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);
1023 #endif /*!DISABLE_PIPE_CONNECT*/
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 = sx->RCPT_452 = 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)
1230 if (!sx->RCPT_452) /* initialised at MAIL-ack above */
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 if (count && !(addr = addr->next))
1279 } /* Loop for next RCPT response */
1281 /* Update where to start at for the next block of responses, unless we
1282 have already handled all the addresses. */
1284 if (addr) sx->sync_addr = addr->next;
1286 /* Handle a response to DATA. If we have not had any good recipients, either
1287 previously or in this block, the response is ignored. */
1289 if (pending_DATA != 0)
1291 DEBUG(D_transport) debug_printf("%s expect data\n", __FUNCTION__);
1292 if (!smtp_read_response(sx, sx->buffer, sizeof(sx->buffer),
1293 '3', ob->command_timeout))
1299 if (errno == ERRNO_TLSFAILURE) /* Error on first TLS read */
1302 if (pending_DATA > 0 || (yield & 1) != 0)
1304 if (errno == 0 && sx->buffer[0] == '4')
1306 errno = ERRNO_DATA4XX;
1307 sx->first_addr->more_errno |= ((sx->buffer[1] - '0')*10 + sx->buffer[2] - '0') << 8;
1311 (void)check_response(sx->conn_args.host, &errno, 0, sx->buffer, &code, &msg, &pass_message);
1312 DEBUG(D_transport) debug_printf("%s\nerror for DATA ignored: pipelining "
1313 "is in use and there were no good recipients\n", msg);
1317 /* All responses read and handled; MAIL (if present) received 2xx and DATA (if
1318 present) received 3xx. If any RCPTs were handled and yielded anything other
1319 than 4xx, yield will be set non-zero. */
1328 /* Try an authenticator's client entry */
1331 try_authenticator(smtp_context * sx, auth_instance * au)
1333 smtp_transport_options_block * ob = sx->conn_args.ob; /* transport options */
1334 host_item * host = sx->conn_args.host; /* host to deliver to */
1337 sx->outblock.authenticating = TRUE;
1338 rc = (au->info->clientcode)(au, sx, ob->command_timeout,
1339 sx->buffer, sizeof(sx->buffer));
1340 sx->outblock.authenticating = FALSE;
1341 DEBUG(D_transport) debug_printf("%s authenticator yielded %d\n", au->name, rc);
1343 /* A temporary authentication failure must hold up delivery to
1344 this host. After a permanent authentication failure, we carry on
1345 to try other authentication methods. If all fail hard, try to
1346 deliver the message unauthenticated unless require_auth was set. */
1351 f.smtp_authenticated = TRUE; /* stops the outer loop */
1352 client_authenticator = au->name;
1353 if (au->set_client_id)
1354 client_authenticated_id = expand_string(au->set_client_id);
1357 /* Failure after writing a command */
1362 /* Failure after reading a response */
1365 if (errno != 0 || sx->buffer[0] != '5') return FAIL;
1366 log_write(0, LOG_MAIN, "%s authenticator failed H=%s [%s] %s",
1367 au->name, host->name, host->address, sx->buffer);
1370 /* Failure by some other means. In effect, the authenticator
1371 decided it wasn't prepared to handle this case. Typically this
1372 is the result of "fail" in an expansion string. Do we need to
1373 log anything here? Feb 2006: a message is now put in the buffer
1374 if logging is required. */
1377 if (*sx->buffer != 0)
1378 log_write(0, LOG_MAIN, "%s authenticator cancelled "
1379 "authentication H=%s [%s] %s", au->name, host->name,
1380 host->address, sx->buffer);
1383 /* Internal problem, message in buffer. */
1386 set_errno_nohost(sx->addrlist, ERRNO_AUTHPROB, string_copy(sx->buffer),
1387 DEFER, FALSE, &sx->delivery_start);
1396 /* Do the client side of smtp-level authentication.
1399 sx smtp connection context
1401 sx->buffer should have the EHLO response from server (gets overwritten)
1404 OK Success, or failed (but not required): global "smtp_authenticated" set
1405 DEFER Failed authentication (and was required)
1406 ERROR Internal problem
1408 FAIL_SEND Failed communications - transmit
1413 smtp_auth(smtp_context * sx)
1415 host_item * host = sx->conn_args.host; /* host to deliver to */
1416 smtp_transport_options_block * ob = sx->conn_args.ob; /* transport options */
1417 int require_auth = verify_check_given_host(CUSS &ob->hosts_require_auth, host);
1418 #ifndef DISABLE_PIPE_CONNECT
1419 unsigned short authbits = tls_out.active.sock >= 0
1420 ? sx->ehlo_resp.crypted_auths : sx->ehlo_resp.cleartext_auths;
1422 uschar * fail_reason = US"server did not advertise AUTH support";
1424 f.smtp_authenticated = FALSE;
1425 client_authenticator = client_authenticated_id = client_authenticated_sender = NULL;
1428 regex_AUTH = regex_must_compile(AUTHS_REGEX, FALSE, TRUE);
1430 /* Is the server offering AUTH? */
1434 #ifndef DISABLE_PIPE_CONNECT
1435 sx->early_pipe_active ? authbits
1438 regex_match_and_setup(regex_AUTH, sx->buffer, 0, -1)
1441 uschar * names = NULL;
1442 expand_nmax = -1; /* reset */
1444 #ifndef DISABLE_PIPE_CONNECT
1445 if (!sx->early_pipe_active)
1447 names = string_copyn(expand_nstring[1], expand_nlength[1]);
1449 /* Must not do this check until after we have saved the result of the
1450 regex match above as the check could be another RE. */
1452 if ( require_auth == OK
1453 || verify_check_given_host(CUSS &ob->hosts_try_auth, host) == OK)
1455 DEBUG(D_transport) debug_printf("scanning authentication mechanisms\n");
1456 fail_reason = US"no common mechanisms were found";
1458 #ifndef DISABLE_PIPE_CONNECT
1459 if (sx->early_pipe_active)
1461 /* Scan our authenticators (which support use by a client and were offered
1462 by the server (checked at cache-write time)), not suppressed by
1463 client_condition. If one is found, attempt to authenticate by calling its
1464 client function. We are limited to supporting up to 16 authenticator
1465 public-names by the number of bits in a short. */
1471 for (bitnum = 0, au = auths;
1472 !f.smtp_authenticated && au && bitnum < 16;
1473 bitnum++, au = au->next) if (authbits & BIT(bitnum))
1475 if ( au->client_condition
1476 && !expand_check_condition(au->client_condition, au->name,
1477 US"client authenticator"))
1479 DEBUG(D_transport) debug_printf("skipping %s authenticator: %s\n",
1480 au->name, "client_condition is false");
1484 /* Found data for a listed mechanism. Call its client entry. Set
1485 a flag in the outblock so that data is overwritten after sending so
1486 that reflections don't show it. */
1488 fail_reason = US"authentication attempt(s) failed";
1490 if ((rc = try_authenticator(sx, au)) != OK)
1497 /* Scan the configured authenticators looking for one which is configured
1498 for use as a client, which is not suppressed by client_condition, and
1499 whose name matches an authentication mechanism supported by the server.
1500 If one is found, attempt to authenticate by calling its client function.
1503 for (auth_instance * au = auths; !f.smtp_authenticated && au; au = au->next)
1508 || ( au->client_condition
1509 && !expand_check_condition(au->client_condition, au->name,
1510 US"client authenticator")))
1512 DEBUG(D_transport) debug_printf("skipping %s authenticator: %s\n",
1514 (au->client)? "client_condition is false" :
1515 "not configured as a client");
1519 /* Loop to scan supported server mechanisms */
1523 int len = Ustrlen(au->public_name);
1526 while (isspace(*p)) p++;
1528 if (strncmpic(au->public_name, p, len) != 0 ||
1529 (p[len] != 0 && !isspace(p[len])))
1531 while (*p != 0 && !isspace(*p)) p++;
1535 /* Found data for a listed mechanism. Call its client entry. Set
1536 a flag in the outblock so that data is overwritten after sending so
1537 that reflections don't show it. */
1539 fail_reason = US"authentication attempt(s) failed";
1541 if ((rc = try_authenticator(sx, au)) != OK)
1544 break; /* If not authenticated, try next authenticator */
1545 } /* Loop for scanning supported server mechanisms */
1546 } /* Loop for further authenticators */
1550 /* If we haven't authenticated, but are required to, give up. */
1552 if (require_auth == OK && !f.smtp_authenticated)
1554 #ifndef DISABLE_PIPE_CONNECT
1555 invalidate_ehlo_cache_entry(sx);
1557 set_errno_nohost(sx->addrlist, ERRNO_AUTHFAIL,
1558 string_sprintf("authentication required but %s", fail_reason), DEFER,
1559 FALSE, &sx->delivery_start);
1567 /* Construct AUTH appendix string for MAIL TO */
1570 sx context for smtp connection
1571 p point in sx->buffer to build string
1572 addrlist chain of potential addresses to deliver
1574 Globals f.smtp_authenticated
1575 client_authenticated_sender
1576 Return True on error, otherwise buffer has (possibly empty) terminated string
1580 smtp_mail_auth_str(smtp_context * sx, uschar * p, address_item * addrlist)
1582 smtp_transport_options_block * ob = sx->conn_args.ob;
1583 uschar * local_authenticated_sender = authenticated_sender;
1586 debug_printf("smtp_mail_auth_str: as<%s> os<%s> SA<%s>\n",
1587 authenticated_sender, ob->authenticated_sender, f.smtp_authenticated?"Y":"N");
1590 if (ob->authenticated_sender)
1592 uschar * new = expand_string(ob->authenticated_sender);
1595 if (!f.expand_string_forcedfail)
1597 uschar *message = string_sprintf("failed to expand "
1598 "authenticated_sender: %s", expand_string_message);
1599 set_errno_nohost(addrlist, ERRNO_EXPANDFAIL, message, DEFER, FALSE, &sx->delivery_start);
1604 local_authenticated_sender = new;
1607 /* Add the authenticated sender address if present */
1609 if ( (f.smtp_authenticated || ob->authenticated_sender_force)
1610 && local_authenticated_sender)
1612 string_format_nt(p, sizeof(sx->buffer) - (p-sx->buffer), " AUTH=%s",
1613 auth_xtextencode(local_authenticated_sender,
1614 Ustrlen(local_authenticated_sender)));
1615 client_authenticated_sender = string_copy(local_authenticated_sender);
1625 typedef struct smtp_compare_s
1627 uschar * current_sender_address;
1628 struct transport_instance * tblock;
1632 /* Create a unique string that identifies this message, it is based on
1633 sender_address, helo_data and tls_certificate if enabled.
1637 smtp_local_identity(uschar * sender, struct transport_instance * tblock)
1639 address_item * addr1;
1640 uschar * if1 = US"";
1641 uschar * helo1 = US"";
1643 uschar * tlsc1 = US"";
1645 uschar * save_sender_address = sender_address;
1646 uschar * local_identity = NULL;
1647 smtp_transport_options_block * ob = SOB tblock->options_block;
1649 sender_address = sender;
1651 addr1 = deliver_make_addr (sender, TRUE);
1652 deliver_set_expansions(addr1);
1655 if1 = expand_string(ob->interface);
1658 helo1 = expand_string(ob->helo_data);
1661 if (ob->tls_certificate)
1662 tlsc1 = expand_string(ob->tls_certificate);
1663 local_identity = string_sprintf ("%s^%s^%s", if1, helo1, tlsc1);
1665 local_identity = string_sprintf ("%s^%s", if1, helo1);
1668 deliver_set_expansions(NULL);
1669 sender_address = save_sender_address;
1671 return local_identity;
1676 /* This routine is a callback that is called from transport_check_waiting.
1677 This function will evaluate the incoming message versus the previous
1678 message. If the incoming message is using a different local identity then
1679 we will veto this new message. */
1682 smtp_are_same_identities(uschar * message_id, smtp_compare_t * s_compare)
1684 uschar * message_local_identity,
1685 * current_local_identity,
1686 * new_sender_address;
1688 current_local_identity =
1689 smtp_local_identity(s_compare->current_sender_address, s_compare->tblock);
1691 if (!(new_sender_address = deliver_get_sender_address(message_id)))
1694 message_local_identity =
1695 smtp_local_identity(new_sender_address, s_compare->tblock);
1697 return Ustrcmp(current_local_identity, message_local_identity) == 0;
1703 ehlo_response(uschar * buf, unsigned checks)
1705 size_t bsize = Ustrlen(buf);
1707 /* debug_printf("%s: check for 0x%04x\n", __FUNCTION__, checks); */
1710 if ( checks & OPTION_TLS
1711 && pcre_exec(regex_STARTTLS, NULL, CS buf, bsize, 0, PCRE_EOPT, NULL, 0) < 0)
1713 checks &= ~OPTION_TLS;
1715 if ( checks & OPTION_IGNQ
1716 && pcre_exec(regex_IGNOREQUOTA, NULL, CS buf, bsize, 0,
1717 PCRE_EOPT, NULL, 0) < 0)
1718 checks &= ~OPTION_IGNQ;
1720 if ( checks & OPTION_CHUNKING
1721 && pcre_exec(regex_CHUNKING, NULL, CS buf, bsize, 0, PCRE_EOPT, NULL, 0) < 0)
1722 checks &= ~OPTION_CHUNKING;
1724 #ifndef DISABLE_PRDR
1725 if ( checks & OPTION_PRDR
1726 && pcre_exec(regex_PRDR, NULL, CS buf, bsize, 0, PCRE_EOPT, NULL, 0) < 0)
1728 checks &= ~OPTION_PRDR;
1731 if ( checks & OPTION_UTF8
1732 && pcre_exec(regex_UTF8, NULL, CS buf, bsize, 0, PCRE_EOPT, NULL, 0) < 0)
1734 checks &= ~OPTION_UTF8;
1736 if ( checks & OPTION_DSN
1737 && pcre_exec(regex_DSN, NULL, CS buf, bsize, 0, PCRE_EOPT, NULL, 0) < 0)
1738 checks &= ~OPTION_DSN;
1740 if ( checks & OPTION_PIPE
1741 && pcre_exec(regex_PIPELINING, NULL, CS buf, bsize, 0,
1742 PCRE_EOPT, NULL, 0) < 0)
1743 checks &= ~OPTION_PIPE;
1745 if ( checks & OPTION_SIZE
1746 && pcre_exec(regex_SIZE, NULL, CS buf, bsize, 0, PCRE_EOPT, NULL, 0) < 0)
1747 checks &= ~OPTION_SIZE;
1749 #ifndef DISABLE_PIPE_CONNECT
1750 if ( checks & OPTION_EARLY_PIPE
1751 && pcre_exec(regex_EARLY_PIPE, NULL, CS buf, bsize, 0,
1752 PCRE_EOPT, NULL, 0) < 0)
1754 checks &= ~OPTION_EARLY_PIPE;
1756 /* debug_printf("%s: found 0x%04x\n", __FUNCTION__, checks); */
1762 /* Callback for emitting a BDAT data chunk header.
1764 If given a nonzero size, first flush any buffered SMTP commands
1765 then emit the command.
1767 Reap previous SMTP command responses if requested, and always reap
1768 the response from a previous BDAT command.
1771 tctx transport context
1772 chunk_size value for SMTP BDAT command
1774 tc_chunk_last add LAST option to SMTP BDAT command
1775 tc_reap_prev reap response to previous SMTP commands
1779 DEFER TLS error on first read (EHLO-resp); errno set
1783 smtp_chunk_cmd_callback(transport_ctx * tctx, unsigned chunk_size,
1786 smtp_transport_options_block * ob = SOB tctx->tblock->options_block;
1787 smtp_context * sx = tctx->smtp_context;
1791 /* Write SMTP chunk header command. If not reaping responses, note that
1792 there may be more writes (like, the chunk data) done soon. */
1796 #ifndef DISABLE_PIPE_CONNECT
1797 BOOL new_conn = !!(sx->outblock.conn_args);
1799 if((cmd_count = smtp_write_command(sx,
1800 flags & tc_reap_prev ? SCMD_FLUSH : SCMD_MORE,
1801 "BDAT %u%s\r\n", chunk_size, flags & tc_chunk_last ? " LAST" : "")
1802 ) < 0) return ERROR;
1803 if (flags & tc_chunk_last)
1804 data_command = string_copy(big_buffer); /* Save for later error message */
1805 #ifndef DISABLE_PIPE_CONNECT
1806 /* That command write could have been the one that made the connection.
1807 Copy the fd from the client conn ctx (smtp transport specific) to the
1808 generic transport ctx. */
1811 tctx->u.fd = sx->outblock.cctx->sock;
1815 prev_cmd_count = cmd_count += sx->cmd_count;
1817 /* Reap responses for any previous, but not one we just emitted */
1821 if (sx->pending_BDAT)
1824 if (flags & tc_reap_prev && prev_cmd_count > 0)
1826 DEBUG(D_transport) debug_printf("look for %d responses"
1827 " for previous pipelined cmds\n", prev_cmd_count);
1829 switch(sync_responses(sx, prev_cmd_count, 0))
1831 case 1: /* 2xx (only) => OK */
1832 case 3: sx->good_RCPT = TRUE; /* 2xx & 5xx => OK & progress made */
1833 case 2: sx->completed_addr = TRUE; /* 5xx (only) => progress made */
1834 case 0: break; /* No 2xx or 5xx, but no probs */
1836 case -5: errno = ERRNO_TLSFAILURE;
1838 #ifndef DISABLE_PIPE_CONNECT
1839 case -4: /* non-2xx for pipelined banner or EHLO */
1841 case -1: /* Timeout on RCPT */
1842 default: return ERROR; /* I/O error, or any MAIL/DATA error */
1845 if (!sx->pending_BDAT)
1846 pipelining_active = FALSE;
1849 /* Reap response for an outstanding BDAT */
1851 if (sx->pending_BDAT)
1853 DEBUG(D_transport) debug_printf("look for one response for BDAT\n");
1855 if (!smtp_read_response(sx, sx->buffer, sizeof(sx->buffer), '2',
1856 ob->command_timeout))
1858 if (errno == 0 && sx->buffer[0] == '4')
1860 errno = ERRNO_DATA4XX; /*XXX does this actually get used? */
1861 sx->addrlist->more_errno |=
1862 ((sx->buffer[1] - '0')*10 + sx->buffer[2] - '0') << 8;
1867 sx->pending_BDAT = FALSE;
1868 pipelining_active = FALSE;
1870 else if (chunk_size > 0)
1871 sx->pending_BDAT = TRUE;
1874 sx->cmd_count = cmd_count;
1882 /*************************************************
1883 * Make connection for given message *
1884 *************************************************/
1888 ctx connection context
1889 suppress_tls if TRUE, don't attempt a TLS connection - this is set for
1890 a second attempt after TLS initialization fails
1892 Returns: OK - the connection was made and the delivery attempted;
1893 fd is set in the conn context, tls_out set up.
1894 DEFER - the connection could not be made, or something failed
1895 while setting up the SMTP session, or there was a
1896 non-message-specific error, such as a timeout.
1897 ERROR - helo_data or add_headers or authenticated_sender is
1898 specified for this transport, and the string failed
1902 smtp_setup_conn(smtp_context * sx, BOOL suppress_tls)
1904 smtp_transport_options_block * ob = sx->conn_args.tblock->options_block;
1905 BOOL pass_message = FALSE;
1906 uschar * message = NULL;
1909 uschar * tls_errstr;
1912 sx->conn_args.ob = ob;
1914 sx->lmtp = strcmpic(ob->protocol, US"lmtp") == 0;
1915 sx->smtps = strcmpic(ob->protocol, US"smtps") == 0;
1916 /* sx->ok = FALSE; */
1917 sx->send_rset = TRUE;
1918 sx->send_quit = TRUE;
1919 sx->setting_up = TRUE;
1921 /* sx->esmtp_sent = FALSE; */
1923 /* sx->utf8_needed = FALSE; */
1925 sx->dsn_all_lasthop = TRUE;
1927 /* sx->conn_args.dane = FALSE; */
1929 verify_check_given_host(CUSS &ob->hosts_require_dane, sx->conn_args.host) == OK;
1931 #ifndef DISABLE_PIPE_CONNECT
1932 /* sx->early_pipe_active = sx->early_pipe_ok = FALSE; */
1933 /* sx->ehlo_resp.cleartext_features = sx->ehlo_resp.crypted_features = 0; */
1934 /* sx->pending_BANNER = sx->pending_EHLO = sx->pending_MAIL = FALSE; */
1937 if ((sx->max_rcpt = sx->conn_args.tblock->max_addresses) == 0) sx->max_rcpt = 999999;
1938 /* sx->peer_offered = 0; */
1939 /* sx->avoid_option = 0; */
1940 sx->igquotstr = US"";
1941 if (!sx->helo_data) sx->helo_data = ob->helo_data;
1942 #ifdef EXPERIMENTAL_DSN_INFO
1943 /* sx->smtp_greeting = NULL; */
1944 /* sx->helo_response = NULL; */
1947 smtp_command = US"initial connection";
1948 /* sx->buffer[0] = '\0'; */
1950 /* Set up the buffer for reading SMTP response packets. */
1952 sx->inblock.buffer = sx->inbuffer;
1953 sx->inblock.buffersize = sizeof(sx->inbuffer);
1954 sx->inblock.ptr = sx->inbuffer;
1955 sx->inblock.ptrend = sx->inbuffer;
1957 /* Set up the buffer for holding SMTP commands while pipelining */
1959 sx->outblock.buffer = sx->outbuffer;
1960 sx->outblock.buffersize = sizeof(sx->outbuffer);
1961 sx->outblock.ptr = sx->outbuffer;
1962 /* sx->outblock.cmd_count = 0; */
1963 /* sx->outblock.authenticating = FALSE; */
1964 /* sx->outblock.conn_args = NULL; */
1966 /* Reset the parameters of a TLS session. */
1969 tls_out.cipher = NULL; /* the one we may use for this transport */
1970 tls_out.ourcert = NULL;
1971 tls_out.peercert = NULL;
1972 tls_out.peerdn = NULL;
1976 tls_out.ocsp = OCSP_NOT_REQ;
1977 #ifdef EXPERIMENTAL_TLS_RESUME
1978 tls_out.resumption = 0;
1982 /* Flip the legacy TLS-related variables over to the outbound set in case
1983 they're used in the context of the transport. Don't bother resetting
1984 afterward (when being used by a transport) as we're in a subprocess.
1985 For verify, unflipped once the callout is dealt with */
1987 tls_modify_variables(&tls_out);
1992 set_errno_nohost(sx->addrlist, ERRNO_TLSFAILURE, US"TLS support not available",
1993 DEFER, FALSE, &sx->delivery_start);
1998 /* If we have a proxied TLS connection, check usability for this message */
2000 if (continue_hostname && continue_proxy_cipher)
2003 const uschar * sni = US"";
2005 # ifdef SUPPORT_DANE
2006 /* Check if the message will be DANE-verified; if so force its SNI */
2008 tls_out.dane_verified = FALSE;
2009 smtp_port_for_connect(sx->conn_args.host, sx->port);
2010 if ( sx->conn_args.host->dnssec == DS_YES
2011 && ( sx->dane_required
2012 || verify_check_given_host(CUSS &ob->hosts_try_dane, sx->conn_args.host) == OK
2014 switch (rc = tlsa_lookup(sx->conn_args.host, &sx->conn_args.tlsa_dnsa, sx->dane_required))
2016 case OK: sx->conn_args.dane = TRUE;
2017 ob->tls_tempfail_tryclear = FALSE; /* force TLS */
2018 ob->tls_sni = sx->first_addr->domain; /* force SNI */
2020 case FAIL_FORCED: break;
2021 default: set_errno_nohost(sx->addrlist, ERRNO_DNSDEFER,
2022 string_sprintf("DANE error: tlsa lookup %s",
2024 rc, FALSE, &sx->delivery_start);
2025 # ifndef DISABLE_EVENT
2026 (void) event_raise(sx->conn_args.tblock->event_action,
2027 US"dane:fail", sx->dane_required
2028 ? US"dane-required" : US"dnssec-invalid");
2034 /* If the SNI or the DANE status required for the new message differs from the
2035 existing conn drop the connection to force a new one. */
2037 if (ob->tls_sni && !(sni = expand_cstring(ob->tls_sni)))
2038 log_write(0, LOG_MAIN|LOG_PANIC,
2039 "<%s>: failed to expand transport's tls_sni value: %s",
2040 sx->addrlist->address, expand_string_message);
2042 # ifdef SUPPORT_DANE
2043 if ( (continue_proxy_sni ? (Ustrcmp(continue_proxy_sni, sni) == 0) : !*sni)
2044 && continue_proxy_dane == sx->conn_args.dane)
2046 tls_out.sni = US sni;
2047 if ((tls_out.dane_verified = continue_proxy_dane))
2048 sx->conn_args.host->dnssec = DS_YES;
2051 if ((continue_proxy_sni ? (Ustrcmp(continue_proxy_sni, sni) == 0) : !*sni))
2052 tls_out.sni = US sni;
2057 debug_printf("Closing proxied-TLS connection due to SNI mismatch\n");
2059 HDEBUG(D_transport|D_acl|D_v) debug_printf_indent(" SMTP>> QUIT\n");
2060 write(0, "QUIT\r\n", 6);
2062 continue_hostname = continue_proxy_cipher = NULL;
2063 f.continue_more = FALSE;
2064 continue_sequence = 1; /* Unfortunately, this process cannot affect success log
2065 which is done by delivery proc. Would have to pass this
2066 back through reporting pipe. */
2069 #endif /*!DISABLE_TLS*/
2071 /* Make a connection to the host if this isn't a continued delivery, and handle
2072 the initial interaction and HELO/EHLO/LHLO. Connect timeout errors are handled
2073 specially so they can be identified for retries. */
2075 if (!continue_hostname)
2078 HDEBUG(D_verify) debug_printf("interface=%s port=%d\n", sx->conn_args.interface, sx->port);
2080 /* Get the actual port the connection will use, into sx->conn_args.host */
2082 smtp_port_for_connect(sx->conn_args.host, sx->port);
2085 /* Do TLSA lookup for DANE */
2087 tls_out.dane_verified = FALSE;
2088 tls_out.tlsa_usage = 0;
2090 if (sx->conn_args.host->dnssec == DS_YES)
2093 if( sx->dane_required
2094 || verify_check_given_host(CUSS &ob->hosts_try_dane, sx->conn_args.host) == OK
2096 switch (rc = tlsa_lookup(sx->conn_args.host, &sx->conn_args.tlsa_dnsa, sx->dane_required))
2098 case OK: sx->conn_args.dane = TRUE;
2099 ob->tls_tempfail_tryclear = FALSE; /* force TLS */
2100 ob->tls_sni = sx->first_addr->domain; /* force SNI */
2102 case FAIL_FORCED: break;
2103 default: set_errno_nohost(sx->addrlist, ERRNO_DNSDEFER,
2104 string_sprintf("DANE error: tlsa lookup %s",
2106 rc, FALSE, &sx->delivery_start);
2107 # ifndef DISABLE_EVENT
2108 (void) event_raise(sx->conn_args.tblock->event_action,
2109 US"dane:fail", sx->dane_required
2110 ? US"dane-required" : US"dnssec-invalid");
2115 else if (sx->dane_required)
2117 set_errno_nohost(sx->addrlist, ERRNO_DNSDEFER,
2118 string_sprintf("DANE error: %s lookup not DNSSEC", sx->conn_args.host->name),
2119 FAIL, FALSE, &sx->delivery_start);
2120 # ifndef DISABLE_EVENT
2121 (void) event_raise(sx->conn_args.tblock->event_action,
2122 US"dane:fail", US"dane-required");
2129 /* Make the TCP connection */
2131 sx->cctx.tls_ctx = NULL;
2132 sx->inblock.cctx = sx->outblock.cctx = &sx->cctx;
2133 sx->avoid_option = sx->peer_offered = smtp_peer_options = 0;
2135 #ifndef DISABLE_PIPE_CONNECT
2136 if ( verify_check_given_host(CUSS &ob->hosts_pipe_connect,
2137 sx->conn_args.host) == OK)
2139 /* We don't find out the local ip address until the connect, so if
2140 the helo string might use it avoid doing early-pipelining. */
2143 || !Ustrstr(sx->helo_data, "$sending_ip_address")
2144 || Ustrstr(sx->helo_data, "def:sending_ip_address")
2147 sx->early_pipe_ok = TRUE;
2148 if ( read_ehlo_cache_entry(sx)
2149 && sx->ehlo_resp.cleartext_features & OPTION_EARLY_PIPE)
2152 debug_printf("Using cached cleartext PIPE_CONNECT\n");
2153 sx->early_pipe_active = TRUE;
2154 sx->peer_offered = sx->ehlo_resp.cleartext_features;
2157 else DEBUG(D_transport)
2158 debug_printf("helo needs $sending_ip_address\n");
2161 if (sx->early_pipe_active)
2162 sx->outblock.conn_args = &sx->conn_args;
2166 if ((sx->cctx.sock = smtp_connect(&sx->conn_args, NULL)) < 0)
2168 set_errno_nohost(sx->addrlist,
2169 errno == ETIMEDOUT ? ERRNO_CONNECTTIMEOUT : errno,
2170 sx->verify ? US strerror(errno) : NULL,
2171 DEFER, FALSE, &sx->delivery_start);
2172 sx->send_quit = FALSE;
2176 /* Expand the greeting message while waiting for the initial response. (Makes
2177 sense if helo_data contains ${lookup dnsdb ...} stuff). The expansion is
2178 delayed till here so that $sending_interface and $sending_port are set. */
2179 /*XXX early-pipe: they still will not be. Is there any way to find out what they
2180 will be? Somehow I doubt it. */
2183 if (!(sx->helo_data = expand_string(sx->helo_data)))
2185 log_write(0, LOG_MAIN|LOG_PANIC,
2186 "<%s>: failed to expand transport's helo_data value for callout: %s",
2187 sx->addrlist->address, expand_string_message);
2192 expand_string_message = NULL;
2193 if ((sx->helo_data = string_domain_utf8_to_alabel(sx->helo_data,
2194 &expand_string_message)),
2195 expand_string_message)
2197 log_write(0, LOG_MAIN|LOG_PANIC,
2198 "<%s>: failed to expand transport's helo_data value for callout: %s",
2199 sx->addrlist->address, expand_string_message);
2201 sx->helo_data = NULL;
2205 /* The first thing is to wait for an initial OK response. The dreaded "goto"
2206 is nevertheless a reasonably clean way of programming this kind of logic,
2207 where you want to escape on any error. */
2211 #ifndef DISABLE_PIPE_CONNECT
2212 if (sx->early_pipe_active)
2214 sx->pending_BANNER = TRUE; /* sync_responses() must eventually handle */
2215 sx->outblock.cmd_count = 1;
2221 (void) setsockopt(sx->cctx.sock, IPPROTO_TCP, TCP_QUICKACK, US &off,
2224 if (!smtp_reap_banner(sx))
2225 goto RESPONSE_FAILED;
2228 #ifndef DISABLE_EVENT
2231 lookup_dnssec_authenticated = sx->conn_args.host->dnssec==DS_YES ? US"yes"
2232 : sx->conn_args.host->dnssec==DS_NO ? US"no" : NULL;
2233 s = event_raise(sx->conn_args.tblock->event_action, US"smtp:connect", sx->buffer);
2236 set_errno_nohost(sx->addrlist, ERRNO_EXPANDFAIL,
2237 string_sprintf("deferred by smtp:connect event expansion: %s", s),
2238 DEFER, FALSE, &sx->delivery_start);
2245 /* Now check if the helo_data expansion went well, and sign off cleanly if
2250 message = string_sprintf("failed to expand helo_data: %s",
2251 expand_string_message);
2252 set_errno_nohost(sx->addrlist, ERRNO_EXPANDFAIL, message, DEFER, FALSE, &sx->delivery_start);
2258 /** Debugging without sending a message
2259 sx->addrlist->transport_return = DEFER;
2263 /* Errors that occur after this point follow an SMTP command, which is
2264 left in big_buffer by smtp_write_command() for use in error messages. */
2266 smtp_command = big_buffer;
2268 /* Tell the remote who we are...
2270 February 1998: A convention has evolved that ESMTP-speaking MTAs include the
2271 string "ESMTP" in their greeting lines, so make Exim send EHLO if the
2272 greeting is of this form. The assumption was that the far end supports it
2273 properly... but experience shows that there are some that give 5xx responses,
2274 even though the banner includes "ESMTP" (there's a bloody-minded one that
2275 says "ESMTP not spoken here"). Cope with that case.
2277 September 2000: Time has passed, and it seems reasonable now to always send
2278 EHLO at the start. It is also convenient to make the change while installing
2281 July 2003: Joachim Wieland met a broken server that advertises "PIPELINING"
2282 but times out after sending MAIL FROM, RCPT TO and DATA all together. There
2283 would be no way to send out the mails, so there is now a host list
2284 "hosts_avoid_esmtp" that disables ESMTP for special hosts and solves the
2285 PIPELINING problem as well. Maybe it can also be useful to cure other
2286 problems with broken servers.
2288 Exim originally sent "Helo" at this point and ran for nearly a year that way.
2289 Then somebody tried it with a Microsoft mailer... It seems that all other
2290 mailers use upper case for some reason (the RFC is quite clear about case
2291 independence) so, for peace of mind, I gave in. */
2293 sx->esmtp = verify_check_given_host(CUSS &ob->hosts_avoid_esmtp, sx->conn_args.host) != OK;
2295 /* Alas; be careful, since this goto is not an error-out, so conceivably
2296 we might set data between here and the target which we assume to exist
2297 and be usable. I can see this coming back to bite us. */
2301 smtp_peer_options |= OPTION_TLS;
2302 suppress_tls = FALSE;
2303 ob->tls_tempfail_tryclear = FALSE;
2304 smtp_command = US"SSL-on-connect";
2311 if (smtp_write_command(sx,
2312 #ifndef DISABLE_PIPE_CONNECT
2313 sx->early_pipe_active ? SCMD_BUFFER :
2316 "%s %s\r\n", sx->lmtp ? "LHLO" : "EHLO", sx->helo_data) < 0)
2318 sx->esmtp_sent = TRUE;
2320 #ifndef DISABLE_PIPE_CONNECT
2321 if (sx->early_pipe_active)
2323 sx->pending_EHLO = TRUE;
2325 /* If we have too many authenticators to handle and might need to AUTH
2326 for this transport, pipeline no further as we will need the
2327 list of auth methods offered. Reap the banner and EHLO. */
2329 if ( (ob->hosts_require_auth || ob->hosts_try_auth)
2330 && f.smtp_in_early_pipe_no_auth)
2332 DEBUG(D_transport) debug_printf("may need to auth, so pipeline no further\n");
2333 if (smtp_write_command(sx, SCMD_FLUSH, NULL) < 0)
2335 if (sync_responses(sx, 2, 0) != 0)
2338 debug_printf("failed reaping pipelined cmd responses\n");
2339 goto RESPONSE_FAILED;
2341 sx->early_pipe_active = FALSE;
2346 if (!smtp_reap_ehlo(sx))
2347 goto RESPONSE_FAILED;
2351 debug_printf("not sending EHLO (host matches hosts_avoid_esmtp)\n");
2353 #ifndef DISABLE_PIPE_CONNECT
2354 if (!sx->early_pipe_active)
2359 int n = sizeof(sx->buffer);
2360 uschar * rsp = sx->buffer;
2362 if (sx->esmtp_sent && (n = Ustrlen(sx->buffer)) < sizeof(sx->buffer)/2)
2363 { rsp = sx->buffer + n + 1; n = sizeof(sx->buffer) - n; }
2365 if (smtp_write_command(sx, SCMD_FLUSH, "HELO %s\r\n", sx->helo_data) < 0)
2367 good_response = smtp_read_response(sx, rsp, n, '2', ob->command_timeout);
2368 #ifdef EXPERIMENTAL_DSN_INFO
2369 sx->helo_response = string_copy(rsp);
2373 /* Handle special logging for a closed connection after HELO
2374 when had previously sent EHLO */
2376 if (rsp != sx->buffer && rsp[0] == 0 && (errno == 0 || errno == ECONNRESET))
2378 errno = ERRNO_SMTPCLOSED;
2379 goto EHLOHELO_FAILED;
2381 memmove(sx->buffer, rsp, Ustrlen(rsp));
2382 goto RESPONSE_FAILED;
2386 if (sx->esmtp || sx->lmtp)
2388 #ifndef DISABLE_PIPE_CONNECT
2389 if (!sx->early_pipe_active)
2392 sx->peer_offered = ehlo_response(sx->buffer,
2393 OPTION_TLS /* others checked later */
2394 #ifndef DISABLE_PIPE_CONNECT
2395 | (sx->early_pipe_ok
2397 | OPTION_CHUNKING | OPTION_PRDR | OPTION_DSN | OPTION_PIPE | OPTION_SIZE
2406 #ifndef DISABLE_PIPE_CONNECT
2407 if (sx->early_pipe_ok)
2409 sx->ehlo_resp.cleartext_features = sx->peer_offered;
2411 if ( (sx->peer_offered & (OPTION_PIPE | OPTION_EARLY_PIPE))
2412 == (OPTION_PIPE | OPTION_EARLY_PIPE))
2414 DEBUG(D_transport) debug_printf("PIPE_CONNECT usable in future for this IP\n");
2415 sx->ehlo_resp.cleartext_auths = study_ehlo_auths(sx);
2416 write_ehlo_cache_entry(sx);
2422 /* Set tls_offered if the response to EHLO specifies support for STARTTLS. */
2425 smtp_peer_options |= sx->peer_offered & OPTION_TLS;
2430 /* For continuing deliveries down the same channel, having re-exec'd the socket
2431 is the standard input; for a socket held open from verify it is recorded
2432 in the cutthrough context block. Either way we don't need to redo EHLO here
2433 (but may need to do so for TLS - see below).
2434 Set up the pointer to where subsequent commands will be left, for
2435 error messages. Note that smtp_peer_options will have been
2436 set from the command line if they were set in the process that passed the
2439 /*XXX continue case needs to propagate DSN_INFO, prob. in deliver.c
2440 as the continue goes via transport_pass_socket() and doublefork and exec.
2441 It does not wait. Unclear how we keep separate host's responses
2442 separate - we could match up by host ip+port as a bodge. */
2446 if (cutthrough.cctx.sock >= 0 && cutthrough.callout_hold_only)
2448 sx->cctx = cutthrough.cctx;
2449 sx->conn_args.host->port = sx->port = cutthrough.host.port;
2453 sx->cctx.sock = 0; /* stdin */
2454 sx->cctx.tls_ctx = NULL;
2455 smtp_port_for_connect(sx->conn_args.host, sx->port); /* Record the port that was used */
2457 sx->inblock.cctx = sx->outblock.cctx = &sx->cctx;
2458 smtp_command = big_buffer;
2459 sx->peer_offered = smtp_peer_options;
2460 sx->helo_data = NULL; /* ensure we re-expand ob->helo_data */
2462 /* For a continued connection with TLS being proxied for us, or a
2463 held-open verify connection with TLS, nothing more to do. */
2465 if ( continue_proxy_cipher
2466 || (cutthrough.cctx.sock >= 0 && cutthrough.callout_hold_only
2467 && cutthrough.is_tls)
2470 sx->pipelining_used = pipelining_active = !!(smtp_peer_options & OPTION_PIPE);
2471 HDEBUG(D_transport) debug_printf("continued connection, %s TLS\n",
2472 continue_proxy_cipher ? "proxied" : "verify conn with");
2475 HDEBUG(D_transport) debug_printf("continued connection, no TLS\n");
2478 /* If TLS is available on this connection, whether continued or not, attempt to
2479 start up a TLS session, unless the host is in hosts_avoid_tls. If successful,
2480 send another EHLO - the server may give a different answer in secure mode. We
2481 use a separate buffer for reading the response to STARTTLS so that if it is
2482 negative, the original EHLO data is available for subsequent analysis, should
2483 the client not be required to use TLS. If the response is bad, copy the buffer
2484 for error analysis. */
2487 if ( smtp_peer_options & OPTION_TLS
2489 && verify_check_given_host(CUSS &ob->hosts_avoid_tls, sx->conn_args.host) != OK
2491 || verify_check_given_host(CUSS &ob->hosts_verify_avoid_tls, sx->conn_args.host) != OK
2494 uschar buffer2[4096];
2496 if (smtp_write_command(sx, SCMD_FLUSH, "STARTTLS\r\n") < 0)
2499 #ifndef DISABLE_PIPE_CONNECT
2500 /* If doing early-pipelining reap the banner and EHLO-response but leave
2501 the response for the STARTTLS we just sent alone. */
2503 if (sx->early_pipe_active && sync_responses(sx, 2, 0) != 0)
2506 debug_printf("failed reaping pipelined cmd responses\n");
2507 close(sx->cctx.sock);
2509 sx->early_pipe_active = FALSE;
2510 goto PIPE_CONNECT_RETRY;
2514 /* If there is an I/O error, transmission of this message is deferred. If
2515 there is a temporary rejection of STARRTLS and tls_tempfail_tryclear is
2516 false, we also defer. However, if there is a temporary rejection of STARTTLS
2517 and tls_tempfail_tryclear is true, or if there is an outright rejection of
2518 STARTTLS, we carry on. This means we will try to send the message in clear,
2519 unless the host is in hosts_require_tls (tested below). */
2521 if (!smtp_read_response(sx, buffer2, sizeof(buffer2), '2', ob->command_timeout))
2525 || (buffer2[0] == '4' && !ob->tls_tempfail_tryclear)
2528 Ustrncpy(sx->buffer, buffer2, sizeof(sx->buffer));
2529 sx->buffer[sizeof(sx->buffer)-1] = '\0';
2530 goto RESPONSE_FAILED;
2534 /* STARTTLS accepted: try to negotiate a TLS session. */
2539 if (!tls_client_start(&sx->cctx, &sx->conn_args, sx->addrlist, &tls_out, &tls_errstr))
2541 /* TLS negotiation failed; give an error. From outside, this function may
2542 be called again to try in clear on a new connection, if the options permit
2543 it for this host. */
2547 DEBUG(D_tls) debug_printf("TLS session fail: %s\n", tls_errstr);
2549 # ifdef SUPPORT_DANE
2550 if (sx->conn_args.dane)
2552 log_write(0, LOG_MAIN,
2553 "DANE attempt failed; TLS connection to %s [%s]: %s",
2554 sx->conn_args.host->name, sx->conn_args.host->address, tls_errstr);
2555 # ifndef DISABLE_EVENT
2556 (void) event_raise(sx->conn_args.tblock->event_action,
2557 US"dane:fail", US"validation-failure"); /* could do with better detail */
2562 errno = ERRNO_TLSFAILURE;
2563 message = string_sprintf("TLS session: %s", tls_errstr);
2564 sx->send_quit = FALSE;
2568 /* TLS session is set up */
2570 smtp_peer_options_wrap = smtp_peer_options;
2571 for (address_item * addr = sx->addrlist; addr; addr = addr->next)
2572 if (addr->transport_return == PENDING_DEFER)
2574 addr->cipher = tls_out.cipher;
2575 addr->ourcert = tls_out.ourcert;
2576 addr->peercert = tls_out.peercert;
2577 addr->peerdn = tls_out.peerdn;
2578 addr->ocsp = tls_out.ocsp;
2579 addr->tlsver = tls_out.ver;
2584 /* if smtps, we'll have smtp_command set to something else; always safe to
2586 smtp_command = big_buffer;
2588 /* If we started TLS, redo the EHLO/LHLO exchange over the secure channel. If
2589 helo_data is null, we are dealing with a connection that was passed from
2590 another process, and so we won't have expanded helo_data above. We have to
2591 expand it here. $sending_ip_address and $sending_port are set up right at the
2592 start of the Exim process (in exim.c). */
2594 if (tls_out.active.sock >= 0)
2596 uschar * greeting_cmd;
2598 if (!sx->helo_data && !(sx->helo_data = expand_string(ob->helo_data)))
2600 uschar *message = string_sprintf("failed to expand helo_data: %s",
2601 expand_string_message);
2602 set_errno_nohost(sx->addrlist, ERRNO_EXPANDFAIL, message, DEFER, FALSE, &sx->delivery_start);
2607 #ifndef DISABLE_PIPE_CONNECT
2608 /* For SMTPS there is no cleartext early-pipe; use the crypted permission bit.
2609 We're unlikely to get the group sent and delivered before the server sends its
2610 banner, but it's still worth sending as a group.
2611 For STARTTLS allow for cleartext early-pipe but no crypted early-pipe, but not
2614 if (sx->smtps ? sx->early_pipe_ok : sx->early_pipe_active)
2616 sx->peer_offered = sx->ehlo_resp.crypted_features;
2617 if ((sx->early_pipe_active =
2618 !!(sx->ehlo_resp.crypted_features & OPTION_EARLY_PIPE)))
2619 DEBUG(D_transport) debug_printf("Using cached crypted PIPE_CONNECT\n");
2623 /* For SMTPS we need to wait for the initial OK response. */
2625 #ifndef DISABLE_PIPE_CONNECT
2626 if (sx->early_pipe_active)
2628 sx->pending_BANNER = TRUE;
2629 sx->outblock.cmd_count = 1;
2633 if (!smtp_reap_banner(sx))
2634 goto RESPONSE_FAILED;
2637 greeting_cmd = US"LHLO";
2639 greeting_cmd = US"EHLO";
2642 greeting_cmd = US"HELO";
2644 debug_printf("not sending EHLO (host matches hosts_avoid_esmtp)\n");
2647 if (smtp_write_command(sx,
2648 #ifndef DISABLE_PIPE_CONNECT
2649 sx->early_pipe_active ? SCMD_BUFFER :
2652 "%s %s\r\n", greeting_cmd, sx->helo_data) < 0)
2655 #ifndef DISABLE_PIPE_CONNECT
2656 if (sx->early_pipe_active)
2657 sx->pending_EHLO = TRUE;
2661 if (!smtp_reap_ehlo(sx))
2664 /* The GnuTLS layer in Exim only spots a server-rejection of a client
2665 cert late, under TLS1.3 - which means here; the first time we try to
2666 receive crypted data. Treat it as if it was a connect-time failure.
2667 See also the early-pipe equivalent... which will be hard; every call
2668 to sync_responses will need to check the result.
2669 It would be nicer to have GnuTLS check the cert during the handshake.
2670 Can it do that, with all the flexibility we need? */
2672 tls_errstr = US"error on first read";
2673 goto GNUTLS_CONN_FAILED;
2676 goto RESPONSE_FAILED;
2678 smtp_peer_options = 0;
2682 /* If the host is required to use a secure channel, ensure that we
2686 # ifdef SUPPORT_DANE
2687 || sx->conn_args.dane
2689 || verify_check_given_host(CUSS &ob->hosts_require_tls, sx->conn_args.host) == OK
2692 errno = ERRNO_TLSREQUIRED;
2693 message = string_sprintf("a TLS session is required, but %s",
2694 smtp_peer_options & OPTION_TLS
2695 ? "an attempt to start TLS failed" : "the server did not offer TLS support");
2696 # if defined(SUPPORT_DANE) && !defined(DISABLE_EVENT)
2697 if (sx->conn_args.dane)
2698 (void) event_raise(sx->conn_args.tblock->event_action, US"dane:fail",
2699 smtp_peer_options & OPTION_TLS
2700 ? US"validation-failure" /* could do with better detail */
2701 : US"starttls-not-supported");
2705 #endif /*DISABLE_TLS*/
2707 /* If TLS is active, we have just started it up and re-done the EHLO command,
2708 so its response needs to be analyzed. If TLS is not active and this is a
2709 continued session down a previously-used socket, we haven't just done EHLO, so
2712 if (continue_hostname == NULL
2714 || tls_out.active.sock >= 0
2718 if (sx->esmtp || sx->lmtp)
2720 #ifndef DISABLE_PIPE_CONNECT
2721 if (!sx->early_pipe_active)
2724 sx->peer_offered = ehlo_response(sx->buffer,
2726 #ifndef DISABLE_PIPE_CONNECT
2727 | (sx->lmtp && ob->lmtp_ignore_quota ? OPTION_IGNQ : 0)
2728 | OPTION_DSN | OPTION_PIPE | OPTION_SIZE
2729 | OPTION_CHUNKING | OPTION_PRDR | OPTION_UTF8
2730 | (tls_out.active.sock >= 0 ? OPTION_EARLY_PIPE : 0) /* not for lmtp */
2734 | (sx->lmtp && ob->lmtp_ignore_quota ? OPTION_IGNQ : 0)
2737 # ifdef SUPPORT_I18N
2738 | (sx->addrlist->prop.utf8_msg ? OPTION_UTF8 : 0)
2739 /*XXX if we hand peercaps on to continued-conn processes,
2740 must not depend on this addr */
2744 | (ob->size_addition >= 0 ? OPTION_SIZE : 0)
2747 #ifndef DISABLE_PIPE_CONNECT
2748 if (tls_out.active.sock >= 0)
2749 sx->ehlo_resp.crypted_features = sx->peer_offered;
2753 /* Set for IGNOREQUOTA if the response to LHLO specifies support and the
2754 lmtp_ignore_quota option was set. */
2756 sx->igquotstr = sx->peer_offered & OPTION_IGNQ ? US" IGNOREQUOTA" : US"";
2758 /* If the response to EHLO specified support for the SIZE parameter, note
2759 this, provided size_addition is non-negative. */
2761 smtp_peer_options |= sx->peer_offered & OPTION_SIZE;
2763 /* Note whether the server supports PIPELINING. If hosts_avoid_esmtp matched
2764 the current host, esmtp will be false, so PIPELINING can never be used. If
2765 the current host matches hosts_avoid_pipelining, don't do it. */
2767 if ( sx->peer_offered & OPTION_PIPE
2768 && verify_check_given_host(CUSS &ob->hosts_avoid_pipelining, sx->conn_args.host) != OK)
2769 smtp_peer_options |= OPTION_PIPE;
2771 DEBUG(D_transport) debug_printf("%susing PIPELINING\n",
2772 smtp_peer_options & OPTION_PIPE ? "" : "not ");
2774 if ( sx->peer_offered & OPTION_CHUNKING
2775 && verify_check_given_host(CUSS &ob->hosts_try_chunking, sx->conn_args.host) != OK)
2776 sx->peer_offered &= ~OPTION_CHUNKING;
2778 if (sx->peer_offered & OPTION_CHUNKING)
2779 DEBUG(D_transport) debug_printf("CHUNKING usable\n");
2781 #ifndef DISABLE_PRDR
2782 if ( sx->peer_offered & OPTION_PRDR
2783 && verify_check_given_host(CUSS &ob->hosts_try_prdr, sx->conn_args.host) != OK)
2784 sx->peer_offered &= ~OPTION_PRDR;
2786 if (sx->peer_offered & OPTION_PRDR)
2787 DEBUG(D_transport) debug_printf("PRDR usable\n");
2790 /* Note if the server supports DSN */
2791 smtp_peer_options |= sx->peer_offered & OPTION_DSN;
2792 DEBUG(D_transport) debug_printf("%susing DSN\n",
2793 sx->peer_offered & OPTION_DSN ? "" : "not ");
2795 #ifndef DISABLE_PIPE_CONNECT
2796 if ( sx->early_pipe_ok
2797 && !sx->early_pipe_active
2798 && tls_out.active.sock >= 0
2799 && smtp_peer_options & OPTION_PIPE
2800 && ( sx->ehlo_resp.cleartext_features | sx->ehlo_resp.crypted_features)
2801 & OPTION_EARLY_PIPE)
2803 DEBUG(D_transport) debug_printf("PIPE_CONNECT usable in future for this IP\n");
2804 sx->ehlo_resp.crypted_auths = study_ehlo_auths(sx);
2805 write_ehlo_cache_entry(sx);
2809 /* Note if the response to EHLO specifies support for the AUTH extension.
2810 If it has, check that this host is one we want to authenticate to, and do
2811 the business. The host name and address must be available when the
2812 authenticator's client driver is running. */
2814 switch (yield = smtp_auth(sx))
2816 default: goto SEND_QUIT;
2818 case FAIL_SEND: goto SEND_FAILED;
2819 case FAIL: goto RESPONSE_FAILED;
2823 sx->pipelining_used = pipelining_active = !!(smtp_peer_options & OPTION_PIPE);
2825 /* The setting up of the SMTP call is now complete. Any subsequent errors are
2826 message-specific. */
2828 sx->setting_up = FALSE;
2831 if (sx->addrlist->prop.utf8_msg)
2835 /* If the transport sets a downconversion mode it overrides any set by ACL
2838 if ((s = ob->utf8_downconvert))
2840 if (!(s = expand_string(s)))
2842 message = string_sprintf("failed to expand utf8_downconvert: %s",
2843 expand_string_message);
2844 set_errno_nohost(sx->addrlist, ERRNO_EXPANDFAIL, message, DEFER, FALSE, &sx->delivery_start);
2850 case '1': sx->addrlist->prop.utf8_downcvt = TRUE;
2851 sx->addrlist->prop.utf8_downcvt_maybe = FALSE;
2853 case '0': sx->addrlist->prop.utf8_downcvt = FALSE;
2854 sx->addrlist->prop.utf8_downcvt_maybe = FALSE;
2856 case '-': if (s[1] == '1')
2858 sx->addrlist->prop.utf8_downcvt = FALSE;
2859 sx->addrlist->prop.utf8_downcvt_maybe = TRUE;
2865 sx->utf8_needed = !sx->addrlist->prop.utf8_downcvt
2866 && !sx->addrlist->prop.utf8_downcvt_maybe;
2867 DEBUG(D_transport) if (!sx->utf8_needed)
2868 debug_printf("utf8: %s downconvert\n",
2869 sx->addrlist->prop.utf8_downcvt ? "mandatory" : "optional");
2872 /* If this is an international message we need the host to speak SMTPUTF8 */
2873 if (sx->utf8_needed && !(sx->peer_offered & OPTION_UTF8))
2875 errno = ERRNO_UTF8_FWD;
2876 goto RESPONSE_FAILED;
2878 #endif /*SUPPORT_I18N*/
2887 if (errno == ECONNREFUSED) /* first-read error on a TFO conn */
2889 /* There is a testing facility for simulating a connection timeout, as I
2890 can't think of any other way of doing this. It converts a connection
2891 refused into a timeout if the timeout is set to 999999. This is done for
2892 a 3whs connection in ip_connect(), but a TFO connection does not error
2893 there - instead it gets ECONNREFUSED on the first data read. Tracking
2894 that a TFO really was done is too hard, or we would set a
2895 sx->pending_conn_done bit and test that in smtp_reap_banner() and
2896 smtp_reap_ehlo(). That would let us also add the conn-timeout to the
2899 if (f.running_in_test_harness && ob->connect_timeout == 999999)
2901 set_errno_nohost(sx->addrlist,
2902 errno == ETIMEDOUT ? ERRNO_CONNECTTIMEOUT : errno,
2903 sx->verify ? US strerror(errno) : NULL,
2904 DEFER, FALSE, &sx->delivery_start);
2905 sx->send_quit = FALSE;
2909 /* really an error on an SMTP read */
2911 sx->send_quit = check_response(sx->conn_args.host, &errno, sx->addrlist->more_errno,
2912 sx->buffer, &code, &message, &pass_message);
2918 message = US string_sprintf("send() to %s [%s] failed: %s",
2919 sx->conn_args.host->name, sx->conn_args.host->address, strerror(errno));
2920 sx->send_quit = FALSE;
2926 message = string_sprintf("Remote host closed connection in response to %s"
2927 " (EHLO response was: %s)", smtp_command, sx->buffer);
2928 sx->send_quit = FALSE;
2932 /* This label is jumped to directly when a TLS negotiation has failed,
2933 or was not done for a host for which it is required. Values will be set
2934 in message and errno, and setting_up will always be true. Treat as
2935 a temporary error. */
2939 code = '4', yield = DEFER;
2943 /* The failure happened while setting up the call; see if the failure was
2944 a 5xx response (this will either be on connection, or following HELO - a 5xx
2945 after EHLO causes it to try HELO). If so, and there are no more hosts to try,
2946 fail all addresses, as this host is never going to accept them. For other
2947 errors during setting up (timeouts or whatever), defer all addresses, and
2948 yield DEFER, so that the host is not tried again for a while.
2950 XXX This peeking for another host feels like a layering violation. We want
2951 to note the host as unusable, but down here we shouldn't know if this was
2952 the last host to try for the addr(list). Perhaps the upper layer should be
2953 the one to do set_errno() ? The problem is that currently the addr is where
2954 errno etc. are stashed, but until we run out of hosts to try the errors are
2955 host-specific. Maybe we should enhance the host_item definition? */
2958 sx->ok = FALSE; /* For when reached by GOTO */
2959 set_errno(sx->addrlist, errno, message,
2960 sx->conn_args.host->next
2964 || errno == ERRNO_UTF8_FWD
2968 errno == ECONNREFUSED ? NULL : sx->conn_args.host,
2969 #ifdef EXPERIMENTAL_DSN_INFO
2970 sx->smtp_greeting, sx->helo_response,
2972 &sx->delivery_start);
2979 (void)smtp_write_command(sx, SCMD_FLUSH, "QUIT\r\n");
2982 if (sx->cctx.tls_ctx)
2984 tls_close(sx->cctx.tls_ctx, TLS_SHUTDOWN_NOWAIT);
2985 sx->cctx.tls_ctx = NULL;
2989 /* Close the socket, and return the appropriate value, first setting
2990 works because the NULL setting is passed back to the calling process, and
2991 remote_max_parallel is forced to 1 when delivering over an existing connection,
2994 HDEBUG(D_transport|D_acl|D_v) debug_printf_indent(" SMTP(close)>>\n");
2997 shutdown(sx->cctx.sock, SHUT_WR);
2998 if (fcntl(sx->cctx.sock, F_SETFL, O_NONBLOCK) == 0)
2999 for (int i = 16; read(sx->cctx.sock, sx->inbuffer, sizeof(sx->inbuffer)) > 0 && i > 0;)
3000 i--; /* drain socket */
3001 sx->send_quit = FALSE;
3003 (void)close(sx->cctx.sock);
3006 #ifndef DISABLE_EVENT
3007 (void) event_raise(sx->conn_args.tblock->event_action, US"tcp:close", NULL);
3010 continue_transport = NULL;
3011 continue_hostname = NULL;
3018 /* Create the string of options that will be appended to the MAIL FROM:
3019 in the connection context buffer */
3022 build_mailcmd_options(smtp_context * sx, address_item * addrlist)
3024 uschar * p = sx->buffer;
3025 address_item * addr;
3030 /* If we know the receiving MTA supports the SIZE qualification, and we know it,
3031 send it, adding something to the message size to allow for imprecision
3032 and things that get added en route. Exim keeps the number of lines
3033 in a message, so we can give an accurate value for the original message, but we
3034 need some additional to handle added headers. (Double "." characters don't get
3035 included in the count.) */
3037 if ( message_size > 0
3038 && sx->peer_offered & OPTION_SIZE && !(sx->avoid_option & OPTION_SIZE))
3040 /*XXX problem here under spool_files_wireformat?
3041 Or just forget about lines? Or inflate by a fixed proportion? */
3043 sprintf(CS p, " SIZE=%d", message_size+message_linecount+(SOB sx->conn_args.ob)->size_addition);
3047 #ifndef DISABLE_PRDR
3048 /* If it supports Per-Recipient Data Responses, and we have more than one recipient,
3051 sx->prdr_active = FALSE;
3052 if (sx->peer_offered & OPTION_PRDR)
3053 for (address_item * addr = addrlist; addr; addr = addr->next)
3054 if (addr->transport_return == PENDING_DEFER)
3056 for (addr = addr->next; addr; addr = addr->next)
3057 if (addr->transport_return == PENDING_DEFER)
3058 { /* at least two recipients to send */
3059 sx->prdr_active = TRUE;
3060 sprintf(CS p, " PRDR"); p += 5;
3068 /* If it supports internationalised messages, and this meesage need that,
3071 if ( sx->peer_offered & OPTION_UTF8
3072 && addrlist->prop.utf8_msg
3073 && !addrlist->prop.utf8_downcvt
3075 Ustrcpy(p, US" SMTPUTF8"), p += 9;
3078 /* check if all addresses have DSN-lasthop flag; do not send RET and ENVID if so */
3079 for (sx->dsn_all_lasthop = TRUE, addr = addrlist, address_count = 0;
3080 addr && address_count < sx->max_rcpt;
3081 addr = addr->next) if (addr->transport_return == PENDING_DEFER)
3084 if (!(addr->dsn_flags & rf_dsnlasthop))
3086 sx->dsn_all_lasthop = FALSE;
3091 /* Add any DSN flags to the mail command */
3093 if (sx->peer_offered & OPTION_DSN && !sx->dsn_all_lasthop)
3095 if (dsn_ret == dsn_ret_hdrs)
3096 { Ustrcpy(p, US" RET=HDRS"); p += 9; }
3097 else if (dsn_ret == dsn_ret_full)
3098 { Ustrcpy(p, US" RET=FULL"); p += 9; }
3102 string_format(p, sizeof(sx->buffer) - (p-sx->buffer), " ENVID=%s", dsn_envid);
3107 /* If an authenticated_sender override has been specified for this transport
3108 instance, expand it. If the expansion is forced to fail, and there was already
3109 an authenticated_sender for this message, the original value will be used.
3110 Other expansion failures are serious. An empty result is ignored, but there is
3111 otherwise no check - this feature is expected to be used with LMTP and other
3112 cases where non-standard addresses (e.g. without domains) might be required. */
3114 return smtp_mail_auth_str(sx, p, addrlist) ? ERROR : OK;
3119 build_rcptcmd_options(smtp_context * sx, const address_item * addr)
3121 uschar * p = sx->buffer;
3124 /* Add any DSN flags to the rcpt command */
3126 if (sx->peer_offered & OPTION_DSN && !(addr->dsn_flags & rf_dsnlasthop))
3128 if (addr->dsn_flags & rf_dsnflags)
3132 Ustrcpy(p, US" NOTIFY=");
3134 for (int i = 0; i < nelem(rf_list); i++) if (addr->dsn_flags & rf_list[i])
3136 if (!first) *p++ = ',';
3138 Ustrcpy(p, rf_names[i]);
3143 if (addr->dsn_orcpt)
3145 string_format(p, sizeof(sx->buffer) - (p-sx->buffer), " ORCPT=%s",
3156 0 good, rcpt results in addr->transport_return (PENDING_OK, DEFER, FAIL)
3157 -1 MAIL response error
3158 -2 any non-MAIL read i/o error
3159 -3 non-MAIL response timeout
3160 -4 internal error; channel still usable
3165 smtp_write_mail_and_rcpt_cmds(smtp_context * sx, int * yield)
3167 address_item * addr;
3168 int address_count, pipe_limit;
3171 if (build_mailcmd_options(sx, sx->first_addr) != OK)
3177 /* From here until we send the DATA command, we can make use of PIPELINING
3178 if the server host supports it. The code has to be able to check the responses
3179 at any point, for when the buffer fills up, so we write it totally generally.
3180 When PIPELINING is off, each command written reports that it has flushed the
3183 sx->pending_MAIL = TRUE; /* The block starts with MAIL */
3186 uschar * s = sx->from_addr;
3188 uschar * errstr = NULL;
3190 /* If we must downconvert, do the from-address here. Remember we had to
3191 for the to-addresses (done below), and also (ugly) for re-doing when building
3192 the delivery log line. */
3194 if ( sx->addrlist->prop.utf8_msg
3195 && (sx->addrlist->prop.utf8_downcvt || !(sx->peer_offered & OPTION_UTF8))
3198 if (s = string_address_utf8_to_alabel(s, &errstr), errstr)
3200 set_errno_nohost(sx->addrlist, ERRNO_EXPANDFAIL, errstr, DEFER, FALSE, &sx->delivery_start);
3204 setflag(sx->addrlist, af_utf8_downcvt);
3208 rc = smtp_write_command(sx, pipelining_active ? SCMD_BUFFER : SCMD_FLUSH,
3209 "MAIL FROM:<%s>%s\r\n", s, sx->buffer);
3212 mail_command = string_copy(big_buffer); /* Save for later error message */
3216 case -1: /* Transmission error */
3219 case +1: /* Cmd was sent */
3220 if (!smtp_read_response(sx, sx->buffer, sizeof(sx->buffer), '2',
3221 (SOB sx->conn_args.ob)->command_timeout))
3223 if (errno == 0 && sx->buffer[0] == '4')
3225 errno = ERRNO_MAIL4XX;
3226 sx->addrlist->more_errno |= ((sx->buffer[1] - '0')*10 + sx->buffer[2] - '0') << 8;
3230 sx->pending_MAIL = FALSE;
3233 /* otherwise zero: command queued for pipeline */
3236 /* Pass over all the relevant recipient addresses for this host, which are the
3237 ones that have status PENDING_DEFER. If we are using PIPELINING, we can send
3238 several before we have to read the responses for those seen so far. This
3239 checking is done by a subroutine because it also needs to be done at the end.
3240 Send only up to max_rcpt addresses at a time, leaving next_addr pointing to
3241 the next one if not all are sent.
3243 In the MUA wrapper situation, we want to flush the PIPELINING buffer for the
3244 last address because we want to abort if any recipients have any kind of
3245 problem, temporary or permanent. We know that all recipient addresses will have
3246 the PENDING_DEFER status, because only one attempt is ever made, and we know
3247 that max_rcpt will be large, so all addresses will be done at once.
3249 For verify we flush the pipeline after any (the only) rcpt address. */
3251 for (addr = sx->first_addr, address_count = 0, pipe_limit = 100;
3252 addr && address_count < sx->max_rcpt;
3253 addr = addr->next) if (addr->transport_return == PENDING_DEFER)
3259 addr->dsn_aware = sx->peer_offered & OPTION_DSN
3260 ? dsn_support_yes : dsn_support_no;
3263 if (pipe_limit-- <= 0)
3264 { no_flush = FALSE; pipe_limit = 100; }
3266 no_flush = pipelining_active && !sx->verify
3267 && (!mua_wrapper || addr->next && address_count < sx->max_rcpt);
3269 build_rcptcmd_options(sx, addr);
3271 /* Now send the RCPT command, and process outstanding responses when
3272 necessary. After a timeout on RCPT, we just end the function, leaving the
3273 yield as OK, because this error can often mean that there is a problem with
3274 just one address, so we don't want to delay the host. */
3276 rcpt_addr = transport_rcpt_address(addr, sx->conn_args.tblock->rcpt_include_affixes);
3279 if ( testflag(sx->addrlist, af_utf8_downcvt)
3280 && !(rcpt_addr = string_address_utf8_to_alabel(rcpt_addr, NULL))
3283 /*XXX could we use a per-address errstr here? Not fail the whole send? */
3284 errno = ERRNO_EXPANDFAIL;
3285 return -5; /*XXX too harsh? */
3289 cmds_sent = smtp_write_command(sx, no_flush ? SCMD_BUFFER : SCMD_FLUSH,
3290 "RCPT TO:<%s>%s%s\r\n", rcpt_addr, sx->igquotstr, sx->buffer);
3292 if (cmds_sent < 0) return -5;
3295 switch(sync_responses(sx, cmds_sent, 0))
3297 case 3: sx->ok = TRUE; /* 2xx & 5xx => OK & progress made */
3298 case 2: sx->completed_addr = TRUE; /* 5xx (only) => progress made */
3301 case 1: sx->ok = TRUE; /* 2xx (only) => OK, but if LMTP, */
3302 if (!sx->lmtp) /* can't tell about progress yet */
3303 sx->completed_addr = TRUE;
3304 case 0: /* No 2xx or 5xx, but no probs */
3305 /* If any RCPT got a 452 response then next_addr has been updated
3306 for restarting with a new MAIL on the same connection. Send no more
3307 RCPTs for this MAIL. */
3311 DEBUG(D_transport) debug_printf("seen 452 too-many-rcpts\n");
3312 sx->RCPT_452 = FALSE;
3313 /* sx->next_addr has been reset for fast_retry */
3318 case -1: return -3; /* Timeout on RCPT */
3319 case -2: return -2; /* non-MAIL read i/o error */
3320 default: return -1; /* any MAIL error */
3322 #ifndef DISABLE_PIPE_CONNECT
3323 case -4: return -1; /* non-2xx for pipelined banner or EHLO */
3324 case -5: return -1; /* TLS first-read error */
3328 } /* Loop for next address */
3330 sx->next_addr = addr;
3336 /*****************************************************
3337 * Proxy TLS connection for another transport process *
3338 ******************************************************/
3340 Close the unused end of the pipe, fork once more, then use the given buffer
3341 as a staging area, and select on both the given fd and the TLS'd client-fd for
3342 data to read (per the coding in ip_recv() and fd_ready() this is legitimate).
3343 Do blocking full-size writes, and reads under a timeout. Once both input
3344 channels are closed, exit the process.
3348 buf space to use for buffering
3349 bufsiz size of buffer
3350 pfd pipe filedescriptor array; [0] is comms to proxied process
3351 timeout per-read timeout, seconds
3357 smtp_proxy_tls(void * ct_ctx, uschar * buf, size_t bsize, int * pfd,
3361 int max_fd = MAX(pfd[0], tls_out.active.sock) + 1;
3365 if ((rc = exim_fork(US"tls-proxy")))
3366 _exit(rc < 0 ? EXIT_FAILURE : EXIT_SUCCESS);
3368 set_process_info("proxying TLS connection for continued transport");
3370 FD_SET(tls_out.active.sock, &rfds);
3371 FD_SET(pfd[0], &rfds);
3373 for (int fd_bits = 3; fd_bits; )
3375 time_t time_left = timeout;
3376 time_t time_start = time(NULL);
3382 struct timeval tv = { time_left, 0 };
3385 (SELECT_ARG2_TYPE *)&rfds, NULL, (SELECT_ARG2_TYPE *)&efds, &tv);
3387 if (rc < 0 && errno == EINTR)
3388 if ((time_left -= time(NULL) - time_start) > 0) continue;
3392 DEBUG(D_transport) if (rc == 0) debug_printf("%s: timed out\n", __FUNCTION__);
3396 if (FD_ISSET(tls_out.active.sock, &efds) || FD_ISSET(pfd[0], &efds))
3398 DEBUG(D_transport) debug_printf("select: exceptional cond on %s fd\n",
3399 FD_ISSET(pfd[0], &efds) ? "proxy" : "tls");
3403 while (rc < 0 || !(FD_ISSET(tls_out.active.sock, &rfds) || FD_ISSET(pfd[0], &rfds)));
3405 /* handle inbound data */
3406 if (FD_ISSET(tls_out.active.sock, &rfds))
3407 if ((rc = tls_read(ct_ctx, buf, bsize)) <= 0)
3410 FD_CLR(tls_out.active.sock, &rfds);
3411 shutdown(pfd[0], SHUT_WR);
3416 for (int nbytes = 0; rc - nbytes > 0; nbytes += i)
3417 if ((i = write(pfd[0], buf + nbytes, rc - nbytes)) < 0) goto done;
3419 else if (fd_bits & 1)
3420 FD_SET(tls_out.active.sock, &rfds);
3422 /* handle outbound data */
3423 if (FD_ISSET(pfd[0], &rfds))
3424 if ((rc = read(pfd[0], buf, bsize)) <= 0)
3427 tls_close(ct_ctx, TLS_SHUTDOWN_NOWAIT);
3432 for (int nbytes = 0; rc - nbytes > 0; nbytes += i)
3433 if ((i = tls_write(ct_ctx, buf + nbytes, rc - nbytes, FALSE)) < 0)
3436 else if (fd_bits & 2)
3437 FD_SET(pfd[0], &rfds);
3441 testharness_pause_ms(100); /* let logging complete */
3442 exim_exit(EXIT_SUCCESS);
3447 /*************************************************
3448 * Deliver address list to given host *
3449 *************************************************/
3451 /* If continue_hostname is not null, we get here only when continuing to
3452 deliver down an existing channel. The channel was passed as the standard
3453 input. TLS is never active on a passed channel; the previous process either
3454 closes it down before passing the connection on, or inserts a TLS-proxy
3455 process and passes on a cleartext conection.
3457 Otherwise, we have to make a connection to the remote host, and do the
3458 initial protocol exchange.
3460 When running as an MUA wrapper, if the sender or any recipient is rejected,
3461 temporarily or permanently, we force failure for all recipients.
3464 addrlist chain of potential addresses to deliver; only those whose
3465 transport_return field is set to PENDING_DEFER are currently
3466 being processed; others should be skipped - they have either
3467 been delivered to an earlier host or IP address, or been
3468 failed by one of them.
3469 host host to deliver to
3470 host_af AF_INET or AF_INET6
3471 defport default TCP/IP port to use if host does not specify, in host
3473 interface interface to bind to, or NULL
3474 tblock transport instance block
3475 message_defer set TRUE if yield is OK, but all addresses were deferred
3476 because of a non-recipient, non-host failure, that is, a
3477 4xx response to MAIL FROM, DATA, or ".". This is a defer
3478 that is specific to the message.
3479 suppress_tls if TRUE, don't attempt a TLS connection - this is set for
3480 a second attempt after TLS initialization fails
3482 Returns: OK - the connection was made and the delivery attempted;
3483 the result for each address is in its data block.
3484 DEFER - the connection could not be made, or something failed
3485 while setting up the SMTP session, or there was a
3486 non-message-specific error, such as a timeout.
3487 ERROR - a filter command is specified for this transport,
3488 and there was a problem setting it up; OR helo_data
3489 or add_headers or authenticated_sender is specified
3490 for this transport, and the string failed to expand
3492 For all non-OK returns the first addr of the list carries the
3493 time taken for the attempt.
3497 smtp_deliver(address_item *addrlist, host_item *host, int host_af, int defport,
3498 uschar *interface, transport_instance *tblock,
3499 BOOL *message_defer, BOOL suppress_tls)
3501 smtp_transport_options_block * ob = SOB tblock->options_block;
3506 BOOL pass_message = FALSE;
3507 uschar *message = NULL;
3508 uschar new_message_id[MESSAGE_ID_LENGTH + 1];
3509 smtp_context * sx = store_get(sizeof(*sx), TRUE); /* tainted, for the data buffers */
3514 suppress_tls = suppress_tls; /* stop compiler warning when no TLS support */
3515 *message_defer = FALSE;
3517 memset(sx, 0, sizeof(*sx));
3518 sx->addrlist = addrlist;
3519 sx->conn_args.host = host;
3520 sx->conn_args.host_af = host_af,
3522 sx->conn_args.interface = interface;
3523 sx->helo_data = NULL;
3524 sx->conn_args.tblock = tblock;
3525 /* sx->verify = FALSE; */
3526 gettimeofday(&sx->delivery_start, NULL);
3527 sx->sync_addr = sx->first_addr = addrlist;
3534 /* Get the channel set up ready for a message, MAIL FROM being the next
3535 SMTP command to send. */
3537 if ((rc = smtp_setup_conn(sx, suppress_tls)) != OK)
3539 timesince(&addrlist->delivery_time, &sx->delivery_start);
3545 /* If the connection used DANE, ignore for now any addresses with incompatible
3546 domains. The SNI has to be the domain. Arrange a whole new TCP conn later,
3547 just in case only TLS isn't enough. */
3549 if (sx->conn_args.dane)
3551 const uschar * dane_domain = sx->first_addr->domain;
3553 for (address_item * a = sx->first_addr->next; a; a = a->next)
3554 if ( a->transport_return == PENDING_DEFER
3555 && Ustrcmp(dane_domain, a->domain) != 0)
3557 DEBUG(D_transport) debug_printf("DANE: holding %s for later\n", a->domain);
3559 a->transport_return = DANE;
3564 /* If there is a filter command specified for this transport, we can now
3565 set it up. This cannot be done until the identity of the host is known. */
3567 if (tblock->filter_command)
3569 transport_filter_timeout = tblock->filter_timeout;
3571 /* On failure, copy the error to all addresses, abandon the SMTP call, and
3574 if (!transport_set_up_command(&transport_filter_argv,
3575 tblock->filter_command, TRUE, DEFER, addrlist,
3576 string_sprintf("%.50s transport", tblock->name), NULL))
3578 set_errno_nohost(addrlist->next, addrlist->basic_errno, addrlist->message, DEFER,
3579 FALSE, &sx->delivery_start);
3584 if ( transport_filter_argv
3585 && *transport_filter_argv
3586 && **transport_filter_argv
3587 && sx->peer_offered & OPTION_CHUNKING
3588 #ifndef DISABLE_DKIM
3589 /* When dkim signing, chunking is handled even with a transport-filter */
3590 && !(ob->dkim.dkim_private_key && ob->dkim.dkim_domain && ob->dkim.dkim_selector)
3591 && !ob->dkim.force_bodyhash
3595 sx->peer_offered &= ~OPTION_CHUNKING;
3596 DEBUG(D_transport) debug_printf("CHUNKING not usable due to transport filter\n");
3600 /* For messages that have more than the maximum number of envelope recipients,
3601 we want to send several transactions down the same SMTP connection. (See
3602 comments in deliver.c as to how this reconciles, heuristically, with
3603 remote_max_parallel.) This optimization was added to Exim after the following
3604 code was already working. The simplest way to put it in without disturbing the
3605 code was to use a goto to jump back to this point when there is another
3606 transaction to handle. */
3609 sx->from_addr = return_path;
3610 sx->sync_addr = sx->first_addr;
3612 sx->send_rset = TRUE;
3613 sx->completed_addr = FALSE;
3616 /* If we are a continued-connection-after-verify the MAIL and RCPT
3617 commands were already sent; do not re-send but do mark the addrs as
3618 having been accepted up to RCPT stage. A traditional cont-conn
3619 always has a sequence number greater than one. */
3621 if (continue_hostname && continue_sequence == 1)
3623 /* sx->pending_MAIL = FALSE; */
3625 /* sx->next_addr = NULL; */
3627 for (address_item * addr = addrlist; addr; addr = addr->next)
3628 addr->transport_return = PENDING_OK;
3632 /* Initiate a message transfer. */
3634 switch(smtp_write_mail_and_rcpt_cmds(sx, &yield))
3637 case -1: case -2: goto RESPONSE_FAILED;
3638 case -3: goto END_OFF;
3639 case -4: goto SEND_QUIT;
3640 default: goto SEND_FAILED;
3643 /* If we are an MUA wrapper, abort if any RCPTs were rejected, either
3644 permanently or temporarily. We should have flushed and synced after the last
3652 for (a = sx->first_addr, cnt = 0; a && cnt < sx->max_rcpt; a = a->next, cnt++)
3653 if (a->transport_return != PENDING_OK)
3655 /*XXX could we find a better errno than 0 here? */
3656 set_errno_nohost(addrlist, 0, a->message, FAIL,
3657 testflag(a, af_pass_message), &sx->delivery_start);
3664 /* If ok is TRUE, we know we have got at least one good recipient, and must now
3665 send DATA, but if it is FALSE (in the normal, non-wrapper case), we may still
3666 have a good recipient buffered up if we are pipelining. We don't want to waste
3667 time sending DATA needlessly, so we only send it if either ok is TRUE or if we
3668 are pipelining. The responses are all handled by sync_responses().
3669 If using CHUNKING, do not send a BDAT until we know how big a chunk we want
3672 if ( !(sx->peer_offered & OPTION_CHUNKING)
3673 && (sx->ok || (pipelining_active && !mua_wrapper)))
3675 int count = smtp_write_command(sx, SCMD_FLUSH, "DATA\r\n");
3677 if (count < 0) goto SEND_FAILED;
3678 switch(sync_responses(sx, count, sx->ok ? +1 : -1))
3680 case 3: sx->ok = TRUE; /* 2xx & 5xx => OK & progress made */
3681 case 2: sx->completed_addr = TRUE; /* 5xx (only) => progress made */
3684 case 1: sx->ok = TRUE; /* 2xx (only) => OK, but if LMTP, */
3685 if (!sx->lmtp) sx->completed_addr = TRUE; /* can't tell about progress yet */
3686 case 0: break; /* No 2xx or 5xx, but no probs */
3688 case -1: goto END_OFF; /* Timeout on RCPT */
3690 #ifndef DISABLE_PIPE_CONNECT
3691 case -5: /* TLS first-read error */
3692 case -4: HDEBUG(D_transport)
3693 debug_printf("failed reaping pipelined cmd responses\n");
3695 default: goto RESPONSE_FAILED; /* I/O error, or any MAIL/DATA error */
3697 pipelining_active = FALSE;
3698 data_command = string_copy(big_buffer); /* Save for later error message */
3701 /* If there were no good recipients (but otherwise there have been no
3702 problems), just set ok TRUE, since we have handled address-specific errors
3703 already. Otherwise, it's OK to send the message. Use the check/escape mechanism
3704 for handling the SMTP dot-handling protocol, flagging to apply to headers as
3705 well as body. Set the appropriate timeout value to be used for each chunk.
3706 (Haven't been able to make it work using select() for writing yet.) */
3709 && (!(sx->peer_offered & OPTION_CHUNKING) || !pipelining_active))
3711 /* Save the first address of the next batch. */
3712 sx->first_addr = sx->next_addr;
3718 transport_ctx tctx = {
3719 .u = {.fd = sx->cctx.sock}, /*XXX will this need TLS info? */
3722 .check_string = US".",
3723 .escape_string = US"..", /* Escaping strings */
3725 topt_use_crlf | topt_escape_headers
3726 | (tblock->body_only ? topt_no_headers : 0)
3727 | (tblock->headers_only ? topt_no_body : 0)
3728 | (tblock->return_path_add ? topt_add_return_path : 0)
3729 | (tblock->delivery_date_add ? topt_add_delivery_date : 0)
3730 | (tblock->envelope_to_add ? topt_add_envelope_to : 0)
3733 /* If using CHUNKING we need a callback from the generic transport
3734 support to us, for the sending of BDAT smtp commands and the reaping
3735 of responses. The callback needs a whole bunch of state so set up
3736 a transport-context structure to be passed around. */
3738 if (sx->peer_offered & OPTION_CHUNKING)
3740 tctx.check_string = tctx.escape_string = NULL;
3741 tctx.options |= topt_use_bdat;
3742 tctx.chunk_cb = smtp_chunk_cmd_callback;
3743 sx->pending_BDAT = FALSE;
3744 sx->good_RCPT = sx->ok;
3746 tctx.smtp_context = sx;
3749 tctx.options |= topt_end_dot;
3751 /* Save the first address of the next batch. */
3752 sx->first_addr = sx->next_addr;
3754 /* Responses from CHUNKING commands go in buffer. Otherwise,
3755 there has not been a response. */
3759 sigalrm_seen = FALSE;
3760 transport_write_timeout = ob->data_timeout;
3761 smtp_command = US"sending data block"; /* For error messages */
3762 DEBUG(D_transport|D_v)
3763 if (sx->peer_offered & OPTION_CHUNKING)
3764 debug_printf(" will write message using CHUNKING\n");
3766 debug_printf(" SMTP>> writing message and terminating \".\"\n");
3767 transport_count = 0;
3769 #ifndef DISABLE_DKIM
3771 # ifdef MEASURE_TIMING
3773 gettimeofday(&t0, NULL);
3775 dkim_exim_sign_init();
3776 # ifdef EXPERIMENTAL_ARC
3778 uschar * s = ob->arc_sign;
3781 if (!(ob->dkim.arc_signspec = s = expand_string(s)))
3783 if (!f.expand_string_forcedfail)
3785 message = US"failed to expand arc_sign";
3792 /* Ask dkim code to hash the body for ARC */
3793 (void) arc_ams_setup_sign_bodyhash();
3794 ob->dkim.force_bodyhash = TRUE;
3799 # ifdef MEASURE_TIMING
3800 report_time_since(&t0, US"dkim_exim_sign_init (delta)");
3803 sx->ok = dkim_transport_write_message(&tctx, &ob->dkim, CUSS &message);
3805 sx->ok = transport_write_message(&tctx, 0);
3808 /* transport_write_message() uses write() because it is called from other
3809 places to write to non-sockets. This means that under some OS (e.g. Solaris)
3810 it can exit with "Broken pipe" as its error. This really means that the
3811 socket got closed at the far end. */
3813 transport_write_timeout = 0; /* for subsequent transports */
3815 /* Failure can either be some kind of I/O disaster (including timeout),
3816 or the failure of a transport filter or the expansion of added headers.
3817 Or, when CHUNKING, it can be a protocol-detected failure. */
3820 if (message) goto SEND_FAILED;
3821 else goto RESPONSE_FAILED;
3823 /* We used to send the terminating "." explicitly here, but because of
3824 buffering effects at both ends of TCP/IP connections, you don't gain
3825 anything by keeping it separate, so it might as well go in the final
3826 data buffer for efficiency. This is now done by setting the topt_end_dot
3829 smtp_command = US"end of data";
3831 if (sx->peer_offered & OPTION_CHUNKING && sx->cmd_count > 1)
3833 /* Reap any outstanding MAIL & RCPT commands, but not a DATA-go-ahead */
3834 switch(sync_responses(sx, sx->cmd_count-1, 0))
3836 case 3: sx->ok = TRUE; /* 2xx & 5xx => OK & progress made */
3837 case 2: sx->completed_addr = TRUE; /* 5xx (only) => progress made */
3840 case 1: sx->ok = TRUE; /* 2xx (only) => OK, but if LMTP, */
3841 if (!sx->lmtp) sx->completed_addr = TRUE; /* can't tell about progress yet */
3842 case 0: break; /* No 2xx or 5xx, but no probs */
3844 case -1: goto END_OFF; /* Timeout on RCPT */
3846 #ifndef DISABLE_PIPE_CONNECT
3847 case -5: /* TLS first-read error */
3848 case -4: HDEBUG(D_transport)
3849 debug_printf("failed reaping pipelined cmd responses\n");
3851 default: goto RESPONSE_FAILED; /* I/O error, or any MAIL/DATA error */
3855 #ifndef DISABLE_PRDR
3856 /* For PRDR we optionally get a partial-responses warning followed by the
3857 individual responses, before going on with the overall response. If we don't
3858 get the warning then deal with per non-PRDR. */
3862 sx->ok = smtp_read_response(sx, sx->buffer, sizeof(sx->buffer), '3', ob->final_timeout);
3863 if (!sx->ok && errno == 0) switch(sx->buffer[0])
3865 case '2': sx->prdr_active = FALSE;
3868 case '4': errno = ERRNO_DATA4XX;
3869 addrlist->more_errno |=
3870 ((sx->buffer[1] - '0')*10 + sx->buffer[2] - '0') << 8;
3877 /* For non-PRDR SMTP, we now read a single response that applies to the
3878 whole message. If it is OK, then all the addresses have been delivered. */
3882 sx->ok = smtp_read_response(sx, sx->buffer, sizeof(sx->buffer), '2',
3884 if (!sx->ok && errno == 0 && sx->buffer[0] == '4')
3886 errno = ERRNO_DATA4XX;
3887 addrlist->more_errno |= ((sx->buffer[1] - '0')*10 + sx->buffer[2] - '0') << 8;
3891 /* For LMTP, we get back a response for every RCPT command that we sent;
3892 some may be accepted and some rejected. For those that get a response, their
3893 status is fixed; any that are accepted have been handed over, even if later
3894 responses crash - at least, that's how I read RFC 2033.
3896 If all went well, mark the recipient addresses as completed, record which
3897 host/IPaddress they were delivered to, and cut out RSET when sending another
3898 message down the same channel. Write the completed addresses to the journal
3899 now so that they are recorded in case there is a crash of hardware or
3900 software before the spool gets updated. Also record the final SMTP
3901 confirmation if needed (for SMTP only). */
3906 struct timeval delivery_time;
3908 uschar * conf = NULL;
3910 timesince(&delivery_time, &sx->delivery_start);
3911 sx->send_rset = FALSE;
3912 pipelining_active = FALSE;
3914 /* Set up confirmation if needed - applies only to SMTP */
3917 #ifdef DISABLE_EVENT
3918 LOGGING(smtp_confirmation) &&
3923 const uschar *s = string_printing(sx->buffer);
3924 /* deconst cast ok here as string_printing was checked to have alloc'n'copied */
3925 conf = (s == sx->buffer)? US string_copy(s) : US s;
3928 /* Process all transported addresses - for LMTP or PRDR, read a status for
3929 each one. We used to drop out at first_addr, until someone returned a 452
3930 followed by a 250... and we screwed up the accepted addresses. */
3932 for (address_item * addr = addrlist; addr; addr = addr->next)
3934 if (addr->transport_return != PENDING_OK) continue;
3936 /* LMTP - if the response fails badly (e.g. timeout), use it for all the
3937 remaining addresses. Otherwise, it's a return code for just the one
3938 address. For temporary errors, add a retry item for the address so that
3939 it doesn't get tried again too soon. */
3941 #ifndef DISABLE_PRDR
3942 if (sx->lmtp || sx->prdr_active)
3947 if (!smtp_read_response(sx, sx->buffer, sizeof(sx->buffer), '2',
3950 if (errno != 0 || sx->buffer[0] == 0) goto RESPONSE_FAILED;
3951 addr->message = string_sprintf(
3952 #ifndef DISABLE_PRDR
3953 "%s error after %s: %s", sx->prdr_active ? "PRDR":"LMTP",
3955 "LMTP error after %s: %s",
3957 data_command, string_printing(sx->buffer));
3958 setflag(addr, af_pass_message); /* Allow message to go to user */
3959 if (sx->buffer[0] == '5')
3960 addr->transport_return = FAIL;
3963 errno = ERRNO_DATA4XX;
3964 addr->more_errno |= ((sx->buffer[1] - '0')*10 + sx->buffer[2] - '0') << 8;
3965 addr->transport_return = DEFER;
3966 #ifndef DISABLE_PRDR
3967 if (!sx->prdr_active)
3969 retry_add_item(addr, addr->address_retry_key, 0);
3973 sx->completed_addr = TRUE; /* NOW we can set this flag */
3974 if (LOGGING(smtp_confirmation))
3976 const uschar *s = string_printing(sx->buffer);
3977 /* deconst cast ok here as string_printing was checked to have alloc'n'copied */
3978 conf = (s == sx->buffer) ? US string_copy(s) : US s;
3982 /* SMTP, or success return from LMTP for this address. Pass back the
3983 actual host that was used. */
3985 addr->transport_return = OK;
3986 addr->host_used = host;
3987 addr->delivery_time = delivery_time;
3988 addr->special_action = flag;
3989 addr->message = conf;
3991 if (tcp_out_fastopen)
3993 setflag(addr, af_tcp_fastopen_conn);
3994 if (tcp_out_fastopen >= TFO_USED_NODATA) setflag(addr, af_tcp_fastopen);
3995 if (tcp_out_fastopen >= TFO_USED_DATA) setflag(addr, af_tcp_fastopen_data);
3997 if (sx->pipelining_used) setflag(addr, af_pipelining);
3998 #ifndef DISABLE_PIPE_CONNECT
3999 if (sx->early_pipe_active) setflag(addr, af_early_pipe);
4001 #ifndef DISABLE_PRDR
4002 if (sx->prdr_active) setflag(addr, af_prdr_used);
4004 if (sx->peer_offered & OPTION_CHUNKING) setflag(addr, af_chunking_used);
4007 #ifndef DISABLE_PRDR
4008 if (!sx->prdr_active)
4011 /* Update the journal. For homonymic addresses, use the base address plus
4012 the transport name. See lots of comments in deliver.c about the reasons
4013 for the complications when homonyms are involved. Just carry on after
4014 write error, as it may prove possible to update the spool file later. */
4016 if (testflag(addr, af_homonym))
4017 sprintf(CS sx->buffer, "%.500s/%s\n", addr->unique + 3, tblock->name);
4019 sprintf(CS sx->buffer, "%.500s\n", addr->unique);
4021 DEBUG(D_deliver) debug_printf("S:journalling %s\n", sx->buffer);
4022 len = Ustrlen(CS sx->buffer);
4023 if (write(journal_fd, sx->buffer, len) != len)
4024 log_write(0, LOG_MAIN|LOG_PANIC, "failed to write journal for "
4025 "%s: %s", sx->buffer, strerror(errno));
4029 #ifndef DISABLE_PRDR
4030 if (sx->prdr_active)
4032 const uschar * overall_message;
4034 /* PRDR - get the final, overall response. For any non-success
4035 upgrade all the address statuses. */
4037 sx->ok = smtp_read_response(sx, sx->buffer, sizeof(sx->buffer), '2',
4041 if(errno == 0 && sx->buffer[0] == '4')
4043 errno = ERRNO_DATA4XX;
4044 addrlist->more_errno |= ((sx->buffer[1] - '0')*10 + sx->buffer[2] - '0') << 8;
4046 for (address_item * addr = addrlist; addr != sx->first_addr; addr = addr->next)
4047 if (sx->buffer[0] == '5' || addr->transport_return == OK)
4048 addr->transport_return = PENDING_OK; /* allow set_errno action */
4049 goto RESPONSE_FAILED;
4052 /* Append the overall response to the individual PRDR response for logging
4053 and update the journal, or setup retry. */
4055 overall_message = string_printing(sx->buffer);
4056 for (address_item * addr = addrlist; addr != sx->first_addr; addr = addr->next)
4057 if (addr->transport_return == OK)
4058 addr->message = string_sprintf("%s\\n%s", addr->message, overall_message);
4060 for (address_item * addr = addrlist; addr != sx->first_addr; addr = addr->next)
4061 if (addr->transport_return == OK)
4063 if (testflag(addr, af_homonym))
4064 sprintf(CS sx->buffer, "%.500s/%s\n", addr->unique + 3, tblock->name);
4066 sprintf(CS sx->buffer, "%.500s\n", addr->unique);
4068 DEBUG(D_deliver) debug_printf("journalling(PRDR) %s\n", sx->buffer);
4069 len = Ustrlen(CS sx->buffer);
4070 if (write(journal_fd, sx->buffer, len) != len)
4071 log_write(0, LOG_MAIN|LOG_PANIC, "failed to write journal for "
4072 "%s: %s", sx->buffer, strerror(errno));
4074 else if (addr->transport_return == DEFER)
4075 retry_add_item(addr, addr->address_retry_key, -2);
4079 /* Ensure the journal file is pushed out to disk. */
4081 if (EXIMfsync(journal_fd) < 0)
4082 log_write(0, LOG_MAIN|LOG_PANIC, "failed to fsync journal: %s",
4088 /* Handle general (not specific to one address) failures here. The value of ok
4089 is used to skip over this code on the falling through case. A timeout causes a
4090 deferral. Other errors may defer or fail according to the response code, and
4091 may set up a special errno value, e.g. after connection chopped, which is
4092 assumed if errno == 0 and there is no text in the buffer. If control reaches
4093 here during the setting up phase (i.e. before MAIL FROM) then always defer, as
4094 the problem is not related to this specific message. */
4099 uschar * set_message;
4105 sx->send_quit = check_response(host, &save_errno, addrlist->more_errno,
4106 sx->buffer, &code, &message, &pass_message);
4114 message = string_sprintf("send() to %s [%s] failed: %s",
4115 host->name, host->address, message ? message : US strerror(save_errno));
4116 sx->send_quit = FALSE;
4124 sx->ok = FALSE; /* For when reached by GOTO */
4125 set_message = message;
4127 /* We want to handle timeouts after MAIL or "." and loss of connection after
4128 "." specially. They can indicate a problem with the sender address or with
4129 the contents of the message rather than a real error on the connection. These
4130 cases are treated in the same way as a 4xx response. This next bit of code
4131 does the classification. */
4138 message_error = TRUE;
4142 message_error = Ustrncmp(smtp_command,"MAIL",4) == 0 ||
4143 Ustrncmp(smtp_command,"end ",4) == 0;
4146 case ERRNO_SMTPCLOSED:
4147 message_error = Ustrncmp(smtp_command,"end ",4) == 0;
4151 message_error = FALSE;
4155 /* Handle the cases that are treated as message errors. These are:
4157 (a) negative response or timeout after MAIL
4158 (b) negative response after DATA
4159 (c) negative response or timeout or dropped connection after "."
4160 (d) utf8 support required and not offered
4162 It won't be a negative response or timeout after RCPT, as that is dealt
4163 with separately above. The action in all cases is to set an appropriate
4164 error code for all the addresses, but to leave yield set to OK because the
4165 host itself has not failed. Of course, it might in practice have failed
4166 when we've had a timeout, but if so, we'll discover that at the next
4167 delivery attempt. For a temporary error, set the message_defer flag, and
4168 write to the logs for information if this is not the last host. The error
4169 for the last host will be logged as part of the address's log line. */
4173 if (mua_wrapper) code = '5'; /* Force hard failure in wrapper mode */
4175 /* If there's an errno, the message contains just the identity of
4180 else /* Anything other than 5 is treated as temporary */
4184 message = US string_sprintf("%s: %s", message, strerror(save_errno));
4186 write_logs(host, message, sx->first_addr ? sx->first_addr->basic_errno : 0);
4188 *message_defer = TRUE;
4192 /* Otherwise, we have an I/O error or a timeout other than after MAIL or
4193 ".", or some other transportation error. We defer all addresses and yield
4194 DEFER, except for the case of failed add_headers expansion, or a transport
4195 filter failure, when the yield should be ERROR, to stop it trying other
4200 #ifndef DISABLE_PIPE_CONNECT
4201 /* If we were early-pipelinng and the actual EHLO response did not match
4202 the cached value we assumed, we could have detected it and passed a
4203 custom errno through to here. It would be nice to RSET and retry right
4204 away, but to reliably do that we eould need an extra synch point before
4205 we committed to data and that would discard half the gained roundrips.
4206 Or we could summarily drop the TCP connection. but that is also ugly.
4207 Instead, we ignore the possibility (having freshened the cache) and rely
4208 on the server telling us with a nonmessage error if we have tried to
4209 do something it no longer supports. */
4212 yield = (save_errno == ERRNO_CHHEADER_FAIL ||
4213 save_errno == ERRNO_FILTER_FAIL) ? ERROR : DEFER;
4217 set_errno(addrlist, save_errno, set_message, set_rc, pass_message, host,
4218 #ifdef EXPERIMENTAL_DSN_INFO
4219 sx->smtp_greeting, sx->helo_response,
4221 &sx->delivery_start);
4224 /* If all has gone well, send_quit will be set TRUE, implying we can end the
4225 SMTP session tidily. However, if there were too many addresses to send in one
4226 message (indicated by first_addr being non-NULL) we want to carry on with the
4227 rest of them. Also, it is desirable to send more than one message down the SMTP
4228 connection if there are several waiting, provided we haven't already sent so
4229 many as to hit the configured limit. The function transport_check_waiting looks
4230 for a waiting message and returns its id. Then transport_pass_socket tries to
4231 set up a continued delivery by passing the socket on to another process. The
4232 variable send_rset is FALSE if a message has just been successfully transferred.
4234 If we are already sending down a continued channel, there may be further
4235 addresses not yet delivered that are aimed at the same host, but which have not
4236 been passed in this run of the transport. In this case, continue_more will be
4237 true, and all we should do is send RSET if necessary, and return, leaving the
4240 However, if no address was disposed of, i.e. all addresses got 4xx errors, we
4241 do not want to continue with other messages down the same channel, because that
4242 can lead to looping between two or more messages, all with the same,
4243 temporarily failing address(es). [The retry information isn't updated yet, so
4244 new processes keep on trying.] We probably also don't want to try more of this
4245 message's addresses either.
4247 If we have started a TLS session, we have to end it before passing the
4248 connection to a new process. However, not all servers can handle this (Exim
4249 can), so we do not pass such a connection on if the host matches
4250 hosts_nopass_tls. */
4253 debug_printf("ok=%d send_quit=%d send_rset=%d continue_more=%d "
4254 "yield=%d first_address is %sNULL\n", sx->ok, sx->send_quit,
4255 sx->send_rset, f.continue_more, yield, sx->first_addr ? "not " : "");
4257 if (sx->completed_addr && sx->ok && sx->send_quit)
4260 smtp_compare_t t_compare;
4262 t_compare.tblock = tblock;
4263 t_compare.current_sender_address = sender_address;
4265 if ( sx->first_addr != NULL /* more addrs for this message */
4266 || f.continue_more /* more addrs for coninued-host */
4269 ( tls_out.active.sock < 0 && !continue_proxy_cipher
4270 || verify_check_given_host(CUSS &ob->hosts_nopass_tls, host) != OK
4274 transport_check_waiting(tblock->name, host->name,
4275 tblock->connection_max_messages, new_message_id, &more,
4276 (oicf)smtp_are_same_identities, (void*)&t_compare)
4283 if (! (sx->ok = smtp_write_command(sx, SCMD_FLUSH, "RSET\r\n") >= 0))
4285 msg = US string_sprintf("send() to %s [%s] failed: %s", host->name,
4286 host->address, strerror(errno));
4287 sx->send_quit = FALSE;
4289 else if (! (sx->ok = smtp_read_response(sx, sx->buffer, sizeof(sx->buffer),
4290 '2', ob->command_timeout)))
4293 sx->send_quit = check_response(host, &errno, 0, sx->buffer, &code, &msg,
4297 DEBUG(D_transport) debug_printf("H=%s [%s] %s\n",
4298 host->name, host->address, msg);
4302 /* Either RSET was not needed, or it succeeded */
4309 int socket_fd = sx->cctx.sock;
4312 if (sx->first_addr != NULL) /* More addresses still to be sent */
4313 { /* for this message */
4314 continue_sequence++; /* Causes * in logging */
4315 pipelining_active = sx->pipelining_used; /* was cleared at DATA */
4319 /* Unless caller said it already has more messages listed for this host,
4320 pass the connection on to a new Exim process (below, the call to
4321 transport_pass_socket). If the caller has more ready, just return with
4322 the connection still open. */
4325 if (tls_out.active.sock >= 0)
4326 if ( f.continue_more
4327 || verify_check_given_host(CUSS &ob->hosts_noproxy_tls, host) == OK)
4329 /* Before passing the socket on, or returning to caller with it still
4330 open, we must shut down TLS. Not all MTAs allow for the continuation
4331 of the SMTP session when TLS is shut down. We test for this by sending
4332 a new EHLO. If we don't get a good response, we don't attempt to pass
4335 tls_close(sx->cctx.tls_ctx, TLS_SHUTDOWN_WAIT);
4336 sx->cctx.tls_ctx = NULL;
4337 tls_out.active.sock = -1;
4338 smtp_peer_options = smtp_peer_options_wrap;
4340 && smtp_write_command(sx, SCMD_FLUSH, "EHLO %s\r\n", sx->helo_data)
4342 && smtp_read_response(sx, sx->buffer, sizeof(sx->buffer),
4343 '2', ob->command_timeout);
4345 if (sx->ok && f.continue_more)
4346 goto TIDYUP; /* More addresses for another run */
4350 /* Set up a pipe for proxying TLS for the new transport process */
4352 smtp_peer_options |= OPTION_TLS;
4353 if ((sx->ok = socketpair(AF_UNIX, SOCK_STREAM, 0, pfd) == 0))
4356 set_errno(sx->first_addr, errno, US"internal allocation problem",
4358 # ifdef EXPERIMENTAL_DSN_INFO
4359 sx->smtp_greeting, sx->helo_response,
4361 &sx->delivery_start);
4365 if (f.continue_more)
4366 goto TIDYUP; /* More addresses for another run */
4368 /* If the socket is successfully passed, we mustn't send QUIT (or
4369 indeed anything!) from here. */
4371 /*XXX DSN_INFO: assume likely to do new HELO; but for greet we'll want to
4372 propagate it from the initial
4374 if (sx->ok && transport_pass_socket(tblock->name, host->name,
4375 host->address, new_message_id, socket_fd))
4377 sx->send_quit = FALSE;
4379 /* We have passed the client socket to a fresh transport process.
4380 If TLS is still active, we need to proxy it for the transport we
4381 just passed the baton to. Fork a child to to do it, and return to
4382 get logging done asap. Which way to place the work makes assumptions
4383 about post-fork prioritisation which may not hold on all platforms. */
4385 if (tls_out.active.sock >= 0)
4387 int pid = exim_fork(US"tls-proxy-interproc");
4388 if (pid == 0) /* child; fork again to disconnect totally */
4390 /* does not return */
4391 smtp_proxy_tls(sx->cctx.tls_ctx, sx->buffer, sizeof(sx->buffer), pfd,
4392 ob->command_timeout);
4395 if (pid > 0) /* parent */
4398 /* tidy the inter-proc to disconn the proxy proc */
4399 waitpid(pid, NULL, 0);
4400 tls_close(sx->cctx.tls_ctx, TLS_NO_SHUTDOWN);
4401 sx->cctx.tls_ctx = NULL;
4402 (void)close(sx->cctx.sock);
4404 continue_transport = NULL;
4405 continue_hostname = NULL;
4408 log_write(0, LOG_PANIC_DIE, "fork failed");
4414 /* If RSET failed and there are addresses left, they get deferred. */
4416 set_errno(sx->first_addr, errno, msg, DEFER, FALSE, host,
4417 #ifdef EXPERIMENTAL_DSN_INFO
4418 sx->smtp_greeting, sx->helo_response,
4420 &sx->delivery_start);
4424 /* End off tidily with QUIT unless the connection has died or the socket has
4425 been passed to another process. There has been discussion on the net about what
4426 to do after sending QUIT. The wording of the RFC suggests that it is necessary
4427 to wait for a response, but on the other hand, there isn't anything one can do
4428 with an error response, other than log it. Exim used to do that. However,
4429 further discussion suggested that it is positively advantageous not to wait for
4430 the response, but to close the session immediately. This is supposed to move
4431 the TCP/IP TIME_WAIT state from the server to the client, thereby removing some
4432 load from the server. (Hosts that are both servers and clients may not see much
4433 difference, of course.) Further discussion indicated that this was safe to do
4434 on Unix systems which have decent implementations of TCP/IP that leave the
4435 connection around for a while (TIME_WAIT) after the application has gone away.
4436 This enables the response sent by the server to be properly ACKed rather than
4437 timed out, as can happen on broken TCP/IP implementations on other OS.
4439 This change is being made on 31-Jul-98. After over a year of trouble-free
4440 operation, the old commented-out code was removed on 17-Sep-99. */
4444 (void) setsockopt(sx->cctx.sock, IPPROTO_TCP, TCP_CORK, US &on, sizeof(on));
4446 if (sx->send_quit) (void)smtp_write_command(sx, SCMD_FLUSH, "QUIT\r\n");
4451 tls_close(sx->cctx.tls_ctx, TLS_SHUTDOWN_NOWAIT);
4452 sx->cctx.tls_ctx = NULL;
4455 /* Close the socket, and return the appropriate value, first setting
4456 works because the NULL setting is passed back to the calling process, and
4457 remote_max_parallel is forced to 1 when delivering over an existing connection,
4459 If all went well and continue_more is set, we shouldn't actually get here if
4460 there are further addresses, as the return above will be taken. However,
4461 writing RSET might have failed, or there may be other addresses whose hosts are
4462 specified in the transports, and therefore not visible at top level, in which
4463 case continue_more won't get set. */
4465 HDEBUG(D_transport|D_acl|D_v) debug_printf_indent(" SMTP(close)>>\n");
4468 shutdown(sx->cctx.sock, SHUT_WR);
4470 testharness_pause_ms(200);
4471 if (fcntl(sx->cctx.sock, F_SETFL, O_NONBLOCK) == 0)
4472 for (int i = 16; read(sx->cctx.sock, sx->inbuffer, sizeof(sx->inbuffer)) > 0 && i > 0;)
4473 i--; /* drain socket */
4475 (void)close(sx->cctx.sock);
4477 #ifndef DISABLE_EVENT
4478 (void) event_raise(tblock->event_action, US"tcp:close", NULL);
4484 sx->first_addr = NULL;
4485 for (address_item * a = sx->addrlist->next; a; a = a->next)
4486 if (a->transport_return == DANE)
4488 a->transport_return = PENDING_DEFER;
4489 if (!sx->first_addr)
4491 /* Remember the new start-point in the addrlist, for smtp_setup_conn()
4492 to get the domain string for SNI */
4495 DEBUG(D_transport) debug_printf("DANE: go-around for %s\n", a->domain);
4502 continue_transport = NULL;
4503 continue_hostname = NULL;
4508 if (dane_held) for (address_item * a = sx->addrlist->next; a; a = a->next)
4509 if (a->transport_return == DANE)
4510 a->transport_return = PENDING_DEFER;
4518 /*************************************************
4519 * Closedown entry point *
4520 *************************************************/
4522 /* This function is called when exim is passed an open smtp channel
4523 from another incarnation, but the message which it has been asked
4524 to deliver no longer exists. The channel is on stdin.
4526 We might do fancy things like looking for another message to send down
4527 the channel, but if the one we sought has gone, it has probably been
4528 delivered by some other process that itself will seek further messages,
4529 so just close down our connection.
4531 Argument: pointer to the transport instance block
4536 smtp_transport_closedown(transport_instance *tblock)
4538 smtp_transport_options_block * ob = SOB tblock->options_block;
4539 client_conn_ctx cctx;
4542 uschar inbuffer[4096];
4543 uschar outbuffer[16];
4545 /*XXX really we need an active-smtp-client ctx, rather than assuming stdout */
4546 cctx.sock = fileno(stdin);
4547 cctx.tls_ctx = cctx.sock == tls_out.active.sock ? tls_out.active.tls_ctx : NULL;
4549 sx.inblock.cctx = &cctx;
4550 sx.inblock.buffer = inbuffer;
4551 sx.inblock.buffersize = sizeof(inbuffer);
4552 sx.inblock.ptr = inbuffer;
4553 sx.inblock.ptrend = inbuffer;
4555 sx.outblock.cctx = &cctx;
4556 sx.outblock.buffersize = sizeof(outbuffer);
4557 sx.outblock.buffer = outbuffer;
4558 sx.outblock.ptr = outbuffer;
4559 sx.outblock.cmd_count = 0;
4560 sx.outblock.authenticating = FALSE;
4562 (void)smtp_write_command(&sx, SCMD_FLUSH, "QUIT\r\n");
4563 (void)smtp_read_response(&sx, buffer, sizeof(buffer), '2', ob->command_timeout);
4564 (void)close(cctx.sock);
4569 /*************************************************
4570 * Prepare addresses for delivery *
4571 *************************************************/
4573 /* This function is called to flush out error settings from previous delivery
4574 attempts to other hosts. It also records whether we got here via an MX record
4575 or not in the more_errno field of the address. We are interested only in
4576 addresses that are still marked DEFER - others may have got delivered to a
4577 previously considered IP address. Set their status to PENDING_DEFER to indicate
4578 which ones are relevant this time.
4581 addrlist the list of addresses
4582 host the host we are delivering to
4584 Returns: the first address for this delivery
4587 static address_item *
4588 prepare_addresses(address_item *addrlist, host_item *host)
4590 address_item *first_addr = NULL;
4591 for (address_item * addr = addrlist; addr; addr = addr->next)
4592 if (addr->transport_return == DEFER)
4594 if (!first_addr) first_addr = addr;
4595 addr->transport_return = PENDING_DEFER;
4596 addr->basic_errno = 0;
4597 addr->more_errno = (host->mx >= 0)? 'M' : 'A';
4598 addr->message = NULL;
4600 addr->cipher = NULL;
4601 addr->ourcert = NULL;
4602 addr->peercert = NULL;
4603 addr->peerdn = NULL;
4604 addr->ocsp = OCSP_NOT_REQ;
4605 addr->tlsver = NULL;
4607 #ifdef EXPERIMENTAL_DSN_INFO
4608 addr->smtp_greeting = NULL;
4609 addr->helo_response = NULL;
4617 /*************************************************
4618 * Main entry point *
4619 *************************************************/
4621 /* See local README for interface details. As this is a remote transport, it is
4622 given a chain of addresses to be delivered in one connection, if possible. It
4623 always returns TRUE, indicating that each address has its own independent
4624 status set, except if there is a setting up problem, in which case it returns
4628 smtp_transport_entry(
4629 transport_instance *tblock, /* data for this instantiation */
4630 address_item *addrlist) /* addresses we are working on */
4633 int hosts_defer = 0;
4635 int hosts_looked_up = 0;
4636 int hosts_retry = 0;
4637 int hosts_serial = 0;
4638 int hosts_total = 0;
4639 int total_hosts_tried = 0;
4640 BOOL expired = TRUE;
4641 uschar *expanded_hosts = NULL;
4643 uschar *tid = string_sprintf("%s transport", tblock->name);
4644 smtp_transport_options_block *ob = SOB tblock->options_block;
4645 host_item *hostlist = addrlist->host_list;
4646 host_item *host = NULL;
4650 debug_printf("%s transport entered\n", tblock->name);
4651 for (address_item * addr = addrlist; addr; addr = addr->next)
4652 debug_printf(" %s\n", addr->address);
4655 debug_printf("hostlist:\n");
4656 for (host_item * host = hostlist; host; host = host->next)
4657 debug_printf(" '%s' IP %s port %d\n", host->name, host->address, host->port);
4659 if (continue_hostname)
4660 debug_printf("already connected to %s [%s] (on fd %d)\n",
4661 continue_hostname, continue_host_address,
4662 cutthrough.cctx.sock >= 0 ? cutthrough.cctx.sock : 0);
4665 /* Set the flag requesting that these hosts be added to the waiting
4666 database if the delivery fails temporarily or if we are running with
4667 queue_smtp or a 2-stage queue run. This gets unset for certain
4668 kinds of error, typically those that are specific to the message. */
4670 update_waiting = TRUE;
4672 /* If a host list is not defined for the addresses - they must all have the
4673 same one in order to be passed to a single transport - or if the transport has
4674 a host list with hosts_override set, use the host list supplied with the
4675 transport. It is an error for this not to exist. */
4677 if (!hostlist || (ob->hosts_override && ob->hosts))
4681 addrlist->message = string_sprintf("%s transport called with no hosts set",
4683 addrlist->transport_return = PANIC;
4684 return FALSE; /* Only top address has status */
4687 DEBUG(D_transport) debug_printf("using the transport's hosts: %s\n",
4690 /* If the transport's host list contains no '$' characters, and we are not
4691 randomizing, it is fixed and therefore a chain of hosts can be built once
4692 and for all, and remembered for subsequent use by other calls to this
4693 transport. If, on the other hand, the host list does contain '$', or we are
4694 randomizing its order, we have to rebuild it each time. In the fixed case,
4695 as the hosts string will never be used again, it doesn't matter that we
4696 replace all the : characters with zeros. */
4700 uschar *s = ob->hosts;
4702 if (Ustrchr(s, '$') != NULL)
4704 if (!(expanded_hosts = expand_string(s)))
4706 addrlist->message = string_sprintf("failed to expand list of hosts "
4707 "\"%s\" in %s transport: %s", s, tblock->name, expand_string_message);
4708 addrlist->transport_return = f.search_find_defer ? DEFER : PANIC;
4709 return FALSE; /* Only top address has status */
4711 DEBUG(D_transport) debug_printf("expanded list of hosts \"%s\" to "
4712 "\"%s\"\n", s, expanded_hosts);
4716 if (ob->hosts_randomize) s = expanded_hosts = string_copy(s);
4718 if (is_tainted2(s, LOG_MAIN|LOG_PANIC, "Tainted host list '%s' from '%s' in transport %s", s, ob->hosts, tblock->name))
4720 /* Avoid leaking info to an attacker */
4721 addrlist->message = US"internal configuration error";
4722 addrlist->transport_return = PANIC;
4726 host_build_hostlist(&hostlist, s, ob->hosts_randomize);
4728 /* Check that the expansion yielded something useful. */
4732 string_sprintf("%s transport has empty hosts setting", tblock->name);
4733 addrlist->transport_return = PANIC;
4734 return FALSE; /* Only top address has status */
4737 /* If there was no expansion of hosts, save the host list for
4740 if (!expanded_hosts) ob->hostlist = hostlist;
4743 /* This is not the first time this transport has been run in this delivery;
4744 the host list was built previously. */
4747 hostlist = ob->hostlist;
4750 /* The host list was supplied with the address. If hosts_randomize is set, we
4751 must sort it into a random order if it did not come from MX records and has not
4752 already been randomized (but don't bother if continuing down an existing
4755 else if (ob->hosts_randomize && hostlist->mx == MX_NONE && !continue_hostname)
4757 host_item *newlist = NULL;
4760 host_item *h = hostlist;
4761 hostlist = hostlist->next;
4763 h->sort_key = random_number(100);
4770 else if (h->sort_key < newlist->sort_key)
4777 host_item *hh = newlist;
4780 if (h->sort_key < hh->next->sort_key) break;
4788 hostlist = addrlist->host_list = newlist;
4791 /* Sort out the default port. */
4793 if (!smtp_get_port(ob->port, addrlist, &defport, tid)) return FALSE;
4795 /* For each host-plus-IP-address on the list:
4797 . If this is a continued delivery and the host isn't the one with the
4798 current connection, skip.
4800 . If the status is unusable (i.e. previously failed or retry checked), skip.
4802 . If no IP address set, get the address, either by turning the name into
4803 an address, calling gethostbyname if gethostbyname is on, or by calling
4804 the DNS. The DNS may yield multiple addresses, in which case insert the
4805 extra ones into the list.
4807 . Get the retry data if not previously obtained for this address and set the
4808 field which remembers the state of this address. Skip if the retry time is
4809 not reached. If not, remember whether retry data was found. The retry string
4810 contains both the name and the IP address.
4812 . Scan the list of addresses and mark those whose status is DEFER as
4813 PENDING_DEFER. These are the only ones that will be processed in this cycle
4816 . Make a delivery attempt - addresses marked PENDING_DEFER will be tried.
4817 Some addresses may be successfully delivered, others may fail, and yet
4818 others may get temporary errors and so get marked DEFER.
4820 . The return from the delivery attempt is OK if a connection was made and a
4821 valid SMTP dialogue was completed. Otherwise it is DEFER.
4823 . If OK, add a "remove" retry item for this host/IPaddress, if any.
4825 . If fail to connect, or other defer state, add a retry item.
4827 . If there are any addresses whose status is still DEFER, carry on to the
4828 next host/IPaddress, unless we have tried the number of hosts given
4829 by hosts_max_try or hosts_max_try_hardlimit; otherwise return. Note that
4830 there is some fancy logic for hosts_max_try that means its limit can be
4831 overstepped in some circumstances.
4833 If we get to the end of the list, all hosts have deferred at least one address,
4834 or not reached their retry times. If delay_after_cutoff is unset, it requests a
4835 delivery attempt to those hosts whose last try was before the arrival time of
4836 the current message. To cope with this, we have to go round the loop a second
4837 time. After that, set the status and error data for any addresses that haven't
4838 had it set already. */
4840 for (int cutoff_retry = 0;
4841 expired && cutoff_retry < (ob->delay_after_cutoff ? 1 : 2);
4844 host_item *nexthost = NULL;
4845 int unexpired_hosts_tried = 0;
4846 BOOL continue_host_tried = FALSE;
4848 retry_non_continued:
4849 for (host = hostlist;
4851 && unexpired_hosts_tried < ob->hosts_max_try
4852 && total_hosts_tried < ob->hosts_max_try_hardlimit;
4857 BOOL host_is_expired = FALSE;
4858 BOOL message_defer = FALSE;
4859 BOOL some_deferred = FALSE;
4860 address_item *first_addr = NULL;
4861 uschar *interface = NULL;
4862 uschar *retry_host_key = NULL;
4863 uschar *retry_message_key = NULL;
4864 uschar *serialize_key = NULL;
4866 /* Default next host is next host. :-) But this can vary if the
4867 hosts_max_try limit is hit (see below). It may also be reset if a host
4868 address is looked up here (in case the host was multihomed). */
4870 nexthost = host->next;
4872 /* If the address hasn't yet been obtained from the host name, look it up
4873 now, unless the host is already marked as unusable. If it is marked as
4874 unusable, it means that the router was unable to find its IP address (in
4875 the DNS or wherever) OR we are in the 2nd time round the cutoff loop, and
4876 the lookup failed last time. We don't get this far if *all* MX records
4877 point to non-existent hosts; that is treated as a hard error.
4879 We can just skip this host entirely. When the hosts came from the router,
4880 the address will timeout based on the other host(s); when the address is
4881 looked up below, there is an explicit retry record added.
4883 Note that we mustn't skip unusable hosts if the address is not unset; they
4884 may be needed as expired hosts on the 2nd time round the cutoff loop. */
4888 int new_port, flags;
4890 if (host->status >= hstatus_unusable)
4892 DEBUG(D_transport) debug_printf("%s has no address and is unusable - skipping\n",
4897 DEBUG(D_transport) debug_printf("getting address for %s\n", host->name);
4899 /* The host name is permitted to have an attached port. Find it, and
4900 strip it from the name. Just remember it for now. */
4902 new_port = host_item_get_port(host);
4904 /* Count hosts looked up */
4908 /* Find by name if so configured, or if it's an IP address. We don't
4909 just copy the IP address, because we need the test-for-local to happen. */
4911 flags = HOST_FIND_BY_A | HOST_FIND_BY_AAAA;
4912 if (ob->dns_qualify_single) flags |= HOST_FIND_QUALIFY_SINGLE;
4913 if (ob->dns_search_parents) flags |= HOST_FIND_SEARCH_PARENTS;
4915 if (ob->gethostbyname || string_is_ip_address(host->name, NULL) != 0)
4916 rc = host_find_byname(host, NULL, flags, NULL, TRUE);
4918 rc = host_find_bydns(host, NULL, flags, NULL, NULL, NULL,
4919 &ob->dnssec, /* domains for request/require */
4922 /* Update the host (and any additional blocks, resulting from
4923 multihoming) with a host-specific port, if any. */
4925 for (host_item * hh = host; hh != nexthost; hh = hh->next) hh->port = new_port;
4927 /* Failure to find the host at this time (usually DNS temporary failure)
4928 is really a kind of routing failure rather than a transport failure.
4929 Therefore we add a retry item of the routing kind, not to stop us trying
4930 to look this name up here again, but to ensure the address gets timed
4931 out if the failures go on long enough. A complete failure at this point
4932 commonly points to a configuration error, but the best action is still
4933 to carry on for the next host. */
4935 if (rc == HOST_FIND_AGAIN || rc == HOST_FIND_SECURITY || rc == HOST_FIND_FAILED)
4937 retry_add_item(addrlist, string_sprintf("R:%s", host->name), 0);
4939 if (rc == HOST_FIND_AGAIN) hosts_defer++; else hosts_fail++;
4940 DEBUG(D_transport) debug_printf("rc = %s for %s\n", (rc == HOST_FIND_AGAIN)?
4941 "HOST_FIND_AGAIN" : "HOST_FIND_FAILED", host->name);
4942 host->status = hstatus_unusable;
4944 for (address_item * addr = addrlist; addr; addr = addr->next)
4946 if (addr->transport_return != DEFER) continue;
4947 addr->basic_errno = ERRNO_UNKNOWNHOST;
4948 addr->message = string_sprintf(
4949 rc == HOST_FIND_SECURITY
4950 ? "lookup of IP address for %s was insecure"
4951 : "failed to lookup IP address for %s",
4957 /* If the host is actually the local host, we may have a problem, or
4958 there may be some cunning configuration going on. In the problem case,
4959 log things and give up. The default transport status is already DEFER. */
4961 if (rc == HOST_FOUND_LOCAL && !ob->allow_localhost)
4963 for (address_item * addr = addrlist; addr; addr = addr->next)
4965 addr->basic_errno = ERRNO_HOST_IS_LOCAL;
4966 addr->message = string_sprintf("%s transport found host %s to be "
4967 "local", tblock->name, host->name);
4971 } /* End of block for IP address lookup */
4973 /* If this is a continued delivery, we are interested only in the host
4974 which matches the name of the existing open channel. The check is put
4975 here after the local host lookup, in case the name gets expanded as a
4976 result of the lookup. Set expired FALSE, to save the outer loop executing
4979 if (continue_hostname)
4980 if ( Ustrcmp(continue_hostname, host->name) != 0
4981 || Ustrcmp(continue_host_address, host->address) != 0
4985 continue; /* With next host */
4988 continue_host_tried = TRUE;
4990 /* Reset the default next host in case a multihomed host whose addresses
4991 are not looked up till just above added to the host list. */
4993 nexthost = host->next;
4995 /* If queue_smtp is set (-odqs or the first part of a 2-stage run), or the
4996 domain is in queue_smtp_domains, we don't actually want to attempt any
4997 deliveries. When doing a queue run, queue_smtp_domains is always unset. If
4998 there is a lookup defer in queue_smtp_domains, proceed as if the domain
4999 were not in it. We don't want to hold up all SMTP deliveries! Except when
5000 doing a two-stage queue run, don't do this if forcing. */
5002 if ( (!f.deliver_force || f.queue_2stage)
5004 || match_isinlist(addrlist->domain,
5005 CUSS &queue_smtp_domains, 0,
5006 &domainlist_anchor, NULL, MCL_DOMAIN, TRUE, NULL) == OK)
5009 DEBUG(D_transport) debug_printf("first-pass routing only\n");
5011 for (address_item * addr = addrlist; addr; addr = addr->next)
5012 if (addr->transport_return == DEFER)
5013 addr->message = US"first-pass only routing due to -odqs, "
5014 "queue_smtp_domains or control=queue";
5015 continue; /* With next host */
5018 /* Count hosts being considered - purely for an intelligent comment
5019 if none are usable. */
5023 /* Set $host and $host address now in case they are needed for the
5024 interface expansion or the serialize_hosts check; they remain set if an
5025 actual delivery happens. */
5027 deliver_host = host->name;
5028 deliver_host_address = host->address;
5029 lookup_dnssec_authenticated = host->dnssec == DS_YES ? US"yes"
5030 : host->dnssec == DS_NO ? US"no"
5033 /* Set up a string for adding to the retry key if the port number is not
5034 the standard SMTP port. A host may have its own port setting that overrides
5037 pistring = string_sprintf(":%d", host->port == PORT_NONE
5038 ? defport : host->port);
5039 if (Ustrcmp(pistring, ":25") == 0) pistring = US"";
5041 /* Select IPv4 or IPv6, and choose an outgoing interface. If the interface
5042 string is set, even if constant (as different transports can have different
5043 constant settings), we must add it to the key that is used for retries,
5044 because connections to the same host from a different interface should be
5045 treated separately. */
5047 host_af = Ustrchr(host->address, ':') == NULL ? AF_INET : AF_INET6;
5049 uschar * s = ob->interface;
5052 if (!smtp_get_interface(s, host_af, addrlist, &interface, tid))
5054 pistring = string_sprintf("%s/%s", pistring, interface);
5058 /* The first time round the outer loop, check the status of the host by
5059 inspecting the retry data. The second time round, we are interested only
5060 in expired hosts that haven't been tried since this message arrived. */
5062 if (cutoff_retry == 0)
5065 /* Ensure the status of the address is set by checking retry data if
5066 necessary. There may be host-specific retry data (applicable to all
5067 messages) and also data for retries of a specific message at this host.
5068 If either of these retry records are actually read, the keys used are
5069 returned to save recomputing them later. */
5071 if (exp_bool(addrlist, US"transport", tblock->name, D_transport,
5072 US"retry_include_ip_address", ob->retry_include_ip_address,
5073 ob->expand_retry_include_ip_address, &incl_ip) != OK)
5074 continue; /* with next host */
5076 host_is_expired = retry_check_address(addrlist->domain, host, pistring,
5077 incl_ip, &retry_host_key, &retry_message_key);
5079 DEBUG(D_transport) debug_printf("%s [%s]%s retry-status = %s\n", host->name,
5080 host->address ? host->address : US"", pistring,
5081 host->status == hstatus_usable ? "usable"
5082 : host->status == hstatus_unusable ? "unusable"
5083 : host->status == hstatus_unusable_expired ? "unusable (expired)" : "?");
5085 /* Skip this address if not usable at this time, noting if it wasn't
5086 actually expired, both locally and in the address. */
5088 switch (host->status)
5090 case hstatus_unusable:
5092 setflag(addrlist, af_retry_skipped);
5095 case hstatus_unusable_expired:
5098 case hwhy_retry: hosts_retry++; break;
5099 case hwhy_failed: hosts_fail++; break;
5101 case hwhy_deferred: hosts_defer++; break;
5104 /* If there was a retry message key, implying that previously there
5105 was a message-specific defer, we don't want to update the list of
5106 messages waiting for these hosts. */
5108 if (retry_message_key) update_waiting = FALSE;
5109 continue; /* With the next host or IP address */
5113 /* Second time round the loop: if the address is set but expired, and
5114 the message is newer than the last try, let it through. */
5119 || host->status != hstatus_unusable_expired
5120 || host->last_try > received_time.tv_sec)
5122 DEBUG(D_transport) debug_printf("trying expired host %s [%s]%s\n",
5123 host->name, host->address, pistring);
5124 host_is_expired = TRUE;
5127 /* Setting "expired=FALSE" doesn't actually mean not all hosts are expired;
5128 it remains TRUE only if all hosts are expired and none are actually tried.
5133 /* If this host is listed as one to which access must be serialized,
5134 see if another Exim process has a connection to it, and if so, skip
5135 this host. If not, update the database to record our connection to it
5136 and remember this for later deletion. Do not do any of this if we are
5137 sending the message down a pre-existing connection. */
5139 if ( !continue_hostname
5140 && verify_check_given_host(CUSS &ob->serialize_hosts, host) == OK)
5142 serialize_key = string_sprintf("host-serialize-%s", host->name);
5143 if (!enq_start(serialize_key, 1))
5146 debug_printf("skipping host %s because another Exim process "
5147 "is connected to it\n", host->name);
5153 /* OK, we have an IP address that is not waiting for its retry time to
5154 arrive (it might be expired) OR (second time round the loop) we have an
5155 expired host that hasn't been tried since the message arrived. Have a go
5156 at delivering the message to it. First prepare the addresses by flushing
5157 out the result of previous attempts, and finding the first address that
5158 is still to be delivered. */
5160 first_addr = prepare_addresses(addrlist, host);
5162 DEBUG(D_transport) debug_printf("delivering %s to %s [%s] (%s%s)\n",
5163 message_id, host->name, host->address, addrlist->address,
5164 addrlist->next ? ", ..." : "");
5166 set_process_info("delivering %s to %s [%s]%s (%s%s)",
5167 message_id, host->name, host->address, pistring, addrlist->address,
5168 addrlist->next ? ", ..." : "");
5170 /* This is not for real; don't do the delivery. If there are
5171 any remaining hosts, list them. */
5176 gettimeofday(&now, NULL);
5177 set_errno_nohost(addrlist, 0, NULL, OK, FALSE, &now);
5178 for (address_item * addr = addrlist; addr; addr = addr->next)
5180 addr->host_used = host;
5181 addr->special_action = '*';
5182 addr->message = US"delivery bypassed by -N option";
5186 debug_printf("*** delivery by %s transport bypassed by -N option\n"
5187 "*** host and remaining hosts:\n", tblock->name);
5188 for (host_item * host2 = host; host2; host2 = host2->next)
5189 debug_printf(" %s [%s]\n", host2->name,
5190 host2->address ? host2->address : US"unset");
5195 /* This is for real. If the host is expired, we don't count it for
5196 hosts_max_retry. This ensures that all hosts must expire before an address
5197 is timed out, unless hosts_max_try_hardlimit (which protects against
5198 lunatic DNS configurations) is reached.
5200 If the host is not expired and we are about to hit the hosts_max_retry
5201 limit, check to see if there is a subsequent hosts with a different MX
5202 value. If so, make that the next host, and don't count this one. This is a
5203 heuristic to make sure that different MXs do get tried. With a normal kind
5204 of retry rule, they would get tried anyway when the earlier hosts were
5205 delayed, but if the domain has a "retry every time" type of rule - as is
5206 often used for the the very large ISPs, that won't happen. */
5211 /* Make a copy of the host if it is local to this invocation
5212 of the transport. */
5216 thost = store_get(sizeof(host_item), FALSE);
5218 thost->name = string_copy(host->name);
5219 thost->address = string_copy(host->address);
5224 if (!host_is_expired && ++unexpired_hosts_tried >= ob->hosts_max_try)
5227 debug_printf("hosts_max_try limit reached with this host\n");
5228 for (host_item * h = host; h; h = h->next) if (h->mx != host->mx)
5231 unexpired_hosts_tried--;
5232 DEBUG(D_transport) debug_printf("however, a higher MX host exists "
5233 "and will be tried\n");
5238 /* Attempt the delivery. */
5240 total_hosts_tried++;
5241 rc = smtp_deliver(addrlist, thost, host_af, defport, interface, tblock,
5242 &message_defer, FALSE);
5245 OK => connection made, each address contains its result;
5246 message_defer is set for message-specific defers (when all
5247 recipients are marked defer)
5248 DEFER => there was a non-message-specific delivery problem;
5249 ERROR => there was a problem setting up the arguments for a filter,
5250 or there was a problem with expanding added headers
5253 /* If the result is not OK, there was a non-message-specific problem.
5254 If the result is DEFER, we need to write to the logs saying what happened
5255 for this particular host, except in the case of authentication and TLS
5256 failures, where the log has already been written. If all hosts defer a
5257 general message is written at the end. */
5259 if (rc == DEFER && first_addr->basic_errno != ERRNO_AUTHFAIL
5260 && first_addr->basic_errno != ERRNO_TLSFAILURE)
5261 write_logs(host, first_addr->message, first_addr->basic_errno);
5263 #ifndef DISABLE_EVENT
5265 deferred_event_raise(first_addr, host, US"msg:host:defer");
5268 /* If STARTTLS was accepted, but there was a failure in setting up the
5269 TLS session (usually a certificate screwup), and the host is not in
5270 hosts_require_tls, and tls_tempfail_tryclear is true, try again, with
5271 TLS forcibly turned off. We have to start from scratch with a new SMTP
5272 connection. That's why the retry is done from here, not from within
5273 smtp_deliver(). [Rejections of STARTTLS itself don't screw up the
5274 session, so the in-clear transmission after those errors, if permitted,
5275 happens inside smtp_deliver().] */
5279 && first_addr->basic_errno == ERRNO_TLSFAILURE
5280 && ob->tls_tempfail_tryclear
5281 && verify_check_given_host(CUSS &ob->hosts_require_tls, host) != OK
5284 log_write(0, LOG_MAIN,
5285 "%s: delivering unencrypted to H=%s [%s] (not in hosts_require_tls)",
5286 first_addr->message, host->name, host->address);
5287 first_addr = prepare_addresses(addrlist, host);
5288 rc = smtp_deliver(addrlist, thost, host_af, defport, interface, tblock,
5289 &message_defer, TRUE);
5290 if (rc == DEFER && first_addr->basic_errno != ERRNO_AUTHFAIL)
5291 write_logs(host, first_addr->message, first_addr->basic_errno);
5292 # ifndef DISABLE_EVENT
5294 deferred_event_raise(first_addr, host, US"msg:host:defer");
5297 #endif /*DISABLE_TLS*/
5299 #ifndef DISABLE_EVENT
5300 /* If the last host gave a defer raise a per-message event */
5303 && unexpired_hosts_tried < ob->hosts_max_try
5304 && total_hosts_tried < ob->hosts_max_try_hardlimit
5306 && (message_defer || rc == DEFER)
5308 deferred_event_raise(first_addr, host, US"msg:defer");
5312 /* Delivery attempt finished */
5314 set_process_info("delivering %s: just tried %s [%s]%s for %s%s: result %s",
5315 message_id, host->name, host->address, pistring, addrlist->address,
5316 addrlist->next ? " (& others)" : "", rc_to_string(rc));
5318 /* Release serialization if set up */
5320 if (serialize_key) enq_end(serialize_key);
5322 /* If the result is DEFER, or if a host retry record is known to exist, we
5323 need to add an item to the retry chain for updating the retry database
5324 at the end of delivery. We only need to add the item to the top address,
5325 of course. Also, if DEFER, we mark the IP address unusable so as to skip it
5326 for any other delivery attempts using the same address. (It is copied into
5327 the unusable tree at the outer level, so even if different address blocks
5328 contain the same address, it still won't get tried again.) */
5330 if (rc == DEFER || retry_host_key)
5332 int delete_flag = rc != DEFER ? rf_delete : 0;
5333 if (!retry_host_key)
5336 if (exp_bool(addrlist, US"transport", tblock->name, D_transport,
5337 US"retry_include_ip_address", ob->retry_include_ip_address,
5338 ob->expand_retry_include_ip_address, &incl_ip) != OK)
5339 incl_ip = TRUE; /* error; use most-specific retry record */
5341 retry_host_key = incl_ip
5342 ? string_sprintf("T:%S:%s%s", host->name, host->address, pistring)
5343 : string_sprintf("T:%S%s", host->name, pistring);
5346 /* If a delivery of another message over an existing SMTP connection
5347 yields DEFER, we do NOT set up retry data for the host. This covers the
5348 case when there are delays in routing the addresses in the second message
5349 that are so long that the server times out. This is alleviated by not
5350 routing addresses that previously had routing defers when handling an
5351 existing connection, but even so, this case may occur (e.g. if a
5352 previously happily routed address starts giving routing defers). If the
5353 host is genuinely down, another non-continued message delivery will
5354 notice it soon enough. */
5356 if (delete_flag != 0 || !continue_hostname)
5357 retry_add_item(first_addr, retry_host_key, rf_host | delete_flag);
5359 /* We may have tried an expired host, if its retry time has come; ensure
5360 the status reflects the expiry for the benefit of any other addresses. */
5364 host->status = host_is_expired
5365 ? hstatus_unusable_expired : hstatus_unusable;
5366 host->why = hwhy_deferred;
5370 /* If message_defer is set (host was OK, but every recipient got deferred
5371 because of some message-specific problem), or if that had happened
5372 previously so that a message retry key exists, add an appropriate item
5373 to the retry chain. Note that if there was a message defer but now there is
5374 a host defer, the message defer record gets deleted. That seems perfectly
5375 reasonable. Also, stop the message from being remembered as waiting
5376 for specific hosts. */
5378 if (message_defer || retry_message_key)
5380 int delete_flag = message_defer ? 0 : rf_delete;
5381 if (!retry_message_key)
5384 if (exp_bool(addrlist, US"transport", tblock->name, D_transport,
5385 US"retry_include_ip_address", ob->retry_include_ip_address,
5386 ob->expand_retry_include_ip_address, &incl_ip) != OK)
5387 incl_ip = TRUE; /* error; use most-specific retry record */
5389 retry_message_key = incl_ip
5390 ? string_sprintf("T:%S:%s%s:%s", host->name, host->address, pistring,
5392 : string_sprintf("T:%S%s:%s", host->name, pistring, message_id);
5394 retry_add_item(addrlist, retry_message_key,
5395 rf_message | rf_host | delete_flag);
5396 update_waiting = FALSE;
5399 /* Any return other than DEFER (that is, OK or ERROR) means that the
5400 addresses have got their final statuses filled in for this host. In the OK
5401 case, see if any of them are deferred. */
5404 for (address_item * addr = addrlist; addr; addr = addr->next)
5405 if (addr->transport_return == DEFER)
5407 some_deferred = TRUE;
5411 /* If no addresses deferred or the result was ERROR, return. We do this for
5412 ERROR because a failing filter set-up or add_headers expansion is likely to
5413 fail for any host we try. */
5415 if (rc == ERROR || (rc == OK && !some_deferred))
5417 DEBUG(D_transport) debug_printf("Leaving %s transport\n", tblock->name);
5418 return TRUE; /* Each address has its status */
5421 /* If the result was DEFER or some individual addresses deferred, let
5422 the loop run to try other hosts with the deferred addresses, except for the
5423 case when we were trying to deliver down an existing channel and failed.
5424 Don't try any other hosts in this case. */
5426 if (continue_hostname) break;
5428 /* If the whole delivery, or some individual addresses, were deferred and
5429 there are more hosts that could be tried, do not count this host towards
5430 the hosts_max_try limit if the age of the message is greater than the
5431 maximum retry time for this host. This means we may try try all hosts,
5432 ignoring the limit, when messages have been around for some time. This is
5433 important because if we don't try all hosts, the address will never time
5434 out. NOTE: this does not apply to hosts_max_try_hardlimit. */
5436 if ((rc == DEFER || some_deferred) && nexthost)
5439 retry_config *retry = retry_find_config(host->name, NULL, 0, 0);
5441 if (retry && retry->rules)
5443 retry_rule *last_rule;
5444 for (last_rule = retry->rules;
5446 last_rule = last_rule->next);
5447 timedout = time(NULL) - received_time.tv_sec > last_rule->timeout;
5449 else timedout = TRUE; /* No rule => timed out */
5453 unexpired_hosts_tried--;
5454 DEBUG(D_transport) debug_printf("temporary delivery error(s) override "
5455 "hosts_max_try (message older than host's retry time)\n");
5461 if (unexpired_hosts_tried >= ob->hosts_max_try)
5462 debug_printf("reached transport hosts_max_try limit %d\n",
5464 if (total_hosts_tried >= ob->hosts_max_try_hardlimit)
5465 debug_printf("reached transport hosts_max_try_hardlimit limit %d\n",
5466 ob->hosts_max_try_hardlimit);
5469 testharness_pause_ms(500); /* let server debug out */
5470 } /* End of loop for trying multiple hosts. */
5472 /* If we failed to find a matching host in the list, for an already-open
5473 connection, just close it and start over with the list. This can happen
5474 for routing that changes from run to run, or big multi-IP sites with
5477 if (continue_hostname && !continue_host_tried)
5479 int fd = cutthrough.cctx.sock >= 0 ? cutthrough.cctx.sock : 0;
5481 DEBUG(D_transport) debug_printf("no hosts match already-open connection\n");
5483 /* A TLS conn could be open for a cutthrough, but not for a plain continued-
5485 /*XXX doublecheck that! */
5487 if (cutthrough.cctx.sock >= 0 && cutthrough.is_tls)
5489 (void) tls_write(cutthrough.cctx.tls_ctx, US"QUIT\r\n", 6, FALSE);
5490 tls_close(cutthrough.cctx.tls_ctx, TLS_SHUTDOWN_NOWAIT);
5491 cutthrough.cctx.tls_ctx = NULL;
5492 cutthrough.is_tls = FALSE;
5496 (void) write(fd, US"QUIT\r\n", 6);
5499 cutthrough.cctx.sock = -1;
5500 continue_hostname = NULL;
5501 goto retry_non_continued;
5504 /* This is the end of the loop that repeats iff expired is TRUE and
5505 ob->delay_after_cutoff is FALSE. The second time round we will
5506 try those hosts that haven't been tried since the message arrived. */
5510 debug_printf("all IP addresses skipped or deferred at least one address\n");
5511 if (expired && !ob->delay_after_cutoff && cutoff_retry == 0)
5512 debug_printf("retrying IP addresses not tried since message arrived\n");
5517 /* Get here if all IP addresses are skipped or defer at least one address. In
5518 MUA wrapper mode, this will happen only for connection or other non-message-
5519 specific failures. Force the delivery status for all addresses to FAIL. */
5523 for (address_item * addr = addrlist; addr; addr = addr->next)
5524 addr->transport_return = FAIL;
5528 /* In the normal, non-wrapper case, add a standard message to each deferred
5529 address if there hasn't been an error, that is, if it hasn't actually been
5530 tried this time. The variable "expired" will be FALSE if any deliveries were
5531 actually tried, or if there was at least one host that was not expired. That
5532 is, it is TRUE only if no deliveries were tried and all hosts were expired. If
5533 a delivery has been tried, an error code will be set, and the failing of the
5534 message is handled by the retry code later.
5536 If queue_smtp is set, or this transport was called to send a subsequent message
5537 down an existing TCP/IP connection, and something caused the host not to be
5538 found, we end up here, but can detect these cases and handle them specially. */
5540 for (address_item * addr = addrlist; addr; addr = addr->next)
5542 /* If host is not NULL, it means that we stopped processing the host list
5543 because of hosts_max_try or hosts_max_try_hardlimit. In the former case, this
5544 means we need to behave as if some hosts were skipped because their retry
5545 time had not come. Specifically, this prevents the address from timing out.
5546 However, if we have hit hosts_max_try_hardlimit, we want to behave as if all
5547 hosts were tried. */
5550 if (total_hosts_tried >= ob->hosts_max_try_hardlimit)
5553 debug_printf("hosts_max_try_hardlimit reached: behave as if all "
5554 "hosts were tried\n");
5559 debug_printf("hosts_max_try limit caused some hosts to be skipped\n");
5560 setflag(addr, af_retry_skipped);
5563 if (f.queue_smtp) /* no deliveries attempted */
5565 addr->transport_return = DEFER;
5566 addr->basic_errno = 0;
5567 addr->message = US"SMTP delivery explicitly queued";
5570 else if ( addr->transport_return == DEFER
5571 && (addr->basic_errno == ERRNO_UNKNOWNERROR || addr->basic_errno == 0)
5575 addr->basic_errno = ERRNO_HRETRY;
5576 if (continue_hostname)
5577 addr->message = US"no host found for existing SMTP connection";
5580 setflag(addr, af_pass_message); /* This is not a security risk */
5581 addr->message = string_sprintf(
5582 "all hosts%s have been failing for a long time %s",
5583 addr->domain ? string_sprintf(" for '%s'", addr->domain) : US"",
5584 ob->delay_after_cutoff
5585 ? US"(and retry time not reached)"
5586 : US"and were last tried after this message arrived");
5588 /* If we are already using fallback hosts, or there are no fallback hosts
5589 defined, convert the result to FAIL to cause a bounce. */
5591 if (addr->host_list == addr->fallback_hosts || !addr->fallback_hosts)
5592 addr->transport_return = FAIL;
5597 if (hosts_retry == hosts_total)
5598 s = "retry time not reached for any host%s";
5599 else if (hosts_fail == hosts_total)
5600 s = "all host address lookups%s failed permanently";
5601 else if (hosts_defer == hosts_total)
5602 s = "all host address lookups%s failed temporarily";
5603 else if (hosts_serial == hosts_total)
5604 s = "connection limit reached for all hosts%s";
5605 else if (hosts_fail+hosts_defer == hosts_total)
5606 s = "all host address lookups%s failed";
5608 s = "some host address lookups failed and retry time "
5609 "not reached for other hosts or connection limit reached%s";
5611 addr->message = string_sprintf(s,
5612 addr->domain ? string_sprintf(" for '%s'", addr->domain) : US"");
5617 /* Update the database which keeps information about which messages are waiting
5618 for which hosts to become available. For some message-specific errors, the
5619 update_waiting flag is turned off because we don't want follow-on deliveries in
5620 those cases. If this transport instance is explicitly limited to one message
5621 per connection then follow-on deliveries are not possible and there's no need
5622 to create/update the per-transport wait-<transport_name> database. */
5624 if (update_waiting && tblock->connection_max_messages != 1)
5625 transport_update_waiting(hostlist, tblock->name);
5629 DEBUG(D_transport) debug_printf("Leaving %s transport\n", tblock->name);
5631 return TRUE; /* Each address has its status */
5634 #endif /*!MACRO_PREDEF*/
5637 /* End of transport/smtp.c */