1 /*************************************************
2 * Exim - an Internet mail transport agent *
3 *************************************************/
5 /* Copyright (c) University of Cambridge 1995 - 2018 */
6 /* See the file NOTICE for conditions of use and distribution. */
12 /* Options specific to the smtp transport. This transport also supports LMTP
13 over TCP/IP. The options must be in alphabetic order (note that "_" comes
14 before the lower case letters). Some live in the transport_instance block so as
15 to be publicly visible; these are flagged with opt_public. */
17 optionlist smtp_transport_options[] = {
18 { "*expand_multi_domain", opt_stringptr | opt_hidden | opt_public,
19 (void *)offsetof(transport_instance, expand_multi_domain) },
20 { "*expand_retry_include_ip_address", opt_stringptr | opt_hidden,
21 (void *)(offsetof(smtp_transport_options_block, expand_retry_include_ip_address)) },
23 { "address_retry_include_sender", opt_bool,
24 (void *)offsetof(smtp_transport_options_block, address_retry_include_sender) },
25 { "allow_localhost", opt_bool,
26 (void *)offsetof(smtp_transport_options_block, allow_localhost) },
27 #ifdef EXPERIMENTAL_ARC
28 { "arc_sign", opt_stringptr,
29 (void *)offsetof(smtp_transport_options_block, arc_sign) },
31 { "authenticated_sender", opt_stringptr,
32 (void *)offsetof(smtp_transport_options_block, authenticated_sender) },
33 { "authenticated_sender_force", opt_bool,
34 (void *)offsetof(smtp_transport_options_block, authenticated_sender_force) },
35 { "command_timeout", opt_time,
36 (void *)offsetof(smtp_transport_options_block, command_timeout) },
37 { "connect_timeout", opt_time,
38 (void *)offsetof(smtp_transport_options_block, connect_timeout) },
39 { "connection_max_messages", opt_int | opt_public,
40 (void *)offsetof(transport_instance, connection_max_messages) },
42 { "dane_require_tls_ciphers", opt_stringptr,
43 (void *)offsetof(smtp_transport_options_block, dane_require_tls_ciphers) },
45 { "data_timeout", opt_time,
46 (void *)offsetof(smtp_transport_options_block, data_timeout) },
47 { "delay_after_cutoff", opt_bool,
48 (void *)offsetof(smtp_transport_options_block, delay_after_cutoff) },
50 { "dkim_canon", opt_stringptr,
51 (void *)offsetof(smtp_transport_options_block, dkim.dkim_canon) },
52 { "dkim_domain", opt_stringptr,
53 (void *)offsetof(smtp_transport_options_block, dkim.dkim_domain) },
54 { "dkim_hash", opt_stringptr,
55 (void *)offsetof(smtp_transport_options_block, dkim.dkim_hash) },
56 { "dkim_identity", opt_stringptr,
57 (void *)offsetof(smtp_transport_options_block, dkim.dkim_identity) },
58 { "dkim_private_key", opt_stringptr,
59 (void *)offsetof(smtp_transport_options_block, dkim.dkim_private_key) },
60 { "dkim_selector", opt_stringptr,
61 (void *)offsetof(smtp_transport_options_block, dkim.dkim_selector) },
62 { "dkim_sign_headers", opt_stringptr,
63 (void *)offsetof(smtp_transport_options_block, dkim.dkim_sign_headers) },
64 { "dkim_strict", opt_stringptr,
65 (void *)offsetof(smtp_transport_options_block, dkim.dkim_strict) },
66 { "dkim_timestamps", opt_stringptr,
67 (void *)offsetof(smtp_transport_options_block, dkim.dkim_timestamps) },
69 { "dns_qualify_single", opt_bool,
70 (void *)offsetof(smtp_transport_options_block, dns_qualify_single) },
71 { "dns_search_parents", opt_bool,
72 (void *)offsetof(smtp_transport_options_block, dns_search_parents) },
73 { "dnssec_request_domains", opt_stringptr,
74 (void *)offsetof(smtp_transport_options_block, dnssec.request) },
75 { "dnssec_require_domains", opt_stringptr,
76 (void *)offsetof(smtp_transport_options_block, dnssec.require) },
77 { "dscp", opt_stringptr,
78 (void *)offsetof(smtp_transport_options_block, dscp) },
79 { "fallback_hosts", opt_stringptr,
80 (void *)offsetof(smtp_transport_options_block, fallback_hosts) },
81 { "final_timeout", opt_time,
82 (void *)offsetof(smtp_transport_options_block, final_timeout) },
83 { "gethostbyname", opt_bool,
84 (void *)offsetof(smtp_transport_options_block, gethostbyname) },
85 { "helo_data", opt_stringptr,
86 (void *)offsetof(smtp_transport_options_block, helo_data) },
87 { "hosts", opt_stringptr,
88 (void *)offsetof(smtp_transport_options_block, hosts) },
89 { "hosts_avoid_esmtp", opt_stringptr,
90 (void *)offsetof(smtp_transport_options_block, hosts_avoid_esmtp) },
91 { "hosts_avoid_pipelining", opt_stringptr,
92 (void *)offsetof(smtp_transport_options_block, hosts_avoid_pipelining) },
94 { "hosts_avoid_tls", opt_stringptr,
95 (void *)offsetof(smtp_transport_options_block, hosts_avoid_tls) },
97 { "hosts_max_try", opt_int,
98 (void *)offsetof(smtp_transport_options_block, hosts_max_try) },
99 { "hosts_max_try_hardlimit", opt_int,
100 (void *)offsetof(smtp_transport_options_block, hosts_max_try_hardlimit) },
102 { "hosts_nopass_tls", opt_stringptr,
103 (void *)offsetof(smtp_transport_options_block, hosts_nopass_tls) },
104 { "hosts_noproxy_tls", opt_stringptr,
105 (void *)offsetof(smtp_transport_options_block, hosts_noproxy_tls) },
107 { "hosts_override", opt_bool,
108 (void *)offsetof(smtp_transport_options_block, hosts_override) },
109 { "hosts_randomize", opt_bool,
110 (void *)offsetof(smtp_transport_options_block, hosts_randomize) },
111 #if defined(SUPPORT_TLS) && !defined(DISABLE_OCSP)
112 { "hosts_request_ocsp", opt_stringptr,
113 (void *)offsetof(smtp_transport_options_block, hosts_request_ocsp) },
115 { "hosts_require_auth", opt_stringptr,
116 (void *)offsetof(smtp_transport_options_block, hosts_require_auth) },
119 { "hosts_require_dane", opt_stringptr,
120 (void *)offsetof(smtp_transport_options_block, hosts_require_dane) },
122 # ifndef DISABLE_OCSP
123 { "hosts_require_ocsp", opt_stringptr,
124 (void *)offsetof(smtp_transport_options_block, hosts_require_ocsp) },
126 { "hosts_require_tls", opt_stringptr,
127 (void *)offsetof(smtp_transport_options_block, hosts_require_tls) },
129 { "hosts_try_auth", opt_stringptr,
130 (void *)offsetof(smtp_transport_options_block, hosts_try_auth) },
131 { "hosts_try_chunking", opt_stringptr,
132 (void *)offsetof(smtp_transport_options_block, hosts_try_chunking) },
133 #if defined(SUPPORT_TLS) && defined(SUPPORT_DANE)
134 { "hosts_try_dane", opt_stringptr,
135 (void *)offsetof(smtp_transport_options_block, hosts_try_dane) },
137 { "hosts_try_fastopen", opt_stringptr,
138 (void *)offsetof(smtp_transport_options_block, hosts_try_fastopen) },
140 { "hosts_try_prdr", opt_stringptr,
141 (void *)offsetof(smtp_transport_options_block, hosts_try_prdr) },
144 { "hosts_verify_avoid_tls", opt_stringptr,
145 (void *)offsetof(smtp_transport_options_block, hosts_verify_avoid_tls) },
147 { "interface", opt_stringptr,
148 (void *)offsetof(smtp_transport_options_block, interface) },
149 { "keepalive", opt_bool,
150 (void *)offsetof(smtp_transport_options_block, keepalive) },
151 { "lmtp_ignore_quota", opt_bool,
152 (void *)offsetof(smtp_transport_options_block, lmtp_ignore_quota) },
153 { "max_rcpt", opt_int | opt_public,
154 (void *)offsetof(transport_instance, max_addresses) },
155 { "multi_domain", opt_expand_bool | opt_public,
156 (void *)offsetof(transport_instance, multi_domain) },
157 { "port", opt_stringptr,
158 (void *)offsetof(smtp_transport_options_block, port) },
159 { "protocol", opt_stringptr,
160 (void *)offsetof(smtp_transport_options_block, protocol) },
161 { "retry_include_ip_address", opt_expand_bool,
162 (void *)offsetof(smtp_transport_options_block, retry_include_ip_address) },
163 { "serialize_hosts", opt_stringptr,
164 (void *)offsetof(smtp_transport_options_block, serialize_hosts) },
165 { "size_addition", opt_int,
166 (void *)offsetof(smtp_transport_options_block, size_addition) }
168 ,{ "socks_proxy", opt_stringptr,
169 (void *)offsetof(smtp_transport_options_block, socks_proxy) }
172 ,{ "tls_certificate", opt_stringptr,
173 (void *)offsetof(smtp_transport_options_block, tls_certificate) },
174 { "tls_crl", opt_stringptr,
175 (void *)offsetof(smtp_transport_options_block, tls_crl) },
176 { "tls_dh_min_bits", opt_int,
177 (void *)offsetof(smtp_transport_options_block, tls_dh_min_bits) },
178 { "tls_privatekey", opt_stringptr,
179 (void *)offsetof(smtp_transport_options_block, tls_privatekey) },
180 { "tls_require_ciphers", opt_stringptr,
181 (void *)offsetof(smtp_transport_options_block, tls_require_ciphers) },
182 { "tls_sni", opt_stringptr,
183 (void *)offsetof(smtp_transport_options_block, tls_sni) },
184 { "tls_tempfail_tryclear", opt_bool,
185 (void *)offsetof(smtp_transport_options_block, tls_tempfail_tryclear) },
186 { "tls_try_verify_hosts", opt_stringptr,
187 (void *)offsetof(smtp_transport_options_block, tls_try_verify_hosts) },
188 { "tls_verify_cert_hostnames", opt_stringptr,
189 (void *)offsetof(smtp_transport_options_block,tls_verify_cert_hostnames)},
190 { "tls_verify_certificates", opt_stringptr,
191 (void *)offsetof(smtp_transport_options_block, tls_verify_certificates) },
192 { "tls_verify_hosts", opt_stringptr,
193 (void *)offsetof(smtp_transport_options_block, tls_verify_hosts) }
197 /* Size of the options list. An extern variable has to be used so that its
198 address can appear in the tables drtables.c. */
200 int smtp_transport_options_count =
201 sizeof(smtp_transport_options)/sizeof(optionlist);
207 smtp_transport_options_block smtp_transport_option_defaults = {0};
208 void smtp_transport_init(transport_instance *tblock) {}
209 BOOL smtp_transport_entry(transport_instance *tblock, address_item *addr) {return FALSE;}
210 void smtp_transport_closedown(transport_instance *tblock) {}
212 #else /*!MACRO_PREDEF*/
215 /* Default private options block for the smtp transport. */
217 smtp_transport_options_block smtp_transport_option_defaults = {
219 .fallback_hosts = NULL,
221 .fallback_hostlist = NULL,
222 .helo_data = US"$primary_hostname",
225 .protocol = US"smtp",
227 .serialize_hosts = NULL,
228 .hosts_try_auth = NULL,
229 .hosts_require_auth = NULL,
230 .hosts_try_chunking = US"*",
232 .hosts_try_dane = NULL,
233 .hosts_require_dane = NULL,
234 .dane_require_tls_ciphers = NULL,
236 .hosts_try_fastopen = NULL,
238 .hosts_try_prdr = US"*",
241 .hosts_request_ocsp = US"*", /* hosts_request_ocsp (except under DANE; tls_client_start()) */
242 .hosts_require_ocsp = NULL,
244 .hosts_require_tls = NULL,
245 .hosts_avoid_tls = NULL,
246 .hosts_verify_avoid_tls = NULL,
247 .hosts_avoid_pipelining = NULL,
248 .hosts_avoid_esmtp = NULL,
250 .hosts_nopass_tls = NULL,
251 .hosts_noproxy_tls = US"*",
253 .command_timeout = 5*60,
254 .connect_timeout = 5*60,
255 .data_timeout = 5*60,
256 .final_timeout = 10*60,
257 .size_addition = 1024,
259 .hosts_max_try_hardlimit = 50,
260 .address_retry_include_sender = TRUE,
261 .allow_localhost = FALSE,
262 .authenticated_sender_force = FALSE,
263 .gethostbyname = FALSE,
264 .dns_qualify_single = TRUE,
265 .dns_search_parents = FALSE,
266 .dnssec = { .request=NULL, .require=NULL },
267 .delay_after_cutoff = TRUE,
268 .hosts_override = FALSE,
269 .hosts_randomize = FALSE,
271 .lmtp_ignore_quota = FALSE,
272 .expand_retry_include_ip_address = NULL,
273 .retry_include_ip_address = TRUE,
278 .tls_certificate = NULL,
280 .tls_privatekey = NULL,
281 .tls_require_ciphers = NULL,
283 .tls_verify_certificates = US"system",
284 .tls_dh_min_bits = EXIM_CLIENT_DH_DEFAULT_MIN_BITS,
285 .tls_tempfail_tryclear = TRUE,
286 .tls_verify_hosts = NULL,
287 .tls_try_verify_hosts = US"*",
288 .tls_verify_cert_hostnames = US"*",
292 {.dkim_domain = NULL,
293 .dkim_identity = NULL,
294 .dkim_private_key = NULL,
295 .dkim_selector = NULL,
297 .dkim_sign_headers = NULL,
299 .dkim_hash = US"sha256",
300 .dkim_timestamps = NULL,
301 .dot_stuffed = FALSE,
302 .force_bodyhash = FALSE,
303 # ifdef EXPERIMENTAL_ARC
304 .arc_signspec = NULL,
307 # ifdef EXPERIMENTAL_ARC
313 /* some DSN flags for use later */
315 static int rf_list[] = {rf_notify_never, rf_notify_success,
316 rf_notify_failure, rf_notify_delay };
318 static uschar *rf_names[] = { US"NEVER", US"SUCCESS", US"FAILURE", US"DELAY" };
324 static uschar *smtp_command; /* Points to last cmd for error messages */
325 static uschar *mail_command; /* Points to MAIL cmd for error messages */
326 static uschar *data_command = US""; /* Points to DATA cmd for error messages */
327 static BOOL update_waiting; /* TRUE to update the "wait" database */
329 /*XXX move to smtp_context */
330 static BOOL pipelining_active; /* current transaction is in pipe mode */
333 /*************************************************
334 * Setup entry point *
335 *************************************************/
337 /* This function is called when the transport is about to be used,
338 but before running it in a sub-process. It is used for two things:
340 (1) To set the fallback host list in addresses, when delivering.
341 (2) To pass back the interface, port, protocol, and other options, for use
342 during callout verification.
345 tblock pointer to the transport instance block
346 addrlist list of addresses about to be transported
347 tf if not NULL, pointer to block in which to return options
348 uid the uid that will be set (not used)
349 gid the gid that will be set (not used)
350 errmsg place for error message (not used)
352 Returns: OK always (FAIL, DEFER not used)
356 smtp_transport_setup(transport_instance *tblock, address_item *addrlist,
357 transport_feedback *tf, uid_t uid, gid_t gid, uschar **errmsg)
359 smtp_transport_options_block *ob =
360 (smtp_transport_options_block *)(tblock->options_block);
362 errmsg = errmsg; /* Keep picky compilers happy */
366 /* Pass back options if required. This interface is getting very messy. */
370 tf->interface = ob->interface;
372 tf->protocol = ob->protocol;
373 tf->hosts = ob->hosts;
374 tf->hosts_override = ob->hosts_override;
375 tf->hosts_randomize = ob->hosts_randomize;
376 tf->gethostbyname = ob->gethostbyname;
377 tf->qualify_single = ob->dns_qualify_single;
378 tf->search_parents = ob->dns_search_parents;
379 tf->helo_data = ob->helo_data;
382 /* Set the fallback host list for all the addresses that don't have fallback
383 host lists, provided that the local host wasn't present in the original host
386 if (!testflag(addrlist, af_local_host_removed))
387 for (; addrlist; addrlist = addrlist->next)
388 if (!addrlist->fallback_hosts) addrlist->fallback_hosts = ob->fallback_hostlist;
395 /*************************************************
396 * Initialization entry point *
397 *************************************************/
399 /* Called for each instance, after its options have been read, to
400 enable consistency checks to be done, or anything else that needs
403 Argument: pointer to the transport instance block
408 smtp_transport_init(transport_instance *tblock)
410 smtp_transport_options_block *ob =
411 (smtp_transport_options_block *)(tblock->options_block);
413 /* Retry_use_local_part defaults FALSE if unset */
415 if (tblock->retry_use_local_part == TRUE_UNSET)
416 tblock->retry_use_local_part = FALSE;
418 /* Set the default port according to the protocol */
420 if (ob->port == NULL)
421 ob->port = (strcmpic(ob->protocol, US"lmtp") == 0)? US"lmtp" :
422 (strcmpic(ob->protocol, US"smtps") == 0)? US"smtps" : US"smtp";
424 /* Set up the setup entry point, to be called before subprocesses for this
427 tblock->setup = smtp_transport_setup;
429 /* Complain if any of the timeouts are zero. */
431 if (ob->command_timeout <= 0 || ob->data_timeout <= 0 ||
432 ob->final_timeout <= 0)
433 log_write(0, LOG_PANIC_DIE|LOG_CONFIG,
434 "command, data, or final timeout value is zero for %s transport",
437 /* If hosts_override is set and there are local hosts, set the global
438 flag that stops verify from showing router hosts. */
440 if (ob->hosts_override && ob->hosts != NULL) tblock->overrides_hosts = TRUE;
442 /* If there are any fallback hosts listed, build a chain of host items
443 for them, but do not do any lookups at this time. */
445 host_build_hostlist(&(ob->fallback_hostlist), ob->fallback_hosts, FALSE);
452 /*************************************************
453 * Set delivery info into all active addresses *
454 *************************************************/
456 /* Only addresses whose status is >= PENDING are relevant. A lesser
457 status means that an address is not currently being processed.
460 addrlist points to a chain of addresses
461 errno_value to put in each address's errno field
462 msg to put in each address's message field
463 rc to put in each address's transport_return field
464 pass_message if TRUE, set the "pass message" flag in the address
465 host if set, mark addrs as having used this host
466 smtp_greeting from peer
467 helo_response from peer
469 If errno_value has the special value ERRNO_CONNECTTIMEOUT, ETIMEDOUT is put in
470 the errno field, and RTEF_CTOUT is ORed into the more_errno field, to indicate
471 this particular type of timeout.
477 set_errno(address_item *addrlist, int errno_value, uschar *msg, int rc,
478 BOOL pass_message, host_item * host
479 #ifdef EXPERIMENTAL_DSN_INFO
480 , const uschar * smtp_greeting, const uschar * helo_response
486 if (errno_value == ERRNO_CONNECTTIMEOUT)
488 errno_value = ETIMEDOUT;
489 orvalue = RTEF_CTOUT;
491 for (addr = addrlist; addr; addr = addr->next)
492 if (addr->transport_return >= PENDING)
494 addr->basic_errno = errno_value;
495 addr->more_errno |= orvalue;
499 if (pass_message) setflag(addr, af_pass_message);
501 addr->transport_return = rc;
504 addr->host_used = host;
505 #ifdef EXPERIMENTAL_DSN_INFO
507 {uschar * s = Ustrchr(smtp_greeting, '\n'); if (s) *s = '\0';}
508 addr->smtp_greeting = smtp_greeting;
511 {uschar * s = Ustrchr(helo_response, '\n'); if (s) *s = '\0';}
512 addr->helo_response = helo_response;
519 set_errno_nohost(address_item *addrlist, int errno_value, uschar *msg, int rc,
522 set_errno(addrlist, errno_value, msg, rc, pass_message, NULL
523 #ifdef EXPERIMENTAL_DSN_INFO
530 /*************************************************
531 * Check an SMTP response *
532 *************************************************/
534 /* This function is given an errno code and the SMTP response buffer
535 to analyse, together with the host identification for generating messages. It
536 sets an appropriate message and puts the first digit of the response code into
537 the yield variable. If no response was actually read, a suitable digit is
541 host the current host, to get its name for messages
542 errno_value pointer to the errno value
543 more_errno from the top address for use with ERRNO_FILTER_FAIL
544 buffer the SMTP response buffer
545 yield where to put a one-digit SMTP response code
546 message where to put an error message
547 pass_message set TRUE if message is an SMTP response
549 Returns: TRUE if an SMTP "QUIT" command should be sent, else FALSE
553 check_response(host_item *host, int *errno_value, int more_errno,
554 uschar *buffer, int *yield, uschar **message, BOOL *pass_message)
556 uschar * pl = pipelining_active ? US"pipelined " : US"";
559 *yield = '4'; /* Default setting is to give a temporary error */
563 case ETIMEDOUT: /* Handle response timeout */
564 *message = US string_sprintf("SMTP timeout after %s%s",
566 if (transport_count > 0)
567 *message = US string_sprintf("%s (%d bytes written)", *message,
571 case ERRNO_SMTPFORMAT: /* Handle malformed SMTP response */
572 s = string_printing(buffer);
573 while (isspace(*s)) s++;
575 ? string_sprintf("Malformed SMTP reply (an empty line) "
576 "in response to %s%s", pl, smtp_command)
577 : string_sprintf("Malformed SMTP reply in response to %s%s: %s",
578 pl, smtp_command, s);
581 case ERRNO_FILTER_FAIL: /* Handle a failed filter process error;
582 can't send QUIT as we mustn't end the DATA. */
583 *message = string_sprintf("transport filter process failed (%d)%s",
585 more_errno == EX_EXECFAILED ? ": unable to execute command" : "");
588 case ERRNO_CHHEADER_FAIL: /* Handle a failed add_headers expansion;
589 can't send QUIT as we mustn't end the DATA. */
591 string_sprintf("failed to expand headers_add or headers_remove: %s",
592 expand_string_message);
595 case ERRNO_WRITEINCOMPLETE: /* failure to write a complete data block */
596 *message = string_sprintf("failed to write a data block");
600 case ERRNO_UTF8_FWD: /* no advertised SMTPUTF8, for international message */
601 *message = US"utf8 support required but not offered for forwarding";
602 DEBUG(D_deliver|D_transport) debug_printf("%s\n", *message);
607 /* Handle error responses from the remote mailer. */
611 *message = string_sprintf("SMTP error from remote mail server after %s%s: "
612 "%s", pl, smtp_command, s = string_printing(buffer));
613 *pass_message = TRUE;
618 /* No data was read. If there is no errno, this must be the EOF (i.e.
619 connection closed) case, which causes deferral. An explicit connection reset
620 error has the same effect. Otherwise, put the host's identity in the message,
621 leaving the errno value to be interpreted as well. In all cases, we have to
622 assume the connection is now dead. */
624 if (*errno_value == 0 || *errno_value == ECONNRESET)
626 *errno_value = ERRNO_SMTPCLOSED;
627 *message = US string_sprintf("Remote host closed connection "
628 "in response to %s%s", pl, smtp_command);
631 *message = US string_sprintf("%s [%s]", host->name, host->address);
638 /*************************************************
639 * Write error message to logs *
640 *************************************************/
642 /* This writes to the main log and to the message log.
645 host the current host
646 detail the current message (addr_item->message)
647 basic_errno the errno (addr_item->basic_errno)
653 write_logs(const host_item *host, const uschar *suffix, int basic_errno)
657 uschar *message = LOGGING(outgoing_port)
658 ? string_sprintf("H=%s [%s]:%d", host->name, host->address,
659 host->port == PORT_NONE ? 25 : host->port)
660 : string_sprintf("H=%s [%s]", host->name, host->address);
664 message = string_sprintf("%s: %s", message, suffix);
666 message = string_sprintf("%s: %s", message, strerror(basic_errno));
669 message = string_sprintf("%s %s", message, exim_errstr(basic_errno));
671 log_write(0, LOG_MAIN, "%s", message);
672 deliver_msglog("%s %s\n", tod_stamp(tod_log), message);
676 msglog_line(host_item * host, uschar * message)
678 deliver_msglog("%s H=%s [%s] %s\n", tod_stamp(tod_log),
679 host->name, host->address, message);
684 #ifndef DISABLE_EVENT
685 /*************************************************
686 * Post-defer action *
687 *************************************************/
689 /* This expands an arbitrary per-transport string.
690 It might, for example, be used to write to the database log.
693 addr the address item containing error information
694 host the current host
700 deferred_event_raise(address_item *addr, host_item *host)
702 uschar * action = addr->transport->event_action;
703 const uschar * save_domain;
709 save_domain = deliver_domain;
710 save_local = deliver_localpart;
712 /*XXX would ip & port already be set up? */
713 deliver_host_address = string_copy(host->address);
714 deliver_host_port = host->port == PORT_NONE ? 25 : host->port;
715 event_defer_errno = addr->basic_errno;
717 router_name = addr->router->name;
718 transport_name = addr->transport->name;
719 deliver_domain = addr->domain;
720 deliver_localpart = addr->local_part;
722 (void) event_raise(action, US"msg:host:defer",
724 ? addr->basic_errno > 0
725 ? string_sprintf("%s: %s", addr->message, strerror(addr->basic_errno))
726 : string_copy(addr->message)
727 : addr->basic_errno > 0
728 ? string_copy(US strerror(addr->basic_errno))
731 deliver_localpart = save_local;
732 deliver_domain = save_domain;
733 router_name = transport_name = NULL;
737 /*************************************************
738 * Synchronize SMTP responses *
739 *************************************************/
741 /* This function is called from smtp_deliver() to receive SMTP responses from
742 the server, and match them up with the commands to which they relate. When
743 PIPELINING is not in use, this function is called after every command, and is
744 therefore somewhat over-engineered, but it is simpler to use a single scheme
745 that works both with and without PIPELINING instead of having two separate sets
748 The set of commands that are buffered up with pipelining may start with MAIL
749 and may end with DATA; in between are RCPT commands that correspond to the
750 addresses whose status is PENDING_DEFER. All other commands (STARTTLS, AUTH,
751 etc.) are never buffered.
753 Errors after MAIL or DATA abort the whole process leaving the response in the
754 buffer. After MAIL, pending responses are flushed, and the original command is
755 re-instated in big_buffer for error messages. For RCPT commands, the remote is
756 permitted to reject some recipient addresses while accepting others. However
757 certain errors clearly abort the whole process. Set the value in
758 transport_return to PENDING_OK if the address is accepted. If there is a
759 subsequent general error, it will get reset accordingly. If not, it will get
760 converted to OK at the end.
763 sx smtp connection context
764 count the number of responses to read
765 pending_DATA 0 if last command sent was not DATA
766 +1 if previously had a good recipient
767 -1 if not previously had a good recipient
769 Returns: 3 if at least one address had 2xx and one had 5xx
770 2 if at least one address had 5xx but none had 2xx
771 1 if at least one host had a 2xx response, but none had 5xx
772 0 no address had 2xx or 5xx but no errors (all 4xx, or just DATA)
773 -1 timeout while reading RCPT response
774 -2 I/O or other non-response error for RCPT
775 -3 DATA or MAIL failed - errno and buffer set
779 sync_responses(smtp_context * sx, int count, int pending_DATA)
781 address_item *addr = sx->sync_addr;
782 smtp_transport_options_block *ob =
783 (smtp_transport_options_block *)sx->tblock->options_block;
786 /* Handle the response for a MAIL command. On error, reinstate the original
787 command in big_buffer for error message use, and flush any further pending
788 responses before returning, except after I/O errors and timeouts. */
790 if (sx->pending_MAIL)
793 if (!smtp_read_response(&sx->inblock, sx->buffer, sizeof(sx->buffer),
794 '2', ob->command_timeout))
796 DEBUG(D_transport) debug_printf("bad response for MAIL\n");
797 Ustrcpy(big_buffer, mail_command); /* Fits, because it came from there! */
798 if (errno == 0 && sx->buffer[0] != 0)
800 uschar flushbuffer[4096];
802 if (sx->buffer[0] == '4')
804 save_errno = ERRNO_MAIL4XX;
805 addr->more_errno |= ((sx->buffer[1] - '0')*10 + sx->buffer[2] - '0') << 8;
809 if (!smtp_read_response(&sx->inblock, flushbuffer, sizeof(flushbuffer),
810 '2', ob->command_timeout)
811 && (errno != 0 || flushbuffer[0] == 0))
817 if (pending_DATA) count--; /* Number of RCPT responses to come */
818 while (count-- > 0) /* Mark any pending addrs with the host used */
820 while (addr->transport_return != PENDING_DEFER) addr = addr->next;
821 addr->host_used = sx->host;
828 if (pending_DATA) count--; /* Number of RCPT responses to come */
830 /* Read and handle the required number of RCPT responses, matching each one up
831 with an address by scanning for the next address whose status is PENDING_DEFER.
836 while (addr->transport_return != PENDING_DEFER)
837 if (!(addr = addr->next))
840 /* The address was accepted */
841 addr->host_used = sx->host;
843 if (smtp_read_response(&sx->inblock, sx->buffer, sizeof(sx->buffer),
844 '2', ob->command_timeout))
847 addr->transport_return = PENDING_OK;
849 /* If af_dr_retry_exists is set, there was a routing delay on this address;
850 ensure that any address-specific retry record is expunged. We do this both
851 for the basic key and for the version that also includes the sender. */
853 if (testflag(addr, af_dr_retry_exists))
855 uschar *altkey = string_sprintf("%s:<%s>", addr->address_retry_key,
857 retry_add_item(addr, altkey, rf_delete);
858 retry_add_item(addr, addr->address_retry_key, rf_delete);
862 /* Timeout while reading the response */
864 else if (errno == ETIMEDOUT)
866 uschar *message = string_sprintf("SMTP timeout after RCPT TO:<%s>",
867 transport_rcpt_address(addr, sx->tblock->rcpt_include_affixes));
868 set_errno_nohost(sx->first_addr, ETIMEDOUT, message, DEFER, FALSE);
869 retry_add_item(addr, addr->address_retry_key, 0);
870 update_waiting = FALSE;
874 /* Handle other errors in obtaining an SMTP response by returning -1. This
875 will cause all the addresses to be deferred. Restore the SMTP command in
876 big_buffer for which we are checking the response, so the error message
879 else if (errno != 0 || sx->buffer[0] == 0)
881 string_format(big_buffer, big_buffer_size, "RCPT TO:<%s>",
882 transport_rcpt_address(addr, sx->tblock->rcpt_include_affixes));
886 /* Handle SMTP permanent and temporary response codes. */
891 string_sprintf("SMTP error from remote mail server after RCPT TO:<%s>: "
892 "%s", transport_rcpt_address(addr, sx->tblock->rcpt_include_affixes),
893 string_printing(sx->buffer));
894 setflag(addr, af_pass_message);
896 msglog_line(sx->host, addr->message);
898 /* The response was 5xx */
900 if (sx->buffer[0] == '5')
902 addr->transport_return = FAIL;
906 /* The response was 4xx */
910 addr->transport_return = DEFER;
911 addr->basic_errno = ERRNO_RCPT4XX;
912 addr->more_errno |= ((sx->buffer[1] - '0')*10 + sx->buffer[2] - '0') << 8;
916 #ifndef DISABLE_EVENT
917 event_defer_errno = addr->more_errno;
918 msg_event_raise(US"msg:rcpt:host:defer", addr);
921 /* Log temporary errors if there are more hosts to be tried.
922 If not, log this last one in the == line. */
925 log_write(0, LOG_MAIN, "H=%s [%s]: %s",
926 sx->host->name, sx->host->address, addr->message);
928 #ifndef DISABLE_EVENT
930 msg_event_raise(US"msg:rcpt:defer", addr);
933 /* Do not put this message on the list of those waiting for specific
934 hosts, as otherwise it is likely to be tried too often. */
936 update_waiting = FALSE;
938 /* Add a retry item for the address so that it doesn't get tried again
939 too soon. If address_retry_include_sender is true, add the sender address
943 ob->address_retry_include_sender
944 ? string_sprintf("%s:<%s>", addr->address_retry_key, sender_address)
945 : addr->address_retry_key,
950 } /* Loop for next RCPT response */
952 /* Update where to start at for the next block of responses, unless we
953 have already handled all the addresses. */
955 if (addr) sx->sync_addr = addr->next;
957 /* Handle a response to DATA. If we have not had any good recipients, either
958 previously or in this block, the response is ignored. */
960 if (pending_DATA != 0 &&
961 !smtp_read_response(&sx->inblock, sx->buffer, sizeof(sx->buffer),
962 '3', ob->command_timeout))
967 if (pending_DATA > 0 || (yield & 1) != 0)
969 if (errno == 0 && sx->buffer[0] == '4')
971 errno = ERRNO_DATA4XX;
972 sx->first_addr->more_errno |= ((sx->buffer[1] - '0')*10 + sx->buffer[2] - '0') << 8;
976 (void)check_response(sx->host, &errno, 0, sx->buffer, &code, &msg, &pass_message);
977 DEBUG(D_transport) debug_printf("%s\nerror for DATA ignored: pipelining "
978 "is in use and there were no good recipients\n", msg);
981 /* All responses read and handled; MAIL (if present) received 2xx and DATA (if
982 present) received 3xx. If any RCPTs were handled and yielded anything other
983 than 4xx, yield will be set non-zero. */
990 /* Do the client side of smtp-level authentication */
993 buffer EHLO response from server (gets overwritten)
994 addrlist chain of potential addresses to deliver
995 host host to deliver to
997 ibp, obp comms channel control blocks
1000 OK Success, or failed (but not required): global "smtp_authenticated" set
1001 DEFER Failed authentication (and was required)
1002 ERROR Internal problem
1004 FAIL_SEND Failed communications - transmit
1009 smtp_auth(uschar *buffer, unsigned bufsize, address_item *addrlist, host_item *host,
1010 smtp_transport_options_block *ob, BOOL is_esmtp,
1011 smtp_inblock *ibp, smtp_outblock *obp)
1014 uschar *fail_reason = US"server did not advertise AUTH support";
1016 smtp_authenticated = FALSE;
1017 client_authenticator = client_authenticated_id = client_authenticated_sender = NULL;
1018 require_auth = verify_check_given_host(&ob->hosts_require_auth, host);
1020 if (is_esmtp && !regex_AUTH) regex_AUTH =
1021 regex_must_compile(US"\\n250[\\s\\-]AUTH\\s+([\\-\\w\\s]+)(?:\\n|$)",
1024 if (is_esmtp && regex_match_and_setup(regex_AUTH, buffer, 0, -1))
1026 uschar *names = string_copyn(expand_nstring[1], expand_nlength[1]);
1027 expand_nmax = -1; /* reset */
1029 /* Must not do this check until after we have saved the result of the
1030 regex match above. */
1032 if (require_auth == OK ||
1033 verify_check_given_host(&ob->hosts_try_auth, host) == OK)
1036 fail_reason = US"no common mechanisms were found";
1038 DEBUG(D_transport) debug_printf("scanning authentication mechanisms\n");
1040 /* Scan the configured authenticators looking for one which is configured
1041 for use as a client, which is not suppressed by client_condition, and
1042 whose name matches an authentication mechanism supported by the server.
1043 If one is found, attempt to authenticate by calling its client function.
1046 for (au = auths; !smtp_authenticated && au; au = au->next)
1050 (au->client_condition != NULL &&
1051 !expand_check_condition(au->client_condition, au->name,
1052 US"client authenticator")))
1054 DEBUG(D_transport) debug_printf("skipping %s authenticator: %s\n",
1056 (au->client)? "client_condition is false" :
1057 "not configured as a client");
1061 /* Loop to scan supported server mechanisms */
1066 int len = Ustrlen(au->public_name);
1067 while (isspace(*p)) p++;
1069 if (strncmpic(au->public_name, p, len) != 0 ||
1070 (p[len] != 0 && !isspace(p[len])))
1072 while (*p != 0 && !isspace(*p)) p++;
1076 /* Found data for a listed mechanism. Call its client entry. Set
1077 a flag in the outblock so that data is overwritten after sending so
1078 that reflections don't show it. */
1080 fail_reason = US"authentication attempt(s) failed";
1081 obp->authenticating = TRUE;
1082 rc = (au->info->clientcode)(au, ibp, obp,
1083 ob->command_timeout, buffer, bufsize);
1084 obp->authenticating = FALSE;
1085 DEBUG(D_transport) debug_printf("%s authenticator yielded %d\n",
1088 /* A temporary authentication failure must hold up delivery to
1089 this host. After a permanent authentication failure, we carry on
1090 to try other authentication methods. If all fail hard, try to
1091 deliver the message unauthenticated unless require_auth was set. */
1096 smtp_authenticated = TRUE; /* stops the outer loop */
1097 client_authenticator = au->name;
1098 if (au->set_client_id != NULL)
1099 client_authenticated_id = expand_string(au->set_client_id);
1102 /* Failure after writing a command */
1107 /* Failure after reading a response */
1110 if (errno != 0 || buffer[0] != '5') return FAIL;
1111 log_write(0, LOG_MAIN, "%s authenticator failed H=%s [%s] %s",
1112 au->name, host->name, host->address, buffer);
1115 /* Failure by some other means. In effect, the authenticator
1116 decided it wasn't prepared to handle this case. Typically this
1117 is the result of "fail" in an expansion string. Do we need to
1118 log anything here? Feb 2006: a message is now put in the buffer
1119 if logging is required. */
1123 log_write(0, LOG_MAIN, "%s authenticator cancelled "
1124 "authentication H=%s [%s] %s", au->name, host->name,
1125 host->address, buffer);
1128 /* Internal problem, message in buffer. */
1131 set_errno_nohost(addrlist, ERRNO_AUTHPROB, string_copy(buffer),
1136 break; /* If not authenticated, try next authenticator */
1137 } /* Loop for scanning supported server mechanisms */
1138 } /* Loop for further authenticators */
1142 /* If we haven't authenticated, but are required to, give up. */
1144 if (require_auth == OK && !smtp_authenticated)
1146 set_errno_nohost(addrlist, ERRNO_AUTHFAIL,
1147 string_sprintf("authentication required but %s", fail_reason), DEFER,
1156 /* Construct AUTH appendix string for MAIL TO */
1159 buffer to build string
1160 addrlist chain of potential addresses to deliver
1161 ob transport options
1163 Globals smtp_authenticated
1164 client_authenticated_sender
1165 Return True on error, otherwise buffer has (possibly empty) terminated string
1169 smtp_mail_auth_str(uschar *buffer, unsigned bufsize, address_item *addrlist,
1170 smtp_transport_options_block *ob)
1172 uschar *local_authenticated_sender = authenticated_sender;
1175 debug_printf("smtp_mail_auth_str: as<%s> os<%s> SA<%s>\n", authenticated_sender, ob->authenticated_sender, smtp_authenticated?"Y":"N");
1178 if (ob->authenticated_sender != NULL)
1180 uschar *new = expand_string(ob->authenticated_sender);
1183 if (!expand_string_forcedfail)
1185 uschar *message = string_sprintf("failed to expand "
1186 "authenticated_sender: %s", expand_string_message);
1187 set_errno_nohost(addrlist, ERRNO_EXPANDFAIL, message, DEFER, FALSE);
1191 else if (new[0] != 0) local_authenticated_sender = new;
1194 /* Add the authenticated sender address if present */
1196 if ((smtp_authenticated || ob->authenticated_sender_force) &&
1197 local_authenticated_sender != NULL)
1199 string_format(buffer, bufsize, " AUTH=%s",
1200 auth_xtextencode(local_authenticated_sender,
1201 Ustrlen(local_authenticated_sender)));
1202 client_authenticated_sender = string_copy(local_authenticated_sender);
1213 /* Lookup TLSA record for host/port.
1214 Return: OK success with dnssec; DANE mode
1215 DEFER Do not use this host now, may retry later
1216 FAIL_FORCED No TLSA record; DANE not usable
1217 FAIL Do not use this connection
1221 tlsa_lookup(const host_item * host, dns_answer * dnsa, BOOL dane_required)
1223 /* move this out to host.c given the similarity to dns_lookup() ? */
1225 const uschar * fullname = buffer;
1229 /* TLSA lookup string */
1230 (void)sprintf(CS buffer, "_%d._tcp.%.256s", host->port, host->name);
1232 rc = dns_lookup(dnsa, buffer, T_TLSA, &fullname);
1233 sec = dns_is_secure(dnsa);
1235 debug_printf("TLSA lookup ret %d %sDNSSEC\n", rc, sec ? "" : "not ");
1240 return DEFER; /* just defer this TLS'd conn */
1244 log_write(0, LOG_MAIN,
1245 "DANE error: TLSA lookup for %s not DNSSEC", host->name);
1248 case DNS_NODATA: /* no TLSA RR for this lookup */
1249 case DNS_NOMATCH: /* no records at all for this lookup */
1250 return dane_required ? FAIL : FAIL_FORCED;
1254 return dane_required ? FAIL : DEFER;
1261 typedef struct smtp_compare_s
1263 uschar *current_sender_address;
1264 struct transport_instance *tblock;
1268 /* Create a unique string that identifies this message, it is based on
1269 sender_address, helo_data and tls_certificate if enabled.
1273 smtp_local_identity(uschar * sender, struct transport_instance * tblock)
1275 address_item * addr1;
1276 uschar * if1 = US"";
1277 uschar * helo1 = US"";
1279 uschar * tlsc1 = US"";
1281 uschar * save_sender_address = sender_address;
1282 uschar * local_identity = NULL;
1283 smtp_transport_options_block * ob =
1284 (smtp_transport_options_block *)tblock->options_block;
1286 sender_address = sender;
1288 addr1 = deliver_make_addr (sender, TRUE);
1289 deliver_set_expansions(addr1);
1292 if1 = expand_string(ob->interface);
1295 helo1 = expand_string(ob->helo_data);
1298 if (ob->tls_certificate)
1299 tlsc1 = expand_string(ob->tls_certificate);
1300 local_identity = string_sprintf ("%s^%s^%s", if1, helo1, tlsc1);
1302 local_identity = string_sprintf ("%s^%s", if1, helo1);
1305 deliver_set_expansions(NULL);
1306 sender_address = save_sender_address;
1308 return local_identity;
1313 /* This routine is a callback that is called from transport_check_waiting.
1314 This function will evaluate the incoming message versus the previous
1315 message. If the incoming message is using a different local identity then
1316 we will veto this new message. */
1319 smtp_are_same_identities(uschar * message_id, smtp_compare_t * s_compare)
1321 uschar * message_local_identity,
1322 * current_local_identity,
1323 * new_sender_address;
1325 current_local_identity =
1326 smtp_local_identity(s_compare->current_sender_address, s_compare->tblock);
1328 if (!(new_sender_address = deliver_get_sender_address(message_id)))
1331 message_local_identity =
1332 smtp_local_identity(new_sender_address, s_compare->tblock);
1334 return Ustrcmp(current_local_identity, message_local_identity) == 0;
1340 ehlo_response(uschar * buf, uschar checks)
1342 size_t bsize = Ustrlen(buf);
1345 if ( checks & OPTION_TLS
1346 && pcre_exec(regex_STARTTLS, NULL, CS buf, bsize, 0, PCRE_EOPT, NULL, 0) < 0)
1347 checks &= ~OPTION_TLS;
1350 if ( checks & OPTION_IGNQ
1351 && pcre_exec(regex_IGNOREQUOTA, NULL, CS buf, bsize, 0,
1352 PCRE_EOPT, NULL, 0) < 0)
1353 checks &= ~OPTION_IGNQ;
1355 if ( checks & OPTION_CHUNKING
1356 && pcre_exec(regex_CHUNKING, NULL, CS buf, bsize, 0, PCRE_EOPT, NULL, 0) < 0)
1357 checks &= ~OPTION_CHUNKING;
1359 #ifndef DISABLE_PRDR
1360 if ( checks & OPTION_PRDR
1361 && pcre_exec(regex_PRDR, NULL, CS buf, bsize, 0, PCRE_EOPT, NULL, 0) < 0)
1362 checks &= ~OPTION_PRDR;
1366 if ( checks & OPTION_UTF8
1367 && pcre_exec(regex_UTF8, NULL, CS buf, bsize, 0, PCRE_EOPT, NULL, 0) < 0)
1368 checks &= ~OPTION_UTF8;
1371 if ( checks & OPTION_DSN
1372 && pcre_exec(regex_DSN, NULL, CS buf, bsize, 0, PCRE_EOPT, NULL, 0) < 0)
1373 checks &= ~OPTION_DSN;
1375 if ( checks & OPTION_PIPE
1376 && pcre_exec(regex_PIPELINING, NULL, CS buf, bsize, 0,
1377 PCRE_EOPT, NULL, 0) < 0)
1378 checks &= ~OPTION_PIPE;
1380 if ( checks & OPTION_SIZE
1381 && pcre_exec(regex_SIZE, NULL, CS buf, bsize, 0, PCRE_EOPT, NULL, 0) < 0)
1382 checks &= ~OPTION_SIZE;
1389 /* Callback for emitting a BDAT data chunk header.
1391 If given a nonzero size, first flush any buffered SMTP commands
1392 then emit the command.
1394 Reap previous SMTP command responses if requested, and always reap
1395 the response from a previous BDAT command.
1398 tctx transport context
1399 chunk_size value for SMTP BDAT command
1401 tc_chunk_last add LAST option to SMTP BDAT command
1402 tc_reap_prev reap response to previous SMTP commands
1404 Returns: OK or ERROR
1408 smtp_chunk_cmd_callback(transport_ctx * tctx, unsigned chunk_size,
1411 smtp_transport_options_block * ob =
1412 (smtp_transport_options_block *)(tctx->tblock->options_block);
1413 smtp_context * sx = tctx->smtp_context;
1417 /* Write SMTP chunk header command. If not reaping responses, note that
1418 there may be more writes (like, the chunk data) done soon. */
1422 if((cmd_count = smtp_write_command(&sx->outblock,
1423 flags & tc_reap_prev ? SCMD_FLUSH : SCMD_MORE,
1424 "BDAT %u%s\r\n", chunk_size, flags & tc_chunk_last ? " LAST" : "")
1425 ) < 0) return ERROR;
1426 if (flags & tc_chunk_last)
1427 data_command = string_copy(big_buffer); /* Save for later error message */
1430 prev_cmd_count = cmd_count += sx->cmd_count;
1432 /* Reap responses for any previous, but not one we just emitted */
1436 if (sx->pending_BDAT)
1439 if (flags & tc_reap_prev && prev_cmd_count > 0)
1441 DEBUG(D_transport) debug_printf("look for %d responses"
1442 " for previous pipelined cmds\n", prev_cmd_count);
1444 switch(sync_responses(sx, prev_cmd_count, 0))
1446 case 1: /* 2xx (only) => OK */
1447 case 3: sx->good_RCPT = TRUE; /* 2xx & 5xx => OK & progress made */
1448 case 2: sx->completed_addr = TRUE; /* 5xx (only) => progress made */
1449 case 0: break; /* No 2xx or 5xx, but no probs */
1451 case -1: /* Timeout on RCPT */
1452 default: return ERROR; /* I/O error, or any MAIL/DATA error */
1455 if (!sx->pending_BDAT)
1456 pipelining_active = FALSE;
1459 /* Reap response for an outstanding BDAT */
1461 if (sx->pending_BDAT)
1463 DEBUG(D_transport) debug_printf("look for one response for BDAT\n");
1465 if (!smtp_read_response(&sx->inblock, sx->buffer, sizeof(sx->buffer), '2',
1466 ob->command_timeout))
1468 if (errno == 0 && sx->buffer[0] == '4')
1470 errno = ERRNO_DATA4XX; /*XXX does this actually get used? */
1471 sx->addrlist->more_errno |=
1472 ((sx->buffer[1] - '0')*10 + sx->buffer[2] - '0') << 8;
1477 sx->pending_BDAT = FALSE;
1478 pipelining_active = FALSE;
1480 else if (chunk_size > 0)
1481 sx->pending_BDAT = TRUE;
1484 sx->cmd_count = cmd_count;
1490 /*************************************************
1491 * Make connection for given message *
1492 *************************************************/
1496 ctx connection context
1497 suppress_tls if TRUE, don't attempt a TLS connection - this is set for
1498 a second attempt after TLS initialization fails
1500 Returns: OK - the connection was made and the delivery attempted;
1501 fd is set in the conn context, tls_out set up.
1502 DEFER - the connection could not be made, or something failed
1503 while setting up the SMTP session, or there was a
1504 non-message-specific error, such as a timeout.
1505 ERROR - helo_data or add_headers or authenticated_sender is
1506 specified for this transport, and the string failed
1510 smtp_setup_conn(smtp_context * sx, BOOL suppress_tls)
1512 #if defined(SUPPORT_TLS) && defined(SUPPORT_DANE)
1513 dns_answer tlsa_dnsa;
1515 BOOL pass_message = FALSE;
1516 uschar * message = NULL;
1520 sx->ob = (smtp_transport_options_block *) sx->tblock->options_block;
1522 sx->lmtp = strcmpic(sx->ob->protocol, US"lmtp") == 0;
1523 sx->smtps = strcmpic(sx->ob->protocol, US"smtps") == 0;
1525 sx->send_rset = TRUE;
1526 sx->send_quit = TRUE;
1527 sx->setting_up = TRUE;
1529 sx->esmtp_sent = FALSE;
1531 sx->utf8_needed = FALSE;
1533 sx->dsn_all_lasthop = TRUE;
1534 #if defined(SUPPORT_TLS) && defined(SUPPORT_DANE)
1536 sx->dane_required = verify_check_given_host(&sx->ob->hosts_require_dane, sx->host) == OK;
1539 if ((sx->max_rcpt = sx->tblock->max_addresses) == 0) sx->max_rcpt = 999999;
1540 sx->peer_offered = 0;
1541 sx->avoid_option = 0;
1542 sx->igquotstr = US"";
1543 if (!sx->helo_data) sx->helo_data = sx->ob->helo_data;
1544 #ifdef EXPERIMENTAL_DSN_INFO
1545 sx->smtp_greeting = NULL;
1546 sx->helo_response = NULL;
1549 smtp_command = US"initial connection";
1550 sx->buffer[0] = '\0';
1552 /* Set up the buffer for reading SMTP response packets. */
1554 sx->inblock.buffer = sx->inbuffer;
1555 sx->inblock.buffersize = sizeof(sx->inbuffer);
1556 sx->inblock.ptr = sx->inbuffer;
1557 sx->inblock.ptrend = sx->inbuffer;
1559 /* Set up the buffer for holding SMTP commands while pipelining */
1561 sx->outblock.buffer = sx->outbuffer;
1562 sx->outblock.buffersize = sizeof(sx->outbuffer);
1563 sx->outblock.ptr = sx->outbuffer;
1564 sx->outblock.cmd_count = 0;
1565 sx->outblock.authenticating = FALSE;
1567 /* Reset the parameters of a TLS session. */
1570 tls_out.cipher = NULL; /* the one we may use for this transport */
1571 tls_out.ourcert = NULL;
1572 tls_out.peercert = NULL;
1573 tls_out.peerdn = NULL;
1574 #if defined(SUPPORT_TLS) && !defined(USE_GNUTLS)
1577 tls_out.ocsp = OCSP_NOT_REQ;
1579 /* Flip the legacy TLS-related variables over to the outbound set in case
1580 they're used in the context of the transport. Don't bother resetting
1581 afterward (when being used by a transport) as we're in a subprocess.
1582 For verify, unflipped once the callout is dealt with */
1584 tls_modify_variables(&tls_out);
1589 set_errno_nohost(sx->addrlist, ERRNO_TLSFAILURE, US"TLS support not available",
1595 /* Make a connection to the host if this isn't a continued delivery, and handle
1596 the initial interaction and HELO/EHLO/LHLO. Connect timeout errors are handled
1597 specially so they can be identified for retries. */
1599 if (!continue_hostname)
1602 HDEBUG(D_verify) debug_printf("interface=%s port=%d\n", sx->interface, sx->port);
1604 /* Get the actual port the connection will use, into sx->host */
1606 smtp_port_for_connect(sx->host, sx->port);
1608 #if defined(SUPPORT_TLS) && defined(SUPPORT_DANE)
1609 /* Do TLSA lookup for DANE */
1611 tls_out.dane_verified = FALSE;
1612 tls_out.tlsa_usage = 0;
1614 if (sx->host->dnssec == DS_YES)
1616 if( sx->dane_required
1617 || verify_check_given_host(&sx->ob->hosts_try_dane, sx->host) == OK
1619 switch (rc = tlsa_lookup(sx->host, &tlsa_dnsa, sx->dane_required))
1621 case OK: sx->dane = TRUE;
1622 sx->ob->tls_tempfail_tryclear = FALSE;
1624 case FAIL_FORCED: break;
1625 default: set_errno_nohost(sx->addrlist, ERRNO_DNSDEFER,
1626 string_sprintf("DANE error: tlsa lookup %s",
1627 rc == DEFER ? "DEFER" : "FAIL"),
1629 (void) event_raise(sx->tblock->event_action,
1630 US"dane:fail", sx->dane_required
1631 ? US"dane-required" : US"dnssec-invalid");
1635 else if (sx->dane_required)
1637 set_errno_nohost(sx->addrlist, ERRNO_DNSDEFER,
1638 string_sprintf("DANE error: %s lookup not DNSSEC", sx->host->name),
1640 (void) event_raise(sx->tblock->event_action,
1641 US"dane:fail", US"dane-required");
1647 /* Make the TCP connection */
1650 smtp_connect(sx->host, sx->host_af, sx->interface,
1651 sx->ob->connect_timeout, sx->tblock);
1652 sx->cctx.tls_ctx = NULL;
1653 sx->inblock.cctx = sx->outblock.cctx = &sx->cctx;
1655 if (sx->cctx.sock < 0)
1657 uschar * msg = NULL;
1660 msg = US strerror(errno);
1661 HDEBUG(D_verify) debug_printf("connect: %s\n", msg);
1663 set_errno_nohost(sx->addrlist,
1664 errno == ETIMEDOUT ? ERRNO_CONNECTTIMEOUT : errno,
1665 sx->verify ? string_sprintf("could not connect: %s", msg)
1668 sx->send_quit = FALSE;
1672 /* Expand the greeting message while waiting for the initial response. (Makes
1673 sense if helo_data contains ${lookup dnsdb ...} stuff). The expansion is
1674 delayed till here so that $sending_interface and $sending_port are set. */
1677 if (!(sx->helo_data = expand_string(sx->helo_data)))
1679 log_write(0, LOG_MAIN|LOG_PANIC,
1680 "<%s>: failed to expand transport's helo_data value for callout: %s",
1681 sx->addrlist->address, expand_string_message);
1686 expand_string_message = NULL;
1687 if ((sx->helo_data = string_domain_utf8_to_alabel(sx->helo_data,
1688 &expand_string_message)),
1689 expand_string_message)
1691 log_write(0, LOG_MAIN|LOG_PANIC,
1692 "<%s>: failed to expand transport's helo_data value for callout: %s",
1693 sx->addrlist->address, expand_string_message);
1695 sx->helo_data = NULL;
1699 /* The first thing is to wait for an initial OK response. The dreaded "goto"
1700 is nevertheless a reasonably clean way of programming this kind of logic,
1701 where you want to escape on any error. */
1708 (void) setsockopt(sx->cctx.sock, IPPROTO_TCP, TCP_QUICKACK, US &off, sizeof(off));
1710 good_response = smtp_read_response(&sx->inblock, sx->buffer, sizeof(sx->buffer),
1711 '2', sx->ob->command_timeout);
1712 #ifdef EXPERIMENTAL_DSN_INFO
1713 sx->smtp_greeting = string_copy(sx->buffer);
1715 if (!good_response) goto RESPONSE_FAILED;
1717 #ifndef DISABLE_EVENT
1720 lookup_dnssec_authenticated = sx->host->dnssec==DS_YES ? US"yes"
1721 : sx->host->dnssec==DS_NO ? US"no" : NULL;
1722 s = event_raise(sx->tblock->event_action, US"smtp:connect", sx->buffer);
1725 set_errno_nohost(sx->addrlist, ERRNO_EXPANDFAIL,
1726 string_sprintf("deferred by smtp:connect event expansion: %s", s),
1734 /* Now check if the helo_data expansion went well, and sign off cleanly if
1739 message = string_sprintf("failed to expand helo_data: %s",
1740 expand_string_message);
1741 set_errno_nohost(sx->addrlist, ERRNO_EXPANDFAIL, message, DEFER, FALSE);
1747 /** Debugging without sending a message
1748 sx->addrlist->transport_return = DEFER;
1752 /* Errors that occur after this point follow an SMTP command, which is
1753 left in big_buffer by smtp_write_command() for use in error messages. */
1755 smtp_command = big_buffer;
1757 /* Tell the remote who we are...
1759 February 1998: A convention has evolved that ESMTP-speaking MTAs include the
1760 string "ESMTP" in their greeting lines, so make Exim send EHLO if the
1761 greeting is of this form. The assumption was that the far end supports it
1762 properly... but experience shows that there are some that give 5xx responses,
1763 even though the banner includes "ESMTP" (there's a bloody-minded one that
1764 says "ESMTP not spoken here"). Cope with that case.
1766 September 2000: Time has passed, and it seems reasonable now to always send
1767 EHLO at the start. It is also convenient to make the change while installing
1770 July 2003: Joachim Wieland met a broken server that advertises "PIPELINING"
1771 but times out after sending MAIL FROM, RCPT TO and DATA all together. There
1772 would be no way to send out the mails, so there is now a host list
1773 "hosts_avoid_esmtp" that disables ESMTP for special hosts and solves the
1774 PIPELINING problem as well. Maybe it can also be useful to cure other
1775 problems with broken servers.
1777 Exim originally sent "Helo" at this point and ran for nearly a year that way.
1778 Then somebody tried it with a Microsoft mailer... It seems that all other
1779 mailers use upper case for some reason (the RFC is quite clear about case
1780 independence) so, for peace of mind, I gave in. */
1782 sx->esmtp = verify_check_given_host(&sx->ob->hosts_avoid_esmtp, sx->host) != OK;
1784 /* Alas; be careful, since this goto is not an error-out, so conceivably
1785 we might set data between here and the target which we assume to exist
1786 and be usable. I can see this coming back to bite us. */
1790 smtp_peer_options |= OPTION_TLS;
1791 suppress_tls = FALSE;
1792 sx->ob->tls_tempfail_tryclear = FALSE;
1793 smtp_command = US"SSL-on-connect";
1800 if (smtp_write_command(&sx->outblock, SCMD_FLUSH, "%s %s\r\n",
1801 sx->lmtp ? "LHLO" : "EHLO", sx->helo_data) < 0)
1803 sx->esmtp_sent = TRUE;
1804 if (!smtp_read_response(&sx->inblock, sx->buffer, sizeof(sx->buffer), '2',
1805 sx->ob->command_timeout))
1807 if (errno != 0 || sx->buffer[0] == 0 || sx->lmtp)
1809 #ifdef EXPERIMENTAL_DSN_INFO
1810 sx->helo_response = string_copy(sx->buffer);
1812 goto RESPONSE_FAILED;
1816 #ifdef EXPERIMENTAL_DSN_INFO
1817 sx->helo_response = string_copy(sx->buffer);
1822 debug_printf("not sending EHLO (host matches hosts_avoid_esmtp)\n");
1827 int n = sizeof(sx->buffer);
1828 uschar * rsp = sx->buffer;
1830 if (sx->esmtp_sent && (n = Ustrlen(sx->buffer)) < sizeof(sx->buffer)/2)
1831 { rsp = sx->buffer + n + 1; n = sizeof(sx->buffer) - n; }
1833 if (smtp_write_command(&sx->outblock, SCMD_FLUSH, "HELO %s\r\n", sx->helo_data) < 0)
1835 good_response = smtp_read_response(&sx->inblock, rsp, n,
1836 '2', sx->ob->command_timeout);
1837 #ifdef EXPERIMENTAL_DSN_INFO
1838 sx->helo_response = string_copy(rsp);
1842 /* Handle special logging for a closed connection after HELO
1843 when had previously sent EHLO */
1845 if (rsp != sx->buffer && rsp[0] == 0 && (errno == 0 || errno == ECONNRESET))
1847 errno = ERRNO_SMTPCLOSED;
1848 goto EHLOHELO_FAILED;
1850 memmove(sx->buffer, rsp, Ustrlen(rsp));
1851 goto RESPONSE_FAILED;
1855 sx->avoid_option = sx->peer_offered = smtp_peer_options = 0;
1857 if (sx->esmtp || sx->lmtp)
1859 sx->peer_offered = ehlo_response(sx->buffer,
1860 OPTION_TLS /* others checked later */
1863 /* Set tls_offered if the response to EHLO specifies support for STARTTLS. */
1866 smtp_peer_options |= sx->peer_offered & OPTION_TLS;
1871 /* For continuing deliveries down the same channel, having re-exec'd the socket
1872 is the standard input; for a socket held open from verify it is recorded
1873 in the cutthrough context block. Either way we don't need to redo EHLO here
1874 (but may need to do so for TLS - see below).
1875 Set up the pointer to where subsequent commands will be left, for
1876 error messages. Note that smtp_peer_options will have been
1877 set from the command line if they were set in the process that passed the
1880 /*XXX continue case needs to propagate DSN_INFO, prob. in deliver.c
1881 as the continue goes via transport_pass_socket() and doublefork and exec.
1882 It does not wait. Unclear how we keep separate host's responses
1883 separate - we could match up by host ip+port as a bodge. */
1887 if (cutthrough.cctx.sock >= 0 && cutthrough.callout_hold_only)
1889 sx->cctx = cutthrough.cctx;
1890 sx->host->port = sx->port = cutthrough.host.port;
1894 sx->cctx.sock = 0; /* stdin */
1895 sx->cctx.tls_ctx = NULL;
1896 smtp_port_for_connect(sx->host, sx->port); /* Record the port that was used */
1898 sx->inblock.cctx = sx->outblock.cctx = &sx->cctx;
1899 smtp_command = big_buffer;
1900 sx->helo_data = NULL; /* ensure we re-expand ob->helo_data */
1902 /* For a continued connection with TLS being proxied for us, or a
1903 held-open verify connection with TLS, nothing more to do. */
1905 if ( continue_proxy_cipher
1906 || (cutthrough.cctx.sock >= 0 && cutthrough.callout_hold_only
1907 && cutthrough.is_tls)
1910 sx->peer_offered = smtp_peer_options;
1911 pipelining_active = !!(smtp_peer_options & OPTION_PIPE);
1912 HDEBUG(D_transport) debug_printf("continued connection, %s TLS\n",
1913 continue_proxy_cipher ? "proxied" : "verify conn with");
1916 HDEBUG(D_transport) debug_printf("continued connection, no TLS\n");
1919 /* If TLS is available on this connection, whether continued or not, attempt to
1920 start up a TLS session, unless the host is in hosts_avoid_tls. If successful,
1921 send another EHLO - the server may give a different answer in secure mode. We
1922 use a separate buffer for reading the response to STARTTLS so that if it is
1923 negative, the original EHLO data is available for subsequent analysis, should
1924 the client not be required to use TLS. If the response is bad, copy the buffer
1925 for error analysis. */
1928 if ( smtp_peer_options & OPTION_TLS
1930 && verify_check_given_host(&sx->ob->hosts_avoid_tls, sx->host) != OK
1932 || verify_check_given_host(&sx->ob->hosts_verify_avoid_tls, sx->host) != OK
1935 uschar buffer2[4096];
1936 if (smtp_write_command(&sx->outblock, SCMD_FLUSH, "STARTTLS\r\n") < 0)
1939 /* If there is an I/O error, transmission of this message is deferred. If
1940 there is a temporary rejection of STARRTLS and tls_tempfail_tryclear is
1941 false, we also defer. However, if there is a temporary rejection of STARTTLS
1942 and tls_tempfail_tryclear is true, or if there is an outright rejection of
1943 STARTTLS, we carry on. This means we will try to send the message in clear,
1944 unless the host is in hosts_require_tls (tested below). */
1946 if (!smtp_read_response(&sx->inblock, buffer2, sizeof(buffer2), '2',
1947 sx->ob->command_timeout))
1951 || (buffer2[0] == '4' && !sx->ob->tls_tempfail_tryclear)
1954 Ustrncpy(sx->buffer, buffer2, sizeof(sx->buffer));
1955 sx->buffer[sizeof(sx->buffer)-1] = '\0';
1956 goto RESPONSE_FAILED;
1960 /* STARTTLS accepted: try to negotiate a TLS session. */
1965 address_item * addr;
1967 sx->cctx.tls_ctx = tls_client_start(sx->cctx.sock, sx->host,
1968 sx->addrlist, sx->tblock,
1969 # ifdef SUPPORT_DANE
1970 sx->dane ? &tlsa_dnsa : NULL,
1974 if (!sx->cctx.tls_ctx)
1976 /* TLS negotiation failed; give an error. From outside, this function may
1977 be called again to try in clear on a new connection, if the options permit
1978 it for this host. */
1980 # ifdef SUPPORT_DANE
1983 log_write(0, LOG_MAIN,
1984 "DANE attempt failed; TLS connection to %s [%s]: %s",
1985 sx->host->name, sx->host->address, errstr);
1986 (void) event_raise(sx->tblock->event_action,
1987 US"dane:fail", US"validation-failure"); /* could do with better detail */
1991 errno = ERRNO_TLSFAILURE;
1992 message = string_sprintf("TLS session: %s", errstr);
1993 sx->send_quit = FALSE;
1997 /* TLS session is set up */
1999 smtp_peer_options_wrap = smtp_peer_options;
2000 for (addr = sx->addrlist; addr; addr = addr->next)
2001 if (addr->transport_return == PENDING_DEFER)
2003 addr->cipher = tls_out.cipher;
2004 addr->ourcert = tls_out.ourcert;
2005 addr->peercert = tls_out.peercert;
2006 addr->peerdn = tls_out.peerdn;
2007 addr->ocsp = tls_out.ocsp;
2012 /* if smtps, we'll have smtp_command set to something else; always safe to
2014 smtp_command = big_buffer;
2016 /* If we started TLS, redo the EHLO/LHLO exchange over the secure channel. If
2017 helo_data is null, we are dealing with a connection that was passed from
2018 another process, and so we won't have expanded helo_data above. We have to
2019 expand it here. $sending_ip_address and $sending_port are set up right at the
2020 start of the Exim process (in exim.c). */
2022 if (tls_out.active.sock >= 0)
2027 if (!sx->helo_data && !(sx->helo_data = expand_string(sx->ob->helo_data)))
2029 uschar *message = string_sprintf("failed to expand helo_data: %s",
2030 expand_string_message);
2031 set_errno_nohost(sx->addrlist, ERRNO_EXPANDFAIL, message, DEFER, FALSE);
2036 /* For SMTPS we need to wait for the initial OK response. */
2039 good_response = smtp_read_response(&sx->inblock, sx->buffer, sizeof(sx->buffer),
2040 '2', sx->ob->command_timeout);
2041 #ifdef EXPERIMENTAL_DSN_INFO
2042 sx->smtp_greeting = string_copy(sx->buffer);
2044 if (!good_response) goto RESPONSE_FAILED;
2048 greeting_cmd = "EHLO";
2051 greeting_cmd = "HELO";
2053 debug_printf("not sending EHLO (host matches hosts_avoid_esmtp)\n");
2056 if (smtp_write_command(&sx->outblock, SCMD_FLUSH, "%s %s\r\n",
2057 sx->lmtp ? "LHLO" : greeting_cmd, sx->helo_data) < 0)
2059 good_response = smtp_read_response(&sx->inblock, sx->buffer, sizeof(sx->buffer),
2060 '2', sx->ob->command_timeout);
2061 #ifdef EXPERIMENTAL_DSN_INFO
2062 sx->helo_response = string_copy(sx->buffer);
2064 if (!good_response) goto RESPONSE_FAILED;
2065 smtp_peer_options = 0;
2068 /* If the host is required to use a secure channel, ensure that we
2072 # ifdef SUPPORT_DANE
2075 || verify_check_given_host(&sx->ob->hosts_require_tls, sx->host) == OK
2078 errno = ERRNO_TLSREQUIRED;
2079 message = string_sprintf("a TLS session is required, but %s",
2080 smtp_peer_options & OPTION_TLS
2081 ? "an attempt to start TLS failed" : "the server did not offer TLS support");
2082 # ifdef SUPPORT_DANE
2084 (void) event_raise(sx->tblock->event_action, US"dane:fail",
2085 smtp_peer_options & OPTION_TLS
2086 ? US"validation-failure" /* could do with better detail */
2087 : US"starttls-not-supported");
2091 #endif /*SUPPORT_TLS*/
2093 /* If TLS is active, we have just started it up and re-done the EHLO command,
2094 so its response needs to be analyzed. If TLS is not active and this is a
2095 continued session down a previously-used socket, we haven't just done EHLO, so
2098 if (continue_hostname == NULL
2100 || tls_out.active.sock >= 0
2104 if (sx->esmtp || sx->lmtp)
2106 sx->peer_offered = ehlo_response(sx->buffer,
2108 | (sx->lmtp && sx->ob->lmtp_ignore_quota ? OPTION_IGNQ : 0)
2112 | (sx->addrlist->prop.utf8_msg ? OPTION_UTF8 : 0)
2113 /*XXX if we hand peercaps on to continued-conn processes,
2114 must not depend on this addr */
2118 | (sx->ob->size_addition >= 0 ? OPTION_SIZE : 0)
2121 /* Set for IGNOREQUOTA if the response to LHLO specifies support and the
2122 lmtp_ignore_quota option was set. */
2124 sx->igquotstr = sx->peer_offered & OPTION_IGNQ ? US" IGNOREQUOTA" : US"";
2126 /* If the response to EHLO specified support for the SIZE parameter, note
2127 this, provided size_addition is non-negative. */
2129 smtp_peer_options |= sx->peer_offered & OPTION_SIZE;
2131 /* Note whether the server supports PIPELINING. If hosts_avoid_esmtp matched
2132 the current host, esmtp will be false, so PIPELINING can never be used. If
2133 the current host matches hosts_avoid_pipelining, don't do it. */
2135 if ( sx->peer_offered & OPTION_PIPE
2136 && verify_check_given_host(&sx->ob->hosts_avoid_pipelining, sx->host) != OK)
2137 smtp_peer_options |= OPTION_PIPE;
2139 DEBUG(D_transport) debug_printf("%susing PIPELINING\n",
2140 smtp_peer_options & OPTION_PIPE ? "" : "not ");
2142 if ( sx->peer_offered & OPTION_CHUNKING
2143 && verify_check_given_host(&sx->ob->hosts_try_chunking, sx->host) != OK)
2144 sx->peer_offered &= ~OPTION_CHUNKING;
2146 if (sx->peer_offered & OPTION_CHUNKING)
2147 {DEBUG(D_transport) debug_printf("CHUNKING usable\n");}
2149 #ifndef DISABLE_PRDR
2150 if ( sx->peer_offered & OPTION_PRDR
2151 && verify_check_given_host(&sx->ob->hosts_try_prdr, sx->host) != OK)
2152 sx->peer_offered &= ~OPTION_PRDR;
2154 if (sx->peer_offered & OPTION_PRDR)
2155 {DEBUG(D_transport) debug_printf("PRDR usable\n");}
2158 /* Note if the server supports DSN */
2159 smtp_peer_options |= sx->peer_offered & OPTION_DSN;
2160 DEBUG(D_transport) debug_printf("%susing DSN\n",
2161 sx->peer_offered & OPTION_DSN ? "" : "not ");
2163 /* Note if the response to EHLO specifies support for the AUTH extension.
2164 If it has, check that this host is one we want to authenticate to, and do
2165 the business. The host name and address must be available when the
2166 authenticator's client driver is running. */
2168 switch (yield = smtp_auth(sx->buffer, sizeof(sx->buffer), sx->addrlist, sx->host,
2169 sx->ob, sx->esmtp, &sx->inblock, &sx->outblock))
2171 default: goto SEND_QUIT;
2173 case FAIL_SEND: goto SEND_FAILED;
2174 case FAIL: goto RESPONSE_FAILED;
2178 pipelining_active = !!(smtp_peer_options & OPTION_PIPE);
2180 /* The setting up of the SMTP call is now complete. Any subsequent errors are
2181 message-specific. */
2183 sx->setting_up = FALSE;
2186 if (sx->addrlist->prop.utf8_msg)
2188 sx->utf8_needed = !sx->addrlist->prop.utf8_downcvt
2189 && !sx->addrlist->prop.utf8_downcvt_maybe;
2190 DEBUG(D_transport) if (!sx->utf8_needed)
2191 debug_printf("utf8: %s downconvert\n",
2192 sx->addrlist->prop.utf8_downcvt ? "mandatory" : "optional");
2195 /* If this is an international message we need the host to speak SMTPUTF8 */
2196 if (sx->utf8_needed && !(sx->peer_offered & OPTION_UTF8))
2198 errno = ERRNO_UTF8_FWD;
2199 goto RESPONSE_FAILED;
2211 sx->send_quit = check_response(sx->host, &errno, sx->addrlist->more_errno,
2212 sx->buffer, &code, &message, &pass_message);
2217 message = US string_sprintf("send() to %s [%s] failed: %s",
2218 sx->host->name, sx->host->address, strerror(errno));
2219 sx->send_quit = FALSE;
2224 message = string_sprintf("Remote host closed connection in response to %s"
2225 " (EHLO response was: %s)", smtp_command, sx->buffer);
2226 sx->send_quit = FALSE;
2229 /* This label is jumped to directly when a TLS negotiation has failed,
2230 or was not done for a host for which it is required. Values will be set
2231 in message and errno, and setting_up will always be true. Treat as
2232 a temporary error. */
2240 /* The failure happened while setting up the call; see if the failure was
2241 a 5xx response (this will either be on connection, or following HELO - a 5xx
2242 after EHLO causes it to try HELO). If so, and there are no more hosts to try,
2243 fail all addresses, as this host is never going to accept them. For other
2244 errors during setting up (timeouts or whatever), defer all addresses, and
2245 yield DEFER, so that the host is not tried again for a while.
2247 XXX This peeking for another host feels like a layering violation. We want
2248 to note the host as unusable, but down here we shouldn't know if this was
2249 the last host to try for the addr(list). Perhaps the upper layer should be
2250 the one to do set_errno() ? The problem is that currently the addr is where
2251 errno etc. are stashed, but until we run out of hosts to try the errors are
2252 host-specific. Maybe we should enhance the host_item definition? */
2255 sx->ok = FALSE; /* For when reached by GOTO */
2256 set_errno(sx->addrlist, errno, message,
2261 || errno == ERRNO_UTF8_FWD
2264 pass_message, sx->host
2265 #ifdef EXPERIMENTAL_DSN_INFO
2266 , sx->smtp_greeting, sx->helo_response
2276 (void)smtp_write_command(&sx->outblock, SCMD_FLUSH, "QUIT\r\n");
2279 if (sx->cctx.tls_ctx)
2281 tls_close(sx->cctx.tls_ctx, TLS_SHUTDOWN_NOWAIT);
2282 sx->cctx.tls_ctx = NULL;
2286 /* Close the socket, and return the appropriate value, first setting
2287 works because the NULL setting is passed back to the calling process, and
2288 remote_max_parallel is forced to 1 when delivering over an existing connection,
2291 HDEBUG(D_transport|D_acl|D_v) debug_printf_indent(" SMTP(close)>>\n");
2294 shutdown(sx->cctx.sock, SHUT_WR);
2295 if (fcntl(sx->cctx.sock, F_SETFL, O_NONBLOCK) == 0)
2296 for (rc = 16; read(sx->cctx.sock, sx->inbuffer, sizeof(sx->inbuffer)) > 0 && rc > 0;)
2297 rc--; /* drain socket */
2298 sx->send_quit = FALSE;
2300 (void)close(sx->cctx.sock);
2303 #ifndef DISABLE_EVENT
2304 (void) event_raise(sx->tblock->event_action, US"tcp:close", NULL);
2307 continue_transport = NULL;
2308 continue_hostname = NULL;
2315 /* Create the string of options that will be appended to the MAIL FROM:
2316 in the connection context buffer */
2319 build_mailcmd_options(smtp_context * sx, address_item * addrlist)
2321 uschar * p = sx->buffer;
2322 address_item * addr;
2327 /* If we know the receiving MTA supports the SIZE qualification, and we know it,
2328 send it, adding something to the message size to allow for imprecision
2329 and things that get added en route. Exim keeps the number of lines
2330 in a message, so we can give an accurate value for the original message, but we
2331 need some additional to handle added headers. (Double "." characters don't get
2332 included in the count.) */
2334 if ( message_size > 0
2335 && sx->peer_offered & OPTION_SIZE && !(sx->avoid_option & OPTION_SIZE))
2337 /*XXX problem here under spool_files_wireformat?
2338 Or just forget about lines? Or inflate by a fixed proportion? */
2340 sprintf(CS p, " SIZE=%d", message_size+message_linecount+sx->ob->size_addition);
2344 #ifndef DISABLE_PRDR
2345 /* If it supports Per-Recipient Data Reponses, and we have omre than one recipient,
2348 sx->prdr_active = FALSE;
2349 if (sx->peer_offered & OPTION_PRDR)
2350 for (addr = addrlist; addr; addr = addr->next)
2351 if (addr->transport_return == PENDING_DEFER)
2353 for (addr = addr->next; addr; addr = addr->next)
2354 if (addr->transport_return == PENDING_DEFER)
2355 { /* at least two recipients to send */
2356 sx->prdr_active = TRUE;
2357 sprintf(CS p, " PRDR"); p += 5;
2365 /* If it supports internationalised messages, and this meesage need that,
2368 if ( sx->peer_offered & OPTION_UTF8
2369 && addrlist->prop.utf8_msg
2370 && !addrlist->prop.utf8_downcvt
2372 Ustrcpy(p, " SMTPUTF8"), p += 9;
2375 /* check if all addresses have DSN-lasthop flag; do not send RET and ENVID if so */
2376 for (sx->dsn_all_lasthop = TRUE, addr = addrlist, address_count = 0;
2377 addr && address_count < sx->max_rcpt;
2378 addr = addr->next) if (addr->transport_return == PENDING_DEFER)
2381 if (!(addr->dsn_flags & rf_dsnlasthop))
2383 sx->dsn_all_lasthop = FALSE;
2388 /* Add any DSN flags to the mail command */
2390 if (sx->peer_offered & OPTION_DSN && !sx->dsn_all_lasthop)
2392 if (dsn_ret == dsn_ret_hdrs)
2393 { Ustrcpy(p, " RET=HDRS"); p += 9; }
2394 else if (dsn_ret == dsn_ret_full)
2395 { Ustrcpy(p, " RET=FULL"); p += 9; }
2399 string_format(p, sizeof(sx->buffer) - (p-sx->buffer), " ENVID=%s", dsn_envid);
2404 /* If an authenticated_sender override has been specified for this transport
2405 instance, expand it. If the expansion is forced to fail, and there was already
2406 an authenticated_sender for this message, the original value will be used.
2407 Other expansion failures are serious. An empty result is ignored, but there is
2408 otherwise no check - this feature is expected to be used with LMTP and other
2409 cases where non-standard addresses (e.g. without domains) might be required. */
2411 if (smtp_mail_auth_str(p, sizeof(sx->buffer) - (p-sx->buffer), addrlist, sx->ob))
2419 build_rcptcmd_options(smtp_context * sx, const address_item * addr)
2421 uschar * p = sx->buffer;
2424 /* Add any DSN flags to the rcpt command */
2426 if (sx->peer_offered & OPTION_DSN && !(addr->dsn_flags & rf_dsnlasthop))
2428 if (addr->dsn_flags & rf_dsnflags)
2433 Ustrcpy(p, " NOTIFY=");
2435 for (i = 0; i < nelem(rf_list); i++) if (addr->dsn_flags & rf_list[i])
2437 if (!first) *p++ = ',';
2439 Ustrcpy(p, rf_names[i]);
2444 if (addr->dsn_orcpt)
2446 string_format(p, sizeof(sx->buffer) - (p-sx->buffer), " ORCPT=%s",
2457 0 good, rcpt results in addr->transport_return (PENDING_OK, DEFER, FAIL)
2458 -1 MAIL response error
2459 -2 any non-MAIL read i/o error
2460 -3 non-MAIL response timeout
2461 -4 internal error; channel still usable
2466 smtp_write_mail_and_rcpt_cmds(smtp_context * sx, int * yield)
2468 address_item * addr;
2472 if (build_mailcmd_options(sx, sx->first_addr) != OK)
2478 /* From here until we send the DATA command, we can make use of PIPELINING
2479 if the server host supports it. The code has to be able to check the responses
2480 at any point, for when the buffer fills up, so we write it totally generally.
2481 When PIPELINING is off, each command written reports that it has flushed the
2484 sx->pending_MAIL = TRUE; /* The block starts with MAIL */
2487 uschar * s = sx->from_addr;
2489 uschar * errstr = NULL;
2491 /* If we must downconvert, do the from-address here. Remember we had to
2492 for the to-addresses (done below), and also (ugly) for re-doing when building
2493 the delivery log line. */
2495 if ( sx->addrlist->prop.utf8_msg
2496 && (sx->addrlist->prop.utf8_downcvt || !(sx->peer_offered & OPTION_UTF8))
2499 if (s = string_address_utf8_to_alabel(s, &errstr), errstr)
2501 set_errno_nohost(sx->addrlist, ERRNO_EXPANDFAIL, errstr, DEFER, FALSE);
2505 setflag(sx->addrlist, af_utf8_downcvt);
2509 rc = smtp_write_command(&sx->outblock, pipelining_active ? SCMD_BUFFER : SCMD_FLUSH,
2510 "MAIL FROM:<%s>%s\r\n", s, sx->buffer);
2513 mail_command = string_copy(big_buffer); /* Save for later error message */
2517 case -1: /* Transmission error */
2520 case +1: /* Cmd was sent */
2521 if (!smtp_read_response(&sx->inblock, sx->buffer, sizeof(sx->buffer), '2',
2522 sx->ob->command_timeout))
2524 if (errno == 0 && sx->buffer[0] == '4')
2526 errno = ERRNO_MAIL4XX;
2527 sx->addrlist->more_errno |= ((sx->buffer[1] - '0')*10 + sx->buffer[2] - '0') << 8;
2531 sx->pending_MAIL = FALSE;
2534 /* otherwise zero: command queued for pipeline */
2537 /* Pass over all the relevant recipient addresses for this host, which are the
2538 ones that have status PENDING_DEFER. If we are using PIPELINING, we can send
2539 several before we have to read the responses for those seen so far. This
2540 checking is done by a subroutine because it also needs to be done at the end.
2541 Send only up to max_rcpt addresses at a time, leaving next_addr pointing to
2542 the next one if not all are sent.
2544 In the MUA wrapper situation, we want to flush the PIPELINING buffer for the
2545 last address because we want to abort if any recipients have any kind of
2546 problem, temporary or permanent. We know that all recipient addresses will have
2547 the PENDING_DEFER status, because only one attempt is ever made, and we know
2548 that max_rcpt will be large, so all addresses will be done at once.
2550 For verify we flush the pipeline after any (the only) rcpt address. */
2552 for (addr = sx->first_addr, address_count = 0;
2553 addr && address_count < sx->max_rcpt;
2554 addr = addr->next) if (addr->transport_return == PENDING_DEFER)
2560 if (tcp_out_fastopen && !tcp_out_fastopen_logged)
2562 setflag(addr, af_tcp_fastopen_conn);
2563 if (tcp_out_fastopen > 1) setflag(addr, af_tcp_fastopen);
2566 addr->dsn_aware = sx->peer_offered & OPTION_DSN
2567 ? dsn_support_yes : dsn_support_no;
2570 no_flush = pipelining_active && !sx->verify
2571 && (!mua_wrapper || addr->next && address_count < sx->max_rcpt);
2573 build_rcptcmd_options(sx, addr);
2575 /* Now send the RCPT command, and process outstanding responses when
2576 necessary. After a timeout on RCPT, we just end the function, leaving the
2577 yield as OK, because this error can often mean that there is a problem with
2578 just one address, so we don't want to delay the host. */
2580 rcpt_addr = transport_rcpt_address(addr, sx->tblock->rcpt_include_affixes);
2583 if ( testflag(sx->addrlist, af_utf8_downcvt)
2584 && !(rcpt_addr = string_address_utf8_to_alabel(rcpt_addr, NULL))
2587 /*XXX could we use a per-address errstr here? Not fail the whole send? */
2588 errno = ERRNO_EXPANDFAIL;
2589 return -5; /*XXX too harsh? */
2593 count = smtp_write_command(&sx->outblock, no_flush ? SCMD_BUFFER : SCMD_FLUSH,
2594 "RCPT TO:<%s>%s%s\r\n", rcpt_addr, sx->igquotstr, sx->buffer);
2596 if (count < 0) return -5;
2599 switch(sync_responses(sx, count, 0))
2601 case 3: sx->ok = TRUE; /* 2xx & 5xx => OK & progress made */
2602 case 2: sx->completed_addr = TRUE; /* 5xx (only) => progress made */
2605 case 1: sx->ok = TRUE; /* 2xx (only) => OK, but if LMTP, */
2606 if (!sx->lmtp) /* can't tell about progress yet */
2607 sx->completed_addr = TRUE;
2608 case 0: /* No 2xx or 5xx, but no probs */
2611 case -1: return -3; /* Timeout on RCPT */
2612 case -2: return -2; /* non-MAIL read i/o error */
2613 default: return -1; /* any MAIL error */
2615 sx->pending_MAIL = FALSE; /* Dealt with MAIL */
2617 } /* Loop for next address */
2619 tcp_out_fastopen_logged = TRUE;
2620 sx->next_addr = addr;
2626 /*****************************************************
2627 * Proxy TLS connection for another transport process *
2628 ******************************************************/
2630 Close the unused end of the pipe, fork once more, then use the given buffer
2631 as a staging area, and select on both the given fd and the TLS'd client-fd for
2632 data to read (per the coding in ip_recv() and fd_ready() this is legitimate).
2633 Do blocking full-size writes, and reads under a timeout. Once both input
2634 channels are closed, exit the process.
2638 buf space to use for buffering
2639 bufsiz size of buffer
2640 pfd pipe filedescriptor array; [0] is comms to proxied process
2641 timeout per-read timeout, seconds
2645 smtp_proxy_tls(void * ct_ctx, uschar * buf, size_t bsize, int * pfd,
2649 int max_fd = MAX(pfd[0], tls_out.active.sock) + 1;
2650 int rc, i, fd_bits, nbytes;
2655 DEBUG(D_transport) debug_printf("proxy-proc final-pid %d\n", rc);
2656 _exit(rc < 0 ? EXIT_FAILURE : EXIT_SUCCESS);
2659 if (running_in_test_harness) millisleep(100); /* let parent debug out */
2660 set_process_info("proxying TLS connection for continued transport");
2662 FD_SET(tls_out.active.sock, &rfds);
2663 FD_SET(pfd[0], &rfds);
2665 for (fd_bits = 3; fd_bits; )
2667 time_t time_left = timeout;
2668 time_t time_start = time(NULL);
2674 struct timeval tv = { time_left, 0 };
2677 (SELECT_ARG2_TYPE *)&rfds, NULL, (SELECT_ARG2_TYPE *)&efds, &tv);
2679 if (rc < 0 && errno == EINTR)
2680 if ((time_left -= time(NULL) - time_start) > 0) continue;
2684 DEBUG(D_transport) if (rc == 0) debug_printf("%s: timed out\n", __FUNCTION__);
2688 if (FD_ISSET(tls_out.active.sock, &efds) || FD_ISSET(pfd[0], &efds))
2690 DEBUG(D_transport) debug_printf("select: exceptional cond on %s fd\n",
2691 FD_ISSET(pfd[0], &efds) ? "proxy" : "tls");
2695 while (rc < 0 || !(FD_ISSET(tls_out.active.sock, &rfds) || FD_ISSET(pfd[0], &rfds)));
2697 /* handle inbound data */
2698 if (FD_ISSET(tls_out.active.sock, &rfds))
2699 if ((rc = tls_read(ct_ctx, buf, bsize)) <= 0)
2702 FD_CLR(tls_out.active.sock, &rfds);
2703 shutdown(pfd[0], SHUT_WR);
2708 for (nbytes = 0; rc - nbytes > 0; nbytes += i)
2709 if ((i = write(pfd[0], buf + nbytes, rc - nbytes)) < 0) goto done;
2711 else if (fd_bits & 1)
2712 FD_SET(tls_out.active.sock, &rfds);
2714 /* handle outbound data */
2715 if (FD_ISSET(pfd[0], &rfds))
2716 if ((rc = read(pfd[0], buf, bsize)) <= 0)
2719 tls_close(ct_ctx, TLS_SHUTDOWN_NOWAIT);
2724 for (nbytes = 0; rc - nbytes > 0; nbytes += i)
2725 if ((i = tls_write(ct_ctx, buf + nbytes, rc - nbytes, FALSE)) < 0)
2728 else if (fd_bits & 2)
2729 FD_SET(pfd[0], &rfds);
2733 if (running_in_test_harness) millisleep(100); /* let logging complete */
2734 exim_exit(0, US"TLS proxy");
2739 /*************************************************
2740 * Deliver address list to given host *
2741 *************************************************/
2743 /* If continue_hostname is not null, we get here only when continuing to
2744 deliver down an existing channel. The channel was passed as the standard
2745 input. TLS is never active on a passed channel; the previous process always
2746 closes it down before passing the connection on.
2748 Otherwise, we have to make a connection to the remote host, and do the
2749 initial protocol exchange.
2751 When running as an MUA wrapper, if the sender or any recipient is rejected,
2752 temporarily or permanently, we force failure for all recipients.
2755 addrlist chain of potential addresses to deliver; only those whose
2756 transport_return field is set to PENDING_DEFER are currently
2757 being processed; others should be skipped - they have either
2758 been delivered to an earlier host or IP address, or been
2759 failed by one of them.
2760 host host to deliver to
2761 host_af AF_INET or AF_INET6
2762 defport default TCP/IP port to use if host does not specify, in host
2764 interface interface to bind to, or NULL
2765 tblock transport instance block
2766 message_defer set TRUE if yield is OK, but all addresses were deferred
2767 because of a non-recipient, non-host failure, that is, a
2768 4xx response to MAIL FROM, DATA, or ".". This is a defer
2769 that is specific to the message.
2770 suppress_tls if TRUE, don't attempt a TLS connection - this is set for
2771 a second attempt after TLS initialization fails
2773 Returns: OK - the connection was made and the delivery attempted;
2774 the result for each address is in its data block.
2775 DEFER - the connection could not be made, or something failed
2776 while setting up the SMTP session, or there was a
2777 non-message-specific error, such as a timeout.
2778 ERROR - a filter command is specified for this transport,
2779 and there was a problem setting it up; OR helo_data
2780 or add_headers or authenticated_sender is specified
2781 for this transport, and the string failed to expand
2785 smtp_deliver(address_item *addrlist, host_item *host, int host_af, int defport,
2786 uschar *interface, transport_instance *tblock,
2787 BOOL *message_defer, BOOL suppress_tls)
2793 struct timeval start_delivery_time;
2795 BOOL pass_message = FALSE;
2796 uschar *message = NULL;
2797 uschar new_message_id[MESSAGE_ID_LENGTH + 1];
2801 gettimeofday(&start_delivery_time, NULL);
2802 suppress_tls = suppress_tls; /* stop compiler warning when no TLS support */
2803 *message_defer = FALSE;
2805 sx.addrlist = addrlist;
2807 sx.host_af = host_af,
2809 sx.interface = interface;
2810 sx.helo_data = NULL;
2814 /* Get the channel set up ready for a message (MAIL FROM being the next
2815 SMTP command to send */
2817 if ((rc = smtp_setup_conn(&sx, suppress_tls)) != OK)
2820 /* If there is a filter command specified for this transport, we can now
2821 set it up. This cannot be done until the identify of the host is known. */
2823 if (tblock->filter_command)
2825 transport_filter_timeout = tblock->filter_timeout;
2827 /* On failure, copy the error to all addresses, abandon the SMTP call, and
2830 if (!transport_set_up_command(&transport_filter_argv,
2831 tblock->filter_command, TRUE, DEFER, addrlist,
2832 string_sprintf("%.50s transport", tblock->name), NULL))
2834 set_errno_nohost(addrlist->next, addrlist->basic_errno, addrlist->message, DEFER,
2840 if ( transport_filter_argv
2841 && *transport_filter_argv
2842 && **transport_filter_argv
2843 && sx.peer_offered & OPTION_CHUNKING
2846 sx.peer_offered &= ~OPTION_CHUNKING;
2847 DEBUG(D_transport) debug_printf("CHUNKING not usable due to transport filter\n");
2851 sx.first_addr = addrlist;
2853 /* For messages that have more than the maximum number of envelope recipients,
2854 we want to send several transactions down the same SMTP connection. (See
2855 comments in deliver.c as to how this reconciles, heuristically, with
2856 remote_max_parallel.) This optimization was added to Exim after the following
2857 code was already working. The simplest way to put it in without disturbing the
2858 code was to use a goto to jump back to this point when there is another
2859 transaction to handle. */
2862 sx.from_addr = return_path;
2863 sx.sync_addr = sx.first_addr;
2865 sx.send_rset = TRUE;
2866 sx.completed_addr = FALSE;
2869 /* If we are a continued-connection-after-verify the MAIL and RCPT
2870 commands were already sent; do not re-send but do mark the addrs as
2871 having been accepted up to RCPT stage. A traditional cont-conn
2872 always has a sequence number greater than one. */
2874 if (continue_hostname && continue_sequence == 1)
2876 address_item * addr;
2878 sx.peer_offered = smtp_peer_options;
2879 sx.pending_MAIL = FALSE;
2881 sx.next_addr = NULL;
2883 for (addr = addrlist; addr; addr = addr->next)
2884 addr->transport_return = PENDING_OK;
2888 /* Initiate a message transfer. */
2890 switch(smtp_write_mail_and_rcpt_cmds(&sx, &yield))
2893 case -1: case -2: goto RESPONSE_FAILED;
2894 case -3: goto END_OFF;
2895 case -4: goto SEND_QUIT;
2896 default: goto SEND_FAILED;
2899 /* If we are an MUA wrapper, abort if any RCPTs were rejected, either
2900 permanently or temporarily. We should have flushed and synced after the last
2908 for (a = sx.first_addr, cnt = 0; a && cnt < sx.max_rcpt; a = a->next, cnt++)
2909 if (a->transport_return != PENDING_OK)
2911 /*XXX could we find a better errno than 0 here? */
2912 set_errno_nohost(addrlist, 0, a->message, FAIL,
2913 testflag(a, af_pass_message));
2920 /* If ok is TRUE, we know we have got at least one good recipient, and must now
2921 send DATA, but if it is FALSE (in the normal, non-wrapper case), we may still
2922 have a good recipient buffered up if we are pipelining. We don't want to waste
2923 time sending DATA needlessly, so we only send it if either ok is TRUE or if we
2924 are pipelining. The responses are all handled by sync_responses().
2925 If using CHUNKING, do not send a BDAT until we know how big a chunk we want
2928 if ( !(sx.peer_offered & OPTION_CHUNKING)
2929 && (sx.ok || (pipelining_active && !mua_wrapper)))
2931 int count = smtp_write_command(&sx.outblock, SCMD_FLUSH, "DATA\r\n");
2933 if (count < 0) goto SEND_FAILED;
2934 switch(sync_responses(&sx, count, sx.ok ? +1 : -1))
2936 case 3: sx.ok = TRUE; /* 2xx & 5xx => OK & progress made */
2937 case 2: sx.completed_addr = TRUE; /* 5xx (only) => progress made */
2940 case 1: sx.ok = TRUE; /* 2xx (only) => OK, but if LMTP, */
2941 if (!sx.lmtp) sx.completed_addr = TRUE; /* can't tell about progress yet */
2942 case 0: break; /* No 2xx or 5xx, but no probs */
2944 case -1: goto END_OFF; /* Timeout on RCPT */
2945 default: goto RESPONSE_FAILED; /* I/O error, or any MAIL/DATA error */
2947 pipelining_active = FALSE;
2948 data_command = string_copy(big_buffer); /* Save for later error message */
2951 /* If there were no good recipients (but otherwise there have been no
2952 problems), just set ok TRUE, since we have handled address-specific errors
2953 already. Otherwise, it's OK to send the message. Use the check/escape mechanism
2954 for handling the SMTP dot-handling protocol, flagging to apply to headers as
2955 well as body. Set the appropriate timeout value to be used for each chunk.
2956 (Haven't been able to make it work using select() for writing yet.) */
2958 if (!(sx.peer_offered & OPTION_CHUNKING) && !sx.ok)
2960 /* Save the first address of the next batch. */
2961 sx.first_addr = sx.next_addr;
2967 transport_ctx tctx = {
2968 {sx.cctx.sock}, /*XXX will this need TLS info? */
2971 US".", US"..", /* Escaping strings */
2972 topt_use_crlf | topt_escape_headers
2973 | (tblock->body_only ? topt_no_headers : 0)
2974 | (tblock->headers_only ? topt_no_body : 0)
2975 | (tblock->return_path_add ? topt_add_return_path : 0)
2976 | (tblock->delivery_date_add ? topt_add_delivery_date : 0)
2977 | (tblock->envelope_to_add ? topt_add_envelope_to : 0)
2980 /* If using CHUNKING we need a callback from the generic transport
2981 support to us, for the sending of BDAT smtp commands and the reaping
2982 of responses. The callback needs a whole bunch of state so set up
2983 a transport-context structure to be passed around. */
2985 if (sx.peer_offered & OPTION_CHUNKING)
2987 tctx.check_string = tctx.escape_string = NULL;
2988 tctx.options |= topt_use_bdat;
2989 tctx.chunk_cb = smtp_chunk_cmd_callback;
2990 sx.pending_BDAT = FALSE;
2991 sx.good_RCPT = sx.ok;
2993 tctx.smtp_context = &sx;
2996 tctx.options |= topt_end_dot;
2998 /* Save the first address of the next batch. */
2999 sx.first_addr = sx.next_addr;
3001 /* Responses from CHUNKING commands go in buffer. Otherwise,
3002 there has not been a response. */
3006 sigalrm_seen = FALSE;
3007 transport_write_timeout = sx.ob->data_timeout;
3008 smtp_command = US"sending data block"; /* For error messages */
3009 DEBUG(D_transport|D_v)
3010 if (sx.peer_offered & OPTION_CHUNKING)
3011 debug_printf(" will write message using CHUNKING\n");
3013 debug_printf(" SMTP>> writing message and terminating \".\"\n");
3014 transport_count = 0;
3016 #ifndef DISABLE_DKIM
3017 dkim_exim_sign_init();
3018 # ifdef EXPERIMENTAL_ARC
3020 uschar * s = sx.ob->arc_sign;
3023 if (!(sx.ob->dkim.arc_signspec = s = expand_string(s)))
3025 if (!expand_string_forcedfail)
3027 message = US"failed to expand arc_sign";
3034 /* Ask dkim code to hash the body for ARC */
3035 (void) arc_ams_setup_sign_bodyhash();
3036 sx.ob->dkim.force_bodyhash = TRUE;
3041 sx.ok = dkim_transport_write_message(&tctx, &sx.ob->dkim, CUSS &message);
3043 sx.ok = transport_write_message(&tctx, 0);
3046 /* transport_write_message() uses write() because it is called from other
3047 places to write to non-sockets. This means that under some OS (e.g. Solaris)
3048 it can exit with "Broken pipe" as its error. This really means that the
3049 socket got closed at the far end. */
3051 transport_write_timeout = 0; /* for subsequent transports */
3053 /* Failure can either be some kind of I/O disaster (including timeout),
3054 or the failure of a transport filter or the expansion of added headers.
3055 Or, when CHUNKING, it can be a protocol-detected failure. */
3058 if (message) goto SEND_FAILED;
3059 else goto RESPONSE_FAILED;
3061 /* We used to send the terminating "." explicitly here, but because of
3062 buffering effects at both ends of TCP/IP connections, you don't gain
3063 anything by keeping it separate, so it might as well go in the final
3064 data buffer for efficiency. This is now done by setting the topt_end_dot
3067 smtp_command = US"end of data";
3069 if (sx.peer_offered & OPTION_CHUNKING && sx.cmd_count > 1)
3071 /* Reap any outstanding MAIL & RCPT commands, but not a DATA-go-ahead */
3072 switch(sync_responses(&sx, sx.cmd_count-1, 0))
3074 case 3: sx.ok = TRUE; /* 2xx & 5xx => OK & progress made */
3075 case 2: sx.completed_addr = TRUE; /* 5xx (only) => progress made */
3078 case 1: sx.ok = TRUE; /* 2xx (only) => OK, but if LMTP, */
3079 if (!sx.lmtp) sx.completed_addr = TRUE; /* can't tell about progress yet */
3080 case 0: break; /* No 2xx or 5xx, but no probs */
3082 case -1: goto END_OFF; /* Timeout on RCPT */
3083 default: goto RESPONSE_FAILED; /* I/O error, or any MAIL/DATA error */
3087 #ifndef DISABLE_PRDR
3088 /* For PRDR we optionally get a partial-responses warning
3089 * followed by the individual responses, before going on with
3090 * the overall response. If we don't get the warning then deal
3091 * with per non-PRDR. */
3094 sx.ok = smtp_read_response(&sx.inblock, sx.buffer, sizeof(sx.buffer), '3',
3095 sx.ob->final_timeout);
3096 if (!sx.ok && errno == 0) switch(sx.buffer[0])
3098 case '2': sx.prdr_active = FALSE;
3101 case '4': errno = ERRNO_DATA4XX;
3102 addrlist->more_errno |=
3103 ((sx.buffer[1] - '0')*10 + sx.buffer[2] - '0') << 8;
3110 /* For non-PRDR SMTP, we now read a single response that applies to the
3111 whole message. If it is OK, then all the addresses have been delivered. */
3115 sx.ok = smtp_read_response(&sx.inblock, sx.buffer, sizeof(sx.buffer), '2',
3116 sx.ob->final_timeout);
3117 if (!sx.ok && errno == 0 && sx.buffer[0] == '4')
3119 errno = ERRNO_DATA4XX;
3120 addrlist->more_errno |= ((sx.buffer[1] - '0')*10 + sx.buffer[2] - '0') << 8;
3124 /* For LMTP, we get back a response for every RCPT command that we sent;
3125 some may be accepted and some rejected. For those that get a response, their
3126 status is fixed; any that are accepted have been handed over, even if later
3127 responses crash - at least, that's how I read RFC 2033.
3129 If all went well, mark the recipient addresses as completed, record which
3130 host/IPaddress they were delivered to, and cut out RSET when sending another
3131 message down the same channel. Write the completed addresses to the journal
3132 now so that they are recorded in case there is a crash of hardware or
3133 software before the spool gets updated. Also record the final SMTP
3134 confirmation if needed (for SMTP only). */
3139 struct timeval delivery_time;
3141 uschar * conf = NULL;
3143 timesince(&delivery_time, &start_delivery_time);
3144 sx.send_rset = FALSE;
3145 pipelining_active = FALSE;
3147 /* Set up confirmation if needed - applies only to SMTP */
3150 #ifdef DISABLE_EVENT
3151 LOGGING(smtp_confirmation) &&
3156 const uschar *s = string_printing(sx.buffer);
3157 /* deconst cast ok here as string_printing was checked to have alloc'n'copied */
3158 conf = (s == sx.buffer)? US string_copy(s) : US s;
3161 /* Process all transported addresses - for LMTP or PRDR, read a status for
3164 for (addr = addrlist; addr != sx.first_addr; addr = addr->next)
3166 if (addr->transport_return != PENDING_OK) continue;
3168 /* LMTP - if the response fails badly (e.g. timeout), use it for all the
3169 remaining addresses. Otherwise, it's a return code for just the one
3170 address. For temporary errors, add a retry item for the address so that
3171 it doesn't get tried again too soon. */
3173 #ifndef DISABLE_PRDR
3174 if (sx.lmtp || sx.prdr_active)
3179 if (!smtp_read_response(&sx.inblock, sx.buffer, sizeof(sx.buffer), '2',
3180 sx.ob->final_timeout))
3182 if (errno != 0 || sx.buffer[0] == 0) goto RESPONSE_FAILED;
3183 addr->message = string_sprintf(
3184 #ifndef DISABLE_PRDR
3185 "%s error after %s: %s", sx.prdr_active ? "PRDR":"LMTP",
3187 "LMTP error after %s: %s",
3189 data_command, string_printing(sx.buffer));
3190 setflag(addr, af_pass_message); /* Allow message to go to user */
3191 if (sx.buffer[0] == '5')
3192 addr->transport_return = FAIL;
3195 errno = ERRNO_DATA4XX;
3196 addr->more_errno |= ((sx.buffer[1] - '0')*10 + sx.buffer[2] - '0') << 8;
3197 addr->transport_return = DEFER;
3198 #ifndef DISABLE_PRDR
3199 if (!sx.prdr_active)
3201 retry_add_item(addr, addr->address_retry_key, 0);
3205 sx.completed_addr = TRUE; /* NOW we can set this flag */
3206 if (LOGGING(smtp_confirmation))
3208 const uschar *s = string_printing(sx.buffer);
3209 /* deconst cast ok here as string_printing was checked to have alloc'n'copied */
3210 conf = (s == sx.buffer) ? US string_copy(s) : US s;
3214 /* SMTP, or success return from LMTP for this address. Pass back the
3215 actual host that was used. */
3217 addr->transport_return = OK;
3218 addr->more_errno = delivery_time.tv_sec;
3219 addr->delivery_usec = delivery_time.tv_usec;
3220 addr->host_used = host;
3221 addr->special_action = flag;
3222 addr->message = conf;
3223 #ifndef DISABLE_PRDR
3224 if (sx.prdr_active) setflag(addr, af_prdr_used);
3226 if (sx.peer_offered & OPTION_CHUNKING) setflag(addr, af_chunking_used);
3229 #ifndef DISABLE_PRDR
3230 if (!sx.prdr_active)
3233 /* Update the journal. For homonymic addresses, use the base address plus
3234 the transport name. See lots of comments in deliver.c about the reasons
3235 for the complications when homonyms are involved. Just carry on after
3236 write error, as it may prove possible to update the spool file later. */
3238 if (testflag(addr, af_homonym))
3239 sprintf(CS sx.buffer, "%.500s/%s\n", addr->unique + 3, tblock->name);
3241 sprintf(CS sx.buffer, "%.500s\n", addr->unique);
3243 DEBUG(D_deliver) debug_printf("S:journalling %s\n", sx.buffer);
3244 len = Ustrlen(CS sx.buffer);
3245 if (write(journal_fd, sx.buffer, len) != len)
3246 log_write(0, LOG_MAIN|LOG_PANIC, "failed to write journal for "
3247 "%s: %s", sx.buffer, strerror(errno));
3251 #ifndef DISABLE_PRDR
3254 const uschar * overall_message;
3256 /* PRDR - get the final, overall response. For any non-success
3257 upgrade all the address statuses. */
3259 sx.ok = smtp_read_response(&sx.inblock, sx.buffer, sizeof(sx.buffer), '2',
3260 sx.ob->final_timeout);
3263 if(errno == 0 && sx.buffer[0] == '4')
3265 errno = ERRNO_DATA4XX;
3266 addrlist->more_errno |= ((sx.buffer[1] - '0')*10 + sx.buffer[2] - '0') << 8;
3268 for (addr = addrlist; addr != sx.first_addr; addr = addr->next)
3269 if (sx.buffer[0] == '5' || addr->transport_return == OK)
3270 addr->transport_return = PENDING_OK; /* allow set_errno action */
3271 goto RESPONSE_FAILED;
3274 /* Append the overall response to the individual PRDR response for logging
3275 and update the journal, or setup retry. */
3277 overall_message = string_printing(sx.buffer);
3278 for (addr = addrlist; addr != sx.first_addr; addr = addr->next)
3279 if (addr->transport_return == OK)
3280 addr->message = string_sprintf("%s\\n%s", addr->message, overall_message);
3282 for (addr = addrlist; addr != sx.first_addr; addr = addr->next)
3283 if (addr->transport_return == OK)
3285 if (testflag(addr, af_homonym))
3286 sprintf(CS sx.buffer, "%.500s/%s\n", addr->unique + 3, tblock->name);
3288 sprintf(CS sx.buffer, "%.500s\n", addr->unique);
3290 DEBUG(D_deliver) debug_printf("journalling(PRDR) %s\n", sx.buffer);
3291 len = Ustrlen(CS sx.buffer);
3292 if (write(journal_fd, sx.buffer, len) != len)
3293 log_write(0, LOG_MAIN|LOG_PANIC, "failed to write journal for "
3294 "%s: %s", sx.buffer, strerror(errno));
3296 else if (addr->transport_return == DEFER)
3297 retry_add_item(addr, addr->address_retry_key, -2);
3301 /* Ensure the journal file is pushed out to disk. */
3303 if (EXIMfsync(journal_fd) < 0)
3304 log_write(0, LOG_MAIN|LOG_PANIC, "failed to fsync journal: %s",
3310 /* Handle general (not specific to one address) failures here. The value of ok
3311 is used to skip over this code on the falling through case. A timeout causes a
3312 deferral. Other errors may defer or fail according to the response code, and
3313 may set up a special errno value, e.g. after connection chopped, which is
3314 assumed if errno == 0 and there is no text in the buffer. If control reaches
3315 here during the setting up phase (i.e. before MAIL FROM) then always defer, as
3316 the problem is not related to this specific message. */
3321 uschar * set_message;
3327 sx.send_quit = check_response(host, &save_errno, addrlist->more_errno,
3328 sx.buffer, &code, &message, &pass_message);
3336 message = string_sprintf("send() to %s [%s] failed: %s",
3337 host->name, host->address, message ? message : US strerror(save_errno));
3338 sx.send_quit = FALSE;
3346 sx.ok = FALSE; /* For when reached by GOTO */
3347 set_message = message;
3349 /* We want to handle timeouts after MAIL or "." and loss of connection after
3350 "." specially. They can indicate a problem with the sender address or with
3351 the contents of the message rather than a real error on the connection. These
3352 cases are treated in the same way as a 4xx response. This next bit of code
3353 does the classification. */
3360 message_error = TRUE;
3364 message_error = Ustrncmp(smtp_command,"MAIL",4) == 0 ||
3365 Ustrncmp(smtp_command,"end ",4) == 0;
3368 case ERRNO_SMTPCLOSED:
3369 message_error = Ustrncmp(smtp_command,"end ",4) == 0;
3373 message_error = FALSE;
3377 /* Handle the cases that are treated as message errors. These are:
3379 (a) negative response or timeout after MAIL
3380 (b) negative response after DATA
3381 (c) negative response or timeout or dropped connection after "."
3382 (d) utf8 support required and not offered
3384 It won't be a negative response or timeout after RCPT, as that is dealt
3385 with separately above. The action in all cases is to set an appropriate
3386 error code for all the addresses, but to leave yield set to OK because the
3387 host itself has not failed. Of course, it might in practice have failed
3388 when we've had a timeout, but if so, we'll discover that at the next
3389 delivery attempt. For a temporary error, set the message_defer flag, and
3390 write to the logs for information if this is not the last host. The error
3391 for the last host will be logged as part of the address's log line. */
3395 if (mua_wrapper) code = '5'; /* Force hard failure in wrapper mode */
3397 /* If there's an errno, the message contains just the identity of
3402 else /* Anything other than 5 is treated as temporary */
3406 message = US string_sprintf("%s: %s", message, strerror(save_errno));
3408 write_logs(host, message, sx.first_addr ? sx.first_addr->basic_errno : 0);
3410 *message_defer = TRUE;
3414 /* Otherwise, we have an I/O error or a timeout other than after MAIL or
3415 ".", or some other transportation error. We defer all addresses and yield
3416 DEFER, except for the case of failed add_headers expansion, or a transport
3417 filter failure, when the yield should be ERROR, to stop it trying other
3423 yield = (save_errno == ERRNO_CHHEADER_FAIL ||
3424 save_errno == ERRNO_FILTER_FAIL)? ERROR : DEFER;
3428 set_errno(addrlist, save_errno, set_message, set_rc, pass_message, host
3429 #ifdef EXPERIMENTAL_DSN_INFO
3430 , sx.smtp_greeting, sx.helo_response
3436 /* If all has gone well, send_quit will be set TRUE, implying we can end the
3437 SMTP session tidily. However, if there were too many addresses to send in one
3438 message (indicated by first_addr being non-NULL) we want to carry on with the
3439 rest of them. Also, it is desirable to send more than one message down the SMTP
3440 connection if there are several waiting, provided we haven't already sent so
3441 many as to hit the configured limit. The function transport_check_waiting looks
3442 for a waiting message and returns its id. Then transport_pass_socket tries to
3443 set up a continued delivery by passing the socket on to another process. The
3444 variable send_rset is FALSE if a message has just been successfully transfered.
3446 If we are already sending down a continued channel, there may be further
3447 addresses not yet delivered that are aimed at the same host, but which have not
3448 been passed in this run of the transport. In this case, continue_more will be
3449 true, and all we should do is send RSET if necessary, and return, leaving the
3452 However, if no address was disposed of, i.e. all addresses got 4xx errors, we
3453 do not want to continue with other messages down the same channel, because that
3454 can lead to looping between two or more messages, all with the same,
3455 temporarily failing address(es). [The retry information isn't updated yet, so
3456 new processes keep on trying.] We probably also don't want to try more of this
3457 message's addresses either.
3459 If we have started a TLS session, we have to end it before passing the
3460 connection to a new process. However, not all servers can handle this (Exim
3461 can), so we do not pass such a connection on if the host matches
3462 hosts_nopass_tls. */
3465 debug_printf("ok=%d send_quit=%d send_rset=%d continue_more=%d "
3466 "yield=%d first_address is %sNULL\n", sx.ok, sx.send_quit,
3467 sx.send_rset, continue_more, yield, sx.first_addr ? "not " : "");
3469 if (sx.completed_addr && sx.ok && sx.send_quit)
3472 smtp_compare_t t_compare;
3474 t_compare.tblock = tblock;
3475 t_compare.current_sender_address = sender_address;
3477 if ( sx.first_addr != NULL
3481 ( tls_out.active.sock < 0 && !continue_proxy_cipher
3482 || verify_check_given_host(&sx.ob->hosts_nopass_tls, host) != OK
3486 transport_check_waiting(tblock->name, host->name,
3487 tblock->connection_max_messages, new_message_id, &more,
3488 (oicf)smtp_are_same_identities, (void*)&t_compare)
3495 if (! (sx.ok = smtp_write_command(&sx.outblock, SCMD_FLUSH, "RSET\r\n") >= 0))
3497 msg = US string_sprintf("send() to %s [%s] failed: %s", host->name,
3498 host->address, strerror(errno));
3499 sx.send_quit = FALSE;
3501 else if (! (sx.ok = smtp_read_response(&sx.inblock, sx.buffer,
3502 sizeof(sx.buffer), '2', sx.ob->command_timeout)))
3505 sx.send_quit = check_response(host, &errno, 0, sx.buffer, &code, &msg,
3509 DEBUG(D_transport) debug_printf("H=%s [%s] %s\n",
3510 host->name, host->address, msg);
3514 /* Either RSET was not needed, or it succeeded */
3519 int socket_fd = sx.cctx.sock;
3522 if (sx.first_addr != NULL) /* More addresses still to be sent */
3523 { /* in this run of the transport */
3524 continue_sequence++; /* Causes * in logging */
3528 /* Unless caller said it already has more messages listed for this host,
3529 pass the connection on to a new Exim process (below, the call to
3530 transport_pass_socket). If the caller has more ready, just return with
3531 the connection still open. */
3534 if (tls_out.active.sock >= 0)
3536 || verify_check_given_host(&sx.ob->hosts_noproxy_tls, host) == OK)
3538 /* Before passing the socket on, or returning to caller with it still
3539 open, we must shut down TLS. Not all MTAs allow for the continuation
3540 of the SMTP session when TLS is shut down. We test for this by sending
3541 a new EHLO. If we don't get a good response, we don't attempt to pass
3544 tls_close(sx.cctx.tls_ctx, TLS_SHUTDOWN_WAIT);
3545 sx.cctx.tls_ctx = NULL;
3546 smtp_peer_options = smtp_peer_options_wrap;
3548 && smtp_write_command(&sx.outblock, SCMD_FLUSH,
3549 "EHLO %s\r\n", sx.helo_data) >= 0
3550 && smtp_read_response(&sx.inblock, sx.buffer, sizeof(sx.buffer),
3551 '2', sx.ob->command_timeout);
3553 if (sx.ok && continue_more)
3554 return yield; /* More addresses for another run */
3558 /* Set up a pipe for proxying TLS for the new transport process */
3560 smtp_peer_options |= OPTION_TLS;
3561 if (sx.ok = (socketpair(AF_UNIX, SOCK_STREAM, 0, pfd) == 0))
3564 set_errno(sx.first_addr, errno, US"internal allocation problem",
3566 # ifdef EXPERIMENTAL_DSN_INFO
3567 , sx.smtp_greeting, sx.helo_response
3574 return yield; /* More addresses for another run */
3576 /* If the socket is successfully passed, we mustn't send QUIT (or
3577 indeed anything!) from here. */
3579 /*XXX DSN_INFO: assume likely to do new HELO; but for greet we'll want to
3580 propagate it from the initial
3582 if (sx.ok && transport_pass_socket(tblock->name, host->name,
3583 host->address, new_message_id, socket_fd))
3585 sx.send_quit = FALSE;
3587 /* We have passed the client socket to a fresh transport process.
3588 If TLS is still active, we need to proxy it for the transport we
3589 just passed the baton to. Fork a child to to do it, and return to
3590 get logging done asap. Which way to place the work makes assumptions
3591 about post-fork prioritisation which may not hold on all platforms. */
3593 if (tls_out.active.sock >= 0)
3596 if (pid == 0) /* child; fork again to disconnect totally */
3598 if (running_in_test_harness) millisleep(100); /* let parent debug out */
3599 /* does not return */
3600 smtp_proxy_tls(sx.cctx.tls_ctx, sx.buffer, sizeof(sx.buffer), pfd,
3601 sx.ob->command_timeout);
3604 if (pid > 0) /* parent */
3606 DEBUG(D_transport) debug_printf("proxy-proc inter-pid %d\n", pid);
3608 /* tidy the inter-proc to disconn the proxy proc */
3609 waitpid(pid, NULL, 0);
3610 tls_close(sx.cctx.tls_ctx, TLS_NO_SHUTDOWN);
3611 sx.cctx.tls_ctx = NULL;
3612 (void)close(sx.cctx.sock);
3614 continue_transport = NULL;
3615 continue_hostname = NULL;
3618 log_write(0, LOG_PANIC_DIE, "fork failed");
3624 /* If RSET failed and there are addresses left, they get deferred. */
3626 set_errno(sx.first_addr, errno, msg, DEFER, FALSE, host
3627 #ifdef EXPERIMENTAL_DSN_INFO
3628 , sx.smtp_greeting, sx.helo_response
3634 /* End off tidily with QUIT unless the connection has died or the socket has
3635 been passed to another process. There has been discussion on the net about what
3636 to do after sending QUIT. The wording of the RFC suggests that it is necessary
3637 to wait for a response, but on the other hand, there isn't anything one can do
3638 with an error response, other than log it. Exim used to do that. However,
3639 further discussion suggested that it is positively advantageous not to wait for
3640 the response, but to close the session immediately. This is supposed to move
3641 the TCP/IP TIME_WAIT state from the server to the client, thereby removing some
3642 load from the server. (Hosts that are both servers and clients may not see much
3643 difference, of course.) Further discussion indicated that this was safe to do
3644 on Unix systems which have decent implementations of TCP/IP that leave the
3645 connection around for a while (TIME_WAIT) after the application has gone away.
3646 This enables the response sent by the server to be properly ACKed rather than
3647 timed out, as can happen on broken TCP/IP implementations on other OS.
3649 This change is being made on 31-Jul-98. After over a year of trouble-free
3650 operation, the old commented-out code was removed on 17-Sep-99. */
3653 if (sx.send_quit) (void)smtp_write_command(&sx.outblock, SCMD_FLUSH, "QUIT\r\n");
3658 tls_close(sx.cctx.tls_ctx, TLS_SHUTDOWN_NOWAIT);
3659 sx.cctx.tls_ctx = NULL;
3662 /* Close the socket, and return the appropriate value, first setting
3663 works because the NULL setting is passed back to the calling process, and
3664 remote_max_parallel is forced to 1 when delivering over an existing connection,
3666 If all went well and continue_more is set, we shouldn't actually get here if
3667 there are further addresses, as the return above will be taken. However,
3668 writing RSET might have failed, or there may be other addresses whose hosts are
3669 specified in the transports, and therefore not visible at top level, in which
3670 case continue_more won't get set. */
3672 HDEBUG(D_transport|D_acl|D_v) debug_printf_indent(" SMTP(close)>>\n");
3675 shutdown(sx.cctx.sock, SHUT_WR);
3676 if (fcntl(sx.cctx.sock, F_SETFL, O_NONBLOCK) == 0)
3677 for (rc = 16; read(sx.cctx.sock, sx.inbuffer, sizeof(sx.inbuffer)) > 0 && rc > 0;)
3678 rc--; /* drain socket */
3680 (void)close(sx.cctx.sock);
3682 #ifndef DISABLE_EVENT
3683 (void) event_raise(tblock->event_action, US"tcp:close", NULL);
3686 continue_transport = NULL;
3687 continue_hostname = NULL;
3694 /*************************************************
3695 * Closedown entry point *
3696 *************************************************/
3698 /* This function is called when exim is passed an open smtp channel
3699 from another incarnation, but the message which it has been asked
3700 to deliver no longer exists. The channel is on stdin.
3702 We might do fancy things like looking for another message to send down
3703 the channel, but if the one we sought has gone, it has probably been
3704 delivered by some other process that itself will seek further messages,
3705 so just close down our connection.
3707 Argument: pointer to the transport instance block
3712 smtp_transport_closedown(transport_instance *tblock)
3714 smtp_transport_options_block *ob =
3715 (smtp_transport_options_block *)tblock->options_block;
3716 client_conn_ctx cctx;
3717 smtp_inblock inblock;
3718 smtp_outblock outblock;
3720 uschar inbuffer[4096];
3721 uschar outbuffer[16];
3723 /*XXX really we need an active-smtp-client ctx, rather than assuming stdout */
3724 cctx.sock = fileno(stdin);
3725 cctx.tls_ctx = cctx.sock == tls_out.active.sock ? tls_out.active.tls_ctx : NULL;
3727 inblock.cctx = &cctx;
3728 inblock.buffer = inbuffer;
3729 inblock.buffersize = sizeof(inbuffer);
3730 inblock.ptr = inbuffer;
3731 inblock.ptrend = inbuffer;
3733 outblock.cctx = &cctx;
3734 outblock.buffersize = sizeof(outbuffer);
3735 outblock.buffer = outbuffer;
3736 outblock.ptr = outbuffer;
3737 outblock.cmd_count = 0;
3738 outblock.authenticating = FALSE;
3740 (void)smtp_write_command(&outblock, SCMD_FLUSH, "QUIT\r\n");
3741 (void)smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
3742 ob->command_timeout);
3743 (void)close(cctx.sock);
3748 /*************************************************
3749 * Prepare addresses for delivery *
3750 *************************************************/
3752 /* This function is called to flush out error settings from previous delivery
3753 attempts to other hosts. It also records whether we got here via an MX record
3754 or not in the more_errno field of the address. We are interested only in
3755 addresses that are still marked DEFER - others may have got delivered to a
3756 previously considered IP address. Set their status to PENDING_DEFER to indicate
3757 which ones are relevant this time.
3760 addrlist the list of addresses
3761 host the host we are delivering to
3763 Returns: the first address for this delivery
3766 static address_item *
3767 prepare_addresses(address_item *addrlist, host_item *host)
3769 address_item *first_addr = NULL;
3771 for (addr = addrlist; addr; addr = addr->next)
3772 if (addr->transport_return == DEFER)
3774 if (!first_addr) first_addr = addr;
3775 addr->transport_return = PENDING_DEFER;
3776 addr->basic_errno = 0;
3777 addr->more_errno = (host->mx >= 0)? 'M' : 'A';
3778 addr->message = NULL;
3780 addr->cipher = NULL;
3781 addr->ourcert = NULL;
3782 addr->peercert = NULL;
3783 addr->peerdn = NULL;
3784 addr->ocsp = OCSP_NOT_REQ;
3786 #ifdef EXPERIMENTAL_DSN_INFO
3787 addr->smtp_greeting = NULL;
3788 addr->helo_response = NULL;
3796 /*************************************************
3797 * Main entry point *
3798 *************************************************/
3800 /* See local README for interface details. As this is a remote transport, it is
3801 given a chain of addresses to be delivered in one connection, if possible. It
3802 always returns TRUE, indicating that each address has its own independent
3803 status set, except if there is a setting up problem, in which case it returns
3807 smtp_transport_entry(
3808 transport_instance *tblock, /* data for this instantiation */
3809 address_item *addrlist) /* addresses we are working on */
3813 int hosts_defer = 0;
3815 int hosts_looked_up = 0;
3816 int hosts_retry = 0;
3817 int hosts_serial = 0;
3818 int hosts_total = 0;
3819 int total_hosts_tried = 0;
3821 BOOL expired = TRUE;
3822 uschar *expanded_hosts = NULL;
3824 uschar *tid = string_sprintf("%s transport", tblock->name);
3825 smtp_transport_options_block *ob =
3826 (smtp_transport_options_block *)(tblock->options_block);
3827 host_item *hostlist = addrlist->host_list;
3832 debug_printf("%s transport entered\n", tblock->name);
3833 for (addr = addrlist; addr; addr = addr->next)
3834 debug_printf(" %s\n", addr->address);
3837 debug_printf("hostlist:\n");
3838 for (host = hostlist; host; host = host->next)
3839 debug_printf(" '%s' IP %s port %d\n", host->name, host->address, host->port);
3841 if (continue_hostname)
3842 debug_printf("already connected to %s [%s] (on fd %d)\n",
3843 continue_hostname, continue_host_address,
3844 cutthrough.cctx.sock >= 0 ? cutthrough.cctx.sock : 0);
3847 /* Set the flag requesting that these hosts be added to the waiting
3848 database if the delivery fails temporarily or if we are running with
3849 queue_smtp or a 2-stage queue run. This gets unset for certain
3850 kinds of error, typically those that are specific to the message. */
3852 update_waiting = TRUE;
3854 /* If a host list is not defined for the addresses - they must all have the
3855 same one in order to be passed to a single transport - or if the transport has
3856 a host list with hosts_override set, use the host list supplied with the
3857 transport. It is an error for this not to exist. */
3859 if (!hostlist || (ob->hosts_override && ob->hosts))
3863 addrlist->message = string_sprintf("%s transport called with no hosts set",
3865 addrlist->transport_return = PANIC;
3866 return FALSE; /* Only top address has status */
3869 DEBUG(D_transport) debug_printf("using the transport's hosts: %s\n",
3872 /* If the transport's host list contains no '$' characters, and we are not
3873 randomizing, it is fixed and therefore a chain of hosts can be built once
3874 and for all, and remembered for subsequent use by other calls to this
3875 transport. If, on the other hand, the host list does contain '$', or we are
3876 randomizing its order, we have to rebuild it each time. In the fixed case,
3877 as the hosts string will never be used again, it doesn't matter that we
3878 replace all the : characters with zeros. */
3882 uschar *s = ob->hosts;
3884 if (Ustrchr(s, '$') != NULL)
3886 if (!(expanded_hosts = expand_string(s)))
3888 addrlist->message = string_sprintf("failed to expand list of hosts "
3889 "\"%s\" in %s transport: %s", s, tblock->name, expand_string_message);
3890 addrlist->transport_return = search_find_defer ? DEFER : PANIC;
3891 return FALSE; /* Only top address has status */
3893 DEBUG(D_transport) debug_printf("expanded list of hosts \"%s\" to "
3894 "\"%s\"\n", s, expanded_hosts);
3898 if (ob->hosts_randomize) s = expanded_hosts = string_copy(s);
3900 host_build_hostlist(&hostlist, s, ob->hosts_randomize);
3902 /* Check that the expansion yielded something useful. */
3906 string_sprintf("%s transport has empty hosts setting", tblock->name);
3907 addrlist->transport_return = PANIC;
3908 return FALSE; /* Only top address has status */
3911 /* If there was no expansion of hosts, save the host list for
3914 if (!expanded_hosts) ob->hostlist = hostlist;
3917 /* This is not the first time this transport has been run in this delivery;
3918 the host list was built previously. */
3921 hostlist = ob->hostlist;
3924 /* The host list was supplied with the address. If hosts_randomize is set, we
3925 must sort it into a random order if it did not come from MX records and has not
3926 already been randomized (but don't bother if continuing down an existing
3929 else if (ob->hosts_randomize && hostlist->mx == MX_NONE && !continue_hostname)
3931 host_item *newlist = NULL;
3934 host_item *h = hostlist;
3935 hostlist = hostlist->next;
3937 h->sort_key = random_number(100);
3944 else if (h->sort_key < newlist->sort_key)
3951 host_item *hh = newlist;
3954 if (h->sort_key < hh->next->sort_key) break;
3962 hostlist = addrlist->host_list = newlist;
3965 /* Sort out the default port. */
3967 if (!smtp_get_port(ob->port, addrlist, &defport, tid)) return FALSE;
3969 /* For each host-plus-IP-address on the list:
3971 . If this is a continued delivery and the host isn't the one with the
3972 current connection, skip.
3974 . If the status is unusable (i.e. previously failed or retry checked), skip.
3976 . If no IP address set, get the address, either by turning the name into
3977 an address, calling gethostbyname if gethostbyname is on, or by calling
3978 the DNS. The DNS may yield multiple addresses, in which case insert the
3979 extra ones into the list.
3981 . Get the retry data if not previously obtained for this address and set the
3982 field which remembers the state of this address. Skip if the retry time is
3983 not reached. If not, remember whether retry data was found. The retry string
3984 contains both the name and the IP address.
3986 . Scan the list of addresses and mark those whose status is DEFER as
3987 PENDING_DEFER. These are the only ones that will be processed in this cycle
3990 . Make a delivery attempt - addresses marked PENDING_DEFER will be tried.
3991 Some addresses may be successfully delivered, others may fail, and yet
3992 others may get temporary errors and so get marked DEFER.
3994 . The return from the delivery attempt is OK if a connection was made and a
3995 valid SMTP dialogue was completed. Otherwise it is DEFER.
3997 . If OK, add a "remove" retry item for this host/IPaddress, if any.
3999 . If fail to connect, or other defer state, add a retry item.
4001 . If there are any addresses whose status is still DEFER, carry on to the
4002 next host/IPaddress, unless we have tried the number of hosts given
4003 by hosts_max_try or hosts_max_try_hardlimit; otherwise return. Note that
4004 there is some fancy logic for hosts_max_try that means its limit can be
4005 overstepped in some circumstances.
4007 If we get to the end of the list, all hosts have deferred at least one address,
4008 or not reached their retry times. If delay_after_cutoff is unset, it requests a
4009 delivery attempt to those hosts whose last try was before the arrival time of
4010 the current message. To cope with this, we have to go round the loop a second
4011 time. After that, set the status and error data for any addresses that haven't
4012 had it set already. */
4014 for (cutoff_retry = 0;
4015 expired && cutoff_retry < (ob->delay_after_cutoff ? 1 : 2);
4018 host_item *nexthost = NULL;
4019 int unexpired_hosts_tried = 0;
4020 BOOL continue_host_tried = FALSE;
4022 retry_non_continued:
4023 for (host = hostlist;
4025 && unexpired_hosts_tried < ob->hosts_max_try
4026 && total_hosts_tried < ob->hosts_max_try_hardlimit;
4032 BOOL host_is_expired = FALSE;
4033 BOOL message_defer = FALSE;
4034 BOOL some_deferred = FALSE;
4035 address_item *first_addr = NULL;
4036 uschar *interface = NULL;
4037 uschar *retry_host_key = NULL;
4038 uschar *retry_message_key = NULL;
4039 uschar *serialize_key = NULL;
4041 /* Default next host is next host. :-) But this can vary if the
4042 hosts_max_try limit is hit (see below). It may also be reset if a host
4043 address is looked up here (in case the host was multihomed). */
4045 nexthost = host->next;
4047 /* If the address hasn't yet been obtained from the host name, look it up
4048 now, unless the host is already marked as unusable. If it is marked as
4049 unusable, it means that the router was unable to find its IP address (in
4050 the DNS or wherever) OR we are in the 2nd time round the cutoff loop, and
4051 the lookup failed last time. We don't get this far if *all* MX records
4052 point to non-existent hosts; that is treated as a hard error.
4054 We can just skip this host entirely. When the hosts came from the router,
4055 the address will timeout based on the other host(s); when the address is
4056 looked up below, there is an explicit retry record added.
4058 Note that we mustn't skip unusable hosts if the address is not unset; they
4059 may be needed as expired hosts on the 2nd time round the cutoff loop. */
4063 int new_port, flags;
4066 if (host->status >= hstatus_unusable)
4068 DEBUG(D_transport) debug_printf("%s has no address and is unusable - skipping\n",
4073 DEBUG(D_transport) debug_printf("getting address for %s\n", host->name);
4075 /* The host name is permitted to have an attached port. Find it, and
4076 strip it from the name. Just remember it for now. */
4078 new_port = host_item_get_port(host);
4080 /* Count hosts looked up */
4084 /* Find by name if so configured, or if it's an IP address. We don't
4085 just copy the IP address, because we need the test-for-local to happen. */
4087 flags = HOST_FIND_BY_A | HOST_FIND_BY_AAAA;
4088 if (ob->dns_qualify_single) flags |= HOST_FIND_QUALIFY_SINGLE;
4089 if (ob->dns_search_parents) flags |= HOST_FIND_SEARCH_PARENTS;
4091 if (ob->gethostbyname || string_is_ip_address(host->name, NULL) != 0)
4092 rc = host_find_byname(host, NULL, flags, NULL, TRUE);
4094 rc = host_find_bydns(host, NULL, flags, NULL, NULL, NULL,
4095 &ob->dnssec, /* domains for request/require */
4098 /* Update the host (and any additional blocks, resulting from
4099 multihoming) with a host-specific port, if any. */
4101 for (hh = host; hh != nexthost; hh = hh->next) hh->port = new_port;
4103 /* Failure to find the host at this time (usually DNS temporary failure)
4104 is really a kind of routing failure rather than a transport failure.
4105 Therefore we add a retry item of the routing kind, not to stop us trying
4106 to look this name up here again, but to ensure the address gets timed
4107 out if the failures go on long enough. A complete failure at this point
4108 commonly points to a configuration error, but the best action is still
4109 to carry on for the next host. */
4111 if (rc == HOST_FIND_AGAIN || rc == HOST_FIND_SECURITY || rc == HOST_FIND_FAILED)
4113 retry_add_item(addrlist, string_sprintf("R:%s", host->name), 0);
4115 if (rc == HOST_FIND_AGAIN) hosts_defer++; else hosts_fail++;
4116 DEBUG(D_transport) debug_printf("rc = %s for %s\n", (rc == HOST_FIND_AGAIN)?
4117 "HOST_FIND_AGAIN" : "HOST_FIND_FAILED", host->name);
4118 host->status = hstatus_unusable;
4120 for (addr = addrlist; addr; addr = addr->next)
4122 if (addr->transport_return != DEFER) continue;
4123 addr->basic_errno = ERRNO_UNKNOWNHOST;
4124 addr->message = string_sprintf(
4125 rc == HOST_FIND_SECURITY
4126 ? "lookup of IP address for %s was insecure"
4127 : "failed to lookup IP address for %s",
4133 /* If the host is actually the local host, we may have a problem, or
4134 there may be some cunning configuration going on. In the problem case,
4135 log things and give up. The default transport status is already DEFER. */
4137 if (rc == HOST_FOUND_LOCAL && !ob->allow_localhost)
4139 for (addr = addrlist; addr; addr = addr->next)
4141 addr->basic_errno = 0;
4142 addr->message = string_sprintf("%s transport found host %s to be "
4143 "local", tblock->name, host->name);
4147 } /* End of block for IP address lookup */
4149 /* If this is a continued delivery, we are interested only in the host
4150 which matches the name of the existing open channel. The check is put
4151 here after the local host lookup, in case the name gets expanded as a
4152 result of the lookup. Set expired FALSE, to save the outer loop executing
4155 if (continue_hostname)
4156 if ( Ustrcmp(continue_hostname, host->name) != 0
4157 || Ustrcmp(continue_host_address, host->address) != 0
4161 continue; /* With next host */
4164 continue_host_tried = TRUE;
4166 /* Reset the default next host in case a multihomed host whose addresses
4167 are not looked up till just above added to the host list. */
4169 nexthost = host->next;
4171 /* If queue_smtp is set (-odqs or the first part of a 2-stage run), or the
4172 domain is in queue_smtp_domains, we don't actually want to attempt any
4173 deliveries. When doing a queue run, queue_smtp_domains is always unset. If
4174 there is a lookup defer in queue_smtp_domains, proceed as if the domain
4175 were not in it. We don't want to hold up all SMTP deliveries! Except when
4176 doing a two-stage queue run, don't do this if forcing. */
4178 if ((!deliver_force || queue_2stage) && (queue_smtp ||
4179 match_isinlist(addrlist->domain,
4180 (const uschar **)&queue_smtp_domains, 0,
4181 &domainlist_anchor, NULL, MCL_DOMAIN, TRUE, NULL) == OK))
4184 for (addr = addrlist; addr; addr = addr->next)
4185 if (addr->transport_return == DEFER)
4186 addr->message = US"domain matches queue_smtp_domains, or -odqs set";
4187 continue; /* With next host */
4190 /* Count hosts being considered - purely for an intelligent comment
4191 if none are usable. */
4195 /* Set $host and $host address now in case they are needed for the
4196 interface expansion or the serialize_hosts check; they remain set if an
4197 actual delivery happens. */
4199 deliver_host = host->name;
4200 deliver_host_address = host->address;
4201 lookup_dnssec_authenticated = host->dnssec == DS_YES ? US"yes"
4202 : host->dnssec == DS_NO ? US"no"
4205 /* Set up a string for adding to the retry key if the port number is not
4206 the standard SMTP port. A host may have its own port setting that overrides
4209 pistring = string_sprintf(":%d", host->port == PORT_NONE
4210 ? defport : host->port);
4211 if (Ustrcmp(pistring, ":25") == 0) pistring = US"";
4213 /* Select IPv4 or IPv6, and choose an outgoing interface. If the interface
4214 string is set, even if constant (as different transports can have different
4215 constant settings), we must add it to the key that is used for retries,
4216 because connections to the same host from a different interface should be
4217 treated separately. */
4219 host_af = Ustrchr(host->address, ':') == NULL ? AF_INET : AF_INET6;
4220 if ((rs = ob->interface) && *rs)
4222 if (!smtp_get_interface(rs, host_af, addrlist, &interface, tid))
4224 pistring = string_sprintf("%s/%s", pistring, interface);
4227 /* The first time round the outer loop, check the status of the host by
4228 inspecting the retry data. The second time round, we are interested only
4229 in expired hosts that haven't been tried since this message arrived. */
4231 if (cutoff_retry == 0)
4234 /* Ensure the status of the address is set by checking retry data if
4235 necessary. There may be host-specific retry data (applicable to all
4236 messages) and also data for retries of a specific message at this host.
4237 If either of these retry records are actually read, the keys used are
4238 returned to save recomputing them later. */
4240 if (exp_bool(addrlist, US"transport", tblock->name, D_transport,
4241 US"retry_include_ip_address", ob->retry_include_ip_address,
4242 ob->expand_retry_include_ip_address, &incl_ip) != OK)
4243 continue; /* with next host */
4245 host_is_expired = retry_check_address(addrlist->domain, host, pistring,
4246 incl_ip, &retry_host_key, &retry_message_key);
4248 DEBUG(D_transport) debug_printf("%s [%s]%s retry-status = %s\n", host->name,
4249 (host->address == NULL)? US"" : host->address, pistring,
4250 (host->status == hstatus_usable)? "usable" :
4251 (host->status == hstatus_unusable)? "unusable" :
4252 (host->status == hstatus_unusable_expired)? "unusable (expired)" : "?");
4254 /* Skip this address if not usable at this time, noting if it wasn't
4255 actually expired, both locally and in the address. */
4257 switch (host->status)
4259 case hstatus_unusable:
4261 setflag(addrlist, af_retry_skipped);
4264 case hstatus_unusable_expired:
4267 case hwhy_retry: hosts_retry++; break;
4268 case hwhy_failed: hosts_fail++; break;
4270 case hwhy_deferred: hosts_defer++; break;
4273 /* If there was a retry message key, implying that previously there
4274 was a message-specific defer, we don't want to update the list of
4275 messages waiting for these hosts. */
4277 if (retry_message_key) update_waiting = FALSE;
4278 continue; /* With the next host or IP address */
4282 /* Second time round the loop: if the address is set but expired, and
4283 the message is newer than the last try, let it through. */
4288 || host->status != hstatus_unusable_expired
4289 || host->last_try > received_time.tv_sec)
4291 DEBUG(D_transport) debug_printf("trying expired host %s [%s]%s\n",
4292 host->name, host->address, pistring);
4293 host_is_expired = TRUE;
4296 /* Setting "expired=FALSE" doesn't actually mean not all hosts are expired;
4297 it remains TRUE only if all hosts are expired and none are actually tried.
4302 /* If this host is listed as one to which access must be serialized,
4303 see if another Exim process has a connection to it, and if so, skip
4304 this host. If not, update the database to record our connection to it
4305 and remember this for later deletion. Do not do any of this if we are
4306 sending the message down a pre-existing connection. */
4308 if ( !continue_hostname
4309 && verify_check_given_host(&ob->serialize_hosts, host) == OK)
4311 serialize_key = string_sprintf("host-serialize-%s", host->name);
4312 if (!enq_start(serialize_key, 1))
4315 debug_printf("skipping host %s because another Exim process "
4316 "is connected to it\n", host->name);
4322 /* OK, we have an IP address that is not waiting for its retry time to
4323 arrive (it might be expired) OR (second time round the loop) we have an
4324 expired host that hasn't been tried since the message arrived. Have a go
4325 at delivering the message to it. First prepare the addresses by flushing
4326 out the result of previous attempts, and finding the first address that
4327 is still to be delivered. */
4329 first_addr = prepare_addresses(addrlist, host);
4331 DEBUG(D_transport) debug_printf("delivering %s to %s [%s] (%s%s)\n",
4332 message_id, host->name, host->address, addrlist->address,
4333 addrlist->next ? ", ..." : "");
4335 set_process_info("delivering %s to %s [%s] (%s%s)",
4336 message_id, host->name, host->address, addrlist->address,
4337 addrlist->next ? ", ..." : "");
4339 /* This is not for real; don't do the delivery. If there are
4340 any remaining hosts, list them. */
4345 set_errno_nohost(addrlist, 0, NULL, OK, FALSE);
4346 for (addr = addrlist; addr; addr = addr->next)
4348 addr->host_used = host;
4349 addr->special_action = '*';
4350 addr->message = US"delivery bypassed by -N option";
4354 debug_printf("*** delivery by %s transport bypassed by -N option\n"
4355 "*** host and remaining hosts:\n", tblock->name);
4356 for (host2 = host; host2; host2 = host2->next)
4357 debug_printf(" %s [%s]\n", host2->name,
4358 host2->address ? host2->address : US"unset");
4363 /* This is for real. If the host is expired, we don't count it for
4364 hosts_max_retry. This ensures that all hosts must expire before an address
4365 is timed out, unless hosts_max_try_hardlimit (which protects against
4366 lunatic DNS configurations) is reached.
4368 If the host is not expired and we are about to hit the hosts_max_retry
4369 limit, check to see if there is a subsequent hosts with a different MX
4370 value. If so, make that the next host, and don't count this one. This is a
4371 heuristic to make sure that different MXs do get tried. With a normal kind
4372 of retry rule, they would get tried anyway when the earlier hosts were
4373 delayed, but if the domain has a "retry every time" type of rule - as is
4374 often used for the the very large ISPs, that won't happen. */
4379 /* Make a copy of the host if it is local to this invocation
4380 of the transport. */
4384 thost = store_get(sizeof(host_item));
4386 thost->name = string_copy(host->name);
4387 thost->address = string_copy(host->address);
4392 if (!host_is_expired && ++unexpired_hosts_tried >= ob->hosts_max_try)
4396 debug_printf("hosts_max_try limit reached with this host\n");
4397 for (h = host; h; h = h->next) if (h->mx != host->mx)
4400 unexpired_hosts_tried--;
4401 DEBUG(D_transport) debug_printf("however, a higher MX host exists "
4402 "and will be tried\n");
4407 /* Attempt the delivery. */
4409 total_hosts_tried++;
4410 rc = smtp_deliver(addrlist, thost, host_af, defport, interface, tblock,
4411 &message_defer, FALSE);
4414 OK => connection made, each address contains its result;
4415 message_defer is set for message-specific defers (when all
4416 recipients are marked defer)
4417 DEFER => there was a non-message-specific delivery problem;
4418 ERROR => there was a problem setting up the arguments for a filter,
4419 or there was a problem with expanding added headers
4422 /* If the result is not OK, there was a non-message-specific problem.
4423 If the result is DEFER, we need to write to the logs saying what happened
4424 for this particular host, except in the case of authentication and TLS
4425 failures, where the log has already been written. If all hosts defer a
4426 general message is written at the end. */
4428 if (rc == DEFER && first_addr->basic_errno != ERRNO_AUTHFAIL
4429 && first_addr->basic_errno != ERRNO_TLSFAILURE)
4430 write_logs(host, first_addr->message, first_addr->basic_errno);
4432 #ifndef DISABLE_EVENT
4434 deferred_event_raise(first_addr, host);
4437 /* If STARTTLS was accepted, but there was a failure in setting up the
4438 TLS session (usually a certificate screwup), and the host is not in
4439 hosts_require_tls, and tls_tempfail_tryclear is true, try again, with
4440 TLS forcibly turned off. We have to start from scratch with a new SMTP
4441 connection. That's why the retry is done from here, not from within
4442 smtp_deliver(). [Rejections of STARTTLS itself don't screw up the
4443 session, so the in-clear transmission after those errors, if permitted,
4444 happens inside smtp_deliver().] */
4448 && first_addr->basic_errno == ERRNO_TLSFAILURE
4449 && ob->tls_tempfail_tryclear
4450 && verify_check_given_host(&ob->hosts_require_tls, host) != OK
4453 log_write(0, LOG_MAIN,
4454 "%s: delivering unencrypted to H=%s [%s] (not in hosts_require_tls)",
4455 first_addr->message, host->name, host->address);
4456 first_addr = prepare_addresses(addrlist, host);
4457 rc = smtp_deliver(addrlist, thost, host_af, defport, interface, tblock,
4458 &message_defer, TRUE);
4459 if (rc == DEFER && first_addr->basic_errno != ERRNO_AUTHFAIL)
4460 write_logs(host, first_addr->message, first_addr->basic_errno);
4461 # ifndef DISABLE_EVENT
4463 deferred_event_raise(first_addr, host);
4466 #endif /*SUPPORT_TLS*/
4469 /* Delivery attempt finished */
4471 rs = rc == OK ? US"OK"
4472 : rc == DEFER ? US"DEFER"
4473 : rc == ERROR ? US"ERROR"
4476 set_process_info("delivering %s: just tried %s [%s] for %s%s: result %s",
4477 message_id, host->name, host->address, addrlist->address,
4478 addrlist->next ? " (& others)" : "", rs);
4480 /* Release serialization if set up */
4482 if (serialize_key) enq_end(serialize_key);
4484 /* If the result is DEFER, or if a host retry record is known to exist, we
4485 need to add an item to the retry chain for updating the retry database
4486 at the end of delivery. We only need to add the item to the top address,
4487 of course. Also, if DEFER, we mark the IP address unusable so as to skip it
4488 for any other delivery attempts using the same address. (It is copied into
4489 the unusable tree at the outer level, so even if different address blocks
4490 contain the same address, it still won't get tried again.) */
4492 if (rc == DEFER || retry_host_key)
4494 int delete_flag = rc != DEFER ? rf_delete : 0;
4495 if (!retry_host_key)
4498 if (exp_bool(addrlist, US"transport", tblock->name, D_transport,
4499 US"retry_include_ip_address", ob->retry_include_ip_address,
4500 ob->expand_retry_include_ip_address, &incl_ip) != OK)
4501 incl_ip = TRUE; /* error; use most-specific retry record */
4503 retry_host_key = incl_ip
4504 ? string_sprintf("T:%S:%s%s", host->name, host->address, pistring)
4505 : string_sprintf("T:%S%s", host->name, pistring);
4508 /* If a delivery of another message over an existing SMTP connection
4509 yields DEFER, we do NOT set up retry data for the host. This covers the
4510 case when there are delays in routing the addresses in the second message
4511 that are so long that the server times out. This is alleviated by not
4512 routing addresses that previously had routing defers when handling an
4513 existing connection, but even so, this case may occur (e.g. if a
4514 previously happily routed address starts giving routing defers). If the
4515 host is genuinely down, another non-continued message delivery will
4516 notice it soon enough. */
4518 if (delete_flag != 0 || !continue_hostname)
4519 retry_add_item(first_addr, retry_host_key, rf_host | delete_flag);
4521 /* We may have tried an expired host, if its retry time has come; ensure
4522 the status reflects the expiry for the benefit of any other addresses. */
4526 host->status = host_is_expired
4527 ? hstatus_unusable_expired : hstatus_unusable;
4528 host->why = hwhy_deferred;
4532 /* If message_defer is set (host was OK, but every recipient got deferred
4533 because of some message-specific problem), or if that had happened
4534 previously so that a message retry key exists, add an appropriate item
4535 to the retry chain. Note that if there was a message defer but now there is
4536 a host defer, the message defer record gets deleted. That seems perfectly
4537 reasonable. Also, stop the message from being remembered as waiting
4538 for specific hosts. */
4540 if (message_defer || retry_message_key)
4542 int delete_flag = message_defer ? 0 : rf_delete;
4543 if (!retry_message_key)
4546 if (exp_bool(addrlist, US"transport", tblock->name, D_transport,
4547 US"retry_include_ip_address", ob->retry_include_ip_address,
4548 ob->expand_retry_include_ip_address, &incl_ip) != OK)
4549 incl_ip = TRUE; /* error; use most-specific retry record */
4551 retry_message_key = incl_ip
4552 ? string_sprintf("T:%S:%s%s:%s", host->name, host->address, pistring,
4554 : string_sprintf("T:%S%s:%s", host->name, pistring, message_id);
4556 retry_add_item(addrlist, retry_message_key,
4557 rf_message | rf_host | delete_flag);
4558 update_waiting = FALSE;
4561 /* Any return other than DEFER (that is, OK or ERROR) means that the
4562 addresses have got their final statuses filled in for this host. In the OK
4563 case, see if any of them are deferred. */
4566 for (addr = addrlist; addr; addr = addr->next)
4567 if (addr->transport_return == DEFER)
4569 some_deferred = TRUE;
4573 /* If no addresses deferred or the result was ERROR, return. We do this for
4574 ERROR because a failing filter set-up or add_headers expansion is likely to
4575 fail for any host we try. */
4577 if (rc == ERROR || (rc == OK && !some_deferred))
4579 DEBUG(D_transport) debug_printf("Leaving %s transport\n", tblock->name);
4580 return TRUE; /* Each address has its status */
4583 /* If the result was DEFER or some individual addresses deferred, let
4584 the loop run to try other hosts with the deferred addresses, except for the
4585 case when we were trying to deliver down an existing channel and failed.
4586 Don't try any other hosts in this case. */
4588 if (continue_hostname) break;
4590 /* If the whole delivery, or some individual addresses, were deferred and
4591 there are more hosts that could be tried, do not count this host towards
4592 the hosts_max_try limit if the age of the message is greater than the
4593 maximum retry time for this host. This means we may try try all hosts,
4594 ignoring the limit, when messages have been around for some time. This is
4595 important because if we don't try all hosts, the address will never time
4596 out. NOTE: this does not apply to hosts_max_try_hardlimit. */
4598 if ((rc == DEFER || some_deferred) && nexthost)
4601 retry_config *retry = retry_find_config(host->name, NULL, 0, 0);
4603 if (retry && retry->rules)
4605 retry_rule *last_rule;
4606 for (last_rule = retry->rules;
4608 last_rule = last_rule->next);
4609 timedout = time(NULL) - received_time.tv_sec > last_rule->timeout;
4611 else timedout = TRUE; /* No rule => timed out */
4615 unexpired_hosts_tried--;
4616 DEBUG(D_transport) debug_printf("temporary delivery error(s) override "
4617 "hosts_max_try (message older than host's retry time)\n");
4620 } /* End of loop for trying multiple hosts. */
4622 /* If we failed to find a matching host in the list, for an already-open
4623 connection, just close it and start over with the list. This can happen
4624 for routing that changes from run to run, or big multi-IP sites with
4627 if (continue_hostname && !continue_host_tried)
4629 int fd = cutthrough.cctx.sock >= 0 ? cutthrough.cctx.sock : 0;
4631 DEBUG(D_transport) debug_printf("no hosts match already-open connection\n");
4633 /* A TLS conn could be open for a cutthrough, but not for a plain continued-
4635 /*XXX doublecheck that! */
4637 if (cutthrough.cctx.sock >= 0 && cutthrough.is_tls)
4639 (void) tls_write(cutthrough.cctx.tls_ctx, US"QUIT\r\n", 6, FALSE);
4640 tls_close(cutthrough.cctx.tls_ctx, TLS_SHUTDOWN_NOWAIT);
4641 cutthrough.cctx.tls_ctx = NULL;
4642 cutthrough.is_tls = FALSE;
4646 (void) write(fd, US"QUIT\r\n", 6);
4649 cutthrough.cctx.sock = -1;
4650 continue_hostname = NULL;
4651 goto retry_non_continued;
4654 /* This is the end of the loop that repeats iff expired is TRUE and
4655 ob->delay_after_cutoff is FALSE. The second time round we will
4656 try those hosts that haven't been tried since the message arrived. */
4660 debug_printf("all IP addresses skipped or deferred at least one address\n");
4661 if (expired && !ob->delay_after_cutoff && cutoff_retry == 0)
4662 debug_printf("retrying IP addresses not tried since message arrived\n");
4667 /* Get here if all IP addresses are skipped or defer at least one address. In
4668 MUA wrapper mode, this will happen only for connection or other non-message-
4669 specific failures. Force the delivery status for all addresses to FAIL. */
4673 for (addr = addrlist; addr; addr = addr->next)
4674 addr->transport_return = FAIL;
4678 /* In the normal, non-wrapper case, add a standard message to each deferred
4679 address if there hasn't been an error, that is, if it hasn't actually been
4680 tried this time. The variable "expired" will be FALSE if any deliveries were
4681 actually tried, or if there was at least one host that was not expired. That
4682 is, it is TRUE only if no deliveries were tried and all hosts were expired. If
4683 a delivery has been tried, an error code will be set, and the failing of the
4684 message is handled by the retry code later.
4686 If queue_smtp is set, or this transport was called to send a subsequent message
4687 down an existing TCP/IP connection, and something caused the host not to be
4688 found, we end up here, but can detect these cases and handle them specially. */
4690 for (addr = addrlist; addr; addr = addr->next)
4692 /* If host is not NULL, it means that we stopped processing the host list
4693 because of hosts_max_try or hosts_max_try_hardlimit. In the former case, this
4694 means we need to behave as if some hosts were skipped because their retry
4695 time had not come. Specifically, this prevents the address from timing out.
4696 However, if we have hit hosts_max_try_hardlimit, we want to behave as if all
4697 hosts were tried. */
4700 if (total_hosts_tried >= ob->hosts_max_try_hardlimit)
4703 debug_printf("hosts_max_try_hardlimit reached: behave as if all "
4704 "hosts were tried\n");
4709 debug_printf("hosts_max_try limit caused some hosts to be skipped\n");
4710 setflag(addr, af_retry_skipped);
4713 if (queue_smtp) /* no deliveries attempted */
4715 addr->transport_return = DEFER;
4716 addr->basic_errno = 0;
4717 addr->message = US"SMTP delivery explicitly queued";
4720 else if ( addr->transport_return == DEFER
4721 && (addr->basic_errno == ERRNO_UNKNOWNERROR || addr->basic_errno == 0)
4725 addr->basic_errno = ERRNO_HRETRY;
4726 if (continue_hostname)
4727 addr->message = US"no host found for existing SMTP connection";
4730 setflag(addr, af_pass_message); /* This is not a security risk */
4731 addr->message = string_sprintf(
4732 "all hosts%s have been failing for a long time %s",
4733 addr->domain ? string_sprintf(" for '%s'", addr->domain) : US"",
4734 ob->delay_after_cutoff
4735 ? US"(and retry time not reached)"
4736 : US"and were last tried after this message arrived");
4738 /* If we are already using fallback hosts, or there are no fallback hosts
4739 defined, convert the result to FAIL to cause a bounce. */
4741 if (addr->host_list == addr->fallback_hosts || !addr->fallback_hosts)
4742 addr->transport_return = FAIL;
4747 if (hosts_retry == hosts_total)
4748 s = "retry time not reached for any host%s";
4749 else if (hosts_fail == hosts_total)
4750 s = "all host address lookups%s failed permanently";
4751 else if (hosts_defer == hosts_total)
4752 s = "all host address lookups%s failed temporarily";
4753 else if (hosts_serial == hosts_total)
4754 s = "connection limit reached for all hosts%s";
4755 else if (hosts_fail+hosts_defer == hosts_total)
4756 s = "all host address lookups%s failed";
4758 s = "some host address lookups failed and retry time "
4759 "not reached for other hosts or connection limit reached%s";
4761 addr->message = string_sprintf(s,
4762 addr->domain ? string_sprintf(" for '%s'", addr->domain) : US"");
4767 /* Update the database which keeps information about which messages are waiting
4768 for which hosts to become available. For some message-specific errors, the
4769 update_waiting flag is turned off because we don't want follow-on deliveries in
4770 those cases. If this transport instance is explicitly limited to one message
4771 per connection then follow-on deliveries are not possible and there's no need
4772 to create/update the per-transport wait-<transport_name> database. */
4774 if (update_waiting && tblock->connection_max_messages != 1)
4775 transport_update_waiting(hostlist, tblock->name);
4779 DEBUG(D_transport) debug_printf("Leaving %s transport\n", tblock->name);
4781 return TRUE; /* Each address has its status */
4784 #endif /*!MACRO_PREDEF*/
4787 /* End of transport/smtp.c */