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_FILTER_FAIL: /* Handle a failed filter process error;
597 can't send QUIT as we mustn't end the DATA. */
598 *message = string_sprintf("transport filter process failed (%d)%s",
600 more_errno == EX_EXECFAILED ? ": unable to execute command" : "");
603 case ERRNO_CHHEADER_FAIL: /* Handle a failed add_headers expansion;
604 can't send QUIT as we mustn't end the DATA. */
606 string_sprintf("failed to expand headers_add or headers_remove: %s",
607 expand_string_message);
610 case ERRNO_WRITEINCOMPLETE: /* failure to write a complete data block */
611 *message = string_sprintf("failed to write a data block");
615 case ERRNO_UTF8_FWD: /* no advertised SMTPUTF8, for international message */
616 *message = US"utf8 support required but not offered for forwarding";
617 DEBUG(D_deliver|D_transport) debug_printf("%s\n", *message);
622 /* Handle error responses from the remote mailer. */
626 *message = string_sprintf("SMTP error from remote mail server after %s%s: "
627 "%s", pl, smtp_command, s = string_printing(buffer));
628 *pass_message = TRUE;
633 /* No data was read. If there is no errno, this must be the EOF (i.e.
634 connection closed) case, which causes deferral. An explicit connection reset
635 error has the same effect. Otherwise, put the host's identity in the message,
636 leaving the errno value to be interpreted as well. In all cases, we have to
637 assume the connection is now dead. */
639 if (*errno_value == 0 || *errno_value == ECONNRESET)
641 *errno_value = ERRNO_SMTPCLOSED;
642 *message = US string_sprintf("Remote host closed connection "
643 "in response to %s%s", pl, smtp_command);
646 *message = US string_sprintf("%s [%s]", host->name, host->address);
653 /*************************************************
654 * Write error message to logs *
655 *************************************************/
657 /* This writes to the main log and to the message log.
660 host the current host
661 detail the current message (addr_item->message)
662 basic_errno the errno (addr_item->basic_errno)
668 write_logs(const host_item *host, const uschar *suffix, int basic_errno)
670 gstring * message = LOGGING(outgoing_port)
671 ? string_fmt_append(NULL, "H=%s [%s]:%d", host->name, host->address,
672 host->port == PORT_NONE ? 25 : host->port)
673 : string_fmt_append(NULL, "H=%s [%s]", host->name, host->address);
677 message = string_fmt_append(message, ": %s", suffix);
679 message = string_fmt_append(message, ": %s", strerror(basic_errno));
682 message = string_fmt_append(message, " %s", exim_errstr(basic_errno));
684 log_write(0, LOG_MAIN, "%s", string_from_gstring(message));
685 deliver_msglog("%s %s\n", tod_stamp(tod_log), message->s);
689 msglog_line(host_item * host, uschar * message)
691 deliver_msglog("%s H=%s [%s] %s\n", tod_stamp(tod_log),
692 host->name, host->address, message);
697 #ifndef DISABLE_EVENT
698 /*************************************************
699 * Post-defer action *
700 *************************************************/
702 /* This expands an arbitrary per-transport string.
703 It might, for example, be used to write to the database log.
706 addr the address item containing error information
707 host the current host
713 deferred_event_raise(address_item *addr, host_item *host)
715 uschar * action = addr->transport->event_action;
716 const uschar * save_domain;
722 save_domain = deliver_domain;
723 save_local = deliver_localpart;
725 /*XXX would ip & port already be set up? */
726 deliver_host_address = string_copy(host->address);
727 deliver_host_port = host->port == PORT_NONE ? 25 : host->port;
728 event_defer_errno = addr->basic_errno;
730 router_name = addr->router->name;
731 transport_name = addr->transport->name;
732 deliver_domain = addr->domain;
733 deliver_localpart = addr->local_part;
735 (void) event_raise(action, US"msg:host:defer",
737 ? addr->basic_errno > 0
738 ? string_sprintf("%s: %s", addr->message, strerror(addr->basic_errno))
739 : string_copy(addr->message)
740 : addr->basic_errno > 0
741 ? string_copy(US strerror(addr->basic_errno))
744 deliver_localpart = save_local;
745 deliver_domain = save_domain;
746 router_name = transport_name = NULL;
750 /*************************************************
751 * Reap SMTP specific responses *
752 *************************************************/
754 smtp_discard_responses(smtp_context * sx, smtp_transport_options_block * ob,
757 uschar flushbuffer[4096];
761 if (!smtp_read_response(sx, flushbuffer, sizeof(flushbuffer),
762 '2', ob->command_timeout)
763 && (errno != 0 || flushbuffer[0] == 0))
770 /* Return boolean success */
773 smtp_reap_banner(smtp_context * sx)
775 BOOL good_response = smtp_read_response(sx, sx->buffer, sizeof(sx->buffer),
776 '2', (SOB sx->conn_args.ob)->command_timeout);
777 #ifdef EXPERIMENTAL_DSN_INFO
778 sx->smtp_greeting = string_copy(sx->buffer);
780 return good_response;
784 smtp_reap_ehlo(smtp_context * sx)
786 if (!smtp_read_response(sx, sx->buffer, sizeof(sx->buffer), '2',
787 (SOB sx->conn_args.ob)->command_timeout))
789 if (errno != 0 || sx->buffer[0] == 0 || sx->lmtp)
791 #ifdef EXPERIMENTAL_DSN_INFO
792 sx->helo_response = string_copy(sx->buffer);
798 #ifdef EXPERIMENTAL_DSN_INFO
799 sx->helo_response = string_copy(sx->buffer);
806 #ifdef EXPERIMENTAL_PIPE_CONNECT
808 ehlo_cache_key(const smtp_context * sx)
810 host_item * host = sx->conn_args.host;
811 return Ustrchr(host->address, ':')
812 ? string_sprintf("[%s]:%d.EHLO", host->address,
813 host->port == PORT_NONE ? sx->port : host->port)
814 : string_sprintf("%s:%d.EHLO", host->address,
815 host->port == PORT_NONE ? sx->port : host->port);
819 write_ehlo_cache_entry(const smtp_context * sx)
821 open_db dbblock, * dbm_file;
823 if ((dbm_file = dbfn_open(US"misc", O_RDWR, &dbblock, TRUE)))
825 uschar * ehlo_resp_key = ehlo_cache_key(sx);
826 dbdata_ehlo_resp er = { .data = sx->ehlo_resp };
828 dbfn_write(dbm_file, ehlo_resp_key, &er, (int)sizeof(er));
829 dbfn_close(dbm_file);
834 invalidate_ehlo_cache_entry(smtp_context * sx)
836 open_db dbblock, * dbm_file;
838 if ( sx->early_pipe_active
839 && (dbm_file = dbfn_open(US"misc", O_RDWR, &dbblock, TRUE)))
841 uschar * ehlo_resp_key = ehlo_cache_key(sx);
842 dbfn_delete(dbm_file, ehlo_resp_key);
843 dbfn_close(dbm_file);
848 read_ehlo_cache_entry(smtp_context * sx)
853 if (!(dbm_file = dbfn_open(US"misc", O_RDONLY, &dbblock, FALSE)))
854 { DEBUG(D_transport) debug_printf("ehlo-cache: no misc DB\n"); }
857 uschar * ehlo_resp_key = ehlo_cache_key(sx);
858 dbdata_ehlo_resp * er;
860 if (!(er = dbfn_read(dbm_file, ehlo_resp_key)))
861 { DEBUG(D_transport) debug_printf("no ehlo-resp record\n"); }
862 else if (time(NULL) - er->time_stamp > retry_data_expire)
864 DEBUG(D_transport) debug_printf("ehlo-resp record too old\n");
865 dbfn_close(dbm_file);
866 if ((dbm_file = dbfn_open(US"misc", O_RDWR, &dbblock, TRUE)))
867 dbfn_delete(dbm_file, ehlo_resp_key);
871 sx->ehlo_resp = er->data;
872 dbfn_close(dbm_file);
873 DEBUG(D_transport) debug_printf(
874 "EHLO response bits from cache: cleartext 0x%04x crypted 0x%04x\n",
875 er->data.cleartext_features, er->data.crypted_features);
878 dbfn_close(dbm_file);
885 /* Return an auths bitmap for the set of AUTH methods offered by the server
886 which match our authenticators. */
888 static unsigned short
889 study_ehlo_auths(smtp_context * sx)
894 unsigned short authbits = 0;
896 if (!sx->esmtp) return 0;
897 if (!regex_AUTH) regex_AUTH = regex_must_compile(AUTHS_REGEX, FALSE, TRUE);
898 if (!regex_match_and_setup(regex_AUTH, sx->buffer, 0, -1)) return 0;
899 expand_nmax = -1; /* reset */
900 names = string_copyn(expand_nstring[1], expand_nlength[1]);
902 for (au = auths, authnum = 0; au; au = au->next, authnum++) if (au->client)
904 const uschar * list = names;
908 while (string_nextinlist(&list, &sep, name, sizeof(name)))
909 if (strcmpic(au->public_name, name) == 0)
910 { authbits |= BIT(authnum); break; }
914 debug_printf("server offers %s AUTH, methods '%s', bitmap 0x%04x\n",
915 tls_out.active.sock >= 0 ? "crypted" : "plaintext", names, authbits);
917 if (tls_out.active.sock >= 0)
918 sx->ehlo_resp.crypted_auths = authbits;
920 sx->ehlo_resp.cleartext_auths = authbits;
927 /* Wait for and check responses for early-pipelining.
929 Called from the lower-level smtp_read_response() function
930 used for general code that assume synchronisation, if context
931 flags indicate outstanding early-pipelining commands. Also
932 called fom sync_responses() which handles pipelined commands.
935 sx smtp connection context
936 countp number of outstanding responses, adjusted on return
940 FAIL SMTP error in response
943 smtp_reap_early_pipe(smtp_context * sx, int * countp)
945 BOOL pending_BANNER = sx->pending_BANNER;
946 BOOL pending_EHLO = sx->pending_EHLO;
948 sx->pending_BANNER = FALSE; /* clear early to avoid recursion */
949 sx->pending_EHLO = FALSE;
953 DEBUG(D_transport) debug_printf("%s expect banner\n", __FUNCTION__);
955 if (!smtp_reap_banner(sx))
957 DEBUG(D_transport) debug_printf("bad banner\n");
964 unsigned peer_offered;
965 unsigned short authbits = 0, * ap;
967 DEBUG(D_transport) debug_printf("%s expect ehlo\n", __FUNCTION__);
969 if (!smtp_reap_ehlo(sx))
971 DEBUG(D_transport) debug_printf("bad response for EHLO\n");
975 /* Compare the actual EHLO response to the cached value we assumed;
976 on difference, dump or rewrite the cache and arrange for a retry. */
978 ap = tls_out.active.sock < 0
979 ? &sx->ehlo_resp.cleartext_auths : &sx->ehlo_resp.crypted_auths;
981 peer_offered = ehlo_response(sx->buffer,
982 (tls_out.active.sock < 0 ? OPTION_TLS : OPTION_REQUIRETLS)
983 | OPTION_CHUNKING | OPTION_PRDR | OPTION_DSN | OPTION_PIPE | OPTION_SIZE
984 | OPTION_UTF8 | OPTION_EARLY_PIPE
986 if ( peer_offered != sx->peer_offered
987 || (authbits = study_ehlo_auths(sx)) != *ap)
990 debug_printf("EHLO extensions changed, 0x%04x/0x%04x -> 0x%04x/0x%04x\n",
991 sx->peer_offered, *ap, peer_offered, authbits);
993 if (peer_offered & OPTION_EARLY_PIPE)
994 write_ehlo_cache_entry(sx);
996 invalidate_ehlo_cache_entry(sx);
998 return OK; /* just carry on */
1004 invalidate_ehlo_cache_entry(sx);
1005 (void) smtp_discard_responses(sx, sx->conn_args.ob, *countp);
1011 /*************************************************
1012 * Synchronize SMTP responses *
1013 *************************************************/
1015 /* This function is called from smtp_deliver() to receive SMTP responses from
1016 the server, and match them up with the commands to which they relate. When
1017 PIPELINING is not in use, this function is called after every command, and is
1018 therefore somewhat over-engineered, but it is simpler to use a single scheme
1019 that works both with and without PIPELINING instead of having two separate sets
1022 The set of commands that are buffered up with pipelining may start with MAIL
1023 and may end with DATA; in between are RCPT commands that correspond to the
1024 addresses whose status is PENDING_DEFER. All other commands (STARTTLS, AUTH,
1025 etc.) are never buffered.
1027 Errors after MAIL or DATA abort the whole process leaving the response in the
1028 buffer. After MAIL, pending responses are flushed, and the original command is
1029 re-instated in big_buffer for error messages. For RCPT commands, the remote is
1030 permitted to reject some recipient addresses while accepting others. However
1031 certain errors clearly abort the whole process. Set the value in
1032 transport_return to PENDING_OK if the address is accepted. If there is a
1033 subsequent general error, it will get reset accordingly. If not, it will get
1034 converted to OK at the end.
1037 sx smtp connection context
1038 count the number of responses to read
1039 pending_DATA 0 if last command sent was not DATA
1040 +1 if previously had a good recipient
1041 -1 if not previously had a good recipient
1043 Returns: 3 if at least one address had 2xx and one had 5xx
1044 2 if at least one address had 5xx but none had 2xx
1045 1 if at least one host had a 2xx response, but none had 5xx
1046 0 no address had 2xx or 5xx but no errors (all 4xx, or just DATA)
1047 -1 timeout while reading RCPT response
1048 -2 I/O or other non-response error for RCPT
1049 -3 DATA or MAIL failed - errno and buffer set
1050 -4 banner or EHLO failed (early-pipelining)
1054 sync_responses(smtp_context * sx, int count, int pending_DATA)
1056 address_item * addr = sx->sync_addr;
1057 smtp_transport_options_block * ob = sx->conn_args.ob;
1060 #ifdef EXPERIMENTAL_PIPE_CONNECT
1061 if (smtp_reap_early_pipe(sx, &count) != OK)
1065 /* Handle the response for a MAIL command. On error, reinstate the original
1066 command in big_buffer for error message use, and flush any further pending
1067 responses before returning, except after I/O errors and timeouts. */
1069 if (sx->pending_MAIL)
1071 DEBUG(D_transport) debug_printf("%s expect mail\n", __FUNCTION__);
1073 if (!smtp_read_response(sx, sx->buffer, sizeof(sx->buffer),
1074 '2', ob->command_timeout))
1076 DEBUG(D_transport) debug_printf("bad response for MAIL\n");
1077 Ustrcpy(big_buffer, mail_command); /* Fits, because it came from there! */
1078 if (errno == 0 && sx->buffer[0] != 0)
1081 if (sx->buffer[0] == '4')
1083 save_errno = ERRNO_MAIL4XX;
1084 addr->more_errno |= ((sx->buffer[1] - '0')*10 + sx->buffer[2] - '0') << 8;
1086 count = smtp_discard_responses(sx, ob, count);
1090 if (pending_DATA) count--; /* Number of RCPT responses to come */
1091 while (count-- > 0) /* Mark any pending addrs with the host used */
1093 while (addr->transport_return != PENDING_DEFER) addr = addr->next;
1094 addr->host_used = sx->conn_args.host;
1101 if (pending_DATA) count--; /* Number of RCPT responses to come */
1103 /* Read and handle the required number of RCPT responses, matching each one up
1104 with an address by scanning for the next address whose status is PENDING_DEFER.
1109 while (addr->transport_return != PENDING_DEFER)
1110 if (!(addr = addr->next))
1113 /* The address was accepted */
1114 addr->host_used = sx->conn_args.host;
1116 DEBUG(D_transport) debug_printf("%s expect rcpt\n", __FUNCTION__);
1117 if (smtp_read_response(sx, sx->buffer, sizeof(sx->buffer),
1118 '2', ob->command_timeout))
1121 addr->transport_return = PENDING_OK;
1123 /* If af_dr_retry_exists is set, there was a routing delay on this address;
1124 ensure that any address-specific retry record is expunged. We do this both
1125 for the basic key and for the version that also includes the sender. */
1127 if (testflag(addr, af_dr_retry_exists))
1129 uschar *altkey = string_sprintf("%s:<%s>", addr->address_retry_key,
1131 retry_add_item(addr, altkey, rf_delete);
1132 retry_add_item(addr, addr->address_retry_key, rf_delete);
1136 /* Timeout while reading the response */
1138 else if (errno == ETIMEDOUT)
1140 uschar *message = string_sprintf("SMTP timeout after RCPT TO:<%s>",
1141 transport_rcpt_address(addr, sx->conn_args.tblock->rcpt_include_affixes));
1142 set_errno_nohost(sx->first_addr, ETIMEDOUT, message, DEFER, FALSE);
1143 retry_add_item(addr, addr->address_retry_key, 0);
1144 update_waiting = FALSE;
1148 /* Handle other errors in obtaining an SMTP response by returning -1. This
1149 will cause all the addresses to be deferred. Restore the SMTP command in
1150 big_buffer for which we are checking the response, so the error message
1153 else if (errno != 0 || sx->buffer[0] == 0)
1155 string_format(big_buffer, big_buffer_size, "RCPT TO:<%s>",
1156 transport_rcpt_address(addr, sx->conn_args.tblock->rcpt_include_affixes));
1160 /* Handle SMTP permanent and temporary response codes. */
1165 string_sprintf("SMTP error from remote mail server after RCPT TO:<%s>: "
1166 "%s", transport_rcpt_address(addr, sx->conn_args.tblock->rcpt_include_affixes),
1167 string_printing(sx->buffer));
1168 setflag(addr, af_pass_message);
1170 msglog_line(sx->conn_args.host, addr->message);
1172 /* The response was 5xx */
1174 if (sx->buffer[0] == '5')
1176 addr->transport_return = FAIL;
1180 /* The response was 4xx */
1184 addr->transport_return = DEFER;
1185 addr->basic_errno = ERRNO_RCPT4XX;
1186 addr->more_errno |= ((sx->buffer[1] - '0')*10 + sx->buffer[2] - '0') << 8;
1190 #ifndef DISABLE_EVENT
1191 event_defer_errno = addr->more_errno;
1192 msg_event_raise(US"msg:rcpt:host:defer", addr);
1195 /* Log temporary errors if there are more hosts to be tried.
1196 If not, log this last one in the == line. */
1198 if (sx->conn_args.host->next)
1199 if (LOGGING(outgoing_port))
1200 log_write(0, LOG_MAIN, "H=%s [%s]:%d %s", sx->conn_args.host->name,
1201 sx->conn_args.host->address,
1202 sx->port == PORT_NONE ? 25 : sx->port, addr->message);
1204 log_write(0, LOG_MAIN, "H=%s [%s]: %s", sx->conn_args.host->name,
1205 sx->conn_args.host->address, addr->message);
1207 #ifndef DISABLE_EVENT
1209 msg_event_raise(US"msg:rcpt:defer", addr);
1212 /* Do not put this message on the list of those waiting for specific
1213 hosts, as otherwise it is likely to be tried too often. */
1215 update_waiting = FALSE;
1217 /* Add a retry item for the address so that it doesn't get tried again
1218 too soon. If address_retry_include_sender is true, add the sender address
1219 to the retry key. */
1221 retry_add_item(addr,
1222 ob->address_retry_include_sender
1223 ? string_sprintf("%s:<%s>", addr->address_retry_key, sender_address)
1224 : addr->address_retry_key,
1229 } /* Loop for next RCPT response */
1231 /* Update where to start at for the next block of responses, unless we
1232 have already handled all the addresses. */
1234 if (addr) sx->sync_addr = addr->next;
1236 /* Handle a response to DATA. If we have not had any good recipients, either
1237 previously or in this block, the response is ignored. */
1239 if (pending_DATA != 0)
1241 DEBUG(D_transport) debug_printf("%s expect data\n", __FUNCTION__);
1242 if (!smtp_read_response(sx, sx->buffer, sizeof(sx->buffer),
1243 '3', ob->command_timeout))
1248 if (pending_DATA > 0 || (yield & 1) != 0)
1250 if (errno == 0 && sx->buffer[0] == '4')
1252 errno = ERRNO_DATA4XX;
1253 sx->first_addr->more_errno |= ((sx->buffer[1] - '0')*10 + sx->buffer[2] - '0') << 8;
1257 (void)check_response(sx->conn_args.host, &errno, 0, sx->buffer, &code, &msg, &pass_message);
1258 DEBUG(D_transport) debug_printf("%s\nerror for DATA ignored: pipelining "
1259 "is in use and there were no good recipients\n", msg);
1263 /* All responses read and handled; MAIL (if present) received 2xx and DATA (if
1264 present) received 3xx. If any RCPTs were handled and yielded anything other
1265 than 4xx, yield will be set non-zero. */
1274 /* Try an authenticator's client entry */
1277 try_authenticator(smtp_context * sx, auth_instance * au)
1279 smtp_transport_options_block * ob = sx->conn_args.ob; /* transport options */
1280 host_item * host = sx->conn_args.host; /* host to deliver to */
1283 sx->outblock.authenticating = TRUE;
1284 rc = (au->info->clientcode)(au, sx, ob->command_timeout,
1285 sx->buffer, sizeof(sx->buffer));
1286 sx->outblock.authenticating = FALSE;
1287 DEBUG(D_transport) debug_printf("%s authenticator yielded %d\n", au->name, rc);
1289 /* A temporary authentication failure must hold up delivery to
1290 this host. After a permanent authentication failure, we carry on
1291 to try other authentication methods. If all fail hard, try to
1292 deliver the message unauthenticated unless require_auth was set. */
1297 f.smtp_authenticated = TRUE; /* stops the outer loop */
1298 client_authenticator = au->name;
1299 if (au->set_client_id)
1300 client_authenticated_id = expand_string(au->set_client_id);
1303 /* Failure after writing a command */
1308 /* Failure after reading a response */
1311 if (errno != 0 || sx->buffer[0] != '5') return FAIL;
1312 log_write(0, LOG_MAIN, "%s authenticator failed H=%s [%s] %s",
1313 au->name, host->name, host->address, sx->buffer);
1316 /* Failure by some other means. In effect, the authenticator
1317 decided it wasn't prepared to handle this case. Typically this
1318 is the result of "fail" in an expansion string. Do we need to
1319 log anything here? Feb 2006: a message is now put in the buffer
1320 if logging is required. */
1323 if (*sx->buffer != 0)
1324 log_write(0, LOG_MAIN, "%s authenticator cancelled "
1325 "authentication H=%s [%s] %s", au->name, host->name,
1326 host->address, sx->buffer);
1329 /* Internal problem, message in buffer. */
1332 set_errno_nohost(sx->addrlist, ERRNO_AUTHPROB, string_copy(sx->buffer),
1342 /* Do the client side of smtp-level authentication.
1345 sx smtp connection context
1347 sx->buffer should have the EHLO response from server (gets overwritten)
1350 OK Success, or failed (but not required): global "smtp_authenticated" set
1351 DEFER Failed authentication (and was required)
1352 ERROR Internal problem
1354 FAIL_SEND Failed communications - transmit
1359 smtp_auth(smtp_context * sx)
1361 host_item * host = sx->conn_args.host; /* host to deliver to */
1362 smtp_transport_options_block * ob = sx->conn_args.ob; /* transport options */
1363 int require_auth = verify_check_given_host(CUSS &ob->hosts_require_auth, host);
1364 #ifdef EXPERIMENTAL_PIPE_CONNECT
1365 unsigned short authbits = tls_out.active.sock >= 0
1366 ? sx->ehlo_resp.crypted_auths : sx->ehlo_resp.cleartext_auths;
1368 uschar * fail_reason = US"server did not advertise AUTH support";
1370 f.smtp_authenticated = FALSE;
1371 client_authenticator = client_authenticated_id = client_authenticated_sender = NULL;
1374 regex_AUTH = regex_must_compile(AUTHS_REGEX, FALSE, TRUE);
1376 /* Is the server offering AUTH? */
1380 #ifdef EXPERIMENTAL_PIPE_CONNECT
1381 sx->early_pipe_active ? authbits
1384 regex_match_and_setup(regex_AUTH, sx->buffer, 0, -1)
1387 uschar * names = NULL;
1388 expand_nmax = -1; /* reset */
1390 #ifdef EXPERIMENTAL_PIPE_CONNECT
1391 if (!sx->early_pipe_active)
1393 names = string_copyn(expand_nstring[1], expand_nlength[1]);
1395 /* Must not do this check until after we have saved the result of the
1396 regex match above as the check could be another RE. */
1398 if ( require_auth == OK
1399 || verify_check_given_host(CUSS &ob->hosts_try_auth, host) == OK)
1403 DEBUG(D_transport) debug_printf("scanning authentication mechanisms\n");
1404 fail_reason = US"no common mechanisms were found";
1406 #ifdef EXPERIMENTAL_PIPE_CONNECT
1407 if (sx->early_pipe_active)
1409 /* Scan our authenticators (which support use by a client and were offered
1410 by the server (checked at cache-write time)), not suppressed by
1411 client_condition. If one is found, attempt to authenticate by calling its
1412 client function. We are limited to supporting up to 16 authenticator
1413 public-names by the number of bits in a short. */
1418 for (bitnum = 0, au = auths;
1419 !f.smtp_authenticated && au && bitnum < 16;
1420 bitnum++, au = au->next) if (authbits & BIT(bitnum))
1422 if ( au->client_condition
1423 && !expand_check_condition(au->client_condition, au->name,
1424 US"client authenticator"))
1426 DEBUG(D_transport) debug_printf("skipping %s authenticator: %s\n",
1427 au->name, "client_condition is false");
1431 /* Found data for a listed mechanism. Call its client entry. Set
1432 a flag in the outblock so that data is overwritten after sending so
1433 that reflections don't show it. */
1435 fail_reason = US"authentication attempt(s) failed";
1437 if ((rc = try_authenticator(sx, au)) != OK)
1444 /* Scan the configured authenticators looking for one which is configured
1445 for use as a client, which is not suppressed by client_condition, and
1446 whose name matches an authentication mechanism supported by the server.
1447 If one is found, attempt to authenticate by calling its client function.
1450 for (auth_instance * au = auths; !f.smtp_authenticated && au; au = au->next)
1455 || ( au->client_condition
1456 && !expand_check_condition(au->client_condition, au->name,
1457 US"client authenticator")))
1459 DEBUG(D_transport) debug_printf("skipping %s authenticator: %s\n",
1461 (au->client)? "client_condition is false" :
1462 "not configured as a client");
1466 /* Loop to scan supported server mechanisms */
1470 int len = Ustrlen(au->public_name);
1473 while (isspace(*p)) p++;
1475 if (strncmpic(au->public_name, p, len) != 0 ||
1476 (p[len] != 0 && !isspace(p[len])))
1478 while (*p != 0 && !isspace(*p)) p++;
1482 /* Found data for a listed mechanism. Call its client entry. Set
1483 a flag in the outblock so that data is overwritten after sending so
1484 that reflections don't show it. */
1486 fail_reason = US"authentication attempt(s) failed";
1488 if ((rc = try_authenticator(sx, au)) != OK)
1491 break; /* If not authenticated, try next authenticator */
1492 } /* Loop for scanning supported server mechanisms */
1493 } /* Loop for further authenticators */
1497 /* If we haven't authenticated, but are required to, give up. */
1499 if (require_auth == OK && !f.smtp_authenticated)
1501 set_errno_nohost(sx->addrlist, ERRNO_AUTHFAIL,
1502 string_sprintf("authentication required but %s", fail_reason), DEFER,
1511 /* Construct AUTH appendix string for MAIL TO */
1514 buffer to build string
1515 addrlist chain of potential addresses to deliver
1516 ob transport options
1518 Globals f.smtp_authenticated
1519 client_authenticated_sender
1520 Return True on error, otherwise buffer has (possibly empty) terminated string
1524 smtp_mail_auth_str(uschar *buffer, unsigned bufsize, address_item *addrlist,
1525 smtp_transport_options_block *ob)
1527 uschar *local_authenticated_sender = authenticated_sender;
1530 debug_printf("smtp_mail_auth_str: as<%s> os<%s> SA<%s>\n", authenticated_sender, ob->authenticated_sender, f.smtp_authenticated?"Y":"N");
1533 if (ob->authenticated_sender != NULL)
1535 uschar *new = expand_string(ob->authenticated_sender);
1538 if (!f.expand_string_forcedfail)
1540 uschar *message = string_sprintf("failed to expand "
1541 "authenticated_sender: %s", expand_string_message);
1542 set_errno_nohost(addrlist, ERRNO_EXPANDFAIL, message, DEFER, FALSE);
1546 else if (new[0] != 0) local_authenticated_sender = new;
1549 /* Add the authenticated sender address if present */
1551 if ((f.smtp_authenticated || ob->authenticated_sender_force) &&
1552 local_authenticated_sender != NULL)
1554 string_format(buffer, bufsize, " AUTH=%s",
1555 auth_xtextencode(local_authenticated_sender,
1556 Ustrlen(local_authenticated_sender)));
1557 client_authenticated_sender = string_copy(local_authenticated_sender);
1568 /* Lookup TLSA record for host/port.
1569 Return: OK success with dnssec; DANE mode
1570 DEFER Do not use this host now, may retry later
1571 FAIL_FORCED No TLSA record; DANE not usable
1572 FAIL Do not use this connection
1576 tlsa_lookup(const host_item * host, dns_answer * dnsa, BOOL dane_required)
1578 /* move this out to host.c given the similarity to dns_lookup() ? */
1580 const uschar * fullname = buffer;
1584 /* TLSA lookup string */
1585 (void)sprintf(CS buffer, "_%d._tcp.%.256s", host->port, host->name);
1587 rc = dns_lookup(dnsa, buffer, T_TLSA, &fullname);
1588 sec = dns_is_secure(dnsa);
1590 debug_printf("TLSA lookup ret %d %sDNSSEC\n", rc, sec ? "" : "not ");
1595 return DEFER; /* just defer this TLS'd conn */
1603 for (dns_record * rr = dns_next_rr(dnsa, &dnss, RESET_ANSWERS); rr;
1604 rr = dns_next_rr(dnsa, &dnss, RESET_NEXT))
1605 if (rr->type == T_TLSA && rr->size > 3)
1607 uint16_t payload_length = rr->size - 3;
1608 uschar s[MAX_TLSA_EXPANDED_SIZE], * sp = s, * p = US rr->data;
1610 sp += sprintf(CS sp, "%d ", *p++); /* usage */
1611 sp += sprintf(CS sp, "%d ", *p++); /* selector */
1612 sp += sprintf(CS sp, "%d ", *p++); /* matchtype */
1613 while (payload_length-- > 0 && sp-s < (MAX_TLSA_EXPANDED_SIZE - 4))
1614 sp += sprintf(CS sp, "%02x", *p++);
1616 debug_printf(" %s\n", s);
1621 log_write(0, LOG_MAIN,
1622 "DANE error: TLSA lookup for %s not DNSSEC", host->name);
1625 case DNS_NODATA: /* no TLSA RR for this lookup */
1626 case DNS_NOMATCH: /* no records at all for this lookup */
1627 return dane_required ? FAIL : FAIL_FORCED;
1631 return dane_required ? FAIL : DEFER;
1638 typedef struct smtp_compare_s
1640 uschar *current_sender_address;
1641 struct transport_instance *tblock;
1645 /* Create a unique string that identifies this message, it is based on
1646 sender_address, helo_data and tls_certificate if enabled.
1650 smtp_local_identity(uschar * sender, struct transport_instance * tblock)
1652 address_item * addr1;
1653 uschar * if1 = US"";
1654 uschar * helo1 = US"";
1656 uschar * tlsc1 = US"";
1658 uschar * save_sender_address = sender_address;
1659 uschar * local_identity = NULL;
1660 smtp_transport_options_block * ob = SOB tblock->options_block;
1662 sender_address = sender;
1664 addr1 = deliver_make_addr (sender, TRUE);
1665 deliver_set_expansions(addr1);
1668 if1 = expand_string(ob->interface);
1671 helo1 = expand_string(ob->helo_data);
1674 if (ob->tls_certificate)
1675 tlsc1 = expand_string(ob->tls_certificate);
1676 local_identity = string_sprintf ("%s^%s^%s", if1, helo1, tlsc1);
1678 local_identity = string_sprintf ("%s^%s", if1, helo1);
1681 deliver_set_expansions(NULL);
1682 sender_address = save_sender_address;
1684 return local_identity;
1689 /* This routine is a callback that is called from transport_check_waiting.
1690 This function will evaluate the incoming message versus the previous
1691 message. If the incoming message is using a different local identity then
1692 we will veto this new message. */
1695 smtp_are_same_identities(uschar * message_id, smtp_compare_t * s_compare)
1697 uschar * message_local_identity,
1698 * current_local_identity,
1699 * new_sender_address;
1701 current_local_identity =
1702 smtp_local_identity(s_compare->current_sender_address, s_compare->tblock);
1704 if (!(new_sender_address = deliver_get_sender_address(message_id)))
1707 message_local_identity =
1708 smtp_local_identity(new_sender_address, s_compare->tblock);
1710 return Ustrcmp(current_local_identity, message_local_identity) == 0;
1716 ehlo_response(uschar * buf, unsigned checks)
1718 size_t bsize = Ustrlen(buf);
1720 /* debug_printf("%s: check for 0x%04x\n", __FUNCTION__, checks); */
1723 # ifdef EXPERIMENTAL_REQUIRETLS
1724 if ( checks & OPTION_REQUIRETLS
1725 && pcre_exec(regex_REQUIRETLS, NULL, CS buf,bsize, 0, PCRE_EOPT, NULL,0) < 0)
1727 checks &= ~OPTION_REQUIRETLS;
1729 if ( checks & OPTION_TLS
1730 && pcre_exec(regex_STARTTLS, NULL, CS buf, bsize, 0, PCRE_EOPT, NULL, 0) < 0)
1732 checks &= ~OPTION_TLS;
1734 if ( checks & OPTION_IGNQ
1735 && pcre_exec(regex_IGNOREQUOTA, NULL, CS buf, bsize, 0,
1736 PCRE_EOPT, NULL, 0) < 0)
1737 checks &= ~OPTION_IGNQ;
1739 if ( checks & OPTION_CHUNKING
1740 && pcre_exec(regex_CHUNKING, NULL, CS buf, bsize, 0, PCRE_EOPT, NULL, 0) < 0)
1741 checks &= ~OPTION_CHUNKING;
1743 #ifndef DISABLE_PRDR
1744 if ( checks & OPTION_PRDR
1745 && pcre_exec(regex_PRDR, NULL, CS buf, bsize, 0, PCRE_EOPT, NULL, 0) < 0)
1747 checks &= ~OPTION_PRDR;
1750 if ( checks & OPTION_UTF8
1751 && pcre_exec(regex_UTF8, NULL, CS buf, bsize, 0, PCRE_EOPT, NULL, 0) < 0)
1753 checks &= ~OPTION_UTF8;
1755 if ( checks & OPTION_DSN
1756 && pcre_exec(regex_DSN, NULL, CS buf, bsize, 0, PCRE_EOPT, NULL, 0) < 0)
1757 checks &= ~OPTION_DSN;
1759 if ( checks & OPTION_PIPE
1760 && pcre_exec(regex_PIPELINING, NULL, CS buf, bsize, 0,
1761 PCRE_EOPT, NULL, 0) < 0)
1762 checks &= ~OPTION_PIPE;
1764 if ( checks & OPTION_SIZE
1765 && pcre_exec(regex_SIZE, NULL, CS buf, bsize, 0, PCRE_EOPT, NULL, 0) < 0)
1766 checks &= ~OPTION_SIZE;
1768 #ifdef EXPERIMENTAL_PIPE_CONNECT
1769 if ( checks & OPTION_EARLY_PIPE
1770 && pcre_exec(regex_EARLY_PIPE, NULL, CS buf, bsize, 0,
1771 PCRE_EOPT, NULL, 0) < 0)
1773 checks &= ~OPTION_EARLY_PIPE;
1775 /* debug_printf("%s: found 0x%04x\n", __FUNCTION__, checks); */
1781 /* Callback for emitting a BDAT data chunk header.
1783 If given a nonzero size, first flush any buffered SMTP commands
1784 then emit the command.
1786 Reap previous SMTP command responses if requested, and always reap
1787 the response from a previous BDAT command.
1790 tctx transport context
1791 chunk_size value for SMTP BDAT command
1793 tc_chunk_last add LAST option to SMTP BDAT command
1794 tc_reap_prev reap response to previous SMTP commands
1796 Returns: OK or ERROR
1800 smtp_chunk_cmd_callback(transport_ctx * tctx, unsigned chunk_size,
1803 smtp_transport_options_block * ob = SOB tctx->tblock->options_block;
1804 smtp_context * sx = tctx->smtp_context;
1808 /* Write SMTP chunk header command. If not reaping responses, note that
1809 there may be more writes (like, the chunk data) done soon. */
1813 #ifdef EXPERIMENTAL_PIPE_CONNECT
1814 BOOL new_conn = !!(sx->outblock.conn_args);
1816 if((cmd_count = smtp_write_command(sx,
1817 flags & tc_reap_prev ? SCMD_FLUSH : SCMD_MORE,
1818 "BDAT %u%s\r\n", chunk_size, flags & tc_chunk_last ? " LAST" : "")
1819 ) < 0) return ERROR;
1820 if (flags & tc_chunk_last)
1821 data_command = string_copy(big_buffer); /* Save for later error message */
1822 #ifdef EXPERIMENTAL_PIPE_CONNECT
1823 /* That command write could have been the one that made the connection.
1824 Copy the fd from the client conn ctx (smtp transport specific) to the
1825 generic transport ctx. */
1828 tctx->u.fd = sx->outblock.cctx->sock;
1832 prev_cmd_count = cmd_count += sx->cmd_count;
1834 /* Reap responses for any previous, but not one we just emitted */
1838 if (sx->pending_BDAT)
1841 if (flags & tc_reap_prev && prev_cmd_count > 0)
1843 DEBUG(D_transport) debug_printf("look for %d responses"
1844 " for previous pipelined cmds\n", prev_cmd_count);
1846 switch(sync_responses(sx, prev_cmd_count, 0))
1848 case 1: /* 2xx (only) => OK */
1849 case 3: sx->good_RCPT = TRUE; /* 2xx & 5xx => OK & progress made */
1850 case 2: sx->completed_addr = TRUE; /* 5xx (only) => progress made */
1851 case 0: break; /* No 2xx or 5xx, but no probs */
1853 case -1: /* Timeout on RCPT */
1854 #ifdef EXPERIMENTAL_PIPE_CONNECT
1855 case -4: /* non-2xx for pipelined banner or EHLO */
1857 default: return ERROR; /* I/O error, or any MAIL/DATA error */
1860 if (!sx->pending_BDAT)
1861 pipelining_active = FALSE;
1864 /* Reap response for an outstanding BDAT */
1866 if (sx->pending_BDAT)
1868 DEBUG(D_transport) debug_printf("look for one response for BDAT\n");
1870 if (!smtp_read_response(sx, sx->buffer, sizeof(sx->buffer), '2',
1871 ob->command_timeout))
1873 if (errno == 0 && sx->buffer[0] == '4')
1875 errno = ERRNO_DATA4XX; /*XXX does this actually get used? */
1876 sx->addrlist->more_errno |=
1877 ((sx->buffer[1] - '0')*10 + sx->buffer[2] - '0') << 8;
1882 sx->pending_BDAT = FALSE;
1883 pipelining_active = FALSE;
1885 else if (chunk_size > 0)
1886 sx->pending_BDAT = TRUE;
1889 sx->cmd_count = cmd_count;
1897 /*************************************************
1898 * Make connection for given message *
1899 *************************************************/
1903 ctx connection context
1904 suppress_tls if TRUE, don't attempt a TLS connection - this is set for
1905 a second attempt after TLS initialization fails
1907 Returns: OK - the connection was made and the delivery attempted;
1908 fd is set in the conn context, tls_out set up.
1909 DEFER - the connection could not be made, or something failed
1910 while setting up the SMTP session, or there was a
1911 non-message-specific error, such as a timeout.
1912 ERROR - helo_data or add_headers or authenticated_sender is
1913 specified for this transport, and the string failed
1917 smtp_setup_conn(smtp_context * sx, BOOL suppress_tls)
1919 #if defined(SUPPORT_TLS) && defined(SUPPORT_DANE)
1920 dns_answer tlsa_dnsa;
1922 smtp_transport_options_block * ob = sx->conn_args.tblock->options_block;
1923 BOOL pass_message = FALSE;
1924 uschar * message = NULL;
1928 sx->conn_args.ob = ob;
1930 sx->lmtp = strcmpic(ob->protocol, US"lmtp") == 0;
1931 sx->smtps = strcmpic(ob->protocol, US"smtps") == 0;
1933 sx->send_rset = TRUE;
1934 sx->send_quit = TRUE;
1935 sx->setting_up = TRUE;
1937 sx->esmtp_sent = FALSE;
1939 sx->utf8_needed = FALSE;
1941 sx->dsn_all_lasthop = TRUE;
1942 #if defined(SUPPORT_TLS) && defined(SUPPORT_DANE)
1945 verify_check_given_host(CUSS &ob->hosts_require_dane, sx->conn_args.host) == OK;
1947 #ifdef EXPERIMENTAL_PIPE_CONNECT
1948 sx->early_pipe_active = sx->early_pipe_ok = FALSE;
1949 sx->ehlo_resp.cleartext_features = sx->ehlo_resp.crypted_features = 0;
1950 sx->pending_BANNER = sx->pending_EHLO = FALSE;
1953 if ((sx->max_rcpt = sx->conn_args.tblock->max_addresses) == 0) sx->max_rcpt = 999999;
1954 sx->peer_offered = 0;
1955 sx->avoid_option = 0;
1956 sx->igquotstr = US"";
1957 if (!sx->helo_data) sx->helo_data = ob->helo_data;
1958 #ifdef EXPERIMENTAL_DSN_INFO
1959 sx->smtp_greeting = NULL;
1960 sx->helo_response = NULL;
1963 smtp_command = US"initial connection";
1964 sx->buffer[0] = '\0';
1966 /* Set up the buffer for reading SMTP response packets. */
1968 sx->inblock.buffer = sx->inbuffer;
1969 sx->inblock.buffersize = sizeof(sx->inbuffer);
1970 sx->inblock.ptr = sx->inbuffer;
1971 sx->inblock.ptrend = sx->inbuffer;
1973 /* Set up the buffer for holding SMTP commands while pipelining */
1975 sx->outblock.buffer = sx->outbuffer;
1976 sx->outblock.buffersize = sizeof(sx->outbuffer);
1977 sx->outblock.ptr = sx->outbuffer;
1978 sx->outblock.cmd_count = 0;
1979 sx->outblock.authenticating = FALSE;
1980 sx->outblock.conn_args = NULL;
1982 /* Reset the parameters of a TLS session. */
1985 tls_out.cipher = NULL; /* the one we may use for this transport */
1986 tls_out.ourcert = NULL;
1987 tls_out.peercert = NULL;
1988 tls_out.peerdn = NULL;
1989 #if defined(SUPPORT_TLS) && !defined(USE_GNUTLS)
1992 tls_out.ocsp = OCSP_NOT_REQ;
1994 /* Flip the legacy TLS-related variables over to the outbound set in case
1995 they're used in the context of the transport. Don't bother resetting
1996 afterward (when being used by a transport) as we're in a subprocess.
1997 For verify, unflipped once the callout is dealt with */
1999 tls_modify_variables(&tls_out);
2004 set_errno_nohost(sx->addrlist, ERRNO_TLSFAILURE, US"TLS support not available",
2010 /* Make a connection to the host if this isn't a continued delivery, and handle
2011 the initial interaction and HELO/EHLO/LHLO. Connect timeout errors are handled
2012 specially so they can be identified for retries. */
2014 if (!continue_hostname)
2017 HDEBUG(D_verify) debug_printf("interface=%s port=%d\n", sx->conn_args.interface, sx->port);
2019 /* Get the actual port the connection will use, into sx->conn_args.host */
2021 smtp_port_for_connect(sx->conn_args.host, sx->port);
2023 #if defined(SUPPORT_TLS) && defined(SUPPORT_DANE)
2024 /* Do TLSA lookup for DANE */
2026 tls_out.dane_verified = FALSE;
2027 tls_out.tlsa_usage = 0;
2029 if (sx->conn_args.host->dnssec == DS_YES)
2031 if( sx->dane_required
2032 || verify_check_given_host(CUSS &ob->hosts_try_dane, sx->conn_args.host) == OK
2034 switch (rc = tlsa_lookup(sx->conn_args.host, &tlsa_dnsa, sx->dane_required))
2036 case OK: sx->dane = TRUE;
2037 ob->tls_tempfail_tryclear = FALSE;
2039 case FAIL_FORCED: break;
2040 default: set_errno_nohost(sx->addrlist, ERRNO_DNSDEFER,
2041 string_sprintf("DANE error: tlsa lookup %s",
2042 rc == DEFER ? "DEFER" : "FAIL"),
2044 # ifndef DISABLE_EVENT
2045 (void) event_raise(sx->conn_args.tblock->event_action,
2046 US"dane:fail", sx->dane_required
2047 ? US"dane-required" : US"dnssec-invalid");
2052 else if (sx->dane_required)
2054 set_errno_nohost(sx->addrlist, ERRNO_DNSDEFER,
2055 string_sprintf("DANE error: %s lookup not DNSSEC", sx->conn_args.host->name),
2057 # ifndef DISABLE_EVENT
2058 (void) event_raise(sx->conn_args.tblock->event_action,
2059 US"dane:fail", US"dane-required");
2066 /* Make the TCP connection */
2068 sx->cctx.tls_ctx = NULL;
2069 sx->inblock.cctx = sx->outblock.cctx = &sx->cctx;
2070 sx->avoid_option = sx->peer_offered = smtp_peer_options = 0;
2072 #ifdef EXPERIMENTAL_PIPE_CONNECT
2073 if (verify_check_given_host(CUSS &ob->hosts_pipe_connect, sx->conn_args.host) == OK)
2075 sx->early_pipe_ok = TRUE;
2076 if ( read_ehlo_cache_entry(sx)
2077 && sx->ehlo_resp.cleartext_features & OPTION_EARLY_PIPE)
2079 DEBUG(D_transport) debug_printf("Using cached cleartext PIPE_CONNECT\n");
2080 sx->early_pipe_active = TRUE;
2081 sx->peer_offered = sx->ehlo_resp.cleartext_features;
2085 if (sx->early_pipe_active)
2086 sx->outblock.conn_args = &sx->conn_args;
2090 if ((sx->cctx.sock = smtp_connect(&sx->conn_args, NULL)) < 0)
2092 uschar * msg = NULL;
2095 msg = US strerror(errno);
2096 HDEBUG(D_verify) debug_printf("connect: %s\n", msg);
2098 set_errno_nohost(sx->addrlist,
2099 errno == ETIMEDOUT ? ERRNO_CONNECTTIMEOUT : errno,
2100 sx->verify ? string_sprintf("could not connect: %s", msg)
2103 sx->send_quit = FALSE;
2107 /* Expand the greeting message while waiting for the initial response. (Makes
2108 sense if helo_data contains ${lookup dnsdb ...} stuff). The expansion is
2109 delayed till here so that $sending_interface and $sending_port are set. */
2110 /*XXX early-pipe: they still will not be. Is there any way to find out what they
2111 will be? Somehow I doubt it. */
2114 if (!(sx->helo_data = expand_string(sx->helo_data)))
2116 log_write(0, LOG_MAIN|LOG_PANIC,
2117 "<%s>: failed to expand transport's helo_data value for callout: %s",
2118 sx->addrlist->address, expand_string_message);
2123 expand_string_message = NULL;
2124 if ((sx->helo_data = string_domain_utf8_to_alabel(sx->helo_data,
2125 &expand_string_message)),
2126 expand_string_message)
2128 log_write(0, LOG_MAIN|LOG_PANIC,
2129 "<%s>: failed to expand transport's helo_data value for callout: %s",
2130 sx->addrlist->address, expand_string_message);
2132 sx->helo_data = NULL;
2136 /* The first thing is to wait for an initial OK response. The dreaded "goto"
2137 is nevertheless a reasonably clean way of programming this kind of logic,
2138 where you want to escape on any error. */
2142 #ifdef EXPERIMENTAL_PIPE_CONNECT
2143 if (sx->early_pipe_active)
2145 sx->pending_BANNER = TRUE; /* sync_responses() must eventually handle */
2146 sx->outblock.cmd_count = 1;
2152 (void) setsockopt(sx->cctx.sock, IPPROTO_TCP, TCP_QUICKACK, US &off,
2155 if (!smtp_reap_banner(sx))
2156 goto RESPONSE_FAILED;
2159 #ifndef DISABLE_EVENT
2162 lookup_dnssec_authenticated = sx->conn_args.host->dnssec==DS_YES ? US"yes"
2163 : sx->conn_args.host->dnssec==DS_NO ? US"no" : NULL;
2164 s = event_raise(sx->conn_args.tblock->event_action, US"smtp:connect", sx->buffer);
2167 set_errno_nohost(sx->addrlist, ERRNO_EXPANDFAIL,
2168 string_sprintf("deferred by smtp:connect event expansion: %s", s),
2176 /* Now check if the helo_data expansion went well, and sign off cleanly if
2181 message = string_sprintf("failed to expand helo_data: %s",
2182 expand_string_message);
2183 set_errno_nohost(sx->addrlist, ERRNO_EXPANDFAIL, message, DEFER, FALSE);
2189 /** Debugging without sending a message
2190 sx->addrlist->transport_return = DEFER;
2194 /* Errors that occur after this point follow an SMTP command, which is
2195 left in big_buffer by smtp_write_command() for use in error messages. */
2197 smtp_command = big_buffer;
2199 /* Tell the remote who we are...
2201 February 1998: A convention has evolved that ESMTP-speaking MTAs include the
2202 string "ESMTP" in their greeting lines, so make Exim send EHLO if the
2203 greeting is of this form. The assumption was that the far end supports it
2204 properly... but experience shows that there are some that give 5xx responses,
2205 even though the banner includes "ESMTP" (there's a bloody-minded one that
2206 says "ESMTP not spoken here"). Cope with that case.
2208 September 2000: Time has passed, and it seems reasonable now to always send
2209 EHLO at the start. It is also convenient to make the change while installing
2212 July 2003: Joachim Wieland met a broken server that advertises "PIPELINING"
2213 but times out after sending MAIL FROM, RCPT TO and DATA all together. There
2214 would be no way to send out the mails, so there is now a host list
2215 "hosts_avoid_esmtp" that disables ESMTP for special hosts and solves the
2216 PIPELINING problem as well. Maybe it can also be useful to cure other
2217 problems with broken servers.
2219 Exim originally sent "Helo" at this point and ran for nearly a year that way.
2220 Then somebody tried it with a Microsoft mailer... It seems that all other
2221 mailers use upper case for some reason (the RFC is quite clear about case
2222 independence) so, for peace of mind, I gave in. */
2224 sx->esmtp = verify_check_given_host(CUSS &ob->hosts_avoid_esmtp, sx->conn_args.host) != OK;
2226 /* Alas; be careful, since this goto is not an error-out, so conceivably
2227 we might set data between here and the target which we assume to exist
2228 and be usable. I can see this coming back to bite us. */
2232 smtp_peer_options |= OPTION_TLS;
2233 suppress_tls = FALSE;
2234 ob->tls_tempfail_tryclear = FALSE;
2235 smtp_command = US"SSL-on-connect";
2242 if (smtp_write_command(sx,
2243 #ifdef EXPERIMENTAL_PIPE_CONNECT
2244 sx->early_pipe_active ? SCMD_BUFFER :
2247 "%s %s\r\n", sx->lmtp ? "LHLO" : "EHLO", sx->helo_data) < 0)
2249 sx->esmtp_sent = TRUE;
2251 #ifdef EXPERIMENTAL_PIPE_CONNECT
2252 if (sx->early_pipe_active)
2254 sx->pending_EHLO = TRUE;
2256 /* If we have too many authenticators to handle and might need to AUTH
2257 for this transport, pipeline no further as we will need the
2258 list of auth methods offered. Reap the banner and EHLO. */
2260 if ( (ob->hosts_require_auth || ob->hosts_try_auth)
2261 && f.smtp_in_early_pipe_no_auth)
2263 DEBUG(D_transport) debug_printf("may need to auth, so pipeline no further\n");
2264 if (smtp_write_command(sx, SCMD_FLUSH, NULL) < 0)
2266 if (sync_responses(sx, 2, 0) != 0)
2269 debug_printf("failed reaping pipelined cmd responses\n");
2270 goto RESPONSE_FAILED;
2272 sx->early_pipe_active = FALSE;
2277 if (!smtp_reap_ehlo(sx))
2278 goto RESPONSE_FAILED;
2282 debug_printf("not sending EHLO (host matches hosts_avoid_esmtp)\n");
2284 #ifdef EXPERIMENTAL_PIPE_CONNECT
2285 if (!sx->early_pipe_active)
2290 int n = sizeof(sx->buffer);
2291 uschar * rsp = sx->buffer;
2293 if (sx->esmtp_sent && (n = Ustrlen(sx->buffer)) < sizeof(sx->buffer)/2)
2294 { rsp = sx->buffer + n + 1; n = sizeof(sx->buffer) - n; }
2296 if (smtp_write_command(sx, SCMD_FLUSH, "HELO %s\r\n", sx->helo_data) < 0)
2298 good_response = smtp_read_response(sx, rsp, n, '2', ob->command_timeout);
2299 #ifdef EXPERIMENTAL_DSN_INFO
2300 sx->helo_response = string_copy(rsp);
2304 /* Handle special logging for a closed connection after HELO
2305 when had previously sent EHLO */
2307 if (rsp != sx->buffer && rsp[0] == 0 && (errno == 0 || errno == ECONNRESET))
2309 errno = ERRNO_SMTPCLOSED;
2310 goto EHLOHELO_FAILED;
2312 memmove(sx->buffer, rsp, Ustrlen(rsp));
2313 goto RESPONSE_FAILED;
2317 if (sx->esmtp || sx->lmtp)
2319 #ifdef EXPERIMENTAL_PIPE_CONNECT
2320 if (!sx->early_pipe_active)
2323 sx->peer_offered = ehlo_response(sx->buffer,
2324 OPTION_TLS /* others checked later */
2325 #ifdef EXPERIMENTAL_PIPE_CONNECT
2326 | (sx->early_pipe_ok
2328 | OPTION_CHUNKING | OPTION_PRDR | OPTION_DSN | OPTION_PIPE | OPTION_SIZE
2337 #ifdef EXPERIMENTAL_PIPE_CONNECT
2338 if (sx->early_pipe_ok)
2340 sx->ehlo_resp.cleartext_features = sx->peer_offered;
2342 if ( (sx->peer_offered & (OPTION_PIPE | OPTION_EARLY_PIPE))
2343 == (OPTION_PIPE | OPTION_EARLY_PIPE))
2345 DEBUG(D_transport) debug_printf("PIPE_CONNECT usable in future for this IP\n");
2346 sx->ehlo_resp.cleartext_auths = study_ehlo_auths(sx);
2347 write_ehlo_cache_entry(sx);
2353 /* Set tls_offered if the response to EHLO specifies support for STARTTLS. */
2356 smtp_peer_options |= sx->peer_offered & OPTION_TLS;
2361 /* For continuing deliveries down the same channel, having re-exec'd the socket
2362 is the standard input; for a socket held open from verify it is recorded
2363 in the cutthrough context block. Either way we don't need to redo EHLO here
2364 (but may need to do so for TLS - see below).
2365 Set up the pointer to where subsequent commands will be left, for
2366 error messages. Note that smtp_peer_options will have been
2367 set from the command line if they were set in the process that passed the
2370 /*XXX continue case needs to propagate DSN_INFO, prob. in deliver.c
2371 as the continue goes via transport_pass_socket() and doublefork and exec.
2372 It does not wait. Unclear how we keep separate host's responses
2373 separate - we could match up by host ip+port as a bodge. */
2377 if (cutthrough.cctx.sock >= 0 && cutthrough.callout_hold_only)
2379 sx->cctx = cutthrough.cctx;
2380 sx->conn_args.host->port = sx->port = cutthrough.host.port;
2384 sx->cctx.sock = 0; /* stdin */
2385 sx->cctx.tls_ctx = NULL;
2386 smtp_port_for_connect(sx->conn_args.host, sx->port); /* Record the port that was used */
2388 sx->inblock.cctx = sx->outblock.cctx = &sx->cctx;
2389 smtp_command = big_buffer;
2390 sx->helo_data = NULL; /* ensure we re-expand ob->helo_data */
2392 /* For a continued connection with TLS being proxied for us, or a
2393 held-open verify connection with TLS, nothing more to do. */
2395 if ( continue_proxy_cipher
2396 || (cutthrough.cctx.sock >= 0 && cutthrough.callout_hold_only
2397 && cutthrough.is_tls)
2400 sx->peer_offered = smtp_peer_options;
2401 sx->pipelining_used = pipelining_active = !!(smtp_peer_options & OPTION_PIPE);
2402 HDEBUG(D_transport) debug_printf("continued connection, %s TLS\n",
2403 continue_proxy_cipher ? "proxied" : "verify conn with");
2406 HDEBUG(D_transport) debug_printf("continued connection, no TLS\n");
2409 /* If TLS is available on this connection, whether continued or not, attempt to
2410 start up a TLS session, unless the host is in hosts_avoid_tls. If successful,
2411 send another EHLO - the server may give a different answer in secure mode. We
2412 use a separate buffer for reading the response to STARTTLS so that if it is
2413 negative, the original EHLO data is available for subsequent analysis, should
2414 the client not be required to use TLS. If the response is bad, copy the buffer
2415 for error analysis. */
2418 if ( smtp_peer_options & OPTION_TLS
2420 && verify_check_given_host(CUSS &ob->hosts_avoid_tls, sx->conn_args.host) != OK
2422 || verify_check_given_host(CUSS &ob->hosts_verify_avoid_tls, sx->conn_args.host) != OK
2425 uschar buffer2[4096];
2427 if (smtp_write_command(sx, SCMD_FLUSH, "STARTTLS\r\n") < 0)
2430 #ifdef EXPERIMENTAL_PIPE_CONNECT
2431 /* If doing early-pipelining reap the banner and EHLO-response but leave
2432 the response for the STARTTLS we just sent alone. */
2434 if (sx->early_pipe_active && sync_responses(sx, 2, 0) != 0)
2437 debug_printf("failed reaping pipelined cmd responses\n");
2438 goto RESPONSE_FAILED;
2442 /* If there is an I/O error, transmission of this message is deferred. If
2443 there is a temporary rejection of STARRTLS and tls_tempfail_tryclear is
2444 false, we also defer. However, if there is a temporary rejection of STARTTLS
2445 and tls_tempfail_tryclear is true, or if there is an outright rejection of
2446 STARTTLS, we carry on. This means we will try to send the message in clear,
2447 unless the host is in hosts_require_tls (tested below). */
2449 if (!smtp_read_response(sx, buffer2, sizeof(buffer2), '2', ob->command_timeout))
2453 || (buffer2[0] == '4' && !ob->tls_tempfail_tryclear)
2456 Ustrncpy(sx->buffer, buffer2, sizeof(sx->buffer));
2457 sx->buffer[sizeof(sx->buffer)-1] = '\0';
2458 goto RESPONSE_FAILED;
2462 /* STARTTLS accepted: try to negotiate a TLS session. */
2467 address_item * addr;
2469 sx->cctx.tls_ctx = tls_client_start(sx->cctx.sock, sx->conn_args.host,
2470 sx->addrlist, sx->conn_args.tblock,
2471 # ifdef SUPPORT_DANE
2472 sx->dane ? &tlsa_dnsa : NULL,
2476 if (!sx->cctx.tls_ctx)
2478 /* TLS negotiation failed; give an error. From outside, this function may
2479 be called again to try in clear on a new connection, if the options permit
2480 it for this host. */
2481 DEBUG(D_tls) debug_printf("TLS session fail: %s\n", errstr);
2483 # ifdef SUPPORT_DANE
2486 log_write(0, LOG_MAIN,
2487 "DANE attempt failed; TLS connection to %s [%s]: %s",
2488 sx->conn_args.host->name, sx->conn_args.host->address, errstr);
2489 # ifndef DISABLE_EVENT
2490 (void) event_raise(sx->conn_args.tblock->event_action,
2491 US"dane:fail", US"validation-failure"); /* could do with better detail */
2496 errno = ERRNO_TLSFAILURE;
2497 message = string_sprintf("TLS session: %s", errstr);
2498 sx->send_quit = FALSE;
2502 /* TLS session is set up */
2504 smtp_peer_options_wrap = smtp_peer_options;
2505 for (address_item * addr = sx->addrlist; addr; addr = addr->next)
2506 if (addr->transport_return == PENDING_DEFER)
2508 addr->cipher = tls_out.cipher;
2509 addr->ourcert = tls_out.ourcert;
2510 addr->peercert = tls_out.peercert;
2511 addr->peerdn = tls_out.peerdn;
2512 addr->ocsp = tls_out.ocsp;
2517 /* if smtps, we'll have smtp_command set to something else; always safe to
2519 smtp_command = big_buffer;
2521 /* If we started TLS, redo the EHLO/LHLO exchange over the secure channel. If
2522 helo_data is null, we are dealing with a connection that was passed from
2523 another process, and so we won't have expanded helo_data above. We have to
2524 expand it here. $sending_ip_address and $sending_port are set up right at the
2525 start of the Exim process (in exim.c). */
2527 if (tls_out.active.sock >= 0)
2529 uschar * greeting_cmd;
2531 if (!sx->helo_data && !(sx->helo_data = expand_string(ob->helo_data)))
2533 uschar *message = string_sprintf("failed to expand helo_data: %s",
2534 expand_string_message);
2535 set_errno_nohost(sx->addrlist, ERRNO_EXPANDFAIL, message, DEFER, FALSE);
2540 #ifdef EXPERIMENTAL_PIPE_CONNECT
2541 /* For SMTPS there is no cleartext early-pipe; use the crypted permission bit.
2542 We're unlikely to get the group sent and delivered before the server sends its
2543 banner, but it's still worth sending as a group.
2544 For STARTTLS allow for cleartext early-pipe but no crypted early-pipe, but not
2547 if (sx->smtps ? sx->early_pipe_ok : sx->early_pipe_active)
2549 sx->peer_offered = sx->ehlo_resp.crypted_features;
2550 if ((sx->early_pipe_active =
2551 !!(sx->ehlo_resp.crypted_features & OPTION_EARLY_PIPE)))
2552 DEBUG(D_transport) debug_printf("Using cached crypted PIPE_CONNECT\n");
2556 /* For SMTPS we need to wait for the initial OK response. */
2558 #ifdef EXPERIMENTAL_PIPE_CONNECT
2559 if (sx->early_pipe_active)
2561 sx->pending_BANNER = TRUE;
2562 sx->outblock.cmd_count = 1;
2566 if (!smtp_reap_banner(sx))
2567 goto RESPONSE_FAILED;
2570 greeting_cmd = US"LHLO";
2572 greeting_cmd = US"EHLO";
2575 greeting_cmd = US"HELO";
2577 debug_printf("not sending EHLO (host matches hosts_avoid_esmtp)\n");
2580 if (smtp_write_command(sx,
2581 #ifdef EXPERIMENTAL_PIPE_CONNECT
2582 sx->early_pipe_active ? SCMD_BUFFER :
2585 "%s %s\r\n", greeting_cmd, sx->helo_data) < 0)
2588 #ifdef EXPERIMENTAL_PIPE_CONNECT
2589 if (sx->early_pipe_active)
2590 sx->pending_EHLO = TRUE;
2594 if (!smtp_reap_ehlo(sx))
2595 goto RESPONSE_FAILED;
2596 smtp_peer_options = 0;
2600 /* If the host is required to use a secure channel, ensure that we
2604 # ifdef SUPPORT_DANE
2607 # ifdef EXPERIMENTAL_REQUIRETLS
2608 || tls_requiretls & REQUIRETLS_MSG
2610 || verify_check_given_host(CUSS &ob->hosts_require_tls, sx->conn_args.host) == OK
2614 # ifdef EXPERIMENTAL_REQUIRETLS
2615 tls_requiretls & REQUIRETLS_MSG ? ERRNO_REQUIRETLS :
2618 message = string_sprintf("a TLS session is required, but %s",
2619 smtp_peer_options & OPTION_TLS
2620 ? "an attempt to start TLS failed" : "the server did not offer TLS support");
2621 # if defined(SUPPORT_DANE) && !defined(DISABLE_EVENT)
2623 (void) event_raise(sx->conn_args.tblock->event_action, US"dane:fail",
2624 smtp_peer_options & OPTION_TLS
2625 ? US"validation-failure" /* could do with better detail */
2626 : US"starttls-not-supported");
2630 #endif /*SUPPORT_TLS*/
2632 /* If TLS is active, we have just started it up and re-done the EHLO command,
2633 so its response needs to be analyzed. If TLS is not active and this is a
2634 continued session down a previously-used socket, we haven't just done EHLO, so
2637 if (continue_hostname == NULL
2639 || tls_out.active.sock >= 0
2643 if (sx->esmtp || sx->lmtp)
2645 #ifdef EXPERIMENTAL_PIPE_CONNECT
2646 if (!sx->early_pipe_active)
2649 sx->peer_offered = ehlo_response(sx->buffer,
2651 #ifdef EXPERIMENTAL_PIPE_CONNECT
2652 | (sx->lmtp && ob->lmtp_ignore_quota ? OPTION_IGNQ : 0)
2653 | OPTION_DSN | OPTION_PIPE | OPTION_SIZE
2654 | OPTION_CHUNKING | OPTION_PRDR | OPTION_UTF8 | OPTION_REQUIRETLS
2655 | (tls_out.active.sock >= 0 ? OPTION_EARLY_PIPE : 0) /* not for lmtp */
2659 | (sx->lmtp && ob->lmtp_ignore_quota ? OPTION_IGNQ : 0)
2662 # ifdef SUPPORT_I18N
2663 | (sx->addrlist->prop.utf8_msg ? OPTION_UTF8 : 0)
2664 /*XXX if we hand peercaps on to continued-conn processes,
2665 must not depend on this addr */
2669 | (ob->size_addition >= 0 ? OPTION_SIZE : 0)
2670 # if defined(SUPPORT_TLS) && defined(EXPERIMENTAL_REQUIRETLS)
2671 | (tls_requiretls & REQUIRETLS_MSG ? OPTION_REQUIRETLS : 0)
2675 #ifdef EXPERIMENTAL_PIPE_CONNECT
2676 if (tls_out.active.sock >= 0)
2677 sx->ehlo_resp.crypted_features = sx->peer_offered;
2681 /* Set for IGNOREQUOTA if the response to LHLO specifies support and the
2682 lmtp_ignore_quota option was set. */
2684 sx->igquotstr = sx->peer_offered & OPTION_IGNQ ? US" IGNOREQUOTA" : US"";
2686 /* If the response to EHLO specified support for the SIZE parameter, note
2687 this, provided size_addition is non-negative. */
2689 smtp_peer_options |= sx->peer_offered & OPTION_SIZE;
2691 /* Note whether the server supports PIPELINING. If hosts_avoid_esmtp matched
2692 the current host, esmtp will be false, so PIPELINING can never be used. If
2693 the current host matches hosts_avoid_pipelining, don't do it. */
2695 if ( sx->peer_offered & OPTION_PIPE
2696 && verify_check_given_host(CUSS &ob->hosts_avoid_pipelining, sx->conn_args.host) != OK)
2697 smtp_peer_options |= OPTION_PIPE;
2699 DEBUG(D_transport) debug_printf("%susing PIPELINING\n",
2700 smtp_peer_options & OPTION_PIPE ? "" : "not ");
2702 if ( sx->peer_offered & OPTION_CHUNKING
2703 && verify_check_given_host(CUSS &ob->hosts_try_chunking, sx->conn_args.host) != OK)
2704 sx->peer_offered &= ~OPTION_CHUNKING;
2706 if (sx->peer_offered & OPTION_CHUNKING)
2707 DEBUG(D_transport) debug_printf("CHUNKING usable\n");
2709 #ifndef DISABLE_PRDR
2710 if ( sx->peer_offered & OPTION_PRDR
2711 && verify_check_given_host(CUSS &ob->hosts_try_prdr, sx->conn_args.host) != OK)
2712 sx->peer_offered &= ~OPTION_PRDR;
2714 if (sx->peer_offered & OPTION_PRDR)
2715 DEBUG(D_transport) debug_printf("PRDR usable\n");
2718 /* Note if the server supports DSN */
2719 smtp_peer_options |= sx->peer_offered & OPTION_DSN;
2720 DEBUG(D_transport) debug_printf("%susing DSN\n",
2721 sx->peer_offered & OPTION_DSN ? "" : "not ");
2723 #if defined(SUPPORT_TLS) && defined(EXPERIMENTAL_REQUIRETLS)
2724 if (sx->peer_offered & OPTION_REQUIRETLS)
2726 smtp_peer_options |= OPTION_REQUIRETLS;
2727 DEBUG(D_transport) debug_printf(
2728 tls_requiretls & REQUIRETLS_MSG
2729 ? "using REQUIRETLS\n" : "REQUIRETLS offered\n");
2733 #ifdef EXPERIMENTAL_PIPE_CONNECT
2734 if ( sx->early_pipe_ok
2735 && !sx->early_pipe_active
2736 && tls_out.active.sock >= 0
2737 && smtp_peer_options & OPTION_PIPE
2738 && ( sx->ehlo_resp.cleartext_features | sx->ehlo_resp.crypted_features)
2739 & OPTION_EARLY_PIPE)
2741 DEBUG(D_transport) debug_printf("PIPE_CONNECT usable in future for this IP\n");
2742 sx->ehlo_resp.crypted_auths = study_ehlo_auths(sx);
2743 write_ehlo_cache_entry(sx);
2747 /* Note if the response to EHLO specifies support for the AUTH extension.
2748 If it has, check that this host is one we want to authenticate to, and do
2749 the business. The host name and address must be available when the
2750 authenticator's client driver is running. */
2752 switch (yield = smtp_auth(sx))
2754 default: goto SEND_QUIT;
2756 case FAIL_SEND: goto SEND_FAILED;
2757 case FAIL: goto RESPONSE_FAILED;
2761 sx->pipelining_used = pipelining_active = !!(smtp_peer_options & OPTION_PIPE);
2763 /* The setting up of the SMTP call is now complete. Any subsequent errors are
2764 message-specific. */
2766 sx->setting_up = FALSE;
2769 if (sx->addrlist->prop.utf8_msg)
2773 /* If the transport sets a downconversion mode it overrides any set by ACL
2776 if ((s = ob->utf8_downconvert))
2778 if (!(s = expand_string(s)))
2780 message = string_sprintf("failed to expand utf8_downconvert: %s",
2781 expand_string_message);
2782 set_errno_nohost(sx->addrlist, ERRNO_EXPANDFAIL, message, DEFER, FALSE);
2788 case '1': sx->addrlist->prop.utf8_downcvt = TRUE;
2789 sx->addrlist->prop.utf8_downcvt_maybe = FALSE;
2791 case '0': sx->addrlist->prop.utf8_downcvt = FALSE;
2792 sx->addrlist->prop.utf8_downcvt_maybe = FALSE;
2794 case '-': if (s[1] == '1')
2796 sx->addrlist->prop.utf8_downcvt = FALSE;
2797 sx->addrlist->prop.utf8_downcvt_maybe = TRUE;
2803 sx->utf8_needed = !sx->addrlist->prop.utf8_downcvt
2804 && !sx->addrlist->prop.utf8_downcvt_maybe;
2805 DEBUG(D_transport) if (!sx->utf8_needed)
2806 debug_printf("utf8: %s downconvert\n",
2807 sx->addrlist->prop.utf8_downcvt ? "mandatory" : "optional");
2810 /* If this is an international message we need the host to speak SMTPUTF8 */
2811 if (sx->utf8_needed && !(sx->peer_offered & OPTION_UTF8))
2813 errno = ERRNO_UTF8_FWD;
2814 goto RESPONSE_FAILED;
2816 #endif /*SUPPORT_I18N*/
2818 #if defined(SUPPORT_TLS) && defined(EXPERIMENTAL_REQUIRETLS)
2819 /*XXX should tls_requiretls actually be per-addr? */
2821 if ( tls_requiretls & REQUIRETLS_MSG
2822 && !(sx->peer_offered & OPTION_REQUIRETLS)
2825 sx->setting_up = TRUE;
2826 errno = ERRNO_REQUIRETLS;
2827 message = US"REQUIRETLS support is required from the server"
2828 " but it was not offered";
2829 DEBUG(D_transport) debug_printf("%s\n", message);
2842 sx->send_quit = check_response(sx->conn_args.host, &errno, sx->addrlist->more_errno,
2843 sx->buffer, &code, &message, &pass_message);
2849 message = US string_sprintf("send() to %s [%s] failed: %s",
2850 sx->conn_args.host->name, sx->conn_args.host->address, strerror(errno));
2851 sx->send_quit = FALSE;
2857 message = string_sprintf("Remote host closed connection in response to %s"
2858 " (EHLO response was: %s)", smtp_command, sx->buffer);
2859 sx->send_quit = FALSE;
2863 /* This label is jumped to directly when a TLS negotiation has failed,
2864 or was not done for a host for which it is required. Values will be set
2865 in message and errno, and setting_up will always be true. Treat as
2866 a temporary error. */
2870 # ifdef EXPERIMENTAL_REQUIRETLS
2871 if (errno == ERRNO_REQUIRETLS)
2872 code = '5', yield = FAIL;
2873 /*XXX DSN will be labelled 500; prefer 530 5.7.4 */
2876 code = '4', yield = DEFER;
2880 /* The failure happened while setting up the call; see if the failure was
2881 a 5xx response (this will either be on connection, or following HELO - a 5xx
2882 after EHLO causes it to try HELO). If so, and there are no more hosts to try,
2883 fail all addresses, as this host is never going to accept them. For other
2884 errors during setting up (timeouts or whatever), defer all addresses, and
2885 yield DEFER, so that the host is not tried again for a while.
2887 XXX This peeking for another host feels like a layering violation. We want
2888 to note the host as unusable, but down here we shouldn't know if this was
2889 the last host to try for the addr(list). Perhaps the upper layer should be
2890 the one to do set_errno() ? The problem is that currently the addr is where
2891 errno etc. are stashed, but until we run out of hosts to try the errors are
2892 host-specific. Maybe we should enhance the host_item definition? */
2895 sx->ok = FALSE; /* For when reached by GOTO */
2896 set_errno(sx->addrlist, errno, message,
2897 sx->conn_args.host->next
2901 || errno == ERRNO_UTF8_FWD
2904 pass_message, sx->conn_args.host
2905 #ifdef EXPERIMENTAL_DSN_INFO
2906 , sx->smtp_greeting, sx->helo_response
2915 (void)smtp_write_command(sx, SCMD_FLUSH, "QUIT\r\n");
2918 if (sx->cctx.tls_ctx)
2920 tls_close(sx->cctx.tls_ctx, TLS_SHUTDOWN_NOWAIT);
2921 sx->cctx.tls_ctx = NULL;
2925 /* Close the socket, and return the appropriate value, first setting
2926 works because the NULL setting is passed back to the calling process, and
2927 remote_max_parallel is forced to 1 when delivering over an existing connection,
2930 HDEBUG(D_transport|D_acl|D_v) debug_printf_indent(" SMTP(close)>>\n");
2933 shutdown(sx->cctx.sock, SHUT_WR);
2934 if (fcntl(sx->cctx.sock, F_SETFL, O_NONBLOCK) == 0)
2935 for (int i = 16; read(sx->cctx.sock, sx->inbuffer, sizeof(sx->inbuffer)) > 0 && i > 0;)
2936 i--; /* drain socket */
2937 sx->send_quit = FALSE;
2939 (void)close(sx->cctx.sock);
2942 #ifndef DISABLE_EVENT
2943 (void) event_raise(sx->conn_args.tblock->event_action, US"tcp:close", NULL);
2946 continue_transport = NULL;
2947 continue_hostname = NULL;
2954 /* Create the string of options that will be appended to the MAIL FROM:
2955 in the connection context buffer */
2958 build_mailcmd_options(smtp_context * sx, address_item * addrlist)
2960 uschar * p = sx->buffer;
2961 address_item * addr;
2966 /* If we know the receiving MTA supports the SIZE qualification, and we know it,
2967 send it, adding something to the message size to allow for imprecision
2968 and things that get added en route. Exim keeps the number of lines
2969 in a message, so we can give an accurate value for the original message, but we
2970 need some additional to handle added headers. (Double "." characters don't get
2971 included in the count.) */
2973 if ( message_size > 0
2974 && sx->peer_offered & OPTION_SIZE && !(sx->avoid_option & OPTION_SIZE))
2976 /*XXX problem here under spool_files_wireformat?
2977 Or just forget about lines? Or inflate by a fixed proportion? */
2979 sprintf(CS p, " SIZE=%d", message_size+message_linecount+(SOB sx->conn_args.ob)->size_addition);
2983 #ifndef DISABLE_PRDR
2984 /* If it supports Per-Recipient Data Reponses, and we have omre than one recipient,
2987 sx->prdr_active = FALSE;
2988 if (sx->peer_offered & OPTION_PRDR)
2989 for (address_item * addr = addrlist; addr; addr = addr->next)
2990 if (addr->transport_return == PENDING_DEFER)
2992 for (addr = addr->next; addr; addr = addr->next)
2993 if (addr->transport_return == PENDING_DEFER)
2994 { /* at least two recipients to send */
2995 sx->prdr_active = TRUE;
2996 sprintf(CS p, " PRDR"); p += 5;
3004 /* If it supports internationalised messages, and this meesage need that,
3007 if ( sx->peer_offered & OPTION_UTF8
3008 && addrlist->prop.utf8_msg
3009 && !addrlist->prop.utf8_downcvt
3011 Ustrcpy(p, " SMTPUTF8"), p += 9;
3014 #if defined(SUPPORT_TLS) && defined(EXPERIMENTAL_REQUIRETLS)
3015 if (tls_requiretls & REQUIRETLS_MSG)
3016 Ustrcpy(p, " REQUIRETLS") , p += 11;
3019 /* check if all addresses have DSN-lasthop flag; do not send RET and ENVID if so */
3020 for (sx->dsn_all_lasthop = TRUE, addr = addrlist, address_count = 0;
3021 addr && address_count < sx->max_rcpt;
3022 addr = addr->next) if (addr->transport_return == PENDING_DEFER)
3025 if (!(addr->dsn_flags & rf_dsnlasthop))
3027 sx->dsn_all_lasthop = FALSE;
3032 /* Add any DSN flags to the mail command */
3034 if (sx->peer_offered & OPTION_DSN && !sx->dsn_all_lasthop)
3036 if (dsn_ret == dsn_ret_hdrs)
3037 { Ustrcpy(p, " RET=HDRS"); p += 9; }
3038 else if (dsn_ret == dsn_ret_full)
3039 { Ustrcpy(p, " RET=FULL"); p += 9; }
3043 string_format(p, sizeof(sx->buffer) - (p-sx->buffer), " ENVID=%s", dsn_envid);
3048 /* If an authenticated_sender override has been specified for this transport
3049 instance, expand it. If the expansion is forced to fail, and there was already
3050 an authenticated_sender for this message, the original value will be used.
3051 Other expansion failures are serious. An empty result is ignored, but there is
3052 otherwise no check - this feature is expected to be used with LMTP and other
3053 cases where non-standard addresses (e.g. without domains) might be required. */
3055 if (smtp_mail_auth_str(p, sizeof(sx->buffer) - (p-sx->buffer), addrlist, sx->conn_args.ob))
3063 build_rcptcmd_options(smtp_context * sx, const address_item * addr)
3065 uschar * p = sx->buffer;
3068 /* Add any DSN flags to the rcpt command */
3070 if (sx->peer_offered & OPTION_DSN && !(addr->dsn_flags & rf_dsnlasthop))
3072 if (addr->dsn_flags & rf_dsnflags)
3076 Ustrcpy(p, " NOTIFY=");
3078 for (int i = 0; i < nelem(rf_list); i++) if (addr->dsn_flags & rf_list[i])
3080 if (!first) *p++ = ',';
3082 Ustrcpy(p, rf_names[i]);
3087 if (addr->dsn_orcpt)
3089 string_format(p, sizeof(sx->buffer) - (p-sx->buffer), " ORCPT=%s",
3100 0 good, rcpt results in addr->transport_return (PENDING_OK, DEFER, FAIL)
3101 -1 MAIL response error
3102 -2 any non-MAIL read i/o error
3103 -3 non-MAIL response timeout
3104 -4 internal error; channel still usable
3109 smtp_write_mail_and_rcpt_cmds(smtp_context * sx, int * yield)
3111 address_item * addr;
3115 if (build_mailcmd_options(sx, sx->first_addr) != OK)
3121 /* From here until we send the DATA command, we can make use of PIPELINING
3122 if the server host supports it. The code has to be able to check the responses
3123 at any point, for when the buffer fills up, so we write it totally generally.
3124 When PIPELINING is off, each command written reports that it has flushed the
3127 sx->pending_MAIL = TRUE; /* The block starts with MAIL */
3130 uschar * s = sx->from_addr;
3132 uschar * errstr = NULL;
3134 /* If we must downconvert, do the from-address here. Remember we had to
3135 for the to-addresses (done below), and also (ugly) for re-doing when building
3136 the delivery log line. */
3138 if ( sx->addrlist->prop.utf8_msg
3139 && (sx->addrlist->prop.utf8_downcvt || !(sx->peer_offered & OPTION_UTF8))
3142 if (s = string_address_utf8_to_alabel(s, &errstr), errstr)
3144 set_errno_nohost(sx->addrlist, ERRNO_EXPANDFAIL, errstr, DEFER, FALSE);
3148 setflag(sx->addrlist, af_utf8_downcvt);
3152 rc = smtp_write_command(sx, pipelining_active ? SCMD_BUFFER : SCMD_FLUSH,
3153 "MAIL FROM:<%s>%s\r\n", s, sx->buffer);
3156 mail_command = string_copy(big_buffer); /* Save for later error message */
3160 case -1: /* Transmission error */
3163 case +1: /* Cmd was sent */
3164 if (!smtp_read_response(sx, sx->buffer, sizeof(sx->buffer), '2',
3165 (SOB sx->conn_args.ob)->command_timeout))
3167 if (errno == 0 && sx->buffer[0] == '4')
3169 errno = ERRNO_MAIL4XX;
3170 sx->addrlist->more_errno |= ((sx->buffer[1] - '0')*10 + sx->buffer[2] - '0') << 8;
3174 sx->pending_MAIL = FALSE;
3177 /* otherwise zero: command queued for pipeline */
3180 /* Pass over all the relevant recipient addresses for this host, which are the
3181 ones that have status PENDING_DEFER. If we are using PIPELINING, we can send
3182 several before we have to read the responses for those seen so far. This
3183 checking is done by a subroutine because it also needs to be done at the end.
3184 Send only up to max_rcpt addresses at a time, leaving next_addr pointing to
3185 the next one if not all are sent.
3187 In the MUA wrapper situation, we want to flush the PIPELINING buffer for the
3188 last address because we want to abort if any recipients have any kind of
3189 problem, temporary or permanent. We know that all recipient addresses will have
3190 the PENDING_DEFER status, because only one attempt is ever made, and we know
3191 that max_rcpt will be large, so all addresses will be done at once.
3193 For verify we flush the pipeline after any (the only) rcpt address. */
3195 for (addr = sx->first_addr, address_count = 0;
3196 addr && address_count < sx->max_rcpt;
3197 addr = addr->next) if (addr->transport_return == PENDING_DEFER)
3203 addr->dsn_aware = sx->peer_offered & OPTION_DSN
3204 ? dsn_support_yes : dsn_support_no;
3207 no_flush = pipelining_active && !sx->verify
3208 && (!mua_wrapper || addr->next && address_count < sx->max_rcpt);
3210 build_rcptcmd_options(sx, addr);
3212 /* Now send the RCPT command, and process outstanding responses when
3213 necessary. After a timeout on RCPT, we just end the function, leaving the
3214 yield as OK, because this error can often mean that there is a problem with
3215 just one address, so we don't want to delay the host. */
3217 rcpt_addr = transport_rcpt_address(addr, sx->conn_args.tblock->rcpt_include_affixes);
3220 if ( testflag(sx->addrlist, af_utf8_downcvt)
3221 && !(rcpt_addr = string_address_utf8_to_alabel(rcpt_addr, NULL))
3224 /*XXX could we use a per-address errstr here? Not fail the whole send? */
3225 errno = ERRNO_EXPANDFAIL;
3226 return -5; /*XXX too harsh? */
3230 count = smtp_write_command(sx, no_flush ? SCMD_BUFFER : SCMD_FLUSH,
3231 "RCPT TO:<%s>%s%s\r\n", rcpt_addr, sx->igquotstr, sx->buffer);
3233 if (count < 0) return -5;
3236 switch(sync_responses(sx, count, 0))
3238 case 3: sx->ok = TRUE; /* 2xx & 5xx => OK & progress made */
3239 case 2: sx->completed_addr = TRUE; /* 5xx (only) => progress made */
3242 case 1: sx->ok = TRUE; /* 2xx (only) => OK, but if LMTP, */
3243 if (!sx->lmtp) /* can't tell about progress yet */
3244 sx->completed_addr = TRUE;
3245 case 0: /* No 2xx or 5xx, but no probs */
3248 case -1: return -3; /* Timeout on RCPT */
3249 case -2: return -2; /* non-MAIL read i/o error */
3250 default: return -1; /* any MAIL error */
3252 #ifdef EXPERIMENTAL_PIPE_CONNECT
3253 case -4: return -1; /* non-2xx for pipelined banner or EHLO */
3256 sx->pending_MAIL = FALSE; /* Dealt with MAIL */
3258 } /* Loop for next address */
3260 sx->next_addr = addr;
3266 /*****************************************************
3267 * Proxy TLS connection for another transport process *
3268 ******************************************************/
3270 Close the unused end of the pipe, fork once more, then use the given buffer
3271 as a staging area, and select on both the given fd and the TLS'd client-fd for
3272 data to read (per the coding in ip_recv() and fd_ready() this is legitimate).
3273 Do blocking full-size writes, and reads under a timeout. Once both input
3274 channels are closed, exit the process.
3278 buf space to use for buffering
3279 bufsiz size of buffer
3280 pfd pipe filedescriptor array; [0] is comms to proxied process
3281 timeout per-read timeout, seconds
3285 smtp_proxy_tls(void * ct_ctx, uschar * buf, size_t bsize, int * pfd,
3289 int max_fd = MAX(pfd[0], tls_out.active.sock) + 1;
3295 DEBUG(D_transport) debug_printf("proxy-proc final-pid %d\n", rc);
3296 _exit(rc < 0 ? EXIT_FAILURE : EXIT_SUCCESS);
3299 if (f.running_in_test_harness) millisleep(100); /* let parent debug out */
3300 set_process_info("proxying TLS connection for continued transport");
3302 FD_SET(tls_out.active.sock, &rfds);
3303 FD_SET(pfd[0], &rfds);
3305 for (int fd_bits = 3; fd_bits; )
3307 time_t time_left = timeout;
3308 time_t time_start = time(NULL);
3314 struct timeval tv = { time_left, 0 };
3317 (SELECT_ARG2_TYPE *)&rfds, NULL, (SELECT_ARG2_TYPE *)&efds, &tv);
3319 if (rc < 0 && errno == EINTR)
3320 if ((time_left -= time(NULL) - time_start) > 0) continue;
3324 DEBUG(D_transport) if (rc == 0) debug_printf("%s: timed out\n", __FUNCTION__);
3328 if (FD_ISSET(tls_out.active.sock, &efds) || FD_ISSET(pfd[0], &efds))
3330 DEBUG(D_transport) debug_printf("select: exceptional cond on %s fd\n",
3331 FD_ISSET(pfd[0], &efds) ? "proxy" : "tls");
3335 while (rc < 0 || !(FD_ISSET(tls_out.active.sock, &rfds) || FD_ISSET(pfd[0], &rfds)));
3337 /* handle inbound data */
3338 if (FD_ISSET(tls_out.active.sock, &rfds))
3339 if ((rc = tls_read(ct_ctx, buf, bsize)) <= 0)
3342 FD_CLR(tls_out.active.sock, &rfds);
3343 shutdown(pfd[0], SHUT_WR);
3348 for (int nbytes = 0; rc - nbytes > 0; nbytes += i)
3349 if ((i = write(pfd[0], buf + nbytes, rc - nbytes)) < 0) goto done;
3351 else if (fd_bits & 1)
3352 FD_SET(tls_out.active.sock, &rfds);
3354 /* handle outbound data */
3355 if (FD_ISSET(pfd[0], &rfds))
3356 if ((rc = read(pfd[0], buf, bsize)) <= 0)
3359 tls_close(ct_ctx, TLS_SHUTDOWN_NOWAIT);
3364 for (int nbytes = 0; rc - nbytes > 0; nbytes += i)
3365 if ((i = tls_write(ct_ctx, buf + nbytes, rc - nbytes, FALSE)) < 0)
3368 else if (fd_bits & 2)
3369 FD_SET(pfd[0], &rfds);
3373 if (f.running_in_test_harness) millisleep(100); /* let logging complete */
3374 exim_exit(0, US"TLS proxy");
3379 /*************************************************
3380 * Deliver address list to given host *
3381 *************************************************/
3383 /* If continue_hostname is not null, we get here only when continuing to
3384 deliver down an existing channel. The channel was passed as the standard
3385 input. TLS is never active on a passed channel; the previous process always
3386 closes it down before passing the connection on.
3388 Otherwise, we have to make a connection to the remote host, and do the
3389 initial protocol exchange.
3391 When running as an MUA wrapper, if the sender or any recipient is rejected,
3392 temporarily or permanently, we force failure for all recipients.
3395 addrlist chain of potential addresses to deliver; only those whose
3396 transport_return field is set to PENDING_DEFER are currently
3397 being processed; others should be skipped - they have either
3398 been delivered to an earlier host or IP address, or been
3399 failed by one of them.
3400 host host to deliver to
3401 host_af AF_INET or AF_INET6
3402 defport default TCP/IP port to use if host does not specify, in host
3404 interface interface to bind to, or NULL
3405 tblock transport instance block
3406 message_defer set TRUE if yield is OK, but all addresses were deferred
3407 because of a non-recipient, non-host failure, that is, a
3408 4xx response to MAIL FROM, DATA, or ".". This is a defer
3409 that is specific to the message.
3410 suppress_tls if TRUE, don't attempt a TLS connection - this is set for
3411 a second attempt after TLS initialization fails
3413 Returns: OK - the connection was made and the delivery attempted;
3414 the result for each address is in its data block.
3415 DEFER - the connection could not be made, or something failed
3416 while setting up the SMTP session, or there was a
3417 non-message-specific error, such as a timeout.
3418 ERROR - a filter command is specified for this transport,
3419 and there was a problem setting it up; OR helo_data
3420 or add_headers or authenticated_sender is specified
3421 for this transport, and the string failed to expand
3425 smtp_deliver(address_item *addrlist, host_item *host, int host_af, int defport,
3426 uschar *interface, transport_instance *tblock,
3427 BOOL *message_defer, BOOL suppress_tls)
3430 smtp_transport_options_block * ob = SOB tblock->options_block;
3434 struct timeval start_delivery_time;
3436 BOOL pass_message = FALSE;
3437 uschar *message = NULL;
3438 uschar new_message_id[MESSAGE_ID_LENGTH + 1];
3442 gettimeofday(&start_delivery_time, NULL);
3443 suppress_tls = suppress_tls; /* stop compiler warning when no TLS support */
3444 *message_defer = FALSE;
3446 sx.addrlist = addrlist;
3447 sx.conn_args.host = host;
3448 sx.conn_args.host_af = host_af,
3450 sx.conn_args.interface = interface;
3451 sx.helo_data = NULL;
3452 sx.conn_args.tblock = tblock;
3454 sx.sync_addr = sx.first_addr = addrlist;
3456 /* Get the channel set up ready for a message (MAIL FROM being the next
3457 SMTP command to send */
3459 if ((rc = smtp_setup_conn(&sx, suppress_tls)) != OK)
3462 /* If there is a filter command specified for this transport, we can now
3463 set it up. This cannot be done until the identify of the host is known. */
3465 if (tblock->filter_command)
3467 transport_filter_timeout = tblock->filter_timeout;
3469 /* On failure, copy the error to all addresses, abandon the SMTP call, and
3472 if (!transport_set_up_command(&transport_filter_argv,
3473 tblock->filter_command, TRUE, DEFER, addrlist,
3474 string_sprintf("%.50s transport", tblock->name), NULL))
3476 set_errno_nohost(addrlist->next, addrlist->basic_errno, addrlist->message, DEFER,
3482 if ( transport_filter_argv
3483 && *transport_filter_argv
3484 && **transport_filter_argv
3485 && sx.peer_offered & OPTION_CHUNKING
3488 sx.peer_offered &= ~OPTION_CHUNKING;
3489 DEBUG(D_transport) debug_printf("CHUNKING not usable due to transport filter\n");
3493 /* For messages that have more than the maximum number of envelope recipients,
3494 we want to send several transactions down the same SMTP connection. (See
3495 comments in deliver.c as to how this reconciles, heuristically, with
3496 remote_max_parallel.) This optimization was added to Exim after the following
3497 code was already working. The simplest way to put it in without disturbing the
3498 code was to use a goto to jump back to this point when there is another
3499 transaction to handle. */
3502 sx.from_addr = return_path;
3503 sx.sync_addr = sx.first_addr;
3505 sx.send_rset = TRUE;
3506 sx.completed_addr = FALSE;
3509 /* If we are a continued-connection-after-verify the MAIL and RCPT
3510 commands were already sent; do not re-send but do mark the addrs as
3511 having been accepted up to RCPT stage. A traditional cont-conn
3512 always has a sequence number greater than one. */
3514 if (continue_hostname && continue_sequence == 1)
3516 sx.peer_offered = smtp_peer_options;
3517 sx.pending_MAIL = FALSE;
3519 sx.next_addr = NULL;
3521 for (address_item * addr = addrlist; addr; addr = addr->next)
3522 addr->transport_return = PENDING_OK;
3526 /* Initiate a message transfer. */
3528 switch(smtp_write_mail_and_rcpt_cmds(&sx, &yield))
3531 case -1: case -2: goto RESPONSE_FAILED;
3532 case -3: goto END_OFF;
3533 case -4: goto SEND_QUIT;
3534 default: goto SEND_FAILED;
3537 /* If we are an MUA wrapper, abort if any RCPTs were rejected, either
3538 permanently or temporarily. We should have flushed and synced after the last
3546 for (a = sx.first_addr, cnt = 0; a && cnt < sx.max_rcpt; a = a->next, cnt++)
3547 if (a->transport_return != PENDING_OK)
3549 /*XXX could we find a better errno than 0 here? */
3550 set_errno_nohost(addrlist, 0, a->message, FAIL,
3551 testflag(a, af_pass_message));
3558 /* If ok is TRUE, we know we have got at least one good recipient, and must now
3559 send DATA, but if it is FALSE (in the normal, non-wrapper case), we may still
3560 have a good recipient buffered up if we are pipelining. We don't want to waste
3561 time sending DATA needlessly, so we only send it if either ok is TRUE or if we
3562 are pipelining. The responses are all handled by sync_responses().
3563 If using CHUNKING, do not send a BDAT until we know how big a chunk we want
3566 if ( !(sx.peer_offered & OPTION_CHUNKING)
3567 && (sx.ok || (pipelining_active && !mua_wrapper)))
3569 int count = smtp_write_command(&sx, SCMD_FLUSH, "DATA\r\n");
3571 if (count < 0) goto SEND_FAILED;
3572 switch(sync_responses(&sx, count, sx.ok ? +1 : -1))
3574 case 3: sx.ok = TRUE; /* 2xx & 5xx => OK & progress made */
3575 case 2: sx.completed_addr = TRUE; /* 5xx (only) => progress made */
3578 case 1: sx.ok = TRUE; /* 2xx (only) => OK, but if LMTP, */
3579 if (!sx.lmtp) sx.completed_addr = TRUE; /* can't tell about progress yet */
3580 case 0: break; /* No 2xx or 5xx, but no probs */
3582 case -1: goto END_OFF; /* Timeout on RCPT */
3584 #ifdef EXPERIMENTAL_PIPE_CONNECT
3585 case -4: HDEBUG(D_transport)
3586 debug_printf("failed reaping pipelined cmd responses\n");
3588 default: goto RESPONSE_FAILED; /* I/O error, or any MAIL/DATA error */
3590 pipelining_active = FALSE;
3591 data_command = string_copy(big_buffer); /* Save for later error message */
3594 /* If there were no good recipients (but otherwise there have been no
3595 problems), just set ok TRUE, since we have handled address-specific errors
3596 already. Otherwise, it's OK to send the message. Use the check/escape mechanism
3597 for handling the SMTP dot-handling protocol, flagging to apply to headers as
3598 well as body. Set the appropriate timeout value to be used for each chunk.
3599 (Haven't been able to make it work using select() for writing yet.) */
3601 if (!(sx.peer_offered & OPTION_CHUNKING) && !sx.ok)
3603 /* Save the first address of the next batch. */
3604 sx.first_addr = sx.next_addr;
3610 transport_ctx tctx = {
3611 .u = {.fd = sx.cctx.sock}, /*XXX will this need TLS info? */
3614 .check_string = US".",
3615 .escape_string = US"..", /* Escaping strings */
3617 topt_use_crlf | topt_escape_headers
3618 | (tblock->body_only ? topt_no_headers : 0)
3619 | (tblock->headers_only ? topt_no_body : 0)
3620 | (tblock->return_path_add ? topt_add_return_path : 0)
3621 | (tblock->delivery_date_add ? topt_add_delivery_date : 0)
3622 | (tblock->envelope_to_add ? topt_add_envelope_to : 0)
3625 /* If using CHUNKING we need a callback from the generic transport
3626 support to us, for the sending of BDAT smtp commands and the reaping
3627 of responses. The callback needs a whole bunch of state so set up
3628 a transport-context structure to be passed around. */
3630 if (sx.peer_offered & OPTION_CHUNKING)
3632 tctx.check_string = tctx.escape_string = NULL;
3633 tctx.options |= topt_use_bdat;
3634 tctx.chunk_cb = smtp_chunk_cmd_callback;
3635 sx.pending_BDAT = FALSE;
3636 sx.good_RCPT = sx.ok;
3638 tctx.smtp_context = &sx;
3641 tctx.options |= topt_end_dot;
3643 /* Save the first address of the next batch. */
3644 sx.first_addr = sx.next_addr;
3646 /* Responses from CHUNKING commands go in buffer. Otherwise,
3647 there has not been a response. */
3651 sigalrm_seen = FALSE;
3652 transport_write_timeout = ob->data_timeout;
3653 smtp_command = US"sending data block"; /* For error messages */
3654 DEBUG(D_transport|D_v)
3655 if (sx.peer_offered & OPTION_CHUNKING)
3656 debug_printf(" will write message using CHUNKING\n");
3658 debug_printf(" SMTP>> writing message and terminating \".\"\n");
3659 transport_count = 0;
3661 #ifndef DISABLE_DKIM
3662 dkim_exim_sign_init();
3663 # ifdef EXPERIMENTAL_ARC
3665 uschar * s = ob->arc_sign;
3668 if (!(ob->dkim.arc_signspec = s = expand_string(s)))
3670 if (!f.expand_string_forcedfail)
3672 message = US"failed to expand arc_sign";
3679 /* Ask dkim code to hash the body for ARC */
3680 (void) arc_ams_setup_sign_bodyhash();
3681 ob->dkim.force_bodyhash = TRUE;
3686 sx.ok = dkim_transport_write_message(&tctx, &ob->dkim, CUSS &message);
3688 sx.ok = transport_write_message(&tctx, 0);
3691 /* transport_write_message() uses write() because it is called from other
3692 places to write to non-sockets. This means that under some OS (e.g. Solaris)
3693 it can exit with "Broken pipe" as its error. This really means that the
3694 socket got closed at the far end. */
3696 transport_write_timeout = 0; /* for subsequent transports */
3698 /* Failure can either be some kind of I/O disaster (including timeout),
3699 or the failure of a transport filter or the expansion of added headers.
3700 Or, when CHUNKING, it can be a protocol-detected failure. */
3703 if (message) goto SEND_FAILED;
3704 else goto RESPONSE_FAILED;
3706 /* We used to send the terminating "." explicitly here, but because of
3707 buffering effects at both ends of TCP/IP connections, you don't gain
3708 anything by keeping it separate, so it might as well go in the final
3709 data buffer for efficiency. This is now done by setting the topt_end_dot
3712 smtp_command = US"end of data";
3714 if (sx.peer_offered & OPTION_CHUNKING && sx.cmd_count > 1)
3716 /* Reap any outstanding MAIL & RCPT commands, but not a DATA-go-ahead */
3717 switch(sync_responses(&sx, sx.cmd_count-1, 0))
3719 case 3: sx.ok = TRUE; /* 2xx & 5xx => OK & progress made */
3720 case 2: sx.completed_addr = TRUE; /* 5xx (only) => progress made */
3723 case 1: sx.ok = TRUE; /* 2xx (only) => OK, but if LMTP, */
3724 if (!sx.lmtp) sx.completed_addr = TRUE; /* can't tell about progress yet */
3725 case 0: break; /* No 2xx or 5xx, but no probs */
3727 case -1: goto END_OFF; /* Timeout on RCPT */
3729 #ifdef EXPERIMENTAL_PIPE_CONNECT
3730 case -4: HDEBUG(D_transport)
3731 debug_printf("failed reaping pipelined cmd responses\n");
3733 default: goto RESPONSE_FAILED; /* I/O error, or any MAIL/DATA error */
3737 #ifndef DISABLE_PRDR
3738 /* For PRDR we optionally get a partial-responses warning followed by the
3739 individual responses, before going on with the overall response. If we don't
3740 get the warning then deal with per non-PRDR. */
3744 sx.ok = smtp_read_response(&sx, sx.buffer, sizeof(sx.buffer), '3', ob->final_timeout);
3745 if (!sx.ok && errno == 0) switch(sx.buffer[0])
3747 case '2': sx.prdr_active = FALSE;
3750 case '4': errno = ERRNO_DATA4XX;
3751 addrlist->more_errno |=
3752 ((sx.buffer[1] - '0')*10 + sx.buffer[2] - '0') << 8;
3759 /* For non-PRDR SMTP, we now read a single response that applies to the
3760 whole message. If it is OK, then all the addresses have been delivered. */
3764 sx.ok = smtp_read_response(&sx, sx.buffer, sizeof(sx.buffer), '2',
3766 if (!sx.ok && errno == 0 && sx.buffer[0] == '4')
3768 errno = ERRNO_DATA4XX;
3769 addrlist->more_errno |= ((sx.buffer[1] - '0')*10 + sx.buffer[2] - '0') << 8;
3773 /* For LMTP, we get back a response for every RCPT command that we sent;
3774 some may be accepted and some rejected. For those that get a response, their
3775 status is fixed; any that are accepted have been handed over, even if later
3776 responses crash - at least, that's how I read RFC 2033.
3778 If all went well, mark the recipient addresses as completed, record which
3779 host/IPaddress they were delivered to, and cut out RSET when sending another
3780 message down the same channel. Write the completed addresses to the journal
3781 now so that they are recorded in case there is a crash of hardware or
3782 software before the spool gets updated. Also record the final SMTP
3783 confirmation if needed (for SMTP only). */
3788 struct timeval delivery_time;
3790 uschar * conf = NULL;
3792 timesince(&delivery_time, &start_delivery_time);
3793 sx.send_rset = FALSE;
3794 pipelining_active = FALSE;
3796 /* Set up confirmation if needed - applies only to SMTP */
3799 #ifdef DISABLE_EVENT
3800 LOGGING(smtp_confirmation) &&
3805 const uschar *s = string_printing(sx.buffer);
3806 /* deconst cast ok here as string_printing was checked to have alloc'n'copied */
3807 conf = (s == sx.buffer)? US string_copy(s) : US s;
3810 /* Process all transported addresses - for LMTP or PRDR, read a status for
3813 for (address_item * addr = addrlist; addr != sx.first_addr; addr = addr->next)
3815 if (addr->transport_return != PENDING_OK) continue;
3817 /* LMTP - if the response fails badly (e.g. timeout), use it for all the
3818 remaining addresses. Otherwise, it's a return code for just the one
3819 address. For temporary errors, add a retry item for the address so that
3820 it doesn't get tried again too soon. */
3822 #ifndef DISABLE_PRDR
3823 if (sx.lmtp || sx.prdr_active)
3828 if (!smtp_read_response(&sx, sx.buffer, sizeof(sx.buffer), '2',
3831 if (errno != 0 || sx.buffer[0] == 0) goto RESPONSE_FAILED;
3832 addr->message = string_sprintf(
3833 #ifndef DISABLE_PRDR
3834 "%s error after %s: %s", sx.prdr_active ? "PRDR":"LMTP",
3836 "LMTP error after %s: %s",
3838 data_command, string_printing(sx.buffer));
3839 setflag(addr, af_pass_message); /* Allow message to go to user */
3840 if (sx.buffer[0] == '5')
3841 addr->transport_return = FAIL;
3844 errno = ERRNO_DATA4XX;
3845 addr->more_errno |= ((sx.buffer[1] - '0')*10 + sx.buffer[2] - '0') << 8;
3846 addr->transport_return = DEFER;
3847 #ifndef DISABLE_PRDR
3848 if (!sx.prdr_active)
3850 retry_add_item(addr, addr->address_retry_key, 0);
3854 sx.completed_addr = TRUE; /* NOW we can set this flag */
3855 if (LOGGING(smtp_confirmation))
3857 const uschar *s = string_printing(sx.buffer);
3858 /* deconst cast ok here as string_printing was checked to have alloc'n'copied */
3859 conf = (s == sx.buffer) ? US string_copy(s) : US s;
3863 /* SMTP, or success return from LMTP for this address. Pass back the
3864 actual host that was used. */
3866 addr->transport_return = OK;
3867 addr->more_errno = delivery_time.tv_sec;
3868 addr->delivery_usec = delivery_time.tv_usec;
3869 addr->host_used = host;
3870 addr->special_action = flag;
3871 addr->message = conf;
3873 if (tcp_out_fastopen)
3875 setflag(addr, af_tcp_fastopen_conn);
3876 if (tcp_out_fastopen >= TFO_USED_NODATA) setflag(addr, af_tcp_fastopen);
3877 if (tcp_out_fastopen >= TFO_USED_DATA) setflag(addr, af_tcp_fastopen_data);
3879 if (sx.pipelining_used) setflag(addr, af_pipelining);
3880 #ifdef EXPERIMENTAL_PIPE_CONNECT
3881 if (sx.early_pipe_active) setflag(addr, af_early_pipe);
3883 #ifndef DISABLE_PRDR
3884 if (sx.prdr_active) setflag(addr, af_prdr_used);
3886 if (sx.peer_offered & OPTION_CHUNKING) setflag(addr, af_chunking_used);
3889 #ifndef DISABLE_PRDR
3890 if (!sx.prdr_active)
3893 /* Update the journal. For homonymic addresses, use the base address plus
3894 the transport name. See lots of comments in deliver.c about the reasons
3895 for the complications when homonyms are involved. Just carry on after
3896 write error, as it may prove possible to update the spool file later. */
3898 if (testflag(addr, af_homonym))
3899 sprintf(CS sx.buffer, "%.500s/%s\n", addr->unique + 3, tblock->name);
3901 sprintf(CS sx.buffer, "%.500s\n", addr->unique);
3903 DEBUG(D_deliver) debug_printf("S:journalling %s\n", sx.buffer);
3904 len = Ustrlen(CS sx.buffer);
3905 if (write(journal_fd, sx.buffer, len) != len)
3906 log_write(0, LOG_MAIN|LOG_PANIC, "failed to write journal for "
3907 "%s: %s", sx.buffer, strerror(errno));
3911 #ifndef DISABLE_PRDR
3914 const uschar * overall_message;
3916 /* PRDR - get the final, overall response. For any non-success
3917 upgrade all the address statuses. */
3919 sx.ok = smtp_read_response(&sx, sx.buffer, sizeof(sx.buffer), '2',
3923 if(errno == 0 && sx.buffer[0] == '4')
3925 errno = ERRNO_DATA4XX;
3926 addrlist->more_errno |= ((sx.buffer[1] - '0')*10 + sx.buffer[2] - '0') << 8;
3928 for (address_item * addr = addrlist; addr != sx.first_addr; addr = addr->next)
3929 if (sx.buffer[0] == '5' || addr->transport_return == OK)
3930 addr->transport_return = PENDING_OK; /* allow set_errno action */
3931 goto RESPONSE_FAILED;
3934 /* Append the overall response to the individual PRDR response for logging
3935 and update the journal, or setup retry. */
3937 overall_message = string_printing(sx.buffer);
3938 for (address_item * addr = addrlist; addr != sx.first_addr; addr = addr->next)
3939 if (addr->transport_return == OK)
3940 addr->message = string_sprintf("%s\\n%s", addr->message, overall_message);
3942 for (address_item * addr = addrlist; addr != sx.first_addr; addr = addr->next)
3943 if (addr->transport_return == OK)
3945 if (testflag(addr, af_homonym))
3946 sprintf(CS sx.buffer, "%.500s/%s\n", addr->unique + 3, tblock->name);
3948 sprintf(CS sx.buffer, "%.500s\n", addr->unique);
3950 DEBUG(D_deliver) debug_printf("journalling(PRDR) %s\n", sx.buffer);
3951 len = Ustrlen(CS sx.buffer);
3952 if (write(journal_fd, sx.buffer, len) != len)
3953 log_write(0, LOG_MAIN|LOG_PANIC, "failed to write journal for "
3954 "%s: %s", sx.buffer, strerror(errno));
3956 else if (addr->transport_return == DEFER)
3957 retry_add_item(addr, addr->address_retry_key, -2);
3961 /* Ensure the journal file is pushed out to disk. */
3963 if (EXIMfsync(journal_fd) < 0)
3964 log_write(0, LOG_MAIN|LOG_PANIC, "failed to fsync journal: %s",
3970 /* Handle general (not specific to one address) failures here. The value of ok
3971 is used to skip over this code on the falling through case. A timeout causes a
3972 deferral. Other errors may defer or fail according to the response code, and
3973 may set up a special errno value, e.g. after connection chopped, which is
3974 assumed if errno == 0 and there is no text in the buffer. If control reaches
3975 here during the setting up phase (i.e. before MAIL FROM) then always defer, as
3976 the problem is not related to this specific message. */
3981 uschar * set_message;
3987 sx.send_quit = check_response(host, &save_errno, addrlist->more_errno,
3988 sx.buffer, &code, &message, &pass_message);
3996 message = string_sprintf("send() to %s [%s] failed: %s",
3997 host->name, host->address, message ? message : US strerror(save_errno));
3998 sx.send_quit = FALSE;
4006 sx.ok = FALSE; /* For when reached by GOTO */
4007 set_message = message;
4009 /* We want to handle timeouts after MAIL or "." and loss of connection after
4010 "." specially. They can indicate a problem with the sender address or with
4011 the contents of the message rather than a real error on the connection. These
4012 cases are treated in the same way as a 4xx response. This next bit of code
4013 does the classification. */
4020 message_error = TRUE;
4024 message_error = Ustrncmp(smtp_command,"MAIL",4) == 0 ||
4025 Ustrncmp(smtp_command,"end ",4) == 0;
4028 case ERRNO_SMTPCLOSED:
4029 message_error = Ustrncmp(smtp_command,"end ",4) == 0;
4033 message_error = FALSE;
4037 /* Handle the cases that are treated as message errors. These are:
4039 (a) negative response or timeout after MAIL
4040 (b) negative response after DATA
4041 (c) negative response or timeout or dropped connection after "."
4042 (d) utf8 support required and not offered
4044 It won't be a negative response or timeout after RCPT, as that is dealt
4045 with separately above. The action in all cases is to set an appropriate
4046 error code for all the addresses, but to leave yield set to OK because the
4047 host itself has not failed. Of course, it might in practice have failed
4048 when we've had a timeout, but if so, we'll discover that at the next
4049 delivery attempt. For a temporary error, set the message_defer flag, and
4050 write to the logs for information if this is not the last host. The error
4051 for the last host will be logged as part of the address's log line. */
4055 if (mua_wrapper) code = '5'; /* Force hard failure in wrapper mode */
4057 /* If there's an errno, the message contains just the identity of
4062 else /* Anything other than 5 is treated as temporary */
4066 message = US string_sprintf("%s: %s", message, strerror(save_errno));
4068 write_logs(host, message, sx.first_addr ? sx.first_addr->basic_errno : 0);
4070 *message_defer = TRUE;
4074 /* Otherwise, we have an I/O error or a timeout other than after MAIL or
4075 ".", or some other transportation error. We defer all addresses and yield
4076 DEFER, except for the case of failed add_headers expansion, or a transport
4077 filter failure, when the yield should be ERROR, to stop it trying other
4082 #ifdef EXPERIMENTAL_PIPE_CONNECT
4083 /* If we were early-pipelinng and the actual EHLO response did not match
4084 the cached value we assumed, we could have detected it and passed a
4085 custom errno through to here. It would be nice to RSET and retry right
4086 away, but to reliably do that we eould need an extra synch point before
4087 we committed to data and that would discard half the gained roundrips.
4088 Or we could summarily drop the TCP connection. but that is also ugly.
4089 Instead, we ignore the possibility (having freshened the cache) and rely
4090 on the server telling us with a nonmessage error if we have tried to
4091 do something it no longer supports. */
4094 yield = (save_errno == ERRNO_CHHEADER_FAIL ||
4095 save_errno == ERRNO_FILTER_FAIL) ? ERROR : DEFER;
4099 set_errno(addrlist, save_errno, set_message, set_rc, pass_message, host
4100 #ifdef EXPERIMENTAL_DSN_INFO
4101 , sx.smtp_greeting, sx.helo_response
4107 /* If all has gone well, send_quit will be set TRUE, implying we can end the
4108 SMTP session tidily. However, if there were too many addresses to send in one
4109 message (indicated by first_addr being non-NULL) we want to carry on with the
4110 rest of them. Also, it is desirable to send more than one message down the SMTP
4111 connection if there are several waiting, provided we haven't already sent so
4112 many as to hit the configured limit. The function transport_check_waiting looks
4113 for a waiting message and returns its id. Then transport_pass_socket tries to
4114 set up a continued delivery by passing the socket on to another process. The
4115 variable send_rset is FALSE if a message has just been successfully transfered.
4117 If we are already sending down a continued channel, there may be further
4118 addresses not yet delivered that are aimed at the same host, but which have not
4119 been passed in this run of the transport. In this case, continue_more will be
4120 true, and all we should do is send RSET if necessary, and return, leaving the
4123 However, if no address was disposed of, i.e. all addresses got 4xx errors, we
4124 do not want to continue with other messages down the same channel, because that
4125 can lead to looping between two or more messages, all with the same,
4126 temporarily failing address(es). [The retry information isn't updated yet, so
4127 new processes keep on trying.] We probably also don't want to try more of this
4128 message's addresses either.
4130 If we have started a TLS session, we have to end it before passing the
4131 connection to a new process. However, not all servers can handle this (Exim
4132 can), so we do not pass such a connection on if the host matches
4133 hosts_nopass_tls. */
4136 debug_printf("ok=%d send_quit=%d send_rset=%d continue_more=%d "
4137 "yield=%d first_address is %sNULL\n", sx.ok, sx.send_quit,
4138 sx.send_rset, f.continue_more, yield, sx.first_addr ? "not " : "");
4140 if (sx.completed_addr && sx.ok && sx.send_quit)
4143 smtp_compare_t t_compare;
4145 t_compare.tblock = tblock;
4146 t_compare.current_sender_address = sender_address;
4148 if ( sx.first_addr != NULL
4152 ( tls_out.active.sock < 0 && !continue_proxy_cipher
4153 || verify_check_given_host(CUSS &ob->hosts_nopass_tls, host) != OK
4157 transport_check_waiting(tblock->name, host->name,
4158 tblock->connection_max_messages, new_message_id, &more,
4159 (oicf)smtp_are_same_identities, (void*)&t_compare)
4166 if (! (sx.ok = smtp_write_command(&sx, SCMD_FLUSH, "RSET\r\n") >= 0))
4168 msg = US string_sprintf("send() to %s [%s] failed: %s", host->name,
4169 host->address, strerror(errno));
4170 sx.send_quit = FALSE;
4172 else if (! (sx.ok = smtp_read_response(&sx, sx.buffer, sizeof(sx.buffer),
4173 '2', ob->command_timeout)))
4176 sx.send_quit = check_response(host, &errno, 0, sx.buffer, &code, &msg,
4180 DEBUG(D_transport) debug_printf("H=%s [%s] %s\n",
4181 host->name, host->address, msg);
4185 /* Either RSET was not needed, or it succeeded */
4192 int socket_fd = sx.cctx.sock;
4195 if (sx.first_addr != NULL) /* More addresses still to be sent */
4196 { /* in this run of the transport */
4197 continue_sequence++; /* Causes * in logging */
4201 /* Unless caller said it already has more messages listed for this host,
4202 pass the connection on to a new Exim process (below, the call to
4203 transport_pass_socket). If the caller has more ready, just return with
4204 the connection still open. */
4207 if (tls_out.active.sock >= 0)
4208 if ( f.continue_more
4209 || verify_check_given_host(CUSS &ob->hosts_noproxy_tls, host) == OK)
4211 /* Before passing the socket on, or returning to caller with it still
4212 open, we must shut down TLS. Not all MTAs allow for the continuation
4213 of the SMTP session when TLS is shut down. We test for this by sending
4214 a new EHLO. If we don't get a good response, we don't attempt to pass
4217 tls_close(sx.cctx.tls_ctx, TLS_SHUTDOWN_WAIT);
4218 sx.cctx.tls_ctx = NULL;
4219 smtp_peer_options = smtp_peer_options_wrap;
4221 && smtp_write_command(&sx, SCMD_FLUSH, "EHLO %s\r\n", sx.helo_data)
4223 && smtp_read_response(&sx, sx.buffer, sizeof(sx.buffer),
4224 '2', ob->command_timeout);
4226 if (sx.ok && f.continue_more)
4227 return yield; /* More addresses for another run */
4231 /* Set up a pipe for proxying TLS for the new transport process */
4233 smtp_peer_options |= OPTION_TLS;
4234 if (sx.ok = (socketpair(AF_UNIX, SOCK_STREAM, 0, pfd) == 0))
4237 set_errno(sx.first_addr, errno, US"internal allocation problem",
4239 # ifdef EXPERIMENTAL_DSN_INFO
4240 , sx.smtp_greeting, sx.helo_response
4246 if (f.continue_more)
4247 return yield; /* More addresses for another run */
4249 /* If the socket is successfully passed, we mustn't send QUIT (or
4250 indeed anything!) from here. */
4252 /*XXX DSN_INFO: assume likely to do new HELO; but for greet we'll want to
4253 propagate it from the initial
4255 if (sx.ok && transport_pass_socket(tblock->name, host->name,
4256 host->address, new_message_id, socket_fd))
4258 sx.send_quit = FALSE;
4260 /* We have passed the client socket to a fresh transport process.
4261 If TLS is still active, we need to proxy it for the transport we
4262 just passed the baton to. Fork a child to to do it, and return to
4263 get logging done asap. Which way to place the work makes assumptions
4264 about post-fork prioritisation which may not hold on all platforms. */
4266 if (tls_out.active.sock >= 0)
4269 if (pid == 0) /* child; fork again to disconnect totally */
4271 if (f.running_in_test_harness) millisleep(100); /* let parent debug out */
4272 /* does not return */
4273 smtp_proxy_tls(sx.cctx.tls_ctx, sx.buffer, sizeof(sx.buffer), pfd,
4274 ob->command_timeout);
4277 if (pid > 0) /* parent */
4279 DEBUG(D_transport) debug_printf("proxy-proc inter-pid %d\n", pid);
4281 /* tidy the inter-proc to disconn the proxy proc */
4282 waitpid(pid, NULL, 0);
4283 tls_close(sx.cctx.tls_ctx, TLS_NO_SHUTDOWN);
4284 sx.cctx.tls_ctx = NULL;
4285 (void)close(sx.cctx.sock);
4287 continue_transport = NULL;
4288 continue_hostname = NULL;
4291 log_write(0, LOG_PANIC_DIE, "fork failed");
4297 /* If RSET failed and there are addresses left, they get deferred. */
4299 set_errno(sx.first_addr, errno, msg, DEFER, FALSE, host
4300 #ifdef EXPERIMENTAL_DSN_INFO
4301 , sx.smtp_greeting, sx.helo_response
4307 /* End off tidily with QUIT unless the connection has died or the socket has
4308 been passed to another process. There has been discussion on the net about what
4309 to do after sending QUIT. The wording of the RFC suggests that it is necessary
4310 to wait for a response, but on the other hand, there isn't anything one can do
4311 with an error response, other than log it. Exim used to do that. However,
4312 further discussion suggested that it is positively advantageous not to wait for
4313 the response, but to close the session immediately. This is supposed to move
4314 the TCP/IP TIME_WAIT state from the server to the client, thereby removing some
4315 load from the server. (Hosts that are both servers and clients may not see much
4316 difference, of course.) Further discussion indicated that this was safe to do
4317 on Unix systems which have decent implementations of TCP/IP that leave the
4318 connection around for a while (TIME_WAIT) after the application has gone away.
4319 This enables the response sent by the server to be properly ACKed rather than
4320 timed out, as can happen on broken TCP/IP implementations on other OS.
4322 This change is being made on 31-Jul-98. After over a year of trouble-free
4323 operation, the old commented-out code was removed on 17-Sep-99. */
4326 if (sx.send_quit) (void)smtp_write_command(&sx, SCMD_FLUSH, "QUIT\r\n");
4331 tls_close(sx.cctx.tls_ctx, TLS_SHUTDOWN_NOWAIT);
4332 sx.cctx.tls_ctx = NULL;
4335 /* Close the socket, and return the appropriate value, first setting
4336 works because the NULL setting is passed back to the calling process, and
4337 remote_max_parallel is forced to 1 when delivering over an existing connection,
4339 If all went well and continue_more is set, we shouldn't actually get here if
4340 there are further addresses, as the return above will be taken. However,
4341 writing RSET might have failed, or there may be other addresses whose hosts are
4342 specified in the transports, and therefore not visible at top level, in which
4343 case continue_more won't get set. */
4345 HDEBUG(D_transport|D_acl|D_v) debug_printf_indent(" SMTP(close)>>\n");
4348 shutdown(sx.cctx.sock, SHUT_WR);
4349 millisleep(f.running_in_test_harness ? 200 : 20);
4350 if (fcntl(sx.cctx.sock, F_SETFL, O_NONBLOCK) == 0)
4351 for (int i = 16; read(sx.cctx.sock, sx.inbuffer, sizeof(sx.inbuffer)) > 0 && i > 0;)
4352 i--; /* drain socket */
4354 (void)close(sx.cctx.sock);
4356 #ifndef DISABLE_EVENT
4357 (void) event_raise(tblock->event_action, US"tcp:close", NULL);
4360 continue_transport = NULL;
4361 continue_hostname = NULL;
4368 /*************************************************
4369 * Closedown entry point *
4370 *************************************************/
4372 /* This function is called when exim is passed an open smtp channel
4373 from another incarnation, but the message which it has been asked
4374 to deliver no longer exists. The channel is on stdin.
4376 We might do fancy things like looking for another message to send down
4377 the channel, but if the one we sought has gone, it has probably been
4378 delivered by some other process that itself will seek further messages,
4379 so just close down our connection.
4381 Argument: pointer to the transport instance block
4386 smtp_transport_closedown(transport_instance *tblock)
4388 smtp_transport_options_block * ob = SOB tblock->options_block;
4389 client_conn_ctx cctx;
4392 uschar inbuffer[4096];
4393 uschar outbuffer[16];
4395 /*XXX really we need an active-smtp-client ctx, rather than assuming stdout */
4396 cctx.sock = fileno(stdin);
4397 cctx.tls_ctx = cctx.sock == tls_out.active.sock ? tls_out.active.tls_ctx : NULL;
4399 sx.inblock.cctx = &cctx;
4400 sx.inblock.buffer = inbuffer;
4401 sx.inblock.buffersize = sizeof(inbuffer);
4402 sx.inblock.ptr = inbuffer;
4403 sx.inblock.ptrend = inbuffer;
4405 sx.outblock.cctx = &cctx;
4406 sx.outblock.buffersize = sizeof(outbuffer);
4407 sx.outblock.buffer = outbuffer;
4408 sx.outblock.ptr = outbuffer;
4409 sx.outblock.cmd_count = 0;
4410 sx.outblock.authenticating = FALSE;
4412 (void)smtp_write_command(&sx, SCMD_FLUSH, "QUIT\r\n");
4413 (void)smtp_read_response(&sx, buffer, sizeof(buffer), '2', ob->command_timeout);
4414 (void)close(cctx.sock);
4419 /*************************************************
4420 * Prepare addresses for delivery *
4421 *************************************************/
4423 /* This function is called to flush out error settings from previous delivery
4424 attempts to other hosts. It also records whether we got here via an MX record
4425 or not in the more_errno field of the address. We are interested only in
4426 addresses that are still marked DEFER - others may have got delivered to a
4427 previously considered IP address. Set their status to PENDING_DEFER to indicate
4428 which ones are relevant this time.
4431 addrlist the list of addresses
4432 host the host we are delivering to
4434 Returns: the first address for this delivery
4437 static address_item *
4438 prepare_addresses(address_item *addrlist, host_item *host)
4440 address_item *first_addr = NULL;
4441 for (address_item * addr = addrlist; addr; addr = addr->next)
4442 if (addr->transport_return == DEFER)
4444 if (!first_addr) first_addr = addr;
4445 addr->transport_return = PENDING_DEFER;
4446 addr->basic_errno = 0;
4447 addr->more_errno = (host->mx >= 0)? 'M' : 'A';
4448 addr->message = NULL;
4450 addr->cipher = NULL;
4451 addr->ourcert = NULL;
4452 addr->peercert = NULL;
4453 addr->peerdn = NULL;
4454 addr->ocsp = OCSP_NOT_REQ;
4456 #ifdef EXPERIMENTAL_DSN_INFO
4457 addr->smtp_greeting = NULL;
4458 addr->helo_response = NULL;
4466 /*************************************************
4467 * Main entry point *
4468 *************************************************/
4470 /* See local README for interface details. As this is a remote transport, it is
4471 given a chain of addresses to be delivered in one connection, if possible. It
4472 always returns TRUE, indicating that each address has its own independent
4473 status set, except if there is a setting up problem, in which case it returns
4477 smtp_transport_entry(
4478 transport_instance *tblock, /* data for this instantiation */
4479 address_item *addrlist) /* addresses we are working on */
4482 int hosts_defer = 0;
4484 int hosts_looked_up = 0;
4485 int hosts_retry = 0;
4486 int hosts_serial = 0;
4487 int hosts_total = 0;
4488 int total_hosts_tried = 0;
4490 BOOL expired = TRUE;
4491 uschar *expanded_hosts = NULL;
4493 uschar *tid = string_sprintf("%s transport", tblock->name);
4494 smtp_transport_options_block *ob = SOB tblock->options_block;
4495 host_item *hostlist = addrlist->host_list;
4500 debug_printf("%s transport entered\n", tblock->name);
4501 for (address_item * addr = addrlist; addr; addr = addr->next)
4502 debug_printf(" %s\n", addr->address);
4505 debug_printf("hostlist:\n");
4506 for (host_item * host = hostlist; host; host = host->next)
4507 debug_printf(" '%s' IP %s port %d\n", host->name, host->address, host->port);
4509 if (continue_hostname)
4510 debug_printf("already connected to %s [%s] (on fd %d)\n",
4511 continue_hostname, continue_host_address,
4512 cutthrough.cctx.sock >= 0 ? cutthrough.cctx.sock : 0);
4515 /* Set the flag requesting that these hosts be added to the waiting
4516 database if the delivery fails temporarily or if we are running with
4517 queue_smtp or a 2-stage queue run. This gets unset for certain
4518 kinds of error, typically those that are specific to the message. */
4520 update_waiting = TRUE;
4522 /* If a host list is not defined for the addresses - they must all have the
4523 same one in order to be passed to a single transport - or if the transport has
4524 a host list with hosts_override set, use the host list supplied with the
4525 transport. It is an error for this not to exist. */
4527 #if defined(SUPPORT_TLS) && defined(EXPERIMENTAL_REQUIRETLS)
4528 if (tls_requiretls & REQUIRETLS_MSG)
4529 ob->tls_tempfail_tryclear = FALSE; /*XXX surely we should have a local for this
4530 rather than modifying the transport? */
4533 if (!hostlist || (ob->hosts_override && ob->hosts))
4537 addrlist->message = string_sprintf("%s transport called with no hosts set",
4539 addrlist->transport_return = PANIC;
4540 return FALSE; /* Only top address has status */
4543 DEBUG(D_transport) debug_printf("using the transport's hosts: %s\n",
4546 /* If the transport's host list contains no '$' characters, and we are not
4547 randomizing, it is fixed and therefore a chain of hosts can be built once
4548 and for all, and remembered for subsequent use by other calls to this
4549 transport. If, on the other hand, the host list does contain '$', or we are
4550 randomizing its order, we have to rebuild it each time. In the fixed case,
4551 as the hosts string will never be used again, it doesn't matter that we
4552 replace all the : characters with zeros. */
4556 uschar *s = ob->hosts;
4558 if (Ustrchr(s, '$') != NULL)
4560 if (!(expanded_hosts = expand_string(s)))
4562 addrlist->message = string_sprintf("failed to expand list of hosts "
4563 "\"%s\" in %s transport: %s", s, tblock->name, expand_string_message);
4564 addrlist->transport_return = f.search_find_defer ? DEFER : PANIC;
4565 return FALSE; /* Only top address has status */
4567 DEBUG(D_transport) debug_printf("expanded list of hosts \"%s\" to "
4568 "\"%s\"\n", s, expanded_hosts);
4572 if (ob->hosts_randomize) s = expanded_hosts = string_copy(s);
4574 host_build_hostlist(&hostlist, s, ob->hosts_randomize);
4576 /* Check that the expansion yielded something useful. */
4580 string_sprintf("%s transport has empty hosts setting", tblock->name);
4581 addrlist->transport_return = PANIC;
4582 return FALSE; /* Only top address has status */
4585 /* If there was no expansion of hosts, save the host list for
4588 if (!expanded_hosts) ob->hostlist = hostlist;
4591 /* This is not the first time this transport has been run in this delivery;
4592 the host list was built previously. */
4595 hostlist = ob->hostlist;
4598 /* The host list was supplied with the address. If hosts_randomize is set, we
4599 must sort it into a random order if it did not come from MX records and has not
4600 already been randomized (but don't bother if continuing down an existing
4603 else if (ob->hosts_randomize && hostlist->mx == MX_NONE && !continue_hostname)
4605 host_item *newlist = NULL;
4608 host_item *h = hostlist;
4609 hostlist = hostlist->next;
4611 h->sort_key = random_number(100);
4618 else if (h->sort_key < newlist->sort_key)
4625 host_item *hh = newlist;
4628 if (h->sort_key < hh->next->sort_key) break;
4636 hostlist = addrlist->host_list = newlist;
4639 /* Sort out the default port. */
4641 if (!smtp_get_port(ob->port, addrlist, &defport, tid)) return FALSE;
4643 /* For each host-plus-IP-address on the list:
4645 . If this is a continued delivery and the host isn't the one with the
4646 current connection, skip.
4648 . If the status is unusable (i.e. previously failed or retry checked), skip.
4650 . If no IP address set, get the address, either by turning the name into
4651 an address, calling gethostbyname if gethostbyname is on, or by calling
4652 the DNS. The DNS may yield multiple addresses, in which case insert the
4653 extra ones into the list.
4655 . Get the retry data if not previously obtained for this address and set the
4656 field which remembers the state of this address. Skip if the retry time is
4657 not reached. If not, remember whether retry data was found. The retry string
4658 contains both the name and the IP address.
4660 . Scan the list of addresses and mark those whose status is DEFER as
4661 PENDING_DEFER. These are the only ones that will be processed in this cycle
4664 . Make a delivery attempt - addresses marked PENDING_DEFER will be tried.
4665 Some addresses may be successfully delivered, others may fail, and yet
4666 others may get temporary errors and so get marked DEFER.
4668 . The return from the delivery attempt is OK if a connection was made and a
4669 valid SMTP dialogue was completed. Otherwise it is DEFER.
4671 . If OK, add a "remove" retry item for this host/IPaddress, if any.
4673 . If fail to connect, or other defer state, add a retry item.
4675 . If there are any addresses whose status is still DEFER, carry on to the
4676 next host/IPaddress, unless we have tried the number of hosts given
4677 by hosts_max_try or hosts_max_try_hardlimit; otherwise return. Note that
4678 there is some fancy logic for hosts_max_try that means its limit can be
4679 overstepped in some circumstances.
4681 If we get to the end of the list, all hosts have deferred at least one address,
4682 or not reached their retry times. If delay_after_cutoff is unset, it requests a
4683 delivery attempt to those hosts whose last try was before the arrival time of
4684 the current message. To cope with this, we have to go round the loop a second
4685 time. After that, set the status and error data for any addresses that haven't
4686 had it set already. */
4688 for (int cutoff_retry = 0;
4689 expired && cutoff_retry < (ob->delay_after_cutoff ? 1 : 2);
4692 host_item *nexthost = NULL;
4693 int unexpired_hosts_tried = 0;
4694 BOOL continue_host_tried = FALSE;
4696 retry_non_continued:
4697 for (host = hostlist;
4699 && unexpired_hosts_tried < ob->hosts_max_try
4700 && total_hosts_tried < ob->hosts_max_try_hardlimit;
4706 BOOL host_is_expired = FALSE;
4707 BOOL message_defer = FALSE;
4708 BOOL some_deferred = FALSE;
4709 address_item *first_addr = NULL;
4710 uschar *interface = NULL;
4711 uschar *retry_host_key = NULL;
4712 uschar *retry_message_key = NULL;
4713 uschar *serialize_key = NULL;
4715 /* Default next host is next host. :-) But this can vary if the
4716 hosts_max_try limit is hit (see below). It may also be reset if a host
4717 address is looked up here (in case the host was multihomed). */
4719 nexthost = host->next;
4721 /* If the address hasn't yet been obtained from the host name, look it up
4722 now, unless the host is already marked as unusable. If it is marked as
4723 unusable, it means that the router was unable to find its IP address (in
4724 the DNS or wherever) OR we are in the 2nd time round the cutoff loop, and
4725 the lookup failed last time. We don't get this far if *all* MX records
4726 point to non-existent hosts; that is treated as a hard error.
4728 We can just skip this host entirely. When the hosts came from the router,
4729 the address will timeout based on the other host(s); when the address is
4730 looked up below, there is an explicit retry record added.
4732 Note that we mustn't skip unusable hosts if the address is not unset; they
4733 may be needed as expired hosts on the 2nd time round the cutoff loop. */
4737 int new_port, flags;
4739 if (host->status >= hstatus_unusable)
4741 DEBUG(D_transport) debug_printf("%s has no address and is unusable - skipping\n",
4746 DEBUG(D_transport) debug_printf("getting address for %s\n", host->name);
4748 /* The host name is permitted to have an attached port. Find it, and
4749 strip it from the name. Just remember it for now. */
4751 new_port = host_item_get_port(host);
4753 /* Count hosts looked up */
4757 /* Find by name if so configured, or if it's an IP address. We don't
4758 just copy the IP address, because we need the test-for-local to happen. */
4760 flags = HOST_FIND_BY_A | HOST_FIND_BY_AAAA;
4761 if (ob->dns_qualify_single) flags |= HOST_FIND_QUALIFY_SINGLE;
4762 if (ob->dns_search_parents) flags |= HOST_FIND_SEARCH_PARENTS;
4764 if (ob->gethostbyname || string_is_ip_address(host->name, NULL) != 0)
4765 rc = host_find_byname(host, NULL, flags, NULL, TRUE);
4767 rc = host_find_bydns(host, NULL, flags, NULL, NULL, NULL,
4768 &ob->dnssec, /* domains for request/require */
4771 /* Update the host (and any additional blocks, resulting from
4772 multihoming) with a host-specific port, if any. */
4774 for (host_item * hh = host; hh != nexthost; hh = hh->next) hh->port = new_port;
4776 /* Failure to find the host at this time (usually DNS temporary failure)
4777 is really a kind of routing failure rather than a transport failure.
4778 Therefore we add a retry item of the routing kind, not to stop us trying
4779 to look this name up here again, but to ensure the address gets timed
4780 out if the failures go on long enough. A complete failure at this point
4781 commonly points to a configuration error, but the best action is still
4782 to carry on for the next host. */
4784 if (rc == HOST_FIND_AGAIN || rc == HOST_FIND_SECURITY || rc == HOST_FIND_FAILED)
4786 retry_add_item(addrlist, string_sprintf("R:%s", host->name), 0);
4788 if (rc == HOST_FIND_AGAIN) hosts_defer++; else hosts_fail++;
4789 DEBUG(D_transport) debug_printf("rc = %s for %s\n", (rc == HOST_FIND_AGAIN)?
4790 "HOST_FIND_AGAIN" : "HOST_FIND_FAILED", host->name);
4791 host->status = hstatus_unusable;
4793 for (address_item * addr = addrlist; addr; addr = addr->next)
4795 if (addr->transport_return != DEFER) continue;
4796 addr->basic_errno = ERRNO_UNKNOWNHOST;
4797 addr->message = string_sprintf(
4798 rc == HOST_FIND_SECURITY
4799 ? "lookup of IP address for %s was insecure"
4800 : "failed to lookup IP address for %s",
4806 /* If the host is actually the local host, we may have a problem, or
4807 there may be some cunning configuration going on. In the problem case,
4808 log things and give up. The default transport status is already DEFER. */
4810 if (rc == HOST_FOUND_LOCAL && !ob->allow_localhost)
4812 for (address_item * addr = addrlist; addr; addr = addr->next)
4814 addr->basic_errno = 0;
4815 addr->message = string_sprintf("%s transport found host %s to be "
4816 "local", tblock->name, host->name);
4820 } /* End of block for IP address lookup */
4822 /* If this is a continued delivery, we are interested only in the host
4823 which matches the name of the existing open channel. The check is put
4824 here after the local host lookup, in case the name gets expanded as a
4825 result of the lookup. Set expired FALSE, to save the outer loop executing
4828 if (continue_hostname)
4829 if ( Ustrcmp(continue_hostname, host->name) != 0
4830 || Ustrcmp(continue_host_address, host->address) != 0
4834 continue; /* With next host */
4837 continue_host_tried = TRUE;
4839 /* Reset the default next host in case a multihomed host whose addresses
4840 are not looked up till just above added to the host list. */
4842 nexthost = host->next;
4844 /* If queue_smtp is set (-odqs or the first part of a 2-stage run), or the
4845 domain is in queue_smtp_domains, we don't actually want to attempt any
4846 deliveries. When doing a queue run, queue_smtp_domains is always unset. If
4847 there is a lookup defer in queue_smtp_domains, proceed as if the domain
4848 were not in it. We don't want to hold up all SMTP deliveries! Except when
4849 doing a two-stage queue run, don't do this if forcing. */
4851 if ((!f.deliver_force || f.queue_2stage) && (f.queue_smtp ||
4852 match_isinlist(addrlist->domain,
4853 (const uschar **)&queue_smtp_domains, 0,
4854 &domainlist_anchor, NULL, MCL_DOMAIN, TRUE, NULL) == OK))
4857 for (address_item * addr = addrlist; addr; addr = addr->next)
4858 if (addr->transport_return == DEFER)
4859 addr->message = US"domain matches queue_smtp_domains, or -odqs set";
4860 continue; /* With next host */
4863 /* Count hosts being considered - purely for an intelligent comment
4864 if none are usable. */
4868 /* Set $host and $host address now in case they are needed for the
4869 interface expansion or the serialize_hosts check; they remain set if an
4870 actual delivery happens. */
4872 deliver_host = host->name;
4873 deliver_host_address = host->address;
4874 lookup_dnssec_authenticated = host->dnssec == DS_YES ? US"yes"
4875 : host->dnssec == DS_NO ? US"no"
4878 /* Set up a string for adding to the retry key if the port number is not
4879 the standard SMTP port. A host may have its own port setting that overrides
4882 pistring = string_sprintf(":%d", host->port == PORT_NONE
4883 ? defport : host->port);
4884 if (Ustrcmp(pistring, ":25") == 0) pistring = US"";
4886 /* Select IPv4 or IPv6, and choose an outgoing interface. If the interface
4887 string is set, even if constant (as different transports can have different
4888 constant settings), we must add it to the key that is used for retries,
4889 because connections to the same host from a different interface should be
4890 treated separately. */
4892 host_af = Ustrchr(host->address, ':') == NULL ? AF_INET : AF_INET6;
4893 if ((rs = ob->interface) && *rs)
4895 if (!smtp_get_interface(rs, host_af, addrlist, &interface, tid))
4897 pistring = string_sprintf("%s/%s", pistring, interface);
4900 /* The first time round the outer loop, check the status of the host by
4901 inspecting the retry data. The second time round, we are interested only
4902 in expired hosts that haven't been tried since this message arrived. */
4904 if (cutoff_retry == 0)
4907 /* Ensure the status of the address is set by checking retry data if
4908 necessary. There may be host-specific retry data (applicable to all
4909 messages) and also data for retries of a specific message at this host.
4910 If either of these retry records are actually read, the keys used are
4911 returned to save recomputing them later. */
4913 if (exp_bool(addrlist, US"transport", tblock->name, D_transport,
4914 US"retry_include_ip_address", ob->retry_include_ip_address,
4915 ob->expand_retry_include_ip_address, &incl_ip) != OK)
4916 continue; /* with next host */
4918 host_is_expired = retry_check_address(addrlist->domain, host, pistring,
4919 incl_ip, &retry_host_key, &retry_message_key);
4921 DEBUG(D_transport) debug_printf("%s [%s]%s retry-status = %s\n", host->name,
4922 host->address ? host->address : US"", pistring,
4923 host->status == hstatus_usable ? "usable"
4924 : host->status == hstatus_unusable ? "unusable"
4925 : host->status == hstatus_unusable_expired ? "unusable (expired)" : "?");
4927 /* Skip this address if not usable at this time, noting if it wasn't
4928 actually expired, both locally and in the address. */
4930 switch (host->status)
4932 case hstatus_unusable:
4934 setflag(addrlist, af_retry_skipped);
4937 case hstatus_unusable_expired:
4940 case hwhy_retry: hosts_retry++; break;
4941 case hwhy_failed: hosts_fail++; break;
4943 case hwhy_deferred: hosts_defer++; break;
4946 /* If there was a retry message key, implying that previously there
4947 was a message-specific defer, we don't want to update the list of
4948 messages waiting for these hosts. */
4950 if (retry_message_key) update_waiting = FALSE;
4951 continue; /* With the next host or IP address */
4955 /* Second time round the loop: if the address is set but expired, and
4956 the message is newer than the last try, let it through. */
4961 || host->status != hstatus_unusable_expired
4962 || host->last_try > received_time.tv_sec)
4964 DEBUG(D_transport) debug_printf("trying expired host %s [%s]%s\n",
4965 host->name, host->address, pistring);
4966 host_is_expired = TRUE;
4969 /* Setting "expired=FALSE" doesn't actually mean not all hosts are expired;
4970 it remains TRUE only if all hosts are expired and none are actually tried.
4975 /* If this host is listed as one to which access must be serialized,
4976 see if another Exim process has a connection to it, and if so, skip
4977 this host. If not, update the database to record our connection to it
4978 and remember this for later deletion. Do not do any of this if we are
4979 sending the message down a pre-existing connection. */
4981 if ( !continue_hostname
4982 && verify_check_given_host(CUSS &ob->serialize_hosts, host) == OK)
4984 serialize_key = string_sprintf("host-serialize-%s", host->name);
4985 if (!enq_start(serialize_key, 1))
4988 debug_printf("skipping host %s because another Exim process "
4989 "is connected to it\n", host->name);
4995 /* OK, we have an IP address that is not waiting for its retry time to
4996 arrive (it might be expired) OR (second time round the loop) we have an
4997 expired host that hasn't been tried since the message arrived. Have a go
4998 at delivering the message to it. First prepare the addresses by flushing
4999 out the result of previous attempts, and finding the first address that
5000 is still to be delivered. */
5002 first_addr = prepare_addresses(addrlist, host);
5004 DEBUG(D_transport) debug_printf("delivering %s to %s [%s] (%s%s)\n",
5005 message_id, host->name, host->address, addrlist->address,
5006 addrlist->next ? ", ..." : "");
5008 set_process_info("delivering %s to %s [%s]%s (%s%s)",
5009 message_id, host->name, host->address, pistring, addrlist->address,
5010 addrlist->next ? ", ..." : "");
5012 /* This is not for real; don't do the delivery. If there are
5013 any remaining hosts, list them. */
5017 set_errno_nohost(addrlist, 0, NULL, OK, FALSE);
5018 for (address_item * addr = addrlist; addr; addr = addr->next)
5020 addr->host_used = host;
5021 addr->special_action = '*';
5022 addr->message = US"delivery bypassed by -N option";
5026 debug_printf("*** delivery by %s transport bypassed by -N option\n"
5027 "*** host and remaining hosts:\n", tblock->name);
5028 for (host_item * host2 = host; host2; host2 = host2->next)
5029 debug_printf(" %s [%s]\n", host2->name,
5030 host2->address ? host2->address : US"unset");
5035 /* This is for real. If the host is expired, we don't count it for
5036 hosts_max_retry. This ensures that all hosts must expire before an address
5037 is timed out, unless hosts_max_try_hardlimit (which protects against
5038 lunatic DNS configurations) is reached.
5040 If the host is not expired and we are about to hit the hosts_max_retry
5041 limit, check to see if there is a subsequent hosts with a different MX
5042 value. If so, make that the next host, and don't count this one. This is a
5043 heuristic to make sure that different MXs do get tried. With a normal kind
5044 of retry rule, they would get tried anyway when the earlier hosts were
5045 delayed, but if the domain has a "retry every time" type of rule - as is
5046 often used for the the very large ISPs, that won't happen. */
5051 /* Make a copy of the host if it is local to this invocation
5052 of the transport. */
5056 thost = store_get(sizeof(host_item));
5058 thost->name = string_copy(host->name);
5059 thost->address = string_copy(host->address);
5064 if (!host_is_expired && ++unexpired_hosts_tried >= ob->hosts_max_try)
5067 debug_printf("hosts_max_try limit reached with this host\n");
5068 for (host_item * h = host; h; h = h->next) if (h->mx != host->mx)
5071 unexpired_hosts_tried--;
5072 DEBUG(D_transport) debug_printf("however, a higher MX host exists "
5073 "and will be tried\n");
5078 /* Attempt the delivery. */
5080 total_hosts_tried++;
5081 rc = smtp_deliver(addrlist, thost, host_af, defport, interface, tblock,
5082 &message_defer, FALSE);
5085 OK => connection made, each address contains its result;
5086 message_defer is set for message-specific defers (when all
5087 recipients are marked defer)
5088 DEFER => there was a non-message-specific delivery problem;
5089 ERROR => there was a problem setting up the arguments for a filter,
5090 or there was a problem with expanding added headers
5093 /* If the result is not OK, there was a non-message-specific problem.
5094 If the result is DEFER, we need to write to the logs saying what happened
5095 for this particular host, except in the case of authentication and TLS
5096 failures, where the log has already been written. If all hosts defer a
5097 general message is written at the end. */
5099 if (rc == DEFER && first_addr->basic_errno != ERRNO_AUTHFAIL
5100 && first_addr->basic_errno != ERRNO_TLSFAILURE)
5101 write_logs(host, first_addr->message, first_addr->basic_errno);
5103 #ifndef DISABLE_EVENT
5105 deferred_event_raise(first_addr, host);
5108 /* If STARTTLS was accepted, but there was a failure in setting up the
5109 TLS session (usually a certificate screwup), and the host is not in
5110 hosts_require_tls, and tls_tempfail_tryclear is true, try again, with
5111 TLS forcibly turned off. We have to start from scratch with a new SMTP
5112 connection. That's why the retry is done from here, not from within
5113 smtp_deliver(). [Rejections of STARTTLS itself don't screw up the
5114 session, so the in-clear transmission after those errors, if permitted,
5115 happens inside smtp_deliver().] */
5119 && first_addr->basic_errno == ERRNO_TLSFAILURE
5120 && ob->tls_tempfail_tryclear
5121 && verify_check_given_host(CUSS &ob->hosts_require_tls, host) != OK
5124 log_write(0, LOG_MAIN,
5125 "%s: delivering unencrypted to H=%s [%s] (not in hosts_require_tls)",
5126 first_addr->message, host->name, host->address);
5127 first_addr = prepare_addresses(addrlist, host);
5128 rc = smtp_deliver(addrlist, thost, host_af, defport, interface, tblock,
5129 &message_defer, TRUE);
5130 if (rc == DEFER && first_addr->basic_errno != ERRNO_AUTHFAIL)
5131 write_logs(host, first_addr->message, first_addr->basic_errno);
5132 # ifndef DISABLE_EVENT
5134 deferred_event_raise(first_addr, host);
5137 #endif /*SUPPORT_TLS*/
5140 /* Delivery attempt finished */
5142 rs = rc == OK ? US"OK"
5143 : rc == DEFER ? US"DEFER"
5144 : rc == ERROR ? US"ERROR"
5147 set_process_info("delivering %s: just tried %s [%s]%s for %s%s: result %s",
5148 message_id, host->name, host->address, pistring, addrlist->address,
5149 addrlist->next ? " (& others)" : "", rs);
5151 /* Release serialization if set up */
5153 if (serialize_key) enq_end(serialize_key);
5155 /* If the result is DEFER, or if a host retry record is known to exist, we
5156 need to add an item to the retry chain for updating the retry database
5157 at the end of delivery. We only need to add the item to the top address,
5158 of course. Also, if DEFER, we mark the IP address unusable so as to skip it
5159 for any other delivery attempts using the same address. (It is copied into
5160 the unusable tree at the outer level, so even if different address blocks
5161 contain the same address, it still won't get tried again.) */
5163 if (rc == DEFER || retry_host_key)
5165 int delete_flag = rc != DEFER ? rf_delete : 0;
5166 if (!retry_host_key)
5169 if (exp_bool(addrlist, US"transport", tblock->name, D_transport,
5170 US"retry_include_ip_address", ob->retry_include_ip_address,
5171 ob->expand_retry_include_ip_address, &incl_ip) != OK)
5172 incl_ip = TRUE; /* error; use most-specific retry record */
5174 retry_host_key = incl_ip
5175 ? string_sprintf("T:%S:%s%s", host->name, host->address, pistring)
5176 : string_sprintf("T:%S%s", host->name, pistring);
5179 /* If a delivery of another message over an existing SMTP connection
5180 yields DEFER, we do NOT set up retry data for the host. This covers the
5181 case when there are delays in routing the addresses in the second message
5182 that are so long that the server times out. This is alleviated by not
5183 routing addresses that previously had routing defers when handling an
5184 existing connection, but even so, this case may occur (e.g. if a
5185 previously happily routed address starts giving routing defers). If the
5186 host is genuinely down, another non-continued message delivery will
5187 notice it soon enough. */
5189 if (delete_flag != 0 || !continue_hostname)
5190 retry_add_item(first_addr, retry_host_key, rf_host | delete_flag);
5192 /* We may have tried an expired host, if its retry time has come; ensure
5193 the status reflects the expiry for the benefit of any other addresses. */
5197 host->status = host_is_expired
5198 ? hstatus_unusable_expired : hstatus_unusable;
5199 host->why = hwhy_deferred;
5203 /* If message_defer is set (host was OK, but every recipient got deferred
5204 because of some message-specific problem), or if that had happened
5205 previously so that a message retry key exists, add an appropriate item
5206 to the retry chain. Note that if there was a message defer but now there is
5207 a host defer, the message defer record gets deleted. That seems perfectly
5208 reasonable. Also, stop the message from being remembered as waiting
5209 for specific hosts. */
5211 if (message_defer || retry_message_key)
5213 int delete_flag = message_defer ? 0 : rf_delete;
5214 if (!retry_message_key)
5217 if (exp_bool(addrlist, US"transport", tblock->name, D_transport,
5218 US"retry_include_ip_address", ob->retry_include_ip_address,
5219 ob->expand_retry_include_ip_address, &incl_ip) != OK)
5220 incl_ip = TRUE; /* error; use most-specific retry record */
5222 retry_message_key = incl_ip
5223 ? string_sprintf("T:%S:%s%s:%s", host->name, host->address, pistring,
5225 : string_sprintf("T:%S%s:%s", host->name, pistring, message_id);
5227 retry_add_item(addrlist, retry_message_key,
5228 rf_message | rf_host | delete_flag);
5229 update_waiting = FALSE;
5232 /* Any return other than DEFER (that is, OK or ERROR) means that the
5233 addresses have got their final statuses filled in for this host. In the OK
5234 case, see if any of them are deferred. */
5237 for (address_item * addr = addrlist; addr; addr = addr->next)
5238 if (addr->transport_return == DEFER)
5240 some_deferred = TRUE;
5244 /* If no addresses deferred or the result was ERROR, return. We do this for
5245 ERROR because a failing filter set-up or add_headers expansion is likely to
5246 fail for any host we try. */
5248 if (rc == ERROR || (rc == OK && !some_deferred))
5250 DEBUG(D_transport) debug_printf("Leaving %s transport\n", tblock->name);
5251 return TRUE; /* Each address has its status */
5254 /* If the result was DEFER or some individual addresses deferred, let
5255 the loop run to try other hosts with the deferred addresses, except for the
5256 case when we were trying to deliver down an existing channel and failed.
5257 Don't try any other hosts in this case. */
5259 if (continue_hostname) break;
5261 /* If the whole delivery, or some individual addresses, were deferred and
5262 there are more hosts that could be tried, do not count this host towards
5263 the hosts_max_try limit if the age of the message is greater than the
5264 maximum retry time for this host. This means we may try try all hosts,
5265 ignoring the limit, when messages have been around for some time. This is
5266 important because if we don't try all hosts, the address will never time
5267 out. NOTE: this does not apply to hosts_max_try_hardlimit. */
5269 if ((rc == DEFER || some_deferred) && nexthost)
5272 retry_config *retry = retry_find_config(host->name, NULL, 0, 0);
5274 if (retry && retry->rules)
5276 retry_rule *last_rule;
5277 for (last_rule = retry->rules;
5279 last_rule = last_rule->next);
5280 timedout = time(NULL) - received_time.tv_sec > last_rule->timeout;
5282 else timedout = TRUE; /* No rule => timed out */
5286 unexpired_hosts_tried--;
5287 DEBUG(D_transport) debug_printf("temporary delivery error(s) override "
5288 "hosts_max_try (message older than host's retry time)\n");
5294 if (unexpired_hosts_tried >= ob->hosts_max_try)
5295 debug_printf("reached transport hosts_max_try limit %d\n",
5297 if (total_hosts_tried >= ob->hosts_max_try_hardlimit)
5298 debug_printf("reached transport hosts_max_try_hardlimit limit %d\n",
5299 ob->hosts_max_try_hardlimit);
5302 if (f.running_in_test_harness) millisleep(500); /* let server debug out */
5303 } /* End of loop for trying multiple hosts. */
5305 /* If we failed to find a matching host in the list, for an already-open
5306 connection, just close it and start over with the list. This can happen
5307 for routing that changes from run to run, or big multi-IP sites with
5310 if (continue_hostname && !continue_host_tried)
5312 int fd = cutthrough.cctx.sock >= 0 ? cutthrough.cctx.sock : 0;
5314 DEBUG(D_transport) debug_printf("no hosts match already-open connection\n");
5316 /* A TLS conn could be open for a cutthrough, but not for a plain continued-
5318 /*XXX doublecheck that! */
5320 if (cutthrough.cctx.sock >= 0 && cutthrough.is_tls)
5322 (void) tls_write(cutthrough.cctx.tls_ctx, US"QUIT\r\n", 6, FALSE);
5323 tls_close(cutthrough.cctx.tls_ctx, TLS_SHUTDOWN_NOWAIT);
5324 cutthrough.cctx.tls_ctx = NULL;
5325 cutthrough.is_tls = FALSE;
5329 (void) write(fd, US"QUIT\r\n", 6);
5332 cutthrough.cctx.sock = -1;
5333 continue_hostname = NULL;
5334 goto retry_non_continued;
5337 /* This is the end of the loop that repeats iff expired is TRUE and
5338 ob->delay_after_cutoff is FALSE. The second time round we will
5339 try those hosts that haven't been tried since the message arrived. */
5343 debug_printf("all IP addresses skipped or deferred at least one address\n");
5344 if (expired && !ob->delay_after_cutoff && cutoff_retry == 0)
5345 debug_printf("retrying IP addresses not tried since message arrived\n");
5350 /* Get here if all IP addresses are skipped or defer at least one address. In
5351 MUA wrapper mode, this will happen only for connection or other non-message-
5352 specific failures. Force the delivery status for all addresses to FAIL. */
5356 for (address_item * addr = addrlist; addr; addr = addr->next)
5357 addr->transport_return = FAIL;
5361 /* In the normal, non-wrapper case, add a standard message to each deferred
5362 address if there hasn't been an error, that is, if it hasn't actually been
5363 tried this time. The variable "expired" will be FALSE if any deliveries were
5364 actually tried, or if there was at least one host that was not expired. That
5365 is, it is TRUE only if no deliveries were tried and all hosts were expired. If
5366 a delivery has been tried, an error code will be set, and the failing of the
5367 message is handled by the retry code later.
5369 If queue_smtp is set, or this transport was called to send a subsequent message
5370 down an existing TCP/IP connection, and something caused the host not to be
5371 found, we end up here, but can detect these cases and handle them specially. */
5373 for (address_item * addr = addrlist; addr; addr = addr->next)
5375 /* If host is not NULL, it means that we stopped processing the host list
5376 because of hosts_max_try or hosts_max_try_hardlimit. In the former case, this
5377 means we need to behave as if some hosts were skipped because their retry
5378 time had not come. Specifically, this prevents the address from timing out.
5379 However, if we have hit hosts_max_try_hardlimit, we want to behave as if all
5380 hosts were tried. */
5383 if (total_hosts_tried >= ob->hosts_max_try_hardlimit)
5386 debug_printf("hosts_max_try_hardlimit reached: behave as if all "
5387 "hosts were tried\n");
5392 debug_printf("hosts_max_try limit caused some hosts to be skipped\n");
5393 setflag(addr, af_retry_skipped);
5396 if (f.queue_smtp) /* no deliveries attempted */
5398 addr->transport_return = DEFER;
5399 addr->basic_errno = 0;
5400 addr->message = US"SMTP delivery explicitly queued";
5403 else if ( addr->transport_return == DEFER
5404 && (addr->basic_errno == ERRNO_UNKNOWNERROR || addr->basic_errno == 0)
5408 addr->basic_errno = ERRNO_HRETRY;
5409 if (continue_hostname)
5410 addr->message = US"no host found for existing SMTP connection";
5413 setflag(addr, af_pass_message); /* This is not a security risk */
5414 addr->message = string_sprintf(
5415 "all hosts%s have been failing for a long time %s",
5416 addr->domain ? string_sprintf(" for '%s'", addr->domain) : US"",
5417 ob->delay_after_cutoff
5418 ? US"(and retry time not reached)"
5419 : US"and were last tried after this message arrived");
5421 /* If we are already using fallback hosts, or there are no fallback hosts
5422 defined, convert the result to FAIL to cause a bounce. */
5424 if (addr->host_list == addr->fallback_hosts || !addr->fallback_hosts)
5425 addr->transport_return = FAIL;
5430 if (hosts_retry == hosts_total)
5431 s = "retry time not reached for any host%s";
5432 else if (hosts_fail == hosts_total)
5433 s = "all host address lookups%s failed permanently";
5434 else if (hosts_defer == hosts_total)
5435 s = "all host address lookups%s failed temporarily";
5436 else if (hosts_serial == hosts_total)
5437 s = "connection limit reached for all hosts%s";
5438 else if (hosts_fail+hosts_defer == hosts_total)
5439 s = "all host address lookups%s failed";
5441 s = "some host address lookups failed and retry time "
5442 "not reached for other hosts or connection limit reached%s";
5444 addr->message = string_sprintf(s,
5445 addr->domain ? string_sprintf(" for '%s'", addr->domain) : US"");
5450 /* Update the database which keeps information about which messages are waiting
5451 for which hosts to become available. For some message-specific errors, the
5452 update_waiting flag is turned off because we don't want follow-on deliveries in
5453 those cases. If this transport instance is explicitly limited to one message
5454 per connection then follow-on deliveries are not possible and there's no need
5455 to create/update the per-transport wait-<transport_name> database. */
5457 if (update_waiting && tblock->connection_max_messages != 1)
5458 transport_update_waiting(hostlist, tblock->name);
5462 DEBUG(D_transport) debug_printf("Leaving %s transport\n", tblock->name);
5464 return TRUE; /* Each address has its status */
5467 #endif /*!MACRO_PREDEF*/
5470 /* End of transport/smtp.c */