1 /*************************************************
2 * Exim - an Internet mail transport agent *
3 *************************************************/
5 /* Copyright (c) University of Cambridge 1995 - 2018 */
6 /* See the file NOTICE for conditions of use and distribution. */
11 #if defined(SUPPORT_DANE) && defined(DISABLE_TLS)
12 # error TLS is required for DANE
16 /* Options specific to the smtp transport. This transport also supports LMTP
17 over TCP/IP. The options must be in alphabetic order (note that "_" comes
18 before the lower case letters). Some live in the transport_instance block so as
19 to be publicly visible; these are flagged with opt_public. */
21 #define LOFF(field) OPT_OFF(smtp_transport_options_block, field)
23 optionlist smtp_transport_options[] = {
24 { "*expand_multi_domain", opt_stringptr | opt_hidden | opt_public,
25 OPT_OFF(transport_instance, expand_multi_domain) },
26 { "*expand_retry_include_ip_address", opt_stringptr | opt_hidden,
27 LOFF(expand_retry_include_ip_address) },
29 { "address_retry_include_sender", opt_bool,
30 LOFF(address_retry_include_sender) },
31 { "allow_localhost", opt_bool, LOFF(allow_localhost) },
32 #ifdef EXPERIMENTAL_ARC
33 { "arc_sign", opt_stringptr, LOFF(arc_sign) },
35 { "authenticated_sender", opt_stringptr, LOFF(authenticated_sender) },
36 { "authenticated_sender_force", opt_bool, LOFF(authenticated_sender_force) },
37 { "command_timeout", opt_time, LOFF(command_timeout) },
38 { "connect_timeout", opt_time, LOFF(connect_timeout) },
39 { "connection_max_messages", opt_int | opt_public,
40 OPT_OFF(transport_instance, connection_max_messages) },
42 { "dane_require_tls_ciphers", opt_stringptr, LOFF(dane_require_tls_ciphers) },
44 { "data_timeout", opt_time, LOFF(data_timeout) },
45 { "delay_after_cutoff", opt_bool, LOFF(delay_after_cutoff) },
47 { "dkim_canon", opt_stringptr, LOFF(dkim.dkim_canon) },
48 { "dkim_domain", opt_stringptr, LOFF(dkim.dkim_domain) },
49 { "dkim_hash", opt_stringptr, LOFF(dkim.dkim_hash) },
50 { "dkim_identity", opt_stringptr, LOFF(dkim.dkim_identity) },
51 { "dkim_private_key", opt_stringptr, LOFF(dkim.dkim_private_key) },
52 { "dkim_selector", opt_stringptr, LOFF(dkim.dkim_selector) },
53 { "dkim_sign_headers", opt_stringptr, LOFF(dkim.dkim_sign_headers) },
54 { "dkim_strict", opt_stringptr, LOFF(dkim.dkim_strict) },
55 { "dkim_timestamps", opt_stringptr, LOFF(dkim.dkim_timestamps) },
57 { "dns_qualify_single", opt_bool, LOFF(dns_qualify_single) },
58 { "dns_search_parents", opt_bool, LOFF(dns_search_parents) },
59 { "dnssec_request_domains", opt_stringptr, LOFF(dnssec.request) },
60 { "dnssec_require_domains", opt_stringptr, LOFF(dnssec.require) },
61 { "dscp", opt_stringptr, LOFF(dscp) },
62 { "fallback_hosts", opt_stringptr, LOFF(fallback_hosts) },
63 { "final_timeout", opt_time, LOFF(final_timeout) },
64 { "gethostbyname", opt_bool, LOFF(gethostbyname) },
65 { "helo_data", opt_stringptr, LOFF(helo_data) },
66 { "hosts", opt_stringptr, LOFF(hosts) },
67 { "hosts_avoid_esmtp", opt_stringptr, LOFF(hosts_avoid_esmtp) },
68 { "hosts_avoid_pipelining", opt_stringptr, LOFF(hosts_avoid_pipelining) },
70 { "hosts_avoid_tls", opt_stringptr, LOFF(hosts_avoid_tls) },
72 { "hosts_max_try", opt_int, LOFF(hosts_max_try) },
73 { "hosts_max_try_hardlimit", opt_int, LOFF(hosts_max_try_hardlimit) },
75 { "hosts_nopass_tls", opt_stringptr, LOFF(hosts_nopass_tls) },
76 { "hosts_noproxy_tls", opt_stringptr, LOFF(hosts_noproxy_tls) },
78 { "hosts_override", opt_bool, LOFF(hosts_override) },
79 #ifndef DISABLE_PIPE_CONNECT
80 { "hosts_pipe_connect", opt_stringptr, LOFF(hosts_pipe_connect) },
82 { "hosts_randomize", opt_bool, LOFF(hosts_randomize) },
83 #if !defined(DISABLE_TLS) && !defined(DISABLE_OCSP)
84 { "hosts_request_ocsp", opt_stringptr, LOFF(hosts_request_ocsp) },
86 { "hosts_require_auth", opt_stringptr, LOFF(hosts_require_auth) },
89 { "hosts_require_dane", opt_stringptr, LOFF(hosts_require_dane) },
92 { "hosts_require_ocsp", opt_stringptr, LOFF(hosts_require_ocsp) },
94 { "hosts_require_tls", opt_stringptr, LOFF(hosts_require_tls) },
96 { "hosts_try_auth", opt_stringptr, LOFF(hosts_try_auth) },
97 { "hosts_try_chunking", opt_stringptr, LOFF(hosts_try_chunking) },
99 { "hosts_try_dane", opt_stringptr, LOFF(hosts_try_dane) },
101 { "hosts_try_fastopen", opt_stringptr, LOFF(hosts_try_fastopen) },
103 { "hosts_try_prdr", opt_stringptr, LOFF(hosts_try_prdr) },
106 { "hosts_verify_avoid_tls", opt_stringptr, LOFF(hosts_verify_avoid_tls) },
108 { "interface", opt_stringptr, LOFF(interface) },
109 { "keepalive", opt_bool, LOFF(keepalive) },
110 { "lmtp_ignore_quota", opt_bool, LOFF(lmtp_ignore_quota) },
111 { "max_rcpt", opt_int | opt_public,
112 OPT_OFF(transport_instance, max_addresses) },
113 { "multi_domain", opt_expand_bool | opt_public,
114 OPT_OFF(transport_instance, multi_domain) },
115 { "port", opt_stringptr, LOFF(port) },
116 { "protocol", opt_stringptr, LOFF(protocol) },
117 { "retry_include_ip_address", opt_expand_bool, LOFF(retry_include_ip_address) },
118 { "serialize_hosts", opt_stringptr, LOFF(serialize_hosts) },
119 { "size_addition", opt_int, LOFF(size_addition) },
121 { "socks_proxy", opt_stringptr, LOFF(socks_proxy) },
124 { "tls_certificate", opt_stringptr, LOFF(tls_certificate) },
125 { "tls_crl", opt_stringptr, LOFF(tls_crl) },
126 { "tls_dh_min_bits", opt_int, LOFF(tls_dh_min_bits) },
127 { "tls_privatekey", opt_stringptr, LOFF(tls_privatekey) },
128 { "tls_require_ciphers", opt_stringptr, LOFF(tls_require_ciphers) },
129 # ifdef EXPERIMENTAL_TLS_RESUME
130 { "tls_resumption_hosts", opt_stringptr, LOFF(tls_resumption_hosts) },
132 { "tls_sni", opt_stringptr, LOFF(tls_sni) },
133 { "tls_tempfail_tryclear", opt_bool, LOFF(tls_tempfail_tryclear) },
134 { "tls_try_verify_hosts", opt_stringptr, LOFF(tls_try_verify_hosts) },
135 { "tls_verify_cert_hostnames", opt_stringptr, LOFF(tls_verify_cert_hostnames)},
136 { "tls_verify_certificates", opt_stringptr, LOFF(tls_verify_certificates) },
137 { "tls_verify_hosts", opt_stringptr, LOFF(tls_verify_hosts) },
140 { "utf8_downconvert", opt_stringptr, LOFF(utf8_downconvert) },
144 /* Size of the options list. An extern variable has to be used so that its
145 address can appear in the tables drtables.c. */
147 int smtp_transport_options_count = nelem(smtp_transport_options);
153 smtp_transport_options_block smtp_transport_option_defaults = {0};
154 void smtp_transport_init(transport_instance *tblock) {}
155 BOOL smtp_transport_entry(transport_instance *tblock, address_item *addr) {return FALSE;}
156 void smtp_transport_closedown(transport_instance *tblock) {}
158 #else /*!MACRO_PREDEF*/
161 /* Default private options block for the smtp transport. */
163 smtp_transport_options_block smtp_transport_option_defaults = {
165 .fallback_hosts = NULL,
167 .fallback_hostlist = NULL,
168 .helo_data = US"$primary_hostname",
171 .protocol = US"smtp",
173 .serialize_hosts = NULL,
174 .hosts_try_auth = NULL,
175 .hosts_require_auth = NULL,
176 .hosts_try_chunking = US"*",
178 .hosts_try_dane = US"*",
179 .hosts_require_dane = NULL,
180 .dane_require_tls_ciphers = NULL,
182 .hosts_try_fastopen = US"*",
184 .hosts_try_prdr = US"*",
187 .hosts_request_ocsp = US"*", /* hosts_request_ocsp (except under DANE; tls_client_start()) */
188 .hosts_require_ocsp = NULL,
190 .hosts_require_tls = NULL,
191 .hosts_avoid_tls = NULL,
192 .hosts_verify_avoid_tls = NULL,
193 .hosts_avoid_pipelining = NULL,
194 #ifndef DISABLE_PIPE_CONNECT
195 .hosts_pipe_connect = NULL,
197 .hosts_avoid_esmtp = NULL,
199 .hosts_nopass_tls = NULL,
200 .hosts_noproxy_tls = NULL,
202 .command_timeout = 5*60,
203 .connect_timeout = 5*60,
204 .data_timeout = 5*60,
205 .final_timeout = 10*60,
206 .size_addition = 1024,
208 .hosts_max_try_hardlimit = 50,
209 .address_retry_include_sender = TRUE,
210 .allow_localhost = FALSE,
211 .authenticated_sender_force = FALSE,
212 .gethostbyname = FALSE,
213 .dns_qualify_single = TRUE,
214 .dns_search_parents = FALSE,
215 .dnssec = { .request= US"*", .require=NULL },
216 .delay_after_cutoff = TRUE,
217 .hosts_override = FALSE,
218 .hosts_randomize = FALSE,
220 .lmtp_ignore_quota = FALSE,
221 .expand_retry_include_ip_address = NULL,
222 .retry_include_ip_address = TRUE,
227 .tls_certificate = NULL,
229 .tls_privatekey = NULL,
230 .tls_require_ciphers = NULL,
232 .tls_verify_certificates = US"system",
233 .tls_dh_min_bits = EXIM_CLIENT_DH_DEFAULT_MIN_BITS,
234 .tls_tempfail_tryclear = TRUE,
235 # ifdef EXPERIMENTAL_TLS_RESUME
236 .tls_resumption_hosts = NULL,
238 .tls_verify_hosts = NULL,
239 .tls_try_verify_hosts = US"*",
240 .tls_verify_cert_hostnames = US"*",
243 .utf8_downconvert = NULL,
247 {.dkim_domain = NULL,
248 .dkim_identity = NULL,
249 .dkim_private_key = NULL,
250 .dkim_selector = NULL,
252 .dkim_sign_headers = NULL,
254 .dkim_hash = US"sha256",
255 .dkim_timestamps = NULL,
256 .dot_stuffed = FALSE,
257 .force_bodyhash = FALSE,
258 # ifdef EXPERIMENTAL_ARC
259 .arc_signspec = NULL,
262 # ifdef EXPERIMENTAL_ARC
268 /* some DSN flags for use later */
270 static int rf_list[] = {rf_notify_never, rf_notify_success,
271 rf_notify_failure, rf_notify_delay };
273 static uschar *rf_names[] = { US"NEVER", US"SUCCESS", US"FAILURE", US"DELAY" };
279 static uschar *smtp_command; /* Points to last cmd for error messages */
280 static uschar *mail_command; /* Points to MAIL cmd for error messages */
281 static uschar *data_command = US""; /* Points to DATA cmd for error messages */
282 static BOOL update_waiting; /* TRUE to update the "wait" database */
284 /*XXX move to smtp_context */
285 static BOOL pipelining_active; /* current transaction is in pipe mode */
288 static unsigned ehlo_response(uschar * buf, unsigned checks);
291 /******************************************************************************/
294 smtp_deliver_init(void)
296 if (!regex_PIPELINING) regex_PIPELINING =
297 regex_must_compile(US"\\n250[\\s\\-]PIPELINING(\\s|\\n|$)", FALSE, TRUE);
299 if (!regex_SIZE) regex_SIZE =
300 regex_must_compile(US"\\n250[\\s\\-]SIZE(\\s|\\n|$)", FALSE, TRUE);
302 if (!regex_AUTH) regex_AUTH =
303 regex_must_compile(AUTHS_REGEX, FALSE, TRUE);
306 if (!regex_STARTTLS) regex_STARTTLS =
307 regex_must_compile(US"\\n250[\\s\\-]STARTTLS(\\s|\\n|$)", FALSE, TRUE);
310 if (!regex_CHUNKING) regex_CHUNKING =
311 regex_must_compile(US"\\n250[\\s\\-]CHUNKING(\\s|\\n|$)", FALSE, TRUE);
314 if (!regex_PRDR) regex_PRDR =
315 regex_must_compile(US"\\n250[\\s\\-]PRDR(\\s|\\n|$)", FALSE, TRUE);
319 if (!regex_UTF8) regex_UTF8 =
320 regex_must_compile(US"\\n250[\\s\\-]SMTPUTF8(\\s|\\n|$)", FALSE, TRUE);
323 if (!regex_DSN) regex_DSN =
324 regex_must_compile(US"\\n250[\\s\\-]DSN(\\s|\\n|$)", FALSE, TRUE);
326 if (!regex_IGNOREQUOTA) regex_IGNOREQUOTA =
327 regex_must_compile(US"\\n250[\\s\\-]IGNOREQUOTA(\\s|\\n|$)", FALSE, TRUE);
329 #ifndef DISABLE_PIPE_CONNECT
330 if (!regex_EARLY_PIPE) regex_EARLY_PIPE =
331 regex_must_compile(US"\\n250[\\s\\-]" EARLY_PIPE_FEATURE_NAME "(\\s|\\n|$)", FALSE, TRUE);
336 /*************************************************
337 * Setup entry point *
338 *************************************************/
340 /* This function is called when the transport is about to be used,
341 but before running it in a sub-process. It is used for two things:
343 (1) To set the fallback host list in addresses, when delivering.
344 (2) To pass back the interface, port, protocol, and other options, for use
345 during callout verification.
348 tblock pointer to the transport instance block
349 addrlist list of addresses about to be transported
350 tf if not NULL, pointer to block in which to return options
351 uid the uid that will be set (not used)
352 gid the gid that will be set (not used)
353 errmsg place for error message (not used)
355 Returns: OK always (FAIL, DEFER not used)
359 smtp_transport_setup(transport_instance *tblock, address_item *addrlist,
360 transport_feedback *tf, uid_t uid, gid_t gid, uschar **errmsg)
362 smtp_transport_options_block *ob = SOB tblock->options_block;
364 errmsg = errmsg; /* Keep picky compilers happy */
368 /* Pass back options if required. This interface is getting very messy. */
372 tf->interface = ob->interface;
374 tf->protocol = ob->protocol;
375 tf->hosts = ob->hosts;
376 tf->hosts_override = ob->hosts_override;
377 tf->hosts_randomize = ob->hosts_randomize;
378 tf->gethostbyname = ob->gethostbyname;
379 tf->qualify_single = ob->dns_qualify_single;
380 tf->search_parents = ob->dns_search_parents;
381 tf->helo_data = ob->helo_data;
384 /* Set the fallback host list for all the addresses that don't have fallback
385 host lists, provided that the local host wasn't present in the original host
388 if (!testflag(addrlist, af_local_host_removed))
389 for (; addrlist; addrlist = addrlist->next)
390 if (!addrlist->fallback_hosts) addrlist->fallback_hosts = ob->fallback_hostlist;
397 /*************************************************
398 * Initialization entry point *
399 *************************************************/
401 /* Called for each instance, after its options have been read, to
402 enable consistency checks to be done, or anything else that needs
405 Argument: pointer to the transport instance block
410 smtp_transport_init(transport_instance *tblock)
412 smtp_transport_options_block *ob = SOB tblock->options_block;
414 /* Retry_use_local_part defaults FALSE if unset */
416 if (tblock->retry_use_local_part == TRUE_UNSET)
417 tblock->retry_use_local_part = FALSE;
419 /* Set the default port according to the protocol */
422 ob->port = strcmpic(ob->protocol, US"lmtp") == 0
424 : strcmpic(ob->protocol, US"smtps") == 0
425 ? US"smtps" : US"smtp";
427 /* Set up the setup entry point, to be called before subprocesses for this
430 tblock->setup = smtp_transport_setup;
432 /* Complain if any of the timeouts are zero. */
434 if (ob->command_timeout <= 0 || ob->data_timeout <= 0 ||
435 ob->final_timeout <= 0)
436 log_write(0, LOG_PANIC_DIE|LOG_CONFIG,
437 "command, data, or final timeout value is zero for %s transport",
440 /* If hosts_override is set and there are local hosts, set the global
441 flag that stops verify from showing router hosts. */
443 if (ob->hosts_override && ob->hosts != NULL) tblock->overrides_hosts = TRUE;
445 /* If there are any fallback hosts listed, build a chain of host items
446 for them, but do not do any lookups at this time. */
448 host_build_hostlist(&(ob->fallback_hostlist), ob->fallback_hosts, FALSE);
455 /*************************************************
456 * Set delivery info into all active addresses *
457 *************************************************/
459 /* Only addresses whose status is >= PENDING are relevant. A lesser
460 status means that an address is not currently being processed.
463 addrlist points to a chain of addresses
464 errno_value to put in each address's errno field
465 msg to put in each address's message field
466 rc to put in each address's transport_return field
467 pass_message if TRUE, set the "pass message" flag in the address
468 host if set, mark addrs as having used this host
469 smtp_greeting from peer
470 helo_response from peer
471 start points to timestamp of delivery start
473 If errno_value has the special value ERRNO_CONNECTTIMEOUT, ETIMEDOUT is put in
474 the errno field, and RTEF_CTOUT is ORed into the more_errno field, to indicate
475 this particular type of timeout.
481 set_errno(address_item *addrlist, int errno_value, uschar *msg, int rc,
482 BOOL pass_message, host_item * host,
483 #ifdef EXPERIMENTAL_DSN_INFO
484 const uschar * smtp_greeting, const uschar * helo_response,
486 struct timeval * start
490 struct timeval deliver_time;
492 if (errno_value == ERRNO_CONNECTTIMEOUT)
494 errno_value = ETIMEDOUT;
495 orvalue = RTEF_CTOUT;
497 timesince(&deliver_time, start);
499 for (address_item * addr = addrlist; addr; addr = addr->next)
500 if (addr->transport_return >= PENDING)
502 addr->basic_errno = errno_value;
503 addr->more_errno |= orvalue;
504 addr->delivery_time = deliver_time;
508 if (pass_message) setflag(addr, af_pass_message);
510 addr->transport_return = rc;
513 addr->host_used = host;
514 #ifdef EXPERIMENTAL_DSN_INFO
516 {uschar * s = Ustrchr(smtp_greeting, '\n'); if (s) *s = '\0';}
517 addr->smtp_greeting = smtp_greeting;
520 {uschar * s = Ustrchr(helo_response, '\n'); if (s) *s = '\0';}
521 addr->helo_response = helo_response;
528 set_errno_nohost(address_item * addrlist, int errno_value, uschar * msg, int rc,
529 BOOL pass_message, struct timeval * start)
531 set_errno(addrlist, errno_value, msg, rc, pass_message, NULL,
532 #ifdef EXPERIMENTAL_DSN_INFO
539 /*************************************************
540 * Check an SMTP response *
541 *************************************************/
543 /* This function is given an errno code and the SMTP response buffer
544 to analyse, together with the host identification for generating messages. It
545 sets an appropriate message and puts the first digit of the response code into
546 the yield variable. If no response was actually read, a suitable digit is
550 host the current host, to get its name for messages
551 errno_value pointer to the errno value
552 more_errno from the top address for use with ERRNO_FILTER_FAIL
553 buffer the SMTP response buffer
554 yield where to put a one-digit SMTP response code
555 message where to put an error message
556 pass_message set TRUE if message is an SMTP response
558 Returns: TRUE if an SMTP "QUIT" command should be sent, else FALSE
562 check_response(host_item *host, int *errno_value, int more_errno,
563 uschar *buffer, int *yield, uschar **message, BOOL *pass_message)
565 uschar * pl = pipelining_active ? US"pipelined " : US"";
568 *yield = '4'; /* Default setting is to give a temporary error */
572 case ETIMEDOUT: /* Handle response timeout */
573 *message = US string_sprintf("SMTP timeout after %s%s",
575 if (transport_count > 0)
576 *message = US string_sprintf("%s (%d bytes written)", *message,
580 case ERRNO_SMTPFORMAT: /* Handle malformed SMTP response */
581 s = string_printing(buffer);
582 while (isspace(*s)) s++;
584 ? string_sprintf("Malformed SMTP reply (an empty line) "
585 "in response to %s%s", pl, smtp_command)
586 : string_sprintf("Malformed SMTP reply in response to %s%s: %s",
587 pl, smtp_command, s);
590 case ERRNO_TLSFAILURE: /* Handle bad first read; can happen with
592 *message = US"bad first read from TLS conn";
595 case ERRNO_FILTER_FAIL: /* Handle a failed filter process error;
596 can't send QUIT as we mustn't end the DATA. */
597 *message = string_sprintf("transport filter process failed (%d)%s",
599 more_errno == EX_EXECFAILED ? ": unable to execute command" : "");
602 case ERRNO_CHHEADER_FAIL: /* Handle a failed add_headers expansion;
603 can't send QUIT as we mustn't end the DATA. */
605 string_sprintf("failed to expand headers_add or headers_remove: %s",
606 expand_string_message);
609 case ERRNO_WRITEINCOMPLETE: /* failure to write a complete data block */
610 *message = US"failed to write a data block";
614 case ERRNO_UTF8_FWD: /* no advertised SMTPUTF8, for international message */
615 *message = US"utf8 support required but not offered for forwarding";
616 DEBUG(D_deliver|D_transport) debug_printf("%s\n", *message);
621 /* Handle error responses from the remote mailer. */
625 *message = string_sprintf("SMTP error from remote mail server after %s%s: "
626 "%s", pl, smtp_command, s = string_printing(buffer));
627 *pass_message = TRUE;
632 /* No data was read. If there is no errno, this must be the EOF (i.e.
633 connection closed) case, which causes deferral. An explicit connection reset
634 error has the same effect. Otherwise, put the host's identity in the message,
635 leaving the errno value to be interpreted as well. In all cases, we have to
636 assume the connection is now dead. */
638 if (*errno_value == 0 || *errno_value == ECONNRESET)
640 *errno_value = ERRNO_SMTPCLOSED;
641 *message = US string_sprintf("Remote host closed connection "
642 "in response to %s%s", pl, smtp_command);
645 *message = US string_sprintf("%s [%s]", host->name, host->address);
652 /*************************************************
653 * Write error message to logs *
654 *************************************************/
656 /* This writes to the main log and to the message log.
659 host the current host
660 detail the current message (addr_item->message)
661 basic_errno the errno (addr_item->basic_errno)
667 write_logs(const host_item *host, const uschar *suffix, int basic_errno)
669 gstring * message = LOGGING(outgoing_port)
670 ? string_fmt_append(NULL, "H=%s [%s]:%d", host->name, host->address,
671 host->port == PORT_NONE ? 25 : host->port)
672 : string_fmt_append(NULL, "H=%s [%s]", host->name, host->address);
676 message = string_fmt_append(message, ": %s", suffix);
678 message = string_fmt_append(message, ": %s", strerror(basic_errno));
681 message = string_fmt_append(message, " %s", exim_errstr(basic_errno));
683 log_write(0, LOG_MAIN, "%s", string_from_gstring(message));
684 deliver_msglog("%s %s\n", tod_stamp(tod_log), message->s);
688 msglog_line(host_item * host, uschar * message)
690 deliver_msglog("%s H=%s [%s] %s\n", tod_stamp(tod_log),
691 host->name, host->address, message);
696 #ifndef DISABLE_EVENT
697 /*************************************************
698 * Post-defer action *
699 *************************************************/
701 /* This expands an arbitrary per-transport string.
702 It might, for example, be used to write to the database log.
705 addr the address item containing error information
706 host the current host
713 deferred_event_raise(address_item * addr, host_item * host, uschar * evstr)
715 uschar * action = addr->transport->event_action;
716 const uschar * save_domain;
722 save_domain = deliver_domain;
723 save_local = deliver_localpart;
725 /*XXX would ip & port already be set up? */
726 deliver_host_address = string_copy(host->address);
727 deliver_host_port = host->port == PORT_NONE ? 25 : host->port;
728 event_defer_errno = addr->basic_errno;
730 router_name = addr->router->name;
731 transport_name = addr->transport->name;
732 deliver_domain = addr->domain;
733 deliver_localpart = addr->local_part;
735 (void) event_raise(action, evstr,
737 ? addr->basic_errno > 0
738 ? string_sprintf("%s: %s", addr->message, strerror(addr->basic_errno))
739 : string_copy(addr->message)
740 : addr->basic_errno > 0
741 ? string_copy(US strerror(addr->basic_errno))
744 deliver_localpart = save_local;
745 deliver_domain = save_domain;
746 router_name = transport_name = NULL;
750 /*************************************************
751 * Reap SMTP specific responses *
752 *************************************************/
754 smtp_discard_responses(smtp_context * sx, smtp_transport_options_block * ob,
757 uschar flushbuffer[4096];
761 if (!smtp_read_response(sx, flushbuffer, sizeof(flushbuffer),
762 '2', ob->command_timeout)
763 && (errno != 0 || flushbuffer[0] == 0))
770 /* Return boolean success */
773 smtp_reap_banner(smtp_context * sx)
775 BOOL good_response = smtp_read_response(sx, sx->buffer, sizeof(sx->buffer),
776 '2', (SOB sx->conn_args.ob)->command_timeout);
777 #ifdef EXPERIMENTAL_DSN_INFO
778 sx->smtp_greeting = string_copy(sx->buffer);
780 return good_response;
784 smtp_reap_ehlo(smtp_context * sx)
786 if (!smtp_read_response(sx, sx->buffer, sizeof(sx->buffer), '2',
787 (SOB sx->conn_args.ob)->command_timeout))
789 if (errno != 0 || sx->buffer[0] == 0 || sx->lmtp)
791 #ifdef EXPERIMENTAL_DSN_INFO
792 sx->helo_response = string_copy(sx->buffer);
798 #ifdef EXPERIMENTAL_DSN_INFO
799 sx->helo_response = string_copy(sx->buffer);
801 #ifndef DISABLE_EVENT
802 (void) event_raise(sx->conn_args.tblock->event_action,
803 US"smtp:ehlo", sx->buffer);
810 #ifndef DISABLE_PIPE_CONNECT
812 ehlo_cache_key(const smtp_context * sx)
814 host_item * host = sx->conn_args.host;
815 return Ustrchr(host->address, ':')
816 ? string_sprintf("[%s]:%d.EHLO", host->address,
817 host->port == PORT_NONE ? sx->port : host->port)
818 : string_sprintf("%s:%d.EHLO", host->address,
819 host->port == PORT_NONE ? sx->port : host->port);
823 write_ehlo_cache_entry(const smtp_context * sx)
825 open_db dbblock, * dbm_file;
827 if ((dbm_file = dbfn_open(US"misc", O_RDWR, &dbblock, TRUE, TRUE)))
829 uschar * ehlo_resp_key = ehlo_cache_key(sx);
830 dbdata_ehlo_resp er = { .data = sx->ehlo_resp };
832 HDEBUG(D_transport) debug_printf("writing clr %04x/%04x cry %04x/%04x\n",
833 sx->ehlo_resp.cleartext_features, sx->ehlo_resp.cleartext_auths,
834 sx->ehlo_resp.crypted_features, sx->ehlo_resp.crypted_auths);
836 dbfn_write(dbm_file, ehlo_resp_key, &er, (int)sizeof(er));
837 dbfn_close(dbm_file);
842 invalidate_ehlo_cache_entry(smtp_context * sx)
844 open_db dbblock, * dbm_file;
846 if ( sx->early_pipe_active
847 && (dbm_file = dbfn_open(US"misc", O_RDWR, &dbblock, TRUE, TRUE)))
849 uschar * ehlo_resp_key = ehlo_cache_key(sx);
850 dbfn_delete(dbm_file, ehlo_resp_key);
851 dbfn_close(dbm_file);
856 read_ehlo_cache_entry(smtp_context * sx)
861 if (!(dbm_file = dbfn_open(US"misc", O_RDONLY, &dbblock, FALSE, TRUE)))
862 { DEBUG(D_transport) debug_printf("ehlo-cache: no misc DB\n"); }
865 uschar * ehlo_resp_key = ehlo_cache_key(sx);
866 dbdata_ehlo_resp * er;
868 if (!(er = dbfn_read(dbm_file, ehlo_resp_key)))
869 { DEBUG(D_transport) debug_printf("no ehlo-resp record\n"); }
870 else if (time(NULL) - er->time_stamp > retry_data_expire)
872 DEBUG(D_transport) debug_printf("ehlo-resp record too old\n");
873 dbfn_close(dbm_file);
874 if ((dbm_file = dbfn_open(US"misc", O_RDWR, &dbblock, TRUE, TRUE)))
875 dbfn_delete(dbm_file, ehlo_resp_key);
879 sx->ehlo_resp = er->data;
880 dbfn_close(dbm_file);
881 DEBUG(D_transport) debug_printf(
882 "EHLO response bits from cache: cleartext 0x%04x/0x%04x crypted 0x%04x/0x%04x\n",
883 er->data.cleartext_features, er->data.cleartext_auths,
884 er->data.crypted_features, er->data.crypted_auths);
887 dbfn_close(dbm_file);
894 /* Return an auths bitmap for the set of AUTH methods offered by the server
895 which match our authenticators. */
897 static unsigned short
898 study_ehlo_auths(smtp_context * sx)
903 unsigned short authbits = 0;
905 if (!sx->esmtp) return 0;
906 if (!regex_AUTH) regex_AUTH = regex_must_compile(AUTHS_REGEX, FALSE, TRUE);
907 if (!regex_match_and_setup(regex_AUTH, sx->buffer, 0, -1)) return 0;
908 expand_nmax = -1; /* reset */
909 names = string_copyn(expand_nstring[1], expand_nlength[1]);
911 for (au = auths, authnum = 0; au; au = au->next, authnum++) if (au->client)
913 const uschar * list = names;
917 while (string_nextinlist(&list, &sep, name, sizeof(name)))
918 if (strcmpic(au->public_name, name) == 0)
919 { authbits |= BIT(authnum); break; }
923 debug_printf("server offers %s AUTH, methods '%s', bitmap 0x%04x\n",
924 tls_out.active.sock >= 0 ? "crypted" : "plaintext", names, authbits);
926 if (tls_out.active.sock >= 0)
927 sx->ehlo_resp.crypted_auths = authbits;
929 sx->ehlo_resp.cleartext_auths = authbits;
936 /* Wait for and check responses for early-pipelining.
938 Called from the lower-level smtp_read_response() function
939 used for general code that assume synchronisation, if context
940 flags indicate outstanding early-pipelining commands. Also
941 called fom sync_responses() which handles pipelined commands.
944 sx smtp connection context
945 countp number of outstanding responses, adjusted on return
949 DEFER error on first read of TLS'd conn
950 FAIL SMTP error in response
953 smtp_reap_early_pipe(smtp_context * sx, int * countp)
955 BOOL pending_BANNER = sx->pending_BANNER;
956 BOOL pending_EHLO = sx->pending_EHLO;
959 sx->pending_BANNER = FALSE; /* clear early to avoid recursion */
960 sx->pending_EHLO = FALSE;
964 DEBUG(D_transport) debug_printf("%s expect banner\n", __FUNCTION__);
966 if (!smtp_reap_banner(sx))
968 DEBUG(D_transport) debug_printf("bad banner\n");
969 if (tls_out.active.sock >= 0) rc = DEFER;
976 unsigned peer_offered;
977 unsigned short authbits = 0, * ap;
979 DEBUG(D_transport) debug_printf("%s expect ehlo\n", __FUNCTION__);
981 if (!smtp_reap_ehlo(sx))
983 DEBUG(D_transport) debug_printf("bad response for EHLO\n");
984 if (tls_out.active.sock >= 0) rc = DEFER;
988 /* Compare the actual EHLO response to the cached value we assumed;
989 on difference, dump or rewrite the cache and arrange for a retry. */
991 ap = tls_out.active.sock < 0
992 ? &sx->ehlo_resp.cleartext_auths : &sx->ehlo_resp.crypted_auths;
994 peer_offered = ehlo_response(sx->buffer,
995 (tls_out.active.sock < 0 ? OPTION_TLS : 0)
996 | OPTION_CHUNKING | OPTION_PRDR | OPTION_DSN | OPTION_PIPE | OPTION_SIZE
997 | OPTION_UTF8 | OPTION_EARLY_PIPE
999 if ( peer_offered != sx->peer_offered
1000 || (authbits = study_ehlo_auths(sx)) != *ap)
1003 debug_printf("EHLO %s extensions changed, 0x%04x/0x%04x -> 0x%04x/0x%04x\n",
1004 tls_out.active.sock < 0 ? "cleartext" : "crypted",
1005 sx->peer_offered, *ap, peer_offered, authbits);
1006 *(tls_out.active.sock < 0
1007 ? &sx->ehlo_resp.cleartext_features : &sx->ehlo_resp.crypted_features) = peer_offered;
1009 if (peer_offered & OPTION_EARLY_PIPE)
1010 write_ehlo_cache_entry(sx);
1012 invalidate_ehlo_cache_entry(sx);
1014 return OK; /* just carry on */
1020 invalidate_ehlo_cache_entry(sx);
1021 (void) smtp_discard_responses(sx, sx->conn_args.ob, *countp);
1027 /*************************************************
1028 * Synchronize SMTP responses *
1029 *************************************************/
1031 /* This function is called from smtp_deliver() to receive SMTP responses from
1032 the server, and match them up with the commands to which they relate. When
1033 PIPELINING is not in use, this function is called after every command, and is
1034 therefore somewhat over-engineered, but it is simpler to use a single scheme
1035 that works both with and without PIPELINING instead of having two separate sets
1038 The set of commands that are buffered up with pipelining may start with MAIL
1039 and may end with DATA; in between are RCPT commands that correspond to the
1040 addresses whose status is PENDING_DEFER. All other commands (STARTTLS, AUTH,
1041 etc.) are never buffered.
1043 Errors after MAIL or DATA abort the whole process leaving the response in the
1044 buffer. After MAIL, pending responses are flushed, and the original command is
1045 re-instated in big_buffer for error messages. For RCPT commands, the remote is
1046 permitted to reject some recipient addresses while accepting others. However
1047 certain errors clearly abort the whole process. Set the value in
1048 transport_return to PENDING_OK if the address is accepted. If there is a
1049 subsequent general error, it will get reset accordingly. If not, it will get
1050 converted to OK at the end.
1053 sx smtp connection context
1054 count the number of responses to read
1055 pending_DATA 0 if last command sent was not DATA
1056 +1 if previously had a good recipient
1057 -1 if not previously had a good recipient
1059 Returns: 3 if at least one address had 2xx and one had 5xx
1060 2 if at least one address had 5xx but none had 2xx
1061 1 if at least one host had a 2xx response, but none had 5xx
1062 0 no address had 2xx or 5xx but no errors (all 4xx, or just DATA)
1063 -1 timeout while reading RCPT response
1064 -2 I/O or other non-response error for RCPT
1065 -3 DATA or MAIL failed - errno and buffer set
1066 -4 banner or EHLO failed (early-pipelining)
1067 -5 banner or EHLO failed (early-pipelining, TLS)
1071 sync_responses(smtp_context * sx, int count, int pending_DATA)
1073 address_item * addr = sx->sync_addr;
1074 smtp_transport_options_block * ob = sx->conn_args.ob;
1077 #ifndef DISABLE_PIPE_CONNECT
1079 if ((rc = smtp_reap_early_pipe(sx, &count)) != OK)
1080 return rc == FAIL ? -4 : -5;
1083 /* Handle the response for a MAIL command. On error, reinstate the original
1084 command in big_buffer for error message use, and flush any further pending
1085 responses before returning, except after I/O errors and timeouts. */
1087 if (sx->pending_MAIL)
1089 DEBUG(D_transport) debug_printf("%s expect mail\n", __FUNCTION__);
1091 sx->pending_MAIL = FALSE;
1092 if (!smtp_read_response(sx, sx->buffer, sizeof(sx->buffer),
1093 '2', ob->command_timeout))
1095 DEBUG(D_transport) debug_printf("bad response for MAIL\n");
1096 Ustrcpy(big_buffer, mail_command); /* Fits, because it came from there! */
1097 if (errno == ERRNO_TLSFAILURE)
1099 if (errno == 0 && sx->buffer[0] != 0)
1102 if (sx->buffer[0] == '4')
1104 save_errno = ERRNO_MAIL4XX;
1105 addr->more_errno |= ((sx->buffer[1] - '0')*10 + sx->buffer[2] - '0') << 8;
1107 count = smtp_discard_responses(sx, ob, count);
1111 if (pending_DATA) count--; /* Number of RCPT responses to come */
1112 while (count-- > 0) /* Mark any pending addrs with the host used */
1114 while (addr->transport_return != PENDING_DEFER) addr = addr->next;
1115 addr->host_used = sx->conn_args.host;
1122 if (pending_DATA) count--; /* Number of RCPT responses to come */
1124 /* Read and handle the required number of RCPT responses, matching each one up
1125 with an address by scanning for the next address whose status is PENDING_DEFER.
1130 while (addr->transport_return != PENDING_DEFER)
1131 if (!(addr = addr->next))
1134 /* The address was accepted */
1135 addr->host_used = sx->conn_args.host;
1137 DEBUG(D_transport) debug_printf("%s expect rcpt\n", __FUNCTION__);
1138 if (smtp_read_response(sx, sx->buffer, sizeof(sx->buffer),
1139 '2', ob->command_timeout))
1142 addr->transport_return = PENDING_OK;
1144 /* If af_dr_retry_exists is set, there was a routing delay on this address;
1145 ensure that any address-specific retry record is expunged. We do this both
1146 for the basic key and for the version that also includes the sender. */
1148 if (testflag(addr, af_dr_retry_exists))
1150 uschar *altkey = string_sprintf("%s:<%s>", addr->address_retry_key,
1152 retry_add_item(addr, altkey, rf_delete);
1153 retry_add_item(addr, addr->address_retry_key, rf_delete);
1157 /* Error on first TLS read */
1159 else if (errno == ERRNO_TLSFAILURE)
1162 /* Timeout while reading the response */
1164 else if (errno == ETIMEDOUT)
1166 uschar *message = string_sprintf("SMTP timeout after RCPT TO:<%s>",
1167 transport_rcpt_address(addr, sx->conn_args.tblock->rcpt_include_affixes));
1168 set_errno_nohost(sx->first_addr, ETIMEDOUT, message, DEFER, FALSE, &sx->delivery_start);
1169 retry_add_item(addr, addr->address_retry_key, 0);
1170 update_waiting = FALSE;
1174 /* Handle other errors in obtaining an SMTP response by returning -1. This
1175 will cause all the addresses to be deferred. Restore the SMTP command in
1176 big_buffer for which we are checking the response, so the error message
1179 else if (errno != 0 || sx->buffer[0] == 0)
1181 gstring gs = { .size = big_buffer_size, .ptr = 0, .s = big_buffer }, * g = &gs;
1183 /* Use taint-unchecked routines for writing into big_buffer, trusting
1184 that we'll never expand it. */
1186 g = string_fmt_append_f(g, SVFMT_TAINT_NOCHK, "RCPT TO:<%s>",
1187 transport_rcpt_address(addr, sx->conn_args.tblock->rcpt_include_affixes));
1188 string_from_gstring(g);
1192 /* Handle SMTP permanent and temporary response codes. */
1197 string_sprintf("SMTP error from remote mail server after RCPT TO:<%s>: "
1198 "%s", transport_rcpt_address(addr, sx->conn_args.tblock->rcpt_include_affixes),
1199 string_printing(sx->buffer));
1200 setflag(addr, af_pass_message);
1202 msglog_line(sx->conn_args.host, addr->message);
1204 /* The response was 5xx */
1206 if (sx->buffer[0] == '5')
1208 addr->transport_return = FAIL;
1212 /* The response was 4xx */
1216 addr->transport_return = DEFER;
1217 addr->basic_errno = ERRNO_RCPT4XX;
1218 addr->more_errno |= ((sx->buffer[1] - '0')*10 + sx->buffer[2] - '0') << 8;
1222 #ifndef DISABLE_EVENT
1223 event_defer_errno = addr->more_errno;
1224 msg_event_raise(US"msg:rcpt:host:defer", addr);
1226 /* If a 452 and we've had at least one 2xx or 5xx, set next_addr to the
1227 start point for another MAIL command. */
1229 if (addr->more_errno >> 8 == 52 && yield & 3)
1234 debug_printf("%s: seen first 452 too-many-rcpts\n", __FUNCTION__);
1235 sx->RCPT_452 = TRUE;
1236 sx->next_addr = addr;
1238 addr->transport_return = PENDING_DEFER;
1239 addr->basic_errno = 0;
1243 /* Log temporary errors if there are more hosts to be tried.
1244 If not, log this last one in the == line. */
1246 if (sx->conn_args.host->next)
1247 if (LOGGING(outgoing_port))
1248 log_write(0, LOG_MAIN, "H=%s [%s]:%d %s", sx->conn_args.host->name,
1249 sx->conn_args.host->address,
1250 sx->port == PORT_NONE ? 25 : sx->port, addr->message);
1252 log_write(0, LOG_MAIN, "H=%s [%s]: %s", sx->conn_args.host->name,
1253 sx->conn_args.host->address, addr->message);
1255 #ifndef DISABLE_EVENT
1257 msg_event_raise(US"msg:rcpt:defer", addr);
1260 /* Do not put this message on the list of those waiting for specific
1261 hosts, as otherwise it is likely to be tried too often. */
1263 update_waiting = FALSE;
1265 /* Add a retry item for the address so that it doesn't get tried again
1266 too soon. If address_retry_include_sender is true, add the sender address
1267 to the retry key. */
1269 retry_add_item(addr,
1270 ob->address_retry_include_sender
1271 ? string_sprintf("%s:<%s>", addr->address_retry_key, sender_address)
1272 : addr->address_retry_key,
1278 } /* Loop for next RCPT response */
1280 /* Update where to start at for the next block of responses, unless we
1281 have already handled all the addresses. */
1283 if (addr) sx->sync_addr = addr->next;
1285 /* Handle a response to DATA. If we have not had any good recipients, either
1286 previously or in this block, the response is ignored. */
1288 if (pending_DATA != 0)
1290 DEBUG(D_transport) debug_printf("%s expect data\n", __FUNCTION__);
1291 if (!smtp_read_response(sx, sx->buffer, sizeof(sx->buffer),
1292 '3', ob->command_timeout))
1298 if (errno == ERRNO_TLSFAILURE) /* Error on first TLS read */
1301 if (pending_DATA > 0 || (yield & 1) != 0)
1303 if (errno == 0 && sx->buffer[0] == '4')
1305 errno = ERRNO_DATA4XX;
1306 sx->first_addr->more_errno |= ((sx->buffer[1] - '0')*10 + sx->buffer[2] - '0') << 8;
1310 (void)check_response(sx->conn_args.host, &errno, 0, sx->buffer, &code, &msg, &pass_message);
1311 DEBUG(D_transport) debug_printf("%s\nerror for DATA ignored: pipelining "
1312 "is in use and there were no good recipients\n", msg);
1316 /* All responses read and handled; MAIL (if present) received 2xx and DATA (if
1317 present) received 3xx. If any RCPTs were handled and yielded anything other
1318 than 4xx, yield will be set non-zero. */
1327 /* Try an authenticator's client entry */
1330 try_authenticator(smtp_context * sx, auth_instance * au)
1332 smtp_transport_options_block * ob = sx->conn_args.ob; /* transport options */
1333 host_item * host = sx->conn_args.host; /* host to deliver to */
1336 sx->outblock.authenticating = TRUE;
1337 rc = (au->info->clientcode)(au, sx, ob->command_timeout,
1338 sx->buffer, sizeof(sx->buffer));
1339 sx->outblock.authenticating = FALSE;
1340 DEBUG(D_transport) debug_printf("%s authenticator yielded %d\n", au->name, rc);
1342 /* A temporary authentication failure must hold up delivery to
1343 this host. After a permanent authentication failure, we carry on
1344 to try other authentication methods. If all fail hard, try to
1345 deliver the message unauthenticated unless require_auth was set. */
1350 f.smtp_authenticated = TRUE; /* stops the outer loop */
1351 client_authenticator = au->name;
1352 if (au->set_client_id)
1353 client_authenticated_id = expand_string(au->set_client_id);
1356 /* Failure after writing a command */
1361 /* Failure after reading a response */
1364 if (errno != 0 || sx->buffer[0] != '5') return FAIL;
1365 log_write(0, LOG_MAIN, "%s authenticator failed H=%s [%s] %s",
1366 au->name, host->name, host->address, sx->buffer);
1369 /* Failure by some other means. In effect, the authenticator
1370 decided it wasn't prepared to handle this case. Typically this
1371 is the result of "fail" in an expansion string. Do we need to
1372 log anything here? Feb 2006: a message is now put in the buffer
1373 if logging is required. */
1376 if (*sx->buffer != 0)
1377 log_write(0, LOG_MAIN, "%s authenticator cancelled "
1378 "authentication H=%s [%s] %s", au->name, host->name,
1379 host->address, sx->buffer);
1382 /* Internal problem, message in buffer. */
1385 set_errno_nohost(sx->addrlist, ERRNO_AUTHPROB, string_copy(sx->buffer),
1386 DEFER, FALSE, &sx->delivery_start);
1395 /* Do the client side of smtp-level authentication.
1398 sx smtp connection context
1400 sx->buffer should have the EHLO response from server (gets overwritten)
1403 OK Success, or failed (but not required): global "smtp_authenticated" set
1404 DEFER Failed authentication (and was required)
1405 ERROR Internal problem
1407 FAIL_SEND Failed communications - transmit
1412 smtp_auth(smtp_context * sx)
1414 host_item * host = sx->conn_args.host; /* host to deliver to */
1415 smtp_transport_options_block * ob = sx->conn_args.ob; /* transport options */
1416 int require_auth = verify_check_given_host(CUSS &ob->hosts_require_auth, host);
1417 #ifndef DISABLE_PIPE_CONNECT
1418 unsigned short authbits = tls_out.active.sock >= 0
1419 ? sx->ehlo_resp.crypted_auths : sx->ehlo_resp.cleartext_auths;
1421 uschar * fail_reason = US"server did not advertise AUTH support";
1423 f.smtp_authenticated = FALSE;
1424 client_authenticator = client_authenticated_id = client_authenticated_sender = NULL;
1427 regex_AUTH = regex_must_compile(AUTHS_REGEX, FALSE, TRUE);
1429 /* Is the server offering AUTH? */
1433 #ifndef DISABLE_PIPE_CONNECT
1434 sx->early_pipe_active ? authbits
1437 regex_match_and_setup(regex_AUTH, sx->buffer, 0, -1)
1440 uschar * names = NULL;
1441 expand_nmax = -1; /* reset */
1443 #ifndef DISABLE_PIPE_CONNECT
1444 if (!sx->early_pipe_active)
1446 names = string_copyn(expand_nstring[1], expand_nlength[1]);
1448 /* Must not do this check until after we have saved the result of the
1449 regex match above as the check could be another RE. */
1451 if ( require_auth == OK
1452 || verify_check_given_host(CUSS &ob->hosts_try_auth, host) == OK)
1454 DEBUG(D_transport) debug_printf("scanning authentication mechanisms\n");
1455 fail_reason = US"no common mechanisms were found";
1457 #ifndef DISABLE_PIPE_CONNECT
1458 if (sx->early_pipe_active)
1460 /* Scan our authenticators (which support use by a client and were offered
1461 by the server (checked at cache-write time)), not suppressed by
1462 client_condition. If one is found, attempt to authenticate by calling its
1463 client function. We are limited to supporting up to 16 authenticator
1464 public-names by the number of bits in a short. */
1470 for (bitnum = 0, au = auths;
1471 !f.smtp_authenticated && au && bitnum < 16;
1472 bitnum++, au = au->next) if (authbits & BIT(bitnum))
1474 if ( au->client_condition
1475 && !expand_check_condition(au->client_condition, au->name,
1476 US"client authenticator"))
1478 DEBUG(D_transport) debug_printf("skipping %s authenticator: %s\n",
1479 au->name, "client_condition is false");
1483 /* Found data for a listed mechanism. Call its client entry. Set
1484 a flag in the outblock so that data is overwritten after sending so
1485 that reflections don't show it. */
1487 fail_reason = US"authentication attempt(s) failed";
1489 if ((rc = try_authenticator(sx, au)) != OK)
1496 /* Scan the configured authenticators looking for one which is configured
1497 for use as a client, which is not suppressed by client_condition, and
1498 whose name matches an authentication mechanism supported by the server.
1499 If one is found, attempt to authenticate by calling its client function.
1502 for (auth_instance * au = auths; !f.smtp_authenticated && au; au = au->next)
1507 || ( au->client_condition
1508 && !expand_check_condition(au->client_condition, au->name,
1509 US"client authenticator")))
1511 DEBUG(D_transport) debug_printf("skipping %s authenticator: %s\n",
1513 (au->client)? "client_condition is false" :
1514 "not configured as a client");
1518 /* Loop to scan supported server mechanisms */
1522 int len = Ustrlen(au->public_name);
1525 while (isspace(*p)) p++;
1527 if (strncmpic(au->public_name, p, len) != 0 ||
1528 (p[len] != 0 && !isspace(p[len])))
1530 while (*p != 0 && !isspace(*p)) p++;
1534 /* Found data for a listed mechanism. Call its client entry. Set
1535 a flag in the outblock so that data is overwritten after sending so
1536 that reflections don't show it. */
1538 fail_reason = US"authentication attempt(s) failed";
1540 if ((rc = try_authenticator(sx, au)) != OK)
1543 break; /* If not authenticated, try next authenticator */
1544 } /* Loop for scanning supported server mechanisms */
1545 } /* Loop for further authenticators */
1549 /* If we haven't authenticated, but are required to, give up. */
1551 if (require_auth == OK && !f.smtp_authenticated)
1553 set_errno_nohost(sx->addrlist, ERRNO_AUTHFAIL,
1554 string_sprintf("authentication required but %s", fail_reason), DEFER,
1555 FALSE, &sx->delivery_start);
1563 /* Construct AUTH appendix string for MAIL TO */
1566 sx context for smtp connection
1567 p point in sx->buffer to build string
1568 addrlist chain of potential addresses to deliver
1570 Globals f.smtp_authenticated
1571 client_authenticated_sender
1572 Return True on error, otherwise buffer has (possibly empty) terminated string
1576 smtp_mail_auth_str(smtp_context * sx, uschar * p, address_item * addrlist)
1578 smtp_transport_options_block * ob = sx->conn_args.ob;
1579 uschar * local_authenticated_sender = authenticated_sender;
1582 debug_printf("smtp_mail_auth_str: as<%s> os<%s> SA<%s>\n",
1583 authenticated_sender, ob->authenticated_sender, f.smtp_authenticated?"Y":"N");
1586 if (ob->authenticated_sender)
1588 uschar * new = expand_string(ob->authenticated_sender);
1591 if (!f.expand_string_forcedfail)
1593 uschar *message = string_sprintf("failed to expand "
1594 "authenticated_sender: %s", expand_string_message);
1595 set_errno_nohost(addrlist, ERRNO_EXPANDFAIL, message, DEFER, FALSE, &sx->delivery_start);
1600 local_authenticated_sender = new;
1603 /* Add the authenticated sender address if present */
1605 if ( (f.smtp_authenticated || ob->authenticated_sender_force)
1606 && local_authenticated_sender)
1608 string_format_nt(p, sizeof(sx->buffer) - (p-sx->buffer), " AUTH=%s",
1609 auth_xtextencode(local_authenticated_sender,
1610 Ustrlen(local_authenticated_sender)));
1611 client_authenticated_sender = string_copy(local_authenticated_sender);
1621 typedef struct smtp_compare_s
1623 uschar *current_sender_address;
1624 struct transport_instance *tblock;
1628 /* Create a unique string that identifies this message, it is based on
1629 sender_address, helo_data and tls_certificate if enabled.
1633 smtp_local_identity(uschar * sender, struct transport_instance * tblock)
1635 address_item * addr1;
1636 uschar * if1 = US"";
1637 uschar * helo1 = US"";
1639 uschar * tlsc1 = US"";
1641 uschar * save_sender_address = sender_address;
1642 uschar * local_identity = NULL;
1643 smtp_transport_options_block * ob = SOB tblock->options_block;
1645 sender_address = sender;
1647 addr1 = deliver_make_addr (sender, TRUE);
1648 deliver_set_expansions(addr1);
1651 if1 = expand_string(ob->interface);
1654 helo1 = expand_string(ob->helo_data);
1657 if (ob->tls_certificate)
1658 tlsc1 = expand_string(ob->tls_certificate);
1659 local_identity = string_sprintf ("%s^%s^%s", if1, helo1, tlsc1);
1661 local_identity = string_sprintf ("%s^%s", if1, helo1);
1664 deliver_set_expansions(NULL);
1665 sender_address = save_sender_address;
1667 return local_identity;
1672 /* This routine is a callback that is called from transport_check_waiting.
1673 This function will evaluate the incoming message versus the previous
1674 message. If the incoming message is using a different local identity then
1675 we will veto this new message. */
1678 smtp_are_same_identities(uschar * message_id, smtp_compare_t * s_compare)
1680 uschar * message_local_identity,
1681 * current_local_identity,
1682 * new_sender_address;
1684 current_local_identity =
1685 smtp_local_identity(s_compare->current_sender_address, s_compare->tblock);
1687 if (!(new_sender_address = deliver_get_sender_address(message_id)))
1690 message_local_identity =
1691 smtp_local_identity(new_sender_address, s_compare->tblock);
1693 return Ustrcmp(current_local_identity, message_local_identity) == 0;
1699 ehlo_response(uschar * buf, unsigned checks)
1701 size_t bsize = Ustrlen(buf);
1703 /* debug_printf("%s: check for 0x%04x\n", __FUNCTION__, checks); */
1706 if ( checks & OPTION_TLS
1707 && pcre_exec(regex_STARTTLS, NULL, CS buf, bsize, 0, PCRE_EOPT, NULL, 0) < 0)
1709 checks &= ~OPTION_TLS;
1711 if ( checks & OPTION_IGNQ
1712 && pcre_exec(regex_IGNOREQUOTA, NULL, CS buf, bsize, 0,
1713 PCRE_EOPT, NULL, 0) < 0)
1714 checks &= ~OPTION_IGNQ;
1716 if ( checks & OPTION_CHUNKING
1717 && pcre_exec(regex_CHUNKING, NULL, CS buf, bsize, 0, PCRE_EOPT, NULL, 0) < 0)
1718 checks &= ~OPTION_CHUNKING;
1720 #ifndef DISABLE_PRDR
1721 if ( checks & OPTION_PRDR
1722 && pcre_exec(regex_PRDR, NULL, CS buf, bsize, 0, PCRE_EOPT, NULL, 0) < 0)
1724 checks &= ~OPTION_PRDR;
1727 if ( checks & OPTION_UTF8
1728 && pcre_exec(regex_UTF8, NULL, CS buf, bsize, 0, PCRE_EOPT, NULL, 0) < 0)
1730 checks &= ~OPTION_UTF8;
1732 if ( checks & OPTION_DSN
1733 && pcre_exec(regex_DSN, NULL, CS buf, bsize, 0, PCRE_EOPT, NULL, 0) < 0)
1734 checks &= ~OPTION_DSN;
1736 if ( checks & OPTION_PIPE
1737 && pcre_exec(regex_PIPELINING, NULL, CS buf, bsize, 0,
1738 PCRE_EOPT, NULL, 0) < 0)
1739 checks &= ~OPTION_PIPE;
1741 if ( checks & OPTION_SIZE
1742 && pcre_exec(regex_SIZE, NULL, CS buf, bsize, 0, PCRE_EOPT, NULL, 0) < 0)
1743 checks &= ~OPTION_SIZE;
1745 #ifndef DISABLE_PIPE_CONNECT
1746 if ( checks & OPTION_EARLY_PIPE
1747 && pcre_exec(regex_EARLY_PIPE, NULL, CS buf, bsize, 0,
1748 PCRE_EOPT, NULL, 0) < 0)
1750 checks &= ~OPTION_EARLY_PIPE;
1752 /* debug_printf("%s: found 0x%04x\n", __FUNCTION__, checks); */
1758 /* Callback for emitting a BDAT data chunk header.
1760 If given a nonzero size, first flush any buffered SMTP commands
1761 then emit the command.
1763 Reap previous SMTP command responses if requested, and always reap
1764 the response from a previous BDAT command.
1767 tctx transport context
1768 chunk_size value for SMTP BDAT command
1770 tc_chunk_last add LAST option to SMTP BDAT command
1771 tc_reap_prev reap response to previous SMTP commands
1775 DEFER TLS error on first read (EHLO-resp); errno set
1779 smtp_chunk_cmd_callback(transport_ctx * tctx, unsigned chunk_size,
1782 smtp_transport_options_block * ob = SOB tctx->tblock->options_block;
1783 smtp_context * sx = tctx->smtp_context;
1787 /* Write SMTP chunk header command. If not reaping responses, note that
1788 there may be more writes (like, the chunk data) done soon. */
1792 #ifndef DISABLE_PIPE_CONNECT
1793 BOOL new_conn = !!(sx->outblock.conn_args);
1795 if((cmd_count = smtp_write_command(sx,
1796 flags & tc_reap_prev ? SCMD_FLUSH : SCMD_MORE,
1797 "BDAT %u%s\r\n", chunk_size, flags & tc_chunk_last ? " LAST" : "")
1798 ) < 0) return ERROR;
1799 if (flags & tc_chunk_last)
1800 data_command = string_copy(big_buffer); /* Save for later error message */
1801 #ifndef DISABLE_PIPE_CONNECT
1802 /* That command write could have been the one that made the connection.
1803 Copy the fd from the client conn ctx (smtp transport specific) to the
1804 generic transport ctx. */
1807 tctx->u.fd = sx->outblock.cctx->sock;
1811 prev_cmd_count = cmd_count += sx->cmd_count;
1813 /* Reap responses for any previous, but not one we just emitted */
1817 if (sx->pending_BDAT)
1820 if (flags & tc_reap_prev && prev_cmd_count > 0)
1822 DEBUG(D_transport) debug_printf("look for %d responses"
1823 " for previous pipelined cmds\n", prev_cmd_count);
1825 switch(sync_responses(sx, prev_cmd_count, 0))
1827 case 1: /* 2xx (only) => OK */
1828 case 3: sx->good_RCPT = TRUE; /* 2xx & 5xx => OK & progress made */
1829 case 2: sx->completed_addr = TRUE; /* 5xx (only) => progress made */
1830 case 0: break; /* No 2xx or 5xx, but no probs */
1832 case -5: errno = ERRNO_TLSFAILURE;
1834 #ifndef DISABLE_PIPE_CONNECT
1835 case -4: /* non-2xx for pipelined banner or EHLO */
1837 case -1: /* Timeout on RCPT */
1838 default: return ERROR; /* I/O error, or any MAIL/DATA error */
1841 if (!sx->pending_BDAT)
1842 pipelining_active = FALSE;
1845 /* Reap response for an outstanding BDAT */
1847 if (sx->pending_BDAT)
1849 DEBUG(D_transport) debug_printf("look for one response for BDAT\n");
1851 if (!smtp_read_response(sx, sx->buffer, sizeof(sx->buffer), '2',
1852 ob->command_timeout))
1854 if (errno == 0 && sx->buffer[0] == '4')
1856 errno = ERRNO_DATA4XX; /*XXX does this actually get used? */
1857 sx->addrlist->more_errno |=
1858 ((sx->buffer[1] - '0')*10 + sx->buffer[2] - '0') << 8;
1863 sx->pending_BDAT = FALSE;
1864 pipelining_active = FALSE;
1866 else if (chunk_size > 0)
1867 sx->pending_BDAT = TRUE;
1870 sx->cmd_count = cmd_count;
1878 /*************************************************
1879 * Make connection for given message *
1880 *************************************************/
1884 ctx connection context
1885 suppress_tls if TRUE, don't attempt a TLS connection - this is set for
1886 a second attempt after TLS initialization fails
1888 Returns: OK - the connection was made and the delivery attempted;
1889 fd is set in the conn context, tls_out set up.
1890 DEFER - the connection could not be made, or something failed
1891 while setting up the SMTP session, or there was a
1892 non-message-specific error, such as a timeout.
1893 ERROR - helo_data or add_headers or authenticated_sender is
1894 specified for this transport, and the string failed
1898 smtp_setup_conn(smtp_context * sx, BOOL suppress_tls)
1900 smtp_transport_options_block * ob = sx->conn_args.tblock->options_block;
1901 BOOL pass_message = FALSE;
1902 uschar * message = NULL;
1905 uschar * tls_errstr;
1908 sx->conn_args.ob = ob;
1910 sx->lmtp = strcmpic(ob->protocol, US"lmtp") == 0;
1911 sx->smtps = strcmpic(ob->protocol, US"smtps") == 0;
1912 /* sx->ok = FALSE; */
1913 sx->send_rset = TRUE;
1914 sx->send_quit = TRUE;
1915 sx->setting_up = TRUE;
1917 /* sx->esmtp_sent = FALSE; */
1919 /* sx->utf8_needed = FALSE; */
1921 sx->dsn_all_lasthop = TRUE;
1923 /* sx->conn_args.dane = FALSE; */
1925 verify_check_given_host(CUSS &ob->hosts_require_dane, sx->conn_args.host) == OK;
1927 #ifndef DISABLE_PIPE_CONNECT
1928 /* sx->early_pipe_active = sx->early_pipe_ok = FALSE; */
1929 /* sx->ehlo_resp.cleartext_features = sx->ehlo_resp.crypted_features = 0; */
1930 /* sx->pending_BANNER = sx->pending_EHLO = sx->pending_MAIL = FALSE; */
1933 if ((sx->max_rcpt = sx->conn_args.tblock->max_addresses) == 0) sx->max_rcpt = 999999;
1934 /* sx->peer_offered = 0; */
1935 /* sx->avoid_option = 0; */
1936 sx->igquotstr = US"";
1937 if (!sx->helo_data) sx->helo_data = ob->helo_data;
1938 #ifdef EXPERIMENTAL_DSN_INFO
1939 /* sx->smtp_greeting = NULL; */
1940 /* sx->helo_response = NULL; */
1943 smtp_command = US"initial connection";
1944 /* sx->buffer[0] = '\0'; */
1946 /* Set up the buffer for reading SMTP response packets. */
1948 sx->inblock.buffer = sx->inbuffer;
1949 sx->inblock.buffersize = sizeof(sx->inbuffer);
1950 sx->inblock.ptr = sx->inbuffer;
1951 sx->inblock.ptrend = sx->inbuffer;
1953 /* Set up the buffer for holding SMTP commands while pipelining */
1955 sx->outblock.buffer = sx->outbuffer;
1956 sx->outblock.buffersize = sizeof(sx->outbuffer);
1957 sx->outblock.ptr = sx->outbuffer;
1958 /* sx->outblock.cmd_count = 0; */
1959 /* sx->outblock.authenticating = FALSE; */
1960 /* sx->outblock.conn_args = NULL; */
1962 /* Reset the parameters of a TLS session. */
1965 tls_out.cipher = NULL; /* the one we may use for this transport */
1966 tls_out.ourcert = NULL;
1967 tls_out.peercert = NULL;
1968 tls_out.peerdn = NULL;
1972 tls_out.ocsp = OCSP_NOT_REQ;
1973 #ifdef EXPERIMENTAL_TLS_RESUME
1974 tls_out.resumption = 0;
1978 /* Flip the legacy TLS-related variables over to the outbound set in case
1979 they're used in the context of the transport. Don't bother resetting
1980 afterward (when being used by a transport) as we're in a subprocess.
1981 For verify, unflipped once the callout is dealt with */
1983 tls_modify_variables(&tls_out);
1988 set_errno_nohost(sx->addrlist, ERRNO_TLSFAILURE, US"TLS support not available",
1989 DEFER, FALSE, &sx->delivery_start);
1994 /* Make a connection to the host if this isn't a continued delivery, and handle
1995 the initial interaction and HELO/EHLO/LHLO. Connect timeout errors are handled
1996 specially so they can be identified for retries. */
1998 if (!continue_hostname)
2001 HDEBUG(D_verify) debug_printf("interface=%s port=%d\n", sx->conn_args.interface, sx->port);
2003 /* Get the actual port the connection will use, into sx->conn_args.host */
2005 smtp_port_for_connect(sx->conn_args.host, sx->port);
2008 /* Do TLSA lookup for DANE */
2010 tls_out.dane_verified = FALSE;
2011 tls_out.tlsa_usage = 0;
2013 if (sx->conn_args.host->dnssec == DS_YES)
2016 if( sx->dane_required
2017 || verify_check_given_host(CUSS &ob->hosts_try_dane, sx->conn_args.host) == OK
2019 switch (rc = tlsa_lookup(sx->conn_args.host, &sx->conn_args.tlsa_dnsa, sx->dane_required))
2021 case OK: sx->conn_args.dane = TRUE;
2022 ob->tls_tempfail_tryclear = FALSE;
2024 case FAIL_FORCED: break;
2025 default: set_errno_nohost(sx->addrlist, ERRNO_DNSDEFER,
2026 string_sprintf("DANE error: tlsa lookup %s",
2028 rc, FALSE, &sx->delivery_start);
2029 # ifndef DISABLE_EVENT
2030 (void) event_raise(sx->conn_args.tblock->event_action,
2031 US"dane:fail", sx->dane_required
2032 ? US"dane-required" : US"dnssec-invalid");
2037 else if (sx->dane_required)
2039 set_errno_nohost(sx->addrlist, ERRNO_DNSDEFER,
2040 string_sprintf("DANE error: %s lookup not DNSSEC", sx->conn_args.host->name),
2041 FAIL, FALSE, &sx->delivery_start);
2042 # ifndef DISABLE_EVENT
2043 (void) event_raise(sx->conn_args.tblock->event_action,
2044 US"dane:fail", US"dane-required");
2051 /* Make the TCP connection */
2053 sx->cctx.tls_ctx = NULL;
2054 sx->inblock.cctx = sx->outblock.cctx = &sx->cctx;
2055 sx->avoid_option = sx->peer_offered = smtp_peer_options = 0;
2057 #ifndef DISABLE_PIPE_CONNECT
2058 if ( verify_check_given_host(CUSS &ob->hosts_pipe_connect,
2059 sx->conn_args.host) == OK)
2061 /* We don't find out the local ip address until the connect, so if
2062 the helo string might use it avoid doing early-pipelining. */
2065 || !Ustrstr(sx->helo_data, "$sending_ip_address")
2066 || Ustrstr(sx->helo_data, "def:sending_ip_address")
2069 sx->early_pipe_ok = TRUE;
2070 if ( read_ehlo_cache_entry(sx)
2071 && sx->ehlo_resp.cleartext_features & OPTION_EARLY_PIPE)
2074 debug_printf("Using cached cleartext PIPE_CONNECT\n");
2075 sx->early_pipe_active = TRUE;
2076 sx->peer_offered = sx->ehlo_resp.cleartext_features;
2079 else DEBUG(D_transport)
2080 debug_printf("helo needs $sending_ip_address\n");
2082 if (sx->early_pipe_active)
2083 sx->outblock.conn_args = &sx->conn_args;
2087 if ((sx->cctx.sock = smtp_connect(&sx->conn_args, NULL)) < 0)
2089 set_errno_nohost(sx->addrlist,
2090 errno == ETIMEDOUT ? ERRNO_CONNECTTIMEOUT : errno,
2091 sx->verify ? US strerror(errno) : NULL,
2092 DEFER, FALSE, &sx->delivery_start);
2093 sx->send_quit = FALSE;
2097 /* Expand the greeting message while waiting for the initial response. (Makes
2098 sense if helo_data contains ${lookup dnsdb ...} stuff). The expansion is
2099 delayed till here so that $sending_interface and $sending_port are set. */
2100 /*XXX early-pipe: they still will not be. Is there any way to find out what they
2101 will be? Somehow I doubt it. */
2104 if (!(sx->helo_data = expand_string(sx->helo_data)))
2106 log_write(0, LOG_MAIN|LOG_PANIC,
2107 "<%s>: failed to expand transport's helo_data value for callout: %s",
2108 sx->addrlist->address, expand_string_message);
2113 expand_string_message = NULL;
2114 if ((sx->helo_data = string_domain_utf8_to_alabel(sx->helo_data,
2115 &expand_string_message)),
2116 expand_string_message)
2118 log_write(0, LOG_MAIN|LOG_PANIC,
2119 "<%s>: failed to expand transport's helo_data value for callout: %s",
2120 sx->addrlist->address, expand_string_message);
2122 sx->helo_data = NULL;
2126 /* The first thing is to wait for an initial OK response. The dreaded "goto"
2127 is nevertheless a reasonably clean way of programming this kind of logic,
2128 where you want to escape on any error. */
2132 #ifndef DISABLE_PIPE_CONNECT
2133 if (sx->early_pipe_active)
2135 sx->pending_BANNER = TRUE; /* sync_responses() must eventually handle */
2136 sx->outblock.cmd_count = 1;
2142 (void) setsockopt(sx->cctx.sock, IPPROTO_TCP, TCP_QUICKACK, US &off,
2145 if (!smtp_reap_banner(sx))
2146 goto RESPONSE_FAILED;
2149 #ifndef DISABLE_EVENT
2152 lookup_dnssec_authenticated = sx->conn_args.host->dnssec==DS_YES ? US"yes"
2153 : sx->conn_args.host->dnssec==DS_NO ? US"no" : NULL;
2154 s = event_raise(sx->conn_args.tblock->event_action, US"smtp:connect", sx->buffer);
2157 set_errno_nohost(sx->addrlist, ERRNO_EXPANDFAIL,
2158 string_sprintf("deferred by smtp:connect event expansion: %s", s),
2159 DEFER, FALSE, &sx->delivery_start);
2166 /* Now check if the helo_data expansion went well, and sign off cleanly if
2171 message = string_sprintf("failed to expand helo_data: %s",
2172 expand_string_message);
2173 set_errno_nohost(sx->addrlist, ERRNO_EXPANDFAIL, message, DEFER, FALSE, &sx->delivery_start);
2179 /** Debugging without sending a message
2180 sx->addrlist->transport_return = DEFER;
2184 /* Errors that occur after this point follow an SMTP command, which is
2185 left in big_buffer by smtp_write_command() for use in error messages. */
2187 smtp_command = big_buffer;
2189 /* Tell the remote who we are...
2191 February 1998: A convention has evolved that ESMTP-speaking MTAs include the
2192 string "ESMTP" in their greeting lines, so make Exim send EHLO if the
2193 greeting is of this form. The assumption was that the far end supports it
2194 properly... but experience shows that there are some that give 5xx responses,
2195 even though the banner includes "ESMTP" (there's a bloody-minded one that
2196 says "ESMTP not spoken here"). Cope with that case.
2198 September 2000: Time has passed, and it seems reasonable now to always send
2199 EHLO at the start. It is also convenient to make the change while installing
2202 July 2003: Joachim Wieland met a broken server that advertises "PIPELINING"
2203 but times out after sending MAIL FROM, RCPT TO and DATA all together. There
2204 would be no way to send out the mails, so there is now a host list
2205 "hosts_avoid_esmtp" that disables ESMTP for special hosts and solves the
2206 PIPELINING problem as well. Maybe it can also be useful to cure other
2207 problems with broken servers.
2209 Exim originally sent "Helo" at this point and ran for nearly a year that way.
2210 Then somebody tried it with a Microsoft mailer... It seems that all other
2211 mailers use upper case for some reason (the RFC is quite clear about case
2212 independence) so, for peace of mind, I gave in. */
2214 sx->esmtp = verify_check_given_host(CUSS &ob->hosts_avoid_esmtp, sx->conn_args.host) != OK;
2216 /* Alas; be careful, since this goto is not an error-out, so conceivably
2217 we might set data between here and the target which we assume to exist
2218 and be usable. I can see this coming back to bite us. */
2222 smtp_peer_options |= OPTION_TLS;
2223 suppress_tls = FALSE;
2224 ob->tls_tempfail_tryclear = FALSE;
2225 smtp_command = US"SSL-on-connect";
2232 if (smtp_write_command(sx,
2233 #ifndef DISABLE_PIPE_CONNECT
2234 sx->early_pipe_active ? SCMD_BUFFER :
2237 "%s %s\r\n", sx->lmtp ? "LHLO" : "EHLO", sx->helo_data) < 0)
2239 sx->esmtp_sent = TRUE;
2241 #ifndef DISABLE_PIPE_CONNECT
2242 if (sx->early_pipe_active)
2244 sx->pending_EHLO = TRUE;
2246 /* If we have too many authenticators to handle and might need to AUTH
2247 for this transport, pipeline no further as we will need the
2248 list of auth methods offered. Reap the banner and EHLO. */
2250 if ( (ob->hosts_require_auth || ob->hosts_try_auth)
2251 && f.smtp_in_early_pipe_no_auth)
2253 DEBUG(D_transport) debug_printf("may need to auth, so pipeline no further\n");
2254 if (smtp_write_command(sx, SCMD_FLUSH, NULL) < 0)
2256 if (sync_responses(sx, 2, 0) != 0)
2259 debug_printf("failed reaping pipelined cmd responses\n");
2260 goto RESPONSE_FAILED;
2262 sx->early_pipe_active = FALSE;
2267 if (!smtp_reap_ehlo(sx))
2268 goto RESPONSE_FAILED;
2272 debug_printf("not sending EHLO (host matches hosts_avoid_esmtp)\n");
2274 #ifndef DISABLE_PIPE_CONNECT
2275 if (!sx->early_pipe_active)
2280 int n = sizeof(sx->buffer);
2281 uschar * rsp = sx->buffer;
2283 if (sx->esmtp_sent && (n = Ustrlen(sx->buffer)) < sizeof(sx->buffer)/2)
2284 { rsp = sx->buffer + n + 1; n = sizeof(sx->buffer) - n; }
2286 if (smtp_write_command(sx, SCMD_FLUSH, "HELO %s\r\n", sx->helo_data) < 0)
2288 good_response = smtp_read_response(sx, rsp, n, '2', ob->command_timeout);
2289 #ifdef EXPERIMENTAL_DSN_INFO
2290 sx->helo_response = string_copy(rsp);
2294 /* Handle special logging for a closed connection after HELO
2295 when had previously sent EHLO */
2297 if (rsp != sx->buffer && rsp[0] == 0 && (errno == 0 || errno == ECONNRESET))
2299 errno = ERRNO_SMTPCLOSED;
2300 goto EHLOHELO_FAILED;
2302 memmove(sx->buffer, rsp, Ustrlen(rsp));
2303 goto RESPONSE_FAILED;
2307 if (sx->esmtp || sx->lmtp)
2309 #ifndef DISABLE_PIPE_CONNECT
2310 if (!sx->early_pipe_active)
2313 sx->peer_offered = ehlo_response(sx->buffer,
2314 OPTION_TLS /* others checked later */
2315 #ifndef DISABLE_PIPE_CONNECT
2316 | (sx->early_pipe_ok
2318 | OPTION_CHUNKING | OPTION_PRDR | OPTION_DSN | OPTION_PIPE | OPTION_SIZE
2327 #ifndef DISABLE_PIPE_CONNECT
2328 if (sx->early_pipe_ok)
2330 sx->ehlo_resp.cleartext_features = sx->peer_offered;
2332 if ( (sx->peer_offered & (OPTION_PIPE | OPTION_EARLY_PIPE))
2333 == (OPTION_PIPE | OPTION_EARLY_PIPE))
2335 DEBUG(D_transport) debug_printf("PIPE_CONNECT usable in future for this IP\n");
2336 sx->ehlo_resp.cleartext_auths = study_ehlo_auths(sx);
2337 write_ehlo_cache_entry(sx);
2343 /* Set tls_offered if the response to EHLO specifies support for STARTTLS. */
2346 smtp_peer_options |= sx->peer_offered & OPTION_TLS;
2351 /* For continuing deliveries down the same channel, having re-exec'd the socket
2352 is the standard input; for a socket held open from verify it is recorded
2353 in the cutthrough context block. Either way we don't need to redo EHLO here
2354 (but may need to do so for TLS - see below).
2355 Set up the pointer to where subsequent commands will be left, for
2356 error messages. Note that smtp_peer_options will have been
2357 set from the command line if they were set in the process that passed the
2360 /*XXX continue case needs to propagate DSN_INFO, prob. in deliver.c
2361 as the continue goes via transport_pass_socket() and doublefork and exec.
2362 It does not wait. Unclear how we keep separate host's responses
2363 separate - we could match up by host ip+port as a bodge. */
2367 if (cutthrough.cctx.sock >= 0 && cutthrough.callout_hold_only)
2369 sx->cctx = cutthrough.cctx;
2370 sx->conn_args.host->port = sx->port = cutthrough.host.port;
2374 sx->cctx.sock = 0; /* stdin */
2375 sx->cctx.tls_ctx = NULL;
2376 smtp_port_for_connect(sx->conn_args.host, sx->port); /* Record the port that was used */
2378 sx->inblock.cctx = sx->outblock.cctx = &sx->cctx;
2379 smtp_command = big_buffer;
2380 sx->peer_offered = smtp_peer_options;
2381 sx->helo_data = NULL; /* ensure we re-expand ob->helo_data */
2383 /* For a continued connection with TLS being proxied for us, or a
2384 held-open verify connection with TLS, nothing more to do. */
2386 if ( continue_proxy_cipher
2387 || (cutthrough.cctx.sock >= 0 && cutthrough.callout_hold_only
2388 && cutthrough.is_tls)
2391 sx->pipelining_used = pipelining_active = !!(smtp_peer_options & OPTION_PIPE);
2392 HDEBUG(D_transport) debug_printf("continued connection, %s TLS\n",
2393 continue_proxy_cipher ? "proxied" : "verify conn with");
2396 HDEBUG(D_transport) debug_printf("continued connection, no TLS\n");
2399 /* If TLS is available on this connection, whether continued or not, attempt to
2400 start up a TLS session, unless the host is in hosts_avoid_tls. If successful,
2401 send another EHLO - the server may give a different answer in secure mode. We
2402 use a separate buffer for reading the response to STARTTLS so that if it is
2403 negative, the original EHLO data is available for subsequent analysis, should
2404 the client not be required to use TLS. If the response is bad, copy the buffer
2405 for error analysis. */
2408 if ( smtp_peer_options & OPTION_TLS
2410 && verify_check_given_host(CUSS &ob->hosts_avoid_tls, sx->conn_args.host) != OK
2412 || verify_check_given_host(CUSS &ob->hosts_verify_avoid_tls, sx->conn_args.host) != OK
2415 uschar buffer2[4096];
2417 if (smtp_write_command(sx, SCMD_FLUSH, "STARTTLS\r\n") < 0)
2420 #ifndef DISABLE_PIPE_CONNECT
2421 /* If doing early-pipelining reap the banner and EHLO-response but leave
2422 the response for the STARTTLS we just sent alone. */
2424 if (sx->early_pipe_active && sync_responses(sx, 2, 0) != 0)
2427 debug_printf("failed reaping pipelined cmd responses\n");
2428 goto RESPONSE_FAILED;
2432 /* If there is an I/O error, transmission of this message is deferred. If
2433 there is a temporary rejection of STARRTLS and tls_tempfail_tryclear is
2434 false, we also defer. However, if there is a temporary rejection of STARTTLS
2435 and tls_tempfail_tryclear is true, or if there is an outright rejection of
2436 STARTTLS, we carry on. This means we will try to send the message in clear,
2437 unless the host is in hosts_require_tls (tested below). */
2439 if (!smtp_read_response(sx, buffer2, sizeof(buffer2), '2', ob->command_timeout))
2443 || (buffer2[0] == '4' && !ob->tls_tempfail_tryclear)
2446 Ustrncpy(sx->buffer, buffer2, sizeof(sx->buffer));
2447 sx->buffer[sizeof(sx->buffer)-1] = '\0';
2448 goto RESPONSE_FAILED;
2452 /* STARTTLS accepted: try to negotiate a TLS session. */
2457 if (!tls_client_start(&sx->cctx, &sx->conn_args, sx->addrlist, &tls_out, &tls_errstr))
2459 /* TLS negotiation failed; give an error. From outside, this function may
2460 be called again to try in clear on a new connection, if the options permit
2461 it for this host. */
2465 DEBUG(D_tls) debug_printf("TLS session fail: %s\n", tls_errstr);
2467 # ifdef SUPPORT_DANE
2468 if (sx->conn_args.dane)
2470 log_write(0, LOG_MAIN,
2471 "DANE attempt failed; TLS connection to %s [%s]: %s",
2472 sx->conn_args.host->name, sx->conn_args.host->address, tls_errstr);
2473 # ifndef DISABLE_EVENT
2474 (void) event_raise(sx->conn_args.tblock->event_action,
2475 US"dane:fail", US"validation-failure"); /* could do with better detail */
2480 errno = ERRNO_TLSFAILURE;
2481 message = string_sprintf("TLS session: %s", tls_errstr);
2482 sx->send_quit = FALSE;
2486 /* TLS session is set up */
2488 smtp_peer_options_wrap = smtp_peer_options;
2489 for (address_item * addr = sx->addrlist; addr; addr = addr->next)
2490 if (addr->transport_return == PENDING_DEFER)
2492 addr->cipher = tls_out.cipher;
2493 addr->ourcert = tls_out.ourcert;
2494 addr->peercert = tls_out.peercert;
2495 addr->peerdn = tls_out.peerdn;
2496 addr->ocsp = tls_out.ocsp;
2497 addr->tlsver = tls_out.ver;
2502 /* if smtps, we'll have smtp_command set to something else; always safe to
2504 smtp_command = big_buffer;
2506 /* If we started TLS, redo the EHLO/LHLO exchange over the secure channel. If
2507 helo_data is null, we are dealing with a connection that was passed from
2508 another process, and so we won't have expanded helo_data above. We have to
2509 expand it here. $sending_ip_address and $sending_port are set up right at the
2510 start of the Exim process (in exim.c). */
2512 if (tls_out.active.sock >= 0)
2514 uschar * greeting_cmd;
2516 if (!sx->helo_data && !(sx->helo_data = expand_string(ob->helo_data)))
2518 uschar *message = string_sprintf("failed to expand helo_data: %s",
2519 expand_string_message);
2520 set_errno_nohost(sx->addrlist, ERRNO_EXPANDFAIL, message, DEFER, FALSE, &sx->delivery_start);
2525 #ifndef DISABLE_PIPE_CONNECT
2526 /* For SMTPS there is no cleartext early-pipe; use the crypted permission bit.
2527 We're unlikely to get the group sent and delivered before the server sends its
2528 banner, but it's still worth sending as a group.
2529 For STARTTLS allow for cleartext early-pipe but no crypted early-pipe, but not
2532 if (sx->smtps ? sx->early_pipe_ok : sx->early_pipe_active)
2534 sx->peer_offered = sx->ehlo_resp.crypted_features;
2535 if ((sx->early_pipe_active =
2536 !!(sx->ehlo_resp.crypted_features & OPTION_EARLY_PIPE)))
2537 DEBUG(D_transport) debug_printf("Using cached crypted PIPE_CONNECT\n");
2541 /* For SMTPS we need to wait for the initial OK response. */
2543 #ifndef DISABLE_PIPE_CONNECT
2544 if (sx->early_pipe_active)
2546 sx->pending_BANNER = TRUE;
2547 sx->outblock.cmd_count = 1;
2551 if (!smtp_reap_banner(sx))
2552 goto RESPONSE_FAILED;
2555 greeting_cmd = US"LHLO";
2557 greeting_cmd = US"EHLO";
2560 greeting_cmd = US"HELO";
2562 debug_printf("not sending EHLO (host matches hosts_avoid_esmtp)\n");
2565 if (smtp_write_command(sx,
2566 #ifndef DISABLE_PIPE_CONNECT
2567 sx->early_pipe_active ? SCMD_BUFFER :
2570 "%s %s\r\n", greeting_cmd, sx->helo_data) < 0)
2573 #ifndef DISABLE_PIPE_CONNECT
2574 if (sx->early_pipe_active)
2575 sx->pending_EHLO = TRUE;
2579 if (!smtp_reap_ehlo(sx))
2582 /* The GnuTLS layer in Exim only spots a server-rejection of a client
2583 cert late, under TLS1.3 - which means here; the first time we try to
2584 receive crypted data. Treat it as if it was a connect-time failure.
2585 See also the early-pipe equivalent... which will be hard; every call
2586 to sync_responses will need to check the result.
2587 It would be nicer to have GnuTLS check the cert during the handshake.
2588 Can it do that, with all the flexibility we need? */
2590 tls_errstr = US"error on first read";
2591 goto GNUTLS_CONN_FAILED;
2594 goto RESPONSE_FAILED;
2596 smtp_peer_options = 0;
2600 /* If the host is required to use a secure channel, ensure that we
2604 # ifdef SUPPORT_DANE
2605 || sx->conn_args.dane
2607 || verify_check_given_host(CUSS &ob->hosts_require_tls, sx->conn_args.host) == OK
2610 errno = ERRNO_TLSREQUIRED;
2611 message = string_sprintf("a TLS session is required, but %s",
2612 smtp_peer_options & OPTION_TLS
2613 ? "an attempt to start TLS failed" : "the server did not offer TLS support");
2614 # if defined(SUPPORT_DANE) && !defined(DISABLE_EVENT)
2615 if (sx->conn_args.dane)
2616 (void) event_raise(sx->conn_args.tblock->event_action, US"dane:fail",
2617 smtp_peer_options & OPTION_TLS
2618 ? US"validation-failure" /* could do with better detail */
2619 : US"starttls-not-supported");
2623 #endif /*DISABLE_TLS*/
2625 /* If TLS is active, we have just started it up and re-done the EHLO command,
2626 so its response needs to be analyzed. If TLS is not active and this is a
2627 continued session down a previously-used socket, we haven't just done EHLO, so
2630 if (continue_hostname == NULL
2632 || tls_out.active.sock >= 0
2636 if (sx->esmtp || sx->lmtp)
2638 #ifndef DISABLE_PIPE_CONNECT
2639 if (!sx->early_pipe_active)
2642 sx->peer_offered = ehlo_response(sx->buffer,
2644 #ifndef DISABLE_PIPE_CONNECT
2645 | (sx->lmtp && ob->lmtp_ignore_quota ? OPTION_IGNQ : 0)
2646 | OPTION_DSN | OPTION_PIPE | OPTION_SIZE
2647 | OPTION_CHUNKING | OPTION_PRDR | OPTION_UTF8
2648 | (tls_out.active.sock >= 0 ? OPTION_EARLY_PIPE : 0) /* not for lmtp */
2652 | (sx->lmtp && ob->lmtp_ignore_quota ? OPTION_IGNQ : 0)
2655 # ifdef SUPPORT_I18N
2656 | (sx->addrlist->prop.utf8_msg ? OPTION_UTF8 : 0)
2657 /*XXX if we hand peercaps on to continued-conn processes,
2658 must not depend on this addr */
2662 | (ob->size_addition >= 0 ? OPTION_SIZE : 0)
2665 #ifndef DISABLE_PIPE_CONNECT
2666 if (tls_out.active.sock >= 0)
2667 sx->ehlo_resp.crypted_features = sx->peer_offered;
2671 /* Set for IGNOREQUOTA if the response to LHLO specifies support and the
2672 lmtp_ignore_quota option was set. */
2674 sx->igquotstr = sx->peer_offered & OPTION_IGNQ ? US" IGNOREQUOTA" : US"";
2676 /* If the response to EHLO specified support for the SIZE parameter, note
2677 this, provided size_addition is non-negative. */
2679 smtp_peer_options |= sx->peer_offered & OPTION_SIZE;
2681 /* Note whether the server supports PIPELINING. If hosts_avoid_esmtp matched
2682 the current host, esmtp will be false, so PIPELINING can never be used. If
2683 the current host matches hosts_avoid_pipelining, don't do it. */
2685 if ( sx->peer_offered & OPTION_PIPE
2686 && verify_check_given_host(CUSS &ob->hosts_avoid_pipelining, sx->conn_args.host) != OK)
2687 smtp_peer_options |= OPTION_PIPE;
2689 DEBUG(D_transport) debug_printf("%susing PIPELINING\n",
2690 smtp_peer_options & OPTION_PIPE ? "" : "not ");
2692 if ( sx->peer_offered & OPTION_CHUNKING
2693 && verify_check_given_host(CUSS &ob->hosts_try_chunking, sx->conn_args.host) != OK)
2694 sx->peer_offered &= ~OPTION_CHUNKING;
2696 if (sx->peer_offered & OPTION_CHUNKING)
2697 DEBUG(D_transport) debug_printf("CHUNKING usable\n");
2699 #ifndef DISABLE_PRDR
2700 if ( sx->peer_offered & OPTION_PRDR
2701 && verify_check_given_host(CUSS &ob->hosts_try_prdr, sx->conn_args.host) != OK)
2702 sx->peer_offered &= ~OPTION_PRDR;
2704 if (sx->peer_offered & OPTION_PRDR)
2705 DEBUG(D_transport) debug_printf("PRDR usable\n");
2708 /* Note if the server supports DSN */
2709 smtp_peer_options |= sx->peer_offered & OPTION_DSN;
2710 DEBUG(D_transport) debug_printf("%susing DSN\n",
2711 sx->peer_offered & OPTION_DSN ? "" : "not ");
2713 #ifndef DISABLE_PIPE_CONNECT
2714 if ( sx->early_pipe_ok
2715 && !sx->early_pipe_active
2716 && tls_out.active.sock >= 0
2717 && smtp_peer_options & OPTION_PIPE
2718 && ( sx->ehlo_resp.cleartext_features | sx->ehlo_resp.crypted_features)
2719 & OPTION_EARLY_PIPE)
2721 DEBUG(D_transport) debug_printf("PIPE_CONNECT usable in future for this IP\n");
2722 sx->ehlo_resp.crypted_auths = study_ehlo_auths(sx);
2723 write_ehlo_cache_entry(sx);
2727 /* Note if the response to EHLO specifies support for the AUTH extension.
2728 If it has, check that this host is one we want to authenticate to, and do
2729 the business. The host name and address must be available when the
2730 authenticator's client driver is running. */
2732 switch (yield = smtp_auth(sx))
2734 default: goto SEND_QUIT;
2736 case FAIL_SEND: goto SEND_FAILED;
2737 case FAIL: goto RESPONSE_FAILED;
2741 sx->pipelining_used = pipelining_active = !!(smtp_peer_options & OPTION_PIPE);
2743 /* The setting up of the SMTP call is now complete. Any subsequent errors are
2744 message-specific. */
2746 sx->setting_up = FALSE;
2749 if (sx->addrlist->prop.utf8_msg)
2753 /* If the transport sets a downconversion mode it overrides any set by ACL
2756 if ((s = ob->utf8_downconvert))
2758 if (!(s = expand_string(s)))
2760 message = string_sprintf("failed to expand utf8_downconvert: %s",
2761 expand_string_message);
2762 set_errno_nohost(sx->addrlist, ERRNO_EXPANDFAIL, message, DEFER, FALSE, &sx->delivery_start);
2768 case '1': sx->addrlist->prop.utf8_downcvt = TRUE;
2769 sx->addrlist->prop.utf8_downcvt_maybe = FALSE;
2771 case '0': sx->addrlist->prop.utf8_downcvt = FALSE;
2772 sx->addrlist->prop.utf8_downcvt_maybe = FALSE;
2774 case '-': if (s[1] == '1')
2776 sx->addrlist->prop.utf8_downcvt = FALSE;
2777 sx->addrlist->prop.utf8_downcvt_maybe = TRUE;
2783 sx->utf8_needed = !sx->addrlist->prop.utf8_downcvt
2784 && !sx->addrlist->prop.utf8_downcvt_maybe;
2785 DEBUG(D_transport) if (!sx->utf8_needed)
2786 debug_printf("utf8: %s downconvert\n",
2787 sx->addrlist->prop.utf8_downcvt ? "mandatory" : "optional");
2790 /* If this is an international message we need the host to speak SMTPUTF8 */
2791 if (sx->utf8_needed && !(sx->peer_offered & OPTION_UTF8))
2793 errno = ERRNO_UTF8_FWD;
2794 goto RESPONSE_FAILED;
2796 #endif /*SUPPORT_I18N*/
2805 if (errno == ECONNREFUSED) /* first-read error on a TFO conn */
2807 /* There is a testing facility for simulating a connection timeout, as I
2808 can't think of any other way of doing this. It converts a connection
2809 refused into a timeout if the timeout is set to 999999. This is done for
2810 a 3whs connection in ip_connect(), but a TFO connection does not error
2811 there - instead it gets ECONNREFUSED on the first data read. Tracking
2812 that a TFO really was done is too hard, or we would set a
2813 sx->pending_conn_done bit and test that in smtp_reap_banner() and
2814 smtp_reap_ehlo(). That would let us also add the conn-timeout to the
2817 if (f.running_in_test_harness && ob->connect_timeout == 999999)
2819 set_errno_nohost(sx->addrlist,
2820 errno == ETIMEDOUT ? ERRNO_CONNECTTIMEOUT : errno,
2821 sx->verify ? US strerror(errno) : NULL,
2822 DEFER, FALSE, &sx->delivery_start);
2823 sx->send_quit = FALSE;
2827 /* really an error on an SMTP read */
2829 sx->send_quit = check_response(sx->conn_args.host, &errno, sx->addrlist->more_errno,
2830 sx->buffer, &code, &message, &pass_message);
2836 message = US string_sprintf("send() to %s [%s] failed: %s",
2837 sx->conn_args.host->name, sx->conn_args.host->address, strerror(errno));
2838 sx->send_quit = FALSE;
2844 message = string_sprintf("Remote host closed connection in response to %s"
2845 " (EHLO response was: %s)", smtp_command, sx->buffer);
2846 sx->send_quit = FALSE;
2850 /* This label is jumped to directly when a TLS negotiation has failed,
2851 or was not done for a host for which it is required. Values will be set
2852 in message and errno, and setting_up will always be true. Treat as
2853 a temporary error. */
2857 code = '4', yield = DEFER;
2861 /* The failure happened while setting up the call; see if the failure was
2862 a 5xx response (this will either be on connection, or following HELO - a 5xx
2863 after EHLO causes it to try HELO). If so, and there are no more hosts to try,
2864 fail all addresses, as this host is never going to accept them. For other
2865 errors during setting up (timeouts or whatever), defer all addresses, and
2866 yield DEFER, so that the host is not tried again for a while.
2868 XXX This peeking for another host feels like a layering violation. We want
2869 to note the host as unusable, but down here we shouldn't know if this was
2870 the last host to try for the addr(list). Perhaps the upper layer should be
2871 the one to do set_errno() ? The problem is that currently the addr is where
2872 errno etc. are stashed, but until we run out of hosts to try the errors are
2873 host-specific. Maybe we should enhance the host_item definition? */
2876 sx->ok = FALSE; /* For when reached by GOTO */
2877 set_errno(sx->addrlist, errno, message,
2878 sx->conn_args.host->next
2882 || errno == ERRNO_UTF8_FWD
2886 errno == ECONNREFUSED ? NULL : sx->conn_args.host,
2887 #ifdef EXPERIMENTAL_DSN_INFO
2888 sx->smtp_greeting, sx->helo_response,
2890 &sx->delivery_start);
2897 (void)smtp_write_command(sx, SCMD_FLUSH, "QUIT\r\n");
2900 if (sx->cctx.tls_ctx)
2902 tls_close(sx->cctx.tls_ctx, TLS_SHUTDOWN_NOWAIT);
2903 sx->cctx.tls_ctx = NULL;
2907 /* Close the socket, and return the appropriate value, first setting
2908 works because the NULL setting is passed back to the calling process, and
2909 remote_max_parallel is forced to 1 when delivering over an existing connection,
2912 HDEBUG(D_transport|D_acl|D_v) debug_printf_indent(" SMTP(close)>>\n");
2915 shutdown(sx->cctx.sock, SHUT_WR);
2916 if (fcntl(sx->cctx.sock, F_SETFL, O_NONBLOCK) == 0)
2917 for (int i = 16; read(sx->cctx.sock, sx->inbuffer, sizeof(sx->inbuffer)) > 0 && i > 0;)
2918 i--; /* drain socket */
2919 sx->send_quit = FALSE;
2921 (void)close(sx->cctx.sock);
2924 #ifndef DISABLE_EVENT
2925 (void) event_raise(sx->conn_args.tblock->event_action, US"tcp:close", NULL);
2928 continue_transport = NULL;
2929 continue_hostname = NULL;
2936 /* Create the string of options that will be appended to the MAIL FROM:
2937 in the connection context buffer */
2940 build_mailcmd_options(smtp_context * sx, address_item * addrlist)
2942 uschar * p = sx->buffer;
2943 address_item * addr;
2948 /* If we know the receiving MTA supports the SIZE qualification, and we know it,
2949 send it, adding something to the message size to allow for imprecision
2950 and things that get added en route. Exim keeps the number of lines
2951 in a message, so we can give an accurate value for the original message, but we
2952 need some additional to handle added headers. (Double "." characters don't get
2953 included in the count.) */
2955 if ( message_size > 0
2956 && sx->peer_offered & OPTION_SIZE && !(sx->avoid_option & OPTION_SIZE))
2958 /*XXX problem here under spool_files_wireformat?
2959 Or just forget about lines? Or inflate by a fixed proportion? */
2961 sprintf(CS p, " SIZE=%d", message_size+message_linecount+(SOB sx->conn_args.ob)->size_addition);
2965 #ifndef DISABLE_PRDR
2966 /* If it supports Per-Recipient Data Responses, and we have more than one recipient,
2969 sx->prdr_active = FALSE;
2970 if (sx->peer_offered & OPTION_PRDR)
2971 for (address_item * addr = addrlist; addr; addr = addr->next)
2972 if (addr->transport_return == PENDING_DEFER)
2974 for (addr = addr->next; addr; addr = addr->next)
2975 if (addr->transport_return == PENDING_DEFER)
2976 { /* at least two recipients to send */
2977 sx->prdr_active = TRUE;
2978 sprintf(CS p, " PRDR"); p += 5;
2986 /* If it supports internationalised messages, and this meesage need that,
2989 if ( sx->peer_offered & OPTION_UTF8
2990 && addrlist->prop.utf8_msg
2991 && !addrlist->prop.utf8_downcvt
2993 Ustrcpy(p, US" SMTPUTF8"), p += 9;
2996 /* check if all addresses have DSN-lasthop flag; do not send RET and ENVID if so */
2997 for (sx->dsn_all_lasthop = TRUE, addr = addrlist, address_count = 0;
2998 addr && address_count < sx->max_rcpt;
2999 addr = addr->next) if (addr->transport_return == PENDING_DEFER)
3002 if (!(addr->dsn_flags & rf_dsnlasthop))
3004 sx->dsn_all_lasthop = FALSE;
3009 /* Add any DSN flags to the mail command */
3011 if (sx->peer_offered & OPTION_DSN && !sx->dsn_all_lasthop)
3013 if (dsn_ret == dsn_ret_hdrs)
3014 { Ustrcpy(p, US" RET=HDRS"); p += 9; }
3015 else if (dsn_ret == dsn_ret_full)
3016 { Ustrcpy(p, US" RET=FULL"); p += 9; }
3020 string_format(p, sizeof(sx->buffer) - (p-sx->buffer), " ENVID=%s", dsn_envid);
3025 /* If an authenticated_sender override has been specified for this transport
3026 instance, expand it. If the expansion is forced to fail, and there was already
3027 an authenticated_sender for this message, the original value will be used.
3028 Other expansion failures are serious. An empty result is ignored, but there is
3029 otherwise no check - this feature is expected to be used with LMTP and other
3030 cases where non-standard addresses (e.g. without domains) might be required. */
3032 return smtp_mail_auth_str(sx, p, addrlist) ? ERROR : OK;
3037 build_rcptcmd_options(smtp_context * sx, const address_item * addr)
3039 uschar * p = sx->buffer;
3042 /* Add any DSN flags to the rcpt command */
3044 if (sx->peer_offered & OPTION_DSN && !(addr->dsn_flags & rf_dsnlasthop))
3046 if (addr->dsn_flags & rf_dsnflags)
3050 Ustrcpy(p, US" NOTIFY=");
3052 for (int i = 0; i < nelem(rf_list); i++) if (addr->dsn_flags & rf_list[i])
3054 if (!first) *p++ = ',';
3056 Ustrcpy(p, rf_names[i]);
3061 if (addr->dsn_orcpt)
3063 string_format(p, sizeof(sx->buffer) - (p-sx->buffer), " ORCPT=%s",
3074 0 good, rcpt results in addr->transport_return (PENDING_OK, DEFER, FAIL)
3075 -1 MAIL response error
3076 -2 any non-MAIL read i/o error
3077 -3 non-MAIL response timeout
3078 -4 internal error; channel still usable
3083 smtp_write_mail_and_rcpt_cmds(smtp_context * sx, int * yield)
3085 address_item * addr;
3086 int address_count, pipe_limit;
3089 if (build_mailcmd_options(sx, sx->first_addr) != OK)
3095 /* From here until we send the DATA command, we can make use of PIPELINING
3096 if the server host supports it. The code has to be able to check the responses
3097 at any point, for when the buffer fills up, so we write it totally generally.
3098 When PIPELINING is off, each command written reports that it has flushed the
3101 sx->pending_MAIL = TRUE; /* The block starts with MAIL */
3104 uschar * s = sx->from_addr;
3106 uschar * errstr = NULL;
3108 /* If we must downconvert, do the from-address here. Remember we had to
3109 for the to-addresses (done below), and also (ugly) for re-doing when building
3110 the delivery log line. */
3112 if ( sx->addrlist->prop.utf8_msg
3113 && (sx->addrlist->prop.utf8_downcvt || !(sx->peer_offered & OPTION_UTF8))
3116 if (s = string_address_utf8_to_alabel(s, &errstr), errstr)
3118 set_errno_nohost(sx->addrlist, ERRNO_EXPANDFAIL, errstr, DEFER, FALSE, &sx->delivery_start);
3122 setflag(sx->addrlist, af_utf8_downcvt);
3126 rc = smtp_write_command(sx, pipelining_active ? SCMD_BUFFER : SCMD_FLUSH,
3127 "MAIL FROM:<%s>%s\r\n", s, sx->buffer);
3130 mail_command = string_copy(big_buffer); /* Save for later error message */
3134 case -1: /* Transmission error */
3137 case +1: /* Cmd was sent */
3138 if (!smtp_read_response(sx, sx->buffer, sizeof(sx->buffer), '2',
3139 (SOB sx->conn_args.ob)->command_timeout))
3141 if (errno == 0 && sx->buffer[0] == '4')
3143 errno = ERRNO_MAIL4XX;
3144 sx->addrlist->more_errno |= ((sx->buffer[1] - '0')*10 + sx->buffer[2] - '0') << 8;
3148 sx->pending_MAIL = FALSE;
3151 /* otherwise zero: command queued for pipeline */
3154 /* Pass over all the relevant recipient addresses for this host, which are the
3155 ones that have status PENDING_DEFER. If we are using PIPELINING, we can send
3156 several before we have to read the responses for those seen so far. This
3157 checking is done by a subroutine because it also needs to be done at the end.
3158 Send only up to max_rcpt addresses at a time, leaving next_addr pointing to
3159 the next one if not all are sent.
3161 In the MUA wrapper situation, we want to flush the PIPELINING buffer for the
3162 last address because we want to abort if any recipients have any kind of
3163 problem, temporary or permanent. We know that all recipient addresses will have
3164 the PENDING_DEFER status, because only one attempt is ever made, and we know
3165 that max_rcpt will be large, so all addresses will be done at once.
3167 For verify we flush the pipeline after any (the only) rcpt address. */
3169 for (addr = sx->first_addr, address_count = 0, pipe_limit = 100;
3170 addr && address_count < sx->max_rcpt;
3171 addr = addr->next) if (addr->transport_return == PENDING_DEFER)
3177 addr->dsn_aware = sx->peer_offered & OPTION_DSN
3178 ? dsn_support_yes : dsn_support_no;
3181 if (pipe_limit-- <= 0)
3182 { no_flush = FALSE; pipe_limit = 100; }
3184 no_flush = pipelining_active && !sx->verify
3185 && (!mua_wrapper || addr->next && address_count < sx->max_rcpt);
3187 build_rcptcmd_options(sx, addr);
3189 /* Now send the RCPT command, and process outstanding responses when
3190 necessary. After a timeout on RCPT, we just end the function, leaving the
3191 yield as OK, because this error can often mean that there is a problem with
3192 just one address, so we don't want to delay the host. */
3194 rcpt_addr = transport_rcpt_address(addr, sx->conn_args.tblock->rcpt_include_affixes);
3197 if ( testflag(sx->addrlist, af_utf8_downcvt)
3198 && !(rcpt_addr = string_address_utf8_to_alabel(rcpt_addr, NULL))
3201 /*XXX could we use a per-address errstr here? Not fail the whole send? */
3202 errno = ERRNO_EXPANDFAIL;
3203 return -5; /*XXX too harsh? */
3207 cmds_sent = smtp_write_command(sx, no_flush ? SCMD_BUFFER : SCMD_FLUSH,
3208 "RCPT TO:<%s>%s%s\r\n", rcpt_addr, sx->igquotstr, sx->buffer);
3210 if (cmds_sent < 0) return -5;
3213 switch(sync_responses(sx, cmds_sent, 0))
3215 case 3: sx->ok = TRUE; /* 2xx & 5xx => OK & progress made */
3216 case 2: sx->completed_addr = TRUE; /* 5xx (only) => progress made */
3219 case 1: sx->ok = TRUE; /* 2xx (only) => OK, but if LMTP, */
3220 if (!sx->lmtp) /* can't tell about progress yet */
3221 sx->completed_addr = TRUE;
3222 case 0: /* No 2xx or 5xx, but no probs */
3223 /* If any RCPT got a 452 response then next_addr has been updated
3224 for restarting with a new MAIL on the same connection. Send no more
3225 RCPTs for this MAIL. */
3229 DEBUG(D_transport) debug_printf("seen 452 too-many-rcpts\n");
3230 sx->RCPT_452 = FALSE;
3231 /* sx->next_addr has been reset for fast_retry */
3236 case -1: return -3; /* Timeout on RCPT */
3237 case -2: return -2; /* non-MAIL read i/o error */
3238 default: return -1; /* any MAIL error */
3240 #ifndef DISABLE_PIPE_CONNECT
3241 case -4: return -1; /* non-2xx for pipelined banner or EHLO */
3242 case -5: return -1; /* TLS first-read error */
3246 } /* Loop for next address */
3248 sx->next_addr = addr;
3254 /*****************************************************
3255 * Proxy TLS connection for another transport process *
3256 ******************************************************/
3258 Close the unused end of the pipe, fork once more, then use the given buffer
3259 as a staging area, and select on both the given fd and the TLS'd client-fd for
3260 data to read (per the coding in ip_recv() and fd_ready() this is legitimate).
3261 Do blocking full-size writes, and reads under a timeout. Once both input
3262 channels are closed, exit the process.
3266 buf space to use for buffering
3267 bufsiz size of buffer
3268 pfd pipe filedescriptor array; [0] is comms to proxied process
3269 timeout per-read timeout, seconds
3275 smtp_proxy_tls(void * ct_ctx, uschar * buf, size_t bsize, int * pfd,
3279 int max_fd = MAX(pfd[0], tls_out.active.sock) + 1;
3285 DEBUG(D_transport) debug_printf("proxy-proc final-pid %d\n", rc);
3286 _exit(rc < 0 ? EXIT_FAILURE : EXIT_SUCCESS);
3289 testharness_pause_ms(100); /* let parent debug out */
3290 set_process_info("proxying TLS connection for continued transport");
3292 FD_SET(tls_out.active.sock, &rfds);
3293 FD_SET(pfd[0], &rfds);
3295 for (int fd_bits = 3; fd_bits; )
3297 time_t time_left = timeout;
3298 time_t time_start = time(NULL);
3304 struct timeval tv = { time_left, 0 };
3307 (SELECT_ARG2_TYPE *)&rfds, NULL, (SELECT_ARG2_TYPE *)&efds, &tv);
3309 if (rc < 0 && errno == EINTR)
3310 if ((time_left -= time(NULL) - time_start) > 0) continue;
3314 DEBUG(D_transport) if (rc == 0) debug_printf("%s: timed out\n", __FUNCTION__);
3318 if (FD_ISSET(tls_out.active.sock, &efds) || FD_ISSET(pfd[0], &efds))
3320 DEBUG(D_transport) debug_printf("select: exceptional cond on %s fd\n",
3321 FD_ISSET(pfd[0], &efds) ? "proxy" : "tls");
3325 while (rc < 0 || !(FD_ISSET(tls_out.active.sock, &rfds) || FD_ISSET(pfd[0], &rfds)));
3327 /* handle inbound data */
3328 if (FD_ISSET(tls_out.active.sock, &rfds))
3329 if ((rc = tls_read(ct_ctx, buf, bsize)) <= 0)
3332 FD_CLR(tls_out.active.sock, &rfds);
3333 shutdown(pfd[0], SHUT_WR);
3338 for (int nbytes = 0; rc - nbytes > 0; nbytes += i)
3339 if ((i = write(pfd[0], buf + nbytes, rc - nbytes)) < 0) goto done;
3341 else if (fd_bits & 1)
3342 FD_SET(tls_out.active.sock, &rfds);
3344 /* handle outbound data */
3345 if (FD_ISSET(pfd[0], &rfds))
3346 if ((rc = read(pfd[0], buf, bsize)) <= 0)
3349 tls_close(ct_ctx, TLS_SHUTDOWN_NOWAIT);
3354 for (int nbytes = 0; rc - nbytes > 0; nbytes += i)
3355 if ((i = tls_write(ct_ctx, buf + nbytes, rc - nbytes, FALSE)) < 0)
3358 else if (fd_bits & 2)
3359 FD_SET(pfd[0], &rfds);
3363 testharness_pause_ms(100); /* let logging complete */
3364 exim_exit(0, US"TLS proxy");
3369 /*************************************************
3370 * Deliver address list to given host *
3371 *************************************************/
3373 /* If continue_hostname is not null, we get here only when continuing to
3374 deliver down an existing channel. The channel was passed as the standard
3375 input. TLS is never active on a passed channel; the previous process always
3376 closes it down before passing the connection on.
3378 Otherwise, we have to make a connection to the remote host, and do the
3379 initial protocol exchange.
3381 When running as an MUA wrapper, if the sender or any recipient is rejected,
3382 temporarily or permanently, we force failure for all recipients.
3385 addrlist chain of potential addresses to deliver; only those whose
3386 transport_return field is set to PENDING_DEFER are currently
3387 being processed; others should be skipped - they have either
3388 been delivered to an earlier host or IP address, or been
3389 failed by one of them.
3390 host host to deliver to
3391 host_af AF_INET or AF_INET6
3392 defport default TCP/IP port to use if host does not specify, in host
3394 interface interface to bind to, or NULL
3395 tblock transport instance block
3396 message_defer set TRUE if yield is OK, but all addresses were deferred
3397 because of a non-recipient, non-host failure, that is, a
3398 4xx response to MAIL FROM, DATA, or ".". This is a defer
3399 that is specific to the message.
3400 suppress_tls if TRUE, don't attempt a TLS connection - this is set for
3401 a second attempt after TLS initialization fails
3403 Returns: OK - the connection was made and the delivery attempted;
3404 the result for each address is in its data block.
3405 DEFER - the connection could not be made, or something failed
3406 while setting up the SMTP session, or there was a
3407 non-message-specific error, such as a timeout.
3408 ERROR - a filter command is specified for this transport,
3409 and there was a problem setting it up; OR helo_data
3410 or add_headers or authenticated_sender is specified
3411 for this transport, and the string failed to expand
3413 For all non-OK returns the first addr of the list carries the
3414 time taken for the attempt.
3418 smtp_deliver(address_item *addrlist, host_item *host, int host_af, int defport,
3419 uschar *interface, transport_instance *tblock,
3420 BOOL *message_defer, BOOL suppress_tls)
3422 smtp_transport_options_block * ob = SOB tblock->options_block;
3427 BOOL pass_message = FALSE;
3428 uschar *message = NULL;
3429 uschar new_message_id[MESSAGE_ID_LENGTH + 1];
3430 smtp_context * sx = store_get(sizeof(*sx), TRUE); /* tainted, for the data buffers */
3432 suppress_tls = suppress_tls; /* stop compiler warning when no TLS support */
3433 *message_defer = FALSE;
3435 memset(sx, 0, sizeof(*sx));
3436 sx->addrlist = addrlist;
3437 sx->conn_args.host = host;
3438 sx->conn_args.host_af = host_af,
3440 sx->conn_args.interface = interface;
3441 sx->helo_data = NULL;
3442 sx->conn_args.tblock = tblock;
3443 /* sx->verify = FALSE; */
3444 gettimeofday(&sx->delivery_start, NULL);
3445 sx->sync_addr = sx->first_addr = addrlist;
3447 /* Get the channel set up ready for a message (MAIL FROM being the next
3448 SMTP command to send */
3450 if ((rc = smtp_setup_conn(sx, suppress_tls)) != OK)
3452 timesince(&addrlist->delivery_time, &sx->delivery_start);
3456 /* If there is a filter command specified for this transport, we can now
3457 set it up. This cannot be done until the identify of the host is known. */
3459 if (tblock->filter_command)
3461 transport_filter_timeout = tblock->filter_timeout;
3463 /* On failure, copy the error to all addresses, abandon the SMTP call, and
3466 if (!transport_set_up_command(&transport_filter_argv,
3467 tblock->filter_command, TRUE, DEFER, addrlist,
3468 string_sprintf("%.50s transport", tblock->name), NULL))
3470 set_errno_nohost(addrlist->next, addrlist->basic_errno, addrlist->message, DEFER,
3471 FALSE, &sx->delivery_start);
3476 if ( transport_filter_argv
3477 && *transport_filter_argv
3478 && **transport_filter_argv
3479 && sx->peer_offered & OPTION_CHUNKING
3480 #ifndef DISABLE_DKIM
3481 /* When dkim signing, chunking is handled even with a transport-filter */
3482 && !(ob->dkim.dkim_private_key && ob->dkim.dkim_domain && ob->dkim.dkim_selector)
3483 && !ob->dkim.force_bodyhash
3487 sx->peer_offered &= ~OPTION_CHUNKING;
3488 DEBUG(D_transport) debug_printf("CHUNKING not usable due to transport filter\n");
3492 /* For messages that have more than the maximum number of envelope recipients,
3493 we want to send several transactions down the same SMTP connection. (See
3494 comments in deliver.c as to how this reconciles, heuristically, with
3495 remote_max_parallel.) This optimization was added to Exim after the following
3496 code was already working. The simplest way to put it in without disturbing the
3497 code was to use a goto to jump back to this point when there is another
3498 transaction to handle. */
3501 sx->from_addr = return_path;
3502 sx->sync_addr = sx->first_addr;
3504 sx->send_rset = TRUE;
3505 sx->completed_addr = FALSE;
3508 /* If we are a continued-connection-after-verify the MAIL and RCPT
3509 commands were already sent; do not re-send but do mark the addrs as
3510 having been accepted up to RCPT stage. A traditional cont-conn
3511 always has a sequence number greater than one. */
3513 if (continue_hostname && continue_sequence == 1)
3515 /* sx->pending_MAIL = FALSE; */
3517 /* sx->next_addr = NULL; */
3519 for (address_item * addr = addrlist; addr; addr = addr->next)
3520 addr->transport_return = PENDING_OK;
3524 /* Initiate a message transfer. */
3526 switch(smtp_write_mail_and_rcpt_cmds(sx, &yield))
3529 case -1: case -2: goto RESPONSE_FAILED;
3530 case -3: goto END_OFF;
3531 case -4: goto SEND_QUIT;
3532 default: goto SEND_FAILED;
3535 /* If we are an MUA wrapper, abort if any RCPTs were rejected, either
3536 permanently or temporarily. We should have flushed and synced after the last
3544 for (a = sx->first_addr, cnt = 0; a && cnt < sx->max_rcpt; a = a->next, cnt++)
3545 if (a->transport_return != PENDING_OK)
3547 /*XXX could we find a better errno than 0 here? */
3548 set_errno_nohost(addrlist, 0, a->message, FAIL,
3549 testflag(a, af_pass_message), &sx->delivery_start);
3556 /* If ok is TRUE, we know we have got at least one good recipient, and must now
3557 send DATA, but if it is FALSE (in the normal, non-wrapper case), we may still
3558 have a good recipient buffered up if we are pipelining. We don't want to waste
3559 time sending DATA needlessly, so we only send it if either ok is TRUE or if we
3560 are pipelining. The responses are all handled by sync_responses().
3561 If using CHUNKING, do not send a BDAT until we know how big a chunk we want
3564 if ( !(sx->peer_offered & OPTION_CHUNKING)
3565 && (sx->ok || (pipelining_active && !mua_wrapper)))
3567 int count = smtp_write_command(sx, SCMD_FLUSH, "DATA\r\n");
3569 if (count < 0) goto SEND_FAILED;
3570 switch(sync_responses(sx, count, sx->ok ? +1 : -1))
3572 case 3: sx->ok = TRUE; /* 2xx & 5xx => OK & progress made */
3573 case 2: sx->completed_addr = TRUE; /* 5xx (only) => progress made */
3576 case 1: sx->ok = TRUE; /* 2xx (only) => OK, but if LMTP, */
3577 if (!sx->lmtp) sx->completed_addr = TRUE; /* can't tell about progress yet */
3578 case 0: break; /* No 2xx or 5xx, but no probs */
3580 case -1: goto END_OFF; /* Timeout on RCPT */
3582 #ifndef DISABLE_PIPE_CONNECT
3583 case -5: /* TLS first-read error */
3584 case -4: HDEBUG(D_transport)
3585 debug_printf("failed reaping pipelined cmd responses\n");
3587 default: goto RESPONSE_FAILED; /* I/O error, or any MAIL/DATA error */
3589 pipelining_active = FALSE;
3590 data_command = string_copy(big_buffer); /* Save for later error message */
3593 /* If there were no good recipients (but otherwise there have been no
3594 problems), just set ok TRUE, since we have handled address-specific errors
3595 already. Otherwise, it's OK to send the message. Use the check/escape mechanism
3596 for handling the SMTP dot-handling protocol, flagging to apply to headers as
3597 well as body. Set the appropriate timeout value to be used for each chunk.
3598 (Haven't been able to make it work using select() for writing yet.) */
3601 && (!(sx->peer_offered & OPTION_CHUNKING) || !pipelining_active))
3603 /* Save the first address of the next batch. */
3604 sx->first_addr = sx->next_addr;
3610 transport_ctx tctx = {
3611 .u = {.fd = sx->cctx.sock}, /*XXX will this need TLS info? */
3614 .check_string = US".",
3615 .escape_string = US"..", /* Escaping strings */
3617 topt_use_crlf | topt_escape_headers
3618 | (tblock->body_only ? topt_no_headers : 0)
3619 | (tblock->headers_only ? topt_no_body : 0)
3620 | (tblock->return_path_add ? topt_add_return_path : 0)
3621 | (tblock->delivery_date_add ? topt_add_delivery_date : 0)
3622 | (tblock->envelope_to_add ? topt_add_envelope_to : 0)
3625 /* If using CHUNKING we need a callback from the generic transport
3626 support to us, for the sending of BDAT smtp commands and the reaping
3627 of responses. The callback needs a whole bunch of state so set up
3628 a transport-context structure to be passed around. */
3630 if (sx->peer_offered & OPTION_CHUNKING)
3632 tctx.check_string = tctx.escape_string = NULL;
3633 tctx.options |= topt_use_bdat;
3634 tctx.chunk_cb = smtp_chunk_cmd_callback;
3635 sx->pending_BDAT = FALSE;
3636 sx->good_RCPT = sx->ok;
3638 tctx.smtp_context = sx;
3641 tctx.options |= topt_end_dot;
3643 /* Save the first address of the next batch. */
3644 sx->first_addr = sx->next_addr;
3646 /* Responses from CHUNKING commands go in buffer. Otherwise,
3647 there has not been a response. */
3651 sigalrm_seen = FALSE;
3652 transport_write_timeout = ob->data_timeout;
3653 smtp_command = US"sending data block"; /* For error messages */
3654 DEBUG(D_transport|D_v)
3655 if (sx->peer_offered & OPTION_CHUNKING)
3656 debug_printf(" will write message using CHUNKING\n");
3658 debug_printf(" SMTP>> writing message and terminating \".\"\n");
3659 transport_count = 0;
3661 #ifndef DISABLE_DKIM
3663 # ifdef MEASURE_TIMING
3665 gettimeofday(&t0, NULL);
3667 dkim_exim_sign_init();
3668 # ifdef EXPERIMENTAL_ARC
3670 uschar * s = ob->arc_sign;
3673 if (!(ob->dkim.arc_signspec = s = expand_string(s)))
3675 if (!f.expand_string_forcedfail)
3677 message = US"failed to expand arc_sign";
3684 /* Ask dkim code to hash the body for ARC */
3685 (void) arc_ams_setup_sign_bodyhash();
3686 ob->dkim.force_bodyhash = TRUE;
3691 # ifdef MEASURE_TIMING
3692 report_time_since(&t0, US"dkim_exim_sign_init (delta)");
3695 sx->ok = dkim_transport_write_message(&tctx, &ob->dkim, CUSS &message);
3697 sx->ok = transport_write_message(&tctx, 0);
3700 /* transport_write_message() uses write() because it is called from other
3701 places to write to non-sockets. This means that under some OS (e.g. Solaris)
3702 it can exit with "Broken pipe" as its error. This really means that the
3703 socket got closed at the far end. */
3705 transport_write_timeout = 0; /* for subsequent transports */
3707 /* Failure can either be some kind of I/O disaster (including timeout),
3708 or the failure of a transport filter or the expansion of added headers.
3709 Or, when CHUNKING, it can be a protocol-detected failure. */
3712 if (message) goto SEND_FAILED;
3713 else goto RESPONSE_FAILED;
3715 /* We used to send the terminating "." explicitly here, but because of
3716 buffering effects at both ends of TCP/IP connections, you don't gain
3717 anything by keeping it separate, so it might as well go in the final
3718 data buffer for efficiency. This is now done by setting the topt_end_dot
3721 smtp_command = US"end of data";
3723 if (sx->peer_offered & OPTION_CHUNKING && sx->cmd_count > 1)
3725 /* Reap any outstanding MAIL & RCPT commands, but not a DATA-go-ahead */
3726 switch(sync_responses(sx, sx->cmd_count-1, 0))
3728 case 3: sx->ok = TRUE; /* 2xx & 5xx => OK & progress made */
3729 case 2: sx->completed_addr = TRUE; /* 5xx (only) => progress made */
3732 case 1: sx->ok = TRUE; /* 2xx (only) => OK, but if LMTP, */
3733 if (!sx->lmtp) sx->completed_addr = TRUE; /* can't tell about progress yet */
3734 case 0: break; /* No 2xx or 5xx, but no probs */
3736 case -1: goto END_OFF; /* Timeout on RCPT */
3738 #ifndef DISABLE_PIPE_CONNECT
3739 case -5: /* TLS first-read error */
3740 case -4: HDEBUG(D_transport)
3741 debug_printf("failed reaping pipelined cmd responses\n");
3743 default: goto RESPONSE_FAILED; /* I/O error, or any MAIL/DATA error */
3747 #ifndef DISABLE_PRDR
3748 /* For PRDR we optionally get a partial-responses warning followed by the
3749 individual responses, before going on with the overall response. If we don't
3750 get the warning then deal with per non-PRDR. */
3754 sx->ok = smtp_read_response(sx, sx->buffer, sizeof(sx->buffer), '3', ob->final_timeout);
3755 if (!sx->ok && errno == 0) switch(sx->buffer[0])
3757 case '2': sx->prdr_active = FALSE;
3760 case '4': errno = ERRNO_DATA4XX;
3761 addrlist->more_errno |=
3762 ((sx->buffer[1] - '0')*10 + sx->buffer[2] - '0') << 8;
3769 /* For non-PRDR SMTP, we now read a single response that applies to the
3770 whole message. If it is OK, then all the addresses have been delivered. */
3774 sx->ok = smtp_read_response(sx, sx->buffer, sizeof(sx->buffer), '2',
3776 if (!sx->ok && errno == 0 && sx->buffer[0] == '4')
3778 errno = ERRNO_DATA4XX;
3779 addrlist->more_errno |= ((sx->buffer[1] - '0')*10 + sx->buffer[2] - '0') << 8;
3783 /* For LMTP, we get back a response for every RCPT command that we sent;
3784 some may be accepted and some rejected. For those that get a response, their
3785 status is fixed; any that are accepted have been handed over, even if later
3786 responses crash - at least, that's how I read RFC 2033.
3788 If all went well, mark the recipient addresses as completed, record which
3789 host/IPaddress they were delivered to, and cut out RSET when sending another
3790 message down the same channel. Write the completed addresses to the journal
3791 now so that they are recorded in case there is a crash of hardware or
3792 software before the spool gets updated. Also record the final SMTP
3793 confirmation if needed (for SMTP only). */
3798 struct timeval delivery_time;
3800 uschar * conf = NULL;
3802 timesince(&delivery_time, &sx->delivery_start);
3803 sx->send_rset = FALSE;
3804 pipelining_active = FALSE;
3806 /* Set up confirmation if needed - applies only to SMTP */
3809 #ifdef DISABLE_EVENT
3810 LOGGING(smtp_confirmation) &&
3815 const uschar *s = string_printing(sx->buffer);
3816 /* deconst cast ok here as string_printing was checked to have alloc'n'copied */
3817 conf = (s == sx->buffer)? US string_copy(s) : US s;
3820 /* Process all transported addresses - for LMTP or PRDR, read a status for
3823 for (address_item * addr = addrlist; addr != sx->first_addr; addr = addr->next)
3825 if (addr->transport_return != PENDING_OK) continue;
3827 /* LMTP - if the response fails badly (e.g. timeout), use it for all the
3828 remaining addresses. Otherwise, it's a return code for just the one
3829 address. For temporary errors, add a retry item for the address so that
3830 it doesn't get tried again too soon. */
3832 #ifndef DISABLE_PRDR
3833 if (sx->lmtp || sx->prdr_active)
3838 if (!smtp_read_response(sx, sx->buffer, sizeof(sx->buffer), '2',
3841 if (errno != 0 || sx->buffer[0] == 0) goto RESPONSE_FAILED;
3842 addr->message = string_sprintf(
3843 #ifndef DISABLE_PRDR
3844 "%s error after %s: %s", sx->prdr_active ? "PRDR":"LMTP",
3846 "LMTP error after %s: %s",
3848 data_command, string_printing(sx->buffer));
3849 setflag(addr, af_pass_message); /* Allow message to go to user */
3850 if (sx->buffer[0] == '5')
3851 addr->transport_return = FAIL;
3854 errno = ERRNO_DATA4XX;
3855 addr->more_errno |= ((sx->buffer[1] - '0')*10 + sx->buffer[2] - '0') << 8;
3856 addr->transport_return = DEFER;
3857 #ifndef DISABLE_PRDR
3858 if (!sx->prdr_active)
3860 retry_add_item(addr, addr->address_retry_key, 0);
3864 sx->completed_addr = TRUE; /* NOW we can set this flag */
3865 if (LOGGING(smtp_confirmation))
3867 const uschar *s = string_printing(sx->buffer);
3868 /* deconst cast ok here as string_printing was checked to have alloc'n'copied */
3869 conf = (s == sx->buffer) ? US string_copy(s) : US s;
3873 /* SMTP, or success return from LMTP for this address. Pass back the
3874 actual host that was used. */
3876 addr->transport_return = OK;
3877 addr->host_used = host;
3878 addr->delivery_time = delivery_time;
3879 addr->special_action = flag;
3880 addr->message = conf;
3882 if (tcp_out_fastopen)
3884 setflag(addr, af_tcp_fastopen_conn);
3885 if (tcp_out_fastopen >= TFO_USED_NODATA) setflag(addr, af_tcp_fastopen);
3886 if (tcp_out_fastopen >= TFO_USED_DATA) setflag(addr, af_tcp_fastopen_data);
3888 if (sx->pipelining_used) setflag(addr, af_pipelining);
3889 #ifndef DISABLE_PIPE_CONNECT
3890 if (sx->early_pipe_active) setflag(addr, af_early_pipe);
3892 #ifndef DISABLE_PRDR
3893 if (sx->prdr_active) setflag(addr, af_prdr_used);
3895 if (sx->peer_offered & OPTION_CHUNKING) setflag(addr, af_chunking_used);
3898 #ifndef DISABLE_PRDR
3899 if (!sx->prdr_active)
3902 /* Update the journal. For homonymic addresses, use the base address plus
3903 the transport name. See lots of comments in deliver.c about the reasons
3904 for the complications when homonyms are involved. Just carry on after
3905 write error, as it may prove possible to update the spool file later. */
3907 if (testflag(addr, af_homonym))
3908 sprintf(CS sx->buffer, "%.500s/%s\n", addr->unique + 3, tblock->name);
3910 sprintf(CS sx->buffer, "%.500s\n", addr->unique);
3912 DEBUG(D_deliver) debug_printf("S:journalling %s\n", sx->buffer);
3913 len = Ustrlen(CS sx->buffer);
3914 if (write(journal_fd, sx->buffer, len) != len)
3915 log_write(0, LOG_MAIN|LOG_PANIC, "failed to write journal for "
3916 "%s: %s", sx->buffer, strerror(errno));
3920 #ifndef DISABLE_PRDR
3921 if (sx->prdr_active)
3923 const uschar * overall_message;
3925 /* PRDR - get the final, overall response. For any non-success
3926 upgrade all the address statuses. */
3928 sx->ok = smtp_read_response(sx, sx->buffer, sizeof(sx->buffer), '2',
3932 if(errno == 0 && sx->buffer[0] == '4')
3934 errno = ERRNO_DATA4XX;
3935 addrlist->more_errno |= ((sx->buffer[1] - '0')*10 + sx->buffer[2] - '0') << 8;
3937 for (address_item * addr = addrlist; addr != sx->first_addr; addr = addr->next)
3938 if (sx->buffer[0] == '5' || addr->transport_return == OK)
3939 addr->transport_return = PENDING_OK; /* allow set_errno action */
3940 goto RESPONSE_FAILED;
3943 /* Append the overall response to the individual PRDR response for logging
3944 and update the journal, or setup retry. */
3946 overall_message = string_printing(sx->buffer);
3947 for (address_item * addr = addrlist; addr != sx->first_addr; addr = addr->next)
3948 if (addr->transport_return == OK)
3949 addr->message = string_sprintf("%s\\n%s", addr->message, overall_message);
3951 for (address_item * addr = addrlist; addr != sx->first_addr; addr = addr->next)
3952 if (addr->transport_return == OK)
3954 if (testflag(addr, af_homonym))
3955 sprintf(CS sx->buffer, "%.500s/%s\n", addr->unique + 3, tblock->name);
3957 sprintf(CS sx->buffer, "%.500s\n", addr->unique);
3959 DEBUG(D_deliver) debug_printf("journalling(PRDR) %s\n", sx->buffer);
3960 len = Ustrlen(CS sx->buffer);
3961 if (write(journal_fd, sx->buffer, len) != len)
3962 log_write(0, LOG_MAIN|LOG_PANIC, "failed to write journal for "
3963 "%s: %s", sx->buffer, strerror(errno));
3965 else if (addr->transport_return == DEFER)
3966 retry_add_item(addr, addr->address_retry_key, -2);
3970 /* Ensure the journal file is pushed out to disk. */
3972 if (EXIMfsync(journal_fd) < 0)
3973 log_write(0, LOG_MAIN|LOG_PANIC, "failed to fsync journal: %s",
3979 /* Handle general (not specific to one address) failures here. The value of ok
3980 is used to skip over this code on the falling through case. A timeout causes a
3981 deferral. Other errors may defer or fail according to the response code, and
3982 may set up a special errno value, e.g. after connection chopped, which is
3983 assumed if errno == 0 and there is no text in the buffer. If control reaches
3984 here during the setting up phase (i.e. before MAIL FROM) then always defer, as
3985 the problem is not related to this specific message. */
3990 uschar * set_message;
3996 sx->send_quit = check_response(host, &save_errno, addrlist->more_errno,
3997 sx->buffer, &code, &message, &pass_message);
4005 message = string_sprintf("send() to %s [%s] failed: %s",
4006 host->name, host->address, message ? message : US strerror(save_errno));
4007 sx->send_quit = FALSE;
4015 sx->ok = FALSE; /* For when reached by GOTO */
4016 set_message = message;
4018 /* We want to handle timeouts after MAIL or "." and loss of connection after
4019 "." specially. They can indicate a problem with the sender address or with
4020 the contents of the message rather than a real error on the connection. These
4021 cases are treated in the same way as a 4xx response. This next bit of code
4022 does the classification. */
4029 message_error = TRUE;
4033 message_error = Ustrncmp(smtp_command,"MAIL",4) == 0 ||
4034 Ustrncmp(smtp_command,"end ",4) == 0;
4037 case ERRNO_SMTPCLOSED:
4038 message_error = Ustrncmp(smtp_command,"end ",4) == 0;
4042 message_error = FALSE;
4046 /* Handle the cases that are treated as message errors. These are:
4048 (a) negative response or timeout after MAIL
4049 (b) negative response after DATA
4050 (c) negative response or timeout or dropped connection after "."
4051 (d) utf8 support required and not offered
4053 It won't be a negative response or timeout after RCPT, as that is dealt
4054 with separately above. The action in all cases is to set an appropriate
4055 error code for all the addresses, but to leave yield set to OK because the
4056 host itself has not failed. Of course, it might in practice have failed
4057 when we've had a timeout, but if so, we'll discover that at the next
4058 delivery attempt. For a temporary error, set the message_defer flag, and
4059 write to the logs for information if this is not the last host. The error
4060 for the last host will be logged as part of the address's log line. */
4064 if (mua_wrapper) code = '5'; /* Force hard failure in wrapper mode */
4066 /* If there's an errno, the message contains just the identity of
4071 else /* Anything other than 5 is treated as temporary */
4075 message = US string_sprintf("%s: %s", message, strerror(save_errno));
4077 write_logs(host, message, sx->first_addr ? sx->first_addr->basic_errno : 0);
4079 *message_defer = TRUE;
4083 /* Otherwise, we have an I/O error or a timeout other than after MAIL or
4084 ".", or some other transportation error. We defer all addresses and yield
4085 DEFER, except for the case of failed add_headers expansion, or a transport
4086 filter failure, when the yield should be ERROR, to stop it trying other
4091 #ifndef DISABLE_PIPE_CONNECT
4092 /* If we were early-pipelinng and the actual EHLO response did not match
4093 the cached value we assumed, we could have detected it and passed a
4094 custom errno through to here. It would be nice to RSET and retry right
4095 away, but to reliably do that we eould need an extra synch point before
4096 we committed to data and that would discard half the gained roundrips.
4097 Or we could summarily drop the TCP connection. but that is also ugly.
4098 Instead, we ignore the possibility (having freshened the cache) and rely
4099 on the server telling us with a nonmessage error if we have tried to
4100 do something it no longer supports. */
4103 yield = (save_errno == ERRNO_CHHEADER_FAIL ||
4104 save_errno == ERRNO_FILTER_FAIL) ? ERROR : DEFER;
4108 set_errno(addrlist, save_errno, set_message, set_rc, pass_message, host,
4109 #ifdef EXPERIMENTAL_DSN_INFO
4110 sx->smtp_greeting, sx->helo_response,
4112 &sx->delivery_start);
4115 /* If all has gone well, send_quit will be set TRUE, implying we can end the
4116 SMTP session tidily. However, if there were too many addresses to send in one
4117 message (indicated by first_addr being non-NULL) we want to carry on with the
4118 rest of them. Also, it is desirable to send more than one message down the SMTP
4119 connection if there are several waiting, provided we haven't already sent so
4120 many as to hit the configured limit. The function transport_check_waiting looks
4121 for a waiting message and returns its id. Then transport_pass_socket tries to
4122 set up a continued delivery by passing the socket on to another process. The
4123 variable send_rset is FALSE if a message has just been successfully transferred.
4125 If we are already sending down a continued channel, there may be further
4126 addresses not yet delivered that are aimed at the same host, but which have not
4127 been passed in this run of the transport. In this case, continue_more will be
4128 true, and all we should do is send RSET if necessary, and return, leaving the
4131 However, if no address was disposed of, i.e. all addresses got 4xx errors, we
4132 do not want to continue with other messages down the same channel, because that
4133 can lead to looping between two or more messages, all with the same,
4134 temporarily failing address(es). [The retry information isn't updated yet, so
4135 new processes keep on trying.] We probably also don't want to try more of this
4136 message's addresses either.
4138 If we have started a TLS session, we have to end it before passing the
4139 connection to a new process. However, not all servers can handle this (Exim
4140 can), so we do not pass such a connection on if the host matches
4141 hosts_nopass_tls. */
4144 debug_printf("ok=%d send_quit=%d send_rset=%d continue_more=%d "
4145 "yield=%d first_address is %sNULL\n", sx->ok, sx->send_quit,
4146 sx->send_rset, f.continue_more, yield, sx->first_addr ? "not " : "");
4148 if (sx->completed_addr && sx->ok && sx->send_quit)
4151 smtp_compare_t t_compare;
4153 t_compare.tblock = tblock;
4154 t_compare.current_sender_address = sender_address;
4156 if ( sx->first_addr != NULL
4160 ( tls_out.active.sock < 0 && !continue_proxy_cipher
4161 || verify_check_given_host(CUSS &ob->hosts_nopass_tls, host) != OK
4165 transport_check_waiting(tblock->name, host->name,
4166 tblock->connection_max_messages, new_message_id, &more,
4167 (oicf)smtp_are_same_identities, (void*)&t_compare)
4174 if (! (sx->ok = smtp_write_command(sx, SCMD_FLUSH, "RSET\r\n") >= 0))
4176 msg = US string_sprintf("send() to %s [%s] failed: %s", host->name,
4177 host->address, strerror(errno));
4178 sx->send_quit = FALSE;
4180 else if (! (sx->ok = smtp_read_response(sx, sx->buffer, sizeof(sx->buffer),
4181 '2', ob->command_timeout)))
4184 sx->send_quit = check_response(host, &errno, 0, sx->buffer, &code, &msg,
4188 DEBUG(D_transport) debug_printf("H=%s [%s] %s\n",
4189 host->name, host->address, msg);
4193 /* Either RSET was not needed, or it succeeded */
4200 int socket_fd = sx->cctx.sock;
4203 if (sx->first_addr != NULL) /* More addresses still to be sent */
4204 { /* in this run of the transport */
4205 continue_sequence++; /* Causes * in logging */
4206 pipelining_active = sx->pipelining_used; /* was cleared at DATA */
4210 /* Unless caller said it already has more messages listed for this host,
4211 pass the connection on to a new Exim process (below, the call to
4212 transport_pass_socket). If the caller has more ready, just return with
4213 the connection still open. */
4216 if (tls_out.active.sock >= 0)
4217 if ( f.continue_more
4218 || verify_check_given_host(CUSS &ob->hosts_noproxy_tls, host) == OK)
4220 /* Before passing the socket on, or returning to caller with it still
4221 open, we must shut down TLS. Not all MTAs allow for the continuation
4222 of the SMTP session when TLS is shut down. We test for this by sending
4223 a new EHLO. If we don't get a good response, we don't attempt to pass
4226 tls_close(sx->cctx.tls_ctx, TLS_SHUTDOWN_WAIT);
4227 sx->cctx.tls_ctx = NULL;
4228 smtp_peer_options = smtp_peer_options_wrap;
4230 && smtp_write_command(sx, SCMD_FLUSH, "EHLO %s\r\n", sx->helo_data)
4232 && smtp_read_response(sx, sx->buffer, sizeof(sx->buffer),
4233 '2', ob->command_timeout);
4235 if (sx->ok && f.continue_more)
4236 return yield; /* More addresses for another run */
4240 /* Set up a pipe for proxying TLS for the new transport process */
4242 smtp_peer_options |= OPTION_TLS;
4243 if ((sx->ok = socketpair(AF_UNIX, SOCK_STREAM, 0, pfd) == 0))
4246 set_errno(sx->first_addr, errno, US"internal allocation problem",
4248 # ifdef EXPERIMENTAL_DSN_INFO
4249 sx->smtp_greeting, sx->helo_response,
4251 &sx->delivery_start);
4255 if (f.continue_more)
4256 return yield; /* More addresses for another run */
4258 /* If the socket is successfully passed, we mustn't send QUIT (or
4259 indeed anything!) from here. */
4261 /*XXX DSN_INFO: assume likely to do new HELO; but for greet we'll want to
4262 propagate it from the initial
4264 if (sx->ok && transport_pass_socket(tblock->name, host->name,
4265 host->address, new_message_id, socket_fd))
4267 sx->send_quit = FALSE;
4269 /* We have passed the client socket to a fresh transport process.
4270 If TLS is still active, we need to proxy it for the transport we
4271 just passed the baton to. Fork a child to to do it, and return to
4272 get logging done asap. Which way to place the work makes assumptions
4273 about post-fork prioritisation which may not hold on all platforms. */
4275 if (tls_out.active.sock >= 0)
4278 if (pid == 0) /* child; fork again to disconnect totally */
4280 testharness_pause_ms(100); /* let parent debug out */
4281 /* does not return */
4282 smtp_proxy_tls(sx->cctx.tls_ctx, sx->buffer, sizeof(sx->buffer), pfd,
4283 ob->command_timeout);
4286 if (pid > 0) /* parent */
4288 DEBUG(D_transport) debug_printf("proxy-proc inter-pid %d\n", pid);
4290 /* tidy the inter-proc to disconn the proxy proc */
4291 waitpid(pid, NULL, 0);
4292 tls_close(sx->cctx.tls_ctx, TLS_NO_SHUTDOWN);
4293 sx->cctx.tls_ctx = NULL;
4294 (void)close(sx->cctx.sock);
4296 continue_transport = NULL;
4297 continue_hostname = NULL;
4300 log_write(0, LOG_PANIC_DIE, "fork failed");
4306 /* If RSET failed and there are addresses left, they get deferred. */
4308 set_errno(sx->first_addr, errno, msg, DEFER, FALSE, host,
4309 #ifdef EXPERIMENTAL_DSN_INFO
4310 sx->smtp_greeting, sx->helo_response,
4312 &sx->delivery_start);
4316 /* End off tidily with QUIT unless the connection has died or the socket has
4317 been passed to another process. There has been discussion on the net about what
4318 to do after sending QUIT. The wording of the RFC suggests that it is necessary
4319 to wait for a response, but on the other hand, there isn't anything one can do
4320 with an error response, other than log it. Exim used to do that. However,
4321 further discussion suggested that it is positively advantageous not to wait for
4322 the response, but to close the session immediately. This is supposed to move
4323 the TCP/IP TIME_WAIT state from the server to the client, thereby removing some
4324 load from the server. (Hosts that are both servers and clients may not see much
4325 difference, of course.) Further discussion indicated that this was safe to do
4326 on Unix systems which have decent implementations of TCP/IP that leave the
4327 connection around for a while (TIME_WAIT) after the application has gone away.
4328 This enables the response sent by the server to be properly ACKed rather than
4329 timed out, as can happen on broken TCP/IP implementations on other OS.
4331 This change is being made on 31-Jul-98. After over a year of trouble-free
4332 operation, the old commented-out code was removed on 17-Sep-99. */
4336 (void) setsockopt(sx->cctx.sock, IPPROTO_TCP, TCP_CORK, US &on, sizeof(on));
4338 if (sx->send_quit) (void)smtp_write_command(sx, SCMD_FLUSH, "QUIT\r\n");
4343 tls_close(sx->cctx.tls_ctx, TLS_SHUTDOWN_NOWAIT);
4344 sx->cctx.tls_ctx = NULL;
4347 /* Close the socket, and return the appropriate value, first setting
4348 works because the NULL setting is passed back to the calling process, and
4349 remote_max_parallel is forced to 1 when delivering over an existing connection,
4351 If all went well and continue_more is set, we shouldn't actually get here if
4352 there are further addresses, as the return above will be taken. However,
4353 writing RSET might have failed, or there may be other addresses whose hosts are
4354 specified in the transports, and therefore not visible at top level, in which
4355 case continue_more won't get set. */
4357 HDEBUG(D_transport|D_acl|D_v) debug_printf_indent(" SMTP(close)>>\n");
4360 shutdown(sx->cctx.sock, SHUT_WR);
4362 testharness_pause_ms(200);
4363 if (fcntl(sx->cctx.sock, F_SETFL, O_NONBLOCK) == 0)
4364 for (int i = 16; read(sx->cctx.sock, sx->inbuffer, sizeof(sx->inbuffer)) > 0 && i > 0;)
4365 i--; /* drain socket */
4367 (void)close(sx->cctx.sock);
4369 #ifndef DISABLE_EVENT
4370 (void) event_raise(tblock->event_action, US"tcp:close", NULL);
4373 continue_transport = NULL;
4374 continue_hostname = NULL;
4381 /*************************************************
4382 * Closedown entry point *
4383 *************************************************/
4385 /* This function is called when exim is passed an open smtp channel
4386 from another incarnation, but the message which it has been asked
4387 to deliver no longer exists. The channel is on stdin.
4389 We might do fancy things like looking for another message to send down
4390 the channel, but if the one we sought has gone, it has probably been
4391 delivered by some other process that itself will seek further messages,
4392 so just close down our connection.
4394 Argument: pointer to the transport instance block
4399 smtp_transport_closedown(transport_instance *tblock)
4401 smtp_transport_options_block * ob = SOB tblock->options_block;
4402 client_conn_ctx cctx;
4405 uschar inbuffer[4096];
4406 uschar outbuffer[16];
4408 /*XXX really we need an active-smtp-client ctx, rather than assuming stdout */
4409 cctx.sock = fileno(stdin);
4410 cctx.tls_ctx = cctx.sock == tls_out.active.sock ? tls_out.active.tls_ctx : NULL;
4412 sx.inblock.cctx = &cctx;
4413 sx.inblock.buffer = inbuffer;
4414 sx.inblock.buffersize = sizeof(inbuffer);
4415 sx.inblock.ptr = inbuffer;
4416 sx.inblock.ptrend = inbuffer;
4418 sx.outblock.cctx = &cctx;
4419 sx.outblock.buffersize = sizeof(outbuffer);
4420 sx.outblock.buffer = outbuffer;
4421 sx.outblock.ptr = outbuffer;
4422 sx.outblock.cmd_count = 0;
4423 sx.outblock.authenticating = FALSE;
4425 (void)smtp_write_command(&sx, SCMD_FLUSH, "QUIT\r\n");
4426 (void)smtp_read_response(&sx, buffer, sizeof(buffer), '2', ob->command_timeout);
4427 (void)close(cctx.sock);
4432 /*************************************************
4433 * Prepare addresses for delivery *
4434 *************************************************/
4436 /* This function is called to flush out error settings from previous delivery
4437 attempts to other hosts. It also records whether we got here via an MX record
4438 or not in the more_errno field of the address. We are interested only in
4439 addresses that are still marked DEFER - others may have got delivered to a
4440 previously considered IP address. Set their status to PENDING_DEFER to indicate
4441 which ones are relevant this time.
4444 addrlist the list of addresses
4445 host the host we are delivering to
4447 Returns: the first address for this delivery
4450 static address_item *
4451 prepare_addresses(address_item *addrlist, host_item *host)
4453 address_item *first_addr = NULL;
4454 for (address_item * addr = addrlist; addr; addr = addr->next)
4455 if (addr->transport_return == DEFER)
4457 if (!first_addr) first_addr = addr;
4458 addr->transport_return = PENDING_DEFER;
4459 addr->basic_errno = 0;
4460 addr->more_errno = (host->mx >= 0)? 'M' : 'A';
4461 addr->message = NULL;
4463 addr->cipher = NULL;
4464 addr->ourcert = NULL;
4465 addr->peercert = NULL;
4466 addr->peerdn = NULL;
4467 addr->ocsp = OCSP_NOT_REQ;
4468 addr->tlsver = NULL;
4470 #ifdef EXPERIMENTAL_DSN_INFO
4471 addr->smtp_greeting = NULL;
4472 addr->helo_response = NULL;
4480 /*************************************************
4481 * Main entry point *
4482 *************************************************/
4484 /* See local README for interface details. As this is a remote transport, it is
4485 given a chain of addresses to be delivered in one connection, if possible. It
4486 always returns TRUE, indicating that each address has its own independent
4487 status set, except if there is a setting up problem, in which case it returns
4491 smtp_transport_entry(
4492 transport_instance *tblock, /* data for this instantiation */
4493 address_item *addrlist) /* addresses we are working on */
4496 int hosts_defer = 0;
4498 int hosts_looked_up = 0;
4499 int hosts_retry = 0;
4500 int hosts_serial = 0;
4501 int hosts_total = 0;
4502 int total_hosts_tried = 0;
4503 BOOL expired = TRUE;
4504 uschar *expanded_hosts = NULL;
4506 uschar *tid = string_sprintf("%s transport", tblock->name);
4507 smtp_transport_options_block *ob = SOB tblock->options_block;
4508 host_item *hostlist = addrlist->host_list;
4509 host_item *host = NULL;
4513 debug_printf("%s transport entered\n", tblock->name);
4514 for (address_item * addr = addrlist; addr; addr = addr->next)
4515 debug_printf(" %s\n", addr->address);
4518 debug_printf("hostlist:\n");
4519 for (host_item * host = hostlist; host; host = host->next)
4520 debug_printf(" '%s' IP %s port %d\n", host->name, host->address, host->port);
4522 if (continue_hostname)
4523 debug_printf("already connected to %s [%s] (on fd %d)\n",
4524 continue_hostname, continue_host_address,
4525 cutthrough.cctx.sock >= 0 ? cutthrough.cctx.sock : 0);
4528 /* Set the flag requesting that these hosts be added to the waiting
4529 database if the delivery fails temporarily or if we are running with
4530 queue_smtp or a 2-stage queue run. This gets unset for certain
4531 kinds of error, typically those that are specific to the message. */
4533 update_waiting = TRUE;
4535 /* If a host list is not defined for the addresses - they must all have the
4536 same one in order to be passed to a single transport - or if the transport has
4537 a host list with hosts_override set, use the host list supplied with the
4538 transport. It is an error for this not to exist. */
4540 if (!hostlist || (ob->hosts_override && ob->hosts))
4544 addrlist->message = string_sprintf("%s transport called with no hosts set",
4546 addrlist->transport_return = PANIC;
4547 return FALSE; /* Only top address has status */
4550 DEBUG(D_transport) debug_printf("using the transport's hosts: %s\n",
4553 /* If the transport's host list contains no '$' characters, and we are not
4554 randomizing, it is fixed and therefore a chain of hosts can be built once
4555 and for all, and remembered for subsequent use by other calls to this
4556 transport. If, on the other hand, the host list does contain '$', or we are
4557 randomizing its order, we have to rebuild it each time. In the fixed case,
4558 as the hosts string will never be used again, it doesn't matter that we
4559 replace all the : characters with zeros. */
4563 uschar *s = ob->hosts;
4565 if (Ustrchr(s, '$') != NULL)
4567 if (!(expanded_hosts = expand_string(s)))
4569 addrlist->message = string_sprintf("failed to expand list of hosts "
4570 "\"%s\" in %s transport: %s", s, tblock->name, expand_string_message);
4571 addrlist->transport_return = f.search_find_defer ? DEFER : PANIC;
4572 return FALSE; /* Only top address has status */
4574 DEBUG(D_transport) debug_printf("expanded list of hosts \"%s\" to "
4575 "\"%s\"\n", s, expanded_hosts);
4579 if (ob->hosts_randomize) s = expanded_hosts = string_copy(s);
4583 log_write(0, LOG_MAIN|LOG_PANIC,
4584 "attempt to use tainted host list '%s' from '%s' in transport %s",
4585 s, ob->hosts, tblock->name);
4586 /* Avoid leaking info to an attacker */
4587 addrlist->message = US"internal configuration error";
4588 addrlist->transport_return = PANIC;
4592 host_build_hostlist(&hostlist, s, ob->hosts_randomize);
4594 /* Check that the expansion yielded something useful. */
4598 string_sprintf("%s transport has empty hosts setting", tblock->name);
4599 addrlist->transport_return = PANIC;
4600 return FALSE; /* Only top address has status */
4603 /* If there was no expansion of hosts, save the host list for
4606 if (!expanded_hosts) ob->hostlist = hostlist;
4609 /* This is not the first time this transport has been run in this delivery;
4610 the host list was built previously. */
4613 hostlist = ob->hostlist;
4616 /* The host list was supplied with the address. If hosts_randomize is set, we
4617 must sort it into a random order if it did not come from MX records and has not
4618 already been randomized (but don't bother if continuing down an existing
4621 else if (ob->hosts_randomize && hostlist->mx == MX_NONE && !continue_hostname)
4623 host_item *newlist = NULL;
4626 host_item *h = hostlist;
4627 hostlist = hostlist->next;
4629 h->sort_key = random_number(100);
4636 else if (h->sort_key < newlist->sort_key)
4643 host_item *hh = newlist;
4646 if (h->sort_key < hh->next->sort_key) break;
4654 hostlist = addrlist->host_list = newlist;
4657 /* Sort out the default port. */
4659 if (!smtp_get_port(ob->port, addrlist, &defport, tid)) return FALSE;
4661 /* For each host-plus-IP-address on the list:
4663 . If this is a continued delivery and the host isn't the one with the
4664 current connection, skip.
4666 . If the status is unusable (i.e. previously failed or retry checked), skip.
4668 . If no IP address set, get the address, either by turning the name into
4669 an address, calling gethostbyname if gethostbyname is on, or by calling
4670 the DNS. The DNS may yield multiple addresses, in which case insert the
4671 extra ones into the list.
4673 . Get the retry data if not previously obtained for this address and set the
4674 field which remembers the state of this address. Skip if the retry time is
4675 not reached. If not, remember whether retry data was found. The retry string
4676 contains both the name and the IP address.
4678 . Scan the list of addresses and mark those whose status is DEFER as
4679 PENDING_DEFER. These are the only ones that will be processed in this cycle
4682 . Make a delivery attempt - addresses marked PENDING_DEFER will be tried.
4683 Some addresses may be successfully delivered, others may fail, and yet
4684 others may get temporary errors and so get marked DEFER.
4686 . The return from the delivery attempt is OK if a connection was made and a
4687 valid SMTP dialogue was completed. Otherwise it is DEFER.
4689 . If OK, add a "remove" retry item for this host/IPaddress, if any.
4691 . If fail to connect, or other defer state, add a retry item.
4693 . If there are any addresses whose status is still DEFER, carry on to the
4694 next host/IPaddress, unless we have tried the number of hosts given
4695 by hosts_max_try or hosts_max_try_hardlimit; otherwise return. Note that
4696 there is some fancy logic for hosts_max_try that means its limit can be
4697 overstepped in some circumstances.
4699 If we get to the end of the list, all hosts have deferred at least one address,
4700 or not reached their retry times. If delay_after_cutoff is unset, it requests a
4701 delivery attempt to those hosts whose last try was before the arrival time of
4702 the current message. To cope with this, we have to go round the loop a second
4703 time. After that, set the status and error data for any addresses that haven't
4704 had it set already. */
4706 for (int cutoff_retry = 0;
4707 expired && cutoff_retry < (ob->delay_after_cutoff ? 1 : 2);
4710 host_item *nexthost = NULL;
4711 int unexpired_hosts_tried = 0;
4712 BOOL continue_host_tried = FALSE;
4714 retry_non_continued:
4715 for (host = hostlist;
4717 && unexpired_hosts_tried < ob->hosts_max_try
4718 && total_hosts_tried < ob->hosts_max_try_hardlimit;
4723 BOOL host_is_expired = FALSE;
4724 BOOL message_defer = FALSE;
4725 BOOL some_deferred = FALSE;
4726 address_item *first_addr = NULL;
4727 uschar *interface = NULL;
4728 uschar *retry_host_key = NULL;
4729 uschar *retry_message_key = NULL;
4730 uschar *serialize_key = NULL;
4732 /* Default next host is next host. :-) But this can vary if the
4733 hosts_max_try limit is hit (see below). It may also be reset if a host
4734 address is looked up here (in case the host was multihomed). */
4736 nexthost = host->next;
4738 /* If the address hasn't yet been obtained from the host name, look it up
4739 now, unless the host is already marked as unusable. If it is marked as
4740 unusable, it means that the router was unable to find its IP address (in
4741 the DNS or wherever) OR we are in the 2nd time round the cutoff loop, and
4742 the lookup failed last time. We don't get this far if *all* MX records
4743 point to non-existent hosts; that is treated as a hard error.
4745 We can just skip this host entirely. When the hosts came from the router,
4746 the address will timeout based on the other host(s); when the address is
4747 looked up below, there is an explicit retry record added.
4749 Note that we mustn't skip unusable hosts if the address is not unset; they
4750 may be needed as expired hosts on the 2nd time round the cutoff loop. */
4754 int new_port, flags;
4756 if (host->status >= hstatus_unusable)
4758 DEBUG(D_transport) debug_printf("%s has no address and is unusable - skipping\n",
4763 DEBUG(D_transport) debug_printf("getting address for %s\n", host->name);
4765 /* The host name is permitted to have an attached port. Find it, and
4766 strip it from the name. Just remember it for now. */
4768 new_port = host_item_get_port(host);
4770 /* Count hosts looked up */
4774 /* Find by name if so configured, or if it's an IP address. We don't
4775 just copy the IP address, because we need the test-for-local to happen. */
4777 flags = HOST_FIND_BY_A | HOST_FIND_BY_AAAA;
4778 if (ob->dns_qualify_single) flags |= HOST_FIND_QUALIFY_SINGLE;
4779 if (ob->dns_search_parents) flags |= HOST_FIND_SEARCH_PARENTS;
4781 if (ob->gethostbyname || string_is_ip_address(host->name, NULL) != 0)
4782 rc = host_find_byname(host, NULL, flags, NULL, TRUE);
4784 rc = host_find_bydns(host, NULL, flags, NULL, NULL, NULL,
4785 &ob->dnssec, /* domains for request/require */
4788 /* Update the host (and any additional blocks, resulting from
4789 multihoming) with a host-specific port, if any. */
4791 for (host_item * hh = host; hh != nexthost; hh = hh->next) hh->port = new_port;
4793 /* Failure to find the host at this time (usually DNS temporary failure)
4794 is really a kind of routing failure rather than a transport failure.
4795 Therefore we add a retry item of the routing kind, not to stop us trying
4796 to look this name up here again, but to ensure the address gets timed
4797 out if the failures go on long enough. A complete failure at this point
4798 commonly points to a configuration error, but the best action is still
4799 to carry on for the next host. */
4801 if (rc == HOST_FIND_AGAIN || rc == HOST_FIND_SECURITY || rc == HOST_FIND_FAILED)
4803 retry_add_item(addrlist, string_sprintf("R:%s", host->name), 0);
4805 if (rc == HOST_FIND_AGAIN) hosts_defer++; else hosts_fail++;
4806 DEBUG(D_transport) debug_printf("rc = %s for %s\n", (rc == HOST_FIND_AGAIN)?
4807 "HOST_FIND_AGAIN" : "HOST_FIND_FAILED", host->name);
4808 host->status = hstatus_unusable;
4810 for (address_item * addr = addrlist; addr; addr = addr->next)
4812 if (addr->transport_return != DEFER) continue;
4813 addr->basic_errno = ERRNO_UNKNOWNHOST;
4814 addr->message = string_sprintf(
4815 rc == HOST_FIND_SECURITY
4816 ? "lookup of IP address for %s was insecure"
4817 : "failed to lookup IP address for %s",
4823 /* If the host is actually the local host, we may have a problem, or
4824 there may be some cunning configuration going on. In the problem case,
4825 log things and give up. The default transport status is already DEFER. */
4827 if (rc == HOST_FOUND_LOCAL && !ob->allow_localhost)
4829 for (address_item * addr = addrlist; addr; addr = addr->next)
4831 addr->basic_errno = ERRNO_HOST_IS_LOCAL;
4832 addr->message = string_sprintf("%s transport found host %s to be "
4833 "local", tblock->name, host->name);
4837 } /* End of block for IP address lookup */
4839 /* If this is a continued delivery, we are interested only in the host
4840 which matches the name of the existing open channel. The check is put
4841 here after the local host lookup, in case the name gets expanded as a
4842 result of the lookup. Set expired FALSE, to save the outer loop executing
4845 if (continue_hostname)
4846 if ( Ustrcmp(continue_hostname, host->name) != 0
4847 || Ustrcmp(continue_host_address, host->address) != 0
4851 continue; /* With next host */
4854 continue_host_tried = TRUE;
4856 /* Reset the default next host in case a multihomed host whose addresses
4857 are not looked up till just above added to the host list. */
4859 nexthost = host->next;
4861 /* If queue_smtp is set (-odqs or the first part of a 2-stage run), or the
4862 domain is in queue_smtp_domains, we don't actually want to attempt any
4863 deliveries. When doing a queue run, queue_smtp_domains is always unset. If
4864 there is a lookup defer in queue_smtp_domains, proceed as if the domain
4865 were not in it. We don't want to hold up all SMTP deliveries! Except when
4866 doing a two-stage queue run, don't do this if forcing. */
4868 if ( (!f.deliver_force || f.queue_2stage)
4870 || match_isinlist(addrlist->domain,
4871 CUSS &queue_smtp_domains, 0,
4872 &domainlist_anchor, NULL, MCL_DOMAIN, TRUE, NULL) == OK)
4875 DEBUG(D_transport) debug_printf("first-pass routing only\n");
4877 for (address_item * addr = addrlist; addr; addr = addr->next)
4878 if (addr->transport_return == DEFER)
4879 addr->message = US"first-pass only routing due to -odqs, "
4880 "queue_smtp_domains or control=queue";
4881 continue; /* With next host */
4884 /* Count hosts being considered - purely for an intelligent comment
4885 if none are usable. */
4889 /* Set $host and $host address now in case they are needed for the
4890 interface expansion or the serialize_hosts check; they remain set if an
4891 actual delivery happens. */
4893 deliver_host = host->name;
4894 deliver_host_address = host->address;
4895 lookup_dnssec_authenticated = host->dnssec == DS_YES ? US"yes"
4896 : host->dnssec == DS_NO ? US"no"
4899 /* Set up a string for adding to the retry key if the port number is not
4900 the standard SMTP port. A host may have its own port setting that overrides
4903 pistring = string_sprintf(":%d", host->port == PORT_NONE
4904 ? defport : host->port);
4905 if (Ustrcmp(pistring, ":25") == 0) pistring = US"";
4907 /* Select IPv4 or IPv6, and choose an outgoing interface. If the interface
4908 string is set, even if constant (as different transports can have different
4909 constant settings), we must add it to the key that is used for retries,
4910 because connections to the same host from a different interface should be
4911 treated separately. */
4913 host_af = Ustrchr(host->address, ':') == NULL ? AF_INET : AF_INET6;
4915 uschar * s = ob->interface;
4918 if (!smtp_get_interface(s, host_af, addrlist, &interface, tid))
4920 pistring = string_sprintf("%s/%s", pistring, interface);
4924 /* The first time round the outer loop, check the status of the host by
4925 inspecting the retry data. The second time round, we are interested only
4926 in expired hosts that haven't been tried since this message arrived. */
4928 if (cutoff_retry == 0)
4931 /* Ensure the status of the address is set by checking retry data if
4932 necessary. There may be host-specific retry data (applicable to all
4933 messages) and also data for retries of a specific message at this host.
4934 If either of these retry records are actually read, the keys used are
4935 returned to save recomputing them later. */
4937 if (exp_bool(addrlist, US"transport", tblock->name, D_transport,
4938 US"retry_include_ip_address", ob->retry_include_ip_address,
4939 ob->expand_retry_include_ip_address, &incl_ip) != OK)
4940 continue; /* with next host */
4942 host_is_expired = retry_check_address(addrlist->domain, host, pistring,
4943 incl_ip, &retry_host_key, &retry_message_key);
4945 DEBUG(D_transport) debug_printf("%s [%s]%s retry-status = %s\n", host->name,
4946 host->address ? host->address : US"", pistring,
4947 host->status == hstatus_usable ? "usable"
4948 : host->status == hstatus_unusable ? "unusable"
4949 : host->status == hstatus_unusable_expired ? "unusable (expired)" : "?");
4951 /* Skip this address if not usable at this time, noting if it wasn't
4952 actually expired, both locally and in the address. */
4954 switch (host->status)
4956 case hstatus_unusable:
4958 setflag(addrlist, af_retry_skipped);
4961 case hstatus_unusable_expired:
4964 case hwhy_retry: hosts_retry++; break;
4965 case hwhy_failed: hosts_fail++; break;
4967 case hwhy_deferred: hosts_defer++; break;
4970 /* If there was a retry message key, implying that previously there
4971 was a message-specific defer, we don't want to update the list of
4972 messages waiting for these hosts. */
4974 if (retry_message_key) update_waiting = FALSE;
4975 continue; /* With the next host or IP address */
4979 /* Second time round the loop: if the address is set but expired, and
4980 the message is newer than the last try, let it through. */
4985 || host->status != hstatus_unusable_expired
4986 || host->last_try > received_time.tv_sec)
4988 DEBUG(D_transport) debug_printf("trying expired host %s [%s]%s\n",
4989 host->name, host->address, pistring);
4990 host_is_expired = TRUE;
4993 /* Setting "expired=FALSE" doesn't actually mean not all hosts are expired;
4994 it remains TRUE only if all hosts are expired and none are actually tried.
4999 /* If this host is listed as one to which access must be serialized,
5000 see if another Exim process has a connection to it, and if so, skip
5001 this host. If not, update the database to record our connection to it
5002 and remember this for later deletion. Do not do any of this if we are
5003 sending the message down a pre-existing connection. */
5005 if ( !continue_hostname
5006 && verify_check_given_host(CUSS &ob->serialize_hosts, host) == OK)
5008 serialize_key = string_sprintf("host-serialize-%s", host->name);
5009 if (!enq_start(serialize_key, 1))
5012 debug_printf("skipping host %s because another Exim process "
5013 "is connected to it\n", host->name);
5019 /* OK, we have an IP address that is not waiting for its retry time to
5020 arrive (it might be expired) OR (second time round the loop) we have an
5021 expired host that hasn't been tried since the message arrived. Have a go
5022 at delivering the message to it. First prepare the addresses by flushing
5023 out the result of previous attempts, and finding the first address that
5024 is still to be delivered. */
5026 first_addr = prepare_addresses(addrlist, host);
5028 DEBUG(D_transport) debug_printf("delivering %s to %s [%s] (%s%s)\n",
5029 message_id, host->name, host->address, addrlist->address,
5030 addrlist->next ? ", ..." : "");
5032 set_process_info("delivering %s to %s [%s]%s (%s%s)",
5033 message_id, host->name, host->address, pistring, addrlist->address,
5034 addrlist->next ? ", ..." : "");
5036 /* This is not for real; don't do the delivery. If there are
5037 any remaining hosts, list them. */
5042 gettimeofday(&now, NULL);
5043 set_errno_nohost(addrlist, 0, NULL, OK, FALSE, &now);
5044 for (address_item * addr = addrlist; addr; addr = addr->next)
5046 addr->host_used = host;
5047 addr->special_action = '*';
5048 addr->message = US"delivery bypassed by -N option";
5052 debug_printf("*** delivery by %s transport bypassed by -N option\n"
5053 "*** host and remaining hosts:\n", tblock->name);
5054 for (host_item * host2 = host; host2; host2 = host2->next)
5055 debug_printf(" %s [%s]\n", host2->name,
5056 host2->address ? host2->address : US"unset");
5061 /* This is for real. If the host is expired, we don't count it for
5062 hosts_max_retry. This ensures that all hosts must expire before an address
5063 is timed out, unless hosts_max_try_hardlimit (which protects against
5064 lunatic DNS configurations) is reached.
5066 If the host is not expired and we are about to hit the hosts_max_retry
5067 limit, check to see if there is a subsequent hosts with a different MX
5068 value. If so, make that the next host, and don't count this one. This is a
5069 heuristic to make sure that different MXs do get tried. With a normal kind
5070 of retry rule, they would get tried anyway when the earlier hosts were
5071 delayed, but if the domain has a "retry every time" type of rule - as is
5072 often used for the the very large ISPs, that won't happen. */
5077 /* Make a copy of the host if it is local to this invocation
5078 of the transport. */
5082 thost = store_get(sizeof(host_item), FALSE);
5084 thost->name = string_copy(host->name);
5085 thost->address = string_copy(host->address);
5090 if (!host_is_expired && ++unexpired_hosts_tried >= ob->hosts_max_try)
5093 debug_printf("hosts_max_try limit reached with this host\n");
5094 for (host_item * h = host; h; h = h->next) if (h->mx != host->mx)
5097 unexpired_hosts_tried--;
5098 DEBUG(D_transport) debug_printf("however, a higher MX host exists "
5099 "and will be tried\n");
5104 /* Attempt the delivery. */
5106 total_hosts_tried++;
5107 rc = smtp_deliver(addrlist, thost, host_af, defport, interface, tblock,
5108 &message_defer, FALSE);
5111 OK => connection made, each address contains its result;
5112 message_defer is set for message-specific defers (when all
5113 recipients are marked defer)
5114 DEFER => there was a non-message-specific delivery problem;
5115 ERROR => there was a problem setting up the arguments for a filter,
5116 or there was a problem with expanding added headers
5119 /* If the result is not OK, there was a non-message-specific problem.
5120 If the result is DEFER, we need to write to the logs saying what happened
5121 for this particular host, except in the case of authentication and TLS
5122 failures, where the log has already been written. If all hosts defer a
5123 general message is written at the end. */
5125 if (rc == DEFER && first_addr->basic_errno != ERRNO_AUTHFAIL
5126 && first_addr->basic_errno != ERRNO_TLSFAILURE)
5127 write_logs(host, first_addr->message, first_addr->basic_errno);
5129 #ifndef DISABLE_EVENT
5131 deferred_event_raise(first_addr, host, US"msg:host:defer");
5134 /* If STARTTLS was accepted, but there was a failure in setting up the
5135 TLS session (usually a certificate screwup), and the host is not in
5136 hosts_require_tls, and tls_tempfail_tryclear is true, try again, with
5137 TLS forcibly turned off. We have to start from scratch with a new SMTP
5138 connection. That's why the retry is done from here, not from within
5139 smtp_deliver(). [Rejections of STARTTLS itself don't screw up the
5140 session, so the in-clear transmission after those errors, if permitted,
5141 happens inside smtp_deliver().] */
5145 && first_addr->basic_errno == ERRNO_TLSFAILURE
5146 && ob->tls_tempfail_tryclear
5147 && verify_check_given_host(CUSS &ob->hosts_require_tls, host) != OK
5150 log_write(0, LOG_MAIN,
5151 "%s: delivering unencrypted to H=%s [%s] (not in hosts_require_tls)",
5152 first_addr->message, host->name, host->address);
5153 first_addr = prepare_addresses(addrlist, host);
5154 rc = smtp_deliver(addrlist, thost, host_af, defport, interface, tblock,
5155 &message_defer, TRUE);
5156 if (rc == DEFER && first_addr->basic_errno != ERRNO_AUTHFAIL)
5157 write_logs(host, first_addr->message, first_addr->basic_errno);
5158 # ifndef DISABLE_EVENT
5160 deferred_event_raise(first_addr, host, US"msg:host:defer");
5163 #endif /*DISABLE_TLS*/
5165 #ifndef DISABLE_EVENT
5166 /* If the last host gave a defer raise a per-message event */
5168 if (!nexthost && (message_defer || rc == DEFER))
5169 deferred_event_raise(first_addr, host, US"msg:defer");
5173 /* Delivery attempt finished */
5175 set_process_info("delivering %s: just tried %s [%s]%s for %s%s: result %s",
5176 message_id, host->name, host->address, pistring, addrlist->address,
5177 addrlist->next ? " (& others)" : "", rc_to_string(rc));
5179 /* Release serialization if set up */
5181 if (serialize_key) enq_end(serialize_key);
5183 /* If the result is DEFER, or if a host retry record is known to exist, we
5184 need to add an item to the retry chain for updating the retry database
5185 at the end of delivery. We only need to add the item to the top address,
5186 of course. Also, if DEFER, we mark the IP address unusable so as to skip it
5187 for any other delivery attempts using the same address. (It is copied into
5188 the unusable tree at the outer level, so even if different address blocks
5189 contain the same address, it still won't get tried again.) */
5191 if (rc == DEFER || retry_host_key)
5193 int delete_flag = rc != DEFER ? rf_delete : 0;
5194 if (!retry_host_key)
5197 if (exp_bool(addrlist, US"transport", tblock->name, D_transport,
5198 US"retry_include_ip_address", ob->retry_include_ip_address,
5199 ob->expand_retry_include_ip_address, &incl_ip) != OK)
5200 incl_ip = TRUE; /* error; use most-specific retry record */
5202 retry_host_key = incl_ip
5203 ? string_sprintf("T:%S:%s%s", host->name, host->address, pistring)
5204 : string_sprintf("T:%S%s", host->name, pistring);
5207 /* If a delivery of another message over an existing SMTP connection
5208 yields DEFER, we do NOT set up retry data for the host. This covers the
5209 case when there are delays in routing the addresses in the second message
5210 that are so long that the server times out. This is alleviated by not
5211 routing addresses that previously had routing defers when handling an
5212 existing connection, but even so, this case may occur (e.g. if a
5213 previously happily routed address starts giving routing defers). If the
5214 host is genuinely down, another non-continued message delivery will
5215 notice it soon enough. */
5217 if (delete_flag != 0 || !continue_hostname)
5218 retry_add_item(first_addr, retry_host_key, rf_host | delete_flag);
5220 /* We may have tried an expired host, if its retry time has come; ensure
5221 the status reflects the expiry for the benefit of any other addresses. */
5225 host->status = host_is_expired
5226 ? hstatus_unusable_expired : hstatus_unusable;
5227 host->why = hwhy_deferred;
5231 /* If message_defer is set (host was OK, but every recipient got deferred
5232 because of some message-specific problem), or if that had happened
5233 previously so that a message retry key exists, add an appropriate item
5234 to the retry chain. Note that if there was a message defer but now there is
5235 a host defer, the message defer record gets deleted. That seems perfectly
5236 reasonable. Also, stop the message from being remembered as waiting
5237 for specific hosts. */
5239 if (message_defer || retry_message_key)
5241 int delete_flag = message_defer ? 0 : rf_delete;
5242 if (!retry_message_key)
5245 if (exp_bool(addrlist, US"transport", tblock->name, D_transport,
5246 US"retry_include_ip_address", ob->retry_include_ip_address,
5247 ob->expand_retry_include_ip_address, &incl_ip) != OK)
5248 incl_ip = TRUE; /* error; use most-specific retry record */
5250 retry_message_key = incl_ip
5251 ? string_sprintf("T:%S:%s%s:%s", host->name, host->address, pistring,
5253 : string_sprintf("T:%S%s:%s", host->name, pistring, message_id);
5255 retry_add_item(addrlist, retry_message_key,
5256 rf_message | rf_host | delete_flag);
5257 update_waiting = FALSE;
5260 /* Any return other than DEFER (that is, OK or ERROR) means that the
5261 addresses have got their final statuses filled in for this host. In the OK
5262 case, see if any of them are deferred. */
5265 for (address_item * addr = addrlist; addr; addr = addr->next)
5266 if (addr->transport_return == DEFER)
5268 some_deferred = TRUE;
5272 /* If no addresses deferred or the result was ERROR, return. We do this for
5273 ERROR because a failing filter set-up or add_headers expansion is likely to
5274 fail for any host we try. */
5276 if (rc == ERROR || (rc == OK && !some_deferred))
5278 DEBUG(D_transport) debug_printf("Leaving %s transport\n", tblock->name);
5279 return TRUE; /* Each address has its status */
5282 /* If the result was DEFER or some individual addresses deferred, let
5283 the loop run to try other hosts with the deferred addresses, except for the
5284 case when we were trying to deliver down an existing channel and failed.
5285 Don't try any other hosts in this case. */
5287 if (continue_hostname) break;
5289 /* If the whole delivery, or some individual addresses, were deferred and
5290 there are more hosts that could be tried, do not count this host towards
5291 the hosts_max_try limit if the age of the message is greater than the
5292 maximum retry time for this host. This means we may try try all hosts,
5293 ignoring the limit, when messages have been around for some time. This is
5294 important because if we don't try all hosts, the address will never time
5295 out. NOTE: this does not apply to hosts_max_try_hardlimit. */
5297 if ((rc == DEFER || some_deferred) && nexthost)
5300 retry_config *retry = retry_find_config(host->name, NULL, 0, 0);
5302 if (retry && retry->rules)
5304 retry_rule *last_rule;
5305 for (last_rule = retry->rules;
5307 last_rule = last_rule->next);
5308 timedout = time(NULL) - received_time.tv_sec > last_rule->timeout;
5310 else timedout = TRUE; /* No rule => timed out */
5314 unexpired_hosts_tried--;
5315 DEBUG(D_transport) debug_printf("temporary delivery error(s) override "
5316 "hosts_max_try (message older than host's retry time)\n");
5322 if (unexpired_hosts_tried >= ob->hosts_max_try)
5323 debug_printf("reached transport hosts_max_try limit %d\n",
5325 if (total_hosts_tried >= ob->hosts_max_try_hardlimit)
5326 debug_printf("reached transport hosts_max_try_hardlimit limit %d\n",
5327 ob->hosts_max_try_hardlimit);
5330 testharness_pause_ms(500); /* let server debug out */
5331 } /* End of loop for trying multiple hosts. */
5333 /* If we failed to find a matching host in the list, for an already-open
5334 connection, just close it and start over with the list. This can happen
5335 for routing that changes from run to run, or big multi-IP sites with
5338 if (continue_hostname && !continue_host_tried)
5340 int fd = cutthrough.cctx.sock >= 0 ? cutthrough.cctx.sock : 0;
5342 DEBUG(D_transport) debug_printf("no hosts match already-open connection\n");
5344 /* A TLS conn could be open for a cutthrough, but not for a plain continued-
5346 /*XXX doublecheck that! */
5348 if (cutthrough.cctx.sock >= 0 && cutthrough.is_tls)
5350 (void) tls_write(cutthrough.cctx.tls_ctx, US"QUIT\r\n", 6, FALSE);
5351 tls_close(cutthrough.cctx.tls_ctx, TLS_SHUTDOWN_NOWAIT);
5352 cutthrough.cctx.tls_ctx = NULL;
5353 cutthrough.is_tls = FALSE;
5357 (void) write(fd, US"QUIT\r\n", 6);
5360 cutthrough.cctx.sock = -1;
5361 continue_hostname = NULL;
5362 goto retry_non_continued;
5365 /* This is the end of the loop that repeats iff expired is TRUE and
5366 ob->delay_after_cutoff is FALSE. The second time round we will
5367 try those hosts that haven't been tried since the message arrived. */
5371 debug_printf("all IP addresses skipped or deferred at least one address\n");
5372 if (expired && !ob->delay_after_cutoff && cutoff_retry == 0)
5373 debug_printf("retrying IP addresses not tried since message arrived\n");
5378 /* Get here if all IP addresses are skipped or defer at least one address. In
5379 MUA wrapper mode, this will happen only for connection or other non-message-
5380 specific failures. Force the delivery status for all addresses to FAIL. */
5384 for (address_item * addr = addrlist; addr; addr = addr->next)
5385 addr->transport_return = FAIL;
5389 /* In the normal, non-wrapper case, add a standard message to each deferred
5390 address if there hasn't been an error, that is, if it hasn't actually been
5391 tried this time. The variable "expired" will be FALSE if any deliveries were
5392 actually tried, or if there was at least one host that was not expired. That
5393 is, it is TRUE only if no deliveries were tried and all hosts were expired. If
5394 a delivery has been tried, an error code will be set, and the failing of the
5395 message is handled by the retry code later.
5397 If queue_smtp is set, or this transport was called to send a subsequent message
5398 down an existing TCP/IP connection, and something caused the host not to be
5399 found, we end up here, but can detect these cases and handle them specially. */
5401 for (address_item * addr = addrlist; addr; addr = addr->next)
5403 /* If host is not NULL, it means that we stopped processing the host list
5404 because of hosts_max_try or hosts_max_try_hardlimit. In the former case, this
5405 means we need to behave as if some hosts were skipped because their retry
5406 time had not come. Specifically, this prevents the address from timing out.
5407 However, if we have hit hosts_max_try_hardlimit, we want to behave as if all
5408 hosts were tried. */
5411 if (total_hosts_tried >= ob->hosts_max_try_hardlimit)
5414 debug_printf("hosts_max_try_hardlimit reached: behave as if all "
5415 "hosts were tried\n");
5420 debug_printf("hosts_max_try limit caused some hosts to be skipped\n");
5421 setflag(addr, af_retry_skipped);
5424 if (f.queue_smtp) /* no deliveries attempted */
5426 addr->transport_return = DEFER;
5427 addr->basic_errno = 0;
5428 addr->message = US"SMTP delivery explicitly queued";
5431 else if ( addr->transport_return == DEFER
5432 && (addr->basic_errno == ERRNO_UNKNOWNERROR || addr->basic_errno == 0)
5436 addr->basic_errno = ERRNO_HRETRY;
5437 if (continue_hostname)
5438 addr->message = US"no host found for existing SMTP connection";
5441 setflag(addr, af_pass_message); /* This is not a security risk */
5442 addr->message = string_sprintf(
5443 "all hosts%s have been failing for a long time %s",
5444 addr->domain ? string_sprintf(" for '%s'", addr->domain) : US"",
5445 ob->delay_after_cutoff
5446 ? US"(and retry time not reached)"
5447 : US"and were last tried after this message arrived");
5449 /* If we are already using fallback hosts, or there are no fallback hosts
5450 defined, convert the result to FAIL to cause a bounce. */
5452 if (addr->host_list == addr->fallback_hosts || !addr->fallback_hosts)
5453 addr->transport_return = FAIL;
5458 if (hosts_retry == hosts_total)
5459 s = "retry time not reached for any host%s";
5460 else if (hosts_fail == hosts_total)
5461 s = "all host address lookups%s failed permanently";
5462 else if (hosts_defer == hosts_total)
5463 s = "all host address lookups%s failed temporarily";
5464 else if (hosts_serial == hosts_total)
5465 s = "connection limit reached for all hosts%s";
5466 else if (hosts_fail+hosts_defer == hosts_total)
5467 s = "all host address lookups%s failed";
5469 s = "some host address lookups failed and retry time "
5470 "not reached for other hosts or connection limit reached%s";
5472 addr->message = string_sprintf(s,
5473 addr->domain ? string_sprintf(" for '%s'", addr->domain) : US"");
5478 /* Update the database which keeps information about which messages are waiting
5479 for which hosts to become available. For some message-specific errors, the
5480 update_waiting flag is turned off because we don't want follow-on deliveries in
5481 those cases. If this transport instance is explicitly limited to one message
5482 per connection then follow-on deliveries are not possible and there's no need
5483 to create/update the per-transport wait-<transport_name> database. */
5485 if (update_waiting && tblock->connection_max_messages != 1)
5486 transport_update_waiting(hostlist, tblock->name);
5490 DEBUG(D_transport) debug_printf("Leaving %s transport\n", tblock->name);
5492 return TRUE; /* Each address has its status */
5495 #endif /*!MACRO_PREDEF*/
5498 /* End of transport/smtp.c */