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))
683 deliver_localpart = save_local;
684 deliver_domain = save_domain;
685 router_name = transport_name = NULL;
689 /*************************************************
690 * Reap SMTP specific responses *
691 *************************************************/
693 smtp_discard_responses(smtp_context * sx, smtp_transport_options_block * ob,
696 uschar flushbuffer[4096];
700 if (!smtp_read_response(sx, flushbuffer, sizeof(flushbuffer),
701 '2', ob->command_timeout)
702 && (errno != 0 || flushbuffer[0] == 0))
709 /* Return boolean success */
712 smtp_reap_banner(smtp_context * sx)
715 #if defined(__linux__) && defined(TCP_QUICKACK)
716 { /* Hack to get QUICKACK disabled; has to be right after 3whs, and has to on->off */
717 int sock = sx->cctx.sock;
718 struct pollfd p = {.fd = sock, .events = POLLOUT};
719 if (poll(&p, 1, 1000) >= 0) /* retval test solely for compiler quitening */
721 (void) setsockopt(sock, IPPROTO_TCP, TCP_QUICKACK, US &on, sizeof(on));
722 (void) setsockopt(sock, IPPROTO_TCP, TCP_QUICKACK, US &off, sizeof(off));
726 good_response = smtp_read_response(sx, sx->buffer, sizeof(sx->buffer),
727 '2', (SOB sx->conn_args.ob)->command_timeout);
728 #ifdef EXPERIMENTAL_DSN_INFO
729 sx->smtp_greeting = string_copy(sx->buffer);
731 return good_response;
735 smtp_reap_ehlo(smtp_context * sx)
737 if (!smtp_read_response(sx, sx->buffer, sizeof(sx->buffer), '2',
738 (SOB sx->conn_args.ob)->command_timeout))
740 if (errno != 0 || sx->buffer[0] == 0 || sx->lmtp)
742 #ifdef EXPERIMENTAL_DSN_INFO
743 sx->helo_response = string_copy(sx->buffer);
749 #ifdef EXPERIMENTAL_DSN_INFO
750 sx->helo_response = string_copy(sx->buffer);
752 #ifndef DISABLE_EVENT
753 (void) event_raise(sx->conn_args.tblock->event_action,
754 US"smtp:ehlo", sx->buffer);
760 /******************************************************************************/
762 #ifdef EXPERIMENTAL_ESMTP_LIMITS
763 /* If TLS, or TLS not offered, called with the EHLO response in the buffer.
764 Check it for a LIMITS keyword and parse values into the smtp context structure.
766 We don't bother with peers that we won't talk TLS to, even though they can,
767 just ignore their LIMITS advice (if any) and treat them as if they do not.
768 This saves us dealing with a duplicate set of values. */
771 ehlo_response_limits_read(smtp_context * sx)
775 /* matches up to just after the first space after the keyword */
777 if (regex_match(regex_LIMITS, sx->buffer, -1, &match))
778 for (const uschar * s = sx->buffer + Ustrlen(match); *s; )
780 while (isspace(*s)) s++;
781 if (*s == '\n') break;
783 if (strncmpic(s, US"MAILMAX=", 8) == 0)
785 sx->peer_limit_mail = atoi(CS (s += 8));
786 while (isdigit(*s)) s++;
788 else if (strncmpic(s, US"RCPTMAX=", 8) == 0)
790 sx->peer_limit_rcpt = atoi(CS (s += 8));
791 while (isdigit(*s)) s++;
793 else if (strncmpic(s, US"RCPTDOMAINMAX=", 14) == 0)
795 sx->peer_limit_rcptdom = atoi(CS (s += 14));
796 while (isdigit(*s)) s++;
799 while (*s && !isspace(*s)) s++;
803 /* Apply given values to the current connection */
805 ehlo_limits_apply(smtp_context * sx,
806 unsigned limit_mail, unsigned limit_rcpt, unsigned limit_rcptdom)
808 if (limit_mail && limit_mail < sx->max_mail) sx->max_mail = limit_mail;
809 if (limit_rcpt && limit_rcpt < sx->max_rcpt) sx->max_rcpt = limit_rcpt;
812 DEBUG(D_transport) debug_printf("will treat as !multi_domain\n");
813 sx->single_rcpt_domain = TRUE;
817 /* Apply values from EHLO-resp to the current connection */
819 ehlo_response_limits_apply(smtp_context * sx)
821 ehlo_limits_apply(sx, sx->peer_limit_mail, sx->peer_limit_rcpt,
822 sx->peer_limit_rcptdom);
825 /* Apply values read from cache to the current connection */
827 ehlo_cache_limits_apply(smtp_context * sx)
829 ehlo_limits_apply(sx, sx->ehlo_resp.limit_mail, sx->ehlo_resp.limit_rcpt,
830 sx->ehlo_resp.limit_rcptdom);
834 /******************************************************************************/
836 #ifndef DISABLE_PIPE_CONNECT
838 ehlo_cache_key(const smtp_context * sx)
840 host_item * host = sx->conn_args.host;
841 return Ustrchr(host->address, ':')
842 ? string_sprintf("[%s]:%d.EHLO", host->address,
843 host->port == PORT_NONE ? sx->port : host->port)
844 : string_sprintf("%s:%d.EHLO", host->address,
845 host->port == PORT_NONE ? sx->port : host->port);
848 /* Cache EHLO-response info for use by early-pipe.
850 - During a normal flow on EHLO response (either cleartext or under TLS),
851 when we are willing to do PIPECONNECT and it is offered
852 - During an early-pipe flow on receiving the actual EHLO response and noting
853 disparity versus the cached info used, when PIPECONNECT is still being offered
855 We assume that suitable values have been set in the sx.ehlo_resp structure for
856 features and auths; we handle the copy of limits. */
859 write_ehlo_cache_entry(smtp_context * sx)
861 open_db dbblock, * dbm_file;
863 #ifdef EXPERIMENTAL_ESMTP_LIMITS
864 sx->ehlo_resp.limit_mail = sx->peer_limit_mail;
865 sx->ehlo_resp.limit_rcpt = sx->peer_limit_rcpt;
866 sx->ehlo_resp.limit_rcptdom = sx->peer_limit_rcptdom;
869 if ((dbm_file = dbfn_open(US"misc", O_RDWR, &dbblock, TRUE, TRUE)))
871 uschar * ehlo_resp_key = ehlo_cache_key(sx);
872 dbdata_ehlo_resp er = { .data = sx->ehlo_resp };
875 #ifdef EXPERIMENTAL_ESMTP_LIMITS
876 if (sx->ehlo_resp.limit_mail || sx->ehlo_resp.limit_rcpt || sx->ehlo_resp.limit_rcptdom)
877 debug_printf("writing clr %04x/%04x cry %04x/%04x lim %05d/%05d/%05d\n",
878 sx->ehlo_resp.cleartext_features, sx->ehlo_resp.cleartext_auths,
879 sx->ehlo_resp.crypted_features, sx->ehlo_resp.crypted_auths,
880 sx->ehlo_resp.limit_mail, sx->ehlo_resp.limit_rcpt,
881 sx->ehlo_resp.limit_rcptdom);
884 debug_printf("writing clr %04x/%04x cry %04x/%04x\n",
885 sx->ehlo_resp.cleartext_features, sx->ehlo_resp.cleartext_auths,
886 sx->ehlo_resp.crypted_features, sx->ehlo_resp.crypted_auths);
888 dbfn_write(dbm_file, ehlo_resp_key, &er, (int)sizeof(er));
889 dbfn_close(dbm_file);
894 invalidate_ehlo_cache_entry(smtp_context * sx)
896 open_db dbblock, * dbm_file;
898 if ( sx->early_pipe_active
899 && (dbm_file = dbfn_open(US"misc", O_RDWR, &dbblock, TRUE, TRUE)))
901 uschar * ehlo_resp_key = ehlo_cache_key(sx);
902 dbfn_delete(dbm_file, ehlo_resp_key);
903 dbfn_close(dbm_file);
908 read_ehlo_cache_entry(smtp_context * sx)
913 if (!(dbm_file = dbfn_open(US"misc", O_RDONLY, &dbblock, FALSE, TRUE)))
914 { DEBUG(D_transport) debug_printf("ehlo-cache: no misc DB\n"); }
917 uschar * ehlo_resp_key = ehlo_cache_key(sx);
918 dbdata_ehlo_resp * er;
920 if (!(er = dbfn_read_enforce_length(dbm_file, ehlo_resp_key, sizeof(dbdata_ehlo_resp))))
921 { DEBUG(D_transport) debug_printf("no ehlo-resp record\n"); }
922 else if (time(NULL) - er->time_stamp > retry_data_expire)
924 DEBUG(D_transport) debug_printf("ehlo-resp record too old\n");
925 dbfn_close(dbm_file);
926 if ((dbm_file = dbfn_open(US"misc", O_RDWR, &dbblock, TRUE, TRUE)))
927 dbfn_delete(dbm_file, ehlo_resp_key);
932 #ifdef EXPERIMENTAL_ESMTP_LIMITS
933 if (er->data.limit_mail || er->data.limit_rcpt || er->data.limit_rcptdom)
934 debug_printf("EHLO response bits from cache:"
935 " cleartext 0x%04x/0x%04x crypted 0x%04x/0x%04x lim %05d/%05d/%05d\n",
936 er->data.cleartext_features, er->data.cleartext_auths,
937 er->data.crypted_features, er->data.crypted_auths,
938 er->data.limit_mail, er->data.limit_rcpt, er->data.limit_rcptdom);
941 debug_printf("EHLO response bits from cache:"
942 " cleartext 0x%04x/0x%04x crypted 0x%04x/0x%04x\n",
943 er->data.cleartext_features, er->data.cleartext_auths,
944 er->data.crypted_features, er->data.crypted_auths);
946 sx->ehlo_resp = er->data;
947 #ifdef EXPERIMENTAL_ESMTP_LIMITS
948 ehlo_cache_limits_apply(sx);
950 dbfn_close(dbm_file);
953 dbfn_close(dbm_file);
960 /* Return an auths bitmap for the set of AUTH methods offered by the server
961 which match our authenticators. */
963 static unsigned short
964 study_ehlo_auths(smtp_context * sx)
969 unsigned short authbits = 0;
971 if (!sx->esmtp) return 0;
972 if (!regex_AUTH) regex_AUTH = regex_must_compile(AUTHS_REGEX, FALSE, TRUE);
973 if (!regex_match_and_setup(regex_AUTH, sx->buffer, 0, -1)) return 0;
974 expand_nmax = -1; /* reset */
975 names = string_copyn(expand_nstring[1], expand_nlength[1]);
977 for (au = auths, authnum = 0; au; au = au->next, authnum++) if (au->client)
979 const uschar * list = names;
981 for (int sep = ' '; s = string_nextinlist(&list, &sep, NULL, 0); )
982 if (strcmpic(au->public_name, s) == 0)
983 { authbits |= BIT(authnum); break; }
987 debug_printf("server offers %s AUTH, methods '%s', bitmap 0x%04x\n",
988 tls_out.active.sock >= 0 ? "crypted" : "plaintext", names, authbits);
990 if (tls_out.active.sock >= 0)
991 sx->ehlo_resp.crypted_auths = authbits;
993 sx->ehlo_resp.cleartext_auths = authbits;
1000 /* Wait for and check responses for early-pipelining.
1002 Called from the lower-level smtp_read_response() function
1003 used for general code that assume synchronisation, if context
1004 flags indicate outstanding early-pipelining commands. Also
1005 called fom sync_responses() which handles pipelined commands.
1008 sx smtp connection context
1009 countp number of outstanding responses, adjusted on return
1013 DEFER error on first read of TLS'd conn
1014 FAIL SMTP error in response
1017 smtp_reap_early_pipe(smtp_context * sx, int * countp)
1019 BOOL pending_BANNER = sx->pending_BANNER;
1020 BOOL pending_EHLO = sx->pending_EHLO;
1023 sx->pending_BANNER = FALSE; /* clear early to avoid recursion */
1024 sx->pending_EHLO = FALSE;
1028 DEBUG(D_transport) debug_printf("%s expect banner\n", __FUNCTION__);
1030 if (!smtp_reap_banner(sx))
1032 DEBUG(D_transport) debug_printf("bad banner\n");
1033 if (tls_out.active.sock >= 0) rc = DEFER;
1040 unsigned peer_offered;
1041 unsigned short authbits = 0, * ap;
1043 DEBUG(D_transport) debug_printf("%s expect ehlo\n", __FUNCTION__);
1045 if (!smtp_reap_ehlo(sx))
1047 DEBUG(D_transport) debug_printf("bad response for EHLO\n");
1048 if (tls_out.active.sock >= 0) rc = DEFER;
1052 /* Compare the actual EHLO response extensions and AUTH methods to the cached
1053 value we assumed; on difference, dump or rewrite the cache and arrange for a
1056 ap = tls_out.active.sock < 0
1057 ? &sx->ehlo_resp.cleartext_auths : &sx->ehlo_resp.crypted_auths;
1059 peer_offered = ehlo_response(sx->buffer,
1060 (tls_out.active.sock < 0 ? OPTION_TLS : 0)
1061 | OPTION_CHUNKING | OPTION_PRDR | OPTION_DSN | OPTION_PIPE | OPTION_SIZE
1062 | OPTION_UTF8 | OPTION_EARLY_PIPE
1064 #ifdef EXPERIMENTAL_ESMTP_LIMITS
1065 if (tls_out.active.sock >= 0 || !(peer_offered & OPTION_TLS))
1066 ehlo_response_limits_read(sx);
1068 if ( peer_offered != sx->peer_offered
1069 || (authbits = study_ehlo_auths(sx)) != *ap)
1072 debug_printf("EHLO %s extensions changed, 0x%04x/0x%04x -> 0x%04x/0x%04x\n",
1073 tls_out.active.sock < 0 ? "cleartext" : "crypted",
1074 sx->peer_offered, *ap, peer_offered, authbits);
1075 if (peer_offered & OPTION_EARLY_PIPE)
1077 *(tls_out.active.sock < 0
1078 ? &sx->ehlo_resp.cleartext_features : &sx->ehlo_resp.crypted_features) =
1081 write_ehlo_cache_entry(sx);
1084 invalidate_ehlo_cache_entry(sx);
1086 return OK; /* just carry on */
1088 #ifdef EXPERIMENTAL_ESMTP_LIMITS
1089 /* If we are handling LIMITS, compare the actual EHLO LIMITS values with the
1090 cached values and invalidate cache if different. OK to carry on with
1091 connect since values are advisory. */
1093 if ( (tls_out.active.sock >= 0 || !(peer_offered & OPTION_TLS))
1094 && ( sx->peer_limit_mail != sx->ehlo_resp.limit_mail
1095 || sx->peer_limit_rcpt != sx->ehlo_resp.limit_rcpt
1096 || sx->peer_limit_rcptdom != sx->ehlo_resp.limit_rcptdom
1101 debug_printf("EHLO LIMITS changed:");
1102 if (sx->peer_limit_mail != sx->ehlo_resp.limit_mail)
1103 debug_printf(" MAILMAX %u -> %u\n", sx->ehlo_resp.limit_mail, sx->peer_limit_mail);
1104 else if (sx->peer_limit_rcpt != sx->ehlo_resp.limit_rcpt)
1105 debug_printf(" RCPTMAX %u -> %u\n", sx->ehlo_resp.limit_rcpt, sx->peer_limit_rcpt);
1107 debug_printf(" RCPTDOMAINMAX %u -> %u\n", sx->ehlo_resp.limit_rcptdom, sx->peer_limit_rcptdom);
1109 invalidate_ehlo_cache_entry(sx);
1117 invalidate_ehlo_cache_entry(sx);
1118 (void) smtp_discard_responses(sx, sx->conn_args.ob, *countp);
1121 #endif /*!DISABLE_PIPE_CONNECT*/
1124 /*************************************************
1125 * Synchronize SMTP responses *
1126 *************************************************/
1128 /* This function is called from smtp_deliver() to receive SMTP responses from
1129 the server, and match them up with the commands to which they relate. When
1130 PIPELINING is not in use, this function is called after every command, and is
1131 therefore somewhat over-engineered, but it is simpler to use a single scheme
1132 that works both with and without PIPELINING instead of having two separate sets
1135 The set of commands that are buffered up with pipelining may start with MAIL
1136 and may end with DATA; in between are RCPT commands that correspond to the
1137 addresses whose status is PENDING_DEFER. All other commands (STARTTLS, AUTH,
1138 etc.) are never buffered.
1140 Errors after MAIL or DATA abort the whole process leaving the response in the
1141 buffer. After MAIL, pending responses are flushed, and the original command is
1142 re-instated in big_buffer for error messages. For RCPT commands, the remote is
1143 permitted to reject some recipient addresses while accepting others. However
1144 certain errors clearly abort the whole process. Set the value in
1145 transport_return to PENDING_OK if the address is accepted. If there is a
1146 subsequent general error, it will get reset accordingly. If not, it will get
1147 converted to OK at the end.
1150 sx smtp connection context
1151 count the number of responses to read
1152 pending_DATA 0 if last command sent was not DATA
1153 +1 if previously had a good recipient
1154 -1 if not previously had a good recipient
1156 Returns: 3 if at least one address had 2xx and one had 5xx
1157 2 if at least one address had 5xx but none had 2xx
1158 1 if at least one host had a 2xx response, but none had 5xx
1159 0 no address had 2xx or 5xx but no errors (all 4xx, or just DATA)
1160 -1 timeout while reading RCPT response
1161 -2 I/O or other non-response error for RCPT
1162 -3 DATA or MAIL failed - errno and buffer set
1163 -4 banner or EHLO failed (early-pipelining)
1164 -5 banner or EHLO failed (early-pipelining, TLS)
1168 sync_responses(smtp_context * sx, int count, int pending_DATA)
1170 address_item * addr = sx->sync_addr;
1171 smtp_transport_options_block * ob = sx->conn_args.ob;
1174 #ifndef DISABLE_PIPE_CONNECT
1176 if ((rc = smtp_reap_early_pipe(sx, &count)) != OK)
1177 return rc == FAIL ? -4 : -5;
1180 /* Handle the response for a MAIL command. On error, reinstate the original
1181 command in big_buffer for error message use, and flush any further pending
1182 responses before returning, except after I/O errors and timeouts. */
1184 if (sx->pending_MAIL)
1186 DEBUG(D_transport) debug_printf("%s expect mail\n", __FUNCTION__);
1188 sx->pending_MAIL = sx->RCPT_452 = FALSE;
1189 if (!smtp_read_response(sx, sx->buffer, sizeof(sx->buffer),
1190 '2', ob->command_timeout))
1192 DEBUG(D_transport) debug_printf("bad response for MAIL\n");
1193 Ustrcpy(big_buffer, mail_command); /* Fits, because it came from there! */
1194 if (errno == ERRNO_TLSFAILURE)
1196 if (errno == 0 && sx->buffer[0] != 0)
1199 if (sx->buffer[0] == '4')
1201 save_errno = ERRNO_MAIL4XX;
1202 addr->more_errno |= ((sx->buffer[1] - '0')*10 + sx->buffer[2] - '0') << 8;
1204 count = smtp_discard_responses(sx, ob, count);
1208 if (pending_DATA) count--; /* Number of RCPT responses to come */
1209 while (count-- > 0) /* Mark any pending addrs with the host used */
1211 while (addr->transport_return != PENDING_DEFER) addr = addr->next;
1212 addr->host_used = sx->conn_args.host;
1219 if (pending_DATA) count--; /* Number of RCPT responses to come */
1221 /* Read and handle the required number of RCPT responses, matching each one up
1222 with an address by scanning for the next address whose status is PENDING_DEFER.
1227 while (addr->transport_return != PENDING_DEFER)
1228 if (!(addr = addr->next))
1231 /* The address was accepted */
1232 addr->host_used = sx->conn_args.host;
1234 DEBUG(D_transport) debug_printf("%s expect rcpt for %s\n", __FUNCTION__, addr->address);
1235 if (smtp_read_response(sx, sx->buffer, sizeof(sx->buffer),
1236 '2', ob->command_timeout))
1239 addr->transport_return = PENDING_OK;
1241 /* If af_dr_retry_exists is set, there was a routing delay on this address;
1242 ensure that any address-specific retry record is expunged. We do this both
1243 for the basic key and for the version that also includes the sender. */
1245 if (testflag(addr, af_dr_retry_exists))
1247 uschar *altkey = string_sprintf("%s:<%s>", addr->address_retry_key,
1249 retry_add_item(addr, altkey, rf_delete);
1250 retry_add_item(addr, addr->address_retry_key, rf_delete);
1254 /* Error on first TLS read */
1256 else if (errno == ERRNO_TLSFAILURE)
1259 /* Timeout while reading the response */
1261 else if (errno == ETIMEDOUT)
1263 uschar *message = string_sprintf("SMTP timeout after RCPT TO:<%s>",
1264 transport_rcpt_address(addr, sx->conn_args.tblock->rcpt_include_affixes));
1265 set_errno_nohost(sx->first_addr, ETIMEDOUT, message, DEFER, FALSE, &sx->delivery_start);
1266 retry_add_item(addr, addr->address_retry_key, 0);
1267 update_waiting = FALSE;
1271 /* Handle other errors in obtaining an SMTP response by returning -1. This
1272 will cause all the addresses to be deferred. Restore the SMTP command in
1273 big_buffer for which we are checking the response, so the error message
1276 else if (errno != 0 || sx->buffer[0] == 0)
1278 gstring gs = { .size = big_buffer_size, .ptr = 0, .s = big_buffer }, * g = &gs;
1280 /* Use taint-unchecked routines for writing into big_buffer, trusting
1281 that we'll never expand it. */
1283 g = string_fmt_append_f(g, SVFMT_TAINT_NOCHK, "RCPT TO:<%s>",
1284 transport_rcpt_address(addr, sx->conn_args.tblock->rcpt_include_affixes));
1285 string_from_gstring(g);
1289 /* Handle SMTP permanent and temporary response codes. */
1294 string_sprintf("SMTP error from remote mail server after RCPT TO:<%s>: "
1295 "%s", transport_rcpt_address(addr, sx->conn_args.tblock->rcpt_include_affixes),
1296 string_printing(sx->buffer));
1297 setflag(addr, af_pass_message);
1299 msglog_line(sx->conn_args.host, addr->message);
1301 /* The response was 5xx */
1303 if (sx->buffer[0] == '5')
1305 addr->transport_return = FAIL;
1309 /* The response was 4xx */
1313 addr->transport_return = DEFER;
1314 addr->basic_errno = ERRNO_RCPT4XX;
1315 addr->more_errno |= ((sx->buffer[1] - '0')*10 + sx->buffer[2] - '0') << 8;
1319 #ifndef DISABLE_EVENT
1320 event_defer_errno = addr->more_errno;
1321 msg_event_raise(US"msg:rcpt:host:defer", addr);
1323 /* If a 452 and we've had at least one 2xx or 5xx, set next_addr to the
1324 start point for another MAIL command. */
1326 if (addr->more_errno >> 8 == 52 && yield & 3)
1328 if (!sx->RCPT_452) /* initialised at MAIL-ack above */
1331 debug_printf("%s: seen first 452 too-many-rcpts\n", __FUNCTION__);
1332 sx->RCPT_452 = TRUE;
1333 sx->next_addr = addr;
1335 addr->transport_return = PENDING_DEFER;
1336 addr->basic_errno = 0;
1340 /* Log temporary errors if there are more hosts to be tried.
1341 If not, log this last one in the == line. */
1343 if (sx->conn_args.host->next)
1344 if (LOGGING(outgoing_port))
1345 log_write(0, LOG_MAIN, "H=%s [%s]:%d %s", sx->conn_args.host->name,
1346 sx->conn_args.host->address,
1347 sx->port == PORT_NONE ? 25 : sx->port, addr->message);
1349 log_write(0, LOG_MAIN, "H=%s [%s]: %s", sx->conn_args.host->name,
1350 sx->conn_args.host->address, addr->message);
1352 #ifndef DISABLE_EVENT
1354 msg_event_raise(US"msg:rcpt:defer", addr);
1357 /* Do not put this message on the list of those waiting for specific
1358 hosts, as otherwise it is likely to be tried too often. */
1360 update_waiting = FALSE;
1362 /* Add a retry item for the address so that it doesn't get tried again
1363 too soon. If address_retry_include_sender is true, add the sender address
1364 to the retry key. */
1366 retry_add_item(addr,
1367 ob->address_retry_include_sender
1368 ? string_sprintf("%s:<%s>", addr->address_retry_key, sender_address)
1369 : addr->address_retry_key,
1375 if (count && !(addr = addr->next))
1377 } /* Loop for next RCPT response */
1379 /* Update where to start at for the next block of responses, unless we
1380 have already handled all the addresses. */
1382 if (addr) sx->sync_addr = addr->next;
1384 /* Handle a response to DATA. If we have not had any good recipients, either
1385 previously or in this block, the response is ignored. */
1387 if (pending_DATA != 0)
1389 DEBUG(D_transport) debug_printf("%s expect data\n", __FUNCTION__);
1390 if (!smtp_read_response(sx, sx->buffer, sizeof(sx->buffer),
1391 '3', ob->command_timeout))
1397 if (errno == ERRNO_TLSFAILURE) /* Error on first TLS read */
1400 if (pending_DATA > 0 || (yield & 1) != 0)
1402 if (errno == 0 && sx->buffer[0] == '4')
1404 errno = ERRNO_DATA4XX;
1405 sx->first_addr->more_errno |= ((sx->buffer[1] - '0')*10 + sx->buffer[2] - '0') << 8;
1409 (void)check_response(sx->conn_args.host, &errno, 0, sx->buffer, &code, &msg, &pass_message);
1410 DEBUG(D_transport) debug_printf("%s\nerror for DATA ignored: pipelining "
1411 "is in use and there were no good recipients\n", msg);
1415 /* All responses read and handled; MAIL (if present) received 2xx and DATA (if
1416 present) received 3xx. If any RCPTs were handled and yielded anything other
1417 than 4xx, yield will be set non-zero. */
1426 /* Try an authenticator's client entry */
1429 try_authenticator(smtp_context * sx, auth_instance * au)
1431 smtp_transport_options_block * ob = sx->conn_args.ob; /* transport options */
1432 host_item * host = sx->conn_args.host; /* host to deliver to */
1435 sx->outblock.authenticating = TRUE;
1436 rc = (au->info->clientcode)(au, sx, ob->command_timeout,
1437 sx->buffer, sizeof(sx->buffer));
1438 sx->outblock.authenticating = FALSE;
1439 DEBUG(D_transport) debug_printf("%s authenticator yielded %d\n", au->name, rc);
1441 /* A temporary authentication failure must hold up delivery to
1442 this host. After a permanent authentication failure, we carry on
1443 to try other authentication methods. If all fail hard, try to
1444 deliver the message unauthenticated unless require_auth was set. */
1449 f.smtp_authenticated = TRUE; /* stops the outer loop */
1450 client_authenticator = au->name;
1451 if (au->set_client_id)
1452 client_authenticated_id = expand_string(au->set_client_id);
1455 /* Failure after writing a command */
1460 /* Failure after reading a response */
1463 if (errno != 0 || sx->buffer[0] != '5') return FAIL;
1464 log_write(0, LOG_MAIN, "%s authenticator failed H=%s [%s] %s",
1465 au->name, host->name, host->address, sx->buffer);
1468 /* Failure by some other means. In effect, the authenticator
1469 decided it wasn't prepared to handle this case. Typically this
1470 is the result of "fail" in an expansion string. Do we need to
1471 log anything here? Feb 2006: a message is now put in the buffer
1472 if logging is required. */
1475 if (*sx->buffer != 0)
1476 log_write(0, LOG_MAIN, "%s authenticator cancelled "
1477 "authentication H=%s [%s] %s", au->name, host->name,
1478 host->address, sx->buffer);
1481 /* Internal problem, message in buffer. */
1484 set_errno_nohost(sx->addrlist, ERRNO_AUTHPROB, string_copy(sx->buffer),
1485 DEFER, FALSE, &sx->delivery_start);
1494 /* Do the client side of smtp-level authentication.
1497 sx smtp connection context
1499 sx->buffer should have the EHLO response from server (gets overwritten)
1502 OK Success, or failed (but not required): global "smtp_authenticated" set
1503 DEFER Failed authentication (and was required)
1504 ERROR Internal problem
1506 FAIL_SEND Failed communications - transmit
1511 smtp_auth(smtp_context * sx)
1513 host_item * host = sx->conn_args.host; /* host to deliver to */
1514 smtp_transport_options_block * ob = sx->conn_args.ob; /* transport options */
1515 int require_auth = verify_check_given_host(CUSS &ob->hosts_require_auth, host);
1516 #ifndef DISABLE_PIPE_CONNECT
1517 unsigned short authbits = tls_out.active.sock >= 0
1518 ? sx->ehlo_resp.crypted_auths : sx->ehlo_resp.cleartext_auths;
1520 uschar * fail_reason = US"server did not advertise AUTH support";
1522 f.smtp_authenticated = FALSE;
1523 client_authenticator = client_authenticated_id = client_authenticated_sender = NULL;
1526 regex_AUTH = regex_must_compile(AUTHS_REGEX, FALSE, TRUE);
1528 /* Is the server offering AUTH? */
1532 #ifndef DISABLE_PIPE_CONNECT
1533 sx->early_pipe_active ? authbits
1536 regex_match_and_setup(regex_AUTH, sx->buffer, 0, -1)
1539 uschar * names = NULL;
1540 expand_nmax = -1; /* reset */
1542 #ifndef DISABLE_PIPE_CONNECT
1543 if (!sx->early_pipe_active)
1545 names = string_copyn(expand_nstring[1], expand_nlength[1]);
1547 /* Must not do this check until after we have saved the result of the
1548 regex match above as the check could be another RE. */
1550 if ( require_auth == OK
1551 || verify_check_given_host(CUSS &ob->hosts_try_auth, host) == OK)
1553 DEBUG(D_transport) debug_printf("scanning authentication mechanisms\n");
1554 fail_reason = US"no common mechanisms were found";
1556 #ifndef DISABLE_PIPE_CONNECT
1557 if (sx->early_pipe_active)
1559 /* Scan our authenticators (which support use by a client and were offered
1560 by the server (checked at cache-write time)), not suppressed by
1561 client_condition. If one is found, attempt to authenticate by calling its
1562 client function. We are limited to supporting up to 16 authenticator
1563 public-names by the number of bits in a short. */
1569 for (bitnum = 0, au = auths;
1570 !f.smtp_authenticated && au && bitnum < 16;
1571 bitnum++, au = au->next) if (authbits & BIT(bitnum))
1573 if ( au->client_condition
1574 && !expand_check_condition(au->client_condition, au->name,
1575 US"client authenticator"))
1577 DEBUG(D_transport) debug_printf("skipping %s authenticator: %s\n",
1578 au->name, "client_condition is false");
1582 /* Found data for a listed mechanism. Call its client entry. Set
1583 a flag in the outblock so that data is overwritten after sending so
1584 that reflections don't show it. */
1586 fail_reason = US"authentication attempt(s) failed";
1588 if ((rc = try_authenticator(sx, au)) != OK)
1595 /* Scan the configured authenticators looking for one which is configured
1596 for use as a client, which is not suppressed by client_condition, and
1597 whose name matches an authentication mechanism supported by the server.
1598 If one is found, attempt to authenticate by calling its client function.
1601 for (auth_instance * au = auths; !f.smtp_authenticated && au; au = au->next)
1606 || ( au->client_condition
1607 && !expand_check_condition(au->client_condition, au->name,
1608 US"client authenticator")))
1610 DEBUG(D_transport) debug_printf("skipping %s authenticator: %s\n",
1612 (au->client)? "client_condition is false" :
1613 "not configured as a client");
1617 /* Loop to scan supported server mechanisms */
1621 int len = Ustrlen(au->public_name);
1624 while (isspace(*p)) p++;
1626 if (strncmpic(au->public_name, p, len) != 0 ||
1627 (p[len] != 0 && !isspace(p[len])))
1629 while (*p != 0 && !isspace(*p)) p++;
1633 /* Found data for a listed mechanism. Call its client entry. Set
1634 a flag in the outblock so that data is overwritten after sending so
1635 that reflections don't show it. */
1637 fail_reason = US"authentication attempt(s) failed";
1639 if ((rc = try_authenticator(sx, au)) != OK)
1642 break; /* If not authenticated, try next authenticator */
1643 } /* Loop for scanning supported server mechanisms */
1644 } /* Loop for further authenticators */
1648 /* If we haven't authenticated, but are required to, give up. */
1650 if (require_auth == OK && !f.smtp_authenticated)
1652 #ifndef DISABLE_PIPE_CONNECT
1653 invalidate_ehlo_cache_entry(sx);
1655 set_errno_nohost(sx->addrlist, ERRNO_AUTHFAIL,
1656 string_sprintf("authentication required but %s", fail_reason), DEFER,
1657 FALSE, &sx->delivery_start);
1665 /* Construct AUTH appendix string for MAIL TO */
1668 sx context for smtp connection
1669 p point in sx->buffer to build string
1670 addrlist chain of potential addresses to deliver
1672 Globals f.smtp_authenticated
1673 client_authenticated_sender
1674 Return True on error, otherwise buffer has (possibly empty) terminated string
1678 smtp_mail_auth_str(smtp_context * sx, uschar * p, address_item * addrlist)
1680 smtp_transport_options_block * ob = sx->conn_args.ob;
1681 uschar * local_authenticated_sender = authenticated_sender;
1684 debug_printf("smtp_mail_auth_str: as<%s> os<%s> SA<%s>\n",
1685 authenticated_sender, ob->authenticated_sender, f.smtp_authenticated?"Y":"N");
1688 if (ob->authenticated_sender)
1690 uschar * new = expand_string(ob->authenticated_sender);
1693 if (!f.expand_string_forcedfail)
1695 uschar *message = string_sprintf("failed to expand "
1696 "authenticated_sender: %s", expand_string_message);
1697 set_errno_nohost(addrlist, ERRNO_EXPANDFAIL, message, DEFER, FALSE, &sx->delivery_start);
1702 local_authenticated_sender = new;
1705 /* Add the authenticated sender address if present */
1707 if ( (f.smtp_authenticated || ob->authenticated_sender_force)
1708 && local_authenticated_sender)
1710 string_format_nt(p, sizeof(sx->buffer) - (p-sx->buffer), " AUTH=%s",
1711 auth_xtextencode(local_authenticated_sender,
1712 Ustrlen(local_authenticated_sender)));
1713 client_authenticated_sender = string_copy(local_authenticated_sender);
1723 typedef struct smtp_compare_s
1725 uschar * current_sender_address;
1726 struct transport_instance * tblock;
1730 /* Create a unique string that identifies this message, it is based on
1731 sender_address, helo_data and tls_certificate if enabled.
1735 smtp_local_identity(uschar * sender, struct transport_instance * tblock)
1737 address_item * addr1;
1738 uschar * if1 = US"";
1739 uschar * helo1 = US"";
1741 uschar * tlsc1 = US"";
1743 uschar * save_sender_address = sender_address;
1744 uschar * local_identity = NULL;
1745 smtp_transport_options_block * ob = SOB tblock->options_block;
1747 sender_address = sender;
1749 addr1 = deliver_make_addr (sender, TRUE);
1750 deliver_set_expansions(addr1);
1753 if1 = expand_string(ob->interface);
1756 helo1 = expand_string(ob->helo_data);
1759 if (ob->tls_certificate)
1760 tlsc1 = expand_string(ob->tls_certificate);
1761 local_identity = string_sprintf ("%s^%s^%s", if1, helo1, tlsc1);
1763 local_identity = string_sprintf ("%s^%s", if1, helo1);
1766 deliver_set_expansions(NULL);
1767 sender_address = save_sender_address;
1769 return local_identity;
1774 /* This routine is a callback that is called from transport_check_waiting.
1775 This function will evaluate the incoming message versus the previous
1776 message. If the incoming message is using a different local identity then
1777 we will veto this new message. */
1780 smtp_are_same_identities(uschar * message_id, smtp_compare_t * s_compare)
1782 uschar * message_local_identity,
1783 * current_local_identity,
1784 * new_sender_address;
1786 current_local_identity =
1787 smtp_local_identity(s_compare->current_sender_address, s_compare->tblock);
1789 if (!(new_sender_address = spool_sender_from_msgid(message_id)))
1793 message_local_identity =
1794 smtp_local_identity(new_sender_address, s_compare->tblock);
1796 return Ustrcmp(current_local_identity, message_local_identity) == 0;
1802 ehlo_response(uschar * buf, unsigned checks)
1804 PCRE2_SIZE bsize = Ustrlen(buf);
1805 pcre2_match_data * md = pcre2_match_data_create(1, pcre_gen_ctx);
1807 /* debug_printf("%s: check for 0x%04x\n", __FUNCTION__, checks); */
1810 if ( checks & OPTION_TLS
1811 && pcre2_match(regex_STARTTLS,
1812 (PCRE2_SPTR)buf, bsize, 0, PCRE_EOPT, md, pcre_mtc_ctx) < 0)
1814 checks &= ~OPTION_TLS;
1816 if ( checks & OPTION_IGNQ
1817 && pcre2_match(regex_IGNOREQUOTA,
1818 (PCRE2_SPTR)buf, bsize, 0, PCRE_EOPT, md, pcre_mtc_ctx) < 0)
1819 checks &= ~OPTION_IGNQ;
1821 if ( checks & OPTION_CHUNKING
1822 && pcre2_match(regex_CHUNKING,
1823 (PCRE2_SPTR)buf, bsize, 0, PCRE_EOPT, md, pcre_mtc_ctx) < 0)
1824 checks &= ~OPTION_CHUNKING;
1826 #ifndef DISABLE_PRDR
1827 if ( checks & OPTION_PRDR
1828 && pcre2_match(regex_PRDR,
1829 (PCRE2_SPTR)buf, bsize, 0, PCRE_EOPT, md, pcre_mtc_ctx) < 0)
1831 checks &= ~OPTION_PRDR;
1834 if ( checks & OPTION_UTF8
1835 && pcre2_match(regex_UTF8,
1836 (PCRE2_SPTR)buf, bsize, 0, PCRE_EOPT, md, pcre_mtc_ctx) < 0)
1838 checks &= ~OPTION_UTF8;
1840 if ( checks & OPTION_DSN
1841 && pcre2_match(regex_DSN,
1842 (PCRE2_SPTR)buf, bsize, 0, PCRE_EOPT, md, pcre_mtc_ctx) < 0)
1843 checks &= ~OPTION_DSN;
1845 if ( checks & OPTION_PIPE
1846 && pcre2_match(regex_PIPELINING,
1847 (PCRE2_SPTR)buf, bsize, 0, PCRE_EOPT, md, pcre_mtc_ctx) < 0)
1848 checks &= ~OPTION_PIPE;
1850 if ( checks & OPTION_SIZE
1851 && pcre2_match(regex_SIZE,
1852 (PCRE2_SPTR)buf, bsize, 0, PCRE_EOPT, md, pcre_mtc_ctx) < 0)
1853 checks &= ~OPTION_SIZE;
1855 #ifndef DISABLE_PIPE_CONNECT
1856 if ( checks & OPTION_EARLY_PIPE
1857 && pcre2_match(regex_EARLY_PIPE,
1858 (PCRE2_SPTR)buf, bsize, 0, PCRE_EOPT, md, pcre_mtc_ctx) < 0)
1860 checks &= ~OPTION_EARLY_PIPE;
1862 pcre2_match_data_free(md);
1863 /* debug_printf("%s: found 0x%04x\n", __FUNCTION__, checks); */
1869 /* Callback for emitting a BDAT data chunk header.
1871 If given a nonzero size, first flush any buffered SMTP commands
1872 then emit the command.
1874 Reap previous SMTP command responses if requested, and always reap
1875 the response from a previous BDAT command.
1878 tctx transport context
1879 chunk_size value for SMTP BDAT command
1881 tc_chunk_last add LAST option to SMTP BDAT command
1882 tc_reap_prev reap response to previous SMTP commands
1886 DEFER TLS error on first read (EHLO-resp); errno set
1890 smtp_chunk_cmd_callback(transport_ctx * tctx, unsigned chunk_size,
1893 smtp_transport_options_block * ob = SOB tctx->tblock->options_block;
1894 smtp_context * sx = tctx->smtp_context;
1898 /* Write SMTP chunk header command. If not reaping responses, note that
1899 there may be more writes (like, the chunk data) done soon. */
1903 #ifndef DISABLE_PIPE_CONNECT
1904 BOOL new_conn = !!(sx->outblock.conn_args);
1906 if((cmd_count = smtp_write_command(sx,
1907 flags & tc_reap_prev ? SCMD_FLUSH : SCMD_MORE,
1908 "BDAT %u%s\r\n", chunk_size, flags & tc_chunk_last ? " LAST" : "")
1909 ) < 0) return ERROR;
1910 if (flags & tc_chunk_last)
1911 data_command = string_copy(big_buffer); /* Save for later error message */
1912 #ifndef DISABLE_PIPE_CONNECT
1913 /* That command write could have been the one that made the connection.
1914 Copy the fd from the client conn ctx (smtp transport specific) to the
1915 generic transport ctx. */
1918 tctx->u.fd = sx->outblock.cctx->sock;
1922 prev_cmd_count = cmd_count += sx->cmd_count;
1924 /* Reap responses for any previous, but not one we just emitted */
1928 if (sx->pending_BDAT)
1931 if (flags & tc_reap_prev && prev_cmd_count > 0)
1933 DEBUG(D_transport) debug_printf("look for %d responses"
1934 " for previous pipelined cmds\n", prev_cmd_count);
1936 switch(sync_responses(sx, prev_cmd_count, 0))
1938 case 1: /* 2xx (only) => OK */
1939 case 3: sx->good_RCPT = TRUE; /* 2xx & 5xx => OK & progress made */
1940 case 2: sx->completed_addr = TRUE; /* 5xx (only) => progress made */
1941 case 0: break; /* No 2xx or 5xx, but no probs */
1943 case -5: errno = ERRNO_TLSFAILURE;
1945 #ifndef DISABLE_PIPE_CONNECT
1946 case -4: /* non-2xx for pipelined banner or EHLO */
1948 case -1: /* Timeout on RCPT */
1949 default: return ERROR; /* I/O error, or any MAIL/DATA error */
1952 if (!sx->pending_BDAT)
1953 pipelining_active = FALSE;
1956 /* Reap response for an outstanding BDAT */
1958 if (sx->pending_BDAT)
1960 DEBUG(D_transport) debug_printf("look for one response for BDAT\n");
1962 if (!smtp_read_response(sx, sx->buffer, sizeof(sx->buffer), '2',
1963 ob->command_timeout))
1965 if (errno == 0 && sx->buffer[0] == '4')
1967 errno = ERRNO_DATA4XX; /*XXX does this actually get used? */
1968 sx->addrlist->more_errno |=
1969 ((sx->buffer[1] - '0')*10 + sx->buffer[2] - '0') << 8;
1974 sx->pending_BDAT = FALSE;
1975 pipelining_active = FALSE;
1977 else if (chunk_size > 0)
1978 sx->pending_BDAT = TRUE;
1981 sx->cmd_count = cmd_count;
1987 /*************************************************
1988 * Make connection for given message *
1989 *************************************************/
1993 sx connection context
1994 suppress_tls if TRUE, don't attempt a TLS connection - this is set for
1995 a second attempt after TLS initialization fails
1997 Returns: OK - the connection was made and the delivery attempted;
1998 fd is set in the conn context, tls_out set up.
1999 DEFER - the connection could not be made, or something failed
2000 while setting up the SMTP session, or there was a
2001 non-message-specific error, such as a timeout.
2002 ERROR - helo_data or add_headers or authenticated_sender is
2003 specified for this transport, and the string failed
2007 smtp_setup_conn(smtp_context * sx, BOOL suppress_tls)
2009 smtp_transport_options_block * ob = sx->conn_args.tblock->options_block;
2010 BOOL pass_message = FALSE;
2011 uschar * message = NULL;
2014 uschar * tls_errstr;
2017 sx->conn_args.ob = ob;
2019 sx->lmtp = strcmpic(ob->protocol, US"lmtp") == 0;
2020 sx->smtps = strcmpic(ob->protocol, US"smtps") == 0;
2021 /* sx->ok = FALSE; */
2022 sx->send_rset = TRUE;
2023 sx->send_quit = TRUE;
2024 sx->setting_up = TRUE;
2026 /* sx->esmtp_sent = FALSE; */
2028 /* sx->utf8_needed = FALSE; */
2030 sx->dsn_all_lasthop = TRUE;
2032 /* sx->conn_args.dane = FALSE; */
2034 verify_check_given_host(CUSS &ob->hosts_require_dane, sx->conn_args.host) == OK;
2036 #ifndef DISABLE_PIPE_CONNECT
2037 /* sx->early_pipe_active = sx->early_pipe_ok = FALSE; */
2038 /* sx->ehlo_resp.cleartext_features = sx->ehlo_resp.crypted_features = 0; */
2039 /* sx->pending_BANNER = sx->pending_EHLO = sx->pending_MAIL = FALSE; */
2042 if ((sx->max_mail = sx->conn_args.tblock->connection_max_messages) == 0) sx->max_mail = 999999;
2043 if ((sx->max_rcpt = sx->conn_args.tblock->max_addresses) == 0) sx->max_rcpt = 999999;
2044 /* sx->peer_offered = 0; */
2045 /* sx->avoid_option = 0; */
2046 sx->igquotstr = US"";
2047 if (!sx->helo_data) sx->helo_data = ob->helo_data;
2048 #ifdef EXPERIMENTAL_DSN_INFO
2049 /* sx->smtp_greeting = NULL; */
2050 /* sx->helo_response = NULL; */
2053 smtp_command = US"initial connection";
2054 /* sx->buffer[0] = '\0'; */
2056 /* Set up the buffer for reading SMTP response packets. */
2058 sx->inblock.buffer = sx->inbuffer;
2059 sx->inblock.buffersize = sizeof(sx->inbuffer);
2060 sx->inblock.ptr = sx->inbuffer;
2061 sx->inblock.ptrend = sx->inbuffer;
2063 /* Set up the buffer for holding SMTP commands while pipelining */
2065 sx->outblock.buffer = sx->outbuffer;
2066 sx->outblock.buffersize = sizeof(sx->outbuffer);
2067 sx->outblock.ptr = sx->outbuffer;
2068 /* sx->outblock.cmd_count = 0; */
2069 /* sx->outblock.authenticating = FALSE; */
2070 /* sx->outblock.conn_args = NULL; */
2072 /* Reset the parameters of a TLS session. */
2075 tls_out.cipher = NULL; /* the one we may use for this transport */
2076 tls_out.ourcert = NULL;
2077 tls_out.peercert = NULL;
2078 tls_out.peerdn = NULL;
2082 tls_out.ocsp = OCSP_NOT_REQ;
2083 #ifndef DISABLE_TLS_RESUME
2084 tls_out.resumption = 0;
2088 /* Flip the legacy TLS-related variables over to the outbound set in case
2089 they're used in the context of the transport. Don't bother resetting
2090 afterward (when being used by a transport) as we're in a subprocess.
2091 For verify, unflipped once the callout is dealt with */
2093 tls_modify_variables(&tls_out);
2098 set_errno_nohost(sx->addrlist, ERRNO_TLSFAILURE, US"TLS support not available",
2099 DEFER, FALSE, &sx->delivery_start);
2104 /* If we have a proxied TLS connection, check usability for this message */
2106 if (continue_hostname && continue_proxy_cipher)
2109 const uschar * sni = US"";
2111 # ifdef SUPPORT_DANE
2112 /* Check if the message will be DANE-verified; if so force its SNI */
2114 tls_out.dane_verified = FALSE;
2115 smtp_port_for_connect(sx->conn_args.host, sx->port);
2116 if ( sx->conn_args.host->dnssec == DS_YES
2117 && ( sx->dane_required
2118 || verify_check_given_host(CUSS &ob->hosts_try_dane, sx->conn_args.host) == OK
2120 switch (rc = tlsa_lookup(sx->conn_args.host, &sx->conn_args.tlsa_dnsa, sx->dane_required))
2122 case OK: sx->conn_args.dane = TRUE;
2123 ob->tls_tempfail_tryclear = FALSE; /* force TLS */
2124 ob->tls_sni = sx->conn_args.host->name; /* force SNI */
2126 case FAIL_FORCED: break;
2127 default: set_errno_nohost(sx->addrlist, ERRNO_DNSDEFER,
2128 string_sprintf("DANE error: tlsa lookup %s",
2130 rc, FALSE, &sx->delivery_start);
2131 # ifndef DISABLE_EVENT
2132 (void) event_raise(sx->conn_args.tblock->event_action,
2133 US"dane:fail", sx->dane_required
2134 ? US"dane-required" : US"dnssec-invalid");
2140 /* If the SNI or the DANE status required for the new message differs from the
2141 existing conn drop the connection to force a new one. */
2143 if (ob->tls_sni && !(sni = expand_cstring(ob->tls_sni)))
2144 log_write(0, LOG_MAIN|LOG_PANIC,
2145 "<%s>: failed to expand transport's tls_sni value: %s",
2146 sx->addrlist->address, expand_string_message);
2148 # ifdef SUPPORT_DANE
2149 if ( (continue_proxy_sni ? (Ustrcmp(continue_proxy_sni, sni) == 0) : !*sni)
2150 && continue_proxy_dane == sx->conn_args.dane)
2152 tls_out.sni = US sni;
2153 if ((tls_out.dane_verified = continue_proxy_dane))
2154 sx->conn_args.host->dnssec = DS_YES;
2157 if ((continue_proxy_sni ? (Ustrcmp(continue_proxy_sni, sni) == 0) : !*sni))
2158 tls_out.sni = US sni;
2163 debug_printf("Closing proxied-TLS connection due to SNI mismatch\n");
2165 HDEBUG(D_transport|D_acl|D_v) debug_printf_indent(" SMTP>> QUIT\n");
2166 write(0, "QUIT\r\n", 6);
2168 continue_hostname = continue_proxy_cipher = NULL;
2169 f.continue_more = FALSE;
2170 continue_sequence = 1; /* Unfortunately, this process cannot affect success log
2171 which is done by delivery proc. Would have to pass this
2172 back through reporting pipe. */
2175 #endif /*!DISABLE_TLS*/
2177 /* Make a connection to the host if this isn't a continued delivery, and handle
2178 the initial interaction and HELO/EHLO/LHLO. Connect timeout errors are handled
2179 specially so they can be identified for retries. */
2181 if (!continue_hostname)
2184 HDEBUG(D_verify) debug_printf("interface=%s port=%d\n", sx->conn_args.interface, sx->port);
2186 /* Arrange to report to calling process this is a new connection */
2188 clearflag(sx->first_addr, af_cont_conn);
2189 setflag(sx->first_addr, af_new_conn);
2191 /* Get the actual port the connection will use, into sx->conn_args.host */
2193 smtp_port_for_connect(sx->conn_args.host, sx->port);
2196 /* Do TLSA lookup for DANE */
2198 tls_out.dane_verified = FALSE;
2199 tls_out.tlsa_usage = 0;
2201 if (sx->conn_args.host->dnssec == DS_YES)
2204 if( sx->dane_required
2205 || verify_check_given_host(CUSS &ob->hosts_try_dane, sx->conn_args.host) == OK
2207 switch (rc = tlsa_lookup(sx->conn_args.host, &sx->conn_args.tlsa_dnsa, sx->dane_required))
2209 case OK: sx->conn_args.dane = TRUE;
2210 ob->tls_tempfail_tryclear = FALSE; /* force TLS */
2211 ob->tls_sni = sx->conn_args.host->name; /* force SNI */
2213 case FAIL_FORCED: break;
2214 default: set_errno_nohost(sx->addrlist, ERRNO_DNSDEFER,
2215 string_sprintf("DANE error: tlsa lookup %s",
2217 rc, FALSE, &sx->delivery_start);
2218 # ifndef DISABLE_EVENT
2219 (void) event_raise(sx->conn_args.tblock->event_action,
2220 US"dane:fail", sx->dane_required
2221 ? US"dane-required" : US"dnssec-invalid");
2226 else if (sx->dane_required)
2228 set_errno_nohost(sx->addrlist, ERRNO_DNSDEFER,
2229 string_sprintf("DANE error: %s lookup not DNSSEC", sx->conn_args.host->name),
2230 FAIL, FALSE, &sx->delivery_start);
2231 # ifndef DISABLE_EVENT
2232 (void) event_raise(sx->conn_args.tblock->event_action,
2233 US"dane:fail", US"dane-required");
2240 /* Make the TCP connection */
2242 sx->cctx.tls_ctx = NULL;
2243 sx->inblock.cctx = sx->outblock.cctx = &sx->cctx;
2244 #ifdef EXPERIMENTAL_ESMTP_LIMITS
2245 sx->peer_limit_mail = sx->peer_limit_rcpt = sx->peer_limit_rcptdom =
2247 sx->avoid_option = sx->peer_offered = smtp_peer_options = 0;
2249 #ifndef DISABLE_PIPE_CONNECT
2250 if ( verify_check_given_host(CUSS &ob->hosts_pipe_connect,
2251 sx->conn_args.host) == OK)
2253 /* We don't find out the local ip address until the connect, so if
2254 the helo string might use it avoid doing early-pipelining. */
2257 || !Ustrstr(sx->helo_data, "$sending_ip_address")
2258 || Ustrstr(sx->helo_data, "def:sending_ip_address")
2261 sx->early_pipe_ok = TRUE;
2262 if ( read_ehlo_cache_entry(sx)
2263 && sx->ehlo_resp.cleartext_features & OPTION_EARLY_PIPE)
2266 debug_printf("Using cached cleartext PIPECONNECT\n");
2267 sx->early_pipe_active = TRUE;
2268 sx->peer_offered = sx->ehlo_resp.cleartext_features;
2271 else DEBUG(D_transport)
2272 debug_printf("helo needs $sending_ip_address\n");
2275 if (sx->early_pipe_active)
2276 sx->outblock.conn_args = &sx->conn_args;
2280 blob lazy_conn = {.data = NULL};
2281 /* For TLS-connect, a TFO lazy-connect is useful since the Client Hello
2282 can go on the TCP SYN. */
2284 if ((sx->cctx.sock = smtp_connect(&sx->conn_args,
2285 sx->smtps ? &lazy_conn : NULL)) < 0)
2287 set_errno_nohost(sx->addrlist,
2288 errno == ETIMEDOUT ? ERRNO_CONNECTTIMEOUT : errno,
2289 sx->verify ? US strerror(errno) : NULL,
2290 DEFER, FALSE, &sx->delivery_start);
2291 sx->send_quit = FALSE;
2295 (void) setsockopt(sx->cctx.sock, IPPROTO_TCP, TCP_QUICKACK, US &off,
2299 /* Expand the greeting message while waiting for the initial response. (Makes
2300 sense if helo_data contains ${lookup dnsdb ...} stuff). The expansion is
2301 delayed till here so that $sending_interface and $sending_port are set. */
2302 /*XXX early-pipe: they still will not be. Is there any way to find out what they
2303 will be? Somehow I doubt it. */
2306 if (!(sx->helo_data = expand_string(sx->helo_data)))
2308 log_write(0, LOG_MAIN|LOG_PANIC,
2309 "<%s>: failed to expand transport's helo_data value for callout: %s",
2310 sx->addrlist->address, expand_string_message);
2315 expand_string_message = NULL;
2316 if ((sx->helo_data = string_domain_utf8_to_alabel(sx->helo_data,
2317 &expand_string_message)),
2318 expand_string_message)
2320 log_write(0, LOG_MAIN|LOG_PANIC,
2321 "<%s>: failed to expand transport's helo_data value for callout: %s",
2322 sx->addrlist->address, expand_string_message);
2324 sx->helo_data = NULL;
2328 /* The first thing is to wait for an initial OK response. The dreaded "goto"
2329 is nevertheless a reasonably clean way of programming this kind of logic,
2330 where you want to escape on any error. */
2334 #ifndef DISABLE_PIPE_CONNECT
2335 if (sx->early_pipe_active)
2337 sx->pending_BANNER = TRUE; /* sync_responses() must eventually handle */
2338 sx->outblock.cmd_count = 1;
2343 if (!smtp_reap_banner(sx))
2344 goto RESPONSE_FAILED;
2347 #ifndef DISABLE_EVENT
2350 lookup_dnssec_authenticated = sx->conn_args.host->dnssec==DS_YES ? US"yes"
2351 : sx->conn_args.host->dnssec==DS_NO ? US"no" : NULL;
2352 s = event_raise(sx->conn_args.tblock->event_action, US"smtp:connect", sx->buffer);
2355 set_errno_nohost(sx->addrlist, ERRNO_EXPANDFAIL,
2356 string_sprintf("deferred by smtp:connect event expansion: %s", s),
2357 DEFER, FALSE, &sx->delivery_start);
2364 /* Now check if the helo_data expansion went well, and sign off cleanly if
2369 message = string_sprintf("failed to expand helo_data: %s",
2370 expand_string_message);
2371 set_errno_nohost(sx->addrlist, ERRNO_EXPANDFAIL, message, DEFER, FALSE, &sx->delivery_start);
2377 /** Debugging without sending a message
2378 sx->addrlist->transport_return = DEFER;
2382 /* Errors that occur after this point follow an SMTP command, which is
2383 left in big_buffer by smtp_write_command() for use in error messages. */
2385 smtp_command = big_buffer;
2387 /* Tell the remote who we are...
2389 February 1998: A convention has evolved that ESMTP-speaking MTAs include the
2390 string "ESMTP" in their greeting lines, so make Exim send EHLO if the
2391 greeting is of this form. The assumption was that the far end supports it
2392 properly... but experience shows that there are some that give 5xx responses,
2393 even though the banner includes "ESMTP" (there's a bloody-minded one that
2394 says "ESMTP not spoken here"). Cope with that case.
2396 September 2000: Time has passed, and it seems reasonable now to always send
2397 EHLO at the start. It is also convenient to make the change while installing
2400 July 2003: Joachim Wieland met a broken server that advertises "PIPELINING"
2401 but times out after sending MAIL FROM, RCPT TO and DATA all together. There
2402 would be no way to send out the mails, so there is now a host list
2403 "hosts_avoid_esmtp" that disables ESMTP for special hosts and solves the
2404 PIPELINING problem as well. Maybe it can also be useful to cure other
2405 problems with broken servers.
2407 Exim originally sent "Helo" at this point and ran for nearly a year that way.
2408 Then somebody tried it with a Microsoft mailer... It seems that all other
2409 mailers use upper case for some reason (the RFC is quite clear about case
2410 independence) so, for peace of mind, I gave in. */
2412 sx->esmtp = verify_check_given_host(CUSS &ob->hosts_avoid_esmtp, sx->conn_args.host) != OK;
2414 /* Alas; be careful, since this goto is not an error-out, so conceivably
2415 we might set data between here and the target which we assume to exist
2416 and be usable. I can see this coming back to bite us. */
2420 smtp_peer_options |= OPTION_TLS;
2421 suppress_tls = FALSE;
2422 ob->tls_tempfail_tryclear = FALSE;
2423 smtp_command = US"SSL-on-connect";
2430 if (smtp_write_command(sx,
2431 #ifndef DISABLE_PIPE_CONNECT
2432 sx->early_pipe_active ? SCMD_BUFFER :
2435 "%s %s\r\n", sx->lmtp ? "LHLO" : "EHLO", sx->helo_data) < 0)
2437 sx->esmtp_sent = TRUE;
2439 #ifndef DISABLE_PIPE_CONNECT
2440 if (sx->early_pipe_active)
2442 sx->pending_EHLO = TRUE;
2444 /* If we have too many authenticators to handle and might need to AUTH
2445 for this transport, pipeline no further as we will need the
2446 list of auth methods offered. Reap the banner and EHLO. */
2448 if ( (ob->hosts_require_auth || ob->hosts_try_auth)
2449 && f.smtp_in_early_pipe_no_auth)
2451 DEBUG(D_transport) debug_printf("may need to auth, so pipeline no further\n");
2452 if (smtp_write_command(sx, SCMD_FLUSH, NULL) < 0)
2454 if (sync_responses(sx, 2, 0) != 0)
2457 debug_printf("failed reaping pipelined cmd responses\n");
2458 goto RESPONSE_FAILED;
2460 sx->early_pipe_active = FALSE;
2465 if (!smtp_reap_ehlo(sx))
2466 goto RESPONSE_FAILED;
2470 debug_printf("not sending EHLO (host matches hosts_avoid_esmtp)\n");
2472 #ifndef DISABLE_PIPE_CONNECT
2473 if (!sx->early_pipe_active)
2478 int n = sizeof(sx->buffer);
2479 uschar * rsp = sx->buffer;
2481 if (sx->esmtp_sent && (n = Ustrlen(sx->buffer) + 1) < sizeof(sx->buffer)/2)
2482 { rsp = sx->buffer + n; n = sizeof(sx->buffer) - n; }
2484 if (smtp_write_command(sx, SCMD_FLUSH, "HELO %s\r\n", sx->helo_data) < 0)
2486 good_response = smtp_read_response(sx, rsp, n, '2', ob->command_timeout);
2487 #ifdef EXPERIMENTAL_DSN_INFO
2488 sx->helo_response = string_copy(rsp);
2492 /* Handle special logging for a closed connection after HELO
2493 when had previously sent EHLO */
2495 if (rsp != sx->buffer && rsp[0] == 0 && (errno == 0 || errno == ECONNRESET))
2497 errno = ERRNO_SMTPCLOSED;
2498 goto EHLOHELO_FAILED;
2500 memmove(sx->buffer, rsp, Ustrlen(rsp));
2501 goto RESPONSE_FAILED;
2505 if (sx->esmtp || sx->lmtp)
2507 #ifndef DISABLE_PIPE_CONNECT
2508 if (!sx->early_pipe_active)
2511 sx->peer_offered = ehlo_response(sx->buffer,
2512 OPTION_TLS /* others checked later */
2513 #ifndef DISABLE_PIPE_CONNECT
2514 | (sx->early_pipe_ok
2516 | OPTION_CHUNKING | OPTION_PRDR | OPTION_DSN | OPTION_PIPE | OPTION_SIZE
2525 #ifdef EXPERIMENTAL_ESMTP_LIMITS
2526 if (tls_out.active.sock >= 0 || !(sx->peer_offered & OPTION_TLS))
2528 ehlo_response_limits_read(sx);
2529 ehlo_response_limits_apply(sx);
2532 #ifndef DISABLE_PIPE_CONNECT
2533 if (sx->early_pipe_ok)
2535 sx->ehlo_resp.cleartext_features = sx->peer_offered;
2537 if ( (sx->peer_offered & (OPTION_PIPE | OPTION_EARLY_PIPE))
2538 == (OPTION_PIPE | OPTION_EARLY_PIPE))
2540 DEBUG(D_transport) debug_printf("PIPE_CONNECT usable in future for this IP\n");
2541 sx->ehlo_resp.cleartext_auths = study_ehlo_auths(sx);
2542 write_ehlo_cache_entry(sx);
2548 /* Set tls_offered if the response to EHLO specifies support for STARTTLS. */
2551 smtp_peer_options |= sx->peer_offered & OPTION_TLS;
2556 /* For continuing deliveries down the same channel, having re-exec'd the socket
2557 is the standard input; for a socket held open from verify it is recorded
2558 in the cutthrough context block. Either way we don't need to redo EHLO here
2559 (but may need to do so for TLS - see below).
2560 Set up the pointer to where subsequent commands will be left, for
2561 error messages. Note that smtp_peer_options will have been
2562 set from the command line if they were set in the process that passed the
2565 /*XXX continue case needs to propagate DSN_INFO, prob. in deliver.c
2566 as the continue goes via transport_pass_socket() and doublefork and exec.
2567 It does not wait. Unclear how we keep separate host's responses
2568 separate - we could match up by host ip+port as a bodge. */
2572 if (cutthrough.cctx.sock >= 0 && cutthrough.callout_hold_only)
2574 sx->cctx = cutthrough.cctx;
2575 sx->conn_args.host->port = sx->port = cutthrough.host.port;
2579 sx->cctx.sock = 0; /* stdin */
2580 sx->cctx.tls_ctx = NULL;
2581 smtp_port_for_connect(sx->conn_args.host, sx->port); /* Record the port that was used */
2583 sx->inblock.cctx = sx->outblock.cctx = &sx->cctx;
2584 smtp_command = big_buffer;
2585 sx->peer_offered = smtp_peer_options;
2586 #ifdef EXPERIMENTAL_ESMTP_LIMITS
2587 /* Limits passed by cmdline over exec. */
2588 ehlo_limits_apply(sx,
2589 sx->peer_limit_mail = continue_limit_mail,
2590 sx->peer_limit_rcpt = continue_limit_rcpt,
2591 sx->peer_limit_rcptdom = continue_limit_rcptdom);
2593 sx->helo_data = NULL; /* ensure we re-expand ob->helo_data */
2595 /* For a continued connection with TLS being proxied for us, or a
2596 held-open verify connection with TLS, nothing more to do. */
2598 if ( continue_proxy_cipher
2599 || (cutthrough.cctx.sock >= 0 && cutthrough.callout_hold_only
2600 && cutthrough.is_tls)
2603 sx->pipelining_used = pipelining_active = !!(smtp_peer_options & OPTION_PIPE);
2604 HDEBUG(D_transport) debug_printf("continued connection, %s TLS\n",
2605 continue_proxy_cipher ? "proxied" : "verify conn with");
2608 HDEBUG(D_transport) debug_printf("continued connection, no TLS\n");
2611 /* If TLS is available on this connection, whether continued or not, attempt to
2612 start up a TLS session, unless the host is in hosts_avoid_tls. If successful,
2613 send another EHLO - the server may give a different answer in secure mode. We
2614 use a separate buffer for reading the response to STARTTLS so that if it is
2615 negative, the original EHLO data is available for subsequent analysis, should
2616 the client not be required to use TLS. If the response is bad, copy the buffer
2617 for error analysis. */
2620 if ( smtp_peer_options & OPTION_TLS
2622 && verify_check_given_host(CUSS &ob->hosts_avoid_tls, sx->conn_args.host) != OK
2624 || verify_check_given_host(CUSS &ob->hosts_verify_avoid_tls, sx->conn_args.host) != OK
2627 uschar buffer2[4096];
2629 if (smtp_write_command(sx, SCMD_FLUSH, "STARTTLS\r\n") < 0)
2632 #ifndef DISABLE_PIPE_CONNECT
2633 /* If doing early-pipelining reap the banner and EHLO-response but leave
2634 the response for the STARTTLS we just sent alone. On fail, assume wrong
2635 cached capability and retry with the pipelining disabled. */
2637 if (sx->early_pipe_active && sync_responses(sx, 2, 0) != 0)
2640 debug_printf("failed reaping pipelined cmd responses\n");
2641 close(sx->cctx.sock);
2643 sx->early_pipe_active = FALSE;
2644 goto PIPE_CONNECT_RETRY;
2648 /* If there is an I/O error, transmission of this message is deferred. If
2649 there is a temporary rejection of STARRTLS and tls_tempfail_tryclear is
2650 false, we also defer. However, if there is a temporary rejection of STARTTLS
2651 and tls_tempfail_tryclear is true, or if there is an outright rejection of
2652 STARTTLS, we carry on. This means we will try to send the message in clear,
2653 unless the host is in hosts_require_tls (tested below). */
2655 if (!smtp_read_response(sx, buffer2, sizeof(buffer2), '2', ob->command_timeout))
2659 || (buffer2[0] == '4' && !ob->tls_tempfail_tryclear)
2662 Ustrncpy(sx->buffer, buffer2, sizeof(sx->buffer));
2663 sx->buffer[sizeof(sx->buffer)-1] = '\0';
2664 goto RESPONSE_FAILED;
2668 /* STARTTLS accepted: try to negotiate a TLS session. */
2673 if (!tls_client_start(&sx->cctx, &sx->conn_args, sx->addrlist, &tls_out, &tls_errstr))
2675 /* TLS negotiation failed; give an error. From outside, this function may
2676 be called again to try in clear on a new connection, if the options permit
2677 it for this host. */
2679 DEBUG(D_tls) debug_printf("TLS session fail: %s\n", tls_errstr);
2681 # ifdef SUPPORT_DANE
2682 if (sx->conn_args.dane)
2684 log_write(0, LOG_MAIN,
2685 "DANE attempt failed; TLS connection to %s [%s]: %s",
2686 sx->conn_args.host->name, sx->conn_args.host->address, tls_errstr);
2687 # ifndef DISABLE_EVENT
2688 (void) event_raise(sx->conn_args.tblock->event_action,
2689 US"dane:fail", US"validation-failure"); /* could do with better detail */
2694 errno = ERRNO_TLSFAILURE;
2695 message = string_sprintf("TLS session: %s", tls_errstr);
2696 sx->send_quit = FALSE;
2699 sx->send_tlsclose = TRUE;
2701 /* TLS session is set up. Check the inblock fill level. If there is
2702 content then as we have not yet done a tls read it must have arrived before
2703 the TLS handshake, in-clear. That violates the sync requirement of the
2704 STARTTLS RFC, so fail. */
2706 if (sx->inblock.ptr != sx->inblock.ptrend)
2710 int i = sx->inblock.ptrend - sx->inblock.ptr;
2711 debug_printf("unused data in input buffer after ack for STARTTLS:\n"
2713 i > 100 ? 100 : i, sx->inblock.ptr, i > 100 ? "..." : "");
2715 tls_errstr = US"synch error before connect";
2716 goto TLS_CONN_FAILED;
2719 smtp_peer_options_wrap = smtp_peer_options;
2720 for (address_item * addr = sx->addrlist; addr; addr = addr->next)
2721 if (addr->transport_return == PENDING_DEFER)
2723 addr->cipher = tls_out.cipher;
2724 addr->ourcert = tls_out.ourcert;
2725 addr->peercert = tls_out.peercert;
2726 addr->peerdn = tls_out.peerdn;
2727 addr->ocsp = tls_out.ocsp;
2728 addr->tlsver = tls_out.ver;
2733 /* if smtps, we'll have smtp_command set to something else; always safe to
2735 smtp_command = big_buffer;
2737 /* If we started TLS, redo the EHLO/LHLO exchange over the secure channel. If
2738 helo_data is null, we are dealing with a connection that was passed from
2739 another process, and so we won't have expanded helo_data above. We have to
2740 expand it here. $sending_ip_address and $sending_port are set up right at the
2741 start of the Exim process (in exim.c). */
2743 if (tls_out.active.sock >= 0)
2745 uschar * greeting_cmd;
2747 if (!sx->helo_data && !(sx->helo_data = expand_string(ob->helo_data)))
2749 uschar *message = string_sprintf("failed to expand helo_data: %s",
2750 expand_string_message);
2751 set_errno_nohost(sx->addrlist, ERRNO_EXPANDFAIL, message, DEFER, FALSE, &sx->delivery_start);
2756 #ifndef DISABLE_PIPE_CONNECT
2757 /* For SMTPS there is no cleartext early-pipe; use the crypted permission bit.
2758 We're unlikely to get the group sent and delivered before the server sends its
2759 banner, but it's still worth sending as a group.
2760 For STARTTLS allow for cleartext early-pipe but no crypted early-pipe, but not
2763 if (sx->smtps ? sx->early_pipe_ok : sx->early_pipe_active)
2765 sx->peer_offered = sx->ehlo_resp.crypted_features;
2766 if ((sx->early_pipe_active =
2767 !!(sx->ehlo_resp.crypted_features & OPTION_EARLY_PIPE)))
2768 DEBUG(D_transport) debug_printf("Using cached crypted PIPECONNECT\n");
2771 #ifdef EXPERIMMENTAL_ESMTP_LIMITS
2772 /* As we are about to send another EHLO, forget any LIMITS received so far. */
2773 sx->peer_limit_mail = sx->peer_limit_rcpt = sx->peer_limit_rcptdom = 0;
2774 if ((sx->max_mail = sx->conn_args.tblock->connection_max_message) == 0) sx->max_mail = 999999;
2775 if ((sx->max_rcpt = sx->conn_args.tblock->max_addresses) == 0) sx->max_rcpt = 999999;
2776 sx->single_rcpt_domain = FALSE;
2779 /* For SMTPS we need to wait for the initial OK response. */
2781 #ifndef DISABLE_PIPE_CONNECT
2782 if (sx->early_pipe_active)
2784 sx->pending_BANNER = TRUE;
2785 sx->outblock.cmd_count = 1;
2789 if (!smtp_reap_banner(sx))
2790 goto RESPONSE_FAILED;
2793 greeting_cmd = US"LHLO";
2795 greeting_cmd = US"EHLO";
2798 greeting_cmd = US"HELO";
2800 debug_printf("not sending EHLO (host matches hosts_avoid_esmtp)\n");
2803 if (smtp_write_command(sx,
2804 #ifndef DISABLE_PIPE_CONNECT
2805 sx->early_pipe_active ? SCMD_BUFFER :
2808 "%s %s\r\n", greeting_cmd, sx->helo_data) < 0)
2811 #ifndef DISABLE_PIPE_CONNECT
2812 if (sx->early_pipe_active)
2813 sx->pending_EHLO = TRUE;
2817 if (!smtp_reap_ehlo(sx))
2820 /* The GnuTLS layer in Exim only spots a server-rejection of a client
2821 cert late, under TLS1.3 - which means here; the first time we try to
2822 receive crypted data. Treat it as if it was a connect-time failure.
2823 See also the early-pipe equivalent... which will be hard; every call
2824 to sync_responses will need to check the result.
2825 It would be nicer to have GnuTLS check the cert during the handshake.
2826 Can it do that, with all the flexibility we need? */
2828 tls_errstr = US"error on first read";
2829 goto TLS_CONN_FAILED;
2832 goto RESPONSE_FAILED;
2834 smtp_peer_options = 0;
2838 /* If the host is required to use a secure channel, ensure that we
2842 # ifdef SUPPORT_DANE
2843 || sx->conn_args.dane
2845 || verify_check_given_host(CUSS &ob->hosts_require_tls, sx->conn_args.host) == OK
2848 errno = ERRNO_TLSREQUIRED;
2849 message = string_sprintf("a TLS session is required, but %s",
2850 smtp_peer_options & OPTION_TLS
2851 ? "an attempt to start TLS failed" : "the server did not offer TLS support");
2852 # if defined(SUPPORT_DANE) && !defined(DISABLE_EVENT)
2853 if (sx->conn_args.dane)
2854 (void) event_raise(sx->conn_args.tblock->event_action, US"dane:fail",
2855 smtp_peer_options & OPTION_TLS
2856 ? US"validation-failure" /* could do with better detail */
2857 : US"starttls-not-supported");
2861 #endif /*DISABLE_TLS*/
2863 /* If TLS is active, we have just started it up and re-done the EHLO command,
2864 so its response needs to be analyzed. If TLS is not active and this is a
2865 continued session down a previously-used socket, we haven't just done EHLO, so
2868 if ( !continue_hostname
2870 || tls_out.active.sock >= 0
2874 if (sx->esmtp || sx->lmtp)
2876 #ifndef DISABLE_PIPE_CONNECT
2877 if (!sx->early_pipe_active)
2880 sx->peer_offered = ehlo_response(sx->buffer,
2882 #ifndef DISABLE_PIPE_CONNECT
2883 | (sx->lmtp && ob->lmtp_ignore_quota ? OPTION_IGNQ : 0)
2884 | OPTION_DSN | OPTION_PIPE | OPTION_SIZE
2885 | OPTION_CHUNKING | OPTION_PRDR | OPTION_UTF8
2886 | (tls_out.active.sock >= 0 ? OPTION_EARLY_PIPE : 0) /* not for lmtp */
2890 | (sx->lmtp && ob->lmtp_ignore_quota ? OPTION_IGNQ : 0)
2893 # ifdef SUPPORT_I18N
2894 | (sx->addrlist->prop.utf8_msg ? OPTION_UTF8 : 0)
2895 /*XXX if we hand peercaps on to continued-conn processes,
2896 must not depend on this addr */
2900 | (ob->size_addition >= 0 ? OPTION_SIZE : 0)
2903 #ifndef DISABLE_PIPE_CONNECT
2904 if (tls_out.active.sock >= 0)
2905 sx->ehlo_resp.crypted_features = sx->peer_offered;
2908 #ifdef EXPERIMENTAL_ESMTP_LIMITS
2909 if (tls_out.active.sock >= 0 || !(sx->peer_offered & OPTION_TLS))
2911 ehlo_response_limits_read(sx);
2912 ehlo_response_limits_apply(sx);
2917 /* Set for IGNOREQUOTA if the response to LHLO specifies support and the
2918 lmtp_ignore_quota option was set. */
2920 sx->igquotstr = sx->peer_offered & OPTION_IGNQ ? US" IGNOREQUOTA" : US"";
2922 /* If the response to EHLO specified support for the SIZE parameter, note
2923 this, provided size_addition is non-negative. */
2925 smtp_peer_options |= sx->peer_offered & OPTION_SIZE;
2927 /* Note whether the server supports PIPELINING. If hosts_avoid_esmtp matched
2928 the current host, esmtp will be false, so PIPELINING can never be used. If
2929 the current host matches hosts_avoid_pipelining, don't do it. */
2931 if ( sx->peer_offered & OPTION_PIPE
2932 && verify_check_given_host(CUSS &ob->hosts_avoid_pipelining, sx->conn_args.host) != OK)
2933 smtp_peer_options |= OPTION_PIPE;
2935 DEBUG(D_transport) debug_printf("%susing PIPELINING\n",
2936 smtp_peer_options & OPTION_PIPE ? "" : "not ");
2938 if ( sx->peer_offered & OPTION_CHUNKING
2939 && verify_check_given_host(CUSS &ob->hosts_try_chunking, sx->conn_args.host) != OK)
2940 sx->peer_offered &= ~OPTION_CHUNKING;
2942 if (sx->peer_offered & OPTION_CHUNKING)
2943 DEBUG(D_transport) debug_printf("CHUNKING usable\n");
2945 #ifndef DISABLE_PRDR
2946 if ( sx->peer_offered & OPTION_PRDR
2947 && verify_check_given_host(CUSS &ob->hosts_try_prdr, sx->conn_args.host) != OK)
2948 sx->peer_offered &= ~OPTION_PRDR;
2950 if (sx->peer_offered & OPTION_PRDR)
2951 DEBUG(D_transport) debug_printf("PRDR usable\n");
2954 /* Note if the server supports DSN */
2955 smtp_peer_options |= sx->peer_offered & OPTION_DSN;
2956 DEBUG(D_transport) debug_printf("%susing DSN\n",
2957 sx->peer_offered & OPTION_DSN ? "" : "not ");
2959 #ifndef DISABLE_PIPE_CONNECT
2960 if ( sx->early_pipe_ok
2961 && !sx->early_pipe_active
2962 && tls_out.active.sock >= 0
2963 && smtp_peer_options & OPTION_PIPE
2964 && ( sx->ehlo_resp.cleartext_features | sx->ehlo_resp.crypted_features)
2965 & OPTION_EARLY_PIPE)
2967 DEBUG(D_transport) debug_printf("PIPECONNECT usable in future for this IP\n");
2968 sx->ehlo_resp.crypted_auths = study_ehlo_auths(sx);
2969 write_ehlo_cache_entry(sx);
2973 /* Note if the response to EHLO specifies support for the AUTH extension.
2974 If it has, check that this host is one we want to authenticate to, and do
2975 the business. The host name and address must be available when the
2976 authenticator's client driver is running. */
2978 switch (yield = smtp_auth(sx))
2980 default: goto SEND_QUIT;
2982 case FAIL_SEND: goto SEND_FAILED;
2983 case FAIL: goto RESPONSE_FAILED;
2987 sx->pipelining_used = pipelining_active = !!(smtp_peer_options & OPTION_PIPE);
2989 /* The setting up of the SMTP call is now complete. Any subsequent errors are
2990 message-specific. */
2992 sx->setting_up = FALSE;
2995 if (sx->addrlist->prop.utf8_msg)
2999 /* If the transport sets a downconversion mode it overrides any set by ACL
3002 if ((s = ob->utf8_downconvert))
3004 if (!(s = expand_string(s)))
3006 message = string_sprintf("failed to expand utf8_downconvert: %s",
3007 expand_string_message);
3008 set_errno_nohost(sx->addrlist, ERRNO_EXPANDFAIL, message, DEFER, FALSE, &sx->delivery_start);
3014 case '1': sx->addrlist->prop.utf8_downcvt = TRUE;
3015 sx->addrlist->prop.utf8_downcvt_maybe = FALSE;
3017 case '0': sx->addrlist->prop.utf8_downcvt = FALSE;
3018 sx->addrlist->prop.utf8_downcvt_maybe = FALSE;
3020 case '-': if (s[1] == '1')
3022 sx->addrlist->prop.utf8_downcvt = FALSE;
3023 sx->addrlist->prop.utf8_downcvt_maybe = TRUE;
3029 sx->utf8_needed = !sx->addrlist->prop.utf8_downcvt
3030 && !sx->addrlist->prop.utf8_downcvt_maybe;
3031 DEBUG(D_transport) if (!sx->utf8_needed)
3032 debug_printf("utf8: %s downconvert\n",
3033 sx->addrlist->prop.utf8_downcvt ? "mandatory" : "optional");
3036 /* If this is an international message we need the host to speak SMTPUTF8 */
3037 if (sx->utf8_needed && !(sx->peer_offered & OPTION_UTF8))
3039 errno = ERRNO_UTF8_FWD;
3040 goto RESPONSE_FAILED;
3042 #endif /*SUPPORT_I18N*/
3051 if (errno == ECONNREFUSED) /* first-read error on a TFO conn */
3053 /* There is a testing facility for simulating a connection timeout, as I
3054 can't think of any other way of doing this. It converts a connection
3055 refused into a timeout if the timeout is set to 999999. This is done for
3056 a 3whs connection in ip_connect(), but a TFO connection does not error
3057 there - instead it gets ECONNREFUSED on the first data read. Tracking
3058 that a TFO really was done is too hard, or we would set a
3059 sx->pending_conn_done bit and test that in smtp_reap_banner() and
3060 smtp_reap_ehlo(). That would let us also add the conn-timeout to the
3063 if (f.running_in_test_harness && ob->connect_timeout == 999999)
3065 set_errno_nohost(sx->addrlist,
3066 errno == ETIMEDOUT ? ERRNO_CONNECTTIMEOUT : errno,
3067 sx->verify ? US strerror(errno) : NULL,
3068 DEFER, FALSE, &sx->delivery_start);
3069 sx->send_quit = FALSE;
3073 /* really an error on an SMTP read */
3075 sx->send_quit = check_response(sx->conn_args.host, &errno, sx->addrlist->more_errno,
3076 sx->buffer, &code, &message, &pass_message);
3082 message = US string_sprintf("smtp send to %s [%s] failed: %s",
3083 sx->conn_args.host->name, sx->conn_args.host->address, strerror(errno));
3084 sx->send_quit = FALSE;
3090 message = string_sprintf("Remote host closed connection in response to %s"
3091 " (EHLO response was: %s)", smtp_command, sx->buffer);
3092 sx->send_quit = FALSE;
3096 /* This label is jumped to directly when a TLS negotiation has failed,
3097 or was not done for a host for which it is required. Values will be set
3098 in message and errno, and setting_up will always be true. Treat as
3099 a temporary error. */
3103 code = '4', yield = DEFER;
3107 /* The failure happened while setting up the call; see if the failure was
3108 a 5xx response (this will either be on connection, or following HELO - a 5xx
3109 after EHLO causes it to try HELO). If so, and there are no more hosts to try,
3110 fail all addresses, as this host is never going to accept them. For other
3111 errors during setting up (timeouts or whatever), defer all addresses, and
3112 yield DEFER, so that the host is not tried again for a while.
3114 XXX This peeking for another host feels like a layering violation. We want
3115 to note the host as unusable, but down here we shouldn't know if this was
3116 the last host to try for the addr(list). Perhaps the upper layer should be
3117 the one to do set_errno() ? The problem is that currently the addr is where
3118 errno etc. are stashed, but until we run out of hosts to try the errors are
3119 host-specific. Maybe we should enhance the host_item definition? */
3122 sx->ok = FALSE; /* For when reached by GOTO */
3123 set_errno(sx->addrlist, errno, message,
3124 sx->conn_args.host->next
3128 || errno == ERRNO_UTF8_FWD
3132 errno == ECONNREFUSED ? NULL : sx->conn_args.host,
3133 #ifdef EXPERIMENTAL_DSN_INFO
3134 sx->smtp_greeting, sx->helo_response,
3136 &sx->delivery_start);
3143 (void)smtp_write_command(sx, SCMD_FLUSH, "QUIT\r\n");
3146 if (sx->cctx.tls_ctx)
3148 if (sx->send_tlsclose)
3150 tls_close(sx->cctx.tls_ctx, TLS_SHUTDOWN_NOWAIT);
3151 sx->send_tlsclose = FALSE;
3153 sx->cctx.tls_ctx = NULL;
3157 /* Close the socket, and return the appropriate value, first setting
3158 works because the NULL setting is passed back to the calling process, and
3159 remote_max_parallel is forced to 1 when delivering over an existing connection,
3162 HDEBUG(D_transport|D_acl|D_v) debug_printf_indent(" SMTP(close)>>\n");
3165 shutdown(sx->cctx.sock, SHUT_WR);
3166 if (fcntl(sx->cctx.sock, F_SETFL, O_NONBLOCK) == 0)
3167 for (int i = 16; read(sx->cctx.sock, sx->inbuffer, sizeof(sx->inbuffer)) > 0 && i > 0;)
3168 i--; /* drain socket */
3169 sx->send_quit = FALSE;
3171 (void)close(sx->cctx.sock);
3174 #ifndef DISABLE_EVENT
3175 (void) event_raise(sx->conn_args.tblock->event_action, US"tcp:close", NULL);
3178 continue_transport = NULL;
3179 continue_hostname = NULL;
3186 /* Create the string of options that will be appended to the MAIL FROM:
3187 in the connection context buffer */
3190 build_mailcmd_options(smtp_context * sx, address_item * addrlist)
3192 uschar * p = sx->buffer;
3193 address_item * addr;
3198 /* If we know the receiving MTA supports the SIZE qualification, and we know it,
3199 send it, adding something to the message size to allow for imprecision
3200 and things that get added en route. Exim keeps the number of lines
3201 in a message, so we can give an accurate value for the original message, but we
3202 need some additional to handle added headers. (Double "." characters don't get
3203 included in the count.) */
3205 if ( message_size > 0
3206 && sx->peer_offered & OPTION_SIZE && !(sx->avoid_option & OPTION_SIZE))
3208 /*XXX problem here under spool_files_wireformat?
3209 Or just forget about lines? Or inflate by a fixed proportion? */
3211 sprintf(CS p, " SIZE=%d", message_size+message_linecount+(SOB sx->conn_args.ob)->size_addition);
3215 #ifndef DISABLE_PRDR
3216 /* If it supports Per-Recipient Data Responses, and we have more than one recipient,
3219 sx->prdr_active = FALSE;
3220 if (sx->peer_offered & OPTION_PRDR)
3221 for (address_item * addr = addrlist; addr; addr = addr->next)
3222 if (addr->transport_return == PENDING_DEFER)
3224 for (addr = addr->next; addr; addr = addr->next)
3225 if (addr->transport_return == PENDING_DEFER)
3226 { /* at least two recipients to send */
3227 sx->prdr_active = TRUE;
3228 sprintf(CS p, " PRDR"); p += 5;
3236 /* If it supports internationalised messages, and this meesage need that,
3239 if ( sx->peer_offered & OPTION_UTF8
3240 && addrlist->prop.utf8_msg
3241 && !addrlist->prop.utf8_downcvt
3243 Ustrcpy(p, US" SMTPUTF8"), p += 9;
3246 /* check if all addresses have DSN-lasthop flag; do not send RET and ENVID if so */
3247 for (sx->dsn_all_lasthop = TRUE, addr = addrlist, address_count = 0;
3248 addr && address_count < sx->max_rcpt; /*XXX maybe also || sx->single_rcpt_domain ? */
3249 addr = addr->next) if (addr->transport_return == PENDING_DEFER)
3252 if (!(addr->dsn_flags & rf_dsnlasthop))
3254 sx->dsn_all_lasthop = FALSE;
3259 /* Add any DSN flags to the mail command */
3261 if (sx->peer_offered & OPTION_DSN && !sx->dsn_all_lasthop)
3263 if (dsn_ret == dsn_ret_hdrs)
3264 { Ustrcpy(p, US" RET=HDRS"); p += 9; }
3265 else if (dsn_ret == dsn_ret_full)
3266 { Ustrcpy(p, US" RET=FULL"); p += 9; }
3270 string_format(p, sizeof(sx->buffer) - (p-sx->buffer), " ENVID=%s", dsn_envid);
3275 /* If an authenticated_sender override has been specified for this transport
3276 instance, expand it. If the expansion is forced to fail, and there was already
3277 an authenticated_sender for this message, the original value will be used.
3278 Other expansion failures are serious. An empty result is ignored, but there is
3279 otherwise no check - this feature is expected to be used with LMTP and other
3280 cases where non-standard addresses (e.g. without domains) might be required. */
3282 return smtp_mail_auth_str(sx, p, addrlist) ? ERROR : OK;
3287 build_rcptcmd_options(smtp_context * sx, const address_item * addr)
3289 uschar * p = sx->buffer;
3292 /* Add any DSN flags to the rcpt command */
3294 if (sx->peer_offered & OPTION_DSN && !(addr->dsn_flags & rf_dsnlasthop))
3296 if (addr->dsn_flags & rf_dsnflags)
3300 Ustrcpy(p, US" NOTIFY=");
3302 for (int i = 0; i < nelem(rf_list); i++) if (addr->dsn_flags & rf_list[i])
3304 if (!first) *p++ = ',';
3306 Ustrcpy(p, rf_names[i]);
3311 if (addr->dsn_orcpt)
3313 string_format(p, sizeof(sx->buffer) - (p-sx->buffer), " ORCPT=%s",
3324 0 good, rcpt results in addr->transport_return (PENDING_OK, DEFER, FAIL)
3325 -1 MAIL response error
3326 -2 any non-MAIL read i/o error
3327 -3 non-MAIL response timeout
3328 -4 internal error; channel still usable
3333 smtp_write_mail_and_rcpt_cmds(smtp_context * sx, int * yield)
3335 address_item * addr;
3336 #ifdef EXPERIMENTAL_ESMTP_LIMITS
3337 address_item * restart_addr = NULL;
3339 int address_count, pipe_limit;
3342 if (build_mailcmd_options(sx, sx->first_addr) != OK)
3348 /* From here until we send the DATA command, we can make use of PIPELINING
3349 if the server host supports it. The code has to be able to check the responses
3350 at any point, for when the buffer fills up, so we write it totally generally.
3351 When PIPELINING is off, each command written reports that it has flushed the
3354 sx->pending_MAIL = TRUE; /* The block starts with MAIL */
3357 uschar * s = sx->from_addr;
3359 uschar * errstr = NULL;
3361 /* If we must downconvert, do the from-address here. Remember we had to
3362 for the to-addresses (done below), and also (ugly) for re-doing when building
3363 the delivery log line. */
3365 if ( sx->addrlist->prop.utf8_msg
3366 && (sx->addrlist->prop.utf8_downcvt || !(sx->peer_offered & OPTION_UTF8))
3369 if (s = string_address_utf8_to_alabel(s, &errstr), errstr)
3371 set_errno_nohost(sx->addrlist, ERRNO_EXPANDFAIL, errstr, DEFER, FALSE, &sx->delivery_start);
3375 setflag(sx->addrlist, af_utf8_downcvt);
3379 rc = smtp_write_command(sx, pipelining_active ? SCMD_BUFFER : SCMD_FLUSH,
3380 "MAIL FROM:<%s>%s\r\n", s, sx->buffer);
3383 mail_command = string_copy(big_buffer); /* Save for later error message */
3387 case -1: /* Transmission error */
3390 case +1: /* Cmd was sent */
3391 if (!smtp_read_response(sx, sx->buffer, sizeof(sx->buffer), '2',
3392 (SOB sx->conn_args.ob)->command_timeout))
3394 if (errno == 0 && sx->buffer[0] == '4')
3396 errno = ERRNO_MAIL4XX;
3397 sx->addrlist->more_errno |= ((sx->buffer[1] - '0')*10 + sx->buffer[2] - '0') << 8;
3401 sx->pending_MAIL = FALSE;
3404 /* otherwise zero: command queued for pipeline */
3407 /* Pass over all the relevant recipient addresses for this host, which are the
3408 ones that have status PENDING_DEFER. If we are using PIPELINING, we can send
3409 several before we have to read the responses for those seen so far. This
3410 checking is done by a subroutine because it also needs to be done at the end.
3411 Send only up to max_rcpt addresses at a time, leaving next_addr pointing to
3412 the next one if not all are sent.
3414 In the MUA wrapper situation, we want to flush the PIPELINING buffer for the
3415 last address because we want to abort if any recipients have any kind of
3416 problem, temporary or permanent. We know that all recipient addresses will have
3417 the PENDING_DEFER status, because only one attempt is ever made, and we know
3418 that max_rcpt will be large, so all addresses will be done at once.
3420 For verify we flush the pipeline after any (the only) rcpt address. */
3422 for (addr = sx->first_addr, address_count = 0, pipe_limit = 100;
3423 addr && address_count < sx->max_rcpt;
3424 addr = addr->next) if (addr->transport_return == PENDING_DEFER)
3430 #ifdef EXPERIMENTAL_ESMTP_LIMITS
3431 if ( sx->single_rcpt_domain /* restriction on domains */
3432 && address_count > 0 /* not first being sent */
3433 && Ustrcmp(addr->domain, sx->first_addr->domain) != 0 /* dom diff from first */
3436 DEBUG(D_transport) debug_printf("skipping different domain %s\n", addr->domain);
3438 /* Ensure the smtp-response reaper does not think the address had a RCPT
3439 command sent for it. Reset to PENDING_DEFER in smtp_deliver(), where we
3440 goto SEND_MESSAGE. */
3442 addr->transport_return = SKIP;
3443 if (!restart_addr) restart_addr = addr; /* note restart point */
3444 continue; /* skip this one */
3448 addr->dsn_aware = sx->peer_offered & OPTION_DSN
3449 ? dsn_support_yes : dsn_support_no;
3452 if (pipe_limit-- <= 0)
3453 { no_flush = FALSE; pipe_limit = 100; }
3455 no_flush = pipelining_active && !sx->verify
3456 && (!mua_wrapper || addr->next && address_count < sx->max_rcpt);
3458 build_rcptcmd_options(sx, addr);
3460 /* Now send the RCPT command, and process outstanding responses when
3461 necessary. After a timeout on RCPT, we just end the function, leaving the
3462 yield as OK, because this error can often mean that there is a problem with
3463 just one address, so we don't want to delay the host. */
3465 rcpt_addr = transport_rcpt_address(addr, sx->conn_args.tblock->rcpt_include_affixes);
3468 if ( testflag(sx->addrlist, af_utf8_downcvt)
3469 && !(rcpt_addr = string_address_utf8_to_alabel(rcpt_addr, NULL))
3472 /*XXX could we use a per-address errstr here? Not fail the whole send? */
3473 errno = ERRNO_EXPANDFAIL;
3474 return -5; /*XXX too harsh? */
3478 cmds_sent = smtp_write_command(sx, no_flush ? SCMD_BUFFER : SCMD_FLUSH,
3479 "RCPT TO:<%s>%s%s\r\n", rcpt_addr, sx->igquotstr, sx->buffer);
3481 if (cmds_sent < 0) return -5;
3484 switch(sync_responses(sx, cmds_sent, 0))
3486 case 3: sx->ok = TRUE; /* 2xx & 5xx => OK & progress made */
3487 case 2: sx->completed_addr = TRUE; /* 5xx (only) => progress made */
3490 case 1: sx->ok = TRUE; /* 2xx (only) => OK, but if LMTP, */
3491 if (!sx->lmtp) /* can't tell about progress yet */
3492 sx->completed_addr = TRUE;
3493 case 0: /* No 2xx or 5xx, but no probs */
3494 /* If any RCPT got a 452 response then next_addr has been updated
3495 for restarting with a new MAIL on the same connection. Send no more
3496 RCPTs for this MAIL. */
3500 DEBUG(D_transport) debug_printf("seen 452 too-many-rcpts\n");
3501 sx->RCPT_452 = FALSE;
3502 /* sx->next_addr has been reset for fast_retry */
3507 case -1: return -3; /* Timeout on RCPT */
3508 case -2: return -2; /* non-MAIL read i/o error */
3509 default: return -1; /* any MAIL error */
3511 #ifndef DISABLE_PIPE_CONNECT
3512 case -4: return -1; /* non-2xx for pipelined banner or EHLO */
3513 case -5: return -1; /* TLS first-read error */
3517 } /* Loop for next address */
3519 #ifdef EXPERIMENTAL_ESMTP_LIMITS
3520 sx->next_addr = restart_addr ? restart_addr : addr;
3522 sx->next_addr = addr;
3529 /*****************************************************
3530 * Proxy TLS connection for another transport process *
3531 ******************************************************/
3533 Close the unused end of the pipe, fork once more, then use the given buffer
3534 as a staging area, and select on both the given fd and the TLS'd client-fd for
3535 data to read (per the coding in ip_recv() and fd_ready() this is legitimate).
3536 Do blocking full-size writes, and reads under a timeout. Once both input
3537 channels are closed, exit the process.
3541 buf space to use for buffering
3542 bufsiz size of buffer
3543 pfd pipe filedescriptor array; [0] is comms to proxied process
3544 timeout per-read timeout, seconds
3550 smtp_proxy_tls(void * ct_ctx, uschar * buf, size_t bsize, int * pfd,
3553 struct pollfd p[2] = {{.fd = tls_out.active.sock, .events = POLLIN},
3554 {.fd = pfd[0], .events = POLLIN}};
3556 BOOL send_tls_shutdown = TRUE;
3559 if ((rc = exim_fork(US"tls-proxy")))
3560 _exit(rc < 0 ? EXIT_FAILURE : EXIT_SUCCESS);
3562 set_process_info("proxying TLS connection for continued transport");
3566 time_t time_left = timeout;
3567 time_t time_start = time(NULL);
3572 rc = poll(p, 2, time_left * 1000);
3574 if (rc < 0 && errno == EINTR)
3575 if ((time_left -= time(NULL) - time_start) > 0) continue;
3579 DEBUG(D_transport) if (rc == 0) debug_printf("%s: timed out\n", __FUNCTION__);
3583 /* For errors where not readable, bomb out */
3585 if (p[0].revents & POLLERR || p[1].revents & POLLERR)
3587 DEBUG(D_transport) debug_printf("select: exceptional cond on %s fd\n",
3588 p[0].revents & POLLERR ? "tls" : "proxy");
3589 if (!(p[0].revents & POLLIN || p[1].events & POLLIN))
3591 DEBUG(D_transport) debug_printf("- but also readable; no exit yet\n");
3594 while (rc < 0 || !(p[0].revents & POLLIN || p[1].revents & POLLIN));
3596 /* handle inbound data */
3597 if (p[0].revents & POLLIN)
3598 if ((rc = tls_read(ct_ctx, buf, bsize)) <= 0) /* Expect -1 for EOF; */
3599 { /* that reaps the TLS Close Notify record */
3601 shutdown(pfd[0], SHUT_WR);
3605 for (int nbytes = 0; rc - nbytes > 0; nbytes += i)
3606 if ((i = write(pfd[0], buf + nbytes, rc - nbytes)) < 0) goto done;
3608 /* Handle outbound data. We cannot combine payload and the TLS-close
3609 due to the limitations of the (pipe) channel feeding us. Maybe use a unix-domain
3611 if (p[1].revents & POLLIN)
3612 if ((rc = read(pfd[0], buf, bsize)) <= 0)
3616 # ifdef EXIM_TCP_CORK /* Use _CORK to get TLS Close Notify in FIN segment */
3617 (void) setsockopt(tls_out.active.sock, IPPROTO_TCP, EXIM_TCP_CORK, US &on, sizeof(on));
3619 tls_shutdown_wr(ct_ctx);
3620 send_tls_shutdown = FALSE;
3621 shutdown(tls_out.active.sock, SHUT_WR);
3624 for (int nbytes = 0; rc - nbytes > 0; nbytes += i)
3625 if ((i = tls_write(ct_ctx, buf + nbytes, rc - nbytes, FALSE)) < 0)
3628 while (p[0].fd >= 0 || p[1].fd >= 0);
3631 if (send_tls_shutdown) tls_close(ct_ctx, TLS_SHUTDOWN_NOWAIT);
3633 testharness_pause_ms(100); /* let logging complete */
3634 exim_exit(EXIT_SUCCESS);
3639 /*************************************************
3640 * Deliver address list to given host *
3641 *************************************************/
3643 /* If continue_hostname is not null, we get here only when continuing to
3644 deliver down an existing channel. The channel was passed as the standard
3645 input. TLS is never active on a passed channel; the previous process either
3646 closes it down before passing the connection on, or inserts a TLS-proxy
3647 process and passes on a cleartext conection.
3649 Otherwise, we have to make a connection to the remote host, and do the
3650 initial protocol exchange.
3652 When running as an MUA wrapper, if the sender or any recipient is rejected,
3653 temporarily or permanently, we force failure for all recipients.
3656 addrlist chain of potential addresses to deliver; only those whose
3657 transport_return field is set to PENDING_DEFER are currently
3658 being processed; others should be skipped - they have either
3659 been delivered to an earlier host or IP address, or been
3660 failed by one of them.
3661 host host to deliver to
3662 host_af AF_INET or AF_INET6
3663 defport default TCP/IP port to use if host does not specify, in host
3665 interface interface to bind to, or NULL
3666 tblock transport instance block
3667 message_defer set TRUE if yield is OK, but all addresses were deferred
3668 because of a non-recipient, non-host failure, that is, a
3669 4xx response to MAIL FROM, DATA, or ".". This is a defer
3670 that is specific to the message.
3671 suppress_tls if TRUE, don't attempt a TLS connection - this is set for
3672 a second attempt after TLS initialization fails
3674 Returns: OK - the connection was made and the delivery attempted;
3675 the result for each address is in its data block.
3676 DEFER - the connection could not be made, or something failed
3677 while setting up the SMTP session, or there was a
3678 non-message-specific error, such as a timeout.
3679 ERROR - a filter command is specified for this transport,
3680 and there was a problem setting it up; OR helo_data
3681 or add_headers or authenticated_sender is specified
3682 for this transport, and the string failed to expand
3684 For all non-OK returns the first addr of the list carries the
3685 time taken for the attempt.
3689 smtp_deliver(address_item *addrlist, host_item *host, int host_af, int defport,
3690 uschar *interface, transport_instance *tblock,
3691 BOOL *message_defer, BOOL suppress_tls)
3693 smtp_transport_options_block * ob = SOB tblock->options_block;
3698 uschar *message = NULL;
3699 uschar new_message_id[MESSAGE_ID_LENGTH + 1];
3700 smtp_context * sx = store_get(sizeof(*sx), TRUE); /* tainted, for the data buffers */
3701 BOOL pass_message = FALSE;
3702 #ifdef EXPERIMENTAL_ESMTP_LIMITS
3703 BOOL mail_limit = FALSE;
3708 BOOL tcw_done = FALSE, tcw = FALSE;
3710 *message_defer = FALSE;
3712 memset(sx, 0, sizeof(*sx));
3713 sx->addrlist = addrlist;
3714 sx->conn_args.host = host;
3715 sx->conn_args.host_af = host_af,
3717 sx->conn_args.interface = interface;
3718 sx->helo_data = NULL;
3719 sx->conn_args.tblock = tblock;
3720 /* sx->verify = FALSE; */
3721 gettimeofday(&sx->delivery_start, NULL);
3722 sx->sync_addr = sx->first_addr = addrlist;
3729 /* Get the channel set up ready for a message, MAIL FROM being the next
3730 SMTP command to send. */
3732 if ((rc = smtp_setup_conn(sx, suppress_tls)) != OK)
3734 timesince(&addrlist->delivery_time, &sx->delivery_start);
3740 /* If the connection used DANE, ignore for now any addresses with incompatible
3741 domains. The SNI has to be the domain. Arrange a whole new TCP conn later,
3742 just in case only TLS isn't enough. */
3744 if (sx->conn_args.dane)
3746 const uschar * dane_domain = sx->first_addr->domain;
3748 for (address_item * a = sx->first_addr->next; a; a = a->next)
3749 if ( a->transport_return == PENDING_DEFER
3750 && Ustrcmp(dane_domain, a->domain) != 0)
3752 DEBUG(D_transport) debug_printf("DANE: holding %s for later\n", a->domain);
3754 a->transport_return = DANE;
3759 /* If there is a filter command specified for this transport, we can now
3760 set it up. This cannot be done until the identity of the host is known. */
3762 if (tblock->filter_command)
3764 transport_filter_timeout = tblock->filter_timeout;
3766 /* On failure, copy the error to all addresses, abandon the SMTP call, and
3769 if (!transport_set_up_command(&transport_filter_argv,
3770 tblock->filter_command, TRUE, DEFER, addrlist,
3771 string_sprintf("%.50s transport", tblock->name), NULL))
3773 set_errno_nohost(addrlist->next, addrlist->basic_errno, addrlist->message, DEFER,
3774 FALSE, &sx->delivery_start);
3779 if ( transport_filter_argv
3780 && *transport_filter_argv
3781 && **transport_filter_argv
3782 && sx->peer_offered & OPTION_CHUNKING
3783 #ifndef DISABLE_DKIM
3784 /* When dkim signing, chunking is handled even with a transport-filter */
3785 && !(ob->dkim.dkim_private_key && ob->dkim.dkim_domain && ob->dkim.dkim_selector)
3786 && !ob->dkim.force_bodyhash
3790 sx->peer_offered &= ~OPTION_CHUNKING;
3791 DEBUG(D_transport) debug_printf("CHUNKING not usable due to transport filter\n");
3795 /* For messages that have more than the maximum number of envelope recipients,
3796 we want to send several transactions down the same SMTP connection. (See
3797 comments in deliver.c as to how this reconciles, heuristically, with
3798 remote_max_parallel.) This optimization was added to Exim after the following
3799 code was already working. The simplest way to put it in without disturbing the
3800 code was to use a goto to jump back to this point when there is another
3801 transaction to handle. */
3804 sx->from_addr = return_path;
3805 sx->sync_addr = sx->first_addr;
3807 sx->send_rset = TRUE;
3808 sx->completed_addr = FALSE;
3811 /* If we are a continued-connection-after-verify the MAIL and RCPT
3812 commands were already sent; do not re-send but do mark the addrs as
3813 having been accepted up to RCPT stage. A traditional cont-conn
3814 always has a sequence number greater than one. */
3816 if (continue_hostname && continue_sequence == 1)
3818 /* sx->pending_MAIL = FALSE; */
3820 /* sx->next_addr = NULL; */
3822 for (address_item * addr = addrlist; addr; addr = addr->next)
3823 addr->transport_return = PENDING_OK;
3827 /* Initiate a message transfer. */
3829 switch(smtp_write_mail_and_rcpt_cmds(sx, &yield))
3832 case -1: case -2: goto RESPONSE_FAILED;
3833 case -3: goto END_OFF;
3834 case -4: goto SEND_QUIT;
3835 default: goto SEND_FAILED;
3838 /* If we are an MUA wrapper, abort if any RCPTs were rejected, either
3839 permanently or temporarily. We should have flushed and synced after the last
3847 for (a = sx->first_addr, cnt = 0; a && cnt < sx->max_rcpt; a = a->next, cnt++)
3848 if (a->transport_return != PENDING_OK)
3850 /*XXX could we find a better errno than 0 here? */
3851 set_errno_nohost(addrlist, 0, a->message, FAIL,
3852 testflag(a, af_pass_message), &sx->delivery_start);
3859 /* If ok is TRUE, we know we have got at least one good recipient, and must now
3860 send DATA, but if it is FALSE (in the normal, non-wrapper case), we may still
3861 have a good recipient buffered up if we are pipelining. We don't want to waste
3862 time sending DATA needlessly, so we only send it if either ok is TRUE or if we
3863 are pipelining. The responses are all handled by sync_responses().
3864 If using CHUNKING, do not send a BDAT until we know how big a chunk we want
3867 if ( !(sx->peer_offered & OPTION_CHUNKING)
3868 && (sx->ok || (pipelining_active && !mua_wrapper)))
3870 int count = smtp_write_command(sx, SCMD_FLUSH, "DATA\r\n");
3872 if (count < 0) goto SEND_FAILED;
3873 switch(sync_responses(sx, count, sx->ok ? +1 : -1))
3875 case 3: sx->ok = TRUE; /* 2xx & 5xx => OK & progress made */
3876 case 2: sx->completed_addr = TRUE; /* 5xx (only) => progress made */
3879 case 1: sx->ok = TRUE; /* 2xx (only) => OK, but if LMTP, */
3880 if (!sx->lmtp) sx->completed_addr = TRUE; /* can't tell about progress yet */
3881 case 0: break; /* No 2xx or 5xx, but no probs */
3883 case -1: goto END_OFF; /* Timeout on RCPT */
3885 #ifndef DISABLE_PIPE_CONNECT
3886 case -5: /* TLS first-read error */
3887 case -4: HDEBUG(D_transport)
3888 debug_printf("failed reaping pipelined cmd responses\n");
3890 default: goto RESPONSE_FAILED; /* I/O error, or any MAIL/DATA error */
3892 pipelining_active = FALSE;
3893 data_command = string_copy(big_buffer); /* Save for later error message */
3896 /* If there were no good recipients (but otherwise there have been no
3897 problems), just set ok TRUE, since we have handled address-specific errors
3898 already. Otherwise, it's OK to send the message. Use the check/escape mechanism
3899 for handling the SMTP dot-handling protocol, flagging to apply to headers as
3900 well as body. Set the appropriate timeout value to be used for each chunk.
3901 (Haven't been able to make it work using select() for writing yet.) */
3904 && (!(sx->peer_offered & OPTION_CHUNKING) || !pipelining_active))
3906 /* Save the first address of the next batch. */
3907 sx->first_addr = sx->next_addr;
3913 transport_ctx tctx = {
3914 .u = {.fd = sx->cctx.sock}, /*XXX will this need TLS info? */
3917 .check_string = US".",
3918 .escape_string = US"..", /* Escaping strings */
3920 topt_use_crlf | topt_escape_headers
3921 | (tblock->body_only ? topt_no_headers : 0)
3922 | (tblock->headers_only ? topt_no_body : 0)
3923 | (tblock->return_path_add ? topt_add_return_path : 0)
3924 | (tblock->delivery_date_add ? topt_add_delivery_date : 0)
3925 | (tblock->envelope_to_add ? topt_add_envelope_to : 0)
3928 /* If using CHUNKING we need a callback from the generic transport
3929 support to us, for the sending of BDAT smtp commands and the reaping
3930 of responses. The callback needs a whole bunch of state so set up
3931 a transport-context structure to be passed around. */
3933 if (sx->peer_offered & OPTION_CHUNKING)
3935 tctx.check_string = tctx.escape_string = NULL;
3936 tctx.options |= topt_use_bdat;
3937 tctx.chunk_cb = smtp_chunk_cmd_callback;
3938 sx->pending_BDAT = FALSE;
3939 sx->good_RCPT = sx->ok;
3941 tctx.smtp_context = sx;
3944 tctx.options |= topt_end_dot;
3946 /* Save the first address of the next batch. */
3947 sx->first_addr = sx->next_addr;
3949 /* Responses from CHUNKING commands go in buffer. Otherwise,
3950 there has not been a response. */
3954 sigalrm_seen = FALSE;
3955 transport_write_timeout = ob->data_timeout;
3956 smtp_command = US"sending data block"; /* For error messages */
3957 DEBUG(D_transport|D_v)
3958 if (sx->peer_offered & OPTION_CHUNKING)
3959 debug_printf(" will write message using CHUNKING\n");
3961 debug_printf(" SMTP>> writing message and terminating \".\"\n");
3962 transport_count = 0;
3964 #ifndef DISABLE_DKIM
3966 # ifdef MEASURE_TIMING
3968 gettimeofday(&t0, NULL);
3970 dkim_exim_sign_init();
3971 # ifdef EXPERIMENTAL_ARC
3973 uschar * s = ob->arc_sign;
3976 if (!(ob->dkim.arc_signspec = s = expand_string(s)))
3978 if (!f.expand_string_forcedfail)
3980 message = US"failed to expand arc_sign";
3987 /* Ask dkim code to hash the body for ARC */
3988 (void) arc_ams_setup_sign_bodyhash();
3989 ob->dkim.force_bodyhash = TRUE;
3994 # ifdef MEASURE_TIMING
3995 report_time_since(&t0, US"dkim_exim_sign_init (delta)");
4000 /* See if we can pipeline QUIT. Reasons not to are
4001 - pipelining not active
4002 - not ok to send quit
4003 - errors in amtp transation responses
4004 - more addrs to send for this message or this host
4005 - this message was being retried
4006 - more messages for this host
4007 If we can, we want the message-write to not flush (the tail end of) its data out. */
4009 if ( sx->pipelining_used
4010 && (sx->ok && sx->completed_addr || sx->peer_offered & OPTION_CHUNKING)
4012 && !(sx->first_addr || f.continue_more)
4013 && f.deliver_firsttime
4016 smtp_compare_t t_compare =
4017 {.tblock = tblock, .current_sender_address = sender_address};
4022 ( tls_out.active.sock < 0 && !continue_proxy_cipher
4023 || verify_check_given_host(CUSS &ob->hosts_nopass_tls, host) != OK
4027 transport_check_waiting(tblock->name, host->name,
4028 tblock->connection_max_messages, new_message_id,
4029 (oicf)smtp_are_same_identities, (void*)&t_compare);
4032 HDEBUG(D_transport) debug_printf("will pipeline QUIT\n");
4033 tctx.options |= topt_no_flush;
4037 #ifndef DISABLE_DKIM
4038 sx->ok = dkim_transport_write_message(&tctx, &ob->dkim, CUSS &message);
4040 sx->ok = transport_write_message(&tctx, 0);
4043 /* transport_write_message() uses write() because it is called from other
4044 places to write to non-sockets. This means that under some OS (e.g. Solaris)
4045 it can exit with "Broken pipe" as its error. This really means that the
4046 socket got closed at the far end. */
4048 transport_write_timeout = 0; /* for subsequent transports */
4050 /* Failure can either be some kind of I/O disaster (including timeout),
4051 or the failure of a transport filter or the expansion of added headers.
4052 Or, when CHUNKING, it can be a protocol-detected failure. */
4055 if (message) goto SEND_FAILED;
4056 else goto RESPONSE_FAILED;
4058 /* We used to send the terminating "." explicitly here, but because of
4059 buffering effects at both ends of TCP/IP connections, you don't gain
4060 anything by keeping it separate, so it might as well go in the final
4061 data buffer for efficiency. This is now done by setting the topt_end_dot
4064 smtp_command = US"end of data";
4066 /* If we can pipeline a QUIT with the data them send it now. If a new message
4067 for this host appeared in the queue while data was being sent, we will not see
4068 it and it will have to wait for a queue run. If there was one but another
4069 thread took it, we might attempt to send it - but locking of spoolfiles will
4070 detect that. Use _MORE to get QUIT in FIN segment. */
4072 if (tcw_done && !tcw)
4074 /*XXX jgh 2021/03/10 google et. al screwup. G, at least, sends TCP FIN in response to TLS
4075 close-notify. Under TLS 1.3, violating RFC.
4076 However, TLS 1.2 does not have half-close semantics. */
4078 if ( sx->cctx.tls_ctx
4079 #if 0 && !defined(DISABLE_TLS)
4080 && Ustrcmp(tls_out.ver, "TLS1.3") != 0
4082 || !f.deliver_firsttime
4084 { /* Send QUIT now and not later */
4085 (void)smtp_write_command(sx, SCMD_FLUSH, "QUIT\r\n");
4086 sx->send_quit = FALSE;
4089 { /* add QUIT to the output buffer */
4090 (void)smtp_write_command(sx, SCMD_MORE, "QUIT\r\n");
4091 sx->send_quit = FALSE; /* avoid sending it later */
4094 if (sx->cctx.tls_ctx) /* need to send TLS Close Notify */
4096 # ifdef EXIM_TCP_CORK /* Use _CORK to get Close Notify in FIN segment */
4097 (void) setsockopt(sx->cctx.sock, IPPROTO_TCP, EXIM_TCP_CORK, US &on, sizeof(on));
4099 tls_shutdown_wr(sx->cctx.tls_ctx);
4100 sx->send_tlsclose = FALSE; /* avoid later repeat */
4103 HDEBUG(D_transport|D_acl|D_v) debug_printf_indent(" SMTP(shutdown)>>\n");
4104 shutdown(sx->cctx.sock, SHUT_WR); /* flush output buffer, with TCP FIN */
4108 if (sx->peer_offered & OPTION_CHUNKING && sx->cmd_count > 1)
4110 /* Reap any outstanding MAIL & RCPT commands, but not a DATA-go-ahead */
4111 switch(sync_responses(sx, sx->cmd_count-1, 0))
4113 case 3: sx->ok = TRUE; /* 2xx & 5xx => OK & progress made */
4114 case 2: sx->completed_addr = TRUE; /* 5xx (only) => progress made */
4117 case 1: sx->ok = TRUE; /* 2xx (only) => OK, but if LMTP, */
4118 if (!sx->lmtp) sx->completed_addr = TRUE; /* can't tell about progress yet */
4119 case 0: break; /* No 2xx or 5xx, but no probs */
4121 case -1: goto END_OFF; /* Timeout on RCPT */
4123 #ifndef DISABLE_PIPE_CONNECT
4124 case -5: /* TLS first-read error */
4125 case -4: HDEBUG(D_transport)
4126 debug_printf("failed reaping pipelined cmd responses\n");
4128 default: goto RESPONSE_FAILED; /* I/O error, or any MAIL/DATA error */
4132 #ifndef DISABLE_PRDR
4133 /* For PRDR we optionally get a partial-responses warning followed by the
4134 individual responses, before going on with the overall response. If we don't
4135 get the warning then deal with per non-PRDR. */
4139 sx->ok = smtp_read_response(sx, sx->buffer, sizeof(sx->buffer), '3', ob->final_timeout);
4140 if (!sx->ok && errno == 0) switch(sx->buffer[0])
4142 case '2': sx->prdr_active = FALSE;
4145 case '4': errno = ERRNO_DATA4XX;
4146 addrlist->more_errno |=
4147 ((sx->buffer[1] - '0')*10 + sx->buffer[2] - '0') << 8;
4154 /* For non-PRDR SMTP, we now read a single response that applies to the
4155 whole message. If it is OK, then all the addresses have been delivered. */
4159 sx->ok = smtp_read_response(sx, sx->buffer, sizeof(sx->buffer), '2',
4161 if (!sx->ok && errno == 0 && sx->buffer[0] == '4')
4163 errno = ERRNO_DATA4XX;
4164 addrlist->more_errno |= ((sx->buffer[1] - '0')*10 + sx->buffer[2] - '0') << 8;
4168 /* For LMTP, we get back a response for every RCPT command that we sent;
4169 some may be accepted and some rejected. For those that get a response, their
4170 status is fixed; any that are accepted have been handed over, even if later
4171 responses crash - at least, that's how I read RFC 2033.
4173 If all went well, mark the recipient addresses as completed, record which
4174 host/IPaddress they were delivered to, and cut out RSET when sending another
4175 message down the same channel. Write the completed addresses to the journal
4176 now so that they are recorded in case there is a crash of hardware or
4177 software before the spool gets updated. Also record the final SMTP
4178 confirmation if needed (for SMTP only). */
4183 struct timeval delivery_time;
4185 uschar * conf = NULL;
4187 timesince(&delivery_time, &sx->delivery_start);
4188 sx->send_rset = FALSE;
4189 pipelining_active = FALSE;
4191 /* Set up confirmation if needed - applies only to SMTP */
4194 #ifdef DISABLE_EVENT
4195 LOGGING(smtp_confirmation) &&
4200 const uschar * s = string_printing(sx->buffer);
4201 /* deconst cast ok here as string_printing was checked to have alloc'n'copied */
4202 conf = s == sx->buffer ? US string_copy(s) : US s;
4205 /* Process all transported addresses - for LMTP or PRDR, read a status for
4206 each one. We used to drop out at first_addr, until someone returned a 452
4207 followed by a 250... and we screwed up the accepted addresses. */
4209 for (address_item * addr = addrlist; addr; addr = addr->next)
4211 if (addr->transport_return != PENDING_OK) continue;
4213 /* LMTP - if the response fails badly (e.g. timeout), use it for all the
4214 remaining addresses. Otherwise, it's a return code for just the one
4215 address. For temporary errors, add a retry item for the address so that
4216 it doesn't get tried again too soon. */
4218 #ifndef DISABLE_PRDR
4219 if (sx->lmtp || sx->prdr_active)
4224 if (!smtp_read_response(sx, sx->buffer, sizeof(sx->buffer), '2',
4227 if (errno != 0 || sx->buffer[0] == 0) goto RESPONSE_FAILED;
4228 addr->message = string_sprintf(
4229 #ifndef DISABLE_PRDR
4230 "%s error after %s: %s", sx->prdr_active ? "PRDR":"LMTP",
4232 "LMTP error after %s: %s",
4234 data_command, string_printing(sx->buffer));
4235 setflag(addr, af_pass_message); /* Allow message to go to user */
4236 if (sx->buffer[0] == '5')
4237 addr->transport_return = FAIL;
4240 errno = ERRNO_DATA4XX;
4241 addr->more_errno |= ((sx->buffer[1] - '0')*10 + sx->buffer[2] - '0') << 8;
4242 addr->transport_return = DEFER;
4243 #ifndef DISABLE_PRDR
4244 if (!sx->prdr_active)
4246 retry_add_item(addr, addr->address_retry_key, 0);
4250 sx->completed_addr = TRUE; /* NOW we can set this flag */
4251 if (LOGGING(smtp_confirmation))
4253 const uschar *s = string_printing(sx->buffer);
4254 /* deconst cast ok here as string_printing was checked to have alloc'n'copied */
4255 conf = (s == sx->buffer) ? US string_copy(s) : US s;
4259 /* SMTP, or success return from LMTP for this address. Pass back the
4260 actual host that was used. */
4262 addr->transport_return = OK;
4263 addr->host_used = host;
4264 addr->delivery_time = delivery_time;
4265 addr->special_action = flag;
4266 addr->message = conf;
4268 if (tcp_out_fastopen)
4270 setflag(addr, af_tcp_fastopen_conn);
4271 if (tcp_out_fastopen >= TFO_USED_NODATA) setflag(addr, af_tcp_fastopen);
4272 if (tcp_out_fastopen >= TFO_USED_DATA) setflag(addr, af_tcp_fastopen_data);
4274 if (sx->pipelining_used) setflag(addr, af_pipelining);
4275 #ifndef DISABLE_PIPE_CONNECT
4276 if (sx->early_pipe_active) setflag(addr, af_early_pipe);
4278 #ifndef DISABLE_PRDR
4279 if (sx->prdr_active) setflag(addr, af_prdr_used);
4281 if (sx->peer_offered & OPTION_CHUNKING) setflag(addr, af_chunking_used);
4284 #ifndef DISABLE_PRDR
4285 if (!sx->prdr_active)
4288 /* Update the journal. For homonymic addresses, use the base address plus
4289 the transport name. See lots of comments in deliver.c about the reasons
4290 for the complications when homonyms are involved. Just carry on after
4291 write error, as it may prove possible to update the spool file later. */
4293 if (testflag(addr, af_homonym))
4294 sprintf(CS sx->buffer, "%.500s/%s\n", addr->unique + 3, tblock->name);
4296 sprintf(CS sx->buffer, "%.500s\n", addr->unique);
4298 DEBUG(D_deliver) debug_printf("S:journalling %s", sx->buffer);
4299 len = Ustrlen(CS sx->buffer);
4300 if (write(journal_fd, sx->buffer, len) != len)
4301 log_write(0, LOG_MAIN|LOG_PANIC, "failed to write journal for "
4302 "%s: %s", sx->buffer, strerror(errno));
4306 #ifndef DISABLE_PRDR
4307 if (sx->prdr_active)
4309 const uschar * overall_message;
4311 /* PRDR - get the final, overall response. For any non-success
4312 upgrade all the address statuses. */
4314 sx->ok = smtp_read_response(sx, sx->buffer, sizeof(sx->buffer), '2',
4318 if(errno == 0 && sx->buffer[0] == '4')
4320 errno = ERRNO_DATA4XX;
4321 addrlist->more_errno |= ((sx->buffer[1] - '0')*10 + sx->buffer[2] - '0') << 8;
4323 for (address_item * addr = addrlist; addr != sx->first_addr; addr = addr->next)
4324 if (sx->buffer[0] == '5' || addr->transport_return == OK)
4325 addr->transport_return = PENDING_OK; /* allow set_errno action */
4326 goto RESPONSE_FAILED;
4329 /* Append the overall response to the individual PRDR response for logging
4330 and update the journal, or setup retry. */
4332 overall_message = string_printing(sx->buffer);
4333 for (address_item * addr = addrlist; addr != sx->first_addr; addr = addr->next)
4334 if (addr->transport_return == OK)
4335 addr->message = string_sprintf("%s\\n%s", addr->message, overall_message);
4337 for (address_item * addr = addrlist; addr != sx->first_addr; addr = addr->next)
4338 if (addr->transport_return == OK)
4340 if (testflag(addr, af_homonym))
4341 sprintf(CS sx->buffer, "%.500s/%s\n", addr->unique + 3, tblock->name);
4343 sprintf(CS sx->buffer, "%.500s\n", addr->unique);
4345 DEBUG(D_deliver) debug_printf("journalling(PRDR) %s\n", sx->buffer);
4346 len = Ustrlen(CS sx->buffer);
4347 if (write(journal_fd, sx->buffer, len) != len)
4348 log_write(0, LOG_MAIN|LOG_PANIC, "failed to write journal for "
4349 "%s: %s", sx->buffer, strerror(errno));
4351 else if (addr->transport_return == DEFER)
4352 /*XXX magic value -2 ? maybe host+message ? */
4353 retry_add_item(addr, addr->address_retry_key, -2);
4357 /* Ensure the journal file is pushed out to disk. */
4359 if (EXIMfsync(journal_fd) < 0)
4360 log_write(0, LOG_MAIN|LOG_PANIC, "failed to fsync journal: %s",
4366 /* Handle general (not specific to one address) failures here. The value of ok
4367 is used to skip over this code on the falling through case. A timeout causes a
4368 deferral. Other errors may defer or fail according to the response code, and
4369 may set up a special errno value, e.g. after connection chopped, which is
4370 assumed if errno == 0 and there is no text in the buffer. If control reaches
4371 here during the setting up phase (i.e. before MAIL FROM) then always defer, as
4372 the problem is not related to this specific message. */
4377 uschar * set_message;
4383 /* Clear send_quit flag if needed. Do not set. */
4384 sx->send_quit &= check_response(host, &save_errno, addrlist->more_errno,
4385 sx->buffer, &code, &message, &pass_message);
4393 message = string_sprintf("smtp send to %s [%s] failed: %s",
4394 host->name, host->address, message ? message : US strerror(save_errno));
4395 sx->send_quit = FALSE;
4403 sx->ok = FALSE; /* For when reached by GOTO */
4404 set_message = message;
4406 /* We want to handle timeouts after MAIL or "." and loss of connection after
4407 "." specially. They can indicate a problem with the sender address or with
4408 the contents of the message rather than a real error on the connection. These
4409 cases are treated in the same way as a 4xx response. This next bit of code
4410 does the classification. */
4417 message_error = TRUE;
4421 message_error = Ustrncmp(smtp_command,"MAIL",4) == 0 ||
4422 Ustrncmp(smtp_command,"end ",4) == 0;
4425 case ERRNO_SMTPCLOSED:
4426 message_error = Ustrncmp(smtp_command,"end ",4) == 0;
4429 #ifndef DISABLE_DKIM
4431 /* DKIM signing failure: avoid thinking we pipelined quit,
4432 just abandon the message and close the socket. */
4434 message_error = FALSE;
4435 # ifndef DISABLE_TLS
4436 if (sx->cctx.tls_ctx)
4438 tls_close(sx->cctx.tls_ctx, TLS_SHUTDOWN_WAIT);
4439 sx->cctx.tls_ctx = NULL;
4445 message_error = FALSE;
4449 /* Handle the cases that are treated as message errors. These are:
4451 (a) negative response or timeout after MAIL
4452 (b) negative response after DATA
4453 (c) negative response or timeout or dropped connection after "."
4454 (d) utf8 support required and not offered
4456 It won't be a negative response or timeout after RCPT, as that is dealt
4457 with separately above. The action in all cases is to set an appropriate
4458 error code for all the addresses, but to leave yield set to OK because the
4459 host itself has not failed. Of course, it might in practice have failed
4460 when we've had a timeout, but if so, we'll discover that at the next
4461 delivery attempt. For a temporary error, set the message_defer flag, and
4462 write to the logs for information if this is not the last host. The error
4463 for the last host will be logged as part of the address's log line. */
4467 if (mua_wrapper) code = '5'; /* Force hard failure in wrapper mode */
4469 /* If there's an errno, the message contains just the identity of
4474 else /* Anything other than 5 is treated as temporary */
4478 message = US string_sprintf("%s: %s", message, strerror(save_errno));
4480 write_logs(host, message, sx->first_addr ? sx->first_addr->basic_errno : 0);
4482 *message_defer = TRUE;
4485 DEBUG(D_transport) if (sx->cctx.sock >= 0)
4488 if (ioctl(sx->cctx.sock, TIOCOUTQ, &n) == 0)
4489 debug_printf("%d bytes remain in socket output buffer\n", n);
4493 /* Otherwise, we have an I/O error or a timeout other than after MAIL or
4494 ".", or some other transportation error. We defer all addresses and yield
4495 DEFER, except for the case of failed add_headers expansion, or a transport
4496 filter failure, when the yield should be ERROR, to stop it trying other
4501 #ifndef DISABLE_PIPE_CONNECT
4502 /* If we were early-pipelinng and the actual EHLO response did not match
4503 the cached value we assumed, we could have detected it and passed a
4504 custom errno through to here. It would be nice to RSET and retry right
4505 away, but to reliably do that we eould need an extra synch point before
4506 we committed to data and that would discard half the gained roundrips.
4507 Or we could summarily drop the TCP connection. but that is also ugly.
4508 Instead, we ignore the possibility (having freshened the cache) and rely
4509 on the server telling us with a nonmessage error if we have tried to
4510 do something it no longer supports. */
4513 yield = (save_errno == ERRNO_CHHEADER_FAIL ||
4514 save_errno == ERRNO_FILTER_FAIL) ? ERROR : DEFER;
4518 set_errno(addrlist, save_errno, set_message, set_rc, pass_message, host,
4519 #ifdef EXPERIMENTAL_DSN_INFO
4520 sx->smtp_greeting, sx->helo_response,
4522 &sx->delivery_start);
4525 /* If all has gone well, send_quit will be set TRUE, implying we can end the
4526 SMTP session tidily. However, if there were too many addresses to send in one
4527 message (indicated by first_addr being non-NULL) we want to carry on with the
4528 rest of them. Also, it is desirable to send more than one message down the SMTP
4529 connection if there are several waiting, provided we haven't already sent so
4530 many as to hit the configured limit. The function transport_check_waiting looks
4531 for a waiting message and returns its id. Then transport_pass_socket tries to
4532 set up a continued delivery by passing the socket on to another process. The
4533 variable send_rset is FALSE if a message has just been successfully transferred.
4535 If we are already sending down a continued channel, there may be further
4536 addresses not yet delivered that are aimed at the same host, but which have not
4537 been passed in this run of the transport. In this case, continue_more will be
4538 true, and all we should do is send RSET if necessary, and return, leaving the
4541 However, if no address was disposed of, i.e. all addresses got 4xx errors, we
4542 do not want to continue with other messages down the same channel, because that
4543 can lead to looping between two or more messages, all with the same,
4544 temporarily failing address(es). [The retry information isn't updated yet, so
4545 new processes keep on trying.] We probably also don't want to try more of this
4546 message's addresses either.
4548 If we have started a TLS session, we have to end it before passing the
4549 connection to a new process. However, not all servers can handle this (Exim
4550 can), so we do not pass such a connection on if the host matches
4551 hosts_nopass_tls. */
4554 debug_printf("ok=%d send_quit=%d send_rset=%d continue_more=%d "
4555 "yield=%d first_address is %sNULL\n", sx->ok, sx->send_quit,
4556 sx->send_rset, f.continue_more, yield, sx->first_addr ? "not " : "");
4558 if (sx->completed_addr && sx->ok && sx->send_quit)
4559 #ifdef EXPERIMENTAL_ESMTP_LIMITS
4560 if (mail_limit = continue_sequence >= sx->max_mail)
4563 debug_printf("reached limit %u for MAILs per conn\n", sx->max_mail);
4568 smtp_compare_t t_compare =
4569 {.tblock = tblock, .current_sender_address = sender_address};
4571 if ( sx->first_addr /* more addrs for this message */
4572 || f.continue_more /* more addrs for continued-host */
4573 || tcw_done && tcw /* more messages for host */
4576 ( tls_out.active.sock < 0 && !continue_proxy_cipher
4577 || verify_check_given_host(CUSS &ob->hosts_nopass_tls, host) != OK
4581 transport_check_waiting(tblock->name, host->name,
4582 sx->max_mail, new_message_id,
4583 (oicf)smtp_are_same_identities, (void*)&t_compare)
4590 if (! (sx->ok = smtp_write_command(sx, SCMD_FLUSH, "RSET\r\n") >= 0))
4592 msg = US string_sprintf("smtp send to %s [%s] failed: %s", host->name,
4593 host->address, strerror(errno));
4594 sx->send_quit = FALSE;
4596 else if (! (sx->ok = smtp_read_response(sx, sx->buffer, sizeof(sx->buffer),
4597 '2', ob->command_timeout)))
4600 sx->send_quit = check_response(host, &errno, 0, sx->buffer, &code, &msg,
4604 DEBUG(D_transport) debug_printf("H=%s [%s] %s\n",
4605 host->name, host->address, msg);
4609 /* Either RSET was not needed, or it succeeded */
4616 int socket_fd = sx->cctx.sock;
4618 if (sx->first_addr) /* More addresses still to be sent */
4619 { /* for this message */
4620 #ifdef EXPERIMENTAL_ESMTP_LIMITS
4621 /* Any that we marked as skipped, reset to do now */
4622 for (address_item * a = sx->first_addr; a; a = a->next)
4623 if (a->transport_return == SKIP)
4624 a->transport_return = PENDING_DEFER;
4626 continue_sequence++; /* for consistency */
4627 clearflag(sx->first_addr, af_new_conn);
4628 setflag(sx->first_addr, af_cont_conn); /* Causes * in logging */
4629 pipelining_active = sx->pipelining_used; /* was cleared at DATA */
4633 /* Unless caller said it already has more messages listed for this host,
4634 pass the connection on to a new Exim process (below, the call to
4635 transport_pass_socket). If the caller has more ready, just return with
4636 the connection still open. */
4639 if (tls_out.active.sock >= 0)
4640 if ( f.continue_more
4641 || verify_check_given_host(CUSS &ob->hosts_noproxy_tls, host) == OK)
4643 /* Before passing the socket on, or returning to caller with it still
4644 open, we must shut down TLS. Not all MTAs allow for the continuation
4645 of the SMTP session when TLS is shut down. We test for this by sending
4646 a new EHLO. If we don't get a good response, we don't attempt to pass
4649 tls_close(sx->cctx.tls_ctx, TLS_SHUTDOWN_WAIT);
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);
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)
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 # ifdef EXIM_TCP_CORK
4807 (void) setsockopt(sx->cctx.sock, IPPROTO_TCP, EXIM_TCP_CORK, US &on, sizeof(on));
4809 tls_close(sx->cctx.tls_ctx, TLS_SHUTDOWN_WAIT);
4810 sx->cctx.tls_ctx = NULL;
4814 if (fcntl(sx->cctx.sock, F_SETFL, O_NONBLOCK) == 0)
4815 for (int i = 16, n; /* drain socket */
4816 (n = read(sx->cctx.sock, sx->inbuffer, sizeof(sx->inbuffer))) > 0 && i > 0;
4817 i--) HDEBUG(D_transport|D_acl|D_v)
4820 debug_printf_indent(" SMTP(drain %d bytes)<< %.*s\n", n, m, sx->inbuffer);
4821 for (m = 0; m < n; m++)
4822 debug_printf("0x%02x\n", sx->inbuffer[m]);
4825 HDEBUG(D_transport|D_acl|D_v) debug_printf_indent(" SMTP(close)>>\n");
4826 (void)close(sx->cctx.sock);
4828 continue_transport = NULL;
4829 continue_hostname = NULL;
4831 #ifndef DISABLE_EVENT
4832 (void) event_raise(tblock->event_action, US"tcp:close", NULL);
4838 sx->first_addr = NULL;
4839 for (address_item * a = sx->addrlist->next; a; a = a->next)
4840 if (a->transport_return == DANE)
4842 a->transport_return = PENDING_DEFER;
4843 if (!sx->first_addr)
4845 /* Remember the new start-point in the addrlist, for smtp_setup_conn()
4846 to get the domain string for SNI */
4849 clearflag(a, af_cont_conn);
4850 setflag(a, af_new_conn); /* clear * from logging */
4851 DEBUG(D_transport) debug_printf("DANE: go-around for %s\n", a->domain);
4854 continue_sequence = 1; /* for consistency */
4859 #ifdef EXPERIMENTAL_ESMTP_LIMITS
4860 if (mail_limit && sx->first_addr)
4862 /* Reset the sequence count since we closed the connection. This is flagged
4863 on the pipe back to the delivery process so that a non-continued-conn delivery
4866 continue_sequence = 1; /* for consistency */
4867 clearflag(sx->first_addr, af_cont_conn);
4868 setflag(sx->first_addr, af_new_conn); /* clear * from logging */
4877 if (dane_held) for (address_item * a = sx->addrlist->next; a; a = a->next)
4878 if (a->transport_return == DANE)
4879 a->transport_return = PENDING_DEFER;
4887 /*************************************************
4888 * Closedown entry point *
4889 *************************************************/
4891 /* This function is called when exim is passed an open smtp channel
4892 from another incarnation, but the message which it has been asked
4893 to deliver no longer exists. The channel is on stdin.
4895 We might do fancy things like looking for another message to send down
4896 the channel, but if the one we sought has gone, it has probably been
4897 delivered by some other process that itself will seek further messages,
4898 so just close down our connection.
4900 Argument: pointer to the transport instance block
4905 smtp_transport_closedown(transport_instance *tblock)
4907 smtp_transport_options_block * ob = SOB tblock->options_block;
4908 client_conn_ctx cctx;
4911 uschar inbuffer[4096];
4912 uschar outbuffer[16];
4914 /*XXX really we need an active-smtp-client ctx, rather than assuming stdout */
4915 cctx.sock = fileno(stdin);
4916 cctx.tls_ctx = cctx.sock == tls_out.active.sock ? tls_out.active.tls_ctx : NULL;
4918 sx.inblock.cctx = &cctx;
4919 sx.inblock.buffer = inbuffer;
4920 sx.inblock.buffersize = sizeof(inbuffer);
4921 sx.inblock.ptr = inbuffer;
4922 sx.inblock.ptrend = inbuffer;
4924 sx.outblock.cctx = &cctx;
4925 sx.outblock.buffersize = sizeof(outbuffer);
4926 sx.outblock.buffer = outbuffer;
4927 sx.outblock.ptr = outbuffer;
4928 sx.outblock.cmd_count = 0;
4929 sx.outblock.authenticating = FALSE;
4931 (void)smtp_write_command(&sx, SCMD_FLUSH, "QUIT\r\n");
4932 (void)smtp_read_response(&sx, buffer, sizeof(buffer), '2', ob->command_timeout);
4933 (void)close(cctx.sock);
4938 /*************************************************
4939 * Prepare addresses for delivery *
4940 *************************************************/
4942 /* This function is called to flush out error settings from previous delivery
4943 attempts to other hosts. It also records whether we got here via an MX record
4944 or not in the more_errno field of the address. We are interested only in
4945 addresses that are still marked DEFER - others may have got delivered to a
4946 previously considered IP address. Set their status to PENDING_DEFER to indicate
4947 which ones are relevant this time.
4950 addrlist the list of addresses
4951 host the host we are delivering to
4953 Returns: the first address for this delivery
4956 static address_item *
4957 prepare_addresses(address_item *addrlist, host_item *host)
4959 address_item *first_addr = NULL;
4960 for (address_item * addr = addrlist; addr; addr = addr->next)
4961 if (addr->transport_return == DEFER)
4963 if (!first_addr) first_addr = addr;
4964 addr->transport_return = PENDING_DEFER;
4965 addr->basic_errno = 0;
4966 addr->more_errno = (host->mx >= 0)? 'M' : 'A';
4967 addr->message = NULL;
4969 addr->cipher = NULL;
4970 addr->ourcert = NULL;
4971 addr->peercert = NULL;
4972 addr->peerdn = NULL;
4973 addr->ocsp = OCSP_NOT_REQ;
4974 addr->tlsver = NULL;
4976 #ifdef EXPERIMENTAL_DSN_INFO
4977 addr->smtp_greeting = NULL;
4978 addr->helo_response = NULL;
4986 /*************************************************
4987 * Main entry point *
4988 *************************************************/
4990 /* See local README for interface details. As this is a remote transport, it is
4991 given a chain of addresses to be delivered in one connection, if possible. It
4992 always returns TRUE, indicating that each address has its own independent
4993 status set, except if there is a setting up problem, in which case it returns
4997 smtp_transport_entry(
4998 transport_instance *tblock, /* data for this instantiation */
4999 address_item *addrlist) /* addresses we are working on */
5002 int hosts_defer = 0;
5004 int hosts_looked_up = 0;
5005 int hosts_retry = 0;
5006 int hosts_serial = 0;
5007 int hosts_total = 0;
5008 int total_hosts_tried = 0;
5009 BOOL expired = TRUE;
5010 uschar *expanded_hosts = NULL;
5012 uschar *tid = string_sprintf("%s transport", tblock->name);
5013 smtp_transport_options_block *ob = SOB tblock->options_block;
5014 host_item *hostlist = addrlist->host_list;
5015 host_item *host = NULL;
5019 debug_printf("%s transport entered\n", tblock->name);
5020 for (address_item * addr = addrlist; addr; addr = addr->next)
5021 debug_printf(" %s\n", addr->address);
5024 debug_printf("hostlist:\n");
5025 for (host_item * host = hostlist; host; host = host->next)
5026 debug_printf(" '%s' IP %s port %d\n", host->name, host->address, host->port);
5028 if (continue_hostname)
5029 debug_printf("already connected to %s [%s] (on fd %d)\n",
5030 continue_hostname, continue_host_address,
5031 cutthrough.cctx.sock >= 0 ? cutthrough.cctx.sock : 0);
5034 /* Check the restrictions on line length */
5036 if (max_received_linelength > ob->message_linelength_limit)
5039 gettimeofday(&now, NULL);
5041 for (address_item * addr = addrlist; addr; addr = addr->next)
5042 if (addr->transport_return == DEFER)
5043 addr->transport_return = PENDING_DEFER;
5045 set_errno_nohost(addrlist, ERRNO_SMTPFORMAT,
5046 US"message has lines too long for transport", FAIL, TRUE, &now);
5050 /* Set the flag requesting that these hosts be added to the waiting
5051 database if the delivery fails temporarily or if we are running with
5052 queue_smtp or a 2-stage queue run. This gets unset for certain
5053 kinds of error, typically those that are specific to the message. */
5055 update_waiting = TRUE;
5057 /* If a host list is not defined for the addresses - they must all have the
5058 same one in order to be passed to a single transport - or if the transport has
5059 a host list with hosts_override set, use the host list supplied with the
5060 transport. It is an error for this not to exist. */
5062 if (!hostlist || (ob->hosts_override && ob->hosts))
5066 addrlist->message = string_sprintf("%s transport called with no hosts set",
5068 addrlist->transport_return = PANIC;
5069 return FALSE; /* Only top address has status */
5072 DEBUG(D_transport) debug_printf("using the transport's hosts: %s\n",
5075 /* If the transport's host list contains no '$' characters, and we are not
5076 randomizing, it is fixed and therefore a chain of hosts can be built once
5077 and for all, and remembered for subsequent use by other calls to this
5078 transport. If, on the other hand, the host list does contain '$', or we are
5079 randomizing its order, we have to rebuild it each time. In the fixed case,
5080 as the hosts string will never be used again, it doesn't matter that we
5081 replace all the : characters with zeros. */
5085 uschar *s = ob->hosts;
5087 if (Ustrchr(s, '$'))
5089 if (!(expanded_hosts = expand_string(s)))
5091 addrlist->message = string_sprintf("failed to expand list of hosts "
5092 "\"%s\" in %s transport: %s", s, tblock->name, expand_string_message);
5093 addrlist->transport_return = f.search_find_defer ? DEFER : PANIC;
5094 return FALSE; /* Only top address has status */
5096 DEBUG(D_transport) debug_printf("expanded list of hosts \"%s\" to "
5097 "\"%s\"\n", s, expanded_hosts);
5101 if (ob->hosts_randomize) s = expanded_hosts = string_copy(s);
5103 if (is_tainted2(s, LOG_MAIN|LOG_PANIC, "Tainted host list '%s' from '%s' in transport %s", s, ob->hosts, tblock->name))
5105 /* Avoid leaking info to an attacker */
5106 addrlist->message = US"internal configuration error";
5107 addrlist->transport_return = PANIC;
5111 host_build_hostlist(&hostlist, s, ob->hosts_randomize);
5113 /* Check that the expansion yielded something useful. */
5117 string_sprintf("%s transport has empty hosts setting", tblock->name);
5118 addrlist->transport_return = PANIC;
5119 return FALSE; /* Only top address has status */
5122 /* If there was no expansion of hosts, save the host list for
5125 if (!expanded_hosts) ob->hostlist = hostlist;
5128 /* This is not the first time this transport has been run in this delivery;
5129 the host list was built previously. */
5132 hostlist = ob->hostlist;
5135 /* The host list was supplied with the address. If hosts_randomize is set, we
5136 must sort it into a random order if it did not come from MX records and has not
5137 already been randomized (but don't bother if continuing down an existing
5140 else if (ob->hosts_randomize && hostlist->mx == MX_NONE && !continue_hostname)
5142 host_item *newlist = NULL;
5145 host_item *h = hostlist;
5146 hostlist = hostlist->next;
5148 h->sort_key = random_number(100);
5155 else if (h->sort_key < newlist->sort_key)
5162 host_item *hh = newlist;
5165 if (h->sort_key < hh->next->sort_key) break;
5173 hostlist = addrlist->host_list = newlist;
5176 /* Sort out the default port. */
5178 if (!smtp_get_port(ob->port, addrlist, &defport, tid)) return FALSE;
5180 /* For each host-plus-IP-address on the list:
5182 . If this is a continued delivery and the host isn't the one with the
5183 current connection, skip.
5185 . If the status is unusable (i.e. previously failed or retry checked), skip.
5187 . If no IP address set, get the address, either by turning the name into
5188 an address, calling gethostbyname if gethostbyname is on, or by calling
5189 the DNS. The DNS may yield multiple addresses, in which case insert the
5190 extra ones into the list.
5192 . Get the retry data if not previously obtained for this address and set the
5193 field which remembers the state of this address. Skip if the retry time is
5194 not reached. If not, remember whether retry data was found. The retry string
5195 contains both the name and the IP address.
5197 . Scan the list of addresses and mark those whose status is DEFER as
5198 PENDING_DEFER. These are the only ones that will be processed in this cycle
5201 . Make a delivery attempt - addresses marked PENDING_DEFER will be tried.
5202 Some addresses may be successfully delivered, others may fail, and yet
5203 others may get temporary errors and so get marked DEFER.
5205 . The return from the delivery attempt is OK if a connection was made and a
5206 valid SMTP dialogue was completed. Otherwise it is DEFER.
5208 . If OK, add a "remove" retry item for this host/IPaddress, if any.
5210 . If fail to connect, or other defer state, add a retry item.
5212 . If there are any addresses whose status is still DEFER, carry on to the
5213 next host/IPaddress, unless we have tried the number of hosts given
5214 by hosts_max_try or hosts_max_try_hardlimit; otherwise return. Note that
5215 there is some fancy logic for hosts_max_try that means its limit can be
5216 overstepped in some circumstances.
5218 If we get to the end of the list, all hosts have deferred at least one address,
5219 or not reached their retry times. If delay_after_cutoff is unset, it requests a
5220 delivery attempt to those hosts whose last try was before the arrival time of
5221 the current message. To cope with this, we have to go round the loop a second
5222 time. After that, set the status and error data for any addresses that haven't
5223 had it set already. */
5225 for (int cutoff_retry = 0;
5226 expired && cutoff_retry < (ob->delay_after_cutoff ? 1 : 2);
5229 host_item *nexthost = NULL;
5230 int unexpired_hosts_tried = 0;
5231 BOOL continue_host_tried = FALSE;
5233 retry_non_continued:
5234 for (host = hostlist;
5236 && unexpired_hosts_tried < ob->hosts_max_try
5237 && total_hosts_tried < ob->hosts_max_try_hardlimit;
5242 BOOL host_is_expired = FALSE;
5243 BOOL message_defer = FALSE;
5244 BOOL some_deferred = FALSE;
5245 address_item *first_addr = NULL;
5246 uschar *interface = NULL;
5247 uschar *retry_host_key = NULL;
5248 uschar *retry_message_key = NULL;
5249 uschar *serialize_key = NULL;
5251 /* Default next host is next host. :-) But this can vary if the
5252 hosts_max_try limit is hit (see below). It may also be reset if a host
5253 address is looked up here (in case the host was multihomed). */
5255 nexthost = host->next;
5257 /* If the address hasn't yet been obtained from the host name, look it up
5258 now, unless the host is already marked as unusable. If it is marked as
5259 unusable, it means that the router was unable to find its IP address (in
5260 the DNS or wherever) OR we are in the 2nd time round the cutoff loop, and
5261 the lookup failed last time. We don't get this far if *all* MX records
5262 point to non-existent hosts; that is treated as a hard error.
5264 We can just skip this host entirely. When the hosts came from the router,
5265 the address will timeout based on the other host(s); when the address is
5266 looked up below, there is an explicit retry record added.
5268 Note that we mustn't skip unusable hosts if the address is not unset; they
5269 may be needed as expired hosts on the 2nd time round the cutoff loop. */
5273 int new_port, flags;
5275 if (host->status >= hstatus_unusable)
5277 DEBUG(D_transport) debug_printf("%s has no address and is unusable - skipping\n",
5282 DEBUG(D_transport) debug_printf("getting address for %s\n", host->name);
5284 /* The host name is permitted to have an attached port. Find it, and
5285 strip it from the name. Just remember it for now. */
5287 new_port = host_item_get_port(host);
5289 /* Count hosts looked up */
5293 /* Find by name if so configured, or if it's an IP address. We don't
5294 just copy the IP address, because we need the test-for-local to happen. */
5296 flags = HOST_FIND_BY_A | HOST_FIND_BY_AAAA;
5297 if (ob->dns_qualify_single) flags |= HOST_FIND_QUALIFY_SINGLE;
5298 if (ob->dns_search_parents) flags |= HOST_FIND_SEARCH_PARENTS;
5300 if (ob->gethostbyname || string_is_ip_address(host->name, NULL) != 0)
5301 rc = host_find_byname(host, NULL, flags, NULL, TRUE);
5303 rc = host_find_bydns(host, NULL, flags, NULL, NULL, NULL,
5304 &ob->dnssec, /* domains for request/require */
5307 /* Update the host (and any additional blocks, resulting from
5308 multihoming) with a host-specific port, if any. */
5310 for (host_item * hh = host; hh != nexthost; hh = hh->next) hh->port = new_port;
5312 /* Failure to find the host at this time (usually DNS temporary failure)
5313 is really a kind of routing failure rather than a transport failure.
5314 Therefore we add a retry item of the routing kind, not to stop us trying
5315 to look this name up here again, but to ensure the address gets timed
5316 out if the failures go on long enough. A complete failure at this point
5317 commonly points to a configuration error, but the best action is still
5318 to carry on for the next host. */
5320 if (rc == HOST_FIND_AGAIN || rc == HOST_FIND_SECURITY || rc == HOST_FIND_FAILED)
5322 retry_add_item(addrlist, string_sprintf("R:%s", host->name), 0);
5324 if (rc == HOST_FIND_AGAIN) hosts_defer++; else hosts_fail++;
5325 DEBUG(D_transport) debug_printf("rc = %s for %s\n", (rc == HOST_FIND_AGAIN)?
5326 "HOST_FIND_AGAIN" : "HOST_FIND_FAILED", host->name);
5327 host->status = hstatus_unusable;
5329 for (address_item * addr = addrlist; addr; addr = addr->next)
5331 if (addr->transport_return != DEFER) continue;
5332 addr->basic_errno = ERRNO_UNKNOWNHOST;
5333 addr->message = string_sprintf(
5334 rc == HOST_FIND_SECURITY
5335 ? "lookup of IP address for %s was insecure"
5336 : "failed to lookup IP address for %s",
5342 /* If the host is actually the local host, we may have a problem, or
5343 there may be some cunning configuration going on. In the problem case,
5344 log things and give up. The default transport status is already DEFER. */
5346 if (rc == HOST_FOUND_LOCAL && !ob->allow_localhost)
5348 for (address_item * addr = addrlist; addr; addr = addr->next)
5350 addr->basic_errno = ERRNO_HOST_IS_LOCAL;
5351 addr->message = string_sprintf("%s transport found host %s to be "
5352 "local", tblock->name, host->name);
5356 } /* End of block for IP address lookup */
5358 /* If this is a continued delivery, we are interested only in the host
5359 which matches the name of the existing open channel. The check is put
5360 here after the local host lookup, in case the name gets expanded as a
5361 result of the lookup. Set expired FALSE, to save the outer loop executing
5364 if (continue_hostname)
5365 if ( Ustrcmp(continue_hostname, host->name) != 0
5366 || Ustrcmp(continue_host_address, host->address) != 0
5370 continue; /* With next host */
5373 continue_host_tried = TRUE;
5375 /* Reset the default next host in case a multihomed host whose addresses
5376 are not looked up till just above added to the host list. */
5378 nexthost = host->next;
5380 /* If queue_smtp is set (-odqs or the first part of a 2-stage run), or the
5381 domain is in queue_smtp_domains, we don't actually want to attempt any
5382 deliveries. When doing a queue run, queue_smtp_domains is always unset. If
5383 there is a lookup defer in queue_smtp_domains, proceed as if the domain
5384 were not in it. We don't want to hold up all SMTP deliveries! Except when
5385 doing a two-stage queue run, don't do this if forcing. */
5387 if ( (!f.deliver_force || f.queue_2stage)
5389 || match_isinlist(addrlist->domain,
5390 CUSS &queue_smtp_domains, 0,
5391 &domainlist_anchor, NULL, MCL_DOMAIN, TRUE, NULL) == OK)
5394 DEBUG(D_transport) debug_printf("first-pass routing only\n");
5396 for (address_item * addr = addrlist; addr; addr = addr->next)
5397 if (addr->transport_return == DEFER)
5398 addr->message = US"first-pass only routing due to -odqs, "
5399 "queue_smtp_domains or control=queue";
5400 continue; /* With next host */
5403 /* Count hosts being considered - purely for an intelligent comment
5404 if none are usable. */
5408 /* Set $host and $host address now in case they are needed for the
5409 interface expansion or the serialize_hosts check; they remain set if an
5410 actual delivery happens. */
5412 deliver_host = host->name;
5413 deliver_host_address = host->address;
5414 lookup_dnssec_authenticated = host->dnssec == DS_YES ? US"yes"
5415 : host->dnssec == DS_NO ? US"no"
5418 /* Set up a string for adding to the retry key if the port number is not
5419 the standard SMTP port. A host may have its own port setting that overrides
5422 pistring = string_sprintf(":%d", host->port == PORT_NONE
5423 ? defport : host->port);
5424 if (Ustrcmp(pistring, ":25") == 0) pistring = US"";
5426 /* Select IPv4 or IPv6, and choose an outgoing interface. If the interface
5427 string is set, even if constant (as different transports can have different
5428 constant settings), we must add it to the key that is used for retries,
5429 because connections to the same host from a different interface should be
5430 treated separately. */
5432 host_af = Ustrchr(host->address, ':') ? AF_INET6 : AF_INET;
5434 uschar * s = ob->interface;
5437 if (!smtp_get_interface(s, host_af, addrlist, &interface, tid))
5439 pistring = string_sprintf("%s/%s", pistring, interface);
5443 /* The first time round the outer loop, check the status of the host by
5444 inspecting the retry data. The second time round, we are interested only
5445 in expired hosts that haven't been tried since this message arrived. */
5447 if (cutoff_retry == 0)
5450 /* Ensure the status of the address is set by checking retry data if
5451 necessary. There may be host-specific retry data (applicable to all
5452 messages) and also data for retries of a specific message at this host.
5453 If either of these retry records are actually read, the keys used are
5454 returned to save recomputing them later. */
5456 if (exp_bool(addrlist, US"transport", tblock->name, D_transport,
5457 US"retry_include_ip_address", ob->retry_include_ip_address,
5458 ob->expand_retry_include_ip_address, &incl_ip) != OK)
5459 continue; /* with next host */
5461 host_is_expired = retry_check_address(addrlist->domain, host, pistring,
5462 incl_ip, &retry_host_key, &retry_message_key);
5464 DEBUG(D_transport) debug_printf("%s [%s]%s retry-status = %s\n", host->name,
5465 host->address ? host->address : US"", pistring,
5466 host->status == hstatus_usable ? "usable"
5467 : host->status == hstatus_unusable ? "unusable"
5468 : host->status == hstatus_unusable_expired ? "unusable (expired)" : "?");
5470 /* Skip this address if not usable at this time, noting if it wasn't
5471 actually expired, both locally and in the address. */
5473 switch (host->status)
5475 case hstatus_unusable:
5477 setflag(addrlist, af_retry_skipped);
5480 case hstatus_unusable_expired:
5483 case hwhy_retry: hosts_retry++; break;
5484 case hwhy_failed: hosts_fail++; break;
5486 case hwhy_deferred: hosts_defer++; break;
5489 /* If there was a retry message key, implying that previously there
5490 was a message-specific defer, we don't want to update the list of
5491 messages waiting for these hosts. */
5493 if (retry_message_key) update_waiting = FALSE;
5494 continue; /* With the next host or IP address */
5498 /* Second time round the loop: if the address is set but expired, and
5499 the message is newer than the last try, let it through. */
5504 || host->status != hstatus_unusable_expired
5505 || host->last_try > received_time.tv_sec)
5507 DEBUG(D_transport) debug_printf("trying expired host %s [%s]%s\n",
5508 host->name, host->address, pistring);
5509 host_is_expired = TRUE;
5512 /* Setting "expired=FALSE" doesn't actually mean not all hosts are expired;
5513 it remains TRUE only if all hosts are expired and none are actually tried.
5518 /* If this host is listed as one to which access must be serialized,
5519 see if another Exim process has a connection to it, and if so, skip
5520 this host. If not, update the database to record our connection to it
5521 and remember this for later deletion. Do not do any of this if we are
5522 sending the message down a pre-existing connection. */
5524 if ( !continue_hostname
5525 && verify_check_given_host(CUSS &ob->serialize_hosts, host) == OK)
5527 serialize_key = string_sprintf("host-serialize-%s", host->name);
5528 if (!enq_start(serialize_key, 1))
5531 debug_printf("skipping host %s because another Exim process "
5532 "is connected to it\n", host->name);
5538 /* OK, we have an IP address that is not waiting for its retry time to
5539 arrive (it might be expired) OR (second time round the loop) we have an
5540 expired host that hasn't been tried since the message arrived. Have a go
5541 at delivering the message to it. First prepare the addresses by flushing
5542 out the result of previous attempts, and finding the first address that
5543 is still to be delivered. */
5545 first_addr = prepare_addresses(addrlist, host);
5547 DEBUG(D_transport) debug_printf("delivering %s to %s [%s] (%s%s)\n",
5548 message_id, host->name, host->address, addrlist->address,
5549 addrlist->next ? ", ..." : "");
5551 set_process_info("delivering %s to %s [%s]%s (%s%s)",
5552 message_id, host->name, host->address, pistring, addrlist->address,
5553 addrlist->next ? ", ..." : "");
5555 /* This is not for real; don't do the delivery. If there are
5556 any remaining hosts, list them. */
5561 gettimeofday(&now, NULL);
5562 set_errno_nohost(addrlist, 0, NULL, OK, FALSE, &now);
5563 for (address_item * addr = addrlist; addr; addr = addr->next)
5565 addr->host_used = host;
5566 addr->special_action = '*';
5567 addr->message = US"delivery bypassed by -N option";
5571 debug_printf("*** delivery by %s transport bypassed by -N option\n"
5572 "*** host and remaining hosts:\n", tblock->name);
5573 for (host_item * host2 = host; host2; host2 = host2->next)
5574 debug_printf(" %s [%s]\n", host2->name,
5575 host2->address ? host2->address : US"unset");
5580 /* This is for real. If the host is expired, we don't count it for
5581 hosts_max_retry. This ensures that all hosts must expire before an address
5582 is timed out, unless hosts_max_try_hardlimit (which protects against
5583 lunatic DNS configurations) is reached.
5585 If the host is not expired and we are about to hit the hosts_max_retry
5586 limit, check to see if there is a subsequent hosts with a different MX
5587 value. If so, make that the next host, and don't count this one. This is a
5588 heuristic to make sure that different MXs do get tried. With a normal kind
5589 of retry rule, they would get tried anyway when the earlier hosts were
5590 delayed, but if the domain has a "retry every time" type of rule - as is
5591 often used for the the very large ISPs, that won't happen. */
5596 /* Make a copy of the host if it is local to this invocation
5597 of the transport. */
5601 thost = store_get(sizeof(host_item), FALSE);
5603 thost->name = string_copy(host->name);
5604 thost->address = string_copy(host->address);
5609 if (!host_is_expired && ++unexpired_hosts_tried >= ob->hosts_max_try)
5612 debug_printf("hosts_max_try limit reached with this host\n");
5613 for (host_item * h = host; h; h = h->next) if (h->mx != host->mx)
5616 unexpired_hosts_tried--;
5617 DEBUG(D_transport) debug_printf("however, a higher MX host exists "
5618 "and will be tried\n");
5623 /* Attempt the delivery. */
5625 total_hosts_tried++;
5626 rc = smtp_deliver(addrlist, thost, host_af, defport, interface, tblock,
5627 &message_defer, FALSE);
5630 OK => connection made, each address contains its result;
5631 message_defer is set for message-specific defers (when all
5632 recipients are marked defer)
5633 DEFER => there was a non-message-specific delivery problem;
5634 ERROR => there was a problem setting up the arguments for a filter,
5635 or there was a problem with expanding added headers
5638 /* If the result is not OK, there was a non-message-specific problem.
5639 If the result is DEFER, we need to write to the logs saying what happened
5640 for this particular host, except in the case of authentication and TLS
5641 failures, where the log has already been written. If all hosts defer a
5642 general message is written at the end. */
5644 if (rc == DEFER && first_addr->basic_errno != ERRNO_AUTHFAIL
5645 && first_addr->basic_errno != ERRNO_TLSFAILURE)
5646 write_logs(host, first_addr->message, first_addr->basic_errno);
5648 #ifndef DISABLE_EVENT
5650 deferred_event_raise(first_addr, host, US"msg:host:defer");
5653 /* If STARTTLS was accepted, but there was a failure in setting up the
5654 TLS session (usually a certificate screwup), and the host is not in
5655 hosts_require_tls, and tls_tempfail_tryclear is true, try again, with
5656 TLS forcibly turned off. We have to start from scratch with a new SMTP
5657 connection. That's why the retry is done from here, not from within
5658 smtp_deliver(). [Rejections of STARTTLS itself don't screw up the
5659 session, so the in-clear transmission after those errors, if permitted,
5660 happens inside smtp_deliver().] */
5664 && first_addr->basic_errno == ERRNO_TLSFAILURE
5665 && ob->tls_tempfail_tryclear
5666 && verify_check_given_host(CUSS &ob->hosts_require_tls, host) != OK
5669 log_write(0, LOG_MAIN,
5670 "%s: delivering unencrypted to H=%s [%s] (not in hosts_require_tls)",
5671 first_addr->message, host->name, host->address);
5672 first_addr = prepare_addresses(addrlist, host);
5673 rc = smtp_deliver(addrlist, thost, host_af, defport, interface, tblock,
5674 &message_defer, TRUE);
5675 if (rc == DEFER && first_addr->basic_errno != ERRNO_AUTHFAIL)
5676 write_logs(host, first_addr->message, first_addr->basic_errno);
5677 # ifndef DISABLE_EVENT
5679 deferred_event_raise(first_addr, host, US"msg:host:defer");
5682 #endif /*DISABLE_TLS*/
5684 #ifndef DISABLE_EVENT
5685 /* If the last host gave a defer raise a per-message event */
5688 && unexpired_hosts_tried < ob->hosts_max_try
5689 && total_hosts_tried < ob->hosts_max_try_hardlimit
5691 && (message_defer || rc == DEFER)
5693 deferred_event_raise(first_addr, host, US"msg:defer");
5697 /* Delivery attempt finished */
5699 set_process_info("delivering %s: just tried %s [%s]%s for %s%s: result %s",
5700 message_id, host->name, host->address, pistring, addrlist->address,
5701 addrlist->next ? " (& others)" : "", rc_to_string(rc));
5703 /* Release serialization if set up */
5705 if (serialize_key) enq_end(serialize_key);
5707 /* If the result is DEFER, or if a host retry record is known to exist, we
5708 need to add an item to the retry chain for updating the retry database
5709 at the end of delivery. We only need to add the item to the top address,
5710 of course. Also, if DEFER, we mark the IP address unusable so as to skip it
5711 for any other delivery attempts using the same address. (It is copied into
5712 the unusable tree at the outer level, so even if different address blocks
5713 contain the same address, it still won't get tried again.) */
5715 if (rc == DEFER || retry_host_key)
5717 int delete_flag = rc != DEFER ? rf_delete : 0;
5718 if (!retry_host_key)
5721 if (exp_bool(addrlist, US"transport", tblock->name, D_transport,
5722 US"retry_include_ip_address", ob->retry_include_ip_address,
5723 ob->expand_retry_include_ip_address, &incl_ip) != OK)
5724 incl_ip = TRUE; /* error; use most-specific retry record */
5726 retry_host_key = incl_ip
5727 ? string_sprintf("T:%S:%s%s", host->name, host->address, pistring)
5728 : string_sprintf("T:%S%s", host->name, pistring);
5731 /* If a delivery of another message over an existing SMTP connection
5732 yields DEFER, we do NOT set up retry data for the host. This covers the
5733 case when there are delays in routing the addresses in the second message
5734 that are so long that the server times out. This is alleviated by not
5735 routing addresses that previously had routing defers when handling an
5736 existing connection, but even so, this case may occur (e.g. if a
5737 previously happily routed address starts giving routing defers). If the
5738 host is genuinely down, another non-continued message delivery will
5739 notice it soon enough. */
5741 if (delete_flag != 0 || !continue_hostname)
5742 retry_add_item(first_addr, retry_host_key, rf_host | delete_flag);
5744 /* We may have tried an expired host, if its retry time has come; ensure
5745 the status reflects the expiry for the benefit of any other addresses. */
5749 host->status = host_is_expired
5750 ? hstatus_unusable_expired : hstatus_unusable;
5751 host->why = hwhy_deferred;
5755 /* If message_defer is set (host was OK, but every recipient got deferred
5756 because of some message-specific problem), or if that had happened
5757 previously so that a message retry key exists, add an appropriate item
5758 to the retry chain. Note that if there was a message defer but now there is
5759 a host defer, the message defer record gets deleted. That seems perfectly
5760 reasonable. Also, stop the message from being remembered as waiting
5761 for specific hosts. */
5763 if (message_defer || retry_message_key)
5765 int delete_flag = message_defer ? 0 : rf_delete;
5766 if (!retry_message_key)
5769 if (exp_bool(addrlist, US"transport", tblock->name, D_transport,
5770 US"retry_include_ip_address", ob->retry_include_ip_address,
5771 ob->expand_retry_include_ip_address, &incl_ip) != OK)
5772 incl_ip = TRUE; /* error; use most-specific retry record */
5774 retry_message_key = incl_ip
5775 ? string_sprintf("T:%S:%s%s:%s", host->name, host->address, pistring,
5777 : string_sprintf("T:%S%s:%s", host->name, pistring, message_id);
5779 retry_add_item(addrlist, retry_message_key,
5780 rf_message | rf_host | delete_flag);
5781 update_waiting = FALSE;
5784 /* Any return other than DEFER (that is, OK or ERROR) means that the
5785 addresses have got their final statuses filled in for this host. In the OK
5786 case, see if any of them are deferred. */
5789 for (address_item * addr = addrlist; addr; addr = addr->next)
5790 if (addr->transport_return == DEFER)
5792 some_deferred = TRUE;
5796 /* If no addresses deferred or the result was ERROR, return. We do this for
5797 ERROR because a failing filter set-up or add_headers expansion is likely to
5798 fail for any host we try. */
5800 if (rc == ERROR || (rc == OK && !some_deferred))
5802 DEBUG(D_transport) debug_printf("Leaving %s transport\n", tblock->name);
5803 return TRUE; /* Each address has its status */
5806 /* If the result was DEFER or some individual addresses deferred, let
5807 the loop run to try other hosts with the deferred addresses, except for the
5808 case when we were trying to deliver down an existing channel and failed.
5809 Don't try any other hosts in this case. */
5811 if (continue_hostname) break;
5813 /* If the whole delivery, or some individual addresses, were deferred and
5814 there are more hosts that could be tried, do not count this host towards
5815 the hosts_max_try limit if the age of the message is greater than the
5816 maximum retry time for this host. This means we may try try all hosts,
5817 ignoring the limit, when messages have been around for some time. This is
5818 important because if we don't try all hosts, the address will never time
5819 out. NOTE: this does not apply to hosts_max_try_hardlimit. */
5821 if ((rc == DEFER || some_deferred) && nexthost)
5824 retry_config *retry = retry_find_config(host->name, NULL, 0, 0);
5826 if (retry && retry->rules)
5828 retry_rule *last_rule;
5829 for (last_rule = retry->rules;
5831 last_rule = last_rule->next);
5832 timedout = time(NULL) - received_time.tv_sec > last_rule->timeout;
5834 else timedout = TRUE; /* No rule => timed out */
5838 unexpired_hosts_tried--;
5839 DEBUG(D_transport) debug_printf("temporary delivery error(s) override "
5840 "hosts_max_try (message older than host's retry time)\n");
5846 if (unexpired_hosts_tried >= ob->hosts_max_try)
5847 debug_printf("reached transport hosts_max_try limit %d\n",
5849 if (total_hosts_tried >= ob->hosts_max_try_hardlimit)
5850 debug_printf("reached transport hosts_max_try_hardlimit limit %d\n",
5851 ob->hosts_max_try_hardlimit);
5854 testharness_pause_ms(500); /* let server debug out */
5855 } /* End of loop for trying multiple hosts. */
5857 /* If we failed to find a matching host in the list, for an already-open
5858 connection, just close it and start over with the list. This can happen
5859 for routing that changes from run to run, or big multi-IP sites with
5862 if (continue_hostname && !continue_host_tried)
5864 int fd = cutthrough.cctx.sock >= 0 ? cutthrough.cctx.sock : 0;
5866 DEBUG(D_transport) debug_printf("no hosts match already-open connection\n");
5868 /* A TLS conn could be open for a cutthrough, but not for a plain continued-
5870 /*XXX doublecheck that! */
5872 if (cutthrough.cctx.sock >= 0 && cutthrough.is_tls)
5874 (void) tls_write(cutthrough.cctx.tls_ctx, US"QUIT\r\n", 6, FALSE);
5875 tls_close(cutthrough.cctx.tls_ctx, TLS_SHUTDOWN_NOWAIT);
5876 cutthrough.cctx.tls_ctx = NULL;
5877 cutthrough.is_tls = FALSE;
5881 (void) write(fd, US"QUIT\r\n", 6);
5884 cutthrough.cctx.sock = -1;
5885 continue_hostname = NULL;
5886 goto retry_non_continued;
5889 /* This is the end of the loop that repeats iff expired is TRUE and
5890 ob->delay_after_cutoff is FALSE. The second time round we will
5891 try those hosts that haven't been tried since the message arrived. */
5895 debug_printf("all IP addresses skipped or deferred at least one address\n");
5896 if (expired && !ob->delay_after_cutoff && cutoff_retry == 0)
5897 debug_printf("retrying IP addresses not tried since message arrived\n");
5902 /* Get here if all IP addresses are skipped or defer at least one address. In
5903 MUA wrapper mode, this will happen only for connection or other non-message-
5904 specific failures. Force the delivery status for all addresses to FAIL. */
5908 for (address_item * addr = addrlist; addr; addr = addr->next)
5909 addr->transport_return = FAIL;
5913 /* In the normal, non-wrapper case, add a standard message to each deferred
5914 address if there hasn't been an error, that is, if it hasn't actually been
5915 tried this time. The variable "expired" will be FALSE if any deliveries were
5916 actually tried, or if there was at least one host that was not expired. That
5917 is, it is TRUE only if no deliveries were tried and all hosts were expired. If
5918 a delivery has been tried, an error code will be set, and the failing of the
5919 message is handled by the retry code later.
5921 If queue_smtp is set, or this transport was called to send a subsequent message
5922 down an existing TCP/IP connection, and something caused the host not to be
5923 found, we end up here, but can detect these cases and handle them specially. */
5925 for (address_item * addr = addrlist; addr; addr = addr->next)
5927 /* If host is not NULL, it means that we stopped processing the host list
5928 because of hosts_max_try or hosts_max_try_hardlimit. In the former case, this
5929 means we need to behave as if some hosts were skipped because their retry
5930 time had not come. Specifically, this prevents the address from timing out.
5931 However, if we have hit hosts_max_try_hardlimit, we want to behave as if all
5932 hosts were tried. */
5935 if (total_hosts_tried >= ob->hosts_max_try_hardlimit)
5938 debug_printf("hosts_max_try_hardlimit reached: behave as if all "
5939 "hosts were tried\n");
5944 debug_printf("hosts_max_try limit caused some hosts to be skipped\n");
5945 setflag(addr, af_retry_skipped);
5948 if (f.queue_smtp) /* no deliveries attempted */
5950 addr->transport_return = DEFER;
5951 addr->basic_errno = 0;
5952 addr->message = US"SMTP delivery explicitly queued";
5955 else if ( addr->transport_return == DEFER
5956 && (addr->basic_errno == ERRNO_UNKNOWNERROR || addr->basic_errno == 0)
5960 addr->basic_errno = ERRNO_HRETRY;
5961 if (continue_hostname)
5962 addr->message = US"no host found for existing SMTP connection";
5965 setflag(addr, af_pass_message); /* This is not a security risk */
5966 addr->message = string_sprintf(
5967 "all hosts%s have been failing for a long time %s",
5968 addr->domain ? string_sprintf(" for '%s'", addr->domain) : US"",
5969 ob->delay_after_cutoff
5970 ? US"(and retry time not reached)"
5971 : US"and were last tried after this message arrived");
5973 /* If we are already using fallback hosts, or there are no fallback hosts
5974 defined, convert the result to FAIL to cause a bounce. */
5976 if (addr->host_list == addr->fallback_hosts || !addr->fallback_hosts)
5977 addr->transport_return = FAIL;
5982 if (hosts_retry == hosts_total)
5983 s = "retry time not reached for any host%s";
5984 else if (hosts_fail == hosts_total)
5985 s = "all host address lookups%s failed permanently";
5986 else if (hosts_defer == hosts_total)
5987 s = "all host address lookups%s failed temporarily";
5988 else if (hosts_serial == hosts_total)
5989 s = "connection limit reached for all hosts%s";
5990 else if (hosts_fail+hosts_defer == hosts_total)
5991 s = "all host address lookups%s failed";
5993 s = "some host address lookups failed and retry time "
5994 "not reached for other hosts or connection limit reached%s";
5996 addr->message = string_sprintf(s,
5997 addr->domain ? string_sprintf(" for '%s'", addr->domain) : US"");
6002 /* Update the database which keeps information about which messages are waiting
6003 for which hosts to become available. For some message-specific errors, the
6004 update_waiting flag is turned off because we don't want follow-on deliveries in
6005 those cases. If this transport instance is explicitly limited to one message
6006 per connection then follow-on deliveries are not possible and there's no need
6007 to create/update the per-transport wait-<transport_name> database. */
6009 if (update_waiting && tblock->connection_max_messages != 1)
6010 transport_update_waiting(hostlist, tblock->name);
6014 DEBUG(D_transport) debug_printf("Leaving %s transport\n", tblock->name);
6016 return TRUE; /* Each address has its status */
6019 #endif /*!MACRO_PREDEF*/
6022 /* End of transport/smtp.c */