1 /*************************************************
2 * Exim - an Internet mail transport agent *
3 *************************************************/
5 /* Copyright (c) University of Cambridge 1995 - 2016 */
6 /* See the file NOTICE for conditions of use and distribution. */
12 #define PENDING_DEFER (PENDING + DEFER)
13 #define PENDING_OK (PENDING + OK)
16 /* Options specific to the smtp transport. This transport also supports LMTP
17 over TCP/IP. The options must be in alphabetic order (note that "_" comes
18 before the lower case letters). Some live in the transport_instance block so as
19 to be publicly visible; these are flagged with opt_public. */
21 optionlist smtp_transport_options[] = {
22 { "*expand_multi_domain", opt_stringptr | opt_hidden | opt_public,
23 (void *)offsetof(transport_instance, expand_multi_domain) },
24 { "*expand_retry_include_ip_address", opt_stringptr | opt_hidden,
25 (void *)(offsetof(smtp_transport_options_block, expand_retry_include_ip_address)) },
27 { "address_retry_include_sender", opt_bool,
28 (void *)offsetof(smtp_transport_options_block, address_retry_include_sender) },
29 { "allow_localhost", opt_bool,
30 (void *)offsetof(smtp_transport_options_block, allow_localhost) },
31 { "authenticated_sender", opt_stringptr,
32 (void *)offsetof(smtp_transport_options_block, authenticated_sender) },
33 { "authenticated_sender_force", opt_bool,
34 (void *)offsetof(smtp_transport_options_block, authenticated_sender_force) },
35 { "command_timeout", opt_time,
36 (void *)offsetof(smtp_transport_options_block, command_timeout) },
37 { "connect_timeout", opt_time,
38 (void *)offsetof(smtp_transport_options_block, connect_timeout) },
39 { "connection_max_messages", opt_int | opt_public,
40 (void *)offsetof(transport_instance, connection_max_messages) },
41 { "data_timeout", opt_time,
42 (void *)offsetof(smtp_transport_options_block, data_timeout) },
43 { "delay_after_cutoff", opt_bool,
44 (void *)offsetof(smtp_transport_options_block, delay_after_cutoff) },
46 { "dkim_canon", opt_stringptr,
47 (void *)offsetof(smtp_transport_options_block, dkim.dkim_canon) },
48 { "dkim_domain", opt_stringptr,
49 (void *)offsetof(smtp_transport_options_block, dkim.dkim_domain) },
50 { "dkim_private_key", opt_stringptr,
51 (void *)offsetof(smtp_transport_options_block, dkim.dkim_private_key) },
52 { "dkim_selector", opt_stringptr,
53 (void *)offsetof(smtp_transport_options_block, dkim.dkim_selector) },
54 { "dkim_sign_headers", opt_stringptr,
55 (void *)offsetof(smtp_transport_options_block, dkim.dkim_sign_headers) },
56 { "dkim_strict", opt_stringptr,
57 (void *)offsetof(smtp_transport_options_block, dkim.dkim_strict) },
59 { "dns_qualify_single", opt_bool,
60 (void *)offsetof(smtp_transport_options_block, dns_qualify_single) },
61 { "dns_search_parents", opt_bool,
62 (void *)offsetof(smtp_transport_options_block, dns_search_parents) },
63 { "dnssec_request_domains", opt_stringptr,
64 (void *)offsetof(smtp_transport_options_block, dnssec.request) },
65 { "dnssec_require_domains", opt_stringptr,
66 (void *)offsetof(smtp_transport_options_block, dnssec.require) },
67 { "dscp", opt_stringptr,
68 (void *)offsetof(smtp_transport_options_block, dscp) },
69 { "fallback_hosts", opt_stringptr,
70 (void *)offsetof(smtp_transport_options_block, fallback_hosts) },
71 { "final_timeout", opt_time,
72 (void *)offsetof(smtp_transport_options_block, final_timeout) },
73 { "gethostbyname", opt_bool,
74 (void *)offsetof(smtp_transport_options_block, gethostbyname) },
75 { "helo_data", opt_stringptr,
76 (void *)offsetof(smtp_transport_options_block, helo_data) },
77 { "hosts", opt_stringptr,
78 (void *)offsetof(smtp_transport_options_block, hosts) },
79 { "hosts_avoid_esmtp", opt_stringptr,
80 (void *)offsetof(smtp_transport_options_block, hosts_avoid_esmtp) },
81 { "hosts_avoid_pipelining", opt_stringptr,
82 (void *)offsetof(smtp_transport_options_block, hosts_avoid_pipelining) },
84 { "hosts_avoid_tls", opt_stringptr,
85 (void *)offsetof(smtp_transport_options_block, hosts_avoid_tls) },
87 { "hosts_max_try", opt_int,
88 (void *)offsetof(smtp_transport_options_block, hosts_max_try) },
89 { "hosts_max_try_hardlimit", opt_int,
90 (void *)offsetof(smtp_transport_options_block, hosts_max_try_hardlimit) },
92 { "hosts_nopass_tls", opt_stringptr,
93 (void *)offsetof(smtp_transport_options_block, hosts_nopass_tls) },
95 { "hosts_override", opt_bool,
96 (void *)offsetof(smtp_transport_options_block, hosts_override) },
97 { "hosts_randomize", opt_bool,
98 (void *)offsetof(smtp_transport_options_block, hosts_randomize) },
99 #if defined(SUPPORT_TLS) && !defined(DISABLE_OCSP)
100 { "hosts_request_ocsp", opt_stringptr,
101 (void *)offsetof(smtp_transport_options_block, hosts_request_ocsp) },
103 { "hosts_require_auth", opt_stringptr,
104 (void *)offsetof(smtp_transport_options_block, hosts_require_auth) },
106 # ifdef EXPERIMENTAL_DANE
107 { "hosts_require_dane", opt_stringptr,
108 (void *)offsetof(smtp_transport_options_block, hosts_require_dane) },
110 # ifndef DISABLE_OCSP
111 { "hosts_require_ocsp", opt_stringptr,
112 (void *)offsetof(smtp_transport_options_block, hosts_require_ocsp) },
114 { "hosts_require_tls", opt_stringptr,
115 (void *)offsetof(smtp_transport_options_block, hosts_require_tls) },
117 { "hosts_try_auth", opt_stringptr,
118 (void *)offsetof(smtp_transport_options_block, hosts_try_auth) },
119 #if defined(SUPPORT_TLS) && defined(EXPERIMENTAL_DANE)
120 { "hosts_try_dane", opt_stringptr,
121 (void *)offsetof(smtp_transport_options_block, hosts_try_dane) },
124 { "hosts_try_prdr", opt_stringptr,
125 (void *)offsetof(smtp_transport_options_block, hosts_try_prdr) },
128 { "hosts_verify_avoid_tls", opt_stringptr,
129 (void *)offsetof(smtp_transport_options_block, hosts_verify_avoid_tls) },
131 { "interface", opt_stringptr,
132 (void *)offsetof(smtp_transport_options_block, interface) },
133 { "keepalive", opt_bool,
134 (void *)offsetof(smtp_transport_options_block, keepalive) },
135 { "lmtp_ignore_quota", opt_bool,
136 (void *)offsetof(smtp_transport_options_block, lmtp_ignore_quota) },
137 { "max_rcpt", opt_int | opt_public,
138 (void *)offsetof(transport_instance, max_addresses) },
139 { "multi_domain", opt_expand_bool | opt_public,
140 (void *)offsetof(transport_instance, multi_domain) },
141 { "port", opt_stringptr,
142 (void *)offsetof(smtp_transport_options_block, port) },
143 { "protocol", opt_stringptr,
144 (void *)offsetof(smtp_transport_options_block, protocol) },
145 { "retry_include_ip_address", opt_expand_bool,
146 (void *)offsetof(smtp_transport_options_block, retry_include_ip_address) },
147 { "serialize_hosts", opt_stringptr,
148 (void *)offsetof(smtp_transport_options_block, serialize_hosts) },
149 { "size_addition", opt_int,
150 (void *)offsetof(smtp_transport_options_block, size_addition) }
152 ,{ "socks_proxy", opt_stringptr,
153 (void *)offsetof(smtp_transport_options_block, socks_proxy) }
156 ,{ "tls_certificate", opt_stringptr,
157 (void *)offsetof(smtp_transport_options_block, tls_certificate) },
158 { "tls_crl", opt_stringptr,
159 (void *)offsetof(smtp_transport_options_block, tls_crl) },
160 { "tls_dh_min_bits", opt_int,
161 (void *)offsetof(smtp_transport_options_block, tls_dh_min_bits) },
162 { "tls_privatekey", opt_stringptr,
163 (void *)offsetof(smtp_transport_options_block, tls_privatekey) },
164 { "tls_require_ciphers", opt_stringptr,
165 (void *)offsetof(smtp_transport_options_block, tls_require_ciphers) },
166 { "tls_sni", opt_stringptr,
167 (void *)offsetof(smtp_transport_options_block, tls_sni) },
168 { "tls_tempfail_tryclear", opt_bool,
169 (void *)offsetof(smtp_transport_options_block, tls_tempfail_tryclear) },
170 { "tls_try_verify_hosts", opt_stringptr,
171 (void *)offsetof(smtp_transport_options_block, tls_try_verify_hosts) },
172 { "tls_verify_cert_hostnames", opt_stringptr,
173 (void *)offsetof(smtp_transport_options_block,tls_verify_cert_hostnames)},
174 { "tls_verify_certificates", opt_stringptr,
175 (void *)offsetof(smtp_transport_options_block, tls_verify_certificates) },
176 { "tls_verify_hosts", opt_stringptr,
177 (void *)offsetof(smtp_transport_options_block, tls_verify_hosts) }
181 /* Size of the options list. An extern variable has to be used so that its
182 address can appear in the tables drtables.c. */
184 int smtp_transport_options_count =
185 sizeof(smtp_transport_options)/sizeof(optionlist);
187 /* Default private options block for the smtp transport. */
189 smtp_transport_options_block smtp_transport_option_defaults = {
191 NULL, /* fallback_hosts */
193 NULL, /* fallback_hostlist */
194 NULL, /* authenticated_sender */
195 US"$primary_hostname", /* helo_data */
196 NULL, /* interface */
198 US"smtp", /* protocol */
200 NULL, /* serialize_hosts */
201 NULL, /* hosts_try_auth */
202 NULL, /* hosts_require_auth */
203 #ifdef EXPERIMENTAL_DANE
204 NULL, /* hosts_try_dane */
205 NULL, /* hosts_require_dane */
208 US"*", /* hosts_try_prdr */
211 US"*", /* hosts_request_ocsp (except under DANE; tls_client_start()) */
212 NULL, /* hosts_require_ocsp */
214 NULL, /* hosts_require_tls */
215 NULL, /* hosts_avoid_tls */
216 NULL, /* hosts_verify_avoid_tls */
217 NULL, /* hosts_avoid_pipelining */
218 NULL, /* hosts_avoid_esmtp */
219 NULL, /* hosts_nopass_tls */
220 5*60, /* command_timeout */
221 5*60, /* connect_timeout; shorter system default overrides */
222 5*60, /* data timeout */
223 10*60, /* final timeout */
224 1024, /* size_addition */
225 5, /* hosts_max_try */
226 50, /* hosts_max_try_hardlimit */
227 TRUE, /* address_retry_include_sender */
228 FALSE, /* allow_localhost */
229 FALSE, /* authenticated_sender_force */
230 FALSE, /* gethostbyname */
231 TRUE, /* dns_qualify_single */
232 FALSE, /* dns_search_parents */
233 { NULL, NULL }, /* dnssec_domains {request,require} */
234 TRUE, /* delay_after_cutoff */
235 FALSE, /* hosts_override */
236 FALSE, /* hosts_randomize */
237 TRUE, /* keepalive */
238 FALSE, /* lmtp_ignore_quota */
239 NULL, /* expand_retry_include_ip_address */
240 TRUE /* retry_include_ip_address */
242 ,NULL /* socks_proxy */
245 ,NULL, /* tls_certificate */
247 NULL, /* tls_privatekey */
248 NULL, /* tls_require_ciphers */
250 US"system", /* tls_verify_certificates */
251 EXIM_CLIENT_DH_DEFAULT_MIN_BITS,
252 /* tls_dh_min_bits */
253 TRUE, /* tls_tempfail_tryclear */
254 NULL, /* tls_verify_hosts */
255 US"*", /* tls_try_verify_hosts */
256 US"*" /* tls_verify_cert_hostnames */
259 , {NULL, /* dkim_canon */
260 NULL, /* dkim_domain */
261 NULL, /* dkim_private_key */
262 NULL, /* dkim_selector */
263 NULL, /* dkim_sign_headers */
264 NULL} /* dkim_strict */
268 /* some DSN flags for use later */
270 static int rf_list[] = {rf_notify_never, rf_notify_success,
271 rf_notify_failure, rf_notify_delay };
273 static uschar *rf_names[] = { US"NEVER", US"SUCCESS", US"FAILURE", US"DELAY" };
279 static uschar *smtp_command; /* Points to last cmd for error messages */
280 static uschar *mail_command; /* Points to MAIL cmd for error messages */
281 static BOOL update_waiting; /* TRUE to update the "wait" database */
282 static BOOL pipelining_active; /* current transaction is in pipe mode */
285 /*************************************************
286 * Setup entry point *
287 *************************************************/
289 /* This function is called when the transport is about to be used,
290 but before running it in a sub-process. It is used for two things:
292 (1) To set the fallback host list in addresses, when delivering.
293 (2) To pass back the interface, port, protocol, and other options, for use
294 during callout verification.
297 tblock pointer to the transport instance block
298 addrlist list of addresses about to be transported
299 tf if not NULL, pointer to block in which to return options
300 uid the uid that will be set (not used)
301 gid the gid that will be set (not used)
302 errmsg place for error message (not used)
304 Returns: OK always (FAIL, DEFER not used)
308 smtp_transport_setup(transport_instance *tblock, address_item *addrlist,
309 transport_feedback *tf, uid_t uid, gid_t gid, uschar **errmsg)
311 smtp_transport_options_block *ob =
312 (smtp_transport_options_block *)(tblock->options_block);
314 errmsg = errmsg; /* Keep picky compilers happy */
318 /* Pass back options if required. This interface is getting very messy. */
322 tf->interface = ob->interface;
324 tf->protocol = ob->protocol;
325 tf->hosts = ob->hosts;
326 tf->hosts_override = ob->hosts_override;
327 tf->hosts_randomize = ob->hosts_randomize;
328 tf->gethostbyname = ob->gethostbyname;
329 tf->qualify_single = ob->dns_qualify_single;
330 tf->search_parents = ob->dns_search_parents;
331 tf->helo_data = ob->helo_data;
334 /* Set the fallback host list for all the addresses that don't have fallback
335 host lists, provided that the local host wasn't present in the original host
338 if (!testflag(addrlist, af_local_host_removed))
340 for (; addrlist != NULL; addrlist = addrlist->next)
341 if (addrlist->fallback_hosts == NULL)
342 addrlist->fallback_hosts = ob->fallback_hostlist;
350 /*************************************************
351 * Initialization entry point *
352 *************************************************/
354 /* Called for each instance, after its options have been read, to
355 enable consistency checks to be done, or anything else that needs
358 Argument: pointer to the transport instance block
363 smtp_transport_init(transport_instance *tblock)
365 smtp_transport_options_block *ob =
366 (smtp_transport_options_block *)(tblock->options_block);
368 /* Retry_use_local_part defaults FALSE if unset */
370 if (tblock->retry_use_local_part == TRUE_UNSET)
371 tblock->retry_use_local_part = FALSE;
373 /* Set the default port according to the protocol */
375 if (ob->port == NULL)
376 ob->port = (strcmpic(ob->protocol, US"lmtp") == 0)? US"lmtp" :
377 (strcmpic(ob->protocol, US"smtps") == 0)? US"smtps" : US"smtp";
379 /* Set up the setup entry point, to be called before subprocesses for this
382 tblock->setup = smtp_transport_setup;
384 /* Complain if any of the timeouts are zero. */
386 if (ob->command_timeout <= 0 || ob->data_timeout <= 0 ||
387 ob->final_timeout <= 0)
388 log_write(0, LOG_PANIC_DIE|LOG_CONFIG,
389 "command, data, or final timeout value is zero for %s transport",
392 /* If hosts_override is set and there are local hosts, set the global
393 flag that stops verify from showing router hosts. */
395 if (ob->hosts_override && ob->hosts != NULL) tblock->overrides_hosts = TRUE;
397 /* If there are any fallback hosts listed, build a chain of host items
398 for them, but do not do any lookups at this time. */
400 host_build_hostlist(&(ob->fallback_hostlist), ob->fallback_hosts, FALSE);
407 /*************************************************
408 * Set delivery info into all active addresses *
409 *************************************************/
411 /* Only addresses whose status is >= PENDING are relevant. A lesser
412 status means that an address is not currently being processed.
415 addrlist points to a chain of addresses
416 errno_value to put in each address's errno field
417 msg to put in each address's message field
418 rc to put in each address's transport_return field
419 pass_message if TRUE, set the "pass message" flag in the address
420 host if set, mark addrs as having used this host
421 smtp_greeting from peer
422 helo_response from peer
424 If errno_value has the special value ERRNO_CONNECTTIMEOUT, ETIMEDOUT is put in
425 the errno field, and RTEF_CTOUT is ORed into the more_errno field, to indicate
426 this particular type of timeout.
432 set_errno(address_item *addrlist, int errno_value, uschar *msg, int rc,
433 BOOL pass_message, host_item * host
434 #ifdef EXPERIMENTAL_DSN_INFO
435 , const uschar * smtp_greeting, const uschar * helo_response
441 if (errno_value == ERRNO_CONNECTTIMEOUT)
443 errno_value = ETIMEDOUT;
444 orvalue = RTEF_CTOUT;
446 for (addr = addrlist; addr; addr = addr->next)
447 if (addr->transport_return >= PENDING)
449 addr->basic_errno = errno_value;
450 addr->more_errno |= orvalue;
454 if (pass_message) setflag(addr, af_pass_message);
456 addr->transport_return = rc;
459 addr->host_used = host;
460 #ifdef EXPERIMENTAL_DSN_INFO
462 {uschar * s = Ustrchr(smtp_greeting, '\n'); if (s) *s = '\0';}
463 addr->smtp_greeting = smtp_greeting;
466 {uschar * s = Ustrchr(helo_response, '\n'); if (s) *s = '\0';}
467 addr->helo_response = helo_response;
474 set_errno_nohost(address_item *addrlist, int errno_value, uschar *msg, int rc,
477 set_errno(addrlist, errno_value, msg, rc, pass_message, NULL
478 #ifdef EXPERIMENTAL_DSN_INFO
485 /*************************************************
486 * Check an SMTP response *
487 *************************************************/
489 /* This function is given an errno code and the SMTP response buffer
490 to analyse, together with the host identification for generating messages. It
491 sets an appropriate message and puts the first digit of the response code into
492 the yield variable. If no response was actually read, a suitable digit is
496 host the current host, to get its name for messages
497 errno_value pointer to the errno value
498 more_errno from the top address for use with ERRNO_FILTER_FAIL
499 buffer the SMTP response buffer
500 yield where to put a one-digit SMTP response code
501 message where to put an errror message
502 pass_message set TRUE if message is an SMTP response
504 Returns: TRUE if an SMTP "QUIT" command should be sent, else FALSE
508 check_response(host_item *host, int *errno_value, int more_errno,
509 uschar *buffer, int *yield, uschar **message, BOOL *pass_message)
511 uschar * pl = pipelining_active ? US"pipelined " : US"";
513 *yield = '4'; /* Default setting is to give a temporary error */
515 /* Handle response timeout */
517 if (*errno_value == ETIMEDOUT)
519 *message = US string_sprintf("SMTP timeout after %s%s",
521 if (transport_count > 0)
522 *message = US string_sprintf("%s (%d bytes written)", *message,
527 /* Handle malformed SMTP response */
529 if (*errno_value == ERRNO_SMTPFORMAT)
531 const uschar *malfresp = string_printing(buffer);
532 while (isspace(*malfresp)) malfresp++;
533 *message = *malfresp == 0
534 ? string_sprintf("Malformed SMTP reply (an empty line) "
535 "in response to %s%s", pl, smtp_command)
536 : string_sprintf("Malformed SMTP reply in response to %s%s: %s",
537 pl, smtp_command, malfresp);
541 /* Handle a failed filter process error; can't send QUIT as we mustn't
544 if (*errno_value == ERRNO_FILTER_FAIL)
546 *message = US string_sprintf("transport filter process failed (%d)%s",
548 (more_errno == EX_EXECFAILED)? ": unable to execute command" : "");
552 /* Handle a failed add_headers expansion; can't send QUIT as we mustn't
555 if (*errno_value == ERRNO_CHHEADER_FAIL)
558 US string_sprintf("failed to expand headers_add or headers_remove: %s",
559 expand_string_message);
563 /* Handle failure to write a complete data block */
565 if (*errno_value == ERRNO_WRITEINCOMPLETE)
567 *message = US string_sprintf("failed to write a data block");
572 /* Handle lack of advertised SMTPUTF8, for international message */
573 if (*errno_value == ERRNO_UTF8_FWD)
575 *message = US string_sprintf("utf8 support required but not offered for forwarding");
576 DEBUG(D_deliver|D_transport) debug_printf("%s\n", *message);
581 /* Handle error responses from the remote mailer. */
585 const uschar *s = string_printing(buffer);
586 *message = US string_sprintf("SMTP error from remote mail server after %s%s: "
587 "%s", pl, smtp_command, s);
588 *pass_message = TRUE;
593 /* No data was read. If there is no errno, this must be the EOF (i.e.
594 connection closed) case, which causes deferral. An explicit connection reset
595 error has the same effect. Otherwise, put the host's identity in the message,
596 leaving the errno value to be interpreted as well. In all cases, we have to
597 assume the connection is now dead. */
599 if (*errno_value == 0 || *errno_value == ECONNRESET)
601 *errno_value = ERRNO_SMTPCLOSED;
602 *message = US string_sprintf("Remote host closed connection "
603 "in response to %s%s", pl, smtp_command);
605 else *message = US string_sprintf("%s [%s]", host->name, host->address);
612 /*************************************************
613 * Write error message to logs *
614 *************************************************/
616 /* This writes to the main log and to the message log.
619 addr the address item containing error information
620 host the current host
626 write_logs(address_item *addr, host_item *host)
628 uschar * message = string_sprintf("H=%s [%s]", host->name, host->address);
630 if (LOGGING(outgoing_port))
631 message = string_sprintf("%s:%d", message,
632 host->port == PORT_NONE ? 25 : host->port);
635 message = string_sprintf("%s: %s", message, addr->message);
636 if (addr->basic_errno > 0)
637 message = string_sprintf("%s: %s", message, strerror(addr->basic_errno));
638 log_write(0, LOG_MAIN, "%s", message);
639 deliver_msglog("%s %s\n", tod_stamp(tod_log), message);
643 const uschar * s = exim_errstr(addr->basic_errno);
644 log_write(0, LOG_MAIN, "%s %s", message, s);
645 deliver_msglog("%s %s %s\n", tod_stamp(tod_log), message, s);
650 msglog_line(host_item * host, uschar * message)
652 deliver_msglog("%s H=%s [%s] %s\n", tod_stamp(tod_log),
653 host->name, host->address, message);
658 #ifndef DISABLE_EVENT
659 /*************************************************
660 * Post-defer action *
661 *************************************************/
663 /* This expands an arbitrary per-transport string.
664 It might, for example, be used to write to the database log.
667 addr the address item containing error information
668 host the current host
674 deferred_event_raise(address_item *addr, host_item *host)
676 uschar * action = addr->transport->event_action;
677 const uschar * save_domain;
683 save_domain = deliver_domain;
684 save_local = deliver_localpart;
686 /*XXX would ip & port already be set up? */
687 deliver_host_address = string_copy(host->address);
688 deliver_host_port = host->port == PORT_NONE ? 25 : host->port;
689 event_defer_errno = addr->basic_errno;
691 router_name = addr->router->name;
692 transport_name = addr->transport->name;
693 deliver_domain = addr->domain;
694 deliver_localpart = addr->local_part;
696 (void) event_raise(action, US"msg:host:defer",
698 ? addr->basic_errno > 0
699 ? string_sprintf("%s: %s", addr->message, strerror(addr->basic_errno))
700 : string_copy(addr->message)
701 : addr->basic_errno > 0
702 ? string_copy(US strerror(addr->basic_errno))
705 deliver_localpart = save_local;
706 deliver_domain = save_domain;
707 router_name = transport_name = NULL;
711 /*************************************************
712 * Synchronize SMTP responses *
713 *************************************************/
715 /* This function is called from smtp_deliver() to receive SMTP responses from
716 the server, and match them up with the commands to which they relate. When
717 PIPELINING is not in use, this function is called after every command, and is
718 therefore somewhat over-engineered, but it is simpler to use a single scheme
719 that works both with and without PIPELINING instead of having two separate sets
722 The set of commands that are buffered up with pipelining may start with MAIL
723 and may end with DATA; in between are RCPT commands that correspond to the
724 addresses whose status is PENDING_DEFER. All other commands (STARTTLS, AUTH,
725 etc.) are never buffered.
727 Errors after MAIL or DATA abort the whole process leaving the response in the
728 buffer. After MAIL, pending responses are flushed, and the original command is
729 re-instated in big_buffer for error messages. For RCPT commands, the remote is
730 permitted to reject some recipient addresses while accepting others. However
731 certain errors clearly abort the whole process. Set the value in
732 transport_return to PENDING_OK if the address is accepted. If there is a
733 subsequent general error, it will get reset accordingly. If not, it will get
734 converted to OK at the end.
737 addrlist the complete address list
738 include_affixes TRUE if affixes include in RCPT
739 sync_addr ptr to the ptr of the one to start scanning at (updated)
740 host the host we are connected to
741 count the number of responses to read
743 include_sender true if 4xx retry is to include the sender it its key
744 pending_MAIL true if the first response is for MAIL
745 pending_DATA 0 if last command sent was not DATA
746 +1 if previously had a good recipient
747 -1 if not previously had a good recipient
748 inblock incoming SMTP block
749 timeout timeout value
750 buffer buffer for reading response
751 buffsize size of buffer
753 Returns: 3 if at least one address had 2xx and one had 5xx
754 2 if at least one address had 5xx but none had 2xx
755 1 if at least one host had a 2xx response, but none had 5xx
756 0 no address had 2xx or 5xx but no errors (all 4xx, or just DATA)
757 -1 timeout while reading RCPT response
758 -2 I/O or other non-response error for RCPT
759 -3 DATA or MAIL failed - errno and buffer set
763 sync_responses(address_item *addrlist, BOOL include_affixes,
764 address_item **sync_addr, host_item *host, int count,
765 BOOL address_retry_include_sender, BOOL pending_MAIL,
766 int pending_DATA, smtp_inblock *inblock, int timeout, uschar *buffer,
769 address_item *addr = *sync_addr;
772 /* Handle the response for a MAIL command. On error, reinstate the original
773 command in big_buffer for error message use, and flush any further pending
774 responses before returning, except after I/O errors and timeouts. */
779 if (!smtp_read_response(inblock, buffer, buffsize, '2', timeout))
781 Ustrcpy(big_buffer, mail_command); /* Fits, because it came from there! */
782 if (errno == 0 && buffer[0] != 0)
784 uschar flushbuffer[4096];
786 if (buffer[0] == '4')
788 save_errno = ERRNO_MAIL4XX;
789 addr->more_errno |= ((buffer[1] - '0')*10 + buffer[2] - '0') << 8;
793 if (!smtp_read_response(inblock, flushbuffer, sizeof(flushbuffer),
795 && (errno != 0 || flushbuffer[0] == 0))
801 if (pending_DATA) count--; /* Number of RCPT responses to come */
802 while (count-- > 0) /* Mark any pending addrs with the host used */
804 while (addr->transport_return != PENDING_DEFER) addr = addr->next;
805 addr->host_used = host;
812 if (pending_DATA) count--; /* Number of RCPT responses to come */
814 /* Read and handle the required number of RCPT responses, matching each one up
815 with an address by scanning for the next address whose status is PENDING_DEFER.
820 while (addr->transport_return != PENDING_DEFER) addr = addr->next;
822 /* The address was accepted */
823 addr->host_used = host;
825 if (smtp_read_response(inblock, buffer, buffsize, '2', timeout))
828 addr->transport_return = PENDING_OK;
830 /* If af_dr_retry_exists is set, there was a routing delay on this address;
831 ensure that any address-specific retry record is expunged. We do this both
832 for the basic key and for the version that also includes the sender. */
834 if (testflag(addr, af_dr_retry_exists))
836 uschar *altkey = string_sprintf("%s:<%s>", addr->address_retry_key,
838 retry_add_item(addr, altkey, rf_delete);
839 retry_add_item(addr, addr->address_retry_key, rf_delete);
843 /* Timeout while reading the response */
845 else if (errno == ETIMEDOUT)
847 uschar *message = string_sprintf("SMTP timeout after RCPT TO:<%s>",
848 transport_rcpt_address(addr, include_affixes));
849 set_errno_nohost(addrlist, ETIMEDOUT, message, DEFER, FALSE);
850 retry_add_item(addr, addr->address_retry_key, 0);
851 update_waiting = FALSE;
855 /* Handle other errors in obtaining an SMTP response by returning -1. This
856 will cause all the addresses to be deferred. Restore the SMTP command in
857 big_buffer for which we are checking the response, so the error message
860 else if (errno != 0 || buffer[0] == 0)
862 string_format(big_buffer, big_buffer_size, "RCPT TO:<%s>",
863 transport_rcpt_address(addr, include_affixes));
867 /* Handle SMTP permanent and temporary response codes. */
872 string_sprintf("SMTP error from remote mail server after RCPT TO:<%s>: "
873 "%s", transport_rcpt_address(addr, include_affixes),
874 string_printing(buffer));
875 setflag(addr, af_pass_message);
876 msglog_line(host, addr->message);
878 /* The response was 5xx */
880 if (buffer[0] == '5')
882 addr->transport_return = FAIL;
886 /* The response was 4xx */
890 addr->transport_return = DEFER;
891 addr->basic_errno = ERRNO_RCPT4XX;
892 addr->more_errno |= ((buffer[1] - '0')*10 + buffer[2] - '0') << 8;
894 #ifndef DISABLE_EVENT
895 event_defer_errno = addr->more_errno;
896 msg_event_raise(US"msg:rcpt:host:defer", addr);
899 /* Log temporary errors if there are more hosts to be tried.
900 If not, log this last one in the == line. */
903 log_write(0, LOG_MAIN, "H=%s [%s]: %s", host->name, host->address, addr->message);
905 #ifndef DISABLE_EVENT
907 msg_event_raise(US"msg:rcpt:defer", addr);
910 /* Do not put this message on the list of those waiting for specific
911 hosts, as otherwise it is likely to be tried too often. */
913 update_waiting = FALSE;
915 /* Add a retry item for the address so that it doesn't get tried again
916 too soon. If address_retry_include_sender is true, add the sender address
919 if (address_retry_include_sender)
921 uschar *altkey = string_sprintf("%s:<%s>", addr->address_retry_key,
923 retry_add_item(addr, altkey, 0);
925 else retry_add_item(addr, addr->address_retry_key, 0);
928 } /* Loop for next RCPT response */
930 /* Update where to start at for the next block of responses, unless we
931 have already handled all the addresses. */
933 if (addr != NULL) *sync_addr = addr->next;
935 /* Handle a response to DATA. If we have not had any good recipients, either
936 previously or in this block, the response is ignored. */
938 if (pending_DATA != 0 &&
939 !smtp_read_response(inblock, buffer, buffsize, '3', timeout))
944 if (pending_DATA > 0 || (yield & 1) != 0)
946 if (errno == 0 && buffer[0] == '4')
948 errno = ERRNO_DATA4XX;
949 addrlist->more_errno |= ((buffer[1] - '0')*10 + buffer[2] - '0') << 8;
953 (void)check_response(host, &errno, 0, buffer, &code, &msg, &pass_message);
954 DEBUG(D_transport) debug_printf("%s\nerror for DATA ignored: pipelining "
955 "is in use and there were no good recipients\n", msg);
958 /* All responses read and handled; MAIL (if present) received 2xx and DATA (if
959 present) received 3xx. If any RCPTs were handled and yielded anything other
960 than 4xx, yield will be set non-zero. */
967 /* Do the client side of smtp-level authentication */
970 buffer EHLO response from server (gets overwritten)
971 addrlist chain of potential addresses to deliver
972 host host to deliver to
974 ibp, obp comms channel control blocks
977 OK Success, or failed (but not required): global "smtp_authenticated" set
978 DEFER Failed authentication (and was required)
979 ERROR Internal problem
981 FAIL_SEND Failed communications - transmit
986 smtp_auth(uschar *buffer, unsigned bufsize, address_item *addrlist, host_item *host,
987 smtp_transport_options_block *ob, BOOL is_esmtp,
988 smtp_inblock *ibp, smtp_outblock *obp)
991 uschar *fail_reason = US"server did not advertise AUTH support";
993 smtp_authenticated = FALSE;
994 client_authenticator = client_authenticated_id = client_authenticated_sender = NULL;
995 require_auth = verify_check_given_host(&ob->hosts_require_auth, host);
997 if (is_esmtp && !regex_AUTH) regex_AUTH =
998 regex_must_compile(US"\\n250[\\s\\-]AUTH\\s+([\\-\\w\\s]+)(?:\\n|$)",
1001 if (is_esmtp && regex_match_and_setup(regex_AUTH, buffer, 0, -1))
1003 uschar *names = string_copyn(expand_nstring[1], expand_nlength[1]);
1004 expand_nmax = -1; /* reset */
1006 /* Must not do this check until after we have saved the result of the
1007 regex match above. */
1009 if (require_auth == OK ||
1010 verify_check_given_host(&ob->hosts_try_auth, host) == OK)
1013 fail_reason = US"no common mechanisms were found";
1015 DEBUG(D_transport) debug_printf("scanning authentication mechanisms\n");
1017 /* Scan the configured authenticators looking for one which is configured
1018 for use as a client, which is not suppressed by client_condition, and
1019 whose name matches an authentication mechanism supported by the server.
1020 If one is found, attempt to authenticate by calling its client function.
1023 for (au = auths; !smtp_authenticated && au != NULL; au = au->next)
1027 (au->client_condition != NULL &&
1028 !expand_check_condition(au->client_condition, au->name,
1029 US"client authenticator")))
1031 DEBUG(D_transport) debug_printf("skipping %s authenticator: %s\n",
1033 (au->client)? "client_condition is false" :
1034 "not configured as a client");
1038 /* Loop to scan supported server mechanisms */
1043 int len = Ustrlen(au->public_name);
1044 while (isspace(*p)) p++;
1046 if (strncmpic(au->public_name, p, len) != 0 ||
1047 (p[len] != 0 && !isspace(p[len])))
1049 while (*p != 0 && !isspace(*p)) p++;
1053 /* Found data for a listed mechanism. Call its client entry. Set
1054 a flag in the outblock so that data is overwritten after sending so
1055 that reflections don't show it. */
1057 fail_reason = US"authentication attempt(s) failed";
1058 obp->authenticating = TRUE;
1059 rc = (au->info->clientcode)(au, ibp, obp,
1060 ob->command_timeout, buffer, bufsize);
1061 obp->authenticating = FALSE;
1062 DEBUG(D_transport) debug_printf("%s authenticator yielded %d\n",
1065 /* A temporary authentication failure must hold up delivery to
1066 this host. After a permanent authentication failure, we carry on
1067 to try other authentication methods. If all fail hard, try to
1068 deliver the message unauthenticated unless require_auth was set. */
1073 smtp_authenticated = TRUE; /* stops the outer loop */
1074 client_authenticator = au->name;
1075 if (au->set_client_id != NULL)
1076 client_authenticated_id = expand_string(au->set_client_id);
1079 /* Failure after writing a command */
1084 /* Failure after reading a response */
1087 if (errno != 0 || buffer[0] != '5') return FAIL;
1088 log_write(0, LOG_MAIN, "%s authenticator failed H=%s [%s] %s",
1089 au->name, host->name, host->address, buffer);
1092 /* Failure by some other means. In effect, the authenticator
1093 decided it wasn't prepared to handle this case. Typically this
1094 is the result of "fail" in an expansion string. Do we need to
1095 log anything here? Feb 2006: a message is now put in the buffer
1096 if logging is required. */
1100 log_write(0, LOG_MAIN, "%s authenticator cancelled "
1101 "authentication H=%s [%s] %s", au->name, host->name,
1102 host->address, buffer);
1105 /* Internal problem, message in buffer. */
1108 set_errno_nohost(addrlist, ERRNO_AUTHPROB, string_copy(buffer),
1113 break; /* If not authenticated, try next authenticator */
1114 } /* Loop for scanning supported server mechanisms */
1115 } /* Loop for further authenticators */
1119 /* If we haven't authenticated, but are required to, give up. */
1121 if (require_auth == OK && !smtp_authenticated)
1123 set_errno_nohost(addrlist, ERRNO_AUTHFAIL,
1124 string_sprintf("authentication required but %s", fail_reason), DEFER,
1133 /* Construct AUTH appendix string for MAIL TO */
1136 buffer to build string
1137 addrlist chain of potential addresses to deliver
1138 ob transport options
1140 Globals smtp_authenticated
1141 client_authenticated_sender
1142 Return True on error, otherwise buffer has (possibly empty) terminated string
1146 smtp_mail_auth_str(uschar *buffer, unsigned bufsize, address_item *addrlist,
1147 smtp_transport_options_block *ob)
1149 uschar *local_authenticated_sender = authenticated_sender;
1152 debug_printf("smtp_mail_auth_str: as<%s> os<%s> SA<%s>\n", authenticated_sender, ob->authenticated_sender, smtp_authenticated?"Y":"N");
1155 if (ob->authenticated_sender != NULL)
1157 uschar *new = expand_string(ob->authenticated_sender);
1160 if (!expand_string_forcedfail)
1162 uschar *message = string_sprintf("failed to expand "
1163 "authenticated_sender: %s", expand_string_message);
1164 set_errno_nohost(addrlist, ERRNO_EXPANDFAIL, message, DEFER, FALSE);
1168 else if (new[0] != 0) local_authenticated_sender = new;
1171 /* Add the authenticated sender address if present */
1173 if ((smtp_authenticated || ob->authenticated_sender_force) &&
1174 local_authenticated_sender != NULL)
1176 string_format(buffer, bufsize, " AUTH=%s",
1177 auth_xtextencode(local_authenticated_sender,
1178 Ustrlen(local_authenticated_sender)));
1179 client_authenticated_sender = string_copy(local_authenticated_sender);
1189 #ifdef EXPERIMENTAL_DANE
1190 /* Lookup TLSA record for host/port.
1191 Return: OK success with dnssec; DANE mode
1192 DEFER Do not use this host now, may retry later
1193 FAIL_FORCED No TLSA record; DANE not usable
1194 FAIL Do not use this connection
1198 tlsa_lookup(const host_item * host, dns_answer * dnsa, BOOL dane_required)
1200 /* move this out to host.c given the similarity to dns_lookup() ? */
1202 const uschar * fullname = buffer;
1204 /* TLSA lookup string */
1205 (void)sprintf(CS buffer, "_%d._tcp.%.256s", host->port, host->name);
1207 switch (dns_lookup(dnsa, buffer, T_TLSA, &fullname))
1210 if (!dns_is_secure(dnsa))
1212 log_write(0, LOG_MAIN, "DANE error: TLSA lookup not DNSSEC");
1218 return DEFER; /* just defer this TLS'd conn */
1221 return dane_required ? FAIL : FAIL_FORCED;
1225 return dane_required ? FAIL : DEFER;
1232 typedef struct smtp_compare_s
1234 uschar *current_sender_address;
1235 struct transport_instance *tblock;
1239 Create a unique string that identifies this message, it is based on
1240 sender_address, helo_data and tls_certificate if enabled. */
1243 smtp_local_identity(uschar * sender, struct transport_instance * tblock)
1245 address_item * addr1;
1246 uschar * if1 = US"";
1247 uschar * helo1 = US"";
1249 uschar * tlsc1 = US"";
1251 uschar * save_sender_address = sender_address;
1252 uschar * local_identity = NULL;
1253 smtp_transport_options_block * ob =
1254 (smtp_transport_options_block *)tblock->options_block;
1256 sender_address = sender;
1258 addr1 = deliver_make_addr (sender, TRUE);
1259 deliver_set_expansions(addr1);
1262 if1 = expand_string(ob->interface);
1265 helo1 = expand_string(ob->helo_data);
1268 if (ob->tls_certificate)
1269 tlsc1 = expand_string(ob->tls_certificate);
1270 local_identity = string_sprintf ("%s^%s^%s", if1, helo1, tlsc1);
1272 local_identity = string_sprintf ("%s^%s", if1, helo1);
1275 deliver_set_expansions(NULL);
1276 sender_address = save_sender_address;
1278 return local_identity;
1283 /* This routine is a callback that is called from transport_check_waiting.
1284 This function will evaluate the incoming message versus the previous
1285 message. If the incoming message is using a different local identity then
1286 we will veto this new message. */
1289 smtp_are_same_identities(uschar * message_id, smtp_compare_t * s_compare)
1291 uschar * message_local_identity,
1292 * current_local_identity,
1293 * new_sender_address;
1295 current_local_identity =
1296 smtp_local_identity(s_compare->current_sender_address, s_compare->tblock);
1298 if (!(new_sender_address = deliver_get_sender_address(message_id)))
1301 message_local_identity =
1302 smtp_local_identity(new_sender_address, s_compare->tblock);
1304 return Ustrcmp(current_local_identity, message_local_identity) == 0;
1310 ehlo_response(uschar * buf, size_t bsize, uschar checks)
1313 if ( checks & PEER_OFFERED_TLS
1314 && pcre_exec(regex_STARTTLS, NULL, CS buf, bsize, 0, PCRE_EOPT, NULL, 0) < 0)
1315 checks &= ~PEER_OFFERED_TLS;
1318 if ( checks & PEER_OFFERED_IGNQ
1319 && pcre_exec(regex_IGNOREQUOTA, NULL, CS buf, bsize, 0,
1320 PCRE_EOPT, NULL, 0) < 0)
1321 checks &= ~PEER_OFFERED_IGNQ;
1323 #ifndef DISABLE_PRDR
1324 if ( checks & PEER_OFFERED_PRDR
1325 && pcre_exec(regex_PRDR, NULL, CS buf, bsize, 0, PCRE_EOPT, NULL, 0) < 0)
1326 checks &= ~PEER_OFFERED_PRDR;
1330 if ( checks & PEER_OFFERED_UTF8
1331 && pcre_exec(regex_UTF8, NULL, CS buf, bsize, 0, PCRE_EOPT, NULL, 0) < 0)
1332 checks &= ~PEER_OFFERED_UTF8;
1335 if ( checks & PEER_OFFERED_DSN
1336 && pcre_exec(regex_DSN, NULL, CS buf, bsize, 0, PCRE_EOPT, NULL, 0) < 0)
1337 checks &= ~PEER_OFFERED_DSN;
1339 if ( checks & PEER_OFFERED_PIPE
1340 && pcre_exec(regex_PIPELINING, NULL, CS buf, bsize, 0,
1341 PCRE_EOPT, NULL, 0) < 0)
1342 checks &= ~PEER_OFFERED_PIPE;
1344 if ( checks & PEER_OFFERED_SIZE
1345 && pcre_exec(regex_SIZE, NULL, CS buf, bsize, 0, PCRE_EOPT, NULL, 0) < 0)
1346 checks &= ~PEER_OFFERED_SIZE;
1352 /*************************************************
1353 * Deliver address list to given host *
1354 *************************************************/
1356 /* If continue_hostname is not null, we get here only when continuing to
1357 deliver down an existing channel. The channel was passed as the standard
1358 input. TLS is never active on a passed channel; the previous process always
1359 closes it down before passing the connection on.
1361 Otherwise, we have to make a connection to the remote host, and do the
1362 initial protocol exchange.
1364 When running as an MUA wrapper, if the sender or any recipient is rejected,
1365 temporarily or permanently, we force failure for all recipients.
1368 addrlist chain of potential addresses to deliver; only those whose
1369 transport_return field is set to PENDING_DEFER are currently
1370 being processed; others should be skipped - they have either
1371 been delivered to an earlier host or IP address, or been
1372 failed by one of them.
1373 host host to deliver to
1374 host_af AF_INET or AF_INET6
1375 port default TCP/IP port to use, in host byte order
1376 interface interface to bind to, or NULL
1377 tblock transport instance block
1378 message_defer set TRUE if yield is OK, but all addresses were deferred
1379 because of a non-recipient, non-host failure, that is, a
1380 4xx response to MAIL FROM, DATA, or ".". This is a defer
1381 that is specific to the message.
1382 suppress_tls if TRUE, don't attempt a TLS connection - this is set for
1383 a second attempt after TLS initialization fails
1385 Returns: OK - the connection was made and the delivery attempted;
1386 the result for each address is in its data block.
1387 DEFER - the connection could not be made, or something failed
1388 while setting up the SMTP session, or there was a
1389 non-message-specific error, such as a timeout.
1390 ERROR - a filter command is specified for this transport,
1391 and there was a problem setting it up; OR helo_data
1392 or add_headers or authenticated_sender is specified
1393 for this transport, and the string failed to expand
1397 smtp_deliver(address_item *addrlist, host_item *host, int host_af, int port,
1398 uschar *interface, transport_instance *tblock,
1399 BOOL *message_defer, BOOL suppress_tls)
1402 address_item *sync_addr;
1403 address_item *first_addr = addrlist;
1408 time_t start_delivery_time = time(NULL);
1409 smtp_transport_options_block *ob =
1410 (smtp_transport_options_block *)(tblock->options_block);
1411 BOOL lmtp = strcmpic(ob->protocol, US"lmtp") == 0;
1412 BOOL smtps = strcmpic(ob->protocol, US"smtps") == 0;
1414 BOOL send_rset = TRUE;
1415 BOOL send_quit = TRUE;
1416 BOOL setting_up = TRUE;
1417 BOOL completed_address = FALSE;
1420 BOOL pass_message = FALSE;
1421 uschar peer_offered = 0; /*XXX should this be handed on cf. tls_offered, smtp_use_dsn ? */
1422 #ifndef DISABLE_PRDR
1426 BOOL utf8_needed = FALSE;
1428 BOOL dsn_all_lasthop = TRUE;
1429 #if defined(SUPPORT_TLS) && defined(EXPERIMENTAL_DANE)
1431 BOOL dane_required = verify_check_given_host(&ob->hosts_require_dane, host) == OK;
1432 dns_answer tlsa_dnsa;
1434 smtp_inblock inblock;
1435 smtp_outblock outblock;
1436 int max_rcpt = tblock->max_addresses;
1437 uschar *igquotstr = US"";
1439 #ifdef EXPERIMENTAL_DSN_INFO
1440 uschar *smtp_greeting = NULL;
1441 uschar *helo_response = NULL;
1443 uschar *helo_data = NULL;
1445 uschar *message = NULL;
1446 uschar new_message_id[MESSAGE_ID_LENGTH + 1];
1448 uschar buffer[4096];
1449 uschar inbuffer[4096];
1450 uschar outbuffer[4096];
1452 suppress_tls = suppress_tls; /* stop compiler warning when no TLS support */
1454 *message_defer = FALSE;
1455 smtp_command = US"initial connection";
1456 if (max_rcpt == 0) max_rcpt = 999999;
1458 /* Set up the buffer for reading SMTP response packets. */
1460 inblock.buffer = inbuffer;
1461 inblock.buffersize = sizeof(inbuffer);
1462 inblock.ptr = inbuffer;
1463 inblock.ptrend = inbuffer;
1465 /* Set up the buffer for holding SMTP commands while pipelining */
1467 outblock.buffer = outbuffer;
1468 outblock.buffersize = sizeof(outbuffer);
1469 outblock.ptr = outbuffer;
1470 outblock.cmd_count = 0;
1471 outblock.authenticating = FALSE;
1473 /* Reset the parameters of a TLS session. */
1476 tls_out.cipher = NULL; /* the one we may use for this transport */
1477 tls_out.ourcert = NULL;
1478 tls_out.peercert = NULL;
1479 tls_out.peerdn = NULL;
1480 #if defined(SUPPORT_TLS) && !defined(USE_GNUTLS)
1483 tls_out.ocsp = OCSP_NOT_REQ;
1485 /* Flip the legacy TLS-related variables over to the outbound set in case
1486 they're used in the context of the transport. Don't bother resetting
1487 afterward as we're in a subprocess. */
1489 tls_modify_variables(&tls_out);
1494 set_errno_nohost(addrlist, ERRNO_TLSFAILURE, US"TLS support not available",
1500 /* Make a connection to the host if this isn't a continued delivery, and handle
1501 the initial interaction and HELO/EHLO/LHLO. Connect timeout errors are handled
1502 specially so they can be identified for retries. */
1504 if (continue_hostname == NULL)
1506 /* This puts port into host->port */
1507 inblock.sock = outblock.sock =
1508 smtp_connect(host, host_af, port, interface, ob->connect_timeout, tblock);
1510 if (inblock.sock < 0)
1512 set_errno_nohost(addrlist, (errno == ETIMEDOUT)? ERRNO_CONNECTTIMEOUT : errno,
1513 NULL, DEFER, FALSE);
1517 #if defined(SUPPORT_TLS) && defined(EXPERIMENTAL_DANE)
1519 tls_out.dane_verified = FALSE;
1520 tls_out.tlsa_usage = 0;
1522 if (host->dnssec == DS_YES)
1525 || verify_check_given_host(&ob->hosts_try_dane, host) == OK
1527 switch (rc = tlsa_lookup(host, &tlsa_dnsa, dane_required))
1529 case OK: dane = TRUE; break;
1530 case FAIL_FORCED: break;
1531 default: set_errno_nohost(addrlist, ERRNO_DNSDEFER,
1532 string_sprintf("DANE error: tlsa lookup %s",
1533 rc == DEFER ? "DEFER" : "FAIL"),
1538 else if (dane_required)
1540 set_errno_nohost(addrlist, ERRNO_DNSDEFER,
1541 string_sprintf("DANE error: %s lookup not DNSSEC", host->name),
1547 ob->tls_tempfail_tryclear = FALSE;
1551 /* Expand the greeting message while waiting for the initial response. (Makes
1552 sense if helo_data contains ${lookup dnsdb ...} stuff). The expansion is
1553 delayed till here so that $sending_interface and $sending_port are set. */
1555 helo_data = expand_string(ob->helo_data);
1559 uschar * errstr = NULL;
1560 if ((helo_data = string_domain_utf8_to_alabel(helo_data, &errstr)), errstr)
1562 errstr = string_sprintf("failed to expand helo_data: %s", errstr);
1563 set_errno_nohost(addrlist, ERRNO_EXPANDFAIL, errstr, DEFER, FALSE);
1570 /* The first thing is to wait for an initial OK response. The dreaded "goto"
1571 is nevertheless a reasonably clean way of programming this kind of logic,
1572 where you want to escape on any error. */
1576 BOOL good_response = smtp_read_response(&inblock, buffer, sizeof(buffer),
1577 '2', ob->command_timeout);
1578 #ifdef EXPERIMENTAL_DSN_INFO
1579 smtp_greeting = string_copy(buffer);
1581 if (!good_response) goto RESPONSE_FAILED;
1583 #ifndef DISABLE_EVENT
1586 lookup_dnssec_authenticated = host->dnssec==DS_YES ? US"yes"
1587 : host->dnssec==DS_NO ? US"no" : NULL;
1588 s = event_raise(tblock->event_action, US"smtp:connect", buffer);
1591 set_errno_nohost(addrlist, ERRNO_EXPANDFAIL,
1592 string_sprintf("deferred by smtp:connect event expansion: %s", s),
1600 /* Now check if the helo_data expansion went well, and sign off cleanly if
1603 if (helo_data == NULL)
1605 uschar *message = string_sprintf("failed to expand helo_data: %s",
1606 expand_string_message);
1607 set_errno_nohost(addrlist, ERRNO_EXPANDFAIL, message, DEFER, FALSE);
1613 /** Debugging without sending a message
1614 addrlist->transport_return = DEFER;
1618 /* Errors that occur after this point follow an SMTP command, which is
1619 left in big_buffer by smtp_write_command() for use in error messages. */
1621 smtp_command = big_buffer;
1623 /* Tell the remote who we are...
1625 February 1998: A convention has evolved that ESMTP-speaking MTAs include the
1626 string "ESMTP" in their greeting lines, so make Exim send EHLO if the
1627 greeting is of this form. The assumption was that the far end supports it
1628 properly... but experience shows that there are some that give 5xx responses,
1629 even though the banner includes "ESMTP" (there's a bloody-minded one that
1630 says "ESMTP not spoken here"). Cope with that case.
1632 September 2000: Time has passed, and it seems reasonable now to always send
1633 EHLO at the start. It is also convenient to make the change while installing
1636 July 2003: Joachim Wieland met a broken server that advertises "PIPELINING"
1637 but times out after sending MAIL FROM, RCPT TO and DATA all together. There
1638 would be no way to send out the mails, so there is now a host list
1639 "hosts_avoid_esmtp" that disables ESMTP for special hosts and solves the
1640 PIPELINING problem as well. Maybe it can also be useful to cure other
1641 problems with broken servers.
1643 Exim originally sent "Helo" at this point and ran for nearly a year that way.
1644 Then somebody tried it with a Microsoft mailer... It seems that all other
1645 mailers use upper case for some reason (the RFC is quite clear about case
1646 independence) so, for peace of mind, I gave in. */
1648 esmtp = verify_check_given_host(&ob->hosts_avoid_esmtp, host) != OK;
1650 /* Alas; be careful, since this goto is not an error-out, so conceivably
1651 we might set data between here and the target which we assume to exist
1652 and be usable. I can see this coming back to bite us. */
1657 suppress_tls = FALSE;
1658 ob->tls_tempfail_tryclear = FALSE;
1659 smtp_command = US"SSL-on-connect";
1666 if (smtp_write_command(&outblock, FALSE, "%s %s\r\n",
1667 lmtp? "LHLO" : "EHLO", helo_data) < 0)
1669 if (!smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
1670 ob->command_timeout))
1672 if (errno != 0 || buffer[0] == 0 || lmtp)
1674 #ifdef EXPERIMENTAL_DSN_INFO
1675 helo_response = string_copy(buffer);
1677 goto RESPONSE_FAILED;
1681 #ifdef EXPERIMENTAL_DSN_INFO
1682 helo_response = string_copy(buffer);
1688 debug_printf("not sending EHLO (host matches hosts_avoid_esmtp)\n");
1695 if (smtp_write_command(&outblock, FALSE, "HELO %s\r\n", helo_data) < 0)
1697 good_response = smtp_read_response(&inblock, buffer, sizeof(buffer),
1698 '2', ob->command_timeout);
1699 #ifdef EXPERIMENTAL_DSN_INFO
1700 helo_response = string_copy(buffer);
1702 if (!good_response) goto RESPONSE_FAILED;
1706 peer_offered = ehlo_response(buffer, Ustrlen(buffer),
1707 PEER_OFFERED_TLS /* others checked later */
1710 /* Set tls_offered if the response to EHLO specifies support for STARTTLS. */
1713 tls_offered = !!(peer_offered & PEER_OFFERED_TLS);
1717 /* For continuing deliveries down the same channel, the socket is the standard
1718 input, and we don't need to redo EHLO here (but may need to do so for TLS - see
1719 below). Set up the pointer to where subsequent commands will be left, for
1720 error messages. Note that smtp_use_size and smtp_use_pipelining will have been
1721 set from the command line if they were set in the process that passed the
1724 /*XXX continue case needs to propagate DSN_INFO, prob. in deliver.c
1725 as the contine goes via transport_pass_socket() and doublefork and exec.
1726 It does not wait. Unclear how we keep separate host's responses
1727 separate - we could match up by host ip+port as a bodge. */
1731 inblock.sock = outblock.sock = fileno(stdin);
1732 smtp_command = big_buffer;
1733 host->port = port; /* Record the port that was used */
1736 /* If TLS is available on this connection, whether continued or not, attempt to
1737 start up a TLS session, unless the host is in hosts_avoid_tls. If successful,
1738 send another EHLO - the server may give a different answer in secure mode. We
1739 use a separate buffer for reading the response to STARTTLS so that if it is
1740 negative, the original EHLO data is available for subsequent analysis, should
1741 the client not be required to use TLS. If the response is bad, copy the buffer
1742 for error analysis. */
1747 && verify_check_given_host(&ob->hosts_avoid_tls, host) != OK)
1749 uschar buffer2[4096];
1750 if (smtp_write_command(&outblock, FALSE, "STARTTLS\r\n") < 0)
1753 /* If there is an I/O error, transmission of this message is deferred. If
1754 there is a temporary rejection of STARRTLS and tls_tempfail_tryclear is
1755 false, we also defer. However, if there is a temporary rejection of STARTTLS
1756 and tls_tempfail_tryclear is true, or if there is an outright rejection of
1757 STARTTLS, we carry on. This means we will try to send the message in clear,
1758 unless the host is in hosts_require_tls (tested below). */
1760 if (!smtp_read_response(&inblock, buffer2, sizeof(buffer2), '2',
1761 ob->command_timeout))
1765 || (buffer2[0] == '4' && !ob->tls_tempfail_tryclear)
1768 Ustrncpy(buffer, buffer2, sizeof(buffer));
1769 goto RESPONSE_FAILED;
1773 /* STARTTLS accepted: try to negotiate a TLS session. */
1778 int rc = tls_client_start(inblock.sock, host, addrlist, tblock
1779 # ifdef EXPERIMENTAL_DANE
1780 , dane ? &tlsa_dnsa : NULL
1784 /* TLS negotiation failed; give an error. From outside, this function may
1785 be called again to try in clear on a new connection, if the options permit
1786 it for this host. */
1790 # ifdef EXPERIMENTAL_DANE
1791 if (rc == DEFER && dane)
1793 log_write(0, LOG_MAIN,
1794 "DANE attempt failed; no TLS connection to %s [%s]",
1795 host->name, host->address);
1799 save_errno = ERRNO_TLSFAILURE;
1800 message = US"failure while setting up TLS session";
1805 /* TLS session is set up */
1807 for (addr = addrlist; addr; addr = addr->next)
1808 if (addr->transport_return == PENDING_DEFER)
1810 addr->cipher = tls_out.cipher;
1811 addr->ourcert = tls_out.ourcert;
1812 addr->peercert = tls_out.peercert;
1813 addr->peerdn = tls_out.peerdn;
1814 addr->ocsp = tls_out.ocsp;
1819 /* if smtps, we'll have smtp_command set to something else; always safe to
1821 smtp_command = big_buffer;
1823 /* If we started TLS, redo the EHLO/LHLO exchange over the secure channel. If
1824 helo_data is null, we are dealing with a connection that was passed from
1825 another process, and so we won't have expanded helo_data above. We have to
1826 expand it here. $sending_ip_address and $sending_port are set up right at the
1827 start of the Exim process (in exim.c). */
1829 if (tls_out.active >= 0)
1834 if (helo_data == NULL)
1836 helo_data = expand_string(ob->helo_data);
1837 if (helo_data == NULL)
1839 uschar *message = string_sprintf("failed to expand helo_data: %s",
1840 expand_string_message);
1841 set_errno_nohost(addrlist, ERRNO_EXPANDFAIL, message, DEFER, FALSE);
1847 /* For SMTPS we need to wait for the initial OK response. */
1850 good_response = smtp_read_response(&inblock, buffer, sizeof(buffer),
1851 '2', ob->command_timeout);
1852 #ifdef EXPERIMENTAL_DSN_INFO
1853 smtp_greeting = string_copy(buffer);
1855 if (!good_response) goto RESPONSE_FAILED;
1859 greeting_cmd = "EHLO";
1862 greeting_cmd = "HELO";
1864 debug_printf("not sending EHLO (host matches hosts_avoid_esmtp)\n");
1867 if (smtp_write_command(&outblock, FALSE, "%s %s\r\n",
1868 lmtp? "LHLO" : greeting_cmd, helo_data) < 0)
1870 good_response = smtp_read_response(&inblock, buffer, sizeof(buffer),
1871 '2', ob->command_timeout);
1872 #ifdef EXPERIMENTAL_DSN_INFO
1873 helo_response = string_copy(buffer);
1875 if (!good_response) goto RESPONSE_FAILED;
1878 /* If the host is required to use a secure channel, ensure that we
1882 # ifdef EXPERIMENTAL_DANE
1885 || verify_check_given_host(&ob->hosts_require_tls, host) == OK
1888 save_errno = ERRNO_TLSREQUIRED;
1889 message = string_sprintf("a TLS session is required, but %s",
1890 tls_offered ? "an attempt to start TLS failed"
1891 : "the server did not offer TLS support");
1894 #endif /*SUPPORT_TLS*/
1896 /* If TLS is active, we have just started it up and re-done the EHLO command,
1897 so its response needs to be analyzed. If TLS is not active and this is a
1898 continued session down a previously-used socket, we haven't just done EHLO, so
1901 if (continue_hostname == NULL
1903 || tls_out.active >= 0
1908 peer_offered = ehlo_response(buffer, Ustrlen(buffer),
1910 | (lmtp && ob->lmtp_ignore_quota ? PEER_OFFERED_IGNQ : 0)
1913 | (addrlist->prop.utf8_msg ? PEER_OFFERED_UTF8 : 0)
1914 /*XXX if we hand peercaps on to continued-conn processes,
1915 must not depend on this addr */
1919 | (ob->size_addition >= 0 ? PEER_OFFERED_SIZE : 0)
1922 /* Set for IGNOREQUOTA if the response to LHLO specifies support and the
1923 lmtp_ignore_quota option was set. */
1925 igquotstr = peer_offered & PEER_OFFERED_IGNQ ? US" IGNOREQUOTA" : US"";
1927 /* If the response to EHLO specified support for the SIZE parameter, note
1928 this, provided size_addition is non-negative. */
1930 smtp_use_size = !!(peer_offered & PEER_OFFERED_SIZE);
1932 /* Note whether the server supports PIPELINING. If hosts_avoid_esmtp matched
1933 the current host, esmtp will be false, so PIPELINING can never be used. If
1934 the current host matches hosts_avoid_pipelining, don't do it. */
1936 smtp_use_pipelining = peer_offered & PEER_OFFERED_PIPE
1937 && verify_check_given_host(&ob->hosts_avoid_pipelining, host) != OK;
1939 DEBUG(D_transport) debug_printf("%susing PIPELINING\n",
1940 smtp_use_pipelining ? "" : "not ");
1942 #ifndef DISABLE_PRDR
1943 if ( peer_offered & PEER_OFFERED_PRDR
1944 && verify_check_given_host(&ob->hosts_try_prdr, host) != OK)
1945 peer_offered &= ~PEER_OFFERED_PRDR;
1947 if (peer_offered & PEER_OFFERED_PRDR)
1948 {DEBUG(D_transport) debug_printf("PRDR usable\n");}
1951 /* Note if the server supports DSN */
1952 smtp_use_dsn = !!(peer_offered & PEER_OFFERED_DSN);
1953 DEBUG(D_transport) debug_printf("%susing DSN\n", smtp_use_dsn ? "" : "not ");
1955 /* Note if the response to EHLO specifies support for the AUTH extension.
1956 If it has, check that this host is one we want to authenticate to, and do
1957 the business. The host name and address must be available when the
1958 authenticator's client driver is running. */
1960 switch (yield = smtp_auth(buffer, sizeof(buffer), addrlist, host,
1961 ob, esmtp, &inblock, &outblock))
1963 default: goto SEND_QUIT;
1965 case FAIL_SEND: goto SEND_FAILED;
1966 case FAIL: goto RESPONSE_FAILED;
1969 pipelining_active = smtp_use_pipelining;
1971 /* The setting up of the SMTP call is now complete. Any subsequent errors are
1972 message-specific. */
1977 if (addrlist->prop.utf8_msg)
1979 utf8_needed = !addrlist->prop.utf8_downcvt
1980 && !addrlist->prop.utf8_downcvt_maybe;
1981 DEBUG(D_transport) if (!utf8_needed) debug_printf("utf8: %s downconvert\n",
1982 addrlist->prop.utf8_downcvt ? "mandatory" : "optional");
1985 /* If this is an international message we need the host to speak SMTPUTF8 */
1986 if (utf8_needed && !(peer_offered & PEER_OFFERED_UTF8))
1988 errno = ERRNO_UTF8_FWD;
1989 goto RESPONSE_FAILED;
1993 /* If there is a filter command specified for this transport, we can now
1994 set it up. This cannot be done until the identify of the host is known. */
1996 if (tblock->filter_command != NULL)
2000 sprintf(CS buffer, "%.50s transport", tblock->name);
2001 rc = transport_set_up_command(&transport_filter_argv, tblock->filter_command,
2002 TRUE, DEFER, addrlist, buffer, NULL);
2003 transport_filter_timeout = tblock->filter_timeout;
2005 /* On failure, copy the error to all addresses, abandon the SMTP call, and
2010 set_errno_nohost(addrlist->next, addrlist->basic_errno, addrlist->message, DEFER,
2018 /* For messages that have more than the maximum number of envelope recipients,
2019 we want to send several transactions down the same SMTP connection. (See
2020 comments in deliver.c as to how this reconciles, heuristically, with
2021 remote_max_parallel.) This optimization was added to Exim after the following
2022 code was already working. The simplest way to put it in without disturbing the
2023 code was to use a goto to jump back to this point when there is another
2024 transaction to handle. */
2027 sync_addr = first_addr;
2031 completed_address = FALSE;
2034 /* Initiate a message transfer. If we know the receiving MTA supports the SIZE
2035 qualification, send it, adding something to the message size to allow for
2036 imprecision and things that get added en route. Exim keeps the number of lines
2037 in a message, so we can give an accurate value for the original message, but we
2038 need some additional to handle added headers. (Double "." characters don't get
2039 included in the count.) */
2046 sprintf(CS p, " SIZE=%d", message_size+message_linecount+ob->size_addition);
2050 #ifndef DISABLE_PRDR
2051 prdr_active = FALSE;
2052 if (peer_offered & PEER_OFFERED_PRDR)
2053 for (addr = first_addr; addr; addr = addr->next)
2054 if (addr->transport_return == PENDING_DEFER)
2056 for (addr = addr->next; addr; addr = addr->next)
2057 if (addr->transport_return == PENDING_DEFER)
2058 { /* at least two recipients to send */
2060 sprintf(CS p, " PRDR"); p += 5;
2068 if ( addrlist->prop.utf8_msg
2069 && !addrlist->prop.utf8_downcvt
2070 && peer_offered & PEER_OFFERED_UTF8
2072 sprintf(CS p, " SMTPUTF8"), p += 9;
2075 /* check if all addresses have lasthop flag */
2076 /* do not send RET and ENVID if true */
2077 for (dsn_all_lasthop = TRUE, addr = first_addr;
2078 address_count < max_rcpt && addr != NULL;
2080 if ((addr->dsn_flags & rf_dsnlasthop) != 1)
2082 dsn_all_lasthop = FALSE;
2086 /* Add any DSN flags to the mail command */
2088 if (smtp_use_dsn && !dsn_all_lasthop)
2090 if (dsn_ret == dsn_ret_hdrs)
2092 Ustrcpy(p, " RET=HDRS"); p += 9;
2094 else if (dsn_ret == dsn_ret_full)
2096 Ustrcpy(p, " RET=FULL"); p += 9;
2098 if (dsn_envid != NULL)
2100 string_format(p, sizeof(buffer) - (p-buffer), " ENVID=%s", dsn_envid);
2105 /* If an authenticated_sender override has been specified for this transport
2106 instance, expand it. If the expansion is forced to fail, and there was already
2107 an authenticated_sender for this message, the original value will be used.
2108 Other expansion failures are serious. An empty result is ignored, but there is
2109 otherwise no check - this feature is expected to be used with LMTP and other
2110 cases where non-standard addresses (e.g. without domains) might be required. */
2112 if (smtp_mail_auth_str(p, sizeof(buffer) - (p-buffer), addrlist, ob))
2118 /* From here until we send the DATA command, we can make use of PIPELINING
2119 if the server host supports it. The code has to be able to check the responses
2120 at any point, for when the buffer fills up, so we write it totally generally.
2121 When PIPELINING is off, each command written reports that it has flushed the
2124 pending_MAIL = TRUE; /* The block starts with MAIL */
2127 uschar * s = return_path;
2129 uschar * errstr = NULL;
2131 /* If we must downconvert, do the from-address here. Remember we had to
2132 for the to-addresses (done below), and also (ugly) for re-doing when building
2133 the delivery log line. */
2135 if ( addrlist->prop.utf8_msg
2136 && (addrlist->prop.utf8_downcvt || !(peer_offered & PEER_OFFERED_UTF8))
2139 if (s = string_address_utf8_to_alabel(return_path, &errstr), errstr)
2141 set_errno_nohost(addrlist, ERRNO_EXPANDFAIL, errstr, DEFER, FALSE);
2145 setflag(addrlist, af_utf8_downcvt);
2149 rc = smtp_write_command(&outblock, smtp_use_pipelining,
2150 "MAIL FROM:<%s>%s\r\n", s, buffer);
2153 mail_command = string_copy(big_buffer); /* Save for later error message */
2157 case -1: /* Transmission error */
2160 case +1: /* Block was sent */
2161 if (!smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
2162 ob->command_timeout))
2164 if (errno == 0 && buffer[0] == '4')
2166 errno = ERRNO_MAIL4XX;
2167 addrlist->more_errno |= ((buffer[1] - '0')*10 + buffer[2] - '0') << 8;
2169 goto RESPONSE_FAILED;
2171 pending_MAIL = FALSE;
2175 /* Pass over all the relevant recipient addresses for this host, which are the
2176 ones that have status PENDING_DEFER. If we are using PIPELINING, we can send
2177 several before we have to read the responses for those seen so far. This
2178 checking is done by a subroutine because it also needs to be done at the end.
2179 Send only up to max_rcpt addresses at a time, leaving first_addr pointing to
2180 the next one if not all are sent.
2182 In the MUA wrapper situation, we want to flush the PIPELINING buffer for the
2183 last address because we want to abort if any recipients have any kind of
2184 problem, temporary or permanent. We know that all recipient addresses will have
2185 the PENDING_DEFER status, because only one attempt is ever made, and we know
2186 that max_rcpt will be large, so all addresses will be done at once. */
2188 for (addr = first_addr;
2189 addr && address_count < max_rcpt;
2196 addr->dsn_aware = smtp_use_dsn ? dsn_support_yes : dsn_support_no;
2198 if (addr->transport_return != PENDING_DEFER) continue;
2201 no_flush = smtp_use_pipelining && (!mua_wrapper || addr->next);
2203 /* Add any DSN flags to the rcpt command and add to the sent string */
2208 if (smtp_use_dsn && !(addr->dsn_flags & rf_dsnlasthop))
2210 if ((addr->dsn_flags & rf_dsnflags) != 0)
2214 Ustrcpy(p, " NOTIFY=");
2216 for (i = 0; i < 4; i++)
2217 if ((addr->dsn_flags & rf_list[i]) != 0)
2219 if (!first) *p++ = ',';
2221 Ustrcpy(p, rf_names[i]);
2226 if (addr->dsn_orcpt)
2228 string_format(p, sizeof(buffer) - (p-buffer), " ORCPT=%s",
2234 /* Now send the RCPT command, and process outstanding responses when
2235 necessary. After a timeout on RCPT, we just end the function, leaving the
2236 yield as OK, because this error can often mean that there is a problem with
2237 just one address, so we don't want to delay the host. */
2239 rcpt_addr = transport_rcpt_address(addr, tblock->rcpt_include_affixes);
2243 uschar * dummy_errstr;
2244 if ( testflag(addrlist, af_utf8_downcvt)
2245 && (rcpt_addr = string_address_utf8_to_alabel(rcpt_addr, &dummy_errstr),
2249 errno = ERRNO_EXPANDFAIL;
2255 count = smtp_write_command(&outblock, no_flush, "RCPT TO:<%s>%s%s\r\n",
2256 rcpt_addr, igquotstr, buffer);
2258 if (count < 0) goto SEND_FAILED;
2261 switch(sync_responses(first_addr, tblock->rcpt_include_affixes,
2262 &sync_addr, host, count, ob->address_retry_include_sender,
2263 pending_MAIL, 0, &inblock, ob->command_timeout, buffer,
2266 case 3: ok = TRUE; /* 2xx & 5xx => OK & progress made */
2267 case 2: completed_address = TRUE; /* 5xx (only) => progress made */
2270 case 1: ok = TRUE; /* 2xx (only) => OK, but if LMTP, */
2271 if (!lmtp) completed_address = TRUE; /* can't tell about progress yet */
2272 case 0: /* No 2xx or 5xx, but no probs */
2275 case -1: goto END_OFF; /* Timeout on RCPT */
2276 default: goto RESPONSE_FAILED; /* I/O error, or any MAIL error */
2278 pending_MAIL = FALSE; /* Dealt with MAIL */
2280 } /* Loop for next address */
2282 /* If we are an MUA wrapper, abort if any RCPTs were rejected, either
2283 permanently or temporarily. We should have flushed and synced after the last
2288 address_item *badaddr;
2289 for (badaddr = first_addr; badaddr; badaddr = badaddr->next)
2290 if (badaddr->transport_return != PENDING_OK)
2292 /*XXX could we find a better errno than 0 here? */
2293 set_errno_nohost(addrlist, 0, badaddr->message, FAIL,
2294 testflag(badaddr, af_pass_message));
2300 /* If ok is TRUE, we know we have got at least one good recipient, and must now
2301 send DATA, but if it is FALSE (in the normal, non-wrapper case), we may still
2302 have a good recipient buffered up if we are pipelining. We don't want to waste
2303 time sending DATA needlessly, so we only send it if either ok is TRUE or if we
2304 are pipelining. The responses are all handled by sync_responses(). */
2306 if (ok || (smtp_use_pipelining && !mua_wrapper))
2308 int count = smtp_write_command(&outblock, FALSE, "DATA\r\n");
2309 if (count < 0) goto SEND_FAILED;
2310 switch(sync_responses(first_addr, tblock->rcpt_include_affixes, &sync_addr,
2311 host, count, ob->address_retry_include_sender, pending_MAIL,
2312 ok? +1 : -1, &inblock, ob->command_timeout, buffer, sizeof(buffer)))
2314 case 3: ok = TRUE; /* 2xx & 5xx => OK & progress made */
2315 case 2: completed_address = TRUE; /* 5xx (only) => progress made */
2318 case 1: ok = TRUE; /* 2xx (only) => OK, but if LMTP, */
2319 if (!lmtp) completed_address = TRUE; /* can't tell about progress yet */
2320 case 0: break; /* No 2xx or 5xx, but no probs */
2322 case -1: goto END_OFF; /* Timeout on RCPT */
2323 default: goto RESPONSE_FAILED; /* I/O error, or any MAIL/DATA error */
2325 pipelining_active = FALSE;
2328 /* Save the first address of the next batch. */
2332 /* If there were no good recipients (but otherwise there have been no
2333 problems), just set ok TRUE, since we have handled address-specific errors
2334 already. Otherwise, it's OK to send the message. Use the check/escape mechanism
2335 for handling the SMTP dot-handling protocol, flagging to apply to headers as
2336 well as body. Set the appropriate timeout value to be used for each chunk.
2337 (Haven't been able to make it work using select() for writing yet.) */
2343 transport_ctx tctx = {
2346 US".", US"..", /* Escaping strings */
2347 topt_use_crlf | topt_end_dot | topt_escape_headers
2348 | (tblock->body_only ? topt_no_headers : 0)
2349 | (tblock->headers_only ? topt_no_body : 0)
2350 | (tblock->return_path_add ? topt_add_return_path : 0)
2351 | (tblock->delivery_date_add ? topt_add_delivery_date : 0)
2352 | (tblock->envelope_to_add ? topt_add_envelope_to : 0)
2355 sigalrm_seen = FALSE;
2356 transport_write_timeout = ob->data_timeout;
2357 smtp_command = US"sending data block"; /* For error messages */
2358 DEBUG(D_transport|D_v)
2359 debug_printf(" SMTP>> writing message and terminating \".\"\n");
2360 transport_count = 0;
2362 #ifndef DISABLE_DKIM
2363 ok = dkim_transport_write_message(inblock.sock, &tctx, &ob->dkim);
2365 ok = transport_write_message(inblock.sock, &tctx, 0);
2368 /* transport_write_message() uses write() because it is called from other
2369 places to write to non-sockets. This means that under some OS (e.g. Solaris)
2370 it can exit with "Broken pipe" as its error. This really means that the
2371 socket got closed at the far end. */
2373 transport_write_timeout = 0; /* for subsequent transports */
2375 /* Failure can either be some kind of I/O disaster (including timeout),
2376 or the failure of a transport filter or the expansion of added headers. */
2380 buffer[0] = 0; /* There hasn't been a response */
2381 goto RESPONSE_FAILED;
2384 /* We used to send the terminating "." explicitly here, but because of
2385 buffering effects at both ends of TCP/IP connections, you don't gain
2386 anything by keeping it separate, so it might as well go in the final
2387 data buffer for efficiency. This is now done by setting the topt_end_dot
2390 smtp_command = US"end of data";
2392 #ifndef DISABLE_PRDR
2393 /* For PRDR we optionally get a partial-responses warning
2394 * followed by the individual responses, before going on with
2395 * the overall response. If we don't get the warning then deal
2396 * with per non-PRDR. */
2399 ok = smtp_read_response(&inblock, buffer, sizeof(buffer), '3',
2401 if (!ok && errno == 0)
2404 case '2': prdr_active = FALSE;
2407 case '4': errno = ERRNO_DATA4XX;
2408 addrlist->more_errno |= ((buffer[1] - '0')*10 + buffer[2] - '0') << 8;
2415 /* For non-PRDR SMTP, we now read a single response that applies to the
2416 whole message. If it is OK, then all the addresses have been delivered. */
2420 ok = smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
2422 if (!ok && errno == 0 && buffer[0] == '4')
2424 errno = ERRNO_DATA4XX;
2425 addrlist->more_errno |= ((buffer[1] - '0')*10 + buffer[2] - '0') << 8;
2429 /* For LMTP, we get back a response for every RCPT command that we sent;
2430 some may be accepted and some rejected. For those that get a response, their
2431 status is fixed; any that are accepted have been handed over, even if later
2432 responses crash - at least, that's how I read RFC 2033.
2434 If all went well, mark the recipient addresses as completed, record which
2435 host/IPaddress they were delivered to, and cut out RSET when sending another
2436 message down the same channel. Write the completed addresses to the journal
2437 now so that they are recorded in case there is a crash of hardware or
2438 software before the spool gets updated. Also record the final SMTP
2439 confirmation if needed (for SMTP only). */
2444 int delivery_time = (int)(time(NULL) - start_delivery_time);
2446 uschar *conf = NULL;
2449 pipelining_active = FALSE;
2451 /* Set up confirmation if needed - applies only to SMTP */
2454 #ifdef DISABLE_EVENT
2455 LOGGING(smtp_confirmation) &&
2460 const uschar *s = string_printing(buffer);
2461 /* deconst cast ok here as string_printing was checked to have alloc'n'copied */
2462 conf = (s == buffer)? (uschar *)string_copy(s) : US s;
2465 /* Process all transported addresses - for LMTP or PRDR, read a status for
2468 for (addr = addrlist; addr != first_addr; addr = addr->next)
2470 if (addr->transport_return != PENDING_OK) continue;
2472 /* LMTP - if the response fails badly (e.g. timeout), use it for all the
2473 remaining addresses. Otherwise, it's a return code for just the one
2474 address. For temporary errors, add a retry item for the address so that
2475 it doesn't get tried again too soon. */
2477 #ifndef DISABLE_PRDR
2478 if (lmtp || prdr_active)
2483 if (!smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
2486 if (errno != 0 || buffer[0] == 0) goto RESPONSE_FAILED;
2487 addr->message = string_sprintf(
2488 #ifndef DISABLE_PRDR
2489 "%s error after %s: %s", prdr_active ? "PRDR":"LMTP",
2491 "LMTP error after %s: %s",
2493 big_buffer, string_printing(buffer));
2494 setflag(addr, af_pass_message); /* Allow message to go to user */
2495 if (buffer[0] == '5')
2496 addr->transport_return = FAIL;
2499 errno = ERRNO_DATA4XX;
2500 addr->more_errno |= ((buffer[1] - '0')*10 + buffer[2] - '0') << 8;
2501 addr->transport_return = DEFER;
2502 #ifndef DISABLE_PRDR
2505 retry_add_item(addr, addr->address_retry_key, 0);
2509 completed_address = TRUE; /* NOW we can set this flag */
2510 if (LOGGING(smtp_confirmation))
2512 const uschar *s = string_printing(buffer);
2513 /* deconst cast ok here as string_printing was checked to have alloc'n'copied */
2514 conf = (s == buffer)? (uschar *)string_copy(s) : US s;
2518 /* SMTP, or success return from LMTP for this address. Pass back the
2519 actual host that was used. */
2521 addr->transport_return = OK;
2522 addr->more_errno = delivery_time;
2523 addr->host_used = host;
2524 addr->special_action = flag;
2525 addr->message = conf;
2526 #ifndef DISABLE_PRDR
2527 if (prdr_active) addr->flags |= af_prdr_used;
2531 #ifndef DISABLE_PRDR
2535 /* Update the journal. For homonymic addresses, use the base address plus
2536 the transport name. See lots of comments in deliver.c about the reasons
2537 for the complications when homonyms are involved. Just carry on after
2538 write error, as it may prove possible to update the spool file later. */
2540 if (testflag(addr, af_homonym))
2541 sprintf(CS buffer, "%.500s/%s\n", addr->unique + 3, tblock->name);
2543 sprintf(CS buffer, "%.500s\n", addr->unique);
2545 DEBUG(D_deliver) debug_printf("journalling %s\n", buffer);
2546 len = Ustrlen(CS buffer);
2547 if (write(journal_fd, buffer, len) != len)
2548 log_write(0, LOG_MAIN|LOG_PANIC, "failed to write journal for "
2549 "%s: %s", buffer, strerror(errno));
2553 #ifndef DISABLE_PRDR
2556 /* PRDR - get the final, overall response. For any non-success
2557 upgrade all the address statuses. */
2558 ok = smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
2562 if(errno == 0 && buffer[0] == '4')
2564 errno = ERRNO_DATA4XX;
2565 addrlist->more_errno |= ((buffer[1] - '0')*10 + buffer[2] - '0') << 8;
2567 for (addr = addrlist; addr != first_addr; addr = addr->next)
2568 if (buffer[0] == '5' || addr->transport_return == OK)
2569 addr->transport_return = PENDING_OK; /* allow set_errno action */
2570 goto RESPONSE_FAILED;
2573 /* Update the journal, or setup retry. */
2574 for (addr = addrlist; addr != first_addr; addr = addr->next)
2575 if (addr->transport_return == OK)
2577 if (testflag(addr, af_homonym))
2578 sprintf(CS buffer, "%.500s/%s\n", addr->unique + 3, tblock->name);
2580 sprintf(CS buffer, "%.500s\n", addr->unique);
2582 DEBUG(D_deliver) debug_printf("journalling(PRDR) %s\n", buffer);
2583 len = Ustrlen(CS buffer);
2584 if (write(journal_fd, buffer, len) != len)
2585 log_write(0, LOG_MAIN|LOG_PANIC, "failed to write journal for "
2586 "%s: %s", buffer, strerror(errno));
2588 else if (addr->transport_return == DEFER)
2589 retry_add_item(addr, addr->address_retry_key, -2);
2593 /* Ensure the journal file is pushed out to disk. */
2595 if (EXIMfsync(journal_fd) < 0)
2596 log_write(0, LOG_MAIN|LOG_PANIC, "failed to fsync journal: %s",
2602 /* Handle general (not specific to one address) failures here. The value of ok
2603 is used to skip over this code on the falling through case. A timeout causes a
2604 deferral. Other errors may defer or fail according to the response code, and
2605 may set up a special errno value, e.g. after connection chopped, which is
2606 assumed if errno == 0 and there is no text in the buffer. If control reaches
2607 here during the setting up phase (i.e. before MAIL FROM) then always defer, as
2608 the problem is not related to this specific message. */
2613 uschar * set_message;
2619 send_quit = check_response(host, &save_errno, addrlist->more_errno,
2620 buffer, &code, &message, &pass_message);
2628 message = US string_sprintf("send() to %s [%s] failed: %s",
2629 host->name, host->address, strerror(save_errno));
2634 /* This label is jumped to directly when a TLS negotiation has failed,
2635 or was not done for a host for which it is required. Values will be set
2636 in message and save_errno, and setting_up will always be true. Treat as
2637 a temporary error. */
2644 /* If the failure happened while setting up the call, see if the failure was
2645 a 5xx response (this will either be on connection, or following HELO - a 5xx
2646 after EHLO causes it to try HELO). If so, fail all addresses, as this host is
2647 never going to accept them. For other errors during setting up (timeouts or
2648 whatever), defer all addresses, and yield DEFER, so that the host is not
2649 tried again for a while. */
2652 ok = FALSE; /* For when reached by GOTO */
2653 set_message = message;
2660 yield = set_rc = DEFER;
2663 /* We want to handle timeouts after MAIL or "." and loss of connection after
2664 "." specially. They can indicate a problem with the sender address or with
2665 the contents of the message rather than a real error on the connection. These
2666 cases are treated in the same way as a 4xx response. This next bit of code
2667 does the classification. */
2676 case ERRNO_UTF8_FWD:
2683 message_error = TRUE;
2687 message_error = Ustrncmp(smtp_command,"MAIL",4) == 0 ||
2688 Ustrncmp(smtp_command,"end ",4) == 0;
2691 case ERRNO_SMTPCLOSED:
2692 message_error = Ustrncmp(smtp_command,"end ",4) == 0;
2696 message_error = FALSE;
2700 /* Handle the cases that are treated as message errors. These are:
2702 (a) negative response or timeout after MAIL
2703 (b) negative response after DATA
2704 (c) negative response or timeout or dropped connection after "."
2705 (d) utf8 support required and not offered
2707 It won't be a negative response or timeout after RCPT, as that is dealt
2708 with separately above. The action in all cases is to set an appropriate
2709 error code for all the addresses, but to leave yield set to OK because the
2710 host itself has not failed. Of course, it might in practice have failed
2711 when we've had a timeout, but if so, we'll discover that at the next
2712 delivery attempt. For a temporary error, set the message_defer flag, and
2713 write to the logs for information if this is not the last host. The error
2714 for the last host will be logged as part of the address's log line. */
2718 if (mua_wrapper) code = '5'; /* Force hard failure in wrapper mode */
2720 /* If there's an errno, the message contains just the identity of
2725 else /* Anything other than 5 is treated as temporary */
2729 message = US string_sprintf("%s: %s", message, strerror(save_errno));
2730 if (host->next != NULL) log_write(0, LOG_MAIN, "%s", message);
2731 msglog_line(host, message);
2732 *message_defer = TRUE;
2736 /* Otherwise, we have an I/O error or a timeout other than after MAIL or
2737 ".", or some other transportation error. We defer all addresses and yield
2738 DEFER, except for the case of failed add_headers expansion, or a transport
2739 filter failure, when the yield should be ERROR, to stop it trying other
2745 yield = (save_errno == ERRNO_CHHEADER_FAIL ||
2746 save_errno == ERRNO_FILTER_FAIL)? ERROR : DEFER;
2750 set_errno(addrlist, save_errno, set_message, set_rc, pass_message, host
2751 #ifdef EXPERIMENTAL_DSN_INFO
2752 , smtp_greeting, helo_response
2758 /* If all has gone well, send_quit will be set TRUE, implying we can end the
2759 SMTP session tidily. However, if there were too many addresses to send in one
2760 message (indicated by first_addr being non-NULL) we want to carry on with the
2761 rest of them. Also, it is desirable to send more than one message down the SMTP
2762 connection if there are several waiting, provided we haven't already sent so
2763 many as to hit the configured limit. The function transport_check_waiting looks
2764 for a waiting message and returns its id. Then transport_pass_socket tries to
2765 set up a continued delivery by passing the socket on to another process. The
2766 variable send_rset is FALSE if a message has just been successfully transfered.
2768 If we are already sending down a continued channel, there may be further
2769 addresses not yet delivered that are aimed at the same host, but which have not
2770 been passed in this run of the transport. In this case, continue_more will be
2771 true, and all we should do is send RSET if necessary, and return, leaving the
2774 However, if no address was disposed of, i.e. all addresses got 4xx errors, we
2775 do not want to continue with other messages down the same channel, because that
2776 can lead to looping between two or more messages, all with the same,
2777 temporarily failing address(es). [The retry information isn't updated yet, so
2778 new processes keep on trying.] We probably also don't want to try more of this
2779 message's addresses either.
2781 If we have started a TLS session, we have to end it before passing the
2782 connection to a new process. However, not all servers can handle this (Exim
2783 can), so we do not pass such a connection on if the host matches
2784 hosts_nopass_tls. */
2787 debug_printf("ok=%d send_quit=%d send_rset=%d continue_more=%d "
2788 "yield=%d first_address is %sNULL\n", ok, send_quit, send_rset,
2789 continue_more, yield, (first_addr == NULL)? "":"not ");
2791 if (completed_address && ok && send_quit)
2794 smtp_compare_t t_compare;
2796 t_compare.tblock = tblock;
2797 t_compare.current_sender_address = sender_address;
2799 if ( first_addr != NULL
2801 || ( ( tls_out.active < 0
2802 || verify_check_given_host(&ob->hosts_nopass_tls, host) != OK
2805 transport_check_waiting(tblock->name, host->name,
2806 tblock->connection_max_messages, new_message_id, &more,
2807 (oicf)smtp_are_same_identities, (void*)&t_compare)
2815 if (! (ok = smtp_write_command(&outblock, FALSE, "RSET\r\n") >= 0))
2817 msg = US string_sprintf("send() to %s [%s] failed: %s", host->name,
2818 host->address, strerror(save_errno));
2821 else if (! (ok = smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
2822 ob->command_timeout)))
2825 send_quit = check_response(host, &errno, 0, buffer, &code, &msg,
2829 DEBUG(D_transport) debug_printf("H=%s [%s] %s\n",
2830 host->name, host->address, msg);
2835 /* Either RSET was not needed, or it succeeded */
2839 if (first_addr != NULL) /* More addresses still to be sent */
2840 { /* in this run of the transport */
2841 continue_sequence++; /* Causes * in logging */
2844 if (continue_more) return yield; /* More addresses for another run */
2846 /* Pass the socket to a new Exim process. Before doing so, we must shut
2847 down TLS. Not all MTAs allow for the continuation of the SMTP session
2848 when TLS is shut down. We test for this by sending a new EHLO. If we
2849 don't get a good response, we don't attempt to pass the socket on. */
2852 if (tls_out.active >= 0)
2854 tls_close(FALSE, TRUE);
2858 ok = smtp_write_command(&outblock,FALSE,"EHLO %s\r\n",helo_data) >= 0 &&
2859 smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
2860 ob->command_timeout);
2864 /* If the socket is successfully passed, we musn't send QUIT (or
2865 indeed anything!) from here. */
2867 /*XXX DSN_INFO: assume likely to do new HELO; but for greet we'll want to
2868 propagate it from the initial
2870 if (ok && transport_pass_socket(tblock->name, host->name, host->address,
2871 new_message_id, inblock.sock))
2877 /* If RSET failed and there are addresses left, they get deferred. */
2879 else set_errno(first_addr, errno, msg, DEFER, FALSE, host
2880 #ifdef EXPERIMENTAL_DSN_INFO
2881 , smtp_greeting, helo_response
2887 /* End off tidily with QUIT unless the connection has died or the socket has
2888 been passed to another process. There has been discussion on the net about what
2889 to do after sending QUIT. The wording of the RFC suggests that it is necessary
2890 to wait for a response, but on the other hand, there isn't anything one can do
2891 with an error response, other than log it. Exim used to do that. However,
2892 further discussion suggested that it is positively advantageous not to wait for
2893 the response, but to close the session immediately. This is supposed to move
2894 the TCP/IP TIME_WAIT state from the server to the client, thereby removing some
2895 load from the server. (Hosts that are both servers and clients may not see much
2896 difference, of course.) Further discussion indicated that this was safe to do
2897 on Unix systems which have decent implementations of TCP/IP that leave the
2898 connection around for a while (TIME_WAIT) after the application has gone away.
2899 This enables the response sent by the server to be properly ACKed rather than
2900 timed out, as can happen on broken TCP/IP implementations on other OS.
2902 This change is being made on 31-Jul-98. After over a year of trouble-free
2903 operation, the old commented-out code was removed on 17-Sep-99. */
2906 if (send_quit) (void)smtp_write_command(&outblock, FALSE, "QUIT\r\n");
2911 tls_close(FALSE, TRUE);
2914 /* Close the socket, and return the appropriate value, first setting
2915 works because the NULL setting is passed back to the calling process, and
2916 remote_max_parallel is forced to 1 when delivering over an existing connection,
2918 If all went well and continue_more is set, we shouldn't actually get here if
2919 there are further addresses, as the return above will be taken. However,
2920 writing RSET might have failed, or there may be other addresses whose hosts are
2921 specified in the transports, and therefore not visible at top level, in which
2922 case continue_more won't get set. */
2924 HDEBUG(D_transport|D_acl|D_v) debug_printf(" SMTP(close)>>\n");
2925 (void)close(inblock.sock);
2927 #ifndef DISABLE_EVENT
2928 (void) event_raise(tblock->event_action, US"tcp:close", NULL);
2931 continue_transport = NULL;
2932 continue_hostname = NULL;
2939 /*************************************************
2940 * Closedown entry point *
2941 *************************************************/
2943 /* This function is called when exim is passed an open smtp channel
2944 from another incarnation, but the message which it has been asked
2945 to deliver no longer exists. The channel is on stdin.
2947 We might do fancy things like looking for another message to send down
2948 the channel, but if the one we sought has gone, it has probably been
2949 delivered by some other process that itself will seek further messages,
2950 so just close down our connection.
2952 Argument: pointer to the transport instance block
2957 smtp_transport_closedown(transport_instance *tblock)
2959 smtp_transport_options_block *ob =
2960 (smtp_transport_options_block *)(tblock->options_block);
2961 smtp_inblock inblock;
2962 smtp_outblock outblock;
2964 uschar inbuffer[4096];
2965 uschar outbuffer[16];
2967 inblock.sock = fileno(stdin);
2968 inblock.buffer = inbuffer;
2969 inblock.buffersize = sizeof(inbuffer);
2970 inblock.ptr = inbuffer;
2971 inblock.ptrend = inbuffer;
2973 outblock.sock = inblock.sock;
2974 outblock.buffersize = sizeof(outbuffer);
2975 outblock.buffer = outbuffer;
2976 outblock.ptr = outbuffer;
2977 outblock.cmd_count = 0;
2978 outblock.authenticating = FALSE;
2980 (void)smtp_write_command(&outblock, FALSE, "QUIT\r\n");
2981 (void)smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
2982 ob->command_timeout);
2983 (void)close(inblock.sock);
2988 /*************************************************
2989 * Prepare addresses for delivery *
2990 *************************************************/
2992 /* This function is called to flush out error settings from previous delivery
2993 attempts to other hosts. It also records whether we got here via an MX record
2994 or not in the more_errno field of the address. We are interested only in
2995 addresses that are still marked DEFER - others may have got delivered to a
2996 previously considered IP address. Set their status to PENDING_DEFER to indicate
2997 which ones are relevant this time.
3000 addrlist the list of addresses
3001 host the host we are delivering to
3003 Returns: the first address for this delivery
3006 static address_item *
3007 prepare_addresses(address_item *addrlist, host_item *host)
3009 address_item *first_addr = NULL;
3011 for (addr = addrlist; addr != NULL; addr = addr->next)
3012 if (addr->transport_return == DEFER)
3014 if (first_addr == NULL) first_addr = addr;
3015 addr->transport_return = PENDING_DEFER;
3016 addr->basic_errno = 0;
3017 addr->more_errno = (host->mx >= 0)? 'M' : 'A';
3018 addr->message = NULL;
3020 addr->cipher = NULL;
3021 addr->ourcert = NULL;
3022 addr->peercert = NULL;
3023 addr->peerdn = NULL;
3024 addr->ocsp = OCSP_NOT_REQ;
3026 #ifdef EXPERIMENTAL_DSN_INFO
3027 addr->smtp_greeting = NULL;
3028 addr->helo_response = NULL;
3036 /*************************************************
3037 * Main entry point *
3038 *************************************************/
3040 /* See local README for interface details. As this is a remote transport, it is
3041 given a chain of addresses to be delivered in one connection, if possible. It
3042 always returns TRUE, indicating that each address has its own independent
3043 status set, except if there is a setting up problem, in which case it returns
3047 smtp_transport_entry(
3048 transport_instance *tblock, /* data for this instantiation */
3049 address_item *addrlist) /* addresses we are working on */
3053 int hosts_defer = 0;
3055 int hosts_looked_up = 0;
3056 int hosts_retry = 0;
3057 int hosts_serial = 0;
3058 int hosts_total = 0;
3059 int total_hosts_tried = 0;
3061 BOOL expired = TRUE;
3062 BOOL continuing = continue_hostname != NULL;
3063 uschar *expanded_hosts = NULL;
3065 uschar *tid = string_sprintf("%s transport", tblock->name);
3066 smtp_transport_options_block *ob =
3067 (smtp_transport_options_block *)(tblock->options_block);
3068 host_item *hostlist = addrlist->host_list;
3069 host_item *host = NULL;
3073 debug_printf("%s transport entered\n", tblock->name);
3074 for (addr = addrlist; addr != NULL; addr = addr->next)
3075 debug_printf(" %s\n", addr->address);
3076 if (continuing) debug_printf("already connected to %s [%s]\n",
3077 continue_hostname, continue_host_address);
3080 /* Set the flag requesting that these hosts be added to the waiting
3081 database if the delivery fails temporarily or if we are running with
3082 queue_smtp or a 2-stage queue run. This gets unset for certain
3083 kinds of error, typically those that are specific to the message. */
3085 update_waiting = TRUE;
3087 /* If a host list is not defined for the addresses - they must all have the
3088 same one in order to be passed to a single transport - or if the transport has
3089 a host list with hosts_override set, use the host list supplied with the
3090 transport. It is an error for this not to exist. */
3092 if (hostlist == NULL || (ob->hosts_override && ob->hosts != NULL))
3094 if (ob->hosts == NULL)
3096 addrlist->message = string_sprintf("%s transport called with no hosts set",
3098 addrlist->transport_return = PANIC;
3099 return FALSE; /* Only top address has status */
3102 DEBUG(D_transport) debug_printf("using the transport's hosts: %s\n",
3105 /* If the transport's host list contains no '$' characters, and we are not
3106 randomizing, it is fixed and therefore a chain of hosts can be built once
3107 and for all, and remembered for subsequent use by other calls to this
3108 transport. If, on the other hand, the host list does contain '$', or we are
3109 randomizing its order, we have to rebuild it each time. In the fixed case,
3110 as the hosts string will never be used again, it doesn't matter that we
3111 replace all the : characters with zeros. */
3113 if (ob->hostlist == NULL)
3115 uschar *s = ob->hosts;
3117 if (Ustrchr(s, '$') != NULL)
3119 if (!(expanded_hosts = expand_string(s)))
3121 addrlist->message = string_sprintf("failed to expand list of hosts "
3122 "\"%s\" in %s transport: %s", s, tblock->name, expand_string_message);
3123 addrlist->transport_return = search_find_defer? DEFER : PANIC;
3124 return FALSE; /* Only top address has status */
3126 DEBUG(D_transport) debug_printf("expanded list of hosts \"%s\" to "
3127 "\"%s\"\n", s, expanded_hosts);
3131 if (ob->hosts_randomize) s = expanded_hosts = string_copy(s);
3133 host_build_hostlist(&hostlist, s, ob->hosts_randomize);
3135 /* Check that the expansion yielded something useful. */
3136 if (hostlist == NULL)
3139 string_sprintf("%s transport has empty hosts setting", tblock->name);
3140 addrlist->transport_return = PANIC;
3141 return FALSE; /* Only top address has status */
3144 /* If there was no expansion of hosts, save the host list for
3147 if (!expanded_hosts) ob->hostlist = hostlist;
3150 /* This is not the first time this transport has been run in this delivery;
3151 the host list was built previously. */
3154 hostlist = ob->hostlist;
3157 /* The host list was supplied with the address. If hosts_randomize is set, we
3158 must sort it into a random order if it did not come from MX records and has not
3159 already been randomized (but don't bother if continuing down an existing
3162 else if (ob->hosts_randomize && hostlist->mx == MX_NONE && !continuing)
3164 host_item *newlist = NULL;
3165 while (hostlist != NULL)
3167 host_item *h = hostlist;
3168 hostlist = hostlist->next;
3170 h->sort_key = random_number(100);
3172 if (newlist == NULL)
3177 else if (h->sort_key < newlist->sort_key)
3184 host_item *hh = newlist;
3185 while (hh->next != NULL)
3187 if (h->sort_key < hh->next->sort_key) break;
3195 hostlist = addrlist->host_list = newlist;
3198 /* Sort out the default port. */
3200 if (!smtp_get_port(ob->port, addrlist, &port, tid)) return FALSE;
3202 /* For each host-plus-IP-address on the list:
3204 . If this is a continued delivery and the host isn't the one with the
3205 current connection, skip.
3207 . If the status is unusable (i.e. previously failed or retry checked), skip.
3209 . If no IP address set, get the address, either by turning the name into
3210 an address, calling gethostbyname if gethostbyname is on, or by calling
3211 the DNS. The DNS may yield multiple addresses, in which case insert the
3212 extra ones into the list.
3214 . Get the retry data if not previously obtained for this address and set the
3215 field which remembers the state of this address. Skip if the retry time is
3216 not reached. If not, remember whether retry data was found. The retry string
3217 contains both the name and the IP address.
3219 . Scan the list of addresses and mark those whose status is DEFER as
3220 PENDING_DEFER. These are the only ones that will be processed in this cycle
3223 . Make a delivery attempt - addresses marked PENDING_DEFER will be tried.
3224 Some addresses may be successfully delivered, others may fail, and yet
3225 others may get temporary errors and so get marked DEFER.
3227 . The return from the delivery attempt is OK if a connection was made and a
3228 valid SMTP dialogue was completed. Otherwise it is DEFER.
3230 . If OK, add a "remove" retry item for this host/IPaddress, if any.
3232 . If fail to connect, or other defer state, add a retry item.
3234 . If there are any addresses whose status is still DEFER, carry on to the
3235 next host/IPaddress, unless we have tried the number of hosts given
3236 by hosts_max_try or hosts_max_try_hardlimit; otherwise return. Note that
3237 there is some fancy logic for hosts_max_try that means its limit can be
3238 overstepped in some circumstances.
3240 If we get to the end of the list, all hosts have deferred at least one address,
3241 or not reached their retry times. If delay_after_cutoff is unset, it requests a
3242 delivery attempt to those hosts whose last try was before the arrival time of
3243 the current message. To cope with this, we have to go round the loop a second
3244 time. After that, set the status and error data for any addresses that haven't
3245 had it set already. */
3247 for (cutoff_retry = 0; expired &&
3248 cutoff_retry < ((ob->delay_after_cutoff)? 1 : 2);
3251 host_item *nexthost = NULL;
3252 int unexpired_hosts_tried = 0;
3254 for (host = hostlist;
3256 unexpired_hosts_tried < ob->hosts_max_try &&
3257 total_hosts_tried < ob->hosts_max_try_hardlimit;
3263 BOOL serialized = FALSE;
3264 BOOL host_is_expired = FALSE;
3265 BOOL message_defer = FALSE;
3266 BOOL some_deferred = FALSE;
3267 address_item *first_addr = NULL;
3268 uschar *interface = NULL;
3269 uschar *retry_host_key = NULL;
3270 uschar *retry_message_key = NULL;
3271 uschar *serialize_key = NULL;
3273 /* Default next host is next host. :-) But this can vary if the
3274 hosts_max_try limit is hit (see below). It may also be reset if a host
3275 address is looked up here (in case the host was multihomed). */
3277 nexthost = host->next;
3279 /* If the address hasn't yet been obtained from the host name, look it up
3280 now, unless the host is already marked as unusable. If it is marked as
3281 unusable, it means that the router was unable to find its IP address (in
3282 the DNS or wherever) OR we are in the 2nd time round the cutoff loop, and
3283 the lookup failed last time. We don't get this far if *all* MX records
3284 point to non-existent hosts; that is treated as a hard error.
3286 We can just skip this host entirely. When the hosts came from the router,
3287 the address will timeout based on the other host(s); when the address is
3288 looked up below, there is an explicit retry record added.
3290 Note that we mustn't skip unusable hosts if the address is not unset; they
3291 may be needed as expired hosts on the 2nd time round the cutoff loop. */
3293 if (host->address == NULL)
3295 int new_port, flags;
3298 if (host->status >= hstatus_unusable)
3300 DEBUG(D_transport) debug_printf("%s has no address and is unusable - skipping\n",
3305 DEBUG(D_transport) debug_printf("getting address for %s\n", host->name);
3307 /* The host name is permitted to have an attached port. Find it, and
3308 strip it from the name. Just remember it for now. */
3310 new_port = host_item_get_port(host);
3312 /* Count hosts looked up */
3316 /* Find by name if so configured, or if it's an IP address. We don't
3317 just copy the IP address, because we need the test-for-local to happen. */
3319 flags = HOST_FIND_BY_A;
3320 if (ob->dns_qualify_single) flags |= HOST_FIND_QUALIFY_SINGLE;
3321 if (ob->dns_search_parents) flags |= HOST_FIND_SEARCH_PARENTS;
3323 if (ob->gethostbyname || string_is_ip_address(host->name, NULL) != 0)
3324 rc = host_find_byname(host, NULL, flags, NULL, TRUE);
3326 rc = host_find_bydns(host, NULL, flags, NULL, NULL, NULL,
3327 &ob->dnssec, /* domains for request/require */
3330 /* Update the host (and any additional blocks, resulting from
3331 multihoming) with a host-specific port, if any. */
3333 for (hh = host; hh != nexthost; hh = hh->next) hh->port = new_port;
3335 /* Failure to find the host at this time (usually DNS temporary failure)
3336 is really a kind of routing failure rather than a transport failure.
3337 Therefore we add a retry item of the routing kind, not to stop us trying
3338 to look this name up here again, but to ensure the address gets timed
3339 out if the failures go on long enough. A complete failure at this point
3340 commonly points to a configuration error, but the best action is still
3341 to carry on for the next host. */
3343 if (rc == HOST_FIND_AGAIN || rc == HOST_FIND_FAILED)
3345 retry_add_item(addrlist, string_sprintf("R:%s", host->name), 0);
3347 if (rc == HOST_FIND_AGAIN) hosts_defer++; else hosts_fail++;
3348 DEBUG(D_transport) debug_printf("rc = %s for %s\n", (rc == HOST_FIND_AGAIN)?
3349 "HOST_FIND_AGAIN" : "HOST_FIND_FAILED", host->name);
3350 host->status = hstatus_unusable;
3352 for (addr = addrlist; addr != NULL; addr = addr->next)
3354 if (addr->transport_return != DEFER) continue;
3355 addr->basic_errno = ERRNO_UNKNOWNHOST;
3357 string_sprintf("failed to lookup IP address for %s", host->name);
3362 /* If the host is actually the local host, we may have a problem, or
3363 there may be some cunning configuration going on. In the problem case,
3364 log things and give up. The default transport status is already DEFER. */
3366 if (rc == HOST_FOUND_LOCAL && !ob->allow_localhost)
3368 for (addr = addrlist; addr != NULL; addr = addr->next)
3370 addr->basic_errno = 0;
3371 addr->message = string_sprintf("%s transport found host %s to be "
3372 "local", tblock->name, host->name);
3376 } /* End of block for IP address lookup */
3378 /* If this is a continued delivery, we are interested only in the host
3379 which matches the name of the existing open channel. The check is put
3380 here after the local host lookup, in case the name gets expanded as a
3381 result of the lookup. Set expired FALSE, to save the outer loop executing
3384 if (continuing && (Ustrcmp(continue_hostname, host->name) != 0 ||
3385 Ustrcmp(continue_host_address, host->address) != 0))
3388 continue; /* With next host */
3391 /* Reset the default next host in case a multihomed host whose addresses
3392 are not looked up till just above added to the host list. */
3394 nexthost = host->next;
3396 /* If queue_smtp is set (-odqs or the first part of a 2-stage run), or the
3397 domain is in queue_smtp_domains, we don't actually want to attempt any
3398 deliveries. When doing a queue run, queue_smtp_domains is always unset. If
3399 there is a lookup defer in queue_smtp_domains, proceed as if the domain
3400 were not in it. We don't want to hold up all SMTP deliveries! Except when
3401 doing a two-stage queue run, don't do this if forcing. */
3403 if ((!deliver_force || queue_2stage) && (queue_smtp ||
3404 match_isinlist(addrlist->domain,
3405 (const uschar **)&queue_smtp_domains, 0,
3406 &domainlist_anchor, NULL, MCL_DOMAIN, TRUE, NULL) == OK))
3409 for (addr = addrlist; addr != NULL; addr = addr->next)
3411 if (addr->transport_return != DEFER) continue;
3412 addr->message = US"domain matches queue_smtp_domains, or -odqs set";
3414 continue; /* With next host */
3417 /* Count hosts being considered - purely for an intelligent comment
3418 if none are usable. */
3422 /* Set $host and $host address now in case they are needed for the
3423 interface expansion or the serialize_hosts check; they remain set if an
3424 actual delivery happens. */
3426 deliver_host = host->name;
3427 deliver_host_address = host->address;
3428 lookup_dnssec_authenticated = host->dnssec == DS_YES ? US"yes"
3429 : host->dnssec == DS_NO ? US"no"
3432 /* Set up a string for adding to the retry key if the port number is not
3433 the standard SMTP port. A host may have its own port setting that overrides
3436 pistring = string_sprintf(":%d", (host->port == PORT_NONE)?
3438 if (Ustrcmp(pistring, ":25") == 0) pistring = US"";
3440 /* Select IPv4 or IPv6, and choose an outgoing interface. If the interface
3441 string is set, even if constant (as different transports can have different
3442 constant settings), we must add it to the key that is used for retries,
3443 because connections to the same host from a different interface should be
3444 treated separately. */
3446 host_af = (Ustrchr(host->address, ':') == NULL)? AF_INET : AF_INET6;
3447 if ((rs = ob->interface) && *rs)
3449 if (!smtp_get_interface(rs, host_af, addrlist, &interface, tid))
3451 pistring = string_sprintf("%s/%s", pistring, interface);
3454 /* The first time round the outer loop, check the status of the host by
3455 inspecting the retry data. The second time round, we are interested only
3456 in expired hosts that haven't been tried since this message arrived. */
3458 if (cutoff_retry == 0)
3461 /* Ensure the status of the address is set by checking retry data if
3462 necessary. There may be host-specific retry data (applicable to all
3463 messages) and also data for retries of a specific message at this host.
3464 If either of these retry records are actually read, the keys used are
3465 returned to save recomputing them later. */
3467 if (exp_bool(addrlist, US"transport", tblock->name, D_transport,
3468 US"retry_include_ip_address", ob->retry_include_ip_address,
3469 ob->expand_retry_include_ip_address, &incl_ip) != OK)
3470 continue; /* with next host */
3472 host_is_expired = retry_check_address(addrlist->domain, host, pistring,
3473 incl_ip, &retry_host_key, &retry_message_key);
3475 DEBUG(D_transport) debug_printf("%s [%s]%s status = %s\n", host->name,
3476 (host->address == NULL)? US"" : host->address, pistring,
3477 (host->status == hstatus_usable)? "usable" :
3478 (host->status == hstatus_unusable)? "unusable" :
3479 (host->status == hstatus_unusable_expired)? "unusable (expired)" : "?");
3481 /* Skip this address if not usable at this time, noting if it wasn't
3482 actually expired, both locally and in the address. */
3484 switch (host->status)
3486 case hstatus_unusable:
3488 setflag(addrlist, af_retry_skipped);
3491 case hstatus_unusable_expired:
3494 case hwhy_retry: hosts_retry++; break;
3495 case hwhy_failed: hosts_fail++; break;
3496 case hwhy_deferred: hosts_defer++; break;
3499 /* If there was a retry message key, implying that previously there
3500 was a message-specific defer, we don't want to update the list of
3501 messages waiting for these hosts. */
3503 if (retry_message_key != NULL) update_waiting = FALSE;
3504 continue; /* With the next host or IP address */
3508 /* Second time round the loop: if the address is set but expired, and
3509 the message is newer than the last try, let it through. */
3513 if (host->address == NULL ||
3514 host->status != hstatus_unusable_expired ||
3515 host->last_try > received_time)
3518 debug_printf("trying expired host %s [%s]%s\n",
3519 host->name, host->address, pistring);
3520 host_is_expired = TRUE;
3523 /* Setting "expired=FALSE" doesn't actually mean not all hosts are expired;
3524 it remains TRUE only if all hosts are expired and none are actually tried.
3529 /* If this host is listed as one to which access must be serialized,
3530 see if another Exim process has a connection to it, and if so, skip
3531 this host. If not, update the database to record our connection to it
3532 and remember this for later deletion. Do not do any of this if we are
3533 sending the message down a pre-existing connection. */
3536 verify_check_given_host(&ob->serialize_hosts, host) == OK)
3538 serialize_key = string_sprintf("host-serialize-%s", host->name);
3539 if (!enq_start(serialize_key, 1))
3542 debug_printf("skipping host %s because another Exim process "
3543 "is connected to it\n", host->name);
3550 /* OK, we have an IP address that is not waiting for its retry time to
3551 arrive (it might be expired) OR (second time round the loop) we have an
3552 expired host that hasn't been tried since the message arrived. Have a go
3553 at delivering the message to it. First prepare the addresses by flushing
3554 out the result of previous attempts, and finding the first address that
3555 is still to be delivered. */
3557 first_addr = prepare_addresses(addrlist, host);
3559 DEBUG(D_transport) debug_printf("delivering %s to %s [%s] (%s%s)\n",
3560 message_id, host->name, host->address, addrlist->address,
3561 (addrlist->next == NULL)? "" : ", ...");
3563 set_process_info("delivering %s to %s [%s] (%s%s)",
3564 message_id, host->name, host->address, addrlist->address,
3565 (addrlist->next == NULL)? "" : ", ...");
3567 /* This is not for real; don't do the delivery. If there are
3568 any remaining hosts, list them. */
3573 set_errno_nohost(addrlist, 0, NULL, OK, FALSE);
3574 for (addr = addrlist; addr != NULL; addr = addr->next)
3576 addr->host_used = host;
3577 addr->special_action = '*';
3578 addr->message = US"delivery bypassed by -N option";
3582 debug_printf("*** delivery by %s transport bypassed by -N option\n"
3583 "*** host and remaining hosts:\n", tblock->name);
3584 for (host2 = host; host2 != NULL; host2 = host2->next)
3585 debug_printf(" %s [%s]\n", host2->name,
3586 (host2->address == NULL)? US"unset" : host2->address);
3591 /* This is for real. If the host is expired, we don't count it for
3592 hosts_max_retry. This ensures that all hosts must expire before an address
3593 is timed out, unless hosts_max_try_hardlimit (which protects against
3594 lunatic DNS configurations) is reached.
3596 If the host is not expired and we are about to hit the hosts_max_retry
3597 limit, check to see if there is a subsequent hosts with a different MX
3598 value. If so, make that the next host, and don't count this one. This is a
3599 heuristic to make sure that different MXs do get tried. With a normal kind
3600 of retry rule, they would get tried anyway when the earlier hosts were
3601 delayed, but if the domain has a "retry every time" type of rule - as is
3602 often used for the the very large ISPs, that won't happen. */
3607 /* Make a copy of the host if it is local to this invocation
3608 of the transport. */
3612 thost = store_get(sizeof(host_item));
3614 thost->name = string_copy(host->name);
3615 thost->address = string_copy(host->address);
3620 if (!host_is_expired && ++unexpired_hosts_tried >= ob->hosts_max_try)
3624 debug_printf("hosts_max_try limit reached with this host\n");
3625 for (h = host; h; h = h->next) if (h->mx != host->mx)
3628 unexpired_hosts_tried--;
3629 DEBUG(D_transport) debug_printf("however, a higher MX host exists "
3630 "and will be tried\n");
3635 /* Attempt the delivery. */
3637 total_hosts_tried++;
3638 rc = smtp_deliver(addrlist, thost, host_af, port, interface, tblock,
3639 &message_defer, FALSE);
3642 OK => connection made, each address contains its result;
3643 message_defer is set for message-specific defers (when all
3644 recipients are marked defer)
3645 DEFER => there was a non-message-specific delivery problem;
3646 ERROR => there was a problem setting up the arguments for a filter,
3647 or there was a problem with expanding added headers
3650 /* If the result is not OK, there was a non-message-specific problem.
3651 If the result is DEFER, we need to write to the logs saying what happened
3652 for this particular host, except in the case of authentication and TLS
3653 failures, where the log has already been written. If all hosts defer a
3654 general message is written at the end. */
3656 if (rc == DEFER && first_addr->basic_errno != ERRNO_AUTHFAIL &&
3657 first_addr->basic_errno != ERRNO_TLSFAILURE)
3658 write_logs(first_addr, host);
3660 #ifndef DISABLE_EVENT
3662 deferred_event_raise(first_addr, host);
3665 /* If STARTTLS was accepted, but there was a failure in setting up the
3666 TLS session (usually a certificate screwup), and the host is not in
3667 hosts_require_tls, and tls_tempfail_tryclear is true, try again, with
3668 TLS forcibly turned off. We have to start from scratch with a new SMTP
3669 connection. That's why the retry is done from here, not from within
3670 smtp_deliver(). [Rejections of STARTTLS itself don't screw up the
3671 session, so the in-clear transmission after those errors, if permitted,
3672 happens inside smtp_deliver().] */
3676 && first_addr->basic_errno == ERRNO_TLSFAILURE
3677 && ob->tls_tempfail_tryclear
3678 && verify_check_given_host(&ob->hosts_require_tls, host) != OK
3681 log_write(0, LOG_MAIN, "TLS session failure: delivering unencrypted "
3682 "to %s [%s] (not in hosts_require_tls)", host->name, host->address);
3683 first_addr = prepare_addresses(addrlist, host);
3684 rc = smtp_deliver(addrlist, thost, host_af, port, interface, tblock,
3685 &message_defer, TRUE);
3686 if (rc == DEFER && first_addr->basic_errno != ERRNO_AUTHFAIL)
3687 write_logs(first_addr, host);
3688 # ifndef DISABLE_EVENT
3690 deferred_event_raise(first_addr, host);
3693 #endif /*SUPPORT_TLS*/
3696 /* Delivery attempt finished */
3698 rs = (rc == OK)? US"OK" : (rc == DEFER)? US"DEFER" : (rc == ERROR)?
3701 set_process_info("delivering %s: just tried %s [%s] for %s%s: result %s",
3702 message_id, host->name, host->address, addrlist->address,
3703 (addrlist->next == NULL)? "" : " (& others)", rs);
3705 /* Release serialization if set up */
3707 if (serialized) enq_end(serialize_key);
3709 /* If the result is DEFER, or if a host retry record is known to exist, we
3710 need to add an item to the retry chain for updating the retry database
3711 at the end of delivery. We only need to add the item to the top address,
3712 of course. Also, if DEFER, we mark the IP address unusable so as to skip it
3713 for any other delivery attempts using the same address. (It is copied into
3714 the unusable tree at the outer level, so even if different address blocks
3715 contain the same address, it still won't get tried again.) */
3717 if (rc == DEFER || retry_host_key != NULL)
3719 int delete_flag = (rc != DEFER)? rf_delete : 0;
3720 if (retry_host_key == NULL)
3723 if (exp_bool(addrlist, US"transport", tblock->name, D_transport,
3724 US"retry_include_ip_address", ob->retry_include_ip_address,
3725 ob->expand_retry_include_ip_address, &incl_ip) != OK)
3726 incl_ip = TRUE; /* error; use most-specific retry record */
3728 retry_host_key = incl_ip ?
3729 string_sprintf("T:%S:%s%s", host->name, host->address, pistring) :
3730 string_sprintf("T:%S%s", host->name, pistring);
3733 /* If a delivery of another message over an existing SMTP connection
3734 yields DEFER, we do NOT set up retry data for the host. This covers the
3735 case when there are delays in routing the addresses in the second message
3736 that are so long that the server times out. This is alleviated by not
3737 routing addresses that previously had routing defers when handling an
3738 existing connection, but even so, this case may occur (e.g. if a
3739 previously happily routed address starts giving routing defers). If the
3740 host is genuinely down, another non-continued message delivery will
3741 notice it soon enough. */
3743 if (delete_flag != 0 || !continuing)
3744 retry_add_item(first_addr, retry_host_key, rf_host | delete_flag);
3746 /* We may have tried an expired host, if its retry time has come; ensure
3747 the status reflects the expiry for the benefit of any other addresses. */
3751 host->status = (host_is_expired)?
3752 hstatus_unusable_expired : hstatus_unusable;
3753 host->why = hwhy_deferred;
3757 /* If message_defer is set (host was OK, but every recipient got deferred
3758 because of some message-specific problem), or if that had happened
3759 previously so that a message retry key exists, add an appropriate item
3760 to the retry chain. Note that if there was a message defer but now there is
3761 a host defer, the message defer record gets deleted. That seems perfectly
3762 reasonable. Also, stop the message from being remembered as waiting
3763 for specific hosts. */
3765 if (message_defer || retry_message_key != NULL)
3767 int delete_flag = message_defer? 0 : rf_delete;
3768 if (retry_message_key == NULL)
3771 if (exp_bool(addrlist, US"transport", tblock->name, D_transport,
3772 US"retry_include_ip_address", ob->retry_include_ip_address,
3773 ob->expand_retry_include_ip_address, &incl_ip) != OK)
3774 incl_ip = TRUE; /* error; use most-specific retry record */
3776 retry_message_key = incl_ip ?
3777 string_sprintf("T:%S:%s%s:%s", host->name, host->address, pistring,
3779 string_sprintf("T:%S%s:%s", host->name, pistring, message_id);
3781 retry_add_item(addrlist, retry_message_key,
3782 rf_message | rf_host | delete_flag);
3783 update_waiting = FALSE;
3786 /* Any return other than DEFER (that is, OK or ERROR) means that the
3787 addresses have got their final statuses filled in for this host. In the OK
3788 case, see if any of them are deferred. */
3791 for (addr = addrlist; addr; addr = addr->next)
3792 if (addr->transport_return == DEFER)
3794 some_deferred = TRUE;
3798 /* If no addresses deferred or the result was ERROR, return. We do this for
3799 ERROR because a failing filter set-up or add_headers expansion is likely to
3800 fail for any host we try. */
3802 if (rc == ERROR || (rc == OK && !some_deferred))
3804 DEBUG(D_transport) debug_printf("Leaving %s transport\n", tblock->name);
3805 return TRUE; /* Each address has its status */
3808 /* If the result was DEFER or some individual addresses deferred, let
3809 the loop run to try other hosts with the deferred addresses, except for the
3810 case when we were trying to deliver down an existing channel and failed.
3811 Don't try any other hosts in this case. */
3813 if (continuing) break;
3815 /* If the whole delivery, or some individual addresses, were deferred and
3816 there are more hosts that could be tried, do not count this host towards
3817 the hosts_max_try limit if the age of the message is greater than the
3818 maximum retry time for this host. This means we may try try all hosts,
3819 ignoring the limit, when messages have been around for some time. This is
3820 important because if we don't try all hosts, the address will never time
3821 out. NOTE: this does not apply to hosts_max_try_hardlimit. */
3823 if ((rc == DEFER || some_deferred) && nexthost != NULL)
3826 retry_config *retry = retry_find_config(host->name, NULL, 0, 0);
3828 if (retry != NULL && retry->rules != NULL)
3830 retry_rule *last_rule;
3831 for (last_rule = retry->rules;
3832 last_rule->next != NULL;
3833 last_rule = last_rule->next);
3834 timedout = time(NULL) - received_time > last_rule->timeout;
3836 else timedout = TRUE; /* No rule => timed out */
3840 unexpired_hosts_tried--;
3841 DEBUG(D_transport) debug_printf("temporary delivery error(s) override "
3842 "hosts_max_try (message older than host's retry time)\n");
3845 } /* End of loop for trying multiple hosts. */
3847 /* This is the end of the loop that repeats iff expired is TRUE and
3848 ob->delay_after_cutoff is FALSE. The second time round we will
3849 try those hosts that haven't been tried since the message arrived. */
3853 debug_printf("all IP addresses skipped or deferred at least one address\n");
3854 if (expired && !ob->delay_after_cutoff && cutoff_retry == 0)
3855 debug_printf("retrying IP addresses not tried since message arrived\n");
3860 /* Get here if all IP addresses are skipped or defer at least one address. In
3861 MUA wrapper mode, this will happen only for connection or other non-message-
3862 specific failures. Force the delivery status for all addresses to FAIL. */
3866 for (addr = addrlist; addr != NULL; addr = addr->next)
3867 addr->transport_return = FAIL;
3871 /* In the normal, non-wrapper case, add a standard message to each deferred
3872 address if there hasn't been an error, that is, if it hasn't actually been
3873 tried this time. The variable "expired" will be FALSE if any deliveries were
3874 actually tried, or if there was at least one host that was not expired. That
3875 is, it is TRUE only if no deliveries were tried and all hosts were expired. If
3876 a delivery has been tried, an error code will be set, and the failing of the
3877 message is handled by the retry code later.
3879 If queue_smtp is set, or this transport was called to send a subsequent message
3880 down an existing TCP/IP connection, and something caused the host not to be
3881 found, we end up here, but can detect these cases and handle them specially. */
3883 for (addr = addrlist; addr; addr = addr->next)
3885 /* If host is not NULL, it means that we stopped processing the host list
3886 because of hosts_max_try or hosts_max_try_hardlimit. In the former case, this
3887 means we need to behave as if some hosts were skipped because their retry
3888 time had not come. Specifically, this prevents the address from timing out.
3889 However, if we have hit hosts_max_try_hardlimit, we want to behave as if all
3890 hosts were tried. */
3893 if (total_hosts_tried >= ob->hosts_max_try_hardlimit)
3896 debug_printf("hosts_max_try_hardlimit reached: behave as if all "
3897 "hosts were tried\n");
3902 debug_printf("hosts_max_try limit caused some hosts to be skipped\n");
3903 setflag(addr, af_retry_skipped);
3906 if (queue_smtp) /* no deliveries attempted */
3908 addr->transport_return = DEFER;
3909 addr->basic_errno = 0;
3910 addr->message = US"SMTP delivery explicitly queued";
3913 else if ( addr->transport_return == DEFER
3914 && (addr->basic_errno == ERRNO_UNKNOWNERROR || addr->basic_errno == 0)
3918 addr->basic_errno = ERRNO_HRETRY;
3919 if (continue_hostname)
3920 addr->message = US"no host found for existing SMTP connection";
3923 setflag(addr, af_pass_message); /* This is not a security risk */
3924 addr->message = string_sprintf(
3925 "all hosts%s have been failing for a long time %s",
3926 addr->domain ? string_sprintf(" for '%s'", addr->domain) : US"",
3927 ob->delay_after_cutoff
3928 ? US"(and retry time not reached)"
3929 : US"and were last tried after this message arrived");
3931 /* If we are already using fallback hosts, or there are no fallback hosts
3932 defined, convert the result to FAIL to cause a bounce. */
3934 if (addr->host_list == addr->fallback_hosts || !addr->fallback_hosts)
3935 addr->transport_return = FAIL;
3940 if (hosts_retry == hosts_total)
3941 s = "retry time not reached for any host%s";
3942 else if (hosts_fail == hosts_total)
3943 s = "all host address lookups%s failed permanently";
3944 else if (hosts_defer == hosts_total)
3945 s = "all host address lookups%s failed temporarily";
3946 else if (hosts_serial == hosts_total)
3947 s = "connection limit reached for all hosts%s";
3948 else if (hosts_fail+hosts_defer == hosts_total)
3949 s = "all host address lookups%s failed";
3951 s = "some host address lookups failed and retry time "
3952 "not reached for other hosts or connection limit reached%s";
3954 addr->message = string_sprintf(s,
3955 addr->domain ? string_sprintf(" for '%s'", addr->domain) : US"");
3960 /* Update the database which keeps information about which messages are waiting
3961 for which hosts to become available. For some message-specific errors, the
3962 update_waiting flag is turned off because we don't want follow-on deliveries in
3963 those cases. If this transport instance is explicitly limited to one message
3964 per connection then follow-on deliveries are not possible and there's no need
3965 to create/update the per-transport wait-<transport_name> database. */
3967 if (update_waiting && tblock->connection_max_messages != 1)
3968 transport_update_waiting(hostlist, tblock->name);
3972 DEBUG(D_transport) debug_printf("Leaving %s transport\n", tblock->name);
3974 return TRUE; /* Each address has its status */
3979 /* End of transport/smtp.c */