Update one test to avoid prodding the live Exim for a callout (can now
[exim.git] / src / src / verify.c
CommitLineData
de3a88fb 1/* $Cambridge: exim/src/src/verify.c,v 1.27 2005/09/14 09:40:55 ph10 Exp $ */
059ec3d9
PH
2
3/*************************************************
4* Exim - an Internet mail transport agent *
5*************************************************/
6
c988f1f4 7/* Copyright (c) University of Cambridge 1995 - 2005 */
059ec3d9
PH
8/* See the file NOTICE for conditions of use and distribution. */
9
10/* Functions concerned with verifying things. The original code for callout
11caching was contributed by Kevin Fleming (but I hacked it around a bit). */
12
13
14#include "exim.h"
15
16
17/* Structure for caching DNSBL lookups */
18
19typedef struct dnsbl_cache_block {
20 dns_address *rhs;
21 uschar *text;
22 int rc;
23 BOOL text_set;
24} dnsbl_cache_block;
25
26
27/* Anchor for DNSBL cache */
28
29static tree_node *dnsbl_cache = NULL;
30
31
32
33/*************************************************
34* Retrieve a callout cache record *
35*************************************************/
36
37/* If a record exists, check whether it has expired.
38
39Arguments:
40 dbm_file an open hints file
41 key the record key
42 type "address" or "domain"
43 positive_expire expire time for positive records
44 negative_expire expire time for negative records
45
46Returns: the cache record if a non-expired one exists, else NULL
47*/
48
49static dbdata_callout_cache *
50get_callout_cache_record(open_db *dbm_file, uschar *key, uschar *type,
51 int positive_expire, int negative_expire)
52{
53BOOL negative;
54int length, expire;
55time_t now;
56dbdata_callout_cache *cache_record;
57
58cache_record = dbfn_read_with_length(dbm_file, key, &length);
59
60if (cache_record == NULL)
61 {
62 HDEBUG(D_verify) debug_printf("callout cache: no %s record found\n", type);
63 return NULL;
64 }
65
66/* We treat a record as "negative" if its result field is not positive, or if
67it is a domain record and the postmaster field is negative. */
68
69negative = cache_record->result != ccache_accept ||
70 (type[0] == 'd' && cache_record->postmaster_result == ccache_reject);
71expire = negative? negative_expire : positive_expire;
72now = time(NULL);
73
74if (now - cache_record->time_stamp > expire)
75 {
76 HDEBUG(D_verify) debug_printf("callout cache: %s record expired\n", type);
77 return NULL;
78 }
79
80/* If this is a non-reject domain record, check for the obsolete format version
81that doesn't have the postmaster and random timestamps, by looking at the
82length. If so, copy it to a new-style block, replicating the record's
83timestamp. Then check the additional timestamps. (There's no point wasting
84effort if connections are rejected.) */
85
86if (type[0] == 'd' && cache_record->result != ccache_reject)
87 {
88 if (length == sizeof(dbdata_callout_cache_obs))
89 {
90 dbdata_callout_cache *new = store_get(sizeof(dbdata_callout_cache));
91 memcpy(new, cache_record, length);
92 new->postmaster_stamp = new->random_stamp = new->time_stamp;
93 cache_record = new;
94 }
95
96 if (now - cache_record->postmaster_stamp > expire)
97 cache_record->postmaster_result = ccache_unknown;
98
99 if (now - cache_record->random_stamp > expire)
100 cache_record->random_result = ccache_unknown;
101 }
102
103HDEBUG(D_verify) debug_printf("callout cache: found %s record\n", type);
104return cache_record;
105}
106
107
108
109/*************************************************
110* Do callout verification for an address *
111*************************************************/
112
113/* This function is called from verify_address() when the address has routed to
114a host list, and a callout has been requested. Callouts are expensive; that is
115why a cache is used to improve the efficiency.
116
117Arguments:
118 addr the address that's been routed
119 host_list the list of hosts to try
120 tf the transport feedback block
121
122 ifstring "interface" option from transport, or NULL
123 portstring "port" option from transport, or NULL
124 protocolstring "protocol" option from transport, or NULL
125 callout the per-command callout timeout
4deaf07d
PH
126 callout_overall the overall callout timeout (if < 0 use 4*callout)
127 callout_connect the callout connection timeout (if < 0 use callout)
059ec3d9
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128 options the verification options - these bits are used:
129 vopt_is_recipient => this is a recipient address
130 vopt_callout_no_cache => don't use callout cache
2a4be8f9 131 vopt_callout_fullpm => if postmaster check, do full one
059ec3d9
PH
132 vopt_callout_random => do the "random" thing
133 vopt_callout_recipsender => use real sender for recipient
134 vopt_callout_recippmaster => use postmaster for recipient
135 se_mailfrom MAIL FROM address for sender verify; NULL => ""
136 pm_mailfrom if non-NULL, do the postmaster check with this sender
137
138Returns: OK/FAIL/DEFER
139*/
140
141static int
142do_callout(address_item *addr, host_item *host_list, transport_feedback *tf,
8e669ac1 143 int callout, int callout_overall, int callout_connect, int options,
4deaf07d 144 uschar *se_mailfrom, uschar *pm_mailfrom)
059ec3d9
PH
145{
146BOOL is_recipient = (options & vopt_is_recipient) != 0;
147BOOL callout_no_cache = (options & vopt_callout_no_cache) != 0;
148BOOL callout_random = (options & vopt_callout_random) != 0;
149
150int yield = OK;
151BOOL done = FALSE;
152uschar *address_key;
153uschar *from_address;
154uschar *random_local_part = NULL;
750af86e 155uschar *save_deliver_domain = deliver_domain;
8e669ac1 156uschar **failure_ptr = is_recipient?
2c7db3f5 157 &recipient_verify_failure : &sender_verify_failure;
059ec3d9
PH
158open_db dbblock;
159open_db *dbm_file = NULL;
160dbdata_callout_cache new_domain_record;
161dbdata_callout_cache_address new_address_record;
162host_item *host;
163time_t callout_start_time;
164
165new_domain_record.result = ccache_unknown;
166new_domain_record.postmaster_result = ccache_unknown;
167new_domain_record.random_result = ccache_unknown;
168
169memset(&new_address_record, 0, sizeof(new_address_record));
170
171/* For a recipient callout, the key used for the address cache record must
172include the sender address if we are using the real sender in the callout,
173because that may influence the result of the callout. */
174
175address_key = addr->address;
176from_address = US"";
177
178if (is_recipient)
179 {
180 if ((options & vopt_callout_recipsender) != 0)
181 {
182 address_key = string_sprintf("%s/<%s>", addr->address, sender_address);
183 from_address = sender_address;
184 }
185 else if ((options & vopt_callout_recippmaster) != 0)
186 {
187 address_key = string_sprintf("%s/<postmaster@%s>", addr->address,
188 qualify_domain_sender);
189 from_address = string_sprintf("postmaster@%s", qualify_domain_sender);
190 }
191 }
192
193/* For a sender callout, we must adjust the key if the mailfrom address is not
194empty. */
195
196else
197 {
198 from_address = (se_mailfrom == NULL)? US"" : se_mailfrom;
199 if (from_address[0] != 0)
200 address_key = string_sprintf("%s/<%s>", addr->address, from_address);
201 }
202
203/* Open the callout cache database, it it exists, for reading only at this
204stage, unless caching has been disabled. */
205
206if (callout_no_cache)
207 {
208 HDEBUG(D_verify) debug_printf("callout cache: disabled by no_cache\n");
209 }
210else if ((dbm_file = dbfn_open(US"callout", O_RDWR, &dbblock, FALSE)) == NULL)
211 {
212 HDEBUG(D_verify) debug_printf("callout cache: not available\n");
213 }
214
215/* If a cache database is available see if we can avoid the need to do an
216actual callout by making use of previously-obtained data. */
217
218if (dbm_file != NULL)
219 {
220 dbdata_callout_cache_address *cache_address_record;
221 dbdata_callout_cache *cache_record = get_callout_cache_record(dbm_file,
222 addr->domain, US"domain",
223 callout_cache_domain_positive_expire,
224 callout_cache_domain_negative_expire);
225
226 /* If an unexpired cache record was found for this domain, see if the callout
227 process can be short-circuited. */
228
229 if (cache_record != NULL)
230 {
231 /* If an early command (up to and including MAIL FROM:<>) was rejected,
232 there is no point carrying on. The callout fails. */
233
234 if (cache_record->result == ccache_reject)
235 {
236 setflag(addr, af_verify_nsfail);
237 HDEBUG(D_verify)
238 debug_printf("callout cache: domain gave initial rejection, or "
239 "does not accept HELO or MAIL FROM:<>\n");
240 setflag(addr, af_verify_nsfail);
241 addr->user_message = US"(result of an earlier callout reused).";
242 yield = FAIL;
8e669ac1 243 *failure_ptr = US"mail";
059ec3d9
PH
244 goto END_CALLOUT;
245 }
246
247 /* If a previous check on a "random" local part was accepted, we assume
248 that the server does not do any checking on local parts. There is therefore
249 no point in doing the callout, because it will always be successful. If a
250 random check previously failed, arrange not to do it again, but preserve
251 the data in the new record. If a random check is required but hasn't been
252 done, skip the remaining cache processing. */
253
254 if (callout_random) switch(cache_record->random_result)
255 {
256 case ccache_accept:
257 HDEBUG(D_verify)
258 debug_printf("callout cache: domain accepts random addresses\n");
259 goto END_CALLOUT; /* Default yield is OK */
260
261 case ccache_reject:
262 HDEBUG(D_verify)
263 debug_printf("callout cache: domain rejects random addresses\n");
264 callout_random = FALSE;
265 new_domain_record.random_result = ccache_reject;
266 new_domain_record.random_stamp = cache_record->random_stamp;
267 break;
268
269 default:
270 HDEBUG(D_verify)
271 debug_printf("callout cache: need to check random address handling "
272 "(not cached or cache expired)\n");
273 goto END_CACHE;
274 }
275
276 /* If a postmaster check is requested, but there was a previous failure,
277 there is again no point in carrying on. If a postmaster check is required,
278 but has not been done before, we are going to have to do a callout, so skip
279 remaining cache processing. */
280
281 if (pm_mailfrom != NULL)
282 {
283 if (cache_record->postmaster_result == ccache_reject)
284 {
285 setflag(addr, af_verify_pmfail);
286 HDEBUG(D_verify)
287 debug_printf("callout cache: domain does not accept "
288 "RCPT TO:<postmaster@domain>\n");
289 yield = FAIL;
8e669ac1 290 *failure_ptr = US"postmaster";
059ec3d9
PH
291 setflag(addr, af_verify_pmfail);
292 addr->user_message = US"(result of earlier verification reused).";
293 goto END_CALLOUT;
294 }
295 if (cache_record->postmaster_result == ccache_unknown)
296 {
297 HDEBUG(D_verify)
298 debug_printf("callout cache: need to check RCPT "
299 "TO:<postmaster@domain> (not cached or cache expired)\n");
300 goto END_CACHE;
301 }
302
303 /* If cache says OK, set pm_mailfrom NULL to prevent a redundant
304 postmaster check if the address itself has to be checked. Also ensure
305 that the value in the cache record is preserved (with its old timestamp).
306 */
307
308 HDEBUG(D_verify) debug_printf("callout cache: domain accepts RCPT "
309 "TO:<postmaster@domain>\n");
310 pm_mailfrom = NULL;
311 new_domain_record.postmaster_result = ccache_accept;
312 new_domain_record.postmaster_stamp = cache_record->postmaster_stamp;
313 }
314 }
315
316 /* We can't give a result based on information about the domain. See if there
317 is an unexpired cache record for this specific address (combined with the
318 sender address if we are doing a recipient callout with a non-empty sender).
319 */
320
321 cache_address_record = (dbdata_callout_cache_address *)
322 get_callout_cache_record(dbm_file,
323 address_key, US"address",
324 callout_cache_positive_expire,
325 callout_cache_negative_expire);
326
327 if (cache_address_record != NULL)
328 {
329 if (cache_address_record->result == ccache_accept)
330 {
331 HDEBUG(D_verify)
332 debug_printf("callout cache: address record is positive\n");
333 }
334 else
335 {
336 HDEBUG(D_verify)
337 debug_printf("callout cache: address record is negative\n");
338 addr->user_message = US"Previous (cached) callout verification failure";
8e669ac1 339 *failure_ptr = US"recipient";
059ec3d9
PH
340 yield = FAIL;
341 }
342 goto END_CALLOUT;
343 }
344
345 /* Close the cache database while we actually do the callout for real. */
346
347 END_CACHE:
348 dbfn_close(dbm_file);
349 dbm_file = NULL;
350 }
351
352/* The information wasn't available in the cache, so we have to do a real
353callout and save the result in the cache for next time, unless no_cache is set,
354or unless we have a previously cached negative random result. If we are to test
355with a random local part, ensure that such a local part is available. If not,
356log the fact, but carry on without randomming. */
357
358if (callout_random && callout_random_local_part != NULL)
359 {
360 random_local_part = expand_string(callout_random_local_part);
361 if (random_local_part == NULL)
362 log_write(0, LOG_MAIN|LOG_PANIC, "failed to expand "
363 "callout_random_local_part: %s", expand_string_message);
364 }
365
4deaf07d
PH
366/* Default the connect and overall callout timeouts if not set, and record the
367time we are starting so that we can enforce it. */
059ec3d9
PH
368
369if (callout_overall < 0) callout_overall = 4 * callout;
4deaf07d 370if (callout_connect < 0) callout_connect = callout;
059ec3d9
PH
371callout_start_time = time(NULL);
372
373/* Now make connections to the hosts and do real callouts. The list of hosts
374is passed in as an argument. */
375
376for (host = host_list; host != NULL && !done; host = host->next)
377 {
378 smtp_inblock inblock;
379 smtp_outblock outblock;
380 int host_af;
381 int port = 25;
8e669ac1 382 BOOL send_quit = TRUE;
059ec3d9
PH
383 uschar *helo = US"HELO";
384 uschar *interface = NULL; /* Outgoing interface to use; NULL => any */
385 uschar inbuffer[4096];
386 uschar outbuffer[1024];
387 uschar responsebuffer[4096];
388
389 clearflag(addr, af_verify_pmfail); /* postmaster callout flag */
390 clearflag(addr, af_verify_nsfail); /* null sender callout flag */
391
392 /* Skip this host if we don't have an IP address for it. */
393
394 if (host->address == NULL)
395 {
396 DEBUG(D_verify) debug_printf("no IP address for host name %s: skipping\n",
397 host->name);
398 continue;
399 }
400
401 /* Check the overall callout timeout */
402
403 if (time(NULL) - callout_start_time >= callout_overall)
404 {
405 HDEBUG(D_verify) debug_printf("overall timeout for callout exceeded\n");
406 break;
407 }
408
409 /* Set IPv4 or IPv6 */
410
411 host_af = (Ustrchr(host->address, ':') == NULL)? AF_INET:AF_INET6;
412
de3a88fb
PH
413 /* Expand and interpret the interface and port strings. The latter will not
414 be used if there is a host-specific port (e.g. from a manualroute router).
415 This has to be delayed till now, because they may expand differently for
416 different hosts. If there's a failure, log it, but carry on with the
417 defaults. */
059ec3d9
PH
418
419 deliver_host = host->name;
420 deliver_host_address = host->address;
750af86e 421 deliver_domain = addr->domain;
de3a88fb 422
059ec3d9
PH
423 if (!smtp_get_interface(tf->interface, host_af, addr, NULL, &interface,
424 US"callout") ||
425 !smtp_get_port(tf->port, addr, &port, US"callout"))
426 log_write(0, LOG_MAIN|LOG_PANIC, "<%s>: %s", addr->address,
427 addr->message);
de3a88fb 428
059ec3d9 429 deliver_host = deliver_host_address = NULL;
750af86e 430 deliver_domain = save_deliver_domain;
059ec3d9
PH
431
432 /* Set HELO string according to the protocol */
433
434 if (Ustrcmp(tf->protocol, "lmtp") == 0) helo = US"LHLO";
435
436 HDEBUG(D_verify) debug_printf("interface=%s port=%d\n", interface, port);
437
438 /* Set up the buffer for reading SMTP response packets. */
439
440 inblock.buffer = inbuffer;
441 inblock.buffersize = sizeof(inbuffer);
442 inblock.ptr = inbuffer;
443 inblock.ptrend = inbuffer;
444
445 /* Set up the buffer for holding SMTP commands while pipelining */
446
447 outblock.buffer = outbuffer;
448 outblock.buffersize = sizeof(outbuffer);
449 outblock.ptr = outbuffer;
450 outblock.cmd_count = 0;
451 outblock.authenticating = FALSE;
452
453 /* Connect to the host; on failure, just loop for the next one, but we
4deaf07d 454 set the error for the last one. Use the callout_connect timeout. */
059ec3d9
PH
455
456 inblock.sock = outblock.sock =
4deaf07d 457 smtp_connect(host, host_af, port, interface, callout_connect, TRUE);
059ec3d9
PH
458 if (inblock.sock < 0)
459 {
460 addr->message = string_sprintf("could not connect to %s [%s]: %s",
461 host->name, host->address, strerror(errno));
462 continue;
463 }
464
465 /* Wait for initial response, and then run the initial SMTP commands. The
466 smtp_write_command() function leaves its command in big_buffer. This is
467 used in error responses. Initialize it in case the connection is
468 rejected. */
469
470 Ustrcpy(big_buffer, "initial connection");
471
472 done =
473 smtp_read_response(&inblock, responsebuffer, sizeof(responsebuffer),
474 '2', callout) &&
475
476 smtp_write_command(&outblock, FALSE, "%s %s\r\n", helo,
477 smtp_active_hostname) >= 0 &&
478 smtp_read_response(&inblock, responsebuffer, sizeof(responsebuffer),
479 '2', callout) &&
480
481 smtp_write_command(&outblock, FALSE, "MAIL FROM:<%s>\r\n",
482 from_address) >= 0 &&
483 smtp_read_response(&inblock, responsebuffer, sizeof(responsebuffer),
484 '2', callout);
485
486 /* If the host gave an initial error, or does not accept HELO or MAIL
487 FROM:<>, arrange to cache this information, but don't record anything for an
488 I/O error or a defer. Do not cache rejections when a non-empty sender has
489 been used, because that blocks the whole domain for all senders. */
490
491 if (!done)
492 {
8e669ac1 493 *failure_ptr = US"mail";
059ec3d9
PH
494 if (errno == 0 && responsebuffer[0] == '5')
495 {
496 setflag(addr, af_verify_nsfail);
497 if (from_address[0] == 0) new_domain_record.result = ccache_reject;
498 }
499 }
500
501 /* Otherwise, proceed to check a "random" address (if required), then the
502 given address, and the postmaster address (if required). Between each check,
503 issue RSET, because some servers accept only one recipient after MAIL
504 FROM:<>. */
505
506 else
507 {
508 new_domain_record.result = ccache_accept;
509
510 /* Do the random local part check first */
511
512 if (random_local_part != NULL)
513 {
514 uschar randombuffer[1024];
515 BOOL random_ok =
516 smtp_write_command(&outblock, FALSE,
517 "RCPT TO:<%.1000s@%.1000s>\r\n", random_local_part,
518 addr->domain) >= 0 &&
519 smtp_read_response(&inblock, randombuffer,
520 sizeof(randombuffer), '2', callout);
521
522 /* Remember when we last did a random test */
523
524 new_domain_record.random_stamp = time(NULL);
525
526 /* If accepted, we aren't going to do any further tests below. */
527
528 if (random_ok)
529 {
530 new_domain_record.random_result = ccache_accept;
531 }
532
533 /* Otherwise, cache a real negative response, and get back to the right
534 state to send RCPT. Unless there's some problem such as a dropped
535 connection, we expect to succeed, because the commands succeeded above. */
536
537 else if (errno == 0)
538 {
539 if (randombuffer[0] == '5')
540 new_domain_record.random_result = ccache_reject;
541
542 done =
543 smtp_write_command(&outblock, FALSE, "RSET\r\n") >= 0 &&
544 smtp_read_response(&inblock, responsebuffer, sizeof(responsebuffer),
545 '2', callout) &&
546
90e9ce59
PH
547 smtp_write_command(&outblock, FALSE, "MAIL FROM:<%s>\r\n",
548 from_address) >= 0 &&
059ec3d9
PH
549 smtp_read_response(&inblock, responsebuffer, sizeof(responsebuffer),
550 '2', callout);
551 }
552 else done = FALSE; /* Some timeout/connection problem */
553 } /* Random check */
554
555 /* If the host is accepting all local parts, as determined by the "random"
556 check, we don't need to waste time doing any further checking. */
557
558 if (new_domain_record.random_result != ccache_accept && done)
559 {
5417f6d1
PH
560 /* Get the rcpt_include_affixes flag from the transport if there is one,
561 but assume FALSE if there is not. */
562
059ec3d9
PH
563 done =
564 smtp_write_command(&outblock, FALSE, "RCPT TO:<%.1000s>\r\n",
c688b954 565 transport_rcpt_address(addr,
5417f6d1
PH
566 (addr->transport == NULL)? FALSE :
567 addr->transport->rcpt_include_affixes)) >= 0 &&
059ec3d9
PH
568 smtp_read_response(&inblock, responsebuffer, sizeof(responsebuffer),
569 '2', callout);
570
571 if (done)
572 new_address_record.result = ccache_accept;
573 else if (errno == 0 && responsebuffer[0] == '5')
2c7db3f5 574 {
8e669ac1 575 *failure_ptr = US"recipient";
059ec3d9 576 new_address_record.result = ccache_reject;
8e669ac1 577 }
059ec3d9 578
2a4be8f9
PH
579 /* Do postmaster check if requested; if a full check is required, we
580 check for RCPT TO:<postmaster> (no domain) in accordance with RFC 821. */
059ec3d9
PH
581
582 if (done && pm_mailfrom != NULL)
583 {
584 done =
585 smtp_write_command(&outblock, FALSE, "RSET\r\n") >= 0 &&
586 smtp_read_response(&inblock, responsebuffer,
587 sizeof(responsebuffer), '2', callout) &&
588
589 smtp_write_command(&outblock, FALSE,
590 "MAIL FROM:<%s>\r\n", pm_mailfrom) >= 0 &&
591 smtp_read_response(&inblock, responsebuffer,
592 sizeof(responsebuffer), '2', callout) &&
593
2a4be8f9
PH
594 /* First try using the current domain */
595
596 ((
059ec3d9
PH
597 smtp_write_command(&outblock, FALSE,
598 "RCPT TO:<postmaster@%.1000s>\r\n", addr->domain) >= 0 &&
599 smtp_read_response(&inblock, responsebuffer,
2a4be8f9
PH
600 sizeof(responsebuffer), '2', callout)
601 )
602
603 ||
604
605 /* If that doesn't work, and a full check is requested,
606 try without the domain. */
607
608 (
609 (options & vopt_callout_fullpm) != 0 &&
610 smtp_write_command(&outblock, FALSE,
611 "RCPT TO:<postmaster>\r\n") >= 0 &&
612 smtp_read_response(&inblock, responsebuffer,
613 sizeof(responsebuffer), '2', callout)
614 ));
615
616 /* Sort out the cache record */
059ec3d9
PH
617
618 new_domain_record.postmaster_stamp = time(NULL);
619
620 if (done)
621 new_domain_record.postmaster_result = ccache_accept;
622 else if (errno == 0 && responsebuffer[0] == '5')
623 {
8e669ac1 624 *failure_ptr = US"postmaster";
059ec3d9
PH
625 setflag(addr, af_verify_pmfail);
626 new_domain_record.postmaster_result = ccache_reject;
627 }
628 }
629 } /* Random not accepted */
90e9ce59 630 } /* MAIL FROM: accepted */
059ec3d9
PH
631
632 /* For any failure of the main check, other than a negative response, we just
633 close the connection and carry on. We can identify a negative response by the
634 fact that errno is zero. For I/O errors it will be non-zero
635
636 Set up different error texts for logging and for sending back to the caller
637 as an SMTP response. Log in all cases, using a one-line format. For sender
638 callouts, give a full response to the caller, but for recipient callouts,
639 don't give the IP address because this may be an internal host whose identity
640 is not to be widely broadcast. */
641
642 if (!done)
643 {
644 if (errno == ETIMEDOUT)
645 {
646 HDEBUG(D_verify) debug_printf("SMTP timeout\n");
8e669ac1 647 send_quit = FALSE;
059ec3d9
PH
648 }
649 else if (errno == 0)
650 {
651 if (*responsebuffer == 0) Ustrcpy(responsebuffer, US"connection dropped");
652
653 addr->message =
654 string_sprintf("response to \"%s\" from %s [%s] was: %s",
655 big_buffer, host->name, host->address,
656 string_printing(responsebuffer));
657
658 addr->user_message = is_recipient?
659 string_sprintf("Callout verification failed:\n%s", responsebuffer)
660 :
661 string_sprintf("Called: %s\nSent: %s\nResponse: %s",
662 host->address, big_buffer, responsebuffer);
663
664 /* Hard rejection ends the process */
665
666 if (responsebuffer[0] == '5') /* Address rejected */
667 {
668 yield = FAIL;
669 done = TRUE;
670 }
671 }
672 }
673
674 /* End the SMTP conversation and close the connection. */
675
c9bdd01c 676 if (send_quit) (void)smtp_write_command(&outblock, FALSE, "QUIT\r\n");
f1e894f3 677 (void)close(inblock.sock);
059ec3d9
PH
678 } /* Loop through all hosts, while !done */
679
680/* If we get here with done == TRUE, a successful callout happened, and yield
681will be set OK or FAIL according to the response to the RCPT command.
682Otherwise, we looped through the hosts but couldn't complete the business.
683However, there may be domain-specific information to cache in both cases.
684
685The value of the result field in the new_domain record is ccache_unknown if
90e9ce59 686there was an error before or with MAIL FROM:, and errno was not zero,
059ec3d9
PH
687implying some kind of I/O error. We don't want to write the cache in that case.
688Otherwise the value is ccache_accept or ccache_reject. */
689
690if (!callout_no_cache && new_domain_record.result != ccache_unknown)
691 {
692 if ((dbm_file = dbfn_open(US"callout", O_RDWR|O_CREAT, &dbblock, FALSE))
693 == NULL)
694 {
695 HDEBUG(D_verify) debug_printf("callout cache: not available\n");
696 }
697 else
698 {
699 (void)dbfn_write(dbm_file, addr->domain, &new_domain_record,
700 (int)sizeof(dbdata_callout_cache));
701 HDEBUG(D_verify) debug_printf("wrote callout cache domain record:\n"
702 " result=%d postmaster=%d random=%d\n",
703 new_domain_record.result,
704 new_domain_record.postmaster_result,
705 new_domain_record.random_result);
706 }
707 }
708
709/* If a definite result was obtained for the callout, cache it unless caching
710is disabled. */
711
712if (done)
713 {
714 if (!callout_no_cache && new_address_record.result != ccache_unknown)
715 {
716 if (dbm_file == NULL)
717 dbm_file = dbfn_open(US"callout", O_RDWR|O_CREAT, &dbblock, FALSE);
718 if (dbm_file == NULL)
719 {
720 HDEBUG(D_verify) debug_printf("no callout cache available\n");
721 }
722 else
723 {
724 (void)dbfn_write(dbm_file, address_key, &new_address_record,
725 (int)sizeof(dbdata_callout_cache_address));
726 HDEBUG(D_verify) debug_printf("wrote %s callout cache address record\n",
727 (new_address_record.result == ccache_accept)? "positive" : "negative");
728 }
729 }
730 } /* done */
731
732/* Failure to connect to any host, or any response other than 2xx or 5xx is a
733temporary error. If there was only one host, and a response was received, leave
734it alone if supplying details. Otherwise, give a generic response. */
735
736else /* !done */
737 {
738 uschar *dullmsg = string_sprintf("Could not complete %s verify callout",
739 is_recipient? "recipient" : "sender");
740 yield = DEFER;
741
742 if (host_list->next != NULL || addr->message == NULL) addr->message = dullmsg;
743
744 addr->user_message = (!smtp_return_error_details)? dullmsg :
745 string_sprintf("%s for <%s>.\n"
746 "The mail server(s) for the domain may be temporarily unreachable, or\n"
747 "they may be permanently unreachable from this server. In the latter case,\n%s",
748 dullmsg, addr->address,
749 is_recipient?
750 "the address will never be accepted."
751 :
752 "you need to change the address or create an MX record for its domain\n"
753 "if it is supposed to be generally accessible from the Internet.\n"
754 "Talk to your mail administrator for details.");
755
756 /* Force a specific error code */
757
758 addr->basic_errno = ERRNO_CALLOUTDEFER;
759 }
760
761/* Come here from within the cache-reading code on fast-track exit. */
762
763END_CALLOUT:
764if (dbm_file != NULL) dbfn_close(dbm_file);
765return yield;
766}
767
768
769
770/*************************************************
771* Copy error to toplevel address *
772*************************************************/
773
774/* This function is used when a verify fails or defers, to ensure that the
775failure or defer information is in the original toplevel address. This applies
776when an address is redirected to a single new address, and the failure or
777deferral happens to the child address.
778
779Arguments:
780 vaddr the verify address item
781 addr the final address item
782 yield FAIL or DEFER
783
784Returns: the value of YIELD
785*/
786
787static int
788copy_error(address_item *vaddr, address_item *addr, int yield)
789{
790if (addr != vaddr)
791 {
792 vaddr->message = addr->message;
793 vaddr->user_message = addr->user_message;
794 vaddr->basic_errno = addr->basic_errno;
795 vaddr->more_errno = addr->more_errno;
796 }
797return yield;
798}
799
800
801
802
803/*************************************************
804* Verify an email address *
805*************************************************/
806
807/* This function is used both for verification (-bv and at other times) and
808address testing (-bt), which is indicated by address_test_mode being set.
809
810Arguments:
811 vaddr contains the address to verify; the next field in this block
812 must be NULL
813 f if not NULL, write the result to this file
814 options various option bits:
815 vopt_fake_sender => this sender verify is not for the real
816 sender (it was verify=sender=xxxx or an address from a
817 header line) - rewriting must not change sender_address
818 vopt_is_recipient => this is a recipient address, otherwise
819 it's a sender address - this affects qualification and
820 rewriting and messages from callouts
821 vopt_qualify => qualify an unqualified address; else error
822 vopt_expn => called from SMTP EXPN command
eafd343b
TK
823 vopt_success_on_redirect => when a new address is generated
824 the verification instantly succeeds
059ec3d9
PH
825
826 These ones are used by do_callout() -- the options variable
827 is passed to it.
828
2a4be8f9 829 vopt_callout_fullpm => if postmaster check, do full one
059ec3d9
PH
830 vopt_callout_no_cache => don't use callout cache
831 vopt_callout_random => do the "random" thing
832 vopt_callout_recipsender => use real sender for recipient
833 vopt_callout_recippmaster => use postmaster for recipient
834
835 callout if > 0, specifies that callout is required, and gives timeout
4deaf07d 836 for individual commands
059ec3d9
PH
837 callout_overall if > 0, gives overall timeout for the callout function;
838 if < 0, a default is used (see do_callout())
8e669ac1 839 callout_connect the connection timeout for callouts
059ec3d9
PH
840 se_mailfrom when callout is requested to verify a sender, use this
841 in MAIL FROM; NULL => ""
842 pm_mailfrom when callout is requested, if non-NULL, do the postmaster
843 thing and use this as the sender address (may be "")
844
845 routed if not NULL, set TRUE if routing succeeded, so we can
846 distinguish between routing failed and callout failed
847
848Returns: OK address verified
849 FAIL address failed to verify
850 DEFER can't tell at present
851*/
852
853int
854verify_address(address_item *vaddr, FILE *f, int options, int callout,
8e669ac1 855 int callout_overall, int callout_connect, uschar *se_mailfrom,
4deaf07d 856 uschar *pm_mailfrom, BOOL *routed)
059ec3d9
PH
857{
858BOOL allok = TRUE;
859BOOL full_info = (f == NULL)? FALSE : (debug_selector != 0);
860BOOL is_recipient = (options & vopt_is_recipient) != 0;
861BOOL expn = (options & vopt_expn) != 0;
eafd343b 862BOOL success_on_redirect = (options & vopt_success_on_redirect) != 0;
059ec3d9
PH
863int i;
864int yield = OK;
865int verify_type = expn? v_expn :
866 address_test_mode? v_none :
867 is_recipient? v_recipient : v_sender;
868address_item *addr_list;
869address_item *addr_new = NULL;
870address_item *addr_remote = NULL;
871address_item *addr_local = NULL;
872address_item *addr_succeed = NULL;
8e669ac1 873uschar **failure_ptr = is_recipient?
2c7db3f5 874 &recipient_verify_failure : &sender_verify_failure;
059ec3d9
PH
875uschar *ko_prefix, *cr;
876uschar *address = vaddr->address;
877uschar *save_sender;
878uschar null_sender[] = { 0 }; /* Ensure writeable memory */
879
2c7db3f5
PH
880/* Clear, just in case */
881
882*failure_ptr = NULL;
883
059ec3d9
PH
884/* Set up a prefix and suffix for error message which allow us to use the same
885output statements both in EXPN mode (where an SMTP response is needed) and when
886debugging with an output file. */
887
888if (expn)
889 {
890 ko_prefix = US"553 ";
891 cr = US"\r";
892 }
893else ko_prefix = cr = US"";
894
895/* Add qualify domain if permitted; otherwise an unqualified address fails. */
896
897if (parse_find_at(address) == NULL)
898 {
899 if ((options & vopt_qualify) == 0)
900 {
901 if (f != NULL)
902 fprintf(f, "%sA domain is required for \"%s\"%s\n", ko_prefix, address,
903 cr);
8e669ac1 904 *failure_ptr = US"qualify";
059ec3d9
PH
905 return FAIL;
906 }
907 address = rewrite_address_qualify(address, is_recipient);
908 }
909
910DEBUG(D_verify)
911 {
912 debug_printf(">>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>\n");
913 debug_printf("%s %s\n", address_test_mode? "Testing" : "Verifying", address);
914 }
915
916/* Rewrite and report on it. Clear the domain and local part caches - these
917may have been set by domains and local part tests during an ACL. */
918
919if (global_rewrite_rules != NULL)
920 {
921 uschar *old = address;
922 address = rewrite_address(address, is_recipient, FALSE,
923 global_rewrite_rules, rewrite_existflags);
924 if (address != old)
925 {
926 for (i = 0; i < (MAX_NAMED_LIST * 2)/32; i++) vaddr->localpart_cache[i] = 0;
927 for (i = 0; i < (MAX_NAMED_LIST * 2)/32; i++) vaddr->domain_cache[i] = 0;
928 if (f != NULL && !expn) fprintf(f, "Address rewritten as: %s\n", address);
929 }
930 }
931
932/* If this is the real sender address, we must update sender_address at
933this point, because it may be referred to in the routers. */
934
935if ((options & (vopt_fake_sender|vopt_is_recipient)) == 0)
936 sender_address = address;
937
938/* If the address was rewritten to <> no verification can be done, and we have
939to return OK. This rewriting is permitted only for sender addresses; for other
940addresses, such rewriting fails. */
941
942if (address[0] == 0) return OK;
943
944/* Save a copy of the sender address for re-instating if we change it to <>
945while verifying a sender address (a nice bit of self-reference there). */
946
947save_sender = sender_address;
948
949/* Update the address structure with the possibly qualified and rewritten
950address. Set it up as the starting address on the chain of new addresses. */
951
952vaddr->address = address;
953addr_new = vaddr;
954
955/* We need a loop, because an address can generate new addresses. We must also
956cope with generated pipes and files at the top level. (See also the code and
957comment in deliver.c.) However, it is usually the case that the router for
958user's .forward files has its verify flag turned off.
959
960If an address generates more than one child, the loop is used only when
961full_info is set, and this can only be set locally. Remote enquiries just get
962information about the top level address, not anything that it generated. */
963
964while (addr_new != NULL)
965 {
966 int rc;
967 address_item *addr = addr_new;
968
969 addr_new = addr->next;
970 addr->next = NULL;
971
972 DEBUG(D_verify)
973 {
974 debug_printf(">>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>\n");
975 debug_printf("Considering %s\n", addr->address);
976 }
977
978 /* Handle generated pipe, file or reply addresses. We don't get these
979 when handling EXPN, as it does only one level of expansion. */
980
981 if (testflag(addr, af_pfr))
982 {
983 allok = FALSE;
984 if (f != NULL)
985 {
986 BOOL allow;
987
988 if (addr->address[0] == '>')
989 {
990 allow = testflag(addr, af_allow_reply);
991 fprintf(f, "%s -> mail %s", addr->parent->address, addr->address + 1);
992 }
993 else
994 {
995 allow = (addr->address[0] == '|')?
996 testflag(addr, af_allow_pipe) : testflag(addr, af_allow_file);
997 fprintf(f, "%s -> %s", addr->parent->address, addr->address);
998 }
999
1000 if (addr->basic_errno == ERRNO_BADTRANSPORT)
1001 fprintf(f, "\n*** Error in setting up pipe, file, or autoreply:\n"
1002 "%s\n", addr->message);
1003 else if (allow)
1004 fprintf(f, "\n transport = %s\n", addr->transport->name);
1005 else
1006 fprintf(f, " *** forbidden ***\n");
1007 }
1008 continue;
1009 }
1010
1011 /* Just in case some router parameter refers to it. */
1012
1013 return_path = (addr->p.errors_address != NULL)?
1014 addr->p.errors_address : sender_address;
1015
1016 /* Split the address into domain and local part, handling the %-hack if
1017 necessary, and then route it. While routing a sender address, set
1018 $sender_address to <> because that is what it will be if we were trying to
1019 send a bounce to the sender. */
1020
1021 if (routed != NULL) *routed = FALSE;
1022 if ((rc = deliver_split_address(addr)) == OK)
1023 {
1024 if (!is_recipient) sender_address = null_sender;
1025 rc = route_address(addr, &addr_local, &addr_remote, &addr_new,
1026 &addr_succeed, verify_type);
1027 sender_address = save_sender; /* Put back the real sender */
1028 }
1029
1030 /* If routing an address succeeded, set the flag that remembers, for use when
1031 an ACL cached a sender verify (in case a callout fails). Then if routing set
1032 up a list of hosts or the transport has a host list, and the callout option
1033 is set, and we aren't in a host checking run, do the callout verification,
1034 and set another flag that notes that a callout happened. */
1035
1036 if (rc == OK)
1037 {
1038 if (routed != NULL) *routed = TRUE;
1039 if (callout > 0)
1040 {
1041 host_item *host_list = addr->host_list;
1042
1043 /* Default, if no remote transport, to NULL for the interface (=> any),
1044 "smtp" for the port, and "smtp" for the protocol. */
1045
1046 transport_feedback tf = { NULL, US"smtp", US"smtp", NULL, FALSE, FALSE };
1047
1048 /* If verification yielded a remote transport, we want to use that
1049 transport's options, so as to mimic what would happen if we were really
1050 sending a message to this address. */
1051
1052 if (addr->transport != NULL && !addr->transport->info->local)
1053 {
1054 (void)(addr->transport->setup)(addr->transport, addr, &tf, NULL);
1055
1056 /* If the transport has hosts and the router does not, or if the
1057 transport is configured to override the router's hosts, we must build a
1058 host list of the transport's hosts, and find the IP addresses */
1059
1060 if (tf.hosts != NULL && (host_list == NULL || tf.hosts_override))
1061 {
1062 uschar *s;
750af86e
PH
1063 uschar *save_deliver_domain = deliver_domain;
1064 uschar *save_deliver_localpart = deliver_localpart;
059ec3d9
PH
1065
1066 host_list = NULL; /* Ignore the router's hosts */
1067
1068 deliver_domain = addr->domain;
1069 deliver_localpart = addr->local_part;
1070 s = expand_string(tf.hosts);
750af86e
PH
1071 deliver_domain = save_deliver_domain;
1072 deliver_localpart = save_deliver_localpart;
059ec3d9
PH
1073
1074 if (s == NULL)
1075 {
1076 log_write(0, LOG_MAIN|LOG_PANIC, "failed to expand list of hosts "
1077 "\"%s\" in %s transport for callout: %s", tf.hosts,
1078 addr->transport->name, expand_string_message);
1079 }
1080 else
1081 {
1082 uschar *canonical_name;
d8ef3577 1083 host_item *host, *nexthost;
059ec3d9
PH
1084 host_build_hostlist(&host_list, s, tf.hosts_randomize);
1085
1086 /* Just ignore failures to find a host address. If we don't manage
8e669ac1
PH
1087 to find any addresses, the callout will defer. Note that more than
1088 one address may be found for a single host, which will result in
1089 additional host items being inserted into the chain. Hence we must
d8ef3577 1090 save the next host first. */
059ec3d9 1091
d8ef3577 1092 for (host = host_list; host != NULL; host = nexthost)
059ec3d9 1093 {
d8ef3577 1094 nexthost = host->next;
8e669ac1 1095 if (tf.gethostbyname ||
a5a28604 1096 string_is_ip_address(host->name, NULL) > 0)
059ec3d9
PH
1097 (void)host_find_byname(host, NULL, &canonical_name, TRUE);
1098 else
1099 {
1100 int flags = HOST_FIND_BY_A;
1101 if (tf.qualify_single) flags |= HOST_FIND_QUALIFY_SINGLE;
1102 if (tf.search_parents) flags |= HOST_FIND_SEARCH_PARENTS;
1103 (void)host_find_bydns(host, NULL, flags, NULL, NULL, NULL,
1104 &canonical_name, NULL);
1105 }
1106 }
1107 }
1108 }
1109 }
1110
8e669ac1 1111 /* Can only do a callout if we have at least one host! If the callout
2c7db3f5 1112 fails, it will have set ${sender,recipient}_verify_failure. */
059ec3d9
PH
1113
1114 if (host_list != NULL)
1115 {
1116 HDEBUG(D_verify) debug_printf("Attempting full verification using callout\n");
1117 if (host_checking && !host_checking_callout)
1118 {
1119 HDEBUG(D_verify)
1120 debug_printf("... callout omitted by default when host testing\n"
1121 "(Use -bhc if you want the callouts to happen.)\n");
1122 }
1123 else
1124 {
1125 rc = do_callout(addr, host_list, &tf, callout, callout_overall,
4deaf07d 1126 callout_connect, options, se_mailfrom, pm_mailfrom);
059ec3d9
PH
1127 }
1128 }
1129 else
1130 {
1131 HDEBUG(D_verify) debug_printf("Cannot do callout: neither router nor "
1132 "transport provided a host list\n");
1133 }
1134 }
1135 }
8e669ac1 1136
2c7db3f5 1137 /* Otherwise, any failure is a routing failure */
8e669ac1
PH
1138
1139 else *failure_ptr = US"route";
059ec3d9
PH
1140
1141 /* A router may return REROUTED if it has set up a child address as a result
1142 of a change of domain name (typically from widening). In this case we always
1143 want to continue to verify the new child. */
1144
1145 if (rc == REROUTED) continue;
8e669ac1 1146
059ec3d9
PH
1147 /* Handle hard failures */
1148
1149 if (rc == FAIL)
1150 {
1151 allok = FALSE;
1152 if (f != NULL)
1153 {
1154 fprintf(f, "%s%s %s", ko_prefix, address,
1155 address_test_mode? "is undeliverable" : "failed to verify");
1156 if (!expn && admin_user)
1157 {
1158 if (addr->basic_errno > 0)
1159 fprintf(f, ": %s", strerror(addr->basic_errno));
1160 if (addr->message != NULL)
1161 fprintf(f, ":\n %s", addr->message);
1162 }
1163 fprintf(f, "%s\n", cr);
1164 }
1165
1166 if (!full_info) return copy_error(vaddr, addr, FAIL);
1167 else yield = FAIL;
1168 }
1169
1170 /* Soft failure */
1171
1172 else if (rc == DEFER)
1173 {
1174 allok = FALSE;
1175 if (f != NULL)
1176 {
1177 fprintf(f, "%s%s cannot be resolved at this time", ko_prefix, address);
1178 if (!expn && admin_user)
1179 {
1180 if (addr->basic_errno > 0)
1181 fprintf(f, ":\n %s", strerror(addr->basic_errno));
1182 if (addr->message != NULL)
1183 fprintf(f, ":\n %s", addr->message);
1184 else if (addr->basic_errno <= 0)
1185 fprintf(f, ":\n unknown error");
1186 }
1187
1188 fprintf(f, "%s\n", cr);
1189 }
1190 if (!full_info) return copy_error(vaddr, addr, DEFER);
1191 else if (yield == OK) yield = DEFER;
1192 }
1193
1194 /* If we are handling EXPN, we do not want to continue to route beyond
1195 the top level. */
1196
1197 else if (expn)
1198 {
1199 uschar *ok_prefix = US"250-";
1200 if (addr_new == NULL)
1201 {
1202 if (addr_local == NULL && addr_remote == NULL)
1203 fprintf(f, "250 mail to <%s> is discarded\r\n", address);
1204 else
1205 fprintf(f, "250 <%s>\r\n", address);
1206 }
1207 else while (addr_new != NULL)
1208 {
1209 address_item *addr2 = addr_new;
1210 addr_new = addr2->next;
1211 if (addr_new == NULL) ok_prefix = US"250 ";
1212 fprintf(f, "%s<%s>\r\n", ok_prefix, addr2->address);
1213 }
1214 return OK;
1215 }
1216
1217 /* Successful routing other than EXPN. */
1218
1219 else
1220 {
1221 /* Handle successful routing when short info wanted. Otherwise continue for
1222 other (generated) addresses. Short info is the operational case. Full info
1223 can be requested only when debug_selector != 0 and a file is supplied.
1224
1225 There is a conflict between the use of aliasing as an alternate email
1226 address, and as a sort of mailing list. If an alias turns the incoming
1227 address into just one address (e.g. J.Caesar->jc44) you may well want to
1228 carry on verifying the generated address to ensure it is valid when
1229 checking incoming mail. If aliasing generates multiple addresses, you
1230 probably don't want to do this. Exim therefore treats the generation of
1231 just a single new address as a special case, and continues on to verify the
1232 generated address. */
1233
1234 if (!full_info && /* Stop if short info wanted AND */
eafd343b
TK
1235 (((addr_new == NULL || /* No new address OR */
1236 addr_new->next != NULL || /* More than one new address OR */
1237 testflag(addr_new, af_pfr))) /* New address is pfr */
1238 || /* OR */
1239 (addr_new != NULL && /* At least one new address AND */
1240 success_on_redirect))) /* success_on_redirect is set */
059ec3d9
PH
1241 {
1242 if (f != NULL) fprintf(f, "%s %s\n", address,
1243 address_test_mode? "is deliverable" : "verified");
1244
1245 /* If we have carried on to verify a child address, we want the value
1246 of $address_data to be that of the child */
1247
1248 vaddr->p.address_data = addr->p.address_data;
1249 return OK;
1250 }
1251 }
1252 } /* Loop for generated addresses */
1253
1254/* Display the full results of the successful routing, including any generated
1255addresses. Control gets here only when full_info is set, which requires f not
1256to be NULL, and this occurs only when a top-level verify is called with the
1257debugging switch on.
1258
1259If there are no local and no remote addresses, and there were no pipes, files,
1260or autoreplies, and there were no errors or deferments, the message is to be
1261discarded, usually because of the use of :blackhole: in an alias file. */
1262
1263if (allok && addr_local == NULL && addr_remote == NULL)
1264 fprintf(f, "mail to %s is discarded\n", address);
1265
1266else for (addr_list = addr_local, i = 0; i < 2; addr_list = addr_remote, i++)
1267 {
1268 while (addr_list != NULL)
1269 {
1270 address_item *addr = addr_list;
1271 address_item *p = addr->parent;
1272 addr_list = addr->next;
1273
1274 fprintf(f, "%s", CS addr->address);
384152a6
TK
1275#ifdef EXPERIMENTAL_SRS
1276 if(addr->p.srs_sender)
1277 fprintf(f, " [srs = %s]", addr->p.srs_sender);
1278#endif
059ec3d9
PH
1279 while (p != NULL)
1280 {
1281 fprintf(f, "\n <-- %s", p->address);
1282 p = p->parent;
1283 }
1284 fprintf(f, "\n ");
1285
1286 /* Show router, and transport */
1287
1288 fprintf(f, "router = %s, ", addr->router->name);
1289 fprintf(f, "transport = %s\n", (addr->transport == NULL)? US"unset" :
1290 addr->transport->name);
1291
1292 /* Show any hosts that are set up by a router unless the transport
1293 is going to override them; fiddle a bit to get a nice format. */
1294
1295 if (addr->host_list != NULL && addr->transport != NULL &&
1296 !addr->transport->overrides_hosts)
1297 {
1298 host_item *h;
1299 int maxlen = 0;
1300 int maxaddlen = 0;
1301 for (h = addr->host_list; h != NULL; h = h->next)
1302 {
1303 int len = Ustrlen(h->name);
1304 if (len > maxlen) maxlen = len;
1305 len = (h->address != NULL)? Ustrlen(h->address) : 7;
1306 if (len > maxaddlen) maxaddlen = len;
1307 }
1308 for (h = addr->host_list; h != NULL; h = h->next)
1309 {
1310 int len = Ustrlen(h->name);
1311 fprintf(f, " host %s ", h->name);
1312 while (len++ < maxlen) fprintf(f, " ");
1313 if (h->address != NULL)
1314 {
1315 fprintf(f, "[%s] ", h->address);
1316 len = Ustrlen(h->address);
1317 }
1318 else if (!addr->transport->info->local) /* Omit [unknown] for local */
1319 {
1320 fprintf(f, "[unknown] ");
1321 len = 7;
1322 }
1323 else len = -3;
1324 while (len++ < maxaddlen) fprintf(f," ");
1325 if (h->mx >= 0) fprintf(f, "MX=%d", h->mx);
1326 if (h->port != PORT_NONE) fprintf(f, " port=%d", h->port);
1327 if (h->status == hstatus_unusable) fprintf(f, " ** unusable **");
1328 fprintf(f, "\n");
1329 }
1330 }
1331 }
1332 }
1333
8e669ac1 1334/* Will be DEFER or FAIL if any one address has, only for full_info (which is
2c7db3f5
PH
1335the -bv or -bt case). */
1336
8e669ac1 1337return yield;
059ec3d9
PH
1338}
1339
1340
1341
1342
1343/*************************************************
1344* Check headers for syntax errors *
1345*************************************************/
1346
1347/* This function checks those header lines that contain addresses, and verifies
1348that all the addresses therein are syntactially correct.
1349
1350Arguments:
1351 msgptr where to put an error message
1352
1353Returns: OK
1354 FAIL
1355*/
1356
1357int
1358verify_check_headers(uschar **msgptr)
1359{
1360header_line *h;
1361uschar *colon, *s;
1362
1363for (h = header_list; h != NULL; h = h->next)
1364 {
1365 if (h->type != htype_from &&
1366 h->type != htype_reply_to &&
1367 h->type != htype_sender &&
1368 h->type != htype_to &&
1369 h->type != htype_cc &&
1370 h->type != htype_bcc)
1371 continue;
1372
1373 colon = Ustrchr(h->text, ':');
1374 s = colon + 1;
1375 while (isspace(*s)) s++;
1376
1377 parse_allow_group = TRUE; /* Allow group syntax */
1378
1379 /* Loop for multiple addresses in the header */
1380
1381 while (*s != 0)
1382 {
1383 uschar *ss = parse_find_address_end(s, FALSE);
1384 uschar *recipient, *errmess;
1385 int terminator = *ss;
1386 int start, end, domain;
1387
1388 /* Temporarily terminate the string at this point, and extract the
1389 operative address within. */
1390
1391 *ss = 0;
1392 recipient = parse_extract_address(s,&errmess,&start,&end,&domain,FALSE);
1393 *ss = terminator;
1394
1395 /* Permit an unqualified address only if the message is local, or if the
1396 sending host is configured to be permitted to send them. */
1397
1398 if (recipient != NULL && domain == 0)
1399 {
1400 if (h->type == htype_from || h->type == htype_sender)
1401 {
1402 if (!allow_unqualified_sender) recipient = NULL;
1403 }
1404 else
1405 {
1406 if (!allow_unqualified_recipient) recipient = NULL;
1407 }
1408 if (recipient == NULL) errmess = US"unqualified address not permitted";
1409 }
1410
1411 /* It's an error if no address could be extracted, except for the special
1412 case of an empty address. */
1413
1414 if (recipient == NULL && Ustrcmp(errmess, "empty address") != 0)
1415 {
1416 uschar *verb = US"is";
1417 uschar *t = ss;
1418 int len;
1419
1420 /* Arrange not to include any white space at the end in the
1421 error message. */
1422
1423 while (t > s && isspace(t[-1])) t--;
1424
1425 /* Add the address which failed to the error message, since in a
1426 header with very many addresses it is sometimes hard to spot
1427 which one is at fault. However, limit the amount of address to
1428 quote - cases have been seen where, for example, a missing double
1429 quote in a humungous To: header creates an "address" that is longer
1430 than string_sprintf can handle. */
1431
1432 len = t - s;
1433 if (len > 1024)
1434 {
1435 len = 1024;
1436 verb = US"begins";
1437 }
1438
1439 *msgptr = string_printing(
1440 string_sprintf("%s: failing address in \"%.*s\" header %s: %.*s",
1441 errmess, colon - h->text, h->text, verb, len, s));
1442
1443 return FAIL;
1444 }
1445
1446 /* Advance to the next address */
1447
1448 s = ss + (terminator? 1:0);
1449 while (isspace(*s)) s++;
1450 } /* Next address */
1451 } /* Next header */
1452
1453return OK;
1454}
1455
1456
1457
1c41c9cc
PH
1458/*************************************************
1459* Check for blind recipients *
1460*************************************************/
1461
1462/* This function checks that every (envelope) recipient is mentioned in either
1463the To: or Cc: header lines, thus detecting blind carbon copies.
1464
1465There are two ways of scanning that could be used: either scan the header lines
1466and tick off the recipients, or scan the recipients and check the header lines.
1467The original proposed patch did the former, but I have chosen to do the latter,
1468because (a) it requires no memory and (b) will use fewer resources when there
1469are many addresses in To: and/or Cc: and only one or two envelope recipients.
1470
1471Arguments: none
1472Returns: OK if there are no blind recipients
1473 FAIL if there is at least one blind recipient
1474*/
1475
1476int
1477verify_check_notblind(void)
1478{
1479int i;
1480for (i = 0; i < recipients_count; i++)
1481 {
1482 header_line *h;
1483 BOOL found = FALSE;
1484 uschar *address = recipients_list[i].address;
1485
1486 for (h = header_list; !found && h != NULL; h = h->next)
1487 {
1488 uschar *colon, *s;
1489
1490 if (h->type != htype_to && h->type != htype_cc) continue;
1491
1492 colon = Ustrchr(h->text, ':');
1493 s = colon + 1;
1494 while (isspace(*s)) s++;
1495
1496 parse_allow_group = TRUE; /* Allow group syntax */
1497
1498 /* Loop for multiple addresses in the header */
1499
1500 while (*s != 0)
1501 {
1502 uschar *ss = parse_find_address_end(s, FALSE);
1503 uschar *recipient,*errmess;
1504 int terminator = *ss;
1505 int start, end, domain;
1506
1507 /* Temporarily terminate the string at this point, and extract the
1508 operative address within. */
1509
1510 *ss = 0;
1511 recipient = parse_extract_address(s,&errmess,&start,&end,&domain,FALSE);
1512 *ss = terminator;
1513
1514 /* If we found a valid recipient that has a domain, compare it with the
1515 envelope recipient. Local parts are compared case-sensitively, domains
1516 case-insensitively. By comparing from the start with length "domain", we
1517 include the "@" at the end, which ensures that we are comparing the whole
1518 local part of each address. */
1519
1520 if (recipient != NULL && domain != 0)
1521 {
1522 found = Ustrncmp(recipient, address, domain) == 0 &&
1523 strcmpic(recipient + domain, address + domain) == 0;
1524 if (found) break;
1525 }
1526
1527 /* Advance to the next address */
1528
1529 s = ss + (terminator? 1:0);
1530 while (isspace(*s)) s++;
1531 } /* Next address */
1532 } /* Next header (if found is false) */
1533
1534 if (!found) return FAIL;
1535 } /* Next recipient */
1536
1537return OK;
1538}
1539
1540
059ec3d9
PH
1541
1542/*************************************************
1543* Find if verified sender *
1544*************************************************/
1545
1546/* Usually, just a single address is verified as the sender of the message.
1547However, Exim can be made to verify other addresses as well (often related in
1548some way), and this is useful in some environments. There may therefore be a
1549chain of such addresses that have previously been tested. This function finds
1550whether a given address is on the chain.
1551
1552Arguments: the address to be verified
1553Returns: pointer to an address item, or NULL
1554*/
1555
1556address_item *
1557verify_checked_sender(uschar *sender)
1558{
1559address_item *addr;
1560for (addr = sender_verified_list; addr != NULL; addr = addr->next)
1561 if (Ustrcmp(sender, addr->address) == 0) break;
1562return addr;
1563}
1564
1565
1566
1567
1568
1569/*************************************************
1570* Get valid header address *
1571*************************************************/
1572
1573/* Scan the originator headers of the message, looking for an address that
1574verifies successfully. RFC 822 says:
1575
1576 o The "Sender" field mailbox should be sent notices of
1577 any problems in transport or delivery of the original
1578 messages. If there is no "Sender" field, then the
1579 "From" field mailbox should be used.
1580
1581 o If the "Reply-To" field exists, then the reply should
1582 go to the addresses indicated in that field and not to
1583 the address(es) indicated in the "From" field.
1584
1585So we check a Sender field if there is one, else a Reply_to field, else a From
1586field. As some strange messages may have more than one of these fields,
1587especially if they are resent- fields, check all of them if there is more than
1588one.
1589
1590Arguments:
1591 user_msgptr points to where to put a user error message
1592 log_msgptr points to where to put a log error message
1593 callout timeout for callout check (passed to verify_address())
1594 callout_overall overall callout timeout (ditto)
8e669ac1 1595 callout_connect connect callout timeout (ditto)
059ec3d9
PH
1596 se_mailfrom mailfrom for verify; NULL => ""
1597 pm_mailfrom sender for pm callout check (passed to verify_address())
1598 options callout options (passed to verify_address())
8e669ac1 1599 verrno where to put the address basic_errno
059ec3d9
PH
1600
1601If log_msgptr is set to something without setting user_msgptr, the caller
1602normally uses log_msgptr for both things.
1603
1604Returns: result of the verification attempt: OK, FAIL, or DEFER;
1605 FAIL is given if no appropriate headers are found
1606*/
1607
1608int
1609verify_check_header_address(uschar **user_msgptr, uschar **log_msgptr,
8e669ac1 1610 int callout, int callout_overall, int callout_connect, uschar *se_mailfrom,
fe5b5d0b 1611 uschar *pm_mailfrom, int options, int *verrno)
059ec3d9
PH
1612{
1613static int header_types[] = { htype_sender, htype_reply_to, htype_from };
1614int yield = FAIL;
1615int i;
1616
1617for (i = 0; i < 3; i++)
1618 {
1619 header_line *h;
1620 for (h = header_list; h != NULL; h = h->next)
1621 {
1622 int terminator, new_ok;
1623 uschar *s, *ss, *endname;
1624
1625 if (h->type != header_types[i]) continue;
1626 s = endname = Ustrchr(h->text, ':') + 1;
1627
1628 while (*s != 0)
1629 {
1630 address_item *vaddr;
1631
1632 while (isspace(*s) || *s == ',') s++;
1633 if (*s == 0) break; /* End of header */
1634
1635 ss = parse_find_address_end(s, FALSE);
1636
1637 /* The terminator is a comma or end of header, but there may be white
1638 space preceding it (including newline for the last address). Move back
1639 past any white space so we can check against any cached envelope sender
1640 address verifications. */
1641
1642 while (isspace(ss[-1])) ss--;
1643 terminator = *ss;
1644 *ss = 0;
1645
1646 HDEBUG(D_verify) debug_printf("verifying %.*s header address %s\n",
1647 (int)(endname - h->text), h->text, s);
1648
1649 /* See if we have already verified this address as an envelope sender,
1650 and if so, use the previous answer. */
1651
1652 vaddr = verify_checked_sender(s);
1653
1654 if (vaddr != NULL && /* Previously checked */
1655 (callout <= 0 || /* No callout needed; OR */
1656 vaddr->special_action > 256)) /* Callout was done */
1657 {
1658 new_ok = vaddr->special_action & 255;
1659 HDEBUG(D_verify) debug_printf("previously checked as envelope sender\n");
1660 *ss = terminator; /* Restore shortened string */
1661 }
1662
1663 /* Otherwise we run the verification now. We must restore the shortened
1664 string before running the verification, so the headers are correct, in
1665 case there is any rewriting. */
1666
1667 else
1668 {
1669 int start, end, domain;
1670 uschar *address = parse_extract_address(s, log_msgptr, &start,
1671 &end, &domain, FALSE);
1672
1673 *ss = terminator;
1674
1675 /* If verification failed because of a syntax error, fail this
1676 function, and ensure that the failing address gets added to the error
1677 message. */
1678
1679 if (address == NULL)
1680 {
1681 new_ok = FAIL;
1682 if (*log_msgptr != NULL)
1683 {
1684 while (ss > s && isspace(ss[-1])) ss--;
1685 *log_msgptr = string_sprintf("syntax error in '%.*s' header when "
1686 "scanning for sender: %s in \"%.*s\"",
1687 endname - h->text, h->text, *log_msgptr, ss - s, s);
1688 return FAIL;
1689 }
1690 }
1691
2f6603e1 1692 /* Else go ahead with the sender verification. But it isn't *the*
059ec3d9
PH
1693 sender of the message, so set vopt_fake_sender to stop sender_address
1694 being replaced after rewriting or qualification. */
1695
1696 else
1697 {
1698 vaddr = deliver_make_addr(address, FALSE);
1699 new_ok = verify_address(vaddr, NULL, options | vopt_fake_sender,
8e669ac1 1700 callout, callout_overall, callout_connect, se_mailfrom,
4deaf07d 1701 pm_mailfrom, NULL);
059ec3d9
PH
1702 }
1703 }
1704
1705 /* We now have the result, either newly found, or cached. If we are
1706 giving out error details, set a specific user error. This means that the
1707 last of these will be returned to the user if all three fail. We do not
1708 set a log message - the generic one below will be used. */
1709
fe5b5d0b 1710 if (new_ok != OK)
059ec3d9 1711 {
8e669ac1 1712 *verrno = vaddr->basic_errno;
fe5b5d0b
PH
1713 if (smtp_return_error_details)
1714 {
1715 *user_msgptr = string_sprintf("Rejected after DATA: "
1716 "could not verify \"%.*s\" header address\n%s: %s",
1717 endname - h->text, h->text, vaddr->address, vaddr->message);
1718 }
8e669ac1 1719 }
059ec3d9
PH
1720
1721 /* Success or defer */
1722
1723 if (new_ok == OK) return OK;
1724 if (new_ok == DEFER) yield = DEFER;
1725
1726 /* Move on to any more addresses in the header */
1727
1728 s = ss;
1729 }
1730 }
1731 }
1732
1733if (yield == FAIL && *log_msgptr == NULL)
1734 *log_msgptr = US"there is no valid sender in any header line";
1735
1736if (yield == DEFER && *log_msgptr == NULL)
1737 *log_msgptr = US"all attempts to verify a sender in a header line deferred";
1738
1739return yield;
1740}
1741
1742
1743
1744
1745/*************************************************
1746* Get RFC 1413 identification *
1747*************************************************/
1748
1749/* Attempt to get an id from the sending machine via the RFC 1413 protocol. If
1750the timeout is set to zero, then the query is not done. There may also be lists
1751of hosts and nets which are exempt. To guard against malefactors sending
1752non-printing characters which could, for example, disrupt a message's headers,
1753make sure the string consists of printing characters only.
1754
1755Argument:
1756 port the port to connect to; usually this is IDENT_PORT (113), but when
1757 running in the test harness with -bh a different value is used.
1758
1759Returns: nothing
1760
1761Side effect: any received ident value is put in sender_ident (NULL otherwise)
1762*/
1763
1764void
1765verify_get_ident(int port)
1766{
1767int sock, host_af, qlen;
1768int received_sender_port, received_interface_port, n;
1769uschar *p;
1770uschar buffer[2048];
1771
1772/* Default is no ident. Check whether we want to do an ident check for this
1773host. */
1774
1775sender_ident = NULL;
1776if (rfc1413_query_timeout <= 0 || verify_check_host(&rfc1413_hosts) != OK)
1777 return;
1778
1779DEBUG(D_ident) debug_printf("doing ident callback\n");
1780
1781/* Set up a connection to the ident port of the remote host. Bind the local end
1782to the incoming interface address. If the sender host address is an IPv6
1783address, the incoming interface address will also be IPv6. */
1784
1785host_af = (Ustrchr(sender_host_address, ':') == NULL)? AF_INET : AF_INET6;
1786sock = ip_socket(SOCK_STREAM, host_af);
1787if (sock < 0) return;
1788
1789if (ip_bind(sock, host_af, interface_address, 0) < 0)
1790 {
1791 DEBUG(D_ident) debug_printf("bind socket for ident failed: %s\n",
1792 strerror(errno));
1793 goto END_OFF;
1794 }
1795
1796if (ip_connect(sock, host_af, sender_host_address, port, rfc1413_query_timeout)
1797 < 0)
1798 {
1799 if (errno == ETIMEDOUT && (log_extra_selector & LX_ident_timeout) != 0)
1800 {
1801 log_write(0, LOG_MAIN, "ident connection to %s timed out",
1802 sender_host_address);
1803 }
1804 else
1805 {
1806 DEBUG(D_ident) debug_printf("ident connection to %s failed: %s\n",
1807 sender_host_address, strerror(errno));
1808 }
1809 goto END_OFF;
1810 }
1811
1812/* Construct and send the query. */
1813
1814sprintf(CS buffer, "%d , %d\r\n", sender_host_port, interface_port);
1815qlen = Ustrlen(buffer);
1816if (send(sock, buffer, qlen, 0) < 0)
1817 {
1818 DEBUG(D_ident) debug_printf("ident send failed: %s\n", strerror(errno));
1819 goto END_OFF;
1820 }
1821
1822/* Read a response line. We put it into the rest of the buffer, using several
1823recv() calls if necessary. */
1824
1825p = buffer + qlen;
1826
1827for (;;)
1828 {
1829 uschar *pp;
1830 int count;
1831 int size = sizeof(buffer) - (p - buffer);
1832
1833 if (size <= 0) goto END_OFF; /* Buffer filled without seeing \n. */
1834 count = ip_recv(sock, p, size, rfc1413_query_timeout);
1835 if (count <= 0) goto END_OFF; /* Read error or EOF */
1836
1837 /* Scan what we just read, to see if we have reached the terminating \r\n. Be
1838 generous, and accept a plain \n terminator as well. The only illegal
1839 character is 0. */
1840
1841 for (pp = p; pp < p + count; pp++)
1842 {
1843 if (*pp == 0) goto END_OFF; /* Zero octet not allowed */
1844 if (*pp == '\n')
1845 {
1846 if (pp[-1] == '\r') pp--;
1847 *pp = 0;
1848 goto GOT_DATA; /* Break out of both loops */
1849 }
1850 }
1851
1852 /* Reached the end of the data without finding \n. Let the loop continue to
1853 read some more, if there is room. */
1854
1855 p = pp;
1856 }
1857
1858GOT_DATA:
1859
1860/* We have received a line of data. Check it carefully. It must start with the
1861same two port numbers that we sent, followed by data as defined by the RFC. For
1862example,
1863
1864 12345 , 25 : USERID : UNIX :root
1865
1866However, the amount of white space may be different to what we sent. In the
1867"osname" field there may be several sub-fields, comma separated. The data we
1868actually want to save follows the third colon. Some systems put leading spaces
1869in it - we discard those. */
1870
1871if (sscanf(CS buffer + qlen, "%d , %d%n", &received_sender_port,
1872 &received_interface_port, &n) != 2 ||
1873 received_sender_port != sender_host_port ||
1874 received_interface_port != interface_port)
1875 goto END_OFF;
1876
1877p = buffer + qlen + n;
1878while(isspace(*p)) p++;
1879if (*p++ != ':') goto END_OFF;
1880while(isspace(*p)) p++;
1881if (Ustrncmp(p, "USERID", 6) != 0) goto END_OFF;
1882p += 6;
1883while(isspace(*p)) p++;
1884if (*p++ != ':') goto END_OFF;
1885while (*p != 0 && *p != ':') p++;
1886if (*p++ == 0) goto END_OFF;
1887while(isspace(*p)) p++;
1888if (*p == 0) goto END_OFF;
1889
1890/* The rest of the line is the data we want. We turn it into printing
1891characters when we save it, so that it cannot mess up the format of any logging
1892or Received: lines into which it gets inserted. We keep a maximum of 127
1893characters. */
1894
1895sender_ident = string_printing(string_copyn(p, 127));
1896DEBUG(D_ident) debug_printf("sender_ident = %s\n", sender_ident);
1897
1898END_OFF:
f1e894f3 1899(void)close(sock);
059ec3d9
PH
1900return;
1901}
1902
1903
1904
1905
1906/*************************************************
1907* Match host to a single host-list item *
1908*************************************************/
1909
1910/* This function compares a host (name or address) against a single item
1911from a host list. The host name gets looked up if it is needed and is not
1912already known. The function is called from verify_check_this_host() via
1913match_check_list(), which is why most of its arguments are in a single block.
1914
1915Arguments:
1916 arg the argument block (see below)
1917 ss the host-list item
1918 valueptr where to pass back looked up data, or NULL
1919 error for error message when returning ERROR
1920
1921The block contains:
32d668a5
PH
1922 host_name (a) the host name, or
1923 (b) NULL, implying use sender_host_name and
1924 sender_host_aliases, looking them up if required, or
1925 (c) the empty string, meaning that only IP address matches
1926 are permitted
059ec3d9
PH
1927 host_address the host address
1928 host_ipv4 the IPv4 address taken from an IPv6 one
1929
1930Returns: OK matched
1931 FAIL did not match
1932 DEFER lookup deferred
32d668a5
PH
1933 ERROR (a) failed to find the host name or IP address, or
1934 (b) unknown lookup type specified, or
1935 (c) host name encountered when only IP addresses are
1936 being matched
059ec3d9
PH
1937*/
1938
32d668a5 1939int
059ec3d9
PH
1940check_host(void *arg, uschar *ss, uschar **valueptr, uschar **error)
1941{
1942check_host_block *cb = (check_host_block *)arg;
32d668a5 1943int mlen = -1;
059ec3d9 1944int maskoffset;
32d668a5 1945BOOL iplookup = FALSE;
059ec3d9 1946BOOL isquery = FALSE;
32d668a5
PH
1947BOOL isiponly = cb->host_name != NULL && cb->host_name[0] == 0;
1948uschar *t = ss;
1949uschar *semicolon;
059ec3d9
PH
1950uschar **aliases;
1951
1952/* Optimize for the special case when the pattern is "*". */
1953
1954if (*ss == '*' && ss[1] == 0) return OK;
1955
1956/* If the pattern is empty, it matches only in the case when there is no host -
1957this can occur in ACL checking for SMTP input using the -bs option. In this
1958situation, the host address is the empty string. */
1959
1960if (cb->host_address[0] == 0) return (*ss == 0)? OK : FAIL;
1961if (*ss == 0) return FAIL;
1962
32d668a5
PH
1963/* If the pattern is precisely "@" then match against the primary host name,
1964provided that host name matching is permitted; if it's "@[]" match against the
1965local host's IP addresses. */
059ec3d9
PH
1966
1967if (*ss == '@')
1968 {
32d668a5
PH
1969 if (ss[1] == 0)
1970 {
1971 if (isiponly) return ERROR;
1972 ss = primary_hostname;
1973 }
059ec3d9
PH
1974 else if (Ustrcmp(ss, "@[]") == 0)
1975 {
1976 ip_address_item *ip;
1977 for (ip = host_find_interfaces(); ip != NULL; ip = ip->next)
1978 if (Ustrcmp(ip->address, cb->host_address) == 0) return OK;
1979 return FAIL;
1980 }
1981 }
1982
1983/* If the pattern is an IP address, optionally followed by a bitmask count, do
1984a (possibly masked) comparision with the current IP address. */
1985
a5a28604 1986if (string_is_ip_address(ss, &maskoffset) > 0)
059ec3d9
PH
1987 return (host_is_in_net(cb->host_address, ss, maskoffset)? OK : FAIL);
1988
32d668a5 1989/* See if there is a semicolon in the pattern */
059ec3d9 1990
32d668a5
PH
1991semicolon = Ustrchr(ss, ';');
1992
1993/* If we are doing an IP address only match, then all lookups must be IP
1994address lookups. */
1995
1996if (isiponly)
059ec3d9 1997 {
32d668a5
PH
1998 iplookup = semicolon != NULL;
1999 }
059ec3d9 2000
32d668a5
PH
2001/* Otherwise, if the item is of the form net[n]-lookup;<file|query> then it is
2002a lookup on a masked IP network, in textual form. The net- stuff really only
2003applies to single-key lookups where the key is implicit. For query-style
2004lookups the key is specified in the query. From release 4.30, the use of net-
2005for query style is no longer needed, but we retain it for backward
2006compatibility. */
059ec3d9 2007
32d668a5
PH
2008else if (Ustrncmp(ss, "net", 3) == 0 && semicolon != NULL)
2009 {
2010 mlen = 0;
2011 for (t = ss + 3; isdigit(*t); t++) mlen = mlen * 10 + *t - '0';
2012 if (mlen == 0 && t == ss+3) mlen = -1; /* No mask supplied */
2013 iplookup = (*t++ == '-');
2014 }
059ec3d9 2015
32d668a5 2016/* Do the IP address lookup if that is indeed what we have */
059ec3d9 2017
32d668a5
PH
2018if (iplookup)
2019 {
2020 int insize;
2021 int search_type;
2022 int incoming[4];
2023 void *handle;
2024 uschar *filename, *key, *result;
2025 uschar buffer[64];
059ec3d9 2026
32d668a5 2027 /* Find the search type */
059ec3d9 2028
32d668a5 2029 search_type = search_findtype(t, semicolon - t);
059ec3d9 2030
32d668a5
PH
2031 if (search_type < 0) log_write(0, LOG_MAIN|LOG_PANIC_DIE, "%s",
2032 search_error_message);
059ec3d9 2033
13b685f9
PH
2034 /* Adjust parameters for the type of lookup. For a query-style lookup, there
2035 is no file name, and the "key" is just the query. For query-style with a file
2036 name, we have to fish the file off the start of the query. For a single-key
2037 lookup, the key is the current IP address, masked appropriately, and
2038 reconverted to text form, with the mask appended. For IPv6 addresses, specify
2039 dot separators instead of colons. */
059ec3d9 2040
13b685f9
PH
2041 if (mac_islookup(search_type, lookup_absfilequery))
2042 {
2043 filename = semicolon + 1;
2044 key = filename;
2045 while (*key != 0 && !isspace(*key)) key++;
2046 filename = string_copyn(filename, key - filename);
2047 while (isspace(*key)) key++;
2048 }
2049 else if (mac_islookup(search_type, lookup_querystyle))
32d668a5
PH
2050 {
2051 filename = NULL;
2052 key = semicolon + 1;
2053 }
2054 else
2055 {
2056 insize = host_aton(cb->host_address, incoming);
2057 host_mask(insize, incoming, mlen);
2058 (void)host_nmtoa(insize, incoming, mlen, buffer, '.');
2059 key = buffer;
2060 filename = semicolon + 1;
059ec3d9 2061 }
32d668a5
PH
2062
2063 /* Now do the actual lookup; note that there is no search_close() because
2064 of the caching arrangements. */
2065
2066 handle = search_open(filename, search_type, 0, NULL, NULL);
2067 if (handle == NULL) log_write(0, LOG_MAIN|LOG_PANIC_DIE, "%s",
2068 search_error_message);
2069 result = search_find(handle, filename, key, -1, NULL, 0, 0, NULL);
2070 if (valueptr != NULL) *valueptr = result;
2071 return (result != NULL)? OK : search_find_defer? DEFER: FAIL;
059ec3d9
PH
2072 }
2073
2074/* The pattern is not an IP address or network reference of any kind. That is,
32d668a5
PH
2075it is a host name pattern. If this is an IP only match, there's an error in the
2076host list. */
2077
2078if (isiponly)
2079 {
2080 *error = US"cannot match host name in match_ip list";
2081 return ERROR;
2082 }
2083
2084/* Check the characters of the pattern to see if they comprise only letters,
2085digits, full stops, and hyphens (the constituents of domain names). Allow
2086underscores, as they are all too commonly found. Sigh. Also, if
2087allow_utf8_domains is set, allow top-bit characters. */
059ec3d9
PH
2088
2089for (t = ss; *t != 0; t++)
2090 if (!isalnum(*t) && *t != '.' && *t != '-' && *t != '_' &&
2091 (!allow_utf8_domains || *t < 128)) break;
2092
2093/* If the pattern is a complete domain name, with no fancy characters, look up
2094its IP address and match against that. Note that a multi-homed host will add
2095items to the chain. */
2096
2097if (*t == 0)
2098 {
2099 int rc;
2100 host_item h;
2101 h.next = NULL;
2102 h.name = ss;
2103 h.address = NULL;
2104 h.mx = MX_NONE;
2105 rc = host_find_byname(&h, NULL, NULL, FALSE);
2106 if (rc == HOST_FOUND || rc == HOST_FOUND_LOCAL)
2107 {
2108 host_item *hh;
2109 for (hh = &h; hh != NULL; hh = hh->next)
2110 {
2111 if (Ustrcmp(hh->address, (Ustrchr(hh->address, ':') == NULL)?
2112 cb->host_ipv4 : cb->host_address) == 0)
2113 return OK;
2114 }
2115 return FAIL;
2116 }
2117 if (rc == HOST_FIND_AGAIN) return DEFER;
2118 *error = string_sprintf("failed to find IP address for %s", ss);
2119 return ERROR;
2120 }
2121
2122/* Almost all subsequent comparisons require the host name, and can be done
2123using the general string matching function. When this function is called for
2124outgoing hosts, the name is always given explicitly. If it is NULL, it means we
2125must use sender_host_name and its aliases, looking them up if necessary. */
2126
2127if (cb->host_name != NULL) /* Explicit host name given */
2128 return match_check_string(cb->host_name, ss, -1, TRUE, TRUE, TRUE,
2129 valueptr);
2130
2131/* Host name not given; in principle we need the sender host name and its
2132aliases. However, for query-style lookups, we do not need the name if the
2133query does not contain $sender_host_name. From release 4.23, a reference to
2134$sender_host_name causes it to be looked up, so we don't need to do the lookup
2135on spec. */
2136
2137if ((semicolon = Ustrchr(ss, ';')) != NULL)
2138 {
2139 uschar *affix;
2140 int partial, affixlen, starflags, id;
2141
2142 *semicolon = 0;
2143 id = search_findtype_partial(ss, &partial, &affix, &affixlen, &starflags);
2144 *semicolon=';';
2145
2146 if (id < 0) /* Unknown lookup type */
2147 {
2148 log_write(0, LOG_MAIN|LOG_PANIC, "%s in host list item \"%s\"",
2149 search_error_message, ss);
2150 return DEFER;
2151 }
13b685f9 2152 isquery = mac_islookup(id, lookup_querystyle|lookup_absfilequery);
059ec3d9
PH
2153 }
2154
2155if (isquery)
2156 {
2157 switch(match_check_string(US"", ss, -1, TRUE, TRUE, TRUE, valueptr))
2158 {
2159 case OK: return OK;
2160 case DEFER: return DEFER;
2161 default: return FAIL;
2162 }
2163 }
2164
2165/* Not a query-style lookup; must ensure the host name is present, and then we
2166do a check on the name and all its aliases. */
2167
2168if (sender_host_name == NULL)
2169 {
2170 HDEBUG(D_host_lookup)
2171 debug_printf("sender host name required, to match against %s\n", ss);
2172 if (host_lookup_failed || host_name_lookup() != OK)
2173 {
2174 *error = string_sprintf("failed to find host name for %s",
2175 sender_host_address);;
2176 return ERROR;
2177 }
2178 host_build_sender_fullhost();
2179 }
2180
2181/* Match on the sender host name, using the general matching function */
2182
2183switch(match_check_string(sender_host_name, ss, -1, TRUE, TRUE, TRUE,
2184 valueptr))
2185 {
2186 case OK: return OK;
2187 case DEFER: return DEFER;
2188 }
2189
2190/* If there are aliases, try matching on them. */
2191
2192aliases = sender_host_aliases;
2193while (*aliases != NULL)
2194 {
2195 switch(match_check_string(*aliases++, ss, -1, TRUE, TRUE, TRUE, valueptr))
2196 {
2197 case OK: return OK;
2198 case DEFER: return DEFER;
2199 }
2200 }
2201return FAIL;
2202}
2203
2204
2205
2206
2207/*************************************************
2208* Check a specific host matches a host list *
2209*************************************************/
2210
2211/* This function is passed a host list containing items in a number of
2212different formats and the identity of a host. Its job is to determine whether
2213the given host is in the set of hosts defined by the list. The host name is
2214passed as a pointer so that it can be looked up if needed and not already
2215known. This is commonly the case when called from verify_check_host() to check
2216an incoming connection. When called from elsewhere the host name should usually
2217be set.
2218
2219This function is now just a front end to match_check_list(), which runs common
2220code for scanning a list. We pass it the check_host() function to perform a
2221single test.
2222
2223Arguments:
2224 listptr pointer to the host list
2225 cache_bits pointer to cache for named lists, or NULL
2226 host_name the host name or NULL, implying use sender_host_name and
2227 sender_host_aliases, looking them up if required
2228 host_address the IP address
2229 valueptr if not NULL, data from a lookup is passed back here
2230
2231Returns: OK if the host is in the defined set
2232 FAIL if the host is not in the defined set,
2233 DEFER if a data lookup deferred (not a host lookup)
2234
2235If the host name was needed in order to make a comparison, and could not be
2236determined from the IP address, the result is FAIL unless the item
2237"+allow_unknown" was met earlier in the list, in which case OK is returned. */
2238
2239int
2240verify_check_this_host(uschar **listptr, unsigned int *cache_bits,
2241 uschar *host_name, uschar *host_address, uschar **valueptr)
2242{
d4eb88df 2243int rc;
059ec3d9 2244unsigned int *local_cache_bits = cache_bits;
d4eb88df 2245uschar *save_host_address = deliver_host_address;
059ec3d9
PH
2246check_host_block cb;
2247cb.host_name = host_name;
2248cb.host_address = host_address;
2249
2250if (valueptr != NULL) *valueptr = NULL;
2251
2252/* If the host address starts off ::ffff: it is an IPv6 address in
2253IPv4-compatible mode. Find the IPv4 part for checking against IPv4
2254addresses. */
2255
2256cb.host_ipv4 = (Ustrncmp(host_address, "::ffff:", 7) == 0)?
2257 host_address + 7 : host_address;
2258
8e669ac1
PH
2259/* During the running of the check, put the IP address into $host_address. In
2260the case of calls from the smtp transport, it will already be there. However,
2261in other calls (e.g. when testing ignore_target_hosts), it won't. Just to be on
d4eb88df
PH
2262the safe side, any existing setting is preserved, though as I write this
2263(November 2004) I can't see any cases where it is actually needed. */
2264
2265deliver_host_address = host_address;
2266rc = match_check_list(
2267 listptr, /* the list */
2268 0, /* separator character */
2269 &hostlist_anchor, /* anchor pointer */
2270 &local_cache_bits, /* cache pointer */
2271 check_host, /* function for testing */
2272 &cb, /* argument for function */
2273 MCL_HOST, /* type of check */
8e669ac1 2274 (host_address == sender_host_address)?
d4eb88df
PH
2275 US"host" : host_address, /* text for debugging */
2276 valueptr); /* where to pass back data */
2277deliver_host_address = save_host_address;
8e669ac1 2278return rc;
059ec3d9
PH
2279}
2280
2281
2282
2283
2284/*************************************************
2285* Check the remote host matches a list *
2286*************************************************/
2287
2288/* This is a front end to verify_check_this_host(), created because checking
2289the remote host is a common occurrence. With luck, a good compiler will spot
2290the tail recursion and optimize it. If there's no host address, this is
2291command-line SMTP input - check against an empty string for the address.
2292
2293Arguments:
2294 listptr pointer to the host list
2295
2296Returns: the yield of verify_check_this_host(),
2297 i.e. OK, FAIL, or DEFER
2298*/
2299
2300int
2301verify_check_host(uschar **listptr)
2302{
2303return verify_check_this_host(listptr, sender_host_cache, NULL,
2304 (sender_host_address == NULL)? US"" : sender_host_address, NULL);
2305}
2306
2307
2308
2309
2310
2311/*************************************************
2312* Invert an IP address for a DNS black list *
2313*************************************************/
2314
2315/*
2316Arguments:
2317 buffer where to put the answer
2318 address the address to invert
2319*/
2320
2321static void
2322invert_address(uschar *buffer, uschar *address)
2323{
2324int bin[4];
2325uschar *bptr = buffer;
2326
2327/* If this is an IPv4 address mapped into IPv6 format, adjust the pointer
2328to the IPv4 part only. */
2329
2330if (Ustrncmp(address, "::ffff:", 7) == 0) address += 7;
2331
2332/* Handle IPv4 address: when HAVE_IPV6 is false, the result of host_aton() is
2333always 1. */
2334
2335if (host_aton(address, bin) == 1)
2336 {
2337 int i;
2338 int x = bin[0];
2339 for (i = 0; i < 4; i++)
2340 {
2341 sprintf(CS bptr, "%d.", x & 255);
2342 while (*bptr) bptr++;
2343 x >>= 8;
2344 }
2345 }
2346
2347/* Handle IPv6 address. Actually, as far as I know, there are no IPv6 addresses
2348in any DNS black lists, and the format in which they will be looked up is
2349unknown. This is just a guess. */
2350
2351#if HAVE_IPV6
2352else
2353 {
2354 int i, j;
2355 for (j = 3; j >= 0; j--)
2356 {
2357 int x = bin[j];
2358 for (i = 0; i < 8; i++)
2359 {
2360 sprintf(CS bptr, "%x.", x & 15);
2361 while (*bptr) bptr++;
2362 x >>= 4;
2363 }
2364 }
2365 }
2366#endif
2367}
2368
2369
2370
2371/*************************************************
0bcb2a0e
PH
2372* Perform a single dnsbl lookup *
2373*************************************************/
2374
2375/* This function is called from verify_check_dnsbl() below.
2376
2377Arguments:
2378 domain the outer dnsbl domain (for debug message)
8e669ac1 2379 keydomain the current keydomain (for debug message)
0bcb2a0e 2380 query the domain to be looked up
8e669ac1
PH
2381 iplist the list of matching IP addresses
2382 bitmask true if bitmask matching is wanted
2383 invert_result true if result to be inverted
2384 defer_return what to return for a defer
0bcb2a0e
PH
2385
2386Returns: OK if lookup succeeded
2387 FAIL if not
2388*/
2389
2390static int
8e669ac1 2391one_check_dnsbl(uschar *domain, uschar *keydomain, uschar *query,
0bcb2a0e 2392 uschar *iplist, BOOL bitmask, BOOL invert_result, int defer_return)
8e669ac1 2393{
0bcb2a0e
PH
2394dns_answer dnsa;
2395dns_scan dnss;
2396tree_node *t;
2397dnsbl_cache_block *cb;
2398int old_pool = store_pool;
2399
2400/* Look for this query in the cache. */
2401
2402t = tree_search(dnsbl_cache, query);
2403
2404/* If not cached from a previous lookup, we must do a DNS lookup, and
2405cache the result in permanent memory. */
2406
2407if (t == NULL)
2408 {
2409 store_pool = POOL_PERM;
2410
2411 /* Set up a tree entry to cache the lookup */
2412
2413 t = store_get(sizeof(tree_node) + Ustrlen(query));
2414 Ustrcpy(t->name, query);
2415 t->data.ptr = cb = store_get(sizeof(dnsbl_cache_block));
2416 (void)tree_insertnode(&dnsbl_cache, t);
2417
2418 /* Do the DNS loopup . */
2419
2420 HDEBUG(D_dnsbl) debug_printf("new DNS lookup for %s\n", query);
2421 cb->rc = dns_basic_lookup(&dnsa, query, T_A);
2422 cb->text_set = FALSE;
2423 cb->text = NULL;
2424 cb->rhs = NULL;
2425
2426 /* If the lookup succeeded, cache the RHS address. The code allows for
2427 more than one address - this was for complete generality and the possible
2428 use of A6 records. However, A6 records have been reduced to experimental
2429 status (August 2001) and may die out. So they may never get used at all,
2430 let alone in dnsbl records. However, leave the code here, just in case.
2431
2432 Quite apart from one A6 RR generating multiple addresses, there are DNS
2433 lists that return more than one A record, so we must handle multiple
2434 addresses generated in that way as well. */
2435
2436 if (cb->rc == DNS_SUCCEED)
2437 {
2438 dns_record *rr;
2439 dns_address **addrp = &(cb->rhs);
2440 for (rr = dns_next_rr(&dnsa, &dnss, RESET_ANSWERS);
2441 rr != NULL;
2442 rr = dns_next_rr(&dnsa, &dnss, RESET_NEXT))
2443 {
2444 if (rr->type == T_A)
2445 {
2446 dns_address *da = dns_address_from_rr(&dnsa, rr);
2447 if (da != NULL)
2448 {
2449 *addrp = da;
2450 while (da->next != NULL) da = da->next;
2451 addrp = &(da->next);
2452 }
2453 }
2454 }
2455
2456 /* If we didn't find any A records, change the return code. This can
2457 happen when there is a CNAME record but there are no A records for what
2458 it points to. */
2459
2460 if (cb->rhs == NULL) cb->rc = DNS_NODATA;
2461 }
2462
2463 store_pool = old_pool;
2464 }
2465
2466/* Previous lookup was cached */
2467
2468else
2469 {
2470 HDEBUG(D_dnsbl) debug_printf("using result of previous DNS lookup\n");
2471 cb = t->data.ptr;
2472 }
2473
2474/* We now have the result of the DNS lookup, either newly done, or cached
2475from a previous call. If the lookup succeeded, check against the address
2476list if there is one. This may be a positive equality list (introduced by
2477"="), a negative equality list (introduced by "!="), a positive bitmask
2478list (introduced by "&"), or a negative bitmask list (introduced by "!&").*/
2479
2480if (cb->rc == DNS_SUCCEED)
2481 {
2482 dns_address *da = NULL;
2483 uschar *addlist = cb->rhs->address;
2484
2485 /* For A and AAAA records, there may be multiple addresses from multiple
2486 records. For A6 records (currently not expected to be used) there may be
2487 multiple addresses from a single record. */
2488
2489 for (da = cb->rhs->next; da != NULL; da = da->next)
2490 addlist = string_sprintf("%s, %s", addlist, da->address);
2491
2492 HDEBUG(D_dnsbl) debug_printf("DNS lookup for %s succeeded (yielding %s)\n",
2493 query, addlist);
2494
2495 /* Address list check; this can be either for equality, or via a bitmask.
2496 In the latter case, all the bits must match. */
2497
2498 if (iplist != NULL)
2499 {
2500 int ipsep = ',';
2501 uschar ip[46];
2502 uschar *ptr = iplist;
2503
2504 while (string_nextinlist(&ptr, &ipsep, ip, sizeof(ip)) != NULL)
2505 {
2506 /* Handle exact matching */
2507 if (!bitmask)
2508 {
2509 for (da = cb->rhs; da != NULL; da = da->next)
2510 {
2511 if (Ustrcmp(CS da->address, ip) == 0) break;
2512 }
2513 }
2514 /* Handle bitmask matching */
2515 else
2516 {
2517 int address[4];
2518 int mask = 0;
2519
2520 /* At present, all known DNS blocking lists use A records, with
2521 IPv4 addresses on the RHS encoding the information they return. I
2522 wonder if this will linger on as the last vestige of IPv4 when IPv6
2523 is ubiquitous? Anyway, for now we use paranoia code to completely
2524 ignore IPv6 addresses. The default mask is 0, which always matches.
2525 We change this only for IPv4 addresses in the list. */
2526
2527 if (host_aton(ip, address) == 1) mask = address[0];
2528
2529 /* Scan the returned addresses, skipping any that are IPv6 */
2530
2531 for (da = cb->rhs; da != NULL; da = da->next)
2532 {
2533 if (host_aton(da->address, address) != 1) continue;
2534 if ((address[0] & mask) == mask) break;
2535 }
2536 }
2537
2538 /* Break out if a match has been found */
2539
2540 if (da != NULL) break;
2541 }
2542
2543 /* If either
2544
2545 (a) No IP address in a positive list matched, or
2546 (b) An IP address in a negative list did match
2547
2548 then behave as if the DNSBL lookup had not succeeded, i.e. the host is
2549 not on the list. */
2550
2551 if (invert_result != (da == NULL))
2552 {
2553 HDEBUG(D_dnsbl)
2554 {
2555 debug_printf("=> but we are not accepting this block class because\n");
2556 debug_printf("=> there was %s match for %c%s\n",
2557 invert_result? "an exclude":"no", bitmask? '&' : '=', iplist);
2558 }
8e669ac1 2559 return FAIL;
0bcb2a0e
PH
2560 }
2561 }
2562
2563 /* Either there was no IP list, or the record matched. Look up a TXT record
2564 if it hasn't previously been done. */
2565
2566 if (!cb->text_set)
2567 {
2568 cb->text_set = TRUE;
2569 if (dns_basic_lookup(&dnsa, query, T_TXT) == DNS_SUCCEED)
2570 {
2571 dns_record *rr;
2572 for (rr = dns_next_rr(&dnsa, &dnss, RESET_ANSWERS);
2573 rr != NULL;
2574 rr = dns_next_rr(&dnsa, &dnss, RESET_NEXT))
2575 if (rr->type == T_TXT) break;
2576 if (rr != NULL)
2577 {
2578 int len = (rr->data)[0];
2579 if (len > 511) len = 127;
2580 store_pool = POOL_PERM;
2581 cb->text = string_sprintf("%.*s", len, (const uschar *)(rr->data+1));
2582 store_pool = old_pool;
2583 }
2584 }
2585 }
2586
2587 dnslist_value = addlist;
2588 dnslist_text = cb->text;
2589 return OK;
2590 }
2591
2592/* There was a problem with the DNS lookup */
2593
2594if (cb->rc != DNS_NOMATCH && cb->rc != DNS_NODATA)
2595 {
2596 log_write(L_dnslist_defer, LOG_MAIN,
2597 "DNS list lookup defer (probably timeout) for %s: %s", query,
2598 (defer_return == OK)? US"assumed in list" :
2599 (defer_return == FAIL)? US"assumed not in list" :
2600 US"returned DEFER");
2601 return defer_return;
2602 }
2603
2604/* No entry was found in the DNS; continue for next domain */
2605
2606HDEBUG(D_dnsbl)
2607 {
2608 debug_printf("DNS lookup for %s failed\n", query);
2609 debug_printf("=> that means %s is not listed at %s\n",
2610 keydomain, domain);
2611 }
2612
2613return FAIL;
2614}
2615
2616
2617
2618
2619/*************************************************
059ec3d9
PH
2620* Check host against DNS black lists *
2621*************************************************/
2622
2623/* This function runs checks against a list of DNS black lists, until one
2624matches. Each item on the list can be of the form
2625
2626 domain=ip-address/key
2627
2628The domain is the right-most domain that is used for the query, for example,
2629blackholes.mail-abuse.org. If the IP address is present, there is a match only
2630if the DNS lookup returns a matching IP address. Several addresses may be
2631given, comma-separated, for example: x.y.z=127.0.0.1,127.0.0.2.
2632
2633If no key is given, what is looked up in the domain is the inverted IP address
2634of the current client host. If a key is given, it is used to construct the
2635domain for the lookup. For example,
2636
2637 dsn.rfc-ignorant.org/$sender_address_domain
2638
2639After finding a match in the DNS, the domain is placed in $dnslist_domain, and
2640then we check for a TXT record for an error message, and if found, save its
2641value in $dnslist_text. We also cache everything in a tree, to optimize
2642multiple lookups.
2643
2644Note: an address for testing RBL is 192.203.178.39
2645Note: an address for testing DUL is 192.203.178.4
2646Note: a domain for testing RFCI is example.tld.dsn.rfc-ignorant.org
2647
2648Arguments:
2649 listptr the domain/address/data list
2650
2651Returns: OK successful lookup (i.e. the address is on the list), or
2652 lookup deferred after +include_unknown
2653 FAIL name not found, or no data found for the given type, or
2654 lookup deferred after +exclude_unknown (default)
2655 DEFER lookup failure, if +defer_unknown was set
2656*/
2657
2658int
2659verify_check_dnsbl(uschar **listptr)
2660{
2661int sep = 0;
2662int defer_return = FAIL;
059ec3d9
PH
2663BOOL invert_result = FALSE;
2664uschar *list = *listptr;
2665uschar *domain;
2666uschar *s;
2667uschar buffer[1024];
2668uschar query[256]; /* DNS domain max length */
2669uschar revadd[128]; /* Long enough for IPv6 address */
2670
2671/* Indicate that the inverted IP address is not yet set up */
2672
2673revadd[0] = 0;
2674
0bcb2a0e
PH
2675/* In case this is the first time the DNS resolver is being used. */
2676
2677dns_init(FALSE, FALSE);
2678
059ec3d9
PH
2679/* Loop through all the domains supplied, until something matches */
2680
2681while ((domain = string_nextinlist(&list, &sep, buffer, sizeof(buffer))) != NULL)
2682 {
0bcb2a0e 2683 int rc;
059ec3d9
PH
2684 BOOL frc;
2685 BOOL bitmask = FALSE;
059ec3d9
PH
2686 uschar *iplist;
2687 uschar *key;
059ec3d9
PH
2688
2689 HDEBUG(D_dnsbl) debug_printf("DNS list check: %s\n", domain);
2690
2691 /* Deal with special values that change the behaviour on defer */
2692
2693 if (domain[0] == '+')
2694 {
2695 if (strcmpic(domain, US"+include_unknown") == 0) defer_return = OK;
2696 else if (strcmpic(domain, US"+exclude_unknown") == 0) defer_return = FAIL;
2697 else if (strcmpic(domain, US"+defer_unknown") == 0) defer_return = DEFER;
2698 else
2699 log_write(0, LOG_MAIN|LOG_PANIC, "unknown item in dnslist (ignored): %s",
2700 domain);
2701 continue;
2702 }
2703
2704 /* See if there's explicit data to be looked up */
2705
2706 key = Ustrchr(domain, '/');
2707 if (key != NULL) *key++ = 0;
2708
2709 /* See if there's a list of addresses supplied after the domain name. This is
2710 introduced by an = or a & character; if preceded by ! we invert the result.
2711 */
2712
2713 iplist = Ustrchr(domain, '=');
2714 if (iplist == NULL)
2715 {
2716 bitmask = TRUE;
2717 iplist = Ustrchr(domain, '&');
2718 }
2719
2720 if (iplist != NULL)
2721 {
2722 if (iplist > domain && iplist[-1] == '!')
2723 {
2724 invert_result = TRUE;
2725 iplist[-1] = 0;
2726 }
2727 *iplist++ = 0;
2728 }
2729
2730 /* Check that what we have left is a sensible domain name. There is no reason
2731 why these domains should in fact use the same syntax as hosts and email
2732 domains, but in practice they seem to. However, there is little point in
2733 actually causing an error here, because that would no doubt hold up incoming
2734 mail. Instead, I'll just log it. */
2735
2736 for (s = domain; *s != 0; s++)
2737 {
2738 if (!isalnum(*s) && *s != '-' && *s != '.')
2739 {
2740 log_write(0, LOG_MAIN, "dnslists domain \"%s\" contains "
2741 "strange characters - is this right?", domain);
2742 break;
2743 }
2744 }
2745
8e669ac1 2746 /* If there is no key string, construct the query by adding the domain name
0bcb2a0e 2747 onto the inverted host address, and perform a single DNS lookup. */
8e669ac1 2748
059ec3d9
PH
2749 if (key == NULL)
2750 {
2751 if (sender_host_address == NULL) return FAIL; /* can never match */
2752 if (revadd[0] == 0) invert_address(revadd, sender_host_address);
2753 frc = string_format(query, sizeof(query), "%s%s", revadd, domain);
8e669ac1 2754
0bcb2a0e 2755 if (!frc)
059ec3d9 2756 {
0bcb2a0e
PH
2757 log_write(0, LOG_MAIN|LOG_PANIC, "dnslist query is too long "
2758 "(ignored): %s...", query);
2759 continue;
059ec3d9 2760 }
8e669ac1
PH
2761
2762 rc = one_check_dnsbl(domain, sender_host_address, query, iplist, bitmask,
0bcb2a0e 2763 invert_result, defer_return);
8e669ac1 2764
0bcb2a0e
PH
2765 if (rc == OK)
2766 {
2767 dnslist_domain = string_copy(domain);
8e669ac1 2768 HDEBUG(D_dnsbl) debug_printf("=> that means %s is listed at %s\n",
0bcb2a0e
PH
2769 sender_host_address, domain);
2770 }
8e669ac1 2771
0bcb2a0e 2772 if (rc != FAIL) return rc; /* OK or DEFER */
059ec3d9 2773 }
8e669ac1
PH
2774
2775 /* If there is a key string, it can be a list of domains or IP addresses to
0bcb2a0e 2776 be concatenated with the main domain. */
8e669ac1 2777
059ec3d9
PH
2778 else
2779 {
0bcb2a0e 2780 int keysep = 0;
8e669ac1
PH
2781 BOOL defer = FALSE;
2782 uschar *keydomain;
0bcb2a0e 2783 uschar keybuffer[256];
8e669ac1
PH
2784
2785 while ((keydomain = string_nextinlist(&key, &keysep, keybuffer,
0bcb2a0e 2786 sizeof(keybuffer))) != NULL)
8e669ac1 2787 {
a5a28604 2788 if (string_is_ip_address(keydomain, NULL) > 0)
059ec3d9 2789 {
0bcb2a0e
PH
2790 uschar keyrevadd[128];
2791 invert_address(keyrevadd, keydomain);
8e669ac1 2792 frc = string_format(query, sizeof(query), "%s%s", keyrevadd, domain);
0bcb2a0e
PH
2793 }
2794 else
8e669ac1 2795 {
0bcb2a0e 2796 frc = string_format(query, sizeof(query), "%s.%s", keydomain, domain);
059ec3d9
PH
2797 }
2798
0bcb2a0e 2799 if (!frc)
059ec3d9 2800 {
0bcb2a0e
PH
2801 log_write(0, LOG_MAIN|LOG_PANIC, "dnslist query is too long "
2802 "(ignored): %s...", query);
2803 continue;
059ec3d9 2804 }
8e669ac1
PH
2805
2806 rc = one_check_dnsbl(domain, keydomain, query, iplist, bitmask,
0bcb2a0e 2807 invert_result, defer_return);
8e669ac1 2808
0bcb2a0e 2809 if (rc == OK)
059ec3d9 2810 {
0bcb2a0e 2811 dnslist_domain = string_copy(domain);
8e669ac1 2812 HDEBUG(D_dnsbl) debug_printf("=> that means %s is listed at %s\n",
0bcb2a0e 2813 keydomain, domain);
8e669ac1 2814 return OK;
059ec3d9 2815 }
8e669ac1 2816
c38d6da9
PH
2817 /* If the lookup deferred, remember this fact. We keep trying the rest
2818 of the list to see if we get a useful result, and if we don't, we return
2819 DEFER at the end. */
059ec3d9 2820
c38d6da9 2821 if (rc == DEFER) defer = TRUE;
0bcb2a0e 2822 } /* continue with next keystring domain/address */
c38d6da9
PH
2823
2824 if (defer) return DEFER;
8e669ac1 2825 }
0bcb2a0e 2826 } /* continue with next dnsdb outer domain */
059ec3d9
PH
2827
2828return FAIL;
2829}
2830
2831/* End of verify.c */