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[exim.git] / src / src / transports / smtp.c
1 /*************************************************
2 * Exim - an Internet mail transport agent *
3 *************************************************/
4
5 /* Copyright (c) University of Cambridge 1995 - 2014 */
6 /* See the file NOTICE for conditions of use and distribution. */
7
8 #include "../exim.h"
9 #include "smtp.h"
10
11 #define PENDING 256
12 #define PENDING_DEFER (PENDING + DEFER)
13 #define PENDING_OK (PENDING + OK)
14
15
16 /* Options specific to the smtp transport. This transport also supports LMTP
17 over TCP/IP. The options must be in alphabetic order (note that "_" comes
18 before the lower case letters). Some live in the transport_instance block so as
19 to be publicly visible; these are flagged with opt_public. */
20
21 optionlist smtp_transport_options[] = {
22 { "*expand_multi_domain", opt_stringptr | opt_hidden | opt_public,
23 (void *)offsetof(transport_instance, expand_multi_domain) },
24 { "*expand_retry_include_ip_address", opt_stringptr | opt_hidden,
25 (void *)(offsetof(smtp_transport_options_block, expand_retry_include_ip_address)) },
26
27 { "address_retry_include_sender", opt_bool,
28 (void *)offsetof(smtp_transport_options_block, address_retry_include_sender) },
29 { "allow_localhost", opt_bool,
30 (void *)offsetof(smtp_transport_options_block, allow_localhost) },
31 { "authenticated_sender", opt_stringptr,
32 (void *)offsetof(smtp_transport_options_block, authenticated_sender) },
33 { "authenticated_sender_force", opt_bool,
34 (void *)offsetof(smtp_transport_options_block, authenticated_sender_force) },
35 { "command_timeout", opt_time,
36 (void *)offsetof(smtp_transport_options_block, command_timeout) },
37 { "connect_timeout", opt_time,
38 (void *)offsetof(smtp_transport_options_block, connect_timeout) },
39 { "connection_max_messages", opt_int | opt_public,
40 (void *)offsetof(transport_instance, connection_max_messages) },
41 { "data_timeout", opt_time,
42 (void *)offsetof(smtp_transport_options_block, data_timeout) },
43 { "delay_after_cutoff", opt_bool,
44 (void *)offsetof(smtp_transport_options_block, delay_after_cutoff) },
45 #ifndef DISABLE_DKIM
46 { "dkim_canon", opt_stringptr,
47 (void *)offsetof(smtp_transport_options_block, dkim_canon) },
48 { "dkim_domain", opt_stringptr,
49 (void *)offsetof(smtp_transport_options_block, dkim_domain) },
50 { "dkim_private_key", opt_stringptr,
51 (void *)offsetof(smtp_transport_options_block, dkim_private_key) },
52 { "dkim_selector", opt_stringptr,
53 (void *)offsetof(smtp_transport_options_block, dkim_selector) },
54 { "dkim_sign_headers", opt_stringptr,
55 (void *)offsetof(smtp_transport_options_block, dkim_sign_headers) },
56 { "dkim_strict", opt_stringptr,
57 (void *)offsetof(smtp_transport_options_block, dkim_strict) },
58 #endif
59 { "dns_qualify_single", opt_bool,
60 (void *)offsetof(smtp_transport_options_block, dns_qualify_single) },
61 { "dns_search_parents", opt_bool,
62 (void *)offsetof(smtp_transport_options_block, dns_search_parents) },
63 { "dnssec_request_domains", opt_stringptr,
64 (void *)offsetof(smtp_transport_options_block, dnssec_request_domains) },
65 { "dnssec_require_domains", opt_stringptr,
66 (void *)offsetof(smtp_transport_options_block, dnssec_require_domains) },
67 { "dscp", opt_stringptr,
68 (void *)offsetof(smtp_transport_options_block, dscp) },
69 { "fallback_hosts", opt_stringptr,
70 (void *)offsetof(smtp_transport_options_block, fallback_hosts) },
71 { "final_timeout", opt_time,
72 (void *)offsetof(smtp_transport_options_block, final_timeout) },
73 { "gethostbyname", opt_bool,
74 (void *)offsetof(smtp_transport_options_block, gethostbyname) },
75 #ifdef SUPPORT_TLS
76 /* These are no longer honoured, as of Exim 4.80; for now, we silently
77 ignore; 4.83 will warn, and a later-still release will remove
78 these options, so that using them becomes an error. */
79 { "gnutls_require_kx", opt_stringptr,
80 (void *)offsetof(smtp_transport_options_block, gnutls_require_kx) },
81 { "gnutls_require_mac", opt_stringptr,
82 (void *)offsetof(smtp_transport_options_block, gnutls_require_mac) },
83 { "gnutls_require_protocols", opt_stringptr,
84 (void *)offsetof(smtp_transport_options_block, gnutls_require_proto) },
85 #endif
86 { "helo_data", opt_stringptr,
87 (void *)offsetof(smtp_transport_options_block, helo_data) },
88 { "hosts", opt_stringptr,
89 (void *)offsetof(smtp_transport_options_block, hosts) },
90 { "hosts_avoid_esmtp", opt_stringptr,
91 (void *)offsetof(smtp_transport_options_block, hosts_avoid_esmtp) },
92 { "hosts_avoid_pipelining", opt_stringptr,
93 (void *)offsetof(smtp_transport_options_block, hosts_avoid_pipelining) },
94 #ifdef SUPPORT_TLS
95 { "hosts_avoid_tls", opt_stringptr,
96 (void *)offsetof(smtp_transport_options_block, hosts_avoid_tls) },
97 #endif
98 { "hosts_max_try", opt_int,
99 (void *)offsetof(smtp_transport_options_block, hosts_max_try) },
100 { "hosts_max_try_hardlimit", opt_int,
101 (void *)offsetof(smtp_transport_options_block, hosts_max_try_hardlimit) },
102 #ifdef SUPPORT_TLS
103 { "hosts_nopass_tls", opt_stringptr,
104 (void *)offsetof(smtp_transport_options_block, hosts_nopass_tls) },
105 #endif
106 { "hosts_override", opt_bool,
107 (void *)offsetof(smtp_transport_options_block, hosts_override) },
108 { "hosts_randomize", opt_bool,
109 (void *)offsetof(smtp_transport_options_block, hosts_randomize) },
110 #if defined(SUPPORT_TLS) && !defined(DISABLE_OCSP)
111 { "hosts_request_ocsp", opt_stringptr,
112 (void *)offsetof(smtp_transport_options_block, hosts_request_ocsp) },
113 #endif
114 { "hosts_require_auth", opt_stringptr,
115 (void *)offsetof(smtp_transport_options_block, hosts_require_auth) },
116 #ifdef SUPPORT_TLS
117 # ifdef EXPERIMENTAL_DANE
118 { "hosts_require_dane", opt_stringptr,
119 (void *)offsetof(smtp_transport_options_block, hosts_require_dane) },
120 # endif
121 # ifndef DISABLE_OCSP
122 { "hosts_require_ocsp", opt_stringptr,
123 (void *)offsetof(smtp_transport_options_block, hosts_require_ocsp) },
124 # endif
125 { "hosts_require_tls", opt_stringptr,
126 (void *)offsetof(smtp_transport_options_block, hosts_require_tls) },
127 #endif
128 { "hosts_try_auth", opt_stringptr,
129 (void *)offsetof(smtp_transport_options_block, hosts_try_auth) },
130 #if defined(SUPPORT_TLS) && defined(EXPERIMENTAL_DANE)
131 { "hosts_try_dane", opt_stringptr,
132 (void *)offsetof(smtp_transport_options_block, hosts_try_dane) },
133 #endif
134 #ifndef DISABLE_PRDR
135 { "hosts_try_prdr", opt_stringptr,
136 (void *)offsetof(smtp_transport_options_block, hosts_try_prdr) },
137 #endif
138 #ifdef SUPPORT_TLS
139 { "hosts_verify_avoid_tls", opt_stringptr,
140 (void *)offsetof(smtp_transport_options_block, hosts_verify_avoid_tls) },
141 #endif
142 { "interface", opt_stringptr,
143 (void *)offsetof(smtp_transport_options_block, interface) },
144 { "keepalive", opt_bool,
145 (void *)offsetof(smtp_transport_options_block, keepalive) },
146 { "lmtp_ignore_quota", opt_bool,
147 (void *)offsetof(smtp_transport_options_block, lmtp_ignore_quota) },
148 { "max_rcpt", opt_int | opt_public,
149 (void *)offsetof(transport_instance, max_addresses) },
150 { "multi_domain", opt_expand_bool | opt_public,
151 (void *)offsetof(transport_instance, multi_domain) },
152 { "port", opt_stringptr,
153 (void *)offsetof(smtp_transport_options_block, port) },
154 { "protocol", opt_stringptr,
155 (void *)offsetof(smtp_transport_options_block, protocol) },
156 { "retry_include_ip_address", opt_expand_bool,
157 (void *)offsetof(smtp_transport_options_block, retry_include_ip_address) },
158 { "serialize_hosts", opt_stringptr,
159 (void *)offsetof(smtp_transport_options_block, serialize_hosts) },
160 { "size_addition", opt_int,
161 (void *)offsetof(smtp_transport_options_block, size_addition) }
162 #ifdef EXPERIMENTAL_SOCKS
163 ,{ "socks_proxy", opt_stringptr,
164 (void *)offsetof(smtp_transport_options_block, socks_proxy) }
165 #endif
166 #ifdef SUPPORT_TLS
167 ,{ "tls_certificate", opt_stringptr,
168 (void *)offsetof(smtp_transport_options_block, tls_certificate) },
169 { "tls_crl", opt_stringptr,
170 (void *)offsetof(smtp_transport_options_block, tls_crl) },
171 { "tls_dh_min_bits", opt_int,
172 (void *)offsetof(smtp_transport_options_block, tls_dh_min_bits) },
173 { "tls_privatekey", opt_stringptr,
174 (void *)offsetof(smtp_transport_options_block, tls_privatekey) },
175 { "tls_require_ciphers", opt_stringptr,
176 (void *)offsetof(smtp_transport_options_block, tls_require_ciphers) },
177 { "tls_sni", opt_stringptr,
178 (void *)offsetof(smtp_transport_options_block, tls_sni) },
179 { "tls_tempfail_tryclear", opt_bool,
180 (void *)offsetof(smtp_transport_options_block, tls_tempfail_tryclear) },
181 { "tls_try_verify_hosts", opt_stringptr,
182 (void *)offsetof(smtp_transport_options_block, tls_try_verify_hosts) },
183 { "tls_verify_cert_hostnames", opt_stringptr,
184 (void *)offsetof(smtp_transport_options_block,tls_verify_cert_hostnames)},
185 { "tls_verify_certificates", opt_stringptr,
186 (void *)offsetof(smtp_transport_options_block, tls_verify_certificates) },
187 { "tls_verify_hosts", opt_stringptr,
188 (void *)offsetof(smtp_transport_options_block, tls_verify_hosts) }
189 #endif
190 };
191
192 /* Size of the options list. An extern variable has to be used so that its
193 address can appear in the tables drtables.c. */
194
195 int smtp_transport_options_count =
196 sizeof(smtp_transport_options)/sizeof(optionlist);
197
198 /* Default private options block for the smtp transport. */
199
200 smtp_transport_options_block smtp_transport_option_defaults = {
201 NULL, /* hosts */
202 NULL, /* fallback_hosts */
203 NULL, /* hostlist */
204 NULL, /* fallback_hostlist */
205 NULL, /* authenticated_sender */
206 US"$primary_hostname", /* helo_data */
207 NULL, /* interface */
208 NULL, /* port */
209 US"smtp", /* protocol */
210 NULL, /* DSCP */
211 NULL, /* serialize_hosts */
212 NULL, /* hosts_try_auth */
213 NULL, /* hosts_require_auth */
214 #ifdef EXPERIMENTAL_DANE
215 NULL, /* hosts_try_dane */
216 NULL, /* hosts_require_dane */
217 #endif
218 #ifndef DISABLE_PRDR
219 US"*", /* hosts_try_prdr */
220 #endif
221 #ifndef DISABLE_OCSP
222 US"*", /* hosts_request_ocsp (except under DANE; tls_client_start()) */
223 NULL, /* hosts_require_ocsp */
224 #endif
225 NULL, /* hosts_require_tls */
226 NULL, /* hosts_avoid_tls */
227 NULL, /* hosts_verify_avoid_tls */
228 NULL, /* hosts_avoid_pipelining */
229 NULL, /* hosts_avoid_esmtp */
230 NULL, /* hosts_nopass_tls */
231 5*60, /* command_timeout */
232 5*60, /* connect_timeout; shorter system default overrides */
233 5*60, /* data timeout */
234 10*60, /* final timeout */
235 1024, /* size_addition */
236 5, /* hosts_max_try */
237 50, /* hosts_max_try_hardlimit */
238 TRUE, /* address_retry_include_sender */
239 FALSE, /* allow_localhost */
240 FALSE, /* authenticated_sender_force */
241 FALSE, /* gethostbyname */
242 TRUE, /* dns_qualify_single */
243 FALSE, /* dns_search_parents */
244 NULL, /* dnssec_request_domains */
245 NULL, /* dnssec_require_domains */
246 TRUE, /* delay_after_cutoff */
247 FALSE, /* hosts_override */
248 FALSE, /* hosts_randomize */
249 TRUE, /* keepalive */
250 FALSE, /* lmtp_ignore_quota */
251 NULL, /* expand_retry_include_ip_address */
252 TRUE /* retry_include_ip_address */
253 #ifdef EXPERIMENTAL_SOCKS
254 ,NULL /* socks_proxy */
255 #endif
256 #ifdef SUPPORT_TLS
257 ,NULL, /* tls_certificate */
258 NULL, /* tls_crl */
259 NULL, /* tls_privatekey */
260 NULL, /* tls_require_ciphers */
261 NULL, /* gnutls_require_kx */
262 NULL, /* gnutls_require_mac */
263 NULL, /* gnutls_require_proto */
264 NULL, /* tls_sni */
265 US"system", /* tls_verify_certificates */
266 EXIM_CLIENT_DH_DEFAULT_MIN_BITS,
267 /* tls_dh_min_bits */
268 TRUE, /* tls_tempfail_tryclear */
269 NULL, /* tls_verify_hosts */
270 US"*", /* tls_try_verify_hosts */
271 US"*" /* tls_verify_cert_hostnames */
272 #endif
273 #ifndef DISABLE_DKIM
274 ,NULL, /* dkim_canon */
275 NULL, /* dkim_domain */
276 NULL, /* dkim_private_key */
277 NULL, /* dkim_selector */
278 NULL, /* dkim_sign_headers */
279 NULL /* dkim_strict */
280 #endif
281 };
282
283 /* some DSN flags for use later */
284
285 static int rf_list[] = {rf_notify_never, rf_notify_success,
286 rf_notify_failure, rf_notify_delay };
287
288 static uschar *rf_names[] = { US"NEVER", US"SUCCESS", US"FAILURE", US"DELAY" };
289
290
291
292 /* Local statics */
293
294 static uschar *smtp_command; /* Points to last cmd for error messages */
295 static uschar *mail_command; /* Points to MAIL cmd for error messages */
296 static BOOL update_waiting; /* TRUE to update the "wait" database */
297
298
299 /*************************************************
300 * Setup entry point *
301 *************************************************/
302
303 /* This function is called when the transport is about to be used,
304 but before running it in a sub-process. It is used for two things:
305
306 (1) To set the fallback host list in addresses, when delivering.
307 (2) To pass back the interface, port, protocol, and other options, for use
308 during callout verification.
309
310 Arguments:
311 tblock pointer to the transport instance block
312 addrlist list of addresses about to be transported
313 tf if not NULL, pointer to block in which to return options
314 uid the uid that will be set (not used)
315 gid the gid that will be set (not used)
316 errmsg place for error message (not used)
317
318 Returns: OK always (FAIL, DEFER not used)
319 */
320
321 static int
322 smtp_transport_setup(transport_instance *tblock, address_item *addrlist,
323 transport_feedback *tf, uid_t uid, gid_t gid, uschar **errmsg)
324 {
325 smtp_transport_options_block *ob =
326 (smtp_transport_options_block *)(tblock->options_block);
327
328 errmsg = errmsg; /* Keep picky compilers happy */
329 uid = uid;
330 gid = gid;
331
332 /* Pass back options if required. This interface is getting very messy. */
333
334 if (tf != NULL)
335 {
336 tf->interface = ob->interface;
337 tf->port = ob->port;
338 tf->protocol = ob->protocol;
339 tf->hosts = ob->hosts;
340 tf->hosts_override = ob->hosts_override;
341 tf->hosts_randomize = ob->hosts_randomize;
342 tf->gethostbyname = ob->gethostbyname;
343 tf->qualify_single = ob->dns_qualify_single;
344 tf->search_parents = ob->dns_search_parents;
345 tf->helo_data = ob->helo_data;
346 }
347
348 /* Set the fallback host list for all the addresses that don't have fallback
349 host lists, provided that the local host wasn't present in the original host
350 list. */
351
352 if (!testflag(addrlist, af_local_host_removed))
353 {
354 for (; addrlist != NULL; addrlist = addrlist->next)
355 if (addrlist->fallback_hosts == NULL)
356 addrlist->fallback_hosts = ob->fallback_hostlist;
357 }
358
359 return OK;
360 }
361
362
363
364 /*************************************************
365 * Initialization entry point *
366 *************************************************/
367
368 /* Called for each instance, after its options have been read, to
369 enable consistency checks to be done, or anything else that needs
370 to be set up.
371
372 Argument: pointer to the transport instance block
373 Returns: nothing
374 */
375
376 void
377 smtp_transport_init(transport_instance *tblock)
378 {
379 smtp_transport_options_block *ob =
380 (smtp_transport_options_block *)(tblock->options_block);
381
382 /* Retry_use_local_part defaults FALSE if unset */
383
384 if (tblock->retry_use_local_part == TRUE_UNSET)
385 tblock->retry_use_local_part = FALSE;
386
387 /* Set the default port according to the protocol */
388
389 if (ob->port == NULL)
390 ob->port = (strcmpic(ob->protocol, US"lmtp") == 0)? US"lmtp" :
391 (strcmpic(ob->protocol, US"smtps") == 0)? US"smtps" : US"smtp";
392
393 /* Set up the setup entry point, to be called before subprocesses for this
394 transport. */
395
396 tblock->setup = smtp_transport_setup;
397
398 /* Complain if any of the timeouts are zero. */
399
400 if (ob->command_timeout <= 0 || ob->data_timeout <= 0 ||
401 ob->final_timeout <= 0)
402 log_write(0, LOG_PANIC_DIE|LOG_CONFIG,
403 "command, data, or final timeout value is zero for %s transport",
404 tblock->name);
405
406 /* If hosts_override is set and there are local hosts, set the global
407 flag that stops verify from showing router hosts. */
408
409 if (ob->hosts_override && ob->hosts != NULL) tblock->overrides_hosts = TRUE;
410
411 /* If there are any fallback hosts listed, build a chain of host items
412 for them, but do not do any lookups at this time. */
413
414 host_build_hostlist(&(ob->fallback_hostlist), ob->fallback_hosts, FALSE);
415
416 #ifdef SUPPORT_TLS
417 if ( ob->gnutls_require_kx
418 || ob->gnutls_require_mac
419 || ob->gnutls_require_proto)
420 log_write(0, LOG_MAIN, "WARNING: smtp transport options"
421 " gnutls_require_kx, gnutls_require_mac and gnutls_require_protocols"
422 " are obsolete\n");
423 #endif
424 }
425
426
427
428
429
430 /*************************************************
431 * Set delivery info into all active addresses *
432 *************************************************/
433
434 /* Only addresses whose status is >= PENDING are relevant. A lesser
435 status means that an address is not currently being processed.
436
437 Arguments:
438 addrlist points to a chain of addresses
439 errno_value to put in each address's errno field
440 msg to put in each address's message field
441 rc to put in each address's transport_return field
442 pass_message if TRUE, set the "pass message" flag in the address
443 host if set, mark addrs as having used this host
444
445 If errno_value has the special value ERRNO_CONNECTTIMEOUT, ETIMEDOUT is put in
446 the errno field, and RTEF_CTOUT is ORed into the more_errno field, to indicate
447 this particular type of timeout.
448
449 Returns: nothing
450 */
451
452 static void
453 set_errno(address_item *addrlist, int errno_value, uschar *msg, int rc,
454 BOOL pass_message, host_item * host)
455 {
456 address_item *addr;
457 int orvalue = 0;
458 if (errno_value == ERRNO_CONNECTTIMEOUT)
459 {
460 errno_value = ETIMEDOUT;
461 orvalue = RTEF_CTOUT;
462 }
463 for (addr = addrlist; addr != NULL; addr = addr->next)
464 if (addr->transport_return >= PENDING)
465 {
466 addr->basic_errno = errno_value;
467 addr->more_errno |= orvalue;
468 if (msg != NULL)
469 {
470 addr->message = msg;
471 if (pass_message) setflag(addr, af_pass_message);
472 }
473 addr->transport_return = rc;
474 if (host)
475 addr->host_used = host;
476 }
477 }
478
479
480
481 /*************************************************
482 * Check an SMTP response *
483 *************************************************/
484
485 /* This function is given an errno code and the SMTP response buffer
486 to analyse, together with the host identification for generating messages. It
487 sets an appropriate message and puts the first digit of the response code into
488 the yield variable. If no response was actually read, a suitable digit is
489 chosen.
490
491 Arguments:
492 host the current host, to get its name for messages
493 errno_value pointer to the errno value
494 more_errno from the top address for use with ERRNO_FILTER_FAIL
495 buffer the SMTP response buffer
496 yield where to put a one-digit SMTP response code
497 message where to put an errror message
498 pass_message set TRUE if message is an SMTP response
499
500 Returns: TRUE if an SMTP "QUIT" command should be sent, else FALSE
501 */
502
503 static BOOL
504 check_response(host_item *host, int *errno_value, int more_errno,
505 uschar *buffer, int *yield, uschar **message, BOOL *pass_message)
506 {
507 uschar *pl = US"";
508
509 if (smtp_use_pipelining &&
510 (Ustrcmp(smtp_command, "MAIL") == 0 ||
511 Ustrcmp(smtp_command, "RCPT") == 0 ||
512 Ustrcmp(smtp_command, "DATA") == 0))
513 pl = US"pipelined ";
514
515 *yield = '4'; /* Default setting is to give a temporary error */
516
517 /* Handle response timeout */
518
519 if (*errno_value == ETIMEDOUT)
520 {
521 *message = US string_sprintf("SMTP timeout after %s%s",
522 pl, smtp_command);
523 if (transport_count > 0)
524 *message = US string_sprintf("%s (%d bytes written)", *message,
525 transport_count);
526 return FALSE;
527 }
528
529 /* Handle malformed SMTP response */
530
531 if (*errno_value == ERRNO_SMTPFORMAT)
532 {
533 const uschar *malfresp = string_printing(buffer);
534 while (isspace(*malfresp)) malfresp++;
535 *message = *malfresp == 0
536 ? string_sprintf("Malformed SMTP reply (an empty line) "
537 "in response to %s%s", pl, smtp_command)
538 : string_sprintf("Malformed SMTP reply in response to %s%s: %s",
539 pl, smtp_command, malfresp);
540 return FALSE;
541 }
542
543 /* Handle a failed filter process error; can't send QUIT as we mustn't
544 end the DATA. */
545
546 if (*errno_value == ERRNO_FILTER_FAIL)
547 {
548 *message = US string_sprintf("transport filter process failed (%d)%s",
549 more_errno,
550 (more_errno == EX_EXECFAILED)? ": unable to execute command" : "");
551 return FALSE;
552 }
553
554 /* Handle a failed add_headers expansion; can't send QUIT as we mustn't
555 end the DATA. */
556
557 if (*errno_value == ERRNO_CHHEADER_FAIL)
558 {
559 *message =
560 US string_sprintf("failed to expand headers_add or headers_remove: %s",
561 expand_string_message);
562 return FALSE;
563 }
564
565 /* Handle failure to write a complete data block */
566
567 if (*errno_value == ERRNO_WRITEINCOMPLETE)
568 {
569 *message = US string_sprintf("failed to write a data block");
570 return FALSE;
571 }
572
573 #ifdef EXPERIMENTAL_INTERNATIONAL
574 /* Handle lack of advertised SMTPUTF8, for international message */
575 if (*errno_value == ERRNO_UTF8_FWD)
576 {
577 *message = US string_sprintf("utf8 support required but not offered for forwarding");
578 DEBUG(D_deliver|D_transport) debug_printf("%s\n", *message);
579 return TRUE;
580 }
581 #endif
582
583 /* Handle error responses from the remote mailer. */
584
585 if (buffer[0] != 0)
586 {
587 const uschar *s = string_printing(buffer);
588 *message = US string_sprintf("SMTP error from remote mail server after %s%s: "
589 "%s", pl, smtp_command, s);
590 *pass_message = TRUE;
591 *yield = buffer[0];
592 return TRUE;
593 }
594
595 /* No data was read. If there is no errno, this must be the EOF (i.e.
596 connection closed) case, which causes deferral. An explicit connection reset
597 error has the same effect. Otherwise, put the host's identity in the message,
598 leaving the errno value to be interpreted as well. In all cases, we have to
599 assume the connection is now dead. */
600
601 if (*errno_value == 0 || *errno_value == ECONNRESET)
602 {
603 *errno_value = ERRNO_SMTPCLOSED;
604 *message = US string_sprintf("Remote host closed connection "
605 "in response to %s%s", pl, smtp_command);
606 }
607 else *message = US string_sprintf("%s [%s]", host->name, host->address);
608
609 return FALSE;
610 }
611
612
613
614 /*************************************************
615 * Write error message to logs *
616 *************************************************/
617
618 /* This writes to the main log and to the message log.
619
620 Arguments:
621 addr the address item containing error information
622 host the current host
623
624 Returns: nothing
625 */
626
627 static void
628 write_logs(address_item *addr, host_item *host)
629 {
630 uschar * message = string_sprintf("H=%s [%s]", host->name, host->address);
631
632 if (addr->message)
633 {
634 message = string_sprintf("%s: %s", message, addr->message);
635 if (addr->basic_errno > 0)
636 message = string_sprintf("%s: %s", message, strerror(addr->basic_errno));
637 log_write(0, LOG_MAIN, "%s", message);
638 deliver_msglog("%s %s\n", tod_stamp(tod_log), message);
639 }
640 else
641 {
642 if (log_extra_selector & LX_outgoing_port)
643 message = string_sprintf("%s:%d", message,
644 host->port == PORT_NONE ? 25 : host->port);
645 log_write(0, LOG_MAIN, "%s %s", message, strerror(addr->basic_errno));
646 deliver_msglog("%s %s %s\n", tod_stamp(tod_log), message,
647 strerror(addr->basic_errno));
648 }
649 }
650
651 static void
652 msglog_line(host_item * host, uschar * message)
653 {
654 deliver_msglog("%s H=%s [%s] %s\n", tod_stamp(tod_log),
655 host->name, host->address, message);
656 }
657
658
659
660 #ifdef EXPERIMENTAL_EVENT
661 /*************************************************
662 * Post-defer action *
663 *************************************************/
664
665 /* This expands an arbitrary per-transport string.
666 It might, for example, be used to write to the database log.
667
668 Arguments:
669 addr the address item containing error information
670 host the current host
671
672 Returns: nothing
673 */
674
675 static void
676 deferred_event_raise(address_item *addr, host_item *host)
677 {
678 uschar * action = addr->transport->event_action;
679 const uschar * save_domain;
680 uschar * save_local;
681
682 if (!action)
683 return;
684
685 save_domain = deliver_domain;
686 save_local = deliver_localpart;
687
688 /*XXX would ip & port already be set up? */
689 deliver_host_address = string_copy(host->address);
690 deliver_host_port = host->port == PORT_NONE ? 25 : host->port;
691 event_defer_errno = addr->basic_errno;
692
693 router_name = addr->router->name;
694 transport_name = addr->transport->name;
695 deliver_domain = addr->domain;
696 deliver_localpart = addr->local_part;
697
698 (void) event_raise(action, US"msg:host:defer",
699 addr->message
700 ? addr->basic_errno > 0
701 ? string_sprintf("%s: %s", addr->message, strerror(addr->basic_errno))
702 : string_copy(addr->message)
703 : addr->basic_errno > 0
704 ? string_copy(US strerror(addr->basic_errno))
705 : NULL);
706
707 deliver_localpart = save_local;
708 deliver_domain = save_domain;
709 router_name = transport_name = NULL;
710 }
711 #endif
712
713 /*************************************************
714 * Synchronize SMTP responses *
715 *************************************************/
716
717 /* This function is called from smtp_deliver() to receive SMTP responses from
718 the server, and match them up with the commands to which they relate. When
719 PIPELINING is not in use, this function is called after every command, and is
720 therefore somewhat over-engineered, but it is simpler to use a single scheme
721 that works both with and without PIPELINING instead of having two separate sets
722 of code.
723
724 The set of commands that are buffered up with pipelining may start with MAIL
725 and may end with DATA; in between are RCPT commands that correspond to the
726 addresses whose status is PENDING_DEFER. All other commands (STARTTLS, AUTH,
727 etc.) are never buffered.
728
729 Errors after MAIL or DATA abort the whole process leaving the response in the
730 buffer. After MAIL, pending responses are flushed, and the original command is
731 re-instated in big_buffer for error messages. For RCPT commands, the remote is
732 permitted to reject some recipient addresses while accepting others. However
733 certain errors clearly abort the whole process. Set the value in
734 transport_return to PENDING_OK if the address is accepted. If there is a
735 subsequent general error, it will get reset accordingly. If not, it will get
736 converted to OK at the end.
737
738 Arguments:
739 addrlist the complete address list
740 include_affixes TRUE if affixes include in RCPT
741 sync_addr ptr to the ptr of the one to start scanning at (updated)
742 host the host we are connected to
743 count the number of responses to read
744 address_retry_
745 include_sender true if 4xx retry is to include the sender it its key
746 pending_MAIL true if the first response is for MAIL
747 pending_DATA 0 if last command sent was not DATA
748 +1 if previously had a good recipient
749 -1 if not previously had a good recipient
750 inblock incoming SMTP block
751 timeout timeout value
752 buffer buffer for reading response
753 buffsize size of buffer
754
755 Returns: 3 if at least one address had 2xx and one had 5xx
756 2 if at least one address had 5xx but none had 2xx
757 1 if at least one host had a 2xx response, but none had 5xx
758 0 no address had 2xx or 5xx but no errors (all 4xx, or just DATA)
759 -1 timeout while reading RCPT response
760 -2 I/O or other non-response error for RCPT
761 -3 DATA or MAIL failed - errno and buffer set
762 */
763
764 static int
765 sync_responses(address_item *addrlist, BOOL include_affixes,
766 address_item **sync_addr, host_item *host, int count,
767 BOOL address_retry_include_sender, BOOL pending_MAIL,
768 int pending_DATA, smtp_inblock *inblock, int timeout, uschar *buffer,
769 int buffsize)
770 {
771 address_item *addr = *sync_addr;
772 int yield = 0;
773
774 /* Handle the response for a MAIL command. On error, reinstate the original
775 command in big_buffer for error message use, and flush any further pending
776 responses before returning, except after I/O errors and timeouts. */
777
778 if (pending_MAIL)
779 {
780 count--;
781 if (!smtp_read_response(inblock, buffer, buffsize, '2', timeout))
782 {
783 Ustrcpy(big_buffer, mail_command); /* Fits, because it came from there! */
784 if (errno == 0 && buffer[0] != 0)
785 {
786 uschar flushbuffer[4096];
787 int save_errno = 0;
788 if (buffer[0] == '4')
789 {
790 save_errno = ERRNO_MAIL4XX;
791 addr->more_errno |= ((buffer[1] - '0')*10 + buffer[2] - '0') << 8;
792 }
793 while (count-- > 0)
794 {
795 if (!smtp_read_response(inblock, flushbuffer, sizeof(flushbuffer),
796 '2', timeout)
797 && (errno != 0 || flushbuffer[0] == 0))
798 break;
799 }
800 errno = save_errno;
801 }
802
803 if (pending_DATA) count--; /* Number of RCPT responses to come */
804 while (count-- > 0) /* Mark any pending addrs with the host used */
805 {
806 while (addr->transport_return != PENDING_DEFER) addr = addr->next;
807 addr->host_used = host;
808 addr = addr->next;
809 }
810 return -3;
811 }
812 }
813
814 if (pending_DATA) count--; /* Number of RCPT responses to come */
815
816 /* Read and handle the required number of RCPT responses, matching each one up
817 with an address by scanning for the next address whose status is PENDING_DEFER.
818 */
819
820 while (count-- > 0)
821 {
822 while (addr->transport_return != PENDING_DEFER) addr = addr->next;
823
824 /* The address was accepted */
825 addr->host_used = host;
826
827 if (smtp_read_response(inblock, buffer, buffsize, '2', timeout))
828 {
829 yield |= 1;
830 addr->transport_return = PENDING_OK;
831
832 /* If af_dr_retry_exists is set, there was a routing delay on this address;
833 ensure that any address-specific retry record is expunged. We do this both
834 for the basic key and for the version that also includes the sender. */
835
836 if (testflag(addr, af_dr_retry_exists))
837 {
838 uschar *altkey = string_sprintf("%s:<%s>", addr->address_retry_key,
839 sender_address);
840 retry_add_item(addr, altkey, rf_delete);
841 retry_add_item(addr, addr->address_retry_key, rf_delete);
842 }
843 }
844
845 /* Timeout while reading the response */
846
847 else if (errno == ETIMEDOUT)
848 {
849 uschar *message = string_sprintf("SMTP timeout after RCPT TO:<%s>",
850 transport_rcpt_address(addr, include_affixes));
851 set_errno(addrlist, ETIMEDOUT, message, DEFER, FALSE, NULL);
852 retry_add_item(addr, addr->address_retry_key, 0);
853 update_waiting = FALSE;
854 return -1;
855 }
856
857 /* Handle other errors in obtaining an SMTP response by returning -1. This
858 will cause all the addresses to be deferred. Restore the SMTP command in
859 big_buffer for which we are checking the response, so the error message
860 makes sense. */
861
862 else if (errno != 0 || buffer[0] == 0)
863 {
864 string_format(big_buffer, big_buffer_size, "RCPT TO:<%s>",
865 transport_rcpt_address(addr, include_affixes));
866 return -2;
867 }
868
869 /* Handle SMTP permanent and temporary response codes. */
870
871 else
872 {
873 addr->message =
874 string_sprintf("SMTP error from remote mail server after RCPT TO:<%s>: "
875 "%s", transport_rcpt_address(addr, include_affixes),
876 string_printing(buffer));
877 setflag(addr, af_pass_message);
878 msglog_line(host, addr->message);
879
880 /* The response was 5xx */
881
882 if (buffer[0] == '5')
883 {
884 addr->transport_return = FAIL;
885 yield |= 2;
886 }
887
888 /* The response was 4xx */
889
890 else
891 {
892 addr->transport_return = DEFER;
893 addr->basic_errno = ERRNO_RCPT4XX;
894 addr->more_errno |= ((buffer[1] - '0')*10 + buffer[2] - '0') << 8;
895
896 /* Log temporary errors if there are more hosts to be tried.
897 If not, log this last one in the == line. */
898
899 if (host->next)
900 log_write(0, LOG_MAIN, "H=%s [%s]: %s", host->name, host->address, addr->message);
901
902 /* Do not put this message on the list of those waiting for specific
903 hosts, as otherwise it is likely to be tried too often. */
904
905 update_waiting = FALSE;
906
907 /* Add a retry item for the address so that it doesn't get tried again
908 too soon. If address_retry_include_sender is true, add the sender address
909 to the retry key. */
910
911 if (address_retry_include_sender)
912 {
913 uschar *altkey = string_sprintf("%s:<%s>", addr->address_retry_key,
914 sender_address);
915 retry_add_item(addr, altkey, 0);
916 }
917 else retry_add_item(addr, addr->address_retry_key, 0);
918 }
919 }
920 } /* Loop for next RCPT response */
921
922 /* Update where to start at for the next block of responses, unless we
923 have already handled all the addresses. */
924
925 if (addr != NULL) *sync_addr = addr->next;
926
927 /* Handle a response to DATA. If we have not had any good recipients, either
928 previously or in this block, the response is ignored. */
929
930 if (pending_DATA != 0 &&
931 !smtp_read_response(inblock, buffer, buffsize, '3', timeout))
932 {
933 int code;
934 uschar *msg;
935 BOOL pass_message;
936 if (pending_DATA > 0 || (yield & 1) != 0)
937 {
938 if (errno == 0 && buffer[0] == '4')
939 {
940 errno = ERRNO_DATA4XX;
941 addrlist->more_errno |= ((buffer[1] - '0')*10 + buffer[2] - '0') << 8;
942 }
943 return -3;
944 }
945 (void)check_response(host, &errno, 0, buffer, &code, &msg, &pass_message);
946 DEBUG(D_transport) debug_printf("%s\nerror for DATA ignored: pipelining "
947 "is in use and there were no good recipients\n", msg);
948 }
949
950 /* All responses read and handled; MAIL (if present) received 2xx and DATA (if
951 present) received 3xx. If any RCPTs were handled and yielded anything other
952 than 4xx, yield will be set non-zero. */
953
954 return yield;
955 }
956
957
958
959 /* Do the client side of smtp-level authentication */
960 /*
961 Arguments:
962 buffer EHLO response from server (gets overwritten)
963 addrlist chain of potential addresses to deliver
964 host host to deliver to
965 ob transport options
966 ibp, obp comms channel control blocks
967
968 Returns:
969 OK Success, or failed (but not required): global "smtp_authenticated" set
970 DEFER Failed authentication (and was required)
971 ERROR Internal problem
972
973 FAIL_SEND Failed communications - transmit
974 FAIL - response
975 */
976
977 int
978 smtp_auth(uschar *buffer, unsigned bufsize, address_item *addrlist, host_item *host,
979 smtp_transport_options_block *ob, BOOL is_esmtp,
980 smtp_inblock *ibp, smtp_outblock *obp)
981 {
982 int require_auth;
983 uschar *fail_reason = US"server did not advertise AUTH support";
984
985 smtp_authenticated = FALSE;
986 client_authenticator = client_authenticated_id = client_authenticated_sender = NULL;
987 require_auth = verify_check_given_host(&ob->hosts_require_auth, host);
988
989 if (is_esmtp && !regex_AUTH) regex_AUTH =
990 regex_must_compile(US"\\n250[\\s\\-]AUTH\\s+([\\-\\w\\s]+)(?:\\n|$)",
991 FALSE, TRUE);
992
993 if (is_esmtp && regex_match_and_setup(regex_AUTH, buffer, 0, -1))
994 {
995 uschar *names = string_copyn(expand_nstring[1], expand_nlength[1]);
996 expand_nmax = -1; /* reset */
997
998 /* Must not do this check until after we have saved the result of the
999 regex match above. */
1000
1001 if (require_auth == OK ||
1002 verify_check_given_host(&ob->hosts_try_auth, host) == OK)
1003 {
1004 auth_instance *au;
1005 fail_reason = US"no common mechanisms were found";
1006
1007 DEBUG(D_transport) debug_printf("scanning authentication mechanisms\n");
1008
1009 /* Scan the configured authenticators looking for one which is configured
1010 for use as a client, which is not suppressed by client_condition, and
1011 whose name matches an authentication mechanism supported by the server.
1012 If one is found, attempt to authenticate by calling its client function.
1013 */
1014
1015 for (au = auths; !smtp_authenticated && au != NULL; au = au->next)
1016 {
1017 uschar *p = names;
1018 if (!au->client ||
1019 (au->client_condition != NULL &&
1020 !expand_check_condition(au->client_condition, au->name,
1021 US"client authenticator")))
1022 {
1023 DEBUG(D_transport) debug_printf("skipping %s authenticator: %s\n",
1024 au->name,
1025 (au->client)? "client_condition is false" :
1026 "not configured as a client");
1027 continue;
1028 }
1029
1030 /* Loop to scan supported server mechanisms */
1031
1032 while (*p != 0)
1033 {
1034 int rc;
1035 int len = Ustrlen(au->public_name);
1036 while (isspace(*p)) p++;
1037
1038 if (strncmpic(au->public_name, p, len) != 0 ||
1039 (p[len] != 0 && !isspace(p[len])))
1040 {
1041 while (*p != 0 && !isspace(*p)) p++;
1042 continue;
1043 }
1044
1045 /* Found data for a listed mechanism. Call its client entry. Set
1046 a flag in the outblock so that data is overwritten after sending so
1047 that reflections don't show it. */
1048
1049 fail_reason = US"authentication attempt(s) failed";
1050 obp->authenticating = TRUE;
1051 rc = (au->info->clientcode)(au, ibp, obp,
1052 ob->command_timeout, buffer, bufsize);
1053 obp->authenticating = FALSE;
1054 DEBUG(D_transport) debug_printf("%s authenticator yielded %d\n",
1055 au->name, rc);
1056
1057 /* A temporary authentication failure must hold up delivery to
1058 this host. After a permanent authentication failure, we carry on
1059 to try other authentication methods. If all fail hard, try to
1060 deliver the message unauthenticated unless require_auth was set. */
1061
1062 switch(rc)
1063 {
1064 case OK:
1065 smtp_authenticated = TRUE; /* stops the outer loop */
1066 client_authenticator = au->name;
1067 if (au->set_client_id != NULL)
1068 client_authenticated_id = expand_string(au->set_client_id);
1069 break;
1070
1071 /* Failure after writing a command */
1072
1073 case FAIL_SEND:
1074 return FAIL_SEND;
1075
1076 /* Failure after reading a response */
1077
1078 case FAIL:
1079 if (errno != 0 || buffer[0] != '5') return FAIL;
1080 log_write(0, LOG_MAIN, "%s authenticator failed H=%s [%s] %s",
1081 au->name, host->name, host->address, buffer);
1082 break;
1083
1084 /* Failure by some other means. In effect, the authenticator
1085 decided it wasn't prepared to handle this case. Typically this
1086 is the result of "fail" in an expansion string. Do we need to
1087 log anything here? Feb 2006: a message is now put in the buffer
1088 if logging is required. */
1089
1090 case CANCELLED:
1091 if (*buffer != 0)
1092 log_write(0, LOG_MAIN, "%s authenticator cancelled "
1093 "authentication H=%s [%s] %s", au->name, host->name,
1094 host->address, buffer);
1095 break;
1096
1097 /* Internal problem, message in buffer. */
1098
1099 case ERROR:
1100 set_errno(addrlist, ERRNO_AUTHPROB, string_copy(buffer),
1101 DEFER, FALSE, NULL);
1102 return ERROR;
1103 }
1104
1105 break; /* If not authenticated, try next authenticator */
1106 } /* Loop for scanning supported server mechanisms */
1107 } /* Loop for further authenticators */
1108 }
1109 }
1110
1111 /* If we haven't authenticated, but are required to, give up. */
1112
1113 if (require_auth == OK && !smtp_authenticated)
1114 {
1115 set_errno(addrlist, ERRNO_AUTHFAIL,
1116 string_sprintf("authentication required but %s", fail_reason), DEFER,
1117 FALSE, NULL);
1118 return DEFER;
1119 }
1120
1121 return OK;
1122 }
1123
1124
1125 /* Construct AUTH appendix string for MAIL TO */
1126 /*
1127 Arguments
1128 buffer to build string
1129 addrlist chain of potential addresses to deliver
1130 ob transport options
1131
1132 Globals smtp_authenticated
1133 client_authenticated_sender
1134 Return True on error, otherwise buffer has (possibly empty) terminated string
1135 */
1136
1137 BOOL
1138 smtp_mail_auth_str(uschar *buffer, unsigned bufsize, address_item *addrlist,
1139 smtp_transport_options_block *ob)
1140 {
1141 uschar *local_authenticated_sender = authenticated_sender;
1142
1143 #ifdef notdef
1144 debug_printf("smtp_mail_auth_str: as<%s> os<%s> SA<%s>\n", authenticated_sender, ob->authenticated_sender, smtp_authenticated?"Y":"N");
1145 #endif
1146
1147 if (ob->authenticated_sender != NULL)
1148 {
1149 uschar *new = expand_string(ob->authenticated_sender);
1150 if (new == NULL)
1151 {
1152 if (!expand_string_forcedfail)
1153 {
1154 uschar *message = string_sprintf("failed to expand "
1155 "authenticated_sender: %s", expand_string_message);
1156 set_errno(addrlist, ERRNO_EXPANDFAIL, message, DEFER, FALSE, NULL);
1157 return TRUE;
1158 }
1159 }
1160 else if (new[0] != 0) local_authenticated_sender = new;
1161 }
1162
1163 /* Add the authenticated sender address if present */
1164
1165 if ((smtp_authenticated || ob->authenticated_sender_force) &&
1166 local_authenticated_sender != NULL)
1167 {
1168 string_format(buffer, bufsize, " AUTH=%s",
1169 auth_xtextencode(local_authenticated_sender,
1170 Ustrlen(local_authenticated_sender)));
1171 client_authenticated_sender = string_copy(local_authenticated_sender);
1172 }
1173 else
1174 *buffer= 0;
1175
1176 return FALSE;
1177 }
1178
1179
1180
1181 #ifdef EXPERIMENTAL_DANE
1182 int
1183 tlsa_lookup(const host_item * host, dns_answer * dnsa,
1184 BOOL dane_required, BOOL * dane)
1185 {
1186 /* move this out to host.c given the similarity to dns_lookup() ? */
1187 uschar buffer[300];
1188 const uschar * fullname = buffer;
1189
1190 /* TLSA lookup string */
1191 (void)sprintf(CS buffer, "_%d._tcp.%.256s", host->port, host->name);
1192
1193 switch (dns_lookup(dnsa, buffer, T_TLSA, &fullname))
1194 {
1195 case DNS_AGAIN:
1196 return DEFER; /* just defer this TLS'd conn */
1197
1198 default:
1199 case DNS_FAIL:
1200 if (dane_required)
1201 {
1202 log_write(0, LOG_MAIN, "DANE error: TLSA lookup failed");
1203 return FAIL;
1204 }
1205 break;
1206
1207 case DNS_SUCCEED:
1208 if (!dns_is_secure(dnsa))
1209 {
1210 log_write(0, LOG_MAIN, "DANE error: TLSA lookup not DNSSEC");
1211 return DEFER;
1212 }
1213 *dane = TRUE;
1214 break;
1215 }
1216 return OK;
1217 }
1218 #endif
1219
1220
1221
1222 typedef struct smtp_compare_s
1223 {
1224 uschar *current_sender_address;
1225 struct transport_instance *tblock;
1226 } smtp_compare_t;
1227
1228 /*
1229 Create a unique string that identifies this message, it is based on
1230 sender_address, helo_data and tls_certificate if enabled. */
1231
1232 static uschar *
1233 smtp_local_identity(uschar * sender, struct transport_instance * tblock)
1234 {
1235 address_item * addr1;
1236 uschar * if1 = US"";
1237 uschar * helo1 = US"";
1238 #ifdef SUPPORT_TLS
1239 uschar * tlsc1 = US"";
1240 #endif
1241 uschar * save_sender_address = sender_address;
1242 uschar * local_identity = NULL;
1243 smtp_transport_options_block * ob =
1244 (smtp_transport_options_block *)tblock->options_block;
1245
1246 sender_address = sender;
1247
1248 addr1 = deliver_make_addr (sender, TRUE);
1249 deliver_set_expansions(addr1);
1250
1251 if (ob->interface)
1252 if1 = expand_string(ob->interface);
1253
1254 if (ob->helo_data)
1255 helo1 = expand_string(ob->helo_data);
1256
1257 #ifdef SUPPORT_TLS
1258 if (ob->tls_certificate)
1259 tlsc1 = expand_string(ob->tls_certificate);
1260 local_identity = string_sprintf ("%s^%s^%s", if1, helo1, tlsc1);
1261 #else
1262 local_identity = string_sprintf ("%s^%s", if1, helo1);
1263 #endif
1264
1265 deliver_set_expansions(NULL);
1266 sender_address = save_sender_address;
1267
1268 return local_identity;
1269 }
1270
1271
1272
1273 /* This routine is a callback that is called from transport_check_waiting.
1274 This function will evaluate the incoming message versus the previous
1275 message. If the incoming message is using a different local identity then
1276 we will veto this new message. */
1277
1278 static BOOL
1279 smtp_are_same_identities(uschar * message_id, smtp_compare_t * s_compare)
1280 {
1281 uschar * save_sender_address = sender_address;
1282 uschar * current_local_identity =
1283 smtp_local_identity(s_compare->current_sender_address, s_compare->tblock);
1284 uschar * new_sender_address = deliver_get_sender_address(message_id);
1285 uschar * message_local_identity =
1286 smtp_local_identity(new_sender_address, s_compare->tblock);
1287
1288 sender_address = save_sender_address;
1289
1290 return Ustrcmp(current_local_identity, message_local_identity) == 0;
1291 }
1292
1293
1294
1295 /*************************************************
1296 * Deliver address list to given host *
1297 *************************************************/
1298
1299 /* If continue_hostname is not null, we get here only when continuing to
1300 deliver down an existing channel. The channel was passed as the standard
1301 input. TLS is never active on a passed channel; the previous process always
1302 closes it down before passing the connection on.
1303
1304 Otherwise, we have to make a connection to the remote host, and do the
1305 initial protocol exchange.
1306
1307 When running as an MUA wrapper, if the sender or any recipient is rejected,
1308 temporarily or permanently, we force failure for all recipients.
1309
1310 Arguments:
1311 addrlist chain of potential addresses to deliver; only those whose
1312 transport_return field is set to PENDING_DEFER are currently
1313 being processed; others should be skipped - they have either
1314 been delivered to an earlier host or IP address, or been
1315 failed by one of them.
1316 host host to deliver to
1317 host_af AF_INET or AF_INET6
1318 port default TCP/IP port to use, in host byte order
1319 interface interface to bind to, or NULL
1320 tblock transport instance block
1321 message_defer set TRUE if yield is OK, but all addresses were deferred
1322 because of a non-recipient, non-host failure, that is, a
1323 4xx response to MAIL FROM, DATA, or ".". This is a defer
1324 that is specific to the message.
1325 suppress_tls if TRUE, don't attempt a TLS connection - this is set for
1326 a second attempt after TLS initialization fails
1327
1328 Returns: OK - the connection was made and the delivery attempted;
1329 the result for each address is in its data block.
1330 DEFER - the connection could not be made, or something failed
1331 while setting up the SMTP session, or there was a
1332 non-message-specific error, such as a timeout.
1333 ERROR - a filter command is specified for this transport,
1334 and there was a problem setting it up; OR helo_data
1335 or add_headers or authenticated_sender is specified
1336 for this transport, and the string failed to expand
1337 */
1338
1339 static int
1340 smtp_deliver(address_item *addrlist, host_item *host, int host_af, int port,
1341 uschar *interface, transport_instance *tblock,
1342 BOOL *message_defer, BOOL suppress_tls)
1343 {
1344 address_item *addr;
1345 address_item *sync_addr;
1346 address_item *first_addr = addrlist;
1347 int yield = OK;
1348 int address_count;
1349 int save_errno;
1350 int rc;
1351 time_t start_delivery_time = time(NULL);
1352 smtp_transport_options_block *ob =
1353 (smtp_transport_options_block *)(tblock->options_block);
1354 BOOL lmtp = strcmpic(ob->protocol, US"lmtp") == 0;
1355 BOOL smtps = strcmpic(ob->protocol, US"smtps") == 0;
1356 BOOL ok = FALSE;
1357 BOOL send_rset = TRUE;
1358 BOOL send_quit = TRUE;
1359 BOOL setting_up = TRUE;
1360 BOOL completed_address = FALSE;
1361 BOOL esmtp = TRUE;
1362 BOOL pending_MAIL;
1363 BOOL pass_message = FALSE;
1364 #ifndef DISABLE_PRDR
1365 BOOL prdr_offered = FALSE;
1366 BOOL prdr_active;
1367 #endif
1368 #ifdef EXPERIMENTAL_INTERNATIONAL
1369 BOOL utf8_needed = FALSE;
1370 BOOL utf8_offered = FALSE;
1371 #endif
1372 BOOL dsn_all_lasthop = TRUE;
1373 #if defined(SUPPORT_TLS) && defined(EXPERIMENTAL_DANE)
1374 BOOL dane = FALSE;
1375 BOOL dane_required;
1376 dns_answer tlsa_dnsa;
1377 #endif
1378 smtp_inblock inblock;
1379 smtp_outblock outblock;
1380 int max_rcpt = tblock->max_addresses;
1381 uschar *igquotstr = US"";
1382
1383 uschar *helo_data = NULL;
1384
1385 uschar *message = NULL;
1386 uschar new_message_id[MESSAGE_ID_LENGTH + 1];
1387 uschar *p;
1388 uschar buffer[4096];
1389 uschar inbuffer[4096];
1390 uschar outbuffer[4096];
1391 address_item * current_address;
1392
1393 suppress_tls = suppress_tls; /* stop compiler warning when no TLS support */
1394
1395 *message_defer = FALSE;
1396 smtp_command = US"initial connection";
1397 if (max_rcpt == 0) max_rcpt = 999999;
1398
1399 /* Set up the buffer for reading SMTP response packets. */
1400
1401 inblock.buffer = inbuffer;
1402 inblock.buffersize = sizeof(inbuffer);
1403 inblock.ptr = inbuffer;
1404 inblock.ptrend = inbuffer;
1405
1406 /* Set up the buffer for holding SMTP commands while pipelining */
1407
1408 outblock.buffer = outbuffer;
1409 outblock.buffersize = sizeof(outbuffer);
1410 outblock.ptr = outbuffer;
1411 outblock.cmd_count = 0;
1412 outblock.authenticating = FALSE;
1413
1414 /* Reset the parameters of a TLS session. */
1415
1416 tls_out.bits = 0;
1417 tls_out.cipher = NULL; /* the one we may use for this transport */
1418 tls_out.ourcert = NULL;
1419 tls_out.peercert = NULL;
1420 tls_out.peerdn = NULL;
1421 #if defined(SUPPORT_TLS) && !defined(USE_GNUTLS)
1422 tls_out.sni = NULL;
1423 #endif
1424 tls_out.ocsp = OCSP_NOT_REQ;
1425
1426 /* Flip the legacy TLS-related variables over to the outbound set in case
1427 they're used in the context of the transport. Don't bother resetting
1428 afterward as we're in a subprocess. */
1429
1430 tls_modify_variables(&tls_out);
1431
1432 #ifndef SUPPORT_TLS
1433 if (smtps)
1434 {
1435 set_errno(addrlist, ERRNO_TLSFAILURE, US"TLS support not available",
1436 DEFER, FALSE, NULL);
1437 return ERROR;
1438 }
1439 #endif
1440
1441 /* Make a connection to the host if this isn't a continued delivery, and handle
1442 the initial interaction and HELO/EHLO/LHLO. Connect timeout errors are handled
1443 specially so they can be identified for retries. */
1444
1445 if (continue_hostname == NULL)
1446 {
1447 /* This puts port into host->port */
1448 inblock.sock = outblock.sock =
1449 smtp_connect(host, host_af, port, interface, ob->connect_timeout, tblock);
1450
1451 if (inblock.sock < 0)
1452 {
1453 set_errno(addrlist, (errno == ETIMEDOUT)? ERRNO_CONNECTTIMEOUT : errno,
1454 NULL, DEFER, FALSE, NULL);
1455 return DEFER;
1456 }
1457
1458 #if defined(SUPPORT_TLS) && defined(EXPERIMENTAL_DANE)
1459 {
1460 tls_out.dane_verified = FALSE;
1461 tls_out.tlsa_usage = 0;
1462
1463 dane_required = verify_check_given_host(&ob->hosts_require_dane, host) == OK;
1464
1465 if (host->dnssec == DS_YES)
1466 {
1467 if( ( dane_required
1468 || verify_check_given_host(&ob->hosts_try_dane, host) == OK
1469 )
1470 && (rc = tlsa_lookup(host, &tlsa_dnsa, dane_required, &dane)) != OK
1471 )
1472 return rc;
1473 }
1474 else if (dane_required)
1475 {
1476 log_write(0, LOG_MAIN, "DANE error: %s lookup not DNSSEC", host->name);
1477 return FAIL;
1478 }
1479
1480 if (dane)
1481 ob->tls_tempfail_tryclear = FALSE;
1482 }
1483 #endif /*DANE*/
1484
1485 /* Expand the greeting message while waiting for the initial response. (Makes
1486 sense if helo_data contains ${lookup dnsdb ...} stuff). The expansion is
1487 delayed till here so that $sending_interface and $sending_port are set. */
1488
1489 helo_data = expand_string(ob->helo_data);
1490 #ifdef EXPERIMENTAL_INTERNATIONAL
1491 if (helo_data)
1492 {
1493 uschar * errstr = NULL;
1494 if ((helo_data = string_domain_utf8_to_alabel(helo_data, &errstr)), errstr)
1495 {
1496 errstr = string_sprintf("failed to expand helo_data: %s", errstr);
1497 set_errno(addrlist, ERRNO_EXPANDFAIL, errstr, DEFER, FALSE, NULL);
1498 yield = DEFER;
1499 goto SEND_QUIT;
1500 }
1501 }
1502 #endif
1503
1504 /* The first thing is to wait for an initial OK response. The dreaded "goto"
1505 is nevertheless a reasonably clean way of programming this kind of logic,
1506 where you want to escape on any error. */
1507
1508 if (!smtps)
1509 {
1510 if (!smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
1511 ob->command_timeout)) goto RESPONSE_FAILED;
1512
1513 #ifdef EXPERIMENTAL_EVENT
1514 {
1515 uschar * s;
1516 lookup_dnssec_authenticated = host->dnssec==DS_YES ? US"yes"
1517 : host->dnssec==DS_NO ? US"no" : NULL;
1518 s = event_raise(tblock->event_action, US"smtp:connect", buffer);
1519 if (s)
1520 {
1521 set_errno(addrlist, ERRNO_EXPANDFAIL,
1522 string_sprintf("deferred by smtp:connect event expansion: %s", s),
1523 DEFER, FALSE, NULL);
1524 yield = DEFER;
1525 goto SEND_QUIT;
1526 }
1527 }
1528 #endif
1529
1530 /* Now check if the helo_data expansion went well, and sign off cleanly if
1531 it didn't. */
1532
1533 if (helo_data == NULL)
1534 {
1535 uschar *message = string_sprintf("failed to expand helo_data: %s",
1536 expand_string_message);
1537 set_errno(addrlist, ERRNO_EXPANDFAIL, message, DEFER, FALSE, NULL);
1538 yield = DEFER;
1539 goto SEND_QUIT;
1540 }
1541 }
1542
1543 /** Debugging without sending a message
1544 addrlist->transport_return = DEFER;
1545 goto SEND_QUIT;
1546 **/
1547
1548 /* Errors that occur after this point follow an SMTP command, which is
1549 left in big_buffer by smtp_write_command() for use in error messages. */
1550
1551 smtp_command = big_buffer;
1552
1553 /* Tell the remote who we are...
1554
1555 February 1998: A convention has evolved that ESMTP-speaking MTAs include the
1556 string "ESMTP" in their greeting lines, so make Exim send EHLO if the
1557 greeting is of this form. The assumption was that the far end supports it
1558 properly... but experience shows that there are some that give 5xx responses,
1559 even though the banner includes "ESMTP" (there's a bloody-minded one that
1560 says "ESMTP not spoken here"). Cope with that case.
1561
1562 September 2000: Time has passed, and it seems reasonable now to always send
1563 EHLO at the start. It is also convenient to make the change while installing
1564 the TLS stuff.
1565
1566 July 2003: Joachim Wieland met a broken server that advertises "PIPELINING"
1567 but times out after sending MAIL FROM, RCPT TO and DATA all together. There
1568 would be no way to send out the mails, so there is now a host list
1569 "hosts_avoid_esmtp" that disables ESMTP for special hosts and solves the
1570 PIPELINING problem as well. Maybe it can also be useful to cure other
1571 problems with broken servers.
1572
1573 Exim originally sent "Helo" at this point and ran for nearly a year that way.
1574 Then somebody tried it with a Microsoft mailer... It seems that all other
1575 mailers use upper case for some reason (the RFC is quite clear about case
1576 independence) so, for peace of mind, I gave in. */
1577
1578 esmtp = verify_check_given_host(&ob->hosts_avoid_esmtp, host) != OK;
1579
1580 /* Alas; be careful, since this goto is not an error-out, so conceivably
1581 we might set data between here and the target which we assume to exist
1582 and be usable. I can see this coming back to bite us. */
1583 #ifdef SUPPORT_TLS
1584 if (smtps)
1585 {
1586 tls_offered = TRUE;
1587 suppress_tls = FALSE;
1588 ob->tls_tempfail_tryclear = FALSE;
1589 smtp_command = US"SSL-on-connect";
1590 goto TLS_NEGOTIATE;
1591 }
1592 #endif
1593
1594 if (esmtp)
1595 {
1596 if (smtp_write_command(&outblock, FALSE, "%s %s\r\n",
1597 lmtp? "LHLO" : "EHLO", helo_data) < 0)
1598 goto SEND_FAILED;
1599 if (!smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
1600 ob->command_timeout))
1601 {
1602 if (errno != 0 || buffer[0] == 0 || lmtp) goto RESPONSE_FAILED;
1603 esmtp = FALSE;
1604 }
1605 }
1606 else
1607 {
1608 DEBUG(D_transport)
1609 debug_printf("not sending EHLO (host matches hosts_avoid_esmtp)\n");
1610 }
1611
1612 if (!esmtp)
1613 {
1614 if (smtp_write_command(&outblock, FALSE, "HELO %s\r\n", helo_data) < 0)
1615 goto SEND_FAILED;
1616 if (!smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
1617 ob->command_timeout)) goto RESPONSE_FAILED;
1618 }
1619
1620 /* Set IGNOREQUOTA if the response to LHLO specifies support and the
1621 lmtp_ignore_quota option was set. */
1622
1623 igquotstr = (lmtp && ob->lmtp_ignore_quota &&
1624 pcre_exec(regex_IGNOREQUOTA, NULL, CS buffer, Ustrlen(CS buffer), 0,
1625 PCRE_EOPT, NULL, 0) >= 0)? US" IGNOREQUOTA" : US"";
1626
1627 /* Set tls_offered if the response to EHLO specifies support for STARTTLS. */
1628
1629 #ifdef SUPPORT_TLS
1630 tls_offered = esmtp &&
1631 pcre_exec(regex_STARTTLS, NULL, CS buffer, Ustrlen(buffer), 0,
1632 PCRE_EOPT, NULL, 0) >= 0;
1633 #endif
1634
1635 #ifndef DISABLE_PRDR
1636 prdr_offered = esmtp
1637 && pcre_exec(regex_PRDR, NULL, CS buffer, Ustrlen(buffer), 0,
1638 PCRE_EOPT, NULL, 0) >= 0
1639 && verify_check_given_host(&ob->hosts_try_prdr, host) == OK;
1640
1641 if (prdr_offered)
1642 {DEBUG(D_transport) debug_printf("PRDR usable\n");}
1643 #endif
1644
1645 #ifdef EXPERIMENTAL_INTERNATIONAL
1646 if (addrlist->prop.utf8_msg)
1647 {
1648 utf8_needed = !addrlist->prop.utf8_downcvt
1649 && !addrlist->prop.utf8_downcvt_maybe;
1650 DEBUG(D_transport) if (!utf8_needed) debug_printf("utf8: %s downconvert\n",
1651 addrlist->prop.utf8_downcvt ? "mandatory" : "optional");
1652
1653 utf8_offered = esmtp
1654 && pcre_exec(regex_UTF8, NULL, CS buffer, Ustrlen(buffer), 0,
1655 PCRE_EOPT, NULL, 0) >= 0;
1656 }
1657 #endif
1658 }
1659
1660 /* For continuing deliveries down the same channel, the socket is the standard
1661 input, and we don't need to redo EHLO here (but may need to do so for TLS - see
1662 below). Set up the pointer to where subsequent commands will be left, for
1663 error messages. Note that smtp_use_size and smtp_use_pipelining will have been
1664 set from the command line if they were set in the process that passed the
1665 connection on. */
1666
1667 else
1668 {
1669 inblock.sock = outblock.sock = fileno(stdin);
1670 smtp_command = big_buffer;
1671 host->port = port; /* Record the port that was used */
1672 }
1673
1674 /* If TLS is available on this connection, whether continued or not, attempt to
1675 start up a TLS session, unless the host is in hosts_avoid_tls. If successful,
1676 send another EHLO - the server may give a different answer in secure mode. We
1677 use a separate buffer for reading the response to STARTTLS so that if it is
1678 negative, the original EHLO data is available for subsequent analysis, should
1679 the client not be required to use TLS. If the response is bad, copy the buffer
1680 for error analysis. */
1681
1682 #ifdef SUPPORT_TLS
1683 if ( tls_offered
1684 && !suppress_tls
1685 && verify_check_given_host(&ob->hosts_avoid_tls, host) != OK)
1686 {
1687 uschar buffer2[4096];
1688 if (smtp_write_command(&outblock, FALSE, "STARTTLS\r\n") < 0)
1689 goto SEND_FAILED;
1690
1691 /* If there is an I/O error, transmission of this message is deferred. If
1692 there is a temporary rejection of STARRTLS and tls_tempfail_tryclear is
1693 false, we also defer. However, if there is a temporary rejection of STARTTLS
1694 and tls_tempfail_tryclear is true, or if there is an outright rejection of
1695 STARTTLS, we carry on. This means we will try to send the message in clear,
1696 unless the host is in hosts_require_tls (tested below). */
1697
1698 if (!smtp_read_response(&inblock, buffer2, sizeof(buffer2), '2',
1699 ob->command_timeout))
1700 {
1701 if (errno != 0 || buffer2[0] == 0 ||
1702 (buffer2[0] == '4' && !ob->tls_tempfail_tryclear))
1703 {
1704 Ustrncpy(buffer, buffer2, sizeof(buffer));
1705 goto RESPONSE_FAILED;
1706 }
1707 }
1708
1709 /* STARTTLS accepted: try to negotiate a TLS session. */
1710
1711 else
1712 TLS_NEGOTIATE:
1713 {
1714 int rc = tls_client_start(inblock.sock, host, addrlist, tblock
1715 # ifdef EXPERIMENTAL_DANE
1716 , dane ? &tlsa_dnsa : NULL
1717 # endif
1718 );
1719
1720 /* TLS negotiation failed; give an error. From outside, this function may
1721 be called again to try in clear on a new connection, if the options permit
1722 it for this host. */
1723
1724 if (rc != OK)
1725 {
1726 # ifdef EXPERIMENTAL_DANE
1727 if (rc == DEFER && dane && !dane_required)
1728 {
1729 log_write(0, LOG_MAIN, "DANE attempt failed;"
1730 " trying CA-root TLS to %s [%s] (not in hosts_require_dane)",
1731 host->name, host->address);
1732 dane = FALSE;
1733 goto TLS_NEGOTIATE;
1734 }
1735 # endif
1736
1737 save_errno = ERRNO_TLSFAILURE;
1738 message = US"failure while setting up TLS session";
1739 send_quit = FALSE;
1740 goto TLS_FAILED;
1741 }
1742
1743 /* TLS session is set up */
1744
1745 for (addr = addrlist; addr != NULL; addr = addr->next)
1746 if (addr->transport_return == PENDING_DEFER)
1747 {
1748 addr->cipher = tls_out.cipher;
1749 addr->ourcert = tls_out.ourcert;
1750 addr->peercert = tls_out.peercert;
1751 addr->peerdn = tls_out.peerdn;
1752 addr->ocsp = tls_out.ocsp;
1753 }
1754 }
1755 }
1756
1757 /* if smtps, we'll have smtp_command set to something else; always safe to
1758 reset it here. */
1759 smtp_command = big_buffer;
1760
1761 /* If we started TLS, redo the EHLO/LHLO exchange over the secure channel. If
1762 helo_data is null, we are dealing with a connection that was passed from
1763 another process, and so we won't have expanded helo_data above. We have to
1764 expand it here. $sending_ip_address and $sending_port are set up right at the
1765 start of the Exim process (in exim.c). */
1766
1767 if (tls_out.active >= 0)
1768 {
1769 char *greeting_cmd;
1770 if (helo_data == NULL)
1771 {
1772 helo_data = expand_string(ob->helo_data);
1773 if (helo_data == NULL)
1774 {
1775 uschar *message = string_sprintf("failed to expand helo_data: %s",
1776 expand_string_message);
1777 set_errno(addrlist, ERRNO_EXPANDFAIL, message, DEFER, FALSE, NULL);
1778 yield = DEFER;
1779 goto SEND_QUIT;
1780 }
1781 }
1782
1783 /* For SMTPS we need to wait for the initial OK response. */
1784 if (smtps)
1785 {
1786 if (!smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
1787 ob->command_timeout)) goto RESPONSE_FAILED;
1788 }
1789
1790 if (esmtp)
1791 greeting_cmd = "EHLO";
1792 else
1793 {
1794 greeting_cmd = "HELO";
1795 DEBUG(D_transport)
1796 debug_printf("not sending EHLO (host matches hosts_avoid_esmtp)\n");
1797 }
1798
1799 if (smtp_write_command(&outblock, FALSE, "%s %s\r\n",
1800 lmtp? "LHLO" : greeting_cmd, helo_data) < 0)
1801 goto SEND_FAILED;
1802 if (!smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
1803 ob->command_timeout))
1804 goto RESPONSE_FAILED;
1805 }
1806
1807 /* If the host is required to use a secure channel, ensure that we
1808 have one. */
1809
1810 else if (
1811 # ifdef EXPERIMENTAL_DANE
1812 dane ||
1813 # endif
1814 verify_check_given_host(&ob->hosts_require_tls, host) == OK
1815 )
1816 {
1817 save_errno = ERRNO_TLSREQUIRED;
1818 message = string_sprintf("a TLS session is required, but %s",
1819 tls_offered? "an attempt to start TLS failed" :
1820 "the server did not offer TLS support");
1821 goto TLS_FAILED;
1822 }
1823 #endif /*SUPPORT_TLS*/
1824
1825 /* If TLS is active, we have just started it up and re-done the EHLO command,
1826 so its response needs to be analyzed. If TLS is not active and this is a
1827 continued session down a previously-used socket, we haven't just done EHLO, so
1828 we skip this. */
1829
1830 if (continue_hostname == NULL
1831 #ifdef SUPPORT_TLS
1832 || tls_out.active >= 0
1833 #endif
1834 )
1835 {
1836 /* Set for IGNOREQUOTA if the response to LHLO specifies support and the
1837 lmtp_ignore_quota option was set. */
1838
1839 igquotstr = (lmtp && ob->lmtp_ignore_quota &&
1840 pcre_exec(regex_IGNOREQUOTA, NULL, CS buffer, Ustrlen(CS buffer), 0,
1841 PCRE_EOPT, NULL, 0) >= 0)? US" IGNOREQUOTA" : US"";
1842
1843 /* If the response to EHLO specified support for the SIZE parameter, note
1844 this, provided size_addition is non-negative. */
1845
1846 smtp_use_size = esmtp && ob->size_addition >= 0 &&
1847 pcre_exec(regex_SIZE, NULL, CS buffer, Ustrlen(CS buffer), 0,
1848 PCRE_EOPT, NULL, 0) >= 0;
1849
1850 /* Note whether the server supports PIPELINING. If hosts_avoid_esmtp matched
1851 the current host, esmtp will be false, so PIPELINING can never be used. If
1852 the current host matches hosts_avoid_pipelining, don't do it. */
1853
1854 smtp_use_pipelining = esmtp
1855 && verify_check_given_host(&ob->hosts_avoid_pipelining, host) != OK
1856 && pcre_exec(regex_PIPELINING, NULL, CS buffer, Ustrlen(CS buffer), 0,
1857 PCRE_EOPT, NULL, 0) >= 0;
1858
1859 DEBUG(D_transport) debug_printf("%susing PIPELINING\n",
1860 smtp_use_pipelining? "" : "not ");
1861
1862 #ifndef DISABLE_PRDR
1863 prdr_offered = esmtp
1864 && pcre_exec(regex_PRDR, NULL, CS buffer, Ustrlen(CS buffer), 0,
1865 PCRE_EOPT, NULL, 0) >= 0
1866 && verify_check_given_host(&ob->hosts_try_prdr, host) == OK;
1867
1868 if (prdr_offered)
1869 {DEBUG(D_transport) debug_printf("PRDR usable\n");}
1870 #endif
1871
1872 #ifdef EXPERIMENTAL_INTERNATIONAL
1873 if (addrlist->prop.utf8_msg)
1874 utf8_offered = esmtp
1875 && pcre_exec(regex_UTF8, NULL, CS buffer, Ustrlen(buffer), 0,
1876 PCRE_EOPT, NULL, 0) >= 0;
1877 #endif
1878
1879 /* Note if the server supports DSN */
1880 smtp_use_dsn = esmtp
1881 && pcre_exec(regex_DSN, NULL, CS buffer, Ustrlen(CS buffer), 0,
1882 PCRE_EOPT, NULL, 0) >= 0;
1883 DEBUG(D_transport) debug_printf("use_dsn=%d\n", smtp_use_dsn);
1884
1885 /* Note if the response to EHLO specifies support for the AUTH extension.
1886 If it has, check that this host is one we want to authenticate to, and do
1887 the business. The host name and address must be available when the
1888 authenticator's client driver is running. */
1889
1890 switch (yield = smtp_auth(buffer, sizeof(buffer), addrlist, host,
1891 ob, esmtp, &inblock, &outblock))
1892 {
1893 default: goto SEND_QUIT;
1894 case OK: break;
1895 case FAIL_SEND: goto SEND_FAILED;
1896 case FAIL: goto RESPONSE_FAILED;
1897 }
1898 }
1899
1900 /* The setting up of the SMTP call is now complete. Any subsequent errors are
1901 message-specific. */
1902
1903 setting_up = FALSE;
1904
1905 #ifdef EXPERIMENTAL_INTERNATIONAL
1906 /* If this is an international message we need the host to speak SMTPUTF8 */
1907 if (utf8_needed && !utf8_offered)
1908 {
1909 errno = ERRNO_UTF8_FWD;
1910 goto RESPONSE_FAILED;
1911 }
1912 #endif
1913
1914 /* If there is a filter command specified for this transport, we can now
1915 set it up. This cannot be done until the identify of the host is known. */
1916
1917 if (tblock->filter_command != NULL)
1918 {
1919 BOOL rc;
1920 uschar buffer[64];
1921 sprintf(CS buffer, "%.50s transport", tblock->name);
1922 rc = transport_set_up_command(&transport_filter_argv, tblock->filter_command,
1923 TRUE, DEFER, addrlist, buffer, NULL);
1924 transport_filter_timeout = tblock->filter_timeout;
1925
1926 /* On failure, copy the error to all addresses, abandon the SMTP call, and
1927 yield ERROR. */
1928
1929 if (!rc)
1930 {
1931 set_errno(addrlist->next, addrlist->basic_errno, addrlist->message, DEFER,
1932 FALSE, NULL);
1933 yield = ERROR;
1934 goto SEND_QUIT;
1935 }
1936 }
1937
1938
1939 /* For messages that have more than the maximum number of envelope recipients,
1940 we want to send several transactions down the same SMTP connection. (See
1941 comments in deliver.c as to how this reconciles, heuristically, with
1942 remote_max_parallel.) This optimization was added to Exim after the following
1943 code was already working. The simplest way to put it in without disturbing the
1944 code was to use a goto to jump back to this point when there is another
1945 transaction to handle. */
1946
1947 SEND_MESSAGE:
1948 sync_addr = first_addr;
1949 address_count = 0;
1950 ok = FALSE;
1951 send_rset = TRUE;
1952 completed_address = FALSE;
1953
1954
1955 /* Initiate a message transfer. If we know the receiving MTA supports the SIZE
1956 qualification, send it, adding something to the message size to allow for
1957 imprecision and things that get added en route. Exim keeps the number of lines
1958 in a message, so we can give an accurate value for the original message, but we
1959 need some additional to handle added headers. (Double "." characters don't get
1960 included in the count.) */
1961
1962 p = buffer;
1963 *p = 0;
1964
1965 if (smtp_use_size)
1966 {
1967 sprintf(CS p, " SIZE=%d", message_size+message_linecount+ob->size_addition);
1968 while (*p) p++;
1969 }
1970
1971 #ifndef DISABLE_PRDR
1972 prdr_active = FALSE;
1973 if (prdr_offered)
1974 {
1975 for (addr = first_addr; addr; addr = addr->next)
1976 if (addr->transport_return == PENDING_DEFER)
1977 {
1978 for (addr = addr->next; addr; addr = addr->next)
1979 if (addr->transport_return == PENDING_DEFER)
1980 { /* at least two recipients to send */
1981 prdr_active = TRUE;
1982 sprintf(CS p, " PRDR"); p += 5;
1983 break;
1984 }
1985 break;
1986 }
1987 }
1988 #endif
1989
1990 #ifdef EXPERIMENTAL_INTERNATIONAL
1991 if (addrlist->prop.utf8_msg && !addrlist->prop.utf8_downcvt && utf8_offered)
1992 sprintf(CS p, " SMTPUTF8"), p += 9;
1993 #endif
1994
1995 /* check if all addresses have lasthop flag */
1996 /* do not send RET and ENVID if true */
1997 for (dsn_all_lasthop = TRUE, addr = first_addr;
1998 address_count < max_rcpt && addr != NULL;
1999 addr = addr->next)
2000 if ((addr->dsn_flags & rf_dsnlasthop) != 1)
2001 {
2002 dsn_all_lasthop = FALSE;
2003 break;
2004 }
2005
2006 /* Add any DSN flags to the mail command */
2007
2008 if (smtp_use_dsn && !dsn_all_lasthop)
2009 {
2010 if (dsn_ret == dsn_ret_hdrs)
2011 {
2012 Ustrcpy(p, " RET=HDRS");
2013 while (*p) p++;
2014 }
2015 else if (dsn_ret == dsn_ret_full)
2016 {
2017 Ustrcpy(p, " RET=FULL");
2018 while (*p) p++;
2019 }
2020 if (dsn_envid != NULL)
2021 {
2022 string_format(p, sizeof(buffer) - (p-buffer), " ENVID=%s", dsn_envid);
2023 while (*p) p++;
2024 }
2025 }
2026
2027 /* If an authenticated_sender override has been specified for this transport
2028 instance, expand it. If the expansion is forced to fail, and there was already
2029 an authenticated_sender for this message, the original value will be used.
2030 Other expansion failures are serious. An empty result is ignored, but there is
2031 otherwise no check - this feature is expected to be used with LMTP and other
2032 cases where non-standard addresses (e.g. without domains) might be required. */
2033
2034 if (smtp_mail_auth_str(p, sizeof(buffer) - (p-buffer), addrlist, ob))
2035 {
2036 yield = ERROR;
2037 goto SEND_QUIT;
2038 }
2039
2040 /* From here until we send the DATA command, we can make use of PIPELINING
2041 if the server host supports it. The code has to be able to check the responses
2042 at any point, for when the buffer fills up, so we write it totally generally.
2043 When PIPELINING is off, each command written reports that it has flushed the
2044 buffer. */
2045
2046 pending_MAIL = TRUE; /* The block starts with MAIL */
2047
2048 {
2049 uschar * s = return_path;
2050 #ifdef EXPERIMENTAL_INTERNATIONAL
2051 uschar * errstr = NULL;
2052
2053 /* If we must downconvert, do the from-address here. Remember we had to
2054 for the to-addresses (done below), and also (ugly) for re-doing when building
2055 the delivery log line. */
2056
2057 if (addrlist->prop.utf8_msg && (addrlist->prop.utf8_downcvt || !utf8_offered))
2058 {
2059 if (s = string_address_utf8_to_alabel(return_path, &errstr), errstr)
2060 {
2061 set_errno(addrlist, ERRNO_EXPANDFAIL, errstr, DEFER, FALSE, NULL);
2062 yield = ERROR;
2063 goto SEND_QUIT;
2064 }
2065 setflag(addrlist, af_utf8_downcvt);
2066 }
2067 #endif
2068
2069 rc = smtp_write_command(&outblock, smtp_use_pipelining,
2070 "MAIL FROM:<%s>%s\r\n", s, buffer);
2071 }
2072
2073 mail_command = string_copy(big_buffer); /* Save for later error message */
2074
2075 switch(rc)
2076 {
2077 case -1: /* Transmission error */
2078 goto SEND_FAILED;
2079
2080 case +1: /* Block was sent */
2081 if (!smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
2082 ob->command_timeout))
2083 {
2084 if (errno == 0 && buffer[0] == '4')
2085 {
2086 errno = ERRNO_MAIL4XX;
2087 addrlist->more_errno |= ((buffer[1] - '0')*10 + buffer[2] - '0') << 8;
2088 }
2089 goto RESPONSE_FAILED;
2090 }
2091 pending_MAIL = FALSE;
2092 break;
2093 }
2094
2095 /* Pass over all the relevant recipient addresses for this host, which are the
2096 ones that have status PENDING_DEFER. If we are using PIPELINING, we can send
2097 several before we have to read the responses for those seen so far. This
2098 checking is done by a subroutine because it also needs to be done at the end.
2099 Send only up to max_rcpt addresses at a time, leaving first_addr pointing to
2100 the next one if not all are sent.
2101
2102 In the MUA wrapper situation, we want to flush the PIPELINING buffer for the
2103 last address because we want to abort if any recipients have any kind of
2104 problem, temporary or permanent. We know that all recipient addresses will have
2105 the PENDING_DEFER status, because only one attempt is ever made, and we know
2106 that max_rcpt will be large, so all addresses will be done at once. */
2107
2108 for (addr = first_addr;
2109 address_count < max_rcpt && addr != NULL;
2110 addr = addr->next)
2111 {
2112 int count;
2113 BOOL no_flush;
2114 uschar * rcpt_addr;
2115
2116 addr->dsn_aware = smtp_use_dsn ? dsn_support_yes : dsn_support_no;
2117
2118 if (addr->transport_return != PENDING_DEFER) continue;
2119
2120 address_count++;
2121 no_flush = smtp_use_pipelining && (!mua_wrapper || addr->next != NULL);
2122
2123 /* Add any DSN flags to the rcpt command and add to the sent string */
2124
2125 p = buffer;
2126 *p = 0;
2127
2128 if (smtp_use_dsn && (addr->dsn_flags & rf_dsnlasthop) != 1)
2129 {
2130 if ((addr->dsn_flags & rf_dsnflags) != 0)
2131 {
2132 int i;
2133 BOOL first = TRUE;
2134 Ustrcpy(p, " NOTIFY=");
2135 while (*p) p++;
2136 for (i = 0; i < 4; i++)
2137 if ((addr->dsn_flags & rf_list[i]) != 0)
2138 {
2139 if (!first) *p++ = ',';
2140 first = FALSE;
2141 Ustrcpy(p, rf_names[i]);
2142 while (*p) p++;
2143 }
2144 }
2145
2146 if (addr->dsn_orcpt != NULL)
2147 {
2148 string_format(p, sizeof(buffer) - (p-buffer), " ORCPT=%s",
2149 addr->dsn_orcpt);
2150 while (*p) p++;
2151 }
2152 }
2153
2154 /* Now send the RCPT command, and process outstanding responses when
2155 necessary. After a timeout on RCPT, we just end the function, leaving the
2156 yield as OK, because this error can often mean that there is a problem with
2157 just one address, so we don't want to delay the host. */
2158
2159 rcpt_addr = transport_rcpt_address(addr, tblock->rcpt_include_affixes);
2160
2161 #ifdef EXPERIMENTAL_INTERNATIONAL
2162 {
2163 uschar * dummy_errstr;
2164 if ( testflag(addrlist, af_utf8_downcvt)
2165 && (rcpt_addr = string_address_utf8_to_alabel(rcpt_addr, &dummy_errstr),
2166 dummy_errstr
2167 ) )
2168 {
2169 errno = ERRNO_EXPANDFAIL;
2170 goto SEND_FAILED;
2171 }
2172 }
2173 #endif
2174
2175 count = smtp_write_command(&outblock, no_flush, "RCPT TO:<%s>%s%s\r\n",
2176 rcpt_addr, igquotstr, buffer);
2177
2178 if (count < 0) goto SEND_FAILED;
2179 if (count > 0)
2180 {
2181 switch(sync_responses(first_addr, tblock->rcpt_include_affixes,
2182 &sync_addr, host, count, ob->address_retry_include_sender,
2183 pending_MAIL, 0, &inblock, ob->command_timeout, buffer,
2184 sizeof(buffer)))
2185 {
2186 case 3: ok = TRUE; /* 2xx & 5xx => OK & progress made */
2187 case 2: completed_address = TRUE; /* 5xx (only) => progress made */
2188 break;
2189
2190 case 1: ok = TRUE; /* 2xx (only) => OK, but if LMTP, */
2191 if (!lmtp) completed_address = TRUE; /* can't tell about progress yet */
2192 case 0: /* No 2xx or 5xx, but no probs */
2193 break;
2194
2195 case -1: goto END_OFF; /* Timeout on RCPT */
2196 default: goto RESPONSE_FAILED; /* I/O error, or any MAIL error */
2197 }
2198 pending_MAIL = FALSE; /* Dealt with MAIL */
2199 }
2200 } /* Loop for next address */
2201
2202 /* If we are an MUA wrapper, abort if any RCPTs were rejected, either
2203 permanently or temporarily. We should have flushed and synced after the last
2204 RCPT. */
2205
2206 if (mua_wrapper)
2207 {
2208 address_item *badaddr;
2209 for (badaddr = first_addr; badaddr; badaddr = badaddr->next)
2210 if (badaddr->transport_return != PENDING_OK)
2211 {
2212 /*XXX could we find a better errno than 0 here? */
2213 set_errno(addrlist, 0, badaddr->message, FAIL,
2214 testflag(badaddr, af_pass_message), NULL);
2215 ok = FALSE;
2216 break;
2217 }
2218 }
2219
2220 /* If ok is TRUE, we know we have got at least one good recipient, and must now
2221 send DATA, but if it is FALSE (in the normal, non-wrapper case), we may still
2222 have a good recipient buffered up if we are pipelining. We don't want to waste
2223 time sending DATA needlessly, so we only send it if either ok is TRUE or if we
2224 are pipelining. The responses are all handled by sync_responses(). */
2225
2226 if (ok || (smtp_use_pipelining && !mua_wrapper))
2227 {
2228 int count = smtp_write_command(&outblock, FALSE, "DATA\r\n");
2229 if (count < 0) goto SEND_FAILED;
2230 switch(sync_responses(first_addr, tblock->rcpt_include_affixes, &sync_addr,
2231 host, count, ob->address_retry_include_sender, pending_MAIL,
2232 ok? +1 : -1, &inblock, ob->command_timeout, buffer, sizeof(buffer)))
2233 {
2234 case 3: ok = TRUE; /* 2xx & 5xx => OK & progress made */
2235 case 2: completed_address = TRUE; /* 5xx (only) => progress made */
2236 break;
2237
2238 case 1: ok = TRUE; /* 2xx (only) => OK, but if LMTP, */
2239 if (!lmtp) completed_address = TRUE; /* can't tell about progress yet */
2240 case 0: break; /* No 2xx or 5xx, but no probs */
2241
2242 case -1: goto END_OFF; /* Timeout on RCPT */
2243 default: goto RESPONSE_FAILED; /* I/O error, or any MAIL/DATA error */
2244 }
2245 }
2246
2247 /* Save the first address of the next batch. */
2248
2249 first_addr = addr;
2250
2251 /* If there were no good recipients (but otherwise there have been no
2252 problems), just set ok TRUE, since we have handled address-specific errors
2253 already. Otherwise, it's OK to send the message. Use the check/escape mechanism
2254 for handling the SMTP dot-handling protocol, flagging to apply to headers as
2255 well as body. Set the appropriate timeout value to be used for each chunk.
2256 (Haven't been able to make it work using select() for writing yet.) */
2257
2258 if (!ok) ok = TRUE; else
2259 {
2260 sigalrm_seen = FALSE;
2261 transport_write_timeout = ob->data_timeout;
2262 smtp_command = US"sending data block"; /* For error messages */
2263 DEBUG(D_transport|D_v)
2264 debug_printf(" SMTP>> writing message and terminating \".\"\n");
2265 transport_count = 0;
2266
2267 #ifndef DISABLE_DKIM
2268 ok = dkim_transport_write_message(addrlist, inblock.sock,
2269 topt_use_crlf | topt_end_dot | topt_escape_headers |
2270 (tblock->body_only? topt_no_headers : 0) |
2271 (tblock->headers_only? topt_no_body : 0) |
2272 (tblock->return_path_add? topt_add_return_path : 0) |
2273 (tblock->delivery_date_add? topt_add_delivery_date : 0) |
2274 (tblock->envelope_to_add? topt_add_envelope_to : 0),
2275 0, /* No size limit */
2276 tblock->add_headers, tblock->remove_headers,
2277 US".", US"..", /* Escaping strings */
2278 tblock->rewrite_rules, tblock->rewrite_existflags,
2279 ob->dkim_private_key, ob->dkim_domain, ob->dkim_selector,
2280 ob->dkim_canon, ob->dkim_strict, ob->dkim_sign_headers
2281 );
2282 #else
2283 ok = transport_write_message(addrlist, inblock.sock,
2284 topt_use_crlf | topt_end_dot | topt_escape_headers |
2285 (tblock->body_only? topt_no_headers : 0) |
2286 (tblock->headers_only? topt_no_body : 0) |
2287 (tblock->return_path_add? topt_add_return_path : 0) |
2288 (tblock->delivery_date_add? topt_add_delivery_date : 0) |
2289 (tblock->envelope_to_add? topt_add_envelope_to : 0),
2290 0, /* No size limit */
2291 tblock->add_headers, tblock->remove_headers,
2292 US".", US"..", /* Escaping strings */
2293 tblock->rewrite_rules, tblock->rewrite_existflags);
2294 #endif
2295
2296 /* transport_write_message() uses write() because it is called from other
2297 places to write to non-sockets. This means that under some OS (e.g. Solaris)
2298 it can exit with "Broken pipe" as its error. This really means that the
2299 socket got closed at the far end. */
2300
2301 transport_write_timeout = 0; /* for subsequent transports */
2302
2303 /* Failure can either be some kind of I/O disaster (including timeout),
2304 or the failure of a transport filter or the expansion of added headers. */
2305
2306 if (!ok)
2307 {
2308 buffer[0] = 0; /* There hasn't been a response */
2309 goto RESPONSE_FAILED;
2310 }
2311
2312 /* We used to send the terminating "." explicitly here, but because of
2313 buffering effects at both ends of TCP/IP connections, you don't gain
2314 anything by keeping it separate, so it might as well go in the final
2315 data buffer for efficiency. This is now done by setting the topt_end_dot
2316 flag above. */
2317
2318 smtp_command = US"end of data";
2319
2320 #ifndef DISABLE_PRDR
2321 /* For PRDR we optionally get a partial-responses warning
2322 * followed by the individual responses, before going on with
2323 * the overall response. If we don't get the warning then deal
2324 * with per non-PRDR. */
2325 if(prdr_active)
2326 {
2327 ok = smtp_read_response(&inblock, buffer, sizeof(buffer), '3',
2328 ob->final_timeout);
2329 if (!ok && errno == 0)
2330 switch(buffer[0])
2331 {
2332 case '2': prdr_active = FALSE;
2333 ok = TRUE;
2334 break;
2335 case '4': errno = ERRNO_DATA4XX;
2336 addrlist->more_errno |= ((buffer[1] - '0')*10 + buffer[2] - '0') << 8;
2337 break;
2338 }
2339 }
2340 else
2341 #endif
2342
2343 /* For non-PRDR SMTP, we now read a single response that applies to the
2344 whole message. If it is OK, then all the addresses have been delivered. */
2345
2346 if (!lmtp)
2347 {
2348 ok = smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
2349 ob->final_timeout);
2350 if (!ok && errno == 0 && buffer[0] == '4')
2351 {
2352 errno = ERRNO_DATA4XX;
2353 addrlist->more_errno |= ((buffer[1] - '0')*10 + buffer[2] - '0') << 8;
2354 }
2355 }
2356
2357 /* For LMTP, we get back a response for every RCPT command that we sent;
2358 some may be accepted and some rejected. For those that get a response, their
2359 status is fixed; any that are accepted have been handed over, even if later
2360 responses crash - at least, that's how I read RFC 2033.
2361
2362 If all went well, mark the recipient addresses as completed, record which
2363 host/IPaddress they were delivered to, and cut out RSET when sending another
2364 message down the same channel. Write the completed addresses to the journal
2365 now so that they are recorded in case there is a crash of hardware or
2366 software before the spool gets updated. Also record the final SMTP
2367 confirmation if needed (for SMTP only). */
2368
2369 if (ok)
2370 {
2371 int flag = '=';
2372 int delivery_time = (int)(time(NULL) - start_delivery_time);
2373 int len;
2374 uschar *conf = NULL;
2375 send_rset = FALSE;
2376
2377 /* Set up confirmation if needed - applies only to SMTP */
2378
2379 if (
2380 #ifndef EXPERIMENTAL_EVENT
2381 (log_extra_selector & LX_smtp_confirmation) != 0 &&
2382 #endif
2383 !lmtp
2384 )
2385 {
2386 const uschar *s = string_printing(buffer);
2387 /* deconst cast ok here as string_printing was checked to have alloc'n'copied */
2388 conf = (s == buffer)? (uschar *)string_copy(s) : US s;
2389 }
2390
2391 /* Process all transported addresses - for LMTP or PRDR, read a status for
2392 each one. */
2393
2394 for (addr = addrlist; addr != first_addr; addr = addr->next)
2395 {
2396 if (addr->transport_return != PENDING_OK) continue;
2397
2398 /* LMTP - if the response fails badly (e.g. timeout), use it for all the
2399 remaining addresses. Otherwise, it's a return code for just the one
2400 address. For temporary errors, add a retry item for the address so that
2401 it doesn't get tried again too soon. */
2402
2403 #ifndef DISABLE_PRDR
2404 if (lmtp || prdr_active)
2405 #else
2406 if (lmtp)
2407 #endif
2408 {
2409 if (!smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
2410 ob->final_timeout))
2411 {
2412 if (errno != 0 || buffer[0] == 0) goto RESPONSE_FAILED;
2413 addr->message = string_sprintf(
2414 #ifndef DISABLE_PRDR
2415 "%s error after %s: %s", prdr_active ? "PRDR":"LMTP",
2416 #else
2417 "LMTP error after %s: %s",
2418 #endif
2419 big_buffer, string_printing(buffer));
2420 setflag(addr, af_pass_message); /* Allow message to go to user */
2421 if (buffer[0] == '5')
2422 addr->transport_return = FAIL;
2423 else
2424 {
2425 errno = ERRNO_DATA4XX;
2426 addr->more_errno |= ((buffer[1] - '0')*10 + buffer[2] - '0') << 8;
2427 addr->transport_return = DEFER;
2428 #ifndef DISABLE_PRDR
2429 if (!prdr_active)
2430 #endif
2431 retry_add_item(addr, addr->address_retry_key, 0);
2432 }
2433 continue;
2434 }
2435 completed_address = TRUE; /* NOW we can set this flag */
2436 if ((log_extra_selector & LX_smtp_confirmation) != 0)
2437 {
2438 const uschar *s = string_printing(buffer);
2439 /* deconst cast ok here as string_printing was checked to have alloc'n'copied */
2440 conf = (s == buffer)? (uschar *)string_copy(s) : US s;
2441 }
2442 }
2443
2444 /* SMTP, or success return from LMTP for this address. Pass back the
2445 actual host that was used. */
2446
2447 addr->transport_return = OK;
2448 addr->more_errno = delivery_time;
2449 addr->host_used = host;
2450 addr->special_action = flag;
2451 addr->message = conf;
2452 #ifndef DISABLE_PRDR
2453 if (prdr_active) addr->flags |= af_prdr_used;
2454 #endif
2455 flag = '-';
2456
2457 #ifndef DISABLE_PRDR
2458 if (!prdr_active)
2459 #endif
2460 {
2461 /* Update the journal. For homonymic addresses, use the base address plus
2462 the transport name. See lots of comments in deliver.c about the reasons
2463 for the complications when homonyms are involved. Just carry on after
2464 write error, as it may prove possible to update the spool file later. */
2465
2466 if (testflag(addr, af_homonym))
2467 sprintf(CS buffer, "%.500s/%s\n", addr->unique + 3, tblock->name);
2468 else
2469 sprintf(CS buffer, "%.500s\n", addr->unique);
2470
2471 DEBUG(D_deliver) debug_printf("journalling %s", buffer);
2472 len = Ustrlen(CS buffer);
2473 if (write(journal_fd, buffer, len) != len)
2474 log_write(0, LOG_MAIN|LOG_PANIC, "failed to write journal for "
2475 "%s: %s", buffer, strerror(errno));
2476 }
2477 }
2478
2479 #ifndef DISABLE_PRDR
2480 if (prdr_active)
2481 {
2482 /* PRDR - get the final, overall response. For any non-success
2483 upgrade all the address statuses. */
2484 ok = smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
2485 ob->final_timeout);
2486 if (!ok)
2487 {
2488 if(errno == 0 && buffer[0] == '4')
2489 {
2490 errno = ERRNO_DATA4XX;
2491 addrlist->more_errno |= ((buffer[1] - '0')*10 + buffer[2] - '0') << 8;
2492 }
2493 for (addr = addrlist; addr != first_addr; addr = addr->next)
2494 if (buffer[0] == '5' || addr->transport_return == OK)
2495 addr->transport_return = PENDING_OK; /* allow set_errno action */
2496 goto RESPONSE_FAILED;
2497 }
2498
2499 /* Update the journal, or setup retry. */
2500 for (addr = addrlist; addr != first_addr; addr = addr->next)
2501 if (addr->transport_return == OK)
2502 {
2503 if (testflag(addr, af_homonym))
2504 sprintf(CS buffer, "%.500s/%s\n", addr->unique + 3, tblock->name);
2505 else
2506 sprintf(CS buffer, "%.500s\n", addr->unique);
2507
2508 DEBUG(D_deliver) debug_printf("journalling(PRDR) %s", buffer);
2509 len = Ustrlen(CS buffer);
2510 if (write(journal_fd, buffer, len) != len)
2511 log_write(0, LOG_MAIN|LOG_PANIC, "failed to write journal for "
2512 "%s: %s", buffer, strerror(errno));
2513 }
2514 else if (addr->transport_return == DEFER)
2515 retry_add_item(addr, addr->address_retry_key, -2);
2516 }
2517 #endif
2518
2519 /* Ensure the journal file is pushed out to disk. */
2520
2521 if (EXIMfsync(journal_fd) < 0)
2522 log_write(0, LOG_MAIN|LOG_PANIC, "failed to fsync journal: %s",
2523 strerror(errno));
2524 }
2525 }
2526
2527
2528 /* Handle general (not specific to one address) failures here. The value of ok
2529 is used to skip over this code on the falling through case. A timeout causes a
2530 deferral. Other errors may defer or fail according to the response code, and
2531 may set up a special errno value, e.g. after connection chopped, which is
2532 assumed if errno == 0 and there is no text in the buffer. If control reaches
2533 here during the setting up phase (i.e. before MAIL FROM) then always defer, as
2534 the problem is not related to this specific message. */
2535
2536 if (!ok)
2537 {
2538 int code;
2539
2540 RESPONSE_FAILED:
2541 save_errno = errno;
2542 message = NULL;
2543 send_quit = check_response(host, &save_errno, addrlist->more_errno,
2544 buffer, &code, &message, &pass_message);
2545 goto FAILED;
2546
2547 SEND_FAILED:
2548 save_errno = errno;
2549 code = '4';
2550 message = US string_sprintf("send() to %s [%s] failed: %s",
2551 host->name, host->address, strerror(save_errno));
2552 send_quit = FALSE;
2553 goto FAILED;
2554
2555 /* This label is jumped to directly when a TLS negotiation has failed,
2556 or was not done for a host for which it is required. Values will be set
2557 in message and save_errno, and setting_up will always be true. Treat as
2558 a temporary error. */
2559
2560 #ifdef SUPPORT_TLS
2561 TLS_FAILED:
2562 code = '4';
2563 #endif
2564
2565 /* If the failure happened while setting up the call, see if the failure was
2566 a 5xx response (this will either be on connection, or following HELO - a 5xx
2567 after EHLO causes it to try HELO). If so, fail all addresses, as this host is
2568 never going to accept them. For other errors during setting up (timeouts or
2569 whatever), defer all addresses, and yield DEFER, so that the host is not
2570 tried again for a while. */
2571
2572 FAILED:
2573 ok = FALSE; /* For when reached by GOTO */
2574
2575 if (setting_up)
2576 {
2577 if (code == '5')
2578 set_errno(addrlist, save_errno, message, FAIL, pass_message, host);
2579 else
2580 {
2581 set_errno(addrlist, save_errno, message, DEFER, pass_message, host);
2582 yield = DEFER;
2583 }
2584 }
2585
2586 /* We want to handle timeouts after MAIL or "." and loss of connection after
2587 "." specially. They can indicate a problem with the sender address or with
2588 the contents of the message rather than a real error on the connection. These
2589 cases are treated in the same way as a 4xx response. This next bit of code
2590 does the classification. */
2591
2592 else
2593 {
2594 BOOL message_error;
2595
2596 switch(save_errno)
2597 {
2598 #ifdef EXPERIMENTAL_INTERNATIONAL
2599 case ERRNO_UTF8_FWD:
2600 code = '5';
2601 /*FALLTHROUGH*/
2602 #endif
2603 case 0:
2604 case ERRNO_MAIL4XX:
2605 case ERRNO_DATA4XX:
2606 message_error = TRUE;
2607 break;
2608
2609 case ETIMEDOUT:
2610 message_error = Ustrncmp(smtp_command,"MAIL",4) == 0 ||
2611 Ustrncmp(smtp_command,"end ",4) == 0;
2612 break;
2613
2614 case ERRNO_SMTPCLOSED:
2615 message_error = Ustrncmp(smtp_command,"end ",4) == 0;
2616 break;
2617
2618 default:
2619 message_error = FALSE;
2620 break;
2621 }
2622
2623 /* Handle the cases that are treated as message errors. These are:
2624
2625 (a) negative response or timeout after MAIL
2626 (b) negative response after DATA
2627 (c) negative response or timeout or dropped connection after "."
2628 (d) utf8 support required and not offered
2629
2630 It won't be a negative response or timeout after RCPT, as that is dealt
2631 with separately above. The action in all cases is to set an appropriate
2632 error code for all the addresses, but to leave yield set to OK because the
2633 host itself has not failed. Of course, it might in practice have failed
2634 when we've had a timeout, but if so, we'll discover that at the next
2635 delivery attempt. For a temporary error, set the message_defer flag, and
2636 write to the logs for information if this is not the last host. The error
2637 for the last host will be logged as part of the address's log line. */
2638
2639 if (message_error)
2640 {
2641 if (mua_wrapper) code = '5'; /* Force hard failure in wrapper mode */
2642 set_errno(addrlist, save_errno, message, (code == '5')? FAIL : DEFER,
2643 pass_message, host);
2644
2645 /* If there's an errno, the message contains just the identity of
2646 the host. */
2647
2648 if (code != '5') /* Anything other than 5 is treated as temporary */
2649 {
2650 if (save_errno > 0)
2651 message = US string_sprintf("%s: %s", message, strerror(save_errno));
2652 if (host->next != NULL) log_write(0, LOG_MAIN, "%s", message);
2653 msglog_line(host, message);
2654 *message_defer = TRUE;
2655 }
2656 }
2657
2658 /* Otherwise, we have an I/O error or a timeout other than after MAIL or
2659 ".", or some other transportation error. We defer all addresses and yield
2660 DEFER, except for the case of failed add_headers expansion, or a transport
2661 filter failure, when the yield should be ERROR, to stop it trying other
2662 hosts. */
2663
2664 else
2665 {
2666 yield = (save_errno == ERRNO_CHHEADER_FAIL ||
2667 save_errno == ERRNO_FILTER_FAIL)? ERROR : DEFER;
2668 set_errno(addrlist, save_errno, message, DEFER, pass_message, host);
2669 }
2670 }
2671 }
2672
2673
2674 /* If all has gone well, send_quit will be set TRUE, implying we can end the
2675 SMTP session tidily. However, if there were too many addresses to send in one
2676 message (indicated by first_addr being non-NULL) we want to carry on with the
2677 rest of them. Also, it is desirable to send more than one message down the SMTP
2678 connection if there are several waiting, provided we haven't already sent so
2679 many as to hit the configured limit. The function transport_check_waiting looks
2680 for a waiting message and returns its id. Then transport_pass_socket tries to
2681 set up a continued delivery by passing the socket on to another process. The
2682 variable send_rset is FALSE if a message has just been successfully transfered.
2683
2684 If we are already sending down a continued channel, there may be further
2685 addresses not yet delivered that are aimed at the same host, but which have not
2686 been passed in this run of the transport. In this case, continue_more will be
2687 true, and all we should do is send RSET if necessary, and return, leaving the
2688 channel open.
2689
2690 However, if no address was disposed of, i.e. all addresses got 4xx errors, we
2691 do not want to continue with other messages down the same channel, because that
2692 can lead to looping between two or more messages, all with the same,
2693 temporarily failing address(es). [The retry information isn't updated yet, so
2694 new processes keep on trying.] We probably also don't want to try more of this
2695 message's addresses either.
2696
2697 If we have started a TLS session, we have to end it before passing the
2698 connection to a new process. However, not all servers can handle this (Exim
2699 can), so we do not pass such a connection on if the host matches
2700 hosts_nopass_tls. */
2701
2702 DEBUG(D_transport)
2703 debug_printf("ok=%d send_quit=%d send_rset=%d continue_more=%d "
2704 "yield=%d first_address is %sNULL\n", ok, send_quit, send_rset,
2705 continue_more, yield, (first_addr == NULL)? "":"not ");
2706
2707 if (completed_address && ok && send_quit)
2708 {
2709 BOOL more;
2710 smtp_compare_t t_compare;
2711
2712 t_compare.tblock = tblock;
2713 t_compare.current_sender_address = sender_address;
2714
2715 if ( first_addr != NULL
2716 || continue_more
2717 || ( ( tls_out.active < 0
2718 || verify_check_given_host(&ob->hosts_nopass_tls, host) != OK
2719 )
2720 &&
2721 transport_check_waiting(tblock->name, host->name,
2722 tblock->connection_max_messages, new_message_id, &more,
2723 (oicf)smtp_are_same_identities, (void*)&t_compare)
2724 ) )
2725 {
2726 uschar *msg;
2727 BOOL pass_message;
2728
2729 if (send_rset)
2730 {
2731 if (! (ok = smtp_write_command(&outblock, FALSE, "RSET\r\n") >= 0))
2732 {
2733 msg = US string_sprintf("send() to %s [%s] failed: %s", host->name,
2734 host->address, strerror(save_errno));
2735 send_quit = FALSE;
2736 }
2737 else if (! (ok = smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
2738 ob->command_timeout)))
2739 {
2740 int code;
2741 send_quit = check_response(host, &errno, 0, buffer, &code, &msg,
2742 &pass_message);
2743 if (!send_quit)
2744 {
2745 DEBUG(D_transport) debug_printf("H=%s [%s] %s\n",
2746 host->name, host->address, msg);
2747 }
2748 }
2749 }
2750
2751 /* Either RSET was not needed, or it succeeded */
2752
2753 if (ok)
2754 {
2755 if (first_addr != NULL) /* More addresses still to be sent */
2756 { /* in this run of the transport */
2757 continue_sequence++; /* Causes * in logging */
2758 goto SEND_MESSAGE;
2759 }
2760 if (continue_more) return yield; /* More addresses for another run */
2761
2762 /* Pass the socket to a new Exim process. Before doing so, we must shut
2763 down TLS. Not all MTAs allow for the continuation of the SMTP session
2764 when TLS is shut down. We test for this by sending a new EHLO. If we
2765 don't get a good response, we don't attempt to pass the socket on. */
2766
2767 #ifdef SUPPORT_TLS
2768 if (tls_out.active >= 0)
2769 {
2770 tls_close(FALSE, TRUE);
2771 if (smtps)
2772 ok = FALSE;
2773 else
2774 ok = smtp_write_command(&outblock,FALSE,"EHLO %s\r\n",helo_data) >= 0 &&
2775 smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
2776 ob->command_timeout);
2777 }
2778 #endif
2779
2780 /* If the socket is successfully passed, we musn't send QUIT (or
2781 indeed anything!) from here. */
2782
2783 if (ok && transport_pass_socket(tblock->name, host->name, host->address,
2784 new_message_id, inblock.sock))
2785 {
2786 send_quit = FALSE;
2787 }
2788 }
2789
2790 /* If RSET failed and there are addresses left, they get deferred. */
2791
2792 else set_errno(first_addr, errno, msg, DEFER, FALSE, host);
2793 }
2794 }
2795
2796 /* End off tidily with QUIT unless the connection has died or the socket has
2797 been passed to another process. There has been discussion on the net about what
2798 to do after sending QUIT. The wording of the RFC suggests that it is necessary
2799 to wait for a response, but on the other hand, there isn't anything one can do
2800 with an error response, other than log it. Exim used to do that. However,
2801 further discussion suggested that it is positively advantageous not to wait for
2802 the response, but to close the session immediately. This is supposed to move
2803 the TCP/IP TIME_WAIT state from the server to the client, thereby removing some
2804 load from the server. (Hosts that are both servers and clients may not see much
2805 difference, of course.) Further discussion indicated that this was safe to do
2806 on Unix systems which have decent implementations of TCP/IP that leave the
2807 connection around for a while (TIME_WAIT) after the application has gone away.
2808 This enables the response sent by the server to be properly ACKed rather than
2809 timed out, as can happen on broken TCP/IP implementations on other OS.
2810
2811 This change is being made on 31-Jul-98. After over a year of trouble-free
2812 operation, the old commented-out code was removed on 17-Sep-99. */
2813
2814 SEND_QUIT:
2815 if (send_quit) (void)smtp_write_command(&outblock, FALSE, "QUIT\r\n");
2816
2817 END_OFF:
2818
2819 #ifdef SUPPORT_TLS
2820 tls_close(FALSE, TRUE);
2821 #endif
2822
2823 /* Close the socket, and return the appropriate value, first setting
2824 works because the NULL setting is passed back to the calling process, and
2825 remote_max_parallel is forced to 1 when delivering over an existing connection,
2826
2827 If all went well and continue_more is set, we shouldn't actually get here if
2828 there are further addresses, as the return above will be taken. However,
2829 writing RSET might have failed, or there may be other addresses whose hosts are
2830 specified in the transports, and therefore not visible at top level, in which
2831 case continue_more won't get set. */
2832
2833 (void)close(inblock.sock);
2834
2835 #ifdef EXPERIMENTAL_EVENT
2836 (void) event_raise(tblock->event_action, US"tcp:close", NULL);
2837 #endif
2838
2839 continue_transport = NULL;
2840 continue_hostname = NULL;
2841 return yield;
2842 }
2843
2844
2845
2846
2847 /*************************************************
2848 * Closedown entry point *
2849 *************************************************/
2850
2851 /* This function is called when exim is passed an open smtp channel
2852 from another incarnation, but the message which it has been asked
2853 to deliver no longer exists. The channel is on stdin.
2854
2855 We might do fancy things like looking for another message to send down
2856 the channel, but if the one we sought has gone, it has probably been
2857 delivered by some other process that itself will seek further messages,
2858 so just close down our connection.
2859
2860 Argument: pointer to the transport instance block
2861 Returns: nothing
2862 */
2863
2864 void
2865 smtp_transport_closedown(transport_instance *tblock)
2866 {
2867 smtp_transport_options_block *ob =
2868 (smtp_transport_options_block *)(tblock->options_block);
2869 smtp_inblock inblock;
2870 smtp_outblock outblock;
2871 uschar buffer[256];
2872 uschar inbuffer[4096];
2873 uschar outbuffer[16];
2874
2875 inblock.sock = fileno(stdin);
2876 inblock.buffer = inbuffer;
2877 inblock.buffersize = sizeof(inbuffer);
2878 inblock.ptr = inbuffer;
2879 inblock.ptrend = inbuffer;
2880
2881 outblock.sock = inblock.sock;
2882 outblock.buffersize = sizeof(outbuffer);
2883 outblock.buffer = outbuffer;
2884 outblock.ptr = outbuffer;
2885 outblock.cmd_count = 0;
2886 outblock.authenticating = FALSE;
2887
2888 (void)smtp_write_command(&outblock, FALSE, "QUIT\r\n");
2889 (void)smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
2890 ob->command_timeout);
2891 (void)close(inblock.sock);
2892 }
2893
2894
2895
2896 /*************************************************
2897 * Prepare addresses for delivery *
2898 *************************************************/
2899
2900 /* This function is called to flush out error settings from previous delivery
2901 attempts to other hosts. It also records whether we got here via an MX record
2902 or not in the more_errno field of the address. We are interested only in
2903 addresses that are still marked DEFER - others may have got delivered to a
2904 previously considered IP address. Set their status to PENDING_DEFER to indicate
2905 which ones are relevant this time.
2906
2907 Arguments:
2908 addrlist the list of addresses
2909 host the host we are delivering to
2910
2911 Returns: the first address for this delivery
2912 */
2913
2914 static address_item *
2915 prepare_addresses(address_item *addrlist, host_item *host)
2916 {
2917 address_item *first_addr = NULL;
2918 address_item *addr;
2919 for (addr = addrlist; addr != NULL; addr = addr->next)
2920 if (addr->transport_return == DEFER)
2921 {
2922 if (first_addr == NULL) first_addr = addr;
2923 addr->transport_return = PENDING_DEFER;
2924 addr->basic_errno = 0;
2925 addr->more_errno = (host->mx >= 0)? 'M' : 'A';
2926 addr->message = NULL;
2927 #ifdef SUPPORT_TLS
2928 addr->cipher = NULL;
2929 addr->ourcert = NULL;
2930 addr->peercert = NULL;
2931 addr->peerdn = NULL;
2932 addr->ocsp = OCSP_NOT_REQ;
2933 #endif
2934 }
2935 return first_addr;
2936 }
2937
2938
2939
2940 /*************************************************
2941 * Main entry point *
2942 *************************************************/
2943
2944 /* See local README for interface details. As this is a remote transport, it is
2945 given a chain of addresses to be delivered in one connection, if possible. It
2946 always returns TRUE, indicating that each address has its own independent
2947 status set, except if there is a setting up problem, in which case it returns
2948 FALSE. */
2949
2950 BOOL
2951 smtp_transport_entry(
2952 transport_instance *tblock, /* data for this instantiation */
2953 address_item *addrlist) /* addresses we are working on */
2954 {
2955 int cutoff_retry;
2956 int port;
2957 int hosts_defer = 0;
2958 int hosts_fail = 0;
2959 int hosts_looked_up = 0;
2960 int hosts_retry = 0;
2961 int hosts_serial = 0;
2962 int hosts_total = 0;
2963 int total_hosts_tried = 0;
2964 address_item *addr;
2965 BOOL expired = TRUE;
2966 BOOL continuing = continue_hostname != NULL;
2967 uschar *expanded_hosts = NULL;
2968 uschar *pistring;
2969 uschar *tid = string_sprintf("%s transport", tblock->name);
2970 smtp_transport_options_block *ob =
2971 (smtp_transport_options_block *)(tblock->options_block);
2972 host_item *hostlist = addrlist->host_list;
2973 host_item *host = NULL;
2974
2975 DEBUG(D_transport)
2976 {
2977 debug_printf("%s transport entered\n", tblock->name);
2978 for (addr = addrlist; addr != NULL; addr = addr->next)
2979 debug_printf(" %s\n", addr->address);
2980 if (continuing) debug_printf("already connected to %s [%s]\n",
2981 continue_hostname, continue_host_address);
2982 }
2983
2984 /* Set the flag requesting that these hosts be added to the waiting
2985 database if the delivery fails temporarily or if we are running with
2986 queue_smtp or a 2-stage queue run. This gets unset for certain
2987 kinds of error, typically those that are specific to the message. */
2988
2989 update_waiting = TRUE;
2990
2991 /* If a host list is not defined for the addresses - they must all have the
2992 same one in order to be passed to a single transport - or if the transport has
2993 a host list with hosts_override set, use the host list supplied with the
2994 transport. It is an error for this not to exist. */
2995
2996 if (hostlist == NULL || (ob->hosts_override && ob->hosts != NULL))
2997 {
2998 if (ob->hosts == NULL)
2999 {
3000 addrlist->message = string_sprintf("%s transport called with no hosts set",
3001 tblock->name);
3002 addrlist->transport_return = PANIC;
3003 return FALSE; /* Only top address has status */
3004 }
3005
3006 DEBUG(D_transport) debug_printf("using the transport's hosts: %s\n",
3007 ob->hosts);
3008
3009 /* If the transport's host list contains no '$' characters, and we are not
3010 randomizing, it is fixed and therefore a chain of hosts can be built once
3011 and for all, and remembered for subsequent use by other calls to this
3012 transport. If, on the other hand, the host list does contain '$', or we are
3013 randomizing its order, we have to rebuild it each time. In the fixed case,
3014 as the hosts string will never be used again, it doesn't matter that we
3015 replace all the : characters with zeros. */
3016
3017 if (ob->hostlist == NULL)
3018 {
3019 uschar *s = ob->hosts;
3020
3021 if (Ustrchr(s, '$') != NULL)
3022 {
3023 if (!(expanded_hosts = expand_string(s)))
3024 {
3025 addrlist->message = string_sprintf("failed to expand list of hosts "
3026 "\"%s\" in %s transport: %s", s, tblock->name, expand_string_message);
3027 addrlist->transport_return = search_find_defer? DEFER : PANIC;
3028 return FALSE; /* Only top address has status */
3029 }
3030 DEBUG(D_transport) debug_printf("expanded list of hosts \"%s\" to "
3031 "\"%s\"\n", s, expanded_hosts);
3032 s = expanded_hosts;
3033 }
3034 else
3035 if (ob->hosts_randomize) s = expanded_hosts = string_copy(s);
3036
3037 host_build_hostlist(&hostlist, s, ob->hosts_randomize);
3038
3039 /* Check that the expansion yielded something useful. */
3040 if (hostlist == NULL)
3041 {
3042 addrlist->message =
3043 string_sprintf("%s transport has empty hosts setting", tblock->name);
3044 addrlist->transport_return = PANIC;
3045 return FALSE; /* Only top address has status */
3046 }
3047
3048 /* If there was no expansion of hosts, save the host list for
3049 next time. */
3050
3051 if (!expanded_hosts) ob->hostlist = hostlist;
3052 }
3053
3054 /* This is not the first time this transport has been run in this delivery;
3055 the host list was built previously. */
3056
3057 else
3058 hostlist = ob->hostlist;
3059 }
3060
3061 /* The host list was supplied with the address. If hosts_randomize is set, we
3062 must sort it into a random order if it did not come from MX records and has not
3063 already been randomized (but don't bother if continuing down an existing
3064 connection). */
3065
3066 else if (ob->hosts_randomize && hostlist->mx == MX_NONE && !continuing)
3067 {
3068 host_item *newlist = NULL;
3069 while (hostlist != NULL)
3070 {
3071 host_item *h = hostlist;
3072 hostlist = hostlist->next;
3073
3074 h->sort_key = random_number(100);
3075
3076 if (newlist == NULL)
3077 {
3078 h->next = NULL;
3079 newlist = h;
3080 }
3081 else if (h->sort_key < newlist->sort_key)
3082 {
3083 h->next = newlist;
3084 newlist = h;
3085 }
3086 else
3087 {
3088 host_item *hh = newlist;
3089 while (hh->next != NULL)
3090 {
3091 if (h->sort_key < hh->next->sort_key) break;
3092 hh = hh->next;
3093 }
3094 h->next = hh->next;
3095 hh->next = h;
3096 }
3097 }
3098
3099 hostlist = addrlist->host_list = newlist;
3100 }
3101
3102 /* Sort out the default port. */
3103
3104 if (!smtp_get_port(ob->port, addrlist, &port, tid)) return FALSE;
3105
3106 /* For each host-plus-IP-address on the list:
3107
3108 . If this is a continued delivery and the host isn't the one with the
3109 current connection, skip.
3110
3111 . If the status is unusable (i.e. previously failed or retry checked), skip.
3112
3113 . If no IP address set, get the address, either by turning the name into
3114 an address, calling gethostbyname if gethostbyname is on, or by calling
3115 the DNS. The DNS may yield multiple addresses, in which case insert the
3116 extra ones into the list.
3117
3118 . Get the retry data if not previously obtained for this address and set the
3119 field which remembers the state of this address. Skip if the retry time is
3120 not reached. If not, remember whether retry data was found. The retry string
3121 contains both the name and the IP address.
3122
3123 . Scan the list of addresses and mark those whose status is DEFER as
3124 PENDING_DEFER. These are the only ones that will be processed in this cycle
3125 of the hosts loop.
3126
3127 . Make a delivery attempt - addresses marked PENDING_DEFER will be tried.
3128 Some addresses may be successfully delivered, others may fail, and yet
3129 others may get temporary errors and so get marked DEFER.
3130
3131 . The return from the delivery attempt is OK if a connection was made and a
3132 valid SMTP dialogue was completed. Otherwise it is DEFER.
3133
3134 . If OK, add a "remove" retry item for this host/IPaddress, if any.
3135
3136 . If fail to connect, or other defer state, add a retry item.
3137
3138 . If there are any addresses whose status is still DEFER, carry on to the
3139 next host/IPaddress, unless we have tried the number of hosts given
3140 by hosts_max_try or hosts_max_try_hardlimit; otherwise return. Note that
3141 there is some fancy logic for hosts_max_try that means its limit can be
3142 overstepped in some circumstances.
3143
3144 If we get to the end of the list, all hosts have deferred at least one address,
3145 or not reached their retry times. If delay_after_cutoff is unset, it requests a
3146 delivery attempt to those hosts whose last try was before the arrival time of
3147 the current message. To cope with this, we have to go round the loop a second
3148 time. After that, set the status and error data for any addresses that haven't
3149 had it set already. */
3150
3151 for (cutoff_retry = 0; expired &&
3152 cutoff_retry < ((ob->delay_after_cutoff)? 1 : 2);
3153 cutoff_retry++)
3154 {
3155 host_item *nexthost = NULL;
3156 int unexpired_hosts_tried = 0;
3157
3158 for (host = hostlist;
3159 host != NULL &&
3160 unexpired_hosts_tried < ob->hosts_max_try &&
3161 total_hosts_tried < ob->hosts_max_try_hardlimit;
3162 host = nexthost)
3163 {
3164 int rc;
3165 int host_af;
3166 uschar *rs;
3167 BOOL serialized = FALSE;
3168 BOOL host_is_expired = FALSE;
3169 BOOL message_defer = FALSE;
3170 BOOL ifchanges = FALSE;
3171 BOOL some_deferred = FALSE;
3172 address_item *first_addr = NULL;
3173 uschar *interface = NULL;
3174 uschar *retry_host_key = NULL;
3175 uschar *retry_message_key = NULL;
3176 uschar *serialize_key = NULL;
3177
3178 /* Default next host is next host. :-) But this can vary if the
3179 hosts_max_try limit is hit (see below). It may also be reset if a host
3180 address is looked up here (in case the host was multihomed). */
3181
3182 nexthost = host->next;
3183
3184 /* If the address hasn't yet been obtained from the host name, look it up
3185 now, unless the host is already marked as unusable. If it is marked as
3186 unusable, it means that the router was unable to find its IP address (in
3187 the DNS or wherever) OR we are in the 2nd time round the cutoff loop, and
3188 the lookup failed last time. We don't get this far if *all* MX records
3189 point to non-existent hosts; that is treated as a hard error.
3190
3191 We can just skip this host entirely. When the hosts came from the router,
3192 the address will timeout based on the other host(s); when the address is
3193 looked up below, there is an explicit retry record added.
3194
3195 Note that we mustn't skip unusable hosts if the address is not unset; they
3196 may be needed as expired hosts on the 2nd time round the cutoff loop. */
3197
3198 if (host->address == NULL)
3199 {
3200 int new_port, flags;
3201 host_item *hh;
3202
3203 if (host->status >= hstatus_unusable)
3204 {
3205 DEBUG(D_transport) debug_printf("%s has no address and is unusable - skipping\n",
3206 host->name);
3207 continue;
3208 }
3209
3210 DEBUG(D_transport) debug_printf("getting address for %s\n", host->name);
3211
3212 /* The host name is permitted to have an attached port. Find it, and
3213 strip it from the name. Just remember it for now. */
3214
3215 new_port = host_item_get_port(host);
3216
3217 /* Count hosts looked up */
3218
3219 hosts_looked_up++;
3220
3221 /* Find by name if so configured, or if it's an IP address. We don't
3222 just copy the IP address, because we need the test-for-local to happen. */
3223
3224 flags = HOST_FIND_BY_A;
3225 if (ob->dns_qualify_single) flags |= HOST_FIND_QUALIFY_SINGLE;
3226 if (ob->dns_search_parents) flags |= HOST_FIND_SEARCH_PARENTS;
3227
3228 if (ob->gethostbyname || string_is_ip_address(host->name, NULL) != 0)
3229 rc = host_find_byname(host, NULL, flags, NULL, TRUE);
3230 else
3231 rc = host_find_bydns(host, NULL, flags, NULL, NULL, NULL,
3232 ob->dnssec_request_domains, ob->dnssec_require_domains,
3233 NULL, NULL);
3234
3235 /* Update the host (and any additional blocks, resulting from
3236 multihoming) with a host-specific port, if any. */
3237
3238 for (hh = host; hh != nexthost; hh = hh->next) hh->port = new_port;
3239
3240 /* Failure to find the host at this time (usually DNS temporary failure)
3241 is really a kind of routing failure rather than a transport failure.
3242 Therefore we add a retry item of the routing kind, not to stop us trying
3243 to look this name up here again, but to ensure the address gets timed
3244 out if the failures go on long enough. A complete failure at this point
3245 commonly points to a configuration error, but the best action is still
3246 to carry on for the next host. */
3247
3248 if (rc == HOST_FIND_AGAIN || rc == HOST_FIND_FAILED)
3249 {
3250 retry_add_item(addrlist, string_sprintf("R:%s", host->name), 0);
3251 expired = FALSE;
3252 if (rc == HOST_FIND_AGAIN) hosts_defer++; else hosts_fail++;
3253 DEBUG(D_transport) debug_printf("rc = %s for %s\n", (rc == HOST_FIND_AGAIN)?
3254 "HOST_FIND_AGAIN" : "HOST_FIND_FAILED", host->name);
3255 host->status = hstatus_unusable;
3256
3257 for (addr = addrlist; addr != NULL; addr = addr->next)
3258 {
3259 if (addr->transport_return != DEFER) continue;
3260 addr->basic_errno = ERRNO_UNKNOWNHOST;
3261 addr->message =
3262 string_sprintf("failed to lookup IP address for %s", host->name);
3263 }
3264 continue;
3265 }
3266
3267 /* If the host is actually the local host, we may have a problem, or
3268 there may be some cunning configuration going on. In the problem case,
3269 log things and give up. The default transport status is already DEFER. */
3270
3271 if (rc == HOST_FOUND_LOCAL && !ob->allow_localhost)
3272 {
3273 for (addr = addrlist; addr != NULL; addr = addr->next)
3274 {
3275 addr->basic_errno = 0;
3276 addr->message = string_sprintf("%s transport found host %s to be "
3277 "local", tblock->name, host->name);
3278 }
3279 goto END_TRANSPORT;
3280 }
3281 } /* End of block for IP address lookup */
3282
3283 /* If this is a continued delivery, we are interested only in the host
3284 which matches the name of the existing open channel. The check is put
3285 here after the local host lookup, in case the name gets expanded as a
3286 result of the lookup. Set expired FALSE, to save the outer loop executing
3287 twice. */
3288
3289 if (continuing && (Ustrcmp(continue_hostname, host->name) != 0 ||
3290 Ustrcmp(continue_host_address, host->address) != 0))
3291 {
3292 expired = FALSE;
3293 continue; /* With next host */
3294 }
3295
3296 /* Reset the default next host in case a multihomed host whose addresses
3297 are not looked up till just above added to the host list. */
3298
3299 nexthost = host->next;
3300
3301 /* If queue_smtp is set (-odqs or the first part of a 2-stage run), or the
3302 domain is in queue_smtp_domains, we don't actually want to attempt any
3303 deliveries. When doing a queue run, queue_smtp_domains is always unset. If
3304 there is a lookup defer in queue_smtp_domains, proceed as if the domain
3305 were not in it. We don't want to hold up all SMTP deliveries! Except when
3306 doing a two-stage queue run, don't do this if forcing. */
3307
3308 if ((!deliver_force || queue_2stage) && (queue_smtp ||
3309 match_isinlist(addrlist->domain,
3310 (const uschar **)&queue_smtp_domains, 0,
3311 &domainlist_anchor, NULL, MCL_DOMAIN, TRUE, NULL) == OK))
3312 {
3313 expired = FALSE;
3314 for (addr = addrlist; addr != NULL; addr = addr->next)
3315 {
3316 if (addr->transport_return != DEFER) continue;
3317 addr->message = US"domain matches queue_smtp_domains, or -odqs set";
3318 }
3319 continue; /* With next host */
3320 }
3321
3322 /* Count hosts being considered - purely for an intelligent comment
3323 if none are usable. */
3324
3325 hosts_total++;
3326
3327 /* Set $host and $host address now in case they are needed for the
3328 interface expansion or the serialize_hosts check; they remain set if an
3329 actual delivery happens. */
3330
3331 deliver_host = host->name;
3332 deliver_host_address = host->address;
3333 lookup_dnssec_authenticated = host->dnssec == DS_YES ? US"yes"
3334 : host->dnssec == DS_NO ? US"no"
3335 : US"";
3336
3337 /* Set up a string for adding to the retry key if the port number is not
3338 the standard SMTP port. A host may have its own port setting that overrides
3339 the default. */
3340
3341 pistring = string_sprintf(":%d", (host->port == PORT_NONE)?
3342 port : host->port);
3343 if (Ustrcmp(pistring, ":25") == 0) pistring = US"";
3344
3345 /* Select IPv4 or IPv6, and choose an outgoing interface. If the interface
3346 string changes upon expansion, we must add it to the key that is used for
3347 retries, because connections to the same host from a different interface
3348 should be treated separately. */
3349
3350 host_af = (Ustrchr(host->address, ':') == NULL)? AF_INET : AF_INET6;
3351 if (!smtp_get_interface(ob->interface, host_af, addrlist, &ifchanges,
3352 &interface, tid))
3353 return FALSE;
3354 if (ifchanges) pistring = string_sprintf("%s/%s", pistring, interface);
3355
3356 /* The first time round the outer loop, check the status of the host by
3357 inspecting the retry data. The second time round, we are interested only
3358 in expired hosts that haven't been tried since this message arrived. */
3359
3360 if (cutoff_retry == 0)
3361 {
3362 BOOL incl_ip;
3363 /* Ensure the status of the address is set by checking retry data if
3364 necessary. There may be host-specific retry data (applicable to all
3365 messages) and also data for retries of a specific message at this host.
3366 If either of these retry records are actually read, the keys used are
3367 returned to save recomputing them later. */
3368
3369 if (exp_bool(addrlist, US"transport", tblock->name, D_transport,
3370 US"retry_include_ip_address", ob->retry_include_ip_address,
3371 ob->expand_retry_include_ip_address, &incl_ip) != OK)
3372 continue; /* with next host */
3373
3374 host_is_expired = retry_check_address(addrlist->domain, host, pistring,
3375 incl_ip, &retry_host_key, &retry_message_key);
3376
3377 DEBUG(D_transport) debug_printf("%s [%s]%s status = %s\n", host->name,
3378 (host->address == NULL)? US"" : host->address, pistring,
3379 (host->status == hstatus_usable)? "usable" :
3380 (host->status == hstatus_unusable)? "unusable" :
3381 (host->status == hstatus_unusable_expired)? "unusable (expired)" : "?");
3382
3383 /* Skip this address if not usable at this time, noting if it wasn't
3384 actually expired, both locally and in the address. */
3385
3386 switch (host->status)
3387 {
3388 case hstatus_unusable:
3389 expired = FALSE;
3390 setflag(addrlist, af_retry_skipped);
3391 /* Fall through */
3392
3393 case hstatus_unusable_expired:
3394 switch (host->why)
3395 {
3396 case hwhy_retry: hosts_retry++; break;
3397 case hwhy_failed: hosts_fail++; break;
3398 case hwhy_deferred: hosts_defer++; break;
3399 }
3400
3401 /* If there was a retry message key, implying that previously there
3402 was a message-specific defer, we don't want to update the list of
3403 messages waiting for these hosts. */
3404
3405 if (retry_message_key != NULL) update_waiting = FALSE;
3406 continue; /* With the next host or IP address */
3407 }
3408 }
3409
3410 /* Second time round the loop: if the address is set but expired, and
3411 the message is newer than the last try, let it through. */
3412
3413 else
3414 {
3415 if (host->address == NULL ||
3416 host->status != hstatus_unusable_expired ||
3417 host->last_try > received_time)
3418 continue;
3419 DEBUG(D_transport)
3420 debug_printf("trying expired host %s [%s]%s\n",
3421 host->name, host->address, pistring);
3422 host_is_expired = TRUE;
3423 }
3424
3425 /* Setting "expired=FALSE" doesn't actually mean not all hosts are expired;
3426 it remains TRUE only if all hosts are expired and none are actually tried.
3427 */
3428
3429 expired = FALSE;
3430
3431 /* If this host is listed as one to which access must be serialized,
3432 see if another Exim process has a connection to it, and if so, skip
3433 this host. If not, update the database to record our connection to it
3434 and remember this for later deletion. Do not do any of this if we are
3435 sending the message down a pre-existing connection. */
3436
3437 if (!continuing &&
3438 verify_check_given_host(&ob->serialize_hosts, host) == OK)
3439 {
3440 serialize_key = string_sprintf("host-serialize-%s", host->name);
3441 if (!enq_start(serialize_key))
3442 {
3443 DEBUG(D_transport)
3444 debug_printf("skipping host %s because another Exim process "
3445 "is connected to it\n", host->name);
3446 hosts_serial++;
3447 continue;
3448 }
3449 serialized = TRUE;
3450 }
3451
3452 /* OK, we have an IP address that is not waiting for its retry time to
3453 arrive (it might be expired) OR (second time round the loop) we have an
3454 expired host that hasn't been tried since the message arrived. Have a go
3455 at delivering the message to it. First prepare the addresses by flushing
3456 out the result of previous attempts, and finding the first address that
3457 is still to be delivered. */
3458
3459 first_addr = prepare_addresses(addrlist, host);
3460
3461 DEBUG(D_transport) debug_printf("delivering %s to %s [%s] (%s%s)\n",
3462 message_id, host->name, host->address, addrlist->address,
3463 (addrlist->next == NULL)? "" : ", ...");
3464
3465 set_process_info("delivering %s to %s [%s] (%s%s)",
3466 message_id, host->name, host->address, addrlist->address,
3467 (addrlist->next == NULL)? "" : ", ...");
3468
3469 /* This is not for real; don't do the delivery. If there are
3470 any remaining hosts, list them. */
3471
3472 if (dont_deliver)
3473 {
3474 host_item *host2;
3475 set_errno(addrlist, 0, NULL, OK, FALSE, NULL);
3476 for (addr = addrlist; addr != NULL; addr = addr->next)
3477 {
3478 addr->host_used = host;
3479 addr->special_action = '*';
3480 addr->message = US"delivery bypassed by -N option";
3481 }
3482 DEBUG(D_transport)
3483 {
3484 debug_printf("*** delivery by %s transport bypassed by -N option\n"
3485 "*** host and remaining hosts:\n", tblock->name);
3486 for (host2 = host; host2 != NULL; host2 = host2->next)
3487 debug_printf(" %s [%s]\n", host2->name,
3488 (host2->address == NULL)? US"unset" : host2->address);
3489 }
3490 rc = OK;
3491 }
3492
3493 /* This is for real. If the host is expired, we don't count it for
3494 hosts_max_retry. This ensures that all hosts must expire before an address
3495 is timed out, unless hosts_max_try_hardlimit (which protects against
3496 lunatic DNS configurations) is reached.
3497
3498 If the host is not expired and we are about to hit the hosts_max_retry
3499 limit, check to see if there is a subsequent hosts with a different MX
3500 value. If so, make that the next host, and don't count this one. This is a
3501 heuristic to make sure that different MXs do get tried. With a normal kind
3502 of retry rule, they would get tried anyway when the earlier hosts were
3503 delayed, but if the domain has a "retry every time" type of rule - as is
3504 often used for the the very large ISPs, that won't happen. */
3505
3506 else
3507 {
3508 host_item * thost;
3509 /* Make a copy of the host if it is local to this invocation
3510 of the transport. */
3511
3512 if (expanded_hosts)
3513 {
3514 thost = store_get(sizeof(host_item));
3515 *thost = *host;
3516 thost->name = string_copy(host->name);
3517 thost->address = string_copy(host->address);
3518 }
3519 else
3520 thost = host;
3521
3522 if (!host_is_expired && ++unexpired_hosts_tried >= ob->hosts_max_try)
3523 {
3524 host_item *h;
3525 DEBUG(D_transport)
3526 debug_printf("hosts_max_try limit reached with this host\n");
3527 for (h = host; h != NULL; h = h->next)
3528 if (h->mx != host->mx) break;
3529 if (h != NULL)
3530 {
3531 nexthost = h;
3532 unexpired_hosts_tried--;
3533 DEBUG(D_transport) debug_printf("however, a higher MX host exists "
3534 "and will be tried\n");
3535 }
3536 }
3537
3538 /* Attempt the delivery. */
3539
3540 total_hosts_tried++;
3541 rc = smtp_deliver(addrlist, thost, host_af, port, interface, tblock,
3542 &message_defer, FALSE);
3543
3544 /* Yield is one of:
3545 OK => connection made, each address contains its result;
3546 message_defer is set for message-specific defers (when all
3547 recipients are marked defer)
3548 DEFER => there was a non-message-specific delivery problem;
3549 ERROR => there was a problem setting up the arguments for a filter,
3550 or there was a problem with expanding added headers
3551 */
3552
3553 /* If the result is not OK, there was a non-message-specific problem.
3554 If the result is DEFER, we need to write to the logs saying what happened
3555 for this particular host, except in the case of authentication and TLS
3556 failures, where the log has already been written. If all hosts defer a
3557 general message is written at the end. */
3558
3559 if (rc == DEFER && first_addr->basic_errno != ERRNO_AUTHFAIL &&
3560 first_addr->basic_errno != ERRNO_TLSFAILURE)
3561 write_logs(first_addr, host);
3562
3563 #ifdef EXPERIMENTAL_EVENT
3564 if (rc == DEFER)
3565 deferred_event_raise(first_addr, host);
3566 #endif
3567
3568 /* If STARTTLS was accepted, but there was a failure in setting up the
3569 TLS session (usually a certificate screwup), and the host is not in
3570 hosts_require_tls, and tls_tempfail_tryclear is true, try again, with
3571 TLS forcibly turned off. We have to start from scratch with a new SMTP
3572 connection. That's why the retry is done from here, not from within
3573 smtp_deliver(). [Rejections of STARTTLS itself don't screw up the
3574 session, so the in-clear transmission after those errors, if permitted,
3575 happens inside smtp_deliver().] */
3576
3577 #ifdef SUPPORT_TLS
3578 if ( rc == DEFER
3579 && first_addr->basic_errno == ERRNO_TLSFAILURE
3580 && ob->tls_tempfail_tryclear
3581 && verify_check_given_host(&ob->hosts_require_tls, host) != OK
3582 )
3583 {
3584 log_write(0, LOG_MAIN, "TLS session failure: delivering unencrypted "
3585 "to %s [%s] (not in hosts_require_tls)", host->name, host->address);
3586 first_addr = prepare_addresses(addrlist, host);
3587 rc = smtp_deliver(addrlist, thost, host_af, port, interface, tblock,
3588 &message_defer, TRUE);
3589 if (rc == DEFER && first_addr->basic_errno != ERRNO_AUTHFAIL)
3590 write_logs(first_addr, host);
3591 # ifdef EXPERIMENTAL_EVENT
3592 if (rc == DEFER)
3593 deferred_event_raise(first_addr, host);
3594 # endif
3595 }
3596 #endif /*SUPPORT_TLS*/
3597 }
3598
3599 /* Delivery attempt finished */
3600
3601 rs = (rc == OK)? US"OK" : (rc == DEFER)? US"DEFER" : (rc == ERROR)?
3602 US"ERROR" : US"?";
3603
3604 set_process_info("delivering %s: just tried %s [%s] for %s%s: result %s",
3605 message_id, host->name, host->address, addrlist->address,
3606 (addrlist->next == NULL)? "" : " (& others)", rs);
3607
3608 /* Release serialization if set up */
3609
3610 if (serialized) enq_end(serialize_key);
3611
3612 /* If the result is DEFER, or if a host retry record is known to exist, we
3613 need to add an item to the retry chain for updating the retry database
3614 at the end of delivery. We only need to add the item to the top address,
3615 of course. Also, if DEFER, we mark the IP address unusable so as to skip it
3616 for any other delivery attempts using the same address. (It is copied into
3617 the unusable tree at the outer level, so even if different address blocks
3618 contain the same address, it still won't get tried again.) */
3619
3620 if (rc == DEFER || retry_host_key != NULL)
3621 {
3622 int delete_flag = (rc != DEFER)? rf_delete : 0;
3623 if (retry_host_key == NULL)
3624 {
3625 BOOL incl_ip;
3626 if (exp_bool(addrlist, US"transport", tblock->name, D_transport,
3627 US"retry_include_ip_address", ob->retry_include_ip_address,
3628 ob->expand_retry_include_ip_address, &incl_ip) != OK)
3629 incl_ip = TRUE; /* error; use most-specific retry record */
3630
3631 retry_host_key = incl_ip ?
3632 string_sprintf("T:%S:%s%s", host->name, host->address, pistring) :
3633 string_sprintf("T:%S%s", host->name, pistring);
3634 }
3635
3636 /* If a delivery of another message over an existing SMTP connection
3637 yields DEFER, we do NOT set up retry data for the host. This covers the
3638 case when there are delays in routing the addresses in the second message
3639 that are so long that the server times out. This is alleviated by not
3640 routing addresses that previously had routing defers when handling an
3641 existing connection, but even so, this case may occur (e.g. if a
3642 previously happily routed address starts giving routing defers). If the
3643 host is genuinely down, another non-continued message delivery will
3644 notice it soon enough. */
3645
3646 if (delete_flag != 0 || !continuing)
3647 retry_add_item(first_addr, retry_host_key, rf_host | delete_flag);
3648
3649 /* We may have tried an expired host, if its retry time has come; ensure
3650 the status reflects the expiry for the benefit of any other addresses. */
3651
3652 if (rc == DEFER)
3653 {
3654 host->status = (host_is_expired)?
3655 hstatus_unusable_expired : hstatus_unusable;
3656 host->why = hwhy_deferred;
3657 }
3658 }
3659
3660 /* If message_defer is set (host was OK, but every recipient got deferred
3661 because of some message-specific problem), or if that had happened
3662 previously so that a message retry key exists, add an appropriate item
3663 to the retry chain. Note that if there was a message defer but now there is
3664 a host defer, the message defer record gets deleted. That seems perfectly
3665 reasonable. Also, stop the message from being remembered as waiting
3666 for specific hosts. */
3667
3668 if (message_defer || retry_message_key != NULL)
3669 {
3670 int delete_flag = message_defer? 0 : rf_delete;
3671 if (retry_message_key == NULL)
3672 {
3673 BOOL incl_ip;
3674 if (exp_bool(addrlist, US"transport", tblock->name, D_transport,
3675 US"retry_include_ip_address", ob->retry_include_ip_address,
3676 ob->expand_retry_include_ip_address, &incl_ip) != OK)
3677 incl_ip = TRUE; /* error; use most-specific retry record */
3678
3679 retry_message_key = incl_ip ?
3680 string_sprintf("T:%S:%s%s:%s", host->name, host->address, pistring,
3681 message_id) :
3682 string_sprintf("T:%S%s:%s", host->name, pistring, message_id);
3683 }
3684 retry_add_item(addrlist, retry_message_key,
3685 rf_message | rf_host | delete_flag);
3686 update_waiting = FALSE;
3687 }
3688
3689 /* Any return other than DEFER (that is, OK or ERROR) means that the
3690 addresses have got their final statuses filled in for this host. In the OK
3691 case, see if any of them are deferred. */
3692
3693 if (rc == OK)
3694 {
3695 for (addr = addrlist; addr != NULL; addr = addr->next)
3696 {
3697 if (addr->transport_return == DEFER)
3698 {
3699 some_deferred = TRUE;
3700 break;
3701 }
3702 }
3703 }
3704
3705 /* If no addresses deferred or the result was ERROR, return. We do this for
3706 ERROR because a failing filter set-up or add_headers expansion is likely to
3707 fail for any host we try. */
3708
3709 if (rc == ERROR || (rc == OK && !some_deferred))
3710 {
3711 DEBUG(D_transport) debug_printf("Leaving %s transport\n", tblock->name);
3712 return TRUE; /* Each address has its status */
3713 }
3714
3715 /* If the result was DEFER or some individual addresses deferred, let
3716 the loop run to try other hosts with the deferred addresses, except for the
3717 case when we were trying to deliver down an existing channel and failed.
3718 Don't try any other hosts in this case. */
3719
3720 if (continuing) break;
3721
3722 /* If the whole delivery, or some individual addresses, were deferred and
3723 there are more hosts that could be tried, do not count this host towards
3724 the hosts_max_try limit if the age of the message is greater than the
3725 maximum retry time for this host. This means we may try try all hosts,
3726 ignoring the limit, when messages have been around for some time. This is
3727 important because if we don't try all hosts, the address will never time
3728 out. NOTE: this does not apply to hosts_max_try_hardlimit. */
3729
3730 if ((rc == DEFER || some_deferred) && nexthost != NULL)
3731 {
3732 BOOL timedout;
3733 retry_config *retry = retry_find_config(host->name, NULL, 0, 0);
3734
3735 if (retry != NULL && retry->rules != NULL)
3736 {
3737 retry_rule *last_rule;
3738 for (last_rule = retry->rules;
3739 last_rule->next != NULL;
3740 last_rule = last_rule->next);
3741 timedout = time(NULL) - received_time > last_rule->timeout;
3742 }
3743 else timedout = TRUE; /* No rule => timed out */
3744
3745 if (timedout)
3746 {
3747 unexpired_hosts_tried--;
3748 DEBUG(D_transport) debug_printf("temporary delivery error(s) override "
3749 "hosts_max_try (message older than host's retry time)\n");
3750 }
3751 }
3752 } /* End of loop for trying multiple hosts. */
3753
3754 /* This is the end of the loop that repeats iff expired is TRUE and
3755 ob->delay_after_cutoff is FALSE. The second time round we will
3756 try those hosts that haven't been tried since the message arrived. */
3757
3758 DEBUG(D_transport)
3759 {
3760 debug_printf("all IP addresses skipped or deferred at least one address\n");
3761 if (expired && !ob->delay_after_cutoff && cutoff_retry == 0)
3762 debug_printf("retrying IP addresses not tried since message arrived\n");
3763 }
3764 }
3765
3766
3767 /* Get here if all IP addresses are skipped or defer at least one address. In
3768 MUA wrapper mode, this will happen only for connection or other non-message-
3769 specific failures. Force the delivery status for all addresses to FAIL. */
3770
3771 if (mua_wrapper)
3772 {
3773 for (addr = addrlist; addr != NULL; addr = addr->next)
3774 addr->transport_return = FAIL;
3775 goto END_TRANSPORT;
3776 }
3777
3778 /* In the normal, non-wrapper case, add a standard message to each deferred
3779 address if there hasn't been an error, that is, if it hasn't actually been
3780 tried this time. The variable "expired" will be FALSE if any deliveries were
3781 actually tried, or if there was at least one host that was not expired. That
3782 is, it is TRUE only if no deliveries were tried and all hosts were expired. If
3783 a delivery has been tried, an error code will be set, and the failing of the
3784 message is handled by the retry code later.
3785
3786 If queue_smtp is set, or this transport was called to send a subsequent message
3787 down an existing TCP/IP connection, and something caused the host not to be
3788 found, we end up here, but can detect these cases and handle them specially. */
3789
3790 for (addr = addrlist; addr != NULL; addr = addr->next)
3791 {
3792 /* If host is not NULL, it means that we stopped processing the host list
3793 because of hosts_max_try or hosts_max_try_hardlimit. In the former case, this
3794 means we need to behave as if some hosts were skipped because their retry
3795 time had not come. Specifically, this prevents the address from timing out.
3796 However, if we have hit hosts_max_try_hardlimit, we want to behave as if all
3797 hosts were tried. */
3798
3799 if (host != NULL)
3800 {
3801 if (total_hosts_tried >= ob->hosts_max_try_hardlimit)
3802 {
3803 DEBUG(D_transport)
3804 debug_printf("hosts_max_try_hardlimit reached: behave as if all "
3805 "hosts were tried\n");
3806 }
3807 else
3808 {
3809 DEBUG(D_transport)
3810 debug_printf("hosts_max_try limit caused some hosts to be skipped\n");
3811 setflag(addr, af_retry_skipped);
3812 }
3813 }
3814
3815 if (queue_smtp) /* no deliveries attempted */
3816 {
3817 addr->transport_return = DEFER;
3818 addr->basic_errno = 0;
3819 addr->message = US"SMTP delivery explicitly queued";
3820 }
3821
3822 else if (addr->transport_return == DEFER &&
3823 (addr->basic_errno == ERRNO_UNKNOWNERROR || addr->basic_errno == 0) &&
3824 addr->message == NULL)
3825 {
3826 addr->basic_errno = ERRNO_HRETRY;
3827 if (continue_hostname != NULL)
3828 {
3829 addr->message = US"no host found for existing SMTP connection";
3830 }
3831 else if (expired)
3832 {
3833 setflag(addr, af_pass_message); /* This is not a security risk */
3834 addr->message = (ob->delay_after_cutoff)?
3835 US"retry time not reached for any host after a long failure period" :
3836 US"all hosts have been failing for a long time and were last tried "
3837 "after this message arrived";
3838
3839 /* If we are already using fallback hosts, or there are no fallback hosts
3840 defined, convert the result to FAIL to cause a bounce. */
3841
3842 if (addr->host_list == addr->fallback_hosts ||
3843 addr->fallback_hosts == NULL)
3844 addr->transport_return = FAIL;
3845 }
3846 else
3847 {
3848 if (hosts_retry == hosts_total)
3849 addr->message = US"retry time not reached for any host";
3850 else if (hosts_fail == hosts_total)
3851 addr->message = US"all host address lookups failed permanently";
3852 else if (hosts_defer == hosts_total)
3853 addr->message = US"all host address lookups failed temporarily";
3854 else if (hosts_serial == hosts_total)
3855 addr->message = US"connection limit reached for all hosts";
3856 else if (hosts_fail+hosts_defer == hosts_total)
3857 addr->message = US"all host address lookups failed";
3858 else addr->message = US"some host address lookups failed and retry time "
3859 "not reached for other hosts or connection limit reached";
3860 }
3861 }
3862 }
3863
3864 /* Update the database which keeps information about which messages are waiting
3865 for which hosts to become available. For some message-specific errors, the
3866 update_waiting flag is turned off because we don't want follow-on deliveries in
3867 those cases. If this transport instance is explicitly limited to one message
3868 per connection then follow-on deliveries are not possible and there's no need
3869 to create/update the per-transport wait-<transport_name> database. */
3870
3871 if (update_waiting && tblock->connection_max_messages != 1)
3872 transport_update_waiting(hostlist, tblock->name);
3873
3874 END_TRANSPORT:
3875
3876 DEBUG(D_transport) debug_printf("Leaving %s transport\n", tblock->name);
3877
3878 return TRUE; /* Each address has its status */
3879 }
3880
3881 /* vi: aw ai sw=2
3882 */
3883 /* End of transport/smtp.c */
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