1 /*************************************************
2 * Exim - an Internet mail transport agent *
3 *************************************************/
5 /* Copyright (c) University of Cambridge 1995 - 2018 */
6 /* Copyright (c) The Exim Maintainers 2020 */
7 /* See the file NOTICE for conditions of use and distribution. */
12 #if defined(SUPPORT_DANE) && defined(DISABLE_TLS)
13 # error TLS is required for DANE
17 /* Options specific to the smtp transport. This transport also supports LMTP
18 over TCP/IP. The options must be in alphabetic order (note that "_" comes
19 before the lower case letters). Some live in the transport_instance block so as
20 to be publicly visible; these are flagged with opt_public. */
22 #define LOFF(field) OPT_OFF(smtp_transport_options_block, field)
24 optionlist smtp_transport_options[] = {
25 { "*expand_multi_domain", opt_stringptr | opt_hidden | opt_public,
26 OPT_OFF(transport_instance, expand_multi_domain) },
27 { "*expand_retry_include_ip_address", opt_stringptr | opt_hidden,
28 LOFF(expand_retry_include_ip_address) },
30 { "address_retry_include_sender", opt_bool,
31 LOFF(address_retry_include_sender) },
32 { "allow_localhost", opt_bool, LOFF(allow_localhost) },
33 #ifdef EXPERIMENTAL_ARC
34 { "arc_sign", opt_stringptr, LOFF(arc_sign) },
36 { "authenticated_sender", opt_stringptr, LOFF(authenticated_sender) },
37 { "authenticated_sender_force", opt_bool, LOFF(authenticated_sender_force) },
38 { "command_timeout", opt_time, LOFF(command_timeout) },
39 { "connect_timeout", opt_time, LOFF(connect_timeout) },
40 { "connection_max_messages", opt_int | opt_public,
41 OPT_OFF(transport_instance, connection_max_messages) },
43 { "dane_require_tls_ciphers", opt_stringptr, LOFF(dane_require_tls_ciphers) },
45 { "data_timeout", opt_time, LOFF(data_timeout) },
46 { "delay_after_cutoff", opt_bool, LOFF(delay_after_cutoff) },
48 { "dkim_canon", opt_stringptr, LOFF(dkim.dkim_canon) },
49 { "dkim_domain", opt_stringptr, LOFF(dkim.dkim_domain) },
50 { "dkim_hash", opt_stringptr, LOFF(dkim.dkim_hash) },
51 { "dkim_identity", opt_stringptr, LOFF(dkim.dkim_identity) },
52 { "dkim_private_key", opt_stringptr, LOFF(dkim.dkim_private_key) },
53 { "dkim_selector", opt_stringptr, LOFF(dkim.dkim_selector) },
54 { "dkim_sign_headers", opt_stringptr, LOFF(dkim.dkim_sign_headers) },
55 { "dkim_strict", opt_stringptr, LOFF(dkim.dkim_strict) },
56 { "dkim_timestamps", opt_stringptr, LOFF(dkim.dkim_timestamps) },
58 { "dns_qualify_single", opt_bool, LOFF(dns_qualify_single) },
59 { "dns_search_parents", opt_bool, LOFF(dns_search_parents) },
60 { "dnssec_request_domains", opt_stringptr, LOFF(dnssec.request) },
61 { "dnssec_require_domains", opt_stringptr, LOFF(dnssec.require) },
62 { "dscp", opt_stringptr, LOFF(dscp) },
63 { "fallback_hosts", opt_stringptr, LOFF(fallback_hosts) },
64 { "final_timeout", opt_time, LOFF(final_timeout) },
65 { "gethostbyname", opt_bool, LOFF(gethostbyname) },
66 { "helo_data", opt_stringptr, LOFF(helo_data) },
67 { "hosts", opt_stringptr, LOFF(hosts) },
68 { "hosts_avoid_esmtp", opt_stringptr, LOFF(hosts_avoid_esmtp) },
69 { "hosts_avoid_pipelining", opt_stringptr, LOFF(hosts_avoid_pipelining) },
71 { "hosts_avoid_tls", opt_stringptr, LOFF(hosts_avoid_tls) },
73 { "hosts_max_try", opt_int, LOFF(hosts_max_try) },
74 { "hosts_max_try_hardlimit", opt_int, LOFF(hosts_max_try_hardlimit) },
76 { "hosts_nopass_tls", opt_stringptr, LOFF(hosts_nopass_tls) },
77 { "hosts_noproxy_tls", opt_stringptr, LOFF(hosts_noproxy_tls) },
79 { "hosts_override", opt_bool, LOFF(hosts_override) },
80 #ifndef DISABLE_PIPE_CONNECT
81 { "hosts_pipe_connect", opt_stringptr, LOFF(hosts_pipe_connect) },
83 { "hosts_randomize", opt_bool, LOFF(hosts_randomize) },
84 #if !defined(DISABLE_TLS) && !defined(DISABLE_OCSP)
85 { "hosts_request_ocsp", opt_stringptr, LOFF(hosts_request_ocsp) },
87 { "hosts_require_auth", opt_stringptr, LOFF(hosts_require_auth) },
90 { "hosts_require_dane", opt_stringptr, LOFF(hosts_require_dane) },
93 { "hosts_require_ocsp", opt_stringptr, LOFF(hosts_require_ocsp) },
95 { "hosts_require_tls", opt_stringptr, LOFF(hosts_require_tls) },
97 { "hosts_try_auth", opt_stringptr, LOFF(hosts_try_auth) },
98 { "hosts_try_chunking", opt_stringptr, LOFF(hosts_try_chunking) },
100 { "hosts_try_dane", opt_stringptr, LOFF(hosts_try_dane) },
102 { "hosts_try_fastopen", opt_stringptr, LOFF(hosts_try_fastopen) },
104 { "hosts_try_prdr", opt_stringptr, LOFF(hosts_try_prdr) },
107 { "hosts_verify_avoid_tls", opt_stringptr, LOFF(hosts_verify_avoid_tls) },
109 { "interface", opt_stringptr, LOFF(interface) },
110 { "keepalive", opt_bool, LOFF(keepalive) },
111 { "lmtp_ignore_quota", opt_bool, LOFF(lmtp_ignore_quota) },
112 { "max_rcpt", opt_int | opt_public,
113 OPT_OFF(transport_instance, max_addresses) },
114 { "message_linelength_limit", opt_int, LOFF(message_linelength_limit) },
115 { "multi_domain", opt_expand_bool | opt_public,
116 OPT_OFF(transport_instance, multi_domain) },
117 { "port", opt_stringptr, LOFF(port) },
118 { "protocol", opt_stringptr, LOFF(protocol) },
119 { "retry_include_ip_address", opt_expand_bool, LOFF(retry_include_ip_address) },
120 { "serialize_hosts", opt_stringptr, LOFF(serialize_hosts) },
121 { "size_addition", opt_int, LOFF(size_addition) },
123 { "socks_proxy", opt_stringptr, LOFF(socks_proxy) },
126 { "tls_certificate", opt_stringptr, LOFF(tls_certificate) },
127 { "tls_crl", opt_stringptr, LOFF(tls_crl) },
128 { "tls_dh_min_bits", opt_int, LOFF(tls_dh_min_bits) },
129 { "tls_privatekey", opt_stringptr, LOFF(tls_privatekey) },
130 { "tls_require_ciphers", opt_stringptr, LOFF(tls_require_ciphers) },
131 # ifndef DISABLE_TLS_RESUME
132 { "tls_resumption_hosts", opt_stringptr, LOFF(tls_resumption_hosts) },
134 { "tls_sni", opt_stringptr, LOFF(tls_sni) },
135 { "tls_tempfail_tryclear", opt_bool, LOFF(tls_tempfail_tryclear) },
136 { "tls_try_verify_hosts", opt_stringptr, LOFF(tls_try_verify_hosts) },
137 { "tls_verify_cert_hostnames", opt_stringptr, LOFF(tls_verify_cert_hostnames)},
138 { "tls_verify_certificates", opt_stringptr, LOFF(tls_verify_certificates) },
139 { "tls_verify_hosts", opt_stringptr, LOFF(tls_verify_hosts) },
142 { "utf8_downconvert", opt_stringptr, LOFF(utf8_downconvert) },
146 /* Size of the options list. An extern variable has to be used so that its
147 address can appear in the tables drtables.c. */
149 int smtp_transport_options_count = nelem(smtp_transport_options);
155 smtp_transport_options_block smtp_transport_option_defaults = {0};
156 void smtp_transport_init(transport_instance *tblock) {}
157 BOOL smtp_transport_entry(transport_instance *tblock, address_item *addr) {return FALSE;}
158 void smtp_transport_closedown(transport_instance *tblock) {}
160 #else /*!MACRO_PREDEF*/
163 /* Default private options block for the smtp transport. */
165 smtp_transport_options_block smtp_transport_option_defaults = {
166 /* All non-mentioned elements 0/NULL/FALSE */
167 .helo_data = US"$primary_hostname",
168 .protocol = US"smtp",
169 .hosts_try_chunking = US"*",
171 .hosts_try_dane = US"*",
173 .hosts_try_fastopen = US"*",
175 .hosts_try_prdr = US"*",
178 .hosts_request_ocsp = US"*", /* hosts_request_ocsp (except under DANE; tls_client_start()) */
180 .command_timeout = 5*60,
181 .connect_timeout = 5*60,
182 .data_timeout = 5*60,
183 .final_timeout = 10*60,
184 .size_addition = 1024,
186 .hosts_max_try_hardlimit = 50,
187 .message_linelength_limit = 998,
188 .address_retry_include_sender = TRUE,
189 .dns_qualify_single = TRUE,
190 .dnssec = { .request= US"*", .require=NULL },
191 .delay_after_cutoff = TRUE,
193 .retry_include_ip_address = TRUE,
195 # if defined(SUPPORT_SYSDEFAULT_CABUNDLE) || !defined(USE_GNUTLS)
196 .tls_verify_certificates = US"system",
198 .tls_dh_min_bits = EXIM_CLIENT_DH_DEFAULT_MIN_BITS,
199 .tls_tempfail_tryclear = TRUE,
200 .tls_try_verify_hosts = US"*",
201 .tls_verify_cert_hostnames = US"*",
204 .utf8_downconvert = US"-1",
208 { .dkim_hash = US"sha256", },
212 /* some DSN flags for use later */
214 static int rf_list[] = {rf_notify_never, rf_notify_success,
215 rf_notify_failure, rf_notify_delay };
217 static uschar *rf_names[] = { US"NEVER", US"SUCCESS", US"FAILURE", US"DELAY" };
223 static uschar *smtp_command; /* Points to last cmd for error messages */
224 static uschar *mail_command; /* Points to MAIL cmd for error messages */
225 static uschar *data_command = US""; /* Points to DATA cmd for error messages */
226 static BOOL update_waiting; /* TRUE to update the "wait" database */
228 /*XXX move to smtp_context */
229 static BOOL pipelining_active; /* current transaction is in pipe mode */
232 static unsigned ehlo_response(uschar * buf, unsigned checks);
235 /******************************************************************************/
238 smtp_deliver_init(void)
240 if (!regex_PIPELINING) regex_PIPELINING =
241 regex_must_compile(US"\\n250[\\s\\-]PIPELINING(\\s|\\n|$)", 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;
359 /* Retry_use_local_part defaults FALSE if unset */
361 if (tblock->retry_use_local_part == TRUE_UNSET)
362 tblock->retry_use_local_part = FALSE;
364 /* Set the default port according to the protocol */
367 ob->port = strcmpic(ob->protocol, US"lmtp") == 0
369 : strcmpic(ob->protocol, US"smtps") == 0
370 ? US"smtps" : US"smtp";
372 /* Set up the setup entry point, to be called before subprocesses for this
375 tblock->setup = smtp_transport_setup;
377 /* Complain if any of the timeouts are zero. */
379 if (ob->command_timeout <= 0 || ob->data_timeout <= 0 ||
380 ob->final_timeout <= 0)
381 log_write(0, LOG_PANIC_DIE|LOG_CONFIG,
382 "command, data, or final timeout value is zero for %s transport",
385 /* If hosts_override is set and there are local hosts, set the global
386 flag that stops verify from showing router hosts. */
388 if (ob->hosts_override && ob->hosts) tblock->overrides_hosts = TRUE;
390 /* If there are any fallback hosts listed, build a chain of host items
391 for them, but do not do any lookups at this time. */
393 host_build_hostlist(&(ob->fallback_hostlist), ob->fallback_hosts, FALSE);
400 /*************************************************
401 * Set delivery info into all active addresses *
402 *************************************************/
404 /* Only addresses whose status is >= PENDING are relevant. A lesser
405 status means that an address is not currently being processed.
408 addrlist points to a chain of addresses
409 errno_value to put in each address's errno field
410 msg to put in each address's message field
411 rc to put in each address's transport_return field
412 pass_message if TRUE, set the "pass message" flag in the address
413 host if set, mark addrs as having used this host
414 smtp_greeting from peer
415 helo_response from peer
416 start points to timestamp of delivery start
418 If errno_value has the special value ERRNO_CONNECTTIMEOUT, ETIMEDOUT is put in
419 the errno field, and RTEF_CTOUT is ORed into the more_errno field, to indicate
420 this particular type of timeout.
426 set_errno(address_item *addrlist, int errno_value, uschar *msg, int rc,
427 BOOL pass_message, host_item * host,
428 #ifdef EXPERIMENTAL_DSN_INFO
429 const uschar * smtp_greeting, const uschar * helo_response,
431 struct timeval * start
435 struct timeval deliver_time;
437 if (errno_value == ERRNO_CONNECTTIMEOUT)
439 errno_value = ETIMEDOUT;
440 orvalue = RTEF_CTOUT;
442 timesince(&deliver_time, start);
444 for (address_item * addr = addrlist; addr; addr = addr->next)
445 if (addr->transport_return >= PENDING)
447 addr->basic_errno = errno_value;
448 addr->more_errno |= orvalue;
449 addr->delivery_time = deliver_time;
453 if (pass_message) setflag(addr, af_pass_message);
455 addr->transport_return = rc;
458 addr->host_used = host;
459 #ifdef EXPERIMENTAL_DSN_INFO
461 {uschar * s = Ustrchr(smtp_greeting, '\n'); if (s) *s = '\0';}
462 addr->smtp_greeting = smtp_greeting;
465 {uschar * s = Ustrchr(helo_response, '\n'); if (s) *s = '\0';}
466 addr->helo_response = helo_response;
473 set_errno_nohost(address_item * addrlist, int errno_value, uschar * msg, int rc,
474 BOOL pass_message, struct timeval * start)
476 set_errno(addrlist, errno_value, msg, rc, pass_message, NULL,
477 #ifdef EXPERIMENTAL_DSN_INFO
484 /*************************************************
485 * Check an SMTP response *
486 *************************************************/
488 /* This function is given an errno code and the SMTP response buffer
489 to analyse, together with the host identification for generating messages. It
490 sets an appropriate message and puts the first digit of the response code into
491 the yield variable. If no response was actually read, a suitable digit is
495 host the current host, to get its name for messages
496 errno_value pointer to the errno value
497 more_errno from the top address for use with ERRNO_FILTER_FAIL
498 buffer the SMTP response buffer
499 yield where to put a one-digit SMTP response code
500 message where to put an error message
501 pass_message set TRUE if message is an SMTP response
503 Returns: TRUE if an SMTP "QUIT" command should be sent, else FALSE
507 check_response(host_item *host, int *errno_value, int more_errno,
508 uschar *buffer, int *yield, uschar **message, BOOL *pass_message)
510 uschar * pl = pipelining_active ? US"pipelined " : US"";
513 *yield = '4'; /* Default setting is to give a temporary error */
517 case ETIMEDOUT: /* Handle response timeout */
518 *message = US string_sprintf("SMTP timeout after %s%s",
520 if (transport_count > 0)
521 *message = US string_sprintf("%s (%d bytes written)", *message,
525 case ERRNO_SMTPFORMAT: /* Handle malformed SMTP response */
526 s = string_printing(buffer);
527 while (isspace(*s)) s++;
529 ? string_sprintf("Malformed SMTP reply (an empty line) "
530 "in response to %s%s", pl, smtp_command)
531 : string_sprintf("Malformed SMTP reply in response to %s%s: %s",
532 pl, smtp_command, s);
535 case ERRNO_TLSFAILURE: /* Handle bad first read; can happen with
537 *message = US"bad first read from TLS conn";
540 case ERRNO_FILTER_FAIL: /* Handle a failed filter process error;
541 can't send QUIT as we mustn't end the DATA. */
542 *message = string_sprintf("transport filter process failed (%d)%s",
544 more_errno == EX_EXECFAILED ? ": unable to execute command" : "");
547 case ERRNO_CHHEADER_FAIL: /* Handle a failed add_headers expansion;
548 can't send QUIT as we mustn't end the DATA. */
550 string_sprintf("failed to expand headers_add or headers_remove: %s",
551 expand_string_message);
554 case ERRNO_WRITEINCOMPLETE: /* failure to write a complete data block */
555 *message = US"failed to write a data block";
559 case ERRNO_UTF8_FWD: /* no advertised SMTPUTF8, for international message */
560 *message = US"utf8 support required but not offered for forwarding";
561 DEBUG(D_deliver|D_transport) debug_printf("%s\n", *message);
566 /* Handle error responses from the remote mailer. */
570 *message = string_sprintf("SMTP error from remote mail server after %s%s: "
571 "%s", pl, smtp_command, s = string_printing(buffer));
572 *pass_message = TRUE;
577 /* No data was read. If there is no errno, this must be the EOF (i.e.
578 connection closed) case, which causes deferral. An explicit connection reset
579 error has the same effect. Otherwise, put the host's identity in the message,
580 leaving the errno value to be interpreted as well. In all cases, we have to
581 assume the connection is now dead. */
583 if (*errno_value == 0 || *errno_value == ECONNRESET)
585 *errno_value = ERRNO_SMTPCLOSED;
586 *message = US string_sprintf("Remote host closed connection "
587 "in response to %s%s", pl, smtp_command);
590 *message = US string_sprintf("%s [%s]", host->name, host->address);
597 /*************************************************
598 * Write error message to logs *
599 *************************************************/
601 /* This writes to the main log and to the message log.
604 host the current host
605 detail the current message (addr_item->message)
606 basic_errno the errno (addr_item->basic_errno)
612 write_logs(const host_item *host, const uschar *suffix, int basic_errno)
614 gstring * message = LOGGING(outgoing_port)
615 ? string_fmt_append(NULL, "H=%s [%s]:%d", host->name, host->address,
616 host->port == PORT_NONE ? 25 : host->port)
617 : string_fmt_append(NULL, "H=%s [%s]", host->name, host->address);
621 message = string_fmt_append(message, ": %s", suffix);
623 message = string_fmt_append(message, ": %s", strerror(basic_errno));
626 message = string_fmt_append(message, " %s", exim_errstr(basic_errno));
628 log_write(0, LOG_MAIN, "%s", string_from_gstring(message));
629 deliver_msglog("%s %s\n", tod_stamp(tod_log), message->s);
633 msglog_line(host_item * host, uschar * message)
635 deliver_msglog("%s H=%s [%s] %s\n", tod_stamp(tod_log),
636 host->name, host->address, message);
641 #ifndef DISABLE_EVENT
642 /*************************************************
643 * Post-defer action *
644 *************************************************/
646 /* This expands an arbitrary per-transport string.
647 It might, for example, be used to write to the database log.
650 addr the address item containing error information
651 host the current host
658 deferred_event_raise(address_item * addr, host_item * host, uschar * evstr)
660 uschar * action = addr->transport->event_action;
661 const uschar * save_domain;
667 save_domain = deliver_domain;
668 save_local = deliver_localpart;
670 /*XXX would ip & port already be set up? */
671 deliver_host_address = string_copy(host->address);
672 deliver_host_port = host->port == PORT_NONE ? 25 : host->port;
673 event_defer_errno = addr->basic_errno;
675 router_name = addr->router->name;
676 transport_name = addr->transport->name;
677 deliver_domain = addr->domain;
678 deliver_localpart = addr->local_part;
680 (void) event_raise(action, evstr,
682 ? addr->basic_errno > 0
683 ? string_sprintf("%s: %s", addr->message, strerror(addr->basic_errno))
684 : string_copy(addr->message)
685 : addr->basic_errno > 0
686 ? string_copy(US strerror(addr->basic_errno))
689 deliver_localpart = save_local;
690 deliver_domain = save_domain;
691 router_name = transport_name = NULL;
695 /*************************************************
696 * Reap SMTP specific responses *
697 *************************************************/
699 smtp_discard_responses(smtp_context * sx, smtp_transport_options_block * ob,
702 uschar flushbuffer[4096];
706 if (!smtp_read_response(sx, flushbuffer, sizeof(flushbuffer),
707 '2', ob->command_timeout)
708 && (errno != 0 || flushbuffer[0] == 0))
715 /* Return boolean success */
718 smtp_reap_banner(smtp_context * sx)
721 #if defined(__linux__) && defined(TCP_QUICKACK)
722 { /* Hack to get QUICKACK disabled; has to be right after 3whs, and has to on->off */
723 int sock = sx->cctx.sock;
724 struct pollfd p = {.fd = sock, .events = POLLOUT};
725 int rc = poll(&p, 1, 1000);
726 (void) setsockopt(sock, IPPROTO_TCP, TCP_QUICKACK, US &on, sizeof(on));
727 (void) setsockopt(sock, IPPROTO_TCP, TCP_QUICKACK, US &off, sizeof(off));
730 good_response = smtp_read_response(sx, sx->buffer, sizeof(sx->buffer),
731 '2', (SOB sx->conn_args.ob)->command_timeout);
732 #ifdef EXPERIMENTAL_DSN_INFO
733 sx->smtp_greeting = string_copy(sx->buffer);
735 return good_response;
739 smtp_reap_ehlo(smtp_context * sx)
741 if (!smtp_read_response(sx, sx->buffer, sizeof(sx->buffer), '2',
742 (SOB sx->conn_args.ob)->command_timeout))
744 if (errno != 0 || sx->buffer[0] == 0 || sx->lmtp)
746 #ifdef EXPERIMENTAL_DSN_INFO
747 sx->helo_response = string_copy(sx->buffer);
753 #ifdef EXPERIMENTAL_DSN_INFO
754 sx->helo_response = string_copy(sx->buffer);
756 #ifndef DISABLE_EVENT
757 (void) event_raise(sx->conn_args.tblock->event_action,
758 US"smtp:ehlo", sx->buffer);
764 /******************************************************************************/
766 #ifdef EXPERIMENTAL_ESMTP_LIMITS
767 /* If TLS, or TLS not offered, called with the EHLO response in the buffer.
768 Check it for a LIMITS keyword and parse values into the smtp context structure.
770 We don't bother with peers that we won't talk TLS to, even though they can,
771 just ignore their LIMITS advice (if any) and treat them as if they do not.
772 This saves us dealing with a duplicate set of values. */
775 ehlo_response_limits_read(smtp_context * sx)
777 int ovec[3]; /* results vector for a main-match only */
779 /* matches up to just after the first space after the keyword */
781 if (pcre_exec(regex_LIMITS, NULL, CS sx->buffer, Ustrlen(sx->buffer),
782 0, PCRE_EOPT, ovec, nelem(ovec)) >= 0)
783 for (const uschar * s = sx->buffer + ovec[1]; *s; )
785 while (isspace(*s)) s++;
786 if (*s == '\n') break;
788 if (strncmpic(s, US"MAILMAX=", 8) == 0)
790 sx->peer_limit_mail = atoi(CS (s += 8));
791 while (isdigit(*s)) s++;
793 else if (strncmpic(s, US"RCPTMAX=", 8) == 0)
795 sx->peer_limit_rcpt = atoi(CS (s += 8));
796 while (isdigit(*s)) s++;
798 else if (strncmpic(s, US"RCPTDOMAINMAX=", 14) == 0)
800 sx->peer_limit_rcptdom = atoi(CS (s += 14));
801 while (isdigit(*s)) s++;
804 while (*s && !isspace(*s)) s++;
808 /* Apply given values to the current connection */
810 ehlo_limits_apply(smtp_context * sx,
811 unsigned limit_mail, unsigned limit_rcpt, unsigned limit_rcptdom)
813 if (limit_mail && limit_mail < sx->max_mail) sx->max_mail = limit_mail;
814 if (limit_rcpt && limit_rcpt < sx->max_rcpt) sx->max_rcpt = limit_rcpt;
817 DEBUG(D_transport) debug_printf("will treat as !multi_domain\n");
818 sx->single_rcpt_domain = TRUE;
822 /* Apply values from EHLO-resp to the current connection */
824 ehlo_response_limits_apply(smtp_context * sx)
826 ehlo_limits_apply(sx, sx->peer_limit_mail, sx->peer_limit_rcpt,
827 sx->peer_limit_rcptdom);
830 /* Apply values read from cache to the current connection */
832 ehlo_cache_limits_apply(smtp_context * sx)
834 ehlo_limits_apply(sx, sx->ehlo_resp.limit_mail, sx->ehlo_resp.limit_rcpt,
835 sx->ehlo_resp.limit_rcptdom);
839 /******************************************************************************/
841 #ifndef DISABLE_PIPE_CONNECT
843 ehlo_cache_key(const smtp_context * sx)
845 host_item * host = sx->conn_args.host;
846 return Ustrchr(host->address, ':')
847 ? string_sprintf("[%s]:%d.EHLO", host->address,
848 host->port == PORT_NONE ? sx->port : host->port)
849 : string_sprintf("%s:%d.EHLO", host->address,
850 host->port == PORT_NONE ? sx->port : host->port);
853 /* Cache EHLO-response info for use by early-pipe.
855 - During a normal flow on EHLO response (either cleartext or under TLS),
856 when we are willing to do PIPE_CONNECT and it is offered
857 - During an early-pipe flow on receiving the actual EHLO response and noting
858 disparity versus the cached info used, when PIPE_CONNECT is still being offered
860 We assume that suitable values have been set in the sx.ehlo_resp structure for
861 features and auths; we handle the copy of limits. */
864 write_ehlo_cache_entry(smtp_context * sx)
866 open_db dbblock, * dbm_file;
868 #ifdef EXPERIMENTAL_ESMTP_LIMITS
869 sx->ehlo_resp.limit_mail = sx->peer_limit_mail;
870 sx->ehlo_resp.limit_rcpt = sx->peer_limit_rcpt;
871 sx->ehlo_resp.limit_rcptdom = sx->peer_limit_rcptdom;
874 if ((dbm_file = dbfn_open(US"misc", O_RDWR, &dbblock, TRUE, TRUE)))
876 uschar * ehlo_resp_key = ehlo_cache_key(sx);
877 dbdata_ehlo_resp er = { .data = sx->ehlo_resp };
880 #ifdef EXPERIMENTAL_ESMTP_LIMITS
881 if (sx->ehlo_resp.limit_mail || sx->ehlo_resp.limit_rcpt || sx->ehlo_resp.limit_rcptdom)
882 debug_printf("writing clr %04x/%04x cry %04x/%04x lim %05d/%05d/%05d\n",
883 sx->ehlo_resp.cleartext_features, sx->ehlo_resp.cleartext_auths,
884 sx->ehlo_resp.crypted_features, sx->ehlo_resp.crypted_auths,
885 sx->ehlo_resp.limit_mail, sx->ehlo_resp.limit_rcpt,
886 sx->ehlo_resp.limit_rcptdom);
889 debug_printf("writing clr %04x/%04x cry %04x/%04x\n",
890 sx->ehlo_resp.cleartext_features, sx->ehlo_resp.cleartext_auths,
891 sx->ehlo_resp.crypted_features, sx->ehlo_resp.crypted_auths);
893 dbfn_write(dbm_file, ehlo_resp_key, &er, (int)sizeof(er));
894 dbfn_close(dbm_file);
899 invalidate_ehlo_cache_entry(smtp_context * sx)
901 open_db dbblock, * dbm_file;
903 if ( sx->early_pipe_active
904 && (dbm_file = dbfn_open(US"misc", O_RDWR, &dbblock, TRUE, TRUE)))
906 uschar * ehlo_resp_key = ehlo_cache_key(sx);
907 dbfn_delete(dbm_file, ehlo_resp_key);
908 dbfn_close(dbm_file);
913 read_ehlo_cache_entry(smtp_context * sx)
918 if (!(dbm_file = dbfn_open(US"misc", O_RDONLY, &dbblock, FALSE, TRUE)))
919 { DEBUG(D_transport) debug_printf("ehlo-cache: no misc DB\n"); }
922 uschar * ehlo_resp_key = ehlo_cache_key(sx);
923 dbdata_ehlo_resp * er;
925 if (!(er = dbfn_read_enforce_length(dbm_file, ehlo_resp_key, sizeof(dbdata_ehlo_resp))))
926 { DEBUG(D_transport) debug_printf("no ehlo-resp record\n"); }
927 else if (time(NULL) - er->time_stamp > retry_data_expire)
929 DEBUG(D_transport) debug_printf("ehlo-resp record too old\n");
930 dbfn_close(dbm_file);
931 if ((dbm_file = dbfn_open(US"misc", O_RDWR, &dbblock, TRUE, TRUE)))
932 dbfn_delete(dbm_file, ehlo_resp_key);
937 #ifdef EXPERIMENTAL_ESMTP_LIMITS
938 if (er->data.limit_mail || er->data.limit_rcpt || er->data.limit_rcptdom)
939 debug_printf("EHLO response bits from cache:"
940 " cleartext 0x%04x/0x%04x crypted 0x%04x/0x%04x lim %05d/%05d/%05d\n",
941 er->data.cleartext_features, er->data.cleartext_auths,
942 er->data.crypted_features, er->data.crypted_auths,
943 er->data.limit_mail, er->data.limit_rcpt, er->data.limit_rcptdom);
946 debug_printf("EHLO response bits from cache:"
947 " cleartext 0x%04x/0x%04x crypted 0x%04x/0x%04x\n",
948 er->data.cleartext_features, er->data.cleartext_auths,
949 er->data.crypted_features, er->data.crypted_auths);
951 sx->ehlo_resp = er->data;
952 #ifdef EXPERIMENTAL_ESMTP_LIMITS
953 ehlo_cache_limits_apply(sx);
955 dbfn_close(dbm_file);
958 dbfn_close(dbm_file);
965 /* Return an auths bitmap for the set of AUTH methods offered by the server
966 which match our authenticators. */
968 static unsigned short
969 study_ehlo_auths(smtp_context * sx)
974 unsigned short authbits = 0;
976 if (!sx->esmtp) return 0;
977 if (!regex_AUTH) regex_AUTH = regex_must_compile(AUTHS_REGEX, FALSE, TRUE);
978 if (!regex_match_and_setup(regex_AUTH, sx->buffer, 0, -1)) return 0;
979 expand_nmax = -1; /* reset */
980 names = string_copyn(expand_nstring[1], expand_nlength[1]);
982 for (au = auths, authnum = 0; au; au = au->next, authnum++) if (au->client)
984 const uschar * list = names;
986 for (int sep = ' '; s = string_nextinlist(&list, &sep, NULL, 0); )
987 if (strcmpic(au->public_name, s) == 0)
988 { authbits |= BIT(authnum); break; }
992 debug_printf("server offers %s AUTH, methods '%s', bitmap 0x%04x\n",
993 tls_out.active.sock >= 0 ? "crypted" : "plaintext", names, authbits);
995 if (tls_out.active.sock >= 0)
996 sx->ehlo_resp.crypted_auths = authbits;
998 sx->ehlo_resp.cleartext_auths = authbits;
1005 /* Wait for and check responses for early-pipelining.
1007 Called from the lower-level smtp_read_response() function
1008 used for general code that assume synchronisation, if context
1009 flags indicate outstanding early-pipelining commands. Also
1010 called fom sync_responses() which handles pipelined commands.
1013 sx smtp connection context
1014 countp number of outstanding responses, adjusted on return
1018 DEFER error on first read of TLS'd conn
1019 FAIL SMTP error in response
1022 smtp_reap_early_pipe(smtp_context * sx, int * countp)
1024 BOOL pending_BANNER = sx->pending_BANNER;
1025 BOOL pending_EHLO = sx->pending_EHLO;
1028 sx->pending_BANNER = FALSE; /* clear early to avoid recursion */
1029 sx->pending_EHLO = FALSE;
1033 DEBUG(D_transport) debug_printf("%s expect banner\n", __FUNCTION__);
1035 if (!smtp_reap_banner(sx))
1037 DEBUG(D_transport) debug_printf("bad banner\n");
1038 if (tls_out.active.sock >= 0) rc = DEFER;
1045 unsigned peer_offered;
1046 unsigned short authbits = 0, * ap;
1048 DEBUG(D_transport) debug_printf("%s expect ehlo\n", __FUNCTION__);
1050 if (!smtp_reap_ehlo(sx))
1052 DEBUG(D_transport) debug_printf("bad response for EHLO\n");
1053 if (tls_out.active.sock >= 0) rc = DEFER;
1057 /* Compare the actual EHLO response extensions and AUTH methods to the cached
1058 value we assumed; on difference, dump or rewrite the cache and arrange for a
1061 ap = tls_out.active.sock < 0
1062 ? &sx->ehlo_resp.cleartext_auths : &sx->ehlo_resp.crypted_auths;
1064 peer_offered = ehlo_response(sx->buffer,
1065 (tls_out.active.sock < 0 ? OPTION_TLS : 0)
1066 | OPTION_CHUNKING | OPTION_PRDR | OPTION_DSN | OPTION_PIPE | OPTION_SIZE
1067 | OPTION_UTF8 | OPTION_EARLY_PIPE
1069 #ifdef EXPERIMENTAL_ESMTP_LIMITS
1070 if (tls_out.active.sock >= 0 || !(peer_offered & OPTION_TLS))
1071 ehlo_response_limits_read(sx);
1073 if ( peer_offered != sx->peer_offered
1074 || (authbits = study_ehlo_auths(sx)) != *ap)
1077 debug_printf("EHLO %s extensions changed, 0x%04x/0x%04x -> 0x%04x/0x%04x\n",
1078 tls_out.active.sock < 0 ? "cleartext" : "crypted",
1079 sx->peer_offered, *ap, peer_offered, authbits);
1080 if (peer_offered & OPTION_EARLY_PIPE)
1082 *(tls_out.active.sock < 0
1083 ? &sx->ehlo_resp.cleartext_features : &sx->ehlo_resp.crypted_features) =
1086 write_ehlo_cache_entry(sx);
1089 invalidate_ehlo_cache_entry(sx);
1091 return OK; /* just carry on */
1093 #ifdef EXPERIMENTAL_ESMTP_LIMITS
1094 /* If we are handling LIMITS, compare the actual EHLO LIMITS values with the
1095 cached values and invalidate cache if different. OK to carry on with
1096 connect since values are advisory. */
1098 if ( (tls_out.active.sock >= 0 || !(peer_offered & OPTION_TLS))
1099 && ( sx->peer_limit_mail != sx->ehlo_resp.limit_mail
1100 || sx->peer_limit_rcpt != sx->ehlo_resp.limit_rcpt
1101 || sx->peer_limit_rcptdom != sx->ehlo_resp.limit_rcptdom
1106 debug_printf("EHLO LIMITS changed:");
1107 if (sx->peer_limit_mail != sx->ehlo_resp.limit_mail)
1108 debug_printf(" MAILMAX %u -> %u\n", sx->ehlo_resp.limit_mail, sx->peer_limit_mail);
1109 else if (sx->peer_limit_rcpt != sx->ehlo_resp.limit_rcpt)
1110 debug_printf(" RCPTMAX %u -> %u\n", sx->ehlo_resp.limit_rcpt, sx->peer_limit_rcpt);
1112 debug_printf(" RCPTDOMAINMAX %u -> %u\n", sx->ehlo_resp.limit_rcptdom, sx->peer_limit_rcptdom);
1114 invalidate_ehlo_cache_entry(sx);
1122 invalidate_ehlo_cache_entry(sx);
1123 (void) smtp_discard_responses(sx, sx->conn_args.ob, *countp);
1126 #endif /*!DISABLE_PIPE_CONNECT*/
1129 /*************************************************
1130 * Synchronize SMTP responses *
1131 *************************************************/
1133 /* This function is called from smtp_deliver() to receive SMTP responses from
1134 the server, and match them up with the commands to which they relate. When
1135 PIPELINING is not in use, this function is called after every command, and is
1136 therefore somewhat over-engineered, but it is simpler to use a single scheme
1137 that works both with and without PIPELINING instead of having two separate sets
1140 The set of commands that are buffered up with pipelining may start with MAIL
1141 and may end with DATA; in between are RCPT commands that correspond to the
1142 addresses whose status is PENDING_DEFER. All other commands (STARTTLS, AUTH,
1143 etc.) are never buffered.
1145 Errors after MAIL or DATA abort the whole process leaving the response in the
1146 buffer. After MAIL, pending responses are flushed, and the original command is
1147 re-instated in big_buffer for error messages. For RCPT commands, the remote is
1148 permitted to reject some recipient addresses while accepting others. However
1149 certain errors clearly abort the whole process. Set the value in
1150 transport_return to PENDING_OK if the address is accepted. If there is a
1151 subsequent general error, it will get reset accordingly. If not, it will get
1152 converted to OK at the end.
1155 sx smtp connection context
1156 count the number of responses to read
1157 pending_DATA 0 if last command sent was not DATA
1158 +1 if previously had a good recipient
1159 -1 if not previously had a good recipient
1161 Returns: 3 if at least one address had 2xx and one had 5xx
1162 2 if at least one address had 5xx but none had 2xx
1163 1 if at least one host had a 2xx response, but none had 5xx
1164 0 no address had 2xx or 5xx but no errors (all 4xx, or just DATA)
1165 -1 timeout while reading RCPT response
1166 -2 I/O or other non-response error for RCPT
1167 -3 DATA or MAIL failed - errno and buffer set
1168 -4 banner or EHLO failed (early-pipelining)
1169 -5 banner or EHLO failed (early-pipelining, TLS)
1173 sync_responses(smtp_context * sx, int count, int pending_DATA)
1175 address_item * addr = sx->sync_addr;
1176 smtp_transport_options_block * ob = sx->conn_args.ob;
1179 #ifndef DISABLE_PIPE_CONNECT
1181 if ((rc = smtp_reap_early_pipe(sx, &count)) != OK)
1182 return rc == FAIL ? -4 : -5;
1185 /* Handle the response for a MAIL command. On error, reinstate the original
1186 command in big_buffer for error message use, and flush any further pending
1187 responses before returning, except after I/O errors and timeouts. */
1189 if (sx->pending_MAIL)
1191 DEBUG(D_transport) debug_printf("%s expect mail\n", __FUNCTION__);
1193 sx->pending_MAIL = sx->RCPT_452 = FALSE;
1194 if (!smtp_read_response(sx, sx->buffer, sizeof(sx->buffer),
1195 '2', ob->command_timeout))
1197 DEBUG(D_transport) debug_printf("bad response for MAIL\n");
1198 Ustrcpy(big_buffer, mail_command); /* Fits, because it came from there! */
1199 if (errno == ERRNO_TLSFAILURE)
1201 if (errno == 0 && sx->buffer[0] != 0)
1204 if (sx->buffer[0] == '4')
1206 save_errno = ERRNO_MAIL4XX;
1207 addr->more_errno |= ((sx->buffer[1] - '0')*10 + sx->buffer[2] - '0') << 8;
1209 count = smtp_discard_responses(sx, ob, count);
1213 if (pending_DATA) count--; /* Number of RCPT responses to come */
1214 while (count-- > 0) /* Mark any pending addrs with the host used */
1216 while (addr->transport_return != PENDING_DEFER) addr = addr->next;
1217 addr->host_used = sx->conn_args.host;
1224 if (pending_DATA) count--; /* Number of RCPT responses to come */
1226 /* Read and handle the required number of RCPT responses, matching each one up
1227 with an address by scanning for the next address whose status is PENDING_DEFER.
1232 while (addr->transport_return != PENDING_DEFER)
1233 if (!(addr = addr->next))
1236 /* The address was accepted */
1237 addr->host_used = sx->conn_args.host;
1239 DEBUG(D_transport) debug_printf("%s expect rcpt for %s\n", __FUNCTION__, addr->address);
1240 if (smtp_read_response(sx, sx->buffer, sizeof(sx->buffer),
1241 '2', ob->command_timeout))
1244 addr->transport_return = PENDING_OK;
1246 /* If af_dr_retry_exists is set, there was a routing delay on this address;
1247 ensure that any address-specific retry record is expunged. We do this both
1248 for the basic key and for the version that also includes the sender. */
1250 if (testflag(addr, af_dr_retry_exists))
1252 uschar *altkey = string_sprintf("%s:<%s>", addr->address_retry_key,
1254 retry_add_item(addr, altkey, rf_delete);
1255 retry_add_item(addr, addr->address_retry_key, rf_delete);
1259 /* Error on first TLS read */
1261 else if (errno == ERRNO_TLSFAILURE)
1264 /* Timeout while reading the response */
1266 else if (errno == ETIMEDOUT)
1268 uschar *message = string_sprintf("SMTP timeout after RCPT TO:<%s>",
1269 transport_rcpt_address(addr, sx->conn_args.tblock->rcpt_include_affixes));
1270 set_errno_nohost(sx->first_addr, ETIMEDOUT, message, DEFER, FALSE, &sx->delivery_start);
1271 retry_add_item(addr, addr->address_retry_key, 0);
1272 update_waiting = FALSE;
1276 /* Handle other errors in obtaining an SMTP response by returning -1. This
1277 will cause all the addresses to be deferred. Restore the SMTP command in
1278 big_buffer for which we are checking the response, so the error message
1281 else if (errno != 0 || sx->buffer[0] == 0)
1283 gstring gs = { .size = big_buffer_size, .ptr = 0, .s = big_buffer }, * g = &gs;
1285 /* Use taint-unchecked routines for writing into big_buffer, trusting
1286 that we'll never expand it. */
1288 g = string_fmt_append_f(g, SVFMT_TAINT_NOCHK, "RCPT TO:<%s>",
1289 transport_rcpt_address(addr, sx->conn_args.tblock->rcpt_include_affixes));
1290 string_from_gstring(g);
1294 /* Handle SMTP permanent and temporary response codes. */
1299 string_sprintf("SMTP error from remote mail server after RCPT TO:<%s>: "
1300 "%s", transport_rcpt_address(addr, sx->conn_args.tblock->rcpt_include_affixes),
1301 string_printing(sx->buffer));
1302 setflag(addr, af_pass_message);
1304 msglog_line(sx->conn_args.host, addr->message);
1306 /* The response was 5xx */
1308 if (sx->buffer[0] == '5')
1310 addr->transport_return = FAIL;
1314 /* The response was 4xx */
1318 addr->transport_return = DEFER;
1319 addr->basic_errno = ERRNO_RCPT4XX;
1320 addr->more_errno |= ((sx->buffer[1] - '0')*10 + sx->buffer[2] - '0') << 8;
1324 #ifndef DISABLE_EVENT
1325 event_defer_errno = addr->more_errno;
1326 msg_event_raise(US"msg:rcpt:host:defer", addr);
1328 /* If a 452 and we've had at least one 2xx or 5xx, set next_addr to the
1329 start point for another MAIL command. */
1331 if (addr->more_errno >> 8 == 52 && yield & 3)
1333 if (!sx->RCPT_452) /* initialised at MAIL-ack above */
1336 debug_printf("%s: seen first 452 too-many-rcpts\n", __FUNCTION__);
1337 sx->RCPT_452 = TRUE;
1338 sx->next_addr = addr;
1340 addr->transport_return = PENDING_DEFER;
1341 addr->basic_errno = 0;
1345 /* Log temporary errors if there are more hosts to be tried.
1346 If not, log this last one in the == line. */
1348 if (sx->conn_args.host->next)
1349 if (LOGGING(outgoing_port))
1350 log_write(0, LOG_MAIN, "H=%s [%s]:%d %s", sx->conn_args.host->name,
1351 sx->conn_args.host->address,
1352 sx->port == PORT_NONE ? 25 : sx->port, addr->message);
1354 log_write(0, LOG_MAIN, "H=%s [%s]: %s", sx->conn_args.host->name,
1355 sx->conn_args.host->address, addr->message);
1357 #ifndef DISABLE_EVENT
1359 msg_event_raise(US"msg:rcpt:defer", addr);
1362 /* Do not put this message on the list of those waiting for specific
1363 hosts, as otherwise it is likely to be tried too often. */
1365 update_waiting = FALSE;
1367 /* Add a retry item for the address so that it doesn't get tried again
1368 too soon. If address_retry_include_sender is true, add the sender address
1369 to the retry key. */
1371 retry_add_item(addr,
1372 ob->address_retry_include_sender
1373 ? string_sprintf("%s:<%s>", addr->address_retry_key, sender_address)
1374 : addr->address_retry_key,
1380 if (count && !(addr = addr->next))
1382 } /* Loop for next RCPT response */
1384 /* Update where to start at for the next block of responses, unless we
1385 have already handled all the addresses. */
1387 if (addr) sx->sync_addr = addr->next;
1389 /* Handle a response to DATA. If we have not had any good recipients, either
1390 previously or in this block, the response is ignored. */
1392 if (pending_DATA != 0)
1394 DEBUG(D_transport) debug_printf("%s expect data\n", __FUNCTION__);
1395 if (!smtp_read_response(sx, sx->buffer, sizeof(sx->buffer),
1396 '3', ob->command_timeout))
1402 if (errno == ERRNO_TLSFAILURE) /* Error on first TLS read */
1405 if (pending_DATA > 0 || (yield & 1) != 0)
1407 if (errno == 0 && sx->buffer[0] == '4')
1409 errno = ERRNO_DATA4XX;
1410 sx->first_addr->more_errno |= ((sx->buffer[1] - '0')*10 + sx->buffer[2] - '0') << 8;
1414 (void)check_response(sx->conn_args.host, &errno, 0, sx->buffer, &code, &msg, &pass_message);
1415 DEBUG(D_transport) debug_printf("%s\nerror for DATA ignored: pipelining "
1416 "is in use and there were no good recipients\n", msg);
1420 /* All responses read and handled; MAIL (if present) received 2xx and DATA (if
1421 present) received 3xx. If any RCPTs were handled and yielded anything other
1422 than 4xx, yield will be set non-zero. */
1431 /* Try an authenticator's client entry */
1434 try_authenticator(smtp_context * sx, auth_instance * au)
1436 smtp_transport_options_block * ob = sx->conn_args.ob; /* transport options */
1437 host_item * host = sx->conn_args.host; /* host to deliver to */
1440 sx->outblock.authenticating = TRUE;
1441 rc = (au->info->clientcode)(au, sx, ob->command_timeout,
1442 sx->buffer, sizeof(sx->buffer));
1443 sx->outblock.authenticating = FALSE;
1444 DEBUG(D_transport) debug_printf("%s authenticator yielded %d\n", au->name, rc);
1446 /* A temporary authentication failure must hold up delivery to
1447 this host. After a permanent authentication failure, we carry on
1448 to try other authentication methods. If all fail hard, try to
1449 deliver the message unauthenticated unless require_auth was set. */
1454 f.smtp_authenticated = TRUE; /* stops the outer loop */
1455 client_authenticator = au->name;
1456 if (au->set_client_id)
1457 client_authenticated_id = expand_string(au->set_client_id);
1460 /* Failure after writing a command */
1465 /* Failure after reading a response */
1468 if (errno != 0 || sx->buffer[0] != '5') return FAIL;
1469 log_write(0, LOG_MAIN, "%s authenticator failed H=%s [%s] %s",
1470 au->name, host->name, host->address, sx->buffer);
1473 /* Failure by some other means. In effect, the authenticator
1474 decided it wasn't prepared to handle this case. Typically this
1475 is the result of "fail" in an expansion string. Do we need to
1476 log anything here? Feb 2006: a message is now put in the buffer
1477 if logging is required. */
1480 if (*sx->buffer != 0)
1481 log_write(0, LOG_MAIN, "%s authenticator cancelled "
1482 "authentication H=%s [%s] %s", au->name, host->name,
1483 host->address, sx->buffer);
1486 /* Internal problem, message in buffer. */
1489 set_errno_nohost(sx->addrlist, ERRNO_AUTHPROB, string_copy(sx->buffer),
1490 DEFER, FALSE, &sx->delivery_start);
1499 /* Do the client side of smtp-level authentication.
1502 sx smtp connection context
1504 sx->buffer should have the EHLO response from server (gets overwritten)
1507 OK Success, or failed (but not required): global "smtp_authenticated" set
1508 DEFER Failed authentication (and was required)
1509 ERROR Internal problem
1511 FAIL_SEND Failed communications - transmit
1516 smtp_auth(smtp_context * sx)
1518 host_item * host = sx->conn_args.host; /* host to deliver to */
1519 smtp_transport_options_block * ob = sx->conn_args.ob; /* transport options */
1520 int require_auth = verify_check_given_host(CUSS &ob->hosts_require_auth, host);
1521 #ifndef DISABLE_PIPE_CONNECT
1522 unsigned short authbits = tls_out.active.sock >= 0
1523 ? sx->ehlo_resp.crypted_auths : sx->ehlo_resp.cleartext_auths;
1525 uschar * fail_reason = US"server did not advertise AUTH support";
1527 f.smtp_authenticated = FALSE;
1528 client_authenticator = client_authenticated_id = client_authenticated_sender = NULL;
1531 regex_AUTH = regex_must_compile(AUTHS_REGEX, FALSE, TRUE);
1533 /* Is the server offering AUTH? */
1537 #ifndef DISABLE_PIPE_CONNECT
1538 sx->early_pipe_active ? authbits
1541 regex_match_and_setup(regex_AUTH, sx->buffer, 0, -1)
1544 uschar * names = NULL;
1545 expand_nmax = -1; /* reset */
1547 #ifndef DISABLE_PIPE_CONNECT
1548 if (!sx->early_pipe_active)
1550 names = string_copyn(expand_nstring[1], expand_nlength[1]);
1552 /* Must not do this check until after we have saved the result of the
1553 regex match above as the check could be another RE. */
1555 if ( require_auth == OK
1556 || verify_check_given_host(CUSS &ob->hosts_try_auth, host) == OK)
1558 DEBUG(D_transport) debug_printf("scanning authentication mechanisms\n");
1559 fail_reason = US"no common mechanisms were found";
1561 #ifndef DISABLE_PIPE_CONNECT
1562 if (sx->early_pipe_active)
1564 /* Scan our authenticators (which support use by a client and were offered
1565 by the server (checked at cache-write time)), not suppressed by
1566 client_condition. If one is found, attempt to authenticate by calling its
1567 client function. We are limited to supporting up to 16 authenticator
1568 public-names by the number of bits in a short. */
1574 for (bitnum = 0, au = auths;
1575 !f.smtp_authenticated && au && bitnum < 16;
1576 bitnum++, au = au->next) if (authbits & BIT(bitnum))
1578 if ( au->client_condition
1579 && !expand_check_condition(au->client_condition, au->name,
1580 US"client authenticator"))
1582 DEBUG(D_transport) debug_printf("skipping %s authenticator: %s\n",
1583 au->name, "client_condition is false");
1587 /* Found data for a listed mechanism. Call its client entry. Set
1588 a flag in the outblock so that data is overwritten after sending so
1589 that reflections don't show it. */
1591 fail_reason = US"authentication attempt(s) failed";
1593 if ((rc = try_authenticator(sx, au)) != OK)
1600 /* Scan the configured authenticators looking for one which is configured
1601 for use as a client, which is not suppressed by client_condition, and
1602 whose name matches an authentication mechanism supported by the server.
1603 If one is found, attempt to authenticate by calling its client function.
1606 for (auth_instance * au = auths; !f.smtp_authenticated && au; au = au->next)
1611 || ( au->client_condition
1612 && !expand_check_condition(au->client_condition, au->name,
1613 US"client authenticator")))
1615 DEBUG(D_transport) debug_printf("skipping %s authenticator: %s\n",
1617 (au->client)? "client_condition is false" :
1618 "not configured as a client");
1622 /* Loop to scan supported server mechanisms */
1626 int len = Ustrlen(au->public_name);
1629 while (isspace(*p)) p++;
1631 if (strncmpic(au->public_name, p, len) != 0 ||
1632 (p[len] != 0 && !isspace(p[len])))
1634 while (*p != 0 && !isspace(*p)) p++;
1638 /* Found data for a listed mechanism. Call its client entry. Set
1639 a flag in the outblock so that data is overwritten after sending so
1640 that reflections don't show it. */
1642 fail_reason = US"authentication attempt(s) failed";
1644 if ((rc = try_authenticator(sx, au)) != OK)
1647 break; /* If not authenticated, try next authenticator */
1648 } /* Loop for scanning supported server mechanisms */
1649 } /* Loop for further authenticators */
1653 /* If we haven't authenticated, but are required to, give up. */
1655 if (require_auth == OK && !f.smtp_authenticated)
1657 #ifndef DISABLE_PIPE_CONNECT
1658 invalidate_ehlo_cache_entry(sx);
1660 set_errno_nohost(sx->addrlist, ERRNO_AUTHFAIL,
1661 string_sprintf("authentication required but %s", fail_reason), DEFER,
1662 FALSE, &sx->delivery_start);
1670 /* Construct AUTH appendix string for MAIL TO */
1673 sx context for smtp connection
1674 p point in sx->buffer to build string
1675 addrlist chain of potential addresses to deliver
1677 Globals f.smtp_authenticated
1678 client_authenticated_sender
1679 Return True on error, otherwise buffer has (possibly empty) terminated string
1683 smtp_mail_auth_str(smtp_context * sx, uschar * p, address_item * addrlist)
1685 smtp_transport_options_block * ob = sx->conn_args.ob;
1686 uschar * local_authenticated_sender = authenticated_sender;
1689 debug_printf("smtp_mail_auth_str: as<%s> os<%s> SA<%s>\n",
1690 authenticated_sender, ob->authenticated_sender, f.smtp_authenticated?"Y":"N");
1693 if (ob->authenticated_sender)
1695 uschar * new = expand_string(ob->authenticated_sender);
1698 if (!f.expand_string_forcedfail)
1700 uschar *message = string_sprintf("failed to expand "
1701 "authenticated_sender: %s", expand_string_message);
1702 set_errno_nohost(addrlist, ERRNO_EXPANDFAIL, message, DEFER, FALSE, &sx->delivery_start);
1707 local_authenticated_sender = new;
1710 /* Add the authenticated sender address if present */
1712 if ( (f.smtp_authenticated || ob->authenticated_sender_force)
1713 && local_authenticated_sender)
1715 string_format_nt(p, sizeof(sx->buffer) - (p-sx->buffer), " AUTH=%s",
1716 auth_xtextencode(local_authenticated_sender,
1717 Ustrlen(local_authenticated_sender)));
1718 client_authenticated_sender = string_copy(local_authenticated_sender);
1728 typedef struct smtp_compare_s
1730 uschar * current_sender_address;
1731 struct transport_instance * tblock;
1735 /* Create a unique string that identifies this message, it is based on
1736 sender_address, helo_data and tls_certificate if enabled.
1740 smtp_local_identity(uschar * sender, struct transport_instance * tblock)
1742 address_item * addr1;
1743 uschar * if1 = US"";
1744 uschar * helo1 = US"";
1746 uschar * tlsc1 = US"";
1748 uschar * save_sender_address = sender_address;
1749 uschar * local_identity = NULL;
1750 smtp_transport_options_block * ob = SOB tblock->options_block;
1752 sender_address = sender;
1754 addr1 = deliver_make_addr (sender, TRUE);
1755 deliver_set_expansions(addr1);
1758 if1 = expand_string(ob->interface);
1761 helo1 = expand_string(ob->helo_data);
1764 if (ob->tls_certificate)
1765 tlsc1 = expand_string(ob->tls_certificate);
1766 local_identity = string_sprintf ("%s^%s^%s", if1, helo1, tlsc1);
1768 local_identity = string_sprintf ("%s^%s", if1, helo1);
1771 deliver_set_expansions(NULL);
1772 sender_address = save_sender_address;
1774 return local_identity;
1779 /* This routine is a callback that is called from transport_check_waiting.
1780 This function will evaluate the incoming message versus the previous
1781 message. If the incoming message is using a different local identity then
1782 we will veto this new message. */
1785 smtp_are_same_identities(uschar * message_id, smtp_compare_t * s_compare)
1787 uschar * message_local_identity,
1788 * current_local_identity,
1789 * new_sender_address;
1791 current_local_identity =
1792 smtp_local_identity(s_compare->current_sender_address, s_compare->tblock);
1794 if (!(new_sender_address = spool_sender_from_msgid(message_id)))
1798 message_local_identity =
1799 smtp_local_identity(new_sender_address, s_compare->tblock);
1801 return Ustrcmp(current_local_identity, message_local_identity) == 0;
1807 ehlo_response(uschar * buf, unsigned checks)
1809 size_t bsize = Ustrlen(buf);
1811 /* debug_printf("%s: check for 0x%04x\n", __FUNCTION__, checks); */
1814 if ( checks & OPTION_TLS
1815 && pcre_exec(regex_STARTTLS, NULL, CS buf, bsize, 0, PCRE_EOPT, NULL, 0) < 0)
1817 checks &= ~OPTION_TLS;
1819 if ( checks & OPTION_IGNQ
1820 && pcre_exec(regex_IGNOREQUOTA, NULL, CS buf, bsize, 0,
1821 PCRE_EOPT, NULL, 0) < 0)
1822 checks &= ~OPTION_IGNQ;
1824 if ( checks & OPTION_CHUNKING
1825 && pcre_exec(regex_CHUNKING, NULL, CS buf, bsize, 0, PCRE_EOPT, NULL, 0) < 0)
1826 checks &= ~OPTION_CHUNKING;
1828 #ifndef DISABLE_PRDR
1829 if ( checks & OPTION_PRDR
1830 && pcre_exec(regex_PRDR, NULL, CS buf, bsize, 0, PCRE_EOPT, NULL, 0) < 0)
1832 checks &= ~OPTION_PRDR;
1835 if ( checks & OPTION_UTF8
1836 && pcre_exec(regex_UTF8, NULL, CS buf, bsize, 0, PCRE_EOPT, NULL, 0) < 0)
1838 checks &= ~OPTION_UTF8;
1840 if ( checks & OPTION_DSN
1841 && pcre_exec(regex_DSN, NULL, CS buf, bsize, 0, PCRE_EOPT, NULL, 0) < 0)
1842 checks &= ~OPTION_DSN;
1844 if ( checks & OPTION_PIPE
1845 && pcre_exec(regex_PIPELINING, NULL, CS buf, bsize, 0,
1846 PCRE_EOPT, NULL, 0) < 0)
1847 checks &= ~OPTION_PIPE;
1849 if ( checks & OPTION_SIZE
1850 && pcre_exec(regex_SIZE, NULL, CS buf, bsize, 0, PCRE_EOPT, NULL, 0) < 0)
1851 checks &= ~OPTION_SIZE;
1853 #ifndef DISABLE_PIPE_CONNECT
1854 if ( checks & OPTION_EARLY_PIPE
1855 && pcre_exec(regex_EARLY_PIPE, NULL, CS buf, bsize, 0,
1856 PCRE_EOPT, NULL, 0) < 0)
1858 checks &= ~OPTION_EARLY_PIPE;
1860 /* debug_printf("%s: found 0x%04x\n", __FUNCTION__, checks); */
1866 /* Callback for emitting a BDAT data chunk header.
1868 If given a nonzero size, first flush any buffered SMTP commands
1869 then emit the command.
1871 Reap previous SMTP command responses if requested, and always reap
1872 the response from a previous BDAT command.
1875 tctx transport context
1876 chunk_size value for SMTP BDAT command
1878 tc_chunk_last add LAST option to SMTP BDAT command
1879 tc_reap_prev reap response to previous SMTP commands
1883 DEFER TLS error on first read (EHLO-resp); errno set
1887 smtp_chunk_cmd_callback(transport_ctx * tctx, unsigned chunk_size,
1890 smtp_transport_options_block * ob = SOB tctx->tblock->options_block;
1891 smtp_context * sx = tctx->smtp_context;
1895 /* Write SMTP chunk header command. If not reaping responses, note that
1896 there may be more writes (like, the chunk data) done soon. */
1900 #ifndef DISABLE_PIPE_CONNECT
1901 BOOL new_conn = !!(sx->outblock.conn_args);
1903 if((cmd_count = smtp_write_command(sx,
1904 flags & tc_reap_prev ? SCMD_FLUSH : SCMD_MORE,
1905 "BDAT %u%s\r\n", chunk_size, flags & tc_chunk_last ? " LAST" : "")
1906 ) < 0) return ERROR;
1907 if (flags & tc_chunk_last)
1908 data_command = string_copy(big_buffer); /* Save for later error message */
1909 #ifndef DISABLE_PIPE_CONNECT
1910 /* That command write could have been the one that made the connection.
1911 Copy the fd from the client conn ctx (smtp transport specific) to the
1912 generic transport ctx. */
1915 tctx->u.fd = sx->outblock.cctx->sock;
1919 prev_cmd_count = cmd_count += sx->cmd_count;
1921 /* Reap responses for any previous, but not one we just emitted */
1925 if (sx->pending_BDAT)
1928 if (flags & tc_reap_prev && prev_cmd_count > 0)
1930 DEBUG(D_transport) debug_printf("look for %d responses"
1931 " for previous pipelined cmds\n", prev_cmd_count);
1933 switch(sync_responses(sx, prev_cmd_count, 0))
1935 case 1: /* 2xx (only) => OK */
1936 case 3: sx->good_RCPT = TRUE; /* 2xx & 5xx => OK & progress made */
1937 case 2: sx->completed_addr = TRUE; /* 5xx (only) => progress made */
1938 case 0: break; /* No 2xx or 5xx, but no probs */
1940 case -5: errno = ERRNO_TLSFAILURE;
1942 #ifndef DISABLE_PIPE_CONNECT
1943 case -4: /* non-2xx for pipelined banner or EHLO */
1945 case -1: /* Timeout on RCPT */
1946 default: return ERROR; /* I/O error, or any MAIL/DATA error */
1949 if (!sx->pending_BDAT)
1950 pipelining_active = FALSE;
1953 /* Reap response for an outstanding BDAT */
1955 if (sx->pending_BDAT)
1957 DEBUG(D_transport) debug_printf("look for one response for BDAT\n");
1959 if (!smtp_read_response(sx, sx->buffer, sizeof(sx->buffer), '2',
1960 ob->command_timeout))
1962 if (errno == 0 && sx->buffer[0] == '4')
1964 errno = ERRNO_DATA4XX; /*XXX does this actually get used? */
1965 sx->addrlist->more_errno |=
1966 ((sx->buffer[1] - '0')*10 + sx->buffer[2] - '0') << 8;
1971 sx->pending_BDAT = FALSE;
1972 pipelining_active = FALSE;
1974 else if (chunk_size > 0)
1975 sx->pending_BDAT = TRUE;
1978 sx->cmd_count = cmd_count;
1984 /*************************************************
1985 * Make connection for given message *
1986 *************************************************/
1990 sx connection context
1991 suppress_tls if TRUE, don't attempt a TLS connection - this is set for
1992 a second attempt after TLS initialization fails
1994 Returns: OK - the connection was made and the delivery attempted;
1995 fd is set in the conn context, tls_out set up.
1996 DEFER - the connection could not be made, or something failed
1997 while setting up the SMTP session, or there was a
1998 non-message-specific error, such as a timeout.
1999 ERROR - helo_data or add_headers or authenticated_sender is
2000 specified for this transport, and the string failed
2004 smtp_setup_conn(smtp_context * sx, BOOL suppress_tls)
2006 smtp_transport_options_block * ob = sx->conn_args.tblock->options_block;
2007 BOOL pass_message = FALSE;
2008 uschar * message = NULL;
2011 uschar * tls_errstr;
2014 sx->conn_args.ob = ob;
2016 sx->lmtp = strcmpic(ob->protocol, US"lmtp") == 0;
2017 sx->smtps = strcmpic(ob->protocol, US"smtps") == 0;
2018 /* sx->ok = FALSE; */
2019 sx->send_rset = TRUE;
2020 sx->send_quit = TRUE;
2021 sx->setting_up = TRUE;
2023 /* sx->esmtp_sent = FALSE; */
2025 /* sx->utf8_needed = FALSE; */
2027 sx->dsn_all_lasthop = TRUE;
2029 /* sx->conn_args.dane = FALSE; */
2031 verify_check_given_host(CUSS &ob->hosts_require_dane, sx->conn_args.host) == OK;
2033 #ifndef DISABLE_PIPE_CONNECT
2034 /* sx->early_pipe_active = sx->early_pipe_ok = FALSE; */
2035 /* sx->ehlo_resp.cleartext_features = sx->ehlo_resp.crypted_features = 0; */
2036 /* sx->pending_BANNER = sx->pending_EHLO = sx->pending_MAIL = FALSE; */
2039 if ((sx->max_mail = sx->conn_args.tblock->connection_max_messages) == 0) sx->max_mail = 999999;
2040 if ((sx->max_rcpt = sx->conn_args.tblock->max_addresses) == 0) sx->max_rcpt = 999999;
2041 /* sx->peer_offered = 0; */
2042 /* sx->avoid_option = 0; */
2043 sx->igquotstr = US"";
2044 if (!sx->helo_data) sx->helo_data = ob->helo_data;
2045 #ifdef EXPERIMENTAL_DSN_INFO
2046 /* sx->smtp_greeting = NULL; */
2047 /* sx->helo_response = NULL; */
2050 smtp_command = US"initial connection";
2051 /* sx->buffer[0] = '\0'; */
2053 /* Set up the buffer for reading SMTP response packets. */
2055 sx->inblock.buffer = sx->inbuffer;
2056 sx->inblock.buffersize = sizeof(sx->inbuffer);
2057 sx->inblock.ptr = sx->inbuffer;
2058 sx->inblock.ptrend = sx->inbuffer;
2060 /* Set up the buffer for holding SMTP commands while pipelining */
2062 sx->outblock.buffer = sx->outbuffer;
2063 sx->outblock.buffersize = sizeof(sx->outbuffer);
2064 sx->outblock.ptr = sx->outbuffer;
2065 /* sx->outblock.cmd_count = 0; */
2066 /* sx->outblock.authenticating = FALSE; */
2067 /* sx->outblock.conn_args = NULL; */
2069 /* Reset the parameters of a TLS session. */
2072 tls_out.cipher = NULL; /* the one we may use for this transport */
2073 tls_out.ourcert = NULL;
2074 tls_out.peercert = NULL;
2075 tls_out.peerdn = NULL;
2079 tls_out.ocsp = OCSP_NOT_REQ;
2080 #ifndef DISABLE_TLS_RESUME
2081 tls_out.resumption = 0;
2085 /* Flip the legacy TLS-related variables over to the outbound set in case
2086 they're used in the context of the transport. Don't bother resetting
2087 afterward (when being used by a transport) as we're in a subprocess.
2088 For verify, unflipped once the callout is dealt with */
2090 tls_modify_variables(&tls_out);
2095 set_errno_nohost(sx->addrlist, ERRNO_TLSFAILURE, US"TLS support not available",
2096 DEFER, FALSE, &sx->delivery_start);
2101 /* If we have a proxied TLS connection, check usability for this message */
2103 if (continue_hostname && continue_proxy_cipher)
2106 const uschar * sni = US"";
2108 # ifdef SUPPORT_DANE
2109 /* Check if the message will be DANE-verified; if so force its SNI */
2111 tls_out.dane_verified = FALSE;
2112 smtp_port_for_connect(sx->conn_args.host, sx->port);
2113 if ( sx->conn_args.host->dnssec == DS_YES
2114 && ( sx->dane_required
2115 || verify_check_given_host(CUSS &ob->hosts_try_dane, sx->conn_args.host) == OK
2117 switch (rc = tlsa_lookup(sx->conn_args.host, &sx->conn_args.tlsa_dnsa, sx->dane_required))
2119 case OK: sx->conn_args.dane = TRUE;
2120 ob->tls_tempfail_tryclear = FALSE; /* force TLS */
2121 ob->tls_sni = sx->first_addr->domain; /* force SNI */
2123 case FAIL_FORCED: break;
2124 default: set_errno_nohost(sx->addrlist, ERRNO_DNSDEFER,
2125 string_sprintf("DANE error: tlsa lookup %s",
2127 rc, FALSE, &sx->delivery_start);
2128 # ifndef DISABLE_EVENT
2129 (void) event_raise(sx->conn_args.tblock->event_action,
2130 US"dane:fail", sx->dane_required
2131 ? US"dane-required" : US"dnssec-invalid");
2137 /* If the SNI or the DANE status required for the new message differs from the
2138 existing conn drop the connection to force a new one. */
2140 if (ob->tls_sni && !(sni = expand_cstring(ob->tls_sni)))
2141 log_write(0, LOG_MAIN|LOG_PANIC,
2142 "<%s>: failed to expand transport's tls_sni value: %s",
2143 sx->addrlist->address, expand_string_message);
2145 # ifdef SUPPORT_DANE
2146 if ( (continue_proxy_sni ? (Ustrcmp(continue_proxy_sni, sni) == 0) : !*sni)
2147 && continue_proxy_dane == sx->conn_args.dane)
2149 tls_out.sni = US sni;
2150 if ((tls_out.dane_verified = continue_proxy_dane))
2151 sx->conn_args.host->dnssec = DS_YES;
2154 if ((continue_proxy_sni ? (Ustrcmp(continue_proxy_sni, sni) == 0) : !*sni))
2155 tls_out.sni = US sni;
2160 debug_printf("Closing proxied-TLS connection due to SNI mismatch\n");
2162 HDEBUG(D_transport|D_acl|D_v) debug_printf_indent(" SMTP>> QUIT\n");
2163 write(0, "QUIT\r\n", 6);
2165 continue_hostname = continue_proxy_cipher = NULL;
2166 f.continue_more = FALSE;
2167 continue_sequence = 1; /* Unfortunately, this process cannot affect success log
2168 which is done by delivery proc. Would have to pass this
2169 back through reporting pipe. */
2172 #endif /*!DISABLE_TLS*/
2174 /* Make a connection to the host if this isn't a continued delivery, and handle
2175 the initial interaction and HELO/EHLO/LHLO. Connect timeout errors are handled
2176 specially so they can be identified for retries. */
2178 if (!continue_hostname)
2181 HDEBUG(D_verify) debug_printf("interface=%s port=%d\n", sx->conn_args.interface, sx->port);
2183 /* Arrange to report to calling process this is a new connection */
2185 clearflag(sx->first_addr, af_cont_conn);
2186 setflag(sx->first_addr, af_new_conn);
2188 /* Get the actual port the connection will use, into sx->conn_args.host */
2190 smtp_port_for_connect(sx->conn_args.host, sx->port);
2193 /* Do TLSA lookup for DANE */
2195 tls_out.dane_verified = FALSE;
2196 tls_out.tlsa_usage = 0;
2198 if (sx->conn_args.host->dnssec == DS_YES)
2201 if( sx->dane_required
2202 || verify_check_given_host(CUSS &ob->hosts_try_dane, sx->conn_args.host) == OK
2204 switch (rc = tlsa_lookup(sx->conn_args.host, &sx->conn_args.tlsa_dnsa, sx->dane_required))
2206 case OK: sx->conn_args.dane = TRUE;
2207 ob->tls_tempfail_tryclear = FALSE; /* force TLS */
2208 ob->tls_sni = sx->first_addr->domain; /* force SNI */
2210 case FAIL_FORCED: break;
2211 default: set_errno_nohost(sx->addrlist, ERRNO_DNSDEFER,
2212 string_sprintf("DANE error: tlsa lookup %s",
2214 rc, FALSE, &sx->delivery_start);
2215 # ifndef DISABLE_EVENT
2216 (void) event_raise(sx->conn_args.tblock->event_action,
2217 US"dane:fail", sx->dane_required
2218 ? US"dane-required" : US"dnssec-invalid");
2223 else if (sx->dane_required)
2225 set_errno_nohost(sx->addrlist, ERRNO_DNSDEFER,
2226 string_sprintf("DANE error: %s lookup not DNSSEC", sx->conn_args.host->name),
2227 FAIL, FALSE, &sx->delivery_start);
2228 # ifndef DISABLE_EVENT
2229 (void) event_raise(sx->conn_args.tblock->event_action,
2230 US"dane:fail", US"dane-required");
2237 /* Make the TCP connection */
2239 sx->cctx.tls_ctx = NULL;
2240 sx->inblock.cctx = sx->outblock.cctx = &sx->cctx;
2241 #ifdef EXPERIMENTAL_ESMTP_LIMITS
2242 sx->peer_limit_mail = sx->peer_limit_rcpt = sx->peer_limit_rcptdom =
2244 sx->avoid_option = sx->peer_offered = smtp_peer_options = 0;
2246 #ifndef DISABLE_PIPE_CONNECT
2247 if ( verify_check_given_host(CUSS &ob->hosts_pipe_connect,
2248 sx->conn_args.host) == OK)
2250 /* We don't find out the local ip address until the connect, so if
2251 the helo string might use it avoid doing early-pipelining. */
2254 || !Ustrstr(sx->helo_data, "$sending_ip_address")
2255 || Ustrstr(sx->helo_data, "def:sending_ip_address")
2258 sx->early_pipe_ok = TRUE;
2259 if ( read_ehlo_cache_entry(sx)
2260 && sx->ehlo_resp.cleartext_features & OPTION_EARLY_PIPE)
2263 debug_printf("Using cached cleartext PIPE_CONNECT\n");
2264 sx->early_pipe_active = TRUE;
2265 sx->peer_offered = sx->ehlo_resp.cleartext_features;
2268 else DEBUG(D_transport)
2269 debug_printf("helo needs $sending_ip_address\n");
2272 if (sx->early_pipe_active)
2273 sx->outblock.conn_args = &sx->conn_args;
2277 blob lazy_conn = {.data = NULL};
2278 /* For TLS-connect, a TFO lazy-connect is useful since the Client Hello
2279 can go on the TCP SYN. */
2281 if ((sx->cctx.sock = smtp_connect(&sx->conn_args,
2282 sx->smtps ? &lazy_conn : NULL)) < 0)
2284 set_errno_nohost(sx->addrlist,
2285 errno == ETIMEDOUT ? ERRNO_CONNECTTIMEOUT : errno,
2286 sx->verify ? US strerror(errno) : NULL,
2287 DEFER, FALSE, &sx->delivery_start);
2288 sx->send_quit = FALSE;
2292 (void) setsockopt(sx->cctx.sock, IPPROTO_TCP, TCP_QUICKACK, US &off,
2296 /* Expand the greeting message while waiting for the initial response. (Makes
2297 sense if helo_data contains ${lookup dnsdb ...} stuff). The expansion is
2298 delayed till here so that $sending_interface and $sending_port are set. */
2299 /*XXX early-pipe: they still will not be. Is there any way to find out what they
2300 will be? Somehow I doubt it. */
2303 if (!(sx->helo_data = expand_string(sx->helo_data)))
2305 log_write(0, LOG_MAIN|LOG_PANIC,
2306 "<%s>: failed to expand transport's helo_data value for callout: %s",
2307 sx->addrlist->address, expand_string_message);
2312 expand_string_message = NULL;
2313 if ((sx->helo_data = string_domain_utf8_to_alabel(sx->helo_data,
2314 &expand_string_message)),
2315 expand_string_message)
2317 log_write(0, LOG_MAIN|LOG_PANIC,
2318 "<%s>: failed to expand transport's helo_data value for callout: %s",
2319 sx->addrlist->address, expand_string_message);
2321 sx->helo_data = NULL;
2325 /* The first thing is to wait for an initial OK response. The dreaded "goto"
2326 is nevertheless a reasonably clean way of programming this kind of logic,
2327 where you want to escape on any error. */
2331 #ifndef DISABLE_PIPE_CONNECT
2332 if (sx->early_pipe_active)
2334 sx->pending_BANNER = TRUE; /* sync_responses() must eventually handle */
2335 sx->outblock.cmd_count = 1;
2340 if (!smtp_reap_banner(sx))
2341 goto RESPONSE_FAILED;
2344 #ifndef DISABLE_EVENT
2347 lookup_dnssec_authenticated = sx->conn_args.host->dnssec==DS_YES ? US"yes"
2348 : sx->conn_args.host->dnssec==DS_NO ? US"no" : NULL;
2349 s = event_raise(sx->conn_args.tblock->event_action, US"smtp:connect", sx->buffer);
2352 set_errno_nohost(sx->addrlist, ERRNO_EXPANDFAIL,
2353 string_sprintf("deferred by smtp:connect event expansion: %s", s),
2354 DEFER, FALSE, &sx->delivery_start);
2361 /* Now check if the helo_data expansion went well, and sign off cleanly if
2366 message = string_sprintf("failed to expand helo_data: %s",
2367 expand_string_message);
2368 set_errno_nohost(sx->addrlist, ERRNO_EXPANDFAIL, message, DEFER, FALSE, &sx->delivery_start);
2374 /** Debugging without sending a message
2375 sx->addrlist->transport_return = DEFER;
2379 /* Errors that occur after this point follow an SMTP command, which is
2380 left in big_buffer by smtp_write_command() for use in error messages. */
2382 smtp_command = big_buffer;
2384 /* Tell the remote who we are...
2386 February 1998: A convention has evolved that ESMTP-speaking MTAs include the
2387 string "ESMTP" in their greeting lines, so make Exim send EHLO if the
2388 greeting is of this form. The assumption was that the far end supports it
2389 properly... but experience shows that there are some that give 5xx responses,
2390 even though the banner includes "ESMTP" (there's a bloody-minded one that
2391 says "ESMTP not spoken here"). Cope with that case.
2393 September 2000: Time has passed, and it seems reasonable now to always send
2394 EHLO at the start. It is also convenient to make the change while installing
2397 July 2003: Joachim Wieland met a broken server that advertises "PIPELINING"
2398 but times out after sending MAIL FROM, RCPT TO and DATA all together. There
2399 would be no way to send out the mails, so there is now a host list
2400 "hosts_avoid_esmtp" that disables ESMTP for special hosts and solves the
2401 PIPELINING problem as well. Maybe it can also be useful to cure other
2402 problems with broken servers.
2404 Exim originally sent "Helo" at this point and ran for nearly a year that way.
2405 Then somebody tried it with a Microsoft mailer... It seems that all other
2406 mailers use upper case for some reason (the RFC is quite clear about case
2407 independence) so, for peace of mind, I gave in. */
2409 sx->esmtp = verify_check_given_host(CUSS &ob->hosts_avoid_esmtp, sx->conn_args.host) != OK;
2411 /* Alas; be careful, since this goto is not an error-out, so conceivably
2412 we might set data between here and the target which we assume to exist
2413 and be usable. I can see this coming back to bite us. */
2417 smtp_peer_options |= OPTION_TLS;
2418 suppress_tls = FALSE;
2419 ob->tls_tempfail_tryclear = FALSE;
2420 smtp_command = US"SSL-on-connect";
2427 if (smtp_write_command(sx,
2428 #ifndef DISABLE_PIPE_CONNECT
2429 sx->early_pipe_active ? SCMD_BUFFER :
2432 "%s %s\r\n", sx->lmtp ? "LHLO" : "EHLO", sx->helo_data) < 0)
2434 sx->esmtp_sent = TRUE;
2436 #ifndef DISABLE_PIPE_CONNECT
2437 if (sx->early_pipe_active)
2439 sx->pending_EHLO = TRUE;
2441 /* If we have too many authenticators to handle and might need to AUTH
2442 for this transport, pipeline no further as we will need the
2443 list of auth methods offered. Reap the banner and EHLO. */
2445 if ( (ob->hosts_require_auth || ob->hosts_try_auth)
2446 && f.smtp_in_early_pipe_no_auth)
2448 DEBUG(D_transport) debug_printf("may need to auth, so pipeline no further\n");
2449 if (smtp_write_command(sx, SCMD_FLUSH, NULL) < 0)
2451 if (sync_responses(sx, 2, 0) != 0)
2454 debug_printf("failed reaping pipelined cmd responses\n");
2455 goto RESPONSE_FAILED;
2457 sx->early_pipe_active = FALSE;
2462 if (!smtp_reap_ehlo(sx))
2463 goto RESPONSE_FAILED;
2467 debug_printf("not sending EHLO (host matches hosts_avoid_esmtp)\n");
2469 #ifndef DISABLE_PIPE_CONNECT
2470 if (!sx->early_pipe_active)
2475 int n = sizeof(sx->buffer);
2476 uschar * rsp = sx->buffer;
2478 if (sx->esmtp_sent && (n = Ustrlen(sx->buffer)) < sizeof(sx->buffer)/2)
2479 { rsp = sx->buffer + n + 1; n = sizeof(sx->buffer) - n; }
2481 if (smtp_write_command(sx, SCMD_FLUSH, "HELO %s\r\n", sx->helo_data) < 0)
2483 good_response = smtp_read_response(sx, rsp, n, '2', ob->command_timeout);
2484 #ifdef EXPERIMENTAL_DSN_INFO
2485 sx->helo_response = string_copy(rsp);
2489 /* Handle special logging for a closed connection after HELO
2490 when had previously sent EHLO */
2492 if (rsp != sx->buffer && rsp[0] == 0 && (errno == 0 || errno == ECONNRESET))
2494 errno = ERRNO_SMTPCLOSED;
2495 goto EHLOHELO_FAILED;
2497 memmove(sx->buffer, rsp, Ustrlen(rsp));
2498 goto RESPONSE_FAILED;
2502 if (sx->esmtp || sx->lmtp)
2504 #ifndef DISABLE_PIPE_CONNECT
2505 if (!sx->early_pipe_active)
2508 sx->peer_offered = ehlo_response(sx->buffer,
2509 OPTION_TLS /* others checked later */
2510 #ifndef DISABLE_PIPE_CONNECT
2511 | (sx->early_pipe_ok
2513 | OPTION_CHUNKING | OPTION_PRDR | OPTION_DSN | OPTION_PIPE | OPTION_SIZE
2522 #ifdef EXPERIMENTAL_ESMTP_LIMITS
2523 if (tls_out.active.sock >= 0 || !(sx->peer_offered & OPTION_TLS))
2525 ehlo_response_limits_read(sx);
2526 ehlo_response_limits_apply(sx);
2529 #ifndef DISABLE_PIPE_CONNECT
2530 if (sx->early_pipe_ok)
2532 sx->ehlo_resp.cleartext_features = sx->peer_offered;
2534 if ( (sx->peer_offered & (OPTION_PIPE | OPTION_EARLY_PIPE))
2535 == (OPTION_PIPE | OPTION_EARLY_PIPE))
2537 DEBUG(D_transport) debug_printf("PIPE_CONNECT usable in future for this IP\n");
2538 sx->ehlo_resp.cleartext_auths = study_ehlo_auths(sx);
2539 write_ehlo_cache_entry(sx);
2545 /* Set tls_offered if the response to EHLO specifies support for STARTTLS. */
2548 smtp_peer_options |= sx->peer_offered & OPTION_TLS;
2553 /* For continuing deliveries down the same channel, having re-exec'd the socket
2554 is the standard input; for a socket held open from verify it is recorded
2555 in the cutthrough context block. Either way we don't need to redo EHLO here
2556 (but may need to do so for TLS - see below).
2557 Set up the pointer to where subsequent commands will be left, for
2558 error messages. Note that smtp_peer_options will have been
2559 set from the command line if they were set in the process that passed the
2562 /*XXX continue case needs to propagate DSN_INFO, prob. in deliver.c
2563 as the continue goes via transport_pass_socket() and doublefork and exec.
2564 It does not wait. Unclear how we keep separate host's responses
2565 separate - we could match up by host ip+port as a bodge. */
2569 if (cutthrough.cctx.sock >= 0 && cutthrough.callout_hold_only)
2571 sx->cctx = cutthrough.cctx;
2572 sx->conn_args.host->port = sx->port = cutthrough.host.port;
2576 sx->cctx.sock = 0; /* stdin */
2577 sx->cctx.tls_ctx = NULL;
2578 smtp_port_for_connect(sx->conn_args.host, sx->port); /* Record the port that was used */
2580 sx->inblock.cctx = sx->outblock.cctx = &sx->cctx;
2581 smtp_command = big_buffer;
2582 sx->peer_offered = smtp_peer_options;
2583 #ifdef EXPERIMENTAL_ESMTP_LIMITS
2584 /* Limits passed by cmdline over exec. */
2585 ehlo_limits_apply(sx,
2586 sx->peer_limit_mail = continue_limit_mail,
2587 sx->peer_limit_rcpt = continue_limit_rcpt,
2588 sx->peer_limit_rcptdom = continue_limit_rcptdom);
2590 sx->helo_data = NULL; /* ensure we re-expand ob->helo_data */
2592 /* For a continued connection with TLS being proxied for us, or a
2593 held-open verify connection with TLS, nothing more to do. */
2595 if ( continue_proxy_cipher
2596 || (cutthrough.cctx.sock >= 0 && cutthrough.callout_hold_only
2597 && cutthrough.is_tls)
2600 sx->pipelining_used = pipelining_active = !!(smtp_peer_options & OPTION_PIPE);
2601 HDEBUG(D_transport) debug_printf("continued connection, %s TLS\n",
2602 continue_proxy_cipher ? "proxied" : "verify conn with");
2605 HDEBUG(D_transport) debug_printf("continued connection, no TLS\n");
2608 /* If TLS is available on this connection, whether continued or not, attempt to
2609 start up a TLS session, unless the host is in hosts_avoid_tls. If successful,
2610 send another EHLO - the server may give a different answer in secure mode. We
2611 use a separate buffer for reading the response to STARTTLS so that if it is
2612 negative, the original EHLO data is available for subsequent analysis, should
2613 the client not be required to use TLS. If the response is bad, copy the buffer
2614 for error analysis. */
2617 if ( smtp_peer_options & OPTION_TLS
2619 && verify_check_given_host(CUSS &ob->hosts_avoid_tls, sx->conn_args.host) != OK
2621 || verify_check_given_host(CUSS &ob->hosts_verify_avoid_tls, sx->conn_args.host) != OK
2624 uschar buffer2[4096];
2626 if (smtp_write_command(sx, SCMD_FLUSH, "STARTTLS\r\n") < 0)
2629 #ifndef DISABLE_PIPE_CONNECT
2630 /* If doing early-pipelining reap the banner and EHLO-response but leave
2631 the response for the STARTTLS we just sent alone. On fail, assume wrong
2632 cached capability and retry with the pipelining disabled. */
2634 if (sx->early_pipe_active && sync_responses(sx, 2, 0) != 0)
2637 debug_printf("failed reaping pipelined cmd responses\n");
2638 close(sx->cctx.sock);
2640 sx->early_pipe_active = FALSE;
2641 goto PIPE_CONNECT_RETRY;
2645 /* If there is an I/O error, transmission of this message is deferred. If
2646 there is a temporary rejection of STARRTLS and tls_tempfail_tryclear is
2647 false, we also defer. However, if there is a temporary rejection of STARTTLS
2648 and tls_tempfail_tryclear is true, or if there is an outright rejection of
2649 STARTTLS, we carry on. This means we will try to send the message in clear,
2650 unless the host is in hosts_require_tls (tested below). */
2652 if (!smtp_read_response(sx, buffer2, sizeof(buffer2), '2', ob->command_timeout))
2656 || (buffer2[0] == '4' && !ob->tls_tempfail_tryclear)
2659 Ustrncpy(sx->buffer, buffer2, sizeof(sx->buffer));
2660 sx->buffer[sizeof(sx->buffer)-1] = '\0';
2661 goto RESPONSE_FAILED;
2665 /* STARTTLS accepted: try to negotiate a TLS session. */
2670 if (!tls_client_start(&sx->cctx, &sx->conn_args, sx->addrlist, &tls_out, &tls_errstr))
2672 /* TLS negotiation failed; give an error. From outside, this function may
2673 be called again to try in clear on a new connection, if the options permit
2674 it for this host. */
2676 DEBUG(D_tls) debug_printf("TLS session fail: %s\n", tls_errstr);
2678 # ifdef SUPPORT_DANE
2679 if (sx->conn_args.dane)
2681 log_write(0, LOG_MAIN,
2682 "DANE attempt failed; TLS connection to %s [%s]: %s",
2683 sx->conn_args.host->name, sx->conn_args.host->address, tls_errstr);
2684 # ifndef DISABLE_EVENT
2685 (void) event_raise(sx->conn_args.tblock->event_action,
2686 US"dane:fail", US"validation-failure"); /* could do with better detail */
2691 errno = ERRNO_TLSFAILURE;
2692 message = string_sprintf("TLS session: %s", tls_errstr);
2693 sx->send_quit = FALSE;
2696 sx->send_tlsclose = TRUE;
2698 /* TLS session is set up. Check the inblock fill level. If there is
2699 content then as we have not yet done a tls read it must have arrived before
2700 the TLS handshake, in-clear. That violates the sync requirement of the
2701 STARTTLS RFC, so fail. */
2703 if (sx->inblock.ptr != sx->inblock.ptrend)
2707 int i = sx->inblock.ptrend - sx->inblock.ptr;
2708 debug_printf("unused data in input buffer after ack for STARTTLS:\n"
2710 i > 100 ? 100 : i, sx->inblock.ptr, i > 100 ? "..." : "");
2712 tls_errstr = US"synch error before connect";
2713 goto TLS_CONN_FAILED;
2716 smtp_peer_options_wrap = smtp_peer_options;
2717 for (address_item * addr = sx->addrlist; addr; addr = addr->next)
2718 if (addr->transport_return == PENDING_DEFER)
2720 addr->cipher = tls_out.cipher;
2721 addr->ourcert = tls_out.ourcert;
2722 addr->peercert = tls_out.peercert;
2723 addr->peerdn = tls_out.peerdn;
2724 addr->ocsp = tls_out.ocsp;
2725 addr->tlsver = tls_out.ver;
2730 /* if smtps, we'll have smtp_command set to something else; always safe to
2732 smtp_command = big_buffer;
2734 /* If we started TLS, redo the EHLO/LHLO exchange over the secure channel. If
2735 helo_data is null, we are dealing with a connection that was passed from
2736 another process, and so we won't have expanded helo_data above. We have to
2737 expand it here. $sending_ip_address and $sending_port are set up right at the
2738 start of the Exim process (in exim.c). */
2740 if (tls_out.active.sock >= 0)
2742 uschar * greeting_cmd;
2744 if (!sx->helo_data && !(sx->helo_data = expand_string(ob->helo_data)))
2746 uschar *message = string_sprintf("failed to expand helo_data: %s",
2747 expand_string_message);
2748 set_errno_nohost(sx->addrlist, ERRNO_EXPANDFAIL, message, DEFER, FALSE, &sx->delivery_start);
2753 #ifndef DISABLE_PIPE_CONNECT
2754 /* For SMTPS there is no cleartext early-pipe; use the crypted permission bit.
2755 We're unlikely to get the group sent and delivered before the server sends its
2756 banner, but it's still worth sending as a group.
2757 For STARTTLS allow for cleartext early-pipe but no crypted early-pipe, but not
2760 if (sx->smtps ? sx->early_pipe_ok : sx->early_pipe_active)
2762 sx->peer_offered = sx->ehlo_resp.crypted_features;
2763 if ((sx->early_pipe_active =
2764 !!(sx->ehlo_resp.crypted_features & OPTION_EARLY_PIPE)))
2765 DEBUG(D_transport) debug_printf("Using cached crypted PIPE_CONNECT\n");
2768 #ifdef EXPERIMMENTAL_ESMTP_LIMITS
2769 /* As we are about to send another EHLO, forget any LIMITS received so far. */
2770 sx->peer_limit_mail = sx->peer_limit_rcpt = sx->peer_limit_rcptdom = 0;
2771 if ((sx->max_mail = sx->conn_args.tblock->connection_max_message) == 0) sx->max_mail = 999999;
2772 if ((sx->max_rcpt = sx->conn_args.tblock->max_addresses) == 0) sx->max_rcpt = 999999;
2773 sx->single_rcpt_domain = FALSE;
2776 /* For SMTPS we need to wait for the initial OK response. */
2778 #ifndef DISABLE_PIPE_CONNECT
2779 if (sx->early_pipe_active)
2781 sx->pending_BANNER = TRUE;
2782 sx->outblock.cmd_count = 1;
2786 if (!smtp_reap_banner(sx))
2787 goto RESPONSE_FAILED;
2790 greeting_cmd = US"LHLO";
2792 greeting_cmd = US"EHLO";
2795 greeting_cmd = US"HELO";
2797 debug_printf("not sending EHLO (host matches hosts_avoid_esmtp)\n");
2800 if (smtp_write_command(sx,
2801 #ifndef DISABLE_PIPE_CONNECT
2802 sx->early_pipe_active ? SCMD_BUFFER :
2805 "%s %s\r\n", greeting_cmd, sx->helo_data) < 0)
2808 #ifndef DISABLE_PIPE_CONNECT
2809 if (sx->early_pipe_active)
2810 sx->pending_EHLO = TRUE;
2814 if (!smtp_reap_ehlo(sx))
2817 /* The GnuTLS layer in Exim only spots a server-rejection of a client
2818 cert late, under TLS1.3 - which means here; the first time we try to
2819 receive crypted data. Treat it as if it was a connect-time failure.
2820 See also the early-pipe equivalent... which will be hard; every call
2821 to sync_responses will need to check the result.
2822 It would be nicer to have GnuTLS check the cert during the handshake.
2823 Can it do that, with all the flexibility we need? */
2825 tls_errstr = US"error on first read";
2826 goto TLS_CONN_FAILED;
2829 goto RESPONSE_FAILED;
2831 smtp_peer_options = 0;
2835 /* If the host is required to use a secure channel, ensure that we
2839 # ifdef SUPPORT_DANE
2840 || sx->conn_args.dane
2842 || verify_check_given_host(CUSS &ob->hosts_require_tls, sx->conn_args.host) == OK
2845 errno = ERRNO_TLSREQUIRED;
2846 message = string_sprintf("a TLS session is required, but %s",
2847 smtp_peer_options & OPTION_TLS
2848 ? "an attempt to start TLS failed" : "the server did not offer TLS support");
2849 # if defined(SUPPORT_DANE) && !defined(DISABLE_EVENT)
2850 if (sx->conn_args.dane)
2851 (void) event_raise(sx->conn_args.tblock->event_action, US"dane:fail",
2852 smtp_peer_options & OPTION_TLS
2853 ? US"validation-failure" /* could do with better detail */
2854 : US"starttls-not-supported");
2858 #endif /*DISABLE_TLS*/
2860 /* If TLS is active, we have just started it up and re-done the EHLO command,
2861 so its response needs to be analyzed. If TLS is not active and this is a
2862 continued session down a previously-used socket, we haven't just done EHLO, so
2865 if ( !continue_hostname
2867 || tls_out.active.sock >= 0
2871 if (sx->esmtp || sx->lmtp)
2873 #ifndef DISABLE_PIPE_CONNECT
2874 if (!sx->early_pipe_active)
2877 sx->peer_offered = ehlo_response(sx->buffer,
2879 #ifndef DISABLE_PIPE_CONNECT
2880 | (sx->lmtp && ob->lmtp_ignore_quota ? OPTION_IGNQ : 0)
2881 | OPTION_DSN | OPTION_PIPE | OPTION_SIZE
2882 | OPTION_CHUNKING | OPTION_PRDR | OPTION_UTF8
2883 | (tls_out.active.sock >= 0 ? OPTION_EARLY_PIPE : 0) /* not for lmtp */
2887 | (sx->lmtp && ob->lmtp_ignore_quota ? OPTION_IGNQ : 0)
2890 # ifdef SUPPORT_I18N
2891 | (sx->addrlist->prop.utf8_msg ? OPTION_UTF8 : 0)
2892 /*XXX if we hand peercaps on to continued-conn processes,
2893 must not depend on this addr */
2897 | (ob->size_addition >= 0 ? OPTION_SIZE : 0)
2900 #ifndef DISABLE_PIPE_CONNECT
2901 if (tls_out.active.sock >= 0)
2902 sx->ehlo_resp.crypted_features = sx->peer_offered;
2905 #ifdef EXPERIMENTAL_ESMTP_LIMITS
2906 if (tls_out.active.sock >= 0 || !(sx->peer_offered & OPTION_TLS))
2908 ehlo_response_limits_read(sx);
2909 ehlo_response_limits_apply(sx);
2914 /* Set for IGNOREQUOTA if the response to LHLO specifies support and the
2915 lmtp_ignore_quota option was set. */
2917 sx->igquotstr = sx->peer_offered & OPTION_IGNQ ? US" IGNOREQUOTA" : US"";
2919 /* If the response to EHLO specified support for the SIZE parameter, note
2920 this, provided size_addition is non-negative. */
2922 smtp_peer_options |= sx->peer_offered & OPTION_SIZE;
2924 /* Note whether the server supports PIPELINING. If hosts_avoid_esmtp matched
2925 the current host, esmtp will be false, so PIPELINING can never be used. If
2926 the current host matches hosts_avoid_pipelining, don't do it. */
2928 if ( sx->peer_offered & OPTION_PIPE
2929 && verify_check_given_host(CUSS &ob->hosts_avoid_pipelining, sx->conn_args.host) != OK)
2930 smtp_peer_options |= OPTION_PIPE;
2932 DEBUG(D_transport) debug_printf("%susing PIPELINING\n",
2933 smtp_peer_options & OPTION_PIPE ? "" : "not ");
2935 if ( sx->peer_offered & OPTION_CHUNKING
2936 && verify_check_given_host(CUSS &ob->hosts_try_chunking, sx->conn_args.host) != OK)
2937 sx->peer_offered &= ~OPTION_CHUNKING;
2939 if (sx->peer_offered & OPTION_CHUNKING)
2940 DEBUG(D_transport) debug_printf("CHUNKING usable\n");
2942 #ifndef DISABLE_PRDR
2943 if ( sx->peer_offered & OPTION_PRDR
2944 && verify_check_given_host(CUSS &ob->hosts_try_prdr, sx->conn_args.host) != OK)
2945 sx->peer_offered &= ~OPTION_PRDR;
2947 if (sx->peer_offered & OPTION_PRDR)
2948 DEBUG(D_transport) debug_printf("PRDR usable\n");
2951 /* Note if the server supports DSN */
2952 smtp_peer_options |= sx->peer_offered & OPTION_DSN;
2953 DEBUG(D_transport) debug_printf("%susing DSN\n",
2954 sx->peer_offered & OPTION_DSN ? "" : "not ");
2956 #ifndef DISABLE_PIPE_CONNECT
2957 if ( sx->early_pipe_ok
2958 && !sx->early_pipe_active
2959 && tls_out.active.sock >= 0
2960 && smtp_peer_options & OPTION_PIPE
2961 && ( sx->ehlo_resp.cleartext_features | sx->ehlo_resp.crypted_features)
2962 & OPTION_EARLY_PIPE)
2964 DEBUG(D_transport) debug_printf("PIPE_CONNECT usable in future for this IP\n");
2965 sx->ehlo_resp.crypted_auths = study_ehlo_auths(sx);
2966 write_ehlo_cache_entry(sx);
2970 /* Note if the response to EHLO specifies support for the AUTH extension.
2971 If it has, check that this host is one we want to authenticate to, and do
2972 the business. The host name and address must be available when the
2973 authenticator's client driver is running. */
2975 switch (yield = smtp_auth(sx))
2977 default: goto SEND_QUIT;
2979 case FAIL_SEND: goto SEND_FAILED;
2980 case FAIL: goto RESPONSE_FAILED;
2984 sx->pipelining_used = pipelining_active = !!(smtp_peer_options & OPTION_PIPE);
2986 /* The setting up of the SMTP call is now complete. Any subsequent errors are
2987 message-specific. */
2989 sx->setting_up = FALSE;
2992 if (sx->addrlist->prop.utf8_msg)
2996 /* If the transport sets a downconversion mode it overrides any set by ACL
2999 if ((s = ob->utf8_downconvert))
3001 if (!(s = expand_string(s)))
3003 message = string_sprintf("failed to expand utf8_downconvert: %s",
3004 expand_string_message);
3005 set_errno_nohost(sx->addrlist, ERRNO_EXPANDFAIL, message, DEFER, FALSE, &sx->delivery_start);
3011 case '1': sx->addrlist->prop.utf8_downcvt = TRUE;
3012 sx->addrlist->prop.utf8_downcvt_maybe = FALSE;
3014 case '0': sx->addrlist->prop.utf8_downcvt = FALSE;
3015 sx->addrlist->prop.utf8_downcvt_maybe = FALSE;
3017 case '-': if (s[1] == '1')
3019 sx->addrlist->prop.utf8_downcvt = FALSE;
3020 sx->addrlist->prop.utf8_downcvt_maybe = TRUE;
3026 sx->utf8_needed = !sx->addrlist->prop.utf8_downcvt
3027 && !sx->addrlist->prop.utf8_downcvt_maybe;
3028 DEBUG(D_transport) if (!sx->utf8_needed)
3029 debug_printf("utf8: %s downconvert\n",
3030 sx->addrlist->prop.utf8_downcvt ? "mandatory" : "optional");
3033 /* If this is an international message we need the host to speak SMTPUTF8 */
3034 if (sx->utf8_needed && !(sx->peer_offered & OPTION_UTF8))
3036 errno = ERRNO_UTF8_FWD;
3037 goto RESPONSE_FAILED;
3039 #endif /*SUPPORT_I18N*/
3048 if (errno == ECONNREFUSED) /* first-read error on a TFO conn */
3050 /* There is a testing facility for simulating a connection timeout, as I
3051 can't think of any other way of doing this. It converts a connection
3052 refused into a timeout if the timeout is set to 999999. This is done for
3053 a 3whs connection in ip_connect(), but a TFO connection does not error
3054 there - instead it gets ECONNREFUSED on the first data read. Tracking
3055 that a TFO really was done is too hard, or we would set a
3056 sx->pending_conn_done bit and test that in smtp_reap_banner() and
3057 smtp_reap_ehlo(). That would let us also add the conn-timeout to the
3060 if (f.running_in_test_harness && ob->connect_timeout == 999999)
3062 set_errno_nohost(sx->addrlist,
3063 errno == ETIMEDOUT ? ERRNO_CONNECTTIMEOUT : errno,
3064 sx->verify ? US strerror(errno) : NULL,
3065 DEFER, FALSE, &sx->delivery_start);
3066 sx->send_quit = FALSE;
3070 /* really an error on an SMTP read */
3072 sx->send_quit = check_response(sx->conn_args.host, &errno, sx->addrlist->more_errno,
3073 sx->buffer, &code, &message, &pass_message);
3079 message = US string_sprintf("send() to %s [%s] failed: %s",
3080 sx->conn_args.host->name, sx->conn_args.host->address, strerror(errno));
3081 sx->send_quit = FALSE;
3087 message = string_sprintf("Remote host closed connection in response to %s"
3088 " (EHLO response was: %s)", smtp_command, sx->buffer);
3089 sx->send_quit = FALSE;
3093 /* This label is jumped to directly when a TLS negotiation has failed,
3094 or was not done for a host for which it is required. Values will be set
3095 in message and errno, and setting_up will always be true. Treat as
3096 a temporary error. */
3100 code = '4', yield = DEFER;
3104 /* The failure happened while setting up the call; see if the failure was
3105 a 5xx response (this will either be on connection, or following HELO - a 5xx
3106 after EHLO causes it to try HELO). If so, and there are no more hosts to try,
3107 fail all addresses, as this host is never going to accept them. For other
3108 errors during setting up (timeouts or whatever), defer all addresses, and
3109 yield DEFER, so that the host is not tried again for a while.
3111 XXX This peeking for another host feels like a layering violation. We want
3112 to note the host as unusable, but down here we shouldn't know if this was
3113 the last host to try for the addr(list). Perhaps the upper layer should be
3114 the one to do set_errno() ? The problem is that currently the addr is where
3115 errno etc. are stashed, but until we run out of hosts to try the errors are
3116 host-specific. Maybe we should enhance the host_item definition? */
3119 sx->ok = FALSE; /* For when reached by GOTO */
3120 set_errno(sx->addrlist, errno, message,
3121 sx->conn_args.host->next
3125 || errno == ERRNO_UTF8_FWD
3129 errno == ECONNREFUSED ? NULL : sx->conn_args.host,
3130 #ifdef EXPERIMENTAL_DSN_INFO
3131 sx->smtp_greeting, sx->helo_response,
3133 &sx->delivery_start);
3140 (void)smtp_write_command(sx, SCMD_FLUSH, "QUIT\r\n");
3143 if (sx->cctx.tls_ctx)
3145 if (sx->send_tlsclose)
3147 tls_close(sx->cctx.tls_ctx, TLS_SHUTDOWN_NOWAIT);
3148 sx->send_tlsclose = FALSE;
3150 sx->cctx.tls_ctx = NULL;
3154 /* Close the socket, and return the appropriate value, first setting
3155 works because the NULL setting is passed back to the calling process, and
3156 remote_max_parallel is forced to 1 when delivering over an existing connection,
3159 HDEBUG(D_transport|D_acl|D_v) debug_printf_indent(" SMTP(close)>>\n");
3162 shutdown(sx->cctx.sock, SHUT_WR);
3163 if (fcntl(sx->cctx.sock, F_SETFL, O_NONBLOCK) == 0)
3164 for (int i = 16; read(sx->cctx.sock, sx->inbuffer, sizeof(sx->inbuffer)) > 0 && i > 0;)
3165 i--; /* drain socket */
3166 sx->send_quit = FALSE;
3168 (void)close(sx->cctx.sock);
3171 #ifndef DISABLE_EVENT
3172 (void) event_raise(sx->conn_args.tblock->event_action, US"tcp:close", NULL);
3175 continue_transport = NULL;
3176 continue_hostname = NULL;
3183 /* Create the string of options that will be appended to the MAIL FROM:
3184 in the connection context buffer */
3187 build_mailcmd_options(smtp_context * sx, address_item * addrlist)
3189 uschar * p = sx->buffer;
3190 address_item * addr;
3195 /* If we know the receiving MTA supports the SIZE qualification, and we know it,
3196 send it, adding something to the message size to allow for imprecision
3197 and things that get added en route. Exim keeps the number of lines
3198 in a message, so we can give an accurate value for the original message, but we
3199 need some additional to handle added headers. (Double "." characters don't get
3200 included in the count.) */
3202 if ( message_size > 0
3203 && sx->peer_offered & OPTION_SIZE && !(sx->avoid_option & OPTION_SIZE))
3205 /*XXX problem here under spool_files_wireformat?
3206 Or just forget about lines? Or inflate by a fixed proportion? */
3208 sprintf(CS p, " SIZE=%d", message_size+message_linecount+(SOB sx->conn_args.ob)->size_addition);
3212 #ifndef DISABLE_PRDR
3213 /* If it supports Per-Recipient Data Responses, and we have more than one recipient,
3216 sx->prdr_active = FALSE;
3217 if (sx->peer_offered & OPTION_PRDR)
3218 for (address_item * addr = addrlist; addr; addr = addr->next)
3219 if (addr->transport_return == PENDING_DEFER)
3221 for (addr = addr->next; addr; addr = addr->next)
3222 if (addr->transport_return == PENDING_DEFER)
3223 { /* at least two recipients to send */
3224 sx->prdr_active = TRUE;
3225 sprintf(CS p, " PRDR"); p += 5;
3233 /* If it supports internationalised messages, and this meesage need that,
3236 if ( sx->peer_offered & OPTION_UTF8
3237 && addrlist->prop.utf8_msg
3238 && !addrlist->prop.utf8_downcvt
3240 Ustrcpy(p, US" SMTPUTF8"), p += 9;
3243 /* check if all addresses have DSN-lasthop flag; do not send RET and ENVID if so */
3244 for (sx->dsn_all_lasthop = TRUE, addr = addrlist, address_count = 0;
3245 addr && address_count < sx->max_rcpt; /*XXX maybe also || sx->single_rcpt_domain ? */
3246 addr = addr->next) if (addr->transport_return == PENDING_DEFER)
3249 if (!(addr->dsn_flags & rf_dsnlasthop))
3251 sx->dsn_all_lasthop = FALSE;
3256 /* Add any DSN flags to the mail command */
3258 if (sx->peer_offered & OPTION_DSN && !sx->dsn_all_lasthop)
3260 if (dsn_ret == dsn_ret_hdrs)
3261 { Ustrcpy(p, US" RET=HDRS"); p += 9; }
3262 else if (dsn_ret == dsn_ret_full)
3263 { Ustrcpy(p, US" RET=FULL"); p += 9; }
3267 string_format(p, sizeof(sx->buffer) - (p-sx->buffer), " ENVID=%s", dsn_envid);
3272 /* If an authenticated_sender override has been specified for this transport
3273 instance, expand it. If the expansion is forced to fail, and there was already
3274 an authenticated_sender for this message, the original value will be used.
3275 Other expansion failures are serious. An empty result is ignored, but there is
3276 otherwise no check - this feature is expected to be used with LMTP and other
3277 cases where non-standard addresses (e.g. without domains) might be required. */
3279 return smtp_mail_auth_str(sx, p, addrlist) ? ERROR : OK;
3284 build_rcptcmd_options(smtp_context * sx, const address_item * addr)
3286 uschar * p = sx->buffer;
3289 /* Add any DSN flags to the rcpt command */
3291 if (sx->peer_offered & OPTION_DSN && !(addr->dsn_flags & rf_dsnlasthop))
3293 if (addr->dsn_flags & rf_dsnflags)
3297 Ustrcpy(p, US" NOTIFY=");
3299 for (int i = 0; i < nelem(rf_list); i++) if (addr->dsn_flags & rf_list[i])
3301 if (!first) *p++ = ',';
3303 Ustrcpy(p, rf_names[i]);
3308 if (addr->dsn_orcpt)
3310 string_format(p, sizeof(sx->buffer) - (p-sx->buffer), " ORCPT=%s",
3321 0 good, rcpt results in addr->transport_return (PENDING_OK, DEFER, FAIL)
3322 -1 MAIL response error
3323 -2 any non-MAIL read i/o error
3324 -3 non-MAIL response timeout
3325 -4 internal error; channel still usable
3330 smtp_write_mail_and_rcpt_cmds(smtp_context * sx, int * yield)
3332 address_item * addr;
3333 #ifdef EXPERIMENTAL_ESMTP_LIMITS
3334 address_item * restart_addr = NULL;
3336 int address_count, pipe_limit;
3339 if (build_mailcmd_options(sx, sx->first_addr) != OK)
3345 /* From here until we send the DATA command, we can make use of PIPELINING
3346 if the server host supports it. The code has to be able to check the responses
3347 at any point, for when the buffer fills up, so we write it totally generally.
3348 When PIPELINING is off, each command written reports that it has flushed the
3351 sx->pending_MAIL = TRUE; /* The block starts with MAIL */
3354 uschar * s = sx->from_addr;
3356 uschar * errstr = NULL;
3358 /* If we must downconvert, do the from-address here. Remember we had to
3359 for the to-addresses (done below), and also (ugly) for re-doing when building
3360 the delivery log line. */
3362 if ( sx->addrlist->prop.utf8_msg
3363 && (sx->addrlist->prop.utf8_downcvt || !(sx->peer_offered & OPTION_UTF8))
3366 if (s = string_address_utf8_to_alabel(s, &errstr), errstr)
3368 set_errno_nohost(sx->addrlist, ERRNO_EXPANDFAIL, errstr, DEFER, FALSE, &sx->delivery_start);
3372 setflag(sx->addrlist, af_utf8_downcvt);
3376 rc = smtp_write_command(sx, pipelining_active ? SCMD_BUFFER : SCMD_FLUSH,
3377 "MAIL FROM:<%s>%s\r\n", s, sx->buffer);
3380 mail_command = string_copy(big_buffer); /* Save for later error message */
3384 case -1: /* Transmission error */
3387 case +1: /* Cmd was sent */
3388 if (!smtp_read_response(sx, sx->buffer, sizeof(sx->buffer), '2',
3389 (SOB sx->conn_args.ob)->command_timeout))
3391 if (errno == 0 && sx->buffer[0] == '4')
3393 errno = ERRNO_MAIL4XX;
3394 sx->addrlist->more_errno |= ((sx->buffer[1] - '0')*10 + sx->buffer[2] - '0') << 8;
3398 sx->pending_MAIL = FALSE;
3401 /* otherwise zero: command queued for pipeline */
3404 /* Pass over all the relevant recipient addresses for this host, which are the
3405 ones that have status PENDING_DEFER. If we are using PIPELINING, we can send
3406 several before we have to read the responses for those seen so far. This
3407 checking is done by a subroutine because it also needs to be done at the end.
3408 Send only up to max_rcpt addresses at a time, leaving next_addr pointing to
3409 the next one if not all are sent.
3411 In the MUA wrapper situation, we want to flush the PIPELINING buffer for the
3412 last address because we want to abort if any recipients have any kind of
3413 problem, temporary or permanent. We know that all recipient addresses will have
3414 the PENDING_DEFER status, because only one attempt is ever made, and we know
3415 that max_rcpt will be large, so all addresses will be done at once.
3417 For verify we flush the pipeline after any (the only) rcpt address. */
3419 for (addr = sx->first_addr, address_count = 0, pipe_limit = 100;
3420 addr && address_count < sx->max_rcpt;
3421 addr = addr->next) if (addr->transport_return == PENDING_DEFER)
3427 #ifdef EXPERIMENTAL_ESMTP_LIMITS
3428 if ( sx->single_rcpt_domain /* restriction on domains */
3429 && address_count > 0 /* not first being sent */
3430 && Ustrcmp(addr->domain, sx->first_addr->domain) != 0 /* dom diff from first */
3433 DEBUG(D_transport) debug_printf("skipping different domain %s\n", addr->domain);
3435 /* Ensure the smtp-response reaper does not think the address had a RCPT
3436 command sent for it. Reset to PENDING_DEFER in smtp_deliver(), where we
3437 goto SEND_MESSAGE. */
3439 addr->transport_return = SKIP;
3440 if (!restart_addr) restart_addr = addr; /* note restart point */
3441 continue; /* skip this one */
3445 addr->dsn_aware = sx->peer_offered & OPTION_DSN
3446 ? dsn_support_yes : dsn_support_no;
3449 if (pipe_limit-- <= 0)
3450 { no_flush = FALSE; pipe_limit = 100; }
3452 no_flush = pipelining_active && !sx->verify
3453 && (!mua_wrapper || addr->next && address_count < sx->max_rcpt);
3455 build_rcptcmd_options(sx, addr);
3457 /* Now send the RCPT command, and process outstanding responses when
3458 necessary. After a timeout on RCPT, we just end the function, leaving the
3459 yield as OK, because this error can often mean that there is a problem with
3460 just one address, so we don't want to delay the host. */
3462 rcpt_addr = transport_rcpt_address(addr, sx->conn_args.tblock->rcpt_include_affixes);
3465 if ( testflag(sx->addrlist, af_utf8_downcvt)
3466 && !(rcpt_addr = string_address_utf8_to_alabel(rcpt_addr, NULL))
3469 /*XXX could we use a per-address errstr here? Not fail the whole send? */
3470 errno = ERRNO_EXPANDFAIL;
3471 return -5; /*XXX too harsh? */
3475 cmds_sent = smtp_write_command(sx, no_flush ? SCMD_BUFFER : SCMD_FLUSH,
3476 "RCPT TO:<%s>%s%s\r\n", rcpt_addr, sx->igquotstr, sx->buffer);
3478 if (cmds_sent < 0) return -5;
3481 switch(sync_responses(sx, cmds_sent, 0))
3483 case 3: sx->ok = TRUE; /* 2xx & 5xx => OK & progress made */
3484 case 2: sx->completed_addr = TRUE; /* 5xx (only) => progress made */
3487 case 1: sx->ok = TRUE; /* 2xx (only) => OK, but if LMTP, */
3488 if (!sx->lmtp) /* can't tell about progress yet */
3489 sx->completed_addr = TRUE;
3490 case 0: /* No 2xx or 5xx, but no probs */
3491 /* If any RCPT got a 452 response then next_addr has been updated
3492 for restarting with a new MAIL on the same connection. Send no more
3493 RCPTs for this MAIL. */
3497 DEBUG(D_transport) debug_printf("seen 452 too-many-rcpts\n");
3498 sx->RCPT_452 = FALSE;
3499 /* sx->next_addr has been reset for fast_retry */
3504 case -1: return -3; /* Timeout on RCPT */
3505 case -2: return -2; /* non-MAIL read i/o error */
3506 default: return -1; /* any MAIL error */
3508 #ifndef DISABLE_PIPE_CONNECT
3509 case -4: return -1; /* non-2xx for pipelined banner or EHLO */
3510 case -5: return -1; /* TLS first-read error */
3514 } /* Loop for next address */
3516 #ifdef EXPERIMENTAL_ESMTP_LIMITS
3517 sx->next_addr = restart_addr ? restart_addr : addr;
3519 sx->next_addr = addr;
3526 /*****************************************************
3527 * Proxy TLS connection for another transport process *
3528 ******************************************************/
3530 Close the unused end of the pipe, fork once more, then use the given buffer
3531 as a staging area, and select on both the given fd and the TLS'd client-fd for
3532 data to read (per the coding in ip_recv() and fd_ready() this is legitimate).
3533 Do blocking full-size writes, and reads under a timeout. Once both input
3534 channels are closed, exit the process.
3538 buf space to use for buffering
3539 bufsiz size of buffer
3540 pfd pipe filedescriptor array; [0] is comms to proxied process
3541 timeout per-read timeout, seconds
3547 smtp_proxy_tls(void * ct_ctx, uschar * buf, size_t bsize, int * pfd,
3551 int max_fd = MAX(pfd[0], tls_out.active.sock) + 1;
3553 BOOL send_tls_shutdown = TRUE;
3556 if ((rc = exim_fork(US"tls-proxy")))
3557 _exit(rc < 0 ? EXIT_FAILURE : EXIT_SUCCESS);
3559 set_process_info("proxying TLS connection for continued transport");
3561 FD_SET(tls_out.active.sock, &rfds);
3562 FD_SET(pfd[0], &rfds);
3564 for (int fd_bits = 3; fd_bits; )
3566 time_t time_left = timeout;
3567 time_t time_start = time(NULL);
3573 struct timeval tv = { time_left, 0 };
3576 (SELECT_ARG2_TYPE *)&rfds, NULL, (SELECT_ARG2_TYPE *)&efds, &tv);
3578 if (rc < 0 && errno == EINTR)
3579 if ((time_left -= time(NULL) - time_start) > 0) continue;
3583 DEBUG(D_transport) if (rc == 0) debug_printf("%s: timed out\n", __FUNCTION__);
3587 /* For errors where not readable, bomb out */
3589 if (FD_ISSET(tls_out.active.sock, &efds) || FD_ISSET(pfd[0], &efds))
3591 DEBUG(D_transport) debug_printf("select: exceptional cond on %s fd\n",
3592 FD_ISSET(pfd[0], &efds) ? "proxy" : "tls");
3593 if (!(FD_ISSET(tls_out.active.sock, &rfds) || FD_ISSET(pfd[0], &rfds)))
3595 DEBUG(D_transport) debug_printf("- but also readable; no exit yet\n");
3598 while (rc < 0 || !(FD_ISSET(tls_out.active.sock, &rfds) || FD_ISSET(pfd[0], &rfds)));
3600 /* handle inbound data */
3601 if (FD_ISSET(tls_out.active.sock, &rfds))
3602 if ((rc = tls_read(ct_ctx, buf, bsize)) <= 0) /* Expect -1 for EOF; */
3603 { /* that reaps the TLS Close Notify record */
3605 FD_CLR(tls_out.active.sock, &rfds);
3606 shutdown(pfd[0], SHUT_WR);
3611 for (int nbytes = 0; rc - nbytes > 0; nbytes += i)
3612 if ((i = write(pfd[0], buf + nbytes, rc - nbytes)) < 0) goto done;
3615 /* Handle outbound data. We cannot combine payload and the TLS-close
3616 due to the limitations of the (pipe) channel feeding us. */
3617 if (FD_ISSET(pfd[0], &rfds))
3618 if ((rc = read(pfd[0], buf, bsize)) <= 0)
3621 FD_CLR(pfd[0], &rfds);
3623 # ifdef EXIM_TCP_CORK /* Use _CORK to get TLS Close Notify in FIN segment */
3624 (void) setsockopt(tls_out.active.sock, IPPROTO_TCP, EXIM_TCP_CORK, US &on, sizeof(on));
3626 tls_shutdown_wr(ct_ctx);
3627 send_tls_shutdown = FALSE;
3628 shutdown(tls_out.active.sock, SHUT_WR);
3632 for (int nbytes = 0; rc - nbytes > 0; nbytes += i)
3633 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 Cloe 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);
5100 log_write(0, LOG_MAIN|LOG_PANIC,
5101 "attempt to use tainted host list '%s' from '%s' in transport %s",
5102 s, ob->hosts, tblock->name);
5103 /* Avoid leaking info to an attacker */
5104 addrlist->message = US"internal configuration error";
5105 addrlist->transport_return = PANIC;
5109 host_build_hostlist(&hostlist, s, ob->hosts_randomize);
5111 /* Check that the expansion yielded something useful. */
5115 string_sprintf("%s transport has empty hosts setting", tblock->name);
5116 addrlist->transport_return = PANIC;
5117 return FALSE; /* Only top address has status */
5120 /* If there was no expansion of hosts, save the host list for
5123 if (!expanded_hosts) ob->hostlist = hostlist;
5126 /* This is not the first time this transport has been run in this delivery;
5127 the host list was built previously. */
5130 hostlist = ob->hostlist;
5133 /* The host list was supplied with the address. If hosts_randomize is set, we
5134 must sort it into a random order if it did not come from MX records and has not
5135 already been randomized (but don't bother if continuing down an existing
5138 else if (ob->hosts_randomize && hostlist->mx == MX_NONE && !continue_hostname)
5140 host_item *newlist = NULL;
5143 host_item *h = hostlist;
5144 hostlist = hostlist->next;
5146 h->sort_key = random_number(100);
5153 else if (h->sort_key < newlist->sort_key)
5160 host_item *hh = newlist;
5163 if (h->sort_key < hh->next->sort_key) break;
5171 hostlist = addrlist->host_list = newlist;
5174 /* Sort out the default port. */
5176 if (!smtp_get_port(ob->port, addrlist, &defport, tid)) return FALSE;
5178 /* For each host-plus-IP-address on the list:
5180 . If this is a continued delivery and the host isn't the one with the
5181 current connection, skip.
5183 . If the status is unusable (i.e. previously failed or retry checked), skip.
5185 . If no IP address set, get the address, either by turning the name into
5186 an address, calling gethostbyname if gethostbyname is on, or by calling
5187 the DNS. The DNS may yield multiple addresses, in which case insert the
5188 extra ones into the list.
5190 . Get the retry data if not previously obtained for this address and set the
5191 field which remembers the state of this address. Skip if the retry time is
5192 not reached. If not, remember whether retry data was found. The retry string
5193 contains both the name and the IP address.
5195 . Scan the list of addresses and mark those whose status is DEFER as
5196 PENDING_DEFER. These are the only ones that will be processed in this cycle
5199 . Make a delivery attempt - addresses marked PENDING_DEFER will be tried.
5200 Some addresses may be successfully delivered, others may fail, and yet
5201 others may get temporary errors and so get marked DEFER.
5203 . The return from the delivery attempt is OK if a connection was made and a
5204 valid SMTP dialogue was completed. Otherwise it is DEFER.
5206 . If OK, add a "remove" retry item for this host/IPaddress, if any.
5208 . If fail to connect, or other defer state, add a retry item.
5210 . If there are any addresses whose status is still DEFER, carry on to the
5211 next host/IPaddress, unless we have tried the number of hosts given
5212 by hosts_max_try or hosts_max_try_hardlimit; otherwise return. Note that
5213 there is some fancy logic for hosts_max_try that means its limit can be
5214 overstepped in some circumstances.
5216 If we get to the end of the list, all hosts have deferred at least one address,
5217 or not reached their retry times. If delay_after_cutoff is unset, it requests a
5218 delivery attempt to those hosts whose last try was before the arrival time of
5219 the current message. To cope with this, we have to go round the loop a second
5220 time. After that, set the status and error data for any addresses that haven't
5221 had it set already. */
5223 for (int cutoff_retry = 0;
5224 expired && cutoff_retry < (ob->delay_after_cutoff ? 1 : 2);
5227 host_item *nexthost = NULL;
5228 int unexpired_hosts_tried = 0;
5229 BOOL continue_host_tried = FALSE;
5231 retry_non_continued:
5232 for (host = hostlist;
5234 && unexpired_hosts_tried < ob->hosts_max_try
5235 && total_hosts_tried < ob->hosts_max_try_hardlimit;
5240 BOOL host_is_expired = FALSE;
5241 BOOL message_defer = FALSE;
5242 BOOL some_deferred = FALSE;
5243 address_item *first_addr = NULL;
5244 uschar *interface = NULL;
5245 uschar *retry_host_key = NULL;
5246 uschar *retry_message_key = NULL;
5247 uschar *serialize_key = NULL;
5249 /* Default next host is next host. :-) But this can vary if the
5250 hosts_max_try limit is hit (see below). It may also be reset if a host
5251 address is looked up here (in case the host was multihomed). */
5253 nexthost = host->next;
5255 /* If the address hasn't yet been obtained from the host name, look it up
5256 now, unless the host is already marked as unusable. If it is marked as
5257 unusable, it means that the router was unable to find its IP address (in
5258 the DNS or wherever) OR we are in the 2nd time round the cutoff loop, and
5259 the lookup failed last time. We don't get this far if *all* MX records
5260 point to non-existent hosts; that is treated as a hard error.
5262 We can just skip this host entirely. When the hosts came from the router,
5263 the address will timeout based on the other host(s); when the address is
5264 looked up below, there is an explicit retry record added.
5266 Note that we mustn't skip unusable hosts if the address is not unset; they
5267 may be needed as expired hosts on the 2nd time round the cutoff loop. */
5271 int new_port, flags;
5273 if (host->status >= hstatus_unusable)
5275 DEBUG(D_transport) debug_printf("%s has no address and is unusable - skipping\n",
5280 DEBUG(D_transport) debug_printf("getting address for %s\n", host->name);
5282 /* The host name is permitted to have an attached port. Find it, and
5283 strip it from the name. Just remember it for now. */
5285 new_port = host_item_get_port(host);
5287 /* Count hosts looked up */
5291 /* Find by name if so configured, or if it's an IP address. We don't
5292 just copy the IP address, because we need the test-for-local to happen. */
5294 flags = HOST_FIND_BY_A | HOST_FIND_BY_AAAA;
5295 if (ob->dns_qualify_single) flags |= HOST_FIND_QUALIFY_SINGLE;
5296 if (ob->dns_search_parents) flags |= HOST_FIND_SEARCH_PARENTS;
5298 if (ob->gethostbyname || string_is_ip_address(host->name, NULL) != 0)
5299 rc = host_find_byname(host, NULL, flags, NULL, TRUE);
5301 rc = host_find_bydns(host, NULL, flags, NULL, NULL, NULL,
5302 &ob->dnssec, /* domains for request/require */
5305 /* Update the host (and any additional blocks, resulting from
5306 multihoming) with a host-specific port, if any. */
5308 for (host_item * hh = host; hh != nexthost; hh = hh->next) hh->port = new_port;
5310 /* Failure to find the host at this time (usually DNS temporary failure)
5311 is really a kind of routing failure rather than a transport failure.
5312 Therefore we add a retry item of the routing kind, not to stop us trying
5313 to look this name up here again, but to ensure the address gets timed
5314 out if the failures go on long enough. A complete failure at this point
5315 commonly points to a configuration error, but the best action is still
5316 to carry on for the next host. */
5318 if (rc == HOST_FIND_AGAIN || rc == HOST_FIND_SECURITY || rc == HOST_FIND_FAILED)
5320 retry_add_item(addrlist, string_sprintf("R:%s", host->name), 0);
5322 if (rc == HOST_FIND_AGAIN) hosts_defer++; else hosts_fail++;
5323 DEBUG(D_transport) debug_printf("rc = %s for %s\n", (rc == HOST_FIND_AGAIN)?
5324 "HOST_FIND_AGAIN" : "HOST_FIND_FAILED", host->name);
5325 host->status = hstatus_unusable;
5327 for (address_item * addr = addrlist; addr; addr = addr->next)
5329 if (addr->transport_return != DEFER) continue;
5330 addr->basic_errno = ERRNO_UNKNOWNHOST;
5331 addr->message = string_sprintf(
5332 rc == HOST_FIND_SECURITY
5333 ? "lookup of IP address for %s was insecure"
5334 : "failed to lookup IP address for %s",
5340 /* If the host is actually the local host, we may have a problem, or
5341 there may be some cunning configuration going on. In the problem case,
5342 log things and give up. The default transport status is already DEFER. */
5344 if (rc == HOST_FOUND_LOCAL && !ob->allow_localhost)
5346 for (address_item * addr = addrlist; addr; addr = addr->next)
5348 addr->basic_errno = ERRNO_HOST_IS_LOCAL;
5349 addr->message = string_sprintf("%s transport found host %s to be "
5350 "local", tblock->name, host->name);
5354 } /* End of block for IP address lookup */
5356 /* If this is a continued delivery, we are interested only in the host
5357 which matches the name of the existing open channel. The check is put
5358 here after the local host lookup, in case the name gets expanded as a
5359 result of the lookup. Set expired FALSE, to save the outer loop executing
5362 if (continue_hostname)
5363 if ( Ustrcmp(continue_hostname, host->name) != 0
5364 || Ustrcmp(continue_host_address, host->address) != 0
5368 continue; /* With next host */
5371 continue_host_tried = TRUE;
5373 /* Reset the default next host in case a multihomed host whose addresses
5374 are not looked up till just above added to the host list. */
5376 nexthost = host->next;
5378 /* If queue_smtp is set (-odqs or the first part of a 2-stage run), or the
5379 domain is in queue_smtp_domains, we don't actually want to attempt any
5380 deliveries. When doing a queue run, queue_smtp_domains is always unset. If
5381 there is a lookup defer in queue_smtp_domains, proceed as if the domain
5382 were not in it. We don't want to hold up all SMTP deliveries! Except when
5383 doing a two-stage queue run, don't do this if forcing. */
5385 if ( (!f.deliver_force || f.queue_2stage)
5387 || match_isinlist(addrlist->domain,
5388 CUSS &queue_smtp_domains, 0,
5389 &domainlist_anchor, NULL, MCL_DOMAIN, TRUE, NULL) == OK)
5392 DEBUG(D_transport) debug_printf("first-pass routing only\n");
5394 for (address_item * addr = addrlist; addr; addr = addr->next)
5395 if (addr->transport_return == DEFER)
5396 addr->message = US"first-pass only routing due to -odqs, "
5397 "queue_smtp_domains or control=queue";
5398 continue; /* With next host */
5401 /* Count hosts being considered - purely for an intelligent comment
5402 if none are usable. */
5406 /* Set $host and $host address now in case they are needed for the
5407 interface expansion or the serialize_hosts check; they remain set if an
5408 actual delivery happens. */
5410 deliver_host = host->name;
5411 deliver_host_address = host->address;
5412 lookup_dnssec_authenticated = host->dnssec == DS_YES ? US"yes"
5413 : host->dnssec == DS_NO ? US"no"
5416 /* Set up a string for adding to the retry key if the port number is not
5417 the standard SMTP port. A host may have its own port setting that overrides
5420 pistring = string_sprintf(":%d", host->port == PORT_NONE
5421 ? defport : host->port);
5422 if (Ustrcmp(pistring, ":25") == 0) pistring = US"";
5424 /* Select IPv4 or IPv6, and choose an outgoing interface. If the interface
5425 string is set, even if constant (as different transports can have different
5426 constant settings), we must add it to the key that is used for retries,
5427 because connections to the same host from a different interface should be
5428 treated separately. */
5430 host_af = Ustrchr(host->address, ':') ? AF_INET6 : AF_INET;
5432 uschar * s = ob->interface;
5435 if (!smtp_get_interface(s, host_af, addrlist, &interface, tid))
5437 pistring = string_sprintf("%s/%s", pistring, interface);
5441 /* The first time round the outer loop, check the status of the host by
5442 inspecting the retry data. The second time round, we are interested only
5443 in expired hosts that haven't been tried since this message arrived. */
5445 if (cutoff_retry == 0)
5448 /* Ensure the status of the address is set by checking retry data if
5449 necessary. There may be host-specific retry data (applicable to all
5450 messages) and also data for retries of a specific message at this host.
5451 If either of these retry records are actually read, the keys used are
5452 returned to save recomputing them later. */
5454 if (exp_bool(addrlist, US"transport", tblock->name, D_transport,
5455 US"retry_include_ip_address", ob->retry_include_ip_address,
5456 ob->expand_retry_include_ip_address, &incl_ip) != OK)
5457 continue; /* with next host */
5459 host_is_expired = retry_check_address(addrlist->domain, host, pistring,
5460 incl_ip, &retry_host_key, &retry_message_key);
5462 DEBUG(D_transport) debug_printf("%s [%s]%s retry-status = %s\n", host->name,
5463 host->address ? host->address : US"", pistring,
5464 host->status == hstatus_usable ? "usable"
5465 : host->status == hstatus_unusable ? "unusable"
5466 : host->status == hstatus_unusable_expired ? "unusable (expired)" : "?");
5468 /* Skip this address if not usable at this time, noting if it wasn't
5469 actually expired, both locally and in the address. */
5471 switch (host->status)
5473 case hstatus_unusable:
5475 setflag(addrlist, af_retry_skipped);
5478 case hstatus_unusable_expired:
5481 case hwhy_retry: hosts_retry++; break;
5482 case hwhy_failed: hosts_fail++; break;
5484 case hwhy_deferred: hosts_defer++; break;
5487 /* If there was a retry message key, implying that previously there
5488 was a message-specific defer, we don't want to update the list of
5489 messages waiting for these hosts. */
5491 if (retry_message_key) update_waiting = FALSE;
5492 continue; /* With the next host or IP address */
5496 /* Second time round the loop: if the address is set but expired, and
5497 the message is newer than the last try, let it through. */
5502 || host->status != hstatus_unusable_expired
5503 || host->last_try > received_time.tv_sec)
5505 DEBUG(D_transport) debug_printf("trying expired host %s [%s]%s\n",
5506 host->name, host->address, pistring);
5507 host_is_expired = TRUE;
5510 /* Setting "expired=FALSE" doesn't actually mean not all hosts are expired;
5511 it remains TRUE only if all hosts are expired and none are actually tried.
5516 /* If this host is listed as one to which access must be serialized,
5517 see if another Exim process has a connection to it, and if so, skip
5518 this host. If not, update the database to record our connection to it
5519 and remember this for later deletion. Do not do any of this if we are
5520 sending the message down a pre-existing connection. */
5522 if ( !continue_hostname
5523 && verify_check_given_host(CUSS &ob->serialize_hosts, host) == OK)
5525 serialize_key = string_sprintf("host-serialize-%s", host->name);
5526 if (!enq_start(serialize_key, 1))
5529 debug_printf("skipping host %s because another Exim process "
5530 "is connected to it\n", host->name);
5536 /* OK, we have an IP address that is not waiting for its retry time to
5537 arrive (it might be expired) OR (second time round the loop) we have an
5538 expired host that hasn't been tried since the message arrived. Have a go
5539 at delivering the message to it. First prepare the addresses by flushing
5540 out the result of previous attempts, and finding the first address that
5541 is still to be delivered. */
5543 first_addr = prepare_addresses(addrlist, host);
5545 DEBUG(D_transport) debug_printf("delivering %s to %s [%s] (%s%s)\n",
5546 message_id, host->name, host->address, addrlist->address,
5547 addrlist->next ? ", ..." : "");
5549 set_process_info("delivering %s to %s [%s]%s (%s%s)",
5550 message_id, host->name, host->address, pistring, addrlist->address,
5551 addrlist->next ? ", ..." : "");
5553 /* This is not for real; don't do the delivery. If there are
5554 any remaining hosts, list them. */
5559 gettimeofday(&now, NULL);
5560 set_errno_nohost(addrlist, 0, NULL, OK, FALSE, &now);
5561 for (address_item * addr = addrlist; addr; addr = addr->next)
5563 addr->host_used = host;
5564 addr->special_action = '*';
5565 addr->message = US"delivery bypassed by -N option";
5569 debug_printf("*** delivery by %s transport bypassed by -N option\n"
5570 "*** host and remaining hosts:\n", tblock->name);
5571 for (host_item * host2 = host; host2; host2 = host2->next)
5572 debug_printf(" %s [%s]\n", host2->name,
5573 host2->address ? host2->address : US"unset");
5578 /* This is for real. If the host is expired, we don't count it for
5579 hosts_max_retry. This ensures that all hosts must expire before an address
5580 is timed out, unless hosts_max_try_hardlimit (which protects against
5581 lunatic DNS configurations) is reached.
5583 If the host is not expired and we are about to hit the hosts_max_retry
5584 limit, check to see if there is a subsequent hosts with a different MX
5585 value. If so, make that the next host, and don't count this one. This is a
5586 heuristic to make sure that different MXs do get tried. With a normal kind
5587 of retry rule, they would get tried anyway when the earlier hosts were
5588 delayed, but if the domain has a "retry every time" type of rule - as is
5589 often used for the the very large ISPs, that won't happen. */
5594 /* Make a copy of the host if it is local to this invocation
5595 of the transport. */
5599 thost = store_get(sizeof(host_item), FALSE);
5601 thost->name = string_copy(host->name);
5602 thost->address = string_copy(host->address);
5607 if (!host_is_expired && ++unexpired_hosts_tried >= ob->hosts_max_try)
5610 debug_printf("hosts_max_try limit reached with this host\n");
5611 for (host_item * h = host; h; h = h->next) if (h->mx != host->mx)
5614 unexpired_hosts_tried--;
5615 DEBUG(D_transport) debug_printf("however, a higher MX host exists "
5616 "and will be tried\n");
5621 /* Attempt the delivery. */
5623 total_hosts_tried++;
5624 rc = smtp_deliver(addrlist, thost, host_af, defport, interface, tblock,
5625 &message_defer, FALSE);
5628 OK => connection made, each address contains its result;
5629 message_defer is set for message-specific defers (when all
5630 recipients are marked defer)
5631 DEFER => there was a non-message-specific delivery problem;
5632 ERROR => there was a problem setting up the arguments for a filter,
5633 or there was a problem with expanding added headers
5636 /* If the result is not OK, there was a non-message-specific problem.
5637 If the result is DEFER, we need to write to the logs saying what happened
5638 for this particular host, except in the case of authentication and TLS
5639 failures, where the log has already been written. If all hosts defer a
5640 general message is written at the end. */
5642 if (rc == DEFER && first_addr->basic_errno != ERRNO_AUTHFAIL
5643 && first_addr->basic_errno != ERRNO_TLSFAILURE)
5644 write_logs(host, first_addr->message, first_addr->basic_errno);
5646 #ifndef DISABLE_EVENT
5648 deferred_event_raise(first_addr, host, US"msg:host:defer");
5651 /* If STARTTLS was accepted, but there was a failure in setting up the
5652 TLS session (usually a certificate screwup), and the host is not in
5653 hosts_require_tls, and tls_tempfail_tryclear is true, try again, with
5654 TLS forcibly turned off. We have to start from scratch with a new SMTP
5655 connection. That's why the retry is done from here, not from within
5656 smtp_deliver(). [Rejections of STARTTLS itself don't screw up the
5657 session, so the in-clear transmission after those errors, if permitted,
5658 happens inside smtp_deliver().] */
5662 && first_addr->basic_errno == ERRNO_TLSFAILURE
5663 && ob->tls_tempfail_tryclear
5664 && verify_check_given_host(CUSS &ob->hosts_require_tls, host) != OK
5667 log_write(0, LOG_MAIN,
5668 "%s: delivering unencrypted to H=%s [%s] (not in hosts_require_tls)",
5669 first_addr->message, host->name, host->address);
5670 first_addr = prepare_addresses(addrlist, host);
5671 rc = smtp_deliver(addrlist, thost, host_af, defport, interface, tblock,
5672 &message_defer, TRUE);
5673 if (rc == DEFER && first_addr->basic_errno != ERRNO_AUTHFAIL)
5674 write_logs(host, first_addr->message, first_addr->basic_errno);
5675 # ifndef DISABLE_EVENT
5677 deferred_event_raise(first_addr, host, US"msg:host:defer");
5680 #endif /*DISABLE_TLS*/
5682 #ifndef DISABLE_EVENT
5683 /* If the last host gave a defer raise a per-message event */
5686 && unexpired_hosts_tried < ob->hosts_max_try
5687 && total_hosts_tried < ob->hosts_max_try_hardlimit
5689 && (message_defer || rc == DEFER)
5691 deferred_event_raise(first_addr, host, US"msg:defer");
5695 /* Delivery attempt finished */
5697 set_process_info("delivering %s: just tried %s [%s]%s for %s%s: result %s",
5698 message_id, host->name, host->address, pistring, addrlist->address,
5699 addrlist->next ? " (& others)" : "", rc_to_string(rc));
5701 /* Release serialization if set up */
5703 if (serialize_key) enq_end(serialize_key);
5705 /* If the result is DEFER, or if a host retry record is known to exist, we
5706 need to add an item to the retry chain for updating the retry database
5707 at the end of delivery. We only need to add the item to the top address,
5708 of course. Also, if DEFER, we mark the IP address unusable so as to skip it
5709 for any other delivery attempts using the same address. (It is copied into
5710 the unusable tree at the outer level, so even if different address blocks
5711 contain the same address, it still won't get tried again.) */
5713 if (rc == DEFER || retry_host_key)
5715 int delete_flag = rc != DEFER ? rf_delete : 0;
5716 if (!retry_host_key)
5719 if (exp_bool(addrlist, US"transport", tblock->name, D_transport,
5720 US"retry_include_ip_address", ob->retry_include_ip_address,
5721 ob->expand_retry_include_ip_address, &incl_ip) != OK)
5722 incl_ip = TRUE; /* error; use most-specific retry record */
5724 retry_host_key = incl_ip
5725 ? string_sprintf("T:%S:%s%s", host->name, host->address, pistring)
5726 : string_sprintf("T:%S%s", host->name, pistring);
5729 /* If a delivery of another message over an existing SMTP connection
5730 yields DEFER, we do NOT set up retry data for the host. This covers the
5731 case when there are delays in routing the addresses in the second message
5732 that are so long that the server times out. This is alleviated by not
5733 routing addresses that previously had routing defers when handling an
5734 existing connection, but even so, this case may occur (e.g. if a
5735 previously happily routed address starts giving routing defers). If the
5736 host is genuinely down, another non-continued message delivery will
5737 notice it soon enough. */
5739 if (delete_flag != 0 || !continue_hostname)
5740 retry_add_item(first_addr, retry_host_key, rf_host | delete_flag);
5742 /* We may have tried an expired host, if its retry time has come; ensure
5743 the status reflects the expiry for the benefit of any other addresses. */
5747 host->status = host_is_expired
5748 ? hstatus_unusable_expired : hstatus_unusable;
5749 host->why = hwhy_deferred;
5753 /* If message_defer is set (host was OK, but every recipient got deferred
5754 because of some message-specific problem), or if that had happened
5755 previously so that a message retry key exists, add an appropriate item
5756 to the retry chain. Note that if there was a message defer but now there is
5757 a host defer, the message defer record gets deleted. That seems perfectly
5758 reasonable. Also, stop the message from being remembered as waiting
5759 for specific hosts. */
5761 if (message_defer || retry_message_key)
5763 int delete_flag = message_defer ? 0 : rf_delete;
5764 if (!retry_message_key)
5767 if (exp_bool(addrlist, US"transport", tblock->name, D_transport,
5768 US"retry_include_ip_address", ob->retry_include_ip_address,
5769 ob->expand_retry_include_ip_address, &incl_ip) != OK)
5770 incl_ip = TRUE; /* error; use most-specific retry record */
5772 retry_message_key = incl_ip
5773 ? string_sprintf("T:%S:%s%s:%s", host->name, host->address, pistring,
5775 : string_sprintf("T:%S%s:%s", host->name, pistring, message_id);
5777 retry_add_item(addrlist, retry_message_key,
5778 rf_message | rf_host | delete_flag);
5779 update_waiting = FALSE;
5782 /* Any return other than DEFER (that is, OK or ERROR) means that the
5783 addresses have got their final statuses filled in for this host. In the OK
5784 case, see if any of them are deferred. */
5787 for (address_item * addr = addrlist; addr; addr = addr->next)
5788 if (addr->transport_return == DEFER)
5790 some_deferred = TRUE;
5794 /* If no addresses deferred or the result was ERROR, return. We do this for
5795 ERROR because a failing filter set-up or add_headers expansion is likely to
5796 fail for any host we try. */
5798 if (rc == ERROR || (rc == OK && !some_deferred))
5800 DEBUG(D_transport) debug_printf("Leaving %s transport\n", tblock->name);
5801 return TRUE; /* Each address has its status */
5804 /* If the result was DEFER or some individual addresses deferred, let
5805 the loop run to try other hosts with the deferred addresses, except for the
5806 case when we were trying to deliver down an existing channel and failed.
5807 Don't try any other hosts in this case. */
5809 if (continue_hostname) break;
5811 /* If the whole delivery, or some individual addresses, were deferred and
5812 there are more hosts that could be tried, do not count this host towards
5813 the hosts_max_try limit if the age of the message is greater than the
5814 maximum retry time for this host. This means we may try try all hosts,
5815 ignoring the limit, when messages have been around for some time. This is
5816 important because if we don't try all hosts, the address will never time
5817 out. NOTE: this does not apply to hosts_max_try_hardlimit. */
5819 if ((rc == DEFER || some_deferred) && nexthost)
5822 retry_config *retry = retry_find_config(host->name, NULL, 0, 0);
5824 if (retry && retry->rules)
5826 retry_rule *last_rule;
5827 for (last_rule = retry->rules;
5829 last_rule = last_rule->next);
5830 timedout = time(NULL) - received_time.tv_sec > last_rule->timeout;
5832 else timedout = TRUE; /* No rule => timed out */
5836 unexpired_hosts_tried--;
5837 DEBUG(D_transport) debug_printf("temporary delivery error(s) override "
5838 "hosts_max_try (message older than host's retry time)\n");
5844 if (unexpired_hosts_tried >= ob->hosts_max_try)
5845 debug_printf("reached transport hosts_max_try limit %d\n",
5847 if (total_hosts_tried >= ob->hosts_max_try_hardlimit)
5848 debug_printf("reached transport hosts_max_try_hardlimit limit %d\n",
5849 ob->hosts_max_try_hardlimit);
5852 testharness_pause_ms(500); /* let server debug out */
5853 } /* End of loop for trying multiple hosts. */
5855 /* If we failed to find a matching host in the list, for an already-open
5856 connection, just close it and start over with the list. This can happen
5857 for routing that changes from run to run, or big multi-IP sites with
5860 if (continue_hostname && !continue_host_tried)
5862 int fd = cutthrough.cctx.sock >= 0 ? cutthrough.cctx.sock : 0;
5864 DEBUG(D_transport) debug_printf("no hosts match already-open connection\n");
5866 /* A TLS conn could be open for a cutthrough, but not for a plain continued-
5868 /*XXX doublecheck that! */
5870 if (cutthrough.cctx.sock >= 0 && cutthrough.is_tls)
5872 (void) tls_write(cutthrough.cctx.tls_ctx, US"QUIT\r\n", 6, FALSE);
5873 tls_close(cutthrough.cctx.tls_ctx, TLS_SHUTDOWN_NOWAIT);
5874 cutthrough.cctx.tls_ctx = NULL;
5875 cutthrough.is_tls = FALSE;
5879 (void) write(fd, US"QUIT\r\n", 6);
5882 cutthrough.cctx.sock = -1;
5883 continue_hostname = NULL;
5884 goto retry_non_continued;
5887 /* This is the end of the loop that repeats iff expired is TRUE and
5888 ob->delay_after_cutoff is FALSE. The second time round we will
5889 try those hosts that haven't been tried since the message arrived. */
5893 debug_printf("all IP addresses skipped or deferred at least one address\n");
5894 if (expired && !ob->delay_after_cutoff && cutoff_retry == 0)
5895 debug_printf("retrying IP addresses not tried since message arrived\n");
5900 /* Get here if all IP addresses are skipped or defer at least one address. In
5901 MUA wrapper mode, this will happen only for connection or other non-message-
5902 specific failures. Force the delivery status for all addresses to FAIL. */
5906 for (address_item * addr = addrlist; addr; addr = addr->next)
5907 addr->transport_return = FAIL;
5911 /* In the normal, non-wrapper case, add a standard message to each deferred
5912 address if there hasn't been an error, that is, if it hasn't actually been
5913 tried this time. The variable "expired" will be FALSE if any deliveries were
5914 actually tried, or if there was at least one host that was not expired. That
5915 is, it is TRUE only if no deliveries were tried and all hosts were expired. If
5916 a delivery has been tried, an error code will be set, and the failing of the
5917 message is handled by the retry code later.
5919 If queue_smtp is set, or this transport was called to send a subsequent message
5920 down an existing TCP/IP connection, and something caused the host not to be
5921 found, we end up here, but can detect these cases and handle them specially. */
5923 for (address_item * addr = addrlist; addr; addr = addr->next)
5925 /* If host is not NULL, it means that we stopped processing the host list
5926 because of hosts_max_try or hosts_max_try_hardlimit. In the former case, this
5927 means we need to behave as if some hosts were skipped because their retry
5928 time had not come. Specifically, this prevents the address from timing out.
5929 However, if we have hit hosts_max_try_hardlimit, we want to behave as if all
5930 hosts were tried. */
5933 if (total_hosts_tried >= ob->hosts_max_try_hardlimit)
5936 debug_printf("hosts_max_try_hardlimit reached: behave as if all "
5937 "hosts were tried\n");
5942 debug_printf("hosts_max_try limit caused some hosts to be skipped\n");
5943 setflag(addr, af_retry_skipped);
5946 if (f.queue_smtp) /* no deliveries attempted */
5948 addr->transport_return = DEFER;
5949 addr->basic_errno = 0;
5950 addr->message = US"SMTP delivery explicitly queued";
5953 else if ( addr->transport_return == DEFER
5954 && (addr->basic_errno == ERRNO_UNKNOWNERROR || addr->basic_errno == 0)
5958 addr->basic_errno = ERRNO_HRETRY;
5959 if (continue_hostname)
5960 addr->message = US"no host found for existing SMTP connection";
5963 setflag(addr, af_pass_message); /* This is not a security risk */
5964 addr->message = string_sprintf(
5965 "all hosts%s have been failing for a long time %s",
5966 addr->domain ? string_sprintf(" for '%s'", addr->domain) : US"",
5967 ob->delay_after_cutoff
5968 ? US"(and retry time not reached)"
5969 : US"and were last tried after this message arrived");
5971 /* If we are already using fallback hosts, or there are no fallback hosts
5972 defined, convert the result to FAIL to cause a bounce. */
5974 if (addr->host_list == addr->fallback_hosts || !addr->fallback_hosts)
5975 addr->transport_return = FAIL;
5980 if (hosts_retry == hosts_total)
5981 s = "retry time not reached for any host%s";
5982 else if (hosts_fail == hosts_total)
5983 s = "all host address lookups%s failed permanently";
5984 else if (hosts_defer == hosts_total)
5985 s = "all host address lookups%s failed temporarily";
5986 else if (hosts_serial == hosts_total)
5987 s = "connection limit reached for all hosts%s";
5988 else if (hosts_fail+hosts_defer == hosts_total)
5989 s = "all host address lookups%s failed";
5991 s = "some host address lookups failed and retry time "
5992 "not reached for other hosts or connection limit reached%s";
5994 addr->message = string_sprintf(s,
5995 addr->domain ? string_sprintf(" for '%s'", addr->domain) : US"");
6000 /* Update the database which keeps information about which messages are waiting
6001 for which hosts to become available. For some message-specific errors, the
6002 update_waiting flag is turned off because we don't want follow-on deliveries in
6003 those cases. If this transport instance is explicitly limited to one message
6004 per connection then follow-on deliveries are not possible and there's no need
6005 to create/update the per-transport wait-<transport_name> database. */
6007 if (update_waiting && tblock->connection_max_messages != 1)
6008 transport_update_waiting(hostlist, tblock->name);
6012 DEBUG(D_transport) debug_printf("Leaving %s transport\n", tblock->name);
6014 return TRUE; /* Each address has its status */
6017 #endif /*!MACRO_PREDEF*/
6020 /* End of transport/smtp.c */