projects / exim.git / blob
? search:
summary | shortlog | log | commit | commitdiff | tree
blame | history | raw | HEAD
tidying
[exim.git] / src / src / transports / smtp.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 #include "../exim.h"
9 #include "smtp.h"
10
11 #define PENDING 256
12 #define PENDING_DEFER (PENDING + DEFER)
13 #define PENDING_OK (PENDING + OK)
14
15
16 /* Options specific to the smtp transport. This transport also supports LMTP
17 over TCP/IP. The options must be in alphabetic order (note that "_" comes
18 before the lower case letters). Some live in the transport_instance block so as
19 to be publicly visible; these are flagged with opt_public. */
20
21 optionlist smtp_transport_options[] = {
22 { "*expand_multi_domain", opt_stringptr | opt_hidden | opt_public,
23 (void *)offsetof(transport_instance, expand_multi_domain) },
24 { "*expand_retry_include_ip_address", opt_stringptr | opt_hidden,
25 (void *)(offsetof(smtp_transport_options_block, expand_retry_include_ip_address)) },
26
27 { "address_retry_include_sender", opt_bool,
28 (void *)offsetof(smtp_transport_options_block, address_retry_include_sender) },
29 { "allow_localhost", opt_bool,
30 (void *)offsetof(smtp_transport_options_block, allow_localhost) },
31 { "authenticated_sender", opt_stringptr,
32 (void *)offsetof(smtp_transport_options_block, authenticated_sender) },
33 { "authenticated_sender_force", opt_bool,
34 (void *)offsetof(smtp_transport_options_block, authenticated_sender_force) },
35 { "command_timeout", opt_time,
36 (void *)offsetof(smtp_transport_options_block, command_timeout) },
37 { "connect_timeout", opt_time,
38 (void *)offsetof(smtp_transport_options_block, connect_timeout) },
39 { "connection_max_messages", opt_int | opt_public,
40 (void *)offsetof(transport_instance, connection_max_messages) },
41 { "data_timeout", opt_time,
42 (void *)offsetof(smtp_transport_options_block, data_timeout) },
43 { "delay_after_cutoff", opt_bool,
44 (void *)offsetof(smtp_transport_options_block, delay_after_cutoff) },
45 #ifndef DISABLE_DKIM
46 { "dkim_canon", opt_stringptr,
47 (void *)offsetof(smtp_transport_options_block, dkim_canon) },
48 { "dkim_domain", opt_stringptr,
49 (void *)offsetof(smtp_transport_options_block, dkim_domain) },
50 { "dkim_private_key", opt_stringptr,
51 (void *)offsetof(smtp_transport_options_block, dkim_private_key) },
52 { "dkim_selector", opt_stringptr,
53 (void *)offsetof(smtp_transport_options_block, dkim_selector) },
54 { "dkim_sign_headers", opt_stringptr,
55 (void *)offsetof(smtp_transport_options_block, dkim_sign_headers) },
56 { "dkim_strict", opt_stringptr,
57 (void *)offsetof(smtp_transport_options_block, dkim_strict) },
58 #endif
59 { "dns_qualify_single", opt_bool,
60 (void *)offsetof(smtp_transport_options_block, dns_qualify_single) },
61 { "dns_search_parents", opt_bool,
62 (void *)offsetof(smtp_transport_options_block, dns_search_parents) },
63 { "dnssec_request_domains", opt_stringptr,
64 (void *)offsetof(smtp_transport_options_block, dnssec_request_domains) },
65 { "dnssec_require_domains", opt_stringptr,
66 (void *)offsetof(smtp_transport_options_block, dnssec_require_domains) },
67 { "dscp", opt_stringptr,
68 (void *)offsetof(smtp_transport_options_block, dscp) },
69 { "fallback_hosts", opt_stringptr,
70 (void *)offsetof(smtp_transport_options_block, fallback_hosts) },
71 { "final_timeout", opt_time,
72 (void *)offsetof(smtp_transport_options_block, final_timeout) },
73 { "gethostbyname", opt_bool,
74 (void *)offsetof(smtp_transport_options_block, gethostbyname) },
75 #ifdef SUPPORT_TLS
76 /* These are no longer honoured, as of Exim 4.80; for now, we silently
77 ignore; 4.83 will warn, and a later-still release will remove
78 these options, so that using them becomes an error. */
79 { "gnutls_require_kx", opt_stringptr,
80 (void *)offsetof(smtp_transport_options_block, gnutls_require_kx) },
81 { "gnutls_require_mac", opt_stringptr,
82 (void *)offsetof(smtp_transport_options_block, gnutls_require_mac) },
83 { "gnutls_require_protocols", opt_stringptr,
84 (void *)offsetof(smtp_transport_options_block, gnutls_require_proto) },
85 #endif
86 { "helo_data", opt_stringptr,
87 (void *)offsetof(smtp_transport_options_block, helo_data) },
88 { "hosts", opt_stringptr,
89 (void *)offsetof(smtp_transport_options_block, hosts) },
90 { "hosts_avoid_esmtp", opt_stringptr,
91 (void *)offsetof(smtp_transport_options_block, hosts_avoid_esmtp) },
92 { "hosts_avoid_pipelining", opt_stringptr,
93 (void *)offsetof(smtp_transport_options_block, hosts_avoid_pipelining) },
94 #ifdef SUPPORT_TLS
95 { "hosts_avoid_tls", opt_stringptr,
96 (void *)offsetof(smtp_transport_options_block, hosts_avoid_tls) },
97 #endif
98 { "hosts_max_try", opt_int,
99 (void *)offsetof(smtp_transport_options_block, hosts_max_try) },
100 { "hosts_max_try_hardlimit", opt_int,
101 (void *)offsetof(smtp_transport_options_block, hosts_max_try_hardlimit) },
102 #ifdef SUPPORT_TLS
103 { "hosts_nopass_tls", opt_stringptr,
104 (void *)offsetof(smtp_transport_options_block, hosts_nopass_tls) },
105 #endif
106 { "hosts_override", opt_bool,
107 (void *)offsetof(smtp_transport_options_block, hosts_override) },
108 { "hosts_randomize", opt_bool,
109 (void *)offsetof(smtp_transport_options_block, hosts_randomize) },
110 #if defined(SUPPORT_TLS) && !defined(DISABLE_OCSP)
111 { "hosts_request_ocsp", opt_stringptr,
112 (void *)offsetof(smtp_transport_options_block, hosts_request_ocsp) },
113 #endif
114 { "hosts_require_auth", opt_stringptr,
115 (void *)offsetof(smtp_transport_options_block, hosts_require_auth) },
116 #ifdef SUPPORT_TLS
117 # ifdef EXPERIMENTAL_DANE
118 { "hosts_require_dane", opt_stringptr,
119 (void *)offsetof(smtp_transport_options_block, hosts_require_dane) },
120 # endif
121 # ifndef DISABLE_OCSP
122 { "hosts_require_ocsp", opt_stringptr,
123 (void *)offsetof(smtp_transport_options_block, hosts_require_ocsp) },
124 # endif
125 { "hosts_require_tls", opt_stringptr,
126 (void *)offsetof(smtp_transport_options_block, hosts_require_tls) },
127 #endif
128 { "hosts_try_auth", opt_stringptr,
129 (void *)offsetof(smtp_transport_options_block, hosts_try_auth) },
130 #if defined(SUPPORT_TLS) && defined(EXPERIMENTAL_DANE)
131 { "hosts_try_dane", opt_stringptr,
132 (void *)offsetof(smtp_transport_options_block, hosts_try_dane) },
133 #endif
134 #ifndef DISABLE_PRDR
135 { "hosts_try_prdr", opt_stringptr,
136 (void *)offsetof(smtp_transport_options_block, hosts_try_prdr) },
137 #endif
138 #ifdef SUPPORT_TLS
139 { "hosts_verify_avoid_tls", opt_stringptr,
140 (void *)offsetof(smtp_transport_options_block, hosts_verify_avoid_tls) },
141 #endif
142 { "interface", opt_stringptr,
143 (void *)offsetof(smtp_transport_options_block, interface) },
144 { "keepalive", opt_bool,
145 (void *)offsetof(smtp_transport_options_block, keepalive) },
146 { "lmtp_ignore_quota", opt_bool,
147 (void *)offsetof(smtp_transport_options_block, lmtp_ignore_quota) },
148 { "max_rcpt", opt_int | opt_public,
149 (void *)offsetof(transport_instance, max_addresses) },
150 { "multi_domain", opt_expand_bool | opt_public,
151 (void *)offsetof(transport_instance, multi_domain) },
152 { "port", opt_stringptr,
153 (void *)offsetof(smtp_transport_options_block, port) },
154 { "protocol", opt_stringptr,
155 (void *)offsetof(smtp_transport_options_block, protocol) },
156 { "retry_include_ip_address", opt_expand_bool,
157 (void *)offsetof(smtp_transport_options_block, retry_include_ip_address) },
158 { "serialize_hosts", opt_stringptr,
159 (void *)offsetof(smtp_transport_options_block, serialize_hosts) },
160 { "size_addition", opt_int,
161 (void *)offsetof(smtp_transport_options_block, size_addition) }
162 #ifdef EXPERIMENTAL_SOCKS
163 ,{ "socks_proxy", opt_stringptr,
164 (void *)offsetof(smtp_transport_options_block, socks_proxy) }
165 #endif
166 #ifdef SUPPORT_TLS
167 ,{ "tls_certificate", opt_stringptr,
168 (void *)offsetof(smtp_transport_options_block, tls_certificate) },
169 { "tls_crl", opt_stringptr,
170 (void *)offsetof(smtp_transport_options_block, tls_crl) },
171 { "tls_dh_min_bits", opt_int,
172 (void *)offsetof(smtp_transport_options_block, tls_dh_min_bits) },
173 { "tls_privatekey", opt_stringptr,
174 (void *)offsetof(smtp_transport_options_block, tls_privatekey) },
175 { "tls_require_ciphers", opt_stringptr,
176 (void *)offsetof(smtp_transport_options_block, tls_require_ciphers) },
177 { "tls_sni", opt_stringptr,
178 (void *)offsetof(smtp_transport_options_block, tls_sni) },
179 { "tls_tempfail_tryclear", opt_bool,
180 (void *)offsetof(smtp_transport_options_block, tls_tempfail_tryclear) },
181 { "tls_try_verify_hosts", opt_stringptr,
182 (void *)offsetof(smtp_transport_options_block, tls_try_verify_hosts) },
183 { "tls_verify_cert_hostnames", opt_stringptr,
184 (void *)offsetof(smtp_transport_options_block,tls_verify_cert_hostnames)},
185 { "tls_verify_certificates", opt_stringptr,
186 (void *)offsetof(smtp_transport_options_block, tls_verify_certificates) },
187 { "tls_verify_hosts", opt_stringptr,
188 (void *)offsetof(smtp_transport_options_block, tls_verify_hosts) }
189 #endif
190 };
191
192 /* Size of the options list. An extern variable has to be used so that its
193 address can appear in the tables drtables.c. */
194
195 int smtp_transport_options_count =
196 sizeof(smtp_transport_options)/sizeof(optionlist);
197
198 /* Default private options block for the smtp transport. */
199
200 smtp_transport_options_block smtp_transport_option_defaults = {
201 NULL, /* hosts */
202 NULL, /* fallback_hosts */
203 NULL, /* hostlist */
204 NULL, /* fallback_hostlist */
205 NULL, /* authenticated_sender */
206 US"$primary_hostname", /* helo_data */
207 NULL, /* interface */
208 NULL, /* port */
209 US"smtp", /* protocol */
210 NULL, /* DSCP */
211 NULL, /* serialize_hosts */
212 NULL, /* hosts_try_auth */
213 NULL, /* hosts_require_auth */
214 #ifdef EXPERIMENTAL_DANE
215 NULL, /* hosts_try_dane */
216 NULL, /* hosts_require_dane */
217 #endif
218 #ifndef DISABLE_PRDR
219 US"*", /* hosts_try_prdr */
220 #endif
221 #ifndef DISABLE_OCSP
222 US"*", /* hosts_request_ocsp (except under DANE; tls_client_start()) */
223 NULL, /* hosts_require_ocsp */
224 #endif
225 NULL, /* hosts_require_tls */
226 NULL, /* hosts_avoid_tls */
227 NULL, /* hosts_verify_avoid_tls */
228 NULL, /* hosts_avoid_pipelining */
229 NULL, /* hosts_avoid_esmtp */
230 NULL, /* hosts_nopass_tls */
231 5*60, /* command_timeout */
232 5*60, /* connect_timeout; shorter system default overrides */
233 5*60, /* data timeout */
234 10*60, /* final timeout */
235 1024, /* size_addition */
236 5, /* hosts_max_try */
237 50, /* hosts_max_try_hardlimit */
238 TRUE, /* address_retry_include_sender */
239 FALSE, /* allow_localhost */
240 FALSE, /* authenticated_sender_force */
241 FALSE, /* gethostbyname */
242 TRUE, /* dns_qualify_single */
243 FALSE, /* dns_search_parents */
244 NULL, /* dnssec_request_domains */
245 NULL, /* dnssec_require_domains */
246 TRUE, /* delay_after_cutoff */
247 FALSE, /* hosts_override */
248 FALSE, /* hosts_randomize */
249 TRUE, /* keepalive */
250 FALSE, /* lmtp_ignore_quota */
251 NULL, /* expand_retry_include_ip_address */
252 TRUE /* retry_include_ip_address */
253 #ifdef EXPERIMENTAL_SOCKS
254 ,NULL /* socks_proxy */
255 #endif
256 #ifdef SUPPORT_TLS
257 ,NULL, /* tls_certificate */
258 NULL, /* tls_crl */
259 NULL, /* tls_privatekey */
260 NULL, /* tls_require_ciphers */
261 NULL, /* gnutls_require_kx */
262 NULL, /* gnutls_require_mac */
263 NULL, /* gnutls_require_proto */
264 NULL, /* tls_sni */
265 US"system", /* tls_verify_certificates */
266 EXIM_CLIENT_DH_DEFAULT_MIN_BITS,
267 /* tls_dh_min_bits */
268 TRUE, /* tls_tempfail_tryclear */
269 NULL, /* tls_verify_hosts */
270 US"*", /* tls_try_verify_hosts */
271 US"*" /* tls_verify_cert_hostnames */
272 #endif
273 #ifndef DISABLE_DKIM
274 ,NULL, /* dkim_canon */
275 NULL, /* dkim_domain */
276 NULL, /* dkim_private_key */
277 NULL, /* dkim_selector */
278 NULL, /* dkim_sign_headers */
279 NULL /* dkim_strict */
280 #endif
281 };
282
283 /* some DSN flags for use later */
284
285 static int rf_list[] = {rf_notify_never, rf_notify_success,
286 rf_notify_failure, rf_notify_delay };
287
288 static uschar *rf_names[] = { US"NEVER", US"SUCCESS", US"FAILURE", US"DELAY" };
289
290
291
292 /* Local statics */
293
294 static uschar *smtp_command; /* Points to last cmd for error messages */
295 static uschar *mail_command; /* Points to MAIL cmd for error messages */
296 static BOOL update_waiting; /* TRUE to update the "wait" database */
297
298
299 /*************************************************
300 * Setup entry point *
301 *************************************************/
302
303 /* This function is called when the transport is about to be used,
304 but before running it in a sub-process. It is used for two things:
305
306 (1) To set the fallback host list in addresses, when delivering.
307 (2) To pass back the interface, port, protocol, and other options, for use
308 during callout verification.
309
310 Arguments:
311 tblock pointer to the transport instance block
312 addrlist list of addresses about to be transported
313 tf if not NULL, pointer to block in which to return options
314 uid the uid that will be set (not used)
315 gid the gid that will be set (not used)
316 errmsg place for error message (not used)
317
318 Returns: OK always (FAIL, DEFER not used)
319 */
320
321 static int
322 smtp_transport_setup(transport_instance *tblock, address_item *addrlist,
323 transport_feedback *tf, uid_t uid, gid_t gid, uschar **errmsg)
324 {
325 smtp_transport_options_block *ob =
326 (smtp_transport_options_block *)(tblock->options_block);
327
328 errmsg = errmsg; /* Keep picky compilers happy */
329 uid = uid;
330 gid = gid;
331
332 /* Pass back options if required. This interface is getting very messy. */
333
334 if (tf != NULL)
335 {
336 tf->interface = ob->interface;
337 tf->port = ob->port;
338 tf->protocol = ob->protocol;
339 tf->hosts = ob->hosts;
340 tf->hosts_override = ob->hosts_override;
341 tf->hosts_randomize = ob->hosts_randomize;
342 tf->gethostbyname = ob->gethostbyname;
343 tf->qualify_single = ob->dns_qualify_single;
344 tf->search_parents = ob->dns_search_parents;
345 tf->helo_data = ob->helo_data;
346 }
347
348 /* Set the fallback host list for all the addresses that don't have fallback
349 host lists, provided that the local host wasn't present in the original host
350 list. */
351
352 if (!testflag(addrlist, af_local_host_removed))
353 {
354 for (; addrlist != NULL; addrlist = addrlist->next)
355 if (addrlist->fallback_hosts == NULL)
356 addrlist->fallback_hosts = ob->fallback_hostlist;
357 }
358
359 return OK;
360 }
361
362
363
364 /*************************************************
365 * Initialization entry point *
366 *************************************************/
367
368 /* Called for each instance, after its options have been read, to
369 enable consistency checks to be done, or anything else that needs
370 to be set up.
371
372 Argument: pointer to the transport instance block
373 Returns: nothing
374 */
375
376 void
377 smtp_transport_init(transport_instance *tblock)
378 {
379 smtp_transport_options_block *ob =
380 (smtp_transport_options_block *)(tblock->options_block);
381
382 /* Retry_use_local_part defaults FALSE if unset */
383
384 if (tblock->retry_use_local_part == TRUE_UNSET)
385 tblock->retry_use_local_part = FALSE;
386
387 /* Set the default port according to the protocol */
388
389 if (ob->port == NULL)
390 ob->port = (strcmpic(ob->protocol, US"lmtp") == 0)? US"lmtp" :
391 (strcmpic(ob->protocol, US"smtps") == 0)? US"smtps" : US"smtp";
392
393 /* Set up the setup entry point, to be called before subprocesses for this
394 transport. */
395
396 tblock->setup = smtp_transport_setup;
397
398 /* Complain if any of the timeouts are zero. */
399
400 if (ob->command_timeout <= 0 || ob->data_timeout <= 0 ||
401 ob->final_timeout <= 0)
402 log_write(0, LOG_PANIC_DIE|LOG_CONFIG,
403 "command, data, or final timeout value is zero for %s transport",
404 tblock->name);
405
406 /* If hosts_override is set and there are local hosts, set the global
407 flag that stops verify from showing router hosts. */
408
409 if (ob->hosts_override && ob->hosts != NULL) tblock->overrides_hosts = TRUE;
410
411 /* If there are any fallback hosts listed, build a chain of host items
412 for them, but do not do any lookups at this time. */
413
414 host_build_hostlist(&(ob->fallback_hostlist), ob->fallback_hosts, FALSE);
415
416 #ifdef SUPPORT_TLS
417 if ( ob->gnutls_require_kx
418 || ob->gnutls_require_mac
419 || ob->gnutls_require_proto)
420 log_write(0, LOG_MAIN, "WARNING: smtp transport options"
421 " gnutls_require_kx, gnutls_require_mac and gnutls_require_protocols"
422 " are obsolete\n");
423 #endif
424 }
425
426
427
428
429
430 /*************************************************
431 * Set delivery info into all active addresses *
432 *************************************************/
433
434 /* Only addresses whose status is >= PENDING are relevant. A lesser
435 status means that an address is not currently being processed.
436
437 Arguments:
438 addrlist points to a chain of addresses
439 errno_value to put in each address's errno field
440 msg to put in each address's message field
441 rc to put in each address's transport_return field
442 pass_message if TRUE, set the "pass message" flag in the address
443 host if set, mark addrs as having used this host
444
445 If errno_value has the special value ERRNO_CONNECTTIMEOUT, ETIMEDOUT is put in
446 the errno field, and RTEF_CTOUT is ORed into the more_errno field, to indicate
447 this particular type of timeout.
448
449 Returns: nothing
450 */
451
452 static void
453 set_errno(address_item *addrlist, int errno_value, uschar *msg, int rc,
454 BOOL pass_message, host_item * host)
455 {
456 address_item *addr;
457 int orvalue = 0;
458 if (errno_value == ERRNO_CONNECTTIMEOUT)
459 {
460 errno_value = ETIMEDOUT;
461 orvalue = RTEF_CTOUT;
462 }
463 for (addr = addrlist; addr != NULL; addr = addr->next)
464 if (addr->transport_return >= PENDING)
465 {
466 addr->basic_errno = errno_value;
467 addr->more_errno |= orvalue;
468 if (msg != NULL)
469 {
470 addr->message = msg;
471 if (pass_message) setflag(addr, af_pass_message);
472 }
473 addr->transport_return = rc;
474 if (host)
475 addr->host_used = host;
476 }
477 }
478
479
480
481 /*************************************************
482 * Check an SMTP response *
483 *************************************************/
484
485 /* This function is given an errno code and the SMTP response buffer
486 to analyse, together with the host identification for generating messages. It
487 sets an appropriate message and puts the first digit of the response code into
488 the yield variable. If no response was actually read, a suitable digit is
489 chosen.
490
491 Arguments:
492 host the current host, to get its name for messages
493 errno_value pointer to the errno value
494 more_errno from the top address for use with ERRNO_FILTER_FAIL
495 buffer the SMTP response buffer
496 yield where to put a one-digit SMTP response code
497 message where to put an errror message
498 pass_message set TRUE if message is an SMTP response
499
500 Returns: TRUE if an SMTP "QUIT" command should be sent, else FALSE
501 */
502
503 static BOOL
504 check_response(host_item *host, int *errno_value, int more_errno,
505 uschar *buffer, int *yield, uschar **message, BOOL *pass_message)
506 {
507 uschar *pl = US"";
508
509 if (smtp_use_pipelining &&
510 (Ustrcmp(smtp_command, "MAIL") == 0 ||
511 Ustrcmp(smtp_command, "RCPT") == 0 ||
512 Ustrcmp(smtp_command, "DATA") == 0))
513 pl = US"pipelined ";
514
515 *yield = '4'; /* Default setting is to give a temporary error */
516
517 /* Handle response timeout */
518
519 if (*errno_value == ETIMEDOUT)
520 {
521 *message = US string_sprintf("SMTP timeout after %s%s",
522 pl, smtp_command);
523 if (transport_count > 0)
524 *message = US string_sprintf("%s (%d bytes written)", *message,
525 transport_count);
526 return FALSE;
527 }
528
529 /* Handle malformed SMTP response */
530
531 if (*errno_value == ERRNO_SMTPFORMAT)
532 {
533 const uschar *malfresp = string_printing(buffer);
534 while (isspace(*malfresp)) malfresp++;
535 *message = *malfresp == 0
536 ? string_sprintf("Malformed SMTP reply (an empty line) "
537 "in response to %s%s", pl, smtp_command)
538 : string_sprintf("Malformed SMTP reply in response to %s%s: %s",
539 pl, smtp_command, malfresp);
540 return FALSE;
541 }
542
543 /* Handle a failed filter process error; can't send QUIT as we mustn't
544 end the DATA. */
545
546 if (*errno_value == ERRNO_FILTER_FAIL)
547 {
548 *message = US string_sprintf("transport filter process failed (%d)%s",
549 more_errno,
550 (more_errno == EX_EXECFAILED)? ": unable to execute command" : "");
551 return FALSE;
552 }
553
554 /* Handle a failed add_headers expansion; can't send QUIT as we mustn't
555 end the DATA. */
556
557 if (*errno_value == ERRNO_CHHEADER_FAIL)
558 {
559 *message =
560 US string_sprintf("failed to expand headers_add or headers_remove: %s",
561 expand_string_message);
562 return FALSE;
563 }
564
565 /* Handle failure to write a complete data block */
566
567 if (*errno_value == ERRNO_WRITEINCOMPLETE)
568 {
569 *message = US string_sprintf("failed to write a data block");
570 return FALSE;
571 }
572
573 #ifdef EXPERIMENTAL_INTERNATIONAL
574 /* Handle lack of advertised SMTPUTF8, for international message */
575 if (*errno_value == ERRNO_UTF8_FWD)
576 {
577 *message = US string_sprintf("utf8 support required but not offered for forwarding");
578 DEBUG(D_deliver|D_transport) debug_printf("%s\n", *message);
579 return TRUE;
580 }
581 #endif
582
583 /* Handle error responses from the remote mailer. */
584
585 if (buffer[0] != 0)
586 {
587 const uschar *s = string_printing(buffer);
588 *message = US string_sprintf("SMTP error from remote mail server after %s%s: "
589 "%s", pl, smtp_command, s);
590 *pass_message = TRUE;
591 *yield = buffer[0];
592 return TRUE;
593 }
594
595 /* No data was read. If there is no errno, this must be the EOF (i.e.
596 connection closed) case, which causes deferral. An explicit connection reset
597 error has the same effect. Otherwise, put the host's identity in the message,
598 leaving the errno value to be interpreted as well. In all cases, we have to
599 assume the connection is now dead. */
600
601 if (*errno_value == 0 || *errno_value == ECONNRESET)
602 {
603 *errno_value = ERRNO_SMTPCLOSED;
604 *message = US string_sprintf("Remote host closed connection "
605 "in response to %s%s", pl, smtp_command);
606 }
607 else *message = US string_sprintf("%s [%s]", host->name, host->address);
608
609 return FALSE;
610 }
611
612
613
614 /*************************************************
615 * Write error message to logs *
616 *************************************************/
617
618 /* This writes to the main log and to the message log.
619
620 Arguments:
621 addr the address item containing error information
622 host the current host
623
624 Returns: nothing
625 */
626
627 static void
628 write_logs(address_item *addr, host_item *host)
629 {
630 uschar * message = string_sprintf("H=%s [%s]", host->name, host->address);
631
632 if (addr->message)
633 {
634 message = string_sprintf("%s: %s", message, addr->message);
635 if (addr->basic_errno > 0)
636 message = string_sprintf("%s: %s", message, strerror(addr->basic_errno));
637 log_write(0, LOG_MAIN, "%s", message);
638 deliver_msglog("%s %s\n", tod_stamp(tod_log), message);
639 }
640 else
641 {
642 if (log_extra_selector & LX_outgoing_port)
643 message = string_sprintf("%s:%d", message,
644 host->port == PORT_NONE ? 25 : host->port);
645 log_write(0, LOG_MAIN, "%s %s", message, strerror(addr->basic_errno));
646 deliver_msglog("%s %s %s\n", tod_stamp(tod_log), message,
647 strerror(addr->basic_errno));
648 }
649 }
650
651 static void
652 msglog_line(host_item * host, uschar * message)
653 {
654 deliver_msglog("%s H=%s [%s] %s\n", tod_stamp(tod_log),
655 host->name, host->address, message);
656 }
657
658
659
660 #ifdef EXPERIMENTAL_EVENT
661 /*************************************************
662 * Post-defer action *
663 *************************************************/
664
665 /* This expands an arbitrary per-transport string.
666 It might, for example, be used to write to the database log.
667
668 Arguments:
669 addr the address item containing error information
670 host the current host
671
672 Returns: nothing
673 */
674
675 static void
676 deferred_event_raise(address_item *addr, host_item *host)
677 {
678 uschar * action = addr->transport->event_action;
679 const uschar * save_domain;
680 uschar * save_local;
681
682 if (!action)
683 return;
684
685 save_domain = deliver_domain;
686 save_local = deliver_localpart;
687
688 /*XXX would ip & port already be set up? */
689 deliver_host_address = string_copy(host->address);
690 deliver_host_port = host->port == PORT_NONE ? 25 : host->port;
691 event_defer_errno = addr->basic_errno;
692
693 router_name = addr->router->name;
694 transport_name = addr->transport->name;
695 deliver_domain = addr->domain;
696 deliver_localpart = addr->local_part;
697
698 (void) event_raise(action, US"msg:host:defer",
699 addr->message
700 ? addr->basic_errno > 0
701 ? string_sprintf("%s: %s", addr->message, strerror(addr->basic_errno))
702 : string_copy(addr->message)
703 : addr->basic_errno > 0
704 ? string_copy(US strerror(addr->basic_errno))
705 : NULL);
706
707 deliver_localpart = save_local;
708 deliver_domain = save_domain;
709 router_name = transport_name = NULL;
710 }
711 #endif
712
713 /*************************************************
714 * Synchronize SMTP responses *
715 *************************************************/
716
717 /* This function is called from smtp_deliver() to receive SMTP responses from
718 the server, and match them up with the commands to which they relate. When
719 PIPELINING is not in use, this function is called after every command, and is
720 therefore somewhat over-engineered, but it is simpler to use a single scheme
721 that works both with and without PIPELINING instead of having two separate sets
722 of code.
723
724 The set of commands that are buffered up with pipelining may start with MAIL
725 and may end with DATA; in between are RCPT commands that correspond to the
726 addresses whose status is PENDING_DEFER. All other commands (STARTTLS, AUTH,
727 etc.) are never buffered.
728
729 Errors after MAIL or DATA abort the whole process leaving the response in the
730 buffer. After MAIL, pending responses are flushed, and the original command is
731 re-instated in big_buffer for error messages. For RCPT commands, the remote is
732 permitted to reject some recipient addresses while accepting others. However
733 certain errors clearly abort the whole process. Set the value in
734 transport_return to PENDING_OK if the address is accepted. If there is a
735 subsequent general error, it will get reset accordingly. If not, it will get
736 converted to OK at the end.
737
738 Arguments:
739 addrlist the complete address list
740 include_affixes TRUE if affixes include in RCPT
741 sync_addr ptr to the ptr of the one to start scanning at (updated)
742 host the host we are connected to
743 count the number of responses to read
744 address_retry_
745 include_sender true if 4xx retry is to include the sender it its key
746 pending_MAIL true if the first response is for MAIL
747 pending_DATA 0 if last command sent was not DATA
748 +1 if previously had a good recipient
749 -1 if not previously had a good recipient
750 inblock incoming SMTP block
751 timeout timeout value
752 buffer buffer for reading response
753 buffsize size of buffer
754
755 Returns: 3 if at least one address had 2xx and one had 5xx
756 2 if at least one address had 5xx but none had 2xx
757 1 if at least one host had a 2xx response, but none had 5xx
758 0 no address had 2xx or 5xx but no errors (all 4xx, or just DATA)
759 -1 timeout while reading RCPT response
760 -2 I/O or other non-response error for RCPT
761 -3 DATA or MAIL failed - errno and buffer set
762 */
763
764 static int
765 sync_responses(address_item *addrlist, BOOL include_affixes,
766 address_item **sync_addr, host_item *host, int count,
767 BOOL address_retry_include_sender, BOOL pending_MAIL,
768 int pending_DATA, smtp_inblock *inblock, int timeout, uschar *buffer,
769 int buffsize)
770 {
771 address_item *addr = *sync_addr;
772 int yield = 0;
773
774 /* Handle the response for a MAIL command. On error, reinstate the original
775 command in big_buffer for error message use, and flush any further pending
776 responses before returning, except after I/O errors and timeouts. */
777
778 if (pending_MAIL)
779 {
780 count--;
781 if (!smtp_read_response(inblock, buffer, buffsize, '2', timeout))
782 {
783 Ustrcpy(big_buffer, mail_command); /* Fits, because it came from there! */
784 if (errno == 0 && buffer[0] != 0)
785 {
786 uschar flushbuffer[4096];
787 int save_errno = 0;
788 if (buffer[0] == '4')
789 {
790 save_errno = ERRNO_MAIL4XX;
791 addr->more_errno |= ((buffer[1] - '0')*10 + buffer[2] - '0') << 8;
792 }
793 while (count-- > 0)
794 {
795 if (!smtp_read_response(inblock, flushbuffer, sizeof(flushbuffer),
796 '2', timeout)
797 && (errno != 0 || flushbuffer[0] == 0))
798 break;
799 }
800 errno = save_errno;
801 }
802
803 if (pending_DATA) count--; /* Number of RCPT responses to come */
804 while (count-- > 0) /* Mark any pending addrs with the host used */
805 {
806 while (addr->transport_return != PENDING_DEFER) addr = addr->next;
807 addr->host_used = host;
808 addr = addr->next;
809 }
810 return -3;
811 }
812 }
813
814 if (pending_DATA) count--; /* Number of RCPT responses to come */
815
816 /* Read and handle the required number of RCPT responses, matching each one up
817 with an address by scanning for the next address whose status is PENDING_DEFER.
818 */
819
820 while (count-- > 0)
821 {
822 while (addr->transport_return != PENDING_DEFER) addr = addr->next;
823
824 /* The address was accepted */
825 addr->host_used = host;
826
827 if (smtp_read_response(inblock, buffer, buffsize, '2', timeout))
828 {
829 yield |= 1;
830 addr->transport_return = PENDING_OK;
831
832 /* If af_dr_retry_exists is set, there was a routing delay on this address;
833 ensure that any address-specific retry record is expunged. We do this both
834 for the basic key and for the version that also includes the sender. */
835
836 if (testflag(addr, af_dr_retry_exists))
837 {
838 uschar *altkey = string_sprintf("%s:<%s>", addr->address_retry_key,
839 sender_address);
840 retry_add_item(addr, altkey, rf_delete);
841 retry_add_item(addr, addr->address_retry_key, rf_delete);
842 }
843 }
844
845 /* Timeout while reading the response */
846
847 else if (errno == ETIMEDOUT)
848 {
849 uschar *message = string_sprintf("SMTP timeout after RCPT TO:<%s>",
850 transport_rcpt_address(addr, include_affixes));
851 set_errno(addrlist, ETIMEDOUT, message, DEFER, FALSE, NULL);
852 retry_add_item(addr, addr->address_retry_key, 0);
853 update_waiting = FALSE;
854 return -1;
855 }
856
857 /* Handle other errors in obtaining an SMTP response by returning -1. This
858 will cause all the addresses to be deferred. Restore the SMTP command in
859 big_buffer for which we are checking the response, so the error message
860 makes sense. */
861
862 else if (errno != 0 || buffer[0] == 0)
863 {
864 string_format(big_buffer, big_buffer_size, "RCPT TO:<%s>",
865 transport_rcpt_address(addr, include_affixes));
866 return -2;
867 }
868
869 /* Handle SMTP permanent and temporary response codes. */
870
871 else
872 {
873 addr->message =
874 string_sprintf("SMTP error from remote mail server after RCPT TO:<%s>: "
875 "%s", transport_rcpt_address(addr, include_affixes),
876 string_printing(buffer));
877 setflag(addr, af_pass_message);
878 msglog_line(host, addr->message);
879
880 /* The response was 5xx */
881
882 if (buffer[0] == '5')
883 {
884 addr->transport_return = FAIL;
885 yield |= 2;
886 }
887
888 /* The response was 4xx */
889
890 else
891 {
892 addr->transport_return = DEFER;
893 addr->basic_errno = ERRNO_RCPT4XX;
894 addr->more_errno |= ((buffer[1] - '0')*10 + buffer[2] - '0') << 8;
895
896 /* Log temporary errors if there are more hosts to be tried.
897 If not, log this last one in the == line. */
898
899 if (host->next)
900 log_write(0, LOG_MAIN, "H=%s [%s]: %s", host->name, host->address, addr->message);
901
902 /* Do not put this message on the list of those waiting for specific
903 hosts, as otherwise it is likely to be tried too often. */
904
905 update_waiting = FALSE;
906
907 /* Add a retry item for the address so that it doesn't get tried again
908 too soon. If address_retry_include_sender is true, add the sender address
909 to the retry key. */
910
911 if (address_retry_include_sender)
912 {
913 uschar *altkey = string_sprintf("%s:<%s>", addr->address_retry_key,
914 sender_address);
915 retry_add_item(addr, altkey, 0);
916 }
917 else retry_add_item(addr, addr->address_retry_key, 0);
918 }
919 }
920 } /* Loop for next RCPT response */
921
922 /* Update where to start at for the next block of responses, unless we
923 have already handled all the addresses. */
924
925 if (addr != NULL) *sync_addr = addr->next;
926
927 /* Handle a response to DATA. If we have not had any good recipients, either
928 previously or in this block, the response is ignored. */
929
930 if (pending_DATA != 0 &&
931 !smtp_read_response(inblock, buffer, buffsize, '3', timeout))
932 {
933 int code;
934 uschar *msg;
935 BOOL pass_message;
936 if (pending_DATA > 0 || (yield & 1) != 0)
937 {
938 if (errno == 0 && buffer[0] == '4')
939 {
940 errno = ERRNO_DATA4XX;
941 addrlist->more_errno |= ((buffer[1] - '0')*10 + buffer[2] - '0') << 8;
942 }
943 return -3;
944 }
945 (void)check_response(host, &errno, 0, buffer, &code, &msg, &pass_message);
946 DEBUG(D_transport) debug_printf("%s\nerror for DATA ignored: pipelining "
947 "is in use and there were no good recipients\n", msg);
948 }
949
950 /* All responses read and handled; MAIL (if present) received 2xx and DATA (if
951 present) received 3xx. If any RCPTs were handled and yielded anything other
952 than 4xx, yield will be set non-zero. */
953
954 return yield;
955 }
956
957
958
959 /* Do the client side of smtp-level authentication */
960 /*
961 Arguments:
962 buffer EHLO response from server (gets overwritten)
963 addrlist chain of potential addresses to deliver
964 host host to deliver to
965 ob transport options
966 ibp, obp comms channel control blocks
967
968 Returns:
969 OK Success, or failed (but not required): global "smtp_authenticated" set
970 DEFER Failed authentication (and was required)
971 ERROR Internal problem
972
973 FAIL_SEND Failed communications - transmit
974 FAIL - response
975 */
976
977 int
978 smtp_auth(uschar *buffer, unsigned bufsize, address_item *addrlist, host_item *host,
979 smtp_transport_options_block *ob, BOOL is_esmtp,
980 smtp_inblock *ibp, smtp_outblock *obp)
981 {
982 int require_auth;
983 uschar *fail_reason = US"server did not advertise AUTH support";
984
985 smtp_authenticated = FALSE;
986 client_authenticator = client_authenticated_id = client_authenticated_sender = NULL;
987 require_auth = verify_check_given_host(&ob->hosts_require_auth, host);
988
989 if (is_esmtp && !regex_AUTH) regex_AUTH =
990 regex_must_compile(US"\\n250[\\s\\-]AUTH\\s+([\\-\\w\\s]+)(?:\\n|$)",
991 FALSE, TRUE);
992
993 if (is_esmtp && regex_match_and_setup(regex_AUTH, buffer, 0, -1))
994 {
995 uschar *names = string_copyn(expand_nstring[1], expand_nlength[1]);
996 expand_nmax = -1; /* reset */
997
998 /* Must not do this check until after we have saved the result of the
999 regex match above. */
1000
1001 if (require_auth == OK ||
1002 verify_check_given_host(&ob->hosts_try_auth, host) == OK)
1003 {
1004 auth_instance *au;
1005 fail_reason = US"no common mechanisms were found";
1006
1007 DEBUG(D_transport) debug_printf("scanning authentication mechanisms\n");
1008
1009 /* Scan the configured authenticators looking for one which is configured
1010 for use as a client, which is not suppressed by client_condition, and
1011 whose name matches an authentication mechanism supported by the server.
1012 If one is found, attempt to authenticate by calling its client function.
1013 */
1014
1015 for (au = auths; !smtp_authenticated && au != NULL; au = au->next)
1016 {
1017 uschar *p = names;
1018 if (!au->client ||
1019 (au->client_condition != NULL &&
1020 !expand_check_condition(au->client_condition, au->name,
1021 US"client authenticator")))
1022 {
1023 DEBUG(D_transport) debug_printf("skipping %s authenticator: %s\n",
1024 au->name,
1025 (au->client)? "client_condition is false" :
1026 "not configured as a client");
1027 continue;
1028 }
1029
1030 /* Loop to scan supported server mechanisms */
1031
1032 while (*p != 0)
1033 {
1034 int rc;
1035 int len = Ustrlen(au->public_name);
1036 while (isspace(*p)) p++;
1037
1038 if (strncmpic(au->public_name, p, len) != 0 ||
1039 (p[len] != 0 && !isspace(p[len])))
1040 {
1041 while (*p != 0 && !isspace(*p)) p++;
1042 continue;
1043 }
1044
1045 /* Found data for a listed mechanism. Call its client entry. Set
1046 a flag in the outblock so that data is overwritten after sending so
1047 that reflections don't show it. */
1048
1049 fail_reason = US"authentication attempt(s) failed";
1050 obp->authenticating = TRUE;
1051 rc = (au->info->clientcode)(au, ibp, obp,
1052 ob->command_timeout, buffer, bufsize);
1053 obp->authenticating = FALSE;
1054 DEBUG(D_transport) debug_printf("%s authenticator yielded %d\n",
1055 au->name, rc);
1056
1057 /* A temporary authentication failure must hold up delivery to
1058 this host. After a permanent authentication failure, we carry on
1059 to try other authentication methods. If all fail hard, try to
1060 deliver the message unauthenticated unless require_auth was set. */
1061
1062 switch(rc)
1063 {
1064 case OK:
1065 smtp_authenticated = TRUE; /* stops the outer loop */
1066 client_authenticator = au->name;
1067 if (au->set_client_id != NULL)
1068 client_authenticated_id = expand_string(au->set_client_id);
1069 break;
1070
1071 /* Failure after writing a command */
1072
1073 case FAIL_SEND:
1074 return FAIL_SEND;
1075
1076 /* Failure after reading a response */
1077
1078 case FAIL:
1079 if (errno != 0 || buffer[0] != '5') return FAIL;
1080 log_write(0, LOG_MAIN, "%s authenticator failed H=%s [%s] %s",
1081 au->name, host->name, host->address, buffer);
1082 break;
1083
1084 /* Failure by some other means. In effect, the authenticator
1085 decided it wasn't prepared to handle this case. Typically this
1086 is the result of "fail" in an expansion string. Do we need to
1087 log anything here? Feb 2006: a message is now put in the buffer
1088 if logging is required. */
1089
1090 case CANCELLED:
1091 if (*buffer != 0)
1092 log_write(0, LOG_MAIN, "%s authenticator cancelled "
1093 "authentication H=%s [%s] %s", au->name, host->name,
1094 host->address, buffer);
1095 break;
1096
1097 /* Internal problem, message in buffer. */
1098
1099 case ERROR:
1100 set_errno(addrlist, ERRNO_AUTHPROB, string_copy(buffer),
1101 DEFER, FALSE, NULL);
1102 return ERROR;
1103 }
1104
1105 break; /* If not authenticated, try next authenticator */
1106 } /* Loop for scanning supported server mechanisms */
1107 } /* Loop for further authenticators */
1108 }
1109 }
1110
1111 /* If we haven't authenticated, but are required to, give up. */
1112
1113 if (require_auth == OK && !smtp_authenticated)
1114 {
1115 set_errno(addrlist, ERRNO_AUTHFAIL,
1116 string_sprintf("authentication required but %s", fail_reason), DEFER,
1117 FALSE, NULL);
1118 return DEFER;
1119 }
1120
1121 return OK;
1122 }
1123
1124
1125 /* Construct AUTH appendix string for MAIL TO */
1126 /*
1127 Arguments
1128 buffer to build string
1129 addrlist chain of potential addresses to deliver
1130 ob transport options
1131
1132 Globals smtp_authenticated
1133 client_authenticated_sender
1134 Return True on error, otherwise buffer has (possibly empty) terminated string
1135 */
1136
1137 BOOL
1138 smtp_mail_auth_str(uschar *buffer, unsigned bufsize, address_item *addrlist,
1139 smtp_transport_options_block *ob)
1140 {
1141 uschar *local_authenticated_sender = authenticated_sender;
1142
1143 #ifdef notdef
1144 debug_printf("smtp_mail_auth_str: as<%s> os<%s> SA<%s>\n", authenticated_sender, ob->authenticated_sender, smtp_authenticated?"Y":"N");
1145 #endif
1146
1147 if (ob->authenticated_sender != NULL)
1148 {
1149 uschar *new = expand_string(ob->authenticated_sender);
1150 if (new == NULL)
1151 {
1152 if (!expand_string_forcedfail)
1153 {
1154 uschar *message = string_sprintf("failed to expand "
1155 "authenticated_sender: %s", expand_string_message);
1156 set_errno(addrlist, ERRNO_EXPANDFAIL, message, DEFER, FALSE, NULL);
1157 return TRUE;
1158 }
1159 }
1160 else if (new[0] != 0) local_authenticated_sender = new;
1161 }
1162
1163 /* Add the authenticated sender address if present */
1164
1165 if ((smtp_authenticated || ob->authenticated_sender_force) &&
1166 local_authenticated_sender != NULL)
1167 {
1168 string_format(buffer, bufsize, " AUTH=%s",
1169 auth_xtextencode(local_authenticated_sender,
1170 Ustrlen(local_authenticated_sender)));
1171 client_authenticated_sender = string_copy(local_authenticated_sender);
1172 }
1173 else
1174 *buffer= 0;
1175
1176 return FALSE;
1177 }
1178
1179
1180
1181 #ifdef EXPERIMENTAL_DANE
1182 int
1183 tlsa_lookup(const host_item * host, dns_answer * dnsa,
1184 BOOL dane_required, BOOL * dane)
1185 {
1186 /* move this out to host.c given the similarity to dns_lookup() ? */
1187 uschar buffer[300];
1188 const uschar * fullname = buffer;
1189
1190 /* TLSA lookup string */
1191 (void)sprintf(CS buffer, "_%d._tcp.%.256s", host->port, host->name);
1192
1193 switch (dns_lookup(dnsa, buffer, T_TLSA, &fullname))
1194 {
1195 case DNS_AGAIN:
1196 return DEFER; /* just defer this TLS'd conn */
1197
1198 default:
1199 case DNS_FAIL:
1200 if (dane_required)
1201 {
1202 log_write(0, LOG_MAIN, "DANE error: TLSA lookup failed");
1203 return FAIL;
1204 }
1205 break;
1206
1207 case DNS_SUCCEED:
1208 if (!dns_is_secure(dnsa))
1209 {
1210 log_write(0, LOG_MAIN, "DANE error: TLSA lookup not DNSSEC");
1211 return DEFER;
1212 }
1213 *dane = TRUE;
1214 break;
1215 }
1216 return OK;
1217 }
1218 #endif
1219
1220
1221
1222 typedef struct smtp_compare_s
1223 {
1224 uschar *current_sender_address;
1225 struct transport_instance *tblock;
1226 } smtp_compare_t;
1227
1228 /*
1229 Create a unique string that identifies this message, it is based on
1230 sender_address, helo_data and tls_certificate if enabled. */
1231
1232 static uschar *
1233 smtp_local_identity(uschar * sender, struct transport_instance * tblock)
1234 {
1235 address_item * addr1;
1236 uschar * if1 = US"";
1237 uschar * helo1 = US"";
1238 #ifdef SUPPORT_TLS
1239 uschar * tlsc1 = US"";
1240 #endif
1241 uschar * save_sender_address = sender_address;
1242 uschar * local_identity = NULL;
1243 smtp_transport_options_block * ob =
1244 (smtp_transport_options_block *)tblock->options_block;
1245
1246 sender_address = sender;
1247
1248 addr1 = deliver_make_addr (sender, TRUE);
1249 deliver_set_expansions(addr1);
1250
1251 if (ob->interface)
1252 if1 = expand_string(ob->interface);
1253
1254 if (ob->helo_data)
1255 helo1 = expand_string(ob->helo_data);
1256
1257 #ifdef SUPPORT_TLS
1258 if (ob->tls_certificate)
1259 tlsc1 = expand_string(ob->tls_certificate);
1260 local_identity = string_sprintf ("%s^%s^%s", if1, helo1, tlsc1);
1261 #else
1262 local_identity = string_sprintf ("%s^%s", if1, helo1);
1263 #endif
1264
1265 deliver_set_expansions(NULL);
1266 sender_address = save_sender_address;
1267
1268 return local_identity;
1269 }
1270
1271
1272
1273 /* This routine is a callback that is called from transport_check_waiting.
1274 This function will evaluate the incoming message versus the previous
1275 message. If the incoming message is using a different local identity then
1276 we will veto this new message. */
1277
1278 static BOOL
1279 smtp_are_same_identities(uschar * message_id, smtp_compare_t * s_compare)
1280 {
1281 uschar * save_sender_address = sender_address;
1282 uschar * current_local_identity =
1283 smtp_local_identity(s_compare->current_sender_address, s_compare->tblock);
1284 uschar * new_sender_address = deliver_get_sender_address(message_id);
1285 uschar * message_local_identity =
1286 smtp_local_identity(new_sender_address, s_compare->tblock);
1287
1288 sender_address = save_sender_address;
1289
1290 return Ustrcmp(current_local_identity, message_local_identity) == 0;
1291 }
1292
1293
1294
1295 /*************************************************
1296 * Deliver address list to given host *
1297 *************************************************/
1298
1299 /* If continue_hostname is not null, we get here only when continuing to
1300 deliver down an existing channel. The channel was passed as the standard
1301 input. TLS is never active on a passed channel; the previous process always
1302 closes it down before passing the connection on.
1303
1304 Otherwise, we have to make a connection to the remote host, and do the
1305 initial protocol exchange.
1306
1307 When running as an MUA wrapper, if the sender or any recipient is rejected,
1308 temporarily or permanently, we force failure for all recipients.
1309
1310 Arguments:
1311 addrlist chain of potential addresses to deliver; only those whose
1312 transport_return field is set to PENDING_DEFER are currently
1313 being processed; others should be skipped - they have either
1314 been delivered to an earlier host or IP address, or been
1315 failed by one of them.
1316 host host to deliver to
1317 host_af AF_INET or AF_INET6
1318 port default TCP/IP port to use, in host byte order
1319 interface interface to bind to, or NULL
1320 tblock transport instance block
1321 message_defer set TRUE if yield is OK, but all addresses were deferred
1322 because of a non-recipient, non-host failure, that is, a
1323 4xx response to MAIL FROM, DATA, or ".". This is a defer
1324 that is specific to the message.
1325 suppress_tls if TRUE, don't attempt a TLS connection - this is set for
1326 a second attempt after TLS initialization fails
1327
1328 Returns: OK - the connection was made and the delivery attempted;
1329 the result for each address is in its data block.
1330 DEFER - the connection could not be made, or something failed
1331 while setting up the SMTP session, or there was a
1332 non-message-specific error, such as a timeout.
1333 ERROR - a filter command is specified for this transport,
1334 and there was a problem setting it up; OR helo_data
1335 or add_headers or authenticated_sender is specified
1336 for this transport, and the string failed to expand
1337 */
1338
1339 static int
1340 smtp_deliver(address_item *addrlist, host_item *host, int host_af, int port,
1341 uschar *interface, transport_instance *tblock,
1342 BOOL *message_defer, BOOL suppress_tls)
1343 {
1344 address_item *addr;
1345 address_item *sync_addr;
1346 address_item *first_addr = addrlist;
1347 int yield = OK;
1348 int address_count;
1349 int save_errno;
1350 int rc;
1351 time_t start_delivery_time = time(NULL);
1352 smtp_transport_options_block *ob =
1353 (smtp_transport_options_block *)(tblock->options_block);
1354 BOOL lmtp = strcmpic(ob->protocol, US"lmtp") == 0;
1355 BOOL smtps = strcmpic(ob->protocol, US"smtps") == 0;
1356 BOOL ok = FALSE;
1357 BOOL send_rset = TRUE;
1358 BOOL send_quit = TRUE;
1359 BOOL setting_up = TRUE;
1360 BOOL completed_address = FALSE;
1361 BOOL esmtp = TRUE;
1362 BOOL pending_MAIL;
1363 BOOL pass_message = FALSE;
1364 #ifndef DISABLE_PRDR
1365 BOOL prdr_offered = FALSE;
1366 BOOL prdr_active;
1367 #endif
1368 #ifdef EXPERIMENTAL_INTERNATIONAL
1369 BOOL utf8_needed = FALSE;
1370 BOOL utf8_offered = FALSE;
1371 #endif
1372 BOOL dsn_all_lasthop = TRUE;
1373 #if defined(SUPPORT_TLS) && defined(EXPERIMENTAL_DANE)
1374 BOOL dane = FALSE;
1375 BOOL dane_required;
1376 dns_answer tlsa_dnsa;
1377 #endif
1378 smtp_inblock inblock;
1379 smtp_outblock outblock;
1380 int max_rcpt = tblock->max_addresses;
1381 uschar *igquotstr = US"";
1382
1383 uschar *helo_data = NULL;
1384
1385 uschar *message = NULL;
1386 uschar new_message_id[MESSAGE_ID_LENGTH + 1];
1387 uschar *p;
1388 uschar buffer[4096];
1389 uschar inbuffer[4096];
1390 uschar outbuffer[4096];
1391
1392 suppress_tls = suppress_tls; /* stop compiler warning when no TLS support */
1393
1394 *message_defer = FALSE;
1395 smtp_command = US"initial connection";
1396 if (max_rcpt == 0) max_rcpt = 999999;
1397
1398 /* Set up the buffer for reading SMTP response packets. */
1399
1400 inblock.buffer = inbuffer;
1401 inblock.buffersize = sizeof(inbuffer);
1402 inblock.ptr = inbuffer;
1403 inblock.ptrend = inbuffer;
1404
1405 /* Set up the buffer for holding SMTP commands while pipelining */
1406
1407 outblock.buffer = outbuffer;
1408 outblock.buffersize = sizeof(outbuffer);
1409 outblock.ptr = outbuffer;
1410 outblock.cmd_count = 0;
1411 outblock.authenticating = FALSE;
1412
1413 /* Reset the parameters of a TLS session. */
1414
1415 tls_out.bits = 0;
1416 tls_out.cipher = NULL; /* the one we may use for this transport */
1417 tls_out.ourcert = NULL;
1418 tls_out.peercert = NULL;
1419 tls_out.peerdn = NULL;
1420 #if defined(SUPPORT_TLS) && !defined(USE_GNUTLS)
1421 tls_out.sni = NULL;
1422 #endif
1423 tls_out.ocsp = OCSP_NOT_REQ;
1424
1425 /* Flip the legacy TLS-related variables over to the outbound set in case
1426 they're used in the context of the transport. Don't bother resetting
1427 afterward as we're in a subprocess. */
1428
1429 tls_modify_variables(&tls_out);
1430
1431 #ifndef SUPPORT_TLS
1432 if (smtps)
1433 {
1434 set_errno(addrlist, ERRNO_TLSFAILURE, US"TLS support not available",
1435 DEFER, FALSE, NULL);
1436 return ERROR;
1437 }
1438 #endif
1439
1440 /* Make a connection to the host if this isn't a continued delivery, and handle
1441 the initial interaction and HELO/EHLO/LHLO. Connect timeout errors are handled
1442 specially so they can be identified for retries. */
1443
1444 if (continue_hostname == NULL)
1445 {
1446 /* This puts port into host->port */
1447 inblock.sock = outblock.sock =
1448 smtp_connect(host, host_af, port, interface, ob->connect_timeout, tblock);
1449
1450 if (inblock.sock < 0)
1451 {
1452 set_errno(addrlist, (errno == ETIMEDOUT)? ERRNO_CONNECTTIMEOUT : errno,
1453 NULL, DEFER, FALSE, NULL);
1454 return DEFER;
1455 }
1456
1457 #if defined(SUPPORT_TLS) && defined(EXPERIMENTAL_DANE)
1458 {
1459 tls_out.dane_verified = FALSE;
1460 tls_out.tlsa_usage = 0;
1461
1462 dane_required = verify_check_given_host(&ob->hosts_require_dane, host) == OK;
1463
1464 if (host->dnssec == DS_YES)
1465 {
1466 if( ( dane_required
1467 || verify_check_given_host(&ob->hosts_try_dane, host) == OK
1468 )
1469 && (rc = tlsa_lookup(host, &tlsa_dnsa, dane_required, &dane)) != OK
1470 )
1471 return rc;
1472 }
1473 else if (dane_required)
1474 {
1475 log_write(0, LOG_MAIN, "DANE error: %s lookup not DNSSEC", host->name);
1476 return FAIL;
1477 }
1478
1479 if (dane)
1480 ob->tls_tempfail_tryclear = FALSE;
1481 }
1482 #endif /*DANE*/
1483
1484 /* Expand the greeting message while waiting for the initial response. (Makes
1485 sense if helo_data contains ${lookup dnsdb ...} stuff). The expansion is
1486 delayed till here so that $sending_interface and $sending_port are set. */
1487
1488 helo_data = expand_string(ob->helo_data);
1489 #ifdef EXPERIMENTAL_INTERNATIONAL
1490 if (helo_data)
1491 {
1492 uschar * errstr = NULL;
1493 if ((helo_data = string_domain_utf8_to_alabel(helo_data, &errstr)), errstr)
1494 {
1495 errstr = string_sprintf("failed to expand helo_data: %s", errstr);
1496 set_errno(addrlist, ERRNO_EXPANDFAIL, errstr, DEFER, FALSE, NULL);
1497 yield = DEFER;
1498 goto SEND_QUIT;
1499 }
1500 }
1501 #endif
1502
1503 /* The first thing is to wait for an initial OK response. The dreaded "goto"
1504 is nevertheless a reasonably clean way of programming this kind of logic,
1505 where you want to escape on any error. */
1506
1507 if (!smtps)
1508 {
1509 if (!smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
1510 ob->command_timeout)) goto RESPONSE_FAILED;
1511
1512 #ifdef EXPERIMENTAL_EVENT
1513 {
1514 uschar * s;
1515 lookup_dnssec_authenticated = host->dnssec==DS_YES ? US"yes"
1516 : host->dnssec==DS_NO ? US"no" : NULL;
1517 s = event_raise(tblock->event_action, US"smtp:connect", buffer);
1518 if (s)
1519 {
1520 set_errno(addrlist, ERRNO_EXPANDFAIL,
1521 string_sprintf("deferred by smtp:connect event expansion: %s", s),
1522 DEFER, FALSE, NULL);
1523 yield = DEFER;
1524 goto SEND_QUIT;
1525 }
1526 }
1527 #endif
1528
1529 /* Now check if the helo_data expansion went well, and sign off cleanly if
1530 it didn't. */
1531
1532 if (helo_data == NULL)
1533 {
1534 uschar *message = string_sprintf("failed to expand helo_data: %s",
1535 expand_string_message);
1536 set_errno(addrlist, ERRNO_EXPANDFAIL, message, DEFER, FALSE, NULL);
1537 yield = DEFER;
1538 goto SEND_QUIT;
1539 }
1540 }
1541
1542 /** Debugging without sending a message
1543 addrlist->transport_return = DEFER;
1544 goto SEND_QUIT;
1545 **/
1546
1547 /* Errors that occur after this point follow an SMTP command, which is
1548 left in big_buffer by smtp_write_command() for use in error messages. */
1549
1550 smtp_command = big_buffer;
1551
1552 /* Tell the remote who we are...
1553
1554 February 1998: A convention has evolved that ESMTP-speaking MTAs include the
1555 string "ESMTP" in their greeting lines, so make Exim send EHLO if the
1556 greeting is of this form. The assumption was that the far end supports it
1557 properly... but experience shows that there are some that give 5xx responses,
1558 even though the banner includes "ESMTP" (there's a bloody-minded one that
1559 says "ESMTP not spoken here"). Cope with that case.
1560
1561 September 2000: Time has passed, and it seems reasonable now to always send
1562 EHLO at the start. It is also convenient to make the change while installing
1563 the TLS stuff.
1564
1565 July 2003: Joachim Wieland met a broken server that advertises "PIPELINING"
1566 but times out after sending MAIL FROM, RCPT TO and DATA all together. There
1567 would be no way to send out the mails, so there is now a host list
1568 "hosts_avoid_esmtp" that disables ESMTP for special hosts and solves the
1569 PIPELINING problem as well. Maybe it can also be useful to cure other
1570 problems with broken servers.
1571
1572 Exim originally sent "Helo" at this point and ran for nearly a year that way.
1573 Then somebody tried it with a Microsoft mailer... It seems that all other
1574 mailers use upper case for some reason (the RFC is quite clear about case
1575 independence) so, for peace of mind, I gave in. */
1576
1577 esmtp = verify_check_given_host(&ob->hosts_avoid_esmtp, host) != OK;
1578
1579 /* Alas; be careful, since this goto is not an error-out, so conceivably
1580 we might set data between here and the target which we assume to exist
1581 and be usable. I can see this coming back to bite us. */
1582 #ifdef SUPPORT_TLS
1583 if (smtps)
1584 {
1585 tls_offered = TRUE;
1586 suppress_tls = FALSE;
1587 ob->tls_tempfail_tryclear = FALSE;
1588 smtp_command = US"SSL-on-connect";
1589 goto TLS_NEGOTIATE;
1590 }
1591 #endif
1592
1593 if (esmtp)
1594 {
1595 if (smtp_write_command(&outblock, FALSE, "%s %s\r\n",
1596 lmtp? "LHLO" : "EHLO", helo_data) < 0)
1597 goto SEND_FAILED;
1598 if (!smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
1599 ob->command_timeout))
1600 {
1601 if (errno != 0 || buffer[0] == 0 || lmtp) goto RESPONSE_FAILED;
1602 esmtp = FALSE;
1603 }
1604 }
1605 else
1606 {
1607 DEBUG(D_transport)
1608 debug_printf("not sending EHLO (host matches hosts_avoid_esmtp)\n");
1609 }
1610
1611 if (!esmtp)
1612 {
1613 if (smtp_write_command(&outblock, FALSE, "HELO %s\r\n", helo_data) < 0)
1614 goto SEND_FAILED;
1615 if (!smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
1616 ob->command_timeout)) goto RESPONSE_FAILED;
1617 }
1618
1619 /* Set IGNOREQUOTA if the response to LHLO specifies support and the
1620 lmtp_ignore_quota option was set. */
1621
1622 igquotstr = (lmtp && ob->lmtp_ignore_quota &&
1623 pcre_exec(regex_IGNOREQUOTA, NULL, CS buffer, Ustrlen(CS buffer), 0,
1624 PCRE_EOPT, NULL, 0) >= 0)? US" IGNOREQUOTA" : US"";
1625
1626 /* Set tls_offered if the response to EHLO specifies support for STARTTLS. */
1627
1628 #ifdef SUPPORT_TLS
1629 tls_offered = esmtp &&
1630 pcre_exec(regex_STARTTLS, NULL, CS buffer, Ustrlen(buffer), 0,
1631 PCRE_EOPT, NULL, 0) >= 0;
1632 #endif
1633
1634 #ifndef DISABLE_PRDR
1635 prdr_offered = esmtp
1636 && pcre_exec(regex_PRDR, NULL, CS buffer, Ustrlen(buffer), 0,
1637 PCRE_EOPT, NULL, 0) >= 0
1638 && verify_check_given_host(&ob->hosts_try_prdr, host) == OK;
1639
1640 if (prdr_offered)
1641 {DEBUG(D_transport) debug_printf("PRDR usable\n");}
1642 #endif
1643
1644 #ifdef EXPERIMENTAL_INTERNATIONAL
1645 if (addrlist->prop.utf8_msg)
1646 {
1647 utf8_needed = !addrlist->prop.utf8_downcvt
1648 && !addrlist->prop.utf8_downcvt_maybe;
1649 DEBUG(D_transport) if (!utf8_needed) debug_printf("utf8: %s downconvert\n",
1650 addrlist->prop.utf8_downcvt ? "mandatory" : "optional");
1651
1652 utf8_offered = esmtp
1653 && pcre_exec(regex_UTF8, NULL, CS buffer, Ustrlen(buffer), 0,
1654 PCRE_EOPT, NULL, 0) >= 0;
1655 }
1656 #endif
1657 }
1658
1659 /* For continuing deliveries down the same channel, the socket is the standard
1660 input, and we don't need to redo EHLO here (but may need to do so for TLS - see
1661 below). Set up the pointer to where subsequent commands will be left, for
1662 error messages. Note that smtp_use_size and smtp_use_pipelining will have been
1663 set from the command line if they were set in the process that passed the
1664 connection on. */
1665
1666 else
1667 {
1668 inblock.sock = outblock.sock = fileno(stdin);
1669 smtp_command = big_buffer;
1670 host->port = port; /* Record the port that was used */
1671 }
1672
1673 /* If TLS is available on this connection, whether continued or not, attempt to
1674 start up a TLS session, unless the host is in hosts_avoid_tls. If successful,
1675 send another EHLO - the server may give a different answer in secure mode. We
1676 use a separate buffer for reading the response to STARTTLS so that if it is
1677 negative, the original EHLO data is available for subsequent analysis, should
1678 the client not be required to use TLS. If the response is bad, copy the buffer
1679 for error analysis. */
1680
1681 #ifdef SUPPORT_TLS
1682 if ( tls_offered
1683 && !suppress_tls
1684 && verify_check_given_host(&ob->hosts_avoid_tls, host) != OK)
1685 {
1686 uschar buffer2[4096];
1687 if (smtp_write_command(&outblock, FALSE, "STARTTLS\r\n") < 0)
1688 goto SEND_FAILED;
1689
1690 /* If there is an I/O error, transmission of this message is deferred. If
1691 there is a temporary rejection of STARRTLS and tls_tempfail_tryclear is
1692 false, we also defer. However, if there is a temporary rejection of STARTTLS
1693 and tls_tempfail_tryclear is true, or if there is an outright rejection of
1694 STARTTLS, we carry on. This means we will try to send the message in clear,
1695 unless the host is in hosts_require_tls (tested below). */
1696
1697 if (!smtp_read_response(&inblock, buffer2, sizeof(buffer2), '2',
1698 ob->command_timeout))
1699 {
1700 if (errno != 0 || buffer2[0] == 0 ||
1701 (buffer2[0] == '4' && !ob->tls_tempfail_tryclear))
1702 {
1703 Ustrncpy(buffer, buffer2, sizeof(buffer));
1704 goto RESPONSE_FAILED;
1705 }
1706 }
1707
1708 /* STARTTLS accepted: try to negotiate a TLS session. */
1709
1710 else
1711 TLS_NEGOTIATE:
1712 {
1713 int rc = tls_client_start(inblock.sock, host, addrlist, tblock
1714 # ifdef EXPERIMENTAL_DANE
1715 , dane ? &tlsa_dnsa : NULL
1716 # endif
1717 );
1718
1719 /* TLS negotiation failed; give an error. From outside, this function may
1720 be called again to try in clear on a new connection, if the options permit
1721 it for this host. */
1722
1723 if (rc != OK)
1724 {
1725 # ifdef EXPERIMENTAL_DANE
1726 if (rc == DEFER && dane && !dane_required)
1727 {
1728 log_write(0, LOG_MAIN, "DANE attempt failed;"
1729 " trying CA-root TLS to %s [%s] (not in hosts_require_dane)",
1730 host->name, host->address);
1731 dane = FALSE;
1732 goto TLS_NEGOTIATE;
1733 }
1734 # endif
1735
1736 save_errno = ERRNO_TLSFAILURE;
1737 message = US"failure while setting up TLS session";
1738 send_quit = FALSE;
1739 goto TLS_FAILED;
1740 }
1741
1742 /* TLS session is set up */
1743
1744 for (addr = addrlist; addr != NULL; addr = addr->next)
1745 if (addr->transport_return == PENDING_DEFER)
1746 {
1747 addr->cipher = tls_out.cipher;
1748 addr->ourcert = tls_out.ourcert;
1749 addr->peercert = tls_out.peercert;
1750 addr->peerdn = tls_out.peerdn;
1751 addr->ocsp = tls_out.ocsp;
1752 }
1753 }
1754 }
1755
1756 /* if smtps, we'll have smtp_command set to something else; always safe to
1757 reset it here. */
1758 smtp_command = big_buffer;
1759
1760 /* If we started TLS, redo the EHLO/LHLO exchange over the secure channel. If
1761 helo_data is null, we are dealing with a connection that was passed from
1762 another process, and so we won't have expanded helo_data above. We have to
1763 expand it here. $sending_ip_address and $sending_port are set up right at the
1764 start of the Exim process (in exim.c). */
1765
1766 if (tls_out.active >= 0)
1767 {
1768 char *greeting_cmd;
1769 if (helo_data == NULL)
1770 {
1771 helo_data = expand_string(ob->helo_data);
1772 if (helo_data == NULL)
1773 {
1774 uschar *message = string_sprintf("failed to expand helo_data: %s",
1775 expand_string_message);
1776 set_errno(addrlist, ERRNO_EXPANDFAIL, message, DEFER, FALSE, NULL);
1777 yield = DEFER;
1778 goto SEND_QUIT;
1779 }
1780 }
1781
1782 /* For SMTPS we need to wait for the initial OK response. */
1783 if (smtps)
1784 {
1785 if (!smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
1786 ob->command_timeout)) goto RESPONSE_FAILED;
1787 }
1788
1789 if (esmtp)
1790 greeting_cmd = "EHLO";
1791 else
1792 {
1793 greeting_cmd = "HELO";
1794 DEBUG(D_transport)
1795 debug_printf("not sending EHLO (host matches hosts_avoid_esmtp)\n");
1796 }
1797
1798 if (smtp_write_command(&outblock, FALSE, "%s %s\r\n",
1799 lmtp? "LHLO" : greeting_cmd, helo_data) < 0)
1800 goto SEND_FAILED;
1801 if (!smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
1802 ob->command_timeout))
1803 goto RESPONSE_FAILED;
1804 }
1805
1806 /* If the host is required to use a secure channel, ensure that we
1807 have one. */
1808
1809 else if (
1810 # ifdef EXPERIMENTAL_DANE
1811 dane ||
1812 # endif
1813 verify_check_given_host(&ob->hosts_require_tls, host) == OK
1814 )
1815 {
1816 save_errno = ERRNO_TLSREQUIRED;
1817 message = string_sprintf("a TLS session is required, but %s",
1818 tls_offered? "an attempt to start TLS failed" :
1819 "the server did not offer TLS support");
1820 goto TLS_FAILED;
1821 }
1822 #endif /*SUPPORT_TLS*/
1823
1824 /* If TLS is active, we have just started it up and re-done the EHLO command,
1825 so its response needs to be analyzed. If TLS is not active and this is a
1826 continued session down a previously-used socket, we haven't just done EHLO, so
1827 we skip this. */
1828
1829 if (continue_hostname == NULL
1830 #ifdef SUPPORT_TLS
1831 || tls_out.active >= 0
1832 #endif
1833 )
1834 {
1835 /* Set for IGNOREQUOTA if the response to LHLO specifies support and the
1836 lmtp_ignore_quota option was set. */
1837
1838 igquotstr = (lmtp && ob->lmtp_ignore_quota &&
1839 pcre_exec(regex_IGNOREQUOTA, NULL, CS buffer, Ustrlen(CS buffer), 0,
1840 PCRE_EOPT, NULL, 0) >= 0)? US" IGNOREQUOTA" : US"";
1841
1842 /* If the response to EHLO specified support for the SIZE parameter, note
1843 this, provided size_addition is non-negative. */
1844
1845 smtp_use_size = esmtp && ob->size_addition >= 0 &&
1846 pcre_exec(regex_SIZE, NULL, CS buffer, Ustrlen(CS buffer), 0,
1847 PCRE_EOPT, NULL, 0) >= 0;
1848
1849 /* Note whether the server supports PIPELINING. If hosts_avoid_esmtp matched
1850 the current host, esmtp will be false, so PIPELINING can never be used. If
1851 the current host matches hosts_avoid_pipelining, don't do it. */
1852
1853 smtp_use_pipelining = esmtp
1854 && verify_check_given_host(&ob->hosts_avoid_pipelining, host) != OK
1855 && pcre_exec(regex_PIPELINING, NULL, CS buffer, Ustrlen(CS buffer), 0,
1856 PCRE_EOPT, NULL, 0) >= 0;
1857
1858 DEBUG(D_transport) debug_printf("%susing PIPELINING\n",
1859 smtp_use_pipelining? "" : "not ");
1860
1861 #ifndef DISABLE_PRDR
1862 prdr_offered = esmtp
1863 && pcre_exec(regex_PRDR, NULL, CS buffer, Ustrlen(CS buffer), 0,
1864 PCRE_EOPT, NULL, 0) >= 0
1865 && verify_check_given_host(&ob->hosts_try_prdr, host) == OK;
1866
1867 if (prdr_offered)
1868 {DEBUG(D_transport) debug_printf("PRDR usable\n");}
1869 #endif
1870
1871 #ifdef EXPERIMENTAL_INTERNATIONAL
1872 if (addrlist->prop.utf8_msg)
1873 utf8_offered = esmtp
1874 && pcre_exec(regex_UTF8, NULL, CS buffer, Ustrlen(buffer), 0,
1875 PCRE_EOPT, NULL, 0) >= 0;
1876 #endif
1877
1878 /* Note if the server supports DSN */
1879 smtp_use_dsn = esmtp
1880 && pcre_exec(regex_DSN, NULL, CS buffer, Ustrlen(CS buffer), 0,
1881 PCRE_EOPT, NULL, 0) >= 0;
1882 DEBUG(D_transport) debug_printf("use_dsn=%d\n", smtp_use_dsn);
1883
1884 /* Note if the response to EHLO specifies support for the AUTH extension.
1885 If it has, check that this host is one we want to authenticate to, and do
1886 the business. The host name and address must be available when the
1887 authenticator's client driver is running. */
1888
1889 switch (yield = smtp_auth(buffer, sizeof(buffer), addrlist, host,
1890 ob, esmtp, &inblock, &outblock))
1891 {
1892 default: goto SEND_QUIT;
1893 case OK: break;
1894 case FAIL_SEND: goto SEND_FAILED;
1895 case FAIL: goto RESPONSE_FAILED;
1896 }
1897 }
1898
1899 /* The setting up of the SMTP call is now complete. Any subsequent errors are
1900 message-specific. */
1901
1902 setting_up = FALSE;
1903
1904 #ifdef EXPERIMENTAL_INTERNATIONAL
1905 /* If this is an international message we need the host to speak SMTPUTF8 */
1906 if (utf8_needed && !utf8_offered)
1907 {
1908 errno = ERRNO_UTF8_FWD;
1909 goto RESPONSE_FAILED;
1910 }
1911 #endif
1912
1913 /* If there is a filter command specified for this transport, we can now
1914 set it up. This cannot be done until the identify of the host is known. */
1915
1916 if (tblock->filter_command != NULL)
1917 {
1918 BOOL rc;
1919 uschar buffer[64];
1920 sprintf(CS buffer, "%.50s transport", tblock->name);
1921 rc = transport_set_up_command(&transport_filter_argv, tblock->filter_command,
1922 TRUE, DEFER, addrlist, buffer, NULL);
1923 transport_filter_timeout = tblock->filter_timeout;
1924
1925 /* On failure, copy the error to all addresses, abandon the SMTP call, and
1926 yield ERROR. */
1927
1928 if (!rc)
1929 {
1930 set_errno(addrlist->next, addrlist->basic_errno, addrlist->message, DEFER,
1931 FALSE, NULL);
1932 yield = ERROR;
1933 goto SEND_QUIT;
1934 }
1935 }
1936
1937
1938 /* For messages that have more than the maximum number of envelope recipients,
1939 we want to send several transactions down the same SMTP connection. (See
1940 comments in deliver.c as to how this reconciles, heuristically, with
1941 remote_max_parallel.) This optimization was added to Exim after the following
1942 code was already working. The simplest way to put it in without disturbing the
1943 code was to use a goto to jump back to this point when there is another
1944 transaction to handle. */
1945
1946 SEND_MESSAGE:
1947 sync_addr = first_addr;
1948 address_count = 0;
1949 ok = FALSE;
1950 send_rset = TRUE;
1951 completed_address = FALSE;
1952
1953
1954 /* Initiate a message transfer. If we know the receiving MTA supports the SIZE
1955 qualification, send it, adding something to the message size to allow for
1956 imprecision and things that get added en route. Exim keeps the number of lines
1957 in a message, so we can give an accurate value for the original message, but we
1958 need some additional to handle added headers. (Double "." characters don't get
1959 included in the count.) */
1960
1961 p = buffer;
1962 *p = 0;
1963
1964 if (smtp_use_size)
1965 {
1966 sprintf(CS p, " SIZE=%d", message_size+message_linecount+ob->size_addition);
1967 while (*p) p++;
1968 }
1969
1970 #ifndef DISABLE_PRDR
1971 prdr_active = FALSE;
1972 if (prdr_offered)
1973 {
1974 for (addr = first_addr; addr; addr = addr->next)
1975 if (addr->transport_return == PENDING_DEFER)
1976 {
1977 for (addr = addr->next; addr; addr = addr->next)
1978 if (addr->transport_return == PENDING_DEFER)
1979 { /* at least two recipients to send */
1980 prdr_active = TRUE;
1981 sprintf(CS p, " PRDR"); p += 5;
1982 break;
1983 }
1984 break;
1985 }
1986 }
1987 #endif
1988
1989 #ifdef EXPERIMENTAL_INTERNATIONAL
1990 if (addrlist->prop.utf8_msg && !addrlist->prop.utf8_downcvt && utf8_offered)
1991 sprintf(CS p, " SMTPUTF8"), p += 9;
1992 #endif
1993
1994 /* check if all addresses have lasthop flag */
1995 /* do not send RET and ENVID if true */
1996 for (dsn_all_lasthop = TRUE, addr = first_addr;
1997 address_count < max_rcpt && addr != NULL;
1998 addr = addr->next)
1999 if ((addr->dsn_flags & rf_dsnlasthop) != 1)
2000 {
2001 dsn_all_lasthop = FALSE;
2002 break;
2003 }
2004
2005 /* Add any DSN flags to the mail command */
2006
2007 if (smtp_use_dsn && !dsn_all_lasthop)
2008 {
2009 if (dsn_ret == dsn_ret_hdrs)
2010 {
2011 Ustrcpy(p, " RET=HDRS");
2012 while (*p) p++;
2013 }
2014 else if (dsn_ret == dsn_ret_full)
2015 {
2016 Ustrcpy(p, " RET=FULL");
2017 while (*p) p++;
2018 }
2019 if (dsn_envid != NULL)
2020 {
2021 string_format(p, sizeof(buffer) - (p-buffer), " ENVID=%s", dsn_envid);
2022 while (*p) p++;
2023 }
2024 }
2025
2026 /* If an authenticated_sender override has been specified for this transport
2027 instance, expand it. If the expansion is forced to fail, and there was already
2028 an authenticated_sender for this message, the original value will be used.
2029 Other expansion failures are serious. An empty result is ignored, but there is
2030 otherwise no check - this feature is expected to be used with LMTP and other
2031 cases where non-standard addresses (e.g. without domains) might be required. */
2032
2033 if (smtp_mail_auth_str(p, sizeof(buffer) - (p-buffer), addrlist, ob))
2034 {
2035 yield = ERROR;
2036 goto SEND_QUIT;
2037 }
2038
2039 /* From here until we send the DATA command, we can make use of PIPELINING
2040 if the server host supports it. The code has to be able to check the responses
2041 at any point, for when the buffer fills up, so we write it totally generally.
2042 When PIPELINING is off, each command written reports that it has flushed the
2043 buffer. */
2044
2045 pending_MAIL = TRUE; /* The block starts with MAIL */
2046
2047 {
2048 uschar * s = return_path;
2049 #ifdef EXPERIMENTAL_INTERNATIONAL
2050 uschar * errstr = NULL;
2051
2052 /* If we must downconvert, do the from-address here. Remember we had to
2053 for the to-addresses (done below), and also (ugly) for re-doing when building
2054 the delivery log line. */
2055
2056 if (addrlist->prop.utf8_msg && (addrlist->prop.utf8_downcvt || !utf8_offered))
2057 {
2058 if (s = string_address_utf8_to_alabel(return_path, &errstr), errstr)
2059 {
2060 set_errno(addrlist, ERRNO_EXPANDFAIL, errstr, DEFER, FALSE, NULL);
2061 yield = ERROR;
2062 goto SEND_QUIT;
2063 }
2064 setflag(addrlist, af_utf8_downcvt);
2065 }
2066 #endif
2067
2068 rc = smtp_write_command(&outblock, smtp_use_pipelining,
2069 "MAIL FROM:<%s>%s\r\n", s, buffer);
2070 }
2071
2072 mail_command = string_copy(big_buffer); /* Save for later error message */
2073
2074 switch(rc)
2075 {
2076 case -1: /* Transmission error */
2077 goto SEND_FAILED;
2078
2079 case +1: /* Block was sent */
2080 if (!smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
2081 ob->command_timeout))
2082 {
2083 if (errno == 0 && buffer[0] == '4')
2084 {
2085 errno = ERRNO_MAIL4XX;
2086 addrlist->more_errno |= ((buffer[1] - '0')*10 + buffer[2] - '0') << 8;
2087 }
2088 goto RESPONSE_FAILED;
2089 }
2090 pending_MAIL = FALSE;
2091 break;
2092 }
2093
2094 /* Pass over all the relevant recipient addresses for this host, which are the
2095 ones that have status PENDING_DEFER. If we are using PIPELINING, we can send
2096 several before we have to read the responses for those seen so far. This
2097 checking is done by a subroutine because it also needs to be done at the end.
2098 Send only up to max_rcpt addresses at a time, leaving first_addr pointing to
2099 the next one if not all are sent.
2100
2101 In the MUA wrapper situation, we want to flush the PIPELINING buffer for the
2102 last address because we want to abort if any recipients have any kind of
2103 problem, temporary or permanent. We know that all recipient addresses will have
2104 the PENDING_DEFER status, because only one attempt is ever made, and we know
2105 that max_rcpt will be large, so all addresses will be done at once. */
2106
2107 for (addr = first_addr;
2108 address_count < max_rcpt && addr != NULL;
2109 addr = addr->next)
2110 {
2111 int count;
2112 BOOL no_flush;
2113 uschar * rcpt_addr;
2114
2115 addr->dsn_aware = smtp_use_dsn ? dsn_support_yes : dsn_support_no;
2116
2117 if (addr->transport_return != PENDING_DEFER) continue;
2118
2119 address_count++;
2120 no_flush = smtp_use_pipelining && (!mua_wrapper || addr->next != NULL);
2121
2122 /* Add any DSN flags to the rcpt command and add to the sent string */
2123
2124 p = buffer;
2125 *p = 0;
2126
2127 if (smtp_use_dsn && (addr->dsn_flags & rf_dsnlasthop) != 1)
2128 {
2129 if ((addr->dsn_flags & rf_dsnflags) != 0)
2130 {
2131 int i;
2132 BOOL first = TRUE;
2133 Ustrcpy(p, " NOTIFY=");
2134 while (*p) p++;
2135 for (i = 0; i < 4; i++)
2136 if ((addr->dsn_flags & rf_list[i]) != 0)
2137 {
2138 if (!first) *p++ = ',';
2139 first = FALSE;
2140 Ustrcpy(p, rf_names[i]);
2141 while (*p) p++;
2142 }
2143 }
2144
2145 if (addr->dsn_orcpt != NULL)
2146 {
2147 string_format(p, sizeof(buffer) - (p-buffer), " ORCPT=%s",
2148 addr->dsn_orcpt);
2149 while (*p) p++;
2150 }
2151 }
2152
2153 /* Now send the RCPT command, and process outstanding responses when
2154 necessary. After a timeout on RCPT, we just end the function, leaving the
2155 yield as OK, because this error can often mean that there is a problem with
2156 just one address, so we don't want to delay the host. */
2157
2158 rcpt_addr = transport_rcpt_address(addr, tblock->rcpt_include_affixes);
2159
2160 #ifdef EXPERIMENTAL_INTERNATIONAL
2161 {
2162 uschar * dummy_errstr;
2163 if ( testflag(addrlist, af_utf8_downcvt)
2164 && (rcpt_addr = string_address_utf8_to_alabel(rcpt_addr, &dummy_errstr),
2165 dummy_errstr
2166 ) )
2167 {
2168 errno = ERRNO_EXPANDFAIL;
2169 goto SEND_FAILED;
2170 }
2171 }
2172 #endif
2173
2174 count = smtp_write_command(&outblock, no_flush, "RCPT TO:<%s>%s%s\r\n",
2175 rcpt_addr, igquotstr, buffer);
2176
2177 if (count < 0) goto SEND_FAILED;
2178 if (count > 0)
2179 {
2180 switch(sync_responses(first_addr, tblock->rcpt_include_affixes,
2181 &sync_addr, host, count, ob->address_retry_include_sender,
2182 pending_MAIL, 0, &inblock, ob->command_timeout, buffer,
2183 sizeof(buffer)))
2184 {
2185 case 3: ok = TRUE; /* 2xx & 5xx => OK & progress made */
2186 case 2: completed_address = TRUE; /* 5xx (only) => progress made */
2187 break;
2188
2189 case 1: ok = TRUE; /* 2xx (only) => OK, but if LMTP, */
2190 if (!lmtp) completed_address = TRUE; /* can't tell about progress yet */
2191 case 0: /* No 2xx or 5xx, but no probs */
2192 break;
2193
2194 case -1: goto END_OFF; /* Timeout on RCPT */
2195 default: goto RESPONSE_FAILED; /* I/O error, or any MAIL error */
2196 }
2197 pending_MAIL = FALSE; /* Dealt with MAIL */
2198 }
2199 } /* Loop for next address */
2200
2201 /* If we are an MUA wrapper, abort if any RCPTs were rejected, either
2202 permanently or temporarily. We should have flushed and synced after the last
2203 RCPT. */
2204
2205 if (mua_wrapper)
2206 {
2207 address_item *badaddr;
2208 for (badaddr = first_addr; badaddr; badaddr = badaddr->next)
2209 if (badaddr->transport_return != PENDING_OK)
2210 {
2211 /*XXX could we find a better errno than 0 here? */
2212 set_errno(addrlist, 0, badaddr->message, FAIL,
2213 testflag(badaddr, af_pass_message), NULL);
2214 ok = FALSE;
2215 break;
2216 }
2217 }
2218
2219 /* If ok is TRUE, we know we have got at least one good recipient, and must now
2220 send DATA, but if it is FALSE (in the normal, non-wrapper case), we may still
2221 have a good recipient buffered up if we are pipelining. We don't want to waste
2222 time sending DATA needlessly, so we only send it if either ok is TRUE or if we
2223 are pipelining. The responses are all handled by sync_responses(). */
2224
2225 if (ok || (smtp_use_pipelining && !mua_wrapper))
2226 {
2227 int count = smtp_write_command(&outblock, FALSE, "DATA\r\n");
2228 if (count < 0) goto SEND_FAILED;
2229 switch(sync_responses(first_addr, tblock->rcpt_include_affixes, &sync_addr,
2230 host, count, ob->address_retry_include_sender, pending_MAIL,
2231 ok? +1 : -1, &inblock, ob->command_timeout, buffer, sizeof(buffer)))
2232 {
2233 case 3: ok = TRUE; /* 2xx & 5xx => OK & progress made */
2234 case 2: completed_address = TRUE; /* 5xx (only) => progress made */
2235 break;
2236
2237 case 1: ok = TRUE; /* 2xx (only) => OK, but if LMTP, */
2238 if (!lmtp) completed_address = TRUE; /* can't tell about progress yet */
2239 case 0: break; /* No 2xx or 5xx, but no probs */
2240
2241 case -1: goto END_OFF; /* Timeout on RCPT */
2242 default: goto RESPONSE_FAILED; /* I/O error, or any MAIL/DATA error */
2243 }
2244 }
2245
2246 /* Save the first address of the next batch. */
2247
2248 first_addr = addr;
2249
2250 /* If there were no good recipients (but otherwise there have been no
2251 problems), just set ok TRUE, since we have handled address-specific errors
2252 already. Otherwise, it's OK to send the message. Use the check/escape mechanism
2253 for handling the SMTP dot-handling protocol, flagging to apply to headers as
2254 well as body. Set the appropriate timeout value to be used for each chunk.
2255 (Haven't been able to make it work using select() for writing yet.) */
2256
2257 if (!ok) ok = TRUE; else
2258 {
2259 sigalrm_seen = FALSE;
2260 transport_write_timeout = ob->data_timeout;
2261 smtp_command = US"sending data block"; /* For error messages */
2262 DEBUG(D_transport|D_v)
2263 debug_printf(" SMTP>> writing message and terminating \".\"\n");
2264 transport_count = 0;
2265
2266 #ifndef DISABLE_DKIM
2267 ok = dkim_transport_write_message(addrlist, inblock.sock,
2268 topt_use_crlf | topt_end_dot | topt_escape_headers |
2269 (tblock->body_only? topt_no_headers : 0) |
2270 (tblock->headers_only? topt_no_body : 0) |
2271 (tblock->return_path_add? topt_add_return_path : 0) |
2272 (tblock->delivery_date_add? topt_add_delivery_date : 0) |
2273 (tblock->envelope_to_add? topt_add_envelope_to : 0),
2274 0, /* No size limit */
2275 tblock->add_headers, tblock->remove_headers,
2276 US".", US"..", /* Escaping strings */
2277 tblock->rewrite_rules, tblock->rewrite_existflags,
2278 ob->dkim_private_key, ob->dkim_domain, ob->dkim_selector,
2279 ob->dkim_canon, ob->dkim_strict, ob->dkim_sign_headers
2280 );
2281 #else
2282 ok = transport_write_message(addrlist, inblock.sock,
2283 topt_use_crlf | topt_end_dot | topt_escape_headers |
2284 (tblock->body_only? topt_no_headers : 0) |
2285 (tblock->headers_only? topt_no_body : 0) |
2286 (tblock->return_path_add? topt_add_return_path : 0) |
2287 (tblock->delivery_date_add? topt_add_delivery_date : 0) |
2288 (tblock->envelope_to_add? topt_add_envelope_to : 0),
2289 0, /* No size limit */
2290 tblock->add_headers, tblock->remove_headers,
2291 US".", US"..", /* Escaping strings */
2292 tblock->rewrite_rules, tblock->rewrite_existflags);
2293 #endif
2294
2295 /* transport_write_message() uses write() because it is called from other
2296 places to write to non-sockets. This means that under some OS (e.g. Solaris)
2297 it can exit with "Broken pipe" as its error. This really means that the
2298 socket got closed at the far end. */
2299
2300 transport_write_timeout = 0; /* for subsequent transports */
2301
2302 /* Failure can either be some kind of I/O disaster (including timeout),
2303 or the failure of a transport filter or the expansion of added headers. */
2304
2305 if (!ok)
2306 {
2307 buffer[0] = 0; /* There hasn't been a response */
2308 goto RESPONSE_FAILED;
2309 }
2310
2311 /* We used to send the terminating "." explicitly here, but because of
2312 buffering effects at both ends of TCP/IP connections, you don't gain
2313 anything by keeping it separate, so it might as well go in the final
2314 data buffer for efficiency. This is now done by setting the topt_end_dot
2315 flag above. */
2316
2317 smtp_command = US"end of data";
2318
2319 #ifndef DISABLE_PRDR
2320 /* For PRDR we optionally get a partial-responses warning
2321 * followed by the individual responses, before going on with
2322 * the overall response. If we don't get the warning then deal
2323 * with per non-PRDR. */
2324 if(prdr_active)
2325 {
2326 ok = smtp_read_response(&inblock, buffer, sizeof(buffer), '3',
2327 ob->final_timeout);
2328 if (!ok && errno == 0)
2329 switch(buffer[0])
2330 {
2331 case '2': prdr_active = FALSE;
2332 ok = TRUE;
2333 break;
2334 case '4': errno = ERRNO_DATA4XX;
2335 addrlist->more_errno |= ((buffer[1] - '0')*10 + buffer[2] - '0') << 8;
2336 break;
2337 }
2338 }
2339 else
2340 #endif
2341
2342 /* For non-PRDR SMTP, we now read a single response that applies to the
2343 whole message. If it is OK, then all the addresses have been delivered. */
2344
2345 if (!lmtp)
2346 {
2347 ok = smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
2348 ob->final_timeout);
2349 if (!ok && errno == 0 && buffer[0] == '4')
2350 {
2351 errno = ERRNO_DATA4XX;
2352 addrlist->more_errno |= ((buffer[1] - '0')*10 + buffer[2] - '0') << 8;
2353 }
2354 }
2355
2356 /* For LMTP, we get back a response for every RCPT command that we sent;
2357 some may be accepted and some rejected. For those that get a response, their
2358 status is fixed; any that are accepted have been handed over, even if later
2359 responses crash - at least, that's how I read RFC 2033.
2360
2361 If all went well, mark the recipient addresses as completed, record which
2362 host/IPaddress they were delivered to, and cut out RSET when sending another
2363 message down the same channel. Write the completed addresses to the journal
2364 now so that they are recorded in case there is a crash of hardware or
2365 software before the spool gets updated. Also record the final SMTP
2366 confirmation if needed (for SMTP only). */
2367
2368 if (ok)
2369 {
2370 int flag = '=';
2371 int delivery_time = (int)(time(NULL) - start_delivery_time);
2372 int len;
2373 uschar *conf = NULL;
2374 send_rset = FALSE;
2375
2376 /* Set up confirmation if needed - applies only to SMTP */
2377
2378 if (
2379 #ifndef EXPERIMENTAL_EVENT
2380 (log_extra_selector & LX_smtp_confirmation) != 0 &&
2381 #endif
2382 !lmtp
2383 )
2384 {
2385 const uschar *s = string_printing(buffer);
2386 /* deconst cast ok here as string_printing was checked to have alloc'n'copied */
2387 conf = (s == buffer)? (uschar *)string_copy(s) : US s;
2388 }
2389
2390 /* Process all transported addresses - for LMTP or PRDR, read a status for
2391 each one. */
2392
2393 for (addr = addrlist; addr != first_addr; addr = addr->next)
2394 {
2395 if (addr->transport_return != PENDING_OK) continue;
2396
2397 /* LMTP - if the response fails badly (e.g. timeout), use it for all the
2398 remaining addresses. Otherwise, it's a return code for just the one
2399 address. For temporary errors, add a retry item for the address so that
2400 it doesn't get tried again too soon. */
2401
2402 #ifndef DISABLE_PRDR
2403 if (lmtp || prdr_active)
2404 #else
2405 if (lmtp)
2406 #endif
2407 {
2408 if (!smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
2409 ob->final_timeout))
2410 {
2411 if (errno != 0 || buffer[0] == 0) goto RESPONSE_FAILED;
2412 addr->message = string_sprintf(
2413 #ifndef DISABLE_PRDR
2414 "%s error after %s: %s", prdr_active ? "PRDR":"LMTP",
2415 #else
2416 "LMTP error after %s: %s",
2417 #endif
2418 big_buffer, string_printing(buffer));
2419 setflag(addr, af_pass_message); /* Allow message to go to user */
2420 if (buffer[0] == '5')
2421 addr->transport_return = FAIL;
2422 else
2423 {
2424 errno = ERRNO_DATA4XX;
2425 addr->more_errno |= ((buffer[1] - '0')*10 + buffer[2] - '0') << 8;
2426 addr->transport_return = DEFER;
2427 #ifndef DISABLE_PRDR
2428 if (!prdr_active)
2429 #endif
2430 retry_add_item(addr, addr->address_retry_key, 0);
2431 }
2432 continue;
2433 }
2434 completed_address = TRUE; /* NOW we can set this flag */
2435 if ((log_extra_selector & LX_smtp_confirmation) != 0)
2436 {
2437 const uschar *s = string_printing(buffer);
2438 /* deconst cast ok here as string_printing was checked to have alloc'n'copied */
2439 conf = (s == buffer)? (uschar *)string_copy(s) : US s;
2440 }
2441 }
2442
2443 /* SMTP, or success return from LMTP for this address. Pass back the
2444 actual host that was used. */
2445
2446 addr->transport_return = OK;
2447 addr->more_errno = delivery_time;
2448 addr->host_used = host;
2449 addr->special_action = flag;
2450 addr->message = conf;
2451 #ifndef DISABLE_PRDR
2452 if (prdr_active) addr->flags |= af_prdr_used;
2453 #endif
2454 flag = '-';
2455
2456 #ifndef DISABLE_PRDR
2457 if (!prdr_active)
2458 #endif
2459 {
2460 /* Update the journal. For homonymic addresses, use the base address plus
2461 the transport name. See lots of comments in deliver.c about the reasons
2462 for the complications when homonyms are involved. Just carry on after
2463 write error, as it may prove possible to update the spool file later. */
2464
2465 if (testflag(addr, af_homonym))
2466 sprintf(CS buffer, "%.500s/%s\n", addr->unique + 3, tblock->name);
2467 else
2468 sprintf(CS buffer, "%.500s\n", addr->unique);
2469
2470 DEBUG(D_deliver) debug_printf("journalling %s", buffer);
2471 len = Ustrlen(CS buffer);
2472 if (write(journal_fd, buffer, len) != len)
2473 log_write(0, LOG_MAIN|LOG_PANIC, "failed to write journal for "
2474 "%s: %s", buffer, strerror(errno));
2475 }
2476 }
2477
2478 #ifndef DISABLE_PRDR
2479 if (prdr_active)
2480 {
2481 /* PRDR - get the final, overall response. For any non-success
2482 upgrade all the address statuses. */
2483 ok = smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
2484 ob->final_timeout);
2485 if (!ok)
2486 {
2487 if(errno == 0 && buffer[0] == '4')
2488 {
2489 errno = ERRNO_DATA4XX;
2490 addrlist->more_errno |= ((buffer[1] - '0')*10 + buffer[2] - '0') << 8;
2491 }
2492 for (addr = addrlist; addr != first_addr; addr = addr->next)
2493 if (buffer[0] == '5' || addr->transport_return == OK)
2494 addr->transport_return = PENDING_OK; /* allow set_errno action */
2495 goto RESPONSE_FAILED;
2496 }
2497
2498 /* Update the journal, or setup retry. */
2499 for (addr = addrlist; addr != first_addr; addr = addr->next)
2500 if (addr->transport_return == OK)
2501 {
2502 if (testflag(addr, af_homonym))
2503 sprintf(CS buffer, "%.500s/%s\n", addr->unique + 3, tblock->name);
2504 else
2505 sprintf(CS buffer, "%.500s\n", addr->unique);
2506
2507 DEBUG(D_deliver) debug_printf("journalling(PRDR) %s", buffer);
2508 len = Ustrlen(CS buffer);
2509 if (write(journal_fd, buffer, len) != len)
2510 log_write(0, LOG_MAIN|LOG_PANIC, "failed to write journal for "
2511 "%s: %s", buffer, strerror(errno));
2512 }
2513 else if (addr->transport_return == DEFER)
2514 retry_add_item(addr, addr->address_retry_key, -2);
2515 }
2516 #endif
2517
2518 /* Ensure the journal file is pushed out to disk. */
2519
2520 if (EXIMfsync(journal_fd) < 0)
2521 log_write(0, LOG_MAIN|LOG_PANIC, "failed to fsync journal: %s",
2522 strerror(errno));
2523 }
2524 }
2525
2526
2527 /* Handle general (not specific to one address) failures here. The value of ok
2528 is used to skip over this code on the falling through case. A timeout causes a
2529 deferral. Other errors may defer or fail according to the response code, and
2530 may set up a special errno value, e.g. after connection chopped, which is
2531 assumed if errno == 0 and there is no text in the buffer. If control reaches
2532 here during the setting up phase (i.e. before MAIL FROM) then always defer, as
2533 the problem is not related to this specific message. */
2534
2535 if (!ok)
2536 {
2537 int code;
2538
2539 RESPONSE_FAILED:
2540 save_errno = errno;
2541 message = NULL;
2542 send_quit = check_response(host, &save_errno, addrlist->more_errno,
2543 buffer, &code, &message, &pass_message);
2544 goto FAILED;
2545
2546 SEND_FAILED:
2547 save_errno = errno;
2548 code = '4';
2549 message = US string_sprintf("send() to %s [%s] failed: %s",
2550 host->name, host->address, strerror(save_errno));
2551 send_quit = FALSE;
2552 goto FAILED;
2553
2554 /* This label is jumped to directly when a TLS negotiation has failed,
2555 or was not done for a host for which it is required. Values will be set
2556 in message and save_errno, and setting_up will always be true. Treat as
2557 a temporary error. */
2558
2559 #ifdef SUPPORT_TLS
2560 TLS_FAILED:
2561 code = '4';
2562 #endif
2563
2564 /* If the failure happened while setting up the call, see if the failure was
2565 a 5xx response (this will either be on connection, or following HELO - a 5xx
2566 after EHLO causes it to try HELO). If so, fail all addresses, as this host is
2567 never going to accept them. For other errors during setting up (timeouts or
2568 whatever), defer all addresses, and yield DEFER, so that the host is not
2569 tried again for a while. */
2570
2571 FAILED:
2572 ok = FALSE; /* For when reached by GOTO */
2573
2574 if (setting_up)
2575 {
2576 if (code == '5')
2577 set_errno(addrlist, save_errno, message, FAIL, pass_message, host);
2578 else
2579 {
2580 set_errno(addrlist, save_errno, message, DEFER, pass_message, host);
2581 yield = DEFER;
2582 }
2583 }
2584
2585 /* We want to handle timeouts after MAIL or "." and loss of connection after
2586 "." specially. They can indicate a problem with the sender address or with
2587 the contents of the message rather than a real error on the connection. These
2588 cases are treated in the same way as a 4xx response. This next bit of code
2589 does the classification. */
2590
2591 else
2592 {
2593 BOOL message_error;
2594
2595 switch(save_errno)
2596 {
2597 #ifdef EXPERIMENTAL_INTERNATIONAL
2598 case ERRNO_UTF8_FWD:
2599 code = '5';
2600 /*FALLTHROUGH*/
2601 #endif
2602 case 0:
2603 case ERRNO_MAIL4XX:
2604 case ERRNO_DATA4XX:
2605 message_error = TRUE;
2606 break;
2607
2608 case ETIMEDOUT:
2609 message_error = Ustrncmp(smtp_command,"MAIL",4) == 0 ||
2610 Ustrncmp(smtp_command,"end ",4) == 0;
2611 break;
2612
2613 case ERRNO_SMTPCLOSED:
2614 message_error = Ustrncmp(smtp_command,"end ",4) == 0;
2615 break;
2616
2617 default:
2618 message_error = FALSE;
2619 break;
2620 }
2621
2622 /* Handle the cases that are treated as message errors. These are:
2623
2624 (a) negative response or timeout after MAIL
2625 (b) negative response after DATA
2626 (c) negative response or timeout or dropped connection after "."
2627 (d) utf8 support required and not offered
2628
2629 It won't be a negative response or timeout after RCPT, as that is dealt
2630 with separately above. The action in all cases is to set an appropriate
2631 error code for all the addresses, but to leave yield set to OK because the
2632 host itself has not failed. Of course, it might in practice have failed
2633 when we've had a timeout, but if so, we'll discover that at the next
2634 delivery attempt. For a temporary error, set the message_defer flag, and
2635 write to the logs for information if this is not the last host. The error
2636 for the last host will be logged as part of the address's log line. */
2637
2638 if (message_error)
2639 {
2640 if (mua_wrapper) code = '5'; /* Force hard failure in wrapper mode */
2641 set_errno(addrlist, save_errno, message, (code == '5')? FAIL : DEFER,
2642 pass_message, host);
2643
2644 /* If there's an errno, the message contains just the identity of
2645 the host. */
2646
2647 if (code != '5') /* Anything other than 5 is treated as temporary */
2648 {
2649 if (save_errno > 0)
2650 message = US string_sprintf("%s: %s", message, strerror(save_errno));
2651 if (host->next != NULL) log_write(0, LOG_MAIN, "%s", message);
2652 msglog_line(host, message);
2653 *message_defer = TRUE;
2654 }
2655 }
2656
2657 /* Otherwise, we have an I/O error or a timeout other than after MAIL or
2658 ".", or some other transportation error. We defer all addresses and yield
2659 DEFER, except for the case of failed add_headers expansion, or a transport
2660 filter failure, when the yield should be ERROR, to stop it trying other
2661 hosts. */
2662
2663 else
2664 {
2665 yield = (save_errno == ERRNO_CHHEADER_FAIL ||
2666 save_errno == ERRNO_FILTER_FAIL)? ERROR : DEFER;
2667 set_errno(addrlist, save_errno, message, DEFER, pass_message, host);
2668 }
2669 }
2670 }
2671
2672
2673 /* If all has gone well, send_quit will be set TRUE, implying we can end the
2674 SMTP session tidily. However, if there were too many addresses to send in one
2675 message (indicated by first_addr being non-NULL) we want to carry on with the
2676 rest of them. Also, it is desirable to send more than one message down the SMTP
2677 connection if there are several waiting, provided we haven't already sent so
2678 many as to hit the configured limit. The function transport_check_waiting looks
2679 for a waiting message and returns its id. Then transport_pass_socket tries to
2680 set up a continued delivery by passing the socket on to another process. The
2681 variable send_rset is FALSE if a message has just been successfully transfered.
2682
2683 If we are already sending down a continued channel, there may be further
2684 addresses not yet delivered that are aimed at the same host, but which have not
2685 been passed in this run of the transport. In this case, continue_more will be
2686 true, and all we should do is send RSET if necessary, and return, leaving the
2687 channel open.
2688
2689 However, if no address was disposed of, i.e. all addresses got 4xx errors, we
2690 do not want to continue with other messages down the same channel, because that
2691 can lead to looping between two or more messages, all with the same,
2692 temporarily failing address(es). [The retry information isn't updated yet, so
2693 new processes keep on trying.] We probably also don't want to try more of this
2694 message's addresses either.
2695
2696 If we have started a TLS session, we have to end it before passing the
2697 connection to a new process. However, not all servers can handle this (Exim
2698 can), so we do not pass such a connection on if the host matches
2699 hosts_nopass_tls. */
2700
2701 DEBUG(D_transport)
2702 debug_printf("ok=%d send_quit=%d send_rset=%d continue_more=%d "
2703 "yield=%d first_address is %sNULL\n", ok, send_quit, send_rset,
2704 continue_more, yield, (first_addr == NULL)? "":"not ");
2705
2706 if (completed_address && ok && send_quit)
2707 {
2708 BOOL more;
2709 smtp_compare_t t_compare;
2710
2711 t_compare.tblock = tblock;
2712 t_compare.current_sender_address = sender_address;
2713
2714 if ( first_addr != NULL
2715 || continue_more
2716 || ( ( tls_out.active < 0
2717 || verify_check_given_host(&ob->hosts_nopass_tls, host) != OK
2718 )
2719 &&
2720 transport_check_waiting(tblock->name, host->name,
2721 tblock->connection_max_messages, new_message_id, &more,
2722 (oicf)smtp_are_same_identities, (void*)&t_compare)
2723 ) )
2724 {
2725 uschar *msg;
2726 BOOL pass_message;
2727
2728 if (send_rset)
2729 {
2730 if (! (ok = smtp_write_command(&outblock, FALSE, "RSET\r\n") >= 0))
2731 {
2732 msg = US string_sprintf("send() to %s [%s] failed: %s", host->name,
2733 host->address, strerror(save_errno));
2734 send_quit = FALSE;
2735 }
2736 else if (! (ok = smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
2737 ob->command_timeout)))
2738 {
2739 int code;
2740 send_quit = check_response(host, &errno, 0, buffer, &code, &msg,
2741 &pass_message);
2742 if (!send_quit)
2743 {
2744 DEBUG(D_transport) debug_printf("H=%s [%s] %s\n",
2745 host->name, host->address, msg);
2746 }
2747 }
2748 }
2749
2750 /* Either RSET was not needed, or it succeeded */
2751
2752 if (ok)
2753 {
2754 if (first_addr != NULL) /* More addresses still to be sent */
2755 { /* in this run of the transport */
2756 continue_sequence++; /* Causes * in logging */
2757 goto SEND_MESSAGE;
2758 }
2759 if (continue_more) return yield; /* More addresses for another run */
2760
2761 /* Pass the socket to a new Exim process. Before doing so, we must shut
2762 down TLS. Not all MTAs allow for the continuation of the SMTP session
2763 when TLS is shut down. We test for this by sending a new EHLO. If we
2764 don't get a good response, we don't attempt to pass the socket on. */
2765
2766 #ifdef SUPPORT_TLS
2767 if (tls_out.active >= 0)
2768 {
2769 tls_close(FALSE, TRUE);
2770 if (smtps)
2771 ok = FALSE;
2772 else
2773 ok = smtp_write_command(&outblock,FALSE,"EHLO %s\r\n",helo_data) >= 0 &&
2774 smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
2775 ob->command_timeout);
2776 }
2777 #endif
2778
2779 /* If the socket is successfully passed, we musn't send QUIT (or
2780 indeed anything!) from here. */
2781
2782 if (ok && transport_pass_socket(tblock->name, host->name, host->address,
2783 new_message_id, inblock.sock))
2784 {
2785 send_quit = FALSE;
2786 }
2787 }
2788
2789 /* If RSET failed and there are addresses left, they get deferred. */
2790
2791 else set_errno(first_addr, errno, msg, DEFER, FALSE, host);
2792 }
2793 }
2794
2795 /* End off tidily with QUIT unless the connection has died or the socket has
2796 been passed to another process. There has been discussion on the net about what
2797 to do after sending QUIT. The wording of the RFC suggests that it is necessary
2798 to wait for a response, but on the other hand, there isn't anything one can do
2799 with an error response, other than log it. Exim used to do that. However,
2800 further discussion suggested that it is positively advantageous not to wait for
2801 the response, but to close the session immediately. This is supposed to move
2802 the TCP/IP TIME_WAIT state from the server to the client, thereby removing some
2803 load from the server. (Hosts that are both servers and clients may not see much
2804 difference, of course.) Further discussion indicated that this was safe to do
2805 on Unix systems which have decent implementations of TCP/IP that leave the
2806 connection around for a while (TIME_WAIT) after the application has gone away.
2807 This enables the response sent by the server to be properly ACKed rather than
2808 timed out, as can happen on broken TCP/IP implementations on other OS.
2809
2810 This change is being made on 31-Jul-98. After over a year of trouble-free
2811 operation, the old commented-out code was removed on 17-Sep-99. */
2812
2813 SEND_QUIT:
2814 if (send_quit) (void)smtp_write_command(&outblock, FALSE, "QUIT\r\n");
2815
2816 END_OFF:
2817
2818 #ifdef SUPPORT_TLS
2819 tls_close(FALSE, TRUE);
2820 #endif
2821
2822 /* Close the socket, and return the appropriate value, first setting
2823 works because the NULL setting is passed back to the calling process, and
2824 remote_max_parallel is forced to 1 when delivering over an existing connection,
2825
2826 If all went well and continue_more is set, we shouldn't actually get here if
2827 there are further addresses, as the return above will be taken. However,
2828 writing RSET might have failed, or there may be other addresses whose hosts are
2829 specified in the transports, and therefore not visible at top level, in which
2830 case continue_more won't get set. */
2831
2832 (void)close(inblock.sock);
2833
2834 #ifdef EXPERIMENTAL_EVENT
2835 (void) event_raise(tblock->event_action, US"tcp:close", NULL);
2836 #endif
2837
2838 continue_transport = NULL;
2839 continue_hostname = NULL;
2840 return yield;
2841 }
2842
2843
2844
2845
2846 /*************************************************
2847 * Closedown entry point *
2848 *************************************************/
2849
2850 /* This function is called when exim is passed an open smtp channel
2851 from another incarnation, but the message which it has been asked
2852 to deliver no longer exists. The channel is on stdin.
2853
2854 We might do fancy things like looking for another message to send down
2855 the channel, but if the one we sought has gone, it has probably been
2856 delivered by some other process that itself will seek further messages,
2857 so just close down our connection.
2858
2859 Argument: pointer to the transport instance block
2860 Returns: nothing
2861 */
2862
2863 void
2864 smtp_transport_closedown(transport_instance *tblock)
2865 {
2866 smtp_transport_options_block *ob =
2867 (smtp_transport_options_block *)(tblock->options_block);
2868 smtp_inblock inblock;
2869 smtp_outblock outblock;
2870 uschar buffer[256];
2871 uschar inbuffer[4096];
2872 uschar outbuffer[16];
2873
2874 inblock.sock = fileno(stdin);
2875 inblock.buffer = inbuffer;
2876 inblock.buffersize = sizeof(inbuffer);
2877 inblock.ptr = inbuffer;
2878 inblock.ptrend = inbuffer;
2879
2880 outblock.sock = inblock.sock;
2881 outblock.buffersize = sizeof(outbuffer);
2882 outblock.buffer = outbuffer;
2883 outblock.ptr = outbuffer;
2884 outblock.cmd_count = 0;
2885 outblock.authenticating = FALSE;
2886
2887 (void)smtp_write_command(&outblock, FALSE, "QUIT\r\n");
2888 (void)smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
2889 ob->command_timeout);
2890 (void)close(inblock.sock);
2891 }
2892
2893
2894
2895 /*************************************************
2896 * Prepare addresses for delivery *
2897 *************************************************/
2898
2899 /* This function is called to flush out error settings from previous delivery
2900 attempts to other hosts. It also records whether we got here via an MX record
2901 or not in the more_errno field of the address. We are interested only in
2902 addresses that are still marked DEFER - others may have got delivered to a
2903 previously considered IP address. Set their status to PENDING_DEFER to indicate
2904 which ones are relevant this time.
2905
2906 Arguments:
2907 addrlist the list of addresses
2908 host the host we are delivering to
2909
2910 Returns: the first address for this delivery
2911 */
2912
2913 static address_item *
2914 prepare_addresses(address_item *addrlist, host_item *host)
2915 {
2916 address_item *first_addr = NULL;
2917 address_item *addr;
2918 for (addr = addrlist; addr != NULL; addr = addr->next)
2919 if (addr->transport_return == DEFER)
2920 {
2921 if (first_addr == NULL) first_addr = addr;
2922 addr->transport_return = PENDING_DEFER;
2923 addr->basic_errno = 0;
2924 addr->more_errno = (host->mx >= 0)? 'M' : 'A';
2925 addr->message = NULL;
2926 #ifdef SUPPORT_TLS
2927 addr->cipher = NULL;
2928 addr->ourcert = NULL;
2929 addr->peercert = NULL;
2930 addr->peerdn = NULL;
2931 addr->ocsp = OCSP_NOT_REQ;
2932 #endif
2933 }
2934 return first_addr;
2935 }
2936
2937
2938
2939 /*************************************************
2940 * Main entry point *
2941 *************************************************/
2942
2943 /* See local README for interface details. As this is a remote transport, it is
2944 given a chain of addresses to be delivered in one connection, if possible. It
2945 always returns TRUE, indicating that each address has its own independent
2946 status set, except if there is a setting up problem, in which case it returns
2947 FALSE. */
2948
2949 BOOL
2950 smtp_transport_entry(
2951 transport_instance *tblock, /* data for this instantiation */
2952 address_item *addrlist) /* addresses we are working on */
2953 {
2954 int cutoff_retry;
2955 int port;
2956 int hosts_defer = 0;
2957 int hosts_fail = 0;
2958 int hosts_looked_up = 0;
2959 int hosts_retry = 0;
2960 int hosts_serial = 0;
2961 int hosts_total = 0;
2962 int total_hosts_tried = 0;
2963 address_item *addr;
2964 BOOL expired = TRUE;
2965 BOOL continuing = continue_hostname != NULL;
2966 uschar *expanded_hosts = NULL;
2967 uschar *pistring;
2968 uschar *tid = string_sprintf("%s transport", tblock->name);
2969 smtp_transport_options_block *ob =
2970 (smtp_transport_options_block *)(tblock->options_block);
2971 host_item *hostlist = addrlist->host_list;
2972 host_item *host = NULL;
2973
2974 DEBUG(D_transport)
2975 {
2976 debug_printf("%s transport entered\n", tblock->name);
2977 for (addr = addrlist; addr != NULL; addr = addr->next)
2978 debug_printf(" %s\n", addr->address);
2979 if (continuing) debug_printf("already connected to %s [%s]\n",
2980 continue_hostname, continue_host_address);
2981 }
2982
2983 /* Set the flag requesting that these hosts be added to the waiting
2984 database if the delivery fails temporarily or if we are running with
2985 queue_smtp or a 2-stage queue run. This gets unset for certain
2986 kinds of error, typically those that are specific to the message. */
2987
2988 update_waiting = TRUE;
2989
2990 /* If a host list is not defined for the addresses - they must all have the
2991 same one in order to be passed to a single transport - or if the transport has
2992 a host list with hosts_override set, use the host list supplied with the
2993 transport. It is an error for this not to exist. */
2994
2995 if (hostlist == NULL || (ob->hosts_override && ob->hosts != NULL))
2996 {
2997 if (ob->hosts == NULL)
2998 {
2999 addrlist->message = string_sprintf("%s transport called with no hosts set",
3000 tblock->name);
3001 addrlist->transport_return = PANIC;
3002 return FALSE; /* Only top address has status */
3003 }
3004
3005 DEBUG(D_transport) debug_printf("using the transport's hosts: %s\n",
3006 ob->hosts);
3007
3008 /* If the transport's host list contains no '$' characters, and we are not
3009 randomizing, it is fixed and therefore a chain of hosts can be built once
3010 and for all, and remembered for subsequent use by other calls to this
3011 transport. If, on the other hand, the host list does contain '$', or we are
3012 randomizing its order, we have to rebuild it each time. In the fixed case,
3013 as the hosts string will never be used again, it doesn't matter that we
3014 replace all the : characters with zeros. */
3015
3016 if (ob->hostlist == NULL)
3017 {
3018 uschar *s = ob->hosts;
3019
3020 if (Ustrchr(s, '$') != NULL)
3021 {
3022 if (!(expanded_hosts = expand_string(s)))
3023 {
3024 addrlist->message = string_sprintf("failed to expand list of hosts "
3025 "\"%s\" in %s transport: %s", s, tblock->name, expand_string_message);
3026 addrlist->transport_return = search_find_defer? DEFER : PANIC;
3027 return FALSE; /* Only top address has status */
3028 }
3029 DEBUG(D_transport) debug_printf("expanded list of hosts \"%s\" to "
3030 "\"%s\"\n", s, expanded_hosts);
3031 s = expanded_hosts;
3032 }
3033 else
3034 if (ob->hosts_randomize) s = expanded_hosts = string_copy(s);
3035
3036 host_build_hostlist(&hostlist, s, ob->hosts_randomize);
3037
3038 /* Check that the expansion yielded something useful. */
3039 if (hostlist == NULL)
3040 {
3041 addrlist->message =
3042 string_sprintf("%s transport has empty hosts setting", tblock->name);
3043 addrlist->transport_return = PANIC;
3044 return FALSE; /* Only top address has status */
3045 }
3046
3047 /* If there was no expansion of hosts, save the host list for
3048 next time. */
3049
3050 if (!expanded_hosts) ob->hostlist = hostlist;
3051 }
3052
3053 /* This is not the first time this transport has been run in this delivery;
3054 the host list was built previously. */
3055
3056 else
3057 hostlist = ob->hostlist;
3058 }
3059
3060 /* The host list was supplied with the address. If hosts_randomize is set, we
3061 must sort it into a random order if it did not come from MX records and has not
3062 already been randomized (but don't bother if continuing down an existing
3063 connection). */
3064
3065 else if (ob->hosts_randomize && hostlist->mx == MX_NONE && !continuing)
3066 {
3067 host_item *newlist = NULL;
3068 while (hostlist != NULL)
3069 {
3070 host_item *h = hostlist;
3071 hostlist = hostlist->next;
3072
3073 h->sort_key = random_number(100);
3074
3075 if (newlist == NULL)
3076 {
3077 h->next = NULL;
3078 newlist = h;
3079 }
3080 else if (h->sort_key < newlist->sort_key)
3081 {
3082 h->next = newlist;
3083 newlist = h;
3084 }
3085 else
3086 {
3087 host_item *hh = newlist;
3088 while (hh->next != NULL)
3089 {
3090 if (h->sort_key < hh->next->sort_key) break;
3091 hh = hh->next;
3092 }
3093 h->next = hh->next;
3094 hh->next = h;
3095 }
3096 }
3097
3098 hostlist = addrlist->host_list = newlist;
3099 }
3100
3101 /* Sort out the default port. */
3102
3103 if (!smtp_get_port(ob->port, addrlist, &port, tid)) return FALSE;
3104
3105 /* For each host-plus-IP-address on the list:
3106
3107 . If this is a continued delivery and the host isn't the one with the
3108 current connection, skip.
3109
3110 . If the status is unusable (i.e. previously failed or retry checked), skip.
3111
3112 . If no IP address set, get the address, either by turning the name into
3113 an address, calling gethostbyname if gethostbyname is on, or by calling
3114 the DNS. The DNS may yield multiple addresses, in which case insert the
3115 extra ones into the list.
3116
3117 . Get the retry data if not previously obtained for this address and set the
3118 field which remembers the state of this address. Skip if the retry time is
3119 not reached. If not, remember whether retry data was found. The retry string
3120 contains both the name and the IP address.
3121
3122 . Scan the list of addresses and mark those whose status is DEFER as
3123 PENDING_DEFER. These are the only ones that will be processed in this cycle
3124 of the hosts loop.
3125
3126 . Make a delivery attempt - addresses marked PENDING_DEFER will be tried.
3127 Some addresses may be successfully delivered, others may fail, and yet
3128 others may get temporary errors and so get marked DEFER.
3129
3130 . The return from the delivery attempt is OK if a connection was made and a
3131 valid SMTP dialogue was completed. Otherwise it is DEFER.
3132
3133 . If OK, add a "remove" retry item for this host/IPaddress, if any.
3134
3135 . If fail to connect, or other defer state, add a retry item.
3136
3137 . If there are any addresses whose status is still DEFER, carry on to the
3138 next host/IPaddress, unless we have tried the number of hosts given
3139 by hosts_max_try or hosts_max_try_hardlimit; otherwise return. Note that
3140 there is some fancy logic for hosts_max_try that means its limit can be
3141 overstepped in some circumstances.
3142
3143 If we get to the end of the list, all hosts have deferred at least one address,
3144 or not reached their retry times. If delay_after_cutoff is unset, it requests a
3145 delivery attempt to those hosts whose last try was before the arrival time of
3146 the current message. To cope with this, we have to go round the loop a second
3147 time. After that, set the status and error data for any addresses that haven't
3148 had it set already. */
3149
3150 for (cutoff_retry = 0; expired &&
3151 cutoff_retry < ((ob->delay_after_cutoff)? 1 : 2);
3152 cutoff_retry++)
3153 {
3154 host_item *nexthost = NULL;
3155 int unexpired_hosts_tried = 0;
3156
3157 for (host = hostlist;
3158 host != NULL &&
3159 unexpired_hosts_tried < ob->hosts_max_try &&
3160 total_hosts_tried < ob->hosts_max_try_hardlimit;
3161 host = nexthost)
3162 {
3163 int rc;
3164 int host_af;
3165 uschar *rs;
3166 BOOL serialized = FALSE;
3167 BOOL host_is_expired = FALSE;
3168 BOOL message_defer = FALSE;
3169 BOOL ifchanges = FALSE;
3170 BOOL some_deferred = FALSE;
3171 address_item *first_addr = NULL;
3172 uschar *interface = NULL;
3173 uschar *retry_host_key = NULL;
3174 uschar *retry_message_key = NULL;
3175 uschar *serialize_key = NULL;
3176
3177 /* Default next host is next host. :-) But this can vary if the
3178 hosts_max_try limit is hit (see below). It may also be reset if a host
3179 address is looked up here (in case the host was multihomed). */
3180
3181 nexthost = host->next;
3182
3183 /* If the address hasn't yet been obtained from the host name, look it up
3184 now, unless the host is already marked as unusable. If it is marked as
3185 unusable, it means that the router was unable to find its IP address (in
3186 the DNS or wherever) OR we are in the 2nd time round the cutoff loop, and
3187 the lookup failed last time. We don't get this far if *all* MX records
3188 point to non-existent hosts; that is treated as a hard error.
3189
3190 We can just skip this host entirely. When the hosts came from the router,
3191 the address will timeout based on the other host(s); when the address is
3192 looked up below, there is an explicit retry record added.
3193
3194 Note that we mustn't skip unusable hosts if the address is not unset; they
3195 may be needed as expired hosts on the 2nd time round the cutoff loop. */
3196
3197 if (host->address == NULL)
3198 {
3199 int new_port, flags;
3200 host_item *hh;
3201
3202 if (host->status >= hstatus_unusable)
3203 {
3204 DEBUG(D_transport) debug_printf("%s has no address and is unusable - skipping\n",
3205 host->name);
3206 continue;
3207 }
3208
3209 DEBUG(D_transport) debug_printf("getting address for %s\n", host->name);
3210
3211 /* The host name is permitted to have an attached port. Find it, and
3212 strip it from the name. Just remember it for now. */
3213
3214 new_port = host_item_get_port(host);
3215
3216 /* Count hosts looked up */
3217
3218 hosts_looked_up++;
3219
3220 /* Find by name if so configured, or if it's an IP address. We don't
3221 just copy the IP address, because we need the test-for-local to happen. */
3222
3223 flags = HOST_FIND_BY_A;
3224 if (ob->dns_qualify_single) flags |= HOST_FIND_QUALIFY_SINGLE;
3225 if (ob->dns_search_parents) flags |= HOST_FIND_SEARCH_PARENTS;
3226
3227 if (ob->gethostbyname || string_is_ip_address(host->name, NULL) != 0)
3228 rc = host_find_byname(host, NULL, flags, NULL, TRUE);
3229 else
3230 rc = host_find_bydns(host, NULL, flags, NULL, NULL, NULL,
3231 ob->dnssec_request_domains, ob->dnssec_require_domains,
3232 NULL, NULL);
3233
3234 /* Update the host (and any additional blocks, resulting from
3235 multihoming) with a host-specific port, if any. */
3236
3237 for (hh = host; hh != nexthost; hh = hh->next) hh->port = new_port;
3238
3239 /* Failure to find the host at this time (usually DNS temporary failure)
3240 is really a kind of routing failure rather than a transport failure.
3241 Therefore we add a retry item of the routing kind, not to stop us trying
3242 to look this name up here again, but to ensure the address gets timed
3243 out if the failures go on long enough. A complete failure at this point
3244 commonly points to a configuration error, but the best action is still
3245 to carry on for the next host. */
3246
3247 if (rc == HOST_FIND_AGAIN || rc == HOST_FIND_FAILED)
3248 {
3249 retry_add_item(addrlist, string_sprintf("R:%s", host->name), 0);
3250 expired = FALSE;
3251 if (rc == HOST_FIND_AGAIN) hosts_defer++; else hosts_fail++;
3252 DEBUG(D_transport) debug_printf("rc = %s for %s\n", (rc == HOST_FIND_AGAIN)?
3253 "HOST_FIND_AGAIN" : "HOST_FIND_FAILED", host->name);
3254 host->status = hstatus_unusable;
3255
3256 for (addr = addrlist; addr != NULL; addr = addr->next)
3257 {
3258 if (addr->transport_return != DEFER) continue;
3259 addr->basic_errno = ERRNO_UNKNOWNHOST;
3260 addr->message =
3261 string_sprintf("failed to lookup IP address for %s", host->name);
3262 }
3263 continue;
3264 }
3265
3266 /* If the host is actually the local host, we may have a problem, or
3267 there may be some cunning configuration going on. In the problem case,
3268 log things and give up. The default transport status is already DEFER. */
3269
3270 if (rc == HOST_FOUND_LOCAL && !ob->allow_localhost)
3271 {
3272 for (addr = addrlist; addr != NULL; addr = addr->next)
3273 {
3274 addr->basic_errno = 0;
3275 addr->message = string_sprintf("%s transport found host %s to be "
3276 "local", tblock->name, host->name);
3277 }
3278 goto END_TRANSPORT;
3279 }
3280 } /* End of block for IP address lookup */
3281
3282 /* If this is a continued delivery, we are interested only in the host
3283 which matches the name of the existing open channel. The check is put
3284 here after the local host lookup, in case the name gets expanded as a
3285 result of the lookup. Set expired FALSE, to save the outer loop executing
3286 twice. */
3287
3288 if (continuing && (Ustrcmp(continue_hostname, host->name) != 0 ||
3289 Ustrcmp(continue_host_address, host->address) != 0))
3290 {
3291 expired = FALSE;
3292 continue; /* With next host */
3293 }
3294
3295 /* Reset the default next host in case a multihomed host whose addresses
3296 are not looked up till just above added to the host list. */
3297
3298 nexthost = host->next;
3299
3300 /* If queue_smtp is set (-odqs or the first part of a 2-stage run), or the
3301 domain is in queue_smtp_domains, we don't actually want to attempt any
3302 deliveries. When doing a queue run, queue_smtp_domains is always unset. If
3303 there is a lookup defer in queue_smtp_domains, proceed as if the domain
3304 were not in it. We don't want to hold up all SMTP deliveries! Except when
3305 doing a two-stage queue run, don't do this if forcing. */
3306
3307 if ((!deliver_force || queue_2stage) && (queue_smtp ||
3308 match_isinlist(addrlist->domain,
3309 (const uschar **)&queue_smtp_domains, 0,
3310 &domainlist_anchor, NULL, MCL_DOMAIN, TRUE, NULL) == OK))
3311 {
3312 expired = FALSE;
3313 for (addr = addrlist; addr != NULL; addr = addr->next)
3314 {
3315 if (addr->transport_return != DEFER) continue;
3316 addr->message = US"domain matches queue_smtp_domains, or -odqs set";
3317 }
3318 continue; /* With next host */
3319 }
3320
3321 /* Count hosts being considered - purely for an intelligent comment
3322 if none are usable. */
3323
3324 hosts_total++;
3325
3326 /* Set $host and $host address now in case they are needed for the
3327 interface expansion or the serialize_hosts check; they remain set if an
3328 actual delivery happens. */
3329
3330 deliver_host = host->name;
3331 deliver_host_address = host->address;
3332 lookup_dnssec_authenticated = host->dnssec == DS_YES ? US"yes"
3333 : host->dnssec == DS_NO ? US"no"
3334 : US"";
3335
3336 /* Set up a string for adding to the retry key if the port number is not
3337 the standard SMTP port. A host may have its own port setting that overrides
3338 the default. */
3339
3340 pistring = string_sprintf(":%d", (host->port == PORT_NONE)?
3341 port : host->port);
3342 if (Ustrcmp(pistring, ":25") == 0) pistring = US"";
3343
3344 /* Select IPv4 or IPv6, and choose an outgoing interface. If the interface
3345 string changes upon expansion, we must add it to the key that is used for
3346 retries, because connections to the same host from a different interface
3347 should be treated separately. */
3348
3349 host_af = (Ustrchr(host->address, ':') == NULL)? AF_INET : AF_INET6;
3350 if (!smtp_get_interface(ob->interface, host_af, addrlist, &ifchanges,
3351 &interface, tid))
3352 return FALSE;
3353 if (ifchanges) pistring = string_sprintf("%s/%s", pistring, interface);
3354
3355 /* The first time round the outer loop, check the status of the host by
3356 inspecting the retry data. The second time round, we are interested only
3357 in expired hosts that haven't been tried since this message arrived. */
3358
3359 if (cutoff_retry == 0)
3360 {
3361 BOOL incl_ip;
3362 /* Ensure the status of the address is set by checking retry data if
3363 necessary. There may be host-specific retry data (applicable to all
3364 messages) and also data for retries of a specific message at this host.
3365 If either of these retry records are actually read, the keys used are
3366 returned to save recomputing them later. */
3367
3368 if (exp_bool(addrlist, US"transport", tblock->name, D_transport,
3369 US"retry_include_ip_address", ob->retry_include_ip_address,
3370 ob->expand_retry_include_ip_address, &incl_ip) != OK)
3371 continue; /* with next host */
3372
3373 host_is_expired = retry_check_address(addrlist->domain, host, pistring,
3374 incl_ip, &retry_host_key, &retry_message_key);
3375
3376 DEBUG(D_transport) debug_printf("%s [%s]%s status = %s\n", host->name,
3377 (host->address == NULL)? US"" : host->address, pistring,
3378 (host->status == hstatus_usable)? "usable" :
3379 (host->status == hstatus_unusable)? "unusable" :
3380 (host->status == hstatus_unusable_expired)? "unusable (expired)" : "?");
3381
3382 /* Skip this address if not usable at this time, noting if it wasn't
3383 actually expired, both locally and in the address. */
3384
3385 switch (host->status)
3386 {
3387 case hstatus_unusable:
3388 expired = FALSE;
3389 setflag(addrlist, af_retry_skipped);
3390 /* Fall through */
3391
3392 case hstatus_unusable_expired:
3393 switch (host->why)
3394 {
3395 case hwhy_retry: hosts_retry++; break;
3396 case hwhy_failed: hosts_fail++; break;
3397 case hwhy_deferred: hosts_defer++; break;
3398 }
3399
3400 /* If there was a retry message key, implying that previously there
3401 was a message-specific defer, we don't want to update the list of
3402 messages waiting for these hosts. */
3403
3404 if (retry_message_key != NULL) update_waiting = FALSE;
3405 continue; /* With the next host or IP address */
3406 }
3407 }
3408
3409 /* Second time round the loop: if the address is set but expired, and
3410 the message is newer than the last try, let it through. */
3411
3412 else
3413 {
3414 if (host->address == NULL ||
3415 host->status != hstatus_unusable_expired ||
3416 host->last_try > received_time)
3417 continue;
3418 DEBUG(D_transport)
3419 debug_printf("trying expired host %s [%s]%s\n",
3420 host->name, host->address, pistring);
3421 host_is_expired = TRUE;
3422 }
3423
3424 /* Setting "expired=FALSE" doesn't actually mean not all hosts are expired;
3425 it remains TRUE only if all hosts are expired and none are actually tried.
3426 */
3427
3428 expired = FALSE;
3429
3430 /* If this host is listed as one to which access must be serialized,
3431 see if another Exim process has a connection to it, and if so, skip
3432 this host. If not, update the database to record our connection to it
3433 and remember this for later deletion. Do not do any of this if we are
3434 sending the message down a pre-existing connection. */
3435
3436 if (!continuing &&
3437 verify_check_given_host(&ob->serialize_hosts, host) == OK)
3438 {
3439 serialize_key = string_sprintf("host-serialize-%s", host->name);
3440 if (!enq_start(serialize_key))
3441 {
3442 DEBUG(D_transport)
3443 debug_printf("skipping host %s because another Exim process "
3444 "is connected to it\n", host->name);
3445 hosts_serial++;
3446 continue;
3447 }
3448 serialized = TRUE;
3449 }
3450
3451 /* OK, we have an IP address that is not waiting for its retry time to
3452 arrive (it might be expired) OR (second time round the loop) we have an
3453 expired host that hasn't been tried since the message arrived. Have a go
3454 at delivering the message to it. First prepare the addresses by flushing
3455 out the result of previous attempts, and finding the first address that
3456 is still to be delivered. */
3457
3458 first_addr = prepare_addresses(addrlist, host);
3459
3460 DEBUG(D_transport) debug_printf("delivering %s to %s [%s] (%s%s)\n",
3461 message_id, host->name, host->address, addrlist->address,
3462 (addrlist->next == NULL)? "" : ", ...");
3463
3464 set_process_info("delivering %s to %s [%s] (%s%s)",
3465 message_id, host->name, host->address, addrlist->address,
3466 (addrlist->next == NULL)? "" : ", ...");
3467
3468 /* This is not for real; don't do the delivery. If there are
3469 any remaining hosts, list them. */
3470
3471 if (dont_deliver)
3472 {
3473 host_item *host2;
3474 set_errno(addrlist, 0, NULL, OK, FALSE, NULL);
3475 for (addr = addrlist; addr != NULL; addr = addr->next)
3476 {
3477 addr->host_used = host;
3478 addr->special_action = '*';
3479 addr->message = US"delivery bypassed by -N option";
3480 }
3481 DEBUG(D_transport)
3482 {
3483 debug_printf("*** delivery by %s transport bypassed by -N option\n"
3484 "*** host and remaining hosts:\n", tblock->name);
3485 for (host2 = host; host2 != NULL; host2 = host2->next)
3486 debug_printf(" %s [%s]\n", host2->name,
3487 (host2->address == NULL)? US"unset" : host2->address);
3488 }
3489 rc = OK;
3490 }
3491
3492 /* This is for real. If the host is expired, we don't count it for
3493 hosts_max_retry. This ensures that all hosts must expire before an address
3494 is timed out, unless hosts_max_try_hardlimit (which protects against
3495 lunatic DNS configurations) is reached.
3496
3497 If the host is not expired and we are about to hit the hosts_max_retry
3498 limit, check to see if there is a subsequent hosts with a different MX
3499 value. If so, make that the next host, and don't count this one. This is a
3500 heuristic to make sure that different MXs do get tried. With a normal kind
3501 of retry rule, they would get tried anyway when the earlier hosts were
3502 delayed, but if the domain has a "retry every time" type of rule - as is
3503 often used for the the very large ISPs, that won't happen. */
3504
3505 else
3506 {
3507 host_item * thost;
3508 /* Make a copy of the host if it is local to this invocation
3509 of the transport. */
3510
3511 if (expanded_hosts)
3512 {
3513 thost = store_get(sizeof(host_item));
3514 *thost = *host;
3515 thost->name = string_copy(host->name);
3516 thost->address = string_copy(host->address);
3517 }
3518 else
3519 thost = host;
3520
3521 if (!host_is_expired && ++unexpired_hosts_tried >= ob->hosts_max_try)
3522 {
3523 host_item *h;
3524 DEBUG(D_transport)
3525 debug_printf("hosts_max_try limit reached with this host\n");
3526 for (h = host; h != NULL; h = h->next)
3527 if (h->mx != host->mx) break;
3528 if (h != NULL)
3529 {
3530 nexthost = h;
3531 unexpired_hosts_tried--;
3532 DEBUG(D_transport) debug_printf("however, a higher MX host exists "
3533 "and will be tried\n");
3534 }
3535 }
3536
3537 /* Attempt the delivery. */
3538
3539 total_hosts_tried++;
3540 rc = smtp_deliver(addrlist, thost, host_af, port, interface, tblock,
3541 &message_defer, FALSE);
3542
3543 /* Yield is one of:
3544 OK => connection made, each address contains its result;
3545 message_defer is set for message-specific defers (when all
3546 recipients are marked defer)
3547 DEFER => there was a non-message-specific delivery problem;
3548 ERROR => there was a problem setting up the arguments for a filter,
3549 or there was a problem with expanding added headers
3550 */
3551
3552 /* If the result is not OK, there was a non-message-specific problem.
3553 If the result is DEFER, we need to write to the logs saying what happened
3554 for this particular host, except in the case of authentication and TLS
3555 failures, where the log has already been written. If all hosts defer a
3556 general message is written at the end. */
3557
3558 if (rc == DEFER && first_addr->basic_errno != ERRNO_AUTHFAIL &&
3559 first_addr->basic_errno != ERRNO_TLSFAILURE)
3560 write_logs(first_addr, host);
3561
3562 #ifdef EXPERIMENTAL_EVENT
3563 if (rc == DEFER)
3564 deferred_event_raise(first_addr, host);
3565 #endif
3566
3567 /* If STARTTLS was accepted, but there was a failure in setting up the
3568 TLS session (usually a certificate screwup), and the host is not in
3569 hosts_require_tls, and tls_tempfail_tryclear is true, try again, with
3570 TLS forcibly turned off. We have to start from scratch with a new SMTP
3571 connection. That's why the retry is done from here, not from within
3572 smtp_deliver(). [Rejections of STARTTLS itself don't screw up the
3573 session, so the in-clear transmission after those errors, if permitted,
3574 happens inside smtp_deliver().] */
3575
3576 #ifdef SUPPORT_TLS
3577 if ( rc == DEFER
3578 && first_addr->basic_errno == ERRNO_TLSFAILURE
3579 && ob->tls_tempfail_tryclear
3580 && verify_check_given_host(&ob->hosts_require_tls, host) != OK
3581 )
3582 {
3583 log_write(0, LOG_MAIN, "TLS session failure: delivering unencrypted "
3584 "to %s [%s] (not in hosts_require_tls)", host->name, host->address);
3585 first_addr = prepare_addresses(addrlist, host);
3586 rc = smtp_deliver(addrlist, thost, host_af, port, interface, tblock,
3587 &message_defer, TRUE);
3588 if (rc == DEFER && first_addr->basic_errno != ERRNO_AUTHFAIL)
3589 write_logs(first_addr, host);
3590 # ifdef EXPERIMENTAL_EVENT
3591 if (rc == DEFER)
3592 deferred_event_raise(first_addr, host);
3593 # endif
3594 }
3595 #endif /*SUPPORT_TLS*/
3596 }
3597
3598 /* Delivery attempt finished */
3599
3600 rs = (rc == OK)? US"OK" : (rc == DEFER)? US"DEFER" : (rc == ERROR)?
3601 US"ERROR" : US"?";
3602
3603 set_process_info("delivering %s: just tried %s [%s] for %s%s: result %s",
3604 message_id, host->name, host->address, addrlist->address,
3605 (addrlist->next == NULL)? "" : " (& others)", rs);
3606
3607 /* Release serialization if set up */
3608
3609 if (serialized) enq_end(serialize_key);
3610
3611 /* If the result is DEFER, or if a host retry record is known to exist, we
3612 need to add an item to the retry chain for updating the retry database
3613 at the end of delivery. We only need to add the item to the top address,
3614 of course. Also, if DEFER, we mark the IP address unusable so as to skip it
3615 for any other delivery attempts using the same address. (It is copied into
3616 the unusable tree at the outer level, so even if different address blocks
3617 contain the same address, it still won't get tried again.) */
3618
3619 if (rc == DEFER || retry_host_key != NULL)
3620 {
3621 int delete_flag = (rc != DEFER)? rf_delete : 0;
3622 if (retry_host_key == NULL)
3623 {
3624 BOOL incl_ip;
3625 if (exp_bool(addrlist, US"transport", tblock->name, D_transport,
3626 US"retry_include_ip_address", ob->retry_include_ip_address,
3627 ob->expand_retry_include_ip_address, &incl_ip) != OK)
3628 incl_ip = TRUE; /* error; use most-specific retry record */
3629
3630 retry_host_key = incl_ip ?
3631 string_sprintf("T:%S:%s%s", host->name, host->address, pistring) :
3632 string_sprintf("T:%S%s", host->name, pistring);
3633 }
3634
3635 /* If a delivery of another message over an existing SMTP connection
3636 yields DEFER, we do NOT set up retry data for the host. This covers the
3637 case when there are delays in routing the addresses in the second message
3638 that are so long that the server times out. This is alleviated by not
3639 routing addresses that previously had routing defers when handling an
3640 existing connection, but even so, this case may occur (e.g. if a
3641 previously happily routed address starts giving routing defers). If the
3642 host is genuinely down, another non-continued message delivery will
3643 notice it soon enough. */
3644
3645 if (delete_flag != 0 || !continuing)
3646 retry_add_item(first_addr, retry_host_key, rf_host | delete_flag);
3647
3648 /* We may have tried an expired host, if its retry time has come; ensure
3649 the status reflects the expiry for the benefit of any other addresses. */
3650
3651 if (rc == DEFER)
3652 {
3653 host->status = (host_is_expired)?
3654 hstatus_unusable_expired : hstatus_unusable;
3655 host->why = hwhy_deferred;
3656 }
3657 }
3658
3659 /* If message_defer is set (host was OK, but every recipient got deferred
3660 because of some message-specific problem), or if that had happened
3661 previously so that a message retry key exists, add an appropriate item
3662 to the retry chain. Note that if there was a message defer but now there is
3663 a host defer, the message defer record gets deleted. That seems perfectly
3664 reasonable. Also, stop the message from being remembered as waiting
3665 for specific hosts. */
3666
3667 if (message_defer || retry_message_key != NULL)
3668 {
3669 int delete_flag = message_defer? 0 : rf_delete;
3670 if (retry_message_key == NULL)
3671 {
3672 BOOL incl_ip;
3673 if (exp_bool(addrlist, US"transport", tblock->name, D_transport,
3674 US"retry_include_ip_address", ob->retry_include_ip_address,
3675 ob->expand_retry_include_ip_address, &incl_ip) != OK)
3676 incl_ip = TRUE; /* error; use most-specific retry record */
3677
3678 retry_message_key = incl_ip ?
3679 string_sprintf("T:%S:%s%s:%s", host->name, host->address, pistring,
3680 message_id) :
3681 string_sprintf("T:%S%s:%s", host->name, pistring, message_id);
3682 }
3683 retry_add_item(addrlist, retry_message_key,
3684 rf_message | rf_host | delete_flag);
3685 update_waiting = FALSE;
3686 }
3687
3688 /* Any return other than DEFER (that is, OK or ERROR) means that the
3689 addresses have got their final statuses filled in for this host. In the OK
3690 case, see if any of them are deferred. */
3691
3692 if (rc == OK)
3693 {
3694 for (addr = addrlist; addr != NULL; addr = addr->next)
3695 {
3696 if (addr->transport_return == DEFER)
3697 {
3698 some_deferred = TRUE;
3699 break;
3700 }
3701 }
3702 }
3703
3704 /* If no addresses deferred or the result was ERROR, return. We do this for
3705 ERROR because a failing filter set-up or add_headers expansion is likely to
3706 fail for any host we try. */
3707
3708 if (rc == ERROR || (rc == OK && !some_deferred))
3709 {
3710 DEBUG(D_transport) debug_printf("Leaving %s transport\n", tblock->name);
3711 return TRUE; /* Each address has its status */
3712 }
3713
3714 /* If the result was DEFER or some individual addresses deferred, let
3715 the loop run to try other hosts with the deferred addresses, except for the
3716 case when we were trying to deliver down an existing channel and failed.
3717 Don't try any other hosts in this case. */
3718
3719 if (continuing) break;
3720
3721 /* If the whole delivery, or some individual addresses, were deferred and
3722 there are more hosts that could be tried, do not count this host towards
3723 the hosts_max_try limit if the age of the message is greater than the
3724 maximum retry time for this host. This means we may try try all hosts,
3725 ignoring the limit, when messages have been around for some time. This is
3726 important because if we don't try all hosts, the address will never time
3727 out. NOTE: this does not apply to hosts_max_try_hardlimit. */
3728
3729 if ((rc == DEFER || some_deferred) && nexthost != NULL)
3730 {
3731 BOOL timedout;
3732 retry_config *retry = retry_find_config(host->name, NULL, 0, 0);
3733
3734 if (retry != NULL && retry->rules != NULL)
3735 {
3736 retry_rule *last_rule;
3737 for (last_rule = retry->rules;
3738 last_rule->next != NULL;
3739 last_rule = last_rule->next);
3740 timedout = time(NULL) - received_time > last_rule->timeout;
3741 }
3742 else timedout = TRUE; /* No rule => timed out */
3743
3744 if (timedout)
3745 {
3746 unexpired_hosts_tried--;
3747 DEBUG(D_transport) debug_printf("temporary delivery error(s) override "
3748 "hosts_max_try (message older than host's retry time)\n");
3749 }
3750 }
3751 } /* End of loop for trying multiple hosts. */
3752
3753 /* This is the end of the loop that repeats iff expired is TRUE and
3754 ob->delay_after_cutoff is FALSE. The second time round we will
3755 try those hosts that haven't been tried since the message arrived. */
3756
3757 DEBUG(D_transport)
3758 {
3759 debug_printf("all IP addresses skipped or deferred at least one address\n");
3760 if (expired && !ob->delay_after_cutoff && cutoff_retry == 0)
3761 debug_printf("retrying IP addresses not tried since message arrived\n");
3762 }
3763 }
3764
3765
3766 /* Get here if all IP addresses are skipped or defer at least one address. In
3767 MUA wrapper mode, this will happen only for connection or other non-message-
3768 specific failures. Force the delivery status for all addresses to FAIL. */
3769
3770 if (mua_wrapper)
3771 {
3772 for (addr = addrlist; addr != NULL; addr = addr->next)
3773 addr->transport_return = FAIL;
3774 goto END_TRANSPORT;
3775 }
3776
3777 /* In the normal, non-wrapper case, add a standard message to each deferred
3778 address if there hasn't been an error, that is, if it hasn't actually been
3779 tried this time. The variable "expired" will be FALSE if any deliveries were
3780 actually tried, or if there was at least one host that was not expired. That
3781 is, it is TRUE only if no deliveries were tried and all hosts were expired. If
3782 a delivery has been tried, an error code will be set, and the failing of the
3783 message is handled by the retry code later.
3784
3785 If queue_smtp is set, or this transport was called to send a subsequent message
3786 down an existing TCP/IP connection, and something caused the host not to be
3787 found, we end up here, but can detect these cases and handle them specially. */
3788
3789 for (addr = addrlist; addr != NULL; addr = addr->next)
3790 {
3791 /* If host is not NULL, it means that we stopped processing the host list
3792 because of hosts_max_try or hosts_max_try_hardlimit. In the former case, this
3793 means we need to behave as if some hosts were skipped because their retry
3794 time had not come. Specifically, this prevents the address from timing out.
3795 However, if we have hit hosts_max_try_hardlimit, we want to behave as if all
3796 hosts were tried. */
3797
3798 if (host != NULL)
3799 {
3800 if (total_hosts_tried >= ob->hosts_max_try_hardlimit)
3801 {
3802 DEBUG(D_transport)
3803 debug_printf("hosts_max_try_hardlimit reached: behave as if all "
3804 "hosts were tried\n");
3805 }
3806 else
3807 {
3808 DEBUG(D_transport)
3809 debug_printf("hosts_max_try limit caused some hosts to be skipped\n");
3810 setflag(addr, af_retry_skipped);
3811 }
3812 }
3813
3814 if (queue_smtp) /* no deliveries attempted */
3815 {
3816 addr->transport_return = DEFER;
3817 addr->basic_errno = 0;
3818 addr->message = US"SMTP delivery explicitly queued";
3819 }
3820
3821 else if (addr->transport_return == DEFER &&
3822 (addr->basic_errno == ERRNO_UNKNOWNERROR || addr->basic_errno == 0) &&
3823 addr->message == NULL)
3824 {
3825 addr->basic_errno = ERRNO_HRETRY;
3826 if (continue_hostname != NULL)
3827 {
3828 addr->message = US"no host found for existing SMTP connection";
3829 }
3830 else if (expired)
3831 {
3832 setflag(addr, af_pass_message); /* This is not a security risk */
3833 addr->message = (ob->delay_after_cutoff)?
3834 US"retry time not reached for any host after a long failure period" :
3835 US"all hosts have been failing for a long time and were last tried "
3836 "after this message arrived";
3837
3838 /* If we are already using fallback hosts, or there are no fallback hosts
3839 defined, convert the result to FAIL to cause a bounce. */
3840
3841 if (addr->host_list == addr->fallback_hosts ||
3842 addr->fallback_hosts == NULL)
3843 addr->transport_return = FAIL;
3844 }
3845 else
3846 {
3847 if (hosts_retry == hosts_total)
3848 addr->message = US"retry time not reached for any host";
3849 else if (hosts_fail == hosts_total)
3850 addr->message = US"all host address lookups failed permanently";
3851 else if (hosts_defer == hosts_total)
3852 addr->message = US"all host address lookups failed temporarily";
3853 else if (hosts_serial == hosts_total)
3854 addr->message = US"connection limit reached for all hosts";
3855 else if (hosts_fail+hosts_defer == hosts_total)
3856 addr->message = US"all host address lookups failed";
3857 else addr->message = US"some host address lookups failed and retry time "
3858 "not reached for other hosts or connection limit reached";
3859 }
3860 }
3861 }
3862
3863 /* Update the database which keeps information about which messages are waiting
3864 for which hosts to become available. For some message-specific errors, the
3865 update_waiting flag is turned off because we don't want follow-on deliveries in
3866 those cases. If this transport instance is explicitly limited to one message
3867 per connection then follow-on deliveries are not possible and there's no need
3868 to create/update the per-transport wait-<transport_name> database. */
3869
3870 if (update_waiting && tblock->connection_max_messages != 1)
3871 transport_update_waiting(hostlist, tblock->name);
3872
3873 END_TRANSPORT:
3874
3875 DEBUG(D_transport) debug_printf("Leaving %s transport\n", tblock->name);
3876
3877 return TRUE; /* Each address has its status */
3878 }
3879
3880 /* vi: aw ai sw=2
3881 */
3882 /* End of transport/smtp.c */
Unnamed repository; edit this file 'description' to name the repository.