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 */
1649 sx->inblock.sock = sx->outblock.sock =
1650 smtp_connect(sx->host, sx->host_af, sx->interface,
1651 sx->ob->connect_timeout, sx->tblock);
1653 if (sx->inblock.sock < 0)
1655 uschar * msg = NULL;
1658 msg = US strerror(errno);
1659 HDEBUG(D_verify) debug_printf("connect: %s\n", msg);
1661 set_errno_nohost(sx->addrlist,
1662 errno == ETIMEDOUT ? ERRNO_CONNECTTIMEOUT : errno,
1663 sx->verify ? string_sprintf("could not connect: %s", msg)
1666 sx->send_quit = FALSE;
1670 /* Expand the greeting message while waiting for the initial response. (Makes
1671 sense if helo_data contains ${lookup dnsdb ...} stuff). The expansion is
1672 delayed till here so that $sending_interface and $sending_port are set. */
1675 if (!(sx->helo_data = expand_string(sx->helo_data)))
1677 log_write(0, LOG_MAIN|LOG_PANIC,
1678 "<%s>: failed to expand transport's helo_data value for callout: %s",
1679 sx->addrlist->address, expand_string_message);
1684 expand_string_message = NULL;
1685 if ((sx->helo_data = string_domain_utf8_to_alabel(sx->helo_data,
1686 &expand_string_message)),
1687 expand_string_message)
1689 log_write(0, LOG_MAIN|LOG_PANIC,
1690 "<%s>: failed to expand transport's helo_data value for callout: %s",
1691 sx->addrlist->address, expand_string_message);
1693 sx->helo_data = NULL;
1697 /* The first thing is to wait for an initial OK response. The dreaded "goto"
1698 is nevertheless a reasonably clean way of programming this kind of logic,
1699 where you want to escape on any error. */
1706 (void) setsockopt(sx->inblock.sock, IPPROTO_TCP, TCP_QUICKACK, US &off, sizeof(off));
1708 good_response = smtp_read_response(&sx->inblock, sx->buffer, sizeof(sx->buffer),
1709 '2', sx->ob->command_timeout);
1710 #ifdef EXPERIMENTAL_DSN_INFO
1711 sx->smtp_greeting = string_copy(sx->buffer);
1713 if (!good_response) goto RESPONSE_FAILED;
1715 #ifndef DISABLE_EVENT
1718 lookup_dnssec_authenticated = sx->host->dnssec==DS_YES ? US"yes"
1719 : sx->host->dnssec==DS_NO ? US"no" : NULL;
1720 s = event_raise(sx->tblock->event_action, US"smtp:connect", sx->buffer);
1723 set_errno_nohost(sx->addrlist, ERRNO_EXPANDFAIL,
1724 string_sprintf("deferred by smtp:connect event expansion: %s", s),
1732 /* Now check if the helo_data expansion went well, and sign off cleanly if
1737 message = string_sprintf("failed to expand helo_data: %s",
1738 expand_string_message);
1739 set_errno_nohost(sx->addrlist, ERRNO_EXPANDFAIL, message, DEFER, FALSE);
1745 /** Debugging without sending a message
1746 sx->addrlist->transport_return = DEFER;
1750 /* Errors that occur after this point follow an SMTP command, which is
1751 left in big_buffer by smtp_write_command() for use in error messages. */
1753 smtp_command = big_buffer;
1755 /* Tell the remote who we are...
1757 February 1998: A convention has evolved that ESMTP-speaking MTAs include the
1758 string "ESMTP" in their greeting lines, so make Exim send EHLO if the
1759 greeting is of this form. The assumption was that the far end supports it
1760 properly... but experience shows that there are some that give 5xx responses,
1761 even though the banner includes "ESMTP" (there's a bloody-minded one that
1762 says "ESMTP not spoken here"). Cope with that case.
1764 September 2000: Time has passed, and it seems reasonable now to always send
1765 EHLO at the start. It is also convenient to make the change while installing
1768 July 2003: Joachim Wieland met a broken server that advertises "PIPELINING"
1769 but times out after sending MAIL FROM, RCPT TO and DATA all together. There
1770 would be no way to send out the mails, so there is now a host list
1771 "hosts_avoid_esmtp" that disables ESMTP for special hosts and solves the
1772 PIPELINING problem as well. Maybe it can also be useful to cure other
1773 problems with broken servers.
1775 Exim originally sent "Helo" at this point and ran for nearly a year that way.
1776 Then somebody tried it with a Microsoft mailer... It seems that all other
1777 mailers use upper case for some reason (the RFC is quite clear about case
1778 independence) so, for peace of mind, I gave in. */
1780 sx->esmtp = verify_check_given_host(&sx->ob->hosts_avoid_esmtp, sx->host) != OK;
1782 /* Alas; be careful, since this goto is not an error-out, so conceivably
1783 we might set data between here and the target which we assume to exist
1784 and be usable. I can see this coming back to bite us. */
1788 smtp_peer_options |= OPTION_TLS;
1789 suppress_tls = FALSE;
1790 sx->ob->tls_tempfail_tryclear = FALSE;
1791 smtp_command = US"SSL-on-connect";
1798 if (smtp_write_command(&sx->outblock, SCMD_FLUSH, "%s %s\r\n",
1799 sx->lmtp ? "LHLO" : "EHLO", sx->helo_data) < 0)
1801 sx->esmtp_sent = TRUE;
1802 if (!smtp_read_response(&sx->inblock, sx->buffer, sizeof(sx->buffer), '2',
1803 sx->ob->command_timeout))
1805 if (errno != 0 || sx->buffer[0] == 0 || sx->lmtp)
1807 #ifdef EXPERIMENTAL_DSN_INFO
1808 sx->helo_response = string_copy(sx->buffer);
1810 goto RESPONSE_FAILED;
1814 #ifdef EXPERIMENTAL_DSN_INFO
1815 sx->helo_response = string_copy(sx->buffer);
1820 debug_printf("not sending EHLO (host matches hosts_avoid_esmtp)\n");
1825 int n = sizeof(sx->buffer);
1826 uschar * rsp = sx->buffer;
1828 if (sx->esmtp_sent && (n = Ustrlen(sx->buffer)) < sizeof(sx->buffer)/2)
1829 { rsp = sx->buffer + n + 1; n = sizeof(sx->buffer) - n; }
1831 if (smtp_write_command(&sx->outblock, SCMD_FLUSH, "HELO %s\r\n", sx->helo_data) < 0)
1833 good_response = smtp_read_response(&sx->inblock, rsp, n,
1834 '2', sx->ob->command_timeout);
1835 #ifdef EXPERIMENTAL_DSN_INFO
1836 sx->helo_response = string_copy(rsp);
1840 /* Handle special logging for a closed connection after HELO
1841 when had previously sent EHLO */
1843 if (rsp != sx->buffer && rsp[0] == 0 && (errno == 0 || errno == ECONNRESET))
1845 errno = ERRNO_SMTPCLOSED;
1846 goto EHLOHELO_FAILED;
1848 memmove(sx->buffer, rsp, Ustrlen(rsp));
1849 goto RESPONSE_FAILED;
1853 sx->avoid_option = sx->peer_offered = smtp_peer_options = 0;
1855 if (sx->esmtp || sx->lmtp)
1857 sx->peer_offered = ehlo_response(sx->buffer,
1858 OPTION_TLS /* others checked later */
1861 /* Set tls_offered if the response to EHLO specifies support for STARTTLS. */
1864 smtp_peer_options |= sx->peer_offered & OPTION_TLS;
1869 /* For continuing deliveries down the same channel, having re-exec'd the socket
1870 is the standard input; for a socket held open from verify it is recorded
1871 in the cutthrough context block. Either way we don't need to redo EHLO here
1872 (but may need to do so for TLS - see below).
1873 Set up the pointer to where subsequent commands will be left, for
1874 error messages. Note that smtp_peer_options will have been
1875 set from the command line if they were set in the process that passed the
1878 /*XXX continue case needs to propagate DSN_INFO, prob. in deliver.c
1879 as the continue goes via transport_pass_socket() and doublefork and exec.
1880 It does not wait. Unclear how we keep separate host's responses
1881 separate - we could match up by host ip+port as a bodge. */
1885 if (cutthrough.fd >= 0 && cutthrough.callout_hold_only)
1887 sx->inblock.sock = sx->outblock.sock = cutthrough.fd;
1888 sx->host->port = sx->port = cutthrough.host.port;
1892 sx->inblock.sock = sx->outblock.sock = 0; /* stdin */
1893 smtp_port_for_connect(sx->host, sx->port); /* Record the port that was used */
1895 smtp_command = big_buffer;
1896 sx->helo_data = NULL; /* ensure we re-expand ob->helo_data */
1898 /* For a continued connection with TLS being proxied for us, or a
1899 held-open verify connection with TLS, nothing more to do. */
1901 if ( continue_proxy_cipher
1902 || (cutthrough.fd >= 0 && cutthrough.callout_hold_only && cutthrough.is_tls)
1905 sx->peer_offered = smtp_peer_options;
1906 pipelining_active = !!(smtp_peer_options & OPTION_PIPE);
1907 HDEBUG(D_transport) debug_printf("continued connection, %s TLS\n",
1908 continue_proxy_cipher ? "proxied" : "verify conn with");
1911 HDEBUG(D_transport) debug_printf("continued connection, no TLS\n");
1914 /* If TLS is available on this connection, whether continued or not, attempt to
1915 start up a TLS session, unless the host is in hosts_avoid_tls. If successful,
1916 send another EHLO - the server may give a different answer in secure mode. We
1917 use a separate buffer for reading the response to STARTTLS so that if it is
1918 negative, the original EHLO data is available for subsequent analysis, should
1919 the client not be required to use TLS. If the response is bad, copy the buffer
1920 for error analysis. */
1923 if ( smtp_peer_options & OPTION_TLS
1925 && verify_check_given_host(&sx->ob->hosts_avoid_tls, sx->host) != OK
1927 || verify_check_given_host(&sx->ob->hosts_verify_avoid_tls, sx->host) != OK
1930 uschar buffer2[4096];
1931 if (smtp_write_command(&sx->outblock, SCMD_FLUSH, "STARTTLS\r\n") < 0)
1934 /* If there is an I/O error, transmission of this message is deferred. If
1935 there is a temporary rejection of STARRTLS and tls_tempfail_tryclear is
1936 false, we also defer. However, if there is a temporary rejection of STARTTLS
1937 and tls_tempfail_tryclear is true, or if there is an outright rejection of
1938 STARTTLS, we carry on. This means we will try to send the message in clear,
1939 unless the host is in hosts_require_tls (tested below). */
1941 if (!smtp_read_response(&sx->inblock, buffer2, sizeof(buffer2), '2',
1942 sx->ob->command_timeout))
1946 || (buffer2[0] == '4' && !sx->ob->tls_tempfail_tryclear)
1949 Ustrncpy(sx->buffer, buffer2, sizeof(sx->buffer));
1950 sx->buffer[sizeof(sx->buffer)-1] = '\0';
1951 goto RESPONSE_FAILED;
1955 /* STARTTLS accepted: try to negotiate a TLS session. */
1960 address_item * addr;
1962 int rc = tls_client_start(sx->inblock.sock, sx->host, sx->addrlist, sx->tblock,
1963 # ifdef SUPPORT_DANE
1964 sx->dane ? &tlsa_dnsa : NULL,
1968 /* TLS negotiation failed; give an error. From outside, this function may
1969 be called again to try in clear on a new connection, if the options permit
1970 it for this host. */
1974 # ifdef SUPPORT_DANE
1977 log_write(0, LOG_MAIN,
1978 "DANE attempt failed; TLS connection to %s [%s]: %s",
1979 sx->host->name, sx->host->address, errstr);
1980 (void) event_raise(sx->tblock->event_action,
1981 US"dane:fail", US"validation-failure"); /* could do with better detail */
1985 errno = ERRNO_TLSFAILURE;
1986 message = string_sprintf("TLS session: %s", errstr);
1987 sx->send_quit = FALSE;
1991 /* TLS session is set up */
1993 smtp_peer_options_wrap = smtp_peer_options;
1994 for (addr = sx->addrlist; addr; addr = addr->next)
1995 if (addr->transport_return == PENDING_DEFER)
1997 addr->cipher = tls_out.cipher;
1998 addr->ourcert = tls_out.ourcert;
1999 addr->peercert = tls_out.peercert;
2000 addr->peerdn = tls_out.peerdn;
2001 addr->ocsp = tls_out.ocsp;
2006 /* if smtps, we'll have smtp_command set to something else; always safe to
2008 smtp_command = big_buffer;
2010 /* If we started TLS, redo the EHLO/LHLO exchange over the secure channel. If
2011 helo_data is null, we are dealing with a connection that was passed from
2012 another process, and so we won't have expanded helo_data above. We have to
2013 expand it here. $sending_ip_address and $sending_port are set up right at the
2014 start of the Exim process (in exim.c). */
2016 if (tls_out.active >= 0)
2021 if (!sx->helo_data && !(sx->helo_data = expand_string(sx->ob->helo_data)))
2023 uschar *message = string_sprintf("failed to expand helo_data: %s",
2024 expand_string_message);
2025 set_errno_nohost(sx->addrlist, ERRNO_EXPANDFAIL, message, DEFER, FALSE);
2030 /* For SMTPS we need to wait for the initial OK response. */
2033 good_response = smtp_read_response(&sx->inblock, sx->buffer, sizeof(sx->buffer),
2034 '2', sx->ob->command_timeout);
2035 #ifdef EXPERIMENTAL_DSN_INFO
2036 sx->smtp_greeting = string_copy(sx->buffer);
2038 if (!good_response) goto RESPONSE_FAILED;
2042 greeting_cmd = "EHLO";
2045 greeting_cmd = "HELO";
2047 debug_printf("not sending EHLO (host matches hosts_avoid_esmtp)\n");
2050 if (smtp_write_command(&sx->outblock, SCMD_FLUSH, "%s %s\r\n",
2051 sx->lmtp ? "LHLO" : greeting_cmd, sx->helo_data) < 0)
2053 good_response = smtp_read_response(&sx->inblock, sx->buffer, sizeof(sx->buffer),
2054 '2', sx->ob->command_timeout);
2055 #ifdef EXPERIMENTAL_DSN_INFO
2056 sx->helo_response = string_copy(sx->buffer);
2058 if (!good_response) goto RESPONSE_FAILED;
2059 smtp_peer_options = 0;
2062 /* If the host is required to use a secure channel, ensure that we
2066 # ifdef SUPPORT_DANE
2069 || verify_check_given_host(&sx->ob->hosts_require_tls, sx->host) == OK
2072 errno = ERRNO_TLSREQUIRED;
2073 message = string_sprintf("a TLS session is required, but %s",
2074 smtp_peer_options & OPTION_TLS
2075 ? "an attempt to start TLS failed" : "the server did not offer TLS support");
2076 # ifdef SUPPORT_DANE
2078 (void) event_raise(sx->tblock->event_action, US"dane:fail",
2079 smtp_peer_options & OPTION_TLS
2080 ? US"validation-failure" /* could do with better detail */
2081 : US"starttls-not-supported");
2085 #endif /*SUPPORT_TLS*/
2087 /* If TLS is active, we have just started it up and re-done the EHLO command,
2088 so its response needs to be analyzed. If TLS is not active and this is a
2089 continued session down a previously-used socket, we haven't just done EHLO, so
2092 if (continue_hostname == NULL
2094 || tls_out.active >= 0
2098 if (sx->esmtp || sx->lmtp)
2100 sx->peer_offered = ehlo_response(sx->buffer,
2102 | (sx->lmtp && sx->ob->lmtp_ignore_quota ? OPTION_IGNQ : 0)
2106 | (sx->addrlist->prop.utf8_msg ? OPTION_UTF8 : 0)
2107 /*XXX if we hand peercaps on to continued-conn processes,
2108 must not depend on this addr */
2112 | (sx->ob->size_addition >= 0 ? OPTION_SIZE : 0)
2115 /* Set for IGNOREQUOTA if the response to LHLO specifies support and the
2116 lmtp_ignore_quota option was set. */
2118 sx->igquotstr = sx->peer_offered & OPTION_IGNQ ? US" IGNOREQUOTA" : US"";
2120 /* If the response to EHLO specified support for the SIZE parameter, note
2121 this, provided size_addition is non-negative. */
2123 smtp_peer_options |= sx->peer_offered & OPTION_SIZE;
2125 /* Note whether the server supports PIPELINING. If hosts_avoid_esmtp matched
2126 the current host, esmtp will be false, so PIPELINING can never be used. If
2127 the current host matches hosts_avoid_pipelining, don't do it. */
2129 if ( sx->peer_offered & OPTION_PIPE
2130 && verify_check_given_host(&sx->ob->hosts_avoid_pipelining, sx->host) != OK)
2131 smtp_peer_options |= OPTION_PIPE;
2133 DEBUG(D_transport) debug_printf("%susing PIPELINING\n",
2134 smtp_peer_options & OPTION_PIPE ? "" : "not ");
2136 if ( sx->peer_offered & OPTION_CHUNKING
2137 && verify_check_given_host(&sx->ob->hosts_try_chunking, sx->host) != OK)
2138 sx->peer_offered &= ~OPTION_CHUNKING;
2140 if (sx->peer_offered & OPTION_CHUNKING)
2141 {DEBUG(D_transport) debug_printf("CHUNKING usable\n");}
2143 #ifndef DISABLE_PRDR
2144 if ( sx->peer_offered & OPTION_PRDR
2145 && verify_check_given_host(&sx->ob->hosts_try_prdr, sx->host) != OK)
2146 sx->peer_offered &= ~OPTION_PRDR;
2148 if (sx->peer_offered & OPTION_PRDR)
2149 {DEBUG(D_transport) debug_printf("PRDR usable\n");}
2152 /* Note if the server supports DSN */
2153 smtp_peer_options |= sx->peer_offered & OPTION_DSN;
2154 DEBUG(D_transport) debug_printf("%susing DSN\n",
2155 sx->peer_offered & OPTION_DSN ? "" : "not ");
2157 /* Note if the response to EHLO specifies support for the AUTH extension.
2158 If it has, check that this host is one we want to authenticate to, and do
2159 the business. The host name and address must be available when the
2160 authenticator's client driver is running. */
2162 switch (yield = smtp_auth(sx->buffer, sizeof(sx->buffer), sx->addrlist, sx->host,
2163 sx->ob, sx->esmtp, &sx->inblock, &sx->outblock))
2165 default: goto SEND_QUIT;
2167 case FAIL_SEND: goto SEND_FAILED;
2168 case FAIL: goto RESPONSE_FAILED;
2172 pipelining_active = !!(smtp_peer_options & OPTION_PIPE);
2174 /* The setting up of the SMTP call is now complete. Any subsequent errors are
2175 message-specific. */
2177 sx->setting_up = FALSE;
2180 if (sx->addrlist->prop.utf8_msg)
2182 sx->utf8_needed = !sx->addrlist->prop.utf8_downcvt
2183 && !sx->addrlist->prop.utf8_downcvt_maybe;
2184 DEBUG(D_transport) if (!sx->utf8_needed)
2185 debug_printf("utf8: %s downconvert\n",
2186 sx->addrlist->prop.utf8_downcvt ? "mandatory" : "optional");
2189 /* If this is an international message we need the host to speak SMTPUTF8 */
2190 if (sx->utf8_needed && !(sx->peer_offered & OPTION_UTF8))
2192 errno = ERRNO_UTF8_FWD;
2193 goto RESPONSE_FAILED;
2205 sx->send_quit = check_response(sx->host, &errno, sx->addrlist->more_errno,
2206 sx->buffer, &code, &message, &pass_message);
2211 message = US string_sprintf("send() to %s [%s] failed: %s",
2212 sx->host->name, sx->host->address, strerror(errno));
2213 sx->send_quit = FALSE;
2218 message = string_sprintf("Remote host closed connection in response to %s"
2219 " (EHLO response was: %s)", smtp_command, sx->buffer);
2220 sx->send_quit = FALSE;
2223 /* This label is jumped to directly when a TLS negotiation has failed,
2224 or was not done for a host for which it is required. Values will be set
2225 in message and errno, and setting_up will always be true. Treat as
2226 a temporary error. */
2234 /* The failure happened while setting up the call; see if the failure was
2235 a 5xx response (this will either be on connection, or following HELO - a 5xx
2236 after EHLO causes it to try HELO). If so, and there are no more hosts to try,
2237 fail all addresses, as this host is never going to accept them. For other
2238 errors during setting up (timeouts or whatever), defer all addresses, and
2239 yield DEFER, so that the host is not tried again for a while.
2241 XXX This peeking for another host feels like a layering violation. We want
2242 to note the host as unusable, but down here we shouldn't know if this was
2243 the last host to try for the addr(list). Perhaps the upper layer should be
2244 the one to do set_errno() ? The problem is that currently the addr is where
2245 errno etc. are stashed, but until we run out of hosts to try the errors are
2246 host-specific. Maybe we should enhance the host_item definition? */
2249 sx->ok = FALSE; /* For when reached by GOTO */
2250 set_errno(sx->addrlist, errno, message,
2255 || errno == ERRNO_UTF8_FWD
2258 pass_message, sx->host
2259 #ifdef EXPERIMENTAL_DSN_INFO
2260 , sx->smtp_greeting, sx->helo_response
2270 (void)smtp_write_command(&sx->outblock, SCMD_FLUSH, "QUIT\r\n");
2273 tls_close(FALSE, TLS_SHUTDOWN_NOWAIT);
2276 /* Close the socket, and return the appropriate value, first setting
2277 works because the NULL setting is passed back to the calling process, and
2278 remote_max_parallel is forced to 1 when delivering over an existing connection,
2281 HDEBUG(D_transport|D_acl|D_v) debug_printf_indent(" SMTP(close)>>\n");
2284 shutdown(sx->outblock.sock, SHUT_WR);
2285 if (fcntl(sx->inblock.sock, F_SETFL, O_NONBLOCK) == 0)
2286 for (rc = 16; read(sx->inblock.sock, sx->inbuffer, sizeof(sx->inbuffer)) > 0 && rc > 0;)
2287 rc--; /* drain socket */
2288 sx->send_quit = FALSE;
2290 (void)close(sx->inblock.sock);
2291 sx->inblock.sock = sx->outblock.sock = -1;
2293 #ifndef DISABLE_EVENT
2294 (void) event_raise(sx->tblock->event_action, US"tcp:close", NULL);
2297 continue_transport = NULL;
2298 continue_hostname = NULL;
2305 /* Create the string of options that will be appended to the MAIL FROM:
2306 in the connection context buffer */
2309 build_mailcmd_options(smtp_context * sx, address_item * addrlist)
2311 uschar * p = sx->buffer;
2312 address_item * addr;
2317 /* If we know the receiving MTA supports the SIZE qualification, and we know it,
2318 send it, adding something to the message size to allow for imprecision
2319 and things that get added en route. Exim keeps the number of lines
2320 in a message, so we can give an accurate value for the original message, but we
2321 need some additional to handle added headers. (Double "." characters don't get
2322 included in the count.) */
2324 if ( message_size > 0
2325 && sx->peer_offered & OPTION_SIZE && !(sx->avoid_option & OPTION_SIZE))
2327 /*XXX problem here under spool_files_wireformat?
2328 Or just forget about lines? Or inflate by a fixed proportion? */
2330 sprintf(CS p, " SIZE=%d", message_size+message_linecount+sx->ob->size_addition);
2334 #ifndef DISABLE_PRDR
2335 /* If it supports Per-Recipient Data Reponses, and we have omre than one recipient,
2338 sx->prdr_active = FALSE;
2339 if (sx->peer_offered & OPTION_PRDR)
2340 for (addr = addrlist; addr; addr = addr->next)
2341 if (addr->transport_return == PENDING_DEFER)
2343 for (addr = addr->next; addr; addr = addr->next)
2344 if (addr->transport_return == PENDING_DEFER)
2345 { /* at least two recipients to send */
2346 sx->prdr_active = TRUE;
2347 sprintf(CS p, " PRDR"); p += 5;
2355 /* If it supports internationalised messages, and this meesage need that,
2358 if ( sx->peer_offered & OPTION_UTF8
2359 && addrlist->prop.utf8_msg
2360 && !addrlist->prop.utf8_downcvt
2362 Ustrcpy(p, " SMTPUTF8"), p += 9;
2365 /* check if all addresses have DSN-lasthop flag; do not send RET and ENVID if so */
2366 for (sx->dsn_all_lasthop = TRUE, addr = addrlist, address_count = 0;
2367 addr && address_count < sx->max_rcpt;
2368 addr = addr->next) if (addr->transport_return == PENDING_DEFER)
2371 if (!(addr->dsn_flags & rf_dsnlasthop))
2373 sx->dsn_all_lasthop = FALSE;
2378 /* Add any DSN flags to the mail command */
2380 if (sx->peer_offered & OPTION_DSN && !sx->dsn_all_lasthop)
2382 if (dsn_ret == dsn_ret_hdrs)
2383 { Ustrcpy(p, " RET=HDRS"); p += 9; }
2384 else if (dsn_ret == dsn_ret_full)
2385 { Ustrcpy(p, " RET=FULL"); p += 9; }
2389 string_format(p, sizeof(sx->buffer) - (p-sx->buffer), " ENVID=%s", dsn_envid);
2394 /* If an authenticated_sender override has been specified for this transport
2395 instance, expand it. If the expansion is forced to fail, and there was already
2396 an authenticated_sender for this message, the original value will be used.
2397 Other expansion failures are serious. An empty result is ignored, but there is
2398 otherwise no check - this feature is expected to be used with LMTP and other
2399 cases where non-standard addresses (e.g. without domains) might be required. */
2401 if (smtp_mail_auth_str(p, sizeof(sx->buffer) - (p-sx->buffer), addrlist, sx->ob))
2409 build_rcptcmd_options(smtp_context * sx, const address_item * addr)
2411 uschar * p = sx->buffer;
2414 /* Add any DSN flags to the rcpt command */
2416 if (sx->peer_offered & OPTION_DSN && !(addr->dsn_flags & rf_dsnlasthop))
2418 if (addr->dsn_flags & rf_dsnflags)
2423 Ustrcpy(p, " NOTIFY=");
2425 for (i = 0; i < nelem(rf_list); i++) if (addr->dsn_flags & rf_list[i])
2427 if (!first) *p++ = ',';
2429 Ustrcpy(p, rf_names[i]);
2434 if (addr->dsn_orcpt)
2436 string_format(p, sizeof(sx->buffer) - (p-sx->buffer), " ORCPT=%s",
2447 0 good, rcpt results in addr->transport_return (PENDING_OK, DEFER, FAIL)
2448 -1 MAIL response error
2449 -2 any non-MAIL read i/o error
2450 -3 non-MAIL response timeout
2451 -4 internal error; channel still usable
2456 smtp_write_mail_and_rcpt_cmds(smtp_context * sx, int * yield)
2458 address_item * addr;
2462 if (build_mailcmd_options(sx, sx->first_addr) != OK)
2468 /* From here until we send the DATA command, we can make use of PIPELINING
2469 if the server host supports it. The code has to be able to check the responses
2470 at any point, for when the buffer fills up, so we write it totally generally.
2471 When PIPELINING is off, each command written reports that it has flushed the
2474 sx->pending_MAIL = TRUE; /* The block starts with MAIL */
2477 uschar * s = sx->from_addr;
2479 uschar * errstr = NULL;
2481 /* If we must downconvert, do the from-address here. Remember we had to
2482 for the to-addresses (done below), and also (ugly) for re-doing when building
2483 the delivery log line. */
2485 if ( sx->addrlist->prop.utf8_msg
2486 && (sx->addrlist->prop.utf8_downcvt || !(sx->peer_offered & OPTION_UTF8))
2489 if (s = string_address_utf8_to_alabel(s, &errstr), errstr)
2491 set_errno_nohost(sx->addrlist, ERRNO_EXPANDFAIL, errstr, DEFER, FALSE);
2495 setflag(sx->addrlist, af_utf8_downcvt);
2499 rc = smtp_write_command(&sx->outblock, pipelining_active ? SCMD_BUFFER : SCMD_FLUSH,
2500 "MAIL FROM:<%s>%s\r\n", s, sx->buffer);
2503 mail_command = string_copy(big_buffer); /* Save for later error message */
2507 case -1: /* Transmission error */
2510 case +1: /* Cmd was sent */
2511 if (!smtp_read_response(&sx->inblock, sx->buffer, sizeof(sx->buffer), '2',
2512 sx->ob->command_timeout))
2514 if (errno == 0 && sx->buffer[0] == '4')
2516 errno = ERRNO_MAIL4XX;
2517 sx->addrlist->more_errno |= ((sx->buffer[1] - '0')*10 + sx->buffer[2] - '0') << 8;
2521 sx->pending_MAIL = FALSE;
2524 /* otherwise zero: command queued for pipeline */
2527 /* Pass over all the relevant recipient addresses for this host, which are the
2528 ones that have status PENDING_DEFER. If we are using PIPELINING, we can send
2529 several before we have to read the responses for those seen so far. This
2530 checking is done by a subroutine because it also needs to be done at the end.
2531 Send only up to max_rcpt addresses at a time, leaving next_addr pointing to
2532 the next one if not all are sent.
2534 In the MUA wrapper situation, we want to flush the PIPELINING buffer for the
2535 last address because we want to abort if any recipients have any kind of
2536 problem, temporary or permanent. We know that all recipient addresses will have
2537 the PENDING_DEFER status, because only one attempt is ever made, and we know
2538 that max_rcpt will be large, so all addresses will be done at once.
2540 For verify we flush the pipeline after any (the only) rcpt address. */
2542 for (addr = sx->first_addr, address_count = 0;
2543 addr && address_count < sx->max_rcpt;
2544 addr = addr->next) if (addr->transport_return == PENDING_DEFER)
2550 if (tcp_out_fastopen && !tcp_out_fastopen_logged)
2552 setflag(addr, af_tcp_fastopen_conn);
2553 if (tcp_out_fastopen > 1) setflag(addr, af_tcp_fastopen);
2556 addr->dsn_aware = sx->peer_offered & OPTION_DSN
2557 ? dsn_support_yes : dsn_support_no;
2560 no_flush = pipelining_active && !sx->verify
2561 && (!mua_wrapper || addr->next && address_count < sx->max_rcpt);
2563 build_rcptcmd_options(sx, addr);
2565 /* Now send the RCPT command, and process outstanding responses when
2566 necessary. After a timeout on RCPT, we just end the function, leaving the
2567 yield as OK, because this error can often mean that there is a problem with
2568 just one address, so we don't want to delay the host. */
2570 rcpt_addr = transport_rcpt_address(addr, sx->tblock->rcpt_include_affixes);
2573 if ( testflag(sx->addrlist, af_utf8_downcvt)
2574 && !(rcpt_addr = string_address_utf8_to_alabel(rcpt_addr, NULL))
2577 /*XXX could we use a per-address errstr here? Not fail the whole send? */
2578 errno = ERRNO_EXPANDFAIL;
2579 return -5; /*XXX too harsh? */
2583 count = smtp_write_command(&sx->outblock, no_flush ? SCMD_BUFFER : SCMD_FLUSH,
2584 "RCPT TO:<%s>%s%s\r\n", rcpt_addr, sx->igquotstr, sx->buffer);
2586 if (count < 0) return -5;
2589 switch(sync_responses(sx, count, 0))
2591 case 3: sx->ok = TRUE; /* 2xx & 5xx => OK & progress made */
2592 case 2: sx->completed_addr = TRUE; /* 5xx (only) => progress made */
2595 case 1: sx->ok = TRUE; /* 2xx (only) => OK, but if LMTP, */
2596 if (!sx->lmtp) /* can't tell about progress yet */
2597 sx->completed_addr = TRUE;
2598 case 0: /* No 2xx or 5xx, but no probs */
2601 case -1: return -3; /* Timeout on RCPT */
2602 case -2: return -2; /* non-MAIL read i/o error */
2603 default: return -1; /* any MAIL error */
2605 sx->pending_MAIL = FALSE; /* Dealt with MAIL */
2607 } /* Loop for next address */
2609 tcp_out_fastopen_logged = TRUE;
2610 sx->next_addr = addr;
2616 /*****************************************************
2617 * Proxy TLS connection for another transport process *
2618 ******************************************************/
2620 Close the unused end of the pipe, fork once more, then use the given buffer
2621 as a staging area, and select on both the given fd and the TLS'd client-fd for
2622 data to read (per the coding in ip_recv() and fd_ready() this is legitimate).
2623 Do blocking full-size writes, and reads under a timeout. Once both input
2624 channels are closed, exit the process.
2627 buf space to use for buffering
2628 bufsiz size of buffer
2629 pfd pipe filedescriptor array; [0] is comms to proxied process
2630 timeout per-read timeout, seconds
2634 smtp_proxy_tls(uschar * buf, size_t bsize, int * pfd, int timeout)
2637 int max_fd = MAX(pfd[0], tls_out.active) + 1;
2638 int rc, i, fd_bits, nbytes;
2643 DEBUG(D_transport) debug_printf("proxy-proc final-pid %d\n", rc);
2644 _exit(rc < 0 ? EXIT_FAILURE : EXIT_SUCCESS);
2647 if (running_in_test_harness) millisleep(100); /* let parent debug out */
2648 set_process_info("proxying TLS connection for continued transport");
2650 FD_SET(tls_out.active, &rfds);
2651 FD_SET(pfd[0], &rfds);
2653 for (fd_bits = 3; fd_bits; )
2655 time_t time_left = timeout;
2656 time_t time_start = time(NULL);
2662 struct timeval tv = { time_left, 0 };
2665 (SELECT_ARG2_TYPE *)&rfds, NULL, (SELECT_ARG2_TYPE *)&efds, &tv);
2667 if (rc < 0 && errno == EINTR)
2668 if ((time_left -= time(NULL) - time_start) > 0) continue;
2672 DEBUG(D_transport) if (rc == 0) debug_printf("%s: timed out\n", __FUNCTION__);
2676 if (FD_ISSET(tls_out.active, &efds) || FD_ISSET(pfd[0], &efds))
2678 DEBUG(D_transport) debug_printf("select: exceptional cond on %s fd\n",
2679 FD_ISSET(pfd[0], &efds) ? "proxy" : "tls");
2683 while (rc < 0 || !(FD_ISSET(tls_out.active, &rfds) || FD_ISSET(pfd[0], &rfds)));
2685 /* handle inbound data */
2686 if (FD_ISSET(tls_out.active, &rfds))
2687 if ((rc = tls_read(FALSE, buf, bsize)) <= 0)
2690 FD_CLR(tls_out.active, &rfds);
2691 shutdown(pfd[0], SHUT_WR);
2696 for (nbytes = 0; rc - nbytes > 0; nbytes += i)
2697 if ((i = write(pfd[0], buf + nbytes, rc - nbytes)) < 0) goto done;
2699 else if (fd_bits & 1)
2700 FD_SET(tls_out.active, &rfds);
2702 /* handle outbound data */
2703 if (FD_ISSET(pfd[0], &rfds))
2704 if ((rc = read(pfd[0], buf, bsize)) <= 0)
2707 tls_close(FALSE, TLS_SHUTDOWN_NOWAIT);
2711 for (nbytes = 0; rc - nbytes > 0; nbytes += i)
2712 if ((i = tls_write(FALSE, buf + nbytes, rc - nbytes, FALSE)) < 0)
2715 else if (fd_bits & 2)
2716 FD_SET(pfd[0], &rfds);
2720 if (running_in_test_harness) millisleep(100); /* let logging complete */
2721 exim_exit(0, US"TLS proxy");
2726 /*************************************************
2727 * Deliver address list to given host *
2728 *************************************************/
2730 /* If continue_hostname is not null, we get here only when continuing to
2731 deliver down an existing channel. The channel was passed as the standard
2732 input. TLS is never active on a passed channel; the previous process always
2733 closes it down before passing the connection on.
2735 Otherwise, we have to make a connection to the remote host, and do the
2736 initial protocol exchange.
2738 When running as an MUA wrapper, if the sender or any recipient is rejected,
2739 temporarily or permanently, we force failure for all recipients.
2742 addrlist chain of potential addresses to deliver; only those whose
2743 transport_return field is set to PENDING_DEFER are currently
2744 being processed; others should be skipped - they have either
2745 been delivered to an earlier host or IP address, or been
2746 failed by one of them.
2747 host host to deliver to
2748 host_af AF_INET or AF_INET6
2749 defport default TCP/IP port to use if host does not specify, in host
2751 interface interface to bind to, or NULL
2752 tblock transport instance block
2753 message_defer set TRUE if yield is OK, but all addresses were deferred
2754 because of a non-recipient, non-host failure, that is, a
2755 4xx response to MAIL FROM, DATA, or ".". This is a defer
2756 that is specific to the message.
2757 suppress_tls if TRUE, don't attempt a TLS connection - this is set for
2758 a second attempt after TLS initialization fails
2760 Returns: OK - the connection was made and the delivery attempted;
2761 the result for each address is in its data block.
2762 DEFER - the connection could not be made, or something failed
2763 while setting up the SMTP session, or there was a
2764 non-message-specific error, such as a timeout.
2765 ERROR - a filter command is specified for this transport,
2766 and there was a problem setting it up; OR helo_data
2767 or add_headers or authenticated_sender is specified
2768 for this transport, and the string failed to expand
2772 smtp_deliver(address_item *addrlist, host_item *host, int host_af, int defport,
2773 uschar *interface, transport_instance *tblock,
2774 BOOL *message_defer, BOOL suppress_tls)
2780 struct timeval start_delivery_time;
2782 BOOL pass_message = FALSE;
2783 uschar *message = NULL;
2784 uschar new_message_id[MESSAGE_ID_LENGTH + 1];
2788 gettimeofday(&start_delivery_time, NULL);
2789 suppress_tls = suppress_tls; /* stop compiler warning when no TLS support */
2790 *message_defer = FALSE;
2792 sx.addrlist = addrlist;
2794 sx.host_af = host_af,
2796 sx.interface = interface;
2797 sx.helo_data = NULL;
2801 /* Get the channel set up ready for a message (MAIL FROM being the next
2802 SMTP command to send */
2804 if ((rc = smtp_setup_conn(&sx, suppress_tls)) != OK)
2807 /* If there is a filter command specified for this transport, we can now
2808 set it up. This cannot be done until the identify of the host is known. */
2810 if (tblock->filter_command)
2812 transport_filter_timeout = tblock->filter_timeout;
2814 /* On failure, copy the error to all addresses, abandon the SMTP call, and
2817 if (!transport_set_up_command(&transport_filter_argv,
2818 tblock->filter_command, TRUE, DEFER, addrlist,
2819 string_sprintf("%.50s transport", tblock->name), NULL))
2821 set_errno_nohost(addrlist->next, addrlist->basic_errno, addrlist->message, DEFER,
2827 if ( transport_filter_argv
2828 && *transport_filter_argv
2829 && **transport_filter_argv
2830 && sx.peer_offered & OPTION_CHUNKING
2833 sx.peer_offered &= ~OPTION_CHUNKING;
2834 DEBUG(D_transport) debug_printf("CHUNKING not usable due to transport filter\n");
2838 sx.first_addr = addrlist;
2840 /* For messages that have more than the maximum number of envelope recipients,
2841 we want to send several transactions down the same SMTP connection. (See
2842 comments in deliver.c as to how this reconciles, heuristically, with
2843 remote_max_parallel.) This optimization was added to Exim after the following
2844 code was already working. The simplest way to put it in without disturbing the
2845 code was to use a goto to jump back to this point when there is another
2846 transaction to handle. */
2849 sx.from_addr = return_path;
2850 sx.sync_addr = sx.first_addr;
2852 sx.send_rset = TRUE;
2853 sx.completed_addr = FALSE;
2856 /* If we are a continued-connection-after-verify the MAIL and RCPT
2857 commands were already sent; do not re-send but do mark the addrs as
2858 having been accepted up to RCPT stage. A traditional cont-conn
2859 always has a sequence number greater than one. */
2861 if (continue_hostname && continue_sequence == 1)
2863 address_item * addr;
2865 sx.peer_offered = smtp_peer_options;
2866 sx.pending_MAIL = FALSE;
2868 sx.next_addr = NULL;
2870 for (addr = addrlist; addr; addr = addr->next)
2871 addr->transport_return = PENDING_OK;
2875 /* Initiate a message transfer. */
2877 switch(smtp_write_mail_and_rcpt_cmds(&sx, &yield))
2880 case -1: case -2: goto RESPONSE_FAILED;
2881 case -3: goto END_OFF;
2882 case -4: goto SEND_QUIT;
2883 default: goto SEND_FAILED;
2886 /* If we are an MUA wrapper, abort if any RCPTs were rejected, either
2887 permanently or temporarily. We should have flushed and synced after the last
2895 for (a = sx.first_addr, cnt = 0; a && cnt < sx.max_rcpt; a = a->next, cnt++)
2896 if (a->transport_return != PENDING_OK)
2898 /*XXX could we find a better errno than 0 here? */
2899 set_errno_nohost(addrlist, 0, a->message, FAIL,
2900 testflag(a, af_pass_message));
2907 /* If ok is TRUE, we know we have got at least one good recipient, and must now
2908 send DATA, but if it is FALSE (in the normal, non-wrapper case), we may still
2909 have a good recipient buffered up if we are pipelining. We don't want to waste
2910 time sending DATA needlessly, so we only send it if either ok is TRUE or if we
2911 are pipelining. The responses are all handled by sync_responses().
2912 If using CHUNKING, do not send a BDAT until we know how big a chunk we want
2915 if ( !(sx.peer_offered & OPTION_CHUNKING)
2916 && (sx.ok || (pipelining_active && !mua_wrapper)))
2918 int count = smtp_write_command(&sx.outblock, SCMD_FLUSH, "DATA\r\n");
2920 if (count < 0) goto SEND_FAILED;
2921 switch(sync_responses(&sx, count, sx.ok ? +1 : -1))
2923 case 3: sx.ok = TRUE; /* 2xx & 5xx => OK & progress made */
2924 case 2: sx.completed_addr = TRUE; /* 5xx (only) => progress made */
2927 case 1: sx.ok = TRUE; /* 2xx (only) => OK, but if LMTP, */
2928 if (!sx.lmtp) sx.completed_addr = TRUE; /* can't tell about progress yet */
2929 case 0: break; /* No 2xx or 5xx, but no probs */
2931 case -1: goto END_OFF; /* Timeout on RCPT */
2932 default: goto RESPONSE_FAILED; /* I/O error, or any MAIL/DATA error */
2934 pipelining_active = FALSE;
2935 data_command = string_copy(big_buffer); /* Save for later error message */
2938 /* If there were no good recipients (but otherwise there have been no
2939 problems), just set ok TRUE, since we have handled address-specific errors
2940 already. Otherwise, it's OK to send the message. Use the check/escape mechanism
2941 for handling the SMTP dot-handling protocol, flagging to apply to headers as
2942 well as body. Set the appropriate timeout value to be used for each chunk.
2943 (Haven't been able to make it work using select() for writing yet.) */
2945 if (!(sx.peer_offered & OPTION_CHUNKING) && !sx.ok)
2947 /* Save the first address of the next batch. */
2948 sx.first_addr = sx.next_addr;
2954 transport_ctx tctx = {
2958 US".", US"..", /* Escaping strings */
2959 topt_use_crlf | topt_escape_headers
2960 | (tblock->body_only ? topt_no_headers : 0)
2961 | (tblock->headers_only ? topt_no_body : 0)
2962 | (tblock->return_path_add ? topt_add_return_path : 0)
2963 | (tblock->delivery_date_add ? topt_add_delivery_date : 0)
2964 | (tblock->envelope_to_add ? topt_add_envelope_to : 0)
2967 /* If using CHUNKING we need a callback from the generic transport
2968 support to us, for the sending of BDAT smtp commands and the reaping
2969 of responses. The callback needs a whole bunch of state so set up
2970 a transport-context structure to be passed around. */
2972 if (sx.peer_offered & OPTION_CHUNKING)
2974 tctx.check_string = tctx.escape_string = NULL;
2975 tctx.options |= topt_use_bdat;
2976 tctx.chunk_cb = smtp_chunk_cmd_callback;
2977 sx.pending_BDAT = FALSE;
2978 sx.good_RCPT = sx.ok;
2980 tctx.smtp_context = &sx;
2983 tctx.options |= topt_end_dot;
2985 /* Save the first address of the next batch. */
2986 sx.first_addr = sx.next_addr;
2988 /* Responses from CHUNKING commands go in buffer. Otherwise,
2989 there has not been a response. */
2993 sigalrm_seen = FALSE;
2994 transport_write_timeout = sx.ob->data_timeout;
2995 smtp_command = US"sending data block"; /* For error messages */
2996 DEBUG(D_transport|D_v)
2997 if (sx.peer_offered & OPTION_CHUNKING)
2998 debug_printf(" will write message using CHUNKING\n");
3000 debug_printf(" SMTP>> writing message and terminating \".\"\n");
3001 transport_count = 0;
3003 #ifndef DISABLE_DKIM
3004 dkim_exim_sign_init();
3005 # ifdef EXPERIMENTAL_ARC
3007 uschar * s = sx.ob->arc_sign;
3010 if (!(sx.ob->dkim.arc_signspec = s = expand_string(s)))
3012 if (!expand_string_forcedfail)
3014 message = US"failed to expand arc_sign";
3021 /* Ask dkim code to hash the body for ARC */
3022 (void) arc_ams_setup_sign_bodyhash();
3023 sx.ob->dkim.force_bodyhash = TRUE;
3028 sx.ok = dkim_transport_write_message(&tctx, &sx.ob->dkim, CUSS &message);
3030 sx.ok = transport_write_message(&tctx, 0);
3033 /* transport_write_message() uses write() because it is called from other
3034 places to write to non-sockets. This means that under some OS (e.g. Solaris)
3035 it can exit with "Broken pipe" as its error. This really means that the
3036 socket got closed at the far end. */
3038 transport_write_timeout = 0; /* for subsequent transports */
3040 /* Failure can either be some kind of I/O disaster (including timeout),
3041 or the failure of a transport filter or the expansion of added headers.
3042 Or, when CHUNKING, it can be a protocol-detected failure. */
3045 if (message) goto SEND_FAILED;
3046 else goto RESPONSE_FAILED;
3048 /* We used to send the terminating "." explicitly here, but because of
3049 buffering effects at both ends of TCP/IP connections, you don't gain
3050 anything by keeping it separate, so it might as well go in the final
3051 data buffer for efficiency. This is now done by setting the topt_end_dot
3054 smtp_command = US"end of data";
3056 if (sx.peer_offered & OPTION_CHUNKING && sx.cmd_count > 1)
3058 /* Reap any outstanding MAIL & RCPT commands, but not a DATA-go-ahead */
3059 switch(sync_responses(&sx, sx.cmd_count-1, 0))
3061 case 3: sx.ok = TRUE; /* 2xx & 5xx => OK & progress made */
3062 case 2: sx.completed_addr = TRUE; /* 5xx (only) => progress made */
3065 case 1: sx.ok = TRUE; /* 2xx (only) => OK, but if LMTP, */
3066 if (!sx.lmtp) sx.completed_addr = TRUE; /* can't tell about progress yet */
3067 case 0: break; /* No 2xx or 5xx, but no probs */
3069 case -1: goto END_OFF; /* Timeout on RCPT */
3070 default: goto RESPONSE_FAILED; /* I/O error, or any MAIL/DATA error */
3074 #ifndef DISABLE_PRDR
3075 /* For PRDR we optionally get a partial-responses warning
3076 * followed by the individual responses, before going on with
3077 * the overall response. If we don't get the warning then deal
3078 * with per non-PRDR. */
3081 sx.ok = smtp_read_response(&sx.inblock, sx.buffer, sizeof(sx.buffer), '3',
3082 sx.ob->final_timeout);
3083 if (!sx.ok && errno == 0) switch(sx.buffer[0])
3085 case '2': sx.prdr_active = FALSE;
3088 case '4': errno = ERRNO_DATA4XX;
3089 addrlist->more_errno |=
3090 ((sx.buffer[1] - '0')*10 + sx.buffer[2] - '0') << 8;
3097 /* For non-PRDR SMTP, we now read a single response that applies to the
3098 whole message. If it is OK, then all the addresses have been delivered. */
3102 sx.ok = smtp_read_response(&sx.inblock, sx.buffer, sizeof(sx.buffer), '2',
3103 sx.ob->final_timeout);
3104 if (!sx.ok && errno == 0 && sx.buffer[0] == '4')
3106 errno = ERRNO_DATA4XX;
3107 addrlist->more_errno |= ((sx.buffer[1] - '0')*10 + sx.buffer[2] - '0') << 8;
3111 /* For LMTP, we get back a response for every RCPT command that we sent;
3112 some may be accepted and some rejected. For those that get a response, their
3113 status is fixed; any that are accepted have been handed over, even if later
3114 responses crash - at least, that's how I read RFC 2033.
3116 If all went well, mark the recipient addresses as completed, record which
3117 host/IPaddress they were delivered to, and cut out RSET when sending another
3118 message down the same channel. Write the completed addresses to the journal
3119 now so that they are recorded in case there is a crash of hardware or
3120 software before the spool gets updated. Also record the final SMTP
3121 confirmation if needed (for SMTP only). */
3126 struct timeval delivery_time;
3128 uschar * conf = NULL;
3130 timesince(&delivery_time, &start_delivery_time);
3131 sx.send_rset = FALSE;
3132 pipelining_active = FALSE;
3134 /* Set up confirmation if needed - applies only to SMTP */
3137 #ifdef DISABLE_EVENT
3138 LOGGING(smtp_confirmation) &&
3143 const uschar *s = string_printing(sx.buffer);
3144 /* deconst cast ok here as string_printing was checked to have alloc'n'copied */
3145 conf = (s == sx.buffer)? US string_copy(s) : US s;
3148 /* Process all transported addresses - for LMTP or PRDR, read a status for
3151 for (addr = addrlist; addr != sx.first_addr; addr = addr->next)
3153 if (addr->transport_return != PENDING_OK) continue;
3155 /* LMTP - if the response fails badly (e.g. timeout), use it for all the
3156 remaining addresses. Otherwise, it's a return code for just the one
3157 address. For temporary errors, add a retry item for the address so that
3158 it doesn't get tried again too soon. */
3160 #ifndef DISABLE_PRDR
3161 if (sx.lmtp || sx.prdr_active)
3166 if (!smtp_read_response(&sx.inblock, sx.buffer, sizeof(sx.buffer), '2',
3167 sx.ob->final_timeout))
3169 if (errno != 0 || sx.buffer[0] == 0) goto RESPONSE_FAILED;
3170 addr->message = string_sprintf(
3171 #ifndef DISABLE_PRDR
3172 "%s error after %s: %s", sx.prdr_active ? "PRDR":"LMTP",
3174 "LMTP error after %s: %s",
3176 data_command, string_printing(sx.buffer));
3177 setflag(addr, af_pass_message); /* Allow message to go to user */
3178 if (sx.buffer[0] == '5')
3179 addr->transport_return = FAIL;
3182 errno = ERRNO_DATA4XX;
3183 addr->more_errno |= ((sx.buffer[1] - '0')*10 + sx.buffer[2] - '0') << 8;
3184 addr->transport_return = DEFER;
3185 #ifndef DISABLE_PRDR
3186 if (!sx.prdr_active)
3188 retry_add_item(addr, addr->address_retry_key, 0);
3192 sx.completed_addr = TRUE; /* NOW we can set this flag */
3193 if (LOGGING(smtp_confirmation))
3195 const uschar *s = string_printing(sx.buffer);
3196 /* deconst cast ok here as string_printing was checked to have alloc'n'copied */
3197 conf = (s == sx.buffer) ? US string_copy(s) : US s;
3201 /* SMTP, or success return from LMTP for this address. Pass back the
3202 actual host that was used. */
3204 addr->transport_return = OK;
3205 addr->more_errno = delivery_time.tv_sec;
3206 addr->delivery_usec = delivery_time.tv_usec;
3207 addr->host_used = host;
3208 addr->special_action = flag;
3209 addr->message = conf;
3210 #ifndef DISABLE_PRDR
3211 if (sx.prdr_active) setflag(addr, af_prdr_used);
3213 if (sx.peer_offered & OPTION_CHUNKING) setflag(addr, af_chunking_used);
3216 #ifndef DISABLE_PRDR
3217 if (!sx.prdr_active)
3220 /* Update the journal. For homonymic addresses, use the base address plus
3221 the transport name. See lots of comments in deliver.c about the reasons
3222 for the complications when homonyms are involved. Just carry on after
3223 write error, as it may prove possible to update the spool file later. */
3225 if (testflag(addr, af_homonym))
3226 sprintf(CS sx.buffer, "%.500s/%s\n", addr->unique + 3, tblock->name);
3228 sprintf(CS sx.buffer, "%.500s\n", addr->unique);
3230 DEBUG(D_deliver) debug_printf("S:journalling %s\n", sx.buffer);
3231 len = Ustrlen(CS sx.buffer);
3232 if (write(journal_fd, sx.buffer, len) != len)
3233 log_write(0, LOG_MAIN|LOG_PANIC, "failed to write journal for "
3234 "%s: %s", sx.buffer, strerror(errno));
3238 #ifndef DISABLE_PRDR
3241 const uschar * overall_message;
3243 /* PRDR - get the final, overall response. For any non-success
3244 upgrade all the address statuses. */
3246 sx.ok = smtp_read_response(&sx.inblock, sx.buffer, sizeof(sx.buffer), '2',
3247 sx.ob->final_timeout);
3250 if(errno == 0 && sx.buffer[0] == '4')
3252 errno = ERRNO_DATA4XX;
3253 addrlist->more_errno |= ((sx.buffer[1] - '0')*10 + sx.buffer[2] - '0') << 8;
3255 for (addr = addrlist; addr != sx.first_addr; addr = addr->next)
3256 if (sx.buffer[0] == '5' || addr->transport_return == OK)
3257 addr->transport_return = PENDING_OK; /* allow set_errno action */
3258 goto RESPONSE_FAILED;
3261 /* Append the overall response to the individual PRDR response for logging
3262 and update the journal, or setup retry. */
3264 overall_message = string_printing(sx.buffer);
3265 for (addr = addrlist; addr != sx.first_addr; addr = addr->next)
3266 if (addr->transport_return == OK)
3267 addr->message = string_sprintf("%s\\n%s", addr->message, overall_message);
3269 for (addr = addrlist; addr != sx.first_addr; addr = addr->next)
3270 if (addr->transport_return == OK)
3272 if (testflag(addr, af_homonym))
3273 sprintf(CS sx.buffer, "%.500s/%s\n", addr->unique + 3, tblock->name);
3275 sprintf(CS sx.buffer, "%.500s\n", addr->unique);
3277 DEBUG(D_deliver) debug_printf("journalling(PRDR) %s\n", sx.buffer);
3278 len = Ustrlen(CS sx.buffer);
3279 if (write(journal_fd, sx.buffer, len) != len)
3280 log_write(0, LOG_MAIN|LOG_PANIC, "failed to write journal for "
3281 "%s: %s", sx.buffer, strerror(errno));
3283 else if (addr->transport_return == DEFER)
3284 retry_add_item(addr, addr->address_retry_key, -2);
3288 /* Ensure the journal file is pushed out to disk. */
3290 if (EXIMfsync(journal_fd) < 0)
3291 log_write(0, LOG_MAIN|LOG_PANIC, "failed to fsync journal: %s",
3297 /* Handle general (not specific to one address) failures here. The value of ok
3298 is used to skip over this code on the falling through case. A timeout causes a
3299 deferral. Other errors may defer or fail according to the response code, and
3300 may set up a special errno value, e.g. after connection chopped, which is
3301 assumed if errno == 0 and there is no text in the buffer. If control reaches
3302 here during the setting up phase (i.e. before MAIL FROM) then always defer, as
3303 the problem is not related to this specific message. */
3308 uschar * set_message;
3314 sx.send_quit = check_response(host, &save_errno, addrlist->more_errno,
3315 sx.buffer, &code, &message, &pass_message);
3323 message = string_sprintf("send() to %s [%s] failed: %s",
3324 host->name, host->address, message ? message : US strerror(save_errno));
3325 sx.send_quit = FALSE;
3333 sx.ok = FALSE; /* For when reached by GOTO */
3334 set_message = message;
3336 /* We want to handle timeouts after MAIL or "." and loss of connection after
3337 "." specially. They can indicate a problem with the sender address or with
3338 the contents of the message rather than a real error on the connection. These
3339 cases are treated in the same way as a 4xx response. This next bit of code
3340 does the classification. */
3347 message_error = TRUE;
3351 message_error = Ustrncmp(smtp_command,"MAIL",4) == 0 ||
3352 Ustrncmp(smtp_command,"end ",4) == 0;
3355 case ERRNO_SMTPCLOSED:
3356 message_error = Ustrncmp(smtp_command,"end ",4) == 0;
3360 message_error = FALSE;
3364 /* Handle the cases that are treated as message errors. These are:
3366 (a) negative response or timeout after MAIL
3367 (b) negative response after DATA
3368 (c) negative response or timeout or dropped connection after "."
3369 (d) utf8 support required and not offered
3371 It won't be a negative response or timeout after RCPT, as that is dealt
3372 with separately above. The action in all cases is to set an appropriate
3373 error code for all the addresses, but to leave yield set to OK because the
3374 host itself has not failed. Of course, it might in practice have failed
3375 when we've had a timeout, but if so, we'll discover that at the next
3376 delivery attempt. For a temporary error, set the message_defer flag, and
3377 write to the logs for information if this is not the last host. The error
3378 for the last host will be logged as part of the address's log line. */
3382 if (mua_wrapper) code = '5'; /* Force hard failure in wrapper mode */
3384 /* If there's an errno, the message contains just the identity of
3389 else /* Anything other than 5 is treated as temporary */
3393 message = US string_sprintf("%s: %s", message, strerror(save_errno));
3395 write_logs(host, message, sx.first_addr ? sx.first_addr->basic_errno : 0);
3397 *message_defer = TRUE;
3401 /* Otherwise, we have an I/O error or a timeout other than after MAIL or
3402 ".", or some other transportation error. We defer all addresses and yield
3403 DEFER, except for the case of failed add_headers expansion, or a transport
3404 filter failure, when the yield should be ERROR, to stop it trying other
3410 yield = (save_errno == ERRNO_CHHEADER_FAIL ||
3411 save_errno == ERRNO_FILTER_FAIL)? ERROR : DEFER;
3415 set_errno(addrlist, save_errno, set_message, set_rc, pass_message, host
3416 #ifdef EXPERIMENTAL_DSN_INFO
3417 , sx.smtp_greeting, sx.helo_response
3423 /* If all has gone well, send_quit will be set TRUE, implying we can end the
3424 SMTP session tidily. However, if there were too many addresses to send in one
3425 message (indicated by first_addr being non-NULL) we want to carry on with the
3426 rest of them. Also, it is desirable to send more than one message down the SMTP
3427 connection if there are several waiting, provided we haven't already sent so
3428 many as to hit the configured limit. The function transport_check_waiting looks
3429 for a waiting message and returns its id. Then transport_pass_socket tries to
3430 set up a continued delivery by passing the socket on to another process. The
3431 variable send_rset is FALSE if a message has just been successfully transfered.
3433 If we are already sending down a continued channel, there may be further
3434 addresses not yet delivered that are aimed at the same host, but which have not
3435 been passed in this run of the transport. In this case, continue_more will be
3436 true, and all we should do is send RSET if necessary, and return, leaving the
3439 However, if no address was disposed of, i.e. all addresses got 4xx errors, we
3440 do not want to continue with other messages down the same channel, because that
3441 can lead to looping between two or more messages, all with the same,
3442 temporarily failing address(es). [The retry information isn't updated yet, so
3443 new processes keep on trying.] We probably also don't want to try more of this
3444 message's addresses either.
3446 If we have started a TLS session, we have to end it before passing the
3447 connection to a new process. However, not all servers can handle this (Exim
3448 can), so we do not pass such a connection on if the host matches
3449 hosts_nopass_tls. */
3452 debug_printf("ok=%d send_quit=%d send_rset=%d continue_more=%d "
3453 "yield=%d first_address is %sNULL\n", sx.ok, sx.send_quit,
3454 sx.send_rset, continue_more, yield, sx.first_addr ? "not " : "");
3456 if (sx.completed_addr && sx.ok && sx.send_quit)
3459 smtp_compare_t t_compare;
3461 t_compare.tblock = tblock;
3462 t_compare.current_sender_address = sender_address;
3464 if ( sx.first_addr != NULL
3468 ( tls_out.active < 0 && !continue_proxy_cipher
3469 || verify_check_given_host(&sx.ob->hosts_nopass_tls, host) != OK
3473 transport_check_waiting(tblock->name, host->name,
3474 tblock->connection_max_messages, new_message_id, &more,
3475 (oicf)smtp_are_same_identities, (void*)&t_compare)
3482 if (! (sx.ok = smtp_write_command(&sx.outblock, SCMD_FLUSH, "RSET\r\n") >= 0))
3484 msg = US string_sprintf("send() to %s [%s] failed: %s", host->name,
3485 host->address, strerror(errno));
3486 sx.send_quit = FALSE;
3488 else if (! (sx.ok = smtp_read_response(&sx.inblock, sx.buffer,
3489 sizeof(sx.buffer), '2', sx.ob->command_timeout)))
3492 sx.send_quit = check_response(host, &errno, 0, sx.buffer, &code, &msg,
3496 DEBUG(D_transport) debug_printf("H=%s [%s] %s\n",
3497 host->name, host->address, msg);
3501 /* Either RSET was not needed, or it succeeded */
3506 int socket_fd = sx.inblock.sock;
3509 if (sx.first_addr != NULL) /* More addresses still to be sent */
3510 { /* in this run of the transport */
3511 continue_sequence++; /* Causes * in logging */
3515 /* Unless caller said it already has more messages listed for this host,
3516 pass the connection on to a new Exim process (below, the call to
3517 transport_pass_socket). If the caller has more ready, just return with
3518 the connection still open. */
3521 if (tls_out.active >= 0)
3523 || verify_check_given_host(&sx.ob->hosts_noproxy_tls, host) == OK)
3525 /* Before passing the socket on, or returning to caller with it still
3526 open, we must shut down TLS. Not all MTAs allow for the continuation
3527 of the SMTP session when TLS is shut down. We test for this by sending
3528 a new EHLO. If we don't get a good response, we don't attempt to pass
3531 tls_close(FALSE, TLS_SHUTDOWN_WAIT);
3532 smtp_peer_options = smtp_peer_options_wrap;
3534 && smtp_write_command(&sx.outblock, SCMD_FLUSH,
3535 "EHLO %s\r\n", sx.helo_data) >= 0
3536 && smtp_read_response(&sx.inblock, sx.buffer, sizeof(sx.buffer),
3537 '2', sx.ob->command_timeout);
3539 if (sx.ok && continue_more)
3540 return yield; /* More addresses for another run */
3544 /* Set up a pipe for proxying TLS for the new transport process */
3546 smtp_peer_options |= OPTION_TLS;
3547 if (sx.ok = (socketpair(AF_UNIX, SOCK_STREAM, 0, pfd) == 0))
3550 set_errno(sx.first_addr, errno, US"internal allocation problem",
3552 # ifdef EXPERIMENTAL_DSN_INFO
3553 , sx.smtp_greeting, sx.helo_response
3560 return yield; /* More addresses for another run */
3562 /* If the socket is successfully passed, we mustn't send QUIT (or
3563 indeed anything!) from here. */
3565 /*XXX DSN_INFO: assume likely to do new HELO; but for greet we'll want to
3566 propagate it from the initial
3568 if (sx.ok && transport_pass_socket(tblock->name, host->name,
3569 host->address, new_message_id, socket_fd))
3571 sx.send_quit = FALSE;
3573 /* We have passed the client socket to a fresh transport process.
3574 If TLS is still active, we need to proxy it for the transport we
3575 just passed the baton to. Fork a child to to do it, and return to
3576 get logging done asap. Which way to place the work makes assumptions
3577 about post-fork prioritisation which may not hold on all platforms. */
3579 if (tls_out.active >= 0)
3582 if (pid == 0) /* child; fork again to disconnect totally */
3584 if (running_in_test_harness) millisleep(100); /* let parent debug out */
3585 /* does not return */
3586 smtp_proxy_tls(sx.buffer, sizeof(sx.buffer), pfd,
3587 sx.ob->command_timeout);
3590 if (pid > 0) /* parent */
3592 DEBUG(D_transport) debug_printf("proxy-proc inter-pid %d\n", pid);
3594 /* tidy the inter-proc to disconn the proxy proc */
3595 waitpid(pid, NULL, 0);
3596 tls_close(FALSE, TLS_NO_SHUTDOWN);
3597 (void)close(sx.inblock.sock);
3598 continue_transport = NULL;
3599 continue_hostname = NULL;
3602 log_write(0, LOG_PANIC_DIE, "fork failed");
3608 /* If RSET failed and there are addresses left, they get deferred. */
3610 set_errno(sx.first_addr, errno, msg, DEFER, FALSE, host
3611 #ifdef EXPERIMENTAL_DSN_INFO
3612 , sx.smtp_greeting, sx.helo_response
3618 /* End off tidily with QUIT unless the connection has died or the socket has
3619 been passed to another process. There has been discussion on the net about what
3620 to do after sending QUIT. The wording of the RFC suggests that it is necessary
3621 to wait for a response, but on the other hand, there isn't anything one can do
3622 with an error response, other than log it. Exim used to do that. However,
3623 further discussion suggested that it is positively advantageous not to wait for
3624 the response, but to close the session immediately. This is supposed to move
3625 the TCP/IP TIME_WAIT state from the server to the client, thereby removing some
3626 load from the server. (Hosts that are both servers and clients may not see much
3627 difference, of course.) Further discussion indicated that this was safe to do
3628 on Unix systems which have decent implementations of TCP/IP that leave the
3629 connection around for a while (TIME_WAIT) after the application has gone away.
3630 This enables the response sent by the server to be properly ACKed rather than
3631 timed out, as can happen on broken TCP/IP implementations on other OS.
3633 This change is being made on 31-Jul-98. After over a year of trouble-free
3634 operation, the old commented-out code was removed on 17-Sep-99. */
3637 if (sx.send_quit) (void)smtp_write_command(&sx.outblock, SCMD_FLUSH, "QUIT\r\n");
3642 tls_close(FALSE, TLS_SHUTDOWN_NOWAIT);
3645 /* Close the socket, and return the appropriate value, first setting
3646 works because the NULL setting is passed back to the calling process, and
3647 remote_max_parallel is forced to 1 when delivering over an existing connection,
3649 If all went well and continue_more is set, we shouldn't actually get here if
3650 there are further addresses, as the return above will be taken. However,
3651 writing RSET might have failed, or there may be other addresses whose hosts are
3652 specified in the transports, and therefore not visible at top level, in which
3653 case continue_more won't get set. */
3655 HDEBUG(D_transport|D_acl|D_v) debug_printf_indent(" SMTP(close)>>\n");
3658 shutdown(sx.outblock.sock, SHUT_WR);
3659 if (fcntl(sx.inblock.sock, F_SETFL, O_NONBLOCK) == 0)
3660 for (rc = 16; read(sx.inblock.sock, sx.inbuffer, sizeof(sx.inbuffer)) > 0 && rc > 0;)
3661 rc--; /* drain socket */
3663 (void)close(sx.inblock.sock);
3665 #ifndef DISABLE_EVENT
3666 (void) event_raise(tblock->event_action, US"tcp:close", NULL);
3669 continue_transport = NULL;
3670 continue_hostname = NULL;
3677 /*************************************************
3678 * Closedown entry point *
3679 *************************************************/
3681 /* This function is called when exim is passed an open smtp channel
3682 from another incarnation, but the message which it has been asked
3683 to deliver no longer exists. The channel is on stdin.
3685 We might do fancy things like looking for another message to send down
3686 the channel, but if the one we sought has gone, it has probably been
3687 delivered by some other process that itself will seek further messages,
3688 so just close down our connection.
3690 Argument: pointer to the transport instance block
3695 smtp_transport_closedown(transport_instance *tblock)
3697 smtp_transport_options_block *ob =
3698 (smtp_transport_options_block *)tblock->options_block;
3699 smtp_inblock inblock;
3700 smtp_outblock outblock;
3702 uschar inbuffer[4096];
3703 uschar outbuffer[16];
3705 inblock.sock = fileno(stdin);
3706 inblock.buffer = inbuffer;
3707 inblock.buffersize = sizeof(inbuffer);
3708 inblock.ptr = inbuffer;
3709 inblock.ptrend = inbuffer;
3711 outblock.sock = inblock.sock;
3712 outblock.buffersize = sizeof(outbuffer);
3713 outblock.buffer = outbuffer;
3714 outblock.ptr = outbuffer;
3715 outblock.cmd_count = 0;
3716 outblock.authenticating = FALSE;
3718 (void)smtp_write_command(&outblock, SCMD_FLUSH, "QUIT\r\n");
3719 (void)smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
3720 ob->command_timeout);
3721 (void)close(inblock.sock);
3726 /*************************************************
3727 * Prepare addresses for delivery *
3728 *************************************************/
3730 /* This function is called to flush out error settings from previous delivery
3731 attempts to other hosts. It also records whether we got here via an MX record
3732 or not in the more_errno field of the address. We are interested only in
3733 addresses that are still marked DEFER - others may have got delivered to a
3734 previously considered IP address. Set their status to PENDING_DEFER to indicate
3735 which ones are relevant this time.
3738 addrlist the list of addresses
3739 host the host we are delivering to
3741 Returns: the first address for this delivery
3744 static address_item *
3745 prepare_addresses(address_item *addrlist, host_item *host)
3747 address_item *first_addr = NULL;
3749 for (addr = addrlist; addr; addr = addr->next)
3750 if (addr->transport_return == DEFER)
3752 if (!first_addr) first_addr = addr;
3753 addr->transport_return = PENDING_DEFER;
3754 addr->basic_errno = 0;
3755 addr->more_errno = (host->mx >= 0)? 'M' : 'A';
3756 addr->message = NULL;
3758 addr->cipher = NULL;
3759 addr->ourcert = NULL;
3760 addr->peercert = NULL;
3761 addr->peerdn = NULL;
3762 addr->ocsp = OCSP_NOT_REQ;
3764 #ifdef EXPERIMENTAL_DSN_INFO
3765 addr->smtp_greeting = NULL;
3766 addr->helo_response = NULL;
3774 /*************************************************
3775 * Main entry point *
3776 *************************************************/
3778 /* See local README for interface details. As this is a remote transport, it is
3779 given a chain of addresses to be delivered in one connection, if possible. It
3780 always returns TRUE, indicating that each address has its own independent
3781 status set, except if there is a setting up problem, in which case it returns
3785 smtp_transport_entry(
3786 transport_instance *tblock, /* data for this instantiation */
3787 address_item *addrlist) /* addresses we are working on */
3791 int hosts_defer = 0;
3793 int hosts_looked_up = 0;
3794 int hosts_retry = 0;
3795 int hosts_serial = 0;
3796 int hosts_total = 0;
3797 int total_hosts_tried = 0;
3799 BOOL expired = TRUE;
3800 uschar *expanded_hosts = NULL;
3802 uschar *tid = string_sprintf("%s transport", tblock->name);
3803 smtp_transport_options_block *ob =
3804 (smtp_transport_options_block *)(tblock->options_block);
3805 host_item *hostlist = addrlist->host_list;
3810 debug_printf("%s transport entered\n", tblock->name);
3811 for (addr = addrlist; addr; addr = addr->next)
3812 debug_printf(" %s\n", addr->address);
3815 debug_printf("hostlist:\n");
3816 for (host = hostlist; host; host = host->next)
3817 debug_printf(" '%s' IP %s port %d\n", host->name, host->address, host->port);
3819 if (continue_hostname)
3820 debug_printf("already connected to %s [%s] (on fd %d)\n",
3821 continue_hostname, continue_host_address,
3822 cutthrough.fd >= 0 ? cutthrough.fd : 0);
3825 /* Set the flag requesting that these hosts be added to the waiting
3826 database if the delivery fails temporarily or if we are running with
3827 queue_smtp or a 2-stage queue run. This gets unset for certain
3828 kinds of error, typically those that are specific to the message. */
3830 update_waiting = TRUE;
3832 /* If a host list is not defined for the addresses - they must all have the
3833 same one in order to be passed to a single transport - or if the transport has
3834 a host list with hosts_override set, use the host list supplied with the
3835 transport. It is an error for this not to exist. */
3837 if (!hostlist || (ob->hosts_override && ob->hosts))
3841 addrlist->message = string_sprintf("%s transport called with no hosts set",
3843 addrlist->transport_return = PANIC;
3844 return FALSE; /* Only top address has status */
3847 DEBUG(D_transport) debug_printf("using the transport's hosts: %s\n",
3850 /* If the transport's host list contains no '$' characters, and we are not
3851 randomizing, it is fixed and therefore a chain of hosts can be built once
3852 and for all, and remembered for subsequent use by other calls to this
3853 transport. If, on the other hand, the host list does contain '$', or we are
3854 randomizing its order, we have to rebuild it each time. In the fixed case,
3855 as the hosts string will never be used again, it doesn't matter that we
3856 replace all the : characters with zeros. */
3860 uschar *s = ob->hosts;
3862 if (Ustrchr(s, '$') != NULL)
3864 if (!(expanded_hosts = expand_string(s)))
3866 addrlist->message = string_sprintf("failed to expand list of hosts "
3867 "\"%s\" in %s transport: %s", s, tblock->name, expand_string_message);
3868 addrlist->transport_return = search_find_defer ? DEFER : PANIC;
3869 return FALSE; /* Only top address has status */
3871 DEBUG(D_transport) debug_printf("expanded list of hosts \"%s\" to "
3872 "\"%s\"\n", s, expanded_hosts);
3876 if (ob->hosts_randomize) s = expanded_hosts = string_copy(s);
3878 host_build_hostlist(&hostlist, s, ob->hosts_randomize);
3880 /* Check that the expansion yielded something useful. */
3884 string_sprintf("%s transport has empty hosts setting", tblock->name);
3885 addrlist->transport_return = PANIC;
3886 return FALSE; /* Only top address has status */
3889 /* If there was no expansion of hosts, save the host list for
3892 if (!expanded_hosts) ob->hostlist = hostlist;
3895 /* This is not the first time this transport has been run in this delivery;
3896 the host list was built previously. */
3899 hostlist = ob->hostlist;
3902 /* The host list was supplied with the address. If hosts_randomize is set, we
3903 must sort it into a random order if it did not come from MX records and has not
3904 already been randomized (but don't bother if continuing down an existing
3907 else if (ob->hosts_randomize && hostlist->mx == MX_NONE && !continue_hostname)
3909 host_item *newlist = NULL;
3912 host_item *h = hostlist;
3913 hostlist = hostlist->next;
3915 h->sort_key = random_number(100);
3922 else if (h->sort_key < newlist->sort_key)
3929 host_item *hh = newlist;
3932 if (h->sort_key < hh->next->sort_key) break;
3940 hostlist = addrlist->host_list = newlist;
3943 /* Sort out the default port. */
3945 if (!smtp_get_port(ob->port, addrlist, &defport, tid)) return FALSE;
3947 /* For each host-plus-IP-address on the list:
3949 . If this is a continued delivery and the host isn't the one with the
3950 current connection, skip.
3952 . If the status is unusable (i.e. previously failed or retry checked), skip.
3954 . If no IP address set, get the address, either by turning the name into
3955 an address, calling gethostbyname if gethostbyname is on, or by calling
3956 the DNS. The DNS may yield multiple addresses, in which case insert the
3957 extra ones into the list.
3959 . Get the retry data if not previously obtained for this address and set the
3960 field which remembers the state of this address. Skip if the retry time is
3961 not reached. If not, remember whether retry data was found. The retry string
3962 contains both the name and the IP address.
3964 . Scan the list of addresses and mark those whose status is DEFER as
3965 PENDING_DEFER. These are the only ones that will be processed in this cycle
3968 . Make a delivery attempt - addresses marked PENDING_DEFER will be tried.
3969 Some addresses may be successfully delivered, others may fail, and yet
3970 others may get temporary errors and so get marked DEFER.
3972 . The return from the delivery attempt is OK if a connection was made and a
3973 valid SMTP dialogue was completed. Otherwise it is DEFER.
3975 . If OK, add a "remove" retry item for this host/IPaddress, if any.
3977 . If fail to connect, or other defer state, add a retry item.
3979 . If there are any addresses whose status is still DEFER, carry on to the
3980 next host/IPaddress, unless we have tried the number of hosts given
3981 by hosts_max_try or hosts_max_try_hardlimit; otherwise return. Note that
3982 there is some fancy logic for hosts_max_try that means its limit can be
3983 overstepped in some circumstances.
3985 If we get to the end of the list, all hosts have deferred at least one address,
3986 or not reached their retry times. If delay_after_cutoff is unset, it requests a
3987 delivery attempt to those hosts whose last try was before the arrival time of
3988 the current message. To cope with this, we have to go round the loop a second
3989 time. After that, set the status and error data for any addresses that haven't
3990 had it set already. */
3992 for (cutoff_retry = 0;
3993 expired && cutoff_retry < (ob->delay_after_cutoff ? 1 : 2);
3996 host_item *nexthost = NULL;
3997 int unexpired_hosts_tried = 0;
3998 BOOL continue_host_tried = FALSE;
4000 retry_non_continued:
4001 for (host = hostlist;
4003 && unexpired_hosts_tried < ob->hosts_max_try
4004 && total_hosts_tried < ob->hosts_max_try_hardlimit;
4010 BOOL host_is_expired = FALSE;
4011 BOOL message_defer = FALSE;
4012 BOOL some_deferred = FALSE;
4013 address_item *first_addr = NULL;
4014 uschar *interface = NULL;
4015 uschar *retry_host_key = NULL;
4016 uschar *retry_message_key = NULL;
4017 uschar *serialize_key = NULL;
4019 /* Default next host is next host. :-) But this can vary if the
4020 hosts_max_try limit is hit (see below). It may also be reset if a host
4021 address is looked up here (in case the host was multihomed). */
4023 nexthost = host->next;
4025 /* If the address hasn't yet been obtained from the host name, look it up
4026 now, unless the host is already marked as unusable. If it is marked as
4027 unusable, it means that the router was unable to find its IP address (in
4028 the DNS or wherever) OR we are in the 2nd time round the cutoff loop, and
4029 the lookup failed last time. We don't get this far if *all* MX records
4030 point to non-existent hosts; that is treated as a hard error.
4032 We can just skip this host entirely. When the hosts came from the router,
4033 the address will timeout based on the other host(s); when the address is
4034 looked up below, there is an explicit retry record added.
4036 Note that we mustn't skip unusable hosts if the address is not unset; they
4037 may be needed as expired hosts on the 2nd time round the cutoff loop. */
4041 int new_port, flags;
4044 if (host->status >= hstatus_unusable)
4046 DEBUG(D_transport) debug_printf("%s has no address and is unusable - skipping\n",
4051 DEBUG(D_transport) debug_printf("getting address for %s\n", host->name);
4053 /* The host name is permitted to have an attached port. Find it, and
4054 strip it from the name. Just remember it for now. */
4056 new_port = host_item_get_port(host);
4058 /* Count hosts looked up */
4062 /* Find by name if so configured, or if it's an IP address. We don't
4063 just copy the IP address, because we need the test-for-local to happen. */
4065 flags = HOST_FIND_BY_A | HOST_FIND_BY_AAAA;
4066 if (ob->dns_qualify_single) flags |= HOST_FIND_QUALIFY_SINGLE;
4067 if (ob->dns_search_parents) flags |= HOST_FIND_SEARCH_PARENTS;
4069 if (ob->gethostbyname || string_is_ip_address(host->name, NULL) != 0)
4070 rc = host_find_byname(host, NULL, flags, NULL, TRUE);
4072 rc = host_find_bydns(host, NULL, flags, NULL, NULL, NULL,
4073 &ob->dnssec, /* domains for request/require */
4076 /* Update the host (and any additional blocks, resulting from
4077 multihoming) with a host-specific port, if any. */
4079 for (hh = host; hh != nexthost; hh = hh->next) hh->port = new_port;
4081 /* Failure to find the host at this time (usually DNS temporary failure)
4082 is really a kind of routing failure rather than a transport failure.
4083 Therefore we add a retry item of the routing kind, not to stop us trying
4084 to look this name up here again, but to ensure the address gets timed
4085 out if the failures go on long enough. A complete failure at this point
4086 commonly points to a configuration error, but the best action is still
4087 to carry on for the next host. */
4089 if (rc == HOST_FIND_AGAIN || rc == HOST_FIND_SECURITY || rc == HOST_FIND_FAILED)
4091 retry_add_item(addrlist, string_sprintf("R:%s", host->name), 0);
4093 if (rc == HOST_FIND_AGAIN) hosts_defer++; else hosts_fail++;
4094 DEBUG(D_transport) debug_printf("rc = %s for %s\n", (rc == HOST_FIND_AGAIN)?
4095 "HOST_FIND_AGAIN" : "HOST_FIND_FAILED", host->name);
4096 host->status = hstatus_unusable;
4098 for (addr = addrlist; addr; addr = addr->next)
4100 if (addr->transport_return != DEFER) continue;
4101 addr->basic_errno = ERRNO_UNKNOWNHOST;
4102 addr->message = string_sprintf(
4103 rc == HOST_FIND_SECURITY
4104 ? "lookup of IP address for %s was insecure"
4105 : "failed to lookup IP address for %s",
4111 /* If the host is actually the local host, we may have a problem, or
4112 there may be some cunning configuration going on. In the problem case,
4113 log things and give up. The default transport status is already DEFER. */
4115 if (rc == HOST_FOUND_LOCAL && !ob->allow_localhost)
4117 for (addr = addrlist; addr; addr = addr->next)
4119 addr->basic_errno = 0;
4120 addr->message = string_sprintf("%s transport found host %s to be "
4121 "local", tblock->name, host->name);
4125 } /* End of block for IP address lookup */
4127 /* If this is a continued delivery, we are interested only in the host
4128 which matches the name of the existing open channel. The check is put
4129 here after the local host lookup, in case the name gets expanded as a
4130 result of the lookup. Set expired FALSE, to save the outer loop executing
4133 if (continue_hostname)
4134 if ( Ustrcmp(continue_hostname, host->name) != 0
4135 || Ustrcmp(continue_host_address, host->address) != 0
4139 continue; /* With next host */
4142 continue_host_tried = TRUE;
4144 /* Reset the default next host in case a multihomed host whose addresses
4145 are not looked up till just above added to the host list. */
4147 nexthost = host->next;
4149 /* If queue_smtp is set (-odqs or the first part of a 2-stage run), or the
4150 domain is in queue_smtp_domains, we don't actually want to attempt any
4151 deliveries. When doing a queue run, queue_smtp_domains is always unset. If
4152 there is a lookup defer in queue_smtp_domains, proceed as if the domain
4153 were not in it. We don't want to hold up all SMTP deliveries! Except when
4154 doing a two-stage queue run, don't do this if forcing. */
4156 if ((!deliver_force || queue_2stage) && (queue_smtp ||
4157 match_isinlist(addrlist->domain,
4158 (const uschar **)&queue_smtp_domains, 0,
4159 &domainlist_anchor, NULL, MCL_DOMAIN, TRUE, NULL) == OK))
4162 for (addr = addrlist; addr; addr = addr->next)
4163 if (addr->transport_return == DEFER)
4164 addr->message = US"domain matches queue_smtp_domains, or -odqs set";
4165 continue; /* With next host */
4168 /* Count hosts being considered - purely for an intelligent comment
4169 if none are usable. */
4173 /* Set $host and $host address now in case they are needed for the
4174 interface expansion or the serialize_hosts check; they remain set if an
4175 actual delivery happens. */
4177 deliver_host = host->name;
4178 deliver_host_address = host->address;
4179 lookup_dnssec_authenticated = host->dnssec == DS_YES ? US"yes"
4180 : host->dnssec == DS_NO ? US"no"
4183 /* Set up a string for adding to the retry key if the port number is not
4184 the standard SMTP port. A host may have its own port setting that overrides
4187 pistring = string_sprintf(":%d", host->port == PORT_NONE
4188 ? defport : host->port);
4189 if (Ustrcmp(pistring, ":25") == 0) pistring = US"";
4191 /* Select IPv4 or IPv6, and choose an outgoing interface. If the interface
4192 string is set, even if constant (as different transports can have different
4193 constant settings), we must add it to the key that is used for retries,
4194 because connections to the same host from a different interface should be
4195 treated separately. */
4197 host_af = Ustrchr(host->address, ':') == NULL ? AF_INET : AF_INET6;
4198 if ((rs = ob->interface) && *rs)
4200 if (!smtp_get_interface(rs, host_af, addrlist, &interface, tid))
4202 pistring = string_sprintf("%s/%s", pistring, interface);
4205 /* The first time round the outer loop, check the status of the host by
4206 inspecting the retry data. The second time round, we are interested only
4207 in expired hosts that haven't been tried since this message arrived. */
4209 if (cutoff_retry == 0)
4212 /* Ensure the status of the address is set by checking retry data if
4213 necessary. There may be host-specific retry data (applicable to all
4214 messages) and also data for retries of a specific message at this host.
4215 If either of these retry records are actually read, the keys used are
4216 returned to save recomputing them later. */
4218 if (exp_bool(addrlist, US"transport", tblock->name, D_transport,
4219 US"retry_include_ip_address", ob->retry_include_ip_address,
4220 ob->expand_retry_include_ip_address, &incl_ip) != OK)
4221 continue; /* with next host */
4223 host_is_expired = retry_check_address(addrlist->domain, host, pistring,
4224 incl_ip, &retry_host_key, &retry_message_key);
4226 DEBUG(D_transport) debug_printf("%s [%s]%s retry-status = %s\n", host->name,
4227 (host->address == NULL)? US"" : host->address, pistring,
4228 (host->status == hstatus_usable)? "usable" :
4229 (host->status == hstatus_unusable)? "unusable" :
4230 (host->status == hstatus_unusable_expired)? "unusable (expired)" : "?");
4232 /* Skip this address if not usable at this time, noting if it wasn't
4233 actually expired, both locally and in the address. */
4235 switch (host->status)
4237 case hstatus_unusable:
4239 setflag(addrlist, af_retry_skipped);
4242 case hstatus_unusable_expired:
4245 case hwhy_retry: hosts_retry++; break;
4246 case hwhy_failed: hosts_fail++; break;
4248 case hwhy_deferred: hosts_defer++; break;
4251 /* If there was a retry message key, implying that previously there
4252 was a message-specific defer, we don't want to update the list of
4253 messages waiting for these hosts. */
4255 if (retry_message_key) update_waiting = FALSE;
4256 continue; /* With the next host or IP address */
4260 /* Second time round the loop: if the address is set but expired, and
4261 the message is newer than the last try, let it through. */
4266 || host->status != hstatus_unusable_expired
4267 || host->last_try > received_time.tv_sec)
4269 DEBUG(D_transport) debug_printf("trying expired host %s [%s]%s\n",
4270 host->name, host->address, pistring);
4271 host_is_expired = TRUE;
4274 /* Setting "expired=FALSE" doesn't actually mean not all hosts are expired;
4275 it remains TRUE only if all hosts are expired and none are actually tried.
4280 /* If this host is listed as one to which access must be serialized,
4281 see if another Exim process has a connection to it, and if so, skip
4282 this host. If not, update the database to record our connection to it
4283 and remember this for later deletion. Do not do any of this if we are
4284 sending the message down a pre-existing connection. */
4286 if ( !continue_hostname
4287 && verify_check_given_host(&ob->serialize_hosts, host) == OK)
4289 serialize_key = string_sprintf("host-serialize-%s", host->name);
4290 if (!enq_start(serialize_key, 1))
4293 debug_printf("skipping host %s because another Exim process "
4294 "is connected to it\n", host->name);
4300 /* OK, we have an IP address that is not waiting for its retry time to
4301 arrive (it might be expired) OR (second time round the loop) we have an
4302 expired host that hasn't been tried since the message arrived. Have a go
4303 at delivering the message to it. First prepare the addresses by flushing
4304 out the result of previous attempts, and finding the first address that
4305 is still to be delivered. */
4307 first_addr = prepare_addresses(addrlist, host);
4309 DEBUG(D_transport) debug_printf("delivering %s to %s [%s] (%s%s)\n",
4310 message_id, host->name, host->address, addrlist->address,
4311 addrlist->next ? ", ..." : "");
4313 set_process_info("delivering %s to %s [%s] (%s%s)",
4314 message_id, host->name, host->address, addrlist->address,
4315 addrlist->next ? ", ..." : "");
4317 /* This is not for real; don't do the delivery. If there are
4318 any remaining hosts, list them. */
4323 set_errno_nohost(addrlist, 0, NULL, OK, FALSE);
4324 for (addr = addrlist; addr; addr = addr->next)
4326 addr->host_used = host;
4327 addr->special_action = '*';
4328 addr->message = US"delivery bypassed by -N option";
4332 debug_printf("*** delivery by %s transport bypassed by -N option\n"
4333 "*** host and remaining hosts:\n", tblock->name);
4334 for (host2 = host; host2; host2 = host2->next)
4335 debug_printf(" %s [%s]\n", host2->name,
4336 host2->address ? host2->address : US"unset");
4341 /* This is for real. If the host is expired, we don't count it for
4342 hosts_max_retry. This ensures that all hosts must expire before an address
4343 is timed out, unless hosts_max_try_hardlimit (which protects against
4344 lunatic DNS configurations) is reached.
4346 If the host is not expired and we are about to hit the hosts_max_retry
4347 limit, check to see if there is a subsequent hosts with a different MX
4348 value. If so, make that the next host, and don't count this one. This is a
4349 heuristic to make sure that different MXs do get tried. With a normal kind
4350 of retry rule, they would get tried anyway when the earlier hosts were
4351 delayed, but if the domain has a "retry every time" type of rule - as is
4352 often used for the the very large ISPs, that won't happen. */
4357 /* Make a copy of the host if it is local to this invocation
4358 of the transport. */
4362 thost = store_get(sizeof(host_item));
4364 thost->name = string_copy(host->name);
4365 thost->address = string_copy(host->address);
4370 if (!host_is_expired && ++unexpired_hosts_tried >= ob->hosts_max_try)
4374 debug_printf("hosts_max_try limit reached with this host\n");
4375 for (h = host; h; h = h->next) if (h->mx != host->mx)
4378 unexpired_hosts_tried--;
4379 DEBUG(D_transport) debug_printf("however, a higher MX host exists "
4380 "and will be tried\n");
4385 /* Attempt the delivery. */
4387 total_hosts_tried++;
4388 rc = smtp_deliver(addrlist, thost, host_af, defport, interface, tblock,
4389 &message_defer, FALSE);
4392 OK => connection made, each address contains its result;
4393 message_defer is set for message-specific defers (when all
4394 recipients are marked defer)
4395 DEFER => there was a non-message-specific delivery problem;
4396 ERROR => there was a problem setting up the arguments for a filter,
4397 or there was a problem with expanding added headers
4400 /* If the result is not OK, there was a non-message-specific problem.
4401 If the result is DEFER, we need to write to the logs saying what happened
4402 for this particular host, except in the case of authentication and TLS
4403 failures, where the log has already been written. If all hosts defer a
4404 general message is written at the end. */
4406 if (rc == DEFER && first_addr->basic_errno != ERRNO_AUTHFAIL
4407 && first_addr->basic_errno != ERRNO_TLSFAILURE)
4408 write_logs(host, first_addr->message, first_addr->basic_errno);
4410 #ifndef DISABLE_EVENT
4412 deferred_event_raise(first_addr, host);
4415 /* If STARTTLS was accepted, but there was a failure in setting up the
4416 TLS session (usually a certificate screwup), and the host is not in
4417 hosts_require_tls, and tls_tempfail_tryclear is true, try again, with
4418 TLS forcibly turned off. We have to start from scratch with a new SMTP
4419 connection. That's why the retry is done from here, not from within
4420 smtp_deliver(). [Rejections of STARTTLS itself don't screw up the
4421 session, so the in-clear transmission after those errors, if permitted,
4422 happens inside smtp_deliver().] */
4426 && first_addr->basic_errno == ERRNO_TLSFAILURE
4427 && ob->tls_tempfail_tryclear
4428 && verify_check_given_host(&ob->hosts_require_tls, host) != OK
4431 log_write(0, LOG_MAIN,
4432 "%s: delivering unencrypted to H=%s [%s] (not in hosts_require_tls)",
4433 first_addr->message, host->name, host->address);
4434 first_addr = prepare_addresses(addrlist, host);
4435 rc = smtp_deliver(addrlist, thost, host_af, defport, interface, tblock,
4436 &message_defer, TRUE);
4437 if (rc == DEFER && first_addr->basic_errno != ERRNO_AUTHFAIL)
4438 write_logs(host, first_addr->message, first_addr->basic_errno);
4439 # ifndef DISABLE_EVENT
4441 deferred_event_raise(first_addr, host);
4444 #endif /*SUPPORT_TLS*/
4447 /* Delivery attempt finished */
4449 rs = rc == OK ? US"OK"
4450 : rc == DEFER ? US"DEFER"
4451 : rc == ERROR ? US"ERROR"
4454 set_process_info("delivering %s: just tried %s [%s] for %s%s: result %s",
4455 message_id, host->name, host->address, addrlist->address,
4456 addrlist->next ? " (& others)" : "", rs);
4458 /* Release serialization if set up */
4460 if (serialize_key) enq_end(serialize_key);
4462 /* If the result is DEFER, or if a host retry record is known to exist, we
4463 need to add an item to the retry chain for updating the retry database
4464 at the end of delivery. We only need to add the item to the top address,
4465 of course. Also, if DEFER, we mark the IP address unusable so as to skip it
4466 for any other delivery attempts using the same address. (It is copied into
4467 the unusable tree at the outer level, so even if different address blocks
4468 contain the same address, it still won't get tried again.) */
4470 if (rc == DEFER || retry_host_key)
4472 int delete_flag = rc != DEFER ? rf_delete : 0;
4473 if (!retry_host_key)
4476 if (exp_bool(addrlist, US"transport", tblock->name, D_transport,
4477 US"retry_include_ip_address", ob->retry_include_ip_address,
4478 ob->expand_retry_include_ip_address, &incl_ip) != OK)
4479 incl_ip = TRUE; /* error; use most-specific retry record */
4481 retry_host_key = incl_ip
4482 ? string_sprintf("T:%S:%s%s", host->name, host->address, pistring)
4483 : string_sprintf("T:%S%s", host->name, pistring);
4486 /* If a delivery of another message over an existing SMTP connection
4487 yields DEFER, we do NOT set up retry data for the host. This covers the
4488 case when there are delays in routing the addresses in the second message
4489 that are so long that the server times out. This is alleviated by not
4490 routing addresses that previously had routing defers when handling an
4491 existing connection, but even so, this case may occur (e.g. if a
4492 previously happily routed address starts giving routing defers). If the
4493 host is genuinely down, another non-continued message delivery will
4494 notice it soon enough. */
4496 if (delete_flag != 0 || !continue_hostname)
4497 retry_add_item(first_addr, retry_host_key, rf_host | delete_flag);
4499 /* We may have tried an expired host, if its retry time has come; ensure
4500 the status reflects the expiry for the benefit of any other addresses. */
4504 host->status = host_is_expired
4505 ? hstatus_unusable_expired : hstatus_unusable;
4506 host->why = hwhy_deferred;
4510 /* If message_defer is set (host was OK, but every recipient got deferred
4511 because of some message-specific problem), or if that had happened
4512 previously so that a message retry key exists, add an appropriate item
4513 to the retry chain. Note that if there was a message defer but now there is
4514 a host defer, the message defer record gets deleted. That seems perfectly
4515 reasonable. Also, stop the message from being remembered as waiting
4516 for specific hosts. */
4518 if (message_defer || retry_message_key)
4520 int delete_flag = message_defer ? 0 : rf_delete;
4521 if (!retry_message_key)
4524 if (exp_bool(addrlist, US"transport", tblock->name, D_transport,
4525 US"retry_include_ip_address", ob->retry_include_ip_address,
4526 ob->expand_retry_include_ip_address, &incl_ip) != OK)
4527 incl_ip = TRUE; /* error; use most-specific retry record */
4529 retry_message_key = incl_ip
4530 ? string_sprintf("T:%S:%s%s:%s", host->name, host->address, pistring,
4532 : string_sprintf("T:%S%s:%s", host->name, pistring, message_id);
4534 retry_add_item(addrlist, retry_message_key,
4535 rf_message | rf_host | delete_flag);
4536 update_waiting = FALSE;
4539 /* Any return other than DEFER (that is, OK or ERROR) means that the
4540 addresses have got their final statuses filled in for this host. In the OK
4541 case, see if any of them are deferred. */
4544 for (addr = addrlist; addr; addr = addr->next)
4545 if (addr->transport_return == DEFER)
4547 some_deferred = TRUE;
4551 /* If no addresses deferred or the result was ERROR, return. We do this for
4552 ERROR because a failing filter set-up or add_headers expansion is likely to
4553 fail for any host we try. */
4555 if (rc == ERROR || (rc == OK && !some_deferred))
4557 DEBUG(D_transport) debug_printf("Leaving %s transport\n", tblock->name);
4558 return TRUE; /* Each address has its status */
4561 /* If the result was DEFER or some individual addresses deferred, let
4562 the loop run to try other hosts with the deferred addresses, except for the
4563 case when we were trying to deliver down an existing channel and failed.
4564 Don't try any other hosts in this case. */
4566 if (continue_hostname) break;
4568 /* If the whole delivery, or some individual addresses, were deferred and
4569 there are more hosts that could be tried, do not count this host towards
4570 the hosts_max_try limit if the age of the message is greater than the
4571 maximum retry time for this host. This means we may try try all hosts,
4572 ignoring the limit, when messages have been around for some time. This is
4573 important because if we don't try all hosts, the address will never time
4574 out. NOTE: this does not apply to hosts_max_try_hardlimit. */
4576 if ((rc == DEFER || some_deferred) && nexthost)
4579 retry_config *retry = retry_find_config(host->name, NULL, 0, 0);
4581 if (retry && retry->rules)
4583 retry_rule *last_rule;
4584 for (last_rule = retry->rules;
4586 last_rule = last_rule->next);
4587 timedout = time(NULL) - received_time.tv_sec > last_rule->timeout;
4589 else timedout = TRUE; /* No rule => timed out */
4593 unexpired_hosts_tried--;
4594 DEBUG(D_transport) debug_printf("temporary delivery error(s) override "
4595 "hosts_max_try (message older than host's retry time)\n");
4598 } /* End of loop for trying multiple hosts. */
4600 /* If we failed to find a matching host in the list, for an already-open
4601 connection, just close it and start over with the list. This can happen
4602 for routing that changes from run to run, or big multi-IP sites with
4605 if (continue_hostname && !continue_host_tried)
4607 int fd = cutthrough.fd >= 0 ? cutthrough.fd : 0;
4609 DEBUG(D_transport) debug_printf("no hosts match already-open connection\n");
4611 if (tls_out.active == fd)
4613 (void) tls_write(FALSE, US"QUIT\r\n", 6, FALSE);
4614 tls_close(FALSE, TLS_SHUTDOWN_NOWAIT);
4618 (void) write(fd, US"QUIT\r\n", 6);
4622 continue_hostname = NULL;
4623 goto retry_non_continued;
4626 /* This is the end of the loop that repeats iff expired is TRUE and
4627 ob->delay_after_cutoff is FALSE. The second time round we will
4628 try those hosts that haven't been tried since the message arrived. */
4632 debug_printf("all IP addresses skipped or deferred at least one address\n");
4633 if (expired && !ob->delay_after_cutoff && cutoff_retry == 0)
4634 debug_printf("retrying IP addresses not tried since message arrived\n");
4639 /* Get here if all IP addresses are skipped or defer at least one address. In
4640 MUA wrapper mode, this will happen only for connection or other non-message-
4641 specific failures. Force the delivery status for all addresses to FAIL. */
4645 for (addr = addrlist; addr; addr = addr->next)
4646 addr->transport_return = FAIL;
4650 /* In the normal, non-wrapper case, add a standard message to each deferred
4651 address if there hasn't been an error, that is, if it hasn't actually been
4652 tried this time. The variable "expired" will be FALSE if any deliveries were
4653 actually tried, or if there was at least one host that was not expired. That
4654 is, it is TRUE only if no deliveries were tried and all hosts were expired. If
4655 a delivery has been tried, an error code will be set, and the failing of the
4656 message is handled by the retry code later.
4658 If queue_smtp is set, or this transport was called to send a subsequent message
4659 down an existing TCP/IP connection, and something caused the host not to be
4660 found, we end up here, but can detect these cases and handle them specially. */
4662 for (addr = addrlist; addr; addr = addr->next)
4664 /* If host is not NULL, it means that we stopped processing the host list
4665 because of hosts_max_try or hosts_max_try_hardlimit. In the former case, this
4666 means we need to behave as if some hosts were skipped because their retry
4667 time had not come. Specifically, this prevents the address from timing out.
4668 However, if we have hit hosts_max_try_hardlimit, we want to behave as if all
4669 hosts were tried. */
4672 if (total_hosts_tried >= ob->hosts_max_try_hardlimit)
4675 debug_printf("hosts_max_try_hardlimit reached: behave as if all "
4676 "hosts were tried\n");
4681 debug_printf("hosts_max_try limit caused some hosts to be skipped\n");
4682 setflag(addr, af_retry_skipped);
4685 if (queue_smtp) /* no deliveries attempted */
4687 addr->transport_return = DEFER;
4688 addr->basic_errno = 0;
4689 addr->message = US"SMTP delivery explicitly queued";
4692 else if ( addr->transport_return == DEFER
4693 && (addr->basic_errno == ERRNO_UNKNOWNERROR || addr->basic_errno == 0)
4697 addr->basic_errno = ERRNO_HRETRY;
4698 if (continue_hostname)
4699 addr->message = US"no host found for existing SMTP connection";
4702 setflag(addr, af_pass_message); /* This is not a security risk */
4703 addr->message = string_sprintf(
4704 "all hosts%s have been failing for a long time %s",
4705 addr->domain ? string_sprintf(" for '%s'", addr->domain) : US"",
4706 ob->delay_after_cutoff
4707 ? US"(and retry time not reached)"
4708 : US"and were last tried after this message arrived");
4710 /* If we are already using fallback hosts, or there are no fallback hosts
4711 defined, convert the result to FAIL to cause a bounce. */
4713 if (addr->host_list == addr->fallback_hosts || !addr->fallback_hosts)
4714 addr->transport_return = FAIL;
4719 if (hosts_retry == hosts_total)
4720 s = "retry time not reached for any host%s";
4721 else if (hosts_fail == hosts_total)
4722 s = "all host address lookups%s failed permanently";
4723 else if (hosts_defer == hosts_total)
4724 s = "all host address lookups%s failed temporarily";
4725 else if (hosts_serial == hosts_total)
4726 s = "connection limit reached for all hosts%s";
4727 else if (hosts_fail+hosts_defer == hosts_total)
4728 s = "all host address lookups%s failed";
4730 s = "some host address lookups failed and retry time "
4731 "not reached for other hosts or connection limit reached%s";
4733 addr->message = string_sprintf(s,
4734 addr->domain ? string_sprintf(" for '%s'", addr->domain) : US"");
4739 /* Update the database which keeps information about which messages are waiting
4740 for which hosts to become available. For some message-specific errors, the
4741 update_waiting flag is turned off because we don't want follow-on deliveries in
4742 those cases. If this transport instance is explicitly limited to one message
4743 per connection then follow-on deliveries are not possible and there's no need
4744 to create/update the per-transport wait-<transport_name> database. */
4746 if (update_waiting && tblock->connection_max_messages != 1)
4747 transport_update_waiting(hostlist, tblock->name);
4751 DEBUG(D_transport) debug_printf("Leaving %s transport\n", tblock->name);
4753 return TRUE; /* Each address has its status */
4756 #endif /*!MACRO_PREDEF*/
4759 /* End of transport/smtp.c */