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;
1192 /* TLSA lookup string */
1193 (void)sprintf(CS buffer, "_%d._tcp.%.256s", host->port, host->name);
1195 rc = dns_lookup(dnsa, buffer, T_TLSA, &fullname);
1196 sec = dns_is_secure(dnsa);
1198 debug_printf("TLSA lookup ret %d %sDNSSEC\n", rc, sec ? "" : "not ");
1205 log_write(0, LOG_MAIN, "DANE error: TLSA lookup not DNSSEC");
1208 return DEFER; /* just defer this TLS'd conn */
1210 case DNS_NODATA: /* no TLSA RR for this lookup */
1211 case DNS_NOMATCH: /* no records at all for this lookup */
1212 return dane_required ? FAIL : FAIL_FORCED;
1216 return dane_required ? FAIL : DEFER;
1223 typedef struct smtp_compare_s
1225 uschar *current_sender_address;
1226 struct transport_instance *tblock;
1230 /* Create a unique string that identifies this message, it is based on
1231 sender_address, helo_data and tls_certificate if enabled.
1235 smtp_local_identity(uschar * sender, struct transport_instance * tblock)
1237 address_item * addr1;
1238 uschar * if1 = US"";
1239 uschar * helo1 = US"";
1241 uschar * tlsc1 = US"";
1243 uschar * save_sender_address = sender_address;
1244 uschar * local_identity = NULL;
1245 smtp_transport_options_block * ob =
1246 (smtp_transport_options_block *)tblock->options_block;
1248 sender_address = sender;
1250 addr1 = deliver_make_addr (sender, TRUE);
1251 deliver_set_expansions(addr1);
1254 if1 = expand_string(ob->interface);
1257 helo1 = expand_string(ob->helo_data);
1260 if (ob->tls_certificate)
1261 tlsc1 = expand_string(ob->tls_certificate);
1262 local_identity = string_sprintf ("%s^%s^%s", if1, helo1, tlsc1);
1264 local_identity = string_sprintf ("%s^%s", if1, helo1);
1267 deliver_set_expansions(NULL);
1268 sender_address = save_sender_address;
1270 return local_identity;
1275 /* This routine is a callback that is called from transport_check_waiting.
1276 This function will evaluate the incoming message versus the previous
1277 message. If the incoming message is using a different local identity then
1278 we will veto this new message. */
1281 smtp_are_same_identities(uschar * message_id, smtp_compare_t * s_compare)
1283 uschar * message_local_identity,
1284 * current_local_identity,
1285 * new_sender_address;
1287 current_local_identity =
1288 smtp_local_identity(s_compare->current_sender_address, s_compare->tblock);
1290 if (!(new_sender_address = deliver_get_sender_address(message_id)))
1293 message_local_identity =
1294 smtp_local_identity(new_sender_address, s_compare->tblock);
1296 return Ustrcmp(current_local_identity, message_local_identity) == 0;
1302 ehlo_response(uschar * buf, uschar checks)
1304 size_t bsize = Ustrlen(buf);
1307 if ( checks & PEER_OFFERED_TLS
1308 && pcre_exec(regex_STARTTLS, NULL, CS buf, bsize, 0, PCRE_EOPT, NULL, 0) < 0)
1309 checks &= ~PEER_OFFERED_TLS;
1312 if ( checks & PEER_OFFERED_IGNQ
1313 && pcre_exec(regex_IGNOREQUOTA, NULL, CS buf, bsize, 0,
1314 PCRE_EOPT, NULL, 0) < 0)
1315 checks &= ~PEER_OFFERED_IGNQ;
1317 if ( checks & PEER_OFFERED_CHUNKING
1318 && pcre_exec(regex_CHUNKING, NULL, CS buf, bsize, 0, PCRE_EOPT, NULL, 0) < 0)
1319 checks &= ~PEER_OFFERED_CHUNKING;
1321 #ifndef DISABLE_PRDR
1322 if ( checks & PEER_OFFERED_PRDR
1323 && pcre_exec(regex_PRDR, NULL, CS buf, bsize, 0, PCRE_EOPT, NULL, 0) < 0)
1324 checks &= ~PEER_OFFERED_PRDR;
1328 if ( checks & PEER_OFFERED_UTF8
1329 && pcre_exec(regex_UTF8, NULL, CS buf, bsize, 0, PCRE_EOPT, NULL, 0) < 0)
1330 checks &= ~PEER_OFFERED_UTF8;
1333 if ( checks & PEER_OFFERED_DSN
1334 && pcre_exec(regex_DSN, NULL, CS buf, bsize, 0, PCRE_EOPT, NULL, 0) < 0)
1335 checks &= ~PEER_OFFERED_DSN;
1337 if ( checks & PEER_OFFERED_PIPE
1338 && pcre_exec(regex_PIPELINING, NULL, CS buf, bsize, 0,
1339 PCRE_EOPT, NULL, 0) < 0)
1340 checks &= ~PEER_OFFERED_PIPE;
1342 if ( checks & PEER_OFFERED_SIZE
1343 && pcre_exec(regex_SIZE, NULL, CS buf, bsize, 0, PCRE_EOPT, NULL, 0) < 0)
1344 checks &= ~PEER_OFFERED_SIZE;
1351 /* Callback for emitting a BDAT data chunk header.
1353 If given a nonzero size, first flush any buffered SMTP commands
1354 then emit the command.
1356 Reap previous SMTP command responses if requested, and always reap
1357 the response from a previous BDAT command.
1360 tctx transport context
1361 chunk_size value for SMTP BDAT command
1363 tc_chunk_last add LAST option to SMTP BDAT command
1364 tc_reap_prev reap response to previous SMTP commands
1366 Returns: OK or ERROR
1370 smtp_chunk_cmd_callback(transport_ctx * tctx, unsigned chunk_size,
1373 smtp_transport_options_block * ob =
1374 (smtp_transport_options_block *)(tctx->tblock->options_block);
1375 smtp_context * sx = tctx->smtp_context;
1379 /* Write SMTP chunk header command. If not reaping responses, note that
1380 there may be more writes (like, the chunk data) done soon. */
1384 if((cmd_count = smtp_write_command(&sx->outblock,
1385 flags & tc_reap_prev ? SCMD_FLUSH : SCMD_MORE,
1386 "BDAT %u%s\r\n", chunk_size, flags & tc_chunk_last ? " LAST" : "")
1387 ) < 0) return ERROR;
1388 if (flags & tc_chunk_last)
1389 data_command = string_copy(big_buffer); /* Save for later error message */
1392 prev_cmd_count = cmd_count += sx->cmd_count;
1394 /* Reap responses for any previous, but not one we just emitted */
1398 if (sx->pending_BDAT)
1401 if (flags & tc_reap_prev && prev_cmd_count > 0)
1403 DEBUG(D_transport) debug_printf("look for %d responses"
1404 " for previous pipelined cmds\n", prev_cmd_count);
1406 switch(sync_responses(sx, prev_cmd_count, 0))
1408 case 1: /* 2xx (only) => OK */
1409 case 3: sx->good_RCPT = TRUE; /* 2xx & 5xx => OK & progress made */
1410 case 2: sx->completed_addr = TRUE; /* 5xx (only) => progress made */
1411 case 0: break; /* No 2xx or 5xx, but no probs */
1413 case -1: /* Timeout on RCPT */
1414 default: return ERROR; /* I/O error, or any MAIL/DATA error */
1417 if (!sx->pending_BDAT)
1418 pipelining_active = FALSE;
1421 /* Reap response for an outstanding BDAT */
1423 if (sx->pending_BDAT)
1425 DEBUG(D_transport) debug_printf("look for one response for BDAT\n");
1427 if (!smtp_read_response(&sx->inblock, sx->buffer, sizeof(sx->buffer), '2',
1428 ob->command_timeout))
1430 if (errno == 0 && sx->buffer[0] == '4')
1432 errno = ERRNO_DATA4XX; /*XXX does this actually get used? */
1433 sx->addrlist->more_errno |=
1434 ((sx->buffer[1] - '0')*10 + sx->buffer[2] - '0') << 8;
1439 sx->pending_BDAT = FALSE;
1440 pipelining_active = FALSE;
1442 else if (chunk_size > 0)
1443 sx->pending_BDAT = TRUE;
1446 sx->cmd_count = cmd_count;
1452 /*************************************************
1453 * Make connection for given message *
1454 *************************************************/
1458 ctx connection context
1459 suppress_tls if TRUE, don't attempt a TLS connection - this is set for
1460 a second attempt after TLS initialization fails
1462 Returns: OK - the connection was made and the delivery attempted;
1463 fd is set in the conn context, tls_out set up.
1464 DEFER - the connection could not be made, or something failed
1465 while setting up the SMTP session, or there was a
1466 non-message-specific error, such as a timeout.
1467 ERROR - helo_data or add_headers or authenticated_sender is
1468 specified for this transport, and the string failed
1472 smtp_setup_conn(smtp_context * sx, BOOL suppress_tls)
1474 #if defined(SUPPORT_TLS) && defined(EXPERIMENTAL_DANE)
1475 dns_answer tlsa_dnsa;
1477 BOOL pass_message = FALSE;
1478 uschar * message = NULL;
1482 sx->ob = (smtp_transport_options_block *) sx->tblock->options_block;
1484 sx->lmtp = strcmpic(sx->ob->protocol, US"lmtp") == 0;
1485 sx->smtps = strcmpic(sx->ob->protocol, US"smtps") == 0;
1487 sx->send_rset = TRUE;
1488 sx->send_quit = TRUE;
1489 sx->setting_up = TRUE;
1491 sx->esmtp_sent = FALSE;
1493 sx->utf8_needed = FALSE;
1495 sx->dsn_all_lasthop = TRUE;
1496 #if defined(SUPPORT_TLS) && defined(EXPERIMENTAL_DANE)
1498 sx->dane_required = verify_check_given_host(&sx->ob->hosts_require_dane, sx->host) == OK;
1501 if ((sx->max_rcpt = sx->tblock->max_addresses) == 0) sx->max_rcpt = 999999;
1502 sx->peer_offered = 0;
1503 sx->igquotstr = US"";
1504 if (!sx->helo_data) sx->helo_data = sx->ob->helo_data;
1505 #ifdef EXPERIMENTAL_DSN_INFO
1506 sx->smtp_greeting = NULL;
1507 sx->helo_response = NULL;
1510 smtp_command = US"initial connection";
1511 sx->buffer[0] = '\0';
1513 /* Set up the buffer for reading SMTP response packets. */
1515 sx->inblock.buffer = sx->inbuffer;
1516 sx->inblock.buffersize = sizeof(sx->inbuffer);
1517 sx->inblock.ptr = sx->inbuffer;
1518 sx->inblock.ptrend = sx->inbuffer;
1520 /* Set up the buffer for holding SMTP commands while pipelining */
1522 sx->outblock.buffer = sx->outbuffer;
1523 sx->outblock.buffersize = sizeof(sx->outbuffer);
1524 sx->outblock.ptr = sx->outbuffer;
1525 sx->outblock.cmd_count = 0;
1526 sx->outblock.authenticating = FALSE;
1528 /* Reset the parameters of a TLS session. */
1531 tls_out.cipher = NULL; /* the one we may use for this transport */
1532 tls_out.ourcert = NULL;
1533 tls_out.peercert = NULL;
1534 tls_out.peerdn = NULL;
1535 #if defined(SUPPORT_TLS) && !defined(USE_GNUTLS)
1538 tls_out.ocsp = OCSP_NOT_REQ;
1540 /* Flip the legacy TLS-related variables over to the outbound set in case
1541 they're used in the context of the transport. Don't bother resetting
1542 afterward (when being used by a transport) as we're in a subprocess.
1543 For verify, unflipped once the callout is dealt with */
1545 tls_modify_variables(&tls_out);
1550 set_errno_nohost(sx->addrlist, ERRNO_TLSFAILURE, US"TLS support not available",
1556 /* Make a connection to the host if this isn't a continued delivery, and handle
1557 the initial interaction and HELO/EHLO/LHLO. Connect timeout errors are handled
1558 specially so they can be identified for retries. */
1560 if (!continue_hostname)
1563 HDEBUG(D_verify) debug_printf("interface=%s port=%d\n", sx->interface, sx->port);
1565 /* Get the actual port the connection will use, into sx->host */
1567 smtp_port_for_connect(sx->host, sx->port);
1569 #if defined(SUPPORT_TLS) && defined(EXPERIMENTAL_DANE)
1570 /* Do TLSA lookup for DANE */
1572 tls_out.dane_verified = FALSE;
1573 tls_out.tlsa_usage = 0;
1575 if (sx->host->dnssec == DS_YES)
1577 if( sx->dane_required
1578 || verify_check_given_host(&sx->ob->hosts_try_dane, sx->host) == OK
1580 switch (rc = tlsa_lookup(sx->host, &tlsa_dnsa, sx->dane_required))
1582 case OK: sx->dane = TRUE;
1583 sx->ob->tls_tempfail_tryclear = FALSE;
1585 case FAIL_FORCED: break;
1586 default: set_errno_nohost(sx->addrlist, ERRNO_DNSDEFER,
1587 string_sprintf("DANE error: tlsa lookup %s",
1588 rc == DEFER ? "DEFER" : "FAIL"),
1593 else if (sx->dane_required)
1595 set_errno_nohost(sx->addrlist, ERRNO_DNSDEFER,
1596 string_sprintf("DANE error: %s lookup not DNSSEC", sx->host->name),
1603 /* Make the TCP connection */
1605 sx->inblock.sock = sx->outblock.sock =
1606 smtp_connect(sx->host, sx->host_af, sx->interface,
1607 sx->ob->connect_timeout, sx->tblock);
1609 if (sx->inblock.sock < 0)
1611 uschar * msg = NULL;
1614 msg = US strerror(errno);
1615 HDEBUG(D_verify) debug_printf("connect: %s\n", msg);
1617 set_errno_nohost(sx->addrlist,
1618 errno == ETIMEDOUT ? ERRNO_CONNECTTIMEOUT : errno,
1619 sx->verify ? string_sprintf("could not connect: %s", msg)
1622 sx->send_quit = FALSE;
1626 /* Expand the greeting message while waiting for the initial response. (Makes
1627 sense if helo_data contains ${lookup dnsdb ...} stuff). The expansion is
1628 delayed till here so that $sending_interface and $sending_port are set. */
1631 if (!(sx->helo_data = expand_string(sx->helo_data)))
1633 log_write(0, LOG_MAIN|LOG_PANIC,
1634 "<%s>: failed to expand transport's helo_data value for callout: %s",
1635 sx->addrlist->address, expand_string_message);
1640 expand_string_message = NULL;
1641 if ((sx->helo_data = string_domain_utf8_to_alabel(sx->helo_data,
1642 &expand_string_message)),
1643 expand_string_message)
1645 log_write(0, LOG_MAIN|LOG_PANIC,
1646 "<%s>: failed to expand transport's helo_data value for callout: %s",
1647 sx->addrlist->address, expand_string_message);
1649 sx->helo_data = NULL;
1653 /* The first thing is to wait for an initial OK response. The dreaded "goto"
1654 is nevertheless a reasonably clean way of programming this kind of logic,
1655 where you want to escape on any error. */
1662 (void) setsockopt(sx->inblock.sock, IPPROTO_TCP, TCP_QUICKACK, US &off, sizeof(off));
1664 good_response = smtp_read_response(&sx->inblock, sx->buffer, sizeof(sx->buffer),
1665 '2', sx->ob->command_timeout);
1666 #ifdef EXPERIMENTAL_DSN_INFO
1667 sx->smtp_greeting = string_copy(sx->buffer);
1669 if (!good_response) goto RESPONSE_FAILED;
1671 #ifndef DISABLE_EVENT
1674 lookup_dnssec_authenticated = sx->host->dnssec==DS_YES ? US"yes"
1675 : sx->host->dnssec==DS_NO ? US"no" : NULL;
1676 s = event_raise(sx->tblock->event_action, US"smtp:connect", sx->buffer);
1679 set_errno_nohost(sx->addrlist, ERRNO_EXPANDFAIL,
1680 string_sprintf("deferred by smtp:connect event expansion: %s", s),
1688 /* Now check if the helo_data expansion went well, and sign off cleanly if
1693 message = string_sprintf("failed to expand helo_data: %s",
1694 expand_string_message);
1695 set_errno_nohost(sx->addrlist, ERRNO_EXPANDFAIL, message, DEFER, FALSE);
1701 /** Debugging without sending a message
1702 sx->addrlist->transport_return = DEFER;
1706 /* Errors that occur after this point follow an SMTP command, which is
1707 left in big_buffer by smtp_write_command() for use in error messages. */
1709 smtp_command = big_buffer;
1711 /* Tell the remote who we are...
1713 February 1998: A convention has evolved that ESMTP-speaking MTAs include the
1714 string "ESMTP" in their greeting lines, so make Exim send EHLO if the
1715 greeting is of this form. The assumption was that the far end supports it
1716 properly... but experience shows that there are some that give 5xx responses,
1717 even though the banner includes "ESMTP" (there's a bloody-minded one that
1718 says "ESMTP not spoken here"). Cope with that case.
1720 September 2000: Time has passed, and it seems reasonable now to always send
1721 EHLO at the start. It is also convenient to make the change while installing
1724 July 2003: Joachim Wieland met a broken server that advertises "PIPELINING"
1725 but times out after sending MAIL FROM, RCPT TO and DATA all together. There
1726 would be no way to send out the mails, so there is now a host list
1727 "hosts_avoid_esmtp" that disables ESMTP for special hosts and solves the
1728 PIPELINING problem as well. Maybe it can also be useful to cure other
1729 problems with broken servers.
1731 Exim originally sent "Helo" at this point and ran for nearly a year that way.
1732 Then somebody tried it with a Microsoft mailer... It seems that all other
1733 mailers use upper case for some reason (the RFC is quite clear about case
1734 independence) so, for peace of mind, I gave in. */
1736 sx->esmtp = verify_check_given_host(&sx->ob->hosts_avoid_esmtp, sx->host) != OK;
1738 /* Alas; be careful, since this goto is not an error-out, so conceivably
1739 we might set data between here and the target which we assume to exist
1740 and be usable. I can see this coming back to bite us. */
1744 smtp_peer_options |= PEER_OFFERED_TLS;
1745 suppress_tls = FALSE;
1746 sx->ob->tls_tempfail_tryclear = FALSE;
1747 smtp_command = US"SSL-on-connect";
1754 if (smtp_write_command(&sx->outblock, SCMD_FLUSH, "%s %s\r\n",
1755 sx->lmtp ? "LHLO" : "EHLO", sx->helo_data) < 0)
1757 sx->esmtp_sent = TRUE;
1758 if (!smtp_read_response(&sx->inblock, sx->buffer, sizeof(sx->buffer), '2',
1759 sx->ob->command_timeout))
1761 if (errno != 0 || sx->buffer[0] == 0 || sx->lmtp)
1763 #ifdef EXPERIMENTAL_DSN_INFO
1764 sx->helo_response = string_copy(sx->buffer);
1766 goto RESPONSE_FAILED;
1770 #ifdef EXPERIMENTAL_DSN_INFO
1771 sx->helo_response = string_copy(sx->buffer);
1776 debug_printf("not sending EHLO (host matches hosts_avoid_esmtp)\n");
1781 int n = sizeof(sx->buffer);
1782 uschar * rsp = sx->buffer;
1784 if (sx->esmtp_sent && (n = Ustrlen(sx->buffer)) < sizeof(sx->buffer)/2)
1785 { rsp = sx->buffer + n + 1; n = sizeof(sx->buffer) - n; }
1787 if (smtp_write_command(&sx->outblock, SCMD_FLUSH, "HELO %s\r\n", sx->helo_data) < 0)
1789 good_response = smtp_read_response(&sx->inblock, rsp, n,
1790 '2', sx->ob->command_timeout);
1791 #ifdef EXPERIMENTAL_DSN_INFO
1792 sx->helo_response = string_copy(rsp);
1796 /* Handle special logging for a closed connection after HELO
1797 when had previously sent EHLO */
1799 if (rsp != sx->buffer && rsp[0] == 0 && (errno == 0 || errno == ECONNRESET))
1801 errno = ERRNO_SMTPCLOSED;
1802 goto EHLOHELO_FAILED;
1804 Ustrncpy(sx->buffer, rsp, sizeof(sx->buffer)/2);
1805 goto RESPONSE_FAILED;
1809 sx->peer_offered = smtp_peer_options = 0;
1811 if (sx->esmtp || sx->lmtp)
1813 sx->peer_offered = ehlo_response(sx->buffer,
1814 PEER_OFFERED_TLS /* others checked later */
1817 /* Set tls_offered if the response to EHLO specifies support for STARTTLS. */
1820 smtp_peer_options |= sx->peer_offered & PEER_OFFERED_TLS;
1825 /* For continuing deliveries down the same channel, having re-exec'd the socket
1826 is the standard input; for a socket held open from verify it is recorded
1827 in the cutthrough context block. Either way we don't need to redo EHLO here
1828 (but may need to do so for TLS - see below).
1829 Set up the pointer to where subsequent commands will be left, for
1830 error messages. Note that smtp_peer_options will have been
1831 set from the command line if they were set in the process that passed the
1834 /*XXX continue case needs to propagate DSN_INFO, prob. in deliver.c
1835 as the continue goes via transport_pass_socket() and doublefork and exec.
1836 It does not wait. Unclear how we keep separate host's responses
1837 separate - we could match up by host ip+port as a bodge. */
1841 if (cutthrough.fd >= 0 && cutthrough.callout_hold_only)
1843 sx->inblock.sock = sx->outblock.sock = cutthrough.fd;
1844 sx->host->port = sx->port = cutthrough.host.port;
1848 sx->inblock.sock = sx->outblock.sock = 0; /* stdin */
1849 smtp_port_for_connect(sx->host, sx->port); /* Record the port that was used */
1851 smtp_command = big_buffer;
1852 sx->helo_data = NULL; /* ensure we re-expand ob->helo_data */
1854 /* For a continued connection with TLS being proxied for us, or a
1855 held-open verify connection with TLS, nothing more to do. */
1857 if ( continue_proxy_cipher
1858 || (cutthrough.fd >= 0 && cutthrough.callout_hold_only && cutthrough.is_tls)
1861 sx->peer_offered = smtp_peer_options;
1862 pipelining_active = !!(smtp_peer_options & PEER_OFFERED_PIPE);
1863 HDEBUG(D_transport) debug_printf("continued connection, %s TLS\n",
1864 continue_proxy_cipher ? "proxied" : "verify conn with");
1867 HDEBUG(D_transport) debug_printf("continued connection, no TLS\n");
1870 /* If TLS is available on this connection, whether continued or not, attempt to
1871 start up a TLS session, unless the host is in hosts_avoid_tls. If successful,
1872 send another EHLO - the server may give a different answer in secure mode. We
1873 use a separate buffer for reading the response to STARTTLS so that if it is
1874 negative, the original EHLO data is available for subsequent analysis, should
1875 the client not be required to use TLS. If the response is bad, copy the buffer
1876 for error analysis. */
1879 if ( smtp_peer_options & PEER_OFFERED_TLS
1881 && verify_check_given_host(&sx->ob->hosts_avoid_tls, sx->host) != OK
1883 || verify_check_given_host(&sx->ob->hosts_verify_avoid_tls, sx->host) != OK
1886 uschar buffer2[4096];
1887 if (smtp_write_command(&sx->outblock, SCMD_FLUSH, "STARTTLS\r\n") < 0)
1890 /* If there is an I/O error, transmission of this message is deferred. If
1891 there is a temporary rejection of STARRTLS and tls_tempfail_tryclear is
1892 false, we also defer. However, if there is a temporary rejection of STARTTLS
1893 and tls_tempfail_tryclear is true, or if there is an outright rejection of
1894 STARTTLS, we carry on. This means we will try to send the message in clear,
1895 unless the host is in hosts_require_tls (tested below). */
1897 if (!smtp_read_response(&sx->inblock, buffer2, sizeof(buffer2), '2',
1898 sx->ob->command_timeout))
1902 || (buffer2[0] == '4' && !sx->ob->tls_tempfail_tryclear)
1905 Ustrncpy(sx->buffer, buffer2, sizeof(sx->buffer));
1906 sx->buffer[sizeof(sx->buffer)-1] = '\0';
1907 goto RESPONSE_FAILED;
1911 /* STARTTLS accepted: try to negotiate a TLS session. */
1916 address_item * addr;
1918 int rc = tls_client_start(sx->inblock.sock, sx->host, sx->addrlist, sx->tblock,
1919 # ifdef EXPERIMENTAL_DANE
1920 sx->dane ? &tlsa_dnsa : NULL,
1924 /* TLS negotiation failed; give an error. From outside, this function may
1925 be called again to try in clear on a new connection, if the options permit
1926 it for this host. */
1930 # ifdef EXPERIMENTAL_DANE
1931 if (sx->dane) log_write(0, LOG_MAIN,
1932 "DANE attempt failed; TLS connection to %s [%s]: %s",
1933 sx->host->name, sx->host->address, errstr);
1936 errno = ERRNO_TLSFAILURE;
1937 message = string_sprintf("TLS session: %s", errstr);
1938 sx->send_quit = FALSE;
1942 /* TLS session is set up */
1944 smtp_peer_options_wrap = smtp_peer_options;
1945 for (addr = sx->addrlist; addr; addr = addr->next)
1946 if (addr->transport_return == PENDING_DEFER)
1948 addr->cipher = tls_out.cipher;
1949 addr->ourcert = tls_out.ourcert;
1950 addr->peercert = tls_out.peercert;
1951 addr->peerdn = tls_out.peerdn;
1952 addr->ocsp = tls_out.ocsp;
1957 /* if smtps, we'll have smtp_command set to something else; always safe to
1959 smtp_command = big_buffer;
1961 /* If we started TLS, redo the EHLO/LHLO exchange over the secure channel. If
1962 helo_data is null, we are dealing with a connection that was passed from
1963 another process, and so we won't have expanded helo_data above. We have to
1964 expand it here. $sending_ip_address and $sending_port are set up right at the
1965 start of the Exim process (in exim.c). */
1967 if (tls_out.active >= 0)
1972 if (!sx->helo_data && !(sx->helo_data = expand_string(sx->ob->helo_data)))
1974 uschar *message = string_sprintf("failed to expand helo_data: %s",
1975 expand_string_message);
1976 set_errno_nohost(sx->addrlist, ERRNO_EXPANDFAIL, message, DEFER, FALSE);
1981 /* For SMTPS we need to wait for the initial OK response. */
1984 good_response = smtp_read_response(&sx->inblock, sx->buffer, sizeof(sx->buffer),
1985 '2', sx->ob->command_timeout);
1986 #ifdef EXPERIMENTAL_DSN_INFO
1987 sx->smtp_greeting = string_copy(sx->buffer);
1989 if (!good_response) goto RESPONSE_FAILED;
1993 greeting_cmd = "EHLO";
1996 greeting_cmd = "HELO";
1998 debug_printf("not sending EHLO (host matches hosts_avoid_esmtp)\n");
2001 if (smtp_write_command(&sx->outblock, SCMD_FLUSH, "%s %s\r\n",
2002 sx->lmtp ? "LHLO" : greeting_cmd, sx->helo_data) < 0)
2004 good_response = smtp_read_response(&sx->inblock, sx->buffer, sizeof(sx->buffer),
2005 '2', sx->ob->command_timeout);
2006 #ifdef EXPERIMENTAL_DSN_INFO
2007 sx->helo_response = string_copy(sx->buffer);
2009 if (!good_response) goto RESPONSE_FAILED;
2010 smtp_peer_options = 0;
2013 /* If the host is required to use a secure channel, ensure that we
2017 # ifdef EXPERIMENTAL_DANE
2020 || verify_check_given_host(&sx->ob->hosts_require_tls, sx->host) == OK
2023 errno = ERRNO_TLSREQUIRED;
2024 message = string_sprintf("a TLS session is required, but %s",
2025 smtp_peer_options & PEER_OFFERED_TLS
2026 ? "an attempt to start TLS failed" : "the server did not offer TLS support");
2029 #endif /*SUPPORT_TLS*/
2031 /* If TLS is active, we have just started it up and re-done the EHLO command,
2032 so its response needs to be analyzed. If TLS is not active and this is a
2033 continued session down a previously-used socket, we haven't just done EHLO, so
2036 if (continue_hostname == NULL
2038 || tls_out.active >= 0
2042 if (sx->esmtp || sx->lmtp)
2044 sx->peer_offered = ehlo_response(sx->buffer,
2046 | (sx->lmtp && sx->ob->lmtp_ignore_quota ? PEER_OFFERED_IGNQ : 0)
2047 | PEER_OFFERED_CHUNKING
2050 | (sx->addrlist->prop.utf8_msg ? PEER_OFFERED_UTF8 : 0)
2051 /*XXX if we hand peercaps on to continued-conn processes,
2052 must not depend on this addr */
2056 | (sx->ob->size_addition >= 0 ? PEER_OFFERED_SIZE : 0)
2059 /* Set for IGNOREQUOTA if the response to LHLO specifies support and the
2060 lmtp_ignore_quota option was set. */
2062 sx->igquotstr = sx->peer_offered & PEER_OFFERED_IGNQ ? US" IGNOREQUOTA" : US"";
2064 /* If the response to EHLO specified support for the SIZE parameter, note
2065 this, provided size_addition is non-negative. */
2067 smtp_peer_options |= sx->peer_offered & PEER_OFFERED_SIZE;
2069 /* Note whether the server supports PIPELINING. If hosts_avoid_esmtp matched
2070 the current host, esmtp will be false, so PIPELINING can never be used. If
2071 the current host matches hosts_avoid_pipelining, don't do it. */
2073 if ( sx->peer_offered & PEER_OFFERED_PIPE
2074 && verify_check_given_host(&sx->ob->hosts_avoid_pipelining, sx->host) != OK)
2075 smtp_peer_options |= PEER_OFFERED_PIPE;
2077 DEBUG(D_transport) debug_printf("%susing PIPELINING\n",
2078 smtp_peer_options & PEER_OFFERED_PIPE ? "" : "not ");
2080 if ( sx->peer_offered & PEER_OFFERED_CHUNKING
2081 && verify_check_given_host(&sx->ob->hosts_try_chunking, sx->host) != OK)
2082 sx->peer_offered &= ~PEER_OFFERED_CHUNKING;
2084 if (sx->peer_offered & PEER_OFFERED_CHUNKING)
2085 {DEBUG(D_transport) debug_printf("CHUNKING usable\n");}
2087 #ifndef DISABLE_PRDR
2088 if ( sx->peer_offered & PEER_OFFERED_PRDR
2089 && verify_check_given_host(&sx->ob->hosts_try_prdr, sx->host) != OK)
2090 sx->peer_offered &= ~PEER_OFFERED_PRDR;
2092 if (sx->peer_offered & PEER_OFFERED_PRDR)
2093 {DEBUG(D_transport) debug_printf("PRDR usable\n");}
2096 /* Note if the server supports DSN */
2097 smtp_peer_options |= sx->peer_offered & PEER_OFFERED_DSN;
2098 DEBUG(D_transport) debug_printf("%susing DSN\n",
2099 sx->peer_offered & PEER_OFFERED_DSN ? "" : "not ");
2101 /* Note if the response to EHLO specifies support for the AUTH extension.
2102 If it has, check that this host is one we want to authenticate to, and do
2103 the business. The host name and address must be available when the
2104 authenticator's client driver is running. */
2106 switch (yield = smtp_auth(sx->buffer, sizeof(sx->buffer), sx->addrlist, sx->host,
2107 sx->ob, sx->esmtp, &sx->inblock, &sx->outblock))
2109 default: goto SEND_QUIT;
2111 case FAIL_SEND: goto SEND_FAILED;
2112 case FAIL: goto RESPONSE_FAILED;
2116 pipelining_active = !!(smtp_peer_options & PEER_OFFERED_PIPE);
2118 /* The setting up of the SMTP call is now complete. Any subsequent errors are
2119 message-specific. */
2121 sx->setting_up = FALSE;
2124 if (sx->addrlist->prop.utf8_msg)
2126 sx->utf8_needed = !sx->addrlist->prop.utf8_downcvt
2127 && !sx->addrlist->prop.utf8_downcvt_maybe;
2128 DEBUG(D_transport) if (!sx->utf8_needed)
2129 debug_printf("utf8: %s downconvert\n",
2130 sx->addrlist->prop.utf8_downcvt ? "mandatory" : "optional");
2133 /* If this is an international message we need the host to speak SMTPUTF8 */
2134 if (sx->utf8_needed && !(sx->peer_offered & PEER_OFFERED_UTF8))
2136 errno = ERRNO_UTF8_FWD;
2137 goto RESPONSE_FAILED;
2149 sx->send_quit = check_response(sx->host, &errno, sx->addrlist->more_errno,
2150 sx->buffer, &code, &message, &pass_message);
2155 message = US string_sprintf("send() to %s [%s] failed: %s",
2156 sx->host->name, sx->host->address, strerror(errno));
2157 sx->send_quit = FALSE;
2160 /* This label is jumped to directly when a TLS negotiation has failed,
2161 or was not done for a host for which it is required. Values will be set
2162 in message and errno, and setting_up will always be true. Treat as
2163 a temporary error. */
2167 message = string_sprintf("Remote host closed connection in response to %s"
2168 " (EHLO response was: %s)", smtp_command, sx->buffer);
2169 sx->send_quit = FALSE;
2178 /* The failure happened while setting up the call; see if the failure was
2179 a 5xx response (this will either be on connection, or following HELO - a 5xx
2180 after EHLO causes it to try HELO). If so, and there are no more hosts to try,
2181 fail all addresses, as this host is never going to accept them. For other
2182 errors during setting up (timeouts or whatever), defer all addresses, and
2183 yield DEFER, so that the host is not tried again for a while.
2185 XXX This peeking for another host feels like a layering violation. We want
2186 to note the host as unusable, but down here we shouldn't know if this was
2187 the last host to try for the addr(list). Perhaps the upper layer should be
2188 the one to do set_errno() ? The problem is that currently the addr is where
2189 errno etc. are stashed, but until we run out of hosts to try the errors are
2190 host-specific. Maybe we should enhance the host_item definition? */
2193 sx->ok = FALSE; /* For when reached by GOTO */
2194 set_errno(sx->addrlist, errno, message,
2199 || errno == ERRNO_UTF8_FWD
2202 pass_message, sx->host
2203 #ifdef EXPERIMENTAL_DSN_INFO
2204 , sx->smtp_greeting, sx->helo_response
2214 (void)smtp_write_command(&sx->outblock, SCMD_FLUSH, "QUIT\r\n");
2217 tls_close(FALSE, TRUE);
2220 /* Close the socket, and return the appropriate value, first setting
2221 works because the NULL setting is passed back to the calling process, and
2222 remote_max_parallel is forced to 1 when delivering over an existing connection,
2225 HDEBUG(D_transport|D_acl|D_v) debug_printf_indent(" SMTP(close)>>\n");
2228 shutdown(sx->outblock.sock, SHUT_WR);
2229 if (fcntl(sx->inblock.sock, F_SETFL, O_NONBLOCK) == 0)
2230 for (rc = 16; read(sx->inblock.sock, sx->inbuffer, sizeof(sx->inbuffer)) > 0 && rc > 0;)
2231 rc--; /* drain socket */
2232 sx->send_quit = FALSE;
2234 (void)close(sx->inblock.sock);
2235 sx->inblock.sock = sx->outblock.sock = -1;
2237 #ifndef DISABLE_EVENT
2238 (void) event_raise(sx->tblock->event_action, US"tcp:close", NULL);
2241 continue_transport = NULL;
2242 continue_hostname = NULL;
2249 /* Create the string of options that will be appended to the MAIL FROM:
2250 in the connection context buffer */
2253 build_mailcmd_options(smtp_context * sx, address_item * addrlist)
2255 uschar * p = sx->buffer;
2256 address_item * addr;
2261 /* If we know the receiving MTA supports the SIZE qualification,
2262 send it, adding something to the message size to allow for imprecision
2263 and things that get added en route. Exim keeps the number of lines
2264 in a message, so we can give an accurate value for the original message, but we
2265 need some additional to handle added headers. (Double "." characters don't get
2266 included in the count.) */
2268 if (sx->peer_offered & PEER_OFFERED_SIZE)
2270 /*XXX problem here under spool_files_wireformat?
2271 Or just forget about lines? Or inflate by a fixed proportion? */
2273 sprintf(CS p, " SIZE=%d", message_size+message_linecount+sx->ob->size_addition);
2277 #ifndef DISABLE_PRDR
2278 /* If it supports Per-Recipient Data Reponses, and we have omre than one recipient,
2281 sx->prdr_active = FALSE;
2282 if (sx->peer_offered & PEER_OFFERED_PRDR)
2283 for (addr = addrlist; addr; addr = addr->next)
2284 if (addr->transport_return == PENDING_DEFER)
2286 for (addr = addr->next; addr; addr = addr->next)
2287 if (addr->transport_return == PENDING_DEFER)
2288 { /* at least two recipients to send */
2289 sx->prdr_active = TRUE;
2290 sprintf(CS p, " PRDR"); p += 5;
2298 /* If it supports internationalised messages, and this meesage need that,
2301 if ( sx->peer_offered & PEER_OFFERED_UTF8
2302 && addrlist->prop.utf8_msg
2303 && !addrlist->prop.utf8_downcvt
2305 Ustrcpy(p, " SMTPUTF8"), p += 9;
2308 /* check if all addresses have DSN-lasthop flag; do not send RET and ENVID if so */
2309 for (sx->dsn_all_lasthop = TRUE, addr = addrlist, address_count = 0;
2310 addr && address_count < sx->max_rcpt;
2311 addr = addr->next) if (addr->transport_return == PENDING_DEFER)
2314 if (!(addr->dsn_flags & rf_dsnlasthop))
2316 sx->dsn_all_lasthop = FALSE;
2321 /* Add any DSN flags to the mail command */
2323 if (sx->peer_offered & PEER_OFFERED_DSN && !sx->dsn_all_lasthop)
2325 if (dsn_ret == dsn_ret_hdrs)
2326 { Ustrcpy(p, " RET=HDRS"); p += 9; }
2327 else if (dsn_ret == dsn_ret_full)
2328 { Ustrcpy(p, " RET=FULL"); p += 9; }
2332 string_format(p, sizeof(sx->buffer) - (p-sx->buffer), " ENVID=%s", dsn_envid);
2337 /* If an authenticated_sender override has been specified for this transport
2338 instance, expand it. If the expansion is forced to fail, and there was already
2339 an authenticated_sender for this message, the original value will be used.
2340 Other expansion failures are serious. An empty result is ignored, but there is
2341 otherwise no check - this feature is expected to be used with LMTP and other
2342 cases where non-standard addresses (e.g. without domains) might be required. */
2344 if (smtp_mail_auth_str(p, sizeof(sx->buffer) - (p-sx->buffer), addrlist, sx->ob))
2352 build_rcptcmd_options(smtp_context * sx, const address_item * addr)
2354 uschar * p = sx->buffer;
2357 /* Add any DSN flags to the rcpt command */
2359 if (sx->peer_offered & PEER_OFFERED_DSN && !(addr->dsn_flags & rf_dsnlasthop))
2361 if (addr->dsn_flags & rf_dsnflags)
2366 Ustrcpy(p, " NOTIFY=");
2368 for (i = 0; i < nelem(rf_list); i++) if (addr->dsn_flags & rf_list[i])
2370 if (!first) *p++ = ',';
2372 Ustrcpy(p, rf_names[i]);
2377 if (addr->dsn_orcpt)
2379 string_format(p, sizeof(sx->buffer) - (p-sx->buffer), " ORCPT=%s",
2390 0 good, rcpt results in addr->transport_return (PENDING_OK, DEFER, FAIL)
2391 -1 MAIL response error
2392 -2 any non-MAIL read i/o error
2393 -3 non-MAIL response timeout
2394 -4 internal error; channel still usable
2399 smtp_write_mail_and_rcpt_cmds(smtp_context * sx, int * yield)
2401 address_item * addr;
2405 if (build_mailcmd_options(sx, sx->first_addr) != OK)
2411 /* From here until we send the DATA command, we can make use of PIPELINING
2412 if the server host supports it. The code has to be able to check the responses
2413 at any point, for when the buffer fills up, so we write it totally generally.
2414 When PIPELINING is off, each command written reports that it has flushed the
2417 sx->pending_MAIL = TRUE; /* The block starts with MAIL */
2420 uschar * s = sx->from_addr;
2422 uschar * errstr = NULL;
2424 /* If we must downconvert, do the from-address here. Remember we had to
2425 for the to-addresses (done below), and also (ugly) for re-doing when building
2426 the delivery log line. */
2428 if ( sx->addrlist->prop.utf8_msg
2429 && (sx->addrlist->prop.utf8_downcvt || !(sx->peer_offered & PEER_OFFERED_UTF8))
2432 if (s = string_address_utf8_to_alabel(s, &errstr), errstr)
2434 set_errno_nohost(sx->addrlist, ERRNO_EXPANDFAIL, errstr, DEFER, FALSE);
2438 setflag(sx->addrlist, af_utf8_downcvt);
2442 rc = smtp_write_command(&sx->outblock, pipelining_active ? SCMD_BUFFER : SCMD_FLUSH,
2443 "MAIL FROM:<%s>%s\r\n", s, sx->buffer);
2446 mail_command = string_copy(big_buffer); /* Save for later error message */
2450 case -1: /* Transmission error */
2453 case +1: /* Cmd was sent */
2454 if (!smtp_read_response(&sx->inblock, sx->buffer, sizeof(sx->buffer), '2',
2455 sx->ob->command_timeout))
2457 if (errno == 0 && sx->buffer[0] == '4')
2459 errno = ERRNO_MAIL4XX;
2460 sx->addrlist->more_errno |= ((sx->buffer[1] - '0')*10 + sx->buffer[2] - '0') << 8;
2464 sx->pending_MAIL = FALSE;
2467 /* otherwise zero: command queued for pipeline */
2470 /* Pass over all the relevant recipient addresses for this host, which are the
2471 ones that have status PENDING_DEFER. If we are using PIPELINING, we can send
2472 several before we have to read the responses for those seen so far. This
2473 checking is done by a subroutine because it also needs to be done at the end.
2474 Send only up to max_rcpt addresses at a time, leaving next_addr pointing to
2475 the next one if not all are sent.
2477 In the MUA wrapper situation, we want to flush the PIPELINING buffer for the
2478 last address because we want to abort if any recipients have any kind of
2479 problem, temporary or permanent. We know that all recipient addresses will have
2480 the PENDING_DEFER status, because only one attempt is ever made, and we know
2481 that max_rcpt will be large, so all addresses will be done at once.
2483 For verify we flush the pipeline after any (the only) rcpt address. */
2485 for (addr = sx->first_addr, address_count = 0;
2486 addr && address_count < sx->max_rcpt;
2487 addr = addr->next) if (addr->transport_return == PENDING_DEFER)
2493 addr->dsn_aware = sx->peer_offered & PEER_OFFERED_DSN
2494 ? dsn_support_yes : dsn_support_no;
2497 no_flush = pipelining_active && !sx->verify
2498 && (!mua_wrapper || addr->next && address_count < sx->max_rcpt);
2500 build_rcptcmd_options(sx, addr);
2502 /* Now send the RCPT command, and process outstanding responses when
2503 necessary. After a timeout on RCPT, we just end the function, leaving the
2504 yield as OK, because this error can often mean that there is a problem with
2505 just one address, so we don't want to delay the host. */
2507 rcpt_addr = transport_rcpt_address(addr, sx->tblock->rcpt_include_affixes);
2510 if ( testflag(sx->addrlist, af_utf8_downcvt)
2511 && !(rcpt_addr = string_address_utf8_to_alabel(rcpt_addr, NULL))
2514 /*XXX could we use a per-address errstr here? Not fail the whole send? */
2515 errno = ERRNO_EXPANDFAIL;
2516 return -5; /*XXX too harsh? */
2520 count = smtp_write_command(&sx->outblock, no_flush ? SCMD_BUFFER : SCMD_FLUSH,
2521 "RCPT TO:<%s>%s%s\r\n", rcpt_addr, sx->igquotstr, sx->buffer);
2523 if (count < 0) return -5;
2526 switch(sync_responses(sx, count, 0))
2528 case 3: sx->ok = TRUE; /* 2xx & 5xx => OK & progress made */
2529 case 2: sx->completed_addr = TRUE; /* 5xx (only) => progress made */
2532 case 1: sx->ok = TRUE; /* 2xx (only) => OK, but if LMTP, */
2533 if (!sx->lmtp) /* can't tell about progress yet */
2534 sx->completed_addr = TRUE;
2535 case 0: /* No 2xx or 5xx, but no probs */
2538 case -1: return -3; /* Timeout on RCPT */
2539 case -2: return -2; /* non-MAIL read i/o error */
2540 default: return -1; /* any MAIL error */
2542 sx->pending_MAIL = FALSE; /* Dealt with MAIL */
2544 } /* Loop for next address */
2546 sx->next_addr = addr;
2552 /*****************************************************
2553 * Proxy TLS connection for another transport process *
2554 ******************************************************/
2556 Use the given buffer as a staging area, and select on both the given fd
2557 and the TLS'd client-fd for data to read (per the coding in ip_recv() and
2558 fd_ready() this is legitimate). Do blocking full-size writes, and reads
2562 buf space to use for buffering
2563 bufsiz size of buffer
2564 proxy_fd comms to proxied process
2565 timeout per-read timeout, seconds
2569 smtp_proxy_tls(uschar * buf, size_t bsize, int proxy_fd, int timeout)
2572 int max_fd = MAX(proxy_fd, tls_out.active) + 1;
2573 int rc, i, fd_bits, nbytes;
2575 set_process_info("proxying TLS connection for continued transport");
2577 FD_SET(tls_out.active, &fds);
2578 FD_SET(proxy_fd, &fds);
2580 for (fd_bits = 3; fd_bits; )
2582 time_t time_left = timeout;
2583 time_t time_start = time(NULL);
2588 struct timeval tv = { time_left, 0 };
2590 rc = select(max_fd, (SELECT_ARG2_TYPE *)&fds, NULL, NULL, &tv);
2592 if (rc < 0 && errno == EINTR)
2593 if ((time_left -= time(NULL) - time_start) > 0) continue;
2597 DEBUG(D_transport) if (rc == 0) debug_printf("%s: timed out\n", __FUNCTION__);
2601 while (rc < 0 || !(FD_ISSET(tls_out.active, &fds) || FD_ISSET(proxy_fd, &fds)));
2603 /* handle inbound data */
2604 if (FD_ISSET(tls_out.active, &fds))
2605 if ((rc = tls_read(FALSE, buf, bsize)) <= 0)
2608 FD_CLR(tls_out.active, &fds);
2609 shutdown(proxy_fd, SHUT_WR);
2613 for (nbytes = 0; rc - nbytes > 0; nbytes += i)
2614 if ((i = write(proxy_fd, buf + nbytes, rc - nbytes)) < 0) return;
2616 else if (fd_bits & 1)
2617 FD_SET(tls_out.active, &fds);
2619 /* handle outbound data */
2620 if (FD_ISSET(proxy_fd, &fds))
2621 if ((rc = read(proxy_fd, buf, bsize)) <= 0)
2624 FD_CLR(proxy_fd, &fds);
2625 shutdown(tls_out.active, SHUT_WR);
2629 for (nbytes = 0; rc - nbytes > 0; nbytes += i)
2630 if ((i = tls_write(FALSE, buf + nbytes, rc - nbytes, FALSE)) < 0)
2633 else if (fd_bits & 2)
2634 FD_SET(proxy_fd, &fds);
2640 /*************************************************
2641 * Deliver address list to given host *
2642 *************************************************/
2644 /* If continue_hostname is not null, we get here only when continuing to
2645 deliver down an existing channel. The channel was passed as the standard
2646 input. TLS is never active on a passed channel; the previous process always
2647 closes it down before passing the connection on.
2649 Otherwise, we have to make a connection to the remote host, and do the
2650 initial protocol exchange.
2652 When running as an MUA wrapper, if the sender or any recipient is rejected,
2653 temporarily or permanently, we force failure for all recipients.
2656 addrlist chain of potential addresses to deliver; only those whose
2657 transport_return field is set to PENDING_DEFER are currently
2658 being processed; others should be skipped - they have either
2659 been delivered to an earlier host or IP address, or been
2660 failed by one of them.
2661 host host to deliver to
2662 host_af AF_INET or AF_INET6
2663 defport default TCP/IP port to use if host does not specify, in host
2665 interface interface to bind to, or NULL
2666 tblock transport instance block
2667 message_defer set TRUE if yield is OK, but all addresses were deferred
2668 because of a non-recipient, non-host failure, that is, a
2669 4xx response to MAIL FROM, DATA, or ".". This is a defer
2670 that is specific to the message.
2671 suppress_tls if TRUE, don't attempt a TLS connection - this is set for
2672 a second attempt after TLS initialization fails
2674 Returns: OK - the connection was made and the delivery attempted;
2675 the result for each address is in its data block.
2676 DEFER - the connection could not be made, or something failed
2677 while setting up the SMTP session, or there was a
2678 non-message-specific error, such as a timeout.
2679 ERROR - a filter command is specified for this transport,
2680 and there was a problem setting it up; OR helo_data
2681 or add_headers or authenticated_sender is specified
2682 for this transport, and the string failed to expand
2686 smtp_deliver(address_item *addrlist, host_item *host, int host_af, int defport,
2687 uschar *interface, transport_instance *tblock,
2688 BOOL *message_defer, BOOL suppress_tls)
2694 time_t start_delivery_time = time(NULL);
2696 BOOL pass_message = FALSE;
2697 uschar *message = NULL;
2698 uschar new_message_id[MESSAGE_ID_LENGTH + 1];
2703 suppress_tls = suppress_tls; /* stop compiler warning when no TLS support */
2704 *message_defer = FALSE;
2706 sx.addrlist = addrlist;
2708 sx.host_af = host_af,
2710 sx.interface = interface;
2711 sx.helo_data = NULL;
2715 /* Get the channel set up ready for a message (MAIL FROM being the next
2716 SMTP command to send */
2718 if ((rc = smtp_setup_conn(&sx, suppress_tls)) != OK)
2721 /* If there is a filter command specified for this transport, we can now
2722 set it up. This cannot be done until the identify of the host is known. */
2724 if (tblock->filter_command)
2726 transport_filter_timeout = tblock->filter_timeout;
2728 /* On failure, copy the error to all addresses, abandon the SMTP call, and
2731 if (!transport_set_up_command(&transport_filter_argv,
2732 tblock->filter_command, TRUE, DEFER, addrlist,
2733 string_sprintf("%.50s transport", tblock->name), NULL))
2735 set_errno_nohost(addrlist->next, addrlist->basic_errno, addrlist->message, DEFER,
2741 if ( transport_filter_argv
2742 && *transport_filter_argv
2743 && **transport_filter_argv
2744 && sx.peer_offered & PEER_OFFERED_CHUNKING
2747 sx.peer_offered &= ~PEER_OFFERED_CHUNKING;
2748 DEBUG(D_transport) debug_printf("CHUNKING not usable due to transport filter\n");
2752 sx.first_addr = addrlist;
2754 /* For messages that have more than the maximum number of envelope recipients,
2755 we want to send several transactions down the same SMTP connection. (See
2756 comments in deliver.c as to how this reconciles, heuristically, with
2757 remote_max_parallel.) This optimization was added to Exim after the following
2758 code was already working. The simplest way to put it in without disturbing the
2759 code was to use a goto to jump back to this point when there is another
2760 transaction to handle. */
2763 sx.from_addr = return_path;
2764 sx.sync_addr = sx.first_addr;
2766 sx.send_rset = TRUE;
2767 sx.completed_addr = FALSE;
2770 /* If we are a continued-connection-after-verify the MAIL and RCPT
2771 commands were already sent; do not re-send but do mark the addrs as
2772 having been accepted up to RCPT stage. A traditional cont-conn
2773 always has a sequence number greater than one. */
2775 if (continue_hostname && continue_sequence == 1)
2777 address_item * addr;
2779 sx.peer_offered = smtp_peer_options;
2780 sx.pending_MAIL = FALSE;
2782 sx.next_addr = NULL;
2784 for (addr = addrlist; addr; addr = addr->next)
2785 addr->transport_return = PENDING_OK;
2789 /* Initiate a message transfer. */
2791 switch(smtp_write_mail_and_rcpt_cmds(&sx, &yield))
2794 case -1: case -2: goto RESPONSE_FAILED;
2795 case -3: goto END_OFF;
2796 case -4: goto SEND_QUIT;
2797 default: goto SEND_FAILED;
2800 /* If we are an MUA wrapper, abort if any RCPTs were rejected, either
2801 permanently or temporarily. We should have flushed and synced after the last
2809 for (a = sx.first_addr, cnt = 0; a && cnt < sx.max_rcpt; a = a->next, cnt++)
2810 if (a->transport_return != PENDING_OK)
2812 /*XXX could we find a better errno than 0 here? */
2813 set_errno_nohost(addrlist, 0, a->message, FAIL,
2814 testflag(a, af_pass_message));
2821 /* If ok is TRUE, we know we have got at least one good recipient, and must now
2822 send DATA, but if it is FALSE (in the normal, non-wrapper case), we may still
2823 have a good recipient buffered up if we are pipelining. We don't want to waste
2824 time sending DATA needlessly, so we only send it if either ok is TRUE or if we
2825 are pipelining. The responses are all handled by sync_responses().
2826 If using CHUNKING, do not send a BDAT until we know how big a chunk we want
2829 if ( !(sx.peer_offered & PEER_OFFERED_CHUNKING)
2830 && (sx.ok || (pipelining_active && !mua_wrapper)))
2832 int count = smtp_write_command(&sx.outblock, SCMD_FLUSH, "DATA\r\n");
2834 if (count < 0) goto SEND_FAILED;
2835 switch(sync_responses(&sx, count, sx.ok ? +1 : -1))
2837 case 3: sx.ok = TRUE; /* 2xx & 5xx => OK & progress made */
2838 case 2: sx.completed_addr = TRUE; /* 5xx (only) => progress made */
2841 case 1: sx.ok = TRUE; /* 2xx (only) => OK, but if LMTP, */
2842 if (!sx.lmtp) sx.completed_addr = TRUE; /* can't tell about progress yet */
2843 case 0: break; /* No 2xx or 5xx, but no probs */
2845 case -1: goto END_OFF; /* Timeout on RCPT */
2846 default: goto RESPONSE_FAILED; /* I/O error, or any MAIL/DATA error */
2848 pipelining_active = FALSE;
2849 data_command = string_copy(big_buffer); /* Save for later error message */
2852 /* If there were no good recipients (but otherwise there have been no
2853 problems), just set ok TRUE, since we have handled address-specific errors
2854 already. Otherwise, it's OK to send the message. Use the check/escape mechanism
2855 for handling the SMTP dot-handling protocol, flagging to apply to headers as
2856 well as body. Set the appropriate timeout value to be used for each chunk.
2857 (Haven't been able to make it work using select() for writing yet.) */
2859 if (!(sx.peer_offered & PEER_OFFERED_CHUNKING) && !sx.ok)
2861 /* Save the first address of the next batch. */
2862 sx.first_addr = sx.next_addr;
2868 transport_ctx tctx = {
2872 US".", US"..", /* Escaping strings */
2873 topt_use_crlf | topt_escape_headers
2874 | (tblock->body_only ? topt_no_headers : 0)
2875 | (tblock->headers_only ? topt_no_body : 0)
2876 | (tblock->return_path_add ? topt_add_return_path : 0)
2877 | (tblock->delivery_date_add ? topt_add_delivery_date : 0)
2878 | (tblock->envelope_to_add ? topt_add_envelope_to : 0)
2881 /* If using CHUNKING we need a callback from the generic transport
2882 support to us, for the sending of BDAT smtp commands and the reaping
2883 of responses. The callback needs a whole bunch of state so set up
2884 a transport-context structure to be passed around. */
2886 if (sx.peer_offered & PEER_OFFERED_CHUNKING)
2888 tctx.check_string = tctx.escape_string = NULL;
2889 tctx.options |= topt_use_bdat;
2890 tctx.chunk_cb = smtp_chunk_cmd_callback;
2891 sx.pending_BDAT = FALSE;
2892 sx.good_RCPT = sx.ok;
2894 tctx.smtp_context = &sx;
2897 tctx.options |= topt_end_dot;
2899 /* Save the first address of the next batch. */
2900 sx.first_addr = sx.next_addr;
2902 /* Responses from CHUNKING commands go in buffer. Otherwise,
2903 there has not been a response. */
2907 sigalrm_seen = FALSE;
2908 transport_write_timeout = sx.ob->data_timeout;
2909 smtp_command = US"sending data block"; /* For error messages */
2910 DEBUG(D_transport|D_v)
2911 if (sx.peer_offered & PEER_OFFERED_CHUNKING)
2912 debug_printf(" will write message using CHUNKING\n");
2914 debug_printf(" SMTP>> writing message and terminating \".\"\n");
2915 transport_count = 0;
2917 #ifndef DISABLE_DKIM
2918 sx.ok = dkim_transport_write_message(&tctx, &sx.ob->dkim, CUSS &message);
2920 sx.ok = transport_write_message(&tctx, 0);
2923 /* transport_write_message() uses write() because it is called from other
2924 places to write to non-sockets. This means that under some OS (e.g. Solaris)
2925 it can exit with "Broken pipe" as its error. This really means that the
2926 socket got closed at the far end. */
2928 transport_write_timeout = 0; /* for subsequent transports */
2930 /* Failure can either be some kind of I/O disaster (including timeout),
2931 or the failure of a transport filter or the expansion of added headers.
2932 Or, when CHUNKING, it can be a protocol-detected failure. */
2935 if (message) goto SEND_FAILED;
2936 else goto RESPONSE_FAILED;
2938 /* We used to send the terminating "." explicitly here, but because of
2939 buffering effects at both ends of TCP/IP connections, you don't gain
2940 anything by keeping it separate, so it might as well go in the final
2941 data buffer for efficiency. This is now done by setting the topt_end_dot
2944 smtp_command = US"end of data";
2946 if (sx.peer_offered & PEER_OFFERED_CHUNKING && sx.cmd_count > 1)
2948 /* Reap any outstanding MAIL & RCPT commands, but not a DATA-go-ahead */
2949 switch(sync_responses(&sx, sx.cmd_count-1, 0))
2951 case 3: sx.ok = TRUE; /* 2xx & 5xx => OK & progress made */
2952 case 2: sx.completed_addr = TRUE; /* 5xx (only) => progress made */
2955 case 1: sx.ok = TRUE; /* 2xx (only) => OK, but if LMTP, */
2956 if (!sx.lmtp) sx.completed_addr = TRUE; /* can't tell about progress yet */
2957 case 0: break; /* No 2xx or 5xx, but no probs */
2959 case -1: goto END_OFF; /* Timeout on RCPT */
2960 default: goto RESPONSE_FAILED; /* I/O error, or any MAIL/DATA error */
2964 #ifndef DISABLE_PRDR
2965 /* For PRDR we optionally get a partial-responses warning
2966 * followed by the individual responses, before going on with
2967 * the overall response. If we don't get the warning then deal
2968 * with per non-PRDR. */
2971 sx.ok = smtp_read_response(&sx.inblock, sx.buffer, sizeof(sx.buffer), '3',
2972 sx.ob->final_timeout);
2973 if (!sx.ok && errno == 0) switch(sx.buffer[0])
2975 case '2': sx.prdr_active = FALSE;
2978 case '4': errno = ERRNO_DATA4XX;
2979 addrlist->more_errno |=
2980 ((sx.buffer[1] - '0')*10 + sx.buffer[2] - '0') << 8;
2987 /* For non-PRDR SMTP, we now read a single response that applies to the
2988 whole message. If it is OK, then all the addresses have been delivered. */
2992 sx.ok = smtp_read_response(&sx.inblock, sx.buffer, sizeof(sx.buffer), '2',
2993 sx.ob->final_timeout);
2994 if (!sx.ok && errno == 0 && sx.buffer[0] == '4')
2996 errno = ERRNO_DATA4XX;
2997 addrlist->more_errno |= ((sx.buffer[1] - '0')*10 + sx.buffer[2] - '0') << 8;
3001 /* For LMTP, we get back a response for every RCPT command that we sent;
3002 some may be accepted and some rejected. For those that get a response, their
3003 status is fixed; any that are accepted have been handed over, even if later
3004 responses crash - at least, that's how I read RFC 2033.
3006 If all went well, mark the recipient addresses as completed, record which
3007 host/IPaddress they were delivered to, and cut out RSET when sending another
3008 message down the same channel. Write the completed addresses to the journal
3009 now so that they are recorded in case there is a crash of hardware or
3010 software before the spool gets updated. Also record the final SMTP
3011 confirmation if needed (for SMTP only). */
3016 int delivery_time = (int)(time(NULL) - start_delivery_time);
3018 uschar *conf = NULL;
3020 sx.send_rset = FALSE;
3021 pipelining_active = FALSE;
3023 /* Set up confirmation if needed - applies only to SMTP */
3026 #ifdef DISABLE_EVENT
3027 LOGGING(smtp_confirmation) &&
3032 const uschar *s = string_printing(sx.buffer);
3033 /* deconst cast ok here as string_printing was checked to have alloc'n'copied */
3034 conf = (s == sx.buffer)? (uschar *)string_copy(s) : US s;
3037 /* Process all transported addresses - for LMTP or PRDR, read a status for
3040 for (addr = addrlist; addr != sx.first_addr; addr = addr->next)
3042 if (addr->transport_return != PENDING_OK) continue;
3044 /* LMTP - if the response fails badly (e.g. timeout), use it for all the
3045 remaining addresses. Otherwise, it's a return code for just the one
3046 address. For temporary errors, add a retry item for the address so that
3047 it doesn't get tried again too soon. */
3049 #ifndef DISABLE_PRDR
3050 if (sx.lmtp || sx.prdr_active)
3055 if (!smtp_read_response(&sx.inblock, sx.buffer, sizeof(sx.buffer), '2',
3056 sx.ob->final_timeout))
3058 if (errno != 0 || sx.buffer[0] == 0) goto RESPONSE_FAILED;
3059 addr->message = string_sprintf(
3060 #ifndef DISABLE_PRDR
3061 "%s error after %s: %s", sx.prdr_active ? "PRDR":"LMTP",
3063 "LMTP error after %s: %s",
3065 data_command, string_printing(sx.buffer));
3066 setflag(addr, af_pass_message); /* Allow message to go to user */
3067 if (sx.buffer[0] == '5')
3068 addr->transport_return = FAIL;
3071 errno = ERRNO_DATA4XX;
3072 addr->more_errno |= ((sx.buffer[1] - '0')*10 + sx.buffer[2] - '0') << 8;
3073 addr->transport_return = DEFER;
3074 #ifndef DISABLE_PRDR
3075 if (!sx.prdr_active)
3077 retry_add_item(addr, addr->address_retry_key, 0);
3081 sx.completed_addr = TRUE; /* NOW we can set this flag */
3082 if (LOGGING(smtp_confirmation))
3084 const uschar *s = string_printing(sx.buffer);
3085 /* deconst cast ok here as string_printing was checked to have alloc'n'copied */
3086 conf = (s == sx.buffer) ? US string_copy(s) : US s;
3090 /* SMTP, or success return from LMTP for this address. Pass back the
3091 actual host that was used. */
3093 addr->transport_return = OK;
3094 addr->more_errno = delivery_time;
3095 addr->host_used = host;
3096 addr->special_action = flag;
3097 addr->message = conf;
3098 #ifndef DISABLE_PRDR
3099 if (sx.prdr_active) addr->flags |= af_prdr_used;
3101 if (sx.peer_offered & PEER_OFFERED_CHUNKING) addr->flags |= af_chunking_used;
3104 #ifndef DISABLE_PRDR
3105 if (!sx.prdr_active)
3108 /* Update the journal. For homonymic addresses, use the base address plus
3109 the transport name. See lots of comments in deliver.c about the reasons
3110 for the complications when homonyms are involved. Just carry on after
3111 write error, as it may prove possible to update the spool file later. */
3113 if (testflag(addr, af_homonym))
3114 sprintf(CS sx.buffer, "%.500s/%s\n", addr->unique + 3, tblock->name);
3116 sprintf(CS sx.buffer, "%.500s\n", addr->unique);
3118 DEBUG(D_deliver) debug_printf("S:journalling %s\n", sx.buffer);
3119 len = Ustrlen(CS sx.buffer);
3120 if (write(journal_fd, sx.buffer, len) != len)
3121 log_write(0, LOG_MAIN|LOG_PANIC, "failed to write journal for "
3122 "%s: %s", sx.buffer, strerror(errno));
3126 #ifndef DISABLE_PRDR
3129 /* PRDR - get the final, overall response. For any non-success
3130 upgrade all the address statuses. */
3131 sx.ok = smtp_read_response(&sx.inblock, sx.buffer, sizeof(sx.buffer), '2',
3132 sx.ob->final_timeout);
3135 if(errno == 0 && sx.buffer[0] == '4')
3137 errno = ERRNO_DATA4XX;
3138 addrlist->more_errno |= ((sx.buffer[1] - '0')*10 + sx.buffer[2] - '0') << 8;
3140 for (addr = addrlist; addr != sx.first_addr; addr = addr->next)
3141 if (sx.buffer[0] == '5' || addr->transport_return == OK)
3142 addr->transport_return = PENDING_OK; /* allow set_errno action */
3143 goto RESPONSE_FAILED;
3146 /* Update the journal, or setup retry. */
3147 for (addr = addrlist; addr != sx.first_addr; addr = addr->next)
3148 if (addr->transport_return == OK)
3150 if (testflag(addr, af_homonym))
3151 sprintf(CS sx.buffer, "%.500s/%s\n", addr->unique + 3, tblock->name);
3153 sprintf(CS sx.buffer, "%.500s\n", addr->unique);
3155 DEBUG(D_deliver) debug_printf("journalling(PRDR) %s\n", sx.buffer);
3156 len = Ustrlen(CS sx.buffer);
3157 if (write(journal_fd, sx.buffer, len) != len)
3158 log_write(0, LOG_MAIN|LOG_PANIC, "failed to write journal for "
3159 "%s: %s", sx.buffer, strerror(errno));
3161 else if (addr->transport_return == DEFER)
3162 retry_add_item(addr, addr->address_retry_key, -2);
3166 /* Ensure the journal file is pushed out to disk. */
3168 if (EXIMfsync(journal_fd) < 0)
3169 log_write(0, LOG_MAIN|LOG_PANIC, "failed to fsync journal: %s",
3175 /* Handle general (not specific to one address) failures here. The value of ok
3176 is used to skip over this code on the falling through case. A timeout causes a
3177 deferral. Other errors may defer or fail according to the response code, and
3178 may set up a special errno value, e.g. after connection chopped, which is
3179 assumed if errno == 0 and there is no text in the buffer. If control reaches
3180 here during the setting up phase (i.e. before MAIL FROM) then always defer, as
3181 the problem is not related to this specific message. */
3186 uschar * set_message;
3192 sx.send_quit = check_response(host, &save_errno, addrlist->more_errno,
3193 sx.buffer, &code, &message, &pass_message);
3201 message = string_sprintf("send() to %s [%s] failed: %s",
3202 host->name, host->address, message ? message : US strerror(save_errno));
3203 sx.send_quit = FALSE;
3211 sx.ok = FALSE; /* For when reached by GOTO */
3212 set_message = message;
3214 /* We want to handle timeouts after MAIL or "." and loss of connection after
3215 "." specially. They can indicate a problem with the sender address or with
3216 the contents of the message rather than a real error on the connection. These
3217 cases are treated in the same way as a 4xx response. This next bit of code
3218 does the classification. */
3225 message_error = TRUE;
3229 message_error = Ustrncmp(smtp_command,"MAIL",4) == 0 ||
3230 Ustrncmp(smtp_command,"end ",4) == 0;
3233 case ERRNO_SMTPCLOSED:
3234 message_error = Ustrncmp(smtp_command,"end ",4) == 0;
3238 message_error = FALSE;
3242 /* Handle the cases that are treated as message errors. These are:
3244 (a) negative response or timeout after MAIL
3245 (b) negative response after DATA
3246 (c) negative response or timeout or dropped connection after "."
3247 (d) utf8 support required and not offered
3249 It won't be a negative response or timeout after RCPT, as that is dealt
3250 with separately above. The action in all cases is to set an appropriate
3251 error code for all the addresses, but to leave yield set to OK because the
3252 host itself has not failed. Of course, it might in practice have failed
3253 when we've had a timeout, but if so, we'll discover that at the next
3254 delivery attempt. For a temporary error, set the message_defer flag, and
3255 write to the logs for information if this is not the last host. The error
3256 for the last host will be logged as part of the address's log line. */
3260 if (mua_wrapper) code = '5'; /* Force hard failure in wrapper mode */
3262 /* If there's an errno, the message contains just the identity of
3267 else /* Anything other than 5 is treated as temporary */
3271 message = US string_sprintf("%s: %s", message, strerror(save_errno));
3272 if (host->next != NULL) log_write(0, LOG_MAIN, "%s", message);
3273 msglog_line(host, message);
3274 *message_defer = TRUE;
3278 /* Otherwise, we have an I/O error or a timeout other than after MAIL or
3279 ".", or some other transportation error. We defer all addresses and yield
3280 DEFER, except for the case of failed add_headers expansion, or a transport
3281 filter failure, when the yield should be ERROR, to stop it trying other
3287 yield = (save_errno == ERRNO_CHHEADER_FAIL ||
3288 save_errno == ERRNO_FILTER_FAIL)? ERROR : DEFER;
3292 set_errno(addrlist, save_errno, set_message, set_rc, pass_message, host
3293 #ifdef EXPERIMENTAL_DSN_INFO
3294 , sx.smtp_greeting, sx.helo_response
3300 /* If all has gone well, send_quit will be set TRUE, implying we can end the
3301 SMTP session tidily. However, if there were too many addresses to send in one
3302 message (indicated by first_addr being non-NULL) we want to carry on with the
3303 rest of them. Also, it is desirable to send more than one message down the SMTP
3304 connection if there are several waiting, provided we haven't already sent so
3305 many as to hit the configured limit. The function transport_check_waiting looks
3306 for a waiting message and returns its id. Then transport_pass_socket tries to
3307 set up a continued delivery by passing the socket on to another process. The
3308 variable send_rset is FALSE if a message has just been successfully transfered.
3310 If we are already sending down a continued channel, there may be further
3311 addresses not yet delivered that are aimed at the same host, but which have not
3312 been passed in this run of the transport. In this case, continue_more will be
3313 true, and all we should do is send RSET if necessary, and return, leaving the
3316 However, if no address was disposed of, i.e. all addresses got 4xx errors, we
3317 do not want to continue with other messages down the same channel, because that
3318 can lead to looping between two or more messages, all with the same,
3319 temporarily failing address(es). [The retry information isn't updated yet, so
3320 new processes keep on trying.] We probably also don't want to try more of this
3321 message's addresses either.
3323 If we have started a TLS session, we have to end it before passing the
3324 connection to a new process. However, not all servers can handle this (Exim
3325 can), so we do not pass such a connection on if the host matches
3326 hosts_nopass_tls. */
3329 debug_printf("ok=%d send_quit=%d send_rset=%d continue_more=%d "
3330 "yield=%d first_address is %sNULL\n", sx.ok, sx.send_quit,
3331 sx.send_rset, continue_more, yield, sx.first_addr ? "not " : "");
3333 if (sx.completed_addr && sx.ok && sx.send_quit)
3336 smtp_compare_t t_compare;
3338 t_compare.tblock = tblock;
3339 t_compare.current_sender_address = sender_address;
3341 if ( sx.first_addr != NULL
3345 ( tls_out.active < 0 && !continue_proxy_cipher
3346 || verify_check_given_host(&sx.ob->hosts_nopass_tls, host) != OK
3350 transport_check_waiting(tblock->name, host->name,
3351 tblock->connection_max_messages, new_message_id, &more,
3352 (oicf)smtp_are_same_identities, (void*)&t_compare)
3359 if (! (sx.ok = smtp_write_command(&sx.outblock, SCMD_FLUSH, "RSET\r\n") >= 0))
3361 msg = US string_sprintf("send() to %s [%s] failed: %s", host->name,
3362 host->address, strerror(errno));
3363 sx.send_quit = FALSE;
3365 else if (! (sx.ok = smtp_read_response(&sx.inblock, sx.buffer,
3366 sizeof(sx.buffer), '2', sx.ob->command_timeout)))
3369 sx.send_quit = check_response(host, &errno, 0, sx.buffer, &code, &msg,
3373 DEBUG(D_transport) debug_printf("H=%s [%s] %s\n",
3374 host->name, host->address, msg);
3378 /* Either RSET was not needed, or it succeeded */
3383 int socket_fd = sx.inblock.sock;
3386 if (sx.first_addr != NULL) /* More addresses still to be sent */
3387 { /* in this run of the transport */
3388 continue_sequence++; /* Causes * in logging */
3392 /* Unless caller said it already has more messages listed for this host,
3393 pass the connection on to a new Exim process (below, the call to
3394 transport_pass_socket). If the caller has more ready, just return with
3395 the connection still open. */
3398 if (tls_out.active >= 0)
3400 || verify_check_given_host(&sx.ob->hosts_noproxy_tls, host) == OK)
3402 /* Before passing the socket on, or returning to caller with it still
3403 open, we must shut down TLS. Not all MTAs allow for the continuation
3404 of the SMTP session when TLS is shut down. We test for this by sending
3405 a new EHLO. If we don't get a good response, we don't attempt to pass
3408 tls_close(FALSE, TRUE);
3409 smtp_peer_options = smtp_peer_options_wrap;
3411 && smtp_write_command(&sx.outblock, SCMD_FLUSH,
3412 "EHLO %s\r\n", sx.helo_data) >= 0
3413 && smtp_read_response(&sx.inblock, sx.buffer, sizeof(sx.buffer),
3414 '2', sx.ob->command_timeout);
3416 if (sx.ok && continue_more)
3417 return yield; /* More addresses for another run */
3421 /* Set up a pipe for proxying TLS for the new transport process */
3423 smtp_peer_options |= PEER_OFFERED_TLS;
3424 if (sx.ok = (socketpair(AF_UNIX, SOCK_STREAM, 0, pfd) == 0))
3427 set_errno(sx.first_addr, errno, US"internal allocation problem",
3429 # ifdef EXPERIMENTAL_DSN_INFO
3430 , sx.smtp_greeting, sx.helo_response
3437 return yield; /* More addresses for another run */
3439 /* If the socket is successfully passed, we mustn't send QUIT (or
3440 indeed anything!) from here. */
3442 /*XXX DSN_INFO: assume likely to do new HELO; but for greet we'll want to
3443 propagate it from the initial
3445 if (sx.ok && transport_pass_socket(tblock->name, host->name,
3446 host->address, new_message_id, socket_fd))
3448 sx.send_quit = FALSE;
3450 /* If TLS is still active, we need to proxy it for the transport we
3451 just passed the baton to. Fork a child to to do it, and return to
3452 get logging done asap. Which way to place the work makes assumptions
3453 about post-fork prioritisation which may not hold on all platforms. */
3455 if (tls_out.active >= 0)
3458 if (pid > 0) /* parent */
3460 DEBUG(D_transport) debug_printf("proxy-proc inter-pid %d\n", pid);
3461 waitpid(pid, NULL, 0);
3462 tls_close(FALSE, FALSE);
3463 (void)close(sx.inblock.sock);
3464 continue_transport = NULL;
3465 continue_hostname = NULL;
3468 else if (pid == 0) /* child; fork again to disconnect totally */
3472 DEBUG(D_transport) debug_printf("proxy-prox final-pid %d\n", pid);
3473 _exit(pid ? EXIT_FAILURE : EXIT_SUCCESS);
3475 smtp_proxy_tls(sx.buffer, sizeof(sx.buffer), pfd[0], sx.ob->command_timeout);
3483 /* If RSET failed and there are addresses left, they get deferred. */
3485 set_errno(sx.first_addr, errno, msg, DEFER, FALSE, host
3486 #ifdef EXPERIMENTAL_DSN_INFO
3487 , sx.smtp_greeting, sx.helo_response
3493 /* End off tidily with QUIT unless the connection has died or the socket has
3494 been passed to another process. There has been discussion on the net about what
3495 to do after sending QUIT. The wording of the RFC suggests that it is necessary
3496 to wait for a response, but on the other hand, there isn't anything one can do
3497 with an error response, other than log it. Exim used to do that. However,
3498 further discussion suggested that it is positively advantageous not to wait for
3499 the response, but to close the session immediately. This is supposed to move
3500 the TCP/IP TIME_WAIT state from the server to the client, thereby removing some
3501 load from the server. (Hosts that are both servers and clients may not see much
3502 difference, of course.) Further discussion indicated that this was safe to do
3503 on Unix systems which have decent implementations of TCP/IP that leave the
3504 connection around for a while (TIME_WAIT) after the application has gone away.
3505 This enables the response sent by the server to be properly ACKed rather than
3506 timed out, as can happen on broken TCP/IP implementations on other OS.
3508 This change is being made on 31-Jul-98. After over a year of trouble-free
3509 operation, the old commented-out code was removed on 17-Sep-99. */
3512 if (sx.send_quit) (void)smtp_write_command(&sx.outblock, SCMD_FLUSH, "QUIT\r\n");
3517 tls_close(FALSE, TRUE);
3520 /* Close the socket, and return the appropriate value, first setting
3521 works because the NULL setting is passed back to the calling process, and
3522 remote_max_parallel is forced to 1 when delivering over an existing connection,
3524 If all went well and continue_more is set, we shouldn't actually get here if
3525 there are further addresses, as the return above will be taken. However,
3526 writing RSET might have failed, or there may be other addresses whose hosts are
3527 specified in the transports, and therefore not visible at top level, in which
3528 case continue_more won't get set. */
3530 HDEBUG(D_transport|D_acl|D_v) debug_printf_indent(" SMTP(close)>>\n");
3533 shutdown(sx.outblock.sock, SHUT_WR);
3534 if (fcntl(sx.inblock.sock, F_SETFL, O_NONBLOCK) == 0)
3535 for (rc = 16; read(sx.inblock.sock, sx.inbuffer, sizeof(sx.inbuffer)) > 0 && rc > 0;)
3536 rc--; /* drain socket */
3538 (void)close(sx.inblock.sock);
3540 #ifndef DISABLE_EVENT
3541 (void) event_raise(tblock->event_action, US"tcp:close", NULL);
3544 continue_transport = NULL;
3545 continue_hostname = NULL;
3552 /*************************************************
3553 * Closedown entry point *
3554 *************************************************/
3556 /* This function is called when exim is passed an open smtp channel
3557 from another incarnation, but the message which it has been asked
3558 to deliver no longer exists. The channel is on stdin.
3560 We might do fancy things like looking for another message to send down
3561 the channel, but if the one we sought has gone, it has probably been
3562 delivered by some other process that itself will seek further messages,
3563 so just close down our connection.
3565 Argument: pointer to the transport instance block
3570 smtp_transport_closedown(transport_instance *tblock)
3572 smtp_transport_options_block *ob =
3573 (smtp_transport_options_block *)tblock->options_block;
3574 smtp_inblock inblock;
3575 smtp_outblock outblock;
3577 uschar inbuffer[4096];
3578 uschar outbuffer[16];
3580 inblock.sock = fileno(stdin);
3581 inblock.buffer = inbuffer;
3582 inblock.buffersize = sizeof(inbuffer);
3583 inblock.ptr = inbuffer;
3584 inblock.ptrend = inbuffer;
3586 outblock.sock = inblock.sock;
3587 outblock.buffersize = sizeof(outbuffer);
3588 outblock.buffer = outbuffer;
3589 outblock.ptr = outbuffer;
3590 outblock.cmd_count = 0;
3591 outblock.authenticating = FALSE;
3593 (void)smtp_write_command(&outblock, SCMD_FLUSH, "QUIT\r\n");
3594 (void)smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
3595 ob->command_timeout);
3596 (void)close(inblock.sock);
3601 /*************************************************
3602 * Prepare addresses for delivery *
3603 *************************************************/
3605 /* This function is called to flush out error settings from previous delivery
3606 attempts to other hosts. It also records whether we got here via an MX record
3607 or not in the more_errno field of the address. We are interested only in
3608 addresses that are still marked DEFER - others may have got delivered to a
3609 previously considered IP address. Set their status to PENDING_DEFER to indicate
3610 which ones are relevant this time.
3613 addrlist the list of addresses
3614 host the host we are delivering to
3616 Returns: the first address for this delivery
3619 static address_item *
3620 prepare_addresses(address_item *addrlist, host_item *host)
3622 address_item *first_addr = NULL;
3624 for (addr = addrlist; addr; addr = addr->next)
3625 if (addr->transport_return == DEFER)
3627 if (!first_addr) first_addr = addr;
3628 addr->transport_return = PENDING_DEFER;
3629 addr->basic_errno = 0;
3630 addr->more_errno = (host->mx >= 0)? 'M' : 'A';
3631 addr->message = NULL;
3633 addr->cipher = NULL;
3634 addr->ourcert = NULL;
3635 addr->peercert = NULL;
3636 addr->peerdn = NULL;
3637 addr->ocsp = OCSP_NOT_REQ;
3639 #ifdef EXPERIMENTAL_DSN_INFO
3640 addr->smtp_greeting = NULL;
3641 addr->helo_response = NULL;
3649 /*************************************************
3650 * Main entry point *
3651 *************************************************/
3653 /* See local README for interface details. As this is a remote transport, it is
3654 given a chain of addresses to be delivered in one connection, if possible. It
3655 always returns TRUE, indicating that each address has its own independent
3656 status set, except if there is a setting up problem, in which case it returns
3660 smtp_transport_entry(
3661 transport_instance *tblock, /* data for this instantiation */
3662 address_item *addrlist) /* addresses we are working on */
3666 int hosts_defer = 0;
3668 int hosts_looked_up = 0;
3669 int hosts_retry = 0;
3670 int hosts_serial = 0;
3671 int hosts_total = 0;
3672 int total_hosts_tried = 0;
3674 BOOL expired = TRUE;
3675 uschar *expanded_hosts = NULL;
3677 uschar *tid = string_sprintf("%s transport", tblock->name);
3678 smtp_transport_options_block *ob =
3679 (smtp_transport_options_block *)(tblock->options_block);
3680 host_item *hostlist = addrlist->host_list;
3681 host_item *host = NULL;
3685 debug_printf("%s transport entered\n", tblock->name);
3686 for (addr = addrlist; addr; addr = addr->next)
3687 debug_printf(" %s\n", addr->address);
3690 debug_printf("hostlist:\n");
3691 for (host = hostlist; host; host = host->next)
3692 debug_printf(" %s:%d\n", host->name, host->port);
3694 if (continue_hostname)
3695 debug_printf("already connected to %s [%s] (on fd %d)\n",
3696 continue_hostname, continue_host_address,
3697 cutthrough.fd >= 0 ? cutthrough.fd : 0);
3700 /* Set the flag requesting that these hosts be added to the waiting
3701 database if the delivery fails temporarily or if we are running with
3702 queue_smtp or a 2-stage queue run. This gets unset for certain
3703 kinds of error, typically those that are specific to the message. */
3705 update_waiting = TRUE;
3707 /* If a host list is not defined for the addresses - they must all have the
3708 same one in order to be passed to a single transport - or if the transport has
3709 a host list with hosts_override set, use the host list supplied with the
3710 transport. It is an error for this not to exist. */
3712 if (!hostlist || (ob->hosts_override && ob->hosts))
3716 addrlist->message = string_sprintf("%s transport called with no hosts set",
3718 addrlist->transport_return = PANIC;
3719 return FALSE; /* Only top address has status */
3722 DEBUG(D_transport) debug_printf("using the transport's hosts: %s\n",
3725 /* If the transport's host list contains no '$' characters, and we are not
3726 randomizing, it is fixed and therefore a chain of hosts can be built once
3727 and for all, and remembered for subsequent use by other calls to this
3728 transport. If, on the other hand, the host list does contain '$', or we are
3729 randomizing its order, we have to rebuild it each time. In the fixed case,
3730 as the hosts string will never be used again, it doesn't matter that we
3731 replace all the : characters with zeros. */
3735 uschar *s = ob->hosts;
3737 if (Ustrchr(s, '$') != NULL)
3739 if (!(expanded_hosts = expand_string(s)))
3741 addrlist->message = string_sprintf("failed to expand list of hosts "
3742 "\"%s\" in %s transport: %s", s, tblock->name, expand_string_message);
3743 addrlist->transport_return = search_find_defer ? DEFER : PANIC;
3744 return FALSE; /* Only top address has status */
3746 DEBUG(D_transport) debug_printf("expanded list of hosts \"%s\" to "
3747 "\"%s\"\n", s, expanded_hosts);
3751 if (ob->hosts_randomize) s = expanded_hosts = string_copy(s);
3753 host_build_hostlist(&hostlist, s, ob->hosts_randomize);
3755 /* Check that the expansion yielded something useful. */
3759 string_sprintf("%s transport has empty hosts setting", tblock->name);
3760 addrlist->transport_return = PANIC;
3761 return FALSE; /* Only top address has status */
3764 /* If there was no expansion of hosts, save the host list for
3767 if (!expanded_hosts) ob->hostlist = hostlist;
3770 /* This is not the first time this transport has been run in this delivery;
3771 the host list was built previously. */
3774 hostlist = ob->hostlist;
3777 /* The host list was supplied with the address. If hosts_randomize is set, we
3778 must sort it into a random order if it did not come from MX records and has not
3779 already been randomized (but don't bother if continuing down an existing
3782 else if (ob->hosts_randomize && hostlist->mx == MX_NONE && !continue_hostname)
3784 host_item *newlist = NULL;
3787 host_item *h = hostlist;
3788 hostlist = hostlist->next;
3790 h->sort_key = random_number(100);
3797 else if (h->sort_key < newlist->sort_key)
3804 host_item *hh = newlist;
3807 if (h->sort_key < hh->next->sort_key) break;
3815 hostlist = addrlist->host_list = newlist;
3818 /* Sort out the default port. */
3820 if (!smtp_get_port(ob->port, addrlist, &defport, tid)) return FALSE;
3822 /* For each host-plus-IP-address on the list:
3824 . If this is a continued delivery and the host isn't the one with the
3825 current connection, skip.
3827 . If the status is unusable (i.e. previously failed or retry checked), skip.
3829 . If no IP address set, get the address, either by turning the name into
3830 an address, calling gethostbyname if gethostbyname is on, or by calling
3831 the DNS. The DNS may yield multiple addresses, in which case insert the
3832 extra ones into the list.
3834 . Get the retry data if not previously obtained for this address and set the
3835 field which remembers the state of this address. Skip if the retry time is
3836 not reached. If not, remember whether retry data was found. The retry string
3837 contains both the name and the IP address.
3839 . Scan the list of addresses and mark those whose status is DEFER as
3840 PENDING_DEFER. These are the only ones that will be processed in this cycle
3843 . Make a delivery attempt - addresses marked PENDING_DEFER will be tried.
3844 Some addresses may be successfully delivered, others may fail, and yet
3845 others may get temporary errors and so get marked DEFER.
3847 . The return from the delivery attempt is OK if a connection was made and a
3848 valid SMTP dialogue was completed. Otherwise it is DEFER.
3850 . If OK, add a "remove" retry item for this host/IPaddress, if any.
3852 . If fail to connect, or other defer state, add a retry item.
3854 . If there are any addresses whose status is still DEFER, carry on to the
3855 next host/IPaddress, unless we have tried the number of hosts given
3856 by hosts_max_try or hosts_max_try_hardlimit; otherwise return. Note that
3857 there is some fancy logic for hosts_max_try that means its limit can be
3858 overstepped in some circumstances.
3860 If we get to the end of the list, all hosts have deferred at least one address,
3861 or not reached their retry times. If delay_after_cutoff is unset, it requests a
3862 delivery attempt to those hosts whose last try was before the arrival time of
3863 the current message. To cope with this, we have to go round the loop a second
3864 time. After that, set the status and error data for any addresses that haven't
3865 had it set already. */
3867 for (cutoff_retry = 0;
3868 expired && cutoff_retry < (ob->delay_after_cutoff ? 1 : 2);
3871 host_item *nexthost = NULL;
3872 int unexpired_hosts_tried = 0;
3874 for (host = hostlist;
3876 && unexpired_hosts_tried < ob->hosts_max_try
3877 && total_hosts_tried < ob->hosts_max_try_hardlimit;
3883 BOOL host_is_expired = FALSE;
3884 BOOL message_defer = FALSE;
3885 BOOL some_deferred = FALSE;
3886 address_item *first_addr = NULL;
3887 uschar *interface = NULL;
3888 uschar *retry_host_key = NULL;
3889 uschar *retry_message_key = NULL;
3890 uschar *serialize_key = NULL;
3892 /* Default next host is next host. :-) But this can vary if the
3893 hosts_max_try limit is hit (see below). It may also be reset if a host
3894 address is looked up here (in case the host was multihomed). */
3896 nexthost = host->next;
3898 /* If the address hasn't yet been obtained from the host name, look it up
3899 now, unless the host is already marked as unusable. If it is marked as
3900 unusable, it means that the router was unable to find its IP address (in
3901 the DNS or wherever) OR we are in the 2nd time round the cutoff loop, and
3902 the lookup failed last time. We don't get this far if *all* MX records
3903 point to non-existent hosts; that is treated as a hard error.
3905 We can just skip this host entirely. When the hosts came from the router,
3906 the address will timeout based on the other host(s); when the address is
3907 looked up below, there is an explicit retry record added.
3909 Note that we mustn't skip unusable hosts if the address is not unset; they
3910 may be needed as expired hosts on the 2nd time round the cutoff loop. */
3914 int new_port, flags;
3917 if (host->status >= hstatus_unusable)
3919 DEBUG(D_transport) debug_printf("%s has no address and is unusable - skipping\n",
3924 DEBUG(D_transport) debug_printf("getting address for %s\n", host->name);
3926 /* The host name is permitted to have an attached port. Find it, and
3927 strip it from the name. Just remember it for now. */
3929 new_port = host_item_get_port(host);
3931 /* Count hosts looked up */
3935 /* Find by name if so configured, or if it's an IP address. We don't
3936 just copy the IP address, because we need the test-for-local to happen. */
3938 flags = HOST_FIND_BY_A;
3939 if (ob->dns_qualify_single) flags |= HOST_FIND_QUALIFY_SINGLE;
3940 if (ob->dns_search_parents) flags |= HOST_FIND_SEARCH_PARENTS;
3942 if (ob->gethostbyname || string_is_ip_address(host->name, NULL) != 0)
3943 rc = host_find_byname(host, NULL, flags, NULL, TRUE);
3945 rc = host_find_bydns(host, NULL, flags, NULL, NULL, NULL,
3946 &ob->dnssec, /* domains for request/require */
3949 /* Update the host (and any additional blocks, resulting from
3950 multihoming) with a host-specific port, if any. */
3952 for (hh = host; hh != nexthost; hh = hh->next) hh->port = new_port;
3954 /* Failure to find the host at this time (usually DNS temporary failure)
3955 is really a kind of routing failure rather than a transport failure.
3956 Therefore we add a retry item of the routing kind, not to stop us trying
3957 to look this name up here again, but to ensure the address gets timed
3958 out if the failures go on long enough. A complete failure at this point
3959 commonly points to a configuration error, but the best action is still
3960 to carry on for the next host. */
3962 if (rc == HOST_FIND_AGAIN || rc == HOST_FIND_SECURITY || rc == HOST_FIND_FAILED)
3964 retry_add_item(addrlist, string_sprintf("R:%s", host->name), 0);
3966 if (rc == HOST_FIND_AGAIN) hosts_defer++; else hosts_fail++;
3967 DEBUG(D_transport) debug_printf("rc = %s for %s\n", (rc == HOST_FIND_AGAIN)?
3968 "HOST_FIND_AGAIN" : "HOST_FIND_FAILED", host->name);
3969 host->status = hstatus_unusable;
3971 for (addr = addrlist; addr; addr = addr->next)
3973 if (addr->transport_return != DEFER) continue;
3974 addr->basic_errno = ERRNO_UNKNOWNHOST;
3975 addr->message = string_sprintf(
3976 rc == HOST_FIND_SECURITY
3977 ? "lookup of IP address for %s was insecure"
3978 : "failed to lookup IP address for %s",
3984 /* If the host is actually the local host, we may have a problem, or
3985 there may be some cunning configuration going on. In the problem case,
3986 log things and give up. The default transport status is already DEFER. */
3988 if (rc == HOST_FOUND_LOCAL && !ob->allow_localhost)
3990 for (addr = addrlist; addr; addr = addr->next)
3992 addr->basic_errno = 0;
3993 addr->message = string_sprintf("%s transport found host %s to be "
3994 "local", tblock->name, host->name);
3998 } /* End of block for IP address lookup */
4000 /* If this is a continued delivery, we are interested only in the host
4001 which matches the name of the existing open channel. The check is put
4002 here after the local host lookup, in case the name gets expanded as a
4003 result of the lookup. Set expired FALSE, to save the outer loop executing
4006 if ( continue_hostname
4007 && ( Ustrcmp(continue_hostname, host->name) != 0
4008 || Ustrcmp(continue_host_address, host->address) != 0
4012 continue; /* With next host */
4015 /* Reset the default next host in case a multihomed host whose addresses
4016 are not looked up till just above added to the host list. */
4018 nexthost = host->next;
4020 /* If queue_smtp is set (-odqs or the first part of a 2-stage run), or the
4021 domain is in queue_smtp_domains, we don't actually want to attempt any
4022 deliveries. When doing a queue run, queue_smtp_domains is always unset. If
4023 there is a lookup defer in queue_smtp_domains, proceed as if the domain
4024 were not in it. We don't want to hold up all SMTP deliveries! Except when
4025 doing a two-stage queue run, don't do this if forcing. */
4027 if ((!deliver_force || queue_2stage) && (queue_smtp ||
4028 match_isinlist(addrlist->domain,
4029 (const uschar **)&queue_smtp_domains, 0,
4030 &domainlist_anchor, NULL, MCL_DOMAIN, TRUE, NULL) == OK))
4033 for (addr = addrlist; addr; addr = addr->next)
4034 if (addr->transport_return == DEFER)
4035 addr->message = US"domain matches queue_smtp_domains, or -odqs set";
4036 continue; /* With next host */
4039 /* Count hosts being considered - purely for an intelligent comment
4040 if none are usable. */
4044 /* Set $host and $host address now in case they are needed for the
4045 interface expansion or the serialize_hosts check; they remain set if an
4046 actual delivery happens. */
4048 deliver_host = host->name;
4049 deliver_host_address = host->address;
4050 lookup_dnssec_authenticated = host->dnssec == DS_YES ? US"yes"
4051 : host->dnssec == DS_NO ? US"no"
4054 /* Set up a string for adding to the retry key if the port number is not
4055 the standard SMTP port. A host may have its own port setting that overrides
4058 pistring = string_sprintf(":%d", host->port == PORT_NONE
4059 ? defport : host->port);
4060 if (Ustrcmp(pistring, ":25") == 0) pistring = US"";
4062 /* Select IPv4 or IPv6, and choose an outgoing interface. If the interface
4063 string is set, even if constant (as different transports can have different
4064 constant settings), we must add it to the key that is used for retries,
4065 because connections to the same host from a different interface should be
4066 treated separately. */
4068 host_af = Ustrchr(host->address, ':') == NULL ? AF_INET : AF_INET6;
4069 if ((rs = ob->interface) && *rs)
4071 if (!smtp_get_interface(rs, host_af, addrlist, &interface, tid))
4073 pistring = string_sprintf("%s/%s", pistring, interface);
4076 /* The first time round the outer loop, check the status of the host by
4077 inspecting the retry data. The second time round, we are interested only
4078 in expired hosts that haven't been tried since this message arrived. */
4080 if (cutoff_retry == 0)
4083 /* Ensure the status of the address is set by checking retry data if
4084 necessary. There may be host-specific retry data (applicable to all
4085 messages) and also data for retries of a specific message at this host.
4086 If either of these retry records are actually read, the keys used are
4087 returned to save recomputing them later. */
4089 if (exp_bool(addrlist, US"transport", tblock->name, D_transport,
4090 US"retry_include_ip_address", ob->retry_include_ip_address,
4091 ob->expand_retry_include_ip_address, &incl_ip) != OK)
4092 continue; /* with next host */
4094 host_is_expired = retry_check_address(addrlist->domain, host, pistring,
4095 incl_ip, &retry_host_key, &retry_message_key);
4097 DEBUG(D_transport) debug_printf("%s [%s]%s retry-status = %s\n", host->name,
4098 (host->address == NULL)? US"" : host->address, pistring,
4099 (host->status == hstatus_usable)? "usable" :
4100 (host->status == hstatus_unusable)? "unusable" :
4101 (host->status == hstatus_unusable_expired)? "unusable (expired)" : "?");
4103 /* Skip this address if not usable at this time, noting if it wasn't
4104 actually expired, both locally and in the address. */
4106 switch (host->status)
4108 case hstatus_unusable:
4110 setflag(addrlist, af_retry_skipped);
4113 case hstatus_unusable_expired:
4116 case hwhy_retry: hosts_retry++; break;
4117 case hwhy_failed: hosts_fail++; break;
4119 case hwhy_deferred: hosts_defer++; break;
4122 /* If there was a retry message key, implying that previously there
4123 was a message-specific defer, we don't want to update the list of
4124 messages waiting for these hosts. */
4126 if (retry_message_key) update_waiting = FALSE;
4127 continue; /* With the next host or IP address */
4131 /* Second time round the loop: if the address is set but expired, and
4132 the message is newer than the last try, let it through. */
4137 || host->status != hstatus_unusable_expired
4138 || host->last_try > received_time)
4140 DEBUG(D_transport) debug_printf("trying expired host %s [%s]%s\n",
4141 host->name, host->address, pistring);
4142 host_is_expired = TRUE;
4145 /* Setting "expired=FALSE" doesn't actually mean not all hosts are expired;
4146 it remains TRUE only if all hosts are expired and none are actually tried.
4151 /* If this host is listed as one to which access must be serialized,
4152 see if another Exim process has a connection to it, and if so, skip
4153 this host. If not, update the database to record our connection to it
4154 and remember this for later deletion. Do not do any of this if we are
4155 sending the message down a pre-existing connection. */
4157 if ( !continue_hostname
4158 && verify_check_given_host(&ob->serialize_hosts, host) == OK)
4160 serialize_key = string_sprintf("host-serialize-%s", host->name);
4161 if (!enq_start(serialize_key, 1))
4164 debug_printf("skipping host %s because another Exim process "
4165 "is connected to it\n", host->name);
4171 /* OK, we have an IP address that is not waiting for its retry time to
4172 arrive (it might be expired) OR (second time round the loop) we have an
4173 expired host that hasn't been tried since the message arrived. Have a go
4174 at delivering the message to it. First prepare the addresses by flushing
4175 out the result of previous attempts, and finding the first address that
4176 is still to be delivered. */
4178 first_addr = prepare_addresses(addrlist, host);
4180 DEBUG(D_transport) debug_printf("delivering %s to %s [%s] (%s%s)\n",
4181 message_id, host->name, host->address, addrlist->address,
4182 addrlist->next ? ", ..." : "");
4184 set_process_info("delivering %s to %s [%s] (%s%s)",
4185 message_id, host->name, host->address, addrlist->address,
4186 addrlist->next ? ", ..." : "");
4188 /* This is not for real; don't do the delivery. If there are
4189 any remaining hosts, list them. */
4194 set_errno_nohost(addrlist, 0, NULL, OK, FALSE);
4195 for (addr = addrlist; addr; addr = addr->next)
4197 addr->host_used = host;
4198 addr->special_action = '*';
4199 addr->message = US"delivery bypassed by -N option";
4203 debug_printf("*** delivery by %s transport bypassed by -N option\n"
4204 "*** host and remaining hosts:\n", tblock->name);
4205 for (host2 = host; host2; host2 = host2->next)
4206 debug_printf(" %s [%s]\n", host2->name,
4207 host2->address ? host2->address : US"unset");
4212 /* This is for real. If the host is expired, we don't count it for
4213 hosts_max_retry. This ensures that all hosts must expire before an address
4214 is timed out, unless hosts_max_try_hardlimit (which protects against
4215 lunatic DNS configurations) is reached.
4217 If the host is not expired and we are about to hit the hosts_max_retry
4218 limit, check to see if there is a subsequent hosts with a different MX
4219 value. If so, make that the next host, and don't count this one. This is a
4220 heuristic to make sure that different MXs do get tried. With a normal kind
4221 of retry rule, they would get tried anyway when the earlier hosts were
4222 delayed, but if the domain has a "retry every time" type of rule - as is
4223 often used for the the very large ISPs, that won't happen. */
4228 /* Make a copy of the host if it is local to this invocation
4229 of the transport. */
4233 thost = store_get(sizeof(host_item));
4235 thost->name = string_copy(host->name);
4236 thost->address = string_copy(host->address);
4241 if (!host_is_expired && ++unexpired_hosts_tried >= ob->hosts_max_try)
4245 debug_printf("hosts_max_try limit reached with this host\n");
4246 for (h = host; h; h = h->next) if (h->mx != host->mx)
4249 unexpired_hosts_tried--;
4250 DEBUG(D_transport) debug_printf("however, a higher MX host exists "
4251 "and will be tried\n");
4256 /* Attempt the delivery. */
4258 total_hosts_tried++;
4259 rc = smtp_deliver(addrlist, thost, host_af, defport, interface, tblock,
4260 &message_defer, FALSE);
4263 OK => connection made, each address contains its result;
4264 message_defer is set for message-specific defers (when all
4265 recipients are marked defer)
4266 DEFER => there was a non-message-specific delivery problem;
4267 ERROR => there was a problem setting up the arguments for a filter,
4268 or there was a problem with expanding added headers
4271 /* If the result is not OK, there was a non-message-specific problem.
4272 If the result is DEFER, we need to write to the logs saying what happened
4273 for this particular host, except in the case of authentication and TLS
4274 failures, where the log has already been written. If all hosts defer a
4275 general message is written at the end. */
4277 if (rc == DEFER && first_addr->basic_errno != ERRNO_AUTHFAIL
4278 && first_addr->basic_errno != ERRNO_TLSFAILURE)
4279 write_logs(first_addr, host);
4281 #ifndef DISABLE_EVENT
4283 deferred_event_raise(first_addr, host);
4286 /* If STARTTLS was accepted, but there was a failure in setting up the
4287 TLS session (usually a certificate screwup), and the host is not in
4288 hosts_require_tls, and tls_tempfail_tryclear is true, try again, with
4289 TLS forcibly turned off. We have to start from scratch with a new SMTP
4290 connection. That's why the retry is done from here, not from within
4291 smtp_deliver(). [Rejections of STARTTLS itself don't screw up the
4292 session, so the in-clear transmission after those errors, if permitted,
4293 happens inside smtp_deliver().] */
4297 && first_addr->basic_errno == ERRNO_TLSFAILURE
4298 && ob->tls_tempfail_tryclear
4299 && verify_check_given_host(&ob->hosts_require_tls, host) != OK
4302 log_write(0, LOG_MAIN,
4303 "%s: delivering unencrypted to H=%s [%s] (not in hosts_require_tls)",
4304 first_addr->message, host->name, host->address);
4305 first_addr = prepare_addresses(addrlist, host);
4306 rc = smtp_deliver(addrlist, thost, host_af, defport, interface, tblock,
4307 &message_defer, TRUE);
4308 if (rc == DEFER && first_addr->basic_errno != ERRNO_AUTHFAIL)
4309 write_logs(first_addr, host);
4310 # ifndef DISABLE_EVENT
4312 deferred_event_raise(first_addr, host);
4315 #endif /*SUPPORT_TLS*/
4318 /* Delivery attempt finished */
4320 rs = rc == OK ? US"OK"
4321 : rc == DEFER ? US"DEFER"
4322 : rc == ERROR ? US"ERROR"
4325 set_process_info("delivering %s: just tried %s [%s] for %s%s: result %s",
4326 message_id, host->name, host->address, addrlist->address,
4327 addrlist->next ? " (& others)" : "", rs);
4329 /* Release serialization if set up */
4331 if (serialize_key) enq_end(serialize_key);
4333 /* If the result is DEFER, or if a host retry record is known to exist, we
4334 need to add an item to the retry chain for updating the retry database
4335 at the end of delivery. We only need to add the item to the top address,
4336 of course. Also, if DEFER, we mark the IP address unusable so as to skip it
4337 for any other delivery attempts using the same address. (It is copied into
4338 the unusable tree at the outer level, so even if different address blocks
4339 contain the same address, it still won't get tried again.) */
4341 if (rc == DEFER || retry_host_key)
4343 int delete_flag = rc != DEFER ? rf_delete : 0;
4344 if (!retry_host_key)
4347 if (exp_bool(addrlist, US"transport", tblock->name, D_transport,
4348 US"retry_include_ip_address", ob->retry_include_ip_address,
4349 ob->expand_retry_include_ip_address, &incl_ip) != OK)
4350 incl_ip = TRUE; /* error; use most-specific retry record */
4352 retry_host_key = incl_ip
4353 ? string_sprintf("T:%S:%s%s", host->name, host->address, pistring)
4354 : string_sprintf("T:%S%s", host->name, pistring);
4357 /* If a delivery of another message over an existing SMTP connection
4358 yields DEFER, we do NOT set up retry data for the host. This covers the
4359 case when there are delays in routing the addresses in the second message
4360 that are so long that the server times out. This is alleviated by not
4361 routing addresses that previously had routing defers when handling an
4362 existing connection, but even so, this case may occur (e.g. if a
4363 previously happily routed address starts giving routing defers). If the
4364 host is genuinely down, another non-continued message delivery will
4365 notice it soon enough. */
4367 if (delete_flag != 0 || !continue_hostname)
4368 retry_add_item(first_addr, retry_host_key, rf_host | delete_flag);
4370 /* We may have tried an expired host, if its retry time has come; ensure
4371 the status reflects the expiry for the benefit of any other addresses. */
4375 host->status = host_is_expired
4376 ? hstatus_unusable_expired : hstatus_unusable;
4377 host->why = hwhy_deferred;
4381 /* If message_defer is set (host was OK, but every recipient got deferred
4382 because of some message-specific problem), or if that had happened
4383 previously so that a message retry key exists, add an appropriate item
4384 to the retry chain. Note that if there was a message defer but now there is
4385 a host defer, the message defer record gets deleted. That seems perfectly
4386 reasonable. Also, stop the message from being remembered as waiting
4387 for specific hosts. */
4389 if (message_defer || retry_message_key)
4391 int delete_flag = message_defer ? 0 : rf_delete;
4392 if (!retry_message_key)
4395 if (exp_bool(addrlist, US"transport", tblock->name, D_transport,
4396 US"retry_include_ip_address", ob->retry_include_ip_address,
4397 ob->expand_retry_include_ip_address, &incl_ip) != OK)
4398 incl_ip = TRUE; /* error; use most-specific retry record */
4400 retry_message_key = incl_ip
4401 ? string_sprintf("T:%S:%s%s:%s", host->name, host->address, pistring,
4403 : string_sprintf("T:%S%s:%s", host->name, pistring, message_id);
4405 retry_add_item(addrlist, retry_message_key,
4406 rf_message | rf_host | delete_flag);
4407 update_waiting = FALSE;
4410 /* Any return other than DEFER (that is, OK or ERROR) means that the
4411 addresses have got their final statuses filled in for this host. In the OK
4412 case, see if any of them are deferred. */
4415 for (addr = addrlist; addr; addr = addr->next)
4416 if (addr->transport_return == DEFER)
4418 some_deferred = TRUE;
4422 /* If no addresses deferred or the result was ERROR, return. We do this for
4423 ERROR because a failing filter set-up or add_headers expansion is likely to
4424 fail for any host we try. */
4426 if (rc == ERROR || (rc == OK && !some_deferred))
4428 DEBUG(D_transport) debug_printf("Leaving %s transport\n", tblock->name);
4429 return TRUE; /* Each address has its status */
4432 /* If the result was DEFER or some individual addresses deferred, let
4433 the loop run to try other hosts with the deferred addresses, except for the
4434 case when we were trying to deliver down an existing channel and failed.
4435 Don't try any other hosts in this case. */
4437 if (continue_hostname) break;
4439 /* If the whole delivery, or some individual addresses, were deferred and
4440 there are more hosts that could be tried, do not count this host towards
4441 the hosts_max_try limit if the age of the message is greater than the
4442 maximum retry time for this host. This means we may try try all hosts,
4443 ignoring the limit, when messages have been around for some time. This is
4444 important because if we don't try all hosts, the address will never time
4445 out. NOTE: this does not apply to hosts_max_try_hardlimit. */
4447 if ((rc == DEFER || some_deferred) && nexthost)
4450 retry_config *retry = retry_find_config(host->name, NULL, 0, 0);
4452 if (retry && retry->rules)
4454 retry_rule *last_rule;
4455 for (last_rule = retry->rules;
4457 last_rule = last_rule->next);
4458 timedout = time(NULL) - received_time > last_rule->timeout;
4460 else timedout = TRUE; /* No rule => timed out */
4464 unexpired_hosts_tried--;
4465 DEBUG(D_transport) debug_printf("temporary delivery error(s) override "
4466 "hosts_max_try (message older than host's retry time)\n");
4469 } /* End of loop for trying multiple hosts. */
4471 /* This is the end of the loop that repeats iff expired is TRUE and
4472 ob->delay_after_cutoff is FALSE. The second time round we will
4473 try those hosts that haven't been tried since the message arrived. */
4477 debug_printf("all IP addresses skipped or deferred at least one address\n");
4478 if (expired && !ob->delay_after_cutoff && cutoff_retry == 0)
4479 debug_printf("retrying IP addresses not tried since message arrived\n");
4484 /* Get here if all IP addresses are skipped or defer at least one address. In
4485 MUA wrapper mode, this will happen only for connection or other non-message-
4486 specific failures. Force the delivery status for all addresses to FAIL. */
4490 for (addr = addrlist; addr; addr = addr->next)
4491 addr->transport_return = FAIL;
4495 /* In the normal, non-wrapper case, add a standard message to each deferred
4496 address if there hasn't been an error, that is, if it hasn't actually been
4497 tried this time. The variable "expired" will be FALSE if any deliveries were
4498 actually tried, or if there was at least one host that was not expired. That
4499 is, it is TRUE only if no deliveries were tried and all hosts were expired. If
4500 a delivery has been tried, an error code will be set, and the failing of the
4501 message is handled by the retry code later.
4503 If queue_smtp is set, or this transport was called to send a subsequent message
4504 down an existing TCP/IP connection, and something caused the host not to be
4505 found, we end up here, but can detect these cases and handle them specially. */
4507 for (addr = addrlist; addr; addr = addr->next)
4509 /* If host is not NULL, it means that we stopped processing the host list
4510 because of hosts_max_try or hosts_max_try_hardlimit. In the former case, this
4511 means we need to behave as if some hosts were skipped because their retry
4512 time had not come. Specifically, this prevents the address from timing out.
4513 However, if we have hit hosts_max_try_hardlimit, we want to behave as if all
4514 hosts were tried. */
4517 if (total_hosts_tried >= ob->hosts_max_try_hardlimit)
4520 debug_printf("hosts_max_try_hardlimit reached: behave as if all "
4521 "hosts were tried\n");
4526 debug_printf("hosts_max_try limit caused some hosts to be skipped\n");
4527 setflag(addr, af_retry_skipped);
4530 if (queue_smtp) /* no deliveries attempted */
4532 addr->transport_return = DEFER;
4533 addr->basic_errno = 0;
4534 addr->message = US"SMTP delivery explicitly queued";
4537 else if ( addr->transport_return == DEFER
4538 && (addr->basic_errno == ERRNO_UNKNOWNERROR || addr->basic_errno == 0)
4542 addr->basic_errno = ERRNO_HRETRY;
4543 if (continue_hostname)
4544 addr->message = US"no host found for existing SMTP connection";
4547 setflag(addr, af_pass_message); /* This is not a security risk */
4548 addr->message = string_sprintf(
4549 "all hosts%s have been failing for a long time %s",
4550 addr->domain ? string_sprintf(" for '%s'", addr->domain) : US"",
4551 ob->delay_after_cutoff
4552 ? US"(and retry time not reached)"
4553 : US"and were last tried after this message arrived");
4555 /* If we are already using fallback hosts, or there are no fallback hosts
4556 defined, convert the result to FAIL to cause a bounce. */
4558 if (addr->host_list == addr->fallback_hosts || !addr->fallback_hosts)
4559 addr->transport_return = FAIL;
4564 if (hosts_retry == hosts_total)
4565 s = "retry time not reached for any host%s";
4566 else if (hosts_fail == hosts_total)
4567 s = "all host address lookups%s failed permanently";
4568 else if (hosts_defer == hosts_total)
4569 s = "all host address lookups%s failed temporarily";
4570 else if (hosts_serial == hosts_total)
4571 s = "connection limit reached for all hosts%s";
4572 else if (hosts_fail+hosts_defer == hosts_total)
4573 s = "all host address lookups%s failed";
4575 s = "some host address lookups failed and retry time "
4576 "not reached for other hosts or connection limit reached%s";
4578 addr->message = string_sprintf(s,
4579 addr->domain ? string_sprintf(" for '%s'", addr->domain) : US"");
4584 /* Update the database which keeps information about which messages are waiting
4585 for which hosts to become available. For some message-specific errors, the
4586 update_waiting flag is turned off because we don't want follow-on deliveries in
4587 those cases. If this transport instance is explicitly limited to one message
4588 per connection then follow-on deliveries are not possible and there's no need
4589 to create/update the per-transport wait-<transport_name> database. */
4591 if (update_waiting && tblock->connection_max_messages != 1)
4592 transport_update_waiting(hostlist, tblock->name);
4596 DEBUG(D_transport) debug_printf("Leaving %s transport\n", tblock->name);
4598 return TRUE; /* Each address has its status */
4603 /* End of transport/smtp.c */