33de45cd71c8947995e50c53c1b4d78f5152541f
[exim.git] / src / src / transports / smtp.c
1 /*************************************************
2 * Exim - an Internet mail transport agent *
3 *************************************************/
4
5 /* Copyright (c) University of Cambridge 1995 - 2016 */
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.dkim_canon) },
48 { "dkim_domain", opt_stringptr,
49 (void *)offsetof(smtp_transport_options_block, dkim.dkim_domain) },
50 { "dkim_private_key", opt_stringptr,
51 (void *)offsetof(smtp_transport_options_block, dkim.dkim_private_key) },
52 { "dkim_selector", opt_stringptr,
53 (void *)offsetof(smtp_transport_options_block, dkim.dkim_selector) },
54 { "dkim_sign_headers", opt_stringptr,
55 (void *)offsetof(smtp_transport_options_block, dkim.dkim_sign_headers) },
56 { "dkim_strict", opt_stringptr,
57 (void *)offsetof(smtp_transport_options_block, dkim.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 { "helo_data", opt_stringptr,
76 (void *)offsetof(smtp_transport_options_block, helo_data) },
77 { "hosts", opt_stringptr,
78 (void *)offsetof(smtp_transport_options_block, hosts) },
79 { "hosts_avoid_esmtp", opt_stringptr,
80 (void *)offsetof(smtp_transport_options_block, hosts_avoid_esmtp) },
81 { "hosts_avoid_pipelining", opt_stringptr,
82 (void *)offsetof(smtp_transport_options_block, hosts_avoid_pipelining) },
83 #ifdef SUPPORT_TLS
84 { "hosts_avoid_tls", opt_stringptr,
85 (void *)offsetof(smtp_transport_options_block, hosts_avoid_tls) },
86 #endif
87 { "hosts_max_try", opt_int,
88 (void *)offsetof(smtp_transport_options_block, hosts_max_try) },
89 { "hosts_max_try_hardlimit", opt_int,
90 (void *)offsetof(smtp_transport_options_block, hosts_max_try_hardlimit) },
91 #ifdef SUPPORT_TLS
92 { "hosts_nopass_tls", opt_stringptr,
93 (void *)offsetof(smtp_transport_options_block, hosts_nopass_tls) },
94 #endif
95 { "hosts_override", opt_bool,
96 (void *)offsetof(smtp_transport_options_block, hosts_override) },
97 { "hosts_randomize", opt_bool,
98 (void *)offsetof(smtp_transport_options_block, hosts_randomize) },
99 #if defined(SUPPORT_TLS) && !defined(DISABLE_OCSP)
100 { "hosts_request_ocsp", opt_stringptr,
101 (void *)offsetof(smtp_transport_options_block, hosts_request_ocsp) },
102 #endif
103 { "hosts_require_auth", opt_stringptr,
104 (void *)offsetof(smtp_transport_options_block, hosts_require_auth) },
105 #ifdef SUPPORT_TLS
106 # ifdef EXPERIMENTAL_DANE
107 { "hosts_require_dane", opt_stringptr,
108 (void *)offsetof(smtp_transport_options_block, hosts_require_dane) },
109 # endif
110 # ifndef DISABLE_OCSP
111 { "hosts_require_ocsp", opt_stringptr,
112 (void *)offsetof(smtp_transport_options_block, hosts_require_ocsp) },
113 # endif
114 { "hosts_require_tls", opt_stringptr,
115 (void *)offsetof(smtp_transport_options_block, hosts_require_tls) },
116 #endif
117 { "hosts_try_auth", opt_stringptr,
118 (void *)offsetof(smtp_transport_options_block, hosts_try_auth) },
119 { "hosts_try_chunking", opt_stringptr,
120 (void *)offsetof(smtp_transport_options_block, hosts_try_chunking) },
121 #if defined(SUPPORT_TLS) && defined(EXPERIMENTAL_DANE)
122 { "hosts_try_dane", opt_stringptr,
123 (void *)offsetof(smtp_transport_options_block, hosts_try_dane) },
124 #endif
125 #ifndef DISABLE_PRDR
126 { "hosts_try_prdr", opt_stringptr,
127 (void *)offsetof(smtp_transport_options_block, hosts_try_prdr) },
128 #endif
129 #ifdef SUPPORT_TLS
130 { "hosts_verify_avoid_tls", opt_stringptr,
131 (void *)offsetof(smtp_transport_options_block, hosts_verify_avoid_tls) },
132 #endif
133 { "interface", opt_stringptr,
134 (void *)offsetof(smtp_transport_options_block, interface) },
135 { "keepalive", opt_bool,
136 (void *)offsetof(smtp_transport_options_block, keepalive) },
137 { "lmtp_ignore_quota", opt_bool,
138 (void *)offsetof(smtp_transport_options_block, lmtp_ignore_quota) },
139 { "max_rcpt", opt_int | opt_public,
140 (void *)offsetof(transport_instance, max_addresses) },
141 { "multi_domain", opt_expand_bool | opt_public,
142 (void *)offsetof(transport_instance, multi_domain) },
143 { "port", opt_stringptr,
144 (void *)offsetof(smtp_transport_options_block, port) },
145 { "protocol", opt_stringptr,
146 (void *)offsetof(smtp_transport_options_block, protocol) },
147 { "retry_include_ip_address", opt_expand_bool,
148 (void *)offsetof(smtp_transport_options_block, retry_include_ip_address) },
149 { "serialize_hosts", opt_stringptr,
150 (void *)offsetof(smtp_transport_options_block, serialize_hosts) },
151 { "size_addition", opt_int,
152 (void *)offsetof(smtp_transport_options_block, size_addition) }
153 #ifdef SUPPORT_SOCKS
154 ,{ "socks_proxy", opt_stringptr,
155 (void *)offsetof(smtp_transport_options_block, socks_proxy) }
156 #endif
157 #ifdef SUPPORT_TLS
158 ,{ "tls_certificate", opt_stringptr,
159 (void *)offsetof(smtp_transport_options_block, tls_certificate) },
160 { "tls_crl", opt_stringptr,
161 (void *)offsetof(smtp_transport_options_block, tls_crl) },
162 { "tls_dh_min_bits", opt_int,
163 (void *)offsetof(smtp_transport_options_block, tls_dh_min_bits) },
164 { "tls_privatekey", opt_stringptr,
165 (void *)offsetof(smtp_transport_options_block, tls_privatekey) },
166 { "tls_require_ciphers", opt_stringptr,
167 (void *)offsetof(smtp_transport_options_block, tls_require_ciphers) },
168 { "tls_sni", opt_stringptr,
169 (void *)offsetof(smtp_transport_options_block, tls_sni) },
170 { "tls_tempfail_tryclear", opt_bool,
171 (void *)offsetof(smtp_transport_options_block, tls_tempfail_tryclear) },
172 { "tls_try_verify_hosts", opt_stringptr,
173 (void *)offsetof(smtp_transport_options_block, tls_try_verify_hosts) },
174 { "tls_verify_cert_hostnames", opt_stringptr,
175 (void *)offsetof(smtp_transport_options_block,tls_verify_cert_hostnames)},
176 { "tls_verify_certificates", opt_stringptr,
177 (void *)offsetof(smtp_transport_options_block, tls_verify_certificates) },
178 { "tls_verify_hosts", opt_stringptr,
179 (void *)offsetof(smtp_transport_options_block, tls_verify_hosts) }
180 #endif
181 };
182
183 /* Size of the options list. An extern variable has to be used so that its
184 address can appear in the tables drtables.c. */
185
186 int smtp_transport_options_count =
187 sizeof(smtp_transport_options)/sizeof(optionlist);
188
189 /* Default private options block for the smtp transport. */
190
191 smtp_transport_options_block smtp_transport_option_defaults = {
192 NULL, /* hosts */
193 NULL, /* fallback_hosts */
194 NULL, /* hostlist */
195 NULL, /* fallback_hostlist */
196 NULL, /* authenticated_sender */
197 US"$primary_hostname", /* helo_data */
198 NULL, /* interface */
199 NULL, /* port */
200 US"smtp", /* protocol */
201 NULL, /* DSCP */
202 NULL, /* serialize_hosts */
203 NULL, /* hosts_try_auth */
204 NULL, /* hosts_require_auth */
205 US"*", /* hosts_try_chunking */
206 #ifdef EXPERIMENTAL_DANE
207 NULL, /* hosts_try_dane */
208 NULL, /* hosts_require_dane */
209 #endif
210 #ifndef DISABLE_PRDR
211 US"*", /* hosts_try_prdr */
212 #endif
213 #ifndef DISABLE_OCSP
214 US"*", /* hosts_request_ocsp (except under DANE; tls_client_start()) */
215 NULL, /* hosts_require_ocsp */
216 #endif
217 NULL, /* hosts_require_tls */
218 NULL, /* hosts_avoid_tls */
219 NULL, /* hosts_verify_avoid_tls */
220 NULL, /* hosts_avoid_pipelining */
221 NULL, /* hosts_avoid_esmtp */
222 NULL, /* hosts_nopass_tls */
223 5*60, /* command_timeout */
224 5*60, /* connect_timeout; shorter system default overrides */
225 5*60, /* data timeout */
226 10*60, /* final timeout */
227 1024, /* size_addition */
228 5, /* hosts_max_try */
229 50, /* hosts_max_try_hardlimit */
230 TRUE, /* address_retry_include_sender */
231 FALSE, /* allow_localhost */
232 FALSE, /* authenticated_sender_force */
233 FALSE, /* gethostbyname */
234 TRUE, /* dns_qualify_single */
235 FALSE, /* dns_search_parents */
236 { NULL, NULL }, /* dnssec_domains {request,require} */
237 TRUE, /* delay_after_cutoff */
238 FALSE, /* hosts_override */
239 FALSE, /* hosts_randomize */
240 TRUE, /* keepalive */
241 FALSE, /* lmtp_ignore_quota */
242 NULL, /* expand_retry_include_ip_address */
243 TRUE /* retry_include_ip_address */
244 #ifdef SUPPORT_SOCKS
245 ,NULL /* socks_proxy */
246 #endif
247 #ifdef SUPPORT_TLS
248 ,NULL, /* tls_certificate */
249 NULL, /* tls_crl */
250 NULL, /* tls_privatekey */
251 NULL, /* tls_require_ciphers */
252 NULL, /* tls_sni */
253 US"system", /* tls_verify_certificates */
254 EXIM_CLIENT_DH_DEFAULT_MIN_BITS,
255 /* tls_dh_min_bits */
256 TRUE, /* tls_tempfail_tryclear */
257 NULL, /* tls_verify_hosts */
258 US"*", /* tls_try_verify_hosts */
259 US"*" /* tls_verify_cert_hostnames */
260 #endif
261 #ifndef DISABLE_DKIM
262 , {NULL, /* dkim_canon */
263 NULL, /* dkim_domain */
264 NULL, /* dkim_private_key */
265 NULL, /* dkim_selector */
266 NULL, /* dkim_sign_headers */
267 NULL} /* dkim_strict */
268 #endif
269 };
270
271 /* some DSN flags for use later */
272
273 static int rf_list[] = {rf_notify_never, rf_notify_success,
274 rf_notify_failure, rf_notify_delay };
275
276 static uschar *rf_names[] = { US"NEVER", US"SUCCESS", US"FAILURE", US"DELAY" };
277
278
279
280 /* Local statics */
281
282 static uschar *smtp_command; /* Points to last cmd for error messages */
283 static uschar *mail_command; /* Points to MAIL cmd for error messages */
284 static BOOL update_waiting; /* TRUE to update the "wait" database */
285
286
287 /*************************************************
288 * Setup entry point *
289 *************************************************/
290
291 /* This function is called when the transport is about to be used,
292 but before running it in a sub-process. It is used for two things:
293
294 (1) To set the fallback host list in addresses, when delivering.
295 (2) To pass back the interface, port, protocol, and other options, for use
296 during callout verification.
297
298 Arguments:
299 tblock pointer to the transport instance block
300 addrlist list of addresses about to be transported
301 tf if not NULL, pointer to block in which to return options
302 uid the uid that will be set (not used)
303 gid the gid that will be set (not used)
304 errmsg place for error message (not used)
305
306 Returns: OK always (FAIL, DEFER not used)
307 */
308
309 static int
310 smtp_transport_setup(transport_instance *tblock, address_item *addrlist,
311 transport_feedback *tf, uid_t uid, gid_t gid, uschar **errmsg)
312 {
313 smtp_transport_options_block *ob =
314 (smtp_transport_options_block *)(tblock->options_block);
315
316 errmsg = errmsg; /* Keep picky compilers happy */
317 uid = uid;
318 gid = gid;
319
320 /* Pass back options if required. This interface is getting very messy. */
321
322 if (tf != NULL)
323 {
324 tf->interface = ob->interface;
325 tf->port = ob->port;
326 tf->protocol = ob->protocol;
327 tf->hosts = ob->hosts;
328 tf->hosts_override = ob->hosts_override;
329 tf->hosts_randomize = ob->hosts_randomize;
330 tf->gethostbyname = ob->gethostbyname;
331 tf->qualify_single = ob->dns_qualify_single;
332 tf->search_parents = ob->dns_search_parents;
333 tf->helo_data = ob->helo_data;
334 }
335
336 /* Set the fallback host list for all the addresses that don't have fallback
337 host lists, provided that the local host wasn't present in the original host
338 list. */
339
340 if (!testflag(addrlist, af_local_host_removed))
341 {
342 for (; addrlist != NULL; addrlist = addrlist->next)
343 if (addrlist->fallback_hosts == NULL)
344 addrlist->fallback_hosts = ob->fallback_hostlist;
345 }
346
347 return OK;
348 }
349
350
351
352 /*************************************************
353 * Initialization entry point *
354 *************************************************/
355
356 /* Called for each instance, after its options have been read, to
357 enable consistency checks to be done, or anything else that needs
358 to be set up.
359
360 Argument: pointer to the transport instance block
361 Returns: nothing
362 */
363
364 void
365 smtp_transport_init(transport_instance *tblock)
366 {
367 smtp_transport_options_block *ob =
368 (smtp_transport_options_block *)(tblock->options_block);
369
370 /* Retry_use_local_part defaults FALSE if unset */
371
372 if (tblock->retry_use_local_part == TRUE_UNSET)
373 tblock->retry_use_local_part = FALSE;
374
375 /* Set the default port according to the protocol */
376
377 if (ob->port == NULL)
378 ob->port = (strcmpic(ob->protocol, US"lmtp") == 0)? US"lmtp" :
379 (strcmpic(ob->protocol, US"smtps") == 0)? US"smtps" : US"smtp";
380
381 /* Set up the setup entry point, to be called before subprocesses for this
382 transport. */
383
384 tblock->setup = smtp_transport_setup;
385
386 /* Complain if any of the timeouts are zero. */
387
388 if (ob->command_timeout <= 0 || ob->data_timeout <= 0 ||
389 ob->final_timeout <= 0)
390 log_write(0, LOG_PANIC_DIE|LOG_CONFIG,
391 "command, data, or final timeout value is zero for %s transport",
392 tblock->name);
393
394 /* If hosts_override is set and there are local hosts, set the global
395 flag that stops verify from showing router hosts. */
396
397 if (ob->hosts_override && ob->hosts != NULL) tblock->overrides_hosts = TRUE;
398
399 /* If there are any fallback hosts listed, build a chain of host items
400 for them, but do not do any lookups at this time. */
401
402 host_build_hostlist(&(ob->fallback_hostlist), ob->fallback_hosts, FALSE);
403 }
404
405
406
407
408
409 /*************************************************
410 * Set delivery info into all active addresses *
411 *************************************************/
412
413 /* Only addresses whose status is >= PENDING are relevant. A lesser
414 status means that an address is not currently being processed.
415
416 Arguments:
417 addrlist points to a chain of addresses
418 errno_value to put in each address's errno field
419 msg to put in each address's message field
420 rc to put in each address's transport_return field
421 pass_message if TRUE, set the "pass message" flag in the address
422 host if set, mark addrs as having used this host
423 smtp_greeting from peer
424 helo_response from peer
425
426 If errno_value has the special value ERRNO_CONNECTTIMEOUT, ETIMEDOUT is put in
427 the errno field, and RTEF_CTOUT is ORed into the more_errno field, to indicate
428 this particular type of timeout.
429
430 Returns: nothing
431 */
432
433 static void
434 set_errno(address_item *addrlist, int errno_value, uschar *msg, int rc,
435 BOOL pass_message, host_item * host
436 #ifdef EXPERIMENTAL_DSN_INFO
437 , const uschar * smtp_greeting, const uschar * helo_response
438 #endif
439 )
440 {
441 address_item *addr;
442 int orvalue = 0;
443 if (errno_value == ERRNO_CONNECTTIMEOUT)
444 {
445 errno_value = ETIMEDOUT;
446 orvalue = RTEF_CTOUT;
447 }
448 for (addr = addrlist; addr; addr = addr->next)
449 if (addr->transport_return >= PENDING)
450 {
451 addr->basic_errno = errno_value;
452 addr->more_errno |= orvalue;
453 if (msg != NULL)
454 {
455 addr->message = msg;
456 if (pass_message) setflag(addr, af_pass_message);
457 }
458 addr->transport_return = rc;
459 if (host)
460 {
461 addr->host_used = host;
462 #ifdef EXPERIMENTAL_DSN_INFO
463 if (smtp_greeting)
464 {uschar * s = Ustrchr(smtp_greeting, '\n'); if (s) *s = '\0';}
465 addr->smtp_greeting = smtp_greeting;
466
467 if (helo_response)
468 {uschar * s = Ustrchr(helo_response, '\n'); if (s) *s = '\0';}
469 addr->helo_response = helo_response;
470 #endif
471 }
472 }
473 }
474
475 static void
476 set_errno_nohost(address_item *addrlist, int errno_value, uschar *msg, int rc,
477 BOOL pass_message)
478 {
479 set_errno(addrlist, errno_value, msg, rc, pass_message, NULL
480 #ifdef EXPERIMENTAL_DSN_INFO
481 , NULL, NULL
482 #endif
483 );
484 }
485
486
487 /*************************************************
488 * Check an SMTP response *
489 *************************************************/
490
491 /* This function is given an errno code and the SMTP response buffer
492 to analyse, together with the host identification for generating messages. It
493 sets an appropriate message and puts the first digit of the response code into
494 the yield variable. If no response was actually read, a suitable digit is
495 chosen.
496
497 Arguments:
498 host the current host, to get its name for messages
499 errno_value pointer to the errno value
500 more_errno from the top address for use with ERRNO_FILTER_FAIL
501 buffer the SMTP response buffer
502 yield where to put a one-digit SMTP response code
503 message where to put an errror message
504 pass_message set TRUE if message is an SMTP response
505
506 Returns: TRUE if an SMTP "QUIT" command should be sent, else FALSE
507 */
508
509 static BOOL
510 check_response(host_item *host, int *errno_value, int more_errno,
511 uschar *buffer, int *yield, uschar **message, BOOL *pass_message)
512 {
513 uschar *pl = US"";
514
515 if (smtp_use_pipelining &&
516 (Ustrcmp(smtp_command, "MAIL") == 0 ||
517 Ustrcmp(smtp_command, "RCPT") == 0 ||
518 Ustrcmp(smtp_command, "DATA") == 0))
519 pl = US"pipelined ";
520
521 *yield = '4'; /* Default setting is to give a temporary error */
522
523 /* Handle response timeout */
524
525 if (*errno_value == ETIMEDOUT)
526 {
527 *message = US string_sprintf("SMTP timeout after %s%s",
528 pl, smtp_command);
529 if (transport_count > 0)
530 *message = US string_sprintf("%s (%d bytes written)", *message,
531 transport_count);
532 return FALSE;
533 }
534
535 /* Handle malformed SMTP response */
536
537 if (*errno_value == ERRNO_SMTPFORMAT)
538 {
539 const uschar *malfresp = string_printing(buffer);
540 while (isspace(*malfresp)) malfresp++;
541 *message = *malfresp == 0
542 ? string_sprintf("Malformed SMTP reply (an empty line) "
543 "in response to %s%s", pl, smtp_command)
544 : string_sprintf("Malformed SMTP reply in response to %s%s: %s",
545 pl, smtp_command, malfresp);
546 return FALSE;
547 }
548
549 /* Handle a failed filter process error; can't send QUIT as we mustn't
550 end the DATA. */
551
552 if (*errno_value == ERRNO_FILTER_FAIL)
553 {
554 *message = US string_sprintf("transport filter process failed (%d)%s",
555 more_errno,
556 (more_errno == EX_EXECFAILED)? ": unable to execute command" : "");
557 return FALSE;
558 }
559
560 /* Handle a failed add_headers expansion; can't send QUIT as we mustn't
561 end the DATA. */
562
563 if (*errno_value == ERRNO_CHHEADER_FAIL)
564 {
565 *message =
566 US string_sprintf("failed to expand headers_add or headers_remove: %s",
567 expand_string_message);
568 return FALSE;
569 }
570
571 /* Handle failure to write a complete data block */
572
573 if (*errno_value == ERRNO_WRITEINCOMPLETE)
574 {
575 *message = US string_sprintf("failed to write a data block");
576 return FALSE;
577 }
578
579 #ifdef SUPPORT_I18N
580 /* Handle lack of advertised SMTPUTF8, for international message */
581 if (*errno_value == ERRNO_UTF8_FWD)
582 {
583 *message = US string_sprintf("utf8 support required but not offered for forwarding");
584 DEBUG(D_deliver|D_transport) debug_printf("%s\n", *message);
585 return TRUE;
586 }
587 #endif
588
589 /* Handle error responses from the remote mailer. */
590
591 if (buffer[0] != 0)
592 {
593 const uschar *s = string_printing(buffer);
594 *message = US string_sprintf("SMTP error from remote mail server after %s%s: "
595 "%s", pl, smtp_command, s);
596 *pass_message = TRUE;
597 *yield = buffer[0];
598 return TRUE;
599 }
600
601 /* No data was read. If there is no errno, this must be the EOF (i.e.
602 connection closed) case, which causes deferral. An explicit connection reset
603 error has the same effect. Otherwise, put the host's identity in the message,
604 leaving the errno value to be interpreted as well. In all cases, we have to
605 assume the connection is now dead. */
606
607 if (*errno_value == 0 || *errno_value == ECONNRESET)
608 {
609 *errno_value = ERRNO_SMTPCLOSED;
610 *message = US string_sprintf("Remote host closed connection "
611 "in response to %s%s", pl, smtp_command);
612 }
613 else *message = US string_sprintf("%s [%s]", host->name, host->address);
614
615 return FALSE;
616 }
617
618
619
620 /*************************************************
621 * Write error message to logs *
622 *************************************************/
623
624 /* This writes to the main log and to the message log.
625
626 Arguments:
627 addr the address item containing error information
628 host the current host
629
630 Returns: nothing
631 */
632
633 static void
634 write_logs(address_item *addr, host_item *host)
635 {
636 uschar * message = string_sprintf("H=%s [%s]", host->name, host->address);
637
638 if (LOGGING(outgoing_port))
639 message = string_sprintf("%s:%d", message,
640 host->port == PORT_NONE ? 25 : host->port);
641 if (addr->message)
642 {
643 message = string_sprintf("%s: %s", message, addr->message);
644 if (addr->basic_errno > 0)
645 message = string_sprintf("%s: %s", message, strerror(addr->basic_errno));
646 log_write(0, LOG_MAIN, "%s", message);
647 deliver_msglog("%s %s\n", tod_stamp(tod_log), message);
648 }
649 else
650 {
651 const uschar * s = exim_errstr(addr->basic_errno);
652 log_write(0, LOG_MAIN, "%s %s", message, s);
653 deliver_msglog("%s %s %s\n", tod_stamp(tod_log), message, s);
654 }
655 }
656
657 static void
658 msglog_line(host_item * host, uschar * message)
659 {
660 deliver_msglog("%s H=%s [%s] %s\n", tod_stamp(tod_log),
661 host->name, host->address, message);
662 }
663
664
665
666 #ifndef DISABLE_EVENT
667 /*************************************************
668 * Post-defer action *
669 *************************************************/
670
671 /* This expands an arbitrary per-transport string.
672 It might, for example, be used to write to the database log.
673
674 Arguments:
675 addr the address item containing error information
676 host the current host
677
678 Returns: nothing
679 */
680
681 static void
682 deferred_event_raise(address_item *addr, host_item *host)
683 {
684 uschar * action = addr->transport->event_action;
685 const uschar * save_domain;
686 uschar * save_local;
687
688 if (!action)
689 return;
690
691 save_domain = deliver_domain;
692 save_local = deliver_localpart;
693
694 /*XXX would ip & port already be set up? */
695 deliver_host_address = string_copy(host->address);
696 deliver_host_port = host->port == PORT_NONE ? 25 : host->port;
697 event_defer_errno = addr->basic_errno;
698
699 router_name = addr->router->name;
700 transport_name = addr->transport->name;
701 deliver_domain = addr->domain;
702 deliver_localpart = addr->local_part;
703
704 (void) event_raise(action, US"msg:host:defer",
705 addr->message
706 ? addr->basic_errno > 0
707 ? string_sprintf("%s: %s", addr->message, strerror(addr->basic_errno))
708 : string_copy(addr->message)
709 : addr->basic_errno > 0
710 ? string_copy(US strerror(addr->basic_errno))
711 : NULL);
712
713 deliver_localpart = save_local;
714 deliver_domain = save_domain;
715 router_name = transport_name = NULL;
716 }
717 #endif
718
719 /*************************************************
720 * Synchronize SMTP responses *
721 *************************************************/
722
723 /* This function is called from smtp_deliver() to receive SMTP responses from
724 the server, and match them up with the commands to which they relate. When
725 PIPELINING is not in use, this function is called after every command, and is
726 therefore somewhat over-engineered, but it is simpler to use a single scheme
727 that works both with and without PIPELINING instead of having two separate sets
728 of code.
729
730 The set of commands that are buffered up with pipelining may start with MAIL
731 and may end with DATA; in between are RCPT commands that correspond to the
732 addresses whose status is PENDING_DEFER. All other commands (STARTTLS, AUTH,
733 etc.) are never buffered.
734
735 Errors after MAIL or DATA abort the whole process leaving the response in the
736 buffer. After MAIL, pending responses are flushed, and the original command is
737 re-instated in big_buffer for error messages. For RCPT commands, the remote is
738 permitted to reject some recipient addresses while accepting others. However
739 certain errors clearly abort the whole process. Set the value in
740 transport_return to PENDING_OK if the address is accepted. If there is a
741 subsequent general error, it will get reset accordingly. If not, it will get
742 converted to OK at the end.
743
744 Arguments:
745 addrlist the complete address list
746 include_affixes TRUE if affixes include in RCPT
747 sync_addr ptr to the ptr of the one to start scanning at (updated)
748 host the host we are connected to
749 count the number of responses to read
750 address_retry_
751 include_sender true if 4xx retry is to include the sender it its key
752 pending_MAIL true if the first response is for MAIL
753 pending_DATA 0 if last command sent was not DATA
754 +1 if previously had a good recipient
755 -1 if not previously had a good recipient
756 inblock incoming SMTP block
757 timeout timeout value
758 buffer buffer for reading response
759 buffsize size of buffer
760
761 Returns: 3 if at least one address had 2xx and one had 5xx
762 2 if at least one address had 5xx but none had 2xx
763 1 if at least one host had a 2xx response, but none had 5xx
764 0 no address had 2xx or 5xx but no errors (all 4xx, or just DATA)
765 -1 timeout while reading RCPT response
766 -2 I/O or other non-response error for RCPT
767 -3 DATA or MAIL failed - errno and buffer set
768 */
769
770 static int
771 sync_responses(address_item *addrlist, BOOL include_affixes,
772 address_item **sync_addr, host_item *host, int count,
773 BOOL address_retry_include_sender, BOOL pending_MAIL,
774 int pending_DATA, smtp_inblock *inblock, int timeout, uschar *buffer,
775 int buffsize)
776 {
777 address_item *addr = *sync_addr;
778 int yield = 0;
779
780 /* Handle the response for a MAIL command. On error, reinstate the original
781 command in big_buffer for error message use, and flush any further pending
782 responses before returning, except after I/O errors and timeouts. */
783
784 if (pending_MAIL)
785 {
786 count--;
787 if (!smtp_read_response(inblock, buffer, buffsize, '2', timeout))
788 {
789 Ustrcpy(big_buffer, mail_command); /* Fits, because it came from there! */
790 if (errno == 0 && buffer[0] != 0)
791 {
792 uschar flushbuffer[4096];
793 int save_errno = 0;
794 if (buffer[0] == '4')
795 {
796 save_errno = ERRNO_MAIL4XX;
797 addr->more_errno |= ((buffer[1] - '0')*10 + buffer[2] - '0') << 8;
798 }
799 while (count-- > 0)
800 {
801 if (!smtp_read_response(inblock, flushbuffer, sizeof(flushbuffer),
802 '2', timeout)
803 && (errno != 0 || flushbuffer[0] == 0))
804 break;
805 }
806 errno = save_errno;
807 }
808
809 if (pending_DATA) count--; /* Number of RCPT responses to come */
810 while (count-- > 0) /* Mark any pending addrs with the host used */
811 {
812 while (addr->transport_return != PENDING_DEFER) addr = addr->next;
813 addr->host_used = host;
814 addr = addr->next;
815 }
816 return -3;
817 }
818 }
819
820 if (pending_DATA) count--; /* Number of RCPT responses to come */
821
822 /* Read and handle the required number of RCPT responses, matching each one up
823 with an address by scanning for the next address whose status is PENDING_DEFER.
824 */
825
826 while (count-- > 0)
827 {
828 while (addr->transport_return != PENDING_DEFER) addr = addr->next;
829
830 /* The address was accepted */
831 addr->host_used = host;
832
833 if (smtp_read_response(inblock, buffer, buffsize, '2', timeout))
834 {
835 yield |= 1;
836 addr->transport_return = PENDING_OK;
837
838 /* If af_dr_retry_exists is set, there was a routing delay on this address;
839 ensure that any address-specific retry record is expunged. We do this both
840 for the basic key and for the version that also includes the sender. */
841
842 if (testflag(addr, af_dr_retry_exists))
843 {
844 uschar *altkey = string_sprintf("%s:<%s>", addr->address_retry_key,
845 sender_address);
846 retry_add_item(addr, altkey, rf_delete);
847 retry_add_item(addr, addr->address_retry_key, rf_delete);
848 }
849 }
850
851 /* Timeout while reading the response */
852
853 else if (errno == ETIMEDOUT)
854 {
855 uschar *message = string_sprintf("SMTP timeout after RCPT TO:<%s>",
856 transport_rcpt_address(addr, include_affixes));
857 set_errno_nohost(addrlist, ETIMEDOUT, message, DEFER, FALSE);
858 retry_add_item(addr, addr->address_retry_key, 0);
859 update_waiting = FALSE;
860 return -1;
861 }
862
863 /* Handle other errors in obtaining an SMTP response by returning -1. This
864 will cause all the addresses to be deferred. Restore the SMTP command in
865 big_buffer for which we are checking the response, so the error message
866 makes sense. */
867
868 else if (errno != 0 || buffer[0] == 0)
869 {
870 string_format(big_buffer, big_buffer_size, "RCPT TO:<%s>",
871 transport_rcpt_address(addr, include_affixes));
872 return -2;
873 }
874
875 /* Handle SMTP permanent and temporary response codes. */
876
877 else
878 {
879 addr->message =
880 string_sprintf("SMTP error from remote mail server after RCPT TO:<%s>: "
881 "%s", transport_rcpt_address(addr, include_affixes),
882 string_printing(buffer));
883 setflag(addr, af_pass_message);
884 msglog_line(host, addr->message);
885
886 /* The response was 5xx */
887
888 if (buffer[0] == '5')
889 {
890 addr->transport_return = FAIL;
891 yield |= 2;
892 }
893
894 /* The response was 4xx */
895
896 else
897 {
898 addr->transport_return = DEFER;
899 addr->basic_errno = ERRNO_RCPT4XX;
900 addr->more_errno |= ((buffer[1] - '0')*10 + buffer[2] - '0') << 8;
901
902 #ifndef DISABLE_EVENT
903 event_defer_errno = addr->more_errno;
904 msg_event_raise(US"msg:rcpt:host:defer", addr);
905 #endif
906
907 /* Log temporary errors if there are more hosts to be tried.
908 If not, log this last one in the == line. */
909
910 if (host->next)
911 log_write(0, LOG_MAIN, "H=%s [%s]: %s", host->name, host->address, addr->message);
912
913 #ifndef DISABLE_EVENT
914 else
915 msg_event_raise(US"msg:rcpt:defer", addr);
916 #endif
917
918 /* Do not put this message on the list of those waiting for specific
919 hosts, as otherwise it is likely to be tried too often. */
920
921 update_waiting = FALSE;
922
923 /* Add a retry item for the address so that it doesn't get tried again
924 too soon. If address_retry_include_sender is true, add the sender address
925 to the retry key. */
926
927 if (address_retry_include_sender)
928 {
929 uschar *altkey = string_sprintf("%s:<%s>", addr->address_retry_key,
930 sender_address);
931 retry_add_item(addr, altkey, 0);
932 }
933 else retry_add_item(addr, addr->address_retry_key, 0);
934 }
935 }
936 } /* Loop for next RCPT response */
937
938 /* Update where to start at for the next block of responses, unless we
939 have already handled all the addresses. */
940
941 if (addr != NULL) *sync_addr = addr->next;
942
943 /* Handle a response to DATA. If we have not had any good recipients, either
944 previously or in this block, the response is ignored. */
945
946 if (pending_DATA != 0 &&
947 !smtp_read_response(inblock, buffer, buffsize, '3', timeout))
948 {
949 int code;
950 uschar *msg;
951 BOOL pass_message;
952 if (pending_DATA > 0 || (yield & 1) != 0)
953 {
954 if (errno == 0 && buffer[0] == '4')
955 {
956 errno = ERRNO_DATA4XX;
957 addrlist->more_errno |= ((buffer[1] - '0')*10 + buffer[2] - '0') << 8;
958 }
959 return -3;
960 }
961 (void)check_response(host, &errno, 0, buffer, &code, &msg, &pass_message);
962 DEBUG(D_transport) debug_printf("%s\nerror for DATA ignored: pipelining "
963 "is in use and there were no good recipients\n", msg);
964 }
965
966 /* All responses read and handled; MAIL (if present) received 2xx and DATA (if
967 present) received 3xx. If any RCPTs were handled and yielded anything other
968 than 4xx, yield will be set non-zero. */
969
970 return yield;
971 }
972
973
974
975 /* Do the client side of smtp-level authentication */
976 /*
977 Arguments:
978 buffer EHLO response from server (gets overwritten)
979 addrlist chain of potential addresses to deliver
980 host host to deliver to
981 ob transport options
982 ibp, obp comms channel control blocks
983
984 Returns:
985 OK Success, or failed (but not required): global "smtp_authenticated" set
986 DEFER Failed authentication (and was required)
987 ERROR Internal problem
988
989 FAIL_SEND Failed communications - transmit
990 FAIL - response
991 */
992
993 int
994 smtp_auth(uschar *buffer, unsigned bufsize, address_item *addrlist, host_item *host,
995 smtp_transport_options_block *ob, BOOL is_esmtp,
996 smtp_inblock *ibp, smtp_outblock *obp)
997 {
998 int require_auth;
999 uschar *fail_reason = US"server did not advertise AUTH support";
1000
1001 smtp_authenticated = FALSE;
1002 client_authenticator = client_authenticated_id = client_authenticated_sender = NULL;
1003 require_auth = verify_check_given_host(&ob->hosts_require_auth, host);
1004
1005 if (is_esmtp && !regex_AUTH) regex_AUTH =
1006 regex_must_compile(US"\\n250[\\s\\-]AUTH\\s+([\\-\\w\\s]+)(?:\\n|$)",
1007 FALSE, TRUE);
1008
1009 if (is_esmtp && regex_match_and_setup(regex_AUTH, buffer, 0, -1))
1010 {
1011 uschar *names = string_copyn(expand_nstring[1], expand_nlength[1]);
1012 expand_nmax = -1; /* reset */
1013
1014 /* Must not do this check until after we have saved the result of the
1015 regex match above. */
1016
1017 if (require_auth == OK ||
1018 verify_check_given_host(&ob->hosts_try_auth, host) == OK)
1019 {
1020 auth_instance *au;
1021 fail_reason = US"no common mechanisms were found";
1022
1023 DEBUG(D_transport) debug_printf("scanning authentication mechanisms\n");
1024
1025 /* Scan the configured authenticators looking for one which is configured
1026 for use as a client, which is not suppressed by client_condition, and
1027 whose name matches an authentication mechanism supported by the server.
1028 If one is found, attempt to authenticate by calling its client function.
1029 */
1030
1031 for (au = auths; !smtp_authenticated && au != NULL; au = au->next)
1032 {
1033 uschar *p = names;
1034 if (!au->client ||
1035 (au->client_condition != NULL &&
1036 !expand_check_condition(au->client_condition, au->name,
1037 US"client authenticator")))
1038 {
1039 DEBUG(D_transport) debug_printf("skipping %s authenticator: %s\n",
1040 au->name,
1041 (au->client)? "client_condition is false" :
1042 "not configured as a client");
1043 continue;
1044 }
1045
1046 /* Loop to scan supported server mechanisms */
1047
1048 while (*p != 0)
1049 {
1050 int rc;
1051 int len = Ustrlen(au->public_name);
1052 while (isspace(*p)) p++;
1053
1054 if (strncmpic(au->public_name, p, len) != 0 ||
1055 (p[len] != 0 && !isspace(p[len])))
1056 {
1057 while (*p != 0 && !isspace(*p)) p++;
1058 continue;
1059 }
1060
1061 /* Found data for a listed mechanism. Call its client entry. Set
1062 a flag in the outblock so that data is overwritten after sending so
1063 that reflections don't show it. */
1064
1065 fail_reason = US"authentication attempt(s) failed";
1066 obp->authenticating = TRUE;
1067 rc = (au->info->clientcode)(au, ibp, obp,
1068 ob->command_timeout, buffer, bufsize);
1069 obp->authenticating = FALSE;
1070 DEBUG(D_transport) debug_printf("%s authenticator yielded %d\n",
1071 au->name, rc);
1072
1073 /* A temporary authentication failure must hold up delivery to
1074 this host. After a permanent authentication failure, we carry on
1075 to try other authentication methods. If all fail hard, try to
1076 deliver the message unauthenticated unless require_auth was set. */
1077
1078 switch(rc)
1079 {
1080 case OK:
1081 smtp_authenticated = TRUE; /* stops the outer loop */
1082 client_authenticator = au->name;
1083 if (au->set_client_id != NULL)
1084 client_authenticated_id = expand_string(au->set_client_id);
1085 break;
1086
1087 /* Failure after writing a command */
1088
1089 case FAIL_SEND:
1090 return FAIL_SEND;
1091
1092 /* Failure after reading a response */
1093
1094 case FAIL:
1095 if (errno != 0 || buffer[0] != '5') return FAIL;
1096 log_write(0, LOG_MAIN, "%s authenticator failed H=%s [%s] %s",
1097 au->name, host->name, host->address, buffer);
1098 break;
1099
1100 /* Failure by some other means. In effect, the authenticator
1101 decided it wasn't prepared to handle this case. Typically this
1102 is the result of "fail" in an expansion string. Do we need to
1103 log anything here? Feb 2006: a message is now put in the buffer
1104 if logging is required. */
1105
1106 case CANCELLED:
1107 if (*buffer != 0)
1108 log_write(0, LOG_MAIN, "%s authenticator cancelled "
1109 "authentication H=%s [%s] %s", au->name, host->name,
1110 host->address, buffer);
1111 break;
1112
1113 /* Internal problem, message in buffer. */
1114
1115 case ERROR:
1116 set_errno_nohost(addrlist, ERRNO_AUTHPROB, string_copy(buffer),
1117 DEFER, FALSE);
1118 return ERROR;
1119 }
1120
1121 break; /* If not authenticated, try next authenticator */
1122 } /* Loop for scanning supported server mechanisms */
1123 } /* Loop for further authenticators */
1124 }
1125 }
1126
1127 /* If we haven't authenticated, but are required to, give up. */
1128
1129 if (require_auth == OK && !smtp_authenticated)
1130 {
1131 set_errno_nohost(addrlist, ERRNO_AUTHFAIL,
1132 string_sprintf("authentication required but %s", fail_reason), DEFER,
1133 FALSE);
1134 return DEFER;
1135 }
1136
1137 return OK;
1138 }
1139
1140
1141 /* Construct AUTH appendix string for MAIL TO */
1142 /*
1143 Arguments
1144 buffer to build string
1145 addrlist chain of potential addresses to deliver
1146 ob transport options
1147
1148 Globals smtp_authenticated
1149 client_authenticated_sender
1150 Return True on error, otherwise buffer has (possibly empty) terminated string
1151 */
1152
1153 BOOL
1154 smtp_mail_auth_str(uschar *buffer, unsigned bufsize, address_item *addrlist,
1155 smtp_transport_options_block *ob)
1156 {
1157 uschar *local_authenticated_sender = authenticated_sender;
1158
1159 #ifdef notdef
1160 debug_printf("smtp_mail_auth_str: as<%s> os<%s> SA<%s>\n", authenticated_sender, ob->authenticated_sender, smtp_authenticated?"Y":"N");
1161 #endif
1162
1163 if (ob->authenticated_sender != NULL)
1164 {
1165 uschar *new = expand_string(ob->authenticated_sender);
1166 if (new == NULL)
1167 {
1168 if (!expand_string_forcedfail)
1169 {
1170 uschar *message = string_sprintf("failed to expand "
1171 "authenticated_sender: %s", expand_string_message);
1172 set_errno_nohost(addrlist, ERRNO_EXPANDFAIL, message, DEFER, FALSE);
1173 return TRUE;
1174 }
1175 }
1176 else if (new[0] != 0) local_authenticated_sender = new;
1177 }
1178
1179 /* Add the authenticated sender address if present */
1180
1181 if ((smtp_authenticated || ob->authenticated_sender_force) &&
1182 local_authenticated_sender != NULL)
1183 {
1184 string_format(buffer, bufsize, " AUTH=%s",
1185 auth_xtextencode(local_authenticated_sender,
1186 Ustrlen(local_authenticated_sender)));
1187 client_authenticated_sender = string_copy(local_authenticated_sender);
1188 }
1189 else
1190 *buffer= 0;
1191
1192 return FALSE;
1193 }
1194
1195
1196
1197 #ifdef EXPERIMENTAL_DANE
1198 /* Lookup TLSA record for host/port.
1199 Return: OK success with dnssec; DANE mode
1200 DEFER Do not use this host now, may retry later
1201 FAIL_FORCED No TLSA record; DANE not usable
1202 FAIL Do not use this connection
1203 */
1204
1205 int
1206 tlsa_lookup(const host_item * host, dns_answer * dnsa, BOOL dane_required)
1207 {
1208 /* move this out to host.c given the similarity to dns_lookup() ? */
1209 uschar buffer[300];
1210 const uschar * fullname = buffer;
1211
1212 /* TLSA lookup string */
1213 (void)sprintf(CS buffer, "_%d._tcp.%.256s", host->port, host->name);
1214
1215 switch (dns_lookup(dnsa, buffer, T_TLSA, &fullname))
1216 {
1217 case DNS_SUCCEED:
1218 if (!dns_is_secure(dnsa))
1219 {
1220 log_write(0, LOG_MAIN, "DANE error: TLSA lookup not DNSSEC");
1221 return DEFER;
1222 }
1223 return OK;
1224
1225 case DNS_AGAIN:
1226 return DEFER; /* just defer this TLS'd conn */
1227
1228 case DNS_NOMATCH:
1229 return dane_required ? FAIL : FAIL_FORCED;
1230
1231 default:
1232 case DNS_FAIL:
1233 return dane_required ? FAIL : DEFER;
1234 }
1235 }
1236 #endif
1237
1238
1239
1240 typedef struct smtp_compare_s
1241 {
1242 uschar *current_sender_address;
1243 struct transport_instance *tblock;
1244 } smtp_compare_t;
1245
1246 /*
1247 Create a unique string that identifies this message, it is based on
1248 sender_address, helo_data and tls_certificate if enabled. */
1249
1250 static uschar *
1251 smtp_local_identity(uschar * sender, struct transport_instance * tblock)
1252 {
1253 address_item * addr1;
1254 uschar * if1 = US"";
1255 uschar * helo1 = US"";
1256 #ifdef SUPPORT_TLS
1257 uschar * tlsc1 = US"";
1258 #endif
1259 uschar * save_sender_address = sender_address;
1260 uschar * local_identity = NULL;
1261 smtp_transport_options_block * ob =
1262 (smtp_transport_options_block *)tblock->options_block;
1263
1264 sender_address = sender;
1265
1266 addr1 = deliver_make_addr (sender, TRUE);
1267 deliver_set_expansions(addr1);
1268
1269 if (ob->interface)
1270 if1 = expand_string(ob->interface);
1271
1272 if (ob->helo_data)
1273 helo1 = expand_string(ob->helo_data);
1274
1275 #ifdef SUPPORT_TLS
1276 if (ob->tls_certificate)
1277 tlsc1 = expand_string(ob->tls_certificate);
1278 local_identity = string_sprintf ("%s^%s^%s", if1, helo1, tlsc1);
1279 #else
1280 local_identity = string_sprintf ("%s^%s", if1, helo1);
1281 #endif
1282
1283 deliver_set_expansions(NULL);
1284 sender_address = save_sender_address;
1285
1286 return local_identity;
1287 }
1288
1289
1290
1291 /* This routine is a callback that is called from transport_check_waiting.
1292 This function will evaluate the incoming message versus the previous
1293 message. If the incoming message is using a different local identity then
1294 we will veto this new message. */
1295
1296 static BOOL
1297 smtp_are_same_identities(uschar * message_id, smtp_compare_t * s_compare)
1298 {
1299 uschar * message_local_identity,
1300 * current_local_identity,
1301 * new_sender_address;
1302
1303 current_local_identity =
1304 smtp_local_identity(s_compare->current_sender_address, s_compare->tblock);
1305
1306 if (!(new_sender_address = deliver_get_sender_address(message_id)))
1307 return 0;
1308
1309 message_local_identity =
1310 smtp_local_identity(new_sender_address, s_compare->tblock);
1311
1312 return Ustrcmp(current_local_identity, message_local_identity) == 0;
1313 }
1314
1315
1316
1317 uschar
1318 ehlo_response(uschar * buf, size_t bsize, uschar checks)
1319 {
1320 #ifdef SUPPORT_TLS
1321 if ( checks & PEER_OFFERED_TLS
1322 && pcre_exec(regex_STARTTLS, NULL, CS buf, bsize, 0, PCRE_EOPT, NULL, 0) < 0)
1323 checks &= ~PEER_OFFERED_TLS;
1324 #endif
1325
1326 if ( checks & PEER_OFFERED_IGNQ
1327 && pcre_exec(regex_IGNOREQUOTA, NULL, CS buf, bsize, 0,
1328 PCRE_EOPT, NULL, 0) < 0)
1329 checks &= ~PEER_OFFERED_IGNQ;
1330
1331 if ( checks & PEER_OFFERED_CHUNKING
1332 && pcre_exec(regex_CHUNKING, NULL, CS buf, bsize, 0, PCRE_EOPT, NULL, 0) < 0)
1333 checks &= ~PEER_OFFERED_CHUNKING;
1334
1335 #ifndef DISABLE_PRDR
1336 if ( checks & PEER_OFFERED_PRDR
1337 && pcre_exec(regex_PRDR, NULL, CS buf, bsize, 0, PCRE_EOPT, NULL, 0) < 0)
1338 checks &= ~PEER_OFFERED_PRDR;
1339 #endif
1340
1341 #ifdef SUPPORT_I18N
1342 if ( checks & PEER_OFFERED_UTF8
1343 && pcre_exec(regex_UTF8, NULL, CS buf, bsize, 0, PCRE_EOPT, NULL, 0) < 0)
1344 checks &= ~PEER_OFFERED_UTF8;
1345 #endif
1346
1347 if ( checks & PEER_OFFERED_DSN
1348 && pcre_exec(regex_DSN, NULL, CS buf, bsize, 0, PCRE_EOPT, NULL, 0) < 0)
1349 checks &= ~PEER_OFFERED_DSN;
1350
1351 if ( checks & PEER_OFFERED_PIPE
1352 && pcre_exec(regex_PIPELINING, NULL, CS buf, bsize, 0,
1353 PCRE_EOPT, NULL, 0) < 0)
1354 checks &= ~PEER_OFFERED_PIPE;
1355
1356 if ( checks & PEER_OFFERED_SIZE
1357 && pcre_exec(regex_SIZE, NULL, CS buf, bsize, 0, PCRE_EOPT, NULL, 0) < 0)
1358 checks &= ~PEER_OFFERED_SIZE;
1359
1360 return checks;
1361 }
1362
1363
1364 /*************************************************
1365 * Deliver address list to given host *
1366 *************************************************/
1367
1368 /* If continue_hostname is not null, we get here only when continuing to
1369 deliver down an existing channel. The channel was passed as the standard
1370 input. TLS is never active on a passed channel; the previous process always
1371 closes it down before passing the connection on.
1372
1373 Otherwise, we have to make a connection to the remote host, and do the
1374 initial protocol exchange.
1375
1376 When running as an MUA wrapper, if the sender or any recipient is rejected,
1377 temporarily or permanently, we force failure for all recipients.
1378
1379 Arguments:
1380 addrlist chain of potential addresses to deliver; only those whose
1381 transport_return field is set to PENDING_DEFER are currently
1382 being processed; others should be skipped - they have either
1383 been delivered to an earlier host or IP address, or been
1384 failed by one of them.
1385 host host to deliver to
1386 host_af AF_INET or AF_INET6
1387 port default TCP/IP port to use, in host byte order
1388 interface interface to bind to, or NULL
1389 tblock transport instance block
1390 message_defer set TRUE if yield is OK, but all addresses were deferred
1391 because of a non-recipient, non-host failure, that is, a
1392 4xx response to MAIL FROM, DATA, or ".". This is a defer
1393 that is specific to the message.
1394 suppress_tls if TRUE, don't attempt a TLS connection - this is set for
1395 a second attempt after TLS initialization fails
1396
1397 Returns: OK - the connection was made and the delivery attempted;
1398 the result for each address is in its data block.
1399 DEFER - the connection could not be made, or something failed
1400 while setting up the SMTP session, or there was a
1401 non-message-specific error, such as a timeout.
1402 ERROR - a filter command is specified for this transport,
1403 and there was a problem setting it up; OR helo_data
1404 or add_headers or authenticated_sender is specified
1405 for this transport, and the string failed to expand
1406 */
1407
1408 static int
1409 smtp_deliver(address_item *addrlist, host_item *host, int host_af, int port,
1410 uschar *interface, transport_instance *tblock,
1411 BOOL *message_defer, BOOL suppress_tls)
1412 {
1413 address_item *addr;
1414 address_item *sync_addr;
1415 address_item *first_addr = addrlist;
1416 int yield = OK;
1417 int address_count;
1418 int save_errno;
1419 int rc;
1420 time_t start_delivery_time = time(NULL);
1421 smtp_transport_options_block *ob =
1422 (smtp_transport_options_block *)(tblock->options_block);
1423 BOOL lmtp = strcmpic(ob->protocol, US"lmtp") == 0;
1424 BOOL smtps = strcmpic(ob->protocol, US"smtps") == 0;
1425 BOOL ok = FALSE;
1426 BOOL send_rset = TRUE;
1427 BOOL send_quit = TRUE;
1428 BOOL setting_up = TRUE;
1429 BOOL completed_address = FALSE;
1430 BOOL esmtp = TRUE;
1431 BOOL pending_MAIL;
1432 BOOL pass_message = FALSE;
1433 uschar peer_offered = 0; /*XXX should this be handed on cf. tls_offered, smtp_use_dsn ? */
1434 #ifndef DISABLE_PRDR
1435 BOOL prdr_active;
1436 #endif
1437 #ifdef SUPPORT_I18N
1438 BOOL utf8_needed = FALSE;
1439 #endif
1440 BOOL dsn_all_lasthop = TRUE;
1441 #if defined(SUPPORT_TLS) && defined(EXPERIMENTAL_DANE)
1442 BOOL dane = FALSE;
1443 BOOL dane_required = verify_check_given_host(&ob->hosts_require_dane, host) == OK;
1444 dns_answer tlsa_dnsa;
1445 #endif
1446 smtp_inblock inblock;
1447 smtp_outblock outblock;
1448 int max_rcpt = tblock->max_addresses;
1449 uschar *igquotstr = US"";
1450
1451 #ifdef EXPERIMENTAL_DSN_INFO
1452 uschar *smtp_greeting = NULL;
1453 uschar *helo_response = NULL;
1454 #endif
1455 uschar *helo_data = NULL;
1456
1457 uschar *message = NULL;
1458 uschar new_message_id[MESSAGE_ID_LENGTH + 1];
1459 uschar *p;
1460 uschar buffer[4096];
1461 uschar inbuffer[4096];
1462 uschar outbuffer[4096];
1463
1464 suppress_tls = suppress_tls; /* stop compiler warning when no TLS support */
1465
1466 *message_defer = FALSE;
1467 smtp_command = US"initial connection";
1468 if (max_rcpt == 0) max_rcpt = 999999;
1469
1470 /* Set up the buffer for reading SMTP response packets. */
1471
1472 inblock.buffer = inbuffer;
1473 inblock.buffersize = sizeof(inbuffer);
1474 inblock.ptr = inbuffer;
1475 inblock.ptrend = inbuffer;
1476
1477 /* Set up the buffer for holding SMTP commands while pipelining */
1478
1479 outblock.buffer = outbuffer;
1480 outblock.buffersize = sizeof(outbuffer);
1481 outblock.ptr = outbuffer;
1482 outblock.cmd_count = 0;
1483 outblock.authenticating = FALSE;
1484
1485 /* Reset the parameters of a TLS session. */
1486
1487 tls_out.bits = 0;
1488 tls_out.cipher = NULL; /* the one we may use for this transport */
1489 tls_out.ourcert = NULL;
1490 tls_out.peercert = NULL;
1491 tls_out.peerdn = NULL;
1492 #if defined(SUPPORT_TLS) && !defined(USE_GNUTLS)
1493 tls_out.sni = NULL;
1494 #endif
1495 tls_out.ocsp = OCSP_NOT_REQ;
1496
1497 /* Flip the legacy TLS-related variables over to the outbound set in case
1498 they're used in the context of the transport. Don't bother resetting
1499 afterward as we're in a subprocess. */
1500
1501 tls_modify_variables(&tls_out);
1502
1503 #ifndef SUPPORT_TLS
1504 if (smtps)
1505 {
1506 set_errno_nohost(addrlist, ERRNO_TLSFAILURE, US"TLS support not available",
1507 DEFER, FALSE);
1508 return ERROR;
1509 }
1510 #endif
1511
1512 /* Make a connection to the host if this isn't a continued delivery, and handle
1513 the initial interaction and HELO/EHLO/LHLO. Connect timeout errors are handled
1514 specially so they can be identified for retries. */
1515
1516 if (continue_hostname == NULL)
1517 {
1518 /* This puts port into host->port */
1519 inblock.sock = outblock.sock =
1520 smtp_connect(host, host_af, port, interface, ob->connect_timeout, tblock);
1521
1522 if (inblock.sock < 0)
1523 {
1524 set_errno_nohost(addrlist, (errno == ETIMEDOUT)? ERRNO_CONNECTTIMEOUT : errno,
1525 NULL, DEFER, FALSE);
1526 return DEFER;
1527 }
1528
1529 #if defined(SUPPORT_TLS) && defined(EXPERIMENTAL_DANE)
1530 {
1531 tls_out.dane_verified = FALSE;
1532 tls_out.tlsa_usage = 0;
1533
1534 if (host->dnssec == DS_YES)
1535 {
1536 if( dane_required
1537 || verify_check_given_host(&ob->hosts_try_dane, host) == OK
1538 )
1539 switch (rc = tlsa_lookup(host, &tlsa_dnsa, dane_required))
1540 {
1541 case OK: dane = TRUE; break;
1542 case FAIL_FORCED: break;
1543 default: set_errno_nohost(addrlist, ERRNO_DNSDEFER,
1544 string_sprintf("DANE error: tlsa lookup %s",
1545 rc == DEFER ? "DEFER" : "FAIL"),
1546 rc, FALSE);
1547 return rc;
1548 }
1549 }
1550 else if (dane_required)
1551 {
1552 set_errno_nohost(addrlist, ERRNO_DNSDEFER,
1553 string_sprintf("DANE error: %s lookup not DNSSEC", host->name),
1554 FAIL, FALSE);
1555 return FAIL;
1556 }
1557
1558 if (dane)
1559 ob->tls_tempfail_tryclear = FALSE;
1560 }
1561 #endif /*DANE*/
1562
1563 /* Expand the greeting message while waiting for the initial response. (Makes
1564 sense if helo_data contains ${lookup dnsdb ...} stuff). The expansion is
1565 delayed till here so that $sending_interface and $sending_port are set. */
1566
1567 helo_data = expand_string(ob->helo_data);
1568 #ifdef SUPPORT_I18N
1569 if (helo_data)
1570 {
1571 uschar * errstr = NULL;
1572 if ((helo_data = string_domain_utf8_to_alabel(helo_data, &errstr)), errstr)
1573 {
1574 errstr = string_sprintf("failed to expand helo_data: %s", errstr);
1575 set_errno_nohost(addrlist, ERRNO_EXPANDFAIL, errstr, DEFER, FALSE);
1576 yield = DEFER;
1577 goto SEND_QUIT;
1578 }
1579 }
1580 #endif
1581
1582 /* The first thing is to wait for an initial OK response. The dreaded "goto"
1583 is nevertheless a reasonably clean way of programming this kind of logic,
1584 where you want to escape on any error. */
1585
1586 if (!smtps)
1587 {
1588 BOOL good_response = smtp_read_response(&inblock, buffer, sizeof(buffer),
1589 '2', ob->command_timeout);
1590 #ifdef EXPERIMENTAL_DSN_INFO
1591 smtp_greeting = string_copy(buffer);
1592 #endif
1593 if (!good_response) goto RESPONSE_FAILED;
1594
1595 #ifndef DISABLE_EVENT
1596 {
1597 uschar * s;
1598 lookup_dnssec_authenticated = host->dnssec==DS_YES ? US"yes"
1599 : host->dnssec==DS_NO ? US"no" : NULL;
1600 s = event_raise(tblock->event_action, US"smtp:connect", buffer);
1601 if (s)
1602 {
1603 set_errno_nohost(addrlist, ERRNO_EXPANDFAIL,
1604 string_sprintf("deferred by smtp:connect event expansion: %s", s),
1605 DEFER, FALSE);
1606 yield = DEFER;
1607 goto SEND_QUIT;
1608 }
1609 }
1610 #endif
1611
1612 /* Now check if the helo_data expansion went well, and sign off cleanly if
1613 it didn't. */
1614
1615 if (helo_data == NULL)
1616 {
1617 uschar *message = string_sprintf("failed to expand helo_data: %s",
1618 expand_string_message);
1619 set_errno_nohost(addrlist, ERRNO_EXPANDFAIL, message, DEFER, FALSE);
1620 yield = DEFER;
1621 goto SEND_QUIT;
1622 }
1623 }
1624
1625 /** Debugging without sending a message
1626 addrlist->transport_return = DEFER;
1627 goto SEND_QUIT;
1628 **/
1629
1630 /* Errors that occur after this point follow an SMTP command, which is
1631 left in big_buffer by smtp_write_command() for use in error messages. */
1632
1633 smtp_command = big_buffer;
1634
1635 /* Tell the remote who we are...
1636
1637 February 1998: A convention has evolved that ESMTP-speaking MTAs include the
1638 string "ESMTP" in their greeting lines, so make Exim send EHLO if the
1639 greeting is of this form. The assumption was that the far end supports it
1640 properly... but experience shows that there are some that give 5xx responses,
1641 even though the banner includes "ESMTP" (there's a bloody-minded one that
1642 says "ESMTP not spoken here"). Cope with that case.
1643
1644 September 2000: Time has passed, and it seems reasonable now to always send
1645 EHLO at the start. It is also convenient to make the change while installing
1646 the TLS stuff.
1647
1648 July 2003: Joachim Wieland met a broken server that advertises "PIPELINING"
1649 but times out after sending MAIL FROM, RCPT TO and DATA all together. There
1650 would be no way to send out the mails, so there is now a host list
1651 "hosts_avoid_esmtp" that disables ESMTP for special hosts and solves the
1652 PIPELINING problem as well. Maybe it can also be useful to cure other
1653 problems with broken servers.
1654
1655 Exim originally sent "Helo" at this point and ran for nearly a year that way.
1656 Then somebody tried it with a Microsoft mailer... It seems that all other
1657 mailers use upper case for some reason (the RFC is quite clear about case
1658 independence) so, for peace of mind, I gave in. */
1659
1660 esmtp = verify_check_given_host(&ob->hosts_avoid_esmtp, host) != OK;
1661
1662 /* Alas; be careful, since this goto is not an error-out, so conceivably
1663 we might set data between here and the target which we assume to exist
1664 and be usable. I can see this coming back to bite us. */
1665 #ifdef SUPPORT_TLS
1666 if (smtps)
1667 {
1668 tls_offered = TRUE;
1669 suppress_tls = FALSE;
1670 ob->tls_tempfail_tryclear = FALSE;
1671 smtp_command = US"SSL-on-connect";
1672 goto TLS_NEGOTIATE;
1673 }
1674 #endif
1675
1676 if (esmtp)
1677 {
1678 if (smtp_write_command(&outblock, FALSE, "%s %s\r\n",
1679 lmtp? "LHLO" : "EHLO", helo_data) < 0)
1680 goto SEND_FAILED;
1681 if (!smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
1682 ob->command_timeout))
1683 {
1684 if (errno != 0 || buffer[0] == 0 || lmtp)
1685 {
1686 #ifdef EXPERIMENTAL_DSN_INFO
1687 helo_response = string_copy(buffer);
1688 #endif
1689 goto RESPONSE_FAILED;
1690 }
1691 esmtp = FALSE;
1692 }
1693 #ifdef EXPERIMENTAL_DSN_INFO
1694 helo_response = string_copy(buffer);
1695 #endif
1696 }
1697 else
1698 {
1699 DEBUG(D_transport)
1700 debug_printf("not sending EHLO (host matches hosts_avoid_esmtp)\n");
1701 }
1702
1703 if (!esmtp)
1704 {
1705 BOOL good_response;
1706
1707 if (smtp_write_command(&outblock, FALSE, "HELO %s\r\n", helo_data) < 0)
1708 goto SEND_FAILED;
1709 good_response = smtp_read_response(&inblock, buffer, sizeof(buffer),
1710 '2', ob->command_timeout);
1711 #ifdef EXPERIMENTAL_DSN_INFO
1712 helo_response = string_copy(buffer);
1713 #endif
1714 if (!good_response) goto RESPONSE_FAILED;
1715 }
1716
1717 if (esmtp || lmtp)
1718 peer_offered = ehlo_response(buffer, Ustrlen(buffer),
1719 PEER_OFFERED_TLS /* others checked later */
1720 );
1721
1722 /* Set tls_offered if the response to EHLO specifies support for STARTTLS. */
1723
1724 #ifdef SUPPORT_TLS
1725 tls_offered = !!(peer_offered & PEER_OFFERED_TLS);
1726 #endif
1727 }
1728
1729 /* For continuing deliveries down the same channel, the socket is the standard
1730 input, and we don't need to redo EHLO here (but may need to do so for TLS - see
1731 below). Set up the pointer to where subsequent commands will be left, for
1732 error messages. Note that smtp_use_size and smtp_use_pipelining will have been
1733 set from the command line if they were set in the process that passed the
1734 connection on. */
1735
1736 /*XXX continue case needs to propagate DSN_INFO, prob. in deliver.c
1737 as the contine goes via transport_pass_socket() and doublefork and exec.
1738 It does not wait. Unclear how we keep separate host's responses
1739 separate - we could match up by host ip+port as a bodge. */
1740
1741 else
1742 {
1743 inblock.sock = outblock.sock = fileno(stdin);
1744 smtp_command = big_buffer;
1745 host->port = port; /* Record the port that was used */
1746 }
1747
1748 /* If TLS is available on this connection, whether continued or not, attempt to
1749 start up a TLS session, unless the host is in hosts_avoid_tls. If successful,
1750 send another EHLO - the server may give a different answer in secure mode. We
1751 use a separate buffer for reading the response to STARTTLS so that if it is
1752 negative, the original EHLO data is available for subsequent analysis, should
1753 the client not be required to use TLS. If the response is bad, copy the buffer
1754 for error analysis. */
1755
1756 #ifdef SUPPORT_TLS
1757 if ( tls_offered
1758 && !suppress_tls
1759 && verify_check_given_host(&ob->hosts_avoid_tls, host) != OK)
1760 {
1761 uschar buffer2[4096];
1762 if (smtp_write_command(&outblock, FALSE, "STARTTLS\r\n") < 0)
1763 goto SEND_FAILED;
1764
1765 /* If there is an I/O error, transmission of this message is deferred. If
1766 there is a temporary rejection of STARRTLS and tls_tempfail_tryclear is
1767 false, we also defer. However, if there is a temporary rejection of STARTTLS
1768 and tls_tempfail_tryclear is true, or if there is an outright rejection of
1769 STARTTLS, we carry on. This means we will try to send the message in clear,
1770 unless the host is in hosts_require_tls (tested below). */
1771
1772 if (!smtp_read_response(&inblock, buffer2, sizeof(buffer2), '2',
1773 ob->command_timeout))
1774 {
1775 if ( errno != 0
1776 || buffer2[0] == 0
1777 || (buffer2[0] == '4' && !ob->tls_tempfail_tryclear)
1778 )
1779 {
1780 Ustrncpy(buffer, buffer2, sizeof(buffer));
1781 goto RESPONSE_FAILED;
1782 }
1783 }
1784
1785 /* STARTTLS accepted: try to negotiate a TLS session. */
1786
1787 else
1788 TLS_NEGOTIATE:
1789 {
1790 int rc = tls_client_start(inblock.sock, host, addrlist, tblock
1791 # ifdef EXPERIMENTAL_DANE
1792 , dane ? &tlsa_dnsa : NULL
1793 # endif
1794 );
1795
1796 /* TLS negotiation failed; give an error. From outside, this function may
1797 be called again to try in clear on a new connection, if the options permit
1798 it for this host. */
1799
1800 if (rc != OK)
1801 {
1802 # ifdef EXPERIMENTAL_DANE
1803 if (rc == DEFER && dane)
1804 {
1805 log_write(0, LOG_MAIN,
1806 "DANE attempt failed; no TLS connection to %s [%s]",
1807 host->name, host->address);
1808 }
1809 # endif
1810
1811 save_errno = ERRNO_TLSFAILURE;
1812 message = US"failure while setting up TLS session";
1813 send_quit = FALSE;
1814 goto TLS_FAILED;
1815 }
1816
1817 /* TLS session is set up */
1818
1819 for (addr = addrlist; addr; addr = addr->next)
1820 if (addr->transport_return == PENDING_DEFER)
1821 {
1822 addr->cipher = tls_out.cipher;
1823 addr->ourcert = tls_out.ourcert;
1824 addr->peercert = tls_out.peercert;
1825 addr->peerdn = tls_out.peerdn;
1826 addr->ocsp = tls_out.ocsp;
1827 }
1828 }
1829 }
1830
1831 /* if smtps, we'll have smtp_command set to something else; always safe to
1832 reset it here. */
1833 smtp_command = big_buffer;
1834
1835 /* If we started TLS, redo the EHLO/LHLO exchange over the secure channel. If
1836 helo_data is null, we are dealing with a connection that was passed from
1837 another process, and so we won't have expanded helo_data above. We have to
1838 expand it here. $sending_ip_address and $sending_port are set up right at the
1839 start of the Exim process (in exim.c). */
1840
1841 if (tls_out.active >= 0)
1842 {
1843 char *greeting_cmd;
1844 BOOL good_response;
1845
1846 if (helo_data == NULL)
1847 {
1848 helo_data = expand_string(ob->helo_data);
1849 if (helo_data == NULL)
1850 {
1851 uschar *message = string_sprintf("failed to expand helo_data: %s",
1852 expand_string_message);
1853 set_errno_nohost(addrlist, ERRNO_EXPANDFAIL, message, DEFER, FALSE);
1854 yield = DEFER;
1855 goto SEND_QUIT;
1856 }
1857 }
1858
1859 /* For SMTPS we need to wait for the initial OK response. */
1860 if (smtps)
1861 {
1862 good_response = smtp_read_response(&inblock, buffer, sizeof(buffer),
1863 '2', ob->command_timeout);
1864 #ifdef EXPERIMENTAL_DSN_INFO
1865 smtp_greeting = string_copy(buffer);
1866 #endif
1867 if (!good_response) goto RESPONSE_FAILED;
1868 }
1869
1870 if (esmtp)
1871 greeting_cmd = "EHLO";
1872 else
1873 {
1874 greeting_cmd = "HELO";
1875 DEBUG(D_transport)
1876 debug_printf("not sending EHLO (host matches hosts_avoid_esmtp)\n");
1877 }
1878
1879 if (smtp_write_command(&outblock, FALSE, "%s %s\r\n",
1880 lmtp? "LHLO" : greeting_cmd, helo_data) < 0)
1881 goto SEND_FAILED;
1882 good_response = smtp_read_response(&inblock, buffer, sizeof(buffer),
1883 '2', ob->command_timeout);
1884 #ifdef EXPERIMENTAL_DSN_INFO
1885 helo_response = string_copy(buffer);
1886 #endif
1887 if (!good_response) goto RESPONSE_FAILED;
1888 }
1889
1890 /* If the host is required to use a secure channel, ensure that we
1891 have one. */
1892
1893 else if ( smtps
1894 # ifdef EXPERIMENTAL_DANE
1895 || dane
1896 # endif
1897 || verify_check_given_host(&ob->hosts_require_tls, host) == OK
1898 )
1899 {
1900 save_errno = ERRNO_TLSREQUIRED;
1901 message = string_sprintf("a TLS session is required, but %s",
1902 tls_offered ? "an attempt to start TLS failed"
1903 : "the server did not offer TLS support");
1904 goto TLS_FAILED;
1905 }
1906 #endif /*SUPPORT_TLS*/
1907
1908 /* If TLS is active, we have just started it up and re-done the EHLO command,
1909 so its response needs to be analyzed. If TLS is not active and this is a
1910 continued session down a previously-used socket, we haven't just done EHLO, so
1911 we skip this. */
1912
1913 if (continue_hostname == NULL
1914 #ifdef SUPPORT_TLS
1915 || tls_out.active >= 0
1916 #endif
1917 )
1918 {
1919 if (esmtp || lmtp)
1920 peer_offered = ehlo_response(buffer, Ustrlen(buffer),
1921 0 /* no TLS */
1922 | (lmtp && ob->lmtp_ignore_quota ? PEER_OFFERED_IGNQ : 0)
1923 | PEER_OFFERED_CHUNKING
1924 | PEER_OFFERED_PRDR
1925 #ifdef SUPPORT_I18N
1926 | (addrlist->prop.utf8_msg ? PEER_OFFERED_UTF8 : 0)
1927 /*XXX if we hand peercaps on to continued-conn processes,
1928 must not depend on this addr */
1929 #endif
1930 | PEER_OFFERED_DSN
1931 | PEER_OFFERED_PIPE
1932 | (ob->size_addition >= 0 ? PEER_OFFERED_SIZE : 0)
1933 );
1934
1935 /* Set for IGNOREQUOTA if the response to LHLO specifies support and the
1936 lmtp_ignore_quota option was set. */
1937
1938 igquotstr = peer_offered & PEER_OFFERED_IGNQ ? US" IGNOREQUOTA" : US"";
1939
1940 /* If the response to EHLO specified support for the SIZE parameter, note
1941 this, provided size_addition is non-negative. */
1942
1943 smtp_use_size = !!(peer_offered & PEER_OFFERED_SIZE);
1944
1945 /* Note whether the server supports PIPELINING. If hosts_avoid_esmtp matched
1946 the current host, esmtp will be false, so PIPELINING can never be used. If
1947 the current host matches hosts_avoid_pipelining, don't do it. */
1948
1949 smtp_use_pipelining = peer_offered & PEER_OFFERED_PIPE
1950 && verify_check_given_host(&ob->hosts_avoid_pipelining, host) != OK;
1951
1952 DEBUG(D_transport) debug_printf("%susing PIPELINING\n",
1953 smtp_use_pipelining ? "" : "not ");
1954
1955 if ( peer_offered & PEER_OFFERED_CHUNKING
1956 && verify_check_given_host(&ob->hosts_try_chunking, host) != OK)
1957 peer_offered &= ~PEER_OFFERED_CHUNKING;
1958
1959 if (peer_offered & PEER_OFFERED_CHUNKING)
1960 {DEBUG(D_transport) debug_printf("CHUNKING usable\n");}
1961
1962 #ifndef DISABLE_PRDR
1963 if ( peer_offered & PEER_OFFERED_PRDR
1964 && verify_check_given_host(&ob->hosts_try_prdr, host) != OK)
1965 peer_offered &= ~PEER_OFFERED_PRDR;
1966
1967 if (peer_offered & PEER_OFFERED_PRDR)
1968 {DEBUG(D_transport) debug_printf("PRDR usable\n");}
1969 #endif
1970
1971 /* Note if the server supports DSN */
1972 smtp_use_dsn = !!(peer_offered & PEER_OFFERED_DSN);
1973 DEBUG(D_transport) debug_printf("%susing DSN\n", smtp_use_dsn ? "" : "not ");
1974
1975 /* Note if the response to EHLO specifies support for the AUTH extension.
1976 If it has, check that this host is one we want to authenticate to, and do
1977 the business. The host name and address must be available when the
1978 authenticator's client driver is running. */
1979
1980 switch (yield = smtp_auth(buffer, sizeof(buffer), addrlist, host,
1981 ob, esmtp, &inblock, &outblock))
1982 {
1983 default: goto SEND_QUIT;
1984 case OK: break;
1985 case FAIL_SEND: goto SEND_FAILED;
1986 case FAIL: goto RESPONSE_FAILED;
1987 }
1988 }
1989
1990 /* The setting up of the SMTP call is now complete. Any subsequent errors are
1991 message-specific. */
1992
1993 setting_up = FALSE;
1994
1995 #ifdef SUPPORT_I18N
1996 if (addrlist->prop.utf8_msg)
1997 {
1998 utf8_needed = !addrlist->prop.utf8_downcvt
1999 && !addrlist->prop.utf8_downcvt_maybe;
2000 DEBUG(D_transport) if (!utf8_needed) debug_printf("utf8: %s downconvert\n",
2001 addrlist->prop.utf8_downcvt ? "mandatory" : "optional");
2002 }
2003
2004 /* If this is an international message we need the host to speak SMTPUTF8 */
2005 if (utf8_needed && !(peer_offered & PEER_OFFERED_UTF8))
2006 {
2007 errno = ERRNO_UTF8_FWD;
2008 goto RESPONSE_FAILED;
2009 }
2010 #endif
2011
2012 /* If there is a filter command specified for this transport, we can now
2013 set it up. This cannot be done until the identify of the host is known. */
2014
2015 if (tblock->filter_command != NULL)
2016 {
2017 BOOL rc;
2018 uschar buffer[64];
2019 sprintf(CS buffer, "%.50s transport", tblock->name);
2020 rc = transport_set_up_command(&transport_filter_argv, tblock->filter_command,
2021 TRUE, DEFER, addrlist, buffer, NULL);
2022 transport_filter_timeout = tblock->filter_timeout;
2023
2024 /* On failure, copy the error to all addresses, abandon the SMTP call, and
2025 yield ERROR. */
2026
2027 if (!rc)
2028 {
2029 set_errno_nohost(addrlist->next, addrlist->basic_errno, addrlist->message, DEFER,
2030 FALSE);
2031 yield = ERROR;
2032 goto SEND_QUIT;
2033 }
2034 }
2035
2036
2037 /* For messages that have more than the maximum number of envelope recipients,
2038 we want to send several transactions down the same SMTP connection. (See
2039 comments in deliver.c as to how this reconciles, heuristically, with
2040 remote_max_parallel.) This optimization was added to Exim after the following
2041 code was already working. The simplest way to put it in without disturbing the
2042 code was to use a goto to jump back to this point when there is another
2043 transaction to handle. */
2044
2045 SEND_MESSAGE:
2046 sync_addr = first_addr;
2047 address_count = 0;
2048 ok = FALSE;
2049 send_rset = TRUE;
2050 completed_address = FALSE;
2051
2052
2053 /* Initiate a message transfer. If we know the receiving MTA supports the SIZE
2054 qualification, send it, adding something to the message size to allow for
2055 imprecision and things that get added en route. Exim keeps the number of lines
2056 in a message, so we can give an accurate value for the original message, but we
2057 need some additional to handle added headers. (Double "." characters don't get
2058 included in the count.) */
2059
2060 p = buffer;
2061 *p = 0;
2062
2063 if (smtp_use_size)
2064 {
2065 sprintf(CS p, " SIZE=%d", message_size+message_linecount+ob->size_addition);
2066 while (*p) p++;
2067 }
2068
2069 #ifndef DISABLE_PRDR
2070 prdr_active = FALSE;
2071 if (peer_offered & PEER_OFFERED_PRDR)
2072 for (addr = first_addr; addr; addr = addr->next)
2073 if (addr->transport_return == PENDING_DEFER)
2074 {
2075 for (addr = addr->next; addr; addr = addr->next)
2076 if (addr->transport_return == PENDING_DEFER)
2077 { /* at least two recipients to send */
2078 prdr_active = TRUE;
2079 sprintf(CS p, " PRDR"); p += 5;
2080 break;
2081 }
2082 break;
2083 }
2084 #endif
2085
2086 #ifdef SUPPORT_I18N
2087 if ( addrlist->prop.utf8_msg
2088 && !addrlist->prop.utf8_downcvt
2089 && peer_offered & PEER_OFFERED_UTF8
2090 )
2091 sprintf(CS p, " SMTPUTF8"), p += 9;
2092 #endif
2093
2094 /* check if all addresses have lasthop flag */
2095 /* do not send RET and ENVID if true */
2096 for (dsn_all_lasthop = TRUE, addr = first_addr;
2097 address_count < max_rcpt && addr != NULL;
2098 addr = addr->next)
2099 if ((addr->dsn_flags & rf_dsnlasthop) != 1)
2100 {
2101 dsn_all_lasthop = FALSE;
2102 break;
2103 }
2104
2105 /* Add any DSN flags to the mail command */
2106
2107 if (smtp_use_dsn && !dsn_all_lasthop)
2108 {
2109 if (dsn_ret == dsn_ret_hdrs)
2110 {
2111 Ustrcpy(p, " RET=HDRS"); p += 9;
2112 }
2113 else if (dsn_ret == dsn_ret_full)
2114 {
2115 Ustrcpy(p, " RET=FULL"); p += 9;
2116 }
2117 if (dsn_envid != NULL)
2118 {
2119 string_format(p, sizeof(buffer) - (p-buffer), " ENVID=%s", dsn_envid);
2120 while (*p) p++;
2121 }
2122 }
2123
2124 /* If an authenticated_sender override has been specified for this transport
2125 instance, expand it. If the expansion is forced to fail, and there was already
2126 an authenticated_sender for this message, the original value will be used.
2127 Other expansion failures are serious. An empty result is ignored, but there is
2128 otherwise no check - this feature is expected to be used with LMTP and other
2129 cases where non-standard addresses (e.g. without domains) might be required. */
2130
2131 if (smtp_mail_auth_str(p, sizeof(buffer) - (p-buffer), addrlist, ob))
2132 {
2133 yield = ERROR;
2134 goto SEND_QUIT;
2135 }
2136
2137 /* From here until we send the DATA command, we can make use of PIPELINING
2138 if the server host supports it. The code has to be able to check the responses
2139 at any point, for when the buffer fills up, so we write it totally generally.
2140 When PIPELINING is off, each command written reports that it has flushed the
2141 buffer. */
2142
2143 pending_MAIL = TRUE; /* The block starts with MAIL */
2144
2145 {
2146 uschar * s = return_path;
2147 #ifdef SUPPORT_I18N
2148 uschar * errstr = NULL;
2149
2150 /* If we must downconvert, do the from-address here. Remember we had to
2151 for the to-addresses (done below), and also (ugly) for re-doing when building
2152 the delivery log line. */
2153
2154 if ( addrlist->prop.utf8_msg
2155 && (addrlist->prop.utf8_downcvt || !(peer_offered & PEER_OFFERED_UTF8))
2156 )
2157 {
2158 if (s = string_address_utf8_to_alabel(return_path, &errstr), errstr)
2159 {
2160 set_errno_nohost(addrlist, ERRNO_EXPANDFAIL, errstr, DEFER, FALSE);
2161 yield = ERROR;
2162 goto SEND_QUIT;
2163 }
2164 setflag(addrlist, af_utf8_downcvt);
2165 }
2166 #endif
2167
2168 rc = smtp_write_command(&outblock, smtp_use_pipelining,
2169 "MAIL FROM:<%s>%s\r\n", s, buffer);
2170 }
2171
2172 mail_command = string_copy(big_buffer); /* Save for later error message */
2173
2174 switch(rc)
2175 {
2176 case -1: /* Transmission error */
2177 goto SEND_FAILED;
2178
2179 case +1: /* Block was sent */
2180 if (!smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
2181 ob->command_timeout))
2182 {
2183 if (errno == 0 && buffer[0] == '4')
2184 {
2185 errno = ERRNO_MAIL4XX;
2186 addrlist->more_errno |= ((buffer[1] - '0')*10 + buffer[2] - '0') << 8;
2187 }
2188 goto RESPONSE_FAILED;
2189 }
2190 pending_MAIL = FALSE;
2191 break;
2192 }
2193
2194 /* Pass over all the relevant recipient addresses for this host, which are the
2195 ones that have status PENDING_DEFER. If we are using PIPELINING, we can send
2196 several before we have to read the responses for those seen so far. This
2197 checking is done by a subroutine because it also needs to be done at the end.
2198 Send only up to max_rcpt addresses at a time, leaving first_addr pointing to
2199 the next one if not all are sent.
2200
2201 In the MUA wrapper situation, we want to flush the PIPELINING buffer for the
2202 last address because we want to abort if any recipients have any kind of
2203 problem, temporary or permanent. We know that all recipient addresses will have
2204 the PENDING_DEFER status, because only one attempt is ever made, and we know
2205 that max_rcpt will be large, so all addresses will be done at once. */
2206
2207 for (addr = first_addr;
2208 addr && address_count < max_rcpt;
2209 addr = addr->next)
2210 {
2211 int count;
2212 BOOL no_flush;
2213 uschar * rcpt_addr;
2214
2215 addr->dsn_aware = smtp_use_dsn ? dsn_support_yes : dsn_support_no;
2216
2217 if (addr->transport_return != PENDING_DEFER) continue;
2218
2219 address_count++;
2220 no_flush = smtp_use_pipelining && (!mua_wrapper || addr->next);
2221
2222 /* Add any DSN flags to the rcpt command and add to the sent string */
2223
2224 p = buffer;
2225 *p = 0;
2226
2227 if (smtp_use_dsn && !(addr->dsn_flags & rf_dsnlasthop))
2228 {
2229 if ((addr->dsn_flags & rf_dsnflags) != 0)
2230 {
2231 int i;
2232 BOOL first = TRUE;
2233 Ustrcpy(p, " NOTIFY=");
2234 while (*p) p++;
2235 for (i = 0; i < 4; i++)
2236 if ((addr->dsn_flags & rf_list[i]) != 0)
2237 {
2238 if (!first) *p++ = ',';
2239 first = FALSE;
2240 Ustrcpy(p, rf_names[i]);
2241 while (*p) p++;
2242 }
2243 }
2244
2245 if (addr->dsn_orcpt)
2246 {
2247 string_format(p, sizeof(buffer) - (p-buffer), " ORCPT=%s",
2248 addr->dsn_orcpt);
2249 while (*p) p++;
2250 }
2251 }
2252
2253 /* Now send the RCPT command, and process outstanding responses when
2254 necessary. After a timeout on RCPT, we just end the function, leaving the
2255 yield as OK, because this error can often mean that there is a problem with
2256 just one address, so we don't want to delay the host. */
2257
2258 rcpt_addr = transport_rcpt_address(addr, tblock->rcpt_include_affixes);
2259
2260 #ifdef SUPPORT_I18N
2261 {
2262 uschar * dummy_errstr;
2263 if ( testflag(addrlist, af_utf8_downcvt)
2264 && (rcpt_addr = string_address_utf8_to_alabel(rcpt_addr, &dummy_errstr),
2265 dummy_errstr
2266 ) )
2267 {
2268 errno = ERRNO_EXPANDFAIL;
2269 goto SEND_FAILED;
2270 }
2271 }
2272 #endif
2273
2274 count = smtp_write_command(&outblock, no_flush, "RCPT TO:<%s>%s%s\r\n",
2275 rcpt_addr, igquotstr, buffer);
2276
2277 if (count < 0) goto SEND_FAILED;
2278 if (count > 0)
2279 {
2280 switch(sync_responses(first_addr, tblock->rcpt_include_affixes,
2281 &sync_addr, host, count, ob->address_retry_include_sender,
2282 pending_MAIL, 0, &inblock, ob->command_timeout, buffer,
2283 sizeof(buffer)))
2284 {
2285 case 3: ok = TRUE; /* 2xx & 5xx => OK & progress made */
2286 case 2: completed_address = TRUE; /* 5xx (only) => progress made */
2287 break;
2288
2289 case 1: ok = TRUE; /* 2xx (only) => OK, but if LMTP, */
2290 if (!lmtp) completed_address = TRUE; /* can't tell about progress yet */
2291 case 0: /* No 2xx or 5xx, but no probs */
2292 break;
2293
2294 case -1: goto END_OFF; /* Timeout on RCPT */
2295 default: goto RESPONSE_FAILED; /* I/O error, or any MAIL error */
2296 }
2297 pending_MAIL = FALSE; /* Dealt with MAIL */
2298 }
2299 } /* Loop for next address */
2300
2301 /* If we are an MUA wrapper, abort if any RCPTs were rejected, either
2302 permanently or temporarily. We should have flushed and synced after the last
2303 RCPT. */
2304
2305 if (mua_wrapper)
2306 {
2307 address_item *badaddr;
2308 for (badaddr = first_addr; badaddr; badaddr = badaddr->next)
2309 if (badaddr->transport_return != PENDING_OK)
2310 {
2311 /*XXX could we find a better errno than 0 here? */
2312 set_errno_nohost(addrlist, 0, badaddr->message, FAIL,
2313 testflag(badaddr, af_pass_message));
2314 ok = FALSE;
2315 break;
2316 }
2317 }
2318
2319 /* If ok is TRUE, we know we have got at least one good recipient, and must now
2320 send DATA, but if it is FALSE (in the normal, non-wrapper case), we may still
2321 have a good recipient buffered up if we are pipelining. We don't want to waste
2322 time sending DATA needlessly, so we only send it if either ok is TRUE or if we
2323 are pipelining. The responses are all handled by sync_responses(). */
2324
2325 if (ok || (smtp_use_pipelining && !mua_wrapper))
2326 {
2327 int count = smtp_write_command(&outblock, FALSE, "DATA\r\n");
2328 if (count < 0) goto SEND_FAILED;
2329 switch(sync_responses(first_addr, tblock->rcpt_include_affixes, &sync_addr,
2330 host, count, ob->address_retry_include_sender, pending_MAIL,
2331 ok? +1 : -1, &inblock, ob->command_timeout, buffer, sizeof(buffer)))
2332 {
2333 case 3: ok = TRUE; /* 2xx & 5xx => OK & progress made */
2334 case 2: completed_address = TRUE; /* 5xx (only) => progress made */
2335 break;
2336
2337 case 1: ok = TRUE; /* 2xx (only) => OK, but if LMTP, */
2338 if (!lmtp) completed_address = TRUE; /* can't tell about progress yet */
2339 case 0: break; /* No 2xx or 5xx, but no probs */
2340
2341 case -1: goto END_OFF; /* Timeout on RCPT */
2342 default: goto RESPONSE_FAILED; /* I/O error, or any MAIL/DATA error */
2343 }
2344 }
2345
2346 /* Save the first address of the next batch. */
2347
2348 first_addr = addr;
2349
2350 /* If there were no good recipients (but otherwise there have been no
2351 problems), just set ok TRUE, since we have handled address-specific errors
2352 already. Otherwise, it's OK to send the message. Use the check/escape mechanism
2353 for handling the SMTP dot-handling protocol, flagging to apply to headers as
2354 well as body. Set the appropriate timeout value to be used for each chunk.
2355 (Haven't been able to make it work using select() for writing yet.) */
2356
2357 if (!ok)
2358 ok = TRUE;
2359 else
2360 {
2361 transport_ctx tctx = {
2362 tblock,
2363 addrlist,
2364 US".", US"..", /* Escaping strings */
2365 topt_use_crlf | topt_escape_headers
2366 | (tblock->body_only ? topt_no_headers : 0)
2367 | (tblock->headers_only ? topt_no_body : 0)
2368 | (tblock->return_path_add ? topt_add_return_path : 0)
2369 | (tblock->delivery_date_add ? topt_add_delivery_date : 0)
2370 | (tblock->envelope_to_add ? topt_add_envelope_to : 0)
2371 };
2372
2373 if (peer_offered & PEER_OFFERED_CHUNKING)
2374 {
2375 tctx.options |= topt_use_bdat;
2376 tctx.check_string = tctx.escape_string = NULL;
2377 }
2378 else
2379 tctx.options |= topt_end_dot;
2380
2381 sigalrm_seen = FALSE;
2382 transport_write_timeout = ob->data_timeout;
2383 smtp_command = US"sending data block"; /* For error messages */
2384 DEBUG(D_transport|D_v)
2385 debug_printf(" SMTP>> writing message %s\n",
2386 peer_offered & PEER_OFFERED_CHUNKING
2387 ? "using CHUNKING" : "and terminating \".\"");
2388 transport_count = 0;
2389
2390 #ifndef DISABLE_DKIM
2391 ok = dkim_transport_write_message(inblock.sock, &tctx, &ob->dkim);
2392 #else
2393 ok = transport_write_message(inblock.sock, &tctx, 0);
2394 #endif
2395
2396 /* transport_write_message() uses write() because it is called from other
2397 places to write to non-sockets. This means that under some OS (e.g. Solaris)
2398 it can exit with "Broken pipe" as its error. This really means that the
2399 socket got closed at the far end. */
2400
2401 transport_write_timeout = 0; /* for subsequent transports */
2402
2403 /* Failure can either be some kind of I/O disaster (including timeout),
2404 or the failure of a transport filter or the expansion of added headers. */
2405
2406 if (!ok)
2407 {
2408 buffer[0] = 0; /* There hasn't been a response */
2409 goto RESPONSE_FAILED;
2410 }
2411
2412 /* We used to send the terminating "." explicitly here, but because of
2413 buffering effects at both ends of TCP/IP connections, you don't gain
2414 anything by keeping it separate, so it might as well go in the final
2415 data buffer for efficiency. This is now done by setting the topt_end_dot
2416 flag above. */
2417
2418 smtp_command = US"end of data";
2419
2420 #ifndef DISABLE_PRDR
2421 /* For PRDR we optionally get a partial-responses warning
2422 * followed by the individual responses, before going on with
2423 * the overall response. If we don't get the warning then deal
2424 * with per non-PRDR. */
2425 if(prdr_active)
2426 {
2427 ok = smtp_read_response(&inblock, buffer, sizeof(buffer), '3',
2428 ob->final_timeout);
2429 if (!ok && errno == 0)
2430 switch(buffer[0])
2431 {
2432 case '2': prdr_active = FALSE;
2433 ok = TRUE;
2434 break;
2435 case '4': errno = ERRNO_DATA4XX;
2436 addrlist->more_errno |= ((buffer[1] - '0')*10 + buffer[2] - '0') << 8;
2437 break;
2438 }
2439 }
2440 else
2441 #endif
2442
2443 /* For non-PRDR SMTP, we now read a single response that applies to the
2444 whole message. If it is OK, then all the addresses have been delivered. */
2445
2446 if (!lmtp)
2447 {
2448 ok = smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
2449 ob->final_timeout);
2450 if (!ok && errno == 0 && buffer[0] == '4')
2451 {
2452 errno = ERRNO_DATA4XX;
2453 addrlist->more_errno |= ((buffer[1] - '0')*10 + buffer[2] - '0') << 8;
2454 }
2455 }
2456
2457 /* For LMTP, we get back a response for every RCPT command that we sent;
2458 some may be accepted and some rejected. For those that get a response, their
2459 status is fixed; any that are accepted have been handed over, even if later
2460 responses crash - at least, that's how I read RFC 2033.
2461
2462 If all went well, mark the recipient addresses as completed, record which
2463 host/IPaddress they were delivered to, and cut out RSET when sending another
2464 message down the same channel. Write the completed addresses to the journal
2465 now so that they are recorded in case there is a crash of hardware or
2466 software before the spool gets updated. Also record the final SMTP
2467 confirmation if needed (for SMTP only). */
2468
2469 if (ok)
2470 {
2471 int flag = '=';
2472 int delivery_time = (int)(time(NULL) - start_delivery_time);
2473 int len;
2474 uschar *conf = NULL;
2475 send_rset = FALSE;
2476
2477 /* Set up confirmation if needed - applies only to SMTP */
2478
2479 if (
2480 #ifdef DISABLE_EVENT
2481 LOGGING(smtp_confirmation) &&
2482 #endif
2483 !lmtp
2484 )
2485 {
2486 const uschar *s = string_printing(buffer);
2487 /* deconst cast ok here as string_printing was checked to have alloc'n'copied */
2488 conf = (s == buffer)? (uschar *)string_copy(s) : US s;
2489 }
2490
2491 /* Process all transported addresses - for LMTP or PRDR, read a status for
2492 each one. */
2493
2494 for (addr = addrlist; addr != first_addr; addr = addr->next)
2495 {
2496 if (addr->transport_return != PENDING_OK) continue;
2497
2498 /* LMTP - if the response fails badly (e.g. timeout), use it for all the
2499 remaining addresses. Otherwise, it's a return code for just the one
2500 address. For temporary errors, add a retry item for the address so that
2501 it doesn't get tried again too soon. */
2502
2503 #ifndef DISABLE_PRDR
2504 if (lmtp || prdr_active)
2505 #else
2506 if (lmtp)
2507 #endif
2508 {
2509 if (!smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
2510 ob->final_timeout))
2511 {
2512 if (errno != 0 || buffer[0] == 0) goto RESPONSE_FAILED;
2513 addr->message = string_sprintf(
2514 #ifndef DISABLE_PRDR
2515 "%s error after %s: %s", prdr_active ? "PRDR":"LMTP",
2516 #else
2517 "LMTP error after %s: %s",
2518 #endif
2519 big_buffer, string_printing(buffer));
2520 setflag(addr, af_pass_message); /* Allow message to go to user */
2521 if (buffer[0] == '5')
2522 addr->transport_return = FAIL;
2523 else
2524 {
2525 errno = ERRNO_DATA4XX;
2526 addr->more_errno |= ((buffer[1] - '0')*10 + buffer[2] - '0') << 8;
2527 addr->transport_return = DEFER;
2528 #ifndef DISABLE_PRDR
2529 if (!prdr_active)
2530 #endif
2531 retry_add_item(addr, addr->address_retry_key, 0);
2532 }
2533 continue;
2534 }
2535 completed_address = TRUE; /* NOW we can set this flag */
2536 if (LOGGING(smtp_confirmation))
2537 {
2538 const uschar *s = string_printing(buffer);
2539 /* deconst cast ok here as string_printing was checked to have alloc'n'copied */
2540 conf = (s == buffer)? (uschar *)string_copy(s) : US s;
2541 }
2542 }
2543
2544 /* SMTP, or success return from LMTP for this address. Pass back the
2545 actual host that was used. */
2546
2547 addr->transport_return = OK;
2548 addr->more_errno = delivery_time;
2549 addr->host_used = host;
2550 addr->special_action = flag;
2551 addr->message = conf;
2552 #ifndef DISABLE_PRDR
2553 if (prdr_active) addr->flags |= af_prdr_used;
2554 #endif
2555 flag = '-';
2556
2557 #ifndef DISABLE_PRDR
2558 if (!prdr_active)
2559 #endif
2560 {
2561 /* Update the journal. For homonymic addresses, use the base address plus
2562 the transport name. See lots of comments in deliver.c about the reasons
2563 for the complications when homonyms are involved. Just carry on after
2564 write error, as it may prove possible to update the spool file later. */
2565
2566 if (testflag(addr, af_homonym))
2567 sprintf(CS buffer, "%.500s/%s\n", addr->unique + 3, tblock->name);
2568 else
2569 sprintf(CS buffer, "%.500s\n", addr->unique);
2570
2571 DEBUG(D_deliver) debug_printf("journalling %s\n", buffer);
2572 len = Ustrlen(CS buffer);
2573 if (write(journal_fd, buffer, len) != len)
2574 log_write(0, LOG_MAIN|LOG_PANIC, "failed to write journal for "
2575 "%s: %s", buffer, strerror(errno));
2576 }
2577 }
2578
2579 #ifndef DISABLE_PRDR
2580 if (prdr_active)
2581 {
2582 /* PRDR - get the final, overall response. For any non-success
2583 upgrade all the address statuses. */
2584 ok = smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
2585 ob->final_timeout);
2586 if (!ok)
2587 {
2588 if(errno == 0 && buffer[0] == '4')
2589 {
2590 errno = ERRNO_DATA4XX;
2591 addrlist->more_errno |= ((buffer[1] - '0')*10 + buffer[2] - '0') << 8;
2592 }
2593 for (addr = addrlist; addr != first_addr; addr = addr->next)
2594 if (buffer[0] == '5' || addr->transport_return == OK)
2595 addr->transport_return = PENDING_OK; /* allow set_errno action */
2596 goto RESPONSE_FAILED;
2597 }
2598
2599 /* Update the journal, or setup retry. */
2600 for (addr = addrlist; addr != first_addr; addr = addr->next)
2601 if (addr->transport_return == OK)
2602 {
2603 if (testflag(addr, af_homonym))
2604 sprintf(CS buffer, "%.500s/%s\n", addr->unique + 3, tblock->name);
2605 else
2606 sprintf(CS buffer, "%.500s\n", addr->unique);
2607
2608 DEBUG(D_deliver) debug_printf("journalling(PRDR) %s\n", buffer);
2609 len = Ustrlen(CS buffer);
2610 if (write(journal_fd, buffer, len) != len)
2611 log_write(0, LOG_MAIN|LOG_PANIC, "failed to write journal for "
2612 "%s: %s", buffer, strerror(errno));
2613 }
2614 else if (addr->transport_return == DEFER)
2615 retry_add_item(addr, addr->address_retry_key, -2);
2616 }
2617 #endif
2618
2619 /* Ensure the journal file is pushed out to disk. */
2620
2621 if (EXIMfsync(journal_fd) < 0)
2622 log_write(0, LOG_MAIN|LOG_PANIC, "failed to fsync journal: %s",
2623 strerror(errno));
2624 }
2625 }
2626
2627
2628 /* Handle general (not specific to one address) failures here. The value of ok
2629 is used to skip over this code on the falling through case. A timeout causes a
2630 deferral. Other errors may defer or fail according to the response code, and
2631 may set up a special errno value, e.g. after connection chopped, which is
2632 assumed if errno == 0 and there is no text in the buffer. If control reaches
2633 here during the setting up phase (i.e. before MAIL FROM) then always defer, as
2634 the problem is not related to this specific message. */
2635
2636 if (!ok)
2637 {
2638 int code, set_rc;
2639 uschar * set_message;
2640
2641 RESPONSE_FAILED:
2642 {
2643 save_errno = errno;
2644 message = NULL;
2645 send_quit = check_response(host, &save_errno, addrlist->more_errno,
2646 buffer, &code, &message, &pass_message);
2647 goto FAILED;
2648 }
2649
2650 SEND_FAILED:
2651 {
2652 save_errno = errno;
2653 code = '4';
2654 message = US string_sprintf("send() to %s [%s] failed: %s",
2655 host->name, host->address, strerror(save_errno));
2656 send_quit = FALSE;
2657 goto FAILED;
2658 }
2659
2660 /* This label is jumped to directly when a TLS negotiation has failed,
2661 or was not done for a host for which it is required. Values will be set
2662 in message and save_errno, and setting_up will always be true. Treat as
2663 a temporary error. */
2664
2665 #ifdef SUPPORT_TLS
2666 TLS_FAILED:
2667 code = '4';
2668 #endif
2669
2670 /* If the failure happened while setting up the call, see if the failure was
2671 a 5xx response (this will either be on connection, or following HELO - a 5xx
2672 after EHLO causes it to try HELO). If so, fail all addresses, as this host is
2673 never going to accept them. For other errors during setting up (timeouts or
2674 whatever), defer all addresses, and yield DEFER, so that the host is not
2675 tried again for a while. */
2676
2677 FAILED:
2678 ok = FALSE; /* For when reached by GOTO */
2679 set_message = message;
2680
2681 if (setting_up)
2682 {
2683 if (code == '5')
2684 set_rc = FAIL;
2685 else
2686 yield = set_rc = DEFER;
2687 }
2688
2689 /* We want to handle timeouts after MAIL or "." and loss of connection after
2690 "." specially. They can indicate a problem with the sender address or with
2691 the contents of the message rather than a real error on the connection. These
2692 cases are treated in the same way as a 4xx response. This next bit of code
2693 does the classification. */
2694
2695 else
2696 {
2697 BOOL message_error;
2698
2699 switch(save_errno)
2700 {
2701 #ifdef SUPPORT_I18N
2702 case ERRNO_UTF8_FWD:
2703 code = '5';
2704 /*FALLTHROUGH*/
2705 #endif
2706 case 0:
2707 case ERRNO_MAIL4XX:
2708 case ERRNO_DATA4XX:
2709 message_error = TRUE;
2710 break;
2711
2712 case ETIMEDOUT:
2713 message_error = Ustrncmp(smtp_command,"MAIL",4) == 0 ||
2714 Ustrncmp(smtp_command,"end ",4) == 0;
2715 break;
2716
2717 case ERRNO_SMTPCLOSED:
2718 message_error = Ustrncmp(smtp_command,"end ",4) == 0;
2719 break;
2720
2721 default:
2722 message_error = FALSE;
2723 break;
2724 }
2725
2726 /* Handle the cases that are treated as message errors. These are:
2727
2728 (a) negative response or timeout after MAIL
2729 (b) negative response after DATA
2730 (c) negative response or timeout or dropped connection after "."
2731 (d) utf8 support required and not offered
2732
2733 It won't be a negative response or timeout after RCPT, as that is dealt
2734 with separately above. The action in all cases is to set an appropriate
2735 error code for all the addresses, but to leave yield set to OK because the
2736 host itself has not failed. Of course, it might in practice have failed
2737 when we've had a timeout, but if so, we'll discover that at the next
2738 delivery attempt. For a temporary error, set the message_defer flag, and
2739 write to the logs for information if this is not the last host. The error
2740 for the last host will be logged as part of the address's log line. */
2741
2742 if (message_error)
2743 {
2744 if (mua_wrapper) code = '5'; /* Force hard failure in wrapper mode */
2745
2746 /* If there's an errno, the message contains just the identity of
2747 the host. */
2748
2749 if (code == '5')
2750 set_rc = FAIL;
2751 else /* Anything other than 5 is treated as temporary */
2752 {
2753 set_rc = DEFER;
2754 if (save_errno > 0)
2755 message = US string_sprintf("%s: %s", message, strerror(save_errno));
2756 if (host->next != NULL) log_write(0, LOG_MAIN, "%s", message);
2757 msglog_line(host, message);
2758 *message_defer = TRUE;
2759 }
2760 }
2761
2762 /* Otherwise, we have an I/O error or a timeout other than after MAIL or
2763 ".", or some other transportation error. We defer all addresses and yield
2764 DEFER, except for the case of failed add_headers expansion, or a transport
2765 filter failure, when the yield should be ERROR, to stop it trying other
2766 hosts. */
2767
2768 else
2769 {
2770 set_rc = DEFER;
2771 yield = (save_errno == ERRNO_CHHEADER_FAIL ||
2772 save_errno == ERRNO_FILTER_FAIL)? ERROR : DEFER;
2773 }
2774 }
2775
2776 set_errno(addrlist, save_errno, set_message, set_rc, pass_message, host
2777 #ifdef EXPERIMENTAL_DSN_INFO
2778 , smtp_greeting, helo_response
2779 #endif
2780 );
2781 }
2782
2783
2784 /* If all has gone well, send_quit will be set TRUE, implying we can end the
2785 SMTP session tidily. However, if there were too many addresses to send in one
2786 message (indicated by first_addr being non-NULL) we want to carry on with the
2787 rest of them. Also, it is desirable to send more than one message down the SMTP
2788 connection if there are several waiting, provided we haven't already sent so
2789 many as to hit the configured limit. The function transport_check_waiting looks
2790 for a waiting message and returns its id. Then transport_pass_socket tries to
2791 set up a continued delivery by passing the socket on to another process. The
2792 variable send_rset is FALSE if a message has just been successfully transfered.
2793
2794 If we are already sending down a continued channel, there may be further
2795 addresses not yet delivered that are aimed at the same host, but which have not
2796 been passed in this run of the transport. In this case, continue_more will be
2797 true, and all we should do is send RSET if necessary, and return, leaving the
2798 channel open.
2799
2800 However, if no address was disposed of, i.e. all addresses got 4xx errors, we
2801 do not want to continue with other messages down the same channel, because that
2802 can lead to looping between two or more messages, all with the same,
2803 temporarily failing address(es). [The retry information isn't updated yet, so
2804 new processes keep on trying.] We probably also don't want to try more of this
2805 message's addresses either.
2806
2807 If we have started a TLS session, we have to end it before passing the
2808 connection to a new process. However, not all servers can handle this (Exim
2809 can), so we do not pass such a connection on if the host matches
2810 hosts_nopass_tls. */
2811
2812 DEBUG(D_transport)
2813 debug_printf("ok=%d send_quit=%d send_rset=%d continue_more=%d "
2814 "yield=%d first_address is %sNULL\n", ok, send_quit, send_rset,
2815 continue_more, yield, (first_addr == NULL)? "":"not ");
2816
2817 if (completed_address && ok && send_quit)
2818 {
2819 BOOL more;
2820 smtp_compare_t t_compare;
2821
2822 t_compare.tblock = tblock;
2823 t_compare.current_sender_address = sender_address;
2824
2825 if ( first_addr != NULL
2826 || continue_more
2827 || ( ( tls_out.active < 0
2828 || verify_check_given_host(&ob->hosts_nopass_tls, host) != OK
2829 )
2830 &&
2831 transport_check_waiting(tblock->name, host->name,
2832 tblock->connection_max_messages, new_message_id, &more,
2833 (oicf)smtp_are_same_identities, (void*)&t_compare)
2834 ) )
2835 {
2836 uschar *msg;
2837 BOOL pass_message;
2838
2839 if (send_rset)
2840 {
2841 if (! (ok = smtp_write_command(&outblock, FALSE, "RSET\r\n") >= 0))
2842 {
2843 msg = US string_sprintf("send() to %s [%s] failed: %s", host->name,
2844 host->address, strerror(save_errno));
2845 send_quit = FALSE;
2846 }
2847 else if (! (ok = smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
2848 ob->command_timeout)))
2849 {
2850 int code;
2851 send_quit = check_response(host, &errno, 0, buffer, &code, &msg,
2852 &pass_message);
2853 if (!send_quit)
2854 {
2855 DEBUG(D_transport) debug_printf("H=%s [%s] %s\n",
2856 host->name, host->address, msg);
2857 }
2858 }
2859 }
2860
2861 /* Either RSET was not needed, or it succeeded */
2862
2863 if (ok)
2864 {
2865 if (first_addr != NULL) /* More addresses still to be sent */
2866 { /* in this run of the transport */
2867 continue_sequence++; /* Causes * in logging */
2868 goto SEND_MESSAGE;
2869 }
2870 if (continue_more) return yield; /* More addresses for another run */
2871
2872 /* Pass the socket to a new Exim process. Before doing so, we must shut
2873 down TLS. Not all MTAs allow for the continuation of the SMTP session
2874 when TLS is shut down. We test for this by sending a new EHLO. If we
2875 don't get a good response, we don't attempt to pass the socket on. */
2876
2877 #ifdef SUPPORT_TLS
2878 if (tls_out.active >= 0)
2879 {
2880 tls_close(FALSE, TRUE);
2881 if (smtps)
2882 ok = FALSE;
2883 else
2884 ok = smtp_write_command(&outblock,FALSE,"EHLO %s\r\n",helo_data) >= 0 &&
2885 smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
2886 ob->command_timeout);
2887 }
2888 #endif
2889
2890 /* If the socket is successfully passed, we musn't send QUIT (or
2891 indeed anything!) from here. */
2892
2893 /*XXX DSN_INFO: assume likely to do new HELO; but for greet we'll want to
2894 propagate it from the initial
2895 */
2896 if (ok && transport_pass_socket(tblock->name, host->name, host->address,
2897 new_message_id, inblock.sock))
2898 {
2899 send_quit = FALSE;
2900 }
2901 }
2902
2903 /* If RSET failed and there are addresses left, they get deferred. */
2904
2905 else set_errno(first_addr, errno, msg, DEFER, FALSE, host
2906 #ifdef EXPERIMENTAL_DSN_INFO
2907 , smtp_greeting, helo_response
2908 #endif
2909 );
2910 }
2911 }
2912
2913 /* End off tidily with QUIT unless the connection has died or the socket has
2914 been passed to another process. There has been discussion on the net about what
2915 to do after sending QUIT. The wording of the RFC suggests that it is necessary
2916 to wait for a response, but on the other hand, there isn't anything one can do
2917 with an error response, other than log it. Exim used to do that. However,
2918 further discussion suggested that it is positively advantageous not to wait for
2919 the response, but to close the session immediately. This is supposed to move
2920 the TCP/IP TIME_WAIT state from the server to the client, thereby removing some
2921 load from the server. (Hosts that are both servers and clients may not see much
2922 difference, of course.) Further discussion indicated that this was safe to do
2923 on Unix systems which have decent implementations of TCP/IP that leave the
2924 connection around for a while (TIME_WAIT) after the application has gone away.
2925 This enables the response sent by the server to be properly ACKed rather than
2926 timed out, as can happen on broken TCP/IP implementations on other OS.
2927
2928 This change is being made on 31-Jul-98. After over a year of trouble-free
2929 operation, the old commented-out code was removed on 17-Sep-99. */
2930
2931 SEND_QUIT:
2932 if (send_quit) (void)smtp_write_command(&outblock, FALSE, "QUIT\r\n");
2933
2934 END_OFF:
2935
2936 #ifdef SUPPORT_TLS
2937 tls_close(FALSE, TRUE);
2938 #endif
2939
2940 /* Close the socket, and return the appropriate value, first setting
2941 works because the NULL setting is passed back to the calling process, and
2942 remote_max_parallel is forced to 1 when delivering over an existing connection,
2943
2944 If all went well and continue_more is set, we shouldn't actually get here if
2945 there are further addresses, as the return above will be taken. However,
2946 writing RSET might have failed, or there may be other addresses whose hosts are
2947 specified in the transports, and therefore not visible at top level, in which
2948 case continue_more won't get set. */
2949
2950 HDEBUG(D_transport|D_acl|D_v) debug_printf(" SMTP(close)>>\n");
2951 (void)close(inblock.sock);
2952
2953 #ifndef DISABLE_EVENT
2954 (void) event_raise(tblock->event_action, US"tcp:close", NULL);
2955 #endif
2956
2957 continue_transport = NULL;
2958 continue_hostname = NULL;
2959 return yield;
2960 }
2961
2962
2963
2964
2965 /*************************************************
2966 * Closedown entry point *
2967 *************************************************/
2968
2969 /* This function is called when exim is passed an open smtp channel
2970 from another incarnation, but the message which it has been asked
2971 to deliver no longer exists. The channel is on stdin.
2972
2973 We might do fancy things like looking for another message to send down
2974 the channel, but if the one we sought has gone, it has probably been
2975 delivered by some other process that itself will seek further messages,
2976 so just close down our connection.
2977
2978 Argument: pointer to the transport instance block
2979 Returns: nothing
2980 */
2981
2982 void
2983 smtp_transport_closedown(transport_instance *tblock)
2984 {
2985 smtp_transport_options_block *ob =
2986 (smtp_transport_options_block *)(tblock->options_block);
2987 smtp_inblock inblock;
2988 smtp_outblock outblock;
2989 uschar buffer[256];
2990 uschar inbuffer[4096];
2991 uschar outbuffer[16];
2992
2993 inblock.sock = fileno(stdin);
2994 inblock.buffer = inbuffer;
2995 inblock.buffersize = sizeof(inbuffer);
2996 inblock.ptr = inbuffer;
2997 inblock.ptrend = inbuffer;
2998
2999 outblock.sock = inblock.sock;
3000 outblock.buffersize = sizeof(outbuffer);
3001 outblock.buffer = outbuffer;
3002 outblock.ptr = outbuffer;
3003 outblock.cmd_count = 0;
3004 outblock.authenticating = FALSE;
3005
3006 (void)smtp_write_command(&outblock, FALSE, "QUIT\r\n");
3007 (void)smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
3008 ob->command_timeout);
3009 (void)close(inblock.sock);
3010 }
3011
3012
3013
3014 /*************************************************
3015 * Prepare addresses for delivery *
3016 *************************************************/
3017
3018 /* This function is called to flush out error settings from previous delivery
3019 attempts to other hosts. It also records whether we got here via an MX record
3020 or not in the more_errno field of the address. We are interested only in
3021 addresses that are still marked DEFER - others may have got delivered to a
3022 previously considered IP address. Set their status to PENDING_DEFER to indicate
3023 which ones are relevant this time.
3024
3025 Arguments:
3026 addrlist the list of addresses
3027 host the host we are delivering to
3028
3029 Returns: the first address for this delivery
3030 */
3031
3032 static address_item *
3033 prepare_addresses(address_item *addrlist, host_item *host)
3034 {
3035 address_item *first_addr = NULL;
3036 address_item *addr;
3037 for (addr = addrlist; addr != NULL; addr = addr->next)
3038 if (addr->transport_return == DEFER)
3039 {
3040 if (first_addr == NULL) first_addr = addr;
3041 addr->transport_return = PENDING_DEFER;
3042 addr->basic_errno = 0;
3043 addr->more_errno = (host->mx >= 0)? 'M' : 'A';
3044 addr->message = NULL;
3045 #ifdef SUPPORT_TLS
3046 addr->cipher = NULL;
3047 addr->ourcert = NULL;
3048 addr->peercert = NULL;
3049 addr->peerdn = NULL;
3050 addr->ocsp = OCSP_NOT_REQ;
3051 #endif
3052 #ifdef EXPERIMENTAL_DSN_INFO
3053 addr->smtp_greeting = NULL;
3054 addr->helo_response = NULL;
3055 #endif
3056 }
3057 return first_addr;
3058 }
3059
3060
3061
3062 /*************************************************
3063 * Main entry point *
3064 *************************************************/
3065
3066 /* See local README for interface details. As this is a remote transport, it is
3067 given a chain of addresses to be delivered in one connection, if possible. It
3068 always returns TRUE, indicating that each address has its own independent
3069 status set, except if there is a setting up problem, in which case it returns
3070 FALSE. */
3071
3072 BOOL
3073 smtp_transport_entry(
3074 transport_instance *tblock, /* data for this instantiation */
3075 address_item *addrlist) /* addresses we are working on */
3076 {
3077 int cutoff_retry;
3078 int port;
3079 int hosts_defer = 0;
3080 int hosts_fail = 0;
3081 int hosts_looked_up = 0;
3082 int hosts_retry = 0;
3083 int hosts_serial = 0;
3084 int hosts_total = 0;
3085 int total_hosts_tried = 0;
3086 address_item *addr;
3087 BOOL expired = TRUE;
3088 BOOL continuing = continue_hostname != NULL;
3089 uschar *expanded_hosts = NULL;
3090 uschar *pistring;
3091 uschar *tid = string_sprintf("%s transport", tblock->name);
3092 smtp_transport_options_block *ob =
3093 (smtp_transport_options_block *)(tblock->options_block);
3094 host_item *hostlist = addrlist->host_list;
3095 host_item *host = NULL;
3096
3097 DEBUG(D_transport)
3098 {
3099 debug_printf("%s transport entered\n", tblock->name);
3100 for (addr = addrlist; addr != NULL; addr = addr->next)
3101 debug_printf(" %s\n", addr->address);
3102 if (continuing) debug_printf("already connected to %s [%s]\n",
3103 continue_hostname, continue_host_address);
3104 }
3105
3106 /* Set the flag requesting that these hosts be added to the waiting
3107 database if the delivery fails temporarily or if we are running with
3108 queue_smtp or a 2-stage queue run. This gets unset for certain
3109 kinds of error, typically those that are specific to the message. */
3110
3111 update_waiting = TRUE;
3112
3113 /* If a host list is not defined for the addresses - they must all have the
3114 same one in order to be passed to a single transport - or if the transport has
3115 a host list with hosts_override set, use the host list supplied with the
3116 transport. It is an error for this not to exist. */
3117
3118 if (hostlist == NULL || (ob->hosts_override && ob->hosts != NULL))
3119 {
3120 if (ob->hosts == NULL)
3121 {
3122 addrlist->message = string_sprintf("%s transport called with no hosts set",
3123 tblock->name);
3124 addrlist->transport_return = PANIC;
3125 return FALSE; /* Only top address has status */
3126 }
3127
3128 DEBUG(D_transport) debug_printf("using the transport's hosts: %s\n",
3129 ob->hosts);
3130
3131 /* If the transport's host list contains no '$' characters, and we are not
3132 randomizing, it is fixed and therefore a chain of hosts can be built once
3133 and for all, and remembered for subsequent use by other calls to this
3134 transport. If, on the other hand, the host list does contain '$', or we are
3135 randomizing its order, we have to rebuild it each time. In the fixed case,
3136 as the hosts string will never be used again, it doesn't matter that we
3137 replace all the : characters with zeros. */
3138
3139 if (ob->hostlist == NULL)
3140 {
3141 uschar *s = ob->hosts;
3142
3143 if (Ustrchr(s, '$') != NULL)
3144 {
3145 if (!(expanded_hosts = expand_string(s)))
3146 {
3147 addrlist->message = string_sprintf("failed to expand list of hosts "
3148 "\"%s\" in %s transport: %s", s, tblock->name, expand_string_message);
3149 addrlist->transport_return = search_find_defer? DEFER : PANIC;
3150 return FALSE; /* Only top address has status */
3151 }
3152 DEBUG(D_transport) debug_printf("expanded list of hosts \"%s\" to "
3153 "\"%s\"\n", s, expanded_hosts);
3154 s = expanded_hosts;
3155 }
3156 else
3157 if (ob->hosts_randomize) s = expanded_hosts = string_copy(s);
3158
3159 host_build_hostlist(&hostlist, s, ob->hosts_randomize);
3160
3161 /* Check that the expansion yielded something useful. */
3162 if (hostlist == NULL)
3163 {
3164 addrlist->message =
3165 string_sprintf("%s transport has empty hosts setting", tblock->name);
3166 addrlist->transport_return = PANIC;
3167 return FALSE; /* Only top address has status */
3168 }
3169
3170 /* If there was no expansion of hosts, save the host list for
3171 next time. */
3172
3173 if (!expanded_hosts) ob->hostlist = hostlist;
3174 }
3175
3176 /* This is not the first time this transport has been run in this delivery;
3177 the host list was built previously. */
3178
3179 else
3180 hostlist = ob->hostlist;
3181 }
3182
3183 /* The host list was supplied with the address. If hosts_randomize is set, we
3184 must sort it into a random order if it did not come from MX records and has not
3185 already been randomized (but don't bother if continuing down an existing
3186 connection). */
3187
3188 else if (ob->hosts_randomize && hostlist->mx == MX_NONE && !continuing)
3189 {
3190 host_item *newlist = NULL;
3191 while (hostlist != NULL)
3192 {
3193 host_item *h = hostlist;
3194 hostlist = hostlist->next;
3195
3196 h->sort_key = random_number(100);
3197
3198 if (newlist == NULL)
3199 {
3200 h->next = NULL;
3201 newlist = h;
3202 }
3203 else if (h->sort_key < newlist->sort_key)
3204 {
3205 h->next = newlist;
3206 newlist = h;
3207 }
3208 else
3209 {
3210 host_item *hh = newlist;
3211 while (hh->next != NULL)
3212 {
3213 if (h->sort_key < hh->next->sort_key) break;
3214 hh = hh->next;
3215 }
3216 h->next = hh->next;
3217 hh->next = h;
3218 }
3219 }
3220
3221 hostlist = addrlist->host_list = newlist;
3222 }
3223
3224 /* Sort out the default port. */
3225
3226 if (!smtp_get_port(ob->port, addrlist, &port, tid)) return FALSE;
3227
3228 /* For each host-plus-IP-address on the list:
3229
3230 . If this is a continued delivery and the host isn't the one with the
3231 current connection, skip.
3232
3233 . If the status is unusable (i.e. previously failed or retry checked), skip.
3234
3235 . If no IP address set, get the address, either by turning the name into
3236 an address, calling gethostbyname if gethostbyname is on, or by calling
3237 the DNS. The DNS may yield multiple addresses, in which case insert the
3238 extra ones into the list.
3239
3240 . Get the retry data if not previously obtained for this address and set the
3241 field which remembers the state of this address. Skip if the retry time is
3242 not reached. If not, remember whether retry data was found. The retry string
3243 contains both the name and the IP address.
3244
3245 . Scan the list of addresses and mark those whose status is DEFER as
3246 PENDING_DEFER. These are the only ones that will be processed in this cycle
3247 of the hosts loop.
3248
3249 . Make a delivery attempt - addresses marked PENDING_DEFER will be tried.
3250 Some addresses may be successfully delivered, others may fail, and yet
3251 others may get temporary errors and so get marked DEFER.
3252
3253 . The return from the delivery attempt is OK if a connection was made and a
3254 valid SMTP dialogue was completed. Otherwise it is DEFER.
3255
3256 . If OK, add a "remove" retry item for this host/IPaddress, if any.
3257
3258 . If fail to connect, or other defer state, add a retry item.
3259
3260 . If there are any addresses whose status is still DEFER, carry on to the
3261 next host/IPaddress, unless we have tried the number of hosts given
3262 by hosts_max_try or hosts_max_try_hardlimit; otherwise return. Note that
3263 there is some fancy logic for hosts_max_try that means its limit can be
3264 overstepped in some circumstances.
3265
3266 If we get to the end of the list, all hosts have deferred at least one address,
3267 or not reached their retry times. If delay_after_cutoff is unset, it requests a
3268 delivery attempt to those hosts whose last try was before the arrival time of
3269 the current message. To cope with this, we have to go round the loop a second
3270 time. After that, set the status and error data for any addresses that haven't
3271 had it set already. */
3272
3273 for (cutoff_retry = 0; expired &&
3274 cutoff_retry < ((ob->delay_after_cutoff)? 1 : 2);
3275 cutoff_retry++)
3276 {
3277 host_item *nexthost = NULL;
3278 int unexpired_hosts_tried = 0;
3279
3280 for (host = hostlist;
3281 host != NULL &&
3282 unexpired_hosts_tried < ob->hosts_max_try &&
3283 total_hosts_tried < ob->hosts_max_try_hardlimit;
3284 host = nexthost)
3285 {
3286 int rc;
3287 int host_af;
3288 uschar *rs;
3289 BOOL serialized = FALSE;
3290 BOOL host_is_expired = FALSE;
3291 BOOL message_defer = FALSE;
3292 BOOL some_deferred = FALSE;
3293 address_item *first_addr = NULL;
3294 uschar *interface = NULL;
3295 uschar *retry_host_key = NULL;
3296 uschar *retry_message_key = NULL;
3297 uschar *serialize_key = NULL;
3298
3299 /* Default next host is next host. :-) But this can vary if the
3300 hosts_max_try limit is hit (see below). It may also be reset if a host
3301 address is looked up here (in case the host was multihomed). */
3302
3303 nexthost = host->next;
3304
3305 /* If the address hasn't yet been obtained from the host name, look it up
3306 now, unless the host is already marked as unusable. If it is marked as
3307 unusable, it means that the router was unable to find its IP address (in
3308 the DNS or wherever) OR we are in the 2nd time round the cutoff loop, and
3309 the lookup failed last time. We don't get this far if *all* MX records
3310 point to non-existent hosts; that is treated as a hard error.
3311
3312 We can just skip this host entirely. When the hosts came from the router,
3313 the address will timeout based on the other host(s); when the address is
3314 looked up below, there is an explicit retry record added.
3315
3316 Note that we mustn't skip unusable hosts if the address is not unset; they
3317 may be needed as expired hosts on the 2nd time round the cutoff loop. */
3318
3319 if (host->address == NULL)
3320 {
3321 int new_port, flags;
3322 host_item *hh;
3323
3324 if (host->status >= hstatus_unusable)
3325 {
3326 DEBUG(D_transport) debug_printf("%s has no address and is unusable - skipping\n",
3327 host->name);
3328 continue;
3329 }
3330
3331 DEBUG(D_transport) debug_printf("getting address for %s\n", host->name);
3332
3333 /* The host name is permitted to have an attached port. Find it, and
3334 strip it from the name. Just remember it for now. */
3335
3336 new_port = host_item_get_port(host);
3337
3338 /* Count hosts looked up */
3339
3340 hosts_looked_up++;
3341
3342 /* Find by name if so configured, or if it's an IP address. We don't
3343 just copy the IP address, because we need the test-for-local to happen. */
3344
3345 flags = HOST_FIND_BY_A;
3346 if (ob->dns_qualify_single) flags |= HOST_FIND_QUALIFY_SINGLE;
3347 if (ob->dns_search_parents) flags |= HOST_FIND_SEARCH_PARENTS;
3348
3349 if (ob->gethostbyname || string_is_ip_address(host->name, NULL) != 0)
3350 rc = host_find_byname(host, NULL, flags, NULL, TRUE);
3351 else
3352 rc = host_find_bydns(host, NULL, flags, NULL, NULL, NULL,
3353 &ob->dnssec, /* domains for request/require */
3354 NULL, NULL);
3355
3356 /* Update the host (and any additional blocks, resulting from
3357 multihoming) with a host-specific port, if any. */
3358
3359 for (hh = host; hh != nexthost; hh = hh->next) hh->port = new_port;
3360
3361 /* Failure to find the host at this time (usually DNS temporary failure)
3362 is really a kind of routing failure rather than a transport failure.
3363 Therefore we add a retry item of the routing kind, not to stop us trying
3364 to look this name up here again, but to ensure the address gets timed
3365 out if the failures go on long enough. A complete failure at this point
3366 commonly points to a configuration error, but the best action is still
3367 to carry on for the next host. */
3368
3369 if (rc == HOST_FIND_AGAIN || rc == HOST_FIND_FAILED)
3370 {
3371 retry_add_item(addrlist, string_sprintf("R:%s", host->name), 0);
3372 expired = FALSE;
3373 if (rc == HOST_FIND_AGAIN) hosts_defer++; else hosts_fail++;
3374 DEBUG(D_transport) debug_printf("rc = %s for %s\n", (rc == HOST_FIND_AGAIN)?
3375 "HOST_FIND_AGAIN" : "HOST_FIND_FAILED", host->name);
3376 host->status = hstatus_unusable;
3377
3378 for (addr = addrlist; addr != NULL; addr = addr->next)
3379 {
3380 if (addr->transport_return != DEFER) continue;
3381 addr->basic_errno = ERRNO_UNKNOWNHOST;
3382 addr->message =
3383 string_sprintf("failed to lookup IP address for %s", host->name);
3384 }
3385 continue;
3386 }
3387
3388 /* If the host is actually the local host, we may have a problem, or
3389 there may be some cunning configuration going on. In the problem case,
3390 log things and give up. The default transport status is already DEFER. */
3391
3392 if (rc == HOST_FOUND_LOCAL && !ob->allow_localhost)
3393 {
3394 for (addr = addrlist; addr != NULL; addr = addr->next)
3395 {
3396 addr->basic_errno = 0;
3397 addr->message = string_sprintf("%s transport found host %s to be "
3398 "local", tblock->name, host->name);
3399 }
3400 goto END_TRANSPORT;
3401 }
3402 } /* End of block for IP address lookup */
3403
3404 /* If this is a continued delivery, we are interested only in the host
3405 which matches the name of the existing open channel. The check is put
3406 here after the local host lookup, in case the name gets expanded as a
3407 result of the lookup. Set expired FALSE, to save the outer loop executing
3408 twice. */
3409
3410 if (continuing && (Ustrcmp(continue_hostname, host->name) != 0 ||
3411 Ustrcmp(continue_host_address, host->address) != 0))
3412 {
3413 expired = FALSE;
3414 continue; /* With next host */
3415 }
3416
3417 /* Reset the default next host in case a multihomed host whose addresses
3418 are not looked up till just above added to the host list. */
3419
3420 nexthost = host->next;
3421
3422 /* If queue_smtp is set (-odqs or the first part of a 2-stage run), or the
3423 domain is in queue_smtp_domains, we don't actually want to attempt any
3424 deliveries. When doing a queue run, queue_smtp_domains is always unset. If
3425 there is a lookup defer in queue_smtp_domains, proceed as if the domain
3426 were not in it. We don't want to hold up all SMTP deliveries! Except when
3427 doing a two-stage queue run, don't do this if forcing. */
3428
3429 if ((!deliver_force || queue_2stage) && (queue_smtp ||
3430 match_isinlist(addrlist->domain,
3431 (const uschar **)&queue_smtp_domains, 0,
3432 &domainlist_anchor, NULL, MCL_DOMAIN, TRUE, NULL) == OK))
3433 {
3434 expired = FALSE;
3435 for (addr = addrlist; addr != NULL; addr = addr->next)
3436 {
3437 if (addr->transport_return != DEFER) continue;
3438 addr->message = US"domain matches queue_smtp_domains, or -odqs set";
3439 }
3440 continue; /* With next host */
3441 }
3442
3443 /* Count hosts being considered - purely for an intelligent comment
3444 if none are usable. */
3445
3446 hosts_total++;
3447
3448 /* Set $host and $host address now in case they are needed for the
3449 interface expansion or the serialize_hosts check; they remain set if an
3450 actual delivery happens. */
3451
3452 deliver_host = host->name;
3453 deliver_host_address = host->address;
3454 lookup_dnssec_authenticated = host->dnssec == DS_YES ? US"yes"
3455 : host->dnssec == DS_NO ? US"no"
3456 : US"";
3457
3458 /* Set up a string for adding to the retry key if the port number is not
3459 the standard SMTP port. A host may have its own port setting that overrides
3460 the default. */
3461
3462 pistring = string_sprintf(":%d", (host->port == PORT_NONE)?
3463 port : host->port);
3464 if (Ustrcmp(pistring, ":25") == 0) pistring = US"";
3465
3466 /* Select IPv4 or IPv6, and choose an outgoing interface. If the interface
3467 string is set, even if constant (as different transports can have different
3468 constant settings), we must add it to the key that is used for retries,
3469 because connections to the same host from a different interface should be
3470 treated separately. */
3471
3472 host_af = (Ustrchr(host->address, ':') == NULL)? AF_INET : AF_INET6;
3473 if ((rs = ob->interface) && *rs)
3474 {
3475 if (!smtp_get_interface(rs, host_af, addrlist, &interface, tid))
3476 return FALSE;
3477 pistring = string_sprintf("%s/%s", pistring, interface);
3478 }
3479
3480 /* The first time round the outer loop, check the status of the host by
3481 inspecting the retry data. The second time round, we are interested only
3482 in expired hosts that haven't been tried since this message arrived. */
3483
3484 if (cutoff_retry == 0)
3485 {
3486 BOOL incl_ip;
3487 /* Ensure the status of the address is set by checking retry data if
3488 necessary. There may be host-specific retry data (applicable to all
3489 messages) and also data for retries of a specific message at this host.
3490 If either of these retry records are actually read, the keys used are
3491 returned to save recomputing them later. */
3492
3493 if (exp_bool(addrlist, US"transport", tblock->name, D_transport,
3494 US"retry_include_ip_address", ob->retry_include_ip_address,
3495 ob->expand_retry_include_ip_address, &incl_ip) != OK)
3496 continue; /* with next host */
3497
3498 host_is_expired = retry_check_address(addrlist->domain, host, pistring,
3499 incl_ip, &retry_host_key, &retry_message_key);
3500
3501 DEBUG(D_transport) debug_printf("%s [%s]%s status = %s\n", host->name,
3502 (host->address == NULL)? US"" : host->address, pistring,
3503 (host->status == hstatus_usable)? "usable" :
3504 (host->status == hstatus_unusable)? "unusable" :
3505 (host->status == hstatus_unusable_expired)? "unusable (expired)" : "?");
3506
3507 /* Skip this address if not usable at this time, noting if it wasn't
3508 actually expired, both locally and in the address. */
3509
3510 switch (host->status)
3511 {
3512 case hstatus_unusable:
3513 expired = FALSE;
3514 setflag(addrlist, af_retry_skipped);
3515 /* Fall through */
3516
3517 case hstatus_unusable_expired:
3518 switch (host->why)
3519 {
3520 case hwhy_retry: hosts_retry++; break;
3521 case hwhy_failed: hosts_fail++; break;
3522 case hwhy_deferred: hosts_defer++; break;
3523 }
3524
3525 /* If there was a retry message key, implying that previously there
3526 was a message-specific defer, we don't want to update the list of
3527 messages waiting for these hosts. */
3528
3529 if (retry_message_key != NULL) update_waiting = FALSE;
3530 continue; /* With the next host or IP address */
3531 }
3532 }
3533
3534 /* Second time round the loop: if the address is set but expired, and
3535 the message is newer than the last try, let it through. */
3536
3537 else
3538 {
3539 if (host->address == NULL ||
3540 host->status != hstatus_unusable_expired ||
3541 host->last_try > received_time)
3542 continue;
3543 DEBUG(D_transport)
3544 debug_printf("trying expired host %s [%s]%s\n",
3545 host->name, host->address, pistring);
3546 host_is_expired = TRUE;
3547 }
3548
3549 /* Setting "expired=FALSE" doesn't actually mean not all hosts are expired;
3550 it remains TRUE only if all hosts are expired and none are actually tried.
3551 */
3552
3553 expired = FALSE;
3554
3555 /* If this host is listed as one to which access must be serialized,
3556 see if another Exim process has a connection to it, and if so, skip
3557 this host. If not, update the database to record our connection to it
3558 and remember this for later deletion. Do not do any of this if we are
3559 sending the message down a pre-existing connection. */
3560
3561 if (!continuing &&
3562 verify_check_given_host(&ob->serialize_hosts, host) == OK)
3563 {
3564 serialize_key = string_sprintf("host-serialize-%s", host->name);
3565 if (!enq_start(serialize_key, 1))
3566 {
3567 DEBUG(D_transport)
3568 debug_printf("skipping host %s because another Exim process "
3569 "is connected to it\n", host->name);
3570 hosts_serial++;
3571 continue;
3572 }
3573 serialized = TRUE;
3574 }
3575
3576 /* OK, we have an IP address that is not waiting for its retry time to
3577 arrive (it might be expired) OR (second time round the loop) we have an
3578 expired host that hasn't been tried since the message arrived. Have a go
3579 at delivering the message to it. First prepare the addresses by flushing
3580 out the result of previous attempts, and finding the first address that
3581 is still to be delivered. */
3582
3583 first_addr = prepare_addresses(addrlist, host);
3584
3585 DEBUG(D_transport) debug_printf("delivering %s to %s [%s] (%s%s)\n",
3586 message_id, host->name, host->address, addrlist->address,
3587 (addrlist->next == NULL)? "" : ", ...");
3588
3589 set_process_info("delivering %s to %s [%s] (%s%s)",
3590 message_id, host->name, host->address, addrlist->address,
3591 (addrlist->next == NULL)? "" : ", ...");
3592
3593 /* This is not for real; don't do the delivery. If there are
3594 any remaining hosts, list them. */
3595
3596 if (dont_deliver)
3597 {
3598 host_item *host2;
3599 set_errno_nohost(addrlist, 0, NULL, OK, FALSE);
3600 for (addr = addrlist; addr != NULL; addr = addr->next)
3601 {
3602 addr->host_used = host;
3603 addr->special_action = '*';
3604 addr->message = US"delivery bypassed by -N option";
3605 }
3606 DEBUG(D_transport)
3607 {
3608 debug_printf("*** delivery by %s transport bypassed by -N option\n"
3609 "*** host and remaining hosts:\n", tblock->name);
3610 for (host2 = host; host2 != NULL; host2 = host2->next)
3611 debug_printf(" %s [%s]\n", host2->name,
3612 (host2->address == NULL)? US"unset" : host2->address);
3613 }
3614 rc = OK;
3615 }
3616
3617 /* This is for real. If the host is expired, we don't count it for
3618 hosts_max_retry. This ensures that all hosts must expire before an address
3619 is timed out, unless hosts_max_try_hardlimit (which protects against
3620 lunatic DNS configurations) is reached.
3621
3622 If the host is not expired and we are about to hit the hosts_max_retry
3623 limit, check to see if there is a subsequent hosts with a different MX
3624 value. If so, make that the next host, and don't count this one. This is a
3625 heuristic to make sure that different MXs do get tried. With a normal kind
3626 of retry rule, they would get tried anyway when the earlier hosts were
3627 delayed, but if the domain has a "retry every time" type of rule - as is
3628 often used for the the very large ISPs, that won't happen. */
3629
3630 else
3631 {
3632 host_item * thost;
3633 /* Make a copy of the host if it is local to this invocation
3634 of the transport. */
3635
3636 if (expanded_hosts)
3637 {
3638 thost = store_get(sizeof(host_item));
3639 *thost = *host;
3640 thost->name = string_copy(host->name);
3641 thost->address = string_copy(host->address);
3642 }
3643 else
3644 thost = host;
3645
3646 if (!host_is_expired && ++unexpired_hosts_tried >= ob->hosts_max_try)
3647 {
3648 host_item *h;
3649 DEBUG(D_transport)
3650 debug_printf("hosts_max_try limit reached with this host\n");
3651 for (h = host; h; h = h->next) if (h->mx != host->mx)
3652 {
3653 nexthost = h;
3654 unexpired_hosts_tried--;
3655 DEBUG(D_transport) debug_printf("however, a higher MX host exists "
3656 "and will be tried\n");
3657 break;
3658 }
3659 }
3660
3661 /* Attempt the delivery. */
3662
3663 total_hosts_tried++;
3664 rc = smtp_deliver(addrlist, thost, host_af, port, interface, tblock,
3665 &message_defer, FALSE);
3666
3667 /* Yield is one of:
3668 OK => connection made, each address contains its result;
3669 message_defer is set for message-specific defers (when all
3670 recipients are marked defer)
3671 DEFER => there was a non-message-specific delivery problem;
3672 ERROR => there was a problem setting up the arguments for a filter,
3673 or there was a problem with expanding added headers
3674 */
3675
3676 /* If the result is not OK, there was a non-message-specific problem.
3677 If the result is DEFER, we need to write to the logs saying what happened
3678 for this particular host, except in the case of authentication and TLS
3679 failures, where the log has already been written. If all hosts defer a
3680 general message is written at the end. */
3681
3682 if (rc == DEFER && first_addr->basic_errno != ERRNO_AUTHFAIL &&
3683 first_addr->basic_errno != ERRNO_TLSFAILURE)
3684 write_logs(first_addr, host);
3685
3686 #ifndef DISABLE_EVENT
3687 if (rc == DEFER)
3688 deferred_event_raise(first_addr, host);
3689 #endif
3690
3691 /* If STARTTLS was accepted, but there was a failure in setting up the
3692 TLS session (usually a certificate screwup), and the host is not in
3693 hosts_require_tls, and tls_tempfail_tryclear is true, try again, with
3694 TLS forcibly turned off. We have to start from scratch with a new SMTP
3695 connection. That's why the retry is done from here, not from within
3696 smtp_deliver(). [Rejections of STARTTLS itself don't screw up the
3697 session, so the in-clear transmission after those errors, if permitted,
3698 happens inside smtp_deliver().] */
3699
3700 #ifdef SUPPORT_TLS
3701 if ( rc == DEFER
3702 && first_addr->basic_errno == ERRNO_TLSFAILURE
3703 && ob->tls_tempfail_tryclear
3704 && verify_check_given_host(&ob->hosts_require_tls, host) != OK
3705 )
3706 {
3707 log_write(0, LOG_MAIN, "TLS session failure: delivering unencrypted "
3708 "to %s [%s] (not in hosts_require_tls)", host->name, host->address);
3709 first_addr = prepare_addresses(addrlist, host);
3710 rc = smtp_deliver(addrlist, thost, host_af, port, interface, tblock,
3711 &message_defer, TRUE);
3712 if (rc == DEFER && first_addr->basic_errno != ERRNO_AUTHFAIL)
3713 write_logs(first_addr, host);
3714 # ifndef DISABLE_EVENT
3715 if (rc == DEFER)
3716 deferred_event_raise(first_addr, host);
3717 # endif
3718 }
3719 #endif /*SUPPORT_TLS*/
3720 }
3721
3722 /* Delivery attempt finished */
3723
3724 rs = (rc == OK)? US"OK" : (rc == DEFER)? US"DEFER" : (rc == ERROR)?
3725 US"ERROR" : US"?";
3726
3727 set_process_info("delivering %s: just tried %s [%s] for %s%s: result %s",
3728 message_id, host->name, host->address, addrlist->address,
3729 (addrlist->next == NULL)? "" : " (& others)", rs);
3730
3731 /* Release serialization if set up */
3732
3733 if (serialized) enq_end(serialize_key);
3734
3735 /* If the result is DEFER, or if a host retry record is known to exist, we
3736 need to add an item to the retry chain for updating the retry database
3737 at the end of delivery. We only need to add the item to the top address,
3738 of course. Also, if DEFER, we mark the IP address unusable so as to skip it
3739 for any other delivery attempts using the same address. (It is copied into
3740 the unusable tree at the outer level, so even if different address blocks
3741 contain the same address, it still won't get tried again.) */
3742
3743 if (rc == DEFER || retry_host_key != NULL)
3744 {
3745 int delete_flag = (rc != DEFER)? rf_delete : 0;
3746 if (retry_host_key == NULL)
3747 {
3748 BOOL incl_ip;
3749 if (exp_bool(addrlist, US"transport", tblock->name, D_transport,
3750 US"retry_include_ip_address", ob->retry_include_ip_address,
3751 ob->expand_retry_include_ip_address, &incl_ip) != OK)
3752 incl_ip = TRUE; /* error; use most-specific retry record */
3753
3754 retry_host_key = incl_ip ?
3755 string_sprintf("T:%S:%s%s", host->name, host->address, pistring) :
3756 string_sprintf("T:%S%s", host->name, pistring);
3757 }
3758
3759 /* If a delivery of another message over an existing SMTP connection
3760 yields DEFER, we do NOT set up retry data for the host. This covers the
3761 case when there are delays in routing the addresses in the second message
3762 that are so long that the server times out. This is alleviated by not
3763 routing addresses that previously had routing defers when handling an
3764 existing connection, but even so, this case may occur (e.g. if a
3765 previously happily routed address starts giving routing defers). If the
3766 host is genuinely down, another non-continued message delivery will
3767 notice it soon enough. */
3768
3769 if (delete_flag != 0 || !continuing)
3770 retry_add_item(first_addr, retry_host_key, rf_host | delete_flag);
3771
3772 /* We may have tried an expired host, if its retry time has come; ensure
3773 the status reflects the expiry for the benefit of any other addresses. */
3774
3775 if (rc == DEFER)
3776 {
3777 host->status = (host_is_expired)?
3778 hstatus_unusable_expired : hstatus_unusable;
3779 host->why = hwhy_deferred;
3780 }
3781 }
3782
3783 /* If message_defer is set (host was OK, but every recipient got deferred
3784 because of some message-specific problem), or if that had happened
3785 previously so that a message retry key exists, add an appropriate item
3786 to the retry chain. Note that if there was a message defer but now there is
3787 a host defer, the message defer record gets deleted. That seems perfectly
3788 reasonable. Also, stop the message from being remembered as waiting
3789 for specific hosts. */
3790
3791 if (message_defer || retry_message_key != NULL)
3792 {
3793 int delete_flag = message_defer? 0 : rf_delete;
3794 if (retry_message_key == NULL)
3795 {
3796 BOOL incl_ip;
3797 if (exp_bool(addrlist, US"transport", tblock->name, D_transport,
3798 US"retry_include_ip_address", ob->retry_include_ip_address,
3799 ob->expand_retry_include_ip_address, &incl_ip) != OK)
3800 incl_ip = TRUE; /* error; use most-specific retry record */
3801
3802 retry_message_key = incl_ip ?
3803 string_sprintf("T:%S:%s%s:%s", host->name, host->address, pistring,
3804 message_id) :
3805 string_sprintf("T:%S%s:%s", host->name, pistring, message_id);
3806 }
3807 retry_add_item(addrlist, retry_message_key,
3808 rf_message | rf_host | delete_flag);
3809 update_waiting = FALSE;
3810 }
3811
3812 /* Any return other than DEFER (that is, OK or ERROR) means that the
3813 addresses have got their final statuses filled in for this host. In the OK
3814 case, see if any of them are deferred. */
3815
3816 if (rc == OK)
3817 for (addr = addrlist; addr; addr = addr->next)
3818 if (addr->transport_return == DEFER)
3819 {
3820 some_deferred = TRUE;
3821 break;
3822 }
3823
3824 /* If no addresses deferred or the result was ERROR, return. We do this for
3825 ERROR because a failing filter set-up or add_headers expansion is likely to
3826 fail for any host we try. */
3827
3828 if (rc == ERROR || (rc == OK && !some_deferred))
3829 {
3830 DEBUG(D_transport) debug_printf("Leaving %s transport\n", tblock->name);
3831 return TRUE; /* Each address has its status */
3832 }
3833
3834 /* If the result was DEFER or some individual addresses deferred, let
3835 the loop run to try other hosts with the deferred addresses, except for the
3836 case when we were trying to deliver down an existing channel and failed.
3837 Don't try any other hosts in this case. */
3838
3839 if (continuing) break;
3840
3841 /* If the whole delivery, or some individual addresses, were deferred and
3842 there are more hosts that could be tried, do not count this host towards
3843 the hosts_max_try limit if the age of the message is greater than the
3844 maximum retry time for this host. This means we may try try all hosts,
3845 ignoring the limit, when messages have been around for some time. This is
3846 important because if we don't try all hosts, the address will never time
3847 out. NOTE: this does not apply to hosts_max_try_hardlimit. */
3848
3849 if ((rc == DEFER || some_deferred) && nexthost != NULL)
3850 {
3851 BOOL timedout;
3852 retry_config *retry = retry_find_config(host->name, NULL, 0, 0);
3853
3854 if (retry != NULL && retry->rules != NULL)
3855 {
3856 retry_rule *last_rule;
3857 for (last_rule = retry->rules;
3858 last_rule->next != NULL;
3859 last_rule = last_rule->next);
3860 timedout = time(NULL) - received_time > last_rule->timeout;
3861 }
3862 else timedout = TRUE; /* No rule => timed out */
3863
3864 if (timedout)
3865 {
3866 unexpired_hosts_tried--;
3867 DEBUG(D_transport) debug_printf("temporary delivery error(s) override "
3868 "hosts_max_try (message older than host's retry time)\n");
3869 }
3870 }
3871 } /* End of loop for trying multiple hosts. */
3872
3873 /* This is the end of the loop that repeats iff expired is TRUE and
3874 ob->delay_after_cutoff is FALSE. The second time round we will
3875 try those hosts that haven't been tried since the message arrived. */
3876
3877 DEBUG(D_transport)
3878 {
3879 debug_printf("all IP addresses skipped or deferred at least one address\n");
3880 if (expired && !ob->delay_after_cutoff && cutoff_retry == 0)
3881 debug_printf("retrying IP addresses not tried since message arrived\n");