Commit | Line | Data |
---|---|---|
059ec3d9 PH |
1 | /************************************************* |
2 | * Exim - an Internet mail transport agent * | |
3 | *************************************************/ | |
4 | ||
0a49a7a4 | 5 | /* Copyright (c) University of Cambridge 1995 - 2009 */ |
059ec3d9 PH |
6 | /* See the file NOTICE for conditions of use and distribution. */ |
7 | ||
8 | /* Functions concerned with rewriting headers */ | |
9 | ||
10 | ||
11 | #include "exim.h" | |
12 | ||
13 | /* Names for testing rewriting */ | |
14 | ||
1ba28e2b | 15 | static const char *rrname[] = { |
059ec3d9 PH |
16 | " sender", |
17 | " from", | |
18 | " to", | |
19 | " cc", | |
20 | " bcc", | |
21 | "reply-to", | |
22 | "env-from", | |
23 | " env-to" | |
24 | }; | |
25 | ||
26 | /* Structure and table for finding source of address for debug printing */ | |
27 | ||
28 | typedef struct where_list_block { | |
29 | int bit; | |
1ba28e2b | 30 | const uschar *string; |
059ec3d9 PH |
31 | } where_list_block; |
32 | ||
33 | static where_list_block where_list[] = { | |
1ba28e2b PP |
34 | { rewrite_sender, CUS"sender:" }, |
35 | { rewrite_from, CUS"from:" }, | |
36 | { rewrite_to, CUS"to:" }, | |
37 | { rewrite_cc, CUS"cc:" }, | |
38 | { rewrite_bcc, CUS"bcc:" }, | |
39 | { rewrite_replyto, CUS"reply-to:" }, | |
40 | { rewrite_envfrom, CUS"env-from" }, | |
41 | { rewrite_envto, CUS"env-to" }, | |
42 | { rewrite_smtp, CUS"smtp recipient" }, | |
43 | { rewrite_smtp|rewrite_smtp_sender, CUS"smtp sender" } | |
059ec3d9 PH |
44 | }; |
45 | ||
46 | static int where_list_size = sizeof(where_list)/sizeof(where_list_block); | |
47 | ||
48 | ||
49 | ||
50 | /************************************************* | |
51 | * Ensure an address is qualified * | |
52 | *************************************************/ | |
53 | ||
54 | /* | |
55 | Arguments: | |
56 | s address to check | |
57 | is_recipient TRUE if a recipient address; FALSE if a sender address | |
58 | ||
59 | Returns: fully-qualified address | |
60 | */ | |
61 | ||
62 | uschar * | |
63 | rewrite_address_qualify(uschar *s, BOOL is_recipient) | |
64 | { | |
65 | return (parse_find_at(s) != NULL)? s : | |
66 | string_sprintf("%s@%s", s, | |
67 | is_recipient? qualify_domain_recipient : qualify_domain_sender); | |
68 | } | |
69 | ||
70 | ||
71 | ||
72 | /************************************************* | |
73 | * Rewrite a single address * | |
74 | *************************************************/ | |
75 | ||
76 | /* The yield is the input address if there is no rewriting to be done. Assume | |
77 | the input is a valid address, except in the case of SMTP-time rewriting, which | |
78 | is handled specially. When this function is called while processing filter and | |
79 | forward files, the uid may be that of the user. Ensure it is reset while | |
80 | expanding a replacement, in case that involves file lookups. | |
81 | ||
82 | Arguments: | |
83 | s address to rewrite | |
84 | flag indicates where this address comes from; it must match the | |
85 | flags in the rewriting rule | |
86 | whole if not NULL, set TRUE if any rewriting rule contained the | |
87 | "whole" bit and it is a header that is being rewritten | |
88 | add_header if TRUE and rewriting occurs, add an "X-rewrote-xxx" header | |
89 | if headers are in existence; this should be TRUE only when | |
90 | a message is being received, not during delivery | |
91 | name name of header, for use when adding X-rewrote-xxxx | |
92 | rewrite_rules chain of rewriting rules | |
93 | ||
94 | Returns: new address if rewritten; the input address if no change; | |
95 | for a header rewrite, if the "whole" bit is set, the entire | |
96 | rewritten address is returned, not just the active bit. | |
97 | */ | |
98 | ||
99 | uschar * | |
100 | rewrite_one(uschar *s, int flag, BOOL *whole, BOOL add_header, uschar *name, | |
101 | rewrite_rule *rewrite_rules) | |
102 | { | |
103 | rewrite_rule *rule; | |
104 | uschar *yield = s; | |
105 | uschar *subject = s; | |
106 | uschar *domain = NULL; | |
107 | BOOL done = FALSE; | |
108 | int rule_number = 1; | |
109 | int yield_start = 0, yield_end = 0; | |
110 | ||
111 | if (whole != NULL) *whole = FALSE; | |
112 | ||
113 | /* Scan the rewriting rules */ | |
114 | ||
115 | for (rule = rewrite_rules; | |
116 | rule != NULL && !done; | |
117 | rule_number++, rule = rule->next) | |
118 | { | |
119 | int start, end, pdomain; | |
120 | int count = 0; | |
121 | uschar *save_localpart, *save_domain; | |
122 | uschar *error, *new, *newparsed; | |
123 | ||
124 | /* Ensure that the flag matches the flags in the rule. */ | |
125 | ||
126 | if ((rule->flags & flag) == 0) continue; | |
127 | ||
128 | /* Come back here for a repeat after a successful rewrite. We do this | |
129 | only so many times. */ | |
130 | ||
131 | REPEAT_RULE: | |
132 | ||
133 | /* If this is an SMTP-time rewrite, the pattern must be a regex and | |
134 | the subject may have any structure. No local part or domain variables | |
135 | can be set for the expansion. We expand the pattern in order to be consistent | |
136 | with the other kinds of rewrite, where expansion happens inside | |
137 | match_address_list(). */ | |
138 | ||
139 | if ((flag & rewrite_smtp) != 0) | |
140 | { | |
141 | uschar *key = expand_string(rule->key); | |
142 | if (key == NULL) | |
143 | { | |
144 | if (!expand_string_forcedfail) | |
145 | log_write(0, LOG_MAIN|LOG_PANIC, "failed to expand \"%s\" while " | |
146 | "checking for SMTP rewriting: %s", rule->key, expand_string_message); | |
147 | continue; | |
148 | } | |
149 | if (match_check_string(subject, key, 0, TRUE, FALSE, FALSE, NULL) != OK) | |
150 | continue; | |
151 | new = expand_string(rule->replacement); | |
152 | } | |
153 | ||
154 | /* All other rewrites expect the input to be a valid address, so local part | |
155 | and domain variables can be set for expansion. For the first rule, to be | |
156 | applied to this address, domain will be NULL and needs to be set. */ | |
157 | ||
158 | else | |
159 | { | |
160 | if (domain == NULL) domain = Ustrrchr(subject, '@') + 1; | |
161 | ||
162 | /* Use the general function for matching an address against a list (here | |
163 | just one item, so use the "impossible value" separator UCHAR_MAX+1). */ | |
164 | ||
165 | if (match_address_list(subject, FALSE, TRUE, &(rule->key), NULL, 0, | |
166 | UCHAR_MAX + 1, NULL) != OK) | |
167 | continue; | |
168 | ||
169 | /* The source address matches, and numerical variables have been | |
170 | set up. If the replacement string consists of precisely "*" then no | |
171 | rewriting is required for this address - the behaviour is as for "fail" | |
172 | in the replacement expansion, but assuming the quit flag. */ | |
173 | ||
174 | if (Ustrcmp(rule->replacement, "*") == 0) break; | |
175 | ||
176 | /* Otherwise, expand the replacement string. Set $local_part and $domain to | |
177 | the appropriate values, restoring whatever value they previously had | |
178 | afterwards. */ | |
179 | ||
180 | save_localpart = deliver_localpart; | |
181 | save_domain = deliver_domain; | |
182 | ||
183 | /* We have subject pointing to "localpart@domain" and domain pointing to | |
184 | the domain. Temporarily terminate the local part so that it can be | |
185 | set up as an expansion variable */ | |
186 | ||
187 | domain[-1] = 0; | |
188 | deliver_localpart = subject; | |
189 | deliver_domain = domain; | |
190 | ||
191 | new = expand_string(rule->replacement); | |
192 | ||
193 | domain[-1] = '@'; | |
194 | deliver_localpart = save_localpart; | |
195 | deliver_domain = save_domain; | |
196 | } | |
197 | ||
198 | /* If the expansion failed with the "forcedfail" flag, don't generate | |
199 | an error - just give up on this rewriting rule. If the "q" flag is set, | |
200 | give up altogether. For other expansion failures we have a configuration | |
201 | error. */ | |
202 | ||
203 | if (new == NULL) | |
204 | { | |
205 | if (expand_string_forcedfail) | |
206 | { if ((rule->flags & rewrite_quit) != 0) break; else continue; } | |
207 | log_write(0, LOG_MAIN|LOG_PANIC, "Expansion of %s failed while rewriting: " | |
208 | "%s", rule->replacement, expand_string_message); | |
209 | break; | |
210 | } | |
211 | ||
212 | /* Check the what has been generated is a valid RFC 2822 address. Only | |
213 | envelope from or SMTP sender is permitted to be rewritten as <>.*/ | |
214 | ||
215 | newparsed = parse_extract_address(new, &error, &start, &end, &pdomain, | |
216 | flag == rewrite_envfrom || flag == (rewrite_smtp|rewrite_smtp_sender)); | |
217 | ||
218 | if (newparsed == NULL) | |
219 | { | |
220 | log_write(0, LOG_MAIN|LOG_PANIC, "Rewrite of %s yielded unparseable " | |
221 | "address: %s in address %s", subject, error, new); | |
222 | break; /* Give up on this address */ | |
223 | } | |
224 | ||
225 | /* A non-null unqualified address can be qualified if requested. Otherwise, | |
226 | this is an error unless it's the empty address in circumstances where that is | |
227 | permitted. */ | |
228 | ||
229 | if (pdomain == 0 && (*newparsed != 0 || | |
230 | (flag != rewrite_envfrom && flag != (rewrite_smtp|rewrite_smtp_sender)))) | |
231 | { | |
232 | if ((rule->flags & rewrite_qualify) != 0) | |
233 | { | |
234 | newparsed = rewrite_address_qualify(newparsed, TRUE); | |
235 | new = string_sprintf("%.*s%s%.*s", start, new, newparsed, | |
236 | Ustrlen(new) - end, new + end); | |
237 | end = start + Ustrlen(newparsed); | |
238 | } | |
239 | else | |
240 | { | |
241 | log_write(0, LOG_MAIN|LOG_PANIC, "Rewrite of %s yielded unqualified " | |
242 | "address \"%s\"", subject, new); | |
243 | break; /* Give up on this address */ | |
244 | } | |
245 | } | |
246 | ||
247 | /* We have a validly rewritten address */ | |
248 | ||
249 | if ((log_write_selector & L_address_rewrite) != 0 || | |
250 | (debug_selector & D_rewrite) != 0) | |
251 | { | |
252 | int i; | |
1ba28e2b | 253 | const uschar *where = CUS"?"; |
059ec3d9 PH |
254 | |
255 | for (i = 0; i < where_list_size; i++) | |
256 | { | |
257 | if (flag == where_list[i].bit) | |
258 | { | |
259 | where = where_list[i].string; | |
260 | break; | |
261 | } | |
262 | } | |
263 | log_write(L_address_rewrite, | |
264 | LOG_MAIN, "\"%s\" from %s rewritten as \"%s\" by rule %d", | |
265 | yield, where, new, rule_number); | |
266 | } | |
267 | ||
268 | /* A header will only actually be added if header_last is non-NULL, | |
269 | i.e. during message reception or delivery, but add_header should not | |
270 | be set TRUE during delivery, as otherwise multiple instances of the header | |
271 | can fill up the -H file and make it embarrassingly large. We don't need | |
272 | to set header_rewritten because the -H file always gets written at the end | |
273 | of message reception. */ | |
274 | ||
275 | if (add_header) | |
276 | header_add(htype_old, "X-rewrote-%s: %s\n", name, subject); | |
277 | ||
278 | /* Handle the case when replacement of the whole address is possible. | |
279 | This happens only when whole is not NULL and we are rewriting a header. | |
280 | If *whole is already TRUE it means that a previous rule had the w | |
281 | flag set and so we must preserve the non-active portion of the current | |
282 | subject unless the current rule also has the w flag set. */ | |
283 | ||
284 | if (whole != NULL && (flag & rewrite_all_headers) != 0) | |
285 | { | |
286 | /* Current rule has the w flag set. We must ensure the phrase parts | |
287 | are syntactically valid if they are present. */ | |
288 | ||
289 | if ((rule->flags & rewrite_whole) != 0) | |
290 | { | |
291 | if (start > 0 && new[start-1] == '<') | |
292 | { | |
293 | uschar *p1 = new + start - 1; | |
294 | uschar *p2 = new + end + 1; | |
295 | uschar *pf1, *pf2; | |
296 | uschar buff1[256], buff2[256]; | |
297 | ||
298 | while (p1 > new && p1[-1] == ' ') p1--; | |
299 | pf1 = parse_fix_phrase(new, p1 - new, buff1, sizeof(buff1)); | |
300 | while (*p2 == ' ') p2++; | |
301 | pf2 = parse_fix_phrase(p2, Ustrlen(p2), buff2, sizeof(buff2)); | |
302 | ||
303 | /* Note that pf1 and pf2 are NOT necessarily buff1 and buff2. For | |
304 | a non-RFC 2047 phrase that does not need to be RFC 2822 quoted, they | |
305 | will be buff1+1 and buff2+1. */ | |
306 | ||
307 | start = Ustrlen(pf1) + start + new - p1; | |
308 | end = start + Ustrlen(newparsed); | |
309 | new = string_sprintf("%s%.*s%s", pf1, p2 - p1, p1, pf2); | |
310 | } | |
311 | ||
312 | /* Now accept the whole thing */ | |
313 | ||
314 | yield = new; | |
315 | yield_start = start; | |
316 | yield_end = end; | |
317 | subject = newparsed; | |
318 | *whole = TRUE; | |
319 | } | |
320 | ||
321 | /* Current rule does not have the w flag set; if not previously | |
322 | done any whole rewriting, behave in non-whole manner. */ | |
323 | ||
324 | else if (!*whole) goto NEVER_WHOLE; | |
325 | ||
326 | /* Current rule does not have the w flag set, but a previous | |
327 | rule did rewrite the whole address. Thus yield and subject will be | |
328 | different. Preserve the previous non-active part of the address. */ | |
329 | ||
330 | else | |
331 | { | |
332 | subject = newparsed; | |
333 | new = string_sprintf("%.*s%s%n%s", | |
334 | yield_start, yield, subject, &end, yield + yield_end); | |
335 | yield_end = end; | |
336 | yield = new; | |
337 | } | |
338 | } | |
339 | ||
340 | /* Rule just rewrites active part, or handling an envelope. This | |
341 | code is obeyed only when all rules so far have not done "whole" | |
342 | replacement. */ | |
343 | ||
344 | else | |
345 | { | |
346 | NEVER_WHOLE: | |
347 | subject = yield = newparsed; | |
348 | } | |
349 | ||
350 | domain = NULL; /* Reset for next rule */ | |
351 | ||
352 | /* If no further rewrites are to be done, set the done flag. This allows | |
353 | repeats of the current rule if configured before breaking the loop. */ | |
354 | ||
355 | if ((rule->flags & rewrite_quit) != 0) done = TRUE; | |
356 | ||
357 | /* Allow the current rule to be applied up to 10 times if | |
358 | requested. */ | |
359 | ||
360 | if ((rule->flags & rewrite_repeat) != 0) | |
361 | { | |
362 | if (count++ < 10) goto REPEAT_RULE; | |
363 | log_write(0, LOG_MAIN|LOG_PANIC, "rewrite rule repeat ignored after 10 " | |
364 | "times"); | |
365 | } | |
366 | } | |
367 | ||
368 | /* Unset expansion numeric variables, and that's it. */ | |
369 | ||
370 | expand_nmax = -1; | |
371 | return yield; | |
372 | } | |
373 | ||
374 | ||
375 | ||
376 | /************************************************* | |
377 | * Ensure qualification and rewrite * | |
378 | *************************************************/ | |
379 | ||
380 | /* This function is called for envelope addresses, the boolean specifying | |
381 | whether a recipient or a sender. It must first of all ensure the address is | |
382 | fully qualified, and then apply any relevant re-writing rules. The add-header | |
383 | flag causes a header to be added, recording the old address. This is marked | |
384 | "old", so that it is never transported anywhere; it exists for local checking | |
385 | and debugging purposes. | |
386 | ||
387 | Arguments: | |
388 | s the address to be considered | |
389 | is_recipient TRUE for recipient addresses; FALSE otherwise | |
390 | add_header add "X-rewrote-xxx" header when rewriting; this is | |
391 | set TRUE only for calls from the reception functions | |
392 | rewrite_rules points to chain of rewrite rules | |
393 | existflags bits indicating which headers there are rewrites for | |
394 | (just an optimisation) | |
395 | ||
396 | Returns: possibly rewritten address | |
397 | */ | |
398 | ||
399 | uschar * | |
400 | rewrite_address(uschar *s, BOOL is_recipient, BOOL add_header, | |
401 | rewrite_rule *rewrite_rules, int existflags) | |
402 | { | |
403 | int flag = is_recipient? rewrite_envto : rewrite_envfrom; | |
404 | s = rewrite_address_qualify(s, is_recipient); | |
405 | if ((existflags & flag) != 0) | |
406 | { | |
407 | uschar *new = rewrite_one(s, flag, NULL, add_header, is_recipient? | |
408 | US"original-recipient" : US"sender", rewrite_rules); | |
409 | if (new != s) s = new; | |
410 | } | |
411 | return s; | |
412 | } | |
413 | ||
414 | ||
415 | ||
416 | /************************************************* | |
417 | * Qualify and possibly rewrite one header * | |
418 | *************************************************/ | |
419 | ||
420 | /* This is called only from rewrite_header() below, either when reading a | |
421 | message. or when routing, in order to rewrite addresses that get changed by a | |
422 | router. This is normally the addition of full qualification to a partial | |
423 | domain. The first rewriting rule in this case is "change routed_old into | |
424 | routed_new", and it applies to all header lines that contain addresses. Then | |
425 | header-specific rewriting rules are applied. | |
426 | ||
427 | Before rewriting can be done, addresses without domains have to be qualified. | |
428 | This should only be done for messages from "local" senders. This is a difficult | |
429 | concept to pin down, what with the use of SMTP both as a submission and as a | |
430 | transmission protocol. Exim normally requires incoming SMTP to contain fully- | |
431 | qualified addresses, but there are options to permit unqualified ones from | |
432 | certain hosts. For those hosts only, addresses in headers can also be | |
433 | qualified. For other hosts, unqualified addresses in headers do not get touched | |
434 | in any way. For locally sourced messages, unqualified addresses always get | |
435 | qualified, except when -bnq is used to explicitly suppress this. | |
436 | ||
437 | Arguments: | |
438 | h pointer to header line block | |
439 | flag indicates which header this is | |
440 | routed_old if not NULL, this is a rewrite caused by a router, changing | |
441 | this domain into routed_new | |
442 | routed_new new routed domain if routed_old is not NULL | |
443 | rewrite_rules points to chain of rewriting rules | |
444 | existflags bits indicating which rewrites exist | |
445 | replace if TRUE, insert the new header in the chain after the old | |
446 | one, and mark the old one "replaced" | |
447 | ||
448 | Returns: NULL if header unchanged; otherwise the rewritten header | |
449 | */ | |
450 | ||
451 | static header_line * | |
452 | rewrite_one_header(header_line *h, int flag, uschar *routed_old, | |
453 | uschar *routed_new, rewrite_rule *rewrite_rules, int existflags, BOOL replace) | |
454 | { | |
455 | int lastnewline = 0; | |
456 | header_line *newh = NULL; | |
457 | void *function_reset_point = store_get(0); | |
458 | uschar *s = Ustrchr(h->text, ':') + 1; | |
459 | while (isspace(*s)) s++; | |
460 | ||
461 | DEBUG(D_rewrite) | |
462 | debug_printf("rewrite_one_header: type=%c:\n %s", h->type, h->text); | |
463 | ||
464 | parse_allow_group = TRUE; /* Allow group syntax */ | |
465 | ||
466 | /* Loop for multiple addresses in the header. We have to go through them all | |
467 | in case any need qualifying, even if there's no rewriting. Pathological headers | |
468 | may have thousands of addresses in them, so cause the store to be reset for | |
469 | any that don't actually get rewritten. We also play silly games for those that | |
470 | _are_ rewritten so as to avoid runaway store usage for these kinds of header. | |
471 | We want to avoid keeping store for any intermediate versions. */ | |
472 | ||
473 | while (*s != 0) | |
474 | { | |
475 | uschar *sprev; | |
476 | uschar *ss = parse_find_address_end(s, FALSE); | |
477 | uschar *recipient, *new, *errmess; | |
478 | void *loop_reset_point = store_get(0); | |
479 | BOOL changed = FALSE; | |
480 | int terminator = *ss; | |
481 | int start, end, domain; | |
482 | ||
483 | /* Temporarily terminate the string at this point, and extract the | |
484 | operative address within. Then put back the terminator and prepare for | |
485 | the next address, saving the start of the old one. */ | |
486 | ||
487 | *ss = 0; | |
488 | recipient = parse_extract_address(s,&errmess,&start,&end,&domain,FALSE); | |
489 | *ss = terminator; | |
490 | sprev = s; | |
491 | s = ss + (terminator? 1:0); | |
492 | while (isspace(*s)) s++; | |
493 | ||
494 | /* There isn't much we can do for syntactic disasters at this stage. | |
495 | Pro tem (possibly for ever) ignore them. */ | |
496 | ||
497 | if (recipient == NULL) | |
498 | { | |
499 | store_reset(loop_reset_point); | |
500 | continue; | |
501 | } | |
502 | ||
503 | /* If routed_old is not NULL, this is a rewrite caused by a router, | |
504 | consisting of changing routed_old into routed_new, and applying to all | |
505 | headers. If the header address has no domain, it is excluded, since a router | |
506 | rewrite affects domains only. The new value should always be fully qualified, | |
507 | but it may be something that has an explicit re-write rule set, so we need to | |
508 | check the configured rules subsequently as well. (Example: there's an | |
509 | explicit rewrite turning *.foo.com into foo.com, and an address is supplied | |
510 | as abc@xyz, which the DNS lookup turns into abc@xyz.foo.com). However, if no | |
511 | change is made here, don't bother carrying on. */ | |
512 | ||
513 | if (routed_old != NULL) | |
514 | { | |
515 | if (domain <= 0 || strcmpic(recipient+domain, routed_old) != 0) continue; | |
516 | recipient[domain-1] = 0; | |
517 | new = string_sprintf("%s@%s", recipient, routed_new); | |
518 | DEBUG(D_rewrite) | |
519 | { | |
520 | recipient[domain-1] = '@'; | |
521 | debug_printf("%s rewritten by router as %s\n", recipient, new); | |
522 | } | |
523 | recipient = new; | |
524 | changed = TRUE; | |
525 | } | |
526 | ||
527 | /* This is not a router-inspired rewrite. Ensure the address is fully | |
528 | qualified if that is permitted. If an unqualified address was received | |
529 | from a host that isn't listed, do not continue rewriting this address. | |
530 | Sender, From or Reply-To headers are treated as senders, the rest as | |
531 | recipients. This matters only when there are different qualify strings. */ | |
532 | ||
533 | else | |
534 | { | |
535 | BOOL is_recipient = | |
536 | (flag & (rewrite_sender | rewrite_from | rewrite_replyto)) == 0; | |
537 | new = rewrite_address_qualify(recipient, is_recipient); | |
538 | changed = (new != recipient); | |
539 | recipient = new; | |
540 | ||
541 | /* Can only qualify if permitted; if not, no rewrite. */ | |
542 | ||
543 | if (changed && ((is_recipient && !allow_unqualified_recipient) || | |
544 | (!is_recipient && !allow_unqualified_sender))) | |
545 | { | |
546 | store_reset(loop_reset_point); | |
547 | continue; | |
548 | } | |
549 | } | |
550 | ||
551 | /* If there are rewrite rules for this type of header, apply | |
552 | them. This test is just for efficiency, to save scanning the rules | |
553 | in cases when nothing is going to change. If any rewrite rule had the | |
554 | "whole" flag set, adjust the pointers so that the whole address gets | |
555 | replaced, except possibly a final \n. */ | |
556 | ||
557 | if ((existflags & flag) != 0) | |
558 | { | |
559 | BOOL whole; | |
560 | new = rewrite_one(recipient, flag, &whole, FALSE, NULL, rewrite_rules); | |
561 | if (new != recipient) | |
562 | { | |
563 | changed = TRUE; | |
564 | if (whole) | |
565 | { | |
566 | start = 0; | |
567 | end = ss - sprev; | |
568 | if (sprev[end-1] == '\n') end--; | |
569 | } | |
570 | } | |
571 | } | |
572 | ||
573 | /* If nothing has changed, lose all dynamic store obtained in this loop, and | |
574 | move on to the next address. We can't reset to the function start store | |
575 | point, because we may have a rewritten line from a previous time round the | |
576 | loop. */ | |
577 | ||
578 | if (!changed) store_reset(loop_reset_point); | |
579 | ||
580 | /* If the address has changed, create a new header containing the | |
581 | rewritten address. We do not need to set the chain pointers at this | |
582 | stage. We want to avoid using more and more memory if the header is very long | |
583 | and contains lots and lots of rewritten addresses. Therefore, we build the | |
584 | new text string in malloc store, then at the end we reset dynamic store | |
585 | before copying the new header to a new block (and then freeing the malloc | |
586 | block). The header must end up in dynamic store so that it's freed at the end | |
587 | of receiving a message. */ | |
588 | ||
589 | else | |
590 | { | |
591 | int remlen; | |
592 | int newlen = Ustrlen(new); | |
593 | int oldlen = end - start; | |
594 | ||
595 | header_line *prev = (newh == NULL)? h : newh; | |
596 | uschar *newt = store_malloc(prev->slen - oldlen + newlen + 4); | |
597 | uschar *newtstart = newt; | |
598 | ||
599 | int type = prev->type; | |
600 | int slen = prev->slen - oldlen + newlen; | |
601 | ||
602 | /* Build the new header text by copying the old and putting in the | |
603 | replacement. This process may make the header substantially longer | |
604 | than it was before - qualification of a list of bare addresses can | |
605 | often do this - so we stick in a newline after the re-written address | |
606 | if it has increased in length and ends more than 40 characters in. In | |
607 | fact, the code is not perfect, since it does not scan for existing | |
608 | newlines in the header, but it doesn't seem worth going to that | |
609 | amount of trouble. */ | |
610 | ||
611 | Ustrncpy(newt, prev->text, sprev - prev->text + start); | |
612 | newt += sprev - prev->text + start; | |
613 | *newt = 0; | |
614 | Ustrcat(newt, new); | |
615 | newt += newlen; | |
616 | remlen = s - (sprev + end); | |
617 | if (remlen > 0) | |
618 | { | |
619 | Ustrncpy(newt, sprev + end, remlen); | |
620 | newt += remlen; | |
621 | *newt = 0; | |
622 | } | |
623 | ||
624 | /* Must check that there isn't a newline here anyway; in particular, there | |
625 | will be one at the very end of the header, where we DON'T want to insert | |
626 | another one! The pointer s has been skipped over white space, so just | |
627 | look back to see if the last non-space-or-tab was a newline. */ | |
628 | ||
629 | if (newlen > oldlen && newt - newtstart - lastnewline > 40) | |
630 | { | |
631 | uschar *p = s - 1; | |
632 | while (p >= prev->text && (*p == ' ' || *p == '\t')) p--; | |
633 | if (*p != '\n') | |
634 | { | |
635 | lastnewline = newt - newtstart; | |
636 | Ustrcat(newt, "\n\t"); | |
637 | slen += 2; | |
638 | } | |
639 | } | |
640 | ||
641 | /* Finally, the remaining unprocessed addresses, if any. */ | |
642 | ||
643 | Ustrcat(newt, s); | |
644 | ||
645 | DEBUG(D_rewrite) debug_printf("newlen=%d newtype=%c newtext:\n%s", | |
646 | slen, type, newtstart); | |
647 | ||
648 | /* Compute the length of the rest of the header line before we possibly | |
649 | flatten a previously rewritten copy. */ | |
650 | ||
651 | remlen = (s - prev->text) - oldlen + newlen; | |
652 | ||
653 | /* We have the new text in a malloc block. That enables us to release all | |
654 | the memory that has been used, back to the point at which the function was | |
655 | entered. Then set up a new header in dynamic store. This will override a | |
656 | rewritten copy from a previous time round this loop. */ | |
657 | ||
658 | store_reset(function_reset_point); | |
659 | newh = store_get(sizeof(header_line)); | |
660 | newh->type = type; | |
661 | newh->slen = slen; | |
662 | newh->text = string_copyn(newtstart, slen); | |
663 | store_free(newtstart); | |
664 | ||
665 | /* Set up for scanning the rest of the header */ | |
666 | ||
667 | s = newh->text + remlen; | |
668 | DEBUG(D_rewrite) debug_printf("remainder: %s", (*s == 0)? US"\n" : s); | |
669 | } | |
670 | } | |
671 | ||
672 | parse_allow_group = FALSE; /* Reset group flags */ | |
673 | parse_found_group = FALSE; | |
674 | ||
675 | /* If a rewrite happened and "replace" is true, put the new header into the | |
676 | chain following the old one, and mark the old one as replaced. */ | |
677 | ||
678 | if (newh != NULL && replace) | |
679 | { | |
680 | newh->next = h->next; | |
681 | if (newh->next == NULL) header_last = newh; | |
682 | h->type = htype_old; | |
683 | h->next = newh; | |
684 | } | |
685 | ||
686 | return newh; | |
687 | } | |
688 | ||
689 | ||
690 | ||
691 | ||
692 | /************************************************* | |
693 | * Rewrite a header line * | |
694 | *************************************************/ | |
695 | ||
696 | /* This function may be passed any old header line. It must detect those which | |
697 | contain addresses, then then apply any rewriting rules that apply. If | |
698 | routed_old is NULL, only the configured rewriting rules are consulted. | |
699 | Otherwise, the rewriting rule is "change routed_old into routed_new", and it | |
700 | applies to all header lines that contain addresses. Then header-specific | |
701 | rewriting rules are applied. | |
702 | ||
703 | The old header line is flagged as "old". Old headers are saved on the spool for | |
704 | debugging but are never sent to any recipients. | |
705 | ||
706 | Arguments: | |
707 | h header line to rewrite | |
708 | routed_old if not NULL, this is a rewrite caused by a router, changing | |
709 | this domain into routed_new | |
710 | routed_new new routed domain if routed_old is not NULL | |
711 | rewrite_rules points to chain of rewrite rules | |
712 | existflags bits indicating which rewrites exist | |
713 | replace if TRUE, the new header is inserted into the header chain | |
714 | after the old one, and the old one is marked replaced | |
715 | ||
716 | Returns: NULL if header unchanged; otherwise the rewritten header | |
717 | */ | |
718 | ||
719 | header_line * | |
720 | rewrite_header(header_line *h, uschar *routed_old, uschar *routed_new, | |
721 | rewrite_rule *rewrite_rules, int existflags, BOOL replace) | |
722 | { | |
723 | switch (h->type) | |
724 | { | |
725 | case htype_sender: | |
726 | return rewrite_one_header(h, rewrite_sender, routed_old, routed_new, | |
727 | rewrite_rules, existflags, replace); | |
728 | ||
729 | case htype_from: | |
730 | return rewrite_one_header(h, rewrite_from, routed_old, routed_new, | |
731 | rewrite_rules, existflags, replace); | |
732 | ||
733 | case htype_to: | |
734 | return rewrite_one_header(h, rewrite_to, routed_old, routed_new, | |
735 | rewrite_rules, existflags, replace); | |
736 | ||
737 | case htype_cc: | |
738 | return rewrite_one_header(h, rewrite_cc, routed_old, routed_new, | |
739 | rewrite_rules, existflags, replace); | |
740 | ||
741 | case htype_bcc: | |
742 | return rewrite_one_header(h, rewrite_bcc, routed_old, routed_new, | |
743 | rewrite_rules, existflags, replace); | |
744 | ||
745 | case htype_reply_to: | |
746 | return rewrite_one_header(h, rewrite_replyto, routed_old, routed_new, | |
747 | rewrite_rules, existflags, replace); | |
748 | } | |
749 | ||
750 | return NULL; | |
751 | } | |
752 | ||
753 | ||
754 | ||
755 | /************************************************ | |
756 | * Test rewriting rules * | |
757 | ************************************************/ | |
758 | ||
759 | /* Called from the mainline as a result of the -brw option. Test the | |
760 | address for all possible cases. | |
761 | ||
762 | Argument: the address to test | |
763 | Returns: nothing | |
764 | */ | |
765 | ||
766 | void rewrite_test(uschar *s) | |
767 | { | |
768 | uschar *recipient, *error; | |
769 | int i, start, end, domain; | |
770 | BOOL done_smtp = FALSE; | |
771 | ||
772 | if (rewrite_existflags == 0) | |
773 | { | |
774 | printf("No rewrite rules are defined\n"); | |
775 | return; | |
776 | } | |
777 | ||
778 | /* Do SMTP rewrite only if a rule with the S flag exists. Allow <> by | |
779 | pretending it is a sender. */ | |
780 | ||
781 | if ((rewrite_existflags & rewrite_smtp) != 0) | |
782 | { | |
783 | uschar *new = rewrite_one(s, rewrite_smtp|rewrite_smtp_sender, NULL, FALSE, | |
784 | US"", global_rewrite_rules); | |
785 | if (new != s) | |
786 | { | |
787 | if (*new == 0) | |
788 | printf(" SMTP: <>\n"); | |
789 | else | |
790 | printf(" SMTP: %s\n", new); | |
791 | done_smtp = TRUE; | |
792 | } | |
793 | } | |
794 | ||
795 | /* Do the other rewrites only if a rule without the S flag exists */ | |
796 | ||
797 | if ((rewrite_existflags & ~rewrite_smtp) == 0) return; | |
798 | ||
799 | /* Qualify if necessary before extracting the address */ | |
800 | ||
801 | if (parse_find_at(s) == NULL) | |
802 | s = string_sprintf("%s@%s", s, qualify_domain_recipient); | |
803 | ||
804 | recipient = parse_extract_address(s, &error, &start, &end, &domain, FALSE); | |
805 | ||
806 | if (recipient == NULL) | |
807 | { | |
808 | if (!done_smtp) | |
809 | printf("Syntax error in %s\n%c%s\n", s, toupper(error[0]), error+1); | |
810 | return; | |
811 | } | |
812 | ||
813 | for (i = 0; i < 8; i++) | |
814 | { | |
815 | BOOL whole = FALSE; | |
816 | int flag = 1 << i; | |
817 | uschar *new = rewrite_one(recipient, flag, &whole, FALSE, US"", | |
818 | global_rewrite_rules); | |
819 | printf("%s: ", rrname[i]); | |
820 | if (*new == 0) | |
821 | printf("<>\n"); | |
822 | else if (whole || (flag & rewrite_all_headers) == 0) | |
823 | printf("%s\n", CS new); | |
824 | else printf("%.*s%s%s\n", start, s, new, s+end); | |
825 | } | |
826 | } | |
827 | ||
828 | /* End of rewrite.c */ |