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 #ifdef EXPERIMENTAL_PIPE_CONNECT
110 { "hosts_pipe_connect", opt_stringptr,
111 (void *)offsetof(smtp_transport_options_block, hosts_pipe_connect) },
113 { "hosts_randomize", opt_bool,
114 (void *)offsetof(smtp_transport_options_block, hosts_randomize) },
115 #if defined(SUPPORT_TLS) && !defined(DISABLE_OCSP)
116 { "hosts_request_ocsp", opt_stringptr,
117 (void *)offsetof(smtp_transport_options_block, hosts_request_ocsp) },
119 { "hosts_require_auth", opt_stringptr,
120 (void *)offsetof(smtp_transport_options_block, hosts_require_auth) },
123 { "hosts_require_dane", opt_stringptr,
124 (void *)offsetof(smtp_transport_options_block, hosts_require_dane) },
126 # ifndef DISABLE_OCSP
127 { "hosts_require_ocsp", opt_stringptr,
128 (void *)offsetof(smtp_transport_options_block, hosts_require_ocsp) },
130 { "hosts_require_tls", opt_stringptr,
131 (void *)offsetof(smtp_transport_options_block, hosts_require_tls) },
133 { "hosts_try_auth", opt_stringptr,
134 (void *)offsetof(smtp_transport_options_block, hosts_try_auth) },
135 { "hosts_try_chunking", opt_stringptr,
136 (void *)offsetof(smtp_transport_options_block, hosts_try_chunking) },
137 #if defined(SUPPORT_TLS) && defined(SUPPORT_DANE)
138 { "hosts_try_dane", opt_stringptr,
139 (void *)offsetof(smtp_transport_options_block, hosts_try_dane) },
141 { "hosts_try_fastopen", opt_stringptr,
142 (void *)offsetof(smtp_transport_options_block, hosts_try_fastopen) },
144 { "hosts_try_prdr", opt_stringptr,
145 (void *)offsetof(smtp_transport_options_block, hosts_try_prdr) },
148 { "hosts_verify_avoid_tls", opt_stringptr,
149 (void *)offsetof(smtp_transport_options_block, hosts_verify_avoid_tls) },
151 { "interface", opt_stringptr,
152 (void *)offsetof(smtp_transport_options_block, interface) },
153 { "keepalive", opt_bool,
154 (void *)offsetof(smtp_transport_options_block, keepalive) },
155 { "lmtp_ignore_quota", opt_bool,
156 (void *)offsetof(smtp_transport_options_block, lmtp_ignore_quota) },
157 { "max_rcpt", opt_int | opt_public,
158 (void *)offsetof(transport_instance, max_addresses) },
159 { "multi_domain", opt_expand_bool | opt_public,
160 (void *)offsetof(transport_instance, multi_domain) },
161 { "port", opt_stringptr,
162 (void *)offsetof(smtp_transport_options_block, port) },
163 { "protocol", opt_stringptr,
164 (void *)offsetof(smtp_transport_options_block, protocol) },
165 { "retry_include_ip_address", opt_expand_bool,
166 (void *)offsetof(smtp_transport_options_block, retry_include_ip_address) },
167 { "serialize_hosts", opt_stringptr,
168 (void *)offsetof(smtp_transport_options_block, serialize_hosts) },
169 { "size_addition", opt_int,
170 (void *)offsetof(smtp_transport_options_block, size_addition) },
172 { "socks_proxy", opt_stringptr,
173 (void *)offsetof(smtp_transport_options_block, socks_proxy) },
176 { "tls_certificate", opt_stringptr,
177 (void *)offsetof(smtp_transport_options_block, tls_certificate) },
178 { "tls_crl", opt_stringptr,
179 (void *)offsetof(smtp_transport_options_block, tls_crl) },
180 { "tls_dh_min_bits", opt_int,
181 (void *)offsetof(smtp_transport_options_block, tls_dh_min_bits) },
182 { "tls_privatekey", opt_stringptr,
183 (void *)offsetof(smtp_transport_options_block, tls_privatekey) },
184 { "tls_require_ciphers", opt_stringptr,
185 (void *)offsetof(smtp_transport_options_block, tls_require_ciphers) },
186 { "tls_sni", opt_stringptr,
187 (void *)offsetof(smtp_transport_options_block, tls_sni) },
188 { "tls_tempfail_tryclear", opt_bool,
189 (void *)offsetof(smtp_transport_options_block, tls_tempfail_tryclear) },
190 { "tls_try_verify_hosts", opt_stringptr,
191 (void *)offsetof(smtp_transport_options_block, tls_try_verify_hosts) },
192 { "tls_verify_cert_hostnames", opt_stringptr,
193 (void *)offsetof(smtp_transport_options_block,tls_verify_cert_hostnames)},
194 { "tls_verify_certificates", opt_stringptr,
195 (void *)offsetof(smtp_transport_options_block, tls_verify_certificates) },
196 { "tls_verify_hosts", opt_stringptr,
197 (void *)offsetof(smtp_transport_options_block, tls_verify_hosts) },
200 { "utf8_downconvert", opt_stringptr,
201 (void *)offsetof(smtp_transport_options_block, utf8_downconvert) },
205 /* Size of the options list. An extern variable has to be used so that its
206 address can appear in the tables drtables.c. */
208 int smtp_transport_options_count = nelem(smtp_transport_options);
214 smtp_transport_options_block smtp_transport_option_defaults = {0};
215 void smtp_transport_init(transport_instance *tblock) {}
216 BOOL smtp_transport_entry(transport_instance *tblock, address_item *addr) {return FALSE;}
217 void smtp_transport_closedown(transport_instance *tblock) {}
219 #else /*!MACRO_PREDEF*/
222 /* Default private options block for the smtp transport. */
224 smtp_transport_options_block smtp_transport_option_defaults = {
226 .fallback_hosts = NULL,
228 .fallback_hostlist = NULL,
229 .helo_data = US"$primary_hostname",
232 .protocol = US"smtp",
234 .serialize_hosts = NULL,
235 .hosts_try_auth = NULL,
236 .hosts_require_auth = NULL,
237 .hosts_try_chunking = US"*",
239 .hosts_try_dane = NULL,
240 .hosts_require_dane = NULL,
241 .dane_require_tls_ciphers = NULL,
243 .hosts_try_fastopen = NULL,
245 .hosts_try_prdr = US"*",
248 .hosts_request_ocsp = US"*", /* hosts_request_ocsp (except under DANE; tls_client_start()) */
249 .hosts_require_ocsp = NULL,
251 .hosts_require_tls = NULL,
252 .hosts_avoid_tls = NULL,
253 .hosts_verify_avoid_tls = NULL,
254 .hosts_avoid_pipelining = NULL,
255 #ifdef EXPERIMENTAL_PIPE_CONNECT
256 .hosts_pipe_connect = NULL,
258 .hosts_avoid_esmtp = NULL,
260 .hosts_nopass_tls = NULL,
261 .hosts_noproxy_tls = US"*",
263 .command_timeout = 5*60,
264 .connect_timeout = 5*60,
265 .data_timeout = 5*60,
266 .final_timeout = 10*60,
267 .size_addition = 1024,
269 .hosts_max_try_hardlimit = 50,
270 .address_retry_include_sender = TRUE,
271 .allow_localhost = FALSE,
272 .authenticated_sender_force = FALSE,
273 .gethostbyname = FALSE,
274 .dns_qualify_single = TRUE,
275 .dns_search_parents = FALSE,
276 .dnssec = { .request=NULL, .require=NULL },
277 .delay_after_cutoff = TRUE,
278 .hosts_override = FALSE,
279 .hosts_randomize = FALSE,
281 .lmtp_ignore_quota = FALSE,
282 .expand_retry_include_ip_address = NULL,
283 .retry_include_ip_address = TRUE,
288 .tls_certificate = NULL,
290 .tls_privatekey = NULL,
291 .tls_require_ciphers = NULL,
293 .tls_verify_certificates = US"system",
294 .tls_dh_min_bits = EXIM_CLIENT_DH_DEFAULT_MIN_BITS,
295 .tls_tempfail_tryclear = TRUE,
296 .tls_verify_hosts = NULL,
297 .tls_try_verify_hosts = US"*",
298 .tls_verify_cert_hostnames = US"*",
301 .utf8_downconvert = NULL,
305 {.dkim_domain = NULL,
306 .dkim_identity = NULL,
307 .dkim_private_key = NULL,
308 .dkim_selector = NULL,
310 .dkim_sign_headers = NULL,
312 .dkim_hash = US"sha256",
313 .dkim_timestamps = NULL,
314 .dot_stuffed = FALSE,
315 .force_bodyhash = FALSE,
316 # ifdef EXPERIMENTAL_ARC
317 .arc_signspec = NULL,
320 # ifdef EXPERIMENTAL_ARC
326 /* some DSN flags for use later */
328 static int rf_list[] = {rf_notify_never, rf_notify_success,
329 rf_notify_failure, rf_notify_delay };
331 static uschar *rf_names[] = { US"NEVER", US"SUCCESS", US"FAILURE", US"DELAY" };
337 static uschar *smtp_command; /* Points to last cmd for error messages */
338 static uschar *mail_command; /* Points to MAIL cmd for error messages */
339 static uschar *data_command = US""; /* Points to DATA cmd for error messages */
340 static BOOL update_waiting; /* TRUE to update the "wait" database */
342 /*XXX move to smtp_context */
343 static BOOL pipelining_active; /* current transaction is in pipe mode */
346 static unsigned ehlo_response(uschar * buf, unsigned checks);
349 /*************************************************
350 * Setup entry point *
351 *************************************************/
353 /* This function is called when the transport is about to be used,
354 but before running it in a sub-process. It is used for two things:
356 (1) To set the fallback host list in addresses, when delivering.
357 (2) To pass back the interface, port, protocol, and other options, for use
358 during callout verification.
361 tblock pointer to the transport instance block
362 addrlist list of addresses about to be transported
363 tf if not NULL, pointer to block in which to return options
364 uid the uid that will be set (not used)
365 gid the gid that will be set (not used)
366 errmsg place for error message (not used)
368 Returns: OK always (FAIL, DEFER not used)
372 smtp_transport_setup(transport_instance *tblock, address_item *addrlist,
373 transport_feedback *tf, uid_t uid, gid_t gid, uschar **errmsg)
375 smtp_transport_options_block *ob = SOB tblock->options_block;
377 errmsg = errmsg; /* Keep picky compilers happy */
381 /* Pass back options if required. This interface is getting very messy. */
385 tf->interface = ob->interface;
387 tf->protocol = ob->protocol;
388 tf->hosts = ob->hosts;
389 tf->hosts_override = ob->hosts_override;
390 tf->hosts_randomize = ob->hosts_randomize;
391 tf->gethostbyname = ob->gethostbyname;
392 tf->qualify_single = ob->dns_qualify_single;
393 tf->search_parents = ob->dns_search_parents;
394 tf->helo_data = ob->helo_data;
397 /* Set the fallback host list for all the addresses that don't have fallback
398 host lists, provided that the local host wasn't present in the original host
401 if (!testflag(addrlist, af_local_host_removed))
402 for (; addrlist; addrlist = addrlist->next)
403 if (!addrlist->fallback_hosts) addrlist->fallback_hosts = ob->fallback_hostlist;
410 /*************************************************
411 * Initialization entry point *
412 *************************************************/
414 /* Called for each instance, after its options have been read, to
415 enable consistency checks to be done, or anything else that needs
418 Argument: pointer to the transport instance block
423 smtp_transport_init(transport_instance *tblock)
425 smtp_transport_options_block *ob = SOB tblock->options_block;
427 /* Retry_use_local_part defaults FALSE if unset */
429 if (tblock->retry_use_local_part == TRUE_UNSET)
430 tblock->retry_use_local_part = FALSE;
432 /* Set the default port according to the protocol */
435 ob->port = strcmpic(ob->protocol, US"lmtp") == 0
437 : strcmpic(ob->protocol, US"smtps") == 0
438 ? US"smtps" : US"smtp";
440 /* Set up the setup entry point, to be called before subprocesses for this
443 tblock->setup = smtp_transport_setup;
445 /* Complain if any of the timeouts are zero. */
447 if (ob->command_timeout <= 0 || ob->data_timeout <= 0 ||
448 ob->final_timeout <= 0)
449 log_write(0, LOG_PANIC_DIE|LOG_CONFIG,
450 "command, data, or final timeout value is zero for %s transport",
453 /* If hosts_override is set and there are local hosts, set the global
454 flag that stops verify from showing router hosts. */
456 if (ob->hosts_override && ob->hosts != NULL) tblock->overrides_hosts = TRUE;
458 /* If there are any fallback hosts listed, build a chain of host items
459 for them, but do not do any lookups at this time. */
461 host_build_hostlist(&(ob->fallback_hostlist), ob->fallback_hosts, FALSE);
468 /*************************************************
469 * Set delivery info into all active addresses *
470 *************************************************/
472 /* Only addresses whose status is >= PENDING are relevant. A lesser
473 status means that an address is not currently being processed.
476 addrlist points to a chain of addresses
477 errno_value to put in each address's errno field
478 msg to put in each address's message field
479 rc to put in each address's transport_return field
480 pass_message if TRUE, set the "pass message" flag in the address
481 host if set, mark addrs as having used this host
482 smtp_greeting from peer
483 helo_response from peer
485 If errno_value has the special value ERRNO_CONNECTTIMEOUT, ETIMEDOUT is put in
486 the errno field, and RTEF_CTOUT is ORed into the more_errno field, to indicate
487 this particular type of timeout.
493 set_errno(address_item *addrlist, int errno_value, uschar *msg, int rc,
494 BOOL pass_message, host_item * host
495 #ifdef EXPERIMENTAL_DSN_INFO
496 , const uschar * smtp_greeting, const uschar * helo_response
501 if (errno_value == ERRNO_CONNECTTIMEOUT)
503 errno_value = ETIMEDOUT;
504 orvalue = RTEF_CTOUT;
506 for (address_item * addr = addrlist; addr; addr = addr->next)
507 if (addr->transport_return >= PENDING)
509 addr->basic_errno = errno_value;
510 addr->more_errno |= orvalue;
514 if (pass_message) setflag(addr, af_pass_message);
516 addr->transport_return = rc;
519 addr->host_used = host;
520 #ifdef EXPERIMENTAL_DSN_INFO
522 {uschar * s = Ustrchr(smtp_greeting, '\n'); if (s) *s = '\0';}
523 addr->smtp_greeting = smtp_greeting;
526 {uschar * s = Ustrchr(helo_response, '\n'); if (s) *s = '\0';}
527 addr->helo_response = helo_response;
534 set_errno_nohost(address_item *addrlist, int errno_value, uschar *msg, int rc,
537 set_errno(addrlist, errno_value, msg, rc, pass_message, NULL
538 #ifdef EXPERIMENTAL_DSN_INFO
545 /*************************************************
546 * Check an SMTP response *
547 *************************************************/
549 /* This function is given an errno code and the SMTP response buffer
550 to analyse, together with the host identification for generating messages. It
551 sets an appropriate message and puts the first digit of the response code into
552 the yield variable. If no response was actually read, a suitable digit is
556 host the current host, to get its name for messages
557 errno_value pointer to the errno value
558 more_errno from the top address for use with ERRNO_FILTER_FAIL
559 buffer the SMTP response buffer
560 yield where to put a one-digit SMTP response code
561 message where to put an error message
562 pass_message set TRUE if message is an SMTP response
564 Returns: TRUE if an SMTP "QUIT" command should be sent, else FALSE
568 check_response(host_item *host, int *errno_value, int more_errno,
569 uschar *buffer, int *yield, uschar **message, BOOL *pass_message)
571 uschar * pl = pipelining_active ? US"pipelined " : US"";
574 *yield = '4'; /* Default setting is to give a temporary error */
578 case ETIMEDOUT: /* Handle response timeout */
579 *message = US string_sprintf("SMTP timeout after %s%s",
581 if (transport_count > 0)
582 *message = US string_sprintf("%s (%d bytes written)", *message,
586 case ERRNO_SMTPFORMAT: /* Handle malformed SMTP response */
587 s = string_printing(buffer);
588 while (isspace(*s)) s++;
590 ? string_sprintf("Malformed SMTP reply (an empty line) "
591 "in response to %s%s", pl, smtp_command)
592 : string_sprintf("Malformed SMTP reply in response to %s%s: %s",
593 pl, smtp_command, s);
596 case ERRNO_TLSFAILURE: /* Handle bad first read; can happen with
598 *message = US"bad first read from TLS conn";
601 case ERRNO_FILTER_FAIL: /* Handle a failed filter process error;
602 can't send QUIT as we mustn't end the DATA. */
603 *message = string_sprintf("transport filter process failed (%d)%s",
605 more_errno == EX_EXECFAILED ? ": unable to execute command" : "");
608 case ERRNO_CHHEADER_FAIL: /* Handle a failed add_headers expansion;
609 can't send QUIT as we mustn't end the DATA. */
611 string_sprintf("failed to expand headers_add or headers_remove: %s",
612 expand_string_message);
615 case ERRNO_WRITEINCOMPLETE: /* failure to write a complete data block */
616 *message = string_sprintf("failed to write a data block");
620 case ERRNO_UTF8_FWD: /* no advertised SMTPUTF8, for international message */
621 *message = US"utf8 support required but not offered for forwarding";
622 DEBUG(D_deliver|D_transport) debug_printf("%s\n", *message);
627 /* Handle error responses from the remote mailer. */
631 *message = string_sprintf("SMTP error from remote mail server after %s%s: "
632 "%s", pl, smtp_command, s = string_printing(buffer));
633 *pass_message = TRUE;
638 /* No data was read. If there is no errno, this must be the EOF (i.e.
639 connection closed) case, which causes deferral. An explicit connection reset
640 error has the same effect. Otherwise, put the host's identity in the message,
641 leaving the errno value to be interpreted as well. In all cases, we have to
642 assume the connection is now dead. */
644 if (*errno_value == 0 || *errno_value == ECONNRESET)
646 *errno_value = ERRNO_SMTPCLOSED;
647 *message = US string_sprintf("Remote host closed connection "
648 "in response to %s%s", pl, smtp_command);
651 *message = US string_sprintf("%s [%s]", host->name, host->address);
658 /*************************************************
659 * Write error message to logs *
660 *************************************************/
662 /* This writes to the main log and to the message log.
665 host the current host
666 detail the current message (addr_item->message)
667 basic_errno the errno (addr_item->basic_errno)
673 write_logs(const host_item *host, const uschar *suffix, int basic_errno)
675 gstring * message = LOGGING(outgoing_port)
676 ? string_fmt_append(NULL, "H=%s [%s]:%d", host->name, host->address,
677 host->port == PORT_NONE ? 25 : host->port)
678 : string_fmt_append(NULL, "H=%s [%s]", host->name, host->address);
682 message = string_fmt_append(message, ": %s", suffix);
684 message = string_fmt_append(message, ": %s", strerror(basic_errno));
687 message = string_fmt_append(message, " %s", exim_errstr(basic_errno));
689 log_write(0, LOG_MAIN, "%s", string_from_gstring(message));
690 deliver_msglog("%s %s\n", tod_stamp(tod_log), message->s);
694 msglog_line(host_item * host, uschar * message)
696 deliver_msglog("%s H=%s [%s] %s\n", tod_stamp(tod_log),
697 host->name, host->address, message);
702 #ifndef DISABLE_EVENT
703 /*************************************************
704 * Post-defer action *
705 *************************************************/
707 /* This expands an arbitrary per-transport string.
708 It might, for example, be used to write to the database log.
711 addr the address item containing error information
712 host the current host
718 deferred_event_raise(address_item *addr, host_item *host)
720 uschar * action = addr->transport->event_action;
721 const uschar * save_domain;
727 save_domain = deliver_domain;
728 save_local = deliver_localpart;
730 /*XXX would ip & port already be set up? */
731 deliver_host_address = string_copy(host->address);
732 deliver_host_port = host->port == PORT_NONE ? 25 : host->port;
733 event_defer_errno = addr->basic_errno;
735 router_name = addr->router->name;
736 transport_name = addr->transport->name;
737 deliver_domain = addr->domain;
738 deliver_localpart = addr->local_part;
740 (void) event_raise(action, US"msg:host:defer",
742 ? addr->basic_errno > 0
743 ? string_sprintf("%s: %s", addr->message, strerror(addr->basic_errno))
744 : string_copy(addr->message)
745 : addr->basic_errno > 0
746 ? string_copy(US strerror(addr->basic_errno))
749 deliver_localpart = save_local;
750 deliver_domain = save_domain;
751 router_name = transport_name = NULL;
755 /*************************************************
756 * Reap SMTP specific responses *
757 *************************************************/
759 smtp_discard_responses(smtp_context * sx, smtp_transport_options_block * ob,
762 uschar flushbuffer[4096];
766 if (!smtp_read_response(sx, flushbuffer, sizeof(flushbuffer),
767 '2', ob->command_timeout)
768 && (errno != 0 || flushbuffer[0] == 0))
775 /* Return boolean success */
778 smtp_reap_banner(smtp_context * sx)
780 BOOL good_response = smtp_read_response(sx, sx->buffer, sizeof(sx->buffer),
781 '2', (SOB sx->conn_args.ob)->command_timeout);
782 #ifdef EXPERIMENTAL_DSN_INFO
783 sx->smtp_greeting = string_copy(sx->buffer);
785 return good_response;
789 smtp_reap_ehlo(smtp_context * sx)
791 if (!smtp_read_response(sx, sx->buffer, sizeof(sx->buffer), '2',
792 (SOB sx->conn_args.ob)->command_timeout))
794 if (errno != 0 || sx->buffer[0] == 0 || sx->lmtp)
796 #ifdef EXPERIMENTAL_DSN_INFO
797 sx->helo_response = string_copy(sx->buffer);
803 #ifdef EXPERIMENTAL_DSN_INFO
804 sx->helo_response = string_copy(sx->buffer);
811 #ifdef EXPERIMENTAL_PIPE_CONNECT
813 ehlo_cache_key(const smtp_context * sx)
815 host_item * host = sx->conn_args.host;
816 return Ustrchr(host->address, ':')
817 ? string_sprintf("[%s]:%d.EHLO", host->address,
818 host->port == PORT_NONE ? sx->port : host->port)
819 : string_sprintf("%s:%d.EHLO", host->address,
820 host->port == PORT_NONE ? sx->port : host->port);
824 write_ehlo_cache_entry(const smtp_context * sx)
826 open_db dbblock, * dbm_file;
828 if ((dbm_file = dbfn_open(US"misc", O_RDWR, &dbblock, TRUE)))
830 uschar * ehlo_resp_key = ehlo_cache_key(sx);
831 dbdata_ehlo_resp er = { .data = sx->ehlo_resp };
833 HDEBUG(D_transport) debug_printf("writing clr %04x/%04x cry %04x/%04x\n",
834 sx->ehlo_resp.cleartext_features, sx->ehlo_resp.cleartext_auths,
835 sx->ehlo_resp.crypted_features, sx->ehlo_resp.crypted_auths);
837 dbfn_write(dbm_file, ehlo_resp_key, &er, (int)sizeof(er));
838 dbfn_close(dbm_file);
843 invalidate_ehlo_cache_entry(smtp_context * sx)
845 open_db dbblock, * dbm_file;
847 if ( sx->early_pipe_active
848 && (dbm_file = dbfn_open(US"misc", O_RDWR, &dbblock, TRUE)))
850 uschar * ehlo_resp_key = ehlo_cache_key(sx);
851 dbfn_delete(dbm_file, ehlo_resp_key);
852 dbfn_close(dbm_file);
857 read_ehlo_cache_entry(smtp_context * sx)
862 if (!(dbm_file = dbfn_open(US"misc", O_RDONLY, &dbblock, FALSE)))
863 { DEBUG(D_transport) debug_printf("ehlo-cache: no misc DB\n"); }
866 uschar * ehlo_resp_key = ehlo_cache_key(sx);
867 dbdata_ehlo_resp * er;
869 if (!(er = dbfn_read(dbm_file, ehlo_resp_key)))
870 { DEBUG(D_transport) debug_printf("no ehlo-resp record\n"); }
871 else if (time(NULL) - er->time_stamp > retry_data_expire)
873 DEBUG(D_transport) debug_printf("ehlo-resp record too old\n");
874 dbfn_close(dbm_file);
875 if ((dbm_file = dbfn_open(US"misc", O_RDWR, &dbblock, TRUE)))
876 dbfn_delete(dbm_file, ehlo_resp_key);
880 sx->ehlo_resp = er->data;
881 dbfn_close(dbm_file);
882 DEBUG(D_transport) debug_printf(
883 "EHLO response bits from cache: cleartext 0x%04x crypted 0x%04x\n",
884 er->data.cleartext_features, er->data.crypted_features);
887 dbfn_close(dbm_file);
894 /* Return an auths bitmap for the set of AUTH methods offered by the server
895 which match our authenticators. */
897 static unsigned short
898 study_ehlo_auths(smtp_context * sx)
903 unsigned short authbits = 0;
905 if (!sx->esmtp) return 0;
906 if (!regex_AUTH) regex_AUTH = regex_must_compile(AUTHS_REGEX, FALSE, TRUE);
907 if (!regex_match_and_setup(regex_AUTH, sx->buffer, 0, -1)) return 0;
908 expand_nmax = -1; /* reset */
909 names = string_copyn(expand_nstring[1], expand_nlength[1]);
911 for (au = auths, authnum = 0; au; au = au->next, authnum++) if (au->client)
913 const uschar * list = names;
917 while (string_nextinlist(&list, &sep, name, sizeof(name)))
918 if (strcmpic(au->public_name, name) == 0)
919 { authbits |= BIT(authnum); break; }
923 debug_printf("server offers %s AUTH, methods '%s', bitmap 0x%04x\n",
924 tls_out.active.sock >= 0 ? "crypted" : "plaintext", names, authbits);
926 if (tls_out.active.sock >= 0)
927 sx->ehlo_resp.crypted_auths = authbits;
929 sx->ehlo_resp.cleartext_auths = authbits;
936 /* Wait for and check responses for early-pipelining.
938 Called from the lower-level smtp_read_response() function
939 used for general code that assume synchronisation, if context
940 flags indicate outstanding early-pipelining commands. Also
941 called fom sync_responses() which handles pipelined commands.
944 sx smtp connection context
945 countp number of outstanding responses, adjusted on return
949 DEFER error on first read of TLS'd conn
950 FAIL SMTP error in response
953 smtp_reap_early_pipe(smtp_context * sx, int * countp)
955 BOOL pending_BANNER = sx->pending_BANNER;
956 BOOL pending_EHLO = sx->pending_EHLO;
959 sx->pending_BANNER = FALSE; /* clear early to avoid recursion */
960 sx->pending_EHLO = FALSE;
964 DEBUG(D_transport) debug_printf("%s expect banner\n", __FUNCTION__);
966 if (!smtp_reap_banner(sx))
968 DEBUG(D_transport) debug_printf("bad banner\n");
969 if (tls_out.active.sock >= 0) rc = DEFER;
976 unsigned peer_offered;
977 unsigned short authbits = 0, * ap;
979 DEBUG(D_transport) debug_printf("%s expect ehlo\n", __FUNCTION__);
981 if (!smtp_reap_ehlo(sx))
983 DEBUG(D_transport) debug_printf("bad response for EHLO\n");
984 if (tls_out.active.sock >= 0) rc = DEFER;
988 /* Compare the actual EHLO response to the cached value we assumed;
989 on difference, dump or rewrite the cache and arrange for a retry. */
991 ap = tls_out.active.sock < 0
992 ? &sx->ehlo_resp.cleartext_auths : &sx->ehlo_resp.crypted_auths;
994 peer_offered = ehlo_response(sx->buffer,
995 (tls_out.active.sock < 0 ? OPTION_TLS : 0)
996 | OPTION_CHUNKING | OPTION_PRDR | OPTION_DSN | OPTION_PIPE | OPTION_SIZE
997 | OPTION_UTF8 | OPTION_EARLY_PIPE
999 if ( peer_offered != sx->peer_offered
1000 || (authbits = study_ehlo_auths(sx)) != *ap)
1003 debug_printf("EHLO %s extensions changed, 0x%04x/0x%04x -> 0x%04x/0x%04x\n",
1004 tls_out.active.sock < 0 ? "cleartext" : "crypted",
1005 sx->peer_offered, *ap, peer_offered, authbits);
1006 *(tls_out.active.sock < 0
1007 ? &sx->ehlo_resp.cleartext_features : &sx->ehlo_resp.crypted_features) = peer_offered;
1009 if (peer_offered & OPTION_EARLY_PIPE)
1010 write_ehlo_cache_entry(sx);
1012 invalidate_ehlo_cache_entry(sx);
1014 return OK; /* just carry on */
1020 invalidate_ehlo_cache_entry(sx);
1021 (void) smtp_discard_responses(sx, sx->conn_args.ob, *countp);
1027 /*************************************************
1028 * Synchronize SMTP responses *
1029 *************************************************/
1031 /* This function is called from smtp_deliver() to receive SMTP responses from
1032 the server, and match them up with the commands to which they relate. When
1033 PIPELINING is not in use, this function is called after every command, and is
1034 therefore somewhat over-engineered, but it is simpler to use a single scheme
1035 that works both with and without PIPELINING instead of having two separate sets
1038 The set of commands that are buffered up with pipelining may start with MAIL
1039 and may end with DATA; in between are RCPT commands that correspond to the
1040 addresses whose status is PENDING_DEFER. All other commands (STARTTLS, AUTH,
1041 etc.) are never buffered.
1043 Errors after MAIL or DATA abort the whole process leaving the response in the
1044 buffer. After MAIL, pending responses are flushed, and the original command is
1045 re-instated in big_buffer for error messages. For RCPT commands, the remote is
1046 permitted to reject some recipient addresses while accepting others. However
1047 certain errors clearly abort the whole process. Set the value in
1048 transport_return to PENDING_OK if the address is accepted. If there is a
1049 subsequent general error, it will get reset accordingly. If not, it will get
1050 converted to OK at the end.
1053 sx smtp connection context
1054 count the number of responses to read
1055 pending_DATA 0 if last command sent was not DATA
1056 +1 if previously had a good recipient
1057 -1 if not previously had a good recipient
1059 Returns: 3 if at least one address had 2xx and one had 5xx
1060 2 if at least one address had 5xx but none had 2xx
1061 1 if at least one host had a 2xx response, but none had 5xx
1062 0 no address had 2xx or 5xx but no errors (all 4xx, or just DATA)
1063 -1 timeout while reading RCPT response
1064 -2 I/O or other non-response error for RCPT
1065 -3 DATA or MAIL failed - errno and buffer set
1066 -4 banner or EHLO failed (early-pipelining)
1067 -5 banner or EHLO failed (early-pipelining, TLS)
1071 sync_responses(smtp_context * sx, int count, int pending_DATA)
1073 address_item * addr = sx->sync_addr;
1074 smtp_transport_options_block * ob = sx->conn_args.ob;
1077 #ifdef EXPERIMENTAL_PIPE_CONNECT
1079 if ((rc = smtp_reap_early_pipe(sx, &count)) != OK)
1080 return rc == FAIL ? -4 : -5;
1083 /* Handle the response for a MAIL command. On error, reinstate the original
1084 command in big_buffer for error message use, and flush any further pending
1085 responses before returning, except after I/O errors and timeouts. */
1087 if (sx->pending_MAIL)
1089 DEBUG(D_transport) debug_printf("%s expect mail\n", __FUNCTION__);
1091 if (!smtp_read_response(sx, sx->buffer, sizeof(sx->buffer),
1092 '2', ob->command_timeout))
1094 DEBUG(D_transport) debug_printf("bad response for MAIL\n");
1095 Ustrcpy(big_buffer, mail_command); /* Fits, because it came from there! */
1096 if (errno == ERRNO_TLSFAILURE)
1098 if (errno == 0 && sx->buffer[0] != 0)
1101 if (sx->buffer[0] == '4')
1103 save_errno = ERRNO_MAIL4XX;
1104 addr->more_errno |= ((sx->buffer[1] - '0')*10 + sx->buffer[2] - '0') << 8;
1106 count = smtp_discard_responses(sx, ob, count);
1110 if (pending_DATA) count--; /* Number of RCPT responses to come */
1111 while (count-- > 0) /* Mark any pending addrs with the host used */
1113 while (addr->transport_return != PENDING_DEFER) addr = addr->next;
1114 addr->host_used = sx->conn_args.host;
1121 if (pending_DATA) count--; /* Number of RCPT responses to come */
1123 /* Read and handle the required number of RCPT responses, matching each one up
1124 with an address by scanning for the next address whose status is PENDING_DEFER.
1129 while (addr->transport_return != PENDING_DEFER)
1130 if (!(addr = addr->next))
1133 /* The address was accepted */
1134 addr->host_used = sx->conn_args.host;
1136 DEBUG(D_transport) debug_printf("%s expect rcpt\n", __FUNCTION__);
1137 if (smtp_read_response(sx, sx->buffer, sizeof(sx->buffer),
1138 '2', ob->command_timeout))
1141 addr->transport_return = PENDING_OK;
1143 /* If af_dr_retry_exists is set, there was a routing delay on this address;
1144 ensure that any address-specific retry record is expunged. We do this both
1145 for the basic key and for the version that also includes the sender. */
1147 if (testflag(addr, af_dr_retry_exists))
1149 uschar *altkey = string_sprintf("%s:<%s>", addr->address_retry_key,
1151 retry_add_item(addr, altkey, rf_delete);
1152 retry_add_item(addr, addr->address_retry_key, rf_delete);
1156 /* Error on first TLS read */
1158 else if (errno == ERRNO_TLSFAILURE)
1161 /* Timeout while reading the response */
1163 else if (errno == ETIMEDOUT)
1165 uschar *message = string_sprintf("SMTP timeout after RCPT TO:<%s>",
1166 transport_rcpt_address(addr, sx->conn_args.tblock->rcpt_include_affixes));
1167 set_errno_nohost(sx->first_addr, ETIMEDOUT, message, DEFER, FALSE);
1168 retry_add_item(addr, addr->address_retry_key, 0);
1169 update_waiting = FALSE;
1173 /* Handle other errors in obtaining an SMTP response by returning -1. This
1174 will cause all the addresses to be deferred. Restore the SMTP command in
1175 big_buffer for which we are checking the response, so the error message
1178 else if (errno != 0 || sx->buffer[0] == 0)
1180 string_format(big_buffer, big_buffer_size, "RCPT TO:<%s>",
1181 transport_rcpt_address(addr, sx->conn_args.tblock->rcpt_include_affixes));
1185 /* Handle SMTP permanent and temporary response codes. */
1190 string_sprintf("SMTP error from remote mail server after RCPT TO:<%s>: "
1191 "%s", transport_rcpt_address(addr, sx->conn_args.tblock->rcpt_include_affixes),
1192 string_printing(sx->buffer));
1193 setflag(addr, af_pass_message);
1195 msglog_line(sx->conn_args.host, addr->message);
1197 /* The response was 5xx */
1199 if (sx->buffer[0] == '5')
1201 addr->transport_return = FAIL;
1205 /* The response was 4xx */
1209 addr->transport_return = DEFER;
1210 addr->basic_errno = ERRNO_RCPT4XX;
1211 addr->more_errno |= ((sx->buffer[1] - '0')*10 + sx->buffer[2] - '0') << 8;
1215 #ifndef DISABLE_EVENT
1216 event_defer_errno = addr->more_errno;
1217 msg_event_raise(US"msg:rcpt:host:defer", addr);
1220 /* Log temporary errors if there are more hosts to be tried.
1221 If not, log this last one in the == line. */
1223 if (sx->conn_args.host->next)
1224 if (LOGGING(outgoing_port))
1225 log_write(0, LOG_MAIN, "H=%s [%s]:%d %s", sx->conn_args.host->name,
1226 sx->conn_args.host->address,
1227 sx->port == PORT_NONE ? 25 : sx->port, addr->message);
1229 log_write(0, LOG_MAIN, "H=%s [%s]: %s", sx->conn_args.host->name,
1230 sx->conn_args.host->address, addr->message);
1232 #ifndef DISABLE_EVENT
1234 msg_event_raise(US"msg:rcpt:defer", addr);
1237 /* Do not put this message on the list of those waiting for specific
1238 hosts, as otherwise it is likely to be tried too often. */
1240 update_waiting = FALSE;
1242 /* Add a retry item for the address so that it doesn't get tried again
1243 too soon. If address_retry_include_sender is true, add the sender address
1244 to the retry key. */
1246 retry_add_item(addr,
1247 ob->address_retry_include_sender
1248 ? string_sprintf("%s:<%s>", addr->address_retry_key, sender_address)
1249 : addr->address_retry_key,
1254 } /* Loop for next RCPT response */
1256 /* Update where to start at for the next block of responses, unless we
1257 have already handled all the addresses. */
1259 if (addr) sx->sync_addr = addr->next;
1261 /* Handle a response to DATA. If we have not had any good recipients, either
1262 previously or in this block, the response is ignored. */
1264 if (pending_DATA != 0)
1266 DEBUG(D_transport) debug_printf("%s expect data\n", __FUNCTION__);
1267 if (!smtp_read_response(sx, sx->buffer, sizeof(sx->buffer),
1268 '3', ob->command_timeout))
1274 if (errno == ERRNO_TLSFAILURE) /* Error on first TLS read */
1277 if (pending_DATA > 0 || (yield & 1) != 0)
1279 if (errno == 0 && sx->buffer[0] == '4')
1281 errno = ERRNO_DATA4XX;
1282 sx->first_addr->more_errno |= ((sx->buffer[1] - '0')*10 + sx->buffer[2] - '0') << 8;
1286 (void)check_response(sx->conn_args.host, &errno, 0, sx->buffer, &code, &msg, &pass_message);
1287 DEBUG(D_transport) debug_printf("%s\nerror for DATA ignored: pipelining "
1288 "is in use and there were no good recipients\n", msg);
1292 /* All responses read and handled; MAIL (if present) received 2xx and DATA (if
1293 present) received 3xx. If any RCPTs were handled and yielded anything other
1294 than 4xx, yield will be set non-zero. */
1303 /* Try an authenticator's client entry */
1306 try_authenticator(smtp_context * sx, auth_instance * au)
1308 smtp_transport_options_block * ob = sx->conn_args.ob; /* transport options */
1309 host_item * host = sx->conn_args.host; /* host to deliver to */
1312 sx->outblock.authenticating = TRUE;
1313 rc = (au->info->clientcode)(au, sx, ob->command_timeout,
1314 sx->buffer, sizeof(sx->buffer));
1315 sx->outblock.authenticating = FALSE;
1316 DEBUG(D_transport) debug_printf("%s authenticator yielded %d\n", au->name, rc);
1318 /* A temporary authentication failure must hold up delivery to
1319 this host. After a permanent authentication failure, we carry on
1320 to try other authentication methods. If all fail hard, try to
1321 deliver the message unauthenticated unless require_auth was set. */
1326 f.smtp_authenticated = TRUE; /* stops the outer loop */
1327 client_authenticator = au->name;
1328 if (au->set_client_id)
1329 client_authenticated_id = expand_string(au->set_client_id);
1332 /* Failure after writing a command */
1337 /* Failure after reading a response */
1340 if (errno != 0 || sx->buffer[0] != '5') return FAIL;
1341 log_write(0, LOG_MAIN, "%s authenticator failed H=%s [%s] %s",
1342 au->name, host->name, host->address, sx->buffer);
1345 /* Failure by some other means. In effect, the authenticator
1346 decided it wasn't prepared to handle this case. Typically this
1347 is the result of "fail" in an expansion string. Do we need to
1348 log anything here? Feb 2006: a message is now put in the buffer
1349 if logging is required. */
1352 if (*sx->buffer != 0)
1353 log_write(0, LOG_MAIN, "%s authenticator cancelled "
1354 "authentication H=%s [%s] %s", au->name, host->name,
1355 host->address, sx->buffer);
1358 /* Internal problem, message in buffer. */
1361 set_errno_nohost(sx->addrlist, ERRNO_AUTHPROB, string_copy(sx->buffer),
1371 /* Do the client side of smtp-level authentication.
1374 sx smtp connection context
1376 sx->buffer should have the EHLO response from server (gets overwritten)
1379 OK Success, or failed (but not required): global "smtp_authenticated" set
1380 DEFER Failed authentication (and was required)
1381 ERROR Internal problem
1383 FAIL_SEND Failed communications - transmit
1388 smtp_auth(smtp_context * sx)
1390 host_item * host = sx->conn_args.host; /* host to deliver to */
1391 smtp_transport_options_block * ob = sx->conn_args.ob; /* transport options */
1392 int require_auth = verify_check_given_host(CUSS &ob->hosts_require_auth, host);
1393 #ifdef EXPERIMENTAL_PIPE_CONNECT
1394 unsigned short authbits = tls_out.active.sock >= 0
1395 ? sx->ehlo_resp.crypted_auths : sx->ehlo_resp.cleartext_auths;
1397 uschar * fail_reason = US"server did not advertise AUTH support";
1399 f.smtp_authenticated = FALSE;
1400 client_authenticator = client_authenticated_id = client_authenticated_sender = NULL;
1403 regex_AUTH = regex_must_compile(AUTHS_REGEX, FALSE, TRUE);
1405 /* Is the server offering AUTH? */
1409 #ifdef EXPERIMENTAL_PIPE_CONNECT
1410 sx->early_pipe_active ? authbits
1413 regex_match_and_setup(regex_AUTH, sx->buffer, 0, -1)
1416 uschar * names = NULL;
1417 expand_nmax = -1; /* reset */
1419 #ifdef EXPERIMENTAL_PIPE_CONNECT
1420 if (!sx->early_pipe_active)
1422 names = string_copyn(expand_nstring[1], expand_nlength[1]);
1424 /* Must not do this check until after we have saved the result of the
1425 regex match above as the check could be another RE. */
1427 if ( require_auth == OK
1428 || verify_check_given_host(CUSS &ob->hosts_try_auth, host) == OK)
1430 DEBUG(D_transport) debug_printf("scanning authentication mechanisms\n");
1431 fail_reason = US"no common mechanisms were found";
1433 #ifdef EXPERIMENTAL_PIPE_CONNECT
1434 if (sx->early_pipe_active)
1436 /* Scan our authenticators (which support use by a client and were offered
1437 by the server (checked at cache-write time)), not suppressed by
1438 client_condition. If one is found, attempt to authenticate by calling its
1439 client function. We are limited to supporting up to 16 authenticator
1440 public-names by the number of bits in a short. */
1446 for (bitnum = 0, au = auths;
1447 !f.smtp_authenticated && au && bitnum < 16;
1448 bitnum++, au = au->next) if (authbits & BIT(bitnum))
1450 if ( au->client_condition
1451 && !expand_check_condition(au->client_condition, au->name,
1452 US"client authenticator"))
1454 DEBUG(D_transport) debug_printf("skipping %s authenticator: %s\n",
1455 au->name, "client_condition is false");
1459 /* Found data for a listed mechanism. Call its client entry. Set
1460 a flag in the outblock so that data is overwritten after sending so
1461 that reflections don't show it. */
1463 fail_reason = US"authentication attempt(s) failed";
1465 if ((rc = try_authenticator(sx, au)) != OK)
1472 /* Scan the configured authenticators looking for one which is configured
1473 for use as a client, which is not suppressed by client_condition, and
1474 whose name matches an authentication mechanism supported by the server.
1475 If one is found, attempt to authenticate by calling its client function.
1478 for (auth_instance * au = auths; !f.smtp_authenticated && au; au = au->next)
1483 || ( au->client_condition
1484 && !expand_check_condition(au->client_condition, au->name,
1485 US"client authenticator")))
1487 DEBUG(D_transport) debug_printf("skipping %s authenticator: %s\n",
1489 (au->client)? "client_condition is false" :
1490 "not configured as a client");
1494 /* Loop to scan supported server mechanisms */
1498 int len = Ustrlen(au->public_name);
1501 while (isspace(*p)) p++;
1503 if (strncmpic(au->public_name, p, len) != 0 ||
1504 (p[len] != 0 && !isspace(p[len])))
1506 while (*p != 0 && !isspace(*p)) p++;
1510 /* Found data for a listed mechanism. Call its client entry. Set
1511 a flag in the outblock so that data is overwritten after sending so
1512 that reflections don't show it. */
1514 fail_reason = US"authentication attempt(s) failed";
1516 if ((rc = try_authenticator(sx, au)) != OK)
1519 break; /* If not authenticated, try next authenticator */
1520 } /* Loop for scanning supported server mechanisms */
1521 } /* Loop for further authenticators */
1525 /* If we haven't authenticated, but are required to, give up. */
1527 if (require_auth == OK && !f.smtp_authenticated)
1529 set_errno_nohost(sx->addrlist, ERRNO_AUTHFAIL,
1530 string_sprintf("authentication required but %s", fail_reason), DEFER,
1539 /* Construct AUTH appendix string for MAIL TO */
1542 buffer to build string
1543 addrlist chain of potential addresses to deliver
1544 ob transport options
1546 Globals f.smtp_authenticated
1547 client_authenticated_sender
1548 Return True on error, otherwise buffer has (possibly empty) terminated string
1552 smtp_mail_auth_str(uschar *buffer, unsigned bufsize, address_item *addrlist,
1553 smtp_transport_options_block *ob)
1555 uschar *local_authenticated_sender = authenticated_sender;
1558 debug_printf("smtp_mail_auth_str: as<%s> os<%s> SA<%s>\n", authenticated_sender, ob->authenticated_sender, f.smtp_authenticated?"Y":"N");
1561 if (ob->authenticated_sender != NULL)
1563 uschar *new = expand_string(ob->authenticated_sender);
1566 if (!f.expand_string_forcedfail)
1568 uschar *message = string_sprintf("failed to expand "
1569 "authenticated_sender: %s", expand_string_message);
1570 set_errno_nohost(addrlist, ERRNO_EXPANDFAIL, message, DEFER, FALSE);
1574 else if (new[0] != 0) local_authenticated_sender = new;
1577 /* Add the authenticated sender address if present */
1579 if ((f.smtp_authenticated || ob->authenticated_sender_force) &&
1580 local_authenticated_sender != NULL)
1582 string_format(buffer, bufsize, " AUTH=%s",
1583 auth_xtextencode(local_authenticated_sender,
1584 Ustrlen(local_authenticated_sender)));
1585 client_authenticated_sender = string_copy(local_authenticated_sender);
1596 /* Lookup TLSA record for host/port.
1597 Return: OK success with dnssec; DANE mode
1598 DEFER Do not use this host now, may retry later
1599 FAIL_FORCED No TLSA record; DANE not usable
1600 FAIL Do not use this connection
1604 tlsa_lookup(const host_item * host, dns_answer * dnsa, BOOL dane_required)
1606 /* move this out to host.c given the similarity to dns_lookup() ? */
1608 const uschar * fullname = buffer;
1612 /* TLSA lookup string */
1613 (void)sprintf(CS buffer, "_%d._tcp.%.256s", host->port, host->name);
1615 rc = dns_lookup(dnsa, buffer, T_TLSA, &fullname);
1616 sec = dns_is_secure(dnsa);
1618 debug_printf("TLSA lookup ret %d %sDNSSEC\n", rc, sec ? "" : "not ");
1623 return DEFER; /* just defer this TLS'd conn */
1631 for (dns_record * rr = dns_next_rr(dnsa, &dnss, RESET_ANSWERS); rr;
1632 rr = dns_next_rr(dnsa, &dnss, RESET_NEXT))
1633 if (rr->type == T_TLSA && rr->size > 3)
1635 uint16_t payload_length = rr->size - 3;
1636 uschar s[MAX_TLSA_EXPANDED_SIZE], * sp = s, * p = US rr->data;
1638 sp += sprintf(CS sp, "%d ", *p++); /* usage */
1639 sp += sprintf(CS sp, "%d ", *p++); /* selector */
1640 sp += sprintf(CS sp, "%d ", *p++); /* matchtype */
1641 while (payload_length-- > 0 && sp-s < (MAX_TLSA_EXPANDED_SIZE - 4))
1642 sp += sprintf(CS sp, "%02x", *p++);
1644 debug_printf(" %s\n", s);
1649 log_write(0, LOG_MAIN,
1650 "DANE error: TLSA lookup for %s not DNSSEC", host->name);
1653 case DNS_NODATA: /* no TLSA RR for this lookup */
1654 case DNS_NOMATCH: /* no records at all for this lookup */
1655 return dane_required ? FAIL : FAIL_FORCED;
1659 return dane_required ? FAIL : DEFER;
1666 typedef struct smtp_compare_s
1668 uschar *current_sender_address;
1669 struct transport_instance *tblock;
1673 /* Create a unique string that identifies this message, it is based on
1674 sender_address, helo_data and tls_certificate if enabled.
1678 smtp_local_identity(uschar * sender, struct transport_instance * tblock)
1680 address_item * addr1;
1681 uschar * if1 = US"";
1682 uschar * helo1 = US"";
1684 uschar * tlsc1 = US"";
1686 uschar * save_sender_address = sender_address;
1687 uschar * local_identity = NULL;
1688 smtp_transport_options_block * ob = SOB tblock->options_block;
1690 sender_address = sender;
1692 addr1 = deliver_make_addr (sender, TRUE);
1693 deliver_set_expansions(addr1);
1696 if1 = expand_string(ob->interface);
1699 helo1 = expand_string(ob->helo_data);
1702 if (ob->tls_certificate)
1703 tlsc1 = expand_string(ob->tls_certificate);
1704 local_identity = string_sprintf ("%s^%s^%s", if1, helo1, tlsc1);
1706 local_identity = string_sprintf ("%s^%s", if1, helo1);
1709 deliver_set_expansions(NULL);
1710 sender_address = save_sender_address;
1712 return local_identity;
1717 /* This routine is a callback that is called from transport_check_waiting.
1718 This function will evaluate the incoming message versus the previous
1719 message. If the incoming message is using a different local identity then
1720 we will veto this new message. */
1723 smtp_are_same_identities(uschar * message_id, smtp_compare_t * s_compare)
1725 uschar * message_local_identity,
1726 * current_local_identity,
1727 * new_sender_address;
1729 current_local_identity =
1730 smtp_local_identity(s_compare->current_sender_address, s_compare->tblock);
1732 if (!(new_sender_address = deliver_get_sender_address(message_id)))
1735 message_local_identity =
1736 smtp_local_identity(new_sender_address, s_compare->tblock);
1738 return Ustrcmp(current_local_identity, message_local_identity) == 0;
1744 ehlo_response(uschar * buf, unsigned checks)
1746 size_t bsize = Ustrlen(buf);
1748 /* debug_printf("%s: check for 0x%04x\n", __FUNCTION__, checks); */
1751 if ( checks & OPTION_TLS
1752 && pcre_exec(regex_STARTTLS, NULL, CS buf, bsize, 0, PCRE_EOPT, NULL, 0) < 0)
1754 checks &= ~OPTION_TLS;
1756 if ( checks & OPTION_IGNQ
1757 && pcre_exec(regex_IGNOREQUOTA, NULL, CS buf, bsize, 0,
1758 PCRE_EOPT, NULL, 0) < 0)
1759 checks &= ~OPTION_IGNQ;
1761 if ( checks & OPTION_CHUNKING
1762 && pcre_exec(regex_CHUNKING, NULL, CS buf, bsize, 0, PCRE_EOPT, NULL, 0) < 0)
1763 checks &= ~OPTION_CHUNKING;
1765 #ifndef DISABLE_PRDR
1766 if ( checks & OPTION_PRDR
1767 && pcre_exec(regex_PRDR, NULL, CS buf, bsize, 0, PCRE_EOPT, NULL, 0) < 0)
1769 checks &= ~OPTION_PRDR;
1772 if ( checks & OPTION_UTF8
1773 && pcre_exec(regex_UTF8, NULL, CS buf, bsize, 0, PCRE_EOPT, NULL, 0) < 0)
1775 checks &= ~OPTION_UTF8;
1777 if ( checks & OPTION_DSN
1778 && pcre_exec(regex_DSN, NULL, CS buf, bsize, 0, PCRE_EOPT, NULL, 0) < 0)
1779 checks &= ~OPTION_DSN;
1781 if ( checks & OPTION_PIPE
1782 && pcre_exec(regex_PIPELINING, NULL, CS buf, bsize, 0,
1783 PCRE_EOPT, NULL, 0) < 0)
1784 checks &= ~OPTION_PIPE;
1786 if ( checks & OPTION_SIZE
1787 && pcre_exec(regex_SIZE, NULL, CS buf, bsize, 0, PCRE_EOPT, NULL, 0) < 0)
1788 checks &= ~OPTION_SIZE;
1790 #ifdef EXPERIMENTAL_PIPE_CONNECT
1791 if ( checks & OPTION_EARLY_PIPE
1792 && pcre_exec(regex_EARLY_PIPE, NULL, CS buf, bsize, 0,
1793 PCRE_EOPT, NULL, 0) < 0)
1795 checks &= ~OPTION_EARLY_PIPE;
1797 /* debug_printf("%s: found 0x%04x\n", __FUNCTION__, checks); */
1803 /* Callback for emitting a BDAT data chunk header.
1805 If given a nonzero size, first flush any buffered SMTP commands
1806 then emit the command.
1808 Reap previous SMTP command responses if requested, and always reap
1809 the response from a previous BDAT command.
1812 tctx transport context
1813 chunk_size value for SMTP BDAT command
1815 tc_chunk_last add LAST option to SMTP BDAT command
1816 tc_reap_prev reap response to previous SMTP commands
1820 DEFER TLS error on first read (EHLO-resp); errno set
1824 smtp_chunk_cmd_callback(transport_ctx * tctx, unsigned chunk_size,
1827 smtp_transport_options_block * ob = SOB tctx->tblock->options_block;
1828 smtp_context * sx = tctx->smtp_context;
1832 /* Write SMTP chunk header command. If not reaping responses, note that
1833 there may be more writes (like, the chunk data) done soon. */
1837 #ifdef EXPERIMENTAL_PIPE_CONNECT
1838 BOOL new_conn = !!(sx->outblock.conn_args);
1840 if((cmd_count = smtp_write_command(sx,
1841 flags & tc_reap_prev ? SCMD_FLUSH : SCMD_MORE,
1842 "BDAT %u%s\r\n", chunk_size, flags & tc_chunk_last ? " LAST" : "")
1843 ) < 0) return ERROR;
1844 if (flags & tc_chunk_last)
1845 data_command = string_copy(big_buffer); /* Save for later error message */
1846 #ifdef EXPERIMENTAL_PIPE_CONNECT
1847 /* That command write could have been the one that made the connection.
1848 Copy the fd from the client conn ctx (smtp transport specific) to the
1849 generic transport ctx. */
1852 tctx->u.fd = sx->outblock.cctx->sock;
1856 prev_cmd_count = cmd_count += sx->cmd_count;
1858 /* Reap responses for any previous, but not one we just emitted */
1862 if (sx->pending_BDAT)
1865 if (flags & tc_reap_prev && prev_cmd_count > 0)
1867 DEBUG(D_transport) debug_printf("look for %d responses"
1868 " for previous pipelined cmds\n", prev_cmd_count);
1870 switch(sync_responses(sx, prev_cmd_count, 0))
1872 case 1: /* 2xx (only) => OK */
1873 case 3: sx->good_RCPT = TRUE; /* 2xx & 5xx => OK & progress made */
1874 case 2: sx->completed_addr = TRUE; /* 5xx (only) => progress made */
1875 case 0: break; /* No 2xx or 5xx, but no probs */
1877 case -5: errno = ERRNO_TLSFAILURE;
1879 #ifdef EXPERIMENTAL_PIPE_CONNECT
1880 case -4: /* non-2xx for pipelined banner or EHLO */
1882 case -1: /* Timeout on RCPT */
1883 default: return ERROR; /* I/O error, or any MAIL/DATA error */
1886 if (!sx->pending_BDAT)
1887 pipelining_active = FALSE;
1890 /* Reap response for an outstanding BDAT */
1892 if (sx->pending_BDAT)
1894 DEBUG(D_transport) debug_printf("look for one response for BDAT\n");
1896 if (!smtp_read_response(sx, sx->buffer, sizeof(sx->buffer), '2',
1897 ob->command_timeout))
1899 if (errno == 0 && sx->buffer[0] == '4')
1901 errno = ERRNO_DATA4XX; /*XXX does this actually get used? */
1902 sx->addrlist->more_errno |=
1903 ((sx->buffer[1] - '0')*10 + sx->buffer[2] - '0') << 8;
1908 sx->pending_BDAT = FALSE;
1909 pipelining_active = FALSE;
1911 else if (chunk_size > 0)
1912 sx->pending_BDAT = TRUE;
1915 sx->cmd_count = cmd_count;
1923 /*************************************************
1924 * Make connection for given message *
1925 *************************************************/
1929 ctx connection context
1930 suppress_tls if TRUE, don't attempt a TLS connection - this is set for
1931 a second attempt after TLS initialization fails
1933 Returns: OK - the connection was made and the delivery attempted;
1934 fd is set in the conn context, tls_out set up.
1935 DEFER - the connection could not be made, or something failed
1936 while setting up the SMTP session, or there was a
1937 non-message-specific error, such as a timeout.
1938 ERROR - helo_data or add_headers or authenticated_sender is
1939 specified for this transport, and the string failed
1943 smtp_setup_conn(smtp_context * sx, BOOL suppress_tls)
1945 smtp_transport_options_block * ob = sx->conn_args.tblock->options_block;
1946 BOOL pass_message = FALSE;
1947 uschar * message = NULL;
1951 uschar * tls_errstr;
1954 sx->conn_args.ob = ob;
1956 sx->lmtp = strcmpic(ob->protocol, US"lmtp") == 0;
1957 sx->smtps = strcmpic(ob->protocol, US"smtps") == 0;
1959 sx->send_rset = TRUE;
1960 sx->send_quit = TRUE;
1961 sx->setting_up = TRUE;
1963 sx->esmtp_sent = FALSE;
1965 sx->utf8_needed = FALSE;
1967 sx->dsn_all_lasthop = TRUE;
1968 #if defined(SUPPORT_TLS) && defined(SUPPORT_DANE)
1969 sx->conn_args.dane = FALSE;
1971 verify_check_given_host(CUSS &ob->hosts_require_dane, sx->conn_args.host) == OK;
1973 #ifdef EXPERIMENTAL_PIPE_CONNECT
1974 sx->early_pipe_active = sx->early_pipe_ok = FALSE;
1975 sx->ehlo_resp.cleartext_features = sx->ehlo_resp.crypted_features = 0;
1976 sx->pending_BANNER = sx->pending_EHLO = FALSE;
1979 if ((sx->max_rcpt = sx->conn_args.tblock->max_addresses) == 0) sx->max_rcpt = 999999;
1980 sx->peer_offered = 0;
1981 sx->avoid_option = 0;
1982 sx->igquotstr = US"";
1983 if (!sx->helo_data) sx->helo_data = ob->helo_data;
1984 #ifdef EXPERIMENTAL_DSN_INFO
1985 sx->smtp_greeting = NULL;
1986 sx->helo_response = NULL;
1989 smtp_command = US"initial connection";
1990 sx->buffer[0] = '\0';
1992 /* Set up the buffer for reading SMTP response packets. */
1994 sx->inblock.buffer = sx->inbuffer;
1995 sx->inblock.buffersize = sizeof(sx->inbuffer);
1996 sx->inblock.ptr = sx->inbuffer;
1997 sx->inblock.ptrend = sx->inbuffer;
1999 /* Set up the buffer for holding SMTP commands while pipelining */
2001 sx->outblock.buffer = sx->outbuffer;
2002 sx->outblock.buffersize = sizeof(sx->outbuffer);
2003 sx->outblock.ptr = sx->outbuffer;
2004 sx->outblock.cmd_count = 0;
2005 sx->outblock.authenticating = FALSE;
2006 sx->outblock.conn_args = NULL;
2008 /* Reset the parameters of a TLS session. */
2011 tls_out.cipher = NULL; /* the one we may use for this transport */
2012 tls_out.ourcert = NULL;
2013 tls_out.peercert = NULL;
2014 tls_out.peerdn = NULL;
2015 #if defined(SUPPORT_TLS) && !defined(USE_GNUTLS)
2018 tls_out.ocsp = OCSP_NOT_REQ;
2020 /* Flip the legacy TLS-related variables over to the outbound set in case
2021 they're used in the context of the transport. Don't bother resetting
2022 afterward (when being used by a transport) as we're in a subprocess.
2023 For verify, unflipped once the callout is dealt with */
2025 tls_modify_variables(&tls_out);
2030 set_errno_nohost(sx->addrlist, ERRNO_TLSFAILURE, US"TLS support not available",
2036 /* Make a connection to the host if this isn't a continued delivery, and handle
2037 the initial interaction and HELO/EHLO/LHLO. Connect timeout errors are handled
2038 specially so they can be identified for retries. */
2040 if (!continue_hostname)
2043 HDEBUG(D_verify) debug_printf("interface=%s port=%d\n", sx->conn_args.interface, sx->port);
2045 /* Get the actual port the connection will use, into sx->conn_args.host */
2047 smtp_port_for_connect(sx->conn_args.host, sx->port);
2049 #if defined(SUPPORT_TLS) && defined(SUPPORT_DANE)
2050 /* Do TLSA lookup for DANE */
2052 tls_out.dane_verified = FALSE;
2053 tls_out.tlsa_usage = 0;
2055 if (sx->conn_args.host->dnssec == DS_YES)
2057 if( sx->dane_required
2058 || verify_check_given_host(CUSS &ob->hosts_try_dane, sx->conn_args.host) == OK
2060 switch (rc = tlsa_lookup(sx->conn_args.host, &sx->conn_args.tlsa_dnsa, sx->dane_required))
2062 case OK: sx->conn_args.dane = TRUE;
2063 ob->tls_tempfail_tryclear = FALSE;
2065 case FAIL_FORCED: break;
2066 default: set_errno_nohost(sx->addrlist, ERRNO_DNSDEFER,
2067 string_sprintf("DANE error: tlsa lookup %s",
2070 # ifndef DISABLE_EVENT
2071 (void) event_raise(sx->conn_args.tblock->event_action,
2072 US"dane:fail", sx->dane_required
2073 ? US"dane-required" : US"dnssec-invalid");
2078 else if (sx->dane_required)
2080 set_errno_nohost(sx->addrlist, ERRNO_DNSDEFER,
2081 string_sprintf("DANE error: %s lookup not DNSSEC", sx->conn_args.host->name),
2083 # ifndef DISABLE_EVENT
2084 (void) event_raise(sx->conn_args.tblock->event_action,
2085 US"dane:fail", US"dane-required");
2092 /* Make the TCP connection */
2094 sx->cctx.tls_ctx = NULL;
2095 sx->inblock.cctx = sx->outblock.cctx = &sx->cctx;
2096 sx->avoid_option = sx->peer_offered = smtp_peer_options = 0;
2098 #ifdef EXPERIMENTAL_PIPE_CONNECT
2099 if (verify_check_given_host(CUSS &ob->hosts_pipe_connect, sx->conn_args.host) == OK)
2101 sx->early_pipe_ok = TRUE;
2102 if ( read_ehlo_cache_entry(sx)
2103 && sx->ehlo_resp.cleartext_features & OPTION_EARLY_PIPE)
2105 DEBUG(D_transport) debug_printf("Using cached cleartext PIPE_CONNECT\n");
2106 sx->early_pipe_active = TRUE;
2107 sx->peer_offered = sx->ehlo_resp.cleartext_features;
2111 if (sx->early_pipe_active)
2112 sx->outblock.conn_args = &sx->conn_args;
2116 if ((sx->cctx.sock = smtp_connect(&sx->conn_args, NULL)) < 0)
2118 uschar * msg = NULL;
2121 msg = US strerror(errno);
2122 HDEBUG(D_verify) debug_printf("connect: %s\n", msg);
2124 set_errno_nohost(sx->addrlist,
2125 errno == ETIMEDOUT ? ERRNO_CONNECTTIMEOUT : errno,
2126 sx->verify ? string_sprintf("could not connect: %s", msg)
2129 sx->send_quit = FALSE;
2133 /* Expand the greeting message while waiting for the initial response. (Makes
2134 sense if helo_data contains ${lookup dnsdb ...} stuff). The expansion is
2135 delayed till here so that $sending_interface and $sending_port are set. */
2136 /*XXX early-pipe: they still will not be. Is there any way to find out what they
2137 will be? Somehow I doubt it. */
2140 if (!(sx->helo_data = expand_string(sx->helo_data)))
2142 log_write(0, LOG_MAIN|LOG_PANIC,
2143 "<%s>: failed to expand transport's helo_data value for callout: %s",
2144 sx->addrlist->address, expand_string_message);
2149 expand_string_message = NULL;
2150 if ((sx->helo_data = string_domain_utf8_to_alabel(sx->helo_data,
2151 &expand_string_message)),
2152 expand_string_message)
2154 log_write(0, LOG_MAIN|LOG_PANIC,
2155 "<%s>: failed to expand transport's helo_data value for callout: %s",
2156 sx->addrlist->address, expand_string_message);
2158 sx->helo_data = NULL;
2162 /* The first thing is to wait for an initial OK response. The dreaded "goto"
2163 is nevertheless a reasonably clean way of programming this kind of logic,
2164 where you want to escape on any error. */
2168 #ifdef EXPERIMENTAL_PIPE_CONNECT
2169 if (sx->early_pipe_active)
2171 sx->pending_BANNER = TRUE; /* sync_responses() must eventually handle */
2172 sx->outblock.cmd_count = 1;
2178 (void) setsockopt(sx->cctx.sock, IPPROTO_TCP, TCP_QUICKACK, US &off,
2181 if (!smtp_reap_banner(sx))
2182 goto RESPONSE_FAILED;
2185 #ifndef DISABLE_EVENT
2188 lookup_dnssec_authenticated = sx->conn_args.host->dnssec==DS_YES ? US"yes"
2189 : sx->conn_args.host->dnssec==DS_NO ? US"no" : NULL;
2190 s = event_raise(sx->conn_args.tblock->event_action, US"smtp:connect", sx->buffer);
2193 set_errno_nohost(sx->addrlist, ERRNO_EXPANDFAIL,
2194 string_sprintf("deferred by smtp:connect event expansion: %s", s),
2202 /* Now check if the helo_data expansion went well, and sign off cleanly if
2207 message = string_sprintf("failed to expand helo_data: %s",
2208 expand_string_message);
2209 set_errno_nohost(sx->addrlist, ERRNO_EXPANDFAIL, message, DEFER, FALSE);
2215 /** Debugging without sending a message
2216 sx->addrlist->transport_return = DEFER;
2220 /* Errors that occur after this point follow an SMTP command, which is
2221 left in big_buffer by smtp_write_command() for use in error messages. */
2223 smtp_command = big_buffer;
2225 /* Tell the remote who we are...
2227 February 1998: A convention has evolved that ESMTP-speaking MTAs include the
2228 string "ESMTP" in their greeting lines, so make Exim send EHLO if the
2229 greeting is of this form. The assumption was that the far end supports it
2230 properly... but experience shows that there are some that give 5xx responses,
2231 even though the banner includes "ESMTP" (there's a bloody-minded one that
2232 says "ESMTP not spoken here"). Cope with that case.
2234 September 2000: Time has passed, and it seems reasonable now to always send
2235 EHLO at the start. It is also convenient to make the change while installing
2238 July 2003: Joachim Wieland met a broken server that advertises "PIPELINING"
2239 but times out after sending MAIL FROM, RCPT TO and DATA all together. There
2240 would be no way to send out the mails, so there is now a host list
2241 "hosts_avoid_esmtp" that disables ESMTP for special hosts and solves the
2242 PIPELINING problem as well. Maybe it can also be useful to cure other
2243 problems with broken servers.
2245 Exim originally sent "Helo" at this point and ran for nearly a year that way.
2246 Then somebody tried it with a Microsoft mailer... It seems that all other
2247 mailers use upper case for some reason (the RFC is quite clear about case
2248 independence) so, for peace of mind, I gave in. */
2250 sx->esmtp = verify_check_given_host(CUSS &ob->hosts_avoid_esmtp, sx->conn_args.host) != OK;
2252 /* Alas; be careful, since this goto is not an error-out, so conceivably
2253 we might set data between here and the target which we assume to exist
2254 and be usable. I can see this coming back to bite us. */
2258 smtp_peer_options |= OPTION_TLS;
2259 suppress_tls = FALSE;
2260 ob->tls_tempfail_tryclear = FALSE;
2261 smtp_command = US"SSL-on-connect";
2268 if (smtp_write_command(sx,
2269 #ifdef EXPERIMENTAL_PIPE_CONNECT
2270 sx->early_pipe_active ? SCMD_BUFFER :
2273 "%s %s\r\n", sx->lmtp ? "LHLO" : "EHLO", sx->helo_data) < 0)
2275 sx->esmtp_sent = TRUE;
2277 #ifdef EXPERIMENTAL_PIPE_CONNECT
2278 if (sx->early_pipe_active)
2280 sx->pending_EHLO = TRUE;
2282 /* If we have too many authenticators to handle and might need to AUTH
2283 for this transport, pipeline no further as we will need the
2284 list of auth methods offered. Reap the banner and EHLO. */
2286 if ( (ob->hosts_require_auth || ob->hosts_try_auth)
2287 && f.smtp_in_early_pipe_no_auth)
2289 DEBUG(D_transport) debug_printf("may need to auth, so pipeline no further\n");
2290 if (smtp_write_command(sx, SCMD_FLUSH, NULL) < 0)
2292 if (sync_responses(sx, 2, 0) != 0)
2295 debug_printf("failed reaping pipelined cmd responses\n");
2296 goto RESPONSE_FAILED;
2298 sx->early_pipe_active = FALSE;
2303 if (!smtp_reap_ehlo(sx))
2304 goto RESPONSE_FAILED;
2308 debug_printf("not sending EHLO (host matches hosts_avoid_esmtp)\n");
2310 #ifdef EXPERIMENTAL_PIPE_CONNECT
2311 if (!sx->early_pipe_active)
2316 int n = sizeof(sx->buffer);
2317 uschar * rsp = sx->buffer;
2319 if (sx->esmtp_sent && (n = Ustrlen(sx->buffer)) < sizeof(sx->buffer)/2)
2320 { rsp = sx->buffer + n + 1; n = sizeof(sx->buffer) - n; }
2322 if (smtp_write_command(sx, SCMD_FLUSH, "HELO %s\r\n", sx->helo_data) < 0)
2324 good_response = smtp_read_response(sx, rsp, n, '2', ob->command_timeout);
2325 #ifdef EXPERIMENTAL_DSN_INFO
2326 sx->helo_response = string_copy(rsp);
2330 /* Handle special logging for a closed connection after HELO
2331 when had previously sent EHLO */
2333 if (rsp != sx->buffer && rsp[0] == 0 && (errno == 0 || errno == ECONNRESET))
2335 errno = ERRNO_SMTPCLOSED;
2336 goto EHLOHELO_FAILED;
2338 memmove(sx->buffer, rsp, Ustrlen(rsp));
2339 goto RESPONSE_FAILED;
2343 if (sx->esmtp || sx->lmtp)
2345 #ifdef EXPERIMENTAL_PIPE_CONNECT
2346 if (!sx->early_pipe_active)
2349 sx->peer_offered = ehlo_response(sx->buffer,
2350 OPTION_TLS /* others checked later */
2351 #ifdef EXPERIMENTAL_PIPE_CONNECT
2352 | (sx->early_pipe_ok
2354 | OPTION_CHUNKING | OPTION_PRDR | OPTION_DSN | OPTION_PIPE | OPTION_SIZE
2363 #ifdef EXPERIMENTAL_PIPE_CONNECT
2364 if (sx->early_pipe_ok)
2366 sx->ehlo_resp.cleartext_features = sx->peer_offered;
2368 if ( (sx->peer_offered & (OPTION_PIPE | OPTION_EARLY_PIPE))
2369 == (OPTION_PIPE | OPTION_EARLY_PIPE))
2371 DEBUG(D_transport) debug_printf("PIPE_CONNECT usable in future for this IP\n");
2372 sx->ehlo_resp.cleartext_auths = study_ehlo_auths(sx);
2373 write_ehlo_cache_entry(sx);
2379 /* Set tls_offered if the response to EHLO specifies support for STARTTLS. */
2382 smtp_peer_options |= sx->peer_offered & OPTION_TLS;
2387 /* For continuing deliveries down the same channel, having re-exec'd the socket
2388 is the standard input; for a socket held open from verify it is recorded
2389 in the cutthrough context block. Either way we don't need to redo EHLO here
2390 (but may need to do so for TLS - see below).
2391 Set up the pointer to where subsequent commands will be left, for
2392 error messages. Note that smtp_peer_options will have been
2393 set from the command line if they were set in the process that passed the
2396 /*XXX continue case needs to propagate DSN_INFO, prob. in deliver.c
2397 as the continue goes via transport_pass_socket() and doublefork and exec.
2398 It does not wait. Unclear how we keep separate host's responses
2399 separate - we could match up by host ip+port as a bodge. */
2403 if (cutthrough.cctx.sock >= 0 && cutthrough.callout_hold_only)
2405 sx->cctx = cutthrough.cctx;
2406 sx->conn_args.host->port = sx->port = cutthrough.host.port;
2410 sx->cctx.sock = 0; /* stdin */
2411 sx->cctx.tls_ctx = NULL;
2412 smtp_port_for_connect(sx->conn_args.host, sx->port); /* Record the port that was used */
2414 sx->inblock.cctx = sx->outblock.cctx = &sx->cctx;
2415 smtp_command = big_buffer;
2416 sx->helo_data = NULL; /* ensure we re-expand ob->helo_data */
2418 /* For a continued connection with TLS being proxied for us, or a
2419 held-open verify connection with TLS, nothing more to do. */
2421 if ( continue_proxy_cipher
2422 || (cutthrough.cctx.sock >= 0 && cutthrough.callout_hold_only
2423 && cutthrough.is_tls)
2426 sx->peer_offered = smtp_peer_options;
2427 sx->pipelining_used = pipelining_active = !!(smtp_peer_options & OPTION_PIPE);
2428 HDEBUG(D_transport) debug_printf("continued connection, %s TLS\n",
2429 continue_proxy_cipher ? "proxied" : "verify conn with");
2432 HDEBUG(D_transport) debug_printf("continued connection, no TLS\n");
2435 /* If TLS is available on this connection, whether continued or not, attempt to
2436 start up a TLS session, unless the host is in hosts_avoid_tls. If successful,
2437 send another EHLO - the server may give a different answer in secure mode. We
2438 use a separate buffer for reading the response to STARTTLS so that if it is
2439 negative, the original EHLO data is available for subsequent analysis, should
2440 the client not be required to use TLS. If the response is bad, copy the buffer
2441 for error analysis. */
2444 if ( smtp_peer_options & OPTION_TLS
2446 && verify_check_given_host(CUSS &ob->hosts_avoid_tls, sx->conn_args.host) != OK
2448 || verify_check_given_host(CUSS &ob->hosts_verify_avoid_tls, sx->conn_args.host) != OK
2451 uschar buffer2[4096];
2453 if (smtp_write_command(sx, SCMD_FLUSH, "STARTTLS\r\n") < 0)
2456 #ifdef EXPERIMENTAL_PIPE_CONNECT
2457 /* If doing early-pipelining reap the banner and EHLO-response but leave
2458 the response for the STARTTLS we just sent alone. */
2460 if (sx->early_pipe_active && sync_responses(sx, 2, 0) != 0)
2463 debug_printf("failed reaping pipelined cmd responses\n");
2464 goto RESPONSE_FAILED;
2468 /* If there is an I/O error, transmission of this message is deferred. If
2469 there is a temporary rejection of STARRTLS and tls_tempfail_tryclear is
2470 false, we also defer. However, if there is a temporary rejection of STARTTLS
2471 and tls_tempfail_tryclear is true, or if there is an outright rejection of
2472 STARTTLS, we carry on. This means we will try to send the message in clear,
2473 unless the host is in hosts_require_tls (tested below). */
2475 if (!smtp_read_response(sx, buffer2, sizeof(buffer2), '2', ob->command_timeout))
2479 || (buffer2[0] == '4' && !ob->tls_tempfail_tryclear)
2482 Ustrncpy(sx->buffer, buffer2, sizeof(sx->buffer));
2483 sx->buffer[sizeof(sx->buffer)-1] = '\0';
2484 goto RESPONSE_FAILED;
2488 /* STARTTLS accepted: try to negotiate a TLS session. */
2493 if (!tls_client_start(&sx->cctx, &sx->conn_args, sx->addrlist, &tls_out, &tls_errstr))
2495 /* TLS negotiation failed; give an error. From outside, this function may
2496 be called again to try in clear on a new connection, if the options permit
2497 it for this host. */
2501 DEBUG(D_tls) debug_printf("TLS session fail: %s\n", tls_errstr);
2503 # ifdef SUPPORT_DANE
2504 if (sx->conn_args.dane)
2506 log_write(0, LOG_MAIN,
2507 "DANE attempt failed; TLS connection to %s [%s]: %s",
2508 sx->conn_args.host->name, sx->conn_args.host->address, tls_errstr);
2509 # ifndef DISABLE_EVENT
2510 (void) event_raise(sx->conn_args.tblock->event_action,
2511 US"dane:fail", US"validation-failure"); /* could do with better detail */
2516 errno = ERRNO_TLSFAILURE;
2517 message = string_sprintf("TLS session: %s", tls_errstr);
2518 sx->send_quit = FALSE;
2522 /* TLS session is set up */
2524 smtp_peer_options_wrap = smtp_peer_options;
2525 for (address_item * addr = sx->addrlist; addr; addr = addr->next)
2526 if (addr->transport_return == PENDING_DEFER)
2528 addr->cipher = tls_out.cipher;
2529 addr->ourcert = tls_out.ourcert;
2530 addr->peercert = tls_out.peercert;
2531 addr->peerdn = tls_out.peerdn;
2532 addr->ocsp = tls_out.ocsp;
2537 /* if smtps, we'll have smtp_command set to something else; always safe to
2539 smtp_command = big_buffer;
2541 /* If we started TLS, redo the EHLO/LHLO exchange over the secure channel. If
2542 helo_data is null, we are dealing with a connection that was passed from
2543 another process, and so we won't have expanded helo_data above. We have to
2544 expand it here. $sending_ip_address and $sending_port are set up right at the
2545 start of the Exim process (in exim.c). */
2547 if (tls_out.active.sock >= 0)
2549 uschar * greeting_cmd;
2551 if (!sx->helo_data && !(sx->helo_data = expand_string(ob->helo_data)))
2553 uschar *message = string_sprintf("failed to expand helo_data: %s",
2554 expand_string_message);
2555 set_errno_nohost(sx->addrlist, ERRNO_EXPANDFAIL, message, DEFER, FALSE);
2560 #ifdef EXPERIMENTAL_PIPE_CONNECT
2561 /* For SMTPS there is no cleartext early-pipe; use the crypted permission bit.
2562 We're unlikely to get the group sent and delivered before the server sends its
2563 banner, but it's still worth sending as a group.
2564 For STARTTLS allow for cleartext early-pipe but no crypted early-pipe, but not
2567 if (sx->smtps ? sx->early_pipe_ok : sx->early_pipe_active)
2569 sx->peer_offered = sx->ehlo_resp.crypted_features;
2570 if ((sx->early_pipe_active =
2571 !!(sx->ehlo_resp.crypted_features & OPTION_EARLY_PIPE)))
2572 DEBUG(D_transport) debug_printf("Using cached crypted PIPE_CONNECT\n");
2576 /* For SMTPS we need to wait for the initial OK response. */
2578 #ifdef EXPERIMENTAL_PIPE_CONNECT
2579 if (sx->early_pipe_active)
2581 sx->pending_BANNER = TRUE;
2582 sx->outblock.cmd_count = 1;
2586 if (!smtp_reap_banner(sx))
2587 goto RESPONSE_FAILED;
2590 greeting_cmd = US"LHLO";
2592 greeting_cmd = US"EHLO";
2595 greeting_cmd = US"HELO";
2597 debug_printf("not sending EHLO (host matches hosts_avoid_esmtp)\n");
2600 if (smtp_write_command(sx,
2601 #ifdef EXPERIMENTAL_PIPE_CONNECT
2602 sx->early_pipe_active ? SCMD_BUFFER :
2605 "%s %s\r\n", greeting_cmd, sx->helo_data) < 0)
2608 #ifdef EXPERIMENTAL_PIPE_CONNECT
2609 if (sx->early_pipe_active)
2610 sx->pending_EHLO = TRUE;
2614 if (!smtp_reap_ehlo(sx))
2617 /* The GnuTLS layer in Exim only spots a server-rejection of a client
2618 cert late, under TLS1.3 - which means here; the first time we try to
2619 receive crypted data. Treat it as if it was a connect-time failure.
2620 See also the early-pipe equivalent... which will be hard; every call
2621 to sync_responses will need to check the result.
2622 It would be nicer to have GnuTLS check the cert during the handshake.
2623 Can it do that, with all the flexibility we need? */
2625 tls_errstr = US"error on first read";
2626 goto GNUTLS_CONN_FAILED;
2629 goto RESPONSE_FAILED;
2631 smtp_peer_options = 0;
2635 /* If the host is required to use a secure channel, ensure that we
2639 # ifdef SUPPORT_DANE
2640 || sx->conn_args.dane
2642 || verify_check_given_host(CUSS &ob->hosts_require_tls, sx->conn_args.host) == OK
2645 errno = ERRNO_TLSREQUIRED;
2646 message = string_sprintf("a TLS session is required, but %s",
2647 smtp_peer_options & OPTION_TLS
2648 ? "an attempt to start TLS failed" : "the server did not offer TLS support");
2649 # if defined(SUPPORT_DANE) && !defined(DISABLE_EVENT)
2650 if (sx->conn_args.dane)
2651 (void) event_raise(sx->conn_args.tblock->event_action, US"dane:fail",
2652 smtp_peer_options & OPTION_TLS
2653 ? US"validation-failure" /* could do with better detail */
2654 : US"starttls-not-supported");
2658 #endif /*SUPPORT_TLS*/
2660 /* If TLS is active, we have just started it up and re-done the EHLO command,
2661 so its response needs to be analyzed. If TLS is not active and this is a
2662 continued session down a previously-used socket, we haven't just done EHLO, so
2665 if (continue_hostname == NULL
2667 || tls_out.active.sock >= 0
2671 if (sx->esmtp || sx->lmtp)
2673 #ifdef EXPERIMENTAL_PIPE_CONNECT
2674 if (!sx->early_pipe_active)
2677 sx->peer_offered = ehlo_response(sx->buffer,
2679 #ifdef EXPERIMENTAL_PIPE_CONNECT
2680 | (sx->lmtp && ob->lmtp_ignore_quota ? OPTION_IGNQ : 0)
2681 | OPTION_DSN | OPTION_PIPE | OPTION_SIZE
2682 | OPTION_CHUNKING | OPTION_PRDR | OPTION_UTF8
2683 | (tls_out.active.sock >= 0 ? OPTION_EARLY_PIPE : 0) /* not for lmtp */
2687 | (sx->lmtp && ob->lmtp_ignore_quota ? OPTION_IGNQ : 0)
2690 # ifdef SUPPORT_I18N
2691 | (sx->addrlist->prop.utf8_msg ? OPTION_UTF8 : 0)
2692 /*XXX if we hand peercaps on to continued-conn processes,
2693 must not depend on this addr */
2697 | (ob->size_addition >= 0 ? OPTION_SIZE : 0)
2700 #ifdef EXPERIMENTAL_PIPE_CONNECT
2701 if (tls_out.active.sock >= 0)
2702 sx->ehlo_resp.crypted_features = sx->peer_offered;
2706 /* Set for IGNOREQUOTA if the response to LHLO specifies support and the
2707 lmtp_ignore_quota option was set. */
2709 sx->igquotstr = sx->peer_offered & OPTION_IGNQ ? US" IGNOREQUOTA" : US"";
2711 /* If the response to EHLO specified support for the SIZE parameter, note
2712 this, provided size_addition is non-negative. */
2714 smtp_peer_options |= sx->peer_offered & OPTION_SIZE;
2716 /* Note whether the server supports PIPELINING. If hosts_avoid_esmtp matched
2717 the current host, esmtp will be false, so PIPELINING can never be used. If
2718 the current host matches hosts_avoid_pipelining, don't do it. */
2720 if ( sx->peer_offered & OPTION_PIPE
2721 && verify_check_given_host(CUSS &ob->hosts_avoid_pipelining, sx->conn_args.host) != OK)
2722 smtp_peer_options |= OPTION_PIPE;
2724 DEBUG(D_transport) debug_printf("%susing PIPELINING\n",
2725 smtp_peer_options & OPTION_PIPE ? "" : "not ");
2727 if ( sx->peer_offered & OPTION_CHUNKING
2728 && verify_check_given_host(CUSS &ob->hosts_try_chunking, sx->conn_args.host) != OK)
2729 sx->peer_offered &= ~OPTION_CHUNKING;
2731 if (sx->peer_offered & OPTION_CHUNKING)
2732 DEBUG(D_transport) debug_printf("CHUNKING usable\n");
2734 #ifndef DISABLE_PRDR
2735 if ( sx->peer_offered & OPTION_PRDR
2736 && verify_check_given_host(CUSS &ob->hosts_try_prdr, sx->conn_args.host) != OK)
2737 sx->peer_offered &= ~OPTION_PRDR;
2739 if (sx->peer_offered & OPTION_PRDR)
2740 DEBUG(D_transport) debug_printf("PRDR usable\n");
2743 /* Note if the server supports DSN */
2744 smtp_peer_options |= sx->peer_offered & OPTION_DSN;
2745 DEBUG(D_transport) debug_printf("%susing DSN\n",
2746 sx->peer_offered & OPTION_DSN ? "" : "not ");
2748 #ifdef EXPERIMENTAL_PIPE_CONNECT
2749 if ( sx->early_pipe_ok
2750 && !sx->early_pipe_active
2751 && tls_out.active.sock >= 0
2752 && smtp_peer_options & OPTION_PIPE
2753 && ( sx->ehlo_resp.cleartext_features | sx->ehlo_resp.crypted_features)
2754 & OPTION_EARLY_PIPE)
2756 DEBUG(D_transport) debug_printf("PIPE_CONNECT usable in future for this IP\n");
2757 sx->ehlo_resp.crypted_auths = study_ehlo_auths(sx);
2758 write_ehlo_cache_entry(sx);
2762 /* Note if the response to EHLO specifies support for the AUTH extension.
2763 If it has, check that this host is one we want to authenticate to, and do
2764 the business. The host name and address must be available when the
2765 authenticator's client driver is running. */
2767 switch (yield = smtp_auth(sx))
2769 default: goto SEND_QUIT;
2771 case FAIL_SEND: goto SEND_FAILED;
2772 case FAIL: goto RESPONSE_FAILED;
2776 sx->pipelining_used = pipelining_active = !!(smtp_peer_options & OPTION_PIPE);
2778 /* The setting up of the SMTP call is now complete. Any subsequent errors are
2779 message-specific. */
2781 sx->setting_up = FALSE;
2784 if (sx->addrlist->prop.utf8_msg)
2788 /* If the transport sets a downconversion mode it overrides any set by ACL
2791 if ((s = ob->utf8_downconvert))
2793 if (!(s = expand_string(s)))
2795 message = string_sprintf("failed to expand utf8_downconvert: %s",
2796 expand_string_message);
2797 set_errno_nohost(sx->addrlist, ERRNO_EXPANDFAIL, message, DEFER, FALSE);
2803 case '1': sx->addrlist->prop.utf8_downcvt = TRUE;
2804 sx->addrlist->prop.utf8_downcvt_maybe = FALSE;
2806 case '0': sx->addrlist->prop.utf8_downcvt = FALSE;
2807 sx->addrlist->prop.utf8_downcvt_maybe = FALSE;
2809 case '-': if (s[1] == '1')
2811 sx->addrlist->prop.utf8_downcvt = FALSE;
2812 sx->addrlist->prop.utf8_downcvt_maybe = TRUE;
2818 sx->utf8_needed = !sx->addrlist->prop.utf8_downcvt
2819 && !sx->addrlist->prop.utf8_downcvt_maybe;
2820 DEBUG(D_transport) if (!sx->utf8_needed)
2821 debug_printf("utf8: %s downconvert\n",
2822 sx->addrlist->prop.utf8_downcvt ? "mandatory" : "optional");
2825 /* If this is an international message we need the host to speak SMTPUTF8 */
2826 if (sx->utf8_needed && !(sx->peer_offered & OPTION_UTF8))
2828 errno = ERRNO_UTF8_FWD;
2829 goto RESPONSE_FAILED;
2831 #endif /*SUPPORT_I18N*/
2841 sx->send_quit = check_response(sx->conn_args.host, &errno, sx->addrlist->more_errno,
2842 sx->buffer, &code, &message, &pass_message);
2848 message = US string_sprintf("send() to %s [%s] failed: %s",
2849 sx->conn_args.host->name, sx->conn_args.host->address, strerror(errno));
2850 sx->send_quit = FALSE;
2856 message = string_sprintf("Remote host closed connection in response to %s"
2857 " (EHLO response was: %s)", smtp_command, sx->buffer);
2858 sx->send_quit = FALSE;
2862 /* This label is jumped to directly when a TLS negotiation has failed,
2863 or was not done for a host for which it is required. Values will be set
2864 in message and errno, and setting_up will always be true. Treat as
2865 a temporary error. */
2869 code = '4', yield = DEFER;
2873 /* The failure happened while setting up the call; see if the failure was
2874 a 5xx response (this will either be on connection, or following HELO - a 5xx
2875 after EHLO causes it to try HELO). If so, and there are no more hosts to try,
2876 fail all addresses, as this host is never going to accept them. For other
2877 errors during setting up (timeouts or whatever), defer all addresses, and
2878 yield DEFER, so that the host is not tried again for a while.
2880 XXX This peeking for another host feels like a layering violation. We want
2881 to note the host as unusable, but down here we shouldn't know if this was
2882 the last host to try for the addr(list). Perhaps the upper layer should be
2883 the one to do set_errno() ? The problem is that currently the addr is where
2884 errno etc. are stashed, but until we run out of hosts to try the errors are
2885 host-specific. Maybe we should enhance the host_item definition? */
2888 sx->ok = FALSE; /* For when reached by GOTO */
2889 set_errno(sx->addrlist, errno, message,
2890 sx->conn_args.host->next
2894 || errno == ERRNO_UTF8_FWD
2897 pass_message, sx->conn_args.host
2898 #ifdef EXPERIMENTAL_DSN_INFO
2899 , sx->smtp_greeting, sx->helo_response
2908 (void)smtp_write_command(sx, SCMD_FLUSH, "QUIT\r\n");
2911 if (sx->cctx.tls_ctx)
2913 tls_close(sx->cctx.tls_ctx, TLS_SHUTDOWN_NOWAIT);
2914 sx->cctx.tls_ctx = NULL;
2918 /* Close the socket, and return the appropriate value, first setting
2919 works because the NULL setting is passed back to the calling process, and
2920 remote_max_parallel is forced to 1 when delivering over an existing connection,
2923 HDEBUG(D_transport|D_acl|D_v) debug_printf_indent(" SMTP(close)>>\n");
2926 shutdown(sx->cctx.sock, SHUT_WR);
2927 if (fcntl(sx->cctx.sock, F_SETFL, O_NONBLOCK) == 0)
2928 for (int i = 16; read(sx->cctx.sock, sx->inbuffer, sizeof(sx->inbuffer)) > 0 && i > 0;)
2929 i--; /* drain socket */
2930 sx->send_quit = FALSE;
2932 (void)close(sx->cctx.sock);
2935 #ifndef DISABLE_EVENT
2936 (void) event_raise(sx->conn_args.tblock->event_action, US"tcp:close", NULL);
2939 continue_transport = NULL;
2940 continue_hostname = NULL;
2947 /* Create the string of options that will be appended to the MAIL FROM:
2948 in the connection context buffer */
2951 build_mailcmd_options(smtp_context * sx, address_item * addrlist)
2953 uschar * p = sx->buffer;
2954 address_item * addr;
2959 /* If we know the receiving MTA supports the SIZE qualification, and we know it,
2960 send it, adding something to the message size to allow for imprecision
2961 and things that get added en route. Exim keeps the number of lines
2962 in a message, so we can give an accurate value for the original message, but we
2963 need some additional to handle added headers. (Double "." characters don't get
2964 included in the count.) */
2966 if ( message_size > 0
2967 && sx->peer_offered & OPTION_SIZE && !(sx->avoid_option & OPTION_SIZE))
2969 /*XXX problem here under spool_files_wireformat?
2970 Or just forget about lines? Or inflate by a fixed proportion? */
2972 sprintf(CS p, " SIZE=%d", message_size+message_linecount+(SOB sx->conn_args.ob)->size_addition);
2976 #ifndef DISABLE_PRDR
2977 /* If it supports Per-Recipient Data Responses, and we have more than one recipient,
2980 sx->prdr_active = FALSE;
2981 if (sx->peer_offered & OPTION_PRDR)
2982 for (address_item * addr = addrlist; addr; addr = addr->next)
2983 if (addr->transport_return == PENDING_DEFER)
2985 for (addr = addr->next; addr; addr = addr->next)
2986 if (addr->transport_return == PENDING_DEFER)
2987 { /* at least two recipients to send */
2988 sx->prdr_active = TRUE;
2989 sprintf(CS p, " PRDR"); p += 5;
2997 /* If it supports internationalised messages, and this meesage need that,
3000 if ( sx->peer_offered & OPTION_UTF8
3001 && addrlist->prop.utf8_msg
3002 && !addrlist->prop.utf8_downcvt
3004 Ustrcpy(p, " SMTPUTF8"), p += 9;
3007 /* check if all addresses have DSN-lasthop flag; do not send RET and ENVID if so */
3008 for (sx->dsn_all_lasthop = TRUE, addr = addrlist, address_count = 0;
3009 addr && address_count < sx->max_rcpt;
3010 addr = addr->next) if (addr->transport_return == PENDING_DEFER)
3013 if (!(addr->dsn_flags & rf_dsnlasthop))
3015 sx->dsn_all_lasthop = FALSE;
3020 /* Add any DSN flags to the mail command */
3022 if (sx->peer_offered & OPTION_DSN && !sx->dsn_all_lasthop)
3024 if (dsn_ret == dsn_ret_hdrs)
3025 { Ustrcpy(p, " RET=HDRS"); p += 9; }
3026 else if (dsn_ret == dsn_ret_full)
3027 { Ustrcpy(p, " RET=FULL"); p += 9; }
3031 string_format(p, sizeof(sx->buffer) - (p-sx->buffer), " ENVID=%s", dsn_envid);
3036 /* If an authenticated_sender override has been specified for this transport
3037 instance, expand it. If the expansion is forced to fail, and there was already
3038 an authenticated_sender for this message, the original value will be used.
3039 Other expansion failures are serious. An empty result is ignored, but there is
3040 otherwise no check - this feature is expected to be used with LMTP and other
3041 cases where non-standard addresses (e.g. without domains) might be required. */
3043 if (smtp_mail_auth_str(p, sizeof(sx->buffer) - (p-sx->buffer), addrlist, sx->conn_args.ob))
3051 build_rcptcmd_options(smtp_context * sx, const address_item * addr)
3053 uschar * p = sx->buffer;
3056 /* Add any DSN flags to the rcpt command */
3058 if (sx->peer_offered & OPTION_DSN && !(addr->dsn_flags & rf_dsnlasthop))
3060 if (addr->dsn_flags & rf_dsnflags)
3064 Ustrcpy(p, " NOTIFY=");
3066 for (int i = 0; i < nelem(rf_list); i++) if (addr->dsn_flags & rf_list[i])
3068 if (!first) *p++ = ',';
3070 Ustrcpy(p, rf_names[i]);
3075 if (addr->dsn_orcpt)
3077 string_format(p, sizeof(sx->buffer) - (p-sx->buffer), " ORCPT=%s",
3088 0 good, rcpt results in addr->transport_return (PENDING_OK, DEFER, FAIL)
3089 -1 MAIL response error
3090 -2 any non-MAIL read i/o error
3091 -3 non-MAIL response timeout
3092 -4 internal error; channel still usable
3097 smtp_write_mail_and_rcpt_cmds(smtp_context * sx, int * yield)
3099 address_item * addr;
3103 if (build_mailcmd_options(sx, sx->first_addr) != OK)
3109 /* From here until we send the DATA command, we can make use of PIPELINING
3110 if the server host supports it. The code has to be able to check the responses
3111 at any point, for when the buffer fills up, so we write it totally generally.
3112 When PIPELINING is off, each command written reports that it has flushed the
3115 sx->pending_MAIL = TRUE; /* The block starts with MAIL */
3118 uschar * s = sx->from_addr;
3120 uschar * errstr = NULL;
3122 /* If we must downconvert, do the from-address here. Remember we had to
3123 for the to-addresses (done below), and also (ugly) for re-doing when building
3124 the delivery log line. */
3126 if ( sx->addrlist->prop.utf8_msg
3127 && (sx->addrlist->prop.utf8_downcvt || !(sx->peer_offered & OPTION_UTF8))
3130 if (s = string_address_utf8_to_alabel(s, &errstr), errstr)
3132 set_errno_nohost(sx->addrlist, ERRNO_EXPANDFAIL, errstr, DEFER, FALSE);
3136 setflag(sx->addrlist, af_utf8_downcvt);
3140 rc = smtp_write_command(sx, pipelining_active ? SCMD_BUFFER : SCMD_FLUSH,
3141 "MAIL FROM:<%s>%s\r\n", s, sx->buffer);
3144 mail_command = string_copy(big_buffer); /* Save for later error message */
3148 case -1: /* Transmission error */
3151 case +1: /* Cmd was sent */
3152 if (!smtp_read_response(sx, sx->buffer, sizeof(sx->buffer), '2',
3153 (SOB sx->conn_args.ob)->command_timeout))
3155 if (errno == 0 && sx->buffer[0] == '4')
3157 errno = ERRNO_MAIL4XX;
3158 sx->addrlist->more_errno |= ((sx->buffer[1] - '0')*10 + sx->buffer[2] - '0') << 8;
3162 sx->pending_MAIL = FALSE;
3165 /* otherwise zero: command queued for pipeline */
3168 /* Pass over all the relevant recipient addresses for this host, which are the
3169 ones that have status PENDING_DEFER. If we are using PIPELINING, we can send
3170 several before we have to read the responses for those seen so far. This
3171 checking is done by a subroutine because it also needs to be done at the end.
3172 Send only up to max_rcpt addresses at a time, leaving next_addr pointing to
3173 the next one if not all are sent.
3175 In the MUA wrapper situation, we want to flush the PIPELINING buffer for the
3176 last address because we want to abort if any recipients have any kind of
3177 problem, temporary or permanent. We know that all recipient addresses will have
3178 the PENDING_DEFER status, because only one attempt is ever made, and we know
3179 that max_rcpt will be large, so all addresses will be done at once.
3181 For verify we flush the pipeline after any (the only) rcpt address. */
3183 for (addr = sx->first_addr, address_count = 0;
3184 addr && address_count < sx->max_rcpt;
3185 addr = addr->next) if (addr->transport_return == PENDING_DEFER)
3191 addr->dsn_aware = sx->peer_offered & OPTION_DSN
3192 ? dsn_support_yes : dsn_support_no;
3195 no_flush = pipelining_active && !sx->verify
3196 && (!mua_wrapper || addr->next && address_count < sx->max_rcpt);
3198 build_rcptcmd_options(sx, addr);
3200 /* Now send the RCPT command, and process outstanding responses when
3201 necessary. After a timeout on RCPT, we just end the function, leaving the
3202 yield as OK, because this error can often mean that there is a problem with
3203 just one address, so we don't want to delay the host. */
3205 rcpt_addr = transport_rcpt_address(addr, sx->conn_args.tblock->rcpt_include_affixes);
3208 if ( testflag(sx->addrlist, af_utf8_downcvt)
3209 && !(rcpt_addr = string_address_utf8_to_alabel(rcpt_addr, NULL))
3212 /*XXX could we use a per-address errstr here? Not fail the whole send? */
3213 errno = ERRNO_EXPANDFAIL;
3214 return -5; /*XXX too harsh? */
3218 count = smtp_write_command(sx, no_flush ? SCMD_BUFFER : SCMD_FLUSH,
3219 "RCPT TO:<%s>%s%s\r\n", rcpt_addr, sx->igquotstr, sx->buffer);
3221 if (count < 0) return -5;
3224 switch(sync_responses(sx, count, 0))
3226 case 3: sx->ok = TRUE; /* 2xx & 5xx => OK & progress made */
3227 case 2: sx->completed_addr = TRUE; /* 5xx (only) => progress made */
3230 case 1: sx->ok = TRUE; /* 2xx (only) => OK, but if LMTP, */
3231 if (!sx->lmtp) /* can't tell about progress yet */
3232 sx->completed_addr = TRUE;
3233 case 0: /* No 2xx or 5xx, but no probs */
3236 case -1: return -3; /* Timeout on RCPT */
3237 case -2: return -2; /* non-MAIL read i/o error */
3238 default: return -1; /* any MAIL error */
3240 #ifdef EXPERIMENTAL_PIPE_CONNECT
3241 case -4: return -1; /* non-2xx for pipelined banner or EHLO */
3242 case -5: return -1; /* TLS first-read error */
3245 sx->pending_MAIL = FALSE; /* Dealt with MAIL */
3247 } /* Loop for next address */
3249 sx->next_addr = addr;
3255 /*****************************************************
3256 * Proxy TLS connection for another transport process *
3257 ******************************************************/
3259 Close the unused end of the pipe, fork once more, then use the given buffer
3260 as a staging area, and select on both the given fd and the TLS'd client-fd for
3261 data to read (per the coding in ip_recv() and fd_ready() this is legitimate).
3262 Do blocking full-size writes, and reads under a timeout. Once both input
3263 channels are closed, exit the process.
3267 buf space to use for buffering
3268 bufsiz size of buffer
3269 pfd pipe filedescriptor array; [0] is comms to proxied process
3270 timeout per-read timeout, seconds
3274 smtp_proxy_tls(void * ct_ctx, uschar * buf, size_t bsize, int * pfd,
3278 int max_fd = MAX(pfd[0], tls_out.active.sock) + 1;
3284 DEBUG(D_transport) debug_printf("proxy-proc final-pid %d\n", rc);
3285 _exit(rc < 0 ? EXIT_FAILURE : EXIT_SUCCESS);
3288 if (f.running_in_test_harness) millisleep(100); /* let parent debug out */
3289 set_process_info("proxying TLS connection for continued transport");
3291 FD_SET(tls_out.active.sock, &rfds);
3292 FD_SET(pfd[0], &rfds);
3294 for (int fd_bits = 3; fd_bits; )
3296 time_t time_left = timeout;
3297 time_t time_start = time(NULL);
3303 struct timeval tv = { time_left, 0 };
3306 (SELECT_ARG2_TYPE *)&rfds, NULL, (SELECT_ARG2_TYPE *)&efds, &tv);
3308 if (rc < 0 && errno == EINTR)
3309 if ((time_left -= time(NULL) - time_start) > 0) continue;
3313 DEBUG(D_transport) if (rc == 0) debug_printf("%s: timed out\n", __FUNCTION__);
3317 if (FD_ISSET(tls_out.active.sock, &efds) || FD_ISSET(pfd[0], &efds))
3319 DEBUG(D_transport) debug_printf("select: exceptional cond on %s fd\n",
3320 FD_ISSET(pfd[0], &efds) ? "proxy" : "tls");
3324 while (rc < 0 || !(FD_ISSET(tls_out.active.sock, &rfds) || FD_ISSET(pfd[0], &rfds)));
3326 /* handle inbound data */
3327 if (FD_ISSET(tls_out.active.sock, &rfds))
3328 if ((rc = tls_read(ct_ctx, buf, bsize)) <= 0)
3331 FD_CLR(tls_out.active.sock, &rfds);
3332 shutdown(pfd[0], SHUT_WR);
3337 for (int nbytes = 0; rc - nbytes > 0; nbytes += i)
3338 if ((i = write(pfd[0], buf + nbytes, rc - nbytes)) < 0) goto done;
3340 else if (fd_bits & 1)
3341 FD_SET(tls_out.active.sock, &rfds);
3343 /* handle outbound data */
3344 if (FD_ISSET(pfd[0], &rfds))
3345 if ((rc = read(pfd[0], buf, bsize)) <= 0)
3348 tls_close(ct_ctx, TLS_SHUTDOWN_NOWAIT);
3353 for (int nbytes = 0; rc - nbytes > 0; nbytes += i)
3354 if ((i = tls_write(ct_ctx, buf + nbytes, rc - nbytes, FALSE)) < 0)
3357 else if (fd_bits & 2)
3358 FD_SET(pfd[0], &rfds);
3362 if (f.running_in_test_harness) millisleep(100); /* let logging complete */
3363 exim_exit(0, US"TLS proxy");
3368 /*************************************************
3369 * Deliver address list to given host *
3370 *************************************************/
3372 /* If continue_hostname is not null, we get here only when continuing to
3373 deliver down an existing channel. The channel was passed as the standard
3374 input. TLS is never active on a passed channel; the previous process always
3375 closes it down before passing the connection on.
3377 Otherwise, we have to make a connection to the remote host, and do the
3378 initial protocol exchange.
3380 When running as an MUA wrapper, if the sender or any recipient is rejected,
3381 temporarily or permanently, we force failure for all recipients.
3384 addrlist chain of potential addresses to deliver; only those whose
3385 transport_return field is set to PENDING_DEFER are currently
3386 being processed; others should be skipped - they have either
3387 been delivered to an earlier host or IP address, or been
3388 failed by one of them.
3389 host host to deliver to
3390 host_af AF_INET or AF_INET6
3391 defport default TCP/IP port to use if host does not specify, in host
3393 interface interface to bind to, or NULL
3394 tblock transport instance block
3395 message_defer set TRUE if yield is OK, but all addresses were deferred
3396 because of a non-recipient, non-host failure, that is, a
3397 4xx response to MAIL FROM, DATA, or ".". This is a defer
3398 that is specific to the message.
3399 suppress_tls if TRUE, don't attempt a TLS connection - this is set for
3400 a second attempt after TLS initialization fails
3402 Returns: OK - the connection was made and the delivery attempted;
3403 the result for each address is in its data block.
3404 DEFER - the connection could not be made, or something failed
3405 while setting up the SMTP session, or there was a
3406 non-message-specific error, such as a timeout.
3407 ERROR - a filter command is specified for this transport,
3408 and there was a problem setting it up; OR helo_data
3409 or add_headers or authenticated_sender is specified
3410 for this transport, and the string failed to expand
3414 smtp_deliver(address_item *addrlist, host_item *host, int host_af, int defport,
3415 uschar *interface, transport_instance *tblock,
3416 BOOL *message_defer, BOOL suppress_tls)
3418 smtp_transport_options_block * ob = SOB tblock->options_block;
3422 struct timeval start_delivery_time;
3424 BOOL pass_message = FALSE;
3425 uschar *message = NULL;
3426 uschar new_message_id[MESSAGE_ID_LENGTH + 1];
3430 gettimeofday(&start_delivery_time, NULL);
3431 suppress_tls = suppress_tls; /* stop compiler warning when no TLS support */
3432 *message_defer = FALSE;
3434 sx.addrlist = addrlist;
3435 sx.conn_args.host = host;
3436 sx.conn_args.host_af = host_af,
3438 sx.conn_args.interface = interface;
3439 sx.helo_data = NULL;
3440 sx.conn_args.tblock = tblock;
3442 sx.sync_addr = sx.first_addr = addrlist;
3444 /* Get the channel set up ready for a message (MAIL FROM being the next
3445 SMTP command to send */
3447 if ((rc = smtp_setup_conn(&sx, suppress_tls)) != OK)
3450 /* If there is a filter command specified for this transport, we can now
3451 set it up. This cannot be done until the identify of the host is known. */
3453 if (tblock->filter_command)
3455 transport_filter_timeout = tblock->filter_timeout;
3457 /* On failure, copy the error to all addresses, abandon the SMTP call, and
3460 if (!transport_set_up_command(&transport_filter_argv,
3461 tblock->filter_command, TRUE, DEFER, addrlist,
3462 string_sprintf("%.50s transport", tblock->name), NULL))
3464 set_errno_nohost(addrlist->next, addrlist->basic_errno, addrlist->message, DEFER,
3470 if ( transport_filter_argv
3471 && *transport_filter_argv
3472 && **transport_filter_argv
3473 && sx.peer_offered & OPTION_CHUNKING
3476 sx.peer_offered &= ~OPTION_CHUNKING;
3477 DEBUG(D_transport) debug_printf("CHUNKING not usable due to transport filter\n");
3481 /* For messages that have more than the maximum number of envelope recipients,
3482 we want to send several transactions down the same SMTP connection. (See
3483 comments in deliver.c as to how this reconciles, heuristically, with
3484 remote_max_parallel.) This optimization was added to Exim after the following
3485 code was already working. The simplest way to put it in without disturbing the
3486 code was to use a goto to jump back to this point when there is another
3487 transaction to handle. */
3490 sx.from_addr = return_path;
3491 sx.sync_addr = sx.first_addr;
3493 sx.send_rset = TRUE;
3494 sx.completed_addr = FALSE;
3497 /* If we are a continued-connection-after-verify the MAIL and RCPT
3498 commands were already sent; do not re-send but do mark the addrs as
3499 having been accepted up to RCPT stage. A traditional cont-conn
3500 always has a sequence number greater than one. */
3502 if (continue_hostname && continue_sequence == 1)
3504 sx.peer_offered = smtp_peer_options;
3505 sx.pending_MAIL = FALSE;
3507 sx.next_addr = NULL;
3509 for (address_item * addr = addrlist; addr; addr = addr->next)
3510 addr->transport_return = PENDING_OK;
3514 /* Initiate a message transfer. */
3516 switch(smtp_write_mail_and_rcpt_cmds(&sx, &yield))
3519 case -1: case -2: goto RESPONSE_FAILED;
3520 case -3: goto END_OFF;
3521 case -4: goto SEND_QUIT;
3522 default: goto SEND_FAILED;
3525 /* If we are an MUA wrapper, abort if any RCPTs were rejected, either
3526 permanently or temporarily. We should have flushed and synced after the last
3534 for (a = sx.first_addr, cnt = 0; a && cnt < sx.max_rcpt; a = a->next, cnt++)
3535 if (a->transport_return != PENDING_OK)
3537 /*XXX could we find a better errno than 0 here? */
3538 set_errno_nohost(addrlist, 0, a->message, FAIL,
3539 testflag(a, af_pass_message));
3546 /* If ok is TRUE, we know we have got at least one good recipient, and must now
3547 send DATA, but if it is FALSE (in the normal, non-wrapper case), we may still
3548 have a good recipient buffered up if we are pipelining. We don't want to waste
3549 time sending DATA needlessly, so we only send it if either ok is TRUE or if we
3550 are pipelining. The responses are all handled by sync_responses().
3551 If using CHUNKING, do not send a BDAT until we know how big a chunk we want
3554 if ( !(sx.peer_offered & OPTION_CHUNKING)
3555 && (sx.ok || (pipelining_active && !mua_wrapper)))
3557 int count = smtp_write_command(&sx, SCMD_FLUSH, "DATA\r\n");
3559 if (count < 0) goto SEND_FAILED;
3560 switch(sync_responses(&sx, count, sx.ok ? +1 : -1))
3562 case 3: sx.ok = TRUE; /* 2xx & 5xx => OK & progress made */
3563 case 2: sx.completed_addr = TRUE; /* 5xx (only) => progress made */
3566 case 1: sx.ok = TRUE; /* 2xx (only) => OK, but if LMTP, */
3567 if (!sx.lmtp) sx.completed_addr = TRUE; /* can't tell about progress yet */
3568 case 0: break; /* No 2xx or 5xx, but no probs */
3570 case -1: goto END_OFF; /* Timeout on RCPT */
3572 #ifdef EXPERIMENTAL_PIPE_CONNECT
3573 case -5: /* TLS first-read error */
3574 case -4: HDEBUG(D_transport)
3575 debug_printf("failed reaping pipelined cmd responses\n");
3577 default: goto RESPONSE_FAILED; /* I/O error, or any MAIL/DATA error */
3579 pipelining_active = FALSE;
3580 data_command = string_copy(big_buffer); /* Save for later error message */
3583 /* If there were no good recipients (but otherwise there have been no
3584 problems), just set ok TRUE, since we have handled address-specific errors
3585 already. Otherwise, it's OK to send the message. Use the check/escape mechanism
3586 for handling the SMTP dot-handling protocol, flagging to apply to headers as
3587 well as body. Set the appropriate timeout value to be used for each chunk.
3588 (Haven't been able to make it work using select() for writing yet.) */
3590 if (!(sx.peer_offered & OPTION_CHUNKING) && !sx.ok)
3592 /* Save the first address of the next batch. */
3593 sx.first_addr = sx.next_addr;
3599 transport_ctx tctx = {
3600 .u = {.fd = sx.cctx.sock}, /*XXX will this need TLS info? */
3603 .check_string = US".",
3604 .escape_string = US"..", /* Escaping strings */
3606 topt_use_crlf | topt_escape_headers
3607 | (tblock->body_only ? topt_no_headers : 0)
3608 | (tblock->headers_only ? topt_no_body : 0)
3609 | (tblock->return_path_add ? topt_add_return_path : 0)
3610 | (tblock->delivery_date_add ? topt_add_delivery_date : 0)
3611 | (tblock->envelope_to_add ? topt_add_envelope_to : 0)
3614 /* If using CHUNKING we need a callback from the generic transport
3615 support to us, for the sending of BDAT smtp commands and the reaping
3616 of responses. The callback needs a whole bunch of state so set up
3617 a transport-context structure to be passed around. */
3619 if (sx.peer_offered & OPTION_CHUNKING)
3621 tctx.check_string = tctx.escape_string = NULL;
3622 tctx.options |= topt_use_bdat;
3623 tctx.chunk_cb = smtp_chunk_cmd_callback;
3624 sx.pending_BDAT = FALSE;
3625 sx.good_RCPT = sx.ok;
3627 tctx.smtp_context = &sx;
3630 tctx.options |= topt_end_dot;
3632 /* Save the first address of the next batch. */
3633 sx.first_addr = sx.next_addr;
3635 /* Responses from CHUNKING commands go in buffer. Otherwise,
3636 there has not been a response. */
3640 sigalrm_seen = FALSE;
3641 transport_write_timeout = ob->data_timeout;
3642 smtp_command = US"sending data block"; /* For error messages */
3643 DEBUG(D_transport|D_v)
3644 if (sx.peer_offered & OPTION_CHUNKING)
3645 debug_printf(" will write message using CHUNKING\n");
3647 debug_printf(" SMTP>> writing message and terminating \".\"\n");
3648 transport_count = 0;
3650 #ifndef DISABLE_DKIM
3651 dkim_exim_sign_init();
3652 # ifdef EXPERIMENTAL_ARC
3654 uschar * s = ob->arc_sign;
3657 if (!(ob->dkim.arc_signspec = s = expand_string(s)))
3659 if (!f.expand_string_forcedfail)
3661 message = US"failed to expand arc_sign";
3668 /* Ask dkim code to hash the body for ARC */
3669 (void) arc_ams_setup_sign_bodyhash();
3670 ob->dkim.force_bodyhash = TRUE;
3675 sx.ok = dkim_transport_write_message(&tctx, &ob->dkim, CUSS &message);
3677 sx.ok = transport_write_message(&tctx, 0);
3680 /* transport_write_message() uses write() because it is called from other
3681 places to write to non-sockets. This means that under some OS (e.g. Solaris)
3682 it can exit with "Broken pipe" as its error. This really means that the
3683 socket got closed at the far end. */
3685 transport_write_timeout = 0; /* for subsequent transports */
3687 /* Failure can either be some kind of I/O disaster (including timeout),
3688 or the failure of a transport filter or the expansion of added headers.
3689 Or, when CHUNKING, it can be a protocol-detected failure. */
3692 if (message) goto SEND_FAILED;
3693 else goto RESPONSE_FAILED;
3695 /* We used to send the terminating "." explicitly here, but because of
3696 buffering effects at both ends of TCP/IP connections, you don't gain
3697 anything by keeping it separate, so it might as well go in the final
3698 data buffer for efficiency. This is now done by setting the topt_end_dot
3701 smtp_command = US"end of data";
3703 if (sx.peer_offered & OPTION_CHUNKING && sx.cmd_count > 1)
3705 /* Reap any outstanding MAIL & RCPT commands, but not a DATA-go-ahead */
3706 switch(sync_responses(&sx, sx.cmd_count-1, 0))
3708 case 3: sx.ok = TRUE; /* 2xx & 5xx => OK & progress made */
3709 case 2: sx.completed_addr = TRUE; /* 5xx (only) => progress made */
3712 case 1: sx.ok = TRUE; /* 2xx (only) => OK, but if LMTP, */
3713 if (!sx.lmtp) sx.completed_addr = TRUE; /* can't tell about progress yet */
3714 case 0: break; /* No 2xx or 5xx, but no probs */
3716 case -1: goto END_OFF; /* Timeout on RCPT */
3718 #ifdef EXPERIMENTAL_PIPE_CONNECT
3719 case -5: /* TLS first-read error */
3720 case -4: HDEBUG(D_transport)
3721 debug_printf("failed reaping pipelined cmd responses\n");
3723 default: goto RESPONSE_FAILED; /* I/O error, or any MAIL/DATA error */
3727 #ifndef DISABLE_PRDR
3728 /* For PRDR we optionally get a partial-responses warning followed by the
3729 individual responses, before going on with the overall response. If we don't
3730 get the warning then deal with per non-PRDR. */
3734 sx.ok = smtp_read_response(&sx, sx.buffer, sizeof(sx.buffer), '3', ob->final_timeout);
3735 if (!sx.ok && errno == 0) switch(sx.buffer[0])
3737 case '2': sx.prdr_active = FALSE;
3740 case '4': errno = ERRNO_DATA4XX;
3741 addrlist->more_errno |=
3742 ((sx.buffer[1] - '0')*10 + sx.buffer[2] - '0') << 8;
3749 /* For non-PRDR SMTP, we now read a single response that applies to the
3750 whole message. If it is OK, then all the addresses have been delivered. */
3754 sx.ok = smtp_read_response(&sx, sx.buffer, sizeof(sx.buffer), '2',
3756 if (!sx.ok && errno == 0 && sx.buffer[0] == '4')
3758 errno = ERRNO_DATA4XX;
3759 addrlist->more_errno |= ((sx.buffer[1] - '0')*10 + sx.buffer[2] - '0') << 8;
3763 /* For LMTP, we get back a response for every RCPT command that we sent;
3764 some may be accepted and some rejected. For those that get a response, their
3765 status is fixed; any that are accepted have been handed over, even if later
3766 responses crash - at least, that's how I read RFC 2033.
3768 If all went well, mark the recipient addresses as completed, record which
3769 host/IPaddress they were delivered to, and cut out RSET when sending another
3770 message down the same channel. Write the completed addresses to the journal
3771 now so that they are recorded in case there is a crash of hardware or
3772 software before the spool gets updated. Also record the final SMTP
3773 confirmation if needed (for SMTP only). */
3778 struct timeval delivery_time;
3780 uschar * conf = NULL;
3782 timesince(&delivery_time, &start_delivery_time);
3783 sx.send_rset = FALSE;
3784 pipelining_active = FALSE;
3786 /* Set up confirmation if needed - applies only to SMTP */
3789 #ifdef DISABLE_EVENT
3790 LOGGING(smtp_confirmation) &&
3795 const uschar *s = string_printing(sx.buffer);
3796 /* deconst cast ok here as string_printing was checked to have alloc'n'copied */
3797 conf = (s == sx.buffer)? US string_copy(s) : US s;
3800 /* Process all transported addresses - for LMTP or PRDR, read a status for
3803 for (address_item * addr = addrlist; addr != sx.first_addr; addr = addr->next)
3805 if (addr->transport_return != PENDING_OK) continue;
3807 /* LMTP - if the response fails badly (e.g. timeout), use it for all the
3808 remaining addresses. Otherwise, it's a return code for just the one
3809 address. For temporary errors, add a retry item for the address so that
3810 it doesn't get tried again too soon. */
3812 #ifndef DISABLE_PRDR
3813 if (sx.lmtp || sx.prdr_active)
3818 if (!smtp_read_response(&sx, sx.buffer, sizeof(sx.buffer), '2',
3821 if (errno != 0 || sx.buffer[0] == 0) goto RESPONSE_FAILED;
3822 addr->message = string_sprintf(
3823 #ifndef DISABLE_PRDR
3824 "%s error after %s: %s", sx.prdr_active ? "PRDR":"LMTP",
3826 "LMTP error after %s: %s",
3828 data_command, string_printing(sx.buffer));
3829 setflag(addr, af_pass_message); /* Allow message to go to user */
3830 if (sx.buffer[0] == '5')
3831 addr->transport_return = FAIL;
3834 errno = ERRNO_DATA4XX;
3835 addr->more_errno |= ((sx.buffer[1] - '0')*10 + sx.buffer[2] - '0') << 8;
3836 addr->transport_return = DEFER;
3837 #ifndef DISABLE_PRDR
3838 if (!sx.prdr_active)
3840 retry_add_item(addr, addr->address_retry_key, 0);
3844 sx.completed_addr = TRUE; /* NOW we can set this flag */
3845 if (LOGGING(smtp_confirmation))
3847 const uschar *s = string_printing(sx.buffer);
3848 /* deconst cast ok here as string_printing was checked to have alloc'n'copied */
3849 conf = (s == sx.buffer) ? US string_copy(s) : US s;
3853 /* SMTP, or success return from LMTP for this address. Pass back the
3854 actual host that was used. */
3856 addr->transport_return = OK;
3857 addr->more_errno = delivery_time.tv_sec;
3858 addr->delivery_usec = delivery_time.tv_usec;
3859 addr->host_used = host;
3860 addr->special_action = flag;
3861 addr->message = conf;
3863 if (tcp_out_fastopen)
3865 setflag(addr, af_tcp_fastopen_conn);
3866 if (tcp_out_fastopen >= TFO_USED_NODATA) setflag(addr, af_tcp_fastopen);
3867 if (tcp_out_fastopen >= TFO_USED_DATA) setflag(addr, af_tcp_fastopen_data);
3869 if (sx.pipelining_used) setflag(addr, af_pipelining);
3870 #ifdef EXPERIMENTAL_PIPE_CONNECT
3871 if (sx.early_pipe_active) setflag(addr, af_early_pipe);
3873 #ifndef DISABLE_PRDR
3874 if (sx.prdr_active) setflag(addr, af_prdr_used);
3876 if (sx.peer_offered & OPTION_CHUNKING) setflag(addr, af_chunking_used);
3879 #ifndef DISABLE_PRDR
3880 if (!sx.prdr_active)
3883 /* Update the journal. For homonymic addresses, use the base address plus
3884 the transport name. See lots of comments in deliver.c about the reasons
3885 for the complications when homonyms are involved. Just carry on after
3886 write error, as it may prove possible to update the spool file later. */
3888 if (testflag(addr, af_homonym))
3889 sprintf(CS sx.buffer, "%.500s/%s\n", addr->unique + 3, tblock->name);
3891 sprintf(CS sx.buffer, "%.500s\n", addr->unique);
3893 DEBUG(D_deliver) debug_printf("S:journalling %s\n", sx.buffer);
3894 len = Ustrlen(CS sx.buffer);
3895 if (write(journal_fd, sx.buffer, len) != len)
3896 log_write(0, LOG_MAIN|LOG_PANIC, "failed to write journal for "
3897 "%s: %s", sx.buffer, strerror(errno));
3901 #ifndef DISABLE_PRDR
3904 const uschar * overall_message;
3906 /* PRDR - get the final, overall response. For any non-success
3907 upgrade all the address statuses. */
3909 sx.ok = smtp_read_response(&sx, sx.buffer, sizeof(sx.buffer), '2',
3913 if(errno == 0 && sx.buffer[0] == '4')
3915 errno = ERRNO_DATA4XX;
3916 addrlist->more_errno |= ((sx.buffer[1] - '0')*10 + sx.buffer[2] - '0') << 8;
3918 for (address_item * addr = addrlist; addr != sx.first_addr; addr = addr->next)
3919 if (sx.buffer[0] == '5' || addr->transport_return == OK)
3920 addr->transport_return = PENDING_OK; /* allow set_errno action */
3921 goto RESPONSE_FAILED;
3924 /* Append the overall response to the individual PRDR response for logging
3925 and update the journal, or setup retry. */
3927 overall_message = string_printing(sx.buffer);
3928 for (address_item * addr = addrlist; addr != sx.first_addr; addr = addr->next)
3929 if (addr->transport_return == OK)
3930 addr->message = string_sprintf("%s\\n%s", addr->message, overall_message);
3932 for (address_item * addr = addrlist; addr != sx.first_addr; addr = addr->next)
3933 if (addr->transport_return == OK)
3935 if (testflag(addr, af_homonym))
3936 sprintf(CS sx.buffer, "%.500s/%s\n", addr->unique + 3, tblock->name);
3938 sprintf(CS sx.buffer, "%.500s\n", addr->unique);
3940 DEBUG(D_deliver) debug_printf("journalling(PRDR) %s\n", sx.buffer);
3941 len = Ustrlen(CS sx.buffer);
3942 if (write(journal_fd, sx.buffer, len) != len)
3943 log_write(0, LOG_MAIN|LOG_PANIC, "failed to write journal for "
3944 "%s: %s", sx.buffer, strerror(errno));
3946 else if (addr->transport_return == DEFER)
3947 retry_add_item(addr, addr->address_retry_key, -2);
3951 /* Ensure the journal file is pushed out to disk. */
3953 if (EXIMfsync(journal_fd) < 0)
3954 log_write(0, LOG_MAIN|LOG_PANIC, "failed to fsync journal: %s",
3960 /* Handle general (not specific to one address) failures here. The value of ok
3961 is used to skip over this code on the falling through case. A timeout causes a
3962 deferral. Other errors may defer or fail according to the response code, and
3963 may set up a special errno value, e.g. after connection chopped, which is
3964 assumed if errno == 0 and there is no text in the buffer. If control reaches
3965 here during the setting up phase (i.e. before MAIL FROM) then always defer, as
3966 the problem is not related to this specific message. */
3971 uschar * set_message;
3977 sx.send_quit = check_response(host, &save_errno, addrlist->more_errno,
3978 sx.buffer, &code, &message, &pass_message);
3986 message = string_sprintf("send() to %s [%s] failed: %s",
3987 host->name, host->address, message ? message : US strerror(save_errno));
3988 sx.send_quit = FALSE;
3996 sx.ok = FALSE; /* For when reached by GOTO */
3997 set_message = message;
3999 /* We want to handle timeouts after MAIL or "." and loss of connection after
4000 "." specially. They can indicate a problem with the sender address or with
4001 the contents of the message rather than a real error on the connection. These
4002 cases are treated in the same way as a 4xx response. This next bit of code
4003 does the classification. */
4010 message_error = TRUE;
4014 message_error = Ustrncmp(smtp_command,"MAIL",4) == 0 ||
4015 Ustrncmp(smtp_command,"end ",4) == 0;
4018 case ERRNO_SMTPCLOSED:
4019 message_error = Ustrncmp(smtp_command,"end ",4) == 0;
4023 message_error = FALSE;
4027 /* Handle the cases that are treated as message errors. These are:
4029 (a) negative response or timeout after MAIL
4030 (b) negative response after DATA
4031 (c) negative response or timeout or dropped connection after "."
4032 (d) utf8 support required and not offered
4034 It won't be a negative response or timeout after RCPT, as that is dealt
4035 with separately above. The action in all cases is to set an appropriate
4036 error code for all the addresses, but to leave yield set to OK because the
4037 host itself has not failed. Of course, it might in practice have failed
4038 when we've had a timeout, but if so, we'll discover that at the next
4039 delivery attempt. For a temporary error, set the message_defer flag, and
4040 write to the logs for information if this is not the last host. The error
4041 for the last host will be logged as part of the address's log line. */
4045 if (mua_wrapper) code = '5'; /* Force hard failure in wrapper mode */
4047 /* If there's an errno, the message contains just the identity of
4052 else /* Anything other than 5 is treated as temporary */
4056 message = US string_sprintf("%s: %s", message, strerror(save_errno));
4058 write_logs(host, message, sx.first_addr ? sx.first_addr->basic_errno : 0);
4060 *message_defer = TRUE;
4064 /* Otherwise, we have an I/O error or a timeout other than after MAIL or
4065 ".", or some other transportation error. We defer all addresses and yield
4066 DEFER, except for the case of failed add_headers expansion, or a transport
4067 filter failure, when the yield should be ERROR, to stop it trying other
4072 #ifdef EXPERIMENTAL_PIPE_CONNECT
4073 /* If we were early-pipelinng and the actual EHLO response did not match
4074 the cached value we assumed, we could have detected it and passed a
4075 custom errno through to here. It would be nice to RSET and retry right
4076 away, but to reliably do that we eould need an extra synch point before
4077 we committed to data and that would discard half the gained roundrips.
4078 Or we could summarily drop the TCP connection. but that is also ugly.
4079 Instead, we ignore the possibility (having freshened the cache) and rely
4080 on the server telling us with a nonmessage error if we have tried to
4081 do something it no longer supports. */
4084 yield = (save_errno == ERRNO_CHHEADER_FAIL ||
4085 save_errno == ERRNO_FILTER_FAIL) ? ERROR : DEFER;
4089 set_errno(addrlist, save_errno, set_message, set_rc, pass_message, host
4090 #ifdef EXPERIMENTAL_DSN_INFO
4091 , sx.smtp_greeting, sx.helo_response
4097 /* If all has gone well, send_quit will be set TRUE, implying we can end the
4098 SMTP session tidily. However, if there were too many addresses to send in one
4099 message (indicated by first_addr being non-NULL) we want to carry on with the
4100 rest of them. Also, it is desirable to send more than one message down the SMTP
4101 connection if there are several waiting, provided we haven't already sent so
4102 many as to hit the configured limit. The function transport_check_waiting looks
4103 for a waiting message and returns its id. Then transport_pass_socket tries to
4104 set up a continued delivery by passing the socket on to another process. The
4105 variable send_rset is FALSE if a message has just been successfully transferred.
4107 If we are already sending down a continued channel, there may be further
4108 addresses not yet delivered that are aimed at the same host, but which have not
4109 been passed in this run of the transport. In this case, continue_more will be
4110 true, and all we should do is send RSET if necessary, and return, leaving the
4113 However, if no address was disposed of, i.e. all addresses got 4xx errors, we
4114 do not want to continue with other messages down the same channel, because that
4115 can lead to looping between two or more messages, all with the same,
4116 temporarily failing address(es). [The retry information isn't updated yet, so
4117 new processes keep on trying.] We probably also don't want to try more of this
4118 message's addresses either.
4120 If we have started a TLS session, we have to end it before passing the
4121 connection to a new process. However, not all servers can handle this (Exim
4122 can), so we do not pass such a connection on if the host matches
4123 hosts_nopass_tls. */
4126 debug_printf("ok=%d send_quit=%d send_rset=%d continue_more=%d "
4127 "yield=%d first_address is %sNULL\n", sx.ok, sx.send_quit,
4128 sx.send_rset, f.continue_more, yield, sx.first_addr ? "not " : "");
4130 if (sx.completed_addr && sx.ok && sx.send_quit)
4133 smtp_compare_t t_compare;
4135 t_compare.tblock = tblock;
4136 t_compare.current_sender_address = sender_address;
4138 if ( sx.first_addr != NULL
4142 ( tls_out.active.sock < 0 && !continue_proxy_cipher
4143 || verify_check_given_host(CUSS &ob->hosts_nopass_tls, host) != OK
4147 transport_check_waiting(tblock->name, host->name,
4148 tblock->connection_max_messages, new_message_id, &more,
4149 (oicf)smtp_are_same_identities, (void*)&t_compare)
4156 if (! (sx.ok = smtp_write_command(&sx, SCMD_FLUSH, "RSET\r\n") >= 0))
4158 msg = US string_sprintf("send() to %s [%s] failed: %s", host->name,
4159 host->address, strerror(errno));
4160 sx.send_quit = FALSE;
4162 else if (! (sx.ok = smtp_read_response(&sx, sx.buffer, sizeof(sx.buffer),
4163 '2', ob->command_timeout)))
4166 sx.send_quit = check_response(host, &errno, 0, sx.buffer, &code, &msg,
4170 DEBUG(D_transport) debug_printf("H=%s [%s] %s\n",
4171 host->name, host->address, msg);
4175 /* Either RSET was not needed, or it succeeded */
4182 int socket_fd = sx.cctx.sock;
4185 if (sx.first_addr != NULL) /* More addresses still to be sent */
4186 { /* in this run of the transport */
4187 continue_sequence++; /* Causes * in logging */
4191 /* Unless caller said it already has more messages listed for this host,
4192 pass the connection on to a new Exim process (below, the call to
4193 transport_pass_socket). If the caller has more ready, just return with
4194 the connection still open. */
4197 if (tls_out.active.sock >= 0)
4198 if ( f.continue_more
4199 || verify_check_given_host(CUSS &ob->hosts_noproxy_tls, host) == OK)
4201 /* Before passing the socket on, or returning to caller with it still
4202 open, we must shut down TLS. Not all MTAs allow for the continuation
4203 of the SMTP session when TLS is shut down. We test for this by sending
4204 a new EHLO. If we don't get a good response, we don't attempt to pass
4207 tls_close(sx.cctx.tls_ctx, TLS_SHUTDOWN_WAIT);
4208 sx.cctx.tls_ctx = NULL;
4209 smtp_peer_options = smtp_peer_options_wrap;
4211 && smtp_write_command(&sx, SCMD_FLUSH, "EHLO %s\r\n", sx.helo_data)
4213 && smtp_read_response(&sx, sx.buffer, sizeof(sx.buffer),
4214 '2', ob->command_timeout);
4216 if (sx.ok && f.continue_more)
4217 return yield; /* More addresses for another run */
4221 /* Set up a pipe for proxying TLS for the new transport process */
4223 smtp_peer_options |= OPTION_TLS;
4224 if (sx.ok = (socketpair(AF_UNIX, SOCK_STREAM, 0, pfd) == 0))
4227 set_errno(sx.first_addr, errno, US"internal allocation problem",
4229 # ifdef EXPERIMENTAL_DSN_INFO
4230 , sx.smtp_greeting, sx.helo_response
4236 if (f.continue_more)
4237 return yield; /* More addresses for another run */
4239 /* If the socket is successfully passed, we mustn't send QUIT (or
4240 indeed anything!) from here. */
4242 /*XXX DSN_INFO: assume likely to do new HELO; but for greet we'll want to
4243 propagate it from the initial
4245 if (sx.ok && transport_pass_socket(tblock->name, host->name,
4246 host->address, new_message_id, socket_fd))
4248 sx.send_quit = FALSE;
4250 /* We have passed the client socket to a fresh transport process.
4251 If TLS is still active, we need to proxy it for the transport we
4252 just passed the baton to. Fork a child to to do it, and return to
4253 get logging done asap. Which way to place the work makes assumptions
4254 about post-fork prioritisation which may not hold on all platforms. */
4256 if (tls_out.active.sock >= 0)
4259 if (pid == 0) /* child; fork again to disconnect totally */
4261 if (f.running_in_test_harness) millisleep(100); /* let parent debug out */
4262 /* does not return */
4263 smtp_proxy_tls(sx.cctx.tls_ctx, sx.buffer, sizeof(sx.buffer), pfd,
4264 ob->command_timeout);
4267 if (pid > 0) /* parent */
4269 DEBUG(D_transport) debug_printf("proxy-proc inter-pid %d\n", pid);
4271 /* tidy the inter-proc to disconn the proxy proc */
4272 waitpid(pid, NULL, 0);
4273 tls_close(sx.cctx.tls_ctx, TLS_NO_SHUTDOWN);
4274 sx.cctx.tls_ctx = NULL;
4275 (void)close(sx.cctx.sock);
4277 continue_transport = NULL;
4278 continue_hostname = NULL;
4281 log_write(0, LOG_PANIC_DIE, "fork failed");
4287 /* If RSET failed and there are addresses left, they get deferred. */
4289 set_errno(sx.first_addr, errno, msg, DEFER, FALSE, host
4290 #ifdef EXPERIMENTAL_DSN_INFO
4291 , sx.smtp_greeting, sx.helo_response
4297 /* End off tidily with QUIT unless the connection has died or the socket has
4298 been passed to another process. There has been discussion on the net about what
4299 to do after sending QUIT. The wording of the RFC suggests that it is necessary
4300 to wait for a response, but on the other hand, there isn't anything one can do
4301 with an error response, other than log it. Exim used to do that. However,
4302 further discussion suggested that it is positively advantageous not to wait for
4303 the response, but to close the session immediately. This is supposed to move
4304 the TCP/IP TIME_WAIT state from the server to the client, thereby removing some
4305 load from the server. (Hosts that are both servers and clients may not see much
4306 difference, of course.) Further discussion indicated that this was safe to do
4307 on Unix systems which have decent implementations of TCP/IP that leave the
4308 connection around for a while (TIME_WAIT) after the application has gone away.
4309 This enables the response sent by the server to be properly ACKed rather than
4310 timed out, as can happen on broken TCP/IP implementations on other OS.
4312 This change is being made on 31-Jul-98. After over a year of trouble-free
4313 operation, the old commented-out code was removed on 17-Sep-99. */
4317 (void) setsockopt(sx.cctx.sock, IPPROTO_TCP, TCP_CORK, US &on, sizeof(on));
4319 if (sx.send_quit) (void)smtp_write_command(&sx, SCMD_FLUSH, "QUIT\r\n");
4324 tls_close(sx.cctx.tls_ctx, TLS_SHUTDOWN_NOWAIT);
4325 sx.cctx.tls_ctx = NULL;
4328 /* Close the socket, and return the appropriate value, first setting
4329 works because the NULL setting is passed back to the calling process, and
4330 remote_max_parallel is forced to 1 when delivering over an existing connection,
4332 If all went well and continue_more is set, we shouldn't actually get here if
4333 there are further addresses, as the return above will be taken. However,
4334 writing RSET might have failed, or there may be other addresses whose hosts are
4335 specified in the transports, and therefore not visible at top level, in which
4336 case continue_more won't get set. */
4338 HDEBUG(D_transport|D_acl|D_v) debug_printf_indent(" SMTP(close)>>\n");
4341 shutdown(sx.cctx.sock, SHUT_WR);
4342 millisleep(f.running_in_test_harness ? 200 : 20);
4343 if (fcntl(sx.cctx.sock, F_SETFL, O_NONBLOCK) == 0)
4344 for (int i = 16; read(sx.cctx.sock, sx.inbuffer, sizeof(sx.inbuffer)) > 0 && i > 0;)
4345 i--; /* drain socket */
4347 (void)close(sx.cctx.sock);
4349 #ifndef DISABLE_EVENT
4350 (void) event_raise(tblock->event_action, US"tcp:close", NULL);
4353 continue_transport = NULL;
4354 continue_hostname = NULL;
4361 /*************************************************
4362 * Closedown entry point *
4363 *************************************************/
4365 /* This function is called when exim is passed an open smtp channel
4366 from another incarnation, but the message which it has been asked
4367 to deliver no longer exists. The channel is on stdin.
4369 We might do fancy things like looking for another message to send down
4370 the channel, but if the one we sought has gone, it has probably been
4371 delivered by some other process that itself will seek further messages,
4372 so just close down our connection.
4374 Argument: pointer to the transport instance block
4379 smtp_transport_closedown(transport_instance *tblock)
4381 smtp_transport_options_block * ob = SOB tblock->options_block;
4382 client_conn_ctx cctx;
4385 uschar inbuffer[4096];
4386 uschar outbuffer[16];
4388 /*XXX really we need an active-smtp-client ctx, rather than assuming stdout */
4389 cctx.sock = fileno(stdin);
4390 cctx.tls_ctx = cctx.sock == tls_out.active.sock ? tls_out.active.tls_ctx : NULL;
4392 sx.inblock.cctx = &cctx;
4393 sx.inblock.buffer = inbuffer;
4394 sx.inblock.buffersize = sizeof(inbuffer);
4395 sx.inblock.ptr = inbuffer;
4396 sx.inblock.ptrend = inbuffer;
4398 sx.outblock.cctx = &cctx;
4399 sx.outblock.buffersize = sizeof(outbuffer);
4400 sx.outblock.buffer = outbuffer;
4401 sx.outblock.ptr = outbuffer;
4402 sx.outblock.cmd_count = 0;
4403 sx.outblock.authenticating = FALSE;
4405 (void)smtp_write_command(&sx, SCMD_FLUSH, "QUIT\r\n");
4406 (void)smtp_read_response(&sx, buffer, sizeof(buffer), '2', ob->command_timeout);
4407 (void)close(cctx.sock);
4412 /*************************************************
4413 * Prepare addresses for delivery *
4414 *************************************************/
4416 /* This function is called to flush out error settings from previous delivery
4417 attempts to other hosts. It also records whether we got here via an MX record
4418 or not in the more_errno field of the address. We are interested only in
4419 addresses that are still marked DEFER - others may have got delivered to a
4420 previously considered IP address. Set their status to PENDING_DEFER to indicate
4421 which ones are relevant this time.
4424 addrlist the list of addresses
4425 host the host we are delivering to
4427 Returns: the first address for this delivery
4430 static address_item *
4431 prepare_addresses(address_item *addrlist, host_item *host)
4433 address_item *first_addr = NULL;
4434 for (address_item * addr = addrlist; addr; addr = addr->next)
4435 if (addr->transport_return == DEFER)
4437 if (!first_addr) first_addr = addr;
4438 addr->transport_return = PENDING_DEFER;
4439 addr->basic_errno = 0;
4440 addr->more_errno = (host->mx >= 0)? 'M' : 'A';
4441 addr->message = NULL;
4443 addr->cipher = NULL;
4444 addr->ourcert = NULL;
4445 addr->peercert = NULL;
4446 addr->peerdn = NULL;
4447 addr->ocsp = OCSP_NOT_REQ;
4449 #ifdef EXPERIMENTAL_DSN_INFO
4450 addr->smtp_greeting = NULL;
4451 addr->helo_response = NULL;
4459 /*************************************************
4460 * Main entry point *
4461 *************************************************/
4463 /* See local README for interface details. As this is a remote transport, it is
4464 given a chain of addresses to be delivered in one connection, if possible. It
4465 always returns TRUE, indicating that each address has its own independent
4466 status set, except if there is a setting up problem, in which case it returns
4470 smtp_transport_entry(
4471 transport_instance *tblock, /* data for this instantiation */
4472 address_item *addrlist) /* addresses we are working on */
4475 int hosts_defer = 0;
4477 int hosts_looked_up = 0;
4478 int hosts_retry = 0;
4479 int hosts_serial = 0;
4480 int hosts_total = 0;
4481 int total_hosts_tried = 0;
4482 BOOL expired = TRUE;
4483 uschar *expanded_hosts = NULL;
4485 uschar *tid = string_sprintf("%s transport", tblock->name);
4486 smtp_transport_options_block *ob = SOB tblock->options_block;
4487 host_item *hostlist = addrlist->host_list;
4488 host_item *host = NULL;
4492 debug_printf("%s transport entered\n", tblock->name);
4493 for (address_item * addr = addrlist; addr; addr = addr->next)
4494 debug_printf(" %s\n", addr->address);
4497 debug_printf("hostlist:\n");
4498 for (host_item * host = hostlist; host; host = host->next)
4499 debug_printf(" '%s' IP %s port %d\n", host->name, host->address, host->port);
4501 if (continue_hostname)
4502 debug_printf("already connected to %s [%s] (on fd %d)\n",
4503 continue_hostname, continue_host_address,
4504 cutthrough.cctx.sock >= 0 ? cutthrough.cctx.sock : 0);
4507 /* Set the flag requesting that these hosts be added to the waiting
4508 database if the delivery fails temporarily or if we are running with
4509 queue_smtp or a 2-stage queue run. This gets unset for certain
4510 kinds of error, typically those that are specific to the message. */
4512 update_waiting = TRUE;
4514 /* If a host list is not defined for the addresses - they must all have the
4515 same one in order to be passed to a single transport - or if the transport has
4516 a host list with hosts_override set, use the host list supplied with the
4517 transport. It is an error for this not to exist. */
4519 if (!hostlist || (ob->hosts_override && ob->hosts))
4523 addrlist->message = string_sprintf("%s transport called with no hosts set",
4525 addrlist->transport_return = PANIC;
4526 return FALSE; /* Only top address has status */
4529 DEBUG(D_transport) debug_printf("using the transport's hosts: %s\n",
4532 /* If the transport's host list contains no '$' characters, and we are not
4533 randomizing, it is fixed and therefore a chain of hosts can be built once
4534 and for all, and remembered for subsequent use by other calls to this
4535 transport. If, on the other hand, the host list does contain '$', or we are
4536 randomizing its order, we have to rebuild it each time. In the fixed case,
4537 as the hosts string will never be used again, it doesn't matter that we
4538 replace all the : characters with zeros. */
4542 uschar *s = ob->hosts;
4544 if (Ustrchr(s, '$') != NULL)
4546 if (!(expanded_hosts = expand_string(s)))
4548 addrlist->message = string_sprintf("failed to expand list of hosts "
4549 "\"%s\" in %s transport: %s", s, tblock->name, expand_string_message);
4550 addrlist->transport_return = f.search_find_defer ? DEFER : PANIC;
4551 return FALSE; /* Only top address has status */
4553 DEBUG(D_transport) debug_printf("expanded list of hosts \"%s\" to "
4554 "\"%s\"\n", s, expanded_hosts);
4558 if (ob->hosts_randomize) s = expanded_hosts = string_copy(s);
4560 host_build_hostlist(&hostlist, s, ob->hosts_randomize);
4562 /* Check that the expansion yielded something useful. */
4566 string_sprintf("%s transport has empty hosts setting", tblock->name);
4567 addrlist->transport_return = PANIC;
4568 return FALSE; /* Only top address has status */
4571 /* If there was no expansion of hosts, save the host list for
4574 if (!expanded_hosts) ob->hostlist = hostlist;
4577 /* This is not the first time this transport has been run in this delivery;
4578 the host list was built previously. */
4581 hostlist = ob->hostlist;
4584 /* The host list was supplied with the address. If hosts_randomize is set, we
4585 must sort it into a random order if it did not come from MX records and has not
4586 already been randomized (but don't bother if continuing down an existing
4589 else if (ob->hosts_randomize && hostlist->mx == MX_NONE && !continue_hostname)
4591 host_item *newlist = NULL;
4594 host_item *h = hostlist;
4595 hostlist = hostlist->next;
4597 h->sort_key = random_number(100);
4604 else if (h->sort_key < newlist->sort_key)
4611 host_item *hh = newlist;
4614 if (h->sort_key < hh->next->sort_key) break;
4622 hostlist = addrlist->host_list = newlist;
4625 /* Sort out the default port. */
4627 if (!smtp_get_port(ob->port, addrlist, &defport, tid)) return FALSE;
4629 /* For each host-plus-IP-address on the list:
4631 . If this is a continued delivery and the host isn't the one with the
4632 current connection, skip.
4634 . If the status is unusable (i.e. previously failed or retry checked), skip.
4636 . If no IP address set, get the address, either by turning the name into
4637 an address, calling gethostbyname if gethostbyname is on, or by calling
4638 the DNS. The DNS may yield multiple addresses, in which case insert the
4639 extra ones into the list.
4641 . Get the retry data if not previously obtained for this address and set the
4642 field which remembers the state of this address. Skip if the retry time is
4643 not reached. If not, remember whether retry data was found. The retry string
4644 contains both the name and the IP address.
4646 . Scan the list of addresses and mark those whose status is DEFER as
4647 PENDING_DEFER. These are the only ones that will be processed in this cycle
4650 . Make a delivery attempt - addresses marked PENDING_DEFER will be tried.
4651 Some addresses may be successfully delivered, others may fail, and yet
4652 others may get temporary errors and so get marked DEFER.
4654 . The return from the delivery attempt is OK if a connection was made and a
4655 valid SMTP dialogue was completed. Otherwise it is DEFER.
4657 . If OK, add a "remove" retry item for this host/IPaddress, if any.
4659 . If fail to connect, or other defer state, add a retry item.
4661 . If there are any addresses whose status is still DEFER, carry on to the
4662 next host/IPaddress, unless we have tried the number of hosts given
4663 by hosts_max_try or hosts_max_try_hardlimit; otherwise return. Note that
4664 there is some fancy logic for hosts_max_try that means its limit can be
4665 overstepped in some circumstances.
4667 If we get to the end of the list, all hosts have deferred at least one address,
4668 or not reached their retry times. If delay_after_cutoff is unset, it requests a
4669 delivery attempt to those hosts whose last try was before the arrival time of
4670 the current message. To cope with this, we have to go round the loop a second
4671 time. After that, set the status and error data for any addresses that haven't
4672 had it set already. */
4674 for (int cutoff_retry = 0;
4675 expired && cutoff_retry < (ob->delay_after_cutoff ? 1 : 2);
4678 host_item *nexthost = NULL;
4679 int unexpired_hosts_tried = 0;
4680 BOOL continue_host_tried = FALSE;
4682 retry_non_continued:
4683 for (host = hostlist;
4685 && unexpired_hosts_tried < ob->hosts_max_try
4686 && total_hosts_tried < ob->hosts_max_try_hardlimit;
4691 BOOL host_is_expired = FALSE;
4692 BOOL message_defer = FALSE;
4693 BOOL some_deferred = FALSE;
4694 address_item *first_addr = NULL;
4695 uschar *interface = NULL;
4696 uschar *retry_host_key = NULL;
4697 uschar *retry_message_key = NULL;
4698 uschar *serialize_key = NULL;
4700 /* Default next host is next host. :-) But this can vary if the
4701 hosts_max_try limit is hit (see below). It may also be reset if a host
4702 address is looked up here (in case the host was multihomed). */
4704 nexthost = host->next;
4706 /* If the address hasn't yet been obtained from the host name, look it up
4707 now, unless the host is already marked as unusable. If it is marked as
4708 unusable, it means that the router was unable to find its IP address (in
4709 the DNS or wherever) OR we are in the 2nd time round the cutoff loop, and
4710 the lookup failed last time. We don't get this far if *all* MX records
4711 point to non-existent hosts; that is treated as a hard error.
4713 We can just skip this host entirely. When the hosts came from the router,
4714 the address will timeout based on the other host(s); when the address is
4715 looked up below, there is an explicit retry record added.
4717 Note that we mustn't skip unusable hosts if the address is not unset; they
4718 may be needed as expired hosts on the 2nd time round the cutoff loop. */
4722 int new_port, flags;
4724 if (host->status >= hstatus_unusable)
4726 DEBUG(D_transport) debug_printf("%s has no address and is unusable - skipping\n",
4731 DEBUG(D_transport) debug_printf("getting address for %s\n", host->name);
4733 /* The host name is permitted to have an attached port. Find it, and
4734 strip it from the name. Just remember it for now. */
4736 new_port = host_item_get_port(host);
4738 /* Count hosts looked up */
4742 /* Find by name if so configured, or if it's an IP address. We don't
4743 just copy the IP address, because we need the test-for-local to happen. */
4745 flags = HOST_FIND_BY_A | HOST_FIND_BY_AAAA;
4746 if (ob->dns_qualify_single) flags |= HOST_FIND_QUALIFY_SINGLE;
4747 if (ob->dns_search_parents) flags |= HOST_FIND_SEARCH_PARENTS;
4749 if (ob->gethostbyname || string_is_ip_address(host->name, NULL) != 0)
4750 rc = host_find_byname(host, NULL, flags, NULL, TRUE);
4752 rc = host_find_bydns(host, NULL, flags, NULL, NULL, NULL,
4753 &ob->dnssec, /* domains for request/require */
4756 /* Update the host (and any additional blocks, resulting from
4757 multihoming) with a host-specific port, if any. */
4759 for (host_item * hh = host; hh != nexthost; hh = hh->next) hh->port = new_port;
4761 /* Failure to find the host at this time (usually DNS temporary failure)
4762 is really a kind of routing failure rather than a transport failure.
4763 Therefore we add a retry item of the routing kind, not to stop us trying
4764 to look this name up here again, but to ensure the address gets timed
4765 out if the failures go on long enough. A complete failure at this point
4766 commonly points to a configuration error, but the best action is still
4767 to carry on for the next host. */
4769 if (rc == HOST_FIND_AGAIN || rc == HOST_FIND_SECURITY || rc == HOST_FIND_FAILED)
4771 retry_add_item(addrlist, string_sprintf("R:%s", host->name), 0);
4773 if (rc == HOST_FIND_AGAIN) hosts_defer++; else hosts_fail++;
4774 DEBUG(D_transport) debug_printf("rc = %s for %s\n", (rc == HOST_FIND_AGAIN)?
4775 "HOST_FIND_AGAIN" : "HOST_FIND_FAILED", host->name);
4776 host->status = hstatus_unusable;
4778 for (address_item * addr = addrlist; addr; addr = addr->next)
4780 if (addr->transport_return != DEFER) continue;
4781 addr->basic_errno = ERRNO_UNKNOWNHOST;
4782 addr->message = string_sprintf(
4783 rc == HOST_FIND_SECURITY
4784 ? "lookup of IP address for %s was insecure"
4785 : "failed to lookup IP address for %s",
4791 /* If the host is actually the local host, we may have a problem, or
4792 there may be some cunning configuration going on. In the problem case,
4793 log things and give up. The default transport status is already DEFER. */
4795 if (rc == HOST_FOUND_LOCAL && !ob->allow_localhost)
4797 for (address_item * addr = addrlist; addr; addr = addr->next)
4799 addr->basic_errno = 0;
4800 addr->message = string_sprintf("%s transport found host %s to be "
4801 "local", tblock->name, host->name);
4805 } /* End of block for IP address lookup */
4807 /* If this is a continued delivery, we are interested only in the host
4808 which matches the name of the existing open channel. The check is put
4809 here after the local host lookup, in case the name gets expanded as a
4810 result of the lookup. Set expired FALSE, to save the outer loop executing
4813 if (continue_hostname)
4814 if ( Ustrcmp(continue_hostname, host->name) != 0
4815 || Ustrcmp(continue_host_address, host->address) != 0
4819 continue; /* With next host */
4822 continue_host_tried = TRUE;
4824 /* Reset the default next host in case a multihomed host whose addresses
4825 are not looked up till just above added to the host list. */
4827 nexthost = host->next;
4829 /* If queue_smtp is set (-odqs or the first part of a 2-stage run), or the
4830 domain is in queue_smtp_domains, we don't actually want to attempt any
4831 deliveries. When doing a queue run, queue_smtp_domains is always unset. If
4832 there is a lookup defer in queue_smtp_domains, proceed as if the domain
4833 were not in it. We don't want to hold up all SMTP deliveries! Except when
4834 doing a two-stage queue run, don't do this if forcing. */
4836 if ((!f.deliver_force || f.queue_2stage) && (f.queue_smtp ||
4837 match_isinlist(addrlist->domain,
4838 (const uschar **)&queue_smtp_domains, 0,
4839 &domainlist_anchor, NULL, MCL_DOMAIN, TRUE, NULL) == OK))
4842 for (address_item * addr = addrlist; addr; addr = addr->next)
4843 if (addr->transport_return == DEFER)
4844 addr->message = US"domain matches queue_smtp_domains, or -odqs set";
4845 continue; /* With next host */
4848 /* Count hosts being considered - purely for an intelligent comment
4849 if none are usable. */
4853 /* Set $host and $host address now in case they are needed for the
4854 interface expansion or the serialize_hosts check; they remain set if an
4855 actual delivery happens. */
4857 deliver_host = host->name;
4858 deliver_host_address = host->address;
4859 lookup_dnssec_authenticated = host->dnssec == DS_YES ? US"yes"
4860 : host->dnssec == DS_NO ? US"no"
4863 /* Set up a string for adding to the retry key if the port number is not
4864 the standard SMTP port. A host may have its own port setting that overrides
4867 pistring = string_sprintf(":%d", host->port == PORT_NONE
4868 ? defport : host->port);
4869 if (Ustrcmp(pistring, ":25") == 0) pistring = US"";
4871 /* Select IPv4 or IPv6, and choose an outgoing interface. If the interface
4872 string is set, even if constant (as different transports can have different
4873 constant settings), we must add it to the key that is used for retries,
4874 because connections to the same host from a different interface should be
4875 treated separately. */
4877 host_af = Ustrchr(host->address, ':') == NULL ? AF_INET : AF_INET6;
4879 uschar * s = ob->interface;
4882 if (!smtp_get_interface(s, host_af, addrlist, &interface, tid))
4884 pistring = string_sprintf("%s/%s", pistring, interface);
4888 /* The first time round the outer loop, check the status of the host by
4889 inspecting the retry data. The second time round, we are interested only
4890 in expired hosts that haven't been tried since this message arrived. */
4892 if (cutoff_retry == 0)
4895 /* Ensure the status of the address is set by checking retry data if
4896 necessary. There may be host-specific retry data (applicable to all
4897 messages) and also data for retries of a specific message at this host.
4898 If either of these retry records are actually read, the keys used are
4899 returned to save recomputing them later. */
4901 if (exp_bool(addrlist, US"transport", tblock->name, D_transport,
4902 US"retry_include_ip_address", ob->retry_include_ip_address,
4903 ob->expand_retry_include_ip_address, &incl_ip) != OK)
4904 continue; /* with next host */
4906 host_is_expired = retry_check_address(addrlist->domain, host, pistring,
4907 incl_ip, &retry_host_key, &retry_message_key);
4909 DEBUG(D_transport) debug_printf("%s [%s]%s retry-status = %s\n", host->name,
4910 host->address ? host->address : US"", pistring,
4911 host->status == hstatus_usable ? "usable"
4912 : host->status == hstatus_unusable ? "unusable"
4913 : host->status == hstatus_unusable_expired ? "unusable (expired)" : "?");
4915 /* Skip this address if not usable at this time, noting if it wasn't
4916 actually expired, both locally and in the address. */
4918 switch (host->status)
4920 case hstatus_unusable:
4922 setflag(addrlist, af_retry_skipped);
4925 case hstatus_unusable_expired:
4928 case hwhy_retry: hosts_retry++; break;
4929 case hwhy_failed: hosts_fail++; break;
4931 case hwhy_deferred: hosts_defer++; break;
4934 /* If there was a retry message key, implying that previously there
4935 was a message-specific defer, we don't want to update the list of
4936 messages waiting for these hosts. */
4938 if (retry_message_key) update_waiting = FALSE;
4939 continue; /* With the next host or IP address */
4943 /* Second time round the loop: if the address is set but expired, and
4944 the message is newer than the last try, let it through. */
4949 || host->status != hstatus_unusable_expired
4950 || host->last_try > received_time.tv_sec)
4952 DEBUG(D_transport) debug_printf("trying expired host %s [%s]%s\n",
4953 host->name, host->address, pistring);
4954 host_is_expired = TRUE;
4957 /* Setting "expired=FALSE" doesn't actually mean not all hosts are expired;
4958 it remains TRUE only if all hosts are expired and none are actually tried.
4963 /* If this host is listed as one to which access must be serialized,
4964 see if another Exim process has a connection to it, and if so, skip
4965 this host. If not, update the database to record our connection to it
4966 and remember this for later deletion. Do not do any of this if we are
4967 sending the message down a pre-existing connection. */
4969 if ( !continue_hostname
4970 && verify_check_given_host(CUSS &ob->serialize_hosts, host) == OK)
4972 serialize_key = string_sprintf("host-serialize-%s", host->name);
4973 if (!enq_start(serialize_key, 1))
4976 debug_printf("skipping host %s because another Exim process "
4977 "is connected to it\n", host->name);
4983 /* OK, we have an IP address that is not waiting for its retry time to
4984 arrive (it might be expired) OR (second time round the loop) we have an
4985 expired host that hasn't been tried since the message arrived. Have a go
4986 at delivering the message to it. First prepare the addresses by flushing
4987 out the result of previous attempts, and finding the first address that
4988 is still to be delivered. */
4990 first_addr = prepare_addresses(addrlist, host);
4992 DEBUG(D_transport) debug_printf("delivering %s to %s [%s] (%s%s)\n",
4993 message_id, host->name, host->address, addrlist->address,
4994 addrlist->next ? ", ..." : "");
4996 set_process_info("delivering %s to %s [%s]%s (%s%s)",
4997 message_id, host->name, host->address, pistring, addrlist->address,
4998 addrlist->next ? ", ..." : "");
5000 /* This is not for real; don't do the delivery. If there are
5001 any remaining hosts, list them. */
5005 set_errno_nohost(addrlist, 0, NULL, OK, FALSE);
5006 for (address_item * addr = addrlist; addr; addr = addr->next)
5008 addr->host_used = host;
5009 addr->special_action = '*';
5010 addr->message = US"delivery bypassed by -N option";
5014 debug_printf("*** delivery by %s transport bypassed by -N option\n"
5015 "*** host and remaining hosts:\n", tblock->name);
5016 for (host_item * host2 = host; host2; host2 = host2->next)
5017 debug_printf(" %s [%s]\n", host2->name,
5018 host2->address ? host2->address : US"unset");
5023 /* This is for real. If the host is expired, we don't count it for
5024 hosts_max_retry. This ensures that all hosts must expire before an address
5025 is timed out, unless hosts_max_try_hardlimit (which protects against
5026 lunatic DNS configurations) is reached.
5028 If the host is not expired and we are about to hit the hosts_max_retry
5029 limit, check to see if there is a subsequent hosts with a different MX
5030 value. If so, make that the next host, and don't count this one. This is a
5031 heuristic to make sure that different MXs do get tried. With a normal kind
5032 of retry rule, they would get tried anyway when the earlier hosts were
5033 delayed, but if the domain has a "retry every time" type of rule - as is
5034 often used for the the very large ISPs, that won't happen. */
5039 /* Make a copy of the host if it is local to this invocation
5040 of the transport. */
5044 thost = store_get(sizeof(host_item));
5046 thost->name = string_copy(host->name);
5047 thost->address = string_copy(host->address);
5052 if (!host_is_expired && ++unexpired_hosts_tried >= ob->hosts_max_try)
5055 debug_printf("hosts_max_try limit reached with this host\n");
5056 for (host_item * h = host; h; h = h->next) if (h->mx != host->mx)
5059 unexpired_hosts_tried--;
5060 DEBUG(D_transport) debug_printf("however, a higher MX host exists "
5061 "and will be tried\n");
5066 /* Attempt the delivery. */
5068 total_hosts_tried++;
5069 rc = smtp_deliver(addrlist, thost, host_af, defport, interface, tblock,
5070 &message_defer, FALSE);
5073 OK => connection made, each address contains its result;
5074 message_defer is set for message-specific defers (when all
5075 recipients are marked defer)
5076 DEFER => there was a non-message-specific delivery problem;
5077 ERROR => there was a problem setting up the arguments for a filter,
5078 or there was a problem with expanding added headers
5081 /* If the result is not OK, there was a non-message-specific problem.
5082 If the result is DEFER, we need to write to the logs saying what happened
5083 for this particular host, except in the case of authentication and TLS
5084 failures, where the log has already been written. If all hosts defer a
5085 general message is written at the end. */
5087 if (rc == DEFER && first_addr->basic_errno != ERRNO_AUTHFAIL
5088 && first_addr->basic_errno != ERRNO_TLSFAILURE)
5089 write_logs(host, first_addr->message, first_addr->basic_errno);
5091 #ifndef DISABLE_EVENT
5093 deferred_event_raise(first_addr, host);
5096 /* If STARTTLS was accepted, but there was a failure in setting up the
5097 TLS session (usually a certificate screwup), and the host is not in
5098 hosts_require_tls, and tls_tempfail_tryclear is true, try again, with
5099 TLS forcibly turned off. We have to start from scratch with a new SMTP
5100 connection. That's why the retry is done from here, not from within
5101 smtp_deliver(). [Rejections of STARTTLS itself don't screw up the
5102 session, so the in-clear transmission after those errors, if permitted,
5103 happens inside smtp_deliver().] */
5107 && first_addr->basic_errno == ERRNO_TLSFAILURE
5108 && ob->tls_tempfail_tryclear
5109 && verify_check_given_host(CUSS &ob->hosts_require_tls, host) != OK
5112 log_write(0, LOG_MAIN,
5113 "%s: delivering unencrypted to H=%s [%s] (not in hosts_require_tls)",
5114 first_addr->message, host->name, host->address);
5115 first_addr = prepare_addresses(addrlist, host);
5116 rc = smtp_deliver(addrlist, thost, host_af, defport, interface, tblock,
5117 &message_defer, TRUE);
5118 if (rc == DEFER && first_addr->basic_errno != ERRNO_AUTHFAIL)
5119 write_logs(host, first_addr->message, first_addr->basic_errno);
5120 # ifndef DISABLE_EVENT
5122 deferred_event_raise(first_addr, host);
5125 #endif /*SUPPORT_TLS*/
5128 /* Delivery attempt finished */
5130 set_process_info("delivering %s: just tried %s [%s]%s for %s%s: result %s",
5131 message_id, host->name, host->address, pistring, addrlist->address,
5132 addrlist->next ? " (& others)" : "", rc_to_string(rc));
5134 /* Release serialization if set up */
5136 if (serialize_key) enq_end(serialize_key);
5138 /* If the result is DEFER, or if a host retry record is known to exist, we
5139 need to add an item to the retry chain for updating the retry database
5140 at the end of delivery. We only need to add the item to the top address,
5141 of course. Also, if DEFER, we mark the IP address unusable so as to skip it
5142 for any other delivery attempts using the same address. (It is copied into
5143 the unusable tree at the outer level, so even if different address blocks
5144 contain the same address, it still won't get tried again.) */
5146 if (rc == DEFER || retry_host_key)
5148 int delete_flag = rc != DEFER ? rf_delete : 0;
5149 if (!retry_host_key)
5152 if (exp_bool(addrlist, US"transport", tblock->name, D_transport,
5153 US"retry_include_ip_address", ob->retry_include_ip_address,
5154 ob->expand_retry_include_ip_address, &incl_ip) != OK)
5155 incl_ip = TRUE; /* error; use most-specific retry record */
5157 retry_host_key = incl_ip
5158 ? string_sprintf("T:%S:%s%s", host->name, host->address, pistring)
5159 : string_sprintf("T:%S%s", host->name, pistring);
5162 /* If a delivery of another message over an existing SMTP connection
5163 yields DEFER, we do NOT set up retry data for the host. This covers the
5164 case when there are delays in routing the addresses in the second message
5165 that are so long that the server times out. This is alleviated by not
5166 routing addresses that previously had routing defers when handling an
5167 existing connection, but even so, this case may occur (e.g. if a
5168 previously happily routed address starts giving routing defers). If the
5169 host is genuinely down, another non-continued message delivery will
5170 notice it soon enough. */
5172 if (delete_flag != 0 || !continue_hostname)
5173 retry_add_item(first_addr, retry_host_key, rf_host | delete_flag);
5175 /* We may have tried an expired host, if its retry time has come; ensure
5176 the status reflects the expiry for the benefit of any other addresses. */
5180 host->status = host_is_expired
5181 ? hstatus_unusable_expired : hstatus_unusable;
5182 host->why = hwhy_deferred;
5186 /* If message_defer is set (host was OK, but every recipient got deferred
5187 because of some message-specific problem), or if that had happened
5188 previously so that a message retry key exists, add an appropriate item
5189 to the retry chain. Note that if there was a message defer but now there is
5190 a host defer, the message defer record gets deleted. That seems perfectly
5191 reasonable. Also, stop the message from being remembered as waiting
5192 for specific hosts. */
5194 if (message_defer || retry_message_key)
5196 int delete_flag = message_defer ? 0 : rf_delete;
5197 if (!retry_message_key)
5200 if (exp_bool(addrlist, US"transport", tblock->name, D_transport,
5201 US"retry_include_ip_address", ob->retry_include_ip_address,
5202 ob->expand_retry_include_ip_address, &incl_ip) != OK)
5203 incl_ip = TRUE; /* error; use most-specific retry record */
5205 retry_message_key = incl_ip
5206 ? string_sprintf("T:%S:%s%s:%s", host->name, host->address, pistring,
5208 : string_sprintf("T:%S%s:%s", host->name, pistring, message_id);
5210 retry_add_item(addrlist, retry_message_key,
5211 rf_message | rf_host | delete_flag);
5212 update_waiting = FALSE;
5215 /* Any return other than DEFER (that is, OK or ERROR) means that the
5216 addresses have got their final statuses filled in for this host. In the OK
5217 case, see if any of them are deferred. */
5220 for (address_item * addr = addrlist; addr; addr = addr->next)
5221 if (addr->transport_return == DEFER)
5223 some_deferred = TRUE;
5227 /* If no addresses deferred or the result was ERROR, return. We do this for
5228 ERROR because a failing filter set-up or add_headers expansion is likely to
5229 fail for any host we try. */
5231 if (rc == ERROR || (rc == OK && !some_deferred))
5233 DEBUG(D_transport) debug_printf("Leaving %s transport\n", tblock->name);
5234 return TRUE; /* Each address has its status */
5237 /* If the result was DEFER or some individual addresses deferred, let
5238 the loop run to try other hosts with the deferred addresses, except for the
5239 case when we were trying to deliver down an existing channel and failed.
5240 Don't try any other hosts in this case. */
5242 if (continue_hostname) break;
5244 /* If the whole delivery, or some individual addresses, were deferred and
5245 there are more hosts that could be tried, do not count this host towards
5246 the hosts_max_try limit if the age of the message is greater than the
5247 maximum retry time for this host. This means we may try try all hosts,
5248 ignoring the limit, when messages have been around for some time. This is
5249 important because if we don't try all hosts, the address will never time
5250 out. NOTE: this does not apply to hosts_max_try_hardlimit. */
5252 if ((rc == DEFER || some_deferred) && nexthost)
5255 retry_config *retry = retry_find_config(host->name, NULL, 0, 0);
5257 if (retry && retry->rules)
5259 retry_rule *last_rule;
5260 for (last_rule = retry->rules;
5262 last_rule = last_rule->next);
5263 timedout = time(NULL) - received_time.tv_sec > last_rule->timeout;
5265 else timedout = TRUE; /* No rule => timed out */
5269 unexpired_hosts_tried--;
5270 DEBUG(D_transport) debug_printf("temporary delivery error(s) override "
5271 "hosts_max_try (message older than host's retry time)\n");
5277 if (unexpired_hosts_tried >= ob->hosts_max_try)
5278 debug_printf("reached transport hosts_max_try limit %d\n",
5280 if (total_hosts_tried >= ob->hosts_max_try_hardlimit)
5281 debug_printf("reached transport hosts_max_try_hardlimit limit %d\n",
5282 ob->hosts_max_try_hardlimit);
5285 if (f.running_in_test_harness) millisleep(500); /* let server debug out */
5286 } /* End of loop for trying multiple hosts. */
5288 /* If we failed to find a matching host in the list, for an already-open
5289 connection, just close it and start over with the list. This can happen
5290 for routing that changes from run to run, or big multi-IP sites with
5293 if (continue_hostname && !continue_host_tried)
5295 int fd = cutthrough.cctx.sock >= 0 ? cutthrough.cctx.sock : 0;
5297 DEBUG(D_transport) debug_printf("no hosts match already-open connection\n");
5299 /* A TLS conn could be open for a cutthrough, but not for a plain continued-
5301 /*XXX doublecheck that! */
5303 if (cutthrough.cctx.sock >= 0 && cutthrough.is_tls)
5305 (void) tls_write(cutthrough.cctx.tls_ctx, US"QUIT\r\n", 6, FALSE);
5306 tls_close(cutthrough.cctx.tls_ctx, TLS_SHUTDOWN_NOWAIT);
5307 cutthrough.cctx.tls_ctx = NULL;
5308 cutthrough.is_tls = FALSE;
5312 (void) write(fd, US"QUIT\r\n", 6);
5315 cutthrough.cctx.sock = -1;
5316 continue_hostname = NULL;
5317 goto retry_non_continued;
5320 /* This is the end of the loop that repeats iff expired is TRUE and
5321 ob->delay_after_cutoff is FALSE. The second time round we will
5322 try those hosts that haven't been tried since the message arrived. */
5326 debug_printf("all IP addresses skipped or deferred at least one address\n");
5327 if (expired && !ob->delay_after_cutoff && cutoff_retry == 0)
5328 debug_printf("retrying IP addresses not tried since message arrived\n");
5333 /* Get here if all IP addresses are skipped or defer at least one address. In
5334 MUA wrapper mode, this will happen only for connection or other non-message-
5335 specific failures. Force the delivery status for all addresses to FAIL. */
5339 for (address_item * addr = addrlist; addr; addr = addr->next)
5340 addr->transport_return = FAIL;
5344 /* In the normal, non-wrapper case, add a standard message to each deferred
5345 address if there hasn't been an error, that is, if it hasn't actually been
5346 tried this time. The variable "expired" will be FALSE if any deliveries were
5347 actually tried, or if there was at least one host that was not expired. That
5348 is, it is TRUE only if no deliveries were tried and all hosts were expired. If
5349 a delivery has been tried, an error code will be set, and the failing of the
5350 message is handled by the retry code later.
5352 If queue_smtp is set, or this transport was called to send a subsequent message
5353 down an existing TCP/IP connection, and something caused the host not to be
5354 found, we end up here, but can detect these cases and handle them specially. */
5356 for (address_item * addr = addrlist; addr; addr = addr->next)
5358 /* If host is not NULL, it means that we stopped processing the host list
5359 because of hosts_max_try or hosts_max_try_hardlimit. In the former case, this
5360 means we need to behave as if some hosts were skipped because their retry
5361 time had not come. Specifically, this prevents the address from timing out.
5362 However, if we have hit hosts_max_try_hardlimit, we want to behave as if all
5363 hosts were tried. */
5366 if (total_hosts_tried >= ob->hosts_max_try_hardlimit)
5369 debug_printf("hosts_max_try_hardlimit reached: behave as if all "
5370 "hosts were tried\n");
5375 debug_printf("hosts_max_try limit caused some hosts to be skipped\n");
5376 setflag(addr, af_retry_skipped);
5379 if (f.queue_smtp) /* no deliveries attempted */
5381 addr->transport_return = DEFER;
5382 addr->basic_errno = 0;
5383 addr->message = US"SMTP delivery explicitly queued";
5386 else if ( addr->transport_return == DEFER
5387 && (addr->basic_errno == ERRNO_UNKNOWNERROR || addr->basic_errno == 0)
5391 addr->basic_errno = ERRNO_HRETRY;
5392 if (continue_hostname)
5393 addr->message = US"no host found for existing SMTP connection";
5396 setflag(addr, af_pass_message); /* This is not a security risk */
5397 addr->message = string_sprintf(
5398 "all hosts%s have been failing for a long time %s",
5399 addr->domain ? string_sprintf(" for '%s'", addr->domain) : US"",
5400 ob->delay_after_cutoff
5401 ? US"(and retry time not reached)"
5402 : US"and were last tried after this message arrived");
5404 /* If we are already using fallback hosts, or there are no fallback hosts
5405 defined, convert the result to FAIL to cause a bounce. */
5407 if (addr->host_list == addr->fallback_hosts || !addr->fallback_hosts)
5408 addr->transport_return = FAIL;
5413 if (hosts_retry == hosts_total)
5414 s = "retry time not reached for any host%s";
5415 else if (hosts_fail == hosts_total)
5416 s = "all host address lookups%s failed permanently";
5417 else if (hosts_defer == hosts_total)
5418 s = "all host address lookups%s failed temporarily";
5419 else if (hosts_serial == hosts_total)
5420 s = "connection limit reached for all hosts%s";
5421 else if (hosts_fail+hosts_defer == hosts_total)
5422 s = "all host address lookups%s failed";
5424 s = "some host address lookups failed and retry time "
5425 "not reached for other hosts or connection limit reached%s";
5427 addr->message = string_sprintf(s,
5428 addr->domain ? string_sprintf(" for '%s'", addr->domain) : US"");
5433 /* Update the database which keeps information about which messages are waiting
5434 for which hosts to become available. For some message-specific errors, the
5435 update_waiting flag is turned off because we don't want follow-on deliveries in
5436 those cases. If this transport instance is explicitly limited to one message
5437 per connection then follow-on deliveries are not possible and there's no need
5438 to create/update the per-transport wait-<transport_name> database. */
5440 if (update_waiting && tblock->connection_max_messages != 1)
5441 transport_update_waiting(hostlist, tblock->name);
5445 DEBUG(D_transport) debug_printf("Leaving %s transport\n", tblock->name);
5447 return TRUE; /* Each address has its status */
5450 #endif /*!MACRO_PREDEF*/
5453 /* End of transport/smtp.c */