1 /*************************************************
2 * Exim - an Internet mail transport agent *
3 *************************************************/
5 /* Copyright (c) University of Cambridge 1995 - 2017 */
6 /* See the file NOTICE for conditions of use and distribution. */
12 /* Options specific to the smtp transport. This transport also supports LMTP
13 over TCP/IP. The options must be in alphabetic order (note that "_" comes
14 before the lower case letters). Some live in the transport_instance block so as
15 to be publicly visible; these are flagged with opt_public. */
17 optionlist smtp_transport_options[] = {
18 { "*expand_multi_domain", opt_stringptr | opt_hidden | opt_public,
19 (void *)offsetof(transport_instance, expand_multi_domain) },
20 { "*expand_retry_include_ip_address", opt_stringptr | opt_hidden,
21 (void *)(offsetof(smtp_transport_options_block, expand_retry_include_ip_address)) },
23 { "address_retry_include_sender", opt_bool,
24 (void *)offsetof(smtp_transport_options_block, address_retry_include_sender) },
25 { "allow_localhost", opt_bool,
26 (void *)offsetof(smtp_transport_options_block, allow_localhost) },
27 { "authenticated_sender", opt_stringptr,
28 (void *)offsetof(smtp_transport_options_block, authenticated_sender) },
29 { "authenticated_sender_force", opt_bool,
30 (void *)offsetof(smtp_transport_options_block, authenticated_sender_force) },
31 { "command_timeout", opt_time,
32 (void *)offsetof(smtp_transport_options_block, command_timeout) },
33 { "connect_timeout", opt_time,
34 (void *)offsetof(smtp_transport_options_block, connect_timeout) },
35 { "connection_max_messages", opt_int | opt_public,
36 (void *)offsetof(transport_instance, connection_max_messages) },
37 { "data_timeout", opt_time,
38 (void *)offsetof(smtp_transport_options_block, data_timeout) },
39 { "delay_after_cutoff", opt_bool,
40 (void *)offsetof(smtp_transport_options_block, delay_after_cutoff) },
42 { "dkim_canon", opt_stringptr,
43 (void *)offsetof(smtp_transport_options_block, dkim.dkim_canon) },
44 { "dkim_domain", opt_stringptr,
45 (void *)offsetof(smtp_transport_options_block, dkim.dkim_domain) },
46 { "dkim_private_key", opt_stringptr,
47 (void *)offsetof(smtp_transport_options_block, dkim.dkim_private_key) },
48 { "dkim_selector", opt_stringptr,
49 (void *)offsetof(smtp_transport_options_block, dkim.dkim_selector) },
50 { "dkim_sign_headers", opt_stringptr,
51 (void *)offsetof(smtp_transport_options_block, dkim.dkim_sign_headers) },
52 { "dkim_strict", opt_stringptr,
53 (void *)offsetof(smtp_transport_options_block, dkim.dkim_strict) },
55 { "dns_qualify_single", opt_bool,
56 (void *)offsetof(smtp_transport_options_block, dns_qualify_single) },
57 { "dns_search_parents", opt_bool,
58 (void *)offsetof(smtp_transport_options_block, dns_search_parents) },
59 { "dnssec_request_domains", opt_stringptr,
60 (void *)offsetof(smtp_transport_options_block, dnssec.request) },
61 { "dnssec_require_domains", opt_stringptr,
62 (void *)offsetof(smtp_transport_options_block, dnssec.require) },
63 { "dscp", opt_stringptr,
64 (void *)offsetof(smtp_transport_options_block, dscp) },
65 { "fallback_hosts", opt_stringptr,
66 (void *)offsetof(smtp_transport_options_block, fallback_hosts) },
67 { "final_timeout", opt_time,
68 (void *)offsetof(smtp_transport_options_block, final_timeout) },
69 { "gethostbyname", opt_bool,
70 (void *)offsetof(smtp_transport_options_block, gethostbyname) },
71 { "helo_data", opt_stringptr,
72 (void *)offsetof(smtp_transport_options_block, helo_data) },
73 { "hosts", opt_stringptr,
74 (void *)offsetof(smtp_transport_options_block, hosts) },
75 { "hosts_avoid_esmtp", opt_stringptr,
76 (void *)offsetof(smtp_transport_options_block, hosts_avoid_esmtp) },
77 { "hosts_avoid_pipelining", opt_stringptr,
78 (void *)offsetof(smtp_transport_options_block, hosts_avoid_pipelining) },
80 { "hosts_avoid_tls", opt_stringptr,
81 (void *)offsetof(smtp_transport_options_block, hosts_avoid_tls) },
83 { "hosts_max_try", opt_int,
84 (void *)offsetof(smtp_transport_options_block, hosts_max_try) },
85 { "hosts_max_try_hardlimit", opt_int,
86 (void *)offsetof(smtp_transport_options_block, hosts_max_try_hardlimit) },
88 { "hosts_nopass_tls", opt_stringptr,
89 (void *)offsetof(smtp_transport_options_block, hosts_nopass_tls) },
90 { "hosts_noproxy_tls", opt_stringptr,
91 (void *)offsetof(smtp_transport_options_block, hosts_noproxy_tls) },
93 { "hosts_override", opt_bool,
94 (void *)offsetof(smtp_transport_options_block, hosts_override) },
95 { "hosts_randomize", opt_bool,
96 (void *)offsetof(smtp_transport_options_block, hosts_randomize) },
97 #if defined(SUPPORT_TLS) && !defined(DISABLE_OCSP)
98 { "hosts_request_ocsp", opt_stringptr,
99 (void *)offsetof(smtp_transport_options_block, hosts_request_ocsp) },
101 { "hosts_require_auth", opt_stringptr,
102 (void *)offsetof(smtp_transport_options_block, hosts_require_auth) },
104 # ifdef EXPERIMENTAL_DANE
105 { "hosts_require_dane", opt_stringptr,
106 (void *)offsetof(smtp_transport_options_block, hosts_require_dane) },
108 # ifndef DISABLE_OCSP
109 { "hosts_require_ocsp", opt_stringptr,
110 (void *)offsetof(smtp_transport_options_block, hosts_require_ocsp) },
112 { "hosts_require_tls", opt_stringptr,
113 (void *)offsetof(smtp_transport_options_block, hosts_require_tls) },
115 { "hosts_try_auth", opt_stringptr,
116 (void *)offsetof(smtp_transport_options_block, hosts_try_auth) },
117 { "hosts_try_chunking", opt_stringptr,
118 (void *)offsetof(smtp_transport_options_block, hosts_try_chunking) },
119 #if defined(SUPPORT_TLS) && defined(EXPERIMENTAL_DANE)
120 { "hosts_try_dane", opt_stringptr,
121 (void *)offsetof(smtp_transport_options_block, hosts_try_dane) },
123 { "hosts_try_fastopen", opt_stringptr,
124 (void *)offsetof(smtp_transport_options_block, hosts_try_fastopen) },
126 { "hosts_try_prdr", opt_stringptr,
127 (void *)offsetof(smtp_transport_options_block, hosts_try_prdr) },
130 { "hosts_verify_avoid_tls", opt_stringptr,
131 (void *)offsetof(smtp_transport_options_block, hosts_verify_avoid_tls) },
133 { "interface", opt_stringptr,
134 (void *)offsetof(smtp_transport_options_block, interface) },
135 { "keepalive", opt_bool,
136 (void *)offsetof(smtp_transport_options_block, keepalive) },
137 { "lmtp_ignore_quota", opt_bool,
138 (void *)offsetof(smtp_transport_options_block, lmtp_ignore_quota) },
139 { "max_rcpt", opt_int | opt_public,
140 (void *)offsetof(transport_instance, max_addresses) },
141 { "multi_domain", opt_expand_bool | opt_public,
142 (void *)offsetof(transport_instance, multi_domain) },
143 { "port", opt_stringptr,
144 (void *)offsetof(smtp_transport_options_block, port) },
145 { "protocol", opt_stringptr,
146 (void *)offsetof(smtp_transport_options_block, protocol) },
147 { "retry_include_ip_address", opt_expand_bool,
148 (void *)offsetof(smtp_transport_options_block, retry_include_ip_address) },
149 { "serialize_hosts", opt_stringptr,
150 (void *)offsetof(smtp_transport_options_block, serialize_hosts) },
151 { "size_addition", opt_int,
152 (void *)offsetof(smtp_transport_options_block, size_addition) }
154 ,{ "socks_proxy", opt_stringptr,
155 (void *)offsetof(smtp_transport_options_block, socks_proxy) }
158 ,{ "tls_certificate", opt_stringptr,
159 (void *)offsetof(smtp_transport_options_block, tls_certificate) },
160 { "tls_crl", opt_stringptr,
161 (void *)offsetof(smtp_transport_options_block, tls_crl) },
162 { "tls_dh_min_bits", opt_int,
163 (void *)offsetof(smtp_transport_options_block, tls_dh_min_bits) },
164 { "tls_privatekey", opt_stringptr,
165 (void *)offsetof(smtp_transport_options_block, tls_privatekey) },
166 { "tls_require_ciphers", opt_stringptr,
167 (void *)offsetof(smtp_transport_options_block, tls_require_ciphers) },
168 { "tls_sni", opt_stringptr,
169 (void *)offsetof(smtp_transport_options_block, tls_sni) },
170 { "tls_tempfail_tryclear", opt_bool,
171 (void *)offsetof(smtp_transport_options_block, tls_tempfail_tryclear) },
172 { "tls_try_verify_hosts", opt_stringptr,
173 (void *)offsetof(smtp_transport_options_block, tls_try_verify_hosts) },
174 { "tls_verify_cert_hostnames", opt_stringptr,
175 (void *)offsetof(smtp_transport_options_block,tls_verify_cert_hostnames)},
176 { "tls_verify_certificates", opt_stringptr,
177 (void *)offsetof(smtp_transport_options_block, tls_verify_certificates) },
178 { "tls_verify_hosts", opt_stringptr,
179 (void *)offsetof(smtp_transport_options_block, tls_verify_hosts) }
183 /* Size of the options list. An extern variable has to be used so that its
184 address can appear in the tables drtables.c. */
186 int smtp_transport_options_count =
187 sizeof(smtp_transport_options)/sizeof(optionlist);
189 /* Default private options block for the smtp transport. */
191 smtp_transport_options_block smtp_transport_option_defaults = {
193 NULL, /* fallback_hosts */
195 NULL, /* fallback_hostlist */
196 NULL, /* authenticated_sender */
197 US"$primary_hostname", /* helo_data */
198 NULL, /* interface */
200 US"smtp", /* protocol */
202 NULL, /* serialize_hosts */
203 NULL, /* hosts_try_auth */
204 NULL, /* hosts_require_auth */
205 US"*", /* hosts_try_chunking */
206 #ifdef EXPERIMENTAL_DANE
207 NULL, /* hosts_try_dane */
208 NULL, /* hosts_require_dane */
210 NULL, /* hosts_try_fastopen */
212 US"*", /* hosts_try_prdr */
215 US"*", /* hosts_request_ocsp (except under DANE; tls_client_start()) */
216 NULL, /* hosts_require_ocsp */
218 NULL, /* hosts_require_tls */
219 NULL, /* hosts_avoid_tls */
220 NULL, /* hosts_verify_avoid_tls */
221 NULL, /* hosts_avoid_pipelining */
222 NULL, /* hosts_avoid_esmtp */
224 NULL, /* hosts_nopass_tls */
225 US"*", /* hosts_noproxy_tls */
227 5*60, /* command_timeout */
228 5*60, /* connect_timeout; shorter system default overrides */
229 5*60, /* data timeout */
230 10*60, /* final timeout */
231 1024, /* size_addition */
232 5, /* hosts_max_try */
233 50, /* hosts_max_try_hardlimit */
234 TRUE, /* address_retry_include_sender */
235 FALSE, /* allow_localhost */
236 FALSE, /* authenticated_sender_force */
237 FALSE, /* gethostbyname */
238 TRUE, /* dns_qualify_single */
239 FALSE, /* dns_search_parents */
240 { NULL, NULL }, /* dnssec_domains {request,require} */
241 TRUE, /* delay_after_cutoff */
242 FALSE, /* hosts_override */
243 FALSE, /* hosts_randomize */
244 TRUE, /* keepalive */
245 FALSE, /* lmtp_ignore_quota */
246 NULL, /* expand_retry_include_ip_address */
247 TRUE /* retry_include_ip_address */
249 ,NULL /* socks_proxy */
252 ,NULL, /* tls_certificate */
254 NULL, /* tls_privatekey */
255 NULL, /* tls_require_ciphers */
257 US"system", /* tls_verify_certificates */
258 EXIM_CLIENT_DH_DEFAULT_MIN_BITS,
259 /* tls_dh_min_bits */
260 TRUE, /* tls_tempfail_tryclear */
261 NULL, /* tls_verify_hosts */
262 US"*", /* tls_try_verify_hosts */
263 US"*" /* tls_verify_cert_hostnames */
266 , {NULL, /* dkim_canon */
267 NULL, /* dkim_domain */
268 NULL, /* dkim_private_key */
269 NULL, /* dkim_selector */
270 NULL, /* dkim_sign_headers */
271 NULL, /* dkim_strict */
272 FALSE} /* dot_stuffed */
276 /* some DSN flags for use later */
278 static int rf_list[] = {rf_notify_never, rf_notify_success,
279 rf_notify_failure, rf_notify_delay };
281 static uschar *rf_names[] = { US"NEVER", US"SUCCESS", US"FAILURE", US"DELAY" };
287 static uschar *smtp_command; /* Points to last cmd for error messages */
288 static uschar *mail_command; /* Points to MAIL cmd for error messages */
289 static uschar *data_command = US""; /* Points to DATA cmd for error messages */
290 static BOOL update_waiting; /* TRUE to update the "wait" database */
292 /*XXX move to smtp_context */
293 static BOOL pipelining_active; /* current transaction is in pipe mode */
296 /*************************************************
297 * Setup entry point *
298 *************************************************/
300 /* This function is called when the transport is about to be used,
301 but before running it in a sub-process. It is used for two things:
303 (1) To set the fallback host list in addresses, when delivering.
304 (2) To pass back the interface, port, protocol, and other options, for use
305 during callout verification.
308 tblock pointer to the transport instance block
309 addrlist list of addresses about to be transported
310 tf if not NULL, pointer to block in which to return options
311 uid the uid that will be set (not used)
312 gid the gid that will be set (not used)
313 errmsg place for error message (not used)
315 Returns: OK always (FAIL, DEFER not used)
319 smtp_transport_setup(transport_instance *tblock, address_item *addrlist,
320 transport_feedback *tf, uid_t uid, gid_t gid, uschar **errmsg)
322 smtp_transport_options_block *ob =
323 (smtp_transport_options_block *)(tblock->options_block);
325 errmsg = errmsg; /* Keep picky compilers happy */
329 /* Pass back options if required. This interface is getting very messy. */
333 tf->interface = ob->interface;
335 tf->protocol = ob->protocol;
336 tf->hosts = ob->hosts;
337 tf->hosts_override = ob->hosts_override;
338 tf->hosts_randomize = ob->hosts_randomize;
339 tf->gethostbyname = ob->gethostbyname;
340 tf->qualify_single = ob->dns_qualify_single;
341 tf->search_parents = ob->dns_search_parents;
342 tf->helo_data = ob->helo_data;
345 /* Set the fallback host list for all the addresses that don't have fallback
346 host lists, provided that the local host wasn't present in the original host
349 if (!testflag(addrlist, af_local_host_removed))
350 for (; addrlist; addrlist = addrlist->next)
351 if (!addrlist->fallback_hosts) addrlist->fallback_hosts = ob->fallback_hostlist;
358 /*************************************************
359 * Initialization entry point *
360 *************************************************/
362 /* Called for each instance, after its options have been read, to
363 enable consistency checks to be done, or anything else that needs
366 Argument: pointer to the transport instance block
371 smtp_transport_init(transport_instance *tblock)
373 smtp_transport_options_block *ob =
374 (smtp_transport_options_block *)(tblock->options_block);
376 /* Retry_use_local_part defaults FALSE if unset */
378 if (tblock->retry_use_local_part == TRUE_UNSET)
379 tblock->retry_use_local_part = FALSE;
381 /* Set the default port according to the protocol */
383 if (ob->port == NULL)
384 ob->port = (strcmpic(ob->protocol, US"lmtp") == 0)? US"lmtp" :
385 (strcmpic(ob->protocol, US"smtps") == 0)? US"smtps" : US"smtp";
387 /* Set up the setup entry point, to be called before subprocesses for this
390 tblock->setup = smtp_transport_setup;
392 /* Complain if any of the timeouts are zero. */
394 if (ob->command_timeout <= 0 || ob->data_timeout <= 0 ||
395 ob->final_timeout <= 0)
396 log_write(0, LOG_PANIC_DIE|LOG_CONFIG,
397 "command, data, or final timeout value is zero for %s transport",
400 /* If hosts_override is set and there are local hosts, set the global
401 flag that stops verify from showing router hosts. */
403 if (ob->hosts_override && ob->hosts != NULL) tblock->overrides_hosts = TRUE;
405 /* If there are any fallback hosts listed, build a chain of host items
406 for them, but do not do any lookups at this time. */
408 host_build_hostlist(&(ob->fallback_hostlist), ob->fallback_hosts, FALSE);
415 /*************************************************
416 * Set delivery info into all active addresses *
417 *************************************************/
419 /* Only addresses whose status is >= PENDING are relevant. A lesser
420 status means that an address is not currently being processed.
423 addrlist points to a chain of addresses
424 errno_value to put in each address's errno field
425 msg to put in each address's message field
426 rc to put in each address's transport_return field
427 pass_message if TRUE, set the "pass message" flag in the address
428 host if set, mark addrs as having used this host
429 smtp_greeting from peer
430 helo_response from peer
432 If errno_value has the special value ERRNO_CONNECTTIMEOUT, ETIMEDOUT is put in
433 the errno field, and RTEF_CTOUT is ORed into the more_errno field, to indicate
434 this particular type of timeout.
440 set_errno(address_item *addrlist, int errno_value, uschar *msg, int rc,
441 BOOL pass_message, host_item * host
442 #ifdef EXPERIMENTAL_DSN_INFO
443 , const uschar * smtp_greeting, const uschar * helo_response
449 if (errno_value == ERRNO_CONNECTTIMEOUT)
451 errno_value = ETIMEDOUT;
452 orvalue = RTEF_CTOUT;
454 for (addr = addrlist; addr; addr = addr->next)
455 if (addr->transport_return >= PENDING)
457 addr->basic_errno = errno_value;
458 addr->more_errno |= orvalue;
462 if (pass_message) setflag(addr, af_pass_message);
464 addr->transport_return = rc;
467 addr->host_used = host;
468 #ifdef EXPERIMENTAL_DSN_INFO
470 {uschar * s = Ustrchr(smtp_greeting, '\n'); if (s) *s = '\0';}
471 addr->smtp_greeting = smtp_greeting;
474 {uschar * s = Ustrchr(helo_response, '\n'); if (s) *s = '\0';}
475 addr->helo_response = helo_response;
482 set_errno_nohost(address_item *addrlist, int errno_value, uschar *msg, int rc,
485 set_errno(addrlist, errno_value, msg, rc, pass_message, NULL
486 #ifdef EXPERIMENTAL_DSN_INFO
493 /*************************************************
494 * Check an SMTP response *
495 *************************************************/
497 /* This function is given an errno code and the SMTP response buffer
498 to analyse, together with the host identification for generating messages. It
499 sets an appropriate message and puts the first digit of the response code into
500 the yield variable. If no response was actually read, a suitable digit is
504 host the current host, to get its name for messages
505 errno_value pointer to the errno value
506 more_errno from the top address for use with ERRNO_FILTER_FAIL
507 buffer the SMTP response buffer
508 yield where to put a one-digit SMTP response code
509 message where to put an error message
510 pass_message set TRUE if message is an SMTP response
512 Returns: TRUE if an SMTP "QUIT" command should be sent, else FALSE
516 check_response(host_item *host, int *errno_value, int more_errno,
517 uschar *buffer, int *yield, uschar **message, BOOL *pass_message)
519 uschar * pl = pipelining_active ? US"pipelined " : US"";
522 *yield = '4'; /* Default setting is to give a temporary error */
526 case ETIMEDOUT: /* Handle response timeout */
527 *message = US string_sprintf("SMTP timeout after %s%s",
529 if (transport_count > 0)
530 *message = US string_sprintf("%s (%d bytes written)", *message,
534 case ERRNO_SMTPFORMAT: /* Handle malformed SMTP response */
535 s = string_printing(buffer);
536 while (isspace(*s)) s++;
538 ? string_sprintf("Malformed SMTP reply (an empty line) "
539 "in response to %s%s", pl, smtp_command)
540 : string_sprintf("Malformed SMTP reply in response to %s%s: %s",
541 pl, smtp_command, s);
544 case ERRNO_FILTER_FAIL: /* Handle a failed filter process error;
545 can't send QUIT as we mustn't end the DATA. */
546 *message = string_sprintf("transport filter process failed (%d)%s",
548 more_errno == EX_EXECFAILED ? ": unable to execute command" : "");
551 case ERRNO_CHHEADER_FAIL: /* Handle a failed add_headers expansion;
552 can't send QUIT as we mustn't end the DATA. */
554 string_sprintf("failed to expand headers_add or headers_remove: %s",
555 expand_string_message);
558 case ERRNO_WRITEINCOMPLETE: /* failure to write a complete data block */
559 *message = string_sprintf("failed to write a data block");
563 case ERRNO_UTF8_FWD: /* no advertised SMTPUTF8, for international message */
564 *message = US"utf8 support required but not offered for forwarding";
565 DEBUG(D_deliver|D_transport) debug_printf("%s\n", *message);
570 /* Handle error responses from the remote mailer. */
574 *message = string_sprintf("SMTP error from remote mail server after %s%s: "
575 "%s", pl, smtp_command, s = string_printing(buffer));
576 *pass_message = TRUE;
581 /* No data was read. If there is no errno, this must be the EOF (i.e.
582 connection closed) case, which causes deferral. An explicit connection reset
583 error has the same effect. Otherwise, put the host's identity in the message,
584 leaving the errno value to be interpreted as well. In all cases, we have to
585 assume the connection is now dead. */
587 if (*errno_value == 0 || *errno_value == ECONNRESET)
589 *errno_value = ERRNO_SMTPCLOSED;
590 *message = US string_sprintf("Remote host closed connection "
591 "in response to %s%s", pl, smtp_command);
594 *message = US string_sprintf("%s [%s]", host->name, host->address);
601 /*************************************************
602 * Write error message to logs *
603 *************************************************/
605 /* This writes to the main log and to the message log.
608 addr the address item containing error information
609 host the current host
615 write_logs(address_item *addr, host_item *host)
617 uschar * message = LOGGING(outgoing_port)
618 ? string_sprintf("H=%s [%s]:%d", host->name, host->address,
619 host->port == PORT_NONE ? 25 : host->port)
620 : string_sprintf("H=%s [%s]", host->name, host->address);
624 message = string_sprintf("%s: %s", message, addr->message);
625 if (addr->basic_errno > 0)
626 message = string_sprintf("%s: %s", message, strerror(addr->basic_errno));
627 log_write(0, LOG_MAIN, "%s", message);
628 deliver_msglog("%s %s\n", tod_stamp(tod_log), message);
632 const uschar * s = exim_errstr(addr->basic_errno);
633 log_write(0, LOG_MAIN, "%s %s", message, s);
634 deliver_msglog("%s %s %s\n", tod_stamp(tod_log), message, s);
639 msglog_line(host_item * host, uschar * message)
641 deliver_msglog("%s H=%s [%s] %s\n", tod_stamp(tod_log),
642 host->name, host->address, message);
647 #ifndef DISABLE_EVENT
648 /*************************************************
649 * Post-defer action *
650 *************************************************/
652 /* This expands an arbitrary per-transport string.
653 It might, for example, be used to write to the database log.
656 addr the address item containing error information
657 host the current host
663 deferred_event_raise(address_item *addr, host_item *host)
665 uschar * action = addr->transport->event_action;
666 const uschar * save_domain;
672 save_domain = deliver_domain;
673 save_local = deliver_localpart;
675 /*XXX would ip & port already be set up? */
676 deliver_host_address = string_copy(host->address);
677 deliver_host_port = host->port == PORT_NONE ? 25 : host->port;
678 event_defer_errno = addr->basic_errno;
680 router_name = addr->router->name;
681 transport_name = addr->transport->name;
682 deliver_domain = addr->domain;
683 deliver_localpart = addr->local_part;
685 (void) event_raise(action, US"msg:host:defer",
687 ? addr->basic_errno > 0
688 ? string_sprintf("%s: %s", addr->message, strerror(addr->basic_errno))
689 : string_copy(addr->message)
690 : addr->basic_errno > 0
691 ? string_copy(US strerror(addr->basic_errno))
694 deliver_localpart = save_local;
695 deliver_domain = save_domain;
696 router_name = transport_name = NULL;
700 /*************************************************
701 * Synchronize SMTP responses *
702 *************************************************/
704 /* This function is called from smtp_deliver() to receive SMTP responses from
705 the server, and match them up with the commands to which they relate. When
706 PIPELINING is not in use, this function is called after every command, and is
707 therefore somewhat over-engineered, but it is simpler to use a single scheme
708 that works both with and without PIPELINING instead of having two separate sets
711 The set of commands that are buffered up with pipelining may start with MAIL
712 and may end with DATA; in between are RCPT commands that correspond to the
713 addresses whose status is PENDING_DEFER. All other commands (STARTTLS, AUTH,
714 etc.) are never buffered.
716 Errors after MAIL or DATA abort the whole process leaving the response in the
717 buffer. After MAIL, pending responses are flushed, and the original command is
718 re-instated in big_buffer for error messages. For RCPT commands, the remote is
719 permitted to reject some recipient addresses while accepting others. However
720 certain errors clearly abort the whole process. Set the value in
721 transport_return to PENDING_OK if the address is accepted. If there is a
722 subsequent general error, it will get reset accordingly. If not, it will get
723 converted to OK at the end.
726 sx smtp connection context
727 count the number of responses to read
728 pending_DATA 0 if last command sent was not DATA
729 +1 if previously had a good recipient
730 -1 if not previously had a good recipient
732 Returns: 3 if at least one address had 2xx and one had 5xx
733 2 if at least one address had 5xx but none had 2xx
734 1 if at least one host had a 2xx response, but none had 5xx
735 0 no address had 2xx or 5xx but no errors (all 4xx, or just DATA)
736 -1 timeout while reading RCPT response
737 -2 I/O or other non-response error for RCPT
738 -3 DATA or MAIL failed - errno and buffer set
742 sync_responses(smtp_context * sx, int count, int pending_DATA)
744 address_item *addr = sx->sync_addr;
745 smtp_transport_options_block *ob =
746 (smtp_transport_options_block *)sx->tblock->options_block;
749 /* Handle the response for a MAIL command. On error, reinstate the original
750 command in big_buffer for error message use, and flush any further pending
751 responses before returning, except after I/O errors and timeouts. */
753 if (sx->pending_MAIL)
756 if (!smtp_read_response(&sx->inblock, sx->buffer, sizeof(sx->buffer),
757 '2', ob->command_timeout))
759 DEBUG(D_transport) debug_printf("bad response for MAIL\n");
760 Ustrcpy(big_buffer, mail_command); /* Fits, because it came from there! */
761 if (errno == 0 && sx->buffer[0] != 0)
763 uschar flushbuffer[4096];
765 if (sx->buffer[0] == '4')
767 save_errno = ERRNO_MAIL4XX;
768 addr->more_errno |= ((sx->buffer[1] - '0')*10 + sx->buffer[2] - '0') << 8;
772 if (!smtp_read_response(&sx->inblock, flushbuffer, sizeof(flushbuffer),
773 '2', ob->command_timeout)
774 && (errno != 0 || flushbuffer[0] == 0))
780 if (pending_DATA) count--; /* Number of RCPT responses to come */
781 while (count-- > 0) /* Mark any pending addrs with the host used */
783 while (addr->transport_return != PENDING_DEFER) addr = addr->next;
784 addr->host_used = sx->host;
791 if (pending_DATA) count--; /* Number of RCPT responses to come */
793 /* Read and handle the required number of RCPT responses, matching each one up
794 with an address by scanning for the next address whose status is PENDING_DEFER.
799 while (addr->transport_return != PENDING_DEFER)
800 if (!(addr = addr->next))
803 /* The address was accepted */
804 addr->host_used = sx->host;
806 if (smtp_read_response(&sx->inblock, sx->buffer, sizeof(sx->buffer),
807 '2', ob->command_timeout))
810 addr->transport_return = PENDING_OK;
812 /* If af_dr_retry_exists is set, there was a routing delay on this address;
813 ensure that any address-specific retry record is expunged. We do this both
814 for the basic key and for the version that also includes the sender. */
816 if (testflag(addr, af_dr_retry_exists))
818 uschar *altkey = string_sprintf("%s:<%s>", addr->address_retry_key,
820 retry_add_item(addr, altkey, rf_delete);
821 retry_add_item(addr, addr->address_retry_key, rf_delete);
825 /* Timeout while reading the response */
827 else if (errno == ETIMEDOUT)
829 uschar *message = string_sprintf("SMTP timeout after RCPT TO:<%s>",
830 transport_rcpt_address(addr, sx->tblock->rcpt_include_affixes));
831 set_errno_nohost(sx->first_addr, ETIMEDOUT, message, DEFER, FALSE);
832 retry_add_item(addr, addr->address_retry_key, 0);
833 update_waiting = FALSE;
837 /* Handle other errors in obtaining an SMTP response by returning -1. This
838 will cause all the addresses to be deferred. Restore the SMTP command in
839 big_buffer for which we are checking the response, so the error message
842 else if (errno != 0 || sx->buffer[0] == 0)
844 string_format(big_buffer, big_buffer_size, "RCPT TO:<%s>",
845 transport_rcpt_address(addr, sx->tblock->rcpt_include_affixes));
849 /* Handle SMTP permanent and temporary response codes. */
854 string_sprintf("SMTP error from remote mail server after RCPT TO:<%s>: "
855 "%s", transport_rcpt_address(addr, sx->tblock->rcpt_include_affixes),
856 string_printing(sx->buffer));
857 setflag(addr, af_pass_message);
859 msglog_line(sx->host, addr->message);
861 /* The response was 5xx */
863 if (sx->buffer[0] == '5')
865 addr->transport_return = FAIL;
869 /* The response was 4xx */
873 addr->transport_return = DEFER;
874 addr->basic_errno = ERRNO_RCPT4XX;
875 addr->more_errno |= ((sx->buffer[1] - '0')*10 + sx->buffer[2] - '0') << 8;
879 #ifndef DISABLE_EVENT
880 event_defer_errno = addr->more_errno;
881 msg_event_raise(US"msg:rcpt:host:defer", addr);
884 /* Log temporary errors if there are more hosts to be tried.
885 If not, log this last one in the == line. */
888 log_write(0, LOG_MAIN, "H=%s [%s]: %s",
889 sx->host->name, sx->host->address, addr->message);
891 #ifndef DISABLE_EVENT
893 msg_event_raise(US"msg:rcpt:defer", addr);
896 /* Do not put this message on the list of those waiting for specific
897 hosts, as otherwise it is likely to be tried too often. */
899 update_waiting = FALSE;
901 /* Add a retry item for the address so that it doesn't get tried again
902 too soon. If address_retry_include_sender is true, add the sender address
906 ob->address_retry_include_sender
907 ? string_sprintf("%s:<%s>", addr->address_retry_key, sender_address)
908 : addr->address_retry_key,
913 } /* Loop for next RCPT response */
915 /* Update where to start at for the next block of responses, unless we
916 have already handled all the addresses. */
918 if (addr) sx->sync_addr = addr->next;
920 /* Handle a response to DATA. If we have not had any good recipients, either
921 previously or in this block, the response is ignored. */
923 if (pending_DATA != 0 &&
924 !smtp_read_response(&sx->inblock, sx->buffer, sizeof(sx->buffer),
925 '3', ob->command_timeout))
930 if (pending_DATA > 0 || (yield & 1) != 0)
932 if (errno == 0 && sx->buffer[0] == '4')
934 errno = ERRNO_DATA4XX;
935 sx->first_addr->more_errno |= ((sx->buffer[1] - '0')*10 + sx->buffer[2] - '0') << 8;
939 (void)check_response(sx->host, &errno, 0, sx->buffer, &code, &msg, &pass_message);
940 DEBUG(D_transport) debug_printf("%s\nerror for DATA ignored: pipelining "
941 "is in use and there were no good recipients\n", msg);
944 /* All responses read and handled; MAIL (if present) received 2xx and DATA (if
945 present) received 3xx. If any RCPTs were handled and yielded anything other
946 than 4xx, yield will be set non-zero. */
953 /* Do the client side of smtp-level authentication */
956 buffer EHLO response from server (gets overwritten)
957 addrlist chain of potential addresses to deliver
958 host host to deliver to
960 ibp, obp comms channel control blocks
963 OK Success, or failed (but not required): global "smtp_authenticated" set
964 DEFER Failed authentication (and was required)
965 ERROR Internal problem
967 FAIL_SEND Failed communications - transmit
972 smtp_auth(uschar *buffer, unsigned bufsize, address_item *addrlist, host_item *host,
973 smtp_transport_options_block *ob, BOOL is_esmtp,
974 smtp_inblock *ibp, smtp_outblock *obp)
977 uschar *fail_reason = US"server did not advertise AUTH support";
979 smtp_authenticated = FALSE;
980 client_authenticator = client_authenticated_id = client_authenticated_sender = NULL;
981 require_auth = verify_check_given_host(&ob->hosts_require_auth, host);
983 if (is_esmtp && !regex_AUTH) regex_AUTH =
984 regex_must_compile(US"\\n250[\\s\\-]AUTH\\s+([\\-\\w\\s]+)(?:\\n|$)",
987 if (is_esmtp && regex_match_and_setup(regex_AUTH, buffer, 0, -1))
989 uschar *names = string_copyn(expand_nstring[1], expand_nlength[1]);
990 expand_nmax = -1; /* reset */
992 /* Must not do this check until after we have saved the result of the
993 regex match above. */
995 if (require_auth == OK ||
996 verify_check_given_host(&ob->hosts_try_auth, host) == OK)
999 fail_reason = US"no common mechanisms were found";
1001 DEBUG(D_transport) debug_printf("scanning authentication mechanisms\n");
1003 /* Scan the configured authenticators looking for one which is configured
1004 for use as a client, which is not suppressed by client_condition, and
1005 whose name matches an authentication mechanism supported by the server.
1006 If one is found, attempt to authenticate by calling its client function.
1009 for (au = auths; !smtp_authenticated && au != NULL; au = au->next)
1013 (au->client_condition != NULL &&
1014 !expand_check_condition(au->client_condition, au->name,
1015 US"client authenticator")))
1017 DEBUG(D_transport) debug_printf("skipping %s authenticator: %s\n",
1019 (au->client)? "client_condition is false" :
1020 "not configured as a client");
1024 /* Loop to scan supported server mechanisms */
1029 int len = Ustrlen(au->public_name);
1030 while (isspace(*p)) p++;
1032 if (strncmpic(au->public_name, p, len) != 0 ||
1033 (p[len] != 0 && !isspace(p[len])))
1035 while (*p != 0 && !isspace(*p)) p++;
1039 /* Found data for a listed mechanism. Call its client entry. Set
1040 a flag in the outblock so that data is overwritten after sending so
1041 that reflections don't show it. */
1043 fail_reason = US"authentication attempt(s) failed";
1044 obp->authenticating = TRUE;
1045 rc = (au->info->clientcode)(au, ibp, obp,
1046 ob->command_timeout, buffer, bufsize);
1047 obp->authenticating = FALSE;
1048 DEBUG(D_transport) debug_printf("%s authenticator yielded %d\n",
1051 /* A temporary authentication failure must hold up delivery to
1052 this host. After a permanent authentication failure, we carry on
1053 to try other authentication methods. If all fail hard, try to
1054 deliver the message unauthenticated unless require_auth was set. */
1059 smtp_authenticated = TRUE; /* stops the outer loop */
1060 client_authenticator = au->name;
1061 if (au->set_client_id != NULL)
1062 client_authenticated_id = expand_string(au->set_client_id);
1065 /* Failure after writing a command */
1070 /* Failure after reading a response */
1073 if (errno != 0 || buffer[0] != '5') return FAIL;
1074 log_write(0, LOG_MAIN, "%s authenticator failed H=%s [%s] %s",
1075 au->name, host->name, host->address, buffer);
1078 /* Failure by some other means. In effect, the authenticator
1079 decided it wasn't prepared to handle this case. Typically this
1080 is the result of "fail" in an expansion string. Do we need to
1081 log anything here? Feb 2006: a message is now put in the buffer
1082 if logging is required. */
1086 log_write(0, LOG_MAIN, "%s authenticator cancelled "
1087 "authentication H=%s [%s] %s", au->name, host->name,
1088 host->address, buffer);
1091 /* Internal problem, message in buffer. */
1094 set_errno_nohost(addrlist, ERRNO_AUTHPROB, string_copy(buffer),
1099 break; /* If not authenticated, try next authenticator */
1100 } /* Loop for scanning supported server mechanisms */
1101 } /* Loop for further authenticators */
1105 /* If we haven't authenticated, but are required to, give up. */
1107 if (require_auth == OK && !smtp_authenticated)
1109 set_errno_nohost(addrlist, ERRNO_AUTHFAIL,
1110 string_sprintf("authentication required but %s", fail_reason), DEFER,
1119 /* Construct AUTH appendix string for MAIL TO */
1122 buffer to build string
1123 addrlist chain of potential addresses to deliver
1124 ob transport options
1126 Globals smtp_authenticated
1127 client_authenticated_sender
1128 Return True on error, otherwise buffer has (possibly empty) terminated string
1132 smtp_mail_auth_str(uschar *buffer, unsigned bufsize, address_item *addrlist,
1133 smtp_transport_options_block *ob)
1135 uschar *local_authenticated_sender = authenticated_sender;
1138 debug_printf("smtp_mail_auth_str: as<%s> os<%s> SA<%s>\n", authenticated_sender, ob->authenticated_sender, smtp_authenticated?"Y":"N");
1141 if (ob->authenticated_sender != NULL)
1143 uschar *new = expand_string(ob->authenticated_sender);
1146 if (!expand_string_forcedfail)
1148 uschar *message = string_sprintf("failed to expand "
1149 "authenticated_sender: %s", expand_string_message);
1150 set_errno_nohost(addrlist, ERRNO_EXPANDFAIL, message, DEFER, FALSE);
1154 else if (new[0] != 0) local_authenticated_sender = new;
1157 /* Add the authenticated sender address if present */
1159 if ((smtp_authenticated || ob->authenticated_sender_force) &&
1160 local_authenticated_sender != NULL)
1162 string_format(buffer, bufsize, " AUTH=%s",
1163 auth_xtextencode(local_authenticated_sender,
1164 Ustrlen(local_authenticated_sender)));
1165 client_authenticated_sender = string_copy(local_authenticated_sender);
1175 #ifdef EXPERIMENTAL_DANE
1176 /* Lookup TLSA record for host/port.
1177 Return: OK success with dnssec; DANE mode
1178 DEFER Do not use this host now, may retry later
1179 FAIL_FORCED No TLSA record; DANE not usable
1180 FAIL Do not use this connection
1184 tlsa_lookup(const host_item * host, dns_answer * dnsa, BOOL dane_required)
1186 /* move this out to host.c given the similarity to dns_lookup() ? */
1188 const uschar * fullname = buffer;
1190 /* TLSA lookup string */
1191 (void)sprintf(CS buffer, "_%d._tcp.%.256s", host->port, host->name);
1193 switch (dns_lookup(dnsa, buffer, T_TLSA, &fullname))
1196 if (!dns_is_secure(dnsa))
1198 log_write(0, LOG_MAIN, "DANE error: TLSA lookup not DNSSEC");
1204 return DEFER; /* just defer this TLS'd conn */
1206 case DNS_NODATA: /* no TLSA RR for this lookup */
1207 case DNS_NOMATCH: /* no records at all for this lookup */
1208 return dane_required ? FAIL : FAIL_FORCED;
1212 return dane_required ? FAIL : DEFER;
1219 typedef struct smtp_compare_s
1221 uschar *current_sender_address;
1222 struct transport_instance *tblock;
1226 /* Create a unique string that identifies this message, it is based on
1227 sender_address, helo_data and tls_certificate if enabled.
1231 smtp_local_identity(uschar * sender, struct transport_instance * tblock)
1233 address_item * addr1;
1234 uschar * if1 = US"";
1235 uschar * helo1 = US"";
1237 uschar * tlsc1 = US"";
1239 uschar * save_sender_address = sender_address;
1240 uschar * local_identity = NULL;
1241 smtp_transport_options_block * ob =
1242 (smtp_transport_options_block *)tblock->options_block;
1244 sender_address = sender;
1246 addr1 = deliver_make_addr (sender, TRUE);
1247 deliver_set_expansions(addr1);
1250 if1 = expand_string(ob->interface);
1253 helo1 = expand_string(ob->helo_data);
1256 if (ob->tls_certificate)
1257 tlsc1 = expand_string(ob->tls_certificate);
1258 local_identity = string_sprintf ("%s^%s^%s", if1, helo1, tlsc1);
1260 local_identity = string_sprintf ("%s^%s", if1, helo1);
1263 deliver_set_expansions(NULL);
1264 sender_address = save_sender_address;
1266 return local_identity;
1271 /* This routine is a callback that is called from transport_check_waiting.
1272 This function will evaluate the incoming message versus the previous
1273 message. If the incoming message is using a different local identity then
1274 we will veto this new message. */
1277 smtp_are_same_identities(uschar * message_id, smtp_compare_t * s_compare)
1279 uschar * message_local_identity,
1280 * current_local_identity,
1281 * new_sender_address;
1283 current_local_identity =
1284 smtp_local_identity(s_compare->current_sender_address, s_compare->tblock);
1286 if (!(new_sender_address = deliver_get_sender_address(message_id)))
1289 message_local_identity =
1290 smtp_local_identity(new_sender_address, s_compare->tblock);
1292 return Ustrcmp(current_local_identity, message_local_identity) == 0;
1298 ehlo_response(uschar * buf, uschar checks)
1300 size_t bsize = Ustrlen(buf);
1303 if ( checks & PEER_OFFERED_TLS
1304 && pcre_exec(regex_STARTTLS, NULL, CS buf, bsize, 0, PCRE_EOPT, NULL, 0) < 0)
1305 checks &= ~PEER_OFFERED_TLS;
1308 if ( checks & PEER_OFFERED_IGNQ
1309 && pcre_exec(regex_IGNOREQUOTA, NULL, CS buf, bsize, 0,
1310 PCRE_EOPT, NULL, 0) < 0)
1311 checks &= ~PEER_OFFERED_IGNQ;
1313 if ( checks & PEER_OFFERED_CHUNKING
1314 && pcre_exec(regex_CHUNKING, NULL, CS buf, bsize, 0, PCRE_EOPT, NULL, 0) < 0)
1315 checks &= ~PEER_OFFERED_CHUNKING;
1317 #ifndef DISABLE_PRDR
1318 if ( checks & PEER_OFFERED_PRDR
1319 && pcre_exec(regex_PRDR, NULL, CS buf, bsize, 0, PCRE_EOPT, NULL, 0) < 0)
1320 checks &= ~PEER_OFFERED_PRDR;
1324 if ( checks & PEER_OFFERED_UTF8
1325 && pcre_exec(regex_UTF8, NULL, CS buf, bsize, 0, PCRE_EOPT, NULL, 0) < 0)
1326 checks &= ~PEER_OFFERED_UTF8;
1329 if ( checks & PEER_OFFERED_DSN
1330 && pcre_exec(regex_DSN, NULL, CS buf, bsize, 0, PCRE_EOPT, NULL, 0) < 0)
1331 checks &= ~PEER_OFFERED_DSN;
1333 if ( checks & PEER_OFFERED_PIPE
1334 && pcre_exec(regex_PIPELINING, NULL, CS buf, bsize, 0,
1335 PCRE_EOPT, NULL, 0) < 0)
1336 checks &= ~PEER_OFFERED_PIPE;
1338 if ( checks & PEER_OFFERED_SIZE
1339 && pcre_exec(regex_SIZE, NULL, CS buf, bsize, 0, PCRE_EOPT, NULL, 0) < 0)
1340 checks &= ~PEER_OFFERED_SIZE;
1347 /* Callback for emitting a BDAT data chunk header.
1349 If given a nonzero size, first flush any buffered SMTP commands
1350 then emit the command.
1352 Reap previous SMTP command responses if requested, and always reap
1353 the response from a previous BDAT command.
1356 tctx transport context
1357 chunk_size value for SMTP BDAT command
1359 tc_chunk_last add LAST option to SMTP BDAT command
1360 tc_reap_prev reap response to previous SMTP commands
1362 Returns: OK or ERROR
1366 smtp_chunk_cmd_callback(transport_ctx * tctx, unsigned chunk_size,
1369 smtp_transport_options_block * ob =
1370 (smtp_transport_options_block *)(tctx->tblock->options_block);
1371 smtp_context * sx = tctx->smtp_context;
1375 /* Write SMTP chunk header command. If not reaping responses, note that
1376 there may be more writes (like, the chunk data) done soon. */
1380 if((cmd_count = smtp_write_command(&sx->outblock,
1381 flags & tc_reap_prev ? SCMD_FLUSH : SCMD_MORE,
1382 "BDAT %u%s\r\n", chunk_size, flags & tc_chunk_last ? " LAST" : "")
1383 ) < 0) return ERROR;
1384 if (flags & tc_chunk_last)
1385 data_command = string_copy(big_buffer); /* Save for later error message */
1388 prev_cmd_count = cmd_count += sx->cmd_count;
1390 /* Reap responses for any previous, but not one we just emitted */
1394 if (sx->pending_BDAT)
1397 if (flags & tc_reap_prev && prev_cmd_count > 0)
1399 DEBUG(D_transport) debug_printf("look for %d responses"
1400 " for previous pipelined cmds\n", prev_cmd_count);
1402 switch(sync_responses(sx, prev_cmd_count, 0))
1404 case 1: /* 2xx (only) => OK */
1405 case 3: sx->good_RCPT = TRUE; /* 2xx & 5xx => OK & progress made */
1406 case 2: sx->completed_addr = TRUE; /* 5xx (only) => progress made */
1407 case 0: break; /* No 2xx or 5xx, but no probs */
1409 case -1: /* Timeout on RCPT */
1410 default: return ERROR; /* I/O error, or any MAIL/DATA error */
1413 if (!sx->pending_BDAT)
1414 pipelining_active = FALSE;
1417 /* Reap response for an outstanding BDAT */
1419 if (sx->pending_BDAT)
1421 DEBUG(D_transport) debug_printf("look for one response for BDAT\n");
1423 if (!smtp_read_response(&sx->inblock, sx->buffer, sizeof(sx->buffer), '2',
1424 ob->command_timeout))
1426 if (errno == 0 && sx->buffer[0] == '4')
1428 errno = ERRNO_DATA4XX; /*XXX does this actually get used? */
1429 sx->addrlist->more_errno |=
1430 ((sx->buffer[1] - '0')*10 + sx->buffer[2] - '0') << 8;
1435 sx->pending_BDAT = FALSE;
1436 pipelining_active = FALSE;
1438 else if (chunk_size > 0)
1439 sx->pending_BDAT = TRUE;
1442 sx->cmd_count = cmd_count;
1448 /*************************************************
1449 * Make connection for given message *
1450 *************************************************/
1454 ctx connection context
1455 suppress_tls if TRUE, don't attempt a TLS connection - this is set for
1456 a second attempt after TLS initialization fails
1458 Returns: OK - the connection was made and the delivery attempted;
1459 fd is set in the conn context, tls_out set up.
1460 DEFER - the connection could not be made, or something failed
1461 while setting up the SMTP session, or there was a
1462 non-message-specific error, such as a timeout.
1463 ERROR - helo_data or add_headers or authenticated_sender is
1464 specified for this transport, and the string failed
1468 smtp_setup_conn(smtp_context * sx, BOOL suppress_tls)
1470 #if defined(SUPPORT_TLS) && defined(EXPERIMENTAL_DANE)
1471 dns_answer tlsa_dnsa;
1473 BOOL pass_message = FALSE;
1474 uschar * message = NULL;
1478 sx->ob = (smtp_transport_options_block *) sx->tblock->options_block;
1480 sx->lmtp = strcmpic(sx->ob->protocol, US"lmtp") == 0;
1481 sx->smtps = strcmpic(sx->ob->protocol, US"smtps") == 0;
1483 sx->send_rset = TRUE;
1484 sx->send_quit = TRUE;
1485 sx->setting_up = TRUE;
1487 sx->esmtp_sent = FALSE;
1489 sx->utf8_needed = FALSE;
1491 sx->dsn_all_lasthop = TRUE;
1492 #if defined(SUPPORT_TLS) && defined(EXPERIMENTAL_DANE)
1494 sx->dane_required = verify_check_given_host(&sx->ob->hosts_require_dane, sx->host) == OK;
1497 if ((sx->max_rcpt = sx->tblock->max_addresses) == 0) sx->max_rcpt = 999999;
1498 sx->peer_offered = 0;
1499 sx->igquotstr = US"";
1500 if (!sx->helo_data) sx->helo_data = sx->ob->helo_data;
1501 #ifdef EXPERIMENTAL_DSN_INFO
1502 sx->smtp_greeting = NULL;
1503 sx->helo_response = NULL;
1506 smtp_command = US"initial connection";
1507 sx->buffer[0] = '\0';
1509 /* Set up the buffer for reading SMTP response packets. */
1511 sx->inblock.buffer = sx->inbuffer;
1512 sx->inblock.buffersize = sizeof(sx->inbuffer);
1513 sx->inblock.ptr = sx->inbuffer;
1514 sx->inblock.ptrend = sx->inbuffer;
1516 /* Set up the buffer for holding SMTP commands while pipelining */
1518 sx->outblock.buffer = sx->outbuffer;
1519 sx->outblock.buffersize = sizeof(sx->outbuffer);
1520 sx->outblock.ptr = sx->outbuffer;
1521 sx->outblock.cmd_count = 0;
1522 sx->outblock.authenticating = FALSE;
1524 /* Reset the parameters of a TLS session. */
1527 tls_out.cipher = NULL; /* the one we may use for this transport */
1528 tls_out.ourcert = NULL;
1529 tls_out.peercert = NULL;
1530 tls_out.peerdn = NULL;
1531 #if defined(SUPPORT_TLS) && !defined(USE_GNUTLS)
1534 tls_out.ocsp = OCSP_NOT_REQ;
1536 /* Flip the legacy TLS-related variables over to the outbound set in case
1537 they're used in the context of the transport. Don't bother resetting
1538 afterward (when being used by a transport) as we're in a subprocess.
1539 For verify, unflipped once the callout is dealt with */
1541 tls_modify_variables(&tls_out);
1546 set_errno_nohost(sx->addrlist, ERRNO_TLSFAILURE, US"TLS support not available",
1552 /* Make a connection to the host if this isn't a continued delivery, and handle
1553 the initial interaction and HELO/EHLO/LHLO. Connect timeout errors are handled
1554 specially so they can be identified for retries. */
1556 if (continue_hostname == NULL)
1559 HDEBUG(D_verify) debug_printf("interface=%s port=%d\n", sx->interface, sx->port);
1561 /* This puts port into host->port */
1562 sx->inblock.sock = sx->outblock.sock =
1563 smtp_connect(sx->host, sx->host_af, sx->port, sx->interface,
1564 sx->ob->connect_timeout, sx->tblock);
1566 if (sx->inblock.sock < 0)
1568 uschar * msg = NULL;
1571 msg = US strerror(errno);
1572 HDEBUG(D_verify) debug_printf("connect: %s\n", msg);
1574 set_errno_nohost(sx->addrlist,
1575 errno == ETIMEDOUT ? ERRNO_CONNECTTIMEOUT : errno,
1576 sx->verify ? string_sprintf("could not connect: %s", msg)
1579 sx->send_quit = FALSE;
1583 #if defined(SUPPORT_TLS) && defined(EXPERIMENTAL_DANE)
1585 tls_out.dane_verified = FALSE;
1586 tls_out.tlsa_usage = 0;
1588 if (sx->host->dnssec == DS_YES)
1590 if( sx->dane_required
1591 || verify_check_given_host(&sx->ob->hosts_try_dane, sx->host) == OK
1593 switch (rc = tlsa_lookup(sx->host, &tlsa_dnsa, sx->dane_required))
1595 case OK: sx->dane = TRUE; break;
1596 case FAIL_FORCED: break;
1597 default: set_errno_nohost(sx->addrlist, ERRNO_DNSDEFER,
1598 string_sprintf("DANE error: tlsa lookup %s",
1599 rc == DEFER ? "DEFER" : "FAIL"),
1604 else if (sx->dane_required)
1606 set_errno_nohost(sx->addrlist, ERRNO_DNSDEFER,
1607 string_sprintf("DANE error: %s lookup not DNSSEC", sx->host->name),
1613 sx->ob->tls_tempfail_tryclear = FALSE;
1617 /* Expand the greeting message while waiting for the initial response. (Makes
1618 sense if helo_data contains ${lookup dnsdb ...} stuff). The expansion is
1619 delayed till here so that $sending_interface and $sending_port are set. */
1622 if (!(sx->helo_data = expand_string(sx->helo_data)))
1624 log_write(0, LOG_MAIN|LOG_PANIC,
1625 "<%s>: failed to expand transport's helo_data value for callout: %s",
1626 sx->addrlist->address, expand_string_message);
1631 expand_string_message = NULL;
1632 if ((sx->helo_data = string_domain_utf8_to_alabel(sx->helo_data,
1633 &expand_string_message)),
1634 expand_string_message)
1636 log_write(0, LOG_MAIN|LOG_PANIC,
1637 "<%s>: failed to expand transport's helo_data value for callout: %s",
1638 sx->addrlist->address, expand_string_message);
1640 sx->helo_data = NULL;
1644 /* The first thing is to wait for an initial OK response. The dreaded "goto"
1645 is nevertheless a reasonably clean way of programming this kind of logic,
1646 where you want to escape on any error. */
1653 (void) setsockopt(sx->inblock.sock, IPPROTO_TCP, TCP_QUICKACK, US &off, sizeof(off));
1655 good_response = smtp_read_response(&sx->inblock, sx->buffer, sizeof(sx->buffer),
1656 '2', sx->ob->command_timeout);
1657 #ifdef EXPERIMENTAL_DSN_INFO
1658 sx->smtp_greeting = string_copy(sx->buffer);
1660 if (!good_response) goto RESPONSE_FAILED;
1662 #ifndef DISABLE_EVENT
1665 lookup_dnssec_authenticated = sx->host->dnssec==DS_YES ? US"yes"
1666 : sx->host->dnssec==DS_NO ? US"no" : NULL;
1667 s = event_raise(sx->tblock->event_action, US"smtp:connect", sx->buffer);
1670 set_errno_nohost(sx->addrlist, ERRNO_EXPANDFAIL,
1671 string_sprintf("deferred by smtp:connect event expansion: %s", s),
1679 /* Now check if the helo_data expansion went well, and sign off cleanly if
1684 message = string_sprintf("failed to expand helo_data: %s",
1685 expand_string_message);
1686 set_errno_nohost(sx->addrlist, ERRNO_EXPANDFAIL, message, DEFER, FALSE);
1692 /** Debugging without sending a message
1693 sx->addrlist->transport_return = DEFER;
1697 /* Errors that occur after this point follow an SMTP command, which is
1698 left in big_buffer by smtp_write_command() for use in error messages. */
1700 smtp_command = big_buffer;
1702 /* Tell the remote who we are...
1704 February 1998: A convention has evolved that ESMTP-speaking MTAs include the
1705 string "ESMTP" in their greeting lines, so make Exim send EHLO if the
1706 greeting is of this form. The assumption was that the far end supports it
1707 properly... but experience shows that there are some that give 5xx responses,
1708 even though the banner includes "ESMTP" (there's a bloody-minded one that
1709 says "ESMTP not spoken here"). Cope with that case.
1711 September 2000: Time has passed, and it seems reasonable now to always send
1712 EHLO at the start. It is also convenient to make the change while installing
1715 July 2003: Joachim Wieland met a broken server that advertises "PIPELINING"
1716 but times out after sending MAIL FROM, RCPT TO and DATA all together. There
1717 would be no way to send out the mails, so there is now a host list
1718 "hosts_avoid_esmtp" that disables ESMTP for special hosts and solves the
1719 PIPELINING problem as well. Maybe it can also be useful to cure other
1720 problems with broken servers.
1722 Exim originally sent "Helo" at this point and ran for nearly a year that way.
1723 Then somebody tried it with a Microsoft mailer... It seems that all other
1724 mailers use upper case for some reason (the RFC is quite clear about case
1725 independence) so, for peace of mind, I gave in. */
1727 sx->esmtp = verify_check_given_host(&sx->ob->hosts_avoid_esmtp, sx->host) != OK;
1729 /* Alas; be careful, since this goto is not an error-out, so conceivably
1730 we might set data between here and the target which we assume to exist
1731 and be usable. I can see this coming back to bite us. */
1735 smtp_peer_options |= PEER_OFFERED_TLS;
1736 suppress_tls = FALSE;
1737 sx->ob->tls_tempfail_tryclear = FALSE;
1738 smtp_command = US"SSL-on-connect";
1745 if (smtp_write_command(&sx->outblock, SCMD_FLUSH, "%s %s\r\n",
1746 sx->lmtp ? "LHLO" : "EHLO", sx->helo_data) < 0)
1748 sx->esmtp_sent = TRUE;
1749 if (!smtp_read_response(&sx->inblock, sx->buffer, sizeof(sx->buffer), '2',
1750 sx->ob->command_timeout))
1752 if (errno != 0 || sx->buffer[0] == 0 || sx->lmtp)
1754 #ifdef EXPERIMENTAL_DSN_INFO
1755 sx->helo_response = string_copy(sx->buffer);
1757 goto RESPONSE_FAILED;
1761 #ifdef EXPERIMENTAL_DSN_INFO
1762 sx->helo_response = string_copy(sx->buffer);
1767 debug_printf("not sending EHLO (host matches hosts_avoid_esmtp)\n");
1772 int n = sizeof(sx->buffer);
1773 uschar * rsp = sx->buffer;
1775 if (sx->esmtp_sent && (n = Ustrlen(sx->buffer)) < sizeof(sx->buffer)/2)
1776 { rsp = sx->buffer + n + 1; n = sizeof(sx->buffer) - n; }
1778 if (smtp_write_command(&sx->outblock, SCMD_FLUSH, "HELO %s\r\n", sx->helo_data) < 0)
1780 good_response = smtp_read_response(&sx->inblock, rsp, n,
1781 '2', sx->ob->command_timeout);
1782 #ifdef EXPERIMENTAL_DSN_INFO
1783 sx->helo_response = string_copy(rsp);
1787 /* Handle special logging for a closed connection after HELO
1788 when had previously sent EHLO */
1790 if (rsp != sx->buffer && rsp[0] == 0 && (errno == 0 || errno == ECONNRESET))
1792 errno = ERRNO_SMTPCLOSED;
1793 goto EHLOHELO_FAILED;
1795 Ustrncpy(sx->buffer, rsp, sizeof(sx->buffer)/2);
1796 goto RESPONSE_FAILED;
1800 sx->peer_offered = smtp_peer_options = 0;
1802 if (sx->esmtp || sx->lmtp)
1804 sx->peer_offered = ehlo_response(sx->buffer,
1805 PEER_OFFERED_TLS /* others checked later */
1808 /* Set tls_offered if the response to EHLO specifies support for STARTTLS. */
1811 smtp_peer_options |= sx->peer_offered & PEER_OFFERED_TLS;
1816 /* For continuing deliveries down the same channel, having re-exec'd the socket
1817 is the standard input; for a socket held open from verify it is recorded
1818 in the cutthrough context block. Either way we don't need to redo EHLO here
1819 (but may need to do so for TLS - see below).
1820 Set up the pointer to where subsequent commands will be left, for
1821 error messages. Note that smtp_peer_options will have been
1822 set from the command line if they were set in the process that passed the
1825 /*XXX continue case needs to propagate DSN_INFO, prob. in deliver.c
1826 as the continue goes via transport_pass_socket() and doublefork and exec.
1827 It does not wait. Unclear how we keep separate host's responses
1828 separate - we could match up by host ip+port as a bodge. */
1832 if (cutthrough.fd >= 0 && cutthrough.callout_hold_only)
1834 sx->inblock.sock = sx->outblock.sock = cutthrough.fd;
1835 sx->host->port = sx->port = cutthrough.host.port;
1839 sx->inblock.sock = sx->outblock.sock = 0; /* stdin */
1840 sx->host->port = sx->port; /* Record the port that was used */
1842 smtp_command = big_buffer;
1843 sx->helo_data = NULL; /* ensure we re-expand ob->helo_data */
1845 /* For a continued connection with TLS being proxied for us, or a
1846 held-open verify connection with TLS, nothing more to do. */
1848 if ( continue_proxy_cipher
1849 || (cutthrough.fd >= 0 && cutthrough.callout_hold_only && cutthrough.is_tls)
1852 sx->peer_offered = smtp_peer_options;
1853 pipelining_active = !!(smtp_peer_options & PEER_OFFERED_PIPE);
1854 HDEBUG(D_transport) debug_printf("continued connection, %s TLS\n",
1855 continue_proxy_cipher ? "proxied" : "verify conn with");
1858 HDEBUG(D_transport) debug_printf("continued connection, no TLS\n");
1861 /* If TLS is available on this connection, whether continued or not, attempt to
1862 start up a TLS session, unless the host is in hosts_avoid_tls. If successful,
1863 send another EHLO - the server may give a different answer in secure mode. We
1864 use a separate buffer for reading the response to STARTTLS so that if it is
1865 negative, the original EHLO data is available for subsequent analysis, should
1866 the client not be required to use TLS. If the response is bad, copy the buffer
1867 for error analysis. */
1870 if ( smtp_peer_options & PEER_OFFERED_TLS
1872 && verify_check_given_host(&sx->ob->hosts_avoid_tls, sx->host) != OK
1874 || verify_check_given_host(&sx->ob->hosts_verify_avoid_tls, sx->host) != OK
1877 uschar buffer2[4096];
1878 if (smtp_write_command(&sx->outblock, SCMD_FLUSH, "STARTTLS\r\n") < 0)
1881 /* If there is an I/O error, transmission of this message is deferred. If
1882 there is a temporary rejection of STARRTLS and tls_tempfail_tryclear is
1883 false, we also defer. However, if there is a temporary rejection of STARTTLS
1884 and tls_tempfail_tryclear is true, or if there is an outright rejection of
1885 STARTTLS, we carry on. This means we will try to send the message in clear,
1886 unless the host is in hosts_require_tls (tested below). */
1888 if (!smtp_read_response(&sx->inblock, buffer2, sizeof(buffer2), '2',
1889 sx->ob->command_timeout))
1893 || (buffer2[0] == '4' && !sx->ob->tls_tempfail_tryclear)
1896 Ustrncpy(sx->buffer, buffer2, sizeof(sx->buffer));
1897 sx->buffer[sizeof(sx->buffer)-1] = '\0';
1898 goto RESPONSE_FAILED;
1902 /* STARTTLS accepted: try to negotiate a TLS session. */
1907 address_item * addr;
1909 int rc = tls_client_start(sx->inblock.sock, sx->host, sx->addrlist, sx->tblock,
1910 # ifdef EXPERIMENTAL_DANE
1911 sx->dane ? &tlsa_dnsa : NULL,
1915 /* TLS negotiation failed; give an error. From outside, this function may
1916 be called again to try in clear on a new connection, if the options permit
1917 it for this host. */
1921 # ifdef EXPERIMENTAL_DANE
1922 if (sx->dane) log_write(0, LOG_MAIN,
1923 "DANE attempt failed; TLS connection to %s [%s]: %s",
1924 sx->host->name, sx->host->address, errstr);
1927 errno = ERRNO_TLSFAILURE;
1928 message = string_sprintf("TLS session: %s", errstr);
1929 sx->send_quit = FALSE;
1933 /* TLS session is set up */
1935 smtp_peer_options_wrap = smtp_peer_options;
1936 for (addr = sx->addrlist; addr; addr = addr->next)
1937 if (addr->transport_return == PENDING_DEFER)
1939 addr->cipher = tls_out.cipher;
1940 addr->ourcert = tls_out.ourcert;
1941 addr->peercert = tls_out.peercert;
1942 addr->peerdn = tls_out.peerdn;
1943 addr->ocsp = tls_out.ocsp;
1948 /* if smtps, we'll have smtp_command set to something else; always safe to
1950 smtp_command = big_buffer;
1952 /* If we started TLS, redo the EHLO/LHLO exchange over the secure channel. If
1953 helo_data is null, we are dealing with a connection that was passed from
1954 another process, and so we won't have expanded helo_data above. We have to
1955 expand it here. $sending_ip_address and $sending_port are set up right at the
1956 start of the Exim process (in exim.c). */
1958 if (tls_out.active >= 0)
1963 if (!sx->helo_data && !(sx->helo_data = expand_string(sx->ob->helo_data)))
1965 uschar *message = string_sprintf("failed to expand helo_data: %s",
1966 expand_string_message);
1967 set_errno_nohost(sx->addrlist, ERRNO_EXPANDFAIL, message, DEFER, FALSE);
1972 /* For SMTPS we need to wait for the initial OK response. */
1975 good_response = smtp_read_response(&sx->inblock, sx->buffer, sizeof(sx->buffer),
1976 '2', sx->ob->command_timeout);
1977 #ifdef EXPERIMENTAL_DSN_INFO
1978 sx->smtp_greeting = string_copy(sx->buffer);
1980 if (!good_response) goto RESPONSE_FAILED;
1984 greeting_cmd = "EHLO";
1987 greeting_cmd = "HELO";
1989 debug_printf("not sending EHLO (host matches hosts_avoid_esmtp)\n");
1992 if (smtp_write_command(&sx->outblock, SCMD_FLUSH, "%s %s\r\n",
1993 sx->lmtp ? "LHLO" : greeting_cmd, sx->helo_data) < 0)
1995 good_response = smtp_read_response(&sx->inblock, sx->buffer, sizeof(sx->buffer),
1996 '2', sx->ob->command_timeout);
1997 #ifdef EXPERIMENTAL_DSN_INFO
1998 sx->helo_response = string_copy(sx->buffer);
2000 if (!good_response) goto RESPONSE_FAILED;
2001 smtp_peer_options = 0;
2004 /* If the host is required to use a secure channel, ensure that we
2008 # ifdef EXPERIMENTAL_DANE
2011 || verify_check_given_host(&sx->ob->hosts_require_tls, sx->host) == OK
2014 errno = ERRNO_TLSREQUIRED;
2015 message = string_sprintf("a TLS session is required, but %s",
2016 smtp_peer_options & PEER_OFFERED_TLS
2017 ? "an attempt to start TLS failed" : "the server did not offer TLS support");
2020 #endif /*SUPPORT_TLS*/
2022 /* If TLS is active, we have just started it up and re-done the EHLO command,
2023 so its response needs to be analyzed. If TLS is not active and this is a
2024 continued session down a previously-used socket, we haven't just done EHLO, so
2027 if (continue_hostname == NULL
2029 || tls_out.active >= 0
2033 if (sx->esmtp || sx->lmtp)
2035 sx->peer_offered = ehlo_response(sx->buffer,
2037 | (sx->lmtp && sx->ob->lmtp_ignore_quota ? PEER_OFFERED_IGNQ : 0)
2038 | PEER_OFFERED_CHUNKING
2041 | (sx->addrlist->prop.utf8_msg ? PEER_OFFERED_UTF8 : 0)
2042 /*XXX if we hand peercaps on to continued-conn processes,
2043 must not depend on this addr */
2047 | (sx->ob->size_addition >= 0 ? PEER_OFFERED_SIZE : 0)
2050 /* Set for IGNOREQUOTA if the response to LHLO specifies support and the
2051 lmtp_ignore_quota option was set. */
2053 sx->igquotstr = sx->peer_offered & PEER_OFFERED_IGNQ ? US" IGNOREQUOTA" : US"";
2055 /* If the response to EHLO specified support for the SIZE parameter, note
2056 this, provided size_addition is non-negative. */
2058 smtp_peer_options |= sx->peer_offered & PEER_OFFERED_SIZE;
2060 /* Note whether the server supports PIPELINING. If hosts_avoid_esmtp matched
2061 the current host, esmtp will be false, so PIPELINING can never be used. If
2062 the current host matches hosts_avoid_pipelining, don't do it. */
2064 if ( sx->peer_offered & PEER_OFFERED_PIPE
2065 && verify_check_given_host(&sx->ob->hosts_avoid_pipelining, sx->host) != OK)
2066 smtp_peer_options |= PEER_OFFERED_PIPE;
2068 DEBUG(D_transport) debug_printf("%susing PIPELINING\n",
2069 smtp_peer_options & PEER_OFFERED_PIPE ? "" : "not ");
2071 if ( sx->peer_offered & PEER_OFFERED_CHUNKING
2072 && verify_check_given_host(&sx->ob->hosts_try_chunking, sx->host) != OK)
2073 sx->peer_offered &= ~PEER_OFFERED_CHUNKING;
2075 if (sx->peer_offered & PEER_OFFERED_CHUNKING)
2076 {DEBUG(D_transport) debug_printf("CHUNKING usable\n");}
2078 #ifndef DISABLE_PRDR
2079 if ( sx->peer_offered & PEER_OFFERED_PRDR
2080 && verify_check_given_host(&sx->ob->hosts_try_prdr, sx->host) != OK)
2081 sx->peer_offered &= ~PEER_OFFERED_PRDR;
2083 if (sx->peer_offered & PEER_OFFERED_PRDR)
2084 {DEBUG(D_transport) debug_printf("PRDR usable\n");}
2087 /* Note if the server supports DSN */
2088 smtp_peer_options |= sx->peer_offered & PEER_OFFERED_DSN;
2089 DEBUG(D_transport) debug_printf("%susing DSN\n",
2090 sx->peer_offered & PEER_OFFERED_DSN ? "" : "not ");
2092 /* Note if the response to EHLO specifies support for the AUTH extension.
2093 If it has, check that this host is one we want to authenticate to, and do
2094 the business. The host name and address must be available when the
2095 authenticator's client driver is running. */
2097 switch (yield = smtp_auth(sx->buffer, sizeof(sx->buffer), sx->addrlist, sx->host,
2098 sx->ob, sx->esmtp, &sx->inblock, &sx->outblock))
2100 default: goto SEND_QUIT;
2102 case FAIL_SEND: goto SEND_FAILED;
2103 case FAIL: goto RESPONSE_FAILED;
2107 pipelining_active = !!(smtp_peer_options & PEER_OFFERED_PIPE);
2109 /* The setting up of the SMTP call is now complete. Any subsequent errors are
2110 message-specific. */
2112 sx->setting_up = FALSE;
2115 if (sx->addrlist->prop.utf8_msg)
2117 sx->utf8_needed = !sx->addrlist->prop.utf8_downcvt
2118 && !sx->addrlist->prop.utf8_downcvt_maybe;
2119 DEBUG(D_transport) if (!sx->utf8_needed)
2120 debug_printf("utf8: %s downconvert\n",
2121 sx->addrlist->prop.utf8_downcvt ? "mandatory" : "optional");
2124 /* If this is an international message we need the host to speak SMTPUTF8 */
2125 if (sx->utf8_needed && !(sx->peer_offered & PEER_OFFERED_UTF8))
2127 errno = ERRNO_UTF8_FWD;
2128 goto RESPONSE_FAILED;
2140 sx->send_quit = check_response(sx->host, &errno, sx->addrlist->more_errno,
2141 sx->buffer, &code, &message, &pass_message);
2146 message = US string_sprintf("send() to %s [%s] failed: %s",
2147 sx->host->name, sx->host->address, strerror(errno));
2148 sx->send_quit = FALSE;
2151 /* This label is jumped to directly when a TLS negotiation has failed,
2152 or was not done for a host for which it is required. Values will be set
2153 in message and errno, and setting_up will always be true. Treat as
2154 a temporary error. */
2158 message = string_sprintf("Remote host closed connection in response to %s"
2159 " (EHLO response was: %s)", smtp_command, sx->buffer);
2160 sx->send_quit = FALSE;
2169 /* The failure happened while setting up the call; see if the failure was
2170 a 5xx response (this will either be on connection, or following HELO - a 5xx
2171 after EHLO causes it to try HELO). If so, fail all addresses, as this host is
2172 never going to accept them. For other errors during setting up (timeouts or
2173 whatever), defer all addresses, and yield DEFER, so that the host is not
2174 tried again for a while. */
2177 sx->ok = FALSE; /* For when reached by GOTO */
2181 || errno == ERRNO_UTF8_FWD
2185 set_errno(sx->addrlist, errno, message, yield, pass_message, sx->host
2186 #ifdef EXPERIMENTAL_DSN_INFO
2187 , sx->smtp_greeting, sx->helo_response
2196 (void)smtp_write_command(&sx->outblock, SCMD_FLUSH, "QUIT\r\n");
2199 tls_close(FALSE, TRUE);
2202 /* Close the socket, and return the appropriate value, first setting
2203 works because the NULL setting is passed back to the calling process, and
2204 remote_max_parallel is forced to 1 when delivering over an existing connection,
2207 HDEBUG(D_transport|D_acl|D_v) debug_printf_indent(" SMTP(close)>>\n");
2210 shutdown(sx->outblock.sock, SHUT_WR);
2211 if (fcntl(sx->inblock.sock, F_SETFL, O_NONBLOCK) == 0)
2212 for (rc = 16; read(sx->inblock.sock, sx->inbuffer, sizeof(sx->inbuffer)) > 0 && rc > 0;)
2213 rc--; /* drain socket */
2214 sx->send_quit = FALSE;
2216 (void)close(sx->inblock.sock);
2217 sx->inblock.sock = sx->outblock.sock = -1;
2219 #ifndef DISABLE_EVENT
2220 (void) event_raise(sx->tblock->event_action, US"tcp:close", NULL);
2223 continue_transport = NULL;
2224 continue_hostname = NULL;
2231 /* Create the string of options that will be appended to the MAIL FROM:
2232 in the connection context buffer */
2235 build_mailcmd_options(smtp_context * sx, address_item * addrlist)
2237 uschar * p = sx->buffer;
2238 address_item * addr;
2243 /* If we know the receiving MTA supports the SIZE qualification,
2244 send it, adding something to the message size to allow for imprecision
2245 and things that get added en route. Exim keeps the number of lines
2246 in a message, so we can give an accurate value for the original message, but we
2247 need some additional to handle added headers. (Double "." characters don't get
2248 included in the count.) */
2250 if (sx->peer_offered & PEER_OFFERED_SIZE)
2252 /*XXX problem here under spool_files_wireformat?
2253 Or just forget about lines? Or inflate by a fixed proportion? */
2255 sprintf(CS p, " SIZE=%d", message_size+message_linecount+sx->ob->size_addition);
2259 #ifndef DISABLE_PRDR
2260 /* If it supports Per-Recipient Data Reponses, and we have omre than one recipient,
2263 sx->prdr_active = FALSE;
2264 if (sx->peer_offered & PEER_OFFERED_PRDR)
2265 for (addr = addrlist; addr; addr = addr->next)
2266 if (addr->transport_return == PENDING_DEFER)
2268 for (addr = addr->next; addr; addr = addr->next)
2269 if (addr->transport_return == PENDING_DEFER)
2270 { /* at least two recipients to send */
2271 sx->prdr_active = TRUE;
2272 sprintf(CS p, " PRDR"); p += 5;
2280 /* If it supports internationalised messages, and this meesage need that,
2283 if ( sx->peer_offered & PEER_OFFERED_UTF8
2284 && addrlist->prop.utf8_msg
2285 && !addrlist->prop.utf8_downcvt
2287 Ustrcpy(p, " SMTPUTF8"), p += 9;
2290 /* check if all addresses have DSN-lasthop flag; do not send RET and ENVID if so */
2291 for (sx->dsn_all_lasthop = TRUE, addr = addrlist, address_count = 0;
2292 addr && address_count < sx->max_rcpt;
2293 addr = addr->next) if (addr->transport_return == PENDING_DEFER)
2296 if (!(addr->dsn_flags & rf_dsnlasthop))
2298 sx->dsn_all_lasthop = FALSE;
2303 /* Add any DSN flags to the mail command */
2305 if (sx->peer_offered & PEER_OFFERED_DSN && !sx->dsn_all_lasthop)
2307 if (dsn_ret == dsn_ret_hdrs)
2308 { Ustrcpy(p, " RET=HDRS"); p += 9; }
2309 else if (dsn_ret == dsn_ret_full)
2310 { Ustrcpy(p, " RET=FULL"); p += 9; }
2314 string_format(p, sizeof(sx->buffer) - (p-sx->buffer), " ENVID=%s", dsn_envid);
2319 /* If an authenticated_sender override has been specified for this transport
2320 instance, expand it. If the expansion is forced to fail, and there was already
2321 an authenticated_sender for this message, the original value will be used.
2322 Other expansion failures are serious. An empty result is ignored, but there is
2323 otherwise no check - this feature is expected to be used with LMTP and other
2324 cases where non-standard addresses (e.g. without domains) might be required. */
2326 if (smtp_mail_auth_str(p, sizeof(sx->buffer) - (p-sx->buffer), addrlist, sx->ob))
2334 build_rcptcmd_options(smtp_context * sx, const address_item * addr)
2336 uschar * p = sx->buffer;
2339 /* Add any DSN flags to the rcpt command */
2341 if (sx->peer_offered & PEER_OFFERED_DSN && !(addr->dsn_flags & rf_dsnlasthop))
2343 if (addr->dsn_flags & rf_dsnflags)
2348 Ustrcpy(p, " NOTIFY=");
2350 for (i = 0; i < nelem(rf_list); i++) if (addr->dsn_flags & rf_list[i])
2352 if (!first) *p++ = ',';
2354 Ustrcpy(p, rf_names[i]);
2359 if (addr->dsn_orcpt)
2361 string_format(p, sizeof(sx->buffer) - (p-sx->buffer), " ORCPT=%s",
2372 0 good, rcpt results in addr->transport_return (PENDING_OK, DEFER, FAIL)
2373 -1 MAIL response error
2374 -2 any non-MAIL read i/o error
2375 -3 non-MAIL response timeout
2376 -4 internal error; channel still usable
2381 smtp_write_mail_and_rcpt_cmds(smtp_context * sx, int * yield)
2383 address_item * addr;
2387 if (build_mailcmd_options(sx, sx->first_addr) != OK)
2393 /* From here until we send the DATA command, we can make use of PIPELINING
2394 if the server host supports it. The code has to be able to check the responses
2395 at any point, for when the buffer fills up, so we write it totally generally.
2396 When PIPELINING is off, each command written reports that it has flushed the
2399 sx->pending_MAIL = TRUE; /* The block starts with MAIL */
2402 uschar * s = sx->from_addr;
2404 uschar * errstr = NULL;
2406 /* If we must downconvert, do the from-address here. Remember we had to
2407 for the to-addresses (done below), and also (ugly) for re-doing when building
2408 the delivery log line. */
2410 if ( sx->addrlist->prop.utf8_msg
2411 && (sx->addrlist->prop.utf8_downcvt || !(sx->peer_offered & PEER_OFFERED_UTF8))
2414 if (s = string_address_utf8_to_alabel(s, &errstr), errstr)
2416 set_errno_nohost(sx->addrlist, ERRNO_EXPANDFAIL, errstr, DEFER, FALSE);
2420 setflag(sx->addrlist, af_utf8_downcvt);
2424 rc = smtp_write_command(&sx->outblock, pipelining_active ? SCMD_BUFFER : SCMD_FLUSH,
2425 "MAIL FROM:<%s>%s\r\n", s, sx->buffer);
2428 mail_command = string_copy(big_buffer); /* Save for later error message */
2432 case -1: /* Transmission error */
2435 case +1: /* Cmd was sent */
2436 if (!smtp_read_response(&sx->inblock, sx->buffer, sizeof(sx->buffer), '2',
2437 sx->ob->command_timeout))
2439 if (errno == 0 && sx->buffer[0] == '4')
2441 errno = ERRNO_MAIL4XX;
2442 sx->addrlist->more_errno |= ((sx->buffer[1] - '0')*10 + sx->buffer[2] - '0') << 8;
2446 sx->pending_MAIL = FALSE;
2449 /* otherwise zero: command queued for pipeline */
2452 /* Pass over all the relevant recipient addresses for this host, which are the
2453 ones that have status PENDING_DEFER. If we are using PIPELINING, we can send
2454 several before we have to read the responses for those seen so far. This
2455 checking is done by a subroutine because it also needs to be done at the end.
2456 Send only up to max_rcpt addresses at a time, leaving next_addr pointing to
2457 the next one if not all are sent.
2459 In the MUA wrapper situation, we want to flush the PIPELINING buffer for the
2460 last address because we want to abort if any recipients have any kind of
2461 problem, temporary or permanent. We know that all recipient addresses will have
2462 the PENDING_DEFER status, because only one attempt is ever made, and we know
2463 that max_rcpt will be large, so all addresses will be done at once.
2465 For verify we flush the pipeline after any (the only) rcpt address. */
2467 for (addr = sx->first_addr, address_count = 0;
2468 addr && address_count < sx->max_rcpt;
2469 addr = addr->next) if (addr->transport_return == PENDING_DEFER)
2475 addr->dsn_aware = sx->peer_offered & PEER_OFFERED_DSN
2476 ? dsn_support_yes : dsn_support_no;
2479 no_flush = pipelining_active && !sx->verify
2480 && (!mua_wrapper || addr->next && address_count < sx->max_rcpt);
2482 build_rcptcmd_options(sx, addr);
2484 /* Now send the RCPT command, and process outstanding responses when
2485 necessary. After a timeout on RCPT, we just end the function, leaving the
2486 yield as OK, because this error can often mean that there is a problem with
2487 just one address, so we don't want to delay the host. */
2489 rcpt_addr = transport_rcpt_address(addr, sx->tblock->rcpt_include_affixes);
2492 if ( testflag(sx->addrlist, af_utf8_downcvt)
2493 && !(rcpt_addr = string_address_utf8_to_alabel(rcpt_addr, NULL))
2496 /*XXX could we use a per-address errstr here? Not fail the whole send? */
2497 errno = ERRNO_EXPANDFAIL;
2498 return -5; /*XXX too harsh? */
2502 count = smtp_write_command(&sx->outblock, no_flush ? SCMD_BUFFER : SCMD_FLUSH,
2503 "RCPT TO:<%s>%s%s\r\n", rcpt_addr, sx->igquotstr, sx->buffer);
2505 if (count < 0) return -5;
2508 switch(sync_responses(sx, count, 0))
2510 case 3: sx->ok = TRUE; /* 2xx & 5xx => OK & progress made */
2511 case 2: sx->completed_addr = TRUE; /* 5xx (only) => progress made */
2514 case 1: sx->ok = TRUE; /* 2xx (only) => OK, but if LMTP, */
2515 if (!sx->lmtp) /* can't tell about progress yet */
2516 sx->completed_addr = TRUE;
2517 case 0: /* No 2xx or 5xx, but no probs */
2520 case -1: return -3; /* Timeout on RCPT */
2521 case -2: return -2; /* non-MAIL read i/o error */
2522 default: return -1; /* any MAIL error */
2524 sx->pending_MAIL = FALSE; /* Dealt with MAIL */
2526 } /* Loop for next address */
2528 sx->next_addr = addr;
2534 /*****************************************************
2535 * Proxy TLS connection for another transport process *
2536 ******************************************************/
2538 Use the given buffer as a staging area, and select on both the given fd
2539 and the TLS'd client-fd for data to read (per the coding in ip_recv() and
2540 fd_ready() this is legitimate). Do blocking full-size writes, and reads
2544 buf space to use for buffering
2545 bufsiz size of buffer
2546 proxy_fd comms to proxied process
2547 timeout per-read timeout, seconds
2551 smtp_proxy_tls(uschar * buf, size_t bsize, int proxy_fd, int timeout)
2554 int max_fd = MAX(proxy_fd, tls_out.active) + 1;
2555 int rc, i, fd_bits, nbytes;
2557 set_process_info("proxying TLS connection for continued transport");
2559 FD_SET(tls_out.active, &fds);
2560 FD_SET(proxy_fd, &fds);
2562 for (fd_bits = 3; fd_bits; )
2564 time_t time_left = timeout;
2565 time_t time_start = time(NULL);
2570 struct timeval tv = { time_left, 0 };
2572 rc = select(max_fd, (SELECT_ARG2_TYPE *)&fds, NULL, NULL, &tv);
2574 if (rc < 0 && errno == EINTR)
2575 if ((time_left -= time(NULL) - time_start) > 0) continue;
2579 DEBUG(D_transport) if (rc == 0) debug_printf("%s: timed out\n", __FUNCTION__);
2583 while (rc < 0 || !(FD_ISSET(tls_out.active, &fds) || FD_ISSET(proxy_fd, &fds)));
2585 /* handle inbound data */
2586 if (FD_ISSET(tls_out.active, &fds))
2587 if ((rc = tls_read(FALSE, buf, bsize)) <= 0)
2590 FD_CLR(tls_out.active, &fds);
2591 shutdown(proxy_fd, SHUT_WR);
2595 for (nbytes = 0; rc - nbytes > 0; nbytes += i)
2596 if ((i = write(proxy_fd, buf + nbytes, rc - nbytes)) < 0) return;
2598 else if (fd_bits & 1)
2599 FD_SET(tls_out.active, &fds);
2601 /* handle outbound data */
2602 if (FD_ISSET(proxy_fd, &fds))
2603 if ((rc = read(proxy_fd, buf, bsize)) <= 0)
2606 FD_CLR(proxy_fd, &fds);
2607 shutdown(tls_out.active, SHUT_WR);
2611 for (nbytes = 0; rc - nbytes > 0; nbytes += i)
2612 if ((i = tls_write(FALSE, buf + nbytes, rc - nbytes)) < 0) return;
2614 else if (fd_bits & 2)
2615 FD_SET(proxy_fd, &fds);
2621 /*************************************************
2622 * Deliver address list to given host *
2623 *************************************************/
2625 /* If continue_hostname is not null, we get here only when continuing to
2626 deliver down an existing channel. The channel was passed as the standard
2627 input. TLS is never active on a passed channel; the previous process always
2628 closes it down before passing the connection on.
2630 Otherwise, we have to make a connection to the remote host, and do the
2631 initial protocol exchange.
2633 When running as an MUA wrapper, if the sender or any recipient is rejected,
2634 temporarily or permanently, we force failure for all recipients.
2637 addrlist chain of potential addresses to deliver; only those whose
2638 transport_return field is set to PENDING_DEFER are currently
2639 being processed; others should be skipped - they have either
2640 been delivered to an earlier host or IP address, or been
2641 failed by one of them.
2642 host host to deliver to
2643 host_af AF_INET or AF_INET6
2644 port default TCP/IP port to use, in host byte order
2645 interface interface to bind to, or NULL
2646 tblock transport instance block
2647 message_defer set TRUE if yield is OK, but all addresses were deferred
2648 because of a non-recipient, non-host failure, that is, a
2649 4xx response to MAIL FROM, DATA, or ".". This is a defer
2650 that is specific to the message.
2651 suppress_tls if TRUE, don't attempt a TLS connection - this is set for
2652 a second attempt after TLS initialization fails
2654 Returns: OK - the connection was made and the delivery attempted;
2655 the result for each address is in its data block.
2656 DEFER - the connection could not be made, or something failed
2657 while setting up the SMTP session, or there was a
2658 non-message-specific error, such as a timeout.
2659 ERROR - a filter command is specified for this transport,
2660 and there was a problem setting it up; OR helo_data
2661 or add_headers or authenticated_sender is specified
2662 for this transport, and the string failed to expand
2666 smtp_deliver(address_item *addrlist, host_item *host, int host_af, int port,
2667 uschar *interface, transport_instance *tblock,
2668 BOOL *message_defer, BOOL suppress_tls)
2674 time_t start_delivery_time = time(NULL);
2676 BOOL pass_message = FALSE;
2677 uschar *message = NULL;
2678 uschar new_message_id[MESSAGE_ID_LENGTH + 1];
2683 suppress_tls = suppress_tls; /* stop compiler warning when no TLS support */
2684 *message_defer = FALSE;
2686 sx.addrlist = addrlist;
2688 sx.host_af = host_af,
2690 sx.interface = interface;
2691 sx.helo_data = NULL;
2695 /* Get the channel set up ready for a message (MAIL FROM being the next
2696 SMTP command to send */
2698 if ((rc = smtp_setup_conn(&sx, suppress_tls)) != OK)
2701 /* If there is a filter command specified for this transport, we can now
2702 set it up. This cannot be done until the identify of the host is known. */
2704 if (tblock->filter_command)
2706 transport_filter_timeout = tblock->filter_timeout;
2708 /* On failure, copy the error to all addresses, abandon the SMTP call, and
2711 if (!transport_set_up_command(&transport_filter_argv,
2712 tblock->filter_command, TRUE, DEFER, addrlist,
2713 string_sprintf("%.50s transport", tblock->name), NULL))
2715 set_errno_nohost(addrlist->next, addrlist->basic_errno, addrlist->message, DEFER,
2721 if ( transport_filter_argv
2722 && *transport_filter_argv
2723 && **transport_filter_argv
2724 && sx.peer_offered & PEER_OFFERED_CHUNKING
2727 sx.peer_offered &= ~PEER_OFFERED_CHUNKING;
2728 DEBUG(D_transport) debug_printf("CHUNKING not usable due to transport filter\n");
2732 sx.first_addr = addrlist;
2734 /* For messages that have more than the maximum number of envelope recipients,
2735 we want to send several transactions down the same SMTP connection. (See
2736 comments in deliver.c as to how this reconciles, heuristically, with
2737 remote_max_parallel.) This optimization was added to Exim after the following
2738 code was already working. The simplest way to put it in without disturbing the
2739 code was to use a goto to jump back to this point when there is another
2740 transaction to handle. */
2743 sx.from_addr = return_path;
2744 sx.sync_addr = sx.first_addr;
2746 sx.send_rset = TRUE;
2747 sx.completed_addr = FALSE;
2750 /* If we are a continued-connection-after-verify the MAIL and RCPT
2751 commands were already sent; do not re-send but do mark the addrs as
2752 having been accepted up to RCPT stage. A traditional cont-conn
2753 always has a sequence number greater than one. */
2755 if (continue_hostname && continue_sequence == 1)
2757 address_item * addr;
2759 sx.peer_offered = smtp_peer_options;
2760 sx.pending_MAIL = FALSE;
2762 sx.next_addr = NULL;
2764 for (addr = addrlist; addr; addr = addr->next)
2765 addr->transport_return = PENDING_OK;
2769 /* Initiate a message transfer. */
2771 switch(smtp_write_mail_and_rcpt_cmds(&sx, &yield))
2774 case -1: case -2: goto RESPONSE_FAILED;
2775 case -3: goto END_OFF;
2776 case -4: goto SEND_QUIT;
2777 default: goto SEND_FAILED;
2780 /* If we are an MUA wrapper, abort if any RCPTs were rejected, either
2781 permanently or temporarily. We should have flushed and synced after the last
2789 for (a = sx.first_addr, cnt = 0; a && cnt < sx.max_rcpt; a = a->next, cnt++)
2790 if (a->transport_return != PENDING_OK)
2792 /*XXX could we find a better errno than 0 here? */
2793 set_errno_nohost(addrlist, 0, a->message, FAIL,
2794 testflag(a, af_pass_message));
2801 /* If ok is TRUE, we know we have got at least one good recipient, and must now
2802 send DATA, but if it is FALSE (in the normal, non-wrapper case), we may still
2803 have a good recipient buffered up if we are pipelining. We don't want to waste
2804 time sending DATA needlessly, so we only send it if either ok is TRUE or if we
2805 are pipelining. The responses are all handled by sync_responses().
2806 If using CHUNKING, do not send a BDAT until we know how big a chunk we want
2809 if ( !(sx.peer_offered & PEER_OFFERED_CHUNKING)
2810 && (sx.ok || (pipelining_active && !mua_wrapper)))
2812 int count = smtp_write_command(&sx.outblock, SCMD_FLUSH, "DATA\r\n");
2814 if (count < 0) goto SEND_FAILED;
2815 switch(sync_responses(&sx, count, sx.ok ? +1 : -1))
2817 case 3: sx.ok = TRUE; /* 2xx & 5xx => OK & progress made */
2818 case 2: sx.completed_addr = TRUE; /* 5xx (only) => progress made */
2821 case 1: sx.ok = TRUE; /* 2xx (only) => OK, but if LMTP, */
2822 if (!sx.lmtp) sx.completed_addr = TRUE; /* can't tell about progress yet */
2823 case 0: break; /* No 2xx or 5xx, but no probs */
2825 case -1: goto END_OFF; /* Timeout on RCPT */
2826 default: goto RESPONSE_FAILED; /* I/O error, or any MAIL/DATA error */
2828 pipelining_active = FALSE;
2829 data_command = string_copy(big_buffer); /* Save for later error message */
2832 /* If there were no good recipients (but otherwise there have been no
2833 problems), just set ok TRUE, since we have handled address-specific errors
2834 already. Otherwise, it's OK to send the message. Use the check/escape mechanism
2835 for handling the SMTP dot-handling protocol, flagging to apply to headers as
2836 well as body. Set the appropriate timeout value to be used for each chunk.
2837 (Haven't been able to make it work using select() for writing yet.) */
2839 if (!(sx.peer_offered & PEER_OFFERED_CHUNKING) && !sx.ok)
2841 /* Save the first address of the next batch. */
2842 sx.first_addr = sx.next_addr;
2848 transport_ctx tctx = {
2852 US".", US"..", /* Escaping strings */
2853 topt_use_crlf | topt_escape_headers
2854 | (tblock->body_only ? topt_no_headers : 0)
2855 | (tblock->headers_only ? topt_no_body : 0)
2856 | (tblock->return_path_add ? topt_add_return_path : 0)
2857 | (tblock->delivery_date_add ? topt_add_delivery_date : 0)
2858 | (tblock->envelope_to_add ? topt_add_envelope_to : 0)
2861 /* If using CHUNKING we need a callback from the generic transport
2862 support to us, for the sending of BDAT smtp commands and the reaping
2863 of responses. The callback needs a whole bunch of state so set up
2864 a transport-context structure to be passed around. */
2866 if (sx.peer_offered & PEER_OFFERED_CHUNKING)
2868 tctx.check_string = tctx.escape_string = NULL;
2869 tctx.options |= topt_use_bdat;
2870 tctx.chunk_cb = smtp_chunk_cmd_callback;
2871 sx.pending_BDAT = FALSE;
2872 sx.good_RCPT = sx.ok;
2874 tctx.smtp_context = &sx;
2877 tctx.options |= topt_end_dot;
2879 /* Save the first address of the next batch. */
2880 sx.first_addr = sx.next_addr;
2882 /* Responses from CHUNKING commands go in buffer. Otherwise,
2883 there has not been a response. */
2887 sigalrm_seen = FALSE;
2888 transport_write_timeout = sx.ob->data_timeout;
2889 smtp_command = US"sending data block"; /* For error messages */
2890 DEBUG(D_transport|D_v)
2891 if (sx.peer_offered & PEER_OFFERED_CHUNKING)
2892 debug_printf(" will write message using CHUNKING\n");
2894 debug_printf(" SMTP>> writing message and terminating \".\"\n");
2895 transport_count = 0;
2897 #ifndef DISABLE_DKIM
2898 sx.ok = dkim_transport_write_message(&tctx, &sx.ob->dkim, CUSS &message);
2900 sx.ok = transport_write_message(&tctx, 0);
2903 /* transport_write_message() uses write() because it is called from other
2904 places to write to non-sockets. This means that under some OS (e.g. Solaris)
2905 it can exit with "Broken pipe" as its error. This really means that the
2906 socket got closed at the far end. */
2908 transport_write_timeout = 0; /* for subsequent transports */
2910 /* Failure can either be some kind of I/O disaster (including timeout),
2911 or the failure of a transport filter or the expansion of added headers.
2912 Or, when CHUNKING, it can be a protocol-detected failure. */
2915 if (message) goto SEND_FAILED;
2916 else goto RESPONSE_FAILED;
2918 /* We used to send the terminating "." explicitly here, but because of
2919 buffering effects at both ends of TCP/IP connections, you don't gain
2920 anything by keeping it separate, so it might as well go in the final
2921 data buffer for efficiency. This is now done by setting the topt_end_dot
2924 smtp_command = US"end of data";
2926 if (sx.peer_offered & PEER_OFFERED_CHUNKING && sx.cmd_count > 1)
2928 /* Reap any outstanding MAIL & RCPT commands, but not a DATA-go-ahead */
2929 switch(sync_responses(&sx, sx.cmd_count-1, 0))
2931 case 3: sx.ok = TRUE; /* 2xx & 5xx => OK & progress made */
2932 case 2: sx.completed_addr = TRUE; /* 5xx (only) => progress made */
2935 case 1: sx.ok = TRUE; /* 2xx (only) => OK, but if LMTP, */
2936 if (!sx.lmtp) sx.completed_addr = TRUE; /* can't tell about progress yet */
2937 case 0: break; /* No 2xx or 5xx, but no probs */
2939 case -1: goto END_OFF; /* Timeout on RCPT */
2940 default: goto RESPONSE_FAILED; /* I/O error, or any MAIL/DATA error */
2944 #ifndef DISABLE_PRDR
2945 /* For PRDR we optionally get a partial-responses warning
2946 * followed by the individual responses, before going on with
2947 * the overall response. If we don't get the warning then deal
2948 * with per non-PRDR. */
2951 sx.ok = smtp_read_response(&sx.inblock, sx.buffer, sizeof(sx.buffer), '3',
2952 sx.ob->final_timeout);
2953 if (!sx.ok && errno == 0) switch(sx.buffer[0])
2955 case '2': sx.prdr_active = FALSE;
2958 case '4': errno = ERRNO_DATA4XX;
2959 addrlist->more_errno |=
2960 ((sx.buffer[1] - '0')*10 + sx.buffer[2] - '0') << 8;
2967 /* For non-PRDR SMTP, we now read a single response that applies to the
2968 whole message. If it is OK, then all the addresses have been delivered. */
2972 sx.ok = smtp_read_response(&sx.inblock, sx.buffer, sizeof(sx.buffer), '2',
2973 sx.ob->final_timeout);
2974 if (!sx.ok && errno == 0 && sx.buffer[0] == '4')
2976 errno = ERRNO_DATA4XX;
2977 addrlist->more_errno |= ((sx.buffer[1] - '0')*10 + sx.buffer[2] - '0') << 8;
2981 /* For LMTP, we get back a response for every RCPT command that we sent;
2982 some may be accepted and some rejected. For those that get a response, their
2983 status is fixed; any that are accepted have been handed over, even if later
2984 responses crash - at least, that's how I read RFC 2033.
2986 If all went well, mark the recipient addresses as completed, record which
2987 host/IPaddress they were delivered to, and cut out RSET when sending another
2988 message down the same channel. Write the completed addresses to the journal
2989 now so that they are recorded in case there is a crash of hardware or
2990 software before the spool gets updated. Also record the final SMTP
2991 confirmation if needed (for SMTP only). */
2996 int delivery_time = (int)(time(NULL) - start_delivery_time);
2998 uschar *conf = NULL;
3000 sx.send_rset = FALSE;
3001 pipelining_active = FALSE;
3003 /* Set up confirmation if needed - applies only to SMTP */
3006 #ifdef DISABLE_EVENT
3007 LOGGING(smtp_confirmation) &&
3012 const uschar *s = string_printing(sx.buffer);
3013 /* deconst cast ok here as string_printing was checked to have alloc'n'copied */
3014 conf = (s == sx.buffer)? (uschar *)string_copy(s) : US s;
3017 /* Process all transported addresses - for LMTP or PRDR, read a status for
3020 for (addr = addrlist; addr != sx.first_addr; addr = addr->next)
3022 if (addr->transport_return != PENDING_OK) continue;
3024 /* LMTP - if the response fails badly (e.g. timeout), use it for all the
3025 remaining addresses. Otherwise, it's a return code for just the one
3026 address. For temporary errors, add a retry item for the address so that
3027 it doesn't get tried again too soon. */
3029 #ifndef DISABLE_PRDR
3030 if (sx.lmtp || sx.prdr_active)
3035 if (!smtp_read_response(&sx.inblock, sx.buffer, sizeof(sx.buffer), '2',
3036 sx.ob->final_timeout))
3038 if (errno != 0 || sx.buffer[0] == 0) goto RESPONSE_FAILED;
3039 addr->message = string_sprintf(
3040 #ifndef DISABLE_PRDR
3041 "%s error after %s: %s", sx.prdr_active ? "PRDR":"LMTP",
3043 "LMTP error after %s: %s",
3045 data_command, string_printing(sx.buffer));
3046 setflag(addr, af_pass_message); /* Allow message to go to user */
3047 if (sx.buffer[0] == '5')
3048 addr->transport_return = FAIL;
3051 errno = ERRNO_DATA4XX;
3052 addr->more_errno |= ((sx.buffer[1] - '0')*10 + sx.buffer[2] - '0') << 8;
3053 addr->transport_return = DEFER;
3054 #ifndef DISABLE_PRDR
3055 if (!sx.prdr_active)
3057 retry_add_item(addr, addr->address_retry_key, 0);
3061 sx.completed_addr = TRUE; /* NOW we can set this flag */
3062 if (LOGGING(smtp_confirmation))
3064 const uschar *s = string_printing(sx.buffer);
3065 /* deconst cast ok here as string_printing was checked to have alloc'n'copied */
3066 conf = (s == sx.buffer) ? US string_copy(s) : US s;
3070 /* SMTP, or success return from LMTP for this address. Pass back the
3071 actual host that was used. */
3073 addr->transport_return = OK;
3074 addr->more_errno = delivery_time;
3075 addr->host_used = host;
3076 addr->special_action = flag;
3077 addr->message = conf;
3078 #ifndef DISABLE_PRDR
3079 if (sx.prdr_active) addr->flags |= af_prdr_used;
3081 if (sx.peer_offered & PEER_OFFERED_CHUNKING) addr->flags |= af_chunking_used;
3084 #ifndef DISABLE_PRDR
3085 if (!sx.prdr_active)
3088 /* Update the journal. For homonymic addresses, use the base address plus
3089 the transport name. See lots of comments in deliver.c about the reasons
3090 for the complications when homonyms are involved. Just carry on after
3091 write error, as it may prove possible to update the spool file later. */
3093 if (testflag(addr, af_homonym))
3094 sprintf(CS sx.buffer, "%.500s/%s\n", addr->unique + 3, tblock->name);
3096 sprintf(CS sx.buffer, "%.500s\n", addr->unique);
3098 DEBUG(D_deliver) debug_printf("S:journalling %s\n", sx.buffer);
3099 len = Ustrlen(CS sx.buffer);
3100 if (write(journal_fd, sx.buffer, len) != len)
3101 log_write(0, LOG_MAIN|LOG_PANIC, "failed to write journal for "
3102 "%s: %s", sx.buffer, strerror(errno));
3106 #ifndef DISABLE_PRDR
3109 /* PRDR - get the final, overall response. For any non-success
3110 upgrade all the address statuses. */
3111 sx.ok = smtp_read_response(&sx.inblock, sx.buffer, sizeof(sx.buffer), '2',
3112 sx.ob->final_timeout);
3115 if(errno == 0 && sx.buffer[0] == '4')
3117 errno = ERRNO_DATA4XX;
3118 addrlist->more_errno |= ((sx.buffer[1] - '0')*10 + sx.buffer[2] - '0') << 8;
3120 for (addr = addrlist; addr != sx.first_addr; addr = addr->next)
3121 if (sx.buffer[0] == '5' || addr->transport_return == OK)
3122 addr->transport_return = PENDING_OK; /* allow set_errno action */
3123 goto RESPONSE_FAILED;
3126 /* Update the journal, or setup retry. */
3127 for (addr = addrlist; addr != sx.first_addr; addr = addr->next)
3128 if (addr->transport_return == OK)
3130 if (testflag(addr, af_homonym))
3131 sprintf(CS sx.buffer, "%.500s/%s\n", addr->unique + 3, tblock->name);
3133 sprintf(CS sx.buffer, "%.500s\n", addr->unique);
3135 DEBUG(D_deliver) debug_printf("journalling(PRDR) %s\n", sx.buffer);
3136 len = Ustrlen(CS sx.buffer);
3137 if (write(journal_fd, sx.buffer, len) != len)
3138 log_write(0, LOG_MAIN|LOG_PANIC, "failed to write journal for "
3139 "%s: %s", sx.buffer, strerror(errno));
3141 else if (addr->transport_return == DEFER)
3142 retry_add_item(addr, addr->address_retry_key, -2);
3146 /* Ensure the journal file is pushed out to disk. */
3148 if (EXIMfsync(journal_fd) < 0)
3149 log_write(0, LOG_MAIN|LOG_PANIC, "failed to fsync journal: %s",
3155 /* Handle general (not specific to one address) failures here. The value of ok
3156 is used to skip over this code on the falling through case. A timeout causes a
3157 deferral. Other errors may defer or fail according to the response code, and
3158 may set up a special errno value, e.g. after connection chopped, which is
3159 assumed if errno == 0 and there is no text in the buffer. If control reaches
3160 here during the setting up phase (i.e. before MAIL FROM) then always defer, as
3161 the problem is not related to this specific message. */
3166 uschar * set_message;
3172 sx.send_quit = check_response(host, &save_errno, addrlist->more_errno,
3173 sx.buffer, &code, &message, &pass_message);
3181 message = string_sprintf("send() to %s [%s] failed: %s",
3182 host->name, host->address, message ? message : US strerror(save_errno));
3183 sx.send_quit = FALSE;
3191 sx.ok = FALSE; /* For when reached by GOTO */
3192 set_message = message;
3194 /* We want to handle timeouts after MAIL or "." and loss of connection after
3195 "." specially. They can indicate a problem with the sender address or with
3196 the contents of the message rather than a real error on the connection. These
3197 cases are treated in the same way as a 4xx response. This next bit of code
3198 does the classification. */
3205 message_error = TRUE;
3209 message_error = Ustrncmp(smtp_command,"MAIL",4) == 0 ||
3210 Ustrncmp(smtp_command,"end ",4) == 0;
3213 case ERRNO_SMTPCLOSED:
3214 message_error = Ustrncmp(smtp_command,"end ",4) == 0;
3218 message_error = FALSE;
3222 /* Handle the cases that are treated as message errors. These are:
3224 (a) negative response or timeout after MAIL
3225 (b) negative response after DATA
3226 (c) negative response or timeout or dropped connection after "."
3227 (d) utf8 support required and not offered
3229 It won't be a negative response or timeout after RCPT, as that is dealt
3230 with separately above. The action in all cases is to set an appropriate
3231 error code for all the addresses, but to leave yield set to OK because the
3232 host itself has not failed. Of course, it might in practice have failed
3233 when we've had a timeout, but if so, we'll discover that at the next
3234 delivery attempt. For a temporary error, set the message_defer flag, and
3235 write to the logs for information if this is not the last host. The error
3236 for the last host will be logged as part of the address's log line. */
3240 if (mua_wrapper) code = '5'; /* Force hard failure in wrapper mode */
3242 /* If there's an errno, the message contains just the identity of
3247 else /* Anything other than 5 is treated as temporary */
3251 message = US string_sprintf("%s: %s", message, strerror(save_errno));
3252 if (host->next != NULL) log_write(0, LOG_MAIN, "%s", message);
3253 msglog_line(host, message);
3254 *message_defer = TRUE;
3258 /* Otherwise, we have an I/O error or a timeout other than after MAIL or
3259 ".", or some other transportation error. We defer all addresses and yield
3260 DEFER, except for the case of failed add_headers expansion, or a transport
3261 filter failure, when the yield should be ERROR, to stop it trying other
3267 yield = (save_errno == ERRNO_CHHEADER_FAIL ||
3268 save_errno == ERRNO_FILTER_FAIL)? ERROR : DEFER;
3272 set_errno(addrlist, save_errno, set_message, set_rc, pass_message, host
3273 #ifdef EXPERIMENTAL_DSN_INFO
3274 , sx.smtp_greeting, sx.helo_response
3280 /* If all has gone well, send_quit will be set TRUE, implying we can end the
3281 SMTP session tidily. However, if there were too many addresses to send in one
3282 message (indicated by first_addr being non-NULL) we want to carry on with the
3283 rest of them. Also, it is desirable to send more than one message down the SMTP
3284 connection if there are several waiting, provided we haven't already sent so
3285 many as to hit the configured limit. The function transport_check_waiting looks
3286 for a waiting message and returns its id. Then transport_pass_socket tries to
3287 set up a continued delivery by passing the socket on to another process. The
3288 variable send_rset is FALSE if a message has just been successfully transfered.
3290 If we are already sending down a continued channel, there may be further
3291 addresses not yet delivered that are aimed at the same host, but which have not
3292 been passed in this run of the transport. In this case, continue_more will be
3293 true, and all we should do is send RSET if necessary, and return, leaving the
3296 However, if no address was disposed of, i.e. all addresses got 4xx errors, we
3297 do not want to continue with other messages down the same channel, because that
3298 can lead to looping between two or more messages, all with the same,
3299 temporarily failing address(es). [The retry information isn't updated yet, so
3300 new processes keep on trying.] We probably also don't want to try more of this
3301 message's addresses either.
3303 If we have started a TLS session, we have to end it before passing the
3304 connection to a new process. However, not all servers can handle this (Exim
3305 can), so we do not pass such a connection on if the host matches
3306 hosts_nopass_tls. */
3309 debug_printf("ok=%d send_quit=%d send_rset=%d continue_more=%d "
3310 "yield=%d first_address is %sNULL\n", sx.ok, sx.send_quit,
3311 sx.send_rset, continue_more, yield, sx.first_addr ? "not " : "");
3313 if (sx.completed_addr && sx.ok && sx.send_quit)
3316 smtp_compare_t t_compare;
3318 t_compare.tblock = tblock;
3319 t_compare.current_sender_address = sender_address;
3321 if ( sx.first_addr != NULL
3325 ( tls_out.active < 0 && !continue_proxy_cipher
3326 || verify_check_given_host(&sx.ob->hosts_nopass_tls, host) != OK
3330 transport_check_waiting(tblock->name, host->name,
3331 tblock->connection_max_messages, new_message_id, &more,
3332 (oicf)smtp_are_same_identities, (void*)&t_compare)
3339 if (! (sx.ok = smtp_write_command(&sx.outblock, SCMD_FLUSH, "RSET\r\n") >= 0))
3341 msg = US string_sprintf("send() to %s [%s] failed: %s", host->name,
3342 host->address, strerror(errno));
3343 sx.send_quit = FALSE;
3345 else if (! (sx.ok = smtp_read_response(&sx.inblock, sx.buffer,
3346 sizeof(sx.buffer), '2', sx.ob->command_timeout)))
3349 sx.send_quit = check_response(host, &errno, 0, sx.buffer, &code, &msg,
3353 DEBUG(D_transport) debug_printf("H=%s [%s] %s\n",
3354 host->name, host->address, msg);
3358 /* Either RSET was not needed, or it succeeded */
3363 int socket_fd = sx.inblock.sock;
3366 if (sx.first_addr != NULL) /* More addresses still to be sent */
3367 { /* in this run of the transport */
3368 continue_sequence++; /* Causes * in logging */
3372 /* Unless caller said it already has more messages listed for this host,
3373 pass the connection on to a new Exim process (below, the call to
3374 transport_pass_socket). If the caller has more ready, just return with
3375 the connection still open. */
3378 if (tls_out.active >= 0)
3380 || verify_check_given_host(&sx.ob->hosts_noproxy_tls, host) == OK)
3382 /* Before passing the socket on, or returning to caller with it still
3383 open, we must shut down TLS. Not all MTAs allow for the continuation
3384 of the SMTP session when TLS is shut down. We test for this by sending
3385 a new EHLO. If we don't get a good response, we don't attempt to pass
3388 tls_close(FALSE, TRUE);
3389 smtp_peer_options = smtp_peer_options_wrap;
3391 && smtp_write_command(&sx.outblock, SCMD_FLUSH,
3392 "EHLO %s\r\n", sx.helo_data) >= 0
3393 && smtp_read_response(&sx.inblock, sx.buffer, sizeof(sx.buffer),
3394 '2', sx.ob->command_timeout);
3396 if (sx.ok && continue_more)
3397 return yield; /* More addresses for another run */
3401 /* Set up a pipe for proxying TLS for the new transport process */
3403 smtp_peer_options |= PEER_OFFERED_TLS;
3404 if (sx.ok = (socketpair(AF_UNIX, SOCK_STREAM, 0, pfd) == 0))
3407 set_errno(sx.first_addr, errno, US"internal allocation problem",
3409 # ifdef EXPERIMENTAL_DSN_INFO
3410 , sx.smtp_greeting, sx.helo_response
3417 return yield; /* More addresses for another run */
3419 /* If the socket is successfully passed, we mustn't send QUIT (or
3420 indeed anything!) from here. */
3422 /*XXX DSN_INFO: assume likely to do new HELO; but for greet we'll want to
3423 propagate it from the initial
3425 if (sx.ok && transport_pass_socket(tblock->name, host->name,
3426 host->address, new_message_id, socket_fd))
3428 sx.send_quit = FALSE;
3430 /* If TLS is still active, we need to proxy it for the transport we
3431 just passed the baton to. Fork a child to to do it, and return to
3432 get logging done asap. Which way to place the work makes assumptions
3433 about post-fork prioritisation which may not hold on all platforms. */
3435 if (tls_out.active >= 0)
3438 if (pid > 0) /* parent */
3440 DEBUG(D_transport) debug_printf("proxy-proc inter-pid %d\n", pid);
3441 waitpid(pid, NULL, 0);
3442 tls_close(FALSE, FALSE);
3443 (void)close(sx.inblock.sock);
3444 continue_transport = NULL;
3445 continue_hostname = NULL;
3448 else if (pid == 0) /* child; fork again to disconnect totally */
3452 DEBUG(D_transport) debug_printf("proxy-prox final-pid %d\n", pid);
3453 _exit(pid ? EXIT_FAILURE : EXIT_SUCCESS);
3455 smtp_proxy_tls(sx.buffer, sizeof(sx.buffer), pfd[0], sx.ob->command_timeout);
3463 /* If RSET failed and there are addresses left, they get deferred. */
3465 set_errno(sx.first_addr, errno, msg, DEFER, FALSE, host
3466 #ifdef EXPERIMENTAL_DSN_INFO
3467 , sx.smtp_greeting, sx.helo_response
3473 /* End off tidily with QUIT unless the connection has died or the socket has
3474 been passed to another process. There has been discussion on the net about what
3475 to do after sending QUIT. The wording of the RFC suggests that it is necessary
3476 to wait for a response, but on the other hand, there isn't anything one can do
3477 with an error response, other than log it. Exim used to do that. However,
3478 further discussion suggested that it is positively advantageous not to wait for
3479 the response, but to close the session immediately. This is supposed to move
3480 the TCP/IP TIME_WAIT state from the server to the client, thereby removing some
3481 load from the server. (Hosts that are both servers and clients may not see much
3482 difference, of course.) Further discussion indicated that this was safe to do
3483 on Unix systems which have decent implementations of TCP/IP that leave the
3484 connection around for a while (TIME_WAIT) after the application has gone away.
3485 This enables the response sent by the server to be properly ACKed rather than
3486 timed out, as can happen on broken TCP/IP implementations on other OS.
3488 This change is being made on 31-Jul-98. After over a year of trouble-free
3489 operation, the old commented-out code was removed on 17-Sep-99. */
3492 if (sx.send_quit) (void)smtp_write_command(&sx.outblock, SCMD_FLUSH, "QUIT\r\n");
3497 tls_close(FALSE, TRUE);
3500 /* Close the socket, and return the appropriate value, first setting
3501 works because the NULL setting is passed back to the calling process, and
3502 remote_max_parallel is forced to 1 when delivering over an existing connection,
3504 If all went well and continue_more is set, we shouldn't actually get here if
3505 there are further addresses, as the return above will be taken. However,
3506 writing RSET might have failed, or there may be other addresses whose hosts are
3507 specified in the transports, and therefore not visible at top level, in which
3508 case continue_more won't get set. */
3510 HDEBUG(D_transport|D_acl|D_v) debug_printf_indent(" SMTP(close)>>\n");
3513 shutdown(sx.outblock.sock, SHUT_WR);
3514 if (fcntl(sx.inblock.sock, F_SETFL, O_NONBLOCK) == 0)
3515 for (rc = 16; read(sx.inblock.sock, sx.inbuffer, sizeof(sx.inbuffer)) > 0 && rc > 0;)
3516 rc--; /* drain socket */
3518 (void)close(sx.inblock.sock);
3520 #ifndef DISABLE_EVENT
3521 (void) event_raise(tblock->event_action, US"tcp:close", NULL);
3524 continue_transport = NULL;
3525 continue_hostname = NULL;
3532 /*************************************************
3533 * Closedown entry point *
3534 *************************************************/
3536 /* This function is called when exim is passed an open smtp channel
3537 from another incarnation, but the message which it has been asked
3538 to deliver no longer exists. The channel is on stdin.
3540 We might do fancy things like looking for another message to send down
3541 the channel, but if the one we sought has gone, it has probably been
3542 delivered by some other process that itself will seek further messages,
3543 so just close down our connection.
3545 Argument: pointer to the transport instance block
3550 smtp_transport_closedown(transport_instance *tblock)
3552 smtp_transport_options_block *ob =
3553 (smtp_transport_options_block *)tblock->options_block;
3554 smtp_inblock inblock;
3555 smtp_outblock outblock;
3557 uschar inbuffer[4096];
3558 uschar outbuffer[16];
3560 inblock.sock = fileno(stdin);
3561 inblock.buffer = inbuffer;
3562 inblock.buffersize = sizeof(inbuffer);
3563 inblock.ptr = inbuffer;
3564 inblock.ptrend = inbuffer;
3566 outblock.sock = inblock.sock;
3567 outblock.buffersize = sizeof(outbuffer);
3568 outblock.buffer = outbuffer;
3569 outblock.ptr = outbuffer;
3570 outblock.cmd_count = 0;
3571 outblock.authenticating = FALSE;
3573 (void)smtp_write_command(&outblock, SCMD_FLUSH, "QUIT\r\n");
3574 (void)smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
3575 ob->command_timeout);
3576 (void)close(inblock.sock);
3581 /*************************************************
3582 * Prepare addresses for delivery *
3583 *************************************************/
3585 /* This function is called to flush out error settings from previous delivery
3586 attempts to other hosts. It also records whether we got here via an MX record
3587 or not in the more_errno field of the address. We are interested only in
3588 addresses that are still marked DEFER - others may have got delivered to a
3589 previously considered IP address. Set their status to PENDING_DEFER to indicate
3590 which ones are relevant this time.
3593 addrlist the list of addresses
3594 host the host we are delivering to
3596 Returns: the first address for this delivery
3599 static address_item *
3600 prepare_addresses(address_item *addrlist, host_item *host)
3602 address_item *first_addr = NULL;
3604 for (addr = addrlist; addr; addr = addr->next)
3605 if (addr->transport_return == DEFER)
3607 if (!first_addr) first_addr = addr;
3608 addr->transport_return = PENDING_DEFER;
3609 addr->basic_errno = 0;
3610 addr->more_errno = (host->mx >= 0)? 'M' : 'A';
3611 addr->message = NULL;
3613 addr->cipher = NULL;
3614 addr->ourcert = NULL;
3615 addr->peercert = NULL;
3616 addr->peerdn = NULL;
3617 addr->ocsp = OCSP_NOT_REQ;
3619 #ifdef EXPERIMENTAL_DSN_INFO
3620 addr->smtp_greeting = NULL;
3621 addr->helo_response = NULL;
3629 /*************************************************
3630 * Main entry point *
3631 *************************************************/
3633 /* See local README for interface details. As this is a remote transport, it is
3634 given a chain of addresses to be delivered in one connection, if possible. It
3635 always returns TRUE, indicating that each address has its own independent
3636 status set, except if there is a setting up problem, in which case it returns
3640 smtp_transport_entry(
3641 transport_instance *tblock, /* data for this instantiation */
3642 address_item *addrlist) /* addresses we are working on */
3646 int hosts_defer = 0;
3648 int hosts_looked_up = 0;
3649 int hosts_retry = 0;
3650 int hosts_serial = 0;
3651 int hosts_total = 0;
3652 int total_hosts_tried = 0;
3654 BOOL expired = TRUE;
3655 uschar *expanded_hosts = NULL;
3657 uschar *tid = string_sprintf("%s transport", tblock->name);
3658 smtp_transport_options_block *ob =
3659 (smtp_transport_options_block *)(tblock->options_block);
3660 host_item *hostlist = addrlist->host_list;
3661 host_item *host = NULL;
3665 debug_printf("%s transport entered\n", tblock->name);
3666 for (addr = addrlist; addr; addr = addr->next)
3667 debug_printf(" %s\n", addr->address);
3670 debug_printf("hostlist:\n");
3671 for (host = hostlist; host; host = host->next)
3672 debug_printf(" %s:%d\n", host->name, host->port);
3674 if (continue_hostname)
3675 debug_printf("already connected to %s [%s] (on fd %d)\n",
3676 continue_hostname, continue_host_address,
3677 cutthrough.fd >= 0 ? cutthrough.fd : 0);
3680 /* Set the flag requesting that these hosts be added to the waiting
3681 database if the delivery fails temporarily or if we are running with
3682 queue_smtp or a 2-stage queue run. This gets unset for certain
3683 kinds of error, typically those that are specific to the message. */
3685 update_waiting = TRUE;
3687 /* If a host list is not defined for the addresses - they must all have the
3688 same one in order to be passed to a single transport - or if the transport has
3689 a host list with hosts_override set, use the host list supplied with the
3690 transport. It is an error for this not to exist. */
3692 if (!hostlist || (ob->hosts_override && ob->hosts))
3696 addrlist->message = string_sprintf("%s transport called with no hosts set",
3698 addrlist->transport_return = PANIC;
3699 return FALSE; /* Only top address has status */
3702 DEBUG(D_transport) debug_printf("using the transport's hosts: %s\n",
3705 /* If the transport's host list contains no '$' characters, and we are not
3706 randomizing, it is fixed and therefore a chain of hosts can be built once
3707 and for all, and remembered for subsequent use by other calls to this
3708 transport. If, on the other hand, the host list does contain '$', or we are
3709 randomizing its order, we have to rebuild it each time. In the fixed case,
3710 as the hosts string will never be used again, it doesn't matter that we
3711 replace all the : characters with zeros. */
3715 uschar *s = ob->hosts;
3717 if (Ustrchr(s, '$') != NULL)
3719 if (!(expanded_hosts = expand_string(s)))
3721 addrlist->message = string_sprintf("failed to expand list of hosts "
3722 "\"%s\" in %s transport: %s", s, tblock->name, expand_string_message);
3723 addrlist->transport_return = search_find_defer ? DEFER : PANIC;
3724 return FALSE; /* Only top address has status */
3726 DEBUG(D_transport) debug_printf("expanded list of hosts \"%s\" to "
3727 "\"%s\"\n", s, expanded_hosts);
3731 if (ob->hosts_randomize) s = expanded_hosts = string_copy(s);
3733 host_build_hostlist(&hostlist, s, ob->hosts_randomize);
3735 /* Check that the expansion yielded something useful. */
3739 string_sprintf("%s transport has empty hosts setting", tblock->name);
3740 addrlist->transport_return = PANIC;
3741 return FALSE; /* Only top address has status */
3744 /* If there was no expansion of hosts, save the host list for
3747 if (!expanded_hosts) ob->hostlist = hostlist;
3750 /* This is not the first time this transport has been run in this delivery;
3751 the host list was built previously. */
3754 hostlist = ob->hostlist;
3757 /* The host list was supplied with the address. If hosts_randomize is set, we
3758 must sort it into a random order if it did not come from MX records and has not
3759 already been randomized (but don't bother if continuing down an existing
3762 else if (ob->hosts_randomize && hostlist->mx == MX_NONE && !continue_hostname)
3764 host_item *newlist = NULL;
3767 host_item *h = hostlist;
3768 hostlist = hostlist->next;
3770 h->sort_key = random_number(100);
3777 else if (h->sort_key < newlist->sort_key)
3784 host_item *hh = newlist;
3787 if (h->sort_key < hh->next->sort_key) break;
3795 hostlist = addrlist->host_list = newlist;
3798 /* Sort out the default port. */
3800 if (!smtp_get_port(ob->port, addrlist, &port, tid)) return FALSE;
3802 /* For each host-plus-IP-address on the list:
3804 . If this is a continued delivery and the host isn't the one with the
3805 current connection, skip.
3807 . If the status is unusable (i.e. previously failed or retry checked), skip.
3809 . If no IP address set, get the address, either by turning the name into
3810 an address, calling gethostbyname if gethostbyname is on, or by calling
3811 the DNS. The DNS may yield multiple addresses, in which case insert the
3812 extra ones into the list.
3814 . Get the retry data if not previously obtained for this address and set the
3815 field which remembers the state of this address. Skip if the retry time is
3816 not reached. If not, remember whether retry data was found. The retry string
3817 contains both the name and the IP address.
3819 . Scan the list of addresses and mark those whose status is DEFER as
3820 PENDING_DEFER. These are the only ones that will be processed in this cycle
3823 . Make a delivery attempt - addresses marked PENDING_DEFER will be tried.
3824 Some addresses may be successfully delivered, others may fail, and yet
3825 others may get temporary errors and so get marked DEFER.
3827 . The return from the delivery attempt is OK if a connection was made and a
3828 valid SMTP dialogue was completed. Otherwise it is DEFER.
3830 . If OK, add a "remove" retry item for this host/IPaddress, if any.
3832 . If fail to connect, or other defer state, add a retry item.
3834 . If there are any addresses whose status is still DEFER, carry on to the
3835 next host/IPaddress, unless we have tried the number of hosts given
3836 by hosts_max_try or hosts_max_try_hardlimit; otherwise return. Note that
3837 there is some fancy logic for hosts_max_try that means its limit can be
3838 overstepped in some circumstances.
3840 If we get to the end of the list, all hosts have deferred at least one address,
3841 or not reached their retry times. If delay_after_cutoff is unset, it requests a
3842 delivery attempt to those hosts whose last try was before the arrival time of
3843 the current message. To cope with this, we have to go round the loop a second
3844 time. After that, set the status and error data for any addresses that haven't
3845 had it set already. */
3847 for (cutoff_retry = 0;
3848 expired && cutoff_retry < (ob->delay_after_cutoff ? 1 : 2);
3851 host_item *nexthost = NULL;
3852 int unexpired_hosts_tried = 0;
3854 for (host = hostlist;
3856 && unexpired_hosts_tried < ob->hosts_max_try
3857 && total_hosts_tried < ob->hosts_max_try_hardlimit;
3863 BOOL host_is_expired = FALSE;
3864 BOOL message_defer = FALSE;
3865 BOOL some_deferred = FALSE;
3866 address_item *first_addr = NULL;
3867 uschar *interface = NULL;
3868 uschar *retry_host_key = NULL;
3869 uschar *retry_message_key = NULL;
3870 uschar *serialize_key = NULL;
3872 /* Default next host is next host. :-) But this can vary if the
3873 hosts_max_try limit is hit (see below). It may also be reset if a host
3874 address is looked up here (in case the host was multihomed). */
3876 nexthost = host->next;
3878 /* If the address hasn't yet been obtained from the host name, look it up
3879 now, unless the host is already marked as unusable. If it is marked as
3880 unusable, it means that the router was unable to find its IP address (in
3881 the DNS or wherever) OR we are in the 2nd time round the cutoff loop, and
3882 the lookup failed last time. We don't get this far if *all* MX records
3883 point to non-existent hosts; that is treated as a hard error.
3885 We can just skip this host entirely. When the hosts came from the router,
3886 the address will timeout based on the other host(s); when the address is
3887 looked up below, there is an explicit retry record added.
3889 Note that we mustn't skip unusable hosts if the address is not unset; they
3890 may be needed as expired hosts on the 2nd time round the cutoff loop. */
3894 int new_port, flags;
3897 if (host->status >= hstatus_unusable)
3899 DEBUG(D_transport) debug_printf("%s has no address and is unusable - skipping\n",
3904 DEBUG(D_transport) debug_printf("getting address for %s\n", host->name);
3906 /* The host name is permitted to have an attached port. Find it, and
3907 strip it from the name. Just remember it for now. */
3909 new_port = host_item_get_port(host);
3911 /* Count hosts looked up */
3915 /* Find by name if so configured, or if it's an IP address. We don't
3916 just copy the IP address, because we need the test-for-local to happen. */
3918 flags = HOST_FIND_BY_A;
3919 if (ob->dns_qualify_single) flags |= HOST_FIND_QUALIFY_SINGLE;
3920 if (ob->dns_search_parents) flags |= HOST_FIND_SEARCH_PARENTS;
3922 if (ob->gethostbyname || string_is_ip_address(host->name, NULL) != 0)
3923 rc = host_find_byname(host, NULL, flags, NULL, TRUE);
3925 rc = host_find_bydns(host, NULL, flags, NULL, NULL, NULL,
3926 &ob->dnssec, /* domains for request/require */
3929 /* Update the host (and any additional blocks, resulting from
3930 multihoming) with a host-specific port, if any. */
3932 for (hh = host; hh != nexthost; hh = hh->next) hh->port = new_port;
3934 /* Failure to find the host at this time (usually DNS temporary failure)
3935 is really a kind of routing failure rather than a transport failure.
3936 Therefore we add a retry item of the routing kind, not to stop us trying
3937 to look this name up here again, but to ensure the address gets timed
3938 out if the failures go on long enough. A complete failure at this point
3939 commonly points to a configuration error, but the best action is still
3940 to carry on for the next host. */
3942 if (rc == HOST_FIND_AGAIN || rc == HOST_FIND_SECURITY || rc == HOST_FIND_FAILED)
3944 retry_add_item(addrlist, string_sprintf("R:%s", host->name), 0);
3946 if (rc == HOST_FIND_AGAIN) hosts_defer++; else hosts_fail++;
3947 DEBUG(D_transport) debug_printf("rc = %s for %s\n", (rc == HOST_FIND_AGAIN)?
3948 "HOST_FIND_AGAIN" : "HOST_FIND_FAILED", host->name);
3949 host->status = hstatus_unusable;
3951 for (addr = addrlist; addr; addr = addr->next)
3953 if (addr->transport_return != DEFER) continue;
3954 addr->basic_errno = ERRNO_UNKNOWNHOST;
3955 addr->message = string_sprintf(
3956 rc == HOST_FIND_SECURITY
3957 ? "lookup of IP address for %s was insecure"
3958 : "failed to lookup IP address for %s",
3964 /* If the host is actually the local host, we may have a problem, or
3965 there may be some cunning configuration going on. In the problem case,
3966 log things and give up. The default transport status is already DEFER. */
3968 if (rc == HOST_FOUND_LOCAL && !ob->allow_localhost)
3970 for (addr = addrlist; addr; addr = addr->next)
3972 addr->basic_errno = 0;
3973 addr->message = string_sprintf("%s transport found host %s to be "
3974 "local", tblock->name, host->name);
3978 } /* End of block for IP address lookup */
3980 /* If this is a continued delivery, we are interested only in the host
3981 which matches the name of the existing open channel. The check is put
3982 here after the local host lookup, in case the name gets expanded as a
3983 result of the lookup. Set expired FALSE, to save the outer loop executing
3986 if ( continue_hostname
3987 && ( Ustrcmp(continue_hostname, host->name) != 0
3988 || Ustrcmp(continue_host_address, host->address) != 0
3992 continue; /* With next host */
3995 /* Reset the default next host in case a multihomed host whose addresses
3996 are not looked up till just above added to the host list. */
3998 nexthost = host->next;
4000 /* If queue_smtp is set (-odqs or the first part of a 2-stage run), or the
4001 domain is in queue_smtp_domains, we don't actually want to attempt any
4002 deliveries. When doing a queue run, queue_smtp_domains is always unset. If
4003 there is a lookup defer in queue_smtp_domains, proceed as if the domain
4004 were not in it. We don't want to hold up all SMTP deliveries! Except when
4005 doing a two-stage queue run, don't do this if forcing. */
4007 if ((!deliver_force || queue_2stage) && (queue_smtp ||
4008 match_isinlist(addrlist->domain,
4009 (const uschar **)&queue_smtp_domains, 0,
4010 &domainlist_anchor, NULL, MCL_DOMAIN, TRUE, NULL) == OK))
4013 for (addr = addrlist; addr; addr = addr->next)
4014 if (addr->transport_return == DEFER)
4015 addr->message = US"domain matches queue_smtp_domains, or -odqs set";
4016 continue; /* With next host */
4019 /* Count hosts being considered - purely for an intelligent comment
4020 if none are usable. */
4024 /* Set $host and $host address now in case they are needed for the
4025 interface expansion or the serialize_hosts check; they remain set if an
4026 actual delivery happens. */
4028 deliver_host = host->name;
4029 deliver_host_address = host->address;
4030 lookup_dnssec_authenticated = host->dnssec == DS_YES ? US"yes"
4031 : host->dnssec == DS_NO ? US"no"
4034 /* Set up a string for adding to the retry key if the port number is not
4035 the standard SMTP port. A host may have its own port setting that overrides
4038 pistring = string_sprintf(":%d", host->port == PORT_NONE
4039 ? port : host->port);
4040 if (Ustrcmp(pistring, ":25") == 0) pistring = US"";
4042 /* Select IPv4 or IPv6, and choose an outgoing interface. If the interface
4043 string is set, even if constant (as different transports can have different
4044 constant settings), we must add it to the key that is used for retries,
4045 because connections to the same host from a different interface should be
4046 treated separately. */
4048 host_af = Ustrchr(host->address, ':') == NULL ? AF_INET : AF_INET6;
4049 if ((rs = ob->interface) && *rs)
4051 if (!smtp_get_interface(rs, host_af, addrlist, &interface, tid))
4053 pistring = string_sprintf("%s/%s", pistring, interface);
4056 /* The first time round the outer loop, check the status of the host by
4057 inspecting the retry data. The second time round, we are interested only
4058 in expired hosts that haven't been tried since this message arrived. */
4060 if (cutoff_retry == 0)
4063 /* Ensure the status of the address is set by checking retry data if
4064 necessary. There may be host-specific retry data (applicable to all
4065 messages) and also data for retries of a specific message at this host.
4066 If either of these retry records are actually read, the keys used are
4067 returned to save recomputing them later. */
4069 if (exp_bool(addrlist, US"transport", tblock->name, D_transport,
4070 US"retry_include_ip_address", ob->retry_include_ip_address,
4071 ob->expand_retry_include_ip_address, &incl_ip) != OK)
4072 continue; /* with next host */
4074 host_is_expired = retry_check_address(addrlist->domain, host, pistring,
4075 incl_ip, &retry_host_key, &retry_message_key);
4077 DEBUG(D_transport) debug_printf("%s [%s]%s retry-status = %s\n", host->name,
4078 (host->address == NULL)? US"" : host->address, pistring,
4079 (host->status == hstatus_usable)? "usable" :
4080 (host->status == hstatus_unusable)? "unusable" :
4081 (host->status == hstatus_unusable_expired)? "unusable (expired)" : "?");
4083 /* Skip this address if not usable at this time, noting if it wasn't
4084 actually expired, both locally and in the address. */
4086 switch (host->status)
4088 case hstatus_unusable:
4090 setflag(addrlist, af_retry_skipped);
4093 case hstatus_unusable_expired:
4096 case hwhy_retry: hosts_retry++; break;
4097 case hwhy_failed: hosts_fail++; break;
4099 case hwhy_deferred: hosts_defer++; break;
4102 /* If there was a retry message key, implying that previously there
4103 was a message-specific defer, we don't want to update the list of
4104 messages waiting for these hosts. */
4106 if (retry_message_key) update_waiting = FALSE;
4107 continue; /* With the next host or IP address */
4111 /* Second time round the loop: if the address is set but expired, and
4112 the message is newer than the last try, let it through. */
4117 || host->status != hstatus_unusable_expired
4118 || host->last_try > received_time)
4120 DEBUG(D_transport) debug_printf("trying expired host %s [%s]%s\n",
4121 host->name, host->address, pistring);
4122 host_is_expired = TRUE;
4125 /* Setting "expired=FALSE" doesn't actually mean not all hosts are expired;
4126 it remains TRUE only if all hosts are expired and none are actually tried.
4131 /* If this host is listed as one to which access must be serialized,
4132 see if another Exim process has a connection to it, and if so, skip
4133 this host. If not, update the database to record our connection to it
4134 and remember this for later deletion. Do not do any of this if we are
4135 sending the message down a pre-existing connection. */
4137 if ( !continue_hostname
4138 && verify_check_given_host(&ob->serialize_hosts, host) == OK)
4140 serialize_key = string_sprintf("host-serialize-%s", host->name);
4141 if (!enq_start(serialize_key, 1))
4144 debug_printf("skipping host %s because another Exim process "
4145 "is connected to it\n", host->name);
4151 /* OK, we have an IP address that is not waiting for its retry time to
4152 arrive (it might be expired) OR (second time round the loop) we have an
4153 expired host that hasn't been tried since the message arrived. Have a go
4154 at delivering the message to it. First prepare the addresses by flushing
4155 out the result of previous attempts, and finding the first address that
4156 is still to be delivered. */
4158 first_addr = prepare_addresses(addrlist, host);
4160 DEBUG(D_transport) debug_printf("delivering %s to %s [%s] (%s%s)\n",
4161 message_id, host->name, host->address, addrlist->address,
4162 addrlist->next ? ", ..." : "");
4164 set_process_info("delivering %s to %s [%s] (%s%s)",
4165 message_id, host->name, host->address, addrlist->address,
4166 addrlist->next ? ", ..." : "");
4168 /* This is not for real; don't do the delivery. If there are
4169 any remaining hosts, list them. */
4174 set_errno_nohost(addrlist, 0, NULL, OK, FALSE);
4175 for (addr = addrlist; addr; addr = addr->next)
4177 addr->host_used = host;
4178 addr->special_action = '*';
4179 addr->message = US"delivery bypassed by -N option";
4183 debug_printf("*** delivery by %s transport bypassed by -N option\n"
4184 "*** host and remaining hosts:\n", tblock->name);
4185 for (host2 = host; host2; host2 = host2->next)
4186 debug_printf(" %s [%s]\n", host2->name,
4187 host2->address ? host2->address : US"unset");
4192 /* This is for real. If the host is expired, we don't count it for
4193 hosts_max_retry. This ensures that all hosts must expire before an address
4194 is timed out, unless hosts_max_try_hardlimit (which protects against
4195 lunatic DNS configurations) is reached.
4197 If the host is not expired and we are about to hit the hosts_max_retry
4198 limit, check to see if there is a subsequent hosts with a different MX
4199 value. If so, make that the next host, and don't count this one. This is a
4200 heuristic to make sure that different MXs do get tried. With a normal kind
4201 of retry rule, they would get tried anyway when the earlier hosts were
4202 delayed, but if the domain has a "retry every time" type of rule - as is
4203 often used for the the very large ISPs, that won't happen. */
4208 /* Make a copy of the host if it is local to this invocation
4209 of the transport. */
4213 thost = store_get(sizeof(host_item));
4215 thost->name = string_copy(host->name);
4216 thost->address = string_copy(host->address);
4221 if (!host_is_expired && ++unexpired_hosts_tried >= ob->hosts_max_try)
4225 debug_printf("hosts_max_try limit reached with this host\n");
4226 for (h = host; h; h = h->next) if (h->mx != host->mx)
4229 unexpired_hosts_tried--;
4230 DEBUG(D_transport) debug_printf("however, a higher MX host exists "
4231 "and will be tried\n");
4236 /* Attempt the delivery. */
4238 total_hosts_tried++;
4239 rc = smtp_deliver(addrlist, thost, host_af, port, interface, tblock,
4240 &message_defer, FALSE);
4243 OK => connection made, each address contains its result;
4244 message_defer is set for message-specific defers (when all
4245 recipients are marked defer)
4246 DEFER => there was a non-message-specific delivery problem;
4247 ERROR => there was a problem setting up the arguments for a filter,
4248 or there was a problem with expanding added headers
4251 /* If the result is not OK, there was a non-message-specific problem.
4252 If the result is DEFER, we need to write to the logs saying what happened
4253 for this particular host, except in the case of authentication and TLS
4254 failures, where the log has already been written. If all hosts defer a
4255 general message is written at the end. */
4257 if (rc == DEFER && first_addr->basic_errno != ERRNO_AUTHFAIL
4258 && first_addr->basic_errno != ERRNO_TLSFAILURE)
4259 write_logs(first_addr, host);
4261 #ifndef DISABLE_EVENT
4263 deferred_event_raise(first_addr, host);
4266 /* If STARTTLS was accepted, but there was a failure in setting up the
4267 TLS session (usually a certificate screwup), and the host is not in
4268 hosts_require_tls, and tls_tempfail_tryclear is true, try again, with
4269 TLS forcibly turned off. We have to start from scratch with a new SMTP
4270 connection. That's why the retry is done from here, not from within
4271 smtp_deliver(). [Rejections of STARTTLS itself don't screw up the
4272 session, so the in-clear transmission after those errors, if permitted,
4273 happens inside smtp_deliver().] */
4277 && first_addr->basic_errno == ERRNO_TLSFAILURE
4278 && ob->tls_tempfail_tryclear
4279 && verify_check_given_host(&ob->hosts_require_tls, host) != OK
4282 log_write(0, LOG_MAIN,
4283 "%s: delivering unencrypted to H=%s [%s] (not in hosts_require_tls)",
4284 first_addr->message, host->name, host->address);
4285 first_addr = prepare_addresses(addrlist, host);
4286 rc = smtp_deliver(addrlist, thost, host_af, port, interface, tblock,
4287 &message_defer, TRUE);
4288 if (rc == DEFER && first_addr->basic_errno != ERRNO_AUTHFAIL)
4289 write_logs(first_addr, host);
4290 # ifndef DISABLE_EVENT
4292 deferred_event_raise(first_addr, host);
4295 #endif /*SUPPORT_TLS*/
4298 /* Delivery attempt finished */
4300 rs = rc == OK ? US"OK"
4301 : rc == DEFER ? US"DEFER"
4302 : rc == ERROR ? US"ERROR"
4305 set_process_info("delivering %s: just tried %s [%s] for %s%s: result %s",
4306 message_id, host->name, host->address, addrlist->address,
4307 addrlist->next ? " (& others)" : "", rs);
4309 /* Release serialization if set up */
4311 if (serialize_key) enq_end(serialize_key);
4313 /* If the result is DEFER, or if a host retry record is known to exist, we
4314 need to add an item to the retry chain for updating the retry database
4315 at the end of delivery. We only need to add the item to the top address,
4316 of course. Also, if DEFER, we mark the IP address unusable so as to skip it
4317 for any other delivery attempts using the same address. (It is copied into
4318 the unusable tree at the outer level, so even if different address blocks
4319 contain the same address, it still won't get tried again.) */
4321 if (rc == DEFER || retry_host_key)
4323 int delete_flag = rc != DEFER ? rf_delete : 0;
4324 if (!retry_host_key)
4327 if (exp_bool(addrlist, US"transport", tblock->name, D_transport,
4328 US"retry_include_ip_address", ob->retry_include_ip_address,
4329 ob->expand_retry_include_ip_address, &incl_ip) != OK)
4330 incl_ip = TRUE; /* error; use most-specific retry record */
4332 retry_host_key = incl_ip
4333 ? string_sprintf("T:%S:%s%s", host->name, host->address, pistring)
4334 : string_sprintf("T:%S%s", host->name, pistring);
4337 /* If a delivery of another message over an existing SMTP connection
4338 yields DEFER, we do NOT set up retry data for the host. This covers the
4339 case when there are delays in routing the addresses in the second message
4340 that are so long that the server times out. This is alleviated by not
4341 routing addresses that previously had routing defers when handling an
4342 existing connection, but even so, this case may occur (e.g. if a
4343 previously happily routed address starts giving routing defers). If the
4344 host is genuinely down, another non-continued message delivery will
4345 notice it soon enough. */
4347 if (delete_flag != 0 || !continue_hostname)
4348 retry_add_item(first_addr, retry_host_key, rf_host | delete_flag);
4350 /* We may have tried an expired host, if its retry time has come; ensure
4351 the status reflects the expiry for the benefit of any other addresses. */
4355 host->status = host_is_expired
4356 ? hstatus_unusable_expired : hstatus_unusable;
4357 host->why = hwhy_deferred;
4361 /* If message_defer is set (host was OK, but every recipient got deferred
4362 because of some message-specific problem), or if that had happened
4363 previously so that a message retry key exists, add an appropriate item
4364 to the retry chain. Note that if there was a message defer but now there is
4365 a host defer, the message defer record gets deleted. That seems perfectly
4366 reasonable. Also, stop the message from being remembered as waiting
4367 for specific hosts. */
4369 if (message_defer || retry_message_key)
4371 int delete_flag = message_defer ? 0 : rf_delete;
4372 if (!retry_message_key)
4375 if (exp_bool(addrlist, US"transport", tblock->name, D_transport,
4376 US"retry_include_ip_address", ob->retry_include_ip_address,
4377 ob->expand_retry_include_ip_address, &incl_ip) != OK)
4378 incl_ip = TRUE; /* error; use most-specific retry record */
4380 retry_message_key = incl_ip
4381 ? string_sprintf("T:%S:%s%s:%s", host->name, host->address, pistring,
4383 : string_sprintf("T:%S%s:%s", host->name, pistring, message_id);
4385 retry_add_item(addrlist, retry_message_key,
4386 rf_message | rf_host | delete_flag);
4387 update_waiting = FALSE;
4390 /* Any return other than DEFER (that is, OK or ERROR) means that the
4391 addresses have got their final statuses filled in for this host. In the OK
4392 case, see if any of them are deferred. */
4395 for (addr = addrlist; addr; addr = addr->next)
4396 if (addr->transport_return == DEFER)
4398 some_deferred = TRUE;
4402 /* If no addresses deferred or the result was ERROR, return. We do this for
4403 ERROR because a failing filter set-up or add_headers expansion is likely to
4404 fail for any host we try. */
4406 if (rc == ERROR || (rc == OK && !some_deferred))
4408 DEBUG(D_transport) debug_printf("Leaving %s transport\n", tblock->name);
4409 return TRUE; /* Each address has its status */
4412 /* If the result was DEFER or some individual addresses deferred, let
4413 the loop run to try other hosts with the deferred addresses, except for the
4414 case when we were trying to deliver down an existing channel and failed.
4415 Don't try any other hosts in this case. */
4417 if (continue_hostname) break;
4419 /* If the whole delivery, or some individual addresses, were deferred and
4420 there are more hosts that could be tried, do not count this host towards
4421 the hosts_max_try limit if the age of the message is greater than the
4422 maximum retry time for this host. This means we may try try all hosts,
4423 ignoring the limit, when messages have been around for some time. This is
4424 important because if we don't try all hosts, the address will never time
4425 out. NOTE: this does not apply to hosts_max_try_hardlimit. */
4427 if ((rc == DEFER || some_deferred) && nexthost)
4430 retry_config *retry = retry_find_config(host->name, NULL, 0, 0);
4432 if (retry && retry->rules)
4434 retry_rule *last_rule;
4435 for (last_rule = retry->rules;
4437 last_rule = last_rule->next);
4438 timedout = time(NULL) - received_time > last_rule->timeout;
4440 else timedout = TRUE; /* No rule => timed out */
4444 unexpired_hosts_tried--;
4445 DEBUG(D_transport) debug_printf("temporary delivery error(s) override "
4446 "hosts_max_try (message older than host's retry time)\n");
4449 } /* End of loop for trying multiple hosts. */
4451 /* This is the end of the loop that repeats iff expired is TRUE and
4452 ob->delay_after_cutoff is FALSE. The second time round we will
4453 try those hosts that haven't been tried since the message arrived. */
4457 debug_printf("all IP addresses skipped or deferred at least one address\n");
4458 if (expired && !ob->delay_after_cutoff && cutoff_retry == 0)
4459 debug_printf("retrying IP addresses not tried since message arrived\n");
4464 /* Get here if all IP addresses are skipped or defer at least one address. In
4465 MUA wrapper mode, this will happen only for connection or other non-message-
4466 specific failures. Force the delivery status for all addresses to FAIL. */
4470 for (addr = addrlist; addr; addr = addr->next)
4471 addr->transport_return = FAIL;
4475 /* In the normal, non-wrapper case, add a standard message to each deferred
4476 address if there hasn't been an error, that is, if it hasn't actually been
4477 tried this time. The variable "expired" will be FALSE if any deliveries were
4478 actually tried, or if there was at least one host that was not expired. That
4479 is, it is TRUE only if no deliveries were tried and all hosts were expired. If
4480 a delivery has been tried, an error code will be set, and the failing of the
4481 message is handled by the retry code later.
4483 If queue_smtp is set, or this transport was called to send a subsequent message
4484 down an existing TCP/IP connection, and something caused the host not to be
4485 found, we end up here, but can detect these cases and handle them specially. */
4487 for (addr = addrlist; addr; addr = addr->next)
4489 /* If host is not NULL, it means that we stopped processing the host list
4490 because of hosts_max_try or hosts_max_try_hardlimit. In the former case, this
4491 means we need to behave as if some hosts were skipped because their retry
4492 time had not come. Specifically, this prevents the address from timing out.
4493 However, if we have hit hosts_max_try_hardlimit, we want to behave as if all
4494 hosts were tried. */
4497 if (total_hosts_tried >= ob->hosts_max_try_hardlimit)
4500 debug_printf("hosts_max_try_hardlimit reached: behave as if all "
4501 "hosts were tried\n");
4506 debug_printf("hosts_max_try limit caused some hosts to be skipped\n");
4507 setflag(addr, af_retry_skipped);
4510 if (queue_smtp) /* no deliveries attempted */
4512 addr->transport_return = DEFER;
4513 addr->basic_errno = 0;
4514 addr->message = US"SMTP delivery explicitly queued";
4517 else if ( addr->transport_return == DEFER
4518 && (addr->basic_errno == ERRNO_UNKNOWNERROR || addr->basic_errno == 0)
4522 addr->basic_errno = ERRNO_HRETRY;
4523 if (continue_hostname)
4524 addr->message = US"no host found for existing SMTP connection";
4527 setflag(addr, af_pass_message); /* This is not a security risk */
4528 addr->message = string_sprintf(
4529 "all hosts%s have been failing for a long time %s",
4530 addr->domain ? string_sprintf(" for '%s'", addr->domain) : US"",
4531 ob->delay_after_cutoff
4532 ? US"(and retry time not reached)"
4533 : US"and were last tried after this message arrived");
4535 /* If we are already using fallback hosts, or there are no fallback hosts
4536 defined, convert the result to FAIL to cause a bounce. */
4538 if (addr->host_list == addr->fallback_hosts || !addr->fallback_hosts)
4539 addr->transport_return = FAIL;
4544 if (hosts_retry == hosts_total)
4545 s = "retry time not reached for any host%s";
4546 else if (hosts_fail == hosts_total)
4547 s = "all host address lookups%s failed permanently";
4548 else if (hosts_defer == hosts_total)
4549 s = "all host address lookups%s failed temporarily";
4550 else if (hosts_serial == hosts_total)
4551 s = "connection limit reached for all hosts%s";
4552 else if (hosts_fail+hosts_defer == hosts_total)
4553 s = "all host address lookups%s failed";
4555 s = "some host address lookups failed and retry time "
4556 "not reached for other hosts or connection limit reached%s";
4558 addr->message = string_sprintf(s,
4559 addr->domain ? string_sprintf(" for '%s'", addr->domain) : US"");
4564 /* Update the database which keeps information about which messages are waiting
4565 for which hosts to become available. For some message-specific errors, the
4566 update_waiting flag is turned off because we don't want follow-on deliveries in
4567 those cases. If this transport instance is explicitly limited to one message
4568 per connection then follow-on deliveries are not possible and there's no need
4569 to create/update the per-transport wait-<transport_name> database. */
4571 if (update_waiting && tblock->connection_max_messages != 1)
4572 transport_update_waiting(hostlist, tblock->name);
4576 DEBUG(D_transport) debug_printf("Leaving %s transport\n", tblock->name);
4578 return TRUE; /* Each address has its status */
4583 /* End of transport/smtp.c */