1 /*************************************************
2 * Exim - an Internet mail transport agent *
3 *************************************************/
5 /* Copyright (c) University of Cambridge 1995 - 2018 */
6 /* Copyright (c) The Exim Maintainers 2020 */
7 /* See the file NOTICE for conditions of use and distribution. */
12 #if defined(SUPPORT_DANE) && defined(DISABLE_TLS)
13 # error TLS is required for DANE
17 /* Options specific to the smtp transport. This transport also supports LMTP
18 over TCP/IP. The options must be in alphabetic order (note that "_" comes
19 before the lower case letters). Some live in the transport_instance block so as
20 to be publicly visible; these are flagged with opt_public. */
22 #define LOFF(field) OPT_OFF(smtp_transport_options_block, field)
24 optionlist smtp_transport_options[] = {
25 { "*expand_multi_domain", opt_stringptr | opt_hidden | opt_public,
26 OPT_OFF(transport_instance, expand_multi_domain) },
27 { "*expand_retry_include_ip_address", opt_stringptr | opt_hidden,
28 LOFF(expand_retry_include_ip_address) },
30 { "address_retry_include_sender", opt_bool,
31 LOFF(address_retry_include_sender) },
32 { "allow_localhost", opt_bool, LOFF(allow_localhost) },
33 #ifdef EXPERIMENTAL_ARC
34 { "arc_sign", opt_stringptr, LOFF(arc_sign) },
36 { "authenticated_sender", opt_stringptr, LOFF(authenticated_sender) },
37 { "authenticated_sender_force", opt_bool, LOFF(authenticated_sender_force) },
38 { "command_timeout", opt_time, LOFF(command_timeout) },
39 { "connect_timeout", opt_time, LOFF(connect_timeout) },
40 { "connection_max_messages", opt_int | opt_public,
41 OPT_OFF(transport_instance, connection_max_messages) },
43 { "dane_require_tls_ciphers", opt_stringptr, LOFF(dane_require_tls_ciphers) },
45 { "data_timeout", opt_time, LOFF(data_timeout) },
46 { "delay_after_cutoff", opt_bool, LOFF(delay_after_cutoff) },
48 { "dkim_canon", opt_stringptr, LOFF(dkim.dkim_canon) },
49 { "dkim_domain", opt_stringptr, LOFF(dkim.dkim_domain) },
50 { "dkim_hash", opt_stringptr, LOFF(dkim.dkim_hash) },
51 { "dkim_identity", opt_stringptr, LOFF(dkim.dkim_identity) },
52 { "dkim_private_key", opt_stringptr, LOFF(dkim.dkim_private_key) },
53 { "dkim_selector", opt_stringptr, LOFF(dkim.dkim_selector) },
54 { "dkim_sign_headers", opt_stringptr, LOFF(dkim.dkim_sign_headers) },
55 { "dkim_strict", opt_stringptr, LOFF(dkim.dkim_strict) },
56 { "dkim_timestamps", opt_stringptr, LOFF(dkim.dkim_timestamps) },
58 { "dns_qualify_single", opt_bool, LOFF(dns_qualify_single) },
59 { "dns_search_parents", opt_bool, LOFF(dns_search_parents) },
60 { "dnssec_request_domains", opt_stringptr, LOFF(dnssec.request) },
61 { "dnssec_require_domains", opt_stringptr, LOFF(dnssec.require) },
62 { "dscp", opt_stringptr, LOFF(dscp) },
63 { "fallback_hosts", opt_stringptr, LOFF(fallback_hosts) },
64 { "final_timeout", opt_time, LOFF(final_timeout) },
65 { "gethostbyname", opt_bool, LOFF(gethostbyname) },
66 { "helo_data", opt_stringptr, LOFF(helo_data) },
67 { "hosts", opt_stringptr, LOFF(hosts) },
68 { "hosts_avoid_esmtp", opt_stringptr, LOFF(hosts_avoid_esmtp) },
69 { "hosts_avoid_pipelining", opt_stringptr, LOFF(hosts_avoid_pipelining) },
71 { "hosts_avoid_tls", opt_stringptr, LOFF(hosts_avoid_tls) },
73 { "hosts_max_try", opt_int, LOFF(hosts_max_try) },
74 { "hosts_max_try_hardlimit", opt_int, LOFF(hosts_max_try_hardlimit) },
76 { "hosts_nopass_tls", opt_stringptr, LOFF(hosts_nopass_tls) },
77 { "hosts_noproxy_tls", opt_stringptr, LOFF(hosts_noproxy_tls) },
79 { "hosts_override", opt_bool, LOFF(hosts_override) },
80 #ifndef DISABLE_PIPE_CONNECT
81 { "hosts_pipe_connect", opt_stringptr, LOFF(hosts_pipe_connect) },
83 { "hosts_randomize", opt_bool, LOFF(hosts_randomize) },
84 #if !defined(DISABLE_TLS) && !defined(DISABLE_OCSP)
85 { "hosts_request_ocsp", opt_stringptr, LOFF(hosts_request_ocsp) },
87 { "hosts_require_auth", opt_stringptr, LOFF(hosts_require_auth) },
90 { "hosts_require_dane", opt_stringptr, LOFF(hosts_require_dane) },
93 { "hosts_require_ocsp", opt_stringptr, LOFF(hosts_require_ocsp) },
95 { "hosts_require_tls", opt_stringptr, LOFF(hosts_require_tls) },
97 { "hosts_try_auth", opt_stringptr, LOFF(hosts_try_auth) },
98 { "hosts_try_chunking", opt_stringptr, LOFF(hosts_try_chunking) },
100 { "hosts_try_dane", opt_stringptr, LOFF(hosts_try_dane) },
102 { "hosts_try_fastopen", opt_stringptr, LOFF(hosts_try_fastopen) },
104 { "hosts_try_prdr", opt_stringptr, LOFF(hosts_try_prdr) },
107 { "hosts_verify_avoid_tls", opt_stringptr, LOFF(hosts_verify_avoid_tls) },
109 { "interface", opt_stringptr, LOFF(interface) },
110 { "keepalive", opt_bool, LOFF(keepalive) },
111 { "lmtp_ignore_quota", opt_bool, LOFF(lmtp_ignore_quota) },
112 { "max_rcpt", opt_int | opt_public,
113 OPT_OFF(transport_instance, max_addresses) },
114 { "multi_domain", opt_expand_bool | opt_public,
115 OPT_OFF(transport_instance, multi_domain) },
116 { "port", opt_stringptr, LOFF(port) },
117 { "protocol", opt_stringptr, LOFF(protocol) },
118 { "retry_include_ip_address", opt_expand_bool, LOFF(retry_include_ip_address) },
119 { "serialize_hosts", opt_stringptr, LOFF(serialize_hosts) },
120 { "size_addition", opt_int, LOFF(size_addition) },
122 { "socks_proxy", opt_stringptr, LOFF(socks_proxy) },
125 { "tls_certificate", opt_stringptr, LOFF(tls_certificate) },
126 { "tls_crl", opt_stringptr, LOFF(tls_crl) },
127 { "tls_dh_min_bits", opt_int, LOFF(tls_dh_min_bits) },
128 { "tls_privatekey", opt_stringptr, LOFF(tls_privatekey) },
129 { "tls_require_ciphers", opt_stringptr, LOFF(tls_require_ciphers) },
130 # ifdef EXPERIMENTAL_TLS_RESUME
131 { "tls_resumption_hosts", opt_stringptr, LOFF(tls_resumption_hosts) },
133 { "tls_sni", opt_stringptr, LOFF(tls_sni) },
134 { "tls_tempfail_tryclear", opt_bool, LOFF(tls_tempfail_tryclear) },
135 { "tls_try_verify_hosts", opt_stringptr, LOFF(tls_try_verify_hosts) },
136 { "tls_verify_cert_hostnames", opt_stringptr, LOFF(tls_verify_cert_hostnames)},
137 { "tls_verify_certificates", opt_stringptr, LOFF(tls_verify_certificates) },
138 { "tls_verify_hosts", opt_stringptr, LOFF(tls_verify_hosts) },
141 { "utf8_downconvert", opt_stringptr, LOFF(utf8_downconvert) },
145 /* Size of the options list. An extern variable has to be used so that its
146 address can appear in the tables drtables.c. */
148 int smtp_transport_options_count = nelem(smtp_transport_options);
154 smtp_transport_options_block smtp_transport_option_defaults = {0};
155 void smtp_transport_init(transport_instance *tblock) {}
156 BOOL smtp_transport_entry(transport_instance *tblock, address_item *addr) {return FALSE;}
157 void smtp_transport_closedown(transport_instance *tblock) {}
159 #else /*!MACRO_PREDEF*/
162 /* Default private options block for the smtp transport. */
164 smtp_transport_options_block smtp_transport_option_defaults = {
166 .fallback_hosts = NULL,
168 .fallback_hostlist = NULL,
169 .helo_data = US"$primary_hostname",
172 .protocol = US"smtp",
174 .serialize_hosts = NULL,
175 .hosts_try_auth = NULL,
176 .hosts_require_auth = NULL,
177 .hosts_try_chunking = US"*",
179 .hosts_try_dane = US"*",
180 .hosts_require_dane = NULL,
181 .dane_require_tls_ciphers = NULL,
183 .hosts_try_fastopen = US"*",
185 .hosts_try_prdr = US"*",
188 .hosts_request_ocsp = US"*", /* hosts_request_ocsp (except under DANE; tls_client_start()) */
189 .hosts_require_ocsp = NULL,
191 .hosts_require_tls = NULL,
192 .hosts_avoid_tls = NULL,
193 .hosts_verify_avoid_tls = NULL,
194 .hosts_avoid_pipelining = NULL,
195 #ifndef DISABLE_PIPE_CONNECT
196 .hosts_pipe_connect = NULL,
198 .hosts_avoid_esmtp = NULL,
200 .hosts_nopass_tls = NULL,
201 .hosts_noproxy_tls = NULL,
203 .command_timeout = 5*60,
204 .connect_timeout = 5*60,
205 .data_timeout = 5*60,
206 .final_timeout = 10*60,
207 .size_addition = 1024,
209 .hosts_max_try_hardlimit = 50,
210 .address_retry_include_sender = TRUE,
211 .allow_localhost = FALSE,
212 .authenticated_sender_force = FALSE,
213 .gethostbyname = FALSE,
214 .dns_qualify_single = TRUE,
215 .dns_search_parents = FALSE,
216 .dnssec = { .request= US"*", .require=NULL },
217 .delay_after_cutoff = TRUE,
218 .hosts_override = FALSE,
219 .hosts_randomize = FALSE,
221 .lmtp_ignore_quota = FALSE,
222 .expand_retry_include_ip_address = NULL,
223 .retry_include_ip_address = TRUE,
228 .tls_certificate = NULL,
230 .tls_privatekey = NULL,
231 .tls_require_ciphers = NULL,
233 .tls_verify_certificates = US"system",
234 .tls_dh_min_bits = EXIM_CLIENT_DH_DEFAULT_MIN_BITS,
235 .tls_tempfail_tryclear = TRUE,
236 # ifdef EXPERIMENTAL_TLS_RESUME
237 .tls_resumption_hosts = NULL,
239 .tls_verify_hosts = NULL,
240 .tls_try_verify_hosts = US"*",
241 .tls_verify_cert_hostnames = US"*",
244 .utf8_downconvert = US"-1",
248 {.dkim_domain = NULL,
249 .dkim_identity = NULL,
250 .dkim_private_key = NULL,
251 .dkim_selector = NULL,
253 .dkim_sign_headers = NULL,
255 .dkim_hash = US"sha256",
256 .dkim_timestamps = NULL,
257 .dot_stuffed = FALSE,
258 .force_bodyhash = FALSE,
259 # ifdef EXPERIMENTAL_ARC
260 .arc_signspec = NULL,
263 # ifdef EXPERIMENTAL_ARC
269 /* some DSN flags for use later */
271 static int rf_list[] = {rf_notify_never, rf_notify_success,
272 rf_notify_failure, rf_notify_delay };
274 static uschar *rf_names[] = { US"NEVER", US"SUCCESS", US"FAILURE", US"DELAY" };
280 static uschar *smtp_command; /* Points to last cmd for error messages */
281 static uschar *mail_command; /* Points to MAIL cmd for error messages */
282 static uschar *data_command = US""; /* Points to DATA cmd for error messages */
283 static BOOL update_waiting; /* TRUE to update the "wait" database */
285 /*XXX move to smtp_context */
286 static BOOL pipelining_active; /* current transaction is in pipe mode */
289 static unsigned ehlo_response(uschar * buf, unsigned checks);
292 /******************************************************************************/
295 smtp_deliver_init(void)
297 if (!regex_PIPELINING) regex_PIPELINING =
298 regex_must_compile(US"\\n250[\\s\\-]PIPELINING(\\s|\\n|$)", FALSE, TRUE);
300 if (!regex_SIZE) regex_SIZE =
301 regex_must_compile(US"\\n250[\\s\\-]SIZE(\\s|\\n|$)", FALSE, TRUE);
303 if (!regex_AUTH) regex_AUTH =
304 regex_must_compile(AUTHS_REGEX, FALSE, TRUE);
307 if (!regex_STARTTLS) regex_STARTTLS =
308 regex_must_compile(US"\\n250[\\s\\-]STARTTLS(\\s|\\n|$)", FALSE, TRUE);
311 if (!regex_CHUNKING) regex_CHUNKING =
312 regex_must_compile(US"\\n250[\\s\\-]CHUNKING(\\s|\\n|$)", FALSE, TRUE);
315 if (!regex_PRDR) regex_PRDR =
316 regex_must_compile(US"\\n250[\\s\\-]PRDR(\\s|\\n|$)", FALSE, TRUE);
320 if (!regex_UTF8) regex_UTF8 =
321 regex_must_compile(US"\\n250[\\s\\-]SMTPUTF8(\\s|\\n|$)", FALSE, TRUE);
324 if (!regex_DSN) regex_DSN =
325 regex_must_compile(US"\\n250[\\s\\-]DSN(\\s|\\n|$)", FALSE, TRUE);
327 if (!regex_IGNOREQUOTA) regex_IGNOREQUOTA =
328 regex_must_compile(US"\\n250[\\s\\-]IGNOREQUOTA(\\s|\\n|$)", FALSE, TRUE);
330 #ifndef DISABLE_PIPE_CONNECT
331 if (!regex_EARLY_PIPE) regex_EARLY_PIPE =
332 regex_must_compile(US"\\n250[\\s\\-]" EARLY_PIPE_FEATURE_NAME "(\\s|\\n|$)", FALSE, TRUE);
337 /*************************************************
338 * Setup entry point *
339 *************************************************/
341 /* This function is called when the transport is about to be used,
342 but before running it in a sub-process. It is used for two things:
344 (1) To set the fallback host list in addresses, when delivering.
345 (2) To pass back the interface, port, protocol, and other options, for use
346 during callout verification.
349 tblock pointer to the transport instance block
350 addrlist list of addresses about to be transported
351 tf if not NULL, pointer to block in which to return options
352 uid the uid that will be set (not used)
353 gid the gid that will be set (not used)
354 errmsg place for error message (not used)
356 Returns: OK always (FAIL, DEFER not used)
360 smtp_transport_setup(transport_instance *tblock, address_item *addrlist,
361 transport_feedback *tf, uid_t uid, gid_t gid, uschar **errmsg)
363 smtp_transport_options_block *ob = SOB tblock->options_block;
365 errmsg = errmsg; /* Keep picky compilers happy */
369 /* Pass back options if required. This interface is getting very messy. */
373 tf->interface = ob->interface;
375 tf->protocol = ob->protocol;
376 tf->hosts = ob->hosts;
377 tf->hosts_override = ob->hosts_override;
378 tf->hosts_randomize = ob->hosts_randomize;
379 tf->gethostbyname = ob->gethostbyname;
380 tf->qualify_single = ob->dns_qualify_single;
381 tf->search_parents = ob->dns_search_parents;
382 tf->helo_data = ob->helo_data;
385 /* Set the fallback host list for all the addresses that don't have fallback
386 host lists, provided that the local host wasn't present in the original host
389 if (!testflag(addrlist, af_local_host_removed))
390 for (; addrlist; addrlist = addrlist->next)
391 if (!addrlist->fallback_hosts) addrlist->fallback_hosts = ob->fallback_hostlist;
398 /*************************************************
399 * Initialization entry point *
400 *************************************************/
402 /* Called for each instance, after its options have been read, to
403 enable consistency checks to be done, or anything else that needs
406 Argument: pointer to the transport instance block
411 smtp_transport_init(transport_instance *tblock)
413 smtp_transport_options_block *ob = SOB tblock->options_block;
415 /* Retry_use_local_part defaults FALSE if unset */
417 if (tblock->retry_use_local_part == TRUE_UNSET)
418 tblock->retry_use_local_part = FALSE;
420 /* Set the default port according to the protocol */
423 ob->port = strcmpic(ob->protocol, US"lmtp") == 0
425 : strcmpic(ob->protocol, US"smtps") == 0
426 ? US"smtps" : US"smtp";
428 /* Set up the setup entry point, to be called before subprocesses for this
431 tblock->setup = smtp_transport_setup;
433 /* Complain if any of the timeouts are zero. */
435 if (ob->command_timeout <= 0 || ob->data_timeout <= 0 ||
436 ob->final_timeout <= 0)
437 log_write(0, LOG_PANIC_DIE|LOG_CONFIG,
438 "command, data, or final timeout value is zero for %s transport",
441 /* If hosts_override is set and there are local hosts, set the global
442 flag that stops verify from showing router hosts. */
444 if (ob->hosts_override && ob->hosts != NULL) tblock->overrides_hosts = TRUE;
446 /* If there are any fallback hosts listed, build a chain of host items
447 for them, but do not do any lookups at this time. */
449 host_build_hostlist(&(ob->fallback_hostlist), ob->fallback_hosts, FALSE);
456 /*************************************************
457 * Set delivery info into all active addresses *
458 *************************************************/
460 /* Only addresses whose status is >= PENDING are relevant. A lesser
461 status means that an address is not currently being processed.
464 addrlist points to a chain of addresses
465 errno_value to put in each address's errno field
466 msg to put in each address's message field
467 rc to put in each address's transport_return field
468 pass_message if TRUE, set the "pass message" flag in the address
469 host if set, mark addrs as having used this host
470 smtp_greeting from peer
471 helo_response from peer
472 start points to timestamp of delivery start
474 If errno_value has the special value ERRNO_CONNECTTIMEOUT, ETIMEDOUT is put in
475 the errno field, and RTEF_CTOUT is ORed into the more_errno field, to indicate
476 this particular type of timeout.
482 set_errno(address_item *addrlist, int errno_value, uschar *msg, int rc,
483 BOOL pass_message, host_item * host,
484 #ifdef EXPERIMENTAL_DSN_INFO
485 const uschar * smtp_greeting, const uschar * helo_response,
487 struct timeval * start
491 struct timeval deliver_time;
493 if (errno_value == ERRNO_CONNECTTIMEOUT)
495 errno_value = ETIMEDOUT;
496 orvalue = RTEF_CTOUT;
498 timesince(&deliver_time, start);
500 for (address_item * addr = addrlist; addr; addr = addr->next)
501 if (addr->transport_return >= PENDING)
503 addr->basic_errno = errno_value;
504 addr->more_errno |= orvalue;
505 addr->delivery_time = deliver_time;
509 if (pass_message) setflag(addr, af_pass_message);
511 addr->transport_return = rc;
514 addr->host_used = host;
515 #ifdef EXPERIMENTAL_DSN_INFO
517 {uschar * s = Ustrchr(smtp_greeting, '\n'); if (s) *s = '\0';}
518 addr->smtp_greeting = smtp_greeting;
521 {uschar * s = Ustrchr(helo_response, '\n'); if (s) *s = '\0';}
522 addr->helo_response = helo_response;
529 set_errno_nohost(address_item * addrlist, int errno_value, uschar * msg, int rc,
530 BOOL pass_message, struct timeval * start)
532 set_errno(addrlist, errno_value, msg, rc, pass_message, NULL,
533 #ifdef EXPERIMENTAL_DSN_INFO
540 /*************************************************
541 * Check an SMTP response *
542 *************************************************/
544 /* This function is given an errno code and the SMTP response buffer
545 to analyse, together with the host identification for generating messages. It
546 sets an appropriate message and puts the first digit of the response code into
547 the yield variable. If no response was actually read, a suitable digit is
551 host the current host, to get its name for messages
552 errno_value pointer to the errno value
553 more_errno from the top address for use with ERRNO_FILTER_FAIL
554 buffer the SMTP response buffer
555 yield where to put a one-digit SMTP response code
556 message where to put an error message
557 pass_message set TRUE if message is an SMTP response
559 Returns: TRUE if an SMTP "QUIT" command should be sent, else FALSE
563 check_response(host_item *host, int *errno_value, int more_errno,
564 uschar *buffer, int *yield, uschar **message, BOOL *pass_message)
566 uschar * pl = pipelining_active ? US"pipelined " : US"";
569 *yield = '4'; /* Default setting is to give a temporary error */
573 case ETIMEDOUT: /* Handle response timeout */
574 *message = US string_sprintf("SMTP timeout after %s%s",
576 if (transport_count > 0)
577 *message = US string_sprintf("%s (%d bytes written)", *message,
581 case ERRNO_SMTPFORMAT: /* Handle malformed SMTP response */
582 s = string_printing(buffer);
583 while (isspace(*s)) s++;
585 ? string_sprintf("Malformed SMTP reply (an empty line) "
586 "in response to %s%s", pl, smtp_command)
587 : string_sprintf("Malformed SMTP reply in response to %s%s: %s",
588 pl, smtp_command, s);
591 case ERRNO_TLSFAILURE: /* Handle bad first read; can happen with
593 *message = US"bad first read from TLS conn";
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 = US"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
714 deferred_event_raise(address_item * addr, host_item * host, uschar * evstr)
716 uschar * action = addr->transport->event_action;
717 const uschar * save_domain;
723 save_domain = deliver_domain;
724 save_local = deliver_localpart;
726 /*XXX would ip & port already be set up? */
727 deliver_host_address = string_copy(host->address);
728 deliver_host_port = host->port == PORT_NONE ? 25 : host->port;
729 event_defer_errno = addr->basic_errno;
731 router_name = addr->router->name;
732 transport_name = addr->transport->name;
733 deliver_domain = addr->domain;
734 deliver_localpart = addr->local_part;
736 (void) event_raise(action, evstr,
738 ? addr->basic_errno > 0
739 ? string_sprintf("%s: %s", addr->message, strerror(addr->basic_errno))
740 : string_copy(addr->message)
741 : addr->basic_errno > 0
742 ? string_copy(US strerror(addr->basic_errno))
745 deliver_localpart = save_local;
746 deliver_domain = save_domain;
747 router_name = transport_name = NULL;
751 /*************************************************
752 * Reap SMTP specific responses *
753 *************************************************/
755 smtp_discard_responses(smtp_context * sx, smtp_transport_options_block * ob,
758 uschar flushbuffer[4096];
762 if (!smtp_read_response(sx, flushbuffer, sizeof(flushbuffer),
763 '2', ob->command_timeout)
764 && (errno != 0 || flushbuffer[0] == 0))
771 /* Return boolean success */
774 smtp_reap_banner(smtp_context * sx)
776 BOOL good_response = smtp_read_response(sx, sx->buffer, sizeof(sx->buffer),
777 '2', (SOB sx->conn_args.ob)->command_timeout);
778 #ifdef EXPERIMENTAL_DSN_INFO
779 sx->smtp_greeting = string_copy(sx->buffer);
781 return good_response;
785 smtp_reap_ehlo(smtp_context * sx)
787 if (!smtp_read_response(sx, sx->buffer, sizeof(sx->buffer), '2',
788 (SOB sx->conn_args.ob)->command_timeout))
790 if (errno != 0 || sx->buffer[0] == 0 || sx->lmtp)
792 #ifdef EXPERIMENTAL_DSN_INFO
793 sx->helo_response = string_copy(sx->buffer);
799 #ifdef EXPERIMENTAL_DSN_INFO
800 sx->helo_response = string_copy(sx->buffer);
802 #ifndef DISABLE_EVENT
803 (void) event_raise(sx->conn_args.tblock->event_action,
804 US"smtp:ehlo", sx->buffer);
811 #ifndef DISABLE_PIPE_CONNECT
813 ehlo_cache_key(const smtp_context * sx)
815 host_item * host = sx->conn_args.host;
816 return Ustrchr(host->address, ':')
817 ? string_sprintf("[%s]:%d.EHLO", host->address,
818 host->port == PORT_NONE ? sx->port : host->port)
819 : string_sprintf("%s:%d.EHLO", host->address,
820 host->port == PORT_NONE ? sx->port : host->port);
824 write_ehlo_cache_entry(const smtp_context * sx)
826 open_db dbblock, * dbm_file;
828 if ((dbm_file = dbfn_open(US"misc", O_RDWR, &dbblock, TRUE, TRUE)))
830 uschar * ehlo_resp_key = ehlo_cache_key(sx);
831 dbdata_ehlo_resp er = { .data = sx->ehlo_resp };
833 HDEBUG(D_transport) debug_printf("writing clr %04x/%04x cry %04x/%04x\n",
834 sx->ehlo_resp.cleartext_features, sx->ehlo_resp.cleartext_auths,
835 sx->ehlo_resp.crypted_features, sx->ehlo_resp.crypted_auths);
837 dbfn_write(dbm_file, ehlo_resp_key, &er, (int)sizeof(er));
838 dbfn_close(dbm_file);
843 invalidate_ehlo_cache_entry(smtp_context * sx)
845 open_db dbblock, * dbm_file;
847 if ( sx->early_pipe_active
848 && (dbm_file = dbfn_open(US"misc", O_RDWR, &dbblock, TRUE, TRUE)))
850 uschar * ehlo_resp_key = ehlo_cache_key(sx);
851 dbfn_delete(dbm_file, ehlo_resp_key);
852 dbfn_close(dbm_file);
857 read_ehlo_cache_entry(smtp_context * sx)
862 if (!(dbm_file = dbfn_open(US"misc", O_RDONLY, &dbblock, FALSE, TRUE)))
863 { DEBUG(D_transport) debug_printf("ehlo-cache: no misc DB\n"); }
866 uschar * ehlo_resp_key = ehlo_cache_key(sx);
867 dbdata_ehlo_resp * er;
869 if (!(er = dbfn_read(dbm_file, ehlo_resp_key)))
870 { DEBUG(D_transport) debug_printf("no ehlo-resp record\n"); }
871 else if (time(NULL) - er->time_stamp > retry_data_expire)
873 DEBUG(D_transport) debug_printf("ehlo-resp record too old\n");
874 dbfn_close(dbm_file);
875 if ((dbm_file = dbfn_open(US"misc", O_RDWR, &dbblock, TRUE, TRUE)))
876 dbfn_delete(dbm_file, ehlo_resp_key);
880 sx->ehlo_resp = er->data;
881 dbfn_close(dbm_file);
882 DEBUG(D_transport) debug_printf(
883 "EHLO response bits from cache: cleartext 0x%04x/0x%04x crypted 0x%04x/0x%04x\n",
884 er->data.cleartext_features, er->data.cleartext_auths,
885 er->data.crypted_features, er->data.crypted_auths);
888 dbfn_close(dbm_file);
895 /* Return an auths bitmap for the set of AUTH methods offered by the server
896 which match our authenticators. */
898 static unsigned short
899 study_ehlo_auths(smtp_context * sx)
904 unsigned short authbits = 0;
906 if (!sx->esmtp) return 0;
907 if (!regex_AUTH) regex_AUTH = regex_must_compile(AUTHS_REGEX, FALSE, TRUE);
908 if (!regex_match_and_setup(regex_AUTH, sx->buffer, 0, -1)) return 0;
909 expand_nmax = -1; /* reset */
910 names = string_copyn(expand_nstring[1], expand_nlength[1]);
912 for (au = auths, authnum = 0; au; au = au->next, authnum++) if (au->client)
914 const uschar * list = names;
916 for (int sep = ' '; s = string_nextinlist(&list, &sep, NULL, 0); )
917 if (strcmpic(au->public_name, s) == 0)
918 { authbits |= BIT(authnum); break; }
922 debug_printf("server offers %s AUTH, methods '%s', bitmap 0x%04x\n",
923 tls_out.active.sock >= 0 ? "crypted" : "plaintext", names, authbits);
925 if (tls_out.active.sock >= 0)
926 sx->ehlo_resp.crypted_auths = authbits;
928 sx->ehlo_resp.cleartext_auths = authbits;
935 /* Wait for and check responses for early-pipelining.
937 Called from the lower-level smtp_read_response() function
938 used for general code that assume synchronisation, if context
939 flags indicate outstanding early-pipelining commands. Also
940 called fom sync_responses() which handles pipelined commands.
943 sx smtp connection context
944 countp number of outstanding responses, adjusted on return
948 DEFER error on first read of TLS'd conn
949 FAIL SMTP error in response
952 smtp_reap_early_pipe(smtp_context * sx, int * countp)
954 BOOL pending_BANNER = sx->pending_BANNER;
955 BOOL pending_EHLO = sx->pending_EHLO;
958 sx->pending_BANNER = FALSE; /* clear early to avoid recursion */
959 sx->pending_EHLO = FALSE;
963 DEBUG(D_transport) debug_printf("%s expect banner\n", __FUNCTION__);
965 if (!smtp_reap_banner(sx))
967 DEBUG(D_transport) debug_printf("bad banner\n");
968 if (tls_out.active.sock >= 0) rc = DEFER;
975 unsigned peer_offered;
976 unsigned short authbits = 0, * ap;
978 DEBUG(D_transport) debug_printf("%s expect ehlo\n", __FUNCTION__);
980 if (!smtp_reap_ehlo(sx))
982 DEBUG(D_transport) debug_printf("bad response for EHLO\n");
983 if (tls_out.active.sock >= 0) rc = DEFER;
987 /* Compare the actual EHLO response to the cached value we assumed;
988 on difference, dump or rewrite the cache and arrange for a retry. */
990 ap = tls_out.active.sock < 0
991 ? &sx->ehlo_resp.cleartext_auths : &sx->ehlo_resp.crypted_auths;
993 peer_offered = ehlo_response(sx->buffer,
994 (tls_out.active.sock < 0 ? OPTION_TLS : 0)
995 | OPTION_CHUNKING | OPTION_PRDR | OPTION_DSN | OPTION_PIPE | OPTION_SIZE
996 | OPTION_UTF8 | OPTION_EARLY_PIPE
998 if ( peer_offered != sx->peer_offered
999 || (authbits = study_ehlo_auths(sx)) != *ap)
1002 debug_printf("EHLO %s extensions changed, 0x%04x/0x%04x -> 0x%04x/0x%04x\n",
1003 tls_out.active.sock < 0 ? "cleartext" : "crypted",
1004 sx->peer_offered, *ap, peer_offered, authbits);
1005 *(tls_out.active.sock < 0
1006 ? &sx->ehlo_resp.cleartext_features : &sx->ehlo_resp.crypted_features) = peer_offered;
1008 if (peer_offered & OPTION_EARLY_PIPE)
1009 write_ehlo_cache_entry(sx);
1011 invalidate_ehlo_cache_entry(sx);
1013 return OK; /* just carry on */
1019 invalidate_ehlo_cache_entry(sx);
1020 (void) smtp_discard_responses(sx, sx->conn_args.ob, *countp);
1026 /*************************************************
1027 * Synchronize SMTP responses *
1028 *************************************************/
1030 /* This function is called from smtp_deliver() to receive SMTP responses from
1031 the server, and match them up with the commands to which they relate. When
1032 PIPELINING is not in use, this function is called after every command, and is
1033 therefore somewhat over-engineered, but it is simpler to use a single scheme
1034 that works both with and without PIPELINING instead of having two separate sets
1037 The set of commands that are buffered up with pipelining may start with MAIL
1038 and may end with DATA; in between are RCPT commands that correspond to the
1039 addresses whose status is PENDING_DEFER. All other commands (STARTTLS, AUTH,
1040 etc.) are never buffered.
1042 Errors after MAIL or DATA abort the whole process leaving the response in the
1043 buffer. After MAIL, pending responses are flushed, and the original command is
1044 re-instated in big_buffer for error messages. For RCPT commands, the remote is
1045 permitted to reject some recipient addresses while accepting others. However
1046 certain errors clearly abort the whole process. Set the value in
1047 transport_return to PENDING_OK if the address is accepted. If there is a
1048 subsequent general error, it will get reset accordingly. If not, it will get
1049 converted to OK at the end.
1052 sx smtp connection context
1053 count the number of responses to read
1054 pending_DATA 0 if last command sent was not DATA
1055 +1 if previously had a good recipient
1056 -1 if not previously had a good recipient
1058 Returns: 3 if at least one address had 2xx and one had 5xx
1059 2 if at least one address had 5xx but none had 2xx
1060 1 if at least one host had a 2xx response, but none had 5xx
1061 0 no address had 2xx or 5xx but no errors (all 4xx, or just DATA)
1062 -1 timeout while reading RCPT response
1063 -2 I/O or other non-response error for RCPT
1064 -3 DATA or MAIL failed - errno and buffer set
1065 -4 banner or EHLO failed (early-pipelining)
1066 -5 banner or EHLO failed (early-pipelining, TLS)
1070 sync_responses(smtp_context * sx, int count, int pending_DATA)
1072 address_item * addr = sx->sync_addr;
1073 smtp_transport_options_block * ob = sx->conn_args.ob;
1076 #ifndef DISABLE_PIPE_CONNECT
1078 if ((rc = smtp_reap_early_pipe(sx, &count)) != OK)
1079 return rc == FAIL ? -4 : -5;
1082 /* Handle the response for a MAIL command. On error, reinstate the original
1083 command in big_buffer for error message use, and flush any further pending
1084 responses before returning, except after I/O errors and timeouts. */
1086 if (sx->pending_MAIL)
1088 DEBUG(D_transport) debug_printf("%s expect mail\n", __FUNCTION__);
1090 sx->pending_MAIL = FALSE;
1091 if (!smtp_read_response(sx, sx->buffer, sizeof(sx->buffer),
1092 '2', ob->command_timeout))
1094 DEBUG(D_transport) debug_printf("bad response for MAIL\n");
1095 Ustrcpy(big_buffer, mail_command); /* Fits, because it came from there! */
1096 if (errno == ERRNO_TLSFAILURE)
1098 if (errno == 0 && sx->buffer[0] != 0)
1101 if (sx->buffer[0] == '4')
1103 save_errno = ERRNO_MAIL4XX;
1104 addr->more_errno |= ((sx->buffer[1] - '0')*10 + sx->buffer[2] - '0') << 8;
1106 count = smtp_discard_responses(sx, ob, count);
1110 if (pending_DATA) count--; /* Number of RCPT responses to come */
1111 while (count-- > 0) /* Mark any pending addrs with the host used */
1113 while (addr->transport_return != PENDING_DEFER) addr = addr->next;
1114 addr->host_used = sx->conn_args.host;
1121 if (pending_DATA) count--; /* Number of RCPT responses to come */
1123 /* Read and handle the required number of RCPT responses, matching each one up
1124 with an address by scanning for the next address whose status is PENDING_DEFER.
1129 while (addr->transport_return != PENDING_DEFER)
1130 if (!(addr = addr->next))
1133 /* The address was accepted */
1134 addr->host_used = sx->conn_args.host;
1136 DEBUG(D_transport) debug_printf("%s expect rcpt\n", __FUNCTION__);
1137 if (smtp_read_response(sx, sx->buffer, sizeof(sx->buffer),
1138 '2', ob->command_timeout))
1141 addr->transport_return = PENDING_OK;
1143 /* If af_dr_retry_exists is set, there was a routing delay on this address;
1144 ensure that any address-specific retry record is expunged. We do this both
1145 for the basic key and for the version that also includes the sender. */
1147 if (testflag(addr, af_dr_retry_exists))
1149 uschar *altkey = string_sprintf("%s:<%s>", addr->address_retry_key,
1151 retry_add_item(addr, altkey, rf_delete);
1152 retry_add_item(addr, addr->address_retry_key, rf_delete);
1156 /* Error on first TLS read */
1158 else if (errno == ERRNO_TLSFAILURE)
1161 /* Timeout while reading the response */
1163 else if (errno == ETIMEDOUT)
1165 uschar *message = string_sprintf("SMTP timeout after RCPT TO:<%s>",
1166 transport_rcpt_address(addr, sx->conn_args.tblock->rcpt_include_affixes));
1167 set_errno_nohost(sx->first_addr, ETIMEDOUT, message, DEFER, FALSE, &sx->delivery_start);
1168 retry_add_item(addr, addr->address_retry_key, 0);
1169 update_waiting = FALSE;
1173 /* Handle other errors in obtaining an SMTP response by returning -1. This
1174 will cause all the addresses to be deferred. Restore the SMTP command in
1175 big_buffer for which we are checking the response, so the error message
1178 else if (errno != 0 || sx->buffer[0] == 0)
1180 gstring gs = { .size = big_buffer_size, .ptr = 0, .s = big_buffer }, * g = &gs;
1182 /* Use taint-unchecked routines for writing into big_buffer, trusting
1183 that we'll never expand it. */
1185 g = string_fmt_append_f(g, SVFMT_TAINT_NOCHK, "RCPT TO:<%s>",
1186 transport_rcpt_address(addr, sx->conn_args.tblock->rcpt_include_affixes));
1187 string_from_gstring(g);
1191 /* Handle SMTP permanent and temporary response codes. */
1196 string_sprintf("SMTP error from remote mail server after RCPT TO:<%s>: "
1197 "%s", transport_rcpt_address(addr, sx->conn_args.tblock->rcpt_include_affixes),
1198 string_printing(sx->buffer));
1199 setflag(addr, af_pass_message);
1201 msglog_line(sx->conn_args.host, addr->message);
1203 /* The response was 5xx */
1205 if (sx->buffer[0] == '5')
1207 addr->transport_return = FAIL;
1211 /* The response was 4xx */
1215 addr->transport_return = DEFER;
1216 addr->basic_errno = ERRNO_RCPT4XX;
1217 addr->more_errno |= ((sx->buffer[1] - '0')*10 + sx->buffer[2] - '0') << 8;
1221 #ifndef DISABLE_EVENT
1222 event_defer_errno = addr->more_errno;
1223 msg_event_raise(US"msg:rcpt:host:defer", addr);
1225 /* If a 452 and we've had at least one 2xx or 5xx, set next_addr to the
1226 start point for another MAIL command. */
1228 if (addr->more_errno >> 8 == 52 && yield & 3)
1233 debug_printf("%s: seen first 452 too-many-rcpts\n", __FUNCTION__);
1234 sx->RCPT_452 = TRUE;
1235 sx->next_addr = addr;
1237 addr->transport_return = PENDING_DEFER;
1238 addr->basic_errno = 0;
1242 /* Log temporary errors if there are more hosts to be tried.
1243 If not, log this last one in the == line. */
1245 if (sx->conn_args.host->next)
1246 if (LOGGING(outgoing_port))
1247 log_write(0, LOG_MAIN, "H=%s [%s]:%d %s", sx->conn_args.host->name,
1248 sx->conn_args.host->address,
1249 sx->port == PORT_NONE ? 25 : sx->port, addr->message);
1251 log_write(0, LOG_MAIN, "H=%s [%s]: %s", sx->conn_args.host->name,
1252 sx->conn_args.host->address, addr->message);
1254 #ifndef DISABLE_EVENT
1256 msg_event_raise(US"msg:rcpt:defer", addr);
1259 /* Do not put this message on the list of those waiting for specific
1260 hosts, as otherwise it is likely to be tried too often. */
1262 update_waiting = FALSE;
1264 /* Add a retry item for the address so that it doesn't get tried again
1265 too soon. If address_retry_include_sender is true, add the sender address
1266 to the retry key. */
1268 retry_add_item(addr,
1269 ob->address_retry_include_sender
1270 ? string_sprintf("%s:<%s>", addr->address_retry_key, sender_address)
1271 : addr->address_retry_key,
1277 } /* Loop for next RCPT response */
1279 /* Update where to start at for the next block of responses, unless we
1280 have already handled all the addresses. */
1282 if (addr) sx->sync_addr = addr->next;
1284 /* Handle a response to DATA. If we have not had any good recipients, either
1285 previously or in this block, the response is ignored. */
1287 if (pending_DATA != 0)
1289 DEBUG(D_transport) debug_printf("%s expect data\n", __FUNCTION__);
1290 if (!smtp_read_response(sx, sx->buffer, sizeof(sx->buffer),
1291 '3', ob->command_timeout))
1297 if (errno == ERRNO_TLSFAILURE) /* Error on first TLS read */
1300 if (pending_DATA > 0 || (yield & 1) != 0)
1302 if (errno == 0 && sx->buffer[0] == '4')
1304 errno = ERRNO_DATA4XX;
1305 sx->first_addr->more_errno |= ((sx->buffer[1] - '0')*10 + sx->buffer[2] - '0') << 8;
1309 (void)check_response(sx->conn_args.host, &errno, 0, sx->buffer, &code, &msg, &pass_message);
1310 DEBUG(D_transport) debug_printf("%s\nerror for DATA ignored: pipelining "
1311 "is in use and there were no good recipients\n", msg);
1315 /* All responses read and handled; MAIL (if present) received 2xx and DATA (if
1316 present) received 3xx. If any RCPTs were handled and yielded anything other
1317 than 4xx, yield will be set non-zero. */
1326 /* Try an authenticator's client entry */
1329 try_authenticator(smtp_context * sx, auth_instance * au)
1331 smtp_transport_options_block * ob = sx->conn_args.ob; /* transport options */
1332 host_item * host = sx->conn_args.host; /* host to deliver to */
1335 sx->outblock.authenticating = TRUE;
1336 rc = (au->info->clientcode)(au, sx, ob->command_timeout,
1337 sx->buffer, sizeof(sx->buffer));
1338 sx->outblock.authenticating = FALSE;
1339 DEBUG(D_transport) debug_printf("%s authenticator yielded %d\n", au->name, rc);
1341 /* A temporary authentication failure must hold up delivery to
1342 this host. After a permanent authentication failure, we carry on
1343 to try other authentication methods. If all fail hard, try to
1344 deliver the message unauthenticated unless require_auth was set. */
1349 f.smtp_authenticated = TRUE; /* stops the outer loop */
1350 client_authenticator = au->name;
1351 if (au->set_client_id)
1352 client_authenticated_id = expand_string(au->set_client_id);
1355 /* Failure after writing a command */
1360 /* Failure after reading a response */
1363 if (errno != 0 || sx->buffer[0] != '5') return FAIL;
1364 log_write(0, LOG_MAIN, "%s authenticator failed H=%s [%s] %s",
1365 au->name, host->name, host->address, sx->buffer);
1368 /* Failure by some other means. In effect, the authenticator
1369 decided it wasn't prepared to handle this case. Typically this
1370 is the result of "fail" in an expansion string. Do we need to
1371 log anything here? Feb 2006: a message is now put in the buffer
1372 if logging is required. */
1375 if (*sx->buffer != 0)
1376 log_write(0, LOG_MAIN, "%s authenticator cancelled "
1377 "authentication H=%s [%s] %s", au->name, host->name,
1378 host->address, sx->buffer);
1381 /* Internal problem, message in buffer. */
1384 set_errno_nohost(sx->addrlist, ERRNO_AUTHPROB, string_copy(sx->buffer),
1385 DEFER, FALSE, &sx->delivery_start);
1394 /* Do the client side of smtp-level authentication.
1397 sx smtp connection context
1399 sx->buffer should have the EHLO response from server (gets overwritten)
1402 OK Success, or failed (but not required): global "smtp_authenticated" set
1403 DEFER Failed authentication (and was required)
1404 ERROR Internal problem
1406 FAIL_SEND Failed communications - transmit
1411 smtp_auth(smtp_context * sx)
1413 host_item * host = sx->conn_args.host; /* host to deliver to */
1414 smtp_transport_options_block * ob = sx->conn_args.ob; /* transport options */
1415 int require_auth = verify_check_given_host(CUSS &ob->hosts_require_auth, host);
1416 #ifndef DISABLE_PIPE_CONNECT
1417 unsigned short authbits = tls_out.active.sock >= 0
1418 ? sx->ehlo_resp.crypted_auths : sx->ehlo_resp.cleartext_auths;
1420 uschar * fail_reason = US"server did not advertise AUTH support";
1422 f.smtp_authenticated = FALSE;
1423 client_authenticator = client_authenticated_id = client_authenticated_sender = NULL;
1426 regex_AUTH = regex_must_compile(AUTHS_REGEX, FALSE, TRUE);
1428 /* Is the server offering AUTH? */
1432 #ifndef DISABLE_PIPE_CONNECT
1433 sx->early_pipe_active ? authbits
1436 regex_match_and_setup(regex_AUTH, sx->buffer, 0, -1)
1439 uschar * names = NULL;
1440 expand_nmax = -1; /* reset */
1442 #ifndef DISABLE_PIPE_CONNECT
1443 if (!sx->early_pipe_active)
1445 names = string_copyn(expand_nstring[1], expand_nlength[1]);
1447 /* Must not do this check until after we have saved the result of the
1448 regex match above as the check could be another RE. */
1450 if ( require_auth == OK
1451 || verify_check_given_host(CUSS &ob->hosts_try_auth, host) == OK)
1453 DEBUG(D_transport) debug_printf("scanning authentication mechanisms\n");
1454 fail_reason = US"no common mechanisms were found";
1456 #ifndef DISABLE_PIPE_CONNECT
1457 if (sx->early_pipe_active)
1459 /* Scan our authenticators (which support use by a client and were offered
1460 by the server (checked at cache-write time)), not suppressed by
1461 client_condition. If one is found, attempt to authenticate by calling its
1462 client function. We are limited to supporting up to 16 authenticator
1463 public-names by the number of bits in a short. */
1469 for (bitnum = 0, au = auths;
1470 !f.smtp_authenticated && au && bitnum < 16;
1471 bitnum++, au = au->next) if (authbits & BIT(bitnum))
1473 if ( au->client_condition
1474 && !expand_check_condition(au->client_condition, au->name,
1475 US"client authenticator"))
1477 DEBUG(D_transport) debug_printf("skipping %s authenticator: %s\n",
1478 au->name, "client_condition is false");
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)
1495 /* Scan the configured authenticators looking for one which is configured
1496 for use as a client, which is not suppressed by client_condition, and
1497 whose name matches an authentication mechanism supported by the server.
1498 If one is found, attempt to authenticate by calling its client function.
1501 for (auth_instance * au = auths; !f.smtp_authenticated && au; au = au->next)
1506 || ( au->client_condition
1507 && !expand_check_condition(au->client_condition, au->name,
1508 US"client authenticator")))
1510 DEBUG(D_transport) debug_printf("skipping %s authenticator: %s\n",
1512 (au->client)? "client_condition is false" :
1513 "not configured as a client");
1517 /* Loop to scan supported server mechanisms */
1521 int len = Ustrlen(au->public_name);
1524 while (isspace(*p)) p++;
1526 if (strncmpic(au->public_name, p, len) != 0 ||
1527 (p[len] != 0 && !isspace(p[len])))
1529 while (*p != 0 && !isspace(*p)) p++;
1533 /* Found data for a listed mechanism. Call its client entry. Set
1534 a flag in the outblock so that data is overwritten after sending so
1535 that reflections don't show it. */
1537 fail_reason = US"authentication attempt(s) failed";
1539 if ((rc = try_authenticator(sx, au)) != OK)
1542 break; /* If not authenticated, try next authenticator */
1543 } /* Loop for scanning supported server mechanisms */
1544 } /* Loop for further authenticators */
1548 /* If we haven't authenticated, but are required to, give up. */
1550 if (require_auth == OK && !f.smtp_authenticated)
1552 invalidate_ehlo_cache_entry(sx);
1553 set_errno_nohost(sx->addrlist, ERRNO_AUTHFAIL,
1554 string_sprintf("authentication required but %s", fail_reason), DEFER,
1555 FALSE, &sx->delivery_start);
1563 /* Construct AUTH appendix string for MAIL TO */
1566 sx context for smtp connection
1567 p point in sx->buffer to build string
1568 addrlist chain of potential addresses to deliver
1570 Globals f.smtp_authenticated
1571 client_authenticated_sender
1572 Return True on error, otherwise buffer has (possibly empty) terminated string
1576 smtp_mail_auth_str(smtp_context * sx, uschar * p, address_item * addrlist)
1578 smtp_transport_options_block * ob = sx->conn_args.ob;
1579 uschar * local_authenticated_sender = authenticated_sender;
1582 debug_printf("smtp_mail_auth_str: as<%s> os<%s> SA<%s>\n",
1583 authenticated_sender, ob->authenticated_sender, f.smtp_authenticated?"Y":"N");
1586 if (ob->authenticated_sender)
1588 uschar * new = expand_string(ob->authenticated_sender);
1591 if (!f.expand_string_forcedfail)
1593 uschar *message = string_sprintf("failed to expand "
1594 "authenticated_sender: %s", expand_string_message);
1595 set_errno_nohost(addrlist, ERRNO_EXPANDFAIL, message, DEFER, FALSE, &sx->delivery_start);
1600 local_authenticated_sender = new;
1603 /* Add the authenticated sender address if present */
1605 if ( (f.smtp_authenticated || ob->authenticated_sender_force)
1606 && local_authenticated_sender)
1608 string_format_nt(p, sizeof(sx->buffer) - (p-sx->buffer), " AUTH=%s",
1609 auth_xtextencode(local_authenticated_sender,
1610 Ustrlen(local_authenticated_sender)));
1611 client_authenticated_sender = string_copy(local_authenticated_sender);
1621 typedef struct smtp_compare_s
1623 uschar * current_sender_address;
1624 struct transport_instance * tblock;
1628 /* Create a unique string that identifies this message, it is based on
1629 sender_address, helo_data and tls_certificate if enabled.
1633 smtp_local_identity(uschar * sender, struct transport_instance * tblock)
1635 address_item * addr1;
1636 uschar * if1 = US"";
1637 uschar * helo1 = US"";
1639 uschar * tlsc1 = US"";
1641 uschar * save_sender_address = sender_address;
1642 uschar * local_identity = NULL;
1643 smtp_transport_options_block * ob = SOB tblock->options_block;
1645 sender_address = sender;
1647 addr1 = deliver_make_addr (sender, TRUE);
1648 deliver_set_expansions(addr1);
1651 if1 = expand_string(ob->interface);
1654 helo1 = expand_string(ob->helo_data);
1657 if (ob->tls_certificate)
1658 tlsc1 = expand_string(ob->tls_certificate);
1659 local_identity = string_sprintf ("%s^%s^%s", if1, helo1, tlsc1);
1661 local_identity = string_sprintf ("%s^%s", if1, helo1);
1664 deliver_set_expansions(NULL);
1665 sender_address = save_sender_address;
1667 return local_identity;
1672 /* This routine is a callback that is called from transport_check_waiting.
1673 This function will evaluate the incoming message versus the previous
1674 message. If the incoming message is using a different local identity then
1675 we will veto this new message. */
1678 smtp_are_same_identities(uschar * message_id, smtp_compare_t * s_compare)
1680 uschar * message_local_identity,
1681 * current_local_identity,
1682 * new_sender_address;
1684 current_local_identity =
1685 smtp_local_identity(s_compare->current_sender_address, s_compare->tblock);
1687 if (!(new_sender_address = deliver_get_sender_address(message_id)))
1690 message_local_identity =
1691 smtp_local_identity(new_sender_address, s_compare->tblock);
1693 return Ustrcmp(current_local_identity, message_local_identity) == 0;
1699 ehlo_response(uschar * buf, unsigned checks)
1701 size_t bsize = Ustrlen(buf);
1703 /* debug_printf("%s: check for 0x%04x\n", __FUNCTION__, checks); */
1706 if ( checks & OPTION_TLS
1707 && pcre_exec(regex_STARTTLS, NULL, CS buf, bsize, 0, PCRE_EOPT, NULL, 0) < 0)
1709 checks &= ~OPTION_TLS;
1711 if ( checks & OPTION_IGNQ
1712 && pcre_exec(regex_IGNOREQUOTA, NULL, CS buf, bsize, 0,
1713 PCRE_EOPT, NULL, 0) < 0)
1714 checks &= ~OPTION_IGNQ;
1716 if ( checks & OPTION_CHUNKING
1717 && pcre_exec(regex_CHUNKING, NULL, CS buf, bsize, 0, PCRE_EOPT, NULL, 0) < 0)
1718 checks &= ~OPTION_CHUNKING;
1720 #ifndef DISABLE_PRDR
1721 if ( checks & OPTION_PRDR
1722 && pcre_exec(regex_PRDR, NULL, CS buf, bsize, 0, PCRE_EOPT, NULL, 0) < 0)
1724 checks &= ~OPTION_PRDR;
1727 if ( checks & OPTION_UTF8
1728 && pcre_exec(regex_UTF8, NULL, CS buf, bsize, 0, PCRE_EOPT, NULL, 0) < 0)
1730 checks &= ~OPTION_UTF8;
1732 if ( checks & OPTION_DSN
1733 && pcre_exec(regex_DSN, NULL, CS buf, bsize, 0, PCRE_EOPT, NULL, 0) < 0)
1734 checks &= ~OPTION_DSN;
1736 if ( checks & OPTION_PIPE
1737 && pcre_exec(regex_PIPELINING, NULL, CS buf, bsize, 0,
1738 PCRE_EOPT, NULL, 0) < 0)
1739 checks &= ~OPTION_PIPE;
1741 if ( checks & OPTION_SIZE
1742 && pcre_exec(regex_SIZE, NULL, CS buf, bsize, 0, PCRE_EOPT, NULL, 0) < 0)
1743 checks &= ~OPTION_SIZE;
1745 #ifndef DISABLE_PIPE_CONNECT
1746 if ( checks & OPTION_EARLY_PIPE
1747 && pcre_exec(regex_EARLY_PIPE, NULL, CS buf, bsize, 0,
1748 PCRE_EOPT, NULL, 0) < 0)
1750 checks &= ~OPTION_EARLY_PIPE;
1752 /* debug_printf("%s: found 0x%04x\n", __FUNCTION__, checks); */
1758 /* Callback for emitting a BDAT data chunk header.
1760 If given a nonzero size, first flush any buffered SMTP commands
1761 then emit the command.
1763 Reap previous SMTP command responses if requested, and always reap
1764 the response from a previous BDAT command.
1767 tctx transport context
1768 chunk_size value for SMTP BDAT command
1770 tc_chunk_last add LAST option to SMTP BDAT command
1771 tc_reap_prev reap response to previous SMTP commands
1775 DEFER TLS error on first read (EHLO-resp); errno set
1779 smtp_chunk_cmd_callback(transport_ctx * tctx, unsigned chunk_size,
1782 smtp_transport_options_block * ob = SOB tctx->tblock->options_block;
1783 smtp_context * sx = tctx->smtp_context;
1787 /* Write SMTP chunk header command. If not reaping responses, note that
1788 there may be more writes (like, the chunk data) done soon. */
1792 #ifndef DISABLE_PIPE_CONNECT
1793 BOOL new_conn = !!(sx->outblock.conn_args);
1795 if((cmd_count = smtp_write_command(sx,
1796 flags & tc_reap_prev ? SCMD_FLUSH : SCMD_MORE,
1797 "BDAT %u%s\r\n", chunk_size, flags & tc_chunk_last ? " LAST" : "")
1798 ) < 0) return ERROR;
1799 if (flags & tc_chunk_last)
1800 data_command = string_copy(big_buffer); /* Save for later error message */
1801 #ifndef DISABLE_PIPE_CONNECT
1802 /* That command write could have been the one that made the connection.
1803 Copy the fd from the client conn ctx (smtp transport specific) to the
1804 generic transport ctx. */
1807 tctx->u.fd = sx->outblock.cctx->sock;
1811 prev_cmd_count = cmd_count += sx->cmd_count;
1813 /* Reap responses for any previous, but not one we just emitted */
1817 if (sx->pending_BDAT)
1820 if (flags & tc_reap_prev && prev_cmd_count > 0)
1822 DEBUG(D_transport) debug_printf("look for %d responses"
1823 " for previous pipelined cmds\n", prev_cmd_count);
1825 switch(sync_responses(sx, prev_cmd_count, 0))
1827 case 1: /* 2xx (only) => OK */
1828 case 3: sx->good_RCPT = TRUE; /* 2xx & 5xx => OK & progress made */
1829 case 2: sx->completed_addr = TRUE; /* 5xx (only) => progress made */
1830 case 0: break; /* No 2xx or 5xx, but no probs */
1832 case -5: errno = ERRNO_TLSFAILURE;
1834 #ifndef DISABLE_PIPE_CONNECT
1835 case -4: /* non-2xx for pipelined banner or EHLO */
1837 case -1: /* Timeout on RCPT */
1838 default: return ERROR; /* I/O error, or any MAIL/DATA error */
1841 if (!sx->pending_BDAT)
1842 pipelining_active = FALSE;
1845 /* Reap response for an outstanding BDAT */
1847 if (sx->pending_BDAT)
1849 DEBUG(D_transport) debug_printf("look for one response for BDAT\n");
1851 if (!smtp_read_response(sx, sx->buffer, sizeof(sx->buffer), '2',
1852 ob->command_timeout))
1854 if (errno == 0 && sx->buffer[0] == '4')
1856 errno = ERRNO_DATA4XX; /*XXX does this actually get used? */
1857 sx->addrlist->more_errno |=
1858 ((sx->buffer[1] - '0')*10 + sx->buffer[2] - '0') << 8;
1863 sx->pending_BDAT = FALSE;
1864 pipelining_active = FALSE;
1866 else if (chunk_size > 0)
1867 sx->pending_BDAT = TRUE;
1870 sx->cmd_count = cmd_count;
1878 /*************************************************
1879 * Make connection for given message *
1880 *************************************************/
1884 ctx connection context
1885 suppress_tls if TRUE, don't attempt a TLS connection - this is set for
1886 a second attempt after TLS initialization fails
1888 Returns: OK - the connection was made and the delivery attempted;
1889 fd is set in the conn context, tls_out set up.
1890 DEFER - the connection could not be made, or something failed
1891 while setting up the SMTP session, or there was a
1892 non-message-specific error, such as a timeout.
1893 ERROR - helo_data or add_headers or authenticated_sender is
1894 specified for this transport, and the string failed
1898 smtp_setup_conn(smtp_context * sx, BOOL suppress_tls)
1900 smtp_transport_options_block * ob = sx->conn_args.tblock->options_block;
1901 BOOL pass_message = FALSE;
1902 uschar * message = NULL;
1905 uschar * tls_errstr;
1908 sx->conn_args.ob = ob;
1910 sx->lmtp = strcmpic(ob->protocol, US"lmtp") == 0;
1911 sx->smtps = strcmpic(ob->protocol, US"smtps") == 0;
1912 /* sx->ok = FALSE; */
1913 sx->send_rset = TRUE;
1914 sx->send_quit = TRUE;
1915 sx->setting_up = TRUE;
1917 /* sx->esmtp_sent = FALSE; */
1919 /* sx->utf8_needed = FALSE; */
1921 sx->dsn_all_lasthop = TRUE;
1923 /* sx->conn_args.dane = FALSE; */
1925 verify_check_given_host(CUSS &ob->hosts_require_dane, sx->conn_args.host) == OK;
1927 #ifndef DISABLE_PIPE_CONNECT
1928 /* sx->early_pipe_active = sx->early_pipe_ok = FALSE; */
1929 /* sx->ehlo_resp.cleartext_features = sx->ehlo_resp.crypted_features = 0; */
1930 /* sx->pending_BANNER = sx->pending_EHLO = sx->pending_MAIL = FALSE; */
1933 if ((sx->max_rcpt = sx->conn_args.tblock->max_addresses) == 0) sx->max_rcpt = 999999;
1934 /* sx->peer_offered = 0; */
1935 /* sx->avoid_option = 0; */
1936 sx->igquotstr = US"";
1937 if (!sx->helo_data) sx->helo_data = ob->helo_data;
1938 #ifdef EXPERIMENTAL_DSN_INFO
1939 /* sx->smtp_greeting = NULL; */
1940 /* sx->helo_response = NULL; */
1943 smtp_command = US"initial connection";
1944 /* sx->buffer[0] = '\0'; */
1946 /* Set up the buffer for reading SMTP response packets. */
1948 sx->inblock.buffer = sx->inbuffer;
1949 sx->inblock.buffersize = sizeof(sx->inbuffer);
1950 sx->inblock.ptr = sx->inbuffer;
1951 sx->inblock.ptrend = sx->inbuffer;
1953 /* Set up the buffer for holding SMTP commands while pipelining */
1955 sx->outblock.buffer = sx->outbuffer;
1956 sx->outblock.buffersize = sizeof(sx->outbuffer);
1957 sx->outblock.ptr = sx->outbuffer;
1958 /* sx->outblock.cmd_count = 0; */
1959 /* sx->outblock.authenticating = FALSE; */
1960 /* sx->outblock.conn_args = NULL; */
1962 /* Reset the parameters of a TLS session. */
1965 tls_out.cipher = NULL; /* the one we may use for this transport */
1966 tls_out.ourcert = NULL;
1967 tls_out.peercert = NULL;
1968 tls_out.peerdn = NULL;
1972 tls_out.ocsp = OCSP_NOT_REQ;
1973 #ifdef EXPERIMENTAL_TLS_RESUME
1974 tls_out.resumption = 0;
1978 /* Flip the legacy TLS-related variables over to the outbound set in case
1979 they're used in the context of the transport. Don't bother resetting
1980 afterward (when being used by a transport) as we're in a subprocess.
1981 For verify, unflipped once the callout is dealt with */
1983 tls_modify_variables(&tls_out);
1988 set_errno_nohost(sx->addrlist, ERRNO_TLSFAILURE, US"TLS support not available",
1989 DEFER, FALSE, &sx->delivery_start);
1995 /* If we have a proxied TLS connection, check usability for this message */
1997 if (continue_hostname && continue_proxy_cipher)
2000 const uschar * sni = US"";
2002 /* Check if the message will be DANE-verified; if so force its SNI */
2004 smtp_port_for_connect(sx->conn_args.host, sx->port);
2005 if ( sx->conn_args.host->dnssec == DS_YES
2006 && ( sx->dane_required
2007 || verify_check_given_host(CUSS &ob->hosts_try_dane, sx->conn_args.host) == OK
2009 switch (rc = tlsa_lookup(sx->conn_args.host, &sx->conn_args.tlsa_dnsa, sx->dane_required))
2011 case OK: sx->conn_args.dane = TRUE;
2012 ob->tls_tempfail_tryclear = FALSE; /* force TLS */
2013 ob->tls_sni = sx->first_addr->domain; /* force SNI */
2015 case FAIL_FORCED: break;
2016 default: set_errno_nohost(sx->addrlist, ERRNO_DNSDEFER,
2017 string_sprintf("DANE error: tlsa lookup %s",
2019 rc, FALSE, &sx->delivery_start);
2020 # ifndef DISABLE_EVENT
2021 (void) event_raise(sx->conn_args.tblock->event_action,
2022 US"dane:fail", sx->dane_required
2023 ? US"dane-required" : US"dnssec-invalid");
2028 /* If the SNI required for the new message differs from the existing conn
2029 drop the connection to force a new one. */
2031 if (ob->tls_sni && !(sni = expand_cstring(ob->tls_sni)))
2032 log_write(0, LOG_MAIN|LOG_PANIC,
2033 "<%s>: failed to expand transport's tls_sni value: %s",
2034 sx->addrlist->address, expand_string_message);
2036 if ( (continue_proxy_sni ? (Ustrcmp(continue_proxy_sni, sni) == 0) : !*sni)
2037 && continue_proxy_dane == sx->conn_args.dane)
2039 tls_out.sni = US sni;
2040 if ((tls_out.dane_verified = continue_proxy_dane))
2041 sx->conn_args.host->dnssec = DS_YES;
2046 debug_printf("Closing proxied-TLS connection due to SNI mismatch\n");
2048 HDEBUG(D_transport|D_acl|D_v) debug_printf_indent(" SMTP>> QUIT\n");
2049 write(0, "QUIT\r\n", 6);
2051 tls_out.dane_verified = FALSE;
2052 continue_hostname = continue_proxy_cipher = NULL;
2053 f.continue_more = FALSE;
2054 continue_sequence = 1; /* Unfortunately, this process cannot affect success log
2055 which is done by delivery proc. Would have to pass this
2056 back through reporting pipe. */
2062 /* Make a connection to the host if this isn't a continued delivery, and handle
2063 the initial interaction and HELO/EHLO/LHLO. Connect timeout errors are handled
2064 specially so they can be identified for retries. */
2066 if (!continue_hostname)
2069 HDEBUG(D_verify) debug_printf("interface=%s port=%d\n", sx->conn_args.interface, sx->port);
2071 /* Get the actual port the connection will use, into sx->conn_args.host */
2073 smtp_port_for_connect(sx->conn_args.host, sx->port);
2076 /* Do TLSA lookup for DANE */
2078 tls_out.dane_verified = FALSE;
2079 tls_out.tlsa_usage = 0;
2081 if (sx->conn_args.host->dnssec == DS_YES)
2084 if( sx->dane_required
2085 || verify_check_given_host(CUSS &ob->hosts_try_dane, sx->conn_args.host) == OK
2087 switch (rc = tlsa_lookup(sx->conn_args.host, &sx->conn_args.tlsa_dnsa, sx->dane_required))
2089 case OK: sx->conn_args.dane = TRUE;
2090 ob->tls_tempfail_tryclear = FALSE; /* force TLS */
2091 ob->tls_sni = sx->first_addr->domain; /* force SNI */
2093 case FAIL_FORCED: break;
2094 default: set_errno_nohost(sx->addrlist, ERRNO_DNSDEFER,
2095 string_sprintf("DANE error: tlsa lookup %s",
2097 rc, FALSE, &sx->delivery_start);
2098 # ifndef DISABLE_EVENT
2099 (void) event_raise(sx->conn_args.tblock->event_action,
2100 US"dane:fail", sx->dane_required
2101 ? US"dane-required" : US"dnssec-invalid");
2106 else if (sx->dane_required)
2108 set_errno_nohost(sx->addrlist, ERRNO_DNSDEFER,
2109 string_sprintf("DANE error: %s lookup not DNSSEC", sx->conn_args.host->name),
2110 FAIL, FALSE, &sx->delivery_start);
2111 # ifndef DISABLE_EVENT
2112 (void) event_raise(sx->conn_args.tblock->event_action,
2113 US"dane:fail", US"dane-required");
2120 /* Make the TCP connection */
2122 sx->cctx.tls_ctx = NULL;
2123 sx->inblock.cctx = sx->outblock.cctx = &sx->cctx;
2124 sx->avoid_option = sx->peer_offered = smtp_peer_options = 0;
2126 #ifndef DISABLE_PIPE_CONNECT
2127 if ( verify_check_given_host(CUSS &ob->hosts_pipe_connect,
2128 sx->conn_args.host) == OK)
2130 /* We don't find out the local ip address until the connect, so if
2131 the helo string might use it avoid doing early-pipelining. */
2134 || !Ustrstr(sx->helo_data, "$sending_ip_address")
2135 || Ustrstr(sx->helo_data, "def:sending_ip_address")
2138 sx->early_pipe_ok = TRUE;
2139 if ( read_ehlo_cache_entry(sx)
2140 && sx->ehlo_resp.cleartext_features & OPTION_EARLY_PIPE)
2143 debug_printf("Using cached cleartext PIPE_CONNECT\n");
2144 sx->early_pipe_active = TRUE;
2145 sx->peer_offered = sx->ehlo_resp.cleartext_features;
2148 else DEBUG(D_transport)
2149 debug_printf("helo needs $sending_ip_address\n");
2152 if (sx->early_pipe_active)
2153 sx->outblock.conn_args = &sx->conn_args;
2157 if ((sx->cctx.sock = smtp_connect(&sx->conn_args, NULL)) < 0)
2159 set_errno_nohost(sx->addrlist,
2160 errno == ETIMEDOUT ? ERRNO_CONNECTTIMEOUT : errno,
2161 sx->verify ? US strerror(errno) : NULL,
2162 DEFER, FALSE, &sx->delivery_start);
2163 sx->send_quit = FALSE;
2167 /* Expand the greeting message while waiting for the initial response. (Makes
2168 sense if helo_data contains ${lookup dnsdb ...} stuff). The expansion is
2169 delayed till here so that $sending_interface and $sending_port are set. */
2170 /*XXX early-pipe: they still will not be. Is there any way to find out what they
2171 will be? Somehow I doubt it. */
2174 if (!(sx->helo_data = expand_string(sx->helo_data)))
2176 log_write(0, LOG_MAIN|LOG_PANIC,
2177 "<%s>: failed to expand transport's helo_data value for callout: %s",
2178 sx->addrlist->address, expand_string_message);
2183 expand_string_message = NULL;
2184 if ((sx->helo_data = string_domain_utf8_to_alabel(sx->helo_data,
2185 &expand_string_message)),
2186 expand_string_message)
2188 log_write(0, LOG_MAIN|LOG_PANIC,
2189 "<%s>: failed to expand transport's helo_data value for callout: %s",
2190 sx->addrlist->address, expand_string_message);
2192 sx->helo_data = NULL;
2196 /* The first thing is to wait for an initial OK response. The dreaded "goto"
2197 is nevertheless a reasonably clean way of programming this kind of logic,
2198 where you want to escape on any error. */
2202 #ifndef DISABLE_PIPE_CONNECT
2203 if (sx->early_pipe_active)
2205 sx->pending_BANNER = TRUE; /* sync_responses() must eventually handle */
2206 sx->outblock.cmd_count = 1;
2212 (void) setsockopt(sx->cctx.sock, IPPROTO_TCP, TCP_QUICKACK, US &off,
2215 if (!smtp_reap_banner(sx))
2216 goto RESPONSE_FAILED;
2219 #ifndef DISABLE_EVENT
2222 lookup_dnssec_authenticated = sx->conn_args.host->dnssec==DS_YES ? US"yes"
2223 : sx->conn_args.host->dnssec==DS_NO ? US"no" : NULL;
2224 s = event_raise(sx->conn_args.tblock->event_action, US"smtp:connect", sx->buffer);
2227 set_errno_nohost(sx->addrlist, ERRNO_EXPANDFAIL,
2228 string_sprintf("deferred by smtp:connect event expansion: %s", s),
2229 DEFER, FALSE, &sx->delivery_start);
2236 /* Now check if the helo_data expansion went well, and sign off cleanly if
2241 message = string_sprintf("failed to expand helo_data: %s",
2242 expand_string_message);
2243 set_errno_nohost(sx->addrlist, ERRNO_EXPANDFAIL, message, DEFER, FALSE, &sx->delivery_start);
2249 /** Debugging without sending a message
2250 sx->addrlist->transport_return = DEFER;
2254 /* Errors that occur after this point follow an SMTP command, which is
2255 left in big_buffer by smtp_write_command() for use in error messages. */
2257 smtp_command = big_buffer;
2259 /* Tell the remote who we are...
2261 February 1998: A convention has evolved that ESMTP-speaking MTAs include the
2262 string "ESMTP" in their greeting lines, so make Exim send EHLO if the
2263 greeting is of this form. The assumption was that the far end supports it
2264 properly... but experience shows that there are some that give 5xx responses,
2265 even though the banner includes "ESMTP" (there's a bloody-minded one that
2266 says "ESMTP not spoken here"). Cope with that case.
2268 September 2000: Time has passed, and it seems reasonable now to always send
2269 EHLO at the start. It is also convenient to make the change while installing
2272 July 2003: Joachim Wieland met a broken server that advertises "PIPELINING"
2273 but times out after sending MAIL FROM, RCPT TO and DATA all together. There
2274 would be no way to send out the mails, so there is now a host list
2275 "hosts_avoid_esmtp" that disables ESMTP for special hosts and solves the
2276 PIPELINING problem as well. Maybe it can also be useful to cure other
2277 problems with broken servers.
2279 Exim originally sent "Helo" at this point and ran for nearly a year that way.
2280 Then somebody tried it with a Microsoft mailer... It seems that all other
2281 mailers use upper case for some reason (the RFC is quite clear about case
2282 independence) so, for peace of mind, I gave in. */
2284 sx->esmtp = verify_check_given_host(CUSS &ob->hosts_avoid_esmtp, sx->conn_args.host) != OK;
2286 /* Alas; be careful, since this goto is not an error-out, so conceivably
2287 we might set data between here and the target which we assume to exist
2288 and be usable. I can see this coming back to bite us. */
2292 smtp_peer_options |= OPTION_TLS;
2293 suppress_tls = FALSE;
2294 ob->tls_tempfail_tryclear = FALSE;
2295 smtp_command = US"SSL-on-connect";
2302 if (smtp_write_command(sx,
2303 #ifndef DISABLE_PIPE_CONNECT
2304 sx->early_pipe_active ? SCMD_BUFFER :
2307 "%s %s\r\n", sx->lmtp ? "LHLO" : "EHLO", sx->helo_data) < 0)
2309 sx->esmtp_sent = TRUE;
2311 #ifndef DISABLE_PIPE_CONNECT
2312 if (sx->early_pipe_active)
2314 sx->pending_EHLO = TRUE;
2316 /* If we have too many authenticators to handle and might need to AUTH
2317 for this transport, pipeline no further as we will need the
2318 list of auth methods offered. Reap the banner and EHLO. */
2320 if ( (ob->hosts_require_auth || ob->hosts_try_auth)
2321 && f.smtp_in_early_pipe_no_auth)
2323 DEBUG(D_transport) debug_printf("may need to auth, so pipeline no further\n");
2324 if (smtp_write_command(sx, SCMD_FLUSH, NULL) < 0)
2326 if (sync_responses(sx, 2, 0) != 0)
2329 debug_printf("failed reaping pipelined cmd responses\n");
2330 goto RESPONSE_FAILED;
2332 sx->early_pipe_active = FALSE;
2337 if (!smtp_reap_ehlo(sx))
2338 goto RESPONSE_FAILED;
2342 debug_printf("not sending EHLO (host matches hosts_avoid_esmtp)\n");
2344 #ifndef DISABLE_PIPE_CONNECT
2345 if (!sx->early_pipe_active)
2350 int n = sizeof(sx->buffer);
2351 uschar * rsp = sx->buffer;
2353 if (sx->esmtp_sent && (n = Ustrlen(sx->buffer)) < sizeof(sx->buffer)/2)
2354 { rsp = sx->buffer + n + 1; n = sizeof(sx->buffer) - n; }
2356 if (smtp_write_command(sx, SCMD_FLUSH, "HELO %s\r\n", sx->helo_data) < 0)
2358 good_response = smtp_read_response(sx, rsp, n, '2', ob->command_timeout);
2359 #ifdef EXPERIMENTAL_DSN_INFO
2360 sx->helo_response = string_copy(rsp);
2364 /* Handle special logging for a closed connection after HELO
2365 when had previously sent EHLO */
2367 if (rsp != sx->buffer && rsp[0] == 0 && (errno == 0 || errno == ECONNRESET))
2369 errno = ERRNO_SMTPCLOSED;
2370 goto EHLOHELO_FAILED;
2372 memmove(sx->buffer, rsp, Ustrlen(rsp));
2373 goto RESPONSE_FAILED;
2377 if (sx->esmtp || sx->lmtp)
2379 #ifndef DISABLE_PIPE_CONNECT
2380 if (!sx->early_pipe_active)
2383 sx->peer_offered = ehlo_response(sx->buffer,
2384 OPTION_TLS /* others checked later */
2385 #ifndef DISABLE_PIPE_CONNECT
2386 | (sx->early_pipe_ok
2388 | OPTION_CHUNKING | OPTION_PRDR | OPTION_DSN | OPTION_PIPE | OPTION_SIZE
2397 #ifndef DISABLE_PIPE_CONNECT
2398 if (sx->early_pipe_ok)
2400 sx->ehlo_resp.cleartext_features = sx->peer_offered;
2402 if ( (sx->peer_offered & (OPTION_PIPE | OPTION_EARLY_PIPE))
2403 == (OPTION_PIPE | OPTION_EARLY_PIPE))
2405 DEBUG(D_transport) debug_printf("PIPE_CONNECT usable in future for this IP\n");
2406 sx->ehlo_resp.cleartext_auths = study_ehlo_auths(sx);
2407 write_ehlo_cache_entry(sx);
2413 /* Set tls_offered if the response to EHLO specifies support for STARTTLS. */
2416 smtp_peer_options |= sx->peer_offered & OPTION_TLS;
2421 /* For continuing deliveries down the same channel, having re-exec'd the socket
2422 is the standard input; for a socket held open from verify it is recorded
2423 in the cutthrough context block. Either way we don't need to redo EHLO here
2424 (but may need to do so for TLS - see below).
2425 Set up the pointer to where subsequent commands will be left, for
2426 error messages. Note that smtp_peer_options will have been
2427 set from the command line if they were set in the process that passed the
2430 /*XXX continue case needs to propagate DSN_INFO, prob. in deliver.c
2431 as the continue goes via transport_pass_socket() and doublefork and exec.
2432 It does not wait. Unclear how we keep separate host's responses
2433 separate - we could match up by host ip+port as a bodge. */
2437 if (cutthrough.cctx.sock >= 0 && cutthrough.callout_hold_only)
2439 sx->cctx = cutthrough.cctx;
2440 sx->conn_args.host->port = sx->port = cutthrough.host.port;
2444 sx->cctx.sock = 0; /* stdin */
2445 sx->cctx.tls_ctx = NULL;
2446 smtp_port_for_connect(sx->conn_args.host, sx->port); /* Record the port that was used */
2448 sx->inblock.cctx = sx->outblock.cctx = &sx->cctx;
2449 smtp_command = big_buffer;
2450 sx->peer_offered = smtp_peer_options;
2451 sx->helo_data = NULL; /* ensure we re-expand ob->helo_data */
2453 /* For a continued connection with TLS being proxied for us, or a
2454 held-open verify connection with TLS, nothing more to do. */
2456 if ( continue_proxy_cipher
2457 || (cutthrough.cctx.sock >= 0 && cutthrough.callout_hold_only
2458 && cutthrough.is_tls)
2461 sx->pipelining_used = pipelining_active = !!(smtp_peer_options & OPTION_PIPE);
2462 HDEBUG(D_transport) debug_printf("continued connection, %s TLS\n",
2463 continue_proxy_cipher ? "proxied" : "verify conn with");
2466 HDEBUG(D_transport) debug_printf("continued connection, no TLS\n");
2469 /* If TLS is available on this connection, whether continued or not, attempt to
2470 start up a TLS session, unless the host is in hosts_avoid_tls. If successful,
2471 send another EHLO - the server may give a different answer in secure mode. We
2472 use a separate buffer for reading the response to STARTTLS so that if it is
2473 negative, the original EHLO data is available for subsequent analysis, should
2474 the client not be required to use TLS. If the response is bad, copy the buffer
2475 for error analysis. */
2478 if ( smtp_peer_options & OPTION_TLS
2480 && verify_check_given_host(CUSS &ob->hosts_avoid_tls, sx->conn_args.host) != OK
2482 || verify_check_given_host(CUSS &ob->hosts_verify_avoid_tls, sx->conn_args.host) != OK
2485 uschar buffer2[4096];
2487 if (smtp_write_command(sx, SCMD_FLUSH, "STARTTLS\r\n") < 0)
2490 #ifndef DISABLE_PIPE_CONNECT
2491 /* If doing early-pipelining reap the banner and EHLO-response but leave
2492 the response for the STARTTLS we just sent alone. */
2494 if (sx->early_pipe_active && sync_responses(sx, 2, 0) != 0)
2497 debug_printf("failed reaping pipelined cmd responses\n");
2498 close(sx->cctx.sock);
2500 sx->early_pipe_active = FALSE;
2501 goto PIPE_CONNECT_RETRY;
2505 /* If there is an I/O error, transmission of this message is deferred. If
2506 there is a temporary rejection of STARRTLS and tls_tempfail_tryclear is
2507 false, we also defer. However, if there is a temporary rejection of STARTTLS
2508 and tls_tempfail_tryclear is true, or if there is an outright rejection of
2509 STARTTLS, we carry on. This means we will try to send the message in clear,
2510 unless the host is in hosts_require_tls (tested below). */
2512 if (!smtp_read_response(sx, buffer2, sizeof(buffer2), '2', ob->command_timeout))
2516 || (buffer2[0] == '4' && !ob->tls_tempfail_tryclear)
2519 Ustrncpy(sx->buffer, buffer2, sizeof(sx->buffer));
2520 sx->buffer[sizeof(sx->buffer)-1] = '\0';
2521 goto RESPONSE_FAILED;
2525 /* STARTTLS accepted: try to negotiate a TLS session. */
2530 if (!tls_client_start(&sx->cctx, &sx->conn_args, sx->addrlist, &tls_out, &tls_errstr))
2532 /* TLS negotiation failed; give an error. From outside, this function may
2533 be called again to try in clear on a new connection, if the options permit
2534 it for this host. */
2538 DEBUG(D_tls) debug_printf("TLS session fail: %s\n", tls_errstr);
2540 # ifdef SUPPORT_DANE
2541 if (sx->conn_args.dane)
2543 log_write(0, LOG_MAIN,
2544 "DANE attempt failed; TLS connection to %s [%s]: %s",
2545 sx->conn_args.host->name, sx->conn_args.host->address, tls_errstr);
2546 # ifndef DISABLE_EVENT
2547 (void) event_raise(sx->conn_args.tblock->event_action,
2548 US"dane:fail", US"validation-failure"); /* could do with better detail */
2553 errno = ERRNO_TLSFAILURE;
2554 message = string_sprintf("TLS session: %s", tls_errstr);
2555 sx->send_quit = FALSE;
2559 /* TLS session is set up */
2561 smtp_peer_options_wrap = smtp_peer_options;
2562 for (address_item * addr = sx->addrlist; addr; addr = addr->next)
2563 if (addr->transport_return == PENDING_DEFER)
2565 addr->cipher = tls_out.cipher;
2566 addr->ourcert = tls_out.ourcert;
2567 addr->peercert = tls_out.peercert;
2568 addr->peerdn = tls_out.peerdn;
2569 addr->ocsp = tls_out.ocsp;
2570 addr->tlsver = tls_out.ver;
2575 /* if smtps, we'll have smtp_command set to something else; always safe to
2577 smtp_command = big_buffer;
2579 /* If we started TLS, redo the EHLO/LHLO exchange over the secure channel. If
2580 helo_data is null, we are dealing with a connection that was passed from
2581 another process, and so we won't have expanded helo_data above. We have to
2582 expand it here. $sending_ip_address and $sending_port are set up right at the
2583 start of the Exim process (in exim.c). */
2585 if (tls_out.active.sock >= 0)
2587 uschar * greeting_cmd;
2589 if (!sx->helo_data && !(sx->helo_data = expand_string(ob->helo_data)))
2591 uschar *message = string_sprintf("failed to expand helo_data: %s",
2592 expand_string_message);
2593 set_errno_nohost(sx->addrlist, ERRNO_EXPANDFAIL, message, DEFER, FALSE, &sx->delivery_start);
2598 #ifndef DISABLE_PIPE_CONNECT
2599 /* For SMTPS there is no cleartext early-pipe; use the crypted permission bit.
2600 We're unlikely to get the group sent and delivered before the server sends its
2601 banner, but it's still worth sending as a group.
2602 For STARTTLS allow for cleartext early-pipe but no crypted early-pipe, but not
2605 if (sx->smtps ? sx->early_pipe_ok : sx->early_pipe_active)
2607 sx->peer_offered = sx->ehlo_resp.crypted_features;
2608 if ((sx->early_pipe_active =
2609 !!(sx->ehlo_resp.crypted_features & OPTION_EARLY_PIPE)))
2610 DEBUG(D_transport) debug_printf("Using cached crypted PIPE_CONNECT\n");
2614 /* For SMTPS we need to wait for the initial OK response. */
2616 #ifndef DISABLE_PIPE_CONNECT
2617 if (sx->early_pipe_active)
2619 sx->pending_BANNER = TRUE;
2620 sx->outblock.cmd_count = 1;
2624 if (!smtp_reap_banner(sx))
2625 goto RESPONSE_FAILED;
2628 greeting_cmd = US"LHLO";
2630 greeting_cmd = US"EHLO";
2633 greeting_cmd = US"HELO";
2635 debug_printf("not sending EHLO (host matches hosts_avoid_esmtp)\n");
2638 if (smtp_write_command(sx,
2639 #ifndef DISABLE_PIPE_CONNECT
2640 sx->early_pipe_active ? SCMD_BUFFER :
2643 "%s %s\r\n", greeting_cmd, sx->helo_data) < 0)
2646 #ifndef DISABLE_PIPE_CONNECT
2647 if (sx->early_pipe_active)
2648 sx->pending_EHLO = TRUE;
2652 if (!smtp_reap_ehlo(sx))
2655 /* The GnuTLS layer in Exim only spots a server-rejection of a client
2656 cert late, under TLS1.3 - which means here; the first time we try to
2657 receive crypted data. Treat it as if it was a connect-time failure.
2658 See also the early-pipe equivalent... which will be hard; every call
2659 to sync_responses will need to check the result.
2660 It would be nicer to have GnuTLS check the cert during the handshake.
2661 Can it do that, with all the flexibility we need? */
2663 tls_errstr = US"error on first read";
2664 goto GNUTLS_CONN_FAILED;
2667 goto RESPONSE_FAILED;
2669 smtp_peer_options = 0;
2673 /* If the host is required to use a secure channel, ensure that we
2677 # ifdef SUPPORT_DANE
2678 || sx->conn_args.dane
2680 || verify_check_given_host(CUSS &ob->hosts_require_tls, sx->conn_args.host) == OK
2683 errno = ERRNO_TLSREQUIRED;
2684 message = string_sprintf("a TLS session is required, but %s",
2685 smtp_peer_options & OPTION_TLS
2686 ? "an attempt to start TLS failed" : "the server did not offer TLS support");
2687 # if defined(SUPPORT_DANE) && !defined(DISABLE_EVENT)
2688 if (sx->conn_args.dane)
2689 (void) event_raise(sx->conn_args.tblock->event_action, US"dane:fail",
2690 smtp_peer_options & OPTION_TLS
2691 ? US"validation-failure" /* could do with better detail */
2692 : US"starttls-not-supported");
2696 #endif /*DISABLE_TLS*/
2698 /* If TLS is active, we have just started it up and re-done the EHLO command,
2699 so its response needs to be analyzed. If TLS is not active and this is a
2700 continued session down a previously-used socket, we haven't just done EHLO, so
2703 if (continue_hostname == NULL
2705 || tls_out.active.sock >= 0
2709 if (sx->esmtp || sx->lmtp)
2711 #ifndef DISABLE_PIPE_CONNECT
2712 if (!sx->early_pipe_active)
2715 sx->peer_offered = ehlo_response(sx->buffer,
2717 #ifndef DISABLE_PIPE_CONNECT
2718 | (sx->lmtp && ob->lmtp_ignore_quota ? OPTION_IGNQ : 0)
2719 | OPTION_DSN | OPTION_PIPE | OPTION_SIZE
2720 | OPTION_CHUNKING | OPTION_PRDR | OPTION_UTF8
2721 | (tls_out.active.sock >= 0 ? OPTION_EARLY_PIPE : 0) /* not for lmtp */
2725 | (sx->lmtp && ob->lmtp_ignore_quota ? OPTION_IGNQ : 0)
2728 # ifdef SUPPORT_I18N
2729 | (sx->addrlist->prop.utf8_msg ? OPTION_UTF8 : 0)
2730 /*XXX if we hand peercaps on to continued-conn processes,
2731 must not depend on this addr */
2735 | (ob->size_addition >= 0 ? OPTION_SIZE : 0)
2738 #ifndef DISABLE_PIPE_CONNECT
2739 if (tls_out.active.sock >= 0)
2740 sx->ehlo_resp.crypted_features = sx->peer_offered;
2744 /* Set for IGNOREQUOTA if the response to LHLO specifies support and the
2745 lmtp_ignore_quota option was set. */
2747 sx->igquotstr = sx->peer_offered & OPTION_IGNQ ? US" IGNOREQUOTA" : US"";
2749 /* If the response to EHLO specified support for the SIZE parameter, note
2750 this, provided size_addition is non-negative. */
2752 smtp_peer_options |= sx->peer_offered & OPTION_SIZE;
2754 /* Note whether the server supports PIPELINING. If hosts_avoid_esmtp matched
2755 the current host, esmtp will be false, so PIPELINING can never be used. If
2756 the current host matches hosts_avoid_pipelining, don't do it. */
2758 if ( sx->peer_offered & OPTION_PIPE
2759 && verify_check_given_host(CUSS &ob->hosts_avoid_pipelining, sx->conn_args.host) != OK)
2760 smtp_peer_options |= OPTION_PIPE;
2762 DEBUG(D_transport) debug_printf("%susing PIPELINING\n",
2763 smtp_peer_options & OPTION_PIPE ? "" : "not ");
2765 if ( sx->peer_offered & OPTION_CHUNKING
2766 && verify_check_given_host(CUSS &ob->hosts_try_chunking, sx->conn_args.host) != OK)
2767 sx->peer_offered &= ~OPTION_CHUNKING;
2769 if (sx->peer_offered & OPTION_CHUNKING)
2770 DEBUG(D_transport) debug_printf("CHUNKING usable\n");
2772 #ifndef DISABLE_PRDR
2773 if ( sx->peer_offered & OPTION_PRDR
2774 && verify_check_given_host(CUSS &ob->hosts_try_prdr, sx->conn_args.host) != OK)
2775 sx->peer_offered &= ~OPTION_PRDR;
2777 if (sx->peer_offered & OPTION_PRDR)
2778 DEBUG(D_transport) debug_printf("PRDR usable\n");
2781 /* Note if the server supports DSN */
2782 smtp_peer_options |= sx->peer_offered & OPTION_DSN;
2783 DEBUG(D_transport) debug_printf("%susing DSN\n",
2784 sx->peer_offered & OPTION_DSN ? "" : "not ");
2786 #ifndef DISABLE_PIPE_CONNECT
2787 if ( sx->early_pipe_ok
2788 && !sx->early_pipe_active
2789 && tls_out.active.sock >= 0
2790 && smtp_peer_options & OPTION_PIPE
2791 && ( sx->ehlo_resp.cleartext_features | sx->ehlo_resp.crypted_features)
2792 & OPTION_EARLY_PIPE)
2794 DEBUG(D_transport) debug_printf("PIPE_CONNECT usable in future for this IP\n");
2795 sx->ehlo_resp.crypted_auths = study_ehlo_auths(sx);
2796 write_ehlo_cache_entry(sx);
2800 /* Note if the response to EHLO specifies support for the AUTH extension.
2801 If it has, check that this host is one we want to authenticate to, and do
2802 the business. The host name and address must be available when the
2803 authenticator's client driver is running. */
2805 switch (yield = smtp_auth(sx))
2807 default: goto SEND_QUIT;
2809 case FAIL_SEND: goto SEND_FAILED;
2810 case FAIL: goto RESPONSE_FAILED;
2814 sx->pipelining_used = pipelining_active = !!(smtp_peer_options & OPTION_PIPE);
2816 /* The setting up of the SMTP call is now complete. Any subsequent errors are
2817 message-specific. */
2819 sx->setting_up = FALSE;
2822 if (sx->addrlist->prop.utf8_msg)
2826 /* If the transport sets a downconversion mode it overrides any set by ACL
2829 if ((s = ob->utf8_downconvert))
2831 if (!(s = expand_string(s)))
2833 message = string_sprintf("failed to expand utf8_downconvert: %s",
2834 expand_string_message);
2835 set_errno_nohost(sx->addrlist, ERRNO_EXPANDFAIL, message, DEFER, FALSE, &sx->delivery_start);
2841 case '1': sx->addrlist->prop.utf8_downcvt = TRUE;
2842 sx->addrlist->prop.utf8_downcvt_maybe = FALSE;
2844 case '0': sx->addrlist->prop.utf8_downcvt = FALSE;
2845 sx->addrlist->prop.utf8_downcvt_maybe = FALSE;
2847 case '-': if (s[1] == '1')
2849 sx->addrlist->prop.utf8_downcvt = FALSE;
2850 sx->addrlist->prop.utf8_downcvt_maybe = TRUE;
2856 sx->utf8_needed = !sx->addrlist->prop.utf8_downcvt
2857 && !sx->addrlist->prop.utf8_downcvt_maybe;
2858 DEBUG(D_transport) if (!sx->utf8_needed)
2859 debug_printf("utf8: %s downconvert\n",
2860 sx->addrlist->prop.utf8_downcvt ? "mandatory" : "optional");
2863 /* If this is an international message we need the host to speak SMTPUTF8 */
2864 if (sx->utf8_needed && !(sx->peer_offered & OPTION_UTF8))
2866 errno = ERRNO_UTF8_FWD;
2867 goto RESPONSE_FAILED;
2869 #endif /*SUPPORT_I18N*/
2878 if (errno == ECONNREFUSED) /* first-read error on a TFO conn */
2880 /* There is a testing facility for simulating a connection timeout, as I
2881 can't think of any other way of doing this. It converts a connection
2882 refused into a timeout if the timeout is set to 999999. This is done for
2883 a 3whs connection in ip_connect(), but a TFO connection does not error
2884 there - instead it gets ECONNREFUSED on the first data read. Tracking
2885 that a TFO really was done is too hard, or we would set a
2886 sx->pending_conn_done bit and test that in smtp_reap_banner() and
2887 smtp_reap_ehlo(). That would let us also add the conn-timeout to the
2890 if (f.running_in_test_harness && ob->connect_timeout == 999999)
2892 set_errno_nohost(sx->addrlist,
2893 errno == ETIMEDOUT ? ERRNO_CONNECTTIMEOUT : errno,
2894 sx->verify ? US strerror(errno) : NULL,
2895 DEFER, FALSE, &sx->delivery_start);
2896 sx->send_quit = FALSE;
2900 /* really an error on an SMTP read */
2902 sx->send_quit = check_response(sx->conn_args.host, &errno, sx->addrlist->more_errno,
2903 sx->buffer, &code, &message, &pass_message);
2909 message = US string_sprintf("send() to %s [%s] failed: %s",
2910 sx->conn_args.host->name, sx->conn_args.host->address, strerror(errno));
2911 sx->send_quit = FALSE;
2917 message = string_sprintf("Remote host closed connection in response to %s"
2918 " (EHLO response was: %s)", smtp_command, sx->buffer);
2919 sx->send_quit = FALSE;
2923 /* This label is jumped to directly when a TLS negotiation has failed,
2924 or was not done for a host for which it is required. Values will be set
2925 in message and errno, and setting_up will always be true. Treat as
2926 a temporary error. */
2930 code = '4', yield = DEFER;
2934 /* The failure happened while setting up the call; see if the failure was
2935 a 5xx response (this will either be on connection, or following HELO - a 5xx
2936 after EHLO causes it to try HELO). If so, and there are no more hosts to try,
2937 fail all addresses, as this host is never going to accept them. For other
2938 errors during setting up (timeouts or whatever), defer all addresses, and
2939 yield DEFER, so that the host is not tried again for a while.
2941 XXX This peeking for another host feels like a layering violation. We want
2942 to note the host as unusable, but down here we shouldn't know if this was
2943 the last host to try for the addr(list). Perhaps the upper layer should be
2944 the one to do set_errno() ? The problem is that currently the addr is where
2945 errno etc. are stashed, but until we run out of hosts to try the errors are
2946 host-specific. Maybe we should enhance the host_item definition? */
2949 sx->ok = FALSE; /* For when reached by GOTO */
2950 set_errno(sx->addrlist, errno, message,
2951 sx->conn_args.host->next
2955 || errno == ERRNO_UTF8_FWD
2959 errno == ECONNREFUSED ? NULL : sx->conn_args.host,
2960 #ifdef EXPERIMENTAL_DSN_INFO
2961 sx->smtp_greeting, sx->helo_response,
2963 &sx->delivery_start);
2970 (void)smtp_write_command(sx, SCMD_FLUSH, "QUIT\r\n");
2973 if (sx->cctx.tls_ctx)
2975 tls_close(sx->cctx.tls_ctx, TLS_SHUTDOWN_NOWAIT);
2976 sx->cctx.tls_ctx = NULL;
2980 /* Close the socket, and return the appropriate value, first setting
2981 works because the NULL setting is passed back to the calling process, and
2982 remote_max_parallel is forced to 1 when delivering over an existing connection,
2985 HDEBUG(D_transport|D_acl|D_v) debug_printf_indent(" SMTP(close)>>\n");
2988 shutdown(sx->cctx.sock, SHUT_WR);
2989 if (fcntl(sx->cctx.sock, F_SETFL, O_NONBLOCK) == 0)
2990 for (int i = 16; read(sx->cctx.sock, sx->inbuffer, sizeof(sx->inbuffer)) > 0 && i > 0;)
2991 i--; /* drain socket */
2992 sx->send_quit = FALSE;
2994 (void)close(sx->cctx.sock);
2997 #ifndef DISABLE_EVENT
2998 (void) event_raise(sx->conn_args.tblock->event_action, US"tcp:close", NULL);
3001 continue_transport = NULL;
3002 continue_hostname = NULL;
3009 /* Create the string of options that will be appended to the MAIL FROM:
3010 in the connection context buffer */
3013 build_mailcmd_options(smtp_context * sx, address_item * addrlist)
3015 uschar * p = sx->buffer;
3016 address_item * addr;
3021 /* If we know the receiving MTA supports the SIZE qualification, and we know it,
3022 send it, adding something to the message size to allow for imprecision
3023 and things that get added en route. Exim keeps the number of lines
3024 in a message, so we can give an accurate value for the original message, but we
3025 need some additional to handle added headers. (Double "." characters don't get
3026 included in the count.) */
3028 if ( message_size > 0
3029 && sx->peer_offered & OPTION_SIZE && !(sx->avoid_option & OPTION_SIZE))
3031 /*XXX problem here under spool_files_wireformat?
3032 Or just forget about lines? Or inflate by a fixed proportion? */
3034 sprintf(CS p, " SIZE=%d", message_size+message_linecount+(SOB sx->conn_args.ob)->size_addition);
3038 #ifndef DISABLE_PRDR
3039 /* If it supports Per-Recipient Data Responses, and we have more than one recipient,
3042 sx->prdr_active = FALSE;
3043 if (sx->peer_offered & OPTION_PRDR)
3044 for (address_item * addr = addrlist; addr; addr = addr->next)
3045 if (addr->transport_return == PENDING_DEFER)
3047 for (addr = addr->next; addr; addr = addr->next)
3048 if (addr->transport_return == PENDING_DEFER)
3049 { /* at least two recipients to send */
3050 sx->prdr_active = TRUE;
3051 sprintf(CS p, " PRDR"); p += 5;
3059 /* If it supports internationalised messages, and this meesage need that,
3062 if ( sx->peer_offered & OPTION_UTF8
3063 && addrlist->prop.utf8_msg
3064 && !addrlist->prop.utf8_downcvt
3066 Ustrcpy(p, US" SMTPUTF8"), p += 9;
3069 /* check if all addresses have DSN-lasthop flag; do not send RET and ENVID if so */
3070 for (sx->dsn_all_lasthop = TRUE, addr = addrlist, address_count = 0;
3071 addr && address_count < sx->max_rcpt;
3072 addr = addr->next) if (addr->transport_return == PENDING_DEFER)
3075 if (!(addr->dsn_flags & rf_dsnlasthop))
3077 sx->dsn_all_lasthop = FALSE;
3082 /* Add any DSN flags to the mail command */
3084 if (sx->peer_offered & OPTION_DSN && !sx->dsn_all_lasthop)
3086 if (dsn_ret == dsn_ret_hdrs)
3087 { Ustrcpy(p, US" RET=HDRS"); p += 9; }
3088 else if (dsn_ret == dsn_ret_full)
3089 { Ustrcpy(p, US" RET=FULL"); p += 9; }
3093 string_format(p, sizeof(sx->buffer) - (p-sx->buffer), " ENVID=%s", dsn_envid);
3098 /* If an authenticated_sender override has been specified for this transport
3099 instance, expand it. If the expansion is forced to fail, and there was already
3100 an authenticated_sender for this message, the original value will be used.
3101 Other expansion failures are serious. An empty result is ignored, but there is
3102 otherwise no check - this feature is expected to be used with LMTP and other
3103 cases where non-standard addresses (e.g. without domains) might be required. */
3105 return smtp_mail_auth_str(sx, p, addrlist) ? ERROR : OK;
3110 build_rcptcmd_options(smtp_context * sx, const address_item * addr)
3112 uschar * p = sx->buffer;
3115 /* Add any DSN flags to the rcpt command */
3117 if (sx->peer_offered & OPTION_DSN && !(addr->dsn_flags & rf_dsnlasthop))
3119 if (addr->dsn_flags & rf_dsnflags)
3123 Ustrcpy(p, US" NOTIFY=");
3125 for (int i = 0; i < nelem(rf_list); i++) if (addr->dsn_flags & rf_list[i])
3127 if (!first) *p++ = ',';
3129 Ustrcpy(p, rf_names[i]);
3134 if (addr->dsn_orcpt)
3136 string_format(p, sizeof(sx->buffer) - (p-sx->buffer), " ORCPT=%s",
3147 0 good, rcpt results in addr->transport_return (PENDING_OK, DEFER, FAIL)
3148 -1 MAIL response error
3149 -2 any non-MAIL read i/o error
3150 -3 non-MAIL response timeout
3151 -4 internal error; channel still usable
3156 smtp_write_mail_and_rcpt_cmds(smtp_context * sx, int * yield)
3158 address_item * addr;
3159 int address_count, pipe_limit;
3162 if (build_mailcmd_options(sx, sx->first_addr) != OK)
3168 /* From here until we send the DATA command, we can make use of PIPELINING
3169 if the server host supports it. The code has to be able to check the responses
3170 at any point, for when the buffer fills up, so we write it totally generally.
3171 When PIPELINING is off, each command written reports that it has flushed the
3174 sx->pending_MAIL = TRUE; /* The block starts with MAIL */
3177 uschar * s = sx->from_addr;
3179 uschar * errstr = NULL;
3181 /* If we must downconvert, do the from-address here. Remember we had to
3182 for the to-addresses (done below), and also (ugly) for re-doing when building
3183 the delivery log line. */
3185 if ( sx->addrlist->prop.utf8_msg
3186 && (sx->addrlist->prop.utf8_downcvt || !(sx->peer_offered & OPTION_UTF8))
3189 if (s = string_address_utf8_to_alabel(s, &errstr), errstr)
3191 set_errno_nohost(sx->addrlist, ERRNO_EXPANDFAIL, errstr, DEFER, FALSE, &sx->delivery_start);
3195 setflag(sx->addrlist, af_utf8_downcvt);
3199 rc = smtp_write_command(sx, pipelining_active ? SCMD_BUFFER : SCMD_FLUSH,
3200 "MAIL FROM:<%s>%s\r\n", s, sx->buffer);
3203 mail_command = string_copy(big_buffer); /* Save for later error message */
3207 case -1: /* Transmission error */
3210 case +1: /* Cmd was sent */
3211 if (!smtp_read_response(sx, sx->buffer, sizeof(sx->buffer), '2',
3212 (SOB sx->conn_args.ob)->command_timeout))
3214 if (errno == 0 && sx->buffer[0] == '4')
3216 errno = ERRNO_MAIL4XX;
3217 sx->addrlist->more_errno |= ((sx->buffer[1] - '0')*10 + sx->buffer[2] - '0') << 8;
3221 sx->pending_MAIL = FALSE;
3224 /* otherwise zero: command queued for pipeline */
3227 /* Pass over all the relevant recipient addresses for this host, which are the
3228 ones that have status PENDING_DEFER. If we are using PIPELINING, we can send
3229 several before we have to read the responses for those seen so far. This
3230 checking is done by a subroutine because it also needs to be done at the end.
3231 Send only up to max_rcpt addresses at a time, leaving next_addr pointing to
3232 the next one if not all are sent.
3234 In the MUA wrapper situation, we want to flush the PIPELINING buffer for the
3235 last address because we want to abort if any recipients have any kind of
3236 problem, temporary or permanent. We know that all recipient addresses will have
3237 the PENDING_DEFER status, because only one attempt is ever made, and we know
3238 that max_rcpt will be large, so all addresses will be done at once.
3240 For verify we flush the pipeline after any (the only) rcpt address. */
3242 for (addr = sx->first_addr, address_count = 0, pipe_limit = 100;
3243 addr && address_count < sx->max_rcpt;
3244 addr = addr->next) if (addr->transport_return == PENDING_DEFER)
3250 addr->dsn_aware = sx->peer_offered & OPTION_DSN
3251 ? dsn_support_yes : dsn_support_no;
3254 if (pipe_limit-- <= 0)
3255 { no_flush = FALSE; pipe_limit = 100; }
3257 no_flush = pipelining_active && !sx->verify
3258 && (!mua_wrapper || addr->next && address_count < sx->max_rcpt);
3260 build_rcptcmd_options(sx, addr);
3262 /* Now send the RCPT command, and process outstanding responses when
3263 necessary. After a timeout on RCPT, we just end the function, leaving the
3264 yield as OK, because this error can often mean that there is a problem with
3265 just one address, so we don't want to delay the host. */
3267 rcpt_addr = transport_rcpt_address(addr, sx->conn_args.tblock->rcpt_include_affixes);
3270 if ( testflag(sx->addrlist, af_utf8_downcvt)
3271 && !(rcpt_addr = string_address_utf8_to_alabel(rcpt_addr, NULL))
3274 /*XXX could we use a per-address errstr here? Not fail the whole send? */
3275 errno = ERRNO_EXPANDFAIL;
3276 return -5; /*XXX too harsh? */
3280 cmds_sent = smtp_write_command(sx, no_flush ? SCMD_BUFFER : SCMD_FLUSH,
3281 "RCPT TO:<%s>%s%s\r\n", rcpt_addr, sx->igquotstr, sx->buffer);
3283 if (cmds_sent < 0) return -5;
3286 switch(sync_responses(sx, cmds_sent, 0))
3288 case 3: sx->ok = TRUE; /* 2xx & 5xx => OK & progress made */
3289 case 2: sx->completed_addr = TRUE; /* 5xx (only) => progress made */
3292 case 1: sx->ok = TRUE; /* 2xx (only) => OK, but if LMTP, */
3293 if (!sx->lmtp) /* can't tell about progress yet */
3294 sx->completed_addr = TRUE;
3295 case 0: /* No 2xx or 5xx, but no probs */
3296 /* If any RCPT got a 452 response then next_addr has been updated
3297 for restarting with a new MAIL on the same connection. Send no more
3298 RCPTs for this MAIL. */
3302 DEBUG(D_transport) debug_printf("seen 452 too-many-rcpts\n");
3303 sx->RCPT_452 = FALSE;
3304 /* sx->next_addr has been reset for fast_retry */
3309 case -1: return -3; /* Timeout on RCPT */
3310 case -2: return -2; /* non-MAIL read i/o error */
3311 default: return -1; /* any MAIL error */
3313 #ifndef DISABLE_PIPE_CONNECT
3314 case -4: return -1; /* non-2xx for pipelined banner or EHLO */
3315 case -5: return -1; /* TLS first-read error */
3319 } /* Loop for next address */
3321 sx->next_addr = addr;
3327 /*****************************************************
3328 * Proxy TLS connection for another transport process *
3329 ******************************************************/
3331 Close the unused end of the pipe, fork once more, then use the given buffer
3332 as a staging area, and select on both the given fd and the TLS'd client-fd for
3333 data to read (per the coding in ip_recv() and fd_ready() this is legitimate).
3334 Do blocking full-size writes, and reads under a timeout. Once both input
3335 channels are closed, exit the process.
3339 buf space to use for buffering
3340 bufsiz size of buffer
3341 pfd pipe filedescriptor array; [0] is comms to proxied process
3342 timeout per-read timeout, seconds
3348 smtp_proxy_tls(void * ct_ctx, uschar * buf, size_t bsize, int * pfd,
3352 int max_fd = MAX(pfd[0], tls_out.active.sock) + 1;
3356 if ((rc = exim_fork(US"tls-proxy")))
3357 _exit(rc < 0 ? EXIT_FAILURE : EXIT_SUCCESS);
3359 set_process_info("proxying TLS connection for continued transport");
3361 FD_SET(tls_out.active.sock, &rfds);
3362 FD_SET(pfd[0], &rfds);
3364 for (int fd_bits = 3; fd_bits; )
3366 time_t time_left = timeout;
3367 time_t time_start = time(NULL);
3373 struct timeval tv = { time_left, 0 };
3376 (SELECT_ARG2_TYPE *)&rfds, NULL, (SELECT_ARG2_TYPE *)&efds, &tv);
3378 if (rc < 0 && errno == EINTR)
3379 if ((time_left -= time(NULL) - time_start) > 0) continue;
3383 DEBUG(D_transport) if (rc == 0) debug_printf("%s: timed out\n", __FUNCTION__);
3387 if (FD_ISSET(tls_out.active.sock, &efds) || FD_ISSET(pfd[0], &efds))
3389 DEBUG(D_transport) debug_printf("select: exceptional cond on %s fd\n",
3390 FD_ISSET(pfd[0], &efds) ? "proxy" : "tls");
3394 while (rc < 0 || !(FD_ISSET(tls_out.active.sock, &rfds) || FD_ISSET(pfd[0], &rfds)));
3396 /* handle inbound data */
3397 if (FD_ISSET(tls_out.active.sock, &rfds))
3398 if ((rc = tls_read(ct_ctx, buf, bsize)) <= 0)
3401 FD_CLR(tls_out.active.sock, &rfds);
3402 shutdown(pfd[0], SHUT_WR);
3407 for (int nbytes = 0; rc - nbytes > 0; nbytes += i)
3408 if ((i = write(pfd[0], buf + nbytes, rc - nbytes)) < 0) goto done;
3410 else if (fd_bits & 1)
3411 FD_SET(tls_out.active.sock, &rfds);
3413 /* handle outbound data */
3414 if (FD_ISSET(pfd[0], &rfds))
3415 if ((rc = read(pfd[0], buf, bsize)) <= 0)
3418 tls_close(ct_ctx, TLS_SHUTDOWN_NOWAIT);
3423 for (int nbytes = 0; rc - nbytes > 0; nbytes += i)
3424 if ((i = tls_write(ct_ctx, buf + nbytes, rc - nbytes, FALSE)) < 0)
3427 else if (fd_bits & 2)
3428 FD_SET(pfd[0], &rfds);
3432 testharness_pause_ms(100); /* let logging complete */
3433 exim_exit(EXIT_SUCCESS);
3438 /*************************************************
3439 * Deliver address list to given host *
3440 *************************************************/
3442 /* If continue_hostname is not null, we get here only when continuing to
3443 deliver down an existing channel. The channel was passed as the standard
3444 input. TLS is never active on a passed channel; the previous process either
3445 closes it down before passing the connection on, or inserts a TLS-proxy
3446 process and passes on a cleartext conection.
3448 Otherwise, we have to make a connection to the remote host, and do the
3449 initial protocol exchange.
3451 When running as an MUA wrapper, if the sender or any recipient is rejected,
3452 temporarily or permanently, we force failure for all recipients.
3455 addrlist chain of potential addresses to deliver; only those whose
3456 transport_return field is set to PENDING_DEFER are currently
3457 being processed; others should be skipped - they have either
3458 been delivered to an earlier host or IP address, or been
3459 failed by one of them.
3460 host host to deliver to
3461 host_af AF_INET or AF_INET6
3462 defport default TCP/IP port to use if host does not specify, in host
3464 interface interface to bind to, or NULL
3465 tblock transport instance block
3466 message_defer set TRUE if yield is OK, but all addresses were deferred
3467 because of a non-recipient, non-host failure, that is, a
3468 4xx response to MAIL FROM, DATA, or ".". This is a defer
3469 that is specific to the message.
3470 suppress_tls if TRUE, don't attempt a TLS connection - this is set for
3471 a second attempt after TLS initialization fails
3473 Returns: OK - the connection was made and the delivery attempted;
3474 the result for each address is in its data block.
3475 DEFER - the connection could not be made, or something failed
3476 while setting up the SMTP session, or there was a
3477 non-message-specific error, such as a timeout.
3478 ERROR - a filter command is specified for this transport,
3479 and there was a problem setting it up; OR helo_data
3480 or add_headers or authenticated_sender is specified
3481 for this transport, and the string failed to expand
3483 For all non-OK returns the first addr of the list carries the
3484 time taken for the attempt.
3488 smtp_deliver(address_item *addrlist, host_item *host, int host_af, int defport,
3489 uschar *interface, transport_instance *tblock,
3490 BOOL *message_defer, BOOL suppress_tls)
3492 smtp_transport_options_block * ob = SOB tblock->options_block;
3497 BOOL pass_message = FALSE;
3498 uschar *message = NULL;
3499 uschar new_message_id[MESSAGE_ID_LENGTH + 1];
3500 smtp_context * sx = store_get(sizeof(*sx), TRUE); /* tainted, for the data buffers */
3505 suppress_tls = suppress_tls; /* stop compiler warning when no TLS support */
3506 *message_defer = FALSE;
3508 memset(sx, 0, sizeof(*sx));
3509 sx->addrlist = addrlist;
3510 sx->conn_args.host = host;
3511 sx->conn_args.host_af = host_af,
3513 sx->conn_args.interface = interface;
3514 sx->helo_data = NULL;
3515 sx->conn_args.tblock = tblock;
3516 /* sx->verify = FALSE; */
3517 gettimeofday(&sx->delivery_start, NULL);
3518 sx->sync_addr = sx->first_addr = addrlist;
3525 /* Get the channel set up ready for a message, MAIL FROM being the next
3526 SMTP command to send. */
3528 if ((rc = smtp_setup_conn(sx, suppress_tls)) != OK)
3530 timesince(&addrlist->delivery_time, &sx->delivery_start);
3536 /* If the connection used DANE, ignore for now any addresses with incompatible
3537 domains. The SNI has to be the domain. Arrange a whole new TCP conn later,
3538 just in case only TLS isn't enough. */
3540 if (sx->conn_args.dane)
3542 const uschar * dane_domain = sx->first_addr->domain;
3544 for (address_item * a = sx->first_addr->next; a; a = a->next)
3545 if ( a->transport_return == PENDING_DEFER
3546 && Ustrcmp(dane_domain, a->domain) != 0)
3548 DEBUG(D_transport) debug_printf("DANE: holding %s for later\n", a->domain);
3550 a->transport_return = DANE;
3555 /* If there is a filter command specified for this transport, we can now
3556 set it up. This cannot be done until the identity of the host is known. */
3558 if (tblock->filter_command)
3560 transport_filter_timeout = tblock->filter_timeout;
3562 /* On failure, copy the error to all addresses, abandon the SMTP call, and
3565 if (!transport_set_up_command(&transport_filter_argv,
3566 tblock->filter_command, TRUE, DEFER, addrlist,
3567 string_sprintf("%.50s transport", tblock->name), NULL))
3569 set_errno_nohost(addrlist->next, addrlist->basic_errno, addrlist->message, DEFER,
3570 FALSE, &sx->delivery_start);
3575 if ( transport_filter_argv
3576 && *transport_filter_argv
3577 && **transport_filter_argv
3578 && sx->peer_offered & OPTION_CHUNKING
3579 #ifndef DISABLE_DKIM
3580 /* When dkim signing, chunking is handled even with a transport-filter */
3581 && !(ob->dkim.dkim_private_key && ob->dkim.dkim_domain && ob->dkim.dkim_selector)
3582 && !ob->dkim.force_bodyhash
3586 sx->peer_offered &= ~OPTION_CHUNKING;
3587 DEBUG(D_transport) debug_printf("CHUNKING not usable due to transport filter\n");
3591 /* For messages that have more than the maximum number of envelope recipients,
3592 we want to send several transactions down the same SMTP connection. (See
3593 comments in deliver.c as to how this reconciles, heuristically, with
3594 remote_max_parallel.) This optimization was added to Exim after the following
3595 code was already working. The simplest way to put it in without disturbing the
3596 code was to use a goto to jump back to this point when there is another
3597 transaction to handle. */
3600 sx->from_addr = return_path;
3601 sx->sync_addr = sx->first_addr;
3603 sx->send_rset = TRUE;
3604 sx->completed_addr = FALSE;
3607 /* If we are a continued-connection-after-verify the MAIL and RCPT
3608 commands were already sent; do not re-send but do mark the addrs as
3609 having been accepted up to RCPT stage. A traditional cont-conn
3610 always has a sequence number greater than one. */
3612 if (continue_hostname && continue_sequence == 1)
3614 /* sx->pending_MAIL = FALSE; */
3616 /* sx->next_addr = NULL; */
3618 for (address_item * addr = addrlist; addr; addr = addr->next)
3619 addr->transport_return = PENDING_OK;
3623 /* Initiate a message transfer. */
3625 switch(smtp_write_mail_and_rcpt_cmds(sx, &yield))
3628 case -1: case -2: goto RESPONSE_FAILED;
3629 case -3: goto END_OFF;
3630 case -4: goto SEND_QUIT;
3631 default: goto SEND_FAILED;
3634 /* If we are an MUA wrapper, abort if any RCPTs were rejected, either
3635 permanently or temporarily. We should have flushed and synced after the last
3643 for (a = sx->first_addr, cnt = 0; a && cnt < sx->max_rcpt; a = a->next, cnt++)
3644 if (a->transport_return != PENDING_OK)
3646 /*XXX could we find a better errno than 0 here? */
3647 set_errno_nohost(addrlist, 0, a->message, FAIL,
3648 testflag(a, af_pass_message), &sx->delivery_start);
3655 /* If ok is TRUE, we know we have got at least one good recipient, and must now
3656 send DATA, but if it is FALSE (in the normal, non-wrapper case), we may still
3657 have a good recipient buffered up if we are pipelining. We don't want to waste
3658 time sending DATA needlessly, so we only send it if either ok is TRUE or if we
3659 are pipelining. The responses are all handled by sync_responses().
3660 If using CHUNKING, do not send a BDAT until we know how big a chunk we want
3663 if ( !(sx->peer_offered & OPTION_CHUNKING)
3664 && (sx->ok || (pipelining_active && !mua_wrapper)))
3666 int count = smtp_write_command(sx, SCMD_FLUSH, "DATA\r\n");
3668 if (count < 0) goto SEND_FAILED;
3669 switch(sync_responses(sx, count, sx->ok ? +1 : -1))
3671 case 3: sx->ok = TRUE; /* 2xx & 5xx => OK & progress made */
3672 case 2: sx->completed_addr = TRUE; /* 5xx (only) => progress made */
3675 case 1: sx->ok = TRUE; /* 2xx (only) => OK, but if LMTP, */
3676 if (!sx->lmtp) sx->completed_addr = TRUE; /* can't tell about progress yet */
3677 case 0: break; /* No 2xx or 5xx, but no probs */
3679 case -1: goto END_OFF; /* Timeout on RCPT */
3681 #ifndef DISABLE_PIPE_CONNECT
3682 case -5: /* TLS first-read error */
3683 case -4: HDEBUG(D_transport)
3684 debug_printf("failed reaping pipelined cmd responses\n");
3686 default: goto RESPONSE_FAILED; /* I/O error, or any MAIL/DATA error */
3688 pipelining_active = FALSE;
3689 data_command = string_copy(big_buffer); /* Save for later error message */
3692 /* If there were no good recipients (but otherwise there have been no
3693 problems), just set ok TRUE, since we have handled address-specific errors
3694 already. Otherwise, it's OK to send the message. Use the check/escape mechanism
3695 for handling the SMTP dot-handling protocol, flagging to apply to headers as
3696 well as body. Set the appropriate timeout value to be used for each chunk.
3697 (Haven't been able to make it work using select() for writing yet.) */
3700 && (!(sx->peer_offered & OPTION_CHUNKING) || !pipelining_active))
3702 /* Save the first address of the next batch. */
3703 sx->first_addr = sx->next_addr;
3709 transport_ctx tctx = {
3710 .u = {.fd = sx->cctx.sock}, /*XXX will this need TLS info? */
3713 .check_string = US".",
3714 .escape_string = US"..", /* Escaping strings */
3716 topt_use_crlf | topt_escape_headers
3717 | (tblock->body_only ? topt_no_headers : 0)
3718 | (tblock->headers_only ? topt_no_body : 0)
3719 | (tblock->return_path_add ? topt_add_return_path : 0)
3720 | (tblock->delivery_date_add ? topt_add_delivery_date : 0)
3721 | (tblock->envelope_to_add ? topt_add_envelope_to : 0)
3724 /* If using CHUNKING we need a callback from the generic transport
3725 support to us, for the sending of BDAT smtp commands and the reaping
3726 of responses. The callback needs a whole bunch of state so set up
3727 a transport-context structure to be passed around. */
3729 if (sx->peer_offered & OPTION_CHUNKING)
3731 tctx.check_string = tctx.escape_string = NULL;
3732 tctx.options |= topt_use_bdat;
3733 tctx.chunk_cb = smtp_chunk_cmd_callback;
3734 sx->pending_BDAT = FALSE;
3735 sx->good_RCPT = sx->ok;
3737 tctx.smtp_context = sx;
3740 tctx.options |= topt_end_dot;
3742 /* Save the first address of the next batch. */
3743 sx->first_addr = sx->next_addr;
3745 /* Responses from CHUNKING commands go in buffer. Otherwise,
3746 there has not been a response. */
3750 sigalrm_seen = FALSE;
3751 transport_write_timeout = ob->data_timeout;
3752 smtp_command = US"sending data block"; /* For error messages */
3753 DEBUG(D_transport|D_v)
3754 if (sx->peer_offered & OPTION_CHUNKING)
3755 debug_printf(" will write message using CHUNKING\n");
3757 debug_printf(" SMTP>> writing message and terminating \".\"\n");
3758 transport_count = 0;
3760 #ifndef DISABLE_DKIM
3762 # ifdef MEASURE_TIMING
3764 gettimeofday(&t0, NULL);
3766 dkim_exim_sign_init();
3767 # ifdef EXPERIMENTAL_ARC
3769 uschar * s = ob->arc_sign;
3772 if (!(ob->dkim.arc_signspec = s = expand_string(s)))
3774 if (!f.expand_string_forcedfail)
3776 message = US"failed to expand arc_sign";
3783 /* Ask dkim code to hash the body for ARC */
3784 (void) arc_ams_setup_sign_bodyhash();
3785 ob->dkim.force_bodyhash = TRUE;
3790 # ifdef MEASURE_TIMING
3791 report_time_since(&t0, US"dkim_exim_sign_init (delta)");
3794 sx->ok = dkim_transport_write_message(&tctx, &ob->dkim, CUSS &message);
3796 sx->ok = transport_write_message(&tctx, 0);
3799 /* transport_write_message() uses write() because it is called from other
3800 places to write to non-sockets. This means that under some OS (e.g. Solaris)
3801 it can exit with "Broken pipe" as its error. This really means that the
3802 socket got closed at the far end. */
3804 transport_write_timeout = 0; /* for subsequent transports */
3806 /* Failure can either be some kind of I/O disaster (including timeout),
3807 or the failure of a transport filter or the expansion of added headers.
3808 Or, when CHUNKING, it can be a protocol-detected failure. */
3811 if (message) goto SEND_FAILED;
3812 else goto RESPONSE_FAILED;
3814 /* We used to send the terminating "." explicitly here, but because of
3815 buffering effects at both ends of TCP/IP connections, you don't gain
3816 anything by keeping it separate, so it might as well go in the final
3817 data buffer for efficiency. This is now done by setting the topt_end_dot
3820 smtp_command = US"end of data";
3822 if (sx->peer_offered & OPTION_CHUNKING && sx->cmd_count > 1)
3824 /* Reap any outstanding MAIL & RCPT commands, but not a DATA-go-ahead */
3825 switch(sync_responses(sx, sx->cmd_count-1, 0))
3827 case 3: sx->ok = TRUE; /* 2xx & 5xx => OK & progress made */
3828 case 2: sx->completed_addr = TRUE; /* 5xx (only) => progress made */
3831 case 1: sx->ok = TRUE; /* 2xx (only) => OK, but if LMTP, */
3832 if (!sx->lmtp) sx->completed_addr = TRUE; /* can't tell about progress yet */
3833 case 0: break; /* No 2xx or 5xx, but no probs */
3835 case -1: goto END_OFF; /* Timeout on RCPT */
3837 #ifndef DISABLE_PIPE_CONNECT
3838 case -5: /* TLS first-read error */
3839 case -4: HDEBUG(D_transport)
3840 debug_printf("failed reaping pipelined cmd responses\n");
3842 default: goto RESPONSE_FAILED; /* I/O error, or any MAIL/DATA error */
3846 #ifndef DISABLE_PRDR
3847 /* For PRDR we optionally get a partial-responses warning followed by the
3848 individual responses, before going on with the overall response. If we don't
3849 get the warning then deal with per non-PRDR. */
3853 sx->ok = smtp_read_response(sx, sx->buffer, sizeof(sx->buffer), '3', ob->final_timeout);
3854 if (!sx->ok && errno == 0) switch(sx->buffer[0])
3856 case '2': sx->prdr_active = FALSE;
3859 case '4': errno = ERRNO_DATA4XX;
3860 addrlist->more_errno |=
3861 ((sx->buffer[1] - '0')*10 + sx->buffer[2] - '0') << 8;
3868 /* For non-PRDR SMTP, we now read a single response that applies to the
3869 whole message. If it is OK, then all the addresses have been delivered. */
3873 sx->ok = smtp_read_response(sx, sx->buffer, sizeof(sx->buffer), '2',
3875 if (!sx->ok && errno == 0 && sx->buffer[0] == '4')
3877 errno = ERRNO_DATA4XX;
3878 addrlist->more_errno |= ((sx->buffer[1] - '0')*10 + sx->buffer[2] - '0') << 8;
3882 /* For LMTP, we get back a response for every RCPT command that we sent;
3883 some may be accepted and some rejected. For those that get a response, their
3884 status is fixed; any that are accepted have been handed over, even if later
3885 responses crash - at least, that's how I read RFC 2033.
3887 If all went well, mark the recipient addresses as completed, record which
3888 host/IPaddress they were delivered to, and cut out RSET when sending another
3889 message down the same channel. Write the completed addresses to the journal
3890 now so that they are recorded in case there is a crash of hardware or
3891 software before the spool gets updated. Also record the final SMTP
3892 confirmation if needed (for SMTP only). */
3897 struct timeval delivery_time;
3899 uschar * conf = NULL;
3901 timesince(&delivery_time, &sx->delivery_start);
3902 sx->send_rset = FALSE;
3903 pipelining_active = FALSE;
3905 /* Set up confirmation if needed - applies only to SMTP */
3908 #ifdef DISABLE_EVENT
3909 LOGGING(smtp_confirmation) &&
3914 const uschar *s = string_printing(sx->buffer);
3915 /* deconst cast ok here as string_printing was checked to have alloc'n'copied */
3916 conf = (s == sx->buffer)? US string_copy(s) : US s;
3919 /* Process all transported addresses - for LMTP or PRDR, read a status for
3922 for (address_item * addr = addrlist; addr != sx->first_addr; addr = addr->next)
3924 if (addr->transport_return != PENDING_OK) continue;
3926 /* LMTP - if the response fails badly (e.g. timeout), use it for all the
3927 remaining addresses. Otherwise, it's a return code for just the one
3928 address. For temporary errors, add a retry item for the address so that
3929 it doesn't get tried again too soon. */
3931 #ifndef DISABLE_PRDR
3932 if (sx->lmtp || sx->prdr_active)
3937 if (!smtp_read_response(sx, sx->buffer, sizeof(sx->buffer), '2',
3940 if (errno != 0 || sx->buffer[0] == 0) goto RESPONSE_FAILED;
3941 addr->message = string_sprintf(
3942 #ifndef DISABLE_PRDR
3943 "%s error after %s: %s", sx->prdr_active ? "PRDR":"LMTP",
3945 "LMTP error after %s: %s",
3947 data_command, string_printing(sx->buffer));
3948 setflag(addr, af_pass_message); /* Allow message to go to user */
3949 if (sx->buffer[0] == '5')
3950 addr->transport_return = FAIL;
3953 errno = ERRNO_DATA4XX;
3954 addr->more_errno |= ((sx->buffer[1] - '0')*10 + sx->buffer[2] - '0') << 8;
3955 addr->transport_return = DEFER;
3956 #ifndef DISABLE_PRDR
3957 if (!sx->prdr_active)
3959 retry_add_item(addr, addr->address_retry_key, 0);
3963 sx->completed_addr = TRUE; /* NOW we can set this flag */
3964 if (LOGGING(smtp_confirmation))
3966 const uschar *s = string_printing(sx->buffer);
3967 /* deconst cast ok here as string_printing was checked to have alloc'n'copied */
3968 conf = (s == sx->buffer) ? US string_copy(s) : US s;
3972 /* SMTP, or success return from LMTP for this address. Pass back the
3973 actual host that was used. */
3975 addr->transport_return = OK;
3976 addr->host_used = host;
3977 addr->delivery_time = delivery_time;
3978 addr->special_action = flag;
3979 addr->message = conf;
3981 if (tcp_out_fastopen)
3983 setflag(addr, af_tcp_fastopen_conn);
3984 if (tcp_out_fastopen >= TFO_USED_NODATA) setflag(addr, af_tcp_fastopen);
3985 if (tcp_out_fastopen >= TFO_USED_DATA) setflag(addr, af_tcp_fastopen_data);
3987 if (sx->pipelining_used) setflag(addr, af_pipelining);
3988 #ifndef DISABLE_PIPE_CONNECT
3989 if (sx->early_pipe_active) setflag(addr, af_early_pipe);
3991 #ifndef DISABLE_PRDR
3992 if (sx->prdr_active) setflag(addr, af_prdr_used);
3994 if (sx->peer_offered & OPTION_CHUNKING) setflag(addr, af_chunking_used);
3997 #ifndef DISABLE_PRDR
3998 if (!sx->prdr_active)
4001 /* Update the journal. For homonymic addresses, use the base address plus
4002 the transport name. See lots of comments in deliver.c about the reasons
4003 for the complications when homonyms are involved. Just carry on after
4004 write error, as it may prove possible to update the spool file later. */
4006 if (testflag(addr, af_homonym))
4007 sprintf(CS sx->buffer, "%.500s/%s\n", addr->unique + 3, tblock->name);
4009 sprintf(CS sx->buffer, "%.500s\n", addr->unique);
4011 DEBUG(D_deliver) debug_printf("S:journalling %s\n", sx->buffer);
4012 len = Ustrlen(CS sx->buffer);
4013 if (write(journal_fd, sx->buffer, len) != len)
4014 log_write(0, LOG_MAIN|LOG_PANIC, "failed to write journal for "
4015 "%s: %s", sx->buffer, strerror(errno));
4019 #ifndef DISABLE_PRDR
4020 if (sx->prdr_active)
4022 const uschar * overall_message;
4024 /* PRDR - get the final, overall response. For any non-success
4025 upgrade all the address statuses. */
4027 sx->ok = smtp_read_response(sx, sx->buffer, sizeof(sx->buffer), '2',
4031 if(errno == 0 && sx->buffer[0] == '4')
4033 errno = ERRNO_DATA4XX;
4034 addrlist->more_errno |= ((sx->buffer[1] - '0')*10 + sx->buffer[2] - '0') << 8;
4036 for (address_item * addr = addrlist; addr != sx->first_addr; addr = addr->next)
4037 if (sx->buffer[0] == '5' || addr->transport_return == OK)
4038 addr->transport_return = PENDING_OK; /* allow set_errno action */
4039 goto RESPONSE_FAILED;
4042 /* Append the overall response to the individual PRDR response for logging
4043 and update the journal, or setup retry. */
4045 overall_message = string_printing(sx->buffer);
4046 for (address_item * addr = addrlist; addr != sx->first_addr; addr = addr->next)
4047 if (addr->transport_return == OK)
4048 addr->message = string_sprintf("%s\\n%s", addr->message, overall_message);
4050 for (address_item * addr = addrlist; addr != sx->first_addr; addr = addr->next)
4051 if (addr->transport_return == OK)
4053 if (testflag(addr, af_homonym))
4054 sprintf(CS sx->buffer, "%.500s/%s\n", addr->unique + 3, tblock->name);
4056 sprintf(CS sx->buffer, "%.500s\n", addr->unique);
4058 DEBUG(D_deliver) debug_printf("journalling(PRDR) %s\n", sx->buffer);
4059 len = Ustrlen(CS sx->buffer);
4060 if (write(journal_fd, sx->buffer, len) != len)
4061 log_write(0, LOG_MAIN|LOG_PANIC, "failed to write journal for "
4062 "%s: %s", sx->buffer, strerror(errno));
4064 else if (addr->transport_return == DEFER)
4065 retry_add_item(addr, addr->address_retry_key, -2);
4069 /* Ensure the journal file is pushed out to disk. */
4071 if (EXIMfsync(journal_fd) < 0)
4072 log_write(0, LOG_MAIN|LOG_PANIC, "failed to fsync journal: %s",
4078 /* Handle general (not specific to one address) failures here. The value of ok
4079 is used to skip over this code on the falling through case. A timeout causes a
4080 deferral. Other errors may defer or fail according to the response code, and
4081 may set up a special errno value, e.g. after connection chopped, which is
4082 assumed if errno == 0 and there is no text in the buffer. If control reaches
4083 here during the setting up phase (i.e. before MAIL FROM) then always defer, as
4084 the problem is not related to this specific message. */
4089 uschar * set_message;
4095 sx->send_quit = check_response(host, &save_errno, addrlist->more_errno,
4096 sx->buffer, &code, &message, &pass_message);
4104 message = string_sprintf("send() to %s [%s] failed: %s",
4105 host->name, host->address, message ? message : US strerror(save_errno));
4106 sx->send_quit = FALSE;
4114 sx->ok = FALSE; /* For when reached by GOTO */
4115 set_message = message;
4117 /* We want to handle timeouts after MAIL or "." and loss of connection after
4118 "." specially. They can indicate a problem with the sender address or with
4119 the contents of the message rather than a real error on the connection. These
4120 cases are treated in the same way as a 4xx response. This next bit of code
4121 does the classification. */
4128 message_error = TRUE;
4132 message_error = Ustrncmp(smtp_command,"MAIL",4) == 0 ||
4133 Ustrncmp(smtp_command,"end ",4) == 0;
4136 case ERRNO_SMTPCLOSED:
4137 message_error = Ustrncmp(smtp_command,"end ",4) == 0;
4141 message_error = FALSE;
4145 /* Handle the cases that are treated as message errors. These are:
4147 (a) negative response or timeout after MAIL
4148 (b) negative response after DATA
4149 (c) negative response or timeout or dropped connection after "."
4150 (d) utf8 support required and not offered
4152 It won't be a negative response or timeout after RCPT, as that is dealt
4153 with separately above. The action in all cases is to set an appropriate
4154 error code for all the addresses, but to leave yield set to OK because the
4155 host itself has not failed. Of course, it might in practice have failed
4156 when we've had a timeout, but if so, we'll discover that at the next
4157 delivery attempt. For a temporary error, set the message_defer flag, and
4158 write to the logs for information if this is not the last host. The error
4159 for the last host will be logged as part of the address's log line. */
4163 if (mua_wrapper) code = '5'; /* Force hard failure in wrapper mode */
4165 /* If there's an errno, the message contains just the identity of
4170 else /* Anything other than 5 is treated as temporary */
4174 message = US string_sprintf("%s: %s", message, strerror(save_errno));
4176 write_logs(host, message, sx->first_addr ? sx->first_addr->basic_errno : 0);
4178 *message_defer = TRUE;
4182 /* Otherwise, we have an I/O error or a timeout other than after MAIL or
4183 ".", or some other transportation error. We defer all addresses and yield
4184 DEFER, except for the case of failed add_headers expansion, or a transport
4185 filter failure, when the yield should be ERROR, to stop it trying other
4190 #ifndef DISABLE_PIPE_CONNECT
4191 /* If we were early-pipelinng and the actual EHLO response did not match
4192 the cached value we assumed, we could have detected it and passed a
4193 custom errno through to here. It would be nice to RSET and retry right
4194 away, but to reliably do that we eould need an extra synch point before
4195 we committed to data and that would discard half the gained roundrips.
4196 Or we could summarily drop the TCP connection. but that is also ugly.
4197 Instead, we ignore the possibility (having freshened the cache) and rely
4198 on the server telling us with a nonmessage error if we have tried to
4199 do something it no longer supports. */
4202 yield = (save_errno == ERRNO_CHHEADER_FAIL ||
4203 save_errno == ERRNO_FILTER_FAIL) ? ERROR : DEFER;
4207 set_errno(addrlist, save_errno, set_message, set_rc, pass_message, host,
4208 #ifdef EXPERIMENTAL_DSN_INFO
4209 sx->smtp_greeting, sx->helo_response,
4211 &sx->delivery_start);
4214 /* If all has gone well, send_quit will be set TRUE, implying we can end the
4215 SMTP session tidily. However, if there were too many addresses to send in one
4216 message (indicated by first_addr being non-NULL) we want to carry on with the
4217 rest of them. Also, it is desirable to send more than one message down the SMTP
4218 connection if there are several waiting, provided we haven't already sent so
4219 many as to hit the configured limit. The function transport_check_waiting looks
4220 for a waiting message and returns its id. Then transport_pass_socket tries to
4221 set up a continued delivery by passing the socket on to another process. The
4222 variable send_rset is FALSE if a message has just been successfully transferred.
4224 If we are already sending down a continued channel, there may be further
4225 addresses not yet delivered that are aimed at the same host, but which have not
4226 been passed in this run of the transport. In this case, continue_more will be
4227 true, and all we should do is send RSET if necessary, and return, leaving the
4230 However, if no address was disposed of, i.e. all addresses got 4xx errors, we
4231 do not want to continue with other messages down the same channel, because that
4232 can lead to looping between two or more messages, all with the same,
4233 temporarily failing address(es). [The retry information isn't updated yet, so
4234 new processes keep on trying.] We probably also don't want to try more of this
4235 message's addresses either.
4237 If we have started a TLS session, we have to end it before passing the
4238 connection to a new process. However, not all servers can handle this (Exim
4239 can), so we do not pass such a connection on if the host matches
4240 hosts_nopass_tls. */
4243 debug_printf("ok=%d send_quit=%d send_rset=%d continue_more=%d "
4244 "yield=%d first_address is %sNULL\n", sx->ok, sx->send_quit,
4245 sx->send_rset, f.continue_more, yield, sx->first_addr ? "not " : "");
4247 if (sx->completed_addr && sx->ok && sx->send_quit)
4250 smtp_compare_t t_compare;
4252 t_compare.tblock = tblock;
4253 t_compare.current_sender_address = sender_address;
4255 if ( sx->first_addr != NULL /* more addrs for this message */
4256 || f.continue_more /* more addrs for coninued-host */
4259 ( tls_out.active.sock < 0 && !continue_proxy_cipher
4260 || verify_check_given_host(CUSS &ob->hosts_nopass_tls, host) != OK
4264 transport_check_waiting(tblock->name, host->name,
4265 tblock->connection_max_messages, new_message_id, &more,
4266 (oicf)smtp_are_same_identities, (void*)&t_compare)
4273 if (! (sx->ok = smtp_write_command(sx, SCMD_FLUSH, "RSET\r\n") >= 0))
4275 msg = US string_sprintf("send() to %s [%s] failed: %s", host->name,
4276 host->address, strerror(errno));
4277 sx->send_quit = FALSE;
4279 else if (! (sx->ok = smtp_read_response(sx, sx->buffer, sizeof(sx->buffer),
4280 '2', ob->command_timeout)))
4283 sx->send_quit = check_response(host, &errno, 0, sx->buffer, &code, &msg,
4287 DEBUG(D_transport) debug_printf("H=%s [%s] %s\n",
4288 host->name, host->address, msg);
4292 /* Either RSET was not needed, or it succeeded */
4299 int socket_fd = sx->cctx.sock;
4302 if (sx->first_addr != NULL) /* More addresses still to be sent */
4303 { /* for this message */
4304 continue_sequence++; /* Causes * in logging */
4305 pipelining_active = sx->pipelining_used; /* was cleared at DATA */
4309 /* Unless caller said it already has more messages listed for this host,
4310 pass the connection on to a new Exim process (below, the call to
4311 transport_pass_socket). If the caller has more ready, just return with
4312 the connection still open. */
4315 if (tls_out.active.sock >= 0)
4316 if ( f.continue_more
4317 || verify_check_given_host(CUSS &ob->hosts_noproxy_tls, host) == OK)
4319 /* Before passing the socket on, or returning to caller with it still
4320 open, we must shut down TLS. Not all MTAs allow for the continuation
4321 of the SMTP session when TLS is shut down. We test for this by sending
4322 a new EHLO. If we don't get a good response, we don't attempt to pass
4325 tls_close(sx->cctx.tls_ctx, TLS_SHUTDOWN_WAIT);
4326 sx->cctx.tls_ctx = NULL;
4327 tls_out.active.sock = -1;
4328 smtp_peer_options = smtp_peer_options_wrap;
4330 && smtp_write_command(sx, SCMD_FLUSH, "EHLO %s\r\n", sx->helo_data)
4332 && smtp_read_response(sx, sx->buffer, sizeof(sx->buffer),
4333 '2', ob->command_timeout);
4335 if (sx->ok && f.continue_more)
4336 goto TIDYUP; /* More addresses for another run */
4340 /* Set up a pipe for proxying TLS for the new transport process */
4342 smtp_peer_options |= OPTION_TLS;
4343 if ((sx->ok = socketpair(AF_UNIX, SOCK_STREAM, 0, pfd) == 0))
4346 set_errno(sx->first_addr, errno, US"internal allocation problem",
4348 # ifdef EXPERIMENTAL_DSN_INFO
4349 sx->smtp_greeting, sx->helo_response,
4351 &sx->delivery_start);
4355 if (f.continue_more)
4356 goto TIDYUP; /* More addresses for another run */
4358 /* If the socket is successfully passed, we mustn't send QUIT (or
4359 indeed anything!) from here. */
4361 /*XXX DSN_INFO: assume likely to do new HELO; but for greet we'll want to
4362 propagate it from the initial
4364 if (sx->ok && transport_pass_socket(tblock->name, host->name,
4365 host->address, new_message_id, socket_fd))
4367 sx->send_quit = FALSE;
4369 /* We have passed the client socket to a fresh transport process.
4370 If TLS is still active, we need to proxy it for the transport we
4371 just passed the baton to. Fork a child to to do it, and return to
4372 get logging done asap. Which way to place the work makes assumptions
4373 about post-fork prioritisation which may not hold on all platforms. */
4375 if (tls_out.active.sock >= 0)
4377 int pid = exim_fork(US"tls-proxy-interproc");
4378 if (pid == 0) /* child; fork again to disconnect totally */
4380 /* does not return */
4381 smtp_proxy_tls(sx->cctx.tls_ctx, sx->buffer, sizeof(sx->buffer), pfd,
4382 ob->command_timeout);
4385 if (pid > 0) /* parent */
4388 /* tidy the inter-proc to disconn the proxy proc */
4389 waitpid(pid, NULL, 0);
4390 tls_close(sx->cctx.tls_ctx, TLS_NO_SHUTDOWN);
4391 sx->cctx.tls_ctx = NULL;
4392 (void)close(sx->cctx.sock);
4394 continue_transport = NULL;
4395 continue_hostname = NULL;
4398 log_write(0, LOG_PANIC_DIE, "fork failed");
4404 /* If RSET failed and there are addresses left, they get deferred. */
4406 set_errno(sx->first_addr, errno, msg, DEFER, FALSE, host,
4407 #ifdef EXPERIMENTAL_DSN_INFO
4408 sx->smtp_greeting, sx->helo_response,
4410 &sx->delivery_start);
4414 /* End off tidily with QUIT unless the connection has died or the socket has
4415 been passed to another process. There has been discussion on the net about what
4416 to do after sending QUIT. The wording of the RFC suggests that it is necessary
4417 to wait for a response, but on the other hand, there isn't anything one can do
4418 with an error response, other than log it. Exim used to do that. However,
4419 further discussion suggested that it is positively advantageous not to wait for
4420 the response, but to close the session immediately. This is supposed to move
4421 the TCP/IP TIME_WAIT state from the server to the client, thereby removing some
4422 load from the server. (Hosts that are both servers and clients may not see much
4423 difference, of course.) Further discussion indicated that this was safe to do
4424 on Unix systems which have decent implementations of TCP/IP that leave the
4425 connection around for a while (TIME_WAIT) after the application has gone away.
4426 This enables the response sent by the server to be properly ACKed rather than
4427 timed out, as can happen on broken TCP/IP implementations on other OS.
4429 This change is being made on 31-Jul-98. After over a year of trouble-free
4430 operation, the old commented-out code was removed on 17-Sep-99. */
4434 (void) setsockopt(sx->cctx.sock, IPPROTO_TCP, TCP_CORK, US &on, sizeof(on));
4436 if (sx->send_quit) (void)smtp_write_command(sx, SCMD_FLUSH, "QUIT\r\n");
4441 tls_close(sx->cctx.tls_ctx, TLS_SHUTDOWN_NOWAIT);
4442 sx->cctx.tls_ctx = NULL;
4445 /* Close the socket, and return the appropriate value, first setting
4446 works because the NULL setting is passed back to the calling process, and
4447 remote_max_parallel is forced to 1 when delivering over an existing connection,
4449 If all went well and continue_more is set, we shouldn't actually get here if
4450 there are further addresses, as the return above will be taken. However,
4451 writing RSET might have failed, or there may be other addresses whose hosts are
4452 specified in the transports, and therefore not visible at top level, in which
4453 case continue_more won't get set. */
4455 HDEBUG(D_transport|D_acl|D_v) debug_printf_indent(" SMTP(close)>>\n");
4458 shutdown(sx->cctx.sock, SHUT_WR);
4460 testharness_pause_ms(200);
4461 if (fcntl(sx->cctx.sock, F_SETFL, O_NONBLOCK) == 0)
4462 for (int i = 16; read(sx->cctx.sock, sx->inbuffer, sizeof(sx->inbuffer)) > 0 && i > 0;)
4463 i--; /* drain socket */
4465 (void)close(sx->cctx.sock);
4467 #ifndef DISABLE_EVENT
4468 (void) event_raise(tblock->event_action, US"tcp:close", NULL);
4474 sx->first_addr = NULL;
4475 for (address_item * a = sx->addrlist->next; a; a = a->next)
4476 if (a->transport_return == DANE)
4478 a->transport_return = PENDING_DEFER;
4479 if (!sx->first_addr)
4481 /* Remember the new start-point in the addrlist, for smtp_setup_conn()
4482 to get the domain string for SNI */
4485 DEBUG(D_transport) debug_printf("DANE: go-around for %s\n", a->domain);
4492 continue_transport = NULL;
4493 continue_hostname = NULL;
4498 if (dane_held) for (address_item * a = sx->addrlist->next; a; a = a->next)
4499 if (a->transport_return == DANE)
4500 a->transport_return = PENDING_DEFER;
4508 /*************************************************
4509 * Closedown entry point *
4510 *************************************************/
4512 /* This function is called when exim is passed an open smtp channel
4513 from another incarnation, but the message which it has been asked
4514 to deliver no longer exists. The channel is on stdin.
4516 We might do fancy things like looking for another message to send down
4517 the channel, but if the one we sought has gone, it has probably been
4518 delivered by some other process that itself will seek further messages,
4519 so just close down our connection.
4521 Argument: pointer to the transport instance block
4526 smtp_transport_closedown(transport_instance *tblock)
4528 smtp_transport_options_block * ob = SOB tblock->options_block;
4529 client_conn_ctx cctx;
4532 uschar inbuffer[4096];
4533 uschar outbuffer[16];
4535 /*XXX really we need an active-smtp-client ctx, rather than assuming stdout */
4536 cctx.sock = fileno(stdin);
4537 cctx.tls_ctx = cctx.sock == tls_out.active.sock ? tls_out.active.tls_ctx : NULL;
4539 sx.inblock.cctx = &cctx;
4540 sx.inblock.buffer = inbuffer;
4541 sx.inblock.buffersize = sizeof(inbuffer);
4542 sx.inblock.ptr = inbuffer;
4543 sx.inblock.ptrend = inbuffer;
4545 sx.outblock.cctx = &cctx;
4546 sx.outblock.buffersize = sizeof(outbuffer);
4547 sx.outblock.buffer = outbuffer;
4548 sx.outblock.ptr = outbuffer;
4549 sx.outblock.cmd_count = 0;
4550 sx.outblock.authenticating = FALSE;
4552 (void)smtp_write_command(&sx, SCMD_FLUSH, "QUIT\r\n");
4553 (void)smtp_read_response(&sx, buffer, sizeof(buffer), '2', ob->command_timeout);
4554 (void)close(cctx.sock);
4559 /*************************************************
4560 * Prepare addresses for delivery *
4561 *************************************************/
4563 /* This function is called to flush out error settings from previous delivery
4564 attempts to other hosts. It also records whether we got here via an MX record
4565 or not in the more_errno field of the address. We are interested only in
4566 addresses that are still marked DEFER - others may have got delivered to a
4567 previously considered IP address. Set their status to PENDING_DEFER to indicate
4568 which ones are relevant this time.
4571 addrlist the list of addresses
4572 host the host we are delivering to
4574 Returns: the first address for this delivery
4577 static address_item *
4578 prepare_addresses(address_item *addrlist, host_item *host)
4580 address_item *first_addr = NULL;
4581 for (address_item * addr = addrlist; addr; addr = addr->next)
4582 if (addr->transport_return == DEFER)
4584 if (!first_addr) first_addr = addr;
4585 addr->transport_return = PENDING_DEFER;
4586 addr->basic_errno = 0;
4587 addr->more_errno = (host->mx >= 0)? 'M' : 'A';
4588 addr->message = NULL;
4590 addr->cipher = NULL;
4591 addr->ourcert = NULL;
4592 addr->peercert = NULL;
4593 addr->peerdn = NULL;
4594 addr->ocsp = OCSP_NOT_REQ;
4595 addr->tlsver = NULL;
4597 #ifdef EXPERIMENTAL_DSN_INFO
4598 addr->smtp_greeting = NULL;
4599 addr->helo_response = NULL;
4607 /*************************************************
4608 * Main entry point *
4609 *************************************************/
4611 /* See local README for interface details. As this is a remote transport, it is
4612 given a chain of addresses to be delivered in one connection, if possible. It
4613 always returns TRUE, indicating that each address has its own independent
4614 status set, except if there is a setting up problem, in which case it returns
4618 smtp_transport_entry(
4619 transport_instance *tblock, /* data for this instantiation */
4620 address_item *addrlist) /* addresses we are working on */
4623 int hosts_defer = 0;
4625 int hosts_looked_up = 0;
4626 int hosts_retry = 0;
4627 int hosts_serial = 0;
4628 int hosts_total = 0;
4629 int total_hosts_tried = 0;
4630 BOOL expired = TRUE;
4631 uschar *expanded_hosts = NULL;
4633 uschar *tid = string_sprintf("%s transport", tblock->name);
4634 smtp_transport_options_block *ob = SOB tblock->options_block;
4635 host_item *hostlist = addrlist->host_list;
4636 host_item *host = NULL;
4640 debug_printf("%s transport entered\n", tblock->name);
4641 for (address_item * addr = addrlist; addr; addr = addr->next)
4642 debug_printf(" %s\n", addr->address);
4645 debug_printf("hostlist:\n");
4646 for (host_item * host = hostlist; host; host = host->next)
4647 debug_printf(" '%s' IP %s port %d\n", host->name, host->address, host->port);
4649 if (continue_hostname)
4650 debug_printf("already connected to %s [%s] (on fd %d)\n",
4651 continue_hostname, continue_host_address,
4652 cutthrough.cctx.sock >= 0 ? cutthrough.cctx.sock : 0);
4655 /* Set the flag requesting that these hosts be added to the waiting
4656 database if the delivery fails temporarily or if we are running with
4657 queue_smtp or a 2-stage queue run. This gets unset for certain
4658 kinds of error, typically those that are specific to the message. */
4660 update_waiting = TRUE;
4662 /* If a host list is not defined for the addresses - they must all have the
4663 same one in order to be passed to a single transport - or if the transport has
4664 a host list with hosts_override set, use the host list supplied with the
4665 transport. It is an error for this not to exist. */
4667 if (!hostlist || (ob->hosts_override && ob->hosts))
4671 addrlist->message = string_sprintf("%s transport called with no hosts set",
4673 addrlist->transport_return = PANIC;
4674 return FALSE; /* Only top address has status */
4677 DEBUG(D_transport) debug_printf("using the transport's hosts: %s\n",
4680 /* If the transport's host list contains no '$' characters, and we are not
4681 randomizing, it is fixed and therefore a chain of hosts can be built once
4682 and for all, and remembered for subsequent use by other calls to this
4683 transport. If, on the other hand, the host list does contain '$', or we are
4684 randomizing its order, we have to rebuild it each time. In the fixed case,
4685 as the hosts string will never be used again, it doesn't matter that we
4686 replace all the : characters with zeros. */
4690 uschar *s = ob->hosts;
4692 if (Ustrchr(s, '$') != NULL)
4694 if (!(expanded_hosts = expand_string(s)))
4696 addrlist->message = string_sprintf("failed to expand list of hosts "
4697 "\"%s\" in %s transport: %s", s, tblock->name, expand_string_message);
4698 addrlist->transport_return = f.search_find_defer ? DEFER : PANIC;
4699 return FALSE; /* Only top address has status */
4701 DEBUG(D_transport) debug_printf("expanded list of hosts \"%s\" to "
4702 "\"%s\"\n", s, expanded_hosts);
4706 if (ob->hosts_randomize) s = expanded_hosts = string_copy(s);
4710 log_write(0, LOG_MAIN|LOG_PANIC,
4711 "attempt to use tainted host list '%s' from '%s' in transport %s",
4712 s, ob->hosts, tblock->name);
4713 /* Avoid leaking info to an attacker */
4714 addrlist->message = US"internal configuration error";
4715 addrlist->transport_return = PANIC;
4719 host_build_hostlist(&hostlist, s, ob->hosts_randomize);
4721 /* Check that the expansion yielded something useful. */
4725 string_sprintf("%s transport has empty hosts setting", tblock->name);
4726 addrlist->transport_return = PANIC;
4727 return FALSE; /* Only top address has status */
4730 /* If there was no expansion of hosts, save the host list for
4733 if (!expanded_hosts) ob->hostlist = hostlist;
4736 /* This is not the first time this transport has been run in this delivery;
4737 the host list was built previously. */
4740 hostlist = ob->hostlist;
4743 /* The host list was supplied with the address. If hosts_randomize is set, we
4744 must sort it into a random order if it did not come from MX records and has not
4745 already been randomized (but don't bother if continuing down an existing
4748 else if (ob->hosts_randomize && hostlist->mx == MX_NONE && !continue_hostname)
4750 host_item *newlist = NULL;
4753 host_item *h = hostlist;
4754 hostlist = hostlist->next;
4756 h->sort_key = random_number(100);
4763 else if (h->sort_key < newlist->sort_key)
4770 host_item *hh = newlist;
4773 if (h->sort_key < hh->next->sort_key) break;
4781 hostlist = addrlist->host_list = newlist;
4784 /* Sort out the default port. */
4786 if (!smtp_get_port(ob->port, addrlist, &defport, tid)) return FALSE;
4788 /* For each host-plus-IP-address on the list:
4790 . If this is a continued delivery and the host isn't the one with the
4791 current connection, skip.
4793 . If the status is unusable (i.e. previously failed or retry checked), skip.
4795 . If no IP address set, get the address, either by turning the name into
4796 an address, calling gethostbyname if gethostbyname is on, or by calling
4797 the DNS. The DNS may yield multiple addresses, in which case insert the
4798 extra ones into the list.
4800 . Get the retry data if not previously obtained for this address and set the
4801 field which remembers the state of this address. Skip if the retry time is
4802 not reached. If not, remember whether retry data was found. The retry string
4803 contains both the name and the IP address.
4805 . Scan the list of addresses and mark those whose status is DEFER as
4806 PENDING_DEFER. These are the only ones that will be processed in this cycle
4809 . Make a delivery attempt - addresses marked PENDING_DEFER will be tried.
4810 Some addresses may be successfully delivered, others may fail, and yet
4811 others may get temporary errors and so get marked DEFER.
4813 . The return from the delivery attempt is OK if a connection was made and a
4814 valid SMTP dialogue was completed. Otherwise it is DEFER.
4816 . If OK, add a "remove" retry item for this host/IPaddress, if any.
4818 . If fail to connect, or other defer state, add a retry item.
4820 . If there are any addresses whose status is still DEFER, carry on to the
4821 next host/IPaddress, unless we have tried the number of hosts given
4822 by hosts_max_try or hosts_max_try_hardlimit; otherwise return. Note that
4823 there is some fancy logic for hosts_max_try that means its limit can be
4824 overstepped in some circumstances.
4826 If we get to the end of the list, all hosts have deferred at least one address,
4827 or not reached their retry times. If delay_after_cutoff is unset, it requests a
4828 delivery attempt to those hosts whose last try was before the arrival time of
4829 the current message. To cope with this, we have to go round the loop a second
4830 time. After that, set the status and error data for any addresses that haven't
4831 had it set already. */
4833 for (int cutoff_retry = 0;
4834 expired && cutoff_retry < (ob->delay_after_cutoff ? 1 : 2);
4837 host_item *nexthost = NULL;
4838 int unexpired_hosts_tried = 0;
4839 BOOL continue_host_tried = FALSE;
4841 retry_non_continued:
4842 for (host = hostlist;
4844 && unexpired_hosts_tried < ob->hosts_max_try
4845 && total_hosts_tried < ob->hosts_max_try_hardlimit;
4850 BOOL host_is_expired = FALSE;
4851 BOOL message_defer = FALSE;
4852 BOOL some_deferred = FALSE;
4853 address_item *first_addr = NULL;
4854 uschar *interface = NULL;
4855 uschar *retry_host_key = NULL;
4856 uschar *retry_message_key = NULL;
4857 uschar *serialize_key = NULL;
4859 /* Default next host is next host. :-) But this can vary if the
4860 hosts_max_try limit is hit (see below). It may also be reset if a host
4861 address is looked up here (in case the host was multihomed). */
4863 nexthost = host->next;
4865 /* If the address hasn't yet been obtained from the host name, look it up
4866 now, unless the host is already marked as unusable. If it is marked as
4867 unusable, it means that the router was unable to find its IP address (in
4868 the DNS or wherever) OR we are in the 2nd time round the cutoff loop, and
4869 the lookup failed last time. We don't get this far if *all* MX records
4870 point to non-existent hosts; that is treated as a hard error.
4872 We can just skip this host entirely. When the hosts came from the router,
4873 the address will timeout based on the other host(s); when the address is
4874 looked up below, there is an explicit retry record added.
4876 Note that we mustn't skip unusable hosts if the address is not unset; they
4877 may be needed as expired hosts on the 2nd time round the cutoff loop. */
4881 int new_port, flags;
4883 if (host->status >= hstatus_unusable)
4885 DEBUG(D_transport) debug_printf("%s has no address and is unusable - skipping\n",
4890 DEBUG(D_transport) debug_printf("getting address for %s\n", host->name);
4892 /* The host name is permitted to have an attached port. Find it, and
4893 strip it from the name. Just remember it for now. */
4895 new_port = host_item_get_port(host);
4897 /* Count hosts looked up */
4901 /* Find by name if so configured, or if it's an IP address. We don't
4902 just copy the IP address, because we need the test-for-local to happen. */
4904 flags = HOST_FIND_BY_A | HOST_FIND_BY_AAAA;
4905 if (ob->dns_qualify_single) flags |= HOST_FIND_QUALIFY_SINGLE;
4906 if (ob->dns_search_parents) flags |= HOST_FIND_SEARCH_PARENTS;
4908 if (ob->gethostbyname || string_is_ip_address(host->name, NULL) != 0)
4909 rc = host_find_byname(host, NULL, flags, NULL, TRUE);
4911 rc = host_find_bydns(host, NULL, flags, NULL, NULL, NULL,
4912 &ob->dnssec, /* domains for request/require */
4915 /* Update the host (and any additional blocks, resulting from
4916 multihoming) with a host-specific port, if any. */
4918 for (host_item * hh = host; hh != nexthost; hh = hh->next) hh->port = new_port;
4920 /* Failure to find the host at this time (usually DNS temporary failure)
4921 is really a kind of routing failure rather than a transport failure.
4922 Therefore we add a retry item of the routing kind, not to stop us trying
4923 to look this name up here again, but to ensure the address gets timed
4924 out if the failures go on long enough. A complete failure at this point
4925 commonly points to a configuration error, but the best action is still
4926 to carry on for the next host. */
4928 if (rc == HOST_FIND_AGAIN || rc == HOST_FIND_SECURITY || rc == HOST_FIND_FAILED)
4930 retry_add_item(addrlist, string_sprintf("R:%s", host->name), 0);
4932 if (rc == HOST_FIND_AGAIN) hosts_defer++; else hosts_fail++;
4933 DEBUG(D_transport) debug_printf("rc = %s for %s\n", (rc == HOST_FIND_AGAIN)?
4934 "HOST_FIND_AGAIN" : "HOST_FIND_FAILED", host->name);
4935 host->status = hstatus_unusable;
4937 for (address_item * addr = addrlist; addr; addr = addr->next)
4939 if (addr->transport_return != DEFER) continue;
4940 addr->basic_errno = ERRNO_UNKNOWNHOST;
4941 addr->message = string_sprintf(
4942 rc == HOST_FIND_SECURITY
4943 ? "lookup of IP address for %s was insecure"
4944 : "failed to lookup IP address for %s",
4950 /* If the host is actually the local host, we may have a problem, or
4951 there may be some cunning configuration going on. In the problem case,
4952 log things and give up. The default transport status is already DEFER. */
4954 if (rc == HOST_FOUND_LOCAL && !ob->allow_localhost)
4956 for (address_item * addr = addrlist; addr; addr = addr->next)
4958 addr->basic_errno = ERRNO_HOST_IS_LOCAL;
4959 addr->message = string_sprintf("%s transport found host %s to be "
4960 "local", tblock->name, host->name);
4964 } /* End of block for IP address lookup */
4966 /* If this is a continued delivery, we are interested only in the host
4967 which matches the name of the existing open channel. The check is put
4968 here after the local host lookup, in case the name gets expanded as a
4969 result of the lookup. Set expired FALSE, to save the outer loop executing
4972 if (continue_hostname)
4973 if ( Ustrcmp(continue_hostname, host->name) != 0
4974 || Ustrcmp(continue_host_address, host->address) != 0
4978 continue; /* With next host */
4981 continue_host_tried = TRUE;
4983 /* Reset the default next host in case a multihomed host whose addresses
4984 are not looked up till just above added to the host list. */
4986 nexthost = host->next;
4988 /* If queue_smtp is set (-odqs or the first part of a 2-stage run), or the
4989 domain is in queue_smtp_domains, we don't actually want to attempt any
4990 deliveries. When doing a queue run, queue_smtp_domains is always unset. If
4991 there is a lookup defer in queue_smtp_domains, proceed as if the domain
4992 were not in it. We don't want to hold up all SMTP deliveries! Except when
4993 doing a two-stage queue run, don't do this if forcing. */
4995 if ( (!f.deliver_force || f.queue_2stage)
4997 || match_isinlist(addrlist->domain,
4998 CUSS &queue_smtp_domains, 0,
4999 &domainlist_anchor, NULL, MCL_DOMAIN, TRUE, NULL) == OK)
5002 DEBUG(D_transport) debug_printf("first-pass routing only\n");
5004 for (address_item * addr = addrlist; addr; addr = addr->next)
5005 if (addr->transport_return == DEFER)
5006 addr->message = US"first-pass only routing due to -odqs, "
5007 "queue_smtp_domains or control=queue";
5008 continue; /* With next host */
5011 /* Count hosts being considered - purely for an intelligent comment
5012 if none are usable. */
5016 /* Set $host and $host address now in case they are needed for the
5017 interface expansion or the serialize_hosts check; they remain set if an
5018 actual delivery happens. */
5020 deliver_host = host->name;
5021 deliver_host_address = host->address;
5022 lookup_dnssec_authenticated = host->dnssec == DS_YES ? US"yes"
5023 : host->dnssec == DS_NO ? US"no"
5026 /* Set up a string for adding to the retry key if the port number is not
5027 the standard SMTP port. A host may have its own port setting that overrides
5030 pistring = string_sprintf(":%d", host->port == PORT_NONE
5031 ? defport : host->port);
5032 if (Ustrcmp(pistring, ":25") == 0) pistring = US"";
5034 /* Select IPv4 or IPv6, and choose an outgoing interface. If the interface
5035 string is set, even if constant (as different transports can have different
5036 constant settings), we must add it to the key that is used for retries,
5037 because connections to the same host from a different interface should be
5038 treated separately. */
5040 host_af = Ustrchr(host->address, ':') == NULL ? AF_INET : AF_INET6;
5042 uschar * s = ob->interface;
5045 if (!smtp_get_interface(s, host_af, addrlist, &interface, tid))
5047 pistring = string_sprintf("%s/%s", pistring, interface);
5051 /* The first time round the outer loop, check the status of the host by
5052 inspecting the retry data. The second time round, we are interested only
5053 in expired hosts that haven't been tried since this message arrived. */
5055 if (cutoff_retry == 0)
5058 /* Ensure the status of the address is set by checking retry data if
5059 necessary. There may be host-specific retry data (applicable to all
5060 messages) and also data for retries of a specific message at this host.
5061 If either of these retry records are actually read, the keys used are
5062 returned to save recomputing them later. */
5064 if (exp_bool(addrlist, US"transport", tblock->name, D_transport,
5065 US"retry_include_ip_address", ob->retry_include_ip_address,
5066 ob->expand_retry_include_ip_address, &incl_ip) != OK)
5067 continue; /* with next host */
5069 host_is_expired = retry_check_address(addrlist->domain, host, pistring,
5070 incl_ip, &retry_host_key, &retry_message_key);
5072 DEBUG(D_transport) debug_printf("%s [%s]%s retry-status = %s\n", host->name,
5073 host->address ? host->address : US"", pistring,
5074 host->status == hstatus_usable ? "usable"
5075 : host->status == hstatus_unusable ? "unusable"
5076 : host->status == hstatus_unusable_expired ? "unusable (expired)" : "?");
5078 /* Skip this address if not usable at this time, noting if it wasn't
5079 actually expired, both locally and in the address. */
5081 switch (host->status)
5083 case hstatus_unusable:
5085 setflag(addrlist, af_retry_skipped);
5088 case hstatus_unusable_expired:
5091 case hwhy_retry: hosts_retry++; break;
5092 case hwhy_failed: hosts_fail++; break;
5094 case hwhy_deferred: hosts_defer++; break;
5097 /* If there was a retry message key, implying that previously there
5098 was a message-specific defer, we don't want to update the list of
5099 messages waiting for these hosts. */
5101 if (retry_message_key) update_waiting = FALSE;
5102 continue; /* With the next host or IP address */
5106 /* Second time round the loop: if the address is set but expired, and
5107 the message is newer than the last try, let it through. */
5112 || host->status != hstatus_unusable_expired
5113 || host->last_try > received_time.tv_sec)
5115 DEBUG(D_transport) debug_printf("trying expired host %s [%s]%s\n",
5116 host->name, host->address, pistring);
5117 host_is_expired = TRUE;
5120 /* Setting "expired=FALSE" doesn't actually mean not all hosts are expired;
5121 it remains TRUE only if all hosts are expired and none are actually tried.
5126 /* If this host is listed as one to which access must be serialized,
5127 see if another Exim process has a connection to it, and if so, skip
5128 this host. If not, update the database to record our connection to it
5129 and remember this for later deletion. Do not do any of this if we are
5130 sending the message down a pre-existing connection. */
5132 if ( !continue_hostname
5133 && verify_check_given_host(CUSS &ob->serialize_hosts, host) == OK)
5135 serialize_key = string_sprintf("host-serialize-%s", host->name);
5136 if (!enq_start(serialize_key, 1))
5139 debug_printf("skipping host %s because another Exim process "
5140 "is connected to it\n", host->name);
5146 /* OK, we have an IP address that is not waiting for its retry time to
5147 arrive (it might be expired) OR (second time round the loop) we have an
5148 expired host that hasn't been tried since the message arrived. Have a go
5149 at delivering the message to it. First prepare the addresses by flushing
5150 out the result of previous attempts, and finding the first address that
5151 is still to be delivered. */
5153 first_addr = prepare_addresses(addrlist, host);
5155 DEBUG(D_transport) debug_printf("delivering %s to %s [%s] (%s%s)\n",
5156 message_id, host->name, host->address, addrlist->address,
5157 addrlist->next ? ", ..." : "");
5159 set_process_info("delivering %s to %s [%s]%s (%s%s)",
5160 message_id, host->name, host->address, pistring, addrlist->address,
5161 addrlist->next ? ", ..." : "");
5163 /* This is not for real; don't do the delivery. If there are
5164 any remaining hosts, list them. */
5169 gettimeofday(&now, NULL);
5170 set_errno_nohost(addrlist, 0, NULL, OK, FALSE, &now);
5171 for (address_item * addr = addrlist; addr; addr = addr->next)
5173 addr->host_used = host;
5174 addr->special_action = '*';
5175 addr->message = US"delivery bypassed by -N option";
5179 debug_printf("*** delivery by %s transport bypassed by -N option\n"
5180 "*** host and remaining hosts:\n", tblock->name);
5181 for (host_item * host2 = host; host2; host2 = host2->next)
5182 debug_printf(" %s [%s]\n", host2->name,
5183 host2->address ? host2->address : US"unset");
5188 /* This is for real. If the host is expired, we don't count it for
5189 hosts_max_retry. This ensures that all hosts must expire before an address
5190 is timed out, unless hosts_max_try_hardlimit (which protects against
5191 lunatic DNS configurations) is reached.
5193 If the host is not expired and we are about to hit the hosts_max_retry
5194 limit, check to see if there is a subsequent hosts with a different MX
5195 value. If so, make that the next host, and don't count this one. This is a
5196 heuristic to make sure that different MXs do get tried. With a normal kind
5197 of retry rule, they would get tried anyway when the earlier hosts were
5198 delayed, but if the domain has a "retry every time" type of rule - as is
5199 often used for the the very large ISPs, that won't happen. */
5204 /* Make a copy of the host if it is local to this invocation
5205 of the transport. */
5209 thost = store_get(sizeof(host_item), FALSE);
5211 thost->name = string_copy(host->name);
5212 thost->address = string_copy(host->address);
5217 if (!host_is_expired && ++unexpired_hosts_tried >= ob->hosts_max_try)
5220 debug_printf("hosts_max_try limit reached with this host\n");
5221 for (host_item * h = host; h; h = h->next) if (h->mx != host->mx)
5224 unexpired_hosts_tried--;
5225 DEBUG(D_transport) debug_printf("however, a higher MX host exists "
5226 "and will be tried\n");
5231 /* Attempt the delivery. */
5233 total_hosts_tried++;
5234 rc = smtp_deliver(addrlist, thost, host_af, defport, interface, tblock,
5235 &message_defer, FALSE);
5238 OK => connection made, each address contains its result;
5239 message_defer is set for message-specific defers (when all
5240 recipients are marked defer)
5241 DEFER => there was a non-message-specific delivery problem;
5242 ERROR => there was a problem setting up the arguments for a filter,
5243 or there was a problem with expanding added headers
5246 /* If the result is not OK, there was a non-message-specific problem.
5247 If the result is DEFER, we need to write to the logs saying what happened
5248 for this particular host, except in the case of authentication and TLS
5249 failures, where the log has already been written. If all hosts defer a
5250 general message is written at the end. */
5252 if (rc == DEFER && first_addr->basic_errno != ERRNO_AUTHFAIL
5253 && first_addr->basic_errno != ERRNO_TLSFAILURE)
5254 write_logs(host, first_addr->message, first_addr->basic_errno);
5256 #ifndef DISABLE_EVENT
5258 deferred_event_raise(first_addr, host, US"msg:host:defer");
5261 /* If STARTTLS was accepted, but there was a failure in setting up the
5262 TLS session (usually a certificate screwup), and the host is not in
5263 hosts_require_tls, and tls_tempfail_tryclear is true, try again, with
5264 TLS forcibly turned off. We have to start from scratch with a new SMTP
5265 connection. That's why the retry is done from here, not from within
5266 smtp_deliver(). [Rejections of STARTTLS itself don't screw up the
5267 session, so the in-clear transmission after those errors, if permitted,
5268 happens inside smtp_deliver().] */
5272 && first_addr->basic_errno == ERRNO_TLSFAILURE
5273 && ob->tls_tempfail_tryclear
5274 && verify_check_given_host(CUSS &ob->hosts_require_tls, host) != OK
5277 log_write(0, LOG_MAIN,
5278 "%s: delivering unencrypted to H=%s [%s] (not in hosts_require_tls)",
5279 first_addr->message, host->name, host->address);
5280 first_addr = prepare_addresses(addrlist, host);
5281 rc = smtp_deliver(addrlist, thost, host_af, defport, interface, tblock,
5282 &message_defer, TRUE);
5283 if (rc == DEFER && first_addr->basic_errno != ERRNO_AUTHFAIL)
5284 write_logs(host, first_addr->message, first_addr->basic_errno);
5285 # ifndef DISABLE_EVENT
5287 deferred_event_raise(first_addr, host, US"msg:host:defer");
5290 #endif /*DISABLE_TLS*/
5292 #ifndef DISABLE_EVENT
5293 /* If the last host gave a defer raise a per-message event */
5296 && unexpired_hosts_tried < ob->hosts_max_try
5297 && total_hosts_tried < ob->hosts_max_try_hardlimit
5299 && (message_defer || rc == DEFER)
5301 deferred_event_raise(first_addr, host, US"msg:defer");
5305 /* Delivery attempt finished */
5307 set_process_info("delivering %s: just tried %s [%s]%s for %s%s: result %s",
5308 message_id, host->name, host->address, pistring, addrlist->address,
5309 addrlist->next ? " (& others)" : "", rc_to_string(rc));
5311 /* Release serialization if set up */
5313 if (serialize_key) enq_end(serialize_key);
5315 /* If the result is DEFER, or if a host retry record is known to exist, we
5316 need to add an item to the retry chain for updating the retry database
5317 at the end of delivery. We only need to add the item to the top address,
5318 of course. Also, if DEFER, we mark the IP address unusable so as to skip it
5319 for any other delivery attempts using the same address. (It is copied into
5320 the unusable tree at the outer level, so even if different address blocks
5321 contain the same address, it still won't get tried again.) */
5323 if (rc == DEFER || retry_host_key)
5325 int delete_flag = rc != DEFER ? rf_delete : 0;
5326 if (!retry_host_key)
5329 if (exp_bool(addrlist, US"transport", tblock->name, D_transport,
5330 US"retry_include_ip_address", ob->retry_include_ip_address,
5331 ob->expand_retry_include_ip_address, &incl_ip) != OK)
5332 incl_ip = TRUE; /* error; use most-specific retry record */
5334 retry_host_key = incl_ip
5335 ? string_sprintf("T:%S:%s%s", host->name, host->address, pistring)
5336 : string_sprintf("T:%S%s", host->name, pistring);
5339 /* If a delivery of another message over an existing SMTP connection
5340 yields DEFER, we do NOT set up retry data for the host. This covers the
5341 case when there are delays in routing the addresses in the second message
5342 that are so long that the server times out. This is alleviated by not
5343 routing addresses that previously had routing defers when handling an
5344 existing connection, but even so, this case may occur (e.g. if a
5345 previously happily routed address starts giving routing defers). If the
5346 host is genuinely down, another non-continued message delivery will
5347 notice it soon enough. */
5349 if (delete_flag != 0 || !continue_hostname)
5350 retry_add_item(first_addr, retry_host_key, rf_host | delete_flag);
5352 /* We may have tried an expired host, if its retry time has come; ensure
5353 the status reflects the expiry for the benefit of any other addresses. */
5357 host->status = host_is_expired
5358 ? hstatus_unusable_expired : hstatus_unusable;
5359 host->why = hwhy_deferred;
5363 /* If message_defer is set (host was OK, but every recipient got deferred
5364 because of some message-specific problem), or if that had happened
5365 previously so that a message retry key exists, add an appropriate item
5366 to the retry chain. Note that if there was a message defer but now there is
5367 a host defer, the message defer record gets deleted. That seems perfectly
5368 reasonable. Also, stop the message from being remembered as waiting
5369 for specific hosts. */
5371 if (message_defer || retry_message_key)
5373 int delete_flag = message_defer ? 0 : rf_delete;
5374 if (!retry_message_key)
5377 if (exp_bool(addrlist, US"transport", tblock->name, D_transport,
5378 US"retry_include_ip_address", ob->retry_include_ip_address,
5379 ob->expand_retry_include_ip_address, &incl_ip) != OK)
5380 incl_ip = TRUE; /* error; use most-specific retry record */
5382 retry_message_key = incl_ip
5383 ? string_sprintf("T:%S:%s%s:%s", host->name, host->address, pistring,
5385 : string_sprintf("T:%S%s:%s", host->name, pistring, message_id);
5387 retry_add_item(addrlist, retry_message_key,
5388 rf_message | rf_host | delete_flag);
5389 update_waiting = FALSE;
5392 /* Any return other than DEFER (that is, OK or ERROR) means that the
5393 addresses have got their final statuses filled in for this host. In the OK
5394 case, see if any of them are deferred. */
5397 for (address_item * addr = addrlist; addr; addr = addr->next)
5398 if (addr->transport_return == DEFER)
5400 some_deferred = TRUE;
5404 /* If no addresses deferred or the result was ERROR, return. We do this for
5405 ERROR because a failing filter set-up or add_headers expansion is likely to
5406 fail for any host we try. */
5408 if (rc == ERROR || (rc == OK && !some_deferred))
5410 DEBUG(D_transport) debug_printf("Leaving %s transport\n", tblock->name);
5411 return TRUE; /* Each address has its status */
5414 /* If the result was DEFER or some individual addresses deferred, let
5415 the loop run to try other hosts with the deferred addresses, except for the
5416 case when we were trying to deliver down an existing channel and failed.
5417 Don't try any other hosts in this case. */
5419 if (continue_hostname) break;
5421 /* If the whole delivery, or some individual addresses, were deferred and
5422 there are more hosts that could be tried, do not count this host towards
5423 the hosts_max_try limit if the age of the message is greater than the
5424 maximum retry time for this host. This means we may try try all hosts,
5425 ignoring the limit, when messages have been around for some time. This is
5426 important because if we don't try all hosts, the address will never time
5427 out. NOTE: this does not apply to hosts_max_try_hardlimit. */
5429 if ((rc == DEFER || some_deferred) && nexthost)
5432 retry_config *retry = retry_find_config(host->name, NULL, 0, 0);
5434 if (retry && retry->rules)
5436 retry_rule *last_rule;
5437 for (last_rule = retry->rules;
5439 last_rule = last_rule->next);
5440 timedout = time(NULL) - received_time.tv_sec > last_rule->timeout;
5442 else timedout = TRUE; /* No rule => timed out */
5446 unexpired_hosts_tried--;
5447 DEBUG(D_transport) debug_printf("temporary delivery error(s) override "
5448 "hosts_max_try (message older than host's retry time)\n");
5454 if (unexpired_hosts_tried >= ob->hosts_max_try)
5455 debug_printf("reached transport hosts_max_try limit %d\n",
5457 if (total_hosts_tried >= ob->hosts_max_try_hardlimit)
5458 debug_printf("reached transport hosts_max_try_hardlimit limit %d\n",
5459 ob->hosts_max_try_hardlimit);
5462 testharness_pause_ms(500); /* let server debug out */
5463 } /* End of loop for trying multiple hosts. */
5465 /* If we failed to find a matching host in the list, for an already-open
5466 connection, just close it and start over with the list. This can happen
5467 for routing that changes from run to run, or big multi-IP sites with
5470 if (continue_hostname && !continue_host_tried)
5472 int fd = cutthrough.cctx.sock >= 0 ? cutthrough.cctx.sock : 0;
5474 DEBUG(D_transport) debug_printf("no hosts match already-open connection\n");
5476 /* A TLS conn could be open for a cutthrough, but not for a plain continued-
5478 /*XXX doublecheck that! */
5480 if (cutthrough.cctx.sock >= 0 && cutthrough.is_tls)
5482 (void) tls_write(cutthrough.cctx.tls_ctx, US"QUIT\r\n", 6, FALSE);
5483 tls_close(cutthrough.cctx.tls_ctx, TLS_SHUTDOWN_NOWAIT);
5484 cutthrough.cctx.tls_ctx = NULL;
5485 cutthrough.is_tls = FALSE;
5489 (void) write(fd, US"QUIT\r\n", 6);
5492 cutthrough.cctx.sock = -1;
5493 continue_hostname = NULL;
5494 goto retry_non_continued;
5497 /* This is the end of the loop that repeats iff expired is TRUE and
5498 ob->delay_after_cutoff is FALSE. The second time round we will
5499 try those hosts that haven't been tried since the message arrived. */
5503 debug_printf("all IP addresses skipped or deferred at least one address\n");
5504 if (expired && !ob->delay_after_cutoff && cutoff_retry == 0)
5505 debug_printf("retrying IP addresses not tried since message arrived\n");
5510 /* Get here if all IP addresses are skipped or defer at least one address. In
5511 MUA wrapper mode, this will happen only for connection or other non-message-
5512 specific failures. Force the delivery status for all addresses to FAIL. */
5516 for (address_item * addr = addrlist; addr; addr = addr->next)
5517 addr->transport_return = FAIL;
5521 /* In the normal, non-wrapper case, add a standard message to each deferred
5522 address if there hasn't been an error, that is, if it hasn't actually been
5523 tried this time. The variable "expired" will be FALSE if any deliveries were
5524 actually tried, or if there was at least one host that was not expired. That
5525 is, it is TRUE only if no deliveries were tried and all hosts were expired. If
5526 a delivery has been tried, an error code will be set, and the failing of the
5527 message is handled by the retry code later.
5529 If queue_smtp is set, or this transport was called to send a subsequent message
5530 down an existing TCP/IP connection, and something caused the host not to be
5531 found, we end up here, but can detect these cases and handle them specially. */
5533 for (address_item * addr = addrlist; addr; addr = addr->next)
5535 /* If host is not NULL, it means that we stopped processing the host list
5536 because of hosts_max_try or hosts_max_try_hardlimit. In the former case, this
5537 means we need to behave as if some hosts were skipped because their retry
5538 time had not come. Specifically, this prevents the address from timing out.
5539 However, if we have hit hosts_max_try_hardlimit, we want to behave as if all
5540 hosts were tried. */
5543 if (total_hosts_tried >= ob->hosts_max_try_hardlimit)
5546 debug_printf("hosts_max_try_hardlimit reached: behave as if all "
5547 "hosts were tried\n");
5552 debug_printf("hosts_max_try limit caused some hosts to be skipped\n");
5553 setflag(addr, af_retry_skipped);
5556 if (f.queue_smtp) /* no deliveries attempted */
5558 addr->transport_return = DEFER;
5559 addr->basic_errno = 0;
5560 addr->message = US"SMTP delivery explicitly queued";
5563 else if ( addr->transport_return == DEFER
5564 && (addr->basic_errno == ERRNO_UNKNOWNERROR || addr->basic_errno == 0)
5568 addr->basic_errno = ERRNO_HRETRY;
5569 if (continue_hostname)
5570 addr->message = US"no host found for existing SMTP connection";
5573 setflag(addr, af_pass_message); /* This is not a security risk */
5574 addr->message = string_sprintf(
5575 "all hosts%s have been failing for a long time %s",
5576 addr->domain ? string_sprintf(" for '%s'", addr->domain) : US"",
5577 ob->delay_after_cutoff
5578 ? US"(and retry time not reached)"
5579 : US"and were last tried after this message arrived");
5581 /* If we are already using fallback hosts, or there are no fallback hosts
5582 defined, convert the result to FAIL to cause a bounce. */
5584 if (addr->host_list == addr->fallback_hosts || !addr->fallback_hosts)
5585 addr->transport_return = FAIL;
5590 if (hosts_retry == hosts_total)
5591 s = "retry time not reached for any host%s";
5592 else if (hosts_fail == hosts_total)
5593 s = "all host address lookups%s failed permanently";
5594 else if (hosts_defer == hosts_total)
5595 s = "all host address lookups%s failed temporarily";
5596 else if (hosts_serial == hosts_total)
5597 s = "connection limit reached for all hosts%s";
5598 else if (hosts_fail+hosts_defer == hosts_total)
5599 s = "all host address lookups%s failed";
5601 s = "some host address lookups failed and retry time "
5602 "not reached for other hosts or connection limit reached%s";
5604 addr->message = string_sprintf(s,
5605 addr->domain ? string_sprintf(" for '%s'", addr->domain) : US"");
5610 /* Update the database which keeps information about which messages are waiting
5611 for which hosts to become available. For some message-specific errors, the
5612 update_waiting flag is turned off because we don't want follow-on deliveries in
5613 those cases. If this transport instance is explicitly limited to one message
5614 per connection then follow-on deliveries are not possible and there's no need
5615 to create/update the per-transport wait-<transport_name> database. */
5617 if (update_waiting && tblock->connection_max_messages != 1)
5618 transport_update_waiting(hostlist, tblock->name);
5622 DEBUG(D_transport) debug_printf("Leaving %s transport\n", tblock->name);
5624 return TRUE; /* Each address has its status */
5627 #endif /*!MACRO_PREDEF*/
5630 /* End of transport/smtp.c */