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Delivery: clarify error log line. Bug 1782
[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 #ifdef SUPPORT_TLS
76 /* These are no longer honoured, as of Exim 4.80; for now, we silently
77 ignore; 4.83 will warn, and a later-still release will remove
78 these options, so that using them becomes an error. */
79 { "gnutls_require_kx", opt_stringptr,
80 (void *)offsetof(smtp_transport_options_block, gnutls_require_kx) },
81 { "gnutls_require_mac", opt_stringptr,
82 (void *)offsetof(smtp_transport_options_block, gnutls_require_mac) },
83 { "gnutls_require_protocols", opt_stringptr,
84 (void *)offsetof(smtp_transport_options_block, gnutls_require_proto) },
85 #endif
86 { "helo_data", opt_stringptr,
87 (void *)offsetof(smtp_transport_options_block, helo_data) },
88 { "hosts", opt_stringptr,
89 (void *)offsetof(smtp_transport_options_block, hosts) },
90 { "hosts_avoid_esmtp", opt_stringptr,
91 (void *)offsetof(smtp_transport_options_block, hosts_avoid_esmtp) },
92 { "hosts_avoid_pipelining", opt_stringptr,
93 (void *)offsetof(smtp_transport_options_block, hosts_avoid_pipelining) },
94 #ifdef SUPPORT_TLS
95 { "hosts_avoid_tls", opt_stringptr,
96 (void *)offsetof(smtp_transport_options_block, hosts_avoid_tls) },
97 #endif
98 { "hosts_max_try", opt_int,
99 (void *)offsetof(smtp_transport_options_block, hosts_max_try) },
100 { "hosts_max_try_hardlimit", opt_int,
101 (void *)offsetof(smtp_transport_options_block, hosts_max_try_hardlimit) },
102 #ifdef SUPPORT_TLS
103 { "hosts_nopass_tls", opt_stringptr,
104 (void *)offsetof(smtp_transport_options_block, hosts_nopass_tls) },
105 #endif
106 { "hosts_override", opt_bool,
107 (void *)offsetof(smtp_transport_options_block, hosts_override) },
108 { "hosts_randomize", opt_bool,
109 (void *)offsetof(smtp_transport_options_block, hosts_randomize) },
110 #if defined(SUPPORT_TLS) && !defined(DISABLE_OCSP)
111 { "hosts_request_ocsp", opt_stringptr,
112 (void *)offsetof(smtp_transport_options_block, hosts_request_ocsp) },
113 #endif
114 { "hosts_require_auth", opt_stringptr,
115 (void *)offsetof(smtp_transport_options_block, hosts_require_auth) },
116 #ifdef SUPPORT_TLS
117 # ifdef EXPERIMENTAL_DANE
118 { "hosts_require_dane", opt_stringptr,
119 (void *)offsetof(smtp_transport_options_block, hosts_require_dane) },
120 # endif
121 # ifndef DISABLE_OCSP
122 { "hosts_require_ocsp", opt_stringptr,
123 (void *)offsetof(smtp_transport_options_block, hosts_require_ocsp) },
124 # endif
125 { "hosts_require_tls", opt_stringptr,
126 (void *)offsetof(smtp_transport_options_block, hosts_require_tls) },
127 #endif
128 { "hosts_try_auth", opt_stringptr,
129 (void *)offsetof(smtp_transport_options_block, hosts_try_auth) },
130 #if defined(SUPPORT_TLS) && defined(EXPERIMENTAL_DANE)
131 { "hosts_try_dane", opt_stringptr,
132 (void *)offsetof(smtp_transport_options_block, hosts_try_dane) },
133 #endif
134 #ifndef DISABLE_PRDR
135 { "hosts_try_prdr", opt_stringptr,
136 (void *)offsetof(smtp_transport_options_block, hosts_try_prdr) },
137 #endif
138 #ifdef SUPPORT_TLS
139 { "hosts_verify_avoid_tls", opt_stringptr,
140 (void *)offsetof(smtp_transport_options_block, hosts_verify_avoid_tls) },
141 #endif
142 { "interface", opt_stringptr,
143 (void *)offsetof(smtp_transport_options_block, interface) },
144 { "keepalive", opt_bool,
145 (void *)offsetof(smtp_transport_options_block, keepalive) },
146 { "lmtp_ignore_quota", opt_bool,
147 (void *)offsetof(smtp_transport_options_block, lmtp_ignore_quota) },
148 { "max_rcpt", opt_int | opt_public,
149 (void *)offsetof(transport_instance, max_addresses) },
150 { "multi_domain", opt_expand_bool | opt_public,
151 (void *)offsetof(transport_instance, multi_domain) },
152 { "port", opt_stringptr,
153 (void *)offsetof(smtp_transport_options_block, port) },
154 { "protocol", opt_stringptr,
155 (void *)offsetof(smtp_transport_options_block, protocol) },
156 { "retry_include_ip_address", opt_expand_bool,
157 (void *)offsetof(smtp_transport_options_block, retry_include_ip_address) },
158 { "serialize_hosts", opt_stringptr,
159 (void *)offsetof(smtp_transport_options_block, serialize_hosts) },
160 { "size_addition", opt_int,
161 (void *)offsetof(smtp_transport_options_block, size_addition) }
162 #ifdef SUPPORT_SOCKS
163 ,{ "socks_proxy", opt_stringptr,
164 (void *)offsetof(smtp_transport_options_block, socks_proxy) }
165 #endif
166 #ifdef SUPPORT_TLS
167 ,{ "tls_certificate", opt_stringptr,
168 (void *)offsetof(smtp_transport_options_block, tls_certificate) },
169 { "tls_crl", opt_stringptr,
170 (void *)offsetof(smtp_transport_options_block, tls_crl) },
171 { "tls_dh_min_bits", opt_int,
172 (void *)offsetof(smtp_transport_options_block, tls_dh_min_bits) },
173 { "tls_privatekey", opt_stringptr,
174 (void *)offsetof(smtp_transport_options_block, tls_privatekey) },
175 { "tls_require_ciphers", opt_stringptr,
176 (void *)offsetof(smtp_transport_options_block, tls_require_ciphers) },
177 { "tls_sni", opt_stringptr,
178 (void *)offsetof(smtp_transport_options_block, tls_sni) },
179 { "tls_tempfail_tryclear", opt_bool,
180 (void *)offsetof(smtp_transport_options_block, tls_tempfail_tryclear) },
181 { "tls_try_verify_hosts", opt_stringptr,
182 (void *)offsetof(smtp_transport_options_block, tls_try_verify_hosts) },
183 { "tls_verify_cert_hostnames", opt_stringptr,
184 (void *)offsetof(smtp_transport_options_block,tls_verify_cert_hostnames)},
185 { "tls_verify_certificates", opt_stringptr,
186 (void *)offsetof(smtp_transport_options_block, tls_verify_certificates) },
187 { "tls_verify_hosts", opt_stringptr,
188 (void *)offsetof(smtp_transport_options_block, tls_verify_hosts) }
189 #endif
190 };
191
192 /* Size of the options list. An extern variable has to be used so that its
193 address can appear in the tables drtables.c. */
194
195 int smtp_transport_options_count =
196 sizeof(smtp_transport_options)/sizeof(optionlist);
197
198 /* Default private options block for the smtp transport. */
199
200 smtp_transport_options_block smtp_transport_option_defaults = {
201 NULL, /* hosts */
202 NULL, /* fallback_hosts */
203 NULL, /* hostlist */
204 NULL, /* fallback_hostlist */
205 NULL, /* authenticated_sender */
206 US"$primary_hostname", /* helo_data */
207 NULL, /* interface */
208 NULL, /* port */
209 US"smtp", /* protocol */
210 NULL, /* DSCP */
211 NULL, /* serialize_hosts */
212 NULL, /* hosts_try_auth */
213 NULL, /* hosts_require_auth */
214 #ifdef EXPERIMENTAL_DANE
215 NULL, /* hosts_try_dane */
216 NULL, /* hosts_require_dane */
217 #endif
218 #ifndef DISABLE_PRDR
219 US"*", /* hosts_try_prdr */
220 #endif
221 #ifndef DISABLE_OCSP
222 US"*", /* hosts_request_ocsp (except under DANE; tls_client_start()) */
223 NULL, /* hosts_require_ocsp */
224 #endif
225 NULL, /* hosts_require_tls */
226 NULL, /* hosts_avoid_tls */
227 NULL, /* hosts_verify_avoid_tls */
228 NULL, /* hosts_avoid_pipelining */
229 NULL, /* hosts_avoid_esmtp */
230 NULL, /* hosts_nopass_tls */
231 5*60, /* command_timeout */
232 5*60, /* connect_timeout; shorter system default overrides */
233 5*60, /* data timeout */
234 10*60, /* final timeout */
235 1024, /* size_addition */
236 5, /* hosts_max_try */
237 50, /* hosts_max_try_hardlimit */
238 TRUE, /* address_retry_include_sender */
239 FALSE, /* allow_localhost */
240 FALSE, /* authenticated_sender_force */
241 FALSE, /* gethostbyname */
242 TRUE, /* dns_qualify_single */
243 FALSE, /* dns_search_parents */
244 { NULL, NULL }, /* dnssec_domains {request,require} */
245 TRUE, /* delay_after_cutoff */
246 FALSE, /* hosts_override */
247 FALSE, /* hosts_randomize */
248 TRUE, /* keepalive */
249 FALSE, /* lmtp_ignore_quota */
250 NULL, /* expand_retry_include_ip_address */
251 TRUE /* retry_include_ip_address */
252 #ifdef SUPPORT_SOCKS
253 ,NULL /* socks_proxy */
254 #endif
255 #ifdef SUPPORT_TLS
256 ,NULL, /* tls_certificate */
257 NULL, /* tls_crl */
258 NULL, /* tls_privatekey */
259 NULL, /* tls_require_ciphers */
260 NULL, /* gnutls_require_kx */
261 NULL, /* gnutls_require_mac */
262 NULL, /* gnutls_require_proto */
263 NULL, /* tls_sni */
264 US"system", /* tls_verify_certificates */
265 EXIM_CLIENT_DH_DEFAULT_MIN_BITS,
266 /* tls_dh_min_bits */
267 TRUE, /* tls_tempfail_tryclear */
268 NULL, /* tls_verify_hosts */
269 US"*", /* tls_try_verify_hosts */
270 US"*" /* tls_verify_cert_hostnames */
271 #endif
272 #ifndef DISABLE_DKIM
273 ,NULL, /* dkim_canon */
274 NULL, /* dkim_domain */
275 NULL, /* dkim_private_key */
276 NULL, /* dkim_selector */
277 NULL, /* dkim_sign_headers */
278 NULL /* dkim_strict */
279 #endif
280 };
281
282 /* some DSN flags for use later */
283
284 static int rf_list[] = {rf_notify_never, rf_notify_success,
285 rf_notify_failure, rf_notify_delay };
286
287 static uschar *rf_names[] = { US"NEVER", US"SUCCESS", US"FAILURE", US"DELAY" };
288
289
290
291 /* Local statics */
292
293 static uschar *smtp_command; /* Points to last cmd for error messages */
294 static uschar *mail_command; /* Points to MAIL cmd for error messages */
295 static BOOL update_waiting; /* TRUE to update the "wait" database */
296
297
298 /*************************************************
299 * Setup entry point *
300 *************************************************/
301
302 /* This function is called when the transport is about to be used,
303 but before running it in a sub-process. It is used for two things:
304
305 (1) To set the fallback host list in addresses, when delivering.
306 (2) To pass back the interface, port, protocol, and other options, for use
307 during callout verification.
308
309 Arguments:
310 tblock pointer to the transport instance block
311 addrlist list of addresses about to be transported
312 tf if not NULL, pointer to block in which to return options
313 uid the uid that will be set (not used)
314 gid the gid that will be set (not used)
315 errmsg place for error message (not used)
316
317 Returns: OK always (FAIL, DEFER not used)
318 */
319
320 static int
321 smtp_transport_setup(transport_instance *tblock, address_item *addrlist,
322 transport_feedback *tf, uid_t uid, gid_t gid, uschar **errmsg)
323 {
324 smtp_transport_options_block *ob =
325 (smtp_transport_options_block *)(tblock->options_block);
326
327 errmsg = errmsg; /* Keep picky compilers happy */
328 uid = uid;
329 gid = gid;
330
331 /* Pass back options if required. This interface is getting very messy. */
332
333 if (tf != NULL)
334 {
335 tf->interface = ob->interface;
336 tf->port = ob->port;
337 tf->protocol = ob->protocol;
338 tf->hosts = ob->hosts;
339 tf->hosts_override = ob->hosts_override;
340 tf->hosts_randomize = ob->hosts_randomize;
341 tf->gethostbyname = ob->gethostbyname;
342 tf->qualify_single = ob->dns_qualify_single;
343 tf->search_parents = ob->dns_search_parents;
344 tf->helo_data = ob->helo_data;
345 }
346
347 /* Set the fallback host list for all the addresses that don't have fallback
348 host lists, provided that the local host wasn't present in the original host
349 list. */
350
351 if (!testflag(addrlist, af_local_host_removed))
352 {
353 for (; addrlist != NULL; addrlist = addrlist->next)
354 if (addrlist->fallback_hosts == NULL)
355 addrlist->fallback_hosts = ob->fallback_hostlist;
356 }
357
358 return OK;
359 }
360
361
362
363 /*************************************************
364 * Initialization entry point *
365 *************************************************/
366
367 /* Called for each instance, after its options have been read, to
368 enable consistency checks to be done, or anything else that needs
369 to be set up.
370
371 Argument: pointer to the transport instance block
372 Returns: nothing
373 */
374
375 void
376 smtp_transport_init(transport_instance *tblock)
377 {
378 smtp_transport_options_block *ob =
379 (smtp_transport_options_block *)(tblock->options_block);
380
381 /* Retry_use_local_part defaults FALSE if unset */
382
383 if (tblock->retry_use_local_part == TRUE_UNSET)
384 tblock->retry_use_local_part = FALSE;
385
386 /* Set the default port according to the protocol */
387
388 if (ob->port == NULL)
389 ob->port = (strcmpic(ob->protocol, US"lmtp") == 0)? US"lmtp" :
390 (strcmpic(ob->protocol, US"smtps") == 0)? US"smtps" : US"smtp";
391
392 /* Set up the setup entry point, to be called before subprocesses for this
393 transport. */
394
395 tblock->setup = smtp_transport_setup;
396
397 /* Complain if any of the timeouts are zero. */
398
399 if (ob->command_timeout <= 0 || ob->data_timeout <= 0 ||
400 ob->final_timeout <= 0)
401 log_write(0, LOG_PANIC_DIE|LOG_CONFIG,
402 "command, data, or final timeout value is zero for %s transport",
403 tblock->name);
404
405 /* If hosts_override is set and there are local hosts, set the global
406 flag that stops verify from showing router hosts. */
407
408 if (ob->hosts_override && ob->hosts != NULL) tblock->overrides_hosts = TRUE;
409
410 /* If there are any fallback hosts listed, build a chain of host items
411 for them, but do not do any lookups at this time. */
412
413 host_build_hostlist(&(ob->fallback_hostlist), ob->fallback_hosts, FALSE);
414
415 #ifdef SUPPORT_TLS
416 if ( ob->gnutls_require_kx
417 || ob->gnutls_require_mac
418 || ob->gnutls_require_proto)
419 log_write(0, LOG_MAIN, "WARNING: smtp transport options"
420 " gnutls_require_kx, gnutls_require_mac and gnutls_require_protocols"
421 " are obsolete\n");
422 #endif
423 }
424
425
426
427
428
429 /*************************************************
430 * Set delivery info into all active addresses *
431 *************************************************/
432
433 /* Only addresses whose status is >= PENDING are relevant. A lesser
434 status means that an address is not currently being processed.
435
436 Arguments:
437 addrlist points to a chain of addresses
438 errno_value to put in each address's errno field
439 msg to put in each address's message field
440 rc to put in each address's transport_return field
441 pass_message if TRUE, set the "pass message" flag in the address
442 host if set, mark addrs as having used this host
443 smtp_greeting from peer
444 helo_response from peer
445
446 If errno_value has the special value ERRNO_CONNECTTIMEOUT, ETIMEDOUT is put in
447 the errno field, and RTEF_CTOUT is ORed into the more_errno field, to indicate
448 this particular type of timeout.
449
450 Returns: nothing
451 */
452
453 static void
454 set_errno(address_item *addrlist, int errno_value, uschar *msg, int rc,
455 BOOL pass_message, host_item * host
456 #ifdef EXPERIMENTAL_DSN_INFO
457 , const uschar * smtp_greeting, const uschar * helo_response
458 #endif
459 )
460 {
461 address_item *addr;
462 int orvalue = 0;
463 if (errno_value == ERRNO_CONNECTTIMEOUT)
464 {
465 errno_value = ETIMEDOUT;
466 orvalue = RTEF_CTOUT;
467 }
468 for (addr = addrlist; addr; addr = addr->next)
469 if (addr->transport_return >= PENDING)
470 {
471 addr->basic_errno = errno_value;
472 addr->more_errno |= orvalue;
473 if (msg != NULL)
474 {
475 addr->message = msg;
476 if (pass_message) setflag(addr, af_pass_message);
477 }
478 addr->transport_return = rc;
479 if (host)
480 {
481 addr->host_used = host;
482 #ifdef EXPERIMENTAL_DSN_INFO
483 if (smtp_greeting)
484 {uschar * s = Ustrchr(smtp_greeting, '\n'); if (s) *s = '\0';}
485 addr->smtp_greeting = smtp_greeting;
486
487 if (helo_response)
488 {uschar * s = Ustrchr(helo_response, '\n'); if (s) *s = '\0';}
489 addr->helo_response = helo_response;
490 #endif
491 }
492 }
493 }
494
495 static void
496 set_errno_nohost(address_item *addrlist, int errno_value, uschar *msg, int rc,
497 BOOL pass_message)
498 {
499 set_errno(addrlist, errno_value, msg, rc, pass_message, NULL
500 #ifdef EXPERIMENTAL_DSN_INFO
501 , NULL, NULL
502 #endif
503 );
504 }
505
506
507 /*************************************************
508 * Check an SMTP response *
509 *************************************************/
510
511 /* This function is given an errno code and the SMTP response buffer
512 to analyse, together with the host identification for generating messages. It
513 sets an appropriate message and puts the first digit of the response code into
514 the yield variable. If no response was actually read, a suitable digit is
515 chosen.
516
517 Arguments:
518 host the current host, to get its name for messages
519 errno_value pointer to the errno value
520 more_errno from the top address for use with ERRNO_FILTER_FAIL
521 buffer the SMTP response buffer
522 yield where to put a one-digit SMTP response code
523 message where to put an errror message
524 pass_message set TRUE if message is an SMTP response
525
526 Returns: TRUE if an SMTP "QUIT" command should be sent, else FALSE
527 */
528
529 static BOOL
530 check_response(host_item *host, int *errno_value, int more_errno,
531 uschar *buffer, int *yield, uschar **message, BOOL *pass_message)
532 {
533 uschar *pl = US"";
534
535 if (smtp_use_pipelining &&
536 (Ustrcmp(smtp_command, "MAIL") == 0 ||
537 Ustrcmp(smtp_command, "RCPT") == 0 ||
538 Ustrcmp(smtp_command, "DATA") == 0))
539 pl = US"pipelined ";
540
541 *yield = '4'; /* Default setting is to give a temporary error */
542
543 /* Handle response timeout */
544
545 if (*errno_value == ETIMEDOUT)
546 {
547 *message = US string_sprintf("SMTP timeout after %s%s",
548 pl, smtp_command);
549 if (transport_count > 0)
550 *message = US string_sprintf("%s (%d bytes written)", *message,
551 transport_count);
552 return FALSE;
553 }
554
555 /* Handle malformed SMTP response */
556
557 if (*errno_value == ERRNO_SMTPFORMAT)
558 {
559 const uschar *malfresp = string_printing(buffer);
560 while (isspace(*malfresp)) malfresp++;
561 *message = *malfresp == 0
562 ? string_sprintf("Malformed SMTP reply (an empty line) "
563 "in response to %s%s", pl, smtp_command)
564 : string_sprintf("Malformed SMTP reply in response to %s%s: %s",
565 pl, smtp_command, malfresp);
566 return FALSE;
567 }
568
569 /* Handle a failed filter process error; can't send QUIT as we mustn't
570 end the DATA. */
571
572 if (*errno_value == ERRNO_FILTER_FAIL)
573 {
574 *message = US string_sprintf("transport filter process failed (%d)%s",
575 more_errno,
576 (more_errno == EX_EXECFAILED)? ": unable to execute command" : "");
577 return FALSE;
578 }
579
580 /* Handle a failed add_headers expansion; can't send QUIT as we mustn't
581 end the DATA. */
582
583 if (*errno_value == ERRNO_CHHEADER_FAIL)
584 {
585 *message =
586 US string_sprintf("failed to expand headers_add or headers_remove: %s",
587 expand_string_message);
588 return FALSE;
589 }
590
591 /* Handle failure to write a complete data block */
592
593 if (*errno_value == ERRNO_WRITEINCOMPLETE)
594 {
595 *message = US string_sprintf("failed to write a data block");
596 return FALSE;
597 }
598
599 #ifdef SUPPORT_I18N
600 /* Handle lack of advertised SMTPUTF8, for international message */
601 if (*errno_value == ERRNO_UTF8_FWD)
602 {
603 *message = US string_sprintf("utf8 support required but not offered for forwarding");
604 DEBUG(D_deliver|D_transport) debug_printf("%s\n", *message);
605 return TRUE;
606 }
607 #endif
608
609 /* Handle error responses from the remote mailer. */
610
611 if (buffer[0] != 0)
612 {
613 const uschar *s = string_printing(buffer);
614 *message = US string_sprintf("SMTP error from remote mail server after %s%s: "
615 "%s", pl, smtp_command, s);
616 *pass_message = TRUE;
617 *yield = buffer[0];
618 return TRUE;
619 }
620
621 /* No data was read. If there is no errno, this must be the EOF (i.e.
622 connection closed) case, which causes deferral. An explicit connection reset
623 error has the same effect. Otherwise, put the host's identity in the message,
624 leaving the errno value to be interpreted as well. In all cases, we have to
625 assume the connection is now dead. */
626
627 if (*errno_value == 0 || *errno_value == ECONNRESET)
628 {
629 *errno_value = ERRNO_SMTPCLOSED;
630 *message = US string_sprintf("Remote host closed connection "
631 "in response to %s%s", pl, smtp_command);
632 }
633 else *message = US string_sprintf("%s [%s]", host->name, host->address);
634
635 return FALSE;
636 }
637
638
639
640 /*************************************************
641 * Write error message to logs *
642 *************************************************/
643
644 /* This writes to the main log and to the message log.
645
646 Arguments:
647 addr the address item containing error information
648 host the current host
649
650 Returns: nothing
651 */
652
653 static void
654 write_logs(address_item *addr, host_item *host)
655 {
656 uschar * message = string_sprintf("H=%s [%s]", host->name, host->address);
657
658 if (LOGGING(outgoing_port))
659 message = string_sprintf("%s:%d", message,
660 host->port == PORT_NONE ? 25 : host->port);
661 if (addr->message)
662 {
663 message = string_sprintf("%s: %s", message, addr->message);
664 if (addr->basic_errno > 0)
665 message = string_sprintf("%s: %s", message, strerror(addr->basic_errno));
666 log_write(0, LOG_MAIN, "%s", message);
667 deliver_msglog("%s %s\n", tod_stamp(tod_log), message);
668 }
669 else
670 {
671 const uschar * s = exim_errstr(addr->basic_errno);
672 log_write(0, LOG_MAIN, "%s %s", message, s);
673 deliver_msglog("%s %s %s\n", tod_stamp(tod_log), message, s);
674 }
675 }
676
677 static void
678 msglog_line(host_item * host, uschar * message)
679 {
680 deliver_msglog("%s H=%s [%s] %s\n", tod_stamp(tod_log),
681 host->name, host->address, message);
682 }
683
684
685
686 #ifndef DISABLE_EVENT
687 /*************************************************
688 * Post-defer action *
689 *************************************************/
690
691 /* This expands an arbitrary per-transport string.
692 It might, for example, be used to write to the database log.
693
694 Arguments:
695 addr the address item containing error information
696 host the current host
697
698 Returns: nothing
699 */
700
701 static void
702 deferred_event_raise(address_item *addr, host_item *host)
703 {
704 uschar * action = addr->transport->event_action;
705 const uschar * save_domain;
706 uschar * save_local;
707
708 if (!action)
709 return;
710
711 save_domain = deliver_domain;
712 save_local = deliver_localpart;
713
714 /*XXX would ip & port already be set up? */
715 deliver_host_address = string_copy(host->address);
716 deliver_host_port = host->port == PORT_NONE ? 25 : host->port;
717 event_defer_errno = addr->basic_errno;
718
719 router_name = addr->router->name;
720 transport_name = addr->transport->name;
721 deliver_domain = addr->domain;
722 deliver_localpart = addr->local_part;
723
724 (void) event_raise(action, US"msg:host:defer",
725 addr->message
726 ? addr->basic_errno > 0
727 ? string_sprintf("%s: %s", addr->message, strerror(addr->basic_errno))
728 : string_copy(addr->message)
729 : addr->basic_errno > 0
730 ? string_copy(US strerror(addr->basic_errno))
731 : NULL);
732
733 deliver_localpart = save_local;
734 deliver_domain = save_domain;
735 router_name = transport_name = NULL;
736 }
737 #endif
738
739 /*************************************************
740 * Synchronize SMTP responses *
741 *************************************************/
742
743 /* This function is called from smtp_deliver() to receive SMTP responses from
744 the server, and match them up with the commands to which they relate. When
745 PIPELINING is not in use, this function is called after every command, and is
746 therefore somewhat over-engineered, but it is simpler to use a single scheme
747 that works both with and without PIPELINING instead of having two separate sets
748 of code.
749
750 The set of commands that are buffered up with pipelining may start with MAIL
751 and may end with DATA; in between are RCPT commands that correspond to the
752 addresses whose status is PENDING_DEFER. All other commands (STARTTLS, AUTH,
753 etc.) are never buffered.
754
755 Errors after MAIL or DATA abort the whole process leaving the response in the
756 buffer. After MAIL, pending responses are flushed, and the original command is
757 re-instated in big_buffer for error messages. For RCPT commands, the remote is
758 permitted to reject some recipient addresses while accepting others. However
759 certain errors clearly abort the whole process. Set the value in
760 transport_return to PENDING_OK if the address is accepted. If there is a
761 subsequent general error, it will get reset accordingly. If not, it will get
762 converted to OK at the end.
763
764 Arguments:
765 addrlist the complete address list
766 include_affixes TRUE if affixes include in RCPT
767 sync_addr ptr to the ptr of the one to start scanning at (updated)
768 host the host we are connected to
769 count the number of responses to read
770 address_retry_
771 include_sender true if 4xx retry is to include the sender it its key
772 pending_MAIL true if the first response is for MAIL
773 pending_DATA 0 if last command sent was not DATA
774 +1 if previously had a good recipient
775 -1 if not previously had a good recipient
776 inblock incoming SMTP block
777 timeout timeout value
778 buffer buffer for reading response
779 buffsize size of buffer
780
781 Returns: 3 if at least one address had 2xx and one had 5xx
782 2 if at least one address had 5xx but none had 2xx
783 1 if at least one host had a 2xx response, but none had 5xx
784 0 no address had 2xx or 5xx but no errors (all 4xx, or just DATA)
785 -1 timeout while reading RCPT response
786 -2 I/O or other non-response error for RCPT
787 -3 DATA or MAIL failed - errno and buffer set
788 */
789
790 static int
791 sync_responses(address_item *addrlist, BOOL include_affixes,
792 address_item **sync_addr, host_item *host, int count,
793 BOOL address_retry_include_sender, BOOL pending_MAIL,
794 int pending_DATA, smtp_inblock *inblock, int timeout, uschar *buffer,
795 int buffsize)
796 {
797 address_item *addr = *sync_addr;
798 int yield = 0;
799
800 /* Handle the response for a MAIL command. On error, reinstate the original
801 command in big_buffer for error message use, and flush any further pending
802 responses before returning, except after I/O errors and timeouts. */
803
804 if (pending_MAIL)
805 {
806 count--;
807 if (!smtp_read_response(inblock, buffer, buffsize, '2', timeout))
808 {
809 Ustrcpy(big_buffer, mail_command); /* Fits, because it came from there! */
810 if (errno == 0 && buffer[0] != 0)
811 {
812 uschar flushbuffer[4096];
813 int save_errno = 0;
814 if (buffer[0] == '4')
815 {
816 save_errno = ERRNO_MAIL4XX;
817 addr->more_errno |= ((buffer[1] - '0')*10 + buffer[2] - '0') << 8;
818 }
819 while (count-- > 0)
820 {
821 if (!smtp_read_response(inblock, flushbuffer, sizeof(flushbuffer),
822 '2', timeout)
823 && (errno != 0 || flushbuffer[0] == 0))
824 break;
825 }
826 errno = save_errno;
827 }
828
829 if (pending_DATA) count--; /* Number of RCPT responses to come */
830 while (count-- > 0) /* Mark any pending addrs with the host used */
831 {
832 while (addr->transport_return != PENDING_DEFER) addr = addr->next;
833 addr->host_used = host;
834 addr = addr->next;
835 }
836 return -3;
837 }
838 }
839
840 if (pending_DATA) count--; /* Number of RCPT responses to come */
841
842 /* Read and handle the required number of RCPT responses, matching each one up
843 with an address by scanning for the next address whose status is PENDING_DEFER.
844 */
845
846 while (count-- > 0)
847 {
848 while (addr->transport_return != PENDING_DEFER) addr = addr->next;
849
850 /* The address was accepted */
851 addr->host_used = host;
852
853 if (smtp_read_response(inblock, buffer, buffsize, '2', timeout))
854 {
855 yield |= 1;
856 addr->transport_return = PENDING_OK;
857
858 /* If af_dr_retry_exists is set, there was a routing delay on this address;
859 ensure that any address-specific retry record is expunged. We do this both
860 for the basic key and for the version that also includes the sender. */
861
862 if (testflag(addr, af_dr_retry_exists))
863 {
864 uschar *altkey = string_sprintf("%s:<%s>", addr->address_retry_key,
865 sender_address);
866 retry_add_item(addr, altkey, rf_delete);
867 retry_add_item(addr, addr->address_retry_key, rf_delete);
868 }
869 }
870
871 /* Timeout while reading the response */
872
873 else if (errno == ETIMEDOUT)
874 {
875 uschar *message = string_sprintf("SMTP timeout after RCPT TO:<%s>",
876 transport_rcpt_address(addr, include_affixes));
877 set_errno_nohost(addrlist, ETIMEDOUT, message, DEFER, FALSE);
878 retry_add_item(addr, addr->address_retry_key, 0);
879 update_waiting = FALSE;
880 return -1;
881 }
882
883 /* Handle other errors in obtaining an SMTP response by returning -1. This
884 will cause all the addresses to be deferred. Restore the SMTP command in
885 big_buffer for which we are checking the response, so the error message
886 makes sense. */
887
888 else if (errno != 0 || buffer[0] == 0)
889 {
890 string_format(big_buffer, big_buffer_size, "RCPT TO:<%s>",
891 transport_rcpt_address(addr, include_affixes));
892 return -2;
893 }
894
895 /* Handle SMTP permanent and temporary response codes. */
896
897 else
898 {
899 addr->message =
900 string_sprintf("SMTP error from remote mail server after RCPT TO:<%s>: "
901 "%s", transport_rcpt_address(addr, include_affixes),
902 string_printing(buffer));
903 setflag(addr, af_pass_message);
904 msglog_line(host, addr->message);
905
906 /* The response was 5xx */
907
908 if (buffer[0] == '5')
909 {
910 addr->transport_return = FAIL;
911 yield |= 2;
912 }
913
914 /* The response was 4xx */
915
916 else
917 {
918 addr->transport_return = DEFER;
919 addr->basic_errno = ERRNO_RCPT4XX;
920 addr->more_errno |= ((buffer[1] - '0')*10 + buffer[2] - '0') << 8;
921
922 #ifndef DISABLE_EVENT
923 event_defer_errno = addr->more_errno;
924 msg_event_raise(US"msg:rcpt:host:defer", addr);
925 #endif
926
927 /* Log temporary errors if there are more hosts to be tried.
928 If not, log this last one in the == line. */
929
930 if (host->next)
931 log_write(0, LOG_MAIN, "H=%s [%s]: %s", host->name, host->address, addr->message);
932
933 #ifndef DISABLE_EVENT
934 else
935 msg_event_raise(US"msg:rcpt:defer", addr);
936 #endif
937
938 /* Do not put this message on the list of those waiting for specific
939 hosts, as otherwise it is likely to be tried too often. */
940
941 update_waiting = FALSE;
942
943 /* Add a retry item for the address so that it doesn't get tried again
944 too soon. If address_retry_include_sender is true, add the sender address
945 to the retry key. */
946
947 if (address_retry_include_sender)
948 {
949 uschar *altkey = string_sprintf("%s:<%s>", addr->address_retry_key,
950 sender_address);
951 retry_add_item(addr, altkey, 0);
952 }
953 else retry_add_item(addr, addr->address_retry_key, 0);
954 }
955 }
956 } /* Loop for next RCPT response */
957
958 /* Update where to start at for the next block of responses, unless we
959 have already handled all the addresses. */
960
961 if (addr != NULL) *sync_addr = addr->next;
962
963 /* Handle a response to DATA. If we have not had any good recipients, either
964 previously or in this block, the response is ignored. */
965
966 if (pending_DATA != 0 &&
967 !smtp_read_response(inblock, buffer, buffsize, '3', timeout))
968 {
969 int code;
970 uschar *msg;
971 BOOL pass_message;
972 if (pending_DATA > 0 || (yield & 1) != 0)
973 {
974 if (errno == 0 && buffer[0] == '4')
975 {
976 errno = ERRNO_DATA4XX;
977 addrlist->more_errno |= ((buffer[1] - '0')*10 + buffer[2] - '0') << 8;
978 }
979 return -3;
980 }
981 (void)check_response(host, &errno, 0, buffer, &code, &msg, &pass_message);
982 DEBUG(D_transport) debug_printf("%s\nerror for DATA ignored: pipelining "
983 "is in use and there were no good recipients\n", msg);
984 }
985
986 /* All responses read and handled; MAIL (if present) received 2xx and DATA (if
987 present) received 3xx. If any RCPTs were handled and yielded anything other
988 than 4xx, yield will be set non-zero. */
989
990 return yield;
991 }
992
993
994
995 /* Do the client side of smtp-level authentication */
996 /*
997 Arguments:
998 buffer EHLO response from server (gets overwritten)
999 addrlist chain of potential addresses to deliver
1000 host host to deliver to
1001 ob transport options
1002 ibp, obp comms channel control blocks
1003
1004 Returns:
1005 OK Success, or failed (but not required): global "smtp_authenticated" set
1006 DEFER Failed authentication (and was required)
1007 ERROR Internal problem
1008
1009 FAIL_SEND Failed communications - transmit
1010 FAIL - response
1011 */
1012
1013 int
1014 smtp_auth(uschar *buffer, unsigned bufsize, address_item *addrlist, host_item *host,
1015 smtp_transport_options_block *ob, BOOL is_esmtp,
1016 smtp_inblock *ibp, smtp_outblock *obp)
1017 {
1018 int require_auth;
1019 uschar *fail_reason = US"server did not advertise AUTH support";
1020
1021 smtp_authenticated = FALSE;
1022 client_authenticator = client_authenticated_id = client_authenticated_sender = NULL;
1023 require_auth = verify_check_given_host(&ob->hosts_require_auth, host);
1024
1025 if (is_esmtp && !regex_AUTH) regex_AUTH =
1026 regex_must_compile(US"\\n250[\\s\\-]AUTH\\s+([\\-\\w\\s]+)(?:\\n|$)",
1027 FALSE, TRUE);
1028
1029 if (is_esmtp && regex_match_and_setup(regex_AUTH, buffer, 0, -1))
1030 {
1031 uschar *names = string_copyn(expand_nstring[1], expand_nlength[1]);
1032 expand_nmax = -1; /* reset */
1033
1034 /* Must not do this check until after we have saved the result of the
1035 regex match above. */
1036
1037 if (require_auth == OK ||
1038 verify_check_given_host(&ob->hosts_try_auth, host) == OK)
1039 {
1040 auth_instance *au;
1041 fail_reason = US"no common mechanisms were found";
1042
1043 DEBUG(D_transport) debug_printf("scanning authentication mechanisms\n");
1044
1045 /* Scan the configured authenticators looking for one which is configured
1046 for use as a client, which is not suppressed by client_condition, and
1047 whose name matches an authentication mechanism supported by the server.
1048 If one is found, attempt to authenticate by calling its client function.
1049 */
1050
1051 for (au = auths; !smtp_authenticated && au != NULL; au = au->next)
1052 {
1053 uschar *p = names;
1054 if (!au->client ||
1055 (au->client_condition != NULL &&
1056 !expand_check_condition(au->client_condition, au->name,
1057 US"client authenticator")))
1058 {
1059 DEBUG(D_transport) debug_printf("skipping %s authenticator: %s\n",
1060 au->name,
1061 (au->client)? "client_condition is false" :
1062 "not configured as a client");
1063 continue;
1064 }
1065
1066 /* Loop to scan supported server mechanisms */
1067
1068 while (*p != 0)
1069 {
1070 int rc;
1071 int len = Ustrlen(au->public_name);
1072 while (isspace(*p)) p++;
1073
1074 if (strncmpic(au->public_name, p, len) != 0 ||
1075 (p[len] != 0 && !isspace(p[len])))
1076 {
1077 while (*p != 0 && !isspace(*p)) p++;
1078 continue;
1079 }
1080
1081 /* Found data for a listed mechanism. Call its client entry. Set
1082 a flag in the outblock so that data is overwritten after sending so
1083 that reflections don't show it. */
1084
1085 fail_reason = US"authentication attempt(s) failed";
1086 obp->authenticating = TRUE;
1087 rc = (au->info->clientcode)(au, ibp, obp,
1088 ob->command_timeout, buffer, bufsize);
1089 obp->authenticating = FALSE;
1090 DEBUG(D_transport) debug_printf("%s authenticator yielded %d\n",
1091 au->name, rc);
1092
1093 /* A temporary authentication failure must hold up delivery to
1094 this host. After a permanent authentication failure, we carry on
1095 to try other authentication methods. If all fail hard, try to
1096 deliver the message unauthenticated unless require_auth was set. */
1097
1098 switch(rc)
1099 {
1100 case OK:
1101 smtp_authenticated = TRUE; /* stops the outer loop */
1102 client_authenticator = au->name;
1103 if (au->set_client_id != NULL)
1104 client_authenticated_id = expand_string(au->set_client_id);
1105 break;
1106
1107 /* Failure after writing a command */
1108
1109 case FAIL_SEND:
1110 return FAIL_SEND;
1111
1112 /* Failure after reading a response */
1113
1114 case FAIL:
1115 if (errno != 0 || buffer[0] != '5') return FAIL;
1116 log_write(0, LOG_MAIN, "%s authenticator failed H=%s [%s] %s",
1117 au->name, host->name, host->address, buffer);
1118 break;
1119
1120 /* Failure by some other means. In effect, the authenticator
1121 decided it wasn't prepared to handle this case. Typically this
1122 is the result of "fail" in an expansion string. Do we need to
1123 log anything here? Feb 2006: a message is now put in the buffer
1124 if logging is required. */
1125
1126 case CANCELLED:
1127 if (*buffer != 0)
1128 log_write(0, LOG_MAIN, "%s authenticator cancelled "
1129 "authentication H=%s [%s] %s", au->name, host->name,
1130 host->address, buffer);
1131 break;
1132
1133 /* Internal problem, message in buffer. */
1134
1135 case ERROR:
1136 set_errno_nohost(addrlist, ERRNO_AUTHPROB, string_copy(buffer),
1137 DEFER, FALSE);
1138 return ERROR;
1139 }
1140
1141 break; /* If not authenticated, try next authenticator */
1142 } /* Loop for scanning supported server mechanisms */
1143 } /* Loop for further authenticators */
1144 }
1145 }
1146
1147 /* If we haven't authenticated, but are required to, give up. */
1148
1149 if (require_auth == OK && !smtp_authenticated)
1150 {
1151 set_errno_nohost(addrlist, ERRNO_AUTHFAIL,
1152 string_sprintf("authentication required but %s", fail_reason), DEFER,
1153 FALSE);
1154 return DEFER;
1155 }
1156
1157 return OK;
1158 }
1159
1160
1161 /* Construct AUTH appendix string for MAIL TO */
1162 /*
1163 Arguments
1164 buffer to build string
1165 addrlist chain of potential addresses to deliver
1166 ob transport options
1167
1168 Globals smtp_authenticated
1169 client_authenticated_sender
1170 Return True on error, otherwise buffer has (possibly empty) terminated string
1171 */
1172
1173 BOOL
1174 smtp_mail_auth_str(uschar *buffer, unsigned bufsize, address_item *addrlist,
1175 smtp_transport_options_block *ob)
1176 {
1177 uschar *local_authenticated_sender = authenticated_sender;
1178
1179 #ifdef notdef
1180 debug_printf("smtp_mail_auth_str: as<%s> os<%s> SA<%s>\n", authenticated_sender, ob->authenticated_sender, smtp_authenticated?"Y":"N");
1181 #endif
1182
1183 if (ob->authenticated_sender != NULL)
1184 {
1185 uschar *new = expand_string(ob->authenticated_sender);
1186 if (new == NULL)
1187 {
1188 if (!expand_string_forcedfail)
1189 {
1190 uschar *message = string_sprintf("failed to expand "
1191 "authenticated_sender: %s", expand_string_message);
1192 set_errno_nohost(addrlist, ERRNO_EXPANDFAIL, message, DEFER, FALSE);
1193 return TRUE;
1194 }
1195 }
1196 else if (new[0] != 0) local_authenticated_sender = new;
1197 }
1198
1199 /* Add the authenticated sender address if present */
1200
1201 if ((smtp_authenticated || ob->authenticated_sender_force) &&
1202 local_authenticated_sender != NULL)
1203 {
1204 string_format(buffer, bufsize, " AUTH=%s",
1205 auth_xtextencode(local_authenticated_sender,
1206 Ustrlen(local_authenticated_sender)));
1207 client_authenticated_sender = string_copy(local_authenticated_sender);
1208 }
1209 else
1210 *buffer= 0;
1211
1212 return FALSE;
1213 }
1214
1215
1216
1217 #ifdef EXPERIMENTAL_DANE
1218 /* Lookup TLSA record for host/port.
1219 Return: OK success with dnssec; DANE mode
1220 DEFER Do not use this host now, may retry later
1221 FAIL_FORCED No TLSA record; DANE not usable
1222 FAIL Do not use this connection
1223 */
1224
1225 int
1226 tlsa_lookup(const host_item * host, dns_answer * dnsa, BOOL dane_required)
1227 {
1228 /* move this out to host.c given the similarity to dns_lookup() ? */
1229 uschar buffer[300];
1230 const uschar * fullname = buffer;
1231
1232 /* TLSA lookup string */
1233 (void)sprintf(CS buffer, "_%d._tcp.%.256s", host->port, host->name);
1234
1235 switch (dns_lookup(dnsa, buffer, T_TLSA, &fullname))
1236 {
1237 case DNS_SUCCEED:
1238 if (!dns_is_secure(dnsa))
1239 {
1240 log_write(0, LOG_MAIN, "DANE error: TLSA lookup not DNSSEC");
1241 return DEFER;
1242 }
1243 return OK;
1244
1245 case DNS_AGAIN:
1246 return DEFER; /* just defer this TLS'd conn */
1247
1248 case DNS_NOMATCH:
1249 return dane_required ? FAIL : FAIL_FORCED;
1250
1251 default:
1252 case DNS_FAIL:
1253 return dane_required ? FAIL : DEFER;
1254 }
1255 }
1256 #endif
1257
1258
1259
1260 typedef struct smtp_compare_s
1261 {
1262 uschar *current_sender_address;
1263 struct transport_instance *tblock;
1264 } smtp_compare_t;
1265
1266 /*
1267 Create a unique string that identifies this message, it is based on
1268 sender_address, helo_data and tls_certificate if enabled. */
1269
1270 static uschar *
1271 smtp_local_identity(uschar * sender, struct transport_instance * tblock)
1272 {
1273 address_item * addr1;
1274 uschar * if1 = US"";
1275 uschar * helo1 = US"";
1276 #ifdef SUPPORT_TLS
1277 uschar * tlsc1 = US"";
1278 #endif
1279 uschar * save_sender_address = sender_address;
1280 uschar * local_identity = NULL;
1281 smtp_transport_options_block * ob =
1282 (smtp_transport_options_block *)tblock->options_block;
1283
1284 sender_address = sender;
1285
1286 addr1 = deliver_make_addr (sender, TRUE);
1287 deliver_set_expansions(addr1);
1288
1289 if (ob->interface)
1290 if1 = expand_string(ob->interface);
1291
1292 if (ob->helo_data)
1293 helo1 = expand_string(ob->helo_data);
1294
1295 #ifdef SUPPORT_TLS
1296 if (ob->tls_certificate)
1297 tlsc1 = expand_string(ob->tls_certificate);
1298 local_identity = string_sprintf ("%s^%s^%s", if1, helo1, tlsc1);
1299 #else
1300 local_identity = string_sprintf ("%s^%s", if1, helo1);
1301 #endif
1302
1303 deliver_set_expansions(NULL);
1304 sender_address = save_sender_address;
1305
1306 return local_identity;
1307 }
1308
1309
1310
1311 /* This routine is a callback that is called from transport_check_waiting.
1312 This function will evaluate the incoming message versus the previous
1313 message. If the incoming message is using a different local identity then
1314 we will veto this new message. */
1315
1316 static BOOL
1317 smtp_are_same_identities(uschar * message_id, smtp_compare_t * s_compare)
1318 {
1319 uschar * message_local_identity,
1320 * current_local_identity,
1321 * new_sender_address;
1322
1323 current_local_identity =
1324 smtp_local_identity(s_compare->current_sender_address, s_compare->tblock);
1325
1326 if (!(new_sender_address = deliver_get_sender_address(message_id)))
1327 return 0;
1328
1329 message_local_identity =
1330 smtp_local_identity(new_sender_address, s_compare->tblock);
1331
1332 return Ustrcmp(current_local_identity, message_local_identity) == 0;
1333 }
1334
1335
1336
1337 uschar
1338 ehlo_response(uschar * buf, size_t bsize, uschar checks)
1339 {
1340 #ifdef SUPPORT_TLS
1341 if (checks & PEER_OFFERED_TLS)
1342 if (pcre_exec(regex_STARTTLS, NULL, CS buf, bsize, 0, PCRE_EOPT, NULL, 0) < 0)
1343 checks &= ~PEER_OFFERED_TLS;
1344 #endif
1345
1346 if ( checks & PEER_OFFERED_IGNQ
1347 && pcre_exec(regex_IGNOREQUOTA, NULL, CS buf, bsize, 0,
1348 PCRE_EOPT, NULL, 0) < 0)
1349 checks &= ~PEER_OFFERED_IGNQ;
1350
1351 #ifndef DISABLE_PRDR
1352 if ( checks & PEER_OFFERED_PRDR
1353 && pcre_exec(regex_PRDR, NULL, CS buf, bsize, 0, PCRE_EOPT, NULL, 0) < 0)
1354 checks &= ~PEER_OFFERED_PRDR;
1355 #endif
1356
1357 #ifdef SUPPORT_I18N
1358 if ( checks & PEER_OFFERED_UTF8
1359 && pcre_exec(regex_UTF8, NULL, CS buf, bsize, 0, PCRE_EOPT, NULL, 0) < 0)
1360 checks &= ~PEER_OFFERED_UTF8;
1361 #endif
1362
1363 if ( checks & PEER_OFFERED_DSN
1364 && pcre_exec(regex_DSN, NULL, CS buf, bsize, 0, PCRE_EOPT, NULL, 0) < 0)
1365 checks &= ~PEER_OFFERED_DSN;
1366
1367 if ( checks & PEER_OFFERED_PIPE
1368 && pcre_exec(regex_PIPELINING, NULL, CS buf, bsize, 0,
1369 PCRE_EOPT, NULL, 0) < 0)
1370 checks &= ~PEER_OFFERED_PIPE;
1371
1372 if ( checks & PEER_OFFERED_SIZE
1373 && pcre_exec(regex_SIZE, NULL, CS buf, bsize, 0, PCRE_EOPT, NULL, 0) < 0)
1374 checks &= ~PEER_OFFERED_SIZE;
1375
1376 return checks;
1377 }
1378
1379
1380 /*************************************************
1381 * Deliver address list to given host *
1382 *************************************************/
1383
1384 /* If continue_hostname is not null, we get here only when continuing to
1385 deliver down an existing channel. The channel was passed as the standard
1386 input. TLS is never active on a passed channel; the previous process always
1387 closes it down before passing the connection on.
1388
1389 Otherwise, we have to make a connection to the remote host, and do the
1390 initial protocol exchange.
1391
1392 When running as an MUA wrapper, if the sender or any recipient is rejected,
1393 temporarily or permanently, we force failure for all recipients.
1394
1395 Arguments:
1396 addrlist chain of potential addresses to deliver; only those whose
1397 transport_return field is set to PENDING_DEFER are currently
1398 being processed; others should be skipped - they have either
1399 been delivered to an earlier host or IP address, or been
1400 failed by one of them.
1401 host host to deliver to
1402 host_af AF_INET or AF_INET6
1403 port default TCP/IP port to use, in host byte order
1404 interface interface to bind to, or NULL
1405 tblock transport instance block
1406 message_defer set TRUE if yield is OK, but all addresses were deferred
1407 because of a non-recipient, non-host failure, that is, a
1408 4xx response to MAIL FROM, DATA, or ".". This is a defer
1409 that is specific to the message.
1410 suppress_tls if TRUE, don't attempt a TLS connection - this is set for
1411 a second attempt after TLS initialization fails
1412
1413 Returns: OK - the connection was made and the delivery attempted;
1414 the result for each address is in its data block.
1415 DEFER - the connection could not be made, or something failed
1416 while setting up the SMTP session, or there was a
1417 non-message-specific error, such as a timeout.
1418 ERROR - a filter command is specified for this transport,
1419 and there was a problem setting it up; OR helo_data
1420 or add_headers or authenticated_sender is specified
1421 for this transport, and the string failed to expand
1422 */
1423
1424 static int
1425 smtp_deliver(address_item *addrlist, host_item *host, int host_af, int port,
1426 uschar *interface, transport_instance *tblock,
1427 BOOL *message_defer, BOOL suppress_tls)
1428 {
1429 address_item *addr;
1430 address_item *sync_addr;
1431 address_item *first_addr = addrlist;
1432 int yield = OK;
1433 int address_count;
1434 int save_errno;
1435 int rc;
1436 time_t start_delivery_time = time(NULL);
1437 smtp_transport_options_block *ob =
1438 (smtp_transport_options_block *)(tblock->options_block);
1439 BOOL lmtp = strcmpic(ob->protocol, US"lmtp") == 0;
1440 BOOL smtps = strcmpic(ob->protocol, US"smtps") == 0;
1441 BOOL ok = FALSE;
1442 BOOL send_rset = TRUE;
1443 BOOL send_quit = TRUE;
1444 BOOL setting_up = TRUE;
1445 BOOL completed_address = FALSE;
1446 BOOL esmtp = TRUE;
1447 BOOL pending_MAIL;
1448 BOOL pass_message = FALSE;
1449 uschar peer_offered = 0; /*XXX should this be handed on cf. tls_offered, smtp_use_dsn ? */
1450 #ifndef DISABLE_PRDR
1451 BOOL prdr_active;
1452 #endif
1453 #ifdef SUPPORT_I18N
1454 BOOL utf8_needed = FALSE;
1455 #endif
1456 BOOL dsn_all_lasthop = TRUE;
1457 #if defined(SUPPORT_TLS) && defined(EXPERIMENTAL_DANE)
1458 BOOL dane = FALSE;
1459 BOOL dane_required = verify_check_given_host(&ob->hosts_require_dane, host) == OK;
1460 dns_answer tlsa_dnsa;
1461 #endif
1462 smtp_inblock inblock;
1463 smtp_outblock outblock;
1464 int max_rcpt = tblock->max_addresses;
1465 uschar *igquotstr = US"";
1466
1467 #ifdef EXPERIMENTAL_DSN_INFO
1468 uschar *smtp_greeting = NULL;
1469 uschar *helo_response = NULL;
1470 #endif
1471 uschar *helo_data = NULL;
1472
1473 uschar *message = NULL;
1474 uschar new_message_id[MESSAGE_ID_LENGTH + 1];
1475 uschar *p;
1476 uschar buffer[4096];
1477 uschar inbuffer[4096];
1478 uschar outbuffer[4096];
1479
1480 suppress_tls = suppress_tls; /* stop compiler warning when no TLS support */
1481
1482 *message_defer = FALSE;
1483 smtp_command = US"initial connection";
1484 if (max_rcpt == 0) max_rcpt = 999999;
1485
1486 /* Set up the buffer for reading SMTP response packets. */
1487
1488 inblock.buffer = inbuffer;
1489 inblock.buffersize = sizeof(inbuffer);
1490 inblock.ptr = inbuffer;
1491 inblock.ptrend = inbuffer;
1492
1493 /* Set up the buffer for holding SMTP commands while pipelining */
1494
1495 outblock.buffer = outbuffer;
1496 outblock.buffersize = sizeof(outbuffer);
1497 outblock.ptr = outbuffer;
1498 outblock.cmd_count = 0;
1499 outblock.authenticating = FALSE;
1500
1501 /* Reset the parameters of a TLS session. */
1502
1503 tls_out.bits = 0;
1504 tls_out.cipher = NULL; /* the one we may use for this transport */
1505 tls_out.ourcert = NULL;
1506 tls_out.peercert = NULL;
1507 tls_out.peerdn = NULL;
1508 #if defined(SUPPORT_TLS) && !defined(USE_GNUTLS)
1509 tls_out.sni = NULL;
1510 #endif
1511 tls_out.ocsp = OCSP_NOT_REQ;
1512
1513 /* Flip the legacy TLS-related variables over to the outbound set in case
1514 they're used in the context of the transport. Don't bother resetting
1515 afterward as we're in a subprocess. */
1516
1517 tls_modify_variables(&tls_out);
1518
1519 #ifndef SUPPORT_TLS
1520 if (smtps)
1521 {
1522 set_errno_nohost(addrlist, ERRNO_TLSFAILURE, US"TLS support not available",
1523 DEFER, FALSE);
1524 return ERROR;
1525 }
1526 #endif
1527
1528 /* Make a connection to the host if this isn't a continued delivery, and handle
1529 the initial interaction and HELO/EHLO/LHLO. Connect timeout errors are handled
1530 specially so they can be identified for retries. */
1531
1532 if (continue_hostname == NULL)
1533 {
1534 /* This puts port into host->port */
1535 inblock.sock = outblock.sock =
1536 smtp_connect(host, host_af, port, interface, ob->connect_timeout, tblock);
1537
1538 if (inblock.sock < 0)
1539 {
1540 set_errno_nohost(addrlist, (errno == ETIMEDOUT)? ERRNO_CONNECTTIMEOUT : errno,
1541 NULL, DEFER, FALSE);
1542 return DEFER;
1543 }
1544
1545 #if defined(SUPPORT_TLS) && defined(EXPERIMENTAL_DANE)
1546 {
1547 tls_out.dane_verified = FALSE;
1548 tls_out.tlsa_usage = 0;
1549
1550 if (host->dnssec == DS_YES)
1551 {
1552 if( dane_required
1553 || verify_check_given_host(&ob->hosts_try_dane, host) == OK
1554 )
1555 switch (rc = tlsa_lookup(host, &tlsa_dnsa, dane_required))
1556 {
1557 case OK: dane = TRUE; break;
1558 case FAIL_FORCED: break;
1559 default: set_errno_nohost(addrlist, ERRNO_DNSDEFER,
1560 string_sprintf("DANE error: tlsa lookup %s",
1561 rc == DEFER ? "DEFER" : "FAIL"),
1562 rc, FALSE);
1563 return rc;
1564 }
1565 }
1566 else if (dane_required)
1567 {
1568 set_errno_nohost(addrlist, ERRNO_DNSDEFER,
1569 string_sprintf("DANE error: %s lookup not DNSSEC", host->name),
1570 FAIL, FALSE);
1571 return FAIL;
1572 }
1573
1574 if (dane)
1575 ob->tls_tempfail_tryclear = FALSE;
1576 }
1577 #endif /*DANE*/
1578
1579 /* Expand the greeting message while waiting for the initial response. (Makes
1580 sense if helo_data contains ${lookup dnsdb ...} stuff). The expansion is
1581 delayed till here so that $sending_interface and $sending_port are set. */
1582
1583 helo_data = expand_string(ob->helo_data);
1584 #ifdef SUPPORT_I18N
1585 if (helo_data)
1586 {
1587 uschar * errstr = NULL;
1588 if ((helo_data = string_domain_utf8_to_alabel(helo_data, &errstr)), errstr)
1589 {
1590 errstr = string_sprintf("failed to expand helo_data: %s", errstr);
1591 set_errno_nohost(addrlist, ERRNO_EXPANDFAIL, errstr, DEFER, FALSE);
1592 yield = DEFER;
1593 goto SEND_QUIT;
1594 }
1595 }
1596 #endif
1597
1598 /* The first thing is to wait for an initial OK response. The dreaded "goto"
1599 is nevertheless a reasonably clean way of programming this kind of logic,
1600 where you want to escape on any error. */
1601
1602 if (!smtps)
1603 {
1604 BOOL good_response = smtp_read_response(&inblock, buffer, sizeof(buffer),
1605 '2', ob->command_timeout);
1606 #ifdef EXPERIMENTAL_DSN_INFO
1607 smtp_greeting = string_copy(buffer);
1608 #endif
1609 if (!good_response) goto RESPONSE_FAILED;
1610
1611 #ifndef DISABLE_EVENT
1612 {
1613 uschar * s;
1614 lookup_dnssec_authenticated = host->dnssec==DS_YES ? US"yes"
1615 : host->dnssec==DS_NO ? US"no" : NULL;
1616 s = event_raise(tblock->event_action, US"smtp:connect", buffer);
1617 if (s)
1618 {
1619 set_errno_nohost(addrlist, ERRNO_EXPANDFAIL,
1620 string_sprintf("deferred by smtp:connect event expansion: %s", s),
1621 DEFER, FALSE);
1622 yield = DEFER;
1623 goto SEND_QUIT;
1624 }
1625 }
1626 #endif
1627
1628 /* Now check if the helo_data expansion went well, and sign off cleanly if
1629 it didn't. */
1630
1631 if (helo_data == NULL)
1632 {
1633 uschar *message = string_sprintf("failed to expand helo_data: %s",
1634 expand_string_message);
1635 set_errno_nohost(addrlist, ERRNO_EXPANDFAIL, message, DEFER, FALSE);
1636 yield = DEFER;
1637 goto SEND_QUIT;
1638 }
1639 }
1640
1641 /** Debugging without sending a message
1642 addrlist->transport_return = DEFER;
1643 goto SEND_QUIT;
1644 **/
1645
1646 /* Errors that occur after this point follow an SMTP command, which is
1647 left in big_buffer by smtp_write_command() for use in error messages. */
1648
1649 smtp_command = big_buffer;
1650
1651 /* Tell the remote who we are...
1652
1653 February 1998: A convention has evolved that ESMTP-speaking MTAs include the
1654 string "ESMTP" in their greeting lines, so make Exim send EHLO if the
1655 greeting is of this form. The assumption was that the far end supports it
1656 properly... but experience shows that there are some that give 5xx responses,
1657 even though the banner includes "ESMTP" (there's a bloody-minded one that
1658 says "ESMTP not spoken here"). Cope with that case.
1659
1660 September 2000: Time has passed, and it seems reasonable now to always send
1661 EHLO at the start. It is also convenient to make the change while installing
1662 the TLS stuff.
1663
1664 July 2003: Joachim Wieland met a broken server that advertises "PIPELINING"
1665 but times out after sending MAIL FROM, RCPT TO and DATA all together. There
1666 would be no way to send out the mails, so there is now a host list
1667 "hosts_avoid_esmtp" that disables ESMTP for special hosts and solves the
1668 PIPELINING problem as well. Maybe it can also be useful to cure other
1669 problems with broken servers.
1670
1671 Exim originally sent "Helo" at this point and ran for nearly a year that way.
1672 Then somebody tried it with a Microsoft mailer... It seems that all other
1673 mailers use upper case for some reason (the RFC is quite clear about case
1674 independence) so, for peace of mind, I gave in. */
1675
1676 esmtp = verify_check_given_host(&ob->hosts_avoid_esmtp, host) != OK;
1677
1678 /* Alas; be careful, since this goto is not an error-out, so conceivably
1679 we might set data between here and the target which we assume to exist
1680 and be usable. I can see this coming back to bite us. */
1681 #ifdef SUPPORT_TLS
1682 if (smtps)
1683 {
1684 tls_offered = TRUE;
1685 suppress_tls = FALSE;
1686 ob->tls_tempfail_tryclear = FALSE;
1687 smtp_command = US"SSL-on-connect";
1688 goto TLS_NEGOTIATE;
1689 }
1690 #endif
1691
1692 if (esmtp)
1693 {
1694 if (smtp_write_command(&outblock, FALSE, "%s %s\r\n",
1695 lmtp? "LHLO" : "EHLO", helo_data) < 0)
1696 goto SEND_FAILED;
1697 if (!smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
1698 ob->command_timeout))
1699 {
1700 if (errno != 0 || buffer[0] == 0 || lmtp)
1701 {
1702 #ifdef EXPERIMENTAL_DSN_INFO
1703 helo_response = string_copy(buffer);
1704 #endif
1705 goto RESPONSE_FAILED;
1706 }
1707 esmtp = FALSE;
1708 }
1709 #ifdef EXPERIMENTAL_DSN_INFO
1710 helo_response = string_copy(buffer);
1711 #endif
1712 }
1713 else
1714 {
1715 DEBUG(D_transport)
1716 debug_printf("not sending EHLO (host matches hosts_avoid_esmtp)\n");
1717 }
1718
1719 if (!esmtp)
1720 {
1721 BOOL good_response;
1722
1723 if (smtp_write_command(&outblock, FALSE, "HELO %s\r\n", helo_data) < 0)
1724 goto SEND_FAILED;
1725 good_response = smtp_read_response(&inblock, buffer, sizeof(buffer),
1726 '2', ob->command_timeout);
1727 #ifdef EXPERIMENTAL_DSN_INFO
1728 helo_response = string_copy(buffer);
1729 #endif
1730 if (!good_response) goto RESPONSE_FAILED;
1731 }
1732
1733 if (esmtp || lmtp)
1734 peer_offered = ehlo_response(buffer, Ustrlen(buffer),
1735 PEER_OFFERED_TLS
1736 | 0 /* IGNQ checked later */
1737 | 0 /* PRDR checked later */
1738 | 0 /* UTF8 checked later */
1739 | 0 /* DSN checked later */
1740 | 0 /* PIPE checked later */
1741 | 0 /* SIZE checked later */
1742 );
1743
1744 /* Set tls_offered if the response to EHLO specifies support for STARTTLS. */
1745
1746 #ifdef SUPPORT_TLS
1747 tls_offered = !!(peer_offered & PEER_OFFERED_TLS);
1748 #endif
1749 }
1750
1751 /* For continuing deliveries down the same channel, the socket is the standard
1752 input, and we don't need to redo EHLO here (but may need to do so for TLS - see
1753 below). Set up the pointer to where subsequent commands will be left, for
1754 error messages. Note that smtp_use_size and smtp_use_pipelining will have been
1755 set from the command line if they were set in the process that passed the
1756 connection on. */
1757
1758 /*XXX continue case needs to propagate DSN_INFO, prob. in deliver.c
1759 as the contine goes via transport_pass_socket() and doublefork and exec.
1760 It does not wait. Unclear how we keep separate host's responses
1761 separate - we could match up by host ip+port as a bodge. */
1762
1763 else
1764 {
1765 inblock.sock = outblock.sock = fileno(stdin);
1766 smtp_command = big_buffer;
1767 host->port = port; /* Record the port that was used */
1768 }
1769
1770 /* If TLS is available on this connection, whether continued or not, attempt to
1771 start up a TLS session, unless the host is in hosts_avoid_tls. If successful,
1772 send another EHLO - the server may give a different answer in secure mode. We
1773 use a separate buffer for reading the response to STARTTLS so that if it is
1774 negative, the original EHLO data is available for subsequent analysis, should
1775 the client not be required to use TLS. If the response is bad, copy the buffer
1776 for error analysis. */
1777
1778 #ifdef SUPPORT_TLS
1779 if ( tls_offered
1780 && !suppress_tls
1781 && verify_check_given_host(&ob->hosts_avoid_tls, host) != OK)
1782 {
1783 uschar buffer2[4096];
1784 if (smtp_write_command(&outblock, FALSE, "STARTTLS\r\n") < 0)
1785 goto SEND_FAILED;
1786
1787 /* If there is an I/O error, transmission of this message is deferred. If
1788 there is a temporary rejection of STARRTLS and tls_tempfail_tryclear is
1789 false, we also defer. However, if there is a temporary rejection of STARTTLS
1790 and tls_tempfail_tryclear is true, or if there is an outright rejection of
1791 STARTTLS, we carry on. This means we will try to send the message in clear,
1792 unless the host is in hosts_require_tls (tested below). */
1793
1794 if (!smtp_read_response(&inblock, buffer2, sizeof(buffer2), '2',
1795 ob->command_timeout))
1796 {
1797 if ( errno != 0
1798 || buffer2[0] == 0
1799 || (buffer2[0] == '4' && !ob->tls_tempfail_tryclear)
1800 )
1801 {
1802 Ustrncpy(buffer, buffer2, sizeof(buffer));
1803 goto RESPONSE_FAILED;
1804 }
1805 }
1806
1807 /* STARTTLS accepted: try to negotiate a TLS session. */
1808
1809 else
1810 TLS_NEGOTIATE:
1811 {
1812 int rc = tls_client_start(inblock.sock, host, addrlist, tblock
1813 # ifdef EXPERIMENTAL_DANE
1814 , dane ? &tlsa_dnsa : NULL
1815 # endif
1816 );
1817
1818 /* TLS negotiation failed; give an error. From outside, this function may
1819 be called again to try in clear on a new connection, if the options permit
1820 it for this host. */
1821
1822 if (rc != OK)
1823 {
1824 # ifdef EXPERIMENTAL_DANE
1825 if (rc == DEFER && dane)
1826 {
1827 log_write(0, LOG_MAIN,
1828 "DANE attempt failed; no TLS connection to %s [%s]",
1829 host->name, host->address);
1830 }
1831 # endif
1832
1833 save_errno = ERRNO_TLSFAILURE;
1834 message = US"failure while setting up TLS session";
1835 send_quit = FALSE;
1836 goto TLS_FAILED;
1837 }
1838
1839 /* TLS session is set up */
1840
1841 for (addr = addrlist; addr; addr = addr->next)
1842 if (addr->transport_return == PENDING_DEFER)
1843 {
1844 addr->cipher = tls_out.cipher;
1845 addr->ourcert = tls_out.ourcert;
1846 addr->peercert = tls_out.peercert;
1847 addr->peerdn = tls_out.peerdn;
1848 addr->ocsp = tls_out.ocsp;
1849 }
1850 }
1851 }
1852
1853 /* if smtps, we'll have smtp_command set to something else; always safe to
1854 reset it here. */
1855 smtp_command = big_buffer;
1856
1857 /* If we started TLS, redo the EHLO/LHLO exchange over the secure channel. If
1858 helo_data is null, we are dealing with a connection that was passed from
1859 another process, and so we won't have expanded helo_data above. We have to
1860 expand it here. $sending_ip_address and $sending_port are set up right at the
1861 start of the Exim process (in exim.c). */
1862
1863 if (tls_out.active >= 0)
1864 {
1865 char *greeting_cmd;
1866 BOOL good_response;
1867
1868 if (helo_data == NULL)
1869 {
1870 helo_data = expand_string(ob->helo_data);
1871 if (helo_data == NULL)
1872 {
1873 uschar *message = string_sprintf("failed to expand helo_data: %s",
1874 expand_string_message);
1875 set_errno_nohost(addrlist, ERRNO_EXPANDFAIL, message, DEFER, FALSE);
1876 yield = DEFER;
1877 goto SEND_QUIT;
1878 }
1879 }
1880
1881 /* For SMTPS we need to wait for the initial OK response. */
1882 if (smtps)
1883 {
1884 good_response = smtp_read_response(&inblock, buffer, sizeof(buffer),
1885 '2', ob->command_timeout);
1886 #ifdef EXPERIMENTAL_DSN_INFO
1887 smtp_greeting = string_copy(buffer);
1888 #endif
1889 if (!good_response) goto RESPONSE_FAILED;
1890 }
1891
1892 if (esmtp)
1893 greeting_cmd = "EHLO";
1894 else
1895 {
1896 greeting_cmd = "HELO";
1897 DEBUG(D_transport)
1898 debug_printf("not sending EHLO (host matches hosts_avoid_esmtp)\n");
1899 }
1900
1901 if (smtp_write_command(&outblock, FALSE, "%s %s\r\n",
1902 lmtp? "LHLO" : greeting_cmd, helo_data) < 0)
1903 goto SEND_FAILED;
1904 good_response = smtp_read_response(&inblock, buffer, sizeof(buffer),
1905 '2', ob->command_timeout);
1906 #ifdef EXPERIMENTAL_DSN_INFO
1907 helo_response = string_copy(buffer);
1908 #endif
1909 if (!good_response) goto RESPONSE_FAILED;
1910 }
1911
1912 /* If the host is required to use a secure channel, ensure that we
1913 have one. */
1914
1915 else if (
1916 # ifdef EXPERIMENTAL_DANE
1917 dane ||
1918 # endif
1919 verify_check_given_host(&ob->hosts_require_tls, host) == OK
1920 )
1921 {
1922 save_errno = ERRNO_TLSREQUIRED;
1923 message = string_sprintf("a TLS session is required, but %s",
1924 tls_offered? "an attempt to start TLS failed" :
1925 "the server did not offer TLS support");
1926 goto TLS_FAILED;
1927 }
1928 #endif /*SUPPORT_TLS*/
1929
1930 /* If TLS is active, we have just started it up and re-done the EHLO command,
1931 so its response needs to be analyzed. If TLS is not active and this is a
1932 continued session down a previously-used socket, we haven't just done EHLO, so
1933 we skip this. */
1934
1935 if (continue_hostname == NULL
1936 #ifdef SUPPORT_TLS
1937 || tls_out.active >= 0
1938 #endif
1939 )
1940 {
1941 if (esmtp || lmtp)
1942 peer_offered = ehlo_response(buffer, Ustrlen(buffer),
1943 0 /* no TLS */
1944 | (lmtp && ob->lmtp_ignore_quota ? PEER_OFFERED_IGNQ : 0)
1945 | PEER_OFFERED_PRDR
1946 #ifdef SUPPORT_I18N
1947 | (addrlist->prop.utf8_msg ? PEER_OFFERED_UTF8 : 0)
1948 /*XXX if we hand peercaps on to continued-conn processes,
1949 must not depend on this addr */
1950 #endif
1951 | PEER_OFFERED_DSN
1952 | PEER_OFFERED_PIPE
1953 | (ob->size_addition >= 0 ? PEER_OFFERED_SIZE : 0)
1954 );
1955
1956 /* Set for IGNOREQUOTA if the response to LHLO specifies support and the
1957 lmtp_ignore_quota option was set. */
1958
1959 igquotstr = peer_offered & PEER_OFFERED_IGNQ ? US" IGNOREQUOTA" : US"";
1960
1961 /* If the response to EHLO specified support for the SIZE parameter, note
1962 this, provided size_addition is non-negative. */
1963
1964 smtp_use_size = !!(peer_offered & PEER_OFFERED_SIZE);
1965
1966 /* Note whether the server supports PIPELINING. If hosts_avoid_esmtp matched
1967 the current host, esmtp will be false, so PIPELINING can never be used. If
1968 the current host matches hosts_avoid_pipelining, don't do it. */
1969
1970 smtp_use_pipelining = peer_offered & PEER_OFFERED_PIPE
1971 && verify_check_given_host(&ob->hosts_avoid_pipelining, host) != OK;
1972
1973 DEBUG(D_transport) debug_printf("%susing PIPELINING\n",
1974 smtp_use_pipelining ? "" : "not ");
1975
1976 #ifndef DISABLE_PRDR
1977 if ( peer_offered & PEER_OFFERED_PRDR
1978 && verify_check_given_host(&ob->hosts_try_prdr, host) != OK)
1979 peer_offered &= ~PEER_OFFERED_PRDR;
1980
1981 if (peer_offered & PEER_OFFERED_PRDR)
1982 {DEBUG(D_transport) debug_printf("PRDR usable\n");}
1983 #endif
1984
1985 /* Note if the server supports DSN */
1986 smtp_use_dsn = !!(peer_offered & PEER_OFFERED_DSN);
1987 DEBUG(D_transport) debug_printf("%susing DSN\n", smtp_use_dsn ? "" : "not ");
1988
1989 /* Note if the response to EHLO specifies support for the AUTH extension.
1990 If it has, check that this host is one we want to authenticate to, and do
1991 the business. The host name and address must be available when the
1992 authenticator's client driver is running. */
1993
1994 switch (yield = smtp_auth(buffer, sizeof(buffer), addrlist, host,
1995 ob, esmtp, &inblock, &outblock))
1996 {
1997 default: goto SEND_QUIT;
1998 case OK: break;
1999 case FAIL_SEND: goto SEND_FAILED;
2000 case FAIL: goto RESPONSE_FAILED;
2001 }
2002 }
2003
2004 /* The setting up of the SMTP call is now complete. Any subsequent errors are
2005 message-specific. */
2006
2007 setting_up = FALSE;
2008
2009 #ifdef SUPPORT_I18N
2010 if (addrlist->prop.utf8_msg)
2011 {
2012 utf8_needed = !addrlist->prop.utf8_downcvt
2013 && !addrlist->prop.utf8_downcvt_maybe;
2014 DEBUG(D_transport) if (!utf8_needed) debug_printf("utf8: %s downconvert\n",
2015 addrlist->prop.utf8_downcvt ? "mandatory" : "optional");
2016 }
2017
2018 /* If this is an international message we need the host to speak SMTPUTF8 */
2019 if (utf8_needed && !(peer_offered & PEER_OFFERED_UTF8))
2020 {
2021 errno = ERRNO_UTF8_FWD;
2022 goto RESPONSE_FAILED;
2023 }
2024 #endif
2025
2026 /* If there is a filter command specified for this transport, we can now
2027 set it up. This cannot be done until the identify of the host is known. */
2028
2029 if (tblock->filter_command != NULL)
2030 {
2031 BOOL rc;
2032 uschar buffer[64];
2033 sprintf(CS buffer, "%.50s transport", tblock->name);
2034 rc = transport_set_up_command(&transport_filter_argv, tblock->filter_command,
2035 TRUE, DEFER, addrlist, buffer, NULL);
2036 transport_filter_timeout = tblock->filter_timeout;
2037
2038 /* On failure, copy the error to all addresses, abandon the SMTP call, and
2039 yield ERROR. */
2040
2041 if (!rc)
2042 {
2043 set_errno_nohost(addrlist->next, addrlist->basic_errno, addrlist->message, DEFER,
2044 FALSE);
2045 yield = ERROR;
2046 goto SEND_QUIT;
2047 }
2048 }
2049
2050
2051 /* For messages that have more than the maximum number of envelope recipients,
2052 we want to send several transactions down the same SMTP connection. (See
2053 comments in deliver.c as to how this reconciles, heuristically, with
2054 remote_max_parallel.) This optimization was added to Exim after the following
2055 code was already working. The simplest way to put it in without disturbing the
2056 code was to use a goto to jump back to this point when there is another
2057 transaction to handle. */
2058
2059 SEND_MESSAGE:
2060 sync_addr = first_addr;
2061 address_count = 0;
2062 ok = FALSE;
2063 send_rset = TRUE;
2064 completed_address = FALSE;
2065
2066
2067 /* Initiate a message transfer. If we know the receiving MTA supports the SIZE
2068 qualification, send it, adding something to the message size to allow for
2069 imprecision and things that get added en route. Exim keeps the number of lines
2070 in a message, so we can give an accurate value for the original message, but we
2071 need some additional to handle added headers. (Double "." characters don't get
2072 included in the count.) */
2073
2074 p = buffer;
2075 *p = 0;
2076
2077 if (smtp_use_size)
2078 {
2079 sprintf(CS p, " SIZE=%d", message_size+message_linecount+ob->size_addition);
2080 while (*p) p++;
2081 }
2082
2083 #ifndef DISABLE_PRDR
2084 prdr_active = FALSE;
2085 if (peer_offered & PEER_OFFERED_PRDR)
2086 for (addr = first_addr; addr; addr = addr->next)
2087 if (addr->transport_return == PENDING_DEFER)
2088 {
2089 for (addr = addr->next; addr; addr = addr->next)
2090 if (addr->transport_return == PENDING_DEFER)
2091 { /* at least two recipients to send */
2092 prdr_active = TRUE;
2093 sprintf(CS p, " PRDR"); p += 5;
2094 break;
2095 }
2096 break;
2097 }
2098 #endif
2099
2100 #ifdef SUPPORT_I18N
2101 if ( addrlist->prop.utf8_msg
2102 && !addrlist->prop.utf8_downcvt
2103 && peer_offered & PEER_OFFERED_UTF8
2104 )
2105 sprintf(CS p, " SMTPUTF8"), p += 9;
2106 #endif
2107
2108 /* check if all addresses have lasthop flag */
2109 /* do not send RET and ENVID if true */
2110 for (dsn_all_lasthop = TRUE, addr = first_addr;
2111 address_count < max_rcpt && addr != NULL;
2112 addr = addr->next)
2113 if ((addr->dsn_flags & rf_dsnlasthop) != 1)
2114 {
2115 dsn_all_lasthop = FALSE;
2116 break;
2117 }
2118
2119 /* Add any DSN flags to the mail command */
2120
2121 if (smtp_use_dsn && !dsn_all_lasthop)
2122 {
2123 if (dsn_ret == dsn_ret_hdrs)
2124 {
2125 Ustrcpy(p, " RET=HDRS");
2126 while (*p) p++;
2127 }
2128 else if (dsn_ret == dsn_ret_full)
2129 {
2130 Ustrcpy(p, " RET=FULL");
2131 while (*p) p++;
2132 }
2133 if (dsn_envid != NULL)
2134 {
2135 string_format(p, sizeof(buffer) - (p-buffer), " ENVID=%s", dsn_envid);
2136 while (*p) p++;
2137 }
2138 }
2139
2140 /* If an authenticated_sender override has been specified for this transport
2141 instance, expand it. If the expansion is forced to fail, and there was already
2142 an authenticated_sender for this message, the original value will be used.
2143 Other expansion failures are serious. An empty result is ignored, but there is
2144 otherwise no check - this feature is expected to be used with LMTP and other
2145 cases where non-standard addresses (e.g. without domains) might be required. */
2146
2147 if (smtp_mail_auth_str(p, sizeof(buffer) - (p-buffer), addrlist, ob))
2148 {
2149 yield = ERROR;
2150 goto SEND_QUIT;
2151 }
2152
2153 /* From here until we send the DATA command, we can make use of PIPELINING
2154 if the server host supports it. The code has to be able to check the responses
2155 at any point, for when the buffer fills up, so we write it totally generally.
2156 When PIPELINING is off, each command written reports that it has flushed the
2157 buffer. */
2158
2159 pending_MAIL = TRUE; /* The block starts with MAIL */
2160
2161 {
2162 uschar * s = return_path;
2163 #ifdef SUPPORT_I18N
2164 uschar * errstr = NULL;
2165
2166 /* If we must downconvert, do the from-address here. Remember we had to
2167 for the to-addresses (done below), and also (ugly) for re-doing when building
2168 the delivery log line. */
2169
2170 if ( addrlist->prop.utf8_msg
2171 && (addrlist->prop.utf8_downcvt || !(peer_offered & PEER_OFFERED_UTF8))
2172 )
2173 {
2174 if (s = string_address_utf8_to_alabel(return_path, &errstr), errstr)
2175 {
2176 set_errno_nohost(addrlist, ERRNO_EXPANDFAIL, errstr, DEFER, FALSE);
2177 yield = ERROR;
2178 goto SEND_QUIT;
2179 }
2180 setflag(addrlist, af_utf8_downcvt);
2181 }
2182 #endif
2183
2184 rc = smtp_write_command(&outblock, smtp_use_pipelining,
2185 "MAIL FROM:<%s>%s\r\n", s, buffer);
2186 }
2187
2188 mail_command = string_copy(big_buffer); /* Save for later error message */
2189
2190 switch(rc)
2191 {
2192 case -1: /* Transmission error */
2193 goto SEND_FAILED;
2194
2195 case +1: /* Block was sent */
2196 if (!smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
2197 ob->command_timeout))
2198 {
2199 if (errno == 0 && buffer[0] == '4')
2200 {
2201 errno = ERRNO_MAIL4XX;
2202 addrlist->more_errno |= ((buffer[1] - '0')*10 + buffer[2] - '0') << 8;
2203 }
2204 goto RESPONSE_FAILED;
2205 }
2206 pending_MAIL = FALSE;
2207 break;
2208 }
2209
2210 /* Pass over all the relevant recipient addresses for this host, which are the
2211 ones that have status PENDING_DEFER. If we are using PIPELINING, we can send
2212 several before we have to read the responses for those seen so far. This
2213 checking is done by a subroutine because it also needs to be done at the end.
2214 Send only up to max_rcpt addresses at a time, leaving first_addr pointing to
2215 the next one if not all are sent.
2216
2217 In the MUA wrapper situation, we want to flush the PIPELINING buffer for the
2218 last address because we want to abort if any recipients have any kind of
2219 problem, temporary or permanent. We know that all recipient addresses will have
2220 the PENDING_DEFER status, because only one attempt is ever made, and we know
2221 that max_rcpt will be large, so all addresses will be done at once. */
2222
2223 for (addr = first_addr;
2224 address_count < max_rcpt && addr != NULL;
2225 addr = addr->next)
2226 {
2227 int count;
2228 BOOL no_flush;
2229 uschar * rcpt_addr;
2230
2231 addr->dsn_aware = smtp_use_dsn ? dsn_support_yes : dsn_support_no;
2232
2233 if (addr->transport_return != PENDING_DEFER) continue;
2234
2235 address_count++;
2236 no_flush = smtp_use_pipelining && (!mua_wrapper || addr->next != NULL);
2237
2238 /* Add any DSN flags to the rcpt command and add to the sent string */
2239
2240 p = buffer;
2241 *p = 0;
2242
2243 if (smtp_use_dsn && (addr->dsn_flags & rf_dsnlasthop) != 1)
2244 {
2245 if ((addr->dsn_flags & rf_dsnflags) != 0)
2246 {
2247 int i;
2248 BOOL first = TRUE;
2249 Ustrcpy(p, " NOTIFY=");
2250 while (*p) p++;
2251 for (i = 0; i < 4; i++)
2252 if ((addr->dsn_flags & rf_list[i]) != 0)
2253 {
2254 if (!first) *p++ = ',';
2255 first = FALSE;
2256 Ustrcpy(p, rf_names[i]);
2257 while (*p) p++;
2258 }
2259 }
2260
2261 if (addr->dsn_orcpt != NULL)
2262 {
2263 string_format(p, sizeof(buffer) - (p-buffer), " ORCPT=%s",
2264 addr->dsn_orcpt);
2265 while (*p) p++;
2266 }
2267 }
2268
2269 /* Now send the RCPT command, and process outstanding responses when
2270 necessary. After a timeout on RCPT, we just end the function, leaving the
2271 yield as OK, because this error can often mean that there is a problem with
2272 just one address, so we don't want to delay the host. */
2273
2274 rcpt_addr = transport_rcpt_address(addr, tblock->rcpt_include_affixes);
2275
2276 #ifdef SUPPORT_I18N
2277 {
2278 uschar * dummy_errstr;
2279 if ( testflag(addrlist, af_utf8_downcvt)
2280 && (rcpt_addr = string_address_utf8_to_alabel(rcpt_addr, &dummy_errstr),
2281 dummy_errstr
2282 ) )
2283 {
2284 errno = ERRNO_EXPANDFAIL;
2285 goto SEND_FAILED;
2286 }
2287 }
2288 #endif
2289
2290 count = smtp_write_command(&outblock, no_flush, "RCPT TO:<%s>%s%s\r\n",
2291 rcpt_addr, igquotstr, buffer);
2292
2293 if (count < 0) goto SEND_FAILED;
2294 if (count > 0)
2295 {
2296 switch(sync_responses(first_addr, tblock->rcpt_include_affixes,
2297 &sync_addr, host, count, ob->address_retry_include_sender,
2298 pending_MAIL, 0, &inblock, ob->command_timeout, buffer,
2299 sizeof(buffer)))
2300 {
2301 case 3: ok = TRUE; /* 2xx & 5xx => OK & progress made */
2302 case 2: completed_address = TRUE; /* 5xx (only) => progress made */
2303 break;
2304
2305 case 1: ok = TRUE; /* 2xx (only) => OK, but if LMTP, */
2306 if (!lmtp) completed_address = TRUE; /* can't tell about progress yet */
2307 case 0: /* No 2xx or 5xx, but no probs */
2308 break;
2309
2310 case -1: goto END_OFF; /* Timeout on RCPT */
2311 default: goto RESPONSE_FAILED; /* I/O error, or any MAIL error */
2312 }
2313 pending_MAIL = FALSE; /* Dealt with MAIL */
2314 }
2315 } /* Loop for next address */
2316
2317 /* If we are an MUA wrapper, abort if any RCPTs were rejected, either
2318 permanently or temporarily. We should have flushed and synced after the last
2319 RCPT. */
2320
2321 if (mua_wrapper)
2322 {
2323 address_item *badaddr;
2324 for (badaddr = first_addr; badaddr; badaddr = badaddr->next)
2325 if (badaddr->transport_return != PENDING_OK)
2326 {
2327 /*XXX could we find a better errno than 0 here? */
2328 set_errno_nohost(addrlist, 0, badaddr->message, FAIL,
2329 testflag(badaddr, af_pass_message));
2330 ok = FALSE;
2331 break;
2332 }
2333 }
2334
2335 /* If ok is TRUE, we know we have got at least one good recipient, and must now
2336 send DATA, but if it is FALSE (in the normal, non-wrapper case), we may still
2337 have a good recipient buffered up if we are pipelining. We don't want to waste
2338 time sending DATA needlessly, so we only send it if either ok is TRUE or if we
2339 are pipelining. The responses are all handled by sync_responses(). */
2340
2341 if (ok || (smtp_use_pipelining && !mua_wrapper))
2342 {
2343 int count = smtp_write_command(&outblock, FALSE, "DATA\r\n");
2344 if (count < 0) goto SEND_FAILED;
2345 switch(sync_responses(first_addr, tblock->rcpt_include_affixes, &sync_addr,
2346 host, count, ob->address_retry_include_sender, pending_MAIL,
2347 ok? +1 : -1, &inblock, ob->command_timeout, buffer, sizeof(buffer)))
2348 {
2349 case 3: ok = TRUE; /* 2xx & 5xx => OK & progress made */
2350 case 2: completed_address = TRUE; /* 5xx (only) => progress made */
2351 break;
2352
2353 case 1: ok = TRUE; /* 2xx (only) => OK, but if LMTP, */
2354 if (!lmtp) completed_address = TRUE; /* can't tell about progress yet */
2355 case 0: break; /* No 2xx or 5xx, but no probs */
2356
2357 case -1: goto END_OFF; /* Timeout on RCPT */
2358 default: goto RESPONSE_FAILED; /* I/O error, or any MAIL/DATA error */
2359 }
2360 }
2361
2362 /* Save the first address of the next batch. */
2363
2364 first_addr = addr;
2365
2366 /* If there were no good recipients (but otherwise there have been no
2367 problems), just set ok TRUE, since we have handled address-specific errors
2368 already. Otherwise, it's OK to send the message. Use the check/escape mechanism
2369 for handling the SMTP dot-handling protocol, flagging to apply to headers as
2370 well as body. Set the appropriate timeout value to be used for each chunk.
2371 (Haven't been able to make it work using select() for writing yet.) */
2372
2373 if (!ok) ok = TRUE; else
2374 {
2375 sigalrm_seen = FALSE;
2376 transport_write_timeout = ob->data_timeout;
2377 smtp_command = US"sending data block"; /* For error messages */
2378 DEBUG(D_transport|D_v)
2379 debug_printf(" SMTP>> writing message and terminating \".\"\n");
2380 transport_count = 0;
2381
2382 #ifndef DISABLE_DKIM
2383 ok = dkim_transport_write_message(addrlist, inblock.sock,
2384 topt_use_crlf | topt_end_dot | topt_escape_headers |
2385 (tblock->body_only? topt_no_headers : 0) |
2386 (tblock->headers_only? topt_no_body : 0) |
2387 (tblock->return_path_add? topt_add_return_path : 0) |
2388 (tblock->delivery_date_add? topt_add_delivery_date : 0) |
2389 (tblock->envelope_to_add? topt_add_envelope_to : 0),
2390 0, /* No size limit */
2391 tblock->add_headers, tblock->remove_headers,
2392 US".", US"..", /* Escaping strings */
2393 tblock->rewrite_rules, tblock->rewrite_existflags,
2394 ob->dkim_private_key, ob->dkim_domain, ob->dkim_selector,
2395 ob->dkim_canon, ob->dkim_strict, ob->dkim_sign_headers
2396 );
2397 #else
2398 ok = transport_write_message(addrlist, inblock.sock,
2399 topt_use_crlf | topt_end_dot | topt_escape_headers |
2400 (tblock->body_only? topt_no_headers : 0) |
2401 (tblock->headers_only? topt_no_body : 0) |
2402 (tblock->return_path_add? topt_add_return_path : 0) |
2403 (tblock->delivery_date_add? topt_add_delivery_date : 0) |
2404 (tblock->envelope_to_add? topt_add_envelope_to : 0),
2405 0, /* No size limit */
2406 tblock->add_headers, tblock->remove_headers,
2407 US".", US"..", /* Escaping strings */
2408 tblock->rewrite_rules, tblock->rewrite_existflags);
2409 #endif
2410
2411 /* transport_write_message() uses write() because it is called from other
2412 places to write to non-sockets. This means that under some OS (e.g. Solaris)
2413 it can exit with "Broken pipe" as its error. This really means that the
2414 socket got closed at the far end. */
2415
2416 transport_write_timeout = 0; /* for subsequent transports */
2417
2418 /* Failure can either be some kind of I/O disaster (including timeout),
2419 or the failure of a transport filter or the expansion of added headers. */
2420
2421 if (!ok)
2422 {
2423 buffer[0] = 0; /* There hasn't been a response */
2424 goto RESPONSE_FAILED;
2425 }
2426
2427 /* We used to send the terminating "." explicitly here, but because of
2428 buffering effects at both ends of TCP/IP connections, you don't gain
2429 anything by keeping it separate, so it might as well go in the final
2430 data buffer for efficiency. This is now done by setting the topt_end_dot
2431 flag above. */
2432
2433 smtp_command = US"end of data";
2434
2435 #ifndef DISABLE_PRDR
2436 /* For PRDR we optionally get a partial-responses warning
2437 * followed by the individual responses, before going on with
2438 * the overall response. If we don't get the warning then deal
2439 * with per non-PRDR. */
2440 if(prdr_active)
2441 {
2442 ok = smtp_read_response(&inblock, buffer, sizeof(buffer), '3',
2443 ob->final_timeout);
2444 if (!ok && errno == 0)
2445 switch(buffer[0])
2446 {
2447 case '2': prdr_active = FALSE;
2448 ok = TRUE;
2449 break;
2450 case '4': errno = ERRNO_DATA4XX;
2451 addrlist->more_errno |= ((buffer[1] - '0')*10 + buffer[2] - '0') << 8;
2452 break;
2453 }
2454 }
2455 else
2456 #endif
2457
2458 /* For non-PRDR SMTP, we now read a single response that applies to the
2459 whole message. If it is OK, then all the addresses have been delivered. */
2460
2461 if (!lmtp)
2462 {
2463 ok = smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
2464 ob->final_timeout);
2465 if (!ok && errno == 0 && buffer[0] == '4')
2466 {
2467 errno = ERRNO_DATA4XX;
2468 addrlist->more_errno |= ((buffer[1] - '0')*10 + buffer[2] - '0') << 8;
2469 }
2470 }
2471
2472 /* For LMTP, we get back a response for every RCPT command that we sent;
2473 some may be accepted and some rejected. For those that get a response, their
2474 status is fixed; any that are accepted have been handed over, even if later
2475 responses crash - at least, that's how I read RFC 2033.
2476
2477 If all went well, mark the recipient addresses as completed, record which
2478 host/IPaddress they were delivered to, and cut out RSET when sending another
2479 message down the same channel. Write the completed addresses to the journal
2480 now so that they are recorded in case there is a crash of hardware or
2481 software before the spool gets updated. Also record the final SMTP
2482 confirmation if needed (for SMTP only). */
2483
2484 if (ok)
2485 {
2486 int flag = '=';
2487 int delivery_time = (int)(time(NULL) - start_delivery_time);
2488 int len;
2489 uschar *conf = NULL;
2490 send_rset = FALSE;
2491
2492 /* Set up confirmation if needed - applies only to SMTP */
2493
2494 if (
2495 #ifdef DISABLE_EVENT
2496 LOGGING(smtp_confirmation) &&
2497 #endif
2498 !lmtp
2499 )
2500 {
2501 const uschar *s = string_printing(buffer);
2502 /* deconst cast ok here as string_printing was checked to have alloc'n'copied */
2503 conf = (s == buffer)? (uschar *)string_copy(s) : US s;
2504 }
2505
2506 /* Process all transported addresses - for LMTP or PRDR, read a status for
2507 each one. */
2508
2509 for (addr = addrlist; addr != first_addr; addr = addr->next)
2510 {
2511 if (addr->transport_return != PENDING_OK) continue;
2512
2513 /* LMTP - if the response fails badly (e.g. timeout), use it for all the
2514 remaining addresses. Otherwise, it's a return code for just the one
2515 address. For temporary errors, add a retry item for the address so that
2516 it doesn't get tried again too soon. */
2517
2518 #ifndef DISABLE_PRDR
2519 if (lmtp || prdr_active)
2520 #else
2521 if (lmtp)
2522 #endif
2523 {
2524 if (!smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
2525 ob->final_timeout))
2526 {
2527 if (errno != 0 || buffer[0] == 0) goto RESPONSE_FAILED;
2528 addr->message = string_sprintf(
2529 #ifndef DISABLE_PRDR
2530 "%s error after %s: %s", prdr_active ? "PRDR":"LMTP",
2531 #else
2532 "LMTP error after %s: %s",
2533 #endif
2534 big_buffer, string_printing(buffer));
2535 setflag(addr, af_pass_message); /* Allow message to go to user */
2536 if (buffer[0] == '5')
2537 addr->transport_return = FAIL;
2538 else
2539 {
2540 errno = ERRNO_DATA4XX;
2541 addr->more_errno |= ((buffer[1] - '0')*10 + buffer[2] - '0') << 8;
2542 addr->transport_return = DEFER;
2543 #ifndef DISABLE_PRDR
2544 if (!prdr_active)
2545 #endif
2546 retry_add_item(addr, addr->address_retry_key, 0);
2547 }
2548 continue;
2549 }
2550 completed_address = TRUE; /* NOW we can set this flag */
2551 if (LOGGING(smtp_confirmation))
2552 {
2553 const uschar *s = string_printing(buffer);
2554 /* deconst cast ok here as string_printing was checked to have alloc'n'copied */
2555 conf = (s == buffer)? (uschar *)string_copy(s) : US s;
2556 }
2557 }
2558
2559 /* SMTP, or success return from LMTP for this address. Pass back the
2560 actual host that was used. */
2561
2562 addr->transport_return = OK;
2563 addr->more_errno = delivery_time;
2564 addr->host_used = host;
2565 addr->special_action = flag;
2566 addr->message = conf;
2567 #ifndef DISABLE_PRDR
2568 if (prdr_active) addr->flags |= af_prdr_used;
2569 #endif
2570 flag = '-';
2571
2572 #ifndef DISABLE_PRDR
2573 if (!prdr_active)
2574 #endif
2575 {
2576 /* Update the journal. For homonymic addresses, use the base address plus
2577 the transport name. See lots of comments in deliver.c about the reasons
2578 for the complications when homonyms are involved. Just carry on after
2579 write error, as it may prove possible to update the spool file later. */
2580
2581 if (testflag(addr, af_homonym))
2582 sprintf(CS buffer, "%.500s/%s\n", addr->unique + 3, tblock->name);
2583 else
2584 sprintf(CS buffer, "%.500s\n", addr->unique);
2585
2586 DEBUG(D_deliver) debug_printf("journalling %s\n", buffer);
2587 len = Ustrlen(CS buffer);
2588 if (write(journal_fd, buffer, len) != len)
2589 log_write(0, LOG_MAIN|LOG_PANIC, "failed to write journal for "
2590 "%s: %s", buffer, strerror(errno));
2591 }
2592 }
2593
2594 #ifndef DISABLE_PRDR
2595 if (prdr_active)
2596 {
2597 /* PRDR - get the final, overall response. For any non-success
2598 upgrade all the address statuses. */
2599 ok = smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
2600 ob->final_timeout);
2601 if (!ok)
2602 {
2603 if(errno == 0 && buffer[0] == '4')
2604 {
2605 errno = ERRNO_DATA4XX;
2606 addrlist->more_errno |= ((buffer[1] - '0')*10 + buffer[2] - '0') << 8;
2607 }
2608 for (addr = addrlist; addr != first_addr; addr = addr->next)
2609 if (buffer[0] == '5' || addr->transport_return == OK)
2610 addr->transport_return = PENDING_OK; /* allow set_errno action */
2611 goto RESPONSE_FAILED;
2612 }
2613
2614 /* Update the journal, or setup retry. */
2615 for (addr = addrlist; addr != first_addr; addr = addr->next)
2616 if (addr->transport_return == OK)
2617 {
2618 if (testflag(addr, af_homonym))
2619 sprintf(CS buffer, "%.500s/%s\n", addr->unique + 3, tblock->name);
2620 else
2621 sprintf(CS buffer, "%.500s\n", addr->unique);
2622
2623 DEBUG(D_deliver) debug_printf("journalling(PRDR) %s\n", buffer);
2624 len = Ustrlen(CS buffer);
2625 if (write(journal_fd, buffer, len) != len)
2626 log_write(0, LOG_MAIN|LOG_PANIC, "failed to write journal for "
2627 "%s: %s", buffer, strerror(errno));
2628 }
2629 else if (addr->transport_return == DEFER)
2630 retry_add_item(addr, addr->address_retry_key, -2);
2631 }
2632 #endif
2633
2634 /* Ensure the journal file is pushed out to disk. */
2635
2636 if (EXIMfsync(journal_fd) < 0)
2637 log_write(0, LOG_MAIN|LOG_PANIC, "failed to fsync journal: %s",
2638 strerror(errno));
2639 }
2640 }
2641
2642
2643 /* Handle general (not specific to one address) failures here. The value of ok
2644 is used to skip over this code on the falling through case. A timeout causes a
2645 deferral. Other errors may defer or fail according to the response code, and
2646 may set up a special errno value, e.g. after connection chopped, which is
2647 assumed if errno == 0 and there is no text in the buffer. If control reaches
2648 here during the setting up phase (i.e. before MAIL FROM) then always defer, as
2649 the problem is not related to this specific message. */
2650
2651 if (!ok)
2652 {
2653 int code, set_rc;
2654 uschar * set_message;
2655
2656 RESPONSE_FAILED:
2657 {
2658 save_errno = errno;
2659 message = NULL;
2660 send_quit = check_response(host, &save_errno, addrlist->more_errno,
2661 buffer, &code, &message, &pass_message);
2662 goto FAILED;
2663 }
2664
2665 SEND_FAILED:
2666 {
2667 save_errno = errno;
2668 code = '4';
2669 message = US string_sprintf("send() to %s [%s] failed: %s",
2670 host->name, host->address, strerror(save_errno));
2671 send_quit = FALSE;
2672 goto FAILED;
2673 }
2674
2675 /* This label is jumped to directly when a TLS negotiation has failed,
2676 or was not done for a host for which it is required. Values will be set
2677 in message and save_errno, and setting_up will always be true. Treat as
2678 a temporary error. */
2679
2680 #ifdef SUPPORT_TLS
2681 TLS_FAILED:
2682 code = '4';
2683 #endif
2684
2685 /* If the failure happened while setting up the call, see if the failure was
2686 a 5xx response (this will either be on connection, or following HELO - a 5xx
2687 after EHLO causes it to try HELO). If so, fail all addresses, as this host is
2688 never going to accept them. For other errors during setting up (timeouts or
2689 whatever), defer all addresses, and yield DEFER, so that the host is not
2690 tried again for a while. */
2691
2692 FAILED:
2693 ok = FALSE; /* For when reached by GOTO */
2694 set_message = message;
2695
2696 if (setting_up)
2697 {
2698 if (code == '5')
2699 set_rc = FAIL;
2700 else
2701 yield = set_rc = DEFER;
2702 }
2703
2704 /* We want to handle timeouts after MAIL or "." and loss of connection after
2705 "." specially. They can indicate a problem with the sender address or with
2706 the contents of the message rather than a real error on the connection. These
2707 cases are treated in the same way as a 4xx response. This next bit of code
2708 does the classification. */
2709
2710 else
2711 {
2712 BOOL message_error;
2713
2714 switch(save_errno)
2715 {
2716 #ifdef SUPPORT_I18N
2717 case ERRNO_UTF8_FWD:
2718 code = '5';
2719 /*FALLTHROUGH*/
2720 #endif
2721 case 0:
2722 case ERRNO_MAIL4XX:
2723 case ERRNO_DATA4XX:
2724 message_error = TRUE;
2725 break;
2726
2727 case ETIMEDOUT:
2728 message_error = Ustrncmp(smtp_command,"MAIL",4) == 0 ||
2729 Ustrncmp(smtp_command,"end ",4) == 0;
2730 break;
2731
2732 case ERRNO_SMTPCLOSED:
2733 message_error = Ustrncmp(smtp_command,"end ",4) == 0;
2734 break;
2735
2736 default:
2737 message_error = FALSE;
2738 break;
2739 }
2740
2741 /* Handle the cases that are treated as message errors. These are:
2742
2743 (a) negative response or timeout after MAIL
2744 (b) negative response after DATA
2745 (c) negative response or timeout or dropped connection after "."
2746 (d) utf8 support required and not offered
2747
2748 It won't be a negative response or timeout after RCPT, as that is dealt
2749 with separately above. The action in all cases is to set an appropriate
2750 error code for all the addresses, but to leave yield set to OK because the
2751 host itself has not failed. Of course, it might in practice have failed
2752 when we've had a timeout, but if so, we'll discover that at the next
2753 delivery attempt. For a temporary error, set the message_defer flag, and
2754 write to the logs for information if this is not the last host. The error
2755 for the last host will be logged as part of the address's log line. */
2756
2757 if (message_error)
2758 {
2759 if (mua_wrapper) code = '5'; /* Force hard failure in wrapper mode */
2760
2761 /* If there's an errno, the message contains just the identity of
2762 the host. */
2763
2764 if (code == '5')
2765 set_rc = FAIL;
2766 else /* Anything other than 5 is treated as temporary */
2767 {
2768 set_rc = DEFER;
2769 if (save_errno > 0)
2770 message = US string_sprintf("%s: %s", message, strerror(save_errno));
2771 if (host->next != NULL) log_write(0, LOG_MAIN, "%s", message);
2772 msglog_line(host, message);
2773 *message_defer = TRUE;
2774 }
2775 }
2776
2777 /* Otherwise, we have an I/O error or a timeout other than after MAIL or
2778 ".", or some other transportation error. We defer all addresses and yield
2779 DEFER, except for the case of failed add_headers expansion, or a transport
2780 filter failure, when the yield should be ERROR, to stop it trying other
2781 hosts. */
2782
2783 else
2784 {
2785 set_rc = DEFER;
2786 yield = (save_errno == ERRNO_CHHEADER_FAIL ||
2787 save_errno == ERRNO_FILTER_FAIL)? ERROR : DEFER;
2788 }
2789 }
2790
2791 set_errno(addrlist, save_errno, set_message, set_rc, pass_message, host
2792 #ifdef EXPERIMENTAL_DSN_INFO
2793 , smtp_greeting, helo_response
2794 #endif
2795 );
2796 }
2797
2798
2799 /* If all has gone well, send_quit will be set TRUE, implying we can end the
2800 SMTP session tidily. However, if there were too many addresses to send in one
2801 message (indicated by first_addr being non-NULL) we want to carry on with the
2802 rest of them. Also, it is desirable to send more than one message down the SMTP
2803 connection if there are several waiting, provided we haven't already sent so
2804 many as to hit the configured limit. The function transport_check_waiting looks
2805 for a waiting message and returns its id. Then transport_pass_socket tries to
2806 set up a continued delivery by passing the socket on to another process. The
2807 variable send_rset is FALSE if a message has just been successfully transfered.
2808
2809 If we are already sending down a continued channel, there may be further
2810 addresses not yet delivered that are aimed at the same host, but which have not
2811 been passed in this run of the transport. In this case, continue_more will be
2812 true, and all we should do is send RSET if necessary, and return, leaving the
2813 channel open.
2814
2815 However, if no address was disposed of, i.e. all addresses got 4xx errors, we
2816 do not want to continue with other messages down the same channel, because that
2817 can lead to looping between two or more messages, all with the same,
2818 temporarily failing address(es). [The retry information isn't updated yet, so
2819 new processes keep on trying.] We probably also don't want to try more of this
2820 message's addresses either.
2821
2822 If we have started a TLS session, we have to end it before passing the
2823 connection to a new process. However, not all servers can handle this (Exim
2824 can), so we do not pass such a connection on if the host matches
2825 hosts_nopass_tls. */
2826
2827 DEBUG(D_transport)
2828 debug_printf("ok=%d send_quit=%d send_rset=%d continue_more=%d "
2829 "yield=%d first_address is %sNULL\n", ok, send_quit, send_rset,
2830 continue_more, yield, (first_addr == NULL)? "":"not ");
2831
2832 if (completed_address && ok && send_quit)
2833 {
2834 BOOL more;
2835 smtp_compare_t t_compare;
2836
2837 t_compare.tblock = tblock;
2838 t_compare.current_sender_address = sender_address;
2839
2840 if ( first_addr != NULL
2841 || continue_more
2842 || ( ( tls_out.active < 0
2843 || verify_check_given_host(&ob->hosts_nopass_tls, host) != OK
2844 )
2845 &&
2846 transport_check_waiting(tblock->name, host->name,
2847 tblock->connection_max_messages, new_message_id, &more,
2848 (oicf)smtp_are_same_identities, (void*)&t_compare)
2849 ) )
2850 {
2851 uschar *msg;
2852 BOOL pass_message;
2853
2854 if (send_rset)
2855 {
2856 if (! (ok = smtp_write_command(&outblock, FALSE, "RSET\r\n") >= 0))
2857 {
2858 msg = US string_sprintf("send() to %s [%s] failed: %s", host->name,
2859 host->address, strerror(save_errno));
2860 send_quit = FALSE;
2861 }
2862 else if (! (ok = smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
2863 ob->command_timeout)))
2864 {
2865 int code;
2866 send_quit = check_response(host, &errno, 0, buffer, &code, &msg,
2867 &pass_message);
2868 if (!send_quit)
2869 {
2870 DEBUG(D_transport) debug_printf("H=%s [%s] %s\n",
2871 host->name, host->address, msg);
2872 }
2873 }
2874 }
2875
2876 /* Either RSET was not needed, or it succeeded */
2877
2878 if (ok)
2879 {
2880 if (first_addr != NULL) /* More addresses still to be sent */
2881 { /* in this run of the transport */
2882 continue_sequence++; /* Causes * in logging */
2883 goto SEND_MESSAGE;
2884 }
2885 if (continue_more) return yield; /* More addresses for another run */
2886
2887 /* Pass the socket to a new Exim process. Before doing so, we must shut
2888 down TLS. Not all MTAs allow for the continuation of the SMTP session
2889 when TLS is shut down. We test for this by sending a new EHLO. If we
2890 don't get a good response, we don't attempt to pass the socket on. */
2891
2892 #ifdef SUPPORT_TLS
2893 if (tls_out.active >= 0)
2894 {
2895 tls_close(FALSE, TRUE);
2896 if (smtps)
2897 ok = FALSE;
2898 else
2899 ok = smtp_write_command(&outblock,FALSE,"EHLO %s\r\n",helo_data) >= 0 &&
2900 smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
2901 ob->command_timeout);
2902 }
2903 #endif
2904
2905 /* If the socket is successfully passed, we musn't send QUIT (or
2906 indeed anything!) from here. */
2907
2908 /*XXX DSN_INFO: assume likely to do new HELO; but for greet we'll want to
2909 propagate it from the initial
2910 */
2911 if (ok && transport_pass_socket(tblock->name, host->name, host->address,
2912 new_message_id, inblock.sock))
2913 {
2914 send_quit = FALSE;
2915 }
2916 }
2917
2918 /* If RSET failed and there are addresses left, they get deferred. */
2919
2920 else set_errno(first_addr, errno, msg, DEFER, FALSE, host
2921 #ifdef EXPERIMENTAL_DSN_INFO
2922 , smtp_greeting, helo_response
2923 #endif
2924 );
2925 }
2926 }
2927
2928 /* End off tidily with QUIT unless the connection has died or the socket has
2929 been passed to another process. There has been discussion on the net about what
2930 to do after sending QUIT. The wording of the RFC suggests that it is necessary
2931 to wait for a response, but on the other hand, there isn't anything one can do
2932 with an error response, other than log it. Exim used to do that. However,
2933 further discussion suggested that it is positively advantageous not to wait for
2934 the response, but to close the session immediately. This is supposed to move
2935 the TCP/IP TIME_WAIT state from the server to the client, thereby removing some
2936 load from the server. (Hosts that are both servers and clients may not see much
2937 difference, of course.) Further discussion indicated that this was safe to do
2938 on Unix systems which have decent implementations of TCP/IP that leave the
2939 connection around for a while (TIME_WAIT) after the application has gone away.
2940 This enables the response sent by the server to be properly ACKed rather than
2941 timed out, as can happen on broken TCP/IP implementations on other OS.
2942
2943 This change is being made on 31-Jul-98. After over a year of trouble-free
2944 operation, the old commented-out code was removed on 17-Sep-99. */
2945
2946 SEND_QUIT:
2947 if (send_quit) (void)smtp_write_command(&outblock, FALSE, "QUIT\r\n");
2948
2949 END_OFF:
2950
2951 #ifdef SUPPORT_TLS
2952 tls_close(FALSE, TRUE);
2953 #endif
2954
2955 /* Close the socket, and return the appropriate value, first setting
2956 works because the NULL setting is passed back to the calling process, and
2957 remote_max_parallel is forced to 1 when delivering over an existing connection,
2958
2959 If all went well and continue_more is set, we shouldn't actually get here if
2960 there are further addresses, as the return above will be taken. However,
2961 writing RSET might have failed, or there may be other addresses whose hosts are
2962 specified in the transports, and therefore not visible at top level, in which
2963 case continue_more won't get set. */
2964
2965 HDEBUG(D_transport|D_acl|D_v) debug_printf(" SMTP(close)>>\n");
2966 (void)close(inblock.sock);
2967
2968 #ifndef DISABLE_EVENT
2969 (void) event_raise(tblock->event_action, US"tcp:close", NULL);
2970 #endif
2971
2972 continue_transport = NULL;
2973 continue_hostname = NULL;
2974 return yield;
2975 }
2976
2977
2978
2979
2980 /*************************************************
2981 * Closedown entry point *
2982 *************************************************/
2983
2984 /* This function is called when exim is passed an open smtp channel
2985 from another incarnation, but the message which it has been asked
2986 to deliver no longer exists. The channel is on stdin.
2987
2988 We might do fancy things like looking for another message to send down
2989 the channel, but if the one we sought has gone, it has probably been
2990 delivered by some other process that itself will seek further messages,
2991 so just close down our connection.
2992
2993 Argument: pointer to the transport instance block
2994 Returns: nothing
2995 */
2996
2997 void
2998 smtp_transport_closedown(transport_instance *tblock)
2999 {
3000 smtp_transport_options_block *ob =
3001 (smtp_transport_options_block *)(tblock->options_block);
3002 smtp_inblock inblock;
3003 smtp_outblock outblock;
3004 uschar buffer[256];
3005 uschar inbuffer[4096];
3006 uschar outbuffer[16];
3007
3008 inblock.sock = fileno(stdin);
3009 inblock.buffer = inbuffer;
3010 inblock.buffersize = sizeof(inbuffer);
3011 inblock.ptr = inbuffer;
3012 inblock.ptrend = inbuffer;
3013
3014 outblock.sock = inblock.sock;
3015 outblock.buffersize = sizeof(outbuffer);
3016 outblock.buffer = outbuffer;
3017 outblock.ptr = outbuffer;
3018 outblock.cmd_count = 0;
3019 outblock.authenticating = FALSE;
3020
3021 (void)smtp_write_command(&outblock, FALSE, "QUIT\r\n");
3022 (void)smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
3023 ob->command_timeout);
3024 (void)close(inblock.sock);
3025 }
3026
3027
3028
3029 /*************************************************
3030 * Prepare addresses for delivery *
3031 *************************************************/
3032
3033 /* This function is called to flush out error settings from previous delivery
3034 attempts to other hosts. It also records whether we got here via an MX record
3035 or not in the more_errno field of the address. We are interested only in
3036 addresses that are still marked DEFER - others may have got delivered to a
3037 previously considered IP address. Set their status to PENDING_DEFER to indicate
3038 which ones are relevant this time.
3039
3040 Arguments:
3041 addrlist the list of addresses
3042 host the host we are delivering to
3043
3044 Returns: the first address for this delivery
3045 */
3046
3047 static address_item *
3048 prepare_addresses(address_item *addrlist, host_item *host)
3049 {
3050 address_item *first_addr = NULL;
3051 address_item *addr;
3052 for (addr = addrlist; addr != NULL; addr = addr->next)
3053 if (addr->transport_return == DEFER)
3054 {
3055 if (first_addr == NULL) first_addr = addr;
3056 addr->transport_return = PENDING_DEFER;
3057 addr->basic_errno = 0;
3058 addr->more_errno = (host->mx >= 0)? 'M' : 'A';
3059 addr->message = NULL;
3060 #ifdef SUPPORT_TLS
3061 addr->cipher = NULL;
3062 addr->ourcert = NULL;
3063 addr->peercert = NULL;
3064 addr->peerdn = NULL;
3065 addr->ocsp = OCSP_NOT_REQ;
3066 #endif
3067 #ifdef EXPERIMENTAL_DSN_INFO
3068 addr->smtp_greeting = NULL;
3069 addr->helo_response = NULL;
3070 #endif
3071 }
3072 return first_addr;
3073 }
3074
3075
3076
3077 /*************************************************
3078 * Main entry point *
3079 *************************************************/
3080
3081 /* See local README for interface details. As this is a remote transport, it is
3082 given a chain of addresses to be delivered in one connection, if possible. It
3083 always returns TRUE, indicating that each address has its own independent
3084 status set, except if there is a setting up problem, in which case it returns
3085 FALSE. */
3086
3087 BOOL
3088 smtp_transport_entry(
3089 transport_instance *tblock, /* data for this instantiation */
3090 address_item *addrlist) /* addresses we are working on */
3091 {
3092 int cutoff_retry;
3093 int port;
3094 int hosts_defer = 0;
3095 int hosts_fail = 0;
3096 int hosts_looked_up = 0;
3097 int hosts_retry = 0;
3098 int hosts_serial = 0;
3099 int hosts_total = 0;
3100 int total_hosts_tried = 0;
3101 address_item *addr;
3102 BOOL expired = TRUE;
3103 BOOL continuing = continue_hostname != NULL;
3104 uschar *expanded_hosts = NULL;
3105 uschar *pistring;
3106 uschar *tid = string_sprintf("%s transport", tblock->name);
3107 smtp_transport_options_block *ob =
3108 (smtp_transport_options_block *)(tblock->options_block);
3109 host_item *hostlist = addrlist->host_list;
3110 host_item *host = NULL;
3111
3112 DEBUG(D_transport)
3113 {
3114 debug_printf("%s transport entered\n", tblock->name);
3115 for (addr = addrlist; addr != NULL; addr = addr->next)
3116 debug_printf(" %s\n", addr->address);
3117 if (continuing) debug_printf("already connected to %s [%s]\n",
3118 continue_hostname, continue_host_address);
3119 }
3120
3121 /* Set the flag requesting that these hosts be added to the waiting
3122 database if the delivery fails temporarily or if we are running with
3123 queue_smtp or a 2-stage queue run. This gets unset for certain
3124 kinds of error, typically those that are specific to the message. */
3125
3126 update_waiting = TRUE;
3127
3128 /* If a host list is not defined for the addresses - they must all have the
3129 same one in order to be passed to a single transport - or if the transport has
3130 a host list with hosts_override set, use the host list supplied with the
3131 transport. It is an error for this not to exist. */
3132
3133 if (hostlist == NULL || (ob->hosts_override && ob->hosts != NULL))
3134 {
3135 if (ob->hosts == NULL)
3136 {
3137 addrlist->message = string_sprintf("%s transport called with no hosts set",
3138 tblock->name);
3139 addrlist->transport_return = PANIC;
3140 return FALSE; /* Only top address has status */
3141 }
3142
3143 DEBUG(D_transport) debug_printf("using the transport's hosts: %s\n",
3144 ob->hosts);
3145
3146 /* If the transport's host list contains no '$' characters, and we are not
3147 randomizing, it is fixed and therefore a chain of hosts can be built once
3148 and for all, and remembered for subsequent use by other calls to this
3149 transport. If, on the other hand, the host list does contain '$', or we are
3150 randomizing its order, we have to rebuild it each time. In the fixed case,
3151 as the hosts string will never be used again, it doesn't matter that we
3152 replace all the : characters with zeros. */
3153
3154 if (ob->hostlist == NULL)
3155 {
3156 uschar *s = ob->hosts;
3157
3158 if (Ustrchr(s, '$') != NULL)
3159 {
3160 if (!(expanded_hosts = expand_string(s)))
3161 {
3162 addrlist->message = string_sprintf("failed to expand list of hosts "
3163 "\"%s\" in %s transport: %s", s, tblock->name, expand_string_message);
3164 addrlist->transport_return = search_find_defer? DEFER : PANIC;
3165 return FALSE; /* Only top address has status */
3166 }
3167 DEBUG(D_transport) debug_printf("expanded list of hosts \"%s\" to "
3168 "\"%s\"\n", s, expanded_hosts);
3169 s = expanded_hosts;
3170 }
3171 else
3172 if (ob->hosts_randomize) s = expanded_hosts = string_copy(s);
3173
3174 host_build_hostlist(&hostlist, s, ob->hosts_randomize);
3175
3176 /* Check that the expansion yielded something useful. */
3177 if (hostlist == NULL)
3178 {
3179 addrlist->message =
3180 string_sprintf("%s transport has empty hosts setting", tblock->name);
3181 addrlist->transport_return = PANIC;
3182 return FALSE; /* Only top address has status */
3183 }
3184
3185 /* If there was no expansion of hosts, save the host list for
3186 next time. */
3187
3188 if (!expanded_hosts) ob->hostlist = hostlist;
3189 }
3190
3191 /* This is not the first time this transport has been run in this delivery;
3192 the host list was built previously. */
3193
3194 else
3195 hostlist = ob->hostlist;
3196 }
3197
3198 /* The host list was supplied with the address. If hosts_randomize is set, we
3199 must sort it into a random order if it did not come from MX records and has not
3200 already been randomized (but don't bother if continuing down an existing
3201 connection). */
3202
3203 else if (ob->hosts_randomize && hostlist->mx == MX_NONE && !continuing)
3204 {
3205 host_item *newlist = NULL;
3206 while (hostlist != NULL)
3207 {
3208 host_item *h = hostlist;
3209 hostlist = hostlist->next;
3210
3211 h->sort_key = random_number(100);
3212
3213 if (newlist == NULL)
3214 {
3215 h->next = NULL;
3216 newlist = h;
3217 }
3218 else if (h->sort_key < newlist->sort_key)
3219 {
3220 h->next = newlist;
3221 newlist = h;
3222 }
3223 else
3224 {
3225 host_item *hh = newlist;
3226 while (hh->next != NULL)
3227 {
3228 if (h->sort_key < hh->next->sort_key) break;
3229 hh = hh->next;
3230 }
3231 h->next = hh->next;
3232 hh->next = h;
3233 }
3234 }
3235
3236 hostlist = addrlist->host_list = newlist;
3237 }
3238
3239 /* Sort out the default port. */
3240
3241 if (!smtp_get_port(ob->port, addrlist, &port, tid)) return FALSE;
3242
3243 /* For each host-plus-IP-address on the list:
3244
3245 . If this is a continued delivery and the host isn't the one with the
3246 current connection, skip.
3247
3248 . If the status is unusable (i.e. previously failed or retry checked), skip.
3249
3250 . If no IP address set, get the address, either by turning the name into
3251 an address, calling gethostbyname if gethostbyname is on, or by calling
3252 the DNS. The DNS may yield multiple addresses, in which case insert the
3253 extra ones into the list.
3254
3255 . Get the retry data if not previously obtained for this address and set the
3256 field which remembers the state of this address. Skip if the retry time is
3257 not reached. If not, remember whether retry data was found. The retry string
3258 contains both the name and the IP address.
3259
3260 . Scan the list of addresses and mark those whose status is DEFER as
3261 PENDING_DEFER. These are the only ones that will be processed in this cycle
3262 of the hosts loop.
3263
3264 . Make a delivery attempt - addresses marked PENDING_DEFER will be tried.
3265 Some addresses may be successfully delivered, others may fail, and yet
3266 others may get temporary errors and so get marked DEFER.
3267
3268 . The return from the delivery attempt is OK if a connection was made and a
3269 valid SMTP dialogue was completed. Otherwise it is DEFER.
3270
3271 . If OK, add a "remove" retry item for this host/IPaddress, if any.
3272
3273 . If fail to connect, or other defer state, add a retry item.
3274
3275 . If there are any addresses whose status is still DEFER, carry on to the
3276 next host/IPaddress, unless we have tried the number of hosts given
3277 by hosts_max_try or hosts_max_try_hardlimit; otherwise return. Note that
3278 there is some fancy logic for hosts_max_try that means its limit can be
3279 overstepped in some circumstances.
3280
3281 If we get to the end of the list, all hosts have deferred at least one address,
3282 or not reached their retry times. If delay_after_cutoff is unset, it requests a
3283 delivery attempt to those hosts whose last try was before the arrival time of
3284 the current message. To cope with this, we have to go round the loop a second
3285 time. After that, set the status and error data for any addresses that haven't
3286 had it set already. */
3287
3288 for (cutoff_retry = 0; expired &&
3289 cutoff_retry < ((ob->delay_after_cutoff)? 1 : 2);
3290 cutoff_retry++)
3291 {
3292 host_item *nexthost = NULL;
3293 int unexpired_hosts_tried = 0;
3294
3295 for (host = hostlist;
3296 host != NULL &&
3297 unexpired_hosts_tried < ob->hosts_max_try &&
3298 total_hosts_tried < ob->hosts_max_try_hardlimit;
3299 host = nexthost)
3300 {
3301 int rc;
3302 int host_af;
3303 uschar *rs;
3304 BOOL serialized = FALSE;
3305 BOOL host_is_expired = FALSE;
3306 BOOL message_defer = FALSE;
3307 BOOL some_deferred = FALSE;
3308 address_item *first_addr = NULL;
3309 uschar *interface = NULL;
3310 uschar *retry_host_key = NULL;
3311 uschar *retry_message_key = NULL;
3312 uschar *serialize_key = NULL;
3313
3314 /* Default next host is next host. :-) But this can vary if the
3315 hosts_max_try limit is hit (see below). It may also be reset if a host
3316 address is looked up here (in case the host was multihomed). */
3317
3318 nexthost = host->next;
3319
3320 /* If the address hasn't yet been obtained from the host name, look it up
3321 now, unless the host is already marked as unusable. If it is marked as
3322 unusable, it means that the router was unable to find its IP address (in
3323 the DNS or wherever) OR we are in the 2nd time round the cutoff loop, and
3324 the lookup failed last time. We don't get this far if *all* MX records
3325 point to non-existent hosts; that is treated as a hard error.
3326
3327 We can just skip this host entirely. When the hosts came from the router,
3328 the address will timeout based on the other host(s); when the address is
3329 looked up below, there is an explicit retry record added.
3330
3331 Note that we mustn't skip unusable hosts if the address is not unset; they
3332 may be needed as expired hosts on the 2nd time round the cutoff loop. */
3333
3334 if (host->address == NULL)
3335 {
3336 int new_port, flags;
3337 host_item *hh;
3338
3339 if (host->status >= hstatus_unusable)
3340 {
3341 DEBUG(D_transport) debug_printf("%s has no address and is unusable - skipping\n",
3342 host->name);
3343 continue;
3344 }
3345
3346 DEBUG(D_transport) debug_printf("getting address for %s\n", host->name);
3347
3348 /* The host name is permitted to have an attached port. Find it, and
3349 strip it from the name. Just remember it for now. */
3350
3351 new_port = host_item_get_port(host);
3352
3353 /* Count hosts looked up */
3354
3355 hosts_looked_up++;
3356
3357 /* Find by name if so configured, or if it's an IP address. We don't
3358 just copy the IP address, because we need the test-for-local to happen. */
3359
3360 flags = HOST_FIND_BY_A;
3361 if (ob->dns_qualify_single) flags |= HOST_FIND_QUALIFY_SINGLE;
3362 if (ob->dns_search_parents) flags |= HOST_FIND_SEARCH_PARENTS;
3363
3364 if (ob->gethostbyname || string_is_ip_address(host->name, NULL) != 0)
3365 rc = host_find_byname(host, NULL, flags, NULL, TRUE);
3366 else
3367 rc = host_find_bydns(host, NULL, flags, NULL, NULL, NULL,
3368 &ob->dnssec, /* domains for request/require */
3369 NULL, NULL);
3370
3371 /* Update the host (and any additional blocks, resulting from
3372 multihoming) with a host-specific port, if any. */
3373
3374 for (hh = host; hh != nexthost; hh = hh->next) hh->port = new_port;
3375
3376 /* Failure to find the host at this time (usually DNS temporary failure)
3377 is really a kind of routing failure rather than a transport failure.
3378 Therefore we add a retry item of the routing kind, not to stop us trying
3379 to look this name up here again, but to ensure the address gets timed
3380 out if the failures go on long enough. A complete failure at this point
3381 commonly points to a configuration error, but the best action is still
3382 to carry on for the next host. */
3383
3384 if (rc == HOST_FIND_AGAIN || rc == HOST_FIND_FAILED)
3385 {
3386 retry_add_item(addrlist, string_sprintf("R:%s", host->name), 0);
3387 expired = FALSE;
3388 if (rc == HOST_FIND_AGAIN) hosts_defer++; else hosts_fail++;
3389 DEBUG(D_transport) debug_printf("rc = %s for %s\n", (rc == HOST_FIND_AGAIN)?
3390 "HOST_FIND_AGAIN" : "HOST_FIND_FAILED", host->name);
3391 host->status = hstatus_unusable;
3392
3393 for (addr = addrlist; addr != NULL; addr = addr->next)
3394 {
3395 if (addr->transport_return != DEFER) continue;
3396 addr->basic_errno = ERRNO_UNKNOWNHOST;
3397 addr->message =
3398 string_sprintf("failed to lookup IP address for %s", host->name);
3399 }
3400 continue;
3401 }
3402
3403 /* If the host is actually the local host, we may have a problem, or
3404 there may be some cunning configuration going on. In the problem case,
3405 log things and give up. The default transport status is already DEFER. */
3406
3407 if (rc == HOST_FOUND_LOCAL && !ob->allow_localhost)
3408 {
3409 for (addr = addrlist; addr != NULL; addr = addr->next)
3410 {
3411 addr->basic_errno = 0;
3412 addr->message = string_sprintf("%s transport found host %s to be "
3413 "local", tblock->name, host->name);
3414 }
3415 goto END_TRANSPORT;
3416 }
3417 } /* End of block for IP address lookup */
3418
3419 /* If this is a continued delivery, we are interested only in the host
3420 which matches the name of the existing open channel. The check is put
3421 here after the local host lookup, in case the name gets expanded as a
3422 result of the lookup. Set expired FALSE, to save the outer loop executing
3423 twice. */
3424
3425 if (continuing && (Ustrcmp(continue_hostname, host->name) != 0 ||
3426 Ustrcmp(continue_host_address, host->address) != 0))
3427 {
3428 expired = FALSE;
3429 continue; /* With next host */
3430 }
3431
3432 /* Reset the default next host in case a multihomed host whose addresses
3433 are not looked up till just above added to the host list. */
3434
3435 nexthost = host->next;
3436
3437 /* If queue_smtp is set (-odqs or the first part of a 2-stage run), or the
3438 domain is in queue_smtp_domains, we don't actually want to attempt any
3439 deliveries. When doing a queue run, queue_smtp_domains is always unset. If
3440 there is a lookup defer in queue_smtp_domains, proceed as if the domain
3441 were not in it. We don't want to hold up all SMTP deliveries! Except when
3442 doing a two-stage queue run, don't do this if forcing. */
3443
3444 if ((!deliver_force || queue_2stage) && (queue_smtp ||
3445 match_isinlist(addrlist->domain,
3446 (const uschar **)&queue_smtp_domains, 0,
3447 &domainlist_anchor, NULL, MCL_DOMAIN, TRUE, NULL) == OK))
3448 {
3449 expired = FALSE;
3450 for (addr = addrlist; addr != NULL; addr = addr->next)
3451 {
3452 if (addr->transport_return != DEFER) continue;
3453 addr->message = US"domain matches queue_smtp_domains, or -odqs set";
3454 }
3455 continue; /* With next host */
3456 }
3457
3458 /* Count hosts being considered - purely for an intelligent comment
3459 if none are usable. */
3460
3461 hosts_total++;
3462
3463 /* Set $host and $host address now in case they are needed for the
3464 interface expansion or the serialize_hosts check; they remain set if an
3465 actual delivery happens. */
3466
3467 deliver_host = host->name;
3468 deliver_host_address = host->address;
3469 lookup_dnssec_authenticated = host->dnssec == DS_YES ? US"yes"
3470 : host->dnssec == DS_NO ? US"no"
3471 : US"";
3472
3473 /* Set up a string for adding to the retry key if the port number is not
3474 the standard SMTP port. A host may have its own port setting that overrides
3475 the default. */
3476
3477 pistring = string_sprintf(":%d", (host->port == PORT_NONE)?
3478 port : host->port);
3479 if (Ustrcmp(pistring, ":25") == 0) pistring = US"";
3480
3481 /* Select IPv4 or IPv6, and choose an outgoing interface. If the interface
3482 string is set, even if constant (as different transports can have different
3483 constant settings), we must add it to the key that is used for retries,
3484 because connections to the same host from a different interface should be
3485 treated separately. */
3486
3487 host_af = (Ustrchr(host->address, ':') == NULL)? AF_INET : AF_INET6;
3488 if ((rs = ob->interface) && *rs)
3489 {
3490 if (!smtp_get_interface(rs, host_af, addrlist, &interface, tid))
3491 return FALSE;
3492 pistring = string_sprintf("%s/%s", pistring, interface);
3493 }
3494
3495 /* The first time round the outer loop, check the status of the host by
3496 inspecting the retry data. The second time round, we are interested only
3497 in expired hosts that haven't been tried since this message arrived. */
3498
3499 if (cutoff_retry == 0)
3500 {
3501 BOOL incl_ip;
3502 /* Ensure the status of the address is set by checking retry data if
3503 necessary. There may be host-specific retry data (applicable to all
3504 messages) and also data for retries of a specific message at this host.
3505 If either of these retry records are actually read, the keys used are
3506 returned to save recomputing them later. */
3507
3508 if (exp_bool(addrlist, US"transport", tblock->name, D_transport,
3509 US"retry_include_ip_address", ob->retry_include_ip_address,
3510 ob->expand_retry_include_ip_address, &incl_ip) != OK)
3511 continue; /* with next host */
3512
3513 host_is_expired = retry_check_address(addrlist->domain, host, pistring,
3514 incl_ip, &retry_host_key, &retry_message_key);
3515
3516 DEBUG(D_transport) debug_printf("%s [%s]%s status = %s\n", host->name,
3517 (host->address == NULL)? US"" : host->address, pistring,
3518 (host->status == hstatus_usable)? "usable" :
3519 (host->status == hstatus_unusable)? "unusable" :
3520 (host->status == hstatus_unusable_expired)? "unusable (expired)" : "?");
3521
3522 /* Skip this address if not usable at this time, noting if it wasn't
3523 actually expired, both locally and in the address. */
3524
3525 switch (host->status)
3526 {
3527 case hstatus_unusable:
3528 expired = FALSE;
3529 setflag(addrlist, af_retry_skipped);
3530 /* Fall through */
3531
3532 case hstatus_unusable_expired:
3533 switch (host->why)
3534 {
3535 case hwhy_retry: hosts_retry++; break;
3536 case hwhy_failed: hosts_fail++; break;
3537 case hwhy_deferred: hosts_defer++; break;
3538 }
3539
3540 /* If there was a retry message key, implying that previously there
3541 was a message-specific defer, we don't want to update the list of
3542 messages waiting for these hosts. */
3543
3544 if (retry_message_key != NULL) update_waiting = FALSE;
3545 continue; /* With the next host or IP address */
3546 }
3547 }
3548
3549 /* Second time round the loop: if the address is set but expired, and
3550 the message is newer than the last try, let it through. */
3551
3552 else
3553 {
3554 if (host->address == NULL ||
3555 host->status != hstatus_unusable_expired ||
3556 host->last_try > received_time)
3557 continue;
3558 DEBUG(D_transport)
3559 debug_printf("trying expired host %s [%s]%s\n",
3560 host->name, host->address, pistring);
3561 host_is_expired = TRUE;
3562 }
3563
3564 /* Setting "expired=FALSE" doesn't actually mean not all hosts are expired;
3565 it remains TRUE only if all hosts are expired and none are actually tried.
3566 */
3567
3568 expired = FALSE;
3569
3570 /* If this host is listed as one to which access must be serialized,
3571 see if another Exim process has a connection to it, and if so, skip
3572 this host. If not, update the database to record our connection to it
3573 and remember this for later deletion. Do not do any of this if we are
3574 sending the message down a pre-existing connection. */
3575
3576 if (!continuing &&
3577 verify_check_given_host(&ob->serialize_hosts, host) == OK)
3578 {
3579 serialize_key = string_sprintf("host-serialize-%s", host->name);
3580 if (!enq_start(serialize_key, 1))
3581 {
3582 DEBUG(D_transport)
3583 debug_printf("skipping host %s because another Exim process "
3584 "is connected to it\n", host->name);
3585 hosts_serial++;
3586 continue;
3587 }
3588 serialized = TRUE;
3589 }
3590
3591 /* OK, we have an IP address that is not waiting for its retry time to
3592 arrive (it might be expired) OR (second time round the loop) we have an
3593 expired host that hasn't been tried since the message arrived. Have a go
3594 at delivering the message to it. First prepare the addresses by flushing
3595 out the result of previous attempts, and finding the first address that
3596 is still to be delivered. */
3597
3598 first_addr = prepare_addresses(addrlist, host);
3599
3600 DEBUG(D_transport) debug_printf("delivering %s to %s [%s] (%s%s)\n",
3601 message_id, host->name, host->address, addrlist->address,
3602 (addrlist->next == NULL)? "" : ", ...");
3603
3604 set_process_info("delivering %s to %s [%s] (%s%s)",
3605 message_id, host->name, host->address, addrlist->address,
3606 (addrlist->next == NULL)? "" : ", ...");
3607
3608 /* This is not for real; don't do the delivery. If there are
3609 any remaining hosts, list them. */
3610
3611 if (dont_deliver)
3612 {
3613 host_item *host2;
3614 set_errno_nohost(addrlist, 0, NULL, OK, FALSE);
3615 for (addr = addrlist; addr != NULL; addr = addr->next)
3616 {
3617 addr->host_used = host;
3618 addr->special_action = '*';
3619 addr->message = US"delivery bypassed by -N option";
3620 }
3621 DEBUG(D_transport)
3622 {
3623 debug_printf("*** delivery by %s transport bypassed by -N option\n"
3624 "*** host and remaining hosts:\n", tblock->name);
3625 for (host2 = host; host2 != NULL; host2 = host2->next)
3626 debug_printf(" %s [%s]\n", host2->name,
3627 (host2->address == NULL)? US"unset" : host2->address);
3628 }
3629 rc = OK;
3630 }
3631
3632 /* This is for real. If the host is expired, we don't count it for
3633 hosts_max_retry. This ensures that all hosts must expire before an address
3634 is timed out, unless hosts_max_try_hardlimit (which protects against
3635 lunatic DNS configurations) is reached.
3636
3637 If the host is not expired and we are about to hit the hosts_max_retry
3638 limit, check to see if there is a subsequent hosts with a different MX
3639 value. If so, make that the next host, and don't count this one. This is a
3640 heuristic to make sure that different MXs do get tried. With a normal kind
3641 of retry rule, they would get tried anyway when the earlier hosts were
3642 delayed, but if the domain has a "retry every time" type of rule - as is
3643 often used for the the very large ISPs, that won't happen. */
3644
3645 else
3646 {
3647 host_item * thost;
3648 /* Make a copy of the host if it is local to this invocation
3649 of the transport. */
3650
3651 if (expanded_hosts)
3652 {
3653 thost = store_get(sizeof(host_item));
3654 *thost = *host;
3655 thost->name = string_copy(host->name);
3656 thost->address = string_copy(host->address);
3657 }
3658 else
3659 thost = host;
3660
3661 if (!host_is_expired && ++unexpired_hosts_tried >= ob->hosts_max_try)
3662 {
3663 host_item *h;
3664 DEBUG(D_transport)
3665 debug_printf("hosts_max_try limit reached with this host\n");
3666 for (h = host; h; h = h->next) if (h->mx != host->mx)
3667 {
3668 nexthost = h;
3669 unexpired_hosts_tried--;
3670 DEBUG(D_transport) debug_printf("however, a higher MX host exists "
3671 "and will be tried\n");
3672 break;
3673 }
3674 }
3675
3676 /* Attempt the delivery. */
3677
3678 total_hosts_tried++;
3679 rc = smtp_deliver(addrlist, thost, host_af, port, interface, tblock,
3680 &message_defer, FALSE);
3681
3682 /* Yield is one of:
3683 OK => connection made, each address contains its result;
3684 message_defer is set for message-specific defers (when all
3685 recipients are marked defer)
3686 DEFER => there was a non-message-specific delivery problem;
3687 ERROR => there was a problem setting up the arguments for a filter,
3688 or there was a problem with expanding added headers
3689 */
3690
3691 /* If the result is not OK, there was a non-message-specific problem.
3692 If the result is DEFER, we need to write to the logs saying what happened
3693 for this particular host, except in the case of authentication and TLS
3694 failures, where the log has already been written. If all hosts defer a
3695 general message is written at the end. */
3696
3697 if (rc == DEFER && first_addr->basic_errno != ERRNO_AUTHFAIL &&
3698 first_addr->basic_errno != ERRNO_TLSFAILURE)
3699 write_logs(first_addr, host);
3700
3701 #ifndef DISABLE_EVENT
3702 if (rc == DEFER)
3703 deferred_event_raise(first_addr, host);
3704 #endif
3705
3706 /* If STARTTLS was accepted, but there was a failure in setting up the
3707 TLS session (usually a certificate screwup), and the host is not in
3708 hosts_require_tls, and tls_tempfail_tryclear is true, try again, with
3709 TLS forcibly turned off. We have to start from scratch with a new SMTP
3710 connection. That's why the retry is done from here, not from within
3711 smtp_deliver(). [Rejections of STARTTLS itself don't screw up the
3712 session, so the in-clear transmission after those errors, if permitted,
3713 happens inside smtp_deliver().] */
3714
3715 #ifdef SUPPORT_TLS
3716 if ( rc == DEFER
3717 && first_addr->basic_errno == ERRNO_TLSFAILURE
3718 && ob->tls_tempfail_tryclear
3719 && verify_check_given_host(&ob->hosts_require_tls, host) != OK
3720 )
3721 {
3722 log_write(0, LOG_MAIN, "TLS session failure: delivering unencrypted "
3723 "to %s [%s] (not in hosts_require_tls)", host->name, host->address);
3724 first_addr = prepare_addresses(addrlist, host);
3725 rc = smtp_deliver(addrlist, thost, host_af, port, interface, tblock,
3726 &message_defer, TRUE);
3727 if (rc == DEFER && first_addr->basic_errno != ERRNO_AUTHFAIL)
3728 write_logs(first_addr, host);
3729 # ifndef DISABLE_EVENT
3730 if (rc == DEFER)
3731 deferred_event_raise(first_addr, host);
3732 # endif
3733 }
3734 #endif /*SUPPORT_TLS*/
3735 }
3736
3737 /* Delivery attempt finished */
3738
3739 rs = (rc == OK)? US"OK" : (rc == DEFER)? US"DEFER" : (rc == ERROR)?
3740 US"ERROR" : US"?";
3741
3742 set_process_info("delivering %s: just tried %s [%s] for %s%s: result %s",
3743 message_id, host->name, host->address, addrlist->address,
3744 (addrlist->next == NULL)? "" : " (& others)", rs);
3745
3746 /* Release serialization if set up */
3747
3748 if (serialized) enq_end(serialize_key);
3749
3750 /* If the result is DEFER, or if a host retry record is known to exist, we
3751 need to add an item to the retry chain for updating the retry database
3752 at the end of delivery. We only need to add the item to the top address,
3753 of course. Also, if DEFER, we mark the IP address unusable so as to skip it
3754 for any other delivery attempts using the same address. (It is copied into
3755 the unusable tree at the outer level, so even if different address blocks
3756 contain the same address, it still won't get tried again.) */
3757
3758 if (rc == DEFER || retry_host_key != NULL)
3759 {
3760 int delete_flag = (rc != DEFER)? rf_delete : 0;
3761 if (retry_host_key == NULL)
3762 {
3763 BOOL incl_ip;
3764 if (exp_bool(addrlist, US"transport", tblock->name, D_transport,
3765 US"retry_include_ip_address", ob->retry_include_ip_address,
3766 ob->expand_retry_include_ip_address, &incl_ip) != OK)
3767 incl_ip = TRUE; /* error; use most-specific retry record */
3768
3769 retry_host_key = incl_ip ?
3770 string_sprintf("T:%S:%s%s", host->name, host->address, pistring) :
3771 string_sprintf("T:%S%s", host->name, pistring);
3772 }
3773
3774 /* If a delivery of another message over an existing SMTP connection
3775 yields DEFER, we do NOT set up retry data for the host. This covers the
3776 case when there are delays in routing the addresses in the second message
3777 that are so long that the server times out. This is alleviated by not
3778 routing addresses that previously had routing defers when handling an
3779 existing connection, but even so, this case may occur (e.g. if a
3780 previously happily routed address starts giving routing defers). If the
3781 host is genuinely down, another non-continued message delivery will
3782 notice it soon enough. */
3783
3784 if (delete_flag != 0 || !continuing)
3785 retry_add_item(first_addr, retry_host_key, rf_host | delete_flag);
3786
3787 /* We may have tried an expired host, if its retry time has come; ensure
3788 the status reflects the expiry for the benefit of any other addresses. */
3789
3790 if (rc == DEFER)
3791 {
3792 host->status = (host_is_expired)?
3793 hstatus_unusable_expired : hstatus_unusable;
3794 host->why = hwhy_deferred;
3795 }
3796 }
3797
3798 /* If message_defer is set (host was OK, but every recipient got deferred
3799 because of some message-specific problem), or if that had happened
3800 previously so that a message retry key exists, add an appropriate item
3801 to the retry chain. Note that if there was a message defer but now there is
3802 a host defer, the message defer record gets deleted. That seems perfectly
3803 reasonable. Also, stop the message from being remembered as waiting
3804 for specific hosts. */
3805
3806 if (message_defer || retry_message_key != NULL)
3807 {
3808 int delete_flag = message_defer? 0 : rf_delete;
3809 if (retry_message_key == NULL)
3810 {
3811 BOOL incl_ip;
3812 if (exp_bool(addrlist, US"transport", tblock->name, D_transport,
3813 US"retry_include_ip_address", ob->retry_include_ip_address,
3814 ob->expand_retry_include_ip_address, &incl_ip) != OK)
3815 incl_ip = TRUE; /* error; use most-specific retry record */
3816
3817 retry_message_key = incl_ip ?
3818 string_sprintf("T:%S:%s%s:%s", host->name, host->address, pistring,
3819 message_id) :
3820 string_sprintf("T:%S%s:%s", host->name, pistring, message_id);
3821 }
3822 retry_add_item(addrlist, retry_message_key,
3823 rf_message | rf_host | delete_flag);
3824 update_waiting = FALSE;
3825 }
3826
3827 /* Any return other than DEFER (that is, OK or ERROR) means that the
3828 addresses have got their final statuses filled in for this host. In the OK
3829 case, see if any of them are deferred. */
3830
3831 if (rc == OK)
3832 for (addr = addrlist; addr; addr = addr->next)
3833 if (addr->transport_return == DEFER)
3834 {
3835 some_deferred = TRUE;
3836 break;
3837 }
3838
3839 /* If no addresses deferred or the result was ERROR, return. We do this for
3840 ERROR because a failing filter set-up or add_headers expansion is likely to
3841 fail for any host we try. */
3842
3843 if (rc == ERROR || (rc == OK && !some_deferred))
3844 {
3845 DEBUG(D_transport) debug_printf("Leaving %s transport\n", tblock->name);
3846 return TRUE; /* Each address has its status */
3847 }
3848
3849 /* If the result was DEFER or some individual addresses deferred, let
3850 the loop run to try other hosts with the deferred addresses, except for the
3851 case when we were trying to deliver down an existing channel and failed.
3852 Don't try any other hosts in this case. */
3853
3854 if (continuing) break;
3855
3856 /* If the whole delivery, or some individual addresses, were deferred and
3857 there are more hosts that could be tried, do not count this host towards
3858 the hosts_max_try limit if the age of the message is greater than the
3859 maximum retry time for this host. This means we may try try all hosts,
3860 ignoring the limit, when messages have been around for some time. This is
3861 important because if we don't try all hosts, the address will never time
3862 out. NOTE: this does not apply to hosts_max_try_hardlimit. */
3863
3864 if ((rc == DEFER || some_deferred) && nexthost != NULL)
3865 {
3866 BOOL timedout;
3867 retry_config *retry = retry_find_config(host->name, NULL, 0, 0);
3868
3869 if (retry != NULL && retry->rules != NULL)
3870 {
3871 retry_rule *last_rule;
3872 for (last_rule = retry->rules;
3873 last_rule->next != NULL;
3874 last_rule = last_rule->next);
3875 timedout = time(NULL) - received_time > last_rule->timeout;
3876 }
3877 else timedout = TRUE; /* No rule => timed out */
3878
3879 if (timedout)
3880 {
3881 unexpired_hosts_tried--;
3882 DEBUG(D_transport) debug_printf("temporary delivery error(s) override "
3883 "hosts_max_try (message older than host's retry time)\n");
3884 }
3885 }
3886 } /* End of loop for trying multiple hosts. */
3887
3888 /* This is the end of the loop that repeats iff expired is TRUE and
3889 ob->delay_after_cutoff is FALSE. The second time round we will
3890 try those hosts that haven't been tried since the message arrived. */
3891
3892 DEBUG(D_transport)
3893 {
3894 debug_printf("all IP addresses skipped or deferred at least one address\n");
3895 if (expired && !ob->delay_after_cutoff && cutoff_retry == 0)
3896 debug_printf("retrying IP addresses not tried since message arrived\n");
3897 }
3898 }
3899
3900
3901 /* Get here if all IP addresses are skipped or defer at least one address. In
3902 MUA wrapper mode, this will happen only for connection or other non-message-
3903 specific failures. Force the delivery status for all addresses to FAIL. */
3904
3905 if (mua_wrapper)
3906 {
3907 for (addr = addrlist; addr != NULL; addr = addr->next)
3908 addr->transport_return = FAIL;
3909 goto END_TRANSPORT;
3910 }
3911
3912 /* In the normal, non-wrapper case, add a standard message to each deferred
3913 address if there hasn't been an error, that is, if it hasn't actually been
3914 tried this time. The variable "expired" will be FALSE if any deliveries were
3915 actually tried, or if there was at least one host that was not expired. That
3916 is, it is TRUE only if no deliveries were tried and all hosts were expired. If
3917 a delivery has been tried, an error code will be set, and the failing of the
3918 message is handled by the retry code later.
3919
3920 If queue_smtp is set, or this transport was called to send a subsequent message
3921 down an existing TCP/IP connection, and something caused the host not to be
3922 found, we end up here, but can detect these cases and handle them specially. */
3923
3924 for (addr = addrlist; addr; addr = addr->next)
3925 {
3926 /* If host is not NULL, it means that we stopped processing the host list
3927 because of hosts_max_try or hosts_max_try_hardlimit. In the former case, this
3928 means we need to behave as if some hosts were skipped because their retry
3929 time had not come. Specifically, this prevents the address from timing out.
3930 However, if we have hit hosts_max_try_hardlimit, we want to behave as if all
3931 hosts were tried. */
3932
3933 if (host)
3934 if (total_hosts_tried >= ob->hosts_max_try_hardlimit)
3935 {
3936 DEBUG(D_transport)
3937 debug_printf("hosts_max_try_hardlimit reached: behave as if all "
3938 "hosts were tried\n");
3939 }
3940 else
3941 {
3942 DEBUG(D_transport)
3943 debug_printf("hosts_max_try limit caused some hosts to be skipped\n");
3944 setflag(addr, af_retry_skipped);
3945 }
3946
3947 if (queue_smtp) /* no deliveries attempted */
3948 {
3949 addr->transport_return = DEFER;
3950 addr->basic_errno = 0;
3951 addr->message = US"SMTP delivery explicitly queued";
3952 }
3953
3954 else if ( addr->transport_return == DEFER
3955 && (addr->basic_errno == ERRNO_UNKNOWNERROR || addr->basic_errno == 0)
3956 && !addr->message
3957 )
3958 {
3959 addr->basic_errno = ERRNO_HRETRY;
3960 if (continue_hostname)
3961 addr->message = US"no host found for existing SMTP connection";
3962 else if (expired)
3963 {
3964 setflag(addr, af_pass_message); /* This is not a security risk */
3965 addr->message = string_sprintf(
3966 "all hosts%s have been failing for a long time %s",
3967 addr->domain ? string_sprintf(" for '%s'", addr->domain) : US"",
3968 ob->delay_after_cutoff
3969 ? US"(and retry time not reached)"
3970 : US"and were last tried after this message arrived");
3971
3972 /* If we are already using fallback hosts, or there are no fallback hosts
3973 defined, convert the result to FAIL to cause a bounce. */
3974
3975 if (addr->host_list == addr->fallback_hosts || !addr->fallback_hosts)
3976 addr->transport_return = FAIL;
3977 }
3978 else
3979 {
3980 const char * s;
3981 if (hosts_retry == hosts_total)
3982 s = "retry time not reached for any host%s";
3983 else if (hosts_fail == hosts_total)
3984 s = "all host address lookups%s failed permanently";
3985 else if (hosts_defer == hosts_total)
3986 s = "all host address lookups%s failed temporarily";
3987 else if (hosts_serial == hosts_total)
3988 s = "connection limit reached for all hosts%s";
3989 else if (hosts_fail+hosts_defer == hosts_total)
3990 s = "all host address lookups%s failed";
3991 else
3992 s = "some host address lookups failed and retry time "
3993 "not reached for other hosts or connection limit reached%s";
3994
3995 addr->message = string_sprintf(s,
3996 addr->domain ? string_sprintf(" for '%s'", addr->domain) : US"");
3997 }
3998 }
3999 }
4000
4001 /* Update the database which keeps information about which messages are waiting
4002 for which hosts to become available. For some message-specific errors, the
4003 update_waiting flag is turned off because we don't want follow-on deliveries in
4004 those cases. If this transport instance is explicitly limited to one message
4005 per connection then follow-on deliveries are not possible and there's no need
4006 to create/update the per-transport wait-<transport_name> database. */
4007
4008 if (update_waiting && tblock->connection_max_messages != 1)
4009 transport_update_waiting(hostlist, tblock->name);
4010
4011 END_TRANSPORT:
4012
4013 DEBUG(D_transport) debug_printf("Leaving %s transport\n", tblock->name);
4014
4015 return TRUE; /* Each address has its status */
4016 }
4017
4018 /* vi: aw ai sw=2
4019 */
4020 /* End of transport/smtp.c */
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