1 /*************************************************
2 * Exim - an Internet mail transport agent *
3 *************************************************/
5 /* Copyright (c) University of Cambridge 1995 - 2018 */
6 /* Copyright (c) The Exim Maintainers 2020 - 2021 */
7 /* See the file NOTICE for conditions of use and distribution. */
12 #if defined(SUPPORT_DANE) && defined(DISABLE_TLS)
13 # error TLS is required for DANE
17 /* Options specific to the smtp transport. This transport also supports LMTP
18 over TCP/IP. The options must be in alphabetic order (note that "_" comes
19 before the lower case letters). Some live in the transport_instance block so as
20 to be publicly visible; these are flagged with opt_public. */
22 #define LOFF(field) OPT_OFF(smtp_transport_options_block, field)
24 optionlist smtp_transport_options[] = {
25 { "*expand_multi_domain", opt_stringptr | opt_hidden | opt_public,
26 OPT_OFF(transport_instance, expand_multi_domain) },
27 { "*expand_retry_include_ip_address", opt_stringptr | opt_hidden,
28 LOFF(expand_retry_include_ip_address) },
30 { "address_retry_include_sender", opt_bool,
31 LOFF(address_retry_include_sender) },
32 { "allow_localhost", opt_bool, LOFF(allow_localhost) },
33 #ifdef EXPERIMENTAL_ARC
34 { "arc_sign", opt_stringptr, LOFF(arc_sign) },
36 { "authenticated_sender", opt_stringptr, LOFF(authenticated_sender) },
37 { "authenticated_sender_force", opt_bool, LOFF(authenticated_sender_force) },
38 { "command_timeout", opt_time, LOFF(command_timeout) },
39 { "connect_timeout", opt_time, LOFF(connect_timeout) },
40 { "connection_max_messages", opt_int | opt_public,
41 OPT_OFF(transport_instance, connection_max_messages) },
43 { "dane_require_tls_ciphers", opt_stringptr, LOFF(dane_require_tls_ciphers) },
45 { "data_timeout", opt_time, LOFF(data_timeout) },
46 { "delay_after_cutoff", opt_bool, LOFF(delay_after_cutoff) },
48 { "dkim_canon", opt_stringptr, LOFF(dkim.dkim_canon) },
49 { "dkim_domain", opt_stringptr, LOFF(dkim.dkim_domain) },
50 { "dkim_hash", opt_stringptr, LOFF(dkim.dkim_hash) },
51 { "dkim_identity", opt_stringptr, LOFF(dkim.dkim_identity) },
52 { "dkim_private_key", opt_stringptr, LOFF(dkim.dkim_private_key) },
53 { "dkim_selector", opt_stringptr, LOFF(dkim.dkim_selector) },
54 { "dkim_sign_headers", opt_stringptr, LOFF(dkim.dkim_sign_headers) },
55 { "dkim_strict", opt_stringptr, LOFF(dkim.dkim_strict) },
56 { "dkim_timestamps", opt_stringptr, LOFF(dkim.dkim_timestamps) },
58 { "dns_qualify_single", opt_bool, LOFF(dns_qualify_single) },
59 { "dns_search_parents", opt_bool, LOFF(dns_search_parents) },
60 { "dnssec_request_domains", opt_stringptr, LOFF(dnssec.request) },
61 { "dnssec_require_domains", opt_stringptr, LOFF(dnssec.require) },
62 { "dscp", opt_stringptr, LOFF(dscp) },
63 { "fallback_hosts", opt_stringptr, LOFF(fallback_hosts) },
64 { "final_timeout", opt_time, LOFF(final_timeout) },
65 { "gethostbyname", opt_bool, LOFF(gethostbyname) },
66 { "helo_data", opt_stringptr, LOFF(helo_data) },
67 { "hosts", opt_stringptr, LOFF(hosts) },
68 { "hosts_avoid_esmtp", opt_stringptr, LOFF(hosts_avoid_esmtp) },
69 { "hosts_avoid_pipelining", opt_stringptr, LOFF(hosts_avoid_pipelining) },
71 { "hosts_avoid_tls", opt_stringptr, LOFF(hosts_avoid_tls) },
73 { "hosts_max_try", opt_int, LOFF(hosts_max_try) },
74 { "hosts_max_try_hardlimit", opt_int, LOFF(hosts_max_try_hardlimit) },
76 { "hosts_nopass_tls", opt_stringptr, LOFF(hosts_nopass_tls) },
77 { "hosts_noproxy_tls", opt_stringptr, LOFF(hosts_noproxy_tls) },
79 { "hosts_override", opt_bool, LOFF(hosts_override) },
80 #ifndef DISABLE_PIPE_CONNECT
81 { "hosts_pipe_connect", opt_stringptr, LOFF(hosts_pipe_connect) },
83 { "hosts_randomize", opt_bool, LOFF(hosts_randomize) },
84 #if !defined(DISABLE_TLS) && !defined(DISABLE_OCSP)
85 { "hosts_request_ocsp", opt_stringptr, LOFF(hosts_request_ocsp) },
87 { "hosts_require_alpn", opt_stringptr, LOFF(hosts_require_alpn) },
88 { "hosts_require_auth", opt_stringptr, LOFF(hosts_require_auth) },
91 { "hosts_require_dane", opt_stringptr, LOFF(hosts_require_dane) },
94 { "hosts_require_ocsp", opt_stringptr, LOFF(hosts_require_ocsp) },
96 { "hosts_require_tls", opt_stringptr, LOFF(hosts_require_tls) },
98 { "hosts_try_auth", opt_stringptr, LOFF(hosts_try_auth) },
99 { "hosts_try_chunking", opt_stringptr, LOFF(hosts_try_chunking) },
101 { "hosts_try_dane", opt_stringptr, LOFF(hosts_try_dane) },
103 { "hosts_try_fastopen", opt_stringptr, LOFF(hosts_try_fastopen) },
105 { "hosts_try_prdr", opt_stringptr, LOFF(hosts_try_prdr) },
108 { "hosts_verify_avoid_tls", opt_stringptr, LOFF(hosts_verify_avoid_tls) },
110 { "interface", opt_stringptr, LOFF(interface) },
111 { "keepalive", opt_bool, LOFF(keepalive) },
112 { "lmtp_ignore_quota", opt_bool, LOFF(lmtp_ignore_quota) },
113 { "max_rcpt", opt_int | opt_public,
114 OPT_OFF(transport_instance, max_addresses) },
115 { "message_linelength_limit", opt_int, LOFF(message_linelength_limit) },
116 { "multi_domain", opt_expand_bool | opt_public,
117 OPT_OFF(transport_instance, multi_domain) },
118 { "port", opt_stringptr, LOFF(port) },
119 { "protocol", opt_stringptr, LOFF(protocol) },
120 { "retry_include_ip_address", opt_expand_bool, LOFF(retry_include_ip_address) },
121 { "serialize_hosts", opt_stringptr, LOFF(serialize_hosts) },
122 { "size_addition", opt_int, LOFF(size_addition) },
124 { "socks_proxy", opt_stringptr, LOFF(socks_proxy) },
127 { "tls_alpn", opt_stringptr, LOFF(tls_alpn) },
128 { "tls_certificate", opt_stringptr, LOFF(tls_certificate) },
129 { "tls_crl", opt_stringptr, LOFF(tls_crl) },
130 { "tls_dh_min_bits", opt_int, LOFF(tls_dh_min_bits) },
131 { "tls_privatekey", opt_stringptr, LOFF(tls_privatekey) },
132 { "tls_require_ciphers", opt_stringptr, LOFF(tls_require_ciphers) },
133 # ifndef DISABLE_TLS_RESUME
134 { "tls_resumption_hosts", opt_stringptr, LOFF(tls_resumption_hosts) },
136 { "tls_sni", opt_stringptr, LOFF(tls_sni) },
137 { "tls_tempfail_tryclear", opt_bool, LOFF(tls_tempfail_tryclear) },
138 { "tls_try_verify_hosts", opt_stringptr, LOFF(tls_try_verify_hosts) },
139 { "tls_verify_cert_hostnames", opt_stringptr, LOFF(tls_verify_cert_hostnames)},
140 { "tls_verify_certificates", opt_stringptr, LOFF(tls_verify_certificates) },
141 { "tls_verify_hosts", opt_stringptr, LOFF(tls_verify_hosts) },
144 { "utf8_downconvert", opt_stringptr, LOFF(utf8_downconvert) },
148 /* Size of the options list. An extern variable has to be used so that its
149 address can appear in the tables drtables.c. */
151 int smtp_transport_options_count = nelem(smtp_transport_options);
157 smtp_transport_options_block smtp_transport_option_defaults = {0};
158 void smtp_transport_init(transport_instance *tblock) {}
159 BOOL smtp_transport_entry(transport_instance *tblock, address_item *addr) {return FALSE;}
160 void smtp_transport_closedown(transport_instance *tblock) {}
162 #else /*!MACRO_PREDEF*/
165 /* Default private options block for the smtp transport. */
167 smtp_transport_options_block smtp_transport_option_defaults = {
168 /* All non-mentioned elements 0/NULL/FALSE */
169 .helo_data = US"$primary_hostname",
170 .protocol = US"smtp",
171 .hosts_try_chunking = US"*",
173 .hosts_try_dane = US"*",
175 .hosts_try_fastopen = US"*",
177 .hosts_try_prdr = US"*",
180 .hosts_request_ocsp = US"*", /* hosts_request_ocsp (except under DANE; tls_client_start()) */
182 .command_timeout = 5*60,
183 .connect_timeout = 5*60,
184 .data_timeout = 5*60,
185 .final_timeout = 10*60,
186 .size_addition = 1024,
188 .hosts_max_try_hardlimit = 50,
189 .message_linelength_limit = 998,
190 .address_retry_include_sender = TRUE,
191 .dns_qualify_single = TRUE,
192 .dnssec = { .request= US"*", .require=NULL },
193 .delay_after_cutoff = TRUE,
195 .retry_include_ip_address = TRUE,
197 .tls_verify_certificates = US"system",
198 .tls_dh_min_bits = EXIM_CLIENT_DH_DEFAULT_MIN_BITS,
199 .tls_tempfail_tryclear = TRUE,
200 .tls_try_verify_hosts = US"*",
201 .tls_verify_cert_hostnames = US"*",
204 .utf8_downconvert = US"-1",
208 { .dkim_hash = US"sha256", },
212 /* some DSN flags for use later */
214 static int rf_list[] = {rf_notify_never, rf_notify_success,
215 rf_notify_failure, rf_notify_delay };
217 static uschar *rf_names[] = { US"NEVER", US"SUCCESS", US"FAILURE", US"DELAY" };
223 static uschar *smtp_command; /* Points to last cmd for error messages */
224 static uschar *mail_command; /* Points to MAIL cmd for error messages */
225 static uschar *data_command = US""; /* Points to DATA cmd for error messages */
226 static BOOL update_waiting; /* TRUE to update the "wait" database */
228 /*XXX move to smtp_context */
229 static BOOL pipelining_active; /* current transaction is in pipe mode */
232 static unsigned ehlo_response(uschar * buf, unsigned checks);
235 /******************************************************************************/
238 smtp_deliver_init(void)
242 const pcre2_code ** re;
243 const uschar * string;
246 { ®ex_AUTH, AUTHS_REGEX },
247 { ®ex_CHUNKING, US"\\n250[\\s\\-]CHUNKING(\\s|\\n|$)" },
248 { ®ex_DSN, US"\\n250[\\s\\-]DSN(\\s|\\n|$)" },
249 { ®ex_IGNOREQUOTA, US"\\n250[\\s\\-]IGNOREQUOTA(\\s|\\n|$)" },
250 { ®ex_PIPELINING, US"\\n250[\\s\\-]PIPELINING(\\s|\\n|$)" },
251 { ®ex_SIZE, US"\\n250[\\s\\-]SIZE(\\s|\\n|$)" },
254 { ®ex_STARTTLS, US"\\n250[\\s\\-]STARTTLS(\\s|\\n|$)" },
257 { ®ex_PRDR, US"\\n250[\\s\\-]PRDR(\\s|\\n|$)" },
260 { ®ex_UTF8, US"\\n250[\\s\\-]SMTPUTF8(\\s|\\n|$)" },
262 #ifndef DISABLE_PIPE_CONNECT
263 { ®ex_EARLY_PIPE, US"\\n250[\\s\\-]" EARLY_PIPE_FEATURE_NAME "(\\s|\\n|$)" },
265 #ifdef EXPERIMENTAL_ESMTP_LIMITS
266 { ®ex_LIMITS, US"\\n250[\\s\\-]LIMITS\\s" },
270 for (struct list * l = list; l < list + nelem(list); l++)
272 *l->re = regex_must_compile(l->string, FALSE, TRUE);
276 /*************************************************
277 * Setup entry point *
278 *************************************************/
280 /* This function is called when the transport is about to be used,
281 but before running it in a sub-process. It is used for two things:
283 (1) To set the fallback host list in addresses, when delivering.
284 (2) To pass back the interface, port, protocol, and other options, for use
285 during callout verification.
288 tblock pointer to the transport instance block
289 addrlist list of addresses about to be transported
290 tf if not NULL, pointer to block in which to return options
291 uid the uid that will be set (not used)
292 gid the gid that will be set (not used)
293 errmsg place for error message (not used)
295 Returns: OK always (FAIL, DEFER not used)
299 smtp_transport_setup(transport_instance *tblock, address_item *addrlist,
300 transport_feedback *tf, uid_t uid, gid_t gid, uschar **errmsg)
302 smtp_transport_options_block *ob = SOB tblock->options_block;
304 /* Pass back options if required. This interface is getting very messy. */
308 tf->interface = ob->interface;
310 tf->protocol = ob->protocol;
311 tf->hosts = ob->hosts;
312 tf->hosts_override = ob->hosts_override;
313 tf->hosts_randomize = ob->hosts_randomize;
314 tf->gethostbyname = ob->gethostbyname;
315 tf->qualify_single = ob->dns_qualify_single;
316 tf->search_parents = ob->dns_search_parents;
317 tf->helo_data = ob->helo_data;
320 /* Set the fallback host list for all the addresses that don't have fallback
321 host lists, provided that the local host wasn't present in the original host
324 if (!testflag(addrlist, af_local_host_removed))
325 for (; addrlist; addrlist = addrlist->next)
326 if (!addrlist->fallback_hosts) addrlist->fallback_hosts = ob->fallback_hostlist;
333 /*************************************************
334 * Initialization entry point *
335 *************************************************/
337 /* Called for each instance, after its options have been read, to
338 enable consistency checks to be done, or anything else that needs
341 Argument: pointer to the transport instance block
346 smtp_transport_init(transport_instance *tblock)
348 smtp_transport_options_block *ob = SOB tblock->options_block;
349 int old_pool = store_pool;
351 /* Retry_use_local_part defaults FALSE if unset */
353 if (tblock->retry_use_local_part == TRUE_UNSET)
354 tblock->retry_use_local_part = FALSE;
356 /* Set the default port according to the protocol */
359 ob->port = strcmpic(ob->protocol, US"lmtp") == 0
361 : strcmpic(ob->protocol, US"smtps") == 0
362 ? US"smtps" : US"smtp";
364 /* Set up the setup entry point, to be called before subprocesses for this
367 tblock->setup = smtp_transport_setup;
369 /* Complain if any of the timeouts are zero. */
371 if (ob->command_timeout <= 0 || ob->data_timeout <= 0 ||
372 ob->final_timeout <= 0)
373 log_write(0, LOG_PANIC_DIE|LOG_CONFIG,
374 "command, data, or final timeout value is zero for %s transport",
377 /* If hosts_override is set and there are local hosts, set the global
378 flag that stops verify from showing router hosts. */
380 if (ob->hosts_override && ob->hosts) tblock->overrides_hosts = TRUE;
382 /* If there are any fallback hosts listed, build a chain of host items
383 for them, but do not do any lookups at this time. */
385 store_pool = POOL_PERM;
386 host_build_hostlist(&ob->fallback_hostlist, ob->fallback_hosts, FALSE);
387 store_pool = old_pool;
394 /*************************************************
395 * Set delivery info into all active addresses *
396 *************************************************/
398 /* Only addresses whose status is >= PENDING are relevant. A lesser
399 status means that an address is not currently being processed.
402 addrlist points to a chain of addresses
403 errno_value to put in each address's errno field
404 msg to put in each address's message field
405 rc to put in each address's transport_return field
406 pass_message if TRUE, set the "pass message" flag in the address
407 host if set, mark addrs as having used this host
408 smtp_greeting from peer
409 helo_response from peer
410 start points to timestamp of delivery start
412 If errno_value has the special value ERRNO_CONNECTTIMEOUT, ETIMEDOUT is put in
413 the errno field, and RTEF_CTOUT is ORed into the more_errno field, to indicate
414 this particular type of timeout.
420 set_errno(address_item *addrlist, int errno_value, uschar *msg, int rc,
421 BOOL pass_message, host_item * host,
422 #ifdef EXPERIMENTAL_DSN_INFO
423 const uschar * smtp_greeting, const uschar * helo_response,
425 struct timeval * start
429 struct timeval deliver_time;
431 if (errno_value == ERRNO_CONNECTTIMEOUT)
433 errno_value = ETIMEDOUT;
434 orvalue = RTEF_CTOUT;
436 timesince(&deliver_time, start);
438 for (address_item * addr = addrlist; addr; addr = addr->next)
439 if (addr->transport_return >= PENDING)
441 addr->basic_errno = errno_value;
442 addr->more_errno |= orvalue;
443 addr->delivery_time = deliver_time;
447 if (pass_message) setflag(addr, af_pass_message);
449 addr->transport_return = rc;
452 addr->host_used = host;
453 #ifdef EXPERIMENTAL_DSN_INFO
455 {uschar * s = Ustrchr(smtp_greeting, '\n'); if (s) *s = '\0';}
456 addr->smtp_greeting = smtp_greeting;
459 {uschar * s = Ustrchr(helo_response, '\n'); if (s) *s = '\0';}
460 addr->helo_response = helo_response;
467 set_errno_nohost(address_item * addrlist, int errno_value, uschar * msg, int rc,
468 BOOL pass_message, struct timeval * start)
470 set_errno(addrlist, errno_value, msg, rc, pass_message, NULL,
471 #ifdef EXPERIMENTAL_DSN_INFO
478 /*************************************************
479 * Check an SMTP response *
480 *************************************************/
482 /* This function is given an errno code and the SMTP response buffer
483 to analyse, together with the host identification for generating messages. It
484 sets an appropriate message and puts the first digit of the response code into
485 the yield variable. If no response was actually read, a suitable digit is
489 host the current host, to get its name for messages
490 errno_value pointer to the errno value
491 more_errno from the top address for use with ERRNO_FILTER_FAIL
492 buffer the SMTP response buffer
493 yield where to put a one-digit SMTP response code
494 message where to put an error message
495 pass_message set TRUE if message is an SMTP response
497 Returns: TRUE if an SMTP "QUIT" command should be sent, else FALSE
501 check_response(host_item *host, int *errno_value, int more_errno,
502 uschar *buffer, int *yield, uschar **message, BOOL *pass_message)
504 uschar * pl = pipelining_active ? US"pipelined " : US"";
507 *yield = '4'; /* Default setting is to give a temporary error */
511 case ETIMEDOUT: /* Handle response timeout */
512 *message = US string_sprintf("SMTP timeout after %s%s",
514 if (transport_count > 0)
515 *message = US string_sprintf("%s (%d bytes written)", *message,
519 case ERRNO_SMTPFORMAT: /* Handle malformed SMTP response */
520 s = string_printing(buffer);
521 while (isspace(*s)) s++;
523 ? string_sprintf("Malformed SMTP reply (an empty line) "
524 "in response to %s%s", pl, smtp_command)
525 : string_sprintf("Malformed SMTP reply in response to %s%s: %s",
526 pl, smtp_command, s);
529 case ERRNO_TLSFAILURE: /* Handle bad first read; can happen with
531 *message = US"bad first read from TLS conn";
534 case ERRNO_FILTER_FAIL: /* Handle a failed filter process error;
535 can't send QUIT as we mustn't end the DATA. */
536 *message = string_sprintf("transport filter process failed (%d)%s",
538 more_errno == EX_EXECFAILED ? ": unable to execute command" : "");
541 case ERRNO_CHHEADER_FAIL: /* Handle a failed add_headers expansion;
542 can't send QUIT as we mustn't end the DATA. */
544 string_sprintf("failed to expand headers_add or headers_remove: %s",
545 expand_string_message);
548 case ERRNO_WRITEINCOMPLETE: /* failure to write a complete data block */
549 *message = US"failed to write a data block";
553 case ERRNO_UTF8_FWD: /* no advertised SMTPUTF8, for international message */
554 *message = US"utf8 support required but not offered for forwarding";
555 DEBUG(D_deliver|D_transport) debug_printf("%s\n", *message);
560 /* Handle error responses from the remote mailer. */
564 *message = string_sprintf("SMTP error from remote mail server after %s%s: "
565 "%s", pl, smtp_command, s = string_printing(buffer));
566 *pass_message = TRUE;
571 /* No data was read. If there is no errno, this must be the EOF (i.e.
572 connection closed) case, which causes deferral. An explicit connection reset
573 error has the same effect. Otherwise, put the host's identity in the message,
574 leaving the errno value to be interpreted as well. In all cases, we have to
575 assume the connection is now dead. */
577 if (*errno_value == 0 || *errno_value == ECONNRESET)
579 *errno_value = ERRNO_SMTPCLOSED;
580 *message = US string_sprintf("Remote host closed connection "
581 "in response to %s%s", pl, smtp_command);
584 *message = US string_sprintf("%s [%s]", host->name, host->address);
591 /*************************************************
592 * Write error message to logs *
593 *************************************************/
595 /* This writes to the main log and to the message log.
598 host the current host
599 detail the current message (addr_item->message)
600 basic_errno the errno (addr_item->basic_errno)
606 write_logs(const host_item *host, const uschar *suffix, int basic_errno)
608 gstring * message = LOGGING(outgoing_port)
609 ? string_fmt_append(NULL, "H=%s [%s]:%d", host->name, host->address,
610 host->port == PORT_NONE ? 25 : host->port)
611 : string_fmt_append(NULL, "H=%s [%s]", host->name, host->address);
615 message = string_fmt_append(message, ": %s", suffix);
617 message = string_fmt_append(message, ": %s", strerror(basic_errno));
620 message = string_fmt_append(message, " %s", exim_errstr(basic_errno));
622 log_write(0, LOG_MAIN, "%s", string_from_gstring(message));
623 deliver_msglog("%s %s\n", tod_stamp(tod_log), message->s);
627 msglog_line(host_item * host, uschar * message)
629 deliver_msglog("%s H=%s [%s] %s\n", tod_stamp(tod_log),
630 host->name, host->address, message);
635 #ifndef DISABLE_EVENT
636 /*************************************************
637 * Post-defer action *
638 *************************************************/
640 /* This expands an arbitrary per-transport string.
641 It might, for example, be used to write to the database log.
644 addr the address item containing error information
645 host the current host
652 deferred_event_raise(address_item * addr, host_item * host, uschar * evstr)
654 uschar * action = addr->transport->event_action;
655 const uschar * save_domain;
661 save_domain = deliver_domain;
662 save_local = deliver_localpart;
664 /*XXX would ip & port already be set up? */
665 deliver_host_address = string_copy(host->address);
666 deliver_host_port = host->port == PORT_NONE ? 25 : host->port;
667 event_defer_errno = addr->basic_errno;
669 router_name = addr->router->name;
670 transport_name = addr->transport->name;
671 deliver_domain = addr->domain;
672 deliver_localpart = addr->local_part;
674 (void) event_raise(action, evstr,
676 ? addr->basic_errno > 0
677 ? string_sprintf("%s: %s", addr->message, strerror(addr->basic_errno))
678 : string_copy(addr->message)
679 : addr->basic_errno > 0
680 ? string_copy(US strerror(addr->basic_errno))
684 deliver_localpart = save_local;
685 deliver_domain = save_domain;
686 router_name = transport_name = NULL;
690 /*************************************************
691 * Reap SMTP specific responses *
692 *************************************************/
694 smtp_discard_responses(smtp_context * sx, smtp_transport_options_block * ob,
697 uschar flushbuffer[4096];
701 if (!smtp_read_response(sx, flushbuffer, sizeof(flushbuffer),
702 '2', ob->command_timeout)
703 && (errno != 0 || flushbuffer[0] == 0))
710 /* Return boolean success */
713 smtp_reap_banner(smtp_context * sx)
716 #if defined(__linux__) && defined(TCP_QUICKACK)
717 { /* Hack to get QUICKACK disabled; has to be right after 3whs, and has to on->off */
718 int sock = sx->cctx.sock;
719 struct pollfd p = {.fd = sock, .events = POLLOUT};
720 if (poll(&p, 1, 1000) >= 0) /* retval test solely for compiler quitening */
722 (void) setsockopt(sock, IPPROTO_TCP, TCP_QUICKACK, US &on, sizeof(on));
723 (void) setsockopt(sock, IPPROTO_TCP, TCP_QUICKACK, US &off, sizeof(off));
727 good_response = smtp_read_response(sx, sx->buffer, sizeof(sx->buffer),
728 '2', (SOB sx->conn_args.ob)->command_timeout);
729 #ifdef EXPERIMENTAL_DSN_INFO
730 sx->smtp_greeting = string_copy(sx->buffer);
732 return good_response;
736 smtp_reap_ehlo(smtp_context * sx)
738 if (!smtp_read_response(sx, sx->buffer, sizeof(sx->buffer), '2',
739 (SOB sx->conn_args.ob)->command_timeout))
741 if (errno != 0 || sx->buffer[0] == 0 || sx->lmtp)
743 #ifdef EXPERIMENTAL_DSN_INFO
744 sx->helo_response = string_copy(sx->buffer);
750 #ifdef EXPERIMENTAL_DSN_INFO
751 sx->helo_response = string_copy(sx->buffer);
753 #ifndef DISABLE_EVENT
754 (void) event_raise(sx->conn_args.tblock->event_action,
755 US"smtp:ehlo", sx->buffer, NULL);
761 /******************************************************************************/
763 #ifdef EXPERIMENTAL_ESMTP_LIMITS
764 /* If TLS, or TLS not offered, called with the EHLO response in the buffer.
765 Check it for a LIMITS keyword and parse values into the smtp context structure.
767 We don't bother with peers that we won't talk TLS to, even though they can,
768 just ignore their LIMITS advice (if any) and treat them as if they do not.
769 This saves us dealing with a duplicate set of values. */
772 ehlo_response_limits_read(smtp_context * sx)
776 /* matches up to just after the first space after the keyword */
778 if (regex_match(regex_LIMITS, sx->buffer, -1, &match))
779 for (const uschar * s = sx->buffer + Ustrlen(match); *s; )
781 while (isspace(*s)) s++;
782 if (*s == '\n') break;
784 if (strncmpic(s, US"MAILMAX=", 8) == 0)
786 sx->peer_limit_mail = atoi(CS (s += 8));
787 while (isdigit(*s)) s++;
789 else if (strncmpic(s, US"RCPTMAX=", 8) == 0)
791 sx->peer_limit_rcpt = atoi(CS (s += 8));
792 while (isdigit(*s)) s++;
794 else if (strncmpic(s, US"RCPTDOMAINMAX=", 14) == 0)
796 sx->peer_limit_rcptdom = atoi(CS (s += 14));
797 while (isdigit(*s)) s++;
800 while (*s && !isspace(*s)) s++;
804 /* Apply given values to the current connection */
806 ehlo_limits_apply(smtp_context * sx,
807 unsigned limit_mail, unsigned limit_rcpt, unsigned limit_rcptdom)
809 if (limit_mail && limit_mail < sx->max_mail) sx->max_mail = limit_mail;
810 if (limit_rcpt && limit_rcpt < sx->max_rcpt) sx->max_rcpt = limit_rcpt;
813 DEBUG(D_transport) debug_printf("will treat as !multi_domain\n");
814 sx->single_rcpt_domain = TRUE;
818 /* Apply values from EHLO-resp to the current connection */
820 ehlo_response_limits_apply(smtp_context * sx)
822 ehlo_limits_apply(sx, sx->peer_limit_mail, sx->peer_limit_rcpt,
823 sx->peer_limit_rcptdom);
826 /* Apply values read from cache to the current connection */
828 ehlo_cache_limits_apply(smtp_context * sx)
830 ehlo_limits_apply(sx, sx->ehlo_resp.limit_mail, sx->ehlo_resp.limit_rcpt,
831 sx->ehlo_resp.limit_rcptdom);
835 /******************************************************************************/
837 #ifndef DISABLE_PIPE_CONNECT
839 ehlo_cache_key(const smtp_context * sx)
841 host_item * host = sx->conn_args.host;
842 return Ustrchr(host->address, ':')
843 ? string_sprintf("[%s]:%d.EHLO", host->address,
844 host->port == PORT_NONE ? sx->port : host->port)
845 : string_sprintf("%s:%d.EHLO", host->address,
846 host->port == PORT_NONE ? sx->port : host->port);
849 /* Cache EHLO-response info for use by early-pipe.
851 - During a normal flow on EHLO response (either cleartext or under TLS),
852 when we are willing to do PIPECONNECT and it is offered
853 - During an early-pipe flow on receiving the actual EHLO response and noting
854 disparity versus the cached info used, when PIPECONNECT is still being offered
856 We assume that suitable values have been set in the sx.ehlo_resp structure for
857 features and auths; we handle the copy of limits. */
860 write_ehlo_cache_entry(smtp_context * sx)
862 open_db dbblock, * dbm_file;
864 #ifdef EXPERIMENTAL_ESMTP_LIMITS
865 sx->ehlo_resp.limit_mail = sx->peer_limit_mail;
866 sx->ehlo_resp.limit_rcpt = sx->peer_limit_rcpt;
867 sx->ehlo_resp.limit_rcptdom = sx->peer_limit_rcptdom;
870 if ((dbm_file = dbfn_open(US"misc", O_RDWR, &dbblock, TRUE, TRUE)))
872 uschar * ehlo_resp_key = ehlo_cache_key(sx);
873 dbdata_ehlo_resp er = { .data = sx->ehlo_resp };
876 #ifdef EXPERIMENTAL_ESMTP_LIMITS
877 if (sx->ehlo_resp.limit_mail || sx->ehlo_resp.limit_rcpt || sx->ehlo_resp.limit_rcptdom)
878 debug_printf("writing clr %04x/%04x cry %04x/%04x lim %05d/%05d/%05d\n",
879 sx->ehlo_resp.cleartext_features, sx->ehlo_resp.cleartext_auths,
880 sx->ehlo_resp.crypted_features, sx->ehlo_resp.crypted_auths,
881 sx->ehlo_resp.limit_mail, sx->ehlo_resp.limit_rcpt,
882 sx->ehlo_resp.limit_rcptdom);
885 debug_printf("writing clr %04x/%04x cry %04x/%04x\n",
886 sx->ehlo_resp.cleartext_features, sx->ehlo_resp.cleartext_auths,
887 sx->ehlo_resp.crypted_features, sx->ehlo_resp.crypted_auths);
889 dbfn_write(dbm_file, ehlo_resp_key, &er, (int)sizeof(er));
890 dbfn_close(dbm_file);
895 invalidate_ehlo_cache_entry(smtp_context * sx)
897 open_db dbblock, * dbm_file;
899 if ( sx->early_pipe_active
900 && (dbm_file = dbfn_open(US"misc", O_RDWR, &dbblock, TRUE, TRUE)))
902 uschar * ehlo_resp_key = ehlo_cache_key(sx);
903 dbfn_delete(dbm_file, ehlo_resp_key);
904 dbfn_close(dbm_file);
909 read_ehlo_cache_entry(smtp_context * sx)
914 if (!(dbm_file = dbfn_open(US"misc", O_RDONLY, &dbblock, FALSE, TRUE)))
915 { DEBUG(D_transport) debug_printf("ehlo-cache: no misc DB\n"); }
918 uschar * ehlo_resp_key = ehlo_cache_key(sx);
919 dbdata_ehlo_resp * er;
921 if (!(er = dbfn_read_enforce_length(dbm_file, ehlo_resp_key, sizeof(dbdata_ehlo_resp))))
922 { DEBUG(D_transport) debug_printf("no ehlo-resp record\n"); }
923 else if (time(NULL) - er->time_stamp > retry_data_expire)
925 DEBUG(D_transport) debug_printf("ehlo-resp record too old\n");
926 dbfn_close(dbm_file);
927 if ((dbm_file = dbfn_open(US"misc", O_RDWR, &dbblock, TRUE, TRUE)))
928 dbfn_delete(dbm_file, ehlo_resp_key);
933 #ifdef EXPERIMENTAL_ESMTP_LIMITS
934 if (er->data.limit_mail || er->data.limit_rcpt || er->data.limit_rcptdom)
935 debug_printf("EHLO response bits from cache:"
936 " cleartext 0x%04x/0x%04x crypted 0x%04x/0x%04x lim %05d/%05d/%05d\n",
937 er->data.cleartext_features, er->data.cleartext_auths,
938 er->data.crypted_features, er->data.crypted_auths,
939 er->data.limit_mail, er->data.limit_rcpt, er->data.limit_rcptdom);
942 debug_printf("EHLO response bits from cache:"
943 " cleartext 0x%04x/0x%04x crypted 0x%04x/0x%04x\n",
944 er->data.cleartext_features, er->data.cleartext_auths,
945 er->data.crypted_features, er->data.crypted_auths);
947 sx->ehlo_resp = er->data;
948 #ifdef EXPERIMENTAL_ESMTP_LIMITS
949 ehlo_cache_limits_apply(sx);
951 dbfn_close(dbm_file);
954 dbfn_close(dbm_file);
961 /* Return an auths bitmap for the set of AUTH methods offered by the server
962 which match our authenticators. */
964 static unsigned short
965 study_ehlo_auths(smtp_context * sx)
970 unsigned short authbits = 0;
972 if (!sx->esmtp) return 0;
973 if (!regex_AUTH) regex_AUTH = regex_must_compile(AUTHS_REGEX, FALSE, TRUE);
974 if (!regex_match_and_setup(regex_AUTH, sx->buffer, 0, -1)) return 0;
975 expand_nmax = -1; /* reset */
976 names = string_copyn(expand_nstring[1], expand_nlength[1]);
978 for (au = auths, authnum = 0; au; au = au->next, authnum++) if (au->client)
980 const uschar * list = names;
982 for (int sep = ' '; s = string_nextinlist(&list, &sep, NULL, 0); )
983 if (strcmpic(au->public_name, s) == 0)
984 { authbits |= BIT(authnum); break; }
988 debug_printf("server offers %s AUTH, methods '%s', bitmap 0x%04x\n",
989 tls_out.active.sock >= 0 ? "crypted" : "plaintext", names, authbits);
991 if (tls_out.active.sock >= 0)
992 sx->ehlo_resp.crypted_auths = authbits;
994 sx->ehlo_resp.cleartext_auths = authbits;
1001 /* Wait for and check responses for early-pipelining.
1003 Called from the lower-level smtp_read_response() function
1004 used for general code that assume synchronisation, if context
1005 flags indicate outstanding early-pipelining commands. Also
1006 called fom sync_responses() which handles pipelined commands.
1009 sx smtp connection context
1010 countp number of outstanding responses, adjusted on return
1014 DEFER error on first read of TLS'd conn
1015 FAIL SMTP error in response
1018 smtp_reap_early_pipe(smtp_context * sx, int * countp)
1020 BOOL pending_BANNER = sx->pending_BANNER;
1021 BOOL pending_EHLO = sx->pending_EHLO;
1024 sx->pending_BANNER = FALSE; /* clear early to avoid recursion */
1025 sx->pending_EHLO = FALSE;
1029 DEBUG(D_transport) debug_printf("%s expect banner\n", __FUNCTION__);
1031 if (!smtp_reap_banner(sx))
1033 DEBUG(D_transport) debug_printf("bad banner\n");
1034 if (tls_out.active.sock >= 0) rc = DEFER;
1041 unsigned peer_offered;
1042 unsigned short authbits = 0, * ap;
1044 DEBUG(D_transport) debug_printf("%s expect ehlo\n", __FUNCTION__);
1046 if (!smtp_reap_ehlo(sx))
1048 DEBUG(D_transport) debug_printf("bad response for EHLO\n");
1049 if (tls_out.active.sock >= 0) rc = DEFER;
1053 /* Compare the actual EHLO response extensions and AUTH methods to the cached
1054 value we assumed; on difference, dump or rewrite the cache and arrange for a
1057 ap = tls_out.active.sock < 0
1058 ? &sx->ehlo_resp.cleartext_auths : &sx->ehlo_resp.crypted_auths;
1060 peer_offered = ehlo_response(sx->buffer,
1061 (tls_out.active.sock < 0 ? OPTION_TLS : 0)
1062 | OPTION_CHUNKING | OPTION_PRDR | OPTION_DSN | OPTION_PIPE | OPTION_SIZE
1063 | OPTION_UTF8 | OPTION_EARLY_PIPE
1065 #ifdef EXPERIMENTAL_ESMTP_LIMITS
1066 if (tls_out.active.sock >= 0 || !(peer_offered & OPTION_TLS))
1067 ehlo_response_limits_read(sx);
1069 if ( peer_offered != sx->peer_offered
1070 || (authbits = study_ehlo_auths(sx)) != *ap)
1073 debug_printf("EHLO %s extensions changed, 0x%04x/0x%04x -> 0x%04x/0x%04x\n",
1074 tls_out.active.sock < 0 ? "cleartext" : "crypted",
1075 sx->peer_offered, *ap, peer_offered, authbits);
1076 if (peer_offered & OPTION_EARLY_PIPE)
1078 *(tls_out.active.sock < 0
1079 ? &sx->ehlo_resp.cleartext_features : &sx->ehlo_resp.crypted_features) =
1082 write_ehlo_cache_entry(sx);
1085 invalidate_ehlo_cache_entry(sx);
1087 return OK; /* just carry on */
1089 #ifdef EXPERIMENTAL_ESMTP_LIMITS
1090 /* If we are handling LIMITS, compare the actual EHLO LIMITS values with the
1091 cached values and invalidate cache if different. OK to carry on with
1092 connect since values are advisory. */
1094 if ( (tls_out.active.sock >= 0 || !(peer_offered & OPTION_TLS))
1095 && ( sx->peer_limit_mail != sx->ehlo_resp.limit_mail
1096 || sx->peer_limit_rcpt != sx->ehlo_resp.limit_rcpt
1097 || sx->peer_limit_rcptdom != sx->ehlo_resp.limit_rcptdom
1102 debug_printf("EHLO LIMITS changed:");
1103 if (sx->peer_limit_mail != sx->ehlo_resp.limit_mail)
1104 debug_printf(" MAILMAX %u -> %u\n", sx->ehlo_resp.limit_mail, sx->peer_limit_mail);
1105 else if (sx->peer_limit_rcpt != sx->ehlo_resp.limit_rcpt)
1106 debug_printf(" RCPTMAX %u -> %u\n", sx->ehlo_resp.limit_rcpt, sx->peer_limit_rcpt);
1108 debug_printf(" RCPTDOMAINMAX %u -> %u\n", sx->ehlo_resp.limit_rcptdom, sx->peer_limit_rcptdom);
1110 invalidate_ehlo_cache_entry(sx);
1118 invalidate_ehlo_cache_entry(sx);
1119 (void) smtp_discard_responses(sx, sx->conn_args.ob, *countp);
1122 #endif /*!DISABLE_PIPE_CONNECT*/
1125 /*************************************************
1126 * Synchronize SMTP responses *
1127 *************************************************/
1129 /* This function is called from smtp_deliver() to receive SMTP responses from
1130 the server, and match them up with the commands to which they relate. When
1131 PIPELINING is not in use, this function is called after every command, and is
1132 therefore somewhat over-engineered, but it is simpler to use a single scheme
1133 that works both with and without PIPELINING instead of having two separate sets
1136 The set of commands that are buffered up with pipelining may start with MAIL
1137 and may end with DATA; in between are RCPT commands that correspond to the
1138 addresses whose status is PENDING_DEFER. All other commands (STARTTLS, AUTH,
1139 etc.) are never buffered.
1141 Errors after MAIL or DATA abort the whole process leaving the response in the
1142 buffer. After MAIL, pending responses are flushed, and the original command is
1143 re-instated in big_buffer for error messages. For RCPT commands, the remote is
1144 permitted to reject some recipient addresses while accepting others. However
1145 certain errors clearly abort the whole process. Set the value in
1146 transport_return to PENDING_OK if the address is accepted. If there is a
1147 subsequent general error, it will get reset accordingly. If not, it will get
1148 converted to OK at the end.
1151 sx smtp connection context
1152 count the number of responses to read
1153 pending_DATA 0 if last command sent was not DATA
1154 +1 if previously had a good recipient
1155 -1 if not previously had a good recipient
1157 Returns: 3 if at least one address had 2xx and one had 5xx
1158 2 if at least one address had 5xx but none had 2xx
1159 1 if at least one host had a 2xx response, but none had 5xx
1160 0 no address had 2xx or 5xx but no errors (all 4xx, or just DATA)
1161 -1 timeout while reading RCPT response
1162 -2 I/O or other non-response error for RCPT
1163 -3 DATA or MAIL failed - errno and buffer set
1164 -4 banner or EHLO failed (early-pipelining)
1165 -5 banner or EHLO failed (early-pipelining, TLS)
1169 sync_responses(smtp_context * sx, int count, int pending_DATA)
1171 address_item * addr = sx->sync_addr;
1172 smtp_transport_options_block * ob = sx->conn_args.ob;
1175 #ifndef DISABLE_PIPE_CONNECT
1177 if ((rc = smtp_reap_early_pipe(sx, &count)) != OK)
1178 return rc == FAIL ? -4 : -5;
1181 /* Handle the response for a MAIL command. On error, reinstate the original
1182 command in big_buffer for error message use, and flush any further pending
1183 responses before returning, except after I/O errors and timeouts. */
1185 if (sx->pending_MAIL)
1187 DEBUG(D_transport) debug_printf("%s expect mail\n", __FUNCTION__);
1189 sx->pending_MAIL = sx->RCPT_452 = FALSE;
1190 if (!smtp_read_response(sx, sx->buffer, sizeof(sx->buffer),
1191 '2', ob->command_timeout))
1193 DEBUG(D_transport) debug_printf("bad response for MAIL\n");
1194 Ustrcpy(big_buffer, mail_command); /* Fits, because it came from there! */
1195 if (errno == ERRNO_TLSFAILURE)
1197 if (errno == 0 && sx->buffer[0] != 0)
1200 if (sx->buffer[0] == '4')
1202 save_errno = ERRNO_MAIL4XX;
1203 addr->more_errno |= ((sx->buffer[1] - '0')*10 + sx->buffer[2] - '0') << 8;
1205 count = smtp_discard_responses(sx, ob, count);
1209 if (pending_DATA) count--; /* Number of RCPT responses to come */
1210 while (count-- > 0) /* Mark any pending addrs with the host used */
1212 while (addr->transport_return != PENDING_DEFER) addr = addr->next;
1213 addr->host_used = sx->conn_args.host;
1220 if (pending_DATA) count--; /* Number of RCPT responses to come */
1222 /* Read and handle the required number of RCPT responses, matching each one up
1223 with an address by scanning for the next address whose status is PENDING_DEFER.
1228 while (addr->transport_return != PENDING_DEFER)
1229 if (!(addr = addr->next))
1232 /* The address was accepted */
1233 addr->host_used = sx->conn_args.host;
1235 DEBUG(D_transport) debug_printf("%s expect rcpt for %s\n", __FUNCTION__, addr->address);
1236 if (smtp_read_response(sx, sx->buffer, sizeof(sx->buffer),
1237 '2', ob->command_timeout))
1240 addr->transport_return = PENDING_OK;
1242 /* If af_dr_retry_exists is set, there was a routing delay on this address;
1243 ensure that any address-specific retry record is expunged. We do this both
1244 for the basic key and for the version that also includes the sender. */
1246 if (testflag(addr, af_dr_retry_exists))
1248 uschar *altkey = string_sprintf("%s:<%s>", addr->address_retry_key,
1250 retry_add_item(addr, altkey, rf_delete);
1251 retry_add_item(addr, addr->address_retry_key, rf_delete);
1255 /* Error on first TLS read */
1257 else if (errno == ERRNO_TLSFAILURE)
1260 /* Timeout while reading the response */
1262 else if (errno == ETIMEDOUT)
1264 uschar *message = string_sprintf("SMTP timeout after RCPT TO:<%s>",
1265 transport_rcpt_address(addr, sx->conn_args.tblock->rcpt_include_affixes));
1266 set_errno_nohost(sx->first_addr, ETIMEDOUT, message, DEFER, FALSE, &sx->delivery_start);
1267 retry_add_item(addr, addr->address_retry_key, 0);
1268 update_waiting = FALSE;
1272 /* Handle other errors in obtaining an SMTP response by returning -1. This
1273 will cause all the addresses to be deferred. Restore the SMTP command in
1274 big_buffer for which we are checking the response, so the error message
1277 else if (errno != 0 || sx->buffer[0] == 0)
1279 gstring gs = { .size = big_buffer_size, .ptr = 0, .s = big_buffer }, * g = &gs;
1281 /* Use taint-unchecked routines for writing into big_buffer, trusting
1282 that we'll never expand it. */
1284 g = string_fmt_append_f(g, SVFMT_TAINT_NOCHK, "RCPT TO:<%s>",
1285 transport_rcpt_address(addr, sx->conn_args.tblock->rcpt_include_affixes));
1286 string_from_gstring(g);
1290 /* Handle SMTP permanent and temporary response codes. */
1295 string_sprintf("SMTP error from remote mail server after RCPT TO:<%s>: "
1296 "%s", transport_rcpt_address(addr, sx->conn_args.tblock->rcpt_include_affixes),
1297 string_printing(sx->buffer));
1298 setflag(addr, af_pass_message);
1300 msglog_line(sx->conn_args.host, addr->message);
1302 /* The response was 5xx */
1304 if (sx->buffer[0] == '5')
1306 addr->transport_return = FAIL;
1310 /* The response was 4xx */
1314 addr->transport_return = DEFER;
1315 addr->basic_errno = ERRNO_RCPT4XX;
1316 addr->more_errno |= ((sx->buffer[1] - '0')*10 + sx->buffer[2] - '0') << 8;
1320 #ifndef DISABLE_EVENT
1321 event_defer_errno = addr->more_errno;
1322 msg_event_raise(US"msg:rcpt:host:defer", addr);
1324 /* If a 452 and we've had at least one 2xx or 5xx, set next_addr to the
1325 start point for another MAIL command. */
1327 if (addr->more_errno >> 8 == 52 && yield & 3)
1329 if (!sx->RCPT_452) /* initialised at MAIL-ack above */
1332 debug_printf("%s: seen first 452 too-many-rcpts\n", __FUNCTION__);
1333 sx->RCPT_452 = TRUE;
1334 sx->next_addr = addr;
1336 addr->transport_return = PENDING_DEFER;
1337 addr->basic_errno = 0;
1341 /* Log temporary errors if there are more hosts to be tried.
1342 If not, log this last one in the == line. */
1344 if (sx->conn_args.host->next)
1345 if (LOGGING(outgoing_port))
1346 log_write(0, LOG_MAIN, "H=%s [%s]:%d %s", sx->conn_args.host->name,
1347 sx->conn_args.host->address,
1348 sx->port == PORT_NONE ? 25 : sx->port, addr->message);
1350 log_write(0, LOG_MAIN, "H=%s [%s]: %s", sx->conn_args.host->name,
1351 sx->conn_args.host->address, addr->message);
1353 #ifndef DISABLE_EVENT
1355 msg_event_raise(US"msg:rcpt:defer", addr);
1358 /* Do not put this message on the list of those waiting for specific
1359 hosts, as otherwise it is likely to be tried too often. */
1361 update_waiting = FALSE;
1363 /* Add a retry item for the address so that it doesn't get tried again
1364 too soon. If address_retry_include_sender is true, add the sender address
1365 to the retry key. */
1367 retry_add_item(addr,
1368 ob->address_retry_include_sender
1369 ? string_sprintf("%s:<%s>", addr->address_retry_key, sender_address)
1370 : addr->address_retry_key,
1376 if (count && !(addr = addr->next))
1378 } /* Loop for next RCPT response */
1380 /* Update where to start at for the next block of responses, unless we
1381 have already handled all the addresses. */
1383 if (addr) sx->sync_addr = addr->next;
1385 /* Handle a response to DATA. If we have not had any good recipients, either
1386 previously or in this block, the response is ignored. */
1388 if (pending_DATA != 0)
1390 DEBUG(D_transport) debug_printf("%s expect data\n", __FUNCTION__);
1391 if (!smtp_read_response(sx, sx->buffer, sizeof(sx->buffer),
1392 '3', ob->command_timeout))
1398 if (errno == ERRNO_TLSFAILURE) /* Error on first TLS read */
1401 if (pending_DATA > 0 || (yield & 1) != 0)
1403 if (errno == 0 && sx->buffer[0] == '4')
1405 errno = ERRNO_DATA4XX;
1406 sx->first_addr->more_errno |= ((sx->buffer[1] - '0')*10 + sx->buffer[2] - '0') << 8;
1410 (void)check_response(sx->conn_args.host, &errno, 0, sx->buffer, &code, &msg, &pass_message);
1411 DEBUG(D_transport) debug_printf("%s\nerror for DATA ignored: pipelining "
1412 "is in use and there were no good recipients\n", msg);
1416 /* All responses read and handled; MAIL (if present) received 2xx and DATA (if
1417 present) received 3xx. If any RCPTs were handled and yielded anything other
1418 than 4xx, yield will be set non-zero. */
1427 /* Try an authenticator's client entry */
1430 try_authenticator(smtp_context * sx, auth_instance * au)
1432 smtp_transport_options_block * ob = sx->conn_args.ob; /* transport options */
1433 host_item * host = sx->conn_args.host; /* host to deliver to */
1436 sx->outblock.authenticating = TRUE;
1437 rc = (au->info->clientcode)(au, sx, ob->command_timeout,
1438 sx->buffer, sizeof(sx->buffer));
1439 sx->outblock.authenticating = FALSE;
1440 DEBUG(D_transport) debug_printf("%s authenticator yielded %d\n", au->name, rc);
1442 /* A temporary authentication failure must hold up delivery to
1443 this host. After a permanent authentication failure, we carry on
1444 to try other authentication methods. If all fail hard, try to
1445 deliver the message unauthenticated unless require_auth was set. */
1450 f.smtp_authenticated = TRUE; /* stops the outer loop */
1451 client_authenticator = au->name;
1452 if (au->set_client_id)
1453 client_authenticated_id = expand_string(au->set_client_id);
1456 /* Failure after writing a command */
1461 /* Failure after reading a response */
1464 if (errno != 0 || sx->buffer[0] != '5') return FAIL;
1465 log_write(0, LOG_MAIN, "%s authenticator failed H=%s [%s] %s",
1466 au->name, host->name, host->address, sx->buffer);
1469 /* Failure by some other means. In effect, the authenticator
1470 decided it wasn't prepared to handle this case. Typically this
1471 is the result of "fail" in an expansion string. Do we need to
1472 log anything here? Feb 2006: a message is now put in the buffer
1473 if logging is required. */
1476 if (*sx->buffer != 0)
1477 log_write(0, LOG_MAIN, "%s authenticator cancelled "
1478 "authentication H=%s [%s] %s", au->name, host->name,
1479 host->address, sx->buffer);
1482 /* Internal problem, message in buffer. */
1485 set_errno_nohost(sx->addrlist, ERRNO_AUTHPROB, string_copy(sx->buffer),
1486 DEFER, FALSE, &sx->delivery_start);
1495 /* Do the client side of smtp-level authentication.
1498 sx smtp connection context
1500 sx->buffer should have the EHLO response from server (gets overwritten)
1503 OK Success, or failed (but not required): global "smtp_authenticated" set
1504 DEFER Failed authentication (and was required)
1505 ERROR Internal problem
1507 FAIL_SEND Failed communications - transmit
1512 smtp_auth(smtp_context * sx)
1514 host_item * host = sx->conn_args.host; /* host to deliver to */
1515 smtp_transport_options_block * ob = sx->conn_args.ob; /* transport options */
1516 int require_auth = verify_check_given_host(CUSS &ob->hosts_require_auth, host);
1517 #ifndef DISABLE_PIPE_CONNECT
1518 unsigned short authbits = tls_out.active.sock >= 0
1519 ? sx->ehlo_resp.crypted_auths : sx->ehlo_resp.cleartext_auths;
1521 uschar * fail_reason = US"server did not advertise AUTH support";
1523 f.smtp_authenticated = FALSE;
1524 client_authenticator = client_authenticated_id = client_authenticated_sender = NULL;
1527 regex_AUTH = regex_must_compile(AUTHS_REGEX, FALSE, TRUE);
1529 /* Is the server offering AUTH? */
1533 #ifndef DISABLE_PIPE_CONNECT
1534 sx->early_pipe_active ? authbits
1537 regex_match_and_setup(regex_AUTH, sx->buffer, 0, -1)
1540 uschar * names = NULL;
1541 expand_nmax = -1; /* reset */
1543 #ifndef DISABLE_PIPE_CONNECT
1544 if (!sx->early_pipe_active)
1546 names = string_copyn(expand_nstring[1], expand_nlength[1]);
1548 /* Must not do this check until after we have saved the result of the
1549 regex match above as the check could be another RE. */
1551 if ( require_auth == OK
1552 || verify_check_given_host(CUSS &ob->hosts_try_auth, host) == OK)
1554 DEBUG(D_transport) debug_printf("scanning authentication mechanisms\n");
1555 fail_reason = US"no common mechanisms were found";
1557 #ifndef DISABLE_PIPE_CONNECT
1558 if (sx->early_pipe_active)
1560 /* Scan our authenticators (which support use by a client and were offered
1561 by the server (checked at cache-write time)), not suppressed by
1562 client_condition. If one is found, attempt to authenticate by calling its
1563 client function. We are limited to supporting up to 16 authenticator
1564 public-names by the number of bits in a short. */
1570 for (bitnum = 0, au = auths;
1571 !f.smtp_authenticated && au && bitnum < 16;
1572 bitnum++, au = au->next) if (authbits & BIT(bitnum))
1574 if ( au->client_condition
1575 && !expand_check_condition(au->client_condition, au->name,
1576 US"client authenticator"))
1578 DEBUG(D_transport) debug_printf("skipping %s authenticator: %s\n",
1579 au->name, "client_condition is false");
1583 /* Found data for a listed mechanism. Call its client entry. Set
1584 a flag in the outblock so that data is overwritten after sending so
1585 that reflections don't show it. */
1587 fail_reason = US"authentication attempt(s) failed";
1589 if ((rc = try_authenticator(sx, au)) != OK)
1596 /* Scan the configured authenticators looking for one which is configured
1597 for use as a client, which is not suppressed by client_condition, and
1598 whose name matches an authentication mechanism supported by the server.
1599 If one is found, attempt to authenticate by calling its client function.
1602 for (auth_instance * au = auths; !f.smtp_authenticated && au; au = au->next)
1607 || ( au->client_condition
1608 && !expand_check_condition(au->client_condition, au->name,
1609 US"client authenticator")))
1611 DEBUG(D_transport) debug_printf("skipping %s authenticator: %s\n",
1613 (au->client)? "client_condition is false" :
1614 "not configured as a client");
1618 /* Loop to scan supported server mechanisms */
1622 int len = Ustrlen(au->public_name);
1625 while (isspace(*p)) p++;
1627 if (strncmpic(au->public_name, p, len) != 0 ||
1628 (p[len] != 0 && !isspace(p[len])))
1630 while (*p != 0 && !isspace(*p)) p++;
1634 /* Found data for a listed mechanism. Call its client entry. Set
1635 a flag in the outblock so that data is overwritten after sending so
1636 that reflections don't show it. */
1638 fail_reason = US"authentication attempt(s) failed";
1640 if ((rc = try_authenticator(sx, au)) != OK)
1643 break; /* If not authenticated, try next authenticator */
1644 } /* Loop for scanning supported server mechanisms */
1645 } /* Loop for further authenticators */
1649 /* If we haven't authenticated, but are required to, give up. */
1651 if (require_auth == OK && !f.smtp_authenticated)
1653 #ifndef DISABLE_PIPE_CONNECT
1654 invalidate_ehlo_cache_entry(sx);
1656 set_errno_nohost(sx->addrlist, ERRNO_AUTHFAIL,
1657 string_sprintf("authentication required but %s", fail_reason), DEFER,
1658 FALSE, &sx->delivery_start);
1666 /* Construct AUTH appendix string for MAIL TO */
1669 sx context for smtp connection
1670 p point in sx->buffer to build string
1671 addrlist chain of potential addresses to deliver
1673 Globals f.smtp_authenticated
1674 client_authenticated_sender
1675 Return True on error, otherwise buffer has (possibly empty) terminated string
1679 smtp_mail_auth_str(smtp_context * sx, uschar * p, address_item * addrlist)
1681 smtp_transport_options_block * ob = sx->conn_args.ob;
1682 uschar * local_authenticated_sender = authenticated_sender;
1685 debug_printf("smtp_mail_auth_str: as<%s> os<%s> SA<%s>\n",
1686 authenticated_sender, ob->authenticated_sender, f.smtp_authenticated?"Y":"N");
1689 if (ob->authenticated_sender)
1691 uschar * new = expand_string(ob->authenticated_sender);
1694 if (!f.expand_string_forcedfail)
1696 uschar *message = string_sprintf("failed to expand "
1697 "authenticated_sender: %s", expand_string_message);
1698 set_errno_nohost(addrlist, ERRNO_EXPANDFAIL, message, DEFER, FALSE, &sx->delivery_start);
1703 local_authenticated_sender = new;
1706 /* Add the authenticated sender address if present */
1708 if ( (f.smtp_authenticated || ob->authenticated_sender_force)
1709 && local_authenticated_sender)
1711 string_format_nt(p, sizeof(sx->buffer) - (p-sx->buffer), " AUTH=%s",
1712 auth_xtextencode(local_authenticated_sender,
1713 Ustrlen(local_authenticated_sender)));
1714 client_authenticated_sender = string_copy(local_authenticated_sender);
1724 typedef struct smtp_compare_s
1726 uschar * current_sender_address;
1727 struct transport_instance * tblock;
1731 /* Create a unique string that identifies this message, it is based on
1732 sender_address, helo_data and tls_certificate if enabled.
1736 smtp_local_identity(uschar * sender, struct transport_instance * tblock)
1738 address_item * addr1;
1739 uschar * if1 = US"";
1740 uschar * helo1 = US"";
1742 uschar * tlsc1 = US"";
1744 uschar * save_sender_address = sender_address;
1745 uschar * local_identity = NULL;
1746 smtp_transport_options_block * ob = SOB tblock->options_block;
1748 sender_address = sender;
1750 addr1 = deliver_make_addr (sender, TRUE);
1751 deliver_set_expansions(addr1);
1754 if1 = expand_string(ob->interface);
1757 helo1 = expand_string(ob->helo_data);
1760 if (ob->tls_certificate)
1761 tlsc1 = expand_string(ob->tls_certificate);
1762 local_identity = string_sprintf ("%s^%s^%s", if1, helo1, tlsc1);
1764 local_identity = string_sprintf ("%s^%s", if1, helo1);
1767 deliver_set_expansions(NULL);
1768 sender_address = save_sender_address;
1770 return local_identity;
1775 /* This routine is a callback that is called from transport_check_waiting.
1776 This function will evaluate the incoming message versus the previous
1777 message. If the incoming message is using a different local identity then
1778 we will veto this new message. */
1781 smtp_are_same_identities(uschar * message_id, smtp_compare_t * s_compare)
1783 uschar * message_local_identity,
1784 * current_local_identity,
1785 * new_sender_address;
1787 current_local_identity =
1788 smtp_local_identity(s_compare->current_sender_address, s_compare->tblock);
1790 if (!(new_sender_address = spool_sender_from_msgid(message_id)))
1794 message_local_identity =
1795 smtp_local_identity(new_sender_address, s_compare->tblock);
1797 return Ustrcmp(current_local_identity, message_local_identity) == 0;
1803 ehlo_response(uschar * buf, unsigned checks)
1805 PCRE2_SIZE bsize = Ustrlen(buf);
1806 pcre2_match_data * md = pcre2_match_data_create(1, pcre_gen_ctx);
1808 /* debug_printf("%s: check for 0x%04x\n", __FUNCTION__, checks); */
1811 if ( checks & OPTION_TLS
1812 && pcre2_match(regex_STARTTLS,
1813 (PCRE2_SPTR)buf, bsize, 0, PCRE_EOPT, md, pcre_mtc_ctx) < 0)
1815 checks &= ~OPTION_TLS;
1817 if ( checks & OPTION_IGNQ
1818 && pcre2_match(regex_IGNOREQUOTA,
1819 (PCRE2_SPTR)buf, bsize, 0, PCRE_EOPT, md, pcre_mtc_ctx) < 0)
1820 checks &= ~OPTION_IGNQ;
1822 if ( checks & OPTION_CHUNKING
1823 && pcre2_match(regex_CHUNKING,
1824 (PCRE2_SPTR)buf, bsize, 0, PCRE_EOPT, md, pcre_mtc_ctx) < 0)
1825 checks &= ~OPTION_CHUNKING;
1827 #ifndef DISABLE_PRDR
1828 if ( checks & OPTION_PRDR
1829 && pcre2_match(regex_PRDR,
1830 (PCRE2_SPTR)buf, bsize, 0, PCRE_EOPT, md, pcre_mtc_ctx) < 0)
1832 checks &= ~OPTION_PRDR;
1835 if ( checks & OPTION_UTF8
1836 && pcre2_match(regex_UTF8,
1837 (PCRE2_SPTR)buf, bsize, 0, PCRE_EOPT, md, pcre_mtc_ctx) < 0)
1839 checks &= ~OPTION_UTF8;
1841 if ( checks & OPTION_DSN
1842 && pcre2_match(regex_DSN,
1843 (PCRE2_SPTR)buf, bsize, 0, PCRE_EOPT, md, pcre_mtc_ctx) < 0)
1844 checks &= ~OPTION_DSN;
1846 if ( checks & OPTION_PIPE
1847 && pcre2_match(regex_PIPELINING,
1848 (PCRE2_SPTR)buf, bsize, 0, PCRE_EOPT, md, pcre_mtc_ctx) < 0)
1849 checks &= ~OPTION_PIPE;
1851 if ( checks & OPTION_SIZE
1852 && pcre2_match(regex_SIZE,
1853 (PCRE2_SPTR)buf, bsize, 0, PCRE_EOPT, md, pcre_mtc_ctx) < 0)
1854 checks &= ~OPTION_SIZE;
1856 #ifndef DISABLE_PIPE_CONNECT
1857 if ( checks & OPTION_EARLY_PIPE
1858 && pcre2_match(regex_EARLY_PIPE,
1859 (PCRE2_SPTR)buf, bsize, 0, PCRE_EOPT, md, pcre_mtc_ctx) < 0)
1861 checks &= ~OPTION_EARLY_PIPE;
1863 pcre2_match_data_free(md);
1864 /* debug_printf("%s: found 0x%04x\n", __FUNCTION__, checks); */
1870 /* Callback for emitting a BDAT data chunk header.
1872 If given a nonzero size, first flush any buffered SMTP commands
1873 then emit the command.
1875 Reap previous SMTP command responses if requested, and always reap
1876 the response from a previous BDAT command.
1879 tctx transport context
1880 chunk_size value for SMTP BDAT command
1882 tc_chunk_last add LAST option to SMTP BDAT command
1883 tc_reap_prev reap response to previous SMTP commands
1887 DEFER TLS error on first read (EHLO-resp); errno set
1891 smtp_chunk_cmd_callback(transport_ctx * tctx, unsigned chunk_size,
1894 smtp_transport_options_block * ob = SOB tctx->tblock->options_block;
1895 smtp_context * sx = tctx->smtp_context;
1899 /* Write SMTP chunk header command. If not reaping responses, note that
1900 there may be more writes (like, the chunk data) done soon. */
1904 #ifndef DISABLE_PIPE_CONNECT
1905 BOOL new_conn = !!(sx->outblock.conn_args);
1907 if((cmd_count = smtp_write_command(sx,
1908 flags & tc_reap_prev ? SCMD_FLUSH : SCMD_MORE,
1909 "BDAT %u%s\r\n", chunk_size, flags & tc_chunk_last ? " LAST" : "")
1910 ) < 0) return ERROR;
1911 if (flags & tc_chunk_last)
1912 data_command = string_copy(big_buffer); /* Save for later error message */
1913 #ifndef DISABLE_PIPE_CONNECT
1914 /* That command write could have been the one that made the connection.
1915 Copy the fd from the client conn ctx (smtp transport specific) to the
1916 generic transport ctx. */
1919 tctx->u.fd = sx->outblock.cctx->sock;
1923 prev_cmd_count = cmd_count += sx->cmd_count;
1925 /* Reap responses for any previous, but not one we just emitted */
1929 if (sx->pending_BDAT)
1932 if (flags & tc_reap_prev && prev_cmd_count > 0)
1934 DEBUG(D_transport) debug_printf("look for %d responses"
1935 " for previous pipelined cmds\n", prev_cmd_count);
1937 switch(sync_responses(sx, prev_cmd_count, 0))
1939 case 1: /* 2xx (only) => OK */
1940 case 3: sx->good_RCPT = TRUE; /* 2xx & 5xx => OK & progress made */
1941 case 2: sx->completed_addr = TRUE; /* 5xx (only) => progress made */
1942 case 0: break; /* No 2xx or 5xx, but no probs */
1944 case -5: errno = ERRNO_TLSFAILURE;
1946 #ifndef DISABLE_PIPE_CONNECT
1947 case -4: /* non-2xx for pipelined banner or EHLO */
1949 case -1: /* Timeout on RCPT */
1950 default: return ERROR; /* I/O error, or any MAIL/DATA error */
1953 if (!sx->pending_BDAT)
1954 pipelining_active = FALSE;
1957 /* Reap response for an outstanding BDAT */
1959 if (sx->pending_BDAT)
1961 DEBUG(D_transport) debug_printf("look for one response for BDAT\n");
1963 if (!smtp_read_response(sx, sx->buffer, sizeof(sx->buffer), '2',
1964 ob->command_timeout))
1966 if (errno == 0 && sx->buffer[0] == '4')
1968 errno = ERRNO_DATA4XX; /*XXX does this actually get used? */
1969 sx->addrlist->more_errno |=
1970 ((sx->buffer[1] - '0')*10 + sx->buffer[2] - '0') << 8;
1975 sx->pending_BDAT = FALSE;
1976 pipelining_active = FALSE;
1978 else if (chunk_size > 0)
1979 sx->pending_BDAT = TRUE;
1982 sx->cmd_count = cmd_count;
1988 /*************************************************
1989 * Make connection for given message *
1990 *************************************************/
1994 sx connection context
1995 suppress_tls if TRUE, don't attempt a TLS connection - this is set for
1996 a second attempt after TLS initialization fails
1998 Returns: OK - the connection was made and the delivery attempted;
1999 fd is set in the conn context, tls_out set up.
2000 DEFER - the connection could not be made, or something failed
2001 while setting up the SMTP session, or there was a
2002 non-message-specific error, such as a timeout.
2003 ERROR - helo_data or add_headers or authenticated_sender is
2004 specified for this transport, and the string failed
2008 smtp_setup_conn(smtp_context * sx, BOOL suppress_tls)
2010 smtp_transport_options_block * ob = sx->conn_args.tblock->options_block;
2011 BOOL pass_message = FALSE;
2012 uschar * message = NULL;
2015 uschar * tls_errstr;
2018 /* Many lines of clearing individual elements of *sx that used to
2019 be here have been replaced by a full memset to zero (de41aff051).
2020 There are two callers, this file and verify.c . Now we only set
2021 up nonzero elements. */
2023 sx->conn_args.ob = ob;
2025 sx->lmtp = strcmpic(ob->protocol, US"lmtp") == 0;
2026 sx->smtps = strcmpic(ob->protocol, US"smtps") == 0;
2027 sx->send_rset = TRUE;
2028 sx->send_quit = TRUE;
2029 sx->setting_up = TRUE;
2031 sx->dsn_all_lasthop = TRUE;
2034 verify_check_given_host(CUSS &ob->hosts_require_dane, sx->conn_args.host) == OK;
2037 if ((sx->max_mail = sx->conn_args.tblock->connection_max_messages) == 0) sx->max_mail = 999999;
2038 if ((sx->max_rcpt = sx->conn_args.tblock->max_addresses) == 0) sx->max_rcpt = 999999;
2039 sx->igquotstr = US"";
2040 if (!sx->helo_data) sx->helo_data = ob->helo_data;
2042 smtp_command = US"initial connection";
2044 /* Set up the buffer for reading SMTP response packets. */
2046 sx->inblock.buffer = sx->inbuffer;
2047 sx->inblock.buffersize = sizeof(sx->inbuffer);
2048 sx->inblock.ptr = sx->inbuffer;
2049 sx->inblock.ptrend = sx->inbuffer;
2051 /* Set up the buffer for holding SMTP commands while pipelining */
2053 sx->outblock.buffer = sx->outbuffer;
2054 sx->outblock.buffersize = sizeof(sx->outbuffer);
2055 sx->outblock.ptr = sx->outbuffer;
2057 /* Reset the parameters of a TLS session. */
2060 tls_out.cipher = NULL; /* the one we may use for this transport */
2061 tls_out.ourcert = NULL;
2062 tls_out.peercert = NULL;
2063 tls_out.peerdn = NULL;
2067 tls_out.ocsp = OCSP_NOT_REQ;
2068 #ifndef DISABLE_TLS_RESUME
2069 tls_out.resumption = 0;
2073 /* Flip the legacy TLS-related variables over to the outbound set in case
2074 they're used in the context of the transport. Don't bother resetting
2075 afterward (when being used by a transport) as we're in a subprocess.
2076 For verify, unflipped once the callout is dealt with */
2078 tls_modify_variables(&tls_out);
2083 set_errno_nohost(sx->addrlist, ERRNO_TLSFAILURE, US"TLS support not available",
2084 DEFER, FALSE, &sx->delivery_start);
2089 /* If we have a proxied TLS connection, check usability for this message */
2091 if (continue_hostname && continue_proxy_cipher)
2094 const uschar * sni = US"";
2096 # ifdef SUPPORT_DANE
2097 /* Check if the message will be DANE-verified; if so force its SNI */
2099 tls_out.dane_verified = FALSE;
2100 smtp_port_for_connect(sx->conn_args.host, sx->port);
2101 if ( sx->conn_args.host->dnssec == DS_YES
2102 && ( sx->dane_required
2103 || verify_check_given_host(CUSS &ob->hosts_try_dane, sx->conn_args.host) == OK
2105 switch (rc = tlsa_lookup(sx->conn_args.host, &sx->conn_args.tlsa_dnsa, sx->dane_required))
2107 case OK: sx->conn_args.dane = TRUE;
2108 ob->tls_tempfail_tryclear = FALSE; /* force TLS */
2109 ob->tls_sni = sx->conn_args.host->name; /* force SNI */
2111 case FAIL_FORCED: break;
2112 default: set_errno_nohost(sx->addrlist, ERRNO_DNSDEFER,
2113 string_sprintf("DANE error: tlsa lookup %s",
2115 rc, FALSE, &sx->delivery_start);
2116 # ifndef DISABLE_EVENT
2117 (void) event_raise(sx->conn_args.tblock->event_action,
2118 US"dane:fail", sx->dane_required
2119 ? US"dane-required" : US"dnssec-invalid",
2126 /* If the SNI or the DANE status required for the new message differs from the
2127 existing conn drop the connection to force a new one. */
2129 if (ob->tls_sni && !(sni = expand_cstring(ob->tls_sni)))
2130 log_write(0, LOG_MAIN|LOG_PANIC,
2131 "<%s>: failed to expand transport's tls_sni value: %s",
2132 sx->addrlist->address, expand_string_message);
2134 # ifdef SUPPORT_DANE
2135 if ( (continue_proxy_sni ? (Ustrcmp(continue_proxy_sni, sni) == 0) : !*sni)
2136 && continue_proxy_dane == sx->conn_args.dane)
2138 tls_out.sni = US sni;
2139 if ((tls_out.dane_verified = continue_proxy_dane))
2140 sx->conn_args.host->dnssec = DS_YES;
2143 if ((continue_proxy_sni ? (Ustrcmp(continue_proxy_sni, sni) == 0) : !*sni))
2144 tls_out.sni = US sni;
2149 debug_printf("Closing proxied-TLS connection due to SNI mismatch\n");
2151 HDEBUG(D_transport|D_acl|D_v) debug_printf_indent(" SMTP>> QUIT\n");
2152 write(0, "QUIT\r\n", 6);
2154 continue_hostname = continue_proxy_cipher = NULL;
2155 f.continue_more = FALSE;
2156 continue_sequence = 1; /* Unfortunately, this process cannot affect success log
2157 which is done by delivery proc. Would have to pass this
2158 back through reporting pipe. */
2161 #endif /*!DISABLE_TLS*/
2163 /* Make a connection to the host if this isn't a continued delivery, and handle
2164 the initial interaction and HELO/EHLO/LHLO. Connect timeout errors are handled
2165 specially so they can be identified for retries. */
2167 if (!continue_hostname)
2170 HDEBUG(D_verify) debug_printf("interface=%s port=%d\n", sx->conn_args.interface, sx->port);
2172 /* Arrange to report to calling process this is a new connection */
2174 clearflag(sx->first_addr, af_cont_conn);
2175 setflag(sx->first_addr, af_new_conn);
2177 /* Get the actual port the connection will use, into sx->conn_args.host */
2179 smtp_port_for_connect(sx->conn_args.host, sx->port);
2182 /* Do TLSA lookup for DANE */
2184 tls_out.dane_verified = FALSE;
2185 tls_out.tlsa_usage = 0;
2187 if (sx->conn_args.host->dnssec == DS_YES)
2190 if( sx->dane_required
2191 || verify_check_given_host(CUSS &ob->hosts_try_dane, sx->conn_args.host) == OK
2193 switch (rc = tlsa_lookup(sx->conn_args.host, &sx->conn_args.tlsa_dnsa, sx->dane_required))
2195 case OK: sx->conn_args.dane = TRUE;
2196 ob->tls_tempfail_tryclear = FALSE; /* force TLS */
2197 ob->tls_sni = sx->conn_args.host->name; /* force SNI */
2199 case FAIL_FORCED: break;
2200 default: set_errno_nohost(sx->addrlist, ERRNO_DNSDEFER,
2201 string_sprintf("DANE error: tlsa lookup %s",
2203 rc, FALSE, &sx->delivery_start);
2204 # ifndef DISABLE_EVENT
2205 (void) event_raise(sx->conn_args.tblock->event_action,
2206 US"dane:fail", sx->dane_required
2207 ? US"dane-required" : US"dnssec-invalid",
2213 else if (sx->dane_required)
2215 set_errno_nohost(sx->addrlist, ERRNO_DNSDEFER,
2216 string_sprintf("DANE error: %s lookup not DNSSEC", sx->conn_args.host->name),
2217 FAIL, FALSE, &sx->delivery_start);
2218 # ifndef DISABLE_EVENT
2219 (void) event_raise(sx->conn_args.tblock->event_action,
2220 US"dane:fail", US"dane-required", NULL);
2227 /* Make the TCP connection */
2229 sx->cctx.tls_ctx = NULL;
2230 sx->inblock.cctx = sx->outblock.cctx = &sx->cctx;
2231 #ifdef EXPERIMENTAL_ESMTP_LIMITS
2232 sx->peer_limit_mail = sx->peer_limit_rcpt = sx->peer_limit_rcptdom =
2234 sx->avoid_option = sx->peer_offered = smtp_peer_options = 0;
2236 #ifndef DISABLE_PIPE_CONNECT
2237 if ( verify_check_given_host(CUSS &ob->hosts_pipe_connect,
2238 sx->conn_args.host) == OK)
2240 /* We don't find out the local ip address until the connect, so if
2241 the helo string might use it avoid doing early-pipelining. */
2244 || !Ustrstr(sx->helo_data, "$sending_ip_address")
2245 || Ustrstr(sx->helo_data, "def:sending_ip_address")
2248 sx->early_pipe_ok = TRUE;
2249 if ( read_ehlo_cache_entry(sx)
2250 && sx->ehlo_resp.cleartext_features & OPTION_EARLY_PIPE)
2253 debug_printf("Using cached cleartext PIPECONNECT\n");
2254 sx->early_pipe_active = TRUE;
2255 sx->peer_offered = sx->ehlo_resp.cleartext_features;
2258 else DEBUG(D_transport)
2259 debug_printf("helo needs $sending_ip_address\n");
2262 if (sx->early_pipe_active)
2263 sx->outblock.conn_args = &sx->conn_args;
2267 blob lazy_conn = {.data = NULL};
2268 /* For TLS-connect, a TFO lazy-connect is useful since the Client Hello
2269 can go on the TCP SYN. */
2271 if ((sx->cctx.sock = smtp_connect(&sx->conn_args,
2272 sx->smtps ? &lazy_conn : NULL)) < 0)
2274 set_errno_nohost(sx->addrlist,
2275 errno == ETIMEDOUT ? ERRNO_CONNECTTIMEOUT : errno,
2276 sx->verify ? US strerror(errno) : NULL,
2277 DEFER, FALSE, &sx->delivery_start);
2278 sx->send_quit = FALSE;
2282 (void) setsockopt(sx->cctx.sock, IPPROTO_TCP, TCP_QUICKACK, US &off,
2286 /* Expand the greeting message while waiting for the initial response. (Makes
2287 sense if helo_data contains ${lookup dnsdb ...} stuff). The expansion is
2288 delayed till here so that $sending_interface and $sending_port are set. */
2289 /*XXX early-pipe: they still will not be. Is there any way to find out what they
2290 will be? Somehow I doubt it. */
2293 if (!(sx->helo_data = expand_string(sx->helo_data)))
2295 log_write(0, LOG_MAIN|LOG_PANIC,
2296 "<%s>: failed to expand transport's helo_data value for callout: %s",
2297 sx->addrlist->address, expand_string_message);
2302 expand_string_message = NULL;
2303 if ((sx->helo_data = string_domain_utf8_to_alabel(sx->helo_data,
2304 &expand_string_message)),
2305 expand_string_message)
2307 log_write(0, LOG_MAIN|LOG_PANIC,
2308 "<%s>: failed to expand transport's helo_data value for callout: %s",
2309 sx->addrlist->address, expand_string_message);
2311 sx->helo_data = NULL;
2315 /* The first thing is to wait for an initial OK response. The dreaded "goto"
2316 is nevertheless a reasonably clean way of programming this kind of logic,
2317 where you want to escape on any error. */
2321 #ifndef DISABLE_PIPE_CONNECT
2322 if (sx->early_pipe_active)
2324 sx->pending_BANNER = TRUE; /* sync_responses() must eventually handle */
2325 sx->outblock.cmd_count = 1;
2330 if (!smtp_reap_banner(sx))
2331 goto RESPONSE_FAILED;
2334 #ifndef DISABLE_EVENT
2337 lookup_dnssec_authenticated = sx->conn_args.host->dnssec==DS_YES ? US"yes"
2338 : sx->conn_args.host->dnssec==DS_NO ? US"no" : NULL;
2339 s = event_raise(sx->conn_args.tblock->event_action, US"smtp:connect", sx->buffer, NULL);
2342 set_errno_nohost(sx->addrlist, ERRNO_EXPANDFAIL,
2343 string_sprintf("deferred by smtp:connect event expansion: %s", s),
2344 DEFER, FALSE, &sx->delivery_start);
2351 /* Now check if the helo_data expansion went well, and sign off cleanly if
2356 message = string_sprintf("failed to expand helo_data: %s",
2357 expand_string_message);
2358 set_errno_nohost(sx->addrlist, ERRNO_EXPANDFAIL, message, DEFER, FALSE, &sx->delivery_start);
2364 /** Debugging without sending a message
2365 sx->addrlist->transport_return = DEFER;
2369 /* Errors that occur after this point follow an SMTP command, which is
2370 left in big_buffer by smtp_write_command() for use in error messages. */
2372 smtp_command = big_buffer;
2374 /* Tell the remote who we are...
2376 February 1998: A convention has evolved that ESMTP-speaking MTAs include the
2377 string "ESMTP" in their greeting lines, so make Exim send EHLO if the
2378 greeting is of this form. The assumption was that the far end supports it
2379 properly... but experience shows that there are some that give 5xx responses,
2380 even though the banner includes "ESMTP" (there's a bloody-minded one that
2381 says "ESMTP not spoken here"). Cope with that case.
2383 September 2000: Time has passed, and it seems reasonable now to always send
2384 EHLO at the start. It is also convenient to make the change while installing
2387 July 2003: Joachim Wieland met a broken server that advertises "PIPELINING"
2388 but times out after sending MAIL FROM, RCPT TO and DATA all together. There
2389 would be no way to send out the mails, so there is now a host list
2390 "hosts_avoid_esmtp" that disables ESMTP for special hosts and solves the
2391 PIPELINING problem as well. Maybe it can also be useful to cure other
2392 problems with broken servers.
2394 Exim originally sent "Helo" at this point and ran for nearly a year that way.
2395 Then somebody tried it with a Microsoft mailer... It seems that all other
2396 mailers use upper case for some reason (the RFC is quite clear about case
2397 independence) so, for peace of mind, I gave in. */
2399 sx->esmtp = verify_check_given_host(CUSS &ob->hosts_avoid_esmtp, sx->conn_args.host) != OK;
2401 /* Alas; be careful, since this goto is not an error-out, so conceivably
2402 we might set data between here and the target which we assume to exist
2403 and be usable. I can see this coming back to bite us. */
2407 smtp_peer_options |= OPTION_TLS;
2408 suppress_tls = FALSE;
2409 ob->tls_tempfail_tryclear = FALSE;
2410 smtp_command = US"SSL-on-connect";
2417 if (smtp_write_command(sx,
2418 #ifndef DISABLE_PIPE_CONNECT
2419 sx->early_pipe_active ? SCMD_BUFFER :
2422 "%s %s\r\n", sx->lmtp ? "LHLO" : "EHLO", sx->helo_data) < 0)
2424 sx->esmtp_sent = TRUE;
2426 #ifndef DISABLE_PIPE_CONNECT
2427 if (sx->early_pipe_active)
2429 sx->pending_EHLO = TRUE;
2431 /* If we have too many authenticators to handle and might need to AUTH
2432 for this transport, pipeline no further as we will need the
2433 list of auth methods offered. Reap the banner and EHLO. */
2435 if ( (ob->hosts_require_auth || ob->hosts_try_auth)
2436 && f.smtp_in_early_pipe_no_auth)
2438 DEBUG(D_transport) debug_printf("may need to auth, so pipeline no further\n");
2439 if (smtp_write_command(sx, SCMD_FLUSH, NULL) < 0)
2441 if (sync_responses(sx, 2, 0) != 0)
2444 debug_printf("failed reaping pipelined cmd responses\n");
2445 goto RESPONSE_FAILED;
2447 sx->early_pipe_active = FALSE;
2452 if (!smtp_reap_ehlo(sx))
2453 goto RESPONSE_FAILED;
2457 debug_printf("not sending EHLO (host matches hosts_avoid_esmtp)\n");
2459 #ifndef DISABLE_PIPE_CONNECT
2460 if (!sx->early_pipe_active)
2465 int n = sizeof(sx->buffer);
2466 uschar * rsp = sx->buffer;
2468 if (sx->esmtp_sent && (n = Ustrlen(sx->buffer) + 1) < sizeof(sx->buffer)/2)
2469 { rsp = sx->buffer + n; n = sizeof(sx->buffer) - n; }
2471 if (smtp_write_command(sx, SCMD_FLUSH, "HELO %s\r\n", sx->helo_data) < 0)
2473 good_response = smtp_read_response(sx, rsp, n, '2', ob->command_timeout);
2474 #ifdef EXPERIMENTAL_DSN_INFO
2475 sx->helo_response = string_copy(rsp);
2479 /* Handle special logging for a closed connection after HELO
2480 when had previously sent EHLO */
2482 if (rsp != sx->buffer && rsp[0] == 0 && (errno == 0 || errno == ECONNRESET))
2484 errno = ERRNO_SMTPCLOSED;
2485 goto EHLOHELO_FAILED;
2487 memmove(sx->buffer, rsp, Ustrlen(rsp));
2488 goto RESPONSE_FAILED;
2492 if (sx->esmtp || sx->lmtp)
2494 #ifndef DISABLE_PIPE_CONNECT
2495 if (!sx->early_pipe_active)
2498 sx->peer_offered = ehlo_response(sx->buffer,
2499 OPTION_TLS /* others checked later */
2500 #ifndef DISABLE_PIPE_CONNECT
2501 | (sx->early_pipe_ok
2503 | OPTION_CHUNKING | OPTION_PRDR | OPTION_DSN | OPTION_PIPE | OPTION_SIZE
2512 #ifdef EXPERIMENTAL_ESMTP_LIMITS
2513 if (tls_out.active.sock >= 0 || !(sx->peer_offered & OPTION_TLS))
2515 ehlo_response_limits_read(sx);
2516 ehlo_response_limits_apply(sx);
2519 #ifndef DISABLE_PIPE_CONNECT
2520 if (sx->early_pipe_ok)
2522 sx->ehlo_resp.cleartext_features = sx->peer_offered;
2524 if ( (sx->peer_offered & (OPTION_PIPE | OPTION_EARLY_PIPE))
2525 == (OPTION_PIPE | OPTION_EARLY_PIPE))
2527 DEBUG(D_transport) debug_printf("PIPE_CONNECT usable in future for this IP\n");
2528 sx->ehlo_resp.cleartext_auths = study_ehlo_auths(sx);
2529 write_ehlo_cache_entry(sx);
2535 /* Set tls_offered if the response to EHLO specifies support for STARTTLS. */
2538 smtp_peer_options |= sx->peer_offered & OPTION_TLS;
2543 /* For continuing deliveries down the same channel, having re-exec'd the socket
2544 is the standard input; for a socket held open from verify it is recorded
2545 in the cutthrough context block. Either way we don't need to redo EHLO here
2546 (but may need to do so for TLS - see below).
2547 Set up the pointer to where subsequent commands will be left, for
2548 error messages. Note that smtp_peer_options will have been
2549 set from the command line if they were set in the process that passed the
2552 /*XXX continue case needs to propagate DSN_INFO, prob. in deliver.c
2553 as the continue goes via transport_pass_socket() and doublefork and exec.
2554 It does not wait. Unclear how we keep separate host's responses
2555 separate - we could match up by host ip+port as a bodge. */
2559 if (cutthrough.cctx.sock >= 0 && cutthrough.callout_hold_only)
2561 sx->cctx = cutthrough.cctx;
2562 sx->conn_args.host->port = sx->port = cutthrough.host.port;
2566 sx->cctx.sock = 0; /* stdin */
2567 sx->cctx.tls_ctx = NULL;
2568 smtp_port_for_connect(sx->conn_args.host, sx->port); /* Record the port that was used */
2570 sx->inblock.cctx = sx->outblock.cctx = &sx->cctx;
2571 smtp_command = big_buffer;
2572 sx->peer_offered = smtp_peer_options;
2573 #ifdef EXPERIMENTAL_ESMTP_LIMITS
2574 /* Limits passed by cmdline over exec. */
2575 ehlo_limits_apply(sx,
2576 sx->peer_limit_mail = continue_limit_mail,
2577 sx->peer_limit_rcpt = continue_limit_rcpt,
2578 sx->peer_limit_rcptdom = continue_limit_rcptdom);
2580 sx->helo_data = NULL; /* ensure we re-expand ob->helo_data */
2582 /* For a continued connection with TLS being proxied for us, or a
2583 held-open verify connection with TLS, nothing more to do. */
2585 if ( continue_proxy_cipher
2586 || (cutthrough.cctx.sock >= 0 && cutthrough.callout_hold_only
2587 && cutthrough.is_tls)
2590 sx->pipelining_used = pipelining_active = !!(smtp_peer_options & OPTION_PIPE);
2591 HDEBUG(D_transport) debug_printf("continued connection, %s TLS\n",
2592 continue_proxy_cipher ? "proxied" : "verify conn with");
2595 HDEBUG(D_transport) debug_printf("continued connection, no TLS\n");
2598 /* If TLS is available on this connection, whether continued or not, attempt to
2599 start up a TLS session, unless the host is in hosts_avoid_tls. If successful,
2600 send another EHLO - the server may give a different answer in secure mode. We
2601 use a separate buffer for reading the response to STARTTLS so that if it is
2602 negative, the original EHLO data is available for subsequent analysis, should
2603 the client not be required to use TLS. If the response is bad, copy the buffer
2604 for error analysis. */
2607 if ( smtp_peer_options & OPTION_TLS
2609 && verify_check_given_host(CUSS &ob->hosts_avoid_tls, sx->conn_args.host) != OK
2611 || verify_check_given_host(CUSS &ob->hosts_verify_avoid_tls, sx->conn_args.host) != OK
2614 uschar buffer2[4096];
2616 if (smtp_write_command(sx, SCMD_FLUSH, "STARTTLS\r\n") < 0)
2619 #ifndef DISABLE_PIPE_CONNECT
2620 /* If doing early-pipelining reap the banner and EHLO-response but leave
2621 the response for the STARTTLS we just sent alone. On fail, assume wrong
2622 cached capability and retry with the pipelining disabled. */
2624 if (sx->early_pipe_active && sync_responses(sx, 2, 0) != 0)
2627 debug_printf("failed reaping pipelined cmd responses\n");
2628 close(sx->cctx.sock);
2630 sx->early_pipe_active = FALSE;
2631 goto PIPE_CONNECT_RETRY;
2635 /* If there is an I/O error, transmission of this message is deferred. If
2636 there is a temporary rejection of STARRTLS and tls_tempfail_tryclear is
2637 false, we also defer. However, if there is a temporary rejection of STARTTLS
2638 and tls_tempfail_tryclear is true, or if there is an outright rejection of
2639 STARTTLS, we carry on. This means we will try to send the message in clear,
2640 unless the host is in hosts_require_tls (tested below). */
2642 if (!smtp_read_response(sx, buffer2, sizeof(buffer2), '2', ob->command_timeout))
2646 || (buffer2[0] == '4' && !ob->tls_tempfail_tryclear)
2649 Ustrncpy(sx->buffer, buffer2, sizeof(sx->buffer));
2650 sx->buffer[sizeof(sx->buffer)-1] = '\0';
2651 goto RESPONSE_FAILED;
2655 /* STARTTLS accepted: try to negotiate a TLS session. */
2660 if (!tls_client_start(&sx->cctx, &sx->conn_args, sx->addrlist, &tls_out, &tls_errstr))
2662 /* TLS negotiation failed; give an error. From outside, this function may
2663 be called again to try in clear on a new connection, if the options permit
2664 it for this host. */
2666 DEBUG(D_tls) debug_printf("TLS session fail: %s\n", tls_errstr);
2668 # ifdef SUPPORT_DANE
2669 if (sx->conn_args.dane)
2671 log_write(0, LOG_MAIN,
2672 "DANE attempt failed; TLS connection to %s [%s]: %s",
2673 sx->conn_args.host->name, sx->conn_args.host->address, tls_errstr);
2674 # ifndef DISABLE_EVENT
2675 (void) event_raise(sx->conn_args.tblock->event_action,
2676 US"dane:fail", US"validation-failure", NULL); /* could do with better detail */
2681 errno = ERRNO_TLSFAILURE;
2682 message = string_sprintf("TLS session: %s", tls_errstr);
2683 sx->send_quit = FALSE;
2686 sx->send_tlsclose = TRUE;
2688 /* TLS session is set up. Check the inblock fill level. If there is
2689 content then as we have not yet done a tls read it must have arrived before
2690 the TLS handshake, in-clear. That violates the sync requirement of the
2691 STARTTLS RFC, so fail. */
2693 if (sx->inblock.ptr != sx->inblock.ptrend)
2697 int i = sx->inblock.ptrend - sx->inblock.ptr;
2698 debug_printf("unused data in input buffer after ack for STARTTLS:\n"
2700 i > 100 ? 100 : i, sx->inblock.ptr, i > 100 ? "..." : "");
2702 tls_errstr = US"synch error before connect";
2703 goto TLS_CONN_FAILED;
2706 smtp_peer_options_wrap = smtp_peer_options;
2707 for (address_item * addr = sx->addrlist; addr; addr = addr->next)
2708 if (addr->transport_return == PENDING_DEFER)
2710 addr->cipher = tls_out.cipher;
2711 addr->ourcert = tls_out.ourcert;
2712 addr->peercert = tls_out.peercert;
2713 addr->peerdn = tls_out.peerdn;
2714 addr->ocsp = tls_out.ocsp;
2715 addr->tlsver = tls_out.ver;
2720 /* if smtps, we'll have smtp_command set to something else; always safe to
2722 smtp_command = big_buffer;
2724 /* If we started TLS, redo the EHLO/LHLO exchange over the secure channel. If
2725 helo_data is null, we are dealing with a connection that was passed from
2726 another process, and so we won't have expanded helo_data above. We have to
2727 expand it here. $sending_ip_address and $sending_port are set up right at the
2728 start of the Exim process (in exim.c). */
2730 if (tls_out.active.sock >= 0)
2732 uschar * greeting_cmd;
2734 if (!sx->helo_data && !(sx->helo_data = expand_string(ob->helo_data)))
2736 uschar *message = string_sprintf("failed to expand helo_data: %s",
2737 expand_string_message);
2738 set_errno_nohost(sx->addrlist, ERRNO_EXPANDFAIL, message, DEFER, FALSE, &sx->delivery_start);
2743 #ifndef DISABLE_PIPE_CONNECT
2744 /* For SMTPS there is no cleartext early-pipe; use the crypted permission bit.
2745 We're unlikely to get the group sent and delivered before the server sends its
2746 banner, but it's still worth sending as a group.
2747 For STARTTLS allow for cleartext early-pipe but no crypted early-pipe, but not
2750 if (sx->smtps ? sx->early_pipe_ok : sx->early_pipe_active)
2752 sx->peer_offered = sx->ehlo_resp.crypted_features;
2753 if ((sx->early_pipe_active =
2754 !!(sx->ehlo_resp.crypted_features & OPTION_EARLY_PIPE)))
2755 DEBUG(D_transport) debug_printf("Using cached crypted PIPECONNECT\n");
2758 #ifdef EXPERIMMENTAL_ESMTP_LIMITS
2759 /* As we are about to send another EHLO, forget any LIMITS received so far. */
2760 sx->peer_limit_mail = sx->peer_limit_rcpt = sx->peer_limit_rcptdom = 0;
2761 if ((sx->max_mail = sx->conn_args.tblock->connection_max_message) == 0) sx->max_mail = 999999;
2762 if ((sx->max_rcpt = sx->conn_args.tblock->max_addresses) == 0) sx->max_rcpt = 999999;
2763 sx->single_rcpt_domain = FALSE;
2766 /* For SMTPS we need to wait for the initial OK response. */
2768 #ifndef DISABLE_PIPE_CONNECT
2769 if (sx->early_pipe_active)
2771 sx->pending_BANNER = TRUE;
2772 sx->outblock.cmd_count = 1;
2776 if (!smtp_reap_banner(sx))
2777 goto RESPONSE_FAILED;
2780 greeting_cmd = US"LHLO";
2782 greeting_cmd = US"EHLO";
2785 greeting_cmd = US"HELO";
2787 debug_printf("not sending EHLO (host matches hosts_avoid_esmtp)\n");
2790 if (smtp_write_command(sx,
2791 #ifndef DISABLE_PIPE_CONNECT
2792 sx->early_pipe_active ? SCMD_BUFFER :
2795 "%s %s\r\n", greeting_cmd, sx->helo_data) < 0)
2798 #ifndef DISABLE_PIPE_CONNECT
2799 if (sx->early_pipe_active)
2800 sx->pending_EHLO = TRUE;
2804 if (!smtp_reap_ehlo(sx))
2807 /* The GnuTLS layer in Exim only spots a server-rejection of a client
2808 cert late, under TLS1.3 - which means here; the first time we try to
2809 receive crypted data. Treat it as if it was a connect-time failure.
2810 See also the early-pipe equivalent... which will be hard; every call
2811 to sync_responses will need to check the result.
2812 It would be nicer to have GnuTLS check the cert during the handshake.
2813 Can it do that, with all the flexibility we need? */
2815 tls_errstr = US"error on first read";
2816 goto TLS_CONN_FAILED;
2819 goto RESPONSE_FAILED;
2821 smtp_peer_options = 0;
2825 /* If the host is required to use a secure channel, ensure that we
2829 # ifdef SUPPORT_DANE
2830 || sx->conn_args.dane
2832 || verify_check_given_host(CUSS &ob->hosts_require_tls, sx->conn_args.host) == OK
2835 errno = ERRNO_TLSREQUIRED;
2836 message = string_sprintf("a TLS session is required, but %s",
2837 smtp_peer_options & OPTION_TLS
2838 ? "an attempt to start TLS failed" : "the server did not offer TLS support");
2839 # if defined(SUPPORT_DANE) && !defined(DISABLE_EVENT)
2840 if (sx->conn_args.dane)
2841 (void) event_raise(sx->conn_args.tblock->event_action, US"dane:fail",
2842 smtp_peer_options & OPTION_TLS
2843 ? US"validation-failure" /* could do with better detail */
2844 : US"starttls-not-supported",
2849 #endif /*DISABLE_TLS*/
2851 /* If TLS is active, we have just started it up and re-done the EHLO command,
2852 so its response needs to be analyzed. If TLS is not active and this is a
2853 continued session down a previously-used socket, we haven't just done EHLO, so
2856 if ( !continue_hostname
2858 || tls_out.active.sock >= 0
2862 if (sx->esmtp || sx->lmtp)
2864 #ifndef DISABLE_PIPE_CONNECT
2865 if (!sx->early_pipe_active)
2868 sx->peer_offered = ehlo_response(sx->buffer,
2870 #ifndef DISABLE_PIPE_CONNECT
2871 | (sx->lmtp && ob->lmtp_ignore_quota ? OPTION_IGNQ : 0)
2872 | OPTION_DSN | OPTION_PIPE | OPTION_SIZE
2873 | OPTION_CHUNKING | OPTION_PRDR | OPTION_UTF8
2874 | (tls_out.active.sock >= 0 ? OPTION_EARLY_PIPE : 0) /* not for lmtp */
2878 | (sx->lmtp && ob->lmtp_ignore_quota ? OPTION_IGNQ : 0)
2881 # ifdef SUPPORT_I18N
2882 | (sx->addrlist->prop.utf8_msg ? OPTION_UTF8 : 0)
2883 /*XXX if we hand peercaps on to continued-conn processes,
2884 must not depend on this addr */
2888 | (ob->size_addition >= 0 ? OPTION_SIZE : 0)
2891 #ifndef DISABLE_PIPE_CONNECT
2892 if (tls_out.active.sock >= 0)
2893 sx->ehlo_resp.crypted_features = sx->peer_offered;
2896 #ifdef EXPERIMENTAL_ESMTP_LIMITS
2897 if (tls_out.active.sock >= 0 || !(sx->peer_offered & OPTION_TLS))
2899 ehlo_response_limits_read(sx);
2900 ehlo_response_limits_apply(sx);
2905 /* Set for IGNOREQUOTA if the response to LHLO specifies support and the
2906 lmtp_ignore_quota option was set. */
2908 sx->igquotstr = sx->peer_offered & OPTION_IGNQ ? US" IGNOREQUOTA" : US"";
2910 /* If the response to EHLO specified support for the SIZE parameter, note
2911 this, provided size_addition is non-negative. */
2913 smtp_peer_options |= sx->peer_offered & OPTION_SIZE;
2915 /* Note whether the server supports PIPELINING. If hosts_avoid_esmtp matched
2916 the current host, esmtp will be false, so PIPELINING can never be used. If
2917 the current host matches hosts_avoid_pipelining, don't do it. */
2919 if ( sx->peer_offered & OPTION_PIPE
2920 && verify_check_given_host(CUSS &ob->hosts_avoid_pipelining, sx->conn_args.host) != OK)
2921 smtp_peer_options |= OPTION_PIPE;
2923 DEBUG(D_transport) debug_printf("%susing PIPELINING\n",
2924 smtp_peer_options & OPTION_PIPE ? "" : "not ");
2926 if ( sx->peer_offered & OPTION_CHUNKING
2927 && verify_check_given_host(CUSS &ob->hosts_try_chunking, sx->conn_args.host) != OK)
2928 sx->peer_offered &= ~OPTION_CHUNKING;
2930 if (sx->peer_offered & OPTION_CHUNKING)
2931 DEBUG(D_transport) debug_printf("CHUNKING usable\n");
2933 #ifndef DISABLE_PRDR
2934 if ( sx->peer_offered & OPTION_PRDR
2935 && verify_check_given_host(CUSS &ob->hosts_try_prdr, sx->conn_args.host) != OK)
2936 sx->peer_offered &= ~OPTION_PRDR;
2938 if (sx->peer_offered & OPTION_PRDR)
2939 DEBUG(D_transport) debug_printf("PRDR usable\n");
2942 /* Note if the server supports DSN */
2943 smtp_peer_options |= sx->peer_offered & OPTION_DSN;
2944 DEBUG(D_transport) debug_printf("%susing DSN\n",
2945 sx->peer_offered & OPTION_DSN ? "" : "not ");
2947 #ifndef DISABLE_PIPE_CONNECT
2948 if ( sx->early_pipe_ok
2949 && !sx->early_pipe_active
2950 && tls_out.active.sock >= 0
2951 && smtp_peer_options & OPTION_PIPE
2952 && ( sx->ehlo_resp.cleartext_features | sx->ehlo_resp.crypted_features)
2953 & OPTION_EARLY_PIPE)
2955 DEBUG(D_transport) debug_printf("PIPECONNECT usable in future for this IP\n");
2956 sx->ehlo_resp.crypted_auths = study_ehlo_auths(sx);
2957 write_ehlo_cache_entry(sx);
2961 /* Note if the response to EHLO specifies support for the AUTH extension.
2962 If it has, check that this host is one we want to authenticate to, and do
2963 the business. The host name and address must be available when the
2964 authenticator's client driver is running. */
2966 switch (yield = smtp_auth(sx))
2968 default: goto SEND_QUIT;
2970 case FAIL_SEND: goto SEND_FAILED;
2971 case FAIL: goto RESPONSE_FAILED;
2975 sx->pipelining_used = pipelining_active = !!(smtp_peer_options & OPTION_PIPE);
2977 /* The setting up of the SMTP call is now complete. Any subsequent errors are
2978 message-specific. */
2980 sx->setting_up = FALSE;
2983 if (sx->addrlist->prop.utf8_msg)
2987 /* If the transport sets a downconversion mode it overrides any set by ACL
2990 if ((s = ob->utf8_downconvert))
2992 if (!(s = expand_string(s)))
2994 message = string_sprintf("failed to expand utf8_downconvert: %s",
2995 expand_string_message);
2996 set_errno_nohost(sx->addrlist, ERRNO_EXPANDFAIL, message, DEFER, FALSE, &sx->delivery_start);
3002 case '1': sx->addrlist->prop.utf8_downcvt = TRUE;
3003 sx->addrlist->prop.utf8_downcvt_maybe = FALSE;
3005 case '0': sx->addrlist->prop.utf8_downcvt = FALSE;
3006 sx->addrlist->prop.utf8_downcvt_maybe = FALSE;
3008 case '-': if (s[1] == '1')
3010 sx->addrlist->prop.utf8_downcvt = FALSE;
3011 sx->addrlist->prop.utf8_downcvt_maybe = TRUE;
3017 sx->utf8_needed = !sx->addrlist->prop.utf8_downcvt
3018 && !sx->addrlist->prop.utf8_downcvt_maybe;
3019 DEBUG(D_transport) if (!sx->utf8_needed)
3020 debug_printf("utf8: %s downconvert\n",
3021 sx->addrlist->prop.utf8_downcvt ? "mandatory" : "optional");
3024 /* If this is an international message we need the host to speak SMTPUTF8 */
3025 if (sx->utf8_needed && !(sx->peer_offered & OPTION_UTF8))
3027 errno = ERRNO_UTF8_FWD;
3028 goto RESPONSE_FAILED;
3030 #endif /*SUPPORT_I18N*/
3039 if (errno == ECONNREFUSED) /* first-read error on a TFO conn */
3041 /* There is a testing facility for simulating a connection timeout, as I
3042 can't think of any other way of doing this. It converts a connection
3043 refused into a timeout if the timeout is set to 999999. This is done for
3044 a 3whs connection in ip_connect(), but a TFO connection does not error
3045 there - instead it gets ECONNREFUSED on the first data read. Tracking
3046 that a TFO really was done is too hard, or we would set a
3047 sx->pending_conn_done bit and test that in smtp_reap_banner() and
3048 smtp_reap_ehlo(). That would let us also add the conn-timeout to the
3051 if (f.running_in_test_harness && ob->connect_timeout == 999999)
3053 set_errno_nohost(sx->addrlist,
3054 errno == ETIMEDOUT ? ERRNO_CONNECTTIMEOUT : errno,
3055 sx->verify ? US strerror(errno) : NULL,
3056 DEFER, FALSE, &sx->delivery_start);
3057 sx->send_quit = FALSE;
3061 /* really an error on an SMTP read */
3063 sx->send_quit = check_response(sx->conn_args.host, &errno, sx->addrlist->more_errno,
3064 sx->buffer, &code, &message, &pass_message);
3070 message = US string_sprintf("smtp send to %s [%s] failed: %s",
3071 sx->conn_args.host->name, sx->conn_args.host->address, strerror(errno));
3072 sx->send_quit = FALSE;
3078 message = string_sprintf("Remote host closed connection in response to %s"
3079 " (EHLO response was: %s)", smtp_command, sx->buffer);
3080 sx->send_quit = FALSE;
3084 /* This label is jumped to directly when a TLS negotiation has failed,
3085 or was not done for a host for which it is required. Values will be set
3086 in message and errno, and setting_up will always be true. Treat as
3087 a temporary error. */
3091 code = '4', yield = DEFER;
3095 /* The failure happened while setting up the call; see if the failure was
3096 a 5xx response (this will either be on connection, or following HELO - a 5xx
3097 after EHLO causes it to try HELO). If so, and there are no more hosts to try,
3098 fail all addresses, as this host is never going to accept them. For other
3099 errors during setting up (timeouts or whatever), defer all addresses, and
3100 yield DEFER, so that the host is not tried again for a while.
3102 XXX This peeking for another host feels like a layering violation. We want
3103 to note the host as unusable, but down here we shouldn't know if this was
3104 the last host to try for the addr(list). Perhaps the upper layer should be
3105 the one to do set_errno() ? The problem is that currently the addr is where
3106 errno etc. are stashed, but until we run out of hosts to try the errors are
3107 host-specific. Maybe we should enhance the host_item definition? */
3110 sx->ok = FALSE; /* For when reached by GOTO */
3111 set_errno(sx->addrlist, errno, message,
3112 sx->conn_args.host->next
3116 || errno == ERRNO_UTF8_FWD
3120 errno == ECONNREFUSED ? NULL : sx->conn_args.host,
3121 #ifdef EXPERIMENTAL_DSN_INFO
3122 sx->smtp_greeting, sx->helo_response,
3124 &sx->delivery_start);
3131 (void)smtp_write_command(sx, SCMD_FLUSH, "QUIT\r\n");
3134 if (sx->cctx.tls_ctx)
3136 if (sx->send_tlsclose)
3138 tls_close(sx->cctx.tls_ctx, TLS_SHUTDOWN_NOWAIT);
3139 sx->send_tlsclose = FALSE;
3141 sx->cctx.tls_ctx = NULL;
3145 /* Close the socket, and return the appropriate value, first setting
3146 works because the NULL setting is passed back to the calling process, and
3147 remote_max_parallel is forced to 1 when delivering over an existing connection,
3150 HDEBUG(D_transport|D_acl|D_v) debug_printf_indent(" SMTP(close)>>\n");
3153 shutdown(sx->cctx.sock, SHUT_WR);
3154 if (fcntl(sx->cctx.sock, F_SETFL, O_NONBLOCK) == 0)
3155 for (int i = 16; read(sx->cctx.sock, sx->inbuffer, sizeof(sx->inbuffer)) > 0 && i > 0;)
3156 i--; /* drain socket */
3157 sx->send_quit = FALSE;
3159 (void)close(sx->cctx.sock);
3162 #ifndef DISABLE_EVENT
3163 (void) event_raise(sx->conn_args.tblock->event_action, US"tcp:close", NULL, NULL);
3166 continue_transport = NULL;
3167 continue_hostname = NULL;
3174 /* Create the string of options that will be appended to the MAIL FROM:
3175 in the connection context buffer */
3178 build_mailcmd_options(smtp_context * sx, address_item * addrlist)
3180 uschar * p = sx->buffer;
3181 address_item * addr;
3186 /* If we know the receiving MTA supports the SIZE qualification, and we know it,
3187 send it, adding something to the message size to allow for imprecision
3188 and things that get added en route. Exim keeps the number of lines
3189 in a message, so we can give an accurate value for the original message, but we
3190 need some additional to handle added headers. (Double "." characters don't get
3191 included in the count.) */
3193 if ( message_size > 0
3194 && sx->peer_offered & OPTION_SIZE && !(sx->avoid_option & OPTION_SIZE))
3196 /*XXX problem here under spool_files_wireformat?
3197 Or just forget about lines? Or inflate by a fixed proportion? */
3199 sprintf(CS p, " SIZE=%d", message_size+message_linecount+(SOB sx->conn_args.ob)->size_addition);
3203 #ifndef DISABLE_PRDR
3204 /* If it supports Per-Recipient Data Responses, and we have more than one recipient,
3207 sx->prdr_active = FALSE;
3208 if (sx->peer_offered & OPTION_PRDR)
3209 for (address_item * addr = addrlist; addr; addr = addr->next)
3210 if (addr->transport_return == PENDING_DEFER)
3212 for (addr = addr->next; addr; addr = addr->next)
3213 if (addr->transport_return == PENDING_DEFER)
3214 { /* at least two recipients to send */
3215 sx->prdr_active = TRUE;
3216 sprintf(CS p, " PRDR"); p += 5;
3224 /* If it supports internationalised messages, and this meesage need that,
3227 if ( sx->peer_offered & OPTION_UTF8
3228 && addrlist->prop.utf8_msg
3229 && !addrlist->prop.utf8_downcvt
3231 Ustrcpy(p, US" SMTPUTF8"), p += 9;
3234 /* check if all addresses have DSN-lasthop flag; do not send RET and ENVID if so */
3235 for (sx->dsn_all_lasthop = TRUE, addr = addrlist, address_count = 0;
3236 addr && address_count < sx->max_rcpt; /*XXX maybe also || sx->single_rcpt_domain ? */
3237 addr = addr->next) if (addr->transport_return == PENDING_DEFER)
3240 if (!(addr->dsn_flags & rf_dsnlasthop))
3242 sx->dsn_all_lasthop = FALSE;
3247 /* Add any DSN flags to the mail command */
3249 if (sx->peer_offered & OPTION_DSN && !sx->dsn_all_lasthop)
3251 if (dsn_ret == dsn_ret_hdrs)
3252 { Ustrcpy(p, US" RET=HDRS"); p += 9; }
3253 else if (dsn_ret == dsn_ret_full)
3254 { Ustrcpy(p, US" RET=FULL"); p += 9; }
3258 string_format(p, sizeof(sx->buffer) - (p-sx->buffer), " ENVID=%s", dsn_envid);
3263 /* If an authenticated_sender override has been specified for this transport
3264 instance, expand it. If the expansion is forced to fail, and there was already
3265 an authenticated_sender for this message, the original value will be used.
3266 Other expansion failures are serious. An empty result is ignored, but there is
3267 otherwise no check - this feature is expected to be used with LMTP and other
3268 cases where non-standard addresses (e.g. without domains) might be required. */
3270 return smtp_mail_auth_str(sx, p, addrlist) ? ERROR : OK;
3275 build_rcptcmd_options(smtp_context * sx, const address_item * addr)
3277 uschar * p = sx->buffer;
3280 /* Add any DSN flags to the rcpt command */
3282 if (sx->peer_offered & OPTION_DSN && !(addr->dsn_flags & rf_dsnlasthop))
3284 if (addr->dsn_flags & rf_dsnflags)
3288 Ustrcpy(p, US" NOTIFY=");
3290 for (int i = 0; i < nelem(rf_list); i++) if (addr->dsn_flags & rf_list[i])
3292 if (!first) *p++ = ',';
3294 Ustrcpy(p, rf_names[i]);
3299 if (addr->dsn_orcpt)
3301 string_format(p, sizeof(sx->buffer) - (p-sx->buffer), " ORCPT=%s",
3312 0 good, rcpt results in addr->transport_return (PENDING_OK, DEFER, FAIL)
3313 -1 MAIL response error
3314 -2 any non-MAIL read i/o error
3315 -3 non-MAIL response timeout
3316 -4 internal error; channel still usable
3321 smtp_write_mail_and_rcpt_cmds(smtp_context * sx, int * yield)
3323 address_item * addr;
3324 #ifdef EXPERIMENTAL_ESMTP_LIMITS
3325 address_item * restart_addr = NULL;
3327 int address_count, pipe_limit;
3330 if (build_mailcmd_options(sx, sx->first_addr) != OK)
3336 /* From here until we send the DATA command, we can make use of PIPELINING
3337 if the server host supports it. The code has to be able to check the responses
3338 at any point, for when the buffer fills up, so we write it totally generally.
3339 When PIPELINING is off, each command written reports that it has flushed the
3342 sx->pending_MAIL = TRUE; /* The block starts with MAIL */
3345 uschar * s = sx->from_addr;
3347 uschar * errstr = NULL;
3349 /* If we must downconvert, do the from-address here. Remember we had to
3350 for the to-addresses (done below), and also (ugly) for re-doing when building
3351 the delivery log line. */
3353 if ( sx->addrlist->prop.utf8_msg
3354 && (sx->addrlist->prop.utf8_downcvt || !(sx->peer_offered & OPTION_UTF8))
3357 if (s = string_address_utf8_to_alabel(s, &errstr), errstr)
3359 set_errno_nohost(sx->addrlist, ERRNO_EXPANDFAIL, errstr, DEFER, FALSE, &sx->delivery_start);
3363 setflag(sx->addrlist, af_utf8_downcvt);
3367 rc = smtp_write_command(sx, pipelining_active ? SCMD_BUFFER : SCMD_FLUSH,
3368 "MAIL FROM:<%s>%s\r\n", s, sx->buffer);
3371 mail_command = string_copy(big_buffer); /* Save for later error message */
3375 case -1: /* Transmission error */
3378 case +1: /* Cmd was sent */
3379 if (!smtp_read_response(sx, sx->buffer, sizeof(sx->buffer), '2',
3380 (SOB sx->conn_args.ob)->command_timeout))
3382 if (errno == 0 && sx->buffer[0] == '4')
3384 errno = ERRNO_MAIL4XX;
3385 sx->addrlist->more_errno |= ((sx->buffer[1] - '0')*10 + sx->buffer[2] - '0') << 8;
3389 sx->pending_MAIL = FALSE;
3392 /* otherwise zero: command queued for pipeline */
3395 /* Pass over all the relevant recipient addresses for this host, which are the
3396 ones that have status PENDING_DEFER. If we are using PIPELINING, we can send
3397 several before we have to read the responses for those seen so far. This
3398 checking is done by a subroutine because it also needs to be done at the end.
3399 Send only up to max_rcpt addresses at a time, leaving next_addr pointing to
3400 the next one if not all are sent.
3402 In the MUA wrapper situation, we want to flush the PIPELINING buffer for the
3403 last address because we want to abort if any recipients have any kind of
3404 problem, temporary or permanent. We know that all recipient addresses will have
3405 the PENDING_DEFER status, because only one attempt is ever made, and we know
3406 that max_rcpt will be large, so all addresses will be done at once.
3408 For verify we flush the pipeline after any (the only) rcpt address. */
3410 for (addr = sx->first_addr, address_count = 0, pipe_limit = 100;
3411 addr && address_count < sx->max_rcpt;
3412 addr = addr->next) if (addr->transport_return == PENDING_DEFER)
3418 #ifdef EXPERIMENTAL_ESMTP_LIMITS
3419 if ( sx->single_rcpt_domain /* restriction on domains */
3420 && address_count > 0 /* not first being sent */
3421 && Ustrcmp(addr->domain, sx->first_addr->domain) != 0 /* dom diff from first */
3424 DEBUG(D_transport) debug_printf("skipping different domain %s\n", addr->domain);
3426 /* Ensure the smtp-response reaper does not think the address had a RCPT
3427 command sent for it. Reset to PENDING_DEFER in smtp_deliver(), where we
3428 goto SEND_MESSAGE. */
3430 addr->transport_return = SKIP;
3431 if (!restart_addr) restart_addr = addr; /* note restart point */
3432 continue; /* skip this one */
3436 addr->dsn_aware = sx->peer_offered & OPTION_DSN
3437 ? dsn_support_yes : dsn_support_no;
3440 if (pipe_limit-- <= 0)
3441 { no_flush = FALSE; pipe_limit = 100; }
3443 no_flush = pipelining_active && !sx->verify
3444 && (!mua_wrapper || addr->next && address_count < sx->max_rcpt);
3446 build_rcptcmd_options(sx, addr);
3448 /* Now send the RCPT command, and process outstanding responses when
3449 necessary. After a timeout on RCPT, we just end the function, leaving the
3450 yield as OK, because this error can often mean that there is a problem with
3451 just one address, so we don't want to delay the host. */
3453 rcpt_addr = transport_rcpt_address(addr, sx->conn_args.tblock->rcpt_include_affixes);
3456 if ( testflag(sx->addrlist, af_utf8_downcvt)
3457 && !(rcpt_addr = string_address_utf8_to_alabel(rcpt_addr, NULL))
3460 /*XXX could we use a per-address errstr here? Not fail the whole send? */
3461 errno = ERRNO_EXPANDFAIL;
3462 return -5; /*XXX too harsh? */
3466 cmds_sent = smtp_write_command(sx, no_flush ? SCMD_BUFFER : SCMD_FLUSH,
3467 "RCPT TO:<%s>%s%s\r\n", rcpt_addr, sx->igquotstr, sx->buffer);
3469 if (cmds_sent < 0) return -5;
3472 switch(sync_responses(sx, cmds_sent, 0))
3474 case 3: sx->ok = TRUE; /* 2xx & 5xx => OK & progress made */
3475 case 2: sx->completed_addr = TRUE; /* 5xx (only) => progress made */
3478 case 1: sx->ok = TRUE; /* 2xx (only) => OK, but if LMTP, */
3479 if (!sx->lmtp) /* can't tell about progress yet */
3480 sx->completed_addr = TRUE;
3481 case 0: /* No 2xx or 5xx, but no probs */
3482 /* If any RCPT got a 452 response then next_addr has been updated
3483 for restarting with a new MAIL on the same connection. Send no more
3484 RCPTs for this MAIL. */
3488 DEBUG(D_transport) debug_printf("seen 452 too-many-rcpts\n");
3489 sx->RCPT_452 = FALSE;
3490 /* sx->next_addr has been reset for fast_retry */
3495 case -1: return -3; /* Timeout on RCPT */
3496 case -2: return -2; /* non-MAIL read i/o error */
3497 default: return -1; /* any MAIL error */
3499 #ifndef DISABLE_PIPE_CONNECT
3500 case -4: return -1; /* non-2xx for pipelined banner or EHLO */
3501 case -5: return -1; /* TLS first-read error */
3505 } /* Loop for next address */
3507 #ifdef EXPERIMENTAL_ESMTP_LIMITS
3508 sx->next_addr = restart_addr ? restart_addr : addr;
3510 sx->next_addr = addr;
3517 /*****************************************************
3518 * Proxy TLS connection for another transport process *
3519 ******************************************************/
3521 Close the unused end of the pipe, fork once more, then use the given buffer
3522 as a staging area, and select on both the given fd and the TLS'd client-fd for
3523 data to read (per the coding in ip_recv() and fd_ready() this is legitimate).
3524 Do blocking full-size writes, and reads under a timeout. Once both input
3525 channels are closed, exit the process.
3529 buf space to use for buffering
3530 bufsiz size of buffer
3531 pfd pipe filedescriptor array; [0] is comms to proxied process
3532 timeout per-read timeout, seconds
3538 smtp_proxy_tls(void * ct_ctx, uschar * buf, size_t bsize, int * pfd,
3541 struct pollfd p[2] = {{.fd = tls_out.active.sock, .events = POLLIN},
3542 {.fd = pfd[0], .events = POLLIN}};
3544 BOOL send_tls_shutdown = TRUE;
3547 if ((rc = exim_fork(US"tls-proxy")))
3548 _exit(rc < 0 ? EXIT_FAILURE : EXIT_SUCCESS);
3550 set_process_info("proxying TLS connection for continued transport");
3554 time_t time_left = timeout;
3555 time_t time_start = time(NULL);
3560 rc = poll(p, 2, time_left * 1000);
3562 if (rc < 0 && errno == EINTR)
3563 if ((time_left -= time(NULL) - time_start) > 0) continue;
3567 DEBUG(D_transport) if (rc == 0) debug_printf("%s: timed out\n", __FUNCTION__);
3571 /* For errors where not readable, bomb out */
3573 if (p[0].revents & POLLERR || p[1].revents & POLLERR)
3575 DEBUG(D_transport) debug_printf("select: exceptional cond on %s fd\n",
3576 p[0].revents & POLLERR ? "tls" : "proxy");
3577 if (!(p[0].revents & POLLIN || p[1].events & POLLIN))
3579 DEBUG(D_transport) debug_printf("- but also readable; no exit yet\n");
3582 while (rc < 0 || !(p[0].revents & POLLIN || p[1].revents & POLLIN));
3584 /* handle inbound data */
3585 if (p[0].revents & POLLIN)
3586 if ((rc = tls_read(ct_ctx, buf, bsize)) <= 0) /* Expect -1 for EOF; */
3587 { /* that reaps the TLS Close Notify record */
3589 shutdown(pfd[0], SHUT_WR);
3593 for (int nbytes = 0; rc - nbytes > 0; nbytes += i)
3594 if ((i = write(pfd[0], buf + nbytes, rc - nbytes)) < 0) goto done;
3596 /* Handle outbound data. We cannot combine payload and the TLS-close
3597 due to the limitations of the (pipe) channel feeding us. Maybe use a unix-domain
3599 if (p[1].revents & POLLIN)
3600 if ((rc = read(pfd[0], buf, bsize)) <= 0)
3604 # ifdef EXIM_TCP_CORK /* Use _CORK to get TLS Close Notify in FIN segment */
3605 (void) setsockopt(tls_out.active.sock, IPPROTO_TCP, EXIM_TCP_CORK, US &on, sizeof(on));
3607 tls_shutdown_wr(ct_ctx);
3608 send_tls_shutdown = FALSE;
3609 shutdown(tls_out.active.sock, SHUT_WR);
3612 for (int nbytes = 0; rc - nbytes > 0; nbytes += i)
3613 if ((i = tls_write(ct_ctx, buf + nbytes, rc - nbytes, FALSE)) < 0)
3616 while (p[0].fd >= 0 || p[1].fd >= 0);
3619 if (send_tls_shutdown) tls_close(ct_ctx, TLS_SHUTDOWN_NOWAIT);
3621 testharness_pause_ms(100); /* let logging complete */
3622 exim_exit(EXIT_SUCCESS);
3627 /*************************************************
3628 * Deliver address list to given host *
3629 *************************************************/
3631 /* If continue_hostname is not null, we get here only when continuing to
3632 deliver down an existing channel. The channel was passed as the standard
3633 input. TLS is never active on a passed channel; the previous process either
3634 closes it down before passing the connection on, or inserts a TLS-proxy
3635 process and passes on a cleartext conection.
3637 Otherwise, we have to make a connection to the remote host, and do the
3638 initial protocol exchange.
3640 When running as an MUA wrapper, if the sender or any recipient is rejected,
3641 temporarily or permanently, we force failure for all recipients.
3644 addrlist chain of potential addresses to deliver; only those whose
3645 transport_return field is set to PENDING_DEFER are currently
3646 being processed; others should be skipped - they have either
3647 been delivered to an earlier host or IP address, or been
3648 failed by one of them.
3649 host host to deliver to
3650 host_af AF_INET or AF_INET6
3651 defport default TCP/IP port to use if host does not specify, in host
3653 interface interface to bind to, or NULL
3654 tblock transport instance block
3655 message_defer set TRUE if yield is OK, but all addresses were deferred
3656 because of a non-recipient, non-host failure, that is, a
3657 4xx response to MAIL FROM, DATA, or ".". This is a defer
3658 that is specific to the message.
3659 suppress_tls if TRUE, don't attempt a TLS connection - this is set for
3660 a second attempt after TLS initialization fails
3662 Returns: OK - the connection was made and the delivery attempted;
3663 the result for each address is in its data block.
3664 DEFER - the connection could not be made, or something failed
3665 while setting up the SMTP session, or there was a
3666 non-message-specific error, such as a timeout.
3667 ERROR - a filter command is specified for this transport,
3668 and there was a problem setting it up; OR helo_data
3669 or add_headers or authenticated_sender is specified
3670 for this transport, and the string failed to expand
3672 For all non-OK returns the first addr of the list carries the
3673 time taken for the attempt.
3677 smtp_deliver(address_item *addrlist, host_item *host, int host_af, int defport,
3678 uschar *interface, transport_instance *tblock,
3679 BOOL *message_defer, BOOL suppress_tls)
3681 smtp_transport_options_block * ob = SOB tblock->options_block;
3686 uschar *message = NULL;
3687 uschar new_message_id[MESSAGE_ID_LENGTH + 1];
3688 smtp_context * sx = store_get(sizeof(*sx), TRUE); /* tainted, for the data buffers */
3689 BOOL pass_message = FALSE;
3690 #ifdef EXPERIMENTAL_ESMTP_LIMITS
3691 BOOL mail_limit = FALSE;
3696 BOOL tcw_done = FALSE, tcw = FALSE;
3698 *message_defer = FALSE;
3700 memset(sx, 0, sizeof(*sx));
3701 sx->addrlist = addrlist;
3702 sx->conn_args.host = host;
3703 sx->conn_args.host_af = host_af;
3705 sx->conn_args.interface = interface;
3706 sx->helo_data = NULL;
3707 sx->conn_args.tblock = tblock;
3708 gettimeofday(&sx->delivery_start, NULL);
3709 sx->sync_addr = sx->first_addr = addrlist;
3716 /* Get the channel set up ready for a message, MAIL FROM being the next
3717 SMTP command to send. */
3719 if ((rc = smtp_setup_conn(sx, suppress_tls)) != OK)
3721 timesince(&addrlist->delivery_time, &sx->delivery_start);
3727 /* If the connection used DANE, ignore for now any addresses with incompatible
3728 domains. The SNI has to be the domain. Arrange a whole new TCP conn later,
3729 just in case only TLS isn't enough. */
3731 if (sx->conn_args.dane)
3733 const uschar * dane_domain = sx->first_addr->domain;
3735 for (address_item * a = sx->first_addr->next; a; a = a->next)
3736 if ( a->transport_return == PENDING_DEFER
3737 && Ustrcmp(dane_domain, a->domain) != 0)
3739 DEBUG(D_transport) debug_printf("DANE: holding %s for later\n", a->domain);
3741 a->transport_return = DANE;
3746 /* If there is a filter command specified for this transport, we can now
3747 set it up. This cannot be done until the identity of the host is known. */
3749 if (tblock->filter_command)
3751 transport_filter_timeout = tblock->filter_timeout;
3753 /* On failure, copy the error to all addresses, abandon the SMTP call, and
3756 if (!transport_set_up_command(&transport_filter_argv,
3757 tblock->filter_command, TRUE, DEFER, addrlist,
3758 string_sprintf("%.50s transport", tblock->name), NULL))
3760 set_errno_nohost(addrlist->next, addrlist->basic_errno, addrlist->message, DEFER,
3761 FALSE, &sx->delivery_start);
3766 if ( transport_filter_argv
3767 && *transport_filter_argv
3768 && **transport_filter_argv
3769 && sx->peer_offered & OPTION_CHUNKING
3770 #ifndef DISABLE_DKIM
3771 /* When dkim signing, chunking is handled even with a transport-filter */
3772 && !(ob->dkim.dkim_private_key && ob->dkim.dkim_domain && ob->dkim.dkim_selector)
3773 && !ob->dkim.force_bodyhash
3777 sx->peer_offered &= ~OPTION_CHUNKING;
3778 DEBUG(D_transport) debug_printf("CHUNKING not usable due to transport filter\n");
3782 /* For messages that have more than the maximum number of envelope recipients,
3783 we want to send several transactions down the same SMTP connection. (See
3784 comments in deliver.c as to how this reconciles, heuristically, with
3785 remote_max_parallel.) This optimization was added to Exim after the following
3786 code was already working. The simplest way to put it in without disturbing the
3787 code was to use a goto to jump back to this point when there is another
3788 transaction to handle. */
3791 sx->from_addr = return_path;
3792 sx->sync_addr = sx->first_addr;
3794 sx->send_rset = TRUE;
3795 sx->completed_addr = FALSE;
3798 /* If we are a continued-connection-after-verify the MAIL and RCPT
3799 commands were already sent; do not re-send but do mark the addrs as
3800 having been accepted up to RCPT stage. A traditional cont-conn
3801 always has a sequence number greater than one. */
3803 if (continue_hostname && continue_sequence == 1)
3805 /* sx->pending_MAIL = FALSE; */
3807 /* sx->next_addr = NULL; */
3809 for (address_item * addr = addrlist; addr; addr = addr->next)
3810 addr->transport_return = PENDING_OK;
3814 /* Initiate a message transfer. */
3816 switch(smtp_write_mail_and_rcpt_cmds(sx, &yield))
3819 case -1: case -2: goto RESPONSE_FAILED;
3820 case -3: goto END_OFF;
3821 case -4: goto SEND_QUIT;
3822 default: goto SEND_FAILED;
3825 /* If we are an MUA wrapper, abort if any RCPTs were rejected, either
3826 permanently or temporarily. We should have flushed and synced after the last
3834 for (a = sx->first_addr, cnt = 0; a && cnt < sx->max_rcpt; a = a->next, cnt++)
3835 if (a->transport_return != PENDING_OK)
3837 /*XXX could we find a better errno than 0 here? */
3838 set_errno_nohost(addrlist, 0, a->message, FAIL,
3839 testflag(a, af_pass_message), &sx->delivery_start);
3846 /* If ok is TRUE, we know we have got at least one good recipient, and must now
3847 send DATA, but if it is FALSE (in the normal, non-wrapper case), we may still
3848 have a good recipient buffered up if we are pipelining. We don't want to waste
3849 time sending DATA needlessly, so we only send it if either ok is TRUE or if we
3850 are pipelining. The responses are all handled by sync_responses().
3851 If using CHUNKING, do not send a BDAT until we know how big a chunk we want
3854 if ( !(sx->peer_offered & OPTION_CHUNKING)
3855 && (sx->ok || (pipelining_active && !mua_wrapper)))
3857 int count = smtp_write_command(sx, SCMD_FLUSH, "DATA\r\n");
3859 if (count < 0) goto SEND_FAILED;
3860 switch(sync_responses(sx, count, sx->ok ? +1 : -1))
3862 case 3: sx->ok = TRUE; /* 2xx & 5xx => OK & progress made */
3863 case 2: sx->completed_addr = TRUE; /* 5xx (only) => progress made */
3866 case 1: sx->ok = TRUE; /* 2xx (only) => OK, but if LMTP, */
3867 if (!sx->lmtp) sx->completed_addr = TRUE; /* can't tell about progress yet */
3868 case 0: break; /* No 2xx or 5xx, but no probs */
3870 case -1: goto END_OFF; /* Timeout on RCPT */
3872 #ifndef DISABLE_PIPE_CONNECT
3873 case -5: /* TLS first-read error */
3874 case -4: HDEBUG(D_transport)
3875 debug_printf("failed reaping pipelined cmd responses\n");
3877 default: goto RESPONSE_FAILED; /* I/O error, or any MAIL/DATA error */
3879 pipelining_active = FALSE;
3880 data_command = string_copy(big_buffer); /* Save for later error message */
3883 /* If there were no good recipients (but otherwise there have been no
3884 problems), just set ok TRUE, since we have handled address-specific errors
3885 already. Otherwise, it's OK to send the message. Use the check/escape mechanism
3886 for handling the SMTP dot-handling protocol, flagging to apply to headers as
3887 well as body. Set the appropriate timeout value to be used for each chunk.
3888 (Haven't been able to make it work using select() for writing yet.) */
3891 && (!(sx->peer_offered & OPTION_CHUNKING) || !pipelining_active))
3893 /* Save the first address of the next batch. */
3894 sx->first_addr = sx->next_addr;
3900 transport_ctx tctx = {
3901 .u = {.fd = sx->cctx.sock}, /*XXX will this need TLS info? */
3904 .check_string = US".",
3905 .escape_string = US"..", /* Escaping strings */
3907 topt_use_crlf | topt_escape_headers
3908 | (tblock->body_only ? topt_no_headers : 0)
3909 | (tblock->headers_only ? topt_no_body : 0)
3910 | (tblock->return_path_add ? topt_add_return_path : 0)
3911 | (tblock->delivery_date_add ? topt_add_delivery_date : 0)
3912 | (tblock->envelope_to_add ? topt_add_envelope_to : 0)
3915 /* If using CHUNKING we need a callback from the generic transport
3916 support to us, for the sending of BDAT smtp commands and the reaping
3917 of responses. The callback needs a whole bunch of state so set up
3918 a transport-context structure to be passed around. */
3920 if (sx->peer_offered & OPTION_CHUNKING)
3922 tctx.check_string = tctx.escape_string = NULL;
3923 tctx.options |= topt_use_bdat;
3924 tctx.chunk_cb = smtp_chunk_cmd_callback;
3925 sx->pending_BDAT = FALSE;
3926 sx->good_RCPT = sx->ok;
3928 tctx.smtp_context = sx;
3931 tctx.options |= topt_end_dot;
3933 /* Save the first address of the next batch. */
3934 sx->first_addr = sx->next_addr;
3936 /* Responses from CHUNKING commands go in buffer. Otherwise,
3937 there has not been a response. */
3941 sigalrm_seen = FALSE;
3942 transport_write_timeout = ob->data_timeout;
3943 smtp_command = US"sending data block"; /* For error messages */
3944 DEBUG(D_transport|D_v)
3945 if (sx->peer_offered & OPTION_CHUNKING)
3946 debug_printf(" will write message using CHUNKING\n");
3948 debug_printf(" SMTP>> writing message and terminating \".\"\n");
3949 transport_count = 0;
3951 #ifndef DISABLE_DKIM
3953 # ifdef MEASURE_TIMING
3955 gettimeofday(&t0, NULL);
3957 dkim_exim_sign_init();
3958 # ifdef EXPERIMENTAL_ARC
3960 uschar * s = ob->arc_sign;
3963 if (!(ob->dkim.arc_signspec = s = expand_string(s)))
3965 if (!f.expand_string_forcedfail)
3967 message = US"failed to expand arc_sign";
3974 /* Ask dkim code to hash the body for ARC */
3975 (void) arc_ams_setup_sign_bodyhash();
3976 ob->dkim.force_bodyhash = TRUE;
3981 # ifdef MEASURE_TIMING
3982 report_time_since(&t0, US"dkim_exim_sign_init (delta)");
3987 /* See if we can pipeline QUIT. Reasons not to are
3988 - pipelining not active
3989 - not ok to send quit
3990 - errors in amtp transation responses
3991 - more addrs to send for this message or this host
3992 - this message was being retried
3993 - more messages for this host
3994 If we can, we want the message-write to not flush (the tail end of) its data out. */
3996 if ( sx->pipelining_used
3997 && (sx->ok && sx->completed_addr || sx->peer_offered & OPTION_CHUNKING)
3999 && !(sx->first_addr || f.continue_more)
4000 && f.deliver_firsttime
4003 smtp_compare_t t_compare =
4004 {.tblock = tblock, .current_sender_address = sender_address};
4009 ( tls_out.active.sock < 0 && !continue_proxy_cipher
4010 || verify_check_given_host(CUSS &ob->hosts_nopass_tls, host) != OK
4014 transport_check_waiting(tblock->name, host->name,
4015 tblock->connection_max_messages, new_message_id,
4016 (oicf)smtp_are_same_identities, (void*)&t_compare);
4019 HDEBUG(D_transport) debug_printf("will pipeline QUIT\n");
4020 tctx.options |= topt_no_flush;
4024 #ifndef DISABLE_DKIM
4025 sx->ok = dkim_transport_write_message(&tctx, &ob->dkim, CUSS &message);
4027 sx->ok = transport_write_message(&tctx, 0);
4030 /* transport_write_message() uses write() because it is called from other
4031 places to write to non-sockets. This means that under some OS (e.g. Solaris)
4032 it can exit with "Broken pipe" as its error. This really means that the
4033 socket got closed at the far end. */
4035 transport_write_timeout = 0; /* for subsequent transports */
4037 /* Failure can either be some kind of I/O disaster (including timeout),
4038 or the failure of a transport filter or the expansion of added headers.
4039 Or, when CHUNKING, it can be a protocol-detected failure. */
4042 if (message) goto SEND_FAILED;
4043 else goto RESPONSE_FAILED;
4045 /* We used to send the terminating "." explicitly here, but because of
4046 buffering effects at both ends of TCP/IP connections, you don't gain
4047 anything by keeping it separate, so it might as well go in the final
4048 data buffer for efficiency. This is now done by setting the topt_end_dot
4051 smtp_command = US"end of data";
4053 /* If we can pipeline a QUIT with the data them send it now. If a new message
4054 for this host appeared in the queue while data was being sent, we will not see
4055 it and it will have to wait for a queue run. If there was one but another
4056 thread took it, we might attempt to send it - but locking of spoolfiles will
4057 detect that. Use _MORE to get QUIT in FIN segment. */
4059 if (tcw_done && !tcw)
4061 /*XXX jgh 2021/03/10 google et. al screwup. G, at least, sends TCP FIN in response to TLS
4062 close-notify. Under TLS 1.3, violating RFC.
4063 However, TLS 1.2 does not have half-close semantics. */
4065 if ( sx->cctx.tls_ctx
4066 #if 0 && !defined(DISABLE_TLS)
4067 && Ustrcmp(tls_out.ver, "TLS1.3") != 0
4069 || !f.deliver_firsttime
4071 { /* Send QUIT now and not later */
4072 (void)smtp_write_command(sx, SCMD_FLUSH, "QUIT\r\n");
4073 sx->send_quit = FALSE;
4076 { /* add QUIT to the output buffer */
4077 (void)smtp_write_command(sx, SCMD_MORE, "QUIT\r\n");
4078 sx->send_quit = FALSE; /* avoid sending it later */
4081 if (sx->cctx.tls_ctx) /* need to send TLS Close Notify */
4083 # ifdef EXIM_TCP_CORK /* Use _CORK to get Close Notify in FIN segment */
4084 (void) setsockopt(sx->cctx.sock, IPPROTO_TCP, EXIM_TCP_CORK, US &on, sizeof(on));
4086 tls_shutdown_wr(sx->cctx.tls_ctx);
4087 sx->send_tlsclose = FALSE; /* avoid later repeat */
4090 HDEBUG(D_transport|D_acl|D_v) debug_printf_indent(" SMTP(shutdown)>>\n");
4091 shutdown(sx->cctx.sock, SHUT_WR); /* flush output buffer, with TCP FIN */
4095 if (sx->peer_offered & OPTION_CHUNKING && sx->cmd_count > 1)
4097 /* Reap any outstanding MAIL & RCPT commands, but not a DATA-go-ahead */
4098 switch(sync_responses(sx, sx->cmd_count-1, 0))
4100 case 3: sx->ok = TRUE; /* 2xx & 5xx => OK & progress made */
4101 case 2: sx->completed_addr = TRUE; /* 5xx (only) => progress made */
4104 case 1: sx->ok = TRUE; /* 2xx (only) => OK, but if LMTP, */
4105 if (!sx->lmtp) sx->completed_addr = TRUE; /* can't tell about progress yet */
4106 case 0: break; /* No 2xx or 5xx, but no probs */
4108 case -1: goto END_OFF; /* Timeout on RCPT */
4110 #ifndef DISABLE_PIPE_CONNECT
4111 case -5: /* TLS first-read error */
4112 case -4: HDEBUG(D_transport)
4113 debug_printf("failed reaping pipelined cmd responses\n");
4115 default: goto RESPONSE_FAILED; /* I/O error, or any MAIL/DATA error */
4119 #ifndef DISABLE_PRDR
4120 /* For PRDR we optionally get a partial-responses warning followed by the
4121 individual responses, before going on with the overall response. If we don't
4122 get the warning then deal with per non-PRDR. */
4126 sx->ok = smtp_read_response(sx, sx->buffer, sizeof(sx->buffer), '3', ob->final_timeout);
4127 if (!sx->ok && errno == 0) switch(sx->buffer[0])
4129 case '2': sx->prdr_active = FALSE;
4132 case '4': errno = ERRNO_DATA4XX;
4133 addrlist->more_errno |=
4134 ((sx->buffer[1] - '0')*10 + sx->buffer[2] - '0') << 8;
4141 /* For non-PRDR SMTP, we now read a single response that applies to the
4142 whole message. If it is OK, then all the addresses have been delivered. */
4146 sx->ok = smtp_read_response(sx, sx->buffer, sizeof(sx->buffer), '2',
4148 if (!sx->ok && errno == 0 && sx->buffer[0] == '4')
4150 errno = ERRNO_DATA4XX;
4151 addrlist->more_errno |= ((sx->buffer[1] - '0')*10 + sx->buffer[2] - '0') << 8;
4155 /* For LMTP, we get back a response for every RCPT command that we sent;
4156 some may be accepted and some rejected. For those that get a response, their
4157 status is fixed; any that are accepted have been handed over, even if later
4158 responses crash - at least, that's how I read RFC 2033.
4160 If all went well, mark the recipient addresses as completed, record which
4161 host/IPaddress they were delivered to, and cut out RSET when sending another
4162 message down the same channel. Write the completed addresses to the journal
4163 now so that they are recorded in case there is a crash of hardware or
4164 software before the spool gets updated. Also record the final SMTP
4165 confirmation if needed (for SMTP only). */
4170 struct timeval delivery_time;
4172 uschar * conf = NULL;
4174 timesince(&delivery_time, &sx->delivery_start);
4175 sx->send_rset = FALSE;
4176 pipelining_active = FALSE;
4178 /* Set up confirmation if needed - applies only to SMTP */
4181 #ifdef DISABLE_EVENT
4182 LOGGING(smtp_confirmation) &&
4187 const uschar * s = string_printing(sx->buffer);
4188 /* deconst cast ok here as string_printing was checked to have alloc'n'copied */
4189 conf = s == sx->buffer ? US string_copy(s) : US s;
4192 /* Process all transported addresses - for LMTP or PRDR, read a status for
4193 each one. We used to drop out at first_addr, until someone returned a 452
4194 followed by a 250... and we screwed up the accepted addresses. */
4196 for (address_item * addr = addrlist; addr; addr = addr->next)
4198 if (addr->transport_return != PENDING_OK) continue;
4200 /* LMTP - if the response fails badly (e.g. timeout), use it for all the
4201 remaining addresses. Otherwise, it's a return code for just the one
4202 address. For temporary errors, add a retry item for the address so that
4203 it doesn't get tried again too soon. */
4205 #ifndef DISABLE_PRDR
4206 if (sx->lmtp || sx->prdr_active)
4211 if (!smtp_read_response(sx, sx->buffer, sizeof(sx->buffer), '2',
4214 if (errno != 0 || sx->buffer[0] == 0) goto RESPONSE_FAILED;
4215 addr->message = string_sprintf(
4216 #ifndef DISABLE_PRDR
4217 "%s error after %s: %s", sx->prdr_active ? "PRDR":"LMTP",
4219 "LMTP error after %s: %s",
4221 data_command, string_printing(sx->buffer));
4222 setflag(addr, af_pass_message); /* Allow message to go to user */
4223 if (sx->buffer[0] == '5')
4224 addr->transport_return = FAIL;
4227 errno = ERRNO_DATA4XX;
4228 addr->more_errno |= ((sx->buffer[1] - '0')*10 + sx->buffer[2] - '0') << 8;
4229 addr->transport_return = DEFER;
4230 #ifndef DISABLE_PRDR
4231 if (!sx->prdr_active)
4233 retry_add_item(addr, addr->address_retry_key, 0);
4237 sx->completed_addr = TRUE; /* NOW we can set this flag */
4238 if (LOGGING(smtp_confirmation))
4240 const uschar *s = string_printing(sx->buffer);
4241 /* deconst cast ok here as string_printing was checked to have alloc'n'copied */
4242 conf = (s == sx->buffer) ? US string_copy(s) : US s;
4246 /* SMTP, or success return from LMTP for this address. Pass back the
4247 actual host that was used. */
4249 addr->transport_return = OK;
4250 addr->host_used = host;
4251 addr->delivery_time = delivery_time;
4252 addr->special_action = flag;
4253 addr->message = conf;
4255 if (tcp_out_fastopen)
4257 setflag(addr, af_tcp_fastopen_conn);
4258 if (tcp_out_fastopen >= TFO_USED_NODATA) setflag(addr, af_tcp_fastopen);
4259 if (tcp_out_fastopen >= TFO_USED_DATA) setflag(addr, af_tcp_fastopen_data);
4261 if (sx->pipelining_used) setflag(addr, af_pipelining);
4262 #ifndef DISABLE_PIPE_CONNECT
4263 if (sx->early_pipe_active) setflag(addr, af_early_pipe);
4265 #ifndef DISABLE_PRDR
4266 if (sx->prdr_active) setflag(addr, af_prdr_used);
4268 if (sx->peer_offered & OPTION_CHUNKING) setflag(addr, af_chunking_used);
4271 #ifndef DISABLE_PRDR
4272 if (!sx->prdr_active)
4275 /* Update the journal. For homonymic addresses, use the base address plus
4276 the transport name. See lots of comments in deliver.c about the reasons
4277 for the complications when homonyms are involved. Just carry on after
4278 write error, as it may prove possible to update the spool file later. */
4280 if (testflag(addr, af_homonym))
4281 sprintf(CS sx->buffer, "%.500s/%s\n", addr->unique + 3, tblock->name);
4283 sprintf(CS sx->buffer, "%.500s\n", addr->unique);
4285 DEBUG(D_deliver) debug_printf("S:journalling %s", sx->buffer);
4286 len = Ustrlen(CS sx->buffer);
4287 if (write(journal_fd, sx->buffer, len) != len)
4288 log_write(0, LOG_MAIN|LOG_PANIC, "failed to write journal for "
4289 "%s: %s", sx->buffer, strerror(errno));
4293 #ifndef DISABLE_PRDR
4294 if (sx->prdr_active)
4296 const uschar * overall_message;
4298 /* PRDR - get the final, overall response. For any non-success
4299 upgrade all the address statuses. */
4301 sx->ok = smtp_read_response(sx, sx->buffer, sizeof(sx->buffer), '2',
4305 if(errno == 0 && sx->buffer[0] == '4')
4307 errno = ERRNO_DATA4XX;
4308 addrlist->more_errno |= ((sx->buffer[1] - '0')*10 + sx->buffer[2] - '0') << 8;
4310 for (address_item * addr = addrlist; addr != sx->first_addr; addr = addr->next)
4311 if (sx->buffer[0] == '5' || addr->transport_return == OK)
4312 addr->transport_return = PENDING_OK; /* allow set_errno action */
4313 goto RESPONSE_FAILED;
4316 /* Append the overall response to the individual PRDR response for logging
4317 and update the journal, or setup retry. */
4319 overall_message = string_printing(sx->buffer);
4320 for (address_item * addr = addrlist; addr != sx->first_addr; addr = addr->next)
4321 if (addr->transport_return == OK)
4322 addr->message = string_sprintf("%s\\n%s", addr->message, overall_message);
4324 for (address_item * addr = addrlist; addr != sx->first_addr; addr = addr->next)
4325 if (addr->transport_return == OK)
4327 if (testflag(addr, af_homonym))
4328 sprintf(CS sx->buffer, "%.500s/%s\n", addr->unique + 3, tblock->name);
4330 sprintf(CS sx->buffer, "%.500s\n", addr->unique);
4332 DEBUG(D_deliver) debug_printf("journalling(PRDR) %s\n", sx->buffer);
4333 len = Ustrlen(CS sx->buffer);
4334 if (write(journal_fd, sx->buffer, len) != len)
4335 log_write(0, LOG_MAIN|LOG_PANIC, "failed to write journal for "
4336 "%s: %s", sx->buffer, strerror(errno));
4338 else if (addr->transport_return == DEFER)
4339 /*XXX magic value -2 ? maybe host+message ? */
4340 retry_add_item(addr, addr->address_retry_key, -2);
4344 /* Ensure the journal file is pushed out to disk. */
4346 if (EXIMfsync(journal_fd) < 0)
4347 log_write(0, LOG_MAIN|LOG_PANIC, "failed to fsync journal: %s",
4353 /* Handle general (not specific to one address) failures here. The value of ok
4354 is used to skip over this code on the falling through case. A timeout causes a
4355 deferral. Other errors may defer or fail according to the response code, and
4356 may set up a special errno value, e.g. after connection chopped, which is
4357 assumed if errno == 0 and there is no text in the buffer. If control reaches
4358 here during the setting up phase (i.e. before MAIL FROM) then always defer, as
4359 the problem is not related to this specific message. */
4364 uschar * set_message;
4370 /* Clear send_quit flag if needed. Do not set. */
4371 sx->send_quit &= check_response(host, &save_errno, addrlist->more_errno,
4372 sx->buffer, &code, &message, &pass_message);
4380 message = string_sprintf("smtp send to %s [%s] failed: %s",
4381 host->name, host->address, message ? message : US strerror(save_errno));
4382 sx->send_quit = FALSE;
4390 sx->ok = FALSE; /* For when reached by GOTO */
4391 set_message = message;
4393 /* We want to handle timeouts after MAIL or "." and loss of connection after
4394 "." specially. They can indicate a problem with the sender address or with
4395 the contents of the message rather than a real error on the connection. These
4396 cases are treated in the same way as a 4xx response. This next bit of code
4397 does the classification. */
4404 message_error = TRUE;
4408 message_error = Ustrncmp(smtp_command,"MAIL",4) == 0 ||
4409 Ustrncmp(smtp_command,"end ",4) == 0;
4412 case ERRNO_SMTPCLOSED:
4413 message_error = Ustrncmp(smtp_command,"end ",4) == 0;
4416 #ifndef DISABLE_DKIM
4418 /* DKIM signing failure: avoid thinking we pipelined quit,
4419 just abandon the message and close the socket. */
4421 message_error = FALSE;
4422 # ifndef DISABLE_TLS
4423 if (sx->cctx.tls_ctx)
4425 tls_close(sx->cctx.tls_ctx, TLS_SHUTDOWN_WAIT);
4426 sx->cctx.tls_ctx = NULL;
4432 message_error = FALSE;
4436 /* Handle the cases that are treated as message errors. These are:
4438 (a) negative response or timeout after MAIL
4439 (b) negative response after DATA
4440 (c) negative response or timeout or dropped connection after "."
4441 (d) utf8 support required and not offered
4443 It won't be a negative response or timeout after RCPT, as that is dealt
4444 with separately above. The action in all cases is to set an appropriate
4445 error code for all the addresses, but to leave yield set to OK because the
4446 host itself has not failed. Of course, it might in practice have failed
4447 when we've had a timeout, but if so, we'll discover that at the next
4448 delivery attempt. For a temporary error, set the message_defer flag, and
4449 write to the logs for information if this is not the last host. The error
4450 for the last host will be logged as part of the address's log line. */
4454 if (mua_wrapper) code = '5'; /* Force hard failure in wrapper mode */
4456 /* If there's an errno, the message contains just the identity of
4461 else /* Anything other than 5 is treated as temporary */
4465 message = US string_sprintf("%s: %s", message, strerror(save_errno));
4467 write_logs(host, message, sx->first_addr ? sx->first_addr->basic_errno : 0);
4469 *message_defer = TRUE;
4472 DEBUG(D_transport) if (sx->cctx.sock >= 0)
4475 if (ioctl(sx->cctx.sock, TIOCOUTQ, &n) == 0)
4476 debug_printf("%d bytes remain in socket output buffer\n", n);
4480 /* Otherwise, we have an I/O error or a timeout other than after MAIL or
4481 ".", or some other transportation error. We defer all addresses and yield
4482 DEFER, except for the case of failed add_headers expansion, or a transport
4483 filter failure, when the yield should be ERROR, to stop it trying other
4488 #ifndef DISABLE_PIPE_CONNECT
4489 /* If we were early-pipelinng and the actual EHLO response did not match
4490 the cached value we assumed, we could have detected it and passed a
4491 custom errno through to here. It would be nice to RSET and retry right
4492 away, but to reliably do that we eould need an extra synch point before
4493 we committed to data and that would discard half the gained roundrips.
4494 Or we could summarily drop the TCP connection. but that is also ugly.
4495 Instead, we ignore the possibility (having freshened the cache) and rely
4496 on the server telling us with a nonmessage error if we have tried to
4497 do something it no longer supports. */
4500 yield = (save_errno == ERRNO_CHHEADER_FAIL ||
4501 save_errno == ERRNO_FILTER_FAIL) ? ERROR : DEFER;
4505 set_errno(addrlist, save_errno, set_message, set_rc, pass_message, host,
4506 #ifdef EXPERIMENTAL_DSN_INFO
4507 sx->smtp_greeting, sx->helo_response,
4509 &sx->delivery_start);
4512 /* If all has gone well, send_quit will be set TRUE, implying we can end the
4513 SMTP session tidily. However, if there were too many addresses to send in one
4514 message (indicated by first_addr being non-NULL) we want to carry on with the
4515 rest of them. Also, it is desirable to send more than one message down the SMTP
4516 connection if there are several waiting, provided we haven't already sent so
4517 many as to hit the configured limit. The function transport_check_waiting looks
4518 for a waiting message and returns its id. Then transport_pass_socket tries to
4519 set up a continued delivery by passing the socket on to another process. The
4520 variable send_rset is FALSE if a message has just been successfully transferred.
4522 If we are already sending down a continued channel, there may be further
4523 addresses not yet delivered that are aimed at the same host, but which have not
4524 been passed in this run of the transport. In this case, continue_more will be
4525 true, and all we should do is send RSET if necessary, and return, leaving the
4528 However, if no address was disposed of, i.e. all addresses got 4xx errors, we
4529 do not want to continue with other messages down the same channel, because that
4530 can lead to looping between two or more messages, all with the same,
4531 temporarily failing address(es). [The retry information isn't updated yet, so
4532 new processes keep on trying.] We probably also don't want to try more of this
4533 message's addresses either.
4535 If we have started a TLS session, we have to end it before passing the
4536 connection to a new process. However, not all servers can handle this (Exim
4537 can), so we do not pass such a connection on if the host matches
4538 hosts_nopass_tls. */
4541 debug_printf("ok=%d send_quit=%d send_rset=%d continue_more=%d "
4542 "yield=%d first_address is %sNULL\n", sx->ok, sx->send_quit,
4543 sx->send_rset, f.continue_more, yield, sx->first_addr ? "not " : "");
4545 if (sx->completed_addr && sx->ok && sx->send_quit)
4546 #ifdef EXPERIMENTAL_ESMTP_LIMITS
4547 if (mail_limit = continue_sequence >= sx->max_mail)
4550 debug_printf("reached limit %u for MAILs per conn\n", sx->max_mail);
4555 smtp_compare_t t_compare =
4556 {.tblock = tblock, .current_sender_address = sender_address};
4558 if ( sx->first_addr /* more addrs for this message */
4559 || f.continue_more /* more addrs for continued-host */
4560 || tcw_done && tcw /* more messages for host */
4563 ( tls_out.active.sock < 0 && !continue_proxy_cipher
4564 || verify_check_given_host(CUSS &ob->hosts_nopass_tls, host) != OK
4568 transport_check_waiting(tblock->name, host->name,
4569 sx->max_mail, new_message_id,
4570 (oicf)smtp_are_same_identities, (void*)&t_compare)
4577 if (! (sx->ok = smtp_write_command(sx, SCMD_FLUSH, "RSET\r\n") >= 0))
4579 msg = US string_sprintf("smtp send to %s [%s] failed: %s", host->name,
4580 host->address, strerror(errno));
4581 sx->send_quit = FALSE;
4583 else if (! (sx->ok = smtp_read_response(sx, sx->buffer, sizeof(sx->buffer),
4584 '2', ob->command_timeout)))
4587 sx->send_quit = check_response(host, &errno, 0, sx->buffer, &code, &msg,
4591 DEBUG(D_transport) debug_printf("H=%s [%s] %s\n",
4592 host->name, host->address, msg);
4596 /* Either RSET was not needed, or it succeeded */
4603 int socket_fd = sx->cctx.sock;
4605 if (sx->first_addr) /* More addresses still to be sent */
4606 { /* for this message */
4607 #ifdef EXPERIMENTAL_ESMTP_LIMITS
4608 /* Any that we marked as skipped, reset to do now */
4609 for (address_item * a = sx->first_addr; a; a = a->next)
4610 if (a->transport_return == SKIP)
4611 a->transport_return = PENDING_DEFER;
4613 continue_sequence++; /* for consistency */
4614 clearflag(sx->first_addr, af_new_conn);
4615 setflag(sx->first_addr, af_cont_conn); /* Causes * in logging */
4616 pipelining_active = sx->pipelining_used; /* was cleared at DATA */
4620 /* Unless caller said it already has more messages listed for this host,
4621 pass the connection on to a new Exim process (below, the call to
4622 transport_pass_socket). If the caller has more ready, just return with
4623 the connection still open. */
4626 if (tls_out.active.sock >= 0)
4627 if ( f.continue_more
4628 || verify_check_given_host(CUSS &ob->hosts_noproxy_tls, host) == OK)
4630 /* Before passing the socket on, or returning to caller with it still
4631 open, we must shut down TLS. Not all MTAs allow for the continuation
4632 of the SMTP session when TLS is shut down. We test for this by sending
4633 a new EHLO. If we don't get a good response, we don't attempt to pass
4636 tls_close(sx->cctx.tls_ctx, TLS_SHUTDOWN_WAIT);
4637 sx->send_tlsclose = FALSE;
4638 sx->cctx.tls_ctx = NULL;
4639 tls_out.active.sock = -1;
4640 smtp_peer_options = smtp_peer_options_wrap;
4642 && smtp_write_command(sx, SCMD_FLUSH, "EHLO %s\r\n", sx->helo_data)
4644 && smtp_read_response(sx, sx->buffer, sizeof(sx->buffer),
4645 '2', ob->command_timeout);
4647 if (sx->ok && f.continue_more)
4648 goto TIDYUP; /* More addresses for another run */
4652 /* Set up a pipe for proxying TLS for the new transport process */
4654 smtp_peer_options |= OPTION_TLS;
4655 if ((sx->ok = socketpair(AF_UNIX, SOCK_STREAM, 0, pfd) == 0))
4658 set_errno(sx->first_addr, errno, US"internal allocation problem",
4660 # ifdef EXPERIMENTAL_DSN_INFO
4661 sx->smtp_greeting, sx->helo_response,
4663 &sx->delivery_start);
4667 if (f.continue_more)
4668 goto TIDYUP; /* More addresses for another run */
4670 /* If the socket is successfully passed, we mustn't send QUIT (or
4671 indeed anything!) from here. */
4673 /*XXX DSN_INFO: assume likely to do new HELO; but for greet we'll want to
4674 propagate it from the initial
4676 if (sx->ok && transport_pass_socket(tblock->name, host->name,
4677 host->address, new_message_id, socket_fd
4678 #ifdef EXPERIMENTAL_ESMTP_LIMITS
4679 , sx->peer_limit_mail, sx->peer_limit_rcpt, sx->peer_limit_rcptdom
4683 sx->send_quit = FALSE;
4685 /* We have passed the client socket to a fresh transport process.
4686 If TLS is still active, we need to proxy it for the transport we
4687 just passed the baton to. Fork a child to to do it, and return to
4688 get logging done asap. Which way to place the work makes assumptions
4689 about post-fork prioritisation which may not hold on all platforms. */
4691 if (tls_out.active.sock >= 0)
4693 int pid = exim_fork(US"tls-proxy-interproc");
4694 if (pid == 0) /* child; fork again to disconnect totally */
4696 /* does not return */
4697 smtp_proxy_tls(sx->cctx.tls_ctx, sx->buffer, sizeof(sx->buffer), pfd,
4698 ob->command_timeout);
4701 if (pid > 0) /* parent */
4704 /* tidy the inter-proc to disconn the proxy proc */
4705 waitpid(pid, NULL, 0);
4706 tls_close(sx->cctx.tls_ctx, TLS_NO_SHUTDOWN);
4707 sx->cctx.tls_ctx = NULL;
4708 (void)close(sx->cctx.sock);
4710 continue_transport = NULL;
4711 continue_hostname = NULL;
4714 log_write(0, LOG_PANIC_DIE, "fork failed");
4720 /* If RSET failed and there are addresses left, they get deferred. */
4722 set_errno(sx->first_addr, errno, msg, DEFER, FALSE, host,
4723 #ifdef EXPERIMENTAL_DSN_INFO
4724 sx->smtp_greeting, sx->helo_response,
4726 &sx->delivery_start);
4730 /* End off tidily with QUIT unless the connection has died or the socket has
4731 been passed to another process. */
4735 { /* Use _MORE to get QUIT in FIN segment */
4736 (void)smtp_write_command(sx, SCMD_MORE, "QUIT\r\n");
4738 if (sx->cctx.tls_ctx)
4740 # ifdef EXIM_TCP_CORK /* Use _CORK to get TLS Close Notify in FIN segment */
4741 (void) setsockopt(sx->cctx.sock, IPPROTO_TCP, EXIM_TCP_CORK, US &on, sizeof(on));
4743 tls_shutdown_wr(sx->cctx.tls_ctx);
4744 sx->send_tlsclose = FALSE;
4751 /* Close the socket, and return the appropriate value, first setting
4752 works because the NULL setting is passed back to the calling process, and
4753 remote_max_parallel is forced to 1 when delivering over an existing connection,
4755 If all went well and continue_more is set, we shouldn't actually get here if
4756 there are further addresses, as the return above will be taken. However,
4757 writing RSET might have failed, or there may be other addresses whose hosts are
4758 specified in the transports, and therefore not visible at top level, in which
4759 case continue_more won't get set. */
4763 /* This flushes data queued in the socket, being the QUIT and any TLS Close,
4764 sending them along with the client FIN flag. Us (we hope) sending FIN first
4765 means we (client) take the TIME_WAIT state, so the server (which likely has a
4766 higher connection rate) does not have to. */
4768 HDEBUG(D_transport|D_acl|D_v) debug_printf_indent(" SMTP(shutdown)>>\n");
4769 shutdown(sx->cctx.sock, SHUT_WR);
4772 if (sx->send_quit || tcw_done && !tcw)
4774 /* Wait for (we hope) ack of our QUIT, and a server FIN. Discard any data
4775 received, then discard the socket. Any packet received after then, or receive
4776 data still in the socket, will get a RST - hence the pause/drain. */
4778 /* Reap the response to QUIT, timing out after one second */
4779 (void) smtp_read_response(sx, sx->buffer, sizeof(sx->buffer), '2', 1);
4781 if (sx->cctx.tls_ctx)
4785 /* Reap the TLS Close Notify from the server, timing out after one second */
4786 sigalrm_seen = FALSE;
4789 n = tls_read(sx->cctx.tls_ctx, sx->inbuffer, sizeof(sx->inbuffer));
4790 while (!sigalrm_seen && n > 0);
4793 # ifdef EXIM_TCP_CORK
4794 (void) setsockopt(sx->cctx.sock, IPPROTO_TCP, EXIM_TCP_CORK, US &on, sizeof(on));
4796 tls_close(sx->cctx.tls_ctx, TLS_SHUTDOWN_WAIT);
4797 sx->cctx.tls_ctx = NULL;
4801 /* Drain any trailing data from the socket before close, to avoid sending a RST */
4803 if ( poll_one_fd(sx->cctx.sock, POLLIN, 20) != 0 /* 20ms */
4804 && fcntl(sx->cctx.sock, F_SETFL, O_NONBLOCK) == 0)
4805 for (int i = 16, n; /* drain socket */
4806 (n = read(sx->cctx.sock, sx->inbuffer, sizeof(sx->inbuffer))) > 0 && i > 0;
4807 i--) HDEBUG(D_transport|D_acl|D_v)
4810 debug_printf_indent(" SMTP(drain %d bytes)<< %.*s\n", n, m, sx->inbuffer);
4811 for (m = 0; m < n; m++)
4812 debug_printf("0x%02x\n", sx->inbuffer[m]);
4815 HDEBUG(D_transport|D_acl|D_v) debug_printf_indent(" SMTP(close)>>\n");
4816 (void)close(sx->cctx.sock);
4818 continue_transport = NULL;
4819 continue_hostname = NULL;
4821 #ifndef DISABLE_EVENT
4822 (void) event_raise(tblock->event_action, US"tcp:close", NULL, NULL);
4828 sx->first_addr = NULL;
4829 for (address_item * a = sx->addrlist->next; a; a = a->next)
4830 if (a->transport_return == DANE)
4832 a->transport_return = PENDING_DEFER;
4833 if (!sx->first_addr)
4835 /* Remember the new start-point in the addrlist, for smtp_setup_conn()
4836 to get the domain string for SNI */
4839 clearflag(a, af_cont_conn);
4840 setflag(a, af_new_conn); /* clear * from logging */
4841 DEBUG(D_transport) debug_printf("DANE: go-around for %s\n", a->domain);
4844 continue_sequence = 1; /* for consistency */
4849 #ifdef EXPERIMENTAL_ESMTP_LIMITS
4850 if (mail_limit && sx->first_addr)
4852 /* Reset the sequence count since we closed the connection. This is flagged
4853 on the pipe back to the delivery process so that a non-continued-conn delivery
4856 continue_sequence = 1; /* for consistency */
4857 clearflag(sx->first_addr, af_cont_conn);
4858 setflag(sx->first_addr, af_new_conn); /* clear * from logging */
4867 if (dane_held) for (address_item * a = sx->addrlist->next; a; a = a->next)
4868 if (a->transport_return == DANE)
4869 a->transport_return = PENDING_DEFER;
4877 /*************************************************
4878 * Closedown entry point *
4879 *************************************************/
4881 /* This function is called when exim is passed an open smtp channel
4882 from another incarnation, but the message which it has been asked
4883 to deliver no longer exists. The channel is on stdin.
4885 We might do fancy things like looking for another message to send down
4886 the channel, but if the one we sought has gone, it has probably been
4887 delivered by some other process that itself will seek further messages,
4888 so just close down our connection.
4890 Argument: pointer to the transport instance block
4895 smtp_transport_closedown(transport_instance *tblock)
4897 smtp_transport_options_block * ob = SOB tblock->options_block;
4898 client_conn_ctx cctx;
4901 uschar inbuffer[4096];
4902 uschar outbuffer[16];
4904 /*XXX really we need an active-smtp-client ctx, rather than assuming stdout */
4905 cctx.sock = fileno(stdin);
4906 cctx.tls_ctx = cctx.sock == tls_out.active.sock ? tls_out.active.tls_ctx : NULL;
4908 sx.inblock.cctx = &cctx;
4909 sx.inblock.buffer = inbuffer;
4910 sx.inblock.buffersize = sizeof(inbuffer);
4911 sx.inblock.ptr = inbuffer;
4912 sx.inblock.ptrend = inbuffer;
4914 sx.outblock.cctx = &cctx;
4915 sx.outblock.buffersize = sizeof(outbuffer);
4916 sx.outblock.buffer = outbuffer;
4917 sx.outblock.ptr = outbuffer;
4918 sx.outblock.cmd_count = 0;
4919 sx.outblock.authenticating = FALSE;
4921 (void)smtp_write_command(&sx, SCMD_FLUSH, "QUIT\r\n");
4922 (void)smtp_read_response(&sx, buffer, sizeof(buffer), '2', ob->command_timeout);
4923 (void)close(cctx.sock);
4928 /*************************************************
4929 * Prepare addresses for delivery *
4930 *************************************************/
4932 /* This function is called to flush out error settings from previous delivery
4933 attempts to other hosts. It also records whether we got here via an MX record
4934 or not in the more_errno field of the address. We are interested only in
4935 addresses that are still marked DEFER - others may have got delivered to a
4936 previously considered IP address. Set their status to PENDING_DEFER to indicate
4937 which ones are relevant this time.
4940 addrlist the list of addresses
4941 host the host we are delivering to
4943 Returns: the first address for this delivery
4946 static address_item *
4947 prepare_addresses(address_item *addrlist, host_item *host)
4949 address_item *first_addr = NULL;
4950 for (address_item * addr = addrlist; addr; addr = addr->next)
4951 if (addr->transport_return == DEFER)
4953 if (!first_addr) first_addr = addr;
4954 addr->transport_return = PENDING_DEFER;
4955 addr->basic_errno = 0;
4956 addr->more_errno = (host->mx >= 0)? 'M' : 'A';
4957 addr->message = NULL;
4959 addr->cipher = NULL;
4960 addr->ourcert = NULL;
4961 addr->peercert = NULL;
4962 addr->peerdn = NULL;
4963 addr->ocsp = OCSP_NOT_REQ;
4964 addr->tlsver = NULL;
4966 #ifdef EXPERIMENTAL_DSN_INFO
4967 addr->smtp_greeting = NULL;
4968 addr->helo_response = NULL;
4976 /*************************************************
4977 * Main entry point *
4978 *************************************************/
4980 /* See local README for interface details. As this is a remote transport, it is
4981 given a chain of addresses to be delivered in one connection, if possible. It
4982 always returns TRUE, indicating that each address has its own independent
4983 status set, except if there is a setting up problem, in which case it returns
4987 smtp_transport_entry(
4988 transport_instance *tblock, /* data for this instantiation */
4989 address_item *addrlist) /* addresses we are working on */
4992 int hosts_defer = 0;
4994 int hosts_looked_up = 0;
4995 int hosts_retry = 0;
4996 int hosts_serial = 0;
4997 int hosts_total = 0;
4998 int total_hosts_tried = 0;
4999 BOOL expired = TRUE;
5000 uschar *expanded_hosts = NULL;
5002 uschar *tid = string_sprintf("%s transport", tblock->name);
5003 smtp_transport_options_block *ob = SOB tblock->options_block;
5004 host_item *hostlist = addrlist->host_list;
5005 host_item *host = NULL;
5009 debug_printf("%s transport entered\n", tblock->name);
5010 for (address_item * addr = addrlist; addr; addr = addr->next)
5011 debug_printf(" %s\n", addr->address);
5014 debug_printf("hostlist:\n");
5015 for (host_item * host = hostlist; host; host = host->next)
5016 debug_printf(" '%s' IP %s port %d\n", host->name, host->address, host->port);
5018 if (continue_hostname)
5019 debug_printf("already connected to %s [%s] (on fd %d)\n",
5020 continue_hostname, continue_host_address,
5021 cutthrough.cctx.sock >= 0 ? cutthrough.cctx.sock : 0);
5024 /* Check the restrictions on line length */
5026 if (max_received_linelength > ob->message_linelength_limit)
5029 gettimeofday(&now, NULL);
5031 for (address_item * addr = addrlist; addr; addr = addr->next)
5032 if (addr->transport_return == DEFER)
5033 addr->transport_return = PENDING_DEFER;
5035 set_errno_nohost(addrlist, ERRNO_SMTPFORMAT,
5036 US"message has lines too long for transport", FAIL, TRUE, &now);
5040 /* Set the flag requesting that these hosts be added to the waiting
5041 database if the delivery fails temporarily or if we are running with
5042 queue_smtp or a 2-stage queue run. This gets unset for certain
5043 kinds of error, typically those that are specific to the message. */
5045 update_waiting = TRUE;
5047 /* If a host list is not defined for the addresses - they must all have the
5048 same one in order to be passed to a single transport - or if the transport has
5049 a host list with hosts_override set, use the host list supplied with the
5050 transport. It is an error for this not to exist. */
5052 if (!hostlist || (ob->hosts_override && ob->hosts))
5056 addrlist->message = string_sprintf("%s transport called with no hosts set",
5058 addrlist->transport_return = PANIC;
5059 return FALSE; /* Only top address has status */
5062 DEBUG(D_transport) debug_printf("using the transport's hosts: %s\n",
5065 /* If the transport's host list contains no '$' characters, and we are not
5066 randomizing, it is fixed and therefore a chain of hosts can be built once
5067 and for all, and remembered for subsequent use by other calls to this
5068 transport. If, on the other hand, the host list does contain '$', or we are
5069 randomizing its order, we have to rebuild it each time. In the fixed case,
5070 as the hosts string will never be used again, it doesn't matter that we
5071 replace all the : characters with zeros. */
5075 uschar *s = ob->hosts;
5077 if (Ustrchr(s, '$'))
5079 if (!(expanded_hosts = expand_string(s)))
5081 addrlist->message = string_sprintf("failed to expand list of hosts "
5082 "\"%s\" in %s transport: %s", s, tblock->name, expand_string_message);
5083 addrlist->transport_return = f.search_find_defer ? DEFER : PANIC;
5084 return FALSE; /* Only top address has status */
5086 DEBUG(D_transport) debug_printf("expanded list of hosts \"%s\" to "
5087 "\"%s\"\n", s, expanded_hosts);
5091 if (ob->hosts_randomize) s = expanded_hosts = string_copy(s);
5093 if (is_tainted2(s, LOG_MAIN|LOG_PANIC, "Tainted host list '%s' from '%s' in transport %s", s, ob->hosts, tblock->name))
5095 /* Avoid leaking info to an attacker */
5096 addrlist->message = US"internal configuration error";
5097 addrlist->transport_return = PANIC;
5101 host_build_hostlist(&hostlist, s, ob->hosts_randomize);
5103 /* Check that the expansion yielded something useful. */
5107 string_sprintf("%s transport has empty hosts setting", tblock->name);
5108 addrlist->transport_return = PANIC;
5109 return FALSE; /* Only top address has status */
5112 /* If there was no expansion of hosts, save the host list for
5115 if (!expanded_hosts) ob->hostlist = hostlist;
5118 /* This is not the first time this transport has been run in this delivery;
5119 the host list was built previously. */
5122 hostlist = ob->hostlist;
5125 /* The host list was supplied with the address. If hosts_randomize is set, we
5126 must sort it into a random order if it did not come from MX records and has not
5127 already been randomized (but don't bother if continuing down an existing
5130 else if (ob->hosts_randomize && hostlist->mx == MX_NONE && !continue_hostname)
5132 host_item *newlist = NULL;
5135 host_item *h = hostlist;
5136 hostlist = hostlist->next;
5138 h->sort_key = random_number(100);
5145 else if (h->sort_key < newlist->sort_key)
5152 host_item *hh = newlist;
5155 if (h->sort_key < hh->next->sort_key) break;
5163 hostlist = addrlist->host_list = newlist;
5166 /* Sort out the default port. */
5168 if (!smtp_get_port(ob->port, addrlist, &defport, tid)) return FALSE;
5170 /* For each host-plus-IP-address on the list:
5172 . If this is a continued delivery and the host isn't the one with the
5173 current connection, skip.
5175 . If the status is unusable (i.e. previously failed or retry checked), skip.
5177 . If no IP address set, get the address, either by turning the name into
5178 an address, calling gethostbyname if gethostbyname is on, or by calling
5179 the DNS. The DNS may yield multiple addresses, in which case insert the
5180 extra ones into the list.
5182 . Get the retry data if not previously obtained for this address and set the
5183 field which remembers the state of this address. Skip if the retry time is
5184 not reached. If not, remember whether retry data was found. The retry string
5185 contains both the name and the IP address.
5187 . Scan the list of addresses and mark those whose status is DEFER as
5188 PENDING_DEFER. These are the only ones that will be processed in this cycle
5191 . Make a delivery attempt - addresses marked PENDING_DEFER will be tried.
5192 Some addresses may be successfully delivered, others may fail, and yet
5193 others may get temporary errors and so get marked DEFER.
5195 . The return from the delivery attempt is OK if a connection was made and a
5196 valid SMTP dialogue was completed. Otherwise it is DEFER.
5198 . If OK, add a "remove" retry item for this host/IPaddress, if any.
5200 . If fail to connect, or other defer state, add a retry item.
5202 . If there are any addresses whose status is still DEFER, carry on to the
5203 next host/IPaddress, unless we have tried the number of hosts given
5204 by hosts_max_try or hosts_max_try_hardlimit; otherwise return. Note that
5205 there is some fancy logic for hosts_max_try that means its limit can be
5206 overstepped in some circumstances.
5208 If we get to the end of the list, all hosts have deferred at least one address,
5209 or not reached their retry times. If delay_after_cutoff is unset, it requests a
5210 delivery attempt to those hosts whose last try was before the arrival time of
5211 the current message. To cope with this, we have to go round the loop a second
5212 time. After that, set the status and error data for any addresses that haven't
5213 had it set already. */
5215 for (int cutoff_retry = 0;
5216 expired && cutoff_retry < (ob->delay_after_cutoff ? 1 : 2);
5219 host_item *nexthost = NULL;
5220 int unexpired_hosts_tried = 0;
5221 BOOL continue_host_tried = FALSE;
5223 retry_non_continued:
5224 for (host = hostlist;
5226 && unexpired_hosts_tried < ob->hosts_max_try
5227 && total_hosts_tried < ob->hosts_max_try_hardlimit;
5232 BOOL host_is_expired = FALSE;
5233 BOOL message_defer = FALSE;
5234 BOOL some_deferred = FALSE;
5235 address_item *first_addr = NULL;
5236 uschar *interface = NULL;
5237 uschar *retry_host_key = NULL;
5238 uschar *retry_message_key = NULL;
5239 uschar *serialize_key = NULL;
5241 /* Default next host is next host. :-) But this can vary if the
5242 hosts_max_try limit is hit (see below). It may also be reset if a host
5243 address is looked up here (in case the host was multihomed). */
5245 nexthost = host->next;
5247 /* If the address hasn't yet been obtained from the host name, look it up
5248 now, unless the host is already marked as unusable. If it is marked as
5249 unusable, it means that the router was unable to find its IP address (in
5250 the DNS or wherever) OR we are in the 2nd time round the cutoff loop, and
5251 the lookup failed last time. We don't get this far if *all* MX records
5252 point to non-existent hosts; that is treated as a hard error.
5254 We can just skip this host entirely. When the hosts came from the router,
5255 the address will timeout based on the other host(s); when the address is
5256 looked up below, there is an explicit retry record added.
5258 Note that we mustn't skip unusable hosts if the address is not unset; they
5259 may be needed as expired hosts on the 2nd time round the cutoff loop. */
5263 int new_port, flags;
5265 if (host->status >= hstatus_unusable)
5267 DEBUG(D_transport) debug_printf("%s has no address and is unusable - skipping\n",
5272 DEBUG(D_transport) debug_printf("getting address for %s\n", host->name);
5274 /* The host name is permitted to have an attached port. Find it, and
5275 strip it from the name. Just remember it for now. */
5277 new_port = host_item_get_port(host);
5279 /* Count hosts looked up */
5283 /* Find by name if so configured, or if it's an IP address. We don't
5284 just copy the IP address, because we need the test-for-local to happen. */
5286 flags = HOST_FIND_BY_A | HOST_FIND_BY_AAAA;
5287 if (ob->dns_qualify_single) flags |= HOST_FIND_QUALIFY_SINGLE;
5288 if (ob->dns_search_parents) flags |= HOST_FIND_SEARCH_PARENTS;
5290 if (ob->gethostbyname || string_is_ip_address(host->name, NULL) != 0)
5291 rc = host_find_byname(host, NULL, flags, NULL, TRUE);
5293 rc = host_find_bydns(host, NULL, flags, NULL, NULL, NULL,
5294 &ob->dnssec, /* domains for request/require */
5297 /* Update the host (and any additional blocks, resulting from
5298 multihoming) with a host-specific port, if any. */
5300 for (host_item * hh = host; hh != nexthost; hh = hh->next) hh->port = new_port;
5302 /* Failure to find the host at this time (usually DNS temporary failure)
5303 is really a kind of routing failure rather than a transport failure.
5304 Therefore we add a retry item of the routing kind, not to stop us trying
5305 to look this name up here again, but to ensure the address gets timed
5306 out if the failures go on long enough. A complete failure at this point
5307 commonly points to a configuration error, but the best action is still
5308 to carry on for the next host. */
5310 if (rc == HOST_FIND_AGAIN || rc == HOST_FIND_SECURITY || rc == HOST_FIND_FAILED)
5312 retry_add_item(addrlist, string_sprintf("R:%s", host->name), 0);
5314 if (rc == HOST_FIND_AGAIN) hosts_defer++; else hosts_fail++;
5315 DEBUG(D_transport) debug_printf("rc = %s for %s\n", (rc == HOST_FIND_AGAIN)?
5316 "HOST_FIND_AGAIN" : "HOST_FIND_FAILED", host->name);
5317 host->status = hstatus_unusable;
5319 for (address_item * addr = addrlist; addr; addr = addr->next)
5321 if (addr->transport_return != DEFER) continue;
5322 addr->basic_errno = ERRNO_UNKNOWNHOST;
5323 addr->message = string_sprintf(
5324 rc == HOST_FIND_SECURITY
5325 ? "lookup of IP address for %s was insecure"
5326 : "failed to lookup IP address for %s",
5332 /* If the host is actually the local host, we may have a problem, or
5333 there may be some cunning configuration going on. In the problem case,
5334 log things and give up. The default transport status is already DEFER. */
5336 if (rc == HOST_FOUND_LOCAL && !ob->allow_localhost)
5338 for (address_item * addr = addrlist; addr; addr = addr->next)
5340 addr->basic_errno = ERRNO_HOST_IS_LOCAL;
5341 addr->message = string_sprintf("%s transport found host %s to be "
5342 "local", tblock->name, host->name);
5346 } /* End of block for IP address lookup */
5348 /* If this is a continued delivery, we are interested only in the host
5349 which matches the name of the existing open channel. The check is put
5350 here after the local host lookup, in case the name gets expanded as a
5351 result of the lookup. Set expired FALSE, to save the outer loop executing
5354 if (continue_hostname)
5355 if ( Ustrcmp(continue_hostname, host->name) != 0
5356 || Ustrcmp(continue_host_address, host->address) != 0
5360 continue; /* With next host */
5363 continue_host_tried = TRUE;
5365 /* Reset the default next host in case a multihomed host whose addresses
5366 are not looked up till just above added to the host list. */
5368 nexthost = host->next;
5370 /* If queue_smtp is set (-odqs or the first part of a 2-stage run), or the
5371 domain is in queue_smtp_domains, we don't actually want to attempt any
5372 deliveries. When doing a queue run, queue_smtp_domains is always unset. If
5373 there is a lookup defer in queue_smtp_domains, proceed as if the domain
5374 were not in it. We don't want to hold up all SMTP deliveries! Except when
5375 doing a two-stage queue run, don't do this if forcing. */
5377 if ( (!f.deliver_force || f.queue_2stage)
5379 || match_isinlist(addrlist->domain,
5380 CUSS &queue_smtp_domains, 0,
5381 &domainlist_anchor, NULL, MCL_DOMAIN, TRUE, NULL) == OK)
5384 DEBUG(D_transport) debug_printf("first-pass routing only\n");
5386 for (address_item * addr = addrlist; addr; addr = addr->next)
5387 if (addr->transport_return == DEFER)
5388 addr->message = US"first-pass only routing due to -odqs, "
5389 "queue_smtp_domains or control=queue";
5390 continue; /* With next host */
5393 /* Count hosts being considered - purely for an intelligent comment
5394 if none are usable. */
5398 /* Set $host and $host address now in case they are needed for the
5399 interface expansion or the serialize_hosts check; they remain set if an
5400 actual delivery happens. */
5402 deliver_host = host->name;
5403 deliver_host_address = host->address;
5404 lookup_dnssec_authenticated = host->dnssec == DS_YES ? US"yes"
5405 : host->dnssec == DS_NO ? US"no"
5408 /* Set up a string for adding to the retry key if the port number is not
5409 the standard SMTP port. A host may have its own port setting that overrides
5412 pistring = string_sprintf(":%d", host->port == PORT_NONE
5413 ? defport : host->port);
5414 if (Ustrcmp(pistring, ":25") == 0) pistring = US"";
5416 /* Select IPv4 or IPv6, and choose an outgoing interface. If the interface
5417 string is set, even if constant (as different transports can have different
5418 constant settings), we must add it to the key that is used for retries,
5419 because connections to the same host from a different interface should be
5420 treated separately. */
5422 host_af = Ustrchr(host->address, ':') ? AF_INET6 : AF_INET;
5424 uschar * s = ob->interface;
5427 if (!smtp_get_interface(s, host_af, addrlist, &interface, tid))
5429 pistring = string_sprintf("%s/%s", pistring, interface);
5433 /* The first time round the outer loop, check the status of the host by
5434 inspecting the retry data. The second time round, we are interested only
5435 in expired hosts that haven't been tried since this message arrived. */
5437 if (cutoff_retry == 0)
5440 /* Ensure the status of the address is set by checking retry data if
5441 necessary. There may be host-specific retry data (applicable to all
5442 messages) and also data for retries of a specific message at this host.
5443 If either of these retry records are actually read, the keys used are
5444 returned to save recomputing them later. */
5446 if (exp_bool(addrlist, US"transport", tblock->name, D_transport,
5447 US"retry_include_ip_address", ob->retry_include_ip_address,
5448 ob->expand_retry_include_ip_address, &incl_ip) != OK)
5449 continue; /* with next host */
5451 host_is_expired = retry_check_address(addrlist->domain, host, pistring,
5452 incl_ip, &retry_host_key, &retry_message_key);
5454 DEBUG(D_transport) debug_printf("%s [%s]%s retry-status = %s\n", host->name,
5455 host->address ? host->address : US"", pistring,
5456 host->status == hstatus_usable ? "usable"
5457 : host->status == hstatus_unusable ? "unusable"
5458 : host->status == hstatus_unusable_expired ? "unusable (expired)" : "?");
5460 /* Skip this address if not usable at this time, noting if it wasn't
5461 actually expired, both locally and in the address. */
5463 switch (host->status)
5465 case hstatus_unusable:
5467 setflag(addrlist, af_retry_skipped);
5470 case hstatus_unusable_expired:
5473 case hwhy_retry: hosts_retry++; break;
5474 case hwhy_failed: hosts_fail++; break;
5476 case hwhy_deferred: hosts_defer++; break;
5479 /* If there was a retry message key, implying that previously there
5480 was a message-specific defer, we don't want to update the list of
5481 messages waiting for these hosts. */
5483 if (retry_message_key) update_waiting = FALSE;
5484 continue; /* With the next host or IP address */
5488 /* Second time round the loop: if the address is set but expired, and
5489 the message is newer than the last try, let it through. */
5494 || host->status != hstatus_unusable_expired
5495 || host->last_try > received_time.tv_sec)
5497 DEBUG(D_transport) debug_printf("trying expired host %s [%s]%s\n",
5498 host->name, host->address, pistring);
5499 host_is_expired = TRUE;
5502 /* Setting "expired=FALSE" doesn't actually mean not all hosts are expired;
5503 it remains TRUE only if all hosts are expired and none are actually tried.
5508 /* If this host is listed as one to which access must be serialized,
5509 see if another Exim process has a connection to it, and if so, skip
5510 this host. If not, update the database to record our connection to it
5511 and remember this for later deletion. Do not do any of this if we are
5512 sending the message down a pre-existing connection. */
5514 if ( !continue_hostname
5515 && verify_check_given_host(CUSS &ob->serialize_hosts, host) == OK)
5517 serialize_key = string_sprintf("host-serialize-%s", host->name);
5518 if (!enq_start(serialize_key, 1))
5521 debug_printf("skipping host %s because another Exim process "
5522 "is connected to it\n", host->name);
5528 /* OK, we have an IP address that is not waiting for its retry time to
5529 arrive (it might be expired) OR (second time round the loop) we have an
5530 expired host that hasn't been tried since the message arrived. Have a go
5531 at delivering the message to it. First prepare the addresses by flushing
5532 out the result of previous attempts, and finding the first address that
5533 is still to be delivered. */
5535 first_addr = prepare_addresses(addrlist, host);
5537 DEBUG(D_transport) debug_printf("delivering %s to %s [%s] (%s%s)\n",
5538 message_id, host->name, host->address, addrlist->address,
5539 addrlist->next ? ", ..." : "");
5541 set_process_info("delivering %s to %s [%s]%s (%s%s)",
5542 message_id, host->name, host->address, pistring, addrlist->address,
5543 addrlist->next ? ", ..." : "");
5545 /* This is not for real; don't do the delivery. If there are
5546 any remaining hosts, list them. */
5551 gettimeofday(&now, NULL);
5552 set_errno_nohost(addrlist, 0, NULL, OK, FALSE, &now);
5553 for (address_item * addr = addrlist; addr; addr = addr->next)
5555 addr->host_used = host;
5556 addr->special_action = '*';
5557 addr->message = US"delivery bypassed by -N option";
5561 debug_printf("*** delivery by %s transport bypassed by -N option\n"
5562 "*** host and remaining hosts:\n", tblock->name);
5563 for (host_item * host2 = host; host2; host2 = host2->next)
5564 debug_printf(" %s [%s]\n", host2->name,
5565 host2->address ? host2->address : US"unset");
5570 /* This is for real. If the host is expired, we don't count it for
5571 hosts_max_retry. This ensures that all hosts must expire before an address
5572 is timed out, unless hosts_max_try_hardlimit (which protects against
5573 lunatic DNS configurations) is reached.
5575 If the host is not expired and we are about to hit the hosts_max_retry
5576 limit, check to see if there is a subsequent hosts with a different MX
5577 value. If so, make that the next host, and don't count this one. This is a
5578 heuristic to make sure that different MXs do get tried. With a normal kind
5579 of retry rule, they would get tried anyway when the earlier hosts were
5580 delayed, but if the domain has a "retry every time" type of rule - as is
5581 often used for the the very large ISPs, that won't happen. */
5586 /* Make a copy of the host if it is local to this invocation
5587 of the transport. */
5591 thost = store_get(sizeof(host_item), FALSE);
5593 thost->name = string_copy(host->name);
5594 thost->address = string_copy(host->address);
5599 if (!host_is_expired && ++unexpired_hosts_tried >= ob->hosts_max_try)
5602 debug_printf("hosts_max_try limit reached with this host\n");
5603 for (host_item * h = host; h; h = h->next) if (h->mx != host->mx)
5606 unexpired_hosts_tried--;
5607 DEBUG(D_transport) debug_printf("however, a higher MX host exists "
5608 "and will be tried\n");
5613 /* Attempt the delivery. */
5615 total_hosts_tried++;
5616 rc = smtp_deliver(addrlist, thost, host_af, defport, interface, tblock,
5617 &message_defer, FALSE);
5620 OK => connection made, each address contains its result;
5621 message_defer is set for message-specific defers (when all
5622 recipients are marked defer)
5623 DEFER => there was a non-message-specific delivery problem;
5624 ERROR => there was a problem setting up the arguments for a filter,
5625 or there was a problem with expanding added headers
5628 /* If the result is not OK, there was a non-message-specific problem.
5629 If the result is DEFER, we need to write to the logs saying what happened
5630 for this particular host, except in the case of authentication and TLS
5631 failures, where the log has already been written. If all hosts defer a
5632 general message is written at the end. */
5634 if (rc == DEFER && first_addr->basic_errno != ERRNO_AUTHFAIL
5635 && first_addr->basic_errno != ERRNO_TLSFAILURE)
5636 write_logs(host, first_addr->message, first_addr->basic_errno);
5638 #ifndef DISABLE_EVENT
5640 deferred_event_raise(first_addr, host, US"msg:host:defer");
5643 /* If STARTTLS was accepted, but there was a failure in setting up the
5644 TLS session (usually a certificate screwup), and the host is not in
5645 hosts_require_tls, and tls_tempfail_tryclear is true, try again, with
5646 TLS forcibly turned off. We have to start from scratch with a new SMTP
5647 connection. That's why the retry is done from here, not from within
5648 smtp_deliver(). [Rejections of STARTTLS itself don't screw up the
5649 session, so the in-clear transmission after those errors, if permitted,
5650 happens inside smtp_deliver().] */
5654 && first_addr->basic_errno == ERRNO_TLSFAILURE
5655 && ob->tls_tempfail_tryclear
5656 && verify_check_given_host(CUSS &ob->hosts_require_tls, host) != OK
5659 log_write(0, LOG_MAIN,
5660 "%s: delivering unencrypted to H=%s [%s] (not in hosts_require_tls)",
5661 first_addr->message, host->name, host->address);
5662 first_addr = prepare_addresses(addrlist, host);
5663 rc = smtp_deliver(addrlist, thost, host_af, defport, interface, tblock,
5664 &message_defer, TRUE);
5665 if (rc == DEFER && first_addr->basic_errno != ERRNO_AUTHFAIL)
5666 write_logs(host, first_addr->message, first_addr->basic_errno);
5667 # ifndef DISABLE_EVENT
5669 deferred_event_raise(first_addr, host, US"msg:host:defer");
5672 #endif /*DISABLE_TLS*/
5674 #ifndef DISABLE_EVENT
5675 /* If the last host gave a defer raise a per-message event */
5678 && unexpired_hosts_tried < ob->hosts_max_try
5679 && total_hosts_tried < ob->hosts_max_try_hardlimit
5681 && (message_defer || rc == DEFER)
5683 deferred_event_raise(first_addr, host, US"msg:defer");
5687 /* Delivery attempt finished */
5689 set_process_info("delivering %s: just tried %s [%s]%s for %s%s: result %s",
5690 message_id, host->name, host->address, pistring, addrlist->address,
5691 addrlist->next ? " (& others)" : "", rc_to_string(rc));
5693 /* Release serialization if set up */
5695 if (serialize_key) enq_end(serialize_key);
5697 /* If the result is DEFER, or if a host retry record is known to exist, we
5698 need to add an item to the retry chain for updating the retry database
5699 at the end of delivery. We only need to add the item to the top address,
5700 of course. Also, if DEFER, we mark the IP address unusable so as to skip it
5701 for any other delivery attempts using the same address. (It is copied into
5702 the unusable tree at the outer level, so even if different address blocks
5703 contain the same address, it still won't get tried again.) */
5705 if (rc == DEFER || retry_host_key)
5707 int delete_flag = rc != DEFER ? rf_delete : 0;
5708 if (!retry_host_key)
5711 if (exp_bool(addrlist, US"transport", tblock->name, D_transport,
5712 US"retry_include_ip_address", ob->retry_include_ip_address,
5713 ob->expand_retry_include_ip_address, &incl_ip) != OK)
5714 incl_ip = TRUE; /* error; use most-specific retry record */
5716 retry_host_key = incl_ip
5717 ? string_sprintf("T:%S:%s%s", host->name, host->address, pistring)
5718 : string_sprintf("T:%S%s", host->name, pistring);
5721 /* If a delivery of another message over an existing SMTP connection
5722 yields DEFER, we do NOT set up retry data for the host. This covers the
5723 case when there are delays in routing the addresses in the second message
5724 that are so long that the server times out. This is alleviated by not
5725 routing addresses that previously had routing defers when handling an
5726 existing connection, but even so, this case may occur (e.g. if a
5727 previously happily routed address starts giving routing defers). If the
5728 host is genuinely down, another non-continued message delivery will
5729 notice it soon enough. */
5731 if (delete_flag != 0 || !continue_hostname)
5732 retry_add_item(first_addr, retry_host_key, rf_host | delete_flag);
5734 /* We may have tried an expired host, if its retry time has come; ensure
5735 the status reflects the expiry for the benefit of any other addresses. */
5739 host->status = host_is_expired
5740 ? hstatus_unusable_expired : hstatus_unusable;
5741 host->why = hwhy_deferred;
5745 /* If message_defer is set (host was OK, but every recipient got deferred
5746 because of some message-specific problem), or if that had happened
5747 previously so that a message retry key exists, add an appropriate item
5748 to the retry chain. Note that if there was a message defer but now there is
5749 a host defer, the message defer record gets deleted. That seems perfectly
5750 reasonable. Also, stop the message from being remembered as waiting
5751 for specific hosts. */
5753 if (message_defer || retry_message_key)
5755 int delete_flag = message_defer ? 0 : rf_delete;
5756 if (!retry_message_key)
5759 if (exp_bool(addrlist, US"transport", tblock->name, D_transport,
5760 US"retry_include_ip_address", ob->retry_include_ip_address,
5761 ob->expand_retry_include_ip_address, &incl_ip) != OK)
5762 incl_ip = TRUE; /* error; use most-specific retry record */
5764 retry_message_key = incl_ip
5765 ? string_sprintf("T:%S:%s%s:%s", host->name, host->address, pistring,
5767 : string_sprintf("T:%S%s:%s", host->name, pistring, message_id);
5769 retry_add_item(addrlist, retry_message_key,
5770 rf_message | rf_host | delete_flag);
5771 update_waiting = FALSE;
5774 /* Any return other than DEFER (that is, OK or ERROR) means that the
5775 addresses have got their final statuses filled in for this host. In the OK
5776 case, see if any of them are deferred. */
5779 for (address_item * addr = addrlist; addr; addr = addr->next)
5780 if (addr->transport_return == DEFER)
5782 some_deferred = TRUE;
5786 /* If no addresses deferred or the result was ERROR, return. We do this for
5787 ERROR because a failing filter set-up or add_headers expansion is likely to
5788 fail for any host we try. */
5790 if (rc == ERROR || (rc == OK && !some_deferred))
5792 DEBUG(D_transport) debug_printf("Leaving %s transport\n", tblock->name);
5793 return TRUE; /* Each address has its status */
5796 /* If the result was DEFER or some individual addresses deferred, let
5797 the loop run to try other hosts with the deferred addresses, except for the
5798 case when we were trying to deliver down an existing channel and failed.
5799 Don't try any other hosts in this case. */
5801 if (continue_hostname) break;
5803 /* If the whole delivery, or some individual addresses, were deferred and
5804 there are more hosts that could be tried, do not count this host towards
5805 the hosts_max_try limit if the age of the message is greater than the
5806 maximum retry time for this host. This means we may try try all hosts,
5807 ignoring the limit, when messages have been around for some time. This is
5808 important because if we don't try all hosts, the address will never time
5809 out. NOTE: this does not apply to hosts_max_try_hardlimit. */
5811 if ((rc == DEFER || some_deferred) && nexthost)
5814 retry_config *retry = retry_find_config(host->name, NULL, 0, 0);
5816 if (retry && retry->rules)
5818 retry_rule *last_rule;
5819 for (last_rule = retry->rules;
5821 last_rule = last_rule->next);
5822 timedout = time(NULL) - received_time.tv_sec > last_rule->timeout;
5824 else timedout = TRUE; /* No rule => timed out */
5828 unexpired_hosts_tried--;
5829 DEBUG(D_transport) debug_printf("temporary delivery error(s) override "
5830 "hosts_max_try (message older than host's retry time)\n");
5836 if (unexpired_hosts_tried >= ob->hosts_max_try)
5837 debug_printf("reached transport hosts_max_try limit %d\n",
5839 if (total_hosts_tried >= ob->hosts_max_try_hardlimit)
5840 debug_printf("reached transport hosts_max_try_hardlimit limit %d\n",
5841 ob->hosts_max_try_hardlimit);
5844 testharness_pause_ms(500); /* let server debug out */
5845 } /* End of loop for trying multiple hosts. */
5847 /* If we failed to find a matching host in the list, for an already-open
5848 connection, just close it and start over with the list. This can happen
5849 for routing that changes from run to run, or big multi-IP sites with
5852 if (continue_hostname && !continue_host_tried)
5854 int fd = cutthrough.cctx.sock >= 0 ? cutthrough.cctx.sock : 0;
5856 DEBUG(D_transport) debug_printf("no hosts match already-open connection\n");
5858 /* A TLS conn could be open for a cutthrough, but not for a plain continued-
5860 /*XXX doublecheck that! */
5862 if (cutthrough.cctx.sock >= 0 && cutthrough.is_tls)
5864 (void) tls_write(cutthrough.cctx.tls_ctx, US"QUIT\r\n", 6, FALSE);
5865 tls_close(cutthrough.cctx.tls_ctx, TLS_SHUTDOWN_NOWAIT);
5866 cutthrough.cctx.tls_ctx = NULL;
5867 cutthrough.is_tls = FALSE;
5871 (void) write(fd, US"QUIT\r\n", 6);
5874 cutthrough.cctx.sock = -1;
5875 continue_hostname = NULL;
5876 goto retry_non_continued;
5879 /* This is the end of the loop that repeats iff expired is TRUE and
5880 ob->delay_after_cutoff is FALSE. The second time round we will
5881 try those hosts that haven't been tried since the message arrived. */
5885 debug_printf("all IP addresses skipped or deferred at least one address\n");
5886 if (expired && !ob->delay_after_cutoff && cutoff_retry == 0)
5887 debug_printf("retrying IP addresses not tried since message arrived\n");
5892 /* Get here if all IP addresses are skipped or defer at least one address. In
5893 MUA wrapper mode, this will happen only for connection or other non-message-
5894 specific failures. Force the delivery status for all addresses to FAIL. */
5898 for (address_item * addr = addrlist; addr; addr = addr->next)
5899 addr->transport_return = FAIL;
5903 /* In the normal, non-wrapper case, add a standard message to each deferred
5904 address if there hasn't been an error, that is, if it hasn't actually been
5905 tried this time. The variable "expired" will be FALSE if any deliveries were
5906 actually tried, or if there was at least one host that was not expired. That
5907 is, it is TRUE only if no deliveries were tried and all hosts were expired. If
5908 a delivery has been tried, an error code will be set, and the failing of the
5909 message is handled by the retry code later.
5911 If queue_smtp is set, or this transport was called to send a subsequent message
5912 down an existing TCP/IP connection, and something caused the host not to be
5913 found, we end up here, but can detect these cases and handle them specially. */
5915 for (address_item * addr = addrlist; addr; addr = addr->next)
5917 /* If host is not NULL, it means that we stopped processing the host list
5918 because of hosts_max_try or hosts_max_try_hardlimit. In the former case, this
5919 means we need to behave as if some hosts were skipped because their retry
5920 time had not come. Specifically, this prevents the address from timing out.
5921 However, if we have hit hosts_max_try_hardlimit, we want to behave as if all
5922 hosts were tried. */
5925 if (total_hosts_tried >= ob->hosts_max_try_hardlimit)
5928 debug_printf("hosts_max_try_hardlimit reached: behave as if all "
5929 "hosts were tried\n");
5934 debug_printf("hosts_max_try limit caused some hosts to be skipped\n");
5935 setflag(addr, af_retry_skipped);
5938 if (f.queue_smtp) /* no deliveries attempted */
5940 addr->transport_return = DEFER;
5941 addr->basic_errno = 0;
5942 addr->message = US"SMTP delivery explicitly queued";
5945 else if ( addr->transport_return == DEFER
5946 && (addr->basic_errno == ERRNO_UNKNOWNERROR || addr->basic_errno == 0)
5950 addr->basic_errno = ERRNO_HRETRY;
5951 if (continue_hostname)
5952 addr->message = US"no host found for existing SMTP connection";
5955 setflag(addr, af_pass_message); /* This is not a security risk */
5956 addr->message = string_sprintf(
5957 "all hosts%s have been failing for a long time %s",
5958 addr->domain ? string_sprintf(" for '%s'", addr->domain) : US"",
5959 ob->delay_after_cutoff
5960 ? US"(and retry time not reached)"
5961 : US"and were last tried after this message arrived");
5963 /* If we are already using fallback hosts, or there are no fallback hosts
5964 defined, convert the result to FAIL to cause a bounce. */
5966 if (addr->host_list == addr->fallback_hosts || !addr->fallback_hosts)
5967 addr->transport_return = FAIL;
5972 if (hosts_retry == hosts_total)
5973 s = "retry time not reached for any host%s";
5974 else if (hosts_fail == hosts_total)
5975 s = "all host address lookups%s failed permanently";
5976 else if (hosts_defer == hosts_total)
5977 s = "all host address lookups%s failed temporarily";
5978 else if (hosts_serial == hosts_total)
5979 s = "connection limit reached for all hosts%s";
5980 else if (hosts_fail+hosts_defer == hosts_total)
5981 s = "all host address lookups%s failed";
5983 s = "some host address lookups failed and retry time "
5984 "not reached for other hosts or connection limit reached%s";
5986 addr->message = string_sprintf(s,
5987 addr->domain ? string_sprintf(" for '%s'", addr->domain) : US"");
5992 /* Update the database which keeps information about which messages are waiting
5993 for which hosts to become available. For some message-specific errors, the
5994 update_waiting flag is turned off because we don't want follow-on deliveries in
5995 those cases. If this transport instance is explicitly limited to one message
5996 per connection then follow-on deliveries are not possible and there's no need
5997 to create/update the per-transport wait-<transport_name> database. */
5999 if (update_waiting && tblock->connection_max_messages != 1)
6000 transport_update_waiting(hostlist, tblock->name);
6004 DEBUG(D_transport) debug_printf("Leaving %s transport\n", tblock->name);
6006 return TRUE; /* Each address has its status */
6009 #endif /*!MACRO_PREDEF*/
6012 /* End of transport/smtp.c */