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_alpn", opt_stringptr, LOFF(hosts_require_alpn) },
88 { "hosts_require_auth", opt_stringptr, LOFF(hosts_require_auth) },
91 { "hosts_require_dane", opt_stringptr, LOFF(hosts_require_dane) },
94 { "hosts_require_ocsp", opt_stringptr, LOFF(hosts_require_ocsp) },
96 { "hosts_require_tls", opt_stringptr, LOFF(hosts_require_tls) },
98 { "hosts_try_auth", opt_stringptr, LOFF(hosts_try_auth) },
99 { "hosts_try_chunking", opt_stringptr, LOFF(hosts_try_chunking) },
101 { "hosts_try_dane", opt_stringptr, LOFF(hosts_try_dane) },
103 { "hosts_try_fastopen", opt_stringptr, LOFF(hosts_try_fastopen) },
105 { "hosts_try_prdr", opt_stringptr, LOFF(hosts_try_prdr) },
108 { "hosts_verify_avoid_tls", opt_stringptr, LOFF(hosts_verify_avoid_tls) },
110 { "interface", opt_stringptr, LOFF(interface) },
111 { "keepalive", opt_bool, LOFF(keepalive) },
112 { "lmtp_ignore_quota", opt_bool, LOFF(lmtp_ignore_quota) },
113 { "max_rcpt", opt_int | opt_public,
114 OPT_OFF(transport_instance, max_addresses) },
115 { "message_linelength_limit", opt_int, LOFF(message_linelength_limit) },
116 { "multi_domain", opt_expand_bool | opt_public,
117 OPT_OFF(transport_instance, multi_domain) },
118 { "port", opt_stringptr, LOFF(port) },
119 { "protocol", opt_stringptr, LOFF(protocol) },
120 { "retry_include_ip_address", opt_expand_bool, LOFF(retry_include_ip_address) },
121 { "serialize_hosts", opt_stringptr, LOFF(serialize_hosts) },
122 { "size_addition", opt_int, LOFF(size_addition) },
124 { "socks_proxy", opt_stringptr, LOFF(socks_proxy) },
127 { "tls_alpn", opt_stringptr, LOFF(tls_alpn) },
128 { "tls_certificate", opt_stringptr, LOFF(tls_certificate) },
129 { "tls_crl", opt_stringptr, LOFF(tls_crl) },
130 { "tls_dh_min_bits", opt_int, LOFF(tls_dh_min_bits) },
131 { "tls_privatekey", opt_stringptr, LOFF(tls_privatekey) },
132 { "tls_require_ciphers", opt_stringptr, LOFF(tls_require_ciphers) },
133 # ifndef DISABLE_TLS_RESUME
134 { "tls_resumption_hosts", opt_stringptr, LOFF(tls_resumption_hosts) },
136 { "tls_sni", opt_stringptr, LOFF(tls_sni) },
137 { "tls_tempfail_tryclear", opt_bool, LOFF(tls_tempfail_tryclear) },
138 { "tls_try_verify_hosts", opt_stringptr, LOFF(tls_try_verify_hosts) },
139 { "tls_verify_cert_hostnames", opt_stringptr, LOFF(tls_verify_cert_hostnames)},
140 { "tls_verify_certificates", opt_stringptr, LOFF(tls_verify_certificates) },
141 { "tls_verify_hosts", opt_stringptr, LOFF(tls_verify_hosts) },
144 { "utf8_downconvert", opt_stringptr, LOFF(utf8_downconvert) },
148 /* Size of the options list. An extern variable has to be used so that its
149 address can appear in the tables drtables.c. */
151 int smtp_transport_options_count = nelem(smtp_transport_options);
157 smtp_transport_options_block smtp_transport_option_defaults = {0};
158 void smtp_transport_init(transport_instance *tblock) {}
159 BOOL smtp_transport_entry(transport_instance *tblock, address_item *addr) {return FALSE;}
160 void smtp_transport_closedown(transport_instance *tblock) {}
162 #else /*!MACRO_PREDEF*/
165 /* Default private options block for the smtp transport. */
167 smtp_transport_options_block smtp_transport_option_defaults = {
168 /* All non-mentioned elements 0/NULL/FALSE */
169 .helo_data = US"$primary_hostname",
170 .protocol = US"smtp",
171 .hosts_try_chunking = US"*",
173 .hosts_try_dane = US"*",
175 .hosts_try_fastopen = US"*",
177 .hosts_try_prdr = US"*",
180 .hosts_request_ocsp = US"*", /* hosts_request_ocsp (except under DANE; tls_client_start()) */
182 .command_timeout = 5*60,
183 .connect_timeout = 5*60,
184 .data_timeout = 5*60,
185 .final_timeout = 10*60,
186 .size_addition = 1024,
188 .hosts_max_try_hardlimit = 50,
189 .message_linelength_limit = 998,
190 .address_retry_include_sender = TRUE,
191 .dns_qualify_single = TRUE,
192 .dnssec = { .request= US"*", .require=NULL },
193 .delay_after_cutoff = TRUE,
195 .retry_include_ip_address = TRUE,
197 # if defined(SUPPORT_SYSDEFAULT_CABUNDLE) || !defined(USE_GNUTLS)
198 .tls_verify_certificates = US"system",
200 .tls_dh_min_bits = EXIM_CLIENT_DH_DEFAULT_MIN_BITS,
201 .tls_tempfail_tryclear = TRUE,
202 .tls_try_verify_hosts = US"*",
203 .tls_verify_cert_hostnames = US"*",
206 .utf8_downconvert = US"-1",
210 { .dkim_hash = US"sha256", },
214 /* some DSN flags for use later */
216 static int rf_list[] = {rf_notify_never, rf_notify_success,
217 rf_notify_failure, rf_notify_delay };
219 static uschar *rf_names[] = { US"NEVER", US"SUCCESS", US"FAILURE", US"DELAY" };
225 static uschar *smtp_command; /* Points to last cmd for error messages */
226 static uschar *mail_command; /* Points to MAIL cmd for error messages */
227 static uschar *data_command = US""; /* Points to DATA cmd for error messages */
228 static BOOL update_waiting; /* TRUE to update the "wait" database */
230 /*XXX move to smtp_context */
231 static BOOL pipelining_active; /* current transaction is in pipe mode */
234 static unsigned ehlo_response(uschar * buf, unsigned checks);
237 /******************************************************************************/
240 smtp_deliver_init(void)
242 if (!regex_PIPELINING) regex_PIPELINING =
243 regex_must_compile(US"\\n250[\\s\\-]PIPELINING(\\s|\\n|$)", FALSE, TRUE);
245 if (!regex_SIZE) regex_SIZE =
246 regex_must_compile(US"\\n250[\\s\\-]SIZE(\\s|\\n|$)", FALSE, TRUE);
248 if (!regex_AUTH) regex_AUTH =
249 regex_must_compile(AUTHS_REGEX, FALSE, TRUE);
252 if (!regex_STARTTLS) regex_STARTTLS =
253 regex_must_compile(US"\\n250[\\s\\-]STARTTLS(\\s|\\n|$)", FALSE, TRUE);
256 if (!regex_CHUNKING) regex_CHUNKING =
257 regex_must_compile(US"\\n250[\\s\\-]CHUNKING(\\s|\\n|$)", FALSE, TRUE);
260 if (!regex_PRDR) regex_PRDR =
261 regex_must_compile(US"\\n250[\\s\\-]PRDR(\\s|\\n|$)", FALSE, TRUE);
265 if (!regex_UTF8) regex_UTF8 =
266 regex_must_compile(US"\\n250[\\s\\-]SMTPUTF8(\\s|\\n|$)", FALSE, TRUE);
269 if (!regex_DSN) regex_DSN =
270 regex_must_compile(US"\\n250[\\s\\-]DSN(\\s|\\n|$)", FALSE, TRUE);
272 if (!regex_IGNOREQUOTA) regex_IGNOREQUOTA =
273 regex_must_compile(US"\\n250[\\s\\-]IGNOREQUOTA(\\s|\\n|$)", FALSE, TRUE);
275 #ifndef DISABLE_PIPE_CONNECT
276 if (!regex_EARLY_PIPE) regex_EARLY_PIPE =
277 regex_must_compile(US"\\n250[\\s\\-]" EARLY_PIPE_FEATURE_NAME "(\\s|\\n|$)", FALSE, TRUE);
280 #ifdef EXPERIMENTAL_ESMTP_LIMITS
281 if (!regex_LIMITS) regex_LIMITS =
282 regex_must_compile(US"\\n250[\\s\\-]LIMITS\\s", FALSE, TRUE);
287 /*************************************************
288 * Setup entry point *
289 *************************************************/
291 /* This function is called when the transport is about to be used,
292 but before running it in a sub-process. It is used for two things:
294 (1) To set the fallback host list in addresses, when delivering.
295 (2) To pass back the interface, port, protocol, and other options, for use
296 during callout verification.
299 tblock pointer to the transport instance block
300 addrlist list of addresses about to be transported
301 tf if not NULL, pointer to block in which to return options
302 uid the uid that will be set (not used)
303 gid the gid that will be set (not used)
304 errmsg place for error message (not used)
306 Returns: OK always (FAIL, DEFER not used)
310 smtp_transport_setup(transport_instance *tblock, address_item *addrlist,
311 transport_feedback *tf, uid_t uid, gid_t gid, uschar **errmsg)
313 smtp_transport_options_block *ob = SOB tblock->options_block;
315 /* Pass back options if required. This interface is getting very messy. */
319 tf->interface = ob->interface;
321 tf->protocol = ob->protocol;
322 tf->hosts = ob->hosts;
323 tf->hosts_override = ob->hosts_override;
324 tf->hosts_randomize = ob->hosts_randomize;
325 tf->gethostbyname = ob->gethostbyname;
326 tf->qualify_single = ob->dns_qualify_single;
327 tf->search_parents = ob->dns_search_parents;
328 tf->helo_data = ob->helo_data;
331 /* Set the fallback host list for all the addresses that don't have fallback
332 host lists, provided that the local host wasn't present in the original host
335 if (!testflag(addrlist, af_local_host_removed))
336 for (; addrlist; addrlist = addrlist->next)
337 if (!addrlist->fallback_hosts) addrlist->fallback_hosts = ob->fallback_hostlist;
344 /*************************************************
345 * Initialization entry point *
346 *************************************************/
348 /* Called for each instance, after its options have been read, to
349 enable consistency checks to be done, or anything else that needs
352 Argument: pointer to the transport instance block
357 smtp_transport_init(transport_instance *tblock)
359 smtp_transport_options_block *ob = SOB tblock->options_block;
360 int old_pool = store_pool;
362 /* Retry_use_local_part defaults FALSE if unset */
364 if (tblock->retry_use_local_part == TRUE_UNSET)
365 tblock->retry_use_local_part = FALSE;
367 /* Set the default port according to the protocol */
370 ob->port = strcmpic(ob->protocol, US"lmtp") == 0
372 : strcmpic(ob->protocol, US"smtps") == 0
373 ? US"smtps" : US"smtp";
375 /* Set up the setup entry point, to be called before subprocesses for this
378 tblock->setup = smtp_transport_setup;
380 /* Complain if any of the timeouts are zero. */
382 if (ob->command_timeout <= 0 || ob->data_timeout <= 0 ||
383 ob->final_timeout <= 0)
384 log_write(0, LOG_PANIC_DIE|LOG_CONFIG,
385 "command, data, or final timeout value is zero for %s transport",
388 /* If hosts_override is set and there are local hosts, set the global
389 flag that stops verify from showing router hosts. */
391 if (ob->hosts_override && ob->hosts) tblock->overrides_hosts = TRUE;
393 /* If there are any fallback hosts listed, build a chain of host items
394 for them, but do not do any lookups at this time. */
396 store_pool = POOL_PERM;
397 host_build_hostlist(&ob->fallback_hostlist, ob->fallback_hosts, FALSE);
398 store_pool = old_pool;
405 /*************************************************
406 * Set delivery info into all active addresses *
407 *************************************************/
409 /* Only addresses whose status is >= PENDING are relevant. A lesser
410 status means that an address is not currently being processed.
413 addrlist points to a chain of addresses
414 errno_value to put in each address's errno field
415 msg to put in each address's message field
416 rc to put in each address's transport_return field
417 pass_message if TRUE, set the "pass message" flag in the address
418 host if set, mark addrs as having used this host
419 smtp_greeting from peer
420 helo_response from peer
421 start points to timestamp of delivery start
423 If errno_value has the special value ERRNO_CONNECTTIMEOUT, ETIMEDOUT is put in
424 the errno field, and RTEF_CTOUT is ORed into the more_errno field, to indicate
425 this particular type of timeout.
431 set_errno(address_item *addrlist, int errno_value, uschar *msg, int rc,
432 BOOL pass_message, host_item * host,
433 #ifdef EXPERIMENTAL_DSN_INFO
434 const uschar * smtp_greeting, const uschar * helo_response,
436 struct timeval * start
440 struct timeval deliver_time;
442 if (errno_value == ERRNO_CONNECTTIMEOUT)
444 errno_value = ETIMEDOUT;
445 orvalue = RTEF_CTOUT;
447 timesince(&deliver_time, start);
449 for (address_item * addr = addrlist; addr; addr = addr->next)
450 if (addr->transport_return >= PENDING)
452 addr->basic_errno = errno_value;
453 addr->more_errno |= orvalue;
454 addr->delivery_time = deliver_time;
458 if (pass_message) setflag(addr, af_pass_message);
460 addr->transport_return = rc;
463 addr->host_used = host;
464 #ifdef EXPERIMENTAL_DSN_INFO
466 {uschar * s = Ustrchr(smtp_greeting, '\n'); if (s) *s = '\0';}
467 addr->smtp_greeting = smtp_greeting;
470 {uschar * s = Ustrchr(helo_response, '\n'); if (s) *s = '\0';}
471 addr->helo_response = helo_response;
478 set_errno_nohost(address_item * addrlist, int errno_value, uschar * msg, int rc,
479 BOOL pass_message, struct timeval * start)
481 set_errno(addrlist, errno_value, msg, rc, pass_message, NULL,
482 #ifdef EXPERIMENTAL_DSN_INFO
489 /*************************************************
490 * Check an SMTP response *
491 *************************************************/
493 /* This function is given an errno code and the SMTP response buffer
494 to analyse, together with the host identification for generating messages. It
495 sets an appropriate message and puts the first digit of the response code into
496 the yield variable. If no response was actually read, a suitable digit is
500 host the current host, to get its name for messages
501 errno_value pointer to the errno value
502 more_errno from the top address for use with ERRNO_FILTER_FAIL
503 buffer the SMTP response buffer
504 yield where to put a one-digit SMTP response code
505 message where to put an error message
506 pass_message set TRUE if message is an SMTP response
508 Returns: TRUE if an SMTP "QUIT" command should be sent, else FALSE
512 check_response(host_item *host, int *errno_value, int more_errno,
513 uschar *buffer, int *yield, uschar **message, BOOL *pass_message)
515 uschar * pl = pipelining_active ? US"pipelined " : US"";
518 *yield = '4'; /* Default setting is to give a temporary error */
522 case ETIMEDOUT: /* Handle response timeout */
523 *message = US string_sprintf("SMTP timeout after %s%s",
525 if (transport_count > 0)
526 *message = US string_sprintf("%s (%d bytes written)", *message,
530 case ERRNO_SMTPFORMAT: /* Handle malformed SMTP response */
531 s = string_printing(buffer);
532 while (isspace(*s)) s++;
534 ? string_sprintf("Malformed SMTP reply (an empty line) "
535 "in response to %s%s", pl, smtp_command)
536 : string_sprintf("Malformed SMTP reply in response to %s%s: %s",
537 pl, smtp_command, s);
540 case ERRNO_TLSFAILURE: /* Handle bad first read; can happen with
542 *message = US"bad first read from TLS conn";
545 case ERRNO_FILTER_FAIL: /* Handle a failed filter process error;
546 can't send QUIT as we mustn't end the DATA. */
547 *message = string_sprintf("transport filter process failed (%d)%s",
549 more_errno == EX_EXECFAILED ? ": unable to execute command" : "");
552 case ERRNO_CHHEADER_FAIL: /* Handle a failed add_headers expansion;
553 can't send QUIT as we mustn't end the DATA. */
555 string_sprintf("failed to expand headers_add or headers_remove: %s",
556 expand_string_message);
559 case ERRNO_WRITEINCOMPLETE: /* failure to write a complete data block */
560 *message = US"failed to write a data block";
564 case ERRNO_UTF8_FWD: /* no advertised SMTPUTF8, for international message */
565 *message = US"utf8 support required but not offered for forwarding";
566 DEBUG(D_deliver|D_transport) debug_printf("%s\n", *message);
571 /* Handle error responses from the remote mailer. */
575 *message = string_sprintf("SMTP error from remote mail server after %s%s: "
576 "%s", pl, smtp_command, s = string_printing(buffer));
577 *pass_message = TRUE;
582 /* No data was read. If there is no errno, this must be the EOF (i.e.
583 connection closed) case, which causes deferral. An explicit connection reset
584 error has the same effect. Otherwise, put the host's identity in the message,
585 leaving the errno value to be interpreted as well. In all cases, we have to
586 assume the connection is now dead. */
588 if (*errno_value == 0 || *errno_value == ECONNRESET)
590 *errno_value = ERRNO_SMTPCLOSED;
591 *message = US string_sprintf("Remote host closed connection "
592 "in response to %s%s", pl, smtp_command);
595 *message = US string_sprintf("%s [%s]", host->name, host->address);
602 /*************************************************
603 * Write error message to logs *
604 *************************************************/
606 /* This writes to the main log and to the message log.
609 host the current host
610 detail the current message (addr_item->message)
611 basic_errno the errno (addr_item->basic_errno)
617 write_logs(const host_item *host, const uschar *suffix, int basic_errno)
619 gstring * message = LOGGING(outgoing_port)
620 ? string_fmt_append(NULL, "H=%s [%s]:%d", host->name, host->address,
621 host->port == PORT_NONE ? 25 : host->port)
622 : string_fmt_append(NULL, "H=%s [%s]", host->name, host->address);
626 message = string_fmt_append(message, ": %s", suffix);
628 message = string_fmt_append(message, ": %s", strerror(basic_errno));
631 message = string_fmt_append(message, " %s", exim_errstr(basic_errno));
633 log_write(0, LOG_MAIN, "%s", string_from_gstring(message));
634 deliver_msglog("%s %s\n", tod_stamp(tod_log), message->s);
638 msglog_line(host_item * host, uschar * message)
640 deliver_msglog("%s H=%s [%s] %s\n", tod_stamp(tod_log),
641 host->name, host->address, message);
646 #ifndef DISABLE_EVENT
647 /*************************************************
648 * Post-defer action *
649 *************************************************/
651 /* This expands an arbitrary per-transport string.
652 It might, for example, be used to write to the database log.
655 addr the address item containing error information
656 host the current host
663 deferred_event_raise(address_item * addr, host_item * host, uschar * evstr)
665 uschar * action = addr->transport->event_action;
666 const uschar * save_domain;
672 save_domain = deliver_domain;
673 save_local = deliver_localpart;
675 /*XXX would ip & port already be set up? */
676 deliver_host_address = string_copy(host->address);
677 deliver_host_port = host->port == PORT_NONE ? 25 : host->port;
678 event_defer_errno = addr->basic_errno;
680 router_name = addr->router->name;
681 transport_name = addr->transport->name;
682 deliver_domain = addr->domain;
683 deliver_localpart = addr->local_part;
685 (void) event_raise(action, evstr,
687 ? addr->basic_errno > 0
688 ? string_sprintf("%s: %s", addr->message, strerror(addr->basic_errno))
689 : string_copy(addr->message)
690 : addr->basic_errno > 0
691 ? string_copy(US strerror(addr->basic_errno))
694 deliver_localpart = save_local;
695 deliver_domain = save_domain;
696 router_name = transport_name = NULL;
700 /*************************************************
701 * Reap SMTP specific responses *
702 *************************************************/
704 smtp_discard_responses(smtp_context * sx, smtp_transport_options_block * ob,
707 uschar flushbuffer[4096];
711 if (!smtp_read_response(sx, flushbuffer, sizeof(flushbuffer),
712 '2', ob->command_timeout)
713 && (errno != 0 || flushbuffer[0] == 0))
720 /* Return boolean success */
723 smtp_reap_banner(smtp_context * sx)
726 #if defined(__linux__) && defined(TCP_QUICKACK)
727 { /* Hack to get QUICKACK disabled; has to be right after 3whs, and has to on->off */
728 int sock = sx->cctx.sock;
729 struct pollfd p = {.fd = sock, .events = POLLOUT};
730 int rc = poll(&p, 1, 1000);
731 (void) setsockopt(sock, IPPROTO_TCP, TCP_QUICKACK, US &on, sizeof(on));
732 (void) setsockopt(sock, IPPROTO_TCP, TCP_QUICKACK, US &off, sizeof(off));
735 good_response = smtp_read_response(sx, sx->buffer, sizeof(sx->buffer),
736 '2', (SOB sx->conn_args.ob)->command_timeout);
737 #ifdef EXPERIMENTAL_DSN_INFO
738 sx->smtp_greeting = string_copy(sx->buffer);
740 return good_response;
744 smtp_reap_ehlo(smtp_context * sx)
746 if (!smtp_read_response(sx, sx->buffer, sizeof(sx->buffer), '2',
747 (SOB sx->conn_args.ob)->command_timeout))
749 if (errno != 0 || sx->buffer[0] == 0 || sx->lmtp)
751 #ifdef EXPERIMENTAL_DSN_INFO
752 sx->helo_response = string_copy(sx->buffer);
758 #ifdef EXPERIMENTAL_DSN_INFO
759 sx->helo_response = string_copy(sx->buffer);
761 #ifndef DISABLE_EVENT
762 (void) event_raise(sx->conn_args.tblock->event_action,
763 US"smtp:ehlo", sx->buffer);
769 /******************************************************************************/
771 #ifdef EXPERIMENTAL_ESMTP_LIMITS
772 /* If TLS, or TLS not offered, called with the EHLO response in the buffer.
773 Check it for a LIMITS keyword and parse values into the smtp context structure.
775 We don't bother with peers that we won't talk TLS to, even though they can,
776 just ignore their LIMITS advice (if any) and treat them as if they do not.
777 This saves us dealing with a duplicate set of values. */
780 ehlo_response_limits_read(smtp_context * sx)
782 int ovec[3]; /* results vector for a main-match only */
784 /* matches up to just after the first space after the keyword */
786 if (pcre_exec(regex_LIMITS, NULL, CS sx->buffer, Ustrlen(sx->buffer),
787 0, PCRE_EOPT, ovec, nelem(ovec)) >= 0)
788 for (const uschar * s = sx->buffer + ovec[1]; *s; )
790 while (isspace(*s)) s++;
791 if (*s == '\n') break;
793 if (strncmpic(s, US"MAILMAX=", 8) == 0)
795 sx->peer_limit_mail = atoi(CS (s += 8));
796 while (isdigit(*s)) s++;
798 else if (strncmpic(s, US"RCPTMAX=", 8) == 0)
800 sx->peer_limit_rcpt = atoi(CS (s += 8));
801 while (isdigit(*s)) s++;
803 else if (strncmpic(s, US"RCPTDOMAINMAX=", 14) == 0)
805 sx->peer_limit_rcptdom = atoi(CS (s += 14));
806 while (isdigit(*s)) s++;
809 while (*s && !isspace(*s)) s++;
813 /* Apply given values to the current connection */
815 ehlo_limits_apply(smtp_context * sx,
816 unsigned limit_mail, unsigned limit_rcpt, unsigned limit_rcptdom)
818 if (limit_mail && limit_mail < sx->max_mail) sx->max_mail = limit_mail;
819 if (limit_rcpt && limit_rcpt < sx->max_rcpt) sx->max_rcpt = limit_rcpt;
822 DEBUG(D_transport) debug_printf("will treat as !multi_domain\n");
823 sx->single_rcpt_domain = TRUE;
827 /* Apply values from EHLO-resp to the current connection */
829 ehlo_response_limits_apply(smtp_context * sx)
831 ehlo_limits_apply(sx, sx->peer_limit_mail, sx->peer_limit_rcpt,
832 sx->peer_limit_rcptdom);
835 /* Apply values read from cache to the current connection */
837 ehlo_cache_limits_apply(smtp_context * sx)
839 ehlo_limits_apply(sx, sx->ehlo_resp.limit_mail, sx->ehlo_resp.limit_rcpt,
840 sx->ehlo_resp.limit_rcptdom);
844 /******************************************************************************/
846 #ifndef DISABLE_PIPE_CONNECT
848 ehlo_cache_key(const smtp_context * sx)
850 host_item * host = sx->conn_args.host;
851 return Ustrchr(host->address, ':')
852 ? string_sprintf("[%s]:%d.EHLO", host->address,
853 host->port == PORT_NONE ? sx->port : host->port)
854 : string_sprintf("%s:%d.EHLO", host->address,
855 host->port == PORT_NONE ? sx->port : host->port);
858 /* Cache EHLO-response info for use by early-pipe.
860 - During a normal flow on EHLO response (either cleartext or under TLS),
861 when we are willing to do PIPE_CONNECT and it is offered
862 - During an early-pipe flow on receiving the actual EHLO response and noting
863 disparity versus the cached info used, when PIPE_CONNECT is still being offered
865 We assume that suitable values have been set in the sx.ehlo_resp structure for
866 features and auths; we handle the copy of limits. */
869 write_ehlo_cache_entry(smtp_context * sx)
871 open_db dbblock, * dbm_file;
873 #ifdef EXPERIMENTAL_ESMTP_LIMITS
874 sx->ehlo_resp.limit_mail = sx->peer_limit_mail;
875 sx->ehlo_resp.limit_rcpt = sx->peer_limit_rcpt;
876 sx->ehlo_resp.limit_rcptdom = sx->peer_limit_rcptdom;
879 if ((dbm_file = dbfn_open(US"misc", O_RDWR, &dbblock, TRUE, TRUE)))
881 uschar * ehlo_resp_key = ehlo_cache_key(sx);
882 dbdata_ehlo_resp er = { .data = sx->ehlo_resp };
885 #ifdef EXPERIMENTAL_ESMTP_LIMITS
886 if (sx->ehlo_resp.limit_mail || sx->ehlo_resp.limit_rcpt || sx->ehlo_resp.limit_rcptdom)
887 debug_printf("writing clr %04x/%04x cry %04x/%04x lim %05d/%05d/%05d\n",
888 sx->ehlo_resp.cleartext_features, sx->ehlo_resp.cleartext_auths,
889 sx->ehlo_resp.crypted_features, sx->ehlo_resp.crypted_auths,
890 sx->ehlo_resp.limit_mail, sx->ehlo_resp.limit_rcpt,
891 sx->ehlo_resp.limit_rcptdom);
894 debug_printf("writing clr %04x/%04x cry %04x/%04x\n",
895 sx->ehlo_resp.cleartext_features, sx->ehlo_resp.cleartext_auths,
896 sx->ehlo_resp.crypted_features, sx->ehlo_resp.crypted_auths);
898 dbfn_write(dbm_file, ehlo_resp_key, &er, (int)sizeof(er));
899 dbfn_close(dbm_file);
904 invalidate_ehlo_cache_entry(smtp_context * sx)
906 open_db dbblock, * dbm_file;
908 if ( sx->early_pipe_active
909 && (dbm_file = dbfn_open(US"misc", O_RDWR, &dbblock, TRUE, TRUE)))
911 uschar * ehlo_resp_key = ehlo_cache_key(sx);
912 dbfn_delete(dbm_file, ehlo_resp_key);
913 dbfn_close(dbm_file);
918 read_ehlo_cache_entry(smtp_context * sx)
923 if (!(dbm_file = dbfn_open(US"misc", O_RDONLY, &dbblock, FALSE, TRUE)))
924 { DEBUG(D_transport) debug_printf("ehlo-cache: no misc DB\n"); }
927 uschar * ehlo_resp_key = ehlo_cache_key(sx);
928 dbdata_ehlo_resp * er;
930 if (!(er = dbfn_read_enforce_length(dbm_file, ehlo_resp_key, sizeof(dbdata_ehlo_resp))))
931 { DEBUG(D_transport) debug_printf("no ehlo-resp record\n"); }
932 else if (time(NULL) - er->time_stamp > retry_data_expire)
934 DEBUG(D_transport) debug_printf("ehlo-resp record too old\n");
935 dbfn_close(dbm_file);
936 if ((dbm_file = dbfn_open(US"misc", O_RDWR, &dbblock, TRUE, TRUE)))
937 dbfn_delete(dbm_file, ehlo_resp_key);
942 #ifdef EXPERIMENTAL_ESMTP_LIMITS
943 if (er->data.limit_mail || er->data.limit_rcpt || er->data.limit_rcptdom)
944 debug_printf("EHLO response bits from cache:"
945 " cleartext 0x%04x/0x%04x crypted 0x%04x/0x%04x lim %05d/%05d/%05d\n",
946 er->data.cleartext_features, er->data.cleartext_auths,
947 er->data.crypted_features, er->data.crypted_auths,
948 er->data.limit_mail, er->data.limit_rcpt, er->data.limit_rcptdom);
951 debug_printf("EHLO response bits from cache:"
952 " cleartext 0x%04x/0x%04x crypted 0x%04x/0x%04x\n",
953 er->data.cleartext_features, er->data.cleartext_auths,
954 er->data.crypted_features, er->data.crypted_auths);
956 sx->ehlo_resp = er->data;
957 #ifdef EXPERIMENTAL_ESMTP_LIMITS
958 ehlo_cache_limits_apply(sx);
960 dbfn_close(dbm_file);
963 dbfn_close(dbm_file);
970 /* Return an auths bitmap for the set of AUTH methods offered by the server
971 which match our authenticators. */
973 static unsigned short
974 study_ehlo_auths(smtp_context * sx)
979 unsigned short authbits = 0;
981 if (!sx->esmtp) return 0;
982 if (!regex_AUTH) regex_AUTH = regex_must_compile(AUTHS_REGEX, FALSE, TRUE);
983 if (!regex_match_and_setup(regex_AUTH, sx->buffer, 0, -1)) return 0;
984 expand_nmax = -1; /* reset */
985 names = string_copyn(expand_nstring[1], expand_nlength[1]);
987 for (au = auths, authnum = 0; au; au = au->next, authnum++) if (au->client)
989 const uschar * list = names;
991 for (int sep = ' '; s = string_nextinlist(&list, &sep, NULL, 0); )
992 if (strcmpic(au->public_name, s) == 0)
993 { authbits |= BIT(authnum); break; }
997 debug_printf("server offers %s AUTH, methods '%s', bitmap 0x%04x\n",
998 tls_out.active.sock >= 0 ? "crypted" : "plaintext", names, authbits);
1000 if (tls_out.active.sock >= 0)
1001 sx->ehlo_resp.crypted_auths = authbits;
1003 sx->ehlo_resp.cleartext_auths = authbits;
1010 /* Wait for and check responses for early-pipelining.
1012 Called from the lower-level smtp_read_response() function
1013 used for general code that assume synchronisation, if context
1014 flags indicate outstanding early-pipelining commands. Also
1015 called fom sync_responses() which handles pipelined commands.
1018 sx smtp connection context
1019 countp number of outstanding responses, adjusted on return
1023 DEFER error on first read of TLS'd conn
1024 FAIL SMTP error in response
1027 smtp_reap_early_pipe(smtp_context * sx, int * countp)
1029 BOOL pending_BANNER = sx->pending_BANNER;
1030 BOOL pending_EHLO = sx->pending_EHLO;
1033 sx->pending_BANNER = FALSE; /* clear early to avoid recursion */
1034 sx->pending_EHLO = FALSE;
1038 DEBUG(D_transport) debug_printf("%s expect banner\n", __FUNCTION__);
1040 if (!smtp_reap_banner(sx))
1042 DEBUG(D_transport) debug_printf("bad banner\n");
1043 if (tls_out.active.sock >= 0) rc = DEFER;
1050 unsigned peer_offered;
1051 unsigned short authbits = 0, * ap;
1053 DEBUG(D_transport) debug_printf("%s expect ehlo\n", __FUNCTION__);
1055 if (!smtp_reap_ehlo(sx))
1057 DEBUG(D_transport) debug_printf("bad response for EHLO\n");
1058 if (tls_out.active.sock >= 0) rc = DEFER;
1062 /* Compare the actual EHLO response extensions and AUTH methods to the cached
1063 value we assumed; on difference, dump or rewrite the cache and arrange for a
1066 ap = tls_out.active.sock < 0
1067 ? &sx->ehlo_resp.cleartext_auths : &sx->ehlo_resp.crypted_auths;
1069 peer_offered = ehlo_response(sx->buffer,
1070 (tls_out.active.sock < 0 ? OPTION_TLS : 0)
1071 | OPTION_CHUNKING | OPTION_PRDR | OPTION_DSN | OPTION_PIPE | OPTION_SIZE
1072 | OPTION_UTF8 | OPTION_EARLY_PIPE
1074 #ifdef EXPERIMENTAL_ESMTP_LIMITS
1075 if (tls_out.active.sock >= 0 || !(peer_offered & OPTION_TLS))
1076 ehlo_response_limits_read(sx);
1078 if ( peer_offered != sx->peer_offered
1079 || (authbits = study_ehlo_auths(sx)) != *ap)
1082 debug_printf("EHLO %s extensions changed, 0x%04x/0x%04x -> 0x%04x/0x%04x\n",
1083 tls_out.active.sock < 0 ? "cleartext" : "crypted",
1084 sx->peer_offered, *ap, peer_offered, authbits);
1085 if (peer_offered & OPTION_EARLY_PIPE)
1087 *(tls_out.active.sock < 0
1088 ? &sx->ehlo_resp.cleartext_features : &sx->ehlo_resp.crypted_features) =
1091 write_ehlo_cache_entry(sx);
1094 invalidate_ehlo_cache_entry(sx);
1096 return OK; /* just carry on */
1098 #ifdef EXPERIMENTAL_ESMTP_LIMITS
1099 /* If we are handling LIMITS, compare the actual EHLO LIMITS values with the
1100 cached values and invalidate cache if different. OK to carry on with
1101 connect since values are advisory. */
1103 if ( (tls_out.active.sock >= 0 || !(peer_offered & OPTION_TLS))
1104 && ( sx->peer_limit_mail != sx->ehlo_resp.limit_mail
1105 || sx->peer_limit_rcpt != sx->ehlo_resp.limit_rcpt
1106 || sx->peer_limit_rcptdom != sx->ehlo_resp.limit_rcptdom
1111 debug_printf("EHLO LIMITS changed:");
1112 if (sx->peer_limit_mail != sx->ehlo_resp.limit_mail)
1113 debug_printf(" MAILMAX %u -> %u\n", sx->ehlo_resp.limit_mail, sx->peer_limit_mail);
1114 else if (sx->peer_limit_rcpt != sx->ehlo_resp.limit_rcpt)
1115 debug_printf(" RCPTMAX %u -> %u\n", sx->ehlo_resp.limit_rcpt, sx->peer_limit_rcpt);
1117 debug_printf(" RCPTDOMAINMAX %u -> %u\n", sx->ehlo_resp.limit_rcptdom, sx->peer_limit_rcptdom);
1119 invalidate_ehlo_cache_entry(sx);
1127 invalidate_ehlo_cache_entry(sx);
1128 (void) smtp_discard_responses(sx, sx->conn_args.ob, *countp);
1131 #endif /*!DISABLE_PIPE_CONNECT*/
1134 /*************************************************
1135 * Synchronize SMTP responses *
1136 *************************************************/
1138 /* This function is called from smtp_deliver() to receive SMTP responses from
1139 the server, and match them up with the commands to which they relate. When
1140 PIPELINING is not in use, this function is called after every command, and is
1141 therefore somewhat over-engineered, but it is simpler to use a single scheme
1142 that works both with and without PIPELINING instead of having two separate sets
1145 The set of commands that are buffered up with pipelining may start with MAIL
1146 and may end with DATA; in between are RCPT commands that correspond to the
1147 addresses whose status is PENDING_DEFER. All other commands (STARTTLS, AUTH,
1148 etc.) are never buffered.
1150 Errors after MAIL or DATA abort the whole process leaving the response in the
1151 buffer. After MAIL, pending responses are flushed, and the original command is
1152 re-instated in big_buffer for error messages. For RCPT commands, the remote is
1153 permitted to reject some recipient addresses while accepting others. However
1154 certain errors clearly abort the whole process. Set the value in
1155 transport_return to PENDING_OK if the address is accepted. If there is a
1156 subsequent general error, it will get reset accordingly. If not, it will get
1157 converted to OK at the end.
1160 sx smtp connection context
1161 count the number of responses to read
1162 pending_DATA 0 if last command sent was not DATA
1163 +1 if previously had a good recipient
1164 -1 if not previously had a good recipient
1166 Returns: 3 if at least one address had 2xx and one had 5xx
1167 2 if at least one address had 5xx but none had 2xx
1168 1 if at least one host had a 2xx response, but none had 5xx
1169 0 no address had 2xx or 5xx but no errors (all 4xx, or just DATA)
1170 -1 timeout while reading RCPT response
1171 -2 I/O or other non-response error for RCPT
1172 -3 DATA or MAIL failed - errno and buffer set
1173 -4 banner or EHLO failed (early-pipelining)
1174 -5 banner or EHLO failed (early-pipelining, TLS)
1178 sync_responses(smtp_context * sx, int count, int pending_DATA)
1180 address_item * addr = sx->sync_addr;
1181 smtp_transport_options_block * ob = sx->conn_args.ob;
1184 #ifndef DISABLE_PIPE_CONNECT
1186 if ((rc = smtp_reap_early_pipe(sx, &count)) != OK)
1187 return rc == FAIL ? -4 : -5;
1190 /* Handle the response for a MAIL command. On error, reinstate the original
1191 command in big_buffer for error message use, and flush any further pending
1192 responses before returning, except after I/O errors and timeouts. */
1194 if (sx->pending_MAIL)
1196 DEBUG(D_transport) debug_printf("%s expect mail\n", __FUNCTION__);
1198 sx->pending_MAIL = sx->RCPT_452 = FALSE;
1199 if (!smtp_read_response(sx, sx->buffer, sizeof(sx->buffer),
1200 '2', ob->command_timeout))
1202 DEBUG(D_transport) debug_printf("bad response for MAIL\n");
1203 Ustrcpy(big_buffer, mail_command); /* Fits, because it came from there! */
1204 if (errno == ERRNO_TLSFAILURE)
1206 if (errno == 0 && sx->buffer[0] != 0)
1209 if (sx->buffer[0] == '4')
1211 save_errno = ERRNO_MAIL4XX;
1212 addr->more_errno |= ((sx->buffer[1] - '0')*10 + sx->buffer[2] - '0') << 8;
1214 count = smtp_discard_responses(sx, ob, count);
1218 if (pending_DATA) count--; /* Number of RCPT responses to come */
1219 while (count-- > 0) /* Mark any pending addrs with the host used */
1221 while (addr->transport_return != PENDING_DEFER) addr = addr->next;
1222 addr->host_used = sx->conn_args.host;
1229 if (pending_DATA) count--; /* Number of RCPT responses to come */
1231 /* Read and handle the required number of RCPT responses, matching each one up
1232 with an address by scanning for the next address whose status is PENDING_DEFER.
1237 while (addr->transport_return != PENDING_DEFER)
1238 if (!(addr = addr->next))
1241 /* The address was accepted */
1242 addr->host_used = sx->conn_args.host;
1244 DEBUG(D_transport) debug_printf("%s expect rcpt for %s\n", __FUNCTION__, addr->address);
1245 if (smtp_read_response(sx, sx->buffer, sizeof(sx->buffer),
1246 '2', ob->command_timeout))
1249 addr->transport_return = PENDING_OK;
1251 /* If af_dr_retry_exists is set, there was a routing delay on this address;
1252 ensure that any address-specific retry record is expunged. We do this both
1253 for the basic key and for the version that also includes the sender. */
1255 if (testflag(addr, af_dr_retry_exists))
1257 uschar *altkey = string_sprintf("%s:<%s>", addr->address_retry_key,
1259 retry_add_item(addr, altkey, rf_delete);
1260 retry_add_item(addr, addr->address_retry_key, rf_delete);
1264 /* Error on first TLS read */
1266 else if (errno == ERRNO_TLSFAILURE)
1269 /* Timeout while reading the response */
1271 else if (errno == ETIMEDOUT)
1273 uschar *message = string_sprintf("SMTP timeout after RCPT TO:<%s>",
1274 transport_rcpt_address(addr, sx->conn_args.tblock->rcpt_include_affixes));
1275 set_errno_nohost(sx->first_addr, ETIMEDOUT, message, DEFER, FALSE, &sx->delivery_start);
1276 retry_add_item(addr, addr->address_retry_key, 0);
1277 update_waiting = FALSE;
1281 /* Handle other errors in obtaining an SMTP response by returning -1. This
1282 will cause all the addresses to be deferred. Restore the SMTP command in
1283 big_buffer for which we are checking the response, so the error message
1286 else if (errno != 0 || sx->buffer[0] == 0)
1288 gstring gs = { .size = big_buffer_size, .ptr = 0, .s = big_buffer }, * g = &gs;
1290 /* Use taint-unchecked routines for writing into big_buffer, trusting
1291 that we'll never expand it. */
1293 g = string_fmt_append_f(g, SVFMT_TAINT_NOCHK, "RCPT TO:<%s>",
1294 transport_rcpt_address(addr, sx->conn_args.tblock->rcpt_include_affixes));
1295 string_from_gstring(g);
1299 /* Handle SMTP permanent and temporary response codes. */
1304 string_sprintf("SMTP error from remote mail server after RCPT TO:<%s>: "
1305 "%s", transport_rcpt_address(addr, sx->conn_args.tblock->rcpt_include_affixes),
1306 string_printing(sx->buffer));
1307 setflag(addr, af_pass_message);
1309 msglog_line(sx->conn_args.host, addr->message);
1311 /* The response was 5xx */
1313 if (sx->buffer[0] == '5')
1315 addr->transport_return = FAIL;
1319 /* The response was 4xx */
1323 addr->transport_return = DEFER;
1324 addr->basic_errno = ERRNO_RCPT4XX;
1325 addr->more_errno |= ((sx->buffer[1] - '0')*10 + sx->buffer[2] - '0') << 8;
1329 #ifndef DISABLE_EVENT
1330 event_defer_errno = addr->more_errno;
1331 msg_event_raise(US"msg:rcpt:host:defer", addr);
1333 /* If a 452 and we've had at least one 2xx or 5xx, set next_addr to the
1334 start point for another MAIL command. */
1336 if (addr->more_errno >> 8 == 52 && yield & 3)
1338 if (!sx->RCPT_452) /* initialised at MAIL-ack above */
1341 debug_printf("%s: seen first 452 too-many-rcpts\n", __FUNCTION__);
1342 sx->RCPT_452 = TRUE;
1343 sx->next_addr = addr;
1345 addr->transport_return = PENDING_DEFER;
1346 addr->basic_errno = 0;
1350 /* Log temporary errors if there are more hosts to be tried.
1351 If not, log this last one in the == line. */
1353 if (sx->conn_args.host->next)
1354 if (LOGGING(outgoing_port))
1355 log_write(0, LOG_MAIN, "H=%s [%s]:%d %s", sx->conn_args.host->name,
1356 sx->conn_args.host->address,
1357 sx->port == PORT_NONE ? 25 : sx->port, addr->message);
1359 log_write(0, LOG_MAIN, "H=%s [%s]: %s", sx->conn_args.host->name,
1360 sx->conn_args.host->address, addr->message);
1362 #ifndef DISABLE_EVENT
1364 msg_event_raise(US"msg:rcpt:defer", addr);
1367 /* Do not put this message on the list of those waiting for specific
1368 hosts, as otherwise it is likely to be tried too often. */
1370 update_waiting = FALSE;
1372 /* Add a retry item for the address so that it doesn't get tried again
1373 too soon. If address_retry_include_sender is true, add the sender address
1374 to the retry key. */
1376 retry_add_item(addr,
1377 ob->address_retry_include_sender
1378 ? string_sprintf("%s:<%s>", addr->address_retry_key, sender_address)
1379 : addr->address_retry_key,
1385 if (count && !(addr = addr->next))
1387 } /* Loop for next RCPT response */
1389 /* Update where to start at for the next block of responses, unless we
1390 have already handled all the addresses. */
1392 if (addr) sx->sync_addr = addr->next;
1394 /* Handle a response to DATA. If we have not had any good recipients, either
1395 previously or in this block, the response is ignored. */
1397 if (pending_DATA != 0)
1399 DEBUG(D_transport) debug_printf("%s expect data\n", __FUNCTION__);
1400 if (!smtp_read_response(sx, sx->buffer, sizeof(sx->buffer),
1401 '3', ob->command_timeout))
1407 if (errno == ERRNO_TLSFAILURE) /* Error on first TLS read */
1410 if (pending_DATA > 0 || (yield & 1) != 0)
1412 if (errno == 0 && sx->buffer[0] == '4')
1414 errno = ERRNO_DATA4XX;
1415 sx->first_addr->more_errno |= ((sx->buffer[1] - '0')*10 + sx->buffer[2] - '0') << 8;
1419 (void)check_response(sx->conn_args.host, &errno, 0, sx->buffer, &code, &msg, &pass_message);
1420 DEBUG(D_transport) debug_printf("%s\nerror for DATA ignored: pipelining "
1421 "is in use and there were no good recipients\n", msg);
1425 /* All responses read and handled; MAIL (if present) received 2xx and DATA (if
1426 present) received 3xx. If any RCPTs were handled and yielded anything other
1427 than 4xx, yield will be set non-zero. */
1436 /* Try an authenticator's client entry */
1439 try_authenticator(smtp_context * sx, auth_instance * au)
1441 smtp_transport_options_block * ob = sx->conn_args.ob; /* transport options */
1442 host_item * host = sx->conn_args.host; /* host to deliver to */
1445 sx->outblock.authenticating = TRUE;
1446 rc = (au->info->clientcode)(au, sx, ob->command_timeout,
1447 sx->buffer, sizeof(sx->buffer));
1448 sx->outblock.authenticating = FALSE;
1449 DEBUG(D_transport) debug_printf("%s authenticator yielded %d\n", au->name, rc);
1451 /* A temporary authentication failure must hold up delivery to
1452 this host. After a permanent authentication failure, we carry on
1453 to try other authentication methods. If all fail hard, try to
1454 deliver the message unauthenticated unless require_auth was set. */
1459 f.smtp_authenticated = TRUE; /* stops the outer loop */
1460 client_authenticator = au->name;
1461 if (au->set_client_id)
1462 client_authenticated_id = expand_string(au->set_client_id);
1465 /* Failure after writing a command */
1470 /* Failure after reading a response */
1473 if (errno != 0 || sx->buffer[0] != '5') return FAIL;
1474 log_write(0, LOG_MAIN, "%s authenticator failed H=%s [%s] %s",
1475 au->name, host->name, host->address, sx->buffer);
1478 /* Failure by some other means. In effect, the authenticator
1479 decided it wasn't prepared to handle this case. Typically this
1480 is the result of "fail" in an expansion string. Do we need to
1481 log anything here? Feb 2006: a message is now put in the buffer
1482 if logging is required. */
1485 if (*sx->buffer != 0)
1486 log_write(0, LOG_MAIN, "%s authenticator cancelled "
1487 "authentication H=%s [%s] %s", au->name, host->name,
1488 host->address, sx->buffer);
1491 /* Internal problem, message in buffer. */
1494 set_errno_nohost(sx->addrlist, ERRNO_AUTHPROB, string_copy(sx->buffer),
1495 DEFER, FALSE, &sx->delivery_start);
1504 /* Do the client side of smtp-level authentication.
1507 sx smtp connection context
1509 sx->buffer should have the EHLO response from server (gets overwritten)
1512 OK Success, or failed (but not required): global "smtp_authenticated" set
1513 DEFER Failed authentication (and was required)
1514 ERROR Internal problem
1516 FAIL_SEND Failed communications - transmit
1521 smtp_auth(smtp_context * sx)
1523 host_item * host = sx->conn_args.host; /* host to deliver to */
1524 smtp_transport_options_block * ob = sx->conn_args.ob; /* transport options */
1525 int require_auth = verify_check_given_host(CUSS &ob->hosts_require_auth, host);
1526 #ifndef DISABLE_PIPE_CONNECT
1527 unsigned short authbits = tls_out.active.sock >= 0
1528 ? sx->ehlo_resp.crypted_auths : sx->ehlo_resp.cleartext_auths;
1530 uschar * fail_reason = US"server did not advertise AUTH support";
1532 f.smtp_authenticated = FALSE;
1533 client_authenticator = client_authenticated_id = client_authenticated_sender = NULL;
1536 regex_AUTH = regex_must_compile(AUTHS_REGEX, FALSE, TRUE);
1538 /* Is the server offering AUTH? */
1542 #ifndef DISABLE_PIPE_CONNECT
1543 sx->early_pipe_active ? authbits
1546 regex_match_and_setup(regex_AUTH, sx->buffer, 0, -1)
1549 uschar * names = NULL;
1550 expand_nmax = -1; /* reset */
1552 #ifndef DISABLE_PIPE_CONNECT
1553 if (!sx->early_pipe_active)
1555 names = string_copyn(expand_nstring[1], expand_nlength[1]);
1557 /* Must not do this check until after we have saved the result of the
1558 regex match above as the check could be another RE. */
1560 if ( require_auth == OK
1561 || verify_check_given_host(CUSS &ob->hosts_try_auth, host) == OK)
1563 DEBUG(D_transport) debug_printf("scanning authentication mechanisms\n");
1564 fail_reason = US"no common mechanisms were found";
1566 #ifndef DISABLE_PIPE_CONNECT
1567 if (sx->early_pipe_active)
1569 /* Scan our authenticators (which support use by a client and were offered
1570 by the server (checked at cache-write time)), not suppressed by
1571 client_condition. If one is found, attempt to authenticate by calling its
1572 client function. We are limited to supporting up to 16 authenticator
1573 public-names by the number of bits in a short. */
1579 for (bitnum = 0, au = auths;
1580 !f.smtp_authenticated && au && bitnum < 16;
1581 bitnum++, au = au->next) if (authbits & BIT(bitnum))
1583 if ( au->client_condition
1584 && !expand_check_condition(au->client_condition, au->name,
1585 US"client authenticator"))
1587 DEBUG(D_transport) debug_printf("skipping %s authenticator: %s\n",
1588 au->name, "client_condition is false");
1592 /* Found data for a listed mechanism. Call its client entry. Set
1593 a flag in the outblock so that data is overwritten after sending so
1594 that reflections don't show it. */
1596 fail_reason = US"authentication attempt(s) failed";
1598 if ((rc = try_authenticator(sx, au)) != OK)
1605 /* Scan the configured authenticators looking for one which is configured
1606 for use as a client, which is not suppressed by client_condition, and
1607 whose name matches an authentication mechanism supported by the server.
1608 If one is found, attempt to authenticate by calling its client function.
1611 for (auth_instance * au = auths; !f.smtp_authenticated && au; au = au->next)
1616 || ( au->client_condition
1617 && !expand_check_condition(au->client_condition, au->name,
1618 US"client authenticator")))
1620 DEBUG(D_transport) debug_printf("skipping %s authenticator: %s\n",
1622 (au->client)? "client_condition is false" :
1623 "not configured as a client");
1627 /* Loop to scan supported server mechanisms */
1631 int len = Ustrlen(au->public_name);
1634 while (isspace(*p)) p++;
1636 if (strncmpic(au->public_name, p, len) != 0 ||
1637 (p[len] != 0 && !isspace(p[len])))
1639 while (*p != 0 && !isspace(*p)) p++;
1643 /* Found data for a listed mechanism. Call its client entry. Set
1644 a flag in the outblock so that data is overwritten after sending so
1645 that reflections don't show it. */
1647 fail_reason = US"authentication attempt(s) failed";
1649 if ((rc = try_authenticator(sx, au)) != OK)
1652 break; /* If not authenticated, try next authenticator */
1653 } /* Loop for scanning supported server mechanisms */
1654 } /* Loop for further authenticators */
1658 /* If we haven't authenticated, but are required to, give up. */
1660 if (require_auth == OK && !f.smtp_authenticated)
1662 #ifndef DISABLE_PIPE_CONNECT
1663 invalidate_ehlo_cache_entry(sx);
1665 set_errno_nohost(sx->addrlist, ERRNO_AUTHFAIL,
1666 string_sprintf("authentication required but %s", fail_reason), DEFER,
1667 FALSE, &sx->delivery_start);
1675 /* Construct AUTH appendix string for MAIL TO */
1678 sx context for smtp connection
1679 p point in sx->buffer to build string
1680 addrlist chain of potential addresses to deliver
1682 Globals f.smtp_authenticated
1683 client_authenticated_sender
1684 Return True on error, otherwise buffer has (possibly empty) terminated string
1688 smtp_mail_auth_str(smtp_context * sx, uschar * p, address_item * addrlist)
1690 smtp_transport_options_block * ob = sx->conn_args.ob;
1691 uschar * local_authenticated_sender = authenticated_sender;
1694 debug_printf("smtp_mail_auth_str: as<%s> os<%s> SA<%s>\n",
1695 authenticated_sender, ob->authenticated_sender, f.smtp_authenticated?"Y":"N");
1698 if (ob->authenticated_sender)
1700 uschar * new = expand_string(ob->authenticated_sender);
1703 if (!f.expand_string_forcedfail)
1705 uschar *message = string_sprintf("failed to expand "
1706 "authenticated_sender: %s", expand_string_message);
1707 set_errno_nohost(addrlist, ERRNO_EXPANDFAIL, message, DEFER, FALSE, &sx->delivery_start);
1712 local_authenticated_sender = new;
1715 /* Add the authenticated sender address if present */
1717 if ( (f.smtp_authenticated || ob->authenticated_sender_force)
1718 && local_authenticated_sender)
1720 string_format_nt(p, sizeof(sx->buffer) - (p-sx->buffer), " AUTH=%s",
1721 auth_xtextencode(local_authenticated_sender,
1722 Ustrlen(local_authenticated_sender)));
1723 client_authenticated_sender = string_copy(local_authenticated_sender);
1733 typedef struct smtp_compare_s
1735 uschar * current_sender_address;
1736 struct transport_instance * tblock;
1740 /* Create a unique string that identifies this message, it is based on
1741 sender_address, helo_data and tls_certificate if enabled.
1745 smtp_local_identity(uschar * sender, struct transport_instance * tblock)
1747 address_item * addr1;
1748 uschar * if1 = US"";
1749 uschar * helo1 = US"";
1751 uschar * tlsc1 = US"";
1753 uschar * save_sender_address = sender_address;
1754 uschar * local_identity = NULL;
1755 smtp_transport_options_block * ob = SOB tblock->options_block;
1757 sender_address = sender;
1759 addr1 = deliver_make_addr (sender, TRUE);
1760 deliver_set_expansions(addr1);
1763 if1 = expand_string(ob->interface);
1766 helo1 = expand_string(ob->helo_data);
1769 if (ob->tls_certificate)
1770 tlsc1 = expand_string(ob->tls_certificate);
1771 local_identity = string_sprintf ("%s^%s^%s", if1, helo1, tlsc1);
1773 local_identity = string_sprintf ("%s^%s", if1, helo1);
1776 deliver_set_expansions(NULL);
1777 sender_address = save_sender_address;
1779 return local_identity;
1784 /* This routine is a callback that is called from transport_check_waiting.
1785 This function will evaluate the incoming message versus the previous
1786 message. If the incoming message is using a different local identity then
1787 we will veto this new message. */
1790 smtp_are_same_identities(uschar * message_id, smtp_compare_t * s_compare)
1792 uschar * message_local_identity,
1793 * current_local_identity,
1794 * new_sender_address;
1796 current_local_identity =
1797 smtp_local_identity(s_compare->current_sender_address, s_compare->tblock);
1799 if (!(new_sender_address = spool_sender_from_msgid(message_id)))
1803 message_local_identity =
1804 smtp_local_identity(new_sender_address, s_compare->tblock);
1806 return Ustrcmp(current_local_identity, message_local_identity) == 0;
1812 ehlo_response(uschar * buf, unsigned checks)
1814 size_t bsize = Ustrlen(buf);
1816 /* debug_printf("%s: check for 0x%04x\n", __FUNCTION__, checks); */
1819 if ( checks & OPTION_TLS
1820 && pcre_exec(regex_STARTTLS, NULL, CS buf, bsize, 0, PCRE_EOPT, NULL, 0) < 0)
1822 checks &= ~OPTION_TLS;
1824 if ( checks & OPTION_IGNQ
1825 && pcre_exec(regex_IGNOREQUOTA, NULL, CS buf, bsize, 0,
1826 PCRE_EOPT, NULL, 0) < 0)
1827 checks &= ~OPTION_IGNQ;
1829 if ( checks & OPTION_CHUNKING
1830 && pcre_exec(regex_CHUNKING, NULL, CS buf, bsize, 0, PCRE_EOPT, NULL, 0) < 0)
1831 checks &= ~OPTION_CHUNKING;
1833 #ifndef DISABLE_PRDR
1834 if ( checks & OPTION_PRDR
1835 && pcre_exec(regex_PRDR, NULL, CS buf, bsize, 0, PCRE_EOPT, NULL, 0) < 0)
1837 checks &= ~OPTION_PRDR;
1840 if ( checks & OPTION_UTF8
1841 && pcre_exec(regex_UTF8, NULL, CS buf, bsize, 0, PCRE_EOPT, NULL, 0) < 0)
1843 checks &= ~OPTION_UTF8;
1845 if ( checks & OPTION_DSN
1846 && pcre_exec(regex_DSN, NULL, CS buf, bsize, 0, PCRE_EOPT, NULL, 0) < 0)
1847 checks &= ~OPTION_DSN;
1849 if ( checks & OPTION_PIPE
1850 && pcre_exec(regex_PIPELINING, NULL, CS buf, bsize, 0,
1851 PCRE_EOPT, NULL, 0) < 0)
1852 checks &= ~OPTION_PIPE;
1854 if ( checks & OPTION_SIZE
1855 && pcre_exec(regex_SIZE, NULL, CS buf, bsize, 0, PCRE_EOPT, NULL, 0) < 0)
1856 checks &= ~OPTION_SIZE;
1858 #ifndef DISABLE_PIPE_CONNECT
1859 if ( checks & OPTION_EARLY_PIPE
1860 && pcre_exec(regex_EARLY_PIPE, NULL, CS buf, bsize, 0,
1861 PCRE_EOPT, NULL, 0) < 0)
1863 checks &= ~OPTION_EARLY_PIPE;
1865 /* debug_printf("%s: found 0x%04x\n", __FUNCTION__, checks); */
1871 /* Callback for emitting a BDAT data chunk header.
1873 If given a nonzero size, first flush any buffered SMTP commands
1874 then emit the command.
1876 Reap previous SMTP command responses if requested, and always reap
1877 the response from a previous BDAT command.
1880 tctx transport context
1881 chunk_size value for SMTP BDAT command
1883 tc_chunk_last add LAST option to SMTP BDAT command
1884 tc_reap_prev reap response to previous SMTP commands
1888 DEFER TLS error on first read (EHLO-resp); errno set
1892 smtp_chunk_cmd_callback(transport_ctx * tctx, unsigned chunk_size,
1895 smtp_transport_options_block * ob = SOB tctx->tblock->options_block;
1896 smtp_context * sx = tctx->smtp_context;
1900 /* Write SMTP chunk header command. If not reaping responses, note that
1901 there may be more writes (like, the chunk data) done soon. */
1905 #ifndef DISABLE_PIPE_CONNECT
1906 BOOL new_conn = !!(sx->outblock.conn_args);
1908 if((cmd_count = smtp_write_command(sx,
1909 flags & tc_reap_prev ? SCMD_FLUSH : SCMD_MORE,
1910 "BDAT %u%s\r\n", chunk_size, flags & tc_chunk_last ? " LAST" : "")
1911 ) < 0) return ERROR;
1912 if (flags & tc_chunk_last)
1913 data_command = string_copy(big_buffer); /* Save for later error message */
1914 #ifndef DISABLE_PIPE_CONNECT
1915 /* That command write could have been the one that made the connection.
1916 Copy the fd from the client conn ctx (smtp transport specific) to the
1917 generic transport ctx. */
1920 tctx->u.fd = sx->outblock.cctx->sock;
1924 prev_cmd_count = cmd_count += sx->cmd_count;
1926 /* Reap responses for any previous, but not one we just emitted */
1930 if (sx->pending_BDAT)
1933 if (flags & tc_reap_prev && prev_cmd_count > 0)
1935 DEBUG(D_transport) debug_printf("look for %d responses"
1936 " for previous pipelined cmds\n", prev_cmd_count);
1938 switch(sync_responses(sx, prev_cmd_count, 0))
1940 case 1: /* 2xx (only) => OK */
1941 case 3: sx->good_RCPT = TRUE; /* 2xx & 5xx => OK & progress made */
1942 case 2: sx->completed_addr = TRUE; /* 5xx (only) => progress made */
1943 case 0: break; /* No 2xx or 5xx, but no probs */
1945 case -5: errno = ERRNO_TLSFAILURE;
1947 #ifndef DISABLE_PIPE_CONNECT
1948 case -4: /* non-2xx for pipelined banner or EHLO */
1950 case -1: /* Timeout on RCPT */
1951 default: return ERROR; /* I/O error, or any MAIL/DATA error */
1954 if (!sx->pending_BDAT)
1955 pipelining_active = FALSE;
1958 /* Reap response for an outstanding BDAT */
1960 if (sx->pending_BDAT)
1962 DEBUG(D_transport) debug_printf("look for one response for BDAT\n");
1964 if (!smtp_read_response(sx, sx->buffer, sizeof(sx->buffer), '2',
1965 ob->command_timeout))
1967 if (errno == 0 && sx->buffer[0] == '4')
1969 errno = ERRNO_DATA4XX; /*XXX does this actually get used? */
1970 sx->addrlist->more_errno |=
1971 ((sx->buffer[1] - '0')*10 + sx->buffer[2] - '0') << 8;
1976 sx->pending_BDAT = FALSE;
1977 pipelining_active = FALSE;
1979 else if (chunk_size > 0)
1980 sx->pending_BDAT = TRUE;
1983 sx->cmd_count = cmd_count;
1989 /*************************************************
1990 * Make connection for given message *
1991 *************************************************/
1995 sx connection context
1996 suppress_tls if TRUE, don't attempt a TLS connection - this is set for
1997 a second attempt after TLS initialization fails
1999 Returns: OK - the connection was made and the delivery attempted;
2000 fd is set in the conn context, tls_out set up.
2001 DEFER - the connection could not be made, or something failed
2002 while setting up the SMTP session, or there was a
2003 non-message-specific error, such as a timeout.
2004 ERROR - helo_data or add_headers or authenticated_sender is
2005 specified for this transport, and the string failed
2009 smtp_setup_conn(smtp_context * sx, BOOL suppress_tls)
2011 smtp_transport_options_block * ob = sx->conn_args.tblock->options_block;
2012 BOOL pass_message = FALSE;
2013 uschar * message = NULL;
2016 uschar * tls_errstr;
2019 sx->conn_args.ob = ob;
2021 sx->lmtp = strcmpic(ob->protocol, US"lmtp") == 0;
2022 sx->smtps = strcmpic(ob->protocol, US"smtps") == 0;
2023 /* sx->ok = FALSE; */
2024 sx->send_rset = TRUE;
2025 sx->send_quit = TRUE;
2026 sx->setting_up = TRUE;
2028 /* sx->esmtp_sent = FALSE; */
2030 /* sx->utf8_needed = FALSE; */
2032 sx->dsn_all_lasthop = TRUE;
2034 /* sx->conn_args.dane = FALSE; */
2036 verify_check_given_host(CUSS &ob->hosts_require_dane, sx->conn_args.host) == OK;
2038 #ifndef DISABLE_PIPE_CONNECT
2039 /* sx->early_pipe_active = sx->early_pipe_ok = FALSE; */
2040 /* sx->ehlo_resp.cleartext_features = sx->ehlo_resp.crypted_features = 0; */
2041 /* sx->pending_BANNER = sx->pending_EHLO = sx->pending_MAIL = FALSE; */
2044 if ((sx->max_mail = sx->conn_args.tblock->connection_max_messages) == 0) sx->max_mail = 999999;
2045 if ((sx->max_rcpt = sx->conn_args.tblock->max_addresses) == 0) sx->max_rcpt = 999999;
2046 /* sx->peer_offered = 0; */
2047 /* sx->avoid_option = 0; */
2048 sx->igquotstr = US"";
2049 if (!sx->helo_data) sx->helo_data = ob->helo_data;
2050 #ifdef EXPERIMENTAL_DSN_INFO
2051 /* sx->smtp_greeting = NULL; */
2052 /* sx->helo_response = NULL; */
2055 smtp_command = US"initial connection";
2056 /* sx->buffer[0] = '\0'; */
2058 /* Set up the buffer for reading SMTP response packets. */
2060 sx->inblock.buffer = sx->inbuffer;
2061 sx->inblock.buffersize = sizeof(sx->inbuffer);
2062 sx->inblock.ptr = sx->inbuffer;
2063 sx->inblock.ptrend = sx->inbuffer;
2065 /* Set up the buffer for holding SMTP commands while pipelining */
2067 sx->outblock.buffer = sx->outbuffer;
2068 sx->outblock.buffersize = sizeof(sx->outbuffer);
2069 sx->outblock.ptr = sx->outbuffer;
2070 /* sx->outblock.cmd_count = 0; */
2071 /* sx->outblock.authenticating = FALSE; */
2072 /* sx->outblock.conn_args = NULL; */
2074 /* Reset the parameters of a TLS session. */
2077 tls_out.cipher = NULL; /* the one we may use for this transport */
2078 tls_out.ourcert = NULL;
2079 tls_out.peercert = NULL;
2080 tls_out.peerdn = NULL;
2084 tls_out.ocsp = OCSP_NOT_REQ;
2085 #ifndef DISABLE_TLS_RESUME
2086 tls_out.resumption = 0;
2090 /* Flip the legacy TLS-related variables over to the outbound set in case
2091 they're used in the context of the transport. Don't bother resetting
2092 afterward (when being used by a transport) as we're in a subprocess.
2093 For verify, unflipped once the callout is dealt with */
2095 tls_modify_variables(&tls_out);
2100 set_errno_nohost(sx->addrlist, ERRNO_TLSFAILURE, US"TLS support not available",
2101 DEFER, FALSE, &sx->delivery_start);
2106 /* If we have a proxied TLS connection, check usability for this message */
2108 if (continue_hostname && continue_proxy_cipher)
2111 const uschar * sni = US"";
2113 # ifdef SUPPORT_DANE
2114 /* Check if the message will be DANE-verified; if so force its SNI */
2116 tls_out.dane_verified = FALSE;
2117 smtp_port_for_connect(sx->conn_args.host, sx->port);
2118 if ( sx->conn_args.host->dnssec == DS_YES
2119 && ( sx->dane_required
2120 || verify_check_given_host(CUSS &ob->hosts_try_dane, sx->conn_args.host) == OK
2122 switch (rc = tlsa_lookup(sx->conn_args.host, &sx->conn_args.tlsa_dnsa, sx->dane_required))
2124 case OK: sx->conn_args.dane = TRUE;
2125 ob->tls_tempfail_tryclear = FALSE; /* force TLS */
2126 ob->tls_sni = sx->conn_args.host->name; /* force SNI */
2128 case FAIL_FORCED: break;
2129 default: set_errno_nohost(sx->addrlist, ERRNO_DNSDEFER,
2130 string_sprintf("DANE error: tlsa lookup %s",
2132 rc, FALSE, &sx->delivery_start);
2133 # ifndef DISABLE_EVENT
2134 (void) event_raise(sx->conn_args.tblock->event_action,
2135 US"dane:fail", sx->dane_required
2136 ? US"dane-required" : US"dnssec-invalid");
2142 /* If the SNI or the DANE status required for the new message differs from the
2143 existing conn drop the connection to force a new one. */
2145 if (ob->tls_sni && !(sni = expand_cstring(ob->tls_sni)))
2146 log_write(0, LOG_MAIN|LOG_PANIC,
2147 "<%s>: failed to expand transport's tls_sni value: %s",
2148 sx->addrlist->address, expand_string_message);
2150 # ifdef SUPPORT_DANE
2151 if ( (continue_proxy_sni ? (Ustrcmp(continue_proxy_sni, sni) == 0) : !*sni)
2152 && continue_proxy_dane == sx->conn_args.dane)
2154 tls_out.sni = US sni;
2155 if ((tls_out.dane_verified = continue_proxy_dane))
2156 sx->conn_args.host->dnssec = DS_YES;
2159 if ((continue_proxy_sni ? (Ustrcmp(continue_proxy_sni, sni) == 0) : !*sni))
2160 tls_out.sni = US sni;
2165 debug_printf("Closing proxied-TLS connection due to SNI mismatch\n");
2167 HDEBUG(D_transport|D_acl|D_v) debug_printf_indent(" SMTP>> QUIT\n");
2168 write(0, "QUIT\r\n", 6);
2170 continue_hostname = continue_proxy_cipher = NULL;
2171 f.continue_more = FALSE;
2172 continue_sequence = 1; /* Unfortunately, this process cannot affect success log
2173 which is done by delivery proc. Would have to pass this
2174 back through reporting pipe. */
2177 #endif /*!DISABLE_TLS*/
2179 /* Make a connection to the host if this isn't a continued delivery, and handle
2180 the initial interaction and HELO/EHLO/LHLO. Connect timeout errors are handled
2181 specially so they can be identified for retries. */
2183 if (!continue_hostname)
2186 HDEBUG(D_verify) debug_printf("interface=%s port=%d\n", sx->conn_args.interface, sx->port);
2188 /* Arrange to report to calling process this is a new connection */
2190 clearflag(sx->first_addr, af_cont_conn);
2191 setflag(sx->first_addr, af_new_conn);
2193 /* Get the actual port the connection will use, into sx->conn_args.host */
2195 smtp_port_for_connect(sx->conn_args.host, sx->port);
2198 /* Do TLSA lookup for DANE */
2200 tls_out.dane_verified = FALSE;
2201 tls_out.tlsa_usage = 0;
2203 if (sx->conn_args.host->dnssec == DS_YES)
2206 if( sx->dane_required
2207 || verify_check_given_host(CUSS &ob->hosts_try_dane, sx->conn_args.host) == OK
2209 switch (rc = tlsa_lookup(sx->conn_args.host, &sx->conn_args.tlsa_dnsa, sx->dane_required))
2211 case OK: sx->conn_args.dane = TRUE;
2212 ob->tls_tempfail_tryclear = FALSE; /* force TLS */
2213 ob->tls_sni = sx->conn_args.host->name; /* force SNI */
2215 case FAIL_FORCED: break;
2216 default: set_errno_nohost(sx->addrlist, ERRNO_DNSDEFER,
2217 string_sprintf("DANE error: tlsa lookup %s",
2219 rc, FALSE, &sx->delivery_start);
2220 # ifndef DISABLE_EVENT
2221 (void) event_raise(sx->conn_args.tblock->event_action,
2222 US"dane:fail", sx->dane_required
2223 ? US"dane-required" : US"dnssec-invalid");
2228 else if (sx->dane_required)
2230 set_errno_nohost(sx->addrlist, ERRNO_DNSDEFER,
2231 string_sprintf("DANE error: %s lookup not DNSSEC", sx->conn_args.host->name),
2232 FAIL, FALSE, &sx->delivery_start);
2233 # ifndef DISABLE_EVENT
2234 (void) event_raise(sx->conn_args.tblock->event_action,
2235 US"dane:fail", US"dane-required");
2242 /* Make the TCP connection */
2244 sx->cctx.tls_ctx = NULL;
2245 sx->inblock.cctx = sx->outblock.cctx = &sx->cctx;
2246 #ifdef EXPERIMENTAL_ESMTP_LIMITS
2247 sx->peer_limit_mail = sx->peer_limit_rcpt = sx->peer_limit_rcptdom =
2249 sx->avoid_option = sx->peer_offered = smtp_peer_options = 0;
2251 #ifndef DISABLE_PIPE_CONNECT
2252 if ( verify_check_given_host(CUSS &ob->hosts_pipe_connect,
2253 sx->conn_args.host) == OK)
2255 /* We don't find out the local ip address until the connect, so if
2256 the helo string might use it avoid doing early-pipelining. */
2259 || !Ustrstr(sx->helo_data, "$sending_ip_address")
2260 || Ustrstr(sx->helo_data, "def:sending_ip_address")
2263 sx->early_pipe_ok = TRUE;
2264 if ( read_ehlo_cache_entry(sx)
2265 && sx->ehlo_resp.cleartext_features & OPTION_EARLY_PIPE)
2268 debug_printf("Using cached cleartext PIPE_CONNECT\n");
2269 sx->early_pipe_active = TRUE;
2270 sx->peer_offered = sx->ehlo_resp.cleartext_features;
2273 else DEBUG(D_transport)
2274 debug_printf("helo needs $sending_ip_address\n");
2277 if (sx->early_pipe_active)
2278 sx->outblock.conn_args = &sx->conn_args;
2282 blob lazy_conn = {.data = NULL};
2283 /* For TLS-connect, a TFO lazy-connect is useful since the Client Hello
2284 can go on the TCP SYN. */
2286 if ((sx->cctx.sock = smtp_connect(&sx->conn_args,
2287 sx->smtps ? &lazy_conn : NULL)) < 0)
2289 set_errno_nohost(sx->addrlist,
2290 errno == ETIMEDOUT ? ERRNO_CONNECTTIMEOUT : errno,
2291 sx->verify ? US strerror(errno) : NULL,
2292 DEFER, FALSE, &sx->delivery_start);
2293 sx->send_quit = FALSE;
2297 (void) setsockopt(sx->cctx.sock, IPPROTO_TCP, TCP_QUICKACK, US &off,
2301 /* Expand the greeting message while waiting for the initial response. (Makes
2302 sense if helo_data contains ${lookup dnsdb ...} stuff). The expansion is
2303 delayed till here so that $sending_interface and $sending_port are set. */
2304 /*XXX early-pipe: they still will not be. Is there any way to find out what they
2305 will be? Somehow I doubt it. */
2308 if (!(sx->helo_data = expand_string(sx->helo_data)))
2310 log_write(0, LOG_MAIN|LOG_PANIC,
2311 "<%s>: failed to expand transport's helo_data value for callout: %s",
2312 sx->addrlist->address, expand_string_message);
2317 expand_string_message = NULL;
2318 if ((sx->helo_data = string_domain_utf8_to_alabel(sx->helo_data,
2319 &expand_string_message)),
2320 expand_string_message)
2322 log_write(0, LOG_MAIN|LOG_PANIC,
2323 "<%s>: failed to expand transport's helo_data value for callout: %s",
2324 sx->addrlist->address, expand_string_message);
2326 sx->helo_data = NULL;
2330 /* The first thing is to wait for an initial OK response. The dreaded "goto"
2331 is nevertheless a reasonably clean way of programming this kind of logic,
2332 where you want to escape on any error. */
2336 #ifndef DISABLE_PIPE_CONNECT
2337 if (sx->early_pipe_active)
2339 sx->pending_BANNER = TRUE; /* sync_responses() must eventually handle */
2340 sx->outblock.cmd_count = 1;
2345 if (!smtp_reap_banner(sx))
2346 goto RESPONSE_FAILED;
2349 #ifndef DISABLE_EVENT
2352 lookup_dnssec_authenticated = sx->conn_args.host->dnssec==DS_YES ? US"yes"
2353 : sx->conn_args.host->dnssec==DS_NO ? US"no" : NULL;
2354 s = event_raise(sx->conn_args.tblock->event_action, US"smtp:connect", sx->buffer);
2357 set_errno_nohost(sx->addrlist, ERRNO_EXPANDFAIL,
2358 string_sprintf("deferred by smtp:connect event expansion: %s", s),
2359 DEFER, FALSE, &sx->delivery_start);
2366 /* Now check if the helo_data expansion went well, and sign off cleanly if
2371 message = string_sprintf("failed to expand helo_data: %s",
2372 expand_string_message);
2373 set_errno_nohost(sx->addrlist, ERRNO_EXPANDFAIL, message, DEFER, FALSE, &sx->delivery_start);
2379 /** Debugging without sending a message
2380 sx->addrlist->transport_return = DEFER;
2384 /* Errors that occur after this point follow an SMTP command, which is
2385 left in big_buffer by smtp_write_command() for use in error messages. */
2387 smtp_command = big_buffer;
2389 /* Tell the remote who we are...
2391 February 1998: A convention has evolved that ESMTP-speaking MTAs include the
2392 string "ESMTP" in their greeting lines, so make Exim send EHLO if the
2393 greeting is of this form. The assumption was that the far end supports it
2394 properly... but experience shows that there are some that give 5xx responses,
2395 even though the banner includes "ESMTP" (there's a bloody-minded one that
2396 says "ESMTP not spoken here"). Cope with that case.
2398 September 2000: Time has passed, and it seems reasonable now to always send
2399 EHLO at the start. It is also convenient to make the change while installing
2402 July 2003: Joachim Wieland met a broken server that advertises "PIPELINING"
2403 but times out after sending MAIL FROM, RCPT TO and DATA all together. There
2404 would be no way to send out the mails, so there is now a host list
2405 "hosts_avoid_esmtp" that disables ESMTP for special hosts and solves the
2406 PIPELINING problem as well. Maybe it can also be useful to cure other
2407 problems with broken servers.
2409 Exim originally sent "Helo" at this point and ran for nearly a year that way.
2410 Then somebody tried it with a Microsoft mailer... It seems that all other
2411 mailers use upper case for some reason (the RFC is quite clear about case
2412 independence) so, for peace of mind, I gave in. */
2414 sx->esmtp = verify_check_given_host(CUSS &ob->hosts_avoid_esmtp, sx->conn_args.host) != OK;
2416 /* Alas; be careful, since this goto is not an error-out, so conceivably
2417 we might set data between here and the target which we assume to exist
2418 and be usable. I can see this coming back to bite us. */
2422 smtp_peer_options |= OPTION_TLS;
2423 suppress_tls = FALSE;
2424 ob->tls_tempfail_tryclear = FALSE;
2425 smtp_command = US"SSL-on-connect";
2432 if (smtp_write_command(sx,
2433 #ifndef DISABLE_PIPE_CONNECT
2434 sx->early_pipe_active ? SCMD_BUFFER :
2437 "%s %s\r\n", sx->lmtp ? "LHLO" : "EHLO", sx->helo_data) < 0)
2439 sx->esmtp_sent = TRUE;
2441 #ifndef DISABLE_PIPE_CONNECT
2442 if (sx->early_pipe_active)
2444 sx->pending_EHLO = TRUE;
2446 /* If we have too many authenticators to handle and might need to AUTH
2447 for this transport, pipeline no further as we will need the
2448 list of auth methods offered. Reap the banner and EHLO. */
2450 if ( (ob->hosts_require_auth || ob->hosts_try_auth)
2451 && f.smtp_in_early_pipe_no_auth)
2453 DEBUG(D_transport) debug_printf("may need to auth, so pipeline no further\n");
2454 if (smtp_write_command(sx, SCMD_FLUSH, NULL) < 0)
2456 if (sync_responses(sx, 2, 0) != 0)
2459 debug_printf("failed reaping pipelined cmd responses\n");
2460 goto RESPONSE_FAILED;
2462 sx->early_pipe_active = FALSE;
2467 if (!smtp_reap_ehlo(sx))
2468 goto RESPONSE_FAILED;
2472 debug_printf("not sending EHLO (host matches hosts_avoid_esmtp)\n");
2474 #ifndef DISABLE_PIPE_CONNECT
2475 if (!sx->early_pipe_active)
2480 int n = sizeof(sx->buffer);
2481 uschar * rsp = sx->buffer;
2483 if (sx->esmtp_sent && (n = Ustrlen(sx->buffer) + 1) < sizeof(sx->buffer)/2)
2484 { rsp = sx->buffer + n; n = sizeof(sx->buffer) - n; }
2486 if (smtp_write_command(sx, SCMD_FLUSH, "HELO %s\r\n", sx->helo_data) < 0)
2488 good_response = smtp_read_response(sx, rsp, n, '2', ob->command_timeout);
2489 #ifdef EXPERIMENTAL_DSN_INFO
2490 sx->helo_response = string_copy(rsp);
2494 /* Handle special logging for a closed connection after HELO
2495 when had previously sent EHLO */
2497 if (rsp != sx->buffer && rsp[0] == 0 && (errno == 0 || errno == ECONNRESET))
2499 errno = ERRNO_SMTPCLOSED;
2500 goto EHLOHELO_FAILED;
2502 memmove(sx->buffer, rsp, Ustrlen(rsp));
2503 goto RESPONSE_FAILED;
2507 if (sx->esmtp || sx->lmtp)
2509 #ifndef DISABLE_PIPE_CONNECT
2510 if (!sx->early_pipe_active)
2513 sx->peer_offered = ehlo_response(sx->buffer,
2514 OPTION_TLS /* others checked later */
2515 #ifndef DISABLE_PIPE_CONNECT
2516 | (sx->early_pipe_ok
2518 | OPTION_CHUNKING | OPTION_PRDR | OPTION_DSN | OPTION_PIPE | OPTION_SIZE
2527 #ifdef EXPERIMENTAL_ESMTP_LIMITS
2528 if (tls_out.active.sock >= 0 || !(sx->peer_offered & OPTION_TLS))
2530 ehlo_response_limits_read(sx);
2531 ehlo_response_limits_apply(sx);
2534 #ifndef DISABLE_PIPE_CONNECT
2535 if (sx->early_pipe_ok)
2537 sx->ehlo_resp.cleartext_features = sx->peer_offered;
2539 if ( (sx->peer_offered & (OPTION_PIPE | OPTION_EARLY_PIPE))
2540 == (OPTION_PIPE | OPTION_EARLY_PIPE))
2542 DEBUG(D_transport) debug_printf("PIPE_CONNECT usable in future for this IP\n");
2543 sx->ehlo_resp.cleartext_auths = study_ehlo_auths(sx);
2544 write_ehlo_cache_entry(sx);
2550 /* Set tls_offered if the response to EHLO specifies support for STARTTLS. */
2553 smtp_peer_options |= sx->peer_offered & OPTION_TLS;
2558 /* For continuing deliveries down the same channel, having re-exec'd the socket
2559 is the standard input; for a socket held open from verify it is recorded
2560 in the cutthrough context block. Either way we don't need to redo EHLO here
2561 (but may need to do so for TLS - see below).
2562 Set up the pointer to where subsequent commands will be left, for
2563 error messages. Note that smtp_peer_options will have been
2564 set from the command line if they were set in the process that passed the
2567 /*XXX continue case needs to propagate DSN_INFO, prob. in deliver.c
2568 as the continue goes via transport_pass_socket() and doublefork and exec.
2569 It does not wait. Unclear how we keep separate host's responses
2570 separate - we could match up by host ip+port as a bodge. */
2574 if (cutthrough.cctx.sock >= 0 && cutthrough.callout_hold_only)
2576 sx->cctx = cutthrough.cctx;
2577 sx->conn_args.host->port = sx->port = cutthrough.host.port;
2581 sx->cctx.sock = 0; /* stdin */
2582 sx->cctx.tls_ctx = NULL;
2583 smtp_port_for_connect(sx->conn_args.host, sx->port); /* Record the port that was used */
2585 sx->inblock.cctx = sx->outblock.cctx = &sx->cctx;
2586 smtp_command = big_buffer;
2587 sx->peer_offered = smtp_peer_options;
2588 #ifdef EXPERIMENTAL_ESMTP_LIMITS
2589 /* Limits passed by cmdline over exec. */
2590 ehlo_limits_apply(sx,
2591 sx->peer_limit_mail = continue_limit_mail,
2592 sx->peer_limit_rcpt = continue_limit_rcpt,
2593 sx->peer_limit_rcptdom = continue_limit_rcptdom);
2595 sx->helo_data = NULL; /* ensure we re-expand ob->helo_data */
2597 /* For a continued connection with TLS being proxied for us, or a
2598 held-open verify connection with TLS, nothing more to do. */
2600 if ( continue_proxy_cipher
2601 || (cutthrough.cctx.sock >= 0 && cutthrough.callout_hold_only
2602 && cutthrough.is_tls)
2605 sx->pipelining_used = pipelining_active = !!(smtp_peer_options & OPTION_PIPE);
2606 HDEBUG(D_transport) debug_printf("continued connection, %s TLS\n",
2607 continue_proxy_cipher ? "proxied" : "verify conn with");
2610 HDEBUG(D_transport) debug_printf("continued connection, no TLS\n");
2613 /* If TLS is available on this connection, whether continued or not, attempt to
2614 start up a TLS session, unless the host is in hosts_avoid_tls. If successful,
2615 send another EHLO - the server may give a different answer in secure mode. We
2616 use a separate buffer for reading the response to STARTTLS so that if it is
2617 negative, the original EHLO data is available for subsequent analysis, should
2618 the client not be required to use TLS. If the response is bad, copy the buffer
2619 for error analysis. */
2622 if ( smtp_peer_options & OPTION_TLS
2624 && verify_check_given_host(CUSS &ob->hosts_avoid_tls, sx->conn_args.host) != OK
2626 || verify_check_given_host(CUSS &ob->hosts_verify_avoid_tls, sx->conn_args.host) != OK
2629 uschar buffer2[4096];
2631 if (smtp_write_command(sx, SCMD_FLUSH, "STARTTLS\r\n") < 0)
2634 #ifndef DISABLE_PIPE_CONNECT
2635 /* If doing early-pipelining reap the banner and EHLO-response but leave
2636 the response for the STARTTLS we just sent alone. On fail, assume wrong
2637 cached capability and retry with the pipelining disabled. */
2639 if (sx->early_pipe_active && sync_responses(sx, 2, 0) != 0)
2642 debug_printf("failed reaping pipelined cmd responses\n");
2643 close(sx->cctx.sock);
2645 sx->early_pipe_active = FALSE;
2646 goto PIPE_CONNECT_RETRY;
2650 /* If there is an I/O error, transmission of this message is deferred. If
2651 there is a temporary rejection of STARRTLS and tls_tempfail_tryclear is
2652 false, we also defer. However, if there is a temporary rejection of STARTTLS
2653 and tls_tempfail_tryclear is true, or if there is an outright rejection of
2654 STARTTLS, we carry on. This means we will try to send the message in clear,
2655 unless the host is in hosts_require_tls (tested below). */
2657 if (!smtp_read_response(sx, buffer2, sizeof(buffer2), '2', ob->command_timeout))
2661 || (buffer2[0] == '4' && !ob->tls_tempfail_tryclear)
2664 Ustrncpy(sx->buffer, buffer2, sizeof(sx->buffer));
2665 sx->buffer[sizeof(sx->buffer)-1] = '\0';
2666 goto RESPONSE_FAILED;
2670 /* STARTTLS accepted: try to negotiate a TLS session. */
2675 if (!tls_client_start(&sx->cctx, &sx->conn_args, sx->addrlist, &tls_out, &tls_errstr))
2677 /* TLS negotiation failed; give an error. From outside, this function may
2678 be called again to try in clear on a new connection, if the options permit
2679 it for this host. */
2681 DEBUG(D_tls) debug_printf("TLS session fail: %s\n", tls_errstr);
2683 # ifdef SUPPORT_DANE
2684 if (sx->conn_args.dane)
2686 log_write(0, LOG_MAIN,
2687 "DANE attempt failed; TLS connection to %s [%s]: %s",
2688 sx->conn_args.host->name, sx->conn_args.host->address, tls_errstr);
2689 # ifndef DISABLE_EVENT
2690 (void) event_raise(sx->conn_args.tblock->event_action,
2691 US"dane:fail", US"validation-failure"); /* could do with better detail */
2696 errno = ERRNO_TLSFAILURE;
2697 message = string_sprintf("TLS session: %s", tls_errstr);
2698 sx->send_quit = FALSE;
2701 sx->send_tlsclose = TRUE;
2703 /* TLS session is set up. Check the inblock fill level. If there is
2704 content then as we have not yet done a tls read it must have arrived before
2705 the TLS handshake, in-clear. That violates the sync requirement of the
2706 STARTTLS RFC, so fail. */
2708 if (sx->inblock.ptr != sx->inblock.ptrend)
2712 int i = sx->inblock.ptrend - sx->inblock.ptr;
2713 debug_printf("unused data in input buffer after ack for STARTTLS:\n"
2715 i > 100 ? 100 : i, sx->inblock.ptr, i > 100 ? "..." : "");
2717 tls_errstr = US"synch error before connect";
2718 goto TLS_CONN_FAILED;
2721 smtp_peer_options_wrap = smtp_peer_options;
2722 for (address_item * addr = sx->addrlist; addr; addr = addr->next)
2723 if (addr->transport_return == PENDING_DEFER)
2725 addr->cipher = tls_out.cipher;
2726 addr->ourcert = tls_out.ourcert;
2727 addr->peercert = tls_out.peercert;
2728 addr->peerdn = tls_out.peerdn;
2729 addr->ocsp = tls_out.ocsp;
2730 addr->tlsver = tls_out.ver;
2735 /* if smtps, we'll have smtp_command set to something else; always safe to
2737 smtp_command = big_buffer;
2739 /* If we started TLS, redo the EHLO/LHLO exchange over the secure channel. If
2740 helo_data is null, we are dealing with a connection that was passed from
2741 another process, and so we won't have expanded helo_data above. We have to
2742 expand it here. $sending_ip_address and $sending_port are set up right at the
2743 start of the Exim process (in exim.c). */
2745 if (tls_out.active.sock >= 0)
2747 uschar * greeting_cmd;
2749 if (!sx->helo_data && !(sx->helo_data = expand_string(ob->helo_data)))
2751 uschar *message = string_sprintf("failed to expand helo_data: %s",
2752 expand_string_message);
2753 set_errno_nohost(sx->addrlist, ERRNO_EXPANDFAIL, message, DEFER, FALSE, &sx->delivery_start);
2758 #ifndef DISABLE_PIPE_CONNECT
2759 /* For SMTPS there is no cleartext early-pipe; use the crypted permission bit.
2760 We're unlikely to get the group sent and delivered before the server sends its
2761 banner, but it's still worth sending as a group.
2762 For STARTTLS allow for cleartext early-pipe but no crypted early-pipe, but not
2765 if (sx->smtps ? sx->early_pipe_ok : sx->early_pipe_active)
2767 sx->peer_offered = sx->ehlo_resp.crypted_features;
2768 if ((sx->early_pipe_active =
2769 !!(sx->ehlo_resp.crypted_features & OPTION_EARLY_PIPE)))
2770 DEBUG(D_transport) debug_printf("Using cached crypted PIPE_CONNECT\n");
2773 #ifdef EXPERIMMENTAL_ESMTP_LIMITS
2774 /* As we are about to send another EHLO, forget any LIMITS received so far. */
2775 sx->peer_limit_mail = sx->peer_limit_rcpt = sx->peer_limit_rcptdom = 0;
2776 if ((sx->max_mail = sx->conn_args.tblock->connection_max_message) == 0) sx->max_mail = 999999;
2777 if ((sx->max_rcpt = sx->conn_args.tblock->max_addresses) == 0) sx->max_rcpt = 999999;
2778 sx->single_rcpt_domain = FALSE;
2781 /* For SMTPS we need to wait for the initial OK response. */
2783 #ifndef DISABLE_PIPE_CONNECT
2784 if (sx->early_pipe_active)
2786 sx->pending_BANNER = TRUE;
2787 sx->outblock.cmd_count = 1;
2791 if (!smtp_reap_banner(sx))
2792 goto RESPONSE_FAILED;
2795 greeting_cmd = US"LHLO";
2797 greeting_cmd = US"EHLO";
2800 greeting_cmd = US"HELO";
2802 debug_printf("not sending EHLO (host matches hosts_avoid_esmtp)\n");
2805 if (smtp_write_command(sx,
2806 #ifndef DISABLE_PIPE_CONNECT
2807 sx->early_pipe_active ? SCMD_BUFFER :
2810 "%s %s\r\n", greeting_cmd, sx->helo_data) < 0)
2813 #ifndef DISABLE_PIPE_CONNECT
2814 if (sx->early_pipe_active)
2815 sx->pending_EHLO = TRUE;
2819 if (!smtp_reap_ehlo(sx))
2822 /* The GnuTLS layer in Exim only spots a server-rejection of a client
2823 cert late, under TLS1.3 - which means here; the first time we try to
2824 receive crypted data. Treat it as if it was a connect-time failure.
2825 See also the early-pipe equivalent... which will be hard; every call
2826 to sync_responses will need to check the result.
2827 It would be nicer to have GnuTLS check the cert during the handshake.
2828 Can it do that, with all the flexibility we need? */
2830 tls_errstr = US"error on first read";
2831 goto TLS_CONN_FAILED;
2834 goto RESPONSE_FAILED;
2836 smtp_peer_options = 0;
2840 /* If the host is required to use a secure channel, ensure that we
2844 # ifdef SUPPORT_DANE
2845 || sx->conn_args.dane
2847 || verify_check_given_host(CUSS &ob->hosts_require_tls, sx->conn_args.host) == OK
2850 errno = ERRNO_TLSREQUIRED;
2851 message = string_sprintf("a TLS session is required, but %s",
2852 smtp_peer_options & OPTION_TLS
2853 ? "an attempt to start TLS failed" : "the server did not offer TLS support");
2854 # if defined(SUPPORT_DANE) && !defined(DISABLE_EVENT)
2855 if (sx->conn_args.dane)
2856 (void) event_raise(sx->conn_args.tblock->event_action, US"dane:fail",
2857 smtp_peer_options & OPTION_TLS
2858 ? US"validation-failure" /* could do with better detail */
2859 : US"starttls-not-supported");
2863 #endif /*DISABLE_TLS*/
2865 /* If TLS is active, we have just started it up and re-done the EHLO command,
2866 so its response needs to be analyzed. If TLS is not active and this is a
2867 continued session down a previously-used socket, we haven't just done EHLO, so
2870 if ( !continue_hostname
2872 || tls_out.active.sock >= 0
2876 if (sx->esmtp || sx->lmtp)
2878 #ifndef DISABLE_PIPE_CONNECT
2879 if (!sx->early_pipe_active)
2882 sx->peer_offered = ehlo_response(sx->buffer,
2884 #ifndef DISABLE_PIPE_CONNECT
2885 | (sx->lmtp && ob->lmtp_ignore_quota ? OPTION_IGNQ : 0)
2886 | OPTION_DSN | OPTION_PIPE | OPTION_SIZE
2887 | OPTION_CHUNKING | OPTION_PRDR | OPTION_UTF8
2888 | (tls_out.active.sock >= 0 ? OPTION_EARLY_PIPE : 0) /* not for lmtp */
2892 | (sx->lmtp && ob->lmtp_ignore_quota ? OPTION_IGNQ : 0)
2895 # ifdef SUPPORT_I18N
2896 | (sx->addrlist->prop.utf8_msg ? OPTION_UTF8 : 0)
2897 /*XXX if we hand peercaps on to continued-conn processes,
2898 must not depend on this addr */
2902 | (ob->size_addition >= 0 ? OPTION_SIZE : 0)
2905 #ifndef DISABLE_PIPE_CONNECT
2906 if (tls_out.active.sock >= 0)
2907 sx->ehlo_resp.crypted_features = sx->peer_offered;
2910 #ifdef EXPERIMENTAL_ESMTP_LIMITS
2911 if (tls_out.active.sock >= 0 || !(sx->peer_offered & OPTION_TLS))
2913 ehlo_response_limits_read(sx);
2914 ehlo_response_limits_apply(sx);
2919 /* Set for IGNOREQUOTA if the response to LHLO specifies support and the
2920 lmtp_ignore_quota option was set. */
2922 sx->igquotstr = sx->peer_offered & OPTION_IGNQ ? US" IGNOREQUOTA" : US"";
2924 /* If the response to EHLO specified support for the SIZE parameter, note
2925 this, provided size_addition is non-negative. */
2927 smtp_peer_options |= sx->peer_offered & OPTION_SIZE;
2929 /* Note whether the server supports PIPELINING. If hosts_avoid_esmtp matched
2930 the current host, esmtp will be false, so PIPELINING can never be used. If
2931 the current host matches hosts_avoid_pipelining, don't do it. */
2933 if ( sx->peer_offered & OPTION_PIPE
2934 && verify_check_given_host(CUSS &ob->hosts_avoid_pipelining, sx->conn_args.host) != OK)
2935 smtp_peer_options |= OPTION_PIPE;
2937 DEBUG(D_transport) debug_printf("%susing PIPELINING\n",
2938 smtp_peer_options & OPTION_PIPE ? "" : "not ");
2940 if ( sx->peer_offered & OPTION_CHUNKING
2941 && verify_check_given_host(CUSS &ob->hosts_try_chunking, sx->conn_args.host) != OK)
2942 sx->peer_offered &= ~OPTION_CHUNKING;
2944 if (sx->peer_offered & OPTION_CHUNKING)
2945 DEBUG(D_transport) debug_printf("CHUNKING usable\n");
2947 #ifndef DISABLE_PRDR
2948 if ( sx->peer_offered & OPTION_PRDR
2949 && verify_check_given_host(CUSS &ob->hosts_try_prdr, sx->conn_args.host) != OK)
2950 sx->peer_offered &= ~OPTION_PRDR;
2952 if (sx->peer_offered & OPTION_PRDR)
2953 DEBUG(D_transport) debug_printf("PRDR usable\n");
2956 /* Note if the server supports DSN */
2957 smtp_peer_options |= sx->peer_offered & OPTION_DSN;
2958 DEBUG(D_transport) debug_printf("%susing DSN\n",
2959 sx->peer_offered & OPTION_DSN ? "" : "not ");
2961 #ifndef DISABLE_PIPE_CONNECT
2962 if ( sx->early_pipe_ok
2963 && !sx->early_pipe_active
2964 && tls_out.active.sock >= 0
2965 && smtp_peer_options & OPTION_PIPE
2966 && ( sx->ehlo_resp.cleartext_features | sx->ehlo_resp.crypted_features)
2967 & OPTION_EARLY_PIPE)
2969 DEBUG(D_transport) debug_printf("PIPE_CONNECT usable in future for this IP\n");
2970 sx->ehlo_resp.crypted_auths = study_ehlo_auths(sx);
2971 write_ehlo_cache_entry(sx);
2975 /* Note if the response to EHLO specifies support for the AUTH extension.
2976 If it has, check that this host is one we want to authenticate to, and do
2977 the business. The host name and address must be available when the
2978 authenticator's client driver is running. */
2980 switch (yield = smtp_auth(sx))
2982 default: goto SEND_QUIT;
2984 case FAIL_SEND: goto SEND_FAILED;
2985 case FAIL: goto RESPONSE_FAILED;
2989 sx->pipelining_used = pipelining_active = !!(smtp_peer_options & OPTION_PIPE);
2991 /* The setting up of the SMTP call is now complete. Any subsequent errors are
2992 message-specific. */
2994 sx->setting_up = FALSE;
2997 if (sx->addrlist->prop.utf8_msg)
3001 /* If the transport sets a downconversion mode it overrides any set by ACL
3004 if ((s = ob->utf8_downconvert))
3006 if (!(s = expand_string(s)))
3008 message = string_sprintf("failed to expand utf8_downconvert: %s",
3009 expand_string_message);
3010 set_errno_nohost(sx->addrlist, ERRNO_EXPANDFAIL, message, DEFER, FALSE, &sx->delivery_start);
3016 case '1': sx->addrlist->prop.utf8_downcvt = TRUE;
3017 sx->addrlist->prop.utf8_downcvt_maybe = FALSE;
3019 case '0': sx->addrlist->prop.utf8_downcvt = FALSE;
3020 sx->addrlist->prop.utf8_downcvt_maybe = FALSE;
3022 case '-': if (s[1] == '1')
3024 sx->addrlist->prop.utf8_downcvt = FALSE;
3025 sx->addrlist->prop.utf8_downcvt_maybe = TRUE;
3031 sx->utf8_needed = !sx->addrlist->prop.utf8_downcvt
3032 && !sx->addrlist->prop.utf8_downcvt_maybe;
3033 DEBUG(D_transport) if (!sx->utf8_needed)
3034 debug_printf("utf8: %s downconvert\n",
3035 sx->addrlist->prop.utf8_downcvt ? "mandatory" : "optional");
3038 /* If this is an international message we need the host to speak SMTPUTF8 */
3039 if (sx->utf8_needed && !(sx->peer_offered & OPTION_UTF8))
3041 errno = ERRNO_UTF8_FWD;
3042 goto RESPONSE_FAILED;
3044 #endif /*SUPPORT_I18N*/
3053 if (errno == ECONNREFUSED) /* first-read error on a TFO conn */
3055 /* There is a testing facility for simulating a connection timeout, as I
3056 can't think of any other way of doing this. It converts a connection
3057 refused into a timeout if the timeout is set to 999999. This is done for
3058 a 3whs connection in ip_connect(), but a TFO connection does not error
3059 there - instead it gets ECONNREFUSED on the first data read. Tracking
3060 that a TFO really was done is too hard, or we would set a
3061 sx->pending_conn_done bit and test that in smtp_reap_banner() and
3062 smtp_reap_ehlo(). That would let us also add the conn-timeout to the
3065 if (f.running_in_test_harness && ob->connect_timeout == 999999)
3067 set_errno_nohost(sx->addrlist,
3068 errno == ETIMEDOUT ? ERRNO_CONNECTTIMEOUT : errno,
3069 sx->verify ? US strerror(errno) : NULL,
3070 DEFER, FALSE, &sx->delivery_start);
3071 sx->send_quit = FALSE;
3075 /* really an error on an SMTP read */
3077 sx->send_quit = check_response(sx->conn_args.host, &errno, sx->addrlist->more_errno,
3078 sx->buffer, &code, &message, &pass_message);
3084 message = US string_sprintf("send() to %s [%s] failed: %s",
3085 sx->conn_args.host->name, sx->conn_args.host->address, strerror(errno));
3086 sx->send_quit = FALSE;
3092 message = string_sprintf("Remote host closed connection in response to %s"
3093 " (EHLO response was: %s)", smtp_command, sx->buffer);
3094 sx->send_quit = FALSE;
3098 /* This label is jumped to directly when a TLS negotiation has failed,
3099 or was not done for a host for which it is required. Values will be set
3100 in message and errno, and setting_up will always be true. Treat as
3101 a temporary error. */
3105 code = '4', yield = DEFER;
3109 /* The failure happened while setting up the call; see if the failure was
3110 a 5xx response (this will either be on connection, or following HELO - a 5xx
3111 after EHLO causes it to try HELO). If so, and there are no more hosts to try,
3112 fail all addresses, as this host is never going to accept them. For other
3113 errors during setting up (timeouts or whatever), defer all addresses, and
3114 yield DEFER, so that the host is not tried again for a while.
3116 XXX This peeking for another host feels like a layering violation. We want
3117 to note the host as unusable, but down here we shouldn't know if this was
3118 the last host to try for the addr(list). Perhaps the upper layer should be
3119 the one to do set_errno() ? The problem is that currently the addr is where
3120 errno etc. are stashed, but until we run out of hosts to try the errors are
3121 host-specific. Maybe we should enhance the host_item definition? */
3124 sx->ok = FALSE; /* For when reached by GOTO */
3125 set_errno(sx->addrlist, errno, message,
3126 sx->conn_args.host->next
3130 || errno == ERRNO_UTF8_FWD
3134 errno == ECONNREFUSED ? NULL : sx->conn_args.host,
3135 #ifdef EXPERIMENTAL_DSN_INFO
3136 sx->smtp_greeting, sx->helo_response,
3138 &sx->delivery_start);
3145 (void)smtp_write_command(sx, SCMD_FLUSH, "QUIT\r\n");
3148 if (sx->cctx.tls_ctx)
3150 if (sx->send_tlsclose)
3152 tls_close(sx->cctx.tls_ctx, TLS_SHUTDOWN_NOWAIT);
3153 sx->send_tlsclose = FALSE;
3155 sx->cctx.tls_ctx = NULL;
3159 /* Close the socket, and return the appropriate value, first setting
3160 works because the NULL setting is passed back to the calling process, and
3161 remote_max_parallel is forced to 1 when delivering over an existing connection,
3164 HDEBUG(D_transport|D_acl|D_v) debug_printf_indent(" SMTP(close)>>\n");
3167 shutdown(sx->cctx.sock, SHUT_WR);
3168 if (fcntl(sx->cctx.sock, F_SETFL, O_NONBLOCK) == 0)
3169 for (int i = 16; read(sx->cctx.sock, sx->inbuffer, sizeof(sx->inbuffer)) > 0 && i > 0;)
3170 i--; /* drain socket */
3171 sx->send_quit = FALSE;
3173 (void)close(sx->cctx.sock);
3176 #ifndef DISABLE_EVENT
3177 (void) event_raise(sx->conn_args.tblock->event_action, US"tcp:close", NULL);
3180 continue_transport = NULL;
3181 continue_hostname = NULL;
3188 /* Create the string of options that will be appended to the MAIL FROM:
3189 in the connection context buffer */
3192 build_mailcmd_options(smtp_context * sx, address_item * addrlist)
3194 uschar * p = sx->buffer;
3195 address_item * addr;
3200 /* If we know the receiving MTA supports the SIZE qualification, and we know it,
3201 send it, adding something to the message size to allow for imprecision
3202 and things that get added en route. Exim keeps the number of lines
3203 in a message, so we can give an accurate value for the original message, but we
3204 need some additional to handle added headers. (Double "." characters don't get
3205 included in the count.) */
3207 if ( message_size > 0
3208 && sx->peer_offered & OPTION_SIZE && !(sx->avoid_option & OPTION_SIZE))
3210 /*XXX problem here under spool_files_wireformat?
3211 Or just forget about lines? Or inflate by a fixed proportion? */
3213 sprintf(CS p, " SIZE=%d", message_size+message_linecount+(SOB sx->conn_args.ob)->size_addition);
3217 #ifndef DISABLE_PRDR
3218 /* If it supports Per-Recipient Data Responses, and we have more than one recipient,
3221 sx->prdr_active = FALSE;
3222 if (sx->peer_offered & OPTION_PRDR)
3223 for (address_item * addr = addrlist; addr; addr = addr->next)
3224 if (addr->transport_return == PENDING_DEFER)
3226 for (addr = addr->next; addr; addr = addr->next)
3227 if (addr->transport_return == PENDING_DEFER)
3228 { /* at least two recipients to send */
3229 sx->prdr_active = TRUE;
3230 sprintf(CS p, " PRDR"); p += 5;
3238 /* If it supports internationalised messages, and this meesage need that,
3241 if ( sx->peer_offered & OPTION_UTF8
3242 && addrlist->prop.utf8_msg
3243 && !addrlist->prop.utf8_downcvt
3245 Ustrcpy(p, US" SMTPUTF8"), p += 9;
3248 /* check if all addresses have DSN-lasthop flag; do not send RET and ENVID if so */
3249 for (sx->dsn_all_lasthop = TRUE, addr = addrlist, address_count = 0;
3250 addr && address_count < sx->max_rcpt; /*XXX maybe also || sx->single_rcpt_domain ? */
3251 addr = addr->next) if (addr->transport_return == PENDING_DEFER)
3254 if (!(addr->dsn_flags & rf_dsnlasthop))
3256 sx->dsn_all_lasthop = FALSE;
3261 /* Add any DSN flags to the mail command */
3263 if (sx->peer_offered & OPTION_DSN && !sx->dsn_all_lasthop)
3265 if (dsn_ret == dsn_ret_hdrs)
3266 { Ustrcpy(p, US" RET=HDRS"); p += 9; }
3267 else if (dsn_ret == dsn_ret_full)
3268 { Ustrcpy(p, US" RET=FULL"); p += 9; }
3272 string_format(p, sizeof(sx->buffer) - (p-sx->buffer), " ENVID=%s", dsn_envid);
3277 /* If an authenticated_sender override has been specified for this transport
3278 instance, expand it. If the expansion is forced to fail, and there was already
3279 an authenticated_sender for this message, the original value will be used.
3280 Other expansion failures are serious. An empty result is ignored, but there is
3281 otherwise no check - this feature is expected to be used with LMTP and other
3282 cases where non-standard addresses (e.g. without domains) might be required. */
3284 return smtp_mail_auth_str(sx, p, addrlist) ? ERROR : OK;
3289 build_rcptcmd_options(smtp_context * sx, const address_item * addr)
3291 uschar * p = sx->buffer;
3294 /* Add any DSN flags to the rcpt command */
3296 if (sx->peer_offered & OPTION_DSN && !(addr->dsn_flags & rf_dsnlasthop))
3298 if (addr->dsn_flags & rf_dsnflags)
3302 Ustrcpy(p, US" NOTIFY=");
3304 for (int i = 0; i < nelem(rf_list); i++) if (addr->dsn_flags & rf_list[i])
3306 if (!first) *p++ = ',';
3308 Ustrcpy(p, rf_names[i]);
3313 if (addr->dsn_orcpt)
3315 string_format(p, sizeof(sx->buffer) - (p-sx->buffer), " ORCPT=%s",
3326 0 good, rcpt results in addr->transport_return (PENDING_OK, DEFER, FAIL)
3327 -1 MAIL response error
3328 -2 any non-MAIL read i/o error
3329 -3 non-MAIL response timeout
3330 -4 internal error; channel still usable
3335 smtp_write_mail_and_rcpt_cmds(smtp_context * sx, int * yield)
3337 address_item * addr;
3338 #ifdef EXPERIMENTAL_ESMTP_LIMITS
3339 address_item * restart_addr = NULL;
3341 int address_count, pipe_limit;
3344 if (build_mailcmd_options(sx, sx->first_addr) != OK)
3350 /* From here until we send the DATA command, we can make use of PIPELINING
3351 if the server host supports it. The code has to be able to check the responses
3352 at any point, for when the buffer fills up, so we write it totally generally.
3353 When PIPELINING is off, each command written reports that it has flushed the
3356 sx->pending_MAIL = TRUE; /* The block starts with MAIL */
3359 uschar * s = sx->from_addr;
3361 uschar * errstr = NULL;
3363 /* If we must downconvert, do the from-address here. Remember we had to
3364 for the to-addresses (done below), and also (ugly) for re-doing when building
3365 the delivery log line. */
3367 if ( sx->addrlist->prop.utf8_msg
3368 && (sx->addrlist->prop.utf8_downcvt || !(sx->peer_offered & OPTION_UTF8))
3371 if (s = string_address_utf8_to_alabel(s, &errstr), errstr)
3373 set_errno_nohost(sx->addrlist, ERRNO_EXPANDFAIL, errstr, DEFER, FALSE, &sx->delivery_start);
3377 setflag(sx->addrlist, af_utf8_downcvt);
3381 rc = smtp_write_command(sx, pipelining_active ? SCMD_BUFFER : SCMD_FLUSH,
3382 "MAIL FROM:<%s>%s\r\n", s, sx->buffer);
3385 mail_command = string_copy(big_buffer); /* Save for later error message */
3389 case -1: /* Transmission error */
3392 case +1: /* Cmd was sent */
3393 if (!smtp_read_response(sx, sx->buffer, sizeof(sx->buffer), '2',
3394 (SOB sx->conn_args.ob)->command_timeout))
3396 if (errno == 0 && sx->buffer[0] == '4')
3398 errno = ERRNO_MAIL4XX;
3399 sx->addrlist->more_errno |= ((sx->buffer[1] - '0')*10 + sx->buffer[2] - '0') << 8;
3403 sx->pending_MAIL = FALSE;
3406 /* otherwise zero: command queued for pipeline */
3409 /* Pass over all the relevant recipient addresses for this host, which are the
3410 ones that have status PENDING_DEFER. If we are using PIPELINING, we can send
3411 several before we have to read the responses for those seen so far. This
3412 checking is done by a subroutine because it also needs to be done at the end.
3413 Send only up to max_rcpt addresses at a time, leaving next_addr pointing to
3414 the next one if not all are sent.
3416 In the MUA wrapper situation, we want to flush the PIPELINING buffer for the
3417 last address because we want to abort if any recipients have any kind of
3418 problem, temporary or permanent. We know that all recipient addresses will have
3419 the PENDING_DEFER status, because only one attempt is ever made, and we know
3420 that max_rcpt will be large, so all addresses will be done at once.
3422 For verify we flush the pipeline after any (the only) rcpt address. */
3424 for (addr = sx->first_addr, address_count = 0, pipe_limit = 100;
3425 addr && address_count < sx->max_rcpt;
3426 addr = addr->next) if (addr->transport_return == PENDING_DEFER)
3432 #ifdef EXPERIMENTAL_ESMTP_LIMITS
3433 if ( sx->single_rcpt_domain /* restriction on domains */
3434 && address_count > 0 /* not first being sent */
3435 && Ustrcmp(addr->domain, sx->first_addr->domain) != 0 /* dom diff from first */
3438 DEBUG(D_transport) debug_printf("skipping different domain %s\n", addr->domain);
3440 /* Ensure the smtp-response reaper does not think the address had a RCPT
3441 command sent for it. Reset to PENDING_DEFER in smtp_deliver(), where we
3442 goto SEND_MESSAGE. */
3444 addr->transport_return = SKIP;
3445 if (!restart_addr) restart_addr = addr; /* note restart point */
3446 continue; /* skip this one */
3450 addr->dsn_aware = sx->peer_offered & OPTION_DSN
3451 ? dsn_support_yes : dsn_support_no;
3454 if (pipe_limit-- <= 0)
3455 { no_flush = FALSE; pipe_limit = 100; }
3457 no_flush = pipelining_active && !sx->verify
3458 && (!mua_wrapper || addr->next && address_count < sx->max_rcpt);
3460 build_rcptcmd_options(sx, addr);
3462 /* Now send the RCPT command, and process outstanding responses when
3463 necessary. After a timeout on RCPT, we just end the function, leaving the
3464 yield as OK, because this error can often mean that there is a problem with
3465 just one address, so we don't want to delay the host. */
3467 rcpt_addr = transport_rcpt_address(addr, sx->conn_args.tblock->rcpt_include_affixes);
3470 if ( testflag(sx->addrlist, af_utf8_downcvt)
3471 && !(rcpt_addr = string_address_utf8_to_alabel(rcpt_addr, NULL))
3474 /*XXX could we use a per-address errstr here? Not fail the whole send? */
3475 errno = ERRNO_EXPANDFAIL;
3476 return -5; /*XXX too harsh? */
3480 cmds_sent = smtp_write_command(sx, no_flush ? SCMD_BUFFER : SCMD_FLUSH,
3481 "RCPT TO:<%s>%s%s\r\n", rcpt_addr, sx->igquotstr, sx->buffer);
3483 if (cmds_sent < 0) return -5;
3486 switch(sync_responses(sx, cmds_sent, 0))
3488 case 3: sx->ok = TRUE; /* 2xx & 5xx => OK & progress made */
3489 case 2: sx->completed_addr = TRUE; /* 5xx (only) => progress made */
3492 case 1: sx->ok = TRUE; /* 2xx (only) => OK, but if LMTP, */
3493 if (!sx->lmtp) /* can't tell about progress yet */
3494 sx->completed_addr = TRUE;
3495 case 0: /* No 2xx or 5xx, but no probs */
3496 /* If any RCPT got a 452 response then next_addr has been updated
3497 for restarting with a new MAIL on the same connection. Send no more
3498 RCPTs for this MAIL. */
3502 DEBUG(D_transport) debug_printf("seen 452 too-many-rcpts\n");
3503 sx->RCPT_452 = FALSE;
3504 /* sx->next_addr has been reset for fast_retry */
3509 case -1: return -3; /* Timeout on RCPT */
3510 case -2: return -2; /* non-MAIL read i/o error */
3511 default: return -1; /* any MAIL error */
3513 #ifndef DISABLE_PIPE_CONNECT
3514 case -4: return -1; /* non-2xx for pipelined banner or EHLO */
3515 case -5: return -1; /* TLS first-read error */
3519 } /* Loop for next address */
3521 #ifdef EXPERIMENTAL_ESMTP_LIMITS
3522 sx->next_addr = restart_addr ? restart_addr : addr;
3524 sx->next_addr = addr;
3531 /*****************************************************
3532 * Proxy TLS connection for another transport process *
3533 ******************************************************/
3535 Close the unused end of the pipe, fork once more, then use the given buffer
3536 as a staging area, and select on both the given fd and the TLS'd client-fd for
3537 data to read (per the coding in ip_recv() and fd_ready() this is legitimate).
3538 Do blocking full-size writes, and reads under a timeout. Once both input
3539 channels are closed, exit the process.
3543 buf space to use for buffering
3544 bufsiz size of buffer
3545 pfd pipe filedescriptor array; [0] is comms to proxied process
3546 timeout per-read timeout, seconds
3552 smtp_proxy_tls(void * ct_ctx, uschar * buf, size_t bsize, int * pfd,
3556 int max_fd = MAX(pfd[0], tls_out.active.sock) + 1;
3558 BOOL send_tls_shutdown = TRUE;
3561 if ((rc = exim_fork(US"tls-proxy")))
3562 _exit(rc < 0 ? EXIT_FAILURE : EXIT_SUCCESS);
3564 set_process_info("proxying TLS connection for continued transport");
3566 FD_SET(tls_out.active.sock, &rfds);
3567 FD_SET(pfd[0], &rfds);
3569 for (int fd_bits = 3; fd_bits; )
3571 time_t time_left = timeout;
3572 time_t time_start = time(NULL);
3578 struct timeval tv = { time_left, 0 };
3581 (SELECT_ARG2_TYPE *)&rfds, NULL, (SELECT_ARG2_TYPE *)&efds, &tv);
3583 if (rc < 0 && errno == EINTR)
3584 if ((time_left -= time(NULL) - time_start) > 0) continue;
3588 DEBUG(D_transport) if (rc == 0) debug_printf("%s: timed out\n", __FUNCTION__);
3592 /* For errors where not readable, bomb out */
3594 if (FD_ISSET(tls_out.active.sock, &efds) || FD_ISSET(pfd[0], &efds))
3596 DEBUG(D_transport) debug_printf("select: exceptional cond on %s fd\n",
3597 FD_ISSET(pfd[0], &efds) ? "proxy" : "tls");
3598 if (!(FD_ISSET(tls_out.active.sock, &rfds) || FD_ISSET(pfd[0], &rfds)))
3600 DEBUG(D_transport) debug_printf("- but also readable; no exit yet\n");
3603 while (rc < 0 || !(FD_ISSET(tls_out.active.sock, &rfds) || FD_ISSET(pfd[0], &rfds)));
3605 /* handle inbound data */
3606 if (FD_ISSET(tls_out.active.sock, &rfds))
3607 if ((rc = tls_read(ct_ctx, buf, bsize)) <= 0) /* Expect -1 for EOF; */
3608 { /* that reaps the TLS Close Notify record */
3610 FD_CLR(tls_out.active.sock, &rfds);
3611 shutdown(pfd[0], SHUT_WR);
3615 for (int nbytes = 0; rc - nbytes > 0; nbytes += i)
3616 if ((i = write(pfd[0], buf + nbytes, rc - nbytes)) < 0) goto done;
3618 /* Handle outbound data. We cannot combine payload and the TLS-close
3619 due to the limitations of the (pipe) channel feeding us. Maybe use a unix-domain
3621 if (FD_ISSET(pfd[0], &rfds))
3622 if ((rc = read(pfd[0], buf, bsize)) <= 0)
3625 FD_CLR(pfd[0], &rfds);
3627 # ifdef EXIM_TCP_CORK /* Use _CORK to get TLS Close Notify in FIN segment */
3628 (void) setsockopt(tls_out.active.sock, IPPROTO_TCP, EXIM_TCP_CORK, US &on, sizeof(on));
3630 tls_shutdown_wr(ct_ctx);
3631 send_tls_shutdown = FALSE;
3632 shutdown(tls_out.active.sock, SHUT_WR);
3635 for (int nbytes = 0; rc - nbytes > 0; nbytes += i)
3636 if ((i = tls_write(ct_ctx, buf + nbytes, rc - nbytes, FALSE)) < 0)
3639 if (fd_bits & 1) FD_SET(tls_out.active.sock, &rfds);
3640 if (fd_bits & 2) FD_SET(pfd[0], &rfds);
3644 if (send_tls_shutdown) tls_close(ct_ctx, TLS_SHUTDOWN_NOWAIT);
3646 testharness_pause_ms(100); /* let logging complete */
3647 exim_exit(EXIT_SUCCESS);
3652 /*************************************************
3653 * Deliver address list to given host *
3654 *************************************************/
3656 /* If continue_hostname is not null, we get here only when continuing to
3657 deliver down an existing channel. The channel was passed as the standard
3658 input. TLS is never active on a passed channel; the previous process either
3659 closes it down before passing the connection on, or inserts a TLS-proxy
3660 process and passes on a cleartext conection.
3662 Otherwise, we have to make a connection to the remote host, and do the
3663 initial protocol exchange.
3665 When running as an MUA wrapper, if the sender or any recipient is rejected,
3666 temporarily or permanently, we force failure for all recipients.
3669 addrlist chain of potential addresses to deliver; only those whose
3670 transport_return field is set to PENDING_DEFER are currently
3671 being processed; others should be skipped - they have either
3672 been delivered to an earlier host or IP address, or been
3673 failed by one of them.
3674 host host to deliver to
3675 host_af AF_INET or AF_INET6
3676 defport default TCP/IP port to use if host does not specify, in host
3678 interface interface to bind to, or NULL
3679 tblock transport instance block
3680 message_defer set TRUE if yield is OK, but all addresses were deferred
3681 because of a non-recipient, non-host failure, that is, a
3682 4xx response to MAIL FROM, DATA, or ".". This is a defer
3683 that is specific to the message.
3684 suppress_tls if TRUE, don't attempt a TLS connection - this is set for
3685 a second attempt after TLS initialization fails
3687 Returns: OK - the connection was made and the delivery attempted;
3688 the result for each address is in its data block.
3689 DEFER - the connection could not be made, or something failed
3690 while setting up the SMTP session, or there was a
3691 non-message-specific error, such as a timeout.
3692 ERROR - a filter command is specified for this transport,
3693 and there was a problem setting it up; OR helo_data
3694 or add_headers or authenticated_sender is specified
3695 for this transport, and the string failed to expand
3697 For all non-OK returns the first addr of the list carries the
3698 time taken for the attempt.
3702 smtp_deliver(address_item *addrlist, host_item *host, int host_af, int defport,
3703 uschar *interface, transport_instance *tblock,
3704 BOOL *message_defer, BOOL suppress_tls)
3706 smtp_transport_options_block * ob = SOB tblock->options_block;
3711 uschar *message = NULL;
3712 uschar new_message_id[MESSAGE_ID_LENGTH + 1];
3713 smtp_context * sx = store_get(sizeof(*sx), TRUE); /* tainted, for the data buffers */
3714 BOOL pass_message = FALSE;
3715 #ifdef EXPERIMENTAL_ESMTP_LIMITS
3716 BOOL mail_limit = FALSE;
3721 BOOL tcw_done = FALSE, tcw = FALSE;
3723 *message_defer = FALSE;
3725 memset(sx, 0, sizeof(*sx));
3726 sx->addrlist = addrlist;
3727 sx->conn_args.host = host;
3728 sx->conn_args.host_af = host_af,
3730 sx->conn_args.interface = interface;
3731 sx->helo_data = NULL;
3732 sx->conn_args.tblock = tblock;
3733 /* sx->verify = FALSE; */
3734 gettimeofday(&sx->delivery_start, NULL);
3735 sx->sync_addr = sx->first_addr = addrlist;
3742 /* Get the channel set up ready for a message, MAIL FROM being the next
3743 SMTP command to send. */
3745 if ((rc = smtp_setup_conn(sx, suppress_tls)) != OK)
3747 timesince(&addrlist->delivery_time, &sx->delivery_start);
3753 /* If the connection used DANE, ignore for now any addresses with incompatible
3754 domains. The SNI has to be the domain. Arrange a whole new TCP conn later,
3755 just in case only TLS isn't enough. */
3757 if (sx->conn_args.dane)
3759 const uschar * dane_domain = sx->first_addr->domain;
3761 for (address_item * a = sx->first_addr->next; a; a = a->next)
3762 if ( a->transport_return == PENDING_DEFER
3763 && Ustrcmp(dane_domain, a->domain) != 0)
3765 DEBUG(D_transport) debug_printf("DANE: holding %s for later\n", a->domain);
3767 a->transport_return = DANE;
3772 /* If there is a filter command specified for this transport, we can now
3773 set it up. This cannot be done until the identity of the host is known. */
3775 if (tblock->filter_command)
3777 transport_filter_timeout = tblock->filter_timeout;
3779 /* On failure, copy the error to all addresses, abandon the SMTP call, and
3782 if (!transport_set_up_command(&transport_filter_argv,
3783 tblock->filter_command, TRUE, DEFER, addrlist,
3784 string_sprintf("%.50s transport", tblock->name), NULL))
3786 set_errno_nohost(addrlist->next, addrlist->basic_errno, addrlist->message, DEFER,
3787 FALSE, &sx->delivery_start);
3792 if ( transport_filter_argv
3793 && *transport_filter_argv
3794 && **transport_filter_argv
3795 && sx->peer_offered & OPTION_CHUNKING
3796 #ifndef DISABLE_DKIM
3797 /* When dkim signing, chunking is handled even with a transport-filter */
3798 && !(ob->dkim.dkim_private_key && ob->dkim.dkim_domain && ob->dkim.dkim_selector)
3799 && !ob->dkim.force_bodyhash
3803 sx->peer_offered &= ~OPTION_CHUNKING;
3804 DEBUG(D_transport) debug_printf("CHUNKING not usable due to transport filter\n");
3808 /* For messages that have more than the maximum number of envelope recipients,
3809 we want to send several transactions down the same SMTP connection. (See
3810 comments in deliver.c as to how this reconciles, heuristically, with
3811 remote_max_parallel.) This optimization was added to Exim after the following
3812 code was already working. The simplest way to put it in without disturbing the
3813 code was to use a goto to jump back to this point when there is another
3814 transaction to handle. */
3817 sx->from_addr = return_path;
3818 sx->sync_addr = sx->first_addr;
3820 sx->send_rset = TRUE;
3821 sx->completed_addr = FALSE;
3824 /* If we are a continued-connection-after-verify the MAIL and RCPT
3825 commands were already sent; do not re-send but do mark the addrs as
3826 having been accepted up to RCPT stage. A traditional cont-conn
3827 always has a sequence number greater than one. */
3829 if (continue_hostname && continue_sequence == 1)
3831 /* sx->pending_MAIL = FALSE; */
3833 /* sx->next_addr = NULL; */
3835 for (address_item * addr = addrlist; addr; addr = addr->next)
3836 addr->transport_return = PENDING_OK;
3840 /* Initiate a message transfer. */
3842 switch(smtp_write_mail_and_rcpt_cmds(sx, &yield))
3845 case -1: case -2: goto RESPONSE_FAILED;
3846 case -3: goto END_OFF;
3847 case -4: goto SEND_QUIT;
3848 default: goto SEND_FAILED;
3851 /* If we are an MUA wrapper, abort if any RCPTs were rejected, either
3852 permanently or temporarily. We should have flushed and synced after the last
3860 for (a = sx->first_addr, cnt = 0; a && cnt < sx->max_rcpt; a = a->next, cnt++)
3861 if (a->transport_return != PENDING_OK)
3863 /*XXX could we find a better errno than 0 here? */
3864 set_errno_nohost(addrlist, 0, a->message, FAIL,
3865 testflag(a, af_pass_message), &sx->delivery_start);
3872 /* If ok is TRUE, we know we have got at least one good recipient, and must now
3873 send DATA, but if it is FALSE (in the normal, non-wrapper case), we may still
3874 have a good recipient buffered up if we are pipelining. We don't want to waste
3875 time sending DATA needlessly, so we only send it if either ok is TRUE or if we
3876 are pipelining. The responses are all handled by sync_responses().
3877 If using CHUNKING, do not send a BDAT until we know how big a chunk we want
3880 if ( !(sx->peer_offered & OPTION_CHUNKING)
3881 && (sx->ok || (pipelining_active && !mua_wrapper)))
3883 int count = smtp_write_command(sx, SCMD_FLUSH, "DATA\r\n");
3885 if (count < 0) goto SEND_FAILED;
3886 switch(sync_responses(sx, count, sx->ok ? +1 : -1))
3888 case 3: sx->ok = TRUE; /* 2xx & 5xx => OK & progress made */
3889 case 2: sx->completed_addr = TRUE; /* 5xx (only) => progress made */
3892 case 1: sx->ok = TRUE; /* 2xx (only) => OK, but if LMTP, */
3893 if (!sx->lmtp) sx->completed_addr = TRUE; /* can't tell about progress yet */
3894 case 0: break; /* No 2xx or 5xx, but no probs */
3896 case -1: goto END_OFF; /* Timeout on RCPT */
3898 #ifndef DISABLE_PIPE_CONNECT
3899 case -5: /* TLS first-read error */
3900 case -4: HDEBUG(D_transport)
3901 debug_printf("failed reaping pipelined cmd responses\n");
3903 default: goto RESPONSE_FAILED; /* I/O error, or any MAIL/DATA error */
3905 pipelining_active = FALSE;
3906 data_command = string_copy(big_buffer); /* Save for later error message */
3909 /* If there were no good recipients (but otherwise there have been no
3910 problems), just set ok TRUE, since we have handled address-specific errors
3911 already. Otherwise, it's OK to send the message. Use the check/escape mechanism
3912 for handling the SMTP dot-handling protocol, flagging to apply to headers as
3913 well as body. Set the appropriate timeout value to be used for each chunk.
3914 (Haven't been able to make it work using select() for writing yet.) */
3917 && (!(sx->peer_offered & OPTION_CHUNKING) || !pipelining_active))
3919 /* Save the first address of the next batch. */
3920 sx->first_addr = sx->next_addr;
3926 transport_ctx tctx = {
3927 .u = {.fd = sx->cctx.sock}, /*XXX will this need TLS info? */
3930 .check_string = US".",
3931 .escape_string = US"..", /* Escaping strings */
3933 topt_use_crlf | topt_escape_headers
3934 | (tblock->body_only ? topt_no_headers : 0)
3935 | (tblock->headers_only ? topt_no_body : 0)
3936 | (tblock->return_path_add ? topt_add_return_path : 0)
3937 | (tblock->delivery_date_add ? topt_add_delivery_date : 0)
3938 | (tblock->envelope_to_add ? topt_add_envelope_to : 0)
3941 /* If using CHUNKING we need a callback from the generic transport
3942 support to us, for the sending of BDAT smtp commands and the reaping
3943 of responses. The callback needs a whole bunch of state so set up
3944 a transport-context structure to be passed around. */
3946 if (sx->peer_offered & OPTION_CHUNKING)
3948 tctx.check_string = tctx.escape_string = NULL;
3949 tctx.options |= topt_use_bdat;
3950 tctx.chunk_cb = smtp_chunk_cmd_callback;
3951 sx->pending_BDAT = FALSE;
3952 sx->good_RCPT = sx->ok;
3954 tctx.smtp_context = sx;
3957 tctx.options |= topt_end_dot;
3959 /* Save the first address of the next batch. */
3960 sx->first_addr = sx->next_addr;
3962 /* Responses from CHUNKING commands go in buffer. Otherwise,
3963 there has not been a response. */
3967 sigalrm_seen = FALSE;
3968 transport_write_timeout = ob->data_timeout;
3969 smtp_command = US"sending data block"; /* For error messages */
3970 DEBUG(D_transport|D_v)
3971 if (sx->peer_offered & OPTION_CHUNKING)
3972 debug_printf(" will write message using CHUNKING\n");
3974 debug_printf(" SMTP>> writing message and terminating \".\"\n");
3975 transport_count = 0;
3977 #ifndef DISABLE_DKIM
3979 # ifdef MEASURE_TIMING
3981 gettimeofday(&t0, NULL);
3983 dkim_exim_sign_init();
3984 # ifdef EXPERIMENTAL_ARC
3986 uschar * s = ob->arc_sign;
3989 if (!(ob->dkim.arc_signspec = s = expand_string(s)))
3991 if (!f.expand_string_forcedfail)
3993 message = US"failed to expand arc_sign";
4000 /* Ask dkim code to hash the body for ARC */
4001 (void) arc_ams_setup_sign_bodyhash();
4002 ob->dkim.force_bodyhash = TRUE;
4007 # ifdef MEASURE_TIMING
4008 report_time_since(&t0, US"dkim_exim_sign_init (delta)");
4013 /* See if we can pipeline QUIT. Reasons not to are
4014 - pipelining not active
4015 - not ok to send quit
4016 - errors in amtp transation responses
4017 - more addrs to send for this message or this host
4018 - this message was being retried
4019 - more messages for this host
4020 If we can, we want the message-write to not flush (the tail end of) its data out. */
4022 if ( sx->pipelining_used
4023 && (sx->ok && sx->completed_addr || sx->peer_offered & OPTION_CHUNKING)
4025 && !(sx->first_addr || f.continue_more)
4026 && f.deliver_firsttime
4029 smtp_compare_t t_compare =
4030 {.tblock = tblock, .current_sender_address = sender_address};
4035 ( tls_out.active.sock < 0 && !continue_proxy_cipher
4036 || verify_check_given_host(CUSS &ob->hosts_nopass_tls, host) != OK
4040 transport_check_waiting(tblock->name, host->name,
4041 tblock->connection_max_messages, new_message_id,
4042 (oicf)smtp_are_same_identities, (void*)&t_compare);
4045 HDEBUG(D_transport) debug_printf("will pipeline QUIT\n");
4046 tctx.options |= topt_no_flush;
4050 #ifndef DISABLE_DKIM
4051 sx->ok = dkim_transport_write_message(&tctx, &ob->dkim, CUSS &message);
4053 sx->ok = transport_write_message(&tctx, 0);
4056 /* transport_write_message() uses write() because it is called from other
4057 places to write to non-sockets. This means that under some OS (e.g. Solaris)
4058 it can exit with "Broken pipe" as its error. This really means that the
4059 socket got closed at the far end. */
4061 transport_write_timeout = 0; /* for subsequent transports */
4063 /* Failure can either be some kind of I/O disaster (including timeout),
4064 or the failure of a transport filter or the expansion of added headers.
4065 Or, when CHUNKING, it can be a protocol-detected failure. */
4068 if (message) goto SEND_FAILED;
4069 else goto RESPONSE_FAILED;
4071 /* We used to send the terminating "." explicitly here, but because of
4072 buffering effects at both ends of TCP/IP connections, you don't gain
4073 anything by keeping it separate, so it might as well go in the final
4074 data buffer for efficiency. This is now done by setting the topt_end_dot
4077 smtp_command = US"end of data";
4079 /* If we can pipeline a QUIT with the data them send it now. If a new message
4080 for this host appeared in the queue while data was being sent, we will not see
4081 it and it will have to wait for a queue run. If there was one but another
4082 thread took it, we might attempt to send it - but locking of spoolfiles will
4083 detect that. Use _MORE to get QUIT in FIN segment. */
4085 if (tcw_done && !tcw)
4087 /*XXX jgh 2021/03/10 google et. al screwup. G, at least, sends TCP FIN in response to TLS
4088 close-notify. Under TLS 1.3, violating RFC.
4089 However, TLS 1.2 does not have half-close semantics. */
4091 if ( sx->cctx.tls_ctx
4092 #if 0 && !defined(DISABLE_TLS)
4093 && Ustrcmp(tls_out.ver, "TLS1.3") != 0
4095 || !f.deliver_firsttime
4097 { /* Send QUIT now and not later */
4098 (void)smtp_write_command(sx, SCMD_FLUSH, "QUIT\r\n");
4099 sx->send_quit = FALSE;
4102 { /* add QUIT to the output buffer */
4103 (void)smtp_write_command(sx, SCMD_MORE, "QUIT\r\n");
4104 sx->send_quit = FALSE; /* avoid sending it later */
4107 if (sx->cctx.tls_ctx) /* need to send TLS Close Notify */
4109 # ifdef EXIM_TCP_CORK /* Use _CORK to get Close Notify in FIN segment */
4110 (void) setsockopt(sx->cctx.sock, IPPROTO_TCP, EXIM_TCP_CORK, US &on, sizeof(on));
4112 tls_shutdown_wr(sx->cctx.tls_ctx);
4113 sx->send_tlsclose = FALSE; /* avoid later repeat */
4116 HDEBUG(D_transport|D_acl|D_v) debug_printf_indent(" SMTP(shutdown)>>\n");
4117 shutdown(sx->cctx.sock, SHUT_WR); /* flush output buffer, with TCP FIN */
4121 if (sx->peer_offered & OPTION_CHUNKING && sx->cmd_count > 1)
4123 /* Reap any outstanding MAIL & RCPT commands, but not a DATA-go-ahead */
4124 switch(sync_responses(sx, sx->cmd_count-1, 0))
4126 case 3: sx->ok = TRUE; /* 2xx & 5xx => OK & progress made */
4127 case 2: sx->completed_addr = TRUE; /* 5xx (only) => progress made */
4130 case 1: sx->ok = TRUE; /* 2xx (only) => OK, but if LMTP, */
4131 if (!sx->lmtp) sx->completed_addr = TRUE; /* can't tell about progress yet */
4132 case 0: break; /* No 2xx or 5xx, but no probs */
4134 case -1: goto END_OFF; /* Timeout on RCPT */
4136 #ifndef DISABLE_PIPE_CONNECT
4137 case -5: /* TLS first-read error */
4138 case -4: HDEBUG(D_transport)
4139 debug_printf("failed reaping pipelined cmd responses\n");
4141 default: goto RESPONSE_FAILED; /* I/O error, or any MAIL/DATA error */
4145 #ifndef DISABLE_PRDR
4146 /* For PRDR we optionally get a partial-responses warning followed by the
4147 individual responses, before going on with the overall response. If we don't
4148 get the warning then deal with per non-PRDR. */
4152 sx->ok = smtp_read_response(sx, sx->buffer, sizeof(sx->buffer), '3', ob->final_timeout);
4153 if (!sx->ok && errno == 0) switch(sx->buffer[0])
4155 case '2': sx->prdr_active = FALSE;
4158 case '4': errno = ERRNO_DATA4XX;
4159 addrlist->more_errno |=
4160 ((sx->buffer[1] - '0')*10 + sx->buffer[2] - '0') << 8;
4167 /* For non-PRDR SMTP, we now read a single response that applies to the
4168 whole message. If it is OK, then all the addresses have been delivered. */
4172 sx->ok = smtp_read_response(sx, sx->buffer, sizeof(sx->buffer), '2',
4174 if (!sx->ok && errno == 0 && sx->buffer[0] == '4')
4176 errno = ERRNO_DATA4XX;
4177 addrlist->more_errno |= ((sx->buffer[1] - '0')*10 + sx->buffer[2] - '0') << 8;
4181 /* For LMTP, we get back a response for every RCPT command that we sent;
4182 some may be accepted and some rejected. For those that get a response, their
4183 status is fixed; any that are accepted have been handed over, even if later
4184 responses crash - at least, that's how I read RFC 2033.
4186 If all went well, mark the recipient addresses as completed, record which
4187 host/IPaddress they were delivered to, and cut out RSET when sending another
4188 message down the same channel. Write the completed addresses to the journal
4189 now so that they are recorded in case there is a crash of hardware or
4190 software before the spool gets updated. Also record the final SMTP
4191 confirmation if needed (for SMTP only). */
4196 struct timeval delivery_time;
4198 uschar * conf = NULL;
4200 timesince(&delivery_time, &sx->delivery_start);
4201 sx->send_rset = FALSE;
4202 pipelining_active = FALSE;
4204 /* Set up confirmation if needed - applies only to SMTP */
4207 #ifdef DISABLE_EVENT
4208 LOGGING(smtp_confirmation) &&
4213 const uschar * s = string_printing(sx->buffer);
4214 /* deconst cast ok here as string_printing was checked to have alloc'n'copied */
4215 conf = s == sx->buffer ? US string_copy(s) : US s;
4218 /* Process all transported addresses - for LMTP or PRDR, read a status for
4219 each one. We used to drop out at first_addr, until someone returned a 452
4220 followed by a 250... and we screwed up the accepted addresses. */
4222 for (address_item * addr = addrlist; addr; addr = addr->next)
4224 if (addr->transport_return != PENDING_OK) continue;
4226 /* LMTP - if the response fails badly (e.g. timeout), use it for all the
4227 remaining addresses. Otherwise, it's a return code for just the one
4228 address. For temporary errors, add a retry item for the address so that
4229 it doesn't get tried again too soon. */
4231 #ifndef DISABLE_PRDR
4232 if (sx->lmtp || sx->prdr_active)
4237 if (!smtp_read_response(sx, sx->buffer, sizeof(sx->buffer), '2',
4240 if (errno != 0 || sx->buffer[0] == 0) goto RESPONSE_FAILED;
4241 addr->message = string_sprintf(
4242 #ifndef DISABLE_PRDR
4243 "%s error after %s: %s", sx->prdr_active ? "PRDR":"LMTP",
4245 "LMTP error after %s: %s",
4247 data_command, string_printing(sx->buffer));
4248 setflag(addr, af_pass_message); /* Allow message to go to user */
4249 if (sx->buffer[0] == '5')
4250 addr->transport_return = FAIL;
4253 errno = ERRNO_DATA4XX;
4254 addr->more_errno |= ((sx->buffer[1] - '0')*10 + sx->buffer[2] - '0') << 8;
4255 addr->transport_return = DEFER;
4256 #ifndef DISABLE_PRDR
4257 if (!sx->prdr_active)
4259 retry_add_item(addr, addr->address_retry_key, 0);
4263 sx->completed_addr = TRUE; /* NOW we can set this flag */
4264 if (LOGGING(smtp_confirmation))
4266 const uschar *s = string_printing(sx->buffer);
4267 /* deconst cast ok here as string_printing was checked to have alloc'n'copied */
4268 conf = (s == sx->buffer) ? US string_copy(s) : US s;
4272 /* SMTP, or success return from LMTP for this address. Pass back the
4273 actual host that was used. */
4275 addr->transport_return = OK;
4276 addr->host_used = host;
4277 addr->delivery_time = delivery_time;
4278 addr->special_action = flag;
4279 addr->message = conf;
4281 if (tcp_out_fastopen)
4283 setflag(addr, af_tcp_fastopen_conn);
4284 if (tcp_out_fastopen >= TFO_USED_NODATA) setflag(addr, af_tcp_fastopen);
4285 if (tcp_out_fastopen >= TFO_USED_DATA) setflag(addr, af_tcp_fastopen_data);
4287 if (sx->pipelining_used) setflag(addr, af_pipelining);
4288 #ifndef DISABLE_PIPE_CONNECT
4289 if (sx->early_pipe_active) setflag(addr, af_early_pipe);
4291 #ifndef DISABLE_PRDR
4292 if (sx->prdr_active) setflag(addr, af_prdr_used);
4294 if (sx->peer_offered & OPTION_CHUNKING) setflag(addr, af_chunking_used);
4297 #ifndef DISABLE_PRDR
4298 if (!sx->prdr_active)
4301 /* Update the journal. For homonymic addresses, use the base address plus
4302 the transport name. See lots of comments in deliver.c about the reasons
4303 for the complications when homonyms are involved. Just carry on after
4304 write error, as it may prove possible to update the spool file later. */
4306 if (testflag(addr, af_homonym))
4307 sprintf(CS sx->buffer, "%.500s/%s\n", addr->unique + 3, tblock->name);
4309 sprintf(CS sx->buffer, "%.500s\n", addr->unique);
4311 DEBUG(D_deliver) debug_printf("S:journalling %s", sx->buffer);
4312 len = Ustrlen(CS sx->buffer);
4313 if (write(journal_fd, sx->buffer, len) != len)
4314 log_write(0, LOG_MAIN|LOG_PANIC, "failed to write journal for "
4315 "%s: %s", sx->buffer, strerror(errno));
4319 #ifndef DISABLE_PRDR
4320 if (sx->prdr_active)
4322 const uschar * overall_message;
4324 /* PRDR - get the final, overall response. For any non-success
4325 upgrade all the address statuses. */
4327 sx->ok = smtp_read_response(sx, sx->buffer, sizeof(sx->buffer), '2',
4331 if(errno == 0 && sx->buffer[0] == '4')
4333 errno = ERRNO_DATA4XX;
4334 addrlist->more_errno |= ((sx->buffer[1] - '0')*10 + sx->buffer[2] - '0') << 8;
4336 for (address_item * addr = addrlist; addr != sx->first_addr; addr = addr->next)
4337 if (sx->buffer[0] == '5' || addr->transport_return == OK)
4338 addr->transport_return = PENDING_OK; /* allow set_errno action */
4339 goto RESPONSE_FAILED;
4342 /* Append the overall response to the individual PRDR response for logging
4343 and update the journal, or setup retry. */
4345 overall_message = string_printing(sx->buffer);
4346 for (address_item * addr = addrlist; addr != sx->first_addr; addr = addr->next)
4347 if (addr->transport_return == OK)
4348 addr->message = string_sprintf("%s\\n%s", addr->message, overall_message);
4350 for (address_item * addr = addrlist; addr != sx->first_addr; addr = addr->next)
4351 if (addr->transport_return == OK)
4353 if (testflag(addr, af_homonym))
4354 sprintf(CS sx->buffer, "%.500s/%s\n", addr->unique + 3, tblock->name);
4356 sprintf(CS sx->buffer, "%.500s\n", addr->unique);
4358 DEBUG(D_deliver) debug_printf("journalling(PRDR) %s\n", sx->buffer);
4359 len = Ustrlen(CS sx->buffer);
4360 if (write(journal_fd, sx->buffer, len) != len)
4361 log_write(0, LOG_MAIN|LOG_PANIC, "failed to write journal for "
4362 "%s: %s", sx->buffer, strerror(errno));
4364 else if (addr->transport_return == DEFER)
4365 retry_add_item(addr, addr->address_retry_key, -2);
4369 /* Ensure the journal file is pushed out to disk. */
4371 if (EXIMfsync(journal_fd) < 0)
4372 log_write(0, LOG_MAIN|LOG_PANIC, "failed to fsync journal: %s",
4378 /* Handle general (not specific to one address) failures here. The value of ok
4379 is used to skip over this code on the falling through case. A timeout causes a
4380 deferral. Other errors may defer or fail according to the response code, and
4381 may set up a special errno value, e.g. after connection chopped, which is
4382 assumed if errno == 0 and there is no text in the buffer. If control reaches
4383 here during the setting up phase (i.e. before MAIL FROM) then always defer, as
4384 the problem is not related to this specific message. */
4389 uschar * set_message;
4395 /* Clear send_quit flag if needed. Do not set. */
4396 sx->send_quit &= check_response(host, &save_errno, addrlist->more_errno,
4397 sx->buffer, &code, &message, &pass_message);
4405 message = string_sprintf("send() to %s [%s] failed: %s",
4406 host->name, host->address, message ? message : US strerror(save_errno));
4407 sx->send_quit = FALSE;
4415 sx->ok = FALSE; /* For when reached by GOTO */
4416 set_message = message;
4418 /* We want to handle timeouts after MAIL or "." and loss of connection after
4419 "." specially. They can indicate a problem with the sender address or with
4420 the contents of the message rather than a real error on the connection. These
4421 cases are treated in the same way as a 4xx response. This next bit of code
4422 does the classification. */
4429 message_error = TRUE;
4433 message_error = Ustrncmp(smtp_command,"MAIL",4) == 0 ||
4434 Ustrncmp(smtp_command,"end ",4) == 0;
4437 case ERRNO_SMTPCLOSED:
4438 message_error = Ustrncmp(smtp_command,"end ",4) == 0;
4442 message_error = FALSE;
4446 /* Handle the cases that are treated as message errors. These are:
4448 (a) negative response or timeout after MAIL
4449 (b) negative response after DATA
4450 (c) negative response or timeout or dropped connection after "."
4451 (d) utf8 support required and not offered
4453 It won't be a negative response or timeout after RCPT, as that is dealt
4454 with separately above. The action in all cases is to set an appropriate
4455 error code for all the addresses, but to leave yield set to OK because the
4456 host itself has not failed. Of course, it might in practice have failed
4457 when we've had a timeout, but if so, we'll discover that at the next
4458 delivery attempt. For a temporary error, set the message_defer flag, and
4459 write to the logs for information if this is not the last host. The error
4460 for the last host will be logged as part of the address's log line. */
4464 if (mua_wrapper) code = '5'; /* Force hard failure in wrapper mode */
4466 /* If there's an errno, the message contains just the identity of
4471 else /* Anything other than 5 is treated as temporary */
4475 message = US string_sprintf("%s: %s", message, strerror(save_errno));
4477 write_logs(host, message, sx->first_addr ? sx->first_addr->basic_errno : 0);
4479 *message_defer = TRUE;
4482 DEBUG(D_transport) if (sx->cctx.sock >= 0)
4485 if (ioctl(sx->cctx.sock, TIOCOUTQ, &n) == 0)
4486 debug_printf("%d bytes remain in socket output buffer\n", n);
4490 /* Otherwise, we have an I/O error or a timeout other than after MAIL or
4491 ".", or some other transportation error. We defer all addresses and yield
4492 DEFER, except for the case of failed add_headers expansion, or a transport
4493 filter failure, when the yield should be ERROR, to stop it trying other
4498 #ifndef DISABLE_PIPE_CONNECT
4499 /* If we were early-pipelinng and the actual EHLO response did not match
4500 the cached value we assumed, we could have detected it and passed a
4501 custom errno through to here. It would be nice to RSET and retry right
4502 away, but to reliably do that we eould need an extra synch point before
4503 we committed to data and that would discard half the gained roundrips.
4504 Or we could summarily drop the TCP connection. but that is also ugly.
4505 Instead, we ignore the possibility (having freshened the cache) and rely
4506 on the server telling us with a nonmessage error if we have tried to
4507 do something it no longer supports. */
4510 yield = (save_errno == ERRNO_CHHEADER_FAIL ||
4511 save_errno == ERRNO_FILTER_FAIL) ? ERROR : DEFER;
4515 set_errno(addrlist, save_errno, set_message, set_rc, pass_message, host,
4516 #ifdef EXPERIMENTAL_DSN_INFO
4517 sx->smtp_greeting, sx->helo_response,
4519 &sx->delivery_start);
4522 /* If all has gone well, send_quit will be set TRUE, implying we can end the
4523 SMTP session tidily. However, if there were too many addresses to send in one
4524 message (indicated by first_addr being non-NULL) we want to carry on with the
4525 rest of them. Also, it is desirable to send more than one message down the SMTP
4526 connection if there are several waiting, provided we haven't already sent so
4527 many as to hit the configured limit. The function transport_check_waiting looks
4528 for a waiting message and returns its id. Then transport_pass_socket tries to
4529 set up a continued delivery by passing the socket on to another process. The
4530 variable send_rset is FALSE if a message has just been successfully transferred.
4532 If we are already sending down a continued channel, there may be further
4533 addresses not yet delivered that are aimed at the same host, but which have not
4534 been passed in this run of the transport. In this case, continue_more will be
4535 true, and all we should do is send RSET if necessary, and return, leaving the
4538 However, if no address was disposed of, i.e. all addresses got 4xx errors, we
4539 do not want to continue with other messages down the same channel, because that
4540 can lead to looping between two or more messages, all with the same,
4541 temporarily failing address(es). [The retry information isn't updated yet, so
4542 new processes keep on trying.] We probably also don't want to try more of this
4543 message's addresses either.
4545 If we have started a TLS session, we have to end it before passing the
4546 connection to a new process. However, not all servers can handle this (Exim
4547 can), so we do not pass such a connection on if the host matches
4548 hosts_nopass_tls. */
4551 debug_printf("ok=%d send_quit=%d send_rset=%d continue_more=%d "
4552 "yield=%d first_address is %sNULL\n", sx->ok, sx->send_quit,
4553 sx->send_rset, f.continue_more, yield, sx->first_addr ? "not " : "");
4555 if (sx->completed_addr && sx->ok && sx->send_quit)
4556 #ifdef EXPERIMENTAL_ESMTP_LIMITS
4557 if (mail_limit = continue_sequence >= sx->max_mail)
4560 debug_printf("reached limit %u for MAILs per conn\n", sx->max_mail);
4565 smtp_compare_t t_compare =
4566 {.tblock = tblock, .current_sender_address = sender_address};
4568 if ( sx->first_addr /* more addrs for this message */
4569 || f.continue_more /* more addrs for continued-host */
4570 || tcw_done && tcw /* more messages for host */
4573 ( tls_out.active.sock < 0 && !continue_proxy_cipher
4574 || verify_check_given_host(CUSS &ob->hosts_nopass_tls, host) != OK
4578 transport_check_waiting(tblock->name, host->name,
4579 sx->max_mail, new_message_id,
4580 (oicf)smtp_are_same_identities, (void*)&t_compare)
4587 if (! (sx->ok = smtp_write_command(sx, SCMD_FLUSH, "RSET\r\n") >= 0))
4589 msg = US string_sprintf("send() to %s [%s] failed: %s", host->name,
4590 host->address, strerror(errno));
4591 sx->send_quit = FALSE;
4593 else if (! (sx->ok = smtp_read_response(sx, sx->buffer, sizeof(sx->buffer),
4594 '2', ob->command_timeout)))
4597 sx->send_quit = check_response(host, &errno, 0, sx->buffer, &code, &msg,
4601 DEBUG(D_transport) debug_printf("H=%s [%s] %s\n",
4602 host->name, host->address, msg);
4606 /* Either RSET was not needed, or it succeeded */
4613 int socket_fd = sx->cctx.sock;
4615 if (sx->first_addr) /* More addresses still to be sent */
4616 { /* for this message */
4617 #ifdef EXPERIMENTAL_ESMTP_LIMITS
4618 /* Any that we marked as skipped, reset to do now */
4619 for (address_item * a = sx->first_addr; a; a = a->next)
4620 if (a->transport_return == SKIP)
4621 a->transport_return = PENDING_DEFER;
4623 continue_sequence++; /* for consistency */
4624 clearflag(sx->first_addr, af_new_conn);
4625 setflag(sx->first_addr, af_cont_conn); /* Causes * in logging */
4626 pipelining_active = sx->pipelining_used; /* was cleared at DATA */
4630 /* Unless caller said it already has more messages listed for this host,
4631 pass the connection on to a new Exim process (below, the call to
4632 transport_pass_socket). If the caller has more ready, just return with
4633 the connection still open. */
4636 if (tls_out.active.sock >= 0)
4637 if ( f.continue_more
4638 || verify_check_given_host(CUSS &ob->hosts_noproxy_tls, host) == OK)
4640 /* Before passing the socket on, or returning to caller with it still
4641 open, we must shut down TLS. Not all MTAs allow for the continuation
4642 of the SMTP session when TLS is shut down. We test for this by sending
4643 a new EHLO. If we don't get a good response, we don't attempt to pass
4646 tls_close(sx->cctx.tls_ctx, TLS_SHUTDOWN_WAIT);
4647 sx->send_tlsclose = FALSE;
4648 sx->cctx.tls_ctx = NULL;
4649 tls_out.active.sock = -1;
4650 smtp_peer_options = smtp_peer_options_wrap;
4652 && smtp_write_command(sx, SCMD_FLUSH, "EHLO %s\r\n", sx->helo_data)
4654 && smtp_read_response(sx, sx->buffer, sizeof(sx->buffer),
4655 '2', ob->command_timeout);
4657 if (sx->ok && f.continue_more)
4658 goto TIDYUP; /* More addresses for another run */
4662 /* Set up a pipe for proxying TLS for the new transport process */
4664 smtp_peer_options |= OPTION_TLS;
4665 if ((sx->ok = socketpair(AF_UNIX, SOCK_STREAM, 0, pfd) == 0))
4668 set_errno(sx->first_addr, errno, US"internal allocation problem",
4670 # ifdef EXPERIMENTAL_DSN_INFO
4671 sx->smtp_greeting, sx->helo_response,
4673 &sx->delivery_start);
4677 if (f.continue_more)
4678 goto TIDYUP; /* More addresses for another run */
4680 /* If the socket is successfully passed, we mustn't send QUIT (or
4681 indeed anything!) from here. */
4683 /*XXX DSN_INFO: assume likely to do new HELO; but for greet we'll want to
4684 propagate it from the initial
4686 if (sx->ok && transport_pass_socket(tblock->name, host->name,
4687 host->address, new_message_id, socket_fd
4688 #ifdef EXPERIMENTAL_ESMTP_LIMITS
4689 , sx->peer_limit_mail, sx->peer_limit_rcpt, sx->peer_limit_rcptdom
4693 sx->send_quit = FALSE;
4695 /* We have passed the client socket to a fresh transport process.
4696 If TLS is still active, we need to proxy it for the transport we
4697 just passed the baton to. Fork a child to to do it, and return to
4698 get logging done asap. Which way to place the work makes assumptions
4699 about post-fork prioritisation which may not hold on all platforms. */
4701 if (tls_out.active.sock >= 0)
4703 int pid = exim_fork(US"tls-proxy-interproc");
4704 if (pid == 0) /* child; fork again to disconnect totally */
4706 /* does not return */
4707 smtp_proxy_tls(sx->cctx.tls_ctx, sx->buffer, sizeof(sx->buffer), pfd,
4708 ob->command_timeout);
4711 if (pid > 0) /* parent */
4714 /* tidy the inter-proc to disconn the proxy proc */
4715 waitpid(pid, NULL, 0);
4716 tls_close(sx->cctx.tls_ctx, TLS_NO_SHUTDOWN);
4717 sx->cctx.tls_ctx = NULL;
4718 (void)close(sx->cctx.sock);
4720 continue_transport = NULL;
4721 continue_hostname = NULL;
4724 log_write(0, LOG_PANIC_DIE, "fork failed");
4730 /* If RSET failed and there are addresses left, they get deferred. */
4732 set_errno(sx->first_addr, errno, msg, DEFER, FALSE, host,
4733 #ifdef EXPERIMENTAL_DSN_INFO
4734 sx->smtp_greeting, sx->helo_response,
4736 &sx->delivery_start);
4740 /* End off tidily with QUIT unless the connection has died or the socket has
4741 been passed to another process. */
4745 { /* Use _MORE to get QUIT in FIN segment */
4746 (void)smtp_write_command(sx, SCMD_MORE, "QUIT\r\n");
4748 if (sx->cctx.tls_ctx)
4750 # ifdef EXIM_TCP_CORK /* Use _CORK to get TLS Close Notify in FIN segment */
4751 (void) setsockopt(sx->cctx.sock, IPPROTO_TCP, EXIM_TCP_CORK, US &on, sizeof(on));
4753 tls_shutdown_wr(sx->cctx.tls_ctx);
4754 sx->send_tlsclose = FALSE;
4761 /* Close the socket, and return the appropriate value, first setting
4762 works because the NULL setting is passed back to the calling process, and
4763 remote_max_parallel is forced to 1 when delivering over an existing connection,
4765 If all went well and continue_more is set, we shouldn't actually get here if
4766 there are further addresses, as the return above will be taken. However,
4767 writing RSET might have failed, or there may be other addresses whose hosts are
4768 specified in the transports, and therefore not visible at top level, in which
4769 case continue_more won't get set. */
4773 /* This flushes data queued in the socket, being the QUIT and any TLS Close,
4774 sending them along with the client FIN flag. Us (we hope) sending FIN first
4775 means we (client) take the TIME_WAIT state, so the server (which likely has a
4776 higher connection rate) does not have to. */
4778 HDEBUG(D_transport|D_acl|D_v) debug_printf_indent(" SMTP(shutdown)>>\n");
4779 shutdown(sx->cctx.sock, SHUT_WR);
4782 if (sx->send_quit || tcw_done && !tcw)
4784 /* Wait for (we hope) ack of our QUIT, and a server FIN. Discard any data
4785 received, then discard the socket. Any packet received after then, or receive
4786 data still in the socket, will get a RST - hence the pause/drain. */
4788 /* Reap the response to QUIT, timing out after one second */
4789 (void) smtp_read_response(sx, sx->buffer, sizeof(sx->buffer), '2', 1);
4791 if (sx->cctx.tls_ctx)
4795 /* Reap the TLS Close Notify from the server, timing out after one second */
4796 sigalrm_seen = FALSE;
4799 n = tls_read(sx->cctx.tls_ctx, sx->inbuffer, sizeof(sx->inbuffer));
4800 while (!sigalrm_seen && n > 0);
4803 # ifdef EXIM_TCP_CORK
4804 (void) setsockopt(sx->cctx.sock, IPPROTO_TCP, EXIM_TCP_CORK, US &on, sizeof(on));
4806 tls_close(sx->cctx.tls_ctx, TLS_SHUTDOWN_WAIT);
4807 sx->cctx.tls_ctx = NULL;
4811 if (fcntl(sx->cctx.sock, F_SETFL, O_NONBLOCK) == 0)
4812 for (int i = 16, n; /* drain socket */
4813 (n = read(sx->cctx.sock, sx->inbuffer, sizeof(sx->inbuffer))) > 0 && i > 0;
4814 i--) HDEBUG(D_transport|D_acl|D_v)
4817 debug_printf_indent(" SMTP(drain %d bytes)<< %.*s\n", n, m, sx->inbuffer);
4818 for (m = 0; m < n; m++)
4819 debug_printf("0x%02x\n", sx->inbuffer[m]);
4822 HDEBUG(D_transport|D_acl|D_v) debug_printf_indent(" SMTP(close)>>\n");
4823 (void)close(sx->cctx.sock);
4825 continue_transport = NULL;
4826 continue_hostname = NULL;
4828 #ifndef DISABLE_EVENT
4829 (void) event_raise(tblock->event_action, US"tcp:close", NULL);
4835 sx->first_addr = NULL;
4836 for (address_item * a = sx->addrlist->next; a; a = a->next)
4837 if (a->transport_return == DANE)
4839 a->transport_return = PENDING_DEFER;
4840 if (!sx->first_addr)
4842 /* Remember the new start-point in the addrlist, for smtp_setup_conn()
4843 to get the domain string for SNI */
4846 clearflag(a, af_cont_conn);
4847 setflag(a, af_new_conn); /* clear * from logging */
4848 DEBUG(D_transport) debug_printf("DANE: go-around for %s\n", a->domain);
4851 continue_sequence = 1; /* for consistency */
4856 #ifdef EXPERIMENTAL_ESMTP_LIMITS
4857 if (mail_limit && sx->first_addr)
4859 /* Reset the sequence count since we closed the connection. This is flagged
4860 on the pipe back to the delivery process so that a non-continued-conn delivery
4863 continue_sequence = 1; /* for consistency */
4864 clearflag(sx->first_addr, af_cont_conn);
4865 setflag(sx->first_addr, af_new_conn); /* clear * from logging */
4874 if (dane_held) for (address_item * a = sx->addrlist->next; a; a = a->next)
4875 if (a->transport_return == DANE)
4876 a->transport_return = PENDING_DEFER;
4884 /*************************************************
4885 * Closedown entry point *
4886 *************************************************/
4888 /* This function is called when exim is passed an open smtp channel
4889 from another incarnation, but the message which it has been asked
4890 to deliver no longer exists. The channel is on stdin.
4892 We might do fancy things like looking for another message to send down
4893 the channel, but if the one we sought has gone, it has probably been
4894 delivered by some other process that itself will seek further messages,
4895 so just close down our connection.
4897 Argument: pointer to the transport instance block
4902 smtp_transport_closedown(transport_instance *tblock)
4904 smtp_transport_options_block * ob = SOB tblock->options_block;
4905 client_conn_ctx cctx;
4908 uschar inbuffer[4096];
4909 uschar outbuffer[16];
4911 /*XXX really we need an active-smtp-client ctx, rather than assuming stdout */
4912 cctx.sock = fileno(stdin);
4913 cctx.tls_ctx = cctx.sock == tls_out.active.sock ? tls_out.active.tls_ctx : NULL;
4915 sx.inblock.cctx = &cctx;
4916 sx.inblock.buffer = inbuffer;
4917 sx.inblock.buffersize = sizeof(inbuffer);
4918 sx.inblock.ptr = inbuffer;
4919 sx.inblock.ptrend = inbuffer;
4921 sx.outblock.cctx = &cctx;
4922 sx.outblock.buffersize = sizeof(outbuffer);
4923 sx.outblock.buffer = outbuffer;
4924 sx.outblock.ptr = outbuffer;
4925 sx.outblock.cmd_count = 0;
4926 sx.outblock.authenticating = FALSE;
4928 (void)smtp_write_command(&sx, SCMD_FLUSH, "QUIT\r\n");
4929 (void)smtp_read_response(&sx, buffer, sizeof(buffer), '2', ob->command_timeout);
4930 (void)close(cctx.sock);
4935 /*************************************************
4936 * Prepare addresses for delivery *
4937 *************************************************/
4939 /* This function is called to flush out error settings from previous delivery
4940 attempts to other hosts. It also records whether we got here via an MX record
4941 or not in the more_errno field of the address. We are interested only in
4942 addresses that are still marked DEFER - others may have got delivered to a
4943 previously considered IP address. Set their status to PENDING_DEFER to indicate
4944 which ones are relevant this time.
4947 addrlist the list of addresses
4948 host the host we are delivering to
4950 Returns: the first address for this delivery
4953 static address_item *
4954 prepare_addresses(address_item *addrlist, host_item *host)
4956 address_item *first_addr = NULL;
4957 for (address_item * addr = addrlist; addr; addr = addr->next)
4958 if (addr->transport_return == DEFER)
4960 if (!first_addr) first_addr = addr;
4961 addr->transport_return = PENDING_DEFER;
4962 addr->basic_errno = 0;
4963 addr->more_errno = (host->mx >= 0)? 'M' : 'A';
4964 addr->message = NULL;
4966 addr->cipher = NULL;
4967 addr->ourcert = NULL;
4968 addr->peercert = NULL;
4969 addr->peerdn = NULL;
4970 addr->ocsp = OCSP_NOT_REQ;
4971 addr->tlsver = NULL;
4973 #ifdef EXPERIMENTAL_DSN_INFO
4974 addr->smtp_greeting = NULL;
4975 addr->helo_response = NULL;
4983 /*************************************************
4984 * Main entry point *
4985 *************************************************/
4987 /* See local README for interface details. As this is a remote transport, it is
4988 given a chain of addresses to be delivered in one connection, if possible. It
4989 always returns TRUE, indicating that each address has its own independent
4990 status set, except if there is a setting up problem, in which case it returns
4994 smtp_transport_entry(
4995 transport_instance *tblock, /* data for this instantiation */
4996 address_item *addrlist) /* addresses we are working on */
4999 int hosts_defer = 0;
5001 int hosts_looked_up = 0;
5002 int hosts_retry = 0;
5003 int hosts_serial = 0;
5004 int hosts_total = 0;
5005 int total_hosts_tried = 0;
5006 BOOL expired = TRUE;
5007 uschar *expanded_hosts = NULL;
5009 uschar *tid = string_sprintf("%s transport", tblock->name);
5010 smtp_transport_options_block *ob = SOB tblock->options_block;
5011 host_item *hostlist = addrlist->host_list;
5012 host_item *host = NULL;
5016 debug_printf("%s transport entered\n", tblock->name);
5017 for (address_item * addr = addrlist; addr; addr = addr->next)
5018 debug_printf(" %s\n", addr->address);
5021 debug_printf("hostlist:\n");
5022 for (host_item * host = hostlist; host; host = host->next)
5023 debug_printf(" '%s' IP %s port %d\n", host->name, host->address, host->port);
5025 if (continue_hostname)
5026 debug_printf("already connected to %s [%s] (on fd %d)\n",
5027 continue_hostname, continue_host_address,
5028 cutthrough.cctx.sock >= 0 ? cutthrough.cctx.sock : 0);
5031 /* Check the restrictions on line length */
5033 if (max_received_linelength > ob->message_linelength_limit)
5036 gettimeofday(&now, NULL);
5038 for (address_item * addr = addrlist; addr; addr = addr->next)
5039 if (addr->transport_return == DEFER)
5040 addr->transport_return = PENDING_DEFER;
5042 set_errno_nohost(addrlist, ERRNO_SMTPFORMAT,
5043 US"message has lines too long for transport", FAIL, TRUE, &now);
5047 /* Set the flag requesting that these hosts be added to the waiting
5048 database if the delivery fails temporarily or if we are running with
5049 queue_smtp or a 2-stage queue run. This gets unset for certain
5050 kinds of error, typically those that are specific to the message. */
5052 update_waiting = TRUE;
5054 /* If a host list is not defined for the addresses - they must all have the
5055 same one in order to be passed to a single transport - or if the transport has
5056 a host list with hosts_override set, use the host list supplied with the
5057 transport. It is an error for this not to exist. */
5059 if (!hostlist || (ob->hosts_override && ob->hosts))
5063 addrlist->message = string_sprintf("%s transport called with no hosts set",
5065 addrlist->transport_return = PANIC;
5066 return FALSE; /* Only top address has status */
5069 DEBUG(D_transport) debug_printf("using the transport's hosts: %s\n",
5072 /* If the transport's host list contains no '$' characters, and we are not
5073 randomizing, it is fixed and therefore a chain of hosts can be built once
5074 and for all, and remembered for subsequent use by other calls to this
5075 transport. If, on the other hand, the host list does contain '$', or we are
5076 randomizing its order, we have to rebuild it each time. In the fixed case,
5077 as the hosts string will never be used again, it doesn't matter that we
5078 replace all the : characters with zeros. */
5082 uschar *s = ob->hosts;
5084 if (Ustrchr(s, '$'))
5086 if (!(expanded_hosts = expand_string(s)))
5088 addrlist->message = string_sprintf("failed to expand list of hosts "
5089 "\"%s\" in %s transport: %s", s, tblock->name, expand_string_message);
5090 addrlist->transport_return = f.search_find_defer ? DEFER : PANIC;
5091 return FALSE; /* Only top address has status */
5093 DEBUG(D_transport) debug_printf("expanded list of hosts \"%s\" to "
5094 "\"%s\"\n", s, expanded_hosts);
5098 if (ob->hosts_randomize) s = expanded_hosts = string_copy(s);
5100 if (is_tainted2(s, LOG_MAIN|LOG_PANIC, "Tainted host list '%s' from '%s' in transport %s", s, ob->hosts, tblock->name))
5102 /* Avoid leaking info to an attacker */
5103 addrlist->message = US"internal configuration error";
5104 addrlist->transport_return = PANIC;
5108 host_build_hostlist(&hostlist, s, ob->hosts_randomize);
5110 /* Check that the expansion yielded something useful. */
5114 string_sprintf("%s transport has empty hosts setting", tblock->name);
5115 addrlist->transport_return = PANIC;
5116 return FALSE; /* Only top address has status */
5119 /* If there was no expansion of hosts, save the host list for
5122 if (!expanded_hosts) ob->hostlist = hostlist;
5125 /* This is not the first time this transport has been run in this delivery;
5126 the host list was built previously. */
5129 hostlist = ob->hostlist;
5132 /* The host list was supplied with the address. If hosts_randomize is set, we
5133 must sort it into a random order if it did not come from MX records and has not
5134 already been randomized (but don't bother if continuing down an existing
5137 else if (ob->hosts_randomize && hostlist->mx == MX_NONE && !continue_hostname)
5139 host_item *newlist = NULL;
5142 host_item *h = hostlist;
5143 hostlist = hostlist->next;
5145 h->sort_key = random_number(100);
5152 else if (h->sort_key < newlist->sort_key)
5159 host_item *hh = newlist;
5162 if (h->sort_key < hh->next->sort_key) break;
5170 hostlist = addrlist->host_list = newlist;
5173 /* Sort out the default port. */
5175 if (!smtp_get_port(ob->port, addrlist, &defport, tid)) return FALSE;
5177 /* For each host-plus-IP-address on the list:
5179 . If this is a continued delivery and the host isn't the one with the
5180 current connection, skip.
5182 . If the status is unusable (i.e. previously failed or retry checked), skip.
5184 . If no IP address set, get the address, either by turning the name into
5185 an address, calling gethostbyname if gethostbyname is on, or by calling
5186 the DNS. The DNS may yield multiple addresses, in which case insert the
5187 extra ones into the list.
5189 . Get the retry data if not previously obtained for this address and set the
5190 field which remembers the state of this address. Skip if the retry time is
5191 not reached. If not, remember whether retry data was found. The retry string
5192 contains both the name and the IP address.
5194 . Scan the list of addresses and mark those whose status is DEFER as
5195 PENDING_DEFER. These are the only ones that will be processed in this cycle
5198 . Make a delivery attempt - addresses marked PENDING_DEFER will be tried.
5199 Some addresses may be successfully delivered, others may fail, and yet
5200 others may get temporary errors and so get marked DEFER.
5202 . The return from the delivery attempt is OK if a connection was made and a
5203 valid SMTP dialogue was completed. Otherwise it is DEFER.
5205 . If OK, add a "remove" retry item for this host/IPaddress, if any.
5207 . If fail to connect, or other defer state, add a retry item.
5209 . If there are any addresses whose status is still DEFER, carry on to the
5210 next host/IPaddress, unless we have tried the number of hosts given
5211 by hosts_max_try or hosts_max_try_hardlimit; otherwise return. Note that
5212 there is some fancy logic for hosts_max_try that means its limit can be
5213 overstepped in some circumstances.
5215 If we get to the end of the list, all hosts have deferred at least one address,
5216 or not reached their retry times. If delay_after_cutoff is unset, it requests a
5217 delivery attempt to those hosts whose last try was before the arrival time of
5218 the current message. To cope with this, we have to go round the loop a second
5219 time. After that, set the status and error data for any addresses that haven't
5220 had it set already. */
5222 for (int cutoff_retry = 0;
5223 expired && cutoff_retry < (ob->delay_after_cutoff ? 1 : 2);
5226 host_item *nexthost = NULL;
5227 int unexpired_hosts_tried = 0;
5228 BOOL continue_host_tried = FALSE;
5230 retry_non_continued:
5231 for (host = hostlist;
5233 && unexpired_hosts_tried < ob->hosts_max_try
5234 && total_hosts_tried < ob->hosts_max_try_hardlimit;
5239 BOOL host_is_expired = FALSE;
5240 BOOL message_defer = FALSE;
5241 BOOL some_deferred = FALSE;
5242 address_item *first_addr = NULL;
5243 uschar *interface = NULL;
5244 uschar *retry_host_key = NULL;
5245 uschar *retry_message_key = NULL;
5246 uschar *serialize_key = NULL;
5248 /* Default next host is next host. :-) But this can vary if the
5249 hosts_max_try limit is hit (see below). It may also be reset if a host
5250 address is looked up here (in case the host was multihomed). */
5252 nexthost = host->next;
5254 /* If the address hasn't yet been obtained from the host name, look it up
5255 now, unless the host is already marked as unusable. If it is marked as
5256 unusable, it means that the router was unable to find its IP address (in
5257 the DNS or wherever) OR we are in the 2nd time round the cutoff loop, and
5258 the lookup failed last time. We don't get this far if *all* MX records
5259 point to non-existent hosts; that is treated as a hard error.
5261 We can just skip this host entirely. When the hosts came from the router,
5262 the address will timeout based on the other host(s); when the address is
5263 looked up below, there is an explicit retry record added.
5265 Note that we mustn't skip unusable hosts if the address is not unset; they
5266 may be needed as expired hosts on the 2nd time round the cutoff loop. */
5270 int new_port, flags;
5272 if (host->status >= hstatus_unusable)
5274 DEBUG(D_transport) debug_printf("%s has no address and is unusable - skipping\n",
5279 DEBUG(D_transport) debug_printf("getting address for %s\n", host->name);
5281 /* The host name is permitted to have an attached port. Find it, and
5282 strip it from the name. Just remember it for now. */
5284 new_port = host_item_get_port(host);
5286 /* Count hosts looked up */
5290 /* Find by name if so configured, or if it's an IP address. We don't
5291 just copy the IP address, because we need the test-for-local to happen. */
5293 flags = HOST_FIND_BY_A | HOST_FIND_BY_AAAA;
5294 if (ob->dns_qualify_single) flags |= HOST_FIND_QUALIFY_SINGLE;
5295 if (ob->dns_search_parents) flags |= HOST_FIND_SEARCH_PARENTS;
5297 if (ob->gethostbyname || string_is_ip_address(host->name, NULL) != 0)
5298 rc = host_find_byname(host, NULL, flags, NULL, TRUE);
5300 rc = host_find_bydns(host, NULL, flags, NULL, NULL, NULL,
5301 &ob->dnssec, /* domains for request/require */
5304 /* Update the host (and any additional blocks, resulting from
5305 multihoming) with a host-specific port, if any. */
5307 for (host_item * hh = host; hh != nexthost; hh = hh->next) hh->port = new_port;
5309 /* Failure to find the host at this time (usually DNS temporary failure)
5310 is really a kind of routing failure rather than a transport failure.
5311 Therefore we add a retry item of the routing kind, not to stop us trying
5312 to look this name up here again, but to ensure the address gets timed
5313 out if the failures go on long enough. A complete failure at this point
5314 commonly points to a configuration error, but the best action is still
5315 to carry on for the next host. */
5317 if (rc == HOST_FIND_AGAIN || rc == HOST_FIND_SECURITY || rc == HOST_FIND_FAILED)
5319 retry_add_item(addrlist, string_sprintf("R:%s", host->name), 0);
5321 if (rc == HOST_FIND_AGAIN) hosts_defer++; else hosts_fail++;
5322 DEBUG(D_transport) debug_printf("rc = %s for %s\n", (rc == HOST_FIND_AGAIN)?
5323 "HOST_FIND_AGAIN" : "HOST_FIND_FAILED", host->name);
5324 host->status = hstatus_unusable;
5326 for (address_item * addr = addrlist; addr; addr = addr->next)
5328 if (addr->transport_return != DEFER) continue;
5329 addr->basic_errno = ERRNO_UNKNOWNHOST;
5330 addr->message = string_sprintf(
5331 rc == HOST_FIND_SECURITY
5332 ? "lookup of IP address for %s was insecure"
5333 : "failed to lookup IP address for %s",
5339 /* If the host is actually the local host, we may have a problem, or
5340 there may be some cunning configuration going on. In the problem case,
5341 log things and give up. The default transport status is already DEFER. */
5343 if (rc == HOST_FOUND_LOCAL && !ob->allow_localhost)
5345 for (address_item * addr = addrlist; addr; addr = addr->next)
5347 addr->basic_errno = ERRNO_HOST_IS_LOCAL;
5348 addr->message = string_sprintf("%s transport found host %s to be "
5349 "local", tblock->name, host->name);
5353 } /* End of block for IP address lookup */
5355 /* If this is a continued delivery, we are interested only in the host
5356 which matches the name of the existing open channel. The check is put
5357 here after the local host lookup, in case the name gets expanded as a
5358 result of the lookup. Set expired FALSE, to save the outer loop executing
5361 if (continue_hostname)
5362 if ( Ustrcmp(continue_hostname, host->name) != 0
5363 || Ustrcmp(continue_host_address, host->address) != 0
5367 continue; /* With next host */
5370 continue_host_tried = TRUE;
5372 /* Reset the default next host in case a multihomed host whose addresses
5373 are not looked up till just above added to the host list. */
5375 nexthost = host->next;
5377 /* If queue_smtp is set (-odqs or the first part of a 2-stage run), or the
5378 domain is in queue_smtp_domains, we don't actually want to attempt any
5379 deliveries. When doing a queue run, queue_smtp_domains is always unset. If
5380 there is a lookup defer in queue_smtp_domains, proceed as if the domain
5381 were not in it. We don't want to hold up all SMTP deliveries! Except when
5382 doing a two-stage queue run, don't do this if forcing. */
5384 if ( (!f.deliver_force || f.queue_2stage)
5386 || match_isinlist(addrlist->domain,
5387 CUSS &queue_smtp_domains, 0,
5388 &domainlist_anchor, NULL, MCL_DOMAIN, TRUE, NULL) == OK)
5391 DEBUG(D_transport) debug_printf("first-pass routing only\n");
5393 for (address_item * addr = addrlist; addr; addr = addr->next)
5394 if (addr->transport_return == DEFER)
5395 addr->message = US"first-pass only routing due to -odqs, "
5396 "queue_smtp_domains or control=queue";
5397 continue; /* With next host */
5400 /* Count hosts being considered - purely for an intelligent comment
5401 if none are usable. */
5405 /* Set $host and $host address now in case they are needed for the
5406 interface expansion or the serialize_hosts check; they remain set if an
5407 actual delivery happens. */
5409 deliver_host = host->name;
5410 deliver_host_address = host->address;
5411 lookup_dnssec_authenticated = host->dnssec == DS_YES ? US"yes"
5412 : host->dnssec == DS_NO ? US"no"
5415 /* Set up a string for adding to the retry key if the port number is not
5416 the standard SMTP port. A host may have its own port setting that overrides
5419 pistring = string_sprintf(":%d", host->port == PORT_NONE
5420 ? defport : host->port);
5421 if (Ustrcmp(pistring, ":25") == 0) pistring = US"";
5423 /* Select IPv4 or IPv6, and choose an outgoing interface. If the interface
5424 string is set, even if constant (as different transports can have different
5425 constant settings), we must add it to the key that is used for retries,
5426 because connections to the same host from a different interface should be
5427 treated separately. */
5429 host_af = Ustrchr(host->address, ':') ? AF_INET6 : AF_INET;
5431 uschar * s = ob->interface;
5434 if (!smtp_get_interface(s, host_af, addrlist, &interface, tid))
5436 pistring = string_sprintf("%s/%s", pistring, interface);
5440 /* The first time round the outer loop, check the status of the host by
5441 inspecting the retry data. The second time round, we are interested only
5442 in expired hosts that haven't been tried since this message arrived. */
5444 if (cutoff_retry == 0)
5447 /* Ensure the status of the address is set by checking retry data if
5448 necessary. There may be host-specific retry data (applicable to all
5449 messages) and also data for retries of a specific message at this host.
5450 If either of these retry records are actually read, the keys used are
5451 returned to save recomputing them later. */
5453 if (exp_bool(addrlist, US"transport", tblock->name, D_transport,
5454 US"retry_include_ip_address", ob->retry_include_ip_address,
5455 ob->expand_retry_include_ip_address, &incl_ip) != OK)
5456 continue; /* with next host */
5458 host_is_expired = retry_check_address(addrlist->domain, host, pistring,
5459 incl_ip, &retry_host_key, &retry_message_key);
5461 DEBUG(D_transport) debug_printf("%s [%s]%s retry-status = %s\n", host->name,
5462 host->address ? host->address : US"", pistring,
5463 host->status == hstatus_usable ? "usable"
5464 : host->status == hstatus_unusable ? "unusable"
5465 : host->status == hstatus_unusable_expired ? "unusable (expired)" : "?");
5467 /* Skip this address if not usable at this time, noting if it wasn't
5468 actually expired, both locally and in the address. */
5470 switch (host->status)
5472 case hstatus_unusable:
5474 setflag(addrlist, af_retry_skipped);
5477 case hstatus_unusable_expired:
5480 case hwhy_retry: hosts_retry++; break;
5481 case hwhy_failed: hosts_fail++; break;
5483 case hwhy_deferred: hosts_defer++; break;
5486 /* If there was a retry message key, implying that previously there
5487 was a message-specific defer, we don't want to update the list of
5488 messages waiting for these hosts. */
5490 if (retry_message_key) update_waiting = FALSE;
5491 continue; /* With the next host or IP address */
5495 /* Second time round the loop: if the address is set but expired, and
5496 the message is newer than the last try, let it through. */
5501 || host->status != hstatus_unusable_expired
5502 || host->last_try > received_time.tv_sec)
5504 DEBUG(D_transport) debug_printf("trying expired host %s [%s]%s\n",
5505 host->name, host->address, pistring);
5506 host_is_expired = TRUE;
5509 /* Setting "expired=FALSE" doesn't actually mean not all hosts are expired;
5510 it remains TRUE only if all hosts are expired and none are actually tried.
5515 /* If this host is listed as one to which access must be serialized,
5516 see if another Exim process has a connection to it, and if so, skip
5517 this host. If not, update the database to record our connection to it
5518 and remember this for later deletion. Do not do any of this if we are
5519 sending the message down a pre-existing connection. */
5521 if ( !continue_hostname
5522 && verify_check_given_host(CUSS &ob->serialize_hosts, host) == OK)
5524 serialize_key = string_sprintf("host-serialize-%s", host->name);
5525 if (!enq_start(serialize_key, 1))
5528 debug_printf("skipping host %s because another Exim process "
5529 "is connected to it\n", host->name);
5535 /* OK, we have an IP address that is not waiting for its retry time to
5536 arrive (it might be expired) OR (second time round the loop) we have an
5537 expired host that hasn't been tried since the message arrived. Have a go
5538 at delivering the message to it. First prepare the addresses by flushing
5539 out the result of previous attempts, and finding the first address that
5540 is still to be delivered. */
5542 first_addr = prepare_addresses(addrlist, host);
5544 DEBUG(D_transport) debug_printf("delivering %s to %s [%s] (%s%s)\n",
5545 message_id, host->name, host->address, addrlist->address,
5546 addrlist->next ? ", ..." : "");
5548 set_process_info("delivering %s to %s [%s]%s (%s%s)",
5549 message_id, host->name, host->address, pistring, addrlist->address,
5550 addrlist->next ? ", ..." : "");
5552 /* This is not for real; don't do the delivery. If there are
5553 any remaining hosts, list them. */
5558 gettimeofday(&now, NULL);
5559 set_errno_nohost(addrlist, 0, NULL, OK, FALSE, &now);
5560 for (address_item * addr = addrlist; addr; addr = addr->next)
5562 addr->host_used = host;
5563 addr->special_action = '*';
5564 addr->message = US"delivery bypassed by -N option";
5568 debug_printf("*** delivery by %s transport bypassed by -N option\n"
5569 "*** host and remaining hosts:\n", tblock->name);
5570 for (host_item * host2 = host; host2; host2 = host2->next)
5571 debug_printf(" %s [%s]\n", host2->name,
5572 host2->address ? host2->address : US"unset");
5577 /* This is for real. If the host is expired, we don't count it for
5578 hosts_max_retry. This ensures that all hosts must expire before an address
5579 is timed out, unless hosts_max_try_hardlimit (which protects against
5580 lunatic DNS configurations) is reached.
5582 If the host is not expired and we are about to hit the hosts_max_retry
5583 limit, check to see if there is a subsequent hosts with a different MX
5584 value. If so, make that the next host, and don't count this one. This is a
5585 heuristic to make sure that different MXs do get tried. With a normal kind
5586 of retry rule, they would get tried anyway when the earlier hosts were
5587 delayed, but if the domain has a "retry every time" type of rule - as is
5588 often used for the the very large ISPs, that won't happen. */
5593 /* Make a copy of the host if it is local to this invocation
5594 of the transport. */
5598 thost = store_get(sizeof(host_item), FALSE);
5600 thost->name = string_copy(host->name);
5601 thost->address = string_copy(host->address);
5606 if (!host_is_expired && ++unexpired_hosts_tried >= ob->hosts_max_try)
5609 debug_printf("hosts_max_try limit reached with this host\n");
5610 for (host_item * h = host; h; h = h->next) if (h->mx != host->mx)
5613 unexpired_hosts_tried--;
5614 DEBUG(D_transport) debug_printf("however, a higher MX host exists "
5615 "and will be tried\n");
5620 /* Attempt the delivery. */
5622 total_hosts_tried++;
5623 rc = smtp_deliver(addrlist, thost, host_af, defport, interface, tblock,
5624 &message_defer, FALSE);
5627 OK => connection made, each address contains its result;
5628 message_defer is set for message-specific defers (when all
5629 recipients are marked defer)
5630 DEFER => there was a non-message-specific delivery problem;
5631 ERROR => there was a problem setting up the arguments for a filter,
5632 or there was a problem with expanding added headers
5635 /* If the result is not OK, there was a non-message-specific problem.
5636 If the result is DEFER, we need to write to the logs saying what happened
5637 for this particular host, except in the case of authentication and TLS
5638 failures, where the log has already been written. If all hosts defer a
5639 general message is written at the end. */
5641 if (rc == DEFER && first_addr->basic_errno != ERRNO_AUTHFAIL
5642 && first_addr->basic_errno != ERRNO_TLSFAILURE)
5643 write_logs(host, first_addr->message, first_addr->basic_errno);
5645 #ifndef DISABLE_EVENT
5647 deferred_event_raise(first_addr, host, US"msg:host:defer");
5650 /* If STARTTLS was accepted, but there was a failure in setting up the
5651 TLS session (usually a certificate screwup), and the host is not in
5652 hosts_require_tls, and tls_tempfail_tryclear is true, try again, with
5653 TLS forcibly turned off. We have to start from scratch with a new SMTP
5654 connection. That's why the retry is done from here, not from within
5655 smtp_deliver(). [Rejections of STARTTLS itself don't screw up the
5656 session, so the in-clear transmission after those errors, if permitted,
5657 happens inside smtp_deliver().] */
5661 && first_addr->basic_errno == ERRNO_TLSFAILURE
5662 && ob->tls_tempfail_tryclear
5663 && verify_check_given_host(CUSS &ob->hosts_require_tls, host) != OK
5666 log_write(0, LOG_MAIN,
5667 "%s: delivering unencrypted to H=%s [%s] (not in hosts_require_tls)",
5668 first_addr->message, host->name, host->address);
5669 first_addr = prepare_addresses(addrlist, host);
5670 rc = smtp_deliver(addrlist, thost, host_af, defport, interface, tblock,
5671 &message_defer, TRUE);
5672 if (rc == DEFER && first_addr->basic_errno != ERRNO_AUTHFAIL)
5673 write_logs(host, first_addr->message, first_addr->basic_errno);
5674 # ifndef DISABLE_EVENT
5676 deferred_event_raise(first_addr, host, US"msg:host:defer");
5679 #endif /*DISABLE_TLS*/
5681 #ifndef DISABLE_EVENT
5682 /* If the last host gave a defer raise a per-message event */
5685 && unexpired_hosts_tried < ob->hosts_max_try
5686 && total_hosts_tried < ob->hosts_max_try_hardlimit
5688 && (message_defer || rc == DEFER)
5690 deferred_event_raise(first_addr, host, US"msg:defer");
5694 /* Delivery attempt finished */
5696 set_process_info("delivering %s: just tried %s [%s]%s for %s%s: result %s",
5697 message_id, host->name, host->address, pistring, addrlist->address,
5698 addrlist->next ? " (& others)" : "", rc_to_string(rc));
5700 /* Release serialization if set up */
5702 if (serialize_key) enq_end(serialize_key);
5704 /* If the result is DEFER, or if a host retry record is known to exist, we
5705 need to add an item to the retry chain for updating the retry database
5706 at the end of delivery. We only need to add the item to the top address,
5707 of course. Also, if DEFER, we mark the IP address unusable so as to skip it
5708 for any other delivery attempts using the same address. (It is copied into
5709 the unusable tree at the outer level, so even if different address blocks
5710 contain the same address, it still won't get tried again.) */
5712 if (rc == DEFER || retry_host_key)
5714 int delete_flag = rc != DEFER ? rf_delete : 0;
5715 if (!retry_host_key)
5718 if (exp_bool(addrlist, US"transport", tblock->name, D_transport,
5719 US"retry_include_ip_address", ob->retry_include_ip_address,
5720 ob->expand_retry_include_ip_address, &incl_ip) != OK)
5721 incl_ip = TRUE; /* error; use most-specific retry record */
5723 retry_host_key = incl_ip
5724 ? string_sprintf("T:%S:%s%s", host->name, host->address, pistring)
5725 : string_sprintf("T:%S%s", host->name, pistring);
5728 /* If a delivery of another message over an existing SMTP connection
5729 yields DEFER, we do NOT set up retry data for the host. This covers the
5730 case when there are delays in routing the addresses in the second message
5731 that are so long that the server times out. This is alleviated by not
5732 routing addresses that previously had routing defers when handling an
5733 existing connection, but even so, this case may occur (e.g. if a
5734 previously happily routed address starts giving routing defers). If the
5735 host is genuinely down, another non-continued message delivery will
5736 notice it soon enough. */
5738 if (delete_flag != 0 || !continue_hostname)
5739 retry_add_item(first_addr, retry_host_key, rf_host | delete_flag);
5741 /* We may have tried an expired host, if its retry time has come; ensure
5742 the status reflects the expiry for the benefit of any other addresses. */
5746 host->status = host_is_expired
5747 ? hstatus_unusable_expired : hstatus_unusable;
5748 host->why = hwhy_deferred;
5752 /* If message_defer is set (host was OK, but every recipient got deferred
5753 because of some message-specific problem), or if that had happened
5754 previously so that a message retry key exists, add an appropriate item
5755 to the retry chain. Note that if there was a message defer but now there is
5756 a host defer, the message defer record gets deleted. That seems perfectly
5757 reasonable. Also, stop the message from being remembered as waiting
5758 for specific hosts. */
5760 if (message_defer || retry_message_key)
5762 int delete_flag = message_defer ? 0 : rf_delete;
5763 if (!retry_message_key)
5766 if (exp_bool(addrlist, US"transport", tblock->name, D_transport,
5767 US"retry_include_ip_address", ob->retry_include_ip_address,
5768 ob->expand_retry_include_ip_address, &incl_ip) != OK)
5769 incl_ip = TRUE; /* error; use most-specific retry record */
5771 retry_message_key = incl_ip
5772 ? string_sprintf("T:%S:%s%s:%s", host->name, host->address, pistring,
5774 : string_sprintf("T:%S%s:%s", host->name, pistring, message_id);
5776 retry_add_item(addrlist, retry_message_key,
5777 rf_message | rf_host | delete_flag);
5778 update_waiting = FALSE;
5781 /* Any return other than DEFER (that is, OK or ERROR) means that the
5782 addresses have got their final statuses filled in for this host. In the OK
5783 case, see if any of them are deferred. */
5786 for (address_item * addr = addrlist; addr; addr = addr->next)
5787 if (addr->transport_return == DEFER)
5789 some_deferred = TRUE;
5793 /* If no addresses deferred or the result was ERROR, return. We do this for
5794 ERROR because a failing filter set-up or add_headers expansion is likely to
5795 fail for any host we try. */
5797 if (rc == ERROR || (rc == OK && !some_deferred))
5799 DEBUG(D_transport) debug_printf("Leaving %s transport\n", tblock->name);
5800 return TRUE; /* Each address has its status */
5803 /* If the result was DEFER or some individual addresses deferred, let
5804 the loop run to try other hosts with the deferred addresses, except for the
5805 case when we were trying to deliver down an existing channel and failed.
5806 Don't try any other hosts in this case. */
5808 if (continue_hostname) break;
5810 /* If the whole delivery, or some individual addresses, were deferred and
5811 there are more hosts that could be tried, do not count this host towards
5812 the hosts_max_try limit if the age of the message is greater than the
5813 maximum retry time for this host. This means we may try try all hosts,
5814 ignoring the limit, when messages have been around for some time. This is
5815 important because if we don't try all hosts, the address will never time
5816 out. NOTE: this does not apply to hosts_max_try_hardlimit. */
5818 if ((rc == DEFER || some_deferred) && nexthost)
5821 retry_config *retry = retry_find_config(host->name, NULL, 0, 0);
5823 if (retry && retry->rules)
5825 retry_rule *last_rule;
5826 for (last_rule = retry->rules;
5828 last_rule = last_rule->next);
5829 timedout = time(NULL) - received_time.tv_sec > last_rule->timeout;
5831 else timedout = TRUE; /* No rule => timed out */
5835 unexpired_hosts_tried--;
5836 DEBUG(D_transport) debug_printf("temporary delivery error(s) override "
5837 "hosts_max_try (message older than host's retry time)\n");
5843 if (unexpired_hosts_tried >= ob->hosts_max_try)
5844 debug_printf("reached transport hosts_max_try limit %d\n",
5846 if (total_hosts_tried >= ob->hosts_max_try_hardlimit)
5847 debug_printf("reached transport hosts_max_try_hardlimit limit %d\n",
5848 ob->hosts_max_try_hardlimit);
5851 testharness_pause_ms(500); /* let server debug out */
5852 } /* End of loop for trying multiple hosts. */
5854 /* If we failed to find a matching host in the list, for an already-open
5855 connection, just close it and start over with the list. This can happen
5856 for routing that changes from run to run, or big multi-IP sites with
5859 if (continue_hostname && !continue_host_tried)
5861 int fd = cutthrough.cctx.sock >= 0 ? cutthrough.cctx.sock : 0;
5863 DEBUG(D_transport) debug_printf("no hosts match already-open connection\n");
5865 /* A TLS conn could be open for a cutthrough, but not for a plain continued-
5867 /*XXX doublecheck that! */
5869 if (cutthrough.cctx.sock >= 0 && cutthrough.is_tls)
5871 (void) tls_write(cutthrough.cctx.tls_ctx, US"QUIT\r\n", 6, FALSE);
5872 tls_close(cutthrough.cctx.tls_ctx, TLS_SHUTDOWN_NOWAIT);
5873 cutthrough.cctx.tls_ctx = NULL;
5874 cutthrough.is_tls = FALSE;
5878 (void) write(fd, US"QUIT\r\n", 6);
5881 cutthrough.cctx.sock = -1;
5882 continue_hostname = NULL;
5883 goto retry_non_continued;
5886 /* This is the end of the loop that repeats iff expired is TRUE and
5887 ob->delay_after_cutoff is FALSE. The second time round we will
5888 try those hosts that haven't been tried since the message arrived. */
5892 debug_printf("all IP addresses skipped or deferred at least one address\n");
5893 if (expired && !ob->delay_after_cutoff && cutoff_retry == 0)
5894 debug_printf("retrying IP addresses not tried since message arrived\n");
5899 /* Get here if all IP addresses are skipped or defer at least one address. In
5900 MUA wrapper mode, this will happen only for connection or other non-message-
5901 specific failures. Force the delivery status for all addresses to FAIL. */
5905 for (address_item * addr = addrlist; addr; addr = addr->next)
5906 addr->transport_return = FAIL;
5910 /* In the normal, non-wrapper case, add a standard message to each deferred
5911 address if there hasn't been an error, that is, if it hasn't actually been
5912 tried this time. The variable "expired" will be FALSE if any deliveries were
5913 actually tried, or if there was at least one host that was not expired. That
5914 is, it is TRUE only if no deliveries were tried and all hosts were expired. If
5915 a delivery has been tried, an error code will be set, and the failing of the
5916 message is handled by the retry code later.
5918 If queue_smtp is set, or this transport was called to send a subsequent message
5919 down an existing TCP/IP connection, and something caused the host not to be
5920 found, we end up here, but can detect these cases and handle them specially. */
5922 for (address_item * addr = addrlist; addr; addr = addr->next)
5924 /* If host is not NULL, it means that we stopped processing the host list
5925 because of hosts_max_try or hosts_max_try_hardlimit. In the former case, this
5926 means we need to behave as if some hosts were skipped because their retry
5927 time had not come. Specifically, this prevents the address from timing out.
5928 However, if we have hit hosts_max_try_hardlimit, we want to behave as if all
5929 hosts were tried. */
5932 if (total_hosts_tried >= ob->hosts_max_try_hardlimit)
5935 debug_printf("hosts_max_try_hardlimit reached: behave as if all "
5936 "hosts were tried\n");
5941 debug_printf("hosts_max_try limit caused some hosts to be skipped\n");
5942 setflag(addr, af_retry_skipped);
5945 if (f.queue_smtp) /* no deliveries attempted */
5947 addr->transport_return = DEFER;
5948 addr->basic_errno = 0;
5949 addr->message = US"SMTP delivery explicitly queued";
5952 else if ( addr->transport_return == DEFER
5953 && (addr->basic_errno == ERRNO_UNKNOWNERROR || addr->basic_errno == 0)
5957 addr->basic_errno = ERRNO_HRETRY;
5958 if (continue_hostname)
5959 addr->message = US"no host found for existing SMTP connection";
5962 setflag(addr, af_pass_message); /* This is not a security risk */
5963 addr->message = string_sprintf(
5964 "all hosts%s have been failing for a long time %s",
5965 addr->domain ? string_sprintf(" for '%s'", addr->domain) : US"",
5966 ob->delay_after_cutoff
5967 ? US"(and retry time not reached)"
5968 : US"and were last tried after this message arrived");
5970 /* If we are already using fallback hosts, or there are no fallback hosts
5971 defined, convert the result to FAIL to cause a bounce. */
5973 if (addr->host_list == addr->fallback_hosts || !addr->fallback_hosts)
5974 addr->transport_return = FAIL;
5979 if (hosts_retry == hosts_total)
5980 s = "retry time not reached for any host%s";
5981 else if (hosts_fail == hosts_total)
5982 s = "all host address lookups%s failed permanently";
5983 else if (hosts_defer == hosts_total)
5984 s = "all host address lookups%s failed temporarily";
5985 else if (hosts_serial == hosts_total)
5986 s = "connection limit reached for all hosts%s";
5987 else if (hosts_fail+hosts_defer == hosts_total)
5988 s = "all host address lookups%s failed";
5990 s = "some host address lookups failed and retry time "
5991 "not reached for other hosts or connection limit reached%s";
5993 addr->message = string_sprintf(s,
5994 addr->domain ? string_sprintf(" for '%s'", addr->domain) : US"");
5999 /* Update the database which keeps information about which messages are waiting
6000 for which hosts to become available. For some message-specific errors, the
6001 update_waiting flag is turned off because we don't want follow-on deliveries in
6002 those cases. If this transport instance is explicitly limited to one message
6003 per connection then follow-on deliveries are not possible and there's no need
6004 to create/update the per-transport wait-<transport_name> database. */
6006 if (update_waiting && tblock->connection_max_messages != 1)
6007 transport_update_waiting(hostlist, tblock->name);
6011 DEBUG(D_transport) debug_printf("Leaving %s transport\n", tblock->name);
6013 return TRUE; /* Each address has its status */
6016 #endif /*!MACRO_PREDEF*/
6019 /* End of transport/smtp.c */