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"$primary_hostname",
170 .protocol = US"smtp",
171 .hosts_try_chunking = US"*",
173 .hosts_try_dane = US"*",
175 .hosts_try_fastopen = US"*",
177 .hosts_try_prdr = US"*",
180 .hosts_request_ocsp = US"*", /* hosts_request_ocsp (except under DANE; tls_client_start()) */
182 .command_timeout = 5*60,
183 .connect_timeout = 5*60,
184 .data_timeout = 5*60,
185 .final_timeout = 10*60,
186 .size_addition = 1024,
188 .hosts_max_try_hardlimit = 50,
189 .message_linelength_limit = 998,
190 .address_retry_include_sender = TRUE,
191 .dns_qualify_single = TRUE,
192 .dnssec = { .request= US"*", .require=NULL },
193 .delay_after_cutoff = TRUE,
195 .retry_include_ip_address = TRUE,
197 .tls_verify_certificates = US"system",
198 .tls_dh_min_bits = EXIM_CLIENT_DH_DEFAULT_MIN_BITS,
199 .tls_tempfail_tryclear = TRUE,
200 .tls_try_verify_hosts = US"*",
201 .tls_verify_cert_hostnames = US"*",
204 .utf8_downconvert = US"-1",
208 { .dkim_hash = US"sha256", },
212 /* some DSN flags for use later */
214 static int rf_list[] = {rf_notify_never, rf_notify_success,
215 rf_notify_failure, rf_notify_delay };
217 static uschar *rf_names[] = { US"NEVER", US"SUCCESS", US"FAILURE", US"DELAY" };
223 static uschar *smtp_command; /* Points to last cmd for error messages */
224 static uschar *mail_command; /* Points to MAIL cmd for error messages */
225 static uschar *data_command = US""; /* Points to DATA cmd for error messages */
226 static BOOL update_waiting; /* TRUE to update the "wait" database */
228 /*XXX move to smtp_context */
229 static BOOL pipelining_active; /* current transaction is in pipe mode */
232 static unsigned ehlo_response(uschar * buf, unsigned checks);
235 /******************************************************************************/
238 smtp_deliver_init(void)
240 if (!regex_PIPELINING) regex_PIPELINING =
241 regex_must_compile(US"\\n250[\\s\\-]PIPELINING(\\s|\\n|$)", FALSE, TRUE);
243 if (!regex_SIZE) regex_SIZE =
244 regex_must_compile(US"\\n250[\\s\\-]SIZE(\\s|\\n|$)", FALSE, TRUE);
246 if (!regex_AUTH) regex_AUTH =
247 regex_must_compile(AUTHS_REGEX, FALSE, TRUE);
250 if (!regex_STARTTLS) regex_STARTTLS =
251 regex_must_compile(US"\\n250[\\s\\-]STARTTLS(\\s|\\n|$)", FALSE, TRUE);
254 if (!regex_CHUNKING) regex_CHUNKING =
255 regex_must_compile(US"\\n250[\\s\\-]CHUNKING(\\s|\\n|$)", FALSE, TRUE);
258 if (!regex_PRDR) regex_PRDR =
259 regex_must_compile(US"\\n250[\\s\\-]PRDR(\\s|\\n|$)", FALSE, TRUE);
263 if (!regex_UTF8) regex_UTF8 =
264 regex_must_compile(US"\\n250[\\s\\-]SMTPUTF8(\\s|\\n|$)", FALSE, TRUE);
267 if (!regex_DSN) regex_DSN =
268 regex_must_compile(US"\\n250[\\s\\-]DSN(\\s|\\n|$)", FALSE, TRUE);
270 if (!regex_IGNOREQUOTA) regex_IGNOREQUOTA =
271 regex_must_compile(US"\\n250[\\s\\-]IGNOREQUOTA(\\s|\\n|$)", FALSE, TRUE);
273 #ifndef DISABLE_PIPE_CONNECT
274 if (!regex_EARLY_PIPE) regex_EARLY_PIPE =
275 regex_must_compile(US"\\n250[\\s\\-]" EARLY_PIPE_FEATURE_NAME "(\\s|\\n|$)", FALSE, TRUE);
278 #ifdef EXPERIMENTAL_ESMTP_LIMITS
279 if (!regex_LIMITS) regex_LIMITS =
280 regex_must_compile(US"\\n250[\\s\\-]LIMITS\\s", FALSE, TRUE);
285 /*************************************************
286 * Setup entry point *
287 *************************************************/
289 /* This function is called when the transport is about to be used,
290 but before running it in a sub-process. It is used for two things:
292 (1) To set the fallback host list in addresses, when delivering.
293 (2) To pass back the interface, port, protocol, and other options, for use
294 during callout verification.
297 tblock pointer to the transport instance block
298 addrlist list of addresses about to be transported
299 tf if not NULL, pointer to block in which to return options
300 uid the uid that will be set (not used)
301 gid the gid that will be set (not used)
302 errmsg place for error message (not used)
304 Returns: OK always (FAIL, DEFER not used)
308 smtp_transport_setup(transport_instance *tblock, address_item *addrlist,
309 transport_feedback *tf, uid_t uid, gid_t gid, uschar **errmsg)
311 smtp_transport_options_block *ob = SOB tblock->options_block;
313 /* Pass back options if required. This interface is getting very messy. */
317 tf->interface = ob->interface;
319 tf->protocol = ob->protocol;
320 tf->hosts = ob->hosts;
321 tf->hosts_override = ob->hosts_override;
322 tf->hosts_randomize = ob->hosts_randomize;
323 tf->gethostbyname = ob->gethostbyname;
324 tf->qualify_single = ob->dns_qualify_single;
325 tf->search_parents = ob->dns_search_parents;
326 tf->helo_data = ob->helo_data;
329 /* Set the fallback host list for all the addresses that don't have fallback
330 host lists, provided that the local host wasn't present in the original host
333 if (!testflag(addrlist, af_local_host_removed))
334 for (; addrlist; addrlist = addrlist->next)
335 if (!addrlist->fallback_hosts) addrlist->fallback_hosts = ob->fallback_hostlist;
342 /*************************************************
343 * Initialization entry point *
344 *************************************************/
346 /* Called for each instance, after its options have been read, to
347 enable consistency checks to be done, or anything else that needs
350 Argument: pointer to the transport instance block
355 smtp_transport_init(transport_instance *tblock)
357 smtp_transport_options_block *ob = SOB tblock->options_block;
358 int old_pool = store_pool;
360 /* Retry_use_local_part defaults FALSE if unset */
362 if (tblock->retry_use_local_part == TRUE_UNSET)
363 tblock->retry_use_local_part = FALSE;
365 /* Set the default port according to the protocol */
368 ob->port = strcmpic(ob->protocol, US"lmtp") == 0
370 : strcmpic(ob->protocol, US"smtps") == 0
371 ? US"smtps" : US"smtp";
373 /* Set up the setup entry point, to be called before subprocesses for this
376 tblock->setup = smtp_transport_setup;
378 /* Complain if any of the timeouts are zero. */
380 if (ob->command_timeout <= 0 || ob->data_timeout <= 0 ||
381 ob->final_timeout <= 0)
382 log_write(0, LOG_PANIC_DIE|LOG_CONFIG,
383 "command, data, or final timeout value is zero for %s transport",
386 /* If hosts_override is set and there are local hosts, set the global
387 flag that stops verify from showing router hosts. */
389 if (ob->hosts_override && ob->hosts) tblock->overrides_hosts = TRUE;
391 /* If there are any fallback hosts listed, build a chain of host items
392 for them, but do not do any lookups at this time. */
394 store_pool = POOL_PERM;
395 host_build_hostlist(&ob->fallback_hostlist, ob->fallback_hosts, FALSE);
396 store_pool = old_pool;
403 /*************************************************
404 * Set delivery info into all active addresses *
405 *************************************************/
407 /* Only addresses whose status is >= PENDING are relevant. A lesser
408 status means that an address is not currently being processed.
411 addrlist points to a chain of addresses
412 errno_value to put in each address's errno field
413 msg to put in each address's message field
414 rc to put in each address's transport_return field
415 pass_message if TRUE, set the "pass message" flag in the address
416 host if set, mark addrs as having used this host
417 smtp_greeting from peer
418 helo_response from peer
419 start points to timestamp of delivery start
421 If errno_value has the special value ERRNO_CONNECTTIMEOUT, ETIMEDOUT is put in
422 the errno field, and RTEF_CTOUT is ORed into the more_errno field, to indicate
423 this particular type of timeout.
429 set_errno(address_item *addrlist, int errno_value, uschar *msg, int rc,
430 BOOL pass_message, host_item * host,
431 #ifdef EXPERIMENTAL_DSN_INFO
432 const uschar * smtp_greeting, const uschar * helo_response,
434 struct timeval * start
438 struct timeval deliver_time;
440 if (errno_value == ERRNO_CONNECTTIMEOUT)
442 errno_value = ETIMEDOUT;
443 orvalue = RTEF_CTOUT;
445 timesince(&deliver_time, start);
447 for (address_item * addr = addrlist; addr; addr = addr->next)
448 if (addr->transport_return >= PENDING)
450 addr->basic_errno = errno_value;
451 addr->more_errno |= orvalue;
452 addr->delivery_time = deliver_time;
456 if (pass_message) setflag(addr, af_pass_message);
458 addr->transport_return = rc;
461 addr->host_used = host;
462 #ifdef EXPERIMENTAL_DSN_INFO
464 {uschar * s = Ustrchr(smtp_greeting, '\n'); if (s) *s = '\0';}
465 addr->smtp_greeting = smtp_greeting;
468 {uschar * s = Ustrchr(helo_response, '\n'); if (s) *s = '\0';}
469 addr->helo_response = helo_response;
476 set_errno_nohost(address_item * addrlist, int errno_value, uschar * msg, int rc,
477 BOOL pass_message, struct timeval * start)
479 set_errno(addrlist, errno_value, msg, rc, pass_message, NULL,
480 #ifdef EXPERIMENTAL_DSN_INFO
487 /*************************************************
488 * Check an SMTP response *
489 *************************************************/
491 /* This function is given an errno code and the SMTP response buffer
492 to analyse, together with the host identification for generating messages. It
493 sets an appropriate message and puts the first digit of the response code into
494 the yield variable. If no response was actually read, a suitable digit is
498 host the current host, to get its name for messages
499 errno_value pointer to the errno value
500 more_errno from the top address for use with ERRNO_FILTER_FAIL
501 buffer the SMTP response buffer
502 yield where to put a one-digit SMTP response code
503 message where to put an error message
504 pass_message set TRUE if message is an SMTP response
506 Returns: TRUE if an SMTP "QUIT" command should be sent, else FALSE
510 check_response(host_item *host, int *errno_value, int more_errno,
511 uschar *buffer, int *yield, uschar **message, BOOL *pass_message)
513 uschar * pl = pipelining_active ? US"pipelined " : US"";
516 *yield = '4'; /* Default setting is to give a temporary error */
520 case ETIMEDOUT: /* Handle response timeout */
521 *message = US string_sprintf("SMTP timeout after %s%s",
523 if (transport_count > 0)
524 *message = US string_sprintf("%s (%d bytes written)", *message,
528 case ERRNO_SMTPFORMAT: /* Handle malformed SMTP response */
529 s = string_printing(buffer);
530 while (isspace(*s)) s++;
532 ? string_sprintf("Malformed SMTP reply (an empty line) "
533 "in response to %s%s", pl, smtp_command)
534 : string_sprintf("Malformed SMTP reply in response to %s%s: %s",
535 pl, smtp_command, s);
538 case ERRNO_TLSFAILURE: /* Handle bad first read; can happen with
540 *message = US"bad first read from TLS conn";
543 case ERRNO_FILTER_FAIL: /* Handle a failed filter process error;
544 can't send QUIT as we mustn't end the DATA. */
545 *message = string_sprintf("transport filter process failed (%d)%s",
547 more_errno == EX_EXECFAILED ? ": unable to execute command" : "");
550 case ERRNO_CHHEADER_FAIL: /* Handle a failed add_headers expansion;
551 can't send QUIT as we mustn't end the DATA. */
553 string_sprintf("failed to expand headers_add or headers_remove: %s",
554 expand_string_message);
557 case ERRNO_WRITEINCOMPLETE: /* failure to write a complete data block */
558 *message = US"failed to write a data block";
562 case ERRNO_UTF8_FWD: /* no advertised SMTPUTF8, for international message */
563 *message = US"utf8 support required but not offered for forwarding";
564 DEBUG(D_deliver|D_transport) debug_printf("%s\n", *message);
569 /* Handle error responses from the remote mailer. */
573 *message = string_sprintf("SMTP error from remote mail server after %s%s: "
574 "%s", pl, smtp_command, s = string_printing(buffer));
575 *pass_message = TRUE;
580 /* No data was read. If there is no errno, this must be the EOF (i.e.
581 connection closed) case, which causes deferral. An explicit connection reset
582 error has the same effect. Otherwise, put the host's identity in the message,
583 leaving the errno value to be interpreted as well. In all cases, we have to
584 assume the connection is now dead. */
586 if (*errno_value == 0 || *errno_value == ECONNRESET)
588 *errno_value = ERRNO_SMTPCLOSED;
589 *message = US string_sprintf("Remote host closed connection "
590 "in response to %s%s", pl, smtp_command);
593 *message = US string_sprintf("%s [%s]", host->name, host->address);
600 /*************************************************
601 * Write error message to logs *
602 *************************************************/
604 /* This writes to the main log and to the message log.
607 host the current host
608 detail the current message (addr_item->message)
609 basic_errno the errno (addr_item->basic_errno)
615 write_logs(const host_item *host, const uschar *suffix, int basic_errno)
617 gstring * message = LOGGING(outgoing_port)
618 ? string_fmt_append(NULL, "H=%s [%s]:%d", host->name, host->address,
619 host->port == PORT_NONE ? 25 : host->port)
620 : string_fmt_append(NULL, "H=%s [%s]", host->name, host->address);
624 message = string_fmt_append(message, ": %s", suffix);
626 message = string_fmt_append(message, ": %s", strerror(basic_errno));
629 message = string_fmt_append(message, " %s", exim_errstr(basic_errno));
631 log_write(0, LOG_MAIN, "%s", string_from_gstring(message));
632 deliver_msglog("%s %s\n", tod_stamp(tod_log), message->s);
636 msglog_line(host_item * host, uschar * message)
638 deliver_msglog("%s H=%s [%s] %s\n", tod_stamp(tod_log),
639 host->name, host->address, message);
644 #ifndef DISABLE_EVENT
645 /*************************************************
646 * Post-defer action *
647 *************************************************/
649 /* This expands an arbitrary per-transport string.
650 It might, for example, be used to write to the database log.
653 addr the address item containing error information
654 host the current host
661 deferred_event_raise(address_item * addr, host_item * host, uschar * evstr)
663 uschar * action = addr->transport->event_action;
664 const uschar * save_domain;
670 save_domain = deliver_domain;
671 save_local = deliver_localpart;
673 /*XXX would ip & port already be set up? */
674 deliver_host_address = string_copy(host->address);
675 deliver_host_port = host->port == PORT_NONE ? 25 : host->port;
676 event_defer_errno = addr->basic_errno;
678 router_name = addr->router->name;
679 transport_name = addr->transport->name;
680 deliver_domain = addr->domain;
681 deliver_localpart = addr->local_part;
683 (void) event_raise(action, evstr,
685 ? addr->basic_errno > 0
686 ? string_sprintf("%s: %s", addr->message, strerror(addr->basic_errno))
687 : string_copy(addr->message)
688 : addr->basic_errno > 0
689 ? string_copy(US strerror(addr->basic_errno))
692 deliver_localpart = save_local;
693 deliver_domain = save_domain;
694 router_name = transport_name = NULL;
698 /*************************************************
699 * Reap SMTP specific responses *
700 *************************************************/
702 smtp_discard_responses(smtp_context * sx, smtp_transport_options_block * ob,
705 uschar flushbuffer[4096];
709 if (!smtp_read_response(sx, flushbuffer, sizeof(flushbuffer),
710 '2', ob->command_timeout)
711 && (errno != 0 || flushbuffer[0] == 0))
718 /* Return boolean success */
721 smtp_reap_banner(smtp_context * sx)
724 #if defined(__linux__) && defined(TCP_QUICKACK)
725 { /* Hack to get QUICKACK disabled; has to be right after 3whs, and has to on->off */
726 int sock = sx->cctx.sock;
727 struct pollfd p = {.fd = sock, .events = POLLOUT};
728 int rc = poll(&p, 1, 1000);
729 (void) setsockopt(sock, IPPROTO_TCP, TCP_QUICKACK, US &on, sizeof(on));
730 (void) setsockopt(sock, IPPROTO_TCP, TCP_QUICKACK, US &off, sizeof(off));
733 good_response = smtp_read_response(sx, sx->buffer, sizeof(sx->buffer),
734 '2', (SOB sx->conn_args.ob)->command_timeout);
735 #ifdef EXPERIMENTAL_DSN_INFO
736 sx->smtp_greeting = string_copy(sx->buffer);
738 return good_response;
742 smtp_reap_ehlo(smtp_context * sx)
744 if (!smtp_read_response(sx, sx->buffer, sizeof(sx->buffer), '2',
745 (SOB sx->conn_args.ob)->command_timeout))
747 if (errno != 0 || sx->buffer[0] == 0 || sx->lmtp)
749 #ifdef EXPERIMENTAL_DSN_INFO
750 sx->helo_response = string_copy(sx->buffer);
756 #ifdef EXPERIMENTAL_DSN_INFO
757 sx->helo_response = string_copy(sx->buffer);
759 #ifndef DISABLE_EVENT
760 (void) event_raise(sx->conn_args.tblock->event_action,
761 US"smtp:ehlo", sx->buffer);
767 /******************************************************************************/
769 #ifdef EXPERIMENTAL_ESMTP_LIMITS
770 /* If TLS, or TLS not offered, called with the EHLO response in the buffer.
771 Check it for a LIMITS keyword and parse values into the smtp context structure.
773 We don't bother with peers that we won't talk TLS to, even though they can,
774 just ignore their LIMITS advice (if any) and treat them as if they do not.
775 This saves us dealing with a duplicate set of values. */
778 ehlo_response_limits_read(smtp_context * sx)
780 int ovec[3]; /* results vector for a main-match only */
782 /* matches up to just after the first space after the keyword */
784 if (pcre_exec(regex_LIMITS, NULL, CS sx->buffer, Ustrlen(sx->buffer),
785 0, PCRE_EOPT, ovec, nelem(ovec)) >= 0)
786 for (const uschar * s = sx->buffer + ovec[1]; *s; )
788 while (isspace(*s)) s++;
789 if (*s == '\n') break;
791 if (strncmpic(s, US"MAILMAX=", 8) == 0)
793 sx->peer_limit_mail = atoi(CS (s += 8));
794 while (isdigit(*s)) s++;
796 else if (strncmpic(s, US"RCPTMAX=", 8) == 0)
798 sx->peer_limit_rcpt = atoi(CS (s += 8));
799 while (isdigit(*s)) s++;
801 else if (strncmpic(s, US"RCPTDOMAINMAX=", 14) == 0)
803 sx->peer_limit_rcptdom = atoi(CS (s += 14));
804 while (isdigit(*s)) s++;
807 while (*s && !isspace(*s)) s++;
811 /* Apply given values to the current connection */
813 ehlo_limits_apply(smtp_context * sx,
814 unsigned limit_mail, unsigned limit_rcpt, unsigned limit_rcptdom)
816 if (limit_mail && limit_mail < sx->max_mail) sx->max_mail = limit_mail;
817 if (limit_rcpt && limit_rcpt < sx->max_rcpt) sx->max_rcpt = limit_rcpt;
820 DEBUG(D_transport) debug_printf("will treat as !multi_domain\n");
821 sx->single_rcpt_domain = TRUE;
825 /* Apply values from EHLO-resp to the current connection */
827 ehlo_response_limits_apply(smtp_context * sx)
829 ehlo_limits_apply(sx, sx->peer_limit_mail, sx->peer_limit_rcpt,
830 sx->peer_limit_rcptdom);
833 /* Apply values read from cache to the current connection */
835 ehlo_cache_limits_apply(smtp_context * sx)
837 ehlo_limits_apply(sx, sx->ehlo_resp.limit_mail, sx->ehlo_resp.limit_rcpt,
838 sx->ehlo_resp.limit_rcptdom);
842 /******************************************************************************/
844 #ifndef DISABLE_PIPE_CONNECT
846 ehlo_cache_key(const smtp_context * sx)
848 host_item * host = sx->conn_args.host;
849 return Ustrchr(host->address, ':')
850 ? string_sprintf("[%s]:%d.EHLO", host->address,
851 host->port == PORT_NONE ? sx->port : host->port)
852 : string_sprintf("%s:%d.EHLO", host->address,
853 host->port == PORT_NONE ? sx->port : host->port);
856 /* Cache EHLO-response info for use by early-pipe.
858 - During a normal flow on EHLO response (either cleartext or under TLS),
859 when we are willing to do PIPE_CONNECT and it is offered
860 - During an early-pipe flow on receiving the actual EHLO response and noting
861 disparity versus the cached info used, when PIPE_CONNECT is still being offered
863 We assume that suitable values have been set in the sx.ehlo_resp structure for
864 features and auths; we handle the copy of limits. */
867 write_ehlo_cache_entry(smtp_context * sx)
869 open_db dbblock, * dbm_file;
871 #ifdef EXPERIMENTAL_ESMTP_LIMITS
872 sx->ehlo_resp.limit_mail = sx->peer_limit_mail;
873 sx->ehlo_resp.limit_rcpt = sx->peer_limit_rcpt;
874 sx->ehlo_resp.limit_rcptdom = sx->peer_limit_rcptdom;
877 if ((dbm_file = dbfn_open(US"misc", O_RDWR, &dbblock, TRUE, TRUE)))
879 uschar * ehlo_resp_key = ehlo_cache_key(sx);
880 dbdata_ehlo_resp er = { .data = sx->ehlo_resp };
883 #ifdef EXPERIMENTAL_ESMTP_LIMITS
884 if (sx->ehlo_resp.limit_mail || sx->ehlo_resp.limit_rcpt || sx->ehlo_resp.limit_rcptdom)
885 debug_printf("writing clr %04x/%04x cry %04x/%04x lim %05d/%05d/%05d\n",
886 sx->ehlo_resp.cleartext_features, sx->ehlo_resp.cleartext_auths,
887 sx->ehlo_resp.crypted_features, sx->ehlo_resp.crypted_auths,
888 sx->ehlo_resp.limit_mail, sx->ehlo_resp.limit_rcpt,
889 sx->ehlo_resp.limit_rcptdom);
892 debug_printf("writing clr %04x/%04x cry %04x/%04x\n",
893 sx->ehlo_resp.cleartext_features, sx->ehlo_resp.cleartext_auths,
894 sx->ehlo_resp.crypted_features, sx->ehlo_resp.crypted_auths);
896 dbfn_write(dbm_file, ehlo_resp_key, &er, (int)sizeof(er));
897 dbfn_close(dbm_file);
902 invalidate_ehlo_cache_entry(smtp_context * sx)
904 open_db dbblock, * dbm_file;
906 if ( sx->early_pipe_active
907 && (dbm_file = dbfn_open(US"misc", O_RDWR, &dbblock, TRUE, TRUE)))
909 uschar * ehlo_resp_key = ehlo_cache_key(sx);
910 dbfn_delete(dbm_file, ehlo_resp_key);
911 dbfn_close(dbm_file);
916 read_ehlo_cache_entry(smtp_context * sx)
921 if (!(dbm_file = dbfn_open(US"misc", O_RDONLY, &dbblock, FALSE, TRUE)))
922 { DEBUG(D_transport) debug_printf("ehlo-cache: no misc DB\n"); }
925 uschar * ehlo_resp_key = ehlo_cache_key(sx);
926 dbdata_ehlo_resp * er;
928 if (!(er = dbfn_read_enforce_length(dbm_file, ehlo_resp_key, sizeof(dbdata_ehlo_resp))))
929 { DEBUG(D_transport) debug_printf("no ehlo-resp record\n"); }
930 else if (time(NULL) - er->time_stamp > retry_data_expire)
932 DEBUG(D_transport) debug_printf("ehlo-resp record too old\n");
933 dbfn_close(dbm_file);
934 if ((dbm_file = dbfn_open(US"misc", O_RDWR, &dbblock, TRUE, TRUE)))
935 dbfn_delete(dbm_file, ehlo_resp_key);
940 #ifdef EXPERIMENTAL_ESMTP_LIMITS
941 if (er->data.limit_mail || er->data.limit_rcpt || er->data.limit_rcptdom)
942 debug_printf("EHLO response bits from cache:"
943 " cleartext 0x%04x/0x%04x crypted 0x%04x/0x%04x lim %05d/%05d/%05d\n",
944 er->data.cleartext_features, er->data.cleartext_auths,
945 er->data.crypted_features, er->data.crypted_auths,
946 er->data.limit_mail, er->data.limit_rcpt, er->data.limit_rcptdom);
949 debug_printf("EHLO response bits from cache:"
950 " cleartext 0x%04x/0x%04x crypted 0x%04x/0x%04x\n",
951 er->data.cleartext_features, er->data.cleartext_auths,
952 er->data.crypted_features, er->data.crypted_auths);
954 sx->ehlo_resp = er->data;
955 #ifdef EXPERIMENTAL_ESMTP_LIMITS
956 ehlo_cache_limits_apply(sx);
958 dbfn_close(dbm_file);
961 dbfn_close(dbm_file);
968 /* Return an auths bitmap for the set of AUTH methods offered by the server
969 which match our authenticators. */
971 static unsigned short
972 study_ehlo_auths(smtp_context * sx)
977 unsigned short authbits = 0;
979 if (!sx->esmtp) return 0;
980 if (!regex_AUTH) regex_AUTH = regex_must_compile(AUTHS_REGEX, FALSE, TRUE);
981 if (!regex_match_and_setup(regex_AUTH, sx->buffer, 0, -1)) return 0;
982 expand_nmax = -1; /* reset */
983 names = string_copyn(expand_nstring[1], expand_nlength[1]);
985 for (au = auths, authnum = 0; au; au = au->next, authnum++) if (au->client)
987 const uschar * list = names;
989 for (int sep = ' '; s = string_nextinlist(&list, &sep, NULL, 0); )
990 if (strcmpic(au->public_name, s) == 0)
991 { authbits |= BIT(authnum); break; }
995 debug_printf("server offers %s AUTH, methods '%s', bitmap 0x%04x\n",
996 tls_out.active.sock >= 0 ? "crypted" : "plaintext", names, authbits);
998 if (tls_out.active.sock >= 0)
999 sx->ehlo_resp.crypted_auths = authbits;
1001 sx->ehlo_resp.cleartext_auths = authbits;
1008 /* Wait for and check responses for early-pipelining.
1010 Called from the lower-level smtp_read_response() function
1011 used for general code that assume synchronisation, if context
1012 flags indicate outstanding early-pipelining commands. Also
1013 called fom sync_responses() which handles pipelined commands.
1016 sx smtp connection context
1017 countp number of outstanding responses, adjusted on return
1021 DEFER error on first read of TLS'd conn
1022 FAIL SMTP error in response
1025 smtp_reap_early_pipe(smtp_context * sx, int * countp)
1027 BOOL pending_BANNER = sx->pending_BANNER;
1028 BOOL pending_EHLO = sx->pending_EHLO;
1031 sx->pending_BANNER = FALSE; /* clear early to avoid recursion */
1032 sx->pending_EHLO = FALSE;
1036 DEBUG(D_transport) debug_printf("%s expect banner\n", __FUNCTION__);
1038 if (!smtp_reap_banner(sx))
1040 DEBUG(D_transport) debug_printf("bad banner\n");
1041 if (tls_out.active.sock >= 0) rc = DEFER;
1048 unsigned peer_offered;
1049 unsigned short authbits = 0, * ap;
1051 DEBUG(D_transport) debug_printf("%s expect ehlo\n", __FUNCTION__);
1053 if (!smtp_reap_ehlo(sx))
1055 DEBUG(D_transport) debug_printf("bad response for EHLO\n");
1056 if (tls_out.active.sock >= 0) rc = DEFER;
1060 /* Compare the actual EHLO response extensions and AUTH methods to the cached
1061 value we assumed; on difference, dump or rewrite the cache and arrange for a
1064 ap = tls_out.active.sock < 0
1065 ? &sx->ehlo_resp.cleartext_auths : &sx->ehlo_resp.crypted_auths;
1067 peer_offered = ehlo_response(sx->buffer,
1068 (tls_out.active.sock < 0 ? OPTION_TLS : 0)
1069 | OPTION_CHUNKING | OPTION_PRDR | OPTION_DSN | OPTION_PIPE | OPTION_SIZE
1070 | OPTION_UTF8 | OPTION_EARLY_PIPE
1072 #ifdef EXPERIMENTAL_ESMTP_LIMITS
1073 if (tls_out.active.sock >= 0 || !(peer_offered & OPTION_TLS))
1074 ehlo_response_limits_read(sx);
1076 if ( peer_offered != sx->peer_offered
1077 || (authbits = study_ehlo_auths(sx)) != *ap)
1080 debug_printf("EHLO %s extensions changed, 0x%04x/0x%04x -> 0x%04x/0x%04x\n",
1081 tls_out.active.sock < 0 ? "cleartext" : "crypted",
1082 sx->peer_offered, *ap, peer_offered, authbits);
1083 if (peer_offered & OPTION_EARLY_PIPE)
1085 *(tls_out.active.sock < 0
1086 ? &sx->ehlo_resp.cleartext_features : &sx->ehlo_resp.crypted_features) =
1089 write_ehlo_cache_entry(sx);
1092 invalidate_ehlo_cache_entry(sx);
1094 return OK; /* just carry on */
1096 #ifdef EXPERIMENTAL_ESMTP_LIMITS
1097 /* If we are handling LIMITS, compare the actual EHLO LIMITS values with the
1098 cached values and invalidate cache if different. OK to carry on with
1099 connect since values are advisory. */
1101 if ( (tls_out.active.sock >= 0 || !(peer_offered & OPTION_TLS))
1102 && ( sx->peer_limit_mail != sx->ehlo_resp.limit_mail
1103 || sx->peer_limit_rcpt != sx->ehlo_resp.limit_rcpt
1104 || sx->peer_limit_rcptdom != sx->ehlo_resp.limit_rcptdom
1109 debug_printf("EHLO LIMITS changed:");
1110 if (sx->peer_limit_mail != sx->ehlo_resp.limit_mail)
1111 debug_printf(" MAILMAX %u -> %u\n", sx->ehlo_resp.limit_mail, sx->peer_limit_mail);
1112 else if (sx->peer_limit_rcpt != sx->ehlo_resp.limit_rcpt)
1113 debug_printf(" RCPTMAX %u -> %u\n", sx->ehlo_resp.limit_rcpt, sx->peer_limit_rcpt);
1115 debug_printf(" RCPTDOMAINMAX %u -> %u\n", sx->ehlo_resp.limit_rcptdom, sx->peer_limit_rcptdom);
1117 invalidate_ehlo_cache_entry(sx);
1125 invalidate_ehlo_cache_entry(sx);
1126 (void) smtp_discard_responses(sx, sx->conn_args.ob, *countp);
1129 #endif /*!DISABLE_PIPE_CONNECT*/
1132 /*************************************************
1133 * Synchronize SMTP responses *
1134 *************************************************/
1136 /* This function is called from smtp_deliver() to receive SMTP responses from
1137 the server, and match them up with the commands to which they relate. When
1138 PIPELINING is not in use, this function is called after every command, and is
1139 therefore somewhat over-engineered, but it is simpler to use a single scheme
1140 that works both with and without PIPELINING instead of having two separate sets
1143 The set of commands that are buffered up with pipelining may start with MAIL
1144 and may end with DATA; in between are RCPT commands that correspond to the
1145 addresses whose status is PENDING_DEFER. All other commands (STARTTLS, AUTH,
1146 etc.) are never buffered.
1148 Errors after MAIL or DATA abort the whole process leaving the response in the
1149 buffer. After MAIL, pending responses are flushed, and the original command is
1150 re-instated in big_buffer for error messages. For RCPT commands, the remote is
1151 permitted to reject some recipient addresses while accepting others. However
1152 certain errors clearly abort the whole process. Set the value in
1153 transport_return to PENDING_OK if the address is accepted. If there is a
1154 subsequent general error, it will get reset accordingly. If not, it will get
1155 converted to OK at the end.
1158 sx smtp connection context
1159 count the number of responses to read
1160 pending_DATA 0 if last command sent was not DATA
1161 +1 if previously had a good recipient
1162 -1 if not previously had a good recipient
1164 Returns: 3 if at least one address had 2xx and one had 5xx
1165 2 if at least one address had 5xx but none had 2xx
1166 1 if at least one host had a 2xx response, but none had 5xx
1167 0 no address had 2xx or 5xx but no errors (all 4xx, or just DATA)
1168 -1 timeout while reading RCPT response
1169 -2 I/O or other non-response error for RCPT
1170 -3 DATA or MAIL failed - errno and buffer set
1171 -4 banner or EHLO failed (early-pipelining)
1172 -5 banner or EHLO failed (early-pipelining, TLS)
1176 sync_responses(smtp_context * sx, int count, int pending_DATA)
1178 address_item * addr = sx->sync_addr;
1179 smtp_transport_options_block * ob = sx->conn_args.ob;
1182 #ifndef DISABLE_PIPE_CONNECT
1184 if ((rc = smtp_reap_early_pipe(sx, &count)) != OK)
1185 return rc == FAIL ? -4 : -5;
1188 /* Handle the response for a MAIL command. On error, reinstate the original
1189 command in big_buffer for error message use, and flush any further pending
1190 responses before returning, except after I/O errors and timeouts. */
1192 if (sx->pending_MAIL)
1194 DEBUG(D_transport) debug_printf("%s expect mail\n", __FUNCTION__);
1196 sx->pending_MAIL = sx->RCPT_452 = FALSE;
1197 if (!smtp_read_response(sx, sx->buffer, sizeof(sx->buffer),
1198 '2', ob->command_timeout))
1200 DEBUG(D_transport) debug_printf("bad response for MAIL\n");
1201 Ustrcpy(big_buffer, mail_command); /* Fits, because it came from there! */
1202 if (errno == ERRNO_TLSFAILURE)
1204 if (errno == 0 && sx->buffer[0] != 0)
1207 if (sx->buffer[0] == '4')
1209 save_errno = ERRNO_MAIL4XX;
1210 addr->more_errno |= ((sx->buffer[1] - '0')*10 + sx->buffer[2] - '0') << 8;
1212 count = smtp_discard_responses(sx, ob, count);
1216 if (pending_DATA) count--; /* Number of RCPT responses to come */
1217 while (count-- > 0) /* Mark any pending addrs with the host used */
1219 while (addr->transport_return != PENDING_DEFER) addr = addr->next;
1220 addr->host_used = sx->conn_args.host;
1227 if (pending_DATA) count--; /* Number of RCPT responses to come */
1229 /* Read and handle the required number of RCPT responses, matching each one up
1230 with an address by scanning for the next address whose status is PENDING_DEFER.
1235 while (addr->transport_return != PENDING_DEFER)
1236 if (!(addr = addr->next))
1239 /* The address was accepted */
1240 addr->host_used = sx->conn_args.host;
1242 DEBUG(D_transport) debug_printf("%s expect rcpt for %s\n", __FUNCTION__, addr->address);
1243 if (smtp_read_response(sx, sx->buffer, sizeof(sx->buffer),
1244 '2', ob->command_timeout))
1247 addr->transport_return = PENDING_OK;
1249 /* If af_dr_retry_exists is set, there was a routing delay on this address;
1250 ensure that any address-specific retry record is expunged. We do this both
1251 for the basic key and for the version that also includes the sender. */
1253 if (testflag(addr, af_dr_retry_exists))
1255 uschar *altkey = string_sprintf("%s:<%s>", addr->address_retry_key,
1257 retry_add_item(addr, altkey, rf_delete);
1258 retry_add_item(addr, addr->address_retry_key, rf_delete);
1262 /* Error on first TLS read */
1264 else if (errno == ERRNO_TLSFAILURE)
1267 /* Timeout while reading the response */
1269 else if (errno == ETIMEDOUT)
1271 uschar *message = string_sprintf("SMTP timeout after RCPT TO:<%s>",
1272 transport_rcpt_address(addr, sx->conn_args.tblock->rcpt_include_affixes));
1273 set_errno_nohost(sx->first_addr, ETIMEDOUT, message, DEFER, FALSE, &sx->delivery_start);
1274 retry_add_item(addr, addr->address_retry_key, 0);
1275 update_waiting = FALSE;
1279 /* Handle other errors in obtaining an SMTP response by returning -1. This
1280 will cause all the addresses to be deferred. Restore the SMTP command in
1281 big_buffer for which we are checking the response, so the error message
1284 else if (errno != 0 || sx->buffer[0] == 0)
1286 gstring gs = { .size = big_buffer_size, .ptr = 0, .s = big_buffer }, * g = &gs;
1288 /* Use taint-unchecked routines for writing into big_buffer, trusting
1289 that we'll never expand it. */
1291 g = string_fmt_append_f(g, SVFMT_TAINT_NOCHK, "RCPT TO:<%s>",
1292 transport_rcpt_address(addr, sx->conn_args.tblock->rcpt_include_affixes));
1293 string_from_gstring(g);
1297 /* Handle SMTP permanent and temporary response codes. */
1302 string_sprintf("SMTP error from remote mail server after RCPT TO:<%s>: "
1303 "%s", transport_rcpt_address(addr, sx->conn_args.tblock->rcpt_include_affixes),
1304 string_printing(sx->buffer));
1305 setflag(addr, af_pass_message);
1307 msglog_line(sx->conn_args.host, addr->message);
1309 /* The response was 5xx */
1311 if (sx->buffer[0] == '5')
1313 addr->transport_return = FAIL;
1317 /* The response was 4xx */
1321 addr->transport_return = DEFER;
1322 addr->basic_errno = ERRNO_RCPT4XX;
1323 addr->more_errno |= ((sx->buffer[1] - '0')*10 + sx->buffer[2] - '0') << 8;
1327 #ifndef DISABLE_EVENT
1328 event_defer_errno = addr->more_errno;
1329 msg_event_raise(US"msg:rcpt:host:defer", addr);
1331 /* If a 452 and we've had at least one 2xx or 5xx, set next_addr to the
1332 start point for another MAIL command. */
1334 if (addr->more_errno >> 8 == 52 && yield & 3)
1336 if (!sx->RCPT_452) /* initialised at MAIL-ack above */
1339 debug_printf("%s: seen first 452 too-many-rcpts\n", __FUNCTION__);
1340 sx->RCPT_452 = TRUE;
1341 sx->next_addr = addr;
1343 addr->transport_return = PENDING_DEFER;
1344 addr->basic_errno = 0;
1348 /* Log temporary errors if there are more hosts to be tried.
1349 If not, log this last one in the == line. */
1351 if (sx->conn_args.host->next)
1352 if (LOGGING(outgoing_port))
1353 log_write(0, LOG_MAIN, "H=%s [%s]:%d %s", sx->conn_args.host->name,
1354 sx->conn_args.host->address,
1355 sx->port == PORT_NONE ? 25 : sx->port, addr->message);
1357 log_write(0, LOG_MAIN, "H=%s [%s]: %s", sx->conn_args.host->name,
1358 sx->conn_args.host->address, addr->message);
1360 #ifndef DISABLE_EVENT
1362 msg_event_raise(US"msg:rcpt:defer", addr);
1365 /* Do not put this message on the list of those waiting for specific
1366 hosts, as otherwise it is likely to be tried too often. */
1368 update_waiting = FALSE;
1370 /* Add a retry item for the address so that it doesn't get tried again
1371 too soon. If address_retry_include_sender is true, add the sender address
1372 to the retry key. */
1374 retry_add_item(addr,
1375 ob->address_retry_include_sender
1376 ? string_sprintf("%s:<%s>", addr->address_retry_key, sender_address)
1377 : addr->address_retry_key,
1383 if (count && !(addr = addr->next))
1385 } /* Loop for next RCPT response */
1387 /* Update where to start at for the next block of responses, unless we
1388 have already handled all the addresses. */
1390 if (addr) sx->sync_addr = addr->next;
1392 /* Handle a response to DATA. If we have not had any good recipients, either
1393 previously or in this block, the response is ignored. */
1395 if (pending_DATA != 0)
1397 DEBUG(D_transport) debug_printf("%s expect data\n", __FUNCTION__);
1398 if (!smtp_read_response(sx, sx->buffer, sizeof(sx->buffer),
1399 '3', ob->command_timeout))
1405 if (errno == ERRNO_TLSFAILURE) /* Error on first TLS read */
1408 if (pending_DATA > 0 || (yield & 1) != 0)
1410 if (errno == 0 && sx->buffer[0] == '4')
1412 errno = ERRNO_DATA4XX;
1413 sx->first_addr->more_errno |= ((sx->buffer[1] - '0')*10 + sx->buffer[2] - '0') << 8;
1417 (void)check_response(sx->conn_args.host, &errno, 0, sx->buffer, &code, &msg, &pass_message);
1418 DEBUG(D_transport) debug_printf("%s\nerror for DATA ignored: pipelining "
1419 "is in use and there were no good recipients\n", msg);
1423 /* All responses read and handled; MAIL (if present) received 2xx and DATA (if
1424 present) received 3xx. If any RCPTs were handled and yielded anything other
1425 than 4xx, yield will be set non-zero. */
1434 /* Try an authenticator's client entry */
1437 try_authenticator(smtp_context * sx, auth_instance * au)
1439 smtp_transport_options_block * ob = sx->conn_args.ob; /* transport options */
1440 host_item * host = sx->conn_args.host; /* host to deliver to */
1443 sx->outblock.authenticating = TRUE;
1444 rc = (au->info->clientcode)(au, sx, ob->command_timeout,
1445 sx->buffer, sizeof(sx->buffer));
1446 sx->outblock.authenticating = FALSE;
1447 DEBUG(D_transport) debug_printf("%s authenticator yielded %d\n", au->name, rc);
1449 /* A temporary authentication failure must hold up delivery to
1450 this host. After a permanent authentication failure, we carry on
1451 to try other authentication methods. If all fail hard, try to
1452 deliver the message unauthenticated unless require_auth was set. */
1457 f.smtp_authenticated = TRUE; /* stops the outer loop */
1458 client_authenticator = au->name;
1459 if (au->set_client_id)
1460 client_authenticated_id = expand_string(au->set_client_id);
1463 /* Failure after writing a command */
1468 /* Failure after reading a response */
1471 if (errno != 0 || sx->buffer[0] != '5') return FAIL;
1472 log_write(0, LOG_MAIN, "%s authenticator failed H=%s [%s] %s",
1473 au->name, host->name, host->address, sx->buffer);
1476 /* Failure by some other means. In effect, the authenticator
1477 decided it wasn't prepared to handle this case. Typically this
1478 is the result of "fail" in an expansion string. Do we need to
1479 log anything here? Feb 2006: a message is now put in the buffer
1480 if logging is required. */
1483 if (*sx->buffer != 0)
1484 log_write(0, LOG_MAIN, "%s authenticator cancelled "
1485 "authentication H=%s [%s] %s", au->name, host->name,
1486 host->address, sx->buffer);
1489 /* Internal problem, message in buffer. */
1492 set_errno_nohost(sx->addrlist, ERRNO_AUTHPROB, string_copy(sx->buffer),
1493 DEFER, FALSE, &sx->delivery_start);
1502 /* Do the client side of smtp-level authentication.
1505 sx smtp connection context
1507 sx->buffer should have the EHLO response from server (gets overwritten)
1510 OK Success, or failed (but not required): global "smtp_authenticated" set
1511 DEFER Failed authentication (and was required)
1512 ERROR Internal problem
1514 FAIL_SEND Failed communications - transmit
1519 smtp_auth(smtp_context * sx)
1521 host_item * host = sx->conn_args.host; /* host to deliver to */
1522 smtp_transport_options_block * ob = sx->conn_args.ob; /* transport options */
1523 int require_auth = verify_check_given_host(CUSS &ob->hosts_require_auth, host);
1524 #ifndef DISABLE_PIPE_CONNECT
1525 unsigned short authbits = tls_out.active.sock >= 0
1526 ? sx->ehlo_resp.crypted_auths : sx->ehlo_resp.cleartext_auths;
1528 uschar * fail_reason = US"server did not advertise AUTH support";
1530 f.smtp_authenticated = FALSE;
1531 client_authenticator = client_authenticated_id = client_authenticated_sender = NULL;
1534 regex_AUTH = regex_must_compile(AUTHS_REGEX, FALSE, TRUE);
1536 /* Is the server offering AUTH? */
1540 #ifndef DISABLE_PIPE_CONNECT
1541 sx->early_pipe_active ? authbits
1544 regex_match_and_setup(regex_AUTH, sx->buffer, 0, -1)
1547 uschar * names = NULL;
1548 expand_nmax = -1; /* reset */
1550 #ifndef DISABLE_PIPE_CONNECT
1551 if (!sx->early_pipe_active)
1553 names = string_copyn(expand_nstring[1], expand_nlength[1]);
1555 /* Must not do this check until after we have saved the result of the
1556 regex match above as the check could be another RE. */
1558 if ( require_auth == OK
1559 || verify_check_given_host(CUSS &ob->hosts_try_auth, host) == OK)
1561 DEBUG(D_transport) debug_printf("scanning authentication mechanisms\n");
1562 fail_reason = US"no common mechanisms were found";
1564 #ifndef DISABLE_PIPE_CONNECT
1565 if (sx->early_pipe_active)
1567 /* Scan our authenticators (which support use by a client and were offered
1568 by the server (checked at cache-write time)), not suppressed by
1569 client_condition. If one is found, attempt to authenticate by calling its
1570 client function. We are limited to supporting up to 16 authenticator
1571 public-names by the number of bits in a short. */
1577 for (bitnum = 0, au = auths;
1578 !f.smtp_authenticated && au && bitnum < 16;
1579 bitnum++, au = au->next) if (authbits & BIT(bitnum))
1581 if ( au->client_condition
1582 && !expand_check_condition(au->client_condition, au->name,
1583 US"client authenticator"))
1585 DEBUG(D_transport) debug_printf("skipping %s authenticator: %s\n",
1586 au->name, "client_condition is false");
1590 /* Found data for a listed mechanism. Call its client entry. Set
1591 a flag in the outblock so that data is overwritten after sending so
1592 that reflections don't show it. */
1594 fail_reason = US"authentication attempt(s) failed";
1596 if ((rc = try_authenticator(sx, au)) != OK)
1603 /* Scan the configured authenticators looking for one which is configured
1604 for use as a client, which is not suppressed by client_condition, and
1605 whose name matches an authentication mechanism supported by the server.
1606 If one is found, attempt to authenticate by calling its client function.
1609 for (auth_instance * au = auths; !f.smtp_authenticated && au; au = au->next)
1614 || ( au->client_condition
1615 && !expand_check_condition(au->client_condition, au->name,
1616 US"client authenticator")))
1618 DEBUG(D_transport) debug_printf("skipping %s authenticator: %s\n",
1620 (au->client)? "client_condition is false" :
1621 "not configured as a client");
1625 /* Loop to scan supported server mechanisms */
1629 int len = Ustrlen(au->public_name);
1632 while (isspace(*p)) p++;
1634 if (strncmpic(au->public_name, p, len) != 0 ||
1635 (p[len] != 0 && !isspace(p[len])))
1637 while (*p != 0 && !isspace(*p)) p++;
1641 /* Found data for a listed mechanism. Call its client entry. Set
1642 a flag in the outblock so that data is overwritten after sending so
1643 that reflections don't show it. */
1645 fail_reason = US"authentication attempt(s) failed";
1647 if ((rc = try_authenticator(sx, au)) != OK)
1650 break; /* If not authenticated, try next authenticator */
1651 } /* Loop for scanning supported server mechanisms */
1652 } /* Loop for further authenticators */
1656 /* If we haven't authenticated, but are required to, give up. */
1658 if (require_auth == OK && !f.smtp_authenticated)
1660 #ifndef DISABLE_PIPE_CONNECT
1661 invalidate_ehlo_cache_entry(sx);
1663 set_errno_nohost(sx->addrlist, ERRNO_AUTHFAIL,
1664 string_sprintf("authentication required but %s", fail_reason), DEFER,
1665 FALSE, &sx->delivery_start);
1673 /* Construct AUTH appendix string for MAIL TO */
1676 sx context for smtp connection
1677 p point in sx->buffer to build string
1678 addrlist chain of potential addresses to deliver
1680 Globals f.smtp_authenticated
1681 client_authenticated_sender
1682 Return True on error, otherwise buffer has (possibly empty) terminated string
1686 smtp_mail_auth_str(smtp_context * sx, uschar * p, address_item * addrlist)
1688 smtp_transport_options_block * ob = sx->conn_args.ob;
1689 uschar * local_authenticated_sender = authenticated_sender;
1692 debug_printf("smtp_mail_auth_str: as<%s> os<%s> SA<%s>\n",
1693 authenticated_sender, ob->authenticated_sender, f.smtp_authenticated?"Y":"N");
1696 if (ob->authenticated_sender)
1698 uschar * new = expand_string(ob->authenticated_sender);
1701 if (!f.expand_string_forcedfail)
1703 uschar *message = string_sprintf("failed to expand "
1704 "authenticated_sender: %s", expand_string_message);
1705 set_errno_nohost(addrlist, ERRNO_EXPANDFAIL, message, DEFER, FALSE, &sx->delivery_start);
1710 local_authenticated_sender = new;
1713 /* Add the authenticated sender address if present */
1715 if ( (f.smtp_authenticated || ob->authenticated_sender_force)
1716 && local_authenticated_sender)
1718 string_format_nt(p, sizeof(sx->buffer) - (p-sx->buffer), " AUTH=%s",
1719 auth_xtextencode(local_authenticated_sender,
1720 Ustrlen(local_authenticated_sender)));
1721 client_authenticated_sender = string_copy(local_authenticated_sender);
1731 typedef struct smtp_compare_s
1733 uschar * current_sender_address;
1734 struct transport_instance * tblock;
1738 /* Create a unique string that identifies this message, it is based on
1739 sender_address, helo_data and tls_certificate if enabled.
1743 smtp_local_identity(uschar * sender, struct transport_instance * tblock)
1745 address_item * addr1;
1746 uschar * if1 = US"";
1747 uschar * helo1 = US"";
1749 uschar * tlsc1 = US"";
1751 uschar * save_sender_address = sender_address;
1752 uschar * local_identity = NULL;
1753 smtp_transport_options_block * ob = SOB tblock->options_block;
1755 sender_address = sender;
1757 addr1 = deliver_make_addr (sender, TRUE);
1758 deliver_set_expansions(addr1);
1761 if1 = expand_string(ob->interface);
1764 helo1 = expand_string(ob->helo_data);
1767 if (ob->tls_certificate)
1768 tlsc1 = expand_string(ob->tls_certificate);
1769 local_identity = string_sprintf ("%s^%s^%s", if1, helo1, tlsc1);
1771 local_identity = string_sprintf ("%s^%s", if1, helo1);
1774 deliver_set_expansions(NULL);
1775 sender_address = save_sender_address;
1777 return local_identity;
1782 /* This routine is a callback that is called from transport_check_waiting.
1783 This function will evaluate the incoming message versus the previous
1784 message. If the incoming message is using a different local identity then
1785 we will veto this new message. */
1788 smtp_are_same_identities(uschar * message_id, smtp_compare_t * s_compare)
1790 uschar * message_local_identity,
1791 * current_local_identity,
1792 * new_sender_address;
1794 current_local_identity =
1795 smtp_local_identity(s_compare->current_sender_address, s_compare->tblock);
1797 if (!(new_sender_address = spool_sender_from_msgid(message_id)))
1801 message_local_identity =
1802 smtp_local_identity(new_sender_address, s_compare->tblock);
1804 return Ustrcmp(current_local_identity, message_local_identity) == 0;
1810 ehlo_response(uschar * buf, unsigned checks)
1812 size_t bsize = Ustrlen(buf);
1814 /* debug_printf("%s: check for 0x%04x\n", __FUNCTION__, checks); */
1817 if ( checks & OPTION_TLS
1818 && pcre_exec(regex_STARTTLS, NULL, CS buf, bsize, 0, PCRE_EOPT, NULL, 0) < 0)
1820 checks &= ~OPTION_TLS;
1822 if ( checks & OPTION_IGNQ
1823 && pcre_exec(regex_IGNOREQUOTA, NULL, CS buf, bsize, 0,
1824 PCRE_EOPT, NULL, 0) < 0)
1825 checks &= ~OPTION_IGNQ;
1827 if ( checks & OPTION_CHUNKING
1828 && pcre_exec(regex_CHUNKING, NULL, CS buf, bsize, 0, PCRE_EOPT, NULL, 0) < 0)
1829 checks &= ~OPTION_CHUNKING;
1831 #ifndef DISABLE_PRDR
1832 if ( checks & OPTION_PRDR
1833 && pcre_exec(regex_PRDR, NULL, CS buf, bsize, 0, PCRE_EOPT, NULL, 0) < 0)
1835 checks &= ~OPTION_PRDR;
1838 if ( checks & OPTION_UTF8
1839 && pcre_exec(regex_UTF8, NULL, CS buf, bsize, 0, PCRE_EOPT, NULL, 0) < 0)
1841 checks &= ~OPTION_UTF8;
1843 if ( checks & OPTION_DSN
1844 && pcre_exec(regex_DSN, NULL, CS buf, bsize, 0, PCRE_EOPT, NULL, 0) < 0)
1845 checks &= ~OPTION_DSN;
1847 if ( checks & OPTION_PIPE
1848 && pcre_exec(regex_PIPELINING, NULL, CS buf, bsize, 0,
1849 PCRE_EOPT, NULL, 0) < 0)
1850 checks &= ~OPTION_PIPE;
1852 if ( checks & OPTION_SIZE
1853 && pcre_exec(regex_SIZE, NULL, CS buf, bsize, 0, PCRE_EOPT, NULL, 0) < 0)
1854 checks &= ~OPTION_SIZE;
1856 #ifndef DISABLE_PIPE_CONNECT
1857 if ( checks & OPTION_EARLY_PIPE
1858 && pcre_exec(regex_EARLY_PIPE, NULL, CS buf, bsize, 0,
1859 PCRE_EOPT, NULL, 0) < 0)
1861 checks &= ~OPTION_EARLY_PIPE;
1863 /* debug_printf("%s: found 0x%04x\n", __FUNCTION__, checks); */
1869 /* Callback for emitting a BDAT data chunk header.
1871 If given a nonzero size, first flush any buffered SMTP commands
1872 then emit the command.
1874 Reap previous SMTP command responses if requested, and always reap
1875 the response from a previous BDAT command.
1878 tctx transport context
1879 chunk_size value for SMTP BDAT command
1881 tc_chunk_last add LAST option to SMTP BDAT command
1882 tc_reap_prev reap response to previous SMTP commands
1886 DEFER TLS error on first read (EHLO-resp); errno set
1890 smtp_chunk_cmd_callback(transport_ctx * tctx, unsigned chunk_size,
1893 smtp_transport_options_block * ob = SOB tctx->tblock->options_block;
1894 smtp_context * sx = tctx->smtp_context;
1898 /* Write SMTP chunk header command. If not reaping responses, note that
1899 there may be more writes (like, the chunk data) done soon. */
1903 #ifndef DISABLE_PIPE_CONNECT
1904 BOOL new_conn = !!(sx->outblock.conn_args);
1906 if((cmd_count = smtp_write_command(sx,
1907 flags & tc_reap_prev ? SCMD_FLUSH : SCMD_MORE,
1908 "BDAT %u%s\r\n", chunk_size, flags & tc_chunk_last ? " LAST" : "")
1909 ) < 0) return ERROR;
1910 if (flags & tc_chunk_last)
1911 data_command = string_copy(big_buffer); /* Save for later error message */
1912 #ifndef DISABLE_PIPE_CONNECT
1913 /* That command write could have been the one that made the connection.
1914 Copy the fd from the client conn ctx (smtp transport specific) to the
1915 generic transport ctx. */
1918 tctx->u.fd = sx->outblock.cctx->sock;
1922 prev_cmd_count = cmd_count += sx->cmd_count;
1924 /* Reap responses for any previous, but not one we just emitted */
1928 if (sx->pending_BDAT)
1931 if (flags & tc_reap_prev && prev_cmd_count > 0)
1933 DEBUG(D_transport) debug_printf("look for %d responses"
1934 " for previous pipelined cmds\n", prev_cmd_count);
1936 switch(sync_responses(sx, prev_cmd_count, 0))
1938 case 1: /* 2xx (only) => OK */
1939 case 3: sx->good_RCPT = TRUE; /* 2xx & 5xx => OK & progress made */
1940 case 2: sx->completed_addr = TRUE; /* 5xx (only) => progress made */
1941 case 0: break; /* No 2xx or 5xx, but no probs */
1943 case -5: errno = ERRNO_TLSFAILURE;
1945 #ifndef DISABLE_PIPE_CONNECT
1946 case -4: /* non-2xx for pipelined banner or EHLO */
1948 case -1: /* Timeout on RCPT */
1949 default: return ERROR; /* I/O error, or any MAIL/DATA error */
1952 if (!sx->pending_BDAT)
1953 pipelining_active = FALSE;
1956 /* Reap response for an outstanding BDAT */
1958 if (sx->pending_BDAT)
1960 DEBUG(D_transport) debug_printf("look for one response for BDAT\n");
1962 if (!smtp_read_response(sx, sx->buffer, sizeof(sx->buffer), '2',
1963 ob->command_timeout))
1965 if (errno == 0 && sx->buffer[0] == '4')
1967 errno = ERRNO_DATA4XX; /*XXX does this actually get used? */
1968 sx->addrlist->more_errno |=
1969 ((sx->buffer[1] - '0')*10 + sx->buffer[2] - '0') << 8;
1974 sx->pending_BDAT = FALSE;
1975 pipelining_active = FALSE;
1977 else if (chunk_size > 0)
1978 sx->pending_BDAT = TRUE;
1981 sx->cmd_count = cmd_count;
1987 /*************************************************
1988 * Make connection for given message *
1989 *************************************************/
1993 sx connection context
1994 suppress_tls if TRUE, don't attempt a TLS connection - this is set for
1995 a second attempt after TLS initialization fails
1997 Returns: OK - the connection was made and the delivery attempted;
1998 fd is set in the conn context, tls_out set up.
1999 DEFER - the connection could not be made, or something failed
2000 while setting up the SMTP session, or there was a
2001 non-message-specific error, such as a timeout.
2002 ERROR - helo_data or add_headers or authenticated_sender is
2003 specified for this transport, and the string failed
2007 smtp_setup_conn(smtp_context * sx, BOOL suppress_tls)
2009 smtp_transport_options_block * ob = sx->conn_args.tblock->options_block;
2010 BOOL pass_message = FALSE;
2011 uschar * message = NULL;
2014 uschar * tls_errstr;
2017 sx->conn_args.ob = ob;
2019 sx->lmtp = strcmpic(ob->protocol, US"lmtp") == 0;
2020 sx->smtps = strcmpic(ob->protocol, US"smtps") == 0;
2021 /* sx->ok = FALSE; */
2022 sx->send_rset = TRUE;
2023 sx->send_quit = TRUE;
2024 sx->setting_up = TRUE;
2026 /* sx->esmtp_sent = FALSE; */
2028 /* sx->utf8_needed = FALSE; */
2030 sx->dsn_all_lasthop = TRUE;
2032 /* sx->conn_args.dane = FALSE; */
2034 verify_check_given_host(CUSS &ob->hosts_require_dane, sx->conn_args.host) == OK;
2036 #ifndef DISABLE_PIPE_CONNECT
2037 /* sx->early_pipe_active = sx->early_pipe_ok = FALSE; */
2038 /* sx->ehlo_resp.cleartext_features = sx->ehlo_resp.crypted_features = 0; */
2039 /* sx->pending_BANNER = sx->pending_EHLO = sx->pending_MAIL = FALSE; */
2042 if ((sx->max_mail = sx->conn_args.tblock->connection_max_messages) == 0) sx->max_mail = 999999;
2043 if ((sx->max_rcpt = sx->conn_args.tblock->max_addresses) == 0) sx->max_rcpt = 999999;
2044 /* sx->peer_offered = 0; */
2045 /* sx->avoid_option = 0; */
2046 sx->igquotstr = US"";
2047 if (!sx->helo_data) sx->helo_data = ob->helo_data;
2048 #ifdef EXPERIMENTAL_DSN_INFO
2049 /* sx->smtp_greeting = NULL; */
2050 /* sx->helo_response = NULL; */
2053 smtp_command = US"initial connection";
2054 /* sx->buffer[0] = '\0'; */
2056 /* Set up the buffer for reading SMTP response packets. */
2058 sx->inblock.buffer = sx->inbuffer;
2059 sx->inblock.buffersize = sizeof(sx->inbuffer);
2060 sx->inblock.ptr = sx->inbuffer;
2061 sx->inblock.ptrend = sx->inbuffer;
2063 /* Set up the buffer for holding SMTP commands while pipelining */
2065 sx->outblock.buffer = sx->outbuffer;
2066 sx->outblock.buffersize = sizeof(sx->outbuffer);
2067 sx->outblock.ptr = sx->outbuffer;
2068 /* sx->outblock.cmd_count = 0; */
2069 /* sx->outblock.authenticating = FALSE; */
2070 /* sx->outblock.conn_args = NULL; */
2072 /* Reset the parameters of a TLS session. */
2075 tls_out.cipher = NULL; /* the one we may use for this transport */
2076 tls_out.ourcert = NULL;
2077 tls_out.peercert = NULL;
2078 tls_out.peerdn = NULL;
2082 tls_out.ocsp = OCSP_NOT_REQ;
2083 #ifndef DISABLE_TLS_RESUME
2084 tls_out.resumption = 0;
2088 /* Flip the legacy TLS-related variables over to the outbound set in case
2089 they're used in the context of the transport. Don't bother resetting
2090 afterward (when being used by a transport) as we're in a subprocess.
2091 For verify, unflipped once the callout is dealt with */
2093 tls_modify_variables(&tls_out);
2098 set_errno_nohost(sx->addrlist, ERRNO_TLSFAILURE, US"TLS support not available",
2099 DEFER, FALSE, &sx->delivery_start);
2104 /* If we have a proxied TLS connection, check usability for this message */
2106 if (continue_hostname && continue_proxy_cipher)
2109 const uschar * sni = US"";
2111 # ifdef SUPPORT_DANE
2112 /* Check if the message will be DANE-verified; if so force its SNI */
2114 tls_out.dane_verified = FALSE;
2115 smtp_port_for_connect(sx->conn_args.host, sx->port);
2116 if ( sx->conn_args.host->dnssec == DS_YES
2117 && ( sx->dane_required
2118 || verify_check_given_host(CUSS &ob->hosts_try_dane, sx->conn_args.host) == OK
2120 switch (rc = tlsa_lookup(sx->conn_args.host, &sx->conn_args.tlsa_dnsa, sx->dane_required))
2122 case OK: sx->conn_args.dane = TRUE;
2123 ob->tls_tempfail_tryclear = FALSE; /* force TLS */
2124 ob->tls_sni = sx->conn_args.host->name; /* force SNI */
2126 case FAIL_FORCED: break;
2127 default: set_errno_nohost(sx->addrlist, ERRNO_DNSDEFER,
2128 string_sprintf("DANE error: tlsa lookup %s",
2130 rc, FALSE, &sx->delivery_start);
2131 # ifndef DISABLE_EVENT
2132 (void) event_raise(sx->conn_args.tblock->event_action,
2133 US"dane:fail", sx->dane_required
2134 ? US"dane-required" : US"dnssec-invalid");
2140 /* If the SNI or the DANE status required for the new message differs from the
2141 existing conn drop the connection to force a new one. */
2143 if (ob->tls_sni && !(sni = expand_cstring(ob->tls_sni)))
2144 log_write(0, LOG_MAIN|LOG_PANIC,
2145 "<%s>: failed to expand transport's tls_sni value: %s",
2146 sx->addrlist->address, expand_string_message);
2148 # ifdef SUPPORT_DANE
2149 if ( (continue_proxy_sni ? (Ustrcmp(continue_proxy_sni, sni) == 0) : !*sni)
2150 && continue_proxy_dane == sx->conn_args.dane)
2152 tls_out.sni = US sni;
2153 if ((tls_out.dane_verified = continue_proxy_dane))
2154 sx->conn_args.host->dnssec = DS_YES;
2157 if ((continue_proxy_sni ? (Ustrcmp(continue_proxy_sni, sni) == 0) : !*sni))
2158 tls_out.sni = US sni;
2163 debug_printf("Closing proxied-TLS connection due to SNI mismatch\n");
2165 HDEBUG(D_transport|D_acl|D_v) debug_printf_indent(" SMTP>> QUIT\n");
2166 write(0, "QUIT\r\n", 6);
2168 continue_hostname = continue_proxy_cipher = NULL;
2169 f.continue_more = FALSE;
2170 continue_sequence = 1; /* Unfortunately, this process cannot affect success log
2171 which is done by delivery proc. Would have to pass this
2172 back through reporting pipe. */
2175 #endif /*!DISABLE_TLS*/
2177 /* Make a connection to the host if this isn't a continued delivery, and handle
2178 the initial interaction and HELO/EHLO/LHLO. Connect timeout errors are handled
2179 specially so they can be identified for retries. */
2181 if (!continue_hostname)
2184 HDEBUG(D_verify) debug_printf("interface=%s port=%d\n", sx->conn_args.interface, sx->port);
2186 /* Arrange to report to calling process this is a new connection */
2188 clearflag(sx->first_addr, af_cont_conn);
2189 setflag(sx->first_addr, af_new_conn);
2191 /* Get the actual port the connection will use, into sx->conn_args.host */
2193 smtp_port_for_connect(sx->conn_args.host, sx->port);
2196 /* Do TLSA lookup for DANE */
2198 tls_out.dane_verified = FALSE;
2199 tls_out.tlsa_usage = 0;
2201 if (sx->conn_args.host->dnssec == DS_YES)
2204 if( sx->dane_required
2205 || verify_check_given_host(CUSS &ob->hosts_try_dane, sx->conn_args.host) == OK
2207 switch (rc = tlsa_lookup(sx->conn_args.host, &sx->conn_args.tlsa_dnsa, sx->dane_required))
2209 case OK: sx->conn_args.dane = TRUE;
2210 ob->tls_tempfail_tryclear = FALSE; /* force TLS */
2211 ob->tls_sni = sx->conn_args.host->name; /* force SNI */
2213 case FAIL_FORCED: break;
2214 default: set_errno_nohost(sx->addrlist, ERRNO_DNSDEFER,
2215 string_sprintf("DANE error: tlsa lookup %s",
2217 rc, FALSE, &sx->delivery_start);
2218 # ifndef DISABLE_EVENT
2219 (void) event_raise(sx->conn_args.tblock->event_action,
2220 US"dane:fail", sx->dane_required
2221 ? US"dane-required" : US"dnssec-invalid");
2226 else if (sx->dane_required)
2228 set_errno_nohost(sx->addrlist, ERRNO_DNSDEFER,
2229 string_sprintf("DANE error: %s lookup not DNSSEC", sx->conn_args.host->name),
2230 FAIL, FALSE, &sx->delivery_start);
2231 # ifndef DISABLE_EVENT
2232 (void) event_raise(sx->conn_args.tblock->event_action,
2233 US"dane:fail", US"dane-required");
2240 /* Make the TCP connection */
2242 sx->cctx.tls_ctx = NULL;
2243 sx->inblock.cctx = sx->outblock.cctx = &sx->cctx;
2244 #ifdef EXPERIMENTAL_ESMTP_LIMITS
2245 sx->peer_limit_mail = sx->peer_limit_rcpt = sx->peer_limit_rcptdom =
2247 sx->avoid_option = sx->peer_offered = smtp_peer_options = 0;
2249 #ifndef DISABLE_PIPE_CONNECT
2250 if ( verify_check_given_host(CUSS &ob->hosts_pipe_connect,
2251 sx->conn_args.host) == OK)
2253 /* We don't find out the local ip address until the connect, so if
2254 the helo string might use it avoid doing early-pipelining. */
2257 || !Ustrstr(sx->helo_data, "$sending_ip_address")
2258 || Ustrstr(sx->helo_data, "def:sending_ip_address")
2261 sx->early_pipe_ok = TRUE;
2262 if ( read_ehlo_cache_entry(sx)
2263 && sx->ehlo_resp.cleartext_features & OPTION_EARLY_PIPE)
2266 debug_printf("Using cached cleartext PIPE_CONNECT\n");
2267 sx->early_pipe_active = TRUE;
2268 sx->peer_offered = sx->ehlo_resp.cleartext_features;
2271 else DEBUG(D_transport)
2272 debug_printf("helo needs $sending_ip_address\n");
2275 if (sx->early_pipe_active)
2276 sx->outblock.conn_args = &sx->conn_args;
2280 blob lazy_conn = {.data = NULL};
2281 /* For TLS-connect, a TFO lazy-connect is useful since the Client Hello
2282 can go on the TCP SYN. */
2284 if ((sx->cctx.sock = smtp_connect(&sx->conn_args,
2285 sx->smtps ? &lazy_conn : NULL)) < 0)
2287 set_errno_nohost(sx->addrlist,
2288 errno == ETIMEDOUT ? ERRNO_CONNECTTIMEOUT : errno,
2289 sx->verify ? US strerror(errno) : NULL,
2290 DEFER, FALSE, &sx->delivery_start);
2291 sx->send_quit = FALSE;
2295 (void) setsockopt(sx->cctx.sock, IPPROTO_TCP, TCP_QUICKACK, US &off,
2299 /* Expand the greeting message while waiting for the initial response. (Makes
2300 sense if helo_data contains ${lookup dnsdb ...} stuff). The expansion is
2301 delayed till here so that $sending_interface and $sending_port are set. */
2302 /*XXX early-pipe: they still will not be. Is there any way to find out what they
2303 will be? Somehow I doubt it. */
2306 if (!(sx->helo_data = expand_string(sx->helo_data)))
2308 log_write(0, LOG_MAIN|LOG_PANIC,
2309 "<%s>: failed to expand transport's helo_data value for callout: %s",
2310 sx->addrlist->address, expand_string_message);
2315 expand_string_message = NULL;
2316 if ((sx->helo_data = string_domain_utf8_to_alabel(sx->helo_data,
2317 &expand_string_message)),
2318 expand_string_message)
2320 log_write(0, LOG_MAIN|LOG_PANIC,
2321 "<%s>: failed to expand transport's helo_data value for callout: %s",
2322 sx->addrlist->address, expand_string_message);
2324 sx->helo_data = NULL;
2328 /* The first thing is to wait for an initial OK response. The dreaded "goto"
2329 is nevertheless a reasonably clean way of programming this kind of logic,
2330 where you want to escape on any error. */
2334 #ifndef DISABLE_PIPE_CONNECT
2335 if (sx->early_pipe_active)
2337 sx->pending_BANNER = TRUE; /* sync_responses() must eventually handle */
2338 sx->outblock.cmd_count = 1;
2343 if (!smtp_reap_banner(sx))
2344 goto RESPONSE_FAILED;
2347 #ifndef DISABLE_EVENT
2350 lookup_dnssec_authenticated = sx->conn_args.host->dnssec==DS_YES ? US"yes"
2351 : sx->conn_args.host->dnssec==DS_NO ? US"no" : NULL;
2352 s = event_raise(sx->conn_args.tblock->event_action, US"smtp:connect", sx->buffer);
2355 set_errno_nohost(sx->addrlist, ERRNO_EXPANDFAIL,
2356 string_sprintf("deferred by smtp:connect event expansion: %s", s),
2357 DEFER, FALSE, &sx->delivery_start);
2364 /* Now check if the helo_data expansion went well, and sign off cleanly if
2369 message = string_sprintf("failed to expand helo_data: %s",
2370 expand_string_message);
2371 set_errno_nohost(sx->addrlist, ERRNO_EXPANDFAIL, message, DEFER, FALSE, &sx->delivery_start);
2377 /** Debugging without sending a message
2378 sx->addrlist->transport_return = DEFER;
2382 /* Errors that occur after this point follow an SMTP command, which is
2383 left in big_buffer by smtp_write_command() for use in error messages. */
2385 smtp_command = big_buffer;
2387 /* Tell the remote who we are...
2389 February 1998: A convention has evolved that ESMTP-speaking MTAs include the
2390 string "ESMTP" in their greeting lines, so make Exim send EHLO if the
2391 greeting is of this form. The assumption was that the far end supports it
2392 properly... but experience shows that there are some that give 5xx responses,
2393 even though the banner includes "ESMTP" (there's a bloody-minded one that
2394 says "ESMTP not spoken here"). Cope with that case.
2396 September 2000: Time has passed, and it seems reasonable now to always send
2397 EHLO at the start. It is also convenient to make the change while installing
2400 July 2003: Joachim Wieland met a broken server that advertises "PIPELINING"
2401 but times out after sending MAIL FROM, RCPT TO and DATA all together. There
2402 would be no way to send out the mails, so there is now a host list
2403 "hosts_avoid_esmtp" that disables ESMTP for special hosts and solves the
2404 PIPELINING problem as well. Maybe it can also be useful to cure other
2405 problems with broken servers.
2407 Exim originally sent "Helo" at this point and ran for nearly a year that way.
2408 Then somebody tried it with a Microsoft mailer... It seems that all other
2409 mailers use upper case for some reason (the RFC is quite clear about case
2410 independence) so, for peace of mind, I gave in. */
2412 sx->esmtp = verify_check_given_host(CUSS &ob->hosts_avoid_esmtp, sx->conn_args.host) != OK;
2414 /* Alas; be careful, since this goto is not an error-out, so conceivably
2415 we might set data between here and the target which we assume to exist
2416 and be usable. I can see this coming back to bite us. */
2420 smtp_peer_options |= OPTION_TLS;
2421 suppress_tls = FALSE;
2422 ob->tls_tempfail_tryclear = FALSE;
2423 smtp_command = US"SSL-on-connect";
2430 if (smtp_write_command(sx,
2431 #ifndef DISABLE_PIPE_CONNECT
2432 sx->early_pipe_active ? SCMD_BUFFER :
2435 "%s %s\r\n", sx->lmtp ? "LHLO" : "EHLO", sx->helo_data) < 0)
2437 sx->esmtp_sent = TRUE;
2439 #ifndef DISABLE_PIPE_CONNECT
2440 if (sx->early_pipe_active)
2442 sx->pending_EHLO = TRUE;
2444 /* If we have too many authenticators to handle and might need to AUTH
2445 for this transport, pipeline no further as we will need the
2446 list of auth methods offered. Reap the banner and EHLO. */
2448 if ( (ob->hosts_require_auth || ob->hosts_try_auth)
2449 && f.smtp_in_early_pipe_no_auth)
2451 DEBUG(D_transport) debug_printf("may need to auth, so pipeline no further\n");
2452 if (smtp_write_command(sx, SCMD_FLUSH, NULL) < 0)
2454 if (sync_responses(sx, 2, 0) != 0)
2457 debug_printf("failed reaping pipelined cmd responses\n");
2458 goto RESPONSE_FAILED;
2460 sx->early_pipe_active = FALSE;
2465 if (!smtp_reap_ehlo(sx))
2466 goto RESPONSE_FAILED;
2470 debug_printf("not sending EHLO (host matches hosts_avoid_esmtp)\n");
2472 #ifndef DISABLE_PIPE_CONNECT
2473 if (!sx->early_pipe_active)
2478 int n = sizeof(sx->buffer);
2479 uschar * rsp = sx->buffer;
2481 if (sx->esmtp_sent && (n = Ustrlen(sx->buffer) + 1) < sizeof(sx->buffer)/2)
2482 { rsp = sx->buffer + n; n = sizeof(sx->buffer) - n; }
2484 if (smtp_write_command(sx, SCMD_FLUSH, "HELO %s\r\n", sx->helo_data) < 0)
2486 good_response = smtp_read_response(sx, rsp, n, '2', ob->command_timeout);
2487 #ifdef EXPERIMENTAL_DSN_INFO
2488 sx->helo_response = string_copy(rsp);
2492 /* Handle special logging for a closed connection after HELO
2493 when had previously sent EHLO */
2495 if (rsp != sx->buffer && rsp[0] == 0 && (errno == 0 || errno == ECONNRESET))
2497 errno = ERRNO_SMTPCLOSED;
2498 goto EHLOHELO_FAILED;
2500 memmove(sx->buffer, rsp, Ustrlen(rsp));
2501 goto RESPONSE_FAILED;
2505 if (sx->esmtp || sx->lmtp)
2507 #ifndef DISABLE_PIPE_CONNECT
2508 if (!sx->early_pipe_active)
2511 sx->peer_offered = ehlo_response(sx->buffer,
2512 OPTION_TLS /* others checked later */
2513 #ifndef DISABLE_PIPE_CONNECT
2514 | (sx->early_pipe_ok
2516 | OPTION_CHUNKING | OPTION_PRDR | OPTION_DSN | OPTION_PIPE | OPTION_SIZE
2525 #ifdef EXPERIMENTAL_ESMTP_LIMITS
2526 if (tls_out.active.sock >= 0 || !(sx->peer_offered & OPTION_TLS))
2528 ehlo_response_limits_read(sx);
2529 ehlo_response_limits_apply(sx);
2532 #ifndef DISABLE_PIPE_CONNECT
2533 if (sx->early_pipe_ok)
2535 sx->ehlo_resp.cleartext_features = sx->peer_offered;
2537 if ( (sx->peer_offered & (OPTION_PIPE | OPTION_EARLY_PIPE))
2538 == (OPTION_PIPE | OPTION_EARLY_PIPE))
2540 DEBUG(D_transport) debug_printf("PIPE_CONNECT usable in future for this IP\n");
2541 sx->ehlo_resp.cleartext_auths = study_ehlo_auths(sx);
2542 write_ehlo_cache_entry(sx);
2548 /* Set tls_offered if the response to EHLO specifies support for STARTTLS. */
2551 smtp_peer_options |= sx->peer_offered & OPTION_TLS;
2556 /* For continuing deliveries down the same channel, having re-exec'd the socket
2557 is the standard input; for a socket held open from verify it is recorded
2558 in the cutthrough context block. Either way we don't need to redo EHLO here
2559 (but may need to do so for TLS - see below).
2560 Set up the pointer to where subsequent commands will be left, for
2561 error messages. Note that smtp_peer_options will have been
2562 set from the command line if they were set in the process that passed the
2565 /*XXX continue case needs to propagate DSN_INFO, prob. in deliver.c
2566 as the continue goes via transport_pass_socket() and doublefork and exec.
2567 It does not wait. Unclear how we keep separate host's responses
2568 separate - we could match up by host ip+port as a bodge. */
2572 if (cutthrough.cctx.sock >= 0 && cutthrough.callout_hold_only)
2574 sx->cctx = cutthrough.cctx;
2575 sx->conn_args.host->port = sx->port = cutthrough.host.port;
2579 sx->cctx.sock = 0; /* stdin */
2580 sx->cctx.tls_ctx = NULL;
2581 smtp_port_for_connect(sx->conn_args.host, sx->port); /* Record the port that was used */
2583 sx->inblock.cctx = sx->outblock.cctx = &sx->cctx;
2584 smtp_command = big_buffer;
2585 sx->peer_offered = smtp_peer_options;
2586 #ifdef EXPERIMENTAL_ESMTP_LIMITS
2587 /* Limits passed by cmdline over exec. */
2588 ehlo_limits_apply(sx,
2589 sx->peer_limit_mail = continue_limit_mail,
2590 sx->peer_limit_rcpt = continue_limit_rcpt,
2591 sx->peer_limit_rcptdom = continue_limit_rcptdom);
2593 sx->helo_data = NULL; /* ensure we re-expand ob->helo_data */
2595 /* For a continued connection with TLS being proxied for us, or a
2596 held-open verify connection with TLS, nothing more to do. */
2598 if ( continue_proxy_cipher
2599 || (cutthrough.cctx.sock >= 0 && cutthrough.callout_hold_only
2600 && cutthrough.is_tls)
2603 sx->pipelining_used = pipelining_active = !!(smtp_peer_options & OPTION_PIPE);
2604 HDEBUG(D_transport) debug_printf("continued connection, %s TLS\n",
2605 continue_proxy_cipher ? "proxied" : "verify conn with");
2608 HDEBUG(D_transport) debug_printf("continued connection, no TLS\n");
2611 /* If TLS is available on this connection, whether continued or not, attempt to
2612 start up a TLS session, unless the host is in hosts_avoid_tls. If successful,
2613 send another EHLO - the server may give a different answer in secure mode. We
2614 use a separate buffer for reading the response to STARTTLS so that if it is
2615 negative, the original EHLO data is available for subsequent analysis, should
2616 the client not be required to use TLS. If the response is bad, copy the buffer
2617 for error analysis. */
2620 if ( smtp_peer_options & OPTION_TLS
2622 && verify_check_given_host(CUSS &ob->hosts_avoid_tls, sx->conn_args.host) != OK
2624 || verify_check_given_host(CUSS &ob->hosts_verify_avoid_tls, sx->conn_args.host) != OK
2627 uschar buffer2[4096];
2629 if (smtp_write_command(sx, SCMD_FLUSH, "STARTTLS\r\n") < 0)
2632 #ifndef DISABLE_PIPE_CONNECT
2633 /* If doing early-pipelining reap the banner and EHLO-response but leave
2634 the response for the STARTTLS we just sent alone. On fail, assume wrong
2635 cached capability and retry with the pipelining disabled. */
2637 if (sx->early_pipe_active && sync_responses(sx, 2, 0) != 0)
2640 debug_printf("failed reaping pipelined cmd responses\n");
2641 close(sx->cctx.sock);
2643 sx->early_pipe_active = FALSE;
2644 goto PIPE_CONNECT_RETRY;
2648 /* If there is an I/O error, transmission of this message is deferred. If
2649 there is a temporary rejection of STARRTLS and tls_tempfail_tryclear is
2650 false, we also defer. However, if there is a temporary rejection of STARTTLS
2651 and tls_tempfail_tryclear is true, or if there is an outright rejection of
2652 STARTTLS, we carry on. This means we will try to send the message in clear,
2653 unless the host is in hosts_require_tls (tested below). */
2655 if (!smtp_read_response(sx, buffer2, sizeof(buffer2), '2', ob->command_timeout))
2659 || (buffer2[0] == '4' && !ob->tls_tempfail_tryclear)
2662 Ustrncpy(sx->buffer, buffer2, sizeof(sx->buffer));
2663 sx->buffer[sizeof(sx->buffer)-1] = '\0';
2664 goto RESPONSE_FAILED;
2668 /* STARTTLS accepted: try to negotiate a TLS session. */
2673 if (!tls_client_start(&sx->cctx, &sx->conn_args, sx->addrlist, &tls_out, &tls_errstr))
2675 /* TLS negotiation failed; give an error. From outside, this function may
2676 be called again to try in clear on a new connection, if the options permit
2677 it for this host. */
2679 DEBUG(D_tls) debug_printf("TLS session fail: %s\n", tls_errstr);
2681 # ifdef SUPPORT_DANE
2682 if (sx->conn_args.dane)
2684 log_write(0, LOG_MAIN,
2685 "DANE attempt failed; TLS connection to %s [%s]: %s",
2686 sx->conn_args.host->name, sx->conn_args.host->address, tls_errstr);
2687 # ifndef DISABLE_EVENT
2688 (void) event_raise(sx->conn_args.tblock->event_action,
2689 US"dane:fail", US"validation-failure"); /* could do with better detail */
2694 errno = ERRNO_TLSFAILURE;
2695 message = string_sprintf("TLS session: %s", tls_errstr);
2696 sx->send_quit = FALSE;
2699 sx->send_tlsclose = TRUE;
2701 /* TLS session is set up. Check the inblock fill level. If there is
2702 content then as we have not yet done a tls read it must have arrived before
2703 the TLS handshake, in-clear. That violates the sync requirement of the
2704 STARTTLS RFC, so fail. */
2706 if (sx->inblock.ptr != sx->inblock.ptrend)
2710 int i = sx->inblock.ptrend - sx->inblock.ptr;
2711 debug_printf("unused data in input buffer after ack for STARTTLS:\n"
2713 i > 100 ? 100 : i, sx->inblock.ptr, i > 100 ? "..." : "");
2715 tls_errstr = US"synch error before connect";
2716 goto TLS_CONN_FAILED;
2719 smtp_peer_options_wrap = smtp_peer_options;
2720 for (address_item * addr = sx->addrlist; addr; addr = addr->next)
2721 if (addr->transport_return == PENDING_DEFER)
2723 addr->cipher = tls_out.cipher;
2724 addr->ourcert = tls_out.ourcert;
2725 addr->peercert = tls_out.peercert;
2726 addr->peerdn = tls_out.peerdn;
2727 addr->ocsp = tls_out.ocsp;
2728 addr->tlsver = tls_out.ver;
2733 /* if smtps, we'll have smtp_command set to something else; always safe to
2735 smtp_command = big_buffer;
2737 /* If we started TLS, redo the EHLO/LHLO exchange over the secure channel. If
2738 helo_data is null, we are dealing with a connection that was passed from
2739 another process, and so we won't have expanded helo_data above. We have to
2740 expand it here. $sending_ip_address and $sending_port are set up right at the
2741 start of the Exim process (in exim.c). */
2743 if (tls_out.active.sock >= 0)
2745 uschar * greeting_cmd;
2747 if (!sx->helo_data && !(sx->helo_data = expand_string(ob->helo_data)))
2749 uschar *message = string_sprintf("failed to expand helo_data: %s",
2750 expand_string_message);
2751 set_errno_nohost(sx->addrlist, ERRNO_EXPANDFAIL, message, DEFER, FALSE, &sx->delivery_start);
2756 #ifndef DISABLE_PIPE_CONNECT
2757 /* For SMTPS there is no cleartext early-pipe; use the crypted permission bit.
2758 We're unlikely to get the group sent and delivered before the server sends its
2759 banner, but it's still worth sending as a group.
2760 For STARTTLS allow for cleartext early-pipe but no crypted early-pipe, but not
2763 if (sx->smtps ? sx->early_pipe_ok : sx->early_pipe_active)
2765 sx->peer_offered = sx->ehlo_resp.crypted_features;
2766 if ((sx->early_pipe_active =
2767 !!(sx->ehlo_resp.crypted_features & OPTION_EARLY_PIPE)))
2768 DEBUG(D_transport) debug_printf("Using cached crypted PIPE_CONNECT\n");
2771 #ifdef EXPERIMMENTAL_ESMTP_LIMITS
2772 /* As we are about to send another EHLO, forget any LIMITS received so far. */
2773 sx->peer_limit_mail = sx->peer_limit_rcpt = sx->peer_limit_rcptdom = 0;
2774 if ((sx->max_mail = sx->conn_args.tblock->connection_max_message) == 0) sx->max_mail = 999999;
2775 if ((sx->max_rcpt = sx->conn_args.tblock->max_addresses) == 0) sx->max_rcpt = 999999;
2776 sx->single_rcpt_domain = FALSE;
2779 /* For SMTPS we need to wait for the initial OK response. */
2781 #ifndef DISABLE_PIPE_CONNECT
2782 if (sx->early_pipe_active)
2784 sx->pending_BANNER = TRUE;
2785 sx->outblock.cmd_count = 1;
2789 if (!smtp_reap_banner(sx))
2790 goto RESPONSE_FAILED;
2793 greeting_cmd = US"LHLO";
2795 greeting_cmd = US"EHLO";
2798 greeting_cmd = US"HELO";
2800 debug_printf("not sending EHLO (host matches hosts_avoid_esmtp)\n");
2803 if (smtp_write_command(sx,
2804 #ifndef DISABLE_PIPE_CONNECT
2805 sx->early_pipe_active ? SCMD_BUFFER :
2808 "%s %s\r\n", greeting_cmd, sx->helo_data) < 0)
2811 #ifndef DISABLE_PIPE_CONNECT
2812 if (sx->early_pipe_active)
2813 sx->pending_EHLO = TRUE;
2817 if (!smtp_reap_ehlo(sx))
2820 /* The GnuTLS layer in Exim only spots a server-rejection of a client
2821 cert late, under TLS1.3 - which means here; the first time we try to
2822 receive crypted data. Treat it as if it was a connect-time failure.
2823 See also the early-pipe equivalent... which will be hard; every call
2824 to sync_responses will need to check the result.
2825 It would be nicer to have GnuTLS check the cert during the handshake.
2826 Can it do that, with all the flexibility we need? */
2828 tls_errstr = US"error on first read";
2829 goto TLS_CONN_FAILED;
2832 goto RESPONSE_FAILED;
2834 smtp_peer_options = 0;
2838 /* If the host is required to use a secure channel, ensure that we
2842 # ifdef SUPPORT_DANE
2843 || sx->conn_args.dane
2845 || verify_check_given_host(CUSS &ob->hosts_require_tls, sx->conn_args.host) == OK
2848 errno = ERRNO_TLSREQUIRED;
2849 message = string_sprintf("a TLS session is required, but %s",
2850 smtp_peer_options & OPTION_TLS
2851 ? "an attempt to start TLS failed" : "the server did not offer TLS support");
2852 # if defined(SUPPORT_DANE) && !defined(DISABLE_EVENT)
2853 if (sx->conn_args.dane)
2854 (void) event_raise(sx->conn_args.tblock->event_action, US"dane:fail",
2855 smtp_peer_options & OPTION_TLS
2856 ? US"validation-failure" /* could do with better detail */
2857 : US"starttls-not-supported");
2861 #endif /*DISABLE_TLS*/
2863 /* If TLS is active, we have just started it up and re-done the EHLO command,
2864 so its response needs to be analyzed. If TLS is not active and this is a
2865 continued session down a previously-used socket, we haven't just done EHLO, so
2868 if ( !continue_hostname
2870 || tls_out.active.sock >= 0
2874 if (sx->esmtp || sx->lmtp)
2876 #ifndef DISABLE_PIPE_CONNECT
2877 if (!sx->early_pipe_active)
2880 sx->peer_offered = ehlo_response(sx->buffer,
2882 #ifndef DISABLE_PIPE_CONNECT
2883 | (sx->lmtp && ob->lmtp_ignore_quota ? OPTION_IGNQ : 0)
2884 | OPTION_DSN | OPTION_PIPE | OPTION_SIZE
2885 | OPTION_CHUNKING | OPTION_PRDR | OPTION_UTF8
2886 | (tls_out.active.sock >= 0 ? OPTION_EARLY_PIPE : 0) /* not for lmtp */
2890 | (sx->lmtp && ob->lmtp_ignore_quota ? OPTION_IGNQ : 0)
2893 # ifdef SUPPORT_I18N
2894 | (sx->addrlist->prop.utf8_msg ? OPTION_UTF8 : 0)
2895 /*XXX if we hand peercaps on to continued-conn processes,
2896 must not depend on this addr */
2900 | (ob->size_addition >= 0 ? OPTION_SIZE : 0)
2903 #ifndef DISABLE_PIPE_CONNECT
2904 if (tls_out.active.sock >= 0)
2905 sx->ehlo_resp.crypted_features = sx->peer_offered;
2908 #ifdef EXPERIMENTAL_ESMTP_LIMITS
2909 if (tls_out.active.sock >= 0 || !(sx->peer_offered & OPTION_TLS))
2911 ehlo_response_limits_read(sx);
2912 ehlo_response_limits_apply(sx);
2917 /* Set for IGNOREQUOTA if the response to LHLO specifies support and the
2918 lmtp_ignore_quota option was set. */
2920 sx->igquotstr = sx->peer_offered & OPTION_IGNQ ? US" IGNOREQUOTA" : US"";
2922 /* If the response to EHLO specified support for the SIZE parameter, note
2923 this, provided size_addition is non-negative. */
2925 smtp_peer_options |= sx->peer_offered & OPTION_SIZE;
2927 /* Note whether the server supports PIPELINING. If hosts_avoid_esmtp matched
2928 the current host, esmtp will be false, so PIPELINING can never be used. If
2929 the current host matches hosts_avoid_pipelining, don't do it. */
2931 if ( sx->peer_offered & OPTION_PIPE
2932 && verify_check_given_host(CUSS &ob->hosts_avoid_pipelining, sx->conn_args.host) != OK)
2933 smtp_peer_options |= OPTION_PIPE;
2935 DEBUG(D_transport) debug_printf("%susing PIPELINING\n",
2936 smtp_peer_options & OPTION_PIPE ? "" : "not ");
2938 if ( sx->peer_offered & OPTION_CHUNKING
2939 && verify_check_given_host(CUSS &ob->hosts_try_chunking, sx->conn_args.host) != OK)
2940 sx->peer_offered &= ~OPTION_CHUNKING;
2942 if (sx->peer_offered & OPTION_CHUNKING)
2943 DEBUG(D_transport) debug_printf("CHUNKING usable\n");
2945 #ifndef DISABLE_PRDR
2946 if ( sx->peer_offered & OPTION_PRDR
2947 && verify_check_given_host(CUSS &ob->hosts_try_prdr, sx->conn_args.host) != OK)
2948 sx->peer_offered &= ~OPTION_PRDR;
2950 if (sx->peer_offered & OPTION_PRDR)
2951 DEBUG(D_transport) debug_printf("PRDR usable\n");
2954 /* Note if the server supports DSN */
2955 smtp_peer_options |= sx->peer_offered & OPTION_DSN;
2956 DEBUG(D_transport) debug_printf("%susing DSN\n",
2957 sx->peer_offered & OPTION_DSN ? "" : "not ");
2959 #ifndef DISABLE_PIPE_CONNECT
2960 if ( sx->early_pipe_ok
2961 && !sx->early_pipe_active
2962 && tls_out.active.sock >= 0
2963 && smtp_peer_options & OPTION_PIPE
2964 && ( sx->ehlo_resp.cleartext_features | sx->ehlo_resp.crypted_features)
2965 & OPTION_EARLY_PIPE)
2967 DEBUG(D_transport) debug_printf("PIPE_CONNECT usable in future for this IP\n");
2968 sx->ehlo_resp.crypted_auths = study_ehlo_auths(sx);
2969 write_ehlo_cache_entry(sx);
2973 /* Note if the response to EHLO specifies support for the AUTH extension.
2974 If it has, check that this host is one we want to authenticate to, and do
2975 the business. The host name and address must be available when the
2976 authenticator's client driver is running. */
2978 switch (yield = smtp_auth(sx))
2980 default: goto SEND_QUIT;
2982 case FAIL_SEND: goto SEND_FAILED;
2983 case FAIL: goto RESPONSE_FAILED;
2987 sx->pipelining_used = pipelining_active = !!(smtp_peer_options & OPTION_PIPE);
2989 /* The setting up of the SMTP call is now complete. Any subsequent errors are
2990 message-specific. */
2992 sx->setting_up = FALSE;
2995 if (sx->addrlist->prop.utf8_msg)
2999 /* If the transport sets a downconversion mode it overrides any set by ACL
3002 if ((s = ob->utf8_downconvert))
3004 if (!(s = expand_string(s)))
3006 message = string_sprintf("failed to expand utf8_downconvert: %s",
3007 expand_string_message);
3008 set_errno_nohost(sx->addrlist, ERRNO_EXPANDFAIL, message, DEFER, FALSE, &sx->delivery_start);
3014 case '1': sx->addrlist->prop.utf8_downcvt = TRUE;
3015 sx->addrlist->prop.utf8_downcvt_maybe = FALSE;
3017 case '0': sx->addrlist->prop.utf8_downcvt = FALSE;
3018 sx->addrlist->prop.utf8_downcvt_maybe = FALSE;
3020 case '-': if (s[1] == '1')
3022 sx->addrlist->prop.utf8_downcvt = FALSE;
3023 sx->addrlist->prop.utf8_downcvt_maybe = TRUE;
3029 sx->utf8_needed = !sx->addrlist->prop.utf8_downcvt
3030 && !sx->addrlist->prop.utf8_downcvt_maybe;
3031 DEBUG(D_transport) if (!sx->utf8_needed)
3032 debug_printf("utf8: %s downconvert\n",
3033 sx->addrlist->prop.utf8_downcvt ? "mandatory" : "optional");
3036 /* If this is an international message we need the host to speak SMTPUTF8 */
3037 if (sx->utf8_needed && !(sx->peer_offered & OPTION_UTF8))
3039 errno = ERRNO_UTF8_FWD;
3040 goto RESPONSE_FAILED;
3042 #endif /*SUPPORT_I18N*/
3051 if (errno == ECONNREFUSED) /* first-read error on a TFO conn */
3053 /* There is a testing facility for simulating a connection timeout, as I
3054 can't think of any other way of doing this. It converts a connection
3055 refused into a timeout if the timeout is set to 999999. This is done for
3056 a 3whs connection in ip_connect(), but a TFO connection does not error
3057 there - instead it gets ECONNREFUSED on the first data read. Tracking
3058 that a TFO really was done is too hard, or we would set a
3059 sx->pending_conn_done bit and test that in smtp_reap_banner() and
3060 smtp_reap_ehlo(). That would let us also add the conn-timeout to the
3063 if (f.running_in_test_harness && ob->connect_timeout == 999999)
3065 set_errno_nohost(sx->addrlist,
3066 errno == ETIMEDOUT ? ERRNO_CONNECTTIMEOUT : errno,
3067 sx->verify ? US strerror(errno) : NULL,
3068 DEFER, FALSE, &sx->delivery_start);
3069 sx->send_quit = FALSE;
3073 /* really an error on an SMTP read */
3075 sx->send_quit = check_response(sx->conn_args.host, &errno, sx->addrlist->more_errno,
3076 sx->buffer, &code, &message, &pass_message);
3082 message = US string_sprintf("send() to %s [%s] failed: %s",
3083 sx->conn_args.host->name, sx->conn_args.host->address, strerror(errno));
3084 sx->send_quit = FALSE;
3090 message = string_sprintf("Remote host closed connection in response to %s"
3091 " (EHLO response was: %s)", smtp_command, sx->buffer);
3092 sx->send_quit = FALSE;
3096 /* This label is jumped to directly when a TLS negotiation has failed,
3097 or was not done for a host for which it is required. Values will be set
3098 in message and errno, and setting_up will always be true. Treat as
3099 a temporary error. */
3103 code = '4', yield = DEFER;
3107 /* The failure happened while setting up the call; see if the failure was
3108 a 5xx response (this will either be on connection, or following HELO - a 5xx
3109 after EHLO causes it to try HELO). If so, and there are no more hosts to try,
3110 fail all addresses, as this host is never going to accept them. For other
3111 errors during setting up (timeouts or whatever), defer all addresses, and
3112 yield DEFER, so that the host is not tried again for a while.
3114 XXX This peeking for another host feels like a layering violation. We want
3115 to note the host as unusable, but down here we shouldn't know if this was
3116 the last host to try for the addr(list). Perhaps the upper layer should be
3117 the one to do set_errno() ? The problem is that currently the addr is where
3118 errno etc. are stashed, but until we run out of hosts to try the errors are
3119 host-specific. Maybe we should enhance the host_item definition? */
3122 sx->ok = FALSE; /* For when reached by GOTO */
3123 set_errno(sx->addrlist, errno, message,
3124 sx->conn_args.host->next
3128 || errno == ERRNO_UTF8_FWD
3132 errno == ECONNREFUSED ? NULL : sx->conn_args.host,
3133 #ifdef EXPERIMENTAL_DSN_INFO
3134 sx->smtp_greeting, sx->helo_response,
3136 &sx->delivery_start);
3143 (void)smtp_write_command(sx, SCMD_FLUSH, "QUIT\r\n");
3146 if (sx->cctx.tls_ctx)
3148 if (sx->send_tlsclose)
3150 tls_close(sx->cctx.tls_ctx, TLS_SHUTDOWN_NOWAIT);
3151 sx->send_tlsclose = FALSE;
3153 sx->cctx.tls_ctx = NULL;
3157 /* Close the socket, and return the appropriate value, first setting
3158 works because the NULL setting is passed back to the calling process, and
3159 remote_max_parallel is forced to 1 when delivering over an existing connection,
3162 HDEBUG(D_transport|D_acl|D_v) debug_printf_indent(" SMTP(close)>>\n");
3165 shutdown(sx->cctx.sock, SHUT_WR);
3166 if (fcntl(sx->cctx.sock, F_SETFL, O_NONBLOCK) == 0)
3167 for (int i = 16; read(sx->cctx.sock, sx->inbuffer, sizeof(sx->inbuffer)) > 0 && i > 0;)
3168 i--; /* drain socket */
3169 sx->send_quit = FALSE;
3171 (void)close(sx->cctx.sock);
3174 #ifndef DISABLE_EVENT
3175 (void) event_raise(sx->conn_args.tblock->event_action, US"tcp:close", NULL);
3178 continue_transport = NULL;
3179 continue_hostname = NULL;
3186 /* Create the string of options that will be appended to the MAIL FROM:
3187 in the connection context buffer */
3190 build_mailcmd_options(smtp_context * sx, address_item * addrlist)
3192 uschar * p = sx->buffer;
3193 address_item * addr;
3198 /* If we know the receiving MTA supports the SIZE qualification, and we know it,
3199 send it, adding something to the message size to allow for imprecision
3200 and things that get added en route. Exim keeps the number of lines
3201 in a message, so we can give an accurate value for the original message, but we
3202 need some additional to handle added headers. (Double "." characters don't get
3203 included in the count.) */
3205 if ( message_size > 0
3206 && sx->peer_offered & OPTION_SIZE && !(sx->avoid_option & OPTION_SIZE))
3208 /*XXX problem here under spool_files_wireformat?
3209 Or just forget about lines? Or inflate by a fixed proportion? */
3211 sprintf(CS p, " SIZE=%d", message_size+message_linecount+(SOB sx->conn_args.ob)->size_addition);
3215 #ifndef DISABLE_PRDR
3216 /* If it supports Per-Recipient Data Responses, and we have more than one recipient,
3219 sx->prdr_active = FALSE;
3220 if (sx->peer_offered & OPTION_PRDR)
3221 for (address_item * addr = addrlist; addr; addr = addr->next)
3222 if (addr->transport_return == PENDING_DEFER)
3224 for (addr = addr->next; addr; addr = addr->next)
3225 if (addr->transport_return == PENDING_DEFER)
3226 { /* at least two recipients to send */
3227 sx->prdr_active = TRUE;
3228 sprintf(CS p, " PRDR"); p += 5;
3236 /* If it supports internationalised messages, and this meesage need that,
3239 if ( sx->peer_offered & OPTION_UTF8
3240 && addrlist->prop.utf8_msg
3241 && !addrlist->prop.utf8_downcvt
3243 Ustrcpy(p, US" SMTPUTF8"), p += 9;
3246 /* check if all addresses have DSN-lasthop flag; do not send RET and ENVID if so */
3247 for (sx->dsn_all_lasthop = TRUE, addr = addrlist, address_count = 0;
3248 addr && address_count < sx->max_rcpt; /*XXX maybe also || sx->single_rcpt_domain ? */
3249 addr = addr->next) if (addr->transport_return == PENDING_DEFER)
3252 if (!(addr->dsn_flags & rf_dsnlasthop))
3254 sx->dsn_all_lasthop = FALSE;
3259 /* Add any DSN flags to the mail command */
3261 if (sx->peer_offered & OPTION_DSN && !sx->dsn_all_lasthop)
3263 if (dsn_ret == dsn_ret_hdrs)
3264 { Ustrcpy(p, US" RET=HDRS"); p += 9; }
3265 else if (dsn_ret == dsn_ret_full)
3266 { Ustrcpy(p, US" RET=FULL"); p += 9; }
3270 string_format(p, sizeof(sx->buffer) - (p-sx->buffer), " ENVID=%s", dsn_envid);
3275 /* If an authenticated_sender override has been specified for this transport
3276 instance, expand it. If the expansion is forced to fail, and there was already
3277 an authenticated_sender for this message, the original value will be used.
3278 Other expansion failures are serious. An empty result is ignored, but there is
3279 otherwise no check - this feature is expected to be used with LMTP and other
3280 cases where non-standard addresses (e.g. without domains) might be required. */
3282 return smtp_mail_auth_str(sx, p, addrlist) ? ERROR : OK;
3287 build_rcptcmd_options(smtp_context * sx, const address_item * addr)
3289 uschar * p = sx->buffer;
3292 /* Add any DSN flags to the rcpt command */
3294 if (sx->peer_offered & OPTION_DSN && !(addr->dsn_flags & rf_dsnlasthop))
3296 if (addr->dsn_flags & rf_dsnflags)
3300 Ustrcpy(p, US" NOTIFY=");
3302 for (int i = 0; i < nelem(rf_list); i++) if (addr->dsn_flags & rf_list[i])
3304 if (!first) *p++ = ',';
3306 Ustrcpy(p, rf_names[i]);
3311 if (addr->dsn_orcpt)
3313 string_format(p, sizeof(sx->buffer) - (p-sx->buffer), " ORCPT=%s",
3324 0 good, rcpt results in addr->transport_return (PENDING_OK, DEFER, FAIL)
3325 -1 MAIL response error
3326 -2 any non-MAIL read i/o error
3327 -3 non-MAIL response timeout
3328 -4 internal error; channel still usable
3333 smtp_write_mail_and_rcpt_cmds(smtp_context * sx, int * yield)
3335 address_item * addr;
3336 #ifdef EXPERIMENTAL_ESMTP_LIMITS
3337 address_item * restart_addr = NULL;
3339 int address_count, pipe_limit;
3342 if (build_mailcmd_options(sx, sx->first_addr) != OK)
3348 /* From here until we send the DATA command, we can make use of PIPELINING
3349 if the server host supports it. The code has to be able to check the responses
3350 at any point, for when the buffer fills up, so we write it totally generally.
3351 When PIPELINING is off, each command written reports that it has flushed the
3354 sx->pending_MAIL = TRUE; /* The block starts with MAIL */
3357 uschar * s = sx->from_addr;
3359 uschar * errstr = NULL;
3361 /* If we must downconvert, do the from-address here. Remember we had to
3362 for the to-addresses (done below), and also (ugly) for re-doing when building
3363 the delivery log line. */
3365 if ( sx->addrlist->prop.utf8_msg
3366 && (sx->addrlist->prop.utf8_downcvt || !(sx->peer_offered & OPTION_UTF8))
3369 if (s = string_address_utf8_to_alabel(s, &errstr), errstr)
3371 set_errno_nohost(sx->addrlist, ERRNO_EXPANDFAIL, errstr, DEFER, FALSE, &sx->delivery_start);
3375 setflag(sx->addrlist, af_utf8_downcvt);
3379 rc = smtp_write_command(sx, pipelining_active ? SCMD_BUFFER : SCMD_FLUSH,
3380 "MAIL FROM:<%s>%s\r\n", s, sx->buffer);
3383 mail_command = string_copy(big_buffer); /* Save for later error message */
3387 case -1: /* Transmission error */
3390 case +1: /* Cmd was sent */
3391 if (!smtp_read_response(sx, sx->buffer, sizeof(sx->buffer), '2',
3392 (SOB sx->conn_args.ob)->command_timeout))
3394 if (errno == 0 && sx->buffer[0] == '4')
3396 errno = ERRNO_MAIL4XX;
3397 sx->addrlist->more_errno |= ((sx->buffer[1] - '0')*10 + sx->buffer[2] - '0') << 8;
3401 sx->pending_MAIL = FALSE;
3404 /* otherwise zero: command queued for pipeline */
3407 /* Pass over all the relevant recipient addresses for this host, which are the
3408 ones that have status PENDING_DEFER. If we are using PIPELINING, we can send
3409 several before we have to read the responses for those seen so far. This
3410 checking is done by a subroutine because it also needs to be done at the end.
3411 Send only up to max_rcpt addresses at a time, leaving next_addr pointing to
3412 the next one if not all are sent.
3414 In the MUA wrapper situation, we want to flush the PIPELINING buffer for the
3415 last address because we want to abort if any recipients have any kind of
3416 problem, temporary or permanent. We know that all recipient addresses will have
3417 the PENDING_DEFER status, because only one attempt is ever made, and we know
3418 that max_rcpt will be large, so all addresses will be done at once.
3420 For verify we flush the pipeline after any (the only) rcpt address. */
3422 for (addr = sx->first_addr, address_count = 0, pipe_limit = 100;
3423 addr && address_count < sx->max_rcpt;
3424 addr = addr->next) if (addr->transport_return == PENDING_DEFER)
3430 #ifdef EXPERIMENTAL_ESMTP_LIMITS
3431 if ( sx->single_rcpt_domain /* restriction on domains */
3432 && address_count > 0 /* not first being sent */
3433 && Ustrcmp(addr->domain, sx->first_addr->domain) != 0 /* dom diff from first */
3436 DEBUG(D_transport) debug_printf("skipping different domain %s\n", addr->domain);
3438 /* Ensure the smtp-response reaper does not think the address had a RCPT
3439 command sent for it. Reset to PENDING_DEFER in smtp_deliver(), where we
3440 goto SEND_MESSAGE. */
3442 addr->transport_return = SKIP;
3443 if (!restart_addr) restart_addr = addr; /* note restart point */
3444 continue; /* skip this one */
3448 addr->dsn_aware = sx->peer_offered & OPTION_DSN
3449 ? dsn_support_yes : dsn_support_no;
3452 if (pipe_limit-- <= 0)
3453 { no_flush = FALSE; pipe_limit = 100; }
3455 no_flush = pipelining_active && !sx->verify
3456 && (!mua_wrapper || addr->next && address_count < sx->max_rcpt);
3458 build_rcptcmd_options(sx, addr);
3460 /* Now send the RCPT command, and process outstanding responses when
3461 necessary. After a timeout on RCPT, we just end the function, leaving the
3462 yield as OK, because this error can often mean that there is a problem with
3463 just one address, so we don't want to delay the host. */
3465 rcpt_addr = transport_rcpt_address(addr, sx->conn_args.tblock->rcpt_include_affixes);
3468 if ( testflag(sx->addrlist, af_utf8_downcvt)
3469 && !(rcpt_addr = string_address_utf8_to_alabel(rcpt_addr, NULL))
3472 /*XXX could we use a per-address errstr here? Not fail the whole send? */
3473 errno = ERRNO_EXPANDFAIL;
3474 return -5; /*XXX too harsh? */
3478 cmds_sent = smtp_write_command(sx, no_flush ? SCMD_BUFFER : SCMD_FLUSH,
3479 "RCPT TO:<%s>%s%s\r\n", rcpt_addr, sx->igquotstr, sx->buffer);
3481 if (cmds_sent < 0) return -5;
3484 switch(sync_responses(sx, cmds_sent, 0))
3486 case 3: sx->ok = TRUE; /* 2xx & 5xx => OK & progress made */
3487 case 2: sx->completed_addr = TRUE; /* 5xx (only) => progress made */
3490 case 1: sx->ok = TRUE; /* 2xx (only) => OK, but if LMTP, */
3491 if (!sx->lmtp) /* can't tell about progress yet */
3492 sx->completed_addr = TRUE;
3493 case 0: /* No 2xx or 5xx, but no probs */
3494 /* If any RCPT got a 452 response then next_addr has been updated
3495 for restarting with a new MAIL on the same connection. Send no more
3496 RCPTs for this MAIL. */
3500 DEBUG(D_transport) debug_printf("seen 452 too-many-rcpts\n");
3501 sx->RCPT_452 = FALSE;
3502 /* sx->next_addr has been reset for fast_retry */
3507 case -1: return -3; /* Timeout on RCPT */
3508 case -2: return -2; /* non-MAIL read i/o error */
3509 default: return -1; /* any MAIL error */
3511 #ifndef DISABLE_PIPE_CONNECT
3512 case -4: return -1; /* non-2xx for pipelined banner or EHLO */
3513 case -5: return -1; /* TLS first-read error */
3517 } /* Loop for next address */
3519 #ifdef EXPERIMENTAL_ESMTP_LIMITS
3520 sx->next_addr = restart_addr ? restart_addr : addr;
3522 sx->next_addr = addr;
3529 /*****************************************************
3530 * Proxy TLS connection for another transport process *
3531 ******************************************************/
3533 Close the unused end of the pipe, fork once more, then use the given buffer
3534 as a staging area, and select on both the given fd and the TLS'd client-fd for
3535 data to read (per the coding in ip_recv() and fd_ready() this is legitimate).
3536 Do blocking full-size writes, and reads under a timeout. Once both input
3537 channels are closed, exit the process.
3541 buf space to use for buffering
3542 bufsiz size of buffer
3543 pfd pipe filedescriptor array; [0] is comms to proxied process
3544 timeout per-read timeout, seconds
3550 smtp_proxy_tls(void * ct_ctx, uschar * buf, size_t bsize, int * pfd,
3554 int max_fd = MAX(pfd[0], tls_out.active.sock) + 1;
3556 BOOL send_tls_shutdown = TRUE;
3559 if ((rc = exim_fork(US"tls-proxy")))
3560 _exit(rc < 0 ? EXIT_FAILURE : EXIT_SUCCESS);
3562 set_process_info("proxying TLS connection for continued transport");
3564 FD_SET(tls_out.active.sock, &rfds);
3565 FD_SET(pfd[0], &rfds);
3567 for (int fd_bits = 3; fd_bits; )
3569 time_t time_left = timeout;
3570 time_t time_start = time(NULL);
3576 struct timeval tv = { time_left, 0 };
3579 (SELECT_ARG2_TYPE *)&rfds, NULL, (SELECT_ARG2_TYPE *)&efds, &tv);
3581 if (rc < 0 && errno == EINTR)
3582 if ((time_left -= time(NULL) - time_start) > 0) continue;
3586 DEBUG(D_transport) if (rc == 0) debug_printf("%s: timed out\n", __FUNCTION__);
3590 /* For errors where not readable, bomb out */
3592 if (FD_ISSET(tls_out.active.sock, &efds) || FD_ISSET(pfd[0], &efds))
3594 DEBUG(D_transport) debug_printf("select: exceptional cond on %s fd\n",
3595 FD_ISSET(pfd[0], &efds) ? "proxy" : "tls");
3596 if (!(FD_ISSET(tls_out.active.sock, &rfds) || FD_ISSET(pfd[0], &rfds)))
3598 DEBUG(D_transport) debug_printf("- but also readable; no exit yet\n");
3601 while (rc < 0 || !(FD_ISSET(tls_out.active.sock, &rfds) || FD_ISSET(pfd[0], &rfds)));
3603 /* handle inbound data */
3604 if (FD_ISSET(tls_out.active.sock, &rfds))
3605 if ((rc = tls_read(ct_ctx, buf, bsize)) <= 0) /* Expect -1 for EOF; */
3606 { /* that reaps the TLS Close Notify record */
3608 FD_CLR(tls_out.active.sock, &rfds);
3609 shutdown(pfd[0], SHUT_WR);
3613 for (int nbytes = 0; rc - nbytes > 0; nbytes += i)
3614 if ((i = write(pfd[0], buf + nbytes, rc - nbytes)) < 0) goto done;
3616 /* Handle outbound data. We cannot combine payload and the TLS-close
3617 due to the limitations of the (pipe) channel feeding us. Maybe use a unix-domain
3619 if (FD_ISSET(pfd[0], &rfds))
3620 if ((rc = read(pfd[0], buf, bsize)) <= 0)
3623 FD_CLR(pfd[0], &rfds);
3625 # ifdef EXIM_TCP_CORK /* Use _CORK to get TLS Close Notify in FIN segment */
3626 (void) setsockopt(tls_out.active.sock, IPPROTO_TCP, EXIM_TCP_CORK, US &on, sizeof(on));
3628 tls_shutdown_wr(ct_ctx);
3629 send_tls_shutdown = FALSE;
3630 shutdown(tls_out.active.sock, SHUT_WR);
3633 for (int nbytes = 0; rc - nbytes > 0; nbytes += i)
3634 if ((i = tls_write(ct_ctx, buf + nbytes, rc - nbytes, FALSE)) < 0)
3637 if (fd_bits & 1) FD_SET(tls_out.active.sock, &rfds);
3638 if (fd_bits & 2) FD_SET(pfd[0], &rfds);
3642 if (send_tls_shutdown) tls_close(ct_ctx, TLS_SHUTDOWN_NOWAIT);
3644 testharness_pause_ms(100); /* let logging complete */
3645 exim_exit(EXIT_SUCCESS);
3650 /*************************************************
3651 * Deliver address list to given host *
3652 *************************************************/
3654 /* If continue_hostname is not null, we get here only when continuing to
3655 deliver down an existing channel. The channel was passed as the standard
3656 input. TLS is never active on a passed channel; the previous process either
3657 closes it down before passing the connection on, or inserts a TLS-proxy
3658 process and passes on a cleartext conection.
3660 Otherwise, we have to make a connection to the remote host, and do the
3661 initial protocol exchange.
3663 When running as an MUA wrapper, if the sender or any recipient is rejected,
3664 temporarily or permanently, we force failure for all recipients.
3667 addrlist chain of potential addresses to deliver; only those whose
3668 transport_return field is set to PENDING_DEFER are currently
3669 being processed; others should be skipped - they have either
3670 been delivered to an earlier host or IP address, or been
3671 failed by one of them.
3672 host host to deliver to
3673 host_af AF_INET or AF_INET6
3674 defport default TCP/IP port to use if host does not specify, in host
3676 interface interface to bind to, or NULL
3677 tblock transport instance block
3678 message_defer set TRUE if yield is OK, but all addresses were deferred
3679 because of a non-recipient, non-host failure, that is, a
3680 4xx response to MAIL FROM, DATA, or ".". This is a defer
3681 that is specific to the message.
3682 suppress_tls if TRUE, don't attempt a TLS connection - this is set for
3683 a second attempt after TLS initialization fails
3685 Returns: OK - the connection was made and the delivery attempted;
3686 the result for each address is in its data block.
3687 DEFER - the connection could not be made, or something failed
3688 while setting up the SMTP session, or there was a
3689 non-message-specific error, such as a timeout.
3690 ERROR - a filter command is specified for this transport,
3691 and there was a problem setting it up; OR helo_data
3692 or add_headers or authenticated_sender is specified
3693 for this transport, and the string failed to expand
3695 For all non-OK returns the first addr of the list carries the
3696 time taken for the attempt.
3700 smtp_deliver(address_item *addrlist, host_item *host, int host_af, int defport,
3701 uschar *interface, transport_instance *tblock,
3702 BOOL *message_defer, BOOL suppress_tls)
3704 smtp_transport_options_block * ob = SOB tblock->options_block;
3709 uschar *message = NULL;
3710 uschar new_message_id[MESSAGE_ID_LENGTH + 1];
3711 smtp_context * sx = store_get(sizeof(*sx), TRUE); /* tainted, for the data buffers */
3712 BOOL pass_message = FALSE;
3713 #ifdef EXPERIMENTAL_ESMTP_LIMITS
3714 BOOL mail_limit = FALSE;
3719 BOOL tcw_done = FALSE, tcw = FALSE;
3721 *message_defer = FALSE;
3723 memset(sx, 0, sizeof(*sx));
3724 sx->addrlist = addrlist;
3725 sx->conn_args.host = host;
3726 sx->conn_args.host_af = host_af,
3728 sx->conn_args.interface = interface;
3729 sx->helo_data = NULL;
3730 sx->conn_args.tblock = tblock;
3731 /* sx->verify = FALSE; */
3732 gettimeofday(&sx->delivery_start, NULL);
3733 sx->sync_addr = sx->first_addr = addrlist;
3740 /* Get the channel set up ready for a message, MAIL FROM being the next
3741 SMTP command to send. */
3743 if ((rc = smtp_setup_conn(sx, suppress_tls)) != OK)
3745 timesince(&addrlist->delivery_time, &sx->delivery_start);
3751 /* If the connection used DANE, ignore for now any addresses with incompatible
3752 domains. The SNI has to be the domain. Arrange a whole new TCP conn later,
3753 just in case only TLS isn't enough. */
3755 if (sx->conn_args.dane)
3757 const uschar * dane_domain = sx->first_addr->domain;
3759 for (address_item * a = sx->first_addr->next; a; a = a->next)
3760 if ( a->transport_return == PENDING_DEFER
3761 && Ustrcmp(dane_domain, a->domain) != 0)
3763 DEBUG(D_transport) debug_printf("DANE: holding %s for later\n", a->domain);
3765 a->transport_return = DANE;
3770 /* If there is a filter command specified for this transport, we can now
3771 set it up. This cannot be done until the identity of the host is known. */
3773 if (tblock->filter_command)
3775 transport_filter_timeout = tblock->filter_timeout;
3777 /* On failure, copy the error to all addresses, abandon the SMTP call, and
3780 if (!transport_set_up_command(&transport_filter_argv,
3781 tblock->filter_command, TRUE, DEFER, addrlist,
3782 string_sprintf("%.50s transport", tblock->name), NULL))
3784 set_errno_nohost(addrlist->next, addrlist->basic_errno, addrlist->message, DEFER,
3785 FALSE, &sx->delivery_start);
3790 if ( transport_filter_argv
3791 && *transport_filter_argv
3792 && **transport_filter_argv
3793 && sx->peer_offered & OPTION_CHUNKING
3794 #ifndef DISABLE_DKIM
3795 /* When dkim signing, chunking is handled even with a transport-filter */
3796 && !(ob->dkim.dkim_private_key && ob->dkim.dkim_domain && ob->dkim.dkim_selector)
3797 && !ob->dkim.force_bodyhash
3801 sx->peer_offered &= ~OPTION_CHUNKING;
3802 DEBUG(D_transport) debug_printf("CHUNKING not usable due to transport filter\n");
3806 /* For messages that have more than the maximum number of envelope recipients,
3807 we want to send several transactions down the same SMTP connection. (See
3808 comments in deliver.c as to how this reconciles, heuristically, with
3809 remote_max_parallel.) This optimization was added to Exim after the following
3810 code was already working. The simplest way to put it in without disturbing the
3811 code was to use a goto to jump back to this point when there is another
3812 transaction to handle. */
3815 sx->from_addr = return_path;
3816 sx->sync_addr = sx->first_addr;
3818 sx->send_rset = TRUE;
3819 sx->completed_addr = FALSE;
3822 /* If we are a continued-connection-after-verify the MAIL and RCPT
3823 commands were already sent; do not re-send but do mark the addrs as
3824 having been accepted up to RCPT stage. A traditional cont-conn
3825 always has a sequence number greater than one. */
3827 if (continue_hostname && continue_sequence == 1)
3829 /* sx->pending_MAIL = FALSE; */
3831 /* sx->next_addr = NULL; */
3833 for (address_item * addr = addrlist; addr; addr = addr->next)
3834 addr->transport_return = PENDING_OK;
3838 /* Initiate a message transfer. */
3840 switch(smtp_write_mail_and_rcpt_cmds(sx, &yield))
3843 case -1: case -2: goto RESPONSE_FAILED;
3844 case -3: goto END_OFF;
3845 case -4: goto SEND_QUIT;
3846 default: goto SEND_FAILED;
3849 /* If we are an MUA wrapper, abort if any RCPTs were rejected, either
3850 permanently or temporarily. We should have flushed and synced after the last
3858 for (a = sx->first_addr, cnt = 0; a && cnt < sx->max_rcpt; a = a->next, cnt++)
3859 if (a->transport_return != PENDING_OK)
3861 /*XXX could we find a better errno than 0 here? */
3862 set_errno_nohost(addrlist, 0, a->message, FAIL,
3863 testflag(a, af_pass_message), &sx->delivery_start);
3870 /* If ok is TRUE, we know we have got at least one good recipient, and must now
3871 send DATA, but if it is FALSE (in the normal, non-wrapper case), we may still
3872 have a good recipient buffered up if we are pipelining. We don't want to waste
3873 time sending DATA needlessly, so we only send it if either ok is TRUE or if we
3874 are pipelining. The responses are all handled by sync_responses().
3875 If using CHUNKING, do not send a BDAT until we know how big a chunk we want
3878 if ( !(sx->peer_offered & OPTION_CHUNKING)
3879 && (sx->ok || (pipelining_active && !mua_wrapper)))
3881 int count = smtp_write_command(sx, SCMD_FLUSH, "DATA\r\n");
3883 if (count < 0) goto SEND_FAILED;
3884 switch(sync_responses(sx, count, sx->ok ? +1 : -1))
3886 case 3: sx->ok = TRUE; /* 2xx & 5xx => OK & progress made */
3887 case 2: sx->completed_addr = TRUE; /* 5xx (only) => progress made */
3890 case 1: sx->ok = TRUE; /* 2xx (only) => OK, but if LMTP, */
3891 if (!sx->lmtp) sx->completed_addr = TRUE; /* can't tell about progress yet */
3892 case 0: break; /* No 2xx or 5xx, but no probs */
3894 case -1: goto END_OFF; /* Timeout on RCPT */
3896 #ifndef DISABLE_PIPE_CONNECT
3897 case -5: /* TLS first-read error */
3898 case -4: HDEBUG(D_transport)
3899 debug_printf("failed reaping pipelined cmd responses\n");
3901 default: goto RESPONSE_FAILED; /* I/O error, or any MAIL/DATA error */
3903 pipelining_active = FALSE;
3904 data_command = string_copy(big_buffer); /* Save for later error message */
3907 /* If there were no good recipients (but otherwise there have been no
3908 problems), just set ok TRUE, since we have handled address-specific errors
3909 already. Otherwise, it's OK to send the message. Use the check/escape mechanism
3910 for handling the SMTP dot-handling protocol, flagging to apply to headers as
3911 well as body. Set the appropriate timeout value to be used for each chunk.
3912 (Haven't been able to make it work using select() for writing yet.) */
3915 && (!(sx->peer_offered & OPTION_CHUNKING) || !pipelining_active))
3917 /* Save the first address of the next batch. */
3918 sx->first_addr = sx->next_addr;
3924 transport_ctx tctx = {
3925 .u = {.fd = sx->cctx.sock}, /*XXX will this need TLS info? */
3928 .check_string = US".",
3929 .escape_string = US"..", /* Escaping strings */
3931 topt_use_crlf | topt_escape_headers
3932 | (tblock->body_only ? topt_no_headers : 0)
3933 | (tblock->headers_only ? topt_no_body : 0)
3934 | (tblock->return_path_add ? topt_add_return_path : 0)
3935 | (tblock->delivery_date_add ? topt_add_delivery_date : 0)
3936 | (tblock->envelope_to_add ? topt_add_envelope_to : 0)
3939 /* If using CHUNKING we need a callback from the generic transport
3940 support to us, for the sending of BDAT smtp commands and the reaping
3941 of responses. The callback needs a whole bunch of state so set up
3942 a transport-context structure to be passed around. */
3944 if (sx->peer_offered & OPTION_CHUNKING)
3946 tctx.check_string = tctx.escape_string = NULL;
3947 tctx.options |= topt_use_bdat;
3948 tctx.chunk_cb = smtp_chunk_cmd_callback;
3949 sx->pending_BDAT = FALSE;
3950 sx->good_RCPT = sx->ok;
3952 tctx.smtp_context = sx;
3955 tctx.options |= topt_end_dot;
3957 /* Save the first address of the next batch. */
3958 sx->first_addr = sx->next_addr;
3960 /* Responses from CHUNKING commands go in buffer. Otherwise,
3961 there has not been a response. */
3965 sigalrm_seen = FALSE;
3966 transport_write_timeout = ob->data_timeout;
3967 smtp_command = US"sending data block"; /* For error messages */
3968 DEBUG(D_transport|D_v)
3969 if (sx->peer_offered & OPTION_CHUNKING)
3970 debug_printf(" will write message using CHUNKING\n");
3972 debug_printf(" SMTP>> writing message and terminating \".\"\n");
3973 transport_count = 0;
3975 #ifndef DISABLE_DKIM
3977 # ifdef MEASURE_TIMING
3979 gettimeofday(&t0, NULL);
3981 dkim_exim_sign_init();
3982 # ifdef EXPERIMENTAL_ARC
3984 uschar * s = ob->arc_sign;
3987 if (!(ob->dkim.arc_signspec = s = expand_string(s)))
3989 if (!f.expand_string_forcedfail)
3991 message = US"failed to expand arc_sign";
3998 /* Ask dkim code to hash the body for ARC */
3999 (void) arc_ams_setup_sign_bodyhash();
4000 ob->dkim.force_bodyhash = TRUE;
4005 # ifdef MEASURE_TIMING
4006 report_time_since(&t0, US"dkim_exim_sign_init (delta)");
4011 /* See if we can pipeline QUIT. Reasons not to are
4012 - pipelining not active
4013 - not ok to send quit
4014 - errors in amtp transation responses
4015 - more addrs to send for this message or this host
4016 - this message was being retried
4017 - more messages for this host
4018 If we can, we want the message-write to not flush (the tail end of) its data out. */
4020 if ( sx->pipelining_used
4021 && (sx->ok && sx->completed_addr || sx->peer_offered & OPTION_CHUNKING)
4023 && !(sx->first_addr || f.continue_more)
4024 && f.deliver_firsttime
4027 smtp_compare_t t_compare =
4028 {.tblock = tblock, .current_sender_address = sender_address};
4033 ( tls_out.active.sock < 0 && !continue_proxy_cipher
4034 || verify_check_given_host(CUSS &ob->hosts_nopass_tls, host) != OK
4038 transport_check_waiting(tblock->name, host->name,
4039 tblock->connection_max_messages, new_message_id,
4040 (oicf)smtp_are_same_identities, (void*)&t_compare);
4043 HDEBUG(D_transport) debug_printf("will pipeline QUIT\n");
4044 tctx.options |= topt_no_flush;
4048 #ifndef DISABLE_DKIM
4049 sx->ok = dkim_transport_write_message(&tctx, &ob->dkim, CUSS &message);
4051 sx->ok = transport_write_message(&tctx, 0);
4054 /* transport_write_message() uses write() because it is called from other
4055 places to write to non-sockets. This means that under some OS (e.g. Solaris)
4056 it can exit with "Broken pipe" as its error. This really means that the
4057 socket got closed at the far end. */
4059 transport_write_timeout = 0; /* for subsequent transports */
4061 /* Failure can either be some kind of I/O disaster (including timeout),
4062 or the failure of a transport filter or the expansion of added headers.
4063 Or, when CHUNKING, it can be a protocol-detected failure. */
4066 if (message) goto SEND_FAILED;
4067 else goto RESPONSE_FAILED;
4069 /* We used to send the terminating "." explicitly here, but because of
4070 buffering effects at both ends of TCP/IP connections, you don't gain
4071 anything by keeping it separate, so it might as well go in the final
4072 data buffer for efficiency. This is now done by setting the topt_end_dot
4075 smtp_command = US"end of data";
4077 /* If we can pipeline a QUIT with the data them send it now. If a new message
4078 for this host appeared in the queue while data was being sent, we will not see
4079 it and it will have to wait for a queue run. If there was one but another
4080 thread took it, we might attempt to send it - but locking of spoolfiles will
4081 detect that. Use _MORE to get QUIT in FIN segment. */
4083 if (tcw_done && !tcw)
4085 /*XXX jgh 2021/03/10 google et. al screwup. G, at least, sends TCP FIN in response to TLS
4086 close-notify. Under TLS 1.3, violating RFC.
4087 However, TLS 1.2 does not have half-close semantics. */
4089 if ( sx->cctx.tls_ctx
4090 #if 0 && !defined(DISABLE_TLS)
4091 && Ustrcmp(tls_out.ver, "TLS1.3") != 0
4093 || !f.deliver_firsttime
4095 { /* Send QUIT now and not later */
4096 (void)smtp_write_command(sx, SCMD_FLUSH, "QUIT\r\n");
4097 sx->send_quit = FALSE;
4100 { /* add QUIT to the output buffer */
4101 (void)smtp_write_command(sx, SCMD_MORE, "QUIT\r\n");
4102 sx->send_quit = FALSE; /* avoid sending it later */
4105 if (sx->cctx.tls_ctx) /* need to send TLS Close Notify */
4107 # ifdef EXIM_TCP_CORK /* Use _CORK to get Close Notify in FIN segment */
4108 (void) setsockopt(sx->cctx.sock, IPPROTO_TCP, EXIM_TCP_CORK, US &on, sizeof(on));
4110 tls_shutdown_wr(sx->cctx.tls_ctx);
4111 sx->send_tlsclose = FALSE; /* avoid later repeat */
4114 HDEBUG(D_transport|D_acl|D_v) debug_printf_indent(" SMTP(shutdown)>>\n");
4115 shutdown(sx->cctx.sock, SHUT_WR); /* flush output buffer, with TCP FIN */
4119 if (sx->peer_offered & OPTION_CHUNKING && sx->cmd_count > 1)
4121 /* Reap any outstanding MAIL & RCPT commands, but not a DATA-go-ahead */
4122 switch(sync_responses(sx, sx->cmd_count-1, 0))
4124 case 3: sx->ok = TRUE; /* 2xx & 5xx => OK & progress made */
4125 case 2: sx->completed_addr = TRUE; /* 5xx (only) => progress made */
4128 case 1: sx->ok = TRUE; /* 2xx (only) => OK, but if LMTP, */
4129 if (!sx->lmtp) sx->completed_addr = TRUE; /* can't tell about progress yet */
4130 case 0: break; /* No 2xx or 5xx, but no probs */
4132 case -1: goto END_OFF; /* Timeout on RCPT */
4134 #ifndef DISABLE_PIPE_CONNECT
4135 case -5: /* TLS first-read error */
4136 case -4: HDEBUG(D_transport)
4137 debug_printf("failed reaping pipelined cmd responses\n");
4139 default: goto RESPONSE_FAILED; /* I/O error, or any MAIL/DATA error */
4143 #ifndef DISABLE_PRDR
4144 /* For PRDR we optionally get a partial-responses warning followed by the
4145 individual responses, before going on with the overall response. If we don't
4146 get the warning then deal with per non-PRDR. */
4150 sx->ok = smtp_read_response(sx, sx->buffer, sizeof(sx->buffer), '3', ob->final_timeout);
4151 if (!sx->ok && errno == 0) switch(sx->buffer[0])
4153 case '2': sx->prdr_active = FALSE;
4156 case '4': errno = ERRNO_DATA4XX;
4157 addrlist->more_errno |=
4158 ((sx->buffer[1] - '0')*10 + sx->buffer[2] - '0') << 8;
4165 /* For non-PRDR SMTP, we now read a single response that applies to the
4166 whole message. If it is OK, then all the addresses have been delivered. */
4170 sx->ok = smtp_read_response(sx, sx->buffer, sizeof(sx->buffer), '2',
4172 if (!sx->ok && errno == 0 && sx->buffer[0] == '4')
4174 errno = ERRNO_DATA4XX;
4175 addrlist->more_errno |= ((sx->buffer[1] - '0')*10 + sx->buffer[2] - '0') << 8;
4179 /* For LMTP, we get back a response for every RCPT command that we sent;
4180 some may be accepted and some rejected. For those that get a response, their
4181 status is fixed; any that are accepted have been handed over, even if later
4182 responses crash - at least, that's how I read RFC 2033.
4184 If all went well, mark the recipient addresses as completed, record which
4185 host/IPaddress they were delivered to, and cut out RSET when sending another
4186 message down the same channel. Write the completed addresses to the journal
4187 now so that they are recorded in case there is a crash of hardware or
4188 software before the spool gets updated. Also record the final SMTP
4189 confirmation if needed (for SMTP only). */
4194 struct timeval delivery_time;
4196 uschar * conf = NULL;
4198 timesince(&delivery_time, &sx->delivery_start);
4199 sx->send_rset = FALSE;
4200 pipelining_active = FALSE;
4202 /* Set up confirmation if needed - applies only to SMTP */
4205 #ifdef DISABLE_EVENT
4206 LOGGING(smtp_confirmation) &&
4211 const uschar * s = string_printing(sx->buffer);
4212 /* deconst cast ok here as string_printing was checked to have alloc'n'copied */
4213 conf = s == sx->buffer ? US string_copy(s) : US s;
4216 /* Process all transported addresses - for LMTP or PRDR, read a status for
4217 each one. We used to drop out at first_addr, until someone returned a 452
4218 followed by a 250... and we screwed up the accepted addresses. */
4220 for (address_item * addr = addrlist; addr; addr = addr->next)
4222 if (addr->transport_return != PENDING_OK) continue;
4224 /* LMTP - if the response fails badly (e.g. timeout), use it for all the
4225 remaining addresses. Otherwise, it's a return code for just the one
4226 address. For temporary errors, add a retry item for the address so that
4227 it doesn't get tried again too soon. */
4229 #ifndef DISABLE_PRDR
4230 if (sx->lmtp || sx->prdr_active)
4235 if (!smtp_read_response(sx, sx->buffer, sizeof(sx->buffer), '2',
4238 if (errno != 0 || sx->buffer[0] == 0) goto RESPONSE_FAILED;
4239 addr->message = string_sprintf(
4240 #ifndef DISABLE_PRDR
4241 "%s error after %s: %s", sx->prdr_active ? "PRDR":"LMTP",
4243 "LMTP error after %s: %s",
4245 data_command, string_printing(sx->buffer));
4246 setflag(addr, af_pass_message); /* Allow message to go to user */
4247 if (sx->buffer[0] == '5')
4248 addr->transport_return = FAIL;
4251 errno = ERRNO_DATA4XX;
4252 addr->more_errno |= ((sx->buffer[1] - '0')*10 + sx->buffer[2] - '0') << 8;
4253 addr->transport_return = DEFER;
4254 #ifndef DISABLE_PRDR
4255 if (!sx->prdr_active)
4257 retry_add_item(addr, addr->address_retry_key, 0);
4261 sx->completed_addr = TRUE; /* NOW we can set this flag */
4262 if (LOGGING(smtp_confirmation))
4264 const uschar *s = string_printing(sx->buffer);
4265 /* deconst cast ok here as string_printing was checked to have alloc'n'copied */
4266 conf = (s == sx->buffer) ? US string_copy(s) : US s;
4270 /* SMTP, or success return from LMTP for this address. Pass back the
4271 actual host that was used. */
4273 addr->transport_return = OK;
4274 addr->host_used = host;
4275 addr->delivery_time = delivery_time;
4276 addr->special_action = flag;
4277 addr->message = conf;
4279 if (tcp_out_fastopen)
4281 setflag(addr, af_tcp_fastopen_conn);
4282 if (tcp_out_fastopen >= TFO_USED_NODATA) setflag(addr, af_tcp_fastopen);
4283 if (tcp_out_fastopen >= TFO_USED_DATA) setflag(addr, af_tcp_fastopen_data);
4285 if (sx->pipelining_used) setflag(addr, af_pipelining);
4286 #ifndef DISABLE_PIPE_CONNECT
4287 if (sx->early_pipe_active) setflag(addr, af_early_pipe);
4289 #ifndef DISABLE_PRDR
4290 if (sx->prdr_active) setflag(addr, af_prdr_used);
4292 if (sx->peer_offered & OPTION_CHUNKING) setflag(addr, af_chunking_used);
4295 #ifndef DISABLE_PRDR
4296 if (!sx->prdr_active)
4299 /* Update the journal. For homonymic addresses, use the base address plus
4300 the transport name. See lots of comments in deliver.c about the reasons
4301 for the complications when homonyms are involved. Just carry on after
4302 write error, as it may prove possible to update the spool file later. */
4304 if (testflag(addr, af_homonym))
4305 sprintf(CS sx->buffer, "%.500s/%s\n", addr->unique + 3, tblock->name);
4307 sprintf(CS sx->buffer, "%.500s\n", addr->unique);
4309 DEBUG(D_deliver) debug_printf("S:journalling %s", sx->buffer);
4310 len = Ustrlen(CS sx->buffer);
4311 if (write(journal_fd, sx->buffer, len) != len)
4312 log_write(0, LOG_MAIN|LOG_PANIC, "failed to write journal for "
4313 "%s: %s", sx->buffer, strerror(errno));
4317 #ifndef DISABLE_PRDR
4318 if (sx->prdr_active)
4320 const uschar * overall_message;
4322 /* PRDR - get the final, overall response. For any non-success
4323 upgrade all the address statuses. */
4325 sx->ok = smtp_read_response(sx, sx->buffer, sizeof(sx->buffer), '2',
4329 if(errno == 0 && sx->buffer[0] == '4')
4331 errno = ERRNO_DATA4XX;
4332 addrlist->more_errno |= ((sx->buffer[1] - '0')*10 + sx->buffer[2] - '0') << 8;
4334 for (address_item * addr = addrlist; addr != sx->first_addr; addr = addr->next)
4335 if (sx->buffer[0] == '5' || addr->transport_return == OK)
4336 addr->transport_return = PENDING_OK; /* allow set_errno action */
4337 goto RESPONSE_FAILED;
4340 /* Append the overall response to the individual PRDR response for logging
4341 and update the journal, or setup retry. */
4343 overall_message = string_printing(sx->buffer);
4344 for (address_item * addr = addrlist; addr != sx->first_addr; addr = addr->next)
4345 if (addr->transport_return == OK)
4346 addr->message = string_sprintf("%s\\n%s", addr->message, overall_message);
4348 for (address_item * addr = addrlist; addr != sx->first_addr; addr = addr->next)
4349 if (addr->transport_return == OK)
4351 if (testflag(addr, af_homonym))
4352 sprintf(CS sx->buffer, "%.500s/%s\n", addr->unique + 3, tblock->name);
4354 sprintf(CS sx->buffer, "%.500s\n", addr->unique);
4356 DEBUG(D_deliver) debug_printf("journalling(PRDR) %s\n", sx->buffer);
4357 len = Ustrlen(CS sx->buffer);
4358 if (write(journal_fd, sx->buffer, len) != len)
4359 log_write(0, LOG_MAIN|LOG_PANIC, "failed to write journal for "
4360 "%s: %s", sx->buffer, strerror(errno));
4362 else if (addr->transport_return == DEFER)
4363 retry_add_item(addr, addr->address_retry_key, -2);
4367 /* Ensure the journal file is pushed out to disk. */
4369 if (EXIMfsync(journal_fd) < 0)
4370 log_write(0, LOG_MAIN|LOG_PANIC, "failed to fsync journal: %s",
4376 /* Handle general (not specific to one address) failures here. The value of ok
4377 is used to skip over this code on the falling through case. A timeout causes a
4378 deferral. Other errors may defer or fail according to the response code, and
4379 may set up a special errno value, e.g. after connection chopped, which is
4380 assumed if errno == 0 and there is no text in the buffer. If control reaches
4381 here during the setting up phase (i.e. before MAIL FROM) then always defer, as
4382 the problem is not related to this specific message. */
4387 uschar * set_message;
4393 /* Clear send_quit flag if needed. Do not set. */
4394 sx->send_quit &= check_response(host, &save_errno, addrlist->more_errno,
4395 sx->buffer, &code, &message, &pass_message);
4403 message = string_sprintf("send() to %s [%s] failed: %s",
4404 host->name, host->address, message ? message : US strerror(save_errno));
4405 sx->send_quit = FALSE;
4413 sx->ok = FALSE; /* For when reached by GOTO */
4414 set_message = message;
4416 /* We want to handle timeouts after MAIL or "." and loss of connection after
4417 "." specially. They can indicate a problem with the sender address or with
4418 the contents of the message rather than a real error on the connection. These
4419 cases are treated in the same way as a 4xx response. This next bit of code
4420 does the classification. */
4427 message_error = TRUE;
4431 message_error = Ustrncmp(smtp_command,"MAIL",4) == 0 ||
4432 Ustrncmp(smtp_command,"end ",4) == 0;
4435 case ERRNO_SMTPCLOSED:
4436 message_error = Ustrncmp(smtp_command,"end ",4) == 0;
4440 message_error = FALSE;
4444 /* Handle the cases that are treated as message errors. These are:
4446 (a) negative response or timeout after MAIL
4447 (b) negative response after DATA
4448 (c) negative response or timeout or dropped connection after "."
4449 (d) utf8 support required and not offered
4451 It won't be a negative response or timeout after RCPT, as that is dealt
4452 with separately above. The action in all cases is to set an appropriate
4453 error code for all the addresses, but to leave yield set to OK because the
4454 host itself has not failed. Of course, it might in practice have failed
4455 when we've had a timeout, but if so, we'll discover that at the next
4456 delivery attempt. For a temporary error, set the message_defer flag, and
4457 write to the logs for information if this is not the last host. The error
4458 for the last host will be logged as part of the address's log line. */
4462 if (mua_wrapper) code = '5'; /* Force hard failure in wrapper mode */
4464 /* If there's an errno, the message contains just the identity of
4469 else /* Anything other than 5 is treated as temporary */
4473 message = US string_sprintf("%s: %s", message, strerror(save_errno));
4475 write_logs(host, message, sx->first_addr ? sx->first_addr->basic_errno : 0);
4477 *message_defer = TRUE;
4480 DEBUG(D_transport) if (sx->cctx.sock >= 0)
4483 if (ioctl(sx->cctx.sock, TIOCOUTQ, &n) == 0)
4484 debug_printf("%d bytes remain in socket output buffer\n", n);
4488 /* Otherwise, we have an I/O error or a timeout other than after MAIL or
4489 ".", or some other transportation error. We defer all addresses and yield
4490 DEFER, except for the case of failed add_headers expansion, or a transport
4491 filter failure, when the yield should be ERROR, to stop it trying other
4496 #ifndef DISABLE_PIPE_CONNECT
4497 /* If we were early-pipelinng and the actual EHLO response did not match
4498 the cached value we assumed, we could have detected it and passed a
4499 custom errno through to here. It would be nice to RSET and retry right
4500 away, but to reliably do that we eould need an extra synch point before
4501 we committed to data and that would discard half the gained roundrips.
4502 Or we could summarily drop the TCP connection. but that is also ugly.
4503 Instead, we ignore the possibility (having freshened the cache) and rely
4504 on the server telling us with a nonmessage error if we have tried to
4505 do something it no longer supports. */
4508 yield = (save_errno == ERRNO_CHHEADER_FAIL ||
4509 save_errno == ERRNO_FILTER_FAIL) ? ERROR : DEFER;
4513 set_errno(addrlist, save_errno, set_message, set_rc, pass_message, host,
4514 #ifdef EXPERIMENTAL_DSN_INFO
4515 sx->smtp_greeting, sx->helo_response,
4517 &sx->delivery_start);
4520 /* If all has gone well, send_quit will be set TRUE, implying we can end the
4521 SMTP session tidily. However, if there were too many addresses to send in one
4522 message (indicated by first_addr being non-NULL) we want to carry on with the
4523 rest of them. Also, it is desirable to send more than one message down the SMTP
4524 connection if there are several waiting, provided we haven't already sent so
4525 many as to hit the configured limit. The function transport_check_waiting looks
4526 for a waiting message and returns its id. Then transport_pass_socket tries to
4527 set up a continued delivery by passing the socket on to another process. The
4528 variable send_rset is FALSE if a message has just been successfully transferred.
4530 If we are already sending down a continued channel, there may be further
4531 addresses not yet delivered that are aimed at the same host, but which have not
4532 been passed in this run of the transport. In this case, continue_more will be
4533 true, and all we should do is send RSET if necessary, and return, leaving the
4536 However, if no address was disposed of, i.e. all addresses got 4xx errors, we
4537 do not want to continue with other messages down the same channel, because that
4538 can lead to looping between two or more messages, all with the same,
4539 temporarily failing address(es). [The retry information isn't updated yet, so
4540 new processes keep on trying.] We probably also don't want to try more of this
4541 message's addresses either.
4543 If we have started a TLS session, we have to end it before passing the
4544 connection to a new process. However, not all servers can handle this (Exim
4545 can), so we do not pass such a connection on if the host matches
4546 hosts_nopass_tls. */
4549 debug_printf("ok=%d send_quit=%d send_rset=%d continue_more=%d "
4550 "yield=%d first_address is %sNULL\n", sx->ok, sx->send_quit,
4551 sx->send_rset, f.continue_more, yield, sx->first_addr ? "not " : "");
4553 if (sx->completed_addr && sx->ok && sx->send_quit)
4554 #ifdef EXPERIMENTAL_ESMTP_LIMITS
4555 if (mail_limit = continue_sequence >= sx->max_mail)
4558 debug_printf("reached limit %u for MAILs per conn\n", sx->max_mail);
4563 smtp_compare_t t_compare =
4564 {.tblock = tblock, .current_sender_address = sender_address};
4566 if ( sx->first_addr /* more addrs for this message */
4567 || f.continue_more /* more addrs for continued-host */
4568 || tcw_done && tcw /* more messages for host */
4571 ( tls_out.active.sock < 0 && !continue_proxy_cipher
4572 || verify_check_given_host(CUSS &ob->hosts_nopass_tls, host) != OK
4576 transport_check_waiting(tblock->name, host->name,
4577 sx->max_mail, new_message_id,
4578 (oicf)smtp_are_same_identities, (void*)&t_compare)
4585 if (! (sx->ok = smtp_write_command(sx, SCMD_FLUSH, "RSET\r\n") >= 0))
4587 msg = US string_sprintf("send() to %s [%s] failed: %s", host->name,
4588 host->address, strerror(errno));
4589 sx->send_quit = FALSE;
4591 else if (! (sx->ok = smtp_read_response(sx, sx->buffer, sizeof(sx->buffer),
4592 '2', ob->command_timeout)))
4595 sx->send_quit = check_response(host, &errno, 0, sx->buffer, &code, &msg,
4599 DEBUG(D_transport) debug_printf("H=%s [%s] %s\n",
4600 host->name, host->address, msg);
4604 /* Either RSET was not needed, or it succeeded */
4611 int socket_fd = sx->cctx.sock;
4613 if (sx->first_addr) /* More addresses still to be sent */
4614 { /* for this message */
4615 #ifdef EXPERIMENTAL_ESMTP_LIMITS
4616 /* Any that we marked as skipped, reset to do now */
4617 for (address_item * a = sx->first_addr; a; a = a->next)
4618 if (a->transport_return == SKIP)
4619 a->transport_return = PENDING_DEFER;
4621 continue_sequence++; /* for consistency */
4622 clearflag(sx->first_addr, af_new_conn);
4623 setflag(sx->first_addr, af_cont_conn); /* Causes * in logging */
4624 pipelining_active = sx->pipelining_used; /* was cleared at DATA */
4628 /* Unless caller said it already has more messages listed for this host,
4629 pass the connection on to a new Exim process (below, the call to
4630 transport_pass_socket). If the caller has more ready, just return with
4631 the connection still open. */
4634 if (tls_out.active.sock >= 0)
4635 if ( f.continue_more
4636 || verify_check_given_host(CUSS &ob->hosts_noproxy_tls, host) == OK)
4638 /* Before passing the socket on, or returning to caller with it still
4639 open, we must shut down TLS. Not all MTAs allow for the continuation
4640 of the SMTP session when TLS is shut down. We test for this by sending
4641 a new EHLO. If we don't get a good response, we don't attempt to pass
4644 tls_close(sx->cctx.tls_ctx, TLS_SHUTDOWN_WAIT);
4645 sx->send_tlsclose = FALSE;
4646 sx->cctx.tls_ctx = NULL;
4647 tls_out.active.sock = -1;
4648 smtp_peer_options = smtp_peer_options_wrap;
4650 && smtp_write_command(sx, SCMD_FLUSH, "EHLO %s\r\n", sx->helo_data)
4652 && smtp_read_response(sx, sx->buffer, sizeof(sx->buffer),
4653 '2', ob->command_timeout);
4655 if (sx->ok && f.continue_more)
4656 goto TIDYUP; /* More addresses for another run */
4660 /* Set up a pipe for proxying TLS for the new transport process */
4662 smtp_peer_options |= OPTION_TLS;
4663 if ((sx->ok = socketpair(AF_UNIX, SOCK_STREAM, 0, pfd) == 0))
4666 set_errno(sx->first_addr, errno, US"internal allocation problem",
4668 # ifdef EXPERIMENTAL_DSN_INFO
4669 sx->smtp_greeting, sx->helo_response,
4671 &sx->delivery_start);
4675 if (f.continue_more)
4676 goto TIDYUP; /* More addresses for another run */
4678 /* If the socket is successfully passed, we mustn't send QUIT (or
4679 indeed anything!) from here. */
4681 /*XXX DSN_INFO: assume likely to do new HELO; but for greet we'll want to
4682 propagate it from the initial
4684 if (sx->ok && transport_pass_socket(tblock->name, host->name,
4685 host->address, new_message_id, socket_fd
4686 #ifdef EXPERIMENTAL_ESMTP_LIMITS
4687 , sx->peer_limit_mail, sx->peer_limit_rcpt, sx->peer_limit_rcptdom
4691 sx->send_quit = FALSE;
4693 /* We have passed the client socket to a fresh transport process.
4694 If TLS is still active, we need to proxy it for the transport we
4695 just passed the baton to. Fork a child to to do it, and return to
4696 get logging done asap. Which way to place the work makes assumptions
4697 about post-fork prioritisation which may not hold on all platforms. */
4699 if (tls_out.active.sock >= 0)
4701 int pid = exim_fork(US"tls-proxy-interproc");
4702 if (pid == 0) /* child; fork again to disconnect totally */
4704 /* does not return */
4705 smtp_proxy_tls(sx->cctx.tls_ctx, sx->buffer, sizeof(sx->buffer), pfd,
4706 ob->command_timeout);
4709 if (pid > 0) /* parent */
4712 /* tidy the inter-proc to disconn the proxy proc */
4713 waitpid(pid, NULL, 0);
4714 tls_close(sx->cctx.tls_ctx, TLS_NO_SHUTDOWN);
4715 sx->cctx.tls_ctx = NULL;
4716 (void)close(sx->cctx.sock);
4718 continue_transport = NULL;
4719 continue_hostname = NULL;
4722 log_write(0, LOG_PANIC_DIE, "fork failed");
4728 /* If RSET failed and there are addresses left, they get deferred. */
4730 set_errno(sx->first_addr, errno, msg, DEFER, FALSE, host,
4731 #ifdef EXPERIMENTAL_DSN_INFO
4732 sx->smtp_greeting, sx->helo_response,
4734 &sx->delivery_start);
4738 /* End off tidily with QUIT unless the connection has died or the socket has
4739 been passed to another process. */
4743 { /* Use _MORE to get QUIT in FIN segment */
4744 (void)smtp_write_command(sx, SCMD_MORE, "QUIT\r\n");
4746 if (sx->cctx.tls_ctx)
4748 # ifdef EXIM_TCP_CORK /* Use _CORK to get TLS Close Notify in FIN segment */
4749 (void) setsockopt(sx->cctx.sock, IPPROTO_TCP, EXIM_TCP_CORK, US &on, sizeof(on));
4751 tls_shutdown_wr(sx->cctx.tls_ctx);
4752 sx->send_tlsclose = FALSE;
4759 /* Close the socket, and return the appropriate value, first setting
4760 works because the NULL setting is passed back to the calling process, and
4761 remote_max_parallel is forced to 1 when delivering over an existing connection,
4763 If all went well and continue_more is set, we shouldn't actually get here if
4764 there are further addresses, as the return above will be taken. However,
4765 writing RSET might have failed, or there may be other addresses whose hosts are
4766 specified in the transports, and therefore not visible at top level, in which
4767 case continue_more won't get set. */
4771 /* This flushes data queued in the socket, being the QUIT and any TLS Close,
4772 sending them along with the client FIN flag. Us (we hope) sending FIN first
4773 means we (client) take the TIME_WAIT state, so the server (which likely has a
4774 higher connection rate) does not have to. */
4776 HDEBUG(D_transport|D_acl|D_v) debug_printf_indent(" SMTP(shutdown)>>\n");
4777 shutdown(sx->cctx.sock, SHUT_WR);
4780 if (sx->send_quit || tcw_done && !tcw)
4782 /* Wait for (we hope) ack of our QUIT, and a server FIN. Discard any data
4783 received, then discard the socket. Any packet received after then, or receive
4784 data still in the socket, will get a RST - hence the pause/drain. */
4786 /* Reap the response to QUIT, timing out after one second */
4787 (void) smtp_read_response(sx, sx->buffer, sizeof(sx->buffer), '2', 1);
4789 if (sx->cctx.tls_ctx)
4793 /* Reap the TLS Close Notify from the server, timing out after one second */
4794 sigalrm_seen = FALSE;
4797 n = tls_read(sx->cctx.tls_ctx, sx->inbuffer, sizeof(sx->inbuffer));
4798 while (!sigalrm_seen && n > 0);
4801 # ifdef EXIM_TCP_CORK
4802 (void) setsockopt(sx->cctx.sock, IPPROTO_TCP, EXIM_TCP_CORK, US &on, sizeof(on));
4804 tls_close(sx->cctx.tls_ctx, TLS_SHUTDOWN_WAIT);
4805 sx->cctx.tls_ctx = NULL;
4809 if (fcntl(sx->cctx.sock, F_SETFL, O_NONBLOCK) == 0)
4810 for (int i = 16, n; /* drain socket */
4811 (n = read(sx->cctx.sock, sx->inbuffer, sizeof(sx->inbuffer))) > 0 && i > 0;
4812 i--) HDEBUG(D_transport|D_acl|D_v)
4815 debug_printf_indent(" SMTP(drain %d bytes)<< %.*s\n", n, m, sx->inbuffer);
4816 for (m = 0; m < n; m++)
4817 debug_printf("0x%02x\n", sx->inbuffer[m]);
4820 HDEBUG(D_transport|D_acl|D_v) debug_printf_indent(" SMTP(close)>>\n");
4821 (void)close(sx->cctx.sock);
4823 continue_transport = NULL;
4824 continue_hostname = NULL;
4826 #ifndef DISABLE_EVENT
4827 (void) event_raise(tblock->event_action, US"tcp:close", NULL);
4833 sx->first_addr = NULL;
4834 for (address_item * a = sx->addrlist->next; a; a = a->next)
4835 if (a->transport_return == DANE)
4837 a->transport_return = PENDING_DEFER;
4838 if (!sx->first_addr)
4840 /* Remember the new start-point in the addrlist, for smtp_setup_conn()
4841 to get the domain string for SNI */
4844 clearflag(a, af_cont_conn);
4845 setflag(a, af_new_conn); /* clear * from logging */
4846 DEBUG(D_transport) debug_printf("DANE: go-around for %s\n", a->domain);
4849 continue_sequence = 1; /* for consistency */
4854 #ifdef EXPERIMENTAL_ESMTP_LIMITS
4855 if (mail_limit && sx->first_addr)
4857 /* Reset the sequence count since we closed the connection. This is flagged
4858 on the pipe back to the delivery process so that a non-continued-conn delivery
4861 continue_sequence = 1; /* for consistency */
4862 clearflag(sx->first_addr, af_cont_conn);
4863 setflag(sx->first_addr, af_new_conn); /* clear * from logging */
4872 if (dane_held) for (address_item * a = sx->addrlist->next; a; a = a->next)
4873 if (a->transport_return == DANE)
4874 a->transport_return = PENDING_DEFER;
4882 /*************************************************
4883 * Closedown entry point *
4884 *************************************************/
4886 /* This function is called when exim is passed an open smtp channel
4887 from another incarnation, but the message which it has been asked
4888 to deliver no longer exists. The channel is on stdin.
4890 We might do fancy things like looking for another message to send down
4891 the channel, but if the one we sought has gone, it has probably been
4892 delivered by some other process that itself will seek further messages,
4893 so just close down our connection.
4895 Argument: pointer to the transport instance block
4900 smtp_transport_closedown(transport_instance *tblock)
4902 smtp_transport_options_block * ob = SOB tblock->options_block;
4903 client_conn_ctx cctx;
4906 uschar inbuffer[4096];
4907 uschar outbuffer[16];
4909 /*XXX really we need an active-smtp-client ctx, rather than assuming stdout */
4910 cctx.sock = fileno(stdin);
4911 cctx.tls_ctx = cctx.sock == tls_out.active.sock ? tls_out.active.tls_ctx : NULL;
4913 sx.inblock.cctx = &cctx;
4914 sx.inblock.buffer = inbuffer;
4915 sx.inblock.buffersize = sizeof(inbuffer);
4916 sx.inblock.ptr = inbuffer;
4917 sx.inblock.ptrend = inbuffer;
4919 sx.outblock.cctx = &cctx;
4920 sx.outblock.buffersize = sizeof(outbuffer);
4921 sx.outblock.buffer = outbuffer;
4922 sx.outblock.ptr = outbuffer;
4923 sx.outblock.cmd_count = 0;
4924 sx.outblock.authenticating = FALSE;
4926 (void)smtp_write_command(&sx, SCMD_FLUSH, "QUIT\r\n");
4927 (void)smtp_read_response(&sx, buffer, sizeof(buffer), '2', ob->command_timeout);
4928 (void)close(cctx.sock);
4933 /*************************************************
4934 * Prepare addresses for delivery *
4935 *************************************************/
4937 /* This function is called to flush out error settings from previous delivery
4938 attempts to other hosts. It also records whether we got here via an MX record
4939 or not in the more_errno field of the address. We are interested only in
4940 addresses that are still marked DEFER - others may have got delivered to a
4941 previously considered IP address. Set their status to PENDING_DEFER to indicate
4942 which ones are relevant this time.
4945 addrlist the list of addresses
4946 host the host we are delivering to
4948 Returns: the first address for this delivery
4951 static address_item *
4952 prepare_addresses(address_item *addrlist, host_item *host)
4954 address_item *first_addr = NULL;
4955 for (address_item * addr = addrlist; addr; addr = addr->next)
4956 if (addr->transport_return == DEFER)
4958 if (!first_addr) first_addr = addr;
4959 addr->transport_return = PENDING_DEFER;
4960 addr->basic_errno = 0;
4961 addr->more_errno = (host->mx >= 0)? 'M' : 'A';
4962 addr->message = NULL;
4964 addr->cipher = NULL;
4965 addr->ourcert = NULL;
4966 addr->peercert = NULL;
4967 addr->peerdn = NULL;
4968 addr->ocsp = OCSP_NOT_REQ;
4969 addr->tlsver = NULL;
4971 #ifdef EXPERIMENTAL_DSN_INFO
4972 addr->smtp_greeting = NULL;
4973 addr->helo_response = NULL;
4981 /*************************************************
4982 * Main entry point *
4983 *************************************************/
4985 /* See local README for interface details. As this is a remote transport, it is
4986 given a chain of addresses to be delivered in one connection, if possible. It
4987 always returns TRUE, indicating that each address has its own independent
4988 status set, except if there is a setting up problem, in which case it returns
4992 smtp_transport_entry(
4993 transport_instance *tblock, /* data for this instantiation */
4994 address_item *addrlist) /* addresses we are working on */
4997 int hosts_defer = 0;
4999 int hosts_looked_up = 0;
5000 int hosts_retry = 0;
5001 int hosts_serial = 0;
5002 int hosts_total = 0;
5003 int total_hosts_tried = 0;
5004 BOOL expired = TRUE;
5005 uschar *expanded_hosts = NULL;
5007 uschar *tid = string_sprintf("%s transport", tblock->name);
5008 smtp_transport_options_block *ob = SOB tblock->options_block;
5009 host_item *hostlist = addrlist->host_list;
5010 host_item *host = NULL;
5014 debug_printf("%s transport entered\n", tblock->name);
5015 for (address_item * addr = addrlist; addr; addr = addr->next)
5016 debug_printf(" %s\n", addr->address);
5019 debug_printf("hostlist:\n");
5020 for (host_item * host = hostlist; host; host = host->next)
5021 debug_printf(" '%s' IP %s port %d\n", host->name, host->address, host->port);
5023 if (continue_hostname)
5024 debug_printf("already connected to %s [%s] (on fd %d)\n",
5025 continue_hostname, continue_host_address,
5026 cutthrough.cctx.sock >= 0 ? cutthrough.cctx.sock : 0);
5029 /* Check the restrictions on line length */
5031 if (max_received_linelength > ob->message_linelength_limit)
5034 gettimeofday(&now, NULL);
5036 for (address_item * addr = addrlist; addr; addr = addr->next)
5037 if (addr->transport_return == DEFER)
5038 addr->transport_return = PENDING_DEFER;
5040 set_errno_nohost(addrlist, ERRNO_SMTPFORMAT,
5041 US"message has lines too long for transport", FAIL, TRUE, &now);
5045 /* Set the flag requesting that these hosts be added to the waiting
5046 database if the delivery fails temporarily or if we are running with
5047 queue_smtp or a 2-stage queue run. This gets unset for certain
5048 kinds of error, typically those that are specific to the message. */
5050 update_waiting = TRUE;
5052 /* If a host list is not defined for the addresses - they must all have the
5053 same one in order to be passed to a single transport - or if the transport has
5054 a host list with hosts_override set, use the host list supplied with the
5055 transport. It is an error for this not to exist. */
5057 if (!hostlist || (ob->hosts_override && ob->hosts))
5061 addrlist->message = string_sprintf("%s transport called with no hosts set",
5063 addrlist->transport_return = PANIC;
5064 return FALSE; /* Only top address has status */
5067 DEBUG(D_transport) debug_printf("using the transport's hosts: %s\n",
5070 /* If the transport's host list contains no '$' characters, and we are not
5071 randomizing, it is fixed and therefore a chain of hosts can be built once
5072 and for all, and remembered for subsequent use by other calls to this
5073 transport. If, on the other hand, the host list does contain '$', or we are
5074 randomizing its order, we have to rebuild it each time. In the fixed case,
5075 as the hosts string will never be used again, it doesn't matter that we
5076 replace all the : characters with zeros. */
5080 uschar *s = ob->hosts;
5082 if (Ustrchr(s, '$'))
5084 if (!(expanded_hosts = expand_string(s)))
5086 addrlist->message = string_sprintf("failed to expand list of hosts "
5087 "\"%s\" in %s transport: %s", s, tblock->name, expand_string_message);
5088 addrlist->transport_return = f.search_find_defer ? DEFER : PANIC;
5089 return FALSE; /* Only top address has status */
5091 DEBUG(D_transport) debug_printf("expanded list of hosts \"%s\" to "
5092 "\"%s\"\n", s, expanded_hosts);
5096 if (ob->hosts_randomize) s = expanded_hosts = string_copy(s);
5098 if (is_tainted2(s, LOG_MAIN|LOG_PANIC, "Tainted host list '%s' from '%s' in transport %s", s, ob->hosts, tblock->name))
5100 /* Avoid leaking info to an attacker */
5101 addrlist->message = US"internal configuration error";
5102 addrlist->transport_return = PANIC;
5106 host_build_hostlist(&hostlist, s, ob->hosts_randomize);
5108 /* Check that the expansion yielded something useful. */
5112 string_sprintf("%s transport has empty hosts setting", tblock->name);
5113 addrlist->transport_return = PANIC;
5114 return FALSE; /* Only top address has status */
5117 /* If there was no expansion of hosts, save the host list for
5120 if (!expanded_hosts) ob->hostlist = hostlist;
5123 /* This is not the first time this transport has been run in this delivery;
5124 the host list was built previously. */
5127 hostlist = ob->hostlist;
5130 /* The host list was supplied with the address. If hosts_randomize is set, we
5131 must sort it into a random order if it did not come from MX records and has not
5132 already been randomized (but don't bother if continuing down an existing
5135 else if (ob->hosts_randomize && hostlist->mx == MX_NONE && !continue_hostname)
5137 host_item *newlist = NULL;
5140 host_item *h = hostlist;
5141 hostlist = hostlist->next;
5143 h->sort_key = random_number(100);
5150 else if (h->sort_key < newlist->sort_key)
5157 host_item *hh = newlist;
5160 if (h->sort_key < hh->next->sort_key) break;
5168 hostlist = addrlist->host_list = newlist;
5171 /* Sort out the default port. */
5173 if (!smtp_get_port(ob->port, addrlist, &defport, tid)) return FALSE;
5175 /* For each host-plus-IP-address on the list:
5177 . If this is a continued delivery and the host isn't the one with the
5178 current connection, skip.
5180 . If the status is unusable (i.e. previously failed or retry checked), skip.
5182 . If no IP address set, get the address, either by turning the name into
5183 an address, calling gethostbyname if gethostbyname is on, or by calling
5184 the DNS. The DNS may yield multiple addresses, in which case insert the
5185 extra ones into the list.
5187 . Get the retry data if not previously obtained for this address and set the
5188 field which remembers the state of this address. Skip if the retry time is
5189 not reached. If not, remember whether retry data was found. The retry string
5190 contains both the name and the IP address.
5192 . Scan the list of addresses and mark those whose status is DEFER as
5193 PENDING_DEFER. These are the only ones that will be processed in this cycle
5196 . Make a delivery attempt - addresses marked PENDING_DEFER will be tried.
5197 Some addresses may be successfully delivered, others may fail, and yet
5198 others may get temporary errors and so get marked DEFER.
5200 . The return from the delivery attempt is OK if a connection was made and a
5201 valid SMTP dialogue was completed. Otherwise it is DEFER.
5203 . If OK, add a "remove" retry item for this host/IPaddress, if any.
5205 . If fail to connect, or other defer state, add a retry item.
5207 . If there are any addresses whose status is still DEFER, carry on to the
5208 next host/IPaddress, unless we have tried the number of hosts given
5209 by hosts_max_try or hosts_max_try_hardlimit; otherwise return. Note that
5210 there is some fancy logic for hosts_max_try that means its limit can be
5211 overstepped in some circumstances.
5213 If we get to the end of the list, all hosts have deferred at least one address,
5214 or not reached their retry times. If delay_after_cutoff is unset, it requests a
5215 delivery attempt to those hosts whose last try was before the arrival time of
5216 the current message. To cope with this, we have to go round the loop a second
5217 time. After that, set the status and error data for any addresses that haven't
5218 had it set already. */
5220 for (int cutoff_retry = 0;
5221 expired && cutoff_retry < (ob->delay_after_cutoff ? 1 : 2);
5224 host_item *nexthost = NULL;
5225 int unexpired_hosts_tried = 0;
5226 BOOL continue_host_tried = FALSE;
5228 retry_non_continued:
5229 for (host = hostlist;
5231 && unexpired_hosts_tried < ob->hosts_max_try
5232 && total_hosts_tried < ob->hosts_max_try_hardlimit;
5237 BOOL host_is_expired = FALSE;
5238 BOOL message_defer = FALSE;
5239 BOOL some_deferred = FALSE;
5240 address_item *first_addr = NULL;
5241 uschar *interface = NULL;
5242 uschar *retry_host_key = NULL;
5243 uschar *retry_message_key = NULL;
5244 uschar *serialize_key = NULL;
5246 /* Default next host is next host. :-) But this can vary if the
5247 hosts_max_try limit is hit (see below). It may also be reset if a host
5248 address is looked up here (in case the host was multihomed). */
5250 nexthost = host->next;
5252 /* If the address hasn't yet been obtained from the host name, look it up
5253 now, unless the host is already marked as unusable. If it is marked as
5254 unusable, it means that the router was unable to find its IP address (in
5255 the DNS or wherever) OR we are in the 2nd time round the cutoff loop, and
5256 the lookup failed last time. We don't get this far if *all* MX records
5257 point to non-existent hosts; that is treated as a hard error.
5259 We can just skip this host entirely. When the hosts came from the router,
5260 the address will timeout based on the other host(s); when the address is
5261 looked up below, there is an explicit retry record added.
5263 Note that we mustn't skip unusable hosts if the address is not unset; they
5264 may be needed as expired hosts on the 2nd time round the cutoff loop. */
5268 int new_port, flags;
5270 if (host->status >= hstatus_unusable)
5272 DEBUG(D_transport) debug_printf("%s has no address and is unusable - skipping\n",
5277 DEBUG(D_transport) debug_printf("getting address for %s\n", host->name);
5279 /* The host name is permitted to have an attached port. Find it, and
5280 strip it from the name. Just remember it for now. */
5282 new_port = host_item_get_port(host);
5284 /* Count hosts looked up */
5288 /* Find by name if so configured, or if it's an IP address. We don't
5289 just copy the IP address, because we need the test-for-local to happen. */
5291 flags = HOST_FIND_BY_A | HOST_FIND_BY_AAAA;
5292 if (ob->dns_qualify_single) flags |= HOST_FIND_QUALIFY_SINGLE;
5293 if (ob->dns_search_parents) flags |= HOST_FIND_SEARCH_PARENTS;
5295 if (ob->gethostbyname || string_is_ip_address(host->name, NULL) != 0)
5296 rc = host_find_byname(host, NULL, flags, NULL, TRUE);
5298 rc = host_find_bydns(host, NULL, flags, NULL, NULL, NULL,
5299 &ob->dnssec, /* domains for request/require */
5302 /* Update the host (and any additional blocks, resulting from
5303 multihoming) with a host-specific port, if any. */
5305 for (host_item * hh = host; hh != nexthost; hh = hh->next) hh->port = new_port;
5307 /* Failure to find the host at this time (usually DNS temporary failure)
5308 is really a kind of routing failure rather than a transport failure.
5309 Therefore we add a retry item of the routing kind, not to stop us trying
5310 to look this name up here again, but to ensure the address gets timed
5311 out if the failures go on long enough. A complete failure at this point
5312 commonly points to a configuration error, but the best action is still
5313 to carry on for the next host. */
5315 if (rc == HOST_FIND_AGAIN || rc == HOST_FIND_SECURITY || rc == HOST_FIND_FAILED)
5317 retry_add_item(addrlist, string_sprintf("R:%s", host->name), 0);
5319 if (rc == HOST_FIND_AGAIN) hosts_defer++; else hosts_fail++;
5320 DEBUG(D_transport) debug_printf("rc = %s for %s\n", (rc == HOST_FIND_AGAIN)?
5321 "HOST_FIND_AGAIN" : "HOST_FIND_FAILED", host->name);
5322 host->status = hstatus_unusable;
5324 for (address_item * addr = addrlist; addr; addr = addr->next)
5326 if (addr->transport_return != DEFER) continue;
5327 addr->basic_errno = ERRNO_UNKNOWNHOST;
5328 addr->message = string_sprintf(
5329 rc == HOST_FIND_SECURITY
5330 ? "lookup of IP address for %s was insecure"
5331 : "failed to lookup IP address for %s",
5337 /* If the host is actually the local host, we may have a problem, or
5338 there may be some cunning configuration going on. In the problem case,
5339 log things and give up. The default transport status is already DEFER. */
5341 if (rc == HOST_FOUND_LOCAL && !ob->allow_localhost)
5343 for (address_item * addr = addrlist; addr; addr = addr->next)
5345 addr->basic_errno = ERRNO_HOST_IS_LOCAL;
5346 addr->message = string_sprintf("%s transport found host %s to be "
5347 "local", tblock->name, host->name);
5351 } /* End of block for IP address lookup */
5353 /* If this is a continued delivery, we are interested only in the host
5354 which matches the name of the existing open channel. The check is put
5355 here after the local host lookup, in case the name gets expanded as a
5356 result of the lookup. Set expired FALSE, to save the outer loop executing
5359 if (continue_hostname)
5360 if ( Ustrcmp(continue_hostname, host->name) != 0
5361 || Ustrcmp(continue_host_address, host->address) != 0
5365 continue; /* With next host */
5368 continue_host_tried = TRUE;
5370 /* Reset the default next host in case a multihomed host whose addresses
5371 are not looked up till just above added to the host list. */
5373 nexthost = host->next;
5375 /* If queue_smtp is set (-odqs or the first part of a 2-stage run), or the
5376 domain is in queue_smtp_domains, we don't actually want to attempt any
5377 deliveries. When doing a queue run, queue_smtp_domains is always unset. If
5378 there is a lookup defer in queue_smtp_domains, proceed as if the domain
5379 were not in it. We don't want to hold up all SMTP deliveries! Except when
5380 doing a two-stage queue run, don't do this if forcing. */
5382 if ( (!f.deliver_force || f.queue_2stage)
5384 || match_isinlist(addrlist->domain,
5385 CUSS &queue_smtp_domains, 0,
5386 &domainlist_anchor, NULL, MCL_DOMAIN, TRUE, NULL) == OK)
5389 DEBUG(D_transport) debug_printf("first-pass routing only\n");
5391 for (address_item * addr = addrlist; addr; addr = addr->next)
5392 if (addr->transport_return == DEFER)
5393 addr->message = US"first-pass only routing due to -odqs, "
5394 "queue_smtp_domains or control=queue";
5395 continue; /* With next host */
5398 /* Count hosts being considered - purely for an intelligent comment
5399 if none are usable. */
5403 /* Set $host and $host address now in case they are needed for the
5404 interface expansion or the serialize_hosts check; they remain set if an
5405 actual delivery happens. */
5407 deliver_host = host->name;
5408 deliver_host_address = host->address;
5409 lookup_dnssec_authenticated = host->dnssec == DS_YES ? US"yes"
5410 : host->dnssec == DS_NO ? US"no"
5413 /* Set up a string for adding to the retry key if the port number is not
5414 the standard SMTP port. A host may have its own port setting that overrides
5417 pistring = string_sprintf(":%d", host->port == PORT_NONE
5418 ? defport : host->port);
5419 if (Ustrcmp(pistring, ":25") == 0) pistring = US"";
5421 /* Select IPv4 or IPv6, and choose an outgoing interface. If the interface
5422 string is set, even if constant (as different transports can have different
5423 constant settings), we must add it to the key that is used for retries,
5424 because connections to the same host from a different interface should be
5425 treated separately. */
5427 host_af = Ustrchr(host->address, ':') ? AF_INET6 : AF_INET;
5429 uschar * s = ob->interface;
5432 if (!smtp_get_interface(s, host_af, addrlist, &interface, tid))
5434 pistring = string_sprintf("%s/%s", pistring, interface);
5438 /* The first time round the outer loop, check the status of the host by
5439 inspecting the retry data. The second time round, we are interested only
5440 in expired hosts that haven't been tried since this message arrived. */
5442 if (cutoff_retry == 0)
5445 /* Ensure the status of the address is set by checking retry data if
5446 necessary. There may be host-specific retry data (applicable to all
5447 messages) and also data for retries of a specific message at this host.
5448 If either of these retry records are actually read, the keys used are
5449 returned to save recomputing them later. */
5451 if (exp_bool(addrlist, US"transport", tblock->name, D_transport,
5452 US"retry_include_ip_address", ob->retry_include_ip_address,
5453 ob->expand_retry_include_ip_address, &incl_ip) != OK)
5454 continue; /* with next host */
5456 host_is_expired = retry_check_address(addrlist->domain, host, pistring,
5457 incl_ip, &retry_host_key, &retry_message_key);
5459 DEBUG(D_transport) debug_printf("%s [%s]%s retry-status = %s\n", host->name,
5460 host->address ? host->address : US"", pistring,
5461 host->status == hstatus_usable ? "usable"
5462 : host->status == hstatus_unusable ? "unusable"
5463 : host->status == hstatus_unusable_expired ? "unusable (expired)" : "?");
5465 /* Skip this address if not usable at this time, noting if it wasn't
5466 actually expired, both locally and in the address. */
5468 switch (host->status)
5470 case hstatus_unusable:
5472 setflag(addrlist, af_retry_skipped);
5475 case hstatus_unusable_expired:
5478 case hwhy_retry: hosts_retry++; break;
5479 case hwhy_failed: hosts_fail++; break;
5481 case hwhy_deferred: hosts_defer++; break;
5484 /* If there was a retry message key, implying that previously there
5485 was a message-specific defer, we don't want to update the list of
5486 messages waiting for these hosts. */
5488 if (retry_message_key) update_waiting = FALSE;
5489 continue; /* With the next host or IP address */
5493 /* Second time round the loop: if the address is set but expired, and
5494 the message is newer than the last try, let it through. */
5499 || host->status != hstatus_unusable_expired
5500 || host->last_try > received_time.tv_sec)
5502 DEBUG(D_transport) debug_printf("trying expired host %s [%s]%s\n",
5503 host->name, host->address, pistring);
5504 host_is_expired = TRUE;
5507 /* Setting "expired=FALSE" doesn't actually mean not all hosts are expired;
5508 it remains TRUE only if all hosts are expired and none are actually tried.
5513 /* If this host is listed as one to which access must be serialized,
5514 see if another Exim process has a connection to it, and if so, skip
5515 this host. If not, update the database to record our connection to it
5516 and remember this for later deletion. Do not do any of this if we are
5517 sending the message down a pre-existing connection. */
5519 if ( !continue_hostname
5520 && verify_check_given_host(CUSS &ob->serialize_hosts, host) == OK)
5522 serialize_key = string_sprintf("host-serialize-%s", host->name);
5523 if (!enq_start(serialize_key, 1))
5526 debug_printf("skipping host %s because another Exim process "
5527 "is connected to it\n", host->name);
5533 /* OK, we have an IP address that is not waiting for its retry time to
5534 arrive (it might be expired) OR (second time round the loop) we have an
5535 expired host that hasn't been tried since the message arrived. Have a go
5536 at delivering the message to it. First prepare the addresses by flushing
5537 out the result of previous attempts, and finding the first address that
5538 is still to be delivered. */
5540 first_addr = prepare_addresses(addrlist, host);
5542 DEBUG(D_transport) debug_printf("delivering %s to %s [%s] (%s%s)\n",
5543 message_id, host->name, host->address, addrlist->address,
5544 addrlist->next ? ", ..." : "");
5546 set_process_info("delivering %s to %s [%s]%s (%s%s)",
5547 message_id, host->name, host->address, pistring, addrlist->address,
5548 addrlist->next ? ", ..." : "");
5550 /* This is not for real; don't do the delivery. If there are
5551 any remaining hosts, list them. */
5556 gettimeofday(&now, NULL);
5557 set_errno_nohost(addrlist, 0, NULL, OK, FALSE, &now);
5558 for (address_item * addr = addrlist; addr; addr = addr->next)
5560 addr->host_used = host;
5561 addr->special_action = '*';
5562 addr->message = US"delivery bypassed by -N option";
5566 debug_printf("*** delivery by %s transport bypassed by -N option\n"
5567 "*** host and remaining hosts:\n", tblock->name);
5568 for (host_item * host2 = host; host2; host2 = host2->next)
5569 debug_printf(" %s [%s]\n", host2->name,
5570 host2->address ? host2->address : US"unset");
5575 /* This is for real. If the host is expired, we don't count it for
5576 hosts_max_retry. This ensures that all hosts must expire before an address
5577 is timed out, unless hosts_max_try_hardlimit (which protects against
5578 lunatic DNS configurations) is reached.
5580 If the host is not expired and we are about to hit the hosts_max_retry
5581 limit, check to see if there is a subsequent hosts with a different MX
5582 value. If so, make that the next host, and don't count this one. This is a
5583 heuristic to make sure that different MXs do get tried. With a normal kind
5584 of retry rule, they would get tried anyway when the earlier hosts were
5585 delayed, but if the domain has a "retry every time" type of rule - as is
5586 often used for the the very large ISPs, that won't happen. */
5591 /* Make a copy of the host if it is local to this invocation
5592 of the transport. */
5596 thost = store_get(sizeof(host_item), FALSE);
5598 thost->name = string_copy(host->name);
5599 thost->address = string_copy(host->address);
5604 if (!host_is_expired && ++unexpired_hosts_tried >= ob->hosts_max_try)
5607 debug_printf("hosts_max_try limit reached with this host\n");
5608 for (host_item * h = host; h; h = h->next) if (h->mx != host->mx)
5611 unexpired_hosts_tried--;
5612 DEBUG(D_transport) debug_printf("however, a higher MX host exists "
5613 "and will be tried\n");
5618 /* Attempt the delivery. */
5620 total_hosts_tried++;
5621 rc = smtp_deliver(addrlist, thost, host_af, defport, interface, tblock,
5622 &message_defer, FALSE);
5625 OK => connection made, each address contains its result;
5626 message_defer is set for message-specific defers (when all
5627 recipients are marked defer)
5628 DEFER => there was a non-message-specific delivery problem;
5629 ERROR => there was a problem setting up the arguments for a filter,
5630 or there was a problem with expanding added headers
5633 /* If the result is not OK, there was a non-message-specific problem.
5634 If the result is DEFER, we need to write to the logs saying what happened
5635 for this particular host, except in the case of authentication and TLS
5636 failures, where the log has already been written. If all hosts defer a
5637 general message is written at the end. */
5639 if (rc == DEFER && first_addr->basic_errno != ERRNO_AUTHFAIL
5640 && first_addr->basic_errno != ERRNO_TLSFAILURE)
5641 write_logs(host, first_addr->message, first_addr->basic_errno);
5643 #ifndef DISABLE_EVENT
5645 deferred_event_raise(first_addr, host, US"msg:host:defer");
5648 /* If STARTTLS was accepted, but there was a failure in setting up the
5649 TLS session (usually a certificate screwup), and the host is not in
5650 hosts_require_tls, and tls_tempfail_tryclear is true, try again, with
5651 TLS forcibly turned off. We have to start from scratch with a new SMTP
5652 connection. That's why the retry is done from here, not from within
5653 smtp_deliver(). [Rejections of STARTTLS itself don't screw up the
5654 session, so the in-clear transmission after those errors, if permitted,
5655 happens inside smtp_deliver().] */
5659 && first_addr->basic_errno == ERRNO_TLSFAILURE
5660 && ob->tls_tempfail_tryclear
5661 && verify_check_given_host(CUSS &ob->hosts_require_tls, host) != OK
5664 log_write(0, LOG_MAIN,
5665 "%s: delivering unencrypted to H=%s [%s] (not in hosts_require_tls)",
5666 first_addr->message, host->name, host->address);
5667 first_addr = prepare_addresses(addrlist, host);
5668 rc = smtp_deliver(addrlist, thost, host_af, defport, interface, tblock,
5669 &message_defer, TRUE);
5670 if (rc == DEFER && first_addr->basic_errno != ERRNO_AUTHFAIL)
5671 write_logs(host, first_addr->message, first_addr->basic_errno);
5672 # ifndef DISABLE_EVENT
5674 deferred_event_raise(first_addr, host, US"msg:host:defer");
5677 #endif /*DISABLE_TLS*/
5679 #ifndef DISABLE_EVENT
5680 /* If the last host gave a defer raise a per-message event */
5683 && unexpired_hosts_tried < ob->hosts_max_try
5684 && total_hosts_tried < ob->hosts_max_try_hardlimit
5686 && (message_defer || rc == DEFER)
5688 deferred_event_raise(first_addr, host, US"msg:defer");
5692 /* Delivery attempt finished */
5694 set_process_info("delivering %s: just tried %s [%s]%s for %s%s: result %s",
5695 message_id, host->name, host->address, pistring, addrlist->address,
5696 addrlist->next ? " (& others)" : "", rc_to_string(rc));
5698 /* Release serialization if set up */
5700 if (serialize_key) enq_end(serialize_key);
5702 /* If the result is DEFER, or if a host retry record is known to exist, we
5703 need to add an item to the retry chain for updating the retry database
5704 at the end of delivery. We only need to add the item to the top address,
5705 of course. Also, if DEFER, we mark the IP address unusable so as to skip it
5706 for any other delivery attempts using the same address. (It is copied into
5707 the unusable tree at the outer level, so even if different address blocks
5708 contain the same address, it still won't get tried again.) */
5710 if (rc == DEFER || retry_host_key)
5712 int delete_flag = rc != DEFER ? rf_delete : 0;
5713 if (!retry_host_key)
5716 if (exp_bool(addrlist, US"transport", tblock->name, D_transport,
5717 US"retry_include_ip_address", ob->retry_include_ip_address,
5718 ob->expand_retry_include_ip_address, &incl_ip) != OK)
5719 incl_ip = TRUE; /* error; use most-specific retry record */
5721 retry_host_key = incl_ip
5722 ? string_sprintf("T:%S:%s%s", host->name, host->address, pistring)
5723 : string_sprintf("T:%S%s", host->name, pistring);
5726 /* If a delivery of another message over an existing SMTP connection
5727 yields DEFER, we do NOT set up retry data for the host. This covers the
5728 case when there are delays in routing the addresses in the second message
5729 that are so long that the server times out. This is alleviated by not
5730 routing addresses that previously had routing defers when handling an
5731 existing connection, but even so, this case may occur (e.g. if a
5732 previously happily routed address starts giving routing defers). If the
5733 host is genuinely down, another non-continued message delivery will
5734 notice it soon enough. */
5736 if (delete_flag != 0 || !continue_hostname)
5737 retry_add_item(first_addr, retry_host_key, rf_host | delete_flag);
5739 /* We may have tried an expired host, if its retry time has come; ensure
5740 the status reflects the expiry for the benefit of any other addresses. */
5744 host->status = host_is_expired
5745 ? hstatus_unusable_expired : hstatus_unusable;
5746 host->why = hwhy_deferred;
5750 /* If message_defer is set (host was OK, but every recipient got deferred
5751 because of some message-specific problem), or if that had happened
5752 previously so that a message retry key exists, add an appropriate item
5753 to the retry chain. Note that if there was a message defer but now there is
5754 a host defer, the message defer record gets deleted. That seems perfectly
5755 reasonable. Also, stop the message from being remembered as waiting
5756 for specific hosts. */
5758 if (message_defer || retry_message_key)
5760 int delete_flag = message_defer ? 0 : rf_delete;
5761 if (!retry_message_key)
5764 if (exp_bool(addrlist, US"transport", tblock->name, D_transport,
5765 US"retry_include_ip_address", ob->retry_include_ip_address,
5766 ob->expand_retry_include_ip_address, &incl_ip) != OK)
5767 incl_ip = TRUE; /* error; use most-specific retry record */
5769 retry_message_key = incl_ip
5770 ? string_sprintf("T:%S:%s%s:%s", host->name, host->address, pistring,
5772 : string_sprintf("T:%S%s:%s", host->name, pistring, message_id);
5774 retry_add_item(addrlist, retry_message_key,
5775 rf_message | rf_host | delete_flag);
5776 update_waiting = FALSE;
5779 /* Any return other than DEFER (that is, OK or ERROR) means that the
5780 addresses have got their final statuses filled in for this host. In the OK
5781 case, see if any of them are deferred. */
5784 for (address_item * addr = addrlist; addr; addr = addr->next)
5785 if (addr->transport_return == DEFER)
5787 some_deferred = TRUE;
5791 /* If no addresses deferred or the result was ERROR, return. We do this for
5792 ERROR because a failing filter set-up or add_headers expansion is likely to
5793 fail for any host we try. */
5795 if (rc == ERROR || (rc == OK && !some_deferred))
5797 DEBUG(D_transport) debug_printf("Leaving %s transport\n", tblock->name);
5798 return TRUE; /* Each address has its status */
5801 /* If the result was DEFER or some individual addresses deferred, let
5802 the loop run to try other hosts with the deferred addresses, except for the
5803 case when we were trying to deliver down an existing channel and failed.
5804 Don't try any other hosts in this case. */
5806 if (continue_hostname) break;
5808 /* If the whole delivery, or some individual addresses, were deferred and
5809 there are more hosts that could be tried, do not count this host towards
5810 the hosts_max_try limit if the age of the message is greater than the
5811 maximum retry time for this host. This means we may try try all hosts,
5812 ignoring the limit, when messages have been around for some time. This is
5813 important because if we don't try all hosts, the address will never time
5814 out. NOTE: this does not apply to hosts_max_try_hardlimit. */
5816 if ((rc == DEFER || some_deferred) && nexthost)
5819 retry_config *retry = retry_find_config(host->name, NULL, 0, 0);
5821 if (retry && retry->rules)
5823 retry_rule *last_rule;
5824 for (last_rule = retry->rules;
5826 last_rule = last_rule->next);
5827 timedout = time(NULL) - received_time.tv_sec > last_rule->timeout;
5829 else timedout = TRUE; /* No rule => timed out */
5833 unexpired_hosts_tried--;
5834 DEBUG(D_transport) debug_printf("temporary delivery error(s) override "
5835 "hosts_max_try (message older than host's retry time)\n");
5841 if (unexpired_hosts_tried >= ob->hosts_max_try)
5842 debug_printf("reached transport hosts_max_try limit %d\n",
5844 if (total_hosts_tried >= ob->hosts_max_try_hardlimit)
5845 debug_printf("reached transport hosts_max_try_hardlimit limit %d\n",
5846 ob->hosts_max_try_hardlimit);
5849 testharness_pause_ms(500); /* let server debug out */
5850 } /* End of loop for trying multiple hosts. */
5852 /* If we failed to find a matching host in the list, for an already-open
5853 connection, just close it and start over with the list. This can happen
5854 for routing that changes from run to run, or big multi-IP sites with
5857 if (continue_hostname && !continue_host_tried)
5859 int fd = cutthrough.cctx.sock >= 0 ? cutthrough.cctx.sock : 0;
5861 DEBUG(D_transport) debug_printf("no hosts match already-open connection\n");
5863 /* A TLS conn could be open for a cutthrough, but not for a plain continued-
5865 /*XXX doublecheck that! */
5867 if (cutthrough.cctx.sock >= 0 && cutthrough.is_tls)
5869 (void) tls_write(cutthrough.cctx.tls_ctx, US"QUIT\r\n", 6, FALSE);
5870 tls_close(cutthrough.cctx.tls_ctx, TLS_SHUTDOWN_NOWAIT);
5871 cutthrough.cctx.tls_ctx = NULL;
5872 cutthrough.is_tls = FALSE;
5876 (void) write(fd, US"QUIT\r\n", 6);
5879 cutthrough.cctx.sock = -1;
5880 continue_hostname = NULL;
5881 goto retry_non_continued;
5884 /* This is the end of the loop that repeats iff expired is TRUE and
5885 ob->delay_after_cutoff is FALSE. The second time round we will
5886 try those hosts that haven't been tried since the message arrived. */
5890 debug_printf("all IP addresses skipped or deferred at least one address\n");
5891 if (expired && !ob->delay_after_cutoff && cutoff_retry == 0)
5892 debug_printf("retrying IP addresses not tried since message arrived\n");
5897 /* Get here if all IP addresses are skipped or defer at least one address. In
5898 MUA wrapper mode, this will happen only for connection or other non-message-
5899 specific failures. Force the delivery status for all addresses to FAIL. */
5903 for (address_item * addr = addrlist; addr; addr = addr->next)
5904 addr->transport_return = FAIL;
5908 /* In the normal, non-wrapper case, add a standard message to each deferred
5909 address if there hasn't been an error, that is, if it hasn't actually been
5910 tried this time. The variable "expired" will be FALSE if any deliveries were
5911 actually tried, or if there was at least one host that was not expired. That
5912 is, it is TRUE only if no deliveries were tried and all hosts were expired. If
5913 a delivery has been tried, an error code will be set, and the failing of the
5914 message is handled by the retry code later.
5916 If queue_smtp is set, or this transport was called to send a subsequent message
5917 down an existing TCP/IP connection, and something caused the host not to be
5918 found, we end up here, but can detect these cases and handle them specially. */
5920 for (address_item * addr = addrlist; addr; addr = addr->next)
5922 /* If host is not NULL, it means that we stopped processing the host list
5923 because of hosts_max_try or hosts_max_try_hardlimit. In the former case, this
5924 means we need to behave as if some hosts were skipped because their retry
5925 time had not come. Specifically, this prevents the address from timing out.
5926 However, if we have hit hosts_max_try_hardlimit, we want to behave as if all
5927 hosts were tried. */
5930 if (total_hosts_tried >= ob->hosts_max_try_hardlimit)
5933 debug_printf("hosts_max_try_hardlimit reached: behave as if all "
5934 "hosts were tried\n");
5939 debug_printf("hosts_max_try limit caused some hosts to be skipped\n");
5940 setflag(addr, af_retry_skipped);
5943 if (f.queue_smtp) /* no deliveries attempted */
5945 addr->transport_return = DEFER;
5946 addr->basic_errno = 0;
5947 addr->message = US"SMTP delivery explicitly queued";
5950 else if ( addr->transport_return == DEFER
5951 && (addr->basic_errno == ERRNO_UNKNOWNERROR || addr->basic_errno == 0)
5955 addr->basic_errno = ERRNO_HRETRY;
5956 if (continue_hostname)
5957 addr->message = US"no host found for existing SMTP connection";
5960 setflag(addr, af_pass_message); /* This is not a security risk */
5961 addr->message = string_sprintf(
5962 "all hosts%s have been failing for a long time %s",
5963 addr->domain ? string_sprintf(" for '%s'", addr->domain) : US"",
5964 ob->delay_after_cutoff
5965 ? US"(and retry time not reached)"
5966 : US"and were last tried after this message arrived");
5968 /* If we are already using fallback hosts, or there are no fallback hosts
5969 defined, convert the result to FAIL to cause a bounce. */
5971 if (addr->host_list == addr->fallback_hosts || !addr->fallback_hosts)
5972 addr->transport_return = FAIL;
5977 if (hosts_retry == hosts_total)
5978 s = "retry time not reached for any host%s";
5979 else if (hosts_fail == hosts_total)
5980 s = "all host address lookups%s failed permanently";
5981 else if (hosts_defer == hosts_total)
5982 s = "all host address lookups%s failed temporarily";
5983 else if (hosts_serial == hosts_total)
5984 s = "connection limit reached for all hosts%s";
5985 else if (hosts_fail+hosts_defer == hosts_total)
5986 s = "all host address lookups%s failed";
5988 s = "some host address lookups failed and retry time "
5989 "not reached for other hosts or connection limit reached%s";
5991 addr->message = string_sprintf(s,
5992 addr->domain ? string_sprintf(" for '%s'", addr->domain) : US"");
5997 /* Update the database which keeps information about which messages are waiting
5998 for which hosts to become available. For some message-specific errors, the
5999 update_waiting flag is turned off because we don't want follow-on deliveries in
6000 those cases. If this transport instance is explicitly limited to one message
6001 per connection then follow-on deliveries are not possible and there's no need
6002 to create/update the per-transport wait-<transport_name> database. */
6004 if (update_waiting && tblock->connection_max_messages != 1)
6005 transport_update_waiting(hostlist, tblock->name);
6009 DEBUG(D_transport) debug_printf("Leaving %s transport\n", tblock->name);
6011 return TRUE; /* Each address has its status */
6014 #endif /*!MACRO_PREDEF*/
6017 /* End of transport/smtp.c */