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