1 /*************************************************
2 * Exim - an Internet mail transport agent *
3 *************************************************/
5 /* Copyright (c) University of Cambridge 1995 - 2017 */
6 /* See the file NOTICE for conditions of use and distribution. */
12 /* Options specific to the smtp transport. This transport also supports LMTP
13 over TCP/IP. The options must be in alphabetic order (note that "_" comes
14 before the lower case letters). Some live in the transport_instance block so as
15 to be publicly visible; these are flagged with opt_public. */
17 optionlist smtp_transport_options[] = {
18 { "*expand_multi_domain", opt_stringptr | opt_hidden | opt_public,
19 (void *)offsetof(transport_instance, expand_multi_domain) },
20 { "*expand_retry_include_ip_address", opt_stringptr | opt_hidden,
21 (void *)(offsetof(smtp_transport_options_block, expand_retry_include_ip_address)) },
23 { "address_retry_include_sender", opt_bool,
24 (void *)offsetof(smtp_transport_options_block, address_retry_include_sender) },
25 { "allow_localhost", opt_bool,
26 (void *)offsetof(smtp_transport_options_block, allow_localhost) },
27 { "authenticated_sender", opt_stringptr,
28 (void *)offsetof(smtp_transport_options_block, authenticated_sender) },
29 { "authenticated_sender_force", opt_bool,
30 (void *)offsetof(smtp_transport_options_block, authenticated_sender_force) },
31 { "command_timeout", opt_time,
32 (void *)offsetof(smtp_transport_options_block, command_timeout) },
33 { "connect_timeout", opt_time,
34 (void *)offsetof(smtp_transport_options_block, connect_timeout) },
35 { "connection_max_messages", opt_int | opt_public,
36 (void *)offsetof(transport_instance, connection_max_messages) },
37 { "data_timeout", opt_time,
38 (void *)offsetof(smtp_transport_options_block, data_timeout) },
39 { "delay_after_cutoff", opt_bool,
40 (void *)offsetof(smtp_transport_options_block, delay_after_cutoff) },
42 { "dkim_canon", opt_stringptr,
43 (void *)offsetof(smtp_transport_options_block, dkim.dkim_canon) },
44 { "dkim_domain", opt_stringptr,
45 (void *)offsetof(smtp_transport_options_block, dkim.dkim_domain) },
46 { "dkim_hash", opt_stringptr,
47 (void *)offsetof(smtp_transport_options_block, dkim.dkim_hash) },
48 { "dkim_identity", opt_stringptr,
49 (void *)offsetof(smtp_transport_options_block, dkim.dkim_identity) },
50 { "dkim_private_key", opt_stringptr,
51 (void *)offsetof(smtp_transport_options_block, dkim.dkim_private_key) },
52 { "dkim_selector", opt_stringptr,
53 (void *)offsetof(smtp_transport_options_block, dkim.dkim_selector) },
54 { "dkim_sign_headers", opt_stringptr,
55 (void *)offsetof(smtp_transport_options_block, dkim.dkim_sign_headers) },
56 { "dkim_strict", opt_stringptr,
57 (void *)offsetof(smtp_transport_options_block, dkim.dkim_strict) },
59 { "dns_qualify_single", opt_bool,
60 (void *)offsetof(smtp_transport_options_block, dns_qualify_single) },
61 { "dns_search_parents", opt_bool,
62 (void *)offsetof(smtp_transport_options_block, dns_search_parents) },
63 { "dnssec_request_domains", opt_stringptr,
64 (void *)offsetof(smtp_transport_options_block, dnssec.request) },
65 { "dnssec_require_domains", opt_stringptr,
66 (void *)offsetof(smtp_transport_options_block, dnssec.require) },
67 { "dscp", opt_stringptr,
68 (void *)offsetof(smtp_transport_options_block, dscp) },
69 { "fallback_hosts", opt_stringptr,
70 (void *)offsetof(smtp_transport_options_block, fallback_hosts) },
71 { "final_timeout", opt_time,
72 (void *)offsetof(smtp_transport_options_block, final_timeout) },
73 { "gethostbyname", opt_bool,
74 (void *)offsetof(smtp_transport_options_block, gethostbyname) },
75 { "helo_data", opt_stringptr,
76 (void *)offsetof(smtp_transport_options_block, helo_data) },
77 { "hosts", opt_stringptr,
78 (void *)offsetof(smtp_transport_options_block, hosts) },
79 { "hosts_avoid_esmtp", opt_stringptr,
80 (void *)offsetof(smtp_transport_options_block, hosts_avoid_esmtp) },
81 { "hosts_avoid_pipelining", opt_stringptr,
82 (void *)offsetof(smtp_transport_options_block, hosts_avoid_pipelining) },
84 { "hosts_avoid_tls", opt_stringptr,
85 (void *)offsetof(smtp_transport_options_block, hosts_avoid_tls) },
87 { "hosts_max_try", opt_int,
88 (void *)offsetof(smtp_transport_options_block, hosts_max_try) },
89 { "hosts_max_try_hardlimit", opt_int,
90 (void *)offsetof(smtp_transport_options_block, hosts_max_try_hardlimit) },
92 { "hosts_nopass_tls", opt_stringptr,
93 (void *)offsetof(smtp_transport_options_block, hosts_nopass_tls) },
94 { "hosts_noproxy_tls", opt_stringptr,
95 (void *)offsetof(smtp_transport_options_block, hosts_noproxy_tls) },
97 { "hosts_override", opt_bool,
98 (void *)offsetof(smtp_transport_options_block, hosts_override) },
99 { "hosts_randomize", opt_bool,
100 (void *)offsetof(smtp_transport_options_block, hosts_randomize) },
101 #if defined(SUPPORT_TLS) && !defined(DISABLE_OCSP)
102 { "hosts_request_ocsp", opt_stringptr,
103 (void *)offsetof(smtp_transport_options_block, hosts_request_ocsp) },
105 { "hosts_require_auth", opt_stringptr,
106 (void *)offsetof(smtp_transport_options_block, hosts_require_auth) },
108 # ifdef EXPERIMENTAL_DANE
109 { "hosts_require_dane", opt_stringptr,
110 (void *)offsetof(smtp_transport_options_block, hosts_require_dane) },
112 # ifndef DISABLE_OCSP
113 { "hosts_require_ocsp", opt_stringptr,
114 (void *)offsetof(smtp_transport_options_block, hosts_require_ocsp) },
116 { "hosts_require_tls", opt_stringptr,
117 (void *)offsetof(smtp_transport_options_block, hosts_require_tls) },
119 { "hosts_try_auth", opt_stringptr,
120 (void *)offsetof(smtp_transport_options_block, hosts_try_auth) },
121 { "hosts_try_chunking", opt_stringptr,
122 (void *)offsetof(smtp_transport_options_block, hosts_try_chunking) },
123 #if defined(SUPPORT_TLS) && defined(EXPERIMENTAL_DANE)
124 { "hosts_try_dane", opt_stringptr,
125 (void *)offsetof(smtp_transport_options_block, hosts_try_dane) },
127 { "hosts_try_fastopen", opt_stringptr,
128 (void *)offsetof(smtp_transport_options_block, hosts_try_fastopen) },
130 { "hosts_try_prdr", opt_stringptr,
131 (void *)offsetof(smtp_transport_options_block, hosts_try_prdr) },
134 { "hosts_verify_avoid_tls", opt_stringptr,
135 (void *)offsetof(smtp_transport_options_block, hosts_verify_avoid_tls) },
137 { "interface", opt_stringptr,
138 (void *)offsetof(smtp_transport_options_block, interface) },
139 { "keepalive", opt_bool,
140 (void *)offsetof(smtp_transport_options_block, keepalive) },
141 { "lmtp_ignore_quota", opt_bool,
142 (void *)offsetof(smtp_transport_options_block, lmtp_ignore_quota) },
143 { "max_rcpt", opt_int | opt_public,
144 (void *)offsetof(transport_instance, max_addresses) },
145 { "multi_domain", opt_expand_bool | opt_public,
146 (void *)offsetof(transport_instance, multi_domain) },
147 { "port", opt_stringptr,
148 (void *)offsetof(smtp_transport_options_block, port) },
149 { "protocol", opt_stringptr,
150 (void *)offsetof(smtp_transport_options_block, protocol) },
151 { "retry_include_ip_address", opt_expand_bool,
152 (void *)offsetof(smtp_transport_options_block, retry_include_ip_address) },
153 { "serialize_hosts", opt_stringptr,
154 (void *)offsetof(smtp_transport_options_block, serialize_hosts) },
155 { "size_addition", opt_int,
156 (void *)offsetof(smtp_transport_options_block, size_addition) }
158 ,{ "socks_proxy", opt_stringptr,
159 (void *)offsetof(smtp_transport_options_block, socks_proxy) }
162 ,{ "tls_certificate", opt_stringptr,
163 (void *)offsetof(smtp_transport_options_block, tls_certificate) },
164 { "tls_crl", opt_stringptr,
165 (void *)offsetof(smtp_transport_options_block, tls_crl) },
166 { "tls_dh_min_bits", opt_int,
167 (void *)offsetof(smtp_transport_options_block, tls_dh_min_bits) },
168 { "tls_privatekey", opt_stringptr,
169 (void *)offsetof(smtp_transport_options_block, tls_privatekey) },
170 { "tls_require_ciphers", opt_stringptr,
171 (void *)offsetof(smtp_transport_options_block, tls_require_ciphers) },
172 { "tls_sni", opt_stringptr,
173 (void *)offsetof(smtp_transport_options_block, tls_sni) },
174 { "tls_tempfail_tryclear", opt_bool,
175 (void *)offsetof(smtp_transport_options_block, tls_tempfail_tryclear) },
176 { "tls_try_verify_hosts", opt_stringptr,
177 (void *)offsetof(smtp_transport_options_block, tls_try_verify_hosts) },
178 { "tls_verify_cert_hostnames", opt_stringptr,
179 (void *)offsetof(smtp_transport_options_block,tls_verify_cert_hostnames)},
180 { "tls_verify_certificates", opt_stringptr,
181 (void *)offsetof(smtp_transport_options_block, tls_verify_certificates) },
182 { "tls_verify_hosts", opt_stringptr,
183 (void *)offsetof(smtp_transport_options_block, tls_verify_hosts) }
187 /* Size of the options list. An extern variable has to be used so that its
188 address can appear in the tables drtables.c. */
190 int smtp_transport_options_count =
191 sizeof(smtp_transport_options)/sizeof(optionlist);
197 smtp_transport_options_block smtp_transport_option_defaults = {0};
198 void smtp_transport_init(transport_instance *tblock) {}
199 BOOL smtp_transport_entry(transport_instance *tblock, address_item *addr) {return FALSE;}
200 void smtp_transport_closedown(transport_instance *tblock) {}
202 #else /*!MACRO_PREDEF*/
205 /* Default private options block for the smtp transport. */
207 smtp_transport_options_block smtp_transport_option_defaults = {
211 .fallback_hostlist = NULL,
212 .authenticated_sender = NULL,
213 .helo_data = US"$primary_hostname",
216 .protocol = US"smtp",
218 .serialize_hosts = NULL,
219 .hosts_try_auth = NULL,
220 .hosts_require_auth = NULL,
221 .hosts_try_chunking = US"*",
222 #ifdef EXPERIMENTAL_DANE
223 .hosts_try_dane = NULL,
224 .hosts_require_dane = NULL,
226 .hosts_try_fastopen = NULL,
228 .hosts_try_prdr = US"*",
231 .hosts_request_ocsp = US"*", /* hosts_request_ocsp (except under DANE; tls_client_start()) */
232 .hosts_require_ocsp = NULL,
234 .hosts_require_tls = NULL,
235 .hosts_avoid_tls = NULL,
236 .hosts_verify_avoid_tls = NULL,
237 .hosts_avoid_pipelining = NULL,
238 .hosts_avoid_esmtp = NULL,
240 .hosts_nopass_tls = NULL,
241 .hosts_noproxy_tls = US"*",
243 .command_timeout = 5*60,
244 .connect_timeout = 5*60,
245 .data_timeout = 5*60,
246 .final_timeout = 10*60,
247 .size_addition = 1024,
249 .hosts_max_try_hardlimit = 50,
250 .address_retry_include_sender = TRUE,
251 .allow_localhost = FALSE,
252 .authenticated_sender_force = FALSE,
253 .gethostbyname = FALSE,
254 .dns_qualify_single = TRUE,
255 .dns_search_parents = FALSE,
256 .dnssec = { .request=NULL, .require=NULL },
257 .delay_after_cutoff = TRUE,
258 .hosts_override = FALSE,
259 .hosts_randomize = FALSE,
261 .lmtp_ignore_quota = FALSE,
262 .expand_retry_include_ip_address = NULL,
263 .retry_include_ip_address = TRUE,
268 .tls_certificate = NULL,
270 .tls_privatekey = NULL,
271 .tls_require_ciphers = NULL,
273 .tls_verify_certificates = US"system",
274 .tls_dh_min_bits = EXIM_CLIENT_DH_DEFAULT_MIN_BITS,
275 .tls_tempfail_tryclear = TRUE,
276 .tls_verify_hosts = NULL,
277 .tls_try_verify_hosts = US"*",
278 .tls_verify_cert_hostnames = US"*",
282 {.dkim_domain = NULL,
283 .dkim_identity = NULL,
284 .dkim_private_key = NULL,
285 .dkim_selector = NULL,
287 .dkim_sign_headers = NULL,
289 .dkim_hash = US"sha256",
290 .dot_stuffed = FALSE},
294 /* some DSN flags for use later */
296 static int rf_list[] = {rf_notify_never, rf_notify_success,
297 rf_notify_failure, rf_notify_delay };
299 static uschar *rf_names[] = { US"NEVER", US"SUCCESS", US"FAILURE", US"DELAY" };
305 static uschar *smtp_command; /* Points to last cmd for error messages */
306 static uschar *mail_command; /* Points to MAIL cmd for error messages */
307 static uschar *data_command = US""; /* Points to DATA cmd for error messages */
308 static BOOL update_waiting; /* TRUE to update the "wait" database */
310 /*XXX move to smtp_context */
311 static BOOL pipelining_active; /* current transaction is in pipe mode */
314 /*************************************************
315 * Setup entry point *
316 *************************************************/
318 /* This function is called when the transport is about to be used,
319 but before running it in a sub-process. It is used for two things:
321 (1) To set the fallback host list in addresses, when delivering.
322 (2) To pass back the interface, port, protocol, and other options, for use
323 during callout verification.
326 tblock pointer to the transport instance block
327 addrlist list of addresses about to be transported
328 tf if not NULL, pointer to block in which to return options
329 uid the uid that will be set (not used)
330 gid the gid that will be set (not used)
331 errmsg place for error message (not used)
333 Returns: OK always (FAIL, DEFER not used)
337 smtp_transport_setup(transport_instance *tblock, address_item *addrlist,
338 transport_feedback *tf, uid_t uid, gid_t gid, uschar **errmsg)
340 smtp_transport_options_block *ob =
341 (smtp_transport_options_block *)(tblock->options_block);
343 errmsg = errmsg; /* Keep picky compilers happy */
347 /* Pass back options if required. This interface is getting very messy. */
351 tf->interface = ob->interface;
353 tf->protocol = ob->protocol;
354 tf->hosts = ob->hosts;
355 tf->hosts_override = ob->hosts_override;
356 tf->hosts_randomize = ob->hosts_randomize;
357 tf->gethostbyname = ob->gethostbyname;
358 tf->qualify_single = ob->dns_qualify_single;
359 tf->search_parents = ob->dns_search_parents;
360 tf->helo_data = ob->helo_data;
363 /* Set the fallback host list for all the addresses that don't have fallback
364 host lists, provided that the local host wasn't present in the original host
367 if (!testflag(addrlist, af_local_host_removed))
368 for (; addrlist; addrlist = addrlist->next)
369 if (!addrlist->fallback_hosts) addrlist->fallback_hosts = ob->fallback_hostlist;
376 /*************************************************
377 * Initialization entry point *
378 *************************************************/
380 /* Called for each instance, after its options have been read, to
381 enable consistency checks to be done, or anything else that needs
384 Argument: pointer to the transport instance block
389 smtp_transport_init(transport_instance *tblock)
391 smtp_transport_options_block *ob =
392 (smtp_transport_options_block *)(tblock->options_block);
394 /* Retry_use_local_part defaults FALSE if unset */
396 if (tblock->retry_use_local_part == TRUE_UNSET)
397 tblock->retry_use_local_part = FALSE;
399 /* Set the default port according to the protocol */
401 if (ob->port == NULL)
402 ob->port = (strcmpic(ob->protocol, US"lmtp") == 0)? US"lmtp" :
403 (strcmpic(ob->protocol, US"smtps") == 0)? US"smtps" : US"smtp";
405 /* Set up the setup entry point, to be called before subprocesses for this
408 tblock->setup = smtp_transport_setup;
410 /* Complain if any of the timeouts are zero. */
412 if (ob->command_timeout <= 0 || ob->data_timeout <= 0 ||
413 ob->final_timeout <= 0)
414 log_write(0, LOG_PANIC_DIE|LOG_CONFIG,
415 "command, data, or final timeout value is zero for %s transport",
418 /* If hosts_override is set and there are local hosts, set the global
419 flag that stops verify from showing router hosts. */
421 if (ob->hosts_override && ob->hosts != NULL) tblock->overrides_hosts = TRUE;
423 /* If there are any fallback hosts listed, build a chain of host items
424 for them, but do not do any lookups at this time. */
426 host_build_hostlist(&(ob->fallback_hostlist), ob->fallback_hosts, FALSE);
433 /*************************************************
434 * Set delivery info into all active addresses *
435 *************************************************/
437 /* Only addresses whose status is >= PENDING are relevant. A lesser
438 status means that an address is not currently being processed.
441 addrlist points to a chain of addresses
442 errno_value to put in each address's errno field
443 msg to put in each address's message field
444 rc to put in each address's transport_return field
445 pass_message if TRUE, set the "pass message" flag in the address
446 host if set, mark addrs as having used this host
447 smtp_greeting from peer
448 helo_response from peer
450 If errno_value has the special value ERRNO_CONNECTTIMEOUT, ETIMEDOUT is put in
451 the errno field, and RTEF_CTOUT is ORed into the more_errno field, to indicate
452 this particular type of timeout.
458 set_errno(address_item *addrlist, int errno_value, uschar *msg, int rc,
459 BOOL pass_message, host_item * host
460 #ifdef EXPERIMENTAL_DSN_INFO
461 , const uschar * smtp_greeting, const uschar * helo_response
467 if (errno_value == ERRNO_CONNECTTIMEOUT)
469 errno_value = ETIMEDOUT;
470 orvalue = RTEF_CTOUT;
472 for (addr = addrlist; addr; addr = addr->next)
473 if (addr->transport_return >= PENDING)
475 addr->basic_errno = errno_value;
476 addr->more_errno |= orvalue;
480 if (pass_message) setflag(addr, af_pass_message);
482 addr->transport_return = rc;
485 addr->host_used = host;
486 #ifdef EXPERIMENTAL_DSN_INFO
488 {uschar * s = Ustrchr(smtp_greeting, '\n'); if (s) *s = '\0';}
489 addr->smtp_greeting = smtp_greeting;
492 {uschar * s = Ustrchr(helo_response, '\n'); if (s) *s = '\0';}
493 addr->helo_response = helo_response;
500 set_errno_nohost(address_item *addrlist, int errno_value, uschar *msg, int rc,
503 set_errno(addrlist, errno_value, msg, rc, pass_message, NULL
504 #ifdef EXPERIMENTAL_DSN_INFO
511 /*************************************************
512 * Check an SMTP response *
513 *************************************************/
515 /* This function is given an errno code and the SMTP response buffer
516 to analyse, together with the host identification for generating messages. It
517 sets an appropriate message and puts the first digit of the response code into
518 the yield variable. If no response was actually read, a suitable digit is
522 host the current host, to get its name for messages
523 errno_value pointer to the errno value
524 more_errno from the top address for use with ERRNO_FILTER_FAIL
525 buffer the SMTP response buffer
526 yield where to put a one-digit SMTP response code
527 message where to put an error message
528 pass_message set TRUE if message is an SMTP response
530 Returns: TRUE if an SMTP "QUIT" command should be sent, else FALSE
534 check_response(host_item *host, int *errno_value, int more_errno,
535 uschar *buffer, int *yield, uschar **message, BOOL *pass_message)
537 uschar * pl = pipelining_active ? US"pipelined " : US"";
540 *yield = '4'; /* Default setting is to give a temporary error */
544 case ETIMEDOUT: /* Handle response timeout */
545 *message = US string_sprintf("SMTP timeout after %s%s",
547 if (transport_count > 0)
548 *message = US string_sprintf("%s (%d bytes written)", *message,
552 case ERRNO_SMTPFORMAT: /* Handle malformed SMTP response */
553 s = string_printing(buffer);
554 while (isspace(*s)) s++;
556 ? string_sprintf("Malformed SMTP reply (an empty line) "
557 "in response to %s%s", pl, smtp_command)
558 : string_sprintf("Malformed SMTP reply in response to %s%s: %s",
559 pl, smtp_command, s);
562 case ERRNO_FILTER_FAIL: /* Handle a failed filter process error;
563 can't send QUIT as we mustn't end the DATA. */
564 *message = string_sprintf("transport filter process failed (%d)%s",
566 more_errno == EX_EXECFAILED ? ": unable to execute command" : "");
569 case ERRNO_CHHEADER_FAIL: /* Handle a failed add_headers expansion;
570 can't send QUIT as we mustn't end the DATA. */
572 string_sprintf("failed to expand headers_add or headers_remove: %s",
573 expand_string_message);
576 case ERRNO_WRITEINCOMPLETE: /* failure to write a complete data block */
577 *message = string_sprintf("failed to write a data block");
581 case ERRNO_UTF8_FWD: /* no advertised SMTPUTF8, for international message */
582 *message = US"utf8 support required but not offered for forwarding";
583 DEBUG(D_deliver|D_transport) debug_printf("%s\n", *message);
588 /* Handle error responses from the remote mailer. */
592 *message = string_sprintf("SMTP error from remote mail server after %s%s: "
593 "%s", pl, smtp_command, s = string_printing(buffer));
594 *pass_message = TRUE;
599 /* No data was read. If there is no errno, this must be the EOF (i.e.
600 connection closed) case, which causes deferral. An explicit connection reset
601 error has the same effect. Otherwise, put the host's identity in the message,
602 leaving the errno value to be interpreted as well. In all cases, we have to
603 assume the connection is now dead. */
605 if (*errno_value == 0 || *errno_value == ECONNRESET)
607 *errno_value = ERRNO_SMTPCLOSED;
608 *message = US string_sprintf("Remote host closed connection "
609 "in response to %s%s", pl, smtp_command);
612 *message = US string_sprintf("%s [%s]", host->name, host->address);
619 /*************************************************
620 * Write error message to logs *
621 *************************************************/
623 /* This writes to the main log and to the message log.
626 addr the address item containing error information
627 host the current host
633 write_logs(address_item *addr, host_item *host)
635 uschar * message = LOGGING(outgoing_port)
636 ? string_sprintf("H=%s [%s]:%d", host->name, host->address,
637 host->port == PORT_NONE ? 25 : host->port)
638 : string_sprintf("H=%s [%s]", host->name, host->address);
642 message = string_sprintf("%s: %s", message, addr->message);
643 if (addr->basic_errno > 0)
644 message = string_sprintf("%s: %s", message, strerror(addr->basic_errno));
645 log_write(0, LOG_MAIN, "%s", message);
646 deliver_msglog("%s %s\n", tod_stamp(tod_log), message);
650 const uschar * s = exim_errstr(addr->basic_errno);
651 log_write(0, LOG_MAIN, "%s %s", message, s);
652 deliver_msglog("%s %s %s\n", tod_stamp(tod_log), message, s);
657 msglog_line(host_item * host, uschar * message)
659 deliver_msglog("%s H=%s [%s] %s\n", tod_stamp(tod_log),
660 host->name, host->address, message);
665 #ifndef DISABLE_EVENT
666 /*************************************************
667 * Post-defer action *
668 *************************************************/
670 /* This expands an arbitrary per-transport string.
671 It might, for example, be used to write to the database log.
674 addr the address item containing error information
675 host the current host
681 deferred_event_raise(address_item *addr, host_item *host)
683 uschar * action = addr->transport->event_action;
684 const uschar * save_domain;
690 save_domain = deliver_domain;
691 save_local = deliver_localpart;
693 /*XXX would ip & port already be set up? */
694 deliver_host_address = string_copy(host->address);
695 deliver_host_port = host->port == PORT_NONE ? 25 : host->port;
696 event_defer_errno = addr->basic_errno;
698 router_name = addr->router->name;
699 transport_name = addr->transport->name;
700 deliver_domain = addr->domain;
701 deliver_localpart = addr->local_part;
703 (void) event_raise(action, US"msg:host:defer",
705 ? addr->basic_errno > 0
706 ? string_sprintf("%s: %s", addr->message, strerror(addr->basic_errno))
707 : string_copy(addr->message)
708 : addr->basic_errno > 0
709 ? string_copy(US strerror(addr->basic_errno))
712 deliver_localpart = save_local;
713 deliver_domain = save_domain;
714 router_name = transport_name = NULL;
718 /*************************************************
719 * Synchronize SMTP responses *
720 *************************************************/
722 /* This function is called from smtp_deliver() to receive SMTP responses from
723 the server, and match them up with the commands to which they relate. When
724 PIPELINING is not in use, this function is called after every command, and is
725 therefore somewhat over-engineered, but it is simpler to use a single scheme
726 that works both with and without PIPELINING instead of having two separate sets
729 The set of commands that are buffered up with pipelining may start with MAIL
730 and may end with DATA; in between are RCPT commands that correspond to the
731 addresses whose status is PENDING_DEFER. All other commands (STARTTLS, AUTH,
732 etc.) are never buffered.
734 Errors after MAIL or DATA abort the whole process leaving the response in the
735 buffer. After MAIL, pending responses are flushed, and the original command is
736 re-instated in big_buffer for error messages. For RCPT commands, the remote is
737 permitted to reject some recipient addresses while accepting others. However
738 certain errors clearly abort the whole process. Set the value in
739 transport_return to PENDING_OK if the address is accepted. If there is a
740 subsequent general error, it will get reset accordingly. If not, it will get
741 converted to OK at the end.
744 sx smtp connection context
745 count the number of responses to read
746 pending_DATA 0 if last command sent was not DATA
747 +1 if previously had a good recipient
748 -1 if not previously had a good recipient
750 Returns: 3 if at least one address had 2xx and one had 5xx
751 2 if at least one address had 5xx but none had 2xx
752 1 if at least one host had a 2xx response, but none had 5xx
753 0 no address had 2xx or 5xx but no errors (all 4xx, or just DATA)
754 -1 timeout while reading RCPT response
755 -2 I/O or other non-response error for RCPT
756 -3 DATA or MAIL failed - errno and buffer set
760 sync_responses(smtp_context * sx, int count, int pending_DATA)
762 address_item *addr = sx->sync_addr;
763 smtp_transport_options_block *ob =
764 (smtp_transport_options_block *)sx->tblock->options_block;
767 /* Handle the response for a MAIL command. On error, reinstate the original
768 command in big_buffer for error message use, and flush any further pending
769 responses before returning, except after I/O errors and timeouts. */
771 if (sx->pending_MAIL)
774 if (!smtp_read_response(&sx->inblock, sx->buffer, sizeof(sx->buffer),
775 '2', ob->command_timeout))
777 DEBUG(D_transport) debug_printf("bad response for MAIL\n");
778 Ustrcpy(big_buffer, mail_command); /* Fits, because it came from there! */
779 if (errno == 0 && sx->buffer[0] != 0)
781 uschar flushbuffer[4096];
783 if (sx->buffer[0] == '4')
785 save_errno = ERRNO_MAIL4XX;
786 addr->more_errno |= ((sx->buffer[1] - '0')*10 + sx->buffer[2] - '0') << 8;
790 if (!smtp_read_response(&sx->inblock, flushbuffer, sizeof(flushbuffer),
791 '2', ob->command_timeout)
792 && (errno != 0 || flushbuffer[0] == 0))
798 if (pending_DATA) count--; /* Number of RCPT responses to come */
799 while (count-- > 0) /* Mark any pending addrs with the host used */
801 while (addr->transport_return != PENDING_DEFER) addr = addr->next;
802 addr->host_used = sx->host;
809 if (pending_DATA) count--; /* Number of RCPT responses to come */
811 /* Read and handle the required number of RCPT responses, matching each one up
812 with an address by scanning for the next address whose status is PENDING_DEFER.
817 while (addr->transport_return != PENDING_DEFER)
818 if (!(addr = addr->next))
821 /* The address was accepted */
822 addr->host_used = sx->host;
824 if (smtp_read_response(&sx->inblock, sx->buffer, sizeof(sx->buffer),
825 '2', ob->command_timeout))
828 addr->transport_return = PENDING_OK;
830 /* If af_dr_retry_exists is set, there was a routing delay on this address;
831 ensure that any address-specific retry record is expunged. We do this both
832 for the basic key and for the version that also includes the sender. */
834 if (testflag(addr, af_dr_retry_exists))
836 uschar *altkey = string_sprintf("%s:<%s>", addr->address_retry_key,
838 retry_add_item(addr, altkey, rf_delete);
839 retry_add_item(addr, addr->address_retry_key, rf_delete);
843 /* Timeout while reading the response */
845 else if (errno == ETIMEDOUT)
847 uschar *message = string_sprintf("SMTP timeout after RCPT TO:<%s>",
848 transport_rcpt_address(addr, sx->tblock->rcpt_include_affixes));
849 set_errno_nohost(sx->first_addr, ETIMEDOUT, message, DEFER, FALSE);
850 retry_add_item(addr, addr->address_retry_key, 0);
851 update_waiting = FALSE;
855 /* Handle other errors in obtaining an SMTP response by returning -1. This
856 will cause all the addresses to be deferred. Restore the SMTP command in
857 big_buffer for which we are checking the response, so the error message
860 else if (errno != 0 || sx->buffer[0] == 0)
862 string_format(big_buffer, big_buffer_size, "RCPT TO:<%s>",
863 transport_rcpt_address(addr, sx->tblock->rcpt_include_affixes));
867 /* Handle SMTP permanent and temporary response codes. */
872 string_sprintf("SMTP error from remote mail server after RCPT TO:<%s>: "
873 "%s", transport_rcpt_address(addr, sx->tblock->rcpt_include_affixes),
874 string_printing(sx->buffer));
875 setflag(addr, af_pass_message);
877 msglog_line(sx->host, addr->message);
879 /* The response was 5xx */
881 if (sx->buffer[0] == '5')
883 addr->transport_return = FAIL;
887 /* The response was 4xx */
891 addr->transport_return = DEFER;
892 addr->basic_errno = ERRNO_RCPT4XX;
893 addr->more_errno |= ((sx->buffer[1] - '0')*10 + sx->buffer[2] - '0') << 8;
897 #ifndef DISABLE_EVENT
898 event_defer_errno = addr->more_errno;
899 msg_event_raise(US"msg:rcpt:host:defer", addr);
902 /* Log temporary errors if there are more hosts to be tried.
903 If not, log this last one in the == line. */
906 log_write(0, LOG_MAIN, "H=%s [%s]: %s",
907 sx->host->name, sx->host->address, addr->message);
909 #ifndef DISABLE_EVENT
911 msg_event_raise(US"msg:rcpt:defer", addr);
914 /* Do not put this message on the list of those waiting for specific
915 hosts, as otherwise it is likely to be tried too often. */
917 update_waiting = FALSE;
919 /* Add a retry item for the address so that it doesn't get tried again
920 too soon. If address_retry_include_sender is true, add the sender address
924 ob->address_retry_include_sender
925 ? string_sprintf("%s:<%s>", addr->address_retry_key, sender_address)
926 : addr->address_retry_key,
931 } /* Loop for next RCPT response */
933 /* Update where to start at for the next block of responses, unless we
934 have already handled all the addresses. */
936 if (addr) sx->sync_addr = addr->next;
938 /* Handle a response to DATA. If we have not had any good recipients, either
939 previously or in this block, the response is ignored. */
941 if (pending_DATA != 0 &&
942 !smtp_read_response(&sx->inblock, sx->buffer, sizeof(sx->buffer),
943 '3', ob->command_timeout))
948 if (pending_DATA > 0 || (yield & 1) != 0)
950 if (errno == 0 && sx->buffer[0] == '4')
952 errno = ERRNO_DATA4XX;
953 sx->first_addr->more_errno |= ((sx->buffer[1] - '0')*10 + sx->buffer[2] - '0') << 8;
957 (void)check_response(sx->host, &errno, 0, sx->buffer, &code, &msg, &pass_message);
958 DEBUG(D_transport) debug_printf("%s\nerror for DATA ignored: pipelining "
959 "is in use and there were no good recipients\n", msg);
962 /* All responses read and handled; MAIL (if present) received 2xx and DATA (if
963 present) received 3xx. If any RCPTs were handled and yielded anything other
964 than 4xx, yield will be set non-zero. */
971 /* Do the client side of smtp-level authentication */
974 buffer EHLO response from server (gets overwritten)
975 addrlist chain of potential addresses to deliver
976 host host to deliver to
978 ibp, obp comms channel control blocks
981 OK Success, or failed (but not required): global "smtp_authenticated" set
982 DEFER Failed authentication (and was required)
983 ERROR Internal problem
985 FAIL_SEND Failed communications - transmit
990 smtp_auth(uschar *buffer, unsigned bufsize, address_item *addrlist, host_item *host,
991 smtp_transport_options_block *ob, BOOL is_esmtp,
992 smtp_inblock *ibp, smtp_outblock *obp)
995 uschar *fail_reason = US"server did not advertise AUTH support";
997 smtp_authenticated = FALSE;
998 client_authenticator = client_authenticated_id = client_authenticated_sender = NULL;
999 require_auth = verify_check_given_host(&ob->hosts_require_auth, host);
1001 if (is_esmtp && !regex_AUTH) regex_AUTH =
1002 regex_must_compile(US"\\n250[\\s\\-]AUTH\\s+([\\-\\w\\s]+)(?:\\n|$)",
1005 if (is_esmtp && regex_match_and_setup(regex_AUTH, buffer, 0, -1))
1007 uschar *names = string_copyn(expand_nstring[1], expand_nlength[1]);
1008 expand_nmax = -1; /* reset */
1010 /* Must not do this check until after we have saved the result of the
1011 regex match above. */
1013 if (require_auth == OK ||
1014 verify_check_given_host(&ob->hosts_try_auth, host) == OK)
1017 fail_reason = US"no common mechanisms were found";
1019 DEBUG(D_transport) debug_printf("scanning authentication mechanisms\n");
1021 /* Scan the configured authenticators looking for one which is configured
1022 for use as a client, which is not suppressed by client_condition, and
1023 whose name matches an authentication mechanism supported by the server.
1024 If one is found, attempt to authenticate by calling its client function.
1027 for (au = auths; !smtp_authenticated && au; au = au->next)
1031 (au->client_condition != NULL &&
1032 !expand_check_condition(au->client_condition, au->name,
1033 US"client authenticator")))
1035 DEBUG(D_transport) debug_printf("skipping %s authenticator: %s\n",
1037 (au->client)? "client_condition is false" :
1038 "not configured as a client");
1042 /* Loop to scan supported server mechanisms */
1047 int len = Ustrlen(au->public_name);
1048 while (isspace(*p)) p++;
1050 if (strncmpic(au->public_name, p, len) != 0 ||
1051 (p[len] != 0 && !isspace(p[len])))
1053 while (*p != 0 && !isspace(*p)) p++;
1057 /* Found data for a listed mechanism. Call its client entry. Set
1058 a flag in the outblock so that data is overwritten after sending so
1059 that reflections don't show it. */
1061 fail_reason = US"authentication attempt(s) failed";
1062 obp->authenticating = TRUE;
1063 rc = (au->info->clientcode)(au, ibp, obp,
1064 ob->command_timeout, buffer, bufsize);
1065 obp->authenticating = FALSE;
1066 DEBUG(D_transport) debug_printf("%s authenticator yielded %d\n",
1069 /* A temporary authentication failure must hold up delivery to
1070 this host. After a permanent authentication failure, we carry on
1071 to try other authentication methods. If all fail hard, try to
1072 deliver the message unauthenticated unless require_auth was set. */
1077 smtp_authenticated = TRUE; /* stops the outer loop */
1078 client_authenticator = au->name;
1079 if (au->set_client_id != NULL)
1080 client_authenticated_id = expand_string(au->set_client_id);
1083 /* Failure after writing a command */
1088 /* Failure after reading a response */
1091 if (errno != 0 || buffer[0] != '5') return FAIL;
1092 log_write(0, LOG_MAIN, "%s authenticator failed H=%s [%s] %s",
1093 au->name, host->name, host->address, buffer);
1096 /* Failure by some other means. In effect, the authenticator
1097 decided it wasn't prepared to handle this case. Typically this
1098 is the result of "fail" in an expansion string. Do we need to
1099 log anything here? Feb 2006: a message is now put in the buffer
1100 if logging is required. */
1104 log_write(0, LOG_MAIN, "%s authenticator cancelled "
1105 "authentication H=%s [%s] %s", au->name, host->name,
1106 host->address, buffer);
1109 /* Internal problem, message in buffer. */
1112 set_errno_nohost(addrlist, ERRNO_AUTHPROB, string_copy(buffer),
1117 break; /* If not authenticated, try next authenticator */
1118 } /* Loop for scanning supported server mechanisms */
1119 } /* Loop for further authenticators */
1123 /* If we haven't authenticated, but are required to, give up. */
1125 if (require_auth == OK && !smtp_authenticated)
1127 set_errno_nohost(addrlist, ERRNO_AUTHFAIL,
1128 string_sprintf("authentication required but %s", fail_reason), DEFER,
1137 /* Construct AUTH appendix string for MAIL TO */
1140 buffer to build string
1141 addrlist chain of potential addresses to deliver
1142 ob transport options
1144 Globals smtp_authenticated
1145 client_authenticated_sender
1146 Return True on error, otherwise buffer has (possibly empty) terminated string
1150 smtp_mail_auth_str(uschar *buffer, unsigned bufsize, address_item *addrlist,
1151 smtp_transport_options_block *ob)
1153 uschar *local_authenticated_sender = authenticated_sender;
1156 debug_printf("smtp_mail_auth_str: as<%s> os<%s> SA<%s>\n", authenticated_sender, ob->authenticated_sender, smtp_authenticated?"Y":"N");
1159 if (ob->authenticated_sender != NULL)
1161 uschar *new = expand_string(ob->authenticated_sender);
1164 if (!expand_string_forcedfail)
1166 uschar *message = string_sprintf("failed to expand "
1167 "authenticated_sender: %s", expand_string_message);
1168 set_errno_nohost(addrlist, ERRNO_EXPANDFAIL, message, DEFER, FALSE);
1172 else if (new[0] != 0) local_authenticated_sender = new;
1175 /* Add the authenticated sender address if present */
1177 if ((smtp_authenticated || ob->authenticated_sender_force) &&
1178 local_authenticated_sender != NULL)
1180 string_format(buffer, bufsize, " AUTH=%s",
1181 auth_xtextencode(local_authenticated_sender,
1182 Ustrlen(local_authenticated_sender)));
1183 client_authenticated_sender = string_copy(local_authenticated_sender);
1193 #ifdef EXPERIMENTAL_DANE
1194 /* Lookup TLSA record for host/port.
1195 Return: OK success with dnssec; DANE mode
1196 DEFER Do not use this host now, may retry later
1197 FAIL_FORCED No TLSA record; DANE not usable
1198 FAIL Do not use this connection
1202 tlsa_lookup(const host_item * host, dns_answer * dnsa, BOOL dane_required)
1204 /* move this out to host.c given the similarity to dns_lookup() ? */
1206 const uschar * fullname = buffer;
1210 /* TLSA lookup string */
1211 (void)sprintf(CS buffer, "_%d._tcp.%.256s", host->port, host->name);
1213 rc = dns_lookup(dnsa, buffer, T_TLSA, &fullname);
1214 sec = dns_is_secure(dnsa);
1216 debug_printf("TLSA lookup ret %d %sDNSSEC\n", rc, sec ? "" : "not ");
1223 log_write(0, LOG_MAIN, "DANE error: TLSA lookup not DNSSEC");
1226 return DEFER; /* just defer this TLS'd conn */
1228 case DNS_NODATA: /* no TLSA RR for this lookup */
1229 case DNS_NOMATCH: /* no records at all for this lookup */
1230 return dane_required ? FAIL : FAIL_FORCED;
1234 return dane_required ? FAIL : DEFER;
1241 typedef struct smtp_compare_s
1243 uschar *current_sender_address;
1244 struct transport_instance *tblock;
1248 /* Create a unique string that identifies this message, it is based on
1249 sender_address, helo_data and tls_certificate if enabled.
1253 smtp_local_identity(uschar * sender, struct transport_instance * tblock)
1255 address_item * addr1;
1256 uschar * if1 = US"";
1257 uschar * helo1 = US"";
1259 uschar * tlsc1 = US"";
1261 uschar * save_sender_address = sender_address;
1262 uschar * local_identity = NULL;
1263 smtp_transport_options_block * ob =
1264 (smtp_transport_options_block *)tblock->options_block;
1266 sender_address = sender;
1268 addr1 = deliver_make_addr (sender, TRUE);
1269 deliver_set_expansions(addr1);
1272 if1 = expand_string(ob->interface);
1275 helo1 = expand_string(ob->helo_data);
1278 if (ob->tls_certificate)
1279 tlsc1 = expand_string(ob->tls_certificate);
1280 local_identity = string_sprintf ("%s^%s^%s", if1, helo1, tlsc1);
1282 local_identity = string_sprintf ("%s^%s", if1, helo1);
1285 deliver_set_expansions(NULL);
1286 sender_address = save_sender_address;
1288 return local_identity;
1293 /* This routine is a callback that is called from transport_check_waiting.
1294 This function will evaluate the incoming message versus the previous
1295 message. If the incoming message is using a different local identity then
1296 we will veto this new message. */
1299 smtp_are_same_identities(uschar * message_id, smtp_compare_t * s_compare)
1301 uschar * message_local_identity,
1302 * current_local_identity,
1303 * new_sender_address;
1305 current_local_identity =
1306 smtp_local_identity(s_compare->current_sender_address, s_compare->tblock);
1308 if (!(new_sender_address = deliver_get_sender_address(message_id)))
1311 message_local_identity =
1312 smtp_local_identity(new_sender_address, s_compare->tblock);
1314 return Ustrcmp(current_local_identity, message_local_identity) == 0;
1320 ehlo_response(uschar * buf, uschar checks)
1322 size_t bsize = Ustrlen(buf);
1325 if ( checks & OPTION_TLS
1326 && pcre_exec(regex_STARTTLS, NULL, CS buf, bsize, 0, PCRE_EOPT, NULL, 0) < 0)
1327 checks &= ~OPTION_TLS;
1330 if ( checks & OPTION_IGNQ
1331 && pcre_exec(regex_IGNOREQUOTA, NULL, CS buf, bsize, 0,
1332 PCRE_EOPT, NULL, 0) < 0)
1333 checks &= ~OPTION_IGNQ;
1335 if ( checks & OPTION_CHUNKING
1336 && pcre_exec(regex_CHUNKING, NULL, CS buf, bsize, 0, PCRE_EOPT, NULL, 0) < 0)
1337 checks &= ~OPTION_CHUNKING;
1339 #ifndef DISABLE_PRDR
1340 if ( checks & OPTION_PRDR
1341 && pcre_exec(regex_PRDR, NULL, CS buf, bsize, 0, PCRE_EOPT, NULL, 0) < 0)
1342 checks &= ~OPTION_PRDR;
1346 if ( checks & OPTION_UTF8
1347 && pcre_exec(regex_UTF8, NULL, CS buf, bsize, 0, PCRE_EOPT, NULL, 0) < 0)
1348 checks &= ~OPTION_UTF8;
1351 if ( checks & OPTION_DSN
1352 && pcre_exec(regex_DSN, NULL, CS buf, bsize, 0, PCRE_EOPT, NULL, 0) < 0)
1353 checks &= ~OPTION_DSN;
1355 if ( checks & OPTION_PIPE
1356 && pcre_exec(regex_PIPELINING, NULL, CS buf, bsize, 0,
1357 PCRE_EOPT, NULL, 0) < 0)
1358 checks &= ~OPTION_PIPE;
1360 if ( checks & OPTION_SIZE
1361 && pcre_exec(regex_SIZE, NULL, CS buf, bsize, 0, PCRE_EOPT, NULL, 0) < 0)
1362 checks &= ~OPTION_SIZE;
1369 /* Callback for emitting a BDAT data chunk header.
1371 If given a nonzero size, first flush any buffered SMTP commands
1372 then emit the command.
1374 Reap previous SMTP command responses if requested, and always reap
1375 the response from a previous BDAT command.
1378 tctx transport context
1379 chunk_size value for SMTP BDAT command
1381 tc_chunk_last add LAST option to SMTP BDAT command
1382 tc_reap_prev reap response to previous SMTP commands
1384 Returns: OK or ERROR
1388 smtp_chunk_cmd_callback(transport_ctx * tctx, unsigned chunk_size,
1391 smtp_transport_options_block * ob =
1392 (smtp_transport_options_block *)(tctx->tblock->options_block);
1393 smtp_context * sx = tctx->smtp_context;
1397 /* Write SMTP chunk header command. If not reaping responses, note that
1398 there may be more writes (like, the chunk data) done soon. */
1402 if((cmd_count = smtp_write_command(&sx->outblock,
1403 flags & tc_reap_prev ? SCMD_FLUSH : SCMD_MORE,
1404 "BDAT %u%s\r\n", chunk_size, flags & tc_chunk_last ? " LAST" : "")
1405 ) < 0) return ERROR;
1406 if (flags & tc_chunk_last)
1407 data_command = string_copy(big_buffer); /* Save for later error message */
1410 prev_cmd_count = cmd_count += sx->cmd_count;
1412 /* Reap responses for any previous, but not one we just emitted */
1416 if (sx->pending_BDAT)
1419 if (flags & tc_reap_prev && prev_cmd_count > 0)
1421 DEBUG(D_transport) debug_printf("look for %d responses"
1422 " for previous pipelined cmds\n", prev_cmd_count);
1424 switch(sync_responses(sx, prev_cmd_count, 0))
1426 case 1: /* 2xx (only) => OK */
1427 case 3: sx->good_RCPT = TRUE; /* 2xx & 5xx => OK & progress made */
1428 case 2: sx->completed_addr = TRUE; /* 5xx (only) => progress made */
1429 case 0: break; /* No 2xx or 5xx, but no probs */
1431 case -1: /* Timeout on RCPT */
1432 default: return ERROR; /* I/O error, or any MAIL/DATA error */
1435 if (!sx->pending_BDAT)
1436 pipelining_active = FALSE;
1439 /* Reap response for an outstanding BDAT */
1441 if (sx->pending_BDAT)
1443 DEBUG(D_transport) debug_printf("look for one response for BDAT\n");
1445 if (!smtp_read_response(&sx->inblock, sx->buffer, sizeof(sx->buffer), '2',
1446 ob->command_timeout))
1448 if (errno == 0 && sx->buffer[0] == '4')
1450 errno = ERRNO_DATA4XX; /*XXX does this actually get used? */
1451 sx->addrlist->more_errno |=
1452 ((sx->buffer[1] - '0')*10 + sx->buffer[2] - '0') << 8;
1457 sx->pending_BDAT = FALSE;
1458 pipelining_active = FALSE;
1460 else if (chunk_size > 0)
1461 sx->pending_BDAT = TRUE;
1464 sx->cmd_count = cmd_count;
1470 /*************************************************
1471 * Make connection for given message *
1472 *************************************************/
1476 ctx connection context
1477 suppress_tls if TRUE, don't attempt a TLS connection - this is set for
1478 a second attempt after TLS initialization fails
1480 Returns: OK - the connection was made and the delivery attempted;
1481 fd is set in the conn context, tls_out set up.
1482 DEFER - the connection could not be made, or something failed
1483 while setting up the SMTP session, or there was a
1484 non-message-specific error, such as a timeout.
1485 ERROR - helo_data or add_headers or authenticated_sender is
1486 specified for this transport, and the string failed
1490 smtp_setup_conn(smtp_context * sx, BOOL suppress_tls)
1492 #if defined(SUPPORT_TLS) && defined(EXPERIMENTAL_DANE)
1493 dns_answer tlsa_dnsa;
1495 BOOL pass_message = FALSE;
1496 uschar * message = NULL;
1500 sx->ob = (smtp_transport_options_block *) sx->tblock->options_block;
1502 sx->lmtp = strcmpic(sx->ob->protocol, US"lmtp") == 0;
1503 sx->smtps = strcmpic(sx->ob->protocol, US"smtps") == 0;
1505 sx->send_rset = TRUE;
1506 sx->send_quit = TRUE;
1507 sx->setting_up = TRUE;
1509 sx->esmtp_sent = FALSE;
1511 sx->utf8_needed = FALSE;
1513 sx->dsn_all_lasthop = TRUE;
1514 #if defined(SUPPORT_TLS) && defined(EXPERIMENTAL_DANE)
1516 sx->dane_required = verify_check_given_host(&sx->ob->hosts_require_dane, sx->host) == OK;
1519 if ((sx->max_rcpt = sx->tblock->max_addresses) == 0) sx->max_rcpt = 999999;
1520 sx->peer_offered = 0;
1521 sx->avoid_option = 0;
1522 sx->igquotstr = US"";
1523 if (!sx->helo_data) sx->helo_data = sx->ob->helo_data;
1524 #ifdef EXPERIMENTAL_DSN_INFO
1525 sx->smtp_greeting = NULL;
1526 sx->helo_response = NULL;
1529 smtp_command = US"initial connection";
1530 sx->buffer[0] = '\0';
1532 /* Set up the buffer for reading SMTP response packets. */
1534 sx->inblock.buffer = sx->inbuffer;
1535 sx->inblock.buffersize = sizeof(sx->inbuffer);
1536 sx->inblock.ptr = sx->inbuffer;
1537 sx->inblock.ptrend = sx->inbuffer;
1539 /* Set up the buffer for holding SMTP commands while pipelining */
1541 sx->outblock.buffer = sx->outbuffer;
1542 sx->outblock.buffersize = sizeof(sx->outbuffer);
1543 sx->outblock.ptr = sx->outbuffer;
1544 sx->outblock.cmd_count = 0;
1545 sx->outblock.authenticating = FALSE;
1547 /* Reset the parameters of a TLS session. */
1550 tls_out.cipher = NULL; /* the one we may use for this transport */
1551 tls_out.ourcert = NULL;
1552 tls_out.peercert = NULL;
1553 tls_out.peerdn = NULL;
1554 #if defined(SUPPORT_TLS) && !defined(USE_GNUTLS)
1557 tls_out.ocsp = OCSP_NOT_REQ;
1559 /* Flip the legacy TLS-related variables over to the outbound set in case
1560 they're used in the context of the transport. Don't bother resetting
1561 afterward (when being used by a transport) as we're in a subprocess.
1562 For verify, unflipped once the callout is dealt with */
1564 tls_modify_variables(&tls_out);
1569 set_errno_nohost(sx->addrlist, ERRNO_TLSFAILURE, US"TLS support not available",
1575 /* Make a connection to the host if this isn't a continued delivery, and handle
1576 the initial interaction and HELO/EHLO/LHLO. Connect timeout errors are handled
1577 specially so they can be identified for retries. */
1579 if (!continue_hostname)
1582 HDEBUG(D_verify) debug_printf("interface=%s port=%d\n", sx->interface, sx->port);
1584 /* Get the actual port the connection will use, into sx->host */
1586 smtp_port_for_connect(sx->host, sx->port);
1588 #if defined(SUPPORT_TLS) && defined(EXPERIMENTAL_DANE)
1589 /* Do TLSA lookup for DANE */
1591 tls_out.dane_verified = FALSE;
1592 tls_out.tlsa_usage = 0;
1594 if (sx->host->dnssec == DS_YES)
1596 if( sx->dane_required
1597 || verify_check_given_host(&sx->ob->hosts_try_dane, sx->host) == OK
1599 switch (rc = tlsa_lookup(sx->host, &tlsa_dnsa, sx->dane_required))
1601 case OK: sx->dane = TRUE;
1602 sx->ob->tls_tempfail_tryclear = FALSE;
1604 case FAIL_FORCED: break;
1605 default: set_errno_nohost(sx->addrlist, ERRNO_DNSDEFER,
1606 string_sprintf("DANE error: tlsa lookup %s",
1607 rc == DEFER ? "DEFER" : "FAIL"),
1612 else if (sx->dane_required)
1614 set_errno_nohost(sx->addrlist, ERRNO_DNSDEFER,
1615 string_sprintf("DANE error: %s lookup not DNSSEC", sx->host->name),
1622 /* Make the TCP connection */
1624 sx->inblock.sock = sx->outblock.sock =
1625 smtp_connect(sx->host, sx->host_af, sx->interface,
1626 sx->ob->connect_timeout, sx->tblock);
1628 if (sx->inblock.sock < 0)
1630 uschar * msg = NULL;
1633 msg = US strerror(errno);
1634 HDEBUG(D_verify) debug_printf("connect: %s\n", msg);
1636 set_errno_nohost(sx->addrlist,
1637 errno == ETIMEDOUT ? ERRNO_CONNECTTIMEOUT : errno,
1638 sx->verify ? string_sprintf("could not connect: %s", msg)
1641 sx->send_quit = FALSE;
1645 /* Expand the greeting message while waiting for the initial response. (Makes
1646 sense if helo_data contains ${lookup dnsdb ...} stuff). The expansion is
1647 delayed till here so that $sending_interface and $sending_port are set. */
1650 if (!(sx->helo_data = expand_string(sx->helo_data)))
1652 log_write(0, LOG_MAIN|LOG_PANIC,
1653 "<%s>: failed to expand transport's helo_data value for callout: %s",
1654 sx->addrlist->address, expand_string_message);
1659 expand_string_message = NULL;
1660 if ((sx->helo_data = string_domain_utf8_to_alabel(sx->helo_data,
1661 &expand_string_message)),
1662 expand_string_message)
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);
1668 sx->helo_data = NULL;
1672 /* The first thing is to wait for an initial OK response. The dreaded "goto"
1673 is nevertheless a reasonably clean way of programming this kind of logic,
1674 where you want to escape on any error. */
1681 (void) setsockopt(sx->inblock.sock, IPPROTO_TCP, TCP_QUICKACK, US &off, sizeof(off));
1683 good_response = smtp_read_response(&sx->inblock, sx->buffer, sizeof(sx->buffer),
1684 '2', sx->ob->command_timeout);
1685 #ifdef EXPERIMENTAL_DSN_INFO
1686 sx->smtp_greeting = string_copy(sx->buffer);
1688 if (!good_response) goto RESPONSE_FAILED;
1690 #ifndef DISABLE_EVENT
1693 lookup_dnssec_authenticated = sx->host->dnssec==DS_YES ? US"yes"
1694 : sx->host->dnssec==DS_NO ? US"no" : NULL;
1695 s = event_raise(sx->tblock->event_action, US"smtp:connect", sx->buffer);
1698 set_errno_nohost(sx->addrlist, ERRNO_EXPANDFAIL,
1699 string_sprintf("deferred by smtp:connect event expansion: %s", s),
1707 /* Now check if the helo_data expansion went well, and sign off cleanly if
1712 message = string_sprintf("failed to expand helo_data: %s",
1713 expand_string_message);
1714 set_errno_nohost(sx->addrlist, ERRNO_EXPANDFAIL, message, DEFER, FALSE);
1720 /** Debugging without sending a message
1721 sx->addrlist->transport_return = DEFER;
1725 /* Errors that occur after this point follow an SMTP command, which is
1726 left in big_buffer by smtp_write_command() for use in error messages. */
1728 smtp_command = big_buffer;
1730 /* Tell the remote who we are...
1732 February 1998: A convention has evolved that ESMTP-speaking MTAs include the
1733 string "ESMTP" in their greeting lines, so make Exim send EHLO if the
1734 greeting is of this form. The assumption was that the far end supports it
1735 properly... but experience shows that there are some that give 5xx responses,
1736 even though the banner includes "ESMTP" (there's a bloody-minded one that
1737 says "ESMTP not spoken here"). Cope with that case.
1739 September 2000: Time has passed, and it seems reasonable now to always send
1740 EHLO at the start. It is also convenient to make the change while installing
1743 July 2003: Joachim Wieland met a broken server that advertises "PIPELINING"
1744 but times out after sending MAIL FROM, RCPT TO and DATA all together. There
1745 would be no way to send out the mails, so there is now a host list
1746 "hosts_avoid_esmtp" that disables ESMTP for special hosts and solves the
1747 PIPELINING problem as well. Maybe it can also be useful to cure other
1748 problems with broken servers.
1750 Exim originally sent "Helo" at this point and ran for nearly a year that way.
1751 Then somebody tried it with a Microsoft mailer... It seems that all other
1752 mailers use upper case for some reason (the RFC is quite clear about case
1753 independence) so, for peace of mind, I gave in. */
1755 sx->esmtp = verify_check_given_host(&sx->ob->hosts_avoid_esmtp, sx->host) != OK;
1757 /* Alas; be careful, since this goto is not an error-out, so conceivably
1758 we might set data between here and the target which we assume to exist
1759 and be usable. I can see this coming back to bite us. */
1763 smtp_peer_options |= OPTION_TLS;
1764 suppress_tls = FALSE;
1765 sx->ob->tls_tempfail_tryclear = FALSE;
1766 smtp_command = US"SSL-on-connect";
1773 if (smtp_write_command(&sx->outblock, SCMD_FLUSH, "%s %s\r\n",
1774 sx->lmtp ? "LHLO" : "EHLO", sx->helo_data) < 0)
1776 sx->esmtp_sent = TRUE;
1777 if (!smtp_read_response(&sx->inblock, sx->buffer, sizeof(sx->buffer), '2',
1778 sx->ob->command_timeout))
1780 if (errno != 0 || sx->buffer[0] == 0 || sx->lmtp)
1782 #ifdef EXPERIMENTAL_DSN_INFO
1783 sx->helo_response = string_copy(sx->buffer);
1785 goto RESPONSE_FAILED;
1789 #ifdef EXPERIMENTAL_DSN_INFO
1790 sx->helo_response = string_copy(sx->buffer);
1795 debug_printf("not sending EHLO (host matches hosts_avoid_esmtp)\n");
1800 int n = sizeof(sx->buffer);
1801 uschar * rsp = sx->buffer;
1803 if (sx->esmtp_sent && (n = Ustrlen(sx->buffer)) < sizeof(sx->buffer)/2)
1804 { rsp = sx->buffer + n + 1; n = sizeof(sx->buffer) - n; }
1806 if (smtp_write_command(&sx->outblock, SCMD_FLUSH, "HELO %s\r\n", sx->helo_data) < 0)
1808 good_response = smtp_read_response(&sx->inblock, rsp, n,
1809 '2', sx->ob->command_timeout);
1810 #ifdef EXPERIMENTAL_DSN_INFO
1811 sx->helo_response = string_copy(rsp);
1815 /* Handle special logging for a closed connection after HELO
1816 when had previously sent EHLO */
1818 if (rsp != sx->buffer && rsp[0] == 0 && (errno == 0 || errno == ECONNRESET))
1820 errno = ERRNO_SMTPCLOSED;
1821 goto EHLOHELO_FAILED;
1823 Ustrncpy(sx->buffer, rsp, sizeof(sx->buffer)/2);
1824 goto RESPONSE_FAILED;
1828 sx->avoid_option = sx->peer_offered = smtp_peer_options = 0;
1830 if (sx->esmtp || sx->lmtp)
1832 sx->peer_offered = ehlo_response(sx->buffer,
1833 OPTION_TLS /* others checked later */
1836 /* Set tls_offered if the response to EHLO specifies support for STARTTLS. */
1839 smtp_peer_options |= sx->peer_offered & OPTION_TLS;
1844 /* For continuing deliveries down the same channel, having re-exec'd the socket
1845 is the standard input; for a socket held open from verify it is recorded
1846 in the cutthrough context block. Either way we don't need to redo EHLO here
1847 (but may need to do so for TLS - see below).
1848 Set up the pointer to where subsequent commands will be left, for
1849 error messages. Note that smtp_peer_options will have been
1850 set from the command line if they were set in the process that passed the
1853 /*XXX continue case needs to propagate DSN_INFO, prob. in deliver.c
1854 as the continue goes via transport_pass_socket() and doublefork and exec.
1855 It does not wait. Unclear how we keep separate host's responses
1856 separate - we could match up by host ip+port as a bodge. */
1860 if (cutthrough.fd >= 0 && cutthrough.callout_hold_only)
1862 sx->inblock.sock = sx->outblock.sock = cutthrough.fd;
1863 sx->host->port = sx->port = cutthrough.host.port;
1867 sx->inblock.sock = sx->outblock.sock = 0; /* stdin */
1868 smtp_port_for_connect(sx->host, sx->port); /* Record the port that was used */
1870 smtp_command = big_buffer;
1871 sx->helo_data = NULL; /* ensure we re-expand ob->helo_data */
1873 /* For a continued connection with TLS being proxied for us, or a
1874 held-open verify connection with TLS, nothing more to do. */
1876 if ( continue_proxy_cipher
1877 || (cutthrough.fd >= 0 && cutthrough.callout_hold_only && cutthrough.is_tls)
1880 sx->peer_offered = smtp_peer_options;
1881 pipelining_active = !!(smtp_peer_options & OPTION_PIPE);
1882 HDEBUG(D_transport) debug_printf("continued connection, %s TLS\n",
1883 continue_proxy_cipher ? "proxied" : "verify conn with");
1886 HDEBUG(D_transport) debug_printf("continued connection, no TLS\n");
1889 /* If TLS is available on this connection, whether continued or not, attempt to
1890 start up a TLS session, unless the host is in hosts_avoid_tls. If successful,
1891 send another EHLO - the server may give a different answer in secure mode. We
1892 use a separate buffer for reading the response to STARTTLS so that if it is
1893 negative, the original EHLO data is available for subsequent analysis, should
1894 the client not be required to use TLS. If the response is bad, copy the buffer
1895 for error analysis. */
1898 if ( smtp_peer_options & OPTION_TLS
1900 && verify_check_given_host(&sx->ob->hosts_avoid_tls, sx->host) != OK
1902 || verify_check_given_host(&sx->ob->hosts_verify_avoid_tls, sx->host) != OK
1905 uschar buffer2[4096];
1906 if (smtp_write_command(&sx->outblock, SCMD_FLUSH, "STARTTLS\r\n") < 0)
1909 /* If there is an I/O error, transmission of this message is deferred. If
1910 there is a temporary rejection of STARRTLS and tls_tempfail_tryclear is
1911 false, we also defer. However, if there is a temporary rejection of STARTTLS
1912 and tls_tempfail_tryclear is true, or if there is an outright rejection of
1913 STARTTLS, we carry on. This means we will try to send the message in clear,
1914 unless the host is in hosts_require_tls (tested below). */
1916 if (!smtp_read_response(&sx->inblock, buffer2, sizeof(buffer2), '2',
1917 sx->ob->command_timeout))
1921 || (buffer2[0] == '4' && !sx->ob->tls_tempfail_tryclear)
1924 Ustrncpy(sx->buffer, buffer2, sizeof(sx->buffer));
1925 sx->buffer[sizeof(sx->buffer)-1] = '\0';
1926 goto RESPONSE_FAILED;
1930 /* STARTTLS accepted: try to negotiate a TLS session. */
1935 address_item * addr;
1937 int rc = tls_client_start(sx->inblock.sock, sx->host, sx->addrlist, sx->tblock,
1938 # ifdef EXPERIMENTAL_DANE
1939 sx->dane ? &tlsa_dnsa : NULL,
1943 /* TLS negotiation failed; give an error. From outside, this function may
1944 be called again to try in clear on a new connection, if the options permit
1945 it for this host. */
1949 # ifdef EXPERIMENTAL_DANE
1950 if (sx->dane) log_write(0, LOG_MAIN,
1951 "DANE attempt failed; TLS connection to %s [%s]: %s",
1952 sx->host->name, sx->host->address, errstr);
1955 errno = ERRNO_TLSFAILURE;
1956 message = string_sprintf("TLS session: %s", errstr);
1957 sx->send_quit = FALSE;
1961 /* TLS session is set up */
1963 smtp_peer_options_wrap = smtp_peer_options;
1964 for (addr = sx->addrlist; addr; addr = addr->next)
1965 if (addr->transport_return == PENDING_DEFER)
1967 addr->cipher = tls_out.cipher;
1968 addr->ourcert = tls_out.ourcert;
1969 addr->peercert = tls_out.peercert;
1970 addr->peerdn = tls_out.peerdn;
1971 addr->ocsp = tls_out.ocsp;
1976 /* if smtps, we'll have smtp_command set to something else; always safe to
1978 smtp_command = big_buffer;
1980 /* If we started TLS, redo the EHLO/LHLO exchange over the secure channel. If
1981 helo_data is null, we are dealing with a connection that was passed from
1982 another process, and so we won't have expanded helo_data above. We have to
1983 expand it here. $sending_ip_address and $sending_port are set up right at the
1984 start of the Exim process (in exim.c). */
1986 if (tls_out.active >= 0)
1991 if (!sx->helo_data && !(sx->helo_data = expand_string(sx->ob->helo_data)))
1993 uschar *message = string_sprintf("failed to expand helo_data: %s",
1994 expand_string_message);
1995 set_errno_nohost(sx->addrlist, ERRNO_EXPANDFAIL, message, DEFER, FALSE);
2000 /* For SMTPS we need to wait for the initial OK response. */
2003 good_response = smtp_read_response(&sx->inblock, sx->buffer, sizeof(sx->buffer),
2004 '2', sx->ob->command_timeout);
2005 #ifdef EXPERIMENTAL_DSN_INFO
2006 sx->smtp_greeting = string_copy(sx->buffer);
2008 if (!good_response) goto RESPONSE_FAILED;
2012 greeting_cmd = "EHLO";
2015 greeting_cmd = "HELO";
2017 debug_printf("not sending EHLO (host matches hosts_avoid_esmtp)\n");
2020 if (smtp_write_command(&sx->outblock, SCMD_FLUSH, "%s %s\r\n",
2021 sx->lmtp ? "LHLO" : greeting_cmd, sx->helo_data) < 0)
2023 good_response = smtp_read_response(&sx->inblock, sx->buffer, sizeof(sx->buffer),
2024 '2', sx->ob->command_timeout);
2025 #ifdef EXPERIMENTAL_DSN_INFO
2026 sx->helo_response = string_copy(sx->buffer);
2028 if (!good_response) goto RESPONSE_FAILED;
2029 smtp_peer_options = 0;
2032 /* If the host is required to use a secure channel, ensure that we
2036 # ifdef EXPERIMENTAL_DANE
2039 || verify_check_given_host(&sx->ob->hosts_require_tls, sx->host) == OK
2042 errno = ERRNO_TLSREQUIRED;
2043 message = string_sprintf("a TLS session is required, but %s",
2044 smtp_peer_options & OPTION_TLS
2045 ? "an attempt to start TLS failed" : "the server did not offer TLS support");
2048 #endif /*SUPPORT_TLS*/
2050 /* If TLS is active, we have just started it up and re-done the EHLO command,
2051 so its response needs to be analyzed. If TLS is not active and this is a
2052 continued session down a previously-used socket, we haven't just done EHLO, so
2055 if (continue_hostname == NULL
2057 || tls_out.active >= 0
2061 if (sx->esmtp || sx->lmtp)
2063 sx->peer_offered = ehlo_response(sx->buffer,
2065 | (sx->lmtp && sx->ob->lmtp_ignore_quota ? OPTION_IGNQ : 0)
2069 | (sx->addrlist->prop.utf8_msg ? OPTION_UTF8 : 0)
2070 /*XXX if we hand peercaps on to continued-conn processes,
2071 must not depend on this addr */
2075 | (sx->ob->size_addition >= 0 ? OPTION_SIZE : 0)
2078 /* Set for IGNOREQUOTA if the response to LHLO specifies support and the
2079 lmtp_ignore_quota option was set. */
2081 sx->igquotstr = sx->peer_offered & OPTION_IGNQ ? US" IGNOREQUOTA" : US"";
2083 /* If the response to EHLO specified support for the SIZE parameter, note
2084 this, provided size_addition is non-negative. */
2086 smtp_peer_options |= sx->peer_offered & OPTION_SIZE;
2088 /* Note whether the server supports PIPELINING. If hosts_avoid_esmtp matched
2089 the current host, esmtp will be false, so PIPELINING can never be used. If
2090 the current host matches hosts_avoid_pipelining, don't do it. */
2092 if ( sx->peer_offered & OPTION_PIPE
2093 && verify_check_given_host(&sx->ob->hosts_avoid_pipelining, sx->host) != OK)
2094 smtp_peer_options |= OPTION_PIPE;
2096 DEBUG(D_transport) debug_printf("%susing PIPELINING\n",
2097 smtp_peer_options & OPTION_PIPE ? "" : "not ");
2099 if ( sx->peer_offered & OPTION_CHUNKING
2100 && verify_check_given_host(&sx->ob->hosts_try_chunking, sx->host) != OK)
2101 sx->peer_offered &= ~OPTION_CHUNKING;
2103 if (sx->peer_offered & OPTION_CHUNKING)
2104 {DEBUG(D_transport) debug_printf("CHUNKING usable\n");}
2106 #ifndef DISABLE_PRDR
2107 if ( sx->peer_offered & OPTION_PRDR
2108 && verify_check_given_host(&sx->ob->hosts_try_prdr, sx->host) != OK)
2109 sx->peer_offered &= ~OPTION_PRDR;
2111 if (sx->peer_offered & OPTION_PRDR)
2112 {DEBUG(D_transport) debug_printf("PRDR usable\n");}
2115 /* Note if the server supports DSN */
2116 smtp_peer_options |= sx->peer_offered & OPTION_DSN;
2117 DEBUG(D_transport) debug_printf("%susing DSN\n",
2118 sx->peer_offered & OPTION_DSN ? "" : "not ");
2120 /* Note if the response to EHLO specifies support for the AUTH extension.
2121 If it has, check that this host is one we want to authenticate to, and do
2122 the business. The host name and address must be available when the
2123 authenticator's client driver is running. */
2125 switch (yield = smtp_auth(sx->buffer, sizeof(sx->buffer), sx->addrlist, sx->host,
2126 sx->ob, sx->esmtp, &sx->inblock, &sx->outblock))
2128 default: goto SEND_QUIT;
2130 case FAIL_SEND: goto SEND_FAILED;
2131 case FAIL: goto RESPONSE_FAILED;
2135 pipelining_active = !!(smtp_peer_options & OPTION_PIPE);
2137 /* The setting up of the SMTP call is now complete. Any subsequent errors are
2138 message-specific. */
2140 sx->setting_up = FALSE;
2143 if (sx->addrlist->prop.utf8_msg)
2145 sx->utf8_needed = !sx->addrlist->prop.utf8_downcvt
2146 && !sx->addrlist->prop.utf8_downcvt_maybe;
2147 DEBUG(D_transport) if (!sx->utf8_needed)
2148 debug_printf("utf8: %s downconvert\n",
2149 sx->addrlist->prop.utf8_downcvt ? "mandatory" : "optional");
2152 /* If this is an international message we need the host to speak SMTPUTF8 */
2153 if (sx->utf8_needed && !(sx->peer_offered & OPTION_UTF8))
2155 errno = ERRNO_UTF8_FWD;
2156 goto RESPONSE_FAILED;
2168 sx->send_quit = check_response(sx->host, &errno, sx->addrlist->more_errno,
2169 sx->buffer, &code, &message, &pass_message);
2174 message = US string_sprintf("send() to %s [%s] failed: %s",
2175 sx->host->name, sx->host->address, strerror(errno));
2176 sx->send_quit = FALSE;
2179 /* This label is jumped to directly when a TLS negotiation has failed,
2180 or was not done for a host for which it is required. Values will be set
2181 in message and errno, and setting_up will always be true. Treat as
2182 a temporary error. */
2186 message = string_sprintf("Remote host closed connection in response to %s"
2187 " (EHLO response was: %s)", smtp_command, sx->buffer);
2188 sx->send_quit = FALSE;
2197 /* The failure happened while setting up the call; see if the failure was
2198 a 5xx response (this will either be on connection, or following HELO - a 5xx
2199 after EHLO causes it to try HELO). If so, and there are no more hosts to try,
2200 fail all addresses, as this host is never going to accept them. For other
2201 errors during setting up (timeouts or whatever), defer all addresses, and
2202 yield DEFER, so that the host is not tried again for a while.
2204 XXX This peeking for another host feels like a layering violation. We want
2205 to note the host as unusable, but down here we shouldn't know if this was
2206 the last host to try for the addr(list). Perhaps the upper layer should be
2207 the one to do set_errno() ? The problem is that currently the addr is where
2208 errno etc. are stashed, but until we run out of hosts to try the errors are
2209 host-specific. Maybe we should enhance the host_item definition? */
2212 sx->ok = FALSE; /* For when reached by GOTO */
2213 set_errno(sx->addrlist, errno, message,
2218 || errno == ERRNO_UTF8_FWD
2221 pass_message, sx->host
2222 #ifdef EXPERIMENTAL_DSN_INFO
2223 , sx->smtp_greeting, sx->helo_response
2233 (void)smtp_write_command(&sx->outblock, SCMD_FLUSH, "QUIT\r\n");
2236 tls_close(FALSE, TRUE);
2239 /* Close the socket, and return the appropriate value, first setting
2240 works because the NULL setting is passed back to the calling process, and
2241 remote_max_parallel is forced to 1 when delivering over an existing connection,
2244 HDEBUG(D_transport|D_acl|D_v) debug_printf_indent(" SMTP(close)>>\n");
2247 shutdown(sx->outblock.sock, SHUT_WR);
2248 if (fcntl(sx->inblock.sock, F_SETFL, O_NONBLOCK) == 0)
2249 for (rc = 16; read(sx->inblock.sock, sx->inbuffer, sizeof(sx->inbuffer)) > 0 && rc > 0;)
2250 rc--; /* drain socket */
2251 sx->send_quit = FALSE;
2253 (void)close(sx->inblock.sock);
2254 sx->inblock.sock = sx->outblock.sock = -1;
2256 #ifndef DISABLE_EVENT
2257 (void) event_raise(sx->tblock->event_action, US"tcp:close", NULL);
2260 continue_transport = NULL;
2261 continue_hostname = NULL;
2268 /* Create the string of options that will be appended to the MAIL FROM:
2269 in the connection context buffer */
2272 build_mailcmd_options(smtp_context * sx, address_item * addrlist)
2274 uschar * p = sx->buffer;
2275 address_item * addr;
2280 /* If we know the receiving MTA supports the SIZE qualification, and we know it,
2281 send it, adding something to the message size to allow for imprecision
2282 and things that get added en route. Exim keeps the number of lines
2283 in a message, so we can give an accurate value for the original message, but we
2284 need some additional to handle added headers. (Double "." characters don't get
2285 included in the count.) */
2287 if ( message_size > 0
2288 && sx->peer_offered & OPTION_SIZE && !(sx->avoid_option & OPTION_SIZE))
2290 /*XXX problem here under spool_files_wireformat?
2291 Or just forget about lines? Or inflate by a fixed proportion? */
2293 sprintf(CS p, " SIZE=%d", message_size+message_linecount+sx->ob->size_addition);
2297 #ifndef DISABLE_PRDR
2298 /* If it supports Per-Recipient Data Reponses, and we have omre than one recipient,
2301 sx->prdr_active = FALSE;
2302 if (sx->peer_offered & OPTION_PRDR)
2303 for (addr = addrlist; addr; addr = addr->next)
2304 if (addr->transport_return == PENDING_DEFER)
2306 for (addr = addr->next; addr; addr = addr->next)
2307 if (addr->transport_return == PENDING_DEFER)
2308 { /* at least two recipients to send */
2309 sx->prdr_active = TRUE;
2310 sprintf(CS p, " PRDR"); p += 5;
2318 /* If it supports internationalised messages, and this meesage need that,
2321 if ( sx->peer_offered & OPTION_UTF8
2322 && addrlist->prop.utf8_msg
2323 && !addrlist->prop.utf8_downcvt
2325 Ustrcpy(p, " SMTPUTF8"), p += 9;
2328 /* check if all addresses have DSN-lasthop flag; do not send RET and ENVID if so */
2329 for (sx->dsn_all_lasthop = TRUE, addr = addrlist, address_count = 0;
2330 addr && address_count < sx->max_rcpt;
2331 addr = addr->next) if (addr->transport_return == PENDING_DEFER)
2334 if (!(addr->dsn_flags & rf_dsnlasthop))
2336 sx->dsn_all_lasthop = FALSE;
2341 /* Add any DSN flags to the mail command */
2343 if (sx->peer_offered & OPTION_DSN && !sx->dsn_all_lasthop)
2345 if (dsn_ret == dsn_ret_hdrs)
2346 { Ustrcpy(p, " RET=HDRS"); p += 9; }
2347 else if (dsn_ret == dsn_ret_full)
2348 { Ustrcpy(p, " RET=FULL"); p += 9; }
2352 string_format(p, sizeof(sx->buffer) - (p-sx->buffer), " ENVID=%s", dsn_envid);
2357 /* If an authenticated_sender override has been specified for this transport
2358 instance, expand it. If the expansion is forced to fail, and there was already
2359 an authenticated_sender for this message, the original value will be used.
2360 Other expansion failures are serious. An empty result is ignored, but there is
2361 otherwise no check - this feature is expected to be used with LMTP and other
2362 cases where non-standard addresses (e.g. without domains) might be required. */
2364 if (smtp_mail_auth_str(p, sizeof(sx->buffer) - (p-sx->buffer), addrlist, sx->ob))
2372 build_rcptcmd_options(smtp_context * sx, const address_item * addr)
2374 uschar * p = sx->buffer;
2377 /* Add any DSN flags to the rcpt command */
2379 if (sx->peer_offered & OPTION_DSN && !(addr->dsn_flags & rf_dsnlasthop))
2381 if (addr->dsn_flags & rf_dsnflags)
2386 Ustrcpy(p, " NOTIFY=");
2388 for (i = 0; i < nelem(rf_list); i++) if (addr->dsn_flags & rf_list[i])
2390 if (!first) *p++ = ',';
2392 Ustrcpy(p, rf_names[i]);
2397 if (addr->dsn_orcpt)
2399 string_format(p, sizeof(sx->buffer) - (p-sx->buffer), " ORCPT=%s",
2410 0 good, rcpt results in addr->transport_return (PENDING_OK, DEFER, FAIL)
2411 -1 MAIL response error
2412 -2 any non-MAIL read i/o error
2413 -3 non-MAIL response timeout
2414 -4 internal error; channel still usable
2419 smtp_write_mail_and_rcpt_cmds(smtp_context * sx, int * yield)
2421 address_item * addr;
2425 if (build_mailcmd_options(sx, sx->first_addr) != OK)
2431 /* From here until we send the DATA command, we can make use of PIPELINING
2432 if the server host supports it. The code has to be able to check the responses
2433 at any point, for when the buffer fills up, so we write it totally generally.
2434 When PIPELINING is off, each command written reports that it has flushed the
2437 sx->pending_MAIL = TRUE; /* The block starts with MAIL */
2440 uschar * s = sx->from_addr;
2442 uschar * errstr = NULL;
2444 /* If we must downconvert, do the from-address here. Remember we had to
2445 for the to-addresses (done below), and also (ugly) for re-doing when building
2446 the delivery log line. */
2448 if ( sx->addrlist->prop.utf8_msg
2449 && (sx->addrlist->prop.utf8_downcvt || !(sx->peer_offered & OPTION_UTF8))
2452 if (s = string_address_utf8_to_alabel(s, &errstr), errstr)
2454 set_errno_nohost(sx->addrlist, ERRNO_EXPANDFAIL, errstr, DEFER, FALSE);
2458 setflag(sx->addrlist, af_utf8_downcvt);
2462 rc = smtp_write_command(&sx->outblock, pipelining_active ? SCMD_BUFFER : SCMD_FLUSH,
2463 "MAIL FROM:<%s>%s\r\n", s, sx->buffer);
2466 mail_command = string_copy(big_buffer); /* Save for later error message */
2470 case -1: /* Transmission error */
2473 case +1: /* Cmd was sent */
2474 if (!smtp_read_response(&sx->inblock, sx->buffer, sizeof(sx->buffer), '2',
2475 sx->ob->command_timeout))
2477 if (errno == 0 && sx->buffer[0] == '4')
2479 errno = ERRNO_MAIL4XX;
2480 sx->addrlist->more_errno |= ((sx->buffer[1] - '0')*10 + sx->buffer[2] - '0') << 8;
2484 sx->pending_MAIL = FALSE;
2487 /* otherwise zero: command queued for pipeline */
2490 /* Pass over all the relevant recipient addresses for this host, which are the
2491 ones that have status PENDING_DEFER. If we are using PIPELINING, we can send
2492 several before we have to read the responses for those seen so far. This
2493 checking is done by a subroutine because it also needs to be done at the end.
2494 Send only up to max_rcpt addresses at a time, leaving next_addr pointing to
2495 the next one if not all are sent.
2497 In the MUA wrapper situation, we want to flush the PIPELINING buffer for the
2498 last address because we want to abort if any recipients have any kind of
2499 problem, temporary or permanent. We know that all recipient addresses will have
2500 the PENDING_DEFER status, because only one attempt is ever made, and we know
2501 that max_rcpt will be large, so all addresses will be done at once.
2503 For verify we flush the pipeline after any (the only) rcpt address. */
2505 for (addr = sx->first_addr, address_count = 0;
2506 addr && address_count < sx->max_rcpt;
2507 addr = addr->next) if (addr->transport_return == PENDING_DEFER)
2513 if (tcp_out_fastopen && !tcp_out_fastopen_logged)
2515 setflag(addr, af_tcp_fastopen_conn);
2516 if (tcp_out_fastopen > 1) setflag(addr, af_tcp_fastopen);
2519 addr->dsn_aware = sx->peer_offered & OPTION_DSN
2520 ? dsn_support_yes : dsn_support_no;
2523 no_flush = pipelining_active && !sx->verify
2524 && (!mua_wrapper || addr->next && address_count < sx->max_rcpt);
2526 build_rcptcmd_options(sx, addr);
2528 /* Now send the RCPT command, and process outstanding responses when
2529 necessary. After a timeout on RCPT, we just end the function, leaving the
2530 yield as OK, because this error can often mean that there is a problem with
2531 just one address, so we don't want to delay the host. */
2533 rcpt_addr = transport_rcpt_address(addr, sx->tblock->rcpt_include_affixes);
2536 if ( testflag(sx->addrlist, af_utf8_downcvt)
2537 && !(rcpt_addr = string_address_utf8_to_alabel(rcpt_addr, NULL))
2540 /*XXX could we use a per-address errstr here? Not fail the whole send? */
2541 errno = ERRNO_EXPANDFAIL;
2542 return -5; /*XXX too harsh? */
2546 count = smtp_write_command(&sx->outblock, no_flush ? SCMD_BUFFER : SCMD_FLUSH,
2547 "RCPT TO:<%s>%s%s\r\n", rcpt_addr, sx->igquotstr, sx->buffer);
2549 if (count < 0) return -5;
2552 switch(sync_responses(sx, count, 0))
2554 case 3: sx->ok = TRUE; /* 2xx & 5xx => OK & progress made */
2555 case 2: sx->completed_addr = TRUE; /* 5xx (only) => progress made */
2558 case 1: sx->ok = TRUE; /* 2xx (only) => OK, but if LMTP, */
2559 if (!sx->lmtp) /* can't tell about progress yet */
2560 sx->completed_addr = TRUE;
2561 case 0: /* No 2xx or 5xx, but no probs */
2564 case -1: return -3; /* Timeout on RCPT */
2565 case -2: return -2; /* non-MAIL read i/o error */
2566 default: return -1; /* any MAIL error */
2568 sx->pending_MAIL = FALSE; /* Dealt with MAIL */
2570 } /* Loop for next address */
2572 tcp_out_fastopen_logged = TRUE;
2573 sx->next_addr = addr;
2579 /*****************************************************
2580 * Proxy TLS connection for another transport process *
2581 ******************************************************/
2583 Use the given buffer as a staging area, and select on both the given fd
2584 and the TLS'd client-fd for data to read (per the coding in ip_recv() and
2585 fd_ready() this is legitimate). Do blocking full-size writes, and reads
2589 buf space to use for buffering
2590 bufsiz size of buffer
2591 proxy_fd comms to proxied process
2592 timeout per-read timeout, seconds
2596 smtp_proxy_tls(uschar * buf, size_t bsize, int proxy_fd, int timeout)
2599 int max_fd = MAX(proxy_fd, tls_out.active) + 1;
2600 int rc, i, fd_bits, nbytes;
2602 set_process_info("proxying TLS connection for continued transport");
2604 FD_SET(tls_out.active, &rfds);
2605 FD_SET(proxy_fd, &rfds);
2607 for (fd_bits = 3; fd_bits; )
2609 time_t time_left = timeout;
2610 time_t time_start = time(NULL);
2616 struct timeval tv = { time_left, 0 };
2619 (SELECT_ARG2_TYPE *)&rfds, NULL, (SELECT_ARG2_TYPE *)&efds, &tv);
2621 if (rc < 0 && errno == EINTR)
2622 if ((time_left -= time(NULL) - time_start) > 0) continue;
2626 DEBUG(D_transport) if (rc == 0) debug_printf("%s: timed out\n", __FUNCTION__);
2630 if (FD_ISSET(tls_out.active, &efds) || FD_ISSET(proxy_fd, &efds))
2632 DEBUG(D_transport) debug_printf("select: exceptional cond on %s fd\n",
2633 FD_ISSET(proxy_fd, &efds) ? "proxy" : "tls");
2637 while (rc < 0 || !(FD_ISSET(tls_out.active, &rfds) || FD_ISSET(proxy_fd, &rfds)));
2639 /* handle inbound data */
2640 if (FD_ISSET(tls_out.active, &rfds))
2641 if ((rc = tls_read(FALSE, buf, bsize)) <= 0)
2644 FD_CLR(tls_out.active, &rfds);
2645 shutdown(proxy_fd, SHUT_WR);
2650 for (nbytes = 0; rc - nbytes > 0; nbytes += i)
2651 if ((i = write(proxy_fd, buf + nbytes, rc - nbytes)) < 0) return;
2653 else if (fd_bits & 1)
2654 FD_SET(tls_out.active, &rfds);
2656 /* handle outbound data */
2657 if (FD_ISSET(proxy_fd, &rfds))
2658 if ((rc = read(proxy_fd, buf, bsize)) <= 0)
2661 tls_close(FALSE, TRUE);
2665 for (nbytes = 0; rc - nbytes > 0; nbytes += i)
2666 if ((i = tls_write(FALSE, buf + nbytes, rc - nbytes, FALSE)) < 0)
2669 else if (fd_bits & 2)
2670 FD_SET(proxy_fd, &rfds);
2676 /*************************************************
2677 * Deliver address list to given host *
2678 *************************************************/
2680 /* If continue_hostname is not null, we get here only when continuing to
2681 deliver down an existing channel. The channel was passed as the standard
2682 input. TLS is never active on a passed channel; the previous process always
2683 closes it down before passing the connection on.
2685 Otherwise, we have to make a connection to the remote host, and do the
2686 initial protocol exchange.
2688 When running as an MUA wrapper, if the sender or any recipient is rejected,
2689 temporarily or permanently, we force failure for all recipients.
2692 addrlist chain of potential addresses to deliver; only those whose
2693 transport_return field is set to PENDING_DEFER are currently
2694 being processed; others should be skipped - they have either
2695 been delivered to an earlier host or IP address, or been
2696 failed by one of them.
2697 host host to deliver to
2698 host_af AF_INET or AF_INET6
2699 defport default TCP/IP port to use if host does not specify, in host
2701 interface interface to bind to, or NULL
2702 tblock transport instance block
2703 message_defer set TRUE if yield is OK, but all addresses were deferred
2704 because of a non-recipient, non-host failure, that is, a
2705 4xx response to MAIL FROM, DATA, or ".". This is a defer
2706 that is specific to the message.
2707 suppress_tls if TRUE, don't attempt a TLS connection - this is set for
2708 a second attempt after TLS initialization fails
2710 Returns: OK - the connection was made and the delivery attempted;
2711 the result for each address is in its data block.
2712 DEFER - the connection could not be made, or something failed
2713 while setting up the SMTP session, or there was a
2714 non-message-specific error, such as a timeout.
2715 ERROR - a filter command is specified for this transport,
2716 and there was a problem setting it up; OR helo_data
2717 or add_headers or authenticated_sender is specified
2718 for this transport, and the string failed to expand
2722 smtp_deliver(address_item *addrlist, host_item *host, int host_af, int defport,
2723 uschar *interface, transport_instance *tblock,
2724 BOOL *message_defer, BOOL suppress_tls)
2730 struct timeval start_delivery_time;
2732 BOOL pass_message = FALSE;
2733 uschar *message = NULL;
2734 uschar new_message_id[MESSAGE_ID_LENGTH + 1];
2738 gettimeofday(&start_delivery_time, NULL);
2739 suppress_tls = suppress_tls; /* stop compiler warning when no TLS support */
2740 *message_defer = FALSE;
2742 sx.addrlist = addrlist;
2744 sx.host_af = host_af,
2746 sx.interface = interface;
2747 sx.helo_data = NULL;
2751 /* Get the channel set up ready for a message (MAIL FROM being the next
2752 SMTP command to send */
2754 if ((rc = smtp_setup_conn(&sx, suppress_tls)) != OK)
2757 /* If there is a filter command specified for this transport, we can now
2758 set it up. This cannot be done until the identify of the host is known. */
2760 if (tblock->filter_command)
2762 transport_filter_timeout = tblock->filter_timeout;
2764 /* On failure, copy the error to all addresses, abandon the SMTP call, and
2767 if (!transport_set_up_command(&transport_filter_argv,
2768 tblock->filter_command, TRUE, DEFER, addrlist,
2769 string_sprintf("%.50s transport", tblock->name), NULL))
2771 set_errno_nohost(addrlist->next, addrlist->basic_errno, addrlist->message, DEFER,
2777 if ( transport_filter_argv
2778 && *transport_filter_argv
2779 && **transport_filter_argv
2780 && sx.peer_offered & OPTION_CHUNKING
2783 sx.peer_offered &= ~OPTION_CHUNKING;
2784 DEBUG(D_transport) debug_printf("CHUNKING not usable due to transport filter\n");
2788 sx.first_addr = addrlist;
2790 /* For messages that have more than the maximum number of envelope recipients,
2791 we want to send several transactions down the same SMTP connection. (See
2792 comments in deliver.c as to how this reconciles, heuristically, with
2793 remote_max_parallel.) This optimization was added to Exim after the following
2794 code was already working. The simplest way to put it in without disturbing the
2795 code was to use a goto to jump back to this point when there is another
2796 transaction to handle. */
2799 sx.from_addr = return_path;
2800 sx.sync_addr = sx.first_addr;
2802 sx.send_rset = TRUE;
2803 sx.completed_addr = FALSE;
2806 /* If we are a continued-connection-after-verify the MAIL and RCPT
2807 commands were already sent; do not re-send but do mark the addrs as
2808 having been accepted up to RCPT stage. A traditional cont-conn
2809 always has a sequence number greater than one. */
2811 if (continue_hostname && continue_sequence == 1)
2813 address_item * addr;
2815 sx.peer_offered = smtp_peer_options;
2816 sx.pending_MAIL = FALSE;
2818 sx.next_addr = NULL;
2820 for (addr = addrlist; addr; addr = addr->next)
2821 addr->transport_return = PENDING_OK;
2825 /* Initiate a message transfer. */
2827 switch(smtp_write_mail_and_rcpt_cmds(&sx, &yield))
2830 case -1: case -2: goto RESPONSE_FAILED;
2831 case -3: goto END_OFF;
2832 case -4: goto SEND_QUIT;
2833 default: goto SEND_FAILED;
2836 /* If we are an MUA wrapper, abort if any RCPTs were rejected, either
2837 permanently or temporarily. We should have flushed and synced after the last
2845 for (a = sx.first_addr, cnt = 0; a && cnt < sx.max_rcpt; a = a->next, cnt++)
2846 if (a->transport_return != PENDING_OK)
2848 /*XXX could we find a better errno than 0 here? */
2849 set_errno_nohost(addrlist, 0, a->message, FAIL,
2850 testflag(a, af_pass_message));
2857 /* If ok is TRUE, we know we have got at least one good recipient, and must now
2858 send DATA, but if it is FALSE (in the normal, non-wrapper case), we may still
2859 have a good recipient buffered up if we are pipelining. We don't want to waste
2860 time sending DATA needlessly, so we only send it if either ok is TRUE or if we
2861 are pipelining. The responses are all handled by sync_responses().
2862 If using CHUNKING, do not send a BDAT until we know how big a chunk we want
2865 if ( !(sx.peer_offered & OPTION_CHUNKING)
2866 && (sx.ok || (pipelining_active && !mua_wrapper)))
2868 int count = smtp_write_command(&sx.outblock, SCMD_FLUSH, "DATA\r\n");
2870 if (count < 0) goto SEND_FAILED;
2871 switch(sync_responses(&sx, count, sx.ok ? +1 : -1))
2873 case 3: sx.ok = TRUE; /* 2xx & 5xx => OK & progress made */
2874 case 2: sx.completed_addr = TRUE; /* 5xx (only) => progress made */
2877 case 1: sx.ok = TRUE; /* 2xx (only) => OK, but if LMTP, */
2878 if (!sx.lmtp) sx.completed_addr = TRUE; /* can't tell about progress yet */
2879 case 0: break; /* No 2xx or 5xx, but no probs */
2881 case -1: goto END_OFF; /* Timeout on RCPT */
2882 default: goto RESPONSE_FAILED; /* I/O error, or any MAIL/DATA error */
2884 pipelining_active = FALSE;
2885 data_command = string_copy(big_buffer); /* Save for later error message */
2888 /* If there were no good recipients (but otherwise there have been no
2889 problems), just set ok TRUE, since we have handled address-specific errors
2890 already. Otherwise, it's OK to send the message. Use the check/escape mechanism
2891 for handling the SMTP dot-handling protocol, flagging to apply to headers as
2892 well as body. Set the appropriate timeout value to be used for each chunk.
2893 (Haven't been able to make it work using select() for writing yet.) */
2895 if (!(sx.peer_offered & OPTION_CHUNKING) && !sx.ok)
2897 /* Save the first address of the next batch. */
2898 sx.first_addr = sx.next_addr;
2904 transport_ctx tctx = {
2908 US".", US"..", /* Escaping strings */
2909 topt_use_crlf | topt_escape_headers
2910 | (tblock->body_only ? topt_no_headers : 0)
2911 | (tblock->headers_only ? topt_no_body : 0)
2912 | (tblock->return_path_add ? topt_add_return_path : 0)
2913 | (tblock->delivery_date_add ? topt_add_delivery_date : 0)
2914 | (tblock->envelope_to_add ? topt_add_envelope_to : 0)
2917 /* If using CHUNKING we need a callback from the generic transport
2918 support to us, for the sending of BDAT smtp commands and the reaping
2919 of responses. The callback needs a whole bunch of state so set up
2920 a transport-context structure to be passed around. */
2922 if (sx.peer_offered & OPTION_CHUNKING)
2924 tctx.check_string = tctx.escape_string = NULL;
2925 tctx.options |= topt_use_bdat;
2926 tctx.chunk_cb = smtp_chunk_cmd_callback;
2927 sx.pending_BDAT = FALSE;
2928 sx.good_RCPT = sx.ok;
2930 tctx.smtp_context = &sx;
2933 tctx.options |= topt_end_dot;
2935 /* Save the first address of the next batch. */
2936 sx.first_addr = sx.next_addr;
2938 /* Responses from CHUNKING commands go in buffer. Otherwise,
2939 there has not been a response. */
2943 sigalrm_seen = FALSE;
2944 transport_write_timeout = sx.ob->data_timeout;
2945 smtp_command = US"sending data block"; /* For error messages */
2946 DEBUG(D_transport|D_v)
2947 if (sx.peer_offered & OPTION_CHUNKING)
2948 debug_printf(" will write message using CHUNKING\n");
2950 debug_printf(" SMTP>> writing message and terminating \".\"\n");
2951 transport_count = 0;
2953 #ifndef DISABLE_DKIM
2954 sx.ok = dkim_transport_write_message(&tctx, &sx.ob->dkim, CUSS &message);
2956 sx.ok = transport_write_message(&tctx, 0);
2959 /* transport_write_message() uses write() because it is called from other
2960 places to write to non-sockets. This means that under some OS (e.g. Solaris)
2961 it can exit with "Broken pipe" as its error. This really means that the
2962 socket got closed at the far end. */
2964 transport_write_timeout = 0; /* for subsequent transports */
2966 /* Failure can either be some kind of I/O disaster (including timeout),
2967 or the failure of a transport filter or the expansion of added headers.
2968 Or, when CHUNKING, it can be a protocol-detected failure. */
2971 if (message) goto SEND_FAILED;
2972 else goto RESPONSE_FAILED;
2974 /* We used to send the terminating "." explicitly here, but because of
2975 buffering effects at both ends of TCP/IP connections, you don't gain
2976 anything by keeping it separate, so it might as well go in the final
2977 data buffer for efficiency. This is now done by setting the topt_end_dot
2980 smtp_command = US"end of data";
2982 if (sx.peer_offered & OPTION_CHUNKING && sx.cmd_count > 1)
2984 /* Reap any outstanding MAIL & RCPT commands, but not a DATA-go-ahead */
2985 switch(sync_responses(&sx, sx.cmd_count-1, 0))
2987 case 3: sx.ok = TRUE; /* 2xx & 5xx => OK & progress made */
2988 case 2: sx.completed_addr = TRUE; /* 5xx (only) => progress made */
2991 case 1: sx.ok = TRUE; /* 2xx (only) => OK, but if LMTP, */
2992 if (!sx.lmtp) sx.completed_addr = TRUE; /* can't tell about progress yet */
2993 case 0: break; /* No 2xx or 5xx, but no probs */
2995 case -1: goto END_OFF; /* Timeout on RCPT */
2996 default: goto RESPONSE_FAILED; /* I/O error, or any MAIL/DATA error */
3000 #ifndef DISABLE_PRDR
3001 /* For PRDR we optionally get a partial-responses warning
3002 * followed by the individual responses, before going on with
3003 * the overall response. If we don't get the warning then deal
3004 * with per non-PRDR. */
3007 sx.ok = smtp_read_response(&sx.inblock, sx.buffer, sizeof(sx.buffer), '3',
3008 sx.ob->final_timeout);
3009 if (!sx.ok && errno == 0) switch(sx.buffer[0])
3011 case '2': sx.prdr_active = FALSE;
3014 case '4': errno = ERRNO_DATA4XX;
3015 addrlist->more_errno |=
3016 ((sx.buffer[1] - '0')*10 + sx.buffer[2] - '0') << 8;
3023 /* For non-PRDR SMTP, we now read a single response that applies to the
3024 whole message. If it is OK, then all the addresses have been delivered. */
3028 sx.ok = smtp_read_response(&sx.inblock, sx.buffer, sizeof(sx.buffer), '2',
3029 sx.ob->final_timeout);
3030 if (!sx.ok && errno == 0 && sx.buffer[0] == '4')
3032 errno = ERRNO_DATA4XX;
3033 addrlist->more_errno |= ((sx.buffer[1] - '0')*10 + sx.buffer[2] - '0') << 8;
3037 /* For LMTP, we get back a response for every RCPT command that we sent;
3038 some may be accepted and some rejected. For those that get a response, their
3039 status is fixed; any that are accepted have been handed over, even if later
3040 responses crash - at least, that's how I read RFC 2033.
3042 If all went well, mark the recipient addresses as completed, record which
3043 host/IPaddress they were delivered to, and cut out RSET when sending another
3044 message down the same channel. Write the completed addresses to the journal
3045 now so that they are recorded in case there is a crash of hardware or
3046 software before the spool gets updated. Also record the final SMTP
3047 confirmation if needed (for SMTP only). */
3052 struct timeval delivery_time;
3054 uschar * conf = NULL;
3056 timesince(&delivery_time, &start_delivery_time);
3057 sx.send_rset = FALSE;
3058 pipelining_active = FALSE;
3060 /* Set up confirmation if needed - applies only to SMTP */
3063 #ifdef DISABLE_EVENT
3064 LOGGING(smtp_confirmation) &&
3069 const uschar *s = string_printing(sx.buffer);
3070 /* deconst cast ok here as string_printing was checked to have alloc'n'copied */
3071 conf = (s == sx.buffer)? US string_copy(s) : US s;
3074 /* Process all transported addresses - for LMTP or PRDR, read a status for
3077 for (addr = addrlist; addr != sx.first_addr; addr = addr->next)
3079 if (addr->transport_return != PENDING_OK) continue;
3081 /* LMTP - if the response fails badly (e.g. timeout), use it for all the
3082 remaining addresses. Otherwise, it's a return code for just the one
3083 address. For temporary errors, add a retry item for the address so that
3084 it doesn't get tried again too soon. */
3086 #ifndef DISABLE_PRDR
3087 if (sx.lmtp || sx.prdr_active)
3092 if (!smtp_read_response(&sx.inblock, sx.buffer, sizeof(sx.buffer), '2',
3093 sx.ob->final_timeout))
3095 if (errno != 0 || sx.buffer[0] == 0) goto RESPONSE_FAILED;
3096 addr->message = string_sprintf(
3097 #ifndef DISABLE_PRDR
3098 "%s error after %s: %s", sx.prdr_active ? "PRDR":"LMTP",
3100 "LMTP error after %s: %s",
3102 data_command, string_printing(sx.buffer));
3103 setflag(addr, af_pass_message); /* Allow message to go to user */
3104 if (sx.buffer[0] == '5')
3105 addr->transport_return = FAIL;
3108 errno = ERRNO_DATA4XX;
3109 addr->more_errno |= ((sx.buffer[1] - '0')*10 + sx.buffer[2] - '0') << 8;
3110 addr->transport_return = DEFER;
3111 #ifndef DISABLE_PRDR
3112 if (!sx.prdr_active)
3114 retry_add_item(addr, addr->address_retry_key, 0);
3118 sx.completed_addr = TRUE; /* NOW we can set this flag */
3119 if (LOGGING(smtp_confirmation))
3121 const uschar *s = string_printing(sx.buffer);
3122 /* deconst cast ok here as string_printing was checked to have alloc'n'copied */
3123 conf = (s == sx.buffer) ? US string_copy(s) : US s;
3127 /* SMTP, or success return from LMTP for this address. Pass back the
3128 actual host that was used. */
3130 addr->transport_return = OK;
3131 addr->more_errno = delivery_time.tv_sec;
3132 addr->delivery_usec = delivery_time.tv_usec;
3133 addr->host_used = host;
3134 addr->special_action = flag;
3135 addr->message = conf;
3136 #ifndef DISABLE_PRDR
3137 if (sx.prdr_active) setflag(addr, af_prdr_used);
3139 if (sx.peer_offered & OPTION_CHUNKING) setflag(addr, af_chunking_used);
3142 #ifndef DISABLE_PRDR
3143 if (!sx.prdr_active)
3146 /* Update the journal. For homonymic addresses, use the base address plus
3147 the transport name. See lots of comments in deliver.c about the reasons
3148 for the complications when homonyms are involved. Just carry on after
3149 write error, as it may prove possible to update the spool file later. */
3151 if (testflag(addr, af_homonym))
3152 sprintf(CS sx.buffer, "%.500s/%s\n", addr->unique + 3, tblock->name);
3154 sprintf(CS sx.buffer, "%.500s\n", addr->unique);
3156 DEBUG(D_deliver) debug_printf("S:journalling %s", sx.buffer);
3157 len = Ustrlen(CS sx.buffer);
3158 if (write(journal_fd, sx.buffer, len) != len)
3159 log_write(0, LOG_MAIN|LOG_PANIC, "failed to write journal for "
3160 "%s: %s", sx.buffer, strerror(errno));
3164 #ifndef DISABLE_PRDR
3167 /* PRDR - get the final, overall response. For any non-success
3168 upgrade all the address statuses. */
3169 sx.ok = smtp_read_response(&sx.inblock, sx.buffer, sizeof(sx.buffer), '2',
3170 sx.ob->final_timeout);
3173 if(errno == 0 && sx.buffer[0] == '4')
3175 errno = ERRNO_DATA4XX;
3176 addrlist->more_errno |= ((sx.buffer[1] - '0')*10 + sx.buffer[2] - '0') << 8;
3178 for (addr = addrlist; addr != sx.first_addr; addr = addr->next)
3179 if (sx.buffer[0] == '5' || addr->transport_return == OK)
3180 addr->transport_return = PENDING_OK; /* allow set_errno action */
3181 goto RESPONSE_FAILED;
3184 /* Update the journal, or setup retry. */
3185 for (addr = addrlist; addr != sx.first_addr; addr = addr->next)
3186 if (addr->transport_return == OK)
3188 if (testflag(addr, af_homonym))
3189 sprintf(CS sx.buffer, "%.500s/%s\n", addr->unique + 3, tblock->name);
3191 sprintf(CS sx.buffer, "%.500s\n", addr->unique);
3193 DEBUG(D_deliver) debug_printf("journalling(PRDR) %s\n", sx.buffer);
3194 len = Ustrlen(CS sx.buffer);
3195 if (write(journal_fd, sx.buffer, len) != len)
3196 log_write(0, LOG_MAIN|LOG_PANIC, "failed to write journal for "
3197 "%s: %s", sx.buffer, strerror(errno));
3199 else if (addr->transport_return == DEFER)
3200 retry_add_item(addr, addr->address_retry_key, -2);
3204 /* Ensure the journal file is pushed out to disk. */
3206 if (EXIMfsync(journal_fd) < 0)
3207 log_write(0, LOG_MAIN|LOG_PANIC, "failed to fsync journal: %s",
3213 /* Handle general (not specific to one address) failures here. The value of ok
3214 is used to skip over this code on the falling through case. A timeout causes a
3215 deferral. Other errors may defer or fail according to the response code, and
3216 may set up a special errno value, e.g. after connection chopped, which is
3217 assumed if errno == 0 and there is no text in the buffer. If control reaches
3218 here during the setting up phase (i.e. before MAIL FROM) then always defer, as
3219 the problem is not related to this specific message. */
3224 uschar * set_message;
3230 sx.send_quit = check_response(host, &save_errno, addrlist->more_errno,
3231 sx.buffer, &code, &message, &pass_message);
3239 message = string_sprintf("send() to %s [%s] failed: %s",
3240 host->name, host->address, message ? message : US strerror(save_errno));
3241 sx.send_quit = FALSE;
3249 sx.ok = FALSE; /* For when reached by GOTO */
3250 set_message = message;
3252 /* We want to handle timeouts after MAIL or "." and loss of connection after
3253 "." specially. They can indicate a problem with the sender address or with
3254 the contents of the message rather than a real error on the connection. These
3255 cases are treated in the same way as a 4xx response. This next bit of code
3256 does the classification. */
3263 message_error = TRUE;
3267 message_error = Ustrncmp(smtp_command,"MAIL",4) == 0 ||
3268 Ustrncmp(smtp_command,"end ",4) == 0;
3271 case ERRNO_SMTPCLOSED:
3272 message_error = Ustrncmp(smtp_command,"end ",4) == 0;
3276 message_error = FALSE;
3280 /* Handle the cases that are treated as message errors. These are:
3282 (a) negative response or timeout after MAIL
3283 (b) negative response after DATA
3284 (c) negative response or timeout or dropped connection after "."
3285 (d) utf8 support required and not offered
3287 It won't be a negative response or timeout after RCPT, as that is dealt
3288 with separately above. The action in all cases is to set an appropriate
3289 error code for all the addresses, but to leave yield set to OK because the
3290 host itself has not failed. Of course, it might in practice have failed
3291 when we've had a timeout, but if so, we'll discover that at the next
3292 delivery attempt. For a temporary error, set the message_defer flag, and
3293 write to the logs for information if this is not the last host. The error
3294 for the last host will be logged as part of the address's log line. */
3298 if (mua_wrapper) code = '5'; /* Force hard failure in wrapper mode */
3300 /* If there's an errno, the message contains just the identity of
3305 else /* Anything other than 5 is treated as temporary */
3309 message = US string_sprintf("%s: %s", message, strerror(save_errno));
3310 if (host->next != NULL) log_write(0, LOG_MAIN, "%s", message);
3311 msglog_line(host, message);
3312 *message_defer = TRUE;
3316 /* Otherwise, we have an I/O error or a timeout other than after MAIL or
3317 ".", or some other transportation error. We defer all addresses and yield
3318 DEFER, except for the case of failed add_headers expansion, or a transport
3319 filter failure, when the yield should be ERROR, to stop it trying other
3325 yield = (save_errno == ERRNO_CHHEADER_FAIL ||
3326 save_errno == ERRNO_FILTER_FAIL)? ERROR : DEFER;
3330 set_errno(addrlist, save_errno, set_message, set_rc, pass_message, host
3331 #ifdef EXPERIMENTAL_DSN_INFO
3332 , sx.smtp_greeting, sx.helo_response
3338 /* If all has gone well, send_quit will be set TRUE, implying we can end the
3339 SMTP session tidily. However, if there were too many addresses to send in one
3340 message (indicated by first_addr being non-NULL) we want to carry on with the
3341 rest of them. Also, it is desirable to send more than one message down the SMTP
3342 connection if there are several waiting, provided we haven't already sent so
3343 many as to hit the configured limit. The function transport_check_waiting looks
3344 for a waiting message and returns its id. Then transport_pass_socket tries to
3345 set up a continued delivery by passing the socket on to another process. The
3346 variable send_rset is FALSE if a message has just been successfully transfered.
3348 If we are already sending down a continued channel, there may be further
3349 addresses not yet delivered that are aimed at the same host, but which have not
3350 been passed in this run of the transport. In this case, continue_more will be
3351 true, and all we should do is send RSET if necessary, and return, leaving the
3354 However, if no address was disposed of, i.e. all addresses got 4xx errors, we
3355 do not want to continue with other messages down the same channel, because that
3356 can lead to looping between two or more messages, all with the same,
3357 temporarily failing address(es). [The retry information isn't updated yet, so
3358 new processes keep on trying.] We probably also don't want to try more of this
3359 message's addresses either.
3361 If we have started a TLS session, we have to end it before passing the
3362 connection to a new process. However, not all servers can handle this (Exim
3363 can), so we do not pass such a connection on if the host matches
3364 hosts_nopass_tls. */
3367 debug_printf("ok=%d send_quit=%d send_rset=%d continue_more=%d "
3368 "yield=%d first_address is %sNULL\n", sx.ok, sx.send_quit,
3369 sx.send_rset, continue_more, yield, sx.first_addr ? "not " : "");
3371 if (sx.completed_addr && sx.ok && sx.send_quit)
3374 smtp_compare_t t_compare;
3376 t_compare.tblock = tblock;
3377 t_compare.current_sender_address = sender_address;
3379 if ( sx.first_addr != NULL
3383 ( tls_out.active < 0 && !continue_proxy_cipher
3384 || verify_check_given_host(&sx.ob->hosts_nopass_tls, host) != OK
3388 transport_check_waiting(tblock->name, host->name,
3389 tblock->connection_max_messages, new_message_id, &more,
3390 (oicf)smtp_are_same_identities, (void*)&t_compare)
3397 if (! (sx.ok = smtp_write_command(&sx.outblock, SCMD_FLUSH, "RSET\r\n") >= 0))
3399 msg = US string_sprintf("send() to %s [%s] failed: %s", host->name,
3400 host->address, strerror(errno));
3401 sx.send_quit = FALSE;
3403 else if (! (sx.ok = smtp_read_response(&sx.inblock, sx.buffer,
3404 sizeof(sx.buffer), '2', sx.ob->command_timeout)))
3407 sx.send_quit = check_response(host, &errno, 0, sx.buffer, &code, &msg,
3411 DEBUG(D_transport) debug_printf("H=%s [%s] %s\n",
3412 host->name, host->address, msg);
3416 /* Either RSET was not needed, or it succeeded */
3421 int socket_fd = sx.inblock.sock;
3424 if (sx.first_addr != NULL) /* More addresses still to be sent */
3425 { /* in this run of the transport */
3426 continue_sequence++; /* Causes * in logging */
3430 /* Unless caller said it already has more messages listed for this host,
3431 pass the connection on to a new Exim process (below, the call to
3432 transport_pass_socket). If the caller has more ready, just return with
3433 the connection still open. */
3436 if (tls_out.active >= 0)
3438 || verify_check_given_host(&sx.ob->hosts_noproxy_tls, host) == OK)
3440 /* Before passing the socket on, or returning to caller with it still
3441 open, we must shut down TLS. Not all MTAs allow for the continuation
3442 of the SMTP session when TLS is shut down. We test for this by sending
3443 a new EHLO. If we don't get a good response, we don't attempt to pass
3446 tls_close(FALSE, TRUE);
3447 smtp_peer_options = smtp_peer_options_wrap;
3449 && smtp_write_command(&sx.outblock, SCMD_FLUSH,
3450 "EHLO %s\r\n", sx.helo_data) >= 0
3451 && smtp_read_response(&sx.inblock, sx.buffer, sizeof(sx.buffer),
3452 '2', sx.ob->command_timeout);
3454 if (sx.ok && continue_more)
3455 return yield; /* More addresses for another run */
3459 /* Set up a pipe for proxying TLS for the new transport process */
3461 smtp_peer_options |= OPTION_TLS;
3462 if (sx.ok = (socketpair(AF_UNIX, SOCK_STREAM, 0, pfd) == 0))
3465 set_errno(sx.first_addr, errno, US"internal allocation problem",
3467 # ifdef EXPERIMENTAL_DSN_INFO
3468 , sx.smtp_greeting, sx.helo_response
3475 return yield; /* More addresses for another run */
3477 /* If the socket is successfully passed, we mustn't send QUIT (or
3478 indeed anything!) from here. */
3480 /*XXX DSN_INFO: assume likely to do new HELO; but for greet we'll want to
3481 propagate it from the initial
3483 if (sx.ok && transport_pass_socket(tblock->name, host->name,
3484 host->address, new_message_id, socket_fd))
3486 sx.send_quit = FALSE;
3488 /* If TLS is still active, we need to proxy it for the transport we
3489 just passed the baton to. Fork a child to to do it, and return to
3490 get logging done asap. Which way to place the work makes assumptions
3491 about post-fork prioritisation which may not hold on all platforms. */
3493 if (tls_out.active >= 0)
3496 if (pid > 0) /* parent */
3498 DEBUG(D_transport) debug_printf("proxy-proc inter-pid %d\n", pid);
3500 waitpid(pid, NULL, 0);
3501 tls_close(FALSE, FALSE);
3502 (void)close(sx.inblock.sock);
3503 continue_transport = NULL;
3504 continue_hostname = NULL;
3507 else if (pid == 0) /* child; fork again to disconnect totally */
3512 DEBUG(D_transport) debug_printf("proxy-prox final-pid %d\n", pid);
3513 _exit(pid < 0 ? EXIT_FAILURE : EXIT_SUCCESS);
3515 smtp_proxy_tls(sx.buffer, sizeof(sx.buffer), pfd[0], sx.ob->command_timeout);
3516 exim_exit(0, US"TLS proxy");
3523 /* If RSET failed and there are addresses left, they get deferred. */
3525 set_errno(sx.first_addr, errno, msg, DEFER, FALSE, host
3526 #ifdef EXPERIMENTAL_DSN_INFO
3527 , sx.smtp_greeting, sx.helo_response
3533 /* End off tidily with QUIT unless the connection has died or the socket has
3534 been passed to another process. There has been discussion on the net about what
3535 to do after sending QUIT. The wording of the RFC suggests that it is necessary
3536 to wait for a response, but on the other hand, there isn't anything one can do
3537 with an error response, other than log it. Exim used to do that. However,
3538 further discussion suggested that it is positively advantageous not to wait for
3539 the response, but to close the session immediately. This is supposed to move
3540 the TCP/IP TIME_WAIT state from the server to the client, thereby removing some
3541 load from the server. (Hosts that are both servers and clients may not see much
3542 difference, of course.) Further discussion indicated that this was safe to do
3543 on Unix systems which have decent implementations of TCP/IP that leave the
3544 connection around for a while (TIME_WAIT) after the application has gone away.
3545 This enables the response sent by the server to be properly ACKed rather than
3546 timed out, as can happen on broken TCP/IP implementations on other OS.
3548 This change is being made on 31-Jul-98. After over a year of trouble-free
3549 operation, the old commented-out code was removed on 17-Sep-99. */
3552 if (sx.send_quit) (void)smtp_write_command(&sx.outblock, SCMD_FLUSH, "QUIT\r\n");
3557 tls_close(FALSE, TRUE);
3560 /* Close the socket, and return the appropriate value, first setting
3561 works because the NULL setting is passed back to the calling process, and
3562 remote_max_parallel is forced to 1 when delivering over an existing connection,
3564 If all went well and continue_more is set, we shouldn't actually get here if
3565 there are further addresses, as the return above will be taken. However,
3566 writing RSET might have failed, or there may be other addresses whose hosts are
3567 specified in the transports, and therefore not visible at top level, in which
3568 case continue_more won't get set. */
3570 HDEBUG(D_transport|D_acl|D_v) debug_printf_indent(" SMTP(close)>>\n");
3573 shutdown(sx.outblock.sock, SHUT_WR);
3574 if (fcntl(sx.inblock.sock, F_SETFL, O_NONBLOCK) == 0)
3575 for (rc = 16; read(sx.inblock.sock, sx.inbuffer, sizeof(sx.inbuffer)) > 0 && rc > 0;)
3576 rc--; /* drain socket */
3578 (void)close(sx.inblock.sock);
3580 #ifndef DISABLE_EVENT
3581 (void) event_raise(tblock->event_action, US"tcp:close", NULL);
3584 continue_transport = NULL;
3585 continue_hostname = NULL;
3592 /*************************************************
3593 * Closedown entry point *
3594 *************************************************/
3596 /* This function is called when exim is passed an open smtp channel
3597 from another incarnation, but the message which it has been asked
3598 to deliver no longer exists. The channel is on stdin.
3600 We might do fancy things like looking for another message to send down
3601 the channel, but if the one we sought has gone, it has probably been
3602 delivered by some other process that itself will seek further messages,
3603 so just close down our connection.
3605 Argument: pointer to the transport instance block
3610 smtp_transport_closedown(transport_instance *tblock)
3612 smtp_transport_options_block *ob =
3613 (smtp_transport_options_block *)tblock->options_block;
3614 smtp_inblock inblock;
3615 smtp_outblock outblock;
3617 uschar inbuffer[4096];
3618 uschar outbuffer[16];
3620 inblock.sock = fileno(stdin);
3621 inblock.buffer = inbuffer;
3622 inblock.buffersize = sizeof(inbuffer);
3623 inblock.ptr = inbuffer;
3624 inblock.ptrend = inbuffer;
3626 outblock.sock = inblock.sock;
3627 outblock.buffersize = sizeof(outbuffer);
3628 outblock.buffer = outbuffer;
3629 outblock.ptr = outbuffer;
3630 outblock.cmd_count = 0;
3631 outblock.authenticating = FALSE;
3633 (void)smtp_write_command(&outblock, SCMD_FLUSH, "QUIT\r\n");
3634 (void)smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
3635 ob->command_timeout);
3636 (void)close(inblock.sock);
3641 /*************************************************
3642 * Prepare addresses for delivery *
3643 *************************************************/
3645 /* This function is called to flush out error settings from previous delivery
3646 attempts to other hosts. It also records whether we got here via an MX record
3647 or not in the more_errno field of the address. We are interested only in
3648 addresses that are still marked DEFER - others may have got delivered to a
3649 previously considered IP address. Set their status to PENDING_DEFER to indicate
3650 which ones are relevant this time.
3653 addrlist the list of addresses
3654 host the host we are delivering to
3656 Returns: the first address for this delivery
3659 static address_item *
3660 prepare_addresses(address_item *addrlist, host_item *host)
3662 address_item *first_addr = NULL;
3664 for (addr = addrlist; addr; addr = addr->next)
3665 if (addr->transport_return == DEFER)
3667 if (!first_addr) first_addr = addr;
3668 addr->transport_return = PENDING_DEFER;
3669 addr->basic_errno = 0;
3670 addr->more_errno = (host->mx >= 0)? 'M' : 'A';
3671 addr->message = NULL;
3673 addr->cipher = NULL;
3674 addr->ourcert = NULL;
3675 addr->peercert = NULL;
3676 addr->peerdn = NULL;
3677 addr->ocsp = OCSP_NOT_REQ;
3679 #ifdef EXPERIMENTAL_DSN_INFO
3680 addr->smtp_greeting = NULL;
3681 addr->helo_response = NULL;
3689 /*************************************************
3690 * Main entry point *
3691 *************************************************/
3693 /* See local README for interface details. As this is a remote transport, it is
3694 given a chain of addresses to be delivered in one connection, if possible. It
3695 always returns TRUE, indicating that each address has its own independent
3696 status set, except if there is a setting up problem, in which case it returns
3700 smtp_transport_entry(
3701 transport_instance *tblock, /* data for this instantiation */
3702 address_item *addrlist) /* addresses we are working on */
3706 int hosts_defer = 0;
3708 int hosts_looked_up = 0;
3709 int hosts_retry = 0;
3710 int hosts_serial = 0;
3711 int hosts_total = 0;
3712 int total_hosts_tried = 0;
3714 BOOL expired = TRUE;
3715 uschar *expanded_hosts = NULL;
3717 uschar *tid = string_sprintf("%s transport", tblock->name);
3718 smtp_transport_options_block *ob =
3719 (smtp_transport_options_block *)(tblock->options_block);
3720 host_item *hostlist = addrlist->host_list;
3721 host_item *host = NULL;
3725 debug_printf("%s transport entered\n", tblock->name);
3726 for (addr = addrlist; addr; addr = addr->next)
3727 debug_printf(" %s\n", addr->address);
3730 debug_printf("hostlist:\n");
3731 for (host = hostlist; host; host = host->next)
3732 debug_printf(" %s:%d\n", host->name, host->port);
3734 if (continue_hostname)
3735 debug_printf("already connected to %s [%s] (on fd %d)\n",
3736 continue_hostname, continue_host_address,
3737 cutthrough.fd >= 0 ? cutthrough.fd : 0);
3740 /* Set the flag requesting that these hosts be added to the waiting
3741 database if the delivery fails temporarily or if we are running with
3742 queue_smtp or a 2-stage queue run. This gets unset for certain
3743 kinds of error, typically those that are specific to the message. */
3745 update_waiting = TRUE;
3747 /* If a host list is not defined for the addresses - they must all have the
3748 same one in order to be passed to a single transport - or if the transport has
3749 a host list with hosts_override set, use the host list supplied with the
3750 transport. It is an error for this not to exist. */
3752 if (!hostlist || (ob->hosts_override && ob->hosts))
3756 addrlist->message = string_sprintf("%s transport called with no hosts set",
3758 addrlist->transport_return = PANIC;
3759 return FALSE; /* Only top address has status */
3762 DEBUG(D_transport) debug_printf("using the transport's hosts: %s\n",
3765 /* If the transport's host list contains no '$' characters, and we are not
3766 randomizing, it is fixed and therefore a chain of hosts can be built once
3767 and for all, and remembered for subsequent use by other calls to this
3768 transport. If, on the other hand, the host list does contain '$', or we are
3769 randomizing its order, we have to rebuild it each time. In the fixed case,
3770 as the hosts string will never be used again, it doesn't matter that we
3771 replace all the : characters with zeros. */
3775 uschar *s = ob->hosts;
3777 if (Ustrchr(s, '$') != NULL)
3779 if (!(expanded_hosts = expand_string(s)))
3781 addrlist->message = string_sprintf("failed to expand list of hosts "
3782 "\"%s\" in %s transport: %s", s, tblock->name, expand_string_message);
3783 addrlist->transport_return = search_find_defer ? DEFER : PANIC;
3784 return FALSE; /* Only top address has status */
3786 DEBUG(D_transport) debug_printf("expanded list of hosts \"%s\" to "
3787 "\"%s\"\n", s, expanded_hosts);
3791 if (ob->hosts_randomize) s = expanded_hosts = string_copy(s);
3793 host_build_hostlist(&hostlist, s, ob->hosts_randomize);
3795 /* Check that the expansion yielded something useful. */
3799 string_sprintf("%s transport has empty hosts setting", tblock->name);
3800 addrlist->transport_return = PANIC;
3801 return FALSE; /* Only top address has status */
3804 /* If there was no expansion of hosts, save the host list for
3807 if (!expanded_hosts) ob->hostlist = hostlist;
3810 /* This is not the first time this transport has been run in this delivery;
3811 the host list was built previously. */
3814 hostlist = ob->hostlist;
3817 /* The host list was supplied with the address. If hosts_randomize is set, we
3818 must sort it into a random order if it did not come from MX records and has not
3819 already been randomized (but don't bother if continuing down an existing
3822 else if (ob->hosts_randomize && hostlist->mx == MX_NONE && !continue_hostname)
3824 host_item *newlist = NULL;
3827 host_item *h = hostlist;
3828 hostlist = hostlist->next;
3830 h->sort_key = random_number(100);
3837 else if (h->sort_key < newlist->sort_key)
3844 host_item *hh = newlist;
3847 if (h->sort_key < hh->next->sort_key) break;
3855 hostlist = addrlist->host_list = newlist;
3858 /* Sort out the default port. */
3860 if (!smtp_get_port(ob->port, addrlist, &defport, tid)) return FALSE;
3862 /* For each host-plus-IP-address on the list:
3864 . If this is a continued delivery and the host isn't the one with the
3865 current connection, skip.
3867 . If the status is unusable (i.e. previously failed or retry checked), skip.
3869 . If no IP address set, get the address, either by turning the name into
3870 an address, calling gethostbyname if gethostbyname is on, or by calling
3871 the DNS. The DNS may yield multiple addresses, in which case insert the
3872 extra ones into the list.
3874 . Get the retry data if not previously obtained for this address and set the
3875 field which remembers the state of this address. Skip if the retry time is
3876 not reached. If not, remember whether retry data was found. The retry string
3877 contains both the name and the IP address.
3879 . Scan the list of addresses and mark those whose status is DEFER as
3880 PENDING_DEFER. These are the only ones that will be processed in this cycle
3883 . Make a delivery attempt - addresses marked PENDING_DEFER will be tried.
3884 Some addresses may be successfully delivered, others may fail, and yet
3885 others may get temporary errors and so get marked DEFER.
3887 . The return from the delivery attempt is OK if a connection was made and a
3888 valid SMTP dialogue was completed. Otherwise it is DEFER.
3890 . If OK, add a "remove" retry item for this host/IPaddress, if any.
3892 . If fail to connect, or other defer state, add a retry item.
3894 . If there are any addresses whose status is still DEFER, carry on to the
3895 next host/IPaddress, unless we have tried the number of hosts given
3896 by hosts_max_try or hosts_max_try_hardlimit; otherwise return. Note that
3897 there is some fancy logic for hosts_max_try that means its limit can be
3898 overstepped in some circumstances.
3900 If we get to the end of the list, all hosts have deferred at least one address,
3901 or not reached their retry times. If delay_after_cutoff is unset, it requests a
3902 delivery attempt to those hosts whose last try was before the arrival time of
3903 the current message. To cope with this, we have to go round the loop a second
3904 time. After that, set the status and error data for any addresses that haven't
3905 had it set already. */
3907 for (cutoff_retry = 0;
3908 expired && cutoff_retry < (ob->delay_after_cutoff ? 1 : 2);
3911 host_item *nexthost = NULL;
3912 int unexpired_hosts_tried = 0;
3914 for (host = hostlist;
3916 && unexpired_hosts_tried < ob->hosts_max_try
3917 && total_hosts_tried < ob->hosts_max_try_hardlimit;
3923 BOOL host_is_expired = FALSE;
3924 BOOL message_defer = FALSE;
3925 BOOL some_deferred = FALSE;
3926 address_item *first_addr = NULL;
3927 uschar *interface = NULL;
3928 uschar *retry_host_key = NULL;
3929 uschar *retry_message_key = NULL;
3930 uschar *serialize_key = NULL;
3932 /* Default next host is next host. :-) But this can vary if the
3933 hosts_max_try limit is hit (see below). It may also be reset if a host
3934 address is looked up here (in case the host was multihomed). */
3936 nexthost = host->next;
3938 /* If the address hasn't yet been obtained from the host name, look it up
3939 now, unless the host is already marked as unusable. If it is marked as
3940 unusable, it means that the router was unable to find its IP address (in
3941 the DNS or wherever) OR we are in the 2nd time round the cutoff loop, and
3942 the lookup failed last time. We don't get this far if *all* MX records
3943 point to non-existent hosts; that is treated as a hard error.
3945 We can just skip this host entirely. When the hosts came from the router,
3946 the address will timeout based on the other host(s); when the address is
3947 looked up below, there is an explicit retry record added.
3949 Note that we mustn't skip unusable hosts if the address is not unset; they
3950 may be needed as expired hosts on the 2nd time round the cutoff loop. */
3954 int new_port, flags;
3957 if (host->status >= hstatus_unusable)
3959 DEBUG(D_transport) debug_printf("%s has no address and is unusable - skipping\n",
3964 DEBUG(D_transport) debug_printf("getting address for %s\n", host->name);
3966 /* The host name is permitted to have an attached port. Find it, and
3967 strip it from the name. Just remember it for now. */
3969 new_port = host_item_get_port(host);
3971 /* Count hosts looked up */
3975 /* Find by name if so configured, or if it's an IP address. We don't
3976 just copy the IP address, because we need the test-for-local to happen. */
3978 flags = HOST_FIND_BY_A;
3979 if (ob->dns_qualify_single) flags |= HOST_FIND_QUALIFY_SINGLE;
3980 if (ob->dns_search_parents) flags |= HOST_FIND_SEARCH_PARENTS;
3982 if (ob->gethostbyname || string_is_ip_address(host->name, NULL) != 0)
3983 rc = host_find_byname(host, NULL, flags, NULL, TRUE);
3985 rc = host_find_bydns(host, NULL, flags, NULL, NULL, NULL,
3986 &ob->dnssec, /* domains for request/require */
3989 /* Update the host (and any additional blocks, resulting from
3990 multihoming) with a host-specific port, if any. */
3992 for (hh = host; hh != nexthost; hh = hh->next) hh->port = new_port;
3994 /* Failure to find the host at this time (usually DNS temporary failure)
3995 is really a kind of routing failure rather than a transport failure.
3996 Therefore we add a retry item of the routing kind, not to stop us trying
3997 to look this name up here again, but to ensure the address gets timed
3998 out if the failures go on long enough. A complete failure at this point
3999 commonly points to a configuration error, but the best action is still
4000 to carry on for the next host. */
4002 if (rc == HOST_FIND_AGAIN || rc == HOST_FIND_SECURITY || rc == HOST_FIND_FAILED)
4004 retry_add_item(addrlist, string_sprintf("R:%s", host->name), 0);
4006 if (rc == HOST_FIND_AGAIN) hosts_defer++; else hosts_fail++;
4007 DEBUG(D_transport) debug_printf("rc = %s for %s\n", (rc == HOST_FIND_AGAIN)?
4008 "HOST_FIND_AGAIN" : "HOST_FIND_FAILED", host->name);
4009 host->status = hstatus_unusable;
4011 for (addr = addrlist; addr; addr = addr->next)
4013 if (addr->transport_return != DEFER) continue;
4014 addr->basic_errno = ERRNO_UNKNOWNHOST;
4015 addr->message = string_sprintf(
4016 rc == HOST_FIND_SECURITY
4017 ? "lookup of IP address for %s was insecure"
4018 : "failed to lookup IP address for %s",
4024 /* If the host is actually the local host, we may have a problem, or
4025 there may be some cunning configuration going on. In the problem case,
4026 log things and give up. The default transport status is already DEFER. */
4028 if (rc == HOST_FOUND_LOCAL && !ob->allow_localhost)
4030 for (addr = addrlist; addr; addr = addr->next)
4032 addr->basic_errno = 0;
4033 addr->message = string_sprintf("%s transport found host %s to be "
4034 "local", tblock->name, host->name);
4038 } /* End of block for IP address lookup */
4040 /* If this is a continued delivery, we are interested only in the host
4041 which matches the name of the existing open channel. The check is put
4042 here after the local host lookup, in case the name gets expanded as a
4043 result of the lookup. Set expired FALSE, to save the outer loop executing
4046 if ( continue_hostname
4047 && ( Ustrcmp(continue_hostname, host->name) != 0
4048 || Ustrcmp(continue_host_address, host->address) != 0
4052 continue; /* With next host */
4055 /* Reset the default next host in case a multihomed host whose addresses
4056 are not looked up till just above added to the host list. */
4058 nexthost = host->next;
4060 /* If queue_smtp is set (-odqs or the first part of a 2-stage run), or the
4061 domain is in queue_smtp_domains, we don't actually want to attempt any
4062 deliveries. When doing a queue run, queue_smtp_domains is always unset. If
4063 there is a lookup defer in queue_smtp_domains, proceed as if the domain
4064 were not in it. We don't want to hold up all SMTP deliveries! Except when
4065 doing a two-stage queue run, don't do this if forcing. */
4067 if ((!deliver_force || queue_2stage) && (queue_smtp ||
4068 match_isinlist(addrlist->domain,
4069 (const uschar **)&queue_smtp_domains, 0,
4070 &domainlist_anchor, NULL, MCL_DOMAIN, TRUE, NULL) == OK))
4073 for (addr = addrlist; addr; addr = addr->next)
4074 if (addr->transport_return == DEFER)
4075 addr->message = US"domain matches queue_smtp_domains, or -odqs set";
4076 continue; /* With next host */
4079 /* Count hosts being considered - purely for an intelligent comment
4080 if none are usable. */
4084 /* Set $host and $host address now in case they are needed for the
4085 interface expansion or the serialize_hosts check; they remain set if an
4086 actual delivery happens. */
4088 deliver_host = host->name;
4089 deliver_host_address = host->address;
4090 lookup_dnssec_authenticated = host->dnssec == DS_YES ? US"yes"
4091 : host->dnssec == DS_NO ? US"no"
4094 /* Set up a string for adding to the retry key if the port number is not
4095 the standard SMTP port. A host may have its own port setting that overrides
4098 pistring = string_sprintf(":%d", host->port == PORT_NONE
4099 ? defport : host->port);
4100 if (Ustrcmp(pistring, ":25") == 0) pistring = US"";
4102 /* Select IPv4 or IPv6, and choose an outgoing interface. If the interface
4103 string is set, even if constant (as different transports can have different
4104 constant settings), we must add it to the key that is used for retries,
4105 because connections to the same host from a different interface should be
4106 treated separately. */
4108 host_af = Ustrchr(host->address, ':') == NULL ? AF_INET : AF_INET6;
4109 if ((rs = ob->interface) && *rs)
4111 if (!smtp_get_interface(rs, host_af, addrlist, &interface, tid))
4113 pistring = string_sprintf("%s/%s", pistring, interface);
4116 /* The first time round the outer loop, check the status of the host by
4117 inspecting the retry data. The second time round, we are interested only
4118 in expired hosts that haven't been tried since this message arrived. */
4120 if (cutoff_retry == 0)
4123 /* Ensure the status of the address is set by checking retry data if
4124 necessary. There may be host-specific retry data (applicable to all
4125 messages) and also data for retries of a specific message at this host.
4126 If either of these retry records are actually read, the keys used are
4127 returned to save recomputing them later. */
4129 if (exp_bool(addrlist, US"transport", tblock->name, D_transport,
4130 US"retry_include_ip_address", ob->retry_include_ip_address,
4131 ob->expand_retry_include_ip_address, &incl_ip) != OK)
4132 continue; /* with next host */
4134 host_is_expired = retry_check_address(addrlist->domain, host, pistring,
4135 incl_ip, &retry_host_key, &retry_message_key);
4137 DEBUG(D_transport) debug_printf("%s [%s]%s retry-status = %s\n", host->name,
4138 (host->address == NULL)? US"" : host->address, pistring,
4139 (host->status == hstatus_usable)? "usable" :
4140 (host->status == hstatus_unusable)? "unusable" :
4141 (host->status == hstatus_unusable_expired)? "unusable (expired)" : "?");
4143 /* Skip this address if not usable at this time, noting if it wasn't
4144 actually expired, both locally and in the address. */
4146 switch (host->status)
4148 case hstatus_unusable:
4150 setflag(addrlist, af_retry_skipped);
4153 case hstatus_unusable_expired:
4156 case hwhy_retry: hosts_retry++; break;
4157 case hwhy_failed: hosts_fail++; break;
4159 case hwhy_deferred: hosts_defer++; break;
4162 /* If there was a retry message key, implying that previously there
4163 was a message-specific defer, we don't want to update the list of
4164 messages waiting for these hosts. */
4166 if (retry_message_key) update_waiting = FALSE;
4167 continue; /* With the next host or IP address */
4171 /* Second time round the loop: if the address is set but expired, and
4172 the message is newer than the last try, let it through. */
4177 || host->status != hstatus_unusable_expired
4178 || host->last_try > received_time.tv_sec)
4180 DEBUG(D_transport) debug_printf("trying expired host %s [%s]%s\n",
4181 host->name, host->address, pistring);
4182 host_is_expired = TRUE;
4185 /* Setting "expired=FALSE" doesn't actually mean not all hosts are expired;
4186 it remains TRUE only if all hosts are expired and none are actually tried.
4191 /* If this host is listed as one to which access must be serialized,
4192 see if another Exim process has a connection to it, and if so, skip
4193 this host. If not, update the database to record our connection to it
4194 and remember this for later deletion. Do not do any of this if we are
4195 sending the message down a pre-existing connection. */
4197 if ( !continue_hostname
4198 && verify_check_given_host(&ob->serialize_hosts, host) == OK)
4200 serialize_key = string_sprintf("host-serialize-%s", host->name);
4201 if (!enq_start(serialize_key, 1))
4204 debug_printf("skipping host %s because another Exim process "
4205 "is connected to it\n", host->name);
4211 /* OK, we have an IP address that is not waiting for its retry time to
4212 arrive (it might be expired) OR (second time round the loop) we have an
4213 expired host that hasn't been tried since the message arrived. Have a go
4214 at delivering the message to it. First prepare the addresses by flushing
4215 out the result of previous attempts, and finding the first address that
4216 is still to be delivered. */
4218 first_addr = prepare_addresses(addrlist, host);
4220 DEBUG(D_transport) debug_printf("delivering %s to %s [%s] (%s%s)\n",
4221 message_id, host->name, host->address, addrlist->address,
4222 addrlist->next ? ", ..." : "");
4224 set_process_info("delivering %s to %s [%s] (%s%s)",
4225 message_id, host->name, host->address, addrlist->address,
4226 addrlist->next ? ", ..." : "");
4228 /* This is not for real; don't do the delivery. If there are
4229 any remaining hosts, list them. */
4234 set_errno_nohost(addrlist, 0, NULL, OK, FALSE);
4235 for (addr = addrlist; addr; addr = addr->next)
4237 addr->host_used = host;
4238 addr->special_action = '*';
4239 addr->message = US"delivery bypassed by -N option";
4243 debug_printf("*** delivery by %s transport bypassed by -N option\n"
4244 "*** host and remaining hosts:\n", tblock->name);
4245 for (host2 = host; host2; host2 = host2->next)
4246 debug_printf(" %s [%s]\n", host2->name,
4247 host2->address ? host2->address : US"unset");
4252 /* This is for real. If the host is expired, we don't count it for
4253 hosts_max_retry. This ensures that all hosts must expire before an address
4254 is timed out, unless hosts_max_try_hardlimit (which protects against
4255 lunatic DNS configurations) is reached.
4257 If the host is not expired and we are about to hit the hosts_max_retry
4258 limit, check to see if there is a subsequent hosts with a different MX
4259 value. If so, make that the next host, and don't count this one. This is a
4260 heuristic to make sure that different MXs do get tried. With a normal kind
4261 of retry rule, they would get tried anyway when the earlier hosts were
4262 delayed, but if the domain has a "retry every time" type of rule - as is
4263 often used for the the very large ISPs, that won't happen. */
4268 /* Make a copy of the host if it is local to this invocation
4269 of the transport. */
4273 thost = store_get(sizeof(host_item));
4275 thost->name = string_copy(host->name);
4276 thost->address = string_copy(host->address);
4281 if (!host_is_expired && ++unexpired_hosts_tried >= ob->hosts_max_try)
4285 debug_printf("hosts_max_try limit reached with this host\n");
4286 for (h = host; h; h = h->next) if (h->mx != host->mx)
4289 unexpired_hosts_tried--;
4290 DEBUG(D_transport) debug_printf("however, a higher MX host exists "
4291 "and will be tried\n");
4296 /* Attempt the delivery. */
4298 total_hosts_tried++;
4299 rc = smtp_deliver(addrlist, thost, host_af, defport, interface, tblock,
4300 &message_defer, FALSE);
4303 OK => connection made, each address contains its result;
4304 message_defer is set for message-specific defers (when all
4305 recipients are marked defer)
4306 DEFER => there was a non-message-specific delivery problem;
4307 ERROR => there was a problem setting up the arguments for a filter,
4308 or there was a problem with expanding added headers
4311 /* If the result is not OK, there was a non-message-specific problem.
4312 If the result is DEFER, we need to write to the logs saying what happened
4313 for this particular host, except in the case of authentication and TLS
4314 failures, where the log has already been written. If all hosts defer a
4315 general message is written at the end. */
4317 if (rc == DEFER && first_addr->basic_errno != ERRNO_AUTHFAIL
4318 && first_addr->basic_errno != ERRNO_TLSFAILURE)
4319 write_logs(first_addr, host);
4321 #ifndef DISABLE_EVENT
4323 deferred_event_raise(first_addr, host);
4326 /* If STARTTLS was accepted, but there was a failure in setting up the
4327 TLS session (usually a certificate screwup), and the host is not in
4328 hosts_require_tls, and tls_tempfail_tryclear is true, try again, with
4329 TLS forcibly turned off. We have to start from scratch with a new SMTP
4330 connection. That's why the retry is done from here, not from within
4331 smtp_deliver(). [Rejections of STARTTLS itself don't screw up the
4332 session, so the in-clear transmission after those errors, if permitted,
4333 happens inside smtp_deliver().] */
4337 && first_addr->basic_errno == ERRNO_TLSFAILURE
4338 && ob->tls_tempfail_tryclear
4339 && verify_check_given_host(&ob->hosts_require_tls, host) != OK
4342 log_write(0, LOG_MAIN,
4343 "%s: delivering unencrypted to H=%s [%s] (not in hosts_require_tls)",
4344 first_addr->message, host->name, host->address);
4345 first_addr = prepare_addresses(addrlist, host);
4346 rc = smtp_deliver(addrlist, thost, host_af, defport, interface, tblock,
4347 &message_defer, TRUE);
4348 if (rc == DEFER && first_addr->basic_errno != ERRNO_AUTHFAIL)
4349 write_logs(first_addr, host);
4350 # ifndef DISABLE_EVENT
4352 deferred_event_raise(first_addr, host);
4355 #endif /*SUPPORT_TLS*/
4358 /* Delivery attempt finished */
4360 rs = rc == OK ? US"OK"
4361 : rc == DEFER ? US"DEFER"
4362 : rc == ERROR ? US"ERROR"
4365 set_process_info("delivering %s: just tried %s [%s] for %s%s: result %s",
4366 message_id, host->name, host->address, addrlist->address,
4367 addrlist->next ? " (& others)" : "", rs);
4369 /* Release serialization if set up */
4371 if (serialize_key) enq_end(serialize_key);
4373 /* If the result is DEFER, or if a host retry record is known to exist, we
4374 need to add an item to the retry chain for updating the retry database
4375 at the end of delivery. We only need to add the item to the top address,
4376 of course. Also, if DEFER, we mark the IP address unusable so as to skip it
4377 for any other delivery attempts using the same address. (It is copied into
4378 the unusable tree at the outer level, so even if different address blocks
4379 contain the same address, it still won't get tried again.) */
4381 if (rc == DEFER || retry_host_key)
4383 int delete_flag = rc != DEFER ? rf_delete : 0;
4384 if (!retry_host_key)
4387 if (exp_bool(addrlist, US"transport", tblock->name, D_transport,
4388 US"retry_include_ip_address", ob->retry_include_ip_address,
4389 ob->expand_retry_include_ip_address, &incl_ip) != OK)
4390 incl_ip = TRUE; /* error; use most-specific retry record */
4392 retry_host_key = incl_ip
4393 ? string_sprintf("T:%S:%s%s", host->name, host->address, pistring)
4394 : string_sprintf("T:%S%s", host->name, pistring);
4397 /* If a delivery of another message over an existing SMTP connection
4398 yields DEFER, we do NOT set up retry data for the host. This covers the
4399 case when there are delays in routing the addresses in the second message
4400 that are so long that the server times out. This is alleviated by not
4401 routing addresses that previously had routing defers when handling an
4402 existing connection, but even so, this case may occur (e.g. if a
4403 previously happily routed address starts giving routing defers). If the
4404 host is genuinely down, another non-continued message delivery will
4405 notice it soon enough. */
4407 if (delete_flag != 0 || !continue_hostname)
4408 retry_add_item(first_addr, retry_host_key, rf_host | delete_flag);
4410 /* We may have tried an expired host, if its retry time has come; ensure
4411 the status reflects the expiry for the benefit of any other addresses. */
4415 host->status = host_is_expired
4416 ? hstatus_unusable_expired : hstatus_unusable;
4417 host->why = hwhy_deferred;
4421 /* If message_defer is set (host was OK, but every recipient got deferred
4422 because of some message-specific problem), or if that had happened
4423 previously so that a message retry key exists, add an appropriate item
4424 to the retry chain. Note that if there was a message defer but now there is
4425 a host defer, the message defer record gets deleted. That seems perfectly
4426 reasonable. Also, stop the message from being remembered as waiting
4427 for specific hosts. */
4429 if (message_defer || retry_message_key)
4431 int delete_flag = message_defer ? 0 : rf_delete;
4432 if (!retry_message_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_message_key = incl_ip
4441 ? string_sprintf("T:%S:%s%s:%s", host->name, host->address, pistring,
4443 : string_sprintf("T:%S%s:%s", host->name, pistring, message_id);
4445 retry_add_item(addrlist, retry_message_key,
4446 rf_message | rf_host | delete_flag);
4447 update_waiting = FALSE;
4450 /* Any return other than DEFER (that is, OK or ERROR) means that the
4451 addresses have got their final statuses filled in for this host. In the OK
4452 case, see if any of them are deferred. */
4455 for (addr = addrlist; addr; addr = addr->next)
4456 if (addr->transport_return == DEFER)
4458 some_deferred = TRUE;
4462 /* If no addresses deferred or the result was ERROR, return. We do this for
4463 ERROR because a failing filter set-up or add_headers expansion is likely to
4464 fail for any host we try. */
4466 if (rc == ERROR || (rc == OK && !some_deferred))
4468 DEBUG(D_transport) debug_printf("Leaving %s transport\n", tblock->name);
4469 return TRUE; /* Each address has its status */
4472 /* If the result was DEFER or some individual addresses deferred, let
4473 the loop run to try other hosts with the deferred addresses, except for the
4474 case when we were trying to deliver down an existing channel and failed.
4475 Don't try any other hosts in this case. */
4477 if (continue_hostname) break;
4479 /* If the whole delivery, or some individual addresses, were deferred and
4480 there are more hosts that could be tried, do not count this host towards
4481 the hosts_max_try limit if the age of the message is greater than the
4482 maximum retry time for this host. This means we may try try all hosts,
4483 ignoring the limit, when messages have been around for some time. This is
4484 important because if we don't try all hosts, the address will never time
4485 out. NOTE: this does not apply to hosts_max_try_hardlimit. */
4487 if ((rc == DEFER || some_deferred) && nexthost)
4490 retry_config *retry = retry_find_config(host->name, NULL, 0, 0);
4492 if (retry && retry->rules)
4494 retry_rule *last_rule;
4495 for (last_rule = retry->rules;
4497 last_rule = last_rule->next);
4498 timedout = time(NULL) - received_time.tv_sec > last_rule->timeout;
4500 else timedout = TRUE; /* No rule => timed out */
4504 unexpired_hosts_tried--;
4505 DEBUG(D_transport) debug_printf("temporary delivery error(s) override "
4506 "hosts_max_try (message older than host's retry time)\n");
4509 } /* End of loop for trying multiple hosts. */
4511 /* This is the end of the loop that repeats iff expired is TRUE and
4512 ob->delay_after_cutoff is FALSE. The second time round we will
4513 try those hosts that haven't been tried since the message arrived. */
4517 debug_printf("all IP addresses skipped or deferred at least one address\n");
4518 if (expired && !ob->delay_after_cutoff && cutoff_retry == 0)
4519 debug_printf("retrying IP addresses not tried since message arrived\n");
4524 /* Get here if all IP addresses are skipped or defer at least one address. In
4525 MUA wrapper mode, this will happen only for connection or other non-message-
4526 specific failures. Force the delivery status for all addresses to FAIL. */
4530 for (addr = addrlist; addr; addr = addr->next)
4531 addr->transport_return = FAIL;
4535 /* In the normal, non-wrapper case, add a standard message to each deferred
4536 address if there hasn't been an error, that is, if it hasn't actually been
4537 tried this time. The variable "expired" will be FALSE if any deliveries were
4538 actually tried, or if there was at least one host that was not expired. That
4539 is, it is TRUE only if no deliveries were tried and all hosts were expired. If
4540 a delivery has been tried, an error code will be set, and the failing of the
4541 message is handled by the retry code later.
4543 If queue_smtp is set, or this transport was called to send a subsequent message
4544 down an existing TCP/IP connection, and something caused the host not to be
4545 found, we end up here, but can detect these cases and handle them specially. */
4547 for (addr = addrlist; addr; addr = addr->next)
4549 /* If host is not NULL, it means that we stopped processing the host list
4550 because of hosts_max_try or hosts_max_try_hardlimit. In the former case, this
4551 means we need to behave as if some hosts were skipped because their retry
4552 time had not come. Specifically, this prevents the address from timing out.
4553 However, if we have hit hosts_max_try_hardlimit, we want to behave as if all
4554 hosts were tried. */
4557 if (total_hosts_tried >= ob->hosts_max_try_hardlimit)
4560 debug_printf("hosts_max_try_hardlimit reached: behave as if all "
4561 "hosts were tried\n");
4566 debug_printf("hosts_max_try limit caused some hosts to be skipped\n");
4567 setflag(addr, af_retry_skipped);
4570 if (queue_smtp) /* no deliveries attempted */
4572 addr->transport_return = DEFER;
4573 addr->basic_errno = 0;
4574 addr->message = US"SMTP delivery explicitly queued";
4577 else if ( addr->transport_return == DEFER
4578 && (addr->basic_errno == ERRNO_UNKNOWNERROR || addr->basic_errno == 0)
4582 addr->basic_errno = ERRNO_HRETRY;
4583 if (continue_hostname)
4584 addr->message = US"no host found for existing SMTP connection";
4587 setflag(addr, af_pass_message); /* This is not a security risk */
4588 addr->message = string_sprintf(
4589 "all hosts%s have been failing for a long time %s",
4590 addr->domain ? string_sprintf(" for '%s'", addr->domain) : US"",
4591 ob->delay_after_cutoff
4592 ? US"(and retry time not reached)"
4593 : US"and were last tried after this message arrived");
4595 /* If we are already using fallback hosts, or there are no fallback hosts
4596 defined, convert the result to FAIL to cause a bounce. */
4598 if (addr->host_list == addr->fallback_hosts || !addr->fallback_hosts)
4599 addr->transport_return = FAIL;
4604 if (hosts_retry == hosts_total)
4605 s = "retry time not reached for any host%s";
4606 else if (hosts_fail == hosts_total)
4607 s = "all host address lookups%s failed permanently";
4608 else if (hosts_defer == hosts_total)
4609 s = "all host address lookups%s failed temporarily";
4610 else if (hosts_serial == hosts_total)
4611 s = "connection limit reached for all hosts%s";
4612 else if (hosts_fail+hosts_defer == hosts_total)
4613 s = "all host address lookups%s failed";
4615 s = "some host address lookups failed and retry time "
4616 "not reached for other hosts or connection limit reached%s";
4618 addr->message = string_sprintf(s,
4619 addr->domain ? string_sprintf(" for '%s'", addr->domain) : US"");
4624 /* Update the database which keeps information about which messages are waiting
4625 for which hosts to become available. For some message-specific errors, the
4626 update_waiting flag is turned off because we don't want follow-on deliveries in
4627 those cases. If this transport instance is explicitly limited to one message
4628 per connection then follow-on deliveries are not possible and there's no need
4629 to create/update the per-transport wait-<transport_name> database. */
4631 if (update_waiting && tblock->connection_max_messages != 1)
4632 transport_update_waiting(hostlist, tblock->name);
4636 DEBUG(D_transport) debug_printf("Leaving %s transport\n", tblock->name);
4638 return TRUE; /* Each address has its status */
4641 #endif /*!MACRO_PREDEF*/
4644 /* End of transport/smtp.c */