1 /*************************************************
2 * Exim - an Internet mail transport agent *
3 *************************************************/
5 /* Copyright (c) University of Cambridge 1995 - 2018 */
6 /* See the file NOTICE for conditions of use and distribution. */
12 /* Options specific to the smtp transport. This transport also supports LMTP
13 over TCP/IP. The options must be in alphabetic order (note that "_" comes
14 before the lower case letters). Some live in the transport_instance block so as
15 to be publicly visible; these are flagged with opt_public. */
17 optionlist smtp_transport_options[] = {
18 { "*expand_multi_domain", opt_stringptr | opt_hidden | opt_public,
19 (void *)offsetof(transport_instance, expand_multi_domain) },
20 { "*expand_retry_include_ip_address", opt_stringptr | opt_hidden,
21 (void *)(offsetof(smtp_transport_options_block, expand_retry_include_ip_address)) },
23 { "address_retry_include_sender", opt_bool,
24 (void *)offsetof(smtp_transport_options_block, address_retry_include_sender) },
25 { "allow_localhost", opt_bool,
26 (void *)offsetof(smtp_transport_options_block, allow_localhost) },
27 #ifdef EXPERIMENTAL_ARC
28 { "arc_sign", opt_stringptr,
29 (void *)offsetof(smtp_transport_options_block, arc_sign) },
31 { "authenticated_sender", opt_stringptr,
32 (void *)offsetof(smtp_transport_options_block, authenticated_sender) },
33 { "authenticated_sender_force", opt_bool,
34 (void *)offsetof(smtp_transport_options_block, authenticated_sender_force) },
35 { "command_timeout", opt_time,
36 (void *)offsetof(smtp_transport_options_block, command_timeout) },
37 { "connect_timeout", opt_time,
38 (void *)offsetof(smtp_transport_options_block, connect_timeout) },
39 { "connection_max_messages", opt_int | opt_public,
40 (void *)offsetof(transport_instance, connection_max_messages) },
41 { "data_timeout", opt_time,
42 (void *)offsetof(smtp_transport_options_block, data_timeout) },
43 { "delay_after_cutoff", opt_bool,
44 (void *)offsetof(smtp_transport_options_block, delay_after_cutoff) },
46 { "dkim_canon", opt_stringptr,
47 (void *)offsetof(smtp_transport_options_block, dkim.dkim_canon) },
48 { "dkim_domain", opt_stringptr,
49 (void *)offsetof(smtp_transport_options_block, dkim.dkim_domain) },
50 { "dkim_hash", opt_stringptr,
51 (void *)offsetof(smtp_transport_options_block, dkim.dkim_hash) },
52 { "dkim_identity", opt_stringptr,
53 (void *)offsetof(smtp_transport_options_block, dkim.dkim_identity) },
54 { "dkim_private_key", opt_stringptr,
55 (void *)offsetof(smtp_transport_options_block, dkim.dkim_private_key) },
56 { "dkim_selector", opt_stringptr,
57 (void *)offsetof(smtp_transport_options_block, dkim.dkim_selector) },
58 { "dkim_sign_headers", opt_stringptr,
59 (void *)offsetof(smtp_transport_options_block, dkim.dkim_sign_headers) },
60 { "dkim_strict", opt_stringptr,
61 (void *)offsetof(smtp_transport_options_block, dkim.dkim_strict) },
63 { "dns_qualify_single", opt_bool,
64 (void *)offsetof(smtp_transport_options_block, dns_qualify_single) },
65 { "dns_search_parents", opt_bool,
66 (void *)offsetof(smtp_transport_options_block, dns_search_parents) },
67 { "dnssec_request_domains", opt_stringptr,
68 (void *)offsetof(smtp_transport_options_block, dnssec.request) },
69 { "dnssec_require_domains", opt_stringptr,
70 (void *)offsetof(smtp_transport_options_block, dnssec.require) },
71 { "dscp", opt_stringptr,
72 (void *)offsetof(smtp_transport_options_block, dscp) },
73 { "fallback_hosts", opt_stringptr,
74 (void *)offsetof(smtp_transport_options_block, fallback_hosts) },
75 { "final_timeout", opt_time,
76 (void *)offsetof(smtp_transport_options_block, final_timeout) },
77 { "gethostbyname", opt_bool,
78 (void *)offsetof(smtp_transport_options_block, gethostbyname) },
79 { "helo_data", opt_stringptr,
80 (void *)offsetof(smtp_transport_options_block, helo_data) },
81 { "hosts", opt_stringptr,
82 (void *)offsetof(smtp_transport_options_block, hosts) },
83 { "hosts_avoid_esmtp", opt_stringptr,
84 (void *)offsetof(smtp_transport_options_block, hosts_avoid_esmtp) },
85 { "hosts_avoid_pipelining", opt_stringptr,
86 (void *)offsetof(smtp_transport_options_block, hosts_avoid_pipelining) },
88 { "hosts_avoid_tls", opt_stringptr,
89 (void *)offsetof(smtp_transport_options_block, hosts_avoid_tls) },
91 { "hosts_max_try", opt_int,
92 (void *)offsetof(smtp_transport_options_block, hosts_max_try) },
93 { "hosts_max_try_hardlimit", opt_int,
94 (void *)offsetof(smtp_transport_options_block, hosts_max_try_hardlimit) },
96 { "hosts_nopass_tls", opt_stringptr,
97 (void *)offsetof(smtp_transport_options_block, hosts_nopass_tls) },
98 { "hosts_noproxy_tls", opt_stringptr,
99 (void *)offsetof(smtp_transport_options_block, hosts_noproxy_tls) },
101 { "hosts_override", opt_bool,
102 (void *)offsetof(smtp_transport_options_block, hosts_override) },
103 { "hosts_randomize", opt_bool,
104 (void *)offsetof(smtp_transport_options_block, hosts_randomize) },
105 #if defined(SUPPORT_TLS) && !defined(DISABLE_OCSP)
106 { "hosts_request_ocsp", opt_stringptr,
107 (void *)offsetof(smtp_transport_options_block, hosts_request_ocsp) },
109 { "hosts_require_auth", opt_stringptr,
110 (void *)offsetof(smtp_transport_options_block, hosts_require_auth) },
113 { "hosts_require_dane", opt_stringptr,
114 (void *)offsetof(smtp_transport_options_block, hosts_require_dane) },
116 # ifndef DISABLE_OCSP
117 { "hosts_require_ocsp", opt_stringptr,
118 (void *)offsetof(smtp_transport_options_block, hosts_require_ocsp) },
120 { "hosts_require_tls", opt_stringptr,
121 (void *)offsetof(smtp_transport_options_block, hosts_require_tls) },
123 { "hosts_try_auth", opt_stringptr,
124 (void *)offsetof(smtp_transport_options_block, hosts_try_auth) },
125 { "hosts_try_chunking", opt_stringptr,
126 (void *)offsetof(smtp_transport_options_block, hosts_try_chunking) },
127 #if defined(SUPPORT_TLS) && defined(SUPPORT_DANE)
128 { "hosts_try_dane", opt_stringptr,
129 (void *)offsetof(smtp_transport_options_block, hosts_try_dane) },
131 { "hosts_try_fastopen", opt_stringptr,
132 (void *)offsetof(smtp_transport_options_block, hosts_try_fastopen) },
134 { "hosts_try_prdr", opt_stringptr,
135 (void *)offsetof(smtp_transport_options_block, hosts_try_prdr) },
138 { "hosts_verify_avoid_tls", opt_stringptr,
139 (void *)offsetof(smtp_transport_options_block, hosts_verify_avoid_tls) },
141 { "interface", opt_stringptr,
142 (void *)offsetof(smtp_transport_options_block, interface) },
143 { "keepalive", opt_bool,
144 (void *)offsetof(smtp_transport_options_block, keepalive) },
145 { "lmtp_ignore_quota", opt_bool,
146 (void *)offsetof(smtp_transport_options_block, lmtp_ignore_quota) },
147 { "max_rcpt", opt_int | opt_public,
148 (void *)offsetof(transport_instance, max_addresses) },
149 { "multi_domain", opt_expand_bool | opt_public,
150 (void *)offsetof(transport_instance, multi_domain) },
151 { "port", opt_stringptr,
152 (void *)offsetof(smtp_transport_options_block, port) },
153 { "protocol", opt_stringptr,
154 (void *)offsetof(smtp_transport_options_block, protocol) },
155 { "retry_include_ip_address", opt_expand_bool,
156 (void *)offsetof(smtp_transport_options_block, retry_include_ip_address) },
157 { "serialize_hosts", opt_stringptr,
158 (void *)offsetof(smtp_transport_options_block, serialize_hosts) },
159 { "size_addition", opt_int,
160 (void *)offsetof(smtp_transport_options_block, size_addition) }
162 ,{ "socks_proxy", opt_stringptr,
163 (void *)offsetof(smtp_transport_options_block, socks_proxy) }
166 ,{ "tls_certificate", opt_stringptr,
167 (void *)offsetof(smtp_transport_options_block, tls_certificate) },
168 { "tls_crl", opt_stringptr,
169 (void *)offsetof(smtp_transport_options_block, tls_crl) },
170 { "tls_dh_min_bits", opt_int,
171 (void *)offsetof(smtp_transport_options_block, tls_dh_min_bits) },
172 { "tls_privatekey", opt_stringptr,
173 (void *)offsetof(smtp_transport_options_block, tls_privatekey) },
174 { "tls_require_ciphers", opt_stringptr,
175 (void *)offsetof(smtp_transport_options_block, tls_require_ciphers) },
176 { "tls_sni", opt_stringptr,
177 (void *)offsetof(smtp_transport_options_block, tls_sni) },
178 { "tls_tempfail_tryclear", opt_bool,
179 (void *)offsetof(smtp_transport_options_block, tls_tempfail_tryclear) },
180 { "tls_try_verify_hosts", opt_stringptr,
181 (void *)offsetof(smtp_transport_options_block, tls_try_verify_hosts) },
182 { "tls_verify_cert_hostnames", opt_stringptr,
183 (void *)offsetof(smtp_transport_options_block,tls_verify_cert_hostnames)},
184 { "tls_verify_certificates", opt_stringptr,
185 (void *)offsetof(smtp_transport_options_block, tls_verify_certificates) },
186 { "tls_verify_hosts", opt_stringptr,
187 (void *)offsetof(smtp_transport_options_block, tls_verify_hosts) }
191 /* Size of the options list. An extern variable has to be used so that its
192 address can appear in the tables drtables.c. */
194 int smtp_transport_options_count =
195 sizeof(smtp_transport_options)/sizeof(optionlist);
201 smtp_transport_options_block smtp_transport_option_defaults = {0};
202 void smtp_transport_init(transport_instance *tblock) {}
203 BOOL smtp_transport_entry(transport_instance *tblock, address_item *addr) {return FALSE;}
204 void smtp_transport_closedown(transport_instance *tblock) {}
206 #else /*!MACRO_PREDEF*/
209 /* Default private options block for the smtp transport. */
211 smtp_transport_options_block smtp_transport_option_defaults = {
213 .fallback_hosts = NULL,
215 .fallback_hostlist = NULL,
216 .helo_data = US"$primary_hostname",
219 .protocol = US"smtp",
221 .serialize_hosts = NULL,
222 .hosts_try_auth = NULL,
223 .hosts_require_auth = NULL,
224 .hosts_try_chunking = US"*",
226 .hosts_try_dane = NULL,
227 .hosts_require_dane = NULL,
229 .hosts_try_fastopen = NULL,
231 .hosts_try_prdr = US"*",
234 .hosts_request_ocsp = US"*", /* hosts_request_ocsp (except under DANE; tls_client_start()) */
235 .hosts_require_ocsp = NULL,
237 .hosts_require_tls = NULL,
238 .hosts_avoid_tls = NULL,
239 .hosts_verify_avoid_tls = NULL,
240 .hosts_avoid_pipelining = NULL,
241 .hosts_avoid_esmtp = NULL,
243 .hosts_nopass_tls = NULL,
244 .hosts_noproxy_tls = US"*",
246 .command_timeout = 5*60,
247 .connect_timeout = 5*60,
248 .data_timeout = 5*60,
249 .final_timeout = 10*60,
250 .size_addition = 1024,
252 .hosts_max_try_hardlimit = 50,
253 .address_retry_include_sender = TRUE,
254 .allow_localhost = FALSE,
255 .authenticated_sender_force = FALSE,
256 .gethostbyname = FALSE,
257 .dns_qualify_single = TRUE,
258 .dns_search_parents = FALSE,
259 .dnssec = { .request=NULL, .require=NULL },
260 .delay_after_cutoff = TRUE,
261 .hosts_override = FALSE,
262 .hosts_randomize = FALSE,
264 .lmtp_ignore_quota = FALSE,
265 .expand_retry_include_ip_address = NULL,
266 .retry_include_ip_address = TRUE,
271 .tls_certificate = NULL,
273 .tls_privatekey = NULL,
274 .tls_require_ciphers = NULL,
276 .tls_verify_certificates = US"system",
277 .tls_dh_min_bits = EXIM_CLIENT_DH_DEFAULT_MIN_BITS,
278 .tls_tempfail_tryclear = TRUE,
279 .tls_verify_hosts = NULL,
280 .tls_try_verify_hosts = US"*",
281 .tls_verify_cert_hostnames = US"*",
285 {.dkim_domain = NULL,
286 .dkim_identity = NULL,
287 .dkim_private_key = NULL,
288 .dkim_selector = NULL,
290 .dkim_sign_headers = NULL,
292 .dkim_hash = US"sha256",
293 .dot_stuffed = FALSE,
294 .force_bodyhash = FALSE,
295 # ifdef EXPERIMENTAL_ARC
296 .arc_signspec = NULL,
299 # ifdef EXPERIMENTAL_ARC
305 /* some DSN flags for use later */
307 static int rf_list[] = {rf_notify_never, rf_notify_success,
308 rf_notify_failure, rf_notify_delay };
310 static uschar *rf_names[] = { US"NEVER", US"SUCCESS", US"FAILURE", US"DELAY" };
316 static uschar *smtp_command; /* Points to last cmd for error messages */
317 static uschar *mail_command; /* Points to MAIL cmd for error messages */
318 static uschar *data_command = US""; /* Points to DATA cmd for error messages */
319 static BOOL update_waiting; /* TRUE to update the "wait" database */
321 /*XXX move to smtp_context */
322 static BOOL pipelining_active; /* current transaction is in pipe mode */
325 /*************************************************
326 * Setup entry point *
327 *************************************************/
329 /* This function is called when the transport is about to be used,
330 but before running it in a sub-process. It is used for two things:
332 (1) To set the fallback host list in addresses, when delivering.
333 (2) To pass back the interface, port, protocol, and other options, for use
334 during callout verification.
337 tblock pointer to the transport instance block
338 addrlist list of addresses about to be transported
339 tf if not NULL, pointer to block in which to return options
340 uid the uid that will be set (not used)
341 gid the gid that will be set (not used)
342 errmsg place for error message (not used)
344 Returns: OK always (FAIL, DEFER not used)
348 smtp_transport_setup(transport_instance *tblock, address_item *addrlist,
349 transport_feedback *tf, uid_t uid, gid_t gid, uschar **errmsg)
351 smtp_transport_options_block *ob =
352 (smtp_transport_options_block *)(tblock->options_block);
354 errmsg = errmsg; /* Keep picky compilers happy */
358 /* Pass back options if required. This interface is getting very messy. */
362 tf->interface = ob->interface;
364 tf->protocol = ob->protocol;
365 tf->hosts = ob->hosts;
366 tf->hosts_override = ob->hosts_override;
367 tf->hosts_randomize = ob->hosts_randomize;
368 tf->gethostbyname = ob->gethostbyname;
369 tf->qualify_single = ob->dns_qualify_single;
370 tf->search_parents = ob->dns_search_parents;
371 tf->helo_data = ob->helo_data;
374 /* Set the fallback host list for all the addresses that don't have fallback
375 host lists, provided that the local host wasn't present in the original host
378 if (!testflag(addrlist, af_local_host_removed))
379 for (; addrlist; addrlist = addrlist->next)
380 if (!addrlist->fallback_hosts) addrlist->fallback_hosts = ob->fallback_hostlist;
387 /*************************************************
388 * Initialization entry point *
389 *************************************************/
391 /* Called for each instance, after its options have been read, to
392 enable consistency checks to be done, or anything else that needs
395 Argument: pointer to the transport instance block
400 smtp_transport_init(transport_instance *tblock)
402 smtp_transport_options_block *ob =
403 (smtp_transport_options_block *)(tblock->options_block);
405 /* Retry_use_local_part defaults FALSE if unset */
407 if (tblock->retry_use_local_part == TRUE_UNSET)
408 tblock->retry_use_local_part = FALSE;
410 /* Set the default port according to the protocol */
412 if (ob->port == NULL)
413 ob->port = (strcmpic(ob->protocol, US"lmtp") == 0)? US"lmtp" :
414 (strcmpic(ob->protocol, US"smtps") == 0)? US"smtps" : US"smtp";
416 /* Set up the setup entry point, to be called before subprocesses for this
419 tblock->setup = smtp_transport_setup;
421 /* Complain if any of the timeouts are zero. */
423 if (ob->command_timeout <= 0 || ob->data_timeout <= 0 ||
424 ob->final_timeout <= 0)
425 log_write(0, LOG_PANIC_DIE|LOG_CONFIG,
426 "command, data, or final timeout value is zero for %s transport",
429 /* If hosts_override is set and there are local hosts, set the global
430 flag that stops verify from showing router hosts. */
432 if (ob->hosts_override && ob->hosts != NULL) tblock->overrides_hosts = TRUE;
434 /* If there are any fallback hosts listed, build a chain of host items
435 for them, but do not do any lookups at this time. */
437 host_build_hostlist(&(ob->fallback_hostlist), ob->fallback_hosts, FALSE);
444 /*************************************************
445 * Set delivery info into all active addresses *
446 *************************************************/
448 /* Only addresses whose status is >= PENDING are relevant. A lesser
449 status means that an address is not currently being processed.
452 addrlist points to a chain of addresses
453 errno_value to put in each address's errno field
454 msg to put in each address's message field
455 rc to put in each address's transport_return field
456 pass_message if TRUE, set the "pass message" flag in the address
457 host if set, mark addrs as having used this host
458 smtp_greeting from peer
459 helo_response from peer
461 If errno_value has the special value ERRNO_CONNECTTIMEOUT, ETIMEDOUT is put in
462 the errno field, and RTEF_CTOUT is ORed into the more_errno field, to indicate
463 this particular type of timeout.
469 set_errno(address_item *addrlist, int errno_value, uschar *msg, int rc,
470 BOOL pass_message, host_item * host
471 #ifdef EXPERIMENTAL_DSN_INFO
472 , const uschar * smtp_greeting, const uschar * helo_response
478 if (errno_value == ERRNO_CONNECTTIMEOUT)
480 errno_value = ETIMEDOUT;
481 orvalue = RTEF_CTOUT;
483 for (addr = addrlist; addr; addr = addr->next)
484 if (addr->transport_return >= PENDING)
486 addr->basic_errno = errno_value;
487 addr->more_errno |= orvalue;
491 if (pass_message) setflag(addr, af_pass_message);
493 addr->transport_return = rc;
496 addr->host_used = host;
497 #ifdef EXPERIMENTAL_DSN_INFO
499 {uschar * s = Ustrchr(smtp_greeting, '\n'); if (s) *s = '\0';}
500 addr->smtp_greeting = smtp_greeting;
503 {uschar * s = Ustrchr(helo_response, '\n'); if (s) *s = '\0';}
504 addr->helo_response = helo_response;
511 set_errno_nohost(address_item *addrlist, int errno_value, uschar *msg, int rc,
514 set_errno(addrlist, errno_value, msg, rc, pass_message, NULL
515 #ifdef EXPERIMENTAL_DSN_INFO
522 /*************************************************
523 * Check an SMTP response *
524 *************************************************/
526 /* This function is given an errno code and the SMTP response buffer
527 to analyse, together with the host identification for generating messages. It
528 sets an appropriate message and puts the first digit of the response code into
529 the yield variable. If no response was actually read, a suitable digit is
533 host the current host, to get its name for messages
534 errno_value pointer to the errno value
535 more_errno from the top address for use with ERRNO_FILTER_FAIL
536 buffer the SMTP response buffer
537 yield where to put a one-digit SMTP response code
538 message where to put an error message
539 pass_message set TRUE if message is an SMTP response
541 Returns: TRUE if an SMTP "QUIT" command should be sent, else FALSE
545 check_response(host_item *host, int *errno_value, int more_errno,
546 uschar *buffer, int *yield, uschar **message, BOOL *pass_message)
548 uschar * pl = pipelining_active ? US"pipelined " : US"";
551 *yield = '4'; /* Default setting is to give a temporary error */
555 case ETIMEDOUT: /* Handle response timeout */
556 *message = US string_sprintf("SMTP timeout after %s%s",
558 if (transport_count > 0)
559 *message = US string_sprintf("%s (%d bytes written)", *message,
563 case ERRNO_SMTPFORMAT: /* Handle malformed SMTP response */
564 s = string_printing(buffer);
565 while (isspace(*s)) s++;
567 ? string_sprintf("Malformed SMTP reply (an empty line) "
568 "in response to %s%s", pl, smtp_command)
569 : string_sprintf("Malformed SMTP reply in response to %s%s: %s",
570 pl, smtp_command, s);
573 case ERRNO_FILTER_FAIL: /* Handle a failed filter process error;
574 can't send QUIT as we mustn't end the DATA. */
575 *message = string_sprintf("transport filter process failed (%d)%s",
577 more_errno == EX_EXECFAILED ? ": unable to execute command" : "");
580 case ERRNO_CHHEADER_FAIL: /* Handle a failed add_headers expansion;
581 can't send QUIT as we mustn't end the DATA. */
583 string_sprintf("failed to expand headers_add or headers_remove: %s",
584 expand_string_message);
587 case ERRNO_WRITEINCOMPLETE: /* failure to write a complete data block */
588 *message = string_sprintf("failed to write a data block");
592 case ERRNO_UTF8_FWD: /* no advertised SMTPUTF8, for international message */
593 *message = US"utf8 support required but not offered for forwarding";
594 DEBUG(D_deliver|D_transport) debug_printf("%s\n", *message);
599 /* Handle error responses from the remote mailer. */
603 *message = string_sprintf("SMTP error from remote mail server after %s%s: "
604 "%s", pl, smtp_command, s = string_printing(buffer));
605 *pass_message = TRUE;
610 /* No data was read. If there is no errno, this must be the EOF (i.e.
611 connection closed) case, which causes deferral. An explicit connection reset
612 error has the same effect. Otherwise, put the host's identity in the message,
613 leaving the errno value to be interpreted as well. In all cases, we have to
614 assume the connection is now dead. */
616 if (*errno_value == 0 || *errno_value == ECONNRESET)
618 *errno_value = ERRNO_SMTPCLOSED;
619 *message = US string_sprintf("Remote host closed connection "
620 "in response to %s%s", pl, smtp_command);
623 *message = US string_sprintf("%s [%s]", host->name, host->address);
630 /*************************************************
631 * Write error message to logs *
632 *************************************************/
634 /* This writes to the main log and to the message log.
637 host the current host
638 detail the current message (addr_item->message)
639 basic_errno the errno (addr_item->basic_errno)
645 write_logs(const host_item *host, const uschar *suffix, int basic_errno)
649 uschar *message = LOGGING(outgoing_port)
650 ? string_sprintf("H=%s [%s]:%d", host->name, host->address,
651 host->port == PORT_NONE ? 25 : host->port)
652 : string_sprintf("H=%s [%s]", host->name, host->address);
656 message = string_sprintf("%s: %s", message, suffix);
658 message = string_sprintf("%s: %s", message, strerror(basic_errno));
661 message = string_sprintf("%s %s", message, exim_errstr(basic_errno));
663 log_write(0, LOG_MAIN, "%s", message);
664 deliver_msglog("%s %s\n", tod_stamp(tod_log), message);
668 msglog_line(host_item * host, uschar * message)
670 deliver_msglog("%s H=%s [%s] %s\n", tod_stamp(tod_log),
671 host->name, host->address, message);
676 #ifndef DISABLE_EVENT
677 /*************************************************
678 * Post-defer action *
679 *************************************************/
681 /* This expands an arbitrary per-transport string.
682 It might, for example, be used to write to the database log.
685 addr the address item containing error information
686 host the current host
692 deferred_event_raise(address_item *addr, host_item *host)
694 uschar * action = addr->transport->event_action;
695 const uschar * save_domain;
701 save_domain = deliver_domain;
702 save_local = deliver_localpart;
704 /*XXX would ip & port already be set up? */
705 deliver_host_address = string_copy(host->address);
706 deliver_host_port = host->port == PORT_NONE ? 25 : host->port;
707 event_defer_errno = addr->basic_errno;
709 router_name = addr->router->name;
710 transport_name = addr->transport->name;
711 deliver_domain = addr->domain;
712 deliver_localpart = addr->local_part;
714 (void) event_raise(action, US"msg:host:defer",
716 ? addr->basic_errno > 0
717 ? string_sprintf("%s: %s", addr->message, strerror(addr->basic_errno))
718 : string_copy(addr->message)
719 : addr->basic_errno > 0
720 ? string_copy(US strerror(addr->basic_errno))
723 deliver_localpart = save_local;
724 deliver_domain = save_domain;
725 router_name = transport_name = NULL;
729 /*************************************************
730 * Synchronize SMTP responses *
731 *************************************************/
733 /* This function is called from smtp_deliver() to receive SMTP responses from
734 the server, and match them up with the commands to which they relate. When
735 PIPELINING is not in use, this function is called after every command, and is
736 therefore somewhat over-engineered, but it is simpler to use a single scheme
737 that works both with and without PIPELINING instead of having two separate sets
740 The set of commands that are buffered up with pipelining may start with MAIL
741 and may end with DATA; in between are RCPT commands that correspond to the
742 addresses whose status is PENDING_DEFER. All other commands (STARTTLS, AUTH,
743 etc.) are never buffered.
745 Errors after MAIL or DATA abort the whole process leaving the response in the
746 buffer. After MAIL, pending responses are flushed, and the original command is
747 re-instated in big_buffer for error messages. For RCPT commands, the remote is
748 permitted to reject some recipient addresses while accepting others. However
749 certain errors clearly abort the whole process. Set the value in
750 transport_return to PENDING_OK if the address is accepted. If there is a
751 subsequent general error, it will get reset accordingly. If not, it will get
752 converted to OK at the end.
755 sx smtp connection context
756 count the number of responses to read
757 pending_DATA 0 if last command sent was not DATA
758 +1 if previously had a good recipient
759 -1 if not previously had a good recipient
761 Returns: 3 if at least one address had 2xx and one had 5xx
762 2 if at least one address had 5xx but none had 2xx
763 1 if at least one host had a 2xx response, but none had 5xx
764 0 no address had 2xx or 5xx but no errors (all 4xx, or just DATA)
765 -1 timeout while reading RCPT response
766 -2 I/O or other non-response error for RCPT
767 -3 DATA or MAIL failed - errno and buffer set
771 sync_responses(smtp_context * sx, int count, int pending_DATA)
773 address_item *addr = sx->sync_addr;
774 smtp_transport_options_block *ob =
775 (smtp_transport_options_block *)sx->tblock->options_block;
778 /* Handle the response for a MAIL command. On error, reinstate the original
779 command in big_buffer for error message use, and flush any further pending
780 responses before returning, except after I/O errors and timeouts. */
782 if (sx->pending_MAIL)
785 if (!smtp_read_response(&sx->inblock, sx->buffer, sizeof(sx->buffer),
786 '2', ob->command_timeout))
788 DEBUG(D_transport) debug_printf("bad response for MAIL\n");
789 Ustrcpy(big_buffer, mail_command); /* Fits, because it came from there! */
790 if (errno == 0 && sx->buffer[0] != 0)
792 uschar flushbuffer[4096];
794 if (sx->buffer[0] == '4')
796 save_errno = ERRNO_MAIL4XX;
797 addr->more_errno |= ((sx->buffer[1] - '0')*10 + sx->buffer[2] - '0') << 8;
801 if (!smtp_read_response(&sx->inblock, flushbuffer, sizeof(flushbuffer),
802 '2', ob->command_timeout)
803 && (errno != 0 || flushbuffer[0] == 0))
809 if (pending_DATA) count--; /* Number of RCPT responses to come */
810 while (count-- > 0) /* Mark any pending addrs with the host used */
812 while (addr->transport_return != PENDING_DEFER) addr = addr->next;
813 addr->host_used = sx->host;
820 if (pending_DATA) count--; /* Number of RCPT responses to come */
822 /* Read and handle the required number of RCPT responses, matching each one up
823 with an address by scanning for the next address whose status is PENDING_DEFER.
828 while (addr->transport_return != PENDING_DEFER)
829 if (!(addr = addr->next))
832 /* The address was accepted */
833 addr->host_used = sx->host;
835 if (smtp_read_response(&sx->inblock, sx->buffer, sizeof(sx->buffer),
836 '2', ob->command_timeout))
839 addr->transport_return = PENDING_OK;
841 /* If af_dr_retry_exists is set, there was a routing delay on this address;
842 ensure that any address-specific retry record is expunged. We do this both
843 for the basic key and for the version that also includes the sender. */
845 if (testflag(addr, af_dr_retry_exists))
847 uschar *altkey = string_sprintf("%s:<%s>", addr->address_retry_key,
849 retry_add_item(addr, altkey, rf_delete);
850 retry_add_item(addr, addr->address_retry_key, rf_delete);
854 /* Timeout while reading the response */
856 else if (errno == ETIMEDOUT)
858 uschar *message = string_sprintf("SMTP timeout after RCPT TO:<%s>",
859 transport_rcpt_address(addr, sx->tblock->rcpt_include_affixes));
860 set_errno_nohost(sx->first_addr, ETIMEDOUT, message, DEFER, FALSE);
861 retry_add_item(addr, addr->address_retry_key, 0);
862 update_waiting = FALSE;
866 /* Handle other errors in obtaining an SMTP response by returning -1. This
867 will cause all the addresses to be deferred. Restore the SMTP command in
868 big_buffer for which we are checking the response, so the error message
871 else if (errno != 0 || sx->buffer[0] == 0)
873 string_format(big_buffer, big_buffer_size, "RCPT TO:<%s>",
874 transport_rcpt_address(addr, sx->tblock->rcpt_include_affixes));
878 /* Handle SMTP permanent and temporary response codes. */
883 string_sprintf("SMTP error from remote mail server after RCPT TO:<%s>: "
884 "%s", transport_rcpt_address(addr, sx->tblock->rcpt_include_affixes),
885 string_printing(sx->buffer));
886 setflag(addr, af_pass_message);
888 msglog_line(sx->host, addr->message);
890 /* The response was 5xx */
892 if (sx->buffer[0] == '5')
894 addr->transport_return = FAIL;
898 /* The response was 4xx */
902 addr->transport_return = DEFER;
903 addr->basic_errno = ERRNO_RCPT4XX;
904 addr->more_errno |= ((sx->buffer[1] - '0')*10 + sx->buffer[2] - '0') << 8;
908 #ifndef DISABLE_EVENT
909 event_defer_errno = addr->more_errno;
910 msg_event_raise(US"msg:rcpt:host:defer", addr);
913 /* Log temporary errors if there are more hosts to be tried.
914 If not, log this last one in the == line. */
917 log_write(0, LOG_MAIN, "H=%s [%s]: %s",
918 sx->host->name, sx->host->address, addr->message);
920 #ifndef DISABLE_EVENT
922 msg_event_raise(US"msg:rcpt:defer", addr);
925 /* Do not put this message on the list of those waiting for specific
926 hosts, as otherwise it is likely to be tried too often. */
928 update_waiting = FALSE;
930 /* Add a retry item for the address so that it doesn't get tried again
931 too soon. If address_retry_include_sender is true, add the sender address
935 ob->address_retry_include_sender
936 ? string_sprintf("%s:<%s>", addr->address_retry_key, sender_address)
937 : addr->address_retry_key,
942 } /* Loop for next RCPT response */
944 /* Update where to start at for the next block of responses, unless we
945 have already handled all the addresses. */
947 if (addr) sx->sync_addr = addr->next;
949 /* Handle a response to DATA. If we have not had any good recipients, either
950 previously or in this block, the response is ignored. */
952 if (pending_DATA != 0 &&
953 !smtp_read_response(&sx->inblock, sx->buffer, sizeof(sx->buffer),
954 '3', ob->command_timeout))
959 if (pending_DATA > 0 || (yield & 1) != 0)
961 if (errno == 0 && sx->buffer[0] == '4')
963 errno = ERRNO_DATA4XX;
964 sx->first_addr->more_errno |= ((sx->buffer[1] - '0')*10 + sx->buffer[2] - '0') << 8;
968 (void)check_response(sx->host, &errno, 0, sx->buffer, &code, &msg, &pass_message);
969 DEBUG(D_transport) debug_printf("%s\nerror for DATA ignored: pipelining "
970 "is in use and there were no good recipients\n", msg);
973 /* All responses read and handled; MAIL (if present) received 2xx and DATA (if
974 present) received 3xx. If any RCPTs were handled and yielded anything other
975 than 4xx, yield will be set non-zero. */
982 /* Do the client side of smtp-level authentication */
985 buffer EHLO response from server (gets overwritten)
986 addrlist chain of potential addresses to deliver
987 host host to deliver to
989 ibp, obp comms channel control blocks
992 OK Success, or failed (but not required): global "smtp_authenticated" set
993 DEFER Failed authentication (and was required)
994 ERROR Internal problem
996 FAIL_SEND Failed communications - transmit
1001 smtp_auth(uschar *buffer, unsigned bufsize, address_item *addrlist, host_item *host,
1002 smtp_transport_options_block *ob, BOOL is_esmtp,
1003 smtp_inblock *ibp, smtp_outblock *obp)
1006 uschar *fail_reason = US"server did not advertise AUTH support";
1008 smtp_authenticated = FALSE;
1009 client_authenticator = client_authenticated_id = client_authenticated_sender = NULL;
1010 require_auth = verify_check_given_host(&ob->hosts_require_auth, host);
1012 if (is_esmtp && !regex_AUTH) regex_AUTH =
1013 regex_must_compile(US"\\n250[\\s\\-]AUTH\\s+([\\-\\w\\s]+)(?:\\n|$)",
1016 if (is_esmtp && regex_match_and_setup(regex_AUTH, buffer, 0, -1))
1018 uschar *names = string_copyn(expand_nstring[1], expand_nlength[1]);
1019 expand_nmax = -1; /* reset */
1021 /* Must not do this check until after we have saved the result of the
1022 regex match above. */
1024 if (require_auth == OK ||
1025 verify_check_given_host(&ob->hosts_try_auth, host) == OK)
1028 fail_reason = US"no common mechanisms were found";
1030 DEBUG(D_transport) debug_printf("scanning authentication mechanisms\n");
1032 /* Scan the configured authenticators looking for one which is configured
1033 for use as a client, which is not suppressed by client_condition, and
1034 whose name matches an authentication mechanism supported by the server.
1035 If one is found, attempt to authenticate by calling its client function.
1038 for (au = auths; !smtp_authenticated && au; au = au->next)
1042 (au->client_condition != NULL &&
1043 !expand_check_condition(au->client_condition, au->name,
1044 US"client authenticator")))
1046 DEBUG(D_transport) debug_printf("skipping %s authenticator: %s\n",
1048 (au->client)? "client_condition is false" :
1049 "not configured as a client");
1053 /* Loop to scan supported server mechanisms */
1058 int len = Ustrlen(au->public_name);
1059 while (isspace(*p)) p++;
1061 if (strncmpic(au->public_name, p, len) != 0 ||
1062 (p[len] != 0 && !isspace(p[len])))
1064 while (*p != 0 && !isspace(*p)) p++;
1068 /* Found data for a listed mechanism. Call its client entry. Set
1069 a flag in the outblock so that data is overwritten after sending so
1070 that reflections don't show it. */
1072 fail_reason = US"authentication attempt(s) failed";
1073 obp->authenticating = TRUE;
1074 rc = (au->info->clientcode)(au, ibp, obp,
1075 ob->command_timeout, buffer, bufsize);
1076 obp->authenticating = FALSE;
1077 DEBUG(D_transport) debug_printf("%s authenticator yielded %d\n",
1080 /* A temporary authentication failure must hold up delivery to
1081 this host. After a permanent authentication failure, we carry on
1082 to try other authentication methods. If all fail hard, try to
1083 deliver the message unauthenticated unless require_auth was set. */
1088 smtp_authenticated = TRUE; /* stops the outer loop */
1089 client_authenticator = au->name;
1090 if (au->set_client_id != NULL)
1091 client_authenticated_id = expand_string(au->set_client_id);
1094 /* Failure after writing a command */
1099 /* Failure after reading a response */
1102 if (errno != 0 || buffer[0] != '5') return FAIL;
1103 log_write(0, LOG_MAIN, "%s authenticator failed H=%s [%s] %s",
1104 au->name, host->name, host->address, buffer);
1107 /* Failure by some other means. In effect, the authenticator
1108 decided it wasn't prepared to handle this case. Typically this
1109 is the result of "fail" in an expansion string. Do we need to
1110 log anything here? Feb 2006: a message is now put in the buffer
1111 if logging is required. */
1115 log_write(0, LOG_MAIN, "%s authenticator cancelled "
1116 "authentication H=%s [%s] %s", au->name, host->name,
1117 host->address, buffer);
1120 /* Internal problem, message in buffer. */
1123 set_errno_nohost(addrlist, ERRNO_AUTHPROB, string_copy(buffer),
1128 break; /* If not authenticated, try next authenticator */
1129 } /* Loop for scanning supported server mechanisms */
1130 } /* Loop for further authenticators */
1134 /* If we haven't authenticated, but are required to, give up. */
1136 if (require_auth == OK && !smtp_authenticated)
1138 set_errno_nohost(addrlist, ERRNO_AUTHFAIL,
1139 string_sprintf("authentication required but %s", fail_reason), DEFER,
1148 /* Construct AUTH appendix string for MAIL TO */
1151 buffer to build string
1152 addrlist chain of potential addresses to deliver
1153 ob transport options
1155 Globals smtp_authenticated
1156 client_authenticated_sender
1157 Return True on error, otherwise buffer has (possibly empty) terminated string
1161 smtp_mail_auth_str(uschar *buffer, unsigned bufsize, address_item *addrlist,
1162 smtp_transport_options_block *ob)
1164 uschar *local_authenticated_sender = authenticated_sender;
1167 debug_printf("smtp_mail_auth_str: as<%s> os<%s> SA<%s>\n", authenticated_sender, ob->authenticated_sender, smtp_authenticated?"Y":"N");
1170 if (ob->authenticated_sender != NULL)
1172 uschar *new = expand_string(ob->authenticated_sender);
1175 if (!expand_string_forcedfail)
1177 uschar *message = string_sprintf("failed to expand "
1178 "authenticated_sender: %s", expand_string_message);
1179 set_errno_nohost(addrlist, ERRNO_EXPANDFAIL, message, DEFER, FALSE);
1183 else if (new[0] != 0) local_authenticated_sender = new;
1186 /* Add the authenticated sender address if present */
1188 if ((smtp_authenticated || ob->authenticated_sender_force) &&
1189 local_authenticated_sender != NULL)
1191 string_format(buffer, bufsize, " AUTH=%s",
1192 auth_xtextencode(local_authenticated_sender,
1193 Ustrlen(local_authenticated_sender)));
1194 client_authenticated_sender = string_copy(local_authenticated_sender);
1205 /* Lookup TLSA record for host/port.
1206 Return: OK success with dnssec; DANE mode
1207 DEFER Do not use this host now, may retry later
1208 FAIL_FORCED No TLSA record; DANE not usable
1209 FAIL Do not use this connection
1213 tlsa_lookup(const host_item * host, dns_answer * dnsa, BOOL dane_required)
1215 /* move this out to host.c given the similarity to dns_lookup() ? */
1217 const uschar * fullname = buffer;
1221 /* TLSA lookup string */
1222 (void)sprintf(CS buffer, "_%d._tcp.%.256s", host->port, host->name);
1224 rc = dns_lookup(dnsa, buffer, T_TLSA, &fullname);
1225 sec = dns_is_secure(dnsa);
1227 debug_printf("TLSA lookup ret %d %sDNSSEC\n", rc, sec ? "" : "not ");
1232 return DEFER; /* just defer this TLS'd conn */
1236 log_write(0, LOG_MAIN,
1237 "DANE error: TLSA lookup for %s not DNSSEC", host->name);
1240 case DNS_NODATA: /* no TLSA RR for this lookup */
1241 case DNS_NOMATCH: /* no records at all for this lookup */
1242 return dane_required ? FAIL : FAIL_FORCED;
1246 return dane_required ? FAIL : DEFER;
1253 typedef struct smtp_compare_s
1255 uschar *current_sender_address;
1256 struct transport_instance *tblock;
1260 /* Create a unique string that identifies this message, it is based on
1261 sender_address, helo_data and tls_certificate if enabled.
1265 smtp_local_identity(uschar * sender, struct transport_instance * tblock)
1267 address_item * addr1;
1268 uschar * if1 = US"";
1269 uschar * helo1 = US"";
1271 uschar * tlsc1 = US"";
1273 uschar * save_sender_address = sender_address;
1274 uschar * local_identity = NULL;
1275 smtp_transport_options_block * ob =
1276 (smtp_transport_options_block *)tblock->options_block;
1278 sender_address = sender;
1280 addr1 = deliver_make_addr (sender, TRUE);
1281 deliver_set_expansions(addr1);
1284 if1 = expand_string(ob->interface);
1287 helo1 = expand_string(ob->helo_data);
1290 if (ob->tls_certificate)
1291 tlsc1 = expand_string(ob->tls_certificate);
1292 local_identity = string_sprintf ("%s^%s^%s", if1, helo1, tlsc1);
1294 local_identity = string_sprintf ("%s^%s", if1, helo1);
1297 deliver_set_expansions(NULL);
1298 sender_address = save_sender_address;
1300 return local_identity;
1305 /* This routine is a callback that is called from transport_check_waiting.
1306 This function will evaluate the incoming message versus the previous
1307 message. If the incoming message is using a different local identity then
1308 we will veto this new message. */
1311 smtp_are_same_identities(uschar * message_id, smtp_compare_t * s_compare)
1313 uschar * message_local_identity,
1314 * current_local_identity,
1315 * new_sender_address;
1317 current_local_identity =
1318 smtp_local_identity(s_compare->current_sender_address, s_compare->tblock);
1320 if (!(new_sender_address = deliver_get_sender_address(message_id)))
1323 message_local_identity =
1324 smtp_local_identity(new_sender_address, s_compare->tblock);
1326 return Ustrcmp(current_local_identity, message_local_identity) == 0;
1332 ehlo_response(uschar * buf, uschar checks)
1334 size_t bsize = Ustrlen(buf);
1337 if ( checks & OPTION_TLS
1338 && pcre_exec(regex_STARTTLS, NULL, CS buf, bsize, 0, PCRE_EOPT, NULL, 0) < 0)
1339 checks &= ~OPTION_TLS;
1342 if ( checks & OPTION_IGNQ
1343 && pcre_exec(regex_IGNOREQUOTA, NULL, CS buf, bsize, 0,
1344 PCRE_EOPT, NULL, 0) < 0)
1345 checks &= ~OPTION_IGNQ;
1347 if ( checks & OPTION_CHUNKING
1348 && pcre_exec(regex_CHUNKING, NULL, CS buf, bsize, 0, PCRE_EOPT, NULL, 0) < 0)
1349 checks &= ~OPTION_CHUNKING;
1351 #ifndef DISABLE_PRDR
1352 if ( checks & OPTION_PRDR
1353 && pcre_exec(regex_PRDR, NULL, CS buf, bsize, 0, PCRE_EOPT, NULL, 0) < 0)
1354 checks &= ~OPTION_PRDR;
1358 if ( checks & OPTION_UTF8
1359 && pcre_exec(regex_UTF8, NULL, CS buf, bsize, 0, PCRE_EOPT, NULL, 0) < 0)
1360 checks &= ~OPTION_UTF8;
1363 if ( checks & OPTION_DSN
1364 && pcre_exec(regex_DSN, NULL, CS buf, bsize, 0, PCRE_EOPT, NULL, 0) < 0)
1365 checks &= ~OPTION_DSN;
1367 if ( checks & OPTION_PIPE
1368 && pcre_exec(regex_PIPELINING, NULL, CS buf, bsize, 0,
1369 PCRE_EOPT, NULL, 0) < 0)
1370 checks &= ~OPTION_PIPE;
1372 if ( checks & OPTION_SIZE
1373 && pcre_exec(regex_SIZE, NULL, CS buf, bsize, 0, PCRE_EOPT, NULL, 0) < 0)
1374 checks &= ~OPTION_SIZE;
1381 /* Callback for emitting a BDAT data chunk header.
1383 If given a nonzero size, first flush any buffered SMTP commands
1384 then emit the command.
1386 Reap previous SMTP command responses if requested, and always reap
1387 the response from a previous BDAT command.
1390 tctx transport context
1391 chunk_size value for SMTP BDAT command
1393 tc_chunk_last add LAST option to SMTP BDAT command
1394 tc_reap_prev reap response to previous SMTP commands
1396 Returns: OK or ERROR
1400 smtp_chunk_cmd_callback(transport_ctx * tctx, unsigned chunk_size,
1403 smtp_transport_options_block * ob =
1404 (smtp_transport_options_block *)(tctx->tblock->options_block);
1405 smtp_context * sx = tctx->smtp_context;
1409 /* Write SMTP chunk header command. If not reaping responses, note that
1410 there may be more writes (like, the chunk data) done soon. */
1414 if((cmd_count = smtp_write_command(&sx->outblock,
1415 flags & tc_reap_prev ? SCMD_FLUSH : SCMD_MORE,
1416 "BDAT %u%s\r\n", chunk_size, flags & tc_chunk_last ? " LAST" : "")
1417 ) < 0) return ERROR;
1418 if (flags & tc_chunk_last)
1419 data_command = string_copy(big_buffer); /* Save for later error message */
1422 prev_cmd_count = cmd_count += sx->cmd_count;
1424 /* Reap responses for any previous, but not one we just emitted */
1428 if (sx->pending_BDAT)
1431 if (flags & tc_reap_prev && prev_cmd_count > 0)
1433 DEBUG(D_transport) debug_printf("look for %d responses"
1434 " for previous pipelined cmds\n", prev_cmd_count);
1436 switch(sync_responses(sx, prev_cmd_count, 0))
1438 case 1: /* 2xx (only) => OK */
1439 case 3: sx->good_RCPT = TRUE; /* 2xx & 5xx => OK & progress made */
1440 case 2: sx->completed_addr = TRUE; /* 5xx (only) => progress made */
1441 case 0: break; /* No 2xx or 5xx, but no probs */
1443 case -1: /* Timeout on RCPT */
1444 default: return ERROR; /* I/O error, or any MAIL/DATA error */
1447 if (!sx->pending_BDAT)
1448 pipelining_active = FALSE;
1451 /* Reap response for an outstanding BDAT */
1453 if (sx->pending_BDAT)
1455 DEBUG(D_transport) debug_printf("look for one response for BDAT\n");
1457 if (!smtp_read_response(&sx->inblock, sx->buffer, sizeof(sx->buffer), '2',
1458 ob->command_timeout))
1460 if (errno == 0 && sx->buffer[0] == '4')
1462 errno = ERRNO_DATA4XX; /*XXX does this actually get used? */
1463 sx->addrlist->more_errno |=
1464 ((sx->buffer[1] - '0')*10 + sx->buffer[2] - '0') << 8;
1469 sx->pending_BDAT = FALSE;
1470 pipelining_active = FALSE;
1472 else if (chunk_size > 0)
1473 sx->pending_BDAT = TRUE;
1476 sx->cmd_count = cmd_count;
1482 /*************************************************
1483 * Make connection for given message *
1484 *************************************************/
1488 ctx connection context
1489 suppress_tls if TRUE, don't attempt a TLS connection - this is set for
1490 a second attempt after TLS initialization fails
1492 Returns: OK - the connection was made and the delivery attempted;
1493 fd is set in the conn context, tls_out set up.
1494 DEFER - the connection could not be made, or something failed
1495 while setting up the SMTP session, or there was a
1496 non-message-specific error, such as a timeout.
1497 ERROR - helo_data or add_headers or authenticated_sender is
1498 specified for this transport, and the string failed
1502 smtp_setup_conn(smtp_context * sx, BOOL suppress_tls)
1504 #if defined(SUPPORT_TLS) && defined(SUPPORT_DANE)
1505 dns_answer tlsa_dnsa;
1507 BOOL pass_message = FALSE;
1508 uschar * message = NULL;
1512 sx->ob = (smtp_transport_options_block *) sx->tblock->options_block;
1514 sx->lmtp = strcmpic(sx->ob->protocol, US"lmtp") == 0;
1515 sx->smtps = strcmpic(sx->ob->protocol, US"smtps") == 0;
1517 sx->send_rset = TRUE;
1518 sx->send_quit = TRUE;
1519 sx->setting_up = TRUE;
1521 sx->esmtp_sent = FALSE;
1523 sx->utf8_needed = FALSE;
1525 sx->dsn_all_lasthop = TRUE;
1526 #if defined(SUPPORT_TLS) && defined(SUPPORT_DANE)
1528 sx->dane_required = verify_check_given_host(&sx->ob->hosts_require_dane, sx->host) == OK;
1531 if ((sx->max_rcpt = sx->tblock->max_addresses) == 0) sx->max_rcpt = 999999;
1532 sx->peer_offered = 0;
1533 sx->avoid_option = 0;
1534 sx->igquotstr = US"";
1535 if (!sx->helo_data) sx->helo_data = sx->ob->helo_data;
1536 #ifdef EXPERIMENTAL_DSN_INFO
1537 sx->smtp_greeting = NULL;
1538 sx->helo_response = NULL;
1541 smtp_command = US"initial connection";
1542 sx->buffer[0] = '\0';
1544 /* Set up the buffer for reading SMTP response packets. */
1546 sx->inblock.buffer = sx->inbuffer;
1547 sx->inblock.buffersize = sizeof(sx->inbuffer);
1548 sx->inblock.ptr = sx->inbuffer;
1549 sx->inblock.ptrend = sx->inbuffer;
1551 /* Set up the buffer for holding SMTP commands while pipelining */
1553 sx->outblock.buffer = sx->outbuffer;
1554 sx->outblock.buffersize = sizeof(sx->outbuffer);
1555 sx->outblock.ptr = sx->outbuffer;
1556 sx->outblock.cmd_count = 0;
1557 sx->outblock.authenticating = FALSE;
1559 /* Reset the parameters of a TLS session. */
1562 tls_out.cipher = NULL; /* the one we may use for this transport */
1563 tls_out.ourcert = NULL;
1564 tls_out.peercert = NULL;
1565 tls_out.peerdn = NULL;
1566 #if defined(SUPPORT_TLS) && !defined(USE_GNUTLS)
1569 tls_out.ocsp = OCSP_NOT_REQ;
1571 /* Flip the legacy TLS-related variables over to the outbound set in case
1572 they're used in the context of the transport. Don't bother resetting
1573 afterward (when being used by a transport) as we're in a subprocess.
1574 For verify, unflipped once the callout is dealt with */
1576 tls_modify_variables(&tls_out);
1581 set_errno_nohost(sx->addrlist, ERRNO_TLSFAILURE, US"TLS support not available",
1587 /* Make a connection to the host if this isn't a continued delivery, and handle
1588 the initial interaction and HELO/EHLO/LHLO. Connect timeout errors are handled
1589 specially so they can be identified for retries. */
1591 if (!continue_hostname)
1594 HDEBUG(D_verify) debug_printf("interface=%s port=%d\n", sx->interface, sx->port);
1596 /* Get the actual port the connection will use, into sx->host */
1598 smtp_port_for_connect(sx->host, sx->port);
1600 #if defined(SUPPORT_TLS) && defined(SUPPORT_DANE)
1601 /* Do TLSA lookup for DANE */
1603 tls_out.dane_verified = FALSE;
1604 tls_out.tlsa_usage = 0;
1606 if (sx->host->dnssec == DS_YES)
1608 if( sx->dane_required
1609 || verify_check_given_host(&sx->ob->hosts_try_dane, sx->host) == OK
1611 switch (rc = tlsa_lookup(sx->host, &tlsa_dnsa, sx->dane_required))
1613 case OK: sx->dane = TRUE;
1614 sx->ob->tls_tempfail_tryclear = FALSE;
1616 case FAIL_FORCED: break;
1617 default: set_errno_nohost(sx->addrlist, ERRNO_DNSDEFER,
1618 string_sprintf("DANE error: tlsa lookup %s",
1619 rc == DEFER ? "DEFER" : "FAIL"),
1624 else if (sx->dane_required)
1626 set_errno_nohost(sx->addrlist, ERRNO_DNSDEFER,
1627 string_sprintf("DANE error: %s lookup not DNSSEC", sx->host->name),
1634 /* Make the TCP connection */
1636 sx->inblock.sock = sx->outblock.sock =
1637 smtp_connect(sx->host, sx->host_af, sx->interface,
1638 sx->ob->connect_timeout, sx->tblock);
1640 if (sx->inblock.sock < 0)
1642 uschar * msg = NULL;
1645 msg = US strerror(errno);
1646 HDEBUG(D_verify) debug_printf("connect: %s\n", msg);
1648 set_errno_nohost(sx->addrlist,
1649 errno == ETIMEDOUT ? ERRNO_CONNECTTIMEOUT : errno,
1650 sx->verify ? string_sprintf("could not connect: %s", msg)
1653 sx->send_quit = FALSE;
1657 /* Expand the greeting message while waiting for the initial response. (Makes
1658 sense if helo_data contains ${lookup dnsdb ...} stuff). The expansion is
1659 delayed till here so that $sending_interface and $sending_port are set. */
1662 if (!(sx->helo_data = expand_string(sx->helo_data)))
1664 log_write(0, LOG_MAIN|LOG_PANIC,
1665 "<%s>: failed to expand transport's helo_data value for callout: %s",
1666 sx->addrlist->address, expand_string_message);
1671 expand_string_message = NULL;
1672 if ((sx->helo_data = string_domain_utf8_to_alabel(sx->helo_data,
1673 &expand_string_message)),
1674 expand_string_message)
1676 log_write(0, LOG_MAIN|LOG_PANIC,
1677 "<%s>: failed to expand transport's helo_data value for callout: %s",
1678 sx->addrlist->address, expand_string_message);
1680 sx->helo_data = NULL;
1684 /* The first thing is to wait for an initial OK response. The dreaded "goto"
1685 is nevertheless a reasonably clean way of programming this kind of logic,
1686 where you want to escape on any error. */
1693 (void) setsockopt(sx->inblock.sock, IPPROTO_TCP, TCP_QUICKACK, US &off, sizeof(off));
1695 good_response = smtp_read_response(&sx->inblock, sx->buffer, sizeof(sx->buffer),
1696 '2', sx->ob->command_timeout);
1697 #ifdef EXPERIMENTAL_DSN_INFO
1698 sx->smtp_greeting = string_copy(sx->buffer);
1700 if (!good_response) goto RESPONSE_FAILED;
1702 #ifndef DISABLE_EVENT
1705 lookup_dnssec_authenticated = sx->host->dnssec==DS_YES ? US"yes"
1706 : sx->host->dnssec==DS_NO ? US"no" : NULL;
1707 s = event_raise(sx->tblock->event_action, US"smtp:connect", sx->buffer);
1710 set_errno_nohost(sx->addrlist, ERRNO_EXPANDFAIL,
1711 string_sprintf("deferred by smtp:connect event expansion: %s", s),
1719 /* Now check if the helo_data expansion went well, and sign off cleanly if
1724 message = string_sprintf("failed to expand helo_data: %s",
1725 expand_string_message);
1726 set_errno_nohost(sx->addrlist, ERRNO_EXPANDFAIL, message, DEFER, FALSE);
1732 /** Debugging without sending a message
1733 sx->addrlist->transport_return = DEFER;
1737 /* Errors that occur after this point follow an SMTP command, which is
1738 left in big_buffer by smtp_write_command() for use in error messages. */
1740 smtp_command = big_buffer;
1742 /* Tell the remote who we are...
1744 February 1998: A convention has evolved that ESMTP-speaking MTAs include the
1745 string "ESMTP" in their greeting lines, so make Exim send EHLO if the
1746 greeting is of this form. The assumption was that the far end supports it
1747 properly... but experience shows that there are some that give 5xx responses,
1748 even though the banner includes "ESMTP" (there's a bloody-minded one that
1749 says "ESMTP not spoken here"). Cope with that case.
1751 September 2000: Time has passed, and it seems reasonable now to always send
1752 EHLO at the start. It is also convenient to make the change while installing
1755 July 2003: Joachim Wieland met a broken server that advertises "PIPELINING"
1756 but times out after sending MAIL FROM, RCPT TO and DATA all together. There
1757 would be no way to send out the mails, so there is now a host list
1758 "hosts_avoid_esmtp" that disables ESMTP for special hosts and solves the
1759 PIPELINING problem as well. Maybe it can also be useful to cure other
1760 problems with broken servers.
1762 Exim originally sent "Helo" at this point and ran for nearly a year that way.
1763 Then somebody tried it with a Microsoft mailer... It seems that all other
1764 mailers use upper case for some reason (the RFC is quite clear about case
1765 independence) so, for peace of mind, I gave in. */
1767 sx->esmtp = verify_check_given_host(&sx->ob->hosts_avoid_esmtp, sx->host) != OK;
1769 /* Alas; be careful, since this goto is not an error-out, so conceivably
1770 we might set data between here and the target which we assume to exist
1771 and be usable. I can see this coming back to bite us. */
1775 smtp_peer_options |= OPTION_TLS;
1776 suppress_tls = FALSE;
1777 sx->ob->tls_tempfail_tryclear = FALSE;
1778 smtp_command = US"SSL-on-connect";
1785 if (smtp_write_command(&sx->outblock, SCMD_FLUSH, "%s %s\r\n",
1786 sx->lmtp ? "LHLO" : "EHLO", sx->helo_data) < 0)
1788 sx->esmtp_sent = TRUE;
1789 if (!smtp_read_response(&sx->inblock, sx->buffer, sizeof(sx->buffer), '2',
1790 sx->ob->command_timeout))
1792 if (errno != 0 || sx->buffer[0] == 0 || sx->lmtp)
1794 #ifdef EXPERIMENTAL_DSN_INFO
1795 sx->helo_response = string_copy(sx->buffer);
1797 goto RESPONSE_FAILED;
1801 #ifdef EXPERIMENTAL_DSN_INFO
1802 sx->helo_response = string_copy(sx->buffer);
1807 debug_printf("not sending EHLO (host matches hosts_avoid_esmtp)\n");
1812 int n = sizeof(sx->buffer);
1813 uschar * rsp = sx->buffer;
1815 if (sx->esmtp_sent && (n = Ustrlen(sx->buffer)) < sizeof(sx->buffer)/2)
1816 { rsp = sx->buffer + n + 1; n = sizeof(sx->buffer) - n; }
1818 if (smtp_write_command(&sx->outblock, SCMD_FLUSH, "HELO %s\r\n", sx->helo_data) < 0)
1820 good_response = smtp_read_response(&sx->inblock, rsp, n,
1821 '2', sx->ob->command_timeout);
1822 #ifdef EXPERIMENTAL_DSN_INFO
1823 sx->helo_response = string_copy(rsp);
1827 /* Handle special logging for a closed connection after HELO
1828 when had previously sent EHLO */
1830 if (rsp != sx->buffer && rsp[0] == 0 && (errno == 0 || errno == ECONNRESET))
1832 errno = ERRNO_SMTPCLOSED;
1833 goto EHLOHELO_FAILED;
1835 memmove(sx->buffer, rsp, Ustrlen(rsp));
1836 goto RESPONSE_FAILED;
1840 sx->avoid_option = sx->peer_offered = smtp_peer_options = 0;
1842 if (sx->esmtp || sx->lmtp)
1844 sx->peer_offered = ehlo_response(sx->buffer,
1845 OPTION_TLS /* others checked later */
1848 /* Set tls_offered if the response to EHLO specifies support for STARTTLS. */
1851 smtp_peer_options |= sx->peer_offered & OPTION_TLS;
1856 /* For continuing deliveries down the same channel, having re-exec'd the socket
1857 is the standard input; for a socket held open from verify it is recorded
1858 in the cutthrough context block. Either way we don't need to redo EHLO here
1859 (but may need to do so for TLS - see below).
1860 Set up the pointer to where subsequent commands will be left, for
1861 error messages. Note that smtp_peer_options will have been
1862 set from the command line if they were set in the process that passed the
1865 /*XXX continue case needs to propagate DSN_INFO, prob. in deliver.c
1866 as the continue goes via transport_pass_socket() and doublefork and exec.
1867 It does not wait. Unclear how we keep separate host's responses
1868 separate - we could match up by host ip+port as a bodge. */
1872 if (cutthrough.fd >= 0 && cutthrough.callout_hold_only)
1874 sx->inblock.sock = sx->outblock.sock = cutthrough.fd;
1875 sx->host->port = sx->port = cutthrough.host.port;
1879 sx->inblock.sock = sx->outblock.sock = 0; /* stdin */
1880 smtp_port_for_connect(sx->host, sx->port); /* Record the port that was used */
1882 smtp_command = big_buffer;
1883 sx->helo_data = NULL; /* ensure we re-expand ob->helo_data */
1885 /* For a continued connection with TLS being proxied for us, or a
1886 held-open verify connection with TLS, nothing more to do. */
1888 if ( continue_proxy_cipher
1889 || (cutthrough.fd >= 0 && cutthrough.callout_hold_only && cutthrough.is_tls)
1892 sx->peer_offered = smtp_peer_options;
1893 pipelining_active = !!(smtp_peer_options & OPTION_PIPE);
1894 HDEBUG(D_transport) debug_printf("continued connection, %s TLS\n",
1895 continue_proxy_cipher ? "proxied" : "verify conn with");
1898 HDEBUG(D_transport) debug_printf("continued connection, no TLS\n");
1901 /* If TLS is available on this connection, whether continued or not, attempt to
1902 start up a TLS session, unless the host is in hosts_avoid_tls. If successful,
1903 send another EHLO - the server may give a different answer in secure mode. We
1904 use a separate buffer for reading the response to STARTTLS so that if it is
1905 negative, the original EHLO data is available for subsequent analysis, should
1906 the client not be required to use TLS. If the response is bad, copy the buffer
1907 for error analysis. */
1910 if ( smtp_peer_options & OPTION_TLS
1912 && verify_check_given_host(&sx->ob->hosts_avoid_tls, sx->host) != OK
1914 || verify_check_given_host(&sx->ob->hosts_verify_avoid_tls, sx->host) != OK
1917 uschar buffer2[4096];
1918 if (smtp_write_command(&sx->outblock, SCMD_FLUSH, "STARTTLS\r\n") < 0)
1921 /* If there is an I/O error, transmission of this message is deferred. If
1922 there is a temporary rejection of STARRTLS and tls_tempfail_tryclear is
1923 false, we also defer. However, if there is a temporary rejection of STARTTLS
1924 and tls_tempfail_tryclear is true, or if there is an outright rejection of
1925 STARTTLS, we carry on. This means we will try to send the message in clear,
1926 unless the host is in hosts_require_tls (tested below). */
1928 if (!smtp_read_response(&sx->inblock, buffer2, sizeof(buffer2), '2',
1929 sx->ob->command_timeout))
1933 || (buffer2[0] == '4' && !sx->ob->tls_tempfail_tryclear)
1936 Ustrncpy(sx->buffer, buffer2, sizeof(sx->buffer));
1937 sx->buffer[sizeof(sx->buffer)-1] = '\0';
1938 goto RESPONSE_FAILED;
1942 /* STARTTLS accepted: try to negotiate a TLS session. */
1947 address_item * addr;
1949 int rc = tls_client_start(sx->inblock.sock, sx->host, sx->addrlist, sx->tblock,
1950 # ifdef SUPPORT_DANE
1951 sx->dane ? &tlsa_dnsa : NULL,
1955 /* TLS negotiation failed; give an error. From outside, this function may
1956 be called again to try in clear on a new connection, if the options permit
1957 it for this host. */
1961 # ifdef SUPPORT_DANE
1962 if (sx->dane) log_write(0, LOG_MAIN,
1963 "DANE attempt failed; TLS connection to %s [%s]: %s",
1964 sx->host->name, sx->host->address, errstr);
1967 errno = ERRNO_TLSFAILURE;
1968 message = string_sprintf("TLS session: %s", errstr);
1969 sx->send_quit = FALSE;
1973 /* TLS session is set up */
1975 smtp_peer_options_wrap = smtp_peer_options;
1976 for (addr = sx->addrlist; addr; addr = addr->next)
1977 if (addr->transport_return == PENDING_DEFER)
1979 addr->cipher = tls_out.cipher;
1980 addr->ourcert = tls_out.ourcert;
1981 addr->peercert = tls_out.peercert;
1982 addr->peerdn = tls_out.peerdn;
1983 addr->ocsp = tls_out.ocsp;
1988 /* if smtps, we'll have smtp_command set to something else; always safe to
1990 smtp_command = big_buffer;
1992 /* If we started TLS, redo the EHLO/LHLO exchange over the secure channel. If
1993 helo_data is null, we are dealing with a connection that was passed from
1994 another process, and so we won't have expanded helo_data above. We have to
1995 expand it here. $sending_ip_address and $sending_port are set up right at the
1996 start of the Exim process (in exim.c). */
1998 if (tls_out.active >= 0)
2003 if (!sx->helo_data && !(sx->helo_data = expand_string(sx->ob->helo_data)))
2005 uschar *message = string_sprintf("failed to expand helo_data: %s",
2006 expand_string_message);
2007 set_errno_nohost(sx->addrlist, ERRNO_EXPANDFAIL, message, DEFER, FALSE);
2012 /* For SMTPS we need to wait for the initial OK response. */
2015 good_response = smtp_read_response(&sx->inblock, sx->buffer, sizeof(sx->buffer),
2016 '2', sx->ob->command_timeout);
2017 #ifdef EXPERIMENTAL_DSN_INFO
2018 sx->smtp_greeting = string_copy(sx->buffer);
2020 if (!good_response) goto RESPONSE_FAILED;
2024 greeting_cmd = "EHLO";
2027 greeting_cmd = "HELO";
2029 debug_printf("not sending EHLO (host matches hosts_avoid_esmtp)\n");
2032 if (smtp_write_command(&sx->outblock, SCMD_FLUSH, "%s %s\r\n",
2033 sx->lmtp ? "LHLO" : greeting_cmd, sx->helo_data) < 0)
2035 good_response = smtp_read_response(&sx->inblock, sx->buffer, sizeof(sx->buffer),
2036 '2', sx->ob->command_timeout);
2037 #ifdef EXPERIMENTAL_DSN_INFO
2038 sx->helo_response = string_copy(sx->buffer);
2040 if (!good_response) goto RESPONSE_FAILED;
2041 smtp_peer_options = 0;
2044 /* If the host is required to use a secure channel, ensure that we
2048 # ifdef SUPPORT_DANE
2051 || verify_check_given_host(&sx->ob->hosts_require_tls, sx->host) == OK
2054 errno = ERRNO_TLSREQUIRED;
2055 message = string_sprintf("a TLS session is required, but %s",
2056 smtp_peer_options & OPTION_TLS
2057 ? "an attempt to start TLS failed" : "the server did not offer TLS support");
2060 #endif /*SUPPORT_TLS*/
2062 /* If TLS is active, we have just started it up and re-done the EHLO command,
2063 so its response needs to be analyzed. If TLS is not active and this is a
2064 continued session down a previously-used socket, we haven't just done EHLO, so
2067 if (continue_hostname == NULL
2069 || tls_out.active >= 0
2073 if (sx->esmtp || sx->lmtp)
2075 sx->peer_offered = ehlo_response(sx->buffer,
2077 | (sx->lmtp && sx->ob->lmtp_ignore_quota ? OPTION_IGNQ : 0)
2081 | (sx->addrlist->prop.utf8_msg ? OPTION_UTF8 : 0)
2082 /*XXX if we hand peercaps on to continued-conn processes,
2083 must not depend on this addr */
2087 | (sx->ob->size_addition >= 0 ? OPTION_SIZE : 0)
2090 /* Set for IGNOREQUOTA if the response to LHLO specifies support and the
2091 lmtp_ignore_quota option was set. */
2093 sx->igquotstr = sx->peer_offered & OPTION_IGNQ ? US" IGNOREQUOTA" : US"";
2095 /* If the response to EHLO specified support for the SIZE parameter, note
2096 this, provided size_addition is non-negative. */
2098 smtp_peer_options |= sx->peer_offered & OPTION_SIZE;
2100 /* Note whether the server supports PIPELINING. If hosts_avoid_esmtp matched
2101 the current host, esmtp will be false, so PIPELINING can never be used. If
2102 the current host matches hosts_avoid_pipelining, don't do it. */
2104 if ( sx->peer_offered & OPTION_PIPE
2105 && verify_check_given_host(&sx->ob->hosts_avoid_pipelining, sx->host) != OK)
2106 smtp_peer_options |= OPTION_PIPE;
2108 DEBUG(D_transport) debug_printf("%susing PIPELINING\n",
2109 smtp_peer_options & OPTION_PIPE ? "" : "not ");
2111 if ( sx->peer_offered & OPTION_CHUNKING
2112 && verify_check_given_host(&sx->ob->hosts_try_chunking, sx->host) != OK)
2113 sx->peer_offered &= ~OPTION_CHUNKING;
2115 if (sx->peer_offered & OPTION_CHUNKING)
2116 {DEBUG(D_transport) debug_printf("CHUNKING usable\n");}
2118 #ifndef DISABLE_PRDR
2119 if ( sx->peer_offered & OPTION_PRDR
2120 && verify_check_given_host(&sx->ob->hosts_try_prdr, sx->host) != OK)
2121 sx->peer_offered &= ~OPTION_PRDR;
2123 if (sx->peer_offered & OPTION_PRDR)
2124 {DEBUG(D_transport) debug_printf("PRDR usable\n");}
2127 /* Note if the server supports DSN */
2128 smtp_peer_options |= sx->peer_offered & OPTION_DSN;
2129 DEBUG(D_transport) debug_printf("%susing DSN\n",
2130 sx->peer_offered & OPTION_DSN ? "" : "not ");
2132 /* Note if the response to EHLO specifies support for the AUTH extension.
2133 If it has, check that this host is one we want to authenticate to, and do
2134 the business. The host name and address must be available when the
2135 authenticator's client driver is running. */
2137 switch (yield = smtp_auth(sx->buffer, sizeof(sx->buffer), sx->addrlist, sx->host,
2138 sx->ob, sx->esmtp, &sx->inblock, &sx->outblock))
2140 default: goto SEND_QUIT;
2142 case FAIL_SEND: goto SEND_FAILED;
2143 case FAIL: goto RESPONSE_FAILED;
2147 pipelining_active = !!(smtp_peer_options & OPTION_PIPE);
2149 /* The setting up of the SMTP call is now complete. Any subsequent errors are
2150 message-specific. */
2152 sx->setting_up = FALSE;
2155 if (sx->addrlist->prop.utf8_msg)
2157 sx->utf8_needed = !sx->addrlist->prop.utf8_downcvt
2158 && !sx->addrlist->prop.utf8_downcvt_maybe;
2159 DEBUG(D_transport) if (!sx->utf8_needed)
2160 debug_printf("utf8: %s downconvert\n",
2161 sx->addrlist->prop.utf8_downcvt ? "mandatory" : "optional");
2164 /* If this is an international message we need the host to speak SMTPUTF8 */
2165 if (sx->utf8_needed && !(sx->peer_offered & OPTION_UTF8))
2167 errno = ERRNO_UTF8_FWD;
2168 goto RESPONSE_FAILED;
2180 sx->send_quit = check_response(sx->host, &errno, sx->addrlist->more_errno,
2181 sx->buffer, &code, &message, &pass_message);
2186 message = US string_sprintf("send() to %s [%s] failed: %s",
2187 sx->host->name, sx->host->address, strerror(errno));
2188 sx->send_quit = FALSE;
2193 message = string_sprintf("Remote host closed connection in response to %s"
2194 " (EHLO response was: %s)", smtp_command, sx->buffer);
2195 sx->send_quit = FALSE;
2198 /* This label is jumped to directly when a TLS negotiation has failed,
2199 or was not done for a host for which it is required. Values will be set
2200 in message and errno, and setting_up will always be true. Treat as
2201 a temporary error. */
2209 /* The failure happened while setting up the call; see if the failure was
2210 a 5xx response (this will either be on connection, or following HELO - a 5xx
2211 after EHLO causes it to try HELO). If so, and there are no more hosts to try,
2212 fail all addresses, as this host is never going to accept them. For other
2213 errors during setting up (timeouts or whatever), defer all addresses, and
2214 yield DEFER, so that the host is not tried again for a while.
2216 XXX This peeking for another host feels like a layering violation. We want
2217 to note the host as unusable, but down here we shouldn't know if this was
2218 the last host to try for the addr(list). Perhaps the upper layer should be
2219 the one to do set_errno() ? The problem is that currently the addr is where
2220 errno etc. are stashed, but until we run out of hosts to try the errors are
2221 host-specific. Maybe we should enhance the host_item definition? */
2224 sx->ok = FALSE; /* For when reached by GOTO */
2225 set_errno(sx->addrlist, errno, message,
2230 || errno == ERRNO_UTF8_FWD
2233 pass_message, sx->host
2234 #ifdef EXPERIMENTAL_DSN_INFO
2235 , sx->smtp_greeting, sx->helo_response
2245 (void)smtp_write_command(&sx->outblock, SCMD_FLUSH, "QUIT\r\n");
2248 tls_close(FALSE, TLS_SHUTDOWN_NOWAIT);
2251 /* Close the socket, and return the appropriate value, first setting
2252 works because the NULL setting is passed back to the calling process, and
2253 remote_max_parallel is forced to 1 when delivering over an existing connection,
2256 HDEBUG(D_transport|D_acl|D_v) debug_printf_indent(" SMTP(close)>>\n");
2259 shutdown(sx->outblock.sock, SHUT_WR);
2260 if (fcntl(sx->inblock.sock, F_SETFL, O_NONBLOCK) == 0)
2261 for (rc = 16; read(sx->inblock.sock, sx->inbuffer, sizeof(sx->inbuffer)) > 0 && rc > 0;)
2262 rc--; /* drain socket */
2263 sx->send_quit = FALSE;
2265 (void)close(sx->inblock.sock);
2266 sx->inblock.sock = sx->outblock.sock = -1;
2268 #ifndef DISABLE_EVENT
2269 (void) event_raise(sx->tblock->event_action, US"tcp:close", NULL);
2272 continue_transport = NULL;
2273 continue_hostname = NULL;
2280 /* Create the string of options that will be appended to the MAIL FROM:
2281 in the connection context buffer */
2284 build_mailcmd_options(smtp_context * sx, address_item * addrlist)
2286 uschar * p = sx->buffer;
2287 address_item * addr;
2292 /* If we know the receiving MTA supports the SIZE qualification, and we know it,
2293 send it, adding something to the message size to allow for imprecision
2294 and things that get added en route. Exim keeps the number of lines
2295 in a message, so we can give an accurate value for the original message, but we
2296 need some additional to handle added headers. (Double "." characters don't get
2297 included in the count.) */
2299 if ( message_size > 0
2300 && sx->peer_offered & OPTION_SIZE && !(sx->avoid_option & OPTION_SIZE))
2302 /*XXX problem here under spool_files_wireformat?
2303 Or just forget about lines? Or inflate by a fixed proportion? */
2305 sprintf(CS p, " SIZE=%d", message_size+message_linecount+sx->ob->size_addition);
2309 #ifndef DISABLE_PRDR
2310 /* If it supports Per-Recipient Data Reponses, and we have omre than one recipient,
2313 sx->prdr_active = FALSE;
2314 if (sx->peer_offered & OPTION_PRDR)
2315 for (addr = addrlist; addr; addr = addr->next)
2316 if (addr->transport_return == PENDING_DEFER)
2318 for (addr = addr->next; addr; addr = addr->next)
2319 if (addr->transport_return == PENDING_DEFER)
2320 { /* at least two recipients to send */
2321 sx->prdr_active = TRUE;
2322 sprintf(CS p, " PRDR"); p += 5;
2330 /* If it supports internationalised messages, and this meesage need that,
2333 if ( sx->peer_offered & OPTION_UTF8
2334 && addrlist->prop.utf8_msg
2335 && !addrlist->prop.utf8_downcvt
2337 Ustrcpy(p, " SMTPUTF8"), p += 9;
2340 /* check if all addresses have DSN-lasthop flag; do not send RET and ENVID if so */
2341 for (sx->dsn_all_lasthop = TRUE, addr = addrlist, address_count = 0;
2342 addr && address_count < sx->max_rcpt;
2343 addr = addr->next) if (addr->transport_return == PENDING_DEFER)
2346 if (!(addr->dsn_flags & rf_dsnlasthop))
2348 sx->dsn_all_lasthop = FALSE;
2353 /* Add any DSN flags to the mail command */
2355 if (sx->peer_offered & OPTION_DSN && !sx->dsn_all_lasthop)
2357 if (dsn_ret == dsn_ret_hdrs)
2358 { Ustrcpy(p, " RET=HDRS"); p += 9; }
2359 else if (dsn_ret == dsn_ret_full)
2360 { Ustrcpy(p, " RET=FULL"); p += 9; }
2364 string_format(p, sizeof(sx->buffer) - (p-sx->buffer), " ENVID=%s", dsn_envid);
2369 /* If an authenticated_sender override has been specified for this transport
2370 instance, expand it. If the expansion is forced to fail, and there was already
2371 an authenticated_sender for this message, the original value will be used.
2372 Other expansion failures are serious. An empty result is ignored, but there is
2373 otherwise no check - this feature is expected to be used with LMTP and other
2374 cases where non-standard addresses (e.g. without domains) might be required. */
2376 if (smtp_mail_auth_str(p, sizeof(sx->buffer) - (p-sx->buffer), addrlist, sx->ob))
2384 build_rcptcmd_options(smtp_context * sx, const address_item * addr)
2386 uschar * p = sx->buffer;
2389 /* Add any DSN flags to the rcpt command */
2391 if (sx->peer_offered & OPTION_DSN && !(addr->dsn_flags & rf_dsnlasthop))
2393 if (addr->dsn_flags & rf_dsnflags)
2398 Ustrcpy(p, " NOTIFY=");
2400 for (i = 0; i < nelem(rf_list); i++) if (addr->dsn_flags & rf_list[i])
2402 if (!first) *p++ = ',';
2404 Ustrcpy(p, rf_names[i]);
2409 if (addr->dsn_orcpt)
2411 string_format(p, sizeof(sx->buffer) - (p-sx->buffer), " ORCPT=%s",
2422 0 good, rcpt results in addr->transport_return (PENDING_OK, DEFER, FAIL)
2423 -1 MAIL response error
2424 -2 any non-MAIL read i/o error
2425 -3 non-MAIL response timeout
2426 -4 internal error; channel still usable
2431 smtp_write_mail_and_rcpt_cmds(smtp_context * sx, int * yield)
2433 address_item * addr;
2437 if (build_mailcmd_options(sx, sx->first_addr) != OK)
2443 /* From here until we send the DATA command, we can make use of PIPELINING
2444 if the server host supports it. The code has to be able to check the responses
2445 at any point, for when the buffer fills up, so we write it totally generally.
2446 When PIPELINING is off, each command written reports that it has flushed the
2449 sx->pending_MAIL = TRUE; /* The block starts with MAIL */
2452 uschar * s = sx->from_addr;
2454 uschar * errstr = NULL;
2456 /* If we must downconvert, do the from-address here. Remember we had to
2457 for the to-addresses (done below), and also (ugly) for re-doing when building
2458 the delivery log line. */
2460 if ( sx->addrlist->prop.utf8_msg
2461 && (sx->addrlist->prop.utf8_downcvt || !(sx->peer_offered & OPTION_UTF8))
2464 if (s = string_address_utf8_to_alabel(s, &errstr), errstr)
2466 set_errno_nohost(sx->addrlist, ERRNO_EXPANDFAIL, errstr, DEFER, FALSE);
2470 setflag(sx->addrlist, af_utf8_downcvt);
2474 rc = smtp_write_command(&sx->outblock, pipelining_active ? SCMD_BUFFER : SCMD_FLUSH,
2475 "MAIL FROM:<%s>%s\r\n", s, sx->buffer);
2478 mail_command = string_copy(big_buffer); /* Save for later error message */
2482 case -1: /* Transmission error */
2485 case +1: /* Cmd was sent */
2486 if (!smtp_read_response(&sx->inblock, sx->buffer, sizeof(sx->buffer), '2',
2487 sx->ob->command_timeout))
2489 if (errno == 0 && sx->buffer[0] == '4')
2491 errno = ERRNO_MAIL4XX;
2492 sx->addrlist->more_errno |= ((sx->buffer[1] - '0')*10 + sx->buffer[2] - '0') << 8;
2496 sx->pending_MAIL = FALSE;
2499 /* otherwise zero: command queued for pipeline */
2502 /* Pass over all the relevant recipient addresses for this host, which are the
2503 ones that have status PENDING_DEFER. If we are using PIPELINING, we can send
2504 several before we have to read the responses for those seen so far. This
2505 checking is done by a subroutine because it also needs to be done at the end.
2506 Send only up to max_rcpt addresses at a time, leaving next_addr pointing to
2507 the next one if not all are sent.
2509 In the MUA wrapper situation, we want to flush the PIPELINING buffer for the
2510 last address because we want to abort if any recipients have any kind of
2511 problem, temporary or permanent. We know that all recipient addresses will have
2512 the PENDING_DEFER status, because only one attempt is ever made, and we know
2513 that max_rcpt will be large, so all addresses will be done at once.
2515 For verify we flush the pipeline after any (the only) rcpt address. */
2517 for (addr = sx->first_addr, address_count = 0;
2518 addr && address_count < sx->max_rcpt;
2519 addr = addr->next) if (addr->transport_return == PENDING_DEFER)
2525 if (tcp_out_fastopen && !tcp_out_fastopen_logged)
2527 setflag(addr, af_tcp_fastopen_conn);
2528 if (tcp_out_fastopen > 1) setflag(addr, af_tcp_fastopen);
2531 addr->dsn_aware = sx->peer_offered & OPTION_DSN
2532 ? dsn_support_yes : dsn_support_no;
2535 no_flush = pipelining_active && !sx->verify
2536 && (!mua_wrapper || addr->next && address_count < sx->max_rcpt);
2538 build_rcptcmd_options(sx, addr);
2540 /* Now send the RCPT command, and process outstanding responses when
2541 necessary. After a timeout on RCPT, we just end the function, leaving the
2542 yield as OK, because this error can often mean that there is a problem with
2543 just one address, so we don't want to delay the host. */
2545 rcpt_addr = transport_rcpt_address(addr, sx->tblock->rcpt_include_affixes);
2548 if ( testflag(sx->addrlist, af_utf8_downcvt)
2549 && !(rcpt_addr = string_address_utf8_to_alabel(rcpt_addr, NULL))
2552 /*XXX could we use a per-address errstr here? Not fail the whole send? */
2553 errno = ERRNO_EXPANDFAIL;
2554 return -5; /*XXX too harsh? */
2558 count = smtp_write_command(&sx->outblock, no_flush ? SCMD_BUFFER : SCMD_FLUSH,
2559 "RCPT TO:<%s>%s%s\r\n", rcpt_addr, sx->igquotstr, sx->buffer);
2561 if (count < 0) return -5;
2564 switch(sync_responses(sx, count, 0))
2566 case 3: sx->ok = TRUE; /* 2xx & 5xx => OK & progress made */
2567 case 2: sx->completed_addr = TRUE; /* 5xx (only) => progress made */
2570 case 1: sx->ok = TRUE; /* 2xx (only) => OK, but if LMTP, */
2571 if (!sx->lmtp) /* can't tell about progress yet */
2572 sx->completed_addr = TRUE;
2573 case 0: /* No 2xx or 5xx, but no probs */
2576 case -1: return -3; /* Timeout on RCPT */
2577 case -2: return -2; /* non-MAIL read i/o error */
2578 default: return -1; /* any MAIL error */
2580 sx->pending_MAIL = FALSE; /* Dealt with MAIL */
2582 } /* Loop for next address */
2584 tcp_out_fastopen_logged = TRUE;
2585 sx->next_addr = addr;
2591 /*****************************************************
2592 * Proxy TLS connection for another transport process *
2593 ******************************************************/
2595 Close the unused end of the pipe, fork once more, then use the given buffer
2596 as a staging area, and select on both the given fd and the TLS'd client-fd for
2597 data to read (per the coding in ip_recv() and fd_ready() this is legitimate).
2598 Do blocking full-size writes, and reads under a timeout. Once both input
2599 channels are closed, exit the process.
2602 buf space to use for buffering
2603 bufsiz size of buffer
2604 pfd pipe filedescriptor array; [0] is comms to proxied process
2605 timeout per-read timeout, seconds
2609 smtp_proxy_tls(uschar * buf, size_t bsize, int * pfd, int timeout)
2612 int max_fd = MAX(pfd[0], tls_out.active) + 1;
2613 int rc, i, fd_bits, nbytes;
2618 DEBUG(D_transport) debug_printf("proxy-proc final-pid %d\n", rc);
2619 _exit(rc < 0 ? EXIT_FAILURE : EXIT_SUCCESS);
2622 if (running_in_test_harness) millisleep(100); /* let parent debug out */
2623 set_process_info("proxying TLS connection for continued transport");
2625 FD_SET(tls_out.active, &rfds);
2626 FD_SET(pfd[0], &rfds);
2628 for (fd_bits = 3; fd_bits; )
2630 time_t time_left = timeout;
2631 time_t time_start = time(NULL);
2637 struct timeval tv = { time_left, 0 };
2640 (SELECT_ARG2_TYPE *)&rfds, NULL, (SELECT_ARG2_TYPE *)&efds, &tv);
2642 if (rc < 0 && errno == EINTR)
2643 if ((time_left -= time(NULL) - time_start) > 0) continue;
2647 DEBUG(D_transport) if (rc == 0) debug_printf("%s: timed out\n", __FUNCTION__);
2651 if (FD_ISSET(tls_out.active, &efds) || FD_ISSET(pfd[0], &efds))
2653 DEBUG(D_transport) debug_printf("select: exceptional cond on %s fd\n",
2654 FD_ISSET(pfd[0], &efds) ? "proxy" : "tls");
2658 while (rc < 0 || !(FD_ISSET(tls_out.active, &rfds) || FD_ISSET(pfd[0], &rfds)));
2660 /* handle inbound data */
2661 if (FD_ISSET(tls_out.active, &rfds))
2662 if ((rc = tls_read(FALSE, buf, bsize)) <= 0)
2665 FD_CLR(tls_out.active, &rfds);
2666 shutdown(pfd[0], SHUT_WR);
2671 for (nbytes = 0; rc - nbytes > 0; nbytes += i)
2672 if ((i = write(pfd[0], buf + nbytes, rc - nbytes)) < 0) goto done;
2674 else if (fd_bits & 1)
2675 FD_SET(tls_out.active, &rfds);
2677 /* handle outbound data */
2678 if (FD_ISSET(pfd[0], &rfds))
2679 if ((rc = read(pfd[0], buf, bsize)) <= 0)
2682 tls_close(FALSE, TLS_SHUTDOWN_NOWAIT);
2686 for (nbytes = 0; rc - nbytes > 0; nbytes += i)
2687 if ((i = tls_write(FALSE, buf + nbytes, rc - nbytes, FALSE)) < 0)
2690 else if (fd_bits & 2)
2691 FD_SET(pfd[0], &rfds);
2695 if (running_in_test_harness) millisleep(100); /* let logging complete */
2696 exim_exit(0, US"TLS proxy");
2701 /*************************************************
2702 * Deliver address list to given host *
2703 *************************************************/
2705 /* If continue_hostname is not null, we get here only when continuing to
2706 deliver down an existing channel. The channel was passed as the standard
2707 input. TLS is never active on a passed channel; the previous process always
2708 closes it down before passing the connection on.
2710 Otherwise, we have to make a connection to the remote host, and do the
2711 initial protocol exchange.
2713 When running as an MUA wrapper, if the sender or any recipient is rejected,
2714 temporarily or permanently, we force failure for all recipients.
2717 addrlist chain of potential addresses to deliver; only those whose
2718 transport_return field is set to PENDING_DEFER are currently
2719 being processed; others should be skipped - they have either
2720 been delivered to an earlier host or IP address, or been
2721 failed by one of them.
2722 host host to deliver to
2723 host_af AF_INET or AF_INET6
2724 defport default TCP/IP port to use if host does not specify, in host
2726 interface interface to bind to, or NULL
2727 tblock transport instance block
2728 message_defer set TRUE if yield is OK, but all addresses were deferred
2729 because of a non-recipient, non-host failure, that is, a
2730 4xx response to MAIL FROM, DATA, or ".". This is a defer
2731 that is specific to the message.
2732 suppress_tls if TRUE, don't attempt a TLS connection - this is set for
2733 a second attempt after TLS initialization fails
2735 Returns: OK - the connection was made and the delivery attempted;
2736 the result for each address is in its data block.
2737 DEFER - the connection could not be made, or something failed
2738 while setting up the SMTP session, or there was a
2739 non-message-specific error, such as a timeout.
2740 ERROR - a filter command is specified for this transport,
2741 and there was a problem setting it up; OR helo_data
2742 or add_headers or authenticated_sender is specified
2743 for this transport, and the string failed to expand
2747 smtp_deliver(address_item *addrlist, host_item *host, int host_af, int defport,
2748 uschar *interface, transport_instance *tblock,
2749 BOOL *message_defer, BOOL suppress_tls)
2755 struct timeval start_delivery_time;
2757 BOOL pass_message = FALSE;
2758 uschar *message = NULL;
2759 uschar new_message_id[MESSAGE_ID_LENGTH + 1];
2763 gettimeofday(&start_delivery_time, NULL);
2764 suppress_tls = suppress_tls; /* stop compiler warning when no TLS support */
2765 *message_defer = FALSE;
2767 sx.addrlist = addrlist;
2769 sx.host_af = host_af,
2771 sx.interface = interface;
2772 sx.helo_data = NULL;
2776 /* Get the channel set up ready for a message (MAIL FROM being the next
2777 SMTP command to send */
2779 if ((rc = smtp_setup_conn(&sx, suppress_tls)) != OK)
2782 /* If there is a filter command specified for this transport, we can now
2783 set it up. This cannot be done until the identify of the host is known. */
2785 if (tblock->filter_command)
2787 transport_filter_timeout = tblock->filter_timeout;
2789 /* On failure, copy the error to all addresses, abandon the SMTP call, and
2792 if (!transport_set_up_command(&transport_filter_argv,
2793 tblock->filter_command, TRUE, DEFER, addrlist,
2794 string_sprintf("%.50s transport", tblock->name), NULL))
2796 set_errno_nohost(addrlist->next, addrlist->basic_errno, addrlist->message, DEFER,
2802 if ( transport_filter_argv
2803 && *transport_filter_argv
2804 && **transport_filter_argv
2805 && sx.peer_offered & OPTION_CHUNKING
2808 sx.peer_offered &= ~OPTION_CHUNKING;
2809 DEBUG(D_transport) debug_printf("CHUNKING not usable due to transport filter\n");
2813 sx.first_addr = addrlist;
2815 /* For messages that have more than the maximum number of envelope recipients,
2816 we want to send several transactions down the same SMTP connection. (See
2817 comments in deliver.c as to how this reconciles, heuristically, with
2818 remote_max_parallel.) This optimization was added to Exim after the following
2819 code was already working. The simplest way to put it in without disturbing the
2820 code was to use a goto to jump back to this point when there is another
2821 transaction to handle. */
2824 sx.from_addr = return_path;
2825 sx.sync_addr = sx.first_addr;
2827 sx.send_rset = TRUE;
2828 sx.completed_addr = FALSE;
2831 /* If we are a continued-connection-after-verify the MAIL and RCPT
2832 commands were already sent; do not re-send but do mark the addrs as
2833 having been accepted up to RCPT stage. A traditional cont-conn
2834 always has a sequence number greater than one. */
2836 if (continue_hostname && continue_sequence == 1)
2838 address_item * addr;
2840 sx.peer_offered = smtp_peer_options;
2841 sx.pending_MAIL = FALSE;
2843 sx.next_addr = NULL;
2845 for (addr = addrlist; addr; addr = addr->next)
2846 addr->transport_return = PENDING_OK;
2850 /* Initiate a message transfer. */
2852 switch(smtp_write_mail_and_rcpt_cmds(&sx, &yield))
2855 case -1: case -2: goto RESPONSE_FAILED;
2856 case -3: goto END_OFF;
2857 case -4: goto SEND_QUIT;
2858 default: goto SEND_FAILED;
2861 /* If we are an MUA wrapper, abort if any RCPTs were rejected, either
2862 permanently or temporarily. We should have flushed and synced after the last
2870 for (a = sx.first_addr, cnt = 0; a && cnt < sx.max_rcpt; a = a->next, cnt++)
2871 if (a->transport_return != PENDING_OK)
2873 /*XXX could we find a better errno than 0 here? */
2874 set_errno_nohost(addrlist, 0, a->message, FAIL,
2875 testflag(a, af_pass_message));
2882 /* If ok is TRUE, we know we have got at least one good recipient, and must now
2883 send DATA, but if it is FALSE (in the normal, non-wrapper case), we may still
2884 have a good recipient buffered up if we are pipelining. We don't want to waste
2885 time sending DATA needlessly, so we only send it if either ok is TRUE or if we
2886 are pipelining. The responses are all handled by sync_responses().
2887 If using CHUNKING, do not send a BDAT until we know how big a chunk we want
2890 if ( !(sx.peer_offered & OPTION_CHUNKING)
2891 && (sx.ok || (pipelining_active && !mua_wrapper)))
2893 int count = smtp_write_command(&sx.outblock, SCMD_FLUSH, "DATA\r\n");
2895 if (count < 0) goto SEND_FAILED;
2896 switch(sync_responses(&sx, count, sx.ok ? +1 : -1))
2898 case 3: sx.ok = TRUE; /* 2xx & 5xx => OK & progress made */
2899 case 2: sx.completed_addr = TRUE; /* 5xx (only) => progress made */
2902 case 1: sx.ok = TRUE; /* 2xx (only) => OK, but if LMTP, */
2903 if (!sx.lmtp) sx.completed_addr = TRUE; /* can't tell about progress yet */
2904 case 0: break; /* No 2xx or 5xx, but no probs */
2906 case -1: goto END_OFF; /* Timeout on RCPT */
2907 default: goto RESPONSE_FAILED; /* I/O error, or any MAIL/DATA error */
2909 pipelining_active = FALSE;
2910 data_command = string_copy(big_buffer); /* Save for later error message */
2913 /* If there were no good recipients (but otherwise there have been no
2914 problems), just set ok TRUE, since we have handled address-specific errors
2915 already. Otherwise, it's OK to send the message. Use the check/escape mechanism
2916 for handling the SMTP dot-handling protocol, flagging to apply to headers as
2917 well as body. Set the appropriate timeout value to be used for each chunk.
2918 (Haven't been able to make it work using select() for writing yet.) */
2920 if (!(sx.peer_offered & OPTION_CHUNKING) && !sx.ok)
2922 /* Save the first address of the next batch. */
2923 sx.first_addr = sx.next_addr;
2929 transport_ctx tctx = {
2933 US".", US"..", /* Escaping strings */
2934 topt_use_crlf | topt_escape_headers
2935 | (tblock->body_only ? topt_no_headers : 0)
2936 | (tblock->headers_only ? topt_no_body : 0)
2937 | (tblock->return_path_add ? topt_add_return_path : 0)
2938 | (tblock->delivery_date_add ? topt_add_delivery_date : 0)
2939 | (tblock->envelope_to_add ? topt_add_envelope_to : 0)
2942 /* If using CHUNKING we need a callback from the generic transport
2943 support to us, for the sending of BDAT smtp commands and the reaping
2944 of responses. The callback needs a whole bunch of state so set up
2945 a transport-context structure to be passed around. */
2947 if (sx.peer_offered & OPTION_CHUNKING)
2949 tctx.check_string = tctx.escape_string = NULL;
2950 tctx.options |= topt_use_bdat;
2951 tctx.chunk_cb = smtp_chunk_cmd_callback;
2952 sx.pending_BDAT = FALSE;
2953 sx.good_RCPT = sx.ok;
2955 tctx.smtp_context = &sx;
2958 tctx.options |= topt_end_dot;
2960 /* Save the first address of the next batch. */
2961 sx.first_addr = sx.next_addr;
2963 /* Responses from CHUNKING commands go in buffer. Otherwise,
2964 there has not been a response. */
2968 sigalrm_seen = FALSE;
2969 transport_write_timeout = sx.ob->data_timeout;
2970 smtp_command = US"sending data block"; /* For error messages */
2971 DEBUG(D_transport|D_v)
2972 if (sx.peer_offered & OPTION_CHUNKING)
2973 debug_printf(" will write message using CHUNKING\n");
2975 debug_printf(" SMTP>> writing message and terminating \".\"\n");
2976 transport_count = 0;
2978 #ifndef DISABLE_DKIM
2979 dkim_exim_sign_init();
2980 # ifdef EXPERIMENTAL_ARC
2982 uschar * s = sx.ob->arc_sign;
2985 if (!(sx.ob->dkim.arc_signspec = expand_string(s)))
2987 message = US"failed to expand arc_sign";
2991 /* Ask dkim code to hash the body for ARC */
2992 (void) arc_ams_setup_sign_bodyhash();
2993 sx.ob->dkim.force_bodyhash = TRUE;
2997 sx.ok = dkim_transport_write_message(&tctx, &sx.ob->dkim, CUSS &message);
2999 sx.ok = transport_write_message(&tctx, 0);
3002 /* transport_write_message() uses write() because it is called from other
3003 places to write to non-sockets. This means that under some OS (e.g. Solaris)
3004 it can exit with "Broken pipe" as its error. This really means that the
3005 socket got closed at the far end. */
3007 transport_write_timeout = 0; /* for subsequent transports */
3009 /* Failure can either be some kind of I/O disaster (including timeout),
3010 or the failure of a transport filter or the expansion of added headers.
3011 Or, when CHUNKING, it can be a protocol-detected failure. */
3014 if (message) goto SEND_FAILED;
3015 else goto RESPONSE_FAILED;
3017 /* We used to send the terminating "." explicitly here, but because of
3018 buffering effects at both ends of TCP/IP connections, you don't gain
3019 anything by keeping it separate, so it might as well go in the final
3020 data buffer for efficiency. This is now done by setting the topt_end_dot
3023 smtp_command = US"end of data";
3025 if (sx.peer_offered & OPTION_CHUNKING && sx.cmd_count > 1)
3027 /* Reap any outstanding MAIL & RCPT commands, but not a DATA-go-ahead */
3028 switch(sync_responses(&sx, sx.cmd_count-1, 0))
3030 case 3: sx.ok = TRUE; /* 2xx & 5xx => OK & progress made */
3031 case 2: sx.completed_addr = TRUE; /* 5xx (only) => progress made */
3034 case 1: sx.ok = TRUE; /* 2xx (only) => OK, but if LMTP, */
3035 if (!sx.lmtp) sx.completed_addr = TRUE; /* can't tell about progress yet */
3036 case 0: break; /* No 2xx or 5xx, but no probs */
3038 case -1: goto END_OFF; /* Timeout on RCPT */
3039 default: goto RESPONSE_FAILED; /* I/O error, or any MAIL/DATA error */
3043 #ifndef DISABLE_PRDR
3044 /* For PRDR we optionally get a partial-responses warning
3045 * followed by the individual responses, before going on with
3046 * the overall response. If we don't get the warning then deal
3047 * with per non-PRDR. */
3050 sx.ok = smtp_read_response(&sx.inblock, sx.buffer, sizeof(sx.buffer), '3',
3051 sx.ob->final_timeout);
3052 if (!sx.ok && errno == 0) switch(sx.buffer[0])
3054 case '2': sx.prdr_active = FALSE;
3057 case '4': errno = ERRNO_DATA4XX;
3058 addrlist->more_errno |=
3059 ((sx.buffer[1] - '0')*10 + sx.buffer[2] - '0') << 8;
3066 /* For non-PRDR SMTP, we now read a single response that applies to the
3067 whole message. If it is OK, then all the addresses have been delivered. */
3071 sx.ok = smtp_read_response(&sx.inblock, sx.buffer, sizeof(sx.buffer), '2',
3072 sx.ob->final_timeout);
3073 if (!sx.ok && errno == 0 && sx.buffer[0] == '4')
3075 errno = ERRNO_DATA4XX;
3076 addrlist->more_errno |= ((sx.buffer[1] - '0')*10 + sx.buffer[2] - '0') << 8;
3080 /* For LMTP, we get back a response for every RCPT command that we sent;
3081 some may be accepted and some rejected. For those that get a response, their
3082 status is fixed; any that are accepted have been handed over, even if later
3083 responses crash - at least, that's how I read RFC 2033.
3085 If all went well, mark the recipient addresses as completed, record which
3086 host/IPaddress they were delivered to, and cut out RSET when sending another
3087 message down the same channel. Write the completed addresses to the journal
3088 now so that they are recorded in case there is a crash of hardware or
3089 software before the spool gets updated. Also record the final SMTP
3090 confirmation if needed (for SMTP only). */
3095 struct timeval delivery_time;
3097 uschar * conf = NULL;
3099 timesince(&delivery_time, &start_delivery_time);
3100 sx.send_rset = FALSE;
3101 pipelining_active = FALSE;
3103 /* Set up confirmation if needed - applies only to SMTP */
3106 #ifdef DISABLE_EVENT
3107 LOGGING(smtp_confirmation) &&
3112 const uschar *s = string_printing(sx.buffer);
3113 /* deconst cast ok here as string_printing was checked to have alloc'n'copied */
3114 conf = (s == sx.buffer)? US string_copy(s) : US s;
3117 /* Process all transported addresses - for LMTP or PRDR, read a status for
3120 for (addr = addrlist; addr != sx.first_addr; addr = addr->next)
3122 if (addr->transport_return != PENDING_OK) continue;
3124 /* LMTP - if the response fails badly (e.g. timeout), use it for all the
3125 remaining addresses. Otherwise, it's a return code for just the one
3126 address. For temporary errors, add a retry item for the address so that
3127 it doesn't get tried again too soon. */
3129 #ifndef DISABLE_PRDR
3130 if (sx.lmtp || sx.prdr_active)
3135 if (!smtp_read_response(&sx.inblock, sx.buffer, sizeof(sx.buffer), '2',
3136 sx.ob->final_timeout))
3138 if (errno != 0 || sx.buffer[0] == 0) goto RESPONSE_FAILED;
3139 addr->message = string_sprintf(
3140 #ifndef DISABLE_PRDR
3141 "%s error after %s: %s", sx.prdr_active ? "PRDR":"LMTP",
3143 "LMTP error after %s: %s",
3145 data_command, string_printing(sx.buffer));
3146 setflag(addr, af_pass_message); /* Allow message to go to user */
3147 if (sx.buffer[0] == '5')
3148 addr->transport_return = FAIL;
3151 errno = ERRNO_DATA4XX;
3152 addr->more_errno |= ((sx.buffer[1] - '0')*10 + sx.buffer[2] - '0') << 8;
3153 addr->transport_return = DEFER;
3154 #ifndef DISABLE_PRDR
3155 if (!sx.prdr_active)
3157 retry_add_item(addr, addr->address_retry_key, 0);
3161 sx.completed_addr = TRUE; /* NOW we can set this flag */
3162 if (LOGGING(smtp_confirmation))
3164 const uschar *s = string_printing(sx.buffer);
3165 /* deconst cast ok here as string_printing was checked to have alloc'n'copied */
3166 conf = (s == sx.buffer) ? US string_copy(s) : US s;
3170 /* SMTP, or success return from LMTP for this address. Pass back the
3171 actual host that was used. */
3173 addr->transport_return = OK;
3174 addr->more_errno = delivery_time.tv_sec;
3175 addr->delivery_usec = delivery_time.tv_usec;
3176 addr->host_used = host;
3177 addr->special_action = flag;
3178 addr->message = conf;
3179 #ifndef DISABLE_PRDR
3180 if (sx.prdr_active) setflag(addr, af_prdr_used);
3182 if (sx.peer_offered & OPTION_CHUNKING) setflag(addr, af_chunking_used);
3185 #ifndef DISABLE_PRDR
3186 if (!sx.prdr_active)
3189 /* Update the journal. For homonymic addresses, use the base address plus
3190 the transport name. See lots of comments in deliver.c about the reasons
3191 for the complications when homonyms are involved. Just carry on after
3192 write error, as it may prove possible to update the spool file later. */
3194 if (testflag(addr, af_homonym))
3195 sprintf(CS sx.buffer, "%.500s/%s\n", addr->unique + 3, tblock->name);
3197 sprintf(CS sx.buffer, "%.500s\n", addr->unique);
3199 DEBUG(D_deliver) debug_printf("S:journalling %s\n", sx.buffer);
3200 len = Ustrlen(CS sx.buffer);
3201 if (write(journal_fd, sx.buffer, len) != len)
3202 log_write(0, LOG_MAIN|LOG_PANIC, "failed to write journal for "
3203 "%s: %s", sx.buffer, strerror(errno));
3207 #ifndef DISABLE_PRDR
3210 /* PRDR - get the final, overall response. For any non-success
3211 upgrade all the address statuses. */
3212 sx.ok = smtp_read_response(&sx.inblock, sx.buffer, sizeof(sx.buffer), '2',
3213 sx.ob->final_timeout);
3216 if(errno == 0 && sx.buffer[0] == '4')
3218 errno = ERRNO_DATA4XX;
3219 addrlist->more_errno |= ((sx.buffer[1] - '0')*10 + sx.buffer[2] - '0') << 8;
3221 for (addr = addrlist; addr != sx.first_addr; addr = addr->next)
3222 if (sx.buffer[0] == '5' || addr->transport_return == OK)
3223 addr->transport_return = PENDING_OK; /* allow set_errno action */
3224 goto RESPONSE_FAILED;
3227 /* Update the journal, or setup retry. */
3228 for (addr = addrlist; addr != sx.first_addr; addr = addr->next)
3229 if (addr->transport_return == OK)
3231 if (testflag(addr, af_homonym))
3232 sprintf(CS sx.buffer, "%.500s/%s\n", addr->unique + 3, tblock->name);
3234 sprintf(CS sx.buffer, "%.500s\n", addr->unique);
3236 DEBUG(D_deliver) debug_printf("journalling(PRDR) %s\n", sx.buffer);
3237 len = Ustrlen(CS sx.buffer);
3238 if (write(journal_fd, sx.buffer, len) != len)
3239 log_write(0, LOG_MAIN|LOG_PANIC, "failed to write journal for "
3240 "%s: %s", sx.buffer, strerror(errno));
3242 else if (addr->transport_return == DEFER)
3243 retry_add_item(addr, addr->address_retry_key, -2);
3247 /* Ensure the journal file is pushed out to disk. */
3249 if (EXIMfsync(journal_fd) < 0)
3250 log_write(0, LOG_MAIN|LOG_PANIC, "failed to fsync journal: %s",
3256 /* Handle general (not specific to one address) failures here. The value of ok
3257 is used to skip over this code on the falling through case. A timeout causes a
3258 deferral. Other errors may defer or fail according to the response code, and
3259 may set up a special errno value, e.g. after connection chopped, which is
3260 assumed if errno == 0 and there is no text in the buffer. If control reaches
3261 here during the setting up phase (i.e. before MAIL FROM) then always defer, as
3262 the problem is not related to this specific message. */
3267 uschar * set_message;
3273 sx.send_quit = check_response(host, &save_errno, addrlist->more_errno,
3274 sx.buffer, &code, &message, &pass_message);
3282 message = string_sprintf("send() to %s [%s] failed: %s",
3283 host->name, host->address, message ? message : US strerror(save_errno));
3284 sx.send_quit = FALSE;
3292 sx.ok = FALSE; /* For when reached by GOTO */
3293 set_message = message;
3295 /* We want to handle timeouts after MAIL or "." and loss of connection after
3296 "." specially. They can indicate a problem with the sender address or with
3297 the contents of the message rather than a real error on the connection. These
3298 cases are treated in the same way as a 4xx response. This next bit of code
3299 does the classification. */
3306 message_error = TRUE;
3310 message_error = Ustrncmp(smtp_command,"MAIL",4) == 0 ||
3311 Ustrncmp(smtp_command,"end ",4) == 0;
3314 case ERRNO_SMTPCLOSED:
3315 message_error = Ustrncmp(smtp_command,"end ",4) == 0;
3319 message_error = FALSE;
3323 /* Handle the cases that are treated as message errors. These are:
3325 (a) negative response or timeout after MAIL
3326 (b) negative response after DATA
3327 (c) negative response or timeout or dropped connection after "."
3328 (d) utf8 support required and not offered
3330 It won't be a negative response or timeout after RCPT, as that is dealt
3331 with separately above. The action in all cases is to set an appropriate
3332 error code for all the addresses, but to leave yield set to OK because the
3333 host itself has not failed. Of course, it might in practice have failed
3334 when we've had a timeout, but if so, we'll discover that at the next
3335 delivery attempt. For a temporary error, set the message_defer flag, and
3336 write to the logs for information if this is not the last host. The error
3337 for the last host will be logged as part of the address's log line. */
3341 if (mua_wrapper) code = '5'; /* Force hard failure in wrapper mode */
3343 /* If there's an errno, the message contains just the identity of
3348 else /* Anything other than 5 is treated as temporary */
3352 message = US string_sprintf("%s: %s", message, strerror(save_errno));
3354 write_logs(host, message, sx.first_addr ? sx.first_addr->basic_errno : 0);
3356 *message_defer = TRUE;
3360 /* Otherwise, we have an I/O error or a timeout other than after MAIL or
3361 ".", or some other transportation error. We defer all addresses and yield
3362 DEFER, except for the case of failed add_headers expansion, or a transport
3363 filter failure, when the yield should be ERROR, to stop it trying other
3369 yield = (save_errno == ERRNO_CHHEADER_FAIL ||
3370 save_errno == ERRNO_FILTER_FAIL)? ERROR : DEFER;
3374 set_errno(addrlist, save_errno, set_message, set_rc, pass_message, host
3375 #ifdef EXPERIMENTAL_DSN_INFO
3376 , sx.smtp_greeting, sx.helo_response
3382 /* If all has gone well, send_quit will be set TRUE, implying we can end the
3383 SMTP session tidily. However, if there were too many addresses to send in one
3384 message (indicated by first_addr being non-NULL) we want to carry on with the
3385 rest of them. Also, it is desirable to send more than one message down the SMTP
3386 connection if there are several waiting, provided we haven't already sent so
3387 many as to hit the configured limit. The function transport_check_waiting looks
3388 for a waiting message and returns its id. Then transport_pass_socket tries to
3389 set up a continued delivery by passing the socket on to another process. The
3390 variable send_rset is FALSE if a message has just been successfully transfered.
3392 If we are already sending down a continued channel, there may be further
3393 addresses not yet delivered that are aimed at the same host, but which have not
3394 been passed in this run of the transport. In this case, continue_more will be
3395 true, and all we should do is send RSET if necessary, and return, leaving the
3398 However, if no address was disposed of, i.e. all addresses got 4xx errors, we
3399 do not want to continue with other messages down the same channel, because that
3400 can lead to looping between two or more messages, all with the same,
3401 temporarily failing address(es). [The retry information isn't updated yet, so
3402 new processes keep on trying.] We probably also don't want to try more of this
3403 message's addresses either.
3405 If we have started a TLS session, we have to end it before passing the
3406 connection to a new process. However, not all servers can handle this (Exim
3407 can), so we do not pass such a connection on if the host matches
3408 hosts_nopass_tls. */
3411 debug_printf("ok=%d send_quit=%d send_rset=%d continue_more=%d "
3412 "yield=%d first_address is %sNULL\n", sx.ok, sx.send_quit,
3413 sx.send_rset, continue_more, yield, sx.first_addr ? "not " : "");
3415 if (sx.completed_addr && sx.ok && sx.send_quit)
3418 smtp_compare_t t_compare;
3420 t_compare.tblock = tblock;
3421 t_compare.current_sender_address = sender_address;
3423 if ( sx.first_addr != NULL
3427 ( tls_out.active < 0 && !continue_proxy_cipher
3428 || verify_check_given_host(&sx.ob->hosts_nopass_tls, host) != OK
3432 transport_check_waiting(tblock->name, host->name,
3433 tblock->connection_max_messages, new_message_id, &more,
3434 (oicf)smtp_are_same_identities, (void*)&t_compare)
3441 if (! (sx.ok = smtp_write_command(&sx.outblock, SCMD_FLUSH, "RSET\r\n") >= 0))
3443 msg = US string_sprintf("send() to %s [%s] failed: %s", host->name,
3444 host->address, strerror(errno));
3445 sx.send_quit = FALSE;
3447 else if (! (sx.ok = smtp_read_response(&sx.inblock, sx.buffer,
3448 sizeof(sx.buffer), '2', sx.ob->command_timeout)))
3451 sx.send_quit = check_response(host, &errno, 0, sx.buffer, &code, &msg,
3455 DEBUG(D_transport) debug_printf("H=%s [%s] %s\n",
3456 host->name, host->address, msg);
3460 /* Either RSET was not needed, or it succeeded */
3465 int socket_fd = sx.inblock.sock;
3468 if (sx.first_addr != NULL) /* More addresses still to be sent */
3469 { /* in this run of the transport */
3470 continue_sequence++; /* Causes * in logging */
3474 /* Unless caller said it already has more messages listed for this host,
3475 pass the connection on to a new Exim process (below, the call to
3476 transport_pass_socket). If the caller has more ready, just return with
3477 the connection still open. */
3480 if (tls_out.active >= 0)
3482 || verify_check_given_host(&sx.ob->hosts_noproxy_tls, host) == OK)
3484 /* Before passing the socket on, or returning to caller with it still
3485 open, we must shut down TLS. Not all MTAs allow for the continuation
3486 of the SMTP session when TLS is shut down. We test for this by sending
3487 a new EHLO. If we don't get a good response, we don't attempt to pass
3490 tls_close(FALSE, TLS_SHUTDOWN_WAIT);
3491 smtp_peer_options = smtp_peer_options_wrap;
3493 && smtp_write_command(&sx.outblock, SCMD_FLUSH,
3494 "EHLO %s\r\n", sx.helo_data) >= 0
3495 && smtp_read_response(&sx.inblock, sx.buffer, sizeof(sx.buffer),
3496 '2', sx.ob->command_timeout);
3498 if (sx.ok && continue_more)
3499 return yield; /* More addresses for another run */
3503 /* Set up a pipe for proxying TLS for the new transport process */
3505 smtp_peer_options |= OPTION_TLS;
3506 if (sx.ok = (socketpair(AF_UNIX, SOCK_STREAM, 0, pfd) == 0))
3509 set_errno(sx.first_addr, errno, US"internal allocation problem",
3511 # ifdef EXPERIMENTAL_DSN_INFO
3512 , sx.smtp_greeting, sx.helo_response
3519 return yield; /* More addresses for another run */
3521 /* If the socket is successfully passed, we mustn't send QUIT (or
3522 indeed anything!) from here. */
3524 /*XXX DSN_INFO: assume likely to do new HELO; but for greet we'll want to
3525 propagate it from the initial
3527 if (sx.ok && transport_pass_socket(tblock->name, host->name,
3528 host->address, new_message_id, socket_fd))
3530 sx.send_quit = FALSE;
3532 /* We have passed the client socket to a fresh transport process.
3533 If TLS is still active, we need to proxy it for the transport we
3534 just passed the baton to. Fork a child to to do it, and return to
3535 get logging done asap. Which way to place the work makes assumptions
3536 about post-fork prioritisation which may not hold on all platforms. */
3538 if (tls_out.active >= 0)
3541 if (pid == 0) /* child; fork again to disconnect totally */
3543 if (running_in_test_harness) millisleep(100); /* let parent debug out */
3544 /* does not return */
3545 smtp_proxy_tls(sx.buffer, sizeof(sx.buffer), pfd,
3546 sx.ob->command_timeout);
3549 if (pid > 0) /* parent */
3551 DEBUG(D_transport) debug_printf("proxy-proc inter-pid %d\n", pid);
3553 /* tidy the inter-proc to disconn the proxy proc */
3554 waitpid(pid, NULL, 0);
3555 tls_close(FALSE, TLS_NO_SHUTDOWN);
3556 (void)close(sx.inblock.sock);
3557 continue_transport = NULL;
3558 continue_hostname = NULL;
3561 log_write(0, LOG_PANIC_DIE, "fork failed");
3567 /* If RSET failed and there are addresses left, they get deferred. */
3569 set_errno(sx.first_addr, errno, msg, DEFER, FALSE, host
3570 #ifdef EXPERIMENTAL_DSN_INFO
3571 , sx.smtp_greeting, sx.helo_response
3577 /* End off tidily with QUIT unless the connection has died or the socket has
3578 been passed to another process. There has been discussion on the net about what
3579 to do after sending QUIT. The wording of the RFC suggests that it is necessary
3580 to wait for a response, but on the other hand, there isn't anything one can do
3581 with an error response, other than log it. Exim used to do that. However,
3582 further discussion suggested that it is positively advantageous not to wait for
3583 the response, but to close the session immediately. This is supposed to move
3584 the TCP/IP TIME_WAIT state from the server to the client, thereby removing some
3585 load from the server. (Hosts that are both servers and clients may not see much
3586 difference, of course.) Further discussion indicated that this was safe to do
3587 on Unix systems which have decent implementations of TCP/IP that leave the
3588 connection around for a while (TIME_WAIT) after the application has gone away.
3589 This enables the response sent by the server to be properly ACKed rather than
3590 timed out, as can happen on broken TCP/IP implementations on other OS.
3592 This change is being made on 31-Jul-98. After over a year of trouble-free
3593 operation, the old commented-out code was removed on 17-Sep-99. */
3596 if (sx.send_quit) (void)smtp_write_command(&sx.outblock, SCMD_FLUSH, "QUIT\r\n");
3601 tls_close(FALSE, TLS_SHUTDOWN_NOWAIT);
3604 /* Close the socket, and return the appropriate value, first setting
3605 works because the NULL setting is passed back to the calling process, and
3606 remote_max_parallel is forced to 1 when delivering over an existing connection,
3608 If all went well and continue_more is set, we shouldn't actually get here if
3609 there are further addresses, as the return above will be taken. However,
3610 writing RSET might have failed, or there may be other addresses whose hosts are
3611 specified in the transports, and therefore not visible at top level, in which
3612 case continue_more won't get set. */
3614 HDEBUG(D_transport|D_acl|D_v) debug_printf_indent(" SMTP(close)>>\n");
3617 shutdown(sx.outblock.sock, SHUT_WR);
3618 if (fcntl(sx.inblock.sock, F_SETFL, O_NONBLOCK) == 0)
3619 for (rc = 16; read(sx.inblock.sock, sx.inbuffer, sizeof(sx.inbuffer)) > 0 && rc > 0;)
3620 rc--; /* drain socket */
3622 (void)close(sx.inblock.sock);
3624 #ifndef DISABLE_EVENT
3625 (void) event_raise(tblock->event_action, US"tcp:close", NULL);
3628 continue_transport = NULL;
3629 continue_hostname = NULL;
3636 /*************************************************
3637 * Closedown entry point *
3638 *************************************************/
3640 /* This function is called when exim is passed an open smtp channel
3641 from another incarnation, but the message which it has been asked
3642 to deliver no longer exists. The channel is on stdin.
3644 We might do fancy things like looking for another message to send down
3645 the channel, but if the one we sought has gone, it has probably been
3646 delivered by some other process that itself will seek further messages,
3647 so just close down our connection.
3649 Argument: pointer to the transport instance block
3654 smtp_transport_closedown(transport_instance *tblock)
3656 smtp_transport_options_block *ob =
3657 (smtp_transport_options_block *)tblock->options_block;
3658 smtp_inblock inblock;
3659 smtp_outblock outblock;
3661 uschar inbuffer[4096];
3662 uschar outbuffer[16];
3664 inblock.sock = fileno(stdin);
3665 inblock.buffer = inbuffer;
3666 inblock.buffersize = sizeof(inbuffer);
3667 inblock.ptr = inbuffer;
3668 inblock.ptrend = inbuffer;
3670 outblock.sock = inblock.sock;
3671 outblock.buffersize = sizeof(outbuffer);
3672 outblock.buffer = outbuffer;
3673 outblock.ptr = outbuffer;
3674 outblock.cmd_count = 0;
3675 outblock.authenticating = FALSE;
3677 (void)smtp_write_command(&outblock, SCMD_FLUSH, "QUIT\r\n");
3678 (void)smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
3679 ob->command_timeout);
3680 (void)close(inblock.sock);
3685 /*************************************************
3686 * Prepare addresses for delivery *
3687 *************************************************/
3689 /* This function is called to flush out error settings from previous delivery
3690 attempts to other hosts. It also records whether we got here via an MX record
3691 or not in the more_errno field of the address. We are interested only in
3692 addresses that are still marked DEFER - others may have got delivered to a
3693 previously considered IP address. Set their status to PENDING_DEFER to indicate
3694 which ones are relevant this time.
3697 addrlist the list of addresses
3698 host the host we are delivering to
3700 Returns: the first address for this delivery
3703 static address_item *
3704 prepare_addresses(address_item *addrlist, host_item *host)
3706 address_item *first_addr = NULL;
3708 for (addr = addrlist; addr; addr = addr->next)
3709 if (addr->transport_return == DEFER)
3711 if (!first_addr) first_addr = addr;
3712 addr->transport_return = PENDING_DEFER;
3713 addr->basic_errno = 0;
3714 addr->more_errno = (host->mx >= 0)? 'M' : 'A';
3715 addr->message = NULL;
3717 addr->cipher = NULL;
3718 addr->ourcert = NULL;
3719 addr->peercert = NULL;
3720 addr->peerdn = NULL;
3721 addr->ocsp = OCSP_NOT_REQ;
3723 #ifdef EXPERIMENTAL_DSN_INFO
3724 addr->smtp_greeting = NULL;
3725 addr->helo_response = NULL;
3733 /*************************************************
3734 * Main entry point *
3735 *************************************************/
3737 /* See local README for interface details. As this is a remote transport, it is
3738 given a chain of addresses to be delivered in one connection, if possible. It
3739 always returns TRUE, indicating that each address has its own independent
3740 status set, except if there is a setting up problem, in which case it returns
3744 smtp_transport_entry(
3745 transport_instance *tblock, /* data for this instantiation */
3746 address_item *addrlist) /* addresses we are working on */
3750 int hosts_defer = 0;
3752 int hosts_looked_up = 0;
3753 int hosts_retry = 0;
3754 int hosts_serial = 0;
3755 int hosts_total = 0;
3756 int total_hosts_tried = 0;
3758 BOOL expired = TRUE;
3759 uschar *expanded_hosts = NULL;
3761 uschar *tid = string_sprintf("%s transport", tblock->name);
3762 smtp_transport_options_block *ob =
3763 (smtp_transport_options_block *)(tblock->options_block);
3764 host_item *hostlist = addrlist->host_list;
3769 debug_printf("%s transport entered\n", tblock->name);
3770 for (addr = addrlist; addr; addr = addr->next)
3771 debug_printf(" %s\n", addr->address);
3774 debug_printf("hostlist:\n");
3775 for (host = hostlist; host; host = host->next)
3776 debug_printf(" '%s' IP %s port %d\n", host->name, host->address, host->port);
3778 if (continue_hostname)
3779 debug_printf("already connected to %s [%s] (on fd %d)\n",
3780 continue_hostname, continue_host_address,
3781 cutthrough.fd >= 0 ? cutthrough.fd : 0);
3784 /* Set the flag requesting that these hosts be added to the waiting
3785 database if the delivery fails temporarily or if we are running with
3786 queue_smtp or a 2-stage queue run. This gets unset for certain
3787 kinds of error, typically those that are specific to the message. */
3789 update_waiting = TRUE;
3791 /* If a host list is not defined for the addresses - they must all have the
3792 same one in order to be passed to a single transport - or if the transport has
3793 a host list with hosts_override set, use the host list supplied with the
3794 transport. It is an error for this not to exist. */
3796 if (!hostlist || (ob->hosts_override && ob->hosts))
3800 addrlist->message = string_sprintf("%s transport called with no hosts set",
3802 addrlist->transport_return = PANIC;
3803 return FALSE; /* Only top address has status */
3806 DEBUG(D_transport) debug_printf("using the transport's hosts: %s\n",
3809 /* If the transport's host list contains no '$' characters, and we are not
3810 randomizing, it is fixed and therefore a chain of hosts can be built once
3811 and for all, and remembered for subsequent use by other calls to this
3812 transport. If, on the other hand, the host list does contain '$', or we are
3813 randomizing its order, we have to rebuild it each time. In the fixed case,
3814 as the hosts string will never be used again, it doesn't matter that we
3815 replace all the : characters with zeros. */
3819 uschar *s = ob->hosts;
3821 if (Ustrchr(s, '$') != NULL)
3823 if (!(expanded_hosts = expand_string(s)))
3825 addrlist->message = string_sprintf("failed to expand list of hosts "
3826 "\"%s\" in %s transport: %s", s, tblock->name, expand_string_message);
3827 addrlist->transport_return = search_find_defer ? DEFER : PANIC;
3828 return FALSE; /* Only top address has status */
3830 DEBUG(D_transport) debug_printf("expanded list of hosts \"%s\" to "
3831 "\"%s\"\n", s, expanded_hosts);
3835 if (ob->hosts_randomize) s = expanded_hosts = string_copy(s);
3837 host_build_hostlist(&hostlist, s, ob->hosts_randomize);
3839 /* Check that the expansion yielded something useful. */
3843 string_sprintf("%s transport has empty hosts setting", tblock->name);
3844 addrlist->transport_return = PANIC;
3845 return FALSE; /* Only top address has status */
3848 /* If there was no expansion of hosts, save the host list for
3851 if (!expanded_hosts) ob->hostlist = hostlist;
3854 /* This is not the first time this transport has been run in this delivery;
3855 the host list was built previously. */
3858 hostlist = ob->hostlist;
3861 /* The host list was supplied with the address. If hosts_randomize is set, we
3862 must sort it into a random order if it did not come from MX records and has not
3863 already been randomized (but don't bother if continuing down an existing
3866 else if (ob->hosts_randomize && hostlist->mx == MX_NONE && !continue_hostname)
3868 host_item *newlist = NULL;
3871 host_item *h = hostlist;
3872 hostlist = hostlist->next;
3874 h->sort_key = random_number(100);
3881 else if (h->sort_key < newlist->sort_key)
3888 host_item *hh = newlist;
3891 if (h->sort_key < hh->next->sort_key) break;
3899 hostlist = addrlist->host_list = newlist;
3902 /* Sort out the default port. */
3904 if (!smtp_get_port(ob->port, addrlist, &defport, tid)) return FALSE;
3906 /* For each host-plus-IP-address on the list:
3908 . If this is a continued delivery and the host isn't the one with the
3909 current connection, skip.
3911 . If the status is unusable (i.e. previously failed or retry checked), skip.
3913 . If no IP address set, get the address, either by turning the name into
3914 an address, calling gethostbyname if gethostbyname is on, or by calling
3915 the DNS. The DNS may yield multiple addresses, in which case insert the
3916 extra ones into the list.
3918 . Get the retry data if not previously obtained for this address and set the
3919 field which remembers the state of this address. Skip if the retry time is
3920 not reached. If not, remember whether retry data was found. The retry string
3921 contains both the name and the IP address.
3923 . Scan the list of addresses and mark those whose status is DEFER as
3924 PENDING_DEFER. These are the only ones that will be processed in this cycle
3927 . Make a delivery attempt - addresses marked PENDING_DEFER will be tried.
3928 Some addresses may be successfully delivered, others may fail, and yet
3929 others may get temporary errors and so get marked DEFER.
3931 . The return from the delivery attempt is OK if a connection was made and a
3932 valid SMTP dialogue was completed. Otherwise it is DEFER.
3934 . If OK, add a "remove" retry item for this host/IPaddress, if any.
3936 . If fail to connect, or other defer state, add a retry item.
3938 . If there are any addresses whose status is still DEFER, carry on to the
3939 next host/IPaddress, unless we have tried the number of hosts given
3940 by hosts_max_try or hosts_max_try_hardlimit; otherwise return. Note that
3941 there is some fancy logic for hosts_max_try that means its limit can be
3942 overstepped in some circumstances.
3944 If we get to the end of the list, all hosts have deferred at least one address,
3945 or not reached their retry times. If delay_after_cutoff is unset, it requests a
3946 delivery attempt to those hosts whose last try was before the arrival time of
3947 the current message. To cope with this, we have to go round the loop a second
3948 time. After that, set the status and error data for any addresses that haven't
3949 had it set already. */
3951 for (cutoff_retry = 0;
3952 expired && cutoff_retry < (ob->delay_after_cutoff ? 1 : 2);
3955 host_item *nexthost = NULL;
3956 int unexpired_hosts_tried = 0;
3957 BOOL continue_host_tried = FALSE;
3959 retry_non_continued:
3960 for (host = hostlist;
3962 && unexpired_hosts_tried < ob->hosts_max_try
3963 && total_hosts_tried < ob->hosts_max_try_hardlimit;
3969 BOOL host_is_expired = FALSE;
3970 BOOL message_defer = FALSE;
3971 BOOL some_deferred = FALSE;
3972 address_item *first_addr = NULL;
3973 uschar *interface = NULL;
3974 uschar *retry_host_key = NULL;
3975 uschar *retry_message_key = NULL;
3976 uschar *serialize_key = NULL;
3978 /* Default next host is next host. :-) But this can vary if the
3979 hosts_max_try limit is hit (see below). It may also be reset if a host
3980 address is looked up here (in case the host was multihomed). */
3982 nexthost = host->next;
3984 /* If the address hasn't yet been obtained from the host name, look it up
3985 now, unless the host is already marked as unusable. If it is marked as
3986 unusable, it means that the router was unable to find its IP address (in
3987 the DNS or wherever) OR we are in the 2nd time round the cutoff loop, and
3988 the lookup failed last time. We don't get this far if *all* MX records
3989 point to non-existent hosts; that is treated as a hard error.
3991 We can just skip this host entirely. When the hosts came from the router,
3992 the address will timeout based on the other host(s); when the address is
3993 looked up below, there is an explicit retry record added.
3995 Note that we mustn't skip unusable hosts if the address is not unset; they
3996 may be needed as expired hosts on the 2nd time round the cutoff loop. */
4000 int new_port, flags;
4003 if (host->status >= hstatus_unusable)
4005 DEBUG(D_transport) debug_printf("%s has no address and is unusable - skipping\n",
4010 DEBUG(D_transport) debug_printf("getting address for %s\n", host->name);
4012 /* The host name is permitted to have an attached port. Find it, and
4013 strip it from the name. Just remember it for now. */
4015 new_port = host_item_get_port(host);
4017 /* Count hosts looked up */
4021 /* Find by name if so configured, or if it's an IP address. We don't
4022 just copy the IP address, because we need the test-for-local to happen. */
4024 flags = HOST_FIND_BY_A | HOST_FIND_BY_AAAA;
4025 if (ob->dns_qualify_single) flags |= HOST_FIND_QUALIFY_SINGLE;
4026 if (ob->dns_search_parents) flags |= HOST_FIND_SEARCH_PARENTS;
4028 if (ob->gethostbyname || string_is_ip_address(host->name, NULL) != 0)
4029 rc = host_find_byname(host, NULL, flags, NULL, TRUE);
4031 rc = host_find_bydns(host, NULL, flags, NULL, NULL, NULL,
4032 &ob->dnssec, /* domains for request/require */
4035 /* Update the host (and any additional blocks, resulting from
4036 multihoming) with a host-specific port, if any. */
4038 for (hh = host; hh != nexthost; hh = hh->next) hh->port = new_port;
4040 /* Failure to find the host at this time (usually DNS temporary failure)
4041 is really a kind of routing failure rather than a transport failure.
4042 Therefore we add a retry item of the routing kind, not to stop us trying
4043 to look this name up here again, but to ensure the address gets timed
4044 out if the failures go on long enough. A complete failure at this point
4045 commonly points to a configuration error, but the best action is still
4046 to carry on for the next host. */
4048 if (rc == HOST_FIND_AGAIN || rc == HOST_FIND_SECURITY || rc == HOST_FIND_FAILED)
4050 retry_add_item(addrlist, string_sprintf("R:%s", host->name), 0);
4052 if (rc == HOST_FIND_AGAIN) hosts_defer++; else hosts_fail++;
4053 DEBUG(D_transport) debug_printf("rc = %s for %s\n", (rc == HOST_FIND_AGAIN)?
4054 "HOST_FIND_AGAIN" : "HOST_FIND_FAILED", host->name);
4055 host->status = hstatus_unusable;
4057 for (addr = addrlist; addr; addr = addr->next)
4059 if (addr->transport_return != DEFER) continue;
4060 addr->basic_errno = ERRNO_UNKNOWNHOST;
4061 addr->message = string_sprintf(
4062 rc == HOST_FIND_SECURITY
4063 ? "lookup of IP address for %s was insecure"
4064 : "failed to lookup IP address for %s",
4070 /* If the host is actually the local host, we may have a problem, or
4071 there may be some cunning configuration going on. In the problem case,
4072 log things and give up. The default transport status is already DEFER. */
4074 if (rc == HOST_FOUND_LOCAL && !ob->allow_localhost)
4076 for (addr = addrlist; addr; addr = addr->next)
4078 addr->basic_errno = 0;
4079 addr->message = string_sprintf("%s transport found host %s to be "
4080 "local", tblock->name, host->name);
4084 } /* End of block for IP address lookup */
4086 /* If this is a continued delivery, we are interested only in the host
4087 which matches the name of the existing open channel. The check is put
4088 here after the local host lookup, in case the name gets expanded as a
4089 result of the lookup. Set expired FALSE, to save the outer loop executing
4092 if (continue_hostname)
4093 if ( Ustrcmp(continue_hostname, host->name) != 0
4094 || Ustrcmp(continue_host_address, host->address) != 0
4098 continue; /* With next host */
4101 continue_host_tried = TRUE;
4103 /* Reset the default next host in case a multihomed host whose addresses
4104 are not looked up till just above added to the host list. */
4106 nexthost = host->next;
4108 /* If queue_smtp is set (-odqs or the first part of a 2-stage run), or the
4109 domain is in queue_smtp_domains, we don't actually want to attempt any
4110 deliveries. When doing a queue run, queue_smtp_domains is always unset. If
4111 there is a lookup defer in queue_smtp_domains, proceed as if the domain
4112 were not in it. We don't want to hold up all SMTP deliveries! Except when
4113 doing a two-stage queue run, don't do this if forcing. */
4115 if ((!deliver_force || queue_2stage) && (queue_smtp ||
4116 match_isinlist(addrlist->domain,
4117 (const uschar **)&queue_smtp_domains, 0,
4118 &domainlist_anchor, NULL, MCL_DOMAIN, TRUE, NULL) == OK))
4121 for (addr = addrlist; addr; addr = addr->next)
4122 if (addr->transport_return == DEFER)
4123 addr->message = US"domain matches queue_smtp_domains, or -odqs set";
4124 continue; /* With next host */
4127 /* Count hosts being considered - purely for an intelligent comment
4128 if none are usable. */
4132 /* Set $host and $host address now in case they are needed for the
4133 interface expansion or the serialize_hosts check; they remain set if an
4134 actual delivery happens. */
4136 deliver_host = host->name;
4137 deliver_host_address = host->address;
4138 lookup_dnssec_authenticated = host->dnssec == DS_YES ? US"yes"
4139 : host->dnssec == DS_NO ? US"no"
4142 /* Set up a string for adding to the retry key if the port number is not
4143 the standard SMTP port. A host may have its own port setting that overrides
4146 pistring = string_sprintf(":%d", host->port == PORT_NONE
4147 ? defport : host->port);
4148 if (Ustrcmp(pistring, ":25") == 0) pistring = US"";
4150 /* Select IPv4 or IPv6, and choose an outgoing interface. If the interface
4151 string is set, even if constant (as different transports can have different
4152 constant settings), we must add it to the key that is used for retries,
4153 because connections to the same host from a different interface should be
4154 treated separately. */
4156 host_af = Ustrchr(host->address, ':') == NULL ? AF_INET : AF_INET6;
4157 if ((rs = ob->interface) && *rs)
4159 if (!smtp_get_interface(rs, host_af, addrlist, &interface, tid))
4161 pistring = string_sprintf("%s/%s", pistring, interface);
4164 /* The first time round the outer loop, check the status of the host by
4165 inspecting the retry data. The second time round, we are interested only
4166 in expired hosts that haven't been tried since this message arrived. */
4168 if (cutoff_retry == 0)
4171 /* Ensure the status of the address is set by checking retry data if
4172 necessary. There may be host-specific retry data (applicable to all
4173 messages) and also data for retries of a specific message at this host.
4174 If either of these retry records are actually read, the keys used are
4175 returned to save recomputing them later. */
4177 if (exp_bool(addrlist, US"transport", tblock->name, D_transport,
4178 US"retry_include_ip_address", ob->retry_include_ip_address,
4179 ob->expand_retry_include_ip_address, &incl_ip) != OK)
4180 continue; /* with next host */
4182 host_is_expired = retry_check_address(addrlist->domain, host, pistring,
4183 incl_ip, &retry_host_key, &retry_message_key);
4185 DEBUG(D_transport) debug_printf("%s [%s]%s retry-status = %s\n", host->name,
4186 (host->address == NULL)? US"" : host->address, pistring,
4187 (host->status == hstatus_usable)? "usable" :
4188 (host->status == hstatus_unusable)? "unusable" :
4189 (host->status == hstatus_unusable_expired)? "unusable (expired)" : "?");
4191 /* Skip this address if not usable at this time, noting if it wasn't
4192 actually expired, both locally and in the address. */
4194 switch (host->status)
4196 case hstatus_unusable:
4198 setflag(addrlist, af_retry_skipped);
4201 case hstatus_unusable_expired:
4204 case hwhy_retry: hosts_retry++; break;
4205 case hwhy_failed: hosts_fail++; break;
4207 case hwhy_deferred: hosts_defer++; break;
4210 /* If there was a retry message key, implying that previously there
4211 was a message-specific defer, we don't want to update the list of
4212 messages waiting for these hosts. */
4214 if (retry_message_key) update_waiting = FALSE;
4215 continue; /* With the next host or IP address */
4219 /* Second time round the loop: if the address is set but expired, and
4220 the message is newer than the last try, let it through. */
4225 || host->status != hstatus_unusable_expired
4226 || host->last_try > received_time.tv_sec)
4228 DEBUG(D_transport) debug_printf("trying expired host %s [%s]%s\n",
4229 host->name, host->address, pistring);
4230 host_is_expired = TRUE;
4233 /* Setting "expired=FALSE" doesn't actually mean not all hosts are expired;
4234 it remains TRUE only if all hosts are expired and none are actually tried.
4239 /* If this host is listed as one to which access must be serialized,
4240 see if another Exim process has a connection to it, and if so, skip
4241 this host. If not, update the database to record our connection to it
4242 and remember this for later deletion. Do not do any of this if we are
4243 sending the message down a pre-existing connection. */
4245 if ( !continue_hostname
4246 && verify_check_given_host(&ob->serialize_hosts, host) == OK)
4248 serialize_key = string_sprintf("host-serialize-%s", host->name);
4249 if (!enq_start(serialize_key, 1))
4252 debug_printf("skipping host %s because another Exim process "
4253 "is connected to it\n", host->name);
4259 /* OK, we have an IP address that is not waiting for its retry time to
4260 arrive (it might be expired) OR (second time round the loop) we have an
4261 expired host that hasn't been tried since the message arrived. Have a go
4262 at delivering the message to it. First prepare the addresses by flushing
4263 out the result of previous attempts, and finding the first address that
4264 is still to be delivered. */
4266 first_addr = prepare_addresses(addrlist, host);
4268 DEBUG(D_transport) debug_printf("delivering %s to %s [%s] (%s%s)\n",
4269 message_id, host->name, host->address, addrlist->address,
4270 addrlist->next ? ", ..." : "");
4272 set_process_info("delivering %s to %s [%s] (%s%s)",
4273 message_id, host->name, host->address, addrlist->address,
4274 addrlist->next ? ", ..." : "");
4276 /* This is not for real; don't do the delivery. If there are
4277 any remaining hosts, list them. */
4282 set_errno_nohost(addrlist, 0, NULL, OK, FALSE);
4283 for (addr = addrlist; addr; addr = addr->next)
4285 addr->host_used = host;
4286 addr->special_action = '*';
4287 addr->message = US"delivery bypassed by -N option";
4291 debug_printf("*** delivery by %s transport bypassed by -N option\n"
4292 "*** host and remaining hosts:\n", tblock->name);
4293 for (host2 = host; host2; host2 = host2->next)
4294 debug_printf(" %s [%s]\n", host2->name,
4295 host2->address ? host2->address : US"unset");
4300 /* This is for real. If the host is expired, we don't count it for
4301 hosts_max_retry. This ensures that all hosts must expire before an address
4302 is timed out, unless hosts_max_try_hardlimit (which protects against
4303 lunatic DNS configurations) is reached.
4305 If the host is not expired and we are about to hit the hosts_max_retry
4306 limit, check to see if there is a subsequent hosts with a different MX
4307 value. If so, make that the next host, and don't count this one. This is a
4308 heuristic to make sure that different MXs do get tried. With a normal kind
4309 of retry rule, they would get tried anyway when the earlier hosts were
4310 delayed, but if the domain has a "retry every time" type of rule - as is
4311 often used for the the very large ISPs, that won't happen. */
4316 /* Make a copy of the host if it is local to this invocation
4317 of the transport. */
4321 thost = store_get(sizeof(host_item));
4323 thost->name = string_copy(host->name);
4324 thost->address = string_copy(host->address);
4329 if (!host_is_expired && ++unexpired_hosts_tried >= ob->hosts_max_try)
4333 debug_printf("hosts_max_try limit reached with this host\n");
4334 for (h = host; h; h = h->next) if (h->mx != host->mx)
4337 unexpired_hosts_tried--;
4338 DEBUG(D_transport) debug_printf("however, a higher MX host exists "
4339 "and will be tried\n");
4344 /* Attempt the delivery. */
4346 total_hosts_tried++;
4347 rc = smtp_deliver(addrlist, thost, host_af, defport, interface, tblock,
4348 &message_defer, FALSE);
4351 OK => connection made, each address contains its result;
4352 message_defer is set for message-specific defers (when all
4353 recipients are marked defer)
4354 DEFER => there was a non-message-specific delivery problem;
4355 ERROR => there was a problem setting up the arguments for a filter,
4356 or there was a problem with expanding added headers
4359 /* If the result is not OK, there was a non-message-specific problem.
4360 If the result is DEFER, we need to write to the logs saying what happened
4361 for this particular host, except in the case of authentication and TLS
4362 failures, where the log has already been written. If all hosts defer a
4363 general message is written at the end. */
4365 if (rc == DEFER && first_addr->basic_errno != ERRNO_AUTHFAIL
4366 && first_addr->basic_errno != ERRNO_TLSFAILURE)
4367 write_logs(host, first_addr->message, first_addr->basic_errno);
4369 #ifndef DISABLE_EVENT
4371 deferred_event_raise(first_addr, host);
4374 /* If STARTTLS was accepted, but there was a failure in setting up the
4375 TLS session (usually a certificate screwup), and the host is not in
4376 hosts_require_tls, and tls_tempfail_tryclear is true, try again, with
4377 TLS forcibly turned off. We have to start from scratch with a new SMTP
4378 connection. That's why the retry is done from here, not from within
4379 smtp_deliver(). [Rejections of STARTTLS itself don't screw up the
4380 session, so the in-clear transmission after those errors, if permitted,
4381 happens inside smtp_deliver().] */
4385 && first_addr->basic_errno == ERRNO_TLSFAILURE
4386 && ob->tls_tempfail_tryclear
4387 && verify_check_given_host(&ob->hosts_require_tls, host) != OK
4390 log_write(0, LOG_MAIN,
4391 "%s: delivering unencrypted to H=%s [%s] (not in hosts_require_tls)",
4392 first_addr->message, host->name, host->address);
4393 first_addr = prepare_addresses(addrlist, host);
4394 rc = smtp_deliver(addrlist, thost, host_af, defport, interface, tblock,
4395 &message_defer, TRUE);
4396 if (rc == DEFER && first_addr->basic_errno != ERRNO_AUTHFAIL)
4397 write_logs(host, first_addr->message, first_addr->basic_errno);
4398 # ifndef DISABLE_EVENT
4400 deferred_event_raise(first_addr, host);
4403 #endif /*SUPPORT_TLS*/
4406 /* Delivery attempt finished */
4408 rs = rc == OK ? US"OK"
4409 : rc == DEFER ? US"DEFER"
4410 : rc == ERROR ? US"ERROR"
4413 set_process_info("delivering %s: just tried %s [%s] for %s%s: result %s",
4414 message_id, host->name, host->address, addrlist->address,
4415 addrlist->next ? " (& others)" : "", rs);
4417 /* Release serialization if set up */
4419 if (serialize_key) enq_end(serialize_key);
4421 /* If the result is DEFER, or if a host retry record is known to exist, we
4422 need to add an item to the retry chain for updating the retry database
4423 at the end of delivery. We only need to add the item to the top address,
4424 of course. Also, if DEFER, we mark the IP address unusable so as to skip it
4425 for any other delivery attempts using the same address. (It is copied into
4426 the unusable tree at the outer level, so even if different address blocks
4427 contain the same address, it still won't get tried again.) */
4429 if (rc == DEFER || retry_host_key)
4431 int delete_flag = rc != DEFER ? rf_delete : 0;
4432 if (!retry_host_key)
4435 if (exp_bool(addrlist, US"transport", tblock->name, D_transport,
4436 US"retry_include_ip_address", ob->retry_include_ip_address,
4437 ob->expand_retry_include_ip_address, &incl_ip) != OK)
4438 incl_ip = TRUE; /* error; use most-specific retry record */
4440 retry_host_key = incl_ip
4441 ? string_sprintf("T:%S:%s%s", host->name, host->address, pistring)
4442 : string_sprintf("T:%S%s", host->name, pistring);
4445 /* If a delivery of another message over an existing SMTP connection
4446 yields DEFER, we do NOT set up retry data for the host. This covers the
4447 case when there are delays in routing the addresses in the second message
4448 that are so long that the server times out. This is alleviated by not
4449 routing addresses that previously had routing defers when handling an
4450 existing connection, but even so, this case may occur (e.g. if a
4451 previously happily routed address starts giving routing defers). If the
4452 host is genuinely down, another non-continued message delivery will
4453 notice it soon enough. */
4455 if (delete_flag != 0 || !continue_hostname)
4456 retry_add_item(first_addr, retry_host_key, rf_host | delete_flag);
4458 /* We may have tried an expired host, if its retry time has come; ensure
4459 the status reflects the expiry for the benefit of any other addresses. */
4463 host->status = host_is_expired
4464 ? hstatus_unusable_expired : hstatus_unusable;
4465 host->why = hwhy_deferred;
4469 /* If message_defer is set (host was OK, but every recipient got deferred
4470 because of some message-specific problem), or if that had happened
4471 previously so that a message retry key exists, add an appropriate item
4472 to the retry chain. Note that if there was a message defer but now there is
4473 a host defer, the message defer record gets deleted. That seems perfectly
4474 reasonable. Also, stop the message from being remembered as waiting
4475 for specific hosts. */
4477 if (message_defer || retry_message_key)
4479 int delete_flag = message_defer ? 0 : rf_delete;
4480 if (!retry_message_key)
4483 if (exp_bool(addrlist, US"transport", tblock->name, D_transport,
4484 US"retry_include_ip_address", ob->retry_include_ip_address,
4485 ob->expand_retry_include_ip_address, &incl_ip) != OK)
4486 incl_ip = TRUE; /* error; use most-specific retry record */
4488 retry_message_key = incl_ip
4489 ? string_sprintf("T:%S:%s%s:%s", host->name, host->address, pistring,
4491 : string_sprintf("T:%S%s:%s", host->name, pistring, message_id);
4493 retry_add_item(addrlist, retry_message_key,
4494 rf_message | rf_host | delete_flag);
4495 update_waiting = FALSE;
4498 /* Any return other than DEFER (that is, OK or ERROR) means that the
4499 addresses have got their final statuses filled in for this host. In the OK
4500 case, see if any of them are deferred. */
4503 for (addr = addrlist; addr; addr = addr->next)
4504 if (addr->transport_return == DEFER)
4506 some_deferred = TRUE;
4510 /* If no addresses deferred or the result was ERROR, return. We do this for
4511 ERROR because a failing filter set-up or add_headers expansion is likely to
4512 fail for any host we try. */
4514 if (rc == ERROR || (rc == OK && !some_deferred))
4516 DEBUG(D_transport) debug_printf("Leaving %s transport\n", tblock->name);
4517 return TRUE; /* Each address has its status */
4520 /* If the result was DEFER or some individual addresses deferred, let
4521 the loop run to try other hosts with the deferred addresses, except for the
4522 case when we were trying to deliver down an existing channel and failed.
4523 Don't try any other hosts in this case. */
4525 if (continue_hostname) break;
4527 /* If the whole delivery, or some individual addresses, were deferred and
4528 there are more hosts that could be tried, do not count this host towards
4529 the hosts_max_try limit if the age of the message is greater than the
4530 maximum retry time for this host. This means we may try try all hosts,
4531 ignoring the limit, when messages have been around for some time. This is
4532 important because if we don't try all hosts, the address will never time
4533 out. NOTE: this does not apply to hosts_max_try_hardlimit. */
4535 if ((rc == DEFER || some_deferred) && nexthost)
4538 retry_config *retry = retry_find_config(host->name, NULL, 0, 0);
4540 if (retry && retry->rules)
4542 retry_rule *last_rule;
4543 for (last_rule = retry->rules;
4545 last_rule = last_rule->next);
4546 timedout = time(NULL) - received_time.tv_sec > last_rule->timeout;
4548 else timedout = TRUE; /* No rule => timed out */
4552 unexpired_hosts_tried--;
4553 DEBUG(D_transport) debug_printf("temporary delivery error(s) override "
4554 "hosts_max_try (message older than host's retry time)\n");
4557 } /* End of loop for trying multiple hosts. */
4559 /* If we failed to find a matching host in the list, for an already-open
4560 connection, just close it and start over with the list. This can happen
4561 for routing that changes from run to run, or big multi-IP sites with
4564 if (continue_hostname && !continue_host_tried)
4566 int fd = cutthrough.fd >= 0 ? cutthrough.fd : 0;
4568 DEBUG(D_transport) debug_printf("no hosts match already-open connection\n");
4570 if (tls_out.active == fd)
4572 (void) tls_write(FALSE, US"QUIT\r\n", 6, FALSE);
4573 tls_close(FALSE, TLS_SHUTDOWN_NOWAIT);
4577 (void) write(fd, US"QUIT\r\n", 6);
4581 continue_hostname = NULL;
4582 goto retry_non_continued;
4585 /* This is the end of the loop that repeats iff expired is TRUE and
4586 ob->delay_after_cutoff is FALSE. The second time round we will
4587 try those hosts that haven't been tried since the message arrived. */
4591 debug_printf("all IP addresses skipped or deferred at least one address\n");
4592 if (expired && !ob->delay_after_cutoff && cutoff_retry == 0)
4593 debug_printf("retrying IP addresses not tried since message arrived\n");
4598 /* Get here if all IP addresses are skipped or defer at least one address. In
4599 MUA wrapper mode, this will happen only for connection or other non-message-
4600 specific failures. Force the delivery status for all addresses to FAIL. */
4604 for (addr = addrlist; addr; addr = addr->next)
4605 addr->transport_return = FAIL;
4609 /* In the normal, non-wrapper case, add a standard message to each deferred
4610 address if there hasn't been an error, that is, if it hasn't actually been
4611 tried this time. The variable "expired" will be FALSE if any deliveries were
4612 actually tried, or if there was at least one host that was not expired. That
4613 is, it is TRUE only if no deliveries were tried and all hosts were expired. If
4614 a delivery has been tried, an error code will be set, and the failing of the
4615 message is handled by the retry code later.
4617 If queue_smtp is set, or this transport was called to send a subsequent message
4618 down an existing TCP/IP connection, and something caused the host not to be
4619 found, we end up here, but can detect these cases and handle them specially. */
4621 for (addr = addrlist; addr; addr = addr->next)
4623 /* If host is not NULL, it means that we stopped processing the host list
4624 because of hosts_max_try or hosts_max_try_hardlimit. In the former case, this
4625 means we need to behave as if some hosts were skipped because their retry
4626 time had not come. Specifically, this prevents the address from timing out.
4627 However, if we have hit hosts_max_try_hardlimit, we want to behave as if all
4628 hosts were tried. */
4631 if (total_hosts_tried >= ob->hosts_max_try_hardlimit)
4634 debug_printf("hosts_max_try_hardlimit reached: behave as if all "
4635 "hosts were tried\n");
4640 debug_printf("hosts_max_try limit caused some hosts to be skipped\n");
4641 setflag(addr, af_retry_skipped);
4644 if (queue_smtp) /* no deliveries attempted */
4646 addr->transport_return = DEFER;
4647 addr->basic_errno = 0;
4648 addr->message = US"SMTP delivery explicitly queued";
4651 else if ( addr->transport_return == DEFER
4652 && (addr->basic_errno == ERRNO_UNKNOWNERROR || addr->basic_errno == 0)
4656 addr->basic_errno = ERRNO_HRETRY;
4657 if (continue_hostname)
4658 addr->message = US"no host found for existing SMTP connection";
4661 setflag(addr, af_pass_message); /* This is not a security risk */
4662 addr->message = string_sprintf(
4663 "all hosts%s have been failing for a long time %s",
4664 addr->domain ? string_sprintf(" for '%s'", addr->domain) : US"",
4665 ob->delay_after_cutoff
4666 ? US"(and retry time not reached)"
4667 : US"and were last tried after this message arrived");
4669 /* If we are already using fallback hosts, or there are no fallback hosts
4670 defined, convert the result to FAIL to cause a bounce. */
4672 if (addr->host_list == addr->fallback_hosts || !addr->fallback_hosts)
4673 addr->transport_return = FAIL;
4678 if (hosts_retry == hosts_total)
4679 s = "retry time not reached for any host%s";
4680 else if (hosts_fail == hosts_total)
4681 s = "all host address lookups%s failed permanently";
4682 else if (hosts_defer == hosts_total)
4683 s = "all host address lookups%s failed temporarily";
4684 else if (hosts_serial == hosts_total)
4685 s = "connection limit reached for all hosts%s";
4686 else if (hosts_fail+hosts_defer == hosts_total)
4687 s = "all host address lookups%s failed";
4689 s = "some host address lookups failed and retry time "
4690 "not reached for other hosts or connection limit reached%s";
4692 addr->message = string_sprintf(s,
4693 addr->domain ? string_sprintf(" for '%s'", addr->domain) : US"");
4698 /* Update the database which keeps information about which messages are waiting
4699 for which hosts to become available. For some message-specific errors, the
4700 update_waiting flag is turned off because we don't want follow-on deliveries in
4701 those cases. If this transport instance is explicitly limited to one message
4702 per connection then follow-on deliveries are not possible and there's no need
4703 to create/update the per-transport wait-<transport_name> database. */
4705 if (update_waiting && tblock->connection_max_messages != 1)
4706 transport_update_waiting(hostlist, tblock->name);
4710 DEBUG(D_transport) debug_printf("Leaving %s transport\n", tblock->name);
4712 return TRUE; /* Each address has its status */
4715 #endif /*!MACRO_PREDEF*/
4718 /* End of transport/smtp.c */