3d12988e8969ce5aa1fd4451e87541e6cdbbeafe
[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_canon) },
48 { "dkim_domain", opt_stringptr,
49 (void *)offsetof(smtp_transport_options_block, dkim_domain) },
50 { "dkim_private_key", opt_stringptr,
51 (void *)offsetof(smtp_transport_options_block, dkim_private_key) },
52 { "dkim_selector", opt_stringptr,
53 (void *)offsetof(smtp_transport_options_block, dkim_selector) },
54 { "dkim_sign_headers", opt_stringptr,
55 (void *)offsetof(smtp_transport_options_block, dkim_sign_headers) },
56 { "dkim_strict", opt_stringptr,
57 (void *)offsetof(smtp_transport_options_block, dkim_strict) },
58 #endif
59 { "dns_qualify_single", opt_bool,
60 (void *)offsetof(smtp_transport_options_block, dns_qualify_single) },
61 { "dns_search_parents", opt_bool,
62 (void *)offsetof(smtp_transport_options_block, dns_search_parents) },
63 { "dnssec_request_domains", opt_stringptr,
64 (void *)offsetof(smtp_transport_options_block, dnssec.request) },
65 { "dnssec_require_domains", opt_stringptr,
66 (void *)offsetof(smtp_transport_options_block, dnssec.require) },
67 { "dscp", opt_stringptr,
68 (void *)offsetof(smtp_transport_options_block, dscp) },
69 { "fallback_hosts", opt_stringptr,
70 (void *)offsetof(smtp_transport_options_block, fallback_hosts) },
71 { "final_timeout", opt_time,
72 (void *)offsetof(smtp_transport_options_block, final_timeout) },
73 { "gethostbyname", opt_bool,
74 (void *)offsetof(smtp_transport_options_block, gethostbyname) },
75 { "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 #if defined(SUPPORT_TLS) && defined(EXPERIMENTAL_DANE)
120 { "hosts_try_dane", opt_stringptr,
121 (void *)offsetof(smtp_transport_options_block, hosts_try_dane) },
122 #endif
123 #ifndef DISABLE_PRDR
124 { "hosts_try_prdr", opt_stringptr,
125 (void *)offsetof(smtp_transport_options_block, hosts_try_prdr) },
126 #endif
127 #ifdef SUPPORT_TLS
128 { "hosts_verify_avoid_tls", opt_stringptr,
129 (void *)offsetof(smtp_transport_options_block, hosts_verify_avoid_tls) },
130 #endif
131 { "interface", opt_stringptr,
132 (void *)offsetof(smtp_transport_options_block, interface) },
133 { "keepalive", opt_bool,
134 (void *)offsetof(smtp_transport_options_block, keepalive) },
135 { "lmtp_ignore_quota", opt_bool,
136 (void *)offsetof(smtp_transport_options_block, lmtp_ignore_quota) },
137 { "max_rcpt", opt_int | opt_public,
138 (void *)offsetof(transport_instance, max_addresses) },
139 { "multi_domain", opt_expand_bool | opt_public,
140 (void *)offsetof(transport_instance, multi_domain) },
141 { "port", opt_stringptr,
142 (void *)offsetof(smtp_transport_options_block, port) },
143 { "protocol", opt_stringptr,
144 (void *)offsetof(smtp_transport_options_block, protocol) },
145 { "retry_include_ip_address", opt_expand_bool,
146 (void *)offsetof(smtp_transport_options_block, retry_include_ip_address) },
147 { "serialize_hosts", opt_stringptr,
148 (void *)offsetof(smtp_transport_options_block, serialize_hosts) },
149 { "size_addition", opt_int,
150 (void *)offsetof(smtp_transport_options_block, size_addition) }
151 #ifdef SUPPORT_SOCKS
152 ,{ "socks_proxy", opt_stringptr,
153 (void *)offsetof(smtp_transport_options_block, socks_proxy) }
154 #endif
155 #ifdef SUPPORT_TLS
156 ,{ "tls_certificate", opt_stringptr,
157 (void *)offsetof(smtp_transport_options_block, tls_certificate) },
158 { "tls_crl", opt_stringptr,
159 (void *)offsetof(smtp_transport_options_block, tls_crl) },
160 { "tls_dh_min_bits", opt_int,
161 (void *)offsetof(smtp_transport_options_block, tls_dh_min_bits) },
162 { "tls_privatekey", opt_stringptr,
163 (void *)offsetof(smtp_transport_options_block, tls_privatekey) },
164 { "tls_require_ciphers", opt_stringptr,
165 (void *)offsetof(smtp_transport_options_block, tls_require_ciphers) },
166 { "tls_sni", opt_stringptr,
167 (void *)offsetof(smtp_transport_options_block, tls_sni) },
168 { "tls_tempfail_tryclear", opt_bool,
169 (void *)offsetof(smtp_transport_options_block, tls_tempfail_tryclear) },
170 { "tls_try_verify_hosts", opt_stringptr,
171 (void *)offsetof(smtp_transport_options_block, tls_try_verify_hosts) },
172 { "tls_verify_cert_hostnames", opt_stringptr,
173 (void *)offsetof(smtp_transport_options_block,tls_verify_cert_hostnames)},
174 { "tls_verify_certificates", opt_stringptr,
175 (void *)offsetof(smtp_transport_options_block, tls_verify_certificates) },
176 { "tls_verify_hosts", opt_stringptr,
177 (void *)offsetof(smtp_transport_options_block, tls_verify_hosts) }
178 #endif
179 };
180
181 /* Size of the options list. An extern variable has to be used so that its
182 address can appear in the tables drtables.c. */
183
184 int smtp_transport_options_count =
185 sizeof(smtp_transport_options)/sizeof(optionlist);
186
187 /* Default private options block for the smtp transport. */
188
189 smtp_transport_options_block smtp_transport_option_defaults = {
190 NULL, /* hosts */
191 NULL, /* fallback_hosts */
192 NULL, /* hostlist */
193 NULL, /* fallback_hostlist */
194 NULL, /* authenticated_sender */
195 US"$primary_hostname", /* helo_data */
196 NULL, /* interface */
197 NULL, /* port */
198 US"smtp", /* protocol */
199 NULL, /* DSCP */
200 NULL, /* serialize_hosts */
201 NULL, /* hosts_try_auth */
202 NULL, /* hosts_require_auth */
203 #ifdef EXPERIMENTAL_DANE
204 NULL, /* hosts_try_dane */
205 NULL, /* hosts_require_dane */
206 #endif
207 #ifndef DISABLE_PRDR
208 US"*", /* hosts_try_prdr */
209 #endif
210 #ifndef DISABLE_OCSP
211 US"*", /* hosts_request_ocsp (except under DANE; tls_client_start()) */
212 NULL, /* hosts_require_ocsp */
213 #endif
214 NULL, /* hosts_require_tls */
215 NULL, /* hosts_avoid_tls */
216 NULL, /* hosts_verify_avoid_tls */
217 NULL, /* hosts_avoid_pipelining */
218 NULL, /* hosts_avoid_esmtp */
219 NULL, /* hosts_nopass_tls */
220 5*60, /* command_timeout */
221 5*60, /* connect_timeout; shorter system default overrides */
222 5*60, /* data timeout */
223 10*60, /* final timeout */
224 1024, /* size_addition */
225 5, /* hosts_max_try */
226 50, /* hosts_max_try_hardlimit */
227 TRUE, /* address_retry_include_sender */
228 FALSE, /* allow_localhost */
229 FALSE, /* authenticated_sender_force */
230 FALSE, /* gethostbyname */
231 TRUE, /* dns_qualify_single */
232 FALSE, /* dns_search_parents */
233 { NULL, NULL }, /* dnssec_domains {request,require} */
234 TRUE, /* delay_after_cutoff */
235 FALSE, /* hosts_override */
236 FALSE, /* hosts_randomize */
237 TRUE, /* keepalive */
238 FALSE, /* lmtp_ignore_quota */
239 NULL, /* expand_retry_include_ip_address */
240 TRUE /* retry_include_ip_address */
241 #ifdef SUPPORT_SOCKS
242 ,NULL /* socks_proxy */
243 #endif
244 #ifdef SUPPORT_TLS
245 ,NULL, /* tls_certificate */
246 NULL, /* tls_crl */
247 NULL, /* tls_privatekey */
248 NULL, /* tls_require_ciphers */
249 NULL, /* tls_sni */
250 US"system", /* tls_verify_certificates */
251 EXIM_CLIENT_DH_DEFAULT_MIN_BITS,
252 /* tls_dh_min_bits */
253 TRUE, /* tls_tempfail_tryclear */
254 NULL, /* tls_verify_hosts */
255 US"*", /* tls_try_verify_hosts */
256 US"*" /* tls_verify_cert_hostnames */
257 #endif
258 #ifndef DISABLE_DKIM
259 ,NULL, /* dkim_canon */
260 NULL, /* dkim_domain */
261 NULL, /* dkim_private_key */
262 NULL, /* dkim_selector */
263 NULL, /* dkim_sign_headers */
264 NULL /* dkim_strict */
265 #endif
266 };
267
268 /* some DSN flags for use later */
269
270 static int rf_list[] = {rf_notify_never, rf_notify_success,
271 rf_notify_failure, rf_notify_delay };
272
273 static uschar *rf_names[] = { US"NEVER", US"SUCCESS", US"FAILURE", US"DELAY" };
274
275
276
277 /* Local statics */
278
279 static uschar *smtp_command; /* Points to last cmd for error messages */
280 static uschar *mail_command; /* Points to MAIL cmd for error messages */
281 static BOOL update_waiting; /* TRUE to update the "wait" database */
282
283
284 /*************************************************
285 * Setup entry point *
286 *************************************************/
287
288 /* This function is called when the transport is about to be used,
289 but before running it in a sub-process. It is used for two things:
290
291 (1) To set the fallback host list in addresses, when delivering.
292 (2) To pass back the interface, port, protocol, and other options, for use
293 during callout verification.
294
295 Arguments:
296 tblock pointer to the transport instance block
297 addrlist list of addresses about to be transported
298 tf if not NULL, pointer to block in which to return options
299 uid the uid that will be set (not used)
300 gid the gid that will be set (not used)
301 errmsg place for error message (not used)
302
303 Returns: OK always (FAIL, DEFER not used)
304 */
305
306 static int
307 smtp_transport_setup(transport_instance *tblock, address_item *addrlist,
308 transport_feedback *tf, uid_t uid, gid_t gid, uschar **errmsg)
309 {
310 smtp_transport_options_block *ob =
311 (smtp_transport_options_block *)(tblock->options_block);
312
313 errmsg = errmsg; /* Keep picky compilers happy */
314 uid = uid;
315 gid = gid;
316
317 /* Pass back options if required. This interface is getting very messy. */
318
319 if (tf != NULL)
320 {
321 tf->interface = ob->interface;
322 tf->port = ob->port;
323 tf->protocol = ob->protocol;
324 tf->hosts = ob->hosts;
325 tf->hosts_override = ob->hosts_override;
326 tf->hosts_randomize = ob->hosts_randomize;
327 tf->gethostbyname = ob->gethostbyname;
328 tf->qualify_single = ob->dns_qualify_single;
329 tf->search_parents = ob->dns_search_parents;
330 tf->helo_data = ob->helo_data;
331 }
332
333 /* Set the fallback host list for all the addresses that don't have fallback
334 host lists, provided that the local host wasn't present in the original host
335 list. */
336
337 if (!testflag(addrlist, af_local_host_removed))
338 {
339 for (; addrlist != NULL; addrlist = addrlist->next)
340 if (addrlist->fallback_hosts == NULL)
341 addrlist->fallback_hosts = ob->fallback_hostlist;
342 }
343
344 return OK;
345 }
346
347
348
349 /*************************************************
350 * Initialization entry point *
351 *************************************************/
352
353 /* Called for each instance, after its options have been read, to
354 enable consistency checks to be done, or anything else that needs
355 to be set up.
356
357 Argument: pointer to the transport instance block
358 Returns: nothing
359 */
360
361 void
362 smtp_transport_init(transport_instance *tblock)
363 {
364 smtp_transport_options_block *ob =
365 (smtp_transport_options_block *)(tblock->options_block);
366
367 /* Retry_use_local_part defaults FALSE if unset */
368
369 if (tblock->retry_use_local_part == TRUE_UNSET)
370 tblock->retry_use_local_part = FALSE;
371
372 /* Set the default port according to the protocol */
373
374 if (ob->port == NULL)
375 ob->port = (strcmpic(ob->protocol, US"lmtp") == 0)? US"lmtp" :
376 (strcmpic(ob->protocol, US"smtps") == 0)? US"smtps" : US"smtp";
377
378 /* Set up the setup entry point, to be called before subprocesses for this
379 transport. */
380
381 tblock->setup = smtp_transport_setup;
382
383 /* Complain if any of the timeouts are zero. */
384
385 if (ob->command_timeout <= 0 || ob->data_timeout <= 0 ||
386 ob->final_timeout <= 0)
387 log_write(0, LOG_PANIC_DIE|LOG_CONFIG,
388 "command, data, or final timeout value is zero for %s transport",
389 tblock->name);
390
391 /* If hosts_override is set and there are local hosts, set the global
392 flag that stops verify from showing router hosts. */
393
394 if (ob->hosts_override && ob->hosts != NULL) tblock->overrides_hosts = TRUE;
395
396 /* If there are any fallback hosts listed, build a chain of host items
397 for them, but do not do any lookups at this time. */
398
399 host_build_hostlist(&(ob->fallback_hostlist), ob->fallback_hosts, FALSE);
400 }
401
402
403
404
405
406 /*************************************************
407 * Set delivery info into all active addresses *
408 *************************************************/
409
410 /* Only addresses whose status is >= PENDING are relevant. A lesser
411 status means that an address is not currently being processed.
412
413 Arguments:
414 addrlist points to a chain of addresses
415 errno_value to put in each address's errno field
416 msg to put in each address's message field
417 rc to put in each address's transport_return field
418 pass_message if TRUE, set the "pass message" flag in the address
419 host if set, mark addrs as having used this host
420 smtp_greeting from peer
421 helo_response from peer
422
423 If errno_value has the special value ERRNO_CONNECTTIMEOUT, ETIMEDOUT is put in
424 the errno field, and RTEF_CTOUT is ORed into the more_errno field, to indicate
425 this particular type of timeout.
426
427 Returns: nothing
428 */
429
430 static void
431 set_errno(address_item *addrlist, int errno_value, uschar *msg, int rc,
432 BOOL pass_message, host_item * host
433 #ifdef EXPERIMENTAL_DSN_INFO
434 , const uschar * smtp_greeting, const uschar * helo_response
435 #endif
436 )
437 {
438 address_item *addr;
439 int orvalue = 0;
440 if (errno_value == ERRNO_CONNECTTIMEOUT)
441 {
442 errno_value = ETIMEDOUT;
443 orvalue = RTEF_CTOUT;
444 }
445 for (addr = addrlist; addr; addr = addr->next)
446 if (addr->transport_return >= PENDING)
447 {
448 addr->basic_errno = errno_value;
449 addr->more_errno |= orvalue;
450 if (msg != NULL)
451 {
452 addr->message = msg;
453 if (pass_message) setflag(addr, af_pass_message);
454 }
455 addr->transport_return = rc;
456 if (host)
457 {
458 addr->host_used = host;
459 #ifdef EXPERIMENTAL_DSN_INFO
460 if (smtp_greeting)
461 {uschar * s = Ustrchr(smtp_greeting, '\n'); if (s) *s = '\0';}
462 addr->smtp_greeting = smtp_greeting;
463
464 if (helo_response)
465 {uschar * s = Ustrchr(helo_response, '\n'); if (s) *s = '\0';}
466 addr->helo_response = helo_response;
467 #endif
468 }
469 }
470 }
471
472 static void
473 set_errno_nohost(address_item *addrlist, int errno_value, uschar *msg, int rc,
474 BOOL pass_message)
475 {
476 set_errno(addrlist, errno_value, msg, rc, pass_message, NULL
477 #ifdef EXPERIMENTAL_DSN_INFO
478 , NULL, NULL
479 #endif
480 );
481 }
482
483
484 /*************************************************
485 * Check an SMTP response *
486 *************************************************/
487
488 /* This function is given an errno code and the SMTP response buffer
489 to analyse, together with the host identification for generating messages. It
490 sets an appropriate message and puts the first digit of the response code into
491 the yield variable. If no response was actually read, a suitable digit is
492 chosen.
493
494 Arguments:
495 host the current host, to get its name for messages
496 errno_value pointer to the errno value
497 more_errno from the top address for use with ERRNO_FILTER_FAIL
498 buffer the SMTP response buffer
499 yield where to put a one-digit SMTP response code
500 message where to put an errror message
501 pass_message set TRUE if message is an SMTP response
502
503 Returns: TRUE if an SMTP "QUIT" command should be sent, else FALSE
504 */
505
506 static BOOL
507 check_response(host_item *host, int *errno_value, int more_errno,
508 uschar *buffer, int *yield, uschar **message, BOOL *pass_message)
509 {
510 uschar *pl = US"";
511
512 if (smtp_use_pipelining &&
513 (Ustrcmp(smtp_command, "MAIL") == 0 ||
514 Ustrcmp(smtp_command, "RCPT") == 0 ||
515 Ustrcmp(smtp_command, "DATA") == 0))
516 pl = US"pipelined ";
517
518 *yield = '4'; /* Default setting is to give a temporary error */
519
520 /* Handle response timeout */
521
522 if (*errno_value == ETIMEDOUT)
523 {
524 *message = US string_sprintf("SMTP timeout after %s%s",
525 pl, smtp_command);
526 if (transport_count > 0)
527 *message = US string_sprintf("%s (%d bytes written)", *message,
528 transport_count);
529 return FALSE;
530 }
531
532 /* Handle malformed SMTP response */
533
534 if (*errno_value == ERRNO_SMTPFORMAT)
535 {
536 const uschar *malfresp = string_printing(buffer);
537 while (isspace(*malfresp)) malfresp++;
538 *message = *malfresp == 0
539 ? string_sprintf("Malformed SMTP reply (an empty line) "
540 "in response to %s%s", pl, smtp_command)
541 : string_sprintf("Malformed SMTP reply in response to %s%s: %s",
542 pl, smtp_command, malfresp);
543 return FALSE;
544 }
545
546 /* Handle a failed filter process error; can't send QUIT as we mustn't
547 end the DATA. */
548
549 if (*errno_value == ERRNO_FILTER_FAIL)
550 {
551 *message = US string_sprintf("transport filter process failed (%d)%s",
552 more_errno,
553 (more_errno == EX_EXECFAILED)? ": unable to execute command" : "");
554 return FALSE;
555 }
556
557 /* Handle a failed add_headers expansion; can't send QUIT as we mustn't
558 end the DATA. */
559
560 if (*errno_value == ERRNO_CHHEADER_FAIL)
561 {
562 *message =
563 US string_sprintf("failed to expand headers_add or headers_remove: %s",
564 expand_string_message);
565 return FALSE;
566 }
567
568 /* Handle failure to write a complete data block */
569
570 if (*errno_value == ERRNO_WRITEINCOMPLETE)
571 {
572 *message = US string_sprintf("failed to write a data block");
573 return FALSE;
574 }
575
576 #ifdef SUPPORT_I18N
577 /* Handle lack of advertised SMTPUTF8, for international message */
578 if (*errno_value == ERRNO_UTF8_FWD)
579 {
580 *message = US string_sprintf("utf8 support required but not offered for forwarding");
581 DEBUG(D_deliver|D_transport) debug_printf("%s\n", *message);
582 return TRUE;
583 }
584 #endif
585
586 /* Handle error responses from the remote mailer. */
587
588 if (buffer[0] != 0)
589 {
590 const uschar *s = string_printing(buffer);
591 *message = US string_sprintf("SMTP error from remote mail server after %s%s: "
592 "%s", pl, smtp_command, s);
593 *pass_message = TRUE;
594 *yield = buffer[0];
595 return TRUE;
596 }
597
598 /* No data was read. If there is no errno, this must be the EOF (i.e.
599 connection closed) case, which causes deferral. An explicit connection reset
600 error has the same effect. Otherwise, put the host's identity in the message,
601 leaving the errno value to be interpreted as well. In all cases, we have to
602 assume the connection is now dead. */
603
604 if (*errno_value == 0 || *errno_value == ECONNRESET)
605 {
606 *errno_value = ERRNO_SMTPCLOSED;
607 *message = US string_sprintf("Remote host closed connection "
608 "in response to %s%s", pl, smtp_command);
609 }
610 else *message = US string_sprintf("%s [%s]", host->name, host->address);
611
612 return FALSE;
613 }
614
615
616
617 /*************************************************
618 * Write error message to logs *
619 *************************************************/
620
621 /* This writes to the main log and to the message log.
622
623 Arguments:
624 addr the address item containing error information
625 host the current host
626
627 Returns: nothing
628 */
629
630 static void
631 write_logs(address_item *addr, host_item *host)
632 {
633 uschar * message = string_sprintf("H=%s [%s]", host->name, host->address);
634
635 if (LOGGING(outgoing_port))
636 message = string_sprintf("%s:%d", message,
637 host->port == PORT_NONE ? 25 : host->port);
638 if (addr->message)
639 {
640 message = string_sprintf("%s: %s", message, addr->message);
641 if (addr->basic_errno > 0)
642 message = string_sprintf("%s: %s", message, strerror(addr->basic_errno));
643 log_write(0, LOG_MAIN, "%s", message);
644 deliver_msglog("%s %s\n", tod_stamp(tod_log), message);
645 }
646 else
647 {
648 const uschar * s = exim_errstr(addr->basic_errno);
649 log_write(0, LOG_MAIN, "%s %s", message, s);
650 deliver_msglog("%s %s %s\n", tod_stamp(tod_log), message, s);
651 }
652 }
653
654 static void
655 msglog_line(host_item * host, uschar * message)
656 {
657 deliver_msglog("%s H=%s [%s] %s\n", tod_stamp(tod_log),
658 host->name, host->address, message);
659 }
660
661
662
663 #ifndef DISABLE_EVENT
664 /*************************************************
665 * Post-defer action *
666 *************************************************/
667
668 /* This expands an arbitrary per-transport string.
669 It might, for example, be used to write to the database log.
670
671 Arguments:
672 addr the address item containing error information
673 host the current host
674
675 Returns: nothing
676 */
677
678 static void
679 deferred_event_raise(address_item *addr, host_item *host)
680 {
681 uschar * action = addr->transport->event_action;
682 const uschar * save_domain;
683 uschar * save_local;
684
685 if (!action)
686 return;
687
688 save_domain = deliver_domain;
689 save_local = deliver_localpart;
690
691 /*XXX would ip & port already be set up? */
692 deliver_host_address = string_copy(host->address);
693 deliver_host_port = host->port == PORT_NONE ? 25 : host->port;
694 event_defer_errno = addr->basic_errno;
695
696 router_name = addr->router->name;
697 transport_name = addr->transport->name;
698 deliver_domain = addr->domain;
699 deliver_localpart = addr->local_part;
700
701 (void) event_raise(action, US"msg:host:defer",
702 addr->message
703 ? addr->basic_errno > 0
704 ? string_sprintf("%s: %s", addr->message, strerror(addr->basic_errno))
705 : string_copy(addr->message)
706 : addr->basic_errno > 0
707 ? string_copy(US strerror(addr->basic_errno))
708 : NULL);
709
710 deliver_localpart = save_local;
711 deliver_domain = save_domain;
712 router_name = transport_name = NULL;
713 }
714 #endif
715
716 /*************************************************
717 * Synchronize SMTP responses *
718 *************************************************/
719
720 /* This function is called from smtp_deliver() to receive SMTP responses from
721 the server, and match them up with the commands to which they relate. When
722 PIPELINING is not in use, this function is called after every command, and is
723 therefore somewhat over-engineered, but it is simpler to use a single scheme
724 that works both with and without PIPELINING instead of having two separate sets
725 of code.
726
727 The set of commands that are buffered up with pipelining may start with MAIL
728 and may end with DATA; in between are RCPT commands that correspond to the
729 addresses whose status is PENDING_DEFER. All other commands (STARTTLS, AUTH,
730 etc.) are never buffered.
731
732 Errors after MAIL or DATA abort the whole process leaving the response in the
733 buffer. After MAIL, pending responses are flushed, and the original command is
734 re-instated in big_buffer for error messages. For RCPT commands, the remote is
735 permitted to reject some recipient addresses while accepting others. However
736 certain errors clearly abort the whole process. Set the value in
737 transport_return to PENDING_OK if the address is accepted. If there is a
738 subsequent general error, it will get reset accordingly. If not, it will get
739 converted to OK at the end.
740
741 Arguments:
742 addrlist the complete address list
743 include_affixes TRUE if affixes include in RCPT
744 sync_addr ptr to the ptr of the one to start scanning at (updated)
745 host the host we are connected to
746 count the number of responses to read
747 address_retry_
748 include_sender true if 4xx retry is to include the sender it its key
749 pending_MAIL true if the first response is for MAIL
750 pending_DATA 0 if last command sent was not DATA
751 +1 if previously had a good recipient
752 -1 if not previously had a good recipient
753 inblock incoming SMTP block
754 timeout timeout value
755 buffer buffer for reading response
756 buffsize size of buffer
757
758 Returns: 3 if at least one address had 2xx and one had 5xx
759 2 if at least one address had 5xx but none had 2xx
760 1 if at least one host had a 2xx response, but none had 5xx
761 0 no address had 2xx or 5xx but no errors (all 4xx, or just DATA)
762 -1 timeout while reading RCPT response
763 -2 I/O or other non-response error for RCPT
764 -3 DATA or MAIL failed - errno and buffer set
765 */
766
767 static int
768 sync_responses(address_item *addrlist, BOOL include_affixes,
769 address_item **sync_addr, host_item *host, int count,
770 BOOL address_retry_include_sender, BOOL pending_MAIL,
771 int pending_DATA, smtp_inblock *inblock, int timeout, uschar *buffer,
772 int buffsize)
773 {
774 address_item *addr = *sync_addr;
775 int yield = 0;
776
777 /* Handle the response for a MAIL command. On error, reinstate the original
778 command in big_buffer for error message use, and flush any further pending
779 responses before returning, except after I/O errors and timeouts. */
780
781 if (pending_MAIL)
782 {
783 count--;
784 if (!smtp_read_response(inblock, buffer, buffsize, '2', timeout))
785 {
786 Ustrcpy(big_buffer, mail_command); /* Fits, because it came from there! */
787 if (errno == 0 && buffer[0] != 0)
788 {
789 uschar flushbuffer[4096];
790 int save_errno = 0;
791 if (buffer[0] == '4')
792 {
793 save_errno = ERRNO_MAIL4XX;
794 addr->more_errno |= ((buffer[1] - '0')*10 + buffer[2] - '0') << 8;
795 }
796 while (count-- > 0)
797 {
798 if (!smtp_read_response(inblock, flushbuffer, sizeof(flushbuffer),
799 '2', timeout)
800 && (errno != 0 || flushbuffer[0] == 0))
801 break;
802 }
803 errno = save_errno;
804 }
805
806 if (pending_DATA) count--; /* Number of RCPT responses to come */
807 while (count-- > 0) /* Mark any pending addrs with the host used */
808 {
809 while (addr->transport_return != PENDING_DEFER) addr = addr->next;
810 addr->host_used = host;
811 addr = addr->next;
812 }
813 return -3;
814 }
815 }
816
817 if (pending_DATA) count--; /* Number of RCPT responses to come */
818
819 /* Read and handle the required number of RCPT responses, matching each one up
820 with an address by scanning for the next address whose status is PENDING_DEFER.
821 */
822
823 while (count-- > 0)
824 {
825 while (addr->transport_return != PENDING_DEFER) addr = addr->next;
826
827 /* The address was accepted */
828 addr->host_used = host;
829
830 if (smtp_read_response(inblock, buffer, buffsize, '2', timeout))
831 {
832 yield |= 1;
833 addr->transport_return = PENDING_OK;
834
835 /* If af_dr_retry_exists is set, there was a routing delay on this address;
836 ensure that any address-specific retry record is expunged. We do this both
837 for the basic key and for the version that also includes the sender. */
838
839 if (testflag(addr, af_dr_retry_exists))
840 {
841 uschar *altkey = string_sprintf("%s:<%s>", addr->address_retry_key,
842 sender_address);
843 retry_add_item(addr, altkey, rf_delete);
844 retry_add_item(addr, addr->address_retry_key, rf_delete);
845 }
846 }
847
848 /* Timeout while reading the response */
849
850 else if (errno == ETIMEDOUT)
851 {
852 uschar *message = string_sprintf("SMTP timeout after RCPT TO:<%s>",
853 transport_rcpt_address(addr, include_affixes));
854 set_errno_nohost(addrlist, ETIMEDOUT, message, DEFER, FALSE);
855 retry_add_item(addr, addr->address_retry_key, 0);
856 update_waiting = FALSE;
857 return -1;
858 }
859
860 /* Handle other errors in obtaining an SMTP response by returning -1. This
861 will cause all the addresses to be deferred. Restore the SMTP command in
862 big_buffer for which we are checking the response, so the error message
863 makes sense. */
864
865 else if (errno != 0 || buffer[0] == 0)
866 {
867 string_format(big_buffer, big_buffer_size, "RCPT TO:<%s>",
868 transport_rcpt_address(addr, include_affixes));
869 return -2;
870 }
871
872 /* Handle SMTP permanent and temporary response codes. */
873
874 else
875 {
876 addr->message =
877 string_sprintf("SMTP error from remote mail server after RCPT TO:<%s>: "
878 "%s", transport_rcpt_address(addr, include_affixes),
879 string_printing(buffer));
880 setflag(addr, af_pass_message);
881 msglog_line(host, addr->message);
882
883 /* The response was 5xx */
884
885 if (buffer[0] == '5')
886 {
887 addr->transport_return = FAIL;
888 yield |= 2;
889 }
890
891 /* The response was 4xx */
892
893 else
894 {
895 addr->transport_return = DEFER;
896 addr->basic_errno = ERRNO_RCPT4XX;
897 addr->more_errno |= ((buffer[1] - '0')*10 + buffer[2] - '0') << 8;
898
899 #ifndef DISABLE_EVENT
900 event_defer_errno = addr->more_errno;
901 msg_event_raise(US"msg:rcpt:host:defer", addr);
902 #endif
903
904 /* Log temporary errors if there are more hosts to be tried.
905 If not, log this last one in the == line. */
906
907 if (host->next)
908 log_write(0, LOG_MAIN, "H=%s [%s]: %s", host->name, host->address, addr->message);
909
910 #ifndef DISABLE_EVENT
911 else
912 msg_event_raise(US"msg:rcpt:defer", addr);
913 #endif
914
915 /* Do not put this message on the list of those waiting for specific
916 hosts, as otherwise it is likely to be tried too often. */
917
918 update_waiting = FALSE;
919
920 /* Add a retry item for the address so that it doesn't get tried again
921 too soon. If address_retry_include_sender is true, add the sender address
922 to the retry key. */
923
924 if (address_retry_include_sender)
925 {
926 uschar *altkey = string_sprintf("%s:<%s>", addr->address_retry_key,
927 sender_address);
928 retry_add_item(addr, altkey, 0);
929 }
930 else retry_add_item(addr, addr->address_retry_key, 0);
931 }
932 }
933 } /* Loop for next RCPT response */
934
935 /* Update where to start at for the next block of responses, unless we
936 have already handled all the addresses. */
937
938 if (addr != NULL) *sync_addr = addr->next;
939
940 /* Handle a response to DATA. If we have not had any good recipients, either
941 previously or in this block, the response is ignored. */
942
943 if (pending_DATA != 0 &&
944 !smtp_read_response(inblock, buffer, buffsize, '3', timeout))
945 {
946 int code;
947 uschar *msg;
948 BOOL pass_message;
949 if (pending_DATA > 0 || (yield & 1) != 0)
950 {
951 if (errno == 0 && buffer[0] == '4')
952 {
953 errno = ERRNO_DATA4XX;
954 addrlist->more_errno |= ((buffer[1] - '0')*10 + buffer[2] - '0') << 8;
955 }
956 return -3;
957 }
958 (void)check_response(host, &errno, 0, buffer, &code, &msg, &pass_message);
959 DEBUG(D_transport) debug_printf("%s\nerror for DATA ignored: pipelining "
960 "is in use and there were no good recipients\n", msg);
961 }
962
963 /* All responses read and handled; MAIL (if present) received 2xx and DATA (if
964 present) received 3xx. If any RCPTs were handled and yielded anything other
965 than 4xx, yield will be set non-zero. */
966
967 return yield;
968 }
969
970
971
972 /* Do the client side of smtp-level authentication */
973 /*
974 Arguments:
975 buffer EHLO response from server (gets overwritten)
976 addrlist chain of potential addresses to deliver
977 host host to deliver to
978 ob transport options
979 ibp, obp comms channel control blocks
980
981 Returns:
982 OK Success, or failed (but not required): global "smtp_authenticated" set
983 DEFER Failed authentication (and was required)
984 ERROR Internal problem
985
986 FAIL_SEND Failed communications - transmit
987 FAIL - response
988 */
989
990 int
991 smtp_auth(uschar *buffer, unsigned bufsize, address_item *addrlist, host_item *host,
992 smtp_transport_options_block *ob, BOOL is_esmtp,
993 smtp_inblock *ibp, smtp_outblock *obp)
994 {
995 int require_auth;
996 uschar *fail_reason = US"server did not advertise AUTH support";
997
998 smtp_authenticated = FALSE;
999 client_authenticator = client_authenticated_id = client_authenticated_sender = NULL;
1000 require_auth = verify_check_given_host(&ob->hosts_require_auth, host);
1001
1002 if (is_esmtp && !regex_AUTH) regex_AUTH =
1003 regex_must_compile(US"\\n250[\\s\\-]AUTH\\s+([\\-\\w\\s]+)(?:\\n|$)",
1004 FALSE, TRUE);
1005
1006 if (is_esmtp && regex_match_and_setup(regex_AUTH, buffer, 0, -1))
1007 {
1008 uschar *names = string_copyn(expand_nstring[1], expand_nlength[1]);
1009 expand_nmax = -1; /* reset */
1010
1011 /* Must not do this check until after we have saved the result of the
1012 regex match above. */
1013
1014 if (require_auth == OK ||
1015 verify_check_given_host(&ob->hosts_try_auth, host) == OK)
1016 {
1017 auth_instance *au;
1018 fail_reason = US"no common mechanisms were found";
1019
1020 DEBUG(D_transport) debug_printf("scanning authentication mechanisms\n");
1021
1022 /* Scan the configured authenticators looking for one which is configured
1023 for use as a client, which is not suppressed by client_condition, and
1024 whose name matches an authentication mechanism supported by the server.
1025 If one is found, attempt to authenticate by calling its client function.
1026 */
1027
1028 for (au = auths; !smtp_authenticated && au != NULL; au = au->next)
1029 {
1030 uschar *p = names;
1031 if (!au->client ||
1032 (au->client_condition != NULL &&
1033 !expand_check_condition(au->client_condition, au->name,
1034 US"client authenticator")))
1035 {
1036 DEBUG(D_transport) debug_printf("skipping %s authenticator: %s\n",
1037 au->name,
1038 (au->client)? "client_condition is false" :
1039 "not configured as a client");
1040 continue;
1041 }
1042
1043 /* Loop to scan supported server mechanisms */
1044
1045 while (*p != 0)
1046 {
1047 int rc;
1048 int len = Ustrlen(au->public_name);
1049 while (isspace(*p)) p++;
1050
1051 if (strncmpic(au->public_name, p, len) != 0 ||
1052 (p[len] != 0 && !isspace(p[len])))
1053 {
1054 while (*p != 0 && !isspace(*p)) p++;
1055 continue;
1056 }
1057
1058 /* Found data for a listed mechanism. Call its client entry. Set
1059 a flag in the outblock so that data is overwritten after sending so
1060 that reflections don't show it. */
1061
1062 fail_reason = US"authentication attempt(s) failed";
1063 obp->authenticating = TRUE;
1064 rc = (au->info->clientcode)(au, ibp, obp,
1065 ob->command_timeout, buffer, bufsize);
1066 obp->authenticating = FALSE;
1067 DEBUG(D_transport) debug_printf("%s authenticator yielded %d\n",
1068 au->name, rc);
1069
1070 /* A temporary authentication failure must hold up delivery to
1071 this host. After a permanent authentication failure, we carry on
1072 to try other authentication methods. If all fail hard, try to
1073 deliver the message unauthenticated unless require_auth was set. */
1074
1075 switch(rc)
1076 {
1077 case OK:
1078 smtp_authenticated = TRUE; /* stops the outer loop */
1079 client_authenticator = au->name;
1080 if (au->set_client_id != NULL)
1081 client_authenticated_id = expand_string(au->set_client_id);
1082 break;
1083
1084 /* Failure after writing a command */
1085
1086 case FAIL_SEND:
1087 return FAIL_SEND;
1088
1089 /* Failure after reading a response */
1090
1091 case FAIL:
1092 if (errno != 0 || buffer[0] != '5') return FAIL;
1093 log_write(0, LOG_MAIN, "%s authenticator failed H=%s [%s] %s",
1094 au->name, host->name, host->address, buffer);
1095 break;
1096
1097 /* Failure by some other means. In effect, the authenticator
1098 decided it wasn't prepared to handle this case. Typically this
1099 is the result of "fail" in an expansion string. Do we need to
1100 log anything here? Feb 2006: a message is now put in the buffer
1101 if logging is required. */
1102
1103 case CANCELLED:
1104 if (*buffer != 0)
1105 log_write(0, LOG_MAIN, "%s authenticator cancelled "
1106 "authentication H=%s [%s] %s", au->name, host->name,
1107 host->address, buffer);
1108 break;
1109
1110 /* Internal problem, message in buffer. */
1111
1112 case ERROR:
1113 set_errno_nohost(addrlist, ERRNO_AUTHPROB, string_copy(buffer),
1114 DEFER, FALSE);
1115 return ERROR;
1116 }
1117
1118 break; /* If not authenticated, try next authenticator */
1119 } /* Loop for scanning supported server mechanisms */
1120 } /* Loop for further authenticators */
1121 }
1122 }
1123
1124 /* If we haven't authenticated, but are required to, give up. */
1125
1126 if (require_auth == OK && !smtp_authenticated)
1127 {
1128 set_errno_nohost(addrlist, ERRNO_AUTHFAIL,
1129 string_sprintf("authentication required but %s", fail_reason), DEFER,
1130 FALSE);
1131 return DEFER;
1132 }
1133
1134 return OK;
1135 }
1136
1137
1138 /* Construct AUTH appendix string for MAIL TO */
1139 /*
1140 Arguments
1141 buffer to build string
1142 addrlist chain of potential addresses to deliver
1143 ob transport options
1144
1145 Globals smtp_authenticated
1146 client_authenticated_sender
1147 Return True on error, otherwise buffer has (possibly empty) terminated string
1148 */
1149
1150 BOOL
1151 smtp_mail_auth_str(uschar *buffer, unsigned bufsize, address_item *addrlist,
1152 smtp_transport_options_block *ob)
1153 {
1154 uschar *local_authenticated_sender = authenticated_sender;
1155
1156 #ifdef notdef
1157 debug_printf("smtp_mail_auth_str: as<%s> os<%s> SA<%s>\n", authenticated_sender, ob->authenticated_sender, smtp_authenticated?"Y":"N");
1158 #endif
1159
1160 if (ob->authenticated_sender != NULL)
1161 {
1162 uschar *new = expand_string(ob->authenticated_sender);
1163 if (new == NULL)
1164 {
1165 if (!expand_string_forcedfail)
1166 {
1167 uschar *message = string_sprintf("failed to expand "
1168 "authenticated_sender: %s", expand_string_message);
1169 set_errno_nohost(addrlist, ERRNO_EXPANDFAIL, message, DEFER, FALSE);
1170 return TRUE;
1171 }
1172 }
1173 else if (new[0] != 0) local_authenticated_sender = new;
1174 }
1175
1176 /* Add the authenticated sender address if present */
1177
1178 if ((smtp_authenticated || ob->authenticated_sender_force) &&
1179 local_authenticated_sender != NULL)
1180 {
1181 string_format(buffer, bufsize, " AUTH=%s",
1182 auth_xtextencode(local_authenticated_sender,
1183 Ustrlen(local_authenticated_sender)));
1184 client_authenticated_sender = string_copy(local_authenticated_sender);
1185 }
1186 else
1187 *buffer= 0;
1188
1189 return FALSE;
1190 }
1191
1192
1193
1194 #ifdef EXPERIMENTAL_DANE
1195 /* Lookup TLSA record for host/port.
1196 Return: OK success with dnssec; DANE mode
1197 DEFER Do not use this host now, may retry later
1198 FAIL_FORCED No TLSA record; DANE not usable
1199 FAIL Do not use this connection
1200 */
1201
1202 int
1203 tlsa_lookup(const host_item * host, dns_answer * dnsa, BOOL dane_required)
1204 {
1205 /* move this out to host.c given the similarity to dns_lookup() ? */
1206 uschar buffer[300];
1207 const uschar * fullname = buffer;
1208
1209 /* TLSA lookup string */
1210 (void)sprintf(CS buffer, "_%d._tcp.%.256s", host->port, host->name);
1211
1212 switch (dns_lookup(dnsa, buffer, T_TLSA, &fullname))
1213 {
1214 case DNS_SUCCEED:
1215 if (!dns_is_secure(dnsa))
1216 {
1217 log_write(0, LOG_MAIN, "DANE error: TLSA lookup not DNSSEC");
1218 return DEFER;
1219 }
1220 return OK;
1221
1222 case DNS_AGAIN:
1223 return DEFER; /* just defer this TLS'd conn */
1224
1225 case DNS_NOMATCH:
1226 return dane_required ? FAIL : FAIL_FORCED;
1227
1228 default:
1229 case DNS_FAIL:
1230 return dane_required ? FAIL : DEFER;
1231 }
1232 }
1233 #endif
1234
1235
1236
1237 typedef struct smtp_compare_s
1238 {
1239 uschar *current_sender_address;
1240 struct transport_instance *tblock;
1241 } smtp_compare_t;
1242
1243 /*
1244 Create a unique string that identifies this message, it is based on
1245 sender_address, helo_data and tls_certificate if enabled. */
1246
1247 static uschar *
1248 smtp_local_identity(uschar * sender, struct transport_instance * tblock)
1249 {
1250 address_item * addr1;
1251 uschar * if1 = US"";
1252 uschar * helo1 = US"";
1253 #ifdef SUPPORT_TLS
1254 uschar * tlsc1 = US"";
1255 #endif
1256 uschar * save_sender_address = sender_address;
1257 uschar * local_identity = NULL;
1258 smtp_transport_options_block * ob =
1259 (smtp_transport_options_block *)tblock->options_block;
1260
1261 sender_address = sender;
1262
1263 addr1 = deliver_make_addr (sender, TRUE);
1264 deliver_set_expansions(addr1);
1265
1266 if (ob->interface)
1267 if1 = expand_string(ob->interface);
1268
1269 if (ob->helo_data)
1270 helo1 = expand_string(ob->helo_data);
1271
1272 #ifdef SUPPORT_TLS
1273 if (ob->tls_certificate)
1274 tlsc1 = expand_string(ob->tls_certificate);
1275 local_identity = string_sprintf ("%s^%s^%s", if1, helo1, tlsc1);
1276 #else
1277 local_identity = string_sprintf ("%s^%s", if1, helo1);
1278 #endif
1279
1280 deliver_set_expansions(NULL);
1281 sender_address = save_sender_address;
1282
1283 return local_identity;
1284 }
1285
1286
1287
1288 /* This routine is a callback that is called from transport_check_waiting.
1289 This function will evaluate the incoming message versus the previous
1290 message. If the incoming message is using a different local identity then
1291 we will veto this new message. */
1292
1293 static BOOL
1294 smtp_are_same_identities(uschar * message_id, smtp_compare_t * s_compare)
1295 {
1296 uschar * message_local_identity,
1297 * current_local_identity,
1298 * new_sender_address;
1299
1300 current_local_identity =
1301 smtp_local_identity(s_compare->current_sender_address, s_compare->tblock);
1302
1303 if (!(new_sender_address = deliver_get_sender_address(message_id)))
1304 return 0;
1305
1306 message_local_identity =
1307 smtp_local_identity(new_sender_address, s_compare->tblock);
1308
1309 return Ustrcmp(current_local_identity, message_local_identity) == 0;
1310 }
1311
1312
1313
1314 uschar
1315 ehlo_response(uschar * buf, size_t bsize, uschar checks)
1316 {
1317 #ifdef SUPPORT_TLS
1318 if (checks & PEER_OFFERED_TLS)
1319 if (pcre_exec(regex_STARTTLS, NULL, CS buf, bsize, 0, PCRE_EOPT, NULL, 0) < 0)
1320 checks &= ~PEER_OFFERED_TLS;
1321 #endif
1322
1323 if ( checks & PEER_OFFERED_IGNQ
1324 && pcre_exec(regex_IGNOREQUOTA, NULL, CS buf, bsize, 0,
1325 PCRE_EOPT, NULL, 0) < 0)
1326 checks &= ~PEER_OFFERED_IGNQ;
1327
1328 #ifndef DISABLE_PRDR
1329 if ( checks & PEER_OFFERED_PRDR
1330 && pcre_exec(regex_PRDR, NULL, CS buf, bsize, 0, PCRE_EOPT, NULL, 0) < 0)
1331 checks &= ~PEER_OFFERED_PRDR;
1332 #endif
1333
1334 #ifdef SUPPORT_I18N
1335 if ( checks & PEER_OFFERED_UTF8
1336 && pcre_exec(regex_UTF8, NULL, CS buf, bsize, 0, PCRE_EOPT, NULL, 0) < 0)
1337 checks &= ~PEER_OFFERED_UTF8;
1338 #endif
1339
1340 if ( checks & PEER_OFFERED_DSN
1341 && pcre_exec(regex_DSN, NULL, CS buf, bsize, 0, PCRE_EOPT, NULL, 0) < 0)
1342 checks &= ~PEER_OFFERED_DSN;
1343
1344 if ( checks & PEER_OFFERED_PIPE
1345 && pcre_exec(regex_PIPELINING, NULL, CS buf, bsize, 0,
1346 PCRE_EOPT, NULL, 0) < 0)
1347 checks &= ~PEER_OFFERED_PIPE;
1348
1349 if ( checks & PEER_OFFERED_SIZE
1350 && pcre_exec(regex_SIZE, NULL, CS buf, bsize, 0, PCRE_EOPT, NULL, 0) < 0)
1351 checks &= ~PEER_OFFERED_SIZE;
1352
1353 return checks;
1354 }
1355
1356
1357 /*************************************************
1358 * Deliver address list to given host *
1359 *************************************************/
1360
1361 /* If continue_hostname is not null, we get here only when continuing to
1362 deliver down an existing channel. The channel was passed as the standard
1363 input. TLS is never active on a passed channel; the previous process always
1364 closes it down before passing the connection on.
1365
1366 Otherwise, we have to make a connection to the remote host, and do the
1367 initial protocol exchange.
1368
1369 When running as an MUA wrapper, if the sender or any recipient is rejected,
1370 temporarily or permanently, we force failure for all recipients.
1371
1372 Arguments:
1373 addrlist chain of potential addresses to deliver; only those whose
1374 transport_return field is set to PENDING_DEFER are currently
1375 being processed; others should be skipped - they have either
1376 been delivered to an earlier host or IP address, or been
1377 failed by one of them.
1378 host host to deliver to
1379 host_af AF_INET or AF_INET6
1380 port default TCP/IP port to use, in host byte order
1381 interface interface to bind to, or NULL
1382 tblock transport instance block
1383 message_defer set TRUE if yield is OK, but all addresses were deferred
1384 because of a non-recipient, non-host failure, that is, a
1385 4xx response to MAIL FROM, DATA, or ".". This is a defer
1386 that is specific to the message.
1387 suppress_tls if TRUE, don't attempt a TLS connection - this is set for
1388 a second attempt after TLS initialization fails
1389
1390 Returns: OK - the connection was made and the delivery attempted;
1391 the result for each address is in its data block.
1392 DEFER - the connection could not be made, or something failed
1393 while setting up the SMTP session, or there was a
1394 non-message-specific error, such as a timeout.
1395 ERROR - a filter command is specified for this transport,
1396 and there was a problem setting it up; OR helo_data
1397 or add_headers or authenticated_sender is specified
1398 for this transport, and the string failed to expand
1399 */
1400
1401 static int
1402 smtp_deliver(address_item *addrlist, host_item *host, int host_af, int port,
1403 uschar *interface, transport_instance *tblock,
1404 BOOL *message_defer, BOOL suppress_tls)
1405 {
1406 address_item *addr;
1407 address_item *sync_addr;
1408 address_item *first_addr = addrlist;
1409 int yield = OK;
1410 int address_count;
1411 int save_errno;
1412 int rc;
1413 time_t start_delivery_time = time(NULL);
1414 smtp_transport_options_block *ob =
1415 (smtp_transport_options_block *)(tblock->options_block);
1416 BOOL lmtp = strcmpic(ob->protocol, US"lmtp") == 0;
1417 BOOL smtps = strcmpic(ob->protocol, US"smtps") == 0;
1418 BOOL ok = FALSE;
1419 BOOL send_rset = TRUE;
1420 BOOL send_quit = TRUE;
1421 BOOL setting_up = TRUE;
1422 BOOL completed_address = FALSE;
1423 BOOL esmtp = TRUE;
1424 BOOL pending_MAIL;
1425 BOOL pass_message = FALSE;
1426 uschar peer_offered = 0; /*XXX should this be handed on cf. tls_offered, smtp_use_dsn ? */
1427 #ifndef DISABLE_PRDR
1428 BOOL prdr_active;
1429 #endif
1430 #ifdef SUPPORT_I18N
1431 BOOL utf8_needed = FALSE;
1432 #endif
1433 BOOL dsn_all_lasthop = TRUE;
1434 #if defined(SUPPORT_TLS) && defined(EXPERIMENTAL_DANE)
1435 BOOL dane = FALSE;
1436 BOOL dane_required = verify_check_given_host(&ob->hosts_require_dane, host) == OK;
1437 dns_answer tlsa_dnsa;
1438 #endif
1439 smtp_inblock inblock;
1440 smtp_outblock outblock;
1441 int max_rcpt = tblock->max_addresses;
1442 uschar *igquotstr = US"";
1443
1444 #ifdef EXPERIMENTAL_DSN_INFO
1445 uschar *smtp_greeting = NULL;
1446 uschar *helo_response = NULL;
1447 #endif
1448 uschar *helo_data = NULL;
1449
1450 uschar *message = NULL;
1451 uschar new_message_id[MESSAGE_ID_LENGTH + 1];
1452 uschar *p;
1453 uschar buffer[4096];
1454 uschar inbuffer[4096];
1455 uschar outbuffer[4096];
1456
1457 suppress_tls = suppress_tls; /* stop compiler warning when no TLS support */
1458
1459 *message_defer = FALSE;
1460 smtp_command = US"initial connection";
1461 if (max_rcpt == 0) max_rcpt = 999999;
1462
1463 /* Set up the buffer for reading SMTP response packets. */
1464
1465 inblock.buffer = inbuffer;
1466 inblock.buffersize = sizeof(inbuffer);
1467 inblock.ptr = inbuffer;
1468 inblock.ptrend = inbuffer;
1469
1470 /* Set up the buffer for holding SMTP commands while pipelining */
1471
1472 outblock.buffer = outbuffer;
1473 outblock.buffersize = sizeof(outbuffer);
1474 outblock.ptr = outbuffer;
1475 outblock.cmd_count = 0;
1476 outblock.authenticating = FALSE;
1477
1478 /* Reset the parameters of a TLS session. */
1479
1480 tls_out.bits = 0;
1481 tls_out.cipher = NULL; /* the one we may use for this transport */
1482 tls_out.ourcert = NULL;
1483 tls_out.peercert = NULL;
1484 tls_out.peerdn = NULL;
1485 #if defined(SUPPORT_TLS) && !defined(USE_GNUTLS)
1486 tls_out.sni = NULL;
1487 #endif
1488 tls_out.ocsp = OCSP_NOT_REQ;
1489
1490 /* Flip the legacy TLS-related variables over to the outbound set in case
1491 they're used in the context of the transport. Don't bother resetting
1492 afterward as we're in a subprocess. */
1493
1494 tls_modify_variables(&tls_out);
1495
1496 #ifndef SUPPORT_TLS
1497 if (smtps)
1498 {
1499 set_errno_nohost(addrlist, ERRNO_TLSFAILURE, US"TLS support not available",
1500 DEFER, FALSE);
1501 return ERROR;
1502 }
1503 #endif
1504
1505 /* Make a connection to the host if this isn't a continued delivery, and handle
1506 the initial interaction and HELO/EHLO/LHLO. Connect timeout errors are handled
1507 specially so they can be identified for retries. */
1508
1509 if (continue_hostname == NULL)
1510 {
1511 /* This puts port into host->port */
1512 inblock.sock = outblock.sock =
1513 smtp_connect(host, host_af, port, interface, ob->connect_timeout, tblock);
1514
1515 if (inblock.sock < 0)
1516 {
1517 set_errno_nohost(addrlist, (errno == ETIMEDOUT)? ERRNO_CONNECTTIMEOUT : errno,
1518 NULL, DEFER, FALSE);
1519 return DEFER;
1520 }
1521
1522 #if defined(SUPPORT_TLS) && defined(EXPERIMENTAL_DANE)
1523 {
1524 tls_out.dane_verified = FALSE;
1525 tls_out.tlsa_usage = 0;
1526
1527 if (host->dnssec == DS_YES)
1528 {
1529 if( dane_required
1530 || verify_check_given_host(&ob->hosts_try_dane, host) == OK
1531 )
1532 switch (rc = tlsa_lookup(host, &tlsa_dnsa, dane_required))
1533 {
1534 case OK: dane = TRUE; break;
1535 case FAIL_FORCED: break;
1536 default: set_errno_nohost(addrlist, ERRNO_DNSDEFER,
1537 string_sprintf("DANE error: tlsa lookup %s",
1538 rc == DEFER ? "DEFER" : "FAIL"),
1539 rc, FALSE);
1540 return rc;
1541 }
1542 }
1543 else if (dane_required)
1544 {
1545 set_errno_nohost(addrlist, ERRNO_DNSDEFER,
1546 string_sprintf("DANE error: %s lookup not DNSSEC", host->name),
1547 FAIL, FALSE);
1548 return FAIL;
1549 }
1550
1551 if (dane)
1552 ob->tls_tempfail_tryclear = FALSE;
1553 }
1554 #endif /*DANE*/
1555
1556 /* Expand the greeting message while waiting for the initial response. (Makes
1557 sense if helo_data contains ${lookup dnsdb ...} stuff). The expansion is
1558 delayed till here so that $sending_interface and $sending_port are set. */
1559
1560 helo_data = expand_string(ob->helo_data);
1561 #ifdef SUPPORT_I18N
1562 if (helo_data)
1563 {
1564 uschar * errstr = NULL;
1565 if ((helo_data = string_domain_utf8_to_alabel(helo_data, &errstr)), errstr)
1566 {
1567 errstr = string_sprintf("failed to expand helo_data: %s", errstr);
1568 set_errno_nohost(addrlist, ERRNO_EXPANDFAIL, errstr, DEFER, FALSE);
1569 yield = DEFER;
1570 goto SEND_QUIT;
1571 }
1572 }
1573 #endif
1574
1575 /* The first thing is to wait for an initial OK response. The dreaded "goto"
1576 is nevertheless a reasonably clean way of programming this kind of logic,
1577 where you want to escape on any error. */
1578
1579 if (!smtps)
1580 {
1581 BOOL good_response = smtp_read_response(&inblock, buffer, sizeof(buffer),
1582 '2', ob->command_timeout);
1583 #ifdef EXPERIMENTAL_DSN_INFO
1584 smtp_greeting = string_copy(buffer);
1585 #endif
1586 if (!good_response) goto RESPONSE_FAILED;
1587
1588 #ifndef DISABLE_EVENT
1589 {
1590 uschar * s;
1591 lookup_dnssec_authenticated = host->dnssec==DS_YES ? US"yes"
1592 : host->dnssec==DS_NO ? US"no" : NULL;
1593 s = event_raise(tblock->event_action, US"smtp:connect", buffer);
1594 if (s)
1595 {
1596 set_errno_nohost(addrlist, ERRNO_EXPANDFAIL,
1597 string_sprintf("deferred by smtp:connect event expansion: %s", s),
1598 DEFER, FALSE);
1599 yield = DEFER;
1600 goto SEND_QUIT;
1601 }
1602 }
1603 #endif
1604
1605 /* Now check if the helo_data expansion went well, and sign off cleanly if
1606 it didn't. */
1607
1608 if (helo_data == NULL)
1609 {
1610 uschar *message = string_sprintf("failed to expand helo_data: %s",
1611 expand_string_message);
1612 set_errno_nohost(addrlist, ERRNO_EXPANDFAIL, message, DEFER, FALSE);
1613 yield = DEFER;
1614 goto SEND_QUIT;
1615 }
1616 }
1617
1618 /** Debugging without sending a message
1619 addrlist->transport_return = DEFER;
1620 goto SEND_QUIT;
1621 **/
1622
1623 /* Errors that occur after this point follow an SMTP command, which is
1624 left in big_buffer by smtp_write_command() for use in error messages. */
1625
1626 smtp_command = big_buffer;
1627
1628 /* Tell the remote who we are...
1629
1630 February 1998: A convention has evolved that ESMTP-speaking MTAs include the
1631 string "ESMTP" in their greeting lines, so make Exim send EHLO if the
1632 greeting is of this form. The assumption was that the far end supports it
1633 properly... but experience shows that there are some that give 5xx responses,
1634 even though the banner includes "ESMTP" (there's a bloody-minded one that
1635 says "ESMTP not spoken here"). Cope with that case.
1636
1637 September 2000: Time has passed, and it seems reasonable now to always send
1638 EHLO at the start. It is also convenient to make the change while installing
1639 the TLS stuff.
1640
1641 July 2003: Joachim Wieland met a broken server that advertises "PIPELINING"
1642 but times out after sending MAIL FROM, RCPT TO and DATA all together. There
1643 would be no way to send out the mails, so there is now a host list
1644 "hosts_avoid_esmtp" that disables ESMTP for special hosts and solves the
1645 PIPELINING problem as well. Maybe it can also be useful to cure other
1646 problems with broken servers.
1647
1648 Exim originally sent "Helo" at this point and ran for nearly a year that way.
1649 Then somebody tried it with a Microsoft mailer... It seems that all other
1650 mailers use upper case for some reason (the RFC is quite clear about case
1651 independence) so, for peace of mind, I gave in. */
1652
1653 esmtp = verify_check_given_host(&ob->hosts_avoid_esmtp, host) != OK;
1654
1655 /* Alas; be careful, since this goto is not an error-out, so conceivably
1656 we might set data between here and the target which we assume to exist
1657 and be usable. I can see this coming back to bite us. */
1658 #ifdef SUPPORT_TLS
1659 if (smtps)
1660 {
1661 tls_offered = TRUE;
1662 suppress_tls = FALSE;
1663 ob->tls_tempfail_tryclear = FALSE;
1664 smtp_command = US"SSL-on-connect";
1665 goto TLS_NEGOTIATE;
1666 }
1667 #endif
1668
1669 if (esmtp)
1670 {
1671 if (smtp_write_command(&outblock, FALSE, "%s %s\r\n",
1672 lmtp? "LHLO" : "EHLO", helo_data) < 0)
1673 goto SEND_FAILED;
1674 if (!smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
1675 ob->command_timeout))
1676 {
1677 if (errno != 0 || buffer[0] == 0 || lmtp)
1678 {
1679 #ifdef EXPERIMENTAL_DSN_INFO
1680 helo_response = string_copy(buffer);
1681 #endif
1682 goto RESPONSE_FAILED;
1683 }
1684 esmtp = FALSE;
1685 }
1686 #ifdef EXPERIMENTAL_DSN_INFO
1687 helo_response = string_copy(buffer);
1688 #endif
1689 }
1690 else
1691 {
1692 DEBUG(D_transport)
1693 debug_printf("not sending EHLO (host matches hosts_avoid_esmtp)\n");
1694 }
1695
1696 if (!esmtp)
1697 {
1698 BOOL good_response;
1699
1700 if (smtp_write_command(&outblock, FALSE, "HELO %s\r\n", helo_data) < 0)
1701 goto SEND_FAILED;
1702 good_response = smtp_read_response(&inblock, buffer, sizeof(buffer),
1703 '2', ob->command_timeout);
1704 #ifdef EXPERIMENTAL_DSN_INFO
1705 helo_response = string_copy(buffer);
1706 #endif
1707 if (!good_response) goto RESPONSE_FAILED;
1708 }
1709
1710 if (esmtp || lmtp)
1711 peer_offered = ehlo_response(buffer, Ustrlen(buffer),
1712 PEER_OFFERED_TLS
1713 | 0 /* IGNQ checked later */
1714 | 0 /* PRDR checked later */
1715 | 0 /* UTF8 checked later */
1716 | 0 /* DSN checked later */
1717 | 0 /* PIPE checked later */
1718 | 0 /* SIZE checked later */
1719 );
1720
1721 /* Set tls_offered if the response to EHLO specifies support for STARTTLS. */
1722
1723 #ifdef SUPPORT_TLS
1724 tls_offered = !!(peer_offered & PEER_OFFERED_TLS);
1725 #endif
1726 }
1727
1728 /* For continuing deliveries down the same channel, the socket is the standard
1729 input, and we don't need to redo EHLO here (but may need to do so for TLS - see
1730 below). Set up the pointer to where subsequent commands will be left, for
1731 error messages. Note that smtp_use_size and smtp_use_pipelining will have been
1732 set from the command line if they were set in the process that passed the
1733 connection on. */
1734
1735 /*XXX continue case needs to propagate DSN_INFO, prob. in deliver.c
1736 as the contine goes via transport_pass_socket() and doublefork and exec.
1737 It does not wait. Unclear how we keep separate host's responses
1738 separate - we could match up by host ip+port as a bodge. */
1739
1740 else
1741 {
1742 inblock.sock = outblock.sock = fileno(stdin);
1743 smtp_command = big_buffer;
1744 host->port = port; /* Record the port that was used */
1745 }
1746
1747 /* If TLS is available on this connection, whether continued or not, attempt to
1748 start up a TLS session, unless the host is in hosts_avoid_tls. If successful,
1749 send another EHLO - the server may give a different answer in secure mode. We
1750 use a separate buffer for reading the response to STARTTLS so that if it is
1751 negative, the original EHLO data is available for subsequent analysis, should
1752 the client not be required to use TLS. If the response is bad, copy the buffer
1753 for error analysis. */
1754
1755 #ifdef SUPPORT_TLS
1756 if ( tls_offered
1757 && !suppress_tls
1758 && verify_check_given_host(&ob->hosts_avoid_tls, host) != OK)
1759 {
1760 uschar buffer2[4096];
1761 if (smtp_write_command(&outblock, FALSE, "STARTTLS\r\n") < 0)
1762 goto SEND_FAILED;
1763
1764 /* If there is an I/O error, transmission of this message is deferred. If
1765 there is a temporary rejection of STARRTLS and tls_tempfail_tryclear is
1766 false, we also defer. However, if there is a temporary rejection of STARTTLS
1767 and tls_tempfail_tryclear is true, or if there is an outright rejection of
1768 STARTTLS, we carry on. This means we will try to send the message in clear,
1769 unless the host is in hosts_require_tls (tested below). */
1770
1771 if (!smtp_read_response(&inblock, buffer2, sizeof(buffer2), '2',
1772 ob->command_timeout))
1773 {
1774 if ( errno != 0
1775 || buffer2[0] == 0
1776 || (buffer2[0] == '4' && !ob->tls_tempfail_tryclear)
1777 )
1778 {
1779 Ustrncpy(buffer, buffer2, sizeof(buffer));
1780 goto RESPONSE_FAILED;
1781 }
1782 }
1783
1784 /* STARTTLS accepted: try to negotiate a TLS session. */
1785
1786 else
1787 TLS_NEGOTIATE:
1788 {
1789 int rc = tls_client_start(inblock.sock, host, addrlist, tblock
1790 # ifdef EXPERIMENTAL_DANE
1791 , dane ? &tlsa_dnsa : NULL
1792 # endif
1793 );
1794
1795 /* TLS negotiation failed; give an error. From outside, this function may
1796 be called again to try in clear on a new connection, if the options permit
1797 it for this host. */
1798
1799 if (rc != OK)
1800 {
1801 # ifdef EXPERIMENTAL_DANE
1802 if (rc == DEFER && dane)
1803 {
1804 log_write(0, LOG_MAIN,
1805 "DANE attempt failed; no TLS connection to %s [%s]",
1806 host->name, host->address);
1807 }
1808 # endif
1809
1810 save_errno = ERRNO_TLSFAILURE;
1811 message = US"failure while setting up TLS session";
1812 send_quit = FALSE;
1813 goto TLS_FAILED;
1814 }
1815
1816 /* TLS session is set up */
1817
1818 for (addr = addrlist; addr; addr = addr->next)
1819 if (addr->transport_return == PENDING_DEFER)
1820 {
1821 addr->cipher = tls_out.cipher;
1822 addr->ourcert = tls_out.ourcert;
1823 addr->peercert = tls_out.peercert;
1824 addr->peerdn = tls_out.peerdn;
1825 addr->ocsp = tls_out.ocsp;
1826 }
1827 }
1828 }
1829
1830 /* if smtps, we'll have smtp_command set to something else; always safe to
1831 reset it here. */
1832 smtp_command = big_buffer;
1833
1834 /* If we started TLS, redo the EHLO/LHLO exchange over the secure channel. If
1835 helo_data is null, we are dealing with a connection that was passed from
1836 another process, and so we won't have expanded helo_data above. We have to
1837 expand it here. $sending_ip_address and $sending_port are set up right at the
1838 start of the Exim process (in exim.c). */
1839
1840 if (tls_out.active >= 0)
1841 {
1842 char *greeting_cmd;
1843 BOOL good_response;
1844
1845 if (helo_data == NULL)
1846 {
1847 helo_data = expand_string(ob->helo_data);
1848 if (helo_data == NULL)
1849 {
1850 uschar *message = string_sprintf("failed to expand helo_data: %s",
1851 expand_string_message);
1852 set_errno_nohost(addrlist, ERRNO_EXPANDFAIL, message, DEFER, FALSE);
1853 yield = DEFER;
1854 goto SEND_QUIT;
1855 }
1856 }
1857
1858 /* For SMTPS we need to wait for the initial OK response. */
1859 if (smtps)
1860 {
1861 good_response = smtp_read_response(&inblock, buffer, sizeof(buffer),
1862 '2', ob->command_timeout);
1863 #ifdef EXPERIMENTAL_DSN_INFO
1864 smtp_greeting = string_copy(buffer);
1865 #endif
1866 if (!good_response) goto RESPONSE_FAILED;
1867 }
1868
1869 if (esmtp)
1870 greeting_cmd = "EHLO";
1871 else
1872 {
1873 greeting_cmd = "HELO";
1874 DEBUG(D_transport)
1875 debug_printf("not sending EHLO (host matches hosts_avoid_esmtp)\n");
1876 }
1877
1878 if (smtp_write_command(&outblock, FALSE, "%s %s\r\n",
1879 lmtp? "LHLO" : greeting_cmd, helo_data) < 0)
1880 goto SEND_FAILED;
1881 good_response = smtp_read_response(&inblock, buffer, sizeof(buffer),
1882 '2', ob->command_timeout);
1883 #ifdef EXPERIMENTAL_DSN_INFO
1884 helo_response = string_copy(buffer);
1885 #endif
1886 if (!good_response) goto RESPONSE_FAILED;
1887 }
1888
1889 /* If the host is required to use a secure channel, ensure that we
1890 have one. */
1891
1892 else if ( smtps
1893 # ifdef EXPERIMENTAL_DANE
1894 || dane
1895 # endif
1896 || verify_check_given_host(&ob->hosts_require_tls, host) == OK
1897 )
1898 {
1899 save_errno = ERRNO_TLSREQUIRED;
1900 message = string_sprintf("a TLS session is required, but %s",
1901 tls_offered ? "an attempt to start TLS failed"
1902 : "the server did not offer TLS support");
1903 goto TLS_FAILED;
1904 }
1905 #endif /*SUPPORT_TLS*/
1906
1907 /* If TLS is active, we have just started it up and re-done the EHLO command,
1908 so its response needs to be analyzed. If TLS is not active and this is a
1909 continued session down a previously-used socket, we haven't just done EHLO, so
1910 we skip this. */
1911
1912 if (continue_hostname == NULL
1913 #ifdef SUPPORT_TLS
1914 || tls_out.active >= 0
1915 #endif
1916 )
1917 {
1918 if (esmtp || lmtp)
1919 peer_offered = ehlo_response(buffer, Ustrlen(buffer),
1920 0 /* no TLS */
1921 | (lmtp && ob->lmtp_ignore_quota ? PEER_OFFERED_IGNQ : 0)
1922 | PEER_OFFERED_PRDR
1923 #ifdef SUPPORT_I18N
1924 | (addrlist->prop.utf8_msg ? PEER_OFFERED_UTF8 : 0)
1925 /*XXX if we hand peercaps on to continued-conn processes,
1926 must not depend on this addr */
1927 #endif
1928 | PEER_OFFERED_DSN
1929 | PEER_OFFERED_PIPE
1930 | (ob->size_addition >= 0 ? PEER_OFFERED_SIZE : 0)
1931 );
1932
1933 /* Set for IGNOREQUOTA if the response to LHLO specifies support and the
1934 lmtp_ignore_quota option was set. */
1935
1936 igquotstr = peer_offered & PEER_OFFERED_IGNQ ? US" IGNOREQUOTA" : US"";
1937
1938 /* If the response to EHLO specified support for the SIZE parameter, note
1939 this, provided size_addition is non-negative. */
1940
1941 smtp_use_size = !!(peer_offered & PEER_OFFERED_SIZE);
1942
1943 /* Note whether the server supports PIPELINING. If hosts_avoid_esmtp matched
1944 the current host, esmtp will be false, so PIPELINING can never be used. If
1945 the current host matches hosts_avoid_pipelining, don't do it. */
1946
1947 smtp_use_pipelining = peer_offered & PEER_OFFERED_PIPE
1948 && verify_check_given_host(&ob->hosts_avoid_pipelining, host) != OK;
1949
1950 DEBUG(D_transport) debug_printf("%susing PIPELINING\n",
1951 smtp_use_pipelining ? "" : "not ");
1952
1953 #ifndef DISABLE_PRDR
1954 if ( peer_offered & PEER_OFFERED_PRDR
1955 && verify_check_given_host(&ob->hosts_try_prdr, host) != OK)
1956 peer_offered &= ~PEER_OFFERED_PRDR;
1957
1958 if (peer_offered & PEER_OFFERED_PRDR)
1959 {DEBUG(D_transport) debug_printf("PRDR usable\n");}
1960 #endif
1961
1962 /* Note if the server supports DSN */
1963 smtp_use_dsn = !!(peer_offered & PEER_OFFERED_DSN);
1964 DEBUG(D_transport) debug_printf("%susing DSN\n", smtp_use_dsn ? "" : "not ");
1965
1966 /* Note if the response to EHLO specifies support for the AUTH extension.
1967 If it has, check that this host is one we want to authenticate to, and do
1968 the business. The host name and address must be available when the
1969 authenticator's client driver is running. */
1970
1971 switch (yield = smtp_auth(buffer, sizeof(buffer), addrlist, host,
1972 ob, esmtp, &inblock, &outblock))
1973 {
1974 default: goto SEND_QUIT;
1975 case OK: break;
1976 case FAIL_SEND: goto SEND_FAILED;
1977 case FAIL: goto RESPONSE_FAILED;
1978 }
1979 }
1980
1981 /* The setting up of the SMTP call is now complete. Any subsequent errors are
1982 message-specific. */
1983
1984 setting_up = FALSE;
1985
1986 #ifdef SUPPORT_I18N
1987 if (addrlist->prop.utf8_msg)
1988 {
1989 utf8_needed = !addrlist->prop.utf8_downcvt
1990 && !addrlist->prop.utf8_downcvt_maybe;
1991 DEBUG(D_transport) if (!utf8_needed) debug_printf("utf8: %s downconvert\n",
1992 addrlist->prop.utf8_downcvt ? "mandatory" : "optional");
1993 }
1994
1995 /* If this is an international message we need the host to speak SMTPUTF8 */
1996 if (utf8_needed && !(peer_offered & PEER_OFFERED_UTF8))
1997 {
1998 errno = ERRNO_UTF8_FWD;
1999 goto RESPONSE_FAILED;
2000 }
2001 #endif
2002
2003 /* If there is a filter command specified for this transport, we can now
2004 set it up. This cannot be done until the identify of the host is known. */
2005
2006 if (tblock->filter_command != NULL)
2007 {
2008 BOOL rc;
2009 uschar buffer[64];
2010 sprintf(CS buffer, "%.50s transport", tblock->name);
2011 rc = transport_set_up_command(&transport_filter_argv, tblock->filter_command,
2012 TRUE, DEFER, addrlist, buffer, NULL);
2013 transport_filter_timeout = tblock->filter_timeout;
2014
2015 /* On failure, copy the error to all addresses, abandon the SMTP call, and
2016 yield ERROR. */
2017
2018 if (!rc)
2019 {
2020 set_errno_nohost(addrlist->next, addrlist->basic_errno, addrlist->message, DEFER,
2021 FALSE);
2022 yield = ERROR;
2023 goto SEND_QUIT;
2024 }
2025 }
2026
2027
2028 /* For messages that have more than the maximum number of envelope recipients,
2029 we want to send several transactions down the same SMTP connection. (See
2030 comments in deliver.c as to how this reconciles, heuristically, with
2031 remote_max_parallel.) This optimization was added to Exim after the following
2032 code was already working. The simplest way to put it in without disturbing the
2033 code was to use a goto to jump back to this point when there is another
2034 transaction to handle. */
2035
2036 SEND_MESSAGE:
2037 sync_addr = first_addr;
2038 address_count = 0;
2039 ok = FALSE;
2040 send_rset = TRUE;
2041 completed_address = FALSE;
2042
2043
2044 /* Initiate a message transfer. If we know the receiving MTA supports the SIZE
2045 qualification, send it, adding something to the message size to allow for
2046 imprecision and things that get added en route. Exim keeps the number of lines
2047 in a message, so we can give an accurate value for the original message, but we
2048 need some additional to handle added headers. (Double "." characters don't get
2049 included in the count.) */
2050
2051 p = buffer;
2052 *p = 0;
2053
2054 if (smtp_use_size)
2055 {
2056 sprintf(CS p, " SIZE=%d", message_size+message_linecount+ob->size_addition);
2057 while (*p) p++;
2058 }
2059
2060 #ifndef DISABLE_PRDR
2061 prdr_active = FALSE;
2062 if (peer_offered & PEER_OFFERED_PRDR)
2063 for (addr = first_addr; addr; addr = addr->next)
2064 if (addr->transport_return == PENDING_DEFER)
2065 {
2066 for (addr = addr->next; addr; addr = addr->next)
2067 if (addr->transport_return == PENDING_DEFER)
2068 { /* at least two recipients to send */
2069 prdr_active = TRUE;
2070 sprintf(CS p, " PRDR"); p += 5;
2071 break;
2072 }
2073 break;
2074 }
2075 #endif
2076
2077 #ifdef SUPPORT_I18N
2078 if ( addrlist->prop.utf8_msg
2079 && !addrlist->prop.utf8_downcvt
2080 && peer_offered & PEER_OFFERED_UTF8
2081 )
2082 sprintf(CS p, " SMTPUTF8"), p += 9;
2083 #endif
2084
2085 /* check if all addresses have lasthop flag */
2086 /* do not send RET and ENVID if true */
2087 for (dsn_all_lasthop = TRUE, addr = first_addr;
2088 address_count < max_rcpt && addr != NULL;
2089 addr = addr->next)
2090 if ((addr->dsn_flags & rf_dsnlasthop) != 1)
2091 {
2092 dsn_all_lasthop = FALSE;
2093 break;
2094 }
2095
2096 /* Add any DSN flags to the mail command */
2097
2098 if (smtp_use_dsn && !dsn_all_lasthop)
2099 {
2100 if (dsn_ret == dsn_ret_hdrs)
2101 {
2102 Ustrcpy(p, " RET=HDRS");
2103 while (*p) p++;
2104 }
2105 else if (dsn_ret == dsn_ret_full)
2106 {
2107 Ustrcpy(p, " RET=FULL");
2108 while (*p) p++;
2109 }
2110 if (dsn_envid != NULL)
2111 {
2112 string_format(p, sizeof(buffer) - (p-buffer), " ENVID=%s", dsn_envid);
2113 while (*p) p++;
2114 }
2115 }
2116
2117 /* If an authenticated_sender override has been specified for this transport
2118 instance, expand it. If the expansion is forced to fail, and there was already
2119 an authenticated_sender for this message, the original value will be used.
2120 Other expansion failures are serious. An empty result is ignored, but there is
2121 otherwise no check - this feature is expected to be used with LMTP and other
2122 cases where non-standard addresses (e.g. without domains) might be required. */
2123
2124 if (smtp_mail_auth_str(p, sizeof(buffer) - (p-buffer), addrlist, ob))
2125 {
2126 yield = ERROR;
2127 goto SEND_QUIT;
2128 }
2129
2130 /* From here until we send the DATA command, we can make use of PIPELINING
2131 if the server host supports it. The code has to be able to check the responses
2132 at any point, for when the buffer fills up, so we write it totally generally.
2133 When PIPELINING is off, each command written reports that it has flushed the
2134 buffer. */
2135
2136 pending_MAIL = TRUE; /* The block starts with MAIL */
2137
2138 {
2139 uschar * s = return_path;
2140 #ifdef SUPPORT_I18N
2141 uschar * errstr = NULL;
2142
2143 /* If we must downconvert, do the from-address here. Remember we had to
2144 for the to-addresses (done below), and also (ugly) for re-doing when building
2145 the delivery log line. */
2146
2147 if ( addrlist->prop.utf8_msg
2148 && (addrlist->prop.utf8_downcvt || !(peer_offered & PEER_OFFERED_UTF8))
2149 )
2150 {
2151 if (s = string_address_utf8_to_alabel(return_path, &errstr), errstr)
2152 {
2153 set_errno_nohost(addrlist, ERRNO_EXPANDFAIL, errstr, DEFER, FALSE);
2154 yield = ERROR;
2155 goto SEND_QUIT;
2156 }
2157 setflag(addrlist, af_utf8_downcvt);
2158 }
2159 #endif
2160
2161 rc = smtp_write_command(&outblock, smtp_use_pipelining,
2162 "MAIL FROM:<%s>%s\r\n", s, buffer);
2163 }
2164
2165 mail_command = string_copy(big_buffer); /* Save for later error message */
2166
2167 switch(rc)
2168 {
2169 case -1: /* Transmission error */
2170 goto SEND_FAILED;
2171
2172 case +1: /* Block was sent */
2173 if (!smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
2174 ob->command_timeout))
2175 {
2176 if (errno == 0 && buffer[0] == '4')
2177 {
2178 errno = ERRNO_MAIL4XX;
2179 addrlist->more_errno |= ((buffer[1] - '0')*10 + buffer[2] - '0') << 8;
2180 }
2181 goto RESPONSE_FAILED;
2182 }
2183 pending_MAIL = FALSE;
2184 break;
2185 }
2186
2187 /* Pass over all the relevant recipient addresses for this host, which are the
2188 ones that have status PENDING_DEFER. If we are using PIPELINING, we can send
2189 several before we have to read the responses for those seen so far. This
2190 checking is done by a subroutine because it also needs to be done at the end.
2191 Send only up to max_rcpt addresses at a time, leaving first_addr pointing to
2192 the next one if not all are sent.
2193
2194 In the MUA wrapper situation, we want to flush the PIPELINING buffer for the
2195 last address because we want to abort if any recipients have any kind of
2196 problem, temporary or permanent. We know that all recipient addresses will have
2197 the PENDING_DEFER status, because only one attempt is ever made, and we know
2198 that max_rcpt will be large, so all addresses will be done at once. */
2199
2200 for (addr = first_addr;
2201 address_count < max_rcpt && addr != NULL;
2202 addr = addr->next)
2203 {
2204 int count;
2205 BOOL no_flush;
2206 uschar * rcpt_addr;
2207
2208 addr->dsn_aware = smtp_use_dsn ? dsn_support_yes : dsn_support_no;
2209
2210 if (addr->transport_return != PENDING_DEFER) continue;
2211
2212 address_count++;
2213 no_flush = smtp_use_pipelining && (!mua_wrapper || addr->next != NULL);
2214
2215 /* Add any DSN flags to the rcpt command and add to the sent string */
2216
2217 p = buffer;
2218 *p = 0;
2219
2220 if (smtp_use_dsn && (addr->dsn_flags & rf_dsnlasthop) != 1)
2221 {
2222 if ((addr->dsn_flags & rf_dsnflags) != 0)
2223 {
2224 int i;
2225 BOOL first = TRUE;
2226 Ustrcpy(p, " NOTIFY=");
2227 while (*p) p++;
2228 for (i = 0; i < 4; i++)
2229 if ((addr->dsn_flags & rf_list[i]) != 0)
2230 {
2231 if (!first) *p++ = ',';
2232 first = FALSE;
2233 Ustrcpy(p, rf_names[i]);
2234 while (*p) p++;
2235 }
2236 }
2237
2238 if (addr->dsn_orcpt != NULL)
2239 {
2240 string_format(p, sizeof(buffer) - (p-buffer), " ORCPT=%s",
2241 addr->dsn_orcpt);
2242 while (*p) p++;
2243 }
2244 }
2245
2246 /* Now send the RCPT command, and process outstanding responses when
2247 necessary. After a timeout on RCPT, we just end the function, leaving the
2248 yield as OK, because this error can often mean that there is a problem with
2249 just one address, so we don't want to delay the host. */
2250
2251 rcpt_addr = transport_rcpt_address(addr, tblock->rcpt_include_affixes);
2252
2253 #ifdef SUPPORT_I18N
2254 {
2255 uschar * dummy_errstr;
2256 if ( testflag(addrlist, af_utf8_downcvt)
2257 && (rcpt_addr = string_address_utf8_to_alabel(rcpt_addr, &dummy_errstr),
2258 dummy_errstr
2259 ) )
2260 {
2261 errno = ERRNO_EXPANDFAIL;
2262 goto SEND_FAILED;
2263 }
2264 }
2265 #endif
2266
2267 count = smtp_write_command(&outblock, no_flush, "RCPT TO:<%s>%s%s\r\n",
2268 rcpt_addr, igquotstr, buffer);
2269
2270 if (count < 0) goto SEND_FAILED;
2271 if (count > 0)
2272 {
2273 switch(sync_responses(first_addr, tblock->rcpt_include_affixes,
2274 &sync_addr, host, count, ob->address_retry_include_sender,
2275 pending_MAIL, 0, &inblock, ob->command_timeout, buffer,
2276 sizeof(buffer)))
2277 {
2278 case 3: ok = TRUE; /* 2xx & 5xx => OK & progress made */
2279 case 2: completed_address = TRUE; /* 5xx (only) => progress made */
2280 break;
2281
2282 case 1: ok = TRUE; /* 2xx (only) => OK, but if LMTP, */
2283 if (!lmtp) completed_address = TRUE; /* can't tell about progress yet */
2284 case 0: /* No 2xx or 5xx, but no probs */
2285 break;
2286
2287 case -1: goto END_OFF; /* Timeout on RCPT */
2288 default: goto RESPONSE_FAILED; /* I/O error, or any MAIL error */
2289 }
2290 pending_MAIL = FALSE; /* Dealt with MAIL */
2291 }
2292 } /* Loop for next address */
2293
2294 /* If we are an MUA wrapper, abort if any RCPTs were rejected, either
2295 permanently or temporarily. We should have flushed and synced after the last
2296 RCPT. */
2297
2298 if (mua_wrapper)
2299 {
2300 address_item *badaddr;
2301 for (badaddr = first_addr; badaddr; badaddr = badaddr->next)
2302 if (badaddr->transport_return != PENDING_OK)
2303 {
2304 /*XXX could we find a better errno than 0 here? */
2305 set_errno_nohost(addrlist, 0, badaddr->message, FAIL,
2306 testflag(badaddr, af_pass_message));
2307 ok = FALSE;
2308 break;
2309 }
2310 }
2311
2312 /* If ok is TRUE, we know we have got at least one good recipient, and must now
2313 send DATA, but if it is FALSE (in the normal, non-wrapper case), we may still
2314 have a good recipient buffered up if we are pipelining. We don't want to waste
2315 time sending DATA needlessly, so we only send it if either ok is TRUE or if we
2316 are pipelining. The responses are all handled by sync_responses(). */
2317
2318 if (ok || (smtp_use_pipelining && !mua_wrapper))
2319 {
2320 int count = smtp_write_command(&outblock, FALSE, "DATA\r\n");
2321 if (count < 0) goto SEND_FAILED;
2322 switch(sync_responses(first_addr, tblock->rcpt_include_affixes, &sync_addr,
2323 host, count, ob->address_retry_include_sender, pending_MAIL,
2324 ok? +1 : -1, &inblock, ob->command_timeout, buffer, sizeof(buffer)))
2325 {
2326 case 3: ok = TRUE; /* 2xx & 5xx => OK & progress made */
2327 case 2: completed_address = TRUE; /* 5xx (only) => progress made */
2328 break;
2329
2330 case 1: ok = TRUE; /* 2xx (only) => OK, but if LMTP, */
2331 if (!lmtp) completed_address = TRUE; /* can't tell about progress yet */
2332 case 0: break; /* No 2xx or 5xx, but no probs */
2333
2334 case -1: goto END_OFF; /* Timeout on RCPT */
2335 default: goto RESPONSE_FAILED; /* I/O error, or any MAIL/DATA error */
2336 }
2337 }
2338
2339 /* Save the first address of the next batch. */
2340
2341 first_addr = addr;
2342
2343 /* If there were no good recipients (but otherwise there have been no
2344 problems), just set ok TRUE, since we have handled address-specific errors
2345 already. Otherwise, it's OK to send the message. Use the check/escape mechanism
2346 for handling the SMTP dot-handling protocol, flagging to apply to headers as
2347 well as body. Set the appropriate timeout value to be used for each chunk.
2348 (Haven't been able to make it work using select() for writing yet.) */
2349
2350 if (!ok) ok = TRUE; else
2351 {
2352 sigalrm_seen = FALSE;
2353 transport_write_timeout = ob->data_timeout;
2354 smtp_command = US"sending data block"; /* For error messages */
2355 DEBUG(D_transport|D_v)
2356 debug_printf(" SMTP>> writing message and terminating \".\"\n");
2357 transport_count = 0;
2358
2359 #ifndef DISABLE_DKIM
2360 ok = dkim_transport_write_message(addrlist, inblock.sock,
2361 topt_use_crlf | topt_end_dot | topt_escape_headers |
2362 (tblock->body_only? topt_no_headers : 0) |
2363 (tblock->headers_only? topt_no_body : 0) |
2364 (tblock->return_path_add? topt_add_return_path : 0) |
2365 (tblock->delivery_date_add? topt_add_delivery_date : 0) |
2366 (tblock->envelope_to_add? topt_add_envelope_to : 0),
2367 0, /* No size limit */
2368 tblock->add_headers, tblock->remove_headers,
2369 US".", US"..", /* Escaping strings */
2370 tblock->rewrite_rules, tblock->rewrite_existflags,
2371 ob->dkim_private_key, ob->dkim_domain, ob->dkim_selector,
2372 ob->dkim_canon, ob->dkim_strict, ob->dkim_sign_headers
2373 );
2374 #else
2375 ok = transport_write_message(addrlist, inblock.sock,
2376 topt_use_crlf | topt_end_dot | topt_escape_headers |
2377 (tblock->body_only? topt_no_headers : 0) |
2378 (tblock->headers_only? topt_no_body : 0) |
2379 (tblock->return_path_add? topt_add_return_path : 0) |
2380 (tblock->delivery_date_add? topt_add_delivery_date : 0) |
2381 (tblock->envelope_to_add? topt_add_envelope_to : 0),
2382 0, /* No size limit */
2383 tblock->add_headers, tblock->remove_headers,
2384 US".", US"..", /* Escaping strings */
2385 tblock->rewrite_rules, tblock->rewrite_existflags);
2386 #endif
2387
2388 /* transport_write_message() uses write() because it is called from other
2389 places to write to non-sockets. This means that under some OS (e.g. Solaris)
2390 it can exit with "Broken pipe" as its error. This really means that the
2391 socket got closed at the far end. */
2392
2393 transport_write_timeout = 0; /* for subsequent transports */
2394
2395 /* Failure can either be some kind of I/O disaster (including timeout),
2396 or the failure of a transport filter or the expansion of added headers. */
2397
2398 if (!ok)
2399 {
2400 buffer[0] = 0; /* There hasn't been a response */
2401 goto RESPONSE_FAILED;
2402 }
2403
2404 /* We used to send the terminating "." explicitly here, but because of
2405 buffering effects at both ends of TCP/IP connections, you don't gain
2406 anything by keeping it separate, so it might as well go in the final
2407 data buffer for efficiency. This is now done by setting the topt_end_dot
2408 flag above. */
2409
2410 smtp_command = US"end of data";
2411
2412 #ifndef DISABLE_PRDR
2413 /* For PRDR we optionally get a partial-responses warning
2414 * followed by the individual responses, before going on with
2415 * the overall response. If we don't get the warning then deal
2416 * with per non-PRDR. */
2417 if(prdr_active)
2418 {
2419 ok = smtp_read_response(&inblock, buffer, sizeof(buffer), '3',
2420 ob->final_timeout);
2421 if (!ok && errno == 0)
2422 switch(buffer[0])
2423 {
2424 case '2': prdr_active = FALSE;
2425 ok = TRUE;
2426 break;
2427 case '4': errno = ERRNO_DATA4XX;
2428 addrlist->more_errno |= ((buffer[1] - '0')*10 + buffer[2] - '0') << 8;
2429 break;
2430 }
2431 }
2432 else
2433 #endif
2434
2435 /* For non-PRDR SMTP, we now read a single response that applies to the
2436 whole message. If it is OK, then all the addresses have been delivered. */
2437
2438 if (!lmtp)
2439 {
2440 ok = smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
2441 ob->final_timeout);
2442 if (!ok && errno == 0 && buffer[0] == '4')
2443 {
2444 errno = ERRNO_DATA4XX;
2445 addrlist->more_errno |= ((buffer[1] - '0')*10 + buffer[2] - '0') << 8;
2446 }
2447 }
2448
2449 /* For LMTP, we get back a response for every RCPT command that we sent;
2450 some may be accepted and some rejected. For those that get a response, their
2451 status is fixed; any that are accepted have been handed over, even if later
2452 responses crash - at least, that's how I read RFC 2033.
2453
2454 If all went well, mark the recipient addresses as completed, record which
2455 host/IPaddress they were delivered to, and cut out RSET when sending another
2456 message down the same channel. Write the completed addresses to the journal
2457 now so that they are recorded in case there is a crash of hardware or
2458 software before the spool gets updated. Also record the final SMTP
2459 confirmation if needed (for SMTP only). */
2460
2461 if (ok)
2462 {
2463 int flag = '=';
2464 int delivery_time = (int)(time(NULL) - start_delivery_time);
2465 int len;
2466 uschar *conf = NULL;
2467 send_rset = FALSE;
2468
2469 /* Set up confirmation if needed - applies only to SMTP */
2470
2471 if (
2472 #ifdef DISABLE_EVENT
2473 LOGGING(smtp_confirmation) &&
2474 #endif
2475 !lmtp
2476 )
2477 {
2478 const uschar *s = string_printing(buffer);
2479 /* deconst cast ok here as string_printing was checked to have alloc'n'copied */
2480 conf = (s == buffer)? (uschar *)string_copy(s) : US s;
2481 }
2482
2483 /* Process all transported addresses - for LMTP or PRDR, read a status for
2484 each one. */
2485
2486 for (addr = addrlist; addr != first_addr; addr = addr->next)
2487 {
2488 if (addr->transport_return != PENDING_OK) continue;
2489
2490 /* LMTP - if the response fails badly (e.g. timeout), use it for all the
2491 remaining addresses. Otherwise, it's a return code for just the one
2492 address. For temporary errors, add a retry item for the address so that
2493 it doesn't get tried again too soon. */
2494
2495 #ifndef DISABLE_PRDR
2496 if (lmtp || prdr_active)
2497 #else
2498 if (lmtp)
2499 #endif
2500 {
2501 if (!smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
2502 ob->final_timeout))
2503 {
2504 if (errno != 0 || buffer[0] == 0) goto RESPONSE_FAILED;
2505 addr->message = string_sprintf(
2506 #ifndef DISABLE_PRDR
2507 "%s error after %s: %s", prdr_active ? "PRDR":"LMTP",
2508 #else
2509 "LMTP error after %s: %s",
2510 #endif
2511 big_buffer, string_printing(buffer));
2512 setflag(addr, af_pass_message); /* Allow message to go to user */
2513 if (buffer[0] == '5')
2514 addr->transport_return = FAIL;
2515 else
2516 {
2517 errno = ERRNO_DATA4XX;
2518 addr->more_errno |= ((buffer[1] - '0')*10 + buffer[2] - '0') << 8;
2519 addr->transport_return = DEFER;
2520 #ifndef DISABLE_PRDR
2521 if (!prdr_active)
2522 #endif
2523 retry_add_item(addr, addr->address_retry_key, 0);
2524 }
2525 continue;
2526 }
2527 completed_address = TRUE; /* NOW we can set this flag */
2528 if (LOGGING(smtp_confirmation))
2529 {
2530 const uschar *s = string_printing(buffer);
2531 /* deconst cast ok here as string_printing was checked to have alloc'n'copied */
2532 conf = (s == buffer)? (uschar *)string_copy(s) : US s;
2533 }
2534 }
2535
2536 /* SMTP, or success return from LMTP for this address. Pass back the
2537 actual host that was used. */
2538
2539 addr->transport_return = OK;
2540 addr->more_errno = delivery_time;
2541 addr->host_used = host;
2542 addr->special_action = flag;
2543 addr->message = conf;
2544 #ifndef DISABLE_PRDR
2545 if (prdr_active) addr->flags |= af_prdr_used;
2546 #endif
2547 flag = '-';
2548
2549 #ifndef DISABLE_PRDR
2550 if (!prdr_active)
2551 #endif
2552 {
2553 /* Update the journal. For homonymic addresses, use the base address plus
2554 the transport name. See lots of comments in deliver.c about the reasons
2555 for the complications when homonyms are involved. Just carry on after
2556 write error, as it may prove possible to update the spool file later. */
2557
2558 if (testflag(addr, af_homonym))
2559 sprintf(CS buffer, "%.500s/%s\n", addr->unique + 3, tblock->name);
2560 else
2561 sprintf(CS buffer, "%.500s\n", addr->unique);
2562
2563 DEBUG(D_deliver) debug_printf("journalling %s\n", buffer);
2564 len = Ustrlen(CS buffer);
2565 if (write(journal_fd, buffer, len) != len)
2566 log_write(0, LOG_MAIN|LOG_PANIC, "failed to write journal for "
2567 "%s: %s", buffer, strerror(errno));
2568 }
2569 }
2570
2571 #ifndef DISABLE_PRDR
2572 if (prdr_active)
2573 {
2574 /* PRDR - get the final, overall response. For any non-success
2575 upgrade all the address statuses. */
2576 ok = smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
2577 ob->final_timeout);
2578 if (!ok)
2579 {
2580 if(errno == 0 && buffer[0] == '4')
2581 {
2582 errno = ERRNO_DATA4XX;
2583 addrlist->more_errno |= ((buffer[1] - '0')*10 + buffer[2] - '0') << 8;
2584 }
2585 for (addr = addrlist; addr != first_addr; addr = addr->next)
2586 if (buffer[0] == '5' || addr->transport_return == OK)
2587 addr->transport_return = PENDING_OK; /* allow set_errno action */
2588 goto RESPONSE_FAILED;
2589 }
2590
2591 /* Update the journal, or setup retry. */
2592 for (addr = addrlist; addr != first_addr; addr = addr->next)
2593 if (addr->transport_return == OK)
2594 {
2595 if (testflag(addr, af_homonym))
2596 sprintf(CS buffer, "%.500s/%s\n", addr->unique + 3, tblock->name);
2597 else
2598 sprintf(CS buffer, "%.500s\n", addr->unique);
2599
2600 DEBUG(D_deliver) debug_printf("journalling(PRDR) %s\n", buffer);
2601 len = Ustrlen(CS buffer);
2602 if (write(journal_fd, buffer, len) != len)
2603 log_write(0, LOG_MAIN|LOG_PANIC, "failed to write journal for "
2604 "%s: %s", buffer, strerror(errno));
2605 }
2606 else if (addr->transport_return == DEFER)
2607 retry_add_item(addr, addr->address_retry_key, -2);
2608 }
2609 #endif
2610
2611 /* Ensure the journal file is pushed out to disk. */
2612
2613 if (EXIMfsync(journal_fd) < 0)
2614 log_write(0, LOG_MAIN|LOG_PANIC, "failed to fsync journal: %s",
2615 strerror(errno));
2616 }
2617 }
2618
2619
2620 /* Handle general (not specific to one address) failures here. The value of ok
2621 is used to skip over this code on the falling through case. A timeout causes a
2622 deferral. Other errors may defer or fail according to the response code, and
2623 may set up a special errno value, e.g. after connection chopped, which is
2624 assumed if errno == 0 and there is no text in the buffer. If control reaches
2625 here during the setting up phase (i.e. before MAIL FROM) then always defer, as
2626 the problem is not related to this specific message. */
2627
2628 if (!ok)
2629 {
2630 int code, set_rc;
2631 uschar * set_message;
2632
2633 RESPONSE_FAILED:
2634 {
2635 save_errno = errno;
2636 message = NULL;
2637 send_quit = check_response(host, &save_errno, addrlist->more_errno,
2638 buffer, &code, &message, &pass_message);
2639 goto FAILED;
2640 }
2641
2642 SEND_FAILED:
2643 {
2644 save_errno = errno;
2645 code = '4';
2646 message = US string_sprintf("send() to %s [%s] failed: %s",
2647 host->name, host->address, strerror(save_errno));
2648 send_quit = FALSE;
2649 goto FAILED;
2650 }
2651
2652 /* This label is jumped to directly when a TLS negotiation has failed,
2653 or was not done for a host for which it is required. Values will be set
2654 in message and save_errno, and setting_up will always be true. Treat as
2655 a temporary error. */
2656
2657 #ifdef SUPPORT_TLS
2658 TLS_FAILED:
2659 code = '4';
2660 #endif
2661
2662 /* If the failure happened while setting up the call, see if the failure was
2663 a 5xx response (this will either be on connection, or following HELO - a 5xx
2664 after EHLO causes it to try HELO). If so, fail all addresses, as this host is
2665 never going to accept them. For other errors during setting up (timeouts or
2666 whatever), defer all addresses, and yield DEFER, so that the host is not
2667 tried again for a while. */
2668
2669 FAILED:
2670 ok = FALSE; /* For when reached by GOTO */
2671 set_message = message;
2672
2673 if (setting_up)
2674 {
2675 if (code == '5')
2676 set_rc = FAIL;
2677 else
2678 yield = set_rc = DEFER;
2679 }
2680
2681 /* We want to handle timeouts after MAIL or "." and loss of connection after
2682 "." specially. They can indicate a problem with the sender address or with
2683 the contents of the message rather than a real error on the connection. These
2684 cases are treated in the same way as a 4xx response. This next bit of code
2685 does the classification. */
2686
2687 else
2688 {
2689 BOOL message_error;
2690
2691 switch(save_errno)
2692 {
2693 #ifdef SUPPORT_I18N
2694 case ERRNO_UTF8_FWD:
2695 code = '5';
2696 /*FALLTHROUGH*/
2697 #endif
2698 case 0:
2699 case ERRNO_MAIL4XX:
2700 case ERRNO_DATA4XX:
2701 message_error = TRUE;
2702 break;
2703
2704 case ETIMEDOUT:
2705 message_error = Ustrncmp(smtp_command,"MAIL",4) == 0 ||
2706 Ustrncmp(smtp_command,"end ",4) == 0;
2707 break;
2708
2709 case ERRNO_SMTPCLOSED:
2710 message_error = Ustrncmp(smtp_command,"end ",4) == 0;
2711 break;
2712
2713 default:
2714 message_error = FALSE;
2715 break;
2716 }
2717
2718 /* Handle the cases that are treated as message errors. These are:
2719
2720 (a) negative response or timeout after MAIL
2721 (b) negative response after DATA
2722 (c) negative response or timeout or dropped connection after "."
2723 (d) utf8 support required and not offered
2724
2725 It won't be a negative response or timeout after RCPT, as that is dealt
2726 with separately above. The action in all cases is to set an appropriate
2727 error code for all the addresses, but to leave yield set to OK because the
2728 host itself has not failed. Of course, it might in practice have failed
2729 when we've had a timeout, but if so, we'll discover that at the next
2730 delivery attempt. For a temporary error, set the message_defer flag, and
2731 write to the logs for information if this is not the last host. The error
2732 for the last host will be logged as part of the address's log line. */
2733
2734 if (message_error)
2735 {
2736 if (mua_wrapper) code = '5'; /* Force hard failure in wrapper mode */
2737
2738 /* If there's an errno, the message contains just the identity of
2739 the host. */
2740
2741 if (code == '5')
2742 set_rc = FAIL;
2743 else /* Anything other than 5 is treated as temporary */
2744 {
2745 set_rc = DEFER;
2746 if (save_errno > 0)
2747 message = US string_sprintf("%s: %s", message, strerror(save_errno));
2748 if (host->next != NULL) log_write(0, LOG_MAIN, "%s", message);
2749 msglog_line(host, message);
2750 *message_defer = TRUE;
2751 }
2752 }
2753
2754 /* Otherwise, we have an I/O error or a timeout other than after MAIL or
2755 ".", or some other transportation error. We defer all addresses and yield
2756 DEFER, except for the case of failed add_headers expansion, or a transport
2757 filter failure, when the yield should be ERROR, to stop it trying other
2758 hosts. */
2759
2760 else
2761 {
2762 set_rc = DEFER;
2763 yield = (save_errno == ERRNO_CHHEADER_FAIL ||
2764 save_errno == ERRNO_FILTER_FAIL)? ERROR : DEFER;
2765 }
2766 }
2767
2768 set_errno(addrlist, save_errno, set_message, set_rc, pass_message, host
2769 #ifdef EXPERIMENTAL_DSN_INFO
2770 , smtp_greeting, helo_response
2771 #endif
2772 );
2773 }
2774
2775
2776 /* If all has gone well, send_quit will be set TRUE, implying we can end the
2777 SMTP session tidily. However, if there were too many addresses to send in one
2778 message (indicated by first_addr being non-NULL) we want to carry on with the
2779 rest of them. Also, it is desirable to send more than one message down the SMTP
2780 connection if there are several waiting, provided we haven't already sent so
2781 many as to hit the configured limit. The function transport_check_waiting looks
2782 for a waiting message and returns its id. Then transport_pass_socket tries to
2783 set up a continued delivery by passing the socket on to another process. The
2784 variable send_rset is FALSE if a message has just been successfully transfered.
2785
2786 If we are already sending down a continued channel, there may be further
2787 addresses not yet delivered that are aimed at the same host, but which have not
2788 been passed in this run of the transport. In this case, continue_more will be
2789 true, and all we should do is send RSET if necessary, and return, leaving the
2790 channel open.
2791
2792 However, if no address was disposed of, i.e. all addresses got 4xx errors, we
2793 do not want to continue with other messages down the same channel, because that
2794 can lead to looping between two or more messages, all with the same,
2795 temporarily failing address(es). [The retry information isn't updated yet, so
2796 new processes keep on trying.] We probably also don't want to try more of this
2797 message's addresses either.
2798
2799 If we have started a TLS session, we have to end it before passing the
2800 connection to a new process. However, not all servers can handle this (Exim
2801 can), so we do not pass such a connection on if the host matches
2802 hosts_nopass_tls. */
2803
2804 DEBUG(D_transport)
2805 debug_printf("ok=%d send_quit=%d send_rset=%d continue_more=%d "
2806 "yield=%d first_address is %sNULL\n", ok, send_quit, send_rset,
2807 continue_more, yield, (first_addr == NULL)? "":"not ");
2808
2809 if (completed_address && ok && send_quit)
2810 {
2811 BOOL more;
2812 smtp_compare_t t_compare;
2813
2814 t_compare.tblock = tblock;
2815 t_compare.current_sender_address = sender_address;
2816
2817 if ( first_addr != NULL
2818 || continue_more
2819 || ( ( tls_out.active < 0
2820 || verify_check_given_host(&ob->hosts_nopass_tls, host) != OK
2821 )
2822 &&
2823 transport_check_waiting(tblock->name, host->name,
2824 tblock->connection_max_messages, new_message_id, &more,
2825 (oicf)smtp_are_same_identities, (void*)&t_compare)
2826 ) )
2827 {
2828 uschar *msg;
2829 BOOL pass_message;
2830
2831 if (send_rset)
2832 {
2833 if (! (ok = smtp_write_command(&outblock, FALSE, "RSET\r\n") >= 0))
2834 {
2835 msg = US string_sprintf("send() to %s [%s] failed: %s", host->name,
2836 host->address, strerror(save_errno));
2837 send_quit = FALSE;
2838 }
2839 else if (! (ok = smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
2840 ob->command_timeout)))
2841 {
2842 int code;
2843 send_quit = check_response(host, &errno, 0, buffer, &code, &msg,
2844 &pass_message);
2845 if (!send_quit)
2846 {
2847 DEBUG(D_transport) debug_printf("H=%s [%s] %s\n",
2848 host->name, host->address, msg);
2849 }
2850 }
2851 }
2852
2853 /* Either RSET was not needed, or it succeeded */
2854
2855 if (ok)
2856 {
2857 if (first_addr != NULL) /* More addresses still to be sent */
2858 { /* in this run of the transport */
2859 continue_sequence++; /* Causes * in logging */
2860 goto SEND_MESSAGE;
2861 }
2862 if (continue_more) return yield; /* More addresses for another run */
2863
2864 /* Pass the socket to a new Exim process. Before doing so, we must shut
2865 down TLS. Not all MTAs allow for the continuation of the SMTP session
2866 when TLS is shut down. We test for this by sending a new EHLO. If we
2867 don't get a good response, we don't attempt to pass the socket on. */
2868
2869 #ifdef SUPPORT_TLS
2870 if (tls_out.active >= 0)
2871 {
2872 tls_close(FALSE, TRUE);
2873 if (smtps)
2874 ok = FALSE;
2875 else
2876 ok = smtp_write_command(&outblock,FALSE,"EHLO %s\r\n",helo_data) >= 0 &&
2877 smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
2878 ob->command_timeout);
2879 }
2880 #endif
2881
2882 /* If the socket is successfully passed, we musn't send QUIT (or
2883 indeed anything!) from here. */
2884
2885 /*XXX DSN_INFO: assume likely to do new HELO; but for greet we'll want to
2886 propagate it from the initial
2887 */
2888 if (ok && transport_pass_socket(tblock->name, host->name, host->address,
2889 new_message_id, inblock.sock))
2890 {
2891 send_quit = FALSE;
2892 }
2893 }
2894
2895 /* If RSET failed and there are addresses left, they get deferred. */
2896
2897 else set_errno(first_addr, errno, msg, DEFER, FALSE, host
2898 #ifdef EXPERIMENTAL_DSN_INFO
2899 , smtp_greeting, helo_response
2900 #endif
2901 );
2902 }
2903 }
2904
2905 /* End off tidily with QUIT unless the connection has died or the socket has
2906 been passed to another process. There has been discussion on the net about what
2907 to do after sending QUIT. The wording of the RFC suggests that it is necessary
2908 to wait for a response, but on the other hand, there isn't anything one can do
2909 with an error response, other than log it. Exim used to do that. However,
2910 further discussion suggested that it is positively advantageous not to wait for
2911 the response, but to close the session immediately. This is supposed to move
2912 the TCP/IP TIME_WAIT state from the server to the client, thereby removing some
2913 load from the server. (Hosts that are both servers and clients may not see much
2914 difference, of course.) Further discussion indicated that this was safe to do
2915 on Unix systems which have decent implementations of TCP/IP that leave the
2916 connection around for a while (TIME_WAIT) after the application has gone away.
2917 This enables the response sent by the server to be properly ACKed rather than
2918 timed out, as can happen on broken TCP/IP implementations on other OS.
2919
2920 This change is being made on 31-Jul-98. After over a year of trouble-free
2921 operation, the old commented-out code was removed on 17-Sep-99. */
2922
2923 SEND_QUIT:
2924 if (send_quit) (void)smtp_write_command(&outblock, FALSE, "QUIT\r\n");
2925
2926 END_OFF:
2927
2928 #ifdef SUPPORT_TLS
2929 tls_close(FALSE, TRUE);
2930 #endif
2931
2932 /* Close the socket, and return the appropriate value, first setting
2933 works because the NULL setting is passed back to the calling process, and
2934 remote_max_parallel is forced to 1 when delivering over an existing connection,
2935
2936 If all went well and continue_more is set, we shouldn't actually get here if
2937 there are further addresses, as the return above will be taken. However,
2938 writing RSET might have failed, or there may be other addresses whose hosts are
2939 specified in the transports, and therefore not visible at top level, in which
2940 case continue_more won't get set. */
2941
2942 HDEBUG(D_transport|D_acl|D_v) debug_printf(" SMTP(close)>>\n");
2943 (void)close(inblock.sock);
2944
2945 #ifndef DISABLE_EVENT
2946 (void) event_raise(tblock->event_action, US"tcp:close", NULL);
2947 #endif
2948
2949 continue_transport = NULL;
2950 continue_hostname = NULL;
2951 return yield;
2952 }
2953
2954
2955
2956
2957 /*************************************************
2958 * Closedown entry point *
2959 *************************************************/
2960
2961 /* This function is called when exim is passed an open smtp channel
2962 from another incarnation, but the message which it has been asked
2963 to deliver no longer exists. The channel is on stdin.
2964
2965 We might do fancy things like looking for another message to send down
2966 the channel, but if the one we sought has gone, it has probably been
2967 delivered by some other process that itself will seek further messages,
2968 so just close down our connection.
2969
2970 Argument: pointer to the transport instance block
2971 Returns: nothing
2972 */
2973
2974 void
2975 smtp_transport_closedown(transport_instance *tblock)
2976 {
2977 smtp_transport_options_block *ob =
2978 (smtp_transport_options_block *)(tblock->options_block);
2979 smtp_inblock inblock;
2980 smtp_outblock outblock;
2981 uschar buffer[256];
2982 uschar inbuffer[4096];
2983 uschar outbuffer[16];
2984
2985 inblock.sock = fileno(stdin);
2986 inblock.buffer = inbuffer;
2987 inblock.buffersize = sizeof(inbuffer);
2988 inblock.ptr = inbuffer;
2989 inblock.ptrend = inbuffer;
2990
2991 outblock.sock = inblock.sock;
2992 outblock.buffersize = sizeof(outbuffer);
2993 outblock.buffer = outbuffer;
2994 outblock.ptr = outbuffer;
2995 outblock.cmd_count = 0;
2996 outblock.authenticating = FALSE;
2997
2998 (void)smtp_write_command(&outblock, FALSE, "QUIT\r\n");
2999 (void)smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
3000 ob->command_timeout);
3001 (void)close(inblock.sock);
3002 }
3003
3004
3005
3006 /*************************************************
3007 * Prepare addresses for delivery *
3008 *************************************************/
3009
3010 /* This function is called to flush out error settings from previous delivery
3011 attempts to other hosts. It also records whether we got here via an MX record
3012 or not in the more_errno field of the address. We are interested only in
3013 addresses that are still marked DEFER - others may have got delivered to a
3014 previously considered IP address. Set their status to PENDING_DEFER to indicate
3015 which ones are relevant this time.
3016
3017 Arguments:
3018 addrlist the list of addresses
3019 host the host we are delivering to
3020
3021 Returns: the first address for this delivery
3022 */
3023
3024 static address_item *
3025 prepare_addresses(address_item *addrlist, host_item *host)
3026 {
3027 address_item *first_addr = NULL;
3028 address_item *addr;
3029 for (addr = addrlist; addr != NULL; addr = addr->next)
3030 if (addr->transport_return == DEFER)
3031 {
3032 if (first_addr == NULL) first_addr = addr;
3033 addr->transport_return = PENDING_DEFER;
3034 addr->basic_errno = 0;
3035 addr->more_errno = (host->mx >= 0)? 'M' : 'A';
3036 addr->message = NULL;
3037 #ifdef SUPPORT_TLS
3038 addr->cipher = NULL;
3039 addr->ourcert = NULL;
3040 addr->peercert = NULL;
3041 addr->peerdn = NULL;
3042 addr->ocsp = OCSP_NOT_REQ;
3043 #endif
3044 #ifdef EXPERIMENTAL_DSN_INFO
3045 addr->smtp_greeting = NULL;
3046 addr->helo_response = NULL;
3047 #endif
3048 }
3049 return first_addr;
3050 }
3051
3052
3053
3054 /*************************************************
3055 * Main entry point *
3056 *************************************************/
3057
3058 /* See local README for interface details. As this is a remote transport, it is
3059 given a chain of addresses to be delivered in one connection, if possible. It
3060 always returns TRUE, indicating that each address has its own independent
3061 status set, except if there is a setting up problem, in which case it returns
3062 FALSE. */
3063
3064 BOOL
3065 smtp_transport_entry(
3066 transport_instance *tblock, /* data for this instantiation */
3067 address_item *addrlist) /* addresses we are working on */
3068 {
3069 int cutoff_retry;
3070 int port;
3071 int hosts_defer = 0;
3072 int hosts_fail = 0;
3073 int hosts_looked_up = 0;
3074 int hosts_retry = 0;
3075 int hosts_serial = 0;
3076 int hosts_total = 0;
3077 int total_hosts_tried = 0;
3078 address_item *addr;
3079 BOOL expired = TRUE;
3080 BOOL continuing = continue_hostname != NULL;
3081 uschar *expanded_hosts = NULL;
3082 uschar *pistring;
3083 uschar *tid = string_sprintf("%s transport", tblock->name);
3084 smtp_transport_options_block *ob =
3085 (smtp_transport_options_block *)(tblock->options_block);
3086 host_item *hostlist = addrlist->host_list;
3087 host_item *host = NULL;
3088
3089 DEBUG(D_transport)
3090 {
3091 debug_printf("%s transport entered\n", tblock->name);
3092 for (addr = addrlist; addr != NULL; addr = addr->next)
3093 debug_printf(" %s\n", addr->address);
3094 if (continuing) debug_printf("already connected to %s [%s]\n",
3095 continue_hostname, continue_host_address);
3096 }
3097
3098 /* Set the flag requesting that these hosts be added to the waiting
3099 database if the delivery fails temporarily or if we are running with
3100 queue_smtp or a 2-stage queue run. This gets unset for certain
3101 kinds of error, typically those that are specific to the message. */
3102
3103 update_waiting = TRUE;
3104
3105 /* If a host list is not defined for the addresses - they must all have the
3106 same one in order to be passed to a single transport - or if the transport has
3107 a host list with hosts_override set, use the host list supplied with the
3108 transport. It is an error for this not to exist. */
3109
3110 if (hostlist == NULL || (ob->hosts_override && ob->hosts != NULL))
3111 {
3112 if (ob->hosts == NULL)
3113 {
3114 addrlist->message = string_sprintf("%s transport called with no hosts set",
3115 tblock->name);
3116 addrlist->transport_return = PANIC;
3117 return FALSE; /* Only top address has status */
3118 }
3119
3120 DEBUG(D_transport) debug_printf("using the transport's hosts: %s\n",
3121 ob->hosts);
3122
3123 /* If the transport's host list contains no '$' characters, and we are not
3124 randomizing, it is fixed and therefore a chain of hosts can be built once
3125 and for all, and remembered for subsequent use by other calls to this
3126 transport. If, on the other hand, the host list does contain '$', or we are
3127 randomizing its order, we have to rebuild it each time. In the fixed case,
3128 as the hosts string will never be used again, it doesn't matter that we
3129 replace all the : characters with zeros. */
3130
3131 if (ob->hostlist == NULL)
3132 {
3133 uschar *s = ob->hosts;
3134
3135 if (Ustrchr(s, '$') != NULL)
3136 {
3137 if (!(expanded_hosts = expand_string(s)))
3138 {
3139 addrlist->message = string_sprintf("failed to expand list of hosts "
3140 "\"%s\" in %s transport: %s", s, tblock->name, expand_string_message);
3141 addrlist->transport_return = search_find_defer? DEFER : PANIC;
3142 return FALSE; /* Only top address has status */
3143 }
3144 DEBUG(D_transport) debug_printf("expanded list of hosts \"%s\" to "
3145 "\"%s\"\n", s, expanded_hosts);
3146 s = expanded_hosts;
3147 }
3148 else
3149 if (ob->hosts_randomize) s = expanded_hosts = string_copy(s);
3150
3151 host_build_hostlist(&hostlist, s, ob->hosts_randomize);
3152
3153 /* Check that the expansion yielded something useful. */
3154 if (hostlist == NULL)
3155 {
3156 addrlist->message =
3157 string_sprintf("%s transport has empty hosts setting", tblock->name);
3158 addrlist->transport_return = PANIC;
3159 return FALSE; /* Only top address has status */
3160 }
3161
3162 /* If there was no expansion of hosts, save the host list for
3163 next time. */
3164
3165 if (!expanded_hosts) ob->hostlist = hostlist;
3166 }
3167
3168 /* This is not the first time this transport has been run in this delivery;
3169 the host list was built previously. */
3170
3171 else
3172 hostlist = ob->hostlist;
3173 }
3174
3175 /* The host list was supplied with the address. If hosts_randomize is set, we
3176 must sort it into a random order if it did not come from MX records and has not
3177 already been randomized (but don't bother if continuing down an existing
3178 connection). */
3179
3180 else if (ob->hosts_randomize && hostlist->mx == MX_NONE && !continuing)
3181 {
3182 host_item *newlist = NULL;
3183 while (hostlist != NULL)
3184 {
3185 host_item *h = hostlist;
3186 hostlist = hostlist->next;
3187
3188 h->sort_key = random_number(100);
3189
3190 if (newlist == NULL)
3191 {
3192 h->next = NULL;
3193 newlist = h;
3194 }
3195 else if (h->sort_key < newlist->sort_key)
3196 {
3197 h->next = newlist;
3198 newlist = h;
3199 }
3200 else
3201 {
3202 host_item *hh = newlist;
3203 while (hh->next != NULL)
3204 {
3205 if (h->sort_key < hh->next->sort_key) break;
3206 hh = hh->next;
3207 }
3208 h->next = hh->next;
3209 hh->next = h;
3210 }
3211 }
3212
3213 hostlist = addrlist->host_list = newlist;
3214 }
3215
3216 /* Sort out the default port. */
3217
3218 if (!smtp_get_port(ob->port, addrlist, &port, tid)) return FALSE;
3219
3220 /* For each host-plus-IP-address on the list:
3221
3222 . If this is a continued delivery and the host isn't the one with the
3223 current connection, skip.
3224
3225 . If the status is unusable (i.e. previously failed or retry checked), skip.
3226
3227 . If no IP address set, get the address, either by turning the name into
3228 an address, calling gethostbyname if gethostbyname is on, or by calling
3229 the DNS. The DNS may yield multiple addresses, in which case insert the
3230 extra ones into the list.
3231
3232 . Get the retry data if not previously obtained for this address and set the
3233 field which remembers the state of this address. Skip if the retry time is
3234 not reached. If not, remember whether retry data was found. The retry string
3235 contains both the name and the IP address.
3236
3237 . Scan the list of addresses and mark those whose status is DEFER as
3238 PENDING_DEFER. These are the only ones that will be processed in this cycle
3239 of the hosts loop.
3240
3241 . Make a delivery attempt - addresses marked PENDING_DEFER will be tried.
3242 Some addresses may be successfully delivered, others may fail, and yet
3243 others may get temporary errors and so get marked DEFER.
3244
3245 . The return from the delivery attempt is OK if a connection was made and a
3246 valid SMTP dialogue was completed. Otherwise it is DEFER.
3247
3248 . If OK, add a "remove" retry item for this host/IPaddress, if any.
3249
3250 . If fail to connect, or other defer state, add a retry item.
3251
3252 . If there are any addresses whose status is still DEFER, carry on to the
3253 next host/IPaddress, unless we have tried the number of hosts given
3254 by hosts_max_try or hosts_max_try_hardlimit; otherwise return. Note that
3255 there is some fancy logic for hosts_max_try that means its limit can be
3256 overstepped in some circumstances.
3257
3258 If we get to the end of the list, all hosts have deferred at least one address,
3259 or not reached their retry times. If delay_after_cutoff is unset, it requests a
3260 delivery attempt to those hosts whose last try was before the arrival time of
3261 the current message. To cope with this, we have to go round the loop a second
3262 time. After that, set the status and error data for any addresses that haven't
3263 had it set already. */
3264
3265 for (cutoff_retry = 0; expired &&
3266 cutoff_retry < ((ob->delay_after_cutoff)? 1 : 2);
3267 cutoff_retry++)
3268 {
3269 host_item *nexthost = NULL;
3270 int unexpired_hosts_tried = 0;
3271
3272 for (host = hostlist;
3273 host != NULL &&
3274 unexpired_hosts_tried < ob->hosts_max_try &&
3275 total_hosts_tried < ob->hosts_max_try_hardlimit;
3276 host = nexthost)
3277 {
3278 int rc;
3279 int host_af;
3280 uschar *rs;
3281 BOOL serialized = FALSE;
3282 BOOL host_is_expired = FALSE;
3283 BOOL message_defer = FALSE;
3284 BOOL some_deferred = FALSE;
3285 address_item *first_addr = NULL;
3286 uschar *interface = NULL;
3287 uschar *retry_host_key = NULL;
3288 uschar *retry_message_key = NULL;
3289 uschar *serialize_key = NULL;
3290
3291 /* Default next host is next host. :-) But this can vary if the
3292 hosts_max_try limit is hit (see below). It may also be reset if a host
3293 address is looked up here (in case the host was multihomed). */
3294
3295 nexthost = host->next;
3296
3297 /* If the address hasn't yet been obtained from the host name, look it up
3298 now, unless the host is already marked as unusable. If it is marked as
3299 unusable, it means that the router was unable to find its IP address (in
3300 the DNS or wherever) OR we are in the 2nd time round the cutoff loop, and
3301 the lookup failed last time. We don't get this far if *all* MX records
3302 point to non-existent hosts; that is treated as a hard error.
3303
3304 We can just skip this host entirely. When the hosts came from the router,
3305 the address will timeout based on the other host(s); when the address is
3306 looked up below, there is an explicit retry record added.
3307
3308 Note that we mustn't skip unusable hosts if the address is not unset; they
3309 may be needed as expired hosts on the 2nd time round the cutoff loop. */
3310
3311 if (host->address == NULL)
3312 {
3313 int new_port, flags;
3314 host_item *hh;
3315
3316 if (host->status >= hstatus_unusable)
3317 {
3318 DEBUG(D_transport) debug_printf("%s has no address and is unusable - skipping\n",
3319 host->name);
3320 continue;
3321 }
3322
3323 DEBUG(D_transport) debug_printf("getting address for %s\n", host->name);
3324
3325 /* The host name is permitted to have an attached port. Find it, and
3326 strip it from the name. Just remember it for now. */
3327
3328 new_port = host_item_get_port(host);
3329
3330 /* Count hosts looked up */
3331
3332 hosts_looked_up++;
3333
3334 /* Find by name if so configured, or if it's an IP address. We don't
3335 just copy the IP address, because we need the test-for-local to happen. */
3336
3337 flags = HOST_FIND_BY_A;
3338 if (ob->dns_qualify_single) flags |= HOST_FIND_QUALIFY_SINGLE;
3339 if (ob->dns_search_parents) flags |= HOST_FIND_SEARCH_PARENTS;
3340
3341 if (ob->gethostbyname || string_is_ip_address(host->name, NULL) != 0)
3342 rc = host_find_byname(host, NULL, flags, NULL, TRUE);
3343 else
3344 rc = host_find_bydns(host, NULL, flags, NULL, NULL, NULL,
3345 &ob->dnssec, /* domains for request/require */
3346 NULL, NULL);
3347
3348 /* Update the host (and any additional blocks, resulting from
3349 multihoming) with a host-specific port, if any. */
3350
3351 for (hh = host; hh != nexthost; hh = hh->next) hh->port = new_port;
3352
3353 /* Failure to find the host at this time (usually DNS temporary failure)
3354 is really a kind of routing failure rather than a transport failure.
3355 Therefore we add a retry item of the routing kind, not to stop us trying
3356 to look this name up here again, but to ensure the address gets timed
3357 out if the failures go on long enough. A complete failure at this point
3358 commonly points to a configuration error, but the best action is still
3359 to carry on for the next host. */
3360
3361 if (rc == HOST_FIND_AGAIN || rc == HOST_FIND_FAILED)
3362 {
3363 retry_add_item(addrlist, string_sprintf("R:%s", host->name), 0);
3364 expired = FALSE;
3365 if (rc == HOST_FIND_AGAIN) hosts_defer++; else hosts_fail++;
3366 DEBUG(D_transport) debug_printf("rc = %s for %s\n", (rc == HOST_FIND_AGAIN)?
3367 "HOST_FIND_AGAIN" : "HOST_FIND_FAILED", host->name);
3368 host->status = hstatus_unusable;
3369
3370 for (addr = addrlist; addr != NULL; addr = addr->next)
3371 {
3372 if (addr->transport_return != DEFER) continue;
3373 addr->basic_errno = ERRNO_UNKNOWNHOST;
3374 addr->message =
3375 string_sprintf("failed to lookup IP address for %s", host->name);
3376 }
3377 continue;
3378 }
3379
3380 /* If the host is actually the local host, we may have a problem, or
3381 there may be some cunning configuration going on. In the problem case,
3382 log things and give up. The default transport status is already DEFER. */
3383
3384 if (rc == HOST_FOUND_LOCAL && !ob->allow_localhost)
3385 {
3386 for (addr = addrlist; addr != NULL; addr = addr->next)
3387 {
3388 addr->basic_errno = 0;
3389 addr->message = string_sprintf("%s transport found host %s to be "
3390 "local", tblock->name, host->name);
3391 }
3392 goto END_TRANSPORT;
3393 }
3394 } /* End of block for IP address lookup */
3395
3396 /* If this is a continued delivery, we are interested only in the host
3397 which matches the name of the existing open channel. The check is put
3398 here after the local host lookup, in case the name gets expanded as a
3399 result of the lookup. Set expired FALSE, to save the outer loop executing
3400 twice. */
3401
3402 if (continuing && (Ustrcmp(continue_hostname, host->name) != 0 ||
3403 Ustrcmp(continue_host_address, host->address) != 0))
3404 {
3405 expired = FALSE;
3406 continue; /* With next host */
3407 }
3408
3409 /* Reset the default next host in case a multihomed host whose addresses
3410 are not looked up till just above added to the host list. */
3411
3412 nexthost = host->next;
3413
3414 /* If queue_smtp is set (-odqs or the first part of a 2-stage run), or the
3415 domain is in queue_smtp_domains, we don't actually want to attempt any
3416 deliveries. When doing a queue run, queue_smtp_domains is always unset. If
3417 there is a lookup defer in queue_smtp_domains, proceed as if the domain
3418 were not in it. We don't want to hold up all SMTP deliveries! Except when
3419 doing a two-stage queue run, don't do this if forcing. */
3420
3421 if ((!deliver_force || queue_2stage) && (queue_smtp ||
3422 match_isinlist(addrlist->domain,
3423 (const uschar **)&queue_smtp_domains, 0,
3424 &domainlist_anchor, NULL, MCL_DOMAIN, TRUE, NULL) == OK))
3425 {
3426 expired = FALSE;
3427 for (addr = addrlist; addr != NULL; addr = addr->next)
3428 {
3429 if (addr->transport_return != DEFER) continue;
3430 addr->message = US"domain matches queue_smtp_domains, or -odqs set";
3431 }
3432 continue; /* With next host */
3433 }
3434
3435 /* Count hosts being considered - purely for an intelligent comment
3436 if none are usable. */
3437
3438 hosts_total++;
3439
3440 /* Set $host and $host address now in case they are needed for the
3441 interface expansion or the serialize_hosts check; they remain set if an
3442 actual delivery happens. */
3443
3444 deliver_host = host->name;
3445 deliver_host_address = host->address;
3446 lookup_dnssec_authenticated = host->dnssec == DS_YES ? US"yes"
3447 : host->dnssec == DS_NO ? US"no"
3448 : US"";
3449
3450 /* Set up a string for adding to the retry key if the port number is not
3451 the standard SMTP port. A host may have its own port setting that overrides
3452 the default. */
3453
3454 pistring = string_sprintf(":%d", (host->port == PORT_NONE)?
3455 port : host->port);
3456 if (Ustrcmp(pistring, ":25") == 0) pistring = US"";
3457
3458 /* Select IPv4 or IPv6, and choose an outgoing interface. If the interface
3459 string is set, even if constant (as different transports can have different
3460 constant settings), we must add it to the key that is used for retries,
3461 because connections to the same host from a different interface should be
3462 treated separately. */
3463
3464 host_af = (Ustrchr(host->address, ':') == NULL)? AF_INET : AF_INET6;
3465 if ((rs = ob->interface) && *rs)
3466 {
3467 if (!smtp_get_interface(rs, host_af, addrlist, &interface, tid))
3468 return FALSE;
3469 pistring = string_sprintf("%s/%s", pistring, interface);
3470 }
3471
3472 /* The first time round the outer loop, check the status of the host by
3473 inspecting the retry data. The second time round, we are interested only
3474 in expired hosts that haven't been tried since this message arrived. */
3475
3476 if (cutoff_retry == 0)
3477 {
3478 BOOL incl_ip;
3479 /* Ensure the status of the address is set by checking retry data if
3480 necessary. There may be host-specific retry data (applicable to all
3481 messages) and also data for retries of a specific message at this host.
3482 If either of these retry records are actually read, the keys used are
3483 returned to save recomputing them later. */
3484
3485 if (exp_bool(addrlist, US"transport", tblock->name, D_transport,
3486 US"retry_include_ip_address", ob->retry_include_ip_address,
3487 ob->expand_retry_include_ip_address, &incl_ip) != OK)
3488 continue; /* with next host */
3489
3490 host_is_expired = retry_check_address(addrlist->domain, host, pistring,
3491 incl_ip, &retry_host_key, &retry_message_key);
3492
3493 DEBUG(D_transport) debug_printf("%s [%s]%s status = %s\n", host->name,
3494 (host->address == NULL)? US"" : host->address, pistring,
3495 (host->status == hstatus_usable)? "usable" :
3496 (host->status == hstatus_unusable)? "unusable" :
3497 (host->status == hstatus_unusable_expired)? "unusable (expired)" : "?");
3498
3499 /* Skip this address if not usable at this time, noting if it wasn't
3500 actually expired, both locally and in the address. */
3501
3502 switch (host->status)
3503 {
3504 case hstatus_unusable:
3505 expired = FALSE;
3506 setflag(addrlist, af_retry_skipped);
3507 /* Fall through */
3508
3509 case hstatus_unusable_expired:
3510 switch (host->why)
3511 {
3512 case hwhy_retry: hosts_retry++; break;
3513 case hwhy_failed: hosts_fail++; break;
3514 case hwhy_deferred: hosts_defer++; break;
3515 }
3516
3517 /* If there was a retry message key, implying that previously there
3518 was a message-specific defer, we don't want to update the list of
3519 messages waiting for these hosts. */
3520
3521 if (retry_message_key != NULL) update_waiting = FALSE;
3522 continue; /* With the next host or IP address */
3523 }
3524 }
3525
3526 /* Second time round the loop: if the address is set but expired, and
3527 the message is newer than the last try, let it through. */
3528
3529 else
3530 {
3531 if (host->address == NULL ||
3532 host->status != hstatus_unusable_expired ||
3533 host->last_try > received_time)
3534 continue;
3535 DEBUG(D_transport)
3536 debug_printf("trying expired host %s [%s]%s\n",
3537 host->name, host->address, pistring);
3538 host_is_expired = TRUE;
3539 }
3540
3541 /* Setting "expired=FALSE" doesn't actually mean not all hosts are expired;
3542 it remains TRUE only if all hosts are expired and none are actually tried.
3543 */
3544
3545 expired = FALSE;
3546
3547 /* If this host is listed as one to which access must be serialized,
3548 see if another Exim process has a connection to it, and if so, skip
3549 this host. If not, update the database to record our connection to it
3550 and remember this for later deletion. Do not do any of this if we are
3551 sending the message down a pre-existing connection. */
3552
3553 if (!continuing &&
3554 verify_check_given_host(&ob->serialize_hosts, host) == OK)
3555 {
3556 serialize_key = string_sprintf("host-serialize-%s", host->name);
3557 if (!enq_start(serialize_key, 1))
3558 {
3559 DEBUG(D_transport)
3560 debug_printf("skipping host %s because another Exim process "
3561 "is connected to it\n", host->name);
3562 hosts_serial++;
3563 continue;
3564 }
3565 serialized = TRUE;
3566 }
3567
3568 /* OK, we have an IP address that is not waiting for its retry time to
3569 arrive (it might be expired) OR (second time round the loop) we have an
3570 expired host that hasn't been tried since the message arrived. Have a go
3571 at delivering the message to it. First prepare the addresses by flushing
3572 out the result of previous attempts, and finding the first address that
3573 is still to be delivered. */
3574
3575 first_addr = prepare_addresses(addrlist, host);
3576
3577 DEBUG(D_transport) debug_printf("delivering %s to %s [%s] (%s%s)\n",
3578 message_id, host->name, host->address, addrlist->address,
3579 (addrlist->next == NULL)? "" : ", ...");
3580
3581 set_process_info("delivering %s to %s [%s] (%s%s)",
3582 message_id, host->name, host->address, addrlist->address,
3583 (addrlist->next == NULL)? "" : ", ...");
3584
3585 /* This is not for real; don't do the delivery. If there are
3586 any remaining hosts, list them. */
3587
3588 if (dont_deliver)
3589 {
3590 host_item *host2;
3591 set_errno_nohost(addrlist, 0, NULL, OK, FALSE);
3592 for (addr = addrlist; addr != NULL; addr = addr->next)
3593 {
3594 addr->host_used = host;
3595 addr->special_action = '*';
3596 addr->message = US"delivery bypassed by -N option";
3597 }
3598 DEBUG(D_transport)
3599 {
3600 debug_printf("*** delivery by %s transport bypassed by -N option\n"
3601 "*** host and remaining hosts:\n", tblock->name);
3602 for (host2 = host; host2 != NULL; host2 = host2->next)
3603 debug_printf(" %s [%s]\n", host2->name,
3604 (host2->address == NULL)? US"unset" : host2->address);
3605 }
3606 rc = OK;
3607 }
3608
3609 /* This is for real. If the host is expired, we don't count it for
3610 hosts_max_retry. This ensures that all hosts must expire before an address
3611 is timed out, unless hosts_max_try_hardlimit (which protects against
3612 lunatic DNS configurations) is reached.
3613
3614 If the host is not expired and we are about to hit the hosts_max_retry
3615 limit, check to see if there is a subsequent hosts with a different MX
3616 value. If so, make that the next host, and don't count this one. This is a
3617 heuristic to make sure that different MXs do get tried. With a normal kind
3618 of retry rule, they would get tried anyway when the earlier hosts were
3619 delayed, but if the domain has a "retry every time" type of rule - as is
3620 often used for the the very large ISPs, that won't happen. */
3621
3622 else
3623 {
3624 host_item * thost;
3625 /* Make a copy of the host if it is local to this invocation
3626 of the transport. */
3627
3628 if (expanded_hosts)
3629 {
3630 thost = store_get(sizeof(host_item));
3631 *thost = *host;
3632 thost->name = string_copy(host->name);
3633 thost->address = string_copy(host->address);
3634 }
3635 else
3636 thost = host;
3637
3638 if (!host_is_expired && ++unexpired_hosts_tried >= ob->hosts_max_try)
3639 {
3640 host_item *h;
3641 DEBUG(D_transport)
3642 debug_printf("hosts_max_try limit reached with this host\n");
3643 for (h = host; h; h = h->next) if (h->mx != host->mx)
3644 {
3645 nexthost = h;
3646 unexpired_hosts_tried--;
3647 DEBUG(D_transport) debug_printf("however, a higher MX host exists "
3648 "and will be tried\n");
3649 break;
3650 }
3651 }
3652
3653 /* Attempt the delivery. */
3654
3655 total_hosts_tried++;
3656 rc = smtp_deliver(addrlist, thost, host_af, port, interface, tblock,
3657 &message_defer, FALSE);
3658
3659 /* Yield is one of:
3660 OK => connection made, each address contains its result;
3661 message_defer is set for message-specific defers (when all
3662 recipients are marked defer)
3663 DEFER => there was a non-message-specific delivery problem;
3664 ERROR => there was a problem setting up the arguments for a filter,
3665 or there was a problem with expanding added headers
3666 */
3667
3668 /* If the result is not OK, there was a non-message-specific problem.
3669 If the result is DEFER, we need to write to the logs saying what happened
3670 for this particular host, except in the case of authentication and TLS
3671 failures, where the log has already been written. If all hosts defer a
3672 general message is written at the end. */
3673
3674 if (rc == DEFER && first_addr->basic_errno != ERRNO_AUTHFAIL &&
3675 first_addr->basic_errno != ERRNO_TLSFAILURE)
3676 write_logs(first_addr, host);
3677
3678 #ifndef DISABLE_EVENT
3679 if (rc == DEFER)
3680 deferred_event_raise(first_addr, host);
3681 #endif
3682
3683 /* If STARTTLS was accepted, but there was a failure in setting up the
3684 TLS session (usually a certificate screwup), and the host is not in
3685 hosts_require_tls, and tls_tempfail_tryclear is true, try again, with
3686 TLS forcibly turned off. We have to start from scratch with a new SMTP
3687 connection. That's why the retry is done from here, not from within
3688 smtp_deliver(). [Rejections of STARTTLS itself don't screw up the
3689 session, so the in-clear transmission after those errors, if permitted,
3690 happens inside smtp_deliver().] */
3691
3692 #ifdef SUPPORT_TLS
3693 if ( rc == DEFER
3694 && first_addr->basic_errno == ERRNO_TLSFAILURE
3695 && ob->tls_tempfail_tryclear
3696 && verify_check_given_host(&ob->hosts_require_tls, host) != OK
3697 )
3698 {
3699 log_write(0, LOG_MAIN, "TLS session failure: delivering unencrypted "
3700 "to %s [%s] (not in hosts_require_tls)", host->name, host->address);
3701 first_addr = prepare_addresses(addrlist, host);
3702 rc = smtp_deliver(addrlist, thost, host_af, port, interface, tblock,
3703 &message_defer, TRUE);
3704 if (rc == DEFER && first_addr->basic_errno != ERRNO_AUTHFAIL)
3705 write_logs(first_addr, host);
3706 # ifndef DISABLE_EVENT
3707 if (rc == DEFER)
3708 deferred_event_raise(first_addr, host);
3709 # endif
3710 }
3711 #endif /*SUPPORT_TLS*/
3712 }
3713
3714 /* Delivery attempt finished */
3715
3716 rs = (rc == OK)? US"OK" : (rc == DEFER)? US"DEFER" : (rc == ERROR)?
3717 US"ERROR" : US"?";
3718
3719 set_process_info("delivering %s: just tried %s [%s] for %s%s: result %s",
3720 message_id, host->name, host->address, addrlist->address,
3721 (addrlist->next == NULL)? "" : " (& others)", rs);
3722
3723 /* Release serialization if set up */
3724
3725 if (serialized) enq_end(serialize_key);
3726
3727 /* If the result is DEFER, or if a host retry record is known to exist, we
3728 need to add an item to the retry chain for updating the retry database
3729 at the end of delivery. We only need to add the item to the top address,
3730 of course. Also, if DEFER, we mark the IP address unusable so as to skip it
3731 for any other delivery attempts using the same address. (It is copied into
3732 the unusable tree at the outer level, so even if different address blocks
3733 contain the same address, it still won't get tried again.) */
3734
3735 if (rc == DEFER || retry_host_key != NULL)
3736 {
3737 int delete_flag = (rc != DEFER)? rf_delete : 0;
3738 if (retry_host_key == NULL)
3739 {
3740 BOOL incl_ip;
3741 if (exp_bool(addrlist, US"transport", tblock->name, D_transport,
3742 US"retry_include_ip_address", ob->retry_include_ip_address,
3743 ob->expand_retry_include_ip_address, &incl_ip) != OK)
3744 incl_ip = TRUE; /* error; use most-specific retry record */
3745
3746 retry_host_key = incl_ip ?
3747 string_sprintf("T:%S:%s%s", host->name, host->address, pistring) :
3748 string_sprintf("T:%S%s", host->name, pistring);
3749 }
3750
3751 /* If a delivery of another message over an existing SMTP connection
3752 yields DEFER, we do NOT set up retry data for the host. This covers the
3753 case when there are delays in routing the addresses in the second message
3754 that are so long that the server times out. This is alleviated by not
3755 routing addresses that previously had routing defers when handling an
3756 existing connection, but even so, this case may occur (e.g. if a
3757 previously happily routed address starts giving routing defers). If the
3758 host is genuinely down, another non-continued message delivery will
3759 notice it soon enough. */
3760
3761 if (delete_flag != 0 || !continuing)
3762 retry_add_item(first_addr, retry_host_key, rf_host | delete_flag);
3763
3764 /* We may have tried an expired host, if its retry time has come; ensure
3765 the status reflects the expiry for the benefit of any other addresses. */
3766
3767 if (rc == DEFER)
3768 {
3769 host->status = (host_is_expired)?
3770 hstatus_unusable_expired : hstatus_unusable;
3771 host->why = hwhy_deferred;
3772 }
3773 }
3774
3775 /* If message_defer is set (host was OK, but every recipient got deferred
3776 because of some message-specific problem), or if that had happened
3777 previously so that a message retry key exists, add an appropriate item
3778 to the retry chain. Note that if there was a message defer but now there is
3779 a host defer, the message defer record gets deleted. That seems perfectly
3780 reasonable. Also, stop the message from being remembered as waiting
3781 for specific hosts. */
3782
3783 if (message_defer || retry_message_key != NULL)
3784 {
3785 int delete_flag = message_defer? 0 : rf_delete;
3786 if (retry_message_key == NULL)
3787 {
3788 BOOL incl_ip;
3789 if (exp_bool(addrlist, US"transport", tblock->name, D_transport,
3790 US"retry_include_ip_address", ob->retry_include_ip_address,
3791 ob->expand_retry_include_ip_address, &incl_ip) != OK)
3792 incl_ip = TRUE; /* error; use most-specific retry record */
3793
3794 retry_message_key = incl_ip ?
3795 string_sprintf("T:%S:%s%s:%s", host->name, host->address, pistring,
3796 message_id) :
3797 string_sprintf("T:%S%s:%s", host->name, pistring, message_id);
3798 }
3799 retry_add_item(addrlist, retry_message_key,
3800 rf_message | rf_host | delete_flag);
3801 update_waiting = FALSE;
3802 }
3803
3804 /* Any return other than DEFER (that is, OK or ERROR) means that the
3805 addresses have got their final statuses filled in for this host. In the OK
3806 case, see if any of them are deferred. */
3807
3808 if (rc == OK)
3809 for (addr = addrlist; addr; addr = addr->next)
3810 if (addr->transport_return == DEFER)
3811 {
3812 some_deferred = TRUE;
3813 break;
3814 }
3815
3816 /* If no addresses deferred or the result was ERROR, return. We do this for
3817 ERROR because a failing filter set-up or add_headers expansion is likely to
3818 fail for any host we try. */
3819
3820 if (rc == ERROR || (rc == OK && !some_deferred))
3821 {
3822 DEBUG(D_transport) debug_printf("Leaving %s transport\n", tblock->name);
3823 return TRUE; /* Each address has its status */
3824 }
3825
3826 /* If the result was DEFER or some individual addresses deferred, let
3827 the loop run to try other hosts with the deferred addresses, except for the
3828 case when we were trying to deliver down an existing channel and failed.
3829 Don't try any other hosts in this case. */
3830
3831 if (continuing) break;
3832
3833 /* If the whole delivery, or some individual addresses, were deferred and
3834 there are more hosts that could be tried, do not count this host towards
3835 the hosts_max_try limit if the age of the message is greater than the
3836 maximum retry time for this host. This means we may try try all hosts,
3837 ignoring the limit, when messages have been around for some time. This is
3838 important because if we don't try all hosts, the address will never time
3839 out. NOTE: this does not apply to hosts_max_try_hardlimit. */
3840
3841 if ((rc == DEFER || some_deferred) && nexthost != NULL)
3842 {
3843 BOOL timedout;
3844 retry_config *retry = retry_find_config(host->name, NULL, 0, 0);
3845
3846 if (retry != NULL && retry->rules != NULL)
3847 {
3848 retry_rule *last_rule;
3849 for (last_rule = retry->rules;
3850 last_rule->next != NULL;
3851 last_rule = last_rule->next);
3852 timedout = time(NULL) - received_time > last_rule->timeout;
3853 }
3854 else timedout = TRUE; /* No rule => timed out */
3855
3856 if (timedout)
3857 {
3858 unexpired_hosts_tried--;
3859 DEBUG(D_transport) debug_printf("temporary delivery error(s) override "
3860 "hosts_max_try (message older than host's retry time)\n");
3861 }
3862 }
3863 } /* End of loop for trying multiple hosts. */
3864
3865 /* This is the end of the loop that repeats iff expired is TRUE and
3866 ob->delay_after_cutoff is FALSE. The second time round we will
3867 try those hosts that haven't been tried since the message arrived. */
3868
3869 DEBUG(D_transport)
3870 {
3871 debug_printf("all IP addresses skipped or deferred at least one address\n");
3872 if (expired && !ob->delay_after_cutoff && cutoff_retry == 0)
3873 debug_printf("retrying IP addresses not tried since message arrived\n");
3874 }
3875 }
3876
3877
3878 /* Get here if all IP addresses are skipped or defer at least one address. In
3879 MUA wrapper mode, this will happen only for connection or other non-message-
3880 specific failures. Force the delivery status for all addresses to FAIL. *