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 HDEBUG(D_transport|D_acl|D_v) debug_printf_indent(" SMTP>> QUIT\n");
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;
2243 #ifndef DISABLE_PIPE_CONNECT
2244 if ( verify_check_given_host(CUSS &ob->hosts_pipe_connect,
2245 sx->conn_args.host) == OK)
2247 /* We don't find out the local ip address until the connect, so if
2248 the helo string might use it avoid doing early-pipelining. */
2251 || !Ustrstr(sx->helo_data, "$sending_ip_address")
2252 || Ustrstr(sx->helo_data, "def:sending_ip_address")
2255 sx->early_pipe_ok = TRUE;
2256 if ( read_ehlo_cache_entry(sx)
2257 && sx->ehlo_resp.cleartext_features & OPTION_EARLY_PIPE)
2260 debug_printf("Using cached cleartext PIPECONNECT\n");
2261 sx->early_pipe_active = TRUE;
2262 sx->peer_offered = sx->ehlo_resp.cleartext_features;
2265 else DEBUG(D_transport)
2266 debug_printf("helo needs $sending_ip_address\n");
2269 if (sx->early_pipe_active)
2270 sx->outblock.conn_args = &sx->conn_args;
2274 blob lazy_conn = {.data = NULL};
2275 /* For TLS-connect, a TFO lazy-connect is useful since the Client Hello
2276 can go on the TCP SYN. */
2278 if ((sx->cctx.sock = smtp_connect(&sx->conn_args,
2279 sx->smtps ? &lazy_conn : NULL)) < 0)
2281 set_errno_nohost(sx->addrlist,
2282 errno == ETIMEDOUT ? ERRNO_CONNECTTIMEOUT : errno,
2283 sx->verify ? US strerror(errno) : NULL,
2284 DEFER, FALSE, &sx->delivery_start);
2285 sx->send_quit = FALSE;
2289 (void) setsockopt(sx->cctx.sock, IPPROTO_TCP, TCP_QUICKACK, US &off,
2293 /* Expand the greeting message while waiting for the initial response. (Makes
2294 sense if helo_data contains ${lookup dnsdb ...} stuff). The expansion is
2295 delayed till here so that $sending_interface and $sending_port are set. */
2296 /*XXX early-pipe: they still will not be. Is there any way to find out what they
2297 will be? Somehow I doubt it. */
2300 if (!(sx->helo_data = expand_string(sx->helo_data)))
2302 log_write(0, LOG_MAIN|LOG_PANIC,
2303 "<%s>: failed to expand transport's helo_data value for callout: %s",
2304 sx->addrlist->address, expand_string_message);
2309 expand_string_message = NULL;
2310 if ((sx->helo_data = string_domain_utf8_to_alabel(sx->helo_data,
2311 &expand_string_message)),
2312 expand_string_message)
2314 log_write(0, LOG_MAIN|LOG_PANIC,
2315 "<%s>: failed to expand transport's helo_data value for callout: %s",
2316 sx->addrlist->address, expand_string_message);
2318 sx->helo_data = NULL;
2322 /* The first thing is to wait for an initial OK response. The dreaded "goto"
2323 is nevertheless a reasonably clean way of programming this kind of logic,
2324 where you want to escape on any error. */
2328 #ifndef DISABLE_PIPE_CONNECT
2329 if (sx->early_pipe_active)
2331 sx->pending_BANNER = TRUE; /* sync_responses() must eventually handle */
2332 sx->outblock.cmd_count = 1;
2337 if (!smtp_reap_banner(sx))
2338 goto RESPONSE_FAILED;
2341 #ifndef DISABLE_EVENT
2344 lookup_dnssec_authenticated = sx->conn_args.host->dnssec==DS_YES ? US"yes"
2345 : sx->conn_args.host->dnssec==DS_NO ? US"no" : NULL;
2346 s = event_raise(sx->conn_args.tblock->event_action, US"smtp:connect", sx->buffer, NULL);
2349 set_errno_nohost(sx->addrlist, ERRNO_EXPANDFAIL,
2350 string_sprintf("deferred by smtp:connect event expansion: %s", s),
2351 DEFER, FALSE, &sx->delivery_start);
2358 /* Now check if the helo_data expansion went well, and sign off cleanly if
2363 message = string_sprintf("failed to expand helo_data: %s",
2364 expand_string_message);
2365 set_errno_nohost(sx->addrlist, ERRNO_EXPANDFAIL, message, DEFER, FALSE, &sx->delivery_start);
2371 /** Debugging without sending a message
2372 sx->addrlist->transport_return = DEFER;
2376 /* Errors that occur after this point follow an SMTP command, which is
2377 left in big_buffer by smtp_write_command() for use in error messages. */
2379 smtp_command = big_buffer;
2381 /* Tell the remote who we are...
2383 February 1998: A convention has evolved that ESMTP-speaking MTAs include the
2384 string "ESMTP" in their greeting lines, so make Exim send EHLO if the
2385 greeting is of this form. The assumption was that the far end supports it
2386 properly... but experience shows that there are some that give 5xx responses,
2387 even though the banner includes "ESMTP" (there's a bloody-minded one that
2388 says "ESMTP not spoken here"). Cope with that case.
2390 September 2000: Time has passed, and it seems reasonable now to always send
2391 EHLO at the start. It is also convenient to make the change while installing
2394 July 2003: Joachim Wieland met a broken server that advertises "PIPELINING"
2395 but times out after sending MAIL FROM, RCPT TO and DATA all together. There
2396 would be no way to send out the mails, so there is now a host list
2397 "hosts_avoid_esmtp" that disables ESMTP for special hosts and solves the
2398 PIPELINING problem as well. Maybe it can also be useful to cure other
2399 problems with broken servers.
2401 Exim originally sent "Helo" at this point and ran for nearly a year that way.
2402 Then somebody tried it with a Microsoft mailer... It seems that all other
2403 mailers use upper case for some reason (the RFC is quite clear about case
2404 independence) so, for peace of mind, I gave in. */
2406 sx->esmtp = verify_check_given_host(CUSS &ob->hosts_avoid_esmtp, sx->conn_args.host) != OK;
2408 /* Alas; be careful, since this goto is not an error-out, so conceivably
2409 we might set data between here and the target which we assume to exist
2410 and be usable. I can see this coming back to bite us. */
2414 smtp_peer_options |= OPTION_TLS;
2415 suppress_tls = FALSE;
2416 ob->tls_tempfail_tryclear = FALSE;
2417 smtp_command = US"SSL-on-connect";
2424 if (smtp_write_command(sx,
2425 #ifndef DISABLE_PIPE_CONNECT
2426 sx->early_pipe_active ? SCMD_BUFFER :
2429 "%s %s\r\n", sx->lmtp ? "LHLO" : "EHLO", sx->helo_data) < 0)
2431 sx->esmtp_sent = TRUE;
2433 #ifndef DISABLE_PIPE_CONNECT
2434 if (sx->early_pipe_active)
2436 sx->pending_EHLO = TRUE;
2438 /* If we have too many authenticators to handle and might need to AUTH
2439 for this transport, pipeline no further as we will need the
2440 list of auth methods offered. Reap the banner and EHLO. */
2442 if ( (ob->hosts_require_auth || ob->hosts_try_auth)
2443 && f.smtp_in_early_pipe_no_auth)
2445 DEBUG(D_transport) debug_printf("may need to auth, so pipeline no further\n");
2446 if (smtp_write_command(sx, SCMD_FLUSH, NULL) < 0)
2448 if (sync_responses(sx, 2, 0) != 0)
2451 debug_printf("failed reaping pipelined cmd responses\n");
2452 goto RESPONSE_FAILED;
2454 sx->early_pipe_active = FALSE;
2459 if (!smtp_reap_ehlo(sx))
2460 goto RESPONSE_FAILED;
2464 debug_printf("not sending EHLO (host matches hosts_avoid_esmtp)\n");
2466 #ifndef DISABLE_PIPE_CONNECT
2467 if (!sx->early_pipe_active)
2472 int n = sizeof(sx->buffer);
2473 uschar * rsp = sx->buffer;
2475 if (sx->esmtp_sent && (n = Ustrlen(sx->buffer) + 1) < sizeof(sx->buffer)/2)
2476 { rsp = sx->buffer + n; n = sizeof(sx->buffer) - n; }
2478 if (smtp_write_command(sx, SCMD_FLUSH, "HELO %s\r\n", sx->helo_data) < 0)
2480 good_response = smtp_read_response(sx, rsp, n, '2', ob->command_timeout);
2481 #ifdef EXPERIMENTAL_DSN_INFO
2482 sx->helo_response = string_copy(rsp);
2486 /* Handle special logging for a closed connection after HELO
2487 when had previously sent EHLO */
2489 if (rsp != sx->buffer && rsp[0] == 0 && (errno == 0 || errno == ECONNRESET))
2491 errno = ERRNO_SMTPCLOSED;
2492 goto EHLOHELO_FAILED;
2494 memmove(sx->buffer, rsp, Ustrlen(rsp));
2495 goto RESPONSE_FAILED;
2499 if (sx->esmtp || sx->lmtp)
2501 #ifndef DISABLE_PIPE_CONNECT
2502 if (!sx->early_pipe_active)
2505 sx->peer_offered = ehlo_response(sx->buffer,
2506 OPTION_TLS /* others checked later */
2507 #ifndef DISABLE_PIPE_CONNECT
2508 | (sx->early_pipe_ok
2510 | OPTION_CHUNKING | OPTION_PRDR | OPTION_DSN | OPTION_PIPE | OPTION_SIZE
2519 #ifdef EXPERIMENTAL_ESMTP_LIMITS
2520 if (tls_out.active.sock >= 0 || !(sx->peer_offered & OPTION_TLS))
2522 ehlo_response_limits_read(sx);
2523 ehlo_response_limits_apply(sx);
2526 #ifndef DISABLE_PIPE_CONNECT
2527 if (sx->early_pipe_ok)
2529 sx->ehlo_resp.cleartext_features = sx->peer_offered;
2531 if ( (sx->peer_offered & (OPTION_PIPE | OPTION_EARLY_PIPE))
2532 == (OPTION_PIPE | OPTION_EARLY_PIPE))
2534 DEBUG(D_transport) debug_printf("PIPE_CONNECT usable in future for this IP\n");
2535 sx->ehlo_resp.cleartext_auths = study_ehlo_auths(sx);
2536 write_ehlo_cache_entry(sx);
2542 /* Set tls_offered if the response to EHLO specifies support for STARTTLS. */
2545 smtp_peer_options |= sx->peer_offered & OPTION_TLS;
2550 /* For continuing deliveries down the same channel, having re-exec'd the socket
2551 is the standard input; for a socket held open from verify it is recorded
2552 in the cutthrough context block. Either way we don't need to redo EHLO here
2553 (but may need to do so for TLS - see below).
2554 Set up the pointer to where subsequent commands will be left, for
2555 error messages. Note that smtp_peer_options will have been
2556 set from the command line if they were set in the process that passed the
2559 /*XXX continue case needs to propagate DSN_INFO, prob. in deliver.c
2560 as the continue goes via transport_pass_socket() and doublefork and exec.
2561 It does not wait. Unclear how we keep separate host's responses
2562 separate - we could match up by host ip+port as a bodge. */
2566 if (cutthrough.cctx.sock >= 0 && cutthrough.callout_hold_only)
2568 sx->cctx = cutthrough.cctx;
2569 sx->conn_args.host->port = sx->port = cutthrough.host.port;
2573 sx->cctx.sock = 0; /* stdin */
2574 sx->cctx.tls_ctx = NULL;
2575 smtp_port_for_connect(sx->conn_args.host, sx->port); /* Record the port that was used */
2577 sx->inblock.cctx = sx->outblock.cctx = &sx->cctx;
2578 smtp_command = big_buffer;
2579 sx->peer_offered = smtp_peer_options;
2580 #ifdef EXPERIMENTAL_ESMTP_LIMITS
2581 /* Limits passed by cmdline over exec. */
2582 ehlo_limits_apply(sx,
2583 sx->peer_limit_mail = continue_limit_mail,
2584 sx->peer_limit_rcpt = continue_limit_rcpt,
2585 sx->peer_limit_rcptdom = continue_limit_rcptdom);
2587 sx->helo_data = NULL; /* ensure we re-expand ob->helo_data */
2589 /* For a continued connection with TLS being proxied for us, or a
2590 held-open verify connection with TLS, nothing more to do. */
2592 if ( continue_proxy_cipher
2593 || (cutthrough.cctx.sock >= 0 && cutthrough.callout_hold_only
2594 && cutthrough.is_tls)
2597 sx->pipelining_used = pipelining_active = !!(smtp_peer_options & OPTION_PIPE);
2598 HDEBUG(D_transport) debug_printf("continued connection, %s TLS\n",
2599 continue_proxy_cipher ? "proxied" : "verify conn with");
2602 HDEBUG(D_transport) debug_printf("continued connection, no TLS\n");
2605 /* If TLS is available on this connection, whether continued or not, attempt to
2606 start up a TLS session, unless the host is in hosts_avoid_tls. If successful,
2607 send another EHLO - the server may give a different answer in secure mode. We
2608 use a separate buffer for reading the response to STARTTLS so that if it is
2609 negative, the original EHLO data is available for subsequent analysis, should
2610 the client not be required to use TLS. If the response is bad, copy the buffer
2611 for error analysis. */
2614 if ( smtp_peer_options & OPTION_TLS
2616 && verify_check_given_host(CUSS &ob->hosts_avoid_tls, sx->conn_args.host) != OK
2618 || verify_check_given_host(CUSS &ob->hosts_verify_avoid_tls, sx->conn_args.host) != OK
2621 uschar buffer2[4096];
2623 if (smtp_write_command(sx, SCMD_FLUSH, "STARTTLS\r\n") < 0)
2626 #ifndef DISABLE_PIPE_CONNECT
2627 /* If doing early-pipelining reap the banner and EHLO-response but leave
2628 the response for the STARTTLS we just sent alone. On fail, assume wrong
2629 cached capability and retry with the pipelining disabled. */
2631 if (sx->early_pipe_active && sync_responses(sx, 2, 0) != 0)
2634 debug_printf("failed reaping pipelined cmd responses\n");
2635 close(sx->cctx.sock);
2637 sx->early_pipe_active = FALSE;
2638 goto PIPE_CONNECT_RETRY;
2642 /* If there is an I/O error, transmission of this message is deferred. If
2643 there is a temporary rejection of STARRTLS and tls_tempfail_tryclear is
2644 false, we also defer. However, if there is a temporary rejection of STARTTLS
2645 and tls_tempfail_tryclear is true, or if there is an outright rejection of
2646 STARTTLS, we carry on. This means we will try to send the message in clear,
2647 unless the host is in hosts_require_tls (tested below). */
2649 if (!smtp_read_response(sx, buffer2, sizeof(buffer2), '2', ob->command_timeout))
2653 || (buffer2[0] == '4' && !ob->tls_tempfail_tryclear)
2656 Ustrncpy(sx->buffer, buffer2, sizeof(sx->buffer));
2657 sx->buffer[sizeof(sx->buffer)-1] = '\0';
2658 goto RESPONSE_FAILED;
2662 /* STARTTLS accepted: try to negotiate a TLS session. */
2667 if (!tls_client_start(&sx->cctx, &sx->conn_args, sx->addrlist, &tls_out, &tls_errstr))
2669 /* TLS negotiation failed; give an error. From outside, this function may
2670 be called again to try in clear on a new connection, if the options permit
2671 it for this host. */
2673 DEBUG(D_tls) debug_printf("TLS session fail: %s\n", tls_errstr);
2675 # ifdef SUPPORT_DANE
2676 if (sx->conn_args.dane)
2678 log_write(0, LOG_MAIN,
2679 "DANE attempt failed; TLS connection to %s [%s]: %s",
2680 sx->conn_args.host->name, sx->conn_args.host->address, tls_errstr);
2681 # ifndef DISABLE_EVENT
2682 (void) event_raise(sx->conn_args.tblock->event_action,
2683 US"dane:fail", US"validation-failure", NULL); /* could do with better detail */
2688 errno = ERRNO_TLSFAILURE;
2689 message = string_sprintf("TLS session: %s", tls_errstr);
2690 sx->send_quit = FALSE;
2693 sx->send_tlsclose = TRUE;
2695 /* TLS session is set up. Check the inblock fill level. If there is
2696 content then as we have not yet done a tls read it must have arrived before
2697 the TLS handshake, in-clear. That violates the sync requirement of the
2698 STARTTLS RFC, so fail. */
2700 if (sx->inblock.ptr != sx->inblock.ptrend)
2704 int i = sx->inblock.ptrend - sx->inblock.ptr;
2705 debug_printf("unused data in input buffer after ack for STARTTLS:\n"
2707 i > 100 ? 100 : i, sx->inblock.ptr, i > 100 ? "..." : "");
2709 tls_errstr = US"synch error before connect";
2710 goto TLS_CONN_FAILED;
2713 smtp_peer_options_wrap = smtp_peer_options;
2714 for (address_item * addr = sx->addrlist; addr; addr = addr->next)
2715 if (addr->transport_return == PENDING_DEFER)
2717 addr->cipher = tls_out.cipher;
2718 addr->ourcert = tls_out.ourcert;
2719 addr->peercert = tls_out.peercert;
2720 addr->peerdn = tls_out.peerdn;
2721 addr->ocsp = tls_out.ocsp;
2722 addr->tlsver = tls_out.ver;
2727 /* if smtps, we'll have smtp_command set to something else; always safe to
2729 smtp_command = big_buffer;
2731 /* If we started TLS, redo the EHLO/LHLO exchange over the secure channel. If
2732 helo_data is null, we are dealing with a connection that was passed from
2733 another process, and so we won't have expanded helo_data above. We have to
2734 expand it here. $sending_ip_address and $sending_port are set up right at the
2735 start of the Exim process (in exim.c). */
2737 if (tls_out.active.sock >= 0)
2739 uschar * greeting_cmd;
2741 if (!sx->helo_data && !(sx->helo_data = expand_string(ob->helo_data)))
2743 uschar *message = string_sprintf("failed to expand helo_data: %s",
2744 expand_string_message);
2745 set_errno_nohost(sx->addrlist, ERRNO_EXPANDFAIL, message, DEFER, FALSE, &sx->delivery_start);
2750 #ifndef DISABLE_PIPE_CONNECT
2751 /* For SMTPS there is no cleartext early-pipe; use the crypted permission bit.
2752 We're unlikely to get the group sent and delivered before the server sends its
2753 banner, but it's still worth sending as a group.
2754 For STARTTLS allow for cleartext early-pipe but no crypted early-pipe, but not
2757 if (sx->smtps ? sx->early_pipe_ok : sx->early_pipe_active)
2759 sx->peer_offered = sx->ehlo_resp.crypted_features;
2760 if ((sx->early_pipe_active =
2761 !!(sx->ehlo_resp.crypted_features & OPTION_EARLY_PIPE)))
2762 DEBUG(D_transport) debug_printf("Using cached crypted PIPECONNECT\n");
2765 #ifdef EXPERIMMENTAL_ESMTP_LIMITS
2766 /* As we are about to send another EHLO, forget any LIMITS received so far. */
2767 sx->peer_limit_mail = sx->peer_limit_rcpt = sx->peer_limit_rcptdom = 0;
2768 if ((sx->max_mail = sx->conn_args.tblock->connection_max_message) == 0) sx->max_mail = 999999;
2769 if ((sx->max_rcpt = sx->conn_args.tblock->max_addresses) == 0) sx->max_rcpt = 999999;
2770 sx->single_rcpt_domain = FALSE;
2773 /* For SMTPS we need to wait for the initial OK response. */
2775 #ifndef DISABLE_PIPE_CONNECT
2776 if (sx->early_pipe_active)
2778 sx->pending_BANNER = TRUE;
2779 sx->outblock.cmd_count = 1;
2783 if (!smtp_reap_banner(sx))
2784 goto RESPONSE_FAILED;
2787 greeting_cmd = US"LHLO";
2789 greeting_cmd = US"EHLO";
2792 greeting_cmd = US"HELO";
2794 debug_printf("not sending EHLO (host matches hosts_avoid_esmtp)\n");
2797 if (smtp_write_command(sx,
2798 #ifndef DISABLE_PIPE_CONNECT
2799 sx->early_pipe_active ? SCMD_BUFFER :
2802 "%s %s\r\n", greeting_cmd, sx->helo_data) < 0)
2805 #ifndef DISABLE_PIPE_CONNECT
2806 if (sx->early_pipe_active)
2807 sx->pending_EHLO = TRUE;
2811 if (!smtp_reap_ehlo(sx))
2814 /* The GnuTLS layer in Exim only spots a server-rejection of a client
2815 cert late, under TLS1.3 - which means here; the first time we try to
2816 receive crypted data. Treat it as if it was a connect-time failure.
2817 See also the early-pipe equivalent... which will be hard; every call
2818 to sync_responses will need to check the result.
2819 It would be nicer to have GnuTLS check the cert during the handshake.
2820 Can it do that, with all the flexibility we need? */
2822 tls_errstr = US"error on first read";
2823 goto TLS_CONN_FAILED;
2826 goto RESPONSE_FAILED;
2828 smtp_peer_options = 0;
2832 /* If the host is required to use a secure channel, ensure that we
2836 # ifdef SUPPORT_DANE
2837 || sx->conn_args.dane
2839 || verify_check_given_host(CUSS &ob->hosts_require_tls, sx->conn_args.host) == OK
2842 errno = ERRNO_TLSREQUIRED;
2843 message = string_sprintf("a TLS session is required, but %s",
2844 smtp_peer_options & OPTION_TLS
2845 ? "an attempt to start TLS failed" : "the server did not offer TLS support");
2846 # if defined(SUPPORT_DANE) && !defined(DISABLE_EVENT)
2847 if (sx->conn_args.dane)
2848 (void) event_raise(sx->conn_args.tblock->event_action, US"dane:fail",
2849 smtp_peer_options & OPTION_TLS
2850 ? US"validation-failure" /* could do with better detail */
2851 : US"starttls-not-supported",
2856 #endif /*DISABLE_TLS*/
2858 /* If TLS is active, we have just started it up and re-done the EHLO command,
2859 so its response needs to be analyzed. If TLS is not active and this is a
2860 continued session down a previously-used socket, we haven't just done EHLO, so
2863 if ( !continue_hostname
2865 || tls_out.active.sock >= 0
2869 if (sx->esmtp || sx->lmtp)
2871 #ifndef DISABLE_PIPE_CONNECT
2872 if (!sx->early_pipe_active)
2875 sx->peer_offered = ehlo_response(sx->buffer,
2877 #ifndef DISABLE_PIPE_CONNECT
2878 | (sx->lmtp && ob->lmtp_ignore_quota ? OPTION_IGNQ : 0)
2879 | OPTION_DSN | OPTION_PIPE | OPTION_SIZE
2880 | OPTION_CHUNKING | OPTION_PRDR | OPTION_UTF8
2881 | (tls_out.active.sock >= 0 ? OPTION_EARLY_PIPE : 0) /* not for lmtp */
2885 | (sx->lmtp && ob->lmtp_ignore_quota ? OPTION_IGNQ : 0)
2888 # ifdef SUPPORT_I18N
2889 | (sx->addrlist->prop.utf8_msg ? OPTION_UTF8 : 0)
2890 /*XXX if we hand peercaps on to continued-conn processes,
2891 must not depend on this addr */
2895 | (ob->size_addition >= 0 ? OPTION_SIZE : 0)
2898 #ifndef DISABLE_PIPE_CONNECT
2899 if (tls_out.active.sock >= 0)
2900 sx->ehlo_resp.crypted_features = sx->peer_offered;
2903 #ifdef EXPERIMENTAL_ESMTP_LIMITS
2904 if (tls_out.active.sock >= 0 || !(sx->peer_offered & OPTION_TLS))
2906 ehlo_response_limits_read(sx);
2907 ehlo_response_limits_apply(sx);
2912 /* Set for IGNOREQUOTA if the response to LHLO specifies support and the
2913 lmtp_ignore_quota option was set. */
2915 sx->igquotstr = sx->peer_offered & OPTION_IGNQ ? US" IGNOREQUOTA" : US"";
2917 /* If the response to EHLO specified support for the SIZE parameter, note
2918 this, provided size_addition is non-negative. */
2920 smtp_peer_options |= sx->peer_offered & OPTION_SIZE;
2922 /* Note whether the server supports PIPELINING. If hosts_avoid_esmtp matched
2923 the current host, esmtp will be false, so PIPELINING can never be used. If
2924 the current host matches hosts_avoid_pipelining, don't do it. */
2926 if ( sx->peer_offered & OPTION_PIPE
2927 && verify_check_given_host(CUSS &ob->hosts_avoid_pipelining, sx->conn_args.host) != OK)
2928 smtp_peer_options |= OPTION_PIPE;
2930 DEBUG(D_transport) debug_printf("%susing PIPELINING\n",
2931 smtp_peer_options & OPTION_PIPE ? "" : "not ");
2933 if ( sx->peer_offered & OPTION_CHUNKING
2934 && verify_check_given_host(CUSS &ob->hosts_try_chunking, sx->conn_args.host) != OK)
2935 sx->peer_offered &= ~OPTION_CHUNKING;
2937 if (sx->peer_offered & OPTION_CHUNKING)
2938 DEBUG(D_transport) debug_printf("CHUNKING usable\n");
2940 #ifndef DISABLE_PRDR
2941 if ( sx->peer_offered & OPTION_PRDR
2942 && verify_check_given_host(CUSS &ob->hosts_try_prdr, sx->conn_args.host) != OK)
2943 sx->peer_offered &= ~OPTION_PRDR;
2945 if (sx->peer_offered & OPTION_PRDR)
2946 DEBUG(D_transport) debug_printf("PRDR usable\n");
2949 /* Note if the server supports DSN */
2950 smtp_peer_options |= sx->peer_offered & OPTION_DSN;
2951 DEBUG(D_transport) debug_printf("%susing DSN\n",
2952 sx->peer_offered & OPTION_DSN ? "" : "not ");
2954 #ifndef DISABLE_PIPE_CONNECT
2955 if ( sx->early_pipe_ok
2956 && !sx->early_pipe_active
2957 && tls_out.active.sock >= 0
2958 && smtp_peer_options & OPTION_PIPE
2959 && ( sx->ehlo_resp.cleartext_features | sx->ehlo_resp.crypted_features)
2960 & OPTION_EARLY_PIPE)
2962 DEBUG(D_transport) debug_printf("PIPECONNECT usable in future for this IP\n");
2963 sx->ehlo_resp.crypted_auths = study_ehlo_auths(sx);
2964 write_ehlo_cache_entry(sx);
2968 /* Note if the response to EHLO specifies support for the AUTH extension.
2969 If it has, check that this host is one we want to authenticate to, and do
2970 the business. The host name and address must be available when the
2971 authenticator's client driver is running. */
2973 switch (yield = smtp_auth(sx))
2975 default: goto SEND_QUIT;
2977 case FAIL_SEND: goto SEND_FAILED;
2978 case FAIL: goto RESPONSE_FAILED;
2982 sx->pipelining_used = pipelining_active = !!(smtp_peer_options & OPTION_PIPE);
2984 /* The setting up of the SMTP call is now complete. Any subsequent errors are
2985 message-specific. */
2987 sx->setting_up = FALSE;
2990 if (sx->addrlist->prop.utf8_msg)
2994 /* If the transport sets a downconversion mode it overrides any set by ACL
2997 if ((s = ob->utf8_downconvert))
2999 if (!(s = expand_string(s)))
3001 message = string_sprintf("failed to expand utf8_downconvert: %s",
3002 expand_string_message);
3003 set_errno_nohost(sx->addrlist, ERRNO_EXPANDFAIL, message, DEFER, FALSE, &sx->delivery_start);
3009 case '1': sx->addrlist->prop.utf8_downcvt = TRUE;
3010 sx->addrlist->prop.utf8_downcvt_maybe = FALSE;
3012 case '0': sx->addrlist->prop.utf8_downcvt = FALSE;
3013 sx->addrlist->prop.utf8_downcvt_maybe = FALSE;
3015 case '-': if (s[1] == '1')
3017 sx->addrlist->prop.utf8_downcvt = FALSE;
3018 sx->addrlist->prop.utf8_downcvt_maybe = TRUE;
3024 sx->utf8_needed = !sx->addrlist->prop.utf8_downcvt
3025 && !sx->addrlist->prop.utf8_downcvt_maybe;
3026 DEBUG(D_transport) if (!sx->utf8_needed)
3027 debug_printf("utf8: %s downconvert\n",
3028 sx->addrlist->prop.utf8_downcvt ? "mandatory" : "optional");
3031 /* If this is an international message we need the host to speak SMTPUTF8 */
3032 if (sx->utf8_needed && !(sx->peer_offered & OPTION_UTF8))
3034 errno = ERRNO_UTF8_FWD;
3035 goto RESPONSE_FAILED;
3037 #endif /*SUPPORT_I18N*/
3046 if (errno == ECONNREFUSED) /* first-read error on a TFO conn */
3048 /* There is a testing facility for simulating a connection timeout, as I
3049 can't think of any other way of doing this. It converts a connection
3050 refused into a timeout if the timeout is set to 999999. This is done for
3051 a 3whs connection in ip_connect(), but a TFO connection does not error
3052 there - instead it gets ECONNREFUSED on the first data read. Tracking
3053 that a TFO really was done is too hard, or we would set a
3054 sx->pending_conn_done bit and test that in smtp_reap_banner() and
3055 smtp_reap_ehlo(). That would let us also add the conn-timeout to the
3058 if (f.running_in_test_harness && ob->connect_timeout == 999999)
3060 set_errno_nohost(sx->addrlist,
3061 errno == ETIMEDOUT ? ERRNO_CONNECTTIMEOUT : errno,
3062 sx->verify ? US strerror(errno) : NULL,
3063 DEFER, FALSE, &sx->delivery_start);
3064 sx->send_quit = FALSE;
3068 /* really an error on an SMTP read */
3070 sx->send_quit = check_response(sx->conn_args.host, &errno, sx->addrlist->more_errno,
3071 sx->buffer, &code, &message, &pass_message);
3077 message = US string_sprintf("smtp send to %s [%s] failed: %s",
3078 sx->conn_args.host->name, sx->conn_args.host->address, strerror(errno));
3079 sx->send_quit = FALSE;
3085 message = string_sprintf("Remote host closed connection in response to %s"
3086 " (EHLO response was: %s)", smtp_command, sx->buffer);
3087 sx->send_quit = FALSE;
3091 /* This label is jumped to directly when a TLS negotiation has failed,
3092 or was not done for a host for which it is required. Values will be set
3093 in message and errno, and setting_up will always be true. Treat as
3094 a temporary error. */
3098 code = '4', yield = DEFER;
3102 /* The failure happened while setting up the call; see if the failure was
3103 a 5xx response (this will either be on connection, or following HELO - a 5xx
3104 after EHLO causes it to try HELO). If so, and there are no more hosts to try,
3105 fail all addresses, as this host is never going to accept them. For other
3106 errors during setting up (timeouts or whatever), defer all addresses, and
3107 yield DEFER, so that the host is not tried again for a while.
3109 XXX This peeking for another host feels like a layering violation. We want
3110 to note the host as unusable, but down here we shouldn't know if this was
3111 the last host to try for the addr(list). Perhaps the upper layer should be
3112 the one to do set_errno() ? The problem is that currently the addr is where
3113 errno etc. are stashed, but until we run out of hosts to try the errors are
3114 host-specific. Maybe we should enhance the host_item definition? */
3117 sx->ok = FALSE; /* For when reached by GOTO */
3118 set_errno(sx->addrlist, errno, message,
3119 sx->conn_args.host->next
3123 || errno == ERRNO_UTF8_FWD
3127 errno == ECONNREFUSED ? NULL : sx->conn_args.host,
3128 #ifdef EXPERIMENTAL_DSN_INFO
3129 sx->smtp_greeting, sx->helo_response,
3131 &sx->delivery_start);
3138 (void)smtp_write_command(sx, SCMD_FLUSH, "QUIT\r\n");
3141 if (sx->cctx.tls_ctx)
3143 if (sx->send_tlsclose)
3145 tls_close(sx->cctx.tls_ctx, TLS_SHUTDOWN_NOWAIT);
3146 sx->send_tlsclose = FALSE;
3148 sx->cctx.tls_ctx = NULL;
3152 /* Close the socket, and return the appropriate value, first setting
3153 works because the NULL setting is passed back to the calling process, and
3154 remote_max_parallel is forced to 1 when delivering over an existing connection,
3157 HDEBUG(D_transport|D_acl|D_v) debug_printf_indent(" SMTP(close)>>\n");
3160 shutdown(sx->cctx.sock, SHUT_WR);
3161 if (fcntl(sx->cctx.sock, F_SETFL, O_NONBLOCK) == 0)
3162 for (int i = 16; read(sx->cctx.sock, sx->inbuffer, sizeof(sx->inbuffer)) > 0 && i > 0;)
3163 i--; /* drain socket */
3164 sx->send_quit = FALSE;
3166 (void)close(sx->cctx.sock);
3169 #ifndef DISABLE_EVENT
3170 (void) event_raise(sx->conn_args.tblock->event_action, US"tcp:close", NULL, NULL);
3173 continue_transport = NULL;
3174 continue_hostname = NULL;
3181 /* Create the string of options that will be appended to the MAIL FROM:
3182 in the connection context buffer */
3185 build_mailcmd_options(smtp_context * sx, address_item * addrlist)
3187 uschar * p = sx->buffer;
3188 address_item * addr;
3193 /* If we know the receiving MTA supports the SIZE qualification, and we know it,
3194 send it, adding something to the message size to allow for imprecision
3195 and things that get added en route. Exim keeps the number of lines
3196 in a message, so we can give an accurate value for the original message, but we
3197 need some additional to handle added headers. (Double "." characters don't get
3198 included in the count.) */
3200 if ( message_size > 0
3201 && sx->peer_offered & OPTION_SIZE && !(sx->avoid_option & OPTION_SIZE))
3203 /*XXX problem here under spool_files_wireformat?
3204 Or just forget about lines? Or inflate by a fixed proportion? */
3206 sprintf(CS p, " SIZE=%d", message_size+message_linecount+(SOB sx->conn_args.ob)->size_addition);
3210 #ifndef DISABLE_PRDR
3211 /* If it supports Per-Recipient Data Responses, and we have more than one recipient,
3214 sx->prdr_active = FALSE;
3215 if (sx->peer_offered & OPTION_PRDR)
3216 for (address_item * addr = addrlist; addr; addr = addr->next)
3217 if (addr->transport_return == PENDING_DEFER)
3219 for (addr = addr->next; addr; addr = addr->next)
3220 if (addr->transport_return == PENDING_DEFER)
3221 { /* at least two recipients to send */
3222 sx->prdr_active = TRUE;
3223 sprintf(CS p, " PRDR"); p += 5;
3231 /* If it supports internationalised messages, and this meesage need that,
3234 if ( sx->peer_offered & OPTION_UTF8
3235 && addrlist->prop.utf8_msg
3236 && !addrlist->prop.utf8_downcvt
3238 Ustrcpy(p, US" SMTPUTF8"), p += 9;
3241 /* check if all addresses have DSN-lasthop flag; do not send RET and ENVID if so */
3242 for (sx->dsn_all_lasthop = TRUE, addr = addrlist, address_count = 0;
3243 addr && address_count < sx->max_rcpt; /*XXX maybe also || sx->single_rcpt_domain ? */
3244 addr = addr->next) if (addr->transport_return == PENDING_DEFER)
3247 if (!(addr->dsn_flags & rf_dsnlasthop))
3249 sx->dsn_all_lasthop = FALSE;
3254 /* Add any DSN flags to the mail command */
3256 if (sx->peer_offered & OPTION_DSN && !sx->dsn_all_lasthop)
3258 if (dsn_ret == dsn_ret_hdrs)
3259 { Ustrcpy(p, US" RET=HDRS"); p += 9; }
3260 else if (dsn_ret == dsn_ret_full)
3261 { Ustrcpy(p, US" RET=FULL"); p += 9; }
3265 string_format(p, sizeof(sx->buffer) - (p-sx->buffer), " ENVID=%s", dsn_envid);
3270 /* If an authenticated_sender override has been specified for this transport
3271 instance, expand it. If the expansion is forced to fail, and there was already
3272 an authenticated_sender for this message, the original value will be used.
3273 Other expansion failures are serious. An empty result is ignored, but there is
3274 otherwise no check - this feature is expected to be used with LMTP and other
3275 cases where non-standard addresses (e.g. without domains) might be required. */
3277 return smtp_mail_auth_str(sx, p, addrlist) ? ERROR : OK;
3282 build_rcptcmd_options(smtp_context * sx, const address_item * addr)
3284 uschar * p = sx->buffer;
3287 /* Add any DSN flags to the rcpt command */
3289 if (sx->peer_offered & OPTION_DSN && !(addr->dsn_flags & rf_dsnlasthop))
3291 if (addr->dsn_flags & rf_dsnflags)
3295 Ustrcpy(p, US" NOTIFY=");
3297 for (int i = 0; i < nelem(rf_list); i++) if (addr->dsn_flags & rf_list[i])
3299 if (!first) *p++ = ',';
3301 Ustrcpy(p, rf_names[i]);
3306 if (addr->dsn_orcpt)
3308 string_format(p, sizeof(sx->buffer) - (p-sx->buffer), " ORCPT=%s",
3319 0 good, rcpt results in addr->transport_return (PENDING_OK, DEFER, FAIL)
3320 -1 MAIL response error
3321 -2 any non-MAIL read i/o error
3322 -3 non-MAIL response timeout
3323 -4 internal error; channel still usable
3328 smtp_write_mail_and_rcpt_cmds(smtp_context * sx, int * yield)
3330 address_item * addr;
3331 #ifdef EXPERIMENTAL_ESMTP_LIMITS
3332 address_item * restart_addr = NULL;
3334 int address_count, pipe_limit;
3337 if (build_mailcmd_options(sx, sx->first_addr) != OK)
3343 /* From here until we send the DATA command, we can make use of PIPELINING
3344 if the server host supports it. The code has to be able to check the responses
3345 at any point, for when the buffer fills up, so we write it totally generally.
3346 When PIPELINING is off, each command written reports that it has flushed the
3349 sx->pending_MAIL = TRUE; /* The block starts with MAIL */
3352 uschar * s = sx->from_addr;
3354 uschar * errstr = NULL;
3356 /* If we must downconvert, do the from-address here. Remember we had to
3357 for the to-addresses (done below), and also (ugly) for re-doing when building
3358 the delivery log line. */
3360 if ( sx->addrlist->prop.utf8_msg
3361 && (sx->addrlist->prop.utf8_downcvt || !(sx->peer_offered & OPTION_UTF8))
3364 if (s = string_address_utf8_to_alabel(s, &errstr), errstr)
3366 set_errno_nohost(sx->addrlist, ERRNO_EXPANDFAIL, errstr, DEFER, FALSE, &sx->delivery_start);
3370 setflag(sx->addrlist, af_utf8_downcvt);
3374 rc = smtp_write_command(sx, pipelining_active ? SCMD_BUFFER : SCMD_FLUSH,
3375 "MAIL FROM:<%s>%s\r\n", s, sx->buffer);
3378 mail_command = string_copy(big_buffer); /* Save for later error message */
3382 case -1: /* Transmission error */
3385 case +1: /* Cmd was sent */
3386 if (!smtp_read_response(sx, sx->buffer, sizeof(sx->buffer), '2',
3387 (SOB sx->conn_args.ob)->command_timeout))
3389 if (errno == 0 && sx->buffer[0] == '4')
3391 errno = ERRNO_MAIL4XX;
3392 sx->addrlist->more_errno |= ((sx->buffer[1] - '0')*10 + sx->buffer[2] - '0') << 8;
3396 sx->pending_MAIL = FALSE;
3399 /* otherwise zero: command queued for pipeline */
3402 /* Pass over all the relevant recipient addresses for this host, which are the
3403 ones that have status PENDING_DEFER. If we are using PIPELINING, we can send
3404 several before we have to read the responses for those seen so far. This
3405 checking is done by a subroutine because it also needs to be done at the end.
3406 Send only up to max_rcpt addresses at a time, leaving next_addr pointing to
3407 the next one if not all are sent.
3409 In the MUA wrapper situation, we want to flush the PIPELINING buffer for the
3410 last address because we want to abort if any recipients have any kind of
3411 problem, temporary or permanent. We know that all recipient addresses will have
3412 the PENDING_DEFER status, because only one attempt is ever made, and we know
3413 that max_rcpt will be large, so all addresses will be done at once.
3415 For verify we flush the pipeline after any (the only) rcpt address. */
3417 for (addr = sx->first_addr, address_count = 0, pipe_limit = 100;
3418 addr && address_count < sx->max_rcpt;
3419 addr = addr->next) if (addr->transport_return == PENDING_DEFER)
3425 #ifdef EXPERIMENTAL_ESMTP_LIMITS
3426 if ( sx->single_rcpt_domain /* restriction on domains */
3427 && address_count > 0 /* not first being sent */
3428 && Ustrcmp(addr->domain, sx->first_addr->domain) != 0 /* dom diff from first */
3431 DEBUG(D_transport) debug_printf("skipping different domain %s\n", addr->domain);
3433 /* Ensure the smtp-response reaper does not think the address had a RCPT
3434 command sent for it. Reset to PENDING_DEFER in smtp_deliver(), where we
3435 goto SEND_MESSAGE. */
3437 addr->transport_return = SKIP;
3438 if (!restart_addr) restart_addr = addr; /* note restart point */
3439 continue; /* skip this one */
3443 addr->dsn_aware = sx->peer_offered & OPTION_DSN
3444 ? dsn_support_yes : dsn_support_no;
3447 if (pipe_limit-- <= 0)
3448 { no_flush = FALSE; pipe_limit = 100; }
3450 no_flush = pipelining_active && !sx->verify
3451 && (!mua_wrapper || addr->next && address_count < sx->max_rcpt);
3453 build_rcptcmd_options(sx, addr);
3455 /* Now send the RCPT command, and process outstanding responses when
3456 necessary. After a timeout on RCPT, we just end the function, leaving the
3457 yield as OK, because this error can often mean that there is a problem with
3458 just one address, so we don't want to delay the host. */
3460 rcpt_addr = transport_rcpt_address(addr, sx->conn_args.tblock->rcpt_include_affixes);
3463 if ( testflag(sx->addrlist, af_utf8_downcvt)
3464 && !(rcpt_addr = string_address_utf8_to_alabel(rcpt_addr, NULL))
3467 /*XXX could we use a per-address errstr here? Not fail the whole send? */
3468 errno = ERRNO_EXPANDFAIL;
3469 return -5; /*XXX too harsh? */
3473 cmds_sent = smtp_write_command(sx, no_flush ? SCMD_BUFFER : SCMD_FLUSH,
3474 "RCPT TO:<%s>%s%s\r\n", rcpt_addr, sx->igquotstr, sx->buffer);
3476 if (cmds_sent < 0) return -5;
3479 switch(sync_responses(sx, cmds_sent, 0))
3481 case 3: sx->ok = TRUE; /* 2xx & 5xx => OK & progress made */
3482 case 2: sx->completed_addr = TRUE; /* 5xx (only) => progress made */
3485 case 1: sx->ok = TRUE; /* 2xx (only) => OK, but if LMTP, */
3486 if (!sx->lmtp) /* can't tell about progress yet */
3487 sx->completed_addr = TRUE;
3488 case 0: /* No 2xx or 5xx, but no probs */
3489 /* If any RCPT got a 452 response then next_addr has been updated
3490 for restarting with a new MAIL on the same connection. Send no more
3491 RCPTs for this MAIL. */
3495 DEBUG(D_transport) debug_printf("seen 452 too-many-rcpts\n");
3496 sx->RCPT_452 = FALSE;
3497 /* sx->next_addr has been reset for fast_retry */
3502 case -1: return -3; /* Timeout on RCPT */
3503 case -2: return -2; /* non-MAIL read i/o error */
3504 default: return -1; /* any MAIL error */
3506 #ifndef DISABLE_PIPE_CONNECT
3507 case -4: return -1; /* non-2xx for pipelined banner or EHLO */
3508 case -5: return -1; /* TLS first-read error */
3512 } /* Loop for next address */
3514 #ifdef EXPERIMENTAL_ESMTP_LIMITS
3515 sx->next_addr = restart_addr ? restart_addr : addr;
3517 sx->next_addr = addr;
3524 /*****************************************************
3525 * Proxy TLS connection for another transport process *
3526 ******************************************************/
3528 Close the unused end of the pipe, fork once more, then use the given buffer
3529 as a staging area, and select on both the given fd and the TLS'd client-fd for
3530 data to read (per the coding in ip_recv() and fd_ready() this is legitimate).
3531 Do blocking full-size writes, and reads under a timeout. Once both input
3532 channels are closed, exit the process.
3536 buf space to use for buffering
3537 bufsiz size of buffer
3538 pfd pipe filedescriptor array; [0] is comms to proxied process
3539 timeout per-read timeout, seconds
3545 smtp_proxy_tls(void * ct_ctx, uschar * buf, size_t bsize, int * pfd,
3548 struct pollfd p[2] = {{.fd = tls_out.active.sock, .events = POLLIN},
3549 {.fd = pfd[0], .events = POLLIN}};
3551 BOOL send_tls_shutdown = TRUE;
3554 if ((rc = exim_fork(US"tls-proxy")))
3555 _exit(rc < 0 ? EXIT_FAILURE : EXIT_SUCCESS);
3557 set_process_info("proxying TLS connection for continued transport");
3561 time_t time_left = timeout;
3562 time_t time_start = time(NULL);
3567 rc = poll(p, 2, time_left * 1000);
3569 if (rc < 0 && errno == EINTR)
3570 if ((time_left -= time(NULL) - time_start) > 0) continue;
3574 DEBUG(D_transport) if (rc == 0) debug_printf("%s: timed out\n", __FUNCTION__);
3578 /* For errors where not readable, bomb out */
3580 if (p[0].revents & POLLERR || p[1].revents & POLLERR)
3582 DEBUG(D_transport) debug_printf("select: exceptional cond on %s fd\n",
3583 p[0].revents & POLLERR ? "tls" : "proxy");
3584 if (!(p[0].revents & POLLIN || p[1].events & POLLIN))
3586 DEBUG(D_transport) debug_printf("- but also readable; no exit yet\n");
3589 while (rc < 0 || !(p[0].revents & POLLIN || p[1].revents & POLLIN));
3591 /* handle inbound data */
3592 if (p[0].revents & POLLIN)
3593 if ((rc = tls_read(ct_ctx, buf, bsize)) <= 0) /* Expect -1 for EOF; */
3594 { /* that reaps the TLS Close Notify record */
3596 shutdown(pfd[0], SHUT_WR);
3600 for (int nbytes = 0; rc - nbytes > 0; nbytes += i)
3601 if ((i = write(pfd[0], buf + nbytes, rc - nbytes)) < 0) goto done;
3603 /* Handle outbound data. We cannot combine payload and the TLS-close
3604 due to the limitations of the (pipe) channel feeding us. Maybe use a unix-domain
3606 if (p[1].revents & POLLIN)
3607 if ((rc = read(pfd[0], buf, bsize)) <= 0)
3611 # ifdef EXIM_TCP_CORK /* Use _CORK to get TLS Close Notify in FIN segment */
3612 (void) setsockopt(tls_out.active.sock, IPPROTO_TCP, EXIM_TCP_CORK, US &on, sizeof(on));
3614 tls_shutdown_wr(ct_ctx);
3615 send_tls_shutdown = FALSE;
3616 shutdown(tls_out.active.sock, SHUT_WR);
3619 for (int nbytes = 0; rc - nbytes > 0; nbytes += i)
3620 if ((i = tls_write(ct_ctx, buf + nbytes, rc - nbytes, FALSE)) < 0)
3623 while (p[0].fd >= 0 || p[1].fd >= 0);
3626 if (send_tls_shutdown) tls_close(ct_ctx, TLS_SHUTDOWN_NOWAIT);
3628 testharness_pause_ms(100); /* let logging complete */
3629 exim_exit(EXIT_SUCCESS);
3634 /*************************************************
3635 * Deliver address list to given host *
3636 *************************************************/
3638 /* If continue_hostname is not null, we get here only when continuing to
3639 deliver down an existing channel. The channel was passed as the standard
3640 input. TLS is never active on a passed channel; the previous process either
3641 closes it down before passing the connection on, or inserts a TLS-proxy
3642 process and passes on a cleartext conection.
3644 Otherwise, we have to make a connection to the remote host, and do the
3645 initial protocol exchange.
3647 When running as an MUA wrapper, if the sender or any recipient is rejected,
3648 temporarily or permanently, we force failure for all recipients.
3651 addrlist chain of potential addresses to deliver; only those whose
3652 transport_return field is set to PENDING_DEFER are currently
3653 being processed; others should be skipped - they have either
3654 been delivered to an earlier host or IP address, or been
3655 failed by one of them.
3656 host host to deliver to
3657 host_af AF_INET or AF_INET6
3658 defport default TCP/IP port to use if host does not specify, in host
3660 interface interface to bind to, or NULL
3661 tblock transport instance block
3662 message_defer set TRUE if yield is OK, but all addresses were deferred
3663 because of a non-recipient, non-host failure, that is, a
3664 4xx response to MAIL FROM, DATA, or ".". This is a defer
3665 that is specific to the message.
3666 suppress_tls if TRUE, don't attempt a TLS connection - this is set for
3667 a second attempt after TLS initialization fails
3669 Returns: OK - the connection was made and the delivery attempted;
3670 the result for each address is in its data block.
3671 DEFER - the connection could not be made, or something failed
3672 while setting up the SMTP session, or there was a
3673 non-message-specific error, such as a timeout.
3674 ERROR - a filter command is specified for this transport,
3675 and there was a problem setting it up; OR helo_data
3676 or add_headers or authenticated_sender is specified
3677 for this transport, and the string failed to expand
3679 For all non-OK returns the first addr of the list carries the
3680 time taken for the attempt.
3684 smtp_deliver(address_item *addrlist, host_item *host, int host_af, int defport,
3685 uschar *interface, transport_instance *tblock,
3686 BOOL *message_defer, BOOL suppress_tls)
3688 smtp_transport_options_block * ob = SOB tblock->options_block;
3693 uschar *message = NULL;
3694 uschar new_message_id[MESSAGE_ID_LENGTH + 1];
3695 smtp_context * sx = store_get(sizeof(*sx), GET_TAINTED); /* tainted, for the data buffers */
3696 BOOL pass_message = FALSE;
3697 #ifdef EXPERIMENTAL_ESMTP_LIMITS
3698 BOOL mail_limit = FALSE;
3703 BOOL tcw_done = FALSE, tcw = FALSE;
3705 *message_defer = FALSE;
3707 memset(sx, 0, sizeof(*sx));
3708 sx->addrlist = addrlist;
3709 sx->conn_args.host = host;
3710 sx->conn_args.host_af = host_af;
3712 sx->conn_args.interface = interface;
3713 sx->helo_data = NULL;
3714 sx->conn_args.tblock = tblock;
3715 gettimeofday(&sx->delivery_start, NULL);
3716 sx->sync_addr = sx->first_addr = addrlist;
3723 /* Get the channel set up ready for a message, MAIL FROM being the next
3724 SMTP command to send. */
3726 if ((rc = smtp_setup_conn(sx, suppress_tls)) != OK)
3728 timesince(&addrlist->delivery_time, &sx->delivery_start);
3734 /* If the connection used DANE, ignore for now any addresses with incompatible
3735 domains. The SNI has to be the domain. Arrange a whole new TCP conn later,
3736 just in case only TLS isn't enough. */
3738 if (sx->conn_args.dane)
3740 const uschar * dane_domain = sx->first_addr->domain;
3742 for (address_item * a = sx->first_addr->next; a; a = a->next)
3743 if ( a->transport_return == PENDING_DEFER
3744 && Ustrcmp(dane_domain, a->domain) != 0)
3746 DEBUG(D_transport) debug_printf("DANE: holding %s for later\n", a->domain);
3748 a->transport_return = DANE;
3753 /* If there is a filter command specified for this transport, we can now
3754 set it up. This cannot be done until the identity of the host is known. */
3756 if (tblock->filter_command)
3758 transport_filter_timeout = tblock->filter_timeout;
3760 /* On failure, copy the error to all addresses, abandon the SMTP call, and
3763 if (!transport_set_up_command(&transport_filter_argv,
3764 tblock->filter_command, TRUE, DEFER, addrlist,
3765 string_sprintf("%.50s transport filter", tblock->name), NULL))
3767 set_errno_nohost(addrlist->next, addrlist->basic_errno, addrlist->message, DEFER,
3768 FALSE, &sx->delivery_start);
3773 if ( transport_filter_argv
3774 && *transport_filter_argv
3775 && **transport_filter_argv
3776 && sx->peer_offered & OPTION_CHUNKING
3777 #ifndef DISABLE_DKIM
3778 /* When dkim signing, chunking is handled even with a transport-filter */
3779 && !(ob->dkim.dkim_private_key && ob->dkim.dkim_domain && ob->dkim.dkim_selector)
3780 && !ob->dkim.force_bodyhash
3784 sx->peer_offered &= ~OPTION_CHUNKING;
3785 DEBUG(D_transport) debug_printf("CHUNKING not usable due to transport filter\n");
3789 /* For messages that have more than the maximum number of envelope recipients,
3790 we want to send several transactions down the same SMTP connection. (See
3791 comments in deliver.c as to how this reconciles, heuristically, with
3792 remote_max_parallel.) This optimization was added to Exim after the following
3793 code was already working. The simplest way to put it in without disturbing the
3794 code was to use a goto to jump back to this point when there is another
3795 transaction to handle. */
3798 sx->from_addr = return_path;
3799 sx->sync_addr = sx->first_addr;
3801 sx->send_rset = TRUE;
3802 sx->completed_addr = FALSE;
3805 /* If we are a continued-connection-after-verify the MAIL and RCPT
3806 commands were already sent; do not re-send but do mark the addrs as
3807 having been accepted up to RCPT stage. A traditional cont-conn
3808 always has a sequence number greater than one. */
3810 if (continue_hostname && continue_sequence == 1)
3812 /* sx->pending_MAIL = FALSE; */
3814 /* sx->next_addr = NULL; */
3816 for (address_item * addr = addrlist; addr; addr = addr->next)
3817 addr->transport_return = PENDING_OK;
3821 /* Initiate a message transfer. */
3823 switch(smtp_write_mail_and_rcpt_cmds(sx, &yield))
3826 case -1: case -2: goto RESPONSE_FAILED;
3827 case -3: goto END_OFF;
3828 case -4: goto SEND_QUIT;
3829 default: goto SEND_FAILED;
3832 /* If we are an MUA wrapper, abort if any RCPTs were rejected, either
3833 permanently or temporarily. We should have flushed and synced after the last
3841 for (a = sx->first_addr, cnt = 0; a && cnt < sx->max_rcpt; a = a->next, cnt++)
3842 if (a->transport_return != PENDING_OK)
3844 /*XXX could we find a better errno than 0 here? */
3845 set_errno_nohost(addrlist, 0, a->message, FAIL,
3846 testflag(a, af_pass_message), &sx->delivery_start);
3853 /* If ok is TRUE, we know we have got at least one good recipient, and must now
3854 send DATA, but if it is FALSE (in the normal, non-wrapper case), we may still
3855 have a good recipient buffered up if we are pipelining. We don't want to waste
3856 time sending DATA needlessly, so we only send it if either ok is TRUE or if we
3857 are pipelining. The responses are all handled by sync_responses().
3858 If using CHUNKING, do not send a BDAT until we know how big a chunk we want
3861 if ( !(sx->peer_offered & OPTION_CHUNKING)
3862 && (sx->ok || (pipelining_active && !mua_wrapper)))
3864 int count = smtp_write_command(sx, SCMD_FLUSH, "DATA\r\n");
3866 if (count < 0) goto SEND_FAILED;
3867 switch(sync_responses(sx, count, sx->ok ? +1 : -1))
3869 case 3: sx->ok = TRUE; /* 2xx & 5xx => OK & progress made */
3870 case 2: sx->completed_addr = TRUE; /* 5xx (only) => progress made */
3873 case 1: sx->ok = TRUE; /* 2xx (only) => OK, but if LMTP, */
3874 if (!sx->lmtp) sx->completed_addr = TRUE; /* can't tell about progress yet */
3875 case 0: break; /* No 2xx or 5xx, but no probs */
3877 case -1: goto END_OFF; /* Timeout on RCPT */
3879 #ifndef DISABLE_PIPE_CONNECT
3880 case -5: /* TLS first-read error */
3881 case -4: HDEBUG(D_transport)
3882 debug_printf("failed reaping pipelined cmd responses\n");
3884 default: goto RESPONSE_FAILED; /* I/O error, or any MAIL/DATA error */
3886 pipelining_active = FALSE;
3887 data_command = string_copy(big_buffer); /* Save for later error message */
3890 /* If there were no good recipients (but otherwise there have been no
3891 problems), just set ok TRUE, since we have handled address-specific errors
3892 already. Otherwise, it's OK to send the message. Use the check/escape mechanism
3893 for handling the SMTP dot-handling protocol, flagging to apply to headers as
3894 well as body. Set the appropriate timeout value to be used for each chunk.
3895 (Haven't been able to make it work using select() for writing yet.) */
3898 && (!(sx->peer_offered & OPTION_CHUNKING) || !pipelining_active))
3900 /* Save the first address of the next batch. */
3901 sx->first_addr = sx->next_addr;
3907 transport_ctx tctx = {
3908 .u = {.fd = sx->cctx.sock}, /*XXX will this need TLS info? */
3911 .check_string = US".",
3912 .escape_string = US"..", /* Escaping strings */
3914 topt_use_crlf | topt_escape_headers
3915 | (tblock->body_only ? topt_no_headers : 0)
3916 | (tblock->headers_only ? topt_no_body : 0)
3917 | (tblock->return_path_add ? topt_add_return_path : 0)
3918 | (tblock->delivery_date_add ? topt_add_delivery_date : 0)
3919 | (tblock->envelope_to_add ? topt_add_envelope_to : 0)
3922 /* If using CHUNKING we need a callback from the generic transport
3923 support to us, for the sending of BDAT smtp commands and the reaping
3924 of responses. The callback needs a whole bunch of state so set up
3925 a transport-context structure to be passed around. */
3927 if (sx->peer_offered & OPTION_CHUNKING)
3929 tctx.check_string = tctx.escape_string = NULL;
3930 tctx.options |= topt_use_bdat;
3931 tctx.chunk_cb = smtp_chunk_cmd_callback;
3932 sx->pending_BDAT = FALSE;
3933 sx->good_RCPT = sx->ok;
3935 tctx.smtp_context = sx;
3938 tctx.options |= topt_end_dot;
3940 /* Save the first address of the next batch. */
3941 sx->first_addr = sx->next_addr;
3943 /* Responses from CHUNKING commands go in buffer. Otherwise,
3944 there has not been a response. */
3948 sigalrm_seen = FALSE;
3949 transport_write_timeout = ob->data_timeout;
3950 smtp_command = US"sending data block"; /* For error messages */
3951 DEBUG(D_transport|D_v)
3952 if (sx->peer_offered & OPTION_CHUNKING)
3953 debug_printf(" will write message using CHUNKING\n");
3955 debug_printf(" SMTP>> writing message and terminating \".\"\n");
3956 transport_count = 0;
3958 #ifndef DISABLE_DKIM
3960 # ifdef MEASURE_TIMING
3962 gettimeofday(&t0, NULL);
3964 dkim_exim_sign_init();
3965 # ifdef EXPERIMENTAL_ARC
3967 uschar * s = ob->arc_sign;
3970 if (!(ob->dkim.arc_signspec = s = expand_string(s)))
3972 if (!f.expand_string_forcedfail)
3974 message = US"failed to expand arc_sign";
3981 /* Ask dkim code to hash the body for ARC */
3982 (void) arc_ams_setup_sign_bodyhash();
3983 ob->dkim.force_bodyhash = TRUE;
3988 # ifdef MEASURE_TIMING
3989 report_time_since(&t0, US"dkim_exim_sign_init (delta)");
3994 /* See if we can pipeline QUIT. Reasons not to are
3995 - pipelining not active
3996 - not ok to send quit
3997 - errors in amtp transation responses
3998 - more addrs to send for this message or this host
3999 - this message was being retried
4000 - more messages for this host
4001 If we can, we want the message-write to not flush (the tail end of) its data out. */
4003 if ( sx->pipelining_used
4004 && (sx->ok && sx->completed_addr || sx->peer_offered & OPTION_CHUNKING)
4006 && !(sx->first_addr || f.continue_more)
4007 && f.deliver_firsttime
4010 smtp_compare_t t_compare =
4011 {.tblock = tblock, .current_sender_address = sender_address};
4016 ( tls_out.active.sock < 0 && !continue_proxy_cipher
4017 || verify_check_given_host(CUSS &ob->hosts_nopass_tls, host) != OK
4021 transport_check_waiting(tblock->name, host->name,
4022 tblock->connection_max_messages, new_message_id,
4023 (oicf)smtp_are_same_identities, (void*)&t_compare);
4026 HDEBUG(D_transport) debug_printf("will pipeline QUIT\n");
4027 tctx.options |= topt_no_flush;
4031 #ifndef DISABLE_DKIM
4032 sx->ok = dkim_transport_write_message(&tctx, &ob->dkim, CUSS &message);
4034 sx->ok = transport_write_message(&tctx, 0);
4037 /* transport_write_message() uses write() because it is called from other
4038 places to write to non-sockets. This means that under some OS (e.g. Solaris)
4039 it can exit with "Broken pipe" as its error. This really means that the
4040 socket got closed at the far end. */
4042 transport_write_timeout = 0; /* for subsequent transports */
4044 /* Failure can either be some kind of I/O disaster (including timeout),
4045 or the failure of a transport filter or the expansion of added headers.
4046 Or, when CHUNKING, it can be a protocol-detected failure. */
4049 if (message) goto SEND_FAILED;
4050 else goto RESPONSE_FAILED;
4052 /* We used to send the terminating "." explicitly here, but because of
4053 buffering effects at both ends of TCP/IP connections, you don't gain
4054 anything by keeping it separate, so it might as well go in the final
4055 data buffer for efficiency. This is now done by setting the topt_end_dot
4058 smtp_command = US"end of data";
4060 /* If we can pipeline a QUIT with the data them send it now. If a new message
4061 for this host appeared in the queue while data was being sent, we will not see
4062 it and it will have to wait for a queue run. If there was one but another
4063 thread took it, we might attempt to send it - but locking of spoolfiles will
4064 detect that. Use _MORE to get QUIT in FIN segment. */
4066 if (tcw_done && !tcw)
4068 /*XXX jgh 2021/03/10 google et. al screwup. G, at least, sends TCP FIN in response to TLS
4069 close-notify. Under TLS 1.3, violating RFC.
4070 However, TLS 1.2 does not have half-close semantics. */
4072 if ( sx->cctx.tls_ctx
4073 #if 0 && !defined(DISABLE_TLS)
4074 && Ustrcmp(tls_out.ver, "TLS1.3") != 0
4076 || !f.deliver_firsttime
4078 { /* Send QUIT now and not later */
4079 (void)smtp_write_command(sx, SCMD_FLUSH, "QUIT\r\n");
4080 sx->send_quit = FALSE;
4083 { /* add QUIT to the output buffer */
4084 (void)smtp_write_command(sx, SCMD_MORE, "QUIT\r\n");
4085 sx->send_quit = FALSE; /* avoid sending it later */
4088 if (sx->cctx.tls_ctx) /* need to send TLS Close Notify */
4090 # ifdef EXIM_TCP_CORK /* Use _CORK to get Close Notify in FIN segment */
4091 (void) setsockopt(sx->cctx.sock, IPPROTO_TCP, EXIM_TCP_CORK, US &on, sizeof(on));
4093 tls_shutdown_wr(sx->cctx.tls_ctx);
4094 sx->send_tlsclose = FALSE; /* avoid later repeat */
4097 HDEBUG(D_transport|D_acl|D_v) debug_printf_indent(" SMTP(shutdown)>>\n");
4098 shutdown(sx->cctx.sock, SHUT_WR); /* flush output buffer, with TCP FIN */
4102 if (sx->peer_offered & OPTION_CHUNKING && sx->cmd_count > 1)
4104 /* Reap any outstanding MAIL & RCPT commands, but not a DATA-go-ahead */
4105 switch(sync_responses(sx, sx->cmd_count-1, 0))
4107 case 3: sx->ok = TRUE; /* 2xx & 5xx => OK & progress made */
4108 case 2: sx->completed_addr = TRUE; /* 5xx (only) => progress made */
4111 case 1: sx->ok = TRUE; /* 2xx (only) => OK, but if LMTP, */
4112 if (!sx->lmtp) sx->completed_addr = TRUE; /* can't tell about progress yet */
4113 case 0: break; /* No 2xx or 5xx, but no probs */
4115 case -1: goto END_OFF; /* Timeout on RCPT */
4117 #ifndef DISABLE_PIPE_CONNECT
4118 case -5: /* TLS first-read error */
4119 case -4: HDEBUG(D_transport)
4120 debug_printf("failed reaping pipelined cmd responses\n");
4122 default: goto RESPONSE_FAILED; /* I/O error, or any MAIL/DATA error */
4126 #ifndef DISABLE_PRDR
4127 /* For PRDR we optionally get a partial-responses warning followed by the
4128 individual responses, before going on with the overall response. If we don't
4129 get the warning then deal with per non-PRDR. */
4133 sx->ok = smtp_read_response(sx, sx->buffer, sizeof(sx->buffer), '3', ob->final_timeout);
4134 if (!sx->ok && errno == 0) switch(sx->buffer[0])
4136 case '2': sx->prdr_active = FALSE;
4139 case '4': errno = ERRNO_DATA4XX;
4140 addrlist->more_errno |=
4141 ((sx->buffer[1] - '0')*10 + sx->buffer[2] - '0') << 8;
4148 /* For non-PRDR SMTP, we now read a single response that applies to the
4149 whole message. If it is OK, then all the addresses have been delivered. */
4153 sx->ok = smtp_read_response(sx, sx->buffer, sizeof(sx->buffer), '2',
4155 if (!sx->ok && errno == 0 && sx->buffer[0] == '4')
4157 errno = ERRNO_DATA4XX;
4158 addrlist->more_errno |= ((sx->buffer[1] - '0')*10 + sx->buffer[2] - '0') << 8;
4162 /* For LMTP, we get back a response for every RCPT command that we sent;
4163 some may be accepted and some rejected. For those that get a response, their
4164 status is fixed; any that are accepted have been handed over, even if later
4165 responses crash - at least, that's how I read RFC 2033.
4167 If all went well, mark the recipient addresses as completed, record which
4168 host/IPaddress they were delivered to, and cut out RSET when sending another
4169 message down the same channel. Write the completed addresses to the journal
4170 now so that they are recorded in case there is a crash of hardware or
4171 software before the spool gets updated. Also record the final SMTP
4172 confirmation if needed (for SMTP only). */
4177 struct timeval delivery_time;
4179 uschar * conf = NULL;
4181 timesince(&delivery_time, &sx->delivery_start);
4182 sx->send_rset = FALSE;
4183 pipelining_active = FALSE;
4185 /* Set up confirmation if needed - applies only to SMTP */
4188 #ifdef DISABLE_EVENT
4189 LOGGING(smtp_confirmation) &&
4194 const uschar * s = string_printing(sx->buffer);
4195 /* deconst cast ok here as string_printing was checked to have alloc'n'copied */
4196 conf = s == sx->buffer ? US string_copy(s) : US s;
4199 /* Process all transported addresses - for LMTP or PRDR, read a status for
4200 each one. We used to drop out at first_addr, until someone returned a 452
4201 followed by a 250... and we screwed up the accepted addresses. */
4203 for (address_item * addr = addrlist; addr; addr = addr->next)
4205 if (addr->transport_return != PENDING_OK) continue;
4207 /* LMTP - if the response fails badly (e.g. timeout), use it for all the
4208 remaining addresses. Otherwise, it's a return code for just the one
4209 address. For temporary errors, add a retry item for the address so that
4210 it doesn't get tried again too soon. */
4212 #ifndef DISABLE_PRDR
4213 if (sx->lmtp || sx->prdr_active)
4218 if (!smtp_read_response(sx, sx->buffer, sizeof(sx->buffer), '2',
4221 if (errno != 0 || sx->buffer[0] == 0) goto RESPONSE_FAILED;
4222 addr->message = string_sprintf(
4223 #ifndef DISABLE_PRDR
4224 "%s error after %s: %s", sx->prdr_active ? "PRDR":"LMTP",
4226 "LMTP error after %s: %s",
4228 data_command, string_printing(sx->buffer));
4229 setflag(addr, af_pass_message); /* Allow message to go to user */
4230 if (sx->buffer[0] == '5')
4231 addr->transport_return = FAIL;
4234 errno = ERRNO_DATA4XX;
4235 addr->more_errno |= ((sx->buffer[1] - '0')*10 + sx->buffer[2] - '0') << 8;
4236 addr->transport_return = DEFER;
4237 #ifndef DISABLE_PRDR
4238 if (!sx->prdr_active)
4240 retry_add_item(addr, addr->address_retry_key, 0);
4244 sx->completed_addr = TRUE; /* NOW we can set this flag */
4245 if (LOGGING(smtp_confirmation))
4247 const uschar *s = string_printing(sx->buffer);
4248 /* deconst cast ok here as string_printing was checked to have alloc'n'copied */
4249 conf = (s == sx->buffer) ? US string_copy(s) : US s;
4253 /* SMTP, or success return from LMTP for this address. Pass back the
4254 actual host that was used. */
4256 addr->transport_return = OK;
4257 addr->host_used = host;
4258 addr->delivery_time = delivery_time;
4259 addr->special_action = flag;
4260 addr->message = conf;
4262 if (tcp_out_fastopen)
4264 setflag(addr, af_tcp_fastopen_conn);
4265 if (tcp_out_fastopen >= TFO_USED_NODATA) setflag(addr, af_tcp_fastopen);
4266 if (tcp_out_fastopen >= TFO_USED_DATA) setflag(addr, af_tcp_fastopen_data);
4268 if (sx->pipelining_used) setflag(addr, af_pipelining);
4269 #ifndef DISABLE_PIPE_CONNECT
4270 if (sx->early_pipe_active) setflag(addr, af_early_pipe);
4272 #ifndef DISABLE_PRDR
4273 if (sx->prdr_active) setflag(addr, af_prdr_used);
4275 if (sx->peer_offered & OPTION_CHUNKING) setflag(addr, af_chunking_used);
4278 #ifndef DISABLE_PRDR
4279 if (!sx->prdr_active)
4282 /* Update the journal. For homonymic addresses, use the base address plus
4283 the transport name. See lots of comments in deliver.c about the reasons
4284 for the complications when homonyms are involved. Just carry on after
4285 write error, as it may prove possible to update the spool file later. */
4287 if (testflag(addr, af_homonym))
4288 sprintf(CS sx->buffer, "%.500s/%s\n", addr->unique + 3, tblock->name);
4290 sprintf(CS sx->buffer, "%.500s\n", addr->unique);
4292 DEBUG(D_deliver) debug_printf("S:journalling %s", sx->buffer);
4293 len = Ustrlen(CS sx->buffer);
4294 if (write(journal_fd, sx->buffer, len) != len)
4295 log_write(0, LOG_MAIN|LOG_PANIC, "failed to write journal for "
4296 "%s: %s", sx->buffer, strerror(errno));
4300 #ifndef DISABLE_PRDR
4301 if (sx->prdr_active)
4303 const uschar * overall_message;
4305 /* PRDR - get the final, overall response. For any non-success
4306 upgrade all the address statuses. */
4308 sx->ok = smtp_read_response(sx, sx->buffer, sizeof(sx->buffer), '2',
4312 if(errno == 0 && sx->buffer[0] == '4')
4314 errno = ERRNO_DATA4XX;
4315 addrlist->more_errno |= ((sx->buffer[1] - '0')*10 + sx->buffer[2] - '0') << 8;
4317 for (address_item * addr = addrlist; addr != sx->first_addr; addr = addr->next)
4318 if (sx->buffer[0] == '5' || addr->transport_return == OK)
4319 addr->transport_return = PENDING_OK; /* allow set_errno action */
4320 goto RESPONSE_FAILED;
4323 /* Append the overall response to the individual PRDR response for logging
4324 and update the journal, or setup retry. */
4326 overall_message = string_printing(sx->buffer);
4327 for (address_item * addr = addrlist; addr != sx->first_addr; addr = addr->next)
4328 if (addr->transport_return == OK)
4329 addr->message = string_sprintf("%s\\n%s", addr->message, overall_message);
4331 for (address_item * addr = addrlist; addr != sx->first_addr; addr = addr->next)
4332 if (addr->transport_return == OK)
4334 if (testflag(addr, af_homonym))
4335 sprintf(CS sx->buffer, "%.500s/%s\n", addr->unique + 3, tblock->name);
4337 sprintf(CS sx->buffer, "%.500s\n", addr->unique);
4339 DEBUG(D_deliver) debug_printf("journalling(PRDR) %s\n", sx->buffer);
4340 len = Ustrlen(CS sx->buffer);
4341 if (write(journal_fd, sx->buffer, len) != len)
4342 log_write(0, LOG_MAIN|LOG_PANIC, "failed to write journal for "
4343 "%s: %s", sx->buffer, strerror(errno));
4345 else if (addr->transport_return == DEFER)
4346 /*XXX magic value -2 ? maybe host+message ? */
4347 retry_add_item(addr, addr->address_retry_key, -2);
4351 /* Ensure the journal file is pushed out to disk. */
4353 if (EXIMfsync(journal_fd) < 0)
4354 log_write(0, LOG_MAIN|LOG_PANIC, "failed to fsync journal: %s",
4360 /* Handle general (not specific to one address) failures here. The value of ok
4361 is used to skip over this code on the falling through case. A timeout causes a
4362 deferral. Other errors may defer or fail according to the response code, and
4363 may set up a special errno value, e.g. after connection chopped, which is
4364 assumed if errno == 0 and there is no text in the buffer. If control reaches
4365 here during the setting up phase (i.e. before MAIL FROM) then always defer, as
4366 the problem is not related to this specific message. */
4371 uschar * set_message;
4377 /* Clear send_quit flag if needed. Do not set. */
4378 sx->send_quit &= check_response(host, &save_errno, addrlist->more_errno,
4379 sx->buffer, &code, &message, &pass_message);
4387 message = string_sprintf("smtp send to %s [%s] failed: %s",
4388 host->name, host->address, message ? message : US strerror(save_errno));
4389 sx->send_quit = FALSE;
4397 sx->ok = FALSE; /* For when reached by GOTO */
4398 set_message = message;
4400 /* We want to handle timeouts after MAIL or "." and loss of connection after
4401 "." specially. They can indicate a problem with the sender address or with
4402 the contents of the message rather than a real error on the connection. These
4403 cases are treated in the same way as a 4xx response. This next bit of code
4404 does the classification. */
4411 message_error = TRUE;
4415 message_error = Ustrncmp(smtp_command,"MAIL",4) == 0 ||
4416 Ustrncmp(smtp_command,"end ",4) == 0;
4419 case ERRNO_SMTPCLOSED:
4420 message_error = Ustrncmp(smtp_command,"end ",4) == 0;
4423 #ifndef DISABLE_DKIM
4425 /* DKIM signing failure: avoid thinking we pipelined quit,
4426 just abandon the message and close the socket. */
4428 message_error = FALSE;
4429 # ifndef DISABLE_TLS
4430 if (sx->cctx.tls_ctx)
4432 tls_close(sx->cctx.tls_ctx, TLS_SHUTDOWN_WAIT);
4433 sx->cctx.tls_ctx = NULL;
4439 message_error = FALSE;
4443 /* Handle the cases that are treated as message errors. These are:
4445 (a) negative response or timeout after MAIL
4446 (b) negative response after DATA
4447 (c) negative response or timeout or dropped connection after "."
4448 (d) utf8 support required and not offered
4450 It won't be a negative response or timeout after RCPT, as that is dealt
4451 with separately above. The action in all cases is to set an appropriate
4452 error code for all the addresses, but to leave yield set to OK because the
4453 host itself has not failed. Of course, it might in practice have failed
4454 when we've had a timeout, but if so, we'll discover that at the next
4455 delivery attempt. For a temporary error, set the message_defer flag, and
4456 write to the logs for information if this is not the last host. The error
4457 for the last host will be logged as part of the address's log line. */
4461 if (mua_wrapper) code = '5'; /* Force hard failure in wrapper mode */
4463 /* If there's an errno, the message contains just the identity of
4468 else /* Anything other than 5 is treated as temporary */
4472 message = US string_sprintf("%s: %s", message, strerror(save_errno));
4474 write_logs(host, message, sx->first_addr ? sx->first_addr->basic_errno : 0);
4476 *message_defer = TRUE;
4479 DEBUG(D_transport) if (sx->cctx.sock >= 0)
4482 if (ioctl(sx->cctx.sock, TIOCOUTQ, &n) == 0)
4483 debug_printf("%d bytes remain in socket output buffer\n", n);
4487 /* Otherwise, we have an I/O error or a timeout other than after MAIL or
4488 ".", or some other transportation error. We defer all addresses and yield
4489 DEFER, except for the case of failed add_headers expansion, or a transport
4490 filter failure, when the yield should be ERROR, to stop it trying other
4495 #ifndef DISABLE_PIPE_CONNECT
4496 /* If we were early-pipelinng and the actual EHLO response did not match
4497 the cached value we assumed, we could have detected it and passed a
4498 custom errno through to here. It would be nice to RSET and retry right
4499 away, but to reliably do that we eould need an extra synch point before
4500 we committed to data and that would discard half the gained roundrips.
4501 Or we could summarily drop the TCP connection. but that is also ugly.
4502 Instead, we ignore the possibility (having freshened the cache) and rely
4503 on the server telling us with a nonmessage error if we have tried to
4504 do something it no longer supports. */
4507 yield = (save_errno == ERRNO_CHHEADER_FAIL ||
4508 save_errno == ERRNO_FILTER_FAIL) ? ERROR : DEFER;
4512 set_errno(addrlist, save_errno, set_message, set_rc, pass_message, host,
4513 #ifdef EXPERIMENTAL_DSN_INFO
4514 sx->smtp_greeting, sx->helo_response,
4516 &sx->delivery_start);
4519 /* If all has gone well, send_quit will be set TRUE, implying we can end the
4520 SMTP session tidily. However, if there were too many addresses to send in one
4521 message (indicated by first_addr being non-NULL) we want to carry on with the
4522 rest of them. Also, it is desirable to send more than one message down the SMTP
4523 connection if there are several waiting, provided we haven't already sent so
4524 many as to hit the configured limit. The function transport_check_waiting looks
4525 for a waiting message and returns its id. Then transport_pass_socket tries to
4526 set up a continued delivery by passing the socket on to another process. The
4527 variable send_rset is FALSE if a message has just been successfully transferred.
4529 If we are already sending down a continued channel, there may be further
4530 addresses not yet delivered that are aimed at the same host, but which have not
4531 been passed in this run of the transport. In this case, continue_more will be
4532 true, and all we should do is send RSET if necessary, and return, leaving the
4535 However, if no address was disposed of, i.e. all addresses got 4xx errors, we
4536 do not want to continue with other messages down the same channel, because that
4537 can lead to looping between two or more messages, all with the same,
4538 temporarily failing address(es). [The retry information isn't updated yet, so
4539 new processes keep on trying.] We probably also don't want to try more of this
4540 message's addresses either.
4542 If we have started a TLS session, we have to end it before passing the
4543 connection to a new process. However, not all servers can handle this (Exim
4544 can), so we do not pass such a connection on if the host matches
4545 hosts_nopass_tls. */
4548 debug_printf("ok=%d send_quit=%d send_rset=%d continue_more=%d "
4549 "yield=%d first_address is %sNULL\n", sx->ok, sx->send_quit,
4550 sx->send_rset, f.continue_more, yield, sx->first_addr ? "not " : "");
4552 if (sx->completed_addr && sx->ok && sx->send_quit)
4553 #ifdef EXPERIMENTAL_ESMTP_LIMITS
4554 if (mail_limit = continue_sequence >= sx->max_mail)
4557 debug_printf("reached limit %u for MAILs per conn\n", sx->max_mail);
4562 smtp_compare_t t_compare =
4563 {.tblock = tblock, .current_sender_address = sender_address};
4565 if ( sx->first_addr /* more addrs for this message */
4566 || f.continue_more /* more addrs for continued-host */
4567 || tcw_done && tcw /* more messages for host */
4570 ( tls_out.active.sock < 0 && !continue_proxy_cipher
4571 || verify_check_given_host(CUSS &ob->hosts_nopass_tls, host) != OK
4575 transport_check_waiting(tblock->name, host->name,
4576 sx->max_mail, new_message_id,
4577 (oicf)smtp_are_same_identities, (void*)&t_compare)
4584 if (! (sx->ok = smtp_write_command(sx, SCMD_FLUSH, "RSET\r\n") >= 0))
4586 msg = US string_sprintf("smtp send to %s [%s] failed: %s", host->name,
4587 host->address, strerror(errno));
4588 sx->send_quit = FALSE;
4590 else if (! (sx->ok = smtp_read_response(sx, sx->buffer, sizeof(sx->buffer),
4591 '2', ob->command_timeout)))
4594 sx->send_quit = check_response(host, &errno, 0, sx->buffer, &code, &msg,
4598 DEBUG(D_transport) debug_printf("H=%s [%s] %s\n",
4599 host->name, host->address, msg);
4603 /* Either RSET was not needed, or it succeeded */
4610 int socket_fd = sx->cctx.sock;
4612 if (sx->first_addr) /* More addresses still to be sent */
4613 { /* for this message */
4614 #ifdef EXPERIMENTAL_ESMTP_LIMITS
4615 /* Any that we marked as skipped, reset to do now */
4616 for (address_item * a = sx->first_addr; a; a = a->next)
4617 if (a->transport_return == SKIP)
4618 a->transport_return = PENDING_DEFER;
4620 continue_sequence++; /* for consistency */
4621 clearflag(sx->first_addr, af_new_conn);
4622 setflag(sx->first_addr, af_cont_conn); /* Causes * in logging */
4623 pipelining_active = sx->pipelining_used; /* was cleared at DATA */
4627 /* Unless caller said it already has more messages listed for this host,
4628 pass the connection on to a new Exim process (below, the call to
4629 transport_pass_socket). If the caller has more ready, just return with
4630 the connection still open. */
4633 if (tls_out.active.sock >= 0)
4634 if ( f.continue_more
4635 || verify_check_given_host(CUSS &ob->hosts_noproxy_tls, host) == OK)
4637 /* Before passing the socket on, or returning to caller with it still
4638 open, we must shut down TLS. Not all MTAs allow for the continuation
4639 of the SMTP session when TLS is shut down. We test for this by sending
4640 a new EHLO. If we don't get a good response, we don't attempt to pass
4643 tls_close(sx->cctx.tls_ctx, TLS_SHUTDOWN_WAIT);
4644 sx->send_tlsclose = FALSE;
4645 sx->cctx.tls_ctx = NULL;
4646 tls_out.active.sock = -1;
4647 smtp_peer_options = smtp_peer_options_wrap;
4649 && smtp_write_command(sx, SCMD_FLUSH, "EHLO %s\r\n", sx->helo_data)
4651 && smtp_read_response(sx, sx->buffer, sizeof(sx->buffer),
4652 '2', ob->command_timeout);
4654 if (sx->ok && f.continue_more)
4655 goto TIDYUP; /* More addresses for another run */
4659 /* Set up a pipe for proxying TLS for the new transport process */
4661 smtp_peer_options |= OPTION_TLS;
4662 if ((sx->ok = socketpair(AF_UNIX, SOCK_STREAM, 0, pfd) == 0))
4665 set_errno(sx->first_addr, errno, US"internal allocation problem",
4667 # ifdef EXPERIMENTAL_DSN_INFO
4668 sx->smtp_greeting, sx->helo_response,
4670 &sx->delivery_start);
4674 if (f.continue_more)
4675 goto TIDYUP; /* More addresses for another run */
4677 /* If the socket is successfully passed, we mustn't send QUIT (or
4678 indeed anything!) from here. */
4680 /*XXX DSN_INFO: assume likely to do new HELO; but for greet we'll want to
4681 propagate it from the initial
4683 if (sx->ok && transport_pass_socket(tblock->name, host->name,
4684 host->address, new_message_id, socket_fd
4685 #ifdef EXPERIMENTAL_ESMTP_LIMITS
4686 , sx->peer_limit_mail, sx->peer_limit_rcpt, sx->peer_limit_rcptdom
4690 sx->send_quit = FALSE;
4692 /* We have passed the client socket to a fresh transport process.
4693 If TLS is still active, we need to proxy it for the transport we
4694 just passed the baton to. Fork a child to to do it, and return to
4695 get logging done asap. Which way to place the work makes assumptions
4696 about post-fork prioritisation which may not hold on all platforms. */
4698 if (tls_out.active.sock >= 0)
4700 int pid = exim_fork(US"tls-proxy-interproc");
4701 if (pid == 0) /* child; fork again to disconnect totally */
4703 /* does not return */
4704 smtp_proxy_tls(sx->cctx.tls_ctx, sx->buffer, sizeof(sx->buffer), pfd,
4705 ob->command_timeout);
4708 if (pid > 0) /* parent */
4711 /* tidy the inter-proc to disconn the proxy proc */
4712 waitpid(pid, NULL, 0);
4713 tls_close(sx->cctx.tls_ctx, TLS_NO_SHUTDOWN);
4714 sx->cctx.tls_ctx = NULL;
4715 (void)close(sx->cctx.sock);
4717 continue_transport = NULL;
4718 continue_hostname = NULL;
4721 log_write(0, LOG_PANIC_DIE, "fork failed");
4727 /* If RSET failed and there are addresses left, they get deferred. */
4729 set_errno(sx->first_addr, errno, msg, DEFER, FALSE, host,
4730 #ifdef EXPERIMENTAL_DSN_INFO
4731 sx->smtp_greeting, sx->helo_response,
4733 &sx->delivery_start);
4737 /* End off tidily with QUIT unless the connection has died or the socket has
4738 been passed to another process. */
4742 { /* Use _MORE to get QUIT in FIN segment */
4743 (void)smtp_write_command(sx, SCMD_MORE, "QUIT\r\n");
4745 if (sx->cctx.tls_ctx)
4747 # ifdef EXIM_TCP_CORK /* Use _CORK to get TLS Close Notify in FIN segment */
4748 (void) setsockopt(sx->cctx.sock, IPPROTO_TCP, EXIM_TCP_CORK, US &on, sizeof(on));
4750 tls_shutdown_wr(sx->cctx.tls_ctx);
4751 sx->send_tlsclose = FALSE;
4758 /* Close the socket, and return the appropriate value, first setting
4759 works because the NULL setting is passed back to the calling process, and
4760 remote_max_parallel is forced to 1 when delivering over an existing connection,
4762 If all went well and continue_more is set, we shouldn't actually get here if
4763 there are further addresses, as the return above will be taken. However,
4764 writing RSET might have failed, or there may be other addresses whose hosts are
4765 specified in the transports, and therefore not visible at top level, in which
4766 case continue_more won't get set. */
4770 /* This flushes data queued in the socket, being the QUIT and any TLS Close,
4771 sending them along with the client FIN flag. Us (we hope) sending FIN first
4772 means we (client) take the TIME_WAIT state, so the server (which likely has a
4773 higher connection rate) does not have to. */
4775 HDEBUG(D_transport|D_acl|D_v) debug_printf_indent(" SMTP(shutdown)>>\n");
4776 shutdown(sx->cctx.sock, SHUT_WR);
4779 if (sx->send_quit || tcw_done && !tcw)
4781 /* Wait for (we hope) ack of our QUIT, and a server FIN. Discard any data
4782 received, then discard the socket. Any packet received after then, or receive
4783 data still in the socket, will get a RST - hence the pause/drain. */
4785 /* Reap the response to QUIT, timing out after one second */
4786 (void) smtp_read_response(sx, sx->buffer, sizeof(sx->buffer), '2', 1);
4788 if (sx->cctx.tls_ctx)
4792 /* Reap the TLS Close Notify from the server, timing out after one second */
4793 sigalrm_seen = FALSE;
4796 n = tls_read(sx->cctx.tls_ctx, sx->inbuffer, sizeof(sx->inbuffer));
4797 while (!sigalrm_seen && n > 0);
4800 # ifdef EXIM_TCP_CORK
4801 (void) setsockopt(sx->cctx.sock, IPPROTO_TCP, EXIM_TCP_CORK, US &on, sizeof(on));
4803 tls_close(sx->cctx.tls_ctx, TLS_SHUTDOWN_WAIT);
4804 sx->cctx.tls_ctx = NULL;
4808 /* Drain any trailing data from the socket before close, to avoid sending a RST */
4810 if ( poll_one_fd(sx->cctx.sock, POLLIN, 20) != 0 /* 20ms */
4811 && fcntl(sx->cctx.sock, F_SETFL, O_NONBLOCK) == 0)
4812 for (int i = 16, n; /* drain socket */
4813 (n = read(sx->cctx.sock, sx->inbuffer, sizeof(sx->inbuffer))) > 0 && i > 0;
4814 i--) HDEBUG(D_transport|D_acl|D_v)
4817 debug_printf_indent(" SMTP(drain %d bytes)<< %.*s\n", n, m, sx->inbuffer);
4818 for (m = 0; m < n; m++)
4819 debug_printf("0x%02x\n", sx->inbuffer[m]);
4822 HDEBUG(D_transport|D_acl|D_v) debug_printf_indent(" SMTP(close)>>\n");
4823 (void)close(sx->cctx.sock);
4825 continue_transport = NULL;
4826 continue_hostname = NULL;
4828 #ifndef DISABLE_EVENT
4829 (void) event_raise(tblock->event_action, US"tcp:close", NULL, NULL);
4835 sx->first_addr = NULL;
4836 for (address_item * a = sx->addrlist->next; a; a = a->next)
4837 if (a->transport_return == DANE)
4839 a->transport_return = PENDING_DEFER;
4840 if (!sx->first_addr)
4842 /* Remember the new start-point in the addrlist, for smtp_setup_conn()
4843 to get the domain string for SNI */
4846 clearflag(a, af_cont_conn);
4847 setflag(a, af_new_conn); /* clear * from logging */
4848 DEBUG(D_transport) debug_printf("DANE: go-around for %s\n", a->domain);
4851 continue_sequence = 1; /* for consistency */
4856 #ifdef EXPERIMENTAL_ESMTP_LIMITS
4857 if (mail_limit && sx->first_addr)
4859 /* Reset the sequence count since we closed the connection. This is flagged
4860 on the pipe back to the delivery process so that a non-continued-conn delivery
4863 continue_sequence = 1; /* for consistency */
4864 clearflag(sx->first_addr, af_cont_conn);
4865 setflag(sx->first_addr, af_new_conn); /* clear * from logging */
4874 if (dane_held) for (address_item * a = sx->addrlist->next; a; a = a->next)
4875 if (a->transport_return == DANE)
4876 a->transport_return = PENDING_DEFER;
4884 /*************************************************
4885 * Closedown entry point *
4886 *************************************************/
4888 /* This function is called when exim is passed an open smtp channel
4889 from another incarnation, but the message which it has been asked
4890 to deliver no longer exists. The channel is on stdin.
4892 We might do fancy things like looking for another message to send down
4893 the channel, but if the one we sought has gone, it has probably been
4894 delivered by some other process that itself will seek further messages,
4895 so just close down our connection.
4897 Argument: pointer to the transport instance block
4902 smtp_transport_closedown(transport_instance *tblock)
4904 smtp_transport_options_block * ob = SOB tblock->options_block;
4905 client_conn_ctx cctx;
4908 uschar inbuffer[4096];
4909 uschar outbuffer[16];
4911 /*XXX really we need an active-smtp-client ctx, rather than assuming stdout */
4912 cctx.sock = fileno(stdin);
4913 cctx.tls_ctx = cctx.sock == tls_out.active.sock ? tls_out.active.tls_ctx : NULL;
4915 sx.inblock.cctx = &cctx;
4916 sx.inblock.buffer = inbuffer;
4917 sx.inblock.buffersize = sizeof(inbuffer);
4918 sx.inblock.ptr = inbuffer;
4919 sx.inblock.ptrend = inbuffer;
4921 sx.outblock.cctx = &cctx;
4922 sx.outblock.buffersize = sizeof(outbuffer);
4923 sx.outblock.buffer = outbuffer;
4924 sx.outblock.ptr = outbuffer;
4925 sx.outblock.cmd_count = 0;
4926 sx.outblock.authenticating = FALSE;
4928 (void)smtp_write_command(&sx, SCMD_FLUSH, "QUIT\r\n");
4929 (void)smtp_read_response(&sx, buffer, sizeof(buffer), '2', ob->command_timeout);
4930 (void)close(cctx.sock);
4935 /*************************************************
4936 * Prepare addresses for delivery *
4937 *************************************************/
4939 /* This function is called to flush out error settings from previous delivery
4940 attempts to other hosts. It also records whether we got here via an MX record
4941 or not in the more_errno field of the address. We are interested only in
4942 addresses that are still marked DEFER - others may have got delivered to a
4943 previously considered IP address. Set their status to PENDING_DEFER to indicate
4944 which ones are relevant this time.
4947 addrlist the list of addresses
4948 host the host we are delivering to
4950 Returns: the first address for this delivery
4953 static address_item *
4954 prepare_addresses(address_item *addrlist, host_item *host)
4956 address_item *first_addr = NULL;
4957 for (address_item * addr = addrlist; addr; addr = addr->next)
4958 if (addr->transport_return == DEFER)
4960 if (!first_addr) first_addr = addr;
4961 addr->transport_return = PENDING_DEFER;
4962 addr->basic_errno = 0;
4963 addr->more_errno = (host->mx >= 0)? 'M' : 'A';
4964 addr->message = NULL;
4966 addr->cipher = NULL;
4967 addr->ourcert = NULL;
4968 addr->peercert = NULL;
4969 addr->peerdn = NULL;
4970 addr->ocsp = OCSP_NOT_REQ;
4971 addr->tlsver = NULL;
4973 #ifdef EXPERIMENTAL_DSN_INFO
4974 addr->smtp_greeting = NULL;
4975 addr->helo_response = NULL;
4983 /*************************************************
4984 * Main entry point *
4985 *************************************************/
4987 /* See local README for interface details. As this is a remote transport, it is
4988 given a chain of addresses to be delivered in one connection, if possible. It
4989 always returns TRUE, indicating that each address has its own independent
4990 status set, except if there is a setting up problem, in which case it returns
4994 smtp_transport_entry(
4995 transport_instance *tblock, /* data for this instantiation */
4996 address_item *addrlist) /* addresses we are working on */
4999 int hosts_defer = 0;
5001 int hosts_looked_up = 0;
5002 int hosts_retry = 0;
5003 int hosts_serial = 0;
5004 int hosts_total = 0;
5005 int total_hosts_tried = 0;
5006 BOOL expired = TRUE;
5007 uschar *expanded_hosts = NULL;
5009 uschar *tid = string_sprintf("%s transport", tblock->name);
5010 smtp_transport_options_block *ob = SOB tblock->options_block;
5011 host_item *hostlist = addrlist->host_list;
5012 host_item *host = NULL;
5016 debug_printf("%s transport entered\n", tblock->name);
5017 for (address_item * addr = addrlist; addr; addr = addr->next)
5018 debug_printf(" %s\n", addr->address);
5021 debug_printf("hostlist:\n");
5022 for (host_item * host = hostlist; host; host = host->next)
5023 debug_printf(" '%s' IP %s port %d\n", host->name, host->address, host->port);
5025 if (continue_hostname)
5026 debug_printf("already connected to %s [%s] (on fd %d)\n",
5027 continue_hostname, continue_host_address,
5028 cutthrough.cctx.sock >= 0 ? cutthrough.cctx.sock : 0);
5031 /* Check the restrictions on line length */
5033 if (max_received_linelength > ob->message_linelength_limit)
5036 gettimeofday(&now, NULL);
5038 for (address_item * addr = addrlist; addr; addr = addr->next)
5039 if (addr->transport_return == DEFER)
5040 addr->transport_return = PENDING_DEFER;
5042 set_errno_nohost(addrlist, ERRNO_SMTPFORMAT,
5043 US"message has lines too long for transport", FAIL, TRUE, &now);
5047 /* Set the flag requesting that these hosts be added to the waiting
5048 database if the delivery fails temporarily or if we are running with
5049 queue_smtp or a 2-stage queue run. This gets unset for certain
5050 kinds of error, typically those that are specific to the message. */
5052 update_waiting = TRUE;
5054 /* If a host list is not defined for the addresses - they must all have the
5055 same one in order to be passed to a single transport - or if the transport has
5056 a host list with hosts_override set, use the host list supplied with the
5057 transport. It is an error for this not to exist. */
5059 if (!hostlist || (ob->hosts_override && ob->hosts))
5063 addrlist->message = string_sprintf("%s transport called with no hosts set",
5065 addrlist->transport_return = PANIC;
5066 return FALSE; /* Only top address has status */
5069 DEBUG(D_transport) debug_printf("using the transport's hosts: %s\n",
5072 /* If the transport's host list contains no '$' characters, and we are not
5073 randomizing, it is fixed and therefore a chain of hosts can be built once
5074 and for all, and remembered for subsequent use by other calls to this
5075 transport. If, on the other hand, the host list does contain '$', or we are
5076 randomizing its order, we have to rebuild it each time. In the fixed case,
5077 as the hosts string will never be used again, it doesn't matter that we
5078 replace all the : characters with zeros. */
5082 uschar *s = ob->hosts;
5084 if (Ustrchr(s, '$'))
5086 if (!(expanded_hosts = expand_string(s)))
5088 addrlist->message = string_sprintf("failed to expand list of hosts "
5089 "\"%s\" in %s transport: %s", s, tblock->name, expand_string_message);
5090 addrlist->transport_return = f.search_find_defer ? DEFER : PANIC;
5091 return FALSE; /* Only top address has status */
5093 DEBUG(D_transport) debug_printf("expanded list of hosts \"%s\" to "
5094 "\"%s\"\n", s, expanded_hosts);
5098 if (ob->hosts_randomize) s = expanded_hosts = string_copy(s);
5102 log_write(0, LOG_MAIN|LOG_PANIC,
5103 "attempt to use tainted host list '%s' from '%s' in transport %s",
5104 s, ob->hosts, tblock->name);
5105 /* Avoid leaking info to an attacker */
5106 addrlist->message = US"internal configuration error";
5107 addrlist->transport_return = PANIC;
5111 host_build_hostlist(&hostlist, s, ob->hosts_randomize);
5113 /* Check that the expansion yielded something useful. */
5117 string_sprintf("%s transport has empty hosts setting", tblock->name);
5118 addrlist->transport_return = PANIC;
5119 return FALSE; /* Only top address has status */
5122 /* If there was no expansion of hosts, save the host list for
5125 if (!expanded_hosts) ob->hostlist = hostlist;
5128 /* This is not the first time this transport has been run in this delivery;
5129 the host list was built previously. */
5132 hostlist = ob->hostlist;
5135 /* The host list was supplied with the address. If hosts_randomize is set, we
5136 must sort it into a random order if it did not come from MX records and has not
5137 already been randomized (but don't bother if continuing down an existing
5140 else if (ob->hosts_randomize && hostlist->mx == MX_NONE && !continue_hostname)
5142 host_item *newlist = NULL;
5145 host_item *h = hostlist;
5146 hostlist = hostlist->next;
5148 h->sort_key = random_number(100);
5155 else if (h->sort_key < newlist->sort_key)
5162 host_item *hh = newlist;
5165 if (h->sort_key < hh->next->sort_key) break;
5173 hostlist = addrlist->host_list = newlist;
5176 /* Sort out the default port. */
5178 if (!smtp_get_port(ob->port, addrlist, &defport, tid)) return FALSE;
5180 /* For each host-plus-IP-address on the list:
5182 . If this is a continued delivery and the host isn't the one with the
5183 current connection, skip.
5185 . If the status is unusable (i.e. previously failed or retry checked), skip.
5187 . If no IP address set, get the address, either by turning the name into
5188 an address, calling gethostbyname if gethostbyname is on, or by calling
5189 the DNS. The DNS may yield multiple addresses, in which case insert the
5190 extra ones into the list.
5192 . Get the retry data if not previously obtained for this address and set the
5193 field which remembers the state of this address. Skip if the retry time is
5194 not reached. If not, remember whether retry data was found. The retry string
5195 contains both the name and the IP address.
5197 . Scan the list of addresses and mark those whose status is DEFER as
5198 PENDING_DEFER. These are the only ones that will be processed in this cycle
5201 . Make a delivery attempt - addresses marked PENDING_DEFER will be tried.
5202 Some addresses may be successfully delivered, others may fail, and yet
5203 others may get temporary errors and so get marked DEFER.
5205 . The return from the delivery attempt is OK if a connection was made and a
5206 valid SMTP dialogue was completed. Otherwise it is DEFER.
5208 . If OK, add a "remove" retry item for this host/IPaddress, if any.
5210 . If fail to connect, or other defer state, add a retry item.
5212 . If there are any addresses whose status is still DEFER, carry on to the
5213 next host/IPaddress, unless we have tried the number of hosts given
5214 by hosts_max_try or hosts_max_try_hardlimit; otherwise return. Note that
5215 there is some fancy logic for hosts_max_try that means its limit can be
5216 overstepped in some circumstances.
5218 If we get to the end of the list, all hosts have deferred at least one address,
5219 or not reached their retry times. If delay_after_cutoff is unset, it requests a
5220 delivery attempt to those hosts whose last try was before the arrival time of
5221 the current message. To cope with this, we have to go round the loop a second
5222 time. After that, set the status and error data for any addresses that haven't
5223 had it set already. */
5225 for (int cutoff_retry = 0;
5226 expired && cutoff_retry < (ob->delay_after_cutoff ? 1 : 2);
5229 host_item *nexthost = NULL;
5230 int unexpired_hosts_tried = 0;
5231 BOOL continue_host_tried = FALSE;
5233 retry_non_continued:
5234 for (host = hostlist;
5236 && unexpired_hosts_tried < ob->hosts_max_try
5237 && total_hosts_tried < ob->hosts_max_try_hardlimit;
5242 BOOL host_is_expired = FALSE;
5243 BOOL message_defer = FALSE;
5244 BOOL some_deferred = FALSE;
5245 address_item *first_addr = NULL;
5246 uschar *interface = NULL;
5247 uschar *retry_host_key = NULL;
5248 uschar *retry_message_key = NULL;
5249 uschar *serialize_key = NULL;
5251 /* Default next host is next host. :-) But this can vary if the
5252 hosts_max_try limit is hit (see below). It may also be reset if a host
5253 address is looked up here (in case the host was multihomed). */
5255 nexthost = host->next;
5257 /* If the address hasn't yet been obtained from the host name, look it up
5258 now, unless the host is already marked as unusable. If it is marked as
5259 unusable, it means that the router was unable to find its IP address (in
5260 the DNS or wherever) OR we are in the 2nd time round the cutoff loop, and
5261 the lookup failed last time. We don't get this far if *all* MX records
5262 point to non-existent hosts; that is treated as a hard error.
5264 We can just skip this host entirely. When the hosts came from the router,
5265 the address will timeout based on the other host(s); when the address is
5266 looked up below, there is an explicit retry record added.
5268 Note that we mustn't skip unusable hosts if the address is not unset; they
5269 may be needed as expired hosts on the 2nd time round the cutoff loop. */
5273 int new_port, flags;
5275 if (host->status >= hstatus_unusable)
5277 DEBUG(D_transport) debug_printf("%s has no address and is unusable - skipping\n",
5282 DEBUG(D_transport) debug_printf("getting address for %s\n", host->name);
5284 /* The host name is permitted to have an attached port. Find it, and
5285 strip it from the name. Just remember it for now. */
5287 new_port = host_item_get_port(host);
5289 /* Count hosts looked up */
5293 /* Find by name if so configured, or if it's an IP address. We don't
5294 just copy the IP address, because we need the test-for-local to happen. */
5296 flags = HOST_FIND_BY_A | HOST_FIND_BY_AAAA;
5297 if (ob->dns_qualify_single) flags |= HOST_FIND_QUALIFY_SINGLE;
5298 if (ob->dns_search_parents) flags |= HOST_FIND_SEARCH_PARENTS;
5300 if (ob->gethostbyname || string_is_ip_address(host->name, NULL) != 0)
5301 rc = host_find_byname(host, NULL, flags, NULL, TRUE);
5303 rc = host_find_bydns(host, NULL, flags, NULL, NULL, NULL,
5304 &ob->dnssec, /* domains for request/require */
5307 /* Update the host (and any additional blocks, resulting from
5308 multihoming) with a host-specific port, if any. */
5310 for (host_item * hh = host; hh != nexthost; hh = hh->next) hh->port = new_port;
5312 /* Failure to find the host at this time (usually DNS temporary failure)
5313 is really a kind of routing failure rather than a transport failure.
5314 Therefore we add a retry item of the routing kind, not to stop us trying
5315 to look this name up here again, but to ensure the address gets timed
5316 out if the failures go on long enough. A complete failure at this point
5317 commonly points to a configuration error, but the best action is still
5318 to carry on for the next host. */
5320 if (rc == HOST_FIND_AGAIN || rc == HOST_FIND_SECURITY || rc == HOST_FIND_FAILED)
5322 retry_add_item(addrlist, string_sprintf("R:%s", host->name), 0);
5324 if (rc == HOST_FIND_AGAIN) hosts_defer++; else hosts_fail++;
5325 DEBUG(D_transport) debug_printf("rc = %s for %s\n", (rc == HOST_FIND_AGAIN)?
5326 "HOST_FIND_AGAIN" : "HOST_FIND_FAILED", host->name);
5327 host->status = hstatus_unusable;
5329 for (address_item * addr = addrlist; addr; addr = addr->next)
5331 if (addr->transport_return != DEFER) continue;
5332 addr->basic_errno = ERRNO_UNKNOWNHOST;
5333 addr->message = string_sprintf(
5334 rc == HOST_FIND_SECURITY
5335 ? "lookup of IP address for %s was insecure"
5336 : "failed to lookup IP address for %s",
5342 /* If the host is actually the local host, we may have a problem, or
5343 there may be some cunning configuration going on. In the problem case,
5344 log things and give up. The default transport status is already DEFER. */
5346 if (rc == HOST_FOUND_LOCAL && !ob->allow_localhost)
5348 for (address_item * addr = addrlist; addr; addr = addr->next)
5350 addr->basic_errno = ERRNO_HOST_IS_LOCAL;
5351 addr->message = string_sprintf("%s transport found host %s to be "
5352 "local", tblock->name, host->name);
5356 } /* End of block for IP address lookup */
5358 /* If this is a continued delivery, we are interested only in the host
5359 which matches the name of the existing open channel. The check is put
5360 here after the local host lookup, in case the name gets expanded as a
5361 result of the lookup. Set expired FALSE, to save the outer loop executing
5364 if (continue_hostname)
5365 if ( Ustrcmp(continue_hostname, host->name) != 0
5366 || Ustrcmp(continue_host_address, host->address) != 0
5370 continue; /* With next host */
5373 continue_host_tried = TRUE;
5375 /* Reset the default next host in case a multihomed host whose addresses
5376 are not looked up till just above added to the host list. */
5378 nexthost = host->next;
5380 /* If queue_smtp is set (-odqs or the first part of a 2-stage run), or the
5381 domain is in queue_smtp_domains, we don't actually want to attempt any
5382 deliveries. When doing a queue run, queue_smtp_domains is always unset. If
5383 there is a lookup defer in queue_smtp_domains, proceed as if the domain
5384 were not in it. We don't want to hold up all SMTP deliveries! Except when
5385 doing a two-stage queue run, don't do this if forcing. */
5387 if ( (!f.deliver_force || f.queue_2stage)
5389 || match_isinlist(addrlist->domain,
5390 CUSS &queue_smtp_domains, 0,
5391 &domainlist_anchor, NULL, MCL_DOMAIN, TRUE, NULL) == OK)
5394 DEBUG(D_transport) debug_printf("first-pass routing only\n");
5396 for (address_item * addr = addrlist; addr; addr = addr->next)
5397 if (addr->transport_return == DEFER)
5398 addr->message = US"first-pass only routing due to -odqs, "
5399 "queue_smtp_domains or control=queue";
5400 continue; /* With next host */
5403 /* Count hosts being considered - purely for an intelligent comment
5404 if none are usable. */
5408 /* Set $host and $host address now in case they are needed for the
5409 interface expansion or the serialize_hosts check; they remain set if an
5410 actual delivery happens. */
5412 deliver_host = host->name;
5413 deliver_host_address = host->address;
5414 lookup_dnssec_authenticated = host->dnssec == DS_YES ? US"yes"
5415 : host->dnssec == DS_NO ? US"no"
5418 /* Set up a string for adding to the retry key if the port number is not
5419 the standard SMTP port. A host may have its own port setting that overrides
5422 pistring = string_sprintf(":%d", host->port == PORT_NONE
5423 ? defport : host->port);
5424 if (Ustrcmp(pistring, ":25") == 0) pistring = US"";
5426 /* Select IPv4 or IPv6, and choose an outgoing interface. If the interface
5427 string is set, even if constant (as different transports can have different
5428 constant settings), we must add it to the key that is used for retries,
5429 because connections to the same host from a different interface should be
5430 treated separately. */
5432 host_af = Ustrchr(host->address, ':') ? AF_INET6 : AF_INET;
5434 uschar * s = ob->interface;
5437 if (!smtp_get_interface(s, host_af, addrlist, &interface, tid))
5439 pistring = string_sprintf("%s/%s", pistring, interface);
5443 /* The first time round the outer loop, check the status of the host by
5444 inspecting the retry data. The second time round, we are interested only
5445 in expired hosts that haven't been tried since this message arrived. */
5447 if (cutoff_retry == 0)
5450 /* Ensure the status of the address is set by checking retry data if
5451 necessary. There may be host-specific retry data (applicable to all
5452 messages) and also data for retries of a specific message at this host.
5453 If either of these retry records are actually read, the keys used are
5454 returned to save recomputing them later. */
5456 if (exp_bool(addrlist, US"transport", tblock->name, D_transport,
5457 US"retry_include_ip_address", ob->retry_include_ip_address,
5458 ob->expand_retry_include_ip_address, &incl_ip) != OK)
5459 continue; /* with next host */
5461 host_is_expired = retry_check_address(addrlist->domain, host, pistring,
5462 incl_ip, &retry_host_key, &retry_message_key);
5464 DEBUG(D_transport) debug_printf("%s [%s]%s retry-status = %s\n", host->name,
5465 host->address ? host->address : US"", pistring,
5466 host->status == hstatus_usable ? "usable"
5467 : host->status == hstatus_unusable ? "unusable"
5468 : host->status == hstatus_unusable_expired ? "unusable (expired)" : "?");
5470 /* Skip this address if not usable at this time, noting if it wasn't
5471 actually expired, both locally and in the address. */
5473 switch (host->status)
5475 case hstatus_unusable:
5477 setflag(addrlist, af_retry_skipped);
5480 case hstatus_unusable_expired:
5483 case hwhy_retry: hosts_retry++; break;
5484 case hwhy_failed: hosts_fail++; break;
5486 case hwhy_deferred: hosts_defer++; break;
5489 /* If there was a retry message key, implying that previously there
5490 was a message-specific defer, we don't want to update the list of
5491 messages waiting for these hosts. */
5493 if (retry_message_key) update_waiting = FALSE;
5494 continue; /* With the next host or IP address */
5498 /* Second time round the loop: if the address is set but expired, and
5499 the message is newer than the last try, let it through. */
5504 || host->status != hstatus_unusable_expired
5505 || host->last_try > received_time.tv_sec)
5507 DEBUG(D_transport) debug_printf("trying expired host %s [%s]%s\n",
5508 host->name, host->address, pistring);
5509 host_is_expired = TRUE;
5512 /* Setting "expired=FALSE" doesn't actually mean not all hosts are expired;
5513 it remains TRUE only if all hosts are expired and none are actually tried.
5518 /* If this host is listed as one to which access must be serialized,
5519 see if another Exim process has a connection to it, and if so, skip
5520 this host. If not, update the database to record our connection to it
5521 and remember this for later deletion. Do not do any of this if we are
5522 sending the message down a pre-existing connection. */
5524 if ( !continue_hostname
5525 && verify_check_given_host(CUSS &ob->serialize_hosts, host) == OK)
5527 serialize_key = string_sprintf("host-serialize-%s", host->name);
5528 if (!enq_start(serialize_key, 1))
5531 debug_printf("skipping host %s because another Exim process "
5532 "is connected to it\n", host->name);
5538 /* OK, we have an IP address that is not waiting for its retry time to
5539 arrive (it might be expired) OR (second time round the loop) we have an
5540 expired host that hasn't been tried since the message arrived. Have a go
5541 at delivering the message to it. First prepare the addresses by flushing
5542 out the result of previous attempts, and finding the first address that
5543 is still to be delivered. */
5545 first_addr = prepare_addresses(addrlist, host);
5547 DEBUG(D_transport) debug_printf("delivering %s to %s [%s] (%s%s)\n",
5548 message_id, host->name, host->address, addrlist->address,
5549 addrlist->next ? ", ..." : "");
5551 set_process_info("delivering %s to %s [%s]%s (%s%s)",
5552 message_id, host->name, host->address, pistring, addrlist->address,
5553 addrlist->next ? ", ..." : "");
5555 /* This is not for real; don't do the delivery. If there are
5556 any remaining hosts, list them. */
5561 gettimeofday(&now, NULL);
5562 set_errno_nohost(addrlist, 0, NULL, OK, FALSE, &now);
5563 for (address_item * addr = addrlist; addr; addr = addr->next)
5565 addr->host_used = host;
5566 addr->special_action = '*';
5567 addr->message = US"delivery bypassed by -N option";
5571 debug_printf("*** delivery by %s transport bypassed by -N option\n"
5572 "*** host and remaining hosts:\n", tblock->name);
5573 for (host_item * host2 = host; host2; host2 = host2->next)
5574 debug_printf(" %s [%s]\n", host2->name,
5575 host2->address ? host2->address : US"unset");
5580 /* This is for real. If the host is expired, we don't count it for
5581 hosts_max_retry. This ensures that all hosts must expire before an address
5582 is timed out, unless hosts_max_try_hardlimit (which protects against
5583 lunatic DNS configurations) is reached.
5585 If the host is not expired and we are about to hit the hosts_max_retry
5586 limit, check to see if there is a subsequent hosts with a different MX
5587 value. If so, make that the next host, and don't count this one. This is a
5588 heuristic to make sure that different MXs do get tried. With a normal kind
5589 of retry rule, they would get tried anyway when the earlier hosts were
5590 delayed, but if the domain has a "retry every time" type of rule - as is
5591 often used for the the very large ISPs, that won't happen. */
5596 /* Make a copy of the host if it is local to this invocation
5597 of the transport. */
5601 thost = store_get(sizeof(host_item), GET_UNTAINTED);
5603 thost->name = string_copy(host->name);
5604 thost->address = string_copy(host->address);
5609 if (!host_is_expired && ++unexpired_hosts_tried >= ob->hosts_max_try)
5612 debug_printf("hosts_max_try limit reached with this host\n");
5613 for (host_item * h = host; h; h = h->next) if (h->mx != host->mx)
5616 unexpired_hosts_tried--;
5617 DEBUG(D_transport) debug_printf("however, a higher MX host exists "
5618 "and will be tried\n");
5623 /* Attempt the delivery. */
5625 total_hosts_tried++;
5626 rc = smtp_deliver(addrlist, thost, host_af, defport, interface, tblock,
5627 &message_defer, FALSE);
5630 OK => connection made, each address contains its result;
5631 message_defer is set for message-specific defers (when all
5632 recipients are marked defer)
5633 DEFER => there was a non-message-specific delivery problem;
5634 ERROR => there was a problem setting up the arguments for a filter,
5635 or there was a problem with expanding added headers
5638 /* If the result is not OK, there was a non-message-specific problem.
5639 If the result is DEFER, we need to write to the logs saying what happened
5640 for this particular host, except in the case of authentication and TLS
5641 failures, where the log has already been written. If all hosts defer a
5642 general message is written at the end. */
5644 if (rc == DEFER && first_addr->basic_errno != ERRNO_AUTHFAIL
5645 && first_addr->basic_errno != ERRNO_TLSFAILURE)
5646 write_logs(host, first_addr->message, first_addr->basic_errno);
5648 #ifndef DISABLE_EVENT
5650 deferred_event_raise(first_addr, host, US"msg:host:defer");
5653 /* If STARTTLS was accepted, but there was a failure in setting up the
5654 TLS session (usually a certificate screwup), and the host is not in
5655 hosts_require_tls, and tls_tempfail_tryclear is true, try again, with
5656 TLS forcibly turned off. We have to start from scratch with a new SMTP
5657 connection. That's why the retry is done from here, not from within
5658 smtp_deliver(). [Rejections of STARTTLS itself don't screw up the
5659 session, so the in-clear transmission after those errors, if permitted,
5660 happens inside smtp_deliver().] */
5664 && first_addr->basic_errno == ERRNO_TLSFAILURE
5665 && ob->tls_tempfail_tryclear
5666 && verify_check_given_host(CUSS &ob->hosts_require_tls, host) != OK
5669 log_write(0, LOG_MAIN,
5670 "%s: delivering unencrypted to H=%s [%s] (not in hosts_require_tls)",
5671 first_addr->message, host->name, host->address);
5672 first_addr = prepare_addresses(addrlist, host);
5673 rc = smtp_deliver(addrlist, thost, host_af, defport, interface, tblock,
5674 &message_defer, TRUE);
5675 if (rc == DEFER && first_addr->basic_errno != ERRNO_AUTHFAIL)
5676 write_logs(host, first_addr->message, first_addr->basic_errno);
5677 # ifndef DISABLE_EVENT
5679 deferred_event_raise(first_addr, host, US"msg:host:defer");
5682 #endif /*DISABLE_TLS*/
5684 #ifndef DISABLE_EVENT
5685 /* If the last host gave a defer raise a per-message event */
5688 && unexpired_hosts_tried < ob->hosts_max_try
5689 && total_hosts_tried < ob->hosts_max_try_hardlimit
5691 && (message_defer || rc == DEFER)
5693 deferred_event_raise(first_addr, host, US"msg:defer");
5697 /* Delivery attempt finished */
5699 set_process_info("delivering %s: just tried %s [%s]%s for %s%s: result %s",
5700 message_id, host->name, host->address, pistring, addrlist->address,
5701 addrlist->next ? " (& others)" : "", rc_to_string(rc));
5703 /* Release serialization if set up */
5705 if (serialize_key) enq_end(serialize_key);
5707 /* If the result is DEFER, or if a host retry record is known to exist, we
5708 need to add an item to the retry chain for updating the retry database
5709 at the end of delivery. We only need to add the item to the top address,
5710 of course. Also, if DEFER, we mark the IP address unusable so as to skip it
5711 for any other delivery attempts using the same address. (It is copied into
5712 the unusable tree at the outer level, so even if different address blocks
5713 contain the same address, it still won't get tried again.) */
5715 if (rc == DEFER || retry_host_key)
5717 int delete_flag = rc != DEFER ? rf_delete : 0;
5718 if (!retry_host_key)
5721 if (exp_bool(addrlist, US"transport", tblock->name, D_transport,
5722 US"retry_include_ip_address", ob->retry_include_ip_address,
5723 ob->expand_retry_include_ip_address, &incl_ip) != OK)
5724 incl_ip = TRUE; /* error; use most-specific retry record */
5726 retry_host_key = incl_ip
5727 ? string_sprintf("T:%S:%s%s", host->name, host->address, pistring)
5728 : string_sprintf("T:%S%s", host->name, pistring);
5731 /* If a delivery of another message over an existing SMTP connection
5732 yields DEFER, we do NOT set up retry data for the host. This covers the
5733 case when there are delays in routing the addresses in the second message
5734 that are so long that the server times out. This is alleviated by not
5735 routing addresses that previously had routing defers when handling an
5736 existing connection, but even so, this case may occur (e.g. if a
5737 previously happily routed address starts giving routing defers). If the
5738 host is genuinely down, another non-continued message delivery will
5739 notice it soon enough. */
5741 if (delete_flag != 0 || !continue_hostname)
5742 retry_add_item(first_addr, retry_host_key, rf_host | delete_flag);
5744 /* We may have tried an expired host, if its retry time has come; ensure
5745 the status reflects the expiry for the benefit of any other addresses. */
5749 host->status = host_is_expired
5750 ? hstatus_unusable_expired : hstatus_unusable;
5751 host->why = hwhy_deferred;
5755 /* If message_defer is set (host was OK, but every recipient got deferred
5756 because of some message-specific problem), or if that had happened
5757 previously so that a message retry key exists, add an appropriate item
5758 to the retry chain. Note that if there was a message defer but now there is
5759 a host defer, the message defer record gets deleted. That seems perfectly
5760 reasonable. Also, stop the message from being remembered as waiting
5761 for specific hosts. */
5763 if (message_defer || retry_message_key)
5765 int delete_flag = message_defer ? 0 : rf_delete;
5766 if (!retry_message_key)
5769 if (exp_bool(addrlist, US"transport", tblock->name, D_transport,
5770 US"retry_include_ip_address", ob->retry_include_ip_address,
5771 ob->expand_retry_include_ip_address, &incl_ip) != OK)
5772 incl_ip = TRUE; /* error; use most-specific retry record */
5774 retry_message_key = incl_ip
5775 ? string_sprintf("T:%S:%s%s:%s", host->name, host->address, pistring,
5777 : string_sprintf("T:%S%s:%s", host->name, pistring, message_id);
5779 retry_add_item(addrlist, retry_message_key,
5780 rf_message | rf_host | delete_flag);
5781 update_waiting = FALSE;
5784 /* Any return other than DEFER (that is, OK or ERROR) means that the
5785 addresses have got their final statuses filled in for this host. In the OK
5786 case, see if any of them are deferred. */
5789 for (address_item * addr = addrlist; addr; addr = addr->next)
5790 if (addr->transport_return == DEFER)
5792 some_deferred = TRUE;
5796 /* If no addresses deferred or the result was ERROR, return. We do this for
5797 ERROR because a failing filter set-up or add_headers expansion is likely to
5798 fail for any host we try. */
5800 if (rc == ERROR || (rc == OK && !some_deferred))
5802 DEBUG(D_transport) debug_printf("Leaving %s transport\n", tblock->name);
5803 return TRUE; /* Each address has its status */
5806 /* If the result was DEFER or some individual addresses deferred, let
5807 the loop run to try other hosts with the deferred addresses, except for the
5808 case when we were trying to deliver down an existing channel and failed.
5809 Don't try any other hosts in this case. */
5811 if (continue_hostname) break;
5813 /* If the whole delivery, or some individual addresses, were deferred and
5814 there are more hosts that could be tried, do not count this host towards
5815 the hosts_max_try limit if the age of the message is greater than the
5816 maximum retry time for this host. This means we may try try all hosts,
5817 ignoring the limit, when messages have been around for some time. This is
5818 important because if we don't try all hosts, the address will never time
5819 out. NOTE: this does not apply to hosts_max_try_hardlimit. */
5821 if ((rc == DEFER || some_deferred) && nexthost)
5824 retry_config *retry = retry_find_config(host->name, NULL, 0, 0);
5826 if (retry && retry->rules)
5828 retry_rule *last_rule;
5829 for (last_rule = retry->rules;
5831 last_rule = last_rule->next);
5832 timedout = time(NULL) - received_time.tv_sec > last_rule->timeout;
5834 else timedout = TRUE; /* No rule => timed out */
5838 unexpired_hosts_tried--;
5839 DEBUG(D_transport) debug_printf("temporary delivery error(s) override "
5840 "hosts_max_try (message older than host's retry time)\n");
5846 if (unexpired_hosts_tried >= ob->hosts_max_try)
5847 debug_printf("reached transport hosts_max_try limit %d\n",
5849 if (total_hosts_tried >= ob->hosts_max_try_hardlimit)
5850 debug_printf("reached transport hosts_max_try_hardlimit limit %d\n",
5851 ob->hosts_max_try_hardlimit);
5854 testharness_pause_ms(500); /* let server debug out */
5855 } /* End of loop for trying multiple hosts. */
5857 /* If we failed to find a matching host in the list, for an already-open
5858 connection, just close it and start over with the list. This can happen
5859 for routing that changes from run to run, or big multi-IP sites with
5862 if (continue_hostname && !continue_host_tried)
5864 int fd = cutthrough.cctx.sock >= 0 ? cutthrough.cctx.sock : 0;
5866 DEBUG(D_transport) debug_printf("no hosts match already-open connection\n");
5868 /* A TLS conn could be open for a cutthrough, but not for a plain continued-
5870 /*XXX doublecheck that! */
5872 if (cutthrough.cctx.sock >= 0 && cutthrough.is_tls)
5874 (void) tls_write(cutthrough.cctx.tls_ctx, US"QUIT\r\n", 6, FALSE);
5875 tls_close(cutthrough.cctx.tls_ctx, TLS_SHUTDOWN_NOWAIT);
5876 cutthrough.cctx.tls_ctx = NULL;
5877 cutthrough.is_tls = FALSE;
5881 (void) write(fd, US"QUIT\r\n", 6);
5884 cutthrough.cctx.sock = -1;
5885 continue_hostname = NULL;
5886 goto retry_non_continued;
5889 /* This is the end of the loop that repeats iff expired is TRUE and
5890 ob->delay_after_cutoff is FALSE. The second time round we will
5891 try those hosts that haven't been tried since the message arrived. */
5895 debug_printf("all IP addresses skipped or deferred at least one address\n");
5896 if (expired && !ob->delay_after_cutoff && cutoff_retry == 0)
5897 debug_printf("retrying IP addresses not tried since message arrived\n");
5902 /* Get here if all IP addresses are skipped or defer at least one address. In
5903 MUA wrapper mode, this will happen only for connection or other non-message-
5904 specific failures. Force the delivery status for all addresses to FAIL. */
5908 for (address_item * addr = addrlist; addr; addr = addr->next)
5909 addr->transport_return = FAIL;
5913 /* In the normal, non-wrapper case, add a standard message to each deferred
5914 address if there hasn't been an error, that is, if it hasn't actually been
5915 tried this time. The variable "expired" will be FALSE if any deliveries were
5916 actually tried, or if there was at least one host that was not expired. That
5917 is, it is TRUE only if no deliveries were tried and all hosts were expired. If
5918 a delivery has been tried, an error code will be set, and the failing of the
5919 message is handled by the retry code later.
5921 If queue_smtp is set, or this transport was called to send a subsequent message
5922 down an existing TCP/IP connection, and something caused the host not to be
5923 found, we end up here, but can detect these cases and handle them specially. */
5925 for (address_item * addr = addrlist; addr; addr = addr->next)
5927 /* If host is not NULL, it means that we stopped processing the host list
5928 because of hosts_max_try or hosts_max_try_hardlimit. In the former case, this
5929 means we need to behave as if some hosts were skipped because their retry
5930 time had not come. Specifically, this prevents the address from timing out.
5931 However, if we have hit hosts_max_try_hardlimit, we want to behave as if all
5932 hosts were tried. */
5935 if (total_hosts_tried >= ob->hosts_max_try_hardlimit)
5938 debug_printf("hosts_max_try_hardlimit reached: behave as if all "
5939 "hosts were tried\n");
5944 debug_printf("hosts_max_try limit caused some hosts to be skipped\n");
5945 setflag(addr, af_retry_skipped);
5948 if (f.queue_smtp) /* no deliveries attempted */
5950 addr->transport_return = DEFER;
5951 addr->basic_errno = 0;
5952 addr->message = US"SMTP delivery explicitly queued";
5955 else if ( addr->transport_return == DEFER
5956 && (addr->basic_errno == ERRNO_UNKNOWNERROR || addr->basic_errno == 0)
5960 addr->basic_errno = ERRNO_HRETRY;
5961 if (continue_hostname)
5962 addr->message = US"no host found for existing SMTP connection";
5965 setflag(addr, af_pass_message); /* This is not a security risk */
5966 addr->message = string_sprintf(
5967 "all hosts%s have been failing for a long time %s",
5968 addr->domain ? string_sprintf(" for '%s'", addr->domain) : US"",
5969 ob->delay_after_cutoff
5970 ? US"(and retry time not reached)"
5971 : US"and were last tried after this message arrived");
5973 /* If we are already using fallback hosts, or there are no fallback hosts
5974 defined, convert the result to FAIL to cause a bounce. */
5976 if (addr->host_list == addr->fallback_hosts || !addr->fallback_hosts)
5977 addr->transport_return = FAIL;
5982 if (hosts_retry == hosts_total)
5983 s = "retry time not reached for any host%s";
5984 else if (hosts_fail == hosts_total)
5985 s = "all host address lookups%s failed permanently";
5986 else if (hosts_defer == hosts_total)
5987 s = "all host address lookups%s failed temporarily";
5988 else if (hosts_serial == hosts_total)
5989 s = "connection limit reached for all hosts%s";
5990 else if (hosts_fail+hosts_defer == hosts_total)
5991 s = "all host address lookups%s failed";
5993 s = "some host address lookups failed and retry time "
5994 "not reached for other hosts or connection limit reached%s";
5996 addr->message = string_sprintf(s,
5997 addr->domain ? string_sprintf(" for '%s'", addr->domain) : US"");
6002 /* Update the database which keeps information about which messages are waiting
6003 for which hosts to become available. For some message-specific errors, the
6004 update_waiting flag is turned off because we don't want follow-on deliveries in
6005 those cases. If this transport instance is explicitly limited to one message
6006 per connection then follow-on deliveries are not possible and there's no need
6007 to create/update the per-transport wait-<transport_name> database. */
6009 if (update_waiting && tblock->connection_max_messages != 1)
6010 transport_update_waiting(hostlist, tblock->name);
6014 DEBUG(D_transport) debug_printf("Leaving %s transport\n", tblock->name);
6016 return TRUE; /* Each address has its status */
6019 #endif /*!MACRO_PREDEF*/
6022 /* End of transport/smtp.c */