1 /*************************************************
2 * Exim - an Internet mail transport agent *
3 *************************************************/
5 /* Copyright (c) University of Cambridge 1995 - 2017 */
6 /* See the file NOTICE for conditions of use and distribution. */
12 /* Options specific to the smtp transport. This transport also supports LMTP
13 over TCP/IP. The options must be in alphabetic order (note that "_" comes
14 before the lower case letters). Some live in the transport_instance block so as
15 to be publicly visible; these are flagged with opt_public. */
17 optionlist smtp_transport_options[] = {
18 { "*expand_multi_domain", opt_stringptr | opt_hidden | opt_public,
19 (void *)offsetof(transport_instance, expand_multi_domain) },
20 { "*expand_retry_include_ip_address", opt_stringptr | opt_hidden,
21 (void *)(offsetof(smtp_transport_options_block, expand_retry_include_ip_address)) },
23 { "address_retry_include_sender", opt_bool,
24 (void *)offsetof(smtp_transport_options_block, address_retry_include_sender) },
25 { "allow_localhost", opt_bool,
26 (void *)offsetof(smtp_transport_options_block, allow_localhost) },
27 { "authenticated_sender", opt_stringptr,
28 (void *)offsetof(smtp_transport_options_block, authenticated_sender) },
29 { "authenticated_sender_force", opt_bool,
30 (void *)offsetof(smtp_transport_options_block, authenticated_sender_force) },
31 { "command_timeout", opt_time,
32 (void *)offsetof(smtp_transport_options_block, command_timeout) },
33 { "connect_timeout", opt_time,
34 (void *)offsetof(smtp_transport_options_block, connect_timeout) },
35 { "connection_max_messages", opt_int | opt_public,
36 (void *)offsetof(transport_instance, connection_max_messages) },
37 { "data_timeout", opt_time,
38 (void *)offsetof(smtp_transport_options_block, data_timeout) },
39 { "delay_after_cutoff", opt_bool,
40 (void *)offsetof(smtp_transport_options_block, delay_after_cutoff) },
42 { "dkim_canon", opt_stringptr,
43 (void *)offsetof(smtp_transport_options_block, dkim.dkim_canon) },
44 { "dkim_domain", opt_stringptr,
45 (void *)offsetof(smtp_transport_options_block, dkim.dkim_domain) },
46 { "dkim_private_key", opt_stringptr,
47 (void *)offsetof(smtp_transport_options_block, dkim.dkim_private_key) },
48 { "dkim_selector", opt_stringptr,
49 (void *)offsetof(smtp_transport_options_block, dkim.dkim_selector) },
50 { "dkim_sign_headers", opt_stringptr,
51 (void *)offsetof(smtp_transport_options_block, dkim.dkim_sign_headers) },
52 { "dkim_strict", opt_stringptr,
53 (void *)offsetof(smtp_transport_options_block, dkim.dkim_strict) },
55 { "dns_qualify_single", opt_bool,
56 (void *)offsetof(smtp_transport_options_block, dns_qualify_single) },
57 { "dns_search_parents", opt_bool,
58 (void *)offsetof(smtp_transport_options_block, dns_search_parents) },
59 { "dnssec_request_domains", opt_stringptr,
60 (void *)offsetof(smtp_transport_options_block, dnssec.request) },
61 { "dnssec_require_domains", opt_stringptr,
62 (void *)offsetof(smtp_transport_options_block, dnssec.require) },
63 { "dscp", opt_stringptr,
64 (void *)offsetof(smtp_transport_options_block, dscp) },
65 { "fallback_hosts", opt_stringptr,
66 (void *)offsetof(smtp_transport_options_block, fallback_hosts) },
67 { "final_timeout", opt_time,
68 (void *)offsetof(smtp_transport_options_block, final_timeout) },
69 { "gethostbyname", opt_bool,
70 (void *)offsetof(smtp_transport_options_block, gethostbyname) },
71 { "helo_data", opt_stringptr,
72 (void *)offsetof(smtp_transport_options_block, helo_data) },
73 { "hosts", opt_stringptr,
74 (void *)offsetof(smtp_transport_options_block, hosts) },
75 { "hosts_avoid_esmtp", opt_stringptr,
76 (void *)offsetof(smtp_transport_options_block, hosts_avoid_esmtp) },
77 { "hosts_avoid_pipelining", opt_stringptr,
78 (void *)offsetof(smtp_transport_options_block, hosts_avoid_pipelining) },
80 { "hosts_avoid_tls", opt_stringptr,
81 (void *)offsetof(smtp_transport_options_block, hosts_avoid_tls) },
83 { "hosts_max_try", opt_int,
84 (void *)offsetof(smtp_transport_options_block, hosts_max_try) },
85 { "hosts_max_try_hardlimit", opt_int,
86 (void *)offsetof(smtp_transport_options_block, hosts_max_try_hardlimit) },
88 { "hosts_nopass_tls", opt_stringptr,
89 (void *)offsetof(smtp_transport_options_block, hosts_nopass_tls) },
91 { "hosts_override", opt_bool,
92 (void *)offsetof(smtp_transport_options_block, hosts_override) },
93 { "hosts_randomize", opt_bool,
94 (void *)offsetof(smtp_transport_options_block, hosts_randomize) },
95 #if defined(SUPPORT_TLS) && !defined(DISABLE_OCSP)
96 { "hosts_request_ocsp", opt_stringptr,
97 (void *)offsetof(smtp_transport_options_block, hosts_request_ocsp) },
99 { "hosts_require_auth", opt_stringptr,
100 (void *)offsetof(smtp_transport_options_block, hosts_require_auth) },
102 # ifdef EXPERIMENTAL_DANE
103 { "hosts_require_dane", opt_stringptr,
104 (void *)offsetof(smtp_transport_options_block, hosts_require_dane) },
106 # ifndef DISABLE_OCSP
107 { "hosts_require_ocsp", opt_stringptr,
108 (void *)offsetof(smtp_transport_options_block, hosts_require_ocsp) },
110 { "hosts_require_tls", opt_stringptr,
111 (void *)offsetof(smtp_transport_options_block, hosts_require_tls) },
113 { "hosts_try_auth", opt_stringptr,
114 (void *)offsetof(smtp_transport_options_block, hosts_try_auth) },
115 { "hosts_try_chunking", opt_stringptr,
116 (void *)offsetof(smtp_transport_options_block, hosts_try_chunking) },
117 #if defined(SUPPORT_TLS) && defined(EXPERIMENTAL_DANE)
118 { "hosts_try_dane", opt_stringptr,
119 (void *)offsetof(smtp_transport_options_block, hosts_try_dane) },
121 { "hosts_try_fastopen", opt_stringptr,
122 (void *)offsetof(smtp_transport_options_block, hosts_try_fastopen) },
124 { "hosts_try_prdr", opt_stringptr,
125 (void *)offsetof(smtp_transport_options_block, hosts_try_prdr) },
128 { "hosts_verify_avoid_tls", opt_stringptr,
129 (void *)offsetof(smtp_transport_options_block, hosts_verify_avoid_tls) },
131 { "interface", opt_stringptr,
132 (void *)offsetof(smtp_transport_options_block, interface) },
133 { "keepalive", opt_bool,
134 (void *)offsetof(smtp_transport_options_block, keepalive) },
135 { "lmtp_ignore_quota", opt_bool,
136 (void *)offsetof(smtp_transport_options_block, lmtp_ignore_quota) },
137 { "max_rcpt", opt_int | opt_public,
138 (void *)offsetof(transport_instance, max_addresses) },
139 { "multi_domain", opt_expand_bool | opt_public,
140 (void *)offsetof(transport_instance, multi_domain) },
141 { "port", opt_stringptr,
142 (void *)offsetof(smtp_transport_options_block, port) },
143 { "protocol", opt_stringptr,
144 (void *)offsetof(smtp_transport_options_block, protocol) },
145 { "retry_include_ip_address", opt_expand_bool,
146 (void *)offsetof(smtp_transport_options_block, retry_include_ip_address) },
147 { "serialize_hosts", opt_stringptr,
148 (void *)offsetof(smtp_transport_options_block, serialize_hosts) },
149 { "size_addition", opt_int,
150 (void *)offsetof(smtp_transport_options_block, size_addition) }
152 ,{ "socks_proxy", opt_stringptr,
153 (void *)offsetof(smtp_transport_options_block, socks_proxy) }
156 ,{ "tls_certificate", opt_stringptr,
157 (void *)offsetof(smtp_transport_options_block, tls_certificate) },
158 { "tls_crl", opt_stringptr,
159 (void *)offsetof(smtp_transport_options_block, tls_crl) },
160 { "tls_dh_min_bits", opt_int,
161 (void *)offsetof(smtp_transport_options_block, tls_dh_min_bits) },
162 { "tls_privatekey", opt_stringptr,
163 (void *)offsetof(smtp_transport_options_block, tls_privatekey) },
164 { "tls_require_ciphers", opt_stringptr,
165 (void *)offsetof(smtp_transport_options_block, tls_require_ciphers) },
166 { "tls_sni", opt_stringptr,
167 (void *)offsetof(smtp_transport_options_block, tls_sni) },
168 { "tls_tempfail_tryclear", opt_bool,
169 (void *)offsetof(smtp_transport_options_block, tls_tempfail_tryclear) },
170 { "tls_try_verify_hosts", opt_stringptr,
171 (void *)offsetof(smtp_transport_options_block, tls_try_verify_hosts) },
172 { "tls_verify_cert_hostnames", opt_stringptr,
173 (void *)offsetof(smtp_transport_options_block,tls_verify_cert_hostnames)},
174 { "tls_verify_certificates", opt_stringptr,
175 (void *)offsetof(smtp_transport_options_block, tls_verify_certificates) },
176 { "tls_verify_hosts", opt_stringptr,
177 (void *)offsetof(smtp_transport_options_block, tls_verify_hosts) }
181 /* Size of the options list. An extern variable has to be used so that its
182 address can appear in the tables drtables.c. */
184 int smtp_transport_options_count =
185 sizeof(smtp_transport_options)/sizeof(optionlist);
187 /* Default private options block for the smtp transport. */
189 smtp_transport_options_block smtp_transport_option_defaults = {
191 NULL, /* fallback_hosts */
193 NULL, /* fallback_hostlist */
194 NULL, /* authenticated_sender */
195 US"$primary_hostname", /* helo_data */
196 NULL, /* interface */
198 US"smtp", /* protocol */
200 NULL, /* serialize_hosts */
201 NULL, /* hosts_try_auth */
202 NULL, /* hosts_require_auth */
203 US"*", /* hosts_try_chunking */
204 #ifdef EXPERIMENTAL_DANE
205 NULL, /* hosts_try_dane */
206 NULL, /* hosts_require_dane */
208 NULL, /* hosts_try_fastopen */
210 US"*", /* hosts_try_prdr */
213 US"*", /* hosts_request_ocsp (except under DANE; tls_client_start()) */
214 NULL, /* hosts_require_ocsp */
216 NULL, /* hosts_require_tls */
217 NULL, /* hosts_avoid_tls */
218 NULL, /* hosts_verify_avoid_tls */
219 NULL, /* hosts_avoid_pipelining */
220 NULL, /* hosts_avoid_esmtp */
221 NULL, /* hosts_nopass_tls */
222 5*60, /* command_timeout */
223 5*60, /* connect_timeout; shorter system default overrides */
224 5*60, /* data timeout */
225 10*60, /* final timeout */
226 1024, /* size_addition */
227 5, /* hosts_max_try */
228 50, /* hosts_max_try_hardlimit */
229 TRUE, /* address_retry_include_sender */
230 FALSE, /* allow_localhost */
231 FALSE, /* authenticated_sender_force */
232 FALSE, /* gethostbyname */
233 TRUE, /* dns_qualify_single */
234 FALSE, /* dns_search_parents */
235 { NULL, NULL }, /* dnssec_domains {request,require} */
236 TRUE, /* delay_after_cutoff */
237 FALSE, /* hosts_override */
238 FALSE, /* hosts_randomize */
239 TRUE, /* keepalive */
240 FALSE, /* lmtp_ignore_quota */
241 NULL, /* expand_retry_include_ip_address */
242 TRUE /* retry_include_ip_address */
244 ,NULL /* socks_proxy */
247 ,NULL, /* tls_certificate */
249 NULL, /* tls_privatekey */
250 NULL, /* tls_require_ciphers */
252 US"system", /* tls_verify_certificates */
253 EXIM_CLIENT_DH_DEFAULT_MIN_BITS,
254 /* tls_dh_min_bits */
255 TRUE, /* tls_tempfail_tryclear */
256 NULL, /* tls_verify_hosts */
257 US"*", /* tls_try_verify_hosts */
258 US"*" /* tls_verify_cert_hostnames */
261 , {NULL, /* dkim_canon */
262 NULL, /* dkim_domain */
263 NULL, /* dkim_private_key */
264 NULL, /* dkim_selector */
265 NULL, /* dkim_sign_headers */
266 NULL, /* dkim_strict */
267 FALSE} /* dot_stuffed */
271 /* some DSN flags for use later */
273 static int rf_list[] = {rf_notify_never, rf_notify_success,
274 rf_notify_failure, rf_notify_delay };
276 static uschar *rf_names[] = { US"NEVER", US"SUCCESS", US"FAILURE", US"DELAY" };
282 static uschar *smtp_command; /* Points to last cmd for error messages */
283 static uschar *mail_command; /* Points to MAIL cmd for error messages */
284 static uschar *data_command = US""; /* Points to DATA cmd for error messages */
285 static BOOL update_waiting; /* TRUE to update the "wait" database */
286 static BOOL pipelining_active; /* current transaction is in pipe mode */
289 /*************************************************
290 * Setup entry point *
291 *************************************************/
293 /* This function is called when the transport is about to be used,
294 but before running it in a sub-process. It is used for two things:
296 (1) To set the fallback host list in addresses, when delivering.
297 (2) To pass back the interface, port, protocol, and other options, for use
298 during callout verification.
301 tblock pointer to the transport instance block
302 addrlist list of addresses about to be transported
303 tf if not NULL, pointer to block in which to return options
304 uid the uid that will be set (not used)
305 gid the gid that will be set (not used)
306 errmsg place for error message (not used)
308 Returns: OK always (FAIL, DEFER not used)
312 smtp_transport_setup(transport_instance *tblock, address_item *addrlist,
313 transport_feedback *tf, uid_t uid, gid_t gid, uschar **errmsg)
315 smtp_transport_options_block *ob =
316 (smtp_transport_options_block *)(tblock->options_block);
318 errmsg = errmsg; /* Keep picky compilers happy */
322 /* Pass back options if required. This interface is getting very messy. */
326 tf->interface = ob->interface;
328 tf->protocol = ob->protocol;
329 tf->hosts = ob->hosts;
330 tf->hosts_override = ob->hosts_override;
331 tf->hosts_randomize = ob->hosts_randomize;
332 tf->gethostbyname = ob->gethostbyname;
333 tf->qualify_single = ob->dns_qualify_single;
334 tf->search_parents = ob->dns_search_parents;
335 tf->helo_data = ob->helo_data;
338 /* Set the fallback host list for all the addresses that don't have fallback
339 host lists, provided that the local host wasn't present in the original host
342 if (!testflag(addrlist, af_local_host_removed))
343 for (; addrlist; addrlist = addrlist->next)
344 if (!addrlist->fallback_hosts) addrlist->fallback_hosts = ob->fallback_hostlist;
351 /*************************************************
352 * Initialization entry point *
353 *************************************************/
355 /* Called for each instance, after its options have been read, to
356 enable consistency checks to be done, or anything else that needs
359 Argument: pointer to the transport instance block
364 smtp_transport_init(transport_instance *tblock)
366 smtp_transport_options_block *ob =
367 (smtp_transport_options_block *)(tblock->options_block);
369 /* Retry_use_local_part defaults FALSE if unset */
371 if (tblock->retry_use_local_part == TRUE_UNSET)
372 tblock->retry_use_local_part = FALSE;
374 /* Set the default port according to the protocol */
376 if (ob->port == NULL)
377 ob->port = (strcmpic(ob->protocol, US"lmtp") == 0)? US"lmtp" :
378 (strcmpic(ob->protocol, US"smtps") == 0)? US"smtps" : US"smtp";
380 /* Set up the setup entry point, to be called before subprocesses for this
383 tblock->setup = smtp_transport_setup;
385 /* Complain if any of the timeouts are zero. */
387 if (ob->command_timeout <= 0 || ob->data_timeout <= 0 ||
388 ob->final_timeout <= 0)
389 log_write(0, LOG_PANIC_DIE|LOG_CONFIG,
390 "command, data, or final timeout value is zero for %s transport",
393 /* If hosts_override is set and there are local hosts, set the global
394 flag that stops verify from showing router hosts. */
396 if (ob->hosts_override && ob->hosts != NULL) tblock->overrides_hosts = TRUE;
398 /* If there are any fallback hosts listed, build a chain of host items
399 for them, but do not do any lookups at this time. */
401 host_build_hostlist(&(ob->fallback_hostlist), ob->fallback_hosts, FALSE);
408 /*************************************************
409 * Set delivery info into all active addresses *
410 *************************************************/
412 /* Only addresses whose status is >= PENDING are relevant. A lesser
413 status means that an address is not currently being processed.
416 addrlist points to a chain of addresses
417 errno_value to put in each address's errno field
418 msg to put in each address's message field
419 rc to put in each address's transport_return field
420 pass_message if TRUE, set the "pass message" flag in the address
421 host if set, mark addrs as having used this host
422 smtp_greeting from peer
423 helo_response from peer
425 If errno_value has the special value ERRNO_CONNECTTIMEOUT, ETIMEDOUT is put in
426 the errno field, and RTEF_CTOUT is ORed into the more_errno field, to indicate
427 this particular type of timeout.
433 set_errno(address_item *addrlist, int errno_value, uschar *msg, int rc,
434 BOOL pass_message, host_item * host
435 #ifdef EXPERIMENTAL_DSN_INFO
436 , const uschar * smtp_greeting, const uschar * helo_response
442 if (errno_value == ERRNO_CONNECTTIMEOUT)
444 errno_value = ETIMEDOUT;
445 orvalue = RTEF_CTOUT;
447 for (addr = addrlist; addr; addr = addr->next)
448 if (addr->transport_return >= PENDING)
450 addr->basic_errno = errno_value;
451 addr->more_errno |= orvalue;
455 if (pass_message) setflag(addr, af_pass_message);
457 addr->transport_return = rc;
460 addr->host_used = host;
461 #ifdef EXPERIMENTAL_DSN_INFO
463 {uschar * s = Ustrchr(smtp_greeting, '\n'); if (s) *s = '\0';}
464 addr->smtp_greeting = smtp_greeting;
467 {uschar * s = Ustrchr(helo_response, '\n'); if (s) *s = '\0';}
468 addr->helo_response = helo_response;
475 set_errno_nohost(address_item *addrlist, int errno_value, uschar *msg, int rc,
478 set_errno(addrlist, errno_value, msg, rc, pass_message, NULL
479 #ifdef EXPERIMENTAL_DSN_INFO
486 /*************************************************
487 * Check an SMTP response *
488 *************************************************/
490 /* This function is given an errno code and the SMTP response buffer
491 to analyse, together with the host identification for generating messages. It
492 sets an appropriate message and puts the first digit of the response code into
493 the yield variable. If no response was actually read, a suitable digit is
497 host the current host, to get its name for messages
498 errno_value pointer to the errno value
499 more_errno from the top address for use with ERRNO_FILTER_FAIL
500 buffer the SMTP response buffer
501 yield where to put a one-digit SMTP response code
502 message where to put an error message
503 pass_message set TRUE if message is an SMTP response
505 Returns: TRUE if an SMTP "QUIT" command should be sent, else FALSE
509 check_response(host_item *host, int *errno_value, int more_errno,
510 uschar *buffer, int *yield, uschar **message, BOOL *pass_message)
512 uschar * pl = pipelining_active ? US"pipelined " : US"";
515 *yield = '4'; /* Default setting is to give a temporary error */
519 case ETIMEDOUT: /* Handle response timeout */
520 *message = US string_sprintf("SMTP timeout after %s%s",
522 if (transport_count > 0)
523 *message = US string_sprintf("%s (%d bytes written)", *message,
527 case ERRNO_SMTPFORMAT: /* Handle malformed SMTP response */
528 s = string_printing(buffer);
529 while (isspace(*s)) s++;
531 ? string_sprintf("Malformed SMTP reply (an empty line) "
532 "in response to %s%s", pl, smtp_command)
533 : string_sprintf("Malformed SMTP reply in response to %s%s: %s",
534 pl, smtp_command, s);
537 case ERRNO_FILTER_FAIL: /* Handle a failed filter process error;
538 can't send QUIT as we mustn't end the DATA. */
539 *message = string_sprintf("transport filter process failed (%d)%s",
541 more_errno == EX_EXECFAILED ? ": unable to execute command" : "");
544 case ERRNO_CHHEADER_FAIL: /* Handle a failed add_headers expansion;
545 can't send QUIT as we mustn't end the DATA. */
547 string_sprintf("failed to expand headers_add or headers_remove: %s",
548 expand_string_message);
551 case ERRNO_WRITEINCOMPLETE: /* failure to write a complete data block */
552 *message = string_sprintf("failed to write a data block");
556 case ERRNO_UTF8_FWD: /* no advertised SMTPUTF8, for international message */
557 *message = US"utf8 support required but not offered for forwarding";
558 DEBUG(D_deliver|D_transport) debug_printf("%s\n", *message);
563 /* Handle error responses from the remote mailer. */
567 *message = string_sprintf("SMTP error from remote mail server after %s%s: "
568 "%s", pl, smtp_command, s = string_printing(buffer));
569 *pass_message = TRUE;
574 /* No data was read. If there is no errno, this must be the EOF (i.e.
575 connection closed) case, which causes deferral. An explicit connection reset
576 error has the same effect. Otherwise, put the host's identity in the message,
577 leaving the errno value to be interpreted as well. In all cases, we have to
578 assume the connection is now dead. */
580 if (*errno_value == 0 || *errno_value == ECONNRESET)
582 *errno_value = ERRNO_SMTPCLOSED;
583 *message = US string_sprintf("Remote host closed connection "
584 "in response to %s%s", pl, smtp_command);
587 *message = US string_sprintf("%s [%s]", host->name, host->address);
594 /*************************************************
595 * Write error message to logs *
596 *************************************************/
598 /* This writes to the main log and to the message log.
601 addr the address item containing error information
602 host the current host
608 write_logs(address_item *addr, host_item *host)
610 uschar * message = LOGGING(outgoing_port)
611 ? string_sprintf("H=%s [%s]:%d", host->name, host->address,
612 host->port == PORT_NONE ? 25 : host->port)
613 : string_sprintf("H=%s [%s]", host->name, host->address);
617 message = string_sprintf("%s: %s", message, addr->message);
618 if (addr->basic_errno > 0)
619 message = string_sprintf("%s: %s", message, strerror(addr->basic_errno));
620 log_write(0, LOG_MAIN, "%s", message);
621 deliver_msglog("%s %s\n", tod_stamp(tod_log), message);
625 const uschar * s = exim_errstr(addr->basic_errno);
626 log_write(0, LOG_MAIN, "%s %s", message, s);
627 deliver_msglog("%s %s %s\n", tod_stamp(tod_log), message, s);
632 msglog_line(host_item * host, uschar * message)
634 deliver_msglog("%s H=%s [%s] %s\n", tod_stamp(tod_log),
635 host->name, host->address, message);
640 #ifndef DISABLE_EVENT
641 /*************************************************
642 * Post-defer action *
643 *************************************************/
645 /* This expands an arbitrary per-transport string.
646 It might, for example, be used to write to the database log.
649 addr the address item containing error information
650 host the current host
656 deferred_event_raise(address_item *addr, host_item *host)
658 uschar * action = addr->transport->event_action;
659 const uschar * save_domain;
665 save_domain = deliver_domain;
666 save_local = deliver_localpart;
668 /*XXX would ip & port already be set up? */
669 deliver_host_address = string_copy(host->address);
670 deliver_host_port = host->port == PORT_NONE ? 25 : host->port;
671 event_defer_errno = addr->basic_errno;
673 router_name = addr->router->name;
674 transport_name = addr->transport->name;
675 deliver_domain = addr->domain;
676 deliver_localpart = addr->local_part;
678 (void) event_raise(action, US"msg:host:defer",
680 ? addr->basic_errno > 0
681 ? string_sprintf("%s: %s", addr->message, strerror(addr->basic_errno))
682 : string_copy(addr->message)
683 : addr->basic_errno > 0
684 ? string_copy(US strerror(addr->basic_errno))
687 deliver_localpart = save_local;
688 deliver_domain = save_domain;
689 router_name = transport_name = NULL;
693 /*************************************************
694 * Synchronize SMTP responses *
695 *************************************************/
697 /* This function is called from smtp_deliver() to receive SMTP responses from
698 the server, and match them up with the commands to which they relate. When
699 PIPELINING is not in use, this function is called after every command, and is
700 therefore somewhat over-engineered, but it is simpler to use a single scheme
701 that works both with and without PIPELINING instead of having two separate sets
704 The set of commands that are buffered up with pipelining may start with MAIL
705 and may end with DATA; in between are RCPT commands that correspond to the
706 addresses whose status is PENDING_DEFER. All other commands (STARTTLS, AUTH,
707 etc.) are never buffered.
709 Errors after MAIL or DATA abort the whole process leaving the response in the
710 buffer. After MAIL, pending responses are flushed, and the original command is
711 re-instated in big_buffer for error messages. For RCPT commands, the remote is
712 permitted to reject some recipient addresses while accepting others. However
713 certain errors clearly abort the whole process. Set the value in
714 transport_return to PENDING_OK if the address is accepted. If there is a
715 subsequent general error, it will get reset accordingly. If not, it will get
716 converted to OK at the end.
719 sx smtp connection context
720 count the number of responses to read
721 pending_DATA 0 if last command sent was not DATA
722 +1 if previously had a good recipient
723 -1 if not previously had a good recipient
725 Returns: 3 if at least one address had 2xx and one had 5xx
726 2 if at least one address had 5xx but none had 2xx
727 1 if at least one host had a 2xx response, but none had 5xx
728 0 no address had 2xx or 5xx but no errors (all 4xx, or just DATA)
729 -1 timeout while reading RCPT response
730 -2 I/O or other non-response error for RCPT
731 -3 DATA or MAIL failed - errno and buffer set
735 sync_responses(smtp_context * sx, int count, int pending_DATA)
737 address_item *addr = sx->sync_addr;
738 smtp_transport_options_block *ob =
739 (smtp_transport_options_block *)sx->tblock->options_block;
742 /* Handle the response for a MAIL command. On error, reinstate the original
743 command in big_buffer for error message use, and flush any further pending
744 responses before returning, except after I/O errors and timeouts. */
746 if (sx->pending_MAIL)
749 if (!smtp_read_response(&sx->inblock, sx->buffer, sizeof(sx->buffer),
750 '2', ob->command_timeout))
752 DEBUG(D_transport) debug_printf("bad response for MAIL\n");
753 Ustrcpy(big_buffer, mail_command); /* Fits, because it came from there! */
754 if (errno == 0 && sx->buffer[0] != 0)
756 uschar flushbuffer[4096];
758 if (sx->buffer[0] == '4')
760 save_errno = ERRNO_MAIL4XX;
761 addr->more_errno |= ((sx->buffer[1] - '0')*10 + sx->buffer[2] - '0') << 8;
765 if (!smtp_read_response(&sx->inblock, flushbuffer, sizeof(flushbuffer),
766 '2', ob->command_timeout)
767 && (errno != 0 || flushbuffer[0] == 0))
773 if (pending_DATA) count--; /* Number of RCPT responses to come */
774 while (count-- > 0) /* Mark any pending addrs with the host used */
776 while (addr->transport_return != PENDING_DEFER) addr = addr->next;
777 addr->host_used = sx->host;
784 if (pending_DATA) count--; /* Number of RCPT responses to come */
786 /* Read and handle the required number of RCPT responses, matching each one up
787 with an address by scanning for the next address whose status is PENDING_DEFER.
792 while (addr->transport_return != PENDING_DEFER)
793 if (!(addr = addr->next))
796 /* The address was accepted */
797 addr->host_used = sx->host;
799 if (smtp_read_response(&sx->inblock, sx->buffer, sizeof(sx->buffer),
800 '2', ob->command_timeout))
803 addr->transport_return = PENDING_OK;
805 /* If af_dr_retry_exists is set, there was a routing delay on this address;
806 ensure that any address-specific retry record is expunged. We do this both
807 for the basic key and for the version that also includes the sender. */
809 if (testflag(addr, af_dr_retry_exists))
811 uschar *altkey = string_sprintf("%s:<%s>", addr->address_retry_key,
813 retry_add_item(addr, altkey, rf_delete);
814 retry_add_item(addr, addr->address_retry_key, rf_delete);
818 /* Timeout while reading the response */
820 else if (errno == ETIMEDOUT)
822 uschar *message = string_sprintf("SMTP timeout after RCPT TO:<%s>",
823 transport_rcpt_address(addr, sx->tblock->rcpt_include_affixes));
824 set_errno_nohost(sx->first_addr, ETIMEDOUT, message, DEFER, FALSE);
825 retry_add_item(addr, addr->address_retry_key, 0);
826 update_waiting = FALSE;
830 /* Handle other errors in obtaining an SMTP response by returning -1. This
831 will cause all the addresses to be deferred. Restore the SMTP command in
832 big_buffer for which we are checking the response, so the error message
835 else if (errno != 0 || sx->buffer[0] == 0)
837 string_format(big_buffer, big_buffer_size, "RCPT TO:<%s>",
838 transport_rcpt_address(addr, sx->tblock->rcpt_include_affixes));
842 /* Handle SMTP permanent and temporary response codes. */
847 string_sprintf("SMTP error from remote mail server after RCPT TO:<%s>: "
848 "%s", transport_rcpt_address(addr, sx->tblock->rcpt_include_affixes),
849 string_printing(sx->buffer));
850 setflag(addr, af_pass_message);
852 msglog_line(sx->host, addr->message);
854 /* The response was 5xx */
856 if (sx->buffer[0] == '5')
858 addr->transport_return = FAIL;
862 /* The response was 4xx */
866 addr->transport_return = DEFER;
867 addr->basic_errno = ERRNO_RCPT4XX;
868 addr->more_errno |= ((sx->buffer[1] - '0')*10 + sx->buffer[2] - '0') << 8;
872 #ifndef DISABLE_EVENT
873 event_defer_errno = addr->more_errno;
874 msg_event_raise(US"msg:rcpt:host:defer", addr);
877 /* Log temporary errors if there are more hosts to be tried.
878 If not, log this last one in the == line. */
881 log_write(0, LOG_MAIN, "H=%s [%s]: %s",
882 sx->host->name, sx->host->address, addr->message);
884 #ifndef DISABLE_EVENT
886 msg_event_raise(US"msg:rcpt:defer", addr);
889 /* Do not put this message on the list of those waiting for specific
890 hosts, as otherwise it is likely to be tried too often. */
892 update_waiting = FALSE;
894 /* Add a retry item for the address so that it doesn't get tried again
895 too soon. If address_retry_include_sender is true, add the sender address
899 ob->address_retry_include_sender
900 ? string_sprintf("%s:<%s>", addr->address_retry_key, sender_address)
901 : addr->address_retry_key,
906 } /* Loop for next RCPT response */
908 /* Update where to start at for the next block of responses, unless we
909 have already handled all the addresses. */
911 if (addr) sx->sync_addr = addr->next;
913 /* Handle a response to DATA. If we have not had any good recipients, either
914 previously or in this block, the response is ignored. */
916 if (pending_DATA != 0 &&
917 !smtp_read_response(&sx->inblock, sx->buffer, sizeof(sx->buffer),
918 '3', ob->command_timeout))
923 if (pending_DATA > 0 || (yield & 1) != 0)
925 if (errno == 0 && sx->buffer[0] == '4')
927 errno = ERRNO_DATA4XX;
928 sx->first_addr->more_errno |= ((sx->buffer[1] - '0')*10 + sx->buffer[2] - '0') << 8;
932 (void)check_response(sx->host, &errno, 0, sx->buffer, &code, &msg, &pass_message);
933 DEBUG(D_transport) debug_printf("%s\nerror for DATA ignored: pipelining "
934 "is in use and there were no good recipients\n", msg);
937 /* All responses read and handled; MAIL (if present) received 2xx and DATA (if
938 present) received 3xx. If any RCPTs were handled and yielded anything other
939 than 4xx, yield will be set non-zero. */
946 /* Do the client side of smtp-level authentication */
949 buffer EHLO response from server (gets overwritten)
950 addrlist chain of potential addresses to deliver
951 host host to deliver to
953 ibp, obp comms channel control blocks
956 OK Success, or failed (but not required): global "smtp_authenticated" set
957 DEFER Failed authentication (and was required)
958 ERROR Internal problem
960 FAIL_SEND Failed communications - transmit
965 smtp_auth(uschar *buffer, unsigned bufsize, address_item *addrlist, host_item *host,
966 smtp_transport_options_block *ob, BOOL is_esmtp,
967 smtp_inblock *ibp, smtp_outblock *obp)
970 uschar *fail_reason = US"server did not advertise AUTH support";
972 smtp_authenticated = FALSE;
973 client_authenticator = client_authenticated_id = client_authenticated_sender = NULL;
974 require_auth = verify_check_given_host(&ob->hosts_require_auth, host);
976 if (is_esmtp && !regex_AUTH) regex_AUTH =
977 regex_must_compile(US"\\n250[\\s\\-]AUTH\\s+([\\-\\w\\s]+)(?:\\n|$)",
980 if (is_esmtp && regex_match_and_setup(regex_AUTH, buffer, 0, -1))
982 uschar *names = string_copyn(expand_nstring[1], expand_nlength[1]);
983 expand_nmax = -1; /* reset */
985 /* Must not do this check until after we have saved the result of the
986 regex match above. */
988 if (require_auth == OK ||
989 verify_check_given_host(&ob->hosts_try_auth, host) == OK)
992 fail_reason = US"no common mechanisms were found";
994 DEBUG(D_transport) debug_printf("scanning authentication mechanisms\n");
996 /* Scan the configured authenticators looking for one which is configured
997 for use as a client, which is not suppressed by client_condition, and
998 whose name matches an authentication mechanism supported by the server.
999 If one is found, attempt to authenticate by calling its client function.
1002 for (au = auths; !smtp_authenticated && au != NULL; au = au->next)
1006 (au->client_condition != NULL &&
1007 !expand_check_condition(au->client_condition, au->name,
1008 US"client authenticator")))
1010 DEBUG(D_transport) debug_printf("skipping %s authenticator: %s\n",
1012 (au->client)? "client_condition is false" :
1013 "not configured as a client");
1017 /* Loop to scan supported server mechanisms */
1022 int len = Ustrlen(au->public_name);
1023 while (isspace(*p)) p++;
1025 if (strncmpic(au->public_name, p, len) != 0 ||
1026 (p[len] != 0 && !isspace(p[len])))
1028 while (*p != 0 && !isspace(*p)) p++;
1032 /* Found data for a listed mechanism. Call its client entry. Set
1033 a flag in the outblock so that data is overwritten after sending so
1034 that reflections don't show it. */
1036 fail_reason = US"authentication attempt(s) failed";
1037 obp->authenticating = TRUE;
1038 rc = (au->info->clientcode)(au, ibp, obp,
1039 ob->command_timeout, buffer, bufsize);
1040 obp->authenticating = FALSE;
1041 DEBUG(D_transport) debug_printf("%s authenticator yielded %d\n",
1044 /* A temporary authentication failure must hold up delivery to
1045 this host. After a permanent authentication failure, we carry on
1046 to try other authentication methods. If all fail hard, try to
1047 deliver the message unauthenticated unless require_auth was set. */
1052 smtp_authenticated = TRUE; /* stops the outer loop */
1053 client_authenticator = au->name;
1054 if (au->set_client_id != NULL)
1055 client_authenticated_id = expand_string(au->set_client_id);
1058 /* Failure after writing a command */
1063 /* Failure after reading a response */
1066 if (errno != 0 || buffer[0] != '5') return FAIL;
1067 log_write(0, LOG_MAIN, "%s authenticator failed H=%s [%s] %s",
1068 au->name, host->name, host->address, buffer);
1071 /* Failure by some other means. In effect, the authenticator
1072 decided it wasn't prepared to handle this case. Typically this
1073 is the result of "fail" in an expansion string. Do we need to
1074 log anything here? Feb 2006: a message is now put in the buffer
1075 if logging is required. */
1079 log_write(0, LOG_MAIN, "%s authenticator cancelled "
1080 "authentication H=%s [%s] %s", au->name, host->name,
1081 host->address, buffer);
1084 /* Internal problem, message in buffer. */
1087 set_errno_nohost(addrlist, ERRNO_AUTHPROB, string_copy(buffer),
1092 break; /* If not authenticated, try next authenticator */
1093 } /* Loop for scanning supported server mechanisms */
1094 } /* Loop for further authenticators */
1098 /* If we haven't authenticated, but are required to, give up. */
1100 if (require_auth == OK && !smtp_authenticated)
1102 set_errno_nohost(addrlist, ERRNO_AUTHFAIL,
1103 string_sprintf("authentication required but %s", fail_reason), DEFER,
1112 /* Construct AUTH appendix string for MAIL TO */
1115 buffer to build string
1116 addrlist chain of potential addresses to deliver
1117 ob transport options
1119 Globals smtp_authenticated
1120 client_authenticated_sender
1121 Return True on error, otherwise buffer has (possibly empty) terminated string
1125 smtp_mail_auth_str(uschar *buffer, unsigned bufsize, address_item *addrlist,
1126 smtp_transport_options_block *ob)
1128 uschar *local_authenticated_sender = authenticated_sender;
1131 debug_printf("smtp_mail_auth_str: as<%s> os<%s> SA<%s>\n", authenticated_sender, ob->authenticated_sender, smtp_authenticated?"Y":"N");
1134 if (ob->authenticated_sender != NULL)
1136 uschar *new = expand_string(ob->authenticated_sender);
1139 if (!expand_string_forcedfail)
1141 uschar *message = string_sprintf("failed to expand "
1142 "authenticated_sender: %s", expand_string_message);
1143 set_errno_nohost(addrlist, ERRNO_EXPANDFAIL, message, DEFER, FALSE);
1147 else if (new[0] != 0) local_authenticated_sender = new;
1150 /* Add the authenticated sender address if present */
1152 if ((smtp_authenticated || ob->authenticated_sender_force) &&
1153 local_authenticated_sender != NULL)
1155 string_format(buffer, bufsize, " AUTH=%s",
1156 auth_xtextencode(local_authenticated_sender,
1157 Ustrlen(local_authenticated_sender)));
1158 client_authenticated_sender = string_copy(local_authenticated_sender);
1168 #ifdef EXPERIMENTAL_DANE
1169 /* Lookup TLSA record for host/port.
1170 Return: OK success with dnssec; DANE mode
1171 DEFER Do not use this host now, may retry later
1172 FAIL_FORCED No TLSA record; DANE not usable
1173 FAIL Do not use this connection
1177 tlsa_lookup(const host_item * host, dns_answer * dnsa, BOOL dane_required)
1179 /* move this out to host.c given the similarity to dns_lookup() ? */
1181 const uschar * fullname = buffer;
1183 /* TLSA lookup string */
1184 (void)sprintf(CS buffer, "_%d._tcp.%.256s", host->port, host->name);
1186 switch (dns_lookup(dnsa, buffer, T_TLSA, &fullname))
1189 if (!dns_is_secure(dnsa))
1191 log_write(0, LOG_MAIN, "DANE error: TLSA lookup not DNSSEC");
1197 return DEFER; /* just defer this TLS'd conn */
1199 case DNS_NODATA: /* no TLSA RR for this lookup */
1200 case DNS_NOMATCH: /* no records at all for this lookup */
1201 return dane_required ? FAIL : FAIL_FORCED;
1205 return dane_required ? FAIL : DEFER;
1212 typedef struct smtp_compare_s
1214 uschar *current_sender_address;
1215 struct transport_instance *tblock;
1219 /* Create a unique string that identifies this message, it is based on
1220 sender_address, helo_data and tls_certificate if enabled.
1224 smtp_local_identity(uschar * sender, struct transport_instance * tblock)
1226 address_item * addr1;
1227 uschar * if1 = US"";
1228 uschar * helo1 = US"";
1230 uschar * tlsc1 = US"";
1232 uschar * save_sender_address = sender_address;
1233 uschar * local_identity = NULL;
1234 smtp_transport_options_block * ob =
1235 (smtp_transport_options_block *)tblock->options_block;
1237 sender_address = sender;
1239 addr1 = deliver_make_addr (sender, TRUE);
1240 deliver_set_expansions(addr1);
1243 if1 = expand_string(ob->interface);
1246 helo1 = expand_string(ob->helo_data);
1249 if (ob->tls_certificate)
1250 tlsc1 = expand_string(ob->tls_certificate);
1251 local_identity = string_sprintf ("%s^%s^%s", if1, helo1, tlsc1);
1253 local_identity = string_sprintf ("%s^%s", if1, helo1);
1256 deliver_set_expansions(NULL);
1257 sender_address = save_sender_address;
1259 return local_identity;
1264 /* This routine is a callback that is called from transport_check_waiting.
1265 This function will evaluate the incoming message versus the previous
1266 message. If the incoming message is using a different local identity then
1267 we will veto this new message. */
1270 smtp_are_same_identities(uschar * message_id, smtp_compare_t * s_compare)
1272 uschar * message_local_identity,
1273 * current_local_identity,
1274 * new_sender_address;
1276 current_local_identity =
1277 smtp_local_identity(s_compare->current_sender_address, s_compare->tblock);
1279 if (!(new_sender_address = deliver_get_sender_address(message_id)))
1282 message_local_identity =
1283 smtp_local_identity(new_sender_address, s_compare->tblock);
1285 return Ustrcmp(current_local_identity, message_local_identity) == 0;
1291 ehlo_response(uschar * buf, uschar checks)
1293 size_t bsize = Ustrlen(buf);
1296 if ( checks & PEER_OFFERED_TLS
1297 && pcre_exec(regex_STARTTLS, NULL, CS buf, bsize, 0, PCRE_EOPT, NULL, 0) < 0)
1298 checks &= ~PEER_OFFERED_TLS;
1301 if ( checks & PEER_OFFERED_IGNQ
1302 && pcre_exec(regex_IGNOREQUOTA, NULL, CS buf, bsize, 0,
1303 PCRE_EOPT, NULL, 0) < 0)
1304 checks &= ~PEER_OFFERED_IGNQ;
1306 if ( checks & PEER_OFFERED_CHUNKING
1307 && pcre_exec(regex_CHUNKING, NULL, CS buf, bsize, 0, PCRE_EOPT, NULL, 0) < 0)
1308 checks &= ~PEER_OFFERED_CHUNKING;
1310 #ifndef DISABLE_PRDR
1311 if ( checks & PEER_OFFERED_PRDR
1312 && pcre_exec(regex_PRDR, NULL, CS buf, bsize, 0, PCRE_EOPT, NULL, 0) < 0)
1313 checks &= ~PEER_OFFERED_PRDR;
1317 if ( checks & PEER_OFFERED_UTF8
1318 && pcre_exec(regex_UTF8, NULL, CS buf, bsize, 0, PCRE_EOPT, NULL, 0) < 0)
1319 checks &= ~PEER_OFFERED_UTF8;
1322 if ( checks & PEER_OFFERED_DSN
1323 && pcre_exec(regex_DSN, NULL, CS buf, bsize, 0, PCRE_EOPT, NULL, 0) < 0)
1324 checks &= ~PEER_OFFERED_DSN;
1326 if ( checks & PEER_OFFERED_PIPE
1327 && pcre_exec(regex_PIPELINING, NULL, CS buf, bsize, 0,
1328 PCRE_EOPT, NULL, 0) < 0)
1329 checks &= ~PEER_OFFERED_PIPE;
1331 if ( checks & PEER_OFFERED_SIZE
1332 && pcre_exec(regex_SIZE, NULL, CS buf, bsize, 0, PCRE_EOPT, NULL, 0) < 0)
1333 checks &= ~PEER_OFFERED_SIZE;
1340 /* Callback for emitting a BDAT data chunk header.
1342 If given a nonzero size, first flush any buffered SMTP commands
1343 then emit the command.
1345 Reap previous SMTP command responses if requested.
1346 Reap one SMTP command response if requested.
1348 Returns: OK or ERROR
1352 smtp_chunk_cmd_callback(int fd, transport_ctx * tctx,
1353 unsigned chunk_size, unsigned flags)
1355 smtp_transport_options_block * ob =
1356 (smtp_transport_options_block *)(tctx->tblock->options_block);
1357 smtp_context * sx = tctx->smtp_context;
1361 /* Write SMTP chunk header command */
1365 if((cmd_count = smtp_write_command(&sx->outblock, FALSE, "BDAT %u%s\r\n",
1367 flags & tc_chunk_last ? " LAST" : "")
1368 ) < 0) return ERROR;
1369 if (flags & tc_chunk_last)
1370 data_command = string_copy(big_buffer); /* Save for later error message */
1373 prev_cmd_count = cmd_count += sx->cmd_count;
1375 /* Reap responses for any previous, but not one we just emitted */
1379 if (sx->pending_BDAT)
1382 if (flags & tc_reap_prev && prev_cmd_count > 0)
1384 DEBUG(D_transport) debug_printf("look for %d responses"
1385 " for previous pipelined cmds\n", prev_cmd_count);
1387 switch(sync_responses(sx, prev_cmd_count, 0))
1389 case 1: /* 2xx (only) => OK */
1390 case 3: sx->good_RCPT = TRUE; /* 2xx & 5xx => OK & progress made */
1391 case 2: sx->completed_addr = TRUE; /* 5xx (only) => progress made */
1392 case 0: break; /* No 2xx or 5xx, but no probs */
1394 case -1: /* Timeout on RCPT */
1395 default: return ERROR; /* I/O error, or any MAIL/DATA error */
1398 if (!sx->pending_BDAT)
1399 pipelining_active = FALSE;
1402 /* Reap response for an outstanding BDAT */
1404 if (sx->pending_BDAT)
1406 DEBUG(D_transport) debug_printf("look for one response for BDAT\n");
1408 if (!smtp_read_response(&sx->inblock, sx->buffer, sizeof(sx->buffer), '2',
1409 ob->command_timeout))
1411 if (errno == 0 && sx->buffer[0] == '4')
1413 errno = ERRNO_DATA4XX; /*XXX does this actually get used? */
1414 sx->addrlist->more_errno |=
1415 ((sx->buffer[1] - '0')*10 + sx->buffer[2] - '0') << 8;
1420 sx->pending_BDAT = FALSE;
1421 pipelining_active = FALSE;
1423 else if (chunk_size > 0)
1424 sx->pending_BDAT = TRUE;
1427 sx->cmd_count = cmd_count;
1433 /*************************************************
1434 * Make connection for given message *
1435 *************************************************/
1439 ctx connection context
1440 suppress_tls if TRUE, don't attempt a TLS connection - this is set for
1441 a second attempt after TLS initialization fails
1443 Returns: OK - the connection was made and the delivery attempted;
1444 fd is set in the conn context, tls_out set up.
1445 DEFER - the connection could not be made, or something failed
1446 while setting up the SMTP session, or there was a
1447 non-message-specific error, such as a timeout.
1448 ERROR - helo_data or add_headers or authenticated_sender is
1449 specified for this transport, and the string failed
1453 smtp_setup_conn(smtp_context * sx, BOOL suppress_tls)
1455 #if defined(SUPPORT_TLS) && defined(EXPERIMENTAL_DANE)
1456 dns_answer tlsa_dnsa;
1458 BOOL pass_message = FALSE;
1459 uschar * message = NULL;
1463 sx->ob = (smtp_transport_options_block *) sx->tblock->options_block;
1465 sx->lmtp = strcmpic(sx->ob->protocol, US"lmtp") == 0;
1466 sx->smtps = strcmpic(sx->ob->protocol, US"smtps") == 0;
1468 sx->send_rset = TRUE;
1469 sx->send_quit = TRUE;
1470 sx->setting_up = TRUE;
1472 sx->esmtp_sent = FALSE;
1474 sx->utf8_needed = FALSE;
1476 sx->dsn_all_lasthop = TRUE;
1477 #if defined(SUPPORT_TLS) && defined(EXPERIMENTAL_DANE)
1479 sx->dane_required = verify_check_given_host(&sx->ob->hosts_require_dane, sx->host) == OK;
1482 if ((sx->max_rcpt = sx->tblock->max_addresses) == 0) sx->max_rcpt = 999999;
1483 sx->peer_offered = 0;
1484 sx->igquotstr = US"";
1485 if (!sx->helo_data) sx->helo_data = sx->ob->helo_data;
1486 #ifdef EXPERIMENTAL_DSN_INFO
1487 sx->smtp_greeting = NULL;
1488 sx->helo_response = NULL;
1491 smtp_command = US"initial connection";
1492 sx->buffer[0] = '\0';
1494 /* Set up the buffer for reading SMTP response packets. */
1496 sx->inblock.buffer = sx->inbuffer;
1497 sx->inblock.buffersize = sizeof(sx->inbuffer);
1498 sx->inblock.ptr = sx->inbuffer;
1499 sx->inblock.ptrend = sx->inbuffer;
1501 /* Set up the buffer for holding SMTP commands while pipelining */
1503 sx->outblock.buffer = sx->outbuffer;
1504 sx->outblock.buffersize = sizeof(sx->outbuffer);
1505 sx->outblock.ptr = sx->outbuffer;
1506 sx->outblock.cmd_count = 0;
1507 sx->outblock.authenticating = FALSE;
1509 /* Reset the parameters of a TLS session. */
1512 tls_out.cipher = NULL; /* the one we may use for this transport */
1513 tls_out.ourcert = NULL;
1514 tls_out.peercert = NULL;
1515 tls_out.peerdn = NULL;
1516 #if defined(SUPPORT_TLS) && !defined(USE_GNUTLS)
1519 tls_out.ocsp = OCSP_NOT_REQ;
1521 /* Flip the legacy TLS-related variables over to the outbound set in case
1522 they're used in the context of the transport. Don't bother resetting
1523 afterward (when being used by a transport) as we're in a subprocess.
1524 For verify, unflipped once the callout is dealt with */
1526 tls_modify_variables(&tls_out);
1531 set_errno_nohost(sx->addrlist, ERRNO_TLSFAILURE, US"TLS support not available",
1537 /* Make a connection to the host if this isn't a continued delivery, and handle
1538 the initial interaction and HELO/EHLO/LHLO. Connect timeout errors are handled
1539 specially so they can be identified for retries. */
1541 if (continue_hostname == NULL)
1544 HDEBUG(D_verify) debug_printf("interface=%s port=%d\n", sx->interface, sx->port);
1546 /* This puts port into host->port */
1547 sx->inblock.sock = sx->outblock.sock =
1548 smtp_connect(sx->host, sx->host_af, sx->port, sx->interface,
1549 sx->ob->connect_timeout, sx->tblock);
1551 if (sx->inblock.sock < 0)
1553 uschar * msg = NULL;
1556 msg = US strerror(errno);
1557 HDEBUG(D_verify) debug_printf("connect: %s\n", msg);
1559 set_errno_nohost(sx->addrlist,
1560 errno == ETIMEDOUT ? ERRNO_CONNECTTIMEOUT : errno,
1561 sx->verify ? string_sprintf("could not connect: %s", msg)
1564 sx->send_quit = FALSE;
1568 #if defined(SUPPORT_TLS) && defined(EXPERIMENTAL_DANE)
1570 tls_out.dane_verified = FALSE;
1571 tls_out.tlsa_usage = 0;
1573 if (sx->host->dnssec == DS_YES)
1575 if( sx->dane_required
1576 || verify_check_given_host(&sx->ob->hosts_try_dane, sx->host) == OK
1578 switch (rc = tlsa_lookup(sx->host, &tlsa_dnsa, sx->dane_required))
1580 case OK: sx->dane = TRUE; break;
1581 case FAIL_FORCED: break;
1582 default: set_errno_nohost(sx->addrlist, ERRNO_DNSDEFER,
1583 string_sprintf("DANE error: tlsa lookup %s",
1584 rc == DEFER ? "DEFER" : "FAIL"),
1589 else if (sx->dane_required)
1591 set_errno_nohost(sx->addrlist, ERRNO_DNSDEFER,
1592 string_sprintf("DANE error: %s lookup not DNSSEC", sx->host->name),
1598 sx->ob->tls_tempfail_tryclear = FALSE;
1602 /* Expand the greeting message while waiting for the initial response. (Makes
1603 sense if helo_data contains ${lookup dnsdb ...} stuff). The expansion is
1604 delayed till here so that $sending_interface and $sending_port are set. */
1607 if (!(sx->helo_data = expand_string(sx->helo_data)))
1609 log_write(0, LOG_MAIN|LOG_PANIC,
1610 "<%s>: failed to expand transport's helo_data value for callout: %s",
1611 sx->addrlist->address, expand_string_message);
1616 expand_string_message = NULL;
1617 if ((sx->helo_data = string_domain_utf8_to_alabel(sx->helo_data,
1618 &expand_string_message)),
1619 expand_string_message)
1621 log_write(0, LOG_MAIN|LOG_PANIC,
1622 "<%s>: failed to expand transport's helo_data value for callout: %s",
1623 sx->addrlist->address, expand_string_message);
1625 sx->helo_data = NULL;
1629 /* The first thing is to wait for an initial OK response. The dreaded "goto"
1630 is nevertheless a reasonably clean way of programming this kind of logic,
1631 where you want to escape on any error. */
1638 (void) setsockopt(sx->inblock.sock, IPPROTO_TCP, TCP_QUICKACK, US &off, sizeof(off));
1640 good_response = smtp_read_response(&sx->inblock, sx->buffer, sizeof(sx->buffer),
1641 '2', sx->ob->command_timeout);
1642 #ifdef EXPERIMENTAL_DSN_INFO
1643 sx->smtp_greeting = string_copy(sx->buffer);
1645 if (!good_response) goto RESPONSE_FAILED;
1647 #ifndef DISABLE_EVENT
1650 lookup_dnssec_authenticated = sx->host->dnssec==DS_YES ? US"yes"
1651 : sx->host->dnssec==DS_NO ? US"no" : NULL;
1652 s = event_raise(sx->tblock->event_action, US"smtp:connect", sx->buffer);
1655 set_errno_nohost(sx->addrlist, ERRNO_EXPANDFAIL,
1656 string_sprintf("deferred by smtp:connect event expansion: %s", s),
1664 /* Now check if the helo_data expansion went well, and sign off cleanly if
1669 message = string_sprintf("failed to expand helo_data: %s",
1670 expand_string_message);
1671 set_errno_nohost(sx->addrlist, ERRNO_EXPANDFAIL, message, DEFER, FALSE);
1677 /** Debugging without sending a message
1678 sx->addrlist->transport_return = DEFER;
1682 /* Errors that occur after this point follow an SMTP command, which is
1683 left in big_buffer by smtp_write_command() for use in error messages. */
1685 smtp_command = big_buffer;
1687 /* Tell the remote who we are...
1689 February 1998: A convention has evolved that ESMTP-speaking MTAs include the
1690 string "ESMTP" in their greeting lines, so make Exim send EHLO if the
1691 greeting is of this form. The assumption was that the far end supports it
1692 properly... but experience shows that there are some that give 5xx responses,
1693 even though the banner includes "ESMTP" (there's a bloody-minded one that
1694 says "ESMTP not spoken here"). Cope with that case.
1696 September 2000: Time has passed, and it seems reasonable now to always send
1697 EHLO at the start. It is also convenient to make the change while installing
1700 July 2003: Joachim Wieland met a broken server that advertises "PIPELINING"
1701 but times out after sending MAIL FROM, RCPT TO and DATA all together. There
1702 would be no way to send out the mails, so there is now a host list
1703 "hosts_avoid_esmtp" that disables ESMTP for special hosts and solves the
1704 PIPELINING problem as well. Maybe it can also be useful to cure other
1705 problems with broken servers.
1707 Exim originally sent "Helo" at this point and ran for nearly a year that way.
1708 Then somebody tried it with a Microsoft mailer... It seems that all other
1709 mailers use upper case for some reason (the RFC is quite clear about case
1710 independence) so, for peace of mind, I gave in. */
1712 sx->esmtp = verify_check_given_host(&sx->ob->hosts_avoid_esmtp, sx->host) != OK;
1714 /* Alas; be careful, since this goto is not an error-out, so conceivably
1715 we might set data between here and the target which we assume to exist
1716 and be usable. I can see this coming back to bite us. */
1720 smtp_peer_options |= PEER_OFFERED_TLS;
1721 suppress_tls = FALSE;
1722 sx->ob->tls_tempfail_tryclear = FALSE;
1723 smtp_command = US"SSL-on-connect";
1730 if (smtp_write_command(&sx->outblock, FALSE, "%s %s\r\n",
1731 sx->lmtp ? "LHLO" : "EHLO", sx->helo_data) < 0)
1733 sx->esmtp_sent = TRUE;
1734 if (!smtp_read_response(&sx->inblock, sx->buffer, sizeof(sx->buffer), '2',
1735 sx->ob->command_timeout))
1737 if (errno != 0 || sx->buffer[0] == 0 || sx->lmtp)
1739 #ifdef EXPERIMENTAL_DSN_INFO
1740 sx->helo_response = string_copy(sx->buffer);
1742 goto RESPONSE_FAILED;
1746 #ifdef EXPERIMENTAL_DSN_INFO
1747 sx->helo_response = string_copy(sx->buffer);
1752 debug_printf("not sending EHLO (host matches hosts_avoid_esmtp)\n");
1757 int n = sizeof(sx->buffer);
1758 uschar * rsp = sx->buffer;
1760 if (sx->esmtp_sent && (n = Ustrlen(sx->buffer)) < sizeof(sx->buffer)/2)
1761 { rsp = sx->buffer + n + 1; n = sizeof(sx->buffer) - n; }
1763 if (smtp_write_command(&sx->outblock, FALSE, "HELO %s\r\n", sx->helo_data) < 0)
1765 good_response = smtp_read_response(&sx->inblock, rsp, n,
1766 '2', sx->ob->command_timeout);
1767 #ifdef EXPERIMENTAL_DSN_INFO
1768 sx->helo_response = string_copy(rsp);
1772 /* Handle special logging for a closed connection after HELO
1773 when had previously sent EHLO */
1775 if (rsp != sx->buffer && rsp[0] == 0 && (errno == 0 || errno == ECONNRESET))
1777 errno = ERRNO_SMTPCLOSED;
1778 goto EHLOHELO_FAILED;
1780 Ustrncpy(sx->buffer, rsp, sizeof(sx->buffer)/2);
1781 goto RESPONSE_FAILED;
1785 sx->peer_offered = smtp_peer_options = 0;
1787 if (sx->esmtp || sx->lmtp)
1789 sx->peer_offered = ehlo_response(sx->buffer,
1790 PEER_OFFERED_TLS /* others checked later */
1793 /* Set tls_offered if the response to EHLO specifies support for STARTTLS. */
1796 smtp_peer_options |= sx->peer_offered & PEER_OFFERED_TLS;
1801 /* For continuing deliveries down the same channel, the socket is the standard
1802 input, and we don't need to redo EHLO here (but may need to do so for TLS - see
1803 below). Set up the pointer to where subsequent commands will be left, for
1804 error messages. Note that smtp_peer_options will have been
1805 set from the command line if they were set in the process that passed the
1808 /*XXX continue case needs to propagate DSN_INFO, prob. in deliver.c
1809 as the continue goes via transport_pass_socket() and doublefork and exec.
1810 It does not wait. Unclear how we keep separate host's responses
1811 separate - we could match up by host ip+port as a bodge. */
1815 sx->inblock.sock = sx->outblock.sock = fileno(stdin);
1816 smtp_command = big_buffer;
1817 sx->host->port = sx->port; /* Record the port that was used */
1818 sx->helo_data = NULL; /* ensure we re-expand ob->helo_data */
1821 /* If TLS is available on this connection, whether continued or not, attempt to
1822 start up a TLS session, unless the host is in hosts_avoid_tls. If successful,
1823 send another EHLO - the server may give a different answer in secure mode. We
1824 use a separate buffer for reading the response to STARTTLS so that if it is
1825 negative, the original EHLO data is available for subsequent analysis, should
1826 the client not be required to use TLS. If the response is bad, copy the buffer
1827 for error analysis. */
1830 if ( smtp_peer_options & PEER_OFFERED_TLS
1832 && verify_check_given_host(&sx->ob->hosts_avoid_tls, sx->host) != OK
1834 || verify_check_given_host(&sx->ob->hosts_verify_avoid_tls, sx->host) != OK
1837 uschar buffer2[4096];
1838 if (smtp_write_command(&sx->outblock, FALSE, "STARTTLS\r\n") < 0)
1841 /* If there is an I/O error, transmission of this message is deferred. If
1842 there is a temporary rejection of STARRTLS and tls_tempfail_tryclear is
1843 false, we also defer. However, if there is a temporary rejection of STARTTLS
1844 and tls_tempfail_tryclear is true, or if there is an outright rejection of
1845 STARTTLS, we carry on. This means we will try to send the message in clear,
1846 unless the host is in hosts_require_tls (tested below). */
1848 if (!smtp_read_response(&sx->inblock, buffer2, sizeof(buffer2), '2',
1849 sx->ob->command_timeout))
1853 || (buffer2[0] == '4' && !sx->ob->tls_tempfail_tryclear)
1856 Ustrncpy(sx->buffer, buffer2, sizeof(sx->buffer));
1857 sx->buffer[sizeof(sx->buffer)-1] = '\0';
1858 goto RESPONSE_FAILED;
1862 /* STARTTLS accepted: try to negotiate a TLS session. */
1867 address_item * addr;
1868 int rc = tls_client_start(sx->inblock.sock, sx->host, sx->addrlist, sx->tblock
1869 # ifdef EXPERIMENTAL_DANE
1870 , sx->dane ? &tlsa_dnsa : NULL
1874 /* TLS negotiation failed; give an error. From outside, this function may
1875 be called again to try in clear on a new connection, if the options permit
1876 it for this host. */
1880 # ifdef EXPERIMENTAL_DANE
1881 if (sx->dane) log_write(0, LOG_MAIN,
1882 "DANE attempt failed; no TLS connection to %s [%s]",
1883 sx->host->name, sx->host->address);
1886 errno = ERRNO_TLSFAILURE;
1887 message = US"failure while setting up TLS session";
1888 sx->send_quit = FALSE;
1892 /* TLS session is set up */
1894 smtp_peer_options_wrap = smtp_peer_options;
1895 for (addr = sx->addrlist; addr; addr = addr->next)
1896 if (addr->transport_return == PENDING_DEFER)
1898 addr->cipher = tls_out.cipher;
1899 addr->ourcert = tls_out.ourcert;
1900 addr->peercert = tls_out.peercert;
1901 addr->peerdn = tls_out.peerdn;
1902 addr->ocsp = tls_out.ocsp;
1907 /* if smtps, we'll have smtp_command set to something else; always safe to
1909 smtp_command = big_buffer;
1911 /* If we started TLS, redo the EHLO/LHLO exchange over the secure channel. If
1912 helo_data is null, we are dealing with a connection that was passed from
1913 another process, and so we won't have expanded helo_data above. We have to
1914 expand it here. $sending_ip_address and $sending_port are set up right at the
1915 start of the Exim process (in exim.c). */
1917 if (tls_out.active >= 0)
1922 if (!sx->helo_data && !(sx->helo_data = expand_string(sx->ob->helo_data)))
1924 uschar *message = string_sprintf("failed to expand helo_data: %s",
1925 expand_string_message);
1926 set_errno_nohost(sx->addrlist, ERRNO_EXPANDFAIL, message, DEFER, FALSE);
1931 /* For SMTPS we need to wait for the initial OK response. */
1934 good_response = smtp_read_response(&sx->inblock, sx->buffer, sizeof(sx->buffer),
1935 '2', sx->ob->command_timeout);
1936 #ifdef EXPERIMENTAL_DSN_INFO
1937 sx->smtp_greeting = string_copy(sx->buffer);
1939 if (!good_response) goto RESPONSE_FAILED;
1943 greeting_cmd = "EHLO";
1946 greeting_cmd = "HELO";
1948 debug_printf("not sending EHLO (host matches hosts_avoid_esmtp)\n");
1951 if (smtp_write_command(&sx->outblock, FALSE, "%s %s\r\n",
1952 sx->lmtp ? "LHLO" : greeting_cmd, sx->helo_data) < 0)
1954 good_response = smtp_read_response(&sx->inblock, sx->buffer, sizeof(sx->buffer),
1955 '2', sx->ob->command_timeout);
1956 #ifdef EXPERIMENTAL_DSN_INFO
1957 sx->helo_response = string_copy(sx->buffer);
1959 if (!good_response) goto RESPONSE_FAILED;
1960 smtp_peer_options = 0;
1963 /* If the host is required to use a secure channel, ensure that we
1967 # ifdef EXPERIMENTAL_DANE
1970 || verify_check_given_host(&sx->ob->hosts_require_tls, sx->host) == OK
1973 errno = ERRNO_TLSREQUIRED;
1974 message = string_sprintf("a TLS session is required, but %s",
1975 smtp_peer_options & PEER_OFFERED_TLS
1976 ? "an attempt to start TLS failed" : "the server did not offer TLS support");
1979 #endif /*SUPPORT_TLS*/
1981 /* If TLS is active, we have just started it up and re-done the EHLO command,
1982 so its response needs to be analyzed. If TLS is not active and this is a
1983 continued session down a previously-used socket, we haven't just done EHLO, so
1986 if (continue_hostname == NULL
1988 || tls_out.active >= 0
1992 if (sx->esmtp || sx->lmtp)
1994 sx->peer_offered = ehlo_response(sx->buffer,
1996 | (sx->lmtp && sx->ob->lmtp_ignore_quota ? PEER_OFFERED_IGNQ : 0)
1997 | PEER_OFFERED_CHUNKING
2000 | (sx->addrlist->prop.utf8_msg ? PEER_OFFERED_UTF8 : 0)
2001 /*XXX if we hand peercaps on to continued-conn processes,
2002 must not depend on this addr */
2006 | (sx->ob->size_addition >= 0 ? PEER_OFFERED_SIZE : 0)
2009 /* Set for IGNOREQUOTA if the response to LHLO specifies support and the
2010 lmtp_ignore_quota option was set. */
2012 sx->igquotstr = sx->peer_offered & PEER_OFFERED_IGNQ ? US" IGNOREQUOTA" : US"";
2014 /* If the response to EHLO specified support for the SIZE parameter, note
2015 this, provided size_addition is non-negative. */
2017 smtp_peer_options |= sx->peer_offered & PEER_OFFERED_SIZE;
2019 /* Note whether the server supports PIPELINING. If hosts_avoid_esmtp matched
2020 the current host, esmtp will be false, so PIPELINING can never be used. If
2021 the current host matches hosts_avoid_pipelining, don't do it. */
2023 if ( sx->peer_offered & PEER_OFFERED_PIPE
2024 && verify_check_given_host(&sx->ob->hosts_avoid_pipelining, sx->host) != OK)
2025 smtp_peer_options |= PEER_OFFERED_PIPE;
2027 DEBUG(D_transport) debug_printf("%susing PIPELINING\n",
2028 smtp_peer_options & PEER_OFFERED_PIPE ? "" : "not ");
2030 if ( sx->peer_offered & PEER_OFFERED_CHUNKING
2031 && verify_check_given_host(&sx->ob->hosts_try_chunking, sx->host) != OK)
2032 sx->peer_offered &= ~PEER_OFFERED_CHUNKING;
2034 if (sx->peer_offered & PEER_OFFERED_CHUNKING)
2035 {DEBUG(D_transport) debug_printf("CHUNKING usable\n");}
2037 #ifndef DISABLE_PRDR
2038 if ( sx->peer_offered & PEER_OFFERED_PRDR
2039 && verify_check_given_host(&sx->ob->hosts_try_prdr, sx->host) != OK)
2040 sx->peer_offered &= ~PEER_OFFERED_PRDR;
2042 if (sx->peer_offered & PEER_OFFERED_PRDR)
2043 {DEBUG(D_transport) debug_printf("PRDR usable\n");}
2046 /* Note if the server supports DSN */
2047 smtp_peer_options |= sx->peer_offered & PEER_OFFERED_DSN;
2048 DEBUG(D_transport) debug_printf("%susing DSN\n",
2049 sx->peer_offered & PEER_OFFERED_DSN ? "" : "not ");
2051 /* Note if the response to EHLO specifies support for the AUTH extension.
2052 If it has, check that this host is one we want to authenticate to, and do
2053 the business. The host name and address must be available when the
2054 authenticator's client driver is running. */
2056 switch (yield = smtp_auth(sx->buffer, sizeof(sx->buffer), sx->addrlist, sx->host,
2057 sx->ob, sx->esmtp, &sx->inblock, &sx->outblock))
2059 default: goto SEND_QUIT;
2061 case FAIL_SEND: goto SEND_FAILED;
2062 case FAIL: goto RESPONSE_FAILED;
2066 pipelining_active = !!(smtp_peer_options & PEER_OFFERED_PIPE);
2068 /* The setting up of the SMTP call is now complete. Any subsequent errors are
2069 message-specific. */
2071 sx->setting_up = FALSE;
2074 if (sx->addrlist->prop.utf8_msg)
2076 sx->utf8_needed = !sx->addrlist->prop.utf8_downcvt
2077 && !sx->addrlist->prop.utf8_downcvt_maybe;
2078 DEBUG(D_transport) if (!sx->utf8_needed)
2079 debug_printf("utf8: %s downconvert\n",
2080 sx->addrlist->prop.utf8_downcvt ? "mandatory" : "optional");
2083 /* If this is an international message we need the host to speak SMTPUTF8 */
2084 if (sx->utf8_needed && !(sx->peer_offered & PEER_OFFERED_UTF8))
2086 errno = ERRNO_UTF8_FWD;
2087 goto RESPONSE_FAILED;
2099 sx->send_quit = check_response(sx->host, &errno, sx->addrlist->more_errno,
2100 sx->buffer, &code, &message, &pass_message);
2105 message = US string_sprintf("send() to %s [%s] failed: %s",
2106 sx->host->name, sx->host->address, strerror(errno));
2107 sx->send_quit = FALSE;
2110 /* This label is jumped to directly when a TLS negotiation has failed,
2111 or was not done for a host for which it is required. Values will be set
2112 in message and errno, and setting_up will always be true. Treat as
2113 a temporary error. */
2117 message = string_sprintf("Remote host closed connection in response to %s"
2118 " (EHLO response was: %s)", smtp_command, sx->buffer);
2119 sx->send_quit = FALSE;
2128 /* The failure happened while setting up the call; see if the failure was
2129 a 5xx response (this will either be on connection, or following HELO - a 5xx
2130 after EHLO causes it to try HELO). If so, fail all addresses, as this host is
2131 never going to accept them. For other errors during setting up (timeouts or
2132 whatever), defer all addresses, and yield DEFER, so that the host is not
2133 tried again for a while. */
2136 sx->ok = FALSE; /* For when reached by GOTO */
2140 || errno == ERRNO_UTF8_FWD
2144 set_errno(sx->addrlist, errno, message, yield, pass_message, sx->host
2145 #ifdef EXPERIMENTAL_DSN_INFO
2146 , sx->smtp_greeting, sx->helo_response
2155 (void)smtp_write_command(&sx->outblock, FALSE, "QUIT\r\n");
2158 tls_close(FALSE, TRUE);
2161 /* Close the socket, and return the appropriate value, first setting
2162 works because the NULL setting is passed back to the calling process, and
2163 remote_max_parallel is forced to 1 when delivering over an existing connection,
2165 If all went well and continue_more is set, we shouldn't actually get here if
2166 there are further addresses, as the return above will be taken. However,
2167 writing RSET might have failed, or there may be other addresses whose hosts are
2168 specified in the transports, and therefore not visible at top level, in which
2169 case continue_more won't get set. */
2171 HDEBUG(D_transport|D_acl|D_v) debug_printf_indent(" SMTP(close)>>\n");
2174 shutdown(sx->outblock.sock, SHUT_WR);
2175 if (fcntl(sx->inblock.sock, F_SETFL, O_NONBLOCK) == 0)
2176 for (rc = 16; read(sx->inblock.sock, sx->inbuffer, sizeof(sx->inbuffer)) > 0 && rc > 0;)
2177 rc--; /* drain socket */
2178 sx->send_quit = FALSE;
2180 (void)close(sx->inblock.sock);
2181 sx->inblock.sock = sx->outblock.sock = -1;
2183 #ifndef DISABLE_EVENT
2184 (void) event_raise(sx->tblock->event_action, US"tcp:close", NULL);
2187 continue_transport = NULL;
2188 continue_hostname = NULL;
2195 /* Create the string of options that will be appended to the MAIL FROM:
2196 in the connection context buffer */
2199 build_mailcmd_options(smtp_context * sx, address_item * addrlist)
2201 uschar * p = sx->buffer;
2202 address_item * addr;
2207 /* If we know the receiving MTA supports the SIZE qualification,
2208 send it, adding something to the message size to allow for imprecision
2209 and things that get added en route. Exim keeps the number of lines
2210 in a message, so we can give an accurate value for the original message, but we
2211 need some additional to handle added headers. (Double "." characters don't get
2212 included in the count.) */
2214 if (sx->peer_offered & PEER_OFFERED_SIZE)
2216 sprintf(CS p, " SIZE=%d", message_size+message_linecount+sx->ob->size_addition);
2220 #ifndef DISABLE_PRDR
2221 /* If it supports Per-Recipient Data Reponses, and we have omre than one recipient,
2224 sx->prdr_active = FALSE;
2225 if (sx->peer_offered & PEER_OFFERED_PRDR)
2226 for (addr = addrlist; addr; addr = addr->next)
2227 if (addr->transport_return == PENDING_DEFER)
2229 for (addr = addr->next; addr; addr = addr->next)
2230 if (addr->transport_return == PENDING_DEFER)
2231 { /* at least two recipients to send */
2232 sx->prdr_active = TRUE;
2233 sprintf(CS p, " PRDR"); p += 5;
2241 /* If it supports internationalised messages, and this meesage need that,
2244 if ( sx->peer_offered & PEER_OFFERED_UTF8
2245 && addrlist->prop.utf8_msg
2246 && !addrlist->prop.utf8_downcvt
2248 Ustrcpy(p, " SMTPUTF8"), p += 9;
2251 /* check if all addresses have DSN-lasthop flag; do not send RET and ENVID if so */
2252 for (sx->dsn_all_lasthop = TRUE, addr = addrlist, address_count = 0;
2253 addr && address_count < sx->max_rcpt;
2254 addr = addr->next) if (addr->transport_return == PENDING_DEFER)
2257 if (!(addr->dsn_flags & rf_dsnlasthop))
2259 sx->dsn_all_lasthop = FALSE;
2264 /* Add any DSN flags to the mail command */
2266 if (sx->peer_offered & PEER_OFFERED_DSN && !sx->dsn_all_lasthop)
2268 if (dsn_ret == dsn_ret_hdrs)
2269 { Ustrcpy(p, " RET=HDRS"); p += 9; }
2270 else if (dsn_ret == dsn_ret_full)
2271 { Ustrcpy(p, " RET=FULL"); p += 9; }
2275 string_format(p, sizeof(sx->buffer) - (p-sx->buffer), " ENVID=%s", dsn_envid);
2280 /* If an authenticated_sender override has been specified for this transport
2281 instance, expand it. If the expansion is forced to fail, and there was already
2282 an authenticated_sender for this message, the original value will be used.
2283 Other expansion failures are serious. An empty result is ignored, but there is
2284 otherwise no check - this feature is expected to be used with LMTP and other
2285 cases where non-standard addresses (e.g. without domains) might be required. */
2287 if (smtp_mail_auth_str(p, sizeof(sx->buffer) - (p-sx->buffer), addrlist, sx->ob))
2295 build_rcptcmd_options(smtp_context * sx, const address_item * addr)
2297 uschar * p = sx->buffer;
2300 /* Add any DSN flags to the rcpt command */
2302 if (sx->peer_offered & PEER_OFFERED_DSN && !(addr->dsn_flags & rf_dsnlasthop))
2304 if (addr->dsn_flags & rf_dsnflags)
2309 Ustrcpy(p, " NOTIFY=");
2311 for (i = 0; i < nelem(rf_list); i++) if (addr->dsn_flags & rf_list[i])
2313 if (!first) *p++ = ',';
2315 Ustrcpy(p, rf_names[i]);
2320 if (addr->dsn_orcpt)
2322 string_format(p, sizeof(sx->buffer) - (p-sx->buffer), " ORCPT=%s",
2333 0 good, rcpt results in addr->transport_return (PENDING_OK, DEFER, FAIL)
2334 -1 MAIL response error
2335 -2 any non-MAIL read i/o error
2336 -3 non-MAIL response timeout
2337 -4 internal error; channel still usable
2342 smtp_write_mail_and_rcpt_cmds(smtp_context * sx, int * yield)
2344 address_item * addr;
2348 if (build_mailcmd_options(sx, sx->first_addr) != OK)
2354 /* From here until we send the DATA command, we can make use of PIPELINING
2355 if the server host supports it. The code has to be able to check the responses
2356 at any point, for when the buffer fills up, so we write it totally generally.
2357 When PIPELINING is off, each command written reports that it has flushed the
2360 sx->pending_MAIL = TRUE; /* The block starts with MAIL */
2363 uschar * s = sx->from_addr;
2365 uschar * errstr = NULL;
2367 /* If we must downconvert, do the from-address here. Remember we had to
2368 for the to-addresses (done below), and also (ugly) for re-doing when building
2369 the delivery log line. */
2371 if ( sx->addrlist->prop.utf8_msg
2372 && (sx->addrlist->prop.utf8_downcvt || !(sx->peer_offered & PEER_OFFERED_UTF8))
2375 if (s = string_address_utf8_to_alabel(s, &errstr), errstr)
2377 set_errno_nohost(sx->addrlist, ERRNO_EXPANDFAIL, errstr, DEFER, FALSE);
2381 setflag(sx->addrlist, af_utf8_downcvt);
2385 rc = smtp_write_command(&sx->outblock, pipelining_active,
2386 "MAIL FROM:<%s>%s\r\n", s, sx->buffer);
2389 mail_command = string_copy(big_buffer); /* Save for later error message */
2393 case -1: /* Transmission error */
2396 case +1: /* Cmd was sent */
2397 if (!smtp_read_response(&sx->inblock, sx->buffer, sizeof(sx->buffer), '2',
2398 sx->ob->command_timeout))
2400 if (errno == 0 && sx->buffer[0] == '4')
2402 errno = ERRNO_MAIL4XX;
2403 sx->addrlist->more_errno |= ((sx->buffer[1] - '0')*10 + sx->buffer[2] - '0') << 8;
2407 sx->pending_MAIL = FALSE;
2410 /* otherwise zero: command queued for pipeline */
2413 /* Pass over all the relevant recipient addresses for this host, which are the
2414 ones that have status PENDING_DEFER. If we are using PIPELINING, we can send
2415 several before we have to read the responses for those seen so far. This
2416 checking is done by a subroutine because it also needs to be done at the end.
2417 Send only up to max_rcpt addresses at a time, leaving next_addr pointing to
2418 the next one if not all are sent.
2420 In the MUA wrapper situation, we want to flush the PIPELINING buffer for the
2421 last address because we want to abort if any recipients have any kind of
2422 problem, temporary or permanent. We know that all recipient addresses will have
2423 the PENDING_DEFER status, because only one attempt is ever made, and we know
2424 that max_rcpt will be large, so all addresses will be done at once.
2426 For verify we flush the pipeline after any (the only) rcpt address. */
2428 for (addr = sx->first_addr, address_count = 0;
2429 addr && address_count < sx->max_rcpt;
2430 addr = addr->next) if (addr->transport_return == PENDING_DEFER)
2436 addr->dsn_aware = sx->peer_offered & PEER_OFFERED_DSN
2437 ? dsn_support_yes : dsn_support_no;
2440 no_flush = pipelining_active && !sx->verify
2441 && (!mua_wrapper || addr->next && address_count < sx->max_rcpt);
2443 build_rcptcmd_options(sx, addr);
2445 /* Now send the RCPT command, and process outstanding responses when
2446 necessary. After a timeout on RCPT, we just end the function, leaving the
2447 yield as OK, because this error can often mean that there is a problem with
2448 just one address, so we don't want to delay the host. */
2450 rcpt_addr = transport_rcpt_address(addr, sx->tblock->rcpt_include_affixes);
2453 if ( testflag(sx->addrlist, af_utf8_downcvt)
2454 && !(rcpt_addr = string_address_utf8_to_alabel(rcpt_addr, NULL))
2457 /*XXX could we use a per-address errstr here? Not fail the whole send? */
2458 errno = ERRNO_EXPANDFAIL;
2459 return -5; /*XXX too harsh? */
2463 count = smtp_write_command(&sx->outblock, no_flush, "RCPT TO:<%s>%s%s\r\n",
2464 rcpt_addr, sx->igquotstr, sx->buffer);
2466 if (count < 0) return -5;
2469 switch(sync_responses(sx, count, 0))
2471 case 3: sx->ok = TRUE; /* 2xx & 5xx => OK & progress made */
2472 case 2: sx->completed_addr = TRUE; /* 5xx (only) => progress made */
2475 case 1: sx->ok = TRUE; /* 2xx (only) => OK, but if LMTP, */
2476 if (!sx->lmtp) /* can't tell about progress yet */
2477 sx->completed_addr = TRUE;
2478 case 0: /* No 2xx or 5xx, but no probs */
2481 case -1: return -3; /* Timeout on RCPT */
2482 case -2: return -2; /* non-MAIL read i/o error */
2483 default: return -1; /* any MAIL error */
2485 sx->pending_MAIL = FALSE; /* Dealt with MAIL */
2487 } /* Loop for next address */
2489 sx->next_addr = addr;
2494 /*************************************************
2495 * Deliver address list to given host *
2496 *************************************************/
2498 /* If continue_hostname is not null, we get here only when continuing to
2499 deliver down an existing channel. The channel was passed as the standard
2500 input. TLS is never active on a passed channel; the previous process always
2501 closes it down before passing the connection on.
2503 Otherwise, we have to make a connection to the remote host, and do the
2504 initial protocol exchange.
2506 When running as an MUA wrapper, if the sender or any recipient is rejected,
2507 temporarily or permanently, we force failure for all recipients.
2510 addrlist chain of potential addresses to deliver; only those whose
2511 transport_return field is set to PENDING_DEFER are currently
2512 being processed; others should be skipped - they have either
2513 been delivered to an earlier host or IP address, or been
2514 failed by one of them.
2515 host host to deliver to
2516 host_af AF_INET or AF_INET6
2517 port default TCP/IP port to use, in host byte order
2518 interface interface to bind to, or NULL
2519 tblock transport instance block
2520 message_defer set TRUE if yield is OK, but all addresses were deferred
2521 because of a non-recipient, non-host failure, that is, a
2522 4xx response to MAIL FROM, DATA, or ".". This is a defer
2523 that is specific to the message.
2524 suppress_tls if TRUE, don't attempt a TLS connection - this is set for
2525 a second attempt after TLS initialization fails
2527 Returns: OK - the connection was made and the delivery attempted;
2528 the result for each address is in its data block.
2529 DEFER - the connection could not be made, or something failed
2530 while setting up the SMTP session, or there was a
2531 non-message-specific error, such as a timeout.
2532 ERROR - a filter command is specified for this transport,
2533 and there was a problem setting it up; OR helo_data
2534 or add_headers or authenticated_sender is specified
2535 for this transport, and the string failed to expand
2539 smtp_deliver(address_item *addrlist, host_item *host, int host_af, int port,
2540 uschar *interface, transport_instance *tblock,
2541 BOOL *message_defer, BOOL suppress_tls)
2547 time_t start_delivery_time = time(NULL);
2549 BOOL pass_message = FALSE;
2550 uschar *message = NULL;
2551 uschar new_message_id[MESSAGE_ID_LENGTH + 1];
2556 suppress_tls = suppress_tls; /* stop compiler warning when no TLS support */
2557 *message_defer = FALSE;
2559 sx.addrlist = addrlist;
2561 sx.host_af = host_af,
2563 sx.interface = interface;
2564 sx.helo_data = NULL;
2568 /* Get the channel set up ready for a message (MAIL FROM being the next
2569 SMTP command to send */
2571 if ((rc = smtp_setup_conn(&sx, suppress_tls)) != OK)
2574 /* If there is a filter command specified for this transport, we can now
2575 set it up. This cannot be done until the identify of the host is known. */
2577 if (tblock->filter_command)
2581 sprintf(CS fbuf, "%.50s transport", tblock->name);
2582 rc = transport_set_up_command(&transport_filter_argv, tblock->filter_command,
2583 TRUE, DEFER, addrlist, fbuf, NULL);
2584 transport_filter_timeout = tblock->filter_timeout;
2586 /* On failure, copy the error to all addresses, abandon the SMTP call, and
2591 set_errno_nohost(addrlist->next, addrlist->basic_errno, addrlist->message, DEFER,
2597 if ( transport_filter_argv
2598 && *transport_filter_argv
2599 && **transport_filter_argv
2600 && sx.peer_offered & PEER_OFFERED_CHUNKING
2603 sx.peer_offered &= ~PEER_OFFERED_CHUNKING;
2604 DEBUG(D_transport) debug_printf("CHUNKING not usable due to transport filter\n");
2609 /* For messages that have more than the maximum number of envelope recipients,
2610 we want to send several transactions down the same SMTP connection. (See
2611 comments in deliver.c as to how this reconciles, heuristically, with
2612 remote_max_parallel.) This optimization was added to Exim after the following
2613 code was already working. The simplest way to put it in without disturbing the
2614 code was to use a goto to jump back to this point when there is another
2615 transaction to handle. */
2618 sx.from_addr = return_path;
2619 sx.first_addr = sx.sync_addr = addrlist;
2621 sx.send_rset = TRUE;
2622 sx.completed_addr = FALSE;
2625 /* Initiate a message transfer. */
2627 switch(smtp_write_mail_and_rcpt_cmds(&sx, &yield))
2630 case -1: case -2: goto RESPONSE_FAILED;
2631 case -3: goto END_OFF;
2632 case -4: goto SEND_QUIT;
2633 default: goto SEND_FAILED;
2636 /* If we are an MUA wrapper, abort if any RCPTs were rejected, either
2637 permanently or temporarily. We should have flushed and synced after the last
2645 for (a = sx.first_addr, cnt = 0; a && cnt < sx.max_rcpt; a = a->next, cnt++)
2646 if (a->transport_return != PENDING_OK)
2648 /*XXX could we find a better errno than 0 here? */
2649 set_errno_nohost(addrlist, 0, a->message, FAIL,
2650 testflag(a, af_pass_message));
2656 /* If ok is TRUE, we know we have got at least one good recipient, and must now
2657 send DATA, but if it is FALSE (in the normal, non-wrapper case), we may still
2658 have a good recipient buffered up if we are pipelining. We don't want to waste
2659 time sending DATA needlessly, so we only send it if either ok is TRUE or if we
2660 are pipelining. The responses are all handled by sync_responses().
2661 If using CHUNKING, do not send a BDAT until we know how big a chunk we want
2664 if ( !(sx.peer_offered & PEER_OFFERED_CHUNKING)
2665 && (sx.ok || (pipelining_active && !mua_wrapper)))
2667 int count = smtp_write_command(&sx.outblock, FALSE, "DATA\r\n");
2669 if (count < 0) goto SEND_FAILED;
2670 switch(sync_responses(&sx, count, sx.ok ? +1 : -1))
2672 case 3: sx.ok = TRUE; /* 2xx & 5xx => OK & progress made */
2673 case 2: sx.completed_addr = TRUE; /* 5xx (only) => progress made */
2676 case 1: sx.ok = TRUE; /* 2xx (only) => OK, but if LMTP, */
2677 if (!sx.lmtp) sx.completed_addr = TRUE; /* can't tell about progress yet */
2678 case 0: break; /* No 2xx or 5xx, but no probs */
2680 case -1: goto END_OFF; /* Timeout on RCPT */
2681 default: goto RESPONSE_FAILED; /* I/O error, or any MAIL/DATA error */
2683 pipelining_active = FALSE;
2684 data_command = string_copy(big_buffer); /* Save for later error message */
2687 /* If there were no good recipients (but otherwise there have been no
2688 problems), just set ok TRUE, since we have handled address-specific errors
2689 already. Otherwise, it's OK to send the message. Use the check/escape mechanism
2690 for handling the SMTP dot-handling protocol, flagging to apply to headers as
2691 well as body. Set the appropriate timeout value to be used for each chunk.
2692 (Haven't been able to make it work using select() for writing yet.) */
2694 if (!(sx.peer_offered & PEER_OFFERED_CHUNKING) && !sx.ok)
2696 /* Save the first address of the next batch. */
2697 sx.first_addr = sx.next_addr;
2703 transport_ctx tctx = {
2706 US".", US"..", /* Escaping strings */
2707 topt_use_crlf | topt_escape_headers
2708 | (tblock->body_only ? topt_no_headers : 0)
2709 | (tblock->headers_only ? topt_no_body : 0)
2710 | (tblock->return_path_add ? topt_add_return_path : 0)
2711 | (tblock->delivery_date_add ? topt_add_delivery_date : 0)
2712 | (tblock->envelope_to_add ? topt_add_envelope_to : 0)
2715 /* If using CHUNKING we need a callback from the generic transport
2716 support to us, for the sending of BDAT smtp commands and the reaping
2717 of responses. The callback needs a whole bunch of state so set up
2718 a transport-context structure to be passed around. */
2720 if (sx.peer_offered & PEER_OFFERED_CHUNKING)
2722 tctx.check_string = tctx.escape_string = NULL;
2723 tctx.options |= topt_use_bdat;
2724 tctx.chunk_cb = smtp_chunk_cmd_callback;
2725 sx.pending_BDAT = FALSE;
2726 sx.good_RCPT = sx.ok;
2728 tctx.smtp_context = &sx;
2731 tctx.options |= topt_end_dot;
2733 /* Save the first address of the next batch. */
2734 sx.first_addr = sx.next_addr;
2736 /* Responses from CHUNKING commands go in buffer. Otherwise,
2737 there has not been a response. */
2741 sigalrm_seen = FALSE;
2742 transport_write_timeout = sx.ob->data_timeout;
2743 smtp_command = US"sending data block"; /* For error messages */
2744 DEBUG(D_transport|D_v)
2745 if (sx.peer_offered & PEER_OFFERED_CHUNKING)
2746 debug_printf(" will write message using CHUNKING\n");
2748 debug_printf(" SMTP>> writing message and terminating \".\"\n");
2749 transport_count = 0;
2751 #ifndef DISABLE_DKIM
2752 sx.ok = dkim_transport_write_message(sx.inblock.sock, &tctx, &sx.ob->dkim);
2754 sx.ok = transport_write_message(sx.inblock.sock, &tctx, 0);
2757 /* transport_write_message() uses write() because it is called from other
2758 places to write to non-sockets. This means that under some OS (e.g. Solaris)
2759 it can exit with "Broken pipe" as its error. This really means that the
2760 socket got closed at the far end. */
2762 transport_write_timeout = 0; /* for subsequent transports */
2764 /* Failure can either be some kind of I/O disaster (including timeout),
2765 or the failure of a transport filter or the expansion of added headers.
2766 Or, when CHUNKING, it can be a protocol-detected failure. */
2769 goto RESPONSE_FAILED;
2771 /* We used to send the terminating "." explicitly here, but because of
2772 buffering effects at both ends of TCP/IP connections, you don't gain
2773 anything by keeping it separate, so it might as well go in the final
2774 data buffer for efficiency. This is now done by setting the topt_end_dot
2777 smtp_command = US"end of data";
2779 if (sx.peer_offered & PEER_OFFERED_CHUNKING && sx.cmd_count > 1)
2781 /* Reap any outstanding MAIL & RCPT commands, but not a DATA-go-ahead */
2782 switch(sync_responses(&sx, sx.cmd_count-1, 0))
2784 case 3: sx.ok = TRUE; /* 2xx & 5xx => OK & progress made */
2785 case 2: sx.completed_addr = TRUE; /* 5xx (only) => progress made */
2788 case 1: sx.ok = TRUE; /* 2xx (only) => OK, but if LMTP, */
2789 if (!sx.lmtp) sx.completed_addr = TRUE; /* can't tell about progress yet */
2790 case 0: break; /* No 2xx or 5xx, but no probs */
2792 case -1: goto END_OFF; /* Timeout on RCPT */
2793 default: goto RESPONSE_FAILED; /* I/O error, or any MAIL/DATA error */
2797 #ifndef DISABLE_PRDR
2798 /* For PRDR we optionally get a partial-responses warning
2799 * followed by the individual responses, before going on with
2800 * the overall response. If we don't get the warning then deal
2801 * with per non-PRDR. */
2804 sx.ok = smtp_read_response(&sx.inblock, sx.buffer, sizeof(sx.buffer), '3',
2805 sx.ob->final_timeout);
2806 if (!sx.ok && errno == 0) switch(sx.buffer[0])
2808 case '2': sx.prdr_active = FALSE;
2811 case '4': errno = ERRNO_DATA4XX;
2812 addrlist->more_errno |=
2813 ((sx.buffer[1] - '0')*10 + sx.buffer[2] - '0') << 8;
2820 /* For non-PRDR SMTP, we now read a single response that applies to the
2821 whole message. If it is OK, then all the addresses have been delivered. */
2825 sx.ok = smtp_read_response(&sx.inblock, sx.buffer, sizeof(sx.buffer), '2',
2826 sx.ob->final_timeout);
2827 if (!sx.ok && errno == 0 && sx.buffer[0] == '4')
2829 errno = ERRNO_DATA4XX;
2830 addrlist->more_errno |= ((sx.buffer[1] - '0')*10 + sx.buffer[2] - '0') << 8;
2834 /* For LMTP, we get back a response for every RCPT command that we sent;
2835 some may be accepted and some rejected. For those that get a response, their
2836 status is fixed; any that are accepted have been handed over, even if later
2837 responses crash - at least, that's how I read RFC 2033.
2839 If all went well, mark the recipient addresses as completed, record which
2840 host/IPaddress they were delivered to, and cut out RSET when sending another
2841 message down the same channel. Write the completed addresses to the journal
2842 now so that they are recorded in case there is a crash of hardware or
2843 software before the spool gets updated. Also record the final SMTP
2844 confirmation if needed (for SMTP only). */
2849 int delivery_time = (int)(time(NULL) - start_delivery_time);
2851 uschar *conf = NULL;
2853 sx.send_rset = FALSE;
2854 pipelining_active = FALSE;
2856 /* Set up confirmation if needed - applies only to SMTP */
2859 #ifdef DISABLE_EVENT
2860 LOGGING(smtp_confirmation) &&
2865 const uschar *s = string_printing(sx.buffer);
2866 /* deconst cast ok here as string_printing was checked to have alloc'n'copied */
2867 conf = (s == sx.buffer)? (uschar *)string_copy(s) : US s;
2870 /* Process all transported addresses - for LMTP or PRDR, read a status for
2873 for (addr = addrlist; addr != sx.first_addr; addr = addr->next)
2875 if (addr->transport_return != PENDING_OK) continue;
2877 /* LMTP - if the response fails badly (e.g. timeout), use it for all the
2878 remaining addresses. Otherwise, it's a return code for just the one
2879 address. For temporary errors, add a retry item for the address so that
2880 it doesn't get tried again too soon. */
2882 #ifndef DISABLE_PRDR
2883 if (sx.lmtp || sx.prdr_active)
2888 if (!smtp_read_response(&sx.inblock, sx.buffer, sizeof(sx.buffer), '2',
2889 sx.ob->final_timeout))
2891 if (errno != 0 || sx.buffer[0] == 0) goto RESPONSE_FAILED;
2892 addr->message = string_sprintf(
2893 #ifndef DISABLE_PRDR
2894 "%s error after %s: %s", sx.prdr_active ? "PRDR":"LMTP",
2896 "LMTP error after %s: %s",
2898 data_command, string_printing(sx.buffer));
2899 setflag(addr, af_pass_message); /* Allow message to go to user */
2900 if (sx.buffer[0] == '5')
2901 addr->transport_return = FAIL;
2904 errno = ERRNO_DATA4XX;
2905 addr->more_errno |= ((sx.buffer[1] - '0')*10 + sx.buffer[2] - '0') << 8;
2906 addr->transport_return = DEFER;
2907 #ifndef DISABLE_PRDR
2908 if (!sx.prdr_active)
2910 retry_add_item(addr, addr->address_retry_key, 0);
2914 sx.completed_addr = TRUE; /* NOW we can set this flag */
2915 if (LOGGING(smtp_confirmation))
2917 const uschar *s = string_printing(sx.buffer);
2918 /* deconst cast ok here as string_printing was checked to have alloc'n'copied */
2919 conf = (s == sx.buffer) ? US string_copy(s) : US s;
2923 /* SMTP, or success return from LMTP for this address. Pass back the
2924 actual host that was used. */
2926 addr->transport_return = OK;
2927 addr->more_errno = delivery_time;
2928 addr->host_used = host;
2929 addr->special_action = flag;
2930 addr->message = conf;
2931 #ifndef DISABLE_PRDR
2932 if (sx.prdr_active) addr->flags |= af_prdr_used;
2934 if (sx.peer_offered & PEER_OFFERED_CHUNKING) addr->flags |= af_chunking_used;
2937 #ifndef DISABLE_PRDR
2938 if (!sx.prdr_active)
2941 /* Update the journal. For homonymic addresses, use the base address plus
2942 the transport name. See lots of comments in deliver.c about the reasons
2943 for the complications when homonyms are involved. Just carry on after
2944 write error, as it may prove possible to update the spool file later. */
2946 if (testflag(addr, af_homonym))
2947 sprintf(CS sx.buffer, "%.500s/%s\n", addr->unique + 3, tblock->name);
2949 sprintf(CS sx.buffer, "%.500s\n", addr->unique);
2951 DEBUG(D_deliver) debug_printf("journalling %s\n", sx.buffer);
2952 len = Ustrlen(CS sx.buffer);
2953 if (write(journal_fd, sx.buffer, len) != len)
2954 log_write(0, LOG_MAIN|LOG_PANIC, "failed to write journal for "
2955 "%s: %s", sx.buffer, strerror(errno));
2959 #ifndef DISABLE_PRDR
2962 /* PRDR - get the final, overall response. For any non-success
2963 upgrade all the address statuses. */
2964 sx.ok = smtp_read_response(&sx.inblock, sx.buffer, sizeof(sx.buffer), '2',
2965 sx.ob->final_timeout);
2968 if(errno == 0 && sx.buffer[0] == '4')
2970 errno = ERRNO_DATA4XX;
2971 addrlist->more_errno |= ((sx.buffer[1] - '0')*10 + sx.buffer[2] - '0') << 8;
2973 for (addr = addrlist; addr != sx.first_addr; addr = addr->next)
2974 if (sx.buffer[0] == '5' || addr->transport_return == OK)
2975 addr->transport_return = PENDING_OK; /* allow set_errno action */
2976 goto RESPONSE_FAILED;
2979 /* Update the journal, or setup retry. */
2980 for (addr = addrlist; addr != sx.first_addr; addr = addr->next)
2981 if (addr->transport_return == OK)
2983 if (testflag(addr, af_homonym))
2984 sprintf(CS sx.buffer, "%.500s/%s\n", addr->unique + 3, tblock->name);
2986 sprintf(CS sx.buffer, "%.500s\n", addr->unique);
2988 DEBUG(D_deliver) debug_printf("journalling(PRDR) %s\n", sx.buffer);
2989 len = Ustrlen(CS sx.buffer);
2990 if (write(journal_fd, sx.buffer, len) != len)
2991 log_write(0, LOG_MAIN|LOG_PANIC, "failed to write journal for "
2992 "%s: %s", sx.buffer, strerror(errno));
2994 else if (addr->transport_return == DEFER)
2995 retry_add_item(addr, addr->address_retry_key, -2);
2999 /* Ensure the journal file is pushed out to disk. */
3001 if (EXIMfsync(journal_fd) < 0)
3002 log_write(0, LOG_MAIN|LOG_PANIC, "failed to fsync journal: %s",
3008 /* Handle general (not specific to one address) failures here. The value of ok
3009 is used to skip over this code on the falling through case. A timeout causes a
3010 deferral. Other errors may defer or fail according to the response code, and
3011 may set up a special errno value, e.g. after connection chopped, which is
3012 assumed if errno == 0 and there is no text in the buffer. If control reaches
3013 here during the setting up phase (i.e. before MAIL FROM) then always defer, as
3014 the problem is not related to this specific message. */
3019 uschar * set_message;
3025 sx.send_quit = check_response(host, &save_errno, addrlist->more_errno,
3026 sx.buffer, &code, &message, &pass_message);
3034 message = US string_sprintf("send() to %s [%s] failed: %s",
3035 host->name, host->address, strerror(save_errno));
3036 sx.send_quit = FALSE;
3044 sx.ok = FALSE; /* For when reached by GOTO */
3045 set_message = message;
3047 /* We want to handle timeouts after MAIL or "." and loss of connection after
3048 "." specially. They can indicate a problem with the sender address or with
3049 the contents of the message rather than a real error on the connection. These
3050 cases are treated in the same way as a 4xx response. This next bit of code
3051 does the classification. */
3058 message_error = TRUE;
3062 message_error = Ustrncmp(smtp_command,"MAIL",4) == 0 ||
3063 Ustrncmp(smtp_command,"end ",4) == 0;
3066 case ERRNO_SMTPCLOSED:
3067 message_error = Ustrncmp(smtp_command,"end ",4) == 0;
3071 message_error = FALSE;
3075 /* Handle the cases that are treated as message errors. These are:
3077 (a) negative response or timeout after MAIL
3078 (b) negative response after DATA
3079 (c) negative response or timeout or dropped connection after "."
3080 (d) utf8 support required and not offered
3082 It won't be a negative response or timeout after RCPT, as that is dealt
3083 with separately above. The action in all cases is to set an appropriate
3084 error code for all the addresses, but to leave yield set to OK because the
3085 host itself has not failed. Of course, it might in practice have failed
3086 when we've had a timeout, but if so, we'll discover that at the next
3087 delivery attempt. For a temporary error, set the message_defer flag, and
3088 write to the logs for information if this is not the last host. The error
3089 for the last host will be logged as part of the address's log line. */
3093 if (mua_wrapper) code = '5'; /* Force hard failure in wrapper mode */
3095 /* If there's an errno, the message contains just the identity of
3100 else /* Anything other than 5 is treated as temporary */
3104 message = US string_sprintf("%s: %s", message, strerror(save_errno));
3105 if (host->next != NULL) log_write(0, LOG_MAIN, "%s", message);
3106 msglog_line(host, message);
3107 *message_defer = TRUE;
3111 /* Otherwise, we have an I/O error or a timeout other than after MAIL or
3112 ".", or some other transportation error. We defer all addresses and yield
3113 DEFER, except for the case of failed add_headers expansion, or a transport
3114 filter failure, when the yield should be ERROR, to stop it trying other
3120 yield = (save_errno == ERRNO_CHHEADER_FAIL ||
3121 save_errno == ERRNO_FILTER_FAIL)? ERROR : DEFER;
3125 set_errno(addrlist, save_errno, set_message, set_rc, pass_message, host
3126 #ifdef EXPERIMENTAL_DSN_INFO
3127 , sx.smtp_greeting, sx.helo_response
3133 /* If all has gone well, send_quit will be set TRUE, implying we can end the
3134 SMTP session tidily. However, if there were too many addresses to send in one
3135 message (indicated by first_addr being non-NULL) we want to carry on with the
3136 rest of them. Also, it is desirable to send more than one message down the SMTP
3137 connection if there are several waiting, provided we haven't already sent so
3138 many as to hit the configured limit. The function transport_check_waiting looks
3139 for a waiting message and returns its id. Then transport_pass_socket tries to
3140 set up a continued delivery by passing the socket on to another process. The
3141 variable send_rset is FALSE if a message has just been successfully transfered.
3143 If we are already sending down a continued channel, there may be further
3144 addresses not yet delivered that are aimed at the same host, but which have not
3145 been passed in this run of the transport. In this case, continue_more will be
3146 true, and all we should do is send RSET if necessary, and return, leaving the
3149 However, if no address was disposed of, i.e. all addresses got 4xx errors, we
3150 do not want to continue with other messages down the same channel, because that
3151 can lead to looping between two or more messages, all with the same,
3152 temporarily failing address(es). [The retry information isn't updated yet, so
3153 new processes keep on trying.] We probably also don't want to try more of this
3154 message's addresses either.
3156 If we have started a TLS session, we have to end it before passing the
3157 connection to a new process. However, not all servers can handle this (Exim
3158 can), so we do not pass such a connection on if the host matches
3159 hosts_nopass_tls. */
3162 debug_printf("ok=%d send_quit=%d send_rset=%d continue_more=%d "
3163 "yield=%d first_address is %sNULL\n", sx.ok, sx.send_quit,
3164 sx.send_rset, continue_more, yield, sx.first_addr ? "not " : "");
3166 if (sx.completed_addr && sx.ok && sx.send_quit)
3169 smtp_compare_t t_compare;
3171 t_compare.tblock = tblock;
3172 t_compare.current_sender_address = sender_address;
3174 if ( sx.first_addr != NULL
3176 || ( ( tls_out.active < 0
3177 || verify_check_given_host(&sx.ob->hosts_nopass_tls, host) != OK
3180 transport_check_waiting(tblock->name, host->name,
3181 tblock->connection_max_messages, new_message_id, &more,
3182 (oicf)smtp_are_same_identities, (void*)&t_compare)
3189 if (! (sx.ok = smtp_write_command(&sx.outblock, FALSE, "RSET\r\n") >= 0))
3191 msg = US string_sprintf("send() to %s [%s] failed: %s", host->name,
3192 host->address, strerror(errno));
3193 sx.send_quit = FALSE;
3195 else if (! (sx.ok = smtp_read_response(&sx.inblock, sx.buffer,
3196 sizeof(sx.buffer), '2', sx.ob->command_timeout)))
3199 sx.send_quit = check_response(host, &errno, 0, sx.buffer, &code, &msg,
3203 DEBUG(D_transport) debug_printf("H=%s [%s] %s\n",
3204 host->name, host->address, msg);
3208 /* Either RSET was not needed, or it succeeded */
3212 if (sx.first_addr != NULL) /* More addresses still to be sent */
3213 { /* in this run of the transport */
3214 continue_sequence++; /* Causes * in logging */
3217 if (continue_more) return yield; /* More addresses for another run */
3219 /* Pass the socket to a new Exim process. Before doing so, we must shut
3220 down TLS. Not all MTAs allow for the continuation of the SMTP session
3221 when TLS is shut down. We test for this by sending a new EHLO. If we
3222 don't get a good response, we don't attempt to pass the socket on. */
3225 if (tls_out.active >= 0)
3227 tls_close(FALSE, TRUE);
3228 smtp_peer_options = smtp_peer_options_wrap;
3230 && smtp_write_command(&sx.outblock, FALSE,
3231 "EHLO %s\r\n", sx.helo_data) >= 0
3232 && smtp_read_response(&sx.inblock, sx.buffer, sizeof(sx.buffer),
3233 '2', sx.ob->command_timeout);
3237 /* If the socket is successfully passed, we mustn't send QUIT (or
3238 indeed anything!) from here. */
3240 /*XXX DSN_INFO: assume likely to do new HELO; but for greet we'll want to
3241 propagate it from the initial
3243 if (sx.ok && transport_pass_socket(tblock->name, host->name,
3244 host->address, new_message_id, sx.inblock.sock))
3245 sx.send_quit = FALSE;
3248 /* If RSET failed and there are addresses left, they get deferred. */
3250 else set_errno(sx.first_addr, errno, msg, DEFER, FALSE, host
3251 #ifdef EXPERIMENTAL_DSN_INFO
3252 , sx.smtp_greeting, sx.helo_response
3258 /* End off tidily with QUIT unless the connection has died or the socket has
3259 been passed to another process. There has been discussion on the net about what
3260 to do after sending QUIT. The wording of the RFC suggests that it is necessary
3261 to wait for a response, but on the other hand, there isn't anything one can do
3262 with an error response, other than log it. Exim used to do that. However,
3263 further discussion suggested that it is positively advantageous not to wait for
3264 the response, but to close the session immediately. This is supposed to move
3265 the TCP/IP TIME_WAIT state from the server to the client, thereby removing some
3266 load from the server. (Hosts that are both servers and clients may not see much
3267 difference, of course.) Further discussion indicated that this was safe to do
3268 on Unix systems which have decent implementations of TCP/IP that leave the
3269 connection around for a while (TIME_WAIT) after the application has gone away.
3270 This enables the response sent by the server to be properly ACKed rather than
3271 timed out, as can happen on broken TCP/IP implementations on other OS.
3273 This change is being made on 31-Jul-98. After over a year of trouble-free
3274 operation, the old commented-out code was removed on 17-Sep-99. */
3277 if (sx.send_quit) (void)smtp_write_command(&sx.outblock, FALSE, "QUIT\r\n");
3282 tls_close(FALSE, TRUE);
3285 /* Close the socket, and return the appropriate value, first setting
3286 works because the NULL setting is passed back to the calling process, and
3287 remote_max_parallel is forced to 1 when delivering over an existing connection,
3289 If all went well and continue_more is set, we shouldn't actually get here if
3290 there are further addresses, as the return above will be taken. However,
3291 writing RSET might have failed, or there may be other addresses whose hosts are
3292 specified in the transports, and therefore not visible at top level, in which
3293 case continue_more won't get set. */
3295 HDEBUG(D_transport|D_acl|D_v) debug_printf_indent(" SMTP(close)>>\n");
3298 shutdown(sx.outblock.sock, SHUT_WR);
3299 if (fcntl(sx.inblock.sock, F_SETFL, O_NONBLOCK) == 0)
3300 for (rc = 16; read(sx.inblock.sock, sx.inbuffer, sizeof(sx.inbuffer)) > 0 && rc > 0;)
3301 rc--; /* drain socket */
3303 (void)close(sx.inblock.sock);
3305 #ifndef DISABLE_EVENT
3306 (void) event_raise(tblock->event_action, US"tcp:close", NULL);
3309 continue_transport = NULL;
3310 continue_hostname = NULL;
3317 /*************************************************
3318 * Closedown entry point *
3319 *************************************************/
3321 /* This function is called when exim is passed an open smtp channel
3322 from another incarnation, but the message which it has been asked
3323 to deliver no longer exists. The channel is on stdin.
3325 We might do fancy things like looking for another message to send down
3326 the channel, but if the one we sought has gone, it has probably been
3327 delivered by some other process that itself will seek further messages,
3328 so just close down our connection.
3330 Argument: pointer to the transport instance block
3335 smtp_transport_closedown(transport_instance *tblock)
3337 smtp_transport_options_block *ob =
3338 (smtp_transport_options_block *)tblock->options_block;
3339 smtp_inblock inblock;
3340 smtp_outblock outblock;
3342 uschar inbuffer[4096];
3343 uschar outbuffer[16];
3345 inblock.sock = fileno(stdin);
3346 inblock.buffer = inbuffer;
3347 inblock.buffersize = sizeof(inbuffer);
3348 inblock.ptr = inbuffer;
3349 inblock.ptrend = inbuffer;
3351 outblock.sock = inblock.sock;
3352 outblock.buffersize = sizeof(outbuffer);
3353 outblock.buffer = outbuffer;
3354 outblock.ptr = outbuffer;
3355 outblock.cmd_count = 0;
3356 outblock.authenticating = FALSE;
3358 (void)smtp_write_command(&outblock, FALSE, "QUIT\r\n");
3359 (void)smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
3360 ob->command_timeout);
3361 (void)close(inblock.sock);
3366 /*************************************************
3367 * Prepare addresses for delivery *
3368 *************************************************/
3370 /* This function is called to flush out error settings from previous delivery
3371 attempts to other hosts. It also records whether we got here via an MX record
3372 or not in the more_errno field of the address. We are interested only in
3373 addresses that are still marked DEFER - others may have got delivered to a
3374 previously considered IP address. Set their status to PENDING_DEFER to indicate
3375 which ones are relevant this time.
3378 addrlist the list of addresses
3379 host the host we are delivering to
3381 Returns: the first address for this delivery
3384 static address_item *
3385 prepare_addresses(address_item *addrlist, host_item *host)
3387 address_item *first_addr = NULL;
3389 for (addr = addrlist; addr; addr = addr->next)
3390 if (addr->transport_return == DEFER)
3392 if (!first_addr) first_addr = addr;
3393 addr->transport_return = PENDING_DEFER;
3394 addr->basic_errno = 0;
3395 addr->more_errno = (host->mx >= 0)? 'M' : 'A';
3396 addr->message = NULL;
3398 addr->cipher = NULL;
3399 addr->ourcert = NULL;
3400 addr->peercert = NULL;
3401 addr->peerdn = NULL;
3402 addr->ocsp = OCSP_NOT_REQ;
3404 #ifdef EXPERIMENTAL_DSN_INFO
3405 addr->smtp_greeting = NULL;
3406 addr->helo_response = NULL;
3414 /*************************************************
3415 * Main entry point *
3416 *************************************************/
3418 /* See local README for interface details. As this is a remote transport, it is
3419 given a chain of addresses to be delivered in one connection, if possible. It
3420 always returns TRUE, indicating that each address has its own independent
3421 status set, except if there is a setting up problem, in which case it returns
3425 smtp_transport_entry(
3426 transport_instance *tblock, /* data for this instantiation */
3427 address_item *addrlist) /* addresses we are working on */
3431 int hosts_defer = 0;
3433 int hosts_looked_up = 0;
3434 int hosts_retry = 0;
3435 int hosts_serial = 0;
3436 int hosts_total = 0;
3437 int total_hosts_tried = 0;
3439 BOOL expired = TRUE;
3440 uschar *expanded_hosts = NULL;
3442 uschar *tid = string_sprintf("%s transport", tblock->name);
3443 smtp_transport_options_block *ob =
3444 (smtp_transport_options_block *)(tblock->options_block);
3445 host_item *hostlist = addrlist->host_list;
3446 host_item *host = NULL;
3450 debug_printf("%s transport entered\n", tblock->name);
3451 for (addr = addrlist; addr; addr = addr->next)
3452 debug_printf(" %s\n", addr->address);
3455 debug_printf("hostlist:\n");
3456 for (host = hostlist; host; host = host->next)
3457 debug_printf(" %s:%d\n", host->name, host->port);
3459 if (continue_hostname) debug_printf("already connected to %s [%s]\n",
3460 continue_hostname, continue_host_address);
3463 /* Set the flag requesting that these hosts be added to the waiting
3464 database if the delivery fails temporarily or if we are running with
3465 queue_smtp or a 2-stage queue run. This gets unset for certain
3466 kinds of error, typically those that are specific to the message. */
3468 update_waiting = TRUE;
3470 /* If a host list is not defined for the addresses - they must all have the
3471 same one in order to be passed to a single transport - or if the transport has
3472 a host list with hosts_override set, use the host list supplied with the
3473 transport. It is an error for this not to exist. */
3475 if (!hostlist || (ob->hosts_override && ob->hosts))
3479 addrlist->message = string_sprintf("%s transport called with no hosts set",
3481 addrlist->transport_return = PANIC;
3482 return FALSE; /* Only top address has status */
3485 DEBUG(D_transport) debug_printf("using the transport's hosts: %s\n",
3488 /* If the transport's host list contains no '$' characters, and we are not
3489 randomizing, it is fixed and therefore a chain of hosts can be built once
3490 and for all, and remembered for subsequent use by other calls to this
3491 transport. If, on the other hand, the host list does contain '$', or we are
3492 randomizing its order, we have to rebuild it each time. In the fixed case,
3493 as the hosts string will never be used again, it doesn't matter that we
3494 replace all the : characters with zeros. */
3498 uschar *s = ob->hosts;
3500 if (Ustrchr(s, '$') != NULL)
3502 if (!(expanded_hosts = expand_string(s)))
3504 addrlist->message = string_sprintf("failed to expand list of hosts "
3505 "\"%s\" in %s transport: %s", s, tblock->name, expand_string_message);
3506 addrlist->transport_return = search_find_defer ? DEFER : PANIC;
3507 return FALSE; /* Only top address has status */
3509 DEBUG(D_transport) debug_printf("expanded list of hosts \"%s\" to "
3510 "\"%s\"\n", s, expanded_hosts);
3514 if (ob->hosts_randomize) s = expanded_hosts = string_copy(s);
3516 host_build_hostlist(&hostlist, s, ob->hosts_randomize);
3518 /* Check that the expansion yielded something useful. */
3522 string_sprintf("%s transport has empty hosts setting", tblock->name);
3523 addrlist->transport_return = PANIC;
3524 return FALSE; /* Only top address has status */
3527 /* If there was no expansion of hosts, save the host list for
3530 if (!expanded_hosts) ob->hostlist = hostlist;
3533 /* This is not the first time this transport has been run in this delivery;
3534 the host list was built previously. */
3537 hostlist = ob->hostlist;
3540 /* The host list was supplied with the address. If hosts_randomize is set, we
3541 must sort it into a random order if it did not come from MX records and has not
3542 already been randomized (but don't bother if continuing down an existing
3545 else if (ob->hosts_randomize && hostlist->mx == MX_NONE && !continue_hostname)
3547 host_item *newlist = NULL;
3550 host_item *h = hostlist;
3551 hostlist = hostlist->next;
3553 h->sort_key = random_number(100);
3560 else if (h->sort_key < newlist->sort_key)
3567 host_item *hh = newlist;
3570 if (h->sort_key < hh->next->sort_key) break;
3578 hostlist = addrlist->host_list = newlist;
3581 /* Sort out the default port. */
3583 if (!smtp_get_port(ob->port, addrlist, &port, tid)) return FALSE;
3585 /* For each host-plus-IP-address on the list:
3587 . If this is a continued delivery and the host isn't the one with the
3588 current connection, skip.
3590 . If the status is unusable (i.e. previously failed or retry checked), skip.
3592 . If no IP address set, get the address, either by turning the name into
3593 an address, calling gethostbyname if gethostbyname is on, or by calling
3594 the DNS. The DNS may yield multiple addresses, in which case insert the
3595 extra ones into the list.
3597 . Get the retry data if not previously obtained for this address and set the
3598 field which remembers the state of this address. Skip if the retry time is
3599 not reached. If not, remember whether retry data was found. The retry string
3600 contains both the name and the IP address.
3602 . Scan the list of addresses and mark those whose status is DEFER as
3603 PENDING_DEFER. These are the only ones that will be processed in this cycle
3606 . Make a delivery attempt - addresses marked PENDING_DEFER will be tried.
3607 Some addresses may be successfully delivered, others may fail, and yet
3608 others may get temporary errors and so get marked DEFER.
3610 . The return from the delivery attempt is OK if a connection was made and a
3611 valid SMTP dialogue was completed. Otherwise it is DEFER.
3613 . If OK, add a "remove" retry item for this host/IPaddress, if any.
3615 . If fail to connect, or other defer state, add a retry item.
3617 . If there are any addresses whose status is still DEFER, carry on to the
3618 next host/IPaddress, unless we have tried the number of hosts given
3619 by hosts_max_try or hosts_max_try_hardlimit; otherwise return. Note that
3620 there is some fancy logic for hosts_max_try that means its limit can be
3621 overstepped in some circumstances.
3623 If we get to the end of the list, all hosts have deferred at least one address,
3624 or not reached their retry times. If delay_after_cutoff is unset, it requests a
3625 delivery attempt to those hosts whose last try was before the arrival time of
3626 the current message. To cope with this, we have to go round the loop a second
3627 time. After that, set the status and error data for any addresses that haven't
3628 had it set already. */
3630 for (cutoff_retry = 0;
3631 expired && cutoff_retry < (ob->delay_after_cutoff ? 1 : 2);
3634 host_item *nexthost = NULL;
3635 int unexpired_hosts_tried = 0;
3637 for (host = hostlist;
3639 && unexpired_hosts_tried < ob->hosts_max_try
3640 && total_hosts_tried < ob->hosts_max_try_hardlimit;
3646 BOOL host_is_expired = FALSE;
3647 BOOL message_defer = FALSE;
3648 BOOL some_deferred = FALSE;
3649 address_item *first_addr = NULL;
3650 uschar *interface = NULL;
3651 uschar *retry_host_key = NULL;
3652 uschar *retry_message_key = NULL;
3653 uschar *serialize_key = NULL;
3655 /* Default next host is next host. :-) But this can vary if the
3656 hosts_max_try limit is hit (see below). It may also be reset if a host
3657 address is looked up here (in case the host was multihomed). */
3659 nexthost = host->next;
3661 /* If the address hasn't yet been obtained from the host name, look it up
3662 now, unless the host is already marked as unusable. If it is marked as
3663 unusable, it means that the router was unable to find its IP address (in
3664 the DNS or wherever) OR we are in the 2nd time round the cutoff loop, and
3665 the lookup failed last time. We don't get this far if *all* MX records
3666 point to non-existent hosts; that is treated as a hard error.
3668 We can just skip this host entirely. When the hosts came from the router,
3669 the address will timeout based on the other host(s); when the address is
3670 looked up below, there is an explicit retry record added.
3672 Note that we mustn't skip unusable hosts if the address is not unset; they
3673 may be needed as expired hosts on the 2nd time round the cutoff loop. */
3677 int new_port, flags;
3680 if (host->status >= hstatus_unusable)
3682 DEBUG(D_transport) debug_printf("%s has no address and is unusable - skipping\n",
3687 DEBUG(D_transport) debug_printf("getting address for %s\n", host->name);
3689 /* The host name is permitted to have an attached port. Find it, and
3690 strip it from the name. Just remember it for now. */
3692 new_port = host_item_get_port(host);
3694 /* Count hosts looked up */
3698 /* Find by name if so configured, or if it's an IP address. We don't
3699 just copy the IP address, because we need the test-for-local to happen. */
3701 flags = HOST_FIND_BY_A;
3702 if (ob->dns_qualify_single) flags |= HOST_FIND_QUALIFY_SINGLE;
3703 if (ob->dns_search_parents) flags |= HOST_FIND_SEARCH_PARENTS;
3705 if (ob->gethostbyname || string_is_ip_address(host->name, NULL) != 0)
3706 rc = host_find_byname(host, NULL, flags, NULL, TRUE);
3708 rc = host_find_bydns(host, NULL, flags, NULL, NULL, NULL,
3709 &ob->dnssec, /* domains for request/require */
3712 /* Update the host (and any additional blocks, resulting from
3713 multihoming) with a host-specific port, if any. */
3715 for (hh = host; hh != nexthost; hh = hh->next) hh->port = new_port;
3717 /* Failure to find the host at this time (usually DNS temporary failure)
3718 is really a kind of routing failure rather than a transport failure.
3719 Therefore we add a retry item of the routing kind, not to stop us trying
3720 to look this name up here again, but to ensure the address gets timed
3721 out if the failures go on long enough. A complete failure at this point
3722 commonly points to a configuration error, but the best action is still
3723 to carry on for the next host. */
3725 if (rc == HOST_FIND_AGAIN || rc == HOST_FIND_FAILED)
3727 retry_add_item(addrlist, string_sprintf("R:%s", host->name), 0);
3729 if (rc == HOST_FIND_AGAIN) hosts_defer++; else hosts_fail++;
3730 DEBUG(D_transport) debug_printf("rc = %s for %s\n", (rc == HOST_FIND_AGAIN)?
3731 "HOST_FIND_AGAIN" : "HOST_FIND_FAILED", host->name);
3732 host->status = hstatus_unusable;
3734 for (addr = addrlist; addr; addr = addr->next)
3736 if (addr->transport_return != DEFER) continue;
3737 addr->basic_errno = ERRNO_UNKNOWNHOST;
3739 string_sprintf("failed to lookup IP address for %s", host->name);
3744 /* If the host is actually the local host, we may have a problem, or
3745 there may be some cunning configuration going on. In the problem case,
3746 log things and give up. The default transport status is already DEFER. */
3748 if (rc == HOST_FOUND_LOCAL && !ob->allow_localhost)
3750 for (addr = addrlist; addr; addr = addr->next)
3752 addr->basic_errno = 0;
3753 addr->message = string_sprintf("%s transport found host %s to be "
3754 "local", tblock->name, host->name);
3758 } /* End of block for IP address lookup */
3760 /* If this is a continued delivery, we are interested only in the host
3761 which matches the name of the existing open channel. The check is put
3762 here after the local host lookup, in case the name gets expanded as a
3763 result of the lookup. Set expired FALSE, to save the outer loop executing
3766 if ( continue_hostname
3767 && ( Ustrcmp(continue_hostname, host->name) != 0
3768 || Ustrcmp(continue_host_address, host->address) != 0
3772 continue; /* With next host */
3775 /* Reset the default next host in case a multihomed host whose addresses
3776 are not looked up till just above added to the host list. */
3778 nexthost = host->next;
3780 /* If queue_smtp is set (-odqs or the first part of a 2-stage run), or the
3781 domain is in queue_smtp_domains, we don't actually want to attempt any
3782 deliveries. When doing a queue run, queue_smtp_domains is always unset. If
3783 there is a lookup defer in queue_smtp_domains, proceed as if the domain
3784 were not in it. We don't want to hold up all SMTP deliveries! Except when
3785 doing a two-stage queue run, don't do this if forcing. */
3787 if ((!deliver_force || queue_2stage) && (queue_smtp ||
3788 match_isinlist(addrlist->domain,
3789 (const uschar **)&queue_smtp_domains, 0,
3790 &domainlist_anchor, NULL, MCL_DOMAIN, TRUE, NULL) == OK))
3793 for (addr = addrlist; addr; addr = addr->next)
3794 if (addr->transport_return == DEFER)
3795 addr->message = US"domain matches queue_smtp_domains, or -odqs set";
3796 continue; /* With next host */
3799 /* Count hosts being considered - purely for an intelligent comment
3800 if none are usable. */
3804 /* Set $host and $host address now in case they are needed for the
3805 interface expansion or the serialize_hosts check; they remain set if an
3806 actual delivery happens. */
3808 deliver_host = host->name;
3809 deliver_host_address = host->address;
3810 lookup_dnssec_authenticated = host->dnssec == DS_YES ? US"yes"
3811 : host->dnssec == DS_NO ? US"no"
3814 /* Set up a string for adding to the retry key if the port number is not
3815 the standard SMTP port. A host may have its own port setting that overrides
3818 pistring = string_sprintf(":%d", host->port == PORT_NONE
3819 ? port : host->port);
3820 if (Ustrcmp(pistring, ":25") == 0) pistring = US"";
3822 /* Select IPv4 or IPv6, and choose an outgoing interface. If the interface
3823 string is set, even if constant (as different transports can have different
3824 constant settings), we must add it to the key that is used for retries,
3825 because connections to the same host from a different interface should be
3826 treated separately. */
3828 host_af = Ustrchr(host->address, ':') == NULL ? AF_INET : AF_INET6;
3829 if ((rs = ob->interface) && *rs)
3831 if (!smtp_get_interface(rs, host_af, addrlist, &interface, tid))
3833 pistring = string_sprintf("%s/%s", pistring, interface);
3836 /* The first time round the outer loop, check the status of the host by
3837 inspecting the retry data. The second time round, we are interested only
3838 in expired hosts that haven't been tried since this message arrived. */
3840 if (cutoff_retry == 0)
3843 /* Ensure the status of the address is set by checking retry data if
3844 necessary. There may be host-specific retry data (applicable to all
3845 messages) and also data for retries of a specific message at this host.
3846 If either of these retry records are actually read, the keys used are
3847 returned to save recomputing them later. */
3849 if (exp_bool(addrlist, US"transport", tblock->name, D_transport,
3850 US"retry_include_ip_address", ob->retry_include_ip_address,
3851 ob->expand_retry_include_ip_address, &incl_ip) != OK)
3852 continue; /* with next host */
3854 host_is_expired = retry_check_address(addrlist->domain, host, pistring,
3855 incl_ip, &retry_host_key, &retry_message_key);
3857 DEBUG(D_transport) debug_printf("%s [%s]%s status = %s\n", host->name,
3858 (host->address == NULL)? US"" : host->address, pistring,
3859 (host->status == hstatus_usable)? "usable" :
3860 (host->status == hstatus_unusable)? "unusable" :
3861 (host->status == hstatus_unusable_expired)? "unusable (expired)" : "?");
3863 /* Skip this address if not usable at this time, noting if it wasn't
3864 actually expired, both locally and in the address. */
3866 switch (host->status)
3868 case hstatus_unusable:
3870 setflag(addrlist, af_retry_skipped);
3873 case hstatus_unusable_expired:
3876 case hwhy_retry: hosts_retry++; break;
3877 case hwhy_failed: hosts_fail++; break;
3878 case hwhy_deferred: hosts_defer++; break;
3881 /* If there was a retry message key, implying that previously there
3882 was a message-specific defer, we don't want to update the list of
3883 messages waiting for these hosts. */
3885 if (retry_message_key) update_waiting = FALSE;
3886 continue; /* With the next host or IP address */
3890 /* Second time round the loop: if the address is set but expired, and
3891 the message is newer than the last try, let it through. */
3896 || host->status != hstatus_unusable_expired
3897 || host->last_try > received_time)
3899 DEBUG(D_transport) debug_printf("trying expired host %s [%s]%s\n",
3900 host->name, host->address, pistring);
3901 host_is_expired = TRUE;
3904 /* Setting "expired=FALSE" doesn't actually mean not all hosts are expired;
3905 it remains TRUE only if all hosts are expired and none are actually tried.
3910 /* If this host is listed as one to which access must be serialized,
3911 see if another Exim process has a connection to it, and if so, skip
3912 this host. If not, update the database to record our connection to it
3913 and remember this for later deletion. Do not do any of this if we are
3914 sending the message down a pre-existing connection. */
3916 if ( !continue_hostname
3917 && verify_check_given_host(&ob->serialize_hosts, host) == OK)
3919 serialize_key = string_sprintf("host-serialize-%s", host->name);
3920 if (!enq_start(serialize_key, 1))
3923 debug_printf("skipping host %s because another Exim process "
3924 "is connected to it\n", host->name);
3930 /* OK, we have an IP address that is not waiting for its retry time to
3931 arrive (it might be expired) OR (second time round the loop) we have an
3932 expired host that hasn't been tried since the message arrived. Have a go
3933 at delivering the message to it. First prepare the addresses by flushing
3934 out the result of previous attempts, and finding the first address that
3935 is still to be delivered. */
3937 first_addr = prepare_addresses(addrlist, host);
3939 DEBUG(D_transport) debug_printf("delivering %s to %s [%s] (%s%s)\n",
3940 message_id, host->name, host->address, addrlist->address,
3941 addrlist->next ? ", ..." : "");
3943 set_process_info("delivering %s to %s [%s] (%s%s)",
3944 message_id, host->name, host->address, addrlist->address,
3945 addrlist->next ? ", ..." : "");
3947 /* This is not for real; don't do the delivery. If there are
3948 any remaining hosts, list them. */
3953 set_errno_nohost(addrlist, 0, NULL, OK, FALSE);
3954 for (addr = addrlist; addr; addr = addr->next)
3956 addr->host_used = host;
3957 addr->special_action = '*';
3958 addr->message = US"delivery bypassed by -N option";
3962 debug_printf("*** delivery by %s transport bypassed by -N option\n"
3963 "*** host and remaining hosts:\n", tblock->name);
3964 for (host2 = host; host2; host2 = host2->next)
3965 debug_printf(" %s [%s]\n", host2->name,
3966 host2->address ? host2->address : US"unset");
3971 /* This is for real. If the host is expired, we don't count it for
3972 hosts_max_retry. This ensures that all hosts must expire before an address
3973 is timed out, unless hosts_max_try_hardlimit (which protects against
3974 lunatic DNS configurations) is reached.
3976 If the host is not expired and we are about to hit the hosts_max_retry
3977 limit, check to see if there is a subsequent hosts with a different MX
3978 value. If so, make that the next host, and don't count this one. This is a
3979 heuristic to make sure that different MXs do get tried. With a normal kind
3980 of retry rule, they would get tried anyway when the earlier hosts were
3981 delayed, but if the domain has a "retry every time" type of rule - as is
3982 often used for the the very large ISPs, that won't happen. */
3987 /* Make a copy of the host if it is local to this invocation
3988 of the transport. */
3992 thost = store_get(sizeof(host_item));
3994 thost->name = string_copy(host->name);
3995 thost->address = string_copy(host->address);
4000 if (!host_is_expired && ++unexpired_hosts_tried >= ob->hosts_max_try)
4004 debug_printf("hosts_max_try limit reached with this host\n");
4005 for (h = host; h; h = h->next) if (h->mx != host->mx)
4008 unexpired_hosts_tried--;
4009 DEBUG(D_transport) debug_printf("however, a higher MX host exists "
4010 "and will be tried\n");
4015 /* Attempt the delivery. */
4017 total_hosts_tried++;
4018 rc = smtp_deliver(addrlist, thost, host_af, port, interface, tblock,
4019 &message_defer, FALSE);
4022 OK => connection made, each address contains its result;
4023 message_defer is set for message-specific defers (when all
4024 recipients are marked defer)
4025 DEFER => there was a non-message-specific delivery problem;
4026 ERROR => there was a problem setting up the arguments for a filter,
4027 or there was a problem with expanding added headers
4030 /* If the result is not OK, there was a non-message-specific problem.
4031 If the result is DEFER, we need to write to the logs saying what happened
4032 for this particular host, except in the case of authentication and TLS
4033 failures, where the log has already been written. If all hosts defer a
4034 general message is written at the end. */
4036 if (rc == DEFER && first_addr->basic_errno != ERRNO_AUTHFAIL
4037 && first_addr->basic_errno != ERRNO_TLSFAILURE)
4038 write_logs(first_addr, host);
4040 #ifndef DISABLE_EVENT
4042 deferred_event_raise(first_addr, host);
4045 /* If STARTTLS was accepted, but there was a failure in setting up the
4046 TLS session (usually a certificate screwup), and the host is not in
4047 hosts_require_tls, and tls_tempfail_tryclear is true, try again, with
4048 TLS forcibly turned off. We have to start from scratch with a new SMTP
4049 connection. That's why the retry is done from here, not from within
4050 smtp_deliver(). [Rejections of STARTTLS itself don't screw up the
4051 session, so the in-clear transmission after those errors, if permitted,
4052 happens inside smtp_deliver().] */
4056 && first_addr->basic_errno == ERRNO_TLSFAILURE
4057 && ob->tls_tempfail_tryclear
4058 && verify_check_given_host(&ob->hosts_require_tls, host) != OK
4061 log_write(0, LOG_MAIN, "TLS session failure: delivering unencrypted "
4062 "to %s [%s] (not in hosts_require_tls)", host->name, host->address);
4063 first_addr = prepare_addresses(addrlist, host);
4064 rc = smtp_deliver(addrlist, thost, host_af, port, interface, tblock,
4065 &message_defer, TRUE);
4066 if (rc == DEFER && first_addr->basic_errno != ERRNO_AUTHFAIL)
4067 write_logs(first_addr, host);
4068 # ifndef DISABLE_EVENT
4070 deferred_event_raise(first_addr, host);
4073 #endif /*SUPPORT_TLS*/
4076 /* Delivery attempt finished */
4078 rs = rc == OK ? US"OK"
4079 : rc == DEFER ? US"DEFER"
4080 : rc == ERROR ? US"ERROR"
4083 set_process_info("delivering %s: just tried %s [%s] for %s%s: result %s",
4084 message_id, host->name, host->address, addrlist->address,
4085 addrlist->next ? " (& others)" : "", rs);
4087 /* Release serialization if set up */
4089 if (serialize_key) enq_end(serialize_key);
4091 /* If the result is DEFER, or if a host retry record is known to exist, we
4092 need to add an item to the retry chain for updating the retry database
4093 at the end of delivery. We only need to add the item to the top address,
4094 of course. Also, if DEFER, we mark the IP address unusable so as to skip it
4095 for any other delivery attempts using the same address. (It is copied into
4096 the unusable tree at the outer level, so even if different address blocks
4097 contain the same address, it still won't get tried again.) */
4099 if (rc == DEFER || retry_host_key)
4101 int delete_flag = rc != DEFER ? rf_delete : 0;
4102 if (!retry_host_key)
4105 if (exp_bool(addrlist, US"transport", tblock->name, D_transport,
4106 US"retry_include_ip_address", ob->retry_include_ip_address,
4107 ob->expand_retry_include_ip_address, &incl_ip) != OK)
4108 incl_ip = TRUE; /* error; use most-specific retry record */
4110 retry_host_key = incl_ip
4111 ? string_sprintf("T:%S:%s%s", host->name, host->address, pistring)
4112 : string_sprintf("T:%S%s", host->name, pistring);
4115 /* If a delivery of another message over an existing SMTP connection
4116 yields DEFER, we do NOT set up retry data for the host. This covers the
4117 case when there are delays in routing the addresses in the second message
4118 that are so long that the server times out. This is alleviated by not
4119 routing addresses that previously had routing defers when handling an
4120 existing connection, but even so, this case may occur (e.g. if a
4121 previously happily routed address starts giving routing defers). If the
4122 host is genuinely down, another non-continued message delivery will
4123 notice it soon enough. */
4125 if (delete_flag != 0 || !continue_hostname)
4126 retry_add_item(first_addr, retry_host_key, rf_host | delete_flag);
4128 /* We may have tried an expired host, if its retry time has come; ensure
4129 the status reflects the expiry for the benefit of any other addresses. */
4133 host->status = host_is_expired
4134 ? hstatus_unusable_expired : hstatus_unusable;
4135 host->why = hwhy_deferred;
4139 /* If message_defer is set (host was OK, but every recipient got deferred
4140 because of some message-specific problem), or if that had happened
4141 previously so that a message retry key exists, add an appropriate item
4142 to the retry chain. Note that if there was a message defer but now there is
4143 a host defer, the message defer record gets deleted. That seems perfectly
4144 reasonable. Also, stop the message from being remembered as waiting
4145 for specific hosts. */
4147 if (message_defer || retry_message_key)
4149 int delete_flag = message_defer ? 0 : rf_delete;
4150 if (!retry_message_key)
4153 if (exp_bool(addrlist, US"transport", tblock->name, D_transport,
4154 US"retry_include_ip_address", ob->retry_include_ip_address,
4155 ob->expand_retry_include_ip_address, &incl_ip) != OK)
4156 incl_ip = TRUE; /* error; use most-specific retry record */
4158 retry_message_key = incl_ip
4159 ? string_sprintf("T:%S:%s%s:%s", host->name, host->address, pistring,
4161 : string_sprintf("T:%S%s:%s", host->name, pistring, message_id);
4163 retry_add_item(addrlist, retry_message_key,
4164 rf_message | rf_host | delete_flag);
4165 update_waiting = FALSE;
4168 /* Any return other than DEFER (that is, OK or ERROR) means that the
4169 addresses have got their final statuses filled in for this host. In the OK
4170 case, see if any of them are deferred. */
4173 for (addr = addrlist; addr; addr = addr->next)
4174 if (addr->transport_return == DEFER)
4176 some_deferred = TRUE;
4180 /* If no addresses deferred or the result was ERROR, return. We do this for
4181 ERROR because a failing filter set-up or add_headers expansion is likely to
4182 fail for any host we try. */
4184 if (rc == ERROR || (rc == OK && !some_deferred))
4186 DEBUG(D_transport) debug_printf("Leaving %s transport\n", tblock->name);
4187 return TRUE; /* Each address has its status */
4190 /* If the result was DEFER or some individual addresses deferred, let
4191 the loop run to try other hosts with the deferred addresses, except for the
4192 case when we were trying to deliver down an existing channel and failed.
4193 Don't try any other hosts in this case. */
4195 if (continue_hostname) break;
4197 /* If the whole delivery, or some individual addresses, were deferred and
4198 there are more hosts that could be tried, do not count this host towards
4199 the hosts_max_try limit if the age of the message is greater than the
4200 maximum retry time for this host. This means we may try try all hosts,
4201 ignoring the limit, when messages have been around for some time. This is
4202 important because if we don't try all hosts, the address will never time
4203 out. NOTE: this does not apply to hosts_max_try_hardlimit. */
4205 if ((rc == DEFER || some_deferred) && nexthost)
4208 retry_config *retry = retry_find_config(host->name, NULL, 0, 0);
4210 if (retry && retry->rules)
4212 retry_rule *last_rule;
4213 for (last_rule = retry->rules;
4215 last_rule = last_rule->next);
4216 timedout = time(NULL) - received_time > last_rule->timeout;
4218 else timedout = TRUE; /* No rule => timed out */
4222 unexpired_hosts_tried--;
4223 DEBUG(D_transport) debug_printf("temporary delivery error(s) override "
4224 "hosts_max_try (message older than host's retry time)\n");
4227 } /* End of loop for trying multiple hosts. */
4229 /* This is the end of the loop that repeats iff expired is TRUE and
4230 ob->delay_after_cutoff is FALSE. The second time round we will
4231 try those hosts that haven't been tried since the message arrived. */
4235 debug_printf("all IP addresses skipped or deferred at least one address\n");
4236 if (expired && !ob->delay_after_cutoff && cutoff_retry == 0)
4237 debug_printf("retrying IP addresses not tried since message arrived\n");
4242 /* Get here if all IP addresses are skipped or defer at least one address. In
4243 MUA wrapper mode, this will happen only for connection or other non-message-
4244 specific failures. Force the delivery status for all addresses to FAIL. */
4248 for (addr = addrlist; addr; addr = addr->next)
4249 addr->transport_return = FAIL;
4253 /* In the normal, non-wrapper case, add a standard message to each deferred
4254 address if there hasn't been an error, that is, if it hasn't actually been
4255 tried this time. The variable "expired" will be FALSE if any deliveries were
4256 actually tried, or if there was at least one host that was not expired. That
4257 is, it is TRUE only if no deliveries were tried and all hosts were expired. If
4258 a delivery has been tried, an error code will be set, and the failing of the
4259 message is handled by the retry code later.
4261 If queue_smtp is set, or this transport was called to send a subsequent message
4262 down an existing TCP/IP connection, and something caused the host not to be
4263 found, we end up here, but can detect these cases and handle them specially. */
4265 for (addr = addrlist; addr; addr = addr->next)
4267 /* If host is not NULL, it means that we stopped processing the host list
4268 because of hosts_max_try or hosts_max_try_hardlimit. In the former case, this
4269 means we need to behave as if some hosts were skipped because their retry
4270 time had not come. Specifically, this prevents the address from timing out.
4271 However, if we have hit hosts_max_try_hardlimit, we want to behave as if all
4272 hosts were tried. */
4275 if (total_hosts_tried >= ob->hosts_max_try_hardlimit)
4278 debug_printf("hosts_max_try_hardlimit reached: behave as if all "
4279 "hosts were tried\n");
4284 debug_printf("hosts_max_try limit caused some hosts to be skipped\n");
4285 setflag(addr, af_retry_skipped);
4288 if (queue_smtp) /* no deliveries attempted */
4290 addr->transport_return = DEFER;
4291 addr->basic_errno = 0;
4292 addr->message = US"SMTP delivery explicitly queued";
4295 else if ( addr->transport_return == DEFER
4296 && (addr->basic_errno == ERRNO_UNKNOWNERROR || addr->basic_errno == 0)
4300 addr->basic_errno = ERRNO_HRETRY;
4301 if (continue_hostname)
4302 addr->message = US"no host found for existing SMTP connection";
4305 setflag(addr, af_pass_message); /* This is not a security risk */
4306 addr->message = string_sprintf(
4307 "all hosts%s have been failing for a long time %s",
4308 addr->domain ? string_sprintf(" for '%s'", addr->domain) : US"",
4309 ob->delay_after_cutoff
4310 ? US"(and retry time not reached)"
4311 : US"and were last tried after this message arrived");
4313 /* If we are already using fallback hosts, or there are no fallback hosts
4314 defined, convert the result to FAIL to cause a bounce. */
4316 if (addr->host_list == addr->fallback_hosts || !addr->fallback_hosts)
4317 addr->transport_return = FAIL;
4322 if (hosts_retry == hosts_total)
4323 s = "retry time not reached for any host%s";
4324 else if (hosts_fail == hosts_total)
4325 s = "all host address lookups%s failed permanently";
4326 else if (hosts_defer == hosts_total)
4327 s = "all host address lookups%s failed temporarily";
4328 else if (hosts_serial == hosts_total)
4329 s = "connection limit reached for all hosts%s";
4330 else if (hosts_fail+hosts_defer == hosts_total)
4331 s = "all host address lookups%s failed";
4333 s = "some host address lookups failed and retry time "
4334 "not reached for other hosts or connection limit reached%s";
4336 addr->message = string_sprintf(s,
4337 addr->domain ? string_sprintf(" for '%s'", addr->domain) : US"");
4342 /* Update the database which keeps information about which messages are waiting
4343 for which hosts to become available. For some message-specific errors, the
4344 update_waiting flag is turned off because we don't want follow-on deliveries in
4345 those cases. If this transport instance is explicitly limited to one message
4346 per connection then follow-on deliveries are not possible and there's no need
4347 to create/update the per-transport wait-<transport_name> database. */
4349 if (update_waiting && tblock->connection_max_messages != 1)
4350 transport_update_waiting(hostlist, tblock->name);
4354 DEBUG(D_transport) debug_printf("Leaving %s transport\n", tblock->name);
4356 return TRUE; /* Each address has its status */
4361 /* End of transport/smtp.c */