RFC3461 support - MIME DSN messages. Bug 118
[exim.git] / src / src / deliver.c
1 /*************************************************
2 * Exim - an Internet mail transport agent *
3 *************************************************/
4
5 /* Copyright (c) University of Cambridge 1995 - 2014 */
6 /* See the file NOTICE for conditions of use and distribution. */
7
8 /* The main code for delivering a message. */
9
10
11 #include "exim.h"
12
13
14 /* Data block for keeping track of subprocesses for parallel remote
15 delivery. */
16
17 typedef struct pardata {
18 address_item *addrlist; /* chain of addresses */
19 address_item *addr; /* next address data expected for */
20 pid_t pid; /* subprocess pid */
21 int fd; /* pipe fd for getting result from subprocess */
22 int transport_count; /* returned transport count value */
23 BOOL done; /* no more data needed */
24 uschar *msg; /* error message */
25 uschar *return_path; /* return_path for these addresses */
26 } pardata;
27
28 /* Values for the process_recipients variable */
29
30 enum { RECIP_ACCEPT, RECIP_IGNORE, RECIP_DEFER,
31 RECIP_FAIL, RECIP_FAIL_FILTER, RECIP_FAIL_TIMEOUT,
32 RECIP_FAIL_LOOP};
33
34 /* Mutually recursive functions for marking addresses done. */
35
36 static void child_done(address_item *, uschar *);
37 static void address_done(address_item *, uschar *);
38
39 /* Table for turning base-62 numbers into binary */
40
41 static uschar tab62[] =
42 {0,1,2,3,4,5,6,7,8,9,0,0,0,0,0,0, /* 0-9 */
43 0,10,11,12,13,14,15,16,17,18,19,20, /* A-K */
44 21,22,23,24,25,26,27,28,29,30,31,32, /* L-W */
45 33,34,35, 0, 0, 0, 0, 0, /* X-Z */
46 0,36,37,38,39,40,41,42,43,44,45,46, /* a-k */
47 47,48,49,50,51,52,53,54,55,56,57,58, /* l-w */
48 59,60,61}; /* x-z */
49
50
51 /*************************************************
52 * Local static variables *
53 *************************************************/
54
55 /* addr_duplicate is global because it needs to be seen from the Envelope-To
56 writing code. */
57
58 static address_item *addr_defer = NULL;
59 static address_item *addr_failed = NULL;
60 static address_item *addr_fallback = NULL;
61 static address_item *addr_local = NULL;
62 static address_item *addr_new = NULL;
63 static address_item *addr_remote = NULL;
64 static address_item *addr_route = NULL;
65 static address_item *addr_succeed = NULL;
66 #ifdef EXPERIMENTAL_DSN
67 static address_item *addr_dsntmp = NULL;
68 static address_item *addr_senddsn = NULL;
69 #endif
70
71 static FILE *message_log = NULL;
72 static BOOL update_spool;
73 static BOOL remove_journal;
74 static int parcount = 0;
75 static pardata *parlist = NULL;
76 static int return_count;
77 static uschar *frozen_info = US"";
78 static uschar *used_return_path = NULL;
79
80 static uschar spoolname[PATH_MAX];
81
82
83
84 /*************************************************
85 * Make a new address item *
86 *************************************************/
87
88 /* This function gets the store and initializes with default values. The
89 transport_return value defaults to DEFER, so that any unexpected failure to
90 deliver does not wipe out the message. The default unique string is set to a
91 copy of the address, so that its domain can be lowercased.
92
93 Argument:
94 address the RFC822 address string
95 copy force a copy of the address
96
97 Returns: a pointer to an initialized address_item
98 */
99
100 address_item *
101 deliver_make_addr(uschar *address, BOOL copy)
102 {
103 address_item *addr = store_get(sizeof(address_item));
104 *addr = address_defaults;
105 if (copy) address = string_copy(address);
106 addr->address = address;
107 addr->unique = string_copy(address);
108 return addr;
109 }
110
111
112
113
114 /*************************************************
115 * Set expansion values for an address *
116 *************************************************/
117
118 /* Certain expansion variables are valid only when handling an address or
119 address list. This function sets them up or clears the values, according to its
120 argument.
121
122 Arguments:
123 addr the address in question, or NULL to clear values
124 Returns: nothing
125 */
126
127 void
128 deliver_set_expansions(address_item *addr)
129 {
130 if (addr == NULL)
131 {
132 uschar ***p = address_expansions;
133 while (*p != NULL) **p++ = NULL;
134 return;
135 }
136
137 /* Exactly what gets set depends on whether there is one or more addresses, and
138 what they contain. These first ones are always set, taking their values from
139 the first address. */
140
141 if (addr->host_list == NULL)
142 {
143 deliver_host = deliver_host_address = US"";
144 }
145 else
146 {
147 deliver_host = addr->host_list->name;
148 deliver_host_address = addr->host_list->address;
149 }
150
151 deliver_recipients = addr;
152 deliver_address_data = addr->p.address_data;
153 deliver_domain_data = addr->p.domain_data;
154 deliver_localpart_data = addr->p.localpart_data;
155
156 /* These may be unset for multiple addresses */
157
158 deliver_domain = addr->domain;
159 self_hostname = addr->self_hostname;
160
161 #ifdef EXPERIMENTAL_BRIGHTMAIL
162 bmi_deliver = 1; /* deliver by default */
163 bmi_alt_location = NULL;
164 bmi_base64_verdict = NULL;
165 bmi_base64_tracker_verdict = NULL;
166 #endif
167
168 /* If there's only one address we can set everything. */
169
170 if (addr->next == NULL)
171 {
172 address_item *addr_orig;
173
174 deliver_localpart = addr->local_part;
175 deliver_localpart_prefix = addr->prefix;
176 deliver_localpart_suffix = addr->suffix;
177
178 for (addr_orig = addr; addr_orig->parent != NULL;
179 addr_orig = addr_orig->parent);
180 deliver_domain_orig = addr_orig->domain;
181
182 /* Re-instate any prefix and suffix in the original local part. In all
183 normal cases, the address will have a router associated with it, and we can
184 choose the caseful or caseless version accordingly. However, when a system
185 filter sets up a pipe, file, or autoreply delivery, no router is involved.
186 In this case, though, there won't be any prefix or suffix to worry about. */
187
188 deliver_localpart_orig = (addr_orig->router == NULL)? addr_orig->local_part :
189 addr_orig->router->caseful_local_part?
190 addr_orig->cc_local_part : addr_orig->lc_local_part;
191
192 /* If there's a parent, make its domain and local part available, and if
193 delivering to a pipe or file, or sending an autoreply, get the local
194 part from the parent. For pipes and files, put the pipe or file string
195 into address_pipe and address_file. */
196
197 if (addr->parent != NULL)
198 {
199 deliver_domain_parent = addr->parent->domain;
200 deliver_localpart_parent = (addr->parent->router == NULL)?
201 addr->parent->local_part :
202 addr->parent->router->caseful_local_part?
203 addr->parent->cc_local_part : addr->parent->lc_local_part;
204
205 /* File deliveries have their own flag because they need to be picked out
206 as special more often. */
207
208 if (testflag(addr, af_pfr))
209 {
210 if (testflag(addr, af_file)) address_file = addr->local_part;
211 else if (deliver_localpart[0] == '|') address_pipe = addr->local_part;
212 deliver_localpart = addr->parent->local_part;
213 deliver_localpart_prefix = addr->parent->prefix;
214 deliver_localpart_suffix = addr->parent->suffix;
215 }
216 }
217
218 #ifdef EXPERIMENTAL_BRIGHTMAIL
219 /* Set expansion variables related to Brightmail AntiSpam */
220 bmi_base64_verdict = bmi_get_base64_verdict(deliver_localpart_orig, deliver_domain_orig);
221 bmi_base64_tracker_verdict = bmi_get_base64_tracker_verdict(bmi_base64_verdict);
222 /* get message delivery status (0 - don't deliver | 1 - deliver) */
223 bmi_deliver = bmi_get_delivery_status(bmi_base64_verdict);
224 /* if message is to be delivered, get eventual alternate location */
225 if (bmi_deliver == 1) {
226 bmi_alt_location = bmi_get_alt_location(bmi_base64_verdict);
227 };
228 #endif
229
230 }
231
232 /* For multiple addresses, don't set local part, and leave the domain and
233 self_hostname set only if it is the same for all of them. It is possible to
234 have multiple pipe and file addresses, but only when all addresses have routed
235 to the same pipe or file. */
236
237 else
238 {
239 address_item *addr2;
240 if (testflag(addr, af_pfr))
241 {
242 if (testflag(addr, af_file)) address_file = addr->local_part;
243 else if (addr->local_part[0] == '|') address_pipe = addr->local_part;
244 }
245 for (addr2 = addr->next; addr2 != NULL; addr2 = addr2->next)
246 {
247 if (deliver_domain != NULL &&
248 Ustrcmp(deliver_domain, addr2->domain) != 0)
249 deliver_domain = NULL;
250 if (self_hostname != NULL && (addr2->self_hostname == NULL ||
251 Ustrcmp(self_hostname, addr2->self_hostname) != 0))
252 self_hostname = NULL;
253 if (deliver_domain == NULL && self_hostname == NULL) break;
254 }
255 }
256 }
257
258
259
260
261 /*************************************************
262 * Open a msglog file *
263 *************************************************/
264
265 /* This function is used both for normal message logs, and for files in the
266 msglog directory that are used to catch output from pipes. Try to create the
267 directory if it does not exist. From release 4.21, normal message logs should
268 be created when the message is received.
269
270 Argument:
271 filename the file name
272 mode the mode required
273 error used for saying what failed
274
275 Returns: a file descriptor, or -1 (with errno set)
276 */
277
278 static int
279 open_msglog_file(uschar *filename, int mode, uschar **error)
280 {
281 int fd = Uopen(filename, O_WRONLY|O_APPEND|O_CREAT, mode);
282
283 if (fd < 0 && errno == ENOENT)
284 {
285 uschar temp[16];
286 sprintf(CS temp, "msglog/%s", message_subdir);
287 if (message_subdir[0] == 0) temp[6] = 0;
288 (void)directory_make(spool_directory, temp, MSGLOG_DIRECTORY_MODE, TRUE);
289 fd = Uopen(filename, O_WRONLY|O_APPEND|O_CREAT, mode);
290 }
291
292 /* Set the close-on-exec flag and change the owner to the exim uid/gid (this
293 function is called as root). Double check the mode, because the group setting
294 doesn't always get set automatically. */
295
296 if (fd >= 0)
297 {
298 (void)fcntl(fd, F_SETFD, fcntl(fd, F_GETFD) | FD_CLOEXEC);
299 if (fchown(fd, exim_uid, exim_gid) < 0)
300 {
301 *error = US"chown";
302 return -1;
303 }
304 if (fchmod(fd, mode) < 0)
305 {
306 *error = US"chmod";
307 return -1;
308 }
309 }
310 else *error = US"create";
311
312 return fd;
313 }
314
315
316
317
318 /*************************************************
319 * Write to msglog if required *
320 *************************************************/
321
322 /* Write to the message log, if configured. This function may also be called
323 from transports.
324
325 Arguments:
326 format a string format
327
328 Returns: nothing
329 */
330
331 void
332 deliver_msglog(const char *format, ...)
333 {
334 va_list ap;
335 if (!message_logs) return;
336 va_start(ap, format);
337 vfprintf(message_log, format, ap);
338 fflush(message_log);
339 va_end(ap);
340 }
341
342
343
344
345 /*************************************************
346 * Replicate status for batch *
347 *************************************************/
348
349 /* When a transport handles a batch of addresses, it may treat them
350 individually, or it may just put the status in the first one, and return FALSE,
351 requesting that the status be copied to all the others externally. This is the
352 replication function. As well as the status, it copies the transport pointer,
353 which may have changed if appendfile passed the addresses on to a different
354 transport.
355
356 Argument: pointer to the first address in a chain
357 Returns: nothing
358 */
359
360 static void
361 replicate_status(address_item *addr)
362 {
363 address_item *addr2;
364 for (addr2 = addr->next; addr2 != NULL; addr2 = addr2->next)
365 {
366 addr2->transport = addr->transport;
367 addr2->transport_return = addr->transport_return;
368 addr2->basic_errno = addr->basic_errno;
369 addr2->more_errno = addr->more_errno;
370 addr2->special_action = addr->special_action;
371 addr2->message = addr->message;
372 addr2->user_message = addr->user_message;
373 }
374 }
375
376
377
378 /*************************************************
379 * Compare lists of hosts *
380 *************************************************/
381
382 /* This function is given two pointers to chains of host items, and it yields
383 TRUE if the lists refer to the same hosts in the same order, except that
384
385 (1) Multiple hosts with the same non-negative MX values are permitted to appear
386 in different orders. Round-robinning nameservers can cause this to happen.
387
388 (2) Multiple hosts with the same negative MX values less than MX_NONE are also
389 permitted to appear in different orders. This is caused by randomizing
390 hosts lists.
391
392 This enables Exim to use a single SMTP transaction for sending to two entirely
393 different domains that happen to end up pointing at the same hosts.
394
395 Arguments:
396 one points to the first host list
397 two points to the second host list
398
399 Returns: TRUE if the lists refer to the same host set
400 */
401
402 static BOOL
403 same_hosts(host_item *one, host_item *two)
404 {
405 while (one != NULL && two != NULL)
406 {
407 if (Ustrcmp(one->name, two->name) != 0)
408 {
409 int mx = one->mx;
410 host_item *end_one = one;
411 host_item *end_two = two;
412
413 /* Batch up only if there was no MX and the list was not randomized */
414
415 if (mx == MX_NONE) return FALSE;
416
417 /* Find the ends of the shortest sequence of identical MX values */
418
419 while (end_one->next != NULL && end_one->next->mx == mx &&
420 end_two->next != NULL && end_two->next->mx == mx)
421 {
422 end_one = end_one->next;
423 end_two = end_two->next;
424 }
425
426 /* If there aren't any duplicates, there's no match. */
427
428 if (end_one == one) return FALSE;
429
430 /* For each host in the 'one' sequence, check that it appears in the 'two'
431 sequence, returning FALSE if not. */
432
433 for (;;)
434 {
435 host_item *hi;
436 for (hi = two; hi != end_two->next; hi = hi->next)
437 if (Ustrcmp(one->name, hi->name) == 0) break;
438 if (hi == end_two->next) return FALSE;
439 if (one == end_one) break;
440 one = one->next;
441 }
442
443 /* All the hosts in the 'one' sequence were found in the 'two' sequence.
444 Ensure both are pointing at the last host, and carry on as for equality. */
445
446 two = end_two;
447 }
448
449 /* Hosts matched */
450
451 one = one->next;
452 two = two->next;
453 }
454
455 /* True if both are NULL */
456
457 return (one == two);
458 }
459
460
461
462 /*************************************************
463 * Compare header lines *
464 *************************************************/
465
466 /* This function is given two pointers to chains of header items, and it yields
467 TRUE if they are the same header texts in the same order.
468
469 Arguments:
470 one points to the first header list
471 two points to the second header list
472
473 Returns: TRUE if the lists refer to the same header set
474 */
475
476 static BOOL
477 same_headers(header_line *one, header_line *two)
478 {
479 for (;;)
480 {
481 if (one == two) return TRUE; /* Includes the case where both NULL */
482 if (one == NULL || two == NULL) return FALSE;
483 if (Ustrcmp(one->text, two->text) != 0) return FALSE;
484 one = one->next;
485 two = two->next;
486 }
487 }
488
489
490
491 /*************************************************
492 * Compare string settings *
493 *************************************************/
494
495 /* This function is given two pointers to strings, and it returns
496 TRUE if they are the same pointer, or if the two strings are the same.
497
498 Arguments:
499 one points to the first string
500 two points to the second string
501
502 Returns: TRUE or FALSE
503 */
504
505 static BOOL
506 same_strings(uschar *one, uschar *two)
507 {
508 if (one == two) return TRUE; /* Includes the case where both NULL */
509 if (one == NULL || two == NULL) return FALSE;
510 return (Ustrcmp(one, two) == 0);
511 }
512
513
514
515 /*************************************************
516 * Compare uid/gid for addresses *
517 *************************************************/
518
519 /* This function is given a transport and two addresses. It yields TRUE if the
520 uid/gid/initgroups settings for the two addresses are going to be the same when
521 they are delivered.
522
523 Arguments:
524 tp the transort
525 addr1 the first address
526 addr2 the second address
527
528 Returns: TRUE or FALSE
529 */
530
531 static BOOL
532 same_ugid(transport_instance *tp, address_item *addr1, address_item *addr2)
533 {
534 if (!tp->uid_set && tp->expand_uid == NULL && !tp->deliver_as_creator)
535 {
536 if (testflag(addr1, af_uid_set) != testflag(addr2, af_gid_set) ||
537 (testflag(addr1, af_uid_set) &&
538 (addr1->uid != addr2->uid ||
539 testflag(addr1, af_initgroups) != testflag(addr2, af_initgroups))))
540 return FALSE;
541 }
542
543 if (!tp->gid_set && tp->expand_gid == NULL)
544 {
545 if (testflag(addr1, af_gid_set) != testflag(addr2, af_gid_set) ||
546 (testflag(addr1, af_gid_set) && addr1->gid != addr2->gid))
547 return FALSE;
548 }
549
550 return TRUE;
551 }
552
553
554
555
556 /*************************************************
557 * Record that an address is complete *
558 *************************************************/
559
560 /* This function records that an address is complete. This is straightforward
561 for most addresses, where the unique address is just the full address with the
562 domain lower cased. For homonyms (addresses that are the same as one of their
563 ancestors) their are complications. Their unique addresses have \x\ prepended
564 (where x = 0, 1, 2...), so that de-duplication works correctly for siblings and
565 cousins.
566
567 Exim used to record the unique addresses of homonyms as "complete". This,
568 however, fails when the pattern of redirection varies over time (e.g. if taking
569 unseen copies at only some times of day) because the prepended numbers may vary
570 from one delivery run to the next. This problem is solved by never recording
571 prepended unique addresses as complete. Instead, when a homonymic address has
572 actually been delivered via a transport, we record its basic unique address
573 followed by the name of the transport. This is checked in subsequent delivery
574 runs whenever an address is routed to a transport.
575
576 If the completed address is a top-level one (has no parent, which means it
577 cannot be homonymic) we also add the original address to the non-recipients
578 tree, so that it gets recorded in the spool file and therefore appears as
579 "done" in any spool listings. The original address may differ from the unique
580 address in the case of the domain.
581
582 Finally, this function scans the list of duplicates, marks as done any that
583 match this address, and calls child_done() for their ancestors.
584
585 Arguments:
586 addr address item that has been completed
587 now current time as a string
588
589 Returns: nothing
590 */
591
592 static void
593 address_done(address_item *addr, uschar *now)
594 {
595 address_item *dup;
596
597 update_spool = TRUE; /* Ensure spool gets updated */
598
599 /* Top-level address */
600
601 if (addr->parent == NULL)
602 {
603 tree_add_nonrecipient(addr->unique);
604 tree_add_nonrecipient(addr->address);
605 }
606
607 /* Homonymous child address */
608
609 else if (testflag(addr, af_homonym))
610 {
611 if (addr->transport != NULL)
612 {
613 tree_add_nonrecipient(
614 string_sprintf("%s/%s", addr->unique + 3, addr->transport->name));
615 }
616 }
617
618 /* Non-homonymous child address */
619
620 else tree_add_nonrecipient(addr->unique);
621
622 /* Check the list of duplicate addresses and ensure they are now marked
623 done as well. */
624
625 for (dup = addr_duplicate; dup != NULL; dup = dup->next)
626 {
627 if (Ustrcmp(addr->unique, dup->unique) == 0)
628 {
629 tree_add_nonrecipient(dup->unique);
630 child_done(dup, now);
631 }
632 }
633 }
634
635
636
637
638 /*************************************************
639 * Decrease counts in parents and mark done *
640 *************************************************/
641
642 /* This function is called when an address is complete. If there is a parent
643 address, its count of children is decremented. If there are still other
644 children outstanding, the function exits. Otherwise, if the count has become
645 zero, address_done() is called to mark the parent and its duplicates complete.
646 Then loop for any earlier ancestors.
647
648 Arguments:
649 addr points to the completed address item
650 now the current time as a string, for writing to the message log
651
652 Returns: nothing
653 */
654
655 static void
656 child_done(address_item *addr, uschar *now)
657 {
658 address_item *aa;
659 while (addr->parent != NULL)
660 {
661 addr = addr->parent;
662 if ((addr->child_count -= 1) > 0) return; /* Incomplete parent */
663 address_done(addr, now);
664
665 /* Log the completion of all descendents only when there is no ancestor with
666 the same original address. */
667
668 for (aa = addr->parent; aa != NULL; aa = aa->parent)
669 if (Ustrcmp(aa->address, addr->address) == 0) break;
670 if (aa != NULL) continue;
671
672 deliver_msglog("%s %s: children all complete\n", now, addr->address);
673 DEBUG(D_deliver) debug_printf("%s: children all complete\n", addr->address);
674 }
675 }
676
677
678
679
680 static uschar *
681 d_hostlog(uschar * s, int * sizep, int * ptrp, address_item * addr)
682 {
683 s = string_append(s, sizep, ptrp, 5, US" H=", addr->host_used->name,
684 US" [", addr->host_used->address, US"]");
685 if ((log_extra_selector & LX_outgoing_port) != 0)
686 s = string_append(s, sizep, ptrp, 2, US":", string_sprintf("%d",
687 addr->host_used->port));
688 return s;
689 }
690
691 #ifdef SUPPORT_TLS
692 static uschar *
693 d_tlslog(uschar * s, int * sizep, int * ptrp, address_item * addr)
694 {
695 if ((log_extra_selector & LX_tls_cipher) != 0 && addr->cipher != NULL)
696 s = string_append(s, sizep, ptrp, 2, US" X=", addr->cipher);
697 if ((log_extra_selector & LX_tls_certificate_verified) != 0 &&
698 addr->cipher != NULL)
699 s = string_append(s, sizep, ptrp, 2, US" CV=",
700 testflag(addr, af_cert_verified)? "yes":"no");
701 if ((log_extra_selector & LX_tls_peerdn) != 0 && addr->peerdn != NULL)
702 s = string_append(s, sizep, ptrp, 3, US" DN=\"",
703 string_printing(addr->peerdn), US"\"");
704 return s;
705 }
706 #endif
707
708 /* If msg is NULL this is a delivery log and logchar is used. Otherwise
709 this is a nonstandard call; no two-character delivery flag is written
710 but sender-host and sender are prefixed and "msg" is inserted in the log line.
711
712 Arguments:
713 flags passed to log_write()
714 */
715 void
716 delivery_log(int flags, address_item * addr, int logchar, uschar * msg)
717 {
718 uschar *log_address;
719 int size = 256; /* Used for a temporary, */
720 int ptr = 0; /* expanding buffer, for */
721 uschar *s; /* building log lines; */
722 void *reset_point; /* released afterwards. */
723
724
725 /* Log the delivery on the main log. We use an extensible string to build up
726 the log line, and reset the store afterwards. Remote deliveries should always
727 have a pointer to the host item that succeeded; local deliveries can have a
728 pointer to a single host item in their host list, for use by the transport. */
729
730 #ifdef EXPERIMENTAL_TPDA
731 tpda_delivery_ip = NULL; /* presume no successful remote delivery */
732 tpda_delivery_port = 0;
733 tpda_delivery_fqdn = NULL;
734 tpda_delivery_local_part = NULL;
735 tpda_delivery_domain = NULL;
736 tpda_delivery_confirmation = NULL;
737 lookup_dnssec_authenticated = NULL;
738 #endif
739
740 s = reset_point = store_get(size);
741
742 log_address = string_log_address(addr, (log_write_selector & L_all_parents) != 0, TRUE);
743 if (msg)
744 s = string_append(s, &size, &ptr, 3, host_and_ident(TRUE), US" ", log_address);
745 else
746 {
747 s[ptr++] = logchar;
748 s = string_append(s, &size, &ptr, 2, US"> ", log_address);
749 }
750
751 if ((log_extra_selector & LX_sender_on_delivery) != 0 || msg)
752 s = string_append(s, &size, &ptr, 3, US" F=<", sender_address, US">");
753
754 #ifdef EXPERIMENTAL_SRS
755 if(addr->p.srs_sender)
756 s = string_append(s, &size, &ptr, 3, US" SRS=<", addr->p.srs_sender, US">");
757 #endif
758
759 /* You might think that the return path must always be set for a successful
760 delivery; indeed, I did for some time, until this statement crashed. The case
761 when it is not set is for a delivery to /dev/null which is optimised by not
762 being run at all. */
763
764 if (used_return_path != NULL &&
765 (log_extra_selector & LX_return_path_on_delivery) != 0)
766 s = string_append(s, &size, &ptr, 3, US" P=<", used_return_path, US">");
767
768 if (msg)
769 s = string_append(s, &size, &ptr, 2, US" ", msg);
770
771 /* For a delivery from a system filter, there may not be a router */
772 if (addr->router != NULL)
773 s = string_append(s, &size, &ptr, 2, US" R=", addr->router->name);
774
775 s = string_append(s, &size, &ptr, 2, US" T=", addr->transport->name);
776
777 if ((log_extra_selector & LX_delivery_size) != 0)
778 s = string_append(s, &size, &ptr, 2, US" S=",
779 string_sprintf("%d", transport_count));
780
781 /* Local delivery */
782
783 if (addr->transport->info->local)
784 {
785 if (addr->host_list != NULL)
786 {
787 s = string_append(s, &size, &ptr, 2, US" H=", addr->host_list->name);
788 #ifdef EXPERIMENTAL_TPDA
789 tpda_delivery_fqdn = addr->host_list->name;
790 #endif
791 }
792 if (addr->shadow_message != NULL)
793 s = string_cat(s, &size, &ptr, addr->shadow_message,
794 Ustrlen(addr->shadow_message));
795 }
796
797 /* Remote delivery */
798
799 else
800 {
801 if (addr->host_used)
802 {
803 s = d_hostlog(s, &size, &ptr, addr);
804 if (continue_sequence > 1)
805 s = string_cat(s, &size, &ptr, US"*", 1);
806
807 #ifdef EXPERIMENTAL_TPDA
808 tpda_delivery_ip = addr->host_used->address;
809 tpda_delivery_port = addr->host_used->port;
810 tpda_delivery_fqdn = addr->host_used->name;
811 tpda_delivery_local_part = addr->local_part;
812 tpda_delivery_domain = addr->domain;
813 tpda_delivery_confirmation = addr->message;
814
815 /* DNS lookup status */
816 lookup_dnssec_authenticated = addr->host_used->dnssec==DS_YES ? US"yes"
817 : addr->host_used->dnssec==DS_NO ? US"no"
818 : NULL;
819 #endif
820 }
821
822 #ifdef SUPPORT_TLS
823 s = d_tlslog(s, &size, &ptr, addr);
824 #endif
825
826 if (addr->authenticator)
827 {
828 s = string_append(s, &size, &ptr, 2, US" A=", addr->authenticator);
829 if (addr->auth_id)
830 {
831 s = string_append(s, &size, &ptr, 2, US":", addr->auth_id);
832 if (log_extra_selector & LX_smtp_mailauth && addr->auth_sndr)
833 s = string_append(s, &size, &ptr, 2, US":", addr->auth_sndr);
834 }
835 }
836
837 #ifndef DISABLE_PRDR
838 if (addr->flags & af_prdr_used)
839 s = string_append(s, &size, &ptr, 1, US" PRDR");
840 #endif
841 }
842
843 /* confirmation message (SMTP (host_used) and LMTP (driver_name)) */
844
845 if ((log_extra_selector & LX_smtp_confirmation) != 0 &&
846 addr->message != NULL &&
847 ((addr->host_used != NULL) || (Ustrcmp(addr->transport->driver_name, "lmtp") == 0)))
848 {
849 int i;
850 uschar *p = big_buffer;
851 uschar *ss = addr->message;
852 *p++ = '\"';
853 for (i = 0; i < 100 && ss[i] != 0; i++)
854 {
855 if (ss[i] == '\"' || ss[i] == '\\') *p++ = '\\';
856 *p++ = ss[i];
857 }
858 *p++ = '\"';
859 *p = 0;
860 s = string_append(s, &size, &ptr, 2, US" C=", big_buffer);
861 }
862
863 /* Time on queue and actual time taken to deliver */
864
865 if ((log_extra_selector & LX_queue_time) != 0)
866 {
867 s = string_append(s, &size, &ptr, 2, US" QT=",
868 readconf_printtime(time(NULL) - received_time));
869 }
870
871 if ((log_extra_selector & LX_deliver_time) != 0)
872 {
873 s = string_append(s, &size, &ptr, 2, US" DT=",
874 readconf_printtime(addr->more_errno));
875 }
876
877 /* string_cat() always leaves room for the terminator. Release the
878 store we used to build the line after writing it. */
879
880 s[ptr] = 0;
881 log_write(0, flags, "%s", s);
882
883 #ifdef EXPERIMENTAL_TPDA
884 if (addr->transport->tpda_delivery_action)
885 {
886 DEBUG(D_deliver)
887 debug_printf(" TPDA(Delivery): tpda_deliver_action=|%s| tpda_delivery_IP=%s\n",
888 addr->transport->tpda_delivery_action, tpda_delivery_ip);
889
890 router_name = addr->router->name;
891 transport_name = addr->transport->name;
892 if (!expand_string(addr->transport->tpda_delivery_action) && *expand_string_message)
893 log_write(0, LOG_MAIN|LOG_PANIC, "failed to expand tpda_deliver_action in %s: %s\n",
894 transport_name, expand_string_message);
895 router_name = NULL;
896 transport_name = NULL;
897 }
898 #endif
899 store_reset(reset_point);
900 return;
901 }
902
903
904
905 /*************************************************
906 * Actions at the end of handling an address *
907 *************************************************/
908
909 /* This is a function for processing a single address when all that can be done
910 with it has been done.
911
912 Arguments:
913 addr points to the address block
914 result the result of the delivery attempt
915 logflags flags for log_write() (LOG_MAIN and/or LOG_PANIC)
916 driver_type indicates which type of driver (transport, or router) was last
917 to process the address
918 logchar '=' or '-' for use when logging deliveries with => or ->
919
920 Returns: nothing
921 */
922
923 static void
924 post_process_one(address_item *addr, int result, int logflags, int driver_type,
925 int logchar)
926 {
927 uschar *now = tod_stamp(tod_log);
928 uschar *driver_kind = NULL;
929 uschar *driver_name = NULL;
930 uschar *log_address;
931
932 int size = 256; /* Used for a temporary, */
933 int ptr = 0; /* expanding buffer, for */
934 uschar *s; /* building log lines; */
935 void *reset_point; /* released afterwards. */
936
937
938 DEBUG(D_deliver) debug_printf("post-process %s (%d)\n", addr->address, result);
939
940 /* Set up driver kind and name for logging. Disable logging if the router or
941 transport has disabled it. */
942
943 if (driver_type == DTYPE_TRANSPORT)
944 {
945 if (addr->transport != NULL)
946 {
947 driver_name = addr->transport->name;
948 driver_kind = US" transport";
949 disable_logging = addr->transport->disable_logging;
950 }
951 else driver_kind = US"transporting";
952 }
953 else if (driver_type == DTYPE_ROUTER)
954 {
955 if (addr->router != NULL)
956 {
957 driver_name = addr->router->name;
958 driver_kind = US" router";
959 disable_logging = addr->router->disable_logging;
960 }
961 else driver_kind = US"routing";
962 }
963
964 /* If there's an error message set, ensure that it contains only printing
965 characters - it should, but occasionally things slip in and this at least
966 stops the log format from getting wrecked. We also scan the message for an LDAP
967 expansion item that has a password setting, and flatten the password. This is a
968 fudge, but I don't know a cleaner way of doing this. (If the item is badly
969 malformed, it won't ever have gone near LDAP.) */
970
971 if (addr->message != NULL)
972 {
973 addr->message = string_printing(addr->message);
974 if (((Ustrstr(addr->message, "failed to expand") != NULL) || (Ustrstr(addr->message, "expansion of ") != NULL)) &&
975 (Ustrstr(addr->message, "mysql") != NULL ||
976 Ustrstr(addr->message, "pgsql") != NULL ||
977 #ifdef EXPERIMENTAL_REDIS
978 Ustrstr(addr->message, "redis") != NULL ||
979 #endif
980 Ustrstr(addr->message, "sqlite") != NULL ||
981 Ustrstr(addr->message, "ldap:") != NULL ||
982 Ustrstr(addr->message, "ldapdn:") != NULL ||
983 Ustrstr(addr->message, "ldapm:") != NULL))
984 {
985 addr->message = string_sprintf("Temporary internal error");
986 }
987 }
988
989 /* If we used a transport that has one of the "return_output" options set, and
990 if it did in fact generate some output, then for return_output we treat the
991 message as failed if it was not already set that way, so that the output gets
992 returned to the sender, provided there is a sender to send it to. For
993 return_fail_output, do this only if the delivery failed. Otherwise we just
994 unlink the file, and remove the name so that if the delivery failed, we don't
995 try to send back an empty or unwanted file. The log_output options operate only
996 on a non-empty file.
997
998 In any case, we close the message file, because we cannot afford to leave a
999 file-descriptor for one address while processing (maybe very many) others. */
1000
1001 if (addr->return_file >= 0 && addr->return_filename != NULL)
1002 {
1003 BOOL return_output = FALSE;
1004 struct stat statbuf;
1005 (void)EXIMfsync(addr->return_file);
1006
1007 /* If there is no output, do nothing. */
1008
1009 if (fstat(addr->return_file, &statbuf) == 0 && statbuf.st_size > 0)
1010 {
1011 transport_instance *tb = addr->transport;
1012
1013 /* Handle logging options */
1014
1015 if (tb->log_output || (result == FAIL && tb->log_fail_output) ||
1016 (result == DEFER && tb->log_defer_output))
1017 {
1018 uschar *s;
1019 FILE *f = Ufopen(addr->return_filename, "rb");
1020 if (f == NULL)
1021 log_write(0, LOG_MAIN|LOG_PANIC, "failed to open %s to log output "
1022 "from %s transport: %s", addr->return_filename, tb->name,
1023 strerror(errno));
1024 else
1025 {
1026 s = US Ufgets(big_buffer, big_buffer_size, f);
1027 if (s != NULL)
1028 {
1029 uschar *p = big_buffer + Ustrlen(big_buffer);
1030 while (p > big_buffer && isspace(p[-1])) p--;
1031 *p = 0;
1032 s = string_printing(big_buffer);
1033 log_write(0, LOG_MAIN, "<%s>: %s transport output: %s",
1034 addr->address, tb->name, s);
1035 }
1036 (void)fclose(f);
1037 }
1038 }
1039
1040 /* Handle returning options, but only if there is an address to return
1041 the text to. */
1042
1043 if (sender_address[0] != 0 || addr->p.errors_address != NULL)
1044 {
1045 if (tb->return_output)
1046 {
1047 addr->transport_return = result = FAIL;
1048 if (addr->basic_errno == 0 && addr->message == NULL)
1049 addr->message = US"return message generated";
1050 return_output = TRUE;
1051 }
1052 else
1053 if (tb->return_fail_output && result == FAIL) return_output = TRUE;
1054 }
1055 }
1056
1057 /* Get rid of the file unless it might be returned, but close it in
1058 all cases. */
1059
1060 if (!return_output)
1061 {
1062 Uunlink(addr->return_filename);
1063 addr->return_filename = NULL;
1064 addr->return_file = -1;
1065 }
1066
1067 (void)close(addr->return_file);
1068 }
1069
1070 /* The success case happens only after delivery by a transport. */
1071
1072 if (result == OK)
1073 {
1074 addr->next = addr_succeed;
1075 addr_succeed = addr;
1076
1077 /* Call address_done() to ensure that we don't deliver to this address again,
1078 and write appropriate things to the message log. If it is a child address, we
1079 call child_done() to scan the ancestors and mark them complete if this is the
1080 last child to complete. */
1081
1082 address_done(addr, now);
1083 DEBUG(D_deliver) debug_printf("%s delivered\n", addr->address);
1084
1085 if (addr->parent == NULL)
1086 deliver_msglog("%s %s: %s%s succeeded\n", now, addr->address,
1087 driver_name, driver_kind);
1088 else
1089 {
1090 deliver_msglog("%s %s <%s>: %s%s succeeded\n", now, addr->address,
1091 addr->parent->address, driver_name, driver_kind);
1092 child_done(addr, now);
1093 }
1094
1095 /* Certificates for logging (via TPDA) */
1096 #ifdef SUPPORT_TLS
1097 tls_out.ourcert = addr->ourcert;
1098 addr->ourcert = NULL;
1099 tls_out.peercert = addr->peercert;
1100 addr->peercert = NULL;
1101
1102 tls_out.cipher = addr->cipher;
1103 tls_out.peerdn = addr->peerdn;
1104 tls_out.ocsp = addr->ocsp;
1105 #endif
1106
1107 delivery_log(LOG_MAIN, addr, logchar, NULL);
1108
1109 #ifdef SUPPORT_TLS
1110 if (tls_out.ourcert)
1111 {
1112 tls_free_cert(tls_out.ourcert);
1113 tls_out.ourcert = NULL;
1114 }
1115 if (tls_out.peercert)
1116 {
1117 tls_free_cert(tls_out.peercert);
1118 tls_out.peercert = NULL;
1119 }
1120 tls_out.cipher = NULL;
1121 tls_out.peerdn = NULL;
1122 tls_out.ocsp = OCSP_NOT_REQ;
1123 #endif
1124 }
1125
1126
1127 /* Soft failure, or local delivery process failed; freezing may be
1128 requested. */
1129
1130 else if (result == DEFER || result == PANIC)
1131 {
1132 if (result == PANIC) logflags |= LOG_PANIC;
1133
1134 /* This puts them on the chain in reverse order. Do not change this, because
1135 the code for handling retries assumes that the one with the retry
1136 information is last. */
1137
1138 addr->next = addr_defer;
1139 addr_defer = addr;
1140
1141 /* The only currently implemented special action is to freeze the
1142 message. Logging of this is done later, just before the -H file is
1143 updated. */
1144
1145 if (addr->special_action == SPECIAL_FREEZE)
1146 {
1147 deliver_freeze = TRUE;
1148 deliver_frozen_at = time(NULL);
1149 update_spool = TRUE;
1150 }
1151
1152 /* If doing a 2-stage queue run, we skip writing to either the message
1153 log or the main log for SMTP defers. */
1154
1155 if (!queue_2stage || addr->basic_errno != 0)
1156 {
1157 uschar ss[32];
1158
1159 /* For errors of the type "retry time not reached" (also remotes skipped
1160 on queue run), logging is controlled by L_retry_defer. Note that this kind
1161 of error number is negative, and all the retry ones are less than any
1162 others. */
1163
1164 unsigned int use_log_selector = (addr->basic_errno <= ERRNO_RETRY_BASE)?
1165 L_retry_defer : 0;
1166
1167 /* Build up the line that is used for both the message log and the main
1168 log. */
1169
1170 s = reset_point = store_get(size);
1171
1172 /* Create the address string for logging. Must not do this earlier, because
1173 an OK result may be changed to FAIL when a pipe returns text. */
1174
1175 log_address = string_log_address(addr,
1176 (log_write_selector & L_all_parents) != 0, result == OK);
1177
1178 s = string_cat(s, &size, &ptr, log_address, Ustrlen(log_address));
1179
1180 /* Either driver_name contains something and driver_kind contains
1181 " router" or " transport" (note the leading space), or driver_name is
1182 a null string and driver_kind contains "routing" without the leading
1183 space, if all routing has been deferred. When a domain has been held,
1184 so nothing has been done at all, both variables contain null strings. */
1185
1186 if (driver_name == NULL)
1187 {
1188 if (driver_kind != NULL)
1189 s = string_append(s, &size, &ptr, 2, US" ", driver_kind);
1190 }
1191 else
1192 {
1193 if (driver_kind[1] == 't' && addr->router != NULL)
1194 s = string_append(s, &size, &ptr, 2, US" R=", addr->router->name);
1195 Ustrcpy(ss, " ?=");
1196 ss[1] = toupper(driver_kind[1]);
1197 s = string_append(s, &size, &ptr, 2, ss, driver_name);
1198 }
1199
1200 sprintf(CS ss, " defer (%d)", addr->basic_errno);
1201 s = string_cat(s, &size, &ptr, ss, Ustrlen(ss));
1202
1203 if (addr->basic_errno > 0)
1204 s = string_append(s, &size, &ptr, 2, US": ",
1205 US strerror(addr->basic_errno));
1206
1207 if (addr->message != NULL)
1208 s = string_append(s, &size, &ptr, 2, US": ", addr->message);
1209
1210 s[ptr] = 0;
1211
1212 /* Log the deferment in the message log, but don't clutter it
1213 up with retry-time defers after the first delivery attempt. */
1214
1215 if (deliver_firsttime || addr->basic_errno > ERRNO_RETRY_BASE)
1216 deliver_msglog("%s %s\n", now, s);
1217
1218 /* Write the main log and reset the store */
1219
1220 log_write(use_log_selector, logflags, "== %s", s);
1221 store_reset(reset_point);
1222 }
1223 }
1224
1225
1226 /* Hard failure. If there is an address to which an error message can be sent,
1227 put this address on the failed list. If not, put it on the deferred list and
1228 freeze the mail message for human attention. The latter action can also be
1229 explicitly requested by a router or transport. */
1230
1231 else
1232 {
1233 /* If this is a delivery error, or a message for which no replies are
1234 wanted, and the message's age is greater than ignore_bounce_errors_after,
1235 force the af_ignore_error flag. This will cause the address to be discarded
1236 later (with a log entry). */
1237
1238 if (sender_address[0] == 0 && message_age >= ignore_bounce_errors_after)
1239 setflag(addr, af_ignore_error);
1240
1241 /* Freeze the message if requested, or if this is a bounce message (or other
1242 message with null sender) and this address does not have its own errors
1243 address. However, don't freeze if errors are being ignored. The actual code
1244 to ignore occurs later, instead of sending a message. Logging of freezing
1245 occurs later, just before writing the -H file. */
1246
1247 if (!testflag(addr, af_ignore_error) &&
1248 (addr->special_action == SPECIAL_FREEZE ||
1249 (sender_address[0] == 0 && addr->p.errors_address == NULL)
1250 ))
1251 {
1252 frozen_info = (addr->special_action == SPECIAL_FREEZE)? US"" :
1253 (sender_local && !local_error_message)?
1254 US" (message created with -f <>)" : US" (delivery error message)";
1255 deliver_freeze = TRUE;
1256 deliver_frozen_at = time(NULL);
1257 update_spool = TRUE;
1258
1259 /* The address is put on the defer rather than the failed queue, because
1260 the message is being retained. */
1261
1262 addr->next = addr_defer;
1263 addr_defer = addr;
1264 }
1265
1266 /* Don't put the address on the nonrecipients tree yet; wait until an
1267 error message has been successfully sent. */
1268
1269 else
1270 {
1271 addr->next = addr_failed;
1272 addr_failed = addr;
1273 }
1274
1275 /* Build up the log line for the message and main logs */
1276
1277 s = reset_point = store_get(size);
1278
1279 /* Create the address string for logging. Must not do this earlier, because
1280 an OK result may be changed to FAIL when a pipe returns text. */
1281
1282 log_address = string_log_address(addr,
1283 (log_write_selector & L_all_parents) != 0, result == OK);
1284
1285 s = string_cat(s, &size, &ptr, log_address, Ustrlen(log_address));
1286
1287 if ((log_extra_selector & LX_sender_on_delivery) != 0)
1288 s = string_append(s, &size, &ptr, 3, US" F=<", sender_address, US">");
1289
1290 /* Return path may not be set if no delivery actually happened */
1291
1292 if (used_return_path != NULL &&
1293 (log_extra_selector & LX_return_path_on_delivery) != 0)
1294 s = string_append(s, &size, &ptr, 3, US" P=<", used_return_path, US">");
1295
1296 if (addr->router != NULL)
1297 s = string_append(s, &size, &ptr, 2, US" R=", addr->router->name);
1298 if (addr->transport != NULL)
1299 s = string_append(s, &size, &ptr, 2, US" T=", addr->transport->name);
1300
1301 if (addr->host_used != NULL)
1302 s = d_hostlog(s, &size, &ptr, addr);
1303
1304 #ifdef SUPPORT_TLS
1305 s = d_tlslog(s, &size, &ptr, addr);
1306 #endif
1307
1308 if (addr->basic_errno > 0)
1309 s = string_append(s, &size, &ptr, 2, US": ",
1310 US strerror(addr->basic_errno));
1311
1312 if (addr->message != NULL)
1313 s = string_append(s, &size, &ptr, 2, US": ", addr->message);
1314
1315 s[ptr] = 0;
1316
1317 /* Do the logging. For the message log, "routing failed" for those cases,
1318 just to make it clearer. */
1319
1320 if (driver_name == NULL)
1321 deliver_msglog("%s %s failed for %s\n", now, driver_kind, s);
1322 else
1323 deliver_msglog("%s %s\n", now, s);
1324
1325 log_write(0, LOG_MAIN, "** %s", s);
1326 store_reset(reset_point);
1327 }
1328
1329 /* Ensure logging is turned on again in all cases */
1330
1331 disable_logging = FALSE;
1332 }
1333
1334
1335
1336
1337 /*************************************************
1338 * Address-independent error *
1339 *************************************************/
1340
1341 /* This function is called when there's an error that is not dependent on a
1342 particular address, such as an expansion string failure. It puts the error into
1343 all the addresses in a batch, logs the incident on the main and panic logs, and
1344 clears the expansions. It is mostly called from local_deliver(), but can be
1345 called for a remote delivery via findugid().
1346
1347 Arguments:
1348 logit TRUE if (MAIN+PANIC) logging required
1349 addr the first of the chain of addresses
1350 code the error code
1351 format format string for error message, or NULL if already set in addr
1352 ... arguments for the format
1353
1354 Returns: nothing
1355 */
1356
1357 static void
1358 common_error(BOOL logit, address_item *addr, int code, uschar *format, ...)
1359 {
1360 address_item *addr2;
1361 addr->basic_errno = code;
1362
1363 if (format != NULL)
1364 {
1365 va_list ap;
1366 uschar buffer[512];
1367 va_start(ap, format);
1368 if (!string_vformat(buffer, sizeof(buffer), CS format, ap))
1369 log_write(0, LOG_MAIN|LOG_PANIC_DIE,
1370 "common_error expansion was longer than " SIZE_T_FMT, sizeof(buffer));
1371 va_end(ap);
1372 addr->message = string_copy(buffer);
1373 }
1374
1375 for (addr2 = addr->next; addr2 != NULL; addr2 = addr2->next)
1376 {
1377 addr2->basic_errno = code;
1378 addr2->message = addr->message;
1379 }
1380
1381 if (logit) log_write(0, LOG_MAIN|LOG_PANIC, "%s", addr->message);
1382 deliver_set_expansions(NULL);
1383 }
1384
1385
1386
1387
1388 /*************************************************
1389 * Check a "never users" list *
1390 *************************************************/
1391
1392 /* This function is called to check whether a uid is on one of the two "never
1393 users" lists.
1394
1395 Arguments:
1396 uid the uid to be checked
1397 nusers the list to be scanned; the first item in the list is the count
1398
1399 Returns: TRUE if the uid is on the list
1400 */
1401
1402 static BOOL
1403 check_never_users(uid_t uid, uid_t *nusers)
1404 {
1405 int i;
1406 if (nusers == NULL) return FALSE;
1407 for (i = 1; i <= (int)(nusers[0]); i++) if (nusers[i] == uid) return TRUE;
1408 return FALSE;
1409 }
1410
1411
1412
1413 /*************************************************
1414 * Find uid and gid for a transport *
1415 *************************************************/
1416
1417 /* This function is called for both local and remote deliveries, to find the
1418 uid/gid under which to run the delivery. The values are taken preferentially
1419 from the transport (either explicit or deliver_as_creator), then from the
1420 address (i.e. the router), and if nothing is set, the exim uid/gid are used. If
1421 the resulting uid is on the "never_users" or the "fixed_never_users" list, a
1422 panic error is logged, and the function fails (which normally leads to delivery
1423 deferral).
1424
1425 Arguments:
1426 addr the address (possibly a chain)
1427 tp the transport
1428 uidp pointer to uid field
1429 gidp pointer to gid field
1430 igfp pointer to the use_initgroups field
1431
1432 Returns: FALSE if failed - error has been set in address(es)
1433 */
1434
1435 static BOOL
1436 findugid(address_item *addr, transport_instance *tp, uid_t *uidp, gid_t *gidp,
1437 BOOL *igfp)
1438 {
1439 uschar *nuname = NULL;
1440 BOOL gid_set = FALSE;
1441
1442 /* Default initgroups flag comes from the transport */
1443
1444 *igfp = tp->initgroups;
1445
1446 /* First see if there's a gid on the transport, either fixed or expandable.
1447 The expanding function always logs failure itself. */
1448
1449 if (tp->gid_set)
1450 {
1451 *gidp = tp->gid;
1452 gid_set = TRUE;
1453 }
1454 else if (tp->expand_gid != NULL)
1455 {
1456 if (route_find_expanded_group(tp->expand_gid, tp->name, US"transport", gidp,
1457 &(addr->message))) gid_set = TRUE;
1458 else
1459 {
1460 common_error(FALSE, addr, ERRNO_GIDFAIL, NULL);
1461 return FALSE;
1462 }
1463 }
1464
1465 /* If the transport did not set a group, see if the router did. */
1466
1467 if (!gid_set && testflag(addr, af_gid_set))
1468 {
1469 *gidp = addr->gid;
1470 gid_set = TRUE;
1471 }
1472
1473 /* Pick up a uid from the transport if one is set. */
1474
1475 if (tp->uid_set) *uidp = tp->uid;
1476
1477 /* Otherwise, try for an expandable uid field. If it ends up as a numeric id,
1478 it does not provide a passwd value from which a gid can be taken. */
1479
1480 else if (tp->expand_uid != NULL)
1481 {
1482 struct passwd *pw;
1483 if (!route_find_expanded_user(tp->expand_uid, tp->name, US"transport", &pw,
1484 uidp, &(addr->message)))
1485 {
1486 common_error(FALSE, addr, ERRNO_UIDFAIL, NULL);
1487 return FALSE;
1488 }
1489 if (!gid_set && pw != NULL)
1490 {
1491 *gidp = pw->pw_gid;
1492 gid_set = TRUE;
1493 }
1494 }
1495
1496 /* If the transport doesn't set the uid, test the deliver_as_creator flag. */
1497
1498 else if (tp->deliver_as_creator)
1499 {
1500 *uidp = originator_uid;
1501 if (!gid_set)
1502 {
1503 *gidp = originator_gid;
1504 gid_set = TRUE;
1505 }
1506 }
1507
1508 /* Otherwise see if the address specifies the uid and if so, take it and its
1509 initgroups flag. */
1510
1511 else if (testflag(addr, af_uid_set))
1512 {
1513 *uidp = addr->uid;
1514 *igfp = testflag(addr, af_initgroups);
1515 }
1516
1517 /* Nothing has specified the uid - default to the Exim user, and group if the
1518 gid is not set. */
1519
1520 else
1521 {
1522 *uidp = exim_uid;
1523 if (!gid_set)
1524 {
1525 *gidp = exim_gid;
1526 gid_set = TRUE;
1527 }
1528 }
1529
1530 /* If no gid is set, it is a disaster. We default to the Exim gid only if
1531 defaulting to the Exim uid. In other words, if the configuration has specified
1532 a uid, it must also provide a gid. */
1533
1534 if (!gid_set)
1535 {
1536 common_error(TRUE, addr, ERRNO_GIDFAIL, US"User set without group for "
1537 "%s transport", tp->name);
1538 return FALSE;
1539 }
1540
1541 /* Check that the uid is not on the lists of banned uids that may not be used
1542 for delivery processes. */
1543
1544 if (check_never_users(*uidp, never_users))
1545 nuname = US"never_users";
1546 else if (check_never_users(*uidp, fixed_never_users))
1547 nuname = US"fixed_never_users";
1548
1549 if (nuname != NULL)
1550 {
1551 common_error(TRUE, addr, ERRNO_UIDFAIL, US"User %ld set for %s transport "
1552 "is on the %s list", (long int)(*uidp), tp->name, nuname);
1553 return FALSE;
1554 }
1555
1556 /* All is well */
1557
1558 return TRUE;
1559 }
1560
1561
1562
1563
1564 /*************************************************
1565 * Check the size of a message for a transport *
1566 *************************************************/
1567
1568 /* Checks that the message isn't too big for the selected transport.
1569 This is called only when it is known that the limit is set.
1570
1571 Arguments:
1572 tp the transport
1573 addr the (first) address being delivered
1574
1575 Returns: OK
1576 DEFER expansion failed or did not yield an integer
1577 FAIL message too big
1578 */
1579
1580 int
1581 check_message_size(transport_instance *tp, address_item *addr)
1582 {
1583 int rc = OK;
1584 int size_limit;
1585
1586 deliver_set_expansions(addr);
1587 size_limit = expand_string_integer(tp->message_size_limit, TRUE);
1588 deliver_set_expansions(NULL);
1589
1590 if (expand_string_message != NULL)
1591 {
1592 rc = DEFER;
1593 if (size_limit == -1)
1594 addr->message = string_sprintf("failed to expand message_size_limit "
1595 "in %s transport: %s", tp->name, expand_string_message);
1596 else
1597 addr->message = string_sprintf("invalid message_size_limit "
1598 "in %s transport: %s", tp->name, expand_string_message);
1599 }
1600 else if (size_limit > 0 && message_size > size_limit)
1601 {
1602 rc = FAIL;
1603 addr->message =
1604 string_sprintf("message is too big (transport limit = %d)",
1605 size_limit);
1606 }
1607
1608 return rc;
1609 }
1610
1611
1612
1613 /*************************************************
1614 * Transport-time check for a previous delivery *
1615 *************************************************/
1616
1617 /* Check that this base address hasn't previously been delivered to its routed
1618 transport. If it has been delivered, mark it done. The check is necessary at
1619 delivery time in order to handle homonymic addresses correctly in cases where
1620 the pattern of redirection changes between delivery attempts (so the unique
1621 fields change). Non-homonymic previous delivery is detected earlier, at routing
1622 time (which saves unnecessary routing).
1623
1624 Arguments:
1625 addr the address item
1626 testing TRUE if testing wanted only, without side effects
1627
1628 Returns: TRUE if previously delivered by the transport
1629 */
1630
1631 static BOOL
1632 previously_transported(address_item *addr, BOOL testing)
1633 {
1634 (void)string_format(big_buffer, big_buffer_size, "%s/%s",
1635 addr->unique + (testflag(addr, af_homonym)? 3:0), addr->transport->name);
1636
1637 if (tree_search(tree_nonrecipients, big_buffer) != 0)
1638 {
1639 DEBUG(D_deliver|D_route|D_transport)
1640 debug_printf("%s was previously delivered (%s transport): discarded\n",
1641 addr->address, addr->transport->name);
1642 if (!testing) child_done(addr, tod_stamp(tod_log));
1643 return TRUE;
1644 }
1645
1646 return FALSE;
1647 }
1648
1649
1650
1651 /******************************************************
1652 * Check for a given header in a header string *
1653 ******************************************************/
1654
1655 /* This function is used when generating quota warnings. The configuration may
1656 specify any header lines it likes in quota_warn_message. If certain of them are
1657 missing, defaults are inserted, so we need to be able to test for the presence
1658 of a given header.
1659
1660 Arguments:
1661 hdr the required header name
1662 hstring the header string
1663
1664 Returns: TRUE the header is in the string
1665 FALSE the header is not in the string
1666 */
1667
1668 static BOOL
1669 contains_header(uschar *hdr, uschar *hstring)
1670 {
1671 int len = Ustrlen(hdr);
1672 uschar *p = hstring;
1673 while (*p != 0)
1674 {
1675 if (strncmpic(p, hdr, len) == 0)
1676 {
1677 p += len;
1678 while (*p == ' ' || *p == '\t') p++;
1679 if (*p == ':') return TRUE;
1680 }
1681 while (*p != 0 && *p != '\n') p++;
1682 if (*p == '\n') p++;
1683 }
1684 return FALSE;
1685 }
1686
1687
1688
1689
1690 /*************************************************
1691 * Perform a local delivery *
1692 *************************************************/
1693
1694 /* Each local delivery is performed in a separate process which sets its
1695 uid and gid as specified. This is a safer way than simply changing and
1696 restoring using seteuid(); there is a body of opinion that seteuid() cannot be
1697 used safely. From release 4, Exim no longer makes any use of it. Besides, not
1698 all systems have seteuid().
1699
1700 If the uid/gid are specified in the transport_instance, they are used; the
1701 transport initialization must ensure that either both or neither are set.
1702 Otherwise, the values associated with the address are used. If neither are set,
1703 it is a configuration error.
1704
1705 The transport or the address may specify a home directory (transport over-
1706 rides), and if they do, this is set as $home. If neither have set a working
1707 directory, this value is used for that as well. Otherwise $home is left unset
1708 and the cwd is set to "/" - a directory that should be accessible to all users.
1709
1710 Using a separate process makes it more complicated to get error information
1711 back. We use a pipe to pass the return code and also an error code and error
1712 text string back to the parent process.
1713
1714 Arguments:
1715 addr points to an address block for this delivery; for "normal" local
1716 deliveries this is the only address to be delivered, but for
1717 pseudo-remote deliveries (e.g. by batch SMTP to a file or pipe)
1718 a number of addresses can be handled simultaneously, and in this
1719 case addr will point to a chain of addresses with the same
1720 characteristics.
1721
1722 shadowing TRUE if running a shadow transport; this causes output from pipes
1723 to be ignored.
1724
1725 Returns: nothing
1726 */
1727
1728 static void
1729 deliver_local(address_item *addr, BOOL shadowing)
1730 {
1731 BOOL use_initgroups;
1732 uid_t uid;
1733 gid_t gid;
1734 int status, len, rc;
1735 int pfd[2];
1736 pid_t pid;
1737 uschar *working_directory;
1738 address_item *addr2;
1739 transport_instance *tp = addr->transport;
1740
1741 /* Set up the return path from the errors or sender address. If the transport
1742 has its own return path setting, expand it and replace the existing value. */
1743
1744 if(addr->p.errors_address != NULL)
1745 return_path = addr->p.errors_address;
1746 #ifdef EXPERIMENTAL_SRS
1747 else if(addr->p.srs_sender != NULL)
1748 return_path = addr->p.srs_sender;
1749 #endif
1750 else
1751 return_path = sender_address;
1752
1753 if (tp->return_path != NULL)
1754 {
1755 uschar *new_return_path = expand_string(tp->return_path);
1756 if (new_return_path == NULL)
1757 {
1758 if (!expand_string_forcedfail)
1759 {
1760 common_error(TRUE, addr, ERRNO_EXPANDFAIL,
1761 US"Failed to expand return path \"%s\" in %s transport: %s",
1762 tp->return_path, tp->name, expand_string_message);
1763 return;
1764 }
1765 }
1766 else return_path = new_return_path;
1767 }
1768
1769 /* For local deliveries, one at a time, the value used for logging can just be
1770 set directly, once and for all. */
1771
1772 used_return_path = return_path;
1773
1774 /* Sort out the uid, gid, and initgroups flag. If an error occurs, the message
1775 gets put into the address(es), and the expansions are unset, so we can just
1776 return. */
1777
1778 if (!findugid(addr, tp, &uid, &gid, &use_initgroups)) return;
1779
1780 /* See if either the transport or the address specifies a home directory. A
1781 home directory set in the address may already be expanded; a flag is set to
1782 indicate that. In other cases we must expand it. */
1783
1784 if ((deliver_home = tp->home_dir) != NULL || /* Set in transport, or */
1785 ((deliver_home = addr->home_dir) != NULL && /* Set in address and */
1786 !testflag(addr, af_home_expanded))) /* not expanded */
1787 {
1788 uschar *rawhome = deliver_home;
1789 deliver_home = NULL; /* in case it contains $home */
1790 deliver_home = expand_string(rawhome);
1791 if (deliver_home == NULL)
1792 {
1793 common_error(TRUE, addr, ERRNO_EXPANDFAIL, US"home directory \"%s\" failed "
1794 "to expand for %s transport: %s", rawhome, tp->name,
1795 expand_string_message);
1796 return;
1797 }
1798 if (*deliver_home != '/')
1799 {
1800 common_error(TRUE, addr, ERRNO_NOTABSOLUTE, US"home directory path \"%s\" "
1801 "is not absolute for %s transport", deliver_home, tp->name);
1802 return;
1803 }
1804 }
1805
1806 /* See if either the transport or the address specifies a current directory,
1807 and if so, expand it. If nothing is set, use the home directory, unless it is
1808 also unset in which case use "/", which is assumed to be a directory to which
1809 all users have access. It is necessary to be in a visible directory for some
1810 operating systems when running pipes, as some commands (e.g. "rm" under Solaris
1811 2.5) require this. */
1812
1813 working_directory = (tp->current_dir != NULL)?
1814 tp->current_dir : addr->current_dir;
1815
1816 if (working_directory != NULL)
1817 {
1818 uschar *raw = working_directory;
1819 working_directory = expand_string(raw);
1820 if (working_directory == NULL)
1821 {
1822 common_error(TRUE, addr, ERRNO_EXPANDFAIL, US"current directory \"%s\" "
1823 "failed to expand for %s transport: %s", raw, tp->name,
1824 expand_string_message);
1825 return;
1826 }
1827 if (*working_directory != '/')
1828 {
1829 common_error(TRUE, addr, ERRNO_NOTABSOLUTE, US"current directory path "
1830 "\"%s\" is not absolute for %s transport", working_directory, tp->name);
1831 return;
1832 }
1833 }
1834 else working_directory = (deliver_home == NULL)? US"/" : deliver_home;
1835
1836 /* If one of the return_output flags is set on the transport, create and open a
1837 file in the message log directory for the transport to write its output onto.
1838 This is mainly used by pipe transports. The file needs to be unique to the
1839 address. This feature is not available for shadow transports. */
1840
1841 if (!shadowing && (tp->return_output || tp->return_fail_output ||
1842 tp->log_output || tp->log_fail_output))
1843 {
1844 uschar *error;
1845 addr->return_filename =
1846 string_sprintf("%s/msglog/%s/%s-%d-%d", spool_directory, message_subdir,
1847 message_id, getpid(), return_count++);
1848 addr->return_file = open_msglog_file(addr->return_filename, 0400, &error);
1849 if (addr->return_file < 0)
1850 {
1851 common_error(TRUE, addr, errno, US"Unable to %s file for %s transport "
1852 "to return message: %s", error, tp->name, strerror(errno));
1853 return;
1854 }
1855 }
1856
1857 /* Create the pipe for inter-process communication. */
1858
1859 if (pipe(pfd) != 0)
1860 {
1861 common_error(TRUE, addr, ERRNO_PIPEFAIL, US"Creation of pipe failed: %s",
1862 strerror(errno));
1863 return;
1864 }
1865
1866 /* Now fork the process to do the real work in the subprocess, but first
1867 ensure that all cached resources are freed so that the subprocess starts with
1868 a clean slate and doesn't interfere with the parent process. */
1869
1870 search_tidyup();
1871
1872 if ((pid = fork()) == 0)
1873 {
1874 BOOL replicate = TRUE;
1875
1876 /* Prevent core dumps, as we don't want them in users' home directories.
1877 HP-UX doesn't have RLIMIT_CORE; I don't know how to do this in that
1878 system. Some experimental/developing systems (e.g. GNU/Hurd) may define
1879 RLIMIT_CORE but not support it in setrlimit(). For such systems, do not
1880 complain if the error is "not supported".
1881
1882 There are two scenarios where changing the max limit has an effect. In one,
1883 the user is using a .forward and invoking a command of their choice via pipe;
1884 for these, we do need the max limit to be 0 unless the admin chooses to
1885 permit an increased limit. In the other, the command is invoked directly by
1886 the transport and is under administrator control, thus being able to raise
1887 the limit aids in debugging. So there's no general always-right answer.
1888
1889 Thus we inhibit core-dumps completely but let individual transports, while
1890 still root, re-raise the limits back up to aid debugging. We make the
1891 default be no core-dumps -- few enough people can use core dumps in
1892 diagnosis that it's reasonable to make them something that has to be explicitly requested.
1893 */
1894
1895 #ifdef RLIMIT_CORE
1896 struct rlimit rl;
1897 rl.rlim_cur = 0;
1898 rl.rlim_max = 0;
1899 if (setrlimit(RLIMIT_CORE, &rl) < 0)
1900 {
1901 #ifdef SETRLIMIT_NOT_SUPPORTED
1902 if (errno != ENOSYS && errno != ENOTSUP)
1903 #endif
1904 log_write(0, LOG_MAIN|LOG_PANIC, "setrlimit(RLIMIT_CORE) failed: %s",
1905 strerror(errno));
1906 }
1907 #endif
1908
1909 /* Reset the random number generator, so different processes don't all
1910 have the same sequence. */
1911
1912 random_seed = 0;
1913
1914 /* If the transport has a setup entry, call this first, while still
1915 privileged. (Appendfile uses this to expand quota, for example, while
1916 able to read private files.) */
1917
1918 if (addr->transport->setup != NULL)
1919 {
1920 switch((addr->transport->setup)(addr->transport, addr, NULL, uid, gid,
1921 &(addr->message)))
1922 {
1923 case DEFER:
1924 addr->transport_return = DEFER;
1925 goto PASS_BACK;
1926
1927 case FAIL:
1928 addr->transport_return = PANIC;
1929 goto PASS_BACK;
1930 }
1931 }
1932
1933 /* Ignore SIGINT and SIGTERM during delivery. Also ignore SIGUSR1, as
1934 when the process becomes unprivileged, it won't be able to write to the
1935 process log. SIGHUP is ignored throughout exim, except when it is being
1936 run as a daemon. */
1937
1938 signal(SIGINT, SIG_IGN);
1939 signal(SIGTERM, SIG_IGN);
1940 signal(SIGUSR1, SIG_IGN);
1941
1942 /* Close the unwanted half of the pipe, and set close-on-exec for the other
1943 half - for transports that exec things (e.g. pipe). Then set the required
1944 gid/uid. */
1945
1946 (void)close(pfd[pipe_read]);
1947 (void)fcntl(pfd[pipe_write], F_SETFD, fcntl(pfd[pipe_write], F_GETFD) |
1948 FD_CLOEXEC);
1949 exim_setugid(uid, gid, use_initgroups,
1950 string_sprintf("local delivery to %s <%s> transport=%s", addr->local_part,
1951 addr->address, addr->transport->name));
1952
1953 DEBUG(D_deliver)
1954 {
1955 address_item *batched;
1956 debug_printf(" home=%s current=%s\n", deliver_home, working_directory);
1957 for (batched = addr->next; batched != NULL; batched = batched->next)
1958 debug_printf("additional batched address: %s\n", batched->address);
1959 }
1960
1961 /* Set an appropriate working directory. */
1962
1963 if (Uchdir(working_directory) < 0)
1964 {
1965 addr->transport_return = DEFER;
1966 addr->basic_errno = errno;
1967 addr->message = string_sprintf("failed to chdir to %s", working_directory);
1968 }
1969
1970 /* If successful, call the transport */
1971
1972 else
1973 {
1974 BOOL ok = TRUE;
1975 set_process_info("delivering %s to %s using %s", message_id,
1976 addr->local_part, addr->transport->name);
1977
1978 /* Setting this global in the subprocess means we need never clear it */
1979 transport_name = addr->transport->name;
1980
1981 /* If a transport filter has been specified, set up its argument list.
1982 Any errors will get put into the address, and FALSE yielded. */
1983
1984 if (addr->transport->filter_command != NULL)
1985 {
1986 ok = transport_set_up_command(&transport_filter_argv,
1987 addr->transport->filter_command,
1988 TRUE, PANIC, addr, US"transport filter", NULL);
1989 transport_filter_timeout = addr->transport->filter_timeout;
1990 }
1991 else transport_filter_argv = NULL;
1992
1993 if (ok)
1994 {
1995 debug_print_string(addr->transport->debug_string);
1996 replicate = !(addr->transport->info->code)(addr->transport, addr);
1997 }
1998 }
1999
2000 /* Pass the results back down the pipe. If necessary, first replicate the
2001 status in the top address to the others in the batch. The label is the
2002 subject of a goto when a call to the transport's setup function fails. We
2003 pass the pointer to the transport back in case it got changed as a result of
2004 file_format in appendfile. */
2005
2006 PASS_BACK:
2007
2008 if (replicate) replicate_status(addr);
2009 for (addr2 = addr; addr2 != NULL; addr2 = addr2->next)
2010 {
2011 int i;
2012 int local_part_length = Ustrlen(addr2->local_part);
2013 uschar *s;
2014 int ret;
2015
2016 if( (ret = write(pfd[pipe_write], (void *)&(addr2->transport_return), sizeof(int))) != sizeof(int)
2017 || (ret = write(pfd[pipe_write], (void *)&transport_count, sizeof(transport_count))) != sizeof(transport_count)
2018 || (ret = write(pfd[pipe_write], (void *)&(addr2->flags), sizeof(addr2->flags))) != sizeof(addr2->flags)
2019 || (ret = write(pfd[pipe_write], (void *)&(addr2->basic_errno), sizeof(int))) != sizeof(int)
2020 || (ret = write(pfd[pipe_write], (void *)&(addr2->more_errno), sizeof(int))) != sizeof(int)
2021 || (ret = write(pfd[pipe_write], (void *)&(addr2->special_action), sizeof(int))) != sizeof(int)
2022 || (ret = write(pfd[pipe_write], (void *)&(addr2->transport),
2023 sizeof(transport_instance *))) != sizeof(transport_instance *)
2024
2025 /* For a file delivery, pass back the local part, in case the original
2026 was only part of the final delivery path. This gives more complete
2027 logging. */
2028
2029 || (testflag(addr2, af_file)
2030 && ( (ret = write(pfd[pipe_write], (void *)&local_part_length, sizeof(int))) != sizeof(int)
2031 || (ret = write(pfd[pipe_write], addr2->local_part, local_part_length)) != local_part_length
2032 )
2033 )
2034 )
2035 log_write(0, LOG_MAIN|LOG_PANIC, "Failed writing transport results to pipe: %s\n",
2036 ret == -1 ? strerror(errno) : "short write");
2037
2038 /* Now any messages */
2039
2040 for (i = 0, s = addr2->message; i < 2; i++, s = addr2->user_message)
2041 {
2042 int message_length = (s == NULL)? 0 : Ustrlen(s) + 1;
2043 if( (ret = write(pfd[pipe_write], (void *)&message_length, sizeof(int))) != sizeof(int)
2044 || (message_length > 0 && (ret = write(pfd[pipe_write], s, message_length)) != message_length)
2045 )
2046 log_write(0, LOG_MAIN|LOG_PANIC, "Failed writing transport results to pipe: %s\n",
2047 ret == -1 ? strerror(errno) : "short write");
2048 }
2049 }
2050
2051 /* OK, this process is now done. Free any cached resources that it opened,
2052 and close the pipe we were writing down before exiting. */
2053
2054 (void)close(pfd[pipe_write]);
2055 search_tidyup();
2056 exit(EXIT_SUCCESS);
2057 }
2058
2059 /* Back in the main process: panic if the fork did not succeed. This seems
2060 better than returning an error - if forking is failing it is probably best
2061 not to try other deliveries for this message. */
2062
2063 if (pid < 0)
2064 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Fork failed for local delivery to %s",
2065 addr->address);
2066
2067 /* Read the pipe to get the delivery status codes and error messages. Our copy
2068 of the writing end must be closed first, as otherwise read() won't return zero
2069 on an empty pipe. We check that a status exists for each address before
2070 overwriting the address structure. If data is missing, the default DEFER status
2071 will remain. Afterwards, close the reading end. */
2072
2073 (void)close(pfd[pipe_write]);
2074
2075 for (addr2 = addr; addr2 != NULL; addr2 = addr2->next)
2076 {
2077 len = read(pfd[pipe_read], (void *)&status, sizeof(int));
2078 if (len > 0)
2079 {
2080 int i;
2081 uschar **sptr;
2082
2083 addr2->transport_return = status;
2084 len = read(pfd[pipe_read], (void *)&transport_count,
2085 sizeof(transport_count));
2086 len = read(pfd[pipe_read], (void *)&(addr2->flags), sizeof(addr2->flags));
2087 len = read(pfd[pipe_read], (void *)&(addr2->basic_errno), sizeof(int));
2088 len = read(pfd[pipe_read], (void *)&(addr2->more_errno), sizeof(int));
2089 len = read(pfd[pipe_read], (void *)&(addr2->special_action), sizeof(int));
2090 len = read(pfd[pipe_read], (void *)&(addr2->transport),
2091 sizeof(transport_instance *));
2092
2093 if (testflag(addr2, af_file))
2094 {
2095 int local_part_length;
2096 len = read(pfd[pipe_read], (void *)&local_part_length, sizeof(int));
2097 len = read(pfd[pipe_read], (void *)big_buffer, local_part_length);
2098 big_buffer[local_part_length] = 0;
2099 addr2->local_part = string_copy(big_buffer);
2100 }
2101
2102 for (i = 0, sptr = &(addr2->message); i < 2;
2103 i++, sptr = &(addr2->user_message))
2104 {
2105 int message_length;
2106 len = read(pfd[pipe_read], (void *)&message_length, sizeof(int));
2107 if (message_length > 0)
2108 {
2109 len = read(pfd[pipe_read], (void *)big_buffer, message_length);
2110 if (len > 0) *sptr = string_copy(big_buffer);
2111 }
2112 }
2113 }
2114
2115 else
2116 {
2117 log_write(0, LOG_MAIN|LOG_PANIC, "failed to read delivery status for %s "
2118 "from delivery subprocess", addr2->unique);
2119 break;
2120 }
2121 }
2122
2123 (void)close(pfd[pipe_read]);
2124
2125 /* Unless shadowing, write all successful addresses immediately to the journal
2126 file, to ensure they are recorded asap. For homonymic addresses, use the base
2127 address plus the transport name. Failure to write the journal is panic-worthy,
2128 but don't stop, as it may prove possible subsequently to update the spool file
2129 in order to record the delivery. */
2130
2131 if (!shadowing)
2132 {
2133 for (addr2 = addr; addr2 != NULL; addr2 = addr2->next)
2134 {
2135 if (addr2->transport_return != OK) continue;
2136
2137 if (testflag(addr2, af_homonym))
2138 sprintf(CS big_buffer, "%.500s/%s\n", addr2->unique + 3, tp->name);
2139 else
2140 sprintf(CS big_buffer, "%.500s\n", addr2->unique);
2141
2142 /* In the test harness, wait just a bit to let the subprocess finish off
2143 any debug output etc first. */
2144
2145 if (running_in_test_harness) millisleep(300);
2146
2147 DEBUG(D_deliver) debug_printf("journalling %s", big_buffer);
2148 len = Ustrlen(big_buffer);
2149 if (write(journal_fd, big_buffer, len) != len)
2150 log_write(0, LOG_MAIN|LOG_PANIC, "failed to update journal for %s: %s",
2151 big_buffer, strerror(errno));
2152 }
2153
2154 /* Ensure the journal file is pushed out to disk. */
2155
2156 if (EXIMfsync(journal_fd) < 0)
2157 log_write(0, LOG_MAIN|LOG_PANIC, "failed to fsync journal: %s",
2158 strerror(errno));
2159 }
2160
2161 /* Wait for the process to finish. If it terminates with a non-zero code,
2162 freeze the message (except for SIGTERM, SIGKILL and SIGQUIT), but leave the
2163 status values of all the addresses as they are. Take care to handle the case
2164 when the subprocess doesn't seem to exist. This has been seen on one system
2165 when Exim was called from an MUA that set SIGCHLD to SIG_IGN. When that
2166 happens, wait() doesn't recognize the termination of child processes. Exim now
2167 resets SIGCHLD to SIG_DFL, but this code should still be robust. */
2168
2169 while ((rc = wait(&status)) != pid)
2170 {
2171 if (rc < 0 && errno == ECHILD) /* Process has vanished */
2172 {
2173 log_write(0, LOG_MAIN, "%s transport process vanished unexpectedly",
2174 addr->transport->driver_name);
2175 status = 0;
2176 break;
2177 }
2178 }
2179
2180 if ((status & 0xffff) != 0)
2181 {
2182 int msb = (status >> 8) & 255;
2183 int lsb = status & 255;
2184 int code = (msb == 0)? (lsb & 0x7f) : msb;
2185 if (msb != 0 || (code != SIGTERM && code != SIGKILL && code != SIGQUIT))
2186 addr->special_action = SPECIAL_FREEZE;
2187 log_write(0, LOG_MAIN|LOG_PANIC, "%s transport process returned non-zero "
2188 "status 0x%04x: %s %d",
2189 addr->transport->driver_name,
2190 status,
2191 (msb == 0)? "terminated by signal" : "exit code",
2192 code);
2193 }
2194
2195 /* If SPECIAL_WARN is set in the top address, send a warning message. */
2196
2197 if (addr->special_action == SPECIAL_WARN &&
2198 addr->transport->warn_message != NULL)
2199 {
2200 int fd;
2201 uschar *warn_message;
2202
2203 DEBUG(D_deliver) debug_printf("Warning message requested by transport\n");
2204
2205 warn_message = expand_string(addr->transport->warn_message);
2206 if (warn_message == NULL)
2207 log_write(0, LOG_MAIN|LOG_PANIC, "Failed to expand \"%s\" (warning "
2208 "message for %s transport): %s", addr->transport->warn_message,
2209 addr->transport->name, expand_string_message);
2210 else
2211 {
2212 pid_t pid = child_open_exim(&fd);
2213 if (pid > 0)
2214 {
2215 FILE *f = fdopen(fd, "wb");
2216 if (errors_reply_to != NULL &&
2217 !contains_header(US"Reply-To", warn_message))
2218 fprintf(f, "Reply-To: %s\n", errors_reply_to);
2219 fprintf(f, "Auto-Submitted: auto-replied\n");
2220 if (!contains_header(US"From", warn_message)) moan_write_from(f);
2221 fprintf(f, "%s", CS warn_message);
2222
2223 /* Close and wait for child process to complete, without a timeout. */
2224
2225 (void)fclose(f);
2226 (void)child_close(pid, 0);
2227 }
2228 }
2229
2230 addr->special_action = SPECIAL_NONE;
2231 }
2232 }
2233
2234
2235
2236 /*************************************************
2237 * Do local deliveries *
2238 *************************************************/
2239
2240 /* This function processes the list of addresses in addr_local. True local
2241 deliveries are always done one address at a time. However, local deliveries can
2242 be batched up in some cases. Typically this is when writing batched SMTP output
2243 files for use by some external transport mechanism, or when running local
2244 deliveries over LMTP.
2245
2246 Arguments: None
2247 Returns: Nothing
2248 */
2249
2250 static void
2251 do_local_deliveries(void)
2252 {
2253 open_db dbblock;
2254 open_db *dbm_file = NULL;
2255 time_t now = time(NULL);
2256
2257 /* Loop until we have exhausted the supply of local deliveries */
2258
2259 while (addr_local != NULL)
2260 {
2261 time_t delivery_start;
2262 int deliver_time;
2263 address_item *addr2, *addr3, *nextaddr;
2264 int logflags = LOG_MAIN;
2265 int logchar = dont_deliver? '*' : '=';
2266 transport_instance *tp;
2267
2268 /* Pick the first undelivered address off the chain */
2269
2270 address_item *addr = addr_local;
2271 addr_local = addr->next;
2272 addr->next = NULL;
2273
2274 DEBUG(D_deliver|D_transport)
2275 debug_printf("--------> %s <--------\n", addr->address);
2276
2277 /* An internal disaster if there is no transport. Should not occur! */
2278
2279 if ((tp = addr->transport) == NULL)
2280 {
2281 logflags |= LOG_PANIC;
2282 disable_logging = FALSE; /* Jic */
2283 addr->message =
2284 (addr->router != NULL)?
2285 string_sprintf("No transport set by %s router", addr->router->name)
2286 :
2287 string_sprintf("No transport set by system filter");
2288 post_process_one(addr, DEFER, logflags, DTYPE_TRANSPORT, 0);
2289 continue;
2290 }
2291
2292 /* Check that this base address hasn't previously been delivered to this
2293 transport. The check is necessary at this point to handle homonymic addresses
2294 correctly in cases where the pattern of redirection changes between delivery
2295 attempts. Non-homonymic previous delivery is detected earlier, at routing
2296 time. */
2297
2298 if (previously_transported(addr, FALSE)) continue;
2299
2300 /* There are weird cases where logging is disabled */
2301
2302 disable_logging = tp->disable_logging;
2303
2304 /* Check for batched addresses and possible amalgamation. Skip all the work
2305 if either batch_max <= 1 or there aren't any other addresses for local
2306 delivery. */
2307
2308 if (tp->batch_max > 1 && addr_local != NULL)
2309 {
2310 int batch_count = 1;
2311 BOOL uses_dom = readconf_depends((driver_instance *)tp, US"domain");
2312 BOOL uses_lp = (testflag(addr, af_pfr) &&
2313 (testflag(addr, af_file) || addr->local_part[0] == '|')) ||
2314 readconf_depends((driver_instance *)tp, US"local_part");
2315 uschar *batch_id = NULL;
2316 address_item **anchor = &addr_local;
2317 address_item *last = addr;
2318 address_item *next;
2319
2320 /* Expand the batch_id string for comparison with other addresses.
2321 Expansion failure suppresses batching. */
2322
2323 if (tp->batch_id != NULL)
2324 {
2325 deliver_set_expansions(addr);
2326 batch_id = expand_string(tp->batch_id);
2327 deliver_set_expansions(NULL);
2328 if (batch_id == NULL)
2329 {
2330 log_write(0, LOG_MAIN|LOG_PANIC, "Failed to expand batch_id option "
2331 "in %s transport (%s): %s", tp->name, addr->address,
2332 expand_string_message);
2333 batch_count = tp->batch_max;
2334 }
2335 }
2336
2337 /* Until we reach the batch_max limit, pick off addresses which have the
2338 same characteristics. These are:
2339
2340 same transport
2341 not previously delivered (see comment about 50 lines above)
2342 same local part if the transport's configuration contains $local_part
2343 or if this is a file or pipe delivery from a redirection
2344 same domain if the transport's configuration contains $domain
2345 same errors address
2346 same additional headers
2347 same headers to be removed
2348 same uid/gid for running the transport
2349 same first host if a host list is set
2350 */
2351
2352 while ((next = *anchor) != NULL && batch_count < tp->batch_max)
2353 {
2354 BOOL ok =
2355 tp == next->transport &&
2356 !previously_transported(next, TRUE) &&
2357 (addr->flags & (af_pfr|af_file)) == (next->flags & (af_pfr|af_file)) &&
2358 (!uses_lp || Ustrcmp(next->local_part, addr->local_part) == 0) &&
2359 (!uses_dom || Ustrcmp(next->domain, addr->domain) == 0) &&
2360 same_strings(next->p.errors_address, addr->p.errors_address) &&
2361 same_headers(next->p.extra_headers, addr->p.extra_headers) &&
2362 same_strings(next->p.remove_headers, addr->p.remove_headers) &&
2363 same_ugid(tp, addr, next) &&
2364 ((addr->host_list == NULL && next->host_list == NULL) ||
2365 (addr->host_list != NULL && next->host_list != NULL &&
2366 Ustrcmp(addr->host_list->name, next->host_list->name) == 0));
2367
2368 /* If the transport has a batch_id setting, batch_id will be non-NULL
2369 from the expansion outside the loop. Expand for this address and compare.
2370 Expansion failure makes this address ineligible for batching. */
2371
2372 if (ok && batch_id != NULL)
2373 {
2374 uschar *bid;
2375 address_item *save_nextnext = next->next;
2376 next->next = NULL; /* Expansion for a single address */
2377 deliver_set_expansions(next);
2378 next->next = save_nextnext;
2379 bid = expand_string(tp->batch_id);
2380 deliver_set_expansions(NULL);
2381 if (bid == NULL)
2382 {
2383 log_write(0, LOG_MAIN|LOG_PANIC, "Failed to expand batch_id option "
2384 "in %s transport (%s): %s", tp->name, next->address,
2385 expand_string_message);
2386 ok = FALSE;
2387 }
2388 else ok = (Ustrcmp(batch_id, bid) == 0);
2389 }
2390
2391 /* Take address into batch if OK. */
2392
2393 if (ok)
2394 {
2395 *anchor = next->next; /* Include the address */
2396 next->next = NULL;
2397 last->next = next;
2398 last = next;
2399 batch_count++;
2400 }
2401 else anchor = &(next->next); /* Skip the address */
2402 }
2403 }
2404
2405 /* We now have one or more addresses that can be delivered in a batch. Check
2406 whether the transport is prepared to accept a message of this size. If not,
2407 fail them all forthwith. If the expansion fails, or does not yield an
2408 integer, defer delivery. */
2409
2410 if (tp->message_size_limit != NULL)
2411 {
2412 int rc = check_message_size(tp, addr);
2413 if (rc != OK)
2414 {
2415 replicate_status(addr);
2416 while (addr != NULL)
2417 {
2418 addr2 = addr->next;
2419 post_process_one(addr, rc, logflags, DTYPE_TRANSPORT, 0);
2420 addr = addr2;
2421 }
2422 continue; /* With next batch of addresses */
2423 }
2424 }
2425
2426 /* If we are not running the queue, or if forcing, all deliveries will be
2427 attempted. Otherwise, we must respect the retry times for each address. Even
2428 when not doing this, we need to set up the retry key string, and determine
2429 whether a retry record exists, because after a successful delivery, a delete
2430 retry item must be set up. Keep the retry database open only for the duration
2431 of these checks, rather than for all local deliveries, because some local
2432 deliveries (e.g. to pipes) can take a substantial time. */
2433
2434 dbm_file = dbfn_open(US"retry", O_RDONLY, &dbblock, FALSE);
2435 if (dbm_file == NULL)
2436 {
2437 DEBUG(D_deliver|D_retry|D_hints_lookup)
2438 debug_printf("no retry data available\n");
2439 }
2440
2441 addr2 = addr;
2442 addr3 = NULL;
2443 while (addr2 != NULL)
2444 {
2445 BOOL ok = TRUE; /* to deliver this address */
2446 uschar *retry_key;
2447
2448 /* Set up the retry key to include the domain or not, and change its
2449 leading character from "R" to "T". Must make a copy before doing this,
2450 because the old key may be pointed to from a "delete" retry item after
2451 a routing delay. */
2452
2453 retry_key = string_copy(
2454 (tp->retry_use_local_part)? addr2->address_retry_key :
2455 addr2->domain_retry_key);
2456 *retry_key = 'T';
2457
2458 /* Inspect the retry data. If there is no hints file, delivery happens. */
2459
2460 if (dbm_file != NULL)
2461 {
2462 dbdata_retry *retry_record = dbfn_read(dbm_file, retry_key);
2463
2464 /* If there is no retry record, delivery happens. If there is,
2465 remember it exists so it can be deleted after a successful delivery. */
2466
2467 if (retry_record != NULL)
2468 {
2469 setflag(addr2, af_lt_retry_exists);
2470
2471 /* A retry record exists for this address. If queue running and not
2472 forcing, inspect its contents. If the record is too old, or if its
2473 retry time has come, or if it has passed its cutoff time, delivery
2474 will go ahead. */
2475
2476 DEBUG(D_retry)
2477 {
2478 debug_printf("retry record exists: age=%s ",
2479 readconf_printtime(now - retry_record->time_stamp));
2480 debug_printf("(max %s)\n", readconf_printtime(retry_data_expire));
2481 debug_printf(" time to retry = %s expired = %d\n",
2482 readconf_printtime(retry_record->next_try - now),
2483 retry_record->expired);
2484 }
2485
2486 if (queue_running && !deliver_force)
2487 {
2488 ok = (now - retry_record->time_stamp > retry_data_expire) ||
2489 (now >= retry_record->next_try) ||
2490 retry_record->expired;
2491
2492 /* If we haven't reached the retry time, there is one more check
2493 to do, which is for the ultimate address timeout. */
2494
2495 if (!ok)
2496 ok = retry_ultimate_address_timeout(retry_key, addr2->domain,
2497 retry_record, now);
2498 }
2499 }
2500 else DEBUG(D_retry) debug_printf("no retry record exists\n");
2501 }
2502
2503 /* This address is to be delivered. Leave it on the chain. */
2504
2505 if (ok)
2506 {
2507 addr3 = addr2;
2508 addr2 = addr2->next;
2509 }
2510
2511 /* This address is to be deferred. Take it out of the chain, and
2512 post-process it as complete. Must take it out of the chain first,
2513 because post processing puts it on another chain. */
2514
2515 else
2516 {
2517 address_item *this = addr2;
2518 this->message = US"Retry time not yet reached";
2519 this->basic_errno = ERRNO_LRETRY;
2520 if (addr3 == NULL) addr2 = addr = addr2->next;
2521 else addr2 = addr3->next = addr2->next;
2522 post_process_one(this, DEFER, logflags, DTYPE_TRANSPORT, 0);
2523 }
2524 }
2525
2526 if (dbm_file != NULL) dbfn_close(dbm_file);
2527
2528 /* If there are no addresses left on the chain, they all deferred. Loop
2529 for the next set of addresses. */
2530
2531 if (addr == NULL) continue;
2532
2533 /* So, finally, we do have some addresses that can be passed to the
2534 transport. Before doing so, set up variables that are relevant to a
2535 single delivery. */
2536
2537 deliver_set_expansions(addr);
2538 delivery_start = time(NULL);
2539 deliver_local(addr, FALSE);
2540 deliver_time = (int)(time(NULL) - delivery_start);
2541
2542 /* If a shadow transport (which must perforce be another local transport), is
2543 defined, and its condition is met, we must pass the message to the shadow
2544 too, but only those addresses that succeeded. We do this by making a new
2545 chain of addresses - also to keep the original chain uncontaminated. We must
2546 use a chain rather than doing it one by one, because the shadow transport may
2547 batch.
2548
2549 NOTE: if the condition fails because of a lookup defer, there is nothing we
2550 can do! */
2551
2552 if (tp->shadow != NULL &&
2553 (tp->shadow_condition == NULL ||
2554 expand_check_condition(tp->shadow_condition, tp->name, US"transport")))
2555 {
2556 transport_instance *stp;
2557 address_item *shadow_addr = NULL;
2558 address_item **last = &shadow_addr;
2559
2560 for (stp = transports; stp != NULL; stp = stp->next)
2561 if (Ustrcmp(stp->name, tp->shadow) == 0) break;
2562
2563 if (stp == NULL)
2564 log_write(0, LOG_MAIN|LOG_PANIC, "shadow transport \"%s\" not found ",
2565 tp->shadow);
2566
2567 /* Pick off the addresses that have succeeded, and make clones. Put into
2568 the shadow_message field a pointer to the shadow_message field of the real
2569 address. */
2570
2571 else for (addr2 = addr; addr2 != NULL; addr2 = addr2->next)
2572 {
2573 if (addr2->transport_return != OK) continue;
2574 addr3 = store_get(sizeof(address_item));
2575 *addr3 = *addr2;
2576 addr3->next = NULL;
2577 addr3->shadow_message = (uschar *)(&(addr2->shadow_message));
2578 addr3->transport = stp;
2579 addr3->transport_return = DEFER;
2580 addr3->return_filename = NULL;
2581 addr3->return_file = -1;
2582 *last = addr3;
2583 last = &(addr3->next);
2584 }
2585
2586 /* If we found any addresses to shadow, run the delivery, and stick any
2587 message back into the shadow_message field in the original. */
2588
2589 if (shadow_addr != NULL)
2590 {
2591 int save_count = transport_count;
2592
2593 DEBUG(D_deliver|D_transport)
2594 debug_printf(">>>>>>>>>>>>>>>> Shadow delivery >>>>>>>>>>>>>>>>\n");
2595 deliver_local(shadow_addr, TRUE);
2596
2597 for(; shadow_addr != NULL; shadow_addr = shadow_addr->next)
2598 {
2599 int sresult = shadow_addr->transport_return;
2600 *((uschar **)(shadow_addr->shadow_message)) = (sresult == OK)?
2601 string_sprintf(" ST=%s", stp->name) :
2602 string_sprintf(" ST=%s (%s%s%s)", stp->name,
2603 (shadow_addr->basic_errno <= 0)?
2604 US"" : US strerror(shadow_addr->basic_errno),
2605 (shadow_addr->basic_errno <= 0 || shadow_addr->message == NULL)?
2606 US"" : US": ",
2607 (shadow_addr->message != NULL)? shadow_addr->message :
2608 (shadow_addr->basic_errno <= 0)? US"unknown error" : US"");
2609
2610 DEBUG(D_deliver|D_transport)
2611 debug_printf("%s shadow transport returned %s for %s\n",
2612 stp->name,
2613 (sresult == OK)? "OK" :
2614 (sresult == DEFER)? "DEFER" :
2615 (sresult == FAIL)? "FAIL" :
2616 (sresult == PANIC)? "PANIC" : "?",
2617 shadow_addr->address);
2618 }
2619
2620 DEBUG(D_deliver|D_transport)
2621 debug_printf(">>>>>>>>>>>>>>>> End shadow delivery >>>>>>>>>>>>>>>>\n");
2622
2623 transport_count = save_count; /* Restore original transport count */
2624 }
2625 }
2626
2627 /* Cancel the expansions that were set up for the delivery. */
2628
2629 deliver_set_expansions(NULL);
2630
2631 /* Now we can process the results of the real transport. We must take each
2632 address off the chain first, because post_process_one() puts it on another
2633 chain. */
2634
2635 for (addr2 = addr; addr2 != NULL; addr2 = nextaddr)
2636 {
2637 int result = addr2->transport_return;
2638 nextaddr = addr2->next;
2639
2640 DEBUG(D_deliver|D_transport)
2641 debug_printf("%s transport returned %s for %s\n",
2642 tp->name,
2643 (result == OK)? "OK" :
2644 (result == DEFER)? "DEFER" :
2645 (result == FAIL)? "FAIL" :
2646 (result == PANIC)? "PANIC" : "?",
2647 addr2->address);
2648
2649 /* If there is a retry_record, or if delivery is deferred, build a retry
2650 item for setting a new retry time or deleting the old retry record from
2651 the database. These items are handled all together after all addresses
2652 have been handled (so the database is open just for a short time for
2653 updating). */
2654
2655 if (result == DEFER || testflag(addr2, af_lt_retry_exists))
2656 {
2657 int flags = (result == DEFER)? 0 : rf_delete;
2658 uschar *retry_key = string_copy((tp->retry_use_local_part)?
2659 addr2->address_retry_key : addr2->domain_retry_key);
2660 *retry_key = 'T';
2661 retry_add_item(addr2, retry_key, flags);
2662 }
2663
2664 /* Done with this address */
2665
2666 if (result == OK) addr2->more_errno = deliver_time;
2667 post_process_one(addr2, result, logflags, DTYPE_TRANSPORT, logchar);
2668
2669 /* If a pipe delivery generated text to be sent back, the result may be
2670 changed to FAIL, and we must copy this for subsequent addresses in the
2671 batch. */
2672
2673 if (addr2->transport_return != result)
2674 {
2675 for (addr3 = nextaddr; addr3 != NULL; addr3 = addr3->next)
2676 {
2677 addr3->transport_return = addr2->transport_return;
2678 addr3->basic_errno = addr2->basic_errno;
2679 addr3->message = addr2->message;
2680 }
2681 result = addr2->transport_return;
2682 }
2683
2684 /* Whether or not the result was changed to FAIL, we need to copy the
2685 return_file value from the first address into all the addresses of the
2686 batch, so they are all listed in the error message. */
2687
2688 addr2->return_file = addr->return_file;
2689
2690 /* Change log character for recording successful deliveries. */
2691
2692 if (result == OK) logchar = '-';
2693 }
2694 } /* Loop back for next batch of addresses */
2695 }
2696
2697
2698
2699
2700 /*************************************************
2701 * Sort remote deliveries *
2702 *************************************************/
2703
2704 /* This function is called if remote_sort_domains is set. It arranges that the
2705 chain of addresses for remote deliveries is ordered according to the strings
2706 specified. Try to make this shuffling reasonably efficient by handling
2707 sequences of addresses rather than just single ones.
2708
2709 Arguments: None
2710 Returns: Nothing
2711 */
2712
2713 static void
2714 sort_remote_deliveries(void)
2715 {
2716 int sep = 0;
2717 address_item **aptr = &addr_remote;
2718 uschar *listptr = remote_sort_domains;
2719 uschar *pattern;
2720 uschar patbuf[256];
2721
2722 while (*aptr != NULL &&
2723 (pattern = string_nextinlist(&listptr, &sep, patbuf, sizeof(patbuf)))
2724 != NULL)
2725 {
2726 address_item *moved = NULL;
2727 address_item **bptr = &moved;
2728
2729 while (*aptr != NULL)
2730 {
2731 address_item **next;
2732 deliver_domain = (*aptr)->domain; /* set $domain */
2733 if (match_isinlist(deliver_domain, &pattern, UCHAR_MAX+1,
2734 &domainlist_anchor, NULL, MCL_DOMAIN, TRUE, NULL) == OK)
2735 {
2736 aptr = &((*aptr)->next);
2737 continue;
2738 }
2739
2740 next = &((*aptr)->next);
2741 while (*next != NULL &&
2742 (deliver_domain = (*next)->domain, /* Set $domain */
2743 match_isinlist(deliver_domain, &pattern, UCHAR_MAX+1,
2744 &domainlist_anchor, NULL, MCL_DOMAIN, TRUE, NULL)) != OK)
2745 next = &((*next)->next);
2746
2747 /* If the batch of non-matchers is at the end, add on any that were
2748 extracted further up the chain, and end this iteration. Otherwise,
2749 extract them from the chain and hang on the moved chain. */
2750
2751 if (*next == NULL)
2752 {
2753 *next = moved;
2754 break;
2755 }
2756
2757 *bptr = *aptr;
2758 *aptr = *next;
2759 *next = NULL;
2760 bptr = next;
2761 aptr = &((*aptr)->next);
2762 }
2763
2764 /* If the loop ended because the final address matched, *aptr will
2765 be NULL. Add on to the end any extracted non-matching addresses. If
2766 *aptr is not NULL, the loop ended via "break" when *next is null, that
2767 is, there was a string of non-matching addresses at the end. In this
2768 case the extracted addresses have already been added on the end. */
2769
2770 if (*aptr == NULL) *aptr = moved;
2771 }
2772
2773 DEBUG(D_deliver)
2774 {
2775 address_item *addr;
2776 debug_printf("remote addresses after sorting:\n");
2777 for (addr = addr_remote; addr != NULL; addr = addr->next)
2778 debug_printf(" %s\n", addr->address);
2779 }
2780 }
2781
2782
2783
2784 /*************************************************
2785 * Read from pipe for remote delivery subprocess *
2786 *************************************************/
2787
2788 /* This function is called when the subprocess is complete, but can also be
2789 called before it is complete, in order to empty a pipe that is full (to prevent
2790 deadlock). It must therefore keep track of its progress in the parlist data
2791 block.
2792
2793 We read the pipe to get the delivery status codes and a possible error message
2794 for each address, optionally preceded by unusability data for the hosts and
2795 also by optional retry data.
2796
2797 Read in large chunks into the big buffer and then scan through, interpreting
2798 the data therein. In most cases, only a single read will be necessary. No
2799 individual item will ever be anywhere near 2500 bytes in length, so by ensuring
2800 that we read the next chunk when there is less than 2500 bytes left in the
2801 non-final chunk, we can assume each item is complete in the buffer before
2802 handling it. Each item is written using a single write(), which is atomic for
2803 small items (less than PIPE_BUF, which seems to be at least 512 in any Unix and
2804 often bigger) so even if we are reading while the subprocess is still going, we
2805 should never have only a partial item in the buffer.
2806
2807 Argument:
2808 poffset the offset of the parlist item
2809 eop TRUE if the process has completed
2810
2811 Returns: TRUE if the terminating 'Z' item has been read,
2812 or there has been a disaster (i.e. no more data needed);
2813 FALSE otherwise
2814 */
2815
2816 static BOOL
2817 par_read_pipe(int poffset, BOOL eop)
2818 {
2819 host_item *h;
2820 pardata *p = parlist + poffset;
2821 address_item *addrlist = p->addrlist;
2822 address_item *addr = p->addr;
2823 pid_t pid = p->pid;
2824 int fd = p->fd;
2825 uschar *endptr = big_buffer;
2826 uschar *ptr = endptr;
2827 uschar *msg = p->msg;
2828 BOOL done = p->done;
2829 BOOL unfinished = TRUE;
2830
2831 /* Loop through all items, reading from the pipe when necessary. The pipe
2832 is set up to be non-blocking, but there are two different Unix mechanisms in
2833 use. Exim uses O_NONBLOCK if it is defined. This returns 0 for end of file,
2834 and EAGAIN for no more data. If O_NONBLOCK is not defined, Exim uses O_NDELAY,
2835 which returns 0 for both end of file and no more data. We distinguish the
2836 two cases by taking 0 as end of file only when we know the process has
2837 completed.
2838
2839 Each separate item is written to the pipe in a single write(), and as they are
2840 all short items, the writes will all be atomic and we should never find
2841 ourselves in the position of having read an incomplete item. "Short" in this
2842 case can mean up to about 1K in the case when there is a long error message
2843 associated with an address. */
2844
2845 DEBUG(D_deliver) debug_printf("reading pipe for subprocess %d (%s)\n",
2846 (int)p->pid, eop? "ended" : "not ended");
2847
2848 while (!done)
2849 {
2850 retry_item *r, **rp;
2851 int remaining = endptr - ptr;
2852
2853 /* Read (first time) or top up the chars in the buffer if necessary.
2854 There will be only one read if we get all the available data (i.e. don't
2855 fill the buffer completely). */
2856
2857 if (remaining < 2500 && unfinished)
2858 {
2859 int len;
2860 int available = big_buffer_size - remaining;
2861
2862 if (remaining > 0) memmove(big_buffer, ptr, remaining);
2863
2864 ptr = big_buffer;
2865 endptr = big_buffer + remaining;
2866 len = read(fd, endptr, available);
2867
2868 DEBUG(D_deliver) debug_printf("read() yielded %d\n", len);
2869
2870 /* If the result is EAGAIN and the process is not complete, just
2871 stop reading any more and process what we have already. */
2872
2873 if (len < 0)
2874 {
2875 if (!eop && errno == EAGAIN) len = 0; else
2876 {
2877 msg = string_sprintf("failed to read pipe from transport process "
2878 "%d for transport %s: %s", pid, addr->transport->driver_name,
2879 strerror(errno));
2880 break;
2881 }
2882 }
2883
2884 /* If the length is zero (eof or no-more-data), just process what we
2885 already have. Note that if the process is still running and we have
2886 read all the data in the pipe (but less that "available") then we
2887 won't read any more, as "unfinished" will get set FALSE. */
2888
2889 endptr += len;
2890 unfinished = len == available;
2891 }
2892
2893 /* If we are at the end of the available data, exit the loop. */
2894
2895 if (ptr >= endptr) break;
2896
2897 /* Handle each possible type of item, assuming the complete item is
2898 available in store. */
2899
2900 switch (*ptr++)
2901 {
2902 /* Host items exist only if any hosts were marked unusable. Match
2903 up by checking the IP address. */
2904
2905 case 'H':
2906 for (h = addrlist->host_list; h != NULL; h = h->next)
2907 {
2908 if (h->address == NULL || Ustrcmp(h->address, ptr+2) != 0) continue;
2909 h->status = ptr[0];
2910 h->why = ptr[1];
2911 }
2912 ptr += 2;
2913 while (*ptr++);
2914 break;
2915
2916 /* Retry items are sent in a preceding R item for each address. This is
2917 kept separate to keep each message short enough to guarantee it won't
2918 be split in the pipe. Hopefully, in the majority of cases, there won't in
2919 fact be any retry items at all.
2920
2921 The complete set of retry items might include an item to delete a
2922 routing retry if there was a previous routing delay. However, routing
2923 retries are also used when a remote transport identifies an address error.
2924 In that case, there may also be an "add" item for the same key. Arrange
2925 that a "delete" item is dropped in favour of an "add" item. */
2926
2927 case 'R':
2928 if (addr == NULL) goto ADDR_MISMATCH;
2929
2930 DEBUG(D_deliver|D_retry)
2931 debug_printf("reading retry information for %s from subprocess\n",
2932 ptr+1);
2933
2934 /* Cut out any "delete" items on the list. */
2935
2936 for (rp = &(addr->retries); (r = *rp) != NULL; rp = &(r->next))
2937 {
2938 if (Ustrcmp(r->key, ptr+1) == 0) /* Found item with same key */
2939 {
2940 if ((r->flags & rf_delete) == 0) break; /* It was not "delete" */
2941 *rp = r->next; /* Excise a delete item */
2942 DEBUG(D_deliver|D_retry)
2943 debug_printf(" existing delete item dropped\n");
2944 }
2945 }
2946
2947 /* We want to add a delete item only if there is no non-delete item;
2948 however we still have to step ptr through the data. */
2949
2950 if (r == NULL || (*ptr & rf_delete) == 0)
2951 {
2952 r = store_get(sizeof(retry_item));
2953 r->next = addr->retries;
2954 addr->retries = r;
2955 r->flags = *ptr++;
2956 r->key = string_copy(ptr);
2957 while (*ptr++);
2958 memcpy(&(r->basic_errno), ptr, sizeof(r->basic_errno));
2959 ptr += sizeof(r->basic_errno);
2960 memcpy(&(r->more_errno), ptr, sizeof(r->more_errno));
2961 ptr += sizeof(r->more_errno);
2962 r->message = (*ptr)? string_copy(ptr) : NULL;
2963 DEBUG(D_deliver|D_retry)
2964 debug_printf(" added %s item\n",
2965 ((r->flags & rf_delete) == 0)? "retry" : "delete");
2966 }
2967
2968 else
2969 {
2970 DEBUG(D_deliver|D_retry)
2971 debug_printf(" delete item not added: non-delete item exists\n");
2972 ptr++;
2973 while(*ptr++);
2974 ptr += sizeof(r->basic_errno) + sizeof(r->more_errno);
2975 }
2976
2977 while(*ptr++);
2978 break;
2979
2980 /* Put the amount of data written into the parlist block */
2981
2982 case 'S':
2983 memcpy(&(p->transport_count), ptr, sizeof(transport_count));
2984 ptr += sizeof(transport_count);
2985 break;
2986
2987 /* Address items are in the order of items on the address chain. We
2988 remember the current address value in case this function is called
2989 several times to empty the pipe in stages. Information about delivery
2990 over TLS is sent in a preceding X item for each address. We don't put
2991 it in with the other info, in order to keep each message short enough to
2992 guarantee it won't be split in the pipe. */
2993
2994 #ifdef SUPPORT_TLS
2995 case 'X':
2996 if (addr == NULL) goto ADDR_MISMATCH; /* Below, in 'A' handler */
2997 switch (*ptr++)
2998 {
2999 case '1':
3000 addr->cipher = NULL;
3001 addr->peerdn = NULL;
3002
3003 if (*ptr)
3004 addr->cipher = string_copy(ptr);
3005 while (*ptr++);
3006 if (*ptr)
3007 addr->peerdn = string_copy(ptr);
3008 break;
3009
3010 case '2':
3011 addr->peercert = NULL;
3012 if (*ptr)
3013 (void) tls_import_cert(ptr, &addr->peercert);
3014 break;
3015
3016 case '3':
3017 addr->ourcert = NULL;
3018 if (*ptr)
3019 (void) tls_import_cert(ptr, &addr->ourcert);
3020 break;
3021
3022 #ifdef EXPERIMENTAL_OCSP
3023 case '4':
3024 addr->ocsp = OCSP_NOT_REQ;
3025 if (*ptr)
3026 addr->ocsp = *ptr - '0';
3027 break;
3028 #endif
3029 }
3030 while (*ptr++);
3031 break;
3032 #endif /*SUPPORT_TLS*/
3033
3034 case 'C': /* client authenticator information */
3035 switch (*ptr++)
3036 {
3037 case '1':
3038 addr->authenticator = (*ptr)? string_copy(ptr) : NULL;
3039 break;
3040 case '2':
3041 addr->auth_id = (*ptr)? string_copy(ptr) : NULL;
3042 break;
3043 case '3':
3044 addr->auth_sndr = (*ptr)? string_copy(ptr) : NULL;
3045 break;
3046 }
3047 while (*ptr++);
3048 break;
3049
3050 #ifndef DISABLE_PRDR
3051 case 'P':
3052 addr->flags |= af_prdr_used;
3053 break;
3054 #endif
3055
3056 #ifdef EXPERIMENTAL_DSN
3057 case 'D':
3058 if (addr == NULL) break;
3059 memcpy(&(addr->dsn_aware), ptr, sizeof(addr->dsn_aware));
3060 ptr += sizeof(addr->dsn_aware);
3061 DEBUG(D_deliver) debug_printf("DSN read: addr->dsn_aware = %d\n", addr->dsn_aware);
3062 break;
3063 #endif
3064
3065 case 'A':
3066 if (addr == NULL)
3067 {
3068 ADDR_MISMATCH:
3069 msg = string_sprintf("address count mismatch for data read from pipe "
3070 "for transport process %d for transport %s", pid,
3071 addrlist->transport->driver_name);
3072 done = TRUE;
3073 break;
3074 }
3075
3076 addr->transport_return = *ptr++;
3077 addr->special_action = *ptr++;
3078 memcpy(&(addr->basic_errno), ptr, sizeof(addr->basic_errno));
3079 ptr += sizeof(addr->basic_errno);
3080 memcpy(&(addr->more_errno), ptr, sizeof(addr->more_errno));
3081 ptr += sizeof(addr->more_errno);
3082 memcpy(&(addr->flags), ptr, sizeof(addr->flags));
3083 ptr += sizeof(addr->flags);
3084 addr->message = (*ptr)? string_copy(ptr) : NULL;
3085 while(*ptr++);
3086 addr->user_message = (*ptr)? string_copy(ptr) : NULL;
3087 while(*ptr++);
3088
3089 /* Always two strings for host information, followed by the port number and DNSSEC mark */
3090
3091 if (*ptr != 0)
3092 {
3093 h = store_get(sizeof(host_item));
3094 h->name = string_copy(ptr);
3095 while (*ptr++);
3096 h->address = string_copy(ptr);
3097 while(*ptr++);
3098 memcpy(&(h->port), ptr, sizeof(h->port));
3099 ptr += sizeof(h->port);
3100 h->dnssec = *ptr == '2' ? DS_YES
3101 : *ptr == '1' ? DS_NO
3102 : DS_UNK;
3103 ptr++;
3104 addr->host_used = h;
3105 }
3106 else ptr++;
3107
3108 /* Finished with this address */
3109
3110 addr = addr->next;
3111 break;
3112
3113 /* Z marks the logical end of the data. It is followed by '0' if
3114 continue_transport was NULL at the end of transporting, otherwise '1'.
3115 We need to know when it becomes NULL during a delivery down a passed SMTP
3116 channel so that we don't try to pass anything more down it. Of course, for
3117 most normal messages it will remain NULL all the time. */
3118
3119 case 'Z':
3120 if (*ptr == '0')
3121 {
3122 continue_transport = NULL;
3123 continue_hostname = NULL;
3124 }
3125 done = TRUE;
3126 DEBUG(D_deliver) debug_printf("Z%c item read\n", *ptr);
3127 break;
3128
3129 /* Anything else is a disaster. */
3130
3131 default:
3132 msg = string_sprintf("malformed data (%d) read from pipe for transport "
3133 "process %d for transport %s", ptr[-1], pid,
3134 addr->transport->driver_name);
3135 done = TRUE;
3136 break;
3137 }
3138 }
3139
3140 /* The done flag is inspected externally, to determine whether or not to
3141 call the function again when the process finishes. */
3142
3143 p->done = done;
3144
3145 /* If the process hadn't finished, and we haven't seen the end of the data
3146 or suffered a disaster, update the rest of the state, and return FALSE to
3147 indicate "not finished". */
3148
3149 if (!eop && !done)
3150 {
3151 p->addr = addr;
3152 p->msg = msg;
3153 return FALSE;
3154 }
3155
3156 /* Close our end of the pipe, to prevent deadlock if the far end is still
3157 pushing stuff into it. */
3158
3159 (void)close(fd);
3160 p->fd = -1;
3161
3162 /* If we have finished without error, but haven't had data for every address,
3163 something is wrong. */
3164
3165 if (msg == NULL && addr != NULL)
3166 msg = string_sprintf("insufficient address data read from pipe "
3167 "for transport process %d for transport %s", pid,
3168 addr->transport->driver_name);
3169
3170 /* If an error message is set, something has gone wrong in getting back
3171 the delivery data. Put the message into each address and freeze it. */
3172
3173 if (msg != NULL)
3174 {
3175 for (addr = addrlist; addr != NULL; addr = addr->next)
3176 {
3177 addr->transport_return = DEFER;
3178 addr->special_action = SPECIAL_FREEZE;
3179 addr->message = msg;
3180 }
3181 }
3182
3183 /* Return TRUE to indicate we have got all we need from this process, even
3184 if it hasn't actually finished yet. */
3185
3186 return TRUE;
3187 }
3188
3189
3190
3191 /*************************************************
3192 * Post-process a set of remote addresses *
3193 *************************************************/
3194
3195 /* Do what has to be done immediately after a remote delivery for each set of
3196 addresses, then re-write the spool if necessary. Note that post_process_one
3197 puts the address on an appropriate queue; hence we must fish off the next
3198 one first. This function is also called if there is a problem with setting
3199 up a subprocess to do a remote delivery in parallel. In this case, the final
3200 argument contains a message, and the action must be forced to DEFER.
3201
3202 Argument:
3203 addr pointer to chain of address items
3204 logflags flags for logging
3205 msg NULL for normal cases; -> error message for unexpected problems
3206 fallback TRUE if processing fallback hosts
3207
3208 Returns: nothing
3209 */
3210
3211 static void
3212 remote_post_process(address_item *addr, int logflags, uschar *msg,
3213 BOOL fallback)
3214 {
3215 host_item *h;
3216
3217 /* If any host addresses were found to be unusable, add them to the unusable
3218 tree so that subsequent deliveries don't try them. */
3219
3220 for (h = addr->host_list; h != NULL; h = h->next)
3221 {
3222 if (h->address == NULL) continue;
3223 if (h->status >= hstatus_unusable) tree_add_unusable(h);
3224 }
3225
3226 /* Now handle each address on the chain. The transport has placed '=' or '-'
3227 into the special_action field for each successful delivery. */
3228
3229 while (addr != NULL)
3230 {
3231 address_item *next = addr->next;
3232
3233 /* If msg == NULL (normal processing) and the result is DEFER and we are
3234 processing the main hosts and there are fallback hosts available, put the
3235 address on the list for fallback delivery. */
3236
3237 if (addr->transport_return == DEFER &&
3238 addr->fallback_hosts != NULL &&
3239 !fallback &&
3240 msg == NULL)
3241 {
3242 addr->host_list = addr->fallback_hosts;
3243 addr->next = addr_fallback;
3244 addr_fallback = addr;
3245 DEBUG(D_deliver) debug_printf("%s queued for fallback host(s)\n", addr->address);
3246 }
3247
3248 /* If msg is set (=> unexpected problem), set it in the address before
3249 doing the ordinary post processing. */
3250
3251 else
3252 {
3253 if (msg != NULL)
3254 {
3255 addr->message = msg;
3256 addr->transport_return = DEFER;
3257 }
3258 (void)post_process_one(addr, addr->transport_return, logflags,
3259 DTYPE_TRANSPORT, addr->special_action);
3260 }
3261
3262 /* Next address */
3263
3264 addr = next;
3265 }
3266
3267 /* If we have just delivered down a passed SMTP channel, and that was
3268 the last address, the channel will have been closed down. Now that
3269 we have logged that delivery, set continue_sequence to 1 so that
3270 any subsequent deliveries don't get "*" incorrectly logged. */
3271
3272 if (continue_transport == NULL) continue_sequence = 1;
3273 }
3274
3275
3276
3277 /*************************************************
3278 * Wait for one remote delivery subprocess *
3279 *************************************************/
3280
3281 /* This function is called while doing remote deliveries when either the
3282 maximum number of processes exist and we need one to complete so that another
3283 can be created, or when waiting for the last ones to complete. It must wait for
3284 the completion of one subprocess, empty the control block slot, and return a
3285 pointer to the address chain.
3286
3287 Arguments: none
3288 Returns: pointer to the chain of addresses handled by the process;
3289 NULL if no subprocess found - this is an unexpected error
3290 */
3291
3292 static address_item *
3293 par_wait(void)
3294 {
3295 int poffset, status;
3296 address_item *addr, *addrlist;
3297 pid_t pid;
3298
3299 set_process_info("delivering %s: waiting for a remote delivery subprocess "
3300 "to finish", message_id);
3301
3302 /* Loop until either a subprocess completes, or there are no subprocesses in
3303 existence - in which case give an error return. We cannot proceed just by
3304 waiting for a completion, because a subprocess may have filled up its pipe, and
3305 be waiting for it to be emptied. Therefore, if no processes have finished, we
3306 wait for one of the pipes to acquire some data by calling select(), with a
3307 timeout just in case.
3308
3309 The simple approach is just to iterate after reading data from a ready pipe.
3310 This leads to non-ideal behaviour when the subprocess has written its final Z
3311 item, closed the pipe, and is in the process of exiting (the common case). A
3312 call to waitpid() yields nothing completed, but select() shows the pipe ready -
3313 reading it yields EOF, so you end up with busy-waiting until the subprocess has
3314 actually finished.
3315
3316 To avoid this, if all the data that is needed has been read from a subprocess
3317 after select(), an explicit wait() for it is done. We know that all it is doing
3318 is writing to the pipe and then exiting, so the wait should not be long.
3319
3320 The non-blocking waitpid() is to some extent just insurance; if we could
3321 reliably detect end-of-file on the pipe, we could always know when to do a
3322 blocking wait() for a completed process. However, because some systems use
3323 NDELAY, which doesn't distinguish between EOF and pipe empty, it is easier to
3324 use code that functions without the need to recognize EOF.
3325
3326 There's a double loop here just in case we end up with a process that is not in
3327 the list of remote delivery processes. Something has obviously gone wrong if
3328 this is the case. (For example, a process that is incorrectly left over from
3329 routing or local deliveries might be found.) The damage can be minimized by
3330 looping back and looking for another process. If there aren't any, the error
3331 return will happen. */
3332
3333 for (;;) /* Normally we do not repeat this loop */
3334 {
3335 while ((pid = waitpid(-1, &status, WNOHANG)) <= 0)
3336 {
3337 struct timeval tv;
3338 fd_set select_pipes;
3339 int maxpipe, readycount;
3340
3341 /* A return value of -1 can mean several things. If errno != ECHILD, it
3342 either means invalid options (which we discount), or that this process was
3343 interrupted by a signal. Just loop to try the waitpid() again.
3344
3345 If errno == ECHILD, waitpid() is telling us that there are no subprocesses
3346 in existence. This should never happen, and is an unexpected error.
3347 However, there is a nasty complication when running under Linux. If "strace
3348 -f" is being used under Linux to trace this process and its children,
3349 subprocesses are "stolen" from their parents and become the children of the
3350 tracing process. A general wait such as the one we've just obeyed returns
3351 as if there are no children while subprocesses are running. Once a
3352 subprocess completes, it is restored to the parent, and waitpid(-1) finds
3353 it. Thanks to Joachim Wieland for finding all this out and suggesting a
3354 palliative.
3355
3356 This does not happen using "truss" on Solaris, nor (I think) with other
3357 tracing facilities on other OS. It seems to be specific to Linux.
3358
3359 What we do to get round this is to use kill() to see if any of our
3360 subprocesses are still in existence. If kill() gives an OK return, we know
3361 it must be for one of our processes - it can't be for a re-use of the pid,
3362 because if our process had finished, waitpid() would have found it. If any
3363 of our subprocesses are in existence, we proceed to use select() as if
3364 waitpid() had returned zero. I think this is safe. */
3365
3366 if (pid < 0)
3367 {
3368 if (errno != ECHILD) continue; /* Repeats the waitpid() */
3369
3370 DEBUG(D_deliver)
3371 debug_printf("waitpid() returned -1/ECHILD: checking explicitly "
3372 "for process existence\n");
3373
3374 for (poffset = 0; poffset < remote_max_parallel; poffset++)
3375 {
3376 if ((pid = parlist[poffset].pid) != 0 && kill(pid, 0) == 0)
3377 {
3378 DEBUG(D_deliver) debug_printf("process %d still exists: assume "
3379 "stolen by strace\n", (int)pid);
3380 break; /* With poffset set */
3381 }
3382 }
3383
3384 if (poffset >= remote_max_parallel)
3385 {
3386 DEBUG(D_deliver) debug_printf("*** no delivery children found\n");
3387 return NULL; /* This is the error return */
3388 }
3389 }
3390
3391 /* A pid value greater than 0 breaks the "while" loop. A negative value has
3392 been handled above. A return value of zero means that there is at least one
3393 subprocess, but there are no completed subprocesses. See if any pipes are
3394 ready with any data for reading. */
3395
3396 DEBUG(D_deliver) debug_printf("selecting on subprocess pipes\n");
3397
3398 maxpipe = 0;
3399 FD_ZERO(&select_pipes);
3400 for (poffset = 0; poffset < remote_max_parallel; poffset++)
3401 {
3402 if (parlist[poffset].pid != 0)
3403 {
3404 int fd = parlist[poffset].fd;
3405 FD_SET(fd, &select_pipes);
3406 if (fd > maxpipe) maxpipe = fd;
3407 }
3408 }
3409
3410 /* Stick in a 60-second timeout, just in case. */
3411
3412 tv.tv_sec = 60;
3413 tv.tv_usec = 0;
3414
3415 readycount = select(maxpipe + 1, (SELECT_ARG2_TYPE *)&select_pipes,
3416 NULL, NULL, &tv);
3417
3418 /* Scan through the pipes and read any that are ready; use the count
3419 returned by select() to stop