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)
15 #define DELIVER_BUFFER_SIZE 4096
18 /* Options specific to the smtp transport. This transport also supports LMTP
19 over TCP/IP. The options must be in alphabetic order (note that "_" comes
20 before the lower case letters). Some live in the transport_instance block so as
21 to be publicly visible; these are flagged with opt_public. */
23 optionlist smtp_transport_options[] = {
24 { "*expand_multi_domain", opt_stringptr | opt_hidden | opt_public,
25 (void *)offsetof(transport_instance, expand_multi_domain) },
26 { "*expand_retry_include_ip_address", opt_stringptr | opt_hidden,
27 (void *)(offsetof(smtp_transport_options_block, expand_retry_include_ip_address)) },
29 { "address_retry_include_sender", opt_bool,
30 (void *)offsetof(smtp_transport_options_block, address_retry_include_sender) },
31 { "allow_localhost", opt_bool,
32 (void *)offsetof(smtp_transport_options_block, allow_localhost) },
33 { "authenticated_sender", opt_stringptr,
34 (void *)offsetof(smtp_transport_options_block, authenticated_sender) },
35 { "authenticated_sender_force", opt_bool,
36 (void *)offsetof(smtp_transport_options_block, authenticated_sender_force) },
37 { "command_timeout", opt_time,
38 (void *)offsetof(smtp_transport_options_block, command_timeout) },
39 { "connect_timeout", opt_time,
40 (void *)offsetof(smtp_transport_options_block, connect_timeout) },
41 { "connection_max_messages", opt_int | opt_public,
42 (void *)offsetof(transport_instance, connection_max_messages) },
43 { "data_timeout", opt_time,
44 (void *)offsetof(smtp_transport_options_block, data_timeout) },
45 { "delay_after_cutoff", opt_bool,
46 (void *)offsetof(smtp_transport_options_block, delay_after_cutoff) },
48 { "dkim_canon", opt_stringptr,
49 (void *)offsetof(smtp_transport_options_block, dkim.dkim_canon) },
50 { "dkim_domain", opt_stringptr,
51 (void *)offsetof(smtp_transport_options_block, dkim.dkim_domain) },
52 { "dkim_private_key", opt_stringptr,
53 (void *)offsetof(smtp_transport_options_block, dkim.dkim_private_key) },
54 { "dkim_selector", opt_stringptr,
55 (void *)offsetof(smtp_transport_options_block, dkim.dkim_selector) },
56 { "dkim_sign_headers", opt_stringptr,
57 (void *)offsetof(smtp_transport_options_block, dkim.dkim_sign_headers) },
58 { "dkim_strict", opt_stringptr,
59 (void *)offsetof(smtp_transport_options_block, dkim.dkim_strict) },
61 { "dns_qualify_single", opt_bool,
62 (void *)offsetof(smtp_transport_options_block, dns_qualify_single) },
63 { "dns_search_parents", opt_bool,
64 (void *)offsetof(smtp_transport_options_block, dns_search_parents) },
65 { "dnssec_request_domains", opt_stringptr,
66 (void *)offsetof(smtp_transport_options_block, dnssec.request) },
67 { "dnssec_require_domains", opt_stringptr,
68 (void *)offsetof(smtp_transport_options_block, dnssec.require) },
69 { "dscp", opt_stringptr,
70 (void *)offsetof(smtp_transport_options_block, dscp) },
71 { "fallback_hosts", opt_stringptr,
72 (void *)offsetof(smtp_transport_options_block, fallback_hosts) },
73 { "final_timeout", opt_time,
74 (void *)offsetof(smtp_transport_options_block, final_timeout) },
75 { "gethostbyname", opt_bool,
76 (void *)offsetof(smtp_transport_options_block, gethostbyname) },
77 { "helo_data", opt_stringptr,
78 (void *)offsetof(smtp_transport_options_block, helo_data) },
79 { "hosts", opt_stringptr,
80 (void *)offsetof(smtp_transport_options_block, hosts) },
81 { "hosts_avoid_esmtp", opt_stringptr,
82 (void *)offsetof(smtp_transport_options_block, hosts_avoid_esmtp) },
83 { "hosts_avoid_pipelining", opt_stringptr,
84 (void *)offsetof(smtp_transport_options_block, hosts_avoid_pipelining) },
86 { "hosts_avoid_tls", opt_stringptr,
87 (void *)offsetof(smtp_transport_options_block, hosts_avoid_tls) },
89 { "hosts_max_try", opt_int,
90 (void *)offsetof(smtp_transport_options_block, hosts_max_try) },
91 { "hosts_max_try_hardlimit", opt_int,
92 (void *)offsetof(smtp_transport_options_block, hosts_max_try_hardlimit) },
94 { "hosts_nopass_tls", opt_stringptr,
95 (void *)offsetof(smtp_transport_options_block, hosts_nopass_tls) },
97 { "hosts_override", opt_bool,
98 (void *)offsetof(smtp_transport_options_block, hosts_override) },
99 { "hosts_randomize", opt_bool,
100 (void *)offsetof(smtp_transport_options_block, hosts_randomize) },
101 #if defined(SUPPORT_TLS) && !defined(DISABLE_OCSP)
102 { "hosts_request_ocsp", opt_stringptr,
103 (void *)offsetof(smtp_transport_options_block, hosts_request_ocsp) },
105 { "hosts_require_auth", opt_stringptr,
106 (void *)offsetof(smtp_transport_options_block, hosts_require_auth) },
108 # ifdef EXPERIMENTAL_DANE
109 { "hosts_require_dane", opt_stringptr,
110 (void *)offsetof(smtp_transport_options_block, hosts_require_dane) },
112 # ifndef DISABLE_OCSP
113 { "hosts_require_ocsp", opt_stringptr,
114 (void *)offsetof(smtp_transport_options_block, hosts_require_ocsp) },
116 { "hosts_require_tls", opt_stringptr,
117 (void *)offsetof(smtp_transport_options_block, hosts_require_tls) },
119 { "hosts_try_auth", opt_stringptr,
120 (void *)offsetof(smtp_transport_options_block, hosts_try_auth) },
121 { "hosts_try_chunking", opt_stringptr,
122 (void *)offsetof(smtp_transport_options_block, hosts_try_chunking) },
123 #if defined(SUPPORT_TLS) && defined(EXPERIMENTAL_DANE)
124 { "hosts_try_dane", opt_stringptr,
125 (void *)offsetof(smtp_transport_options_block, hosts_try_dane) },
127 { "hosts_try_fastopen", opt_stringptr,
128 (void *)offsetof(smtp_transport_options_block, hosts_try_fastopen) },
130 { "hosts_try_prdr", opt_stringptr,
131 (void *)offsetof(smtp_transport_options_block, hosts_try_prdr) },
134 { "hosts_verify_avoid_tls", opt_stringptr,
135 (void *)offsetof(smtp_transport_options_block, hosts_verify_avoid_tls) },
137 { "interface", opt_stringptr,
138 (void *)offsetof(smtp_transport_options_block, interface) },
139 { "keepalive", opt_bool,
140 (void *)offsetof(smtp_transport_options_block, keepalive) },
141 { "lmtp_ignore_quota", opt_bool,
142 (void *)offsetof(smtp_transport_options_block, lmtp_ignore_quota) },
143 { "max_rcpt", opt_int | opt_public,
144 (void *)offsetof(transport_instance, max_addresses) },
145 { "multi_domain", opt_expand_bool | opt_public,
146 (void *)offsetof(transport_instance, multi_domain) },
147 { "port", opt_stringptr,
148 (void *)offsetof(smtp_transport_options_block, port) },
149 { "protocol", opt_stringptr,
150 (void *)offsetof(smtp_transport_options_block, protocol) },
151 { "retry_include_ip_address", opt_expand_bool,
152 (void *)offsetof(smtp_transport_options_block, retry_include_ip_address) },
153 { "serialize_hosts", opt_stringptr,
154 (void *)offsetof(smtp_transport_options_block, serialize_hosts) },
155 { "size_addition", opt_int,
156 (void *)offsetof(smtp_transport_options_block, size_addition) }
158 ,{ "socks_proxy", opt_stringptr,
159 (void *)offsetof(smtp_transport_options_block, socks_proxy) }
162 ,{ "tls_certificate", opt_stringptr,
163 (void *)offsetof(smtp_transport_options_block, tls_certificate) },
164 { "tls_crl", opt_stringptr,
165 (void *)offsetof(smtp_transport_options_block, tls_crl) },
166 { "tls_dh_min_bits", opt_int,
167 (void *)offsetof(smtp_transport_options_block, tls_dh_min_bits) },
168 { "tls_privatekey", opt_stringptr,
169 (void *)offsetof(smtp_transport_options_block, tls_privatekey) },
170 { "tls_require_ciphers", opt_stringptr,
171 (void *)offsetof(smtp_transport_options_block, tls_require_ciphers) },
172 { "tls_sni", opt_stringptr,
173 (void *)offsetof(smtp_transport_options_block, tls_sni) },
174 { "tls_tempfail_tryclear", opt_bool,
175 (void *)offsetof(smtp_transport_options_block, tls_tempfail_tryclear) },
176 { "tls_try_verify_hosts", opt_stringptr,
177 (void *)offsetof(smtp_transport_options_block, tls_try_verify_hosts) },
178 { "tls_verify_cert_hostnames", opt_stringptr,
179 (void *)offsetof(smtp_transport_options_block,tls_verify_cert_hostnames)},
180 { "tls_verify_certificates", opt_stringptr,
181 (void *)offsetof(smtp_transport_options_block, tls_verify_certificates) },
182 { "tls_verify_hosts", opt_stringptr,
183 (void *)offsetof(smtp_transport_options_block, tls_verify_hosts) }
187 /* Size of the options list. An extern variable has to be used so that its
188 address can appear in the tables drtables.c. */
190 int smtp_transport_options_count =
191 sizeof(smtp_transport_options)/sizeof(optionlist);
193 /* Default private options block for the smtp transport. */
195 smtp_transport_options_block smtp_transport_option_defaults = {
197 NULL, /* fallback_hosts */
199 NULL, /* fallback_hostlist */
200 NULL, /* authenticated_sender */
201 US"$primary_hostname", /* helo_data */
202 NULL, /* interface */
204 US"smtp", /* protocol */
206 NULL, /* serialize_hosts */
207 NULL, /* hosts_try_auth */
208 NULL, /* hosts_require_auth */
209 US"*", /* hosts_try_chunking */
210 #ifdef EXPERIMENTAL_DANE
211 NULL, /* hosts_try_dane */
212 NULL, /* hosts_require_dane */
214 NULL, /* hosts_try_fastopen */
216 US"*", /* hosts_try_prdr */
219 US"*", /* hosts_request_ocsp (except under DANE; tls_client_start()) */
220 NULL, /* hosts_require_ocsp */
222 NULL, /* hosts_require_tls */
223 NULL, /* hosts_avoid_tls */
224 NULL, /* hosts_verify_avoid_tls */
225 NULL, /* hosts_avoid_pipelining */
226 NULL, /* hosts_avoid_esmtp */
227 NULL, /* hosts_nopass_tls */
228 5*60, /* command_timeout */
229 5*60, /* connect_timeout; shorter system default overrides */
230 5*60, /* data timeout */
231 10*60, /* final timeout */
232 1024, /* size_addition */
233 5, /* hosts_max_try */
234 50, /* hosts_max_try_hardlimit */
235 TRUE, /* address_retry_include_sender */
236 FALSE, /* allow_localhost */
237 FALSE, /* authenticated_sender_force */
238 FALSE, /* gethostbyname */
239 TRUE, /* dns_qualify_single */
240 FALSE, /* dns_search_parents */
241 { NULL, NULL }, /* dnssec_domains {request,require} */
242 TRUE, /* delay_after_cutoff */
243 FALSE, /* hosts_override */
244 FALSE, /* hosts_randomize */
245 TRUE, /* keepalive */
246 FALSE, /* lmtp_ignore_quota */
247 NULL, /* expand_retry_include_ip_address */
248 TRUE /* retry_include_ip_address */
250 ,NULL /* socks_proxy */
253 ,NULL, /* tls_certificate */
255 NULL, /* tls_privatekey */
256 NULL, /* tls_require_ciphers */
258 US"system", /* tls_verify_certificates */
259 EXIM_CLIENT_DH_DEFAULT_MIN_BITS,
260 /* tls_dh_min_bits */
261 TRUE, /* tls_tempfail_tryclear */
262 NULL, /* tls_verify_hosts */
263 US"*", /* tls_try_verify_hosts */
264 US"*" /* tls_verify_cert_hostnames */
267 , {NULL, /* dkim_canon */
268 NULL, /* dkim_domain */
269 NULL, /* dkim_private_key */
270 NULL, /* dkim_selector */
271 NULL, /* dkim_sign_headers */
272 NULL, /* dkim_strict */
273 FALSE} /* dot_stuffed */
277 /* some DSN flags for use later */
279 static int rf_list[] = {rf_notify_never, rf_notify_success,
280 rf_notify_failure, rf_notify_delay };
282 static uschar *rf_names[] = { US"NEVER", US"SUCCESS", US"FAILURE", US"DELAY" };
288 static uschar *smtp_command; /* Points to last cmd for error messages */
289 static uschar *mail_command; /* Points to MAIL cmd for error messages */
290 static BOOL update_waiting; /* TRUE to update the "wait" database */
291 static BOOL pipelining_active; /* current transaction is in pipe mode */
294 /*************************************************
295 * Setup entry point *
296 *************************************************/
298 /* This function is called when the transport is about to be used,
299 but before running it in a sub-process. It is used for two things:
301 (1) To set the fallback host list in addresses, when delivering.
302 (2) To pass back the interface, port, protocol, and other options, for use
303 during callout verification.
306 tblock pointer to the transport instance block
307 addrlist list of addresses about to be transported
308 tf if not NULL, pointer to block in which to return options
309 uid the uid that will be set (not used)
310 gid the gid that will be set (not used)
311 errmsg place for error message (not used)
313 Returns: OK always (FAIL, DEFER not used)
317 smtp_transport_setup(transport_instance *tblock, address_item *addrlist,
318 transport_feedback *tf, uid_t uid, gid_t gid, uschar **errmsg)
320 smtp_transport_options_block *ob =
321 (smtp_transport_options_block *)(tblock->options_block);
323 errmsg = errmsg; /* Keep picky compilers happy */
327 /* Pass back options if required. This interface is getting very messy. */
331 tf->interface = ob->interface;
333 tf->protocol = ob->protocol;
334 tf->hosts = ob->hosts;
335 tf->hosts_override = ob->hosts_override;
336 tf->hosts_randomize = ob->hosts_randomize;
337 tf->gethostbyname = ob->gethostbyname;
338 tf->qualify_single = ob->dns_qualify_single;
339 tf->search_parents = ob->dns_search_parents;
340 tf->helo_data = ob->helo_data;
343 /* Set the fallback host list for all the addresses that don't have fallback
344 host lists, provided that the local host wasn't present in the original host
347 if (!testflag(addrlist, af_local_host_removed))
349 for (; addrlist != NULL; addrlist = addrlist->next)
350 if (addrlist->fallback_hosts == NULL)
351 addrlist->fallback_hosts = ob->fallback_hostlist;
359 /*************************************************
360 * Initialization entry point *
361 *************************************************/
363 /* Called for each instance, after its options have been read, to
364 enable consistency checks to be done, or anything else that needs
367 Argument: pointer to the transport instance block
372 smtp_transport_init(transport_instance *tblock)
374 smtp_transport_options_block *ob =
375 (smtp_transport_options_block *)(tblock->options_block);
377 /* Retry_use_local_part defaults FALSE if unset */
379 if (tblock->retry_use_local_part == TRUE_UNSET)
380 tblock->retry_use_local_part = FALSE;
382 /* Set the default port according to the protocol */
384 if (ob->port == NULL)
385 ob->port = (strcmpic(ob->protocol, US"lmtp") == 0)? US"lmtp" :
386 (strcmpic(ob->protocol, US"smtps") == 0)? US"smtps" : US"smtp";
388 /* Set up the setup entry point, to be called before subprocesses for this
391 tblock->setup = smtp_transport_setup;
393 /* Complain if any of the timeouts are zero. */
395 if (ob->command_timeout <= 0 || ob->data_timeout <= 0 ||
396 ob->final_timeout <= 0)
397 log_write(0, LOG_PANIC_DIE|LOG_CONFIG,
398 "command, data, or final timeout value is zero for %s transport",
401 /* If hosts_override is set and there are local hosts, set the global
402 flag that stops verify from showing router hosts. */
404 if (ob->hosts_override && ob->hosts != NULL) tblock->overrides_hosts = TRUE;
406 /* If there are any fallback hosts listed, build a chain of host items
407 for them, but do not do any lookups at this time. */
409 host_build_hostlist(&(ob->fallback_hostlist), ob->fallback_hosts, FALSE);
416 /*************************************************
417 * Set delivery info into all active addresses *
418 *************************************************/
420 /* Only addresses whose status is >= PENDING are relevant. A lesser
421 status means that an address is not currently being processed.
424 addrlist points to a chain of addresses
425 errno_value to put in each address's errno field
426 msg to put in each address's message field
427 rc to put in each address's transport_return field
428 pass_message if TRUE, set the "pass message" flag in the address
429 host if set, mark addrs as having used this host
430 smtp_greeting from peer
431 helo_response from peer
433 If errno_value has the special value ERRNO_CONNECTTIMEOUT, ETIMEDOUT is put in
434 the errno field, and RTEF_CTOUT is ORed into the more_errno field, to indicate
435 this particular type of timeout.
441 set_errno(address_item *addrlist, int errno_value, uschar *msg, int rc,
442 BOOL pass_message, host_item * host
443 #ifdef EXPERIMENTAL_DSN_INFO
444 , const uschar * smtp_greeting, const uschar * helo_response
450 if (errno_value == ERRNO_CONNECTTIMEOUT)
452 errno_value = ETIMEDOUT;
453 orvalue = RTEF_CTOUT;
455 for (addr = addrlist; addr; addr = addr->next)
456 if (addr->transport_return >= PENDING)
458 addr->basic_errno = errno_value;
459 addr->more_errno |= orvalue;
463 if (pass_message) setflag(addr, af_pass_message);
465 addr->transport_return = rc;
468 addr->host_used = host;
469 #ifdef EXPERIMENTAL_DSN_INFO
471 {uschar * s = Ustrchr(smtp_greeting, '\n'); if (s) *s = '\0';}
472 addr->smtp_greeting = smtp_greeting;
475 {uschar * s = Ustrchr(helo_response, '\n'); if (s) *s = '\0';}
476 addr->helo_response = helo_response;
483 set_errno_nohost(address_item *addrlist, int errno_value, uschar *msg, int rc,
486 set_errno(addrlist, errno_value, msg, rc, pass_message, NULL
487 #ifdef EXPERIMENTAL_DSN_INFO
494 /*************************************************
495 * Check an SMTP response *
496 *************************************************/
498 /* This function is given an errno code and the SMTP response buffer
499 to analyse, together with the host identification for generating messages. It
500 sets an appropriate message and puts the first digit of the response code into
501 the yield variable. If no response was actually read, a suitable digit is
505 host the current host, to get its name for messages
506 errno_value pointer to the errno value
507 more_errno from the top address for use with ERRNO_FILTER_FAIL
508 buffer the SMTP response buffer
509 yield where to put a one-digit SMTP response code
510 message where to put an errror message
511 pass_message set TRUE if message is an SMTP response
513 Returns: TRUE if an SMTP "QUIT" command should be sent, else FALSE
517 check_response(host_item *host, int *errno_value, int more_errno,
518 uschar *buffer, int *yield, uschar **message, BOOL *pass_message)
520 uschar * pl = pipelining_active ? US"pipelined " : US"";
522 *yield = '4'; /* Default setting is to give a temporary error */
524 /* Handle response timeout */
526 if (*errno_value == ETIMEDOUT)
528 *message = US string_sprintf("SMTP timeout after %s%s",
530 if (transport_count > 0)
531 *message = US string_sprintf("%s (%d bytes written)", *message,
536 /* Handle malformed SMTP response */
538 if (*errno_value == ERRNO_SMTPFORMAT)
540 const uschar *malfresp = string_printing(buffer);
541 while (isspace(*malfresp)) malfresp++;
542 *message = *malfresp == 0
543 ? string_sprintf("Malformed SMTP reply (an empty line) "
544 "in response to %s%s", pl, smtp_command)
545 : string_sprintf("Malformed SMTP reply in response to %s%s: %s",
546 pl, smtp_command, malfresp);
550 /* Handle a failed filter process error; can't send QUIT as we mustn't
553 if (*errno_value == ERRNO_FILTER_FAIL)
555 *message = US string_sprintf("transport filter process failed (%d)%s",
557 (more_errno == EX_EXECFAILED)? ": unable to execute command" : "");
561 /* Handle a failed add_headers expansion; can't send QUIT as we mustn't
564 if (*errno_value == ERRNO_CHHEADER_FAIL)
567 US string_sprintf("failed to expand headers_add or headers_remove: %s",
568 expand_string_message);
572 /* Handle failure to write a complete data block */
574 if (*errno_value == ERRNO_WRITEINCOMPLETE)
576 *message = US string_sprintf("failed to write a data block");
581 /* Handle lack of advertised SMTPUTF8, for international message */
582 if (*errno_value == ERRNO_UTF8_FWD)
584 *message = US string_sprintf("utf8 support required but not offered for forwarding");
585 DEBUG(D_deliver|D_transport) debug_printf("%s\n", *message);
590 /* Handle error responses from the remote mailer. */
594 const uschar *s = string_printing(buffer);
595 *message = US string_sprintf("SMTP error from remote mail server after %s%s: "
596 "%s", pl, smtp_command, s);
597 *pass_message = TRUE;
602 /* No data was read. If there is no errno, this must be the EOF (i.e.
603 connection closed) case, which causes deferral. An explicit connection reset
604 error has the same effect. Otherwise, put the host's identity in the message,
605 leaving the errno value to be interpreted as well. In all cases, we have to
606 assume the connection is now dead. */
608 if (*errno_value == 0 || *errno_value == ECONNRESET)
610 *errno_value = ERRNO_SMTPCLOSED;
611 *message = US string_sprintf("Remote host closed connection "
612 "in response to %s%s", pl, smtp_command);
614 else *message = US string_sprintf("%s [%s]", host->name, host->address);
621 /*************************************************
622 * Write error message to logs *
623 *************************************************/
625 /* This writes to the main log and to the message log.
628 addr the address item containing error information
629 host the current host
635 write_logs(address_item *addr, host_item *host)
637 uschar * message = LOGGING(outgoing_port)
638 ? string_sprintf("H=%s [%s]:%d", host->name, host->address,
639 host->port == PORT_NONE ? 25 : host->port)
640 : string_sprintf("H=%s [%s]", host->name, host->address);
644 message = string_sprintf("%s: %s", message, addr->message);
645 if (addr->basic_errno > 0)
646 message = string_sprintf("%s: %s", message, strerror(addr->basic_errno));
647 log_write(0, LOG_MAIN, "%s", message);
648 deliver_msglog("%s %s\n", tod_stamp(tod_log), message);
652 const uschar * s = exim_errstr(addr->basic_errno);
653 log_write(0, LOG_MAIN, "%s %s", message, s);
654 deliver_msglog("%s %s %s\n", tod_stamp(tod_log), message, s);
659 msglog_line(host_item * host, uschar * message)
661 deliver_msglog("%s H=%s [%s] %s\n", tod_stamp(tod_log),
662 host->name, host->address, message);
667 #ifndef DISABLE_EVENT
668 /*************************************************
669 * Post-defer action *
670 *************************************************/
672 /* This expands an arbitrary per-transport string.
673 It might, for example, be used to write to the database log.
676 addr the address item containing error information
677 host the current host
683 deferred_event_raise(address_item *addr, host_item *host)
685 uschar * action = addr->transport->event_action;
686 const uschar * save_domain;
692 save_domain = deliver_domain;
693 save_local = deliver_localpart;
695 /*XXX would ip & port already be set up? */
696 deliver_host_address = string_copy(host->address);
697 deliver_host_port = host->port == PORT_NONE ? 25 : host->port;
698 event_defer_errno = addr->basic_errno;
700 router_name = addr->router->name;
701 transport_name = addr->transport->name;
702 deliver_domain = addr->domain;
703 deliver_localpart = addr->local_part;
705 (void) event_raise(action, US"msg:host:defer",
707 ? addr->basic_errno > 0
708 ? string_sprintf("%s: %s", addr->message, strerror(addr->basic_errno))
709 : string_copy(addr->message)
710 : addr->basic_errno > 0
711 ? string_copy(US strerror(addr->basic_errno))
714 deliver_localpart = save_local;
715 deliver_domain = save_domain;
716 router_name = transport_name = NULL;
720 /*************************************************
721 * Synchronize SMTP responses *
722 *************************************************/
724 /* This function is called from smtp_deliver() to receive SMTP responses from
725 the server, and match them up with the commands to which they relate. When
726 PIPELINING is not in use, this function is called after every command, and is
727 therefore somewhat over-engineered, but it is simpler to use a single scheme
728 that works both with and without PIPELINING instead of having two separate sets
731 The set of commands that are buffered up with pipelining may start with MAIL
732 and may end with DATA; in between are RCPT commands that correspond to the
733 addresses whose status is PENDING_DEFER. All other commands (STARTTLS, AUTH,
734 etc.) are never buffered.
736 Errors after MAIL or DATA abort the whole process leaving the response in the
737 buffer. After MAIL, pending responses are flushed, and the original command is
738 re-instated in big_buffer for error messages. For RCPT commands, the remote is
739 permitted to reject some recipient addresses while accepting others. However
740 certain errors clearly abort the whole process. Set the value in
741 transport_return to PENDING_OK if the address is accepted. If there is a
742 subsequent general error, it will get reset accordingly. If not, it will get
743 converted to OK at the end.
746 addrlist the complete address list
747 include_affixes TRUE if affixes include in RCPT
748 sync_addr ptr to the ptr of the one to start scanning at (updated)
749 host the host we are connected to
750 count the number of responses to read
752 include_sender true if 4xx retry is to include the sender it its key
753 pending_MAIL true if the first response is for MAIL
754 pending_DATA 0 if last command sent was not DATA
755 +1 if previously had a good recipient
756 -1 if not previously had a good recipient
757 inblock incoming SMTP block
758 timeout timeout value
759 buffer buffer for reading response
760 buffsize size of buffer
762 Returns: 3 if at least one address had 2xx and one had 5xx
763 2 if at least one address had 5xx but none had 2xx
764 1 if at least one host had a 2xx response, but none had 5xx
765 0 no address had 2xx or 5xx but no errors (all 4xx, or just DATA)
766 -1 timeout while reading RCPT response
767 -2 I/O or other non-response error for RCPT
768 -3 DATA or MAIL failed - errno and buffer set
772 sync_responses(address_item *addrlist, BOOL include_affixes,
773 address_item **sync_addr, host_item *host, int count,
774 BOOL address_retry_include_sender, BOOL pending_MAIL,
775 int pending_DATA, smtp_inblock *inblock, int timeout, uschar *buffer,
778 address_item *addr = *sync_addr;
781 /* Handle the response for a MAIL command. On error, reinstate the original
782 command in big_buffer for error message use, and flush any further pending
783 responses before returning, except after I/O errors and timeouts. */
788 if (!smtp_read_response(inblock, buffer, buffsize, '2', timeout))
790 DEBUG(D_transport) debug_printf("bad response for MAIL\n");
791 Ustrcpy(big_buffer, mail_command); /* Fits, because it came from there! */
792 if (errno == 0 && buffer[0] != 0)
794 uschar flushbuffer[4096];
796 if (buffer[0] == '4')
798 save_errno = ERRNO_MAIL4XX;
799 addr->more_errno |= ((buffer[1] - '0')*10 + buffer[2] - '0') << 8;
803 if (!smtp_read_response(inblock, flushbuffer, sizeof(flushbuffer),
805 && (errno != 0 || flushbuffer[0] == 0))
811 if (pending_DATA) count--; /* Number of RCPT responses to come */
812 while (count-- > 0) /* Mark any pending addrs with the host used */
814 while (addr->transport_return != PENDING_DEFER) addr = addr->next;
815 addr->host_used = host;
822 if (pending_DATA) count--; /* Number of RCPT responses to come */
824 /* Read and handle the required number of RCPT responses, matching each one up
825 with an address by scanning for the next address whose status is PENDING_DEFER.
830 while (addr->transport_return != PENDING_DEFER) addr = addr->next;
832 /* The address was accepted */
833 addr->host_used = host;
835 if (smtp_read_response(inblock, buffer, buffsize, '2', timeout))
838 addr->transport_return = PENDING_OK;
840 /* If af_dr_retry_exists is set, there was a routing delay on this address;
841 ensure that any address-specific retry record is expunged. We do this both
842 for the basic key and for the version that also includes the sender. */
844 if (testflag(addr, af_dr_retry_exists))
846 uschar *altkey = string_sprintf("%s:<%s>", addr->address_retry_key,
848 retry_add_item(addr, altkey, rf_delete);
849 retry_add_item(addr, addr->address_retry_key, rf_delete);
853 /* Timeout while reading the response */
855 else if (errno == ETIMEDOUT)
857 uschar *message = string_sprintf("SMTP timeout after RCPT TO:<%s>",
858 transport_rcpt_address(addr, include_affixes));
859 set_errno_nohost(addrlist, ETIMEDOUT, message, DEFER, FALSE);
860 retry_add_item(addr, addr->address_retry_key, 0);
861 update_waiting = FALSE;
865 /* Handle other errors in obtaining an SMTP response by returning -1. This
866 will cause all the addresses to be deferred. Restore the SMTP command in
867 big_buffer for which we are checking the response, so the error message
870 else if (errno != 0 || buffer[0] == 0)
872 string_format(big_buffer, big_buffer_size, "RCPT TO:<%s>",
873 transport_rcpt_address(addr, include_affixes));
877 /* Handle SMTP permanent and temporary response codes. */
882 string_sprintf("SMTP error from remote mail server after RCPT TO:<%s>: "
883 "%s", transport_rcpt_address(addr, include_affixes),
884 string_printing(buffer));
885 setflag(addr, af_pass_message);
886 msglog_line(host, addr->message);
888 /* The response was 5xx */
890 if (buffer[0] == '5')
892 addr->transport_return = FAIL;
896 /* The response was 4xx */
900 addr->transport_return = DEFER;
901 addr->basic_errno = ERRNO_RCPT4XX;
902 addr->more_errno |= ((buffer[1] - '0')*10 + buffer[2] - '0') << 8;
904 #ifndef DISABLE_EVENT
905 event_defer_errno = addr->more_errno;
906 msg_event_raise(US"msg:rcpt:host:defer", addr);
909 /* Log temporary errors if there are more hosts to be tried.
910 If not, log this last one in the == line. */
913 log_write(0, LOG_MAIN, "H=%s [%s]: %s", host->name, host->address, addr->message);
915 #ifndef DISABLE_EVENT
917 msg_event_raise(US"msg:rcpt:defer", addr);
920 /* Do not put this message on the list of those waiting for specific
921 hosts, as otherwise it is likely to be tried too often. */
923 update_waiting = FALSE;
925 /* Add a retry item for the address so that it doesn't get tried again
926 too soon. If address_retry_include_sender is true, add the sender address
929 if (address_retry_include_sender)
931 uschar *altkey = string_sprintf("%s:<%s>", addr->address_retry_key,
933 retry_add_item(addr, altkey, 0);
935 else retry_add_item(addr, addr->address_retry_key, 0);
938 } /* Loop for next RCPT response */
940 /* Update where to start at for the next block of responses, unless we
941 have already handled all the addresses. */
943 if (addr != NULL) *sync_addr = addr->next;
945 /* Handle a response to DATA. If we have not had any good recipients, either
946 previously or in this block, the response is ignored. */
948 if (pending_DATA != 0 &&
949 !smtp_read_response(inblock, buffer, buffsize, '3', timeout))
954 if (pending_DATA > 0 || (yield & 1) != 0)
956 if (errno == 0 && buffer[0] == '4')
958 errno = ERRNO_DATA4XX;
959 addrlist->more_errno |= ((buffer[1] - '0')*10 + buffer[2] - '0') << 8;
963 (void)check_response(host, &errno, 0, buffer, &code, &msg, &pass_message);
964 DEBUG(D_transport) debug_printf("%s\nerror for DATA ignored: pipelining "
965 "is in use and there were no good recipients\n", msg);
968 /* All responses read and handled; MAIL (if present) received 2xx and DATA (if
969 present) received 3xx. If any RCPTs were handled and yielded anything other
970 than 4xx, yield will be set non-zero. */
977 /* Do the client side of smtp-level authentication */
980 buffer EHLO response from server (gets overwritten)
981 addrlist chain of potential addresses to deliver
982 host host to deliver to
984 ibp, obp comms channel control blocks
987 OK Success, or failed (but not required): global "smtp_authenticated" set
988 DEFER Failed authentication (and was required)
989 ERROR Internal problem
991 FAIL_SEND Failed communications - transmit
996 smtp_auth(uschar *buffer, unsigned bufsize, address_item *addrlist, host_item *host,
997 smtp_transport_options_block *ob, BOOL is_esmtp,
998 smtp_inblock *ibp, smtp_outblock *obp)
1001 uschar *fail_reason = US"server did not advertise AUTH support";
1003 smtp_authenticated = FALSE;
1004 client_authenticator = client_authenticated_id = client_authenticated_sender = NULL;
1005 require_auth = verify_check_given_host(&ob->hosts_require_auth, host);
1007 if (is_esmtp && !regex_AUTH) regex_AUTH =
1008 regex_must_compile(US"\\n250[\\s\\-]AUTH\\s+([\\-\\w\\s]+)(?:\\n|$)",
1011 if (is_esmtp && regex_match_and_setup(regex_AUTH, buffer, 0, -1))
1013 uschar *names = string_copyn(expand_nstring[1], expand_nlength[1]);
1014 expand_nmax = -1; /* reset */
1016 /* Must not do this check until after we have saved the result of the
1017 regex match above. */
1019 if (require_auth == OK ||
1020 verify_check_given_host(&ob->hosts_try_auth, host) == OK)
1023 fail_reason = US"no common mechanisms were found";
1025 DEBUG(D_transport) debug_printf("scanning authentication mechanisms\n");
1027 /* Scan the configured authenticators looking for one which is configured
1028 for use as a client, which is not suppressed by client_condition, and
1029 whose name matches an authentication mechanism supported by the server.
1030 If one is found, attempt to authenticate by calling its client function.
1033 for (au = auths; !smtp_authenticated && au != NULL; au = au->next)
1037 (au->client_condition != NULL &&
1038 !expand_check_condition(au->client_condition, au->name,
1039 US"client authenticator")))
1041 DEBUG(D_transport) debug_printf("skipping %s authenticator: %s\n",
1043 (au->client)? "client_condition is false" :
1044 "not configured as a client");
1048 /* Loop to scan supported server mechanisms */
1053 int len = Ustrlen(au->public_name);
1054 while (isspace(*p)) p++;
1056 if (strncmpic(au->public_name, p, len) != 0 ||
1057 (p[len] != 0 && !isspace(p[len])))
1059 while (*p != 0 && !isspace(*p)) p++;
1063 /* Found data for a listed mechanism. Call its client entry. Set
1064 a flag in the outblock so that data is overwritten after sending so
1065 that reflections don't show it. */
1067 fail_reason = US"authentication attempt(s) failed";
1068 obp->authenticating = TRUE;
1069 rc = (au->info->clientcode)(au, ibp, obp,
1070 ob->command_timeout, buffer, bufsize);
1071 obp->authenticating = FALSE;
1072 DEBUG(D_transport) debug_printf("%s authenticator yielded %d\n",
1075 /* A temporary authentication failure must hold up delivery to
1076 this host. After a permanent authentication failure, we carry on
1077 to try other authentication methods. If all fail hard, try to
1078 deliver the message unauthenticated unless require_auth was set. */
1083 smtp_authenticated = TRUE; /* stops the outer loop */
1084 client_authenticator = au->name;
1085 if (au->set_client_id != NULL)
1086 client_authenticated_id = expand_string(au->set_client_id);
1089 /* Failure after writing a command */
1094 /* Failure after reading a response */
1097 if (errno != 0 || buffer[0] != '5') return FAIL;
1098 log_write(0, LOG_MAIN, "%s authenticator failed H=%s [%s] %s",
1099 au->name, host->name, host->address, buffer);
1102 /* Failure by some other means. In effect, the authenticator
1103 decided it wasn't prepared to handle this case. Typically this
1104 is the result of "fail" in an expansion string. Do we need to
1105 log anything here? Feb 2006: a message is now put in the buffer
1106 if logging is required. */
1110 log_write(0, LOG_MAIN, "%s authenticator cancelled "
1111 "authentication H=%s [%s] %s", au->name, host->name,
1112 host->address, buffer);
1115 /* Internal problem, message in buffer. */
1118 set_errno_nohost(addrlist, ERRNO_AUTHPROB, string_copy(buffer),
1123 break; /* If not authenticated, try next authenticator */
1124 } /* Loop for scanning supported server mechanisms */
1125 } /* Loop for further authenticators */
1129 /* If we haven't authenticated, but are required to, give up. */
1131 if (require_auth == OK && !smtp_authenticated)
1133 set_errno_nohost(addrlist, ERRNO_AUTHFAIL,
1134 string_sprintf("authentication required but %s", fail_reason), DEFER,
1143 /* Construct AUTH appendix string for MAIL TO */
1146 buffer to build string
1147 addrlist chain of potential addresses to deliver
1148 ob transport options
1150 Globals smtp_authenticated
1151 client_authenticated_sender
1152 Return True on error, otherwise buffer has (possibly empty) terminated string
1156 smtp_mail_auth_str(uschar *buffer, unsigned bufsize, address_item *addrlist,
1157 smtp_transport_options_block *ob)
1159 uschar *local_authenticated_sender = authenticated_sender;
1162 debug_printf("smtp_mail_auth_str: as<%s> os<%s> SA<%s>\n", authenticated_sender, ob->authenticated_sender, smtp_authenticated?"Y":"N");
1165 if (ob->authenticated_sender != NULL)
1167 uschar *new = expand_string(ob->authenticated_sender);
1170 if (!expand_string_forcedfail)
1172 uschar *message = string_sprintf("failed to expand "
1173 "authenticated_sender: %s", expand_string_message);
1174 set_errno_nohost(addrlist, ERRNO_EXPANDFAIL, message, DEFER, FALSE);
1178 else if (new[0] != 0) local_authenticated_sender = new;
1181 /* Add the authenticated sender address if present */
1183 if ((smtp_authenticated || ob->authenticated_sender_force) &&
1184 local_authenticated_sender != NULL)
1186 string_format(buffer, bufsize, " AUTH=%s",
1187 auth_xtextencode(local_authenticated_sender,
1188 Ustrlen(local_authenticated_sender)));
1189 client_authenticated_sender = string_copy(local_authenticated_sender);
1199 #ifdef EXPERIMENTAL_DANE
1200 /* Lookup TLSA record for host/port.
1201 Return: OK success with dnssec; DANE mode
1202 DEFER Do not use this host now, may retry later
1203 FAIL_FORCED No TLSA record; DANE not usable
1204 FAIL Do not use this connection
1208 tlsa_lookup(const host_item * host, dns_answer * dnsa, BOOL dane_required)
1210 /* move this out to host.c given the similarity to dns_lookup() ? */
1212 const uschar * fullname = buffer;
1214 /* TLSA lookup string */
1215 (void)sprintf(CS buffer, "_%d._tcp.%.256s", host->port, host->name);
1217 switch (dns_lookup(dnsa, buffer, T_TLSA, &fullname))
1220 if (!dns_is_secure(dnsa))
1222 log_write(0, LOG_MAIN, "DANE error: TLSA lookup not DNSSEC");
1228 return DEFER; /* just defer this TLS'd conn */
1230 case DNS_NODATA: /* no TLSA RR for this lookup */
1231 case DNS_NOMATCH: /* no records at all for this lookup */
1232 return dane_required ? FAIL : FAIL_FORCED;
1236 return dane_required ? FAIL : DEFER;
1243 typedef struct smtp_compare_s
1245 uschar *current_sender_address;
1246 struct transport_instance *tblock;
1250 Create a unique string that identifies this message, it is based on
1251 sender_address, helo_data and tls_certificate if enabled. */
1254 smtp_local_identity(uschar * sender, struct transport_instance * tblock)
1256 address_item * addr1;
1257 uschar * if1 = US"";
1258 uschar * helo1 = US"";
1260 uschar * tlsc1 = US"";
1262 uschar * save_sender_address = sender_address;
1263 uschar * local_identity = NULL;
1264 smtp_transport_options_block * ob =
1265 (smtp_transport_options_block *)tblock->options_block;
1267 sender_address = sender;
1269 addr1 = deliver_make_addr (sender, TRUE);
1270 deliver_set_expansions(addr1);
1273 if1 = expand_string(ob->interface);
1276 helo1 = expand_string(ob->helo_data);
1279 if (ob->tls_certificate)
1280 tlsc1 = expand_string(ob->tls_certificate);
1281 local_identity = string_sprintf ("%s^%s^%s", if1, helo1, tlsc1);
1283 local_identity = string_sprintf ("%s^%s", if1, helo1);
1286 deliver_set_expansions(NULL);
1287 sender_address = save_sender_address;
1289 return local_identity;
1294 /* This routine is a callback that is called from transport_check_waiting.
1295 This function will evaluate the incoming message versus the previous
1296 message. If the incoming message is using a different local identity then
1297 we will veto this new message. */
1300 smtp_are_same_identities(uschar * message_id, smtp_compare_t * s_compare)
1302 uschar * message_local_identity,
1303 * current_local_identity,
1304 * new_sender_address;
1306 current_local_identity =
1307 smtp_local_identity(s_compare->current_sender_address, s_compare->tblock);
1309 if (!(new_sender_address = deliver_get_sender_address(message_id)))
1312 message_local_identity =
1313 smtp_local_identity(new_sender_address, s_compare->tblock);
1315 return Ustrcmp(current_local_identity, message_local_identity) == 0;
1321 ehlo_response(uschar * buf, size_t bsize, uschar checks)
1324 if ( checks & PEER_OFFERED_TLS
1325 && pcre_exec(regex_STARTTLS, NULL, CS buf, bsize, 0, PCRE_EOPT, NULL, 0) < 0)
1326 checks &= ~PEER_OFFERED_TLS;
1329 if ( checks & PEER_OFFERED_IGNQ
1330 && pcre_exec(regex_IGNOREQUOTA, NULL, CS buf, bsize, 0,
1331 PCRE_EOPT, NULL, 0) < 0)
1332 checks &= ~PEER_OFFERED_IGNQ;
1334 if ( checks & PEER_OFFERED_CHUNKING
1335 && pcre_exec(regex_CHUNKING, NULL, CS buf, bsize, 0, PCRE_EOPT, NULL, 0) < 0)
1336 checks &= ~PEER_OFFERED_CHUNKING;
1338 #ifndef DISABLE_PRDR
1339 if ( checks & PEER_OFFERED_PRDR
1340 && pcre_exec(regex_PRDR, NULL, CS buf, bsize, 0, PCRE_EOPT, NULL, 0) < 0)
1341 checks &= ~PEER_OFFERED_PRDR;
1345 if ( checks & PEER_OFFERED_UTF8
1346 && pcre_exec(regex_UTF8, NULL, CS buf, bsize, 0, PCRE_EOPT, NULL, 0) < 0)
1347 checks &= ~PEER_OFFERED_UTF8;
1350 if ( checks & PEER_OFFERED_DSN
1351 && pcre_exec(regex_DSN, NULL, CS buf, bsize, 0, PCRE_EOPT, NULL, 0) < 0)
1352 checks &= ~PEER_OFFERED_DSN;
1354 if ( checks & PEER_OFFERED_PIPE
1355 && pcre_exec(regex_PIPELINING, NULL, CS buf, bsize, 0,
1356 PCRE_EOPT, NULL, 0) < 0)
1357 checks &= ~PEER_OFFERED_PIPE;
1359 if ( checks & PEER_OFFERED_SIZE
1360 && pcre_exec(regex_SIZE, NULL, CS buf, bsize, 0, PCRE_EOPT, NULL, 0) < 0)
1361 checks &= ~PEER_OFFERED_SIZE;
1368 /* Callback for emitting a BDAT data chunk header.
1370 If given a nonzero size, first flush any buffered SMTP commands
1371 then emit the command.
1373 Reap previous SMTP command responses if requested.
1374 Reap one SMTP command response if requested.
1376 Returns: OK or ERROR
1380 smtp_chunk_cmd_callback(int fd, transport_ctx * tctx,
1381 unsigned chunk_size, unsigned flags)
1383 smtp_transport_options_block * ob =
1384 (smtp_transport_options_block *)(tctx->tblock->options_block);
1387 uschar * buffer = tctx->buffer;
1390 /* Write SMTP chunk header command */
1393 if((cmd_count = smtp_write_command(tctx->outblock, FALSE, "BDAT %u%s\r\n",
1395 flags & tc_chunk_last ? " LAST" : "")
1396 ) < 0) return ERROR;
1398 prev_cmd_count = cmd_count += tctx->cmd_count;
1400 /* Reap responses for any previous, but not one we just emitted */
1404 if (tctx->pending_BDAT)
1407 if (flags & tc_reap_prev && prev_cmd_count > 0)
1409 DEBUG(D_transport) debug_printf("look for %d responses"
1410 " for previous pipelined cmds\n", prev_cmd_count);
1412 switch(sync_responses(tctx->first_addr, tctx->tblock->rcpt_include_affixes,
1413 tctx->sync_addr, tctx->host, prev_cmd_count,
1414 ob->address_retry_include_sender,
1415 tctx->pending_MAIL, 0,
1417 ob->command_timeout,
1418 buffer, DELIVER_BUFFER_SIZE))
1420 case 1: /* 2xx (only) => OK */
1421 case 3: tctx->good_RCPT = TRUE; /* 2xx & 5xx => OK & progress made */
1422 case 2: *tctx->completed_address = TRUE; /* 5xx (only) => progress made */
1423 case 0: break; /* No 2xx or 5xx, but no probs */
1425 case -1: /* Timeout on RCPT */
1426 default: return ERROR; /* I/O error, or any MAIL/DATA error */
1429 if (!tctx->pending_BDAT)
1430 pipelining_active = FALSE;
1433 /* Reap response for an outstanding BDAT */
1435 if (tctx->pending_BDAT)
1437 DEBUG(D_transport) debug_printf("look for one response for BDAT\n");
1439 if (!smtp_read_response(tctx->inblock, buffer, DELIVER_BUFFER_SIZE, '2',
1440 ob->command_timeout))
1442 if (errno == 0 && buffer[0] == '4')
1444 errno = ERRNO_DATA4XX; /*XXX does this actually get used? */
1445 tctx->first_addr->more_errno |=
1446 ((buffer[1] - '0')*10 + buffer[2] - '0') << 8;
1451 tctx->pending_BDAT = FALSE;
1452 pipelining_active = FALSE;
1454 else if (chunk_size > 0)
1455 tctx->pending_BDAT = TRUE;
1458 tctx->cmd_count = cmd_count;
1464 /*************************************************
1465 * Deliver address list to given host *
1466 *************************************************/
1468 /* If continue_hostname is not null, we get here only when continuing to
1469 deliver down an existing channel. The channel was passed as the standard
1470 input. TLS is never active on a passed channel; the previous process always
1471 closes it down before passing the connection on.
1473 Otherwise, we have to make a connection to the remote host, and do the
1474 initial protocol exchange.
1476 When running as an MUA wrapper, if the sender or any recipient is rejected,
1477 temporarily or permanently, we force failure for all recipients.
1480 addrlist chain of potential addresses to deliver; only those whose
1481 transport_return field is set to PENDING_DEFER are currently
1482 being processed; others should be skipped - they have either
1483 been delivered to an earlier host or IP address, or been
1484 failed by one of them.
1485 host host to deliver to
1486 host_af AF_INET or AF_INET6
1487 port default TCP/IP port to use, in host byte order
1488 interface interface to bind to, or NULL
1489 tblock transport instance block
1490 message_defer set TRUE if yield is OK, but all addresses were deferred
1491 because of a non-recipient, non-host failure, that is, a
1492 4xx response to MAIL FROM, DATA, or ".". This is a defer
1493 that is specific to the message.
1494 suppress_tls if TRUE, don't attempt a TLS connection - this is set for
1495 a second attempt after TLS initialization fails
1497 Returns: OK - the connection was made and the delivery attempted;
1498 the result for each address is in its data block.
1499 DEFER - the connection could not be made, or something failed
1500 while setting up the SMTP session, or there was a
1501 non-message-specific error, such as a timeout.
1502 ERROR - a filter command is specified for this transport,
1503 and there was a problem setting it up; OR helo_data
1504 or add_headers or authenticated_sender is specified
1505 for this transport, and the string failed to expand
1509 smtp_deliver(address_item *addrlist, host_item *host, int host_af, int port,
1510 uschar *interface, transport_instance *tblock,
1511 BOOL *message_defer, BOOL suppress_tls)
1514 address_item *sync_addr;
1515 address_item *first_addr = addrlist;
1520 time_t start_delivery_time = time(NULL);
1521 smtp_transport_options_block *ob =
1522 (smtp_transport_options_block *)(tblock->options_block);
1532 BOOL pending_MAIL:1;
1533 #ifndef DISABLE_PRDR
1539 BOOL dsn_all_lasthop:1;
1540 #if defined(SUPPORT_TLS) && defined(EXPERIMENTAL_DANE)
1542 BOOL dane_required:1;
1546 BOOL pass_message = FALSE;
1547 BOOL completed_address = FALSE;
1548 uschar peer_offered = 0;
1549 #if defined(SUPPORT_TLS) && defined(EXPERIMENTAL_DANE)
1550 dns_answer tlsa_dnsa;
1552 smtp_inblock inblock;
1553 smtp_outblock outblock;
1554 int max_rcpt = tblock->max_addresses;
1555 uschar *igquotstr = US"";
1557 #ifdef EXPERIMENTAL_DSN_INFO
1558 uschar *smtp_greeting = NULL;
1559 uschar *helo_response = NULL;
1561 uschar *helo_data = NULL;
1563 uschar *message = NULL;
1564 uschar new_message_id[MESSAGE_ID_LENGTH + 1];
1566 uschar buffer[DELIVER_BUFFER_SIZE];
1567 uschar inbuffer[4096];
1568 uschar outbuffer[4096];
1570 suppress_tls = suppress_tls; /* stop compiler warning when no TLS support */
1572 lflags.lmtp = strcmpic(ob->protocol, US"lmtp") == 0;
1573 lflags.smtps = strcmpic(ob->protocol, US"smtps") == 0;
1575 lflags.send_rset = TRUE;
1576 lflags.send_quit = TRUE;
1577 lflags.setting_up = TRUE;
1578 lflags.esmtp = TRUE;
1579 lflags.esmtp_sent = FALSE;
1581 lflags.utf8_needed = FALSE;
1583 lflags.dsn_all_lasthop = TRUE;
1584 #if defined(SUPPORT_TLS) && defined(EXPERIMENTAL_DANE)
1585 lflags.dane = FALSE;
1586 lflags.dane_required = verify_check_given_host(&ob->hosts_require_dane, host) == OK;
1589 *message_defer = FALSE;
1590 smtp_command = US"initial connection";
1592 if (max_rcpt == 0) max_rcpt = 999999;
1594 /* Set up the buffer for reading SMTP response packets. */
1596 inblock.buffer = inbuffer;
1597 inblock.buffersize = sizeof(inbuffer);
1598 inblock.ptr = inbuffer;
1599 inblock.ptrend = inbuffer;
1601 /* Set up the buffer for holding SMTP commands while pipelining */
1603 outblock.buffer = outbuffer;
1604 outblock.buffersize = sizeof(outbuffer);
1605 outblock.ptr = outbuffer;
1606 outblock.cmd_count = 0;
1607 outblock.authenticating = FALSE;
1609 /* Reset the parameters of a TLS session. */
1612 tls_out.cipher = NULL; /* the one we may use for this transport */
1613 tls_out.ourcert = NULL;
1614 tls_out.peercert = NULL;
1615 tls_out.peerdn = NULL;
1616 #if defined(SUPPORT_TLS) && !defined(USE_GNUTLS)
1619 tls_out.ocsp = OCSP_NOT_REQ;
1621 /* Flip the legacy TLS-related variables over to the outbound set in case
1622 they're used in the context of the transport. Don't bother resetting
1623 afterward as we're in a subprocess. */
1625 tls_modify_variables(&tls_out);
1630 set_errno_nohost(addrlist, ERRNO_TLSFAILURE, US"TLS support not available",
1636 /* Make a connection to the host if this isn't a continued delivery, and handle
1637 the initial interaction and HELO/EHLO/LHLO. Connect timeout errors are handled
1638 specially so they can be identified for retries. */
1640 if (continue_hostname == NULL)
1642 /* This puts port into host->port */
1643 inblock.sock = outblock.sock =
1644 smtp_connect(host, host_af, port, interface, ob->connect_timeout, tblock);
1646 if (inblock.sock < 0)
1648 set_errno_nohost(addrlist, errno == ETIMEDOUT ? ERRNO_CONNECTTIMEOUT : errno,
1649 NULL, DEFER, FALSE);
1653 #if defined(SUPPORT_TLS) && defined(EXPERIMENTAL_DANE)
1655 tls_out.dane_verified = FALSE;
1656 tls_out.tlsa_usage = 0;
1658 if (host->dnssec == DS_YES)
1660 if( lflags.dane_required
1661 || verify_check_given_host(&ob->hosts_try_dane, host) == OK
1663 switch (rc = tlsa_lookup(host, &tlsa_dnsa, lflags.dane_required))
1665 case OK: lflags.dane = TRUE; break;
1666 case FAIL_FORCED: break;
1667 default: set_errno_nohost(addrlist, ERRNO_DNSDEFER,
1668 string_sprintf("DANE error: tlsa lookup %s",
1669 rc == DEFER ? "DEFER" : "FAIL"),
1674 else if (lflags.dane_required)
1676 set_errno_nohost(addrlist, ERRNO_DNSDEFER,
1677 string_sprintf("DANE error: %s lookup not DNSSEC", host->name),
1683 ob->tls_tempfail_tryclear = FALSE;
1687 /* Expand the greeting message while waiting for the initial response. (Makes
1688 sense if helo_data contains ${lookup dnsdb ...} stuff). The expansion is
1689 delayed till here so that $sending_interface and $sending_port are set. */
1691 helo_data = expand_string(ob->helo_data);
1695 uschar * errstr = NULL;
1696 if ((helo_data = string_domain_utf8_to_alabel(helo_data, &errstr)), errstr)
1698 errstr = string_sprintf("failed to expand helo_data: %s", errstr);
1699 set_errno_nohost(addrlist, ERRNO_EXPANDFAIL, errstr, DEFER, FALSE);
1706 /* The first thing is to wait for an initial OK response. The dreaded "goto"
1707 is nevertheless a reasonably clean way of programming this kind of logic,
1708 where you want to escape on any error. */
1715 (void) setsockopt(inblock.sock, IPPROTO_TCP, TCP_QUICKACK, US &off, sizeof(off));
1717 good_response = smtp_read_response(&inblock, buffer, sizeof(buffer),
1718 '2', ob->command_timeout);
1719 #ifdef EXPERIMENTAL_DSN_INFO
1720 smtp_greeting = string_copy(buffer);
1722 if (!good_response) goto RESPONSE_FAILED;
1724 #ifndef DISABLE_EVENT
1727 lookup_dnssec_authenticated = host->dnssec==DS_YES ? US"yes"
1728 : host->dnssec==DS_NO ? US"no" : NULL;
1729 s = event_raise(tblock->event_action, US"smtp:connect", buffer);
1732 set_errno_nohost(addrlist, ERRNO_EXPANDFAIL,
1733 string_sprintf("deferred by smtp:connect event expansion: %s", s),
1741 /* Now check if the helo_data expansion went well, and sign off cleanly if
1746 uschar *message = string_sprintf("failed to expand helo_data: %s",
1747 expand_string_message);
1748 set_errno_nohost(addrlist, ERRNO_EXPANDFAIL, message, DEFER, FALSE);
1754 /** Debugging without sending a message
1755 addrlist->transport_return = DEFER;
1759 /* Errors that occur after this point follow an SMTP command, which is
1760 left in big_buffer by smtp_write_command() for use in error messages. */
1762 smtp_command = big_buffer;
1764 /* Tell the remote who we are...
1766 February 1998: A convention has evolved that ESMTP-speaking MTAs include the
1767 string "ESMTP" in their greeting lines, so make Exim send EHLO if the
1768 greeting is of this form. The assumption was that the far end supports it
1769 properly... but experience shows that there are some that give 5xx responses,
1770 even though the banner includes "ESMTP" (there's a bloody-minded one that
1771 says "ESMTP not spoken here"). Cope with that case.
1773 September 2000: Time has passed, and it seems reasonable now to always send
1774 EHLO at the start. It is also convenient to make the change while installing
1777 July 2003: Joachim Wieland met a broken server that advertises "PIPELINING"
1778 but times out after sending MAIL FROM, RCPT TO and DATA all together. There
1779 would be no way to send out the mails, so there is now a host list
1780 "hosts_avoid_esmtp" that disables ESMTP for special hosts and solves the
1781 PIPELINING problem as well. Maybe it can also be useful to cure other
1782 problems with broken servers.
1784 Exim originally sent "Helo" at this point and ran for nearly a year that way.
1785 Then somebody tried it with a Microsoft mailer... It seems that all other
1786 mailers use upper case for some reason (the RFC is quite clear about case
1787 independence) so, for peace of mind, I gave in. */
1789 lflags.esmtp = verify_check_given_host(&ob->hosts_avoid_esmtp, host) != OK;
1791 /* Alas; be careful, since this goto is not an error-out, so conceivably
1792 we might set data between here and the target which we assume to exist
1793 and be usable. I can see this coming back to bite us. */
1797 smtp_peer_options |= PEER_OFFERED_TLS;
1798 suppress_tls = FALSE;
1799 ob->tls_tempfail_tryclear = FALSE;
1800 smtp_command = US"SSL-on-connect";
1807 if (smtp_write_command(&outblock, FALSE, "%s %s\r\n",
1808 lflags.lmtp ? "LHLO" : "EHLO", helo_data) < 0)
1810 lflags.esmtp_sent = TRUE;
1811 if (!smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
1812 ob->command_timeout))
1814 if (errno != 0 || buffer[0] == 0 || lflags.lmtp)
1816 #ifdef EXPERIMENTAL_DSN_INFO
1817 helo_response = string_copy(buffer);
1819 goto RESPONSE_FAILED;
1821 lflags.esmtp = FALSE;
1823 #ifdef EXPERIMENTAL_DSN_INFO
1824 helo_response = string_copy(buffer);
1829 debug_printf("not sending EHLO (host matches hosts_avoid_esmtp)\n");
1834 int n = sizeof(buffer);
1835 uschar * rsp = buffer;
1837 if (lflags.esmtp_sent && (n = Ustrlen(buffer)) < sizeof(buffer)/2)
1838 { rsp = buffer + n + 1; n = sizeof(buffer) - n; }
1840 if (smtp_write_command(&outblock, FALSE, "HELO %s\r\n", helo_data) < 0)
1842 good_response = smtp_read_response(&inblock, rsp, n,
1843 '2', ob->command_timeout);
1844 #ifdef EXPERIMENTAL_DSN_INFO
1845 helo_response = string_copy(rsp);
1849 /* Handle special logging for a closed connection after HELO
1850 when had previously sent EHLO */
1852 if (rsp != buffer && rsp[0] == 0 && (errno == 0 || errno == ECONNRESET))
1855 lflags.send_quit = FALSE;
1856 save_errno = ERRNO_SMTPCLOSED;
1857 message = string_sprintf("Remote host closed connection "
1858 "in response to %s (EHLO response was: %s)",
1859 smtp_command, buffer);
1862 Ustrncpy(buffer, rsp, sizeof(buffer)/2);
1863 goto RESPONSE_FAILED;
1867 peer_offered = smtp_peer_options = 0;
1869 if (lflags.esmtp || lflags.lmtp)
1871 peer_offered = ehlo_response(buffer, Ustrlen(buffer),
1872 PEER_OFFERED_TLS /* others checked later */
1875 /* Set tls_offered if the response to EHLO specifies support for STARTTLS. */
1878 smtp_peer_options |= peer_offered & PEER_OFFERED_TLS;
1883 /* For continuing deliveries down the same channel, the socket is the standard
1884 input, and we don't need to redo EHLO here (but may need to do so for TLS - see
1885 below). Set up the pointer to where subsequent commands will be left, for
1886 error messages. Note that smtp_peer_options will have been
1887 set from the command line if they were set in the process that passed the
1890 /*XXX continue case needs to propagate DSN_INFO, prob. in deliver.c
1891 as the contine goes via transport_pass_socket() and doublefork and exec.
1892 It does not wait. Unclear how we keep separate host's responses
1893 separate - we could match up by host ip+port as a bodge. */
1897 inblock.sock = outblock.sock = fileno(stdin);
1898 smtp_command = big_buffer;
1899 host->port = port; /* Record the port that was used */
1902 /* If TLS is available on this connection, whether continued or not, attempt to
1903 start up a TLS session, unless the host is in hosts_avoid_tls. If successful,
1904 send another EHLO - the server may give a different answer in secure mode. We
1905 use a separate buffer for reading the response to STARTTLS so that if it is
1906 negative, the original EHLO data is available for subsequent analysis, should
1907 the client not be required to use TLS. If the response is bad, copy the buffer
1908 for error analysis. */
1911 if ( smtp_peer_options & PEER_OFFERED_TLS
1913 && verify_check_given_host(&ob->hosts_avoid_tls, host) != OK)
1915 uschar buffer2[4096];
1916 if (smtp_write_command(&outblock, FALSE, "STARTTLS\r\n") < 0)
1919 /* If there is an I/O error, transmission of this message is deferred. If
1920 there is a temporary rejection of STARRTLS and tls_tempfail_tryclear is
1921 false, we also defer. However, if there is a temporary rejection of STARTTLS
1922 and tls_tempfail_tryclear is true, or if there is an outright rejection of
1923 STARTTLS, we carry on. This means we will try to send the message in clear,
1924 unless the host is in hosts_require_tls (tested below). */
1926 if (!smtp_read_response(&inblock, buffer2, sizeof(buffer2), '2',
1927 ob->command_timeout))
1931 || (buffer2[0] == '4' && !ob->tls_tempfail_tryclear)
1934 Ustrncpy(buffer, buffer2, sizeof(buffer));
1935 goto RESPONSE_FAILED;
1939 /* STARTTLS accepted: try to negotiate a TLS session. */
1944 int rc = tls_client_start(inblock.sock, host, addrlist, tblock
1945 # ifdef EXPERIMENTAL_DANE
1946 , lflags.dane ? &tlsa_dnsa : NULL
1950 /* TLS negotiation failed; give an error. From outside, this function may
1951 be called again to try in clear on a new connection, if the options permit
1952 it for this host. */
1956 # ifdef EXPERIMENTAL_DANE
1957 if (lflags.dane) log_write(0, LOG_MAIN,
1958 "DANE attempt failed; no TLS connection to %s [%s]",
1959 host->name, host->address);
1962 save_errno = ERRNO_TLSFAILURE;
1963 message = US"failure while setting up TLS session";
1964 lflags.send_quit = FALSE;
1968 /* TLS session is set up */
1970 smtp_peer_options_wrap = smtp_peer_options;
1971 for (addr = addrlist; addr; addr = addr->next)
1972 if (addr->transport_return == PENDING_DEFER)
1974 addr->cipher = tls_out.cipher;
1975 addr->ourcert = tls_out.ourcert;
1976 addr->peercert = tls_out.peercert;
1977 addr->peerdn = tls_out.peerdn;
1978 addr->ocsp = tls_out.ocsp;
1983 /* if smtps, we'll have smtp_command set to something else; always safe to
1985 smtp_command = big_buffer;
1987 /* If we started TLS, redo the EHLO/LHLO exchange over the secure channel. If
1988 helo_data is null, we are dealing with a connection that was passed from
1989 another process, and so we won't have expanded helo_data above. We have to
1990 expand it here. $sending_ip_address and $sending_port are set up right at the
1991 start of the Exim process (in exim.c). */
1993 if (tls_out.active >= 0)
1998 if (helo_data == NULL)
2000 helo_data = expand_string(ob->helo_data);
2001 if (helo_data == NULL)
2003 uschar *message = string_sprintf("failed to expand helo_data: %s",
2004 expand_string_message);
2005 set_errno_nohost(addrlist, ERRNO_EXPANDFAIL, message, DEFER, FALSE);
2011 /* For SMTPS we need to wait for the initial OK response. */
2014 good_response = smtp_read_response(&inblock, buffer, sizeof(buffer),
2015 '2', ob->command_timeout);
2016 #ifdef EXPERIMENTAL_DSN_INFO
2017 smtp_greeting = string_copy(buffer);
2019 if (!good_response) goto RESPONSE_FAILED;
2023 greeting_cmd = "EHLO";
2026 greeting_cmd = "HELO";
2028 debug_printf("not sending EHLO (host matches hosts_avoid_esmtp)\n");
2031 if (smtp_write_command(&outblock, FALSE, "%s %s\r\n",
2032 lflags.lmtp ? "LHLO" : greeting_cmd, helo_data) < 0)
2034 good_response = smtp_read_response(&inblock, buffer, sizeof(buffer),
2035 '2', ob->command_timeout);
2036 #ifdef EXPERIMENTAL_DSN_INFO
2037 helo_response = string_copy(buffer);
2039 if (!good_response) goto RESPONSE_FAILED;
2040 smtp_peer_options = 0;
2043 /* If the host is required to use a secure channel, ensure that we
2046 else if ( lflags.smtps
2047 # ifdef EXPERIMENTAL_DANE
2050 || verify_check_given_host(&ob->hosts_require_tls, host) == OK
2053 save_errno = ERRNO_TLSREQUIRED;
2054 message = string_sprintf("a TLS session is required, but %s",
2055 smtp_peer_options & PEER_OFFERED_TLS
2056 ? "an attempt to start TLS failed" : "the server did not offer TLS support");
2059 #endif /*SUPPORT_TLS*/
2061 /* If TLS is active, we have just started it up and re-done the EHLO command,
2062 so its response needs to be analyzed. If TLS is not active and this is a
2063 continued session down a previously-used socket, we haven't just done EHLO, so
2066 if (continue_hostname == NULL
2068 || tls_out.active >= 0
2072 if (lflags.esmtp || lflags.lmtp)
2074 peer_offered = ehlo_response(buffer, Ustrlen(buffer),
2076 | (lflags.lmtp && ob->lmtp_ignore_quota ? PEER_OFFERED_IGNQ : 0)
2077 | PEER_OFFERED_CHUNKING
2080 | (addrlist->prop.utf8_msg ? PEER_OFFERED_UTF8 : 0)
2081 /*XXX if we hand peercaps on to continued-conn processes,
2082 must not depend on this addr */
2086 | (ob->size_addition >= 0 ? PEER_OFFERED_SIZE : 0)
2089 /* Set for IGNOREQUOTA if the response to LHLO specifies support and the
2090 lmtp_ignore_quota option was set. */
2092 igquotstr = peer_offered & PEER_OFFERED_IGNQ ? US" IGNOREQUOTA" : US"";
2094 /* If the response to EHLO specified support for the SIZE parameter, note
2095 this, provided size_addition is non-negative. */
2097 smtp_peer_options |= peer_offered & PEER_OFFERED_SIZE;
2099 /* Note whether the server supports PIPELINING. If hosts_avoid_esmtp matched
2100 the current host, esmtp will be false, so PIPELINING can never be used. If
2101 the current host matches hosts_avoid_pipelining, don't do it. */
2103 if ( peer_offered & PEER_OFFERED_PIPE
2104 && verify_check_given_host(&ob->hosts_avoid_pipelining, host) != OK)
2105 smtp_peer_options |= PEER_OFFERED_PIPE;
2107 DEBUG(D_transport) debug_printf("%susing PIPELINING\n",
2108 smtp_peer_options & PEER_OFFERED_PIPE ? "" : "not ");
2110 if ( peer_offered & PEER_OFFERED_CHUNKING
2111 && verify_check_given_host(&ob->hosts_try_chunking, host) != OK)
2112 peer_offered &= ~PEER_OFFERED_CHUNKING;
2114 if (peer_offered & PEER_OFFERED_CHUNKING)
2115 {DEBUG(D_transport) debug_printf("CHUNKING usable\n");}
2117 #ifndef DISABLE_PRDR
2118 if ( peer_offered & PEER_OFFERED_PRDR
2119 && verify_check_given_host(&ob->hosts_try_prdr, host) != OK)
2120 peer_offered &= ~PEER_OFFERED_PRDR;
2122 if (peer_offered & PEER_OFFERED_PRDR)
2123 {DEBUG(D_transport) debug_printf("PRDR usable\n");}
2126 /* Note if the server supports DSN */
2127 smtp_peer_options |= peer_offered & PEER_OFFERED_DSN;
2128 DEBUG(D_transport) debug_printf("%susing DSN\n",
2129 peer_offered & PEER_OFFERED_DSN ? "" : "not ");
2131 /* Note if the response to EHLO specifies support for the AUTH extension.
2132 If it has, check that this host is one we want to authenticate to, and do
2133 the business. The host name and address must be available when the
2134 authenticator's client driver is running. */
2136 switch (yield = smtp_auth(buffer, sizeof(buffer), addrlist, host,
2137 ob, lflags.esmtp, &inblock, &outblock))
2139 default: goto SEND_QUIT;
2141 case FAIL_SEND: goto SEND_FAILED;
2142 case FAIL: goto RESPONSE_FAILED;
2146 pipelining_active = !!(smtp_peer_options & PEER_OFFERED_PIPE);
2148 /* The setting up of the SMTP call is now complete. Any subsequent errors are
2149 message-specific. */
2151 lflags.setting_up = FALSE;
2154 if (addrlist->prop.utf8_msg)
2156 lflags.utf8_needed = !addrlist->prop.utf8_downcvt
2157 && !addrlist->prop.utf8_downcvt_maybe;
2158 DEBUG(D_transport) if (!lflags.utf8_needed)
2159 debug_printf("utf8: %s downconvert\n",
2160 addrlist->prop.utf8_downcvt ? "mandatory" : "optional");
2163 /* If this is an international message we need the host to speak SMTPUTF8 */
2164 if (lflags.utf8_needed && !(peer_offered & PEER_OFFERED_UTF8))
2166 errno = ERRNO_UTF8_FWD;
2167 goto RESPONSE_FAILED;
2171 /* If there is a filter command specified for this transport, we can now
2172 set it up. This cannot be done until the identify of the host is known. */
2174 if (tblock->filter_command != NULL)
2178 sprintf(CS fbuf, "%.50s transport", tblock->name);
2179 rc = transport_set_up_command(&transport_filter_argv, tblock->filter_command,
2180 TRUE, DEFER, addrlist, fbuf, NULL);
2181 transport_filter_timeout = tblock->filter_timeout;
2183 /* On failure, copy the error to all addresses, abandon the SMTP call, and
2188 set_errno_nohost(addrlist->next, addrlist->basic_errno, addrlist->message, DEFER,
2194 if ( transport_filter_argv
2195 && *transport_filter_argv
2196 && **transport_filter_argv
2197 && peer_offered & PEER_OFFERED_CHUNKING
2200 peer_offered &= ~PEER_OFFERED_CHUNKING;
2201 DEBUG(D_transport) debug_printf("CHUNKING not usable due to transport filter\n");
2206 /* For messages that have more than the maximum number of envelope recipients,
2207 we want to send several transactions down the same SMTP connection. (See
2208 comments in deliver.c as to how this reconciles, heuristically, with
2209 remote_max_parallel.) This optimization was added to Exim after the following
2210 code was already working. The simplest way to put it in without disturbing the
2211 code was to use a goto to jump back to this point when there is another
2212 transaction to handle. */
2215 sync_addr = first_addr;
2218 lflags.send_rset = TRUE;
2219 completed_address = FALSE;
2222 /* Initiate a message transfer. If we know the receiving MTA supports the SIZE
2223 qualification, send it, adding something to the message size to allow for
2224 imprecision and things that get added en route. Exim keeps the number of lines
2225 in a message, so we can give an accurate value for the original message, but we
2226 need some additional to handle added headers. (Double "." characters don't get
2227 included in the count.) */
2232 if (peer_offered & PEER_OFFERED_SIZE)
2234 sprintf(CS p, " SIZE=%d", message_size+message_linecount+ob->size_addition);
2238 #ifndef DISABLE_PRDR
2239 lflags.prdr_active = FALSE;
2240 if (peer_offered & PEER_OFFERED_PRDR)
2241 for (addr = first_addr; addr; addr = addr->next)
2242 if (addr->transport_return == PENDING_DEFER)
2244 for (addr = addr->next; addr; addr = addr->next)
2245 if (addr->transport_return == PENDING_DEFER)
2246 { /* at least two recipients to send */
2247 lflags.prdr_active = TRUE;
2248 sprintf(CS p, " PRDR"); p += 5;
2256 if ( addrlist->prop.utf8_msg
2257 && !addrlist->prop.utf8_downcvt
2258 && peer_offered & PEER_OFFERED_UTF8
2260 sprintf(CS p, " SMTPUTF8"), p += 9;
2263 /* check if all addresses have lasthop flag */
2264 /* do not send RET and ENVID if true */
2265 for (lflags.dsn_all_lasthop = TRUE, addr = first_addr;
2266 address_count < max_rcpt && addr != NULL;
2268 if ((addr->dsn_flags & rf_dsnlasthop) != 1)
2270 lflags.dsn_all_lasthop = FALSE;
2274 /* Add any DSN flags to the mail command */
2276 if (peer_offered & PEER_OFFERED_DSN && !lflags.dsn_all_lasthop)
2278 if (dsn_ret == dsn_ret_hdrs)
2279 { Ustrcpy(p, " RET=HDRS"); p += 9; }
2280 else if (dsn_ret == dsn_ret_full)
2281 { Ustrcpy(p, " RET=FULL"); p += 9; }
2285 string_format(p, sizeof(buffer) - (p-buffer), " ENVID=%s", dsn_envid);
2290 /* If an authenticated_sender override has been specified for this transport
2291 instance, expand it. If the expansion is forced to fail, and there was already
2292 an authenticated_sender for this message, the original value will be used.
2293 Other expansion failures are serious. An empty result is ignored, but there is
2294 otherwise no check - this feature is expected to be used with LMTP and other
2295 cases where non-standard addresses (e.g. without domains) might be required. */
2297 if (smtp_mail_auth_str(p, sizeof(buffer) - (p-buffer), addrlist, ob))
2303 /* From here until we send the DATA command, we can make use of PIPELINING
2304 if the server host supports it. The code has to be able to check the responses
2305 at any point, for when the buffer fills up, so we write it totally generally.
2306 When PIPELINING is off, each command written reports that it has flushed the
2309 lflags.pending_MAIL = TRUE; /* The block starts with MAIL */
2312 uschar * s = return_path;
2314 uschar * errstr = NULL;
2316 /* If we must downconvert, do the from-address here. Remember we had to
2317 for the to-addresses (done below), and also (ugly) for re-doing when building
2318 the delivery log line. */
2320 if ( addrlist->prop.utf8_msg
2321 && (addrlist->prop.utf8_downcvt || !(peer_offered & PEER_OFFERED_UTF8))
2324 if (s = string_address_utf8_to_alabel(return_path, &errstr), errstr)
2326 set_errno_nohost(addrlist, ERRNO_EXPANDFAIL, errstr, DEFER, FALSE);
2330 setflag(addrlist, af_utf8_downcvt);
2334 rc = smtp_write_command(&outblock, pipelining_active,
2335 "MAIL FROM:<%s>%s\r\n", s, buffer);
2338 mail_command = string_copy(big_buffer); /* Save for later error message */
2342 case -1: /* Transmission error */
2345 case +1: /* Block was sent */
2346 if (!smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
2347 ob->command_timeout))
2349 if (errno == 0 && buffer[0] == '4')
2351 errno = ERRNO_MAIL4XX;
2352 addrlist->more_errno |= ((buffer[1] - '0')*10 + buffer[2] - '0') << 8;
2354 goto RESPONSE_FAILED;
2356 lflags.pending_MAIL = FALSE;
2360 /* Pass over all the relevant recipient addresses for this host, which are the
2361 ones that have status PENDING_DEFER. If we are using PIPELINING, we can send
2362 several before we have to read the responses for those seen so far. This
2363 checking is done by a subroutine because it also needs to be done at the end.
2364 Send only up to max_rcpt addresses at a time, leaving first_addr pointing to
2365 the next one if not all are sent.
2367 In the MUA wrapper situation, we want to flush the PIPELINING buffer for the
2368 last address because we want to abort if any recipients have any kind of
2369 problem, temporary or permanent. We know that all recipient addresses will have
2370 the PENDING_DEFER status, because only one attempt is ever made, and we know
2371 that max_rcpt will be large, so all addresses will be done at once. */
2373 for (addr = first_addr;
2374 addr && address_count < max_rcpt;
2376 if (addr->transport_return == PENDING_DEFER)
2382 addr->dsn_aware = peer_offered & PEER_OFFERED_DSN
2383 ? dsn_support_yes : dsn_support_no;
2386 no_flush = pipelining_active && (!mua_wrapper || addr->next);
2388 /* Add any DSN flags to the rcpt command and add to the sent string */
2393 if (peer_offered & PEER_OFFERED_DSN && !(addr->dsn_flags & rf_dsnlasthop))
2395 if (addr->dsn_flags & rf_dsnflags)
2399 Ustrcpy(p, " NOTIFY=");
2401 for (i = 0; i < 4; i++)
2402 if ((addr->dsn_flags & rf_list[i]) != 0)
2404 if (!first) *p++ = ',';
2406 Ustrcpy(p, rf_names[i]);
2411 if (addr->dsn_orcpt)
2413 string_format(p, sizeof(buffer) - (p-buffer), " ORCPT=%s",
2419 /* Now send the RCPT command, and process outstanding responses when
2420 necessary. After a timeout on RCPT, we just end the function, leaving the
2421 yield as OK, because this error can often mean that there is a problem with
2422 just one address, so we don't want to delay the host. */
2424 rcpt_addr = transport_rcpt_address(addr, tblock->rcpt_include_affixes);
2428 uschar * dummy_errstr;
2429 if ( testflag(addrlist, af_utf8_downcvt)
2430 && (rcpt_addr = string_address_utf8_to_alabel(rcpt_addr, &dummy_errstr),
2434 errno = ERRNO_EXPANDFAIL;
2440 count = smtp_write_command(&outblock, no_flush, "RCPT TO:<%s>%s%s\r\n",
2441 rcpt_addr, igquotstr, buffer);
2443 if (count < 0) goto SEND_FAILED;
2446 switch(sync_responses(first_addr, tblock->rcpt_include_affixes,
2447 &sync_addr, host, count, ob->address_retry_include_sender,
2448 lflags.pending_MAIL, 0, &inblock, ob->command_timeout, buffer,
2451 case 3: lflags.ok = TRUE; /* 2xx & 5xx => OK & progress made */
2452 case 2: completed_address = TRUE; /* 5xx (only) => progress made */
2455 case 1: lflags.ok = TRUE; /* 2xx (only) => OK, but if LMTP, */
2456 if (!lflags.lmtp) completed_address = TRUE; /* can't tell about progress yet */
2457 case 0: /* No 2xx or 5xx, but no probs */
2460 case -1: goto END_OFF; /* Timeout on RCPT */
2461 default: goto RESPONSE_FAILED; /* I/O error, or any MAIL error */
2463 lflags.pending_MAIL = FALSE; /* Dealt with MAIL */
2465 } /* Loop for next address */
2467 /* If we are an MUA wrapper, abort if any RCPTs were rejected, either
2468 permanently or temporarily. We should have flushed and synced after the last
2473 address_item *badaddr;
2474 for (badaddr = first_addr; badaddr; badaddr = badaddr->next)
2475 if (badaddr->transport_return != PENDING_OK)
2477 /*XXX could we find a better errno than 0 here? */
2478 set_errno_nohost(addrlist, 0, badaddr->message, FAIL,
2479 testflag(badaddr, af_pass_message));
2485 /* If ok is TRUE, we know we have got at least one good recipient, and must now
2486 send DATA, but if it is FALSE (in the normal, non-wrapper case), we may still
2487 have a good recipient buffered up if we are pipelining. We don't want to waste
2488 time sending DATA needlessly, so we only send it if either ok is TRUE or if we
2489 are pipelining. The responses are all handled by sync_responses().
2490 If using CHUNKING, do not send a BDAT until we know how big a chunk we want
2493 if ( !(peer_offered & PEER_OFFERED_CHUNKING)
2494 && (lflags.ok || (pipelining_active && !mua_wrapper)))
2496 int count = smtp_write_command(&outblock, FALSE, "DATA\r\n");
2498 if (count < 0) goto SEND_FAILED;
2499 switch(sync_responses(first_addr, tblock->rcpt_include_affixes, &sync_addr,
2500 host, count, ob->address_retry_include_sender, lflags.pending_MAIL,
2501 lflags.ok ? +1 : -1, &inblock, ob->command_timeout, buffer, sizeof(buffer)))
2503 case 3: lflags.ok = TRUE; /* 2xx & 5xx => OK & progress made */
2504 case 2: completed_address = TRUE; /* 5xx (only) => progress made */
2507 case 1: lflags.ok = TRUE; /* 2xx (only) => OK, but if LMTP, */
2508 if (!lflags.lmtp) completed_address = TRUE; /* can't tell about progress yet */
2509 case 0: break; /* No 2xx or 5xx, but no probs */
2511 case -1: goto END_OFF; /* Timeout on RCPT */
2512 default: goto RESPONSE_FAILED; /* I/O error, or any MAIL/DATA error */
2514 pipelining_active = FALSE;
2517 /* If there were no good recipients (but otherwise there have been no
2518 problems), just set ok TRUE, since we have handled address-specific errors
2519 already. Otherwise, it's OK to send the message. Use the check/escape mechanism
2520 for handling the SMTP dot-handling protocol, flagging to apply to headers as
2521 well as body. Set the appropriate timeout value to be used for each chunk.
2522 (Haven't been able to make it work using select() for writing yet.) */
2524 if (!(peer_offered & PEER_OFFERED_CHUNKING) && !lflags.ok)
2526 /* Save the first address of the next batch. */
2533 transport_ctx tctx = {
2536 US".", US"..", /* Escaping strings */
2537 topt_use_crlf | topt_escape_headers
2538 | (tblock->body_only ? topt_no_headers : 0)
2539 | (tblock->headers_only ? topt_no_body : 0)
2540 | (tblock->return_path_add ? topt_add_return_path : 0)
2541 | (tblock->delivery_date_add ? topt_add_delivery_date : 0)
2542 | (tblock->envelope_to_add ? topt_add_envelope_to : 0)
2545 /* If using CHUNKING we need a callback from the generic transport
2546 support to us, for the sending of BDAT smtp commands and the reaping
2547 of responses. The callback needs a whole bunch of state so set up
2548 a transport-context structure to be passed around. */
2550 if (peer_offered & PEER_OFFERED_CHUNKING)
2552 tctx.check_string = tctx.escape_string = NULL;
2553 tctx.options |= topt_use_bdat;
2554 tctx.chunk_cb = smtp_chunk_cmd_callback;
2555 tctx.inblock = &inblock;
2556 tctx.outblock = &outblock;
2558 tctx.first_addr = first_addr;
2559 tctx.sync_addr = &sync_addr;
2560 tctx.pending_MAIL = lflags.pending_MAIL;
2561 tctx.pending_BDAT = FALSE;
2562 tctx.good_RCPT = lflags.ok;
2563 tctx.completed_address = &completed_address;
2565 tctx.buffer = buffer;
2568 tctx.options |= topt_end_dot;
2570 /* Save the first address of the next batch. */
2573 /* Responses from CHUNKING commands go in buffer. Otherwise,
2574 there has not been a response. */
2578 sigalrm_seen = FALSE;
2579 transport_write_timeout = ob->data_timeout;
2580 smtp_command = US"sending data block"; /* For error messages */
2581 DEBUG(D_transport|D_v)
2582 if (peer_offered & PEER_OFFERED_CHUNKING)
2583 debug_printf(" will write message using CHUNKING\n");
2585 debug_printf(" SMTP>> writing message and terminating \".\"\n");
2586 transport_count = 0;
2588 #ifndef DISABLE_DKIM
2589 lflags.ok = dkim_transport_write_message(inblock.sock, &tctx, &ob->dkim);
2591 lflags.ok = transport_write_message(inblock.sock, &tctx, 0);
2594 /* transport_write_message() uses write() because it is called from other
2595 places to write to non-sockets. This means that under some OS (e.g. Solaris)
2596 it can exit with "Broken pipe" as its error. This really means that the
2597 socket got closed at the far end. */
2599 transport_write_timeout = 0; /* for subsequent transports */
2601 /* Failure can either be some kind of I/O disaster (including timeout),
2602 or the failure of a transport filter or the expansion of added headers.
2603 Or, when CHUNKING, it can be a protocol-detected failure. */
2606 goto RESPONSE_FAILED;
2608 /* We used to send the terminating "." explicitly here, but because of
2609 buffering effects at both ends of TCP/IP connections, you don't gain
2610 anything by keeping it separate, so it might as well go in the final
2611 data buffer for efficiency. This is now done by setting the topt_end_dot
2614 smtp_command = US"end of data";
2616 if (peer_offered & PEER_OFFERED_CHUNKING && tctx.cmd_count > 1)
2618 /* Reap any outstanding MAIL & RCPT commands, but not a DATA-go-ahead */
2619 switch(sync_responses(first_addr, tblock->rcpt_include_affixes, &sync_addr,
2620 host, tctx.cmd_count-1, ob->address_retry_include_sender,
2621 lflags.pending_MAIL, 0,
2622 &inblock, ob->command_timeout, buffer, sizeof(buffer)))
2624 case 3: lflags.ok = TRUE; /* 2xx & 5xx => OK & progress made */
2625 case 2: completed_address = TRUE; /* 5xx (only) => progress made */
2628 case 1: lflags.ok = TRUE; /* 2xx (only) => OK, but if LMTP, */
2629 if (!lflags.lmtp) completed_address = TRUE; /* can't tell about progress yet */
2630 case 0: break; /* No 2xx or 5xx, but no probs */
2632 case -1: goto END_OFF; /* Timeout on RCPT */
2633 default: goto RESPONSE_FAILED; /* I/O error, or any MAIL/DATA error */
2637 #ifndef DISABLE_PRDR
2638 /* For PRDR we optionally get a partial-responses warning
2639 * followed by the individual responses, before going on with
2640 * the overall response. If we don't get the warning then deal
2641 * with per non-PRDR. */
2642 if(lflags.prdr_active)
2644 lflags.ok = smtp_read_response(&inblock, buffer, sizeof(buffer), '3',
2646 if (!lflags.ok && errno == 0) switch(buffer[0])
2648 case '2': lflags.prdr_active = FALSE;
2651 case '4': errno = ERRNO_DATA4XX;
2652 addrlist->more_errno |=
2653 ((buffer[1] - '0')*10 + buffer[2] - '0') << 8;
2660 /* For non-PRDR SMTP, we now read a single response that applies to the
2661 whole message. If it is OK, then all the addresses have been delivered. */
2665 lflags.ok = smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
2667 if (!lflags.ok && errno == 0 && buffer[0] == '4')
2669 errno = ERRNO_DATA4XX;
2670 addrlist->more_errno |= ((buffer[1] - '0')*10 + buffer[2] - '0') << 8;
2674 /* For LMTP, we get back a response for every RCPT command that we sent;
2675 some may be accepted and some rejected. For those that get a response, their
2676 status is fixed; any that are accepted have been handed over, even if later
2677 responses crash - at least, that's how I read RFC 2033.
2679 If all went well, mark the recipient addresses as completed, record which
2680 host/IPaddress they were delivered to, and cut out RSET when sending another
2681 message down the same channel. Write the completed addresses to the journal
2682 now so that they are recorded in case there is a crash of hardware or
2683 software before the spool gets updated. Also record the final SMTP
2684 confirmation if needed (for SMTP only). */
2689 int delivery_time = (int)(time(NULL) - start_delivery_time);
2691 uschar *conf = NULL;
2693 lflags.send_rset = FALSE;
2694 pipelining_active = FALSE;
2696 /* Set up confirmation if needed - applies only to SMTP */
2699 #ifdef DISABLE_EVENT
2700 LOGGING(smtp_confirmation) &&
2705 const uschar *s = string_printing(buffer);
2706 /* deconst cast ok here as string_printing was checked to have alloc'n'copied */
2707 conf = (s == buffer)? (uschar *)string_copy(s) : US s;
2710 /* Process all transported addresses - for LMTP or PRDR, read a status for
2713 for (addr = addrlist; addr != first_addr; addr = addr->next)
2715 if (addr->transport_return != PENDING_OK) continue;
2717 /* LMTP - if the response fails badly (e.g. timeout), use it for all the
2718 remaining addresses. Otherwise, it's a return code for just the one
2719 address. For temporary errors, add a retry item for the address so that
2720 it doesn't get tried again too soon. */
2722 #ifndef DISABLE_PRDR
2723 if (lflags.lmtp || lflags.prdr_active)
2728 if (!smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
2731 if (errno != 0 || buffer[0] == 0) goto RESPONSE_FAILED;
2732 addr->message = string_sprintf(
2733 #ifndef DISABLE_PRDR
2734 "%s error after %s: %s", lflags.prdr_active ? "PRDR":"LMTP",
2736 "LMTP error after %s: %s",
2738 big_buffer, string_printing(buffer));
2739 setflag(addr, af_pass_message); /* Allow message to go to user */
2740 if (buffer[0] == '5')
2741 addr->transport_return = FAIL;
2744 errno = ERRNO_DATA4XX;
2745 addr->more_errno |= ((buffer[1] - '0')*10 + buffer[2] - '0') << 8;
2746 addr->transport_return = DEFER;
2747 #ifndef DISABLE_PRDR
2748 if (!lflags.prdr_active)
2750 retry_add_item(addr, addr->address_retry_key, 0);
2754 completed_address = TRUE; /* NOW we can set this flag */
2755 if (LOGGING(smtp_confirmation))
2757 const uschar *s = string_printing(buffer);
2758 /* deconst cast ok here as string_printing was checked to have alloc'n'copied */
2759 conf = (s == buffer)? (uschar *)string_copy(s) : US s;
2763 /* SMTP, or success return from LMTP for this address. Pass back the
2764 actual host that was used. */
2766 addr->transport_return = OK;
2767 addr->more_errno = delivery_time;
2768 addr->host_used = host;
2769 addr->special_action = flag;
2770 addr->message = conf;
2771 #ifndef DISABLE_PRDR
2772 if (lflags.prdr_active) addr->flags |= af_prdr_used;
2774 if (peer_offered & PEER_OFFERED_CHUNKING) addr->flags |= af_chunking_used;
2777 #ifndef DISABLE_PRDR
2778 if (!lflags.prdr_active)
2781 /* Update the journal. For homonymic addresses, use the base address plus
2782 the transport name. See lots of comments in deliver.c about the reasons
2783 for the complications when homonyms are involved. Just carry on after
2784 write error, as it may prove possible to update the spool file later. */
2786 if (testflag(addr, af_homonym))
2787 sprintf(CS buffer, "%.500s/%s\n", addr->unique + 3, tblock->name);
2789 sprintf(CS buffer, "%.500s\n", addr->unique);
2791 DEBUG(D_deliver) debug_printf("journalling %s\n", buffer);
2792 len = Ustrlen(CS buffer);
2793 if (write(journal_fd, buffer, len) != len)
2794 log_write(0, LOG_MAIN|LOG_PANIC, "failed to write journal for "
2795 "%s: %s", buffer, strerror(errno));
2799 #ifndef DISABLE_PRDR
2800 if (lflags.prdr_active)
2802 /* PRDR - get the final, overall response. For any non-success
2803 upgrade all the address statuses. */
2804 lflags.ok = smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
2808 if(errno == 0 && buffer[0] == '4')
2810 errno = ERRNO_DATA4XX;
2811 addrlist->more_errno |= ((buffer[1] - '0')*10 + buffer[2] - '0') << 8;
2813 for (addr = addrlist; addr != first_addr; addr = addr->next)
2814 if (buffer[0] == '5' || addr->transport_return == OK)
2815 addr->transport_return = PENDING_OK; /* allow set_errno action */
2816 goto RESPONSE_FAILED;
2819 /* Update the journal, or setup retry. */
2820 for (addr = addrlist; addr != first_addr; addr = addr->next)
2821 if (addr->transport_return == OK)
2823 if (testflag(addr, af_homonym))
2824 sprintf(CS buffer, "%.500s/%s\n", addr->unique + 3, tblock->name);
2826 sprintf(CS buffer, "%.500s\n", addr->unique);
2828 DEBUG(D_deliver) debug_printf("journalling(PRDR) %s\n", buffer);
2829 len = Ustrlen(CS buffer);
2830 if (write(journal_fd, buffer, len) != len)
2831 log_write(0, LOG_MAIN|LOG_PANIC, "failed to write journal for "
2832 "%s: %s", buffer, strerror(errno));
2834 else if (addr->transport_return == DEFER)
2835 retry_add_item(addr, addr->address_retry_key, -2);
2839 /* Ensure the journal file is pushed out to disk. */
2841 if (EXIMfsync(journal_fd) < 0)
2842 log_write(0, LOG_MAIN|LOG_PANIC, "failed to fsync journal: %s",
2848 /* Handle general (not specific to one address) failures here. The value of ok
2849 is used to skip over this code on the falling through case. A timeout causes a
2850 deferral. Other errors may defer or fail according to the response code, and
2851 may set up a special errno value, e.g. after connection chopped, which is
2852 assumed if errno == 0 and there is no text in the buffer. If control reaches
2853 here during the setting up phase (i.e. before MAIL FROM) then always defer, as
2854 the problem is not related to this specific message. */
2859 uschar * set_message;
2865 lflags.send_quit = check_response(host, &save_errno, addrlist->more_errno,
2866 buffer, &code, &message, &pass_message);
2874 message = US string_sprintf("send() to %s [%s] failed: %s",
2875 host->name, host->address, strerror(save_errno));
2876 lflags.send_quit = FALSE;
2880 /* This label is jumped to directly when a TLS negotiation has failed,
2881 or was not done for a host for which it is required. Values will be set
2882 in message and save_errno, and setting_up will always be true. Treat as
2883 a temporary error. */
2890 /* If the failure happened while setting up the call, see if the failure was
2891 a 5xx response (this will either be on connection, or following HELO - a 5xx
2892 after EHLO causes it to try HELO). If so, fail all addresses, as this host is
2893 never going to accept them. For other errors during setting up (timeouts or
2894 whatever), defer all addresses, and yield DEFER, so that the host is not
2895 tried again for a while. */
2898 lflags.ok = FALSE; /* For when reached by GOTO */
2899 set_message = message;
2901 if (lflags.setting_up)
2905 yield = set_rc = DEFER;
2907 /* We want to handle timeouts after MAIL or "." and loss of connection after
2908 "." specially. They can indicate a problem with the sender address or with
2909 the contents of the message rather than a real error on the connection. These
2910 cases are treated in the same way as a 4xx response. This next bit of code
2911 does the classification. */
2920 case ERRNO_UTF8_FWD:
2927 message_error = TRUE;
2931 message_error = Ustrncmp(smtp_command,"MAIL",4) == 0 ||
2932 Ustrncmp(smtp_command,"end ",4) == 0;
2935 case ERRNO_SMTPCLOSED:
2936 message_error = Ustrncmp(smtp_command,"end ",4) == 0;
2940 message_error = FALSE;
2944 /* Handle the cases that are treated as message errors. These are:
2946 (a) negative response or timeout after MAIL
2947 (b) negative response after DATA
2948 (c) negative response or timeout or dropped connection after "."
2949 (d) utf8 support required and not offered
2951 It won't be a negative response or timeout after RCPT, as that is dealt
2952 with separately above. The action in all cases is to set an appropriate
2953 error code for all the addresses, but to leave yield set to OK because the
2954 host itself has not failed. Of course, it might in practice have failed
2955 when we've had a timeout, but if so, we'll discover that at the next
2956 delivery attempt. For a temporary error, set the message_defer flag, and
2957 write to the logs for information if this is not the last host. The error
2958 for the last host will be logged as part of the address's log line. */
2962 if (mua_wrapper) code = '5'; /* Force hard failure in wrapper mode */
2964 /* If there's an errno, the message contains just the identity of
2969 else /* Anything other than 5 is treated as temporary */
2973 message = US string_sprintf("%s: %s", message, strerror(save_errno));
2974 if (host->next != NULL) log_write(0, LOG_MAIN, "%s", message);
2975 msglog_line(host, message);
2976 *message_defer = TRUE;
2980 /* Otherwise, we have an I/O error or a timeout other than after MAIL or
2981 ".", or some other transportation error. We defer all addresses and yield
2982 DEFER, except for the case of failed add_headers expansion, or a transport
2983 filter failure, when the yield should be ERROR, to stop it trying other
2989 yield = (save_errno == ERRNO_CHHEADER_FAIL ||
2990 save_errno == ERRNO_FILTER_FAIL)? ERROR : DEFER;
2994 set_errno(addrlist, save_errno, set_message, set_rc, pass_message, host
2995 #ifdef EXPERIMENTAL_DSN_INFO
2996 , smtp_greeting, helo_response
3002 /* If all has gone well, send_quit will be set TRUE, implying we can end the
3003 SMTP session tidily. However, if there were too many addresses to send in one
3004 message (indicated by first_addr being non-NULL) we want to carry on with the
3005 rest of them. Also, it is desirable to send more than one message down the SMTP
3006 connection if there are several waiting, provided we haven't already sent so
3007 many as to hit the configured limit. The function transport_check_waiting looks
3008 for a waiting message and returns its id. Then transport_pass_socket tries to
3009 set up a continued delivery by passing the socket on to another process. The
3010 variable send_rset is FALSE if a message has just been successfully transfered.
3012 If we are already sending down a continued channel, there may be further
3013 addresses not yet delivered that are aimed at the same host, but which have not
3014 been passed in this run of the transport. In this case, continue_more will be
3015 true, and all we should do is send RSET if necessary, and return, leaving the
3018 However, if no address was disposed of, i.e. all addresses got 4xx errors, we
3019 do not want to continue with other messages down the same channel, because that
3020 can lead to looping between two or more messages, all with the same,
3021 temporarily failing address(es). [The retry information isn't updated yet, so
3022 new processes keep on trying.] We probably also don't want to try more of this
3023 message's addresses either.
3025 If we have started a TLS session, we have to end it before passing the
3026 connection to a new process. However, not all servers can handle this (Exim
3027 can), so we do not pass such a connection on if the host matches
3028 hosts_nopass_tls. */
3031 debug_printf("ok=%d send_quit=%d send_rset=%d continue_more=%d "
3032 "yield=%d first_address is %sNULL\n", lflags.ok, lflags.send_quit,
3033 lflags.send_rset, continue_more, yield, first_addr ? "not " : "");
3035 if (completed_address && lflags.ok && lflags.send_quit)
3038 smtp_compare_t t_compare;
3040 t_compare.tblock = tblock;
3041 t_compare.current_sender_address = sender_address;
3043 if ( first_addr != NULL
3045 || ( ( tls_out.active < 0
3046 || verify_check_given_host(&ob->hosts_nopass_tls, host) != OK
3049 transport_check_waiting(tblock->name, host->name,
3050 tblock->connection_max_messages, new_message_id, &more,
3051 (oicf)smtp_are_same_identities, (void*)&t_compare)
3057 if (lflags.send_rset)
3059 if (! (lflags.ok = smtp_write_command(&outblock, FALSE, "RSET\r\n") >= 0))
3061 msg = US string_sprintf("send() to %s [%s] failed: %s", host->name,
3062 host->address, strerror(save_errno));
3063 lflags.send_quit = FALSE;
3065 else if (! (lflags.ok = smtp_read_response(&inblock, buffer,
3066 sizeof(buffer), '2', ob->command_timeout)))
3069 lflags.send_quit = check_response(host, &errno, 0, buffer, &code, &msg,
3071 if (!lflags.send_quit)
3073 DEBUG(D_transport) debug_printf("H=%s [%s] %s\n",
3074 host->name, host->address, msg);
3079 /* Either RSET was not needed, or it succeeded */
3083 if (first_addr != NULL) /* More addresses still to be sent */
3084 { /* in this run of the transport */
3085 continue_sequence++; /* Causes * in logging */
3088 if (continue_more) return yield; /* More addresses for another run */
3090 /* Pass the socket to a new Exim process. Before doing so, we must shut
3091 down TLS. Not all MTAs allow for the continuation of the SMTP session
3092 when TLS is shut down. We test for this by sending a new EHLO. If we
3093 don't get a good response, we don't attempt to pass the socket on. */
3096 if (tls_out.active >= 0)
3098 tls_close(FALSE, TRUE);
3099 smtp_peer_options = smtp_peer_options_wrap;
3103 lflags.ok = smtp_write_command(&outblock,FALSE,"EHLO %s\r\n",helo_data) >= 0 &&
3104 smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
3105 ob->command_timeout);
3109 /* If the socket is successfully passed, we musn't send QUIT (or
3110 indeed anything!) from here. */
3112 /*XXX DSN_INFO: assume likely to do new HELO; but for greet we'll want to
3113 propagate it from the initial
3115 if (lflags.ok && transport_pass_socket(tblock->name, host->name,
3116 host->address, new_message_id, inblock.sock))
3117 lflags.send_quit = FALSE;
3120 /* If RSET failed and there are addresses left, they get deferred. */
3122 else set_errno(first_addr, errno, msg, DEFER, FALSE, host
3123 #ifdef EXPERIMENTAL_DSN_INFO
3124 , smtp_greeting, helo_response
3130 /* End off tidily with QUIT unless the connection has died or the socket has
3131 been passed to another process. There has been discussion on the net about what
3132 to do after sending QUIT. The wording of the RFC suggests that it is necessary
3133 to wait for a response, but on the other hand, there isn't anything one can do
3134 with an error response, other than log it. Exim used to do that. However,
3135 further discussion suggested that it is positively advantageous not to wait for
3136 the response, but to close the session immediately. This is supposed to move
3137 the TCP/IP TIME_WAIT state from the server to the client, thereby removing some
3138 load from the server. (Hosts that are both servers and clients may not see much
3139 difference, of course.) Further discussion indicated that this was safe to do
3140 on Unix systems which have decent implementations of TCP/IP that leave the
3141 connection around for a while (TIME_WAIT) after the application has gone away.
3142 This enables the response sent by the server to be properly ACKed rather than
3143 timed out, as can happen on broken TCP/IP implementations on other OS.
3145 This change is being made on 31-Jul-98. After over a year of trouble-free
3146 operation, the old commented-out code was removed on 17-Sep-99. */
3149 if (lflags.send_quit) (void)smtp_write_command(&outblock, FALSE, "QUIT\r\n");
3154 tls_close(FALSE, TRUE);
3157 /* Close the socket, and return the appropriate value, first setting
3158 works because the NULL setting is passed back to the calling process, and
3159 remote_max_parallel is forced to 1 when delivering over an existing connection,
3161 If all went well and continue_more is set, we shouldn't actually get here if
3162 there are further addresses, as the return above will be taken. However,
3163 writing RSET might have failed, or there may be other addresses whose hosts are
3164 specified in the transports, and therefore not visible at top level, in which
3165 case continue_more won't get set. */
3167 HDEBUG(D_transport|D_acl|D_v) debug_printf(" SMTP(close)>>\n");
3168 if (lflags.send_quit)
3170 shutdown(outblock.sock, SHUT_WR);
3171 if (fcntl(inblock.sock, F_SETFL, O_NONBLOCK) == 0)
3172 for (rc = 16; read(inblock.sock, inbuffer, sizeof(inbuffer)) > 0 && rc > 0;)
3173 rc--; /* drain socket */
3175 (void)close(inblock.sock);
3177 #ifndef DISABLE_EVENT
3178 (void) event_raise(tblock->event_action, US"tcp:close", NULL);
3181 continue_transport = NULL;
3182 continue_hostname = NULL;
3189 /*************************************************
3190 * Closedown entry point *
3191 *************************************************/
3193 /* This function is called when exim is passed an open smtp channel
3194 from another incarnation, but the message which it has been asked
3195 to deliver no longer exists. The channel is on stdin.
3197 We might do fancy things like looking for another message to send down
3198 the channel, but if the one we sought has gone, it has probably been
3199 delivered by some other process that itself will seek further messages,
3200 so just close down our connection.
3202 Argument: pointer to the transport instance block
3207 smtp_transport_closedown(transport_instance *tblock)
3209 smtp_transport_options_block *ob =
3210 (smtp_transport_options_block *)(tblock->options_block);
3211 smtp_inblock inblock;
3212 smtp_outblock outblock;
3214 uschar inbuffer[4096];
3215 uschar outbuffer[16];
3217 inblock.sock = fileno(stdin);
3218 inblock.buffer = inbuffer;
3219 inblock.buffersize = sizeof(inbuffer);
3220 inblock.ptr = inbuffer;
3221 inblock.ptrend = inbuffer;
3223 outblock.sock = inblock.sock;
3224 outblock.buffersize = sizeof(outbuffer);
3225 outblock.buffer = outbuffer;
3226 outblock.ptr = outbuffer;
3227 outblock.cmd_count = 0;
3228 outblock.authenticating = FALSE;
3230 (void)smtp_write_command(&outblock, FALSE, "QUIT\r\n");
3231 (void)smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
3232 ob->command_timeout);
3233 (void)close(inblock.sock);
3238 /*************************************************
3239 * Prepare addresses for delivery *
3240 *************************************************/
3242 /* This function is called to flush out error settings from previous delivery
3243 attempts to other hosts. It also records whether we got here via an MX record
3244 or not in the more_errno field of the address. We are interested only in
3245 addresses that are still marked DEFER - others may have got delivered to a
3246 previously considered IP address. Set their status to PENDING_DEFER to indicate
3247 which ones are relevant this time.
3250 addrlist the list of addresses
3251 host the host we are delivering to
3253 Returns: the first address for this delivery
3256 static address_item *
3257 prepare_addresses(address_item *addrlist, host_item *host)
3259 address_item *first_addr = NULL;
3261 for (addr = addrlist; addr; addr = addr->next)
3262 if (addr->transport_return == DEFER)
3264 if (!first_addr) first_addr = addr;
3265 addr->transport_return = PENDING_DEFER;
3266 addr->basic_errno = 0;
3267 addr->more_errno = (host->mx >= 0)? 'M' : 'A';
3268 addr->message = NULL;
3270 addr->cipher = NULL;
3271 addr->ourcert = NULL;
3272 addr->peercert = NULL;
3273 addr->peerdn = NULL;
3274 addr->ocsp = OCSP_NOT_REQ;
3276 #ifdef EXPERIMENTAL_DSN_INFO
3277 addr->smtp_greeting = NULL;
3278 addr->helo_response = NULL;
3286 /*************************************************
3287 * Main entry point *
3288 *************************************************/
3290 /* See local README for interface details. As this is a remote transport, it is
3291 given a chain of addresses to be delivered in one connection, if possible. It
3292 always returns TRUE, indicating that each address has its own independent
3293 status set, except if there is a setting up problem, in which case it returns
3297 smtp_transport_entry(
3298 transport_instance *tblock, /* data for this instantiation */
3299 address_item *addrlist) /* addresses we are working on */
3303 int hosts_defer = 0;
3305 int hosts_looked_up = 0;
3306 int hosts_retry = 0;
3307 int hosts_serial = 0;
3308 int hosts_total = 0;
3309 int total_hosts_tried = 0;
3311 BOOL expired = TRUE;
3312 uschar *expanded_hosts = NULL;
3314 uschar *tid = string_sprintf("%s transport", tblock->name);
3315 smtp_transport_options_block *ob =
3316 (smtp_transport_options_block *)(tblock->options_block);
3317 host_item *hostlist = addrlist->host_list;
3318 host_item *host = NULL;
3322 debug_printf("%s transport entered\n", tblock->name);
3323 for (addr = addrlist; addr; addr = addr->next)
3324 debug_printf(" %s\n", addr->address);
3327 debug_printf("hostlist:\n");
3328 for (host = hostlist; host; host = host->next)
3329 debug_printf(" %s:%d\n", host->name, host->port);
3331 if (continue_hostname) debug_printf("already connected to %s [%s]\n",
3332 continue_hostname, continue_host_address);
3335 /* Set the flag requesting that these hosts be added to the waiting
3336 database if the delivery fails temporarily or if we are running with
3337 queue_smtp or a 2-stage queue run. This gets unset for certain
3338 kinds of error, typically those that are specific to the message. */
3340 update_waiting = TRUE;
3342 /* If a host list is not defined for the addresses - they must all have the
3343 same one in order to be passed to a single transport - or if the transport has
3344 a host list with hosts_override set, use the host list supplied with the
3345 transport. It is an error for this not to exist. */
3347 if (!hostlist || (ob->hosts_override && ob->hosts))
3351 addrlist->message = string_sprintf("%s transport called with no hosts set",
3353 addrlist->transport_return = PANIC;
3354 return FALSE; /* Only top address has status */
3357 DEBUG(D_transport) debug_printf("using the transport's hosts: %s\n",
3360 /* If the transport's host list contains no '$' characters, and we are not
3361 randomizing, it is fixed and therefore a chain of hosts can be built once
3362 and for all, and remembered for subsequent use by other calls to this
3363 transport. If, on the other hand, the host list does contain '$', or we are
3364 randomizing its order, we have to rebuild it each time. In the fixed case,
3365 as the hosts string will never be used again, it doesn't matter that we
3366 replace all the : characters with zeros. */
3370 uschar *s = ob->hosts;
3372 if (Ustrchr(s, '$') != NULL)
3374 if (!(expanded_hosts = expand_string(s)))
3376 addrlist->message = string_sprintf("failed to expand list of hosts "
3377 "\"%s\" in %s transport: %s", s, tblock->name, expand_string_message);
3378 addrlist->transport_return = search_find_defer ? DEFER : PANIC;
3379 return FALSE; /* Only top address has status */
3381 DEBUG(D_transport) debug_printf("expanded list of hosts \"%s\" to "
3382 "\"%s\"\n", s, expanded_hosts);
3386 if (ob->hosts_randomize) s = expanded_hosts = string_copy(s);
3388 host_build_hostlist(&hostlist, s, ob->hosts_randomize);
3390 /* Check that the expansion yielded something useful. */
3394 string_sprintf("%s transport has empty hosts setting", tblock->name);
3395 addrlist->transport_return = PANIC;
3396 return FALSE; /* Only top address has status */
3399 /* If there was no expansion of hosts, save the host list for
3402 if (!expanded_hosts) ob->hostlist = hostlist;
3405 /* This is not the first time this transport has been run in this delivery;
3406 the host list was built previously. */
3409 hostlist = ob->hostlist;
3412 /* The host list was supplied with the address. If hosts_randomize is set, we
3413 must sort it into a random order if it did not come from MX records and has not
3414 already been randomized (but don't bother if continuing down an existing
3417 else if (ob->hosts_randomize && hostlist->mx == MX_NONE && !continue_hostname)
3419 host_item *newlist = NULL;
3422 host_item *h = hostlist;
3423 hostlist = hostlist->next;
3425 h->sort_key = random_number(100);
3432 else if (h->sort_key < newlist->sort_key)
3439 host_item *hh = newlist;
3442 if (h->sort_key < hh->next->sort_key) break;
3450 hostlist = addrlist->host_list = newlist;
3453 /* Sort out the default port. */
3455 if (!smtp_get_port(ob->port, addrlist, &port, tid)) return FALSE;
3457 /* For each host-plus-IP-address on the list:
3459 . If this is a continued delivery and the host isn't the one with the
3460 current connection, skip.
3462 . If the status is unusable (i.e. previously failed or retry checked), skip.
3464 . If no IP address set, get the address, either by turning the name into
3465 an address, calling gethostbyname if gethostbyname is on, or by calling
3466 the DNS. The DNS may yield multiple addresses, in which case insert the
3467 extra ones into the list.
3469 . Get the retry data if not previously obtained for this address and set the
3470 field which remembers the state of this address. Skip if the retry time is
3471 not reached. If not, remember whether retry data was found. The retry string
3472 contains both the name and the IP address.
3474 . Scan the list of addresses and mark those whose status is DEFER as
3475 PENDING_DEFER. These are the only ones that will be processed in this cycle
3478 . Make a delivery attempt - addresses marked PENDING_DEFER will be tried.
3479 Some addresses may be successfully delivered, others may fail, and yet
3480 others may get temporary errors and so get marked DEFER.
3482 . The return from the delivery attempt is OK if a connection was made and a
3483 valid SMTP dialogue was completed. Otherwise it is DEFER.
3485 . If OK, add a "remove" retry item for this host/IPaddress, if any.
3487 . If fail to connect, or other defer state, add a retry item.
3489 . If there are any addresses whose status is still DEFER, carry on to the
3490 next host/IPaddress, unless we have tried the number of hosts given
3491 by hosts_max_try or hosts_max_try_hardlimit; otherwise return. Note that
3492 there is some fancy logic for hosts_max_try that means its limit can be
3493 overstepped in some circumstances.
3495 If we get to the end of the list, all hosts have deferred at least one address,
3496 or not reached their retry times. If delay_after_cutoff is unset, it requests a
3497 delivery attempt to those hosts whose last try was before the arrival time of
3498 the current message. To cope with this, we have to go round the loop a second
3499 time. After that, set the status and error data for any addresses that haven't
3500 had it set already. */
3502 for (cutoff_retry = 0;
3503 expired && cutoff_retry < (ob->delay_after_cutoff ? 1 : 2);
3506 host_item *nexthost = NULL;
3507 int unexpired_hosts_tried = 0;
3509 for (host = hostlist;
3511 && unexpired_hosts_tried < ob->hosts_max_try
3512 && total_hosts_tried < ob->hosts_max_try_hardlimit;
3518 BOOL host_is_expired = FALSE;
3519 BOOL message_defer = FALSE;
3520 BOOL some_deferred = FALSE;
3521 address_item *first_addr = NULL;
3522 uschar *interface = NULL;
3523 uschar *retry_host_key = NULL;
3524 uschar *retry_message_key = NULL;
3525 uschar *serialize_key = NULL;
3527 /* Default next host is next host. :-) But this can vary if the
3528 hosts_max_try limit is hit (see below). It may also be reset if a host
3529 address is looked up here (in case the host was multihomed). */
3531 nexthost = host->next;
3533 /* If the address hasn't yet been obtained from the host name, look it up
3534 now, unless the host is already marked as unusable. If it is marked as
3535 unusable, it means that the router was unable to find its IP address (in
3536 the DNS or wherever) OR we are in the 2nd time round the cutoff loop, and
3537 the lookup failed last time. We don't get this far if *all* MX records
3538 point to non-existent hosts; that is treated as a hard error.
3540 We can just skip this host entirely. When the hosts came from the router,
3541 the address will timeout based on the other host(s); when the address is
3542 looked up below, there is an explicit retry record added.
3544 Note that we mustn't skip unusable hosts if the address is not unset; they
3545 may be needed as expired hosts on the 2nd time round the cutoff loop. */
3549 int new_port, flags;
3552 if (host->status >= hstatus_unusable)
3554 DEBUG(D_transport) debug_printf("%s has no address and is unusable - skipping\n",
3559 DEBUG(D_transport) debug_printf("getting address for %s\n", host->name);
3561 /* The host name is permitted to have an attached port. Find it, and
3562 strip it from the name. Just remember it for now. */
3564 new_port = host_item_get_port(host);
3566 /* Count hosts looked up */
3570 /* Find by name if so configured, or if it's an IP address. We don't
3571 just copy the IP address, because we need the test-for-local to happen. */
3573 flags = HOST_FIND_BY_A;
3574 if (ob->dns_qualify_single) flags |= HOST_FIND_QUALIFY_SINGLE;
3575 if (ob->dns_search_parents) flags |= HOST_FIND_SEARCH_PARENTS;
3577 if (ob->gethostbyname || string_is_ip_address(host->name, NULL) != 0)
3578 rc = host_find_byname(host, NULL, flags, NULL, TRUE);
3580 rc = host_find_bydns(host, NULL, flags, NULL, NULL, NULL,
3581 &ob->dnssec, /* domains for request/require */
3584 /* Update the host (and any additional blocks, resulting from
3585 multihoming) with a host-specific port, if any. */
3587 for (hh = host; hh != nexthost; hh = hh->next) hh->port = new_port;
3589 /* Failure to find the host at this time (usually DNS temporary failure)
3590 is really a kind of routing failure rather than a transport failure.
3591 Therefore we add a retry item of the routing kind, not to stop us trying
3592 to look this name up here again, but to ensure the address gets timed
3593 out if the failures go on long enough. A complete failure at this point
3594 commonly points to a configuration error, but the best action is still
3595 to carry on for the next host. */
3597 if (rc == HOST_FIND_AGAIN || rc == HOST_FIND_FAILED)
3599 retry_add_item(addrlist, string_sprintf("R:%s", host->name), 0);
3601 if (rc == HOST_FIND_AGAIN) hosts_defer++; else hosts_fail++;
3602 DEBUG(D_transport) debug_printf("rc = %s for %s\n", (rc == HOST_FIND_AGAIN)?
3603 "HOST_FIND_AGAIN" : "HOST_FIND_FAILED", host->name);
3604 host->status = hstatus_unusable;
3606 for (addr = addrlist; addr; addr = addr->next)
3608 if (addr->transport_return != DEFER) continue;
3609 addr->basic_errno = ERRNO_UNKNOWNHOST;
3611 string_sprintf("failed to lookup IP address for %s", host->name);
3616 /* If the host is actually the local host, we may have a problem, or
3617 there may be some cunning configuration going on. In the problem case,
3618 log things and give up. The default transport status is already DEFER. */
3620 if (rc == HOST_FOUND_LOCAL && !ob->allow_localhost)
3622 for (addr = addrlist; addr; addr = addr->next)
3624 addr->basic_errno = 0;
3625 addr->message = string_sprintf("%s transport found host %s to be "
3626 "local", tblock->name, host->name);
3630 } /* End of block for IP address lookup */
3632 /* If this is a continued delivery, we are interested only in the host
3633 which matches the name of the existing open channel. The check is put
3634 here after the local host lookup, in case the name gets expanded as a
3635 result of the lookup. Set expired FALSE, to save the outer loop executing
3638 if ( continue_hostname
3639 && ( Ustrcmp(continue_hostname, host->name) != 0
3640 || Ustrcmp(continue_host_address, host->address) != 0
3644 continue; /* With next host */
3647 /* Reset the default next host in case a multihomed host whose addresses
3648 are not looked up till just above added to the host list. */
3650 nexthost = host->next;
3652 /* If queue_smtp is set (-odqs or the first part of a 2-stage run), or the
3653 domain is in queue_smtp_domains, we don't actually want to attempt any
3654 deliveries. When doing a queue run, queue_smtp_domains is always unset. If
3655 there is a lookup defer in queue_smtp_domains, proceed as if the domain
3656 were not in it. We don't want to hold up all SMTP deliveries! Except when
3657 doing a two-stage queue run, don't do this if forcing. */
3659 if ((!deliver_force || queue_2stage) && (queue_smtp ||
3660 match_isinlist(addrlist->domain,
3661 (const uschar **)&queue_smtp_domains, 0,
3662 &domainlist_anchor, NULL, MCL_DOMAIN, TRUE, NULL) == OK))
3665 for (addr = addrlist; addr; addr = addr->next)
3666 if (addr->transport_return == DEFER)
3667 addr->message = US"domain matches queue_smtp_domains, or -odqs set";
3668 continue; /* With next host */
3671 /* Count hosts being considered - purely for an intelligent comment
3672 if none are usable. */
3676 /* Set $host and $host address now in case they are needed for the
3677 interface expansion or the serialize_hosts check; they remain set if an
3678 actual delivery happens. */
3680 deliver_host = host->name;
3681 deliver_host_address = host->address;
3682 lookup_dnssec_authenticated = host->dnssec == DS_YES ? US"yes"
3683 : host->dnssec == DS_NO ? US"no"
3686 /* Set up a string for adding to the retry key if the port number is not
3687 the standard SMTP port. A host may have its own port setting that overrides
3690 pistring = string_sprintf(":%d", host->port == PORT_NONE
3691 ? port : host->port);
3692 if (Ustrcmp(pistring, ":25") == 0) pistring = US"";
3694 /* Select IPv4 or IPv6, and choose an outgoing interface. If the interface
3695 string is set, even if constant (as different transports can have different
3696 constant settings), we must add it to the key that is used for retries,
3697 because connections to the same host from a different interface should be
3698 treated separately. */
3700 host_af = Ustrchr(host->address, ':') == NULL ? AF_INET : AF_INET6;
3701 if ((rs = ob->interface) && *rs)
3703 if (!smtp_get_interface(rs, host_af, addrlist, &interface, tid))
3705 pistring = string_sprintf("%s/%s", pistring, interface);
3708 /* The first time round the outer loop, check the status of the host by
3709 inspecting the retry data. The second time round, we are interested only
3710 in expired hosts that haven't been tried since this message arrived. */
3712 if (cutoff_retry == 0)
3715 /* Ensure the status of the address is set by checking retry data if
3716 necessary. There may be host-specific retry data (applicable to all
3717 messages) and also data for retries of a specific message at this host.
3718 If either of these retry records are actually read, the keys used are
3719 returned to save recomputing them later. */
3721 if (exp_bool(addrlist, US"transport", tblock->name, D_transport,
3722 US"retry_include_ip_address", ob->retry_include_ip_address,
3723 ob->expand_retry_include_ip_address, &incl_ip) != OK)
3724 continue; /* with next host */
3726 host_is_expired = retry_check_address(addrlist->domain, host, pistring,
3727 incl_ip, &retry_host_key, &retry_message_key);
3729 DEBUG(D_transport) debug_printf("%s [%s]%s status = %s\n", host->name,
3730 (host->address == NULL)? US"" : host->address, pistring,
3731 (host->status == hstatus_usable)? "usable" :
3732 (host->status == hstatus_unusable)? "unusable" :
3733 (host->status == hstatus_unusable_expired)? "unusable (expired)" : "?");
3735 /* Skip this address if not usable at this time, noting if it wasn't
3736 actually expired, both locally and in the address. */
3738 switch (host->status)
3740 case hstatus_unusable:
3742 setflag(addrlist, af_retry_skipped);
3745 case hstatus_unusable_expired:
3748 case hwhy_retry: hosts_retry++; break;
3749 case hwhy_failed: hosts_fail++; break;
3750 case hwhy_deferred: hosts_defer++; break;
3753 /* If there was a retry message key, implying that previously there
3754 was a message-specific defer, we don't want to update the list of
3755 messages waiting for these hosts. */
3757 if (retry_message_key) update_waiting = FALSE;
3758 continue; /* With the next host or IP address */
3762 /* Second time round the loop: if the address is set but expired, and
3763 the message is newer than the last try, let it through. */
3768 || host->status != hstatus_unusable_expired
3769 || host->last_try > received_time)
3771 DEBUG(D_transport) debug_printf("trying expired host %s [%s]%s\n",
3772 host->name, host->address, pistring);
3773 host_is_expired = TRUE;
3776 /* Setting "expired=FALSE" doesn't actually mean not all hosts are expired;
3777 it remains TRUE only if all hosts are expired and none are actually tried.
3782 /* If this host is listed as one to which access must be serialized,
3783 see if another Exim process has a connection to it, and if so, skip
3784 this host. If not, update the database to record our connection to it
3785 and remember this for later deletion. Do not do any of this if we are
3786 sending the message down a pre-existing connection. */
3788 if ( !continue_hostname
3789 && verify_check_given_host(&ob->serialize_hosts, host) == OK)
3791 serialize_key = string_sprintf("host-serialize-%s", host->name);
3792 if (!enq_start(serialize_key, 1))
3795 debug_printf("skipping host %s because another Exim process "
3796 "is connected to it\n", host->name);
3802 /* OK, we have an IP address that is not waiting for its retry time to
3803 arrive (it might be expired) OR (second time round the loop) we have an
3804 expired host that hasn't been tried since the message arrived. Have a go
3805 at delivering the message to it. First prepare the addresses by flushing
3806 out the result of previous attempts, and finding the first address that
3807 is still to be delivered. */
3809 first_addr = prepare_addresses(addrlist, host);
3811 DEBUG(D_transport) debug_printf("delivering %s to %s [%s] (%s%s)\n",
3812 message_id, host->name, host->address, addrlist->address,
3813 addrlist->next ? ", ..." : "");
3815 set_process_info("delivering %s to %s [%s] (%s%s)",
3816 message_id, host->name, host->address, addrlist->address,
3817 addrlist->next ? ", ..." : "");
3819 /* This is not for real; don't do the delivery. If there are
3820 any remaining hosts, list them. */
3825 set_errno_nohost(addrlist, 0, NULL, OK, FALSE);
3826 for (addr = addrlist; addr; addr = addr->next)
3828 addr->host_used = host;
3829 addr->special_action = '*';
3830 addr->message = US"delivery bypassed by -N option";
3834 debug_printf("*** delivery by %s transport bypassed by -N option\n"
3835 "*** host and remaining hosts:\n", tblock->name);
3836 for (host2 = host; host2; host2 = host2->next)
3837 debug_printf(" %s [%s]\n", host2->name,
3838 host2->address ? host2->address : US"unset");
3843 /* This is for real. If the host is expired, we don't count it for
3844 hosts_max_retry. This ensures that all hosts must expire before an address
3845 is timed out, unless hosts_max_try_hardlimit (which protects against
3846 lunatic DNS configurations) is reached.
3848 If the host is not expired and we are about to hit the hosts_max_retry
3849 limit, check to see if there is a subsequent hosts with a different MX
3850 value. If so, make that the next host, and don't count this one. This is a
3851 heuristic to make sure that different MXs do get tried. With a normal kind
3852 of retry rule, they would get tried anyway when the earlier hosts were
3853 delayed, but if the domain has a "retry every time" type of rule - as is
3854 often used for the the very large ISPs, that won't happen. */
3859 /* Make a copy of the host if it is local to this invocation
3860 of the transport. */
3864 thost = store_get(sizeof(host_item));
3866 thost->name = string_copy(host->name);
3867 thost->address = string_copy(host->address);
3872 if (!host_is_expired && ++unexpired_hosts_tried >= ob->hosts_max_try)
3876 debug_printf("hosts_max_try limit reached with this host\n");
3877 for (h = host; h; h = h->next) if (h->mx != host->mx)
3880 unexpired_hosts_tried--;
3881 DEBUG(D_transport) debug_printf("however, a higher MX host exists "
3882 "and will be tried\n");
3887 /* Attempt the delivery. */
3889 total_hosts_tried++;
3890 rc = smtp_deliver(addrlist, thost, host_af, port, interface, tblock,
3891 &message_defer, FALSE);
3894 OK => connection made, each address contains its result;
3895 message_defer is set for message-specific defers (when all
3896 recipients are marked defer)
3897 DEFER => there was a non-message-specific delivery problem;
3898 ERROR => there was a problem setting up the arguments for a filter,
3899 or there was a problem with expanding added headers
3902 /* If the result is not OK, there was a non-message-specific problem.
3903 If the result is DEFER, we need to write to the logs saying what happened
3904 for this particular host, except in the case of authentication and TLS
3905 failures, where the log has already been written. If all hosts defer a
3906 general message is written at the end. */
3908 if (rc == DEFER && first_addr->basic_errno != ERRNO_AUTHFAIL
3909 && first_addr->basic_errno != ERRNO_TLSFAILURE)
3910 write_logs(first_addr, host);
3912 #ifndef DISABLE_EVENT
3914 deferred_event_raise(first_addr, host);
3917 /* If STARTTLS was accepted, but there was a failure in setting up the
3918 TLS session (usually a certificate screwup), and the host is not in
3919 hosts_require_tls, and tls_tempfail_tryclear is true, try again, with
3920 TLS forcibly turned off. We have to start from scratch with a new SMTP
3921 connection. That's why the retry is done from here, not from within
3922 smtp_deliver(). [Rejections of STARTTLS itself don't screw up the
3923 session, so the in-clear transmission after those errors, if permitted,
3924 happens inside smtp_deliver().] */
3928 && first_addr->basic_errno == ERRNO_TLSFAILURE
3929 && ob->tls_tempfail_tryclear
3930 && verify_check_given_host(&ob->hosts_require_tls, host) != OK
3933 log_write(0, LOG_MAIN, "TLS session failure: delivering unencrypted "
3934 "to %s [%s] (not in hosts_require_tls)", host->name, host->address);
3935 first_addr = prepare_addresses(addrlist, host);
3936 rc = smtp_deliver(addrlist, thost, host_af, port, interface, tblock,
3937 &message_defer, TRUE);
3938 if (rc == DEFER && first_addr->basic_errno != ERRNO_AUTHFAIL)
3939 write_logs(first_addr, host);
3940 # ifndef DISABLE_EVENT
3942 deferred_event_raise(first_addr, host);
3945 #endif /*SUPPORT_TLS*/
3948 /* Delivery attempt finished */
3950 rs = rc == OK ? US"OK"
3951 : rc == DEFER ? US"DEFER"
3952 : rc == ERROR ? US"ERROR"
3955 set_process_info("delivering %s: just tried %s [%s] for %s%s: result %s",
3956 message_id, host->name, host->address, addrlist->address,
3957 addrlist->next ? " (& others)" : "", rs);
3959 /* Release serialization if set up */
3961 if (serialize_key) enq_end(serialize_key);
3963 /* If the result is DEFER, or if a host retry record is known to exist, we
3964 need to add an item to the retry chain for updating the retry database
3965 at the end of delivery. We only need to add the item to the top address,
3966 of course. Also, if DEFER, we mark the IP address unusable so as to skip it
3967 for any other delivery attempts using the same address. (It is copied into
3968 the unusable tree at the outer level, so even if different address blocks
3969 contain the same address, it still won't get tried again.) */
3971 if (rc == DEFER || retry_host_key)
3973 int delete_flag = rc != DEFER ? rf_delete : 0;
3974 if (!retry_host_key)
3977 if (exp_bool(addrlist, US"transport", tblock->name, D_transport,
3978 US"retry_include_ip_address", ob->retry_include_ip_address,
3979 ob->expand_retry_include_ip_address, &incl_ip) != OK)
3980 incl_ip = TRUE; /* error; use most-specific retry record */
3982 retry_host_key = incl_ip
3983 ? string_sprintf("T:%S:%s%s", host->name, host->address, pistring)
3984 : string_sprintf("T:%S%s", host->name, pistring);
3987 /* If a delivery of another message over an existing SMTP connection
3988 yields DEFER, we do NOT set up retry data for the host. This covers the
3989 case when there are delays in routing the addresses in the second message
3990 that are so long that the server times out. This is alleviated by not
3991 routing addresses that previously had routing defers when handling an
3992 existing connection, but even so, this case may occur (e.g. if a
3993 previously happily routed address starts giving routing defers). If the
3994 host is genuinely down, another non-continued message delivery will
3995 notice it soon enough. */
3997 if (delete_flag != 0 || !continue_hostname)
3998 retry_add_item(first_addr, retry_host_key, rf_host | delete_flag);
4000 /* We may have tried an expired host, if its retry time has come; ensure
4001 the status reflects the expiry for the benefit of any other addresses. */
4005 host->status = host_is_expired
4006 ? hstatus_unusable_expired : hstatus_unusable;
4007 host->why = hwhy_deferred;
4011 /* If message_defer is set (host was OK, but every recipient got deferred
4012 because of some message-specific problem), or if that had happened
4013 previously so that a message retry key exists, add an appropriate item
4014 to the retry chain. Note that if there was a message defer but now there is
4015 a host defer, the message defer record gets deleted. That seems perfectly
4016 reasonable. Also, stop the message from being remembered as waiting
4017 for specific hosts. */
4019 if (message_defer || retry_message_key)
4021 int delete_flag = message_defer ? 0 : rf_delete;
4022 if (!retry_message_key)
4025 if (exp_bool(addrlist, US"transport", tblock->name, D_transport,
4026 US"retry_include_ip_address", ob->retry_include_ip_address,
4027 ob->expand_retry_include_ip_address, &incl_ip) != OK)
4028 incl_ip = TRUE; /* error; use most-specific retry record */
4030 retry_message_key = incl_ip
4031 ? string_sprintf("T:%S:%s%s:%s", host->name, host->address, pistring,
4033 : string_sprintf("T:%S%s:%s", host->name, pistring, message_id);
4035 retry_add_item(addrlist, retry_message_key,
4036 rf_message | rf_host | delete_flag);
4037 update_waiting = FALSE;
4040 /* Any return other than DEFER (that is, OK or ERROR) means that the
4041 addresses have got their final statuses filled in for this host. In the OK
4042 case, see if any of them are deferred. */
4045 for (addr = addrlist; addr; addr = addr->next)
4046 if (addr->transport_return == DEFER)
4048 some_deferred = TRUE;
4052 /* If no addresses deferred or the result was ERROR, return. We do this for
4053 ERROR because a failing filter set-up or add_headers expansion is likely to
4054 fail for any host we try. */
4056 if (rc == ERROR || (rc == OK && !some_deferred))
4058 DEBUG(D_transport) debug_printf("Leaving %s transport\n", tblock->name);
4059 return TRUE; /* Each address has its status */
4062 /* If the result was DEFER or some individual addresses deferred, let
4063 the loop run to try other hosts with the deferred addresses, except for the
4064 case when we were trying to deliver down an existing channel and failed.
4065 Don't try any other hosts in this case. */
4067 if (continue_hostname) break;
4069 /* If the whole delivery, or some individual addresses, were deferred and
4070 there are more hosts that could be tried, do not count this host towards
4071 the hosts_max_try limit if the age of the message is greater than the
4072 maximum retry time for this host. This means we may try try all hosts,
4073 ignoring the limit, when messages have been around for some time. This is
4074 important because if we don't try all hosts, the address will never time
4075 out. NOTE: this does not apply to hosts_max_try_hardlimit. */
4077 if ((rc == DEFER || some_deferred) && nexthost)
4080 retry_config *retry = retry_find_config(host->name, NULL, 0, 0);
4082 if (retry && retry->rules)
4084 retry_rule *last_rule;
4085 for (last_rule = retry->rules;
4087 last_rule = last_rule->next);
4088 timedout = time(NULL) - received_time > last_rule->timeout;
4090 else timedout = TRUE; /* No rule => timed out */
4094 unexpired_hosts_tried--;
4095 DEBUG(D_transport) debug_printf("temporary delivery error(s) override "
4096 "hosts_max_try (message older than host's retry time)\n");
4099 } /* End of loop for trying multiple hosts. */
4101 /* This is the end of the loop that repeats iff expired is TRUE and
4102 ob->delay_after_cutoff is FALSE. The second time round we will
4103 try those hosts that haven't been tried since the message arrived. */
4107 debug_printf("all IP addresses skipped or deferred at least one address\n");
4108 if (expired && !ob->delay_after_cutoff && cutoff_retry == 0)
4109 debug_printf("retrying IP addresses not tried since message arrived\n");
4114 /* Get here if all IP addresses are skipped or defer at least one address. In
4115 MUA wrapper mode, this will happen only for connection or other non-message-
4116 specific failures. Force the delivery status for all addresses to FAIL. */
4120 for (addr = addrlist; addr; addr = addr->next)
4121 addr->transport_return = FAIL;
4125 /* In the normal, non-wrapper case, add a standard message to each deferred
4126 address if there hasn't been an error, that is, if it hasn't actually been
4127 tried this time. The variable "expired" will be FALSE if any deliveries were
4128 actually tried, or if there was at least one host that was not expired. That
4129 is, it is TRUE only if no deliveries were tried and all hosts were expired. If
4130 a delivery has been tried, an error code will be set, and the failing of the
4131 message is handled by the retry code later.
4133 If queue_smtp is set, or this transport was called to send a subsequent message
4134 down an existing TCP/IP connection, and something caused the host not to be
4135 found, we end up here, but can detect these cases and handle them specially. */
4137 for (addr = addrlist; addr; addr = addr->next)
4139 /* If host is not NULL, it means that we stopped processing the host list
4140 because of hosts_max_try or hosts_max_try_hardlimit. In the former case, this
4141 means we need to behave as if some hosts were skipped because their retry
4142 time had not come. Specifically, this prevents the address from timing out.
4143 However, if we have hit hosts_max_try_hardlimit, we want to behave as if all
4144 hosts were tried. */
4147 if (total_hosts_tried >= ob->hosts_max_try_hardlimit)
4150 debug_printf("hosts_max_try_hardlimit reached: behave as if all "
4151 "hosts were tried\n");
4156 debug_printf("hosts_max_try limit caused some hosts to be skipped\n");
4157 setflag(addr, af_retry_skipped);
4160 if (queue_smtp) /* no deliveries attempted */
4162 addr->transport_return = DEFER;
4163 addr->basic_errno = 0;
4164 addr->message = US"SMTP delivery explicitly queued";
4167 else if ( addr->transport_return == DEFER
4168 && (addr->basic_errno == ERRNO_UNKNOWNERROR || addr->basic_errno == 0)
4172 addr->basic_errno = ERRNO_HRETRY;
4173 if (continue_hostname)
4174 addr->message = US"no host found for existing SMTP connection";
4177 setflag(addr, af_pass_message); /* This is not a security risk */
4178 addr->message = string_sprintf(
4179 "all hosts%s have been failing for a long time %s",
4180 addr->domain ? string_sprintf(" for '%s'", addr->domain) : US"",
4181 ob->delay_after_cutoff
4182 ? US"(and retry time not reached)"
4183 : US"and were last tried after this message arrived");
4185 /* If we are already using fallback hosts, or there are no fallback hosts
4186 defined, convert the result to FAIL to cause a bounce. */
4188 if (addr->host_list == addr->fallback_hosts || !addr->fallback_hosts)
4189 addr->transport_return = FAIL;
4194 if (hosts_retry == hosts_total)
4195 s = "retry time not reached for any host%s";
4196 else if (hosts_fail == hosts_total)
4197 s = "all host address lookups%s failed permanently";
4198 else if (hosts_defer == hosts_total)
4199 s = "all host address lookups%s failed temporarily";
4200 else if (hosts_serial == hosts_total)
4201 s = "connection limit reached for all hosts%s";
4202 else if (hosts_fail+hosts_defer == hosts_total)
4203 s = "all host address lookups%s failed";
4205 s = "some host address lookups failed and retry time "
4206 "not reached for other hosts or connection limit reached%s";
4208 addr->message = string_sprintf(s,
4209 addr->domain ? string_sprintf(" for '%s'", addr->domain) : US"");
4214 /* Update the database which keeps information about which messages are waiting
4215 for which hosts to become available. For some message-specific errors, the
4216 update_waiting flag is turned off because we don't want follow-on deliveries in
4217 those cases. If this transport instance is explicitly limited to one message
4218 per connection then follow-on deliveries are not possible and there's no need
4219 to create/update the per-transport wait-<transport_name> database. */
4221 if (update_waiting && tblock->connection_max_messages != 1)
4222 transport_update_waiting(hostlist, tblock->name);
4226 DEBUG(D_transport) debug_printf("Leaving %s transport\n", tblock->name);
4228 return TRUE; /* Each address has its status */
4233 /* End of transport/smtp.c */