1 /*************************************************
2 * Exim - an Internet mail transport agent *
3 *************************************************/
5 /* Copyright (c) University of Cambridge 1995 - 2016 */
6 /* See the file NOTICE for conditions of use and distribution. */
12 #define PENDING_DEFER (PENDING + DEFER)
13 #define PENDING_OK (PENDING + OK)
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. */
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)) },
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) },
46 { "dkim_canon", opt_stringptr,
47 (void *)offsetof(smtp_transport_options_block, dkim.dkim_canon) },
48 { "dkim_domain", opt_stringptr,
49 (void *)offsetof(smtp_transport_options_block, dkim.dkim_domain) },
50 { "dkim_private_key", opt_stringptr,
51 (void *)offsetof(smtp_transport_options_block, dkim.dkim_private_key) },
52 { "dkim_selector", opt_stringptr,
53 (void *)offsetof(smtp_transport_options_block, dkim.dkim_selector) },
54 { "dkim_sign_headers", opt_stringptr,
55 (void *)offsetof(smtp_transport_options_block, dkim.dkim_sign_headers) },
56 { "dkim_strict", opt_stringptr,
57 (void *)offsetof(smtp_transport_options_block, dkim.dkim_strict) },
59 { "dns_qualify_single", opt_bool,
60 (void *)offsetof(smtp_transport_options_block, dns_qualify_single) },
61 { "dns_search_parents", opt_bool,
62 (void *)offsetof(smtp_transport_options_block, dns_search_parents) },
63 { "dnssec_request_domains", opt_stringptr,
64 (void *)offsetof(smtp_transport_options_block, dnssec.request) },
65 { "dnssec_require_domains", opt_stringptr,
66 (void *)offsetof(smtp_transport_options_block, dnssec.require) },
67 { "dscp", opt_stringptr,
68 (void *)offsetof(smtp_transport_options_block, dscp) },
69 { "fallback_hosts", opt_stringptr,
70 (void *)offsetof(smtp_transport_options_block, fallback_hosts) },
71 { "final_timeout", opt_time,
72 (void *)offsetof(smtp_transport_options_block, final_timeout) },
73 { "gethostbyname", opt_bool,
74 (void *)offsetof(smtp_transport_options_block, gethostbyname) },
75 { "helo_data", opt_stringptr,
76 (void *)offsetof(smtp_transport_options_block, helo_data) },
77 { "hosts", opt_stringptr,
78 (void *)offsetof(smtp_transport_options_block, hosts) },
79 { "hosts_avoid_esmtp", opt_stringptr,
80 (void *)offsetof(smtp_transport_options_block, hosts_avoid_esmtp) },
81 { "hosts_avoid_pipelining", opt_stringptr,
82 (void *)offsetof(smtp_transport_options_block, hosts_avoid_pipelining) },
84 { "hosts_avoid_tls", opt_stringptr,
85 (void *)offsetof(smtp_transport_options_block, hosts_avoid_tls) },
87 { "hosts_max_try", opt_int,
88 (void *)offsetof(smtp_transport_options_block, hosts_max_try) },
89 { "hosts_max_try_hardlimit", opt_int,
90 (void *)offsetof(smtp_transport_options_block, hosts_max_try_hardlimit) },
92 { "hosts_nopass_tls", opt_stringptr,
93 (void *)offsetof(smtp_transport_options_block, hosts_nopass_tls) },
95 { "hosts_override", opt_bool,
96 (void *)offsetof(smtp_transport_options_block, hosts_override) },
97 { "hosts_randomize", opt_bool,
98 (void *)offsetof(smtp_transport_options_block, hosts_randomize) },
99 #if defined(SUPPORT_TLS) && !defined(DISABLE_OCSP)
100 { "hosts_request_ocsp", opt_stringptr,
101 (void *)offsetof(smtp_transport_options_block, hosts_request_ocsp) },
103 { "hosts_require_auth", opt_stringptr,
104 (void *)offsetof(smtp_transport_options_block, hosts_require_auth) },
106 # ifdef EXPERIMENTAL_DANE
107 { "hosts_require_dane", opt_stringptr,
108 (void *)offsetof(smtp_transport_options_block, hosts_require_dane) },
110 # ifndef DISABLE_OCSP
111 { "hosts_require_ocsp", opt_stringptr,
112 (void *)offsetof(smtp_transport_options_block, hosts_require_ocsp) },
114 { "hosts_require_tls", opt_stringptr,
115 (void *)offsetof(smtp_transport_options_block, hosts_require_tls) },
117 { "hosts_try_auth", opt_stringptr,
118 (void *)offsetof(smtp_transport_options_block, hosts_try_auth) },
119 #if defined(SUPPORT_TLS) && defined(EXPERIMENTAL_DANE)
120 { "hosts_try_dane", opt_stringptr,
121 (void *)offsetof(smtp_transport_options_block, hosts_try_dane) },
124 { "hosts_try_prdr", opt_stringptr,
125 (void *)offsetof(smtp_transport_options_block, hosts_try_prdr) },
128 { "hosts_verify_avoid_tls", opt_stringptr,
129 (void *)offsetof(smtp_transport_options_block, hosts_verify_avoid_tls) },
131 { "interface", opt_stringptr,
132 (void *)offsetof(smtp_transport_options_block, interface) },
133 { "keepalive", opt_bool,
134 (void *)offsetof(smtp_transport_options_block, keepalive) },
135 { "lmtp_ignore_quota", opt_bool,
136 (void *)offsetof(smtp_transport_options_block, lmtp_ignore_quota) },
137 { "max_rcpt", opt_int | opt_public,
138 (void *)offsetof(transport_instance, max_addresses) },
139 { "multi_domain", opt_expand_bool | opt_public,
140 (void *)offsetof(transport_instance, multi_domain) },
141 { "port", opt_stringptr,
142 (void *)offsetof(smtp_transport_options_block, port) },
143 { "protocol", opt_stringptr,
144 (void *)offsetof(smtp_transport_options_block, protocol) },
145 { "retry_include_ip_address", opt_expand_bool,
146 (void *)offsetof(smtp_transport_options_block, retry_include_ip_address) },
147 { "serialize_hosts", opt_stringptr,
148 (void *)offsetof(smtp_transport_options_block, serialize_hosts) },
149 { "size_addition", opt_int,
150 (void *)offsetof(smtp_transport_options_block, size_addition) }
152 ,{ "socks_proxy", opt_stringptr,
153 (void *)offsetof(smtp_transport_options_block, socks_proxy) }
156 ,{ "tls_certificate", opt_stringptr,
157 (void *)offsetof(smtp_transport_options_block, tls_certificate) },
158 { "tls_crl", opt_stringptr,
159 (void *)offsetof(smtp_transport_options_block, tls_crl) },
160 { "tls_dh_min_bits", opt_int,
161 (void *)offsetof(smtp_transport_options_block, tls_dh_min_bits) },
162 { "tls_privatekey", opt_stringptr,
163 (void *)offsetof(smtp_transport_options_block, tls_privatekey) },
164 { "tls_require_ciphers", opt_stringptr,
165 (void *)offsetof(smtp_transport_options_block, tls_require_ciphers) },
166 { "tls_sni", opt_stringptr,
167 (void *)offsetof(smtp_transport_options_block, tls_sni) },
168 { "tls_tempfail_tryclear", opt_bool,
169 (void *)offsetof(smtp_transport_options_block, tls_tempfail_tryclear) },
170 { "tls_try_verify_hosts", opt_stringptr,
171 (void *)offsetof(smtp_transport_options_block, tls_try_verify_hosts) },
172 { "tls_verify_cert_hostnames", opt_stringptr,
173 (void *)offsetof(smtp_transport_options_block,tls_verify_cert_hostnames)},
174 { "tls_verify_certificates", opt_stringptr,
175 (void *)offsetof(smtp_transport_options_block, tls_verify_certificates) },
176 { "tls_verify_hosts", opt_stringptr,
177 (void *)offsetof(smtp_transport_options_block, tls_verify_hosts) }
181 /* Size of the options list. An extern variable has to be used so that its
182 address can appear in the tables drtables.c. */
184 int smtp_transport_options_count =
185 sizeof(smtp_transport_options)/sizeof(optionlist);
187 /* Default private options block for the smtp transport. */
189 smtp_transport_options_block smtp_transport_option_defaults = {
191 NULL, /* fallback_hosts */
193 NULL, /* fallback_hostlist */
194 NULL, /* authenticated_sender */
195 US"$primary_hostname", /* helo_data */
196 NULL, /* interface */
198 US"smtp", /* protocol */
200 NULL, /* serialize_hosts */
201 NULL, /* hosts_try_auth */
202 NULL, /* hosts_require_auth */
203 #ifdef EXPERIMENTAL_DANE
204 NULL, /* hosts_try_dane */
205 NULL, /* hosts_require_dane */
208 US"*", /* hosts_try_prdr */
211 US"*", /* hosts_request_ocsp (except under DANE; tls_client_start()) */
212 NULL, /* hosts_require_ocsp */
214 NULL, /* hosts_require_tls */
215 NULL, /* hosts_avoid_tls */
216 NULL, /* hosts_verify_avoid_tls */
217 NULL, /* hosts_avoid_pipelining */
218 NULL, /* hosts_avoid_esmtp */
219 NULL, /* hosts_nopass_tls */
220 5*60, /* command_timeout */
221 5*60, /* connect_timeout; shorter system default overrides */
222 5*60, /* data timeout */
223 10*60, /* final timeout */
224 1024, /* size_addition */
225 5, /* hosts_max_try */
226 50, /* hosts_max_try_hardlimit */
227 TRUE, /* address_retry_include_sender */
228 FALSE, /* allow_localhost */
229 FALSE, /* authenticated_sender_force */
230 FALSE, /* gethostbyname */
231 TRUE, /* dns_qualify_single */
232 FALSE, /* dns_search_parents */
233 { NULL, NULL }, /* dnssec_domains {request,require} */
234 TRUE, /* delay_after_cutoff */
235 FALSE, /* hosts_override */
236 FALSE, /* hosts_randomize */
237 TRUE, /* keepalive */
238 FALSE, /* lmtp_ignore_quota */
239 NULL, /* expand_retry_include_ip_address */
240 TRUE /* retry_include_ip_address */
242 ,NULL /* socks_proxy */
245 ,NULL, /* tls_certificate */
247 NULL, /* tls_privatekey */
248 NULL, /* tls_require_ciphers */
250 US"system", /* tls_verify_certificates */
251 EXIM_CLIENT_DH_DEFAULT_MIN_BITS,
252 /* tls_dh_min_bits */
253 TRUE, /* tls_tempfail_tryclear */
254 NULL, /* tls_verify_hosts */
255 US"*", /* tls_try_verify_hosts */
256 US"*" /* tls_verify_cert_hostnames */
259 , {NULL, /* dkim_canon */
260 NULL, /* dkim_domain */
261 NULL, /* dkim_private_key */
262 NULL, /* dkim_selector */
263 NULL, /* dkim_sign_headers */
264 NULL} /* dkim_strict */
268 /* some DSN flags for use later */
270 static int rf_list[] = {rf_notify_never, rf_notify_success,
271 rf_notify_failure, rf_notify_delay };
273 static uschar *rf_names[] = { US"NEVER", US"SUCCESS", US"FAILURE", US"DELAY" };
279 static uschar *smtp_command; /* Points to last cmd for error messages */
280 static uschar *mail_command; /* Points to MAIL cmd for error messages */
281 static BOOL update_waiting; /* TRUE to update the "wait" database */
284 /*************************************************
285 * Setup entry point *
286 *************************************************/
288 /* This function is called when the transport is about to be used,
289 but before running it in a sub-process. It is used for two things:
291 (1) To set the fallback host list in addresses, when delivering.
292 (2) To pass back the interface, port, protocol, and other options, for use
293 during callout verification.
296 tblock pointer to the transport instance block
297 addrlist list of addresses about to be transported
298 tf if not NULL, pointer to block in which to return options
299 uid the uid that will be set (not used)
300 gid the gid that will be set (not used)
301 errmsg place for error message (not used)
303 Returns: OK always (FAIL, DEFER not used)
307 smtp_transport_setup(transport_instance *tblock, address_item *addrlist,
308 transport_feedback *tf, uid_t uid, gid_t gid, uschar **errmsg)
310 smtp_transport_options_block *ob =
311 (smtp_transport_options_block *)(tblock->options_block);
313 errmsg = errmsg; /* Keep picky compilers happy */
317 /* Pass back options if required. This interface is getting very messy. */
321 tf->interface = ob->interface;
323 tf->protocol = ob->protocol;
324 tf->hosts = ob->hosts;
325 tf->hosts_override = ob->hosts_override;
326 tf->hosts_randomize = ob->hosts_randomize;
327 tf->gethostbyname = ob->gethostbyname;
328 tf->qualify_single = ob->dns_qualify_single;
329 tf->search_parents = ob->dns_search_parents;
330 tf->helo_data = ob->helo_data;
333 /* Set the fallback host list for all the addresses that don't have fallback
334 host lists, provided that the local host wasn't present in the original host
337 if (!testflag(addrlist, af_local_host_removed))
339 for (; addrlist != NULL; addrlist = addrlist->next)
340 if (addrlist->fallback_hosts == NULL)
341 addrlist->fallback_hosts = ob->fallback_hostlist;
349 /*************************************************
350 * Initialization entry point *
351 *************************************************/
353 /* Called for each instance, after its options have been read, to
354 enable consistency checks to be done, or anything else that needs
357 Argument: pointer to the transport instance block
362 smtp_transport_init(transport_instance *tblock)
364 smtp_transport_options_block *ob =
365 (smtp_transport_options_block *)(tblock->options_block);
367 /* Retry_use_local_part defaults FALSE if unset */
369 if (tblock->retry_use_local_part == TRUE_UNSET)
370 tblock->retry_use_local_part = FALSE;
372 /* Set the default port according to the protocol */
374 if (ob->port == NULL)
375 ob->port = (strcmpic(ob->protocol, US"lmtp") == 0)? US"lmtp" :
376 (strcmpic(ob->protocol, US"smtps") == 0)? US"smtps" : US"smtp";
378 /* Set up the setup entry point, to be called before subprocesses for this
381 tblock->setup = smtp_transport_setup;
383 /* Complain if any of the timeouts are zero. */
385 if (ob->command_timeout <= 0 || ob->data_timeout <= 0 ||
386 ob->final_timeout <= 0)
387 log_write(0, LOG_PANIC_DIE|LOG_CONFIG,
388 "command, data, or final timeout value is zero for %s transport",
391 /* If hosts_override is set and there are local hosts, set the global
392 flag that stops verify from showing router hosts. */
394 if (ob->hosts_override && ob->hosts != NULL) tblock->overrides_hosts = TRUE;
396 /* If there are any fallback hosts listed, build a chain of host items
397 for them, but do not do any lookups at this time. */
399 host_build_hostlist(&(ob->fallback_hostlist), ob->fallback_hosts, FALSE);
406 /*************************************************
407 * Set delivery info into all active addresses *
408 *************************************************/
410 /* Only addresses whose status is >= PENDING are relevant. A lesser
411 status means that an address is not currently being processed.
414 addrlist points to a chain of addresses
415 errno_value to put in each address's errno field
416 msg to put in each address's message field
417 rc to put in each address's transport_return field
418 pass_message if TRUE, set the "pass message" flag in the address
419 host if set, mark addrs as having used this host
420 smtp_greeting from peer
421 helo_response from peer
423 If errno_value has the special value ERRNO_CONNECTTIMEOUT, ETIMEDOUT is put in
424 the errno field, and RTEF_CTOUT is ORed into the more_errno field, to indicate
425 this particular type of timeout.
431 set_errno(address_item *addrlist, int errno_value, uschar *msg, int rc,
432 BOOL pass_message, host_item * host
433 #ifdef EXPERIMENTAL_DSN_INFO
434 , const uschar * smtp_greeting, const uschar * helo_response
440 if (errno_value == ERRNO_CONNECTTIMEOUT)
442 errno_value = ETIMEDOUT;
443 orvalue = RTEF_CTOUT;
445 for (addr = addrlist; addr; addr = addr->next)
446 if (addr->transport_return >= PENDING)
448 addr->basic_errno = errno_value;
449 addr->more_errno |= orvalue;
453 if (pass_message) setflag(addr, af_pass_message);
455 addr->transport_return = rc;
458 addr->host_used = host;
459 #ifdef EXPERIMENTAL_DSN_INFO
461 {uschar * s = Ustrchr(smtp_greeting, '\n'); if (s) *s = '\0';}
462 addr->smtp_greeting = smtp_greeting;
465 {uschar * s = Ustrchr(helo_response, '\n'); if (s) *s = '\0';}
466 addr->helo_response = helo_response;
473 set_errno_nohost(address_item *addrlist, int errno_value, uschar *msg, int rc,
476 set_errno(addrlist, errno_value, msg, rc, pass_message, NULL
477 #ifdef EXPERIMENTAL_DSN_INFO
484 /*************************************************
485 * Check an SMTP response *
486 *************************************************/
488 /* This function is given an errno code and the SMTP response buffer
489 to analyse, together with the host identification for generating messages. It
490 sets an appropriate message and puts the first digit of the response code into
491 the yield variable. If no response was actually read, a suitable digit is
495 host the current host, to get its name for messages
496 errno_value pointer to the errno value
497 more_errno from the top address for use with ERRNO_FILTER_FAIL
498 buffer the SMTP response buffer
499 yield where to put a one-digit SMTP response code
500 message where to put an errror message
501 pass_message set TRUE if message is an SMTP response
503 Returns: TRUE if an SMTP "QUIT" command should be sent, else FALSE
507 check_response(host_item *host, int *errno_value, int more_errno,
508 uschar *buffer, int *yield, uschar **message, BOOL *pass_message)
512 if (smtp_use_pipelining &&
513 (Ustrcmp(smtp_command, "MAIL") == 0 ||
514 Ustrcmp(smtp_command, "RCPT") == 0 ||
515 Ustrcmp(smtp_command, "DATA") == 0))
518 *yield = '4'; /* Default setting is to give a temporary error */
520 /* Handle response timeout */
522 if (*errno_value == ETIMEDOUT)
524 *message = US string_sprintf("SMTP timeout after %s%s",
526 if (transport_count > 0)
527 *message = US string_sprintf("%s (%d bytes written)", *message,
532 /* Handle malformed SMTP response */
534 if (*errno_value == ERRNO_SMTPFORMAT)
536 const uschar *malfresp = string_printing(buffer);
537 while (isspace(*malfresp)) malfresp++;
538 *message = *malfresp == 0
539 ? string_sprintf("Malformed SMTP reply (an empty line) "
540 "in response to %s%s", pl, smtp_command)
541 : string_sprintf("Malformed SMTP reply in response to %s%s: %s",
542 pl, smtp_command, malfresp);
546 /* Handle a failed filter process error; can't send QUIT as we mustn't
549 if (*errno_value == ERRNO_FILTER_FAIL)
551 *message = US string_sprintf("transport filter process failed (%d)%s",
553 (more_errno == EX_EXECFAILED)? ": unable to execute command" : "");
557 /* Handle a failed add_headers expansion; can't send QUIT as we mustn't
560 if (*errno_value == ERRNO_CHHEADER_FAIL)
563 US string_sprintf("failed to expand headers_add or headers_remove: %s",
564 expand_string_message);
568 /* Handle failure to write a complete data block */
570 if (*errno_value == ERRNO_WRITEINCOMPLETE)
572 *message = US string_sprintf("failed to write a data block");
577 /* Handle lack of advertised SMTPUTF8, for international message */
578 if (*errno_value == ERRNO_UTF8_FWD)
580 *message = US string_sprintf("utf8 support required but not offered for forwarding");
581 DEBUG(D_deliver|D_transport) debug_printf("%s\n", *message);
586 /* Handle error responses from the remote mailer. */
590 const uschar *s = string_printing(buffer);
591 *message = US string_sprintf("SMTP error from remote mail server after %s%s: "
592 "%s", pl, smtp_command, s);
593 *pass_message = TRUE;
598 /* No data was read. If there is no errno, this must be the EOF (i.e.
599 connection closed) case, which causes deferral. An explicit connection reset
600 error has the same effect. Otherwise, put the host's identity in the message,
601 leaving the errno value to be interpreted as well. In all cases, we have to
602 assume the connection is now dead. */
604 if (*errno_value == 0 || *errno_value == ECONNRESET)
606 *errno_value = ERRNO_SMTPCLOSED;
607 *message = US string_sprintf("Remote host closed connection "
608 "in response to %s%s", pl, smtp_command);
610 else *message = US string_sprintf("%s [%s]", host->name, host->address);
617 /*************************************************
618 * Write error message to logs *
619 *************************************************/
621 /* This writes to the main log and to the message log.
624 addr the address item containing error information
625 host the current host
631 write_logs(address_item *addr, host_item *host)
633 uschar * message = string_sprintf("H=%s [%s]", host->name, host->address);
635 if (LOGGING(outgoing_port))
636 message = string_sprintf("%s:%d", message,
637 host->port == PORT_NONE ? 25 : host->port);
640 message = string_sprintf("%s: %s", message, addr->message);
641 if (addr->basic_errno > 0)
642 message = string_sprintf("%s: %s", message, strerror(addr->basic_errno));
643 log_write(0, LOG_MAIN, "%s", message);
644 deliver_msglog("%s %s\n", tod_stamp(tod_log), message);
648 const uschar * s = exim_errstr(addr->basic_errno);
649 log_write(0, LOG_MAIN, "%s %s", message, s);
650 deliver_msglog("%s %s %s\n", tod_stamp(tod_log), message, s);
655 msglog_line(host_item * host, uschar * message)
657 deliver_msglog("%s H=%s [%s] %s\n", tod_stamp(tod_log),
658 host->name, host->address, message);
663 #ifndef DISABLE_EVENT
664 /*************************************************
665 * Post-defer action *
666 *************************************************/
668 /* This expands an arbitrary per-transport string.
669 It might, for example, be used to write to the database log.
672 addr the address item containing error information
673 host the current host
679 deferred_event_raise(address_item *addr, host_item *host)
681 uschar * action = addr->transport->event_action;
682 const uschar * save_domain;
688 save_domain = deliver_domain;
689 save_local = deliver_localpart;
691 /*XXX would ip & port already be set up? */
692 deliver_host_address = string_copy(host->address);
693 deliver_host_port = host->port == PORT_NONE ? 25 : host->port;
694 event_defer_errno = addr->basic_errno;
696 router_name = addr->router->name;
697 transport_name = addr->transport->name;
698 deliver_domain = addr->domain;
699 deliver_localpart = addr->local_part;
701 (void) event_raise(action, US"msg:host:defer",
703 ? addr->basic_errno > 0
704 ? string_sprintf("%s: %s", addr->message, strerror(addr->basic_errno))
705 : string_copy(addr->message)
706 : addr->basic_errno > 0
707 ? string_copy(US strerror(addr->basic_errno))
710 deliver_localpart = save_local;
711 deliver_domain = save_domain;
712 router_name = transport_name = NULL;
716 /*************************************************
717 * Synchronize SMTP responses *
718 *************************************************/
720 /* This function is called from smtp_deliver() to receive SMTP responses from
721 the server, and match them up with the commands to which they relate. When
722 PIPELINING is not in use, this function is called after every command, and is
723 therefore somewhat over-engineered, but it is simpler to use a single scheme
724 that works both with and without PIPELINING instead of having two separate sets
727 The set of commands that are buffered up with pipelining may start with MAIL
728 and may end with DATA; in between are RCPT commands that correspond to the
729 addresses whose status is PENDING_DEFER. All other commands (STARTTLS, AUTH,
730 etc.) are never buffered.
732 Errors after MAIL or DATA abort the whole process leaving the response in the
733 buffer. After MAIL, pending responses are flushed, and the original command is
734 re-instated in big_buffer for error messages. For RCPT commands, the remote is
735 permitted to reject some recipient addresses while accepting others. However
736 certain errors clearly abort the whole process. Set the value in
737 transport_return to PENDING_OK if the address is accepted. If there is a
738 subsequent general error, it will get reset accordingly. If not, it will get
739 converted to OK at the end.
742 addrlist the complete address list
743 include_affixes TRUE if affixes include in RCPT
744 sync_addr ptr to the ptr of the one to start scanning at (updated)
745 host the host we are connected to
746 count the number of responses to read
748 include_sender true if 4xx retry is to include the sender it its key
749 pending_MAIL true if the first response is for MAIL
750 pending_DATA 0 if last command sent was not DATA
751 +1 if previously had a good recipient
752 -1 if not previously had a good recipient
753 inblock incoming SMTP block
754 timeout timeout value
755 buffer buffer for reading response
756 buffsize size of buffer
758 Returns: 3 if at least one address had 2xx and one had 5xx
759 2 if at least one address had 5xx but none had 2xx
760 1 if at least one host had a 2xx response, but none had 5xx
761 0 no address had 2xx or 5xx but no errors (all 4xx, or just DATA)
762 -1 timeout while reading RCPT response
763 -2 I/O or other non-response error for RCPT
764 -3 DATA or MAIL failed - errno and buffer set
768 sync_responses(address_item *addrlist, BOOL include_affixes,
769 address_item **sync_addr, host_item *host, int count,
770 BOOL address_retry_include_sender, BOOL pending_MAIL,
771 int pending_DATA, smtp_inblock *inblock, int timeout, uschar *buffer,
774 address_item *addr = *sync_addr;
777 /* Handle the response for a MAIL command. On error, reinstate the original
778 command in big_buffer for error message use, and flush any further pending
779 responses before returning, except after I/O errors and timeouts. */
784 if (!smtp_read_response(inblock, buffer, buffsize, '2', timeout))
786 Ustrcpy(big_buffer, mail_command); /* Fits, because it came from there! */
787 if (errno == 0 && buffer[0] != 0)
789 uschar flushbuffer[4096];
791 if (buffer[0] == '4')
793 save_errno = ERRNO_MAIL4XX;
794 addr->more_errno |= ((buffer[1] - '0')*10 + buffer[2] - '0') << 8;
798 if (!smtp_read_response(inblock, flushbuffer, sizeof(flushbuffer),
800 && (errno != 0 || flushbuffer[0] == 0))
806 if (pending_DATA) count--; /* Number of RCPT responses to come */
807 while (count-- > 0) /* Mark any pending addrs with the host used */
809 while (addr->transport_return != PENDING_DEFER) addr = addr->next;
810 addr->host_used = host;
817 if (pending_DATA) count--; /* Number of RCPT responses to come */
819 /* Read and handle the required number of RCPT responses, matching each one up
820 with an address by scanning for the next address whose status is PENDING_DEFER.
825 while (addr->transport_return != PENDING_DEFER) addr = addr->next;
827 /* The address was accepted */
828 addr->host_used = host;
830 if (smtp_read_response(inblock, buffer, buffsize, '2', timeout))
833 addr->transport_return = PENDING_OK;
835 /* If af_dr_retry_exists is set, there was a routing delay on this address;
836 ensure that any address-specific retry record is expunged. We do this both
837 for the basic key and for the version that also includes the sender. */
839 if (testflag(addr, af_dr_retry_exists))
841 uschar *altkey = string_sprintf("%s:<%s>", addr->address_retry_key,
843 retry_add_item(addr, altkey, rf_delete);
844 retry_add_item(addr, addr->address_retry_key, rf_delete);
848 /* Timeout while reading the response */
850 else if (errno == ETIMEDOUT)
852 uschar *message = string_sprintf("SMTP timeout after RCPT TO:<%s>",
853 transport_rcpt_address(addr, include_affixes));
854 set_errno_nohost(addrlist, ETIMEDOUT, message, DEFER, FALSE);
855 retry_add_item(addr, addr->address_retry_key, 0);
856 update_waiting = FALSE;
860 /* Handle other errors in obtaining an SMTP response by returning -1. This
861 will cause all the addresses to be deferred. Restore the SMTP command in
862 big_buffer for which we are checking the response, so the error message
865 else if (errno != 0 || buffer[0] == 0)
867 string_format(big_buffer, big_buffer_size, "RCPT TO:<%s>",
868 transport_rcpt_address(addr, include_affixes));
872 /* Handle SMTP permanent and temporary response codes. */
877 string_sprintf("SMTP error from remote mail server after RCPT TO:<%s>: "
878 "%s", transport_rcpt_address(addr, include_affixes),
879 string_printing(buffer));
880 setflag(addr, af_pass_message);
881 msglog_line(host, addr->message);
883 /* The response was 5xx */
885 if (buffer[0] == '5')
887 addr->transport_return = FAIL;
891 /* The response was 4xx */
895 addr->transport_return = DEFER;
896 addr->basic_errno = ERRNO_RCPT4XX;
897 addr->more_errno |= ((buffer[1] - '0')*10 + buffer[2] - '0') << 8;
899 #ifndef DISABLE_EVENT
900 event_defer_errno = addr->more_errno;
901 msg_event_raise(US"msg:rcpt:host:defer", addr);
904 /* Log temporary errors if there are more hosts to be tried.
905 If not, log this last one in the == line. */
908 log_write(0, LOG_MAIN, "H=%s [%s]: %s", host->name, host->address, addr->message);
910 #ifndef DISABLE_EVENT
912 msg_event_raise(US"msg:rcpt:defer", addr);
915 /* Do not put this message on the list of those waiting for specific
916 hosts, as otherwise it is likely to be tried too often. */
918 update_waiting = FALSE;
920 /* Add a retry item for the address so that it doesn't get tried again
921 too soon. If address_retry_include_sender is true, add the sender address
924 if (address_retry_include_sender)
926 uschar *altkey = string_sprintf("%s:<%s>", addr->address_retry_key,
928 retry_add_item(addr, altkey, 0);
930 else retry_add_item(addr, addr->address_retry_key, 0);
933 } /* Loop for next RCPT response */
935 /* Update where to start at for the next block of responses, unless we
936 have already handled all the addresses. */
938 if (addr != NULL) *sync_addr = addr->next;
940 /* Handle a response to DATA. If we have not had any good recipients, either
941 previously or in this block, the response is ignored. */
943 if (pending_DATA != 0 &&
944 !smtp_read_response(inblock, buffer, buffsize, '3', timeout))
949 if (pending_DATA > 0 || (yield & 1) != 0)
951 if (errno == 0 && buffer[0] == '4')
953 errno = ERRNO_DATA4XX;
954 addrlist->more_errno |= ((buffer[1] - '0')*10 + buffer[2] - '0') << 8;
958 (void)check_response(host, &errno, 0, buffer, &code, &msg, &pass_message);
959 DEBUG(D_transport) debug_printf("%s\nerror for DATA ignored: pipelining "
960 "is in use and there were no good recipients\n", msg);
963 /* All responses read and handled; MAIL (if present) received 2xx and DATA (if
964 present) received 3xx. If any RCPTs were handled and yielded anything other
965 than 4xx, yield will be set non-zero. */
972 /* Do the client side of smtp-level authentication */
975 buffer EHLO response from server (gets overwritten)
976 addrlist chain of potential addresses to deliver
977 host host to deliver to
979 ibp, obp comms channel control blocks
982 OK Success, or failed (but not required): global "smtp_authenticated" set
983 DEFER Failed authentication (and was required)
984 ERROR Internal problem
986 FAIL_SEND Failed communications - transmit
991 smtp_auth(uschar *buffer, unsigned bufsize, address_item *addrlist, host_item *host,
992 smtp_transport_options_block *ob, BOOL is_esmtp,
993 smtp_inblock *ibp, smtp_outblock *obp)
996 uschar *fail_reason = US"server did not advertise AUTH support";
998 smtp_authenticated = FALSE;
999 client_authenticator = client_authenticated_id = client_authenticated_sender = NULL;
1000 require_auth = verify_check_given_host(&ob->hosts_require_auth, host);
1002 if (is_esmtp && !regex_AUTH) regex_AUTH =
1003 regex_must_compile(US"\\n250[\\s\\-]AUTH\\s+([\\-\\w\\s]+)(?:\\n|$)",
1006 if (is_esmtp && regex_match_and_setup(regex_AUTH, buffer, 0, -1))
1008 uschar *names = string_copyn(expand_nstring[1], expand_nlength[1]);
1009 expand_nmax = -1; /* reset */
1011 /* Must not do this check until after we have saved the result of the
1012 regex match above. */
1014 if (require_auth == OK ||
1015 verify_check_given_host(&ob->hosts_try_auth, host) == OK)
1018 fail_reason = US"no common mechanisms were found";
1020 DEBUG(D_transport) debug_printf("scanning authentication mechanisms\n");
1022 /* Scan the configured authenticators looking for one which is configured
1023 for use as a client, which is not suppressed by client_condition, and
1024 whose name matches an authentication mechanism supported by the server.
1025 If one is found, attempt to authenticate by calling its client function.
1028 for (au = auths; !smtp_authenticated && au != NULL; au = au->next)
1032 (au->client_condition != NULL &&
1033 !expand_check_condition(au->client_condition, au->name,
1034 US"client authenticator")))
1036 DEBUG(D_transport) debug_printf("skipping %s authenticator: %s\n",
1038 (au->client)? "client_condition is false" :
1039 "not configured as a client");
1043 /* Loop to scan supported server mechanisms */
1048 int len = Ustrlen(au->public_name);
1049 while (isspace(*p)) p++;
1051 if (strncmpic(au->public_name, p, len) != 0 ||
1052 (p[len] != 0 && !isspace(p[len])))
1054 while (*p != 0 && !isspace(*p)) p++;
1058 /* Found data for a listed mechanism. Call its client entry. Set
1059 a flag in the outblock so that data is overwritten after sending so
1060 that reflections don't show it. */
1062 fail_reason = US"authentication attempt(s) failed";
1063 obp->authenticating = TRUE;
1064 rc = (au->info->clientcode)(au, ibp, obp,
1065 ob->command_timeout, buffer, bufsize);
1066 obp->authenticating = FALSE;
1067 DEBUG(D_transport) debug_printf("%s authenticator yielded %d\n",
1070 /* A temporary authentication failure must hold up delivery to
1071 this host. After a permanent authentication failure, we carry on
1072 to try other authentication methods. If all fail hard, try to
1073 deliver the message unauthenticated unless require_auth was set. */
1078 smtp_authenticated = TRUE; /* stops the outer loop */
1079 client_authenticator = au->name;
1080 if (au->set_client_id != NULL)
1081 client_authenticated_id = expand_string(au->set_client_id);
1084 /* Failure after writing a command */
1089 /* Failure after reading a response */
1092 if (errno != 0 || buffer[0] != '5') return FAIL;
1093 log_write(0, LOG_MAIN, "%s authenticator failed H=%s [%s] %s",
1094 au->name, host->name, host->address, buffer);
1097 /* Failure by some other means. In effect, the authenticator
1098 decided it wasn't prepared to handle this case. Typically this
1099 is the result of "fail" in an expansion string. Do we need to
1100 log anything here? Feb 2006: a message is now put in the buffer
1101 if logging is required. */
1105 log_write(0, LOG_MAIN, "%s authenticator cancelled "
1106 "authentication H=%s [%s] %s", au->name, host->name,
1107 host->address, buffer);
1110 /* Internal problem, message in buffer. */
1113 set_errno_nohost(addrlist, ERRNO_AUTHPROB, string_copy(buffer),
1118 break; /* If not authenticated, try next authenticator */
1119 } /* Loop for scanning supported server mechanisms */
1120 } /* Loop for further authenticators */
1124 /* If we haven't authenticated, but are required to, give up. */
1126 if (require_auth == OK && !smtp_authenticated)
1128 set_errno_nohost(addrlist, ERRNO_AUTHFAIL,
1129 string_sprintf("authentication required but %s", fail_reason), DEFER,
1138 /* Construct AUTH appendix string for MAIL TO */
1141 buffer to build string
1142 addrlist chain of potential addresses to deliver
1143 ob transport options
1145 Globals smtp_authenticated
1146 client_authenticated_sender
1147 Return True on error, otherwise buffer has (possibly empty) terminated string
1151 smtp_mail_auth_str(uschar *buffer, unsigned bufsize, address_item *addrlist,
1152 smtp_transport_options_block *ob)
1154 uschar *local_authenticated_sender = authenticated_sender;
1157 debug_printf("smtp_mail_auth_str: as<%s> os<%s> SA<%s>\n", authenticated_sender, ob->authenticated_sender, smtp_authenticated?"Y":"N");
1160 if (ob->authenticated_sender != NULL)
1162 uschar *new = expand_string(ob->authenticated_sender);
1165 if (!expand_string_forcedfail)
1167 uschar *message = string_sprintf("failed to expand "
1168 "authenticated_sender: %s", expand_string_message);
1169 set_errno_nohost(addrlist, ERRNO_EXPANDFAIL, message, DEFER, FALSE);
1173 else if (new[0] != 0) local_authenticated_sender = new;
1176 /* Add the authenticated sender address if present */
1178 if ((smtp_authenticated || ob->authenticated_sender_force) &&
1179 local_authenticated_sender != NULL)
1181 string_format(buffer, bufsize, " AUTH=%s",
1182 auth_xtextencode(local_authenticated_sender,
1183 Ustrlen(local_authenticated_sender)));
1184 client_authenticated_sender = string_copy(local_authenticated_sender);
1194 #ifdef EXPERIMENTAL_DANE
1195 /* Lookup TLSA record for host/port.
1196 Return: OK success with dnssec; DANE mode
1197 DEFER Do not use this host now, may retry later
1198 FAIL_FORCED No TLSA record; DANE not usable
1199 FAIL Do not use this connection
1203 tlsa_lookup(const host_item * host, dns_answer * dnsa, BOOL dane_required)
1205 /* move this out to host.c given the similarity to dns_lookup() ? */
1207 const uschar * fullname = buffer;
1209 /* TLSA lookup string */
1210 (void)sprintf(CS buffer, "_%d._tcp.%.256s", host->port, host->name);
1212 switch (dns_lookup(dnsa, buffer, T_TLSA, &fullname))
1215 if (!dns_is_secure(dnsa))
1217 log_write(0, LOG_MAIN, "DANE error: TLSA lookup not DNSSEC");
1223 return DEFER; /* just defer this TLS'd conn */
1226 return dane_required ? FAIL : FAIL_FORCED;
1230 return dane_required ? FAIL : DEFER;
1237 typedef struct smtp_compare_s
1239 uschar *current_sender_address;
1240 struct transport_instance *tblock;
1244 Create a unique string that identifies this message, it is based on
1245 sender_address, helo_data and tls_certificate if enabled. */
1248 smtp_local_identity(uschar * sender, struct transport_instance * tblock)
1250 address_item * addr1;
1251 uschar * if1 = US"";
1252 uschar * helo1 = US"";
1254 uschar * tlsc1 = US"";
1256 uschar * save_sender_address = sender_address;
1257 uschar * local_identity = NULL;
1258 smtp_transport_options_block * ob =
1259 (smtp_transport_options_block *)tblock->options_block;
1261 sender_address = sender;
1263 addr1 = deliver_make_addr (sender, TRUE);
1264 deliver_set_expansions(addr1);
1267 if1 = expand_string(ob->interface);
1270 helo1 = expand_string(ob->helo_data);
1273 if (ob->tls_certificate)
1274 tlsc1 = expand_string(ob->tls_certificate);
1275 local_identity = string_sprintf ("%s^%s^%s", if1, helo1, tlsc1);
1277 local_identity = string_sprintf ("%s^%s", if1, helo1);
1280 deliver_set_expansions(NULL);
1281 sender_address = save_sender_address;
1283 return local_identity;
1288 /* This routine is a callback that is called from transport_check_waiting.
1289 This function will evaluate the incoming message versus the previous
1290 message. If the incoming message is using a different local identity then
1291 we will veto this new message. */
1294 smtp_are_same_identities(uschar * message_id, smtp_compare_t * s_compare)
1296 uschar * message_local_identity,
1297 * current_local_identity,
1298 * new_sender_address;
1300 current_local_identity =
1301 smtp_local_identity(s_compare->current_sender_address, s_compare->tblock);
1303 if (!(new_sender_address = deliver_get_sender_address(message_id)))
1306 message_local_identity =
1307 smtp_local_identity(new_sender_address, s_compare->tblock);
1309 return Ustrcmp(current_local_identity, message_local_identity) == 0;
1315 ehlo_response(uschar * buf, size_t bsize, uschar checks)
1318 if ( checks & PEER_OFFERED_TLS
1319 && pcre_exec(regex_STARTTLS, NULL, CS buf, bsize, 0, PCRE_EOPT, NULL, 0) < 0)
1320 checks &= ~PEER_OFFERED_TLS;
1323 if ( checks & PEER_OFFERED_IGNQ
1324 && pcre_exec(regex_IGNOREQUOTA, NULL, CS buf, bsize, 0,
1325 PCRE_EOPT, NULL, 0) < 0)
1326 checks &= ~PEER_OFFERED_IGNQ;
1328 #ifndef DISABLE_PRDR
1329 if ( checks & PEER_OFFERED_PRDR
1330 && pcre_exec(regex_PRDR, NULL, CS buf, bsize, 0, PCRE_EOPT, NULL, 0) < 0)
1331 checks &= ~PEER_OFFERED_PRDR;
1335 if ( checks & PEER_OFFERED_UTF8
1336 && pcre_exec(regex_UTF8, NULL, CS buf, bsize, 0, PCRE_EOPT, NULL, 0) < 0)
1337 checks &= ~PEER_OFFERED_UTF8;
1340 if ( checks & PEER_OFFERED_DSN
1341 && pcre_exec(regex_DSN, NULL, CS buf, bsize, 0, PCRE_EOPT, NULL, 0) < 0)
1342 checks &= ~PEER_OFFERED_DSN;
1344 if ( checks & PEER_OFFERED_PIPE
1345 && pcre_exec(regex_PIPELINING, NULL, CS buf, bsize, 0,
1346 PCRE_EOPT, NULL, 0) < 0)
1347 checks &= ~PEER_OFFERED_PIPE;
1349 if ( checks & PEER_OFFERED_SIZE
1350 && pcre_exec(regex_SIZE, NULL, CS buf, bsize, 0, PCRE_EOPT, NULL, 0) < 0)
1351 checks &= ~PEER_OFFERED_SIZE;
1357 /*************************************************
1358 * Deliver address list to given host *
1359 *************************************************/
1361 /* If continue_hostname is not null, we get here only when continuing to
1362 deliver down an existing channel. The channel was passed as the standard
1363 input. TLS is never active on a passed channel; the previous process always
1364 closes it down before passing the connection on.
1366 Otherwise, we have to make a connection to the remote host, and do the
1367 initial protocol exchange.
1369 When running as an MUA wrapper, if the sender or any recipient is rejected,
1370 temporarily or permanently, we force failure for all recipients.
1373 addrlist chain of potential addresses to deliver; only those whose
1374 transport_return field is set to PENDING_DEFER are currently
1375 being processed; others should be skipped - they have either
1376 been delivered to an earlier host or IP address, or been
1377 failed by one of them.
1378 host host to deliver to
1379 host_af AF_INET or AF_INET6
1380 port default TCP/IP port to use, in host byte order
1381 interface interface to bind to, or NULL
1382 tblock transport instance block
1383 message_defer set TRUE if yield is OK, but all addresses were deferred
1384 because of a non-recipient, non-host failure, that is, a
1385 4xx response to MAIL FROM, DATA, or ".". This is a defer
1386 that is specific to the message.
1387 suppress_tls if TRUE, don't attempt a TLS connection - this is set for
1388 a second attempt after TLS initialization fails
1390 Returns: OK - the connection was made and the delivery attempted;
1391 the result for each address is in its data block.
1392 DEFER - the connection could not be made, or something failed
1393 while setting up the SMTP session, or there was a
1394 non-message-specific error, such as a timeout.
1395 ERROR - a filter command is specified for this transport,
1396 and there was a problem setting it up; OR helo_data
1397 or add_headers or authenticated_sender is specified
1398 for this transport, and the string failed to expand
1402 smtp_deliver(address_item *addrlist, host_item *host, int host_af, int port,
1403 uschar *interface, transport_instance *tblock,
1404 BOOL *message_defer, BOOL suppress_tls)
1407 address_item *sync_addr;
1408 address_item *first_addr = addrlist;
1413 time_t start_delivery_time = time(NULL);
1414 smtp_transport_options_block *ob =
1415 (smtp_transport_options_block *)(tblock->options_block);
1416 BOOL lmtp = strcmpic(ob->protocol, US"lmtp") == 0;
1417 BOOL smtps = strcmpic(ob->protocol, US"smtps") == 0;
1419 BOOL send_rset = TRUE;
1420 BOOL send_quit = TRUE;
1421 BOOL setting_up = TRUE;
1422 BOOL completed_address = FALSE;
1425 BOOL pass_message = FALSE;
1426 uschar peer_offered = 0; /*XXX should this be handed on cf. tls_offered, smtp_use_dsn ? */
1427 #ifndef DISABLE_PRDR
1431 BOOL utf8_needed = FALSE;
1433 BOOL dsn_all_lasthop = TRUE;
1434 #if defined(SUPPORT_TLS) && defined(EXPERIMENTAL_DANE)
1436 BOOL dane_required = verify_check_given_host(&ob->hosts_require_dane, host) == OK;
1437 dns_answer tlsa_dnsa;
1439 smtp_inblock inblock;
1440 smtp_outblock outblock;
1441 int max_rcpt = tblock->max_addresses;
1442 uschar *igquotstr = US"";
1444 #ifdef EXPERIMENTAL_DSN_INFO
1445 uschar *smtp_greeting = NULL;
1446 uschar *helo_response = NULL;
1448 uschar *helo_data = NULL;
1450 uschar *message = NULL;
1451 uschar new_message_id[MESSAGE_ID_LENGTH + 1];
1453 uschar buffer[4096];
1454 uschar inbuffer[4096];
1455 uschar outbuffer[4096];
1457 suppress_tls = suppress_tls; /* stop compiler warning when no TLS support */
1459 *message_defer = FALSE;
1460 smtp_command = US"initial connection";
1461 if (max_rcpt == 0) max_rcpt = 999999;
1463 /* Set up the buffer for reading SMTP response packets. */
1465 inblock.buffer = inbuffer;
1466 inblock.buffersize = sizeof(inbuffer);
1467 inblock.ptr = inbuffer;
1468 inblock.ptrend = inbuffer;
1470 /* Set up the buffer for holding SMTP commands while pipelining */
1472 outblock.buffer = outbuffer;
1473 outblock.buffersize = sizeof(outbuffer);
1474 outblock.ptr = outbuffer;
1475 outblock.cmd_count = 0;
1476 outblock.authenticating = FALSE;
1478 /* Reset the parameters of a TLS session. */
1481 tls_out.cipher = NULL; /* the one we may use for this transport */
1482 tls_out.ourcert = NULL;
1483 tls_out.peercert = NULL;
1484 tls_out.peerdn = NULL;
1485 #if defined(SUPPORT_TLS) && !defined(USE_GNUTLS)
1488 tls_out.ocsp = OCSP_NOT_REQ;
1490 /* Flip the legacy TLS-related variables over to the outbound set in case
1491 they're used in the context of the transport. Don't bother resetting
1492 afterward as we're in a subprocess. */
1494 tls_modify_variables(&tls_out);
1499 set_errno_nohost(addrlist, ERRNO_TLSFAILURE, US"TLS support not available",
1505 /* Make a connection to the host if this isn't a continued delivery, and handle
1506 the initial interaction and HELO/EHLO/LHLO. Connect timeout errors are handled
1507 specially so they can be identified for retries. */
1509 if (continue_hostname == NULL)
1511 /* This puts port into host->port */
1512 inblock.sock = outblock.sock =
1513 smtp_connect(host, host_af, port, interface, ob->connect_timeout, tblock);
1515 if (inblock.sock < 0)
1517 set_errno_nohost(addrlist, (errno == ETIMEDOUT)? ERRNO_CONNECTTIMEOUT : errno,
1518 NULL, DEFER, FALSE);
1522 #if defined(SUPPORT_TLS) && defined(EXPERIMENTAL_DANE)
1524 tls_out.dane_verified = FALSE;
1525 tls_out.tlsa_usage = 0;
1527 if (host->dnssec == DS_YES)
1530 || verify_check_given_host(&ob->hosts_try_dane, host) == OK
1532 switch (rc = tlsa_lookup(host, &tlsa_dnsa, dane_required))
1534 case OK: dane = TRUE; break;
1535 case FAIL_FORCED: break;
1536 default: set_errno_nohost(addrlist, ERRNO_DNSDEFER,
1537 string_sprintf("DANE error: tlsa lookup %s",
1538 rc == DEFER ? "DEFER" : "FAIL"),
1543 else if (dane_required)
1545 set_errno_nohost(addrlist, ERRNO_DNSDEFER,
1546 string_sprintf("DANE error: %s lookup not DNSSEC", host->name),
1552 ob->tls_tempfail_tryclear = FALSE;
1556 /* Expand the greeting message while waiting for the initial response. (Makes
1557 sense if helo_data contains ${lookup dnsdb ...} stuff). The expansion is
1558 delayed till here so that $sending_interface and $sending_port are set. */
1560 helo_data = expand_string(ob->helo_data);
1564 uschar * errstr = NULL;
1565 if ((helo_data = string_domain_utf8_to_alabel(helo_data, &errstr)), errstr)
1567 errstr = string_sprintf("failed to expand helo_data: %s", errstr);
1568 set_errno_nohost(addrlist, ERRNO_EXPANDFAIL, errstr, DEFER, FALSE);
1575 /* The first thing is to wait for an initial OK response. The dreaded "goto"
1576 is nevertheless a reasonably clean way of programming this kind of logic,
1577 where you want to escape on any error. */
1581 BOOL good_response = smtp_read_response(&inblock, buffer, sizeof(buffer),
1582 '2', ob->command_timeout);
1583 #ifdef EXPERIMENTAL_DSN_INFO
1584 smtp_greeting = string_copy(buffer);
1586 if (!good_response) goto RESPONSE_FAILED;
1588 #ifndef DISABLE_EVENT
1591 lookup_dnssec_authenticated = host->dnssec==DS_YES ? US"yes"
1592 : host->dnssec==DS_NO ? US"no" : NULL;
1593 s = event_raise(tblock->event_action, US"smtp:connect", buffer);
1596 set_errno_nohost(addrlist, ERRNO_EXPANDFAIL,
1597 string_sprintf("deferred by smtp:connect event expansion: %s", s),
1605 /* Now check if the helo_data expansion went well, and sign off cleanly if
1608 if (helo_data == NULL)
1610 uschar *message = string_sprintf("failed to expand helo_data: %s",
1611 expand_string_message);
1612 set_errno_nohost(addrlist, ERRNO_EXPANDFAIL, message, DEFER, FALSE);
1618 /** Debugging without sending a message
1619 addrlist->transport_return = DEFER;
1623 /* Errors that occur after this point follow an SMTP command, which is
1624 left in big_buffer by smtp_write_command() for use in error messages. */
1626 smtp_command = big_buffer;
1628 /* Tell the remote who we are...
1630 February 1998: A convention has evolved that ESMTP-speaking MTAs include the
1631 string "ESMTP" in their greeting lines, so make Exim send EHLO if the
1632 greeting is of this form. The assumption was that the far end supports it
1633 properly... but experience shows that there are some that give 5xx responses,
1634 even though the banner includes "ESMTP" (there's a bloody-minded one that
1635 says "ESMTP not spoken here"). Cope with that case.
1637 September 2000: Time has passed, and it seems reasonable now to always send
1638 EHLO at the start. It is also convenient to make the change while installing
1641 July 2003: Joachim Wieland met a broken server that advertises "PIPELINING"
1642 but times out after sending MAIL FROM, RCPT TO and DATA all together. There
1643 would be no way to send out the mails, so there is now a host list
1644 "hosts_avoid_esmtp" that disables ESMTP for special hosts and solves the
1645 PIPELINING problem as well. Maybe it can also be useful to cure other
1646 problems with broken servers.
1648 Exim originally sent "Helo" at this point and ran for nearly a year that way.
1649 Then somebody tried it with a Microsoft mailer... It seems that all other
1650 mailers use upper case for some reason (the RFC is quite clear about case
1651 independence) so, for peace of mind, I gave in. */
1653 esmtp = verify_check_given_host(&ob->hosts_avoid_esmtp, host) != OK;
1655 /* Alas; be careful, since this goto is not an error-out, so conceivably
1656 we might set data between here and the target which we assume to exist
1657 and be usable. I can see this coming back to bite us. */
1662 suppress_tls = FALSE;
1663 ob->tls_tempfail_tryclear = FALSE;
1664 smtp_command = US"SSL-on-connect";
1671 if (smtp_write_command(&outblock, FALSE, "%s %s\r\n",
1672 lmtp? "LHLO" : "EHLO", helo_data) < 0)
1674 if (!smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
1675 ob->command_timeout))
1677 if (errno != 0 || buffer[0] == 0 || lmtp)
1679 #ifdef EXPERIMENTAL_DSN_INFO
1680 helo_response = string_copy(buffer);
1682 goto RESPONSE_FAILED;
1686 #ifdef EXPERIMENTAL_DSN_INFO
1687 helo_response = string_copy(buffer);
1693 debug_printf("not sending EHLO (host matches hosts_avoid_esmtp)\n");
1700 if (smtp_write_command(&outblock, FALSE, "HELO %s\r\n", helo_data) < 0)
1702 good_response = smtp_read_response(&inblock, buffer, sizeof(buffer),
1703 '2', ob->command_timeout);
1704 #ifdef EXPERIMENTAL_DSN_INFO
1705 helo_response = string_copy(buffer);
1707 if (!good_response) goto RESPONSE_FAILED;
1711 peer_offered = ehlo_response(buffer, Ustrlen(buffer),
1712 PEER_OFFERED_TLS /* others checked later */
1715 /* Set tls_offered if the response to EHLO specifies support for STARTTLS. */
1718 tls_offered = !!(peer_offered & PEER_OFFERED_TLS);
1722 /* For continuing deliveries down the same channel, the socket is the standard
1723 input, and we don't need to redo EHLO here (but may need to do so for TLS - see
1724 below). Set up the pointer to where subsequent commands will be left, for
1725 error messages. Note that smtp_use_size and smtp_use_pipelining will have been
1726 set from the command line if they were set in the process that passed the
1729 /*XXX continue case needs to propagate DSN_INFO, prob. in deliver.c
1730 as the contine goes via transport_pass_socket() and doublefork and exec.
1731 It does not wait. Unclear how we keep separate host's responses
1732 separate - we could match up by host ip+port as a bodge. */
1736 inblock.sock = outblock.sock = fileno(stdin);
1737 smtp_command = big_buffer;
1738 host->port = port; /* Record the port that was used */
1741 /* If TLS is available on this connection, whether continued or not, attempt to
1742 start up a TLS session, unless the host is in hosts_avoid_tls. If successful,
1743 send another EHLO - the server may give a different answer in secure mode. We
1744 use a separate buffer for reading the response to STARTTLS so that if it is
1745 negative, the original EHLO data is available for subsequent analysis, should
1746 the client not be required to use TLS. If the response is bad, copy the buffer
1747 for error analysis. */
1752 && verify_check_given_host(&ob->hosts_avoid_tls, host) != OK)
1754 uschar buffer2[4096];
1755 if (smtp_write_command(&outblock, FALSE, "STARTTLS\r\n") < 0)
1758 /* If there is an I/O error, transmission of this message is deferred. If
1759 there is a temporary rejection of STARRTLS and tls_tempfail_tryclear is
1760 false, we also defer. However, if there is a temporary rejection of STARTTLS
1761 and tls_tempfail_tryclear is true, or if there is an outright rejection of
1762 STARTTLS, we carry on. This means we will try to send the message in clear,
1763 unless the host is in hosts_require_tls (tested below). */
1765 if (!smtp_read_response(&inblock, buffer2, sizeof(buffer2), '2',
1766 ob->command_timeout))
1770 || (buffer2[0] == '4' && !ob->tls_tempfail_tryclear)
1773 Ustrncpy(buffer, buffer2, sizeof(buffer));
1774 goto RESPONSE_FAILED;
1778 /* STARTTLS accepted: try to negotiate a TLS session. */
1783 int rc = tls_client_start(inblock.sock, host, addrlist, tblock
1784 # ifdef EXPERIMENTAL_DANE
1785 , dane ? &tlsa_dnsa : NULL
1789 /* TLS negotiation failed; give an error. From outside, this function may
1790 be called again to try in clear on a new connection, if the options permit
1791 it for this host. */
1795 # ifdef EXPERIMENTAL_DANE
1796 if (rc == DEFER && dane)
1798 log_write(0, LOG_MAIN,
1799 "DANE attempt failed; no TLS connection to %s [%s]",
1800 host->name, host->address);
1804 save_errno = ERRNO_TLSFAILURE;
1805 message = US"failure while setting up TLS session";
1810 /* TLS session is set up */
1812 for (addr = addrlist; addr; addr = addr->next)
1813 if (addr->transport_return == PENDING_DEFER)
1815 addr->cipher = tls_out.cipher;
1816 addr->ourcert = tls_out.ourcert;
1817 addr->peercert = tls_out.peercert;
1818 addr->peerdn = tls_out.peerdn;
1819 addr->ocsp = tls_out.ocsp;
1824 /* if smtps, we'll have smtp_command set to something else; always safe to
1826 smtp_command = big_buffer;
1828 /* If we started TLS, redo the EHLO/LHLO exchange over the secure channel. If
1829 helo_data is null, we are dealing with a connection that was passed from
1830 another process, and so we won't have expanded helo_data above. We have to
1831 expand it here. $sending_ip_address and $sending_port are set up right at the
1832 start of the Exim process (in exim.c). */
1834 if (tls_out.active >= 0)
1839 if (helo_data == NULL)
1841 helo_data = expand_string(ob->helo_data);
1842 if (helo_data == NULL)
1844 uschar *message = string_sprintf("failed to expand helo_data: %s",
1845 expand_string_message);
1846 set_errno_nohost(addrlist, ERRNO_EXPANDFAIL, message, DEFER, FALSE);
1852 /* For SMTPS we need to wait for the initial OK response. */
1855 good_response = smtp_read_response(&inblock, buffer, sizeof(buffer),
1856 '2', ob->command_timeout);
1857 #ifdef EXPERIMENTAL_DSN_INFO
1858 smtp_greeting = string_copy(buffer);
1860 if (!good_response) goto RESPONSE_FAILED;
1864 greeting_cmd = "EHLO";
1867 greeting_cmd = "HELO";
1869 debug_printf("not sending EHLO (host matches hosts_avoid_esmtp)\n");
1872 if (smtp_write_command(&outblock, FALSE, "%s %s\r\n",
1873 lmtp? "LHLO" : greeting_cmd, helo_data) < 0)
1875 good_response = smtp_read_response(&inblock, buffer, sizeof(buffer),
1876 '2', ob->command_timeout);
1877 #ifdef EXPERIMENTAL_DSN_INFO
1878 helo_response = string_copy(buffer);
1880 if (!good_response) goto RESPONSE_FAILED;
1883 /* If the host is required to use a secure channel, ensure that we
1887 # ifdef EXPERIMENTAL_DANE
1890 || verify_check_given_host(&ob->hosts_require_tls, host) == OK
1893 save_errno = ERRNO_TLSREQUIRED;
1894 message = string_sprintf("a TLS session is required, but %s",
1895 tls_offered ? "an attempt to start TLS failed"
1896 : "the server did not offer TLS support");
1899 #endif /*SUPPORT_TLS*/
1901 /* If TLS is active, we have just started it up and re-done the EHLO command,
1902 so its response needs to be analyzed. If TLS is not active and this is a
1903 continued session down a previously-used socket, we haven't just done EHLO, so
1906 if (continue_hostname == NULL
1908 || tls_out.active >= 0
1913 peer_offered = ehlo_response(buffer, Ustrlen(buffer),
1915 | (lmtp && ob->lmtp_ignore_quota ? PEER_OFFERED_IGNQ : 0)
1918 | (addrlist->prop.utf8_msg ? PEER_OFFERED_UTF8 : 0)
1919 /*XXX if we hand peercaps on to continued-conn processes,
1920 must not depend on this addr */
1924 | (ob->size_addition >= 0 ? PEER_OFFERED_SIZE : 0)
1927 /* Set for IGNOREQUOTA if the response to LHLO specifies support and the
1928 lmtp_ignore_quota option was set. */
1930 igquotstr = peer_offered & PEER_OFFERED_IGNQ ? US" IGNOREQUOTA" : US"";
1932 /* If the response to EHLO specified support for the SIZE parameter, note
1933 this, provided size_addition is non-negative. */
1935 smtp_use_size = !!(peer_offered & PEER_OFFERED_SIZE);
1937 /* Note whether the server supports PIPELINING. If hosts_avoid_esmtp matched
1938 the current host, esmtp will be false, so PIPELINING can never be used. If
1939 the current host matches hosts_avoid_pipelining, don't do it. */
1941 smtp_use_pipelining = peer_offered & PEER_OFFERED_PIPE
1942 && verify_check_given_host(&ob->hosts_avoid_pipelining, host) != OK;
1944 DEBUG(D_transport) debug_printf("%susing PIPELINING\n",
1945 smtp_use_pipelining ? "" : "not ");
1947 #ifndef DISABLE_PRDR
1948 if ( peer_offered & PEER_OFFERED_PRDR
1949 && verify_check_given_host(&ob->hosts_try_prdr, host) != OK)
1950 peer_offered &= ~PEER_OFFERED_PRDR;
1952 if (peer_offered & PEER_OFFERED_PRDR)
1953 {DEBUG(D_transport) debug_printf("PRDR usable\n");}
1956 /* Note if the server supports DSN */
1957 smtp_use_dsn = !!(peer_offered & PEER_OFFERED_DSN);
1958 DEBUG(D_transport) debug_printf("%susing DSN\n", smtp_use_dsn ? "" : "not ");
1960 /* Note if the response to EHLO specifies support for the AUTH extension.
1961 If it has, check that this host is one we want to authenticate to, and do
1962 the business. The host name and address must be available when the
1963 authenticator's client driver is running. */
1965 switch (yield = smtp_auth(buffer, sizeof(buffer), addrlist, host,
1966 ob, esmtp, &inblock, &outblock))
1968 default: goto SEND_QUIT;
1970 case FAIL_SEND: goto SEND_FAILED;
1971 case FAIL: goto RESPONSE_FAILED;
1975 /* The setting up of the SMTP call is now complete. Any subsequent errors are
1976 message-specific. */
1981 if (addrlist->prop.utf8_msg)
1983 utf8_needed = !addrlist->prop.utf8_downcvt
1984 && !addrlist->prop.utf8_downcvt_maybe;
1985 DEBUG(D_transport) if (!utf8_needed) debug_printf("utf8: %s downconvert\n",
1986 addrlist->prop.utf8_downcvt ? "mandatory" : "optional");
1989 /* If this is an international message we need the host to speak SMTPUTF8 */
1990 if (utf8_needed && !(peer_offered & PEER_OFFERED_UTF8))
1992 errno = ERRNO_UTF8_FWD;
1993 goto RESPONSE_FAILED;
1997 /* If there is a filter command specified for this transport, we can now
1998 set it up. This cannot be done until the identify of the host is known. */
2000 if (tblock->filter_command != NULL)
2004 sprintf(CS buffer, "%.50s transport", tblock->name);
2005 rc = transport_set_up_command(&transport_filter_argv, tblock->filter_command,
2006 TRUE, DEFER, addrlist, buffer, NULL);
2007 transport_filter_timeout = tblock->filter_timeout;
2009 /* On failure, copy the error to all addresses, abandon the SMTP call, and
2014 set_errno_nohost(addrlist->next, addrlist->basic_errno, addrlist->message, DEFER,
2022 /* For messages that have more than the maximum number of envelope recipients,
2023 we want to send several transactions down the same SMTP connection. (See
2024 comments in deliver.c as to how this reconciles, heuristically, with
2025 remote_max_parallel.) This optimization was added to Exim after the following
2026 code was already working. The simplest way to put it in without disturbing the
2027 code was to use a goto to jump back to this point when there is another
2028 transaction to handle. */
2031 sync_addr = first_addr;
2035 completed_address = FALSE;
2038 /* Initiate a message transfer. If we know the receiving MTA supports the SIZE
2039 qualification, send it, adding something to the message size to allow for
2040 imprecision and things that get added en route. Exim keeps the number of lines
2041 in a message, so we can give an accurate value for the original message, but we
2042 need some additional to handle added headers. (Double "." characters don't get
2043 included in the count.) */
2050 sprintf(CS p, " SIZE=%d", message_size+message_linecount+ob->size_addition);
2054 #ifndef DISABLE_PRDR
2055 prdr_active = FALSE;
2056 if (peer_offered & PEER_OFFERED_PRDR)
2057 for (addr = first_addr; addr; addr = addr->next)
2058 if (addr->transport_return == PENDING_DEFER)
2060 for (addr = addr->next; addr; addr = addr->next)
2061 if (addr->transport_return == PENDING_DEFER)
2062 { /* at least two recipients to send */
2064 sprintf(CS p, " PRDR"); p += 5;
2072 if ( addrlist->prop.utf8_msg
2073 && !addrlist->prop.utf8_downcvt
2074 && peer_offered & PEER_OFFERED_UTF8
2076 sprintf(CS p, " SMTPUTF8"), p += 9;
2079 /* check if all addresses have lasthop flag */
2080 /* do not send RET and ENVID if true */
2081 for (dsn_all_lasthop = TRUE, addr = first_addr;
2082 address_count < max_rcpt && addr != NULL;
2084 if ((addr->dsn_flags & rf_dsnlasthop) != 1)
2086 dsn_all_lasthop = FALSE;
2090 /* Add any DSN flags to the mail command */
2092 if (smtp_use_dsn && !dsn_all_lasthop)
2094 if (dsn_ret == dsn_ret_hdrs)
2096 Ustrcpy(p, " RET=HDRS"); p += 9;
2098 else if (dsn_ret == dsn_ret_full)
2100 Ustrcpy(p, " RET=FULL"); p += 9;
2102 if (dsn_envid != NULL)
2104 string_format(p, sizeof(buffer) - (p-buffer), " ENVID=%s", dsn_envid);
2109 /* If an authenticated_sender override has been specified for this transport
2110 instance, expand it. If the expansion is forced to fail, and there was already
2111 an authenticated_sender for this message, the original value will be used.
2112 Other expansion failures are serious. An empty result is ignored, but there is
2113 otherwise no check - this feature is expected to be used with LMTP and other
2114 cases where non-standard addresses (e.g. without domains) might be required. */
2116 if (smtp_mail_auth_str(p, sizeof(buffer) - (p-buffer), addrlist, ob))
2122 /* From here until we send the DATA command, we can make use of PIPELINING
2123 if the server host supports it. The code has to be able to check the responses
2124 at any point, for when the buffer fills up, so we write it totally generally.
2125 When PIPELINING is off, each command written reports that it has flushed the
2128 pending_MAIL = TRUE; /* The block starts with MAIL */
2131 uschar * s = return_path;
2133 uschar * errstr = NULL;
2135 /* If we must downconvert, do the from-address here. Remember we had to
2136 for the to-addresses (done below), and also (ugly) for re-doing when building
2137 the delivery log line. */
2139 if ( addrlist->prop.utf8_msg
2140 && (addrlist->prop.utf8_downcvt || !(peer_offered & PEER_OFFERED_UTF8))
2143 if (s = string_address_utf8_to_alabel(return_path, &errstr), errstr)
2145 set_errno_nohost(addrlist, ERRNO_EXPANDFAIL, errstr, DEFER, FALSE);
2149 setflag(addrlist, af_utf8_downcvt);
2153 rc = smtp_write_command(&outblock, smtp_use_pipelining,
2154 "MAIL FROM:<%s>%s\r\n", s, buffer);
2157 mail_command = string_copy(big_buffer); /* Save for later error message */
2161 case -1: /* Transmission error */
2164 case +1: /* Block was sent */
2165 if (!smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
2166 ob->command_timeout))
2168 if (errno == 0 && buffer[0] == '4')
2170 errno = ERRNO_MAIL4XX;
2171 addrlist->more_errno |= ((buffer[1] - '0')*10 + buffer[2] - '0') << 8;
2173 goto RESPONSE_FAILED;
2175 pending_MAIL = FALSE;
2179 /* Pass over all the relevant recipient addresses for this host, which are the
2180 ones that have status PENDING_DEFER. If we are using PIPELINING, we can send
2181 several before we have to read the responses for those seen so far. This
2182 checking is done by a subroutine because it also needs to be done at the end.
2183 Send only up to max_rcpt addresses at a time, leaving first_addr pointing to
2184 the next one if not all are sent.
2186 In the MUA wrapper situation, we want to flush the PIPELINING buffer for the
2187 last address because we want to abort if any recipients have any kind of
2188 problem, temporary or permanent. We know that all recipient addresses will have
2189 the PENDING_DEFER status, because only one attempt is ever made, and we know
2190 that max_rcpt will be large, so all addresses will be done at once. */
2192 for (addr = first_addr;
2193 addr && address_count < max_rcpt;
2200 addr->dsn_aware = smtp_use_dsn ? dsn_support_yes : dsn_support_no;
2202 if (addr->transport_return != PENDING_DEFER) continue;
2205 no_flush = smtp_use_pipelining && (!mua_wrapper || addr->next);
2207 /* Add any DSN flags to the rcpt command and add to the sent string */
2212 if (smtp_use_dsn && !(addr->dsn_flags & rf_dsnlasthop))
2214 if ((addr->dsn_flags & rf_dsnflags) != 0)
2218 Ustrcpy(p, " NOTIFY=");
2220 for (i = 0; i < 4; i++)
2221 if ((addr->dsn_flags & rf_list[i]) != 0)
2223 if (!first) *p++ = ',';
2225 Ustrcpy(p, rf_names[i]);
2230 if (addr->dsn_orcpt)
2232 string_format(p, sizeof(buffer) - (p-buffer), " ORCPT=%s",
2238 /* Now send the RCPT command, and process outstanding responses when
2239 necessary. After a timeout on RCPT, we just end the function, leaving the
2240 yield as OK, because this error can often mean that there is a problem with
2241 just one address, so we don't want to delay the host. */
2243 rcpt_addr = transport_rcpt_address(addr, tblock->rcpt_include_affixes);
2247 uschar * dummy_errstr;
2248 if ( testflag(addrlist, af_utf8_downcvt)
2249 && (rcpt_addr = string_address_utf8_to_alabel(rcpt_addr, &dummy_errstr),
2253 errno = ERRNO_EXPANDFAIL;
2259 count = smtp_write_command(&outblock, no_flush, "RCPT TO:<%s>%s%s\r\n",
2260 rcpt_addr, igquotstr, buffer);
2262 if (count < 0) goto SEND_FAILED;
2265 switch(sync_responses(first_addr, tblock->rcpt_include_affixes,
2266 &sync_addr, host, count, ob->address_retry_include_sender,
2267 pending_MAIL, 0, &inblock, ob->command_timeout, buffer,
2270 case 3: ok = TRUE; /* 2xx & 5xx => OK & progress made */
2271 case 2: completed_address = TRUE; /* 5xx (only) => progress made */
2274 case 1: ok = TRUE; /* 2xx (only) => OK, but if LMTP, */
2275 if (!lmtp) completed_address = TRUE; /* can't tell about progress yet */
2276 case 0: /* No 2xx or 5xx, but no probs */
2279 case -1: goto END_OFF; /* Timeout on RCPT */
2280 default: goto RESPONSE_FAILED; /* I/O error, or any MAIL error */
2282 pending_MAIL = FALSE; /* Dealt with MAIL */
2284 } /* Loop for next address */
2286 /* If we are an MUA wrapper, abort if any RCPTs were rejected, either
2287 permanently or temporarily. We should have flushed and synced after the last
2292 address_item *badaddr;
2293 for (badaddr = first_addr; badaddr; badaddr = badaddr->next)
2294 if (badaddr->transport_return != PENDING_OK)
2296 /*XXX could we find a better errno than 0 here? */
2297 set_errno_nohost(addrlist, 0, badaddr->message, FAIL,
2298 testflag(badaddr, af_pass_message));
2304 /* If ok is TRUE, we know we have got at least one good recipient, and must now
2305 send DATA, but if it is FALSE (in the normal, non-wrapper case), we may still
2306 have a good recipient buffered up if we are pipelining. We don't want to waste
2307 time sending DATA needlessly, so we only send it if either ok is TRUE or if we
2308 are pipelining. The responses are all handled by sync_responses(). */
2310 if (ok || (smtp_use_pipelining && !mua_wrapper))
2312 int count = smtp_write_command(&outblock, FALSE, "DATA\r\n");
2313 if (count < 0) goto SEND_FAILED;
2314 switch(sync_responses(first_addr, tblock->rcpt_include_affixes, &sync_addr,
2315 host, count, ob->address_retry_include_sender, pending_MAIL,
2316 ok? +1 : -1, &inblock, ob->command_timeout, buffer, sizeof(buffer)))
2318 case 3: ok = TRUE; /* 2xx & 5xx => OK & progress made */
2319 case 2: completed_address = TRUE; /* 5xx (only) => progress made */
2322 case 1: ok = TRUE; /* 2xx (only) => OK, but if LMTP, */
2323 if (!lmtp) completed_address = TRUE; /* can't tell about progress yet */
2324 case 0: break; /* No 2xx or 5xx, but no probs */
2326 case -1: goto END_OFF; /* Timeout on RCPT */
2327 default: goto RESPONSE_FAILED; /* I/O error, or any MAIL/DATA error */
2331 /* Save the first address of the next batch. */
2335 /* If there were no good recipients (but otherwise there have been no
2336 problems), just set ok TRUE, since we have handled address-specific errors
2337 already. Otherwise, it's OK to send the message. Use the check/escape mechanism
2338 for handling the SMTP dot-handling protocol, flagging to apply to headers as
2339 well as body. Set the appropriate timeout value to be used for each chunk.
2340 (Haven't been able to make it work using select() for writing yet.) */
2346 sigalrm_seen = FALSE;
2347 transport_write_timeout = ob->data_timeout;
2348 smtp_command = US"sending data block"; /* For error messages */
2349 DEBUG(D_transport|D_v)
2350 debug_printf(" SMTP>> writing message and terminating \".\"\n");
2351 transport_count = 0;
2353 #ifndef DISABLE_DKIM
2354 ok = dkim_transport_write_message(addrlist, inblock.sock,
2355 topt_use_crlf | topt_end_dot | topt_escape_headers |
2356 (tblock->body_only? topt_no_headers : 0) |
2357 (tblock->headers_only? topt_no_body : 0) |
2358 (tblock->return_path_add? topt_add_return_path : 0) |
2359 (tblock->delivery_date_add? topt_add_delivery_date : 0) |
2360 (tblock->envelope_to_add? topt_add_envelope_to : 0),
2361 tblock->add_headers, tblock->remove_headers,
2362 US".", US"..", /* Escaping strings */
2363 tblock->rewrite_rules, tblock->rewrite_existflags,
2367 ok = transport_write_message(addrlist, inblock.sock,
2368 topt_use_crlf | topt_end_dot | topt_escape_headers |
2369 (tblock->body_only? topt_no_headers : 0) |
2370 (tblock->headers_only? topt_no_body : 0) |
2371 (tblock->return_path_add? topt_add_return_path : 0) |
2372 (tblock->delivery_date_add? topt_add_delivery_date : 0) |
2373 (tblock->envelope_to_add? topt_add_envelope_to : 0),
2374 0, /* No size limit */
2375 tblock->add_headers, tblock->remove_headers,
2376 US".", US"..", /* Escaping strings */
2377 tblock->rewrite_rules, tblock->rewrite_existflags);
2380 /* transport_write_message() uses write() because it is called from other
2381 places to write to non-sockets. This means that under some OS (e.g. Solaris)
2382 it can exit with "Broken pipe" as its error. This really means that the
2383 socket got closed at the far end. */
2385 transport_write_timeout = 0; /* for subsequent transports */
2387 /* Failure can either be some kind of I/O disaster (including timeout),
2388 or the failure of a transport filter or the expansion of added headers. */
2392 buffer[0] = 0; /* There hasn't been a response */
2393 goto RESPONSE_FAILED;
2396 /* We used to send the terminating "." explicitly here, but because of
2397 buffering effects at both ends of TCP/IP connections, you don't gain
2398 anything by keeping it separate, so it might as well go in the final
2399 data buffer for efficiency. This is now done by setting the topt_end_dot
2402 smtp_command = US"end of data";
2404 #ifndef DISABLE_PRDR
2405 /* For PRDR we optionally get a partial-responses warning
2406 * followed by the individual responses, before going on with
2407 * the overall response. If we don't get the warning then deal
2408 * with per non-PRDR. */
2411 ok = smtp_read_response(&inblock, buffer, sizeof(buffer), '3',
2413 if (!ok && errno == 0)
2416 case '2': prdr_active = FALSE;
2419 case '4': errno = ERRNO_DATA4XX;
2420 addrlist->more_errno |= ((buffer[1] - '0')*10 + buffer[2] - '0') << 8;
2427 /* For non-PRDR SMTP, we now read a single response that applies to the
2428 whole message. If it is OK, then all the addresses have been delivered. */
2432 ok = smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
2434 if (!ok && errno == 0 && buffer[0] == '4')
2436 errno = ERRNO_DATA4XX;
2437 addrlist->more_errno |= ((buffer[1] - '0')*10 + buffer[2] - '0') << 8;
2441 /* For LMTP, we get back a response for every RCPT command that we sent;
2442 some may be accepted and some rejected. For those that get a response, their
2443 status is fixed; any that are accepted have been handed over, even if later
2444 responses crash - at least, that's how I read RFC 2033.
2446 If all went well, mark the recipient addresses as completed, record which
2447 host/IPaddress they were delivered to, and cut out RSET when sending another
2448 message down the same channel. Write the completed addresses to the journal
2449 now so that they are recorded in case there is a crash of hardware or
2450 software before the spool gets updated. Also record the final SMTP
2451 confirmation if needed (for SMTP only). */
2456 int delivery_time = (int)(time(NULL) - start_delivery_time);
2458 uschar *conf = NULL;
2461 /* Set up confirmation if needed - applies only to SMTP */
2464 #ifdef DISABLE_EVENT
2465 LOGGING(smtp_confirmation) &&
2470 const uschar *s = string_printing(buffer);
2471 /* deconst cast ok here as string_printing was checked to have alloc'n'copied */
2472 conf = (s == buffer)? (uschar *)string_copy(s) : US s;
2475 /* Process all transported addresses - for LMTP or PRDR, read a status for
2478 for (addr = addrlist; addr != first_addr; addr = addr->next)
2480 if (addr->transport_return != PENDING_OK) continue;
2482 /* LMTP - if the response fails badly (e.g. timeout), use it for all the
2483 remaining addresses. Otherwise, it's a return code for just the one
2484 address. For temporary errors, add a retry item for the address so that
2485 it doesn't get tried again too soon. */
2487 #ifndef DISABLE_PRDR
2488 if (lmtp || prdr_active)
2493 if (!smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
2496 if (errno != 0 || buffer[0] == 0) goto RESPONSE_FAILED;
2497 addr->message = string_sprintf(
2498 #ifndef DISABLE_PRDR
2499 "%s error after %s: %s", prdr_active ? "PRDR":"LMTP",
2501 "LMTP error after %s: %s",
2503 big_buffer, string_printing(buffer));
2504 setflag(addr, af_pass_message); /* Allow message to go to user */
2505 if (buffer[0] == '5')
2506 addr->transport_return = FAIL;
2509 errno = ERRNO_DATA4XX;
2510 addr->more_errno |= ((buffer[1] - '0')*10 + buffer[2] - '0') << 8;
2511 addr->transport_return = DEFER;
2512 #ifndef DISABLE_PRDR
2515 retry_add_item(addr, addr->address_retry_key, 0);
2519 completed_address = TRUE; /* NOW we can set this flag */
2520 if (LOGGING(smtp_confirmation))
2522 const uschar *s = string_printing(buffer);
2523 /* deconst cast ok here as string_printing was checked to have alloc'n'copied */
2524 conf = (s == buffer)? (uschar *)string_copy(s) : US s;
2528 /* SMTP, or success return from LMTP for this address. Pass back the
2529 actual host that was used. */
2531 addr->transport_return = OK;
2532 addr->more_errno = delivery_time;
2533 addr->host_used = host;
2534 addr->special_action = flag;
2535 addr->message = conf;
2536 #ifndef DISABLE_PRDR
2537 if (prdr_active) addr->flags |= af_prdr_used;
2541 #ifndef DISABLE_PRDR
2545 /* Update the journal. For homonymic addresses, use the base address plus
2546 the transport name. See lots of comments in deliver.c about the reasons
2547 for the complications when homonyms are involved. Just carry on after
2548 write error, as it may prove possible to update the spool file later. */
2550 if (testflag(addr, af_homonym))
2551 sprintf(CS buffer, "%.500s/%s\n", addr->unique + 3, tblock->name);
2553 sprintf(CS buffer, "%.500s\n", addr->unique);
2555 DEBUG(D_deliver) debug_printf("journalling %s\n", buffer);
2556 len = Ustrlen(CS buffer);
2557 if (write(journal_fd, buffer, len) != len)
2558 log_write(0, LOG_MAIN|LOG_PANIC, "failed to write journal for "
2559 "%s: %s", buffer, strerror(errno));
2563 #ifndef DISABLE_PRDR
2566 /* PRDR - get the final, overall response. For any non-success
2567 upgrade all the address statuses. */
2568 ok = smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
2572 if(errno == 0 && buffer[0] == '4')
2574 errno = ERRNO_DATA4XX;
2575 addrlist->more_errno |= ((buffer[1] - '0')*10 + buffer[2] - '0') << 8;
2577 for (addr = addrlist; addr != first_addr; addr = addr->next)
2578 if (buffer[0] == '5' || addr->transport_return == OK)
2579 addr->transport_return = PENDING_OK; /* allow set_errno action */
2580 goto RESPONSE_FAILED;
2583 /* Update the journal, or setup retry. */
2584 for (addr = addrlist; addr != first_addr; addr = addr->next)
2585 if (addr->transport_return == OK)
2587 if (testflag(addr, af_homonym))
2588 sprintf(CS buffer, "%.500s/%s\n", addr->unique + 3, tblock->name);
2590 sprintf(CS buffer, "%.500s\n", addr->unique);
2592 DEBUG(D_deliver) debug_printf("journalling(PRDR) %s\n", buffer);
2593 len = Ustrlen(CS buffer);
2594 if (write(journal_fd, buffer, len) != len)
2595 log_write(0, LOG_MAIN|LOG_PANIC, "failed to write journal for "
2596 "%s: %s", buffer, strerror(errno));
2598 else if (addr->transport_return == DEFER)
2599 retry_add_item(addr, addr->address_retry_key, -2);
2603 /* Ensure the journal file is pushed out to disk. */
2605 if (EXIMfsync(journal_fd) < 0)
2606 log_write(0, LOG_MAIN|LOG_PANIC, "failed to fsync journal: %s",
2612 /* Handle general (not specific to one address) failures here. The value of ok
2613 is used to skip over this code on the falling through case. A timeout causes a
2614 deferral. Other errors may defer or fail according to the response code, and
2615 may set up a special errno value, e.g. after connection chopped, which is
2616 assumed if errno == 0 and there is no text in the buffer. If control reaches
2617 here during the setting up phase (i.e. before MAIL FROM) then always defer, as
2618 the problem is not related to this specific message. */
2623 uschar * set_message;
2629 send_quit = check_response(host, &save_errno, addrlist->more_errno,
2630 buffer, &code, &message, &pass_message);
2638 message = US string_sprintf("send() to %s [%s] failed: %s",
2639 host->name, host->address, strerror(save_errno));
2644 /* This label is jumped to directly when a TLS negotiation has failed,
2645 or was not done for a host for which it is required. Values will be set
2646 in message and save_errno, and setting_up will always be true. Treat as
2647 a temporary error. */
2654 /* If the failure happened while setting up the call, see if the failure was
2655 a 5xx response (this will either be on connection, or following HELO - a 5xx
2656 after EHLO causes it to try HELO). If so, fail all addresses, as this host is
2657 never going to accept them. For other errors during setting up (timeouts or
2658 whatever), defer all addresses, and yield DEFER, so that the host is not
2659 tried again for a while. */
2662 ok = FALSE; /* For when reached by GOTO */
2663 set_message = message;
2670 yield = set_rc = DEFER;
2673 /* We want to handle timeouts after MAIL or "." and loss of connection after
2674 "." specially. They can indicate a problem with the sender address or with
2675 the contents of the message rather than a real error on the connection. These
2676 cases are treated in the same way as a 4xx response. This next bit of code
2677 does the classification. */
2686 case ERRNO_UTF8_FWD:
2693 message_error = TRUE;
2697 message_error = Ustrncmp(smtp_command,"MAIL",4) == 0 ||
2698 Ustrncmp(smtp_command,"end ",4) == 0;
2701 case ERRNO_SMTPCLOSED:
2702 message_error = Ustrncmp(smtp_command,"end ",4) == 0;
2706 message_error = FALSE;
2710 /* Handle the cases that are treated as message errors. These are:
2712 (a) negative response or timeout after MAIL
2713 (b) negative response after DATA
2714 (c) negative response or timeout or dropped connection after "."
2715 (d) utf8 support required and not offered
2717 It won't be a negative response or timeout after RCPT, as that is dealt
2718 with separately above. The action in all cases is to set an appropriate
2719 error code for all the addresses, but to leave yield set to OK because the
2720 host itself has not failed. Of course, it might in practice have failed
2721 when we've had a timeout, but if so, we'll discover that at the next
2722 delivery attempt. For a temporary error, set the message_defer flag, and
2723 write to the logs for information if this is not the last host. The error
2724 for the last host will be logged as part of the address's log line. */
2728 if (mua_wrapper) code = '5'; /* Force hard failure in wrapper mode */
2730 /* If there's an errno, the message contains just the identity of
2735 else /* Anything other than 5 is treated as temporary */
2739 message = US string_sprintf("%s: %s", message, strerror(save_errno));
2740 if (host->next != NULL) log_write(0, LOG_MAIN, "%s", message);
2741 msglog_line(host, message);
2742 *message_defer = TRUE;
2746 /* Otherwise, we have an I/O error or a timeout other than after MAIL or
2747 ".", or some other transportation error. We defer all addresses and yield
2748 DEFER, except for the case of failed add_headers expansion, or a transport
2749 filter failure, when the yield should be ERROR, to stop it trying other
2755 yield = (save_errno == ERRNO_CHHEADER_FAIL ||
2756 save_errno == ERRNO_FILTER_FAIL)? ERROR : DEFER;
2760 set_errno(addrlist, save_errno, set_message, set_rc, pass_message, host
2761 #ifdef EXPERIMENTAL_DSN_INFO
2762 , smtp_greeting, helo_response
2768 /* If all has gone well, send_quit will be set TRUE, implying we can end the
2769 SMTP session tidily. However, if there were too many addresses to send in one
2770 message (indicated by first_addr being non-NULL) we want to carry on with the
2771 rest of them. Also, it is desirable to send more than one message down the SMTP
2772 connection if there are several waiting, provided we haven't already sent so
2773 many as to hit the configured limit. The function transport_check_waiting looks
2774 for a waiting message and returns its id. Then transport_pass_socket tries to
2775 set up a continued delivery by passing the socket on to another process. The
2776 variable send_rset is FALSE if a message has just been successfully transfered.
2778 If we are already sending down a continued channel, there may be further
2779 addresses not yet delivered that are aimed at the same host, but which have not
2780 been passed in this run of the transport. In this case, continue_more will be
2781 true, and all we should do is send RSET if necessary, and return, leaving the
2784 However, if no address was disposed of, i.e. all addresses got 4xx errors, we
2785 do not want to continue with other messages down the same channel, because that
2786 can lead to looping between two or more messages, all with the same,
2787 temporarily failing address(es). [The retry information isn't updated yet, so
2788 new processes keep on trying.] We probably also don't want to try more of this
2789 message's addresses either.
2791 If we have started a TLS session, we have to end it before passing the
2792 connection to a new process. However, not all servers can handle this (Exim
2793 can), so we do not pass such a connection on if the host matches
2794 hosts_nopass_tls. */
2797 debug_printf("ok=%d send_quit=%d send_rset=%d continue_more=%d "
2798 "yield=%d first_address is %sNULL\n", ok, send_quit, send_rset,
2799 continue_more, yield, (first_addr == NULL)? "":"not ");
2801 if (completed_address && ok && send_quit)
2804 smtp_compare_t t_compare;
2806 t_compare.tblock = tblock;
2807 t_compare.current_sender_address = sender_address;
2809 if ( first_addr != NULL
2811 || ( ( tls_out.active < 0
2812 || verify_check_given_host(&ob->hosts_nopass_tls, host) != OK
2815 transport_check_waiting(tblock->name, host->name,
2816 tblock->connection_max_messages, new_message_id, &more,
2817 (oicf)smtp_are_same_identities, (void*)&t_compare)
2825 if (! (ok = smtp_write_command(&outblock, FALSE, "RSET\r\n") >= 0))
2827 msg = US string_sprintf("send() to %s [%s] failed: %s", host->name,
2828 host->address, strerror(save_errno));
2831 else if (! (ok = smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
2832 ob->command_timeout)))
2835 send_quit = check_response(host, &errno, 0, buffer, &code, &msg,
2839 DEBUG(D_transport) debug_printf("H=%s [%s] %s\n",
2840 host->name, host->address, msg);
2845 /* Either RSET was not needed, or it succeeded */
2849 if (first_addr != NULL) /* More addresses still to be sent */
2850 { /* in this run of the transport */
2851 continue_sequence++; /* Causes * in logging */
2854 if (continue_more) return yield; /* More addresses for another run */
2856 /* Pass the socket to a new Exim process. Before doing so, we must shut
2857 down TLS. Not all MTAs allow for the continuation of the SMTP session
2858 when TLS is shut down. We test for this by sending a new EHLO. If we
2859 don't get a good response, we don't attempt to pass the socket on. */
2862 if (tls_out.active >= 0)
2864 tls_close(FALSE, TRUE);
2868 ok = smtp_write_command(&outblock,FALSE,"EHLO %s\r\n",helo_data) >= 0 &&
2869 smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
2870 ob->command_timeout);
2874 /* If the socket is successfully passed, we musn't send QUIT (or
2875 indeed anything!) from here. */
2877 /*XXX DSN_INFO: assume likely to do new HELO; but for greet we'll want to
2878 propagate it from the initial
2880 if (ok && transport_pass_socket(tblock->name, host->name, host->address,
2881 new_message_id, inblock.sock))
2887 /* If RSET failed and there are addresses left, they get deferred. */
2889 else set_errno(first_addr, errno, msg, DEFER, FALSE, host
2890 #ifdef EXPERIMENTAL_DSN_INFO
2891 , smtp_greeting, helo_response
2897 /* End off tidily with QUIT unless the connection has died or the socket has
2898 been passed to another process. There has been discussion on the net about what
2899 to do after sending QUIT. The wording of the RFC suggests that it is necessary
2900 to wait for a response, but on the other hand, there isn't anything one can do
2901 with an error response, other than log it. Exim used to do that. However,
2902 further discussion suggested that it is positively advantageous not to wait for
2903 the response, but to close the session immediately. This is supposed to move
2904 the TCP/IP TIME_WAIT state from the server to the client, thereby removing some
2905 load from the server. (Hosts that are both servers and clients may not see much
2906 difference, of course.) Further discussion indicated that this was safe to do
2907 on Unix systems which have decent implementations of TCP/IP that leave the
2908 connection around for a while (TIME_WAIT) after the application has gone away.
2909 This enables the response sent by the server to be properly ACKed rather than
2910 timed out, as can happen on broken TCP/IP implementations on other OS.
2912 This change is being made on 31-Jul-98. After over a year of trouble-free
2913 operation, the old commented-out code was removed on 17-Sep-99. */
2916 if (send_quit) (void)smtp_write_command(&outblock, FALSE, "QUIT\r\n");
2921 tls_close(FALSE, TRUE);
2924 /* Close the socket, and return the appropriate value, first setting
2925 works because the NULL setting is passed back to the calling process, and
2926 remote_max_parallel is forced to 1 when delivering over an existing connection,
2928 If all went well and continue_more is set, we shouldn't actually get here if
2929 there are further addresses, as the return above will be taken. However,
2930 writing RSET might have failed, or there may be other addresses whose hosts are
2931 specified in the transports, and therefore not visible at top level, in which
2932 case continue_more won't get set. */
2934 HDEBUG(D_transport|D_acl|D_v) debug_printf(" SMTP(close)>>\n");
2935 (void)close(inblock.sock);
2937 #ifndef DISABLE_EVENT
2938 (void) event_raise(tblock->event_action, US"tcp:close", NULL);
2941 continue_transport = NULL;
2942 continue_hostname = NULL;
2949 /*************************************************
2950 * Closedown entry point *
2951 *************************************************/
2953 /* This function is called when exim is passed an open smtp channel
2954 from another incarnation, but the message which it has been asked
2955 to deliver no longer exists. The channel is on stdin.
2957 We might do fancy things like looking for another message to send down
2958 the channel, but if the one we sought has gone, it has probably been
2959 delivered by some other process that itself will seek further messages,
2960 so just close down our connection.
2962 Argument: pointer to the transport instance block
2967 smtp_transport_closedown(transport_instance *tblock)
2969 smtp_transport_options_block *ob =
2970 (smtp_transport_options_block *)(tblock->options_block);
2971 smtp_inblock inblock;
2972 smtp_outblock outblock;
2974 uschar inbuffer[4096];
2975 uschar outbuffer[16];
2977 inblock.sock = fileno(stdin);
2978 inblock.buffer = inbuffer;
2979 inblock.buffersize = sizeof(inbuffer);
2980 inblock.ptr = inbuffer;
2981 inblock.ptrend = inbuffer;
2983 outblock.sock = inblock.sock;
2984 outblock.buffersize = sizeof(outbuffer);
2985 outblock.buffer = outbuffer;
2986 outblock.ptr = outbuffer;
2987 outblock.cmd_count = 0;
2988 outblock.authenticating = FALSE;
2990 (void)smtp_write_command(&outblock, FALSE, "QUIT\r\n");
2991 (void)smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
2992 ob->command_timeout);
2993 (void)close(inblock.sock);
2998 /*************************************************
2999 * Prepare addresses for delivery *
3000 *************************************************/
3002 /* This function is called to flush out error settings from previous delivery
3003 attempts to other hosts. It also records whether we got here via an MX record
3004 or not in the more_errno field of the address. We are interested only in
3005 addresses that are still marked DEFER - others may have got delivered to a
3006 previously considered IP address. Set their status to PENDING_DEFER to indicate
3007 which ones are relevant this time.
3010 addrlist the list of addresses
3011 host the host we are delivering to
3013 Returns: the first address for this delivery
3016 static address_item *
3017 prepare_addresses(address_item *addrlist, host_item *host)
3019 address_item *first_addr = NULL;
3021 for (addr = addrlist; addr != NULL; addr = addr->next)
3022 if (addr->transport_return == DEFER)
3024 if (first_addr == NULL) first_addr = addr;
3025 addr->transport_return = PENDING_DEFER;
3026 addr->basic_errno = 0;
3027 addr->more_errno = (host->mx >= 0)? 'M' : 'A';
3028 addr->message = NULL;
3030 addr->cipher = NULL;
3031 addr->ourcert = NULL;
3032 addr->peercert = NULL;
3033 addr->peerdn = NULL;
3034 addr->ocsp = OCSP_NOT_REQ;
3036 #ifdef EXPERIMENTAL_DSN_INFO
3037 addr->smtp_greeting = NULL;
3038 addr->helo_response = NULL;
3046 /*************************************************
3047 * Main entry point *
3048 *************************************************/
3050 /* See local README for interface details. As this is a remote transport, it is
3051 given a chain of addresses to be delivered in one connection, if possible. It
3052 always returns TRUE, indicating that each address has its own independent
3053 status set, except if there is a setting up problem, in which case it returns
3057 smtp_transport_entry(
3058 transport_instance *tblock, /* data for this instantiation */
3059 address_item *addrlist) /* addresses we are working on */
3063 int hosts_defer = 0;
3065 int hosts_looked_up = 0;
3066 int hosts_retry = 0;
3067 int hosts_serial = 0;
3068 int hosts_total = 0;
3069 int total_hosts_tried = 0;
3071 BOOL expired = TRUE;
3072 BOOL continuing = continue_hostname != NULL;
3073 uschar *expanded_hosts = NULL;
3075 uschar *tid = string_sprintf("%s transport", tblock->name);
3076 smtp_transport_options_block *ob =
3077 (smtp_transport_options_block *)(tblock->options_block);
3078 host_item *hostlist = addrlist->host_list;
3079 host_item *host = NULL;
3083 debug_printf("%s transport entered\n", tblock->name);
3084 for (addr = addrlist; addr != NULL; addr = addr->next)
3085 debug_printf(" %s\n", addr->address);
3086 if (continuing) debug_printf("already connected to %s [%s]\n",
3087 continue_hostname, continue_host_address);
3090 /* Set the flag requesting that these hosts be added to the waiting
3091 database if the delivery fails temporarily or if we are running with
3092 queue_smtp or a 2-stage queue run. This gets unset for certain
3093 kinds of error, typically those that are specific to the message. */
3095 update_waiting = TRUE;
3097 /* If a host list is not defined for the addresses - they must all have the
3098 same one in order to be passed to a single transport - or if the transport has
3099 a host list with hosts_override set, use the host list supplied with the
3100 transport. It is an error for this not to exist. */
3102 if (hostlist == NULL || (ob->hosts_override && ob->hosts != NULL))
3104 if (ob->hosts == NULL)
3106 addrlist->message = string_sprintf("%s transport called with no hosts set",
3108 addrlist->transport_return = PANIC;
3109 return FALSE; /* Only top address has status */
3112 DEBUG(D_transport) debug_printf("using the transport's hosts: %s\n",
3115 /* If the transport's host list contains no '$' characters, and we are not
3116 randomizing, it is fixed and therefore a chain of hosts can be built once
3117 and for all, and remembered for subsequent use by other calls to this
3118 transport. If, on the other hand, the host list does contain '$', or we are
3119 randomizing its order, we have to rebuild it each time. In the fixed case,
3120 as the hosts string will never be used again, it doesn't matter that we
3121 replace all the : characters with zeros. */
3123 if (ob->hostlist == NULL)
3125 uschar *s = ob->hosts;
3127 if (Ustrchr(s, '$') != NULL)
3129 if (!(expanded_hosts = expand_string(s)))
3131 addrlist->message = string_sprintf("failed to expand list of hosts "
3132 "\"%s\" in %s transport: %s", s, tblock->name, expand_string_message);
3133 addrlist->transport_return = search_find_defer? DEFER : PANIC;
3134 return FALSE; /* Only top address has status */
3136 DEBUG(D_transport) debug_printf("expanded list of hosts \"%s\" to "
3137 "\"%s\"\n", s, expanded_hosts);
3141 if (ob->hosts_randomize) s = expanded_hosts = string_copy(s);
3143 host_build_hostlist(&hostlist, s, ob->hosts_randomize);
3145 /* Check that the expansion yielded something useful. */
3146 if (hostlist == NULL)
3149 string_sprintf("%s transport has empty hosts setting", tblock->name);
3150 addrlist->transport_return = PANIC;
3151 return FALSE; /* Only top address has status */
3154 /* If there was no expansion of hosts, save the host list for
3157 if (!expanded_hosts) ob->hostlist = hostlist;
3160 /* This is not the first time this transport has been run in this delivery;
3161 the host list was built previously. */
3164 hostlist = ob->hostlist;
3167 /* The host list was supplied with the address. If hosts_randomize is set, we
3168 must sort it into a random order if it did not come from MX records and has not
3169 already been randomized (but don't bother if continuing down an existing
3172 else if (ob->hosts_randomize && hostlist->mx == MX_NONE && !continuing)
3174 host_item *newlist = NULL;
3175 while (hostlist != NULL)
3177 host_item *h = hostlist;
3178 hostlist = hostlist->next;
3180 h->sort_key = random_number(100);
3182 if (newlist == NULL)
3187 else if (h->sort_key < newlist->sort_key)
3194 host_item *hh = newlist;
3195 while (hh->next != NULL)
3197 if (h->sort_key < hh->next->sort_key) break;
3205 hostlist = addrlist->host_list = newlist;
3208 /* Sort out the default port. */
3210 if (!smtp_get_port(ob->port, addrlist, &port, tid)) return FALSE;
3212 /* For each host-plus-IP-address on the list:
3214 . If this is a continued delivery and the host isn't the one with the
3215 current connection, skip.
3217 . If the status is unusable (i.e. previously failed or retry checked), skip.
3219 . If no IP address set, get the address, either by turning the name into
3220 an address, calling gethostbyname if gethostbyname is on, or by calling
3221 the DNS. The DNS may yield multiple addresses, in which case insert the
3222 extra ones into the list.
3224 . Get the retry data if not previously obtained for this address and set the
3225 field which remembers the state of this address. Skip if the retry time is
3226 not reached. If not, remember whether retry data was found. The retry string
3227 contains both the name and the IP address.
3229 . Scan the list of addresses and mark those whose status is DEFER as
3230 PENDING_DEFER. These are the only ones that will be processed in this cycle
3233 . Make a delivery attempt - addresses marked PENDING_DEFER will be tried.
3234 Some addresses may be successfully delivered, others may fail, and yet
3235 others may get temporary errors and so get marked DEFER.
3237 . The return from the delivery attempt is OK if a connection was made and a
3238 valid SMTP dialogue was completed. Otherwise it is DEFER.
3240 . If OK, add a "remove" retry item for this host/IPaddress, if any.
3242 . If fail to connect, or other defer state, add a retry item.
3244 . If there are any addresses whose status is still DEFER, carry on to the
3245 next host/IPaddress, unless we have tried the number of hosts given
3246 by hosts_max_try or hosts_max_try_hardlimit; otherwise return. Note that
3247 there is some fancy logic for hosts_max_try that means its limit can be
3248 overstepped in some circumstances.
3250 If we get to the end of the list, all hosts have deferred at least one address,
3251 or not reached their retry times. If delay_after_cutoff is unset, it requests a
3252 delivery attempt to those hosts whose last try was before the arrival time of
3253 the current message. To cope with this, we have to go round the loop a second
3254 time. After that, set the status and error data for any addresses that haven't
3255 had it set already. */
3257 for (cutoff_retry = 0; expired &&
3258 cutoff_retry < ((ob->delay_after_cutoff)? 1 : 2);
3261 host_item *nexthost = NULL;
3262 int unexpired_hosts_tried = 0;
3264 for (host = hostlist;
3266 unexpired_hosts_tried < ob->hosts_max_try &&
3267 total_hosts_tried < ob->hosts_max_try_hardlimit;
3273 BOOL serialized = FALSE;
3274 BOOL host_is_expired = FALSE;
3275 BOOL message_defer = FALSE;
3276 BOOL some_deferred = FALSE;
3277 address_item *first_addr = NULL;
3278 uschar *interface = NULL;
3279 uschar *retry_host_key = NULL;
3280 uschar *retry_message_key = NULL;
3281 uschar *serialize_key = NULL;
3283 /* Default next host is next host. :-) But this can vary if the
3284 hosts_max_try limit is hit (see below). It may also be reset if a host
3285 address is looked up here (in case the host was multihomed). */
3287 nexthost = host->next;
3289 /* If the address hasn't yet been obtained from the host name, look it up
3290 now, unless the host is already marked as unusable. If it is marked as
3291 unusable, it means that the router was unable to find its IP address (in
3292 the DNS or wherever) OR we are in the 2nd time round the cutoff loop, and
3293 the lookup failed last time. We don't get this far if *all* MX records
3294 point to non-existent hosts; that is treated as a hard error.
3296 We can just skip this host entirely. When the hosts came from the router,
3297 the address will timeout based on the other host(s); when the address is
3298 looked up below, there is an explicit retry record added.
3300 Note that we mustn't skip unusable hosts if the address is not unset; they
3301 may be needed as expired hosts on the 2nd time round the cutoff loop. */
3303 if (host->address == NULL)
3305 int new_port, flags;
3308 if (host->status >= hstatus_unusable)
3310 DEBUG(D_transport) debug_printf("%s has no address and is unusable - skipping\n",
3315 DEBUG(D_transport) debug_printf("getting address for %s\n", host->name);
3317 /* The host name is permitted to have an attached port. Find it, and
3318 strip it from the name. Just remember it for now. */
3320 new_port = host_item_get_port(host);
3322 /* Count hosts looked up */
3326 /* Find by name if so configured, or if it's an IP address. We don't
3327 just copy the IP address, because we need the test-for-local to happen. */
3329 flags = HOST_FIND_BY_A;
3330 if (ob->dns_qualify_single) flags |= HOST_FIND_QUALIFY_SINGLE;
3331 if (ob->dns_search_parents) flags |= HOST_FIND_SEARCH_PARENTS;
3333 if (ob->gethostbyname || string_is_ip_address(host->name, NULL) != 0)
3334 rc = host_find_byname(host, NULL, flags, NULL, TRUE);
3336 rc = host_find_bydns(host, NULL, flags, NULL, NULL, NULL,
3337 &ob->dnssec, /* domains for request/require */
3340 /* Update the host (and any additional blocks, resulting from
3341 multihoming) with a host-specific port, if any. */
3343 for (hh = host; hh != nexthost; hh = hh->next) hh->port = new_port;
3345 /* Failure to find the host at this time (usually DNS temporary failure)
3346 is really a kind of routing failure rather than a transport failure.
3347 Therefore we add a retry item of the routing kind, not to stop us trying
3348 to look this name up here again, but to ensure the address gets timed
3349 out if the failures go on long enough. A complete failure at this point
3350 commonly points to a configuration error, but the best action is still
3351 to carry on for the next host. */
3353 if (rc == HOST_FIND_AGAIN || rc == HOST_FIND_FAILED)
3355 retry_add_item(addrlist, string_sprintf("R:%s", host->name), 0);
3357 if (rc == HOST_FIND_AGAIN) hosts_defer++; else hosts_fail++;
3358 DEBUG(D_transport) debug_printf("rc = %s for %s\n", (rc == HOST_FIND_AGAIN)?
3359 "HOST_FIND_AGAIN" : "HOST_FIND_FAILED", host->name);
3360 host->status = hstatus_unusable;
3362 for (addr = addrlist; addr != NULL; addr = addr->next)
3364 if (addr->transport_return != DEFER) continue;
3365 addr->basic_errno = ERRNO_UNKNOWNHOST;
3367 string_sprintf("failed to lookup IP address for %s", host->name);
3372 /* If the host is actually the local host, we may have a problem, or
3373 there may be some cunning configuration going on. In the problem case,
3374 log things and give up. The default transport status is already DEFER. */
3376 if (rc == HOST_FOUND_LOCAL && !ob->allow_localhost)
3378 for (addr = addrlist; addr != NULL; addr = addr->next)
3380 addr->basic_errno = 0;
3381 addr->message = string_sprintf("%s transport found host %s to be "
3382 "local", tblock->name, host->name);
3386 } /* End of block for IP address lookup */
3388 /* If this is a continued delivery, we are interested only in the host
3389 which matches the name of the existing open channel. The check is put
3390 here after the local host lookup, in case the name gets expanded as a
3391 result of the lookup. Set expired FALSE, to save the outer loop executing
3394 if (continuing && (Ustrcmp(continue_hostname, host->name) != 0 ||
3395 Ustrcmp(continue_host_address, host->address) != 0))
3398 continue; /* With next host */
3401 /* Reset the default next host in case a multihomed host whose addresses
3402 are not looked up till just above added to the host list. */
3404 nexthost = host->next;
3406 /* If queue_smtp is set (-odqs or the first part of a 2-stage run), or the
3407 domain is in queue_smtp_domains, we don't actually want to attempt any
3408 deliveries. When doing a queue run, queue_smtp_domains is always unset. If
3409 there is a lookup defer in queue_smtp_domains, proceed as if the domain
3410 were not in it. We don't want to hold up all SMTP deliveries! Except when
3411 doing a two-stage queue run, don't do this if forcing. */
3413 if ((!deliver_force || queue_2stage) && (queue_smtp ||
3414 match_isinlist(addrlist->domain,
3415 (const uschar **)&queue_smtp_domains, 0,
3416 &domainlist_anchor, NULL, MCL_DOMAIN, TRUE, NULL) == OK))
3419 for (addr = addrlist; addr != NULL; addr = addr->next)
3421 if (addr->transport_return != DEFER) continue;
3422 addr->message = US"domain matches queue_smtp_domains, or -odqs set";
3424 continue; /* With next host */
3427 /* Count hosts being considered - purely for an intelligent comment
3428 if none are usable. */
3432 /* Set $host and $host address now in case they are needed for the
3433 interface expansion or the serialize_hosts check; they remain set if an
3434 actual delivery happens. */
3436 deliver_host = host->name;
3437 deliver_host_address = host->address;
3438 lookup_dnssec_authenticated = host->dnssec == DS_YES ? US"yes"
3439 : host->dnssec == DS_NO ? US"no"
3442 /* Set up a string for adding to the retry key if the port number is not
3443 the standard SMTP port. A host may have its own port setting that overrides
3446 pistring = string_sprintf(":%d", (host->port == PORT_NONE)?
3448 if (Ustrcmp(pistring, ":25") == 0) pistring = US"";
3450 /* Select IPv4 or IPv6, and choose an outgoing interface. If the interface
3451 string is set, even if constant (as different transports can have different
3452 constant settings), we must add it to the key that is used for retries,
3453 because connections to the same host from a different interface should be
3454 treated separately. */
3456 host_af = (Ustrchr(host->address, ':') == NULL)? AF_INET : AF_INET6;
3457 if ((rs = ob->interface) && *rs)
3459 if (!smtp_get_interface(rs, host_af, addrlist, &interface, tid))
3461 pistring = string_sprintf("%s/%s", pistring, interface);
3464 /* The first time round the outer loop, check the status of the host by
3465 inspecting the retry data. The second time round, we are interested only
3466 in expired hosts that haven't been tried since this message arrived. */
3468 if (cutoff_retry == 0)
3471 /* Ensure the status of the address is set by checking retry data if
3472 necessary. There may be host-specific retry data (applicable to all
3473 messages) and also data for retries of a specific message at this host.
3474 If either of these retry records are actually read, the keys used are
3475 returned to save recomputing them later. */
3477 if (exp_bool(addrlist, US"transport", tblock->name, D_transport,
3478 US"retry_include_ip_address", ob->retry_include_ip_address,
3479 ob->expand_retry_include_ip_address, &incl_ip) != OK)
3480 continue; /* with next host */
3482 host_is_expired = retry_check_address(addrlist->domain, host, pistring,
3483 incl_ip, &retry_host_key, &retry_message_key);
3485 DEBUG(D_transport) debug_printf("%s [%s]%s status = %s\n", host->name,
3486 (host->address == NULL)? US"" : host->address, pistring,
3487 (host->status == hstatus_usable)? "usable" :
3488 (host->status == hstatus_unusable)? "unusable" :
3489 (host->status == hstatus_unusable_expired)? "unusable (expired)" : "?");
3491 /* Skip this address if not usable at this time, noting if it wasn't
3492 actually expired, both locally and in the address. */
3494 switch (host->status)
3496 case hstatus_unusable:
3498 setflag(addrlist, af_retry_skipped);
3501 case hstatus_unusable_expired:
3504 case hwhy_retry: hosts_retry++; break;
3505 case hwhy_failed: hosts_fail++; break;
3506 case hwhy_deferred: hosts_defer++; break;
3509 /* If there was a retry message key, implying that previously there
3510 was a message-specific defer, we don't want to update the list of
3511 messages waiting for these hosts. */
3513 if (retry_message_key != NULL) update_waiting = FALSE;
3514 continue; /* With the next host or IP address */
3518 /* Second time round the loop: if the address is set but expired, and
3519 the message is newer than the last try, let it through. */
3523 if (host->address == NULL ||
3524 host->status != hstatus_unusable_expired ||
3525 host->last_try > received_time)
3528 debug_printf("trying expired host %s [%s]%s\n",
3529 host->name, host->address, pistring);
3530 host_is_expired = TRUE;
3533 /* Setting "expired=FALSE" doesn't actually mean not all hosts are expired;
3534 it remains TRUE only if all hosts are expired and none are actually tried.
3539 /* If this host is listed as one to which access must be serialized,
3540 see if another Exim process has a connection to it, and if so, skip
3541 this host. If not, update the database to record our connection to it
3542 and remember this for later deletion. Do not do any of this if we are
3543 sending the message down a pre-existing connection. */
3546 verify_check_given_host(&ob->serialize_hosts, host) == OK)
3548 serialize_key = string_sprintf("host-serialize-%s", host->name);
3549 if (!enq_start(serialize_key, 1))
3552 debug_printf("skipping host %s because another Exim process "
3553 "is connected to it\n", host->name);
3560 /* OK, we have an IP address that is not waiting for its retry time to
3561 arrive (it might be expired) OR (second time round the loop) we have an
3562 expired host that hasn't been tried since the message arrived. Have a go
3563 at delivering the message to it. First prepare the addresses by flushing
3564 out the result of previous attempts, and finding the first address that
3565 is still to be delivered. */
3567 first_addr = prepare_addresses(addrlist, host);
3569 DEBUG(D_transport) debug_printf("delivering %s to %s [%s] (%s%s)\n",
3570 message_id, host->name, host->address, addrlist->address,
3571 (addrlist->next == NULL)? "" : ", ...");
3573 set_process_info("delivering %s to %s [%s] (%s%s)",
3574 message_id, host->name, host->address, addrlist->address,
3575 (addrlist->next == NULL)? "" : ", ...");
3577 /* This is not for real; don't do the delivery. If there are
3578 any remaining hosts, list them. */
3583 set_errno_nohost(addrlist, 0, NULL, OK, FALSE);
3584 for (addr = addrlist; addr != NULL; addr = addr->next)
3586 addr->host_used = host;
3587 addr->special_action = '*';
3588 addr->message = US"delivery bypassed by -N option";
3592 debug_printf("*** delivery by %s transport bypassed by -N option\n"
3593 "*** host and remaining hosts:\n", tblock->name);
3594 for (host2 = host; host2 != NULL; host2 = host2->next)
3595 debug_printf(" %s [%s]\n", host2->name,
3596 (host2->address == NULL)? US"unset" : host2->address);
3601 /* This is for real. If the host is expired, we don't count it for
3602 hosts_max_retry. This ensures that all hosts must expire before an address
3603 is timed out, unless hosts_max_try_hardlimit (which protects against
3604 lunatic DNS configurations) is reached.
3606 If the host is not expired and we are about to hit the hosts_max_retry
3607 limit, check to see if there is a subsequent hosts with a different MX
3608 value. If so, make that the next host, and don't count this one. This is a
3609 heuristic to make sure that different MXs do get tried. With a normal kind
3610 of retry rule, they would get tried anyway when the earlier hosts were
3611 delayed, but if the domain has a "retry every time" type of rule - as is
3612 often used for the the very large ISPs, that won't happen. */
3617 /* Make a copy of the host if it is local to this invocation
3618 of the transport. */
3622 thost = store_get(sizeof(host_item));
3624 thost->name = string_copy(host->name);
3625 thost->address = string_copy(host->address);
3630 if (!host_is_expired && ++unexpired_hosts_tried >= ob->hosts_max_try)
3634 debug_printf("hosts_max_try limit reached with this host\n");
3635 for (h = host; h; h = h->next) if (h->mx != host->mx)
3638 unexpired_hosts_tried--;
3639 DEBUG(D_transport) debug_printf("however, a higher MX host exists "
3640 "and will be tried\n");
3645 /* Attempt the delivery. */
3647 total_hosts_tried++;
3648 rc = smtp_deliver(addrlist, thost, host_af, port, interface, tblock,
3649 &message_defer, FALSE);
3652 OK => connection made, each address contains its result;
3653 message_defer is set for message-specific defers (when all
3654 recipients are marked defer)
3655 DEFER => there was a non-message-specific delivery problem;
3656 ERROR => there was a problem setting up the arguments for a filter,
3657 or there was a problem with expanding added headers
3660 /* If the result is not OK, there was a non-message-specific problem.
3661 If the result is DEFER, we need to write to the logs saying what happened
3662 for this particular host, except in the case of authentication and TLS
3663 failures, where the log has already been written. If all hosts defer a
3664 general message is written at the end. */
3666 if (rc == DEFER && first_addr->basic_errno != ERRNO_AUTHFAIL &&
3667 first_addr->basic_errno != ERRNO_TLSFAILURE)
3668 write_logs(first_addr, host);
3670 #ifndef DISABLE_EVENT
3672 deferred_event_raise(first_addr, host);
3675 /* If STARTTLS was accepted, but there was a failure in setting up the
3676 TLS session (usually a certificate screwup), and the host is not in
3677 hosts_require_tls, and tls_tempfail_tryclear is true, try again, with
3678 TLS forcibly turned off. We have to start from scratch with a new SMTP
3679 connection. That's why the retry is done from here, not from within
3680 smtp_deliver(). [Rejections of STARTTLS itself don't screw up the
3681 session, so the in-clear transmission after those errors, if permitted,
3682 happens inside smtp_deliver().] */
3686 && first_addr->basic_errno == ERRNO_TLSFAILURE
3687 && ob->tls_tempfail_tryclear
3688 && verify_check_given_host(&ob->hosts_require_tls, host) != OK
3691 log_write(0, LOG_MAIN, "TLS session failure: delivering unencrypted "
3692 "to %s [%s] (not in hosts_require_tls)", host->name, host->address);
3693 first_addr = prepare_addresses(addrlist, host);
3694 rc = smtp_deliver(addrlist, thost, host_af, port, interface, tblock,
3695 &message_defer, TRUE);
3696 if (rc == DEFER && first_addr->basic_errno != ERRNO_AUTHFAIL)
3697 write_logs(first_addr, host);
3698 # ifndef DISABLE_EVENT
3700 deferred_event_raise(first_addr, host);
3703 #endif /*SUPPORT_TLS*/
3706 /* Delivery attempt finished */
3708 rs = (rc == OK)? US"OK" : (rc == DEFER)? US"DEFER" : (rc == ERROR)?
3711 set_process_info("delivering %s: just tried %s [%s] for %s%s: result %s",
3712 message_id, host->name, host->address, addrlist->address,
3713 (addrlist->next == NULL)? "" : " (& others)", rs);
3715 /* Release serialization if set up */
3717 if (serialized) enq_end(serialize_key);
3719 /* If the result is DEFER, or if a host retry record is known to exist, we
3720 need to add an item to the retry chain for updating the retry database
3721 at the end of delivery. We only need to add the item to the top address,
3722 of course. Also, if DEFER, we mark the IP address unusable so as to skip it
3723 for any other delivery attempts using the same address. (It is copied into
3724 the unusable tree at the outer level, so even if different address blocks
3725 contain the same address, it still won't get tried again.) */
3727 if (rc == DEFER || retry_host_key != NULL)
3729 int delete_flag = (rc != DEFER)? rf_delete : 0;
3730 if (retry_host_key == NULL)
3733 if (exp_bool(addrlist, US"transport", tblock->name, D_transport,
3734 US"retry_include_ip_address", ob->retry_include_ip_address,
3735 ob->expand_retry_include_ip_address, &incl_ip) != OK)
3736 incl_ip = TRUE; /* error; use most-specific retry record */
3738 retry_host_key = incl_ip ?
3739 string_sprintf("T:%S:%s%s", host->name, host->address, pistring) :
3740 string_sprintf("T:%S%s", host->name, pistring);
3743 /* If a delivery of another message over an existing SMTP connection
3744 yields DEFER, we do NOT set up retry data for the host. This covers the
3745 case when there are delays in routing the addresses in the second message
3746 that are so long that the server times out. This is alleviated by not
3747 routing addresses that previously had routing defers when handling an
3748 existing connection, but even so, this case may occur (e.g. if a
3749 previously happily routed address starts giving routing defers). If the
3750 host is genuinely down, another non-continued message delivery will
3751 notice it soon enough. */
3753 if (delete_flag != 0 || !continuing)
3754 retry_add_item(first_addr, retry_host_key, rf_host | delete_flag);
3756 /* We may have tried an expired host, if its retry time has come; ensure
3757 the status reflects the expiry for the benefit of any other addresses. */
3761 host->status = (host_is_expired)?
3762 hstatus_unusable_expired : hstatus_unusable;
3763 host->why = hwhy_deferred;
3767 /* If message_defer is set (host was OK, but every recipient got deferred
3768 because of some message-specific problem), or if that had happened
3769 previously so that a message retry key exists, add an appropriate item
3770 to the retry chain. Note that if there was a message defer but now there is
3771 a host defer, the message defer record gets deleted. That seems perfectly
3772 reasonable. Also, stop the message from being remembered as waiting
3773 for specific hosts. */
3775 if (message_defer || retry_message_key != NULL)
3777 int delete_flag = message_defer? 0 : rf_delete;
3778 if (retry_message_key == NULL)
3781 if (exp_bool(addrlist, US"transport", tblock->name, D_transport,
3782 US"retry_include_ip_address", ob->retry_include_ip_address,
3783 ob->expand_retry_include_ip_address, &incl_ip) != OK)
3784 incl_ip = TRUE; /* error; use most-specific retry record */
3786 retry_message_key = incl_ip ?
3787 string_sprintf("T:%S:%s%s:%s", host->name, host->address, pistring,
3789 string_sprintf("T:%S%s:%s", host->name, pistring, message_id);
3791 retry_add_item(addrlist, retry_message_key,
3792 rf_message | rf_host | delete_flag);
3793 update_waiting = FALSE;
3796 /* Any return other than DEFER (that is, OK or ERROR) means that the
3797 addresses have got their final statuses filled in for this host. In the OK
3798 case, see if any of them are deferred. */
3801 for (addr = addrlist; addr; addr = addr->next)
3802 if (addr->transport_return == DEFER)
3804 some_deferred = TRUE;
3808 /* If no addresses deferred or the result was ERROR, return. We do this for
3809 ERROR because a failing filter set-up or add_headers expansion is likely to
3810 fail for any host we try. */
3812 if (rc == ERROR || (rc == OK && !some_deferred))
3814 DEBUG(D_transport) debug_printf("Leaving %s transport\n", tblock->name);
3815 return TRUE; /* Each address has its status */
3818 /* If the result was DEFER or some individual addresses deferred, let
3819 the loop run to try other hosts with the deferred addresses, except for the
3820 case when we were trying to deliver down an existing channel and failed.
3821 Don't try any other hosts in this case. */
3823 if (continuing) break;
3825 /* If the whole delivery, or some individual addresses, were deferred and
3826 there are more hosts that could be tried, do not count this host towards
3827 the hosts_max_try limit if the age of the message is greater than the
3828 maximum retry time for this host. This means we may try try all hosts,
3829 ignoring the limit, when messages have been around for some time. This is
3830 important because if we don't try all hosts, the address will never time
3831 out. NOTE: this does not apply to hosts_max_try_hardlimit. */
3833 if ((rc == DEFER || some_deferred) && nexthost != NULL)
3836 retry_config *retry = retry_find_config(host->name, NULL, 0, 0);
3838 if (retry != NULL && retry->rules != NULL)
3840 retry_rule *last_rule;
3841 for (last_rule = retry->rules;
3842 last_rule->next != NULL;
3843 last_rule = last_rule->next);
3844 timedout = time(NULL) - received_time > last_rule->timeout;
3846 else timedout = TRUE; /* No rule => timed out */
3850 unexpired_hosts_tried--;
3851 DEBUG(D_transport) debug_printf("temporary delivery error(s) override "
3852 "hosts_max_try (message older than host's retry time)\n");
3855 } /* End of loop for trying multiple hosts. */
3857 /* This is the end of the loop that repeats iff expired is TRUE and
3858 ob->delay_after_cutoff is FALSE. The second time round we will
3859 try those hosts that haven't been tried since the message arrived. */
3863 debug_printf("all IP addresses skipped or deferred at least one address\n");
3864 if (expired && !ob->delay_after_cutoff && cutoff_retry == 0)
3865 debug_printf("retrying IP addresses not tried since message arrived\n");
3870 /* Get here if all IP addresses are skipped or defer at least one address. In
3871 MUA wrapper mode, this will happen only for connection or other non-message-
3872 specific failures. Force the delivery status for all addresses to FAIL. */
3876 for (addr = addrlist; addr != NULL; addr = addr->next)
3877 addr->transport_return = FAIL;
3881 /* In the normal, non-wrapper case, add a standard message to each deferred
3882 address if there hasn't been an error, that is, if it hasn't actually been
3883 tried this time. The variable "expired" will be FALSE if any deliveries were
3884 actually tried, or if there was at least one host that was not expired. That
3885 is, it is TRUE only if no deliveries were tried and all hosts were expired. If
3886 a delivery has been tried, an error code will be set, and the failing of the
3887 message is handled by the retry code later.
3889 If queue_smtp is set, or this transport was called to send a subsequent message
3890 down an existing TCP/IP connection, and something caused the host not to be
3891 found, we end up here, but can detect these cases and handle them specially. */
3893 for (addr = addrlist; addr; addr = addr->next)
3895 /* If host is not NULL, it means that we stopped processing the host list
3896 because of hosts_max_try or hosts_max_try_hardlimit. In the former case, this
3897 means we need to behave as if some hosts were skipped because their retry
3898 time had not come. Specifically, this prevents the address from timing out.
3899 However, if we have hit hosts_max_try_hardlimit, we want to behave as if all
3900 hosts were tried. */
3903 if (total_hosts_tried >= ob->hosts_max_try_hardlimit)
3906 debug_printf("hosts_max_try_hardlimit reached: behave as if all "
3907 "hosts were tried\n");
3912 debug_printf("hosts_max_try limit caused some hosts to be skipped\n");
3913 setflag(addr, af_retry_skipped);
3916 if (queue_smtp) /* no deliveries attempted */
3918 addr->transport_return = DEFER;
3919 addr->basic_errno = 0;
3920 addr->message = US"SMTP delivery explicitly queued";
3923 else if ( addr->transport_return == DEFER
3924 && (addr->basic_errno == ERRNO_UNKNOWNERROR || addr->basic_errno == 0)
3928 addr->basic_errno = ERRNO_HRETRY;
3929 if (continue_hostname)
3930 addr->message = US"no host found for existing SMTP connection";
3933 setflag(addr, af_pass_message); /* This is not a security risk */
3934 addr->message = string_sprintf(
3935 "all hosts%s have been failing for a long time %s",
3936 addr->domain ? string_sprintf(" for '%s'", addr->domain) : US"",
3937 ob->delay_after_cutoff
3938 ? US"(and retry time not reached)"
3939 : US"and were last tried after this message arrived");
3941 /* If we are already using fallback hosts, or there are no fallback hosts
3942 defined, convert the result to FAIL to cause a bounce. */
3944 if (addr->host_list == addr->fallback_hosts || !addr->fallback_hosts)
3945 addr->transport_return = FAIL;
3950 if (hosts_retry == hosts_total)
3951 s = "retry time not reached for any host%s";
3952 else if (hosts_fail == hosts_total)
3953 s = "all host address lookups%s failed permanently";
3954 else if (hosts_defer == hosts_total)
3955 s = "all host address lookups%s failed temporarily";
3956 else if (hosts_serial == hosts_total)
3957 s = "connection limit reached for all hosts%s";
3958 else if (hosts_fail+hosts_defer == hosts_total)
3959 s = "all host address lookups%s failed";
3961 s = "some host address lookups failed and retry time "
3962 "not reached for other hosts or connection limit reached%s";
3964 addr->message = string_sprintf(s,
3965 addr->domain ? string_sprintf(" for '%s'", addr->domain) : US"");
3970 /* Update the database which keeps information about which messages are waiting
3971 for which hosts to become available. For some message-specific errors, the
3972 update_waiting flag is turned off because we don't want follow-on deliveries in
3973 those cases. If this transport instance is explicitly limited to one message
3974 per connection then follow-on deliveries are not possible and there's no need
3975 to create/update the per-transport wait-<transport_name> database. */
3977 if (update_waiting && tblock->connection_max_messages != 1)
3978 transport_update_waiting(hostlist, tblock->name);
3982 DEBUG(D_transport) debug_printf("Leaving %s transport\n", tblock->name);
3984 return TRUE; /* Each address has its status */
3989 /* End of transport/smtp.c */
git://git.exim.org / exim.git / blob