1 /*************************************************
2 * Exim - an Internet mail transport agent *
3 *************************************************/
5 /* Copyright (c) University of Cambridge 1995 - 2018 */
6 /* Copyright (c) The Exim Maintainers 2020 - 2021 */
7 /* See the file NOTICE for conditions of use and distribution. */
12 #if defined(SUPPORT_DANE) && defined(DISABLE_TLS)
13 # error TLS is required for DANE
17 /* Options specific to the smtp transport. This transport also supports LMTP
18 over TCP/IP. The options must be in alphabetic order (note that "_" comes
19 before the lower case letters). Some live in the transport_instance block so as
20 to be publicly visible; these are flagged with opt_public. */
22 #define LOFF(field) OPT_OFF(smtp_transport_options_block, field)
24 optionlist smtp_transport_options[] = {
25 { "*expand_multi_domain", opt_stringptr | opt_hidden | opt_public,
26 OPT_OFF(transport_instance, expand_multi_domain) },
27 { "*expand_retry_include_ip_address", opt_stringptr | opt_hidden,
28 LOFF(expand_retry_include_ip_address) },
30 { "address_retry_include_sender", opt_bool,
31 LOFF(address_retry_include_sender) },
32 { "allow_localhost", opt_bool, LOFF(allow_localhost) },
33 #ifdef EXPERIMENTAL_ARC
34 { "arc_sign", opt_stringptr, LOFF(arc_sign) },
36 { "authenticated_sender", opt_stringptr, LOFF(authenticated_sender) },
37 { "authenticated_sender_force", opt_bool, LOFF(authenticated_sender_force) },
38 { "command_timeout", opt_time, LOFF(command_timeout) },
39 { "connect_timeout", opt_time, LOFF(connect_timeout) },
40 { "connection_max_messages", opt_int | opt_public,
41 OPT_OFF(transport_instance, connection_max_messages) },
43 { "dane_require_tls_ciphers", opt_stringptr, LOFF(dane_require_tls_ciphers) },
45 { "data_timeout", opt_time, LOFF(data_timeout) },
46 { "delay_after_cutoff", opt_bool, LOFF(delay_after_cutoff) },
48 { "dkim_canon", opt_stringptr, LOFF(dkim.dkim_canon) },
49 { "dkim_domain", opt_stringptr, LOFF(dkim.dkim_domain) },
50 { "dkim_hash", opt_stringptr, LOFF(dkim.dkim_hash) },
51 { "dkim_identity", opt_stringptr, LOFF(dkim.dkim_identity) },
52 { "dkim_private_key", opt_stringptr, LOFF(dkim.dkim_private_key) },
53 { "dkim_selector", opt_stringptr, LOFF(dkim.dkim_selector) },
54 { "dkim_sign_headers", opt_stringptr, LOFF(dkim.dkim_sign_headers) },
55 { "dkim_strict", opt_stringptr, LOFF(dkim.dkim_strict) },
56 { "dkim_timestamps", opt_stringptr, LOFF(dkim.dkim_timestamps) },
58 { "dns_qualify_single", opt_bool, LOFF(dns_qualify_single) },
59 { "dns_search_parents", opt_bool, LOFF(dns_search_parents) },
60 { "dnssec_request_domains", opt_stringptr, LOFF(dnssec.request) },
61 { "dnssec_require_domains", opt_stringptr, LOFF(dnssec.require) },
62 { "dscp", opt_stringptr, LOFF(dscp) },
63 { "fallback_hosts", opt_stringptr, LOFF(fallback_hosts) },
64 { "final_timeout", opt_time, LOFF(final_timeout) },
65 { "gethostbyname", opt_bool, LOFF(gethostbyname) },
66 { "helo_data", opt_stringptr, LOFF(helo_data) },
67 { "hosts", opt_stringptr, LOFF(hosts) },
68 { "hosts_avoid_esmtp", opt_stringptr, LOFF(hosts_avoid_esmtp) },
69 { "hosts_avoid_pipelining", opt_stringptr, LOFF(hosts_avoid_pipelining) },
71 { "hosts_avoid_tls", opt_stringptr, LOFF(hosts_avoid_tls) },
73 { "hosts_max_try", opt_int, LOFF(hosts_max_try) },
74 { "hosts_max_try_hardlimit", opt_int, LOFF(hosts_max_try_hardlimit) },
76 { "hosts_nopass_tls", opt_stringptr, LOFF(hosts_nopass_tls) },
77 { "hosts_noproxy_tls", opt_stringptr, LOFF(hosts_noproxy_tls) },
79 { "hosts_override", opt_bool, LOFF(hosts_override) },
80 #ifndef DISABLE_PIPE_CONNECT
81 { "hosts_pipe_connect", opt_stringptr, LOFF(hosts_pipe_connect) },
83 { "hosts_randomize", opt_bool, LOFF(hosts_randomize) },
84 #if !defined(DISABLE_TLS) && !defined(DISABLE_OCSP)
85 { "hosts_request_ocsp", opt_stringptr, LOFF(hosts_request_ocsp) },
87 { "hosts_require_alpn", opt_stringptr, LOFF(hosts_require_alpn) },
88 { "hosts_require_auth", opt_stringptr, LOFF(hosts_require_auth) },
91 { "hosts_require_dane", opt_stringptr, LOFF(hosts_require_dane) },
94 { "hosts_require_ocsp", opt_stringptr, LOFF(hosts_require_ocsp) },
96 { "hosts_require_tls", opt_stringptr, LOFF(hosts_require_tls) },
98 { "hosts_try_auth", opt_stringptr, LOFF(hosts_try_auth) },
99 { "hosts_try_chunking", opt_stringptr, LOFF(hosts_try_chunking) },
101 { "hosts_try_dane", opt_stringptr, LOFF(hosts_try_dane) },
103 { "hosts_try_fastopen", opt_stringptr, LOFF(hosts_try_fastopen) },
105 { "hosts_try_prdr", opt_stringptr, LOFF(hosts_try_prdr) },
108 { "hosts_verify_avoid_tls", opt_stringptr, LOFF(hosts_verify_avoid_tls) },
110 { "interface", opt_stringptr, LOFF(interface) },
111 { "keepalive", opt_bool, LOFF(keepalive) },
112 { "lmtp_ignore_quota", opt_bool, LOFF(lmtp_ignore_quota) },
113 { "max_rcpt", opt_int | opt_public,
114 OPT_OFF(transport_instance, max_addresses) },
115 { "message_linelength_limit", opt_int, LOFF(message_linelength_limit) },
116 { "multi_domain", opt_expand_bool | opt_public,
117 OPT_OFF(transport_instance, multi_domain) },
118 { "port", opt_stringptr, LOFF(port) },
119 { "protocol", opt_stringptr, LOFF(protocol) },
120 { "retry_include_ip_address", opt_expand_bool, LOFF(retry_include_ip_address) },
121 { "serialize_hosts", opt_stringptr, LOFF(serialize_hosts) },
122 { "size_addition", opt_int, LOFF(size_addition) },
124 { "socks_proxy", opt_stringptr, LOFF(socks_proxy) },
127 { "tls_alpn", opt_stringptr, LOFF(tls_alpn) },
128 { "tls_certificate", opt_stringptr, LOFF(tls_certificate) },
129 { "tls_crl", opt_stringptr, LOFF(tls_crl) },
130 { "tls_dh_min_bits", opt_int, LOFF(tls_dh_min_bits) },
131 { "tls_privatekey", opt_stringptr, LOFF(tls_privatekey) },
132 { "tls_require_ciphers", opt_stringptr, LOFF(tls_require_ciphers) },
133 # ifndef DISABLE_TLS_RESUME
134 { "tls_resumption_hosts", opt_stringptr, LOFF(tls_resumption_hosts) },
136 { "tls_sni", opt_stringptr, LOFF(tls_sni) },
137 { "tls_tempfail_tryclear", opt_bool, LOFF(tls_tempfail_tryclear) },
138 { "tls_try_verify_hosts", opt_stringptr, LOFF(tls_try_verify_hosts) },
139 { "tls_verify_cert_hostnames", opt_stringptr, LOFF(tls_verify_cert_hostnames)},
140 { "tls_verify_certificates", opt_stringptr, LOFF(tls_verify_certificates) },
141 { "tls_verify_hosts", opt_stringptr, LOFF(tls_verify_hosts) },
144 { "utf8_downconvert", opt_stringptr, LOFF(utf8_downconvert) },
148 /* Size of the options list. An extern variable has to be used so that its
149 address can appear in the tables drtables.c. */
151 int smtp_transport_options_count = nelem(smtp_transport_options);
157 smtp_transport_options_block smtp_transport_option_defaults = {0};
158 void smtp_transport_init(transport_instance *tblock) {}
159 BOOL smtp_transport_entry(transport_instance *tblock, address_item *addr) {return FALSE;}
160 void smtp_transport_closedown(transport_instance *tblock) {}
162 #else /*!MACRO_PREDEF*/
165 /* Default private options block for the smtp transport. */
167 smtp_transport_options_block smtp_transport_option_defaults = {
168 /* All non-mentioned elements 0/NULL/FALSE */
169 .helo_data = US"$primary_hostname",
170 .protocol = US"smtp",
171 .hosts_try_chunking = US"*",
173 .hosts_try_dane = US"*",
175 .hosts_try_fastopen = US"*",
177 .hosts_try_prdr = US"*",
180 .hosts_request_ocsp = US"*", /* hosts_request_ocsp (except under DANE; tls_client_start()) */
182 .command_timeout = 5*60,
183 .connect_timeout = 5*60,
184 .data_timeout = 5*60,
185 .final_timeout = 10*60,
186 .size_addition = 1024,
188 .hosts_max_try_hardlimit = 50,
189 .message_linelength_limit = 998,
190 .address_retry_include_sender = TRUE,
191 .dns_qualify_single = TRUE,
192 .dnssec = { .request= US"*", .require=NULL },
193 .delay_after_cutoff = TRUE,
195 .retry_include_ip_address = TRUE,
197 .tls_verify_certificates = US"system",
198 .tls_dh_min_bits = EXIM_CLIENT_DH_DEFAULT_MIN_BITS,
199 .tls_tempfail_tryclear = TRUE,
200 .tls_try_verify_hosts = US"*",
201 .tls_verify_cert_hostnames = US"*",
204 .utf8_downconvert = US"-1",
208 { .dkim_hash = US"sha256", },
212 /* some DSN flags for use later */
214 static int rf_list[] = {rf_notify_never, rf_notify_success,
215 rf_notify_failure, rf_notify_delay };
217 static uschar *rf_names[] = { US"NEVER", US"SUCCESS", US"FAILURE", US"DELAY" };
223 static uschar *smtp_command; /* Points to last cmd for error messages */
224 static uschar *mail_command; /* Points to MAIL cmd for error messages */
225 static uschar *data_command = US""; /* Points to DATA cmd for error messages */
226 static BOOL update_waiting; /* TRUE to update the "wait" database */
228 /*XXX move to smtp_context */
229 static BOOL pipelining_active; /* current transaction is in pipe mode */
232 static unsigned ehlo_response(uschar * buf, unsigned checks);
235 /******************************************************************************/
238 smtp_deliver_init(void)
242 const pcre2_code ** re;
243 const uschar * string;
246 { ®ex_AUTH, AUTHS_REGEX },
247 { ®ex_CHUNKING, US"\\n250[\\s\\-]CHUNKING(\\s|\\n|$)" },
248 { ®ex_DSN, US"\\n250[\\s\\-]DSN(\\s|\\n|$)" },
249 { ®ex_IGNOREQUOTA, US"\\n250[\\s\\-]IGNOREQUOTA(\\s|\\n|$)" },
250 { ®ex_PIPELINING, US"\\n250[\\s\\-]PIPELINING(\\s|\\n|$)" },
251 { ®ex_SIZE, US"\\n250[\\s\\-]SIZE(\\s|\\n|$)" },
254 { ®ex_STARTTLS, US"\\n250[\\s\\-]STARTTLS(\\s|\\n|$)" },
257 { ®ex_PRDR, US"\\n250[\\s\\-]PRDR(\\s|\\n|$)" },
260 { ®ex_UTF8, US"\\n250[\\s\\-]SMTPUTF8(\\s|\\n|$)" },
262 #ifndef DISABLE_PIPE_CONNECT
263 { ®ex_EARLY_PIPE, US"\\n250[\\s\\-]" EARLY_PIPE_FEATURE_NAME "(\\s|\\n|$)" },
265 #ifdef EXPERIMENTAL_ESMTP_LIMITS
266 { ®ex_LIMITS, US"\\n250[\\s\\-]LIMITS\\s" },
270 for (struct list * l = list; l < list + nelem(list); l++)
272 *l->re = regex_must_compile(l->string, FALSE, TRUE);
276 /*************************************************
277 * Setup entry point *
278 *************************************************/
280 /* This function is called when the transport is about to be used,
281 but before running it in a sub-process. It is used for two things:
283 (1) To set the fallback host list in addresses, when delivering.
284 (2) To pass back the interface, port, protocol, and other options, for use
285 during callout verification.
288 tblock pointer to the transport instance block
289 addrlist list of addresses about to be transported
290 tf if not NULL, pointer to block in which to return options
291 uid the uid that will be set (not used)
292 gid the gid that will be set (not used)
293 errmsg place for error message (not used)
295 Returns: OK always (FAIL, DEFER not used)
299 smtp_transport_setup(transport_instance *tblock, address_item *addrlist,
300 transport_feedback *tf, uid_t uid, gid_t gid, uschar **errmsg)
302 smtp_transport_options_block *ob = SOB tblock->options_block;
304 /* Pass back options if required. This interface is getting very messy. */
308 tf->interface = ob->interface;
310 tf->protocol = ob->protocol;
311 tf->hosts = ob->hosts;
312 tf->hosts_override = ob->hosts_override;
313 tf->hosts_randomize = ob->hosts_randomize;
314 tf->gethostbyname = ob->gethostbyname;
315 tf->qualify_single = ob->dns_qualify_single;
316 tf->search_parents = ob->dns_search_parents;
317 tf->helo_data = ob->helo_data;
320 /* Set the fallback host list for all the addresses that don't have fallback
321 host lists, provided that the local host wasn't present in the original host
324 if (!testflag(addrlist, af_local_host_removed))
325 for (; addrlist; addrlist = addrlist->next)
326 if (!addrlist->fallback_hosts) addrlist->fallback_hosts = ob->fallback_hostlist;
333 /*************************************************
334 * Initialization entry point *
335 *************************************************/
337 /* Called for each instance, after its options have been read, to
338 enable consistency checks to be done, or anything else that needs
341 Argument: pointer to the transport instance block
346 smtp_transport_init(transport_instance *tblock)
348 smtp_transport_options_block *ob = SOB tblock->options_block;
349 int old_pool = store_pool;
351 /* Retry_use_local_part defaults FALSE if unset */
353 if (tblock->retry_use_local_part == TRUE_UNSET)
354 tblock->retry_use_local_part = FALSE;
356 /* Set the default port according to the protocol */
359 ob->port = strcmpic(ob->protocol, US"lmtp") == 0
361 : strcmpic(ob->protocol, US"smtps") == 0
362 ? US"smtps" : US"smtp";
364 /* Set up the setup entry point, to be called before subprocesses for this
367 tblock->setup = smtp_transport_setup;
369 /* Complain if any of the timeouts are zero. */
371 if (ob->command_timeout <= 0 || ob->data_timeout <= 0 ||
372 ob->final_timeout <= 0)
373 log_write(0, LOG_PANIC_DIE|LOG_CONFIG,
374 "command, data, or final timeout value is zero for %s transport",
377 /* If hosts_override is set and there are local hosts, set the global
378 flag that stops verify from showing router hosts. */
380 if (ob->hosts_override && ob->hosts) tblock->overrides_hosts = TRUE;
382 /* If there are any fallback hosts listed, build a chain of host items
383 for them, but do not do any lookups at this time. */
385 store_pool = POOL_PERM;
386 host_build_hostlist(&ob->fallback_hostlist, ob->fallback_hosts, FALSE);
387 store_pool = old_pool;
394 /*************************************************
395 * Set delivery info into all active addresses *
396 *************************************************/
398 /* Only addresses whose status is >= PENDING are relevant. A lesser
399 status means that an address is not currently being processed.
402 addrlist points to a chain of addresses
403 errno_value to put in each address's errno field
404 msg to put in each address's message field
405 rc to put in each address's transport_return field
406 pass_message if TRUE, set the "pass message" flag in the address
407 host if set, mark addrs as having used this host
408 smtp_greeting from peer
409 helo_response from peer
410 start points to timestamp of delivery start
412 If errno_value has the special value ERRNO_CONNECTTIMEOUT, ETIMEDOUT is put in
413 the errno field, and RTEF_CTOUT is ORed into the more_errno field, to indicate
414 this particular type of timeout.
420 set_errno(address_item *addrlist, int errno_value, uschar *msg, int rc,
421 BOOL pass_message, host_item * host,
422 #ifdef EXPERIMENTAL_DSN_INFO
423 const uschar * smtp_greeting, const uschar * helo_response,
425 struct timeval * start
429 struct timeval deliver_time;
431 if (errno_value == ERRNO_CONNECTTIMEOUT)
433 errno_value = ETIMEDOUT;
434 orvalue = RTEF_CTOUT;
436 timesince(&deliver_time, start);
438 for (address_item * addr = addrlist; addr; addr = addr->next)
439 if (addr->transport_return >= PENDING)
441 addr->basic_errno = errno_value;
442 addr->more_errno |= orvalue;
443 addr->delivery_time = deliver_time;
447 if (pass_message) setflag(addr, af_pass_message);
449 addr->transport_return = rc;
452 addr->host_used = host;
453 #ifdef EXPERIMENTAL_DSN_INFO
455 {uschar * s = Ustrchr(smtp_greeting, '\n'); if (s) *s = '\0';}
456 addr->smtp_greeting = smtp_greeting;
459 {uschar * s = Ustrchr(helo_response, '\n'); if (s) *s = '\0';}
460 addr->helo_response = helo_response;
467 set_errno_nohost(address_item * addrlist, int errno_value, uschar * msg, int rc,
468 BOOL pass_message, struct timeval * start)
470 set_errno(addrlist, errno_value, msg, rc, pass_message, NULL,
471 #ifdef EXPERIMENTAL_DSN_INFO
478 /*************************************************
479 * Check an SMTP response *
480 *************************************************/
482 /* This function is given an errno code and the SMTP response buffer
483 to analyse, together with the host identification for generating messages. It
484 sets an appropriate message and puts the first digit of the response code into
485 the yield variable. If no response was actually read, a suitable digit is
489 host the current host, to get its name for messages
490 errno_value pointer to the errno value
491 more_errno from the top address for use with ERRNO_FILTER_FAIL
492 buffer the SMTP response buffer
493 yield where to put a one-digit SMTP response code
494 message where to put an error message
495 pass_message set TRUE if message is an SMTP response
497 Returns: TRUE if an SMTP "QUIT" command should be sent, else FALSE
501 check_response(host_item *host, int *errno_value, int more_errno,
502 uschar *buffer, int *yield, uschar **message, BOOL *pass_message)
504 uschar * pl = pipelining_active ? US"pipelined " : US"";
507 *yield = '4'; /* Default setting is to give a temporary error */
511 case ETIMEDOUT: /* Handle response timeout */
512 *message = US string_sprintf("SMTP timeout after %s%s",
514 if (transport_count > 0)
515 *message = US string_sprintf("%s (%d bytes written)", *message,
519 case ERRNO_SMTPFORMAT: /* Handle malformed SMTP response */
520 s = string_printing(buffer);
521 while (isspace(*s)) s++;
523 ? string_sprintf("Malformed SMTP reply (an empty line) "
524 "in response to %s%s", pl, smtp_command)
525 : string_sprintf("Malformed SMTP reply in response to %s%s: %s",
526 pl, smtp_command, s);
529 case ERRNO_TLSFAILURE: /* Handle bad first read; can happen with
531 *message = US"bad first read from TLS conn";
534 case ERRNO_FILTER_FAIL: /* Handle a failed filter process error;
535 can't send QUIT as we mustn't end the DATA. */
536 *message = string_sprintf("transport filter process failed (%d)%s",
538 more_errno == EX_EXECFAILED ? ": unable to execute command" : "");
541 case ERRNO_CHHEADER_FAIL: /* Handle a failed add_headers expansion;
542 can't send QUIT as we mustn't end the DATA. */
544 string_sprintf("failed to expand headers_add or headers_remove: %s",
545 expand_string_message);
548 case ERRNO_WRITEINCOMPLETE: /* failure to write a complete data block */
549 *message = US"failed to write a data block";
553 case ERRNO_UTF8_FWD: /* no advertised SMTPUTF8, for international message */
554 *message = US"utf8 support required but not offered for forwarding";
555 DEBUG(D_deliver|D_transport) debug_printf("%s\n", *message);
560 /* Handle error responses from the remote mailer. */
564 *message = string_sprintf("SMTP error from remote mail server after %s%s: "
565 "%s", pl, smtp_command, s = string_printing(buffer));
566 *pass_message = TRUE;
571 /* No data was read. If there is no errno, this must be the EOF (i.e.
572 connection closed) case, which causes deferral. An explicit connection reset
573 error has the same effect. Otherwise, put the host's identity in the message,
574 leaving the errno value to be interpreted as well. In all cases, we have to
575 assume the connection is now dead. */
577 if (*errno_value == 0 || *errno_value == ECONNRESET)
579 *errno_value = ERRNO_SMTPCLOSED;
580 *message = US string_sprintf("Remote host closed connection "
581 "in response to %s%s", pl, smtp_command);
584 *message = US string_sprintf("%s [%s]", host->name, host->address);
591 /*************************************************
592 * Write error message to logs *
593 *************************************************/
595 /* This writes to the main log and to the message log.
598 host the current host
599 detail the current message (addr_item->message)
600 basic_errno the errno (addr_item->basic_errno)
606 write_logs(const host_item *host, const uschar *suffix, int basic_errno)
608 gstring * message = LOGGING(outgoing_port)
609 ? string_fmt_append(NULL, "H=%s [%s]:%d", host->name, host->address,
610 host->port == PORT_NONE ? 25 : host->port)
611 : string_fmt_append(NULL, "H=%s [%s]", host->name, host->address);
615 message = string_fmt_append(message, ": %s", suffix);
617 message = string_fmt_append(message, ": %s", strerror(basic_errno));
620 message = string_fmt_append(message, " %s", exim_errstr(basic_errno));
622 log_write(0, LOG_MAIN, "%s", string_from_gstring(message));
623 deliver_msglog("%s %s\n", tod_stamp(tod_log), message->s);
627 msglog_line(host_item * host, uschar * message)
629 deliver_msglog("%s H=%s [%s] %s\n", tod_stamp(tod_log),
630 host->name, host->address, message);
635 #ifndef DISABLE_EVENT
636 /*************************************************
637 * Post-defer action *
638 *************************************************/
640 /* This expands an arbitrary per-transport string.
641 It might, for example, be used to write to the database log.
644 addr the address item containing error information
645 host the current host
652 deferred_event_raise(address_item * addr, host_item * host, uschar * evstr)
654 uschar * action = addr->transport->event_action;
655 const uschar * save_domain;
661 save_domain = deliver_domain;
662 save_local = deliver_localpart;
664 /*XXX would ip & port already be set up? */
665 deliver_host_address = string_copy(host->address);
666 deliver_host_port = host->port == PORT_NONE ? 25 : host->port;
667 event_defer_errno = addr->basic_errno;
669 router_name = addr->router->name;
670 transport_name = addr->transport->name;
671 deliver_domain = addr->domain;
672 deliver_localpart = addr->local_part;
674 (void) event_raise(action, evstr,
676 ? addr->basic_errno > 0
677 ? string_sprintf("%s: %s", addr->message, strerror(addr->basic_errno))
678 : string_copy(addr->message)
679 : addr->basic_errno > 0
680 ? string_copy(US strerror(addr->basic_errno))
684 deliver_localpart = save_local;
685 deliver_domain = save_domain;
686 router_name = transport_name = NULL;
690 /*************************************************
691 * Reap SMTP specific responses *
692 *************************************************/
694 smtp_discard_responses(smtp_context * sx, smtp_transport_options_block * ob,
697 uschar flushbuffer[4096];
701 if (!smtp_read_response(sx, flushbuffer, sizeof(flushbuffer),
702 '2', ob->command_timeout)
703 && (errno != 0 || flushbuffer[0] == 0))
710 /* Return boolean success */
713 smtp_reap_banner(smtp_context * sx)
716 #if defined(__linux__) && defined(TCP_QUICKACK)
717 { /* Hack to get QUICKACK disabled; has to be right after 3whs, and has to on->off */
718 int sock = sx->cctx.sock;
719 struct pollfd p = {.fd = sock, .events = POLLOUT};
720 if (poll(&p, 1, 1000) >= 0) /* retval test solely for compiler quitening */
722 (void) setsockopt(sock, IPPROTO_TCP, TCP_QUICKACK, US &on, sizeof(on));
723 (void) setsockopt(sock, IPPROTO_TCP, TCP_QUICKACK, US &off, sizeof(off));
727 good_response = smtp_read_response(sx, sx->buffer, sizeof(sx->buffer),
728 '2', (SOB sx->conn_args.ob)->command_timeout);
729 #ifdef EXPERIMENTAL_DSN_INFO
730 sx->smtp_greeting = string_copy(sx->buffer);
732 return good_response;
736 smtp_reap_ehlo(smtp_context * sx)
738 if (!smtp_read_response(sx, sx->buffer, sizeof(sx->buffer), '2',
739 (SOB sx->conn_args.ob)->command_timeout))
741 if (errno != 0 || sx->buffer[0] == 0 || sx->lmtp)
743 #ifdef EXPERIMENTAL_DSN_INFO
744 sx->helo_response = string_copy(sx->buffer);
750 #ifdef EXPERIMENTAL_DSN_INFO
751 sx->helo_response = string_copy(sx->buffer);
753 #ifndef DISABLE_EVENT
754 (void) event_raise(sx->conn_args.tblock->event_action,
755 US"smtp:ehlo", sx->buffer, NULL);
761 /******************************************************************************/
763 #ifdef EXPERIMENTAL_ESMTP_LIMITS
764 /* If TLS, or TLS not offered, called with the EHLO response in the buffer.
765 Check it for a LIMITS keyword and parse values into the smtp context structure.
767 We don't bother with peers that we won't talk TLS to, even though they can,
768 just ignore their LIMITS advice (if any) and treat them as if they do not.
769 This saves us dealing with a duplicate set of values. */
772 ehlo_response_limits_read(smtp_context * sx)
776 /* matches up to just after the first space after the keyword */
778 if (regex_match(regex_LIMITS, sx->buffer, -1, &match))
779 for (const uschar * s = sx->buffer + Ustrlen(match); *s; )
781 while (isspace(*s)) s++;
782 if (*s == '\n') break;
784 if (strncmpic(s, US"MAILMAX=", 8) == 0)
786 sx->peer_limit_mail = atoi(CS (s += 8));
787 while (isdigit(*s)) s++;
789 else if (strncmpic(s, US"RCPTMAX=", 8) == 0)
791 sx->peer_limit_rcpt = atoi(CS (s += 8));
792 while (isdigit(*s)) s++;
794 else if (strncmpic(s, US"RCPTDOMAINMAX=", 14) == 0)
796 sx->peer_limit_rcptdom = atoi(CS (s += 14));
797 while (isdigit(*s)) s++;
800 while (*s && !isspace(*s)) s++;
804 /* Apply given values to the current connection */
806 ehlo_limits_apply(smtp_context * sx,
807 unsigned limit_mail, unsigned limit_rcpt, unsigned limit_rcptdom)
809 if (limit_mail && limit_mail < sx->max_mail) sx->max_mail = limit_mail;
810 if (limit_rcpt && limit_rcpt < sx->max_rcpt) sx->max_rcpt = limit_rcpt;
813 DEBUG(D_transport) debug_printf("will treat as !multi_domain\n");
814 sx->single_rcpt_domain = TRUE;
818 /* Apply values from EHLO-resp to the current connection */
820 ehlo_response_limits_apply(smtp_context * sx)
822 ehlo_limits_apply(sx, sx->peer_limit_mail, sx->peer_limit_rcpt,
823 sx->peer_limit_rcptdom);
826 /* Apply values read from cache to the current connection */
828 ehlo_cache_limits_apply(smtp_context * sx)
830 ehlo_limits_apply(sx, sx->ehlo_resp.limit_mail, sx->ehlo_resp.limit_rcpt,
831 sx->ehlo_resp.limit_rcptdom);
835 /******************************************************************************/
837 #ifndef DISABLE_PIPE_CONNECT
839 ehlo_cache_key(const smtp_context * sx)
841 host_item * host = sx->conn_args.host;
842 return Ustrchr(host->address, ':')
843 ? string_sprintf("[%s]:%d.EHLO", host->address,
844 host->port == PORT_NONE ? sx->port : host->port)
845 : string_sprintf("%s:%d.EHLO", host->address,
846 host->port == PORT_NONE ? sx->port : host->port);
849 /* Cache EHLO-response info for use by early-pipe.
851 - During a normal flow on EHLO response (either cleartext or under TLS),
852 when we are willing to do PIPECONNECT and it is offered
853 - During an early-pipe flow on receiving the actual EHLO response and noting
854 disparity versus the cached info used, when PIPECONNECT is still being offered
856 We assume that suitable values have been set in the sx.ehlo_resp structure for
857 features and auths; we handle the copy of limits. */
860 write_ehlo_cache_entry(smtp_context * sx)
862 open_db dbblock, * dbm_file;
864 #ifdef EXPERIMENTAL_ESMTP_LIMITS
865 sx->ehlo_resp.limit_mail = sx->peer_limit_mail;
866 sx->ehlo_resp.limit_rcpt = sx->peer_limit_rcpt;
867 sx->ehlo_resp.limit_rcptdom = sx->peer_limit_rcptdom;
870 if ((dbm_file = dbfn_open(US"misc", O_RDWR, &dbblock, TRUE, TRUE)))
872 uschar * ehlo_resp_key = ehlo_cache_key(sx);
873 dbdata_ehlo_resp er = { .data = sx->ehlo_resp };
876 #ifdef EXPERIMENTAL_ESMTP_LIMITS
877 if (sx->ehlo_resp.limit_mail || sx->ehlo_resp.limit_rcpt || sx->ehlo_resp.limit_rcptdom)
878 debug_printf("writing clr %04x/%04x cry %04x/%04x lim %05d/%05d/%05d\n",
879 sx->ehlo_resp.cleartext_features, sx->ehlo_resp.cleartext_auths,
880 sx->ehlo_resp.crypted_features, sx->ehlo_resp.crypted_auths,
881 sx->ehlo_resp.limit_mail, sx->ehlo_resp.limit_rcpt,
882 sx->ehlo_resp.limit_rcptdom);
885 debug_printf("writing clr %04x/%04x cry %04x/%04x\n",
886 sx->ehlo_resp.cleartext_features, sx->ehlo_resp.cleartext_auths,
887 sx->ehlo_resp.crypted_features, sx->ehlo_resp.crypted_auths);
889 dbfn_write(dbm_file, ehlo_resp_key, &er, (int)sizeof(er));
890 dbfn_close(dbm_file);
895 invalidate_ehlo_cache_entry(smtp_context * sx)
897 open_db dbblock, * dbm_file;
899 if ( sx->early_pipe_active
900 && (dbm_file = dbfn_open(US"misc", O_RDWR, &dbblock, TRUE, TRUE)))
902 uschar * ehlo_resp_key = ehlo_cache_key(sx);
903 dbfn_delete(dbm_file, ehlo_resp_key);
904 dbfn_close(dbm_file);
909 read_ehlo_cache_entry(smtp_context * sx)
914 if (!(dbm_file = dbfn_open(US"misc", O_RDONLY, &dbblock, FALSE, TRUE)))
915 { DEBUG(D_transport) debug_printf("ehlo-cache: no misc DB\n"); }
918 uschar * ehlo_resp_key = ehlo_cache_key(sx);
919 dbdata_ehlo_resp * er;
921 if (!(er = dbfn_read_enforce_length(dbm_file, ehlo_resp_key, sizeof(dbdata_ehlo_resp))))
922 { DEBUG(D_transport) debug_printf("no ehlo-resp record\n"); }
923 else if (time(NULL) - er->time_stamp > retry_data_expire)
925 DEBUG(D_transport) debug_printf("ehlo-resp record too old\n");
926 dbfn_close(dbm_file);
927 if ((dbm_file = dbfn_open(US"misc", O_RDWR, &dbblock, TRUE, TRUE)))
928 dbfn_delete(dbm_file, ehlo_resp_key);
933 #ifdef EXPERIMENTAL_ESMTP_LIMITS
934 if (er->data.limit_mail || er->data.limit_rcpt || er->data.limit_rcptdom)
935 debug_printf("EHLO response bits from cache:"
936 " cleartext 0x%04x/0x%04x crypted 0x%04x/0x%04x lim %05d/%05d/%05d\n",
937 er->data.cleartext_features, er->data.cleartext_auths,
938 er->data.crypted_features, er->data.crypted_auths,
939 er->data.limit_mail, er->data.limit_rcpt, er->data.limit_rcptdom);
942 debug_printf("EHLO response bits from cache:"
943 " cleartext 0x%04x/0x%04x crypted 0x%04x/0x%04x\n",
944 er->data.cleartext_features, er->data.cleartext_auths,
945 er->data.crypted_features, er->data.crypted_auths);
947 sx->ehlo_resp = er->data;
948 #ifdef EXPERIMENTAL_ESMTP_LIMITS
949 ehlo_cache_limits_apply(sx);
951 dbfn_close(dbm_file);
954 dbfn_close(dbm_file);
961 /* Return an auths bitmap for the set of AUTH methods offered by the server
962 which match our authenticators. */
964 static unsigned short
965 study_ehlo_auths(smtp_context * sx)
970 unsigned short authbits = 0;
972 if (!sx->esmtp) return 0;
973 if (!regex_AUTH) regex_AUTH = regex_must_compile(AUTHS_REGEX, FALSE, TRUE);
974 if (!regex_match_and_setup(regex_AUTH, sx->buffer, 0, -1)) return 0;
975 expand_nmax = -1; /* reset */
976 names = string_copyn(expand_nstring[1], expand_nlength[1]);
978 for (au = auths, authnum = 0; au; au = au->next, authnum++) if (au->client)
980 const uschar * list = names;
982 for (int sep = ' '; s = string_nextinlist(&list, &sep, NULL, 0); )
983 if (strcmpic(au->public_name, s) == 0)
984 { authbits |= BIT(authnum); break; }
988 debug_printf("server offers %s AUTH, methods '%s', bitmap 0x%04x\n",
989 tls_out.active.sock >= 0 ? "crypted" : "plaintext", names, authbits);
991 if (tls_out.active.sock >= 0)
992 sx->ehlo_resp.crypted_auths = authbits;
994 sx->ehlo_resp.cleartext_auths = authbits;
1001 /* Wait for and check responses for early-pipelining.
1003 Called from the lower-level smtp_read_response() function
1004 used for general code that assume synchronisation, if context
1005 flags indicate outstanding early-pipelining commands. Also
1006 called fom sync_responses() which handles pipelined commands.
1009 sx smtp connection context
1010 countp number of outstanding responses, adjusted on return
1014 DEFER error on first read of TLS'd conn
1015 FAIL SMTP error in response
1018 smtp_reap_early_pipe(smtp_context * sx, int * countp)
1020 BOOL pending_BANNER = sx->pending_BANNER;
1021 BOOL pending_EHLO = sx->pending_EHLO;
1024 sx->pending_BANNER = FALSE; /* clear early to avoid recursion */
1025 sx->pending_EHLO = FALSE;
1029 DEBUG(D_transport) debug_printf("%s expect banner\n", __FUNCTION__);
1031 if (!smtp_reap_banner(sx))
1033 DEBUG(D_transport) debug_printf("bad banner\n");
1034 if (tls_out.active.sock >= 0) rc = DEFER;
1041 unsigned peer_offered;
1042 unsigned short authbits = 0, * ap;
1044 DEBUG(D_transport) debug_printf("%s expect ehlo\n", __FUNCTION__);
1046 if (!smtp_reap_ehlo(sx))
1048 DEBUG(D_transport) debug_printf("bad response for EHLO\n");
1049 if (tls_out.active.sock >= 0) rc = DEFER;
1053 /* Compare the actual EHLO response extensions and AUTH methods to the cached
1054 value we assumed; on difference, dump or rewrite the cache and arrange for a
1057 ap = tls_out.active.sock < 0
1058 ? &sx->ehlo_resp.cleartext_auths : &sx->ehlo_resp.crypted_auths;
1060 peer_offered = ehlo_response(sx->buffer,
1061 (tls_out.active.sock < 0 ? OPTION_TLS : 0)
1062 | OPTION_CHUNKING | OPTION_PRDR | OPTION_DSN | OPTION_PIPE | OPTION_SIZE
1063 | OPTION_UTF8 | OPTION_EARLY_PIPE
1065 #ifdef EXPERIMENTAL_ESMTP_LIMITS
1066 if (tls_out.active.sock >= 0 || !(peer_offered & OPTION_TLS))
1067 ehlo_response_limits_read(sx);
1069 if ( peer_offered != sx->peer_offered
1070 || (authbits = study_ehlo_auths(sx)) != *ap)
1073 debug_printf("EHLO %s extensions changed, 0x%04x/0x%04x -> 0x%04x/0x%04x\n",
1074 tls_out.active.sock < 0 ? "cleartext" : "crypted",
1075 sx->peer_offered, *ap, peer_offered, authbits);
1076 if (peer_offered & OPTION_EARLY_PIPE)
1078 *(tls_out.active.sock < 0
1079 ? &sx->ehlo_resp.cleartext_features : &sx->ehlo_resp.crypted_features) =
1082 write_ehlo_cache_entry(sx);
1085 invalidate_ehlo_cache_entry(sx);
1087 return OK; /* just carry on */
1089 #ifdef EXPERIMENTAL_ESMTP_LIMITS
1090 /* If we are handling LIMITS, compare the actual EHLO LIMITS values with the
1091 cached values and invalidate cache if different. OK to carry on with
1092 connect since values are advisory. */
1094 if ( (tls_out.active.sock >= 0 || !(peer_offered & OPTION_TLS))
1095 && ( sx->peer_limit_mail != sx->ehlo_resp.limit_mail
1096 || sx->peer_limit_rcpt != sx->ehlo_resp.limit_rcpt
1097 || sx->peer_limit_rcptdom != sx->ehlo_resp.limit_rcptdom
1102 debug_printf("EHLO LIMITS changed:");
1103 if (sx->peer_limit_mail != sx->ehlo_resp.limit_mail)
1104 debug_printf(" MAILMAX %u -> %u\n", sx->ehlo_resp.limit_mail, sx->peer_limit_mail);
1105 else if (sx->peer_limit_rcpt != sx->ehlo_resp.limit_rcpt)
1106 debug_printf(" RCPTMAX %u -> %u\n", sx->ehlo_resp.limit_rcpt, sx->peer_limit_rcpt);
1108 debug_printf(" RCPTDOMAINMAX %u -> %u\n", sx->ehlo_resp.limit_rcptdom, sx->peer_limit_rcptdom);
1110 invalidate_ehlo_cache_entry(sx);
1118 invalidate_ehlo_cache_entry(sx);
1119 (void) smtp_discard_responses(sx, sx->conn_args.ob, *countp);
1122 #endif /*!DISABLE_PIPE_CONNECT*/
1125 /*************************************************
1126 * Synchronize SMTP responses *
1127 *************************************************/
1129 /* This function is called from smtp_deliver() to receive SMTP responses from
1130 the server, and match them up with the commands to which they relate. When
1131 PIPELINING is not in use, this function is called after every command, and is
1132 therefore somewhat over-engineered, but it is simpler to use a single scheme
1133 that works both with and without PIPELINING instead of having two separate sets
1136 The set of commands that are buffered up with pipelining may start with MAIL
1137 and may end with DATA; in between are RCPT commands that correspond to the
1138 addresses whose status is PENDING_DEFER. All other commands (STARTTLS, AUTH,
1139 etc.) are never buffered.
1141 Errors after MAIL or DATA abort the whole process leaving the response in the
1142 buffer. After MAIL, pending responses are flushed, and the original command is
1143 re-instated in big_buffer for error messages. For RCPT commands, the remote is
1144 permitted to reject some recipient addresses while accepting others. However
1145 certain errors clearly abort the whole process. Set the value in
1146 transport_return to PENDING_OK if the address is accepted. If there is a
1147 subsequent general error, it will get reset accordingly. If not, it will get
1148 converted to OK at the end.
1151 sx smtp connection context
1152 count the number of responses to read
1153 pending_DATA 0 if last command sent was not DATA
1154 +1 if previously had a good recipient
1155 -1 if not previously had a good recipient
1157 Returns: 3 if at least one address had 2xx and one had 5xx
1158 2 if at least one address had 5xx but none had 2xx
1159 1 if at least one host had a 2xx response, but none had 5xx
1160 0 no address had 2xx or 5xx but no errors (all 4xx, or just DATA)
1161 -1 timeout while reading RCPT response
1162 -2 I/O or other non-response error for RCPT
1163 -3 DATA or MAIL failed - errno and buffer set
1164 -4 banner or EHLO failed (early-pipelining)
1165 -5 banner or EHLO failed (early-pipelining, TLS)
1169 sync_responses(smtp_context * sx, int count, int pending_DATA)
1171 address_item * addr = sx->sync_addr;
1172 smtp_transport_options_block * ob = sx->conn_args.ob;
1175 #ifndef DISABLE_PIPE_CONNECT
1177 if ((rc = smtp_reap_early_pipe(sx, &count)) != OK)
1178 return rc == FAIL ? -4 : -5;
1181 /* Handle the response for a MAIL command. On error, reinstate the original
1182 command in big_buffer for error message use, and flush any further pending
1183 responses before returning, except after I/O errors and timeouts. */
1185 if (sx->pending_MAIL)
1187 DEBUG(D_transport) debug_printf("%s expect mail\n", __FUNCTION__);
1189 sx->pending_MAIL = sx->RCPT_452 = FALSE;
1190 if (!smtp_read_response(sx, sx->buffer, sizeof(sx->buffer),
1191 '2', ob->command_timeout))
1193 DEBUG(D_transport) debug_printf("bad response for MAIL\n");
1194 Ustrcpy(big_buffer, mail_command); /* Fits, because it came from there! */
1195 if (errno == ERRNO_TLSFAILURE)
1197 if (errno == 0 && sx->buffer[0] != 0)
1200 if (sx->buffer[0] == '4')
1202 save_errno = ERRNO_MAIL4XX;
1203 addr->more_errno |= ((sx->buffer[1] - '0')*10 + sx->buffer[2] - '0') << 8;
1205 count = smtp_discard_responses(sx, ob, count);
1209 if (pending_DATA) count--; /* Number of RCPT responses to come */
1210 while (count-- > 0) /* Mark any pending addrs with the host used */
1212 while (addr->transport_return != PENDING_DEFER) addr = addr->next;
1213 addr->host_used = sx->conn_args.host;
1220 if (pending_DATA) count--; /* Number of RCPT responses to come */
1222 /* Read and handle the required number of RCPT responses, matching each one up
1223 with an address by scanning for the next address whose status is PENDING_DEFER.
1228 while (addr->transport_return != PENDING_DEFER)
1229 if (!(addr = addr->next))
1232 /* The address was accepted */
1233 addr->host_used = sx->conn_args.host;
1235 DEBUG(D_transport) debug_printf("%s expect rcpt for %s\n", __FUNCTION__, addr->address);
1236 if (smtp_read_response(sx, sx->buffer, sizeof(sx->buffer),
1237 '2', ob->command_timeout))
1240 addr->transport_return = PENDING_OK;
1242 /* If af_dr_retry_exists is set, there was a routing delay on this address;
1243 ensure that any address-specific retry record is expunged. We do this both
1244 for the basic key and for the version that also includes the sender. */
1246 if (testflag(addr, af_dr_retry_exists))
1248 uschar *altkey = string_sprintf("%s:<%s>", addr->address_retry_key,
1250 retry_add_item(addr, altkey, rf_delete);
1251 retry_add_item(addr, addr->address_retry_key, rf_delete);
1255 /* Error on first TLS read */
1257 else if (errno == ERRNO_TLSFAILURE)
1260 /* Timeout while reading the response */
1262 else if (errno == ETIMEDOUT)
1264 uschar *message = string_sprintf("SMTP timeout after RCPT TO:<%s>",
1265 transport_rcpt_address(addr, sx->conn_args.tblock->rcpt_include_affixes));
1266 set_errno_nohost(sx->first_addr, ETIMEDOUT, message, DEFER, FALSE, &sx->delivery_start);
1267 retry_add_item(addr, addr->address_retry_key, 0);
1268 update_waiting = FALSE;
1272 /* Handle other errors in obtaining an SMTP response by returning -1. This
1273 will cause all the addresses to be deferred. Restore the SMTP command in
1274 big_buffer for which we are checking the response, so the error message
1277 else if (errno != 0 || sx->buffer[0] == 0)
1279 gstring gs = { .size = big_buffer_size, .ptr = 0, .s = big_buffer }, * g = &gs;
1281 /* Use taint-unchecked routines for writing into big_buffer, trusting
1282 that we'll never expand it. */
1284 g = string_fmt_append_f(g, SVFMT_TAINT_NOCHK, "RCPT TO:<%s>",
1285 transport_rcpt_address(addr, sx->conn_args.tblock->rcpt_include_affixes));
1286 string_from_gstring(g);
1290 /* Handle SMTP permanent and temporary response codes. */
1295 string_sprintf("SMTP error from remote mail server after RCPT TO:<%s>: "
1296 "%s", transport_rcpt_address(addr, sx->conn_args.tblock->rcpt_include_affixes),
1297 string_printing(sx->buffer));
1298 setflag(addr, af_pass_message);
1300 msglog_line(sx->conn_args.host, addr->message);
1302 /* The response was 5xx */
1304 if (sx->buffer[0] == '5')
1306 addr->transport_return = FAIL;
1310 /* The response was 4xx */
1314 addr->transport_return = DEFER;
1315 addr->basic_errno = ERRNO_RCPT4XX;
1316 addr->more_errno |= ((sx->buffer[1] - '0')*10 + sx->buffer[2] - '0') << 8;
1320 #ifndef DISABLE_EVENT
1321 event_defer_errno = addr->more_errno;
1322 msg_event_raise(US"msg:rcpt:host:defer", addr);
1324 /* If a 452 and we've had at least one 2xx or 5xx, set next_addr to the
1325 start point for another MAIL command. */
1327 if (addr->more_errno >> 8 == 52 && yield & 3)
1329 if (!sx->RCPT_452) /* initialised at MAIL-ack above */
1332 debug_printf("%s: seen first 452 too-many-rcpts\n", __FUNCTION__);
1333 sx->RCPT_452 = TRUE;
1334 sx->next_addr = addr;
1336 addr->transport_return = PENDING_DEFER;
1337 addr->basic_errno = 0;
1341 /* Log temporary errors if there are more hosts to be tried.
1342 If not, log this last one in the == line. */
1344 if (sx->conn_args.host->next)
1345 if (LOGGING(outgoing_port))
1346 log_write(0, LOG_MAIN, "H=%s [%s]:%d %s", sx->conn_args.host->name,
1347 sx->conn_args.host->address,
1348 sx->port == PORT_NONE ? 25 : sx->port, addr->message);
1350 log_write(0, LOG_MAIN, "H=%s [%s]: %s", sx->conn_args.host->name,
1351 sx->conn_args.host->address, addr->message);
1353 #ifndef DISABLE_EVENT
1355 msg_event_raise(US"msg:rcpt:defer", addr);
1358 /* Do not put this message on the list of those waiting for specific
1359 hosts, as otherwise it is likely to be tried too often. */
1361 update_waiting = FALSE;
1363 /* Add a retry item for the address so that it doesn't get tried again
1364 too soon. If address_retry_include_sender is true, add the sender address
1365 to the retry key. */
1367 retry_add_item(addr,
1368 ob->address_retry_include_sender
1369 ? string_sprintf("%s:<%s>", addr->address_retry_key, sender_address)
1370 : addr->address_retry_key,
1376 if (count && !(addr = addr->next))
1378 } /* Loop for next RCPT response */
1380 /* Update where to start at for the next block of responses, unless we
1381 have already handled all the addresses. */
1383 if (addr) sx->sync_addr = addr->next;
1385 /* Handle a response to DATA. If we have not had any good recipients, either
1386 previously or in this block, the response is ignored. */
1388 if (pending_DATA != 0)
1390 DEBUG(D_transport) debug_printf("%s expect data\n", __FUNCTION__);
1391 if (!smtp_read_response(sx, sx->buffer, sizeof(sx->buffer),
1392 '3', ob->command_timeout))
1398 if (errno == ERRNO_TLSFAILURE) /* Error on first TLS read */
1401 if (pending_DATA > 0 || (yield & 1) != 0)
1403 if (errno == 0 && sx->buffer[0] == '4')
1405 errno = ERRNO_DATA4XX;
1406 sx->first_addr->more_errno |= ((sx->buffer[1] - '0')*10 + sx->buffer[2] - '0') << 8;
1410 (void)check_response(sx->conn_args.host, &errno, 0, sx->buffer, &code, &msg, &pass_message);
1411 DEBUG(D_transport) debug_printf("%s\nerror for DATA ignored: pipelining "
1412 "is in use and there were no good recipients\n", msg);
1416 /* All responses read and handled; MAIL (if present) received 2xx and DATA (if
1417 present) received 3xx. If any RCPTs were handled and yielded anything other
1418 than 4xx, yield will be set non-zero. */
1427 /* Try an authenticator's client entry */
1430 try_authenticator(smtp_context * sx, auth_instance * au)
1432 smtp_transport_options_block * ob = sx->conn_args.ob; /* transport options */
1433 host_item * host = sx->conn_args.host; /* host to deliver to */
1436 /* Set up globals for error messages */
1438 authenticator_name = au->name;
1439 driver_srcfile = au->srcfile;
1440 driver_srcline = au->srcline;
1442 sx->outblock.authenticating = TRUE;
1443 rc = (au->info->clientcode)(au, sx, ob->command_timeout,
1444 sx->buffer, sizeof(sx->buffer));
1445 sx->outblock.authenticating = FALSE;
1446 driver_srcfile = authenticator_name = NULL; driver_srcline = 0;
1447 DEBUG(D_transport) debug_printf("%s authenticator yielded %d\n", au->name, rc);
1449 /* A temporary authentication failure must hold up delivery to
1450 this host. After a permanent authentication failure, we carry on
1451 to try other authentication methods. If all fail hard, try to
1452 deliver the message unauthenticated unless require_auth was set. */
1457 f.smtp_authenticated = TRUE; /* stops the outer loop */
1458 client_authenticator = au->name;
1459 if (au->set_client_id)
1460 client_authenticated_id = expand_string(au->set_client_id);
1463 /* Failure after writing a command */
1468 /* Failure after reading a response */
1471 if (errno != 0 || sx->buffer[0] != '5') return FAIL;
1472 log_write(0, LOG_MAIN, "%s authenticator failed H=%s [%s] %s",
1473 au->name, host->name, host->address, sx->buffer);
1476 /* Failure by some other means. In effect, the authenticator
1477 decided it wasn't prepared to handle this case. Typically this
1478 is the result of "fail" in an expansion string. Do we need to
1479 log anything here? Feb 2006: a message is now put in the buffer
1480 if logging is required. */
1483 if (*sx->buffer != 0)
1484 log_write(0, LOG_MAIN, "%s authenticator cancelled "
1485 "authentication H=%s [%s] %s", au->name, host->name,
1486 host->address, sx->buffer);
1489 /* Internal problem, message in buffer. */
1492 set_errno_nohost(sx->addrlist, ERRNO_AUTHPROB, string_copy(sx->buffer),
1493 DEFER, FALSE, &sx->delivery_start);
1502 /* Do the client side of smtp-level authentication.
1505 sx smtp connection context
1507 sx->buffer should have the EHLO response from server (gets overwritten)
1510 OK Success, or failed (but not required): global "smtp_authenticated" set
1511 DEFER Failed authentication (and was required)
1512 ERROR Internal problem
1514 FAIL_SEND Failed communications - transmit
1519 smtp_auth(smtp_context * sx)
1521 host_item * host = sx->conn_args.host; /* host to deliver to */
1522 smtp_transport_options_block * ob = sx->conn_args.ob; /* transport options */
1523 int require_auth = verify_check_given_host(CUSS &ob->hosts_require_auth, host);
1524 #ifndef DISABLE_PIPE_CONNECT
1525 unsigned short authbits = tls_out.active.sock >= 0
1526 ? sx->ehlo_resp.crypted_auths : sx->ehlo_resp.cleartext_auths;
1528 uschar * fail_reason = US"server did not advertise AUTH support";
1530 f.smtp_authenticated = FALSE;
1531 client_authenticator = client_authenticated_id = client_authenticated_sender = NULL;
1534 regex_AUTH = regex_must_compile(AUTHS_REGEX, FALSE, TRUE);
1536 /* Is the server offering AUTH? */
1540 #ifndef DISABLE_PIPE_CONNECT
1541 sx->early_pipe_active ? authbits
1544 regex_match_and_setup(regex_AUTH, sx->buffer, 0, -1)
1547 uschar * names = NULL;
1548 expand_nmax = -1; /* reset */
1550 #ifndef DISABLE_PIPE_CONNECT
1551 if (!sx->early_pipe_active)
1553 names = string_copyn(expand_nstring[1], expand_nlength[1]);
1555 /* Must not do this check until after we have saved the result of the
1556 regex match above as the check could be another RE. */
1558 if ( require_auth == OK
1559 || verify_check_given_host(CUSS &ob->hosts_try_auth, host) == OK)
1561 DEBUG(D_transport) debug_printf("scanning authentication mechanisms\n");
1562 fail_reason = US"no common mechanisms were found";
1564 #ifndef DISABLE_PIPE_CONNECT
1565 if (sx->early_pipe_active)
1567 /* Scan our authenticators (which support use by a client and were offered
1568 by the server (checked at cache-write time)), not suppressed by
1569 client_condition. If one is found, attempt to authenticate by calling its
1570 client function. We are limited to supporting up to 16 authenticator
1571 public-names by the number of bits in a short. */
1577 for (bitnum = 0, au = auths;
1578 !f.smtp_authenticated && au && bitnum < 16;
1579 bitnum++, au = au->next) if (authbits & BIT(bitnum))
1581 if ( au->client_condition
1582 && !expand_check_condition(au->client_condition, au->name,
1583 US"client authenticator"))
1585 DEBUG(D_transport) debug_printf("skipping %s authenticator: %s\n",
1586 au->name, "client_condition is false");
1590 /* Found data for a listed mechanism. Call its client entry. Set
1591 a flag in the outblock so that data is overwritten after sending so
1592 that reflections don't show it. */
1594 fail_reason = US"authentication attempt(s) failed";
1596 if ((rc = try_authenticator(sx, au)) != OK)
1603 /* Scan the configured authenticators looking for one which is configured
1604 for use as a client, which is not suppressed by client_condition, and
1605 whose name matches an authentication mechanism supported by the server.
1606 If one is found, attempt to authenticate by calling its client function.
1609 for (auth_instance * au = auths; !f.smtp_authenticated && au; au = au->next)
1614 || ( au->client_condition
1615 && !expand_check_condition(au->client_condition, au->name,
1616 US"client authenticator")))
1618 DEBUG(D_transport) debug_printf("skipping %s authenticator: %s\n",
1620 (au->client)? "client_condition is false" :
1621 "not configured as a client");
1625 /* Loop to scan supported server mechanisms */
1629 int len = Ustrlen(au->public_name);
1632 while (isspace(*p)) p++;
1634 if (strncmpic(au->public_name, p, len) != 0 ||
1635 (p[len] != 0 && !isspace(p[len])))
1637 while (*p != 0 && !isspace(*p)) p++;
1641 /* Found data for a listed mechanism. Call its client entry. Set
1642 a flag in the outblock so that data is overwritten after sending so
1643 that reflections don't show it. */
1645 fail_reason = US"authentication attempt(s) failed";
1647 if ((rc = try_authenticator(sx, au)) != OK)
1650 break; /* If not authenticated, try next authenticator */
1651 } /* Loop for scanning supported server mechanisms */
1652 } /* Loop for further authenticators */
1656 /* If we haven't authenticated, but are required to, give up. */
1658 if (require_auth == OK && !f.smtp_authenticated)
1660 #ifndef DISABLE_PIPE_CONNECT
1661 invalidate_ehlo_cache_entry(sx);
1663 set_errno_nohost(sx->addrlist, ERRNO_AUTHFAIL,
1664 string_sprintf("authentication required but %s", fail_reason), DEFER,
1665 FALSE, &sx->delivery_start);
1673 /* Construct AUTH appendix string for MAIL TO */
1676 sx context for smtp connection
1677 p point in sx->buffer to build string
1678 addrlist chain of potential addresses to deliver
1680 Globals f.smtp_authenticated
1681 client_authenticated_sender
1682 Return True on error, otherwise buffer has (possibly empty) terminated string
1686 smtp_mail_auth_str(smtp_context * sx, uschar * p, address_item * addrlist)
1688 smtp_transport_options_block * ob = sx->conn_args.ob;
1689 uschar * local_authenticated_sender = authenticated_sender;
1692 debug_printf("smtp_mail_auth_str: as<%s> os<%s> SA<%s>\n",
1693 authenticated_sender, ob->authenticated_sender, f.smtp_authenticated?"Y":"N");
1696 if (ob->authenticated_sender)
1698 uschar * new = expand_string(ob->authenticated_sender);
1701 if (!f.expand_string_forcedfail)
1703 uschar *message = string_sprintf("failed to expand "
1704 "authenticated_sender: %s", expand_string_message);
1705 set_errno_nohost(addrlist, ERRNO_EXPANDFAIL, message, DEFER, FALSE, &sx->delivery_start);
1710 local_authenticated_sender = new;
1713 /* Add the authenticated sender address if present */
1715 if ( (f.smtp_authenticated || ob->authenticated_sender_force)
1716 && local_authenticated_sender)
1718 string_format_nt(p, sizeof(sx->buffer) - (p-sx->buffer), " AUTH=%s",
1719 auth_xtextencode(local_authenticated_sender,
1720 Ustrlen(local_authenticated_sender)));
1721 client_authenticated_sender = string_copy(local_authenticated_sender);
1731 typedef struct smtp_compare_s
1733 uschar * current_sender_address;
1734 struct transport_instance * tblock;
1738 /* Create a unique string that identifies this message, it is based on
1739 sender_address, helo_data and tls_certificate if enabled.
1743 smtp_local_identity(uschar * sender, struct transport_instance * tblock)
1745 address_item * addr1;
1746 uschar * if1 = US"";
1747 uschar * helo1 = US"";
1749 uschar * tlsc1 = US"";
1751 uschar * save_sender_address = sender_address;
1752 uschar * local_identity = NULL;
1753 smtp_transport_options_block * ob = SOB tblock->options_block;
1755 sender_address = sender;
1757 addr1 = deliver_make_addr (sender, TRUE);
1758 deliver_set_expansions(addr1);
1761 if1 = expand_string(ob->interface);
1764 helo1 = expand_string(ob->helo_data);
1767 if (ob->tls_certificate)
1768 tlsc1 = expand_string(ob->tls_certificate);
1769 local_identity = string_sprintf ("%s^%s^%s", if1, helo1, tlsc1);
1771 local_identity = string_sprintf ("%s^%s", if1, helo1);
1774 deliver_set_expansions(NULL);
1775 sender_address = save_sender_address;
1777 return local_identity;
1782 /* This routine is a callback that is called from transport_check_waiting.
1783 This function will evaluate the incoming message versus the previous
1784 message. If the incoming message is using a different local identity then
1785 we will veto this new message. */
1788 smtp_are_same_identities(uschar * message_id, smtp_compare_t * s_compare)
1790 uschar * message_local_identity,
1791 * current_local_identity,
1792 * new_sender_address;
1794 current_local_identity =
1795 smtp_local_identity(s_compare->current_sender_address, s_compare->tblock);
1797 if (!(new_sender_address = spool_sender_from_msgid(message_id)))
1801 message_local_identity =
1802 smtp_local_identity(new_sender_address, s_compare->tblock);
1804 return Ustrcmp(current_local_identity, message_local_identity) == 0;
1810 ehlo_response(uschar * buf, unsigned checks)
1812 PCRE2_SIZE bsize = Ustrlen(buf);
1813 pcre2_match_data * md = pcre2_match_data_create(1, pcre_gen_ctx);
1815 /* debug_printf("%s: check for 0x%04x\n", __FUNCTION__, checks); */
1818 if ( checks & OPTION_TLS
1819 && pcre2_match(regex_STARTTLS,
1820 (PCRE2_SPTR)buf, bsize, 0, PCRE_EOPT, md, pcre_mtc_ctx) < 0)
1822 checks &= ~OPTION_TLS;
1824 if ( checks & OPTION_IGNQ
1825 && pcre2_match(regex_IGNOREQUOTA,
1826 (PCRE2_SPTR)buf, bsize, 0, PCRE_EOPT, md, pcre_mtc_ctx) < 0)
1827 checks &= ~OPTION_IGNQ;
1829 if ( checks & OPTION_CHUNKING
1830 && pcre2_match(regex_CHUNKING,
1831 (PCRE2_SPTR)buf, bsize, 0, PCRE_EOPT, md, pcre_mtc_ctx) < 0)
1832 checks &= ~OPTION_CHUNKING;
1834 #ifndef DISABLE_PRDR
1835 if ( checks & OPTION_PRDR
1836 && pcre2_match(regex_PRDR,
1837 (PCRE2_SPTR)buf, bsize, 0, PCRE_EOPT, md, pcre_mtc_ctx) < 0)
1839 checks &= ~OPTION_PRDR;
1842 if ( checks & OPTION_UTF8
1843 && pcre2_match(regex_UTF8,
1844 (PCRE2_SPTR)buf, bsize, 0, PCRE_EOPT, md, pcre_mtc_ctx) < 0)
1846 checks &= ~OPTION_UTF8;
1848 if ( checks & OPTION_DSN
1849 && pcre2_match(regex_DSN,
1850 (PCRE2_SPTR)buf, bsize, 0, PCRE_EOPT, md, pcre_mtc_ctx) < 0)
1851 checks &= ~OPTION_DSN;
1853 if ( checks & OPTION_PIPE
1854 && pcre2_match(regex_PIPELINING,
1855 (PCRE2_SPTR)buf, bsize, 0, PCRE_EOPT, md, pcre_mtc_ctx) < 0)
1856 checks &= ~OPTION_PIPE;
1858 if ( checks & OPTION_SIZE
1859 && pcre2_match(regex_SIZE,
1860 (PCRE2_SPTR)buf, bsize, 0, PCRE_EOPT, md, pcre_mtc_ctx) < 0)
1861 checks &= ~OPTION_SIZE;
1863 #ifndef DISABLE_PIPE_CONNECT
1864 if ( checks & OPTION_EARLY_PIPE
1865 && pcre2_match(regex_EARLY_PIPE,
1866 (PCRE2_SPTR)buf, bsize, 0, PCRE_EOPT, md, pcre_mtc_ctx) < 0)
1868 checks &= ~OPTION_EARLY_PIPE;
1870 pcre2_match_data_free(md);
1871 /* debug_printf("%s: found 0x%04x\n", __FUNCTION__, checks); */
1877 /* Callback for emitting a BDAT data chunk header.
1879 If given a nonzero size, first flush any buffered SMTP commands
1880 then emit the command.
1882 Reap previous SMTP command responses if requested, and always reap
1883 the response from a previous BDAT command.
1886 tctx transport context
1887 chunk_size value for SMTP BDAT command
1889 tc_chunk_last add LAST option to SMTP BDAT command
1890 tc_reap_prev reap response to previous SMTP commands
1894 DEFER TLS error on first read (EHLO-resp); errno set
1898 smtp_chunk_cmd_callback(transport_ctx * tctx, unsigned chunk_size,
1901 smtp_transport_options_block * ob = SOB tctx->tblock->options_block;
1902 smtp_context * sx = tctx->smtp_context;
1906 /* Write SMTP chunk header command. If not reaping responses, note that
1907 there may be more writes (like, the chunk data) done soon. */
1911 #ifndef DISABLE_PIPE_CONNECT
1912 BOOL new_conn = !!(sx->outblock.conn_args);
1914 if((cmd_count = smtp_write_command(sx,
1915 flags & tc_reap_prev ? SCMD_FLUSH : SCMD_MORE,
1916 "BDAT %u%s\r\n", chunk_size, flags & tc_chunk_last ? " LAST" : "")
1917 ) < 0) return ERROR;
1918 if (flags & tc_chunk_last)
1919 data_command = string_copy(big_buffer); /* Save for later error message */
1920 #ifndef DISABLE_PIPE_CONNECT
1921 /* That command write could have been the one that made the connection.
1922 Copy the fd from the client conn ctx (smtp transport specific) to the
1923 generic transport ctx. */
1926 tctx->u.fd = sx->outblock.cctx->sock;
1930 prev_cmd_count = cmd_count += sx->cmd_count;
1932 /* Reap responses for any previous, but not one we just emitted */
1936 if (sx->pending_BDAT)
1939 if (flags & tc_reap_prev && prev_cmd_count > 0)
1941 DEBUG(D_transport) debug_printf("look for %d responses"
1942 " for previous pipelined cmds\n", prev_cmd_count);
1944 switch(sync_responses(sx, prev_cmd_count, 0))
1946 case 1: /* 2xx (only) => OK */
1947 case 3: sx->good_RCPT = TRUE; /* 2xx & 5xx => OK & progress made */
1948 case 2: sx->completed_addr = TRUE; /* 5xx (only) => progress made */
1949 case 0: break; /* No 2xx or 5xx, but no probs */
1951 case -5: errno = ERRNO_TLSFAILURE;
1953 #ifndef DISABLE_PIPE_CONNECT
1954 case -4: /* non-2xx for pipelined banner or EHLO */
1956 case -1: /* Timeout on RCPT */
1957 default: return ERROR; /* I/O error, or any MAIL/DATA error */
1960 if (!sx->pending_BDAT)
1961 pipelining_active = FALSE;
1964 /* Reap response for an outstanding BDAT */
1966 if (sx->pending_BDAT)
1968 DEBUG(D_transport) debug_printf("look for one response for BDAT\n");
1970 if (!smtp_read_response(sx, sx->buffer, sizeof(sx->buffer), '2',
1971 ob->command_timeout))
1973 if (errno == 0 && sx->buffer[0] == '4')
1975 errno = ERRNO_DATA4XX; /*XXX does this actually get used? */
1976 sx->addrlist->more_errno |=
1977 ((sx->buffer[1] - '0')*10 + sx->buffer[2] - '0') << 8;
1982 sx->pending_BDAT = FALSE;
1983 pipelining_active = FALSE;
1985 else if (chunk_size > 0)
1986 sx->pending_BDAT = TRUE;
1989 sx->cmd_count = cmd_count;
1995 /*************************************************
1996 * Make connection for given message *
1997 *************************************************/
2001 sx connection context
2002 suppress_tls if TRUE, don't attempt a TLS connection - this is set for
2003 a second attempt after TLS initialization fails
2005 Returns: OK - the connection was made and the delivery attempted;
2006 fd is set in the conn context, tls_out set up.
2007 DEFER - the connection could not be made, or something failed
2008 while setting up the SMTP session, or there was a
2009 non-message-specific error, such as a timeout.
2010 ERROR - helo_data or add_headers or authenticated_sender is
2011 specified for this transport, and the string failed
2015 smtp_setup_conn(smtp_context * sx, BOOL suppress_tls)
2017 smtp_transport_options_block * ob = sx->conn_args.tblock->options_block;
2018 BOOL pass_message = FALSE;
2019 uschar * message = NULL;
2022 uschar * tls_errstr;
2025 /* Many lines of clearing individual elements of *sx that used to
2026 be here have been replaced by a full memset to zero (de41aff051).
2027 There are two callers, this file and verify.c . Now we only set
2028 up nonzero elements. */
2030 sx->conn_args.ob = ob;
2032 sx->lmtp = strcmpic(ob->protocol, US"lmtp") == 0;
2033 sx->smtps = strcmpic(ob->protocol, US"smtps") == 0;
2034 sx->send_rset = TRUE;
2035 sx->send_quit = TRUE;
2036 sx->setting_up = TRUE;
2038 sx->dsn_all_lasthop = TRUE;
2041 verify_check_given_host(CUSS &ob->hosts_require_dane, sx->conn_args.host) == OK;
2044 if ((sx->max_mail = sx->conn_args.tblock->connection_max_messages) == 0) sx->max_mail = 999999;
2045 if ((sx->max_rcpt = sx->conn_args.tblock->max_addresses) == 0) sx->max_rcpt = 999999;
2046 sx->igquotstr = US"";
2047 if (!sx->helo_data) sx->helo_data = ob->helo_data;
2049 smtp_command = US"initial connection";
2051 /* Set up the buffer for reading SMTP response packets. */
2053 sx->inblock.buffer = sx->inbuffer;
2054 sx->inblock.buffersize = sizeof(sx->inbuffer);
2055 sx->inblock.ptr = sx->inbuffer;
2056 sx->inblock.ptrend = sx->inbuffer;
2058 /* Set up the buffer for holding SMTP commands while pipelining */
2060 sx->outblock.buffer = sx->outbuffer;
2061 sx->outblock.buffersize = sizeof(sx->outbuffer);
2062 sx->outblock.ptr = sx->outbuffer;
2064 /* Reset the parameters of a TLS session. */
2067 tls_out.cipher = NULL; /* the one we may use for this transport */
2068 tls_out.ourcert = NULL;
2069 tls_out.peercert = NULL;
2070 tls_out.peerdn = NULL;
2074 tls_out.ocsp = OCSP_NOT_REQ;
2075 #ifndef DISABLE_TLS_RESUME
2076 tls_out.resumption = 0;
2080 /* Flip the legacy TLS-related variables over to the outbound set in case
2081 they're used in the context of the transport. Don't bother resetting
2082 afterward (when being used by a transport) as we're in a subprocess.
2083 For verify, unflipped once the callout is dealt with */
2085 tls_modify_variables(&tls_out);
2090 set_errno_nohost(sx->addrlist, ERRNO_TLSFAILURE, US"TLS support not available",
2091 DEFER, FALSE, &sx->delivery_start);
2096 /* If we have a proxied TLS connection, check usability for this message */
2098 if (continue_hostname && continue_proxy_cipher)
2101 const uschar * sni = US"";
2103 # ifdef SUPPORT_DANE
2104 /* Check if the message will be DANE-verified; if so force its SNI */
2106 tls_out.dane_verified = FALSE;
2107 smtp_port_for_connect(sx->conn_args.host, sx->port);
2108 if ( sx->conn_args.host->dnssec == DS_YES
2109 && ( sx->dane_required
2110 || verify_check_given_host(CUSS &ob->hosts_try_dane, sx->conn_args.host) == OK
2112 switch (rc = tlsa_lookup(sx->conn_args.host, &sx->conn_args.tlsa_dnsa, sx->dane_required))
2114 case OK: sx->conn_args.dane = TRUE;
2115 ob->tls_tempfail_tryclear = FALSE; /* force TLS */
2116 ob->tls_sni = sx->conn_args.host->name; /* force SNI */
2118 case FAIL_FORCED: break;
2119 default: set_errno_nohost(sx->addrlist, ERRNO_DNSDEFER,
2120 string_sprintf("DANE error: tlsa lookup %s",
2122 rc, FALSE, &sx->delivery_start);
2123 # ifndef DISABLE_EVENT
2124 (void) event_raise(sx->conn_args.tblock->event_action,
2125 US"dane:fail", sx->dane_required
2126 ? US"dane-required" : US"dnssec-invalid",
2133 /* If the SNI or the DANE status required for the new message differs from the
2134 existing conn drop the connection to force a new one. */
2136 if (ob->tls_sni && !(sni = expand_cstring(ob->tls_sni)))
2137 log_write(0, LOG_MAIN|LOG_PANIC,
2138 "<%s>: failed to expand transport's tls_sni value: %s",
2139 sx->addrlist->address, expand_string_message);
2141 # ifdef SUPPORT_DANE
2142 if ( (continue_proxy_sni ? (Ustrcmp(continue_proxy_sni, sni) == 0) : !*sni)
2143 && continue_proxy_dane == sx->conn_args.dane)
2145 tls_out.sni = US sni;
2146 if ((tls_out.dane_verified = continue_proxy_dane))
2147 sx->conn_args.host->dnssec = DS_YES;
2150 if ((continue_proxy_sni ? (Ustrcmp(continue_proxy_sni, sni) == 0) : !*sni))
2151 tls_out.sni = US sni;
2156 debug_printf("Closing proxied-TLS connection due to SNI mismatch\n");
2158 smtp_debug_cmd(US"QUIT", 0);
2159 write(0, "QUIT\r\n", 6);
2161 continue_hostname = continue_proxy_cipher = NULL;
2162 f.continue_more = FALSE;
2163 continue_sequence = 1; /* Unfortunately, this process cannot affect success log
2164 which is done by delivery proc. Would have to pass this
2165 back through reporting pipe. */
2168 #endif /*!DISABLE_TLS*/
2170 /* Make a connection to the host if this isn't a continued delivery, and handle
2171 the initial interaction and HELO/EHLO/LHLO. Connect timeout errors are handled
2172 specially so they can be identified for retries. */
2174 if (!continue_hostname)
2177 HDEBUG(D_verify) debug_printf("interface=%s port=%d\n", sx->conn_args.interface, sx->port);
2179 /* Arrange to report to calling process this is a new connection */
2181 clearflag(sx->first_addr, af_cont_conn);
2182 setflag(sx->first_addr, af_new_conn);
2184 /* Get the actual port the connection will use, into sx->conn_args.host */
2186 smtp_port_for_connect(sx->conn_args.host, sx->port);
2189 /* Do TLSA lookup for DANE */
2191 tls_out.dane_verified = FALSE;
2192 tls_out.tlsa_usage = 0;
2194 if (sx->conn_args.host->dnssec == DS_YES)
2197 if( sx->dane_required
2198 || verify_check_given_host(CUSS &ob->hosts_try_dane, sx->conn_args.host) == OK
2200 switch (rc = tlsa_lookup(sx->conn_args.host, &sx->conn_args.tlsa_dnsa, sx->dane_required))
2202 case OK: sx->conn_args.dane = TRUE;
2203 ob->tls_tempfail_tryclear = FALSE; /* force TLS */
2204 ob->tls_sni = sx->conn_args.host->name; /* force SNI */
2206 case FAIL_FORCED: break;
2207 default: set_errno_nohost(sx->addrlist, ERRNO_DNSDEFER,
2208 string_sprintf("DANE error: tlsa lookup %s",
2210 rc, FALSE, &sx->delivery_start);
2211 # ifndef DISABLE_EVENT
2212 (void) event_raise(sx->conn_args.tblock->event_action,
2213 US"dane:fail", sx->dane_required
2214 ? US"dane-required" : US"dnssec-invalid",
2220 else if (sx->dane_required)
2222 set_errno_nohost(sx->addrlist, ERRNO_DNSDEFER,
2223 string_sprintf("DANE error: %s lookup not DNSSEC", sx->conn_args.host->name),
2224 FAIL, FALSE, &sx->delivery_start);
2225 # ifndef DISABLE_EVENT
2226 (void) event_raise(sx->conn_args.tblock->event_action,
2227 US"dane:fail", US"dane-required", NULL);
2234 /* Make the TCP connection */
2236 sx->cctx.tls_ctx = NULL;
2237 sx->inblock.cctx = sx->outblock.cctx = &sx->cctx;
2238 #ifdef EXPERIMENTAL_ESMTP_LIMITS
2239 sx->peer_limit_mail = sx->peer_limit_rcpt = sx->peer_limit_rcptdom =
2241 sx->avoid_option = sx->peer_offered = smtp_peer_options = 0;
2242 #ifndef DISABLE_CLIENT_CMD_LOG
2243 client_cmd_log = NULL;
2246 #ifndef DISABLE_PIPE_CONNECT
2247 if ( verify_check_given_host(CUSS &ob->hosts_pipe_connect,
2248 sx->conn_args.host) == OK)
2250 /* We don't find out the local ip address until the connect, so if
2251 the helo string might use it avoid doing early-pipelining. */
2254 || sx->conn_args.interface
2255 || !Ustrstr(sx->helo_data, "$sending_ip_address")
2256 || Ustrstr(sx->helo_data, "def:sending_ip_address")
2259 sx->early_pipe_ok = TRUE;
2260 if ( read_ehlo_cache_entry(sx)
2261 && sx->ehlo_resp.cleartext_features & OPTION_EARLY_PIPE)
2264 debug_printf("Using cached cleartext PIPECONNECT\n");
2265 sx->early_pipe_active = TRUE;
2266 sx->peer_offered = sx->ehlo_resp.cleartext_features;
2269 else DEBUG(D_transport)
2270 debug_printf("helo needs $sending_ip_address; avoid early-pipelining\n");
2273 if (sx->early_pipe_active)
2275 sx->outblock.conn_args = &sx->conn_args;
2276 (void) smtp_boundsock(&sx->conn_args);
2281 blob lazy_conn = {.data = NULL};
2282 /* For TLS-connect, a TFO lazy-connect is useful since the Client Hello
2283 can go on the TCP SYN. */
2285 if ((sx->cctx.sock = smtp_connect(&sx->conn_args,
2286 sx->smtps ? &lazy_conn : NULL)) < 0)
2288 set_errno_nohost(sx->addrlist,
2289 errno == ETIMEDOUT ? ERRNO_CONNECTTIMEOUT : errno,
2290 sx->verify ? US strerror(errno) : NULL,
2291 DEFER, FALSE, &sx->delivery_start);
2292 sx->send_quit = FALSE;
2296 (void) setsockopt(sx->cctx.sock, IPPROTO_TCP, TCP_QUICKACK, US &off,
2300 /* Expand the greeting message while waiting for the initial response. (Makes
2301 sense if helo_data contains ${lookup dnsdb ...} stuff). The expansion is
2302 delayed till here so that $sending_ip_address and $sending_port are set.
2303 Those will be known even for a TFO lazy-connect, having been set by the bind().
2304 For early-pipe, we are ok if binding to a local interface; otherwise (if
2305 $sending_ip_address is seen in helo_data) we disabled early-pipe above. */
2308 if (!(sx->helo_data = expand_string(sx->helo_data)))
2310 log_write(0, LOG_MAIN|LOG_PANIC,
2311 "<%s>: failed to expand transport's helo_data value for callout: %s",
2312 sx->addrlist->address, expand_string_message);
2317 expand_string_message = NULL;
2318 if ((sx->helo_data = string_domain_utf8_to_alabel(sx->helo_data,
2319 &expand_string_message)),
2320 expand_string_message)
2322 log_write(0, LOG_MAIN|LOG_PANIC,
2323 "<%s>: failed to expand transport's helo_data value for callout: %s",
2324 sx->addrlist->address, expand_string_message);
2326 sx->helo_data = NULL;
2330 /* The first thing is to wait for an initial OK response. The dreaded "goto"
2331 is nevertheless a reasonably clean way of programming this kind of logic,
2332 where you want to escape on any error. */
2336 #ifndef DISABLE_PIPE_CONNECT
2337 if (sx->early_pipe_active)
2339 sx->pending_BANNER = TRUE; /* sync_responses() must eventually handle */
2340 sx->outblock.cmd_count = 1;
2345 if (!smtp_reap_banner(sx))
2346 goto RESPONSE_FAILED;
2349 #ifndef DISABLE_EVENT
2352 lookup_dnssec_authenticated = sx->conn_args.host->dnssec==DS_YES ? US"yes"
2353 : sx->conn_args.host->dnssec==DS_NO ? US"no" : NULL;
2354 s = event_raise(sx->conn_args.tblock->event_action, US"smtp:connect", sx->buffer, NULL);
2357 set_errno_nohost(sx->addrlist, ERRNO_EXPANDFAIL,
2358 string_sprintf("deferred by smtp:connect event expansion: %s", s),
2359 DEFER, FALSE, &sx->delivery_start);
2366 /* Now check if the helo_data expansion went well, and sign off cleanly if
2371 message = string_sprintf("failed to expand helo_data: %s",
2372 expand_string_message);
2373 set_errno_nohost(sx->addrlist, ERRNO_EXPANDFAIL, message, DEFER, FALSE, &sx->delivery_start);
2379 /** Debugging without sending a message
2380 sx->addrlist->transport_return = DEFER;
2384 /* Errors that occur after this point follow an SMTP command, which is
2385 left in big_buffer by smtp_write_command() for use in error messages. */
2387 smtp_command = big_buffer;
2389 /* Tell the remote who we are...
2391 February 1998: A convention has evolved that ESMTP-speaking MTAs include the
2392 string "ESMTP" in their greeting lines, so make Exim send EHLO if the
2393 greeting is of this form. The assumption was that the far end supports it
2394 properly... but experience shows that there are some that give 5xx responses,
2395 even though the banner includes "ESMTP" (there's a bloody-minded one that
2396 says "ESMTP not spoken here"). Cope with that case.
2398 September 2000: Time has passed, and it seems reasonable now to always send
2399 EHLO at the start. It is also convenient to make the change while installing
2402 July 2003: Joachim Wieland met a broken server that advertises "PIPELINING"
2403 but times out after sending MAIL FROM, RCPT TO and DATA all together. There
2404 would be no way to send out the mails, so there is now a host list
2405 "hosts_avoid_esmtp" that disables ESMTP for special hosts and solves the
2406 PIPELINING problem as well. Maybe it can also be useful to cure other
2407 problems with broken servers.
2409 Exim originally sent "Helo" at this point and ran for nearly a year that way.
2410 Then somebody tried it with a Microsoft mailer... It seems that all other
2411 mailers use upper case for some reason (the RFC is quite clear about case
2412 independence) so, for peace of mind, I gave in. */
2414 sx->esmtp = verify_check_given_host(CUSS &ob->hosts_avoid_esmtp, sx->conn_args.host) != OK;
2416 /* Alas; be careful, since this goto is not an error-out, so conceivably
2417 we might set data between here and the target which we assume to exist
2418 and be usable. I can see this coming back to bite us. */
2422 smtp_peer_options |= OPTION_TLS;
2423 suppress_tls = FALSE;
2424 ob->tls_tempfail_tryclear = FALSE;
2425 smtp_command = US"SSL-on-connect";
2432 if (smtp_write_command(sx,
2433 #ifndef DISABLE_PIPE_CONNECT
2434 sx->early_pipe_active ? SCMD_BUFFER :
2437 "%s %s\r\n", sx->lmtp ? "LHLO" : "EHLO", sx->helo_data) < 0)
2439 sx->esmtp_sent = TRUE;
2441 #ifndef DISABLE_PIPE_CONNECT
2442 if (sx->early_pipe_active)
2444 sx->pending_EHLO = TRUE;
2446 /* If we have too many authenticators to handle and might need to AUTH
2447 for this transport, pipeline no further as we will need the
2448 list of auth methods offered. Reap the banner and EHLO. */
2450 if ( (ob->hosts_require_auth || ob->hosts_try_auth)
2451 && f.smtp_in_early_pipe_no_auth)
2453 DEBUG(D_transport) debug_printf("may need to auth, so pipeline no further\n");
2454 if (smtp_write_command(sx, SCMD_FLUSH, NULL) < 0)
2456 if (sync_responses(sx, 2, 0) != 0)
2459 debug_printf("failed reaping pipelined cmd responses\n");
2460 goto RESPONSE_FAILED;
2462 sx->early_pipe_active = FALSE;
2467 if (!smtp_reap_ehlo(sx))
2468 goto RESPONSE_FAILED;
2472 debug_printf("not sending EHLO (host matches hosts_avoid_esmtp)\n");
2474 #ifndef DISABLE_PIPE_CONNECT
2475 if (!sx->early_pipe_active)
2480 int n = sizeof(sx->buffer);
2481 uschar * rsp = sx->buffer;
2483 if (sx->esmtp_sent && (n = Ustrlen(sx->buffer) + 1) < sizeof(sx->buffer)/2)
2484 { rsp = sx->buffer + n; n = sizeof(sx->buffer) - n; }
2486 if (smtp_write_command(sx, SCMD_FLUSH, "HELO %s\r\n", sx->helo_data) < 0)
2488 good_response = smtp_read_response(sx, rsp, n, '2', ob->command_timeout);
2489 #ifdef EXPERIMENTAL_DSN_INFO
2490 sx->helo_response = string_copy(rsp);
2494 /* Handle special logging for a closed connection after HELO
2495 when had previously sent EHLO */
2497 if (rsp != sx->buffer && rsp[0] == 0 && (errno == 0 || errno == ECONNRESET))
2499 errno = ERRNO_SMTPCLOSED;
2500 goto EHLOHELO_FAILED;
2502 memmove(sx->buffer, rsp, Ustrlen(rsp));
2503 goto RESPONSE_FAILED;
2507 if (sx->esmtp || sx->lmtp)
2509 #ifndef DISABLE_PIPE_CONNECT
2510 if (!sx->early_pipe_active)
2513 sx->peer_offered = ehlo_response(sx->buffer,
2514 OPTION_TLS /* others checked later */
2515 #ifndef DISABLE_PIPE_CONNECT
2516 | (sx->early_pipe_ok
2518 | OPTION_CHUNKING | OPTION_PRDR | OPTION_DSN | OPTION_PIPE | OPTION_SIZE
2527 #ifdef EXPERIMENTAL_ESMTP_LIMITS
2528 if (tls_out.active.sock >= 0 || !(sx->peer_offered & OPTION_TLS))
2530 ehlo_response_limits_read(sx);
2531 ehlo_response_limits_apply(sx);
2534 #ifndef DISABLE_PIPE_CONNECT
2535 if (sx->early_pipe_ok)
2537 sx->ehlo_resp.cleartext_features = sx->peer_offered;
2539 if ( (sx->peer_offered & (OPTION_PIPE | OPTION_EARLY_PIPE))
2540 == (OPTION_PIPE | OPTION_EARLY_PIPE))
2542 DEBUG(D_transport) debug_printf("PIPE_CONNECT usable in future for this IP\n");
2543 sx->ehlo_resp.cleartext_auths = study_ehlo_auths(sx);
2544 write_ehlo_cache_entry(sx);
2550 /* Set tls_offered if the response to EHLO specifies support for STARTTLS. */
2553 smtp_peer_options |= sx->peer_offered & OPTION_TLS;
2558 /* For continuing deliveries down the same channel, having re-exec'd the socket
2559 is the standard input; for a socket held open from verify it is recorded
2560 in the cutthrough context block. Either way we don't need to redo EHLO here
2561 (but may need to do so for TLS - see below).
2562 Set up the pointer to where subsequent commands will be left, for
2563 error messages. Note that smtp_peer_options will have been
2564 set from the command line if they were set in the process that passed the
2567 /*XXX continue case needs to propagate DSN_INFO, prob. in deliver.c
2568 as the continue goes via transport_pass_socket() and doublefork and exec.
2569 It does not wait. Unclear how we keep separate host's responses
2570 separate - we could match up by host ip+port as a bodge. */
2574 if (cutthrough.cctx.sock >= 0 && cutthrough.callout_hold_only)
2576 sx->cctx = cutthrough.cctx;
2577 sx->conn_args.host->port = sx->port = cutthrough.host.port;
2581 sx->cctx.sock = 0; /* stdin */
2582 sx->cctx.tls_ctx = NULL;
2583 smtp_port_for_connect(sx->conn_args.host, sx->port); /* Record the port that was used */
2585 sx->inblock.cctx = sx->outblock.cctx = &sx->cctx;
2586 smtp_command = big_buffer;
2587 sx->peer_offered = smtp_peer_options;
2588 #ifdef EXPERIMENTAL_ESMTP_LIMITS
2589 /* Limits passed by cmdline over exec. */
2590 ehlo_limits_apply(sx,
2591 sx->peer_limit_mail = continue_limit_mail,
2592 sx->peer_limit_rcpt = continue_limit_rcpt,
2593 sx->peer_limit_rcptdom = continue_limit_rcptdom);
2595 sx->helo_data = NULL; /* ensure we re-expand ob->helo_data */
2597 /* For a continued connection with TLS being proxied for us, or a
2598 held-open verify connection with TLS, nothing more to do. */
2600 if ( continue_proxy_cipher
2601 || (cutthrough.cctx.sock >= 0 && cutthrough.callout_hold_only
2602 && cutthrough.is_tls)
2605 sx->pipelining_used = pipelining_active = !!(smtp_peer_options & OPTION_PIPE);
2606 HDEBUG(D_transport) debug_printf("continued connection, %s TLS\n",
2607 continue_proxy_cipher ? "proxied" : "verify conn with");
2610 HDEBUG(D_transport) debug_printf("continued connection, no TLS\n");
2613 /* If TLS is available on this connection, whether continued or not, attempt to
2614 start up a TLS session, unless the host is in hosts_avoid_tls. If successful,
2615 send another EHLO - the server may give a different answer in secure mode. We
2616 use a separate buffer for reading the response to STARTTLS so that if it is
2617 negative, the original EHLO data is available for subsequent analysis, should
2618 the client not be required to use TLS. If the response is bad, copy the buffer
2619 for error analysis. */
2622 if ( smtp_peer_options & OPTION_TLS
2624 && verify_check_given_host(CUSS &ob->hosts_avoid_tls, sx->conn_args.host) != OK
2626 || verify_check_given_host(CUSS &ob->hosts_verify_avoid_tls, sx->conn_args.host) != OK
2629 uschar buffer2[4096];
2631 if (smtp_write_command(sx, SCMD_FLUSH, "STARTTLS\r\n") < 0)
2634 #ifndef DISABLE_PIPE_CONNECT
2635 /* If doing early-pipelining reap the banner and EHLO-response but leave
2636 the response for the STARTTLS we just sent alone. On fail, assume wrong
2637 cached capability and retry with the pipelining disabled. */
2639 if (sx->early_pipe_active && sync_responses(sx, 2, 0) != 0)
2642 debug_printf("failed reaping pipelined cmd responses\n");
2643 close(sx->cctx.sock);
2645 sx->early_pipe_active = FALSE;
2646 goto PIPE_CONNECT_RETRY;
2650 /* If there is an I/O error, transmission of this message is deferred. If
2651 there is a temporary rejection of STARRTLS and tls_tempfail_tryclear is
2652 false, we also defer. However, if there is a temporary rejection of STARTTLS
2653 and tls_tempfail_tryclear is true, or if there is an outright rejection of
2654 STARTTLS, we carry on. This means we will try to send the message in clear,
2655 unless the host is in hosts_require_tls (tested below). */
2657 if (!smtp_read_response(sx, buffer2, sizeof(buffer2), '2', ob->command_timeout))
2661 || (buffer2[0] == '4' && !ob->tls_tempfail_tryclear)
2664 Ustrncpy(sx->buffer, buffer2, sizeof(sx->buffer));
2665 sx->buffer[sizeof(sx->buffer)-1] = '\0';
2666 goto RESPONSE_FAILED;
2670 /* STARTTLS accepted: try to negotiate a TLS session. */
2675 if (!tls_client_start(&sx->cctx, &sx->conn_args, sx->addrlist, &tls_out, &tls_errstr))
2677 /* TLS negotiation failed; give an error. From outside, this function may
2678 be called again to try in clear on a new connection, if the options permit
2679 it for this host. */
2681 DEBUG(D_tls) debug_printf("TLS session fail: %s\n", tls_errstr);
2683 # ifdef SUPPORT_DANE
2684 if (sx->conn_args.dane)
2686 log_write(0, LOG_MAIN,
2687 "DANE attempt failed; TLS connection to %s [%s]: %s",
2688 sx->conn_args.host->name, sx->conn_args.host->address, tls_errstr);
2689 # ifndef DISABLE_EVENT
2690 (void) event_raise(sx->conn_args.tblock->event_action,
2691 US"dane:fail", US"validation-failure", NULL); /* could do with better detail */
2696 errno = ERRNO_TLSFAILURE;
2697 message = string_sprintf("TLS session: %s", tls_errstr);
2698 sx->send_quit = FALSE;
2701 sx->send_tlsclose = TRUE;
2703 /* TLS session is set up. Check the inblock fill level. If there is
2704 content then as we have not yet done a tls read it must have arrived before
2705 the TLS handshake, in-clear. That violates the sync requirement of the
2706 STARTTLS RFC, so fail. */
2708 if (sx->inblock.ptr != sx->inblock.ptrend)
2712 int i = sx->inblock.ptrend - sx->inblock.ptr;
2713 debug_printf("unused data in input buffer after ack for STARTTLS:\n"
2715 i > 100 ? 100 : i, sx->inblock.ptr, i > 100 ? "..." : "");
2717 tls_errstr = US"synch error before connect";
2718 goto TLS_CONN_FAILED;
2721 smtp_peer_options_wrap = smtp_peer_options;
2722 for (address_item * addr = sx->addrlist; addr; addr = addr->next)
2723 if (addr->transport_return == PENDING_DEFER)
2725 addr->cipher = tls_out.cipher;
2726 addr->ourcert = tls_out.ourcert;
2727 addr->peercert = tls_out.peercert;
2728 addr->peerdn = tls_out.peerdn;
2729 addr->ocsp = tls_out.ocsp;
2730 addr->tlsver = tls_out.ver;
2735 /* if smtps, we'll have smtp_command set to something else; always safe to
2737 smtp_command = big_buffer;
2739 /* If we started TLS, redo the EHLO/LHLO exchange over the secure channel. If
2740 helo_data is null, we are dealing with a connection that was passed from
2741 another process, and so we won't have expanded helo_data above. We have to
2742 expand it here. $sending_ip_address and $sending_port are set up right at the
2743 start of the Exim process (in exim.c). */
2745 if (tls_out.active.sock >= 0)
2747 uschar * greeting_cmd;
2749 if (!sx->helo_data && !(sx->helo_data = expand_string(ob->helo_data)))
2751 uschar *message = string_sprintf("failed to expand helo_data: %s",
2752 expand_string_message);
2753 set_errno_nohost(sx->addrlist, ERRNO_EXPANDFAIL, message, DEFER, FALSE, &sx->delivery_start);
2758 #ifndef DISABLE_PIPE_CONNECT
2759 /* For SMTPS there is no cleartext early-pipe; use the crypted permission bit.
2760 We're unlikely to get the group sent and delivered before the server sends its
2761 banner, but it's still worth sending as a group.
2762 For STARTTLS allow for cleartext early-pipe but no crypted early-pipe, but not
2765 if (sx->smtps ? sx->early_pipe_ok : sx->early_pipe_active)
2767 sx->peer_offered = sx->ehlo_resp.crypted_features;
2768 if ((sx->early_pipe_active =
2769 !!(sx->ehlo_resp.crypted_features & OPTION_EARLY_PIPE)))
2770 DEBUG(D_transport) debug_printf("Using cached crypted PIPECONNECT\n");
2773 #ifdef EXPERIMMENTAL_ESMTP_LIMITS
2774 /* As we are about to send another EHLO, forget any LIMITS received so far. */
2775 sx->peer_limit_mail = sx->peer_limit_rcpt = sx->peer_limit_rcptdom = 0;
2776 if ((sx->max_mail = sx->conn_args.tblock->connection_max_message) == 0) sx->max_mail = 999999;
2777 if ((sx->max_rcpt = sx->conn_args.tblock->max_addresses) == 0) sx->max_rcpt = 999999;
2778 sx->single_rcpt_domain = FALSE;
2781 /* For SMTPS we need to wait for the initial OK response. */
2783 #ifndef DISABLE_PIPE_CONNECT
2784 if (sx->early_pipe_active)
2786 sx->pending_BANNER = TRUE;
2787 sx->outblock.cmd_count = 1;
2791 if (!smtp_reap_banner(sx))
2792 goto RESPONSE_FAILED;
2795 greeting_cmd = US"LHLO";
2797 greeting_cmd = US"EHLO";
2800 greeting_cmd = US"HELO";
2802 debug_printf("not sending EHLO (host matches hosts_avoid_esmtp)\n");
2805 if (smtp_write_command(sx,
2806 #ifndef DISABLE_PIPE_CONNECT
2807 sx->early_pipe_active ? SCMD_BUFFER :
2810 "%s %s\r\n", greeting_cmd, sx->helo_data) < 0)
2813 #ifndef DISABLE_PIPE_CONNECT
2814 if (sx->early_pipe_active)
2815 sx->pending_EHLO = TRUE;
2819 if (!smtp_reap_ehlo(sx))
2822 /* The GnuTLS layer in Exim only spots a server-rejection of a client
2823 cert late, under TLS1.3 - which means here; the first time we try to
2824 receive crypted data. Treat it as if it was a connect-time failure.
2825 See also the early-pipe equivalent... which will be hard; every call
2826 to sync_responses will need to check the result.
2827 It would be nicer to have GnuTLS check the cert during the handshake.
2828 Can it do that, with all the flexibility we need? */
2830 tls_errstr = US"error on first read";
2831 goto TLS_CONN_FAILED;
2834 goto RESPONSE_FAILED;
2836 smtp_peer_options = 0;
2840 /* If the host is required to use a secure channel, ensure that we
2844 # ifdef SUPPORT_DANE
2845 || sx->conn_args.dane
2847 || verify_check_given_host(CUSS &ob->hosts_require_tls, sx->conn_args.host) == OK
2850 errno = ERRNO_TLSREQUIRED;
2851 message = string_sprintf("a TLS session is required, but %s",
2852 smtp_peer_options & OPTION_TLS
2853 ? "an attempt to start TLS failed" : "the server did not offer TLS support");
2854 # if defined(SUPPORT_DANE) && !defined(DISABLE_EVENT)
2855 if (sx->conn_args.dane)
2856 (void) event_raise(sx->conn_args.tblock->event_action, US"dane:fail",
2857 smtp_peer_options & OPTION_TLS
2858 ? US"validation-failure" /* could do with better detail */
2859 : US"starttls-not-supported",
2864 #endif /*DISABLE_TLS*/
2866 /* If TLS is active, we have just started it up and re-done the EHLO command,
2867 so its response needs to be analyzed. If TLS is not active and this is a
2868 continued session down a previously-used socket, we haven't just done EHLO, so
2871 if ( !continue_hostname
2873 || tls_out.active.sock >= 0
2877 if (sx->esmtp || sx->lmtp)
2879 #ifndef DISABLE_PIPE_CONNECT
2880 if (!sx->early_pipe_active)
2883 sx->peer_offered = ehlo_response(sx->buffer,
2885 #ifndef DISABLE_PIPE_CONNECT
2886 | (sx->lmtp && ob->lmtp_ignore_quota ? OPTION_IGNQ : 0)
2887 | OPTION_DSN | OPTION_PIPE | OPTION_SIZE
2888 | OPTION_CHUNKING | OPTION_PRDR | OPTION_UTF8
2889 | (tls_out.active.sock >= 0 ? OPTION_EARLY_PIPE : 0) /* not for lmtp */
2893 | (sx->lmtp && ob->lmtp_ignore_quota ? OPTION_IGNQ : 0)
2896 # ifdef SUPPORT_I18N
2897 | (sx->addrlist->prop.utf8_msg ? OPTION_UTF8 : 0)
2898 /*XXX if we hand peercaps on to continued-conn processes,
2899 must not depend on this addr */
2903 | (ob->size_addition >= 0 ? OPTION_SIZE : 0)
2906 #ifndef DISABLE_PIPE_CONNECT
2907 if (tls_out.active.sock >= 0)
2908 sx->ehlo_resp.crypted_features = sx->peer_offered;
2911 #ifdef EXPERIMENTAL_ESMTP_LIMITS
2912 if (tls_out.active.sock >= 0 || !(sx->peer_offered & OPTION_TLS))
2914 ehlo_response_limits_read(sx);
2915 ehlo_response_limits_apply(sx);
2920 /* Set for IGNOREQUOTA if the response to LHLO specifies support and the
2921 lmtp_ignore_quota option was set. */
2923 sx->igquotstr = sx->peer_offered & OPTION_IGNQ ? US" IGNOREQUOTA" : US"";
2925 /* If the response to EHLO specified support for the SIZE parameter, note
2926 this, provided size_addition is non-negative. */
2928 smtp_peer_options |= sx->peer_offered & OPTION_SIZE;
2930 /* Note whether the server supports PIPELINING. If hosts_avoid_esmtp matched
2931 the current host, esmtp will be false, so PIPELINING can never be used. If
2932 the current host matches hosts_avoid_pipelining, don't do it. */
2934 if ( sx->peer_offered & OPTION_PIPE
2935 && verify_check_given_host(CUSS &ob->hosts_avoid_pipelining, sx->conn_args.host) != OK)
2936 smtp_peer_options |= OPTION_PIPE;
2938 DEBUG(D_transport) debug_printf("%susing PIPELINING\n",
2939 smtp_peer_options & OPTION_PIPE ? "" : "not ");
2941 if ( sx->peer_offered & OPTION_CHUNKING
2942 && verify_check_given_host(CUSS &ob->hosts_try_chunking, sx->conn_args.host) == OK)
2943 smtp_peer_options |= OPTION_CHUNKING;
2945 if (smtp_peer_options & OPTION_CHUNKING)
2946 DEBUG(D_transport) debug_printf("CHUNKING usable\n");
2948 #ifndef DISABLE_PRDR
2949 if ( sx->peer_offered & OPTION_PRDR
2950 && verify_check_given_host(CUSS &ob->hosts_try_prdr, sx->conn_args.host) == OK)
2951 smtp_peer_options |= OPTION_PRDR;
2953 if (smtp_peer_options & OPTION_PRDR)
2954 DEBUG(D_transport) debug_printf("PRDR usable\n");
2957 /* Note if the server supports DSN */
2958 smtp_peer_options |= sx->peer_offered & OPTION_DSN;
2959 DEBUG(D_transport) debug_printf("%susing DSN\n",
2960 sx->peer_offered & OPTION_DSN ? "" : "not ");
2962 #ifndef DISABLE_PIPE_CONNECT
2963 if ( sx->early_pipe_ok
2964 && !sx->early_pipe_active
2965 && tls_out.active.sock >= 0
2966 && smtp_peer_options & OPTION_PIPE
2967 && ( sx->ehlo_resp.cleartext_features | sx->ehlo_resp.crypted_features)
2968 & OPTION_EARLY_PIPE)
2970 DEBUG(D_transport) debug_printf("PIPECONNECT usable in future for this IP\n");
2971 sx->ehlo_resp.crypted_auths = study_ehlo_auths(sx);
2972 write_ehlo_cache_entry(sx);
2976 /* Note if the response to EHLO specifies support for the AUTH extension.
2977 If it has, check that this host is one we want to authenticate to, and do
2978 the business. The host name and address must be available when the
2979 authenticator's client driver is running. */
2981 switch (yield = smtp_auth(sx))
2983 default: goto SEND_QUIT;
2985 case FAIL_SEND: goto SEND_FAILED;
2986 case FAIL: goto RESPONSE_FAILED;
2990 sx->pipelining_used = pipelining_active = !!(smtp_peer_options & OPTION_PIPE);
2992 /* The setting up of the SMTP call is now complete. Any subsequent errors are
2993 message-specific. */
2995 sx->setting_up = FALSE;
2998 if (sx->addrlist->prop.utf8_msg)
3002 /* If the transport sets a downconversion mode it overrides any set by ACL
3005 if ((s = ob->utf8_downconvert))
3007 if (!(s = expand_string(s)))
3009 message = string_sprintf("failed to expand utf8_downconvert: %s",
3010 expand_string_message);
3011 set_errno_nohost(sx->addrlist, ERRNO_EXPANDFAIL, message, DEFER, FALSE, &sx->delivery_start);
3017 case '1': sx->addrlist->prop.utf8_downcvt = TRUE;
3018 sx->addrlist->prop.utf8_downcvt_maybe = FALSE;
3020 case '0': sx->addrlist->prop.utf8_downcvt = FALSE;
3021 sx->addrlist->prop.utf8_downcvt_maybe = FALSE;
3023 case '-': if (s[1] == '1')
3025 sx->addrlist->prop.utf8_downcvt = FALSE;
3026 sx->addrlist->prop.utf8_downcvt_maybe = TRUE;
3032 sx->utf8_needed = !sx->addrlist->prop.utf8_downcvt
3033 && !sx->addrlist->prop.utf8_downcvt_maybe;
3034 DEBUG(D_transport) if (!sx->utf8_needed)
3035 debug_printf("utf8: %s downconvert\n",
3036 sx->addrlist->prop.utf8_downcvt ? "mandatory" : "optional");
3039 /* If this is an international message we need the host to speak SMTPUTF8 */
3040 if (sx->utf8_needed && !(sx->peer_offered & OPTION_UTF8))
3042 errno = ERRNO_UTF8_FWD;
3043 goto RESPONSE_FAILED;
3045 #endif /*SUPPORT_I18N*/
3054 if (errno == ECONNREFUSED) /* first-read error on a TFO conn */
3056 /* There is a testing facility for simulating a connection timeout, as I
3057 can't think of any other way of doing this. It converts a connection
3058 refused into a timeout if the timeout is set to 999999. This is done for
3059 a 3whs connection in ip_connect(), but a TFO connection does not error
3060 there - instead it gets ECONNREFUSED on the first data read. Tracking
3061 that a TFO really was done is too hard, or we would set a
3062 sx->pending_conn_done bit and test that in smtp_reap_banner() and
3063 smtp_reap_ehlo(). That would let us also add the conn-timeout to the
3066 if (f.running_in_test_harness && ob->connect_timeout == 999999)
3068 set_errno_nohost(sx->addrlist,
3069 errno == ETIMEDOUT ? ERRNO_CONNECTTIMEOUT : errno,
3070 sx->verify ? US strerror(errno) : NULL,
3071 DEFER, FALSE, &sx->delivery_start);
3072 sx->send_quit = FALSE;
3076 /* really an error on an SMTP read */
3078 sx->send_quit = check_response(sx->conn_args.host, &errno, sx->addrlist->more_errno,
3079 sx->buffer, &code, &message, &pass_message);
3085 message = US string_sprintf("smtp send to %s [%s] failed: %s",
3086 sx->conn_args.host->name, sx->conn_args.host->address, strerror(errno));
3087 sx->send_quit = FALSE;
3093 message = string_sprintf("Remote host closed connection in response to %s"
3094 " (EHLO response was: %s)", smtp_command, sx->buffer);
3095 sx->send_quit = FALSE;
3099 /* This label is jumped to directly when a TLS negotiation has failed,
3100 or was not done for a host for which it is required. Values will be set
3101 in message and errno, and setting_up will always be true. Treat as
3102 a temporary error. */
3106 code = '4', yield = DEFER;
3110 /* The failure happened while setting up the call; see if the failure was
3111 a 5xx response (this will either be on connection, or following HELO - a 5xx
3112 after EHLO causes it to try HELO). If so, and there are no more hosts to try,
3113 fail all addresses, as this host is never going to accept them. For other
3114 errors during setting up (timeouts or whatever), defer all addresses, and
3115 yield DEFER, so that the host is not tried again for a while.
3117 XXX This peeking for another host feels like a layering violation. We want
3118 to note the host as unusable, but down here we shouldn't know if this was
3119 the last host to try for the addr(list). Perhaps the upper layer should be
3120 the one to do set_errno() ? The problem is that currently the addr is where
3121 errno etc. are stashed, but until we run out of hosts to try the errors are
3122 host-specific. Maybe we should enhance the host_item definition? */
3125 sx->ok = FALSE; /* For when reached by GOTO */
3126 set_errno(sx->addrlist, errno, message,
3127 sx->conn_args.host->next
3131 || errno == ERRNO_UTF8_FWD
3135 errno == ECONNREFUSED ? NULL : sx->conn_args.host,
3136 #ifdef EXPERIMENTAL_DSN_INFO
3137 sx->smtp_greeting, sx->helo_response,
3139 &sx->delivery_start);
3146 (void)smtp_write_command(sx, SCMD_FLUSH, "QUIT\r\n");
3149 if (sx->cctx.tls_ctx)
3151 if (sx->send_tlsclose)
3153 tls_close(sx->cctx.tls_ctx, TLS_SHUTDOWN_NOWAIT);
3154 sx->send_tlsclose = FALSE;
3156 sx->cctx.tls_ctx = NULL;
3160 /* Close the socket, and return the appropriate value, first setting
3161 works because the NULL setting is passed back to the calling process, and
3162 remote_max_parallel is forced to 1 when delivering over an existing connection,
3165 HDEBUG(D_transport|D_acl|D_v) debug_printf_indent(" SMTP(close)>>\n");
3168 shutdown(sx->cctx.sock, SHUT_WR);
3169 if (fcntl(sx->cctx.sock, F_SETFL, O_NONBLOCK) == 0)
3170 for (int i = 16; read(sx->cctx.sock, sx->inbuffer, sizeof(sx->inbuffer)) > 0 && i > 0;)
3171 i--; /* drain socket */
3172 sx->send_quit = FALSE;
3174 (void)close(sx->cctx.sock);
3177 #ifndef DISABLE_EVENT
3178 (void) event_raise(sx->conn_args.tblock->event_action, US"tcp:close", NULL, NULL);
3181 smtp_debug_cmd_report();
3182 continue_transport = NULL;
3183 continue_hostname = NULL;
3190 /* Create the string of options that will be appended to the MAIL FROM:
3191 in the connection context buffer */
3194 build_mailcmd_options(smtp_context * sx, address_item * addrlist)
3196 uschar * p = sx->buffer;
3197 address_item * addr;
3202 /* If we know the receiving MTA supports the SIZE qualification, and we know it,
3203 send it, adding something to the message size to allow for imprecision
3204 and things that get added en route. Exim keeps the number of lines
3205 in a message, so we can give an accurate value for the original message, but we
3206 need some additional to handle added headers. (Double "." characters don't get
3207 included in the count.) */
3209 if ( message_size > 0
3210 && sx->peer_offered & OPTION_SIZE && !(sx->avoid_option & OPTION_SIZE))
3212 /*XXX problem here under spool_files_wireformat?
3213 Or just forget about lines? Or inflate by a fixed proportion? */
3215 sprintf(CS p, " SIZE=%d", message_size+message_linecount+(SOB sx->conn_args.ob)->size_addition);
3219 #ifndef DISABLE_PRDR
3220 /* If it supports Per-Recipient Data Responses, and we have more than one recipient,
3223 sx->prdr_active = FALSE;
3224 if (smtp_peer_options & OPTION_PRDR)
3225 for (address_item * addr = addrlist; addr; addr = addr->next)
3226 if (addr->transport_return == PENDING_DEFER)
3228 for (addr = addr->next; addr; addr = addr->next)
3229 if (addr->transport_return == PENDING_DEFER)
3230 { /* at least two recipients to send */
3231 sx->prdr_active = TRUE;
3232 sprintf(CS p, " PRDR"); p += 5;
3240 /* If it supports internationalised messages, and this meesage need that,
3243 if ( sx->peer_offered & OPTION_UTF8
3244 && addrlist->prop.utf8_msg
3245 && !addrlist->prop.utf8_downcvt
3247 Ustrcpy(p, US" SMTPUTF8"), p += 9;
3250 /* check if all addresses have DSN-lasthop flag; do not send RET and ENVID if so */
3251 for (sx->dsn_all_lasthop = TRUE, addr = addrlist, address_count = 0;
3252 addr && address_count < sx->max_rcpt; /*XXX maybe also || sx->single_rcpt_domain ? */
3253 addr = addr->next) if (addr->transport_return == PENDING_DEFER)
3256 if (!(addr->dsn_flags & rf_dsnlasthop))
3258 sx->dsn_all_lasthop = FALSE;
3263 /* Add any DSN flags to the mail command */
3265 if (sx->peer_offered & OPTION_DSN && !sx->dsn_all_lasthop)
3267 if (dsn_ret == dsn_ret_hdrs)
3268 { Ustrcpy(p, US" RET=HDRS"); p += 9; }
3269 else if (dsn_ret == dsn_ret_full)
3270 { Ustrcpy(p, US" RET=FULL"); p += 9; }
3274 string_format(p, sizeof(sx->buffer) - (p-sx->buffer), " ENVID=%s", dsn_envid);
3279 /* If an authenticated_sender override has been specified for this transport
3280 instance, expand it. If the expansion is forced to fail, and there was already
3281 an authenticated_sender for this message, the original value will be used.
3282 Other expansion failures are serious. An empty result is ignored, but there is
3283 otherwise no check - this feature is expected to be used with LMTP and other
3284 cases where non-standard addresses (e.g. without domains) might be required. */
3286 return smtp_mail_auth_str(sx, p, addrlist) ? ERROR : OK;
3291 build_rcptcmd_options(smtp_context * sx, const address_item * addr)
3293 uschar * p = sx->buffer;
3296 /* Add any DSN flags to the rcpt command */
3298 if (sx->peer_offered & OPTION_DSN && !(addr->dsn_flags & rf_dsnlasthop))
3300 if (addr->dsn_flags & rf_dsnflags)
3304 Ustrcpy(p, US" NOTIFY=");
3306 for (int i = 0; i < nelem(rf_list); i++) if (addr->dsn_flags & rf_list[i])
3308 if (!first) *p++ = ',';
3310 Ustrcpy(p, rf_names[i]);
3315 if (addr->dsn_orcpt)
3317 string_format(p, sizeof(sx->buffer) - (p-sx->buffer), " ORCPT=%s",
3328 0 good, rcpt results in addr->transport_return (PENDING_OK, DEFER, FAIL)
3329 -1 MAIL response error
3330 -2 any non-MAIL read i/o error
3331 -3 non-MAIL response timeout
3332 -4 internal error; channel still usable
3337 smtp_write_mail_and_rcpt_cmds(smtp_context * sx, int * yield)
3339 address_item * addr;
3340 #ifdef EXPERIMENTAL_ESMTP_LIMITS
3341 address_item * restart_addr = NULL;
3343 int address_count, pipe_limit;
3346 if (build_mailcmd_options(sx, sx->first_addr) != OK)
3352 /* From here until we send the DATA command, we can make use of PIPELINING
3353 if the server host supports it. The code has to be able to check the responses
3354 at any point, for when the buffer fills up, so we write it totally generally.
3355 When PIPELINING is off, each command written reports that it has flushed the
3358 sx->pending_MAIL = TRUE; /* The block starts with MAIL */
3361 uschar * s = sx->from_addr;
3363 uschar * errstr = NULL;
3365 /* If we must downconvert, do the from-address here. Remember we had to
3366 for the to-addresses (done below), and also (ugly) for re-doing when building
3367 the delivery log line. */
3369 if ( sx->addrlist->prop.utf8_msg
3370 && (sx->addrlist->prop.utf8_downcvt || !(sx->peer_offered & OPTION_UTF8))
3373 if (s = string_address_utf8_to_alabel(s, &errstr), errstr)
3375 set_errno_nohost(sx->addrlist, ERRNO_EXPANDFAIL, errstr, DEFER, FALSE, &sx->delivery_start);
3379 setflag(sx->addrlist, af_utf8_downcvt);
3383 rc = smtp_write_command(sx, pipelining_active ? SCMD_BUFFER : SCMD_FLUSH,
3384 "MAIL FROM:<%s>%s\r\n", s, sx->buffer);
3387 mail_command = string_copy(big_buffer); /* Save for later error message */
3391 case -1: /* Transmission error */
3394 case +1: /* Cmd was sent */
3395 if (!smtp_read_response(sx, sx->buffer, sizeof(sx->buffer), '2',
3396 (SOB sx->conn_args.ob)->command_timeout))
3398 if (errno == 0 && sx->buffer[0] == '4')
3400 errno = ERRNO_MAIL4XX;
3401 sx->addrlist->more_errno |= ((sx->buffer[1] - '0')*10 + sx->buffer[2] - '0') << 8;
3405 sx->pending_MAIL = FALSE;
3408 /* otherwise zero: command queued for pipeline */
3411 /* Pass over all the relevant recipient addresses for this host, which are the
3412 ones that have status PENDING_DEFER. If we are using PIPELINING, we can send
3413 several before we have to read the responses for those seen so far. This
3414 checking is done by a subroutine because it also needs to be done at the end.
3415 Send only up to max_rcpt addresses at a time, leaving next_addr pointing to
3416 the next one if not all are sent.
3418 In the MUA wrapper situation, we want to flush the PIPELINING buffer for the
3419 last address because we want to abort if any recipients have any kind of
3420 problem, temporary or permanent. We know that all recipient addresses will have
3421 the PENDING_DEFER status, because only one attempt is ever made, and we know
3422 that max_rcpt will be large, so all addresses will be done at once.
3424 For verify we flush the pipeline after any (the only) rcpt address. */
3426 for (addr = sx->first_addr, address_count = 0, pipe_limit = 100;
3427 addr && address_count < sx->max_rcpt;
3428 addr = addr->next) if (addr->transport_return == PENDING_DEFER)
3434 #ifdef EXPERIMENTAL_ESMTP_LIMITS
3435 if ( sx->single_rcpt_domain /* restriction on domains */
3436 && address_count > 0 /* not first being sent */
3437 && Ustrcmp(addr->domain, sx->first_addr->domain) != 0 /* dom diff from first */
3440 DEBUG(D_transport) debug_printf("skipping different domain %s\n", addr->domain);
3442 /* Ensure the smtp-response reaper does not think the address had a RCPT
3443 command sent for it. Reset to PENDING_DEFER in smtp_deliver(), where we
3444 goto SEND_MESSAGE. */
3446 addr->transport_return = SKIP;
3447 if (!restart_addr) restart_addr = addr; /* note restart point */
3448 continue; /* skip this one */
3452 addr->dsn_aware = sx->peer_offered & OPTION_DSN
3453 ? dsn_support_yes : dsn_support_no;
3456 if (pipe_limit-- <= 0)
3457 { no_flush = FALSE; pipe_limit = 100; }
3459 no_flush = pipelining_active && !sx->verify
3460 && (!mua_wrapper || addr->next && address_count < sx->max_rcpt);
3462 build_rcptcmd_options(sx, addr);
3464 /* Now send the RCPT command, and process outstanding responses when
3465 necessary. After a timeout on RCPT, we just end the function, leaving the
3466 yield as OK, because this error can often mean that there is a problem with
3467 just one address, so we don't want to delay the host. */
3469 rcpt_addr = transport_rcpt_address(addr, sx->conn_args.tblock->rcpt_include_affixes);
3472 if ( testflag(sx->addrlist, af_utf8_downcvt)
3473 && !(rcpt_addr = string_address_utf8_to_alabel(rcpt_addr, NULL))
3476 /*XXX could we use a per-address errstr here? Not fail the whole send? */
3477 errno = ERRNO_EXPANDFAIL;
3478 return -5; /*XXX too harsh? */
3482 cmds_sent = smtp_write_command(sx, no_flush ? SCMD_BUFFER : SCMD_FLUSH,
3483 "RCPT TO:<%s>%s%s\r\n", rcpt_addr, sx->igquotstr, sx->buffer);
3485 if (cmds_sent < 0) return -5;
3488 switch(sync_responses(sx, cmds_sent, 0))
3490 case 3: sx->ok = TRUE; /* 2xx & 5xx => OK & progress made */
3491 case 2: sx->completed_addr = TRUE; /* 5xx (only) => progress made */
3494 case 1: sx->ok = TRUE; /* 2xx (only) => OK, but if LMTP, */
3495 if (!sx->lmtp) /* can't tell about progress yet */
3496 sx->completed_addr = TRUE;
3497 case 0: /* No 2xx or 5xx, but no probs */
3498 /* If any RCPT got a 452 response then next_addr has been updated
3499 for restarting with a new MAIL on the same connection. Send no more
3500 RCPTs for this MAIL. */
3504 DEBUG(D_transport) debug_printf("seen 452 too-many-rcpts\n");
3505 sx->RCPT_452 = FALSE;
3506 /* sx->next_addr has been reset for fast_retry */
3511 case -1: return -3; /* Timeout on RCPT */
3512 case -2: return -2; /* non-MAIL read i/o error */
3513 default: return -1; /* any MAIL error */
3515 #ifndef DISABLE_PIPE_CONNECT
3516 case -4: return -1; /* non-2xx for pipelined banner or EHLO */
3517 case -5: return -1; /* TLS first-read error */
3521 } /* Loop for next address */
3523 #ifdef EXPERIMENTAL_ESMTP_LIMITS
3524 sx->next_addr = restart_addr ? restart_addr : addr;
3526 sx->next_addr = addr;
3533 /*****************************************************
3534 * Proxy TLS connection for another transport process *
3535 ******************************************************/
3537 Close the unused end of the pipe, fork once more, then use the given buffer
3538 as a staging area, and select on both the given fd and the TLS'd client-fd for
3539 data to read (per the coding in ip_recv() and fd_ready() this is legitimate).
3540 Do blocking full-size writes, and reads under a timeout. Once both input
3541 channels are closed, exit the process.
3545 buf space to use for buffering
3546 bufsiz size of buffer
3547 pfd pipe filedescriptor array; [0] is comms to proxied process
3548 timeout per-read timeout, seconds
3549 host hostname of remote
3555 smtp_proxy_tls(void * ct_ctx, uschar * buf, size_t bsize, int * pfd,
3556 int timeout, const uschar * host)
3558 struct pollfd p[2] = {{.fd = tls_out.active.sock, .events = POLLIN},
3559 {.fd = pfd[0], .events = POLLIN}};
3561 BOOL send_tls_shutdown = TRUE;
3563 string_sprintf("proxying TLS connection for continued transport to %s\n", host);
3566 if ((rc = exim_fork(US"tls-proxy")))
3567 _exit(rc < 0 ? EXIT_FAILURE : EXIT_SUCCESS);
3569 set_process_info(CCS s);
3573 time_t time_left = timeout;
3574 time_t time_start = time(NULL);
3579 rc = poll(p, 2, time_left * 1000);
3581 if (rc < 0 && errno == EINTR)
3582 if ((time_left -= time(NULL) - time_start) > 0) continue;
3586 DEBUG(D_transport) if (rc == 0) debug_printf("%s: timed out\n", __FUNCTION__);
3590 /* For errors where not readable, bomb out */
3592 if (p[0].revents & POLLERR || p[1].revents & POLLERR)
3594 DEBUG(D_transport) debug_printf("select: exceptional cond on %s fd\n",
3595 p[0].revents & POLLERR ? "tls" : "proxy");
3596 if (!(p[0].revents & POLLIN || p[1].events & POLLIN))
3598 DEBUG(D_transport) debug_printf("- but also readable; no exit yet\n");
3601 while (rc < 0 || !(p[0].revents & POLLIN || p[1].revents & POLLIN));
3603 /* handle inbound data */
3604 if (p[0].revents & POLLIN)
3605 if ((rc = tls_read(ct_ctx, buf, bsize)) <= 0) /* Expect -1 for EOF; */
3606 { /* that reaps the TLS Close Notify record */
3608 shutdown(pfd[0], SHUT_WR);
3612 for (int nbytes = 0; rc - nbytes > 0; nbytes += i)
3613 if ((i = write(pfd[0], buf + nbytes, rc - nbytes)) < 0) goto done;
3615 /* Handle outbound data. We cannot combine payload and the TLS-close
3616 due to the limitations of the (pipe) channel feeding us. Maybe use a unix-domain
3618 if (p[1].revents & POLLIN)
3619 if ((rc = read(pfd[0], buf, bsize)) <= 0)
3623 # ifdef EXIM_TCP_CORK /* Use _CORK to get TLS Close Notify in FIN segment */
3624 (void) setsockopt(tls_out.active.sock, IPPROTO_TCP, EXIM_TCP_CORK, US &on, sizeof(on));
3626 tls_shutdown_wr(ct_ctx);
3627 send_tls_shutdown = FALSE;
3628 shutdown(tls_out.active.sock, SHUT_WR);
3631 for (int nbytes = 0; rc - nbytes > 0; nbytes += i)
3632 if ((i = tls_write(ct_ctx, buf + nbytes, rc - nbytes, FALSE)) < 0)
3635 while (p[0].fd >= 0 || p[1].fd >= 0);
3638 if (send_tls_shutdown) tls_close(ct_ctx, TLS_SHUTDOWN_NOWAIT);
3640 testharness_pause_ms(100); /* let logging complete */
3641 exim_exit(EXIT_SUCCESS);
3646 /*************************************************
3647 * Deliver address list to given host *
3648 *************************************************/
3650 /* If continue_hostname is not null, we get here only when continuing to
3651 deliver down an existing channel. The channel was passed as the standard
3652 input. TLS is never active on a passed channel; the previous process either
3653 closes it down before passing the connection on, or inserts a TLS-proxy
3654 process and passes on a cleartext conection.
3656 Otherwise, we have to make a connection to the remote host, and do the
3657 initial protocol exchange.
3659 When running as an MUA wrapper, if the sender or any recipient is rejected,
3660 temporarily or permanently, we force failure for all recipients.
3663 addrlist chain of potential addresses to deliver; only those whose
3664 transport_return field is set to PENDING_DEFER are currently
3665 being processed; others should be skipped - they have either
3666 been delivered to an earlier host or IP address, or been
3667 failed by one of them.
3668 host host to deliver to
3669 host_af AF_INET or AF_INET6
3670 defport default TCP/IP port to use if host does not specify, in host
3672 interface interface to bind to, or NULL
3673 tblock transport instance block
3674 message_defer set TRUE if yield is OK, but all addresses were deferred
3675 because of a non-recipient, non-host failure, that is, a
3676 4xx response to MAIL FROM, DATA, or ".". This is a defer
3677 that is specific to the message.
3678 suppress_tls if TRUE, don't attempt a TLS connection - this is set for
3679 a second attempt after TLS initialization fails
3681 Returns: OK - the connection was made and the delivery attempted;
3682 the result for each address is in its data block.
3683 DEFER - the connection could not be made, or something failed
3684 while setting up the SMTP session, or there was a
3685 non-message-specific error, such as a timeout.
3686 ERROR - a filter command is specified for this transport,
3687 and there was a problem setting it up; OR helo_data
3688 or add_headers or authenticated_sender is specified
3689 for this transport, and the string failed to expand
3691 For all non-OK returns the first addr of the list carries the
3692 time taken for the attempt.
3696 smtp_deliver(address_item *addrlist, host_item *host, int host_af, int defport,
3697 uschar *interface, transport_instance *tblock,
3698 BOOL *message_defer, BOOL suppress_tls)
3700 smtp_transport_options_block * ob = SOB tblock->options_block;
3705 uschar *message = NULL;
3706 uschar new_message_id[MESSAGE_ID_LENGTH + 1];
3707 smtp_context * sx = store_get(sizeof(*sx), GET_TAINTED); /* tainted, for the data buffers */
3708 BOOL pass_message = FALSE;
3709 #ifdef EXPERIMENTAL_ESMTP_LIMITS
3710 BOOL mail_limit = FALSE;
3715 BOOL tcw_done = FALSE, tcw = FALSE;
3717 *message_defer = FALSE;
3719 memset(sx, 0, sizeof(*sx));
3720 sx->addrlist = addrlist;
3721 sx->conn_args.host = host;
3722 sx->conn_args.host_af = host_af;
3724 sx->conn_args.interface = interface;
3725 sx->helo_data = NULL;
3726 sx->conn_args.tblock = tblock;
3727 sx->conn_args.sock = -1;
3728 gettimeofday(&sx->delivery_start, NULL);
3729 sx->sync_addr = sx->first_addr = addrlist;
3736 /* Get the channel set up ready for a message, MAIL FROM being the next
3737 SMTP command to send. */
3739 if ((rc = smtp_setup_conn(sx, suppress_tls)) != OK)
3741 timesince(&addrlist->delivery_time, &sx->delivery_start);
3747 /* If the connection used DANE, ignore for now any addresses with incompatible
3748 domains. The SNI has to be the domain. Arrange a whole new TCP conn later,
3749 just in case only TLS isn't enough. */
3751 if (sx->conn_args.dane)
3753 const uschar * dane_domain = sx->first_addr->domain;
3755 for (address_item * a = sx->first_addr->next; a; a = a->next)
3756 if ( a->transport_return == PENDING_DEFER
3757 && Ustrcmp(dane_domain, a->domain) != 0)
3759 DEBUG(D_transport) debug_printf("DANE: holding %s for later\n", a->domain);
3761 a->transport_return = DANE;
3766 /* If there is a filter command specified for this transport, we can now
3767 set it up. This cannot be done until the identity of the host is known. */
3769 if (tblock->filter_command)
3771 transport_filter_timeout = tblock->filter_timeout;
3773 /* On failure, copy the error to all addresses, abandon the SMTP call, and
3776 if (!transport_set_up_command(&transport_filter_argv,
3777 tblock->filter_command, TRUE, DEFER, addrlist, FALSE,
3778 string_sprintf("%.50s transport filter", tblock->name), NULL))
3780 set_errno_nohost(addrlist->next, addrlist->basic_errno, addrlist->message, DEFER,
3781 FALSE, &sx->delivery_start);
3786 if ( transport_filter_argv
3787 && *transport_filter_argv
3788 && **transport_filter_argv
3789 && smtp_peer_options & OPTION_CHUNKING
3790 #ifndef DISABLE_DKIM
3791 /* When dkim signing, chunking is handled even with a transport-filter */
3792 && !(ob->dkim.dkim_private_key && ob->dkim.dkim_domain && ob->dkim.dkim_selector)
3793 && !ob->dkim.force_bodyhash
3797 smtp_peer_options &= ~OPTION_CHUNKING;
3798 DEBUG(D_transport) debug_printf("CHUNKING not usable due to transport filter\n");
3802 /* For messages that have more than the maximum number of envelope recipients,
3803 we want to send several transactions down the same SMTP connection. (See
3804 comments in deliver.c as to how this reconciles, heuristically, with
3805 remote_max_parallel.) This optimization was added to Exim after the following
3806 code was already working. The simplest way to put it in without disturbing the
3807 code was to use a goto to jump back to this point when there is another
3808 transaction to handle. */
3811 sx->from_addr = return_path;
3812 sx->sync_addr = sx->first_addr;
3814 sx->send_rset = TRUE;
3815 sx->completed_addr = FALSE;
3818 /* If we are a continued-connection-after-verify the MAIL and RCPT
3819 commands were already sent; do not re-send but do mark the addrs as
3820 having been accepted up to RCPT stage. A traditional cont-conn
3821 always has a sequence number greater than one. */
3823 if (continue_hostname && continue_sequence == 1)
3825 /* sx->pending_MAIL = FALSE; */
3827 /* sx->next_addr = NULL; */
3829 for (address_item * addr = addrlist; addr; addr = addr->next)
3830 addr->transport_return = PENDING_OK;
3834 /* Initiate a message transfer. */
3836 switch(smtp_write_mail_and_rcpt_cmds(sx, &yield))
3839 case -1: case -2: goto RESPONSE_FAILED;
3840 case -3: goto END_OFF;
3841 case -4: goto SEND_QUIT;
3842 default: goto SEND_FAILED;
3845 /* If we are an MUA wrapper, abort if any RCPTs were rejected, either
3846 permanently or temporarily. We should have flushed and synced after the last
3854 for (a = sx->first_addr, cnt = 0; a && cnt < sx->max_rcpt; a = a->next, cnt++)
3855 if (a->transport_return != PENDING_OK)
3857 /*XXX could we find a better errno than 0 here? */
3858 set_errno_nohost(addrlist, 0, a->message, FAIL,
3859 testflag(a, af_pass_message), &sx->delivery_start);
3866 /* If ok is TRUE, we know we have got at least one good recipient, and must now
3867 send DATA, but if it is FALSE (in the normal, non-wrapper case), we may still
3868 have a good recipient buffered up if we are pipelining. We don't want to waste
3869 time sending DATA needlessly, so we only send it if either ok is TRUE or if we
3870 are pipelining. The responses are all handled by sync_responses().
3871 If using CHUNKING, do not send a BDAT until we know how big a chunk we want
3874 if ( !(smtp_peer_options & OPTION_CHUNKING)
3875 && (sx->ok || (pipelining_active && !mua_wrapper)))
3877 int count = smtp_write_command(sx, SCMD_FLUSH, "DATA\r\n");
3879 if (count < 0) goto SEND_FAILED;
3880 switch(sync_responses(sx, count, sx->ok ? +1 : -1))
3882 case 3: sx->ok = TRUE; /* 2xx & 5xx => OK & progress made */
3883 case 2: sx->completed_addr = TRUE; /* 5xx (only) => progress made */
3886 case 1: sx->ok = TRUE; /* 2xx (only) => OK, but if LMTP, */
3887 if (!sx->lmtp) sx->completed_addr = TRUE; /* can't tell about progress yet */
3888 case 0: break; /* No 2xx or 5xx, but no probs */
3890 case -1: goto END_OFF; /* Timeout on RCPT */
3892 #ifndef DISABLE_PIPE_CONNECT
3893 case -5: /* TLS first-read error */
3894 case -4: HDEBUG(D_transport)
3895 debug_printf("failed reaping pipelined cmd responses\n");
3897 default: goto RESPONSE_FAILED; /* I/O error, or any MAIL/DATA error */
3899 pipelining_active = FALSE;
3900 data_command = string_copy(big_buffer); /* Save for later error message */
3903 /* If there were no good recipients (but otherwise there have been no
3904 problems), just set ok TRUE, since we have handled address-specific errors
3905 already. Otherwise, it's OK to send the message. Use the check/escape mechanism
3906 for handling the SMTP dot-handling protocol, flagging to apply to headers as
3907 well as body. Set the appropriate timeout value to be used for each chunk.
3908 (Haven't been able to make it work using select() for writing yet.) */
3911 && (!(smtp_peer_options & OPTION_CHUNKING) || !pipelining_active))
3913 /* Save the first address of the next batch. */
3914 sx->first_addr = sx->next_addr;
3920 transport_ctx tctx = {
3921 .u = {.fd = sx->cctx.sock}, /*XXX will this need TLS info? */
3924 .check_string = US".",
3925 .escape_string = US"..", /* Escaping strings */
3927 topt_use_crlf | topt_escape_headers
3928 | (tblock->body_only ? topt_no_headers : 0)
3929 | (tblock->headers_only ? topt_no_body : 0)
3930 | (tblock->return_path_add ? topt_add_return_path : 0)
3931 | (tblock->delivery_date_add ? topt_add_delivery_date : 0)
3932 | (tblock->envelope_to_add ? topt_add_envelope_to : 0)
3935 /* If using CHUNKING we need a callback from the generic transport
3936 support to us, for the sending of BDAT smtp commands and the reaping
3937 of responses. The callback needs a whole bunch of state so set up
3938 a transport-context structure to be passed around. */
3940 if (smtp_peer_options & OPTION_CHUNKING)
3942 tctx.check_string = tctx.escape_string = NULL;
3943 tctx.options |= topt_use_bdat;
3944 tctx.chunk_cb = smtp_chunk_cmd_callback;
3945 sx->pending_BDAT = FALSE;
3946 sx->good_RCPT = sx->ok;
3948 tctx.smtp_context = sx;
3951 tctx.options |= topt_end_dot;
3953 /* Save the first address of the next batch. */
3954 sx->first_addr = sx->next_addr;
3956 /* Responses from CHUNKING commands go in buffer. Otherwise,
3957 there has not been a response. */
3961 sigalrm_seen = FALSE;
3962 transport_write_timeout = ob->data_timeout;
3963 smtp_command = US"sending data block"; /* For error messages */
3964 DEBUG(D_transport|D_v)
3965 if (smtp_peer_options & OPTION_CHUNKING)
3966 debug_printf(" will write message using CHUNKING\n");
3968 debug_printf(" SMTP>> writing message and terminating \".\"\n");
3969 transport_count = 0;
3971 #ifndef DISABLE_DKIM
3973 # ifdef MEASURE_TIMING
3975 gettimeofday(&t0, NULL);
3977 dkim_exim_sign_init();
3978 # ifdef EXPERIMENTAL_ARC
3980 uschar * s = ob->arc_sign;
3983 if (!(ob->dkim.arc_signspec = s = expand_string(s)))
3985 if (!f.expand_string_forcedfail)
3987 message = US"failed to expand arc_sign";
3994 /* Ask dkim code to hash the body for ARC */
3995 (void) arc_ams_setup_sign_bodyhash();
3996 ob->dkim.force_bodyhash = TRUE;
4001 # ifdef MEASURE_TIMING
4002 report_time_since(&t0, US"dkim_exim_sign_init (delta)");
4007 /* See if we can pipeline QUIT. Reasons not to are
4008 - pipelining not active
4009 - not ok to send quit
4010 - errors in amtp transation responses
4011 - more addrs to send for this message or this host
4012 - this message was being retried
4013 - more messages for this host
4014 If we can, we want the message-write to not flush (the tail end of) its data out. */
4016 if ( sx->pipelining_used
4017 && (sx->ok && sx->completed_addr || smtp_peer_options & OPTION_CHUNKING)
4019 && !(sx->first_addr || f.continue_more)
4020 && f.deliver_firsttime
4023 smtp_compare_t t_compare =
4024 {.tblock = tblock, .current_sender_address = sender_address};
4029 ( tls_out.active.sock < 0 && !continue_proxy_cipher
4030 || verify_check_given_host(CUSS &ob->hosts_nopass_tls, host) != OK
4034 transport_check_waiting(tblock->name, host->name,
4035 tblock->connection_max_messages, new_message_id,
4036 (oicf)smtp_are_same_identities, (void*)&t_compare);
4039 HDEBUG(D_transport) debug_printf("will pipeline QUIT\n");
4040 tctx.options |= topt_no_flush;
4044 #ifndef DISABLE_DKIM
4045 sx->ok = dkim_transport_write_message(&tctx, &ob->dkim, CUSS &message);
4047 sx->ok = transport_write_message(&tctx, 0);
4050 /* transport_write_message() uses write() because it is called from other
4051 places to write to non-sockets. This means that under some OS (e.g. Solaris)
4052 it can exit with "Broken pipe" as its error. This really means that the
4053 socket got closed at the far end. */
4055 transport_write_timeout = 0; /* for subsequent transports */
4057 /* Failure can either be some kind of I/O disaster (including timeout),
4058 or the failure of a transport filter or the expansion of added headers.
4059 Or, when CHUNKING, it can be a protocol-detected failure. */
4062 if (message) goto SEND_FAILED;
4063 else goto RESPONSE_FAILED;
4065 /* We used to send the terminating "." explicitly here, but because of
4066 buffering effects at both ends of TCP/IP connections, you don't gain
4067 anything by keeping it separate, so it might as well go in the final
4068 data buffer for efficiency. This is now done by setting the topt_end_dot
4071 smtp_command = US"end of data";
4073 /* If we can pipeline a QUIT with the data them send it now. If a new message
4074 for this host appeared in the queue while data was being sent, we will not see
4075 it and it will have to wait for a queue run. If there was one but another
4076 thread took it, we might attempt to send it - but locking of spoolfiles will
4077 detect that. Use _MORE to get QUIT in FIN segment. */
4079 if (tcw_done && !tcw)
4081 /*XXX jgh 2021/03/10 google et. al screwup. G, at least, sends TCP FIN in response to TLS
4082 close-notify. Under TLS 1.3, violating RFC.
4083 However, TLS 1.2 does not have half-close semantics. */
4085 if ( sx->cctx.tls_ctx
4086 #if 0 && !defined(DISABLE_TLS)
4087 && Ustrcmp(tls_out.ver, "TLS1.3") != 0
4089 || !f.deliver_firsttime
4091 { /* Send QUIT now and not later */
4092 (void)smtp_write_command(sx, SCMD_FLUSH, "QUIT\r\n");
4093 sx->send_quit = FALSE;
4096 { /* add QUIT to the output buffer */
4097 (void)smtp_write_command(sx, SCMD_MORE, "QUIT\r\n");
4098 sx->send_quit = FALSE; /* avoid sending it later */
4101 if (sx->cctx.tls_ctx && sx->send_tlsclose) /* need to send TLS Close Notify */
4103 # ifdef EXIM_TCP_CORK /* Use _CORK to get Close Notify in FIN segment */
4104 (void) setsockopt(sx->cctx.sock, IPPROTO_TCP, EXIM_TCP_CORK, US &on, sizeof(on));
4106 tls_shutdown_wr(sx->cctx.tls_ctx);
4107 sx->send_tlsclose = FALSE; /* avoid later repeat */
4110 HDEBUG(D_transport|D_acl|D_v) debug_printf_indent(" SMTP(shutdown)>>\n");
4111 shutdown(sx->cctx.sock, SHUT_WR); /* flush output buffer, with TCP FIN */
4115 if (smtp_peer_options & OPTION_CHUNKING && sx->cmd_count > 1)
4117 /* Reap any outstanding MAIL & RCPT commands, but not a DATA-go-ahead */
4118 switch(sync_responses(sx, sx->cmd_count-1, 0))
4120 case 3: sx->ok = TRUE; /* 2xx & 5xx => OK & progress made */
4121 case 2: sx->completed_addr = TRUE; /* 5xx (only) => progress made */
4124 case 1: sx->ok = TRUE; /* 2xx (only) => OK, but if LMTP, */
4125 if (!sx->lmtp) sx->completed_addr = TRUE; /* can't tell about progress yet */
4126 case 0: break; /* No 2xx or 5xx, but no probs */
4128 case -1: goto END_OFF; /* Timeout on RCPT */
4130 #ifndef DISABLE_PIPE_CONNECT
4131 case -5: /* TLS first-read error */
4132 case -4: HDEBUG(D_transport)
4133 debug_printf("failed reaping pipelined cmd responses\n");
4135 default: goto RESPONSE_FAILED; /* I/O error, or any MAIL/DATA error */
4139 #ifndef DISABLE_PRDR
4140 /* For PRDR we optionally get a partial-responses warning followed by the
4141 individual responses, before going on with the overall response. If we don't
4142 get the warning then deal with per non-PRDR. */
4146 sx->ok = smtp_read_response(sx, sx->buffer, sizeof(sx->buffer), '3', ob->final_timeout);
4147 if (!sx->ok && errno == 0) switch(sx->buffer[0])
4149 case '2': sx->prdr_active = FALSE;
4152 case '4': errno = ERRNO_DATA4XX;
4153 addrlist->more_errno |=
4154 ((sx->buffer[1] - '0')*10 + sx->buffer[2] - '0') << 8;
4161 /* For non-PRDR SMTP, we now read a single response that applies to the
4162 whole message. If it is OK, then all the addresses have been delivered. */
4166 sx->ok = smtp_read_response(sx, sx->buffer, sizeof(sx->buffer), '2',
4168 if (!sx->ok && errno == 0 && sx->buffer[0] == '4')
4170 errno = ERRNO_DATA4XX;
4171 addrlist->more_errno |= ((sx->buffer[1] - '0')*10 + sx->buffer[2] - '0') << 8;
4175 /* For LMTP, we get back a response for every RCPT command that we sent;
4176 some may be accepted and some rejected. For those that get a response, their
4177 status is fixed; any that are accepted have been handed over, even if later
4178 responses crash - at least, that's how I read RFC 2033.
4180 If all went well, mark the recipient addresses as completed, record which
4181 host/IPaddress they were delivered to, and cut out RSET when sending another
4182 message down the same channel. Write the completed addresses to the journal
4183 now so that they are recorded in case there is a crash of hardware or
4184 software before the spool gets updated. Also record the final SMTP
4185 confirmation if needed (for SMTP only). */
4190 struct timeval delivery_time;
4192 uschar * conf = NULL;
4194 timesince(&delivery_time, &sx->delivery_start);
4195 sx->send_rset = FALSE;
4196 pipelining_active = FALSE;
4198 /* Set up confirmation if needed - applies only to SMTP */
4201 #ifdef DISABLE_EVENT
4202 LOGGING(smtp_confirmation) &&
4207 const uschar * s = string_printing(sx->buffer);
4208 /* deconst cast ok here as string_printing was checked to have alloc'n'copied */
4209 conf = s == sx->buffer ? US string_copy(s) : US s;
4212 /* Process all transported addresses - for LMTP or PRDR, read a status for
4213 each one. We used to drop out at first_addr, until someone returned a 452
4214 followed by a 250... and we screwed up the accepted addresses. */
4216 for (address_item * addr = addrlist; addr; addr = addr->next)
4218 if (addr->transport_return != PENDING_OK) continue;
4220 /* LMTP - if the response fails badly (e.g. timeout), use it for all the
4221 remaining addresses. Otherwise, it's a return code for just the one
4222 address. For temporary errors, add a retry item for the address so that
4223 it doesn't get tried again too soon. */
4225 #ifndef DISABLE_PRDR
4226 if (sx->lmtp || sx->prdr_active)
4231 if (!smtp_read_response(sx, sx->buffer, sizeof(sx->buffer), '2',
4234 if (errno != 0 || sx->buffer[0] == 0) goto RESPONSE_FAILED;
4235 addr->message = string_sprintf(
4236 #ifndef DISABLE_PRDR
4237 "%s error after %s: %s", sx->prdr_active ? "PRDR":"LMTP",
4239 "LMTP error after %s: %s",
4241 data_command, string_printing(sx->buffer));
4242 setflag(addr, af_pass_message); /* Allow message to go to user */
4243 if (sx->buffer[0] == '5')
4244 addr->transport_return = FAIL;
4247 errno = ERRNO_DATA4XX;
4248 addr->more_errno |= ((sx->buffer[1] - '0')*10 + sx->buffer[2] - '0') << 8;
4249 addr->transport_return = DEFER;
4250 #ifndef DISABLE_PRDR
4251 if (!sx->prdr_active)
4253 retry_add_item(addr, addr->address_retry_key, 0);
4257 sx->completed_addr = TRUE; /* NOW we can set this flag */
4258 if (LOGGING(smtp_confirmation))
4260 const uschar *s = string_printing(sx->buffer);
4261 /* deconst cast ok here as string_printing was checked to have alloc'n'copied */
4262 conf = (s == sx->buffer) ? US string_copy(s) : US s;
4266 /* SMTP, or success return from LMTP for this address. Pass back the
4267 actual host that was used. */
4269 addr->transport_return = OK;
4270 addr->host_used = host;
4271 addr->delivery_time = delivery_time;
4272 addr->special_action = flag;
4273 addr->message = conf;
4275 if (tcp_out_fastopen)
4277 setflag(addr, af_tcp_fastopen_conn);
4278 if (tcp_out_fastopen >= TFO_USED_NODATA) setflag(addr, af_tcp_fastopen);
4279 if (tcp_out_fastopen >= TFO_USED_DATA) setflag(addr, af_tcp_fastopen_data);
4281 if (sx->pipelining_used) setflag(addr, af_pipelining);
4282 #ifndef DISABLE_PIPE_CONNECT
4283 if (sx->early_pipe_active) setflag(addr, af_early_pipe);
4285 #ifndef DISABLE_PRDR
4286 if (sx->prdr_active) setflag(addr, af_prdr_used);
4288 if (smtp_peer_options & OPTION_CHUNKING) setflag(addr, af_chunking_used);
4291 #ifndef DISABLE_PRDR
4292 if (!sx->prdr_active)
4295 /* Update the journal. For homonymic addresses, use the base address plus
4296 the transport name. See lots of comments in deliver.c about the reasons
4297 for the complications when homonyms are involved. Just carry on after
4298 write error, as it may prove possible to update the spool file later. */
4300 if (testflag(addr, af_homonym))
4301 sprintf(CS sx->buffer, "%.500s/%s\n", addr->unique + 3, tblock->name);
4303 sprintf(CS sx->buffer, "%.500s\n", addr->unique);
4305 DEBUG(D_deliver) debug_printf("S:journalling %s", sx->buffer);
4306 len = Ustrlen(CS sx->buffer);
4307 if (write(journal_fd, sx->buffer, len) != len)
4308 log_write(0, LOG_MAIN|LOG_PANIC, "failed to write journal for "
4309 "%s: %s", sx->buffer, strerror(errno));
4313 #ifndef DISABLE_PRDR
4314 if (sx->prdr_active)
4316 const uschar * overall_message;
4318 /* PRDR - get the final, overall response. For any non-success
4319 upgrade all the address statuses. */
4321 sx->ok = smtp_read_response(sx, sx->buffer, sizeof(sx->buffer), '2',
4325 if(errno == 0 && sx->buffer[0] == '4')
4327 errno = ERRNO_DATA4XX;
4328 addrlist->more_errno |= ((sx->buffer[1] - '0')*10 + sx->buffer[2] - '0') << 8;
4330 for (address_item * addr = addrlist; addr != sx->first_addr; addr = addr->next)
4331 if (sx->buffer[0] == '5' || addr->transport_return == OK)
4332 addr->transport_return = PENDING_OK; /* allow set_errno action */
4333 goto RESPONSE_FAILED;
4336 /* Append the overall response to the individual PRDR response for logging
4337 and update the journal, or setup retry. */
4339 overall_message = string_printing(sx->buffer);
4340 for (address_item * addr = addrlist; addr != sx->first_addr; addr = addr->next)
4341 if (addr->transport_return == OK)
4342 addr->message = string_sprintf("%s\\n%s", addr->message, overall_message);
4344 for (address_item * addr = addrlist; addr != sx->first_addr; addr = addr->next)
4345 if (addr->transport_return == OK)
4347 if (testflag(addr, af_homonym))
4348 sprintf(CS sx->buffer, "%.500s/%s\n", addr->unique + 3, tblock->name);
4350 sprintf(CS sx->buffer, "%.500s\n", addr->unique);
4352 DEBUG(D_deliver) debug_printf("journalling(PRDR) %s\n", sx->buffer);
4353 len = Ustrlen(CS sx->buffer);
4354 if (write(journal_fd, sx->buffer, len) != len)
4355 log_write(0, LOG_MAIN|LOG_PANIC, "failed to write journal for "
4356 "%s: %s", sx->buffer, strerror(errno));
4358 else if (addr->transport_return == DEFER)
4359 /*XXX magic value -2 ? maybe host+message ? */
4360 retry_add_item(addr, addr->address_retry_key, -2);
4364 /* Ensure the journal file is pushed out to disk. */
4366 if (EXIMfsync(journal_fd) < 0)
4367 log_write(0, LOG_MAIN|LOG_PANIC, "failed to fsync journal: %s",
4373 /* Handle general (not specific to one address) failures here. The value of ok
4374 is used to skip over this code on the falling through case. A timeout causes a
4375 deferral. Other errors may defer or fail according to the response code, and
4376 may set up a special errno value, e.g. after connection chopped, which is
4377 assumed if errno == 0 and there is no text in the buffer. If control reaches
4378 here during the setting up phase (i.e. before MAIL FROM) then always defer, as
4379 the problem is not related to this specific message. */
4384 uschar * set_message;
4390 /* Clear send_quit flag if needed. Do not set. */
4391 sx->send_quit &= check_response(host, &save_errno, addrlist->more_errno,
4392 sx->buffer, &code, &message, &pass_message);
4400 message = string_sprintf("smtp send to %s [%s] failed: %s",
4401 host->name, host->address, message ? message : US strerror(save_errno));
4402 sx->send_quit = FALSE;
4410 sx->ok = FALSE; /* For when reached by GOTO */
4411 set_message = message;
4413 /* We want to handle timeouts after MAIL or "." and loss of connection after
4414 "." specially. They can indicate a problem with the sender address or with
4415 the contents of the message rather than a real error on the connection. These
4416 cases are treated in the same way as a 4xx response. This next bit of code
4417 does the classification. */
4424 message_error = TRUE;
4428 message_error = Ustrncmp(smtp_command,"MAIL",4) == 0 ||
4429 Ustrncmp(smtp_command,"end ",4) == 0;
4432 case ERRNO_SMTPCLOSED:
4433 message_error = Ustrncmp(smtp_command,"end ",4) == 0;
4436 #ifndef DISABLE_DKIM
4438 /* DKIM signing failure: avoid thinking we pipelined quit,
4439 just abandon the message and close the socket. */
4441 message_error = FALSE;
4442 # ifndef DISABLE_TLS
4443 if (sx->cctx.tls_ctx)
4445 tls_close(sx->cctx.tls_ctx,
4446 sx->send_tlsclose ? TLS_SHUTDOWN_WAIT : TLS_SHUTDOWN_WONLY);
4447 sx->cctx.tls_ctx = NULL;
4453 message_error = FALSE;
4457 /* Handle the cases that are treated as message errors. These are:
4459 (a) negative response or timeout after MAIL
4460 (b) negative response after DATA
4461 (c) negative response or timeout or dropped connection after "."
4462 (d) utf8 support required and not offered
4464 It won't be a negative response or timeout after RCPT, as that is dealt
4465 with separately above. The action in all cases is to set an appropriate
4466 error code for all the addresses, but to leave yield set to OK because the
4467 host itself has not failed. Of course, it might in practice have failed
4468 when we've had a timeout, but if so, we'll discover that at the next
4469 delivery attempt. For a temporary error, set the message_defer flag, and
4470 write to the logs for information if this is not the last host. The error
4471 for the last host will be logged as part of the address's log line. */
4475 if (mua_wrapper) code = '5'; /* Force hard failure in wrapper mode */
4477 /* If there's an errno, the message contains just the identity of
4482 else /* Anything other than 5 is treated as temporary */
4486 message = US string_sprintf("%s: %s", message, strerror(save_errno));
4488 write_logs(host, message, sx->first_addr ? sx->first_addr->basic_errno : 0);
4490 *message_defer = TRUE;
4493 DEBUG(D_transport) if (sx->cctx.sock >= 0)
4496 if (ioctl(sx->cctx.sock, TIOCOUTQ, &n) == 0)
4497 debug_printf("%d bytes remain in socket output buffer\n", n);
4501 /* Otherwise, we have an I/O error or a timeout other than after MAIL or
4502 ".", or some other transportation error. We defer all addresses and yield
4503 DEFER, except for the case of failed add_headers expansion, or a transport
4504 filter failure, when the yield should be ERROR, to stop it trying other
4509 #ifndef DISABLE_PIPE_CONNECT
4510 /* If we were early-pipelinng and the actual EHLO response did not match
4511 the cached value we assumed, we could have detected it and passed a
4512 custom errno through to here. It would be nice to RSET and retry right
4513 away, but to reliably do that we eould need an extra synch point before
4514 we committed to data and that would discard half the gained roundrips.
4515 Or we could summarily drop the TCP connection. but that is also ugly.
4516 Instead, we ignore the possibility (having freshened the cache) and rely
4517 on the server telling us with a nonmessage error if we have tried to
4518 do something it no longer supports. */
4521 yield = (save_errno == ERRNO_CHHEADER_FAIL ||
4522 save_errno == ERRNO_FILTER_FAIL) ? ERROR : DEFER;
4526 set_errno(addrlist, save_errno, set_message, set_rc, pass_message, host,
4527 #ifdef EXPERIMENTAL_DSN_INFO
4528 sx->smtp_greeting, sx->helo_response,
4530 &sx->delivery_start);
4533 /* If all has gone well, send_quit will be set TRUE, implying we can end the
4534 SMTP session tidily. However, if there were too many addresses to send in one
4535 message (indicated by first_addr being non-NULL) we want to carry on with the
4536 rest of them. Also, it is desirable to send more than one message down the SMTP
4537 connection if there are several waiting, provided we haven't already sent so
4538 many as to hit the configured limit. The function transport_check_waiting looks
4539 for a waiting message and returns its id. Then transport_pass_socket tries to
4540 set up a continued delivery by passing the socket on to another process. The
4541 variable send_rset is FALSE if a message has just been successfully transferred.
4543 If we are already sending down a continued channel, there may be further
4544 addresses not yet delivered that are aimed at the same host, but which have not
4545 been passed in this run of the transport. In this case, continue_more will be
4546 true, and all we should do is send RSET if necessary, and return, leaving the
4549 However, if no address was disposed of, i.e. all addresses got 4xx errors, we
4550 do not want to continue with other messages down the same channel, because that
4551 can lead to looping between two or more messages, all with the same,
4552 temporarily failing address(es). [The retry information isn't updated yet, so
4553 new processes keep on trying.] We probably also don't want to try more of this
4554 message's addresses either.
4556 If we have started a TLS session, we have to end it before passing the
4557 connection to a new process. However, not all servers can handle this (Exim
4558 can), so we do not pass such a connection on if the host matches
4559 hosts_nopass_tls. */
4562 debug_printf("ok=%d send_quit=%d send_rset=%d continue_more=%d "
4563 "yield=%d first_address is %sNULL\n", sx->ok, sx->send_quit,
4564 sx->send_rset, f.continue_more, yield, sx->first_addr ? "not " : "");
4566 if (sx->completed_addr && sx->ok && sx->send_quit)
4567 #ifdef EXPERIMENTAL_ESMTP_LIMITS
4568 if (mail_limit = continue_sequence >= sx->max_mail)
4571 debug_printf("reached limit %u for MAILs per conn\n", sx->max_mail);
4576 smtp_compare_t t_compare =
4577 {.tblock = tblock, .current_sender_address = sender_address};
4579 if ( sx->first_addr /* more addrs for this message */
4580 || f.continue_more /* more addrs for continued-host */
4581 || tcw_done && tcw /* more messages for host */
4584 ( tls_out.active.sock < 0 && !continue_proxy_cipher
4585 || verify_check_given_host(CUSS &ob->hosts_nopass_tls, host) != OK
4589 transport_check_waiting(tblock->name, host->name,
4590 sx->max_mail, new_message_id,
4591 (oicf)smtp_are_same_identities, (void*)&t_compare)
4598 if (! (sx->ok = smtp_write_command(sx, SCMD_FLUSH, "RSET\r\n") >= 0))
4600 msg = US string_sprintf("smtp send to %s [%s] failed: %s", host->name,
4601 host->address, strerror(errno));
4602 sx->send_quit = FALSE;
4604 else if (! (sx->ok = smtp_read_response(sx, sx->buffer, sizeof(sx->buffer),
4605 '2', ob->command_timeout)))
4608 sx->send_quit = check_response(host, &errno, 0, sx->buffer, &code, &msg,
4612 DEBUG(D_transport) debug_printf("H=%s [%s] %s\n",
4613 host->name, host->address, msg);
4617 /* Either RSET was not needed, or it succeeded */
4624 int socket_fd = sx->cctx.sock;
4626 if (sx->first_addr) /* More addresses still to be sent */
4627 { /* for this message */
4628 #ifdef EXPERIMENTAL_ESMTP_LIMITS
4629 /* Any that we marked as skipped, reset to do now */
4630 for (address_item * a = sx->first_addr; a; a = a->next)
4631 if (a->transport_return == SKIP)
4632 a->transport_return = PENDING_DEFER;
4634 continue_sequence++; /* for consistency */
4635 clearflag(sx->first_addr, af_new_conn);
4636 setflag(sx->first_addr, af_cont_conn); /* Causes * in logging */
4637 pipelining_active = sx->pipelining_used; /* was cleared at DATA */
4641 /* Unless caller said it already has more messages listed for this host,
4642 pass the connection on to a new Exim process (below, the call to
4643 transport_pass_socket). If the caller has more ready, just return with
4644 the connection still open. */
4647 if (tls_out.active.sock >= 0)
4648 if ( f.continue_more
4649 || verify_check_given_host(CUSS &ob->hosts_noproxy_tls, host) == OK)
4651 /* Before passing the socket on, or returning to caller with it still
4652 open, we must shut down TLS. Not all MTAs allow for the continuation
4653 of the SMTP session when TLS is shut down. We test for this by sending
4654 a new EHLO. If we don't get a good response, we don't attempt to pass
4657 tls_close(sx->cctx.tls_ctx,
4658 sx->send_tlsclose ? TLS_SHUTDOWN_WAIT : TLS_SHUTDOWN_WONLY);
4659 sx->send_tlsclose = FALSE;
4660 sx->cctx.tls_ctx = NULL;
4661 tls_out.active.sock = -1;
4662 smtp_peer_options = smtp_peer_options_wrap;
4664 && smtp_write_command(sx, SCMD_FLUSH, "EHLO %s\r\n", sx->helo_data)
4666 && smtp_read_response(sx, sx->buffer, sizeof(sx->buffer),
4667 '2', ob->command_timeout);
4669 if (sx->ok && f.continue_more)
4670 goto TIDYUP; /* More addresses for another run */
4674 /* Set up a pipe for proxying TLS for the new transport process */
4676 smtp_peer_options |= OPTION_TLS;
4677 if ((sx->ok = socketpair(AF_UNIX, SOCK_STREAM, 0, pfd) == 0))
4680 set_errno(sx->first_addr, errno, US"internal allocation problem",
4682 # ifdef EXPERIMENTAL_DSN_INFO
4683 sx->smtp_greeting, sx->helo_response,
4685 &sx->delivery_start);
4689 if (f.continue_more)
4690 goto TIDYUP; /* More addresses for another run */
4692 /* If the socket is successfully passed, we mustn't send QUIT (or
4693 indeed anything!) from here. */
4695 /*XXX DSN_INFO: assume likely to do new HELO; but for greet we'll want to
4696 propagate it from the initial
4698 if (sx->ok && transport_pass_socket(tblock->name, host->name,
4699 host->address, new_message_id, socket_fd
4700 #ifdef EXPERIMENTAL_ESMTP_LIMITS
4701 , sx->peer_limit_mail, sx->peer_limit_rcpt, sx->peer_limit_rcptdom
4705 sx->send_quit = FALSE;
4707 /* We have passed the client socket to a fresh transport process.
4708 If TLS is still active, we need to proxy it for the transport we
4709 just passed the baton to. Fork a child to to do it, and return to
4710 get logging done asap. Which way to place the work makes assumptions
4711 about post-fork prioritisation which may not hold on all platforms. */
4713 if (tls_out.active.sock >= 0)
4715 int pid = exim_fork(US"tls-proxy-interproc");
4716 if (pid == 0) /* child; fork again to disconnect totally */
4718 /* does not return */
4719 smtp_proxy_tls(sx->cctx.tls_ctx, sx->buffer, sizeof(sx->buffer), pfd,
4720 ob->command_timeout, host->name);
4723 if (pid > 0) /* parent */
4726 /* tidy the inter-proc to disconn the proxy proc */
4727 waitpid(pid, NULL, 0);
4728 tls_close(sx->cctx.tls_ctx, TLS_NO_SHUTDOWN);
4729 sx->cctx.tls_ctx = NULL;
4730 (void)close(sx->cctx.sock);
4732 continue_transport = NULL;
4733 continue_hostname = NULL;
4736 log_write(0, LOG_PANIC_DIE, "fork failed");
4742 /* If RSET failed and there are addresses left, they get deferred. */
4744 set_errno(sx->first_addr, errno, msg, DEFER, FALSE, host,
4745 #ifdef EXPERIMENTAL_DSN_INFO
4746 sx->smtp_greeting, sx->helo_response,
4748 &sx->delivery_start);
4752 /* End off tidily with QUIT unless the connection has died or the socket has
4753 been passed to another process. */
4757 { /* Use _MORE to get QUIT in FIN segment */
4758 (void)smtp_write_command(sx, SCMD_MORE, "QUIT\r\n");
4760 if (sx->cctx.tls_ctx && sx->send_tlsclose)
4762 # ifdef EXIM_TCP_CORK /* Use _CORK to get TLS Close Notify in FIN segment */
4763 (void) setsockopt(sx->cctx.sock, IPPROTO_TCP, EXIM_TCP_CORK, US &on, sizeof(on));
4765 tls_shutdown_wr(sx->cctx.tls_ctx);
4766 sx->send_tlsclose = FALSE;
4773 /* Close the socket, and return the appropriate value, first setting
4774 works because the NULL setting is passed back to the calling process, and
4775 remote_max_parallel is forced to 1 when delivering over an existing connection,
4777 If all went well and continue_more is set, we shouldn't actually get here if
4778 there are further addresses, as the return above will be taken. However,
4779 writing RSET might have failed, or there may be other addresses whose hosts are
4780 specified in the transports, and therefore not visible at top level, in which
4781 case continue_more won't get set. */
4785 /* This flushes data queued in the socket, being the QUIT and any TLS Close,
4786 sending them along with the client FIN flag. Us (we hope) sending FIN first
4787 means we (client) take the TIME_WAIT state, so the server (which likely has a
4788 higher connection rate) does not have to. */
4790 HDEBUG(D_transport|D_acl|D_v) debug_printf_indent(" SMTP(shutdown)>>\n");
4791 shutdown(sx->cctx.sock, SHUT_WR);
4794 if (sx->send_quit || tcw_done && !tcw)
4796 /* Wait for (we hope) ack of our QUIT, and a server FIN. Discard any data
4797 received, then discard the socket. Any packet received after then, or receive
4798 data still in the socket, will get a RST - hence the pause/drain. */
4800 /* Reap the response to QUIT, timing out after one second */
4801 (void) smtp_read_response(sx, sx->buffer, sizeof(sx->buffer), '2', 1);
4803 if (sx->cctx.tls_ctx)
4807 /* Reap the TLS Close Notify from the server, timing out after one second */
4808 sigalrm_seen = FALSE;
4811 n = tls_read(sx->cctx.tls_ctx, sx->inbuffer, sizeof(sx->inbuffer));
4812 while (!sigalrm_seen && n > 0);
4815 if (sx->send_tlsclose)
4817 # ifdef EXIM_TCP_CORK
4818 (void) setsockopt(sx->cctx.sock, IPPROTO_TCP, EXIM_TCP_CORK, US &on, sizeof(on));
4820 tls_close(sx->cctx.tls_ctx, TLS_SHUTDOWN_WAIT);
4823 tls_close(sx->cctx.tls_ctx, TLS_SHUTDOWN_WONLY);
4824 sx->cctx.tls_ctx = NULL;
4828 /* Drain any trailing data from the socket before close, to avoid sending a RST */
4830 if ( poll_one_fd(sx->cctx.sock, POLLIN, 20) != 0 /* 20ms */
4831 && fcntl(sx->cctx.sock, F_SETFL, O_NONBLOCK) == 0)
4832 for (int i = 16, n; /* drain socket */
4833 (n = read(sx->cctx.sock, sx->inbuffer, sizeof(sx->inbuffer))) > 0 && i > 0;
4834 i--) HDEBUG(D_transport|D_acl|D_v)
4837 debug_printf_indent(" SMTP(drain %d bytes)<< %.*s\n", n, m, sx->inbuffer);
4838 for (m = 0; m < n; m++)
4839 debug_printf("0x%02x\n", sx->inbuffer[m]);
4842 HDEBUG(D_transport|D_acl|D_v) debug_printf_indent(" SMTP(close)>>\n");
4843 (void)close(sx->cctx.sock);
4845 continue_transport = NULL;
4846 continue_hostname = NULL;
4847 smtp_debug_cmd_report();
4849 #ifndef DISABLE_EVENT
4850 (void) event_raise(tblock->event_action, US"tcp:close", NULL, NULL);
4856 sx->first_addr = NULL;
4857 for (address_item * a = sx->addrlist->next; a; a = a->next)
4858 if (a->transport_return == DANE)
4860 a->transport_return = PENDING_DEFER;
4861 if (!sx->first_addr)
4863 /* Remember the new start-point in the addrlist, for smtp_setup_conn()
4864 to get the domain string for SNI */
4867 clearflag(a, af_cont_conn);
4868 setflag(a, af_new_conn); /* clear * from logging */
4869 DEBUG(D_transport) debug_printf("DANE: go-around for %s\n", a->domain);
4872 continue_sequence = 1; /* for consistency */
4877 #ifdef EXPERIMENTAL_ESMTP_LIMITS
4878 if (mail_limit && sx->first_addr)
4880 /* Reset the sequence count since we closed the connection. This is flagged
4881 on the pipe back to the delivery process so that a non-continued-conn delivery
4884 continue_sequence = 1; /* for consistency */
4885 clearflag(sx->first_addr, af_cont_conn);
4886 setflag(sx->first_addr, af_new_conn); /* clear * from logging */
4895 if (dane_held) for (address_item * a = sx->addrlist->next; a; a = a->next)
4896 if (a->transport_return == DANE)
4897 a->transport_return = PENDING_DEFER;
4905 /*************************************************
4906 * Closedown entry point *
4907 *************************************************/
4909 /* This function is called when exim is passed an open smtp channel
4910 from another incarnation, but the message which it has been asked
4911 to deliver no longer exists. The channel is on stdin.
4913 We might do fancy things like looking for another message to send down
4914 the channel, but if the one we sought has gone, it has probably been
4915 delivered by some other process that itself will seek further messages,
4916 so just close down our connection.
4918 Argument: pointer to the transport instance block
4923 smtp_transport_closedown(transport_instance *tblock)
4925 smtp_transport_options_block * ob = SOB tblock->options_block;
4926 client_conn_ctx cctx;
4929 uschar inbuffer[4096];
4930 uschar outbuffer[16];
4932 /*XXX really we need an active-smtp-client ctx, rather than assuming stdout */
4933 cctx.sock = fileno(stdin);
4934 cctx.tls_ctx = cctx.sock == tls_out.active.sock ? tls_out.active.tls_ctx : NULL;
4936 sx.inblock.cctx = &cctx;
4937 sx.inblock.buffer = inbuffer;
4938 sx.inblock.buffersize = sizeof(inbuffer);
4939 sx.inblock.ptr = inbuffer;
4940 sx.inblock.ptrend = inbuffer;
4942 sx.outblock.cctx = &cctx;
4943 sx.outblock.buffersize = sizeof(outbuffer);
4944 sx.outblock.buffer = outbuffer;
4945 sx.outblock.ptr = outbuffer;
4946 sx.outblock.cmd_count = 0;
4947 sx.outblock.authenticating = FALSE;
4949 (void)smtp_write_command(&sx, SCMD_FLUSH, "QUIT\r\n");
4950 (void)smtp_read_response(&sx, buffer, sizeof(buffer), '2', ob->command_timeout);
4951 (void)close(cctx.sock);
4956 /*************************************************
4957 * Prepare addresses for delivery *
4958 *************************************************/
4960 /* This function is called to flush out error settings from previous delivery
4961 attempts to other hosts. It also records whether we got here via an MX record
4962 or not in the more_errno field of the address. We are interested only in
4963 addresses that are still marked DEFER - others may have got delivered to a
4964 previously considered IP address. Set their status to PENDING_DEFER to indicate
4965 which ones are relevant this time.
4968 addrlist the list of addresses
4969 host the host we are delivering to
4971 Returns: the first address for this delivery
4974 static address_item *
4975 prepare_addresses(address_item *addrlist, host_item *host)
4977 address_item *first_addr = NULL;
4978 for (address_item * addr = addrlist; addr; addr = addr->next)
4979 if (addr->transport_return == DEFER)
4981 if (!first_addr) first_addr = addr;
4982 addr->transport_return = PENDING_DEFER;
4983 addr->basic_errno = 0;
4984 addr->more_errno = (host->mx >= 0)? 'M' : 'A';
4985 addr->message = NULL;
4987 addr->cipher = NULL;
4988 addr->ourcert = NULL;
4989 addr->peercert = NULL;
4990 addr->peerdn = NULL;
4991 addr->ocsp = OCSP_NOT_REQ;
4992 addr->tlsver = NULL;
4994 #ifdef EXPERIMENTAL_DSN_INFO
4995 addr->smtp_greeting = NULL;
4996 addr->helo_response = NULL;
5004 /*************************************************
5005 * Main entry point *
5006 *************************************************/
5008 /* See local README for interface details. As this is a remote transport, it is
5009 given a chain of addresses to be delivered in one connection, if possible. It
5010 always returns TRUE, indicating that each address has its own independent
5011 status set, except if there is a setting up problem, in which case it returns
5015 smtp_transport_entry(
5016 transport_instance *tblock, /* data for this instantiation */
5017 address_item *addrlist) /* addresses we are working on */
5020 int hosts_defer = 0;
5022 int hosts_looked_up = 0;
5023 int hosts_retry = 0;
5024 int hosts_serial = 0;
5025 int hosts_total = 0;
5026 int total_hosts_tried = 0;
5027 BOOL expired = TRUE;
5028 uschar *expanded_hosts = NULL;
5030 uschar *tid = string_sprintf("%s transport", tblock->name);
5031 smtp_transport_options_block *ob = SOB tblock->options_block;
5032 host_item *hostlist = addrlist->host_list;
5033 host_item *host = NULL;
5037 debug_printf("%s transport entered\n", tblock->name);
5038 for (address_item * addr = addrlist; addr; addr = addr->next)
5039 debug_printf(" %s\n", addr->address);
5042 debug_printf("hostlist:\n");
5043 for (host_item * host = hostlist; host; host = host->next)
5044 debug_printf(" '%s' IP %s port %d\n", host->name, host->address, host->port);
5046 if (continue_hostname)
5047 debug_printf("already connected to %s [%s] (on fd %d)\n",
5048 continue_hostname, continue_host_address,
5049 cutthrough.cctx.sock >= 0 ? cutthrough.cctx.sock : 0);
5052 /* Check the restrictions on line length */
5054 if (max_received_linelength > ob->message_linelength_limit)
5057 gettimeofday(&now, NULL);
5059 for (address_item * addr = addrlist; addr; addr = addr->next)
5060 if (addr->transport_return == DEFER)
5061 addr->transport_return = PENDING_DEFER;
5063 set_errno_nohost(addrlist, ERRNO_SMTPFORMAT,
5064 US"message has lines too long for transport", FAIL, TRUE, &now);
5068 /* Set the flag requesting that these hosts be added to the waiting
5069 database if the delivery fails temporarily or if we are running with
5070 queue_smtp or a 2-stage queue run. This gets unset for certain
5071 kinds of error, typically those that are specific to the message. */
5073 update_waiting = TRUE;
5075 /* If a host list is not defined for the addresses - they must all have the
5076 same one in order to be passed to a single transport - or if the transport has
5077 a host list with hosts_override set, use the host list supplied with the
5078 transport. It is an error for this not to exist. */
5080 if (!hostlist || (ob->hosts_override && ob->hosts))
5084 addrlist->message = string_sprintf("%s transport called with no hosts set",
5086 addrlist->transport_return = PANIC;
5087 return FALSE; /* Only top address has status */
5090 DEBUG(D_transport) debug_printf("using the transport's hosts: %s\n",
5093 /* If the transport's host list contains no '$' characters, and we are not
5094 randomizing, it is fixed and therefore a chain of hosts can be built once
5095 and for all, and remembered for subsequent use by other calls to this
5096 transport. If, on the other hand, the host list does contain '$', or we are
5097 randomizing its order, we have to rebuild it each time. In the fixed case,
5098 as the hosts string will never be used again, it doesn't matter that we
5099 replace all the : characters with zeros. */
5103 uschar *s = ob->hosts;
5105 if (Ustrchr(s, '$'))
5107 if (!(expanded_hosts = expand_string(s)))
5109 addrlist->message = string_sprintf("failed to expand list of hosts "
5110 "\"%s\" in %s transport: %s", s, tblock->name, expand_string_message);
5111 addrlist->transport_return = f.search_find_defer ? DEFER : PANIC;
5112 return FALSE; /* Only top address has status */
5114 DEBUG(D_transport) debug_printf("expanded list of hosts \"%s\" to "
5115 "\"%s\"\n", s, expanded_hosts);
5119 if (ob->hosts_randomize) s = expanded_hosts = string_copy(s);
5123 log_write(0, LOG_MAIN|LOG_PANIC,
5124 "attempt to use tainted host list '%s' from '%s' in transport %s",
5125 s, ob->hosts, tblock->name);
5126 /* Avoid leaking info to an attacker */
5127 addrlist->message = US"internal configuration error";
5128 addrlist->transport_return = PANIC;
5132 host_build_hostlist(&hostlist, s, ob->hosts_randomize);
5134 /* Check that the expansion yielded something useful. */
5138 string_sprintf("%s transport has empty hosts setting", tblock->name);
5139 addrlist->transport_return = PANIC;
5140 return FALSE; /* Only top address has status */
5143 /* If there was no expansion of hosts, save the host list for
5146 if (!expanded_hosts) ob->hostlist = hostlist;
5149 /* This is not the first time this transport has been run in this delivery;
5150 the host list was built previously. */
5153 hostlist = ob->hostlist;
5156 /* The host list was supplied with the address. If hosts_randomize is set, we
5157 must sort it into a random order if it did not come from MX records and has not
5158 already been randomized (but don't bother if continuing down an existing
5161 else if (ob->hosts_randomize && hostlist->mx == MX_NONE && !continue_hostname)
5163 host_item *newlist = NULL;
5166 host_item *h = hostlist;
5167 hostlist = hostlist->next;
5169 h->sort_key = random_number(100);
5176 else if (h->sort_key < newlist->sort_key)
5183 host_item *hh = newlist;
5186 if (h->sort_key < hh->next->sort_key) break;
5194 hostlist = addrlist->host_list = newlist;
5197 /* Sort out the default port. */
5199 if (!smtp_get_port(ob->port, addrlist, &defport, tid)) return FALSE;
5201 /* For each host-plus-IP-address on the list:
5203 . If this is a continued delivery and the host isn't the one with the
5204 current connection, skip.
5206 . If the status is unusable (i.e. previously failed or retry checked), skip.
5208 . If no IP address set, get the address, either by turning the name into
5209 an address, calling gethostbyname if gethostbyname is on, or by calling
5210 the DNS. The DNS may yield multiple addresses, in which case insert the
5211 extra ones into the list.
5213 . Get the retry data if not previously obtained for this address and set the
5214 field which remembers the state of this address. Skip if the retry time is
5215 not reached. If not, remember whether retry data was found. The retry string
5216 contains both the name and the IP address.
5218 . Scan the list of addresses and mark those whose status is DEFER as
5219 PENDING_DEFER. These are the only ones that will be processed in this cycle
5222 . Make a delivery attempt - addresses marked PENDING_DEFER will be tried.
5223 Some addresses may be successfully delivered, others may fail, and yet
5224 others may get temporary errors and so get marked DEFER.
5226 . The return from the delivery attempt is OK if a connection was made and a
5227 valid SMTP dialogue was completed. Otherwise it is DEFER.
5229 . If OK, add a "remove" retry item for this host/IPaddress, if any.
5231 . If fail to connect, or other defer state, add a retry item.
5233 . If there are any addresses whose status is still DEFER, carry on to the
5234 next host/IPaddress, unless we have tried the number of hosts given
5235 by hosts_max_try or hosts_max_try_hardlimit; otherwise return. Note that
5236 there is some fancy logic for hosts_max_try that means its limit can be
5237 overstepped in some circumstances.
5239 If we get to the end of the list, all hosts have deferred at least one address,
5240 or not reached their retry times. If delay_after_cutoff is unset, it requests a
5241 delivery attempt to those hosts whose last try was before the arrival time of
5242 the current message. To cope with this, we have to go round the loop a second
5243 time. After that, set the status and error data for any addresses that haven't
5244 had it set already. */
5246 for (int cutoff_retry = 0;
5247 expired && cutoff_retry < (ob->delay_after_cutoff ? 1 : 2);
5250 host_item *nexthost = NULL;
5251 int unexpired_hosts_tried = 0;
5252 BOOL continue_host_tried = FALSE;
5254 retry_non_continued:
5255 for (host = hostlist;
5257 && unexpired_hosts_tried < ob->hosts_max_try
5258 && total_hosts_tried < ob->hosts_max_try_hardlimit;
5263 BOOL host_is_expired = FALSE;
5264 BOOL message_defer = FALSE;
5265 BOOL some_deferred = FALSE;
5266 address_item *first_addr = NULL;
5267 uschar *interface = NULL;
5268 uschar *retry_host_key = NULL;
5269 uschar *retry_message_key = NULL;
5270 uschar *serialize_key = NULL;
5272 /* Default next host is next host. :-) But this can vary if the
5273 hosts_max_try limit is hit (see below). It may also be reset if a host
5274 address is looked up here (in case the host was multihomed). */
5276 nexthost = host->next;
5278 /* If the address hasn't yet been obtained from the host name, look it up
5279 now, unless the host is already marked as unusable. If it is marked as
5280 unusable, it means that the router was unable to find its IP address (in
5281 the DNS or wherever) OR we are in the 2nd time round the cutoff loop, and
5282 the lookup failed last time. We don't get this far if *all* MX records
5283 point to non-existent hosts; that is treated as a hard error.
5285 We can just skip this host entirely. When the hosts came from the router,
5286 the address will timeout based on the other host(s); when the address is
5287 looked up below, there is an explicit retry record added.
5289 Note that we mustn't skip unusable hosts if the address is not unset; they
5290 may be needed as expired hosts on the 2nd time round the cutoff loop. */
5294 int new_port, flags;
5296 if (host->status >= hstatus_unusable)
5298 DEBUG(D_transport) debug_printf("%s has no address and is unusable - skipping\n",
5303 DEBUG(D_transport) debug_printf("getting address for %s\n", host->name);
5305 /* The host name is permitted to have an attached port. Find it, and
5306 strip it from the name. Just remember it for now. */
5308 new_port = host_item_get_port(host);
5310 /* Count hosts looked up */
5314 /* Find by name if so configured, or if it's an IP address. We don't
5315 just copy the IP address, because we need the test-for-local to happen. */
5317 flags = HOST_FIND_BY_A | HOST_FIND_BY_AAAA;
5318 if (ob->dns_qualify_single) flags |= HOST_FIND_QUALIFY_SINGLE;
5319 if (ob->dns_search_parents) flags |= HOST_FIND_SEARCH_PARENTS;
5321 if (ob->gethostbyname || string_is_ip_address(host->name, NULL) != 0)
5322 rc = host_find_byname(host, NULL, flags, NULL, TRUE);
5324 rc = host_find_bydns(host, NULL, flags, NULL, NULL, NULL,
5325 &ob->dnssec, /* domains for request/require */
5328 /* Update the host (and any additional blocks, resulting from
5329 multihoming) with a host-specific port, if any. */
5331 for (host_item * hh = host; hh != nexthost; hh = hh->next) hh->port = new_port;
5333 /* Failure to find the host at this time (usually DNS temporary failure)
5334 is really a kind of routing failure rather than a transport failure.
5335 Therefore we add a retry item of the routing kind, not to stop us trying
5336 to look this name up here again, but to ensure the address gets timed
5337 out if the failures go on long enough. A complete failure at this point
5338 commonly points to a configuration error, but the best action is still
5339 to carry on for the next host. */
5341 if (rc == HOST_FIND_AGAIN || rc == HOST_FIND_SECURITY || rc == HOST_FIND_FAILED)
5343 retry_add_item(addrlist, string_sprintf("R:%s", host->name), 0);
5345 if (rc == HOST_FIND_AGAIN) hosts_defer++; else hosts_fail++;
5346 DEBUG(D_transport) debug_printf("rc = %s for %s\n", (rc == HOST_FIND_AGAIN)?
5347 "HOST_FIND_AGAIN" : "HOST_FIND_FAILED", host->name);
5348 host->status = hstatus_unusable;
5350 for (address_item * addr = addrlist; addr; addr = addr->next)
5352 if (addr->transport_return != DEFER) continue;
5353 addr->basic_errno = ERRNO_UNKNOWNHOST;
5354 addr->message = string_sprintf(
5355 rc == HOST_FIND_SECURITY
5356 ? "lookup of IP address for %s was insecure"
5357 : "failed to lookup IP address for %s",
5363 /* If the host is actually the local host, we may have a problem, or
5364 there may be some cunning configuration going on. In the problem case,
5365 log things and give up. The default transport status is already DEFER. */
5367 if (rc == HOST_FOUND_LOCAL && !ob->allow_localhost)
5369 for (address_item * addr = addrlist; addr; addr = addr->next)
5371 addr->basic_errno = ERRNO_HOST_IS_LOCAL;
5372 addr->message = string_sprintf("%s transport found host %s to be "
5373 "local", tblock->name, host->name);
5377 } /* End of block for IP address lookup */
5379 /* If this is a continued delivery, we are interested only in the host
5380 which matches the name of the existing open channel. The check is put
5381 here after the local host lookup, in case the name gets expanded as a
5382 result of the lookup. Set expired FALSE, to save the outer loop executing
5385 if (continue_hostname)
5386 if ( Ustrcmp(continue_hostname, host->name) != 0
5387 || Ustrcmp(continue_host_address, host->address) != 0
5391 continue; /* With next host */
5394 continue_host_tried = TRUE;
5396 /* Reset the default next host in case a multihomed host whose addresses
5397 are not looked up till just above added to the host list. */
5399 nexthost = host->next;
5401 /* If queue_smtp is set (-odqs or the first part of a 2-stage run), or the
5402 domain is in queue_smtp_domains, we don't actually want to attempt any
5403 deliveries. When doing a queue run, queue_smtp_domains is always unset. If
5404 there is a lookup defer in queue_smtp_domains, proceed as if the domain
5405 were not in it. We don't want to hold up all SMTP deliveries! Except when
5406 doing a two-stage queue run, don't do this if forcing. */
5408 if ( (!f.deliver_force || f.queue_2stage)
5410 || match_isinlist(addrlist->domain,
5411 CUSS &queue_smtp_domains, 0,
5412 &domainlist_anchor, NULL, MCL_DOMAIN, TRUE, NULL) == OK)
5415 DEBUG(D_transport) debug_printf("first-pass routing only\n");
5417 for (address_item * addr = addrlist; addr; addr = addr->next)
5418 if (addr->transport_return == DEFER)
5419 addr->message = US"first-pass only routing due to -odqs, "
5420 "queue_smtp_domains or control=queue";
5421 continue; /* With next host */
5424 /* Count hosts being considered - purely for an intelligent comment
5425 if none are usable. */
5429 /* Set $host and $host address now in case they are needed for the
5430 interface expansion or the serialize_hosts check; they remain set if an
5431 actual delivery happens. */
5433 deliver_host = host->name;
5434 deliver_host_address = host->address;
5435 lookup_dnssec_authenticated = host->dnssec == DS_YES ? US"yes"
5436 : host->dnssec == DS_NO ? US"no"
5439 /* Set up a string for adding to the retry key if the port number is not
5440 the standard SMTP port. A host may have its own port setting that overrides
5443 pistring = string_sprintf(":%d", host->port == PORT_NONE
5444 ? defport : host->port);
5445 if (Ustrcmp(pistring, ":25") == 0) pistring = US"";
5447 /* Select IPv4 or IPv6, and choose an outgoing interface. If the interface
5448 string is set, even if constant (as different transports can have different
5449 constant settings), we must add it to the key that is used for retries,
5450 because connections to the same host from a different interface should be
5451 treated separately. */
5453 host_af = Ustrchr(host->address, ':') ? AF_INET6 : AF_INET;
5455 uschar * s = ob->interface;
5458 if (!smtp_get_interface(s, host_af, addrlist, &interface, tid))
5460 pistring = string_sprintf("%s/%s", pistring, interface);
5464 /* The first time round the outer loop, check the status of the host by
5465 inspecting the retry data. The second time round, we are interested only
5466 in expired hosts that haven't been tried since this message arrived. */
5468 if (cutoff_retry == 0)
5471 /* Ensure the status of the address is set by checking retry data if
5472 necessary. There may be host-specific retry data (applicable to all
5473 messages) and also data for retries of a specific message at this host.
5474 If either of these retry records are actually read, the keys used are
5475 returned to save recomputing them later. */
5477 if (exp_bool(addrlist, US"transport", tblock->name, D_transport,
5478 US"retry_include_ip_address", ob->retry_include_ip_address,
5479 ob->expand_retry_include_ip_address, &incl_ip) != OK)
5480 continue; /* with next host */
5482 host_is_expired = retry_check_address(addrlist->domain, host, pistring,
5483 incl_ip, &retry_host_key, &retry_message_key);
5485 DEBUG(D_transport) debug_printf("%s [%s]%s retry-status = %s\n", host->name,
5486 host->address ? host->address : US"", pistring,
5487 host->status == hstatus_usable ? "usable"
5488 : host->status == hstatus_unusable ? "unusable"
5489 : host->status == hstatus_unusable_expired ? "unusable (expired)" : "?");
5491 /* Skip this address if not usable at this time, noting if it wasn't
5492 actually expired, both locally and in the address. */
5494 switch (host->status)
5496 case hstatus_unusable:
5498 setflag(addrlist, af_retry_skipped);
5501 case hstatus_unusable_expired:
5504 case hwhy_retry: hosts_retry++; break;
5505 case hwhy_failed: hosts_fail++; break;
5507 case hwhy_deferred: hosts_defer++; break;
5510 /* If there was a retry message key, implying that previously there
5511 was a message-specific defer, we don't want to update the list of
5512 messages waiting for these hosts. */
5514 if (retry_message_key) update_waiting = FALSE;
5515 continue; /* With the next host or IP address */
5519 /* Second time round the loop: if the address is set but expired, and
5520 the message is newer than the last try, let it through. */
5525 || host->status != hstatus_unusable_expired
5526 || host->last_try > received_time.tv_sec)
5528 DEBUG(D_transport) debug_printf("trying expired host %s [%s]%s\n",
5529 host->name, host->address, pistring);
5530 host_is_expired = TRUE;
5533 /* Setting "expired=FALSE" doesn't actually mean not all hosts are expired;
5534 it remains TRUE only if all hosts are expired and none are actually tried.
5539 /* If this host is listed as one to which access must be serialized,
5540 see if another Exim process has a connection to it, and if so, skip
5541 this host. If not, update the database to record our connection to it
5542 and remember this for later deletion. Do not do any of this if we are
5543 sending the message down a pre-existing connection. */
5545 if ( !continue_hostname
5546 && verify_check_given_host(CUSS &ob->serialize_hosts, host) == OK)
5548 serialize_key = string_sprintf("host-serialize-%s", host->name);
5549 if (!enq_start(serialize_key, 1))
5552 debug_printf("skipping host %s because another Exim process "
5553 "is connected to it\n", host->name);
5559 /* OK, we have an IP address that is not waiting for its retry time to
5560 arrive (it might be expired) OR (second time round the loop) we have an
5561 expired host that hasn't been tried since the message arrived. Have a go
5562 at delivering the message to it. First prepare the addresses by flushing
5563 out the result of previous attempts, and finding the first address that
5564 is still to be delivered. */
5566 first_addr = prepare_addresses(addrlist, host);
5568 DEBUG(D_transport) debug_printf("delivering %s to %s [%s] (%s%s)\n",
5569 message_id, host->name, host->address, addrlist->address,
5570 addrlist->next ? ", ..." : "");
5572 set_process_info("delivering %s to %s [%s]%s (%s%s)",
5573 message_id, host->name, host->address, pistring, addrlist->address,
5574 addrlist->next ? ", ..." : "");
5576 /* This is not for real; don't do the delivery. If there are
5577 any remaining hosts, list them. */
5582 gettimeofday(&now, NULL);
5583 set_errno_nohost(addrlist, 0, NULL, OK, FALSE, &now);
5584 for (address_item * addr = addrlist; addr; addr = addr->next)
5586 addr->host_used = host;
5587 addr->special_action = '*';
5588 addr->message = US"delivery bypassed by -N option";
5592 debug_printf("*** delivery by %s transport bypassed by -N option\n"
5593 "*** host and remaining hosts:\n", tblock->name);
5594 for (host_item * host2 = host; host2; host2 = host2->next)
5595 debug_printf(" %s [%s]\n", host2->name,
5596 host2->address ? host2->address : US"unset");
5601 /* This is for real. If the host is expired, we don't count it for
5602 hosts_max_retry. This ensures that all hosts must expire before an address
5603 is timed out, unless hosts_max_try_hardlimit (which protects against
5604 lunatic DNS configurations) is reached.
5606 If the host is not expired and we are about to hit the hosts_max_retry
5607 limit, check to see if there is a subsequent hosts with a different MX
5608 value. If so, make that the next host, and don't count this one. This is a
5609 heuristic to make sure that different MXs do get tried. With a normal kind
5610 of retry rule, they would get tried anyway when the earlier hosts were
5611 delayed, but if the domain has a "retry every time" type of rule - as is
5612 often used for the the very large ISPs, that won't happen. */
5617 /* Make a copy of the host if it is local to this invocation
5618 of the transport. */
5622 thost = store_get(sizeof(host_item), GET_UNTAINTED);
5624 thost->name = string_copy(host->name);
5625 thost->address = string_copy(host->address);
5630 if (!host_is_expired && ++unexpired_hosts_tried >= ob->hosts_max_try)
5633 debug_printf("hosts_max_try limit reached with this host\n");
5634 for (host_item * h = host; h; h = h->next) if (h->mx != host->mx)
5637 unexpired_hosts_tried--;
5638 DEBUG(D_transport) debug_printf("however, a higher MX host exists "
5639 "and will be tried\n");
5644 /* Attempt the delivery. */
5646 total_hosts_tried++;
5647 rc = smtp_deliver(addrlist, thost, host_af, defport, interface, tblock,
5648 &message_defer, FALSE);
5651 OK => connection made, each address contains its result;
5652 message_defer is set for message-specific defers (when all
5653 recipients are marked defer)
5654 DEFER => there was a non-message-specific delivery problem;
5655 ERROR => there was a problem setting up the arguments for a filter,
5656 or there was a problem with expanding added headers
5659 /* If the result is not OK, there was a non-message-specific problem.
5660 If the result is DEFER, we need to write to the logs saying what happened
5661 for this particular host, except in the case of authentication and TLS
5662 failures, where the log has already been written. If all hosts defer a
5663 general message is written at the end. */
5665 if (rc == DEFER && first_addr->basic_errno != ERRNO_AUTHFAIL
5666 && first_addr->basic_errno != ERRNO_TLSFAILURE)
5667 write_logs(host, first_addr->message, first_addr->basic_errno);
5669 #ifndef DISABLE_EVENT
5671 deferred_event_raise(first_addr, host, US"msg:host:defer");
5674 /* If STARTTLS was accepted, but there was a failure in setting up the
5675 TLS session (usually a certificate screwup), and the host is not in
5676 hosts_require_tls, and tls_tempfail_tryclear is true, try again, with
5677 TLS forcibly turned off. We have to start from scratch with a new SMTP
5678 connection. That's why the retry is done from here, not from within
5679 smtp_deliver(). [Rejections of STARTTLS itself don't screw up the
5680 session, so the in-clear transmission after those errors, if permitted,
5681 happens inside smtp_deliver().] */
5685 && first_addr->basic_errno == ERRNO_TLSFAILURE
5686 && ob->tls_tempfail_tryclear
5687 && verify_check_given_host(CUSS &ob->hosts_require_tls, host) != OK
5690 log_write(0, LOG_MAIN,
5691 "%s: delivering unencrypted to H=%s [%s] (not in hosts_require_tls)",
5692 first_addr->message, host->name, host->address);
5693 first_addr = prepare_addresses(addrlist, host);
5694 rc = smtp_deliver(addrlist, thost, host_af, defport, interface, tblock,
5695 &message_defer, TRUE);
5696 if (rc == DEFER && first_addr->basic_errno != ERRNO_AUTHFAIL)
5697 write_logs(host, first_addr->message, first_addr->basic_errno);
5698 # ifndef DISABLE_EVENT
5700 deferred_event_raise(first_addr, host, US"msg:host:defer");
5703 #endif /*DISABLE_TLS*/
5705 #ifndef DISABLE_EVENT
5706 /* If the last host gave a defer raise a per-message event */
5709 && unexpired_hosts_tried < ob->hosts_max_try
5710 && total_hosts_tried < ob->hosts_max_try_hardlimit
5712 && (message_defer || rc == DEFER)
5714 deferred_event_raise(first_addr, host, US"msg:defer");
5718 /* Delivery attempt finished */
5720 set_process_info("delivering %s: just tried %s [%s]%s for %s%s: result %s",
5721 message_id, host->name, host->address, pistring, addrlist->address,
5722 addrlist->next ? " (& others)" : "", rc_to_string(rc));
5724 /* Release serialization if set up */
5726 if (serialize_key) enq_end(serialize_key);
5728 /* If the result is DEFER, or if a host retry record is known to exist, we
5729 need to add an item to the retry chain for updating the retry database
5730 at the end of delivery. We only need to add the item to the top address,
5731 of course. Also, if DEFER, we mark the IP address unusable so as to skip it
5732 for any other delivery attempts using the same address. (It is copied into
5733 the unusable tree at the outer level, so even if different address blocks
5734 contain the same address, it still won't get tried again.) */
5736 if (rc == DEFER || retry_host_key)
5738 int delete_flag = rc != DEFER ? rf_delete : 0;
5739 if (!retry_host_key)
5742 if (exp_bool(addrlist, US"transport", tblock->name, D_transport,
5743 US"retry_include_ip_address", ob->retry_include_ip_address,
5744 ob->expand_retry_include_ip_address, &incl_ip) != OK)
5745 incl_ip = TRUE; /* error; use most-specific retry record */
5747 retry_host_key = incl_ip
5748 ? string_sprintf("T:%S:%s%s", host->name, host->address, pistring)
5749 : string_sprintf("T:%S%s", host->name, pistring);
5752 /* If a delivery of another message over an existing SMTP connection
5753 yields DEFER, we do NOT set up retry data for the host. This covers the
5754 case when there are delays in routing the addresses in the second message
5755 that are so long that the server times out. This is alleviated by not
5756 routing addresses that previously had routing defers when handling an
5757 existing connection, but even so, this case may occur (e.g. if a
5758 previously happily routed address starts giving routing defers). If the
5759 host is genuinely down, another non-continued message delivery will
5760 notice it soon enough. */
5762 if (delete_flag != 0 || !continue_hostname)
5763 retry_add_item(first_addr, retry_host_key, rf_host | delete_flag);
5765 /* We may have tried an expired host, if its retry time has come; ensure
5766 the status reflects the expiry for the benefit of any other addresses. */
5770 host->status = host_is_expired
5771 ? hstatus_unusable_expired : hstatus_unusable;
5772 host->why = hwhy_deferred;
5776 /* If message_defer is set (host was OK, but every recipient got deferred
5777 because of some message-specific problem), or if that had happened
5778 previously so that a message retry key exists, add an appropriate item
5779 to the retry chain. Note that if there was a message defer but now there is
5780 a host defer, the message defer record gets deleted. That seems perfectly
5781 reasonable. Also, stop the message from being remembered as waiting
5782 for specific hosts. */
5784 if (message_defer || retry_message_key)
5786 int delete_flag = message_defer ? 0 : rf_delete;
5787 if (!retry_message_key)
5790 if (exp_bool(addrlist, US"transport", tblock->name, D_transport,
5791 US"retry_include_ip_address", ob->retry_include_ip_address,
5792 ob->expand_retry_include_ip_address, &incl_ip) != OK)
5793 incl_ip = TRUE; /* error; use most-specific retry record */
5795 retry_message_key = incl_ip
5796 ? string_sprintf("T:%S:%s%s:%s", host->name, host->address, pistring,
5798 : string_sprintf("T:%S%s:%s", host->name, pistring, message_id);
5800 retry_add_item(addrlist, retry_message_key,
5801 rf_message | rf_host | delete_flag);
5802 update_waiting = FALSE;
5805 /* Any return other than DEFER (that is, OK or ERROR) means that the
5806 addresses have got their final statuses filled in for this host. In the OK
5807 case, see if any of them are deferred. */
5810 for (address_item * addr = addrlist; addr; addr = addr->next)
5811 if (addr->transport_return == DEFER)
5813 some_deferred = TRUE;
5817 /* If no addresses deferred or the result was ERROR, return. We do this for
5818 ERROR because a failing filter set-up or add_headers expansion is likely to
5819 fail for any host we try. */
5821 if (rc == ERROR || (rc == OK && !some_deferred))
5823 DEBUG(D_transport) debug_printf("Leaving %s transport\n", tblock->name);
5824 return TRUE; /* Each address has its status */
5827 /* If the result was DEFER or some individual addresses deferred, let
5828 the loop run to try other hosts with the deferred addresses, except for the
5829 case when we were trying to deliver down an existing channel and failed.
5830 Don't try any other hosts in this case. */
5832 if (continue_hostname) break;
5834 /* If the whole delivery, or some individual addresses, were deferred and
5835 there are more hosts that could be tried, do not count this host towards
5836 the hosts_max_try limit if the age of the message is greater than the
5837 maximum retry time for this host. This means we may try try all hosts,
5838 ignoring the limit, when messages have been around for some time. This is
5839 important because if we don't try all hosts, the address will never time
5840 out. NOTE: this does not apply to hosts_max_try_hardlimit. */
5842 if ((rc == DEFER || some_deferred) && nexthost)
5845 retry_config *retry = retry_find_config(host->name, NULL, 0, 0);
5847 if (retry && retry->rules)
5849 retry_rule *last_rule;
5850 for (last_rule = retry->rules;
5852 last_rule = last_rule->next);
5853 timedout = time(NULL) - received_time.tv_sec > last_rule->timeout;
5855 else timedout = TRUE; /* No rule => timed out */
5859 unexpired_hosts_tried--;
5860 DEBUG(D_transport) debug_printf("temporary delivery error(s) override "
5861 "hosts_max_try (message older than host's retry time)\n");
5867 if (unexpired_hosts_tried >= ob->hosts_max_try)
5868 debug_printf("reached transport hosts_max_try limit %d\n",
5870 if (total_hosts_tried >= ob->hosts_max_try_hardlimit)
5871 debug_printf("reached transport hosts_max_try_hardlimit limit %d\n",
5872 ob->hosts_max_try_hardlimit);
5875 testharness_pause_ms(500); /* let server debug out */
5876 } /* End of loop for trying multiple hosts. */
5878 /* If we failed to find a matching host in the list, for an already-open
5879 connection, just close it and start over with the list. This can happen
5880 for routing that changes from run to run, or big multi-IP sites with
5883 if (continue_hostname && !continue_host_tried)
5885 int fd = cutthrough.cctx.sock >= 0 ? cutthrough.cctx.sock : 0;
5887 DEBUG(D_transport) debug_printf("no hosts match already-open connection\n");
5889 /* A TLS conn could be open for a cutthrough, but not for a plain continued-
5891 /*XXX doublecheck that! */
5893 if (cutthrough.cctx.sock >= 0 && cutthrough.is_tls)
5895 (void) tls_write(cutthrough.cctx.tls_ctx, US"QUIT\r\n", 6, FALSE);
5896 tls_close(cutthrough.cctx.tls_ctx, TLS_SHUTDOWN_NOWAIT);
5897 cutthrough.cctx.tls_ctx = NULL;
5898 cutthrough.is_tls = FALSE;
5902 (void) write(fd, US"QUIT\r\n", 6);
5905 cutthrough.cctx.sock = -1;
5906 continue_hostname = NULL;
5907 goto retry_non_continued;
5910 /* This is the end of the loop that repeats iff expired is TRUE and
5911 ob->delay_after_cutoff is FALSE. The second time round we will
5912 try those hosts that haven't been tried since the message arrived. */
5916 debug_printf("all IP addresses skipped or deferred at least one address\n");
5917 if (expired && !ob->delay_after_cutoff && cutoff_retry == 0)
5918 debug_printf("retrying IP addresses not tried since message arrived\n");
5923 /* Get here if all IP addresses are skipped or defer at least one address. In
5924 MUA wrapper mode, this will happen only for connection or other non-message-
5925 specific failures. Force the delivery status for all addresses to FAIL. */
5929 for (address_item * addr = addrlist; addr; addr = addr->next)
5930 addr->transport_return = FAIL;
5934 /* In the normal, non-wrapper case, add a standard message to each deferred
5935 address if there hasn't been an error, that is, if it hasn't actually been
5936 tried this time. The variable "expired" will be FALSE if any deliveries were
5937 actually tried, or if there was at least one host that was not expired. That
5938 is, it is TRUE only if no deliveries were tried and all hosts were expired. If
5939 a delivery has been tried, an error code will be set, and the failing of the
5940 message is handled by the retry code later.
5942 If queue_smtp is set, or this transport was called to send a subsequent message
5943 down an existing TCP/IP connection, and something caused the host not to be
5944 found, we end up here, but can detect these cases and handle them specially. */
5946 for (address_item * addr = addrlist; addr; addr = addr->next)
5948 /* If host is not NULL, it means that we stopped processing the host list
5949 because of hosts_max_try or hosts_max_try_hardlimit. In the former case, this
5950 means we need to behave as if some hosts were skipped because their retry
5951 time had not come. Specifically, this prevents the address from timing out.
5952 However, if we have hit hosts_max_try_hardlimit, we want to behave as if all
5953 hosts were tried. */
5956 if (total_hosts_tried >= ob->hosts_max_try_hardlimit)
5959 debug_printf("hosts_max_try_hardlimit reached: behave as if all "
5960 "hosts were tried\n");
5965 debug_printf("hosts_max_try limit caused some hosts to be skipped\n");
5966 setflag(addr, af_retry_skipped);
5969 if (f.queue_smtp) /* no deliveries attempted */
5971 addr->transport_return = DEFER;
5972 addr->basic_errno = 0;
5973 addr->message = US"SMTP delivery explicitly queued";
5976 else if ( addr->transport_return == DEFER
5977 && (addr->basic_errno == ERRNO_UNKNOWNERROR || addr->basic_errno == 0)
5981 addr->basic_errno = ERRNO_HRETRY;
5982 if (continue_hostname)
5983 addr->message = US"no host found for existing SMTP connection";
5986 setflag(addr, af_pass_message); /* This is not a security risk */
5987 addr->message = string_sprintf(
5988 "all hosts%s have been failing for a long time %s",
5989 addr->domain ? string_sprintf(" for '%s'", addr->domain) : US"",
5990 ob->delay_after_cutoff
5991 ? US"(and retry time not reached)"
5992 : US"and were last tried after this message arrived");
5994 /* If we are already using fallback hosts, or there are no fallback hosts
5995 defined, convert the result to FAIL to cause a bounce. */
5997 if (addr->host_list == addr->fallback_hosts || !addr->fallback_hosts)
5998 addr->transport_return = FAIL;
6003 if (hosts_retry == hosts_total)
6004 s = "retry time not reached for any host%s";
6005 else if (hosts_fail == hosts_total)
6006 s = "all host address lookups%s failed permanently";
6007 else if (hosts_defer == hosts_total)
6008 s = "all host address lookups%s failed temporarily";
6009 else if (hosts_serial == hosts_total)
6010 s = "connection limit reached for all hosts%s";
6011 else if (hosts_fail+hosts_defer == hosts_total)
6012 s = "all host address lookups%s failed";
6014 s = "some host address lookups failed and retry time "
6015 "not reached for other hosts or connection limit reached%s";
6017 addr->message = string_sprintf(s,
6018 addr->domain ? string_sprintf(" for '%s'", addr->domain) : US"");
6023 /* Update the database which keeps information about which messages are waiting
6024 for which hosts to become available. For some message-specific errors, the
6025 update_waiting flag is turned off because we don't want follow-on deliveries in
6026 those cases. If this transport instance is explicitly limited to one message
6027 per connection then follow-on deliveries are not possible and there's no need
6028 to create/update the per-transport wait-<transport_name> database. */
6030 if (update_waiting && tblock->connection_max_messages != 1)
6031 transport_update_waiting(hostlist, tblock->name);
6035 DEBUG(D_transport) debug_printf("Leaving %s transport\n", tblock->name);
6037 return TRUE; /* Each address has its status */
6040 #endif /*!MACRO_PREDEF*/
6043 /* End of transport/smtp.c */