1 /*************************************************
2 * Exim - an Internet mail transport agent *
3 *************************************************/
5 /* Copyright (c) University of Cambridge 1995 - 2018 */
6 /* Copyright (c) The Exim Maintainers 2020 - 2021 */
7 /* See the file NOTICE for conditions of use and distribution. */
12 #if defined(SUPPORT_DANE) && defined(DISABLE_TLS)
13 # error TLS is required for DANE
17 /* Options specific to the smtp transport. This transport also supports LMTP
18 over TCP/IP. The options must be in alphabetic order (note that "_" comes
19 before the lower case letters). Some live in the transport_instance block so as
20 to be publicly visible; these are flagged with opt_public. */
22 #define LOFF(field) OPT_OFF(smtp_transport_options_block, field)
24 optionlist smtp_transport_options[] = {
25 { "*expand_multi_domain", opt_stringptr | opt_hidden | opt_public,
26 OPT_OFF(transport_instance, expand_multi_domain) },
27 { "*expand_retry_include_ip_address", opt_stringptr | opt_hidden,
28 LOFF(expand_retry_include_ip_address) },
30 { "address_retry_include_sender", opt_bool,
31 LOFF(address_retry_include_sender) },
32 { "allow_localhost", opt_bool, LOFF(allow_localhost) },
33 #ifdef EXPERIMENTAL_ARC
34 { "arc_sign", opt_stringptr, LOFF(arc_sign) },
36 { "authenticated_sender", opt_stringptr, LOFF(authenticated_sender) },
37 { "authenticated_sender_force", opt_bool, LOFF(authenticated_sender_force) },
38 { "command_timeout", opt_time, LOFF(command_timeout) },
39 { "connect_timeout", opt_time, LOFF(connect_timeout) },
40 { "connection_max_messages", opt_int | opt_public,
41 OPT_OFF(transport_instance, connection_max_messages) },
43 { "dane_require_tls_ciphers", opt_stringptr, LOFF(dane_require_tls_ciphers) },
45 { "data_timeout", opt_time, LOFF(data_timeout) },
46 { "delay_after_cutoff", opt_bool, LOFF(delay_after_cutoff) },
48 { "dkim_canon", opt_stringptr, LOFF(dkim.dkim_canon) },
49 { "dkim_domain", opt_stringptr, LOFF(dkim.dkim_domain) },
50 { "dkim_hash", opt_stringptr, LOFF(dkim.dkim_hash) },
51 { "dkim_identity", opt_stringptr, LOFF(dkim.dkim_identity) },
52 { "dkim_private_key", opt_stringptr, LOFF(dkim.dkim_private_key) },
53 { "dkim_selector", opt_stringptr, LOFF(dkim.dkim_selector) },
54 { "dkim_sign_headers", opt_stringptr, LOFF(dkim.dkim_sign_headers) },
55 { "dkim_strict", opt_stringptr, LOFF(dkim.dkim_strict) },
56 { "dkim_timestamps", opt_stringptr, LOFF(dkim.dkim_timestamps) },
58 { "dns_qualify_single", opt_bool, LOFF(dns_qualify_single) },
59 { "dns_search_parents", opt_bool, LOFF(dns_search_parents) },
60 { "dnssec_request_domains", opt_stringptr, LOFF(dnssec.request) },
61 { "dnssec_require_domains", opt_stringptr, LOFF(dnssec.require) },
62 { "dscp", opt_stringptr, LOFF(dscp) },
63 { "fallback_hosts", opt_stringptr, LOFF(fallback_hosts) },
64 { "final_timeout", opt_time, LOFF(final_timeout) },
65 { "gethostbyname", opt_bool, LOFF(gethostbyname) },
66 { "helo_data", opt_stringptr, LOFF(helo_data) },
67 { "hosts", opt_stringptr, LOFF(hosts) },
68 { "hosts_avoid_esmtp", opt_stringptr, LOFF(hosts_avoid_esmtp) },
69 { "hosts_avoid_pipelining", opt_stringptr, LOFF(hosts_avoid_pipelining) },
71 { "hosts_avoid_tls", opt_stringptr, LOFF(hosts_avoid_tls) },
73 { "hosts_max_try", opt_int, LOFF(hosts_max_try) },
74 { "hosts_max_try_hardlimit", opt_int, LOFF(hosts_max_try_hardlimit) },
76 { "hosts_nopass_tls", opt_stringptr, LOFF(hosts_nopass_tls) },
77 { "hosts_noproxy_tls", opt_stringptr, LOFF(hosts_noproxy_tls) },
79 { "hosts_override", opt_bool, LOFF(hosts_override) },
80 #ifndef DISABLE_PIPE_CONNECT
81 { "hosts_pipe_connect", opt_stringptr, LOFF(hosts_pipe_connect) },
83 { "hosts_randomize", opt_bool, LOFF(hosts_randomize) },
84 #if !defined(DISABLE_TLS) && !defined(DISABLE_OCSP)
85 { "hosts_request_ocsp", opt_stringptr, LOFF(hosts_request_ocsp) },
87 { "hosts_require_alpn", opt_stringptr, LOFF(hosts_require_alpn) },
88 { "hosts_require_auth", opt_stringptr, LOFF(hosts_require_auth) },
91 { "hosts_require_dane", opt_stringptr, LOFF(hosts_require_dane) },
94 { "hosts_require_ocsp", opt_stringptr, LOFF(hosts_require_ocsp) },
96 { "hosts_require_tls", opt_stringptr, LOFF(hosts_require_tls) },
98 { "hosts_try_auth", opt_stringptr, LOFF(hosts_try_auth) },
99 { "hosts_try_chunking", opt_stringptr, LOFF(hosts_try_chunking) },
101 { "hosts_try_dane", opt_stringptr, LOFF(hosts_try_dane) },
103 { "hosts_try_fastopen", opt_stringptr, LOFF(hosts_try_fastopen) },
105 { "hosts_try_prdr", opt_stringptr, LOFF(hosts_try_prdr) },
108 { "hosts_verify_avoid_tls", opt_stringptr, LOFF(hosts_verify_avoid_tls) },
110 { "interface", opt_stringptr, LOFF(interface) },
111 { "keepalive", opt_bool, LOFF(keepalive) },
112 { "lmtp_ignore_quota", opt_bool, LOFF(lmtp_ignore_quota) },
113 { "max_rcpt", opt_int | opt_public,
114 OPT_OFF(transport_instance, max_addresses) },
115 { "message_linelength_limit", opt_int, LOFF(message_linelength_limit) },
116 { "multi_domain", opt_expand_bool | opt_public,
117 OPT_OFF(transport_instance, multi_domain) },
118 { "port", opt_stringptr, LOFF(port) },
119 { "protocol", opt_stringptr, LOFF(protocol) },
120 { "retry_include_ip_address", opt_expand_bool, LOFF(retry_include_ip_address) },
121 { "serialize_hosts", opt_stringptr, LOFF(serialize_hosts) },
122 { "size_addition", opt_int, LOFF(size_addition) },
124 { "socks_proxy", opt_stringptr, LOFF(socks_proxy) },
127 { "tls_alpn", opt_stringptr, LOFF(tls_alpn) },
128 { "tls_certificate", opt_stringptr, LOFF(tls_certificate) },
129 { "tls_crl", opt_stringptr, LOFF(tls_crl) },
130 { "tls_dh_min_bits", opt_int, LOFF(tls_dh_min_bits) },
131 { "tls_privatekey", opt_stringptr, LOFF(tls_privatekey) },
132 { "tls_require_ciphers", opt_stringptr, LOFF(tls_require_ciphers) },
133 # ifndef DISABLE_TLS_RESUME
134 { "tls_resumption_hosts", opt_stringptr, LOFF(tls_resumption_hosts) },
136 { "tls_sni", opt_stringptr, LOFF(tls_sni) },
137 { "tls_tempfail_tryclear", opt_bool, LOFF(tls_tempfail_tryclear) },
138 { "tls_try_verify_hosts", opt_stringptr, LOFF(tls_try_verify_hosts) },
139 { "tls_verify_cert_hostnames", opt_stringptr, LOFF(tls_verify_cert_hostnames)},
140 { "tls_verify_certificates", opt_stringptr, LOFF(tls_verify_certificates) },
141 { "tls_verify_hosts", opt_stringptr, LOFF(tls_verify_hosts) },
144 { "utf8_downconvert", opt_stringptr, LOFF(utf8_downconvert) },
148 /* Size of the options list. An extern variable has to be used so that its
149 address can appear in the tables drtables.c. */
151 int smtp_transport_options_count = nelem(smtp_transport_options);
157 smtp_transport_options_block smtp_transport_option_defaults = {0};
158 void smtp_transport_init(transport_instance *tblock) {}
159 BOOL smtp_transport_entry(transport_instance *tblock, address_item *addr) {return FALSE;}
160 void smtp_transport_closedown(transport_instance *tblock) {}
162 #else /*!MACRO_PREDEF*/
165 /* Default private options block for the smtp transport. */
167 smtp_transport_options_block smtp_transport_option_defaults = {
168 /* All non-mentioned elements 0/NULL/FALSE */
169 .helo_data = US"$primary_hostname",
170 .protocol = US"smtp",
171 .hosts_try_chunking = US"*",
173 .hosts_try_dane = US"*",
175 .hosts_try_fastopen = US"*",
177 .hosts_try_prdr = US"*",
180 .hosts_request_ocsp = US"*", /* hosts_request_ocsp (except under DANE; tls_client_start()) */
182 .command_timeout = 5*60,
183 .connect_timeout = 5*60,
184 .data_timeout = 5*60,
185 .final_timeout = 10*60,
186 .size_addition = 1024,
188 .hosts_max_try_hardlimit = 50,
189 .message_linelength_limit = 998,
190 .address_retry_include_sender = TRUE,
191 .dns_qualify_single = TRUE,
192 .dnssec = { .request= US"*", .require=NULL },
193 .delay_after_cutoff = TRUE,
195 .retry_include_ip_address = TRUE,
197 .tls_verify_certificates = US"system",
198 .tls_dh_min_bits = EXIM_CLIENT_DH_DEFAULT_MIN_BITS,
199 .tls_tempfail_tryclear = TRUE,
200 .tls_try_verify_hosts = US"*",
201 .tls_verify_cert_hostnames = US"*",
204 .utf8_downconvert = US"-1",
208 { .dkim_hash = US"sha256", },
212 /* some DSN flags for use later */
214 static int rf_list[] = {rf_notify_never, rf_notify_success,
215 rf_notify_failure, rf_notify_delay };
217 static uschar *rf_names[] = { US"NEVER", US"SUCCESS", US"FAILURE", US"DELAY" };
223 static uschar *smtp_command; /* Points to last cmd for error messages */
224 static uschar *mail_command; /* Points to MAIL cmd for error messages */
225 static uschar *data_command = US""; /* Points to DATA cmd for error messages */
226 static BOOL update_waiting; /* TRUE to update the "wait" database */
228 /*XXX move to smtp_context */
229 static BOOL pipelining_active; /* current transaction is in pipe mode */
232 static unsigned ehlo_response(uschar * buf, unsigned checks);
235 /******************************************************************************/
238 smtp_deliver_init(void)
242 const pcre2_code ** re;
243 const uschar * string;
246 { ®ex_AUTH, AUTHS_REGEX },
247 { ®ex_CHUNKING, US"\\n250[\\s\\-]CHUNKING(\\s|\\n|$)" },
248 { ®ex_DSN, US"\\n250[\\s\\-]DSN(\\s|\\n|$)" },
249 { ®ex_IGNOREQUOTA, US"\\n250[\\s\\-]IGNOREQUOTA(\\s|\\n|$)" },
250 { ®ex_PIPELINING, US"\\n250[\\s\\-]PIPELINING(\\s|\\n|$)" },
251 { ®ex_SIZE, US"\\n250[\\s\\-]SIZE(\\s|\\n|$)" },
254 { ®ex_STARTTLS, US"\\n250[\\s\\-]STARTTLS(\\s|\\n|$)" },
257 { ®ex_PRDR, US"\\n250[\\s\\-]PRDR(\\s|\\n|$)" },
260 { ®ex_UTF8, US"\\n250[\\s\\-]SMTPUTF8(\\s|\\n|$)" },
262 #ifndef DISABLE_PIPE_CONNECT
263 { ®ex_EARLY_PIPE, US"\\n250[\\s\\-]" EARLY_PIPE_FEATURE_NAME "(\\s|\\n|$)" },
265 #ifdef EXPERIMENTAL_ESMTP_LIMITS
266 { ®ex_LIMITS, US"\\n250[\\s\\-]LIMITS\\s" },
270 for (struct list * l = list; l < list + nelem(list); l++)
272 *l->re = regex_must_compile(l->string, FALSE, TRUE);
276 /*************************************************
277 * Setup entry point *
278 *************************************************/
280 /* This function is called when the transport is about to be used,
281 but before running it in a sub-process. It is used for two things:
283 (1) To set the fallback host list in addresses, when delivering.
284 (2) To pass back the interface, port, protocol, and other options, for use
285 during callout verification.
288 tblock pointer to the transport instance block
289 addrlist list of addresses about to be transported
290 tf if not NULL, pointer to block in which to return options
291 uid the uid that will be set (not used)
292 gid the gid that will be set (not used)
293 errmsg place for error message (not used)
295 Returns: OK always (FAIL, DEFER not used)
299 smtp_transport_setup(transport_instance *tblock, address_item *addrlist,
300 transport_feedback *tf, uid_t uid, gid_t gid, uschar **errmsg)
302 smtp_transport_options_block *ob = SOB tblock->options_block;
304 /* Pass back options if required. This interface is getting very messy. */
308 tf->interface = ob->interface;
310 tf->protocol = ob->protocol;
311 tf->hosts = ob->hosts;
312 tf->hosts_override = ob->hosts_override;
313 tf->hosts_randomize = ob->hosts_randomize;
314 tf->gethostbyname = ob->gethostbyname;
315 tf->qualify_single = ob->dns_qualify_single;
316 tf->search_parents = ob->dns_search_parents;
317 tf->helo_data = ob->helo_data;
320 /* Set the fallback host list for all the addresses that don't have fallback
321 host lists, provided that the local host wasn't present in the original host
324 if (!testflag(addrlist, af_local_host_removed))
325 for (; addrlist; addrlist = addrlist->next)
326 if (!addrlist->fallback_hosts) addrlist->fallback_hosts = ob->fallback_hostlist;
333 /*************************************************
334 * Initialization entry point *
335 *************************************************/
337 /* Called for each instance, after its options have been read, to
338 enable consistency checks to be done, or anything else that needs
341 Argument: pointer to the transport instance block
346 smtp_transport_init(transport_instance *tblock)
348 smtp_transport_options_block *ob = SOB tblock->options_block;
349 int old_pool = store_pool;
351 /* Retry_use_local_part defaults FALSE if unset */
353 if (tblock->retry_use_local_part == TRUE_UNSET)
354 tblock->retry_use_local_part = FALSE;
356 /* Set the default port according to the protocol */
359 ob->port = strcmpic(ob->protocol, US"lmtp") == 0
361 : strcmpic(ob->protocol, US"smtps") == 0
362 ? US"smtps" : US"smtp";
364 /* Set up the setup entry point, to be called before subprocesses for this
367 tblock->setup = smtp_transport_setup;
369 /* Complain if any of the timeouts are zero. */
371 if (ob->command_timeout <= 0 || ob->data_timeout <= 0 ||
372 ob->final_timeout <= 0)
373 log_write(0, LOG_PANIC_DIE|LOG_CONFIG,
374 "command, data, or final timeout value is zero for %s transport",
377 /* If hosts_override is set and there are local hosts, set the global
378 flag that stops verify from showing router hosts. */
380 if (ob->hosts_override && ob->hosts) tblock->overrides_hosts = TRUE;
382 /* If there are any fallback hosts listed, build a chain of host items
383 for them, but do not do any lookups at this time. */
385 store_pool = POOL_PERM;
386 host_build_hostlist(&ob->fallback_hostlist, ob->fallback_hosts, FALSE);
387 store_pool = old_pool;
394 /*************************************************
395 * Set delivery info into all active addresses *
396 *************************************************/
398 /* Only addresses whose status is >= PENDING are relevant. A lesser
399 status means that an address is not currently being processed.
402 addrlist points to a chain of addresses
403 errno_value to put in each address's errno field
404 msg to put in each address's message field
405 rc to put in each address's transport_return field
406 pass_message if TRUE, set the "pass message" flag in the address
407 host if set, mark addrs as having used this host
408 smtp_greeting from peer
409 helo_response from peer
410 start points to timestamp of delivery start
412 If errno_value has the special value ERRNO_CONNECTTIMEOUT, ETIMEDOUT is put in
413 the errno field, and RTEF_CTOUT is ORed into the more_errno field, to indicate
414 this particular type of timeout.
420 set_errno(address_item *addrlist, int errno_value, uschar *msg, int rc,
421 BOOL pass_message, host_item * host,
422 #ifdef EXPERIMENTAL_DSN_INFO
423 const uschar * smtp_greeting, const uschar * helo_response,
425 struct timeval * start
429 struct timeval deliver_time;
431 if (errno_value == ERRNO_CONNECTTIMEOUT)
433 errno_value = ETIMEDOUT;
434 orvalue = RTEF_CTOUT;
436 timesince(&deliver_time, start);
438 for (address_item * addr = addrlist; addr; addr = addr->next)
439 if (addr->transport_return >= PENDING)
441 addr->basic_errno = errno_value;
442 addr->more_errno |= orvalue;
443 addr->delivery_time = deliver_time;
447 if (pass_message) setflag(addr, af_pass_message);
449 addr->transport_return = rc;
452 addr->host_used = host;
453 #ifdef EXPERIMENTAL_DSN_INFO
455 {uschar * s = Ustrchr(smtp_greeting, '\n'); if (s) *s = '\0';}
456 addr->smtp_greeting = smtp_greeting;
459 {uschar * s = Ustrchr(helo_response, '\n'); if (s) *s = '\0';}
460 addr->helo_response = helo_response;
467 set_errno_nohost(address_item * addrlist, int errno_value, uschar * msg, int rc,
468 BOOL pass_message, struct timeval * start)
470 set_errno(addrlist, errno_value, msg, rc, pass_message, NULL,
471 #ifdef EXPERIMENTAL_DSN_INFO
478 /*************************************************
479 * Check an SMTP response *
480 *************************************************/
482 /* This function is given an errno code and the SMTP response buffer
483 to analyse, together with the host identification for generating messages. It
484 sets an appropriate message and puts the first digit of the response code into
485 the yield variable. If no response was actually read, a suitable digit is
489 host the current host, to get its name for messages
490 errno_value pointer to the errno value
491 more_errno from the top address for use with ERRNO_FILTER_FAIL
492 buffer the SMTP response buffer
493 yield where to put a one-digit SMTP response code
494 message where to put an error message
495 pass_message set TRUE if message is an SMTP response
497 Returns: TRUE if an SMTP "QUIT" command should be sent, else FALSE
501 check_response(host_item *host, int *errno_value, int more_errno,
502 uschar *buffer, int *yield, uschar **message, BOOL *pass_message)
504 uschar * pl = pipelining_active ? US"pipelined " : US"";
507 *yield = '4'; /* Default setting is to give a temporary error */
511 case ETIMEDOUT: /* Handle response timeout */
512 *message = US string_sprintf("SMTP timeout after %s%s",
514 if (transport_count > 0)
515 *message = US string_sprintf("%s (%d bytes written)", *message,
519 case ERRNO_SMTPFORMAT: /* Handle malformed SMTP response */
520 s = string_printing(buffer);
521 while (isspace(*s)) s++;
523 ? string_sprintf("Malformed SMTP reply (an empty line) "
524 "in response to %s%s", pl, smtp_command)
525 : string_sprintf("Malformed SMTP reply in response to %s%s: %s",
526 pl, smtp_command, s);
529 case ERRNO_TLSFAILURE: /* Handle bad first read; can happen with
531 *message = US"bad first read from TLS conn";
534 case ERRNO_FILTER_FAIL: /* Handle a failed filter process error;
535 can't send QUIT as we mustn't end the DATA. */
536 *message = string_sprintf("transport filter process failed (%d)%s",
538 more_errno == EX_EXECFAILED ? ": unable to execute command" : "");
541 case ERRNO_CHHEADER_FAIL: /* Handle a failed add_headers expansion;
542 can't send QUIT as we mustn't end the DATA. */
544 string_sprintf("failed to expand headers_add or headers_remove: %s",
545 expand_string_message);
548 case ERRNO_WRITEINCOMPLETE: /* failure to write a complete data block */
549 *message = US"failed to write a data block";
553 case ERRNO_UTF8_FWD: /* no advertised SMTPUTF8, for international message */
554 *message = US"utf8 support required but not offered for forwarding";
555 DEBUG(D_deliver|D_transport) debug_printf("%s\n", *message);
560 /* Handle error responses from the remote mailer. */
564 *message = string_sprintf("SMTP error from remote mail server after %s%s: "
565 "%s", pl, smtp_command, s = string_printing(buffer));
566 *pass_message = TRUE;
571 /* No data was read. If there is no errno, this must be the EOF (i.e.
572 connection closed) case, which causes deferral. An explicit connection reset
573 error has the same effect. Otherwise, put the host's identity in the message,
574 leaving the errno value to be interpreted as well. In all cases, we have to
575 assume the connection is now dead. */
577 if (*errno_value == 0 || *errno_value == ECONNRESET)
579 *errno_value = ERRNO_SMTPCLOSED;
580 *message = US string_sprintf("Remote host closed connection "
581 "in response to %s%s", pl, smtp_command);
584 *message = US string_sprintf("%s [%s]", host->name, host->address);
591 /*************************************************
592 * Write error message to logs *
593 *************************************************/
595 /* This writes to the main log and to the message log.
598 host the current host
599 detail the current message (addr_item->message)
600 basic_errno the errno (addr_item->basic_errno)
606 write_logs(const host_item *host, const uschar *suffix, int basic_errno)
608 gstring * message = LOGGING(outgoing_port)
609 ? string_fmt_append(NULL, "H=%s [%s]:%d", host->name, host->address,
610 host->port == PORT_NONE ? 25 : host->port)
611 : string_fmt_append(NULL, "H=%s [%s]", host->name, host->address);
615 message = string_fmt_append(message, ": %s", suffix);
617 message = string_fmt_append(message, ": %s", strerror(basic_errno));
620 message = string_fmt_append(message, " %s", exim_errstr(basic_errno));
622 log_write(0, LOG_MAIN, "%s", string_from_gstring(message));
623 deliver_msglog("%s %s\n", tod_stamp(tod_log), message->s);
627 msglog_line(host_item * host, uschar * message)
629 deliver_msglog("%s H=%s [%s] %s\n", tod_stamp(tod_log),
630 host->name, host->address, message);
635 #ifndef DISABLE_EVENT
636 /*************************************************
637 * Post-defer action *
638 *************************************************/
640 /* This expands an arbitrary per-transport string.
641 It might, for example, be used to write to the database log.
644 addr the address item containing error information
645 host the current host
652 deferred_event_raise(address_item * addr, host_item * host, uschar * evstr)
654 uschar * action = addr->transport->event_action;
655 const uschar * save_domain;
661 save_domain = deliver_domain;
662 save_local = deliver_localpart;
664 /*XXX would ip & port already be set up? */
665 deliver_host_address = string_copy(host->address);
666 deliver_host_port = host->port == PORT_NONE ? 25 : host->port;
667 event_defer_errno = addr->basic_errno;
669 router_name = addr->router->name;
670 transport_name = addr->transport->name;
671 deliver_domain = addr->domain;
672 deliver_localpart = addr->local_part;
674 (void) event_raise(action, evstr,
676 ? addr->basic_errno > 0
677 ? string_sprintf("%s: %s", addr->message, strerror(addr->basic_errno))
678 : string_copy(addr->message)
679 : addr->basic_errno > 0
680 ? string_copy(US strerror(addr->basic_errno))
684 deliver_localpart = save_local;
685 deliver_domain = save_domain;
686 router_name = transport_name = NULL;
690 /*************************************************
691 * Reap SMTP specific responses *
692 *************************************************/
694 smtp_discard_responses(smtp_context * sx, smtp_transport_options_block * ob,
697 uschar flushbuffer[4096];
701 if (!smtp_read_response(sx, flushbuffer, sizeof(flushbuffer),
702 '2', ob->command_timeout)
703 && (errno != 0 || flushbuffer[0] == 0))
710 /* Return boolean success */
713 smtp_reap_banner(smtp_context * sx)
716 #if defined(__linux__) && defined(TCP_QUICKACK)
717 { /* Hack to get QUICKACK disabled; has to be right after 3whs, and has to on->off */
718 int sock = sx->cctx.sock;
719 struct pollfd p = {.fd = sock, .events = POLLOUT};
720 if (poll(&p, 1, 1000) >= 0) /* retval test solely for compiler quitening */
722 (void) setsockopt(sock, IPPROTO_TCP, TCP_QUICKACK, US &on, sizeof(on));
723 (void) setsockopt(sock, IPPROTO_TCP, TCP_QUICKACK, US &off, sizeof(off));
727 good_response = smtp_read_response(sx, sx->buffer, sizeof(sx->buffer),
728 '2', (SOB sx->conn_args.ob)->command_timeout);
729 #ifdef EXPERIMENTAL_DSN_INFO
730 sx->smtp_greeting = string_copy(sx->buffer);
732 return good_response;
736 smtp_reap_ehlo(smtp_context * sx)
738 if (!smtp_read_response(sx, sx->buffer, sizeof(sx->buffer), '2',
739 (SOB sx->conn_args.ob)->command_timeout))
741 if (errno != 0 || sx->buffer[0] == 0 || sx->lmtp)
743 #ifdef EXPERIMENTAL_DSN_INFO
744 sx->helo_response = string_copy(sx->buffer);
750 #ifdef EXPERIMENTAL_DSN_INFO
751 sx->helo_response = string_copy(sx->buffer);
753 #ifndef DISABLE_EVENT
754 (void) event_raise(sx->conn_args.tblock->event_action,
755 US"smtp:ehlo", sx->buffer, NULL);
761 /******************************************************************************/
763 #ifdef EXPERIMENTAL_ESMTP_LIMITS
764 /* If TLS, or TLS not offered, called with the EHLO response in the buffer.
765 Check it for a LIMITS keyword and parse values into the smtp context structure.
767 We don't bother with peers that we won't talk TLS to, even though they can,
768 just ignore their LIMITS advice (if any) and treat them as if they do not.
769 This saves us dealing with a duplicate set of values. */
772 ehlo_response_limits_read(smtp_context * sx)
776 /* matches up to just after the first space after the keyword */
778 if (regex_match(regex_LIMITS, sx->buffer, -1, &match))
779 for (const uschar * s = sx->buffer + Ustrlen(match); *s; )
781 while (isspace(*s)) s++;
782 if (*s == '\n') break;
784 if (strncmpic(s, US"MAILMAX=", 8) == 0)
786 sx->peer_limit_mail = atoi(CS (s += 8));
787 while (isdigit(*s)) s++;
789 else if (strncmpic(s, US"RCPTMAX=", 8) == 0)
791 sx->peer_limit_rcpt = atoi(CS (s += 8));
792 while (isdigit(*s)) s++;
794 else if (strncmpic(s, US"RCPTDOMAINMAX=", 14) == 0)
796 sx->peer_limit_rcptdom = atoi(CS (s += 14));
797 while (isdigit(*s)) s++;
800 while (*s && !isspace(*s)) s++;
804 /* Apply given values to the current connection */
806 ehlo_limits_apply(smtp_context * sx,
807 unsigned limit_mail, unsigned limit_rcpt, unsigned limit_rcptdom)
809 if (limit_mail && limit_mail < sx->max_mail) sx->max_mail = limit_mail;
810 if (limit_rcpt && limit_rcpt < sx->max_rcpt) sx->max_rcpt = limit_rcpt;
813 DEBUG(D_transport) debug_printf("will treat as !multi_domain\n");
814 sx->single_rcpt_domain = TRUE;
818 /* Apply values from EHLO-resp to the current connection */
820 ehlo_response_limits_apply(smtp_context * sx)
822 ehlo_limits_apply(sx, sx->peer_limit_mail, sx->peer_limit_rcpt,
823 sx->peer_limit_rcptdom);
826 /* Apply values read from cache to the current connection */
828 ehlo_cache_limits_apply(smtp_context * sx)
830 ehlo_limits_apply(sx, sx->ehlo_resp.limit_mail, sx->ehlo_resp.limit_rcpt,
831 sx->ehlo_resp.limit_rcptdom);
835 /******************************************************************************/
837 #ifndef DISABLE_PIPE_CONNECT
839 ehlo_cache_key(const smtp_context * sx)
841 host_item * host = sx->conn_args.host;
842 return Ustrchr(host->address, ':')
843 ? string_sprintf("[%s]:%d.EHLO", host->address,
844 host->port == PORT_NONE ? sx->port : host->port)
845 : string_sprintf("%s:%d.EHLO", host->address,
846 host->port == PORT_NONE ? sx->port : host->port);
849 /* Cache EHLO-response info for use by early-pipe.
851 - During a normal flow on EHLO response (either cleartext or under TLS),
852 when we are willing to do PIPECONNECT and it is offered
853 - During an early-pipe flow on receiving the actual EHLO response and noting
854 disparity versus the cached info used, when PIPECONNECT is still being offered
856 We assume that suitable values have been set in the sx.ehlo_resp structure for
857 features and auths; we handle the copy of limits. */
860 write_ehlo_cache_entry(smtp_context * sx)
862 open_db dbblock, * dbm_file;
864 #ifdef EXPERIMENTAL_ESMTP_LIMITS
865 sx->ehlo_resp.limit_mail = sx->peer_limit_mail;
866 sx->ehlo_resp.limit_rcpt = sx->peer_limit_rcpt;
867 sx->ehlo_resp.limit_rcptdom = sx->peer_limit_rcptdom;
870 if ((dbm_file = dbfn_open(US"misc", O_RDWR, &dbblock, TRUE, TRUE)))
872 uschar * ehlo_resp_key = ehlo_cache_key(sx);
873 dbdata_ehlo_resp er = { .data = sx->ehlo_resp };
876 #ifdef EXPERIMENTAL_ESMTP_LIMITS
877 if (sx->ehlo_resp.limit_mail || sx->ehlo_resp.limit_rcpt || sx->ehlo_resp.limit_rcptdom)
878 debug_printf("writing clr %04x/%04x cry %04x/%04x lim %05d/%05d/%05d\n",
879 sx->ehlo_resp.cleartext_features, sx->ehlo_resp.cleartext_auths,
880 sx->ehlo_resp.crypted_features, sx->ehlo_resp.crypted_auths,
881 sx->ehlo_resp.limit_mail, sx->ehlo_resp.limit_rcpt,
882 sx->ehlo_resp.limit_rcptdom);
885 debug_printf("writing clr %04x/%04x cry %04x/%04x\n",
886 sx->ehlo_resp.cleartext_features, sx->ehlo_resp.cleartext_auths,
887 sx->ehlo_resp.crypted_features, sx->ehlo_resp.crypted_auths);
889 dbfn_write(dbm_file, ehlo_resp_key, &er, (int)sizeof(er));
890 dbfn_close(dbm_file);
895 invalidate_ehlo_cache_entry(smtp_context * sx)
897 open_db dbblock, * dbm_file;
899 if ( sx->early_pipe_active
900 && (dbm_file = dbfn_open(US"misc", O_RDWR, &dbblock, TRUE, TRUE)))
902 uschar * ehlo_resp_key = ehlo_cache_key(sx);
903 dbfn_delete(dbm_file, ehlo_resp_key);
904 dbfn_close(dbm_file);
909 read_ehlo_cache_entry(smtp_context * sx)
914 if (!(dbm_file = dbfn_open(US"misc", O_RDONLY, &dbblock, FALSE, TRUE)))
915 { DEBUG(D_transport) debug_printf("ehlo-cache: no misc DB\n"); }
918 uschar * ehlo_resp_key = ehlo_cache_key(sx);
919 dbdata_ehlo_resp * er;
921 if (!(er = dbfn_read_enforce_length(dbm_file, ehlo_resp_key, sizeof(dbdata_ehlo_resp))))
922 { DEBUG(D_transport) debug_printf("no ehlo-resp record\n"); }
923 else if (time(NULL) - er->time_stamp > retry_data_expire)
925 DEBUG(D_transport) debug_printf("ehlo-resp record too old\n");
926 dbfn_close(dbm_file);
927 if ((dbm_file = dbfn_open(US"misc", O_RDWR, &dbblock, TRUE, TRUE)))
928 dbfn_delete(dbm_file, ehlo_resp_key);
933 #ifdef EXPERIMENTAL_ESMTP_LIMITS
934 if (er->data.limit_mail || er->data.limit_rcpt || er->data.limit_rcptdom)
935 debug_printf("EHLO response bits from cache:"
936 " cleartext 0x%04x/0x%04x crypted 0x%04x/0x%04x lim %05d/%05d/%05d\n",
937 er->data.cleartext_features, er->data.cleartext_auths,
938 er->data.crypted_features, er->data.crypted_auths,
939 er->data.limit_mail, er->data.limit_rcpt, er->data.limit_rcptdom);
942 debug_printf("EHLO response bits from cache:"
943 " cleartext 0x%04x/0x%04x crypted 0x%04x/0x%04x\n",
944 er->data.cleartext_features, er->data.cleartext_auths,
945 er->data.crypted_features, er->data.crypted_auths);
947 sx->ehlo_resp = er->data;
948 #ifdef EXPERIMENTAL_ESMTP_LIMITS
949 ehlo_cache_limits_apply(sx);
951 dbfn_close(dbm_file);
954 dbfn_close(dbm_file);
961 /* Return an auths bitmap for the set of AUTH methods offered by the server
962 which match our authenticators. */
964 static unsigned short
965 study_ehlo_auths(smtp_context * sx)
970 unsigned short authbits = 0;
972 if (!sx->esmtp) return 0;
973 if (!regex_AUTH) regex_AUTH = regex_must_compile(AUTHS_REGEX, FALSE, TRUE);
974 if (!regex_match_and_setup(regex_AUTH, sx->buffer, 0, -1)) return 0;
975 expand_nmax = -1; /* reset */
976 names = string_copyn(expand_nstring[1], expand_nlength[1]);
978 for (au = auths, authnum = 0; au; au = au->next, authnum++) if (au->client)
980 const uschar * list = names;
982 for (int sep = ' '; s = string_nextinlist(&list, &sep, NULL, 0); )
983 if (strcmpic(au->public_name, s) == 0)
984 { authbits |= BIT(authnum); break; }
988 debug_printf("server offers %s AUTH, methods '%s', bitmap 0x%04x\n",
989 tls_out.active.sock >= 0 ? "crypted" : "plaintext", names, authbits);
991 if (tls_out.active.sock >= 0)
992 sx->ehlo_resp.crypted_auths = authbits;
994 sx->ehlo_resp.cleartext_auths = authbits;
1001 /* Wait for and check responses for early-pipelining.
1003 Called from the lower-level smtp_read_response() function
1004 used for general code that assume synchronisation, if context
1005 flags indicate outstanding early-pipelining commands. Also
1006 called fom sync_responses() which handles pipelined commands.
1009 sx smtp connection context
1010 countp number of outstanding responses, adjusted on return
1014 DEFER error on first read of TLS'd conn
1015 FAIL SMTP error in response
1018 smtp_reap_early_pipe(smtp_context * sx, int * countp)
1020 BOOL pending_BANNER = sx->pending_BANNER;
1021 BOOL pending_EHLO = sx->pending_EHLO;
1024 sx->pending_BANNER = FALSE; /* clear early to avoid recursion */
1025 sx->pending_EHLO = FALSE;
1029 DEBUG(D_transport) debug_printf("%s expect banner\n", __FUNCTION__);
1031 if (!smtp_reap_banner(sx))
1033 DEBUG(D_transport) debug_printf("bad banner\n");
1034 if (tls_out.active.sock >= 0) rc = DEFER;
1041 unsigned peer_offered;
1042 unsigned short authbits = 0, * ap;
1044 DEBUG(D_transport) debug_printf("%s expect ehlo\n", __FUNCTION__);
1046 if (!smtp_reap_ehlo(sx))
1048 DEBUG(D_transport) debug_printf("bad response for EHLO\n");
1049 if (tls_out.active.sock >= 0) rc = DEFER;
1053 /* Compare the actual EHLO response extensions and AUTH methods to the cached
1054 value we assumed; on difference, dump or rewrite the cache and arrange for a
1057 ap = tls_out.active.sock < 0
1058 ? &sx->ehlo_resp.cleartext_auths : &sx->ehlo_resp.crypted_auths;
1060 peer_offered = ehlo_response(sx->buffer,
1061 (tls_out.active.sock < 0 ? OPTION_TLS : 0)
1062 | OPTION_CHUNKING | OPTION_PRDR | OPTION_DSN | OPTION_PIPE | OPTION_SIZE
1063 | OPTION_UTF8 | OPTION_EARLY_PIPE
1065 #ifdef EXPERIMENTAL_ESMTP_LIMITS
1066 if (tls_out.active.sock >= 0 || !(peer_offered & OPTION_TLS))
1067 ehlo_response_limits_read(sx);
1069 if ( peer_offered != sx->peer_offered
1070 || (authbits = study_ehlo_auths(sx)) != *ap)
1073 debug_printf("EHLO %s extensions changed, 0x%04x/0x%04x -> 0x%04x/0x%04x\n",
1074 tls_out.active.sock < 0 ? "cleartext" : "crypted",
1075 sx->peer_offered, *ap, peer_offered, authbits);
1076 if (peer_offered & OPTION_EARLY_PIPE)
1078 *(tls_out.active.sock < 0
1079 ? &sx->ehlo_resp.cleartext_features : &sx->ehlo_resp.crypted_features) =
1082 write_ehlo_cache_entry(sx);
1085 invalidate_ehlo_cache_entry(sx);
1087 return OK; /* just carry on */
1089 #ifdef EXPERIMENTAL_ESMTP_LIMITS
1090 /* If we are handling LIMITS, compare the actual EHLO LIMITS values with the
1091 cached values and invalidate cache if different. OK to carry on with
1092 connect since values are advisory. */
1094 if ( (tls_out.active.sock >= 0 || !(peer_offered & OPTION_TLS))
1095 && ( sx->peer_limit_mail != sx->ehlo_resp.limit_mail
1096 || sx->peer_limit_rcpt != sx->ehlo_resp.limit_rcpt
1097 || sx->peer_limit_rcptdom != sx->ehlo_resp.limit_rcptdom
1102 debug_printf("EHLO LIMITS changed:");
1103 if (sx->peer_limit_mail != sx->ehlo_resp.limit_mail)
1104 debug_printf(" MAILMAX %u -> %u\n", sx->ehlo_resp.limit_mail, sx->peer_limit_mail);
1105 else if (sx->peer_limit_rcpt != sx->ehlo_resp.limit_rcpt)
1106 debug_printf(" RCPTMAX %u -> %u\n", sx->ehlo_resp.limit_rcpt, sx->peer_limit_rcpt);
1108 debug_printf(" RCPTDOMAINMAX %u -> %u\n", sx->ehlo_resp.limit_rcptdom, sx->peer_limit_rcptdom);
1110 invalidate_ehlo_cache_entry(sx);
1118 invalidate_ehlo_cache_entry(sx);
1119 (void) smtp_discard_responses(sx, sx->conn_args.ob, *countp);
1122 #endif /*!DISABLE_PIPE_CONNECT*/
1125 /*************************************************
1126 * Synchronize SMTP responses *
1127 *************************************************/
1129 /* This function is called from smtp_deliver() to receive SMTP responses from
1130 the server, and match them up with the commands to which they relate. When
1131 PIPELINING is not in use, this function is called after every command, and is
1132 therefore somewhat over-engineered, but it is simpler to use a single scheme
1133 that works both with and without PIPELINING instead of having two separate sets
1136 The set of commands that are buffered up with pipelining may start with MAIL
1137 and may end with DATA; in between are RCPT commands that correspond to the
1138 addresses whose status is PENDING_DEFER. All other commands (STARTTLS, AUTH,
1139 etc.) are never buffered.
1141 Errors after MAIL or DATA abort the whole process leaving the response in the
1142 buffer. After MAIL, pending responses are flushed, and the original command is
1143 re-instated in big_buffer for error messages. For RCPT commands, the remote is
1144 permitted to reject some recipient addresses while accepting others. However
1145 certain errors clearly abort the whole process. Set the value in
1146 transport_return to PENDING_OK if the address is accepted. If there is a
1147 subsequent general error, it will get reset accordingly. If not, it will get
1148 converted to OK at the end.
1151 sx smtp connection context
1152 count the number of responses to read
1153 pending_DATA 0 if last command sent was not DATA
1154 +1 if previously had a good recipient
1155 -1 if not previously had a good recipient
1157 Returns: 3 if at least one address had 2xx and one had 5xx
1158 2 if at least one address had 5xx but none had 2xx
1159 1 if at least one host had a 2xx response, but none had 5xx
1160 0 no address had 2xx or 5xx but no errors (all 4xx, or just DATA)
1161 -1 timeout while reading RCPT response
1162 -2 I/O or other non-response error for RCPT
1163 -3 DATA or MAIL failed - errno and buffer set
1164 -4 banner or EHLO failed (early-pipelining)
1165 -5 banner or EHLO failed (early-pipelining, TLS)
1169 sync_responses(smtp_context * sx, int count, int pending_DATA)
1171 address_item * addr = sx->sync_addr;
1172 smtp_transport_options_block * ob = sx->conn_args.ob;
1175 #ifndef DISABLE_PIPE_CONNECT
1177 if ((rc = smtp_reap_early_pipe(sx, &count)) != OK)
1178 return rc == FAIL ? -4 : -5;
1181 /* Handle the response for a MAIL command. On error, reinstate the original
1182 command in big_buffer for error message use, and flush any further pending
1183 responses before returning, except after I/O errors and timeouts. */
1185 if (sx->pending_MAIL)
1187 DEBUG(D_transport) debug_printf("%s expect mail\n", __FUNCTION__);
1189 sx->pending_MAIL = sx->RCPT_452 = FALSE;
1190 if (!smtp_read_response(sx, sx->buffer, sizeof(sx->buffer),
1191 '2', ob->command_timeout))
1193 DEBUG(D_transport) debug_printf("bad response for MAIL\n");
1194 Ustrcpy(big_buffer, mail_command); /* Fits, because it came from there! */
1195 if (errno == ERRNO_TLSFAILURE)
1197 if (errno == 0 && sx->buffer[0] != 0)
1200 if (sx->buffer[0] == '4')
1202 save_errno = ERRNO_MAIL4XX;
1203 addr->more_errno |= ((sx->buffer[1] - '0')*10 + sx->buffer[2] - '0') << 8;
1205 count = smtp_discard_responses(sx, ob, count);
1209 if (pending_DATA) count--; /* Number of RCPT responses to come */
1210 while (count-- > 0) /* Mark any pending addrs with the host used */
1212 while (addr->transport_return != PENDING_DEFER) addr = addr->next;
1213 addr->host_used = sx->conn_args.host;
1220 if (pending_DATA) count--; /* Number of RCPT responses to come */
1222 /* Read and handle the required number of RCPT responses, matching each one up
1223 with an address by scanning for the next address whose status is PENDING_DEFER.
1228 while (addr->transport_return != PENDING_DEFER)
1229 if (!(addr = addr->next))
1232 /* The address was accepted */
1233 addr->host_used = sx->conn_args.host;
1235 DEBUG(D_transport) debug_printf("%s expect rcpt for %s\n", __FUNCTION__, addr->address);
1236 if (smtp_read_response(sx, sx->buffer, sizeof(sx->buffer),
1237 '2', ob->command_timeout))
1240 addr->transport_return = PENDING_OK;
1242 /* If af_dr_retry_exists is set, there was a routing delay on this address;
1243 ensure that any address-specific retry record is expunged. We do this both
1244 for the basic key and for the version that also includes the sender. */
1246 if (testflag(addr, af_dr_retry_exists))
1248 uschar *altkey = string_sprintf("%s:<%s>", addr->address_retry_key,
1250 retry_add_item(addr, altkey, rf_delete);
1251 retry_add_item(addr, addr->address_retry_key, rf_delete);
1255 /* Error on first TLS read */
1257 else if (errno == ERRNO_TLSFAILURE)
1260 /* Timeout while reading the response */
1262 else if (errno == ETIMEDOUT)
1264 uschar *message = string_sprintf("SMTP timeout after RCPT TO:<%s>",
1265 transport_rcpt_address(addr, sx->conn_args.tblock->rcpt_include_affixes));
1266 set_errno_nohost(sx->first_addr, ETIMEDOUT, message, DEFER, FALSE, &sx->delivery_start);
1267 retry_add_item(addr, addr->address_retry_key, 0);
1268 update_waiting = FALSE;
1272 /* Handle other errors in obtaining an SMTP response by returning -1. This
1273 will cause all the addresses to be deferred. Restore the SMTP command in
1274 big_buffer for which we are checking the response, so the error message
1277 else if (errno != 0 || sx->buffer[0] == 0)
1279 gstring gs = { .size = big_buffer_size, .ptr = 0, .s = big_buffer }, * g = &gs;
1281 /* Use taint-unchecked routines for writing into big_buffer, trusting
1282 that we'll never expand it. */
1284 g = string_fmt_append_f(g, SVFMT_TAINT_NOCHK, "RCPT TO:<%s>",
1285 transport_rcpt_address(addr, sx->conn_args.tblock->rcpt_include_affixes));
1286 string_from_gstring(g);
1290 /* Handle SMTP permanent and temporary response codes. */
1295 string_sprintf("SMTP error from remote mail server after RCPT TO:<%s>: "
1296 "%s", transport_rcpt_address(addr, sx->conn_args.tblock->rcpt_include_affixes),
1297 string_printing(sx->buffer));
1298 setflag(addr, af_pass_message);
1300 msglog_line(sx->conn_args.host, addr->message);
1302 /* The response was 5xx */
1304 if (sx->buffer[0] == '5')
1306 addr->transport_return = FAIL;
1310 /* The response was 4xx */
1314 addr->transport_return = DEFER;
1315 addr->basic_errno = ERRNO_RCPT4XX;
1316 addr->more_errno |= ((sx->buffer[1] - '0')*10 + sx->buffer[2] - '0') << 8;
1320 #ifndef DISABLE_EVENT
1321 event_defer_errno = addr->more_errno;
1322 msg_event_raise(US"msg:rcpt:host:defer", addr);
1324 /* If a 452 and we've had at least one 2xx or 5xx, set next_addr to the
1325 start point for another MAIL command. */
1327 if (addr->more_errno >> 8 == 52 && yield & 3)
1329 if (!sx->RCPT_452) /* initialised at MAIL-ack above */
1332 debug_printf("%s: seen first 452 too-many-rcpts\n", __FUNCTION__);
1333 sx->RCPT_452 = TRUE;
1334 sx->next_addr = addr;
1336 addr->transport_return = PENDING_DEFER;
1337 addr->basic_errno = 0;
1341 /* Log temporary errors if there are more hosts to be tried.
1342 If not, log this last one in the == line. */
1344 if (sx->conn_args.host->next)
1345 if (LOGGING(outgoing_port))
1346 log_write(0, LOG_MAIN, "H=%s [%s]:%d %s", sx->conn_args.host->name,
1347 sx->conn_args.host->address,
1348 sx->port == PORT_NONE ? 25 : sx->port, addr->message);
1350 log_write(0, LOG_MAIN, "H=%s [%s]: %s", sx->conn_args.host->name,
1351 sx->conn_args.host->address, addr->message);
1353 #ifndef DISABLE_EVENT
1355 msg_event_raise(US"msg:rcpt:defer", addr);
1358 /* Do not put this message on the list of those waiting for specific
1359 hosts, as otherwise it is likely to be tried too often. */
1361 update_waiting = FALSE;
1363 /* Add a retry item for the address so that it doesn't get tried again
1364 too soon. If address_retry_include_sender is true, add the sender address
1365 to the retry key. */
1367 retry_add_item(addr,
1368 ob->address_retry_include_sender
1369 ? string_sprintf("%s:<%s>", addr->address_retry_key, sender_address)
1370 : addr->address_retry_key,
1376 if (count && !(addr = addr->next))
1378 } /* Loop for next RCPT response */
1380 /* Update where to start at for the next block of responses, unless we
1381 have already handled all the addresses. */
1383 if (addr) sx->sync_addr = addr->next;
1385 /* Handle a response to DATA. If we have not had any good recipients, either
1386 previously or in this block, the response is ignored. */
1388 if (pending_DATA != 0)
1390 DEBUG(D_transport) debug_printf("%s expect data\n", __FUNCTION__);
1391 if (!smtp_read_response(sx, sx->buffer, sizeof(sx->buffer),
1392 '3', ob->command_timeout))
1398 if (errno == ERRNO_TLSFAILURE) /* Error on first TLS read */
1401 if (pending_DATA > 0 || (yield & 1) != 0)
1403 if (errno == 0 && sx->buffer[0] == '4')
1405 errno = ERRNO_DATA4XX;
1406 sx->first_addr->more_errno |= ((sx->buffer[1] - '0')*10 + sx->buffer[2] - '0') << 8;
1410 (void)check_response(sx->conn_args.host, &errno, 0, sx->buffer, &code, &msg, &pass_message);
1411 DEBUG(D_transport) debug_printf("%s\nerror for DATA ignored: pipelining "
1412 "is in use and there were no good recipients\n", msg);
1416 /* All responses read and handled; MAIL (if present) received 2xx and DATA (if
1417 present) received 3xx. If any RCPTs were handled and yielded anything other
1418 than 4xx, yield will be set non-zero. */
1427 /* Try an authenticator's client entry */
1430 try_authenticator(smtp_context * sx, auth_instance * au)
1432 smtp_transport_options_block * ob = sx->conn_args.ob; /* transport options */
1433 host_item * host = sx->conn_args.host; /* host to deliver to */
1436 /* Set up globals for error messages */
1438 authenticator_name = au->name;
1439 driver_srcfile = au->srcfile;
1440 driver_srcline = au->srcline;
1442 sx->outblock.authenticating = TRUE;
1443 rc = (au->info->clientcode)(au, sx, ob->command_timeout,
1444 sx->buffer, sizeof(sx->buffer));
1445 sx->outblock.authenticating = FALSE;
1446 driver_srcfile = authenticator_name = NULL; driver_srcline = 0;
1447 DEBUG(D_transport) debug_printf("%s authenticator yielded %d\n", au->name, rc);
1449 /* A temporary authentication failure must hold up delivery to
1450 this host. After a permanent authentication failure, we carry on
1451 to try other authentication methods. If all fail hard, try to
1452 deliver the message unauthenticated unless require_auth was set. */
1457 f.smtp_authenticated = TRUE; /* stops the outer loop */
1458 client_authenticator = au->name;
1459 if (au->set_client_id)
1460 client_authenticated_id = expand_string(au->set_client_id);
1463 /* Failure after writing a command */
1468 /* Failure after reading a response */
1471 if (errno != 0 || sx->buffer[0] != '5') return FAIL;
1472 log_write(0, LOG_MAIN, "%s authenticator failed H=%s [%s] %s",
1473 au->name, host->name, host->address, sx->buffer);
1476 /* Failure by some other means. In effect, the authenticator
1477 decided it wasn't prepared to handle this case. Typically this
1478 is the result of "fail" in an expansion string. Do we need to
1479 log anything here? Feb 2006: a message is now put in the buffer
1480 if logging is required. */
1483 if (*sx->buffer != 0)
1484 log_write(0, LOG_MAIN, "%s authenticator cancelled "
1485 "authentication H=%s [%s] %s", au->name, host->name,
1486 host->address, sx->buffer);
1489 /* Internal problem, message in buffer. */
1492 set_errno_nohost(sx->addrlist, ERRNO_AUTHPROB, string_copy(sx->buffer),
1493 DEFER, FALSE, &sx->delivery_start);
1502 /* Do the client side of smtp-level authentication.
1505 sx smtp connection context
1507 sx->buffer should have the EHLO response from server (gets overwritten)
1510 OK Success, or failed (but not required): global "smtp_authenticated" set
1511 DEFER Failed authentication (and was required)
1512 ERROR Internal problem
1514 FAIL_SEND Failed communications - transmit
1519 smtp_auth(smtp_context * sx)
1521 host_item * host = sx->conn_args.host; /* host to deliver to */
1522 smtp_transport_options_block * ob = sx->conn_args.ob; /* transport options */
1523 int require_auth = verify_check_given_host(CUSS &ob->hosts_require_auth, host);
1524 #ifndef DISABLE_PIPE_CONNECT
1525 unsigned short authbits = tls_out.active.sock >= 0
1526 ? sx->ehlo_resp.crypted_auths : sx->ehlo_resp.cleartext_auths;
1528 uschar * fail_reason = US"server did not advertise AUTH support";
1530 f.smtp_authenticated = FALSE;
1531 client_authenticator = client_authenticated_id = client_authenticated_sender = NULL;
1534 regex_AUTH = regex_must_compile(AUTHS_REGEX, FALSE, TRUE);
1536 /* Is the server offering AUTH? */
1540 #ifndef DISABLE_PIPE_CONNECT
1541 sx->early_pipe_active ? authbits
1544 regex_match_and_setup(regex_AUTH, sx->buffer, 0, -1)
1547 uschar * names = NULL;
1548 expand_nmax = -1; /* reset */
1550 #ifndef DISABLE_PIPE_CONNECT
1551 if (!sx->early_pipe_active)
1553 names = string_copyn(expand_nstring[1], expand_nlength[1]);
1555 /* Must not do this check until after we have saved the result of the
1556 regex match above as the check could be another RE. */
1558 if ( require_auth == OK
1559 || verify_check_given_host(CUSS &ob->hosts_try_auth, host) == OK)
1561 DEBUG(D_transport) debug_printf("scanning authentication mechanisms\n");
1562 fail_reason = US"no common mechanisms were found";
1564 #ifndef DISABLE_PIPE_CONNECT
1565 if (sx->early_pipe_active)
1567 /* Scan our authenticators (which support use by a client and were offered
1568 by the server (checked at cache-write time)), not suppressed by
1569 client_condition. If one is found, attempt to authenticate by calling its
1570 client function. We are limited to supporting up to 16 authenticator
1571 public-names by the number of bits in a short. */
1577 for (bitnum = 0, au = auths;
1578 !f.smtp_authenticated && au && bitnum < 16;
1579 bitnum++, au = au->next) if (authbits & BIT(bitnum))
1581 if ( au->client_condition
1582 && !expand_check_condition(au->client_condition, au->name,
1583 US"client authenticator"))
1585 DEBUG(D_transport) debug_printf("skipping %s authenticator: %s\n",
1586 au->name, "client_condition is false");
1590 /* Found data for a listed mechanism. Call its client entry. Set
1591 a flag in the outblock so that data is overwritten after sending so
1592 that reflections don't show it. */
1594 fail_reason = US"authentication attempt(s) failed";
1596 if ((rc = try_authenticator(sx, au)) != OK)
1603 /* Scan the configured authenticators looking for one which is configured
1604 for use as a client, which is not suppressed by client_condition, and
1605 whose name matches an authentication mechanism supported by the server.
1606 If one is found, attempt to authenticate by calling its client function.
1609 for (auth_instance * au = auths; !f.smtp_authenticated && au; au = au->next)
1614 || ( au->client_condition
1615 && !expand_check_condition(au->client_condition, au->name,
1616 US"client authenticator")))
1618 DEBUG(D_transport) debug_printf("skipping %s authenticator: %s\n",
1620 (au->client)? "client_condition is false" :
1621 "not configured as a client");
1625 /* Loop to scan supported server mechanisms */
1629 int len = Ustrlen(au->public_name);
1632 while (isspace(*p)) p++;
1634 if (strncmpic(au->public_name, p, len) != 0 ||
1635 (p[len] != 0 && !isspace(p[len])))
1637 while (*p != 0 && !isspace(*p)) p++;
1641 /* Found data for a listed mechanism. Call its client entry. Set
1642 a flag in the outblock so that data is overwritten after sending so
1643 that reflections don't show it. */
1645 fail_reason = US"authentication attempt(s) failed";
1647 if ((rc = try_authenticator(sx, au)) != OK)
1650 break; /* If not authenticated, try next authenticator */
1651 } /* Loop for scanning supported server mechanisms */
1652 } /* Loop for further authenticators */
1656 /* If we haven't authenticated, but are required to, give up. */
1658 if (require_auth == OK && !f.smtp_authenticated)
1660 #ifndef DISABLE_PIPE_CONNECT
1661 invalidate_ehlo_cache_entry(sx);
1663 set_errno_nohost(sx->addrlist, ERRNO_AUTHFAIL,
1664 string_sprintf("authentication required but %s", fail_reason), DEFER,
1665 FALSE, &sx->delivery_start);
1673 /* Construct AUTH appendix string for MAIL TO */
1676 sx context for smtp connection
1677 p point in sx->buffer to build string
1678 addrlist chain of potential addresses to deliver
1680 Globals f.smtp_authenticated
1681 client_authenticated_sender
1682 Return True on error, otherwise buffer has (possibly empty) terminated string
1686 smtp_mail_auth_str(smtp_context * sx, uschar * p, address_item * addrlist)
1688 smtp_transport_options_block * ob = sx->conn_args.ob;
1689 uschar * local_authenticated_sender = authenticated_sender;
1692 debug_printf("smtp_mail_auth_str: as<%s> os<%s> SA<%s>\n",
1693 authenticated_sender, ob->authenticated_sender, f.smtp_authenticated?"Y":"N");
1696 if (ob->authenticated_sender)
1698 uschar * new = expand_string(ob->authenticated_sender);
1701 if (!f.expand_string_forcedfail)
1703 uschar *message = string_sprintf("failed to expand "
1704 "authenticated_sender: %s", expand_string_message);
1705 set_errno_nohost(addrlist, ERRNO_EXPANDFAIL, message, DEFER, FALSE, &sx->delivery_start);
1710 local_authenticated_sender = new;
1713 /* Add the authenticated sender address if present */
1715 if ( (f.smtp_authenticated || ob->authenticated_sender_force)
1716 && local_authenticated_sender)
1718 string_format_nt(p, sizeof(sx->buffer) - (p-sx->buffer), " AUTH=%s",
1719 auth_xtextencode(local_authenticated_sender,
1720 Ustrlen(local_authenticated_sender)));
1721 client_authenticated_sender = string_copy(local_authenticated_sender);
1731 typedef struct smtp_compare_s
1733 uschar * current_sender_address;
1734 struct transport_instance * tblock;
1738 /* Create a unique string that identifies this message, it is based on
1739 sender_address, helo_data and tls_certificate if enabled.
1743 smtp_local_identity(uschar * sender, struct transport_instance * tblock)
1745 address_item * addr1;
1746 uschar * if1 = US"";
1747 uschar * helo1 = US"";
1749 uschar * tlsc1 = US"";
1751 uschar * save_sender_address = sender_address;
1752 uschar * local_identity = NULL;
1753 smtp_transport_options_block * ob = SOB tblock->options_block;
1755 sender_address = sender;
1757 addr1 = deliver_make_addr (sender, TRUE);
1758 deliver_set_expansions(addr1);
1761 if1 = expand_string(ob->interface);
1764 helo1 = expand_string(ob->helo_data);
1767 if (ob->tls_certificate)
1768 tlsc1 = expand_string(ob->tls_certificate);
1769 local_identity = string_sprintf ("%s^%s^%s", if1, helo1, tlsc1);
1771 local_identity = string_sprintf ("%s^%s", if1, helo1);
1774 deliver_set_expansions(NULL);
1775 sender_address = save_sender_address;
1777 return local_identity;
1782 /* This routine is a callback that is called from transport_check_waiting.
1783 This function will evaluate the incoming message versus the previous
1784 message. If the incoming message is using a different local identity then
1785 we will veto this new message. */
1788 smtp_are_same_identities(uschar * message_id, smtp_compare_t * s_compare)
1790 uschar * message_local_identity,
1791 * current_local_identity,
1792 * new_sender_address;
1794 current_local_identity =
1795 smtp_local_identity(s_compare->current_sender_address, s_compare->tblock);
1797 if (!(new_sender_address = spool_sender_from_msgid(message_id)))
1801 message_local_identity =
1802 smtp_local_identity(new_sender_address, s_compare->tblock);
1804 return Ustrcmp(current_local_identity, message_local_identity) == 0;
1810 ehlo_response(uschar * buf, unsigned checks)
1812 PCRE2_SIZE bsize = Ustrlen(buf);
1813 pcre2_match_data * md = pcre2_match_data_create(1, pcre_gen_ctx);
1815 /* debug_printf("%s: check for 0x%04x\n", __FUNCTION__, checks); */
1818 if ( checks & OPTION_TLS
1819 && pcre2_match(regex_STARTTLS,
1820 (PCRE2_SPTR)buf, bsize, 0, PCRE_EOPT, md, pcre_mtc_ctx) < 0)
1822 checks &= ~OPTION_TLS;
1824 if ( checks & OPTION_IGNQ
1825 && pcre2_match(regex_IGNOREQUOTA,
1826 (PCRE2_SPTR)buf, bsize, 0, PCRE_EOPT, md, pcre_mtc_ctx) < 0)
1827 checks &= ~OPTION_IGNQ;
1829 if ( checks & OPTION_CHUNKING
1830 && pcre2_match(regex_CHUNKING,
1831 (PCRE2_SPTR)buf, bsize, 0, PCRE_EOPT, md, pcre_mtc_ctx) < 0)
1832 checks &= ~OPTION_CHUNKING;
1834 #ifndef DISABLE_PRDR
1835 if ( checks & OPTION_PRDR
1836 && pcre2_match(regex_PRDR,
1837 (PCRE2_SPTR)buf, bsize, 0, PCRE_EOPT, md, pcre_mtc_ctx) < 0)
1839 checks &= ~OPTION_PRDR;
1842 if ( checks & OPTION_UTF8
1843 && pcre2_match(regex_UTF8,
1844 (PCRE2_SPTR)buf, bsize, 0, PCRE_EOPT, md, pcre_mtc_ctx) < 0)
1846 checks &= ~OPTION_UTF8;
1848 if ( checks & OPTION_DSN
1849 && pcre2_match(regex_DSN,
1850 (PCRE2_SPTR)buf, bsize, 0, PCRE_EOPT, md, pcre_mtc_ctx) < 0)
1851 checks &= ~OPTION_DSN;
1853 if ( checks & OPTION_PIPE
1854 && pcre2_match(regex_PIPELINING,
1855 (PCRE2_SPTR)buf, bsize, 0, PCRE_EOPT, md, pcre_mtc_ctx) < 0)
1856 checks &= ~OPTION_PIPE;
1858 if ( checks & OPTION_SIZE
1859 && pcre2_match(regex_SIZE,
1860 (PCRE2_SPTR)buf, bsize, 0, PCRE_EOPT, md, pcre_mtc_ctx) < 0)
1861 checks &= ~OPTION_SIZE;
1863 #ifndef DISABLE_PIPE_CONNECT
1864 if ( checks & OPTION_EARLY_PIPE
1865 && pcre2_match(regex_EARLY_PIPE,
1866 (PCRE2_SPTR)buf, bsize, 0, PCRE_EOPT, md, pcre_mtc_ctx) < 0)
1868 checks &= ~OPTION_EARLY_PIPE;
1870 pcre2_match_data_free(md);
1871 /* debug_printf("%s: found 0x%04x\n", __FUNCTION__, checks); */
1877 /* Callback for emitting a BDAT data chunk header.
1879 If given a nonzero size, first flush any buffered SMTP commands
1880 then emit the command.
1882 Reap previous SMTP command responses if requested, and always reap
1883 the response from a previous BDAT command.
1886 tctx transport context
1887 chunk_size value for SMTP BDAT command
1889 tc_chunk_last add LAST option to SMTP BDAT command
1890 tc_reap_prev reap response to previous SMTP commands
1894 DEFER TLS error on first read (EHLO-resp); errno set
1898 smtp_chunk_cmd_callback(transport_ctx * tctx, unsigned chunk_size,
1901 smtp_transport_options_block * ob = SOB tctx->tblock->options_block;
1902 smtp_context * sx = tctx->smtp_context;
1906 /* Write SMTP chunk header command. If not reaping responses, note that
1907 there may be more writes (like, the chunk data) done soon. */
1911 #ifndef DISABLE_PIPE_CONNECT
1912 BOOL new_conn = !!(sx->outblock.conn_args);
1914 if((cmd_count = smtp_write_command(sx,
1915 flags & tc_reap_prev ? SCMD_FLUSH : SCMD_MORE,
1916 "BDAT %u%s\r\n", chunk_size, flags & tc_chunk_last ? " LAST" : "")
1917 ) < 0) return ERROR;
1918 if (flags & tc_chunk_last)
1919 data_command = string_copy(big_buffer); /* Save for later error message */
1920 #ifndef DISABLE_PIPE_CONNECT
1921 /* That command write could have been the one that made the connection.
1922 Copy the fd from the client conn ctx (smtp transport specific) to the
1923 generic transport ctx. */
1926 tctx->u.fd = sx->outblock.cctx->sock;
1930 prev_cmd_count = cmd_count += sx->cmd_count;
1932 /* Reap responses for any previous, but not one we just emitted */
1936 if (sx->pending_BDAT)
1939 if (flags & tc_reap_prev && prev_cmd_count > 0)
1941 DEBUG(D_transport) debug_printf("look for %d responses"
1942 " for previous pipelined cmds\n", prev_cmd_count);
1944 switch(sync_responses(sx, prev_cmd_count, 0))
1946 case 1: /* 2xx (only) => OK */
1947 case 3: sx->good_RCPT = TRUE; /* 2xx & 5xx => OK & progress made */
1948 case 2: sx->completed_addr = TRUE; /* 5xx (only) => progress made */
1949 case 0: break; /* No 2xx or 5xx, but no probs */
1951 case -5: errno = ERRNO_TLSFAILURE;
1953 #ifndef DISABLE_PIPE_CONNECT
1954 case -4: /* non-2xx for pipelined banner or EHLO */
1956 case -1: /* Timeout on RCPT */
1957 default: return ERROR; /* I/O error, or any MAIL/DATA error */
1960 if (!sx->pending_BDAT)
1961 pipelining_active = FALSE;
1964 /* Reap response for an outstanding BDAT */
1966 if (sx->pending_BDAT)
1968 DEBUG(D_transport) debug_printf("look for one response for BDAT\n");
1970 if (!smtp_read_response(sx, sx->buffer, sizeof(sx->buffer), '2',
1971 ob->command_timeout))
1973 if (errno == 0 && sx->buffer[0] == '4')
1975 errno = ERRNO_DATA4XX; /*XXX does this actually get used? */
1976 sx->addrlist->more_errno |=
1977 ((sx->buffer[1] - '0')*10 + sx->buffer[2] - '0') << 8;
1982 sx->pending_BDAT = FALSE;
1983 pipelining_active = FALSE;
1985 else if (chunk_size > 0)
1986 sx->pending_BDAT = TRUE;
1989 sx->cmd_count = cmd_count;
1997 check_force_dane_conn(smtp_context * sx, smtp_transport_options_block * ob)
2000 if( sx->dane_required
2001 || verify_check_given_host(CUSS &ob->hosts_try_dane, sx->conn_args.host) == OK
2003 switch (rc = tlsa_lookup(sx->conn_args.host, &sx->conn_args.tlsa_dnsa, sx->dane_required))
2005 case OK: sx->conn_args.dane = TRUE;
2006 ob->tls_tempfail_tryclear = FALSE; /* force TLS */
2007 ob->tls_sni = sx->conn_args.host->name; /* force SNI */
2009 case FAIL_FORCED: break;
2010 default: set_errno_nohost(sx->addrlist, ERRNO_DNSDEFER,
2011 string_sprintf("DANE error: tlsa lookup %s",
2013 rc, FALSE, &sx->delivery_start);
2014 # ifndef DISABLE_EVENT
2015 (void) event_raise(sx->conn_args.tblock->event_action,
2016 US"dane:fail", sx->dane_required
2017 ? US"dane-required" : US"dnssec-invalid",
2027 /*************************************************
2028 * Make connection for given message *
2029 *************************************************/
2033 sx connection context
2034 suppress_tls if TRUE, don't attempt a TLS connection - this is set for
2035 a second attempt after TLS initialization fails
2037 Returns: OK - the connection was made and the delivery attempted;
2038 fd is set in the conn context, tls_out set up.
2039 DEFER - the connection could not be made, or something failed
2040 while setting up the SMTP session, or there was a
2041 non-message-specific error, such as a timeout.
2042 ERROR - helo_data or add_headers or authenticated_sender is
2043 specified for this transport, and the string failed
2047 smtp_setup_conn(smtp_context * sx, BOOL suppress_tls)
2049 smtp_transport_options_block * ob = sx->conn_args.tblock->options_block;
2050 BOOL pass_message = FALSE;
2051 uschar * message = NULL;
2054 uschar * tls_errstr;
2057 /* Many lines of clearing individual elements of *sx that used to
2058 be here have been replaced by a full memset to zero (de41aff051).
2059 There are two callers, this file and verify.c . Now we only set
2060 up nonzero elements. */
2062 sx->conn_args.ob = ob;
2064 sx->lmtp = strcmpic(ob->protocol, US"lmtp") == 0;
2065 sx->smtps = strcmpic(ob->protocol, US"smtps") == 0;
2066 sx->send_rset = TRUE;
2067 sx->send_quit = TRUE;
2068 sx->setting_up = TRUE;
2070 sx->dsn_all_lasthop = TRUE;
2073 verify_check_given_host(CUSS &ob->hosts_require_dane, sx->conn_args.host) == OK;
2076 if ((sx->max_mail = sx->conn_args.tblock->connection_max_messages) == 0) sx->max_mail = 999999;
2077 if ((sx->max_rcpt = sx->conn_args.tblock->max_addresses) == 0) sx->max_rcpt = 999999;
2078 sx->igquotstr = US"";
2079 if (!sx->helo_data) sx->helo_data = ob->helo_data;
2081 smtp_command = US"initial connection";
2083 /* Set up the buffer for reading SMTP response packets. */
2085 sx->inblock.buffer = sx->inbuffer;
2086 sx->inblock.buffersize = sizeof(sx->inbuffer);
2087 sx->inblock.ptr = sx->inbuffer;
2088 sx->inblock.ptrend = sx->inbuffer;
2090 /* Set up the buffer for holding SMTP commands while pipelining */
2092 sx->outblock.buffer = sx->outbuffer;
2093 sx->outblock.buffersize = sizeof(sx->outbuffer);
2094 sx->outblock.ptr = sx->outbuffer;
2096 /* Reset the parameters of a TLS session. */
2099 tls_out.cipher = NULL; /* the one we may use for this transport */
2100 tls_out.ourcert = NULL;
2101 tls_out.peercert = NULL;
2102 tls_out.peerdn = NULL;
2106 tls_out.ocsp = OCSP_NOT_REQ;
2107 #ifndef DISABLE_TLS_RESUME
2108 tls_out.resumption = 0;
2112 /* Flip the legacy TLS-related variables over to the outbound set in case
2113 they're used in the context of the transport. Don't bother resetting
2114 afterward (when being used by a transport) as we're in a subprocess.
2115 For verify, unflipped once the callout is dealt with */
2117 tls_modify_variables(&tls_out);
2122 set_errno_nohost(sx->addrlist, ERRNO_TLSFAILURE, US"TLS support not available",
2123 DEFER, FALSE, &sx->delivery_start);
2128 /* If we have a proxied TLS connection, check usability for this message */
2130 if (continue_hostname && continue_proxy_cipher)
2133 const uschar * sni = US"";
2135 # ifdef SUPPORT_DANE
2136 /* Check if the message will be DANE-verified; if so force TLS and its SNI */
2138 tls_out.dane_verified = FALSE;
2139 smtp_port_for_connect(sx->conn_args.host, sx->port);
2140 if ( sx->conn_args.host->dnssec == DS_YES
2141 && (rc = check_force_dane_conn(sx, ob)) != OK
2146 /* If the SNI or the DANE status required for the new message differs from the
2147 existing conn drop the connection to force a new one. */
2149 if (ob->tls_sni && !(sni = expand_cstring(ob->tls_sni)))
2150 log_write(0, LOG_MAIN|LOG_PANIC,
2151 "<%s>: failed to expand transport's tls_sni value: %s",
2152 sx->addrlist->address, expand_string_message);
2154 # ifdef SUPPORT_DANE
2155 if ( (continue_proxy_sni ? (Ustrcmp(continue_proxy_sni, sni) == 0) : !*sni)
2156 && continue_proxy_dane == sx->conn_args.dane)
2158 tls_out.sni = US sni;
2159 if ((tls_out.dane_verified = continue_proxy_dane))
2160 sx->conn_args.host->dnssec = DS_YES;
2163 if ((continue_proxy_sni ? (Ustrcmp(continue_proxy_sni, sni) == 0) : !*sni))
2164 tls_out.sni = US sni;
2169 debug_printf("Closing proxied-TLS connection due to SNI mismatch\n");
2171 smtp_debug_cmd(US"QUIT", 0);
2172 write(0, "QUIT\r\n", 6);
2174 continue_hostname = continue_proxy_cipher = NULL;
2175 f.continue_more = FALSE;
2176 continue_sequence = 1; /* Unfortunately, this process cannot affect success log
2177 which is done by delivery proc. Would have to pass this
2178 back through reporting pipe. */
2181 #endif /*!DISABLE_TLS*/
2183 /* Make a connection to the host if this isn't a continued delivery, and handle
2184 the initial interaction and HELO/EHLO/LHLO. Connect timeout errors are handled
2185 specially so they can be identified for retries. */
2187 if (!continue_hostname)
2190 HDEBUG(D_verify) debug_printf("interface=%s port=%d\n", sx->conn_args.interface, sx->port);
2192 /* Arrange to report to calling process this is a new connection */
2194 clearflag(sx->first_addr, af_cont_conn);
2195 setflag(sx->first_addr, af_new_conn);
2197 /* Get the actual port the connection will use, into sx->conn_args.host */
2199 smtp_port_for_connect(sx->conn_args.host, sx->port);
2202 /* Do TLSA lookup for DANE */
2204 tls_out.dane_verified = FALSE;
2205 tls_out.tlsa_usage = 0;
2207 if (sx->conn_args.host->dnssec == DS_YES)
2210 if ((rc = check_force_dane_conn(sx, ob)) != OK)
2213 else if (sx->dane_required)
2215 set_errno_nohost(sx->addrlist, ERRNO_DNSDEFER,
2216 string_sprintf("DANE error: %s lookup not DNSSEC", sx->conn_args.host->name),
2217 FAIL, FALSE, &sx->delivery_start);
2218 # ifndef DISABLE_EVENT
2219 (void) event_raise(sx->conn_args.tblock->event_action,
2220 US"dane:fail", US"dane-required", NULL);
2227 /* Make the TCP connection */
2229 sx->cctx.tls_ctx = NULL;
2230 sx->inblock.cctx = sx->outblock.cctx = &sx->cctx;
2231 #ifdef EXPERIMENTAL_ESMTP_LIMITS
2232 sx->peer_limit_mail = sx->peer_limit_rcpt = sx->peer_limit_rcptdom =
2234 sx->avoid_option = sx->peer_offered = smtp_peer_options = 0;
2235 #ifndef DISABLE_CLIENT_CMD_LOG
2236 client_cmd_log = NULL;
2239 #ifndef DISABLE_PIPE_CONNECT
2240 if ( verify_check_given_host(CUSS &ob->hosts_pipe_connect,
2241 sx->conn_args.host) == OK)
2243 /* We don't find out the local ip address until the connect, so if
2244 the helo string might use it avoid doing early-pipelining. */
2247 || sx->conn_args.interface
2248 || !Ustrstr(sx->helo_data, "$sending_ip_address")
2249 || Ustrstr(sx->helo_data, "def:sending_ip_address")
2252 sx->early_pipe_ok = TRUE;
2253 if ( read_ehlo_cache_entry(sx)
2254 && sx->ehlo_resp.cleartext_features & OPTION_EARLY_PIPE)
2257 debug_printf("Using cached cleartext PIPECONNECT\n");
2258 sx->early_pipe_active = TRUE;
2259 sx->peer_offered = sx->ehlo_resp.cleartext_features;
2262 else DEBUG(D_transport)
2263 debug_printf("helo needs $sending_ip_address; avoid early-pipelining\n");
2266 if (sx->early_pipe_active)
2268 sx->outblock.conn_args = &sx->conn_args;
2269 (void) smtp_boundsock(&sx->conn_args);
2274 blob lazy_conn = {.data = NULL};
2275 /* For TLS-connect, a TFO lazy-connect is useful since the Client Hello
2276 can go on the TCP SYN. */
2278 if ((sx->cctx.sock = smtp_connect(&sx->conn_args,
2279 sx->smtps ? &lazy_conn : NULL)) < 0)
2281 set_errno_nohost(sx->addrlist,
2282 errno == ETIMEDOUT ? ERRNO_CONNECTTIMEOUT : errno,
2283 sx->verify ? US strerror(errno) : NULL,
2284 DEFER, FALSE, &sx->delivery_start);
2285 sx->send_quit = FALSE;
2289 (void) setsockopt(sx->cctx.sock, IPPROTO_TCP, TCP_QUICKACK, US &off,
2293 /* Expand the greeting message while waiting for the initial response. (Makes
2294 sense if helo_data contains ${lookup dnsdb ...} stuff). The expansion is
2295 delayed till here so that $sending_ip_address and $sending_port are set.
2296 Those will be known even for a TFO lazy-connect, having been set by the bind().
2297 For early-pipe, we are ok if binding to a local interface; otherwise (if
2298 $sending_ip_address is seen in helo_data) we disabled early-pipe above. */
2301 if (!(sx->helo_data = expand_string(sx->helo_data)))
2303 log_write(0, LOG_MAIN|LOG_PANIC,
2304 "<%s>: failed to expand transport's helo_data value for callout: %s",
2305 sx->addrlist->address, expand_string_message);
2310 expand_string_message = NULL;
2311 if ((sx->helo_data = string_domain_utf8_to_alabel(sx->helo_data,
2312 &expand_string_message)),
2313 expand_string_message)
2315 log_write(0, LOG_MAIN|LOG_PANIC,
2316 "<%s>: failed to expand transport's helo_data value for callout: %s",
2317 sx->addrlist->address, expand_string_message);
2319 sx->helo_data = NULL;
2323 /* The first thing is to wait for an initial OK response. The dreaded "goto"
2324 is nevertheless a reasonably clean way of programming this kind of logic,
2325 where you want to escape on any error. */
2329 #ifndef DISABLE_PIPE_CONNECT
2330 if (sx->early_pipe_active)
2332 sx->pending_BANNER = TRUE; /* sync_responses() must eventually handle */
2333 sx->outblock.cmd_count = 1;
2338 if (!smtp_reap_banner(sx))
2339 goto RESPONSE_FAILED;
2342 #ifndef DISABLE_EVENT
2345 lookup_dnssec_authenticated = sx->conn_args.host->dnssec==DS_YES ? US"yes"
2346 : sx->conn_args.host->dnssec==DS_NO ? US"no" : NULL;
2347 s = event_raise(sx->conn_args.tblock->event_action, US"smtp:connect", sx->buffer, NULL);
2350 set_errno_nohost(sx->addrlist, ERRNO_EXPANDFAIL,
2351 string_sprintf("deferred by smtp:connect event expansion: %s", s),
2352 DEFER, FALSE, &sx->delivery_start);
2359 /* Now check if the helo_data expansion went well, and sign off cleanly if
2364 message = string_sprintf("failed to expand helo_data: %s",
2365 expand_string_message);
2366 set_errno_nohost(sx->addrlist, ERRNO_EXPANDFAIL, message, DEFER, FALSE, &sx->delivery_start);
2372 /** Debugging without sending a message
2373 sx->addrlist->transport_return = DEFER;
2377 /* Errors that occur after this point follow an SMTP command, which is
2378 left in big_buffer by smtp_write_command() for use in error messages. */
2380 smtp_command = big_buffer;
2382 /* Tell the remote who we are...
2384 February 1998: A convention has evolved that ESMTP-speaking MTAs include the
2385 string "ESMTP" in their greeting lines, so make Exim send EHLO if the
2386 greeting is of this form. The assumption was that the far end supports it
2387 properly... but experience shows that there are some that give 5xx responses,
2388 even though the banner includes "ESMTP" (there's a bloody-minded one that
2389 says "ESMTP not spoken here"). Cope with that case.
2391 September 2000: Time has passed, and it seems reasonable now to always send
2392 EHLO at the start. It is also convenient to make the change while installing
2395 July 2003: Joachim Wieland met a broken server that advertises "PIPELINING"
2396 but times out after sending MAIL FROM, RCPT TO and DATA all together. There
2397 would be no way to send out the mails, so there is now a host list
2398 "hosts_avoid_esmtp" that disables ESMTP for special hosts and solves the
2399 PIPELINING problem as well. Maybe it can also be useful to cure other
2400 problems with broken servers.
2402 Exim originally sent "Helo" at this point and ran for nearly a year that way.
2403 Then somebody tried it with a Microsoft mailer... It seems that all other
2404 mailers use upper case for some reason (the RFC is quite clear about case
2405 independence) so, for peace of mind, I gave in. */
2407 sx->esmtp = verify_check_given_host(CUSS &ob->hosts_avoid_esmtp, sx->conn_args.host) != OK;
2409 /* Alas; be careful, since this goto is not an error-out, so conceivably
2410 we might set data between here and the target which we assume to exist
2411 and be usable. I can see this coming back to bite us. */
2415 smtp_peer_options |= OPTION_TLS;
2416 suppress_tls = FALSE;
2417 ob->tls_tempfail_tryclear = FALSE;
2418 smtp_command = US"SSL-on-connect";
2425 if (smtp_write_command(sx,
2426 #ifndef DISABLE_PIPE_CONNECT
2427 sx->early_pipe_active ? SCMD_BUFFER :
2430 "%s %s\r\n", sx->lmtp ? "LHLO" : "EHLO", sx->helo_data) < 0)
2432 sx->esmtp_sent = TRUE;
2434 #ifndef DISABLE_PIPE_CONNECT
2435 if (sx->early_pipe_active)
2437 sx->pending_EHLO = TRUE;
2439 /* If we have too many authenticators to handle and might need to AUTH
2440 for this transport, pipeline no further as we will need the
2441 list of auth methods offered. Reap the banner and EHLO. */
2443 if ( (ob->hosts_require_auth || ob->hosts_try_auth)
2444 && f.smtp_in_early_pipe_no_auth)
2446 DEBUG(D_transport) debug_printf("may need to auth, so pipeline no further\n");
2447 if (smtp_write_command(sx, SCMD_FLUSH, NULL) < 0)
2449 if (sync_responses(sx, 2, 0) != 0)
2452 debug_printf("failed reaping pipelined cmd responses\n");
2453 goto RESPONSE_FAILED;
2455 sx->early_pipe_active = FALSE;
2460 if (!smtp_reap_ehlo(sx))
2461 goto RESPONSE_FAILED;
2465 debug_printf("not sending EHLO (host matches hosts_avoid_esmtp)\n");
2467 #ifndef DISABLE_PIPE_CONNECT
2468 if (!sx->early_pipe_active)
2473 int n = sizeof(sx->buffer);
2474 uschar * rsp = sx->buffer;
2476 if (sx->esmtp_sent && (n = Ustrlen(sx->buffer) + 1) < sizeof(sx->buffer)/2)
2477 { rsp = sx->buffer + n; n = sizeof(sx->buffer) - n; }
2479 if (smtp_write_command(sx, SCMD_FLUSH, "HELO %s\r\n", sx->helo_data) < 0)
2481 good_response = smtp_read_response(sx, rsp, n, '2', ob->command_timeout);
2482 #ifdef EXPERIMENTAL_DSN_INFO
2483 sx->helo_response = string_copy(rsp);
2487 /* Handle special logging for a closed connection after HELO
2488 when had previously sent EHLO */
2490 if (rsp != sx->buffer && rsp[0] == 0 && (errno == 0 || errno == ECONNRESET))
2492 errno = ERRNO_SMTPCLOSED;
2493 goto EHLOHELO_FAILED;
2495 memmove(sx->buffer, rsp, Ustrlen(rsp));
2496 goto RESPONSE_FAILED;
2500 if (sx->esmtp || sx->lmtp)
2502 #ifndef DISABLE_PIPE_CONNECT
2503 if (!sx->early_pipe_active)
2506 sx->peer_offered = ehlo_response(sx->buffer,
2507 OPTION_TLS /* others checked later */
2508 #ifndef DISABLE_PIPE_CONNECT
2509 | (sx->early_pipe_ok
2511 | OPTION_CHUNKING | OPTION_PRDR | OPTION_DSN | OPTION_PIPE | OPTION_SIZE
2520 #ifdef EXPERIMENTAL_ESMTP_LIMITS
2521 if (tls_out.active.sock >= 0 || !(sx->peer_offered & OPTION_TLS))
2523 ehlo_response_limits_read(sx);
2524 ehlo_response_limits_apply(sx);
2527 #ifndef DISABLE_PIPE_CONNECT
2528 if (sx->early_pipe_ok)
2530 sx->ehlo_resp.cleartext_features = sx->peer_offered;
2532 if ( (sx->peer_offered & (OPTION_PIPE | OPTION_EARLY_PIPE))
2533 == (OPTION_PIPE | OPTION_EARLY_PIPE))
2535 DEBUG(D_transport) debug_printf("PIPE_CONNECT usable in future for this IP\n");
2536 sx->ehlo_resp.cleartext_auths = study_ehlo_auths(sx);
2537 write_ehlo_cache_entry(sx);
2543 /* Set tls_offered if the response to EHLO specifies support for STARTTLS. */
2546 smtp_peer_options |= sx->peer_offered & OPTION_TLS;
2551 /* For continuing deliveries down the same channel, having re-exec'd the socket
2552 is the standard input; for a socket held open from verify it is recorded
2553 in the cutthrough context block. Either way we don't need to redo EHLO here
2554 (but may need to do so for TLS - see below).
2555 Set up the pointer to where subsequent commands will be left, for
2556 error messages. Note that smtp_peer_options will have been
2557 set from the command line if they were set in the process that passed the
2560 /*XXX continue case needs to propagate DSN_INFO, prob. in deliver.c
2561 as the continue goes via transport_pass_socket() and doublefork and exec.
2562 It does not wait. Unclear how we keep separate host's responses
2563 separate - we could match up by host ip+port as a bodge. */
2567 if (cutthrough.cctx.sock >= 0 && cutthrough.callout_hold_only)
2569 sx->cctx = cutthrough.cctx;
2570 sx->conn_args.host->port = sx->port = cutthrough.host.port;
2574 sx->cctx.sock = 0; /* stdin */
2575 sx->cctx.tls_ctx = NULL;
2576 smtp_port_for_connect(sx->conn_args.host, sx->port); /* Record the port that was used */
2578 sx->inblock.cctx = sx->outblock.cctx = &sx->cctx;
2579 smtp_command = big_buffer;
2580 sx->peer_offered = smtp_peer_options;
2581 #ifdef EXPERIMENTAL_ESMTP_LIMITS
2582 /* Limits passed by cmdline over exec. */
2583 ehlo_limits_apply(sx,
2584 sx->peer_limit_mail = continue_limit_mail,
2585 sx->peer_limit_rcpt = continue_limit_rcpt,
2586 sx->peer_limit_rcptdom = continue_limit_rcptdom);
2588 sx->helo_data = NULL; /* ensure we re-expand ob->helo_data */
2590 /* For a continued connection with TLS being proxied for us, or a
2591 held-open verify connection with TLS, nothing more to do. */
2593 if ( continue_proxy_cipher
2594 || (cutthrough.cctx.sock >= 0 && cutthrough.callout_hold_only
2595 && cutthrough.is_tls)
2598 sx->pipelining_used = pipelining_active = !!(smtp_peer_options & OPTION_PIPE);
2599 HDEBUG(D_transport) debug_printf("continued connection, %s TLS\n",
2600 continue_proxy_cipher ? "proxied" : "verify conn with");
2603 HDEBUG(D_transport) debug_printf("continued connection, no TLS\n");
2606 /* If TLS is available on this connection, whether continued or not, attempt to
2607 start up a TLS session, unless the host is in hosts_avoid_tls. If successful,
2608 send another EHLO - the server may give a different answer in secure mode. We
2609 use a separate buffer for reading the response to STARTTLS so that if it is
2610 negative, the original EHLO data is available for subsequent analysis, should
2611 the client not be required to use TLS. If the response is bad, copy the buffer
2612 for error analysis. */
2615 if ( smtp_peer_options & OPTION_TLS
2617 && verify_check_given_host(CUSS &ob->hosts_avoid_tls, sx->conn_args.host) != OK
2619 || verify_check_given_host(CUSS &ob->hosts_verify_avoid_tls, sx->conn_args.host) != OK
2622 uschar buffer2[4096];
2624 if (smtp_write_command(sx, SCMD_FLUSH, "STARTTLS\r\n") < 0)
2627 #ifndef DISABLE_PIPE_CONNECT
2628 /* If doing early-pipelining reap the banner and EHLO-response but leave
2629 the response for the STARTTLS we just sent alone. On fail, assume wrong
2630 cached capability and retry with the pipelining disabled. */
2632 if (sx->early_pipe_active && sync_responses(sx, 2, 0) != 0)
2635 debug_printf("failed reaping pipelined cmd responses\n");
2636 close(sx->cctx.sock);
2638 sx->early_pipe_active = FALSE;
2639 goto PIPE_CONNECT_RETRY;
2643 /* If there is an I/O error, transmission of this message is deferred. If
2644 there is a temporary rejection of STARRTLS and tls_tempfail_tryclear is
2645 false, we also defer. However, if there is a temporary rejection of STARTTLS
2646 and tls_tempfail_tryclear is true, or if there is an outright rejection of
2647 STARTTLS, we carry on. This means we will try to send the message in clear,
2648 unless the host is in hosts_require_tls (tested below). */
2650 if (!smtp_read_response(sx, buffer2, sizeof(buffer2), '2', ob->command_timeout))
2654 || (buffer2[0] == '4' && !ob->tls_tempfail_tryclear)
2657 Ustrncpy(sx->buffer, buffer2, sizeof(sx->buffer));
2658 sx->buffer[sizeof(sx->buffer)-1] = '\0';
2659 goto RESPONSE_FAILED;
2663 /* STARTTLS accepted: try to negotiate a TLS session. */
2668 if (!tls_client_start(&sx->cctx, &sx->conn_args, sx->addrlist, &tls_out, &tls_errstr))
2670 /* TLS negotiation failed; give an error. From outside, this function may
2671 be called again to try in clear on a new connection, if the options permit
2672 it for this host. */
2674 DEBUG(D_tls) debug_printf("TLS session fail: %s\n", tls_errstr);
2676 # ifdef SUPPORT_DANE
2677 if (sx->conn_args.dane)
2679 log_write(0, LOG_MAIN,
2680 "DANE attempt failed; TLS connection to %s [%s]: %s",
2681 sx->conn_args.host->name, sx->conn_args.host->address, tls_errstr);
2682 # ifndef DISABLE_EVENT
2683 (void) event_raise(sx->conn_args.tblock->event_action,
2684 US"dane:fail", US"validation-failure", NULL); /* could do with better detail */
2689 errno = ERRNO_TLSFAILURE;
2690 message = string_sprintf("TLS session: %s", tls_errstr);
2691 sx->send_quit = FALSE;
2694 sx->send_tlsclose = TRUE;
2696 /* TLS session is set up. Check the inblock fill level. If there is
2697 content then as we have not yet done a tls read it must have arrived before
2698 the TLS handshake, in-clear. That violates the sync requirement of the
2699 STARTTLS RFC, so fail. */
2701 if (sx->inblock.ptr != sx->inblock.ptrend)
2705 int i = sx->inblock.ptrend - sx->inblock.ptr;
2706 debug_printf("unused data in input buffer after ack for STARTTLS:\n"
2708 i > 100 ? 100 : i, sx->inblock.ptr, i > 100 ? "..." : "");
2710 tls_errstr = US"synch error before connect";
2711 goto TLS_CONN_FAILED;
2714 smtp_peer_options_wrap = smtp_peer_options;
2715 for (address_item * addr = sx->addrlist; addr; addr = addr->next)
2716 if (addr->transport_return == PENDING_DEFER)
2718 addr->cipher = tls_out.cipher;
2719 addr->ourcert = tls_out.ourcert;
2720 addr->peercert = tls_out.peercert;
2721 addr->peerdn = tls_out.peerdn;
2722 addr->ocsp = tls_out.ocsp;
2723 addr->tlsver = tls_out.ver;
2728 /* if smtps, we'll have smtp_command set to something else; always safe to
2730 smtp_command = big_buffer;
2732 /* If we started TLS, redo the EHLO/LHLO exchange over the secure channel. If
2733 helo_data is null, we are dealing with a connection that was passed from
2734 another process, and so we won't have expanded helo_data above. We have to
2735 expand it here. $sending_ip_address and $sending_port are set up right at the
2736 start of the Exim process (in exim.c). */
2738 if (tls_out.active.sock >= 0)
2740 uschar * greeting_cmd;
2742 if (!sx->helo_data && !(sx->helo_data = expand_string(ob->helo_data)))
2744 uschar *message = string_sprintf("failed to expand helo_data: %s",
2745 expand_string_message);
2746 set_errno_nohost(sx->addrlist, ERRNO_EXPANDFAIL, message, DEFER, FALSE, &sx->delivery_start);
2751 #ifndef DISABLE_PIPE_CONNECT
2752 /* For SMTPS there is no cleartext early-pipe; use the crypted permission bit.
2753 We're unlikely to get the group sent and delivered before the server sends its
2754 banner, but it's still worth sending as a group.
2755 For STARTTLS allow for cleartext early-pipe but no crypted early-pipe, but not
2758 if (sx->smtps ? sx->early_pipe_ok : sx->early_pipe_active)
2760 sx->peer_offered = sx->ehlo_resp.crypted_features;
2761 if ((sx->early_pipe_active =
2762 !!(sx->ehlo_resp.crypted_features & OPTION_EARLY_PIPE)))
2763 DEBUG(D_transport) debug_printf("Using cached crypted PIPECONNECT\n");
2766 #ifdef EXPERIMMENTAL_ESMTP_LIMITS
2767 /* As we are about to send another EHLO, forget any LIMITS received so far. */
2768 sx->peer_limit_mail = sx->peer_limit_rcpt = sx->peer_limit_rcptdom = 0;
2769 if ((sx->max_mail = sx->conn_args.tblock->connection_max_message) == 0) sx->max_mail = 999999;
2770 if ((sx->max_rcpt = sx->conn_args.tblock->max_addresses) == 0) sx->max_rcpt = 999999;
2771 sx->single_rcpt_domain = FALSE;
2774 /* For SMTPS we need to wait for the initial OK response. */
2776 #ifndef DISABLE_PIPE_CONNECT
2777 if (sx->early_pipe_active)
2779 sx->pending_BANNER = TRUE;
2780 sx->outblock.cmd_count = 1;
2784 if (!smtp_reap_banner(sx))
2785 goto RESPONSE_FAILED;
2788 greeting_cmd = US"LHLO";
2790 greeting_cmd = US"EHLO";
2793 greeting_cmd = US"HELO";
2795 debug_printf("not sending EHLO (host matches hosts_avoid_esmtp)\n");
2798 if (smtp_write_command(sx,
2799 #ifndef DISABLE_PIPE_CONNECT
2800 sx->early_pipe_active ? SCMD_BUFFER :
2803 "%s %s\r\n", greeting_cmd, sx->helo_data) < 0)
2806 #ifndef DISABLE_PIPE_CONNECT
2807 if (sx->early_pipe_active)
2808 sx->pending_EHLO = TRUE;
2812 if (!smtp_reap_ehlo(sx))
2815 /* The GnuTLS layer in Exim only spots a server-rejection of a client
2816 cert late, under TLS1.3 - which means here; the first time we try to
2817 receive crypted data. Treat it as if it was a connect-time failure.
2818 See also the early-pipe equivalent... which will be hard; every call
2819 to sync_responses will need to check the result.
2820 It would be nicer to have GnuTLS check the cert during the handshake.
2821 Can it do that, with all the flexibility we need? */
2823 tls_errstr = US"error on first read";
2824 goto TLS_CONN_FAILED;
2827 goto RESPONSE_FAILED;
2829 smtp_peer_options = 0;
2833 /* If the host is required to use a secure channel, ensure that we
2837 # ifdef SUPPORT_DANE
2838 || sx->conn_args.dane
2840 || verify_check_given_host(CUSS &ob->hosts_require_tls, sx->conn_args.host) == OK
2843 errno = ERRNO_TLSREQUIRED;
2844 message = string_sprintf("a TLS session is required, but %s",
2845 smtp_peer_options & OPTION_TLS
2846 ? "an attempt to start TLS failed" : "the server did not offer TLS support");
2847 # if defined(SUPPORT_DANE) && !defined(DISABLE_EVENT)
2848 if (sx->conn_args.dane)
2849 (void) event_raise(sx->conn_args.tblock->event_action, US"dane:fail",
2850 smtp_peer_options & OPTION_TLS
2851 ? US"validation-failure" /* could do with better detail */
2852 : US"starttls-not-supported",
2857 #endif /*DISABLE_TLS*/
2859 /* If TLS is active, we have just started it up and re-done the EHLO command,
2860 so its response needs to be analyzed. If TLS is not active and this is a
2861 continued session down a previously-used socket, we haven't just done EHLO, so
2864 if ( !continue_hostname
2866 || tls_out.active.sock >= 0
2870 if (sx->esmtp || sx->lmtp)
2872 #ifndef DISABLE_PIPE_CONNECT
2873 if (!sx->early_pipe_active)
2876 sx->peer_offered = ehlo_response(sx->buffer,
2878 #ifndef DISABLE_PIPE_CONNECT
2879 | (sx->lmtp && ob->lmtp_ignore_quota ? OPTION_IGNQ : 0)
2880 | OPTION_DSN | OPTION_PIPE | OPTION_SIZE
2881 | OPTION_CHUNKING | OPTION_PRDR | OPTION_UTF8
2882 | (tls_out.active.sock >= 0 ? OPTION_EARLY_PIPE : 0) /* not for lmtp */
2886 | (sx->lmtp && ob->lmtp_ignore_quota ? OPTION_IGNQ : 0)
2889 # ifdef SUPPORT_I18N
2890 | (sx->addrlist->prop.utf8_msg ? OPTION_UTF8 : 0)
2891 /*XXX if we hand peercaps on to continued-conn processes,
2892 must not depend on this addr */
2896 | (ob->size_addition >= 0 ? OPTION_SIZE : 0)
2899 #ifndef DISABLE_PIPE_CONNECT
2900 if (tls_out.active.sock >= 0)
2901 sx->ehlo_resp.crypted_features = sx->peer_offered;
2904 #ifdef EXPERIMENTAL_ESMTP_LIMITS
2905 if (tls_out.active.sock >= 0 || !(sx->peer_offered & OPTION_TLS))
2907 ehlo_response_limits_read(sx);
2908 ehlo_response_limits_apply(sx);
2913 /* Set for IGNOREQUOTA if the response to LHLO specifies support and the
2914 lmtp_ignore_quota option was set. */
2916 sx->igquotstr = sx->peer_offered & OPTION_IGNQ ? US" IGNOREQUOTA" : US"";
2918 /* If the response to EHLO specified support for the SIZE parameter, note
2919 this, provided size_addition is non-negative. */
2921 smtp_peer_options |= sx->peer_offered & OPTION_SIZE;
2923 /* Note whether the server supports PIPELINING. If hosts_avoid_esmtp matched
2924 the current host, esmtp will be false, so PIPELINING can never be used. If
2925 the current host matches hosts_avoid_pipelining, don't do it. */
2927 if ( sx->peer_offered & OPTION_PIPE
2928 && verify_check_given_host(CUSS &ob->hosts_avoid_pipelining, sx->conn_args.host) != OK)
2929 smtp_peer_options |= OPTION_PIPE;
2931 DEBUG(D_transport) debug_printf("%susing PIPELINING\n",
2932 smtp_peer_options & OPTION_PIPE ? "" : "not ");
2934 if ( sx->peer_offered & OPTION_CHUNKING
2935 && verify_check_given_host(CUSS &ob->hosts_try_chunking, sx->conn_args.host) == OK)
2936 smtp_peer_options |= OPTION_CHUNKING;
2938 if (smtp_peer_options & OPTION_CHUNKING)
2939 DEBUG(D_transport) debug_printf("CHUNKING usable\n");
2941 #ifndef DISABLE_PRDR
2942 if ( sx->peer_offered & OPTION_PRDR
2943 && verify_check_given_host(CUSS &ob->hosts_try_prdr, sx->conn_args.host) == OK)
2944 smtp_peer_options |= OPTION_PRDR;
2946 if (smtp_peer_options & OPTION_PRDR)
2947 DEBUG(D_transport) debug_printf("PRDR usable\n");
2950 /* Note if the server supports DSN */
2951 smtp_peer_options |= sx->peer_offered & OPTION_DSN;
2952 DEBUG(D_transport) debug_printf("%susing DSN\n",
2953 sx->peer_offered & OPTION_DSN ? "" : "not ");
2955 #ifndef DISABLE_PIPE_CONNECT
2956 if ( sx->early_pipe_ok
2957 && !sx->early_pipe_active
2958 && tls_out.active.sock >= 0
2959 && smtp_peer_options & OPTION_PIPE
2960 && ( sx->ehlo_resp.cleartext_features | sx->ehlo_resp.crypted_features)
2961 & OPTION_EARLY_PIPE)
2963 DEBUG(D_transport) debug_printf("PIPECONNECT usable in future for this IP\n");
2964 sx->ehlo_resp.crypted_auths = study_ehlo_auths(sx);
2965 write_ehlo_cache_entry(sx);
2969 /* Note if the response to EHLO specifies support for the AUTH extension.
2970 If it has, check that this host is one we want to authenticate to, and do
2971 the business. The host name and address must be available when the
2972 authenticator's client driver is running. */
2974 switch (yield = smtp_auth(sx))
2976 default: goto SEND_QUIT;
2978 case FAIL_SEND: goto SEND_FAILED;
2979 case FAIL: goto RESPONSE_FAILED;
2983 sx->pipelining_used = pipelining_active = !!(smtp_peer_options & OPTION_PIPE);
2985 /* The setting up of the SMTP call is now complete. Any subsequent errors are
2986 message-specific. */
2988 sx->setting_up = FALSE;
2991 if (sx->addrlist->prop.utf8_msg)
2995 /* If the transport sets a downconversion mode it overrides any set by ACL
2998 if ((s = ob->utf8_downconvert))
3000 if (!(s = expand_string(s)))
3002 message = string_sprintf("failed to expand utf8_downconvert: %s",
3003 expand_string_message);
3004 set_errno_nohost(sx->addrlist, ERRNO_EXPANDFAIL, message, DEFER, FALSE, &sx->delivery_start);
3010 case '1': sx->addrlist->prop.utf8_downcvt = TRUE;
3011 sx->addrlist->prop.utf8_downcvt_maybe = FALSE;
3013 case '0': sx->addrlist->prop.utf8_downcvt = FALSE;
3014 sx->addrlist->prop.utf8_downcvt_maybe = FALSE;
3016 case '-': if (s[1] == '1')
3018 sx->addrlist->prop.utf8_downcvt = FALSE;
3019 sx->addrlist->prop.utf8_downcvt_maybe = TRUE;
3025 sx->utf8_needed = !sx->addrlist->prop.utf8_downcvt
3026 && !sx->addrlist->prop.utf8_downcvt_maybe;
3027 DEBUG(D_transport) if (!sx->utf8_needed)
3028 debug_printf("utf8: %s downconvert\n",
3029 sx->addrlist->prop.utf8_downcvt ? "mandatory" : "optional");
3032 /* If this is an international message we need the host to speak SMTPUTF8 */
3033 if (sx->utf8_needed && !(sx->peer_offered & OPTION_UTF8))
3035 errno = ERRNO_UTF8_FWD;
3036 goto RESPONSE_FAILED;
3038 #endif /*SUPPORT_I18N*/
3047 if (errno == ECONNREFUSED) /* first-read error on a TFO conn */
3049 /* There is a testing facility for simulating a connection timeout, as I
3050 can't think of any other way of doing this. It converts a connection
3051 refused into a timeout if the timeout is set to 999999. This is done for
3052 a 3whs connection in ip_connect(), but a TFO connection does not error
3053 there - instead it gets ECONNREFUSED on the first data read. Tracking
3054 that a TFO really was done is too hard, or we would set a
3055 sx->pending_conn_done bit and test that in smtp_reap_banner() and
3056 smtp_reap_ehlo(). That would let us also add the conn-timeout to the
3059 if (f.running_in_test_harness && ob->connect_timeout == 999999)
3061 set_errno_nohost(sx->addrlist,
3062 errno == ETIMEDOUT ? ERRNO_CONNECTTIMEOUT : errno,
3063 sx->verify ? US strerror(errno) : NULL,
3064 DEFER, FALSE, &sx->delivery_start);
3065 sx->send_quit = FALSE;
3069 /* really an error on an SMTP read */
3071 sx->send_quit = check_response(sx->conn_args.host, &errno, sx->addrlist->more_errno,
3072 sx->buffer, &code, &message, &pass_message);
3078 message = US string_sprintf("smtp send to %s [%s] failed: %s",
3079 sx->conn_args.host->name, sx->conn_args.host->address, strerror(errno));
3080 sx->send_quit = FALSE;
3086 message = string_sprintf("Remote host closed connection in response to %s"
3087 " (EHLO response was: %s)", smtp_command, sx->buffer);
3088 sx->send_quit = FALSE;
3092 /* This label is jumped to directly when a TLS negotiation has failed,
3093 or was not done for a host for which it is required. Values will be set
3094 in message and errno, and setting_up will always be true. Treat as
3095 a temporary error. */
3099 code = '4', yield = DEFER;
3103 /* The failure happened while setting up the call; see if the failure was
3104 a 5xx response (this will either be on connection, or following HELO - a 5xx
3105 after EHLO causes it to try HELO). If so, and there are no more hosts to try,
3106 fail all addresses, as this host is never going to accept them. For other
3107 errors during setting up (timeouts or whatever), defer all addresses, and
3108 yield DEFER, so that the host is not tried again for a while.
3110 XXX This peeking for another host feels like a layering violation. We want
3111 to note the host as unusable, but down here we shouldn't know if this was
3112 the last host to try for the addr(list). Perhaps the upper layer should be
3113 the one to do set_errno() ? The problem is that currently the addr is where
3114 errno etc. are stashed, but until we run out of hosts to try the errors are
3115 host-specific. Maybe we should enhance the host_item definition? */
3118 sx->ok = FALSE; /* For when reached by GOTO */
3119 set_errno(sx->addrlist, errno, message,
3120 sx->conn_args.host->next
3124 || errno == ERRNO_UTF8_FWD
3128 errno == ECONNREFUSED ? NULL : sx->conn_args.host,
3129 #ifdef EXPERIMENTAL_DSN_INFO
3130 sx->smtp_greeting, sx->helo_response,
3132 &sx->delivery_start);
3139 (void)smtp_write_command(sx, SCMD_FLUSH, "QUIT\r\n");
3142 if (sx->cctx.tls_ctx)
3144 if (sx->send_tlsclose)
3146 tls_close(sx->cctx.tls_ctx, TLS_SHUTDOWN_NOWAIT);
3147 sx->send_tlsclose = FALSE;
3149 sx->cctx.tls_ctx = NULL;
3153 /* Close the socket, and return the appropriate value, first setting
3154 works because the NULL setting is passed back to the calling process, and
3155 remote_max_parallel is forced to 1 when delivering over an existing connection,
3158 HDEBUG(D_transport|D_acl|D_v) debug_printf_indent(" SMTP(close)>>\n");
3161 shutdown(sx->cctx.sock, SHUT_WR);
3162 if (fcntl(sx->cctx.sock, F_SETFL, O_NONBLOCK) == 0)
3163 for (int i = 16; read(sx->cctx.sock, sx->inbuffer, sizeof(sx->inbuffer)) > 0 && i > 0;)
3164 i--; /* drain socket */
3165 sx->send_quit = FALSE;
3167 (void)close(sx->cctx.sock);
3170 #ifndef DISABLE_EVENT
3171 (void) event_raise(sx->conn_args.tblock->event_action, US"tcp:close", NULL, NULL);
3174 smtp_debug_cmd_report();
3175 continue_transport = NULL;
3176 continue_hostname = NULL;
3183 /* Create the string of options that will be appended to the MAIL FROM:
3184 in the connection context buffer */
3187 build_mailcmd_options(smtp_context * sx, address_item * addrlist)
3189 uschar * p = sx->buffer;
3190 address_item * addr;
3195 /* If we know the receiving MTA supports the SIZE qualification, and we know it,
3196 send it, adding something to the message size to allow for imprecision
3197 and things that get added en route. Exim keeps the number of lines
3198 in a message, so we can give an accurate value for the original message, but we
3199 need some additional to handle added headers. (Double "." characters don't get
3200 included in the count.) */
3202 if ( message_size > 0
3203 && sx->peer_offered & OPTION_SIZE && !(sx->avoid_option & OPTION_SIZE))
3205 /*XXX problem here under spool_files_wireformat?
3206 Or just forget about lines? Or inflate by a fixed proportion? */
3208 sprintf(CS p, " SIZE=%d", message_size+message_linecount+(SOB sx->conn_args.ob)->size_addition);
3212 #ifndef DISABLE_PRDR
3213 /* If it supports Per-Recipient Data Responses, and we have more than one recipient,
3216 sx->prdr_active = FALSE;
3217 if (smtp_peer_options & OPTION_PRDR)
3218 for (address_item * addr = addrlist; addr; addr = addr->next)
3219 if (addr->transport_return == PENDING_DEFER)
3221 for (addr = addr->next; addr; addr = addr->next)
3222 if (addr->transport_return == PENDING_DEFER)
3223 { /* at least two recipients to send */
3224 sx->prdr_active = TRUE;
3225 sprintf(CS p, " PRDR"); p += 5;
3233 /* If it supports internationalised messages, and this meesage need that,
3236 if ( sx->peer_offered & OPTION_UTF8
3237 && addrlist->prop.utf8_msg
3238 && !addrlist->prop.utf8_downcvt
3240 Ustrcpy(p, US" SMTPUTF8"), p += 9;
3243 /* check if all addresses have DSN-lasthop flag; do not send RET and ENVID if so */
3244 for (sx->dsn_all_lasthop = TRUE, addr = addrlist, address_count = 0;
3245 addr && address_count < sx->max_rcpt; /*XXX maybe also || sx->single_rcpt_domain ? */
3246 addr = addr->next) if (addr->transport_return == PENDING_DEFER)
3249 if (!(addr->dsn_flags & rf_dsnlasthop))
3251 sx->dsn_all_lasthop = FALSE;
3256 /* Add any DSN flags to the mail command */
3258 if (sx->peer_offered & OPTION_DSN && !sx->dsn_all_lasthop)
3260 if (dsn_ret == dsn_ret_hdrs)
3261 { Ustrcpy(p, US" RET=HDRS"); p += 9; }
3262 else if (dsn_ret == dsn_ret_full)
3263 { Ustrcpy(p, US" RET=FULL"); p += 9; }
3267 string_format(p, sizeof(sx->buffer) - (p-sx->buffer), " ENVID=%s", dsn_envid);
3272 /* If an authenticated_sender override has been specified for this transport
3273 instance, expand it. If the expansion is forced to fail, and there was already
3274 an authenticated_sender for this message, the original value will be used.
3275 Other expansion failures are serious. An empty result is ignored, but there is
3276 otherwise no check - this feature is expected to be used with LMTP and other
3277 cases where non-standard addresses (e.g. without domains) might be required. */
3279 return smtp_mail_auth_str(sx, p, addrlist) ? ERROR : OK;
3284 build_rcptcmd_options(smtp_context * sx, const address_item * addr)
3286 uschar * p = sx->buffer;
3289 /* Add any DSN flags to the rcpt command */
3291 if (sx->peer_offered & OPTION_DSN && !(addr->dsn_flags & rf_dsnlasthop))
3293 if (addr->dsn_flags & rf_dsnflags)
3297 Ustrcpy(p, US" NOTIFY=");
3299 for (int i = 0; i < nelem(rf_list); i++) if (addr->dsn_flags & rf_list[i])
3301 if (!first) *p++ = ',';
3303 Ustrcpy(p, rf_names[i]);
3308 if (addr->dsn_orcpt)
3310 string_format(p, sizeof(sx->buffer) - (p-sx->buffer), " ORCPT=%s",
3321 0 good, rcpt results in addr->transport_return (PENDING_OK, DEFER, FAIL)
3322 -1 MAIL response error
3323 -2 any non-MAIL read i/o error
3324 -3 non-MAIL response timeout
3325 -4 internal error; channel still usable
3330 smtp_write_mail_and_rcpt_cmds(smtp_context * sx, int * yield)
3332 address_item * addr;
3333 #ifdef EXPERIMENTAL_ESMTP_LIMITS
3334 address_item * restart_addr = NULL;
3336 int address_count, pipe_limit;
3339 if (build_mailcmd_options(sx, sx->first_addr) != OK)
3345 /* From here until we send the DATA command, we can make use of PIPELINING
3346 if the server host supports it. The code has to be able to check the responses
3347 at any point, for when the buffer fills up, so we write it totally generally.
3348 When PIPELINING is off, each command written reports that it has flushed the
3351 sx->pending_MAIL = TRUE; /* The block starts with MAIL */
3354 uschar * s = sx->from_addr;
3356 uschar * errstr = NULL;
3358 /* If we must downconvert, do the from-address here. Remember we had to
3359 for the to-addresses (done below), and also (ugly) for re-doing when building
3360 the delivery log line. */
3362 if ( sx->addrlist->prop.utf8_msg
3363 && (sx->addrlist->prop.utf8_downcvt || !(sx->peer_offered & OPTION_UTF8))
3366 if (s = string_address_utf8_to_alabel(s, &errstr), errstr)
3368 set_errno_nohost(sx->addrlist, ERRNO_EXPANDFAIL, errstr, DEFER, FALSE, &sx->delivery_start);
3372 setflag(sx->addrlist, af_utf8_downcvt);
3376 rc = smtp_write_command(sx, pipelining_active ? SCMD_BUFFER : SCMD_FLUSH,
3377 "MAIL FROM:<%s>%s\r\n", s, sx->buffer);
3380 mail_command = string_copy(big_buffer); /* Save for later error message */
3384 case -1: /* Transmission error */
3387 case +1: /* Cmd was sent */
3388 if (!smtp_read_response(sx, sx->buffer, sizeof(sx->buffer), '2',
3389 (SOB sx->conn_args.ob)->command_timeout))
3391 if (errno == 0 && sx->buffer[0] == '4')
3393 errno = ERRNO_MAIL4XX;
3394 sx->addrlist->more_errno |= ((sx->buffer[1] - '0')*10 + sx->buffer[2] - '0') << 8;
3398 sx->pending_MAIL = FALSE;
3401 /* otherwise zero: command queued for pipeline */
3404 /* Pass over all the relevant recipient addresses for this host, which are the
3405 ones that have status PENDING_DEFER. If we are using PIPELINING, we can send
3406 several before we have to read the responses for those seen so far. This
3407 checking is done by a subroutine because it also needs to be done at the end.
3408 Send only up to max_rcpt addresses at a time, leaving next_addr pointing to
3409 the next one if not all are sent.
3411 In the MUA wrapper situation, we want to flush the PIPELINING buffer for the
3412 last address because we want to abort if any recipients have any kind of
3413 problem, temporary or permanent. We know that all recipient addresses will have
3414 the PENDING_DEFER status, because only one attempt is ever made, and we know
3415 that max_rcpt will be large, so all addresses will be done at once.
3417 For verify we flush the pipeline after any (the only) rcpt address. */
3419 for (addr = sx->first_addr, address_count = 0, pipe_limit = 100;
3420 addr && address_count < sx->max_rcpt;
3421 addr = addr->next) if (addr->transport_return == PENDING_DEFER)
3427 #ifdef EXPERIMENTAL_ESMTP_LIMITS
3428 if ( sx->single_rcpt_domain /* restriction on domains */
3429 && address_count > 0 /* not first being sent */
3430 && Ustrcmp(addr->domain, sx->first_addr->domain) != 0 /* dom diff from first */
3433 DEBUG(D_transport) debug_printf("skipping different domain %s\n", addr->domain);
3435 /* Ensure the smtp-response reaper does not think the address had a RCPT
3436 command sent for it. Reset to PENDING_DEFER in smtp_deliver(), where we
3437 goto SEND_MESSAGE. */
3439 addr->transport_return = SKIP;
3440 if (!restart_addr) restart_addr = addr; /* note restart point */
3441 continue; /* skip this one */
3445 addr->dsn_aware = sx->peer_offered & OPTION_DSN
3446 ? dsn_support_yes : dsn_support_no;
3449 if (pipe_limit-- <= 0)
3450 { no_flush = FALSE; pipe_limit = 100; }
3452 no_flush = pipelining_active && !sx->verify
3453 && (!mua_wrapper || addr->next && address_count < sx->max_rcpt);
3455 build_rcptcmd_options(sx, addr);
3457 /* Now send the RCPT command, and process outstanding responses when
3458 necessary. After a timeout on RCPT, we just end the function, leaving the
3459 yield as OK, because this error can often mean that there is a problem with
3460 just one address, so we don't want to delay the host. */
3462 rcpt_addr = transport_rcpt_address(addr, sx->conn_args.tblock->rcpt_include_affixes);
3465 if ( testflag(sx->addrlist, af_utf8_downcvt)
3466 && !(rcpt_addr = string_address_utf8_to_alabel(rcpt_addr, NULL))
3469 /*XXX could we use a per-address errstr here? Not fail the whole send? */
3470 errno = ERRNO_EXPANDFAIL;
3471 return -5; /*XXX too harsh? */
3475 cmds_sent = smtp_write_command(sx, no_flush ? SCMD_BUFFER : SCMD_FLUSH,
3476 "RCPT TO:<%s>%s%s\r\n", rcpt_addr, sx->igquotstr, sx->buffer);
3478 if (cmds_sent < 0) return -5;
3481 switch(sync_responses(sx, cmds_sent, 0))
3483 case 3: sx->ok = TRUE; /* 2xx & 5xx => OK & progress made */
3484 case 2: sx->completed_addr = TRUE; /* 5xx (only) => progress made */
3487 case 1: sx->ok = TRUE; /* 2xx (only) => OK, but if LMTP, */
3488 if (!sx->lmtp) /* can't tell about progress yet */
3489 sx->completed_addr = TRUE;
3490 case 0: /* No 2xx or 5xx, but no probs */
3491 /* If any RCPT got a 452 response then next_addr has been updated
3492 for restarting with a new MAIL on the same connection. Send no more
3493 RCPTs for this MAIL. */
3497 DEBUG(D_transport) debug_printf("seen 452 too-many-rcpts\n");
3498 sx->RCPT_452 = FALSE;
3499 /* sx->next_addr has been reset for fast_retry */
3504 case -1: return -3; /* Timeout on RCPT */
3505 case -2: return -2; /* non-MAIL read i/o error */
3506 default: return -1; /* any MAIL error */
3508 #ifndef DISABLE_PIPE_CONNECT
3509 case -4: return -1; /* non-2xx for pipelined banner or EHLO */
3510 case -5: return -1; /* TLS first-read error */
3514 } /* Loop for next address */
3516 #ifdef EXPERIMENTAL_ESMTP_LIMITS
3517 sx->next_addr = restart_addr ? restart_addr : addr;
3519 sx->next_addr = addr;
3526 /*****************************************************
3527 * Proxy TLS connection for another transport process *
3528 ******************************************************/
3530 Close the unused end of the pipe, fork once more, then use the given buffer
3531 as a staging area, and select on both the given fd and the TLS'd client-fd for
3532 data to read (per the coding in ip_recv() and fd_ready() this is legitimate).
3533 Do blocking full-size writes, and reads under a timeout. Once both input
3534 channels are closed, exit the process.
3538 buf space to use for buffering
3539 bufsiz size of buffer
3540 pfd pipe filedescriptor array; [0] is comms to proxied process
3541 timeout per-read timeout, seconds
3542 host hostname of remote
3548 smtp_proxy_tls(void * ct_ctx, uschar * buf, size_t bsize, int * pfd,
3549 int timeout, const uschar * host)
3551 struct pollfd p[2] = {{.fd = tls_out.active.sock, .events = POLLIN},
3552 {.fd = pfd[0], .events = POLLIN}};
3554 BOOL send_tls_shutdown = TRUE;
3557 if ((rc = exim_fork(US"tls-proxy")))
3558 _exit(rc < 0 ? EXIT_FAILURE : EXIT_SUCCESS);
3560 set_process_info("proxying TLS connection for continued transport to %s\n", host);
3564 time_t time_left = timeout;
3565 time_t time_start = time(NULL);
3570 rc = poll(p, 2, time_left * 1000);
3572 if (rc < 0 && errno == EINTR)
3573 if ((time_left -= time(NULL) - time_start) > 0) continue;
3577 DEBUG(D_transport) if (rc == 0) debug_printf("%s: timed out\n", __FUNCTION__);
3581 /* For errors where not readable, bomb out */
3583 if (p[0].revents & POLLERR || p[1].revents & POLLERR)
3585 DEBUG(D_transport) debug_printf("select: exceptional cond on %s fd\n",
3586 p[0].revents & POLLERR ? "tls" : "proxy");
3587 if (!(p[0].revents & POLLIN || p[1].events & POLLIN))
3589 DEBUG(D_transport) debug_printf("- but also readable; no exit yet\n");
3592 while (rc < 0 || !(p[0].revents & POLLIN || p[1].revents & POLLIN));
3594 /* handle inbound data */
3595 if (p[0].revents & POLLIN)
3596 if ((rc = tls_read(ct_ctx, buf, bsize)) <= 0) /* Expect -1 for EOF; */
3597 { /* that reaps the TLS Close Notify record */
3599 shutdown(pfd[0], SHUT_WR);
3603 for (int nbytes = 0; rc - nbytes > 0; nbytes += i)
3604 if ((i = write(pfd[0], buf + nbytes, rc - nbytes)) < 0) goto done;
3606 /* Handle outbound data. We cannot combine payload and the TLS-close
3607 due to the limitations of the (pipe) channel feeding us. Maybe use a unix-domain
3609 if (p[1].revents & POLLIN)
3610 if ((rc = read(pfd[0], buf, bsize)) <= 0)
3614 # ifdef EXIM_TCP_CORK /* Use _CORK to get TLS Close Notify in FIN segment */
3615 (void) setsockopt(tls_out.active.sock, IPPROTO_TCP, EXIM_TCP_CORK, US &on, sizeof(on));
3617 tls_shutdown_wr(ct_ctx);
3618 send_tls_shutdown = FALSE;
3619 shutdown(tls_out.active.sock, SHUT_WR);
3622 for (int nbytes = 0; rc - nbytes > 0; nbytes += i)
3623 if ((i = tls_write(ct_ctx, buf + nbytes, rc - nbytes, FALSE)) < 0)
3626 while (p[0].fd >= 0 || p[1].fd >= 0);
3629 if (send_tls_shutdown) tls_close(ct_ctx, TLS_SHUTDOWN_NOWAIT);
3631 testharness_pause_ms(100); /* let logging complete */
3632 exim_exit(EXIT_SUCCESS);
3637 /*************************************************
3638 * Deliver address list to given host *
3639 *************************************************/
3641 /* If continue_hostname is not null, we get here only when continuing to
3642 deliver down an existing channel. The channel was passed as the standard
3643 input. TLS is never active on a passed channel; the previous process either
3644 closes it down before passing the connection on, or inserts a TLS-proxy
3645 process and passes on a cleartext conection.
3647 Otherwise, we have to make a connection to the remote host, and do the
3648 initial protocol exchange.
3650 When running as an MUA wrapper, if the sender or any recipient is rejected,
3651 temporarily or permanently, we force failure for all recipients.
3654 addrlist chain of potential addresses to deliver; only those whose
3655 transport_return field is set to PENDING_DEFER are currently
3656 being processed; others should be skipped - they have either
3657 been delivered to an earlier host or IP address, or been
3658 failed by one of them.
3659 host host to deliver to
3660 host_af AF_INET or AF_INET6
3661 defport default TCP/IP port to use if host does not specify, in host
3663 interface interface to bind to, or NULL
3664 tblock transport instance block
3665 message_defer set TRUE if yield is OK, but all addresses were deferred
3666 because of a non-recipient, non-host failure, that is, a
3667 4xx response to MAIL FROM, DATA, or ".". This is a defer
3668 that is specific to the message.
3669 suppress_tls if TRUE, don't attempt a TLS connection - this is set for
3670 a second attempt after TLS initialization fails
3672 Returns: OK - the connection was made and the delivery attempted;
3673 the result for each address is in its data block.
3674 DEFER - the connection could not be made, or something failed
3675 while setting up the SMTP session, or there was a
3676 non-message-specific error, such as a timeout.
3677 ERROR - a filter command is specified for this transport,
3678 and there was a problem setting it up; OR helo_data
3679 or add_headers or authenticated_sender is specified
3680 for this transport, and the string failed to expand
3682 For all non-OK returns the first addr of the list carries the
3683 time taken for the attempt.
3687 smtp_deliver(address_item *addrlist, host_item *host, int host_af, int defport,
3688 uschar *interface, transport_instance *tblock,
3689 BOOL *message_defer, BOOL suppress_tls)
3691 smtp_transport_options_block * ob = SOB tblock->options_block;
3696 uschar *message = NULL;
3697 uschar new_message_id[MESSAGE_ID_LENGTH + 1];
3698 smtp_context * sx = store_get(sizeof(*sx), GET_TAINTED); /* tainted, for the data buffers */
3699 BOOL pass_message = FALSE;
3700 #ifdef EXPERIMENTAL_ESMTP_LIMITS
3701 BOOL mail_limit = FALSE;
3706 BOOL tcw_done = FALSE, tcw = FALSE;
3708 *message_defer = FALSE;
3710 memset(sx, 0, sizeof(*sx));
3711 sx->addrlist = addrlist;
3712 sx->conn_args.host = host;
3713 sx->conn_args.host_af = host_af;
3715 sx->conn_args.interface = interface;
3716 sx->helo_data = NULL;
3717 sx->conn_args.tblock = tblock;
3718 sx->conn_args.sock = -1;
3719 gettimeofday(&sx->delivery_start, NULL);
3720 sx->sync_addr = sx->first_addr = addrlist;
3727 /* Get the channel set up ready for a message, MAIL FROM being the next
3728 SMTP command to send. */
3730 if ((rc = smtp_setup_conn(sx, suppress_tls)) != OK)
3732 timesince(&addrlist->delivery_time, &sx->delivery_start);
3738 /* If the connection used DANE, ignore for now any addresses with incompatible
3739 domains. The SNI has to be the domain. Arrange a whole new TCP conn later,
3740 just in case only TLS isn't enough. */
3742 if (sx->conn_args.dane)
3744 const uschar * dane_domain = sx->first_addr->domain;
3746 for (address_item * a = sx->first_addr->next; a; a = a->next)
3747 if ( a->transport_return == PENDING_DEFER
3748 && Ustrcmp(dane_domain, a->domain) != 0)
3750 DEBUG(D_transport) debug_printf("DANE: holding %s for later\n", a->domain);
3752 a->transport_return = DANE;
3757 /* If there is a filter command specified for this transport, we can now
3758 set it up. This cannot be done until the identity of the host is known. */
3760 if (tblock->filter_command)
3762 transport_filter_timeout = tblock->filter_timeout;
3764 /* On failure, copy the error to all addresses, abandon the SMTP call, and
3767 if (!transport_set_up_command(&transport_filter_argv,
3768 tblock->filter_command, TRUE, DEFER, addrlist, FALSE,
3769 string_sprintf("%.50s transport filter", tblock->name), NULL))
3771 set_errno_nohost(addrlist->next, addrlist->basic_errno, addrlist->message, DEFER,
3772 FALSE, &sx->delivery_start);
3777 if ( transport_filter_argv
3778 && *transport_filter_argv
3779 && **transport_filter_argv
3780 && smtp_peer_options & OPTION_CHUNKING
3781 #ifndef DISABLE_DKIM
3782 /* When dkim signing, chunking is handled even with a transport-filter */
3783 && !(ob->dkim.dkim_private_key && ob->dkim.dkim_domain && ob->dkim.dkim_selector)
3784 && !ob->dkim.force_bodyhash
3788 smtp_peer_options &= ~OPTION_CHUNKING;
3789 DEBUG(D_transport) debug_printf("CHUNKING not usable due to transport filter\n");
3793 /* For messages that have more than the maximum number of envelope recipients,
3794 we want to send several transactions down the same SMTP connection. (See
3795 comments in deliver.c as to how this reconciles, heuristically, with
3796 remote_max_parallel.) This optimization was added to Exim after the following
3797 code was already working. The simplest way to put it in without disturbing the
3798 code was to use a goto to jump back to this point when there is another
3799 transaction to handle. */
3802 sx->from_addr = return_path;
3803 sx->sync_addr = sx->first_addr;
3805 sx->send_rset = TRUE;
3806 sx->completed_addr = FALSE;
3809 /* If we are a continued-connection-after-verify the MAIL and RCPT
3810 commands were already sent; do not re-send but do mark the addrs as
3811 having been accepted up to RCPT stage. A traditional cont-conn
3812 always has a sequence number greater than one. */
3814 if (continue_hostname && continue_sequence == 1)
3816 /* sx->pending_MAIL = FALSE; */
3818 /* sx->next_addr = NULL; */
3820 for (address_item * addr = addrlist; addr; addr = addr->next)
3821 addr->transport_return = PENDING_OK;
3825 /* Initiate a message transfer. */
3827 switch(smtp_write_mail_and_rcpt_cmds(sx, &yield))
3830 case -1: case -2: goto RESPONSE_FAILED;
3831 case -3: goto END_OFF;
3832 case -4: goto SEND_QUIT;
3833 default: goto SEND_FAILED;
3836 /* If we are an MUA wrapper, abort if any RCPTs were rejected, either
3837 permanently or temporarily. We should have flushed and synced after the last
3845 for (a = sx->first_addr, cnt = 0; a && cnt < sx->max_rcpt; a = a->next, cnt++)
3846 if (a->transport_return != PENDING_OK)
3848 /*XXX could we find a better errno than 0 here? */
3849 set_errno_nohost(addrlist, 0, a->message, FAIL,
3850 testflag(a, af_pass_message), &sx->delivery_start);
3857 /* If ok is TRUE, we know we have got at least one good recipient, and must now
3858 send DATA, but if it is FALSE (in the normal, non-wrapper case), we may still
3859 have a good recipient buffered up if we are pipelining. We don't want to waste
3860 time sending DATA needlessly, so we only send it if either ok is TRUE or if we
3861 are pipelining. The responses are all handled by sync_responses().
3862 If using CHUNKING, do not send a BDAT until we know how big a chunk we want
3865 if ( !(smtp_peer_options & OPTION_CHUNKING)
3866 && (sx->ok || (pipelining_active && !mua_wrapper)))
3868 int count = smtp_write_command(sx, SCMD_FLUSH, "DATA\r\n");
3870 if (count < 0) goto SEND_FAILED;
3871 switch(sync_responses(sx, count, sx->ok ? +1 : -1))
3873 case 3: sx->ok = TRUE; /* 2xx & 5xx => OK & progress made */
3874 case 2: sx->completed_addr = TRUE; /* 5xx (only) => progress made */
3877 case 1: sx->ok = TRUE; /* 2xx (only) => OK, but if LMTP, */
3878 if (!sx->lmtp) sx->completed_addr = TRUE; /* can't tell about progress yet */
3879 case 0: break; /* No 2xx or 5xx, but no probs */
3881 case -1: goto END_OFF; /* Timeout on RCPT */
3883 #ifndef DISABLE_PIPE_CONNECT
3884 case -5: /* TLS first-read error */
3885 case -4: HDEBUG(D_transport)
3886 debug_printf("failed reaping pipelined cmd responses\n");
3888 default: goto RESPONSE_FAILED; /* I/O error, or any MAIL/DATA error */
3890 pipelining_active = FALSE;
3891 data_command = string_copy(big_buffer); /* Save for later error message */
3894 /* If there were no good recipients (but otherwise there have been no
3895 problems), just set ok TRUE, since we have handled address-specific errors
3896 already. Otherwise, it's OK to send the message. Use the check/escape mechanism
3897 for handling the SMTP dot-handling protocol, flagging to apply to headers as
3898 well as body. Set the appropriate timeout value to be used for each chunk.
3899 (Haven't been able to make it work using select() for writing yet.) */
3902 && (!(smtp_peer_options & OPTION_CHUNKING) || !pipelining_active))
3904 /* Save the first address of the next batch. */
3905 sx->first_addr = sx->next_addr;
3911 transport_ctx tctx = {
3912 .u = {.fd = sx->cctx.sock}, /*XXX will this need TLS info? */
3915 .check_string = US".",
3916 .escape_string = US"..", /* Escaping strings */
3918 topt_use_crlf | topt_escape_headers
3919 | (tblock->body_only ? topt_no_headers : 0)
3920 | (tblock->headers_only ? topt_no_body : 0)
3921 | (tblock->return_path_add ? topt_add_return_path : 0)
3922 | (tblock->delivery_date_add ? topt_add_delivery_date : 0)
3923 | (tblock->envelope_to_add ? topt_add_envelope_to : 0)
3926 /* If using CHUNKING we need a callback from the generic transport
3927 support to us, for the sending of BDAT smtp commands and the reaping
3928 of responses. The callback needs a whole bunch of state so set up
3929 a transport-context structure to be passed around. */
3931 if (smtp_peer_options & OPTION_CHUNKING)
3933 tctx.check_string = tctx.escape_string = NULL;
3934 tctx.options |= topt_use_bdat;
3935 tctx.chunk_cb = smtp_chunk_cmd_callback;
3936 sx->pending_BDAT = FALSE;
3937 sx->good_RCPT = sx->ok;
3939 tctx.smtp_context = sx;
3942 tctx.options |= topt_end_dot;
3944 /* Save the first address of the next batch. */
3945 sx->first_addr = sx->next_addr;
3947 /* Responses from CHUNKING commands go in buffer. Otherwise,
3948 there has not been a response. */
3952 sigalrm_seen = FALSE;
3953 transport_write_timeout = ob->data_timeout;
3954 smtp_command = US"sending data block"; /* For error messages */
3955 DEBUG(D_transport|D_v)
3956 if (smtp_peer_options & OPTION_CHUNKING)
3957 debug_printf(" will write message using CHUNKING\n");
3959 debug_printf(" SMTP>> writing message and terminating \".\"\n");
3960 transport_count = 0;
3962 #ifndef DISABLE_DKIM
3964 # ifdef MEASURE_TIMING
3966 gettimeofday(&t0, NULL);
3968 dkim_exim_sign_init();
3969 # ifdef EXPERIMENTAL_ARC
3971 uschar * s = ob->arc_sign;
3974 if (!(ob->dkim.arc_signspec = s = expand_string(s)))
3976 if (!f.expand_string_forcedfail)
3978 message = US"failed to expand arc_sign";
3985 /* Ask dkim code to hash the body for ARC */
3986 (void) arc_ams_setup_sign_bodyhash();
3987 ob->dkim.force_bodyhash = TRUE;
3992 # ifdef MEASURE_TIMING
3993 report_time_since(&t0, US"dkim_exim_sign_init (delta)");
3998 /* See if we can pipeline QUIT. Reasons not to are
3999 - pipelining not active
4000 - not ok to send quit
4001 - errors in amtp transation responses
4002 - more addrs to send for this message or this host
4003 - this message was being retried
4004 - more messages for this host
4005 If we can, we want the message-write to not flush (the tail end of) its data out. */
4007 if ( sx->pipelining_used
4008 && (sx->ok && sx->completed_addr || smtp_peer_options & OPTION_CHUNKING)
4010 && !(sx->first_addr || f.continue_more)
4011 && f.deliver_firsttime
4014 smtp_compare_t t_compare =
4015 {.tblock = tblock, .current_sender_address = sender_address};
4020 ( tls_out.active.sock < 0 && !continue_proxy_cipher
4021 || verify_check_given_host(CUSS &ob->hosts_nopass_tls, host) != OK
4025 transport_check_waiting(tblock->name, host->name,
4026 tblock->connection_max_messages, new_message_id,
4027 (oicf)smtp_are_same_identities, (void*)&t_compare);
4030 HDEBUG(D_transport) debug_printf("will pipeline QUIT\n");
4031 tctx.options |= topt_no_flush;
4035 #ifndef DISABLE_DKIM
4036 sx->ok = dkim_transport_write_message(&tctx, &ob->dkim, CUSS &message);
4038 sx->ok = transport_write_message(&tctx, 0);
4041 /* transport_write_message() uses write() because it is called from other
4042 places to write to non-sockets. This means that under some OS (e.g. Solaris)
4043 it can exit with "Broken pipe" as its error. This really means that the
4044 socket got closed at the far end. */
4046 transport_write_timeout = 0; /* for subsequent transports */
4048 /* Failure can either be some kind of I/O disaster (including timeout),
4049 or the failure of a transport filter or the expansion of added headers.
4050 Or, when CHUNKING, it can be a protocol-detected failure. */
4053 if (message) goto SEND_FAILED;
4054 else goto RESPONSE_FAILED;
4056 /* We used to send the terminating "." explicitly here, but because of
4057 buffering effects at both ends of TCP/IP connections, you don't gain
4058 anything by keeping it separate, so it might as well go in the final
4059 data buffer for efficiency. This is now done by setting the topt_end_dot
4062 smtp_command = US"end of data";
4064 /* If we can pipeline a QUIT with the data them send it now. If a new message
4065 for this host appeared in the queue while data was being sent, we will not see
4066 it and it will have to wait for a queue run. If there was one but another
4067 thread took it, we might attempt to send it - but locking of spoolfiles will
4068 detect that. Use _MORE to get QUIT in FIN segment. */
4070 if (tcw_done && !tcw)
4072 /*XXX jgh 2021/03/10 google et. al screwup. G, at least, sends TCP FIN in response to TLS
4073 close-notify. Under TLS 1.3, violating RFC.
4074 However, TLS 1.2 does not have half-close semantics. */
4076 if ( sx->cctx.tls_ctx
4077 #if 0 && !defined(DISABLE_TLS)
4078 && Ustrcmp(tls_out.ver, "TLS1.3") != 0
4080 || !f.deliver_firsttime
4082 { /* Send QUIT now and not later */
4083 (void)smtp_write_command(sx, SCMD_FLUSH, "QUIT\r\n");
4084 sx->send_quit = FALSE;
4087 { /* add QUIT to the output buffer */
4088 (void)smtp_write_command(sx, SCMD_MORE, "QUIT\r\n");
4089 sx->send_quit = FALSE; /* avoid sending it later */
4092 if (sx->cctx.tls_ctx && sx->send_tlsclose) /* need to send TLS Close Notify */
4094 # ifdef EXIM_TCP_CORK /* Use _CORK to get Close Notify in FIN segment */
4095 (void) setsockopt(sx->cctx.sock, IPPROTO_TCP, EXIM_TCP_CORK, US &on, sizeof(on));
4097 tls_shutdown_wr(sx->cctx.tls_ctx);
4098 sx->send_tlsclose = FALSE; /* avoid later repeat */
4101 HDEBUG(D_transport|D_acl|D_v) debug_printf_indent(" SMTP(shutdown)>>\n");
4102 shutdown(sx->cctx.sock, SHUT_WR); /* flush output buffer, with TCP FIN */
4106 if (smtp_peer_options & OPTION_CHUNKING && sx->cmd_count > 1)
4108 /* Reap any outstanding MAIL & RCPT commands, but not a DATA-go-ahead */
4109 switch(sync_responses(sx, sx->cmd_count-1, 0))
4111 case 3: sx->ok = TRUE; /* 2xx & 5xx => OK & progress made */
4112 case 2: sx->completed_addr = TRUE; /* 5xx (only) => progress made */
4115 case 1: sx->ok = TRUE; /* 2xx (only) => OK, but if LMTP, */
4116 if (!sx->lmtp) sx->completed_addr = TRUE; /* can't tell about progress yet */
4117 case 0: break; /* No 2xx or 5xx, but no probs */
4119 case -1: goto END_OFF; /* Timeout on RCPT */
4121 #ifndef DISABLE_PIPE_CONNECT
4122 case -5: /* TLS first-read error */
4123 case -4: HDEBUG(D_transport)
4124 debug_printf("failed reaping pipelined cmd responses\n");
4126 default: goto RESPONSE_FAILED; /* I/O error, or any MAIL/DATA error */
4130 #ifndef DISABLE_PRDR
4131 /* For PRDR we optionally get a partial-responses warning followed by the
4132 individual responses, before going on with the overall response. If we don't
4133 get the warning then deal with per non-PRDR. */
4137 sx->ok = smtp_read_response(sx, sx->buffer, sizeof(sx->buffer), '3', ob->final_timeout);
4138 if (!sx->ok && errno == 0) switch(sx->buffer[0])
4140 case '2': sx->prdr_active = FALSE;
4143 case '4': errno = ERRNO_DATA4XX;
4144 addrlist->more_errno |=
4145 ((sx->buffer[1] - '0')*10 + sx->buffer[2] - '0') << 8;
4152 /* For non-PRDR SMTP, we now read a single response that applies to the
4153 whole message. If it is OK, then all the addresses have been delivered. */
4157 sx->ok = smtp_read_response(sx, sx->buffer, sizeof(sx->buffer), '2',
4159 if (!sx->ok && errno == 0 && sx->buffer[0] == '4')
4161 errno = ERRNO_DATA4XX;
4162 addrlist->more_errno |= ((sx->buffer[1] - '0')*10 + sx->buffer[2] - '0') << 8;
4166 /* For LMTP, we get back a response for every RCPT command that we sent;
4167 some may be accepted and some rejected. For those that get a response, their
4168 status is fixed; any that are accepted have been handed over, even if later
4169 responses crash - at least, that's how I read RFC 2033.
4171 If all went well, mark the recipient addresses as completed, record which
4172 host/IPaddress they were delivered to, and cut out RSET when sending another
4173 message down the same channel. Write the completed addresses to the journal
4174 now so that they are recorded in case there is a crash of hardware or
4175 software before the spool gets updated. Also record the final SMTP
4176 confirmation if needed (for SMTP only). */
4181 struct timeval delivery_time;
4183 uschar * conf = NULL;
4185 timesince(&delivery_time, &sx->delivery_start);
4186 sx->send_rset = FALSE;
4187 pipelining_active = FALSE;
4189 /* Set up confirmation if needed - applies only to SMTP */
4192 #ifdef DISABLE_EVENT
4193 LOGGING(smtp_confirmation) &&
4198 const uschar * s = string_printing(sx->buffer);
4199 /* deconst cast ok here as string_printing was checked to have alloc'n'copied */
4200 conf = s == sx->buffer ? US string_copy(s) : US s;
4203 /* Process all transported addresses - for LMTP or PRDR, read a status for
4204 each one. We used to drop out at first_addr, until someone returned a 452
4205 followed by a 250... and we screwed up the accepted addresses. */
4207 for (address_item * addr = addrlist; addr; addr = addr->next)
4209 if (addr->transport_return != PENDING_OK) continue;
4211 /* LMTP - if the response fails badly (e.g. timeout), use it for all the
4212 remaining addresses. Otherwise, it's a return code for just the one
4213 address. For temporary errors, add a retry item for the address so that
4214 it doesn't get tried again too soon. */
4216 #ifndef DISABLE_PRDR
4217 if (sx->lmtp || sx->prdr_active)
4222 if (!smtp_read_response(sx, sx->buffer, sizeof(sx->buffer), '2',
4225 if (errno != 0 || sx->buffer[0] == 0) goto RESPONSE_FAILED;
4226 addr->message = string_sprintf(
4227 #ifndef DISABLE_PRDR
4228 "%s error after %s: %s", sx->prdr_active ? "PRDR":"LMTP",
4230 "LMTP error after %s: %s",
4232 data_command, string_printing(sx->buffer));
4233 setflag(addr, af_pass_message); /* Allow message to go to user */
4234 if (sx->buffer[0] == '5')
4235 addr->transport_return = FAIL;
4238 errno = ERRNO_DATA4XX;
4239 addr->more_errno |= ((sx->buffer[1] - '0')*10 + sx->buffer[2] - '0') << 8;
4240 addr->transport_return = DEFER;
4241 #ifndef DISABLE_PRDR
4242 if (!sx->prdr_active)
4244 retry_add_item(addr, addr->address_retry_key, 0);
4248 sx->completed_addr = TRUE; /* NOW we can set this flag */
4249 if (LOGGING(smtp_confirmation))
4251 const uschar *s = string_printing(sx->buffer);
4252 /* deconst cast ok here as string_printing was checked to have alloc'n'copied */
4253 conf = (s == sx->buffer) ? US string_copy(s) : US s;
4257 /* SMTP, or success return from LMTP for this address. Pass back the
4258 actual host that was used. */
4260 addr->transport_return = OK;
4261 addr->host_used = host;
4262 addr->delivery_time = delivery_time;
4263 addr->special_action = flag;
4264 addr->message = conf;
4266 if (tcp_out_fastopen)
4268 setflag(addr, af_tcp_fastopen_conn);
4269 if (tcp_out_fastopen >= TFO_USED_NODATA) setflag(addr, af_tcp_fastopen);
4270 if (tcp_out_fastopen >= TFO_USED_DATA) setflag(addr, af_tcp_fastopen_data);
4272 if (sx->pipelining_used) setflag(addr, af_pipelining);
4273 #ifndef DISABLE_PIPE_CONNECT
4274 if (sx->early_pipe_active) setflag(addr, af_early_pipe);
4276 #ifndef DISABLE_PRDR
4277 if (sx->prdr_active) setflag(addr, af_prdr_used);
4279 if (smtp_peer_options & OPTION_CHUNKING) setflag(addr, af_chunking_used);
4282 #ifndef DISABLE_PRDR
4283 if (!sx->prdr_active)
4286 /* Update the journal. For homonymic addresses, use the base address plus
4287 the transport name. See lots of comments in deliver.c about the reasons
4288 for the complications when homonyms are involved. Just carry on after
4289 write error, as it may prove possible to update the spool file later. */
4291 if (testflag(addr, af_homonym))
4292 sprintf(CS sx->buffer, "%.500s/%s\n", addr->unique + 3, tblock->name);
4294 sprintf(CS sx->buffer, "%.500s\n", addr->unique);
4296 DEBUG(D_deliver) debug_printf("S:journalling %s", sx->buffer);
4297 len = Ustrlen(CS sx->buffer);
4298 if (write(journal_fd, sx->buffer, len) != len)
4299 log_write(0, LOG_MAIN|LOG_PANIC, "failed to write journal for "
4300 "%s: %s", sx->buffer, strerror(errno));
4304 #ifndef DISABLE_PRDR
4305 if (sx->prdr_active)
4307 const uschar * overall_message;
4309 /* PRDR - get the final, overall response. For any non-success
4310 upgrade all the address statuses. */
4312 sx->ok = smtp_read_response(sx, sx->buffer, sizeof(sx->buffer), '2',
4316 if(errno == 0 && sx->buffer[0] == '4')
4318 errno = ERRNO_DATA4XX;
4319 addrlist->more_errno |= ((sx->buffer[1] - '0')*10 + sx->buffer[2] - '0') << 8;
4321 for (address_item * addr = addrlist; addr != sx->first_addr; addr = addr->next)
4322 if (sx->buffer[0] == '5' || addr->transport_return == OK)
4323 addr->transport_return = PENDING_OK; /* allow set_errno action */
4324 goto RESPONSE_FAILED;
4327 /* Append the overall response to the individual PRDR response for logging
4328 and update the journal, or setup retry. */
4330 overall_message = string_printing(sx->buffer);
4331 for (address_item * addr = addrlist; addr != sx->first_addr; addr = addr->next)
4332 if (addr->transport_return == OK)
4333 addr->message = string_sprintf("%s\\n%s", addr->message, overall_message);
4335 for (address_item * addr = addrlist; addr != sx->first_addr; addr = addr->next)
4336 if (addr->transport_return == OK)
4338 if (testflag(addr, af_homonym))
4339 sprintf(CS sx->buffer, "%.500s/%s\n", addr->unique + 3, tblock->name);
4341 sprintf(CS sx->buffer, "%.500s\n", addr->unique);
4343 DEBUG(D_deliver) debug_printf("journalling(PRDR) %s\n", sx->buffer);
4344 len = Ustrlen(CS sx->buffer);
4345 if (write(journal_fd, sx->buffer, len) != len)
4346 log_write(0, LOG_MAIN|LOG_PANIC, "failed to write journal for "
4347 "%s: %s", sx->buffer, strerror(errno));
4349 else if (addr->transport_return == DEFER)
4350 /*XXX magic value -2 ? maybe host+message ? */
4351 retry_add_item(addr, addr->address_retry_key, -2);
4355 /* Ensure the journal file is pushed out to disk. */
4357 if (EXIMfsync(journal_fd) < 0)
4358 log_write(0, LOG_MAIN|LOG_PANIC, "failed to fsync journal: %s",
4364 /* Handle general (not specific to one address) failures here. The value of ok
4365 is used to skip over this code on the falling through case. A timeout causes a
4366 deferral. Other errors may defer or fail according to the response code, and
4367 may set up a special errno value, e.g. after connection chopped, which is
4368 assumed if errno == 0 and there is no text in the buffer. If control reaches
4369 here during the setting up phase (i.e. before MAIL FROM) then always defer, as
4370 the problem is not related to this specific message. */
4375 uschar * set_message;
4381 /* Clear send_quit flag if needed. Do not set. */
4382 sx->send_quit &= check_response(host, &save_errno, addrlist->more_errno,
4383 sx->buffer, &code, &message, &pass_message);
4391 message = string_sprintf("smtp send to %s [%s] failed: %s",
4392 host->name, host->address, message ? message : US strerror(save_errno));
4393 sx->send_quit = FALSE;
4401 sx->ok = FALSE; /* For when reached by GOTO */
4402 set_message = message;
4404 /* We want to handle timeouts after MAIL or "." and loss of connection after
4405 "." specially. They can indicate a problem with the sender address or with
4406 the contents of the message rather than a real error on the connection. These
4407 cases are treated in the same way as a 4xx response. This next bit of code
4408 does the classification. */
4415 message_error = TRUE;
4419 message_error = Ustrncmp(smtp_command,"MAIL",4) == 0 ||
4420 Ustrncmp(smtp_command,"end ",4) == 0;
4423 case ERRNO_SMTPCLOSED:
4424 message_error = Ustrncmp(smtp_command,"end ",4) == 0;
4427 #ifndef DISABLE_DKIM
4429 /* DKIM signing failure: avoid thinking we pipelined quit,
4430 just abandon the message and close the socket. */
4432 message_error = FALSE;
4433 # ifndef DISABLE_TLS
4434 if (sx->cctx.tls_ctx)
4436 tls_close(sx->cctx.tls_ctx,
4437 sx->send_tlsclose ? TLS_SHUTDOWN_WAIT : TLS_SHUTDOWN_WONLY);
4438 sx->cctx.tls_ctx = NULL;
4444 message_error = FALSE;
4448 /* Handle the cases that are treated as message errors. These are:
4450 (a) negative response or timeout after MAIL
4451 (b) negative response after DATA
4452 (c) negative response or timeout or dropped connection after "."
4453 (d) utf8 support required and not offered
4455 It won't be a negative response or timeout after RCPT, as that is dealt
4456 with separately above. The action in all cases is to set an appropriate
4457 error code for all the addresses, but to leave yield set to OK because the
4458 host itself has not failed. Of course, it might in practice have failed
4459 when we've had a timeout, but if so, we'll discover that at the next
4460 delivery attempt. For a temporary error, set the message_defer flag, and
4461 write to the logs for information if this is not the last host. The error
4462 for the last host will be logged as part of the address's log line. */
4466 if (mua_wrapper) code = '5'; /* Force hard failure in wrapper mode */
4468 /* If there's an errno, the message contains just the identity of
4473 else /* Anything other than 5 is treated as temporary */
4477 message = US string_sprintf("%s: %s", message, strerror(save_errno));
4479 write_logs(host, message, sx->first_addr ? sx->first_addr->basic_errno : 0);
4481 *message_defer = TRUE;
4484 DEBUG(D_transport) if (sx->cctx.sock >= 0)
4487 if (ioctl(sx->cctx.sock, TIOCOUTQ, &n) == 0)
4488 debug_printf("%d bytes remain in socket output buffer\n", n);
4492 /* Otherwise, we have an I/O error or a timeout other than after MAIL or
4493 ".", or some other transportation error. We defer all addresses and yield
4494 DEFER, except for the case of failed add_headers expansion, or a transport
4495 filter failure, when the yield should be ERROR, to stop it trying other
4500 #ifndef DISABLE_PIPE_CONNECT
4501 /* If we were early-pipelinng and the actual EHLO response did not match
4502 the cached value we assumed, we could have detected it and passed a
4503 custom errno through to here. It would be nice to RSET and retry right
4504 away, but to reliably do that we eould need an extra synch point before
4505 we committed to data and that would discard half the gained roundrips.
4506 Or we could summarily drop the TCP connection. but that is also ugly.
4507 Instead, we ignore the possibility (having freshened the cache) and rely
4508 on the server telling us with a nonmessage error if we have tried to
4509 do something it no longer supports. */
4512 yield = (save_errno == ERRNO_CHHEADER_FAIL ||
4513 save_errno == ERRNO_FILTER_FAIL) ? ERROR : DEFER;
4517 set_errno(addrlist, save_errno, set_message, set_rc, pass_message, host,
4518 #ifdef EXPERIMENTAL_DSN_INFO
4519 sx->smtp_greeting, sx->helo_response,
4521 &sx->delivery_start);
4524 /* If all has gone well, send_quit will be set TRUE, implying we can end the
4525 SMTP session tidily. However, if there were too many addresses to send in one
4526 message (indicated by first_addr being non-NULL) we want to carry on with the
4527 rest of them. Also, it is desirable to send more than one message down the SMTP
4528 connection if there are several waiting, provided we haven't already sent so
4529 many as to hit the configured limit. The function transport_check_waiting looks
4530 for a waiting message and returns its id. Then transport_pass_socket tries to
4531 set up a continued delivery by passing the socket on to another process. The
4532 variable send_rset is FALSE if a message has just been successfully transferred.
4534 If we are already sending down a continued channel, there may be further
4535 addresses not yet delivered that are aimed at the same host, but which have not
4536 been passed in this run of the transport. In this case, continue_more will be
4537 true, and all we should do is send RSET if necessary, and return, leaving the
4540 However, if no address was disposed of, i.e. all addresses got 4xx errors, we
4541 do not want to continue with other messages down the same channel, because that
4542 can lead to looping between two or more messages, all with the same,
4543 temporarily failing address(es). [The retry information isn't updated yet, so
4544 new processes keep on trying.] We probably also don't want to try more of this
4545 message's addresses either.
4547 If we have started a TLS session, we have to end it before passing the
4548 connection to a new process. However, not all servers can handle this (Exim
4549 can), so we do not pass such a connection on if the host matches
4550 hosts_nopass_tls. */
4553 debug_printf("ok=%d send_quit=%d send_rset=%d continue_more=%d "
4554 "yield=%d first_address is %sNULL\n", sx->ok, sx->send_quit,
4555 sx->send_rset, f.continue_more, yield, sx->first_addr ? "not " : "");
4557 if (sx->completed_addr && sx->ok && sx->send_quit)
4558 #ifdef EXPERIMENTAL_ESMTP_LIMITS
4559 if (mail_limit = continue_sequence >= sx->max_mail)
4562 debug_printf("reached limit %u for MAILs per conn\n", sx->max_mail);
4567 smtp_compare_t t_compare =
4568 {.tblock = tblock, .current_sender_address = sender_address};
4570 if ( sx->first_addr /* more addrs for this message */
4571 || f.continue_more /* more addrs for continued-host */
4572 || tcw_done && tcw /* more messages for host */
4575 ( tls_out.active.sock < 0 && !continue_proxy_cipher
4576 || verify_check_given_host(CUSS &ob->hosts_nopass_tls, host) != OK
4580 transport_check_waiting(tblock->name, host->name,
4581 sx->max_mail, new_message_id,
4582 (oicf)smtp_are_same_identities, (void*)&t_compare)
4589 if (! (sx->ok = smtp_write_command(sx, SCMD_FLUSH, "RSET\r\n") >= 0))
4591 msg = US string_sprintf("smtp send to %s [%s] failed: %s", host->name,
4592 host->address, strerror(errno));
4593 sx->send_quit = FALSE;
4595 else if (! (sx->ok = smtp_read_response(sx, sx->buffer, sizeof(sx->buffer),
4596 '2', ob->command_timeout)))
4599 sx->send_quit = check_response(host, &errno, 0, sx->buffer, &code, &msg,
4603 DEBUG(D_transport) debug_printf("H=%s [%s] %s\n",
4604 host->name, host->address, msg);
4608 /* Either RSET was not needed, or it succeeded */
4615 int socket_fd = sx->cctx.sock;
4617 if (sx->first_addr) /* More addresses still to be sent */
4618 { /* for this message */
4619 #ifdef EXPERIMENTAL_ESMTP_LIMITS
4620 /* Any that we marked as skipped, reset to do now */
4621 for (address_item * a = sx->first_addr; a; a = a->next)
4622 if (a->transport_return == SKIP)
4623 a->transport_return = PENDING_DEFER;
4625 continue_sequence++; /* for consistency */
4626 clearflag(sx->first_addr, af_new_conn);
4627 setflag(sx->first_addr, af_cont_conn); /* Causes * in logging */
4628 pipelining_active = sx->pipelining_used; /* was cleared at DATA */
4632 /* Unless caller said it already has more messages listed for this host,
4633 pass the connection on to a new Exim process (below, the call to
4634 transport_pass_socket). If the caller has more ready, just return with
4635 the connection still open. */
4638 if (tls_out.active.sock >= 0)
4639 if ( f.continue_more
4640 || verify_check_given_host(CUSS &ob->hosts_noproxy_tls, host) == OK)
4642 /* Before passing the socket on, or returning to caller with it still
4643 open, we must shut down TLS. Not all MTAs allow for the continuation
4644 of the SMTP session when TLS is shut down. We test for this by sending
4645 a new EHLO. If we don't get a good response, we don't attempt to pass
4648 tls_close(sx->cctx.tls_ctx,
4649 sx->send_tlsclose ? TLS_SHUTDOWN_WAIT : TLS_SHUTDOWN_WONLY);
4650 sx->send_tlsclose = FALSE;
4651 sx->cctx.tls_ctx = NULL;
4652 tls_out.active.sock = -1;
4653 smtp_peer_options = smtp_peer_options_wrap;
4655 && smtp_write_command(sx, SCMD_FLUSH, "EHLO %s\r\n", sx->helo_data)
4657 && smtp_read_response(sx, sx->buffer, sizeof(sx->buffer),
4658 '2', ob->command_timeout);
4660 if (sx->ok && f.continue_more)
4661 goto TIDYUP; /* More addresses for another run */
4665 /* Set up a pipe for proxying TLS for the new transport process */
4667 smtp_peer_options |= OPTION_TLS;
4668 if ((sx->ok = socketpair(AF_UNIX, SOCK_STREAM, 0, pfd) == 0))
4671 set_errno(sx->first_addr, errno, US"internal allocation problem",
4673 # ifdef EXPERIMENTAL_DSN_INFO
4674 sx->smtp_greeting, sx->helo_response,
4676 &sx->delivery_start);
4680 if (f.continue_more)
4681 goto TIDYUP; /* More addresses for another run */
4683 /* If the socket is successfully passed, we mustn't send QUIT (or
4684 indeed anything!) from here. */
4686 /*XXX DSN_INFO: assume likely to do new HELO; but for greet we'll want to
4687 propagate it from the initial
4689 if (sx->ok && transport_pass_socket(tblock->name, host->name,
4690 host->address, new_message_id, socket_fd
4691 #ifdef EXPERIMENTAL_ESMTP_LIMITS
4692 , sx->peer_limit_mail, sx->peer_limit_rcpt, sx->peer_limit_rcptdom
4696 sx->send_quit = FALSE;
4698 /* We have passed the client socket to a fresh transport process.
4699 If TLS is still active, we need to proxy it for the transport we
4700 just passed the baton to. Fork a child to to do it, and return to
4701 get logging done asap. Which way to place the work makes assumptions
4702 about post-fork prioritisation which may not hold on all platforms. */
4704 if (tls_out.active.sock >= 0)
4706 int pid = exim_fork(US"tls-proxy-interproc");
4707 if (pid == 0) /* child; fork again to disconnect totally */
4709 /* does not return */
4710 smtp_proxy_tls(sx->cctx.tls_ctx, sx->buffer, sizeof(sx->buffer), pfd,
4711 ob->command_timeout, host->name);
4714 if (pid > 0) /* parent */
4717 /* tidy the inter-proc to disconn the proxy proc */
4718 waitpid(pid, NULL, 0);
4719 tls_close(sx->cctx.tls_ctx, TLS_NO_SHUTDOWN);
4720 sx->cctx.tls_ctx = NULL;
4721 (void)close(sx->cctx.sock);
4723 continue_transport = NULL;
4724 continue_hostname = NULL;
4727 log_write(0, LOG_PANIC_DIE, "fork failed");
4733 /* If RSET failed and there are addresses left, they get deferred. */
4735 set_errno(sx->first_addr, errno, msg, DEFER, FALSE, host,
4736 #ifdef EXPERIMENTAL_DSN_INFO
4737 sx->smtp_greeting, sx->helo_response,
4739 &sx->delivery_start);
4743 /* End off tidily with QUIT unless the connection has died or the socket has
4744 been passed to another process. */
4748 { /* Use _MORE to get QUIT in FIN segment */
4749 (void)smtp_write_command(sx, SCMD_MORE, "QUIT\r\n");
4751 if (sx->cctx.tls_ctx && sx->send_tlsclose)
4753 # ifdef EXIM_TCP_CORK /* Use _CORK to get TLS Close Notify in FIN segment */
4754 (void) setsockopt(sx->cctx.sock, IPPROTO_TCP, EXIM_TCP_CORK, US &on, sizeof(on));
4756 tls_shutdown_wr(sx->cctx.tls_ctx);
4757 sx->send_tlsclose = FALSE;
4764 /* Close the socket, and return the appropriate value, first setting
4765 works because the NULL setting is passed back to the calling process, and
4766 remote_max_parallel is forced to 1 when delivering over an existing connection,
4768 If all went well and continue_more is set, we shouldn't actually get here if
4769 there are further addresses, as the return above will be taken. However,
4770 writing RSET might have failed, or there may be other addresses whose hosts are
4771 specified in the transports, and therefore not visible at top level, in which
4772 case continue_more won't get set. */
4776 /* This flushes data queued in the socket, being the QUIT and any TLS Close,
4777 sending them along with the client FIN flag. Us (we hope) sending FIN first
4778 means we (client) take the TIME_WAIT state, so the server (which likely has a
4779 higher connection rate) does not have to. */
4781 HDEBUG(D_transport|D_acl|D_v) debug_printf_indent(" SMTP(shutdown)>>\n");
4782 shutdown(sx->cctx.sock, SHUT_WR);
4785 if (sx->send_quit || tcw_done && !tcw)
4787 /* Wait for (we hope) ack of our QUIT, and a server FIN. Discard any data
4788 received, then discard the socket. Any packet received after then, or receive
4789 data still in the socket, will get a RST - hence the pause/drain. */
4791 /* Reap the response to QUIT, timing out after one second */
4792 (void) smtp_read_response(sx, sx->buffer, sizeof(sx->buffer), '2', 1);
4794 if (sx->cctx.tls_ctx)
4798 /* Reap the TLS Close Notify from the server, timing out after one second */
4799 sigalrm_seen = FALSE;
4802 n = tls_read(sx->cctx.tls_ctx, sx->inbuffer, sizeof(sx->inbuffer));
4803 while (!sigalrm_seen && n > 0);
4806 if (sx->send_tlsclose)
4808 # ifdef EXIM_TCP_CORK
4809 (void) setsockopt(sx->cctx.sock, IPPROTO_TCP, EXIM_TCP_CORK, US &on, sizeof(on));
4811 tls_close(sx->cctx.tls_ctx, TLS_SHUTDOWN_WAIT);
4814 tls_close(sx->cctx.tls_ctx, TLS_SHUTDOWN_WONLY);
4815 sx->cctx.tls_ctx = NULL;
4819 /* Drain any trailing data from the socket before close, to avoid sending a RST */
4821 if ( poll_one_fd(sx->cctx.sock, POLLIN, 20) != 0 /* 20ms */
4822 && fcntl(sx->cctx.sock, F_SETFL, O_NONBLOCK) == 0)
4823 for (int i = 16, n; /* drain socket */
4824 (n = read(sx->cctx.sock, sx->inbuffer, sizeof(sx->inbuffer))) > 0 && i > 0;
4825 i--) HDEBUG(D_transport|D_acl|D_v)
4828 debug_printf_indent(" SMTP(drain %d bytes)<< %.*s\n", n, m, sx->inbuffer);
4829 for (m = 0; m < n; m++)
4830 debug_printf("0x%02x\n", sx->inbuffer[m]);
4833 HDEBUG(D_transport|D_acl|D_v) debug_printf_indent(" SMTP(close)>>\n");
4834 (void)close(sx->cctx.sock);
4836 continue_transport = NULL;
4837 continue_hostname = NULL;
4838 smtp_debug_cmd_report();
4840 #ifndef DISABLE_EVENT
4841 (void) event_raise(tblock->event_action, US"tcp:close", NULL, NULL);
4847 sx->first_addr = NULL;
4848 for (address_item * a = sx->addrlist->next; a; a = a->next)
4849 if (a->transport_return == DANE)
4851 a->transport_return = PENDING_DEFER;
4852 if (!sx->first_addr)
4854 /* Remember the new start-point in the addrlist, for smtp_setup_conn()
4855 to get the domain string for SNI */
4858 clearflag(a, af_cont_conn);
4859 setflag(a, af_new_conn); /* clear * from logging */
4860 DEBUG(D_transport) debug_printf("DANE: go-around for %s\n", a->domain);
4863 continue_sequence = 1; /* for consistency */
4868 #ifdef EXPERIMENTAL_ESMTP_LIMITS
4869 if (mail_limit && sx->first_addr)
4871 /* Reset the sequence count since we closed the connection. This is flagged
4872 on the pipe back to the delivery process so that a non-continued-conn delivery
4875 continue_sequence = 1; /* for consistency */
4876 clearflag(sx->first_addr, af_cont_conn);
4877 setflag(sx->first_addr, af_new_conn); /* clear * from logging */
4886 if (dane_held) for (address_item * a = sx->addrlist->next; a; a = a->next)
4887 if (a->transport_return == DANE)
4888 a->transport_return = PENDING_DEFER;
4896 /*************************************************
4897 * Closedown entry point *
4898 *************************************************/
4900 /* This function is called when exim is passed an open smtp channel
4901 from another incarnation, but the message which it has been asked
4902 to deliver no longer exists. The channel is on stdin.
4904 We might do fancy things like looking for another message to send down
4905 the channel, but if the one we sought has gone, it has probably been
4906 delivered by some other process that itself will seek further messages,
4907 so just close down our connection.
4909 Argument: pointer to the transport instance block
4914 smtp_transport_closedown(transport_instance *tblock)
4916 smtp_transport_options_block * ob = SOB tblock->options_block;
4917 client_conn_ctx cctx;
4920 uschar inbuffer[4096];
4921 uschar outbuffer[16];
4923 /*XXX really we need an active-smtp-client ctx, rather than assuming stdout */
4924 cctx.sock = fileno(stdin);
4925 cctx.tls_ctx = cctx.sock == tls_out.active.sock ? tls_out.active.tls_ctx : NULL;
4927 sx.inblock.cctx = &cctx;
4928 sx.inblock.buffer = inbuffer;
4929 sx.inblock.buffersize = sizeof(inbuffer);
4930 sx.inblock.ptr = inbuffer;
4931 sx.inblock.ptrend = inbuffer;
4933 sx.outblock.cctx = &cctx;
4934 sx.outblock.buffersize = sizeof(outbuffer);
4935 sx.outblock.buffer = outbuffer;
4936 sx.outblock.ptr = outbuffer;
4937 sx.outblock.cmd_count = 0;
4938 sx.outblock.authenticating = FALSE;
4940 (void)smtp_write_command(&sx, SCMD_FLUSH, "QUIT\r\n");
4941 (void)smtp_read_response(&sx, buffer, sizeof(buffer), '2', ob->command_timeout);
4942 (void)close(cctx.sock);
4947 /*************************************************
4948 * Prepare addresses for delivery *
4949 *************************************************/
4951 /* This function is called to flush out error settings from previous delivery
4952 attempts to other hosts. It also records whether we got here via an MX record
4953 or not in the more_errno field of the address. We are interested only in
4954 addresses that are still marked DEFER - others may have got delivered to a
4955 previously considered IP address. Set their status to PENDING_DEFER to indicate
4956 which ones are relevant this time.
4959 addrlist the list of addresses
4960 host the host we are delivering to
4962 Returns: the first address for this delivery
4965 static address_item *
4966 prepare_addresses(address_item *addrlist, host_item *host)
4968 address_item *first_addr = NULL;
4969 for (address_item * addr = addrlist; addr; addr = addr->next)
4970 if (addr->transport_return == DEFER)
4972 if (!first_addr) first_addr = addr;
4973 addr->transport_return = PENDING_DEFER;
4974 addr->basic_errno = 0;
4975 addr->more_errno = (host->mx >= 0)? 'M' : 'A';
4976 addr->message = NULL;
4978 addr->cipher = NULL;
4979 addr->ourcert = NULL;
4980 addr->peercert = NULL;
4981 addr->peerdn = NULL;
4982 addr->ocsp = OCSP_NOT_REQ;
4983 addr->tlsver = NULL;
4985 #ifdef EXPERIMENTAL_DSN_INFO
4986 addr->smtp_greeting = NULL;
4987 addr->helo_response = NULL;
4995 /*************************************************
4996 * Main entry point *
4997 *************************************************/
4999 /* See local README for interface details. As this is a remote transport, it is
5000 given a chain of addresses to be delivered in one connection, if possible. It
5001 always returns TRUE, indicating that each address has its own independent
5002 status set, except if there is a setting up problem, in which case it returns
5006 smtp_transport_entry(
5007 transport_instance *tblock, /* data for this instantiation */
5008 address_item *addrlist) /* addresses we are working on */
5011 int hosts_defer = 0;
5013 int hosts_looked_up = 0;
5014 int hosts_retry = 0;
5015 int hosts_serial = 0;
5016 int hosts_total = 0;
5017 int total_hosts_tried = 0;
5018 BOOL expired = TRUE;
5019 uschar *expanded_hosts = NULL;
5021 uschar *tid = string_sprintf("%s transport", tblock->name);
5022 smtp_transport_options_block *ob = SOB tblock->options_block;
5023 host_item *hostlist = addrlist->host_list;
5024 host_item *host = NULL;
5028 debug_printf("%s transport entered\n", tblock->name);
5029 for (address_item * addr = addrlist; addr; addr = addr->next)
5030 debug_printf(" %s\n", addr->address);
5033 debug_printf("hostlist:\n");
5034 for (host_item * host = hostlist; host; host = host->next)
5035 debug_printf(" '%s' IP %s port %d\n", host->name, host->address, host->port);
5037 if (continue_hostname)
5038 debug_printf("already connected to %s [%s] (on fd %d)\n",
5039 continue_hostname, continue_host_address,
5040 cutthrough.cctx.sock >= 0 ? cutthrough.cctx.sock : 0);
5043 /* Check the restrictions on line length */
5045 if (max_received_linelength > ob->message_linelength_limit)
5048 gettimeofday(&now, NULL);
5050 for (address_item * addr = addrlist; addr; addr = addr->next)
5051 if (addr->transport_return == DEFER)
5052 addr->transport_return = PENDING_DEFER;
5054 set_errno_nohost(addrlist, ERRNO_SMTPFORMAT,
5055 US"message has lines too long for transport", FAIL, TRUE, &now);
5059 /* Set the flag requesting that these hosts be added to the waiting
5060 database if the delivery fails temporarily or if we are running with
5061 queue_smtp or a 2-stage queue run. This gets unset for certain
5062 kinds of error, typically those that are specific to the message. */
5064 update_waiting = TRUE;
5066 /* If a host list is not defined for the addresses - they must all have the
5067 same one in order to be passed to a single transport - or if the transport has
5068 a host list with hosts_override set, use the host list supplied with the
5069 transport. It is an error for this not to exist. */
5071 if (!hostlist || (ob->hosts_override && ob->hosts))
5075 addrlist->message = string_sprintf("%s transport called with no hosts set",
5077 addrlist->transport_return = PANIC;
5078 return FALSE; /* Only top address has status */
5081 DEBUG(D_transport) debug_printf("using the transport's hosts: %s\n",
5084 /* If the transport's host list contains no '$' characters, and we are not
5085 randomizing, it is fixed and therefore a chain of hosts can be built once
5086 and for all, and remembered for subsequent use by other calls to this
5087 transport. If, on the other hand, the host list does contain '$', or we are
5088 randomizing its order, we have to rebuild it each time. In the fixed case,
5089 as the hosts string will never be used again, it doesn't matter that we
5090 replace all the : characters with zeros. */
5094 uschar *s = ob->hosts;
5096 if (Ustrchr(s, '$'))
5098 if (!(expanded_hosts = expand_string(s)))
5100 addrlist->message = string_sprintf("failed to expand list of hosts "
5101 "\"%s\" in %s transport: %s", s, tblock->name, expand_string_message);
5102 addrlist->transport_return = f.search_find_defer ? DEFER : PANIC;
5103 return FALSE; /* Only top address has status */
5105 DEBUG(D_transport) debug_printf("expanded list of hosts \"%s\" to "
5106 "\"%s\"\n", s, expanded_hosts);
5110 if (ob->hosts_randomize) s = expanded_hosts = string_copy(s);
5114 log_write(0, LOG_MAIN|LOG_PANIC,
5115 "attempt to use tainted host list '%s' from '%s' in transport %s",
5116 s, ob->hosts, tblock->name);
5117 /* Avoid leaking info to an attacker */
5118 addrlist->message = US"internal configuration error";
5119 addrlist->transport_return = PANIC;
5123 host_build_hostlist(&hostlist, s, ob->hosts_randomize);
5125 /* Check that the expansion yielded something useful. */
5129 string_sprintf("%s transport has empty hosts setting", tblock->name);
5130 addrlist->transport_return = PANIC;
5131 return FALSE; /* Only top address has status */
5134 /* If there was no expansion of hosts, save the host list for
5137 if (!expanded_hosts) ob->hostlist = hostlist;
5140 /* This is not the first time this transport has been run in this delivery;
5141 the host list was built previously. */
5144 hostlist = ob->hostlist;
5147 /* The host list was supplied with the address. If hosts_randomize is set, we
5148 must sort it into a random order if it did not come from MX records and has not
5149 already been randomized (but don't bother if continuing down an existing
5152 else if (ob->hosts_randomize && hostlist->mx == MX_NONE && !continue_hostname)
5154 host_item *newlist = NULL;
5157 host_item *h = hostlist;
5158 hostlist = hostlist->next;
5160 h->sort_key = random_number(100);
5167 else if (h->sort_key < newlist->sort_key)
5174 host_item *hh = newlist;
5177 if (h->sort_key < hh->next->sort_key) break;
5185 hostlist = addrlist->host_list = newlist;
5188 /* Sort out the default port. */
5190 if (!smtp_get_port(ob->port, addrlist, &defport, tid)) return FALSE;
5192 /* For each host-plus-IP-address on the list:
5194 . If this is a continued delivery and the host isn't the one with the
5195 current connection, skip.
5197 . If the status is unusable (i.e. previously failed or retry checked), skip.
5199 . If no IP address set, get the address, either by turning the name into
5200 an address, calling gethostbyname if gethostbyname is on, or by calling
5201 the DNS. The DNS may yield multiple addresses, in which case insert the
5202 extra ones into the list.
5204 . Get the retry data if not previously obtained for this address and set the
5205 field which remembers the state of this address. Skip if the retry time is
5206 not reached. If not, remember whether retry data was found. The retry string
5207 contains both the name and the IP address.
5209 . Scan the list of addresses and mark those whose status is DEFER as
5210 PENDING_DEFER. These are the only ones that will be processed in this cycle
5213 . Make a delivery attempt - addresses marked PENDING_DEFER will be tried.
5214 Some addresses may be successfully delivered, others may fail, and yet
5215 others may get temporary errors and so get marked DEFER.
5217 . The return from the delivery attempt is OK if a connection was made and a
5218 valid SMTP dialogue was completed. Otherwise it is DEFER.
5220 . If OK, add a "remove" retry item for this host/IPaddress, if any.
5222 . If fail to connect, or other defer state, add a retry item.
5224 . If there are any addresses whose status is still DEFER, carry on to the
5225 next host/IPaddress, unless we have tried the number of hosts given
5226 by hosts_max_try or hosts_max_try_hardlimit; otherwise return. Note that
5227 there is some fancy logic for hosts_max_try that means its limit can be
5228 overstepped in some circumstances.
5230 If we get to the end of the list, all hosts have deferred at least one address,
5231 or not reached their retry times. If delay_after_cutoff is unset, it requests a
5232 delivery attempt to those hosts whose last try was before the arrival time of
5233 the current message. To cope with this, we have to go round the loop a second
5234 time. After that, set the status and error data for any addresses that haven't
5235 had it set already. */
5237 for (int cutoff_retry = 0;
5238 expired && cutoff_retry < (ob->delay_after_cutoff ? 1 : 2);
5241 host_item *nexthost = NULL;
5242 int unexpired_hosts_tried = 0;
5243 BOOL continue_host_tried = FALSE;
5245 retry_non_continued:
5246 for (host = hostlist;
5248 && unexpired_hosts_tried < ob->hosts_max_try
5249 && total_hosts_tried < ob->hosts_max_try_hardlimit;
5254 BOOL host_is_expired = FALSE;
5255 BOOL message_defer = FALSE;
5256 BOOL some_deferred = FALSE;
5257 address_item *first_addr = NULL;
5258 uschar *interface = NULL;
5259 uschar *retry_host_key = NULL;
5260 uschar *retry_message_key = NULL;
5261 uschar *serialize_key = NULL;
5263 /* Default next host is next host. :-) But this can vary if the
5264 hosts_max_try limit is hit (see below). It may also be reset if a host
5265 address is looked up here (in case the host was multihomed). */
5267 nexthost = host->next;
5269 /* If the address hasn't yet been obtained from the host name, look it up
5270 now, unless the host is already marked as unusable. If it is marked as
5271 unusable, it means that the router was unable to find its IP address (in
5272 the DNS or wherever) OR we are in the 2nd time round the cutoff loop, and
5273 the lookup failed last time. We don't get this far if *all* MX records
5274 point to non-existent hosts; that is treated as a hard error.
5276 We can just skip this host entirely. When the hosts came from the router,
5277 the address will timeout based on the other host(s); when the address is
5278 looked up below, there is an explicit retry record added.
5280 Note that we mustn't skip unusable hosts if the address is not unset; they
5281 may be needed as expired hosts on the 2nd time round the cutoff loop. */
5285 int new_port, flags;
5287 if (host->status >= hstatus_unusable)
5289 DEBUG(D_transport) debug_printf("%s has no address and is unusable - skipping\n",
5294 DEBUG(D_transport) debug_printf("getting address for %s\n", host->name);
5296 /* The host name is permitted to have an attached port. Find it, and
5297 strip it from the name. Just remember it for now. */
5299 new_port = host_item_get_port(host);
5301 /* Count hosts looked up */
5305 /* Find by name if so configured, or if it's an IP address. We don't
5306 just copy the IP address, because we need the test-for-local to happen. */
5308 flags = HOST_FIND_BY_A | HOST_FIND_BY_AAAA;
5309 if (ob->dns_qualify_single) flags |= HOST_FIND_QUALIFY_SINGLE;
5310 if (ob->dns_search_parents) flags |= HOST_FIND_SEARCH_PARENTS;
5312 if (ob->gethostbyname || string_is_ip_address(host->name, NULL) != 0)
5313 rc = host_find_byname(host, NULL, flags, NULL, TRUE);
5315 rc = host_find_bydns(host, NULL, flags, NULL, NULL, NULL,
5316 &ob->dnssec, /* domains for request/require */
5319 /* Update the host (and any additional blocks, resulting from
5320 multihoming) with a host-specific port, if any. */
5322 for (host_item * hh = host; hh != nexthost; hh = hh->next) hh->port = new_port;
5324 /* Failure to find the host at this time (usually DNS temporary failure)
5325 is really a kind of routing failure rather than a transport failure.
5326 Therefore we add a retry item of the routing kind, not to stop us trying
5327 to look this name up here again, but to ensure the address gets timed
5328 out if the failures go on long enough. A complete failure at this point
5329 commonly points to a configuration error, but the best action is still
5330 to carry on for the next host. */
5332 if (rc == HOST_FIND_AGAIN || rc == HOST_FIND_SECURITY || rc == HOST_FIND_FAILED)
5334 retry_add_item(addrlist, string_sprintf("R:%s", host->name), 0);
5336 if (rc == HOST_FIND_AGAIN) hosts_defer++; else hosts_fail++;
5337 DEBUG(D_transport) debug_printf("rc = %s for %s\n", (rc == HOST_FIND_AGAIN)?
5338 "HOST_FIND_AGAIN" : "HOST_FIND_FAILED", host->name);
5339 host->status = hstatus_unusable;
5341 for (address_item * addr = addrlist; addr; addr = addr->next)
5343 if (addr->transport_return != DEFER) continue;
5344 addr->basic_errno = ERRNO_UNKNOWNHOST;
5345 addr->message = string_sprintf(
5346 rc == HOST_FIND_SECURITY
5347 ? "lookup of IP address for %s was insecure"
5348 : "failed to lookup IP address for %s",
5354 /* If the host is actually the local host, we may have a problem, or
5355 there may be some cunning configuration going on. In the problem case,
5356 log things and give up. The default transport status is already DEFER. */
5358 if (rc == HOST_FOUND_LOCAL && !ob->allow_localhost)
5360 for (address_item * addr = addrlist; addr; addr = addr->next)
5362 addr->basic_errno = ERRNO_HOST_IS_LOCAL;
5363 addr->message = string_sprintf("%s transport found host %s to be "
5364 "local", tblock->name, host->name);
5368 } /* End of block for IP address lookup */
5370 /* If this is a continued delivery, we are interested only in the host
5371 which matches the name of the existing open channel. The check is put
5372 here after the local host lookup, in case the name gets expanded as a
5373 result of the lookup. Set expired FALSE, to save the outer loop executing
5376 if (continue_hostname)
5377 if ( Ustrcmp(continue_hostname, host->name) != 0
5378 || Ustrcmp(continue_host_address, host->address) != 0
5382 continue; /* With next host */
5385 continue_host_tried = TRUE;
5387 /* Reset the default next host in case a multihomed host whose addresses
5388 are not looked up till just above added to the host list. */
5390 nexthost = host->next;
5392 /* If queue_smtp is set (-odqs or the first part of a 2-stage run), or the
5393 domain is in queue_smtp_domains, we don't actually want to attempt any
5394 deliveries. When doing a queue run, queue_smtp_domains is always unset. If
5395 there is a lookup defer in queue_smtp_domains, proceed as if the domain
5396 were not in it. We don't want to hold up all SMTP deliveries! Except when
5397 doing a two-stage queue run, don't do this if forcing. */
5399 if ( (!f.deliver_force || f.queue_2stage)
5401 || match_isinlist(addrlist->domain,
5402 CUSS &queue_smtp_domains, 0,
5403 &domainlist_anchor, NULL, MCL_DOMAIN, TRUE, NULL) == OK)
5406 DEBUG(D_transport) debug_printf("first-pass routing only\n");
5408 for (address_item * addr = addrlist; addr; addr = addr->next)
5409 if (addr->transport_return == DEFER)
5410 addr->message = US"first-pass only routing due to -odqs, "
5411 "queue_smtp_domains or control=queue";
5412 continue; /* With next host */
5415 /* Count hosts being considered - purely for an intelligent comment
5416 if none are usable. */
5420 /* Set $host and $host address now in case they are needed for the
5421 interface expansion or the serialize_hosts check; they remain set if an
5422 actual delivery happens. */
5424 deliver_host = host->name;
5425 deliver_host_address = host->address;
5426 lookup_dnssec_authenticated = host->dnssec == DS_YES ? US"yes"
5427 : host->dnssec == DS_NO ? US"no"
5430 /* Set up a string for adding to the retry key if the port number is not
5431 the standard SMTP port. A host may have its own port setting that overrides
5434 pistring = string_sprintf(":%d", host->port == PORT_NONE
5435 ? defport : host->port);
5436 if (Ustrcmp(pistring, ":25") == 0) pistring = US"";
5438 /* Select IPv4 or IPv6, and choose an outgoing interface. If the interface
5439 string is set, even if constant (as different transports can have different
5440 constant settings), we must add it to the key that is used for retries,
5441 because connections to the same host from a different interface should be
5442 treated separately. */
5444 host_af = Ustrchr(host->address, ':') ? AF_INET6 : AF_INET;
5446 uschar * s = ob->interface;
5449 if (!smtp_get_interface(s, host_af, addrlist, &interface, tid))
5451 pistring = string_sprintf("%s/%s", pistring, interface);
5455 /* The first time round the outer loop, check the status of the host by
5456 inspecting the retry data. The second time round, we are interested only
5457 in expired hosts that haven't been tried since this message arrived. */
5459 if (cutoff_retry == 0)
5462 /* Ensure the status of the address is set by checking retry data if
5463 necessary. There may be host-specific retry data (applicable to all
5464 messages) and also data for retries of a specific message at this host.
5465 If either of these retry records are actually read, the keys used are
5466 returned to save recomputing them later. */
5468 if (exp_bool(addrlist, US"transport", tblock->name, D_transport,
5469 US"retry_include_ip_address", ob->retry_include_ip_address,
5470 ob->expand_retry_include_ip_address, &incl_ip) != OK)
5471 continue; /* with next host */
5473 host_is_expired = retry_check_address(addrlist->domain, host, pistring,
5474 incl_ip, &retry_host_key, &retry_message_key);
5476 DEBUG(D_transport) debug_printf("%s [%s]%s retry-status = %s\n", host->name,
5477 host->address ? host->address : US"", pistring,
5478 host->status == hstatus_usable ? "usable"
5479 : host->status == hstatus_unusable ? "unusable"
5480 : host->status == hstatus_unusable_expired ? "unusable (expired)" : "?");
5482 /* Skip this address if not usable at this time, noting if it wasn't
5483 actually expired, both locally and in the address. */
5485 switch (host->status)
5487 case hstatus_unusable:
5489 setflag(addrlist, af_retry_skipped);
5492 case hstatus_unusable_expired:
5495 case hwhy_retry: hosts_retry++; break;
5496 case hwhy_failed: hosts_fail++; break;
5498 case hwhy_deferred: hosts_defer++; break;
5501 /* If there was a retry message key, implying that previously there
5502 was a message-specific defer, we don't want to update the list of
5503 messages waiting for these hosts. */
5505 if (retry_message_key) update_waiting = FALSE;
5506 continue; /* With the next host or IP address */
5510 /* Second time round the loop: if the address is set but expired, and
5511 the message is newer than the last try, let it through. */
5516 || host->status != hstatus_unusable_expired
5517 || host->last_try > received_time.tv_sec)
5519 DEBUG(D_transport) debug_printf("trying expired host %s [%s]%s\n",
5520 host->name, host->address, pistring);
5521 host_is_expired = TRUE;
5524 /* Setting "expired=FALSE" doesn't actually mean not all hosts are expired;
5525 it remains TRUE only if all hosts are expired and none are actually tried.
5530 /* If this host is listed as one to which access must be serialized,
5531 see if another Exim process has a connection to it, and if so, skip
5532 this host. If not, update the database to record our connection to it
5533 and remember this for later deletion. Do not do any of this if we are
5534 sending the message down a pre-existing connection. */
5536 if ( !continue_hostname
5537 && verify_check_given_host(CUSS &ob->serialize_hosts, host) == OK)
5539 serialize_key = string_sprintf("host-serialize-%s", host->name);
5540 if (!enq_start(serialize_key, 1))
5543 debug_printf("skipping host %s because another Exim process "
5544 "is connected to it\n", host->name);
5550 /* OK, we have an IP address that is not waiting for its retry time to
5551 arrive (it might be expired) OR (second time round the loop) we have an
5552 expired host that hasn't been tried since the message arrived. Have a go
5553 at delivering the message to it. First prepare the addresses by flushing
5554 out the result of previous attempts, and finding the first address that
5555 is still to be delivered. */
5557 first_addr = prepare_addresses(addrlist, host);
5559 DEBUG(D_transport) debug_printf("delivering %s to %s [%s] (%s%s)\n",
5560 message_id, host->name, host->address, addrlist->address,
5561 addrlist->next ? ", ..." : "");
5563 set_process_info("delivering %s to %s [%s]%s (%s%s)",
5564 message_id, host->name, host->address, pistring, addrlist->address,
5565 addrlist->next ? ", ..." : "");
5567 /* This is not for real; don't do the delivery. If there are
5568 any remaining hosts, list them. */
5573 gettimeofday(&now, NULL);
5574 set_errno_nohost(addrlist, 0, NULL, OK, FALSE, &now);
5575 for (address_item * addr = addrlist; addr; addr = addr->next)
5577 addr->host_used = host;
5578 addr->special_action = '*';
5579 addr->message = US"delivery bypassed by -N option";
5583 debug_printf("*** delivery by %s transport bypassed by -N option\n"
5584 "*** host and remaining hosts:\n", tblock->name);
5585 for (host_item * host2 = host; host2; host2 = host2->next)
5586 debug_printf(" %s [%s]\n", host2->name,
5587 host2->address ? host2->address : US"unset");
5592 /* This is for real. If the host is expired, we don't count it for
5593 hosts_max_retry. This ensures that all hosts must expire before an address
5594 is timed out, unless hosts_max_try_hardlimit (which protects against
5595 lunatic DNS configurations) is reached.
5597 If the host is not expired and we are about to hit the hosts_max_retry
5598 limit, check to see if there is a subsequent hosts with a different MX
5599 value. If so, make that the next host, and don't count this one. This is a
5600 heuristic to make sure that different MXs do get tried. With a normal kind
5601 of retry rule, they would get tried anyway when the earlier hosts were
5602 delayed, but if the domain has a "retry every time" type of rule - as is
5603 often used for the the very large ISPs, that won't happen. */
5608 /* Make a copy of the host if it is local to this invocation
5609 of the transport. */
5613 thost = store_get(sizeof(host_item), GET_UNTAINTED);
5615 thost->name = string_copy(host->name);
5616 thost->address = string_copy(host->address);
5621 if (!host_is_expired && ++unexpired_hosts_tried >= ob->hosts_max_try)
5624 debug_printf("hosts_max_try limit reached with this host\n");
5625 for (host_item * h = host; h; h = h->next) if (h->mx != host->mx)
5628 unexpired_hosts_tried--;
5629 DEBUG(D_transport) debug_printf("however, a higher MX host exists "
5630 "and will be tried\n");
5635 /* Attempt the delivery. */
5637 total_hosts_tried++;
5638 rc = smtp_deliver(addrlist, thost, host_af, defport, interface, tblock,
5639 &message_defer, FALSE);
5642 OK => connection made, each address contains its result;
5643 message_defer is set for message-specific defers (when all
5644 recipients are marked defer)
5645 DEFER => there was a non-message-specific delivery problem;
5646 ERROR => there was a problem setting up the arguments for a filter,
5647 or there was a problem with expanding added headers
5650 /* If the result is not OK, there was a non-message-specific problem.
5651 If the result is DEFER, we need to write to the logs saying what happened
5652 for this particular host, except in the case of authentication and TLS
5653 failures, where the log has already been written. If all hosts defer a
5654 general message is written at the end. */
5656 if (rc == DEFER && first_addr->basic_errno != ERRNO_AUTHFAIL
5657 && first_addr->basic_errno != ERRNO_TLSFAILURE)
5658 write_logs(host, first_addr->message, first_addr->basic_errno);
5660 #ifndef DISABLE_EVENT
5662 deferred_event_raise(first_addr, host, US"msg:host:defer");
5665 /* If STARTTLS was accepted, but there was a failure in setting up the
5666 TLS session (usually a certificate screwup), and the host is not in
5667 hosts_require_tls, and tls_tempfail_tryclear is true, try again, with
5668 TLS forcibly turned off. We have to start from scratch with a new SMTP
5669 connection. That's why the retry is done from here, not from within
5670 smtp_deliver(). [Rejections of STARTTLS itself don't screw up the
5671 session, so the in-clear transmission after those errors, if permitted,
5672 happens inside smtp_deliver().] */
5676 && first_addr->basic_errno == ERRNO_TLSFAILURE
5677 && ob->tls_tempfail_tryclear
5678 && verify_check_given_host(CUSS &ob->hosts_require_tls, host) != OK
5681 log_write(0, LOG_MAIN,
5682 "%s: delivering unencrypted to H=%s [%s] (not in hosts_require_tls)",
5683 first_addr->message, host->name, host->address);
5684 first_addr = prepare_addresses(addrlist, host);
5685 rc = smtp_deliver(addrlist, thost, host_af, defport, interface, tblock,
5686 &message_defer, TRUE);
5687 if (rc == DEFER && first_addr->basic_errno != ERRNO_AUTHFAIL)
5688 write_logs(host, first_addr->message, first_addr->basic_errno);
5689 # ifndef DISABLE_EVENT
5691 deferred_event_raise(first_addr, host, US"msg:host:defer");
5694 #endif /*DISABLE_TLS*/
5696 #ifndef DISABLE_EVENT
5697 /* If the last host gave a defer raise a per-message event */
5700 && unexpired_hosts_tried < ob->hosts_max_try
5701 && total_hosts_tried < ob->hosts_max_try_hardlimit
5703 && (message_defer || rc == DEFER)
5705 deferred_event_raise(first_addr, host, US"msg:defer");
5709 /* Delivery attempt finished */
5711 set_process_info("delivering %s: just tried %s [%s]%s for %s%s: result %s",
5712 message_id, host->name, host->address, pistring, addrlist->address,
5713 addrlist->next ? " (& others)" : "", rc_to_string(rc));
5715 /* Release serialization if set up */
5717 if (serialize_key) enq_end(serialize_key);
5719 /* If the result is DEFER, or if a host retry record is known to exist, we
5720 need to add an item to the retry chain for updating the retry database
5721 at the end of delivery. We only need to add the item to the top address,
5722 of course. Also, if DEFER, we mark the IP address unusable so as to skip it
5723 for any other delivery attempts using the same address. (It is copied into
5724 the unusable tree at the outer level, so even if different address blocks
5725 contain the same address, it still won't get tried again.) */
5727 if (rc == DEFER || retry_host_key)
5729 int delete_flag = rc != DEFER ? rf_delete : 0;
5730 if (!retry_host_key)
5733 if (exp_bool(addrlist, US"transport", tblock->name, D_transport,
5734 US"retry_include_ip_address", ob->retry_include_ip_address,
5735 ob->expand_retry_include_ip_address, &incl_ip) != OK)
5736 incl_ip = TRUE; /* error; use most-specific retry record */
5738 retry_host_key = incl_ip
5739 ? string_sprintf("T:%S:%s%s", host->name, host->address, pistring)
5740 : string_sprintf("T:%S%s", host->name, pistring);
5743 /* If a delivery of another message over an existing SMTP connection
5744 yields DEFER, we do NOT set up retry data for the host. This covers the
5745 case when there are delays in routing the addresses in the second message
5746 that are so long that the server times out. This is alleviated by not
5747 routing addresses that previously had routing defers when handling an
5748 existing connection, but even so, this case may occur (e.g. if a
5749 previously happily routed address starts giving routing defers). If the
5750 host is genuinely down, another non-continued message delivery will
5751 notice it soon enough. */
5753 if (delete_flag != 0 || !continue_hostname)
5754 retry_add_item(first_addr, retry_host_key, rf_host | delete_flag);
5756 /* We may have tried an expired host, if its retry time has come; ensure
5757 the status reflects the expiry for the benefit of any other addresses. */
5761 host->status = host_is_expired
5762 ? hstatus_unusable_expired : hstatus_unusable;
5763 host->why = hwhy_deferred;
5767 /* If message_defer is set (host was OK, but every recipient got deferred
5768 because of some message-specific problem), or if that had happened
5769 previously so that a message retry key exists, add an appropriate item
5770 to the retry chain. Note that if there was a message defer but now there is
5771 a host defer, the message defer record gets deleted. That seems perfectly
5772 reasonable. Also, stop the message from being remembered as waiting
5773 for specific hosts. */
5775 if (message_defer || retry_message_key)
5777 int delete_flag = message_defer ? 0 : rf_delete;
5778 if (!retry_message_key)
5781 if (exp_bool(addrlist, US"transport", tblock->name, D_transport,
5782 US"retry_include_ip_address", ob->retry_include_ip_address,
5783 ob->expand_retry_include_ip_address, &incl_ip) != OK)
5784 incl_ip = TRUE; /* error; use most-specific retry record */
5786 retry_message_key = incl_ip
5787 ? string_sprintf("T:%S:%s%s:%s", host->name, host->address, pistring,
5789 : string_sprintf("T:%S%s:%s", host->name, pistring, message_id);
5791 retry_add_item(addrlist, retry_message_key,
5792 rf_message | rf_host | delete_flag);
5793 update_waiting = FALSE;
5796 /* Any return other than DEFER (that is, OK or ERROR) means that the
5797 addresses have got their final statuses filled in for this host. In the OK
5798 case, see if any of them are deferred. */
5801 for (address_item * addr = addrlist; addr; addr = addr->next)
5802 if (addr->transport_return == DEFER)
5804 some_deferred = TRUE;
5808 /* If no addresses deferred or the result was ERROR, return. We do this for
5809 ERROR because a failing filter set-up or add_headers expansion is likely to
5810 fail for any host we try. */
5812 if (rc == ERROR || (rc == OK && !some_deferred))
5814 DEBUG(D_transport) debug_printf("Leaving %s transport\n", tblock->name);
5815 return TRUE; /* Each address has its status */
5818 /* If the result was DEFER or some individual addresses deferred, let
5819 the loop run to try other hosts with the deferred addresses, except for the
5820 case when we were trying to deliver down an existing channel and failed.
5821 Don't try any other hosts in this case. */
5823 if (continue_hostname) break;
5825 /* If the whole delivery, or some individual addresses, were deferred and
5826 there are more hosts that could be tried, do not count this host towards
5827 the hosts_max_try limit if the age of the message is greater than the
5828 maximum retry time for this host. This means we may try try all hosts,
5829 ignoring the limit, when messages have been around for some time. This is
5830 important because if we don't try all hosts, the address will never time
5831 out. NOTE: this does not apply to hosts_max_try_hardlimit. */
5833 if ((rc == DEFER || some_deferred) && nexthost)
5836 retry_config *retry = retry_find_config(host->name, NULL, 0, 0);
5838 if (retry && retry->rules)
5840 retry_rule *last_rule;
5841 for (last_rule = retry->rules;
5843 last_rule = last_rule->next);
5844 timedout = time(NULL) - received_time.tv_sec > last_rule->timeout;
5846 else timedout = TRUE; /* No rule => timed out */
5850 unexpired_hosts_tried--;
5851 DEBUG(D_transport) debug_printf("temporary delivery error(s) override "
5852 "hosts_max_try (message older than host's retry time)\n");
5858 if (unexpired_hosts_tried >= ob->hosts_max_try)
5859 debug_printf("reached transport hosts_max_try limit %d\n",
5861 if (total_hosts_tried >= ob->hosts_max_try_hardlimit)
5862 debug_printf("reached transport hosts_max_try_hardlimit limit %d\n",
5863 ob->hosts_max_try_hardlimit);
5866 testharness_pause_ms(500); /* let server debug out */
5867 } /* End of loop for trying multiple hosts. */
5869 /* If we failed to find a matching host in the list, for an already-open
5870 connection, just close it and start over with the list. This can happen
5871 for routing that changes from run to run, or big multi-IP sites with
5874 if (continue_hostname && !continue_host_tried)
5876 int fd = cutthrough.cctx.sock >= 0 ? cutthrough.cctx.sock : 0;
5878 DEBUG(D_transport) debug_printf("no hosts match already-open connection\n");
5880 /* A TLS conn could be open for a cutthrough, but not for a plain continued-
5882 /*XXX doublecheck that! */
5884 if (cutthrough.cctx.sock >= 0 && cutthrough.is_tls)
5886 (void) tls_write(cutthrough.cctx.tls_ctx, US"QUIT\r\n", 6, FALSE);
5887 tls_close(cutthrough.cctx.tls_ctx, TLS_SHUTDOWN_NOWAIT);
5888 cutthrough.cctx.tls_ctx = NULL;
5889 cutthrough.is_tls = FALSE;
5893 (void) write(fd, US"QUIT\r\n", 6);
5896 cutthrough.cctx.sock = -1;
5897 continue_hostname = NULL;
5898 goto retry_non_continued;
5901 /* This is the end of the loop that repeats iff expired is TRUE and
5902 ob->delay_after_cutoff is FALSE. The second time round we will
5903 try those hosts that haven't been tried since the message arrived. */
5907 debug_printf("all IP addresses skipped or deferred at least one address\n");
5908 if (expired && !ob->delay_after_cutoff && cutoff_retry == 0)
5909 debug_printf("retrying IP addresses not tried since message arrived\n");
5914 /* Get here if all IP addresses are skipped or defer at least one address. In
5915 MUA wrapper mode, this will happen only for connection or other non-message-
5916 specific failures. Force the delivery status for all addresses to FAIL. */
5920 for (address_item * addr = addrlist; addr; addr = addr->next)
5921 addr->transport_return = FAIL;
5925 /* In the normal, non-wrapper case, add a standard message to each deferred
5926 address if there hasn't been an error, that is, if it hasn't actually been
5927 tried this time. The variable "expired" will be FALSE if any deliveries were
5928 actually tried, or if there was at least one host that was not expired. That
5929 is, it is TRUE only if no deliveries were tried and all hosts were expired. If
5930 a delivery has been tried, an error code will be set, and the failing of the
5931 message is handled by the retry code later.
5933 If queue_smtp is set, or this transport was called to send a subsequent message
5934 down an existing TCP/IP connection, and something caused the host not to be
5935 found, we end up here, but can detect these cases and handle them specially. */
5937 for (address_item * addr = addrlist; addr; addr = addr->next)
5939 /* If host is not NULL, it means that we stopped processing the host list
5940 because of hosts_max_try or hosts_max_try_hardlimit. In the former case, this
5941 means we need to behave as if some hosts were skipped because their retry
5942 time had not come. Specifically, this prevents the address from timing out.
5943 However, if we have hit hosts_max_try_hardlimit, we want to behave as if all
5944 hosts were tried. */
5947 if (total_hosts_tried >= ob->hosts_max_try_hardlimit)
5950 debug_printf("hosts_max_try_hardlimit reached: behave as if all "
5951 "hosts were tried\n");
5956 debug_printf("hosts_max_try limit caused some hosts to be skipped\n");
5957 setflag(addr, af_retry_skipped);
5960 if (f.queue_smtp) /* no deliveries attempted */
5962 addr->transport_return = DEFER;
5963 addr->basic_errno = 0;
5964 addr->message = US"SMTP delivery explicitly queued";
5967 else if ( addr->transport_return == DEFER
5968 && (addr->basic_errno == ERRNO_UNKNOWNERROR || addr->basic_errno == 0)
5972 addr->basic_errno = ERRNO_HRETRY;
5973 if (continue_hostname)
5974 addr->message = US"no host found for existing SMTP connection";
5977 setflag(addr, af_pass_message); /* This is not a security risk */
5978 addr->message = string_sprintf(
5979 "all hosts%s have been failing for a long time %s",
5980 addr->domain ? string_sprintf(" for '%s'", addr->domain) : US"",
5981 ob->delay_after_cutoff
5982 ? US"(and retry time not reached)"
5983 : US"and were last tried after this message arrived");
5985 /* If we are already using fallback hosts, or there are no fallback hosts
5986 defined, convert the result to FAIL to cause a bounce. */
5988 if (addr->host_list == addr->fallback_hosts || !addr->fallback_hosts)
5989 addr->transport_return = FAIL;
5994 if (hosts_retry == hosts_total)
5995 s = "retry time not reached for any host%s";
5996 else if (hosts_fail == hosts_total)
5997 s = "all host address lookups%s failed permanently";
5998 else if (hosts_defer == hosts_total)
5999 s = "all host address lookups%s failed temporarily";
6000 else if (hosts_serial == hosts_total)
6001 s = "connection limit reached for all hosts%s";
6002 else if (hosts_fail+hosts_defer == hosts_total)
6003 s = "all host address lookups%s failed";
6005 s = "some host address lookups failed and retry time "
6006 "not reached for other hosts or connection limit reached%s";
6008 addr->message = string_sprintf(s,
6009 addr->domain ? string_sprintf(" for '%s'", addr->domain) : US"");
6014 /* Update the database which keeps information about which messages are waiting
6015 for which hosts to become available. For some message-specific errors, the
6016 update_waiting flag is turned off because we don't want follow-on deliveries in
6017 those cases. If this transport instance is explicitly limited to one message
6018 per connection then follow-on deliveries are not possible and there's no need
6019 to create/update the per-transport wait-<transport_name> database. */
6021 if (update_waiting && tblock->connection_max_messages != 1)
6022 transport_update_waiting(hostlist, tblock->name);
6026 DEBUG(D_transport) debug_printf("Leaving %s transport\n", tblock->name);
6028 return TRUE; /* Each address has its status */
6031 #endif /*!MACRO_PREDEF*/
6034 /* End of transport/smtp.c */