projects / exim.git / blob
? search:
summary | shortlog | log | commit | commitdiff | tree
blame | history | raw | HEAD
DANE: do not fail/defer message due to TLSA lookup but dane is only requested
[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) },
65 { "dnssec_require_domains", opt_stringptr,
66 (void *)offsetof(smtp_transport_options_block, dnssec.require) },
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 return FAIL;
1202 break;
1203
1204 case DNS_SUCCEED:
1205 if (!dns_is_secure(dnsa))
1206 {
1207 log_write(0, LOG_MAIN, "DANE error: TLSA lookup not DNSSEC");
1208 return DEFER;
1209 }
1210 *dane = TRUE;
1211 break;
1212 }
1213 return OK;
1214 }
1215 #endif
1216
1217
1218
1219 typedef struct smtp_compare_s
1220 {
1221 uschar *current_sender_address;
1222 struct transport_instance *tblock;
1223 } smtp_compare_t;
1224
1225 /*
1226 Create a unique string that identifies this message, it is based on
1227 sender_address, helo_data and tls_certificate if enabled. */
1228
1229 static uschar *
1230 smtp_local_identity(uschar * sender, struct transport_instance * tblock)
1231 {
1232 address_item * addr1;
1233 uschar * if1 = US"";
1234 uschar * helo1 = US"";
1235 #ifdef SUPPORT_TLS
1236 uschar * tlsc1 = US"";
1237 #endif
1238 uschar * save_sender_address = sender_address;
1239 uschar * local_identity = NULL;
1240 smtp_transport_options_block * ob =
1241 (smtp_transport_options_block *)tblock->options_block;
1242
1243 sender_address = sender;
1244
1245 addr1 = deliver_make_addr (sender, TRUE);
1246 deliver_set_expansions(addr1);
1247
1248 if (ob->interface)
1249 if1 = expand_string(ob->interface);
1250
1251 if (ob->helo_data)
1252 helo1 = expand_string(ob->helo_data);
1253
1254 #ifdef SUPPORT_TLS
1255 if (ob->tls_certificate)
1256 tlsc1 = expand_string(ob->tls_certificate);
1257 local_identity = string_sprintf ("%s^%s^%s", if1, helo1, tlsc1);
1258 #else
1259 local_identity = string_sprintf ("%s^%s", if1, helo1);
1260 #endif
1261
1262 deliver_set_expansions(NULL);
1263 sender_address = save_sender_address;
1264
1265 return local_identity;
1266 }
1267
1268
1269
1270 /* This routine is a callback that is called from transport_check_waiting.
1271 This function will evaluate the incoming message versus the previous
1272 message. If the incoming message is using a different local identity then
1273 we will veto this new message. */
1274
1275 static BOOL
1276 smtp_are_same_identities(uschar * message_id, smtp_compare_t * s_compare)
1277 {
1278 uschar * save_sender_address = sender_address;
1279 uschar * current_local_identity =
1280 smtp_local_identity(s_compare->current_sender_address, s_compare->tblock);
1281 uschar * new_sender_address = deliver_get_sender_address(message_id);
1282 uschar * message_local_identity =
1283 smtp_local_identity(new_sender_address, s_compare->tblock);
1284
1285 sender_address = save_sender_address;
1286
1287 return Ustrcmp(current_local_identity, message_local_identity) == 0;
1288 }
1289
1290
1291
1292 /*************************************************
1293 * Deliver address list to given host *
1294 *************************************************/
1295
1296 /* If continue_hostname is not null, we get here only when continuing to
1297 deliver down an existing channel. The channel was passed as the standard
1298 input. TLS is never active on a passed channel; the previous process always
1299 closes it down before passing the connection on.
1300
1301 Otherwise, we have to make a connection to the remote host, and do the
1302 initial protocol exchange.
1303
1304 When running as an MUA wrapper, if the sender or any recipient is rejected,
1305 temporarily or permanently, we force failure for all recipients.
1306
1307 Arguments:
1308 addrlist chain of potential addresses to deliver; only those whose
1309 transport_return field is set to PENDING_DEFER are currently
1310 being processed; others should be skipped - they have either
1311 been delivered to an earlier host or IP address, or been
1312 failed by one of them.
1313 host host to deliver to
1314 host_af AF_INET or AF_INET6
1315 port default TCP/IP port to use, in host byte order
1316 interface interface to bind to, or NULL
1317 tblock transport instance block
1318 message_defer set TRUE if yield is OK, but all addresses were deferred
1319 because of a non-recipient, non-host failure, that is, a
1320 4xx response to MAIL FROM, DATA, or ".". This is a defer
1321 that is specific to the message.
1322 suppress_tls if TRUE, don't attempt a TLS connection - this is set for
1323 a second attempt after TLS initialization fails
1324
1325 Returns: OK - the connection was made and the delivery attempted;
1326 the result for each address is in its data block.
1327 DEFER - the connection could not be made, or something failed
1328 while setting up the SMTP session, or there was a
1329 non-message-specific error, such as a timeout.
1330 ERROR - a filter command is specified for this transport,
1331 and there was a problem setting it up; OR helo_data
1332 or add_headers or authenticated_sender is specified
1333 for this transport, and the string failed to expand
1334 */
1335
1336 static int
1337 smtp_deliver(address_item *addrlist, host_item *host, int host_af, int port,
1338 uschar *interface, transport_instance *tblock,
1339 BOOL *message_defer, BOOL suppress_tls)
1340 {
1341 address_item *addr;
1342 address_item *sync_addr;
1343 address_item *first_addr = addrlist;
1344 int yield = OK;
1345 int address_count;
1346 int save_errno;
1347 int rc;
1348 time_t start_delivery_time = time(NULL);
1349 smtp_transport_options_block *ob =
1350 (smtp_transport_options_block *)(tblock->options_block);
1351 BOOL lmtp = strcmpic(ob->protocol, US"lmtp") == 0;
1352 BOOL smtps = strcmpic(ob->protocol, US"smtps") == 0;
1353 BOOL ok = FALSE;
1354 BOOL send_rset = TRUE;
1355 BOOL send_quit = TRUE;
1356 BOOL setting_up = TRUE;
1357 BOOL completed_address = FALSE;
1358 BOOL esmtp = TRUE;
1359 BOOL pending_MAIL;
1360 BOOL pass_message = FALSE;
1361 #ifndef DISABLE_PRDR
1362 BOOL prdr_offered = FALSE;
1363 BOOL prdr_active;
1364 #endif
1365 #ifdef EXPERIMENTAL_INTERNATIONAL
1366 BOOL utf8_needed = FALSE;
1367 BOOL utf8_offered = FALSE;
1368 #endif
1369 BOOL dsn_all_lasthop = TRUE;
1370 #if defined(SUPPORT_TLS) && defined(EXPERIMENTAL_DANE)
1371 BOOL dane = FALSE;
1372 BOOL dane_required;
1373 dns_answer tlsa_dnsa;
1374 #endif
1375 smtp_inblock inblock;
1376 smtp_outblock outblock;
1377 int max_rcpt = tblock->max_addresses;
1378 uschar *igquotstr = US"";
1379
1380 uschar *helo_data = NULL;
1381
1382 uschar *message = NULL;
1383 uschar new_message_id[MESSAGE_ID_LENGTH + 1];
1384 uschar *p;
1385 uschar buffer[4096];
1386 uschar inbuffer[4096];
1387 uschar outbuffer[4096];
1388
1389 suppress_tls = suppress_tls; /* stop compiler warning when no TLS support */
1390
1391 *message_defer = FALSE;
1392 smtp_command = US"initial connection";
1393 if (max_rcpt == 0) max_rcpt = 999999;
1394
1395 /* Set up the buffer for reading SMTP response packets. */
1396
1397 inblock.buffer = inbuffer;
1398 inblock.buffersize = sizeof(inbuffer);
1399 inblock.ptr = inbuffer;
1400 inblock.ptrend = inbuffer;
1401
1402 /* Set up the buffer for holding SMTP commands while pipelining */
1403
1404 outblock.buffer = outbuffer;
1405 outblock.buffersize = sizeof(outbuffer);
1406 outblock.ptr = outbuffer;
1407 outblock.cmd_count = 0;
1408 outblock.authenticating = FALSE;
1409
1410 /* Reset the parameters of a TLS session. */
1411
1412 tls_out.bits = 0;
1413 tls_out.cipher = NULL; /* the one we may use for this transport */
1414 tls_out.ourcert = NULL;
1415 tls_out.peercert = NULL;
1416 tls_out.peerdn = NULL;
1417 #if defined(SUPPORT_TLS) && !defined(USE_GNUTLS)
1418 tls_out.sni = NULL;
1419 #endif
1420 tls_out.ocsp = OCSP_NOT_REQ;
1421
1422 /* Flip the legacy TLS-related variables over to the outbound set in case
1423 they're used in the context of the transport. Don't bother resetting
1424 afterward as we're in a subprocess. */
1425
1426 tls_modify_variables(&tls_out);
1427
1428 #ifndef SUPPORT_TLS
1429 if (smtps)
1430 {
1431 set_errno(addrlist, ERRNO_TLSFAILURE, US"TLS support not available",
1432 DEFER, FALSE, NULL);
1433 return ERROR;
1434 }
1435 #endif
1436
1437 /* Make a connection to the host if this isn't a continued delivery, and handle
1438 the initial interaction and HELO/EHLO/LHLO. Connect timeout errors are handled
1439 specially so they can be identified for retries. */
1440
1441 if (continue_hostname == NULL)
1442 {
1443 /* This puts port into host->port */
1444 inblock.sock = outblock.sock =
1445 smtp_connect(host, host_af, port, interface, ob->connect_timeout, tblock);
1446
1447 if (inblock.sock < 0)
1448 {
1449 set_errno(addrlist, (errno == ETIMEDOUT)? ERRNO_CONNECTTIMEOUT : errno,
1450 NULL, DEFER, FALSE, NULL);
1451 return DEFER;
1452 }
1453
1454 #if defined(SUPPORT_TLS) && defined(EXPERIMENTAL_DANE)
1455 {
1456 tls_out.dane_verified = FALSE;
1457 tls_out.tlsa_usage = 0;
1458
1459 dane_required = verify_check_given_host(&ob->hosts_require_dane, host) == OK;
1460
1461 if (host->dnssec == DS_YES)
1462 {
1463 if( ( dane_required
1464 || verify_check_given_host(&ob->hosts_try_dane, host) == OK
1465 )
1466 && (rc = tlsa_lookup(host, &tlsa_dnsa, dane_required, &dane)) != OK
1467 && dane_required
1468 )
1469 {
1470 set_errno(addrlist, ERRNO_DNSDEFER,
1471 string_sprintf("DANE error: tlsa lookup %s",
1472 rc == DEFER ? "DEFER" : "FAIL"),
1473 rc, FALSE, NULL);
1474 return rc;
1475 }
1476 }
1477 else if (dane_required)
1478 {
1479 set_errno(addrlist, ERRNO_DNSDEFER,
1480 string_sprintf("DANE error: %s lookup not DNSSEC", host->name),
1481 FAIL, FALSE, NULL);
1482 return FAIL;
1483 }
1484
1485 if (dane)
1486 ob->tls_tempfail_tryclear = FALSE;
1487 }
1488 #endif /*DANE*/
1489
1490 /* Expand the greeting message while waiting for the initial response. (Makes
1491 sense if helo_data contains ${lookup dnsdb ...} stuff). The expansion is
1492 delayed till here so that $sending_interface and $sending_port are set. */
1493
1494 helo_data = expand_string(ob->helo_data);
1495 #ifdef EXPERIMENTAL_INTERNATIONAL
1496 if (helo_data)
1497 {
1498 uschar * errstr = NULL;
1499 if ((helo_data = string_domain_utf8_to_alabel(helo_data, &errstr)), errstr)
1500 {
1501 errstr = string_sprintf("failed to expand helo_data: %s", errstr);
1502 set_errno(addrlist, ERRNO_EXPANDFAIL, errstr, DEFER, FALSE, NULL);
1503 yield = DEFER;
1504 goto SEND_QUIT;
1505 }
1506 }
1507 #endif
1508
1509 /* The first thing is to wait for an initial OK response. The dreaded "goto"
1510 is nevertheless a reasonably clean way of programming this kind of logic,
1511 where you want to escape on any error. */
1512
1513 if (!smtps)
1514 {
1515 if (!smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
1516 ob->command_timeout)) goto RESPONSE_FAILED;
1517
1518 #ifdef EXPERIMENTAL_EVENT
1519 {
1520 uschar * s;
1521 lookup_dnssec_authenticated = host->dnssec==DS_YES ? US"yes"
1522 : host->dnssec==DS_NO ? US"no" : NULL;
1523 s = event_raise(tblock->event_action, US"smtp:connect", buffer);
1524 if (s)
1525 {
1526 set_errno(addrlist, ERRNO_EXPANDFAIL,
1527 string_sprintf("deferred by smtp:connect event expansion: %s", s),
1528 DEFER, FALSE, NULL);
1529 yield = DEFER;
1530 goto SEND_QUIT;
1531 }
1532 }
1533 #endif
1534
1535 /* Now check if the helo_data expansion went well, and sign off cleanly if
1536 it didn't. */
1537
1538 if (helo_data == NULL)
1539 {
1540 uschar *message = string_sprintf("failed to expand helo_data: %s",
1541 expand_string_message);
1542 set_errno(addrlist, ERRNO_EXPANDFAIL, message, DEFER, FALSE, NULL);
1543 yield = DEFER;
1544 goto SEND_QUIT;
1545 }
1546 }
1547
1548 /** Debugging without sending a message
1549 addrlist->transport_return = DEFER;
1550 goto SEND_QUIT;
1551 **/
1552
1553 /* Errors that occur after this point follow an SMTP command, which is
1554 left in big_buffer by smtp_write_command() for use in error messages. */
1555
1556 smtp_command = big_buffer;
1557
1558 /* Tell the remote who we are...
1559
1560 February 1998: A convention has evolved that ESMTP-speaking MTAs include the
1561 string "ESMTP" in their greeting lines, so make Exim send EHLO if the
1562 greeting is of this form. The assumption was that the far end supports it
1563 properly... but experience shows that there are some that give 5xx responses,
1564 even though the banner includes "ESMTP" (there's a bloody-minded one that
1565 says "ESMTP not spoken here"). Cope with that case.
1566
1567 September 2000: Time has passed, and it seems reasonable now to always send
1568 EHLO at the start. It is also convenient to make the change while installing
1569 the TLS stuff.
1570
1571 July 2003: Joachim Wieland met a broken server that advertises "PIPELINING"
1572 but times out after sending MAIL FROM, RCPT TO and DATA all together. There
1573 would be no way to send out the mails, so there is now a host list
1574 "hosts_avoid_esmtp" that disables ESMTP for special hosts and solves the
1575 PIPELINING problem as well. Maybe it can also be useful to cure other
1576 problems with broken servers.
1577
1578 Exim originally sent "Helo" at this point and ran for nearly a year that way.
1579 Then somebody tried it with a Microsoft mailer... It seems that all other
1580 mailers use upper case for some reason (the RFC is quite clear about case
1581 independence) so, for peace of mind, I gave in. */
1582
1583 esmtp = verify_check_given_host(&ob->hosts_avoid_esmtp, host) != OK;
1584
1585 /* Alas; be careful, since this goto is not an error-out, so conceivably
1586 we might set data between here and the target which we assume to exist
1587 and be usable. I can see this coming back to bite us. */
1588 #ifdef SUPPORT_TLS
1589 if (smtps)
1590 {
1591 tls_offered = TRUE;
1592 suppress_tls = FALSE;
1593 ob->tls_tempfail_tryclear = FALSE;
1594 smtp_command = US"SSL-on-connect";
1595 goto TLS_NEGOTIATE;
1596 }
1597 #endif
1598
1599 if (esmtp)
1600 {
1601 if (smtp_write_command(&outblock, FALSE, "%s %s\r\n",
1602 lmtp? "LHLO" : "EHLO", helo_data) < 0)
1603 goto SEND_FAILED;
1604 if (!smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
1605 ob->command_timeout))
1606 {
1607 if (errno != 0 || buffer[0] == 0 || lmtp) goto RESPONSE_FAILED;
1608 esmtp = FALSE;
1609 }
1610 }
1611 else
1612 {
1613 DEBUG(D_transport)
1614 debug_printf("not sending EHLO (host matches hosts_avoid_esmtp)\n");
1615 }
1616
1617 if (!esmtp)
1618 {
1619 if (smtp_write_command(&outblock, FALSE, "HELO %s\r\n", helo_data) < 0)
1620 goto SEND_FAILED;
1621 if (!smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
1622 ob->command_timeout)) goto RESPONSE_FAILED;
1623 }
1624
1625 /* Set IGNOREQUOTA if the response to LHLO specifies support and the
1626 lmtp_ignore_quota option was set. */
1627
1628 igquotstr = (lmtp && ob->lmtp_ignore_quota &&
1629 pcre_exec(regex_IGNOREQUOTA, NULL, CS buffer, Ustrlen(CS buffer), 0,
1630 PCRE_EOPT, NULL, 0) >= 0)? US" IGNOREQUOTA" : US"";
1631
1632 /* Set tls_offered if the response to EHLO specifies support for STARTTLS. */
1633
1634 #ifdef SUPPORT_TLS
1635 tls_offered = esmtp &&
1636 pcre_exec(regex_STARTTLS, NULL, CS buffer, Ustrlen(buffer), 0,
1637 PCRE_EOPT, NULL, 0) >= 0;
1638 #endif
1639
1640 #ifndef DISABLE_PRDR
1641 prdr_offered = esmtp
1642 && pcre_exec(regex_PRDR, NULL, CS buffer, Ustrlen(buffer), 0,
1643 PCRE_EOPT, NULL, 0) >= 0
1644 && verify_check_given_host(&ob->hosts_try_prdr, host) == OK;
1645
1646 if (prdr_offered)
1647 {DEBUG(D_transport) debug_printf("PRDR usable\n");}
1648 #endif
1649
1650 #ifdef EXPERIMENTAL_INTERNATIONAL
1651 if (addrlist->prop.utf8_msg)
1652 {
1653 utf8_needed = !addrlist->prop.utf8_downcvt
1654 && !addrlist->prop.utf8_downcvt_maybe;
1655 DEBUG(D_transport) if (!utf8_needed) debug_printf("utf8: %s downconvert\n",
1656 addrlist->prop.utf8_downcvt ? "mandatory" : "optional");
1657
1658 utf8_offered = esmtp
1659 && pcre_exec(regex_UTF8, NULL, CS buffer, Ustrlen(buffer), 0,
1660 PCRE_EOPT, NULL, 0) >= 0;
1661 }
1662 #endif
1663 }
1664
1665 /* For continuing deliveries down the same channel, the socket is the standard
1666 input, and we don't need to redo EHLO here (but may need to do so for TLS - see
1667 below). Set up the pointer to where subsequent commands will be left, for
1668 error messages. Note that smtp_use_size and smtp_use_pipelining will have been
1669 set from the command line if they were set in the process that passed the
1670 connection on. */
1671
1672 else
1673 {
1674 inblock.sock = outblock.sock = fileno(stdin);
1675 smtp_command = big_buffer;
1676 host->port = port; /* Record the port that was used */
1677 }
1678
1679 /* If TLS is available on this connection, whether continued or not, attempt to
1680 start up a TLS session, unless the host is in hosts_avoid_tls. If successful,
1681 send another EHLO - the server may give a different answer in secure mode. We
1682 use a separate buffer for reading the response to STARTTLS so that if it is
1683 negative, the original EHLO data is available for subsequent analysis, should
1684 the client not be required to use TLS. If the response is bad, copy the buffer
1685 for error analysis. */
1686
1687 #ifdef SUPPORT_TLS
1688 if ( tls_offered
1689 && !suppress_tls
1690 && verify_check_given_host(&ob->hosts_avoid_tls, host) != OK)
1691 {
1692 uschar buffer2[4096];
1693 if (smtp_write_command(&outblock, FALSE, "STARTTLS\r\n") < 0)
1694 goto SEND_FAILED;
1695
1696 /* If there is an I/O error, transmission of this message is deferred. If
1697 there is a temporary rejection of STARRTLS and tls_tempfail_tryclear is
1698 false, we also defer. However, if there is a temporary rejection of STARTTLS
1699 and tls_tempfail_tryclear is true, or if there is an outright rejection of
1700 STARTTLS, we carry on. This means we will try to send the message in clear,
1701 unless the host is in hosts_require_tls (tested below). */
1702
1703 if (!smtp_read_response(&inblock, buffer2, sizeof(buffer2), '2',
1704 ob->command_timeout))
1705 {
1706 if (errno != 0 || buffer2[0] == 0 ||
1707 (buffer2[0] == '4' && !ob->tls_tempfail_tryclear))
1708 {
1709 Ustrncpy(buffer, buffer2, sizeof(buffer));
1710 goto RESPONSE_FAILED;
1711 }
1712 }
1713
1714 /* STARTTLS accepted: try to negotiate a TLS session. */
1715
1716 else
1717 TLS_NEGOTIATE:
1718 {
1719 int rc = tls_client_start(inblock.sock, host, addrlist, tblock
1720 # ifdef EXPERIMENTAL_DANE
1721 , dane ? &tlsa_dnsa : NULL
1722 # endif
1723 );
1724
1725 /* TLS negotiation failed; give an error. From outside, this function may
1726 be called again to try in clear on a new connection, if the options permit
1727 it for this host. */
1728
1729 if (rc != OK)
1730 {
1731 # ifdef EXPERIMENTAL_DANE
1732 if (rc == DEFER && dane && !dane_required)
1733 {
1734 log_write(0, LOG_MAIN, "DANE attempt failed;"
1735 " trying CA-root TLS to %s [%s] (not in hosts_require_dane)",
1736 host->name, host->address);
1737 dane = FALSE;
1738 goto TLS_NEGOTIATE;
1739 }
1740 # endif
1741
1742 save_errno = ERRNO_TLSFAILURE;
1743 message = US"failure while setting up TLS session";
1744 send_quit = FALSE;
1745 goto TLS_FAILED;
1746 }
1747
1748 /* TLS session is set up */
1749
1750 for (addr = addrlist; addr != NULL; addr = addr->next)
1751 if (addr->transport_return == PENDING_DEFER)
1752 {
1753 addr->cipher = tls_out.cipher;
1754 addr->ourcert = tls_out.ourcert;
1755 addr->peercert = tls_out.peercert;
1756 addr->peerdn = tls_out.peerdn;
1757 addr->ocsp = tls_out.ocsp;
1758 }
1759 }
1760 }
1761
1762 /* if smtps, we'll have smtp_command set to something else; always safe to
1763 reset it here. */
1764 smtp_command = big_buffer;
1765
1766 /* If we started TLS, redo the EHLO/LHLO exchange over the secure channel. If
1767 helo_data is null, we are dealing with a connection that was passed from
1768 another process, and so we won't have expanded helo_data above. We have to
1769 expand it here. $sending_ip_address and $sending_port are set up right at the
1770 start of the Exim process (in exim.c). */
1771
1772 if (tls_out.active >= 0)
1773 {
1774 char *greeting_cmd;
1775 if (helo_data == NULL)
1776 {
1777 helo_data = expand_string(ob->helo_data);
1778 if (helo_data == NULL)
1779 {
1780 uschar *message = string_sprintf("failed to expand helo_data: %s",
1781 expand_string_message);
1782 set_errno(addrlist, ERRNO_EXPANDFAIL, message, DEFER, FALSE, NULL);
1783 yield = DEFER;
1784 goto SEND_QUIT;
1785 }
1786 }
1787
1788 /* For SMTPS we need to wait for the initial OK response. */
1789 if (smtps)
1790 {
1791 if (!smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
1792 ob->command_timeout)) goto RESPONSE_FAILED;
1793 }
1794
1795 if (esmtp)
1796 greeting_cmd = "EHLO";
1797 else
1798 {
1799 greeting_cmd = "HELO";
1800 DEBUG(D_transport)
1801 debug_printf("not sending EHLO (host matches hosts_avoid_esmtp)\n");
1802 }
1803
1804 if (smtp_write_command(&outblock, FALSE, "%s %s\r\n",
1805 lmtp? "LHLO" : greeting_cmd, helo_data) < 0)
1806 goto SEND_FAILED;
1807 if (!smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
1808 ob->command_timeout))
1809 goto RESPONSE_FAILED;
1810 }
1811
1812 /* If the host is required to use a secure channel, ensure that we
1813 have one. */
1814
1815 else if (
1816 # ifdef EXPERIMENTAL_DANE
1817 dane ||
1818 # endif
1819 verify_check_given_host(&ob->hosts_require_tls, host) == OK
1820 )
1821 {
1822 save_errno = ERRNO_TLSREQUIRED;
1823 message = string_sprintf("a TLS session is required, but %s",
1824 tls_offered? "an attempt to start TLS failed" :
1825 "the server did not offer TLS support");
1826 goto TLS_FAILED;
1827 }
1828 #endif /*SUPPORT_TLS*/
1829
1830 /* If TLS is active, we have just started it up and re-done the EHLO command,
1831 so its response needs to be analyzed. If TLS is not active and this is a
1832 continued session down a previously-used socket, we haven't just done EHLO, so
1833 we skip this. */
1834
1835 if (continue_hostname == NULL
1836 #ifdef SUPPORT_TLS
1837 || tls_out.active >= 0
1838 #endif
1839 )
1840 {
1841 /* Set for IGNOREQUOTA if the response to LHLO specifies support and the
1842 lmtp_ignore_quota option was set. */
1843
1844 igquotstr = (lmtp && ob->lmtp_ignore_quota &&
1845 pcre_exec(regex_IGNOREQUOTA, NULL, CS buffer, Ustrlen(CS buffer), 0,
1846 PCRE_EOPT, NULL, 0) >= 0)? US" IGNOREQUOTA" : US"";
1847
1848 /* If the response to EHLO specified support for the SIZE parameter, note
1849 this, provided size_addition is non-negative. */
1850
1851 smtp_use_size = esmtp && ob->size_addition >= 0 &&
1852 pcre_exec(regex_SIZE, NULL, CS buffer, Ustrlen(CS buffer), 0,
1853 PCRE_EOPT, NULL, 0) >= 0;
1854
1855 /* Note whether the server supports PIPELINING. If hosts_avoid_esmtp matched
1856 the current host, esmtp will be false, so PIPELINING can never be used. If
1857 the current host matches hosts_avoid_pipelining, don't do it. */
1858
1859 smtp_use_pipelining = esmtp
1860 && verify_check_given_host(&ob->hosts_avoid_pipelining, host) != OK
1861 && pcre_exec(regex_PIPELINING, NULL, CS buffer, Ustrlen(CS buffer), 0,
1862 PCRE_EOPT, NULL, 0) >= 0;
1863
1864 DEBUG(D_transport) debug_printf("%susing PIPELINING\n",
1865 smtp_use_pipelining? "" : "not ");
1866
1867 #ifndef DISABLE_PRDR
1868 prdr_offered = esmtp
1869 && pcre_exec(regex_PRDR, NULL, CS buffer, Ustrlen(CS buffer), 0,
1870 PCRE_EOPT, NULL, 0) >= 0
1871 && verify_check_given_host(&ob->hosts_try_prdr, host) == OK;
1872
1873 if (prdr_offered)
1874 {DEBUG(D_transport) debug_printf("PRDR usable\n");}
1875 #endif
1876
1877 #ifdef EXPERIMENTAL_INTERNATIONAL
1878 if (addrlist->prop.utf8_msg)
1879 utf8_offered = esmtp
1880 && pcre_exec(regex_UTF8, NULL, CS buffer, Ustrlen(buffer), 0,
1881 PCRE_EOPT, NULL, 0) >= 0;
1882 #endif
1883
1884 /* Note if the server supports DSN */
1885 smtp_use_dsn = esmtp
1886 && pcre_exec(regex_DSN, NULL, CS buffer, Ustrlen(CS buffer), 0,
1887 PCRE_EOPT, NULL, 0) >= 0;
1888 DEBUG(D_transport) debug_printf("use_dsn=%d\n", smtp_use_dsn);
1889
1890 /* Note if the response to EHLO specifies support for the AUTH extension.
1891 If it has, check that this host is one we want to authenticate to, and do
1892 the business. The host name and address must be available when the
1893 authenticator's client driver is running. */
1894
1895 switch (yield = smtp_auth(buffer, sizeof(buffer), addrlist, host,
1896 ob, esmtp, &inblock, &outblock))
1897 {
1898 default: goto SEND_QUIT;
1899 case OK: break;
1900 case FAIL_SEND: goto SEND_FAILED;
1901 case FAIL: goto RESPONSE_FAILED;
1902 }
1903 }
1904
1905 /* The setting up of the SMTP call is now complete. Any subsequent errors are
1906 message-specific. */
1907
1908 setting_up = FALSE;
1909
1910 #ifdef EXPERIMENTAL_INTERNATIONAL
1911 /* If this is an international message we need the host to speak SMTPUTF8 */
1912 if (utf8_needed && !utf8_offered)
1913 {
1914 errno = ERRNO_UTF8_FWD;
1915 goto RESPONSE_FAILED;
1916 }
1917 #endif
1918
1919 /* If there is a filter command specified for this transport, we can now
1920 set it up. This cannot be done until the identify of the host is known. */
1921
1922 if (tblock->filter_command != NULL)
1923 {
1924 BOOL rc;
1925 uschar buffer[64];
1926 sprintf(CS buffer, "%.50s transport", tblock->name);
1927 rc = transport_set_up_command(&transport_filter_argv, tblock->filter_command,
1928 TRUE, DEFER, addrlist, buffer, NULL);
1929 transport_filter_timeout = tblock->filter_timeout;
1930
1931 /* On failure, copy the error to all addresses, abandon the SMTP call, and
1932 yield ERROR. */
1933
1934 if (!rc)
1935 {
1936 set_errno(addrlist->next, addrlist->basic_errno, addrlist->message, DEFER,
1937 FALSE, NULL);
1938 yield = ERROR;
1939 goto SEND_QUIT;
1940 }
1941 }
1942
1943
1944 /* For messages that have more than the maximum number of envelope recipients,
1945 we want to send several transactions down the same SMTP connection. (See
1946 comments in deliver.c as to how this reconciles, heuristically, with
1947 remote_max_parallel.) This optimization was added to Exim after the following
1948 code was already working. The simplest way to put it in without disturbing the
1949 code was to use a goto to jump back to this point when there is another
1950 transaction to handle. */
1951
1952 SEND_MESSAGE:
1953 sync_addr = first_addr;
1954 address_count = 0;
1955 ok = FALSE;
1956 send_rset = TRUE;
1957 completed_address = FALSE;
1958
1959
1960 /* Initiate a message transfer. If we know the receiving MTA supports the SIZE
1961 qualification, send it, adding something to the message size to allow for
1962 imprecision and things that get added en route. Exim keeps the number of lines
1963 in a message, so we can give an accurate value for the original message, but we
1964 need some additional to handle added headers. (Double "." characters don't get
1965 included in the count.) */
1966
1967 p = buffer;
1968 *p = 0;
1969
1970 if (smtp_use_size)
1971 {
1972 sprintf(CS p, " SIZE=%d", message_size+message_linecount+ob->size_addition);
1973 while (*p) p++;
1974 }
1975
1976 #ifndef DISABLE_PRDR
1977 prdr_active = FALSE;
1978 if (prdr_offered)
1979 {
1980 for (addr = first_addr; addr; addr = addr->next)
1981 if (addr->transport_return == PENDING_DEFER)
1982 {
1983 for (addr = addr->next; addr; addr = addr->next)
1984 if (addr->transport_return == PENDING_DEFER)
1985 { /* at least two recipients to send */
1986 prdr_active = TRUE;
1987 sprintf(CS p, " PRDR"); p += 5;
1988 break;
1989 }
1990 break;
1991 }
1992 }
1993 #endif
1994
1995 #ifdef EXPERIMENTAL_INTERNATIONAL
1996 if (addrlist->prop.utf8_msg && !addrlist->prop.utf8_downcvt && utf8_offered)
1997 sprintf(CS p, " SMTPUTF8"), p += 9;
1998 #endif
1999
2000 /* check if all addresses have lasthop flag */
2001 /* do not send RET and ENVID if true */
2002 for (dsn_all_lasthop = TRUE, addr = first_addr;
2003 address_count < max_rcpt && addr != NULL;
2004 addr = addr->next)
2005 if ((addr->dsn_flags & rf_dsnlasthop) != 1)
2006 {
2007 dsn_all_lasthop = FALSE;
2008 break;
2009 }
2010
2011 /* Add any DSN flags to the mail command */
2012
2013 if (smtp_use_dsn && !dsn_all_lasthop)
2014 {
2015 if (dsn_ret == dsn_ret_hdrs)
2016 {
2017 Ustrcpy(p, " RET=HDRS");
2018 while (*p) p++;
2019 }
2020 else if (dsn_ret == dsn_ret_full)
2021 {
2022 Ustrcpy(p, " RET=FULL");
2023 while (*p) p++;
2024 }
2025 if (dsn_envid != NULL)
2026 {
2027 string_format(p, sizeof(buffer) - (p-buffer), " ENVID=%s", dsn_envid);
2028 while (*p) p++;
2029 }
2030 }
2031
2032 /* If an authenticated_sender override has been specified for this transport
2033 instance, expand it. If the expansion is forced to fail, and there was already
2034 an authenticated_sender for this message, the original value will be used.
2035 Other expansion failures are serious. An empty result is ignored, but there is
2036 otherwise no check - this feature is expected to be used with LMTP and other
2037 cases where non-standard addresses (e.g. without domains) might be required. */
2038
2039 if (smtp_mail_auth_str(p, sizeof(buffer) - (p-buffer), addrlist, ob))
2040 {
2041 yield = ERROR;
2042 goto SEND_QUIT;
2043 }
2044
2045 /* From here until we send the DATA command, we can make use of PIPELINING
2046 if the server host supports it. The code has to be able to check the responses
2047 at any point, for when the buffer fills up, so we write it totally generally.
2048 When PIPELINING is off, each command written reports that it has flushed the
2049 buffer. */
2050
2051 pending_MAIL = TRUE; /* The block starts with MAIL */
2052
2053 {
2054 uschar * s = return_path;
2055 #ifdef EXPERIMENTAL_INTERNATIONAL
2056 uschar * errstr = NULL;
2057
2058 /* If we must downconvert, do the from-address here. Remember we had to
2059 for the to-addresses (done below), and also (ugly) for re-doing when building
2060 the delivery log line. */
2061
2062 if (addrlist->prop.utf8_msg && (addrlist->prop.utf8_downcvt || !utf8_offered))
2063 {
2064 if (s = string_address_utf8_to_alabel(return_path, &errstr), errstr)
2065 {
2066 set_errno(addrlist, ERRNO_EXPANDFAIL, errstr, DEFER, FALSE, NULL);
2067 yield = ERROR;
2068 goto SEND_QUIT;
2069 }
2070 setflag(addrlist, af_utf8_downcvt);
2071 }
2072 #endif
2073
2074 rc = smtp_write_command(&outblock, smtp_use_pipelining,
2075 "MAIL FROM:<%s>%s\r\n", s, buffer);
2076 }
2077
2078 mail_command = string_copy(big_buffer); /* Save for later error message */
2079
2080 switch(rc)
2081 {
2082 case -1: /* Transmission error */
2083 goto SEND_FAILED;
2084
2085 case +1: /* Block was sent */
2086 if (!smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
2087 ob->command_timeout))
2088 {
2089 if (errno == 0 && buffer[0] == '4')
2090 {
2091 errno = ERRNO_MAIL4XX;
2092 addrlist->more_errno |= ((buffer[1] - '0')*10 + buffer[2] - '0') << 8;
2093 }
2094 goto RESPONSE_FAILED;
2095 }
2096 pending_MAIL = FALSE;
2097 break;
2098 }
2099
2100 /* Pass over all the relevant recipient addresses for this host, which are the
2101 ones that have status PENDING_DEFER. If we are using PIPELINING, we can send
2102 several before we have to read the responses for those seen so far. This
2103 checking is done by a subroutine because it also needs to be done at the end.
2104 Send only up to max_rcpt addresses at a time, leaving first_addr pointing to
2105 the next one if not all are sent.
2106
2107 In the MUA wrapper situation, we want to flush the PIPELINING buffer for the
2108 last address because we want to abort if any recipients have any kind of
2109 problem, temporary or permanent. We know that all recipient addresses will have
2110 the PENDING_DEFER status, because only one attempt is ever made, and we know
2111 that max_rcpt will be large, so all addresses will be done at once. */
2112
2113 for (addr = first_addr;
2114 address_count < max_rcpt && addr != NULL;
2115 addr = addr->next)
2116 {
2117 int count;
2118 BOOL no_flush;
2119 uschar * rcpt_addr;
2120
2121 addr->dsn_aware = smtp_use_dsn ? dsn_support_yes : dsn_support_no;
2122
2123 if (addr->transport_return != PENDING_DEFER) continue;
2124
2125 address_count++;
2126 no_flush = smtp_use_pipelining && (!mua_wrapper || addr->next != NULL);
2127
2128 /* Add any DSN flags to the rcpt command and add to the sent string */
2129
2130 p = buffer;
2131 *p = 0;
2132
2133 if (smtp_use_dsn && (addr->dsn_flags & rf_dsnlasthop) != 1)
2134 {
2135 if ((addr->dsn_flags & rf_dsnflags) != 0)
2136 {
2137 int i;
2138 BOOL first = TRUE;
2139 Ustrcpy(p, " NOTIFY=");
2140 while (*p) p++;
2141 for (i = 0; i < 4; i++)
2142 if ((addr->dsn_flags & rf_list[i]) != 0)
2143 {
2144 if (!first) *p++ = ',';
2145 first = FALSE;
2146 Ustrcpy(p, rf_names[i]);
2147 while (*p) p++;
2148 }
2149 }
2150
2151 if (addr->dsn_orcpt != NULL)
2152 {
2153 string_format(p, sizeof(buffer) - (p-buffer), " ORCPT=%s",
2154 addr->dsn_orcpt);
2155 while (*p) p++;
2156 }
2157 }
2158
2159 /* Now send the RCPT command, and process outstanding responses when
2160 necessary. After a timeout on RCPT, we just end the function, leaving the
2161 yield as OK, because this error can often mean that there is a problem with
2162 just one address, so we don't want to delay the host. */
2163
2164 rcpt_addr = transport_rcpt_address(addr, tblock->rcpt_include_affixes);
2165
2166 #ifdef EXPERIMENTAL_INTERNATIONAL
2167 {
2168 uschar * dummy_errstr;
2169 if ( testflag(addrlist, af_utf8_downcvt)
2170 && (rcpt_addr = string_address_utf8_to_alabel(rcpt_addr, &dummy_errstr),
2171 dummy_errstr
2172 ) )
2173 {
2174 errno = ERRNO_EXPANDFAIL;
2175 goto SEND_FAILED;
2176 }
2177 }
2178 #endif
2179
2180 count = smtp_write_command(&outblock, no_flush, "RCPT TO:<%s>%s%s\r\n",
2181 rcpt_addr, igquotstr, buffer);
2182
2183 if (count < 0) goto SEND_FAILED;
2184 if (count > 0)
2185 {
2186 switch(sync_responses(first_addr, tblock->rcpt_include_affixes,
2187 &sync_addr, host, count, ob->address_retry_include_sender,
2188 pending_MAIL, 0, &inblock, ob->command_timeout, buffer,
2189 sizeof(buffer)))
2190 {
2191 case 3: ok = TRUE; /* 2xx & 5xx => OK & progress made */
2192 case 2: completed_address = TRUE; /* 5xx (only) => progress made */
2193 break;
2194
2195 case 1: ok = TRUE; /* 2xx (only) => OK, but if LMTP, */
2196 if (!lmtp) completed_address = TRUE; /* can't tell about progress yet */
2197 case 0: /* No 2xx or 5xx, but no probs */
2198 break;
2199
2200 case -1: goto END_OFF; /* Timeout on RCPT */
2201 default: goto RESPONSE_FAILED; /* I/O error, or any MAIL error */
2202 }
2203 pending_MAIL = FALSE; /* Dealt with MAIL */
2204 }
2205 } /* Loop for next address */
2206
2207 /* If we are an MUA wrapper, abort if any RCPTs were rejected, either
2208 permanently or temporarily. We should have flushed and synced after the last
2209 RCPT. */
2210
2211 if (mua_wrapper)
2212 {
2213 address_item *badaddr;
2214 for (badaddr = first_addr; badaddr; badaddr = badaddr->next)
2215 if (badaddr->transport_return != PENDING_OK)
2216 {
2217 /*XXX could we find a better errno than 0 here? */
2218 set_errno(addrlist, 0, badaddr->message, FAIL,
2219 testflag(badaddr, af_pass_message), NULL);
2220 ok = FALSE;
2221 break;
2222 }
2223 }
2224
2225 /* If ok is TRUE, we know we have got at least one good recipient, and must now
2226 send DATA, but if it is FALSE (in the normal, non-wrapper case), we may still
2227 have a good recipient buffered up if we are pipelining. We don't want to waste
2228 time sending DATA needlessly, so we only send it if either ok is TRUE or if we
2229 are pipelining. The responses are all handled by sync_responses(). */
2230
2231 if (ok || (smtp_use_pipelining && !mua_wrapper))
2232 {
2233 int count = smtp_write_command(&outblock, FALSE, "DATA\r\n");
2234 if (count < 0) goto SEND_FAILED;
2235 switch(sync_responses(first_addr, tblock->rcpt_include_affixes, &sync_addr,
2236 host, count, ob->address_retry_include_sender, pending_MAIL,
2237 ok? +1 : -1, &inblock, ob->command_timeout, buffer, sizeof(buffer)))
2238 {
2239 case 3: ok = TRUE; /* 2xx & 5xx => OK & progress made */
2240 case 2: completed_address = TRUE; /* 5xx (only) => progress made */
2241 break;
2242
2243 case 1: ok = TRUE; /* 2xx (only) => OK, but if LMTP, */
2244 if (!lmtp) completed_address = TRUE; /* can't tell about progress yet */
2245 case 0: break; /* No 2xx or 5xx, but no probs */
2246
2247 case -1: goto END_OFF; /* Timeout on RCPT */
2248 default: goto RESPONSE_FAILED; /* I/O error, or any MAIL/DATA error */
2249 }
2250 }
2251
2252 /* Save the first address of the next batch. */
2253
2254 first_addr = addr;
2255
2256 /* If there were no good recipients (but otherwise there have been no
2257 problems), just set ok TRUE, since we have handled address-specific errors
2258 already. Otherwise, it's OK to send the message. Use the check/escape mechanism
2259 for handling the SMTP dot-handling protocol, flagging to apply to headers as
2260 well as body. Set the appropriate timeout value to be used for each chunk.
2261 (Haven't been able to make it work using select() for writing yet.) */
2262
2263 if (!ok) ok = TRUE; else
2264 {
2265 sigalrm_seen = FALSE;
2266 transport_write_timeout = ob->data_timeout;
2267 smtp_command = US"sending data block"; /* For error messages */
2268 DEBUG(D_transport|D_v)
2269 debug_printf(" SMTP>> writing message and terminating \".\"\n");
2270 transport_count = 0;
2271
2272 #ifndef DISABLE_DKIM
2273 ok = dkim_transport_write_message(addrlist, inblock.sock,
2274 topt_use_crlf | topt_end_dot | topt_escape_headers |
2275 (tblock->body_only? topt_no_headers : 0) |
2276 (tblock->headers_only? topt_no_body : 0) |
2277 (tblock->return_path_add? topt_add_return_path : 0) |
2278 (tblock->delivery_date_add? topt_add_delivery_date : 0) |
2279 (tblock->envelope_to_add? topt_add_envelope_to : 0),
2280 0, /* No size limit */
2281 tblock->add_headers, tblock->remove_headers,
2282 US".", US"..", /* Escaping strings */
2283 tblock->rewrite_rules, tblock->rewrite_existflags,
2284 ob->dkim_private_key, ob->dkim_domain, ob->dkim_selector,
2285 ob->dkim_canon, ob->dkim_strict, ob->dkim_sign_headers
2286 );
2287 #else
2288 ok = transport_write_message(addrlist, inblock.sock,
2289 topt_use_crlf | topt_end_dot | topt_escape_headers |
2290 (tblock->body_only? topt_no_headers : 0) |
2291 (tblock->headers_only? topt_no_body : 0) |
2292 (tblock->return_path_add? topt_add_return_path : 0) |
2293 (tblock->delivery_date_add? topt_add_delivery_date : 0) |
2294 (tblock->envelope_to_add? topt_add_envelope_to : 0),
2295 0, /* No size limit */
2296 tblock->add_headers, tblock->remove_headers,
2297 US".", US"..", /* Escaping strings */
2298 tblock->rewrite_rules, tblock->rewrite_existflags);
2299 #endif
2300
2301 /* transport_write_message() uses write() because it is called from other
2302 places to write to non-sockets. This means that under some OS (e.g. Solaris)
2303 it can exit with "Broken pipe" as its error. This really means that the
2304 socket got closed at the far end. */
2305
2306 transport_write_timeout = 0; /* for subsequent transports */
2307
2308 /* Failure can either be some kind of I/O disaster (including timeout),
2309 or the failure of a transport filter or the expansion of added headers. */
2310
2311 if (!ok)
2312 {
2313 buffer[0] = 0; /* There hasn't been a response */
2314 goto RESPONSE_FAILED;
2315 }
2316
2317 /* We used to send the terminating "." explicitly here, but because of
2318 buffering effects at both ends of TCP/IP connections, you don't gain
2319 anything by keeping it separate, so it might as well go in the final
2320 data buffer for efficiency. This is now done by setting the topt_end_dot
2321 flag above. */
2322
2323 smtp_command = US"end of data";
2324
2325 #ifndef DISABLE_PRDR
2326 /* For PRDR we optionally get a partial-responses warning
2327 * followed by the individual responses, before going on with
2328 * the overall response. If we don't get the warning then deal
2329 * with per non-PRDR. */
2330 if(prdr_active)
2331 {
2332 ok = smtp_read_response(&inblock, buffer, sizeof(buffer), '3',
2333 ob->final_timeout);
2334 if (!ok && errno == 0)
2335 switch(buffer[0])
2336 {
2337 case '2': prdr_active = FALSE;
2338 ok = TRUE;
2339 break;
2340 case '4': errno = ERRNO_DATA4XX;
2341 addrlist->more_errno |= ((buffer[1] - '0')*10 + buffer[2] - '0') << 8;
2342 break;
2343 }
2344 }
2345 else
2346 #endif
2347
2348 /* For non-PRDR SMTP, we now read a single response that applies to the
2349 whole message. If it is OK, then all the addresses have been delivered. */
2350
2351 if (!lmtp)
2352 {
2353 ok = smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
2354 ob->final_timeout);
2355 if (!ok && errno == 0 && buffer[0] == '4')
2356 {
2357 errno = ERRNO_DATA4XX;
2358 addrlist->more_errno |= ((buffer[1] - '0')*10 + buffer[2] - '0') << 8;
2359 }
2360 }
2361
2362 /* For LMTP, we get back a response for every RCPT command that we sent;
2363 some may be accepted and some rejected. For those that get a response, their
2364 status is fixed; any that are accepted have been handed over, even if later
2365 responses crash - at least, that's how I read RFC 2033.
2366
2367 If all went well, mark the recipient addresses as completed, record which
2368 host/IPaddress they were delivered to, and cut out RSET when sending another
2369 message down the same channel. Write the completed addresses to the journal
2370 now so that they are recorded in case there is a crash of hardware or
2371 software before the spool gets updated. Also record the final SMTP
2372 confirmation if needed (for SMTP only). */
2373
2374 if (ok)
2375 {
2376 int flag = '=';
2377 int delivery_time = (int)(time(NULL) - start_delivery_time);
2378 int len;
2379 uschar *conf = NULL;
2380 send_rset = FALSE;
2381
2382 /* Set up confirmation if needed - applies only to SMTP */
2383
2384 if (
2385 #ifndef EXPERIMENTAL_EVENT
2386 (log_extra_selector & LX_smtp_confirmation) != 0 &&
2387 #endif
2388 !lmtp
2389 )
2390 {
2391 const uschar *s = string_printing(buffer);
2392 /* deconst cast ok here as string_printing was checked to have alloc'n'copied */
2393 conf = (s == buffer)? (uschar *)string_copy(s) : US s;
2394 }
2395
2396 /* Process all transported addresses - for LMTP or PRDR, read a status for
2397 each one. */
2398
2399 for (addr = addrlist; addr != first_addr; addr = addr->next)
2400 {
2401 if (addr->transport_return != PENDING_OK) continue;
2402
2403 /* LMTP - if the response fails badly (e.g. timeout), use it for all the
2404 remaining addresses. Otherwise, it's a return code for just the one
2405 address. For temporary errors, add a retry item for the address so that
2406 it doesn't get tried again too soon. */
2407
2408 #ifndef DISABLE_PRDR
2409 if (lmtp || prdr_active)
2410 #else
2411 if (lmtp)
2412 #endif
2413 {
2414 if (!smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
2415 ob->final_timeout))
2416 {
2417 if (errno != 0 || buffer[0] == 0) goto RESPONSE_FAILED;
2418 addr->message = string_sprintf(
2419 #ifndef DISABLE_PRDR
2420 "%s error after %s: %s", prdr_active ? "PRDR":"LMTP",
2421 #else
2422 "LMTP error after %s: %s",
2423 #endif
2424 big_buffer, string_printing(buffer));
2425 setflag(addr, af_pass_message); /* Allow message to go to user */
2426 if (buffer[0] == '5')
2427 addr->transport_return = FAIL;
2428 else
2429 {
2430 errno = ERRNO_DATA4XX;
2431 addr->more_errno |= ((buffer[1] - '0')*10 + buffer[2] - '0') << 8;
2432 addr->transport_return = DEFER;
2433 #ifndef DISABLE_PRDR
2434 if (!prdr_active)
2435 #endif
2436 retry_add_item(addr, addr->address_retry_key, 0);
2437 }
2438 continue;
2439 }
2440 completed_address = TRUE; /* NOW we can set this flag */
2441 if ((log_extra_selector & LX_smtp_confirmation) != 0)
2442 {
2443 const uschar *s = string_printing(buffer);
2444 /* deconst cast ok here as string_printing was checked to have alloc'n'copied */
2445 conf = (s == buffer)? (uschar *)string_copy(s) : US s;
2446 }
2447 }
2448
2449 /* SMTP, or success return from LMTP for this address. Pass back the
2450 actual host that was used. */
2451
2452 addr->transport_return = OK;
2453 addr->more_errno = delivery_time;
2454 addr->host_used = host;
2455 addr->special_action = flag;
2456 addr->message = conf;
2457 #ifndef DISABLE_PRDR
2458 if (prdr_active) addr->flags |= af_prdr_used;
2459 #endif
2460 flag = '-';
2461
2462 #ifndef DISABLE_PRDR
2463 if (!prdr_active)
2464 #endif
2465 {
2466 /* Update the journal. For homonymic addresses, use the base address plus
2467 the transport name. See lots of comments in deliver.c about the reasons
2468 for the complications when homonyms are involved. Just carry on after
2469 write error, as it may prove possible to update the spool file later. */
2470
2471 if (testflag(addr, af_homonym))
2472 sprintf(CS buffer, "%.500s/%s\n", addr->unique + 3, tblock->name);
2473 else
2474 sprintf(CS buffer, "%.500s\n", addr->unique);
2475
2476 DEBUG(D_deliver) debug_printf("journalling %s", buffer);
2477 len = Ustrlen(CS buffer);
2478 if (write(journal_fd, buffer, len) != len)
2479 log_write(0, LOG_MAIN|LOG_PANIC, "failed to write journal for "
2480 "%s: %s", buffer, strerror(errno));
2481 }
2482 }
2483
2484 #ifndef DISABLE_PRDR
2485 if (prdr_active)
2486 {
2487 /* PRDR - get the final, overall response. For any non-success
2488 upgrade all the address statuses. */
2489 ok = smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
2490 ob->final_timeout);
2491 if (!ok)
2492 {
2493 if(errno == 0 && buffer[0] == '4')
2494 {
2495 errno = ERRNO_DATA4XX;
2496 addrlist->more_errno |= ((buffer[1] - '0')*10 + buffer[2] - '0') << 8;
2497 }
2498 for (addr = addrlist; addr != first_addr; addr = addr->next)
2499 if (buffer[0] == '5' || addr->transport_return == OK)
2500 addr->transport_return = PENDING_OK; /* allow set_errno action */
2501 goto RESPONSE_FAILED;
2502 }
2503
2504 /* Update the journal, or setup retry. */
2505 for (addr = addrlist; addr != first_addr; addr = addr->next)
2506 if (addr->transport_return == OK)
2507 {
2508 if (testflag(addr, af_homonym))
2509 sprintf(CS buffer, "%.500s/%s\n", addr->unique + 3, tblock->name);
2510 else
2511 sprintf(CS buffer, "%.500s\n", addr->unique);
2512
2513 DEBUG(D_deliver) debug_printf("journalling(PRDR) %s", buffer);
2514 len = Ustrlen(CS buffer);
2515 if (write(journal_fd, buffer, len) != len)
2516 log_write(0, LOG_MAIN|LOG_PANIC, "failed to write journal for "
2517 "%s: %s", buffer, strerror(errno));
2518 }
2519 else if (addr->transport_return == DEFER)
2520 retry_add_item(addr, addr->address_retry_key, -2);
2521 }
2522 #endif
2523
2524 /* Ensure the journal file is pushed out to disk. */
2525
2526 if (EXIMfsync(journal_fd) < 0)
2527 log_write(0, LOG_MAIN|LOG_PANIC, "failed to fsync journal: %s",
2528 strerror(errno));
2529 }
2530 }
2531
2532
2533 /* Handle general (not specific to one address) failures here. The value of ok
2534 is used to skip over this code on the falling through case. A timeout causes a
2535 deferral. Other errors may defer or fail according to the response code, and
2536 may set up a special errno value, e.g. after connection chopped, which is
2537 assumed if errno == 0 and there is no text in the buffer. If control reaches
2538 here during the setting up phase (i.e. before MAIL FROM) then always defer, as
2539 the problem is not related to this specific message. */
2540
2541 if (!ok)
2542 {
2543 int code;
2544
2545 RESPONSE_FAILED:
2546 save_errno = errno;
2547 message = NULL;
2548 send_quit = check_response(host, &save_errno, addrlist->more_errno,
2549 buffer, &code, &message, &pass_message);
2550 goto FAILED;
2551
2552 SEND_FAILED:
2553 save_errno = errno;
2554 code = '4';
2555 message = US string_sprintf("send() to %s [%s] failed: %s",
2556 host->name, host->address, strerror(save_errno));
2557 send_quit = FALSE;
2558 goto FAILED;
2559
2560 /* This label is jumped to directly when a TLS negotiation has failed,
2561 or was not done for a host for which it is required. Values will be set
2562 in message and save_errno, and setting_up will always be true. Treat as
2563 a temporary error. */
2564
2565 #ifdef SUPPORT_TLS
2566 TLS_FAILED:
2567 code = '4';
2568 #endif
2569
2570 /* If the failure happened while setting up the call, see if the failure was
2571 a 5xx response (this will either be on connection, or following HELO - a 5xx
2572 after EHLO causes it to try HELO). If so, fail all addresses, as this host is
2573 never going to accept them. For other errors during setting up (timeouts or
2574 whatever), defer all addresses, and yield DEFER, so that the host is not
2575 tried again for a while. */
2576
2577 FAILED:
2578 ok = FALSE; /* For when reached by GOTO */
2579
2580 if (setting_up)
2581 {
2582 if (code == '5')
2583 set_errno(addrlist, save_errno, message, FAIL, pass_message, host);
2584 else
2585 {
2586 set_errno(addrlist, save_errno, message, DEFER, pass_message, host);
2587 yield = DEFER;
2588 }
2589 }
2590
2591 /* We want to handle timeouts after MAIL or "." and loss of connection after
2592 "." specially. They can indicate a problem with the sender address or with
2593 the contents of the message rather than a real error on the connection. These
2594 cases are treated in the same way as a 4xx response. This next bit of code
2595 does the classification. */
2596
2597 else
2598 {
2599 BOOL message_error;
2600
2601 switch(save_errno)
2602 {
2603 #ifdef EXPERIMENTAL_INTERNATIONAL
2604 case ERRNO_UTF8_FWD:
2605 code = '5';
2606 /*FALLTHROUGH*/
2607 #endif
2608 case 0:
2609 case ERRNO_MAIL4XX:
2610 case ERRNO_DATA4XX:
2611 message_error = TRUE;
2612 break;
2613
2614 case ETIMEDOUT:
2615 message_error = Ustrncmp(smtp_command,"MAIL",4) == 0 ||
2616 Ustrncmp(smtp_command,"end ",4) == 0;
2617 break;
2618
2619 case ERRNO_SMTPCLOSED:
2620 message_error = Ustrncmp(smtp_command,"end ",4) == 0;
2621 break;
2622
2623 default:
2624 message_error = FALSE;
2625 break;
2626 }
2627
2628 /* Handle the cases that are treated as message errors. These are:
2629
2630 (a) negative response or timeout after MAIL
2631 (b) negative response after DATA
2632 (c) negative response or timeout or dropped connection after "."
2633 (d) utf8 support required and not offered
2634
2635 It won't be a negative response or timeout after RCPT, as that is dealt
2636 with separately above. The action in all cases is to set an appropriate
2637 error code for all the addresses, but to leave yield set to OK because the
2638 host itself has not failed. Of course, it might in practice have failed
2639 when we've had a timeout, but if so, we'll discover that at the next
2640 delivery attempt. For a temporary error, set the message_defer flag, and
2641 write to the logs for information if this is not the last host. The error
2642 for the last host will be logged as part of the address's log line. */
2643
2644 if (message_error)
2645 {
2646 if (mua_wrapper) code = '5'; /* Force hard failure in wrapper mode */
2647 set_errno(addrlist, save_errno, message, (code == '5')? FAIL : DEFER,
2648 pass_message, host);
2649
2650 /* If there's an errno, the message contains just the identity of
2651 the host. */
2652
2653 if (code != '5') /* Anything other than 5 is treated as temporary */
2654 {
2655 if (save_errno > 0)
2656 message = US string_sprintf("%s: %s", message, strerror(save_errno));
2657 if (host->next != NULL) log_write(0, LOG_MAIN, "%s", message);
2658 msglog_line(host, message);
2659 *message_defer = TRUE;
2660 }
2661 }
2662
2663 /* Otherwise, we have an I/O error or a timeout other than after MAIL or
2664 ".", or some other transportation error. We defer all addresses and yield
2665 DEFER, except for the case of failed add_headers expansion, or a transport
2666 filter failure, when the yield should be ERROR, to stop it trying other
2667 hosts. */
2668
2669 else
2670 {
2671 yield = (save_errno == ERRNO_CHHEADER_FAIL ||
2672 save_errno == ERRNO_FILTER_FAIL)? ERROR : DEFER;
2673 set_errno(addrlist, save_errno, message, DEFER, pass_message, host);
2674 }
2675 }
2676 }
2677
2678
2679 /* If all has gone well, send_quit will be set TRUE, implying we can end the
2680 SMTP session tidily. However, if there were too many addresses to send in one
2681 message (indicated by first_addr being non-NULL) we want to carry on with the
2682 rest of them. Also, it is desirable to send more than one message down the SMTP
2683 connection if there are several waiting, provided we haven't already sent so
2684 many as to hit the configured limit. The function transport_check_waiting looks
2685 for a waiting message and returns its id. Then transport_pass_socket tries to
2686 set up a continued delivery by passing the socket on to another process. The
2687 variable send_rset is FALSE if a message has just been successfully transfered.
2688
2689 If we are already sending down a continued channel, there may be further
2690 addresses not yet delivered that are aimed at the same host, but which have not
2691 been passed in this run of the transport. In this case, continue_more will be
2692 true, and all we should do is send RSET if necessary, and return, leaving the
2693 channel open.
2694
2695 However, if no address was disposed of, i.e. all addresses got 4xx errors, we
2696 do not want to continue with other messages down the same channel, because that
2697 can lead to looping between two or more messages, all with the same,
2698 temporarily failing address(es). [The retry information isn't updated yet, so
2699 new processes keep on trying.] We probably also don't want to try more of this
2700 message's addresses either.
2701
2702 If we have started a TLS session, we have to end it before passing the
2703 connection to a new process. However, not all servers can handle this (Exim
2704 can), so we do not pass such a connection on if the host matches
2705 hosts_nopass_tls. */
2706
2707 DEBUG(D_transport)
2708 debug_printf("ok=%d send_quit=%d send_rset=%d continue_more=%d "
2709 "yield=%d first_address is %sNULL\n", ok, send_quit, send_rset,
2710 continue_more, yield, (first_addr == NULL)? "":"not ");
2711
2712 if (completed_address && ok && send_quit)
2713 {
2714 BOOL more;
2715 smtp_compare_t t_compare;
2716
2717 t_compare.tblock = tblock;
2718 t_compare.current_sender_address = sender_address;
2719
2720 if ( first_addr != NULL
2721 || continue_more
2722 || ( ( tls_out.active < 0
2723 || verify_check_given_host(&ob->hosts_nopass_tls, host) != OK
2724 )
2725 &&
2726 transport_check_waiting(tblock->name, host->name,
2727 tblock->connection_max_messages, new_message_id, &more,
2728 (oicf)smtp_are_same_identities, (void*)&t_compare)
2729 ) )
2730 {
2731 uschar *msg;
2732 BOOL pass_message;
2733
2734 if (send_rset)
2735 {
2736 if (! (ok = smtp_write_command(&outblock, FALSE, "RSET\r\n") >= 0))
2737 {
2738 msg = US string_sprintf("send() to %s [%s] failed: %s", host->name,
2739 host->address, strerror(save_errno));
2740 send_quit = FALSE;
2741 }
2742 else if (! (ok = smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
2743 ob->command_timeout)))
2744 {
2745 int code;
2746 send_quit = check_response(host, &errno, 0, buffer, &code, &msg,
2747 &pass_message);
2748 if (!send_quit)
2749 {
2750 DEBUG(D_transport) debug_printf("H=%s [%s] %s\n",
2751 host->name, host->address, msg);
2752 }
2753 }
2754 }
2755
2756 /* Either RSET was not needed, or it succeeded */
2757
2758 if (ok)
2759 {
2760 if (first_addr != NULL) /* More addresses still to be sent */
2761 { /* in this run of the transport */
2762 continue_sequence++; /* Causes * in logging */
2763 goto SEND_MESSAGE;
2764 }
2765 if (continue_more) return yield; /* More addresses for another run */
2766
2767 /* Pass the socket to a new Exim process. Before doing so, we must shut
2768 down TLS. Not all MTAs allow for the continuation of the SMTP session
2769 when TLS is shut down. We test for this by sending a new EHLO. If we
2770 don't get a good response, we don't attempt to pass the socket on. */
2771
2772 #ifdef SUPPORT_TLS
2773 if (tls_out.active >= 0)
2774 {
2775 tls_close(FALSE, TRUE);
2776 if (smtps)
2777 ok = FALSE;
2778 else
2779 ok = smtp_write_command(&outblock,FALSE,"EHLO %s\r\n",helo_data) >= 0 &&
2780 smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
2781 ob->command_timeout);
2782 }
2783 #endif
2784
2785 /* If the socket is successfully passed, we musn't send QUIT (or
2786 indeed anything!) from here. */
2787
2788 if (ok && transport_pass_socket(tblock->name, host->name, host->address,
2789 new_message_id, inblock.sock))
2790 {
2791 send_quit = FALSE;
2792 }
2793 }
2794
2795 /* If RSET failed and there are addresses left, they get deferred. */
2796
2797 else set_errno(first_addr, errno, msg, DEFER, FALSE, host);
2798 }
2799 }
2800
2801 /* End off tidily with QUIT unless the connection has died or the socket has
2802 been passed to another process. There has been discussion on the net about what
2803 to do after sending QUIT. The wording of the RFC suggests that it is necessary
2804 to wait for a response, but on the other hand, there isn't anything one can do
2805 with an error response, other than log it. Exim used to do that. However,
2806 further discussion suggested that it is positively advantageous not to wait for
2807 the response, but to close the session immediately. This is supposed to move
2808 the TCP/IP TIME_WAIT state from the server to the client, thereby removing some
2809 load from the server. (Hosts that are both servers and clients may not see much
2810 difference, of course.) Further discussion indicated that this was safe to do
2811 on Unix systems which have decent implementations of TCP/IP that leave the
2812 connection around for a while (TIME_WAIT) after the application has gone away.
2813 This enables the response sent by the server to be properly ACKed rather than
2814 timed out, as can happen on broken TCP/IP implementations on other OS.
2815
2816 This change is being made on 31-Jul-98. After over a year of trouble-free
2817 operation, the old commented-out code was removed on 17-Sep-99. */
2818
2819 SEND_QUIT:
2820 if (send_quit) (void)smtp_write_command(&outblock, FALSE, "QUIT\r\n");
2821
2822 END_OFF:
2823
2824 #ifdef SUPPORT_TLS
2825 tls_close(FALSE, TRUE);
2826 #endif
2827
2828 /* Close the socket, and return the appropriate value, first setting
2829 works because the NULL setting is passed back to the calling process, and
2830 remote_max_parallel is forced to 1 when delivering over an existing connection,
2831
2832 If all went well and continue_more is set, we shouldn't actually get here if
2833 there are further addresses, as the return above will be taken. However,
2834 writing RSET might have failed, or there may be other addresses whose hosts are
2835 specified in the transports, and therefore not visible at top level, in which
2836 case continue_more won't get set. */
2837
2838 (void)close(inblock.sock);
2839
2840 #ifdef EXPERIMENTAL_EVENT
2841 (void) event_raise(tblock->event_action, US"tcp:close", NULL);
2842 #endif
2843
2844 continue_transport = NULL;
2845 continue_hostname = NULL;
2846 return yield;
2847 }
2848
2849
2850
2851
2852 /*************************************************
2853 * Closedown entry point *
2854 *************************************************/
2855
2856 /* This function is called when exim is passed an open smtp channel
2857 from another incarnation, but the message which it has been asked
2858 to deliver no longer exists. The channel is on stdin.
2859
2860 We might do fancy things like looking for another message to send down
2861 the channel, but if the one we sought has gone, it has probably been
2862 delivered by some other process that itself will seek further messages,
2863 so just close down our connection.
2864
2865 Argument: pointer to the transport instance block
2866 Returns: nothing
2867 */
2868
2869 void
2870 smtp_transport_closedown(transport_instance *tblock)
2871 {
2872 smtp_transport_options_block *ob =
2873 (smtp_transport_options_block *)(tblock->options_block);
2874 smtp_inblock inblock;
2875 smtp_outblock outblock;
2876 uschar buffer[256];
2877 uschar inbuffer[4096];
2878 uschar outbuffer[16];
2879
2880 inblock.sock = fileno(stdin);
2881 inblock.buffer = inbuffer;
2882 inblock.buffersize = sizeof(inbuffer);
2883 inblock.ptr = inbuffer;
2884 inblock.ptrend = inbuffer;
2885
2886 outblock.sock = inblock.sock;
2887 outblock.buffersize = sizeof(outbuffer);
2888 outblock.buffer = outbuffer;
2889 outblock.ptr = outbuffer;
2890 outblock.cmd_count = 0;
2891 outblock.authenticating = FALSE;
2892
2893 (void)smtp_write_command(&outblock, FALSE, "QUIT\r\n");
2894 (void)smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
2895 ob->command_timeout);
2896 (void)close(inblock.sock);
2897 }
2898
2899
2900
2901 /*************************************************
2902 * Prepare addresses for delivery *
2903 *************************************************/
2904
2905 /* This function is called to flush out error settings from previous delivery
2906 attempts to other hosts. It also records whether we got here via an MX record
2907 or not in the more_errno field of the address. We are interested only in
2908 addresses that are still marked DEFER - others may have got delivered to a
2909 previously considered IP address. Set their status to PENDING_DEFER to indicate
2910 which ones are relevant this time.
2911
2912 Arguments:
2913 addrlist the list of addresses
2914 host the host we are delivering to
2915
2916 Returns: the first address for this delivery
2917 */
2918
2919 static address_item *
2920 prepare_addresses(address_item *addrlist, host_item *host)
2921 {
2922 address_item *first_addr = NULL;
2923 address_item *addr;
2924 for (addr = addrlist; addr != NULL; addr = addr->next)
2925 if (addr->transport_return == DEFER)
2926 {
2927 if (first_addr == NULL) first_addr = addr;
2928 addr->transport_return = PENDING_DEFER;
2929 addr->basic_errno = 0;
2930 addr->more_errno = (host->mx >= 0)? 'M' : 'A';
2931 addr->message = NULL;
2932 #ifdef SUPPORT_TLS
2933 addr->cipher = NULL;
2934 addr->ourcert = NULL;
2935 addr->peercert = NULL;
2936 addr->peerdn = NULL;
2937 addr->ocsp = OCSP_NOT_REQ;
2938 #endif
2939 }
2940 return first_addr;
2941 }
2942
2943
2944
2945 /*************************************************
2946 * Main entry point *
2947 *************************************************/
2948
2949 /* See local README for interface details. As this is a remote transport, it is
2950 given a chain of addresses to be delivered in one connection, if possible. It
2951 always returns TRUE, indicating that each address has its own independent
2952 status set, except if there is a setting up problem, in which case it returns
2953 FALSE. */
2954
2955 BOOL
2956 smtp_transport_entry(
2957 transport_instance *tblock, /* data for this instantiation */
2958 address_item *addrlist) /* addresses we are working on */
2959 {
2960 int cutoff_retry;
2961 int port;
2962 int hosts_defer = 0;
2963 int hosts_fail = 0;
2964 int hosts_looked_up = 0;
2965 int hosts_retry = 0;
2966 int hosts_serial = 0;
2967 int hosts_total = 0;
2968 int total_hosts_tried = 0;
2969 address_item *addr;
2970 BOOL expired = TRUE;
2971 BOOL continuing = continue_hostname != NULL;
2972 uschar *expanded_hosts = NULL;
2973 uschar *pistring;
2974 uschar *tid = string_sprintf("%s transport", tblock->name);
2975 smtp_transport_options_block *ob =
2976 (smtp_transport_options_block *)(tblock->options_block);
2977 host_item *hostlist = addrlist->host_list;
2978 host_item *host = NULL;
2979
2980 DEBUG(D_transport)
2981 {
2982 debug_printf("%s transport entered\n", tblock->name);
2983 for (addr = addrlist; addr != NULL; addr = addr->next)
2984 debug_printf(" %s\n", addr->address);
2985 if (continuing) debug_printf("already connected to %s [%s]\n",
2986 continue_hostname, continue_host_address);
2987 }
2988
2989 /* Set the flag requesting that these hosts be added to the waiting
2990 database if the delivery fails temporarily or if we are running with
2991 queue_smtp or a 2-stage queue run. This gets unset for certain
2992 kinds of error, typically those that are specific to the message. */
2993
2994 update_waiting = TRUE;
2995
2996 /* If a host list is not defined for the addresses - they must all have the
2997 same one in order to be passed to a single transport - or if the transport has
2998 a host list with hosts_override set, use the host list supplied with the
2999 transport. It is an error for this not to exist. */
3000
3001 if (hostlist == NULL || (ob->hosts_override && ob->hosts != NULL))
3002 {
3003 if (ob->hosts == NULL)
3004 {
3005 addrlist->message = string_sprintf("%s transport called with no hosts set",
3006 tblock->name);
3007 addrlist->transport_return = PANIC;
3008 return FALSE; /* Only top address has status */
3009 }
3010
3011 DEBUG(D_transport) debug_printf("using the transport's hosts: %s\n",
3012 ob->hosts);
3013
3014 /* If the transport's host list contains no '$' characters, and we are not
3015 randomizing, it is fixed and therefore a chain of hosts can be built once
3016 and for all, and remembered for subsequent use by other calls to this
3017 transport. If, on the other hand, the host list does contain '$', or we are
3018 randomizing its order, we have to rebuild it each time. In the fixed case,
3019 as the hosts string will never be used again, it doesn't matter that we
3020 replace all the : characters with zeros. */
3021
3022 if (ob->hostlist == NULL)
3023 {
3024 uschar *s = ob->hosts;
3025
3026 if (Ustrchr(s, '$') != NULL)
3027 {
3028 if (!(expanded_hosts = expand_string(s)))
3029 {
3030 addrlist->message = string_sprintf("failed to expand list of hosts "
3031 "\"%s\" in %s transport: %s", s, tblock->name, expand_string_message);
3032 addrlist->transport_return = search_find_defer? DEFER : PANIC;
3033 return FALSE; /* Only top address has status */
3034 }
3035 DEBUG(D_transport) debug_printf("expanded list of hosts \"%s\" to "
3036 "\"%s\"\n", s, expanded_hosts);
3037 s = expanded_hosts;
3038 }
3039 else
3040 if (ob->hosts_randomize) s = expanded_hosts = string_copy(s);
3041
3042 host_build_hostlist(&hostlist, s, ob->hosts_randomize);
3043
3044 /* Check that the expansion yielded something useful. */
3045 if (hostlist == NULL)
3046 {
3047 addrlist->message =
3048 string_sprintf("%s transport has empty hosts setting", tblock->name);
3049 addrlist->transport_return = PANIC;
3050 return FALSE; /* Only top address has status */
3051 }
3052
3053 /* If there was no expansion of hosts, save the host list for
3054 next time. */
3055
3056 if (!expanded_hosts) ob->hostlist = hostlist;
3057 }
3058
3059 /* This is not the first time this transport has been run in this delivery;
3060 the host list was built previously. */
3061
3062 else
3063 hostlist = ob->hostlist;
3064 }
3065
3066 /* The host list was supplied with the address. If hosts_randomize is set, we
3067 must sort it into a random order if it did not come from MX records and has not
3068 already been randomized (but don't bother if continuing down an existing
3069 connection). */
3070
3071 else if (ob->hosts_randomize && hostlist->mx == MX_NONE && !continuing)
3072 {
3073 host_item *newlist = NULL;
3074 while (hostlist != NULL)
3075 {
3076 host_item *h = hostlist;
3077 hostlist = hostlist->next;
3078
3079 h->sort_key = random_number(100);
3080
3081 if (newlist == NULL)
3082 {
3083 h->next = NULL;
3084 newlist = h;
3085 }
3086 else if (h->sort_key < newlist->sort_key)
3087 {
3088 h->next = newlist;
3089 newlist = h;
3090 }
3091 else
3092 {
3093 host_item *hh = newlist;
3094 while (hh->next != NULL)
3095 {
3096 if (h->sort_key < hh->next->sort_key) break;
3097 hh = hh->next;
3098 }
3099 h->next = hh->next;
3100 hh->next = h;
3101 }
3102 }
3103
3104 hostlist = addrlist->host_list = newlist;
3105 }
3106
3107 /* Sort out the default port. */
3108
3109 if (!smtp_get_port(ob->port, addrlist, &port, tid)) return FALSE;
3110
3111 /* For each host-plus-IP-address on the list:
3112
3113 . If this is a continued delivery and the host isn't the one with the
3114 current connection, skip.
3115
3116 . If the status is unusable (i.e. previously failed or retry checked), skip.
3117
3118 . If no IP address set, get the address, either by turning the name into
3119 an address, calling gethostbyname if gethostbyname is on, or by calling
3120 the DNS. The DNS may yield multiple addresses, in which case insert the
3121 extra ones into the list.
3122
3123 . Get the retry data if not previously obtained for this address and set the
3124 field which remembers the state of this address. Skip if the retry time is
3125 not reached. If not, remember whether retry data was found. The retry string
3126 contains both the name and the IP address.
3127
3128 . Scan the list of addresses and mark those whose status is DEFER as
3129 PENDING_DEFER. These are the only ones that will be processed in this cycle
3130 of the hosts loop.
3131
3132 . Make a delivery attempt - addresses marked PENDING_DEFER will be tried.
3133 Some addresses may be successfully delivered, others may fail, and yet
3134 others may get temporary errors and so get marked DEFER.
3135
3136 . The return from the delivery attempt is OK if a connection was made and a
3137 valid SMTP dialogue was completed. Otherwise it is DEFER.
3138
3139 . If OK, add a "remove" retry item for this host/IPaddress, if any.
3140
3141 . If fail to connect, or other defer state, add a retry item.
3142
3143 . If there are any addresses whose status is still DEFER, carry on to the
3144 next host/IPaddress, unless we have tried the number of hosts given
3145 by hosts_max_try or hosts_max_try_hardlimit; otherwise return. Note that
3146 there is some fancy logic for hosts_max_try that means its limit can be
3147 overstepped in some circumstances.
3148
3149 If we get to the end of the list, all hosts have deferred at least one address,
3150 or not reached their retry times. If delay_after_cutoff is unset, it requests a
3151 delivery attempt to those hosts whose last try was before the arrival time of
3152 the current message. To cope with this, we have to go round the loop a second
3153 time. After that, set the status and error data for any addresses that haven't
3154 had it set already. */
3155
3156 for (cutoff_retry = 0; expired &&
3157 cutoff_retry < ((ob->delay_after_cutoff)? 1 : 2);
3158 cutoff_retry++)
3159 {
3160 host_item *nexthost = NULL;
3161 int unexpired_hosts_tried = 0;
3162
3163 for (host = hostlist;
3164 host != NULL &&
3165 unexpired_hosts_tried < ob->hosts_max_try &&
3166 total_hosts_tried < ob->hosts_max_try_hardlimit;
3167 host = nexthost)
3168 {
3169 int rc;
3170 int host_af;
3171 uschar *rs;
3172 BOOL serialized = FALSE;
3173 BOOL host_is_expired = FALSE;
3174 BOOL message_defer = FALSE;
3175 BOOL ifchanges = FALSE;
3176 BOOL some_deferred = FALSE;
3177 address_item *first_addr = NULL;
3178 uschar *interface = NULL;
3179 uschar *retry_host_key = NULL;
3180 uschar *retry_message_key = NULL;
3181 uschar *serialize_key = NULL;
3182
3183 /* Default next host is next host. :-) But this can vary if the
3184 hosts_max_try limit is hit (see below). It may also be reset if a host
3185 address is looked up here (in case the host was multihomed). */
3186
3187 nexthost = host->next;
3188
3189 /* If the address hasn't yet been obtained from the host name, look it up
3190 now, unless the host is already marked as unusable. If it is marked as
3191 unusable, it means that the router was unable to find its IP address (in
3192 the DNS or wherever) OR we are in the 2nd time round the cutoff loop, and
3193 the lookup failed last time. We don't get this far if *all* MX records
3194 point to non-existent hosts; that is treated as a hard error.
3195
3196 We can just skip this host entirely. When the hosts came from the router,
3197 the address will timeout based on the other host(s); when the address is
3198 looked up below, there is an explicit retry record added.
3199
3200 Note that we mustn't skip unusable hosts if the address is not unset; they
3201 may be needed as expired hosts on the 2nd time round the cutoff loop. */
3202
3203 if (host->address == NULL)
3204 {
3205 int new_port, flags;
3206 host_item *hh;
3207
3208 if (host->status >= hstatus_unusable)
3209 {
3210 DEBUG(D_transport) debug_printf("%s has no address and is unusable - skipping\n",
3211 host->name);
3212 continue;
3213 }
3214
3215 DEBUG(D_transport) debug_printf("getting address for %s\n", host->name);
3216
3217 /* The host name is permitted to have an attached port. Find it, and
3218 strip it from the name. Just remember it for now. */
3219
3220 new_port = host_item_get_port(host);
3221
3222 /* Count hosts looked up */
3223
3224 hosts_looked_up++;
3225
3226 /* Find by name if so configured, or if it's an IP address. We don't
3227 just copy the IP address, because we need the test-for-local to happen. */
3228
3229 flags = HOST_FIND_BY_A;
3230 if (ob->dns_qualify_single) flags |= HOST_FIND_QUALIFY_SINGLE;
3231 if (ob->dns_search_parents) flags |= HOST_FIND_SEARCH_PARENTS;
3232
3233 if (ob->gethostbyname || string_is_ip_address(host->name, NULL) != 0)
3234 rc = host_find_byname(host, NULL, flags, NULL, TRUE);
3235 else
3236 rc = host_find_bydns(host, NULL, flags, NULL, NULL, NULL,
3237 &ob->dnssec, /* domains for request/require */
3238 NULL, NULL);
3239
3240 /* Update the host (and any additional blocks, resulting from
3241 multihoming) with a host-specific port, if any. */
3242
3243 for (hh = host; hh != nexthost; hh = hh->next) hh->port = new_port;
3244
3245 /* Failure to find the host at this time (usually DNS temporary failure)
3246 is really a kind of routing failure rather than a transport failure.
3247 Therefore we add a retry item of the routing kind, not to stop us trying
3248 to look this name up here again, but to ensure the address gets timed
3249 out if the failures go on long enough. A complete failure at this point
3250 commonly points to a configuration error, but the best action is still
3251 to carry on for the next host. */
3252
3253 if (rc == HOST_FIND_AGAIN || rc == HOST_FIND_FAILED)
3254 {
3255 retry_add_item(addrlist, string_sprintf("R:%s", host->name), 0);
3256 expired = FALSE;
3257 if (rc == HOST_FIND_AGAIN) hosts_defer++; else hosts_fail++;
3258 DEBUG(D_transport) debug_printf("rc = %s for %s\n", (rc == HOST_FIND_AGAIN)?
3259 "HOST_FIND_AGAIN" : "HOST_FIND_FAILED", host->name);
3260 host->status = hstatus_unusable;
3261
3262 for (addr = addrlist; addr != NULL; addr = addr->next)
3263 {
3264 if (addr->transport_return != DEFER) continue;
3265 addr->basic_errno = ERRNO_UNKNOWNHOST;
3266 addr->message =
3267 string_sprintf("failed to lookup IP address for %s", host->name);
3268 }
3269 continue;
3270 }
3271
3272 /* If the host is actually the local host, we may have a problem, or
3273 there may be some cunning configuration going on. In the problem case,
3274 log things and give up. The default transport status is already DEFER. */
3275
3276 if (rc == HOST_FOUND_LOCAL && !ob->allow_localhost)
3277 {
3278 for (addr = addrlist; addr != NULL; addr = addr->next)
3279 {
3280 addr->basic_errno = 0;
3281 addr->message = string_sprintf("%s transport found host %s to be "
3282 "local", tblock->name, host->name);
3283 }
3284 goto END_TRANSPORT;
3285 }
3286 } /* End of block for IP address lookup */
3287
3288 /* If this is a continued delivery, we are interested only in the host
3289 which matches the name of the existing open channel. The check is put
3290 here after the local host lookup, in case the name gets expanded as a
3291 result of the lookup. Set expired FALSE, to save the outer loop executing
3292 twice. */
3293
3294 if (continuing && (Ustrcmp(continue_hostname, host->name) != 0 ||
3295 Ustrcmp(continue_host_address, host->address) != 0))
3296 {
3297 expired = FALSE;
3298 continue; /* With next host */
3299 }
3300
3301 /* Reset the default next host in case a multihomed host whose addresses
3302 are not looked up till just above added to the host list. */
3303
3304 nexthost = host->next;
3305
3306 /* If queue_smtp is set (-odqs or the first part of a 2-stage run), or the
3307 domain is in queue_smtp_domains, we don't actually want to attempt any
3308 deliveries. When doing a queue run, queue_smtp_domains is always unset. If
3309 there is a lookup defer in queue_smtp_domains, proceed as if the domain
3310 were not in it. We don't want to hold up all SMTP deliveries! Except when
3311 doing a two-stage queue run, don't do this if forcing. */
3312
3313 if ((!deliver_force || queue_2stage) && (queue_smtp ||
3314 match_isinlist(addrlist->domain,
3315 (const uschar **)&queue_smtp_domains, 0,
3316 &domainlist_anchor, NULL, MCL_DOMAIN, TRUE, NULL) == OK))
3317 {
3318 expired = FALSE;
3319 for (addr = addrlist; addr != NULL; addr = addr->next)
3320 {
3321 if (addr->transport_return != DEFER) continue;
3322 addr->message = US"domain matches queue_smtp_domains, or -odqs set";
3323 }
3324 continue; /* With next host */
3325 }
3326
3327 /* Count hosts being considered - purely for an intelligent comment
3328 if none are usable. */
3329
3330 hosts_total++;
3331
3332 /* Set $host and $host address now in case they are needed for the
3333 interface expansion or the serialize_hosts check; they remain set if an
3334 actual delivery happens. */
3335
3336 deliver_host = host->name;
3337 deliver_host_address = host->address;
3338 lookup_dnssec_authenticated = host->dnssec == DS_YES ? US"yes"
3339 : host->dnssec == DS_NO ? US"no"
3340 : US"";
3341
3342 /* Set up a string for adding to the retry key if the port number is not
3343 the standard SMTP port. A host may have its own port setting that overrides
3344 the default. */
3345
3346 pistring = string_sprintf(":%d", (host->port == PORT_NONE)?
3347 port : host->port);
3348 if (Ustrcmp(pistring, ":25") == 0) pistring = US"";
3349
3350 /* Select IPv4 or IPv6, and choose an outgoing interface. If the interface
3351 string changes upon expansion, we must add it to the key that is used for
3352 retries, because connections to the same host from a different interface
3353 should be treated separately. */
3354
3355 host_af = (Ustrchr(host->address, ':') == NULL)? AF_INET : AF_INET6;
3356 if (!smtp_get_interface(ob->interface, host_af, addrlist, &ifchanges,
3357 &interface, tid))
3358 return FALSE;
3359 if (ifchanges) pistring = string_sprintf("%s/%s", pistring, interface);
3360
3361 /* The first time round the outer loop, check the status of the host by
3362 inspecting the retry data. The second time round, we are interested only
3363 in expired hosts that haven't been tried since this message arrived. */
3364
3365 if (cutoff_retry == 0)
3366 {
3367 BOOL incl_ip;
3368 /* Ensure the status of the address is set by checking retry data if
3369 necessary. There may be host-specific retry data (applicable to all
3370 messages) and also data for retries of a specific message at this host.
3371 If either of these retry records are actually read, the keys used are
3372 returned to save recomputing them later. */
3373
3374 if (exp_bool(addrlist, US"transport", tblock->name, D_transport,
3375 US"retry_include_ip_address", ob->retry_include_ip_address,
3376 ob->expand_retry_include_ip_address, &incl_ip) != OK)
3377 continue; /* with next host */
3378
3379 host_is_expired = retry_check_address(addrlist->domain, host, pistring,
3380 incl_ip, &retry_host_key, &retry_message_key);
3381
3382 DEBUG(D_transport) debug_printf("%s [%s]%s status = %s\n", host->name,
3383 (host->address == NULL)? US"" : host->address, pistring,
3384 (host->status == hstatus_usable)? "usable" :
3385 (host->status == hstatus_unusable)? "unusable" :
3386 (host->status == hstatus_unusable_expired)? "unusable (expired)" : "?");
3387
3388 /* Skip this address if not usable at this time, noting if it wasn't
3389 actually expired, both locally and in the address. */
3390
3391 switch (host->status)
3392 {
3393 case hstatus_unusable:
3394 expired = FALSE;
3395 setflag(addrlist, af_retry_skipped);
3396 /* Fall through */
3397
3398 case hstatus_unusable_expired:
3399 switch (host->why)
3400 {
3401 case hwhy_retry: hosts_retry++; break;
3402 case hwhy_failed: hosts_fail++; break;
3403 case hwhy_deferred: hosts_defer++; break;
3404 }
3405
3406 /* If there was a retry message key, implying that previously there
3407 was a message-specific defer, we don't want to update the list of
3408 messages waiting for these hosts. */
3409
3410 if (retry_message_key != NULL) update_waiting = FALSE;
3411 continue; /* With the next host or IP address */
3412 }
3413 }
3414
3415 /* Second time round the loop: if the address is set but expired, and
3416 the message is newer than the last try, let it through. */
3417
3418 else
3419 {
3420 if (host->address == NULL ||
3421 host->status != hstatus_unusable_expired ||
3422 host->last_try > received_time)
3423 continue;
3424 DEBUG(D_transport)
3425 debug_printf("trying expired host %s [%s]%s\n",
3426 host->name, host->address, pistring);
3427 host_is_expired = TRUE;
3428 }
3429
3430 /* Setting "expired=FALSE" doesn't actually mean not all hosts are expired;
3431 it remains TRUE only if all hosts are expired and none are actually tried.
3432 */
3433
3434 expired = FALSE;
3435
3436 /* If this host is listed as one to which access must be serialized,
3437 see if another Exim process has a connection to it, and if so, skip
3438 this host. If not, update the database to record our connection to it
3439 and remember this for later deletion. Do not do any of this if we are
3440 sending the message down a pre-existing connection. */
3441
3442 if (!continuing &&
3443 verify_check_given_host(&ob->serialize_hosts, host) == OK)
3444 {
3445 serialize_key = string_sprintf("host-serialize-%s", host->name);
3446 if (!enq_start(serialize_key))
3447 {
3448 DEBUG(D_transport)
3449 debug_printf("skipping host %s because another Exim process "
3450 "is connected to it\n", host->name);
3451 hosts_serial++;
3452 continue;
3453 }
3454 serialized = TRUE;
3455 }
3456
3457 /* OK, we have an IP address that is not waiting for its retry time to
3458 arrive (it might be expired) OR (second time round the loop) we have an
3459 expired host that hasn't been tried since the message arrived. Have a go
3460 at delivering the message to it. First prepare the addresses by flushing
3461 out the result of previous attempts, and finding the first address that
3462 is still to be delivered. */
3463
3464 first_addr = prepare_addresses(addrlist, host);
3465
3466 DEBUG(D_transport) debug_printf("delivering %s to %s [%s] (%s%s)\n",
3467 message_id, host->name, host->address, addrlist->address,
3468 (addrlist->next == NULL)? "" : ", ...");
3469
3470 set_process_info("delivering %s to %s [%s] (%s%s)",
3471 message_id, host->name, host->address, addrlist->address,
3472 (addrlist->next == NULL)? "" : ", ...");
3473
3474 /* This is not for real; don't do the delivery. If there are
3475 any remaining hosts, list them. */
3476
3477 if (dont_deliver)
3478 {
3479 host_item *host2;
3480 set_errno(addrlist, 0, NULL, OK, FALSE, NULL);
3481 for (addr = addrlist; addr != NULL; addr = addr->next)
3482 {
3483 addr->host_used = host;
3484 addr->special_action = '*';
3485 addr->message = US"delivery bypassed by -N option";
3486 }
3487 DEBUG(D_transport)
3488 {
3489 debug_printf("*** delivery by %s transport bypassed by -N option\n"
3490 "*** host and remaining hosts:\n", tblock->name);
3491 for (host2 = host; host2 != NULL; host2 = host2->next)
3492 debug_printf(" %s [%s]\n", host2->name,
3493 (host2->address == NULL)? US"unset" : host2->address);
3494 }
3495 rc = OK;
3496 }
3497
3498 /* This is for real. If the host is expired, we don't count it for
3499 hosts_max_retry. This ensures that all hosts must expire before an address
3500 is timed out, unless hosts_max_try_hardlimit (which protects against
3501 lunatic DNS configurations) is reached.
3502
3503 If the host is not expired and we are about to hit the hosts_max_retry
3504 limit, check to see if there is a subsequent hosts with a different MX
3505 value. If so, make that the next host, and don't count this one. This is a
3506 heuristic to make sure that different MXs do get tried. With a normal kind
3507 of retry rule, they would get tried anyway when the earlier hosts were
3508 delayed, but if the domain has a "retry every time" type of rule - as is
3509 often used for the the very large ISPs, that won't happen. */
3510
3511 else
3512 {
3513 host_item * thost;
3514 /* Make a copy of the host if it is local to this invocation
3515 of the transport. */
3516
3517 if (expanded_hosts)
3518 {
3519 thost = store_get(sizeof(host_item));
3520 *thost = *host;
3521 thost->name = string_copy(host->name);
3522 thost->address = string_copy(host->address);
3523 }
3524 else
3525 thost = host;
3526
3527 if (!host_is_expired && ++unexpired_hosts_tried >= ob->hosts_max_try)
3528 {
3529 host_item *h;
3530 DEBUG(D_transport)
3531 debug_printf("hosts_max_try limit reached with this host\n");
3532 for (h = host; h != NULL; h = h->next)
3533 if (h->mx != host->mx) break;
3534 if (h != NULL)
3535 {
3536 nexthost = h;
3537 unexpired_hosts_tried--;
3538 DEBUG(D_transport) debug_printf("however, a higher MX host exists "
3539 "and will be tried\n");
3540 }
3541 }
3542
3543 /* Attempt the delivery. */
3544
3545 total_hosts_tried++;
3546 rc = smtp_deliver(addrlist, thost, host_af, port, interface, tblock,
3547 &message_defer, FALSE);
3548
3549 /* Yield is one of:
3550 OK => connection made, each address contains its result;
3551 message_defer is set for message-specific defers (when all
3552 recipients are marked defer)
3553 DEFER => there was a non-message-specific delivery problem;
3554 ERROR => there was a problem setting up the arguments for a filter,
3555 or there was a problem with expanding added headers
3556 */
3557
3558 /* If the result is not OK, there was a non-message-specific problem.
3559 If the result is DEFER, we need to write to the logs saying what happened
3560 for this particular host, except in the case of authentication and TLS
3561 failures, where the log has already been written. If all hosts defer a
3562 general message is written at the end. */
3563
3564 if (rc == DEFER && first_addr->basic_errno != ERRNO_AUTHFAIL &&
3565 first_addr->basic_errno != ERRNO_TLSFAILURE)
3566 write_logs(first_addr, host);
3567
3568 #ifdef EXPERIMENTAL_EVENT
3569 if (rc == DEFER)
3570 deferred_event_raise(first_addr, host);
3571 #endif
3572
3573 /* If STARTTLS was accepted, but there was a failure in setting up the
3574 TLS session (usually a certificate screwup), and the host is not in
3575 hosts_require_tls, and tls_tempfail_tryclear is true, try again, with
3576 TLS forcibly turned off. We have to start from scratch with a new SMTP
3577 connection. That's why the retry is done from here, not from within
3578 smtp_deliver(). [Rejections of STARTTLS itself don't screw up the
3579 session, so the in-clear transmission after those errors, if permitted,
3580 happens inside smtp_deliver().] */
3581
3582 #ifdef SUPPORT_TLS
3583 if ( rc == DEFER
3584 && first_addr->basic_errno == ERRNO_TLSFAILURE
3585 && ob->tls_tempfail_tryclear
3586 && verify_check_given_host(&ob->hosts_require_tls, host) != OK
3587 )
3588 {
3589 log_write(0, LOG_MAIN, "TLS session failure: delivering unencrypted "
3590 "to %s [%s] (not in hosts_require_tls)", host->name, host->address);
3591 first_addr = prepare_addresses(addrlist, host);
3592 rc = smtp_deliver(addrlist, thost, host_af, port, interface, tblock,
3593 &message_defer, TRUE);
3594 if (rc == DEFER && first_addr->basic_errno != ERRNO_AUTHFAIL)
3595 write_logs(first_addr, host);
3596 # ifdef EXPERIMENTAL_EVENT
3597 if (rc == DEFER)
3598 deferred_event_raise(first_addr, host);
3599 # endif
3600 }
3601 #endif /*SUPPORT_TLS*/
3602 }
3603
3604 /* Delivery attempt finished */
3605
3606 rs = (rc == OK)? US"OK" : (rc == DEFER)? US"DEFER" : (rc == ERROR)?
3607 US"ERROR" : US"?";
3608
3609 set_process_info("delivering %s: just tried %s [%s] for %s%s: result %s",
3610 message_id, host->name, host->address, addrlist->address,
3611 (addrlist->next == NULL)? "" : " (& others)", rs);
3612
3613 /* Release serialization if set up */
3614
3615 if (serialized) enq_end(serialize_key);
3616
3617 /* If the result is DEFER, or if a host retry record is known to exist, we
3618 need to add an item to the retry chain for updating the retry database
3619 at the end of delivery. We only need to add the item to the top address,
3620 of course. Also, if DEFER, we mark the IP address unusable so as to skip it
3621 for any other delivery attempts using the same address. (It is copied into
3622 the unusable tree at the outer level, so even if different address blocks
3623 contain the same address, it still won't get tried again.) */
3624
3625 if (rc == DEFER || retry_host_key != NULL)
3626 {
3627 int delete_flag = (rc != DEFER)? rf_delete : 0;
3628 if (retry_host_key == NULL)
3629 {
3630 BOOL incl_ip;
3631 if (exp_bool(addrlist, US"transport", tblock->name, D_transport,
3632 US"retry_include_ip_address", ob->retry_include_ip_address,
3633 ob->expand_retry_include_ip_address, &incl_ip) != OK)
3634 incl_ip = TRUE; /* error; use most-specific retry record */
3635
3636 retry_host_key = incl_ip ?
3637 string_sprintf("T:%S:%s%s", host->name, host->address, pistring) :
3638 string_sprintf("T:%S%s", host->name, pistring);
3639 }
3640
3641 /* If a delivery of another message over an existing SMTP connection
3642 yields DEFER, we do NOT set up retry data for the host. This covers the
3643 case when there are delays in routing the addresses in the second message
3644 that are so long that the server times out. This is alleviated by not
3645 routing addresses that previously had routing defers when handling an
3646 existing connection, but even so, this case may occur (e.g. if a
3647 previously happily routed address starts giving routing defers). If the
3648 host is genuinely down, another non-continued message delivery will
3649 notice it soon enough. */
3650
3651 if (delete_flag != 0 || !continuing)
3652 retry_add_item(first_addr, retry_host_key, rf_host | delete_flag);
3653
3654 /* We may have tried an expired host, if its retry time has come; ensure
3655 the status reflects the expiry for the benefit of any other addresses. */
3656
3657 if (rc == DEFER)
3658 {
3659 host->status = (host_is_expired)?
3660 hstatus_unusable_expired : hstatus_unusable;
3661 host->why = hwhy_deferred;
3662 }
3663 }
3664
3665 /* If message_defer is set (host was OK, but every recipient got deferred
3666 because of some message-specific problem), or if that had happened
3667 previously so that a message retry key exists, add an appropriate item
3668 to the retry chain. Note that if there was a message defer but now there is
3669 a host defer, the message defer record gets deleted. That seems perfectly
3670 reasonable. Also, stop the message from being remembered as waiting
3671 for specific hosts. */
3672
3673 if (message_defer || retry_message_key != NULL)
3674 {
3675 int delete_flag = message_defer? 0 : rf_delete;
3676 if (retry_message_key == NULL)
3677 {
3678 BOOL incl_ip;
3679 if (exp_bool(addrlist, US"transport", tblock->name, D_transport,
3680 US"retry_include_ip_address", ob->retry_include_ip_address,
3681 ob->expand_retry_include_ip_address, &incl_ip) != OK)
3682 incl_ip = TRUE; /* error; use most-specific retry record */
3683
3684 retry_message_key = incl_ip ?
3685 string_sprintf("T:%S:%s%s:%s", host->name, host->address, pistring,
3686 message_id) :
3687 string_sprintf("T:%S%s:%s", host->name, pistring, message_id);
3688 }
3689 retry_add_item(addrlist, retry_message_key,
3690 rf_message | rf_host | delete_flag);
3691 update_waiting = FALSE;
3692 }
3693
3694 /* Any return other than DEFER (that is, OK or ERROR) means that the
3695 addresses have got their final statuses filled in for this host. In the OK
3696 case, see if any of them are deferred. */
3697
3698 if (rc == OK)
3699 for (addr = addrlist; addr; addr = addr->next)
3700 if (addr->transport_return == DEFER)
3701 {
3702 some_deferred = TRUE;
3703 break;
3704 }
3705
3706 /* If no addresses deferred or the result was ERROR, return. We do this for
3707 ERROR because a failing filter set-up or add_headers expansion is likely to
3708 fail for any host we try. */
3709
3710 if (rc == ERROR || (rc == OK && !some_deferred))
3711 {
3712 DEBUG(D_transport) debug_printf("Leaving %s transport\n", tblock->name);
3713 return TRUE; /* Each address has its status */
3714 }
3715
3716 /* If the result was DEFER or some individual addresses deferred, let
3717 the loop run to try other hosts with the deferred addresses, except for the
3718 case when we were trying to deliver down an existing channel and failed.
3719 Don't try any other hosts in this case. */
3720
3721 if (continuing) break;
3722
3723 /* If the whole delivery, or some individual addresses, were deferred and
3724 there are more hosts that could be tried, do not count this host towards
3725 the hosts_max_try limit if the age of the message is greater than the
3726 maximum retry time for this host. This means we may try try all hosts,
3727 ignoring the limit, when messages have been around for some time. This is
3728 important because if we don't try all hosts, the address will never time
3729 out. NOTE: this does not apply to hosts_max_try_hardlimit. */
3730
3731 if ((rc == DEFER || some_deferred) && nexthost != NULL)
3732 {
3733 BOOL timedout;
3734 retry_config *retry = retry_find_config(host->name, NULL, 0, 0);
3735
3736 if (retry != NULL && retry->rules != NULL)
3737 {
3738 retry_rule *last_rule;
3739 for (last_rule = retry->rules;
3740 last_rule->next != NULL;
3741 last_rule = last_rule->next);
3742 timedout = time(NULL) - received_time > last_rule->timeout;
3743 }
3744 else timedout = TRUE; /* No rule => timed out */
3745
3746 if (timedout)
3747 {
3748 unexpired_hosts_tried--;
3749 DEBUG(D_transport) debug_printf("temporary delivery error(s) override "
3750 "hosts_max_try (message older than host's retry time)\n");
3751 }
3752 }
3753 } /* End of loop for trying multiple hosts. */
3754
3755 /* This is the end of the loop that repeats iff expired is TRUE and
3756 ob->delay_after_cutoff is FALSE. The second time round we will
3757 try those hosts that haven't been tried since the message arrived. */
3758
3759 DEBUG(D_transport)
3760 {
3761 debug_printf("all IP addresses skipped or deferred at least one address\n");
3762 if (expired && !ob->delay_after_cutoff && cutoff_retry == 0)
3763 debug_printf("retrying IP addresses not tried since message arrived\n");
3764 }
3765 }
3766
3767
3768 /* Get here if all IP addresses are skipped or defer at least one address. In
3769 MUA wrapper mode, this will happen only for connection or other non-message-
3770 specific failures. Force the delivery status for all addresses to FAIL. */
3771
3772 if (mua_wrapper)
3773 {
3774 for (addr = addrlist; addr != NULL; addr = addr->next)
3775 addr->transport_return = FAIL;
3776 goto END_TRANSPORT;
3777 }
3778
3779 /* In the normal, non-wrapper case, add a standard message to each deferred
3780 address if there hasn't been an error, that is, if it hasn't actually been
3781 tried this time. The variable "expired" will be FALSE if any deliveries were
3782 actually tried, or if there was at least one host that was not expired. That
3783 is, it is TRUE only if no deliveries were tried and all hosts were expired. If
3784 a delivery has been tried, an error code will be set, and the failing of the
3785 message is handled by the retry code later.
3786
3787 If queue_smtp is set, or this transport was called to send a subsequent message
3788 down an existing TCP/IP connection, and something caused the host not to be
3789 found, we end up here, but can detect these cases and handle them specially. */
3790
3791 for (addr = addrlist; addr != NULL; addr = addr->next)
3792 {
3793 /* If host is not NULL, it means that we stopped processing the host list
3794 because of hosts_max_try or hosts_max_try_hardlimit. In the former case, this
3795 means we need to behave as if some hosts were skipped because their retry
3796 time had not come. Specifically, this prevents the address from timing out.
3797 However, if we have hit hosts_max_try_hardlimit, we want to behave as if all
3798 hosts were tried. */
3799
3800 if (host != NULL)
3801 {
3802 if (total_hosts_tried >= ob->hosts_max_try_hardlimit)
3803 {
3804 DEBUG(D_transport)
3805 debug_printf("hosts_max_try_hardlimit reached: behave as if all "
3806 "hosts were tried\n");
3807 }
3808 else
3809 {
3810 DEBUG(D_transport)
3811 debug_printf("hosts_max_try limit caused some hosts to be skipped\n");
3812 setflag(addr, af_retry_skipped);
3813 }
3814 }
3815
3816 if (queue_smtp) /* no deliveries attempted */
3817 {
3818 addr->transport_return = DEFER;
3819 addr->basic_errno = 0;
3820 addr->message = US"SMTP delivery explicitly queued";
3821 }
3822
3823 else if (addr->transport_return == DEFER &&
3824 (addr->basic_errno == ERRNO_UNKNOWNERROR || addr->basic_errno == 0) &&
3825 addr->message == NULL)
3826 {
3827 addr->basic_errno = ERRNO_HRETRY;
3828 if (continue_hostname != NULL)
3829 {
3830 addr->message = US"no host found for existing SMTP connection";
3831 }
3832 else if (expired)
3833 {
3834 setflag(addr, af_pass_message); /* This is not a security risk */
3835 addr->message = (ob->delay_after_cutoff)?
3836 US"retry time not reached for any host after a long failure period" :
3837 US"all hosts have been failing for a long time and were last tried "
3838 "after this message arrived";
3839
3840 /* If we are already using fallback hosts, or there are no fallback hosts
3841 defined, convert the result to FAIL to cause a bounce. */
3842
3843 if (addr->host_list == addr->fallback_hosts ||
3844 addr->fallback_hosts == NULL)
3845 addr->transport_return = FAIL;
3846 }
3847 else
3848 {
3849 if (hosts_retry == hosts_total)
3850 addr->message = US"retry time not reached for any host";
3851 else if (hosts_fail == hosts_total)
3852 addr->message = US"all host address lookups failed permanently";
3853 else if (hosts_defer == hosts_total)
3854 addr->message = US"all host address lookups failed temporarily";
3855 else if (hosts_serial == hosts_total)
3856 addr->message = US"connection limit reached for all hosts";
3857 else if (hosts_fail+hosts_defer == hosts_total)
3858 addr->message = US"all host address lookups failed";
3859 else addr->message = US"some host address lookups failed and retry time "
3860 "not reached for other hosts or connection limit reached";
3861 }
3862 }
3863 }
3864
3865 /* Update the database which keeps information about which messages are waiting
3866 for which hosts to become available. For some message-specific errors, the
3867 update_waiting flag is turned off because we don't want follow-on deliveries in
3868 those cases. If this transport instance is explicitly limited to one message
3869 per connection then follow-on deliveries are not possible and there's no need
3870 to create/update the per-transport wait-<transport_name> database. */
3871
3872 if (update_waiting && tblock->connection_max_messages != 1)
3873 transport_update_waiting(hostlist, tblock->name);
3874
3875 END_TRANSPORT:
3876
3877 DEBUG(D_transport) debug_printf("Leaving %s transport\n", tblock->name);
3878
3879 return TRUE; /* Each address has its status */
3880 }
3881
3882 /* vi: aw ai sw=2
3883 */
3884 /* End of transport/smtp.c */
Unnamed repository; edit this file 'description' to name the repository.