECK_SOCKET
1675 rc = auth_call_pwcheck(sub[0], &expand_string_message);
1676 goto END_AUTH;
1677 #else
1678 goto COND_FAILED_NOT_COMPILED;
1679 #endif /* CYRUS_PWCHECK_SOCKET */
1680
1681 #if defined(SUPPORT_PAM) || defined(RADIUS_CONFIG_FILE) || \
1682 defined(LOOKUP_LDAP) || defined(CYRUS_PWCHECK_SOCKET)
1683 END_AUTH:
1684 if (rc == ERROR || rc == DEFER) return NULL;
1685 *yield = (rc == OK) == testfor;
1686 #endif
1687 }
1688 return s;
1689
1690
1691 /* saslauthd: does Cyrus saslauthd authentication. Four parameters are used:
1692
1693 ${if saslauthd {{username}{password}{service}{realm}} {yes}[no}}
1694
1695 However, the last two are optional. That is why the whole set is enclosed
1696 in their own set or braces. */
1697
1698 case ECOND_SASLAUTHD:
1699 #ifndef CYRUS_SASLAUTHD_SOCKET
1700 goto COND_FAILED_NOT_COMPILED;
1701 #else
1702 while (isspace(*s)) s++;
1703 if (*s++ != '{') goto COND_FAILED_CURLY_START;
1704 switch(read_subs(sub, 4, 2, &s, yield == NULL, TRUE, US"saslauthd"))
1705 {
1706 case 1: expand_string_message = US"too few arguments or bracketing "
1707 "error for saslauthd";
1708 case 2:
1709 case 3: return NULL;
1710 }
1711 if (sub[2] == NULL) sub[3] = NULL; /* realm if no service */
1712 if (yield != NULL)
1713 {
1714 int rc;
1715 rc = auth_call_saslauthd(sub[0], sub[1], sub[2], sub[3],
1716 &expand_string_message);
1717 if (rc == ERROR || rc == DEFER) return NULL;
1718 *yield = (rc == OK) == testfor;
1719 }
1720 return s;
1721 #endif /* CYRUS_SASLAUTHD_SOCKET */
1722
1723
1724 /* symbolic operators for numeric and string comparison, and a number of
1725 other operators, all requiring two arguments.
1726
1727 match: does a regular expression match and sets up the numerical
1728 variables if it succeeds
1729 match_address: matches in an address list
1730 match_domain: matches in a domain list
1731 match_local_part: matches in a local part list
1732 crypteq: encrypts plaintext and compares against an encrypted text,
1733 using crypt(), crypt16(), MD5 or SHA-1
1734 */
1735
1736 case ECOND_MATCH:
1737 case ECOND_MATCH_ADDRESS:
1738 case ECOND_MATCH_DOMAIN:
1739 case ECOND_MATCH_LOCAL_PART:
1740 case ECOND_CRYPTEQ:
1741
1742 case ECOND_NUM_L: /* Numerical comparisons */
1743 case ECOND_NUM_LE:
1744 case ECOND_NUM_E:
1745 case ECOND_NUM_EE:
1746 case ECOND_NUM_G:
1747 case ECOND_NUM_GE:
1748
1749 case ECOND_STR_LT: /* String comparisons */
1750 case ECOND_STR_LTI:
1751 case ECOND_STR_LE:
1752 case ECOND_STR_LEI:
1753 case ECOND_STR_EQ:
1754 case ECOND_STR_EQI:
1755 case ECOND_STR_GT:
1756 case ECOND_STR_GTI:
1757 case ECOND_STR_GE:
1758 case ECOND_STR_GEI:
1759
1760 for (i = 0; i < 2; i++)
1761 {
1762 while (isspace(*s)) s++;
1763 if (*s != '{')
1764 {
1765 if (i == 0) goto COND_FAILED_CURLY_START;
1766 expand_string_message = string_sprintf("missing 2nd string in {} "
1767 "after \"%s\"", name);
1768 return NULL;
1769 }
1770 sub[i] = expand_string_internal(s+1, TRUE, &s, yield == NULL);
1771 if (sub[i] == NULL) return NULL;
1772 if (*s++ != '}') goto COND_FAILED_CURLY_END;
1773
1774 /* Convert to numerical if required; we know that the names of all the
1775 conditions that compare numbers do not start with a letter. This just saves
1776 checking for them individually. */
1777
1778 if (!isalpha(name[0]))
1779 {
1780 uschar *endptr;
1781 num[i] = (int)Ustrtol((const uschar *)sub[i], &endptr, 10);
1782 if (tolower(*endptr) == 'k')
1783 {
1784 num[i] *= 1024;
1785 endptr++;
1786 }
1787 else if (tolower(*endptr) == 'm')
1788 {
1789 num[i] *= 1024*1024;
1790 endptr++;
1791 }
1792 while (isspace(*endptr)) endptr++;
1793 if (*endptr != 0)
1794 {
1795 expand_string_message = string_sprintf("\"%s\" is not a number",
1796 sub[i]);
1797 return NULL;
1798 }
1799 }
1800 }
1801
1802 /* Result not required */
1803
1804 if (yield == NULL) return s;
1805
1806 /* Do an appropriate comparison */
1807
1808 switch(cond_type)
1809 {
1810 case ECOND_NUM_E:
1811 case ECOND_NUM_EE:
1812 *yield = (num[0] == num[1]) == testfor;
1813 break;
1814
1815 case ECOND_NUM_G:
1816 *yield = (num[0] > num[1]) == testfor;
1817 break;
1818
1819 case ECOND_NUM_GE:
1820 *yield = (num[0] >= num[1]) == testfor;
1821 break;
1822
1823 case ECOND_NUM_L:
1824 *yield = (num[0] < num[1]) == testfor;
1825 break;
1826
1827 case ECOND_NUM_LE:
1828 *yield = (num[0] <= num[1]) == testfor;
1829 break;
1830
1831 case ECOND_STR_LT:
1832 *yield = (Ustrcmp(sub[0], sub[1]) < 0) == testfor;
1833 break;
1834
1835 case ECOND_STR_LTI:
1836 *yield = (strcmpic(sub[0], sub[1]) < 0) == testfor;
1837 break;
1838
1839 case ECOND_STR_LE:
1840 *yield = (Ustrcmp(sub[0], sub[1]) <= 0) == testfor;
1841 break;
1842
1843 case ECOND_STR_LEI:
1844 *yield = (strcmpic(sub[0], sub[1]) <= 0) == testfor;
1845 break;
1846
1847 case ECOND_STR_EQ:
1848 *yield = (Ustrcmp(sub[0], sub[1]) == 0) == testfor;
1849 break;
1850
1851 case ECOND_STR_EQI:
1852 *yield = (strcmpic(sub[0], sub[1]) == 0) == testfor;
1853 break;
1854
1855 case ECOND_STR_GT:
1856 *yield = (Ustrcmp(sub[0], sub[1]) > 0) == testfor;
1857 break;
1858
1859 case ECOND_STR_GTI:
1860 *yield = (strcmpic(sub[0], sub[1]) > 0) == testfor;
1861 break;
1862
1863 case ECOND_STR_GE:
1864 *yield = (Ustrcmp(sub[0], sub[1]) >= 0) == testfor;
1865 break;
1866
1867 case ECOND_STR_GEI:
1868 *yield = (strcmpic(sub[0], sub[1]) >= 0) == testfor;
1869 break;
1870
1871 case ECOND_MATCH: /* Regular expression match */
1872 re = pcre_compile(CS sub[1], PCRE_COPT, (const char **)&rerror, &roffset,
1873 NULL);
1874 if (re == NULL)
1875 {
1876 expand_string_message = string_sprintf("regular expression error in "
1877 "\"%s\": %s at offset %d", sub[1], rerror, roffset);
1878 return NULL;
1879 }
1880 *yield = regex_match_and_setup(re, sub[0], 0, -1) == testfor;
1881 break;
1882
1883 case ECOND_MATCH_ADDRESS: /* Match in an address list */
1884 rc = match_address_list(sub[0], TRUE, FALSE, &(sub[1]), NULL, -1, 0, NULL);
1885 goto MATCHED_SOMETHING;
1886
1887 case ECOND_MATCH_DOMAIN: /* Match in a domain list */
1888 rc = match_isinlist(sub[0], &(sub[1]), 0, &domainlist_anchor, NULL,
1889 MCL_DOMAIN + MCL_NOEXPAND, TRUE, NULL);
1890 goto MATCHED_SOMETHING;
1891
1892 case ECOND_MATCH_LOCAL_PART:
1893 rc = match_isinlist(sub[0], &(sub[1]), 0, &localpartlist_anchor, NULL,
1894 MCL_LOCALPART + MCL_NOEXPAND, TRUE, NULL);
1895 /* Fall through */
1896
1897 MATCHED_SOMETHING:
1898 switch(rc)
1899 {
1900 case OK:
1901 *yield = testfor;
1902 break;
1903
1904 case FAIL:
1905 *yield = !testfor;
1906 break;
1907
1908 case DEFER:
1909 expand_string_message = string_sprintf("unable to complete match "
1910 "against \"%s\": %s", sub[1], search_error_message);
1911 return NULL;
1912 }
1913
1914 break;
1915
1916 /* Various "encrypted" comparisons. If the second string starts with
1917 "{" then an encryption type is given. Default to crypt() or crypt16()
1918 (build-time choice). */
1919
1920 case ECOND_CRYPTEQ:
1921 #ifndef SUPPORT_CRYPTEQ
1922 goto COND_FAILED_NOT_COMPILED;
1923 #else
1924 if (strncmpic(sub[1], US"{md5}", 5) == 0)
1925 {
1926 int sublen = Ustrlen(sub[1]+5);
1927 md5 base;
1928 uschar digest[16];
1929
1930 md5_start(&base);
1931 md5_end(&base, (uschar *)sub[0], Ustrlen(sub[0]), digest);
1932
1933 /* If the length that we are comparing against is 24, the MD5 digest
1934 is expressed as a base64 string. This is the way LDAP does it. However,
1935 some other software uses a straightforward hex representation. We assume
1936 this if the length is 32. Other lengths fail. */
1937
1938 if (sublen == 24)
1939 {
1940 uschar *coded = auth_b64encode((uschar *)digest, 16);
1941 DEBUG(D_auth) debug_printf("crypteq: using MD5+B64 hashing\n"
1942 " subject=%s\n crypted=%s\n", coded, sub[1]+5);
1943 *yield = (Ustrcmp(coded, sub[1]+5) == 0) == testfor;
1944 }
1945 else if (sublen == 32)
1946 {
1947 int i;
1948 uschar coded[36];
1949 for (i = 0; i < 16; i++) sprintf(CS (coded+2*i), "%02X", digest[i]);
1950 coded[32] = 0;
1951 DEBUG(D_auth) debug_printf("crypteq: using MD5+hex hashing\n"
1952 " subject=%s\n crypted=%s\n", coded, sub[1]+5);
1953 *yield = (strcmpic(coded, sub[1]+5) == 0) == testfor;
1954 }
1955 else
1956 {
1957 DEBUG(D_auth) debug_printf("crypteq: length for MD5 not 24 or 32: "
1958 "fail\n crypted=%s\n", sub[1]+5);
1959 *yield = !testfor;
1960 }
1961 }
1962
1963 else if (strncmpic(sub[1], US"{sha1}", 6) == 0)
1964 {
1965 int sublen = Ustrlen(sub[1]+6);
1966 sha1 base;
1967 uschar digest[20];
1968
1969 sha1_start(&base);
1970 sha1_end(&base, (uschar *)sub[0], Ustrlen(sub[0]), digest);
1971
1972 /* If the length that we are comparing against is 28, assume the SHA1
1973 digest is expressed as a base64 string. If the length is 40, assume a
1974 straightforward hex representation. Other lengths fail. */
1975
1976 if (sublen == 28)
1977 {
1978 uschar *coded = auth_b64encode((uschar *)digest, 20);
1979 DEBUG(D_auth) debug_printf("crypteq: using SHA1+B64 hashing\n"
1980 " subject=%s\n crypted=%s\n", coded, sub[1]+6);
1981 *yield = (Ustrcmp(coded, sub[1]+6) == 0) == testfor;
1982 }
1983 else if (sublen == 40)
1984 {
1985 int i;
1986 uschar coded[44];
1987 for (i = 0; i < 20; i++) sprintf(CS (coded+2*i), "%02X", digest[i]);
1988 coded[40] = 0;
1989 DEBUG(D_auth) debug_printf("crypteq: using SHA1+hex hashing\n"
1990 " subject=%s\n crypted=%s\n", coded, sub[1]+6);
1991 *yield = (strcmpic(coded, sub[1]+6) == 0) == testfor;
1992 }
1993 else
1994 {
1995 DEBUG(D_auth) debug_printf("crypteq: length for SHA-1 not 28 or 40: "
1996 "fail\n crypted=%s\n", sub[1]+6);
1997 *yield = !testfor;
1998 }
1999 }
2000
2001 else /* {crypt} or {crypt16} and non-{ at start */
2002 {
2003 int which = 0;
2004 uschar *coded;
2005
2006 if (strncmpic(sub[1], US"{crypt}", 7) == 0)
2007 {
2008 sub[1] += 7;
2009 which = 1;
2010 }
2011 else if (strncmpic(sub[1], US"{crypt16}", 9) == 0)
2012 {
2013 sub[1] += 9;
2014 which = 2;
2015 }
2016 else if (sub[1][0] == '{')
2017 {
2018 expand_string_message = string_sprintf("unknown encryption mechanism "
2019 "in \"%s\"", sub[1]);
2020 return NULL;
2021 }
2022
2023 switch(which)
2024 {
2025 case 0: coded = US DEFAULT_CRYPT(CS sub[0], CS sub[1]); break;
2026 case 1: coded = US crypt(CS sub[0], CS sub[1]); break;
2027 default: coded = US crypt16(CS sub[0], CS sub[1]); break;
2028 }
2029
2030 #define STR(s) # s
2031 #define XSTR(s) STR(s)
2032 DEBUG(D_auth) debug_printf("crypteq: using %s()\n"
2033 " subject=%s\n crypted=%s\n",
2034 (which == 0)? XSTR(DEFAULT_CRYPT) : (which == 1)? "crypt" : "crypt16",
2035 coded, sub[1]);
2036 #undef STR
2037 #undef XSTR
2038
2039 /* If the encrypted string contains fewer than two characters (for the
2040 salt), force failure. Otherwise we get false positives: with an empty
2041 string the yield of crypt() is an empty string! */
2042
2043 *yield = (Ustrlen(sub[1]) < 2)? !testfor :
2044 (Ustrcmp(coded, sub[1]) == 0) == testfor;
2045 }
2046 break;
2047 #endif /* SUPPORT_CRYPTEQ */
2048 } /* Switch for comparison conditions */
2049
2050 return s; /* End of comparison conditions */
2051
2052
2053 /* and/or: computes logical and/or of several conditions */
2054
2055 case ECOND_AND:
2056 case ECOND_OR:
2057 subcondptr = (yield == NULL)? NULL : &tempcond;
2058 combined_cond = (cond_type == ECOND_AND);
2059
2060 while (isspace(*s)) s++;
2061 if (*s++ != '{') goto COND_FAILED_CURLY_START;
2062
2063 for (;;)
2064 {
2065 while (isspace(*s)) s++;
2066 if (*s == '}') break;
2067 if (*s != '{')
2068 {
2069 expand_string_message = string_sprintf("each subcondition "
2070 "inside an \"%s{...}\" condition must be in its own {}", name);
2071 return NULL;
2072 }
2073
2074 s = eval_condition(s+1, subcondptr);
2075 if (s == NULL)
2076 {
2077 expand_string_message = string_sprintf("%s inside \"%s{...}\" condition",
2078 expand_string_message, name);
2079 return NULL;
2080 }
2081 while (isspace(*s)) s++;
2082
2083 if (*s++ != '}')
2084 {
2085 expand_string_message = string_sprintf("missing } at end of condition "
2086 "inside \"%s\" group", name);
2087 return NULL;
2088 }
2089
2090 if (yield != NULL)
2091 {
2092 if (cond_type == ECOND_AND)
2093 {
2094 combined_cond &= tempcond;
2095 if (!combined_cond) subcondptr = NULL; /* once false, don't */
2096 } /* evaluate any more */
2097 else
2098 {
2099 combined_cond |= tempcond;
2100 if (combined_cond) subcondptr = NULL; /* once true, don't */
2101 } /* evaluate any more */
2102 }
2103 }
2104
2105 if (yield != NULL) *yield = (combined_cond == testfor);
2106 return ++s;
2107
2108
2109 /* Unknown condition */
2110
2111 default:
2112 expand_string_message = string_sprintf("unknown condition \"%s\"", name);
2113 return NULL;
2114 } /* End switch on condition type */
2115
2116 /* Missing braces at start and end of data */
2117
2118 COND_FAILED_CURLY_START:
2119 expand_string_message = string_sprintf("missing { after \"%s\"", name);
2120 return NULL;
2121
2122 COND_FAILED_CURLY_END:
2123 expand_string_message = string_sprintf("missing } at end of \"%s\" condition",
2124 name);
2125 return NULL;
2126
2127 /* A condition requires code that is not compiled */
2128
2129 #if !defined(SUPPORT_PAM) || !defined(RADIUS_CONFIG_FILE) || \
2130 !defined(LOOKUP_LDAP) || !defined(CYRUS_PWCHECK_SOCKET) || \
2131 !defined(SUPPORT_CRYPTEQ) || !defined(CYRUS_SASLAUTHD_SOCKET)
2132 COND_FAILED_NOT_COMPILED:
2133 expand_string_message = string_sprintf("support for \"%s\" not compiled",
2134 name);
2135 return NULL;
2136 #endif
2137 }
2138
2139
2140
2141
2142 /*************************************************
2143 * Save numerical variables *
2144 *************************************************/
2145
2146 /* This function is called from items such as "if" that want to preserve and
2147 restore the numbered variables.
2148
2149 Arguments:
2150 save_expand_string points to an array of pointers to set
2151 save_expand_nlength points to an array of ints for the lengths
2152
2153 Returns: the value of expand max to save
2154 */
2155
2156 static int
2157 save_expand_strings(uschar **save_expand_nstring, int *save_expand_nlength)
2158 {
2159 int i;
2160 for (i = 0; i <= expand_nmax; i++)
2161 {
2162 save_expand_nstring[i] = expand_nstring[i];
2163 save_expand_nlength[i] = expand_nlength[i];
2164 }
2165 return expand_nmax;
2166 }
2167
2168
2169
2170 /*************************************************
2171 * Restore numerical variables *
2172 *************************************************/
2173
2174 /* This function restored saved values of numerical strings.
2175
2176 Arguments:
2177 save_expand_nmax the number of strings to restore
2178 save_expand_string points to an array of pointers
2179 save_expand_nlength points to an array of ints
2180
2181 Returns: nothing
2182 */
2183
2184 static void
2185 restore_expand_strings(int save_expand_nmax, uschar **save_expand_nstring,
2186 int *save_expand_nlength)
2187 {
2188 int i;
2189 expand_nmax = save_expand_nmax;
2190 for (i = 0; i <= expand_nmax; i++)
2191 {
2192 expand_nstring[i] = save_expand_nstring[i];
2193 expand_nlength[i] = save_expand_nlength[i];
2194 }
2195 }
2196
2197
2198
2199
2200
2201 /*************************************************
2202 * Handle yes/no substrings *
2203 *************************************************/
2204
2205 /* This function is used by ${if}, ${lookup} and ${extract} to handle the
2206 alternative substrings that depend on whether or not the condition was true,
2207 or the lookup or extraction succeeded. The substrings always have to be
2208 expanded, to check their syntax, but "skipping" is set when the result is not
2209 needed - this avoids unnecessary nested lookups.
2210
2211 Arguments:
2212 skipping TRUE if we were skipping when this item was reached
2213 yes TRUE if the first string is to be used, else use the second
2214 save_lookup a value to put back into lookup_value before the 2nd expansion
2215 sptr points to the input string pointer
2216 yieldptr points to the output string pointer
2217 sizeptr points to the output string size
2218 ptrptr points to the output string pointer
2219 type "lookup" or "if" or "extract" or "run", for error message
2220
2221 Returns: 0 OK; lookup_value has been reset to save_lookup
2222 1 expansion failed
2223 2 expansion failed because of bracketing error
2224 */
2225
2226 static int
2227 process_yesno(BOOL skipping, BOOL yes, uschar *save_lookup, uschar **sptr,
2228 uschar **yieldptr, int *sizeptr, int *ptrptr, uschar *type)
2229 {
2230 int rc = 0;
2231 uschar *s = *sptr; /* Local value */
2232 uschar *sub1, *sub2;
2233
2234 /* If there are no following strings, we substitute the contents of $value for
2235 lookups and for extractions in the success case. For the ${if item, the string
2236 "true" is substituted. In the fail case, nothing is substituted for all three
2237 items. */
2238
2239 while (isspace(*s)) s++;
2240 if (*s == '}')
2241 {
2242 if (type[0] == 'i')
2243 {
2244 if (yes) *yieldptr = string_cat(*yieldptr, sizeptr, ptrptr, US"true", 4);
2245 }
2246 else
2247 {
2248 if (yes && lookup_value != NULL)
2249 *yieldptr = string_cat(*yieldptr, sizeptr, ptrptr, lookup_value,
2250 Ustrlen(lookup_value));
2251 lookup_value = save_lookup;
2252 }
2253 s++;
2254 goto RETURN;
2255 }
2256
2257 /* Expand the first substring. Forced failures are noticed only if we actually
2258 want this string. Set skipping in the call in the fail case (this will always
2259 be the case if we were already skipping). */
2260
2261 sub1 = expand_string_internal(s+1, TRUE, &s, !yes);
2262 if (sub1 == NULL && (yes || !expand_string_forcedfail)) goto FAILED;
2263 expand_string_forcedfail = FALSE;
2264 if (*s++ != '}') goto FAILED_CURLY;
2265
2266 /* If we want the first string, add it to the output */
2267
2268 if (yes)
2269 *yieldptr = string_cat(*yieldptr, sizeptr, ptrptr, sub1, Ustrlen(sub1));
2270
2271 /* If this is called from a lookup or an extract, we want to restore $value to
2272 what it was at the start of the item, so that it has this value during the
2273 second string expansion. For the call from "if" to this function, save_lookup
2274 is set to lookup_value, so that this statement does nothing. */
2275
2276 lookup_value = save_lookup;
2277
2278 /* There now follows either another substring, or "fail", or nothing. This
2279 time, forced failures are noticed only if we want the second string. We must
2280 set skipping in the nested call if we don't want this string, or if we were
2281 already skipping. */
2282
2283 while (isspace(*s)) s++;
2284 if (*s == '{')
2285 {
2286 sub2 = expand_string_internal(s+1, TRUE, &s, yes || skipping);
2287 if (sub2 == NULL && (!yes || !expand_string_forcedfail)) goto FAILED;
2288 expand_string_forcedfail = FALSE;
2289 if (*s++ != '}') goto FAILED_CURLY;
2290
2291 /* If we want the second string, add it to the output */
2292
2293 if (!yes)
2294 *yieldptr = string_cat(*yieldptr, sizeptr, ptrptr, sub2, Ustrlen(sub2));
2295 }
2296
2297 /* If there is no second string, but the word "fail" is present when the use of
2298 the second string is wanted, set a flag indicating it was a forced failure
2299 rather than a syntactic error. Swallow the terminating } in case this is nested
2300 inside another lookup or if or extract. */
2301
2302 else if (*s != '}')
2303 {
2304 uschar name[256];
2305 s = read_name(name, sizeof(name), s, US"_");
2306 if (Ustrcmp(name, "fail") == 0)
2307 {
2308 if (!yes && !skipping)
2309 {
2310 while (isspace(*s)) s++;
2311 if (*s++ != '}') goto FAILED_CURLY;
2312 expand_string_message =
2313 string_sprintf("\"%s\" failed and \"fail\" requested", type);
2314 expand_string_forcedfail = TRUE;
2315 goto FAILED;
2316 }
2317 }
2318 else
2319 {
2320 expand_string_message =
2321 string_sprintf("syntax error in \"%s\" item - \"fail\" expected", type);
2322 goto FAILED;
2323 }
2324 }
2325
2326 /* All we have to do now is to check on the final closing brace. */
2327
2328 while (isspace(*s)) s++;
2329 if (*s++ == '}') goto RETURN;
2330
2331 /* Get here if there is a bracketing failure */
2332
2333 FAILED_CURLY:
2334 rc++;
2335
2336 /* Get here for other failures */
2337
2338 FAILED:
2339 rc++;
2340
2341 /* Update the input pointer value before returning */
2342
2343 RETURN:
2344 *sptr = s;
2345 return rc;
2346 }
2347
2348
2349
2350
2351
2352
2353 /*************************************************
2354 * Handle MD5 or SHA-1 computation for HMAC *
2355 *************************************************/
2356
2357 /* These are some wrapping functions that enable the HMAC code to be a bit
2358 cleaner. A good compiler will spot the tail recursion.
2359
2360 Arguments:
2361 type HMAC_MD5 or HMAC_SHA1
2362 remaining are as for the cryptographic hash functions
2363
2364 Returns: nothing
2365 */
2366
2367 static void
2368 chash_start(int type, void *base)
2369 {
2370 if (type == HMAC_MD5)
2371 md5_start((md5 *)base);
2372 else
2373 sha1_start((sha1 *)base);
2374 }
2375
2376 static void
2377 chash_mid(int type, void *base, uschar *string)
2378 {
2379 if (type == HMAC_MD5)
2380 md5_mid((md5 *)base, string);
2381 else
2382 sha1_mid((sha1 *)base, string);
2383 }
2384
2385 static void
2386 chash_end(int type, void *base, uschar *string, int length, uschar *digest)
2387 {
2388 if (type == HMAC_MD5)
2389 md5_end((md5 *)base, string, length, digest);
2390 else
2391 sha1_end((sha1 *)base, string, length, digest);
2392 }
2393
2394
2395
2396
2397
2398 /*************************************************
2399 * Join a file onto the output string *
2400 *************************************************/
2401
2402 /* This is used for readfile and after a run expansion. It joins the contents
2403 of a file onto the output string, globally replacing newlines with a given
2404 string (optionally). The file is closed at the end.
2405
2406 Arguments:
2407 f the FILE
2408 yield pointer to the expandable string
2409 sizep pointer to the current size
2410 ptrp pointer to the current position
2411 eol newline replacement string, or NULL
2412
2413 Returns: new value of string pointer
2414 */
2415
2416 static uschar *
2417 cat_file(FILE *f, uschar *yield, int *sizep, int *ptrp, uschar *eol)
2418 {
2419 int eollen;
2420 uschar buffer[1024];
2421
2422 eollen = (eol == NULL)? 0 : Ustrlen(eol);
2423
2424 while (Ufgets(buffer, sizeof(buffer), f) != NULL)
2425 {
2426 int len = Ustrlen(buffer);
2427 if (eol != NULL && buffer[len-1] == '\n') len--;
2428 yield = string_cat(yield, sizep, ptrp, buffer, len);
2429 if (buffer[len] != 0)
2430 yield = string_cat(yield, sizep, ptrp, eol, eollen);
2431 }
2432
2433 if (yield != NULL) yield[*ptrp] = 0;
2434
2435 return yield;
2436 }
2437
2438
2439
2440
2441 /*************************************************
2442 * Evaluate numeric expression *
2443 *************************************************/
2444
2445 /* This is a set of mutually recursive functions that evaluate a simple
2446 arithmetic expression involving only + - * / and parentheses. The only one that
2447 is called from elsewhere is eval_expr, whose interface is:
2448
2449 Arguments:
2450 sptr pointer to the pointer to the string - gets updated
2451 decimal TRUE if numbers are to be assumed decimal
2452 error pointer to where to put an error message - must be NULL on input
2453 endket TRUE if ')' must terminate - FALSE for external call
2454
2455
2456 Returns: on success: the value of the expression, with *error still NULL
2457 on failure: an undefined value, with *error = a message
2458 */
2459
2460 static int eval_sumterm(uschar **, BOOL, uschar **);
2461
2462 static int
2463 eval_expr(uschar **sptr, BOOL decimal, uschar **error, BOOL endket)
2464 {
2465 uschar *s = *sptr;
2466 int x = eval_sumterm(&s, decimal, error);
2467 if (*error == NULL)
2468 {
2469 while (*s == '+' || *s == '-')
2470 {
2471 int op = *s++;
2472 int y = eval_sumterm(&s, decimal, error);
2473 if (*error != NULL) break;
2474 if (op == '+') x += y; else x -= y;
2475 }
2476 if (*error == NULL)
2477 {
2478 if (endket)
2479 {
2480 if (*s != ')')
2481 *error = US"expecting closing parenthesis";
2482 else
2483 while (isspace(*(++s)));
2484 }
2485 else if (*s != 0) *error = US"expecting + or -";
2486 }
2487 }
2488
2489 *sptr = s;
2490 return x;
2491 }
2492
2493 static int
2494 eval_term(uschar **sptr, BOOL decimal, uschar **error)
2495 {
2496 register int c;
2497 int n;
2498 uschar *s = *sptr;
2499 while (isspace(*s)) s++;
2500 c = *s;
2501 if (isdigit(c) || ((c == '-' || c == '+') && isdigit(s[1])))
2502 {
2503 int count;
2504 (void)sscanf(CS s, (decimal? "%d%n" : "%i%n"), &n, &count);
2505 s += count;
2506 if (tolower(*s) == 'k') { n *= 1024; s++; }
2507 else if (tolower(*s) == 'm') { n *= 1024*1024; s++; }
2508 while (isspace (*s)) s++;
2509 }
2510 else if (c == '(')
2511 {
2512 s++;
2513 n = eval_expr(&s, decimal, error, 1);
2514 }
2515 else
2516 {
2517 *error = US"expecting number or opening parenthesis";
2518 n = 0;
2519 }
2520 *sptr = s;
2521 return n;
2522 }
2523
2524 static int eval_sumterm(uschar **sptr, BOOL decimal, uschar **error)
2525 {
2526 uschar *s = *sptr;
2527 int x = eval_term(&s, decimal, error);
2528 if (*error == NULL)
2529 {
2530 while (*s == '*' || *s == '/')
2531 {
2532 int op = *s++;
2533 int y = eval_term(&s, decimal, error);
2534 if (*error != NULL) break;
2535 if (op == '*') x *= y; else x /= y;
2536 }
2537 }
2538 *sptr = s;
2539 return x;
2540 }
2541
2542
2543
2544
2545 /*************************************************
2546 * Expand string *
2547 *************************************************/
2548
2549 /* Returns either an unchanged string, or the expanded string in stacking pool
2550 store. Interpreted sequences are:
2551
2552 \... normal escaping rules
2553 $name substitutes the variable
2554 ${name} ditto
2555 ${op:string} operates on the expanded string value
2556 ${item{arg1}{arg2}...} expands the args and then does the business
2557 some literal args are not enclosed in {}
2558
2559 There are now far too many operators and item types to make it worth listing
2560 them here in detail any more.
2561
2562 We use an internal routine recursively to handle embedded substrings. The
2563 external function follows. The yield is NULL if the expansion failed, and there
2564 are two cases: if something collapsed syntactically, or if "fail" was given
2565 as the action on a lookup failure. These can be distinguised by looking at the
2566 variable expand_string_forcedfail, which is TRUE in the latter case.
2567
2568 The skipping flag is set true when expanding a substring that isn't actually
2569 going to be used (after "if" or "lookup") and it prevents lookups from
2570 happening lower down.
2571
2572 Store usage: At start, a store block of the length of the input plus 64
2573 is obtained. This is expanded as necessary by string_cat(), which might have to
2574 get a new block, or might be able to expand the original. At the end of the
2575 function we can release any store above that portion of the yield block that
2576 was actually used. In many cases this will be optimal.
2577
2578 However: if the first item in the expansion is a variable name or header name,
2579 we reset the store before processing it; if the result is in fresh store, we
2580 use that without copying. This is helpful for expanding strings like
2581 $message_headers which can get very long.
2582
2583 Arguments:
2584 string the string to be expanded
2585 ket_ends true if expansion is to stop at }
2586 left if not NULL, a pointer to the first character after the
2587 expansion is placed here (typically used with ket_ends)
2588 skipping TRUE for recursive calls when the value isn't actually going
2589 to be used (to allow for optimisation)
2590
2591 Returns: NULL if expansion fails:
2592 expand_string_forcedfail is set TRUE if failure was forced
2593 expand_string_message contains a textual error message
2594 a pointer to the expanded string on success
2595 */
2596
2597 static uschar *
2598 expand_string_internal(uschar *string, BOOL ket_ends, uschar **left,
2599 BOOL skipping)
2600 {
2601 int ptr = 0;
2602 int size = Ustrlen(string)+ 64;
2603 int item_type;
2604 uschar *yield = store_get(size);
2605 uschar *s = string;
2606 uschar *save_expand_nstring[EXPAND_MAXN+1];
2607 int save_expand_nlength[EXPAND_MAXN+1];
2608
2609 expand_string_forcedfail = FALSE;
2610 expand_string_message = US"";
2611
2612 while (*s != 0)
2613 {
2614 uschar *value;
2615 uschar name[256];
2616
2617 /* \ escapes the next character, which must exist, or else
2618 the expansion fails. There's a special escape, \N, which causes
2619 copying of the subject verbatim up to the next \N. Otherwise,
2620 the escapes are the standard set. */
2621
2622 if (*s == '\\')
2623 {
2624 if (s[1] == 0)
2625 {
2626 expand_string_message = US"\\ at end of string";
2627 goto EXPAND_FAILED;
2628 }
2629
2630 if (s[1] == 'N')
2631 {
2632 uschar *t = s + 2;
2633 for (s = t; *s != 0; s++) if (*s == '\\' && s[1] == 'N') break;
2634 yield = string_cat(yield, &size, &ptr, t, s - t);
2635 if (*s != 0) s += 2;
2636 }
2637
2638 else
2639 {
2640 uschar ch[1];
2641 ch[0] = string_interpret_escape(&s);
2642 s++;
2643 yield = string_cat(yield, &size, &ptr, ch, 1);
2644 }
2645
2646 continue;
2647 }
2648
2649 /* Anything other than $ is just copied verbatim, unless we are
2650 looking for a terminating } character. */
2651
2652 if (ket_ends && *s == '}') break;
2653
2654 if (*s != '$')
2655 {
2656 yield = string_cat(yield, &size, &ptr, s++, 1);
2657 continue;
2658 }
2659
2660 /* No { after the $ - must be a plain name or a number for string
2661 match variable. There has to be a fudge for variables that are the
2662 names of header fields preceded by "$header_" because header field
2663 names can contain any printing characters except space and colon.
2664 For those that don't like typing this much, "$h_" is a synonym for
2665 "$header_". A non-existent header yields a NULL value; nothing is
2666 inserted. */
2667
2668 if (isalpha((*(++s))))
2669 {
2670 int len;
2671 int newsize = 0;
2672
2673 s = read_name(name, sizeof(name), s, US"_");
2674
2675 /* If this is the first thing to be expanded, release the pre-allocated
2676 buffer. */
2677
2678 if (ptr == 0 && yield != NULL)
2679 {
2680 store_reset(yield);
2681 yield = NULL;
2682 size = 0;
2683 }
2684
2685 /* Header */
2686
2687 if (Ustrncmp(name, "h_", 2) == 0 ||
2688 Ustrncmp(name, "rh_", 3) == 0 ||
2689 Ustrncmp(name, "bh_", 3) == 0 ||
2690 Ustrncmp(name, "header_", 7) == 0 ||
2691 Ustrncmp(name, "rheader_", 8) == 0 ||
2692 Ustrncmp(name, "bheader_", 8) == 0)
2693 {
2694 BOOL want_raw = (name[0] == 'r')? TRUE : FALSE;
2695 uschar *charset = (name[0] == 'b')? NULL : headers_charset;
2696 s = read_header_name(name, sizeof(name), s);
2697 value = find_header(name, FALSE, &newsize, want_raw, charset);
2698
2699 /* If we didn't find the header, and the header contains a closing brace
2700 characters, this may be a user error where the terminating colon
2701 has been omitted. Set a flag to adjust the error message in this case.
2702 But there is no error here - nothing gets inserted. */
2703
2704 if (value == NULL)
2705 {
2706 if (Ustrchr(name, '}') != NULL) malformed_header = TRUE;
2707 continue;
2708 }
2709 }
2710
2711 /* Variable */
2712
2713 else
2714 {
2715 value = find_variable(name, FALSE, skipping, &newsize);
2716 if (value == NULL)
2717 {
2718 expand_string_message =
2719 string_sprintf("unknown variable name \"%s\"", name);
2720 goto EXPAND_FAILED;
2721 }
2722 }
2723
2724 /* If the data is known to be in a new buffer, newsize will be set to the
2725 size of that buffer. If this is the first thing in an expansion string,
2726 yield will be NULL; just point it at the new store instead of copying. Many
2727 expansion strings contain just one reference, so this is a useful
2728 optimization, especially for humungous headers. */
2729
2730 len = Ustrlen(value);
2731 if (yield == NULL && newsize != 0)
2732 {
2733 yield = value;
2734 size = newsize;
2735 ptr = len;
2736 }
2737 else yield = string_cat(yield, &size, &ptr, value, len);
2738
2739 continue;
2740 }
2741
2742 if (isdigit(*s))
2743 {
2744 int n;
2745 s = read_number(&n, s);
2746 if (n >= 0 && n <= expand_nmax)
2747 yield = string_cat(yield, &size, &ptr, expand_nstring[n],
2748 expand_nlength[n]);
2749 continue;
2750 }
2751
2752 /* Otherwise, if there's no '{' after $ it's an error. */
2753
2754 if (*s != '{')
2755 {
2756 expand_string_message = US"$ not followed by letter, digit, or {";
2757 goto EXPAND_FAILED;
2758 }
2759
2760 /* After { there can be various things, but they all start with
2761 an initial word, except for a number for a string match variable. */
2762
2763 if (isdigit((*(++s))))
2764 {
2765 int n;
2766 s = read_number(&n, s);
2767 if (*s++ != '}')
2768 {
2769 expand_string_message = US"} expected after number";
2770 goto EXPAND_FAILED;
2771 }
2772 if (n >= 0 && n <= expand_nmax)
2773 yield = string_cat(yield, &size, &ptr, expand_nstring[n],
2774 expand_nlength[n]);
2775 continue;
2776 }
2777
2778 if (!isalpha(*s))
2779 {
2780 expand_string_message = US"letter or digit expected after ${";
2781 goto EXPAND_FAILED;
2782 }
2783
2784 /* Allow "-" in names to cater for substrings with negative
2785 arguments. Since we are checking for known names after { this is
2786 OK. */
2787
2788 s = read_name(name, sizeof(name), s, US"_-");
2789 item_type = chop_match(name, item_table, sizeof(item_table)/sizeof(uschar *));
2790
2791 switch(item_type)
2792 {
2793 /* Handle conditionals - preserve the values of the numerical expansion
2794 variables in case they get changed by a regular expression match in the
2795 condition. If not, they retain their external settings. At the end
2796 of this "if" section, they get restored to their previous values. */
2797
2798 case EITEM_IF:
2799 {
2800 BOOL cond = FALSE;
2801 uschar *next_s;
2802 int save_expand_nmax =
2803 save_expand_strings(save_expand_nstring, save_expand_nlength);
2804
2805 while (isspace(*s)) s++;
2806 next_s = eval_condition(s, skipping? NULL : &cond);
2807 if (next_s == NULL) goto EXPAND_FAILED; /* message already set */
2808
2809 DEBUG(D_expand)
2810 debug_printf("condition: %.*s\n result: %s\n", (int)(next_s - s), s,
2811 cond? "true" : "false");
2812
2813 s = next_s;
2814
2815 /* The handling of "yes" and "no" result strings is now in a separate
2816 function that is also used by ${lookup} and ${extract} and ${run}. */
2817
2818 switch(process_yesno(
2819 skipping, /* were previously skipping */
2820 cond, /* success/failure indicator */
2821 lookup_value, /* value to reset for string2 */
2822 &s, /* input pointer */
2823 &yield, /* output pointer */
2824 &size, /* output size */
2825 &ptr, /* output current point */
2826 US"if")) /* condition type */
2827 {
2828 case 1: goto EXPAND_FAILED; /* when all is well, the */
2829 case 2: goto EXPAND_FAILED_CURLY; /* returned value is 0 */
2830 }
2831
2832 /* Restore external setting of expansion variables for continuation
2833 at this level. */
2834
2835 restore_expand_strings(save_expand_nmax, save_expand_nstring,
2836 save_expand_nlength);
2837 continue;
2838 }
2839
2840 /* Handle database lookups unless locked out. If "skipping" is TRUE, we are
2841 expanding an internal string that isn't actually going to be used. All we
2842 need to do is check the syntax, so don't do a lookup at all. Preserve the
2843 values of the numerical expansion variables in case they get changed by a
2844 partial lookup. If not, they retain their external settings. At the end
2845 of this "lookup" section, they get restored to their previous values. */
2846
2847 case EITEM_LOOKUP:
2848 {
2849 int stype, partial, affixlen, starflags;
2850 int expand_setup = 0;
2851 int nameptr = 0;
2852 uschar *key, *filename, *affix;
2853 uschar *save_lookup_value = lookup_value;
2854 int save_expand_nmax =
2855 save_expand_strings(save_expand_nstring, save_expand_nlength);
2856
2857 if ((expand_forbid & RDO_LOOKUP) != 0)
2858 {
2859 expand_string_message = US"lookup expansions are not permitted";
2860 goto EXPAND_FAILED;
2861 }
2862
2863 /* Get the key we are to look up for single-key+file style lookups.
2864 Otherwise set the key NULL pro-tem. */
2865
2866 while (isspace(*s)) s++;
2867 if (*s == '{')
2868 {
2869 key = expand_string_internal(s+1, TRUE, &s, skipping);
2870 if (key == NULL) goto EXPAND_FAILED;
2871 if (*s++ != '}') goto EXPAND_FAILED_CURLY;
2872 while (isspace(*s)) s++;
2873 }
2874 else key = NULL;
2875
2876 /* Find out the type of database */
2877
2878 if (!isalpha(*s))
2879 {
2880 expand_string_message = US"missing lookup type";
2881 goto EXPAND_FAILED;
2882 }
2883
2884 /* The type is a string that may contain special characters of various
2885 kinds. Allow everything except space or { to appear; the actual content
2886 is checked by search_findtype_partial. */
2887
2888 while (*s != 0 && *s != '{' && !isspace(*s))
2889 {
2890 if (nameptr < sizeof(name) - 1) name[nameptr++] = *s;
2891 s++;
2892 }
2893 name[nameptr] = 0;
2894 while (isspace(*s)) s++;
2895
2896 /* Now check for the individual search type and any partial or default
2897 options. Only those types that are actually in the binary are valid. */
2898
2899 stype = search_findtype_partial(name, &partial, &affix, &affixlen,
2900 &starflags);
2901 if (stype < 0)
2902 {
2903 expand_string_message = search_error_message;
2904 goto EXPAND_FAILED;
2905 }
2906
2907 /* Check that a key was provided for those lookup types that need it,
2908 and was not supplied for those that use the query style. */
2909
2910 if (!mac_islookup(stype, lookup_querystyle))
2911 {
2912 if (key == NULL)
2913 {
2914 expand_string_message = string_sprintf("missing {key} for single-"
2915 "key \"%s\" lookup", name);
2916 goto EXPAND_FAILED;
2917 }
2918 }
2919 else
2920 {
2921 if (key != NULL)
2922 {
2923 expand_string_message = string_sprintf("a single key was given for "
2924 "lookup type \"%s\", which is not a single-key lookup type", name);
2925 goto EXPAND_FAILED;
2926 }
2927 }
2928
2929 /* Get the next string in brackets and expand it. It is the file name for
2930 single-key+file lookups, and the whole query otherwise. */
2931
2932 if (*s != '{') goto EXPAND_FAILED_CURLY;
2933 filename = expand_string_internal(s+1, TRUE, &s, skipping);
2934 if (filename == NULL) goto EXPAND_FAILED;
2935 if (*s++ != '}') goto EXPAND_FAILED_CURLY;
2936 while (isspace(*s)) s++;
2937
2938 /* If this isn't a single-key+file lookup, re-arrange the variables
2939 to be appropriate for the search_ functions. */
2940
2941 if (key == NULL)
2942 {
2943 key = filename;
2944 filename = NULL;
2945 }
2946
2947 /* If skipping, don't do the next bit - just lookup_value == NULL, as if
2948 the entry was not found. Note that there is no search_close() function.
2949 Files are left open in case of re-use. At suitable places in higher logic,
2950 search_tidyup() is called to tidy all open files. This can save opening
2951 the same file several times. However, files may also get closed when
2952 others are opened, if too many are open at once. The rule is that a
2953 handle should not be used after a second search_open().
2954
2955 Request that a partial search sets up $1 and maybe $2 by passing
2956 expand_setup containing zero. If its value changes, reset expand_nmax,
2957 since new variables will have been set. Note that at the end of this
2958 "lookup" section, the old numeric variables are restored. */
2959
2960 if (skipping)
2961 lookup_value = NULL;
2962 else
2963 {
2964 void *handle = search_open(filename, stype, 0, NULL, NULL);
2965 if (handle == NULL)
2966 {
2967 expand_string_message = search_error_message;
2968 goto EXPAND_FAILED;
2969 }
2970 lookup_value = search_find(handle, filename, key, partial, affix,
2971 affixlen, starflags, &expand_setup);
2972 if (search_find_defer)
2973 {
2974 expand_string_message =
2975 string_sprintf("lookup of \"%s\" gave DEFER: %s", key,
2976 search_error_message);
2977 goto EXPAND_FAILED;
2978 }
2979 if (expand_setup > 0) expand_nmax = expand_setup;
2980 }
2981
2982 /* The handling of "yes" and "no" result strings is now in a separate
2983 function that is also used by ${if} and ${extract}. */
2984
2985 switch(process_yesno(
2986 skipping, /* were previously skipping */
2987 lookup_value != NULL, /* success/failure indicator */
2988 save_lookup_value, /* value to reset for string2 */
2989 &s, /* input pointer */
2990 &yield, /* output pointer */
2991 &size, /* output size */
2992 &ptr, /* output current point */
2993 US"lookup")) /* condition type */
2994 {
2995 case 1: goto EXPAND_FAILED; /* when all is well, the */
2996 case 2: goto EXPAND_FAILED_CURLY; /* returned value is 0 */
2997 }
2998
2999 /* Restore external setting of expansion variables for carrying on
3000 at this level, and continue. */
3001
3002 restore_expand_strings(save_expand_nmax, save_expand_nstring,
3003 save_expand_nlength);
3004 continue;
3005 }
3006
3007 /* If Perl support is configured, handle calling embedded perl subroutines,
3008 unless locked out at this time. Syntax is ${perl{sub}} or ${perl{sub}{arg}}
3009 or ${perl{sub}{arg1}{arg2}} or up to a maximum of EXIM_PERL_MAX_ARGS
3010 arguments (defined below). */
3011
3012 #ifdef EXIM_PERL
3013 #define EXIM_PERL_MAX_ARGS 8
3014
3015 case EITEM_PERL:
3016 {
3017 uschar *sub_arg[EXIM_PERL_MAX_ARGS + 2];
3018 uschar *new_yield;
3019
3020 if ((expand_forbid & RDO_PERL) != 0)
3021 {
3022 expand_string_message = US"Perl calls are not permitted";
3023 goto EXPAND_FAILED;
3024 }
3025
3026 switch(read_subs(sub_arg, EXIM_PERL_MAX_ARGS + 1, 1, &s, skipping, TRUE,
3027 US"perl"))
3028 {
3029 case 1: goto EXPAND_FAILED_CURLY;
3030 case 2:
3031 case 3: goto EXPAND_FAILED;
3032 }
3033
3034 /* If skipping, we don't actually do anything */
3035
3036 if (skipping) continue;
3037
3038 /* Start the interpreter if necessary */
3039
3040 if (!opt_perl_started)
3041 {
3042 uschar *initerror;
3043 if (opt_perl_startup == NULL)
3044 {
3045 expand_string_message = US"A setting of perl_startup is needed when "
3046 "using the Perl interpreter";
3047 goto EXPAND_FAILED;
3048 }
3049 DEBUG(D_any) debug_printf("Starting Perl interpreter\n");
3050 initerror = init_perl(opt_perl_startup);
3051 if (initerror != NULL)
3052 {
3053 expand_string_message =
3054 string_sprintf("error in perl_startup code: %s\n", initerror);
3055 goto EXPAND_FAILED;
3056 }
3057 opt_perl_started = TRUE;
3058 }
3059
3060 /* Call the function */
3061
3062 sub_arg[EXIM_PERL_MAX_ARGS + 1] = NULL;
3063 new_yield = call_perl_cat(yield, &size, &ptr, &expand_string_message,
3064 sub_arg[0], sub_arg + 1);
3065
3066 /* NULL yield indicates failure; if the message pointer has been set to
3067 NULL, the yield was undef, indicating a forced failure. Otherwise the
3068 message will indicate some kind of Perl error. */
3069
3070 if (new_yield == NULL)
3071 {
3072 if (expand_string_message == NULL)
3073 {
3074 expand_string_message =
3075 string_sprintf("Perl subroutine \"%s\" returned undef to force "
3076 "failure", sub_arg[0]);
3077 expand_string_forcedfail = TRUE;
3078 }
3079 goto EXPAND_FAILED;
3080 }
3081
3082 /* Yield succeeded. Ensure forcedfail is unset, just in case it got
3083 set during a callback from Perl. */
3084
3085 expand_string_forcedfail = FALSE;
3086 yield = new_yield;
3087 continue;
3088 }
3089 #endif /* EXIM_PERL */
3090
3091 /* Handle "readfile" to insert an entire file */
3092
3093 case EITEM_READFILE:
3094 {
3095 FILE *f;
3096 uschar *sub_arg[2];
3097
3098 if ((expand_forbid & RDO_READFILE) != 0)
3099 {
3100 expand_string_message = US"file insertions are not permitted";
3101 goto EXPAND_FAILED;
3102 }
3103
3104 switch(read_subs(sub_arg, 2, 1, &s, skipping, TRUE, US"readfile"))
3105 {
3106 case 1: goto EXPAND_FAILED_CURLY;
3107 case 2:
3108 case 3: goto EXPAND_FAILED;
3109 }
3110
3111 /* If skipping, we don't actually do anything */
3112
3113 if (skipping) continue;
3114
3115 /* Open the file and read it */
3116
3117 f = Ufopen(sub_arg[0], "rb");
3118 if (f == NULL)
3119 {
3120 expand_string_message = string_open_failed(errno, "%s", sub_arg[0]);
3121 goto EXPAND_FAILED;
3122 }
3123
3124 yield = cat_file(f, yield, &size, &ptr, sub_arg[1]);
3125 fclose(f);
3126 continue;
3127 }
3128
3129 /* Handle "readsocket" to insert data from a Unix domain socket */
3130
3131 case EITEM_READSOCK:
3132 {
3133 int fd;
3134 int timeout = 5;
3135 int save_ptr = ptr;
3136 FILE *f;
3137 struct sockaddr_un sockun; /* don't call this "sun" ! */
3138 uschar *arg;
3139 uschar *sub_arg[4];
3140
3141 if ((expand_forbid & RDO_READSOCK) != 0)
3142 {
3143 expand_string_message = US"socket insertions are not permitted";
3144 goto EXPAND_FAILED;
3145 }
3146
3147 /* Read up to 4 arguments, but don't do the end of item check afterwards,
3148 because there may be a string for expansion on failure. */
3149
3150 switch(read_subs(sub_arg, 4, 2, &s, skipping, FALSE, US"readsocket"))
3151 {
3152 case 1: goto EXPAND_FAILED_CURLY;
3153 case 2: /* Won't occur: no end check */
3154 case 3: goto EXPAND_FAILED;
3155 }
3156
3157 /* Sort out timeout, if given */
3158
3159 if (sub_arg[2] != NULL)
3160 {
3161 timeout = readconf_readtime(sub_arg[2], 0, FALSE);
3162 if (timeout < 0)
3163 {
3164 expand_string_message = string_sprintf("bad time value %s",
3165 sub_arg[2]);
3166 goto EXPAND_FAILED;
3167 }
3168 }
3169 else sub_arg[3] = NULL; /* No eol if no timeout */
3170
3171 /* If skipping, we don't actually do anything */
3172
3173 if (!skipping)
3174 {
3175 /* Make a connection to the socket */
3176
3177 if ((fd = socket(PF_UNIX, SOCK_STREAM, 0)) == -1)
3178 {
3179 expand_string_message = string_sprintf("failed to create socket: %s",
3180 strerror(errno));
3181 goto SOCK_FAIL;
3182 }
3183
3184 sockun.sun_family = AF_UNIX;
3185 sprintf(sockun.sun_path, "%.*s", (int)(sizeof(sockun.sun_path)-1),
3186 sub_arg[0]);
3187 if(connect(fd, (struct sockaddr *)(&sockun), sizeof(sockun)) == -1)
3188 {
3189 expand_string_message = string_sprintf("failed to connect to socket "
3190 "%s: %s", sub_arg[0], strerror(errno));
3191 goto SOCK_FAIL;
3192 }
3193 DEBUG(D_expand) debug_printf("connected to socket %s\n", sub_arg[0]);
3194
3195 /* Write the request string, if not empty */
3196
3197 if (sub_arg[1][0] != 0)
3198 {
3199 int len = Ustrlen(sub_arg[1]);
3200 DEBUG(D_expand) debug_printf("writing \"%s\" to socket\n",
3201 sub_arg[1]);
3202 if (write(fd, sub_arg[1], len) != len)
3203 {
3204 expand_string_message = string_sprintf("request write to socket "
3205 "failed: %s", strerror(errno));
3206 goto SOCK_FAIL;
3207 }
3208 }
3209
3210 /* Now we need to read from the socket, under a timeout. The function
3211 that reads a file can be used. */
3212
3213 f = fdopen(fd, "rb");
3214 sigalrm_seen = FALSE;
3215 alarm(timeout);
3216 yield = cat_file(f, yield, &size, &ptr, sub_arg[3]);
3217 alarm(0);
3218 fclose(f);
3219
3220 /* After a timeout, we restore the pointer in the result, that is,
3221 make sure we add nothing from the socket. */
3222
3223 if (sigalrm_seen)
3224 {
3225 ptr = save_ptr;
3226 expand_string_message = US"socket read timed out";
3227 goto SOCK_FAIL;
3228 }
3229 }
3230
3231 /* The whole thing has worked (or we were skipping). If there is a
3232 failure string following, we need to skip it. */
3233
3234 if (*s == '{')
3235 {
3236 if (expand_string_internal(s+1, TRUE, &s, TRUE) == NULL)
3237 goto EXPAND_FAILED;
3238 if (*s++ != '}') goto EXPAND_FAILED_CURLY;
3239 while (isspace(*s)) s++;
3240 }
3241 if (*s++ != '}') goto EXPAND_FAILED_CURLY;
3242 continue;
3243
3244 /* Come here on failure to create socket, connect socket, write to the
3245 socket, or timeout on reading. If another substring follows, expand and
3246 use it. Otherwise, those conditions give expand errors. */
3247
3248 SOCK_FAIL:
3249 if (*s != '{') goto EXPAND_FAILED;
3250 DEBUG(D_any) debug_printf("%s\n", expand_string_message);
3251 arg = expand_string_internal(s+1, TRUE, &s, FALSE);
3252 if (arg == NULL) goto EXPAND_FAILED;
3253 yield = string_cat(yield, &size, &ptr, arg, Ustrlen(arg));
3254 if (*s++ != '}') goto EXPAND_FAILED_CURLY;
3255 while (isspace(*s)) s++;
3256 if (*s++ != '}') goto EXPAND_FAILED_CURLY;
3257 continue;
3258 }
3259
3260 /* Handle "run" to execute a program. */
3261
3262 case EITEM_RUN:
3263 {
3264 FILE *f;
3265 uschar *old_lookup_value = NULL;
3266 uschar *arg;
3267 uschar **argv;
3268 pid_t pid;
3269 int fd_in, fd_out;
3270 int lsize = 0;
3271 int lptr = 0;
3272
3273 if ((expand_forbid & RDO_RUN) != 0)
3274 {
3275 expand_string_message = US"running a command is not permitted";
3276 goto EXPAND_FAILED;
3277 }
3278
3279 while (isspace(*s)) s++;
3280 if (*s != '{') goto EXPAND_FAILED_CURLY;
3281 arg = expand_string_internal(s+1, TRUE, &s, skipping);
3282 if (arg == NULL) goto EXPAND_FAILED;
3283 while (isspace(*s)) s++;
3284 if (*s++ != '}') goto EXPAND_FAILED_CURLY;
3285
3286 if (skipping) /* Just pretend it worked when we're skipping */
3287 {
3288 runrc = 0;
3289 }
3290 else
3291 {
3292 if (!transport_set_up_command(&argv, /* anchor for arg list */
3293 arg, /* raw command */
3294 FALSE, /* don't expand the arguments */
3295 0, /* not relevant when... */
3296 NULL, /* no transporting address */
3297 US"${run} expansion", /* for error messages */
3298 &expand_string_message)) /* where to put error message */
3299 {
3300 goto EXPAND_FAILED;
3301 }
3302
3303 /* Create the child process, making it a group leader. */
3304
3305 pid = child_open(argv, NULL, 0077, &fd_in, &fd_out, TRUE);
3306
3307 if (pid < 0)
3308 {
3309 expand_string_message =
3310 string_sprintf("couldn't create child process: %s", strerror(errno));
3311 goto EXPAND_FAILED;
3312 }
3313
3314 /* Nothing is written to the standard input. */
3315
3316 close(fd_in);
3317
3318 /* Wait for the process to finish, applying the timeout, and inspect its
3319 return code for serious disasters. Simple non-zero returns are passed on.
3320 */
3321
3322 if ((runrc = child_close(pid, 60)) < 0)
3323 {
3324 if (runrc == -256)
3325 {
3326 expand_string_message = string_sprintf("command timed out");
3327 killpg(pid, SIGKILL); /* Kill the whole process group */
3328 }
3329
3330 else if (runrc == -257)
3331 expand_string_message = string_sprintf("wait() failed: %s",
3332 strerror(errno));
3333
3334 else
3335 expand_string_message = string_sprintf("command killed by signal %d",
3336 -runrc);
3337
3338 goto EXPAND_FAILED;
3339 }
3340
3341 /* Read the pipe to get the command's output into $value (which is kept
3342 in lookup_value). */
3343
3344 f = fdopen(fd_out, "rb");
3345 old_lookup_value = lookup_value;
3346 lookup_value = NULL;
3347 lookup_value = cat_file(f, lookup_value, &lsize, &lptr, NULL);
3348 fclose(f);
3349 }
3350
3351 /* Process the yes/no strings */
3352
3353 switch(process_yesno(
3354 skipping, /* were previously skipping */
3355 runrc == 0, /* success/failure indicator */
3356 old_lookup_value, /* value to reset for string2 */
3357 &s, /* input pointer */
3358 &yield, /* output pointer */
3359 &size, /* output size */
3360 &ptr, /* output current point */
3361 US"run")) /* condition type */
3362 {
3363 case 1: goto EXPAND_FAILED; /* when all is well, the */
3364 case 2: goto EXPAND_FAILED_CURLY; /* returned value is 0 */
3365 }
3366
3367 continue;
3368 }
3369
3370 /* Handle character translation for "tr" */
3371
3372 case EITEM_TR:
3373 {
3374 int oldptr = ptr;
3375 int o2m;
3376 uschar *sub[3];
3377
3378 switch(read_subs(sub, 3, 3, &s, skipping, TRUE, US"tr"))
3379 {
3380 case 1: goto EXPAND_FAILED_CURLY;
3381 case 2:
3382 case 3: goto EXPAND_FAILED;
3383 }
3384
3385 yield = string_cat(yield, &size, &ptr, sub[0], Ustrlen(sub[0]));
3386 o2m = Ustrlen(sub[2]) - 1;
3387
3388 if (o2m >= 0) for (;