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
2642 /* Initiate a message transfer. */
2644 switch(smtp_write_mail_and_rcpt_cmds(&sx, &yield))
2647 case -1: case -2: goto RESPONSE_FAILED;
2648 case -3: goto END_OFF;
2649 case -4: goto SEND_QUIT;
2650 default: goto SEND_FAILED;
2653 /* If we are an MUA wrapper, abort if any RCPTs were rejected, either
2654 permanently or temporarily. We should have flushed and synced after the last
2662 for (a = sx.first_addr, cnt = 0; a && cnt < sx.max_rcpt; a = a->next, cnt++)
2663 if (a->transport_return != PENDING_OK)
2665 /*XXX could we find a better errno than 0 here? */
2666 set_errno_nohost(addrlist, 0, a->message, FAIL,
2667 testflag(a, af_pass_message));
2674 /* If ok is TRUE, we know we have got at least one good recipient, and must now
2675 send DATA, but if it is FALSE (in the normal, non-wrapper case), we may still
2676 have a good recipient buffered up if we are pipelining. We don't want to waste
2677 time sending DATA needlessly, so we only send it if either ok is TRUE or if we
2678 are pipelining. The responses are all handled by sync_responses().
2679 If using CHUNKING, do not send a BDAT until we know how big a chunk we want
2682 if ( !(sx.peer_offered & PEER_OFFERED_CHUNKING)
2683 && (sx.ok || (pipelining_active && !mua_wrapper)))
2685 int count = smtp_write_command(&sx.outblock, FALSE, "DATA\r\n");
2687 if (count < 0) goto SEND_FAILED;
2688 switch(sync_responses(&sx, count, sx.ok ? +1 : -1))
2690 case 3: sx.ok = TRUE; /* 2xx & 5xx => OK & progress made */
2691 case 2: sx.completed_addr = TRUE; /* 5xx (only) => progress made */
2694 case 1: sx.ok = TRUE; /* 2xx (only) => OK, but if LMTP, */
2695 if (!sx.lmtp) sx.completed_addr = TRUE; /* can't tell about progress yet */
2696 case 0: break; /* No 2xx or 5xx, but no probs */
2698 case -1: goto END_OFF; /* Timeout on RCPT */
2699 default: goto RESPONSE_FAILED; /* I/O error, or any MAIL/DATA error */
2701 pipelining_active = FALSE;
2702 data_command = string_copy(big_buffer); /* Save for later error message */
2705 /* If there were no good recipients (but otherwise there have been no
2706 problems), just set ok TRUE, since we have handled address-specific errors
2707 already. Otherwise, it's OK to send the message. Use the check/escape mechanism
2708 for handling the SMTP dot-handling protocol, flagging to apply to headers as
2709 well as body. Set the appropriate timeout value to be used for each chunk.
2710 (Haven't been able to make it work using select() for writing yet.) */
2712 if (!(sx.peer_offered & PEER_OFFERED_CHUNKING) && !sx.ok)
2714 /* Save the first address of the next batch. */
2715 sx.first_addr = sx.next_addr;
2721 transport_ctx tctx = {
2724 US".", US"..", /* Escaping strings */
2725 topt_use_crlf | topt_escape_headers
2726 | (tblock->body_only ? topt_no_headers : 0)
2727 | (tblock->headers_only ? topt_no_body : 0)
2728 | (tblock->return_path_add ? topt_add_return_path : 0)
2729 | (tblock->delivery_date_add ? topt_add_delivery_date : 0)
2730 | (tblock->envelope_to_add ? topt_add_envelope_to : 0)
2733 /* If using CHUNKING we need a callback from the generic transport
2734 support to us, for the sending of BDAT smtp commands and the reaping
2735 of responses. The callback needs a whole bunch of state so set up
2736 a transport-context structure to be passed around. */
2738 if (sx.peer_offered & PEER_OFFERED_CHUNKING)
2740 tctx.check_string = tctx.escape_string = NULL;
2741 tctx.options |= topt_use_bdat;
2742 tctx.chunk_cb = smtp_chunk_cmd_callback;
2743 sx.pending_BDAT = FALSE;
2744 sx.good_RCPT = sx.ok;
2746 tctx.smtp_context = &sx;
2749 tctx.options |= topt_end_dot;
2751 /* Save the first address of the next batch. */
2752 sx.first_addr = sx.next_addr;
2754 /* Responses from CHUNKING commands go in buffer. Otherwise,
2755 there has not been a response. */
2759 sigalrm_seen = FALSE;
2760 transport_write_timeout = sx.ob->data_timeout;
2761 smtp_command = US"sending data block"; /* For error messages */
2762 DEBUG(D_transport|D_v)
2763 if (sx.peer_offered & PEER_OFFERED_CHUNKING)
2764 debug_printf(" will write message using CHUNKING\n");
2766 debug_printf(" SMTP>> writing message and terminating \".\"\n");
2767 transport_count = 0;
2769 #ifndef DISABLE_DKIM
2770 sx.ok = dkim_transport_write_message(sx.inblock.sock, &tctx, &sx.ob->dkim);
2772 sx.ok = transport_write_message(sx.inblock.sock, &tctx, 0);
2775 /* transport_write_message() uses write() because it is called from other
2776 places to write to non-sockets. This means that under some OS (e.g. Solaris)
2777 it can exit with "Broken pipe" as its error. This really means that the
2778 socket got closed at the far end. */
2780 transport_write_timeout = 0; /* for subsequent transports */
2782 /* Failure can either be some kind of I/O disaster (including timeout),
2783 or the failure of a transport filter or the expansion of added headers.
2784 Or, when CHUNKING, it can be a protocol-detected failure. */
2787 goto RESPONSE_FAILED;
2789 /* We used to send the terminating "." explicitly here, but because of
2790 buffering effects at both ends of TCP/IP connections, you don't gain
2791 anything by keeping it separate, so it might as well go in the final
2792 data buffer for efficiency. This is now done by setting the topt_end_dot
2795 smtp_command = US"end of data";
2797 if (sx.peer_offered & PEER_OFFERED_CHUNKING && sx.cmd_count > 1)
2799 /* Reap any outstanding MAIL & RCPT commands, but not a DATA-go-ahead */
2800 switch(sync_responses(&sx, sx.cmd_count-1, 0))
2802 case 3: sx.ok = TRUE; /* 2xx & 5xx => OK & progress made */
2803 case 2: sx.completed_addr = TRUE; /* 5xx (only) => progress made */
2806 case 1: sx.ok = TRUE; /* 2xx (only) => OK, but if LMTP, */
2807 if (!sx.lmtp) sx.completed_addr = TRUE; /* can't tell about progress yet */
2808 case 0: break; /* No 2xx or 5xx, but no probs */
2810 case -1: goto END_OFF; /* Timeout on RCPT */
2811 default: goto RESPONSE_FAILED; /* I/O error, or any MAIL/DATA error */
2815 #ifndef DISABLE_PRDR
2816 /* For PRDR we optionally get a partial-responses warning
2817 * followed by the individual responses, before going on with
2818 * the overall response. If we don't get the warning then deal
2819 * with per non-PRDR. */
2822 sx.ok = smtp_read_response(&sx.inblock, sx.buffer, sizeof(sx.buffer), '3',
2823 sx.ob->final_timeout);
2824 if (!sx.ok && errno == 0) switch(sx.buffer[0])
2826 case '2': sx.prdr_active = FALSE;
2829 case '4': errno = ERRNO_DATA4XX;
2830 addrlist->more_errno |=
2831 ((sx.buffer[1] - '0')*10 + sx.buffer[2] - '0') << 8;
2838 /* For non-PRDR SMTP, we now read a single response that applies to the
2839 whole message. If it is OK, then all the addresses have been delivered. */
2843 sx.ok = smtp_read_response(&sx.inblock, sx.buffer, sizeof(sx.buffer), '2',
2844 sx.ob->final_timeout);
2845 if (!sx.ok && errno == 0 && sx.buffer[0] == '4')
2847 errno = ERRNO_DATA4XX;
2848 addrlist->more_errno |= ((sx.buffer[1] - '0')*10 + sx.buffer[2] - '0') << 8;
2852 /* For LMTP, we get back a response for every RCPT command that we sent;
2853 some may be accepted and some rejected. For those that get a response, their
2854 status is fixed; any that are accepted have been handed over, even if later
2855 responses crash - at least, that's how I read RFC 2033.
2857 If all went well, mark the recipient addresses as completed, record which
2858 host/IPaddress they were delivered to, and cut out RSET when sending another
2859 message down the same channel. Write the completed addresses to the journal
2860 now so that they are recorded in case there is a crash of hardware or
2861 software before the spool gets updated. Also record the final SMTP
2862 confirmation if needed (for SMTP only). */
2867 int delivery_time = (int)(time(NULL) - start_delivery_time);
2869 uschar *conf = NULL;
2871 sx.send_rset = FALSE;
2872 pipelining_active = FALSE;
2874 /* Set up confirmation if needed - applies only to SMTP */
2877 #ifdef DISABLE_EVENT
2878 LOGGING(smtp_confirmation) &&
2883 const uschar *s = string_printing(sx.buffer);
2884 /* deconst cast ok here as string_printing was checked to have alloc'n'copied */
2885 conf = (s == sx.buffer)? (uschar *)string_copy(s) : US s;
2888 /* Process all transported addresses - for LMTP or PRDR, read a status for
2891 for (addr = addrlist; addr != sx.first_addr; addr = addr->next)
2893 if (addr->transport_return != PENDING_OK) continue;
2895 /* LMTP - if the response fails badly (e.g. timeout), use it for all the
2896 remaining addresses. Otherwise, it's a return code for just the one
2897 address. For temporary errors, add a retry item for the address so that
2898 it doesn't get tried again too soon. */
2900 #ifndef DISABLE_PRDR
2901 if (sx.lmtp || sx.prdr_active)
2906 if (!smtp_read_response(&sx.inblock, sx.buffer, sizeof(sx.buffer), '2',
2907 sx.ob->final_timeout))
2909 if (errno != 0 || sx.buffer[0] == 0) goto RESPONSE_FAILED;
2910 addr->message = string_sprintf(
2911 #ifndef DISABLE_PRDR
2912 "%s error after %s: %s", sx.prdr_active ? "PRDR":"LMTP",
2914 "LMTP error after %s: %s",
2916 data_command, string_printing(sx.buffer));
2917 setflag(addr, af_pass_message); /* Allow message to go to user */
2918 if (sx.buffer[0] == '5')
2919 addr->transport_return = FAIL;
2922 errno = ERRNO_DATA4XX;
2923 addr->more_errno |= ((sx.buffer[1] - '0')*10 + sx.buffer[2] - '0') << 8;
2924 addr->transport_return = DEFER;
2925 #ifndef DISABLE_PRDR
2926 if (!sx.prdr_active)
2928 retry_add_item(addr, addr->address_retry_key, 0);
2932 sx.completed_addr = TRUE; /* NOW we can set this flag */
2933 if (LOGGING(smtp_confirmation))
2935 const uschar *s = string_printing(sx.buffer);
2936 /* deconst cast ok here as string_printing was checked to have alloc'n'copied */
2937 conf = (s == sx.buffer) ? US string_copy(s) : US s;
2941 /* SMTP, or success return from LMTP for this address. Pass back the
2942 actual host that was used. */
2944 addr->transport_return = OK;
2945 addr->more_errno = delivery_time;
2946 addr->host_used = host;
2947 addr->special_action = flag;
2948 addr->message = conf;
2949 #ifndef DISABLE_PRDR
2950 if (sx.prdr_active) addr->flags |= af_prdr_used;
2952 if (sx.peer_offered & PEER_OFFERED_CHUNKING) addr->flags |= af_chunking_used;
2955 #ifndef DISABLE_PRDR
2956 if (!sx.prdr_active)
2959 /* Update the journal. For homonymic addresses, use the base address plus
2960 the transport name. See lots of comments in deliver.c about the reasons
2961 for the complications when homonyms are involved. Just carry on after
2962 write error, as it may prove possible to update the spool file later. */
2964 if (testflag(addr, af_homonym))
2965 sprintf(CS sx.buffer, "%.500s/%s\n", addr->unique + 3, tblock->name);
2967 sprintf(CS sx.buffer, "%.500s\n", addr->unique);
2969 DEBUG(D_deliver) debug_printf("journalling %s\n", sx.buffer);
2970 len = Ustrlen(CS sx.buffer);
2971 if (write(journal_fd, sx.buffer, len) != len)
2972 log_write(0, LOG_MAIN|LOG_PANIC, "failed to write journal for "
2973 "%s: %s", sx.buffer, strerror(errno));
2977 #ifndef DISABLE_PRDR
2980 /* PRDR - get the final, overall response. For any non-success
2981 upgrade all the address statuses. */
2982 sx.ok = smtp_read_response(&sx.inblock, sx.buffer, sizeof(sx.buffer), '2',
2983 sx.ob->final_timeout);
2986 if(errno == 0 && sx.buffer[0] == '4')
2988 errno = ERRNO_DATA4XX;
2989 addrlist->more_errno |= ((sx.buffer[1] - '0')*10 + sx.buffer[2] - '0') << 8;
2991 for (addr = addrlist; addr != sx.first_addr; addr = addr->next)
2992 if (sx.buffer[0] == '5' || addr->transport_return == OK)
2993 addr->transport_return = PENDING_OK; /* allow set_errno action */
2994 goto RESPONSE_FAILED;
2997 /* Update the journal, or setup retry. */
2998 for (addr = addrlist; addr != sx.first_addr; addr = addr->next)
2999 if (addr->transport_return == OK)
3001 if (testflag(addr, af_homonym))
3002 sprintf(CS sx.buffer, "%.500s/%s\n", addr->unique + 3, tblock->name);
3004 sprintf(CS sx.buffer, "%.500s\n", addr->unique);
3006 DEBUG(D_deliver) debug_printf("journalling(PRDR) %s\n", sx.buffer);
3007 len = Ustrlen(CS sx.buffer);
3008 if (write(journal_fd, sx.buffer, len) != len)
3009 log_write(0, LOG_MAIN|LOG_PANIC, "failed to write journal for "
3010 "%s: %s", sx.buffer, strerror(errno));
3012 else if (addr->transport_return == DEFER)
3013 retry_add_item(addr, addr->address_retry_key, -2);
3017 /* Ensure the journal file is pushed out to disk. */
3019 if (EXIMfsync(journal_fd) < 0)
3020 log_write(0, LOG_MAIN|LOG_PANIC, "failed to fsync journal: %s",
3026 /* Handle general (not specific to one address) failures here. The value of ok
3027 is used to skip over this code on the falling through case. A timeout causes a
3028 deferral. Other errors may defer or fail according to the response code, and
3029 may set up a special errno value, e.g. after connection chopped, which is
3030 assumed if errno == 0 and there is no text in the buffer. If control reaches
3031 here during the setting up phase (i.e. before MAIL FROM) then always defer, as
3032 the problem is not related to this specific message. */
3037 uschar * set_message;
3043 sx.send_quit = check_response(host, &save_errno, addrlist->more_errno,
3044 sx.buffer, &code, &message, &pass_message);
3052 message = US string_sprintf("send() to %s [%s] failed: %s",
3053 host->name, host->address, strerror(save_errno));
3054 sx.send_quit = FALSE;
3062 sx.ok = FALSE; /* For when reached by GOTO */
3063 set_message = message;
3065 /* We want to handle timeouts after MAIL or "." and loss of connection after
3066 "." specially. They can indicate a problem with the sender address or with
3067 the contents of the message rather than a real error on the connection. These
3068 cases are treated in the same way as a 4xx response. This next bit of code
3069 does the classification. */
3076 message_error = TRUE;
3080 message_error = Ustrncmp(smtp_command,"MAIL",4) == 0 ||
3081 Ustrncmp(smtp_command,"end ",4) == 0;
3084 case ERRNO_SMTPCLOSED:
3085 message_error = Ustrncmp(smtp_command,"end ",4) == 0;
3089 message_error = FALSE;
3093 /* Handle the cases that are treated as message errors. These are:
3095 (a) negative response or timeout after MAIL
3096 (b) negative response after DATA
3097 (c) negative response or timeout or dropped connection after "."
3098 (d) utf8 support required and not offered
3100 It won't be a negative response or timeout after RCPT, as that is dealt
3101 with separately above. The action in all cases is to set an appropriate
3102 error code for all the addresses, but to leave yield set to OK because the
3103 host itself has not failed. Of course, it might in practice have failed
3104 when we've had a timeout, but if so, we'll discover that at the next
3105 delivery attempt. For a temporary error, set the message_defer flag, and
3106 write to the logs for information if this is not the last host. The error
3107 for the last host will be logged as part of the address's log line. */
3111 if (mua_wrapper) code = '5'; /* Force hard failure in wrapper mode */
3113 /* If there's an errno, the message contains just the identity of
3118 else /* Anything other than 5 is treated as temporary */
3122 message = US string_sprintf("%s: %s", message, strerror(save_errno));
3123 if (host->next != NULL) log_write(0, LOG_MAIN, "%s", message);
3124 msglog_line(host, message);
3125 *message_defer = TRUE;
3129 /* Otherwise, we have an I/O error or a timeout other than after MAIL or
3130 ".", or some other transportation error. We defer all addresses and yield
3131 DEFER, except for the case of failed add_headers expansion, or a transport
3132 filter failure, when the yield should be ERROR, to stop it trying other
3138 yield = (save_errno == ERRNO_CHHEADER_FAIL ||
3139 save_errno == ERRNO_FILTER_FAIL)? ERROR : DEFER;
3143 set_errno(addrlist, save_errno, set_message, set_rc, pass_message, host
3144 #ifdef EXPERIMENTAL_DSN_INFO
3145 , sx.smtp_greeting, sx.helo_response
3151 /* If all has gone well, send_quit will be set TRUE, implying we can end the
3152 SMTP session tidily. However, if there were too many addresses to send in one
3153 message (indicated by first_addr being non-NULL) we want to carry on with the
3154 rest of them. Also, it is desirable to send more than one message down the SMTP
3155 connection if there are several waiting, provided we haven't already sent so
3156 many as to hit the configured limit. The function transport_check_waiting looks
3157 for a waiting message and returns its id. Then transport_pass_socket tries to
3158 set up a continued delivery by passing the socket on to another process. The
3159 variable send_rset is FALSE if a message has just been successfully transfered.
3161 If we are already sending down a continued channel, there may be further
3162 addresses not yet delivered that are aimed at the same host, but which have not
3163 been passed in this run of the transport. In this case, continue_more will be
3164 true, and all we should do is send RSET if necessary, and return, leaving the
3167 However, if no address was disposed of, i.e. all addresses got 4xx errors, we
3168 do not want to continue with other messages down the same channel, because that
3169 can lead to looping between two or more messages, all with the same,
3170 temporarily failing address(es). [The retry information isn't updated yet, so
3171 new processes keep on trying.] We probably also don't want to try more of this
3172 message's addresses either.
3174 If we have started a TLS session, we have to end it before passing the
3175 connection to a new process. However, not all servers can handle this (Exim
3176 can), so we do not pass such a connection on if the host matches
3177 hosts_nopass_tls. */
3180 debug_printf("ok=%d send_quit=%d send_rset=%d continue_more=%d "
3181 "yield=%d first_address is %sNULL\n", sx.ok, sx.send_quit,
3182 sx.send_rset, continue_more, yield, sx.first_addr ? "not " : "");
3184 if (sx.completed_addr && sx.ok && sx.send_quit)
3187 smtp_compare_t t_compare;
3189 t_compare.tblock = tblock;
3190 t_compare.current_sender_address = sender_address;
3192 if ( sx.first_addr != NULL
3194 || ( ( tls_out.active < 0
3195 || verify_check_given_host(&sx.ob->hosts_nopass_tls, host) != OK
3198 transport_check_waiting(tblock->name, host->name,
3199 tblock->connection_max_messages, new_message_id, &more,
3200 (oicf)smtp_are_same_identities, (void*)&t_compare)
3207 if (! (sx.ok = smtp_write_command(&sx.outblock, FALSE, "RSET\r\n") >= 0))
3209 msg = US string_sprintf("send() to %s [%s] failed: %s", host->name,
3210 host->address, strerror(errno));
3211 sx.send_quit = FALSE;
3213 else if (! (sx.ok = smtp_read_response(&sx.inblock, sx.buffer,
3214 sizeof(sx.buffer), '2', sx.ob->command_timeout)))
3217 sx.send_quit = check_response(host, &errno, 0, sx.buffer, &code, &msg,
3221 DEBUG(D_transport) debug_printf("H=%s [%s] %s\n",
3222 host->name, host->address, msg);
3226 /* Either RSET was not needed, or it succeeded */
3230 if (sx.first_addr != NULL) /* More addresses still to be sent */
3231 { /* in this run of the transport */
3232 continue_sequence++; /* Causes * in logging */
3235 if (continue_more) return yield; /* More addresses for another run */
3237 /* Pass the socket to a new Exim process. Before doing so, we must shut
3238 down TLS. Not all MTAs allow for the continuation of the SMTP session
3239 when TLS is shut down. We test for this by sending a new EHLO. If we
3240 don't get a good response, we don't attempt to pass the socket on. */
3243 if (tls_out.active >= 0)
3245 tls_close(FALSE, TRUE);
3246 smtp_peer_options = smtp_peer_options_wrap;
3248 && smtp_write_command(&sx.outblock, FALSE,
3249 "EHLO %s\r\n", sx.helo_data) >= 0
3250 && smtp_read_response(&sx.inblock, sx.buffer, sizeof(sx.buffer),
3251 '2', sx.ob->command_timeout);
3255 /* If the socket is successfully passed, we mustn't send QUIT (or
3256 indeed anything!) from here. */
3258 /*XXX DSN_INFO: assume likely to do new HELO; but for greet we'll want to
3259 propagate it from the initial
3261 if (sx.ok && transport_pass_socket(tblock->name, host->name,
3262 host->address, new_message_id, sx.inblock.sock))
3263 sx.send_quit = FALSE;
3266 /* If RSET failed and there are addresses left, they get deferred. */
3268 else set_errno(sx.first_addr, errno, msg, DEFER, FALSE, host
3269 #ifdef EXPERIMENTAL_DSN_INFO
3270 , sx.smtp_greeting, sx.helo_response
3276 /* End off tidily with QUIT unless the connection has died or the socket has
3277 been passed to another process. There has been discussion on the net about what
3278 to do after sending QUIT. The wording of the RFC suggests that it is necessary
3279 to wait for a response, but on the other hand, there isn't anything one can do
3280 with an error response, other than log it. Exim used to do that. However,
3281 further discussion suggested that it is positively advantageous not to wait for
3282 the response, but to close the session immediately. This is supposed to move
3283 the TCP/IP TIME_WAIT state from the server to the client, thereby removing some
3284 load from the server. (Hosts that are both servers and clients may not see much
3285 difference, of course.) Further discussion indicated that this was safe to do
3286 on Unix systems which have decent implementations of TCP/IP that leave the
3287 connection around for a while (TIME_WAIT) after the application has gone away.
3288 This enables the response sent by the server to be properly ACKed rather than
3289 timed out, as can happen on broken TCP/IP implementations on other OS.
3291 This change is being made on 31-Jul-98. After over a year of trouble-free
3292 operation, the old commented-out code was removed on 17-Sep-99. */
3295 if (sx.send_quit) (void)smtp_write_command(&sx.outblock, FALSE, "QUIT\r\n");
3300 tls_close(FALSE, TRUE);
3303 /* Close the socket, and return the appropriate value, first setting
3304 works because the NULL setting is passed back to the calling process, and
3305 remote_max_parallel is forced to 1 when delivering over an existing connection,
3307 If all went well and continue_more is set, we shouldn't actually get here if
3308 there are further addresses, as the return above will be taken. However,
3309 writing RSET might have failed, or there may be other addresses whose hosts are
3310 specified in the transports, and therefore not visible at top level, in which
3311 case continue_more won't get set. */
3313 HDEBUG(D_transport|D_acl|D_v) debug_printf_indent(" SMTP(close)>>\n");
3316 shutdown(sx.outblock.sock, SHUT_WR);
3317 if (fcntl(sx.inblock.sock, F_SETFL, O_NONBLOCK) == 0)
3318 for (rc = 16; read(sx.inblock.sock, sx.inbuffer, sizeof(sx.inbuffer)) > 0 && rc > 0;)
3319 rc--; /* drain socket */
3321 (void)close(sx.inblock.sock);
3323 #ifndef DISABLE_EVENT
3324 (void) event_raise(tblock->event_action, US"tcp:close", NULL);
3327 continue_transport = NULL;
3328 continue_hostname = NULL;
3335 /*************************************************
3336 * Closedown entry point *
3337 *************************************************/
3339 /* This function is called when exim is passed an open smtp channel
3340 from another incarnation, but the message which it has been asked
3341 to deliver no longer exists. The channel is on stdin.
3343 We might do fancy things like looking for another message to send down
3344 the channel, but if the one we sought has gone, it has probably been
3345 delivered by some other process that itself will seek further messages,
3346 so just close down our connection.
3348 Argument: pointer to the transport instance block
3353 smtp_transport_closedown(transport_instance *tblock)
3355 smtp_transport_options_block *ob =
3356 (smtp_transport_options_block *)tblock->options_block;
3357 smtp_inblock inblock;
3358 smtp_outblock outblock;
3360 uschar inbuffer[4096];
3361 uschar outbuffer[16];
3363 inblock.sock = fileno(stdin);
3364 inblock.buffer = inbuffer;
3365 inblock.buffersize = sizeof(inbuffer);
3366 inblock.ptr = inbuffer;
3367 inblock.ptrend = inbuffer;
3369 outblock.sock = inblock.sock;
3370 outblock.buffersize = sizeof(outbuffer);
3371 outblock.buffer = outbuffer;
3372 outblock.ptr = outbuffer;
3373 outblock.cmd_count = 0;
3374 outblock.authenticating = FALSE;
3376 (void)smtp_write_command(&outblock, FALSE, "QUIT\r\n");
3377 (void)smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
3378 ob->command_timeout);
3379 (void)close(inblock.sock);
3384 /*************************************************
3385 * Prepare addresses for delivery *
3386 *************************************************/
3388 /* This function is called to flush out error settings from previous delivery
3389 attempts to other hosts. It also records whether we got here via an MX record
3390 or not in the more_errno field of the address. We are interested only in
3391 addresses that are still marked DEFER - others may have got delivered to a
3392 previously considered IP address. Set their status to PENDING_DEFER to indicate
3393 which ones are relevant this time.
3396 addrlist the list of addresses
3397 host the host we are delivering to
3399 Returns: the first address for this delivery
3402 static address_item *
3403 prepare_addresses(address_item *addrlist, host_item *host)
3405 address_item *first_addr = NULL;
3407 for (addr = addrlist; addr; addr = addr->next)
3408 if (addr->transport_return == DEFER)
3410 if (!first_addr) first_addr = addr;
3411 addr->transport_return = PENDING_DEFER;
3412 addr->basic_errno = 0;
3413 addr->more_errno = (host->mx >= 0)? 'M' : 'A';
3414 addr->message = NULL;
3416 addr->cipher = NULL;
3417 addr->ourcert = NULL;
3418 addr->peercert = NULL;
3419 addr->peerdn = NULL;
3420 addr->ocsp = OCSP_NOT_REQ;
3422 #ifdef EXPERIMENTAL_DSN_INFO
3423 addr->smtp_greeting = NULL;
3424 addr->helo_response = NULL;
3432 /*************************************************
3433 * Main entry point *
3434 *************************************************/
3436 /* See local README for interface details. As this is a remote transport, it is
3437 given a chain of addresses to be delivered in one connection, if possible. It
3438 always returns TRUE, indicating that each address has its own independent
3439 status set, except if there is a setting up problem, in which case it returns
3443 smtp_transport_entry(
3444 transport_instance *tblock, /* data for this instantiation */
3445 address_item *addrlist) /* addresses we are working on */
3449 int hosts_defer = 0;
3451 int hosts_looked_up = 0;
3452 int hosts_retry = 0;
3453 int hosts_serial = 0;
3454 int hosts_total = 0;
3455 int total_hosts_tried = 0;
3457 BOOL expired = TRUE;
3458 uschar *expanded_hosts = NULL;
3460 uschar *tid = string_sprintf("%s transport", tblock->name);
3461 smtp_transport_options_block *ob =
3462 (smtp_transport_options_block *)(tblock->options_block);
3463 host_item *hostlist = addrlist->host_list;
3464 host_item *host = NULL;
3468 debug_printf("%s transport entered\n", tblock->name);
3469 for (addr = addrlist; addr; addr = addr->next)
3470 debug_printf(" %s\n", addr->address);
3473 debug_printf("hostlist:\n");
3474 for (host = hostlist; host; host = host->next)
3475 debug_printf(" %s:%d\n", host->name, host->port);
3477 if (continue_hostname) debug_printf("already connected to %s [%s]\n",
3478 continue_hostname, continue_host_address);
3481 /* Set the flag requesting that these hosts be added to the waiting
3482 database if the delivery fails temporarily or if we are running with
3483 queue_smtp or a 2-stage queue run. This gets unset for certain
3484 kinds of error, typically those that are specific to the message. */
3486 update_waiting = TRUE;
3488 /* If a host list is not defined for the addresses - they must all have the
3489 same one in order to be passed to a single transport - or if the transport has
3490 a host list with hosts_override set, use the host list supplied with the
3491 transport. It is an error for this not to exist. */
3493 if (!hostlist || (ob->hosts_override && ob->hosts))
3497 addrlist->message = string_sprintf("%s transport called with no hosts set",
3499 addrlist->transport_return = PANIC;
3500 return FALSE; /* Only top address has status */
3503 DEBUG(D_transport) debug_printf("using the transport's hosts: %s\n",
3506 /* If the transport's host list contains no '$' characters, and we are not
3507 randomizing, it is fixed and therefore a chain of hosts can be built once
3508 and for all, and remembered for subsequent use by other calls to this
3509 transport. If, on the other hand, the host list does contain '$', or we are
3510 randomizing its order, we have to rebuild it each time. In the fixed case,
3511 as the hosts string will never be used again, it doesn't matter that we
3512 replace all the : characters with zeros. */
3516 uschar *s = ob->hosts;
3518 if (Ustrchr(s, '$') != NULL)
3520 if (!(expanded_hosts = expand_string(s)))
3522 addrlist->message = string_sprintf("failed to expand list of hosts "
3523 "\"%s\" in %s transport: %s", s, tblock->name, expand_string_message);
3524 addrlist->transport_return = search_find_defer ? DEFER : PANIC;
3525 return FALSE; /* Only top address has status */
3527 DEBUG(D_transport) debug_printf("expanded list of hosts \"%s\" to "
3528 "\"%s\"\n", s, expanded_hosts);
3532 if (ob->hosts_randomize) s = expanded_hosts = string_copy(s);
3534 host_build_hostlist(&hostlist, s, ob->hosts_randomize);
3536 /* Check that the expansion yielded something useful. */
3540 string_sprintf("%s transport has empty hosts setting", tblock->name);
3541 addrlist->transport_return = PANIC;
3542 return FALSE; /* Only top address has status */
3545 /* If there was no expansion of hosts, save the host list for
3548 if (!expanded_hosts) ob->hostlist = hostlist;
3551 /* This is not the first time this transport has been run in this delivery;
3552 the host list was built previously. */
3555 hostlist = ob->hostlist;
3558 /* The host list was supplied with the address. If hosts_randomize is set, we
3559 must sort it into a random order if it did not come from MX records and has not
3560 already been randomized (but don't bother if continuing down an existing
3563 else if (ob->hosts_randomize && hostlist->mx == MX_NONE && !continue_hostname)
3565 host_item *newlist = NULL;
3568 host_item *h = hostlist;
3569 hostlist = hostlist->next;
3571 h->sort_key = random_number(100);
3578 else if (h->sort_key < newlist->sort_key)
3585 host_item *hh = newlist;
3588 if (h->sort_key < hh->next->sort_key) break;
3596 hostlist = addrlist->host_list = newlist;
3599 /* Sort out the default port. */
3601 if (!smtp_get_port(ob->port, addrlist, &port, tid)) return FALSE;
3603 /* For each host-plus-IP-address on the list:
3605 . If this is a continued delivery and the host isn't the one with the
3606 current connection, skip.
3608 . If the status is unusable (i.e. previously failed or retry checked), skip.
3610 . If no IP address set, get the address, either by turning the name into
3611 an address, calling gethostbyname if gethostbyname is on, or by calling
3612 the DNS. The DNS may yield multiple addresses, in which case insert the
3613 extra ones into the list.
3615 . Get the retry data if not previously obtained for this address and set the
3616 field which remembers the state of this address. Skip if the retry time is
3617 not reached. If not, remember whether retry data was found. The retry string
3618 contains both the name and the IP address.
3620 . Scan the list of addresses and mark those whose status is DEFER as
3621 PENDING_DEFER. These are the only ones that will be processed in this cycle
3624 . Make a delivery attempt - addresses marked PENDING_DEFER will be tried.
3625 Some addresses may be successfully delivered, others may fail, and yet
3626 others may get temporary errors and so get marked DEFER.
3628 . The return from the delivery attempt is OK if a connection was made and a
3629 valid SMTP dialogue was completed. Otherwise it is DEFER.
3631 . If OK, add a "remove" retry item for this host/IPaddress, if any.
3633 . If fail to connect, or other defer state, add a retry item.
3635 . If there are any addresses whose status is still DEFER, carry on to the
3636 next host/IPaddress, unless we have tried the number of hosts given
3637 by hosts_max_try or hosts_max_try_hardlimit; otherwise return. Note that
3638 there is some fancy logic for hosts_max_try that means its limit can be
3639 overstepped in some circumstances.
3641 If we get to the end of the list, all hosts have deferred at least one address,
3642 or not reached their retry times. If delay_after_cutoff is unset, it requests a
3643 delivery attempt to those hosts whose last try was before the arrival time of
3644 the current message. To cope with this, we have to go round the loop a second
3645 time. After that, set the status and error data for any addresses that haven't
3646 had it set already. */
3648 for (cutoff_retry = 0;
3649 expired && cutoff_retry < (ob->delay_after_cutoff ? 1 : 2);
3652 host_item *nexthost = NULL;
3653 int unexpired_hosts_tried = 0;
3655 for (host = hostlist;
3657 && unexpired_hosts_tried < ob->hosts_max_try
3658 && total_hosts_tried < ob->hosts_max_try_hardlimit;
3664 BOOL host_is_expired = FALSE;
3665 BOOL message_defer = FALSE;
3666 BOOL some_deferred = FALSE;
3667 address_item *first_addr = NULL;
3668 uschar *interface = NULL;
3669 uschar *retry_host_key = NULL;
3670 uschar *retry_message_key = NULL;
3671 uschar *serialize_key = NULL;
3673 /* Default next host is next host. :-) But this can vary if the
3674 hosts_max_try limit is hit (see below). It may also be reset if a host
3675 address is looked up here (in case the host was multihomed). */
3677 nexthost = host->next;
3679 /* If the address hasn't yet been obtained from the host name, look it up
3680 now, unless the host is already marked as unusable. If it is marked as
3681 unusable, it means that the router was unable to find its IP address (in
3682 the DNS or wherever) OR we are in the 2nd time round the cutoff loop, and
3683 the lookup failed last time. We don't get this far if *all* MX records
3684 point to non-existent hosts; that is treated as a hard error.
3686 We can just skip this host entirely. When the hosts came from the router,
3687 the address will timeout based on the other host(s); when the address is
3688 looked up below, there is an explicit retry record added.
3690 Note that we mustn't skip unusable hosts if the address is not unset; they
3691 may be needed as expired hosts on the 2nd time round the cutoff loop. */
3695 int new_port, flags;
3698 if (host->status >= hstatus_unusable)
3700 DEBUG(D_transport) debug_printf("%s has no address and is unusable - skipping\n",
3705 DEBUG(D_transport) debug_printf("getting address for %s\n", host->name);
3707 /* The host name is permitted to have an attached port. Find it, and
3708 strip it from the name. Just remember it for now. */
3710 new_port = host_item_get_port(host);
3712 /* Count hosts looked up */
3716 /* Find by name if so configured, or if it's an IP address. We don't
3717 just copy the IP address, because we need the test-for-local to happen. */
3719 flags = HOST_FIND_BY_A;
3720 if (ob->dns_qualify_single) flags |= HOST_FIND_QUALIFY_SINGLE;
3721 if (ob->dns_search_parents) flags |= HOST_FIND_SEARCH_PARENTS;
3723 if (ob->gethostbyname || string_is_ip_address(host->name, NULL) != 0)
3724 rc = host_find_byname(host, NULL, flags, NULL, TRUE);
3726 rc = host_find_bydns(host, NULL, flags, NULL, NULL, NULL,
3727 &ob->dnssec, /* domains for request/require */
3730 /* Update the host (and any additional blocks, resulting from
3731 multihoming) with a host-specific port, if any. */
3733 for (hh = host; hh != nexthost; hh = hh->next) hh->port = new_port;
3735 /* Failure to find the host at this time (usually DNS temporary failure)
3736 is really a kind of routing failure rather than a transport failure.
3737 Therefore we add a retry item of the routing kind, not to stop us trying
3738 to look this name up here again, but to ensure the address gets timed
3739 out if the failures go on long enough. A complete failure at this point
3740 commonly points to a configuration error, but the best action is still
3741 to carry on for the next host. */
3743 if (rc == HOST_FIND_AGAIN || rc == HOST_FIND_FAILED)
3745 retry_add_item(addrlist, string_sprintf("R:%s", host->name), 0);
3747 if (rc == HOST_FIND_AGAIN) hosts_defer++; else hosts_fail++;
3748 DEBUG(D_transport) debug_printf("rc = %s for %s\n", (rc == HOST_FIND_AGAIN)?
3749 "HOST_FIND_AGAIN" : "HOST_FIND_FAILED", host->name);
3750 host->status = hstatus_unusable;
3752 for (addr = addrlist; addr; addr = addr->next)
3754 if (addr->transport_return != DEFER) continue;
3755 addr->basic_errno = ERRNO_UNKNOWNHOST;
3757 string_sprintf("failed to lookup IP address for %s", host->name);
3762 /* If the host is actually the local host, we may have a problem, or
3763 there may be some cunning configuration going on. In the problem case,
3764 log things and give up. The default transport status is already DEFER. */
3766 if (rc == HOST_FOUND_LOCAL && !ob->allow_localhost)
3768 for (addr = addrlist; addr; addr = addr->next)
3770 addr->basic_errno = 0;
3771 addr->message = string_sprintf("%s transport found host %s to be "
3772 "local", tblock->name, host->name);
3776 } /* End of block for IP address lookup */
3778 /* If this is a continued delivery, we are interested only in the host
3779 which matches the name of the existing open channel. The check is put
3780 here after the local host lookup, in case the name gets expanded as a
3781 result of the lookup. Set expired FALSE, to save the outer loop executing
3784 if ( continue_hostname
3785 && ( Ustrcmp(continue_hostname, host->name) != 0
3786 || Ustrcmp(continue_host_address, host->address) != 0
3790 continue; /* With next host */
3793 /* Reset the default next host in case a multihomed host whose addresses
3794 are not looked up till just above added to the host list. */
3796 nexthost = host->next;
3798 /* If queue_smtp is set (-odqs or the first part of a 2-stage run), or the
3799 domain is in queue_smtp_domains, we don't actually want to attempt any
3800 deliveries. When doing a queue run, queue_smtp_domains is always unset. If
3801 there is a lookup defer in queue_smtp_domains, proceed as if the domain
3802 were not in it. We don't want to hold up all SMTP deliveries! Except when
3803 doing a two-stage queue run, don't do this if forcing. */
3805 if ((!deliver_force || queue_2stage) && (queue_smtp ||
3806 match_isinlist(addrlist->domain,
3807 (const uschar **)&queue_smtp_domains, 0,
3808 &domainlist_anchor, NULL, MCL_DOMAIN, TRUE, NULL) == OK))
3811 for (addr = addrlist; addr; addr = addr->next)
3812 if (addr->transport_return == DEFER)
3813 addr->message = US"domain matches queue_smtp_domains, or -odqs set";
3814 continue; /* With next host */
3817 /* Count hosts being considered - purely for an intelligent comment
3818 if none are usable. */
3822 /* Set $host and $host address now in case they are needed for the
3823 interface expansion or the serialize_hosts check; they remain set if an
3824 actual delivery happens. */
3826 deliver_host = host->name;
3827 deliver_host_address = host->address;
3828 lookup_dnssec_authenticated = host->dnssec == DS_YES ? US"yes"
3829 : host->dnssec == DS_NO ? US"no"
3832 /* Set up a string for adding to the retry key if the port number is not
3833 the standard SMTP port. A host may have its own port setting that overrides
3836 pistring = string_sprintf(":%d", host->port == PORT_NONE
3837 ? port : host->port);
3838 if (Ustrcmp(pistring, ":25") == 0) pistring = US"";
3840 /* Select IPv4 or IPv6, and choose an outgoing interface. If the interface
3841 string is set, even if constant (as different transports can have different
3842 constant settings), we must add it to the key that is used for retries,
3843 because connections to the same host from a different interface should be
3844 treated separately. */
3846 host_af = Ustrchr(host->address, ':') == NULL ? AF_INET : AF_INET6;
3847 if ((rs = ob->interface) && *rs)
3849 if (!smtp_get_interface(rs, host_af, addrlist, &interface, tid))
3851 pistring = string_sprintf("%s/%s", pistring, interface);
3854 /* The first time round the outer loop, check the status of the host by
3855 inspecting the retry data. The second time round, we are interested only
3856 in expired hosts that haven't been tried since this message arrived. */
3858 if (cutoff_retry == 0)
3861 /* Ensure the status of the address is set by checking retry data if
3862 necessary. There may be host-specific retry data (applicable to all
3863 messages) and also data for retries of a specific message at this host.
3864 If either of these retry records are actually read, the keys used are
3865 returned to save recomputing them later. */
3867 if (exp_bool(addrlist, US"transport", tblock->name, D_transport,
3868 US"retry_include_ip_address", ob->retry_include_ip_address,
3869 ob->expand_retry_include_ip_address, &incl_ip) != OK)
3870 continue; /* with next host */
3872 host_is_expired = retry_check_address(addrlist->domain, host, pistring,
3873 incl_ip, &retry_host_key, &retry_message_key);
3875 DEBUG(D_transport) debug_printf("%s [%s]%s status = %s\n", host->name,
3876 (host->address == NULL)? US"" : host->address, pistring,
3877 (host->status == hstatus_usable)? "usable" :
3878 (host->status == hstatus_unusable)? "unusable" :
3879 (host->status == hstatus_unusable_expired)? "unusable (expired)" : "?");
3881 /* Skip this address if not usable at this time, noting if it wasn't
3882 actually expired, both locally and in the address. */
3884 switch (host->status)
3886 case hstatus_unusable:
3888 setflag(addrlist, af_retry_skipped);
3891 case hstatus_unusable_expired:
3894 case hwhy_retry: hosts_retry++; break;
3895 case hwhy_failed: hosts_fail++; break;
3896 case hwhy_deferred: hosts_defer++; break;
3899 /* If there was a retry message key, implying that previously there
3900 was a message-specific defer, we don't want to update the list of
3901 messages waiting for these hosts. */
3903 if (retry_message_key) update_waiting = FALSE;
3904 continue; /* With the next host or IP address */
3908 /* Second time round the loop: if the address is set but expired, and
3909 the message is newer than the last try, let it through. */
3914 || host->status != hstatus_unusable_expired
3915 || host->last_try > received_time)
3917 DEBUG(D_transport) debug_printf("trying expired host %s [%s]%s\n",
3918 host->name, host->address, pistring);
3919 host_is_expired = TRUE;
3922 /* Setting "expired=FALSE" doesn't actually mean not all hosts are expired;
3923 it remains TRUE only if all hosts are expired and none are actually tried.
3928 /* If this host is listed as one to which access must be serialized,
3929 see if another Exim process has a connection to it, and if so, skip
3930 this host. If not, update the database to record our connection to it
3931 and remember this for later deletion. Do not do any of this if we are
3932 sending the message down a pre-existing connection. */
3934 if ( !continue_hostname
3935 && verify_check_given_host(&ob->serialize_hosts, host) == OK)
3937 serialize_key = string_sprintf("host-serialize-%s", host->name);
3938 if (!enq_start(serialize_key, 1))
3941 debug_printf("skipping host %s because another Exim process "
3942 "is connected to it\n", host->name);
3948 /* OK, we have an IP address that is not waiting for its retry time to
3949 arrive (it might be expired) OR (second time round the loop) we have an
3950 expired host that hasn't been tried since the message arrived. Have a go
3951 at delivering the message to it. First prepare the addresses by flushing
3952 out the result of previous attempts, and finding the first address that
3953 is still to be delivered. */
3955 first_addr = prepare_addresses(addrlist, host);
3957 DEBUG(D_transport) debug_printf("delivering %s to %s [%s] (%s%s)\n",
3958 message_id, host->name, host->address, addrlist->address,
3959 addrlist->next ? ", ..." : "");
3961 set_process_info("delivering %s to %s [%s] (%s%s)",
3962 message_id, host->name, host->address, addrlist->address,
3963 addrlist->next ? ", ..." : "");
3965 /* This is not for real; don't do the delivery. If there are
3966 any remaining hosts, list them. */
3971 set_errno_nohost(addrlist, 0, NULL, OK, FALSE);
3972 for (addr = addrlist; addr; addr = addr->next)
3974 addr->host_used = host;
3975 addr->special_action = '*';
3976 addr->message = US"delivery bypassed by -N option";
3980 debug_printf("*** delivery by %s transport bypassed by -N option\n"
3981 "*** host and remaining hosts:\n", tblock->name);
3982 for (host2 = host; host2; host2 = host2->next)
3983 debug_printf(" %s [%s]\n", host2->name,
3984 host2->address ? host2->address : US"unset");
3989 /* This is for real. If the host is expired, we don't count it for
3990 hosts_max_retry. This ensures that all hosts must expire before an address
3991 is timed out, unless hosts_max_try_hardlimit (which protects against
3992 lunatic DNS configurations) is reached.
3994 If the host is not expired and we are about to hit the hosts_max_retry
3995 limit, check to see if there is a subsequent hosts with a different MX
3996 value. If so, make that the next host, and don't count this one. This is a
3997 heuristic to make sure that different MXs do get tried. With a normal kind
3998 of retry rule, they would get tried anyway when the earlier hosts were
3999 delayed, but if the domain has a "retry every time" type of rule - as is
4000 often used for the the very large ISPs, that won't happen. */
4005 /* Make a copy of the host if it is local to this invocation
4006 of the transport. */
4010 thost = store_get(sizeof(host_item));
4012 thost->name = string_copy(host->name);
4013 thost->address = string_copy(host->address);
4018 if (!host_is_expired && ++unexpired_hosts_tried >= ob->hosts_max_try)
4022 debug_printf("hosts_max_try limit reached with this host\n");
4023 for (h = host; h; h = h->next) if (h->mx != host->mx)
4026 unexpired_hosts_tried--;
4027 DEBUG(D_transport) debug_printf("however, a higher MX host exists "
4028 "and will be tried\n");
4033 /* Attempt the delivery. */
4035 total_hosts_tried++;
4036 rc = smtp_deliver(addrlist, thost, host_af, port, interface, tblock,
4037 &message_defer, FALSE);
4040 OK => connection made, each address contains its result;
4041 message_defer is set for message-specific defers (when all
4042 recipients are marked defer)
4043 DEFER => there was a non-message-specific delivery problem;
4044 ERROR => there was a problem setting up the arguments for a filter,
4045 or there was a problem with expanding added headers
4048 /* If the result is not OK, there was a non-message-specific problem.
4049 If the result is DEFER, we need to write to the logs saying what happened
4050 for this particular host, except in the case of authentication and TLS
4051 failures, where the log has already been written. If all hosts defer a
4052 general message is written at the end. */
4054 if (rc == DEFER && first_addr->basic_errno != ERRNO_AUTHFAIL
4055 && first_addr->basic_errno != ERRNO_TLSFAILURE)
4056 write_logs(first_addr, host);
4058 #ifndef DISABLE_EVENT
4060 deferred_event_raise(first_addr, host);
4063 /* If STARTTLS was accepted, but there was a failure in setting up the
4064 TLS session (usually a certificate screwup), and the host is not in
4065 hosts_require_tls, and tls_tempfail_tryclear is true, try again, with
4066 TLS forcibly turned off. We have to start from scratch with a new SMTP
4067 connection. That's why the retry is done from here, not from within
4068 smtp_deliver(). [Rejections of STARTTLS itself don't screw up the
4069 session, so the in-clear transmission after those errors, if permitted,
4070 happens inside smtp_deliver().] */
4074 && first_addr->basic_errno == ERRNO_TLSFAILURE
4075 && ob->tls_tempfail_tryclear
4076 && verify_check_given_host(&ob->hosts_require_tls, host) != OK
4079 log_write(0, LOG_MAIN, "TLS session failure: delivering unencrypted "
4080 "to %s [%s] (not in hosts_require_tls)", host->name, host->address);
4081 first_addr = prepare_addresses(addrlist, host);
4082 rc = smtp_deliver(addrlist, thost, host_af, port, interface, tblock,
4083 &message_defer, TRUE);
4084 if (rc == DEFER && first_addr->basic_errno != ERRNO_AUTHFAIL)
4085 write_logs(first_addr, host);
4086 # ifndef DISABLE_EVENT
4088 deferred_event_raise(first_addr, host);
4091 #endif /*SUPPORT_TLS*/
4094 /* Delivery attempt finished */
4096 rs = rc == OK ? US"OK"
4097 : rc == DEFER ? US"DEFER"
4098 : rc == ERROR ? US"ERROR"
4101 set_process_info("delivering %s: just tried %s [%s] for %s%s: result %s",
4102 message_id, host->name, host->address, addrlist->address,
4103 addrlist->next ? " (& others)" : "", rs);
4105 /* Release serialization if set up */
4107 if (serialize_key) enq_end(serialize_key);
4109 /* If the result is DEFER, or if a host retry record is known to exist, we
4110 need to add an item to the retry chain for updating the retry database
4111 at the end of delivery. We only need to add the item to the top address,
4112 of course. Also, if DEFER, we mark the IP address unusable so as to skip it
4113 for any other delivery attempts using the same address. (It is copied into
4114 the unusable tree at the outer level, so even if different address blocks
4115 contain the same address, it still won't get tried again.) */
4117 if (rc == DEFER || retry_host_key)
4119 int delete_flag = rc != DEFER ? rf_delete : 0;
4120 if (!retry_host_key)
4123 if (exp_bool(addrlist, US"transport", tblock->name, D_transport,
4124 US"retry_include_ip_address", ob->retry_include_ip_address,
4125 ob->expand_retry_include_ip_address, &incl_ip) != OK)
4126 incl_ip = TRUE; /* error; use most-specific retry record */
4128 retry_host_key = incl_ip
4129 ? string_sprintf("T:%S:%s%s", host->name, host->address, pistring)
4130 : string_sprintf("T:%S%s", host->name, pistring);
4133 /* If a delivery of another message over an existing SMTP connection
4134 yields DEFER, we do NOT set up retry data for the host. This covers the
4135 case when there are delays in routing the addresses in the second message
4136 that are so long that the server times out. This is alleviated by not
4137 routing addresses that previously had routing defers when handling an
4138 existing connection, but even so, this case may occur (e.g. if a
4139 previously happily routed address starts giving routing defers). If the
4140 host is genuinely down, another non-continued message delivery will
4141 notice it soon enough. */
4143 if (delete_flag != 0 || !continue_hostname)
4144 retry_add_item(first_addr, retry_host_key, rf_host | delete_flag);
4146 /* We may have tried an expired host, if its retry time has come; ensure
4147 the status reflects the expiry for the benefit of any other addresses. */
4151 host->status = host_is_expired
4152 ? hstatus_unusable_expired : hstatus_unusable;
4153 host->why = hwhy_deferred;
4157 /* If message_defer is set (host was OK, but every recipient got deferred
4158 because of some message-specific problem), or if that had happened
4159 previously so that a message retry key exists, add an appropriate item
4160 to the retry chain. Note that if there was a message defer but now there is
4161 a host defer, the message defer record gets deleted. That seems perfectly
4162 reasonable. Also, stop the message from being remembered as waiting
4163 for specific hosts. */
4165 if (message_defer || retry_message_key)
4167 int delete_flag = message_defer ? 0 : rf_delete;
4168 if (!retry_message_key)
4171 if (exp_bool(addrlist, US"transport", tblock->name, D_transport,
4172 US"retry_include_ip_address", ob->retry_include_ip_address,
4173 ob->expand_retry_include_ip_address, &incl_ip) != OK)
4174 incl_ip = TRUE; /* error; use most-specific retry record */
4176 retry_message_key = incl_ip
4177 ? string_sprintf("T:%S:%s%s:%s", host->name, host->address, pistring,
4179 : string_sprintf("T:%S%s:%s", host->name, pistring, message_id);
4181 retry_add_item(addrlist, retry_message_key,
4182 rf_message | rf_host | delete_flag);
4183 update_waiting = FALSE;
4186 /* Any return other than DEFER (that is, OK or ERROR) means that the
4187 addresses have got their final statuses filled in for this host. In the OK
4188 case, see if any of them are deferred. */
4191 for (addr = addrlist; addr; addr = addr->next)
4192 if (addr->transport_return == DEFER)
4194 some_deferred = TRUE;
4198 /* If no addresses deferred or the result was ERROR, return. We do this for
4199 ERROR because a failing filter set-up or add_headers expansion is likely to
4200 fail for any host we try. */
4202 if (rc == ERROR || (rc == OK && !some_deferred))
4204 DEBUG(D_transport) debug_printf("Leaving %s transport\n", tblock->name);
4205 return TRUE; /* Each address has its status */
4208 /* If the result was DEFER or some individual addresses deferred, let
4209 the loop run to try other hosts with the deferred addresses, except for the
4210 case when we were trying to deliver down an existing channel and failed.
4211 Don't try any other hosts in this case. */
4213 if (continue_hostname) break;
4215 /* If the whole delivery, or some individual addresses, were deferred and
4216 there are more hosts that could be tried, do not count this host towards
4217 the hosts_max_try limit if the age of the message is greater than the
4218 maximum retry time for this host. This means we may try try all hosts,
4219 ignoring the limit, when messages have been around for some time. This is
4220 important because if we don't try all hosts, the address will never time
4221 out. NOTE: this does not apply to hosts_max_try_hardlimit. */
4223 if ((rc == DEFER || some_deferred) && nexthost)
4226 retry_config *retry = retry_find_config(host->name, NULL, 0, 0);
4228 if (retry && retry->rules)
4230 retry_rule *last_rule;
4231 for (last_rule = retry->rules;
4233 last_rule = last_rule->next);
4234 timedout = time(NULL) - received_time > last_rule->timeout;
4236 else timedout = TRUE; /* No rule => timed out */
4240 unexpired_hosts_tried--;
4241 DEBUG(D_transport) debug_printf("temporary delivery error(s) override "
4242 "hosts_max_try (message older than host's retry time)\n");
4245 } /* End of loop for trying multiple hosts. */
4247 /* This is the end of the loop that repeats iff expired is TRUE and
4248 ob->delay_after_cutoff is FALSE. The second time round we will
4249 try those hosts that haven't been tried since the message arrived. */
4253 debug_printf("all IP addresses skipped or deferred at least one address\n");
4254 if (expired && !ob->delay_after_cutoff && cutoff_retry == 0)
4255 debug_printf("retrying IP addresses not tried since message arrived\n");
4260 /* Get here if all IP addresses are skipped or defer at least one address. In
4261 MUA wrapper mode, this will happen only for connection or other non-message-
4262 specific failures. Force the delivery status for all addresses to FAIL. */
4266 for (addr = addrlist; addr; addr = addr->next)
4267 addr->transport_return = FAIL;
4271 /* In the normal, non-wrapper case, add a standard message to each deferred
4272 address if there hasn't been an error, that is, if it hasn't actually been
4273 tried this time. The variable "expired" will be FALSE if any deliveries were
4274 actually tried, or if there was at least one host that was not expired. That
4275 is, it is TRUE only if no deliveries were tried and all hosts were expired. If
4276 a delivery has been tried, an error code will be set, and the failing of the
4277 message is handled by the retry code later.
4279 If queue_smtp is set, or this transport was called to send a subsequent message
4280 down an existing TCP/IP connection, and something caused the host not to be
4281 found, we end up here, but can detect these cases and handle them specially. */
4283 for (addr = addrlist; addr; addr = addr->next)
4285 /* If host is not NULL, it means that we stopped processing the host list
4286 because of hosts_max_try or hosts_max_try_hardlimit. In the former case, this
4287 means we need to behave as if some hosts were skipped because their retry
4288 time had not come. Specifically, this prevents the address from timing out.
4289 However, if we have hit hosts_max_try_hardlimit, we want to behave as if all
4290 hosts were tried. */
4293 if (total_hosts_tried >= ob->hosts_max_try_hardlimit)
4296 debug_printf("hosts_max_try_hardlimit reached: behave as if all "
4297 "hosts were tried\n");
4302 debug_printf("hosts_max_try limit caused some hosts to be skipped\n");
4303 setflag(addr, af_retry_skipped);
4306 if (queue_smtp) /* no deliveries attempted */
4308 addr->transport_return = DEFER;
4309 addr->basic_errno = 0;
4310 addr->message = US"SMTP delivery explicitly queued";
4313 else if ( addr->transport_return == DEFER
4314 && (addr->basic_errno == ERRNO_UNKNOWNERROR || addr->basic_errno == 0)
4318 addr->basic_errno = ERRNO_HRETRY;
4319 if (continue_hostname)
4320 addr->message = US"no host found for existing SMTP connection";
4323 setflag(addr, af_pass_message); /* This is not a security risk */
4324 addr->message = string_sprintf(
4325 "all hosts%s have been failing for a long time %s",
4326 addr->domain ? string_sprintf(" for '%s'", addr->domain) : US"",
4327 ob->delay_after_cutoff
4328 ? US"(and retry time not reached)"
4329 : US"and were last tried after this message arrived");
4331 /* If we are already using fallback hosts, or there are no fallback hosts
4332 defined, convert the result to FAIL to cause a bounce. */
4334 if (addr->host_list == addr->fallback_hosts || !addr->fallback_hosts)
4335 addr->transport_return = FAIL;
4340 if (hosts_retry == hosts_total)
4341 s = "retry time not reached for any host%s";
4342 else if (hosts_fail == hosts_total)
4343 s = "all host address lookups%s failed permanently";
4344 else if (hosts_defer == hosts_total)
4345 s = "all host address lookups%s failed temporarily";
4346 else if (hosts_serial == hosts_total)
4347 s = "connection limit reached for all hosts%s";
4348 else if (hosts_fail+hosts_defer == hosts_total)
4349 s = "all host address lookups%s failed";
4351 s = "some host address lookups failed and retry time "
4352 "not reached for other hosts or connection limit reached%s";
4354 addr->message = string_sprintf(s,
4355 addr->domain ? string_sprintf(" for '%s'", addr->domain) : US"");
4360 /* Update the database which keeps information about which messages are waiting
4361 for which hosts to become available. For some message-specific errors, the
4362 update_waiting flag is turned off because we don't want follow-on deliveries in
4363 those cases. If this transport instance is explicitly limited to one message
4364 per connection then follow-on deliveries are not possible and there's no need
4365 to create/update the per-transport wait-<transport_name> database. */
4367 if (update_waiting && tblock->connection_max_messages != 1)
4368 transport_update_waiting(hostlist, tblock->name);
4372 DEBUG(D_transport) debug_printf("Leaving %s transport\n", tblock->name);
4374 return TRUE; /* Each address has its status */
4379 /* End of transport/smtp.c */