1 /*************************************************
2 * Exim - an Internet mail transport agent *
3 *************************************************/
5 /* Copyright (c) The Exim Maintainers 2020 - 2022 */
6 /* Copyright (c) University of Cambridge 1995 - 2018 */
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 #if !defined(DISABLE_TLS) && !defined(DISABLE_TLS_RESUME)
68 { "host_name_extract", opt_stringptr, LOFF(host_name_extract) },
70 { "hosts", opt_stringptr, LOFF(hosts) },
71 { "hosts_avoid_esmtp", opt_stringptr, LOFF(hosts_avoid_esmtp) },
72 { "hosts_avoid_pipelining", opt_stringptr, LOFF(hosts_avoid_pipelining) },
74 { "hosts_avoid_tls", opt_stringptr, LOFF(hosts_avoid_tls) },
76 { "hosts_max_try", opt_int, LOFF(hosts_max_try) },
77 { "hosts_max_try_hardlimit", opt_int, LOFF(hosts_max_try_hardlimit) },
79 { "hosts_nopass_tls", opt_stringptr, LOFF(hosts_nopass_tls) },
80 { "hosts_noproxy_tls", opt_stringptr, LOFF(hosts_noproxy_tls) },
82 { "hosts_override", opt_bool, LOFF(hosts_override) },
83 #ifndef DISABLE_PIPE_CONNECT
84 { "hosts_pipe_connect", opt_stringptr, LOFF(hosts_pipe_connect) },
86 { "hosts_randomize", opt_bool, LOFF(hosts_randomize) },
87 #if !defined(DISABLE_TLS) && !defined(DISABLE_OCSP)
88 { "hosts_request_ocsp", opt_stringptr, LOFF(hosts_request_ocsp) },
90 { "hosts_require_alpn", opt_stringptr, LOFF(hosts_require_alpn) },
91 { "hosts_require_auth", opt_stringptr, LOFF(hosts_require_auth) },
94 { "hosts_require_dane", opt_stringptr, LOFF(hosts_require_dane) },
97 { "hosts_require_ocsp", opt_stringptr, LOFF(hosts_require_ocsp) },
99 { "hosts_require_tls", opt_stringptr, LOFF(hosts_require_tls) },
101 { "hosts_try_auth", opt_stringptr, LOFF(hosts_try_auth) },
102 { "hosts_try_chunking", opt_stringptr, LOFF(hosts_try_chunking) },
104 { "hosts_try_dane", opt_stringptr, LOFF(hosts_try_dane) },
106 { "hosts_try_fastopen", opt_stringptr, LOFF(hosts_try_fastopen) },
108 { "hosts_try_prdr", opt_stringptr, LOFF(hosts_try_prdr) },
111 { "hosts_verify_avoid_tls", opt_stringptr, LOFF(hosts_verify_avoid_tls) },
113 { "interface", opt_stringptr, LOFF(interface) },
114 { "keepalive", opt_bool, LOFF(keepalive) },
115 { "lmtp_ignore_quota", opt_bool, LOFF(lmtp_ignore_quota) },
116 { "max_rcpt", opt_int | opt_public,
117 OPT_OFF(transport_instance, max_addresses) },
118 { "message_linelength_limit", opt_int, LOFF(message_linelength_limit) },
119 { "multi_domain", opt_expand_bool | opt_public,
120 OPT_OFF(transport_instance, multi_domain) },
121 { "port", opt_stringptr, LOFF(port) },
122 { "protocol", opt_stringptr, LOFF(protocol) },
123 { "retry_include_ip_address", opt_expand_bool, LOFF(retry_include_ip_address) },
124 { "serialize_hosts", opt_stringptr, LOFF(serialize_hosts) },
125 { "size_addition", opt_int, LOFF(size_addition) },
127 { "socks_proxy", opt_stringptr, LOFF(socks_proxy) },
130 { "tls_alpn", opt_stringptr, LOFF(tls_alpn) },
131 { "tls_certificate", opt_stringptr, LOFF(tls_certificate) },
132 { "tls_crl", opt_stringptr, LOFF(tls_crl) },
133 { "tls_dh_min_bits", opt_int, LOFF(tls_dh_min_bits) },
134 { "tls_privatekey", opt_stringptr, LOFF(tls_privatekey) },
135 { "tls_require_ciphers", opt_stringptr, LOFF(tls_require_ciphers) },
136 # ifndef DISABLE_TLS_RESUME
137 { "tls_resumption_hosts", opt_stringptr, LOFF(tls_resumption_hosts) },
139 { "tls_sni", opt_stringptr, LOFF(tls_sni) },
140 { "tls_tempfail_tryclear", opt_bool, LOFF(tls_tempfail_tryclear) },
141 { "tls_try_verify_hosts", opt_stringptr, LOFF(tls_try_verify_hosts) },
142 { "tls_verify_cert_hostnames", opt_stringptr, LOFF(tls_verify_cert_hostnames)},
143 { "tls_verify_certificates", opt_stringptr, LOFF(tls_verify_certificates) },
144 { "tls_verify_hosts", opt_stringptr, LOFF(tls_verify_hosts) },
147 { "utf8_downconvert", opt_stringptr, LOFF(utf8_downconvert) },
151 /* Size of the options list. An extern variable has to be used so that its
152 address can appear in the tables drtables.c. */
154 int smtp_transport_options_count = nelem(smtp_transport_options);
160 smtp_transport_options_block smtp_transport_option_defaults = {0};
161 void smtp_transport_init(transport_instance *tblock) {}
162 BOOL smtp_transport_entry(transport_instance *tblock, address_item *addr) {return FALSE;}
163 void smtp_transport_closedown(transport_instance *tblock) {}
165 #else /*!MACRO_PREDEF*/
168 /* Default private options block for the smtp transport. */
170 smtp_transport_options_block smtp_transport_option_defaults = {
171 /* All non-mentioned elements 0/NULL/FALSE */
172 .helo_data = US"$primary_hostname",
173 .protocol = US"smtp",
174 .hosts_try_chunking = US"*",
176 .hosts_try_dane = US"*",
178 .hosts_try_fastopen = US"*",
180 .hosts_try_prdr = US"*",
183 .hosts_request_ocsp = US"*", /* hosts_request_ocsp (except under DANE; tls_client_start()) */
185 .command_timeout = 5*60,
186 .connect_timeout = 5*60,
187 .data_timeout = 5*60,
188 .final_timeout = 10*60,
189 .size_addition = 1024,
191 .hosts_max_try_hardlimit = 50,
192 .message_linelength_limit = 998,
193 .address_retry_include_sender = TRUE,
194 .dns_qualify_single = TRUE,
195 .dnssec = { .request= US"*", .require=NULL },
196 .delay_after_cutoff = TRUE,
198 .retry_include_ip_address = TRUE,
200 .tls_verify_certificates = US"system",
201 .tls_dh_min_bits = EXIM_CLIENT_DH_DEFAULT_MIN_BITS,
202 .tls_tempfail_tryclear = TRUE,
203 .tls_try_verify_hosts = US"*",
204 .tls_verify_cert_hostnames = US"*",
205 # ifndef DISABLE_TLS_RESUME
206 .host_name_extract = US"${if and {{match{$host}{.outlook.com\\$}} {match{$item}{\\N^250-([\\w.]+)\\s\\N}}} {$1}}",
210 .utf8_downconvert = US"-1",
214 { .dkim_hash = US"sha256", },
218 /* some DSN flags for use later */
220 static int rf_list[] = {rf_notify_never, rf_notify_success,
221 rf_notify_failure, rf_notify_delay };
223 static uschar *rf_names[] = { US"NEVER", US"SUCCESS", US"FAILURE", US"DELAY" };
229 static uschar *smtp_command; /* Points to last cmd for error messages */
230 static uschar *mail_command; /* Points to MAIL cmd for error messages */
231 static uschar *data_command = US""; /* Points to DATA cmd for error messages */
232 static BOOL update_waiting; /* TRUE to update the "wait" database */
234 /*XXX move to smtp_context */
235 static BOOL pipelining_active; /* current transaction is in pipe mode */
238 static unsigned ehlo_response(uschar * buf, unsigned checks);
241 /******************************************************************************/
244 smtp_deliver_init(void)
248 const pcre2_code ** re;
249 const uschar * string;
252 { ®ex_AUTH, AUTHS_REGEX },
253 { ®ex_CHUNKING, US"\\n250[\\s\\-]CHUNKING(\\s|\\n|$)" },
254 { ®ex_DSN, US"\\n250[\\s\\-]DSN(\\s|\\n|$)" },
255 { ®ex_IGNOREQUOTA, US"\\n250[\\s\\-]IGNOREQUOTA(\\s|\\n|$)" },
256 { ®ex_PIPELINING, US"\\n250[\\s\\-]PIPELINING(\\s|\\n|$)" },
257 { ®ex_SIZE, US"\\n250[\\s\\-]SIZE(\\s|\\n|$)" },
260 { ®ex_STARTTLS, US"\\n250[\\s\\-]STARTTLS(\\s|\\n|$)" },
263 { ®ex_PRDR, US"\\n250[\\s\\-]PRDR(\\s|\\n|$)" },
266 { ®ex_UTF8, US"\\n250[\\s\\-]SMTPUTF8(\\s|\\n|$)" },
268 #ifndef DISABLE_PIPE_CONNECT
269 { ®ex_EARLY_PIPE, US"\\n250[\\s\\-]" EARLY_PIPE_FEATURE_NAME "(\\s|\\n|$)" },
271 #ifdef EXPERIMENTAL_ESMTP_LIMITS
272 { ®ex_LIMITS, US"\\n250[\\s\\-]LIMITS\\s" },
276 for (struct list * l = list; l < list + nelem(list); l++)
278 *l->re = regex_must_compile(l->string, FALSE, TRUE);
282 /*************************************************
283 * Setup entry point *
284 *************************************************/
286 /* This function is called when the transport is about to be used,
287 but before running it in a sub-process. It is used for two things:
289 (1) To set the fallback host list in addresses, when delivering.
290 (2) To pass back the interface, port, protocol, and other options, for use
291 during callout verification.
294 tblock pointer to the transport instance block
295 addrlist list of addresses about to be transported
296 tf if not NULL, pointer to block in which to return options
297 uid the uid that will be set (not used)
298 gid the gid that will be set (not used)
299 errmsg place for error message (not used)
301 Returns: OK always (FAIL, DEFER not used)
305 smtp_transport_setup(transport_instance *tblock, address_item *addrlist,
306 transport_feedback *tf, uid_t uid, gid_t gid, uschar **errmsg)
308 smtp_transport_options_block *ob = SOB tblock->options_block;
310 /* Pass back options if required. This interface is getting very messy. */
314 tf->interface = ob->interface;
316 tf->protocol = ob->protocol;
317 tf->hosts = ob->hosts;
318 tf->hosts_override = ob->hosts_override;
319 tf->hosts_randomize = ob->hosts_randomize;
320 tf->gethostbyname = ob->gethostbyname;
321 tf->qualify_single = ob->dns_qualify_single;
322 tf->search_parents = ob->dns_search_parents;
323 tf->helo_data = ob->helo_data;
326 /* Set the fallback host list for all the addresses that don't have fallback
327 host lists, provided that the local host wasn't present in the original host
330 if (!testflag(addrlist, af_local_host_removed))
331 for (; addrlist; addrlist = addrlist->next)
332 if (!addrlist->fallback_hosts) addrlist->fallback_hosts = ob->fallback_hostlist;
339 /*************************************************
340 * Initialization entry point *
341 *************************************************/
343 /* Called for each instance, after its options have been read, to
344 enable consistency checks to be done, or anything else that needs
347 Argument: pointer to the transport instance block
352 smtp_transport_init(transport_instance *tblock)
354 smtp_transport_options_block *ob = SOB tblock->options_block;
355 int old_pool = store_pool;
357 /* Retry_use_local_part defaults FALSE if unset */
359 if (tblock->retry_use_local_part == TRUE_UNSET)
360 tblock->retry_use_local_part = FALSE;
362 /* Set the default port according to the protocol */
365 ob->port = strcmpic(ob->protocol, US"lmtp") == 0
367 : strcmpic(ob->protocol, US"smtps") == 0
368 ? US"smtps" : US"smtp";
370 /* Set up the setup entry point, to be called before subprocesses for this
373 tblock->setup = smtp_transport_setup;
375 /* Complain if any of the timeouts are zero. */
377 if (ob->command_timeout <= 0 || ob->data_timeout <= 0 ||
378 ob->final_timeout <= 0)
379 log_write(0, LOG_PANIC_DIE|LOG_CONFIG,
380 "command, data, or final timeout value is zero for %s transport",
383 /* If hosts_override is set and there are local hosts, set the global
384 flag that stops verify from showing router hosts. */
386 if (ob->hosts_override && ob->hosts) tblock->overrides_hosts = TRUE;
388 /* If there are any fallback hosts listed, build a chain of host items
389 for them, but do not do any lookups at this time. */
391 store_pool = POOL_PERM;
392 host_build_hostlist(&ob->fallback_hostlist, ob->fallback_hosts, FALSE);
393 store_pool = old_pool;
400 /*************************************************
401 * Set delivery info into all active addresses *
402 *************************************************/
404 /* Only addresses whose status is >= PENDING are relevant. A lesser
405 status means that an address is not currently being processed.
408 addrlist points to a chain of addresses
409 errno_value to put in each address's errno field
410 msg to put in each address's message field
411 rc to put in each address's transport_return field
412 pass_message if TRUE, set the "pass message" flag in the address
413 host if set, mark addrs as having used this host
414 smtp_greeting from peer
415 helo_response from peer
416 start points to timestamp of delivery start
418 If errno_value has the special value ERRNO_CONNECTTIMEOUT, ETIMEDOUT is put in
419 the errno field, and RTEF_CTOUT is ORed into the more_errno field, to indicate
420 this particular type of timeout.
426 set_errno(address_item *addrlist, int errno_value, uschar *msg, int rc,
427 BOOL pass_message, host_item * host,
428 #ifdef EXPERIMENTAL_DSN_INFO
429 const uschar * smtp_greeting, const uschar * helo_response,
431 struct timeval * start
435 struct timeval deliver_time;
437 if (errno_value == ERRNO_CONNECTTIMEOUT)
439 errno_value = ETIMEDOUT;
440 orvalue = RTEF_CTOUT;
442 timesince(&deliver_time, start);
444 for (address_item * addr = addrlist; addr; addr = addr->next)
445 if (addr->transport_return >= PENDING)
447 addr->basic_errno = errno_value;
448 addr->more_errno |= orvalue;
449 addr->delivery_time = deliver_time;
453 if (pass_message) setflag(addr, af_pass_message);
455 addr->transport_return = rc;
458 addr->host_used = host;
459 #ifdef EXPERIMENTAL_DSN_INFO
461 {uschar * s = Ustrchr(smtp_greeting, '\n'); if (s) *s = '\0';}
462 addr->smtp_greeting = smtp_greeting;
465 {uschar * s = Ustrchr(helo_response, '\n'); if (s) *s = '\0';}
466 addr->helo_response = helo_response;
473 set_errno_nohost(address_item * addrlist, int errno_value, uschar * msg, int rc,
474 BOOL pass_message, struct timeval * start)
476 set_errno(addrlist, errno_value, msg, rc, pass_message, NULL,
477 #ifdef EXPERIMENTAL_DSN_INFO
484 /*************************************************
485 * Check an SMTP response *
486 *************************************************/
488 /* This function is given an errno code and the SMTP response buffer
489 to analyse, together with the host identification for generating messages. It
490 sets an appropriate message and puts the first digit of the response code into
491 the yield variable. If no response was actually read, a suitable digit is
495 host the current host, to get its name for messages
496 errno_value pointer to the errno value
497 more_errno from the top address for use with ERRNO_FILTER_FAIL
498 buffer the SMTP response buffer
499 yield where to put a one-digit SMTP response code
500 message where to put an error message
501 pass_message set TRUE if message is an SMTP response
503 Returns: TRUE if an SMTP "QUIT" command should be sent, else FALSE
507 check_response(host_item *host, int *errno_value, int more_errno,
508 uschar *buffer, int *yield, uschar **message, BOOL *pass_message)
510 uschar * pl = pipelining_active ? US"pipelined " : US"";
513 *yield = '4'; /* Default setting is to give a temporary error */
517 case ETIMEDOUT: /* Handle response timeout */
518 *message = US string_sprintf("SMTP timeout after %s%s",
520 if (transport_count > 0)
521 *message = US string_sprintf("%s (%d bytes written)", *message,
525 case ERRNO_SMTPFORMAT: /* Handle malformed SMTP response */
526 s = string_printing(buffer);
527 while (isspace(*s)) s++;
529 ? string_sprintf("Malformed SMTP reply (an empty line) "
530 "in response to %s%s", pl, smtp_command)
531 : string_sprintf("Malformed SMTP reply in response to %s%s: %s",
532 pl, smtp_command, s);
535 case ERRNO_TLSFAILURE: /* Handle bad first read; can happen with
537 *message = US"bad first read from TLS conn";
540 case ERRNO_FILTER_FAIL: /* Handle a failed filter process error;
541 can't send QUIT as we mustn't end the DATA. */
542 *message = string_sprintf("transport filter process failed (%d)%s",
544 more_errno == EX_EXECFAILED ? ": unable to execute command" : "");
547 case ERRNO_CHHEADER_FAIL: /* Handle a failed add_headers expansion;
548 can't send QUIT as we mustn't end the DATA. */
550 string_sprintf("failed to expand headers_add or headers_remove: %s",
551 expand_string_message);
554 case ERRNO_WRITEINCOMPLETE: /* failure to write a complete data block */
555 *message = US"failed to write a data block";
559 case ERRNO_UTF8_FWD: /* no advertised SMTPUTF8, for international message */
560 *message = US"utf8 support required but not offered for forwarding";
561 DEBUG(D_deliver|D_transport) debug_printf("%s\n", *message);
566 /* Handle error responses from the remote mailer. */
570 *message = string_sprintf("SMTP error from remote mail server after %s%s: "
571 "%s", pl, smtp_command, s = string_printing(buffer));
572 *pass_message = TRUE;
577 /* No data was read. If there is no errno, this must be the EOF (i.e.
578 connection closed) case, which causes deferral. An explicit connection reset
579 error has the same effect. Otherwise, put the host's identity in the message,
580 leaving the errno value to be interpreted as well. In all cases, we have to
581 assume the connection is now dead. */
583 if (*errno_value == 0 || *errno_value == ECONNRESET)
585 *errno_value = ERRNO_SMTPCLOSED;
586 *message = US string_sprintf("Remote host closed connection "
587 "in response to %s%s", pl, smtp_command);
590 *message = US string_sprintf("%s [%s]", host->name, host->address);
597 /*************************************************
598 * Write error message to logs *
599 *************************************************/
601 /* This writes to the main log and to the message log.
604 host the current host
605 detail the current message (addr_item->message)
606 basic_errno the errno (addr_item->basic_errno)
612 write_logs(const host_item *host, const uschar *suffix, int basic_errno)
614 gstring * message = LOGGING(outgoing_port)
615 ? string_fmt_append(NULL, "H=%s [%s]:%d", host->name, host->address,
616 host->port == PORT_NONE ? 25 : host->port)
617 : string_fmt_append(NULL, "H=%s [%s]", host->name, host->address);
621 message = string_fmt_append(message, ": %s", suffix);
623 message = string_fmt_append(message, ": %s", strerror(basic_errno));
626 message = string_fmt_append(message, " %s", exim_errstr(basic_errno));
628 log_write(0, LOG_MAIN, "%s", string_from_gstring(message));
629 deliver_msglog("%s %s\n", tod_stamp(tod_log), message->s);
633 msglog_line(host_item * host, uschar * message)
635 deliver_msglog("%s H=%s [%s] %s\n", tod_stamp(tod_log),
636 host->name, host->address, message);
641 #ifndef DISABLE_EVENT
642 /*************************************************
643 * Post-defer action *
644 *************************************************/
646 /* This expands an arbitrary per-transport string.
647 It might, for example, be used to write to the database log.
650 addr the address item containing error information
651 host the current host
658 deferred_event_raise(address_item * addr, host_item * host, uschar * evstr)
660 uschar * action = addr->transport->event_action;
661 const uschar * save_domain;
667 save_domain = deliver_domain;
668 save_local = deliver_localpart;
670 /*XXX would ip & port already be set up? */
671 deliver_host_address = string_copy(host->address);
672 deliver_host_port = host->port == PORT_NONE ? 25 : host->port;
673 event_defer_errno = addr->basic_errno;
675 router_name = addr->router->name;
676 transport_name = addr->transport->name;
677 deliver_domain = addr->domain;
678 deliver_localpart = addr->local_part;
680 (void) event_raise(action, evstr,
682 ? addr->basic_errno > 0
683 ? string_sprintf("%s: %s", addr->message, strerror(addr->basic_errno))
684 : string_copy(addr->message)
685 : addr->basic_errno > 0
686 ? string_copy(US strerror(addr->basic_errno))
690 deliver_localpart = save_local;
691 deliver_domain = save_domain;
692 router_name = transport_name = NULL;
696 /*************************************************
697 * Reap SMTP specific responses *
698 *************************************************/
700 smtp_discard_responses(smtp_context * sx, smtp_transport_options_block * ob,
703 uschar flushbuffer[4096];
707 if (!smtp_read_response(sx, flushbuffer, sizeof(flushbuffer),
708 '2', ob->command_timeout)
709 && (errno != 0 || flushbuffer[0] == 0))
716 /* Return boolean success */
719 smtp_reap_banner(smtp_context * sx)
722 #if defined(__linux__) && defined(TCP_QUICKACK)
723 { /* Hack to get QUICKACK disabled; has to be right after 3whs, and has to on->off */
724 int sock = sx->cctx.sock;
725 struct pollfd p = {.fd = sock, .events = POLLOUT};
726 if (poll(&p, 1, 1000) >= 0) /* retval test solely for compiler quitening */
728 (void) setsockopt(sock, IPPROTO_TCP, TCP_QUICKACK, US &on, sizeof(on));
729 (void) setsockopt(sock, IPPROTO_TCP, TCP_QUICKACK, US &off, sizeof(off));
733 good_response = smtp_read_response(sx, sx->buffer, sizeof(sx->buffer),
734 '2', (SOB sx->conn_args.ob)->command_timeout);
735 #ifdef EXPERIMENTAL_DSN_INFO
736 sx->smtp_greeting = string_copy(sx->buffer);
738 return good_response;
742 smtp_reap_ehlo(smtp_context * sx)
744 if (!smtp_read_response(sx, sx->buffer, sizeof(sx->buffer), '2',
745 (SOB sx->conn_args.ob)->command_timeout))
747 if (errno != 0 || sx->buffer[0] == 0 || sx->lmtp)
749 #ifdef EXPERIMENTAL_DSN_INFO
750 sx->helo_response = string_copy(sx->buffer);
756 #ifdef EXPERIMENTAL_DSN_INFO
757 sx->helo_response = string_copy(sx->buffer);
759 #ifndef DISABLE_EVENT
760 (void) event_raise(sx->conn_args.tblock->event_action,
761 US"smtp:ehlo", sx->buffer, NULL);
767 /******************************************************************************/
769 #ifdef EXPERIMENTAL_ESMTP_LIMITS
770 /* If TLS, or TLS not offered, called with the EHLO response in the buffer.
771 Check it for a LIMITS keyword and parse values into the smtp context structure.
773 We don't bother with peers that we won't talk TLS to, even though they can,
774 just ignore their LIMITS advice (if any) and treat them as if they do not.
775 This saves us dealing with a duplicate set of values. */
778 ehlo_response_limits_read(smtp_context * sx)
782 /* matches up to just after the first space after the keyword */
784 if (regex_match(regex_LIMITS, sx->buffer, -1, &match))
785 for (const uschar * s = sx->buffer + Ustrlen(match); *s; )
787 while (isspace(*s)) s++;
788 if (*s == '\n') break;
790 if (strncmpic(s, US"MAILMAX=", 8) == 0)
792 sx->peer_limit_mail = atoi(CS (s += 8));
793 while (isdigit(*s)) s++;
795 else if (strncmpic(s, US"RCPTMAX=", 8) == 0)
797 sx->peer_limit_rcpt = atoi(CS (s += 8));
798 while (isdigit(*s)) s++;
800 else if (strncmpic(s, US"RCPTDOMAINMAX=", 14) == 0)
802 sx->peer_limit_rcptdom = atoi(CS (s += 14));
803 while (isdigit(*s)) s++;
806 while (*s && !isspace(*s)) s++;
810 /* Apply given values to the current connection */
812 ehlo_limits_apply(smtp_context * sx,
813 unsigned limit_mail, unsigned limit_rcpt, unsigned limit_rcptdom)
815 if (limit_mail && limit_mail < sx->max_mail) sx->max_mail = limit_mail;
816 if (limit_rcpt && limit_rcpt < sx->max_rcpt) sx->max_rcpt = limit_rcpt;
819 DEBUG(D_transport) debug_printf("will treat as !multi_domain\n");
820 sx->single_rcpt_domain = TRUE;
824 /* Apply values from EHLO-resp to the current connection */
826 ehlo_response_limits_apply(smtp_context * sx)
828 ehlo_limits_apply(sx, sx->peer_limit_mail, sx->peer_limit_rcpt,
829 sx->peer_limit_rcptdom);
832 /* Apply values read from cache to the current connection */
834 ehlo_cache_limits_apply(smtp_context * sx)
836 ehlo_limits_apply(sx, sx->ehlo_resp.limit_mail, sx->ehlo_resp.limit_rcpt,
837 sx->ehlo_resp.limit_rcptdom);
841 /******************************************************************************/
843 #ifndef DISABLE_PIPE_CONNECT
845 ehlo_cache_key(const smtp_context * sx)
847 host_item * host = sx->conn_args.host;
848 return Ustrchr(host->address, ':')
849 ? string_sprintf("[%s]:%d.EHLO", host->address,
850 host->port == PORT_NONE ? sx->port : host->port)
851 : string_sprintf("%s:%d.EHLO", host->address,
852 host->port == PORT_NONE ? sx->port : host->port);
855 /* Cache EHLO-response info for use by early-pipe.
857 - During a normal flow on EHLO response (either cleartext or under TLS),
858 when we are willing to do PIPECONNECT and it is offered
859 - During an early-pipe flow on receiving the actual EHLO response and noting
860 disparity versus the cached info used, when PIPECONNECT is still being offered
862 We assume that suitable values have been set in the sx.ehlo_resp structure for
863 features and auths; we handle the copy of limits. */
866 write_ehlo_cache_entry(smtp_context * sx)
868 open_db dbblock, * dbm_file;
870 #ifdef EXPERIMENTAL_ESMTP_LIMITS
871 sx->ehlo_resp.limit_mail = sx->peer_limit_mail;
872 sx->ehlo_resp.limit_rcpt = sx->peer_limit_rcpt;
873 sx->ehlo_resp.limit_rcptdom = sx->peer_limit_rcptdom;
876 if ((dbm_file = dbfn_open(US"misc", O_RDWR, &dbblock, TRUE, TRUE)))
878 uschar * ehlo_resp_key = ehlo_cache_key(sx);
879 dbdata_ehlo_resp er = { .data = sx->ehlo_resp };
882 #ifdef EXPERIMENTAL_ESMTP_LIMITS
883 if (sx->ehlo_resp.limit_mail || sx->ehlo_resp.limit_rcpt || sx->ehlo_resp.limit_rcptdom)
884 debug_printf("writing clr %04x/%04x cry %04x/%04x lim %05d/%05d/%05d\n",
885 sx->ehlo_resp.cleartext_features, sx->ehlo_resp.cleartext_auths,
886 sx->ehlo_resp.crypted_features, sx->ehlo_resp.crypted_auths,
887 sx->ehlo_resp.limit_mail, sx->ehlo_resp.limit_rcpt,
888 sx->ehlo_resp.limit_rcptdom);
891 debug_printf("writing clr %04x/%04x cry %04x/%04x\n",
892 sx->ehlo_resp.cleartext_features, sx->ehlo_resp.cleartext_auths,
893 sx->ehlo_resp.crypted_features, sx->ehlo_resp.crypted_auths);
895 dbfn_write(dbm_file, ehlo_resp_key, &er, (int)sizeof(er));
896 dbfn_close(dbm_file);
901 invalidate_ehlo_cache_entry(smtp_context * sx)
903 open_db dbblock, * dbm_file;
905 if ( sx->early_pipe_active
906 && (dbm_file = dbfn_open(US"misc", O_RDWR, &dbblock, TRUE, TRUE)))
908 uschar * ehlo_resp_key = ehlo_cache_key(sx);
909 dbfn_delete(dbm_file, ehlo_resp_key);
910 dbfn_close(dbm_file);
915 read_ehlo_cache_entry(smtp_context * sx)
920 if (!(dbm_file = dbfn_open(US"misc", O_RDONLY, &dbblock, FALSE, TRUE)))
921 { DEBUG(D_transport) debug_printf("ehlo-cache: no misc DB\n"); }
924 uschar * ehlo_resp_key = ehlo_cache_key(sx);
925 dbdata_ehlo_resp * er;
927 if (!(er = dbfn_read_enforce_length(dbm_file, ehlo_resp_key, sizeof(dbdata_ehlo_resp))))
928 { DEBUG(D_transport) debug_printf("no ehlo-resp record\n"); }
929 else if (time(NULL) - er->time_stamp > retry_data_expire)
931 DEBUG(D_transport) debug_printf("ehlo-resp record too old\n");
932 dbfn_close(dbm_file);
933 if ((dbm_file = dbfn_open(US"misc", O_RDWR, &dbblock, TRUE, TRUE)))
934 dbfn_delete(dbm_file, ehlo_resp_key);
939 #ifdef EXPERIMENTAL_ESMTP_LIMITS
940 if (er->data.limit_mail || er->data.limit_rcpt || er->data.limit_rcptdom)
941 debug_printf("EHLO response bits from cache:"
942 " cleartext 0x%04x/0x%04x crypted 0x%04x/0x%04x lim %05d/%05d/%05d\n",
943 er->data.cleartext_features, er->data.cleartext_auths,
944 er->data.crypted_features, er->data.crypted_auths,
945 er->data.limit_mail, er->data.limit_rcpt, er->data.limit_rcptdom);
948 debug_printf("EHLO response bits from cache:"
949 " cleartext 0x%04x/0x%04x crypted 0x%04x/0x%04x\n",
950 er->data.cleartext_features, er->data.cleartext_auths,
951 er->data.crypted_features, er->data.crypted_auths);
953 sx->ehlo_resp = er->data;
954 #ifdef EXPERIMENTAL_ESMTP_LIMITS
955 ehlo_cache_limits_apply(sx);
957 dbfn_close(dbm_file);
960 dbfn_close(dbm_file);
967 /* Return an auths bitmap for the set of AUTH methods offered by the server
968 which match our authenticators. */
970 static unsigned short
971 study_ehlo_auths(smtp_context * sx)
976 unsigned short authbits = 0;
978 if (!sx->esmtp) return 0;
979 if (!regex_AUTH) regex_AUTH = regex_must_compile(AUTHS_REGEX, FALSE, TRUE);
980 if (!regex_match_and_setup(regex_AUTH, sx->buffer, 0, -1)) return 0;
981 expand_nmax = -1; /* reset */
982 names = string_copyn(expand_nstring[1], expand_nlength[1]);
984 for (au = auths, authnum = 0; au; au = au->next, authnum++) if (au->client)
986 const uschar * list = names;
988 for (int sep = ' '; s = string_nextinlist(&list, &sep, NULL, 0); )
989 if (strcmpic(au->public_name, s) == 0)
990 { authbits |= BIT(authnum); break; }
994 debug_printf("server offers %s AUTH, methods '%s', bitmap 0x%04x\n",
995 tls_out.active.sock >= 0 ? "crypted" : "plaintext", names, authbits);
997 if (tls_out.active.sock >= 0)
998 sx->ehlo_resp.crypted_auths = authbits;
1000 sx->ehlo_resp.cleartext_auths = authbits;
1007 /* Wait for and check responses for early-pipelining.
1009 Called from the lower-level smtp_read_response() function
1010 used for general code that assume synchronisation, if context
1011 flags indicate outstanding early-pipelining commands. Also
1012 called fom sync_responses() which handles pipelined commands.
1015 sx smtp connection context
1016 countp number of outstanding responses, adjusted on return
1020 DEFER error on first read of TLS'd conn
1021 FAIL SMTP error in response
1024 smtp_reap_early_pipe(smtp_context * sx, int * countp)
1026 BOOL pending_BANNER = sx->pending_BANNER;
1027 BOOL pending_EHLO = sx->pending_EHLO;
1030 sx->pending_BANNER = FALSE; /* clear early to avoid recursion */
1031 sx->pending_EHLO = FALSE;
1035 DEBUG(D_transport) debug_printf("%s expect banner\n", __FUNCTION__);
1037 if (!smtp_reap_banner(sx))
1039 DEBUG(D_transport) debug_printf("bad banner\n");
1040 if (tls_out.active.sock >= 0) rc = DEFER;
1047 unsigned peer_offered;
1048 unsigned short authbits = 0, * ap;
1050 DEBUG(D_transport) debug_printf("%s expect ehlo\n", __FUNCTION__);
1052 if (!smtp_reap_ehlo(sx))
1054 DEBUG(D_transport) debug_printf("bad response for EHLO\n");
1055 if (tls_out.active.sock >= 0) rc = DEFER;
1059 /* Compare the actual EHLO response extensions and AUTH methods to the cached
1060 value we assumed; on difference, dump or rewrite the cache and arrange for a
1063 ap = tls_out.active.sock < 0
1064 ? &sx->ehlo_resp.cleartext_auths : &sx->ehlo_resp.crypted_auths;
1066 peer_offered = ehlo_response(sx->buffer,
1067 (tls_out.active.sock < 0 ? OPTION_TLS : 0)
1068 | OPTION_CHUNKING | OPTION_PRDR | OPTION_DSN | OPTION_PIPE | OPTION_SIZE
1069 | OPTION_UTF8 | OPTION_EARLY_PIPE
1071 #ifdef EXPERIMENTAL_ESMTP_LIMITS
1072 if (tls_out.active.sock >= 0 || !(peer_offered & OPTION_TLS))
1073 ehlo_response_limits_read(sx);
1075 /*XXX RESUMP - EHLO-resp avail here int sx->buffer */
1076 if ( peer_offered != sx->peer_offered
1077 || (authbits = study_ehlo_auths(sx)) != *ap)
1080 debug_printf("EHLO %s extensions changed, 0x%04x/0x%04x -> 0x%04x/0x%04x\n",
1081 tls_out.active.sock < 0 ? "cleartext" : "crypted",
1082 sx->peer_offered, *ap, peer_offered, authbits);
1083 if (peer_offered & OPTION_EARLY_PIPE)
1085 *(tls_out.active.sock < 0
1086 ? &sx->ehlo_resp.cleartext_features : &sx->ehlo_resp.crypted_features) =
1089 write_ehlo_cache_entry(sx);
1092 invalidate_ehlo_cache_entry(sx);
1094 return OK; /* just carry on */
1096 #ifdef EXPERIMENTAL_ESMTP_LIMITS
1097 /* If we are handling LIMITS, compare the actual EHLO LIMITS values with the
1098 cached values and invalidate cache if different. OK to carry on with
1099 connect since values are advisory. */
1101 if ( (tls_out.active.sock >= 0 || !(peer_offered & OPTION_TLS))
1102 && ( sx->peer_limit_mail != sx->ehlo_resp.limit_mail
1103 || sx->peer_limit_rcpt != sx->ehlo_resp.limit_rcpt
1104 || sx->peer_limit_rcptdom != sx->ehlo_resp.limit_rcptdom
1109 debug_printf("EHLO LIMITS changed:");
1110 if (sx->peer_limit_mail != sx->ehlo_resp.limit_mail)
1111 debug_printf(" MAILMAX %u -> %u\n", sx->ehlo_resp.limit_mail, sx->peer_limit_mail);
1112 else if (sx->peer_limit_rcpt != sx->ehlo_resp.limit_rcpt)
1113 debug_printf(" RCPTMAX %u -> %u\n", sx->ehlo_resp.limit_rcpt, sx->peer_limit_rcpt);
1115 debug_printf(" RCPTDOMAINMAX %u -> %u\n", sx->ehlo_resp.limit_rcptdom, sx->peer_limit_rcptdom);
1117 invalidate_ehlo_cache_entry(sx);
1125 invalidate_ehlo_cache_entry(sx);
1126 (void) smtp_discard_responses(sx, sx->conn_args.ob, *countp);
1129 #endif /*!DISABLE_PIPE_CONNECT*/
1132 /*************************************************
1133 * Synchronize SMTP responses *
1134 *************************************************/
1136 /* This function is called from smtp_deliver() to receive SMTP responses from
1137 the server, and match them up with the commands to which they relate. When
1138 PIPELINING is not in use, this function is called after every command, and is
1139 therefore somewhat over-engineered, but it is simpler to use a single scheme
1140 that works both with and without PIPELINING instead of having two separate sets
1143 The set of commands that are buffered up with pipelining may start with MAIL
1144 and may end with DATA; in between are RCPT commands that correspond to the
1145 addresses whose status is PENDING_DEFER. All other commands (STARTTLS, AUTH,
1146 etc.) are never buffered.
1148 Errors after MAIL or DATA abort the whole process leaving the response in the
1149 buffer. After MAIL, pending responses are flushed, and the original command is
1150 re-instated in big_buffer for error messages. For RCPT commands, the remote is
1151 permitted to reject some recipient addresses while accepting others. However
1152 certain errors clearly abort the whole process. Set the value in
1153 transport_return to PENDING_OK if the address is accepted. If there is a
1154 subsequent general error, it will get reset accordingly. If not, it will get
1155 converted to OK at the end.
1158 sx smtp connection context
1159 count the number of responses to read
1160 pending_DATA 0 if last command sent was not DATA
1161 +1 if previously had a good recipient
1162 -1 if not previously had a good recipient
1164 Returns: 3 if at least one address had 2xx and one had 5xx
1165 2 if at least one address had 5xx but none had 2xx
1166 1 if at least one host had a 2xx response, but none had 5xx
1167 0 no address had 2xx or 5xx but no errors (all 4xx, or just DATA)
1168 -1 timeout while reading RCPT response
1169 -2 I/O or other non-response error for RCPT
1170 -3 DATA or MAIL failed - errno and buffer set
1171 -4 banner or EHLO failed (early-pipelining)
1172 -5 banner or EHLO failed (early-pipelining, TLS)
1176 sync_responses(smtp_context * sx, int count, int pending_DATA)
1178 address_item * addr = sx->sync_addr;
1179 smtp_transport_options_block * ob = sx->conn_args.ob;
1182 #ifndef DISABLE_PIPE_CONNECT
1184 if ((rc = smtp_reap_early_pipe(sx, &count)) != OK)
1185 return rc == FAIL ? -4 : -5;
1188 /* Handle the response for a MAIL command. On error, reinstate the original
1189 command in big_buffer for error message use, and flush any further pending
1190 responses before returning, except after I/O errors and timeouts. */
1192 if (sx->pending_MAIL)
1194 DEBUG(D_transport) debug_printf("%s expect mail\n", __FUNCTION__);
1196 sx->pending_MAIL = sx->RCPT_452 = FALSE;
1197 if (!smtp_read_response(sx, sx->buffer, sizeof(sx->buffer),
1198 '2', ob->command_timeout))
1200 DEBUG(D_transport) debug_printf("bad response for MAIL\n");
1201 Ustrcpy(big_buffer, mail_command); /* Fits, because it came from there! */
1202 if (errno == ERRNO_TLSFAILURE)
1204 if (errno == 0 && sx->buffer[0] != 0)
1207 if (sx->buffer[0] == '4')
1209 save_errno = ERRNO_MAIL4XX;
1210 addr->more_errno |= ((sx->buffer[1] - '0')*10 + sx->buffer[2] - '0') << 8;
1212 count = smtp_discard_responses(sx, ob, count);
1216 if (pending_DATA) count--; /* Number of RCPT responses to come */
1217 while (count-- > 0) /* Mark any pending addrs with the host used */
1219 while (addr->transport_return != PENDING_DEFER) addr = addr->next;
1220 addr->host_used = sx->conn_args.host;
1227 if (pending_DATA) count--; /* Number of RCPT responses to come */
1229 /* Read and handle the required number of RCPT responses, matching each one up
1230 with an address by scanning for the next address whose status is PENDING_DEFER.
1235 while (addr->transport_return != PENDING_DEFER)
1236 if (!(addr = addr->next))
1239 /* The address was accepted */
1240 addr->host_used = sx->conn_args.host;
1242 DEBUG(D_transport) debug_printf("%s expect rcpt for %s\n", __FUNCTION__, addr->address);
1243 if (smtp_read_response(sx, sx->buffer, sizeof(sx->buffer),
1244 '2', ob->command_timeout))
1247 addr->transport_return = PENDING_OK;
1249 /* If af_dr_retry_exists is set, there was a routing delay on this address;
1250 ensure that any address-specific retry record is expunged. We do this both
1251 for the basic key and for the version that also includes the sender. */
1253 if (testflag(addr, af_dr_retry_exists))
1255 uschar *altkey = string_sprintf("%s:<%s>", addr->address_retry_key,
1257 retry_add_item(addr, altkey, rf_delete);
1258 retry_add_item(addr, addr->address_retry_key, rf_delete);
1262 /* Error on first TLS read */
1264 else if (errno == ERRNO_TLSFAILURE)
1267 /* Timeout while reading the response */
1269 else if (errno == ETIMEDOUT)
1271 uschar *message = string_sprintf("SMTP timeout after RCPT TO:<%s>",
1272 transport_rcpt_address(addr, sx->conn_args.tblock->rcpt_include_affixes));
1273 set_errno_nohost(sx->first_addr, ETIMEDOUT, message, DEFER, FALSE, &sx->delivery_start);
1274 retry_add_item(addr, addr->address_retry_key, 0);
1275 update_waiting = FALSE;
1279 /* Handle other errors in obtaining an SMTP response by returning -1. This
1280 will cause all the addresses to be deferred. Restore the SMTP command in
1281 big_buffer for which we are checking the response, so the error message
1284 else if (errno != 0 || sx->buffer[0] == 0)
1286 gstring gs = { .size = big_buffer_size, .ptr = 0, .s = big_buffer }, * g = &gs;
1288 /* Use taint-unchecked routines for writing into big_buffer, trusting
1289 that we'll never expand it. */
1291 g = string_fmt_append_f(g, SVFMT_TAINT_NOCHK, "RCPT TO:<%s>",
1292 transport_rcpt_address(addr, sx->conn_args.tblock->rcpt_include_affixes));
1293 string_from_gstring(g);
1297 /* Handle SMTP permanent and temporary response codes. */
1302 string_sprintf("SMTP error from remote mail server after RCPT TO:<%s>: "
1303 "%s", transport_rcpt_address(addr, sx->conn_args.tblock->rcpt_include_affixes),
1304 string_printing(sx->buffer));
1305 setflag(addr, af_pass_message);
1307 msglog_line(sx->conn_args.host, addr->message);
1309 /* The response was 5xx */
1311 if (sx->buffer[0] == '5')
1313 addr->transport_return = FAIL;
1317 /* The response was 4xx */
1321 addr->transport_return = DEFER;
1322 addr->basic_errno = ERRNO_RCPT4XX;
1323 addr->more_errno |= ((sx->buffer[1] - '0')*10 + sx->buffer[2] - '0') << 8;
1327 #ifndef DISABLE_EVENT
1328 event_defer_errno = addr->more_errno;
1329 msg_event_raise(US"msg:rcpt:host:defer", addr);
1331 /* If a 452 and we've had at least one 2xx or 5xx, set next_addr to the
1332 start point for another MAIL command. */
1334 if (addr->more_errno >> 8 == 52 && yield & 3)
1336 if (!sx->RCPT_452) /* initialised at MAIL-ack above */
1339 debug_printf("%s: seen first 452 too-many-rcpts\n", __FUNCTION__);
1340 sx->RCPT_452 = TRUE;
1341 sx->next_addr = addr;
1343 addr->transport_return = PENDING_DEFER;
1344 addr->basic_errno = 0;
1348 /* Log temporary errors if there are more hosts to be tried.
1349 If not, log this last one in the == line. */
1351 if (sx->conn_args.host->next)
1352 if (LOGGING(outgoing_port))
1353 log_write(0, LOG_MAIN, "H=%s [%s]:%d %s", sx->conn_args.host->name,
1354 sx->conn_args.host->address,
1355 sx->port == PORT_NONE ? 25 : sx->port, addr->message);
1357 log_write(0, LOG_MAIN, "H=%s [%s]: %s", sx->conn_args.host->name,
1358 sx->conn_args.host->address, addr->message);
1360 #ifndef DISABLE_EVENT
1362 msg_event_raise(US"msg:rcpt:defer", addr);
1365 /* Do not put this message on the list of those waiting for specific
1366 hosts, as otherwise it is likely to be tried too often. */
1368 update_waiting = FALSE;
1370 /* Add a retry item for the address so that it doesn't get tried again
1371 too soon. If address_retry_include_sender is true, add the sender address
1372 to the retry key. */
1374 retry_add_item(addr,
1375 ob->address_retry_include_sender
1376 ? string_sprintf("%s:<%s>", addr->address_retry_key, sender_address)
1377 : addr->address_retry_key,
1383 if (count && !(addr = addr->next))
1385 } /* Loop for next RCPT response */
1387 /* Update where to start at for the next block of responses, unless we
1388 have already handled all the addresses. */
1390 if (addr) sx->sync_addr = addr->next;
1392 /* Handle a response to DATA. If we have not had any good recipients, either
1393 previously or in this block, the response is ignored. */
1395 if (pending_DATA != 0)
1397 DEBUG(D_transport) debug_printf("%s expect data\n", __FUNCTION__);
1398 if (!smtp_read_response(sx, sx->buffer, sizeof(sx->buffer),
1399 '3', ob->command_timeout))
1405 if (errno == ERRNO_TLSFAILURE) /* Error on first TLS read */
1408 if (pending_DATA > 0 || (yield & 1) != 0)
1410 if (errno == 0 && sx->buffer[0] == '4')
1412 errno = ERRNO_DATA4XX;
1413 sx->first_addr->more_errno |= ((sx->buffer[1] - '0')*10 + sx->buffer[2] - '0') << 8;
1417 (void)check_response(sx->conn_args.host, &errno, 0, sx->buffer, &code, &msg, &pass_message);
1418 DEBUG(D_transport) debug_printf("%s\nerror for DATA ignored: pipelining "
1419 "is in use and there were no good recipients\n", msg);
1423 /* All responses read and handled; MAIL (if present) received 2xx and DATA (if
1424 present) received 3xx. If any RCPTs were handled and yielded anything other
1425 than 4xx, yield will be set non-zero. */
1434 /* Try an authenticator's client entry */
1437 try_authenticator(smtp_context * sx, auth_instance * au)
1439 smtp_transport_options_block * ob = sx->conn_args.ob; /* transport options */
1440 host_item * host = sx->conn_args.host; /* host to deliver to */
1443 /* Set up globals for error messages */
1445 authenticator_name = au->name;
1446 driver_srcfile = au->srcfile;
1447 driver_srcline = au->srcline;
1449 sx->outblock.authenticating = TRUE;
1450 rc = (au->info->clientcode)(au, sx, ob->command_timeout,
1451 sx->buffer, sizeof(sx->buffer));
1452 sx->outblock.authenticating = FALSE;
1453 driver_srcfile = authenticator_name = NULL; driver_srcline = 0;
1454 DEBUG(D_transport) debug_printf("%s authenticator yielded %d\n", au->name, rc);
1456 /* A temporary authentication failure must hold up delivery to
1457 this host. After a permanent authentication failure, we carry on
1458 to try other authentication methods. If all fail hard, try to
1459 deliver the message unauthenticated unless require_auth was set. */
1464 f.smtp_authenticated = TRUE; /* stops the outer loop */
1465 client_authenticator = au->name;
1466 if (au->set_client_id)
1467 client_authenticated_id = expand_string(au->set_client_id);
1470 /* Failure after writing a command */
1475 /* Failure after reading a response */
1478 if (errno != 0 || sx->buffer[0] != '5') return FAIL;
1479 log_write(0, LOG_MAIN, "%s authenticator failed H=%s [%s] %s",
1480 au->name, host->name, host->address, sx->buffer);
1483 /* Failure by some other means. In effect, the authenticator
1484 decided it wasn't prepared to handle this case. Typically this
1485 is the result of "fail" in an expansion string. Do we need to
1486 log anything here? Feb 2006: a message is now put in the buffer
1487 if logging is required. */
1490 if (*sx->buffer != 0)
1491 log_write(0, LOG_MAIN, "%s authenticator cancelled "
1492 "authentication H=%s [%s] %s", au->name, host->name,
1493 host->address, sx->buffer);
1496 /* Internal problem, message in buffer. */
1499 set_errno_nohost(sx->addrlist, ERRNO_AUTHPROB, string_copy(sx->buffer),
1500 DEFER, FALSE, &sx->delivery_start);
1509 /* Do the client side of smtp-level authentication.
1512 sx smtp connection context
1514 sx->buffer should have the EHLO response from server (gets overwritten)
1517 OK Success, or failed (but not required): global "smtp_authenticated" set
1518 DEFER Failed authentication (and was required)
1519 ERROR Internal problem
1521 FAIL_SEND Failed communications - transmit
1526 smtp_auth(smtp_context * sx)
1528 host_item * host = sx->conn_args.host; /* host to deliver to */
1529 smtp_transport_options_block * ob = sx->conn_args.ob; /* transport options */
1530 int require_auth = verify_check_given_host(CUSS &ob->hosts_require_auth, host);
1531 #ifndef DISABLE_PIPE_CONNECT
1532 unsigned short authbits = tls_out.active.sock >= 0
1533 ? sx->ehlo_resp.crypted_auths : sx->ehlo_resp.cleartext_auths;
1535 uschar * fail_reason = US"server did not advertise AUTH support";
1537 f.smtp_authenticated = FALSE;
1538 client_authenticator = client_authenticated_id = client_authenticated_sender = NULL;
1541 regex_AUTH = regex_must_compile(AUTHS_REGEX, FALSE, TRUE);
1543 /* Is the server offering AUTH? */
1547 #ifndef DISABLE_PIPE_CONNECT
1548 sx->early_pipe_active ? authbits
1551 regex_match_and_setup(regex_AUTH, sx->buffer, 0, -1)
1554 uschar * names = NULL;
1555 expand_nmax = -1; /* reset */
1557 #ifndef DISABLE_PIPE_CONNECT
1558 if (!sx->early_pipe_active)
1560 names = string_copyn(expand_nstring[1], expand_nlength[1]);
1562 /* Must not do this check until after we have saved the result of the
1563 regex match above as the check could be another RE. */
1565 if ( require_auth == OK
1566 || verify_check_given_host(CUSS &ob->hosts_try_auth, host) == OK)
1568 DEBUG(D_transport) debug_printf("scanning authentication mechanisms\n");
1569 fail_reason = US"no common mechanisms were found";
1571 #ifndef DISABLE_PIPE_CONNECT
1572 if (sx->early_pipe_active)
1574 /* Scan our authenticators (which support use by a client and were offered
1575 by the server (checked at cache-write time)), not suppressed by
1576 client_condition. If one is found, attempt to authenticate by calling its
1577 client function. We are limited to supporting up to 16 authenticator
1578 public-names by the number of bits in a short. */
1584 for (bitnum = 0, au = auths;
1585 !f.smtp_authenticated && au && bitnum < 16;
1586 bitnum++, au = au->next) if (authbits & BIT(bitnum))
1588 if ( au->client_condition
1589 && !expand_check_condition(au->client_condition, au->name,
1590 US"client authenticator"))
1592 DEBUG(D_transport) debug_printf("skipping %s authenticator: %s\n",
1593 au->name, "client_condition is false");
1597 /* Found data for a listed mechanism. Call its client entry. Set
1598 a flag in the outblock so that data is overwritten after sending so
1599 that reflections don't show it. */
1601 fail_reason = US"authentication attempt(s) failed";
1603 if ((rc = try_authenticator(sx, au)) != OK)
1610 /* Scan the configured authenticators looking for one which is configured
1611 for use as a client, which is not suppressed by client_condition, and
1612 whose name matches an authentication mechanism supported by the server.
1613 If one is found, attempt to authenticate by calling its client function.
1616 for (auth_instance * au = auths; !f.smtp_authenticated && au; au = au->next)
1621 || ( au->client_condition
1622 && !expand_check_condition(au->client_condition, au->name,
1623 US"client authenticator")))
1625 DEBUG(D_transport) debug_printf("skipping %s authenticator: %s\n",
1627 (au->client)? "client_condition is false" :
1628 "not configured as a client");
1632 /* Loop to scan supported server mechanisms */
1636 int len = Ustrlen(au->public_name);
1639 while (isspace(*p)) p++;
1641 if (strncmpic(au->public_name, p, len) != 0 ||
1642 (p[len] != 0 && !isspace(p[len])))
1644 while (*p != 0 && !isspace(*p)) p++;
1648 /* Found data for a listed mechanism. Call its client entry. Set
1649 a flag in the outblock so that data is overwritten after sending so
1650 that reflections don't show it. */
1652 fail_reason = US"authentication attempt(s) failed";
1654 if ((rc = try_authenticator(sx, au)) != OK)
1657 break; /* If not authenticated, try next authenticator */
1658 } /* Loop for scanning supported server mechanisms */
1659 } /* Loop for further authenticators */
1663 /* If we haven't authenticated, but are required to, give up. */
1665 if (require_auth == OK && !f.smtp_authenticated)
1667 #ifndef DISABLE_PIPE_CONNECT
1668 invalidate_ehlo_cache_entry(sx);
1670 set_errno_nohost(sx->addrlist, ERRNO_AUTHFAIL,
1671 string_sprintf("authentication required but %s", fail_reason), DEFER,
1672 FALSE, &sx->delivery_start);
1680 /* Construct AUTH appendix string for MAIL TO */
1683 sx context for smtp connection
1684 p point in sx->buffer to build string
1685 addrlist chain of potential addresses to deliver
1687 Globals f.smtp_authenticated
1688 client_authenticated_sender
1689 Return True on error, otherwise buffer has (possibly empty) terminated string
1693 smtp_mail_auth_str(smtp_context * sx, uschar * p, address_item * addrlist)
1695 smtp_transport_options_block * ob = sx->conn_args.ob;
1696 uschar * local_authenticated_sender = authenticated_sender;
1699 debug_printf("smtp_mail_auth_str: as<%s> os<%s> SA<%s>\n",
1700 authenticated_sender, ob->authenticated_sender, f.smtp_authenticated?"Y":"N");
1703 if (ob->authenticated_sender)
1705 uschar * new = expand_string(ob->authenticated_sender);
1708 if (!f.expand_string_forcedfail)
1710 uschar *message = string_sprintf("failed to expand "
1711 "authenticated_sender: %s", expand_string_message);
1712 set_errno_nohost(addrlist, ERRNO_EXPANDFAIL, message, DEFER, FALSE, &sx->delivery_start);
1717 local_authenticated_sender = new;
1720 /* Add the authenticated sender address if present */
1722 if ( (f.smtp_authenticated || ob->authenticated_sender_force)
1723 && local_authenticated_sender)
1725 string_format_nt(p, sizeof(sx->buffer) - (p-sx->buffer), " AUTH=%s",
1726 auth_xtextencode(local_authenticated_sender,
1727 Ustrlen(local_authenticated_sender)));
1728 client_authenticated_sender = string_copy(local_authenticated_sender);
1738 typedef struct smtp_compare_s
1740 uschar * current_sender_address;
1741 struct transport_instance * tblock;
1745 /* Create a unique string that identifies this message, it is based on
1746 sender_address, helo_data and tls_certificate if enabled.
1750 smtp_local_identity(uschar * sender, struct transport_instance * tblock)
1752 address_item * addr1;
1753 uschar * if1 = US"";
1754 uschar * helo1 = US"";
1756 uschar * tlsc1 = US"";
1758 uschar * save_sender_address = sender_address;
1759 uschar * local_identity = NULL;
1760 smtp_transport_options_block * ob = SOB tblock->options_block;
1762 sender_address = sender;
1764 addr1 = deliver_make_addr (sender, TRUE);
1765 deliver_set_expansions(addr1);
1768 if1 = expand_string(ob->interface);
1771 helo1 = expand_string(ob->helo_data);
1774 if (ob->tls_certificate)
1775 tlsc1 = expand_string(ob->tls_certificate);
1776 local_identity = string_sprintf ("%s^%s^%s", if1, helo1, tlsc1);
1778 local_identity = string_sprintf ("%s^%s", if1, helo1);
1781 deliver_set_expansions(NULL);
1782 sender_address = save_sender_address;
1784 return local_identity;
1789 /* This routine is a callback that is called from transport_check_waiting.
1790 This function will evaluate the incoming message versus the previous
1791 message. If the incoming message is using a different local identity then
1792 we will veto this new message. */
1795 smtp_are_same_identities(uschar * message_id, smtp_compare_t * s_compare)
1797 uschar * message_local_identity,
1798 * current_local_identity,
1799 * new_sender_address;
1801 current_local_identity =
1802 smtp_local_identity(s_compare->current_sender_address, s_compare->tblock);
1804 if (!(new_sender_address = spool_sender_from_msgid(message_id)))
1808 message_local_identity =
1809 smtp_local_identity(new_sender_address, s_compare->tblock);
1811 return Ustrcmp(current_local_identity, message_local_identity) == 0;
1817 ehlo_response(uschar * buf, unsigned checks)
1819 PCRE2_SIZE bsize = Ustrlen(buf);
1820 pcre2_match_data * md = pcre2_match_data_create(1, pcre_gen_ctx);
1822 /* debug_printf("%s: check for 0x%04x\n", __FUNCTION__, checks); */
1825 if ( checks & OPTION_TLS
1826 && pcre2_match(regex_STARTTLS,
1827 (PCRE2_SPTR)buf, bsize, 0, PCRE_EOPT, md, pcre_mtc_ctx) < 0)
1829 checks &= ~OPTION_TLS;
1831 if ( checks & OPTION_IGNQ
1832 && pcre2_match(regex_IGNOREQUOTA,
1833 (PCRE2_SPTR)buf, bsize, 0, PCRE_EOPT, md, pcre_mtc_ctx) < 0)
1834 checks &= ~OPTION_IGNQ;
1836 if ( checks & OPTION_CHUNKING
1837 && pcre2_match(regex_CHUNKING,
1838 (PCRE2_SPTR)buf, bsize, 0, PCRE_EOPT, md, pcre_mtc_ctx) < 0)
1839 checks &= ~OPTION_CHUNKING;
1841 #ifndef DISABLE_PRDR
1842 if ( checks & OPTION_PRDR
1843 && pcre2_match(regex_PRDR,
1844 (PCRE2_SPTR)buf, bsize, 0, PCRE_EOPT, md, pcre_mtc_ctx) < 0)
1846 checks &= ~OPTION_PRDR;
1849 if ( checks & OPTION_UTF8
1850 && pcre2_match(regex_UTF8,
1851 (PCRE2_SPTR)buf, bsize, 0, PCRE_EOPT, md, pcre_mtc_ctx) < 0)
1853 checks &= ~OPTION_UTF8;
1855 if ( checks & OPTION_DSN
1856 && pcre2_match(regex_DSN,
1857 (PCRE2_SPTR)buf, bsize, 0, PCRE_EOPT, md, pcre_mtc_ctx) < 0)
1858 checks &= ~OPTION_DSN;
1860 if ( checks & OPTION_PIPE
1861 && pcre2_match(regex_PIPELINING,
1862 (PCRE2_SPTR)buf, bsize, 0, PCRE_EOPT, md, pcre_mtc_ctx) < 0)
1863 checks &= ~OPTION_PIPE;
1865 if ( checks & OPTION_SIZE
1866 && pcre2_match(regex_SIZE,
1867 (PCRE2_SPTR)buf, bsize, 0, PCRE_EOPT, md, pcre_mtc_ctx) < 0)
1868 checks &= ~OPTION_SIZE;
1870 #ifndef DISABLE_PIPE_CONNECT
1871 if ( checks & OPTION_EARLY_PIPE
1872 && pcre2_match(regex_EARLY_PIPE,
1873 (PCRE2_SPTR)buf, bsize, 0, PCRE_EOPT, md, pcre_mtc_ctx) < 0)
1875 checks &= ~OPTION_EARLY_PIPE;
1877 pcre2_match_data_free(md);
1878 /* debug_printf("%s: found 0x%04x\n", __FUNCTION__, checks); */
1884 /* Grab a string differentiating server behind a loadbalancer, for TLS
1885 resumption when such servers do not share a session-cache */
1887 static const uschar *
1888 ehlo_response_lbserver(uschar * buffer, smtp_transport_options_block * ob)
1890 #if !defined(DISABLE_TLS) && !defined(DISABLE_TLS_RESUME)
1891 /* want to make this a main-section option */
1893 uschar * save_item = iterate_item;
1895 iterate_item = buffer;
1896 s = expand_cstring(ob->host_name_extract);
1897 iterate_item = save_item;
1898 return s && !*s ? NULL : s;
1906 /* Callback for emitting a BDAT data chunk header.
1908 If given a nonzero size, first flush any buffered SMTP commands
1909 then emit the command.
1911 Reap previous SMTP command responses if requested, and always reap
1912 the response from a previous BDAT command.
1915 tctx transport context
1916 chunk_size value for SMTP BDAT command
1918 tc_chunk_last add LAST option to SMTP BDAT command
1919 tc_reap_prev reap response to previous SMTP commands
1923 DEFER TLS error on first read (EHLO-resp); errno set
1927 smtp_chunk_cmd_callback(transport_ctx * tctx, unsigned chunk_size,
1930 smtp_transport_options_block * ob = SOB tctx->tblock->options_block;
1931 smtp_context * sx = tctx->smtp_context;
1935 /* Write SMTP chunk header command. If not reaping responses, note that
1936 there may be more writes (like, the chunk data) done soon. */
1940 #ifndef DISABLE_PIPE_CONNECT
1941 BOOL new_conn = !!(sx->outblock.conn_args);
1943 if((cmd_count = smtp_write_command(sx,
1944 flags & tc_reap_prev ? SCMD_FLUSH : SCMD_MORE,
1945 "BDAT %u%s\r\n", chunk_size, flags & tc_chunk_last ? " LAST" : "")
1946 ) < 0) return ERROR;
1947 if (flags & tc_chunk_last)
1948 data_command = string_copy(big_buffer); /* Save for later error message */
1949 #ifndef DISABLE_PIPE_CONNECT
1950 /* That command write could have been the one that made the connection.
1951 Copy the fd from the client conn ctx (smtp transport specific) to the
1952 generic transport ctx. */
1955 tctx->u.fd = sx->outblock.cctx->sock;
1959 prev_cmd_count = cmd_count += sx->cmd_count;
1961 /* Reap responses for any previous, but not one we just emitted */
1965 if (sx->pending_BDAT)
1968 if (flags & tc_reap_prev && prev_cmd_count > 0)
1970 DEBUG(D_transport) debug_printf("look for %d responses"
1971 " for previous pipelined cmds\n", prev_cmd_count);
1973 switch(sync_responses(sx, prev_cmd_count, 0))
1975 case 1: /* 2xx (only) => OK */
1976 case 3: sx->good_RCPT = TRUE; /* 2xx & 5xx => OK & progress made */
1977 case 2: sx->completed_addr = TRUE; /* 5xx (only) => progress made */
1978 case 0: break; /* No 2xx or 5xx, but no probs */
1980 case -5: errno = ERRNO_TLSFAILURE;
1982 #ifndef DISABLE_PIPE_CONNECT
1983 case -4: /* non-2xx for pipelined banner or EHLO */
1985 case -1: /* Timeout on RCPT */
1986 default: return ERROR; /* I/O error, or any MAIL/DATA error */
1989 if (!sx->pending_BDAT)
1990 pipelining_active = FALSE;
1993 /* Reap response for an outstanding BDAT */
1995 if (sx->pending_BDAT)
1997 DEBUG(D_transport) debug_printf("look for one response for BDAT\n");
1999 if (!smtp_read_response(sx, sx->buffer, sizeof(sx->buffer), '2',
2000 ob->command_timeout))
2002 if (errno == 0 && sx->buffer[0] == '4')
2004 errno = ERRNO_DATA4XX; /*XXX does this actually get used? */
2005 sx->addrlist->more_errno |=
2006 ((sx->buffer[1] - '0')*10 + sx->buffer[2] - '0') << 8;
2011 sx->pending_BDAT = FALSE;
2012 pipelining_active = FALSE;
2014 else if (chunk_size > 0)
2015 sx->pending_BDAT = TRUE;
2018 sx->cmd_count = cmd_count;
2026 check_force_dane_conn(smtp_context * sx, smtp_transport_options_block * ob)
2029 if( sx->dane_required
2030 || verify_check_given_host(CUSS &ob->hosts_try_dane, sx->conn_args.host) == OK
2032 switch (rc = tlsa_lookup(sx->conn_args.host, &sx->conn_args.tlsa_dnsa, sx->dane_required))
2034 case OK: sx->conn_args.dane = TRUE;
2035 ob->tls_tempfail_tryclear = FALSE; /* force TLS */
2036 ob->tls_sni = sx->conn_args.host->name; /* force SNI */
2038 case FAIL_FORCED: break;
2039 default: set_errno_nohost(sx->addrlist, ERRNO_DNSDEFER,
2040 string_sprintf("DANE error: tlsa lookup %s",
2042 rc, FALSE, &sx->delivery_start);
2043 # ifndef DISABLE_EVENT
2044 (void) event_raise(sx->conn_args.tblock->event_action,
2045 US"dane:fail", sx->dane_required
2046 ? US"dane-required" : US"dnssec-invalid",
2056 /*************************************************
2057 * Make connection for given message *
2058 *************************************************/
2062 sx connection context
2063 suppress_tls if TRUE, don't attempt a TLS connection - this is set for
2064 a second attempt after TLS initialization fails
2066 Returns: OK - the connection was made and the delivery attempted;
2067 fd is set in the conn context, tls_out set up.
2068 DEFER - the connection could not be made, or something failed
2069 while setting up the SMTP session, or there was a
2070 non-message-specific error, such as a timeout.
2071 ERROR - helo_data or add_headers or authenticated_sender is
2072 specified for this transport, and the string failed
2076 smtp_setup_conn(smtp_context * sx, BOOL suppress_tls)
2078 smtp_transport_options_block * ob = sx->conn_args.tblock->options_block;
2079 BOOL pass_message = FALSE;
2080 uschar * message = NULL;
2083 uschar * tls_errstr;
2086 /* Many lines of clearing individual elements of *sx that used to
2087 be here have been replaced by a full memset to zero (de41aff051).
2088 There are two callers, this file and verify.c . Now we only set
2089 up nonzero elements. */
2091 sx->conn_args.ob = ob;
2093 sx->lmtp = strcmpic(ob->protocol, US"lmtp") == 0;
2094 sx->smtps = strcmpic(ob->protocol, US"smtps") == 0;
2095 sx->send_rset = TRUE;
2096 sx->send_quit = TRUE;
2097 sx->setting_up = TRUE;
2099 sx->dsn_all_lasthop = TRUE;
2102 verify_check_given_host(CUSS &ob->hosts_require_dane, sx->conn_args.host) == OK;
2105 if ((sx->max_mail = sx->conn_args.tblock->connection_max_messages) == 0) sx->max_mail = 999999;
2106 if ((sx->max_rcpt = sx->conn_args.tblock->max_addresses) == 0) sx->max_rcpt = 999999;
2107 sx->igquotstr = US"";
2108 if (!sx->helo_data) sx->helo_data = ob->helo_data;
2110 smtp_command = US"initial connection";
2112 /* Set up the buffer for reading SMTP response packets. */
2114 sx->inblock.buffer = sx->inbuffer;
2115 sx->inblock.buffersize = sizeof(sx->inbuffer);
2116 sx->inblock.ptr = sx->inbuffer;
2117 sx->inblock.ptrend = sx->inbuffer;
2119 /* Set up the buffer for holding SMTP commands while pipelining */
2121 sx->outblock.buffer = sx->outbuffer;
2122 sx->outblock.buffersize = sizeof(sx->outbuffer);
2123 sx->outblock.ptr = sx->outbuffer;
2125 /* Reset the parameters of a TLS session. */
2128 tls_out.cipher = NULL; /* the one we may use for this transport */
2129 tls_out.ourcert = NULL;
2130 tls_out.peercert = NULL;
2131 tls_out.peerdn = NULL;
2135 tls_out.ocsp = OCSP_NOT_REQ;
2136 #ifndef DISABLE_TLS_RESUME
2137 tls_out.resumption = 0;
2141 /* Flip the legacy TLS-related variables over to the outbound set in case
2142 they're used in the context of the transport. Don't bother resetting
2143 afterward (when being used by a transport) as we're in a subprocess.
2144 For verify, unflipped once the callout is dealt with */
2146 tls_modify_variables(&tls_out);
2151 set_errno_nohost(sx->addrlist, ERRNO_TLSFAILURE, US"TLS support not available",
2152 DEFER, FALSE, &sx->delivery_start);
2157 /* If we have a proxied TLS connection, check usability for this message */
2159 if (continue_hostname && continue_proxy_cipher)
2162 const uschar * sni = US"";
2164 # ifdef SUPPORT_DANE
2165 /* Check if the message will be DANE-verified; if so force TLS and its SNI */
2167 tls_out.dane_verified = FALSE;
2168 smtp_port_for_connect(sx->conn_args.host, sx->port);
2169 if ( sx->conn_args.host->dnssec == DS_YES
2170 && (rc = check_force_dane_conn(sx, ob)) != OK
2175 /* If the SNI or the DANE status required for the new message differs from the
2176 existing conn drop the connection to force a new one. */
2178 if (ob->tls_sni && !(sni = expand_cstring(ob->tls_sni)))
2179 log_write(0, LOG_MAIN|LOG_PANIC,
2180 "<%s>: failed to expand transport's tls_sni value: %s",
2181 sx->addrlist->address, expand_string_message);
2183 # ifdef SUPPORT_DANE
2184 if ( (continue_proxy_sni ? (Ustrcmp(continue_proxy_sni, sni) == 0) : !*sni)
2185 && continue_proxy_dane == sx->conn_args.dane)
2187 tls_out.sni = US sni;
2188 if ((tls_out.dane_verified = continue_proxy_dane))
2189 sx->conn_args.host->dnssec = DS_YES;
2192 if ((continue_proxy_sni ? (Ustrcmp(continue_proxy_sni, sni) == 0) : !*sni))
2193 tls_out.sni = US sni;
2198 debug_printf("Closing proxied-TLS connection due to SNI mismatch\n");
2200 smtp_debug_cmd(US"QUIT", 0);
2201 write(0, "QUIT\r\n", 6);
2203 continue_hostname = continue_proxy_cipher = NULL;
2204 f.continue_more = FALSE;
2205 continue_sequence = 1; /* Unfortunately, this process cannot affect success log
2206 which is done by delivery proc. Would have to pass this
2207 back through reporting pipe. */
2210 #endif /*!DISABLE_TLS*/
2212 /* Make a connection to the host if this isn't a continued delivery, and handle
2213 the initial interaction and HELO/EHLO/LHLO. Connect timeout errors are handled
2214 specially so they can be identified for retries. */
2216 if (!continue_hostname)
2219 HDEBUG(D_verify) debug_printf("interface=%s port=%d\n", sx->conn_args.interface, sx->port);
2221 /* Arrange to report to calling process this is a new connection */
2223 clearflag(sx->first_addr, af_cont_conn);
2224 setflag(sx->first_addr, af_new_conn);
2226 /* Get the actual port the connection will use, into sx->conn_args.host */
2228 smtp_port_for_connect(sx->conn_args.host, sx->port);
2231 /* Do TLSA lookup for DANE */
2233 tls_out.dane_verified = FALSE;
2234 tls_out.tlsa_usage = 0;
2236 if (sx->conn_args.host->dnssec == DS_YES)
2239 if ((rc = check_force_dane_conn(sx, ob)) != OK)
2242 else if (sx->dane_required)
2244 set_errno_nohost(sx->addrlist, ERRNO_DNSDEFER,
2245 string_sprintf("DANE error: %s lookup not DNSSEC", sx->conn_args.host->name),
2246 FAIL, FALSE, &sx->delivery_start);
2247 # ifndef DISABLE_EVENT
2248 (void) event_raise(sx->conn_args.tblock->event_action,
2249 US"dane:fail", US"dane-required", NULL);
2256 /* Make the TCP connection */
2258 sx->cctx.tls_ctx = NULL;
2259 sx->inblock.cctx = sx->outblock.cctx = &sx->cctx;
2260 #ifdef EXPERIMENTAL_ESMTP_LIMITS
2261 sx->peer_limit_mail = sx->peer_limit_rcpt = sx->peer_limit_rcptdom =
2263 sx->avoid_option = sx->peer_offered = smtp_peer_options = 0;
2264 #ifndef DISABLE_CLIENT_CMD_LOG
2265 client_cmd_log = NULL;
2268 #ifndef DISABLE_PIPE_CONNECT
2269 if ( verify_check_given_host(CUSS &ob->hosts_pipe_connect,
2270 sx->conn_args.host) == OK)
2272 /* We don't find out the local ip address until the connect, so if
2273 the helo string might use it avoid doing early-pipelining. */
2276 || sx->conn_args.interface
2277 || !Ustrstr(sx->helo_data, "$sending_ip_address")
2278 || Ustrstr(sx->helo_data, "def:sending_ip_address")
2281 sx->early_pipe_ok = TRUE;
2282 if ( read_ehlo_cache_entry(sx)
2283 && sx->ehlo_resp.cleartext_features & OPTION_EARLY_PIPE)
2286 debug_printf("Using cached cleartext PIPECONNECT\n");
2287 sx->early_pipe_active = TRUE;
2288 sx->peer_offered = sx->ehlo_resp.cleartext_features;
2291 else DEBUG(D_transport)
2292 debug_printf("helo needs $sending_ip_address; avoid early-pipelining\n");
2295 if (sx->early_pipe_active)
2297 sx->outblock.conn_args = &sx->conn_args;
2298 (void) smtp_boundsock(&sx->conn_args);
2303 blob lazy_conn = {.data = NULL};
2304 /* For TLS-connect, a TFO lazy-connect is useful since the Client Hello
2305 can go on the TCP SYN. */
2307 if ((sx->cctx.sock = smtp_connect(&sx->conn_args,
2308 sx->smtps ? &lazy_conn : NULL)) < 0)
2310 set_errno_nohost(sx->addrlist,
2311 errno == ETIMEDOUT ? ERRNO_CONNECTTIMEOUT : errno,
2312 sx->verify ? US strerror(errno) : NULL,
2313 DEFER, FALSE, &sx->delivery_start);
2314 sx->send_quit = FALSE;
2318 (void) setsockopt(sx->cctx.sock, IPPROTO_TCP, TCP_QUICKACK, US &off,
2322 /* Expand the greeting message while waiting for the initial response. (Makes
2323 sense if helo_data contains ${lookup dnsdb ...} stuff). The expansion is
2324 delayed till here so that $sending_ip_address and $sending_port are set.
2325 Those will be known even for a TFO lazy-connect, having been set by the bind().
2326 For early-pipe, we are ok if binding to a local interface; otherwise (if
2327 $sending_ip_address is seen in helo_data) we disabled early-pipe above. */
2330 if (!(sx->helo_data = expand_string(sx->helo_data)))
2332 log_write(0, LOG_MAIN|LOG_PANIC,
2333 "<%s>: failed to expand transport's helo_data value for callout: %s",
2334 sx->addrlist->address, expand_string_message);
2339 expand_string_message = NULL;
2340 if ((sx->helo_data = string_domain_utf8_to_alabel(sx->helo_data,
2341 &expand_string_message)),
2342 expand_string_message)
2344 log_write(0, LOG_MAIN|LOG_PANIC,
2345 "<%s>: failed to expand transport's helo_data value for callout: %s",
2346 sx->addrlist->address, expand_string_message);
2348 sx->helo_data = NULL;
2352 /* The first thing is to wait for an initial OK response. The dreaded "goto"
2353 is nevertheless a reasonably clean way of programming this kind of logic,
2354 where you want to escape on any error. */
2358 #ifndef DISABLE_PIPE_CONNECT
2359 if (sx->early_pipe_active)
2361 sx->pending_BANNER = TRUE; /* sync_responses() must eventually handle */
2362 sx->outblock.cmd_count = 1;
2367 if (!smtp_reap_banner(sx))
2368 goto RESPONSE_FAILED;
2371 #ifndef DISABLE_EVENT
2374 lookup_dnssec_authenticated = sx->conn_args.host->dnssec==DS_YES ? US"yes"
2375 : sx->conn_args.host->dnssec==DS_NO ? US"no" : NULL;
2376 s = event_raise(sx->conn_args.tblock->event_action, US"smtp:connect", sx->buffer, NULL);
2379 set_errno_nohost(sx->addrlist, ERRNO_EXPANDFAIL,
2380 string_sprintf("deferred by smtp:connect event expansion: %s", s),
2381 DEFER, FALSE, &sx->delivery_start);
2388 /* Now check if the helo_data expansion went well, and sign off cleanly if
2393 message = string_sprintf("failed to expand helo_data: %s",
2394 expand_string_message);
2395 set_errno_nohost(sx->addrlist, ERRNO_EXPANDFAIL, message, DEFER, FALSE, &sx->delivery_start);
2401 /** Debugging without sending a message
2402 sx->addrlist->transport_return = DEFER;
2406 /* Errors that occur after this point follow an SMTP command, which is
2407 left in big_buffer by smtp_write_command() for use in error messages. */
2409 smtp_command = big_buffer;
2411 /* Tell the remote who we are...
2413 February 1998: A convention has evolved that ESMTP-speaking MTAs include the
2414 string "ESMTP" in their greeting lines, so make Exim send EHLO if the
2415 greeting is of this form. The assumption was that the far end supports it
2416 properly... but experience shows that there are some that give 5xx responses,
2417 even though the banner includes "ESMTP" (there's a bloody-minded one that
2418 says "ESMTP not spoken here"). Cope with that case.
2420 September 2000: Time has passed, and it seems reasonable now to always send
2421 EHLO at the start. It is also convenient to make the change while installing
2424 July 2003: Joachim Wieland met a broken server that advertises "PIPELINING"
2425 but times out after sending MAIL FROM, RCPT TO and DATA all together. There
2426 would be no way to send out the mails, so there is now a host list
2427 "hosts_avoid_esmtp" that disables ESMTP for special hosts and solves the
2428 PIPELINING problem as well. Maybe it can also be useful to cure other
2429 problems with broken servers.
2431 Exim originally sent "Helo" at this point and ran for nearly a year that way.
2432 Then somebody tried it with a Microsoft mailer... It seems that all other
2433 mailers use upper case for some reason (the RFC is quite clear about case
2434 independence) so, for peace of mind, I gave in. */
2436 sx->esmtp = verify_check_given_host(CUSS &ob->hosts_avoid_esmtp, sx->conn_args.host) != OK;
2438 /* Alas; be careful, since this goto is not an error-out, so conceivably
2439 we might set data between here and the target which we assume to exist
2440 and be usable. I can see this coming back to bite us. */
2444 smtp_peer_options |= OPTION_TLS;
2445 suppress_tls = FALSE;
2446 ob->tls_tempfail_tryclear = FALSE;
2447 smtp_command = US"SSL-on-connect";
2454 if (smtp_write_command(sx,
2455 #ifndef DISABLE_PIPE_CONNECT
2456 sx->early_pipe_active ? SCMD_BUFFER :
2459 "%s %s\r\n", sx->lmtp ? "LHLO" : "EHLO", sx->helo_data) < 0)
2461 sx->esmtp_sent = TRUE;
2463 #ifndef DISABLE_PIPE_CONNECT
2464 if (sx->early_pipe_active)
2466 sx->pending_EHLO = TRUE;
2468 /* If we have too many authenticators to handle and might need to AUTH
2469 for this transport, pipeline no further as we will need the
2470 list of auth methods offered. Reap the banner and EHLO. */
2472 if ( (ob->hosts_require_auth || ob->hosts_try_auth)
2473 && f.smtp_in_early_pipe_no_auth)
2475 DEBUG(D_transport) debug_printf("may need to auth, so pipeline no further\n");
2476 if (smtp_write_command(sx, SCMD_FLUSH, NULL) < 0)
2478 if (sync_responses(sx, 2, 0) != 0)
2481 debug_printf("failed reaping pipelined cmd responses\n");
2482 goto RESPONSE_FAILED;
2484 sx->early_pipe_active = FALSE;
2489 if (!smtp_reap_ehlo(sx))
2490 goto RESPONSE_FAILED;
2494 debug_printf("not sending EHLO (host matches hosts_avoid_esmtp)\n");
2496 #ifndef DISABLE_PIPE_CONNECT
2497 if (!sx->early_pipe_active)
2502 int n = sizeof(sx->buffer);
2503 uschar * rsp = sx->buffer;
2505 if (sx->esmtp_sent && (n = Ustrlen(sx->buffer) + 1) < sizeof(sx->buffer)/2)
2506 { rsp = sx->buffer + n; n = sizeof(sx->buffer) - n; }
2508 if (smtp_write_command(sx, SCMD_FLUSH, "HELO %s\r\n", sx->helo_data) < 0)
2510 good_response = smtp_read_response(sx, rsp, n, '2', ob->command_timeout);
2511 #ifdef EXPERIMENTAL_DSN_INFO
2512 sx->helo_response = string_copy(rsp);
2516 /* Handle special logging for a closed connection after HELO
2517 when had previously sent EHLO */
2519 if (rsp != sx->buffer && rsp[0] == 0 && (errno == 0 || errno == ECONNRESET))
2521 errno = ERRNO_SMTPCLOSED;
2522 goto EHLOHELO_FAILED;
2524 memmove(sx->buffer, rsp, Ustrlen(rsp));
2525 goto RESPONSE_FAILED;
2529 if (sx->esmtp || sx->lmtp)
2531 #ifndef DISABLE_PIPE_CONNECT
2532 if (!sx->early_pipe_active)
2535 sx->peer_offered = ehlo_response(sx->buffer,
2536 OPTION_TLS /* others checked later */
2537 #ifndef DISABLE_PIPE_CONNECT
2538 | (sx->early_pipe_ok
2540 | OPTION_CHUNKING | OPTION_PRDR | OPTION_DSN | OPTION_PIPE | OPTION_SIZE
2548 /*XXX RESUMP - sx->buffer has the EHLO-resp, but only if not early-pipe and not continued-connection */
2549 /* maybe disable resump on cont? */
2551 #ifdef EXPERIMENTAL_ESMTP_LIMITS
2552 if (tls_out.active.sock >= 0 || !(sx->peer_offered & OPTION_TLS))
2554 ehlo_response_limits_read(sx);
2555 ehlo_response_limits_apply(sx);
2558 #ifndef DISABLE_PIPE_CONNECT
2559 if (sx->early_pipe_ok)
2561 sx->ehlo_resp.cleartext_features = sx->peer_offered;
2563 if ( (sx->peer_offered & (OPTION_PIPE | OPTION_EARLY_PIPE))
2564 == (OPTION_PIPE | OPTION_EARLY_PIPE))
2566 DEBUG(D_transport) debug_printf("PIPECONNECT usable in future for this IP\n");
2567 sx->ehlo_resp.cleartext_auths = study_ehlo_auths(sx);
2568 write_ehlo_cache_entry(sx);
2572 sx->conn_args.host_lbserver = ehlo_response_lbserver(sx->buffer, ob);
2575 /* Set tls_offered if the response to EHLO specifies support for STARTTLS. */
2578 smtp_peer_options |= sx->peer_offered & OPTION_TLS;
2583 /* For continuing deliveries down the same channel, having re-exec'd the socket
2584 is the standard input; for a socket held open from verify it is recorded
2585 in the cutthrough context block. Either way we don't need to redo EHLO here
2586 (but may need to do so for TLS - see below).
2587 Set up the pointer to where subsequent commands will be left, for
2588 error messages. Note that smtp_peer_options will have been
2589 set from the command line if they were set in the process that passed the
2592 /*XXX continue case needs to propagate DSN_INFO, prob. in deliver.c
2593 as the continue goes via transport_pass_socket() and doublefork and exec.
2594 It does not wait. Unclear how we keep separate host's responses
2595 separate - we could match up by host ip+port as a bodge. */
2599 if (cutthrough.cctx.sock >= 0 && cutthrough.callout_hold_only)
2601 sx->cctx = cutthrough.cctx;
2602 sx->conn_args.host->port = sx->port = cutthrough.host.port;
2606 sx->cctx.sock = 0; /* stdin */
2607 sx->cctx.tls_ctx = NULL;
2608 smtp_port_for_connect(sx->conn_args.host, sx->port); /* Record the port that was used */
2610 sx->inblock.cctx = sx->outblock.cctx = &sx->cctx;
2611 smtp_command = big_buffer;
2612 sx->peer_offered = smtp_peer_options;
2613 #ifdef EXPERIMENTAL_ESMTP_LIMITS
2614 /* Limits passed by cmdline over exec. */
2615 ehlo_limits_apply(sx,
2616 sx->peer_limit_mail = continue_limit_mail,
2617 sx->peer_limit_rcpt = continue_limit_rcpt,
2618 sx->peer_limit_rcptdom = continue_limit_rcptdom);
2620 sx->helo_data = NULL; /* ensure we re-expand ob->helo_data */
2622 /* For a continued connection with TLS being proxied for us, or a
2623 held-open verify connection with TLS, nothing more to do. */
2625 if ( continue_proxy_cipher
2626 || (cutthrough.cctx.sock >= 0 && cutthrough.callout_hold_only
2627 && cutthrough.is_tls)
2630 sx->pipelining_used = pipelining_active = !!(smtp_peer_options & OPTION_PIPE);
2631 HDEBUG(D_transport) debug_printf("continued connection, %s TLS\n",
2632 continue_proxy_cipher ? "proxied" : "verify conn with");
2635 HDEBUG(D_transport) debug_printf("continued connection, no TLS\n");
2638 /* If TLS is available on this connection, whether continued or not, attempt to
2639 start up a TLS session, unless the host is in hosts_avoid_tls. If successful,
2640 send another EHLO - the server may give a different answer in secure mode. We
2641 use a separate buffer for reading the response to STARTTLS so that if it is
2642 negative, the original EHLO data is available for subsequent analysis, should
2643 the client not be required to use TLS. If the response is bad, copy the buffer
2644 for error analysis. */
2647 if ( smtp_peer_options & OPTION_TLS
2649 && verify_check_given_host(CUSS &ob->hosts_avoid_tls, sx->conn_args.host) != OK
2651 || verify_check_given_host(CUSS &ob->hosts_verify_avoid_tls, sx->conn_args.host) != OK
2654 uschar buffer2[4096];
2656 if (smtp_write_command(sx, SCMD_FLUSH, "STARTTLS\r\n") < 0)
2659 #ifndef DISABLE_PIPE_CONNECT
2660 /* If doing early-pipelining reap the banner and EHLO-response but leave
2661 the response for the STARTTLS we just sent alone. On fail, assume wrong
2662 cached capability and retry with the pipelining disabled. */
2664 if (sx->early_pipe_active)
2666 if (sync_responses(sx, 2, 0) != 0)
2669 debug_printf("failed reaping pipelined cmd responses\n");
2670 close(sx->cctx.sock);
2672 sx->early_pipe_active = FALSE;
2673 goto PIPE_CONNECT_RETRY;
2675 /*XXX RESUMP - does this leave the EHLO-resp anywhere? Yes, sx->buffer */
2676 sx->conn_args.host_lbserver = ehlo_response_lbserver(sx->buffer, ob);
2680 /* If there is an I/O error, transmission of this message is deferred. If
2681 there is a temporary rejection of STARRTLS and tls_tempfail_tryclear is
2682 false, we also defer. However, if there is a temporary rejection of STARTTLS
2683 and tls_tempfail_tryclear is true, or if there is an outright rejection of
2684 STARTTLS, we carry on. This means we will try to send the message in clear,
2685 unless the host is in hosts_require_tls (tested below). */
2687 if (!smtp_read_response(sx, buffer2, sizeof(buffer2), '2', ob->command_timeout))
2691 || (buffer2[0] == '4' && !ob->tls_tempfail_tryclear)
2694 Ustrncpy(sx->buffer, buffer2, sizeof(sx->buffer));
2695 sx->buffer[sizeof(sx->buffer)-1] = '\0';
2696 goto RESPONSE_FAILED;
2700 /* STARTTLS accepted: try to negotiate a TLS session. */
2705 sx->conn_args.sending_ip_address = sending_ip_address;
2706 /*XXX RESUMP want LB-server info here */
2707 if (!tls_client_start(&sx->cctx, &sx->conn_args, sx->addrlist, &tls_out, &tls_errstr))
2709 /* TLS negotiation failed; give an error. From outside, this function may
2710 be called again to try in clear on a new connection, if the options permit
2711 it for this host. */
2713 DEBUG(D_tls) debug_printf("TLS session fail: %s\n", tls_errstr);
2715 # ifdef SUPPORT_DANE
2716 if (sx->conn_args.dane)
2718 log_write(0, LOG_MAIN,
2719 "DANE attempt failed; TLS connection to %s [%s]: %s",
2720 sx->conn_args.host->name, sx->conn_args.host->address, tls_errstr);
2721 # ifndef DISABLE_EVENT
2722 (void) event_raise(sx->conn_args.tblock->event_action,
2723 US"dane:fail", US"validation-failure", NULL); /* could do with better detail */
2728 errno = ERRNO_TLSFAILURE;
2729 message = string_sprintf("TLS session: %s", tls_errstr);
2730 sx->send_quit = FALSE;
2733 sx->send_tlsclose = TRUE;
2735 /* TLS session is set up. Check the inblock fill level. If there is
2736 content then as we have not yet done a tls read it must have arrived before
2737 the TLS handshake, in-clear. That violates the sync requirement of the
2738 STARTTLS RFC, so fail. */
2740 if (sx->inblock.ptr != sx->inblock.ptrend)
2744 int i = sx->inblock.ptrend - sx->inblock.ptr;
2745 debug_printf("unused data in input buffer after ack for STARTTLS:\n"
2747 i > 100 ? 100 : i, sx->inblock.ptr, i > 100 ? "..." : "");
2749 tls_errstr = US"synch error before connect";
2750 goto TLS_CONN_FAILED;
2753 smtp_peer_options_wrap = smtp_peer_options;
2754 for (address_item * addr = sx->addrlist; addr; addr = addr->next)
2755 if (addr->transport_return == PENDING_DEFER)
2757 addr->cipher = tls_out.cipher;
2758 addr->ourcert = tls_out.ourcert;
2759 addr->peercert = tls_out.peercert;
2760 addr->peerdn = tls_out.peerdn;
2761 addr->ocsp = tls_out.ocsp;
2762 addr->tlsver = tls_out.ver;
2767 /* if smtps, we'll have smtp_command set to something else; always safe to
2769 smtp_command = big_buffer;
2771 /* If we started TLS, redo the EHLO/LHLO exchange over the secure channel. If
2772 helo_data is null, we are dealing with a connection that was passed from
2773 another process, and so we won't have expanded helo_data above. We have to
2774 expand it here. $sending_ip_address and $sending_port are set up right at the
2775 start of the Exim process (in exim.c). */
2777 if (tls_out.active.sock >= 0)
2779 uschar * greeting_cmd;
2781 if (!sx->helo_data && !(sx->helo_data = expand_string(ob->helo_data)))
2783 uschar *message = string_sprintf("failed to expand helo_data: %s",
2784 expand_string_message);
2785 set_errno_nohost(sx->addrlist, ERRNO_EXPANDFAIL, message, DEFER, FALSE, &sx->delivery_start);
2790 #ifndef DISABLE_PIPE_CONNECT
2791 /* For SMTPS there is no cleartext early-pipe; use the crypted permission bit.
2792 We're unlikely to get the group sent and delivered before the server sends its
2793 banner, but it's still worth sending as a group.
2794 For STARTTLS allow for cleartext early-pipe but no crypted early-pipe, but not
2797 if (sx->smtps ? sx->early_pipe_ok : sx->early_pipe_active)
2799 sx->peer_offered = sx->ehlo_resp.crypted_features;
2800 if ((sx->early_pipe_active =
2801 !!(sx->ehlo_resp.crypted_features & OPTION_EARLY_PIPE)))
2802 DEBUG(D_transport) debug_printf("Using cached crypted PIPECONNECT\n");
2805 #ifdef EXPERIMMENTAL_ESMTP_LIMITS
2806 /* As we are about to send another EHLO, forget any LIMITS received so far. */
2807 sx->peer_limit_mail = sx->peer_limit_rcpt = sx->peer_limit_rcptdom = 0;
2808 if ((sx->max_mail = sx->conn_args.tblock->connection_max_message) == 0) sx->max_mail = 999999;
2809 if ((sx->max_rcpt = sx->conn_args.tblock->max_addresses) == 0) sx->max_rcpt = 999999;
2810 sx->single_rcpt_domain = FALSE;
2813 /* For SMTPS we need to wait for the initial OK response. */
2815 #ifndef DISABLE_PIPE_CONNECT
2816 if (sx->early_pipe_active)
2818 sx->pending_BANNER = TRUE;
2819 sx->outblock.cmd_count = 1;
2823 if (!smtp_reap_banner(sx))
2824 goto RESPONSE_FAILED;
2827 greeting_cmd = US"LHLO";
2829 greeting_cmd = US"EHLO";
2832 greeting_cmd = US"HELO";
2834 debug_printf("not sending EHLO (host matches hosts_avoid_esmtp)\n");
2837 if (smtp_write_command(sx,
2838 #ifndef DISABLE_PIPE_CONNECT
2839 sx->early_pipe_active ? SCMD_BUFFER :
2842 "%s %s\r\n", greeting_cmd, sx->helo_data) < 0)
2845 #ifndef DISABLE_PIPE_CONNECT
2846 if (sx->early_pipe_active)
2847 sx->pending_EHLO = TRUE;
2851 if (!smtp_reap_ehlo(sx))
2854 /* The GnuTLS layer in Exim only spots a server-rejection of a client
2855 cert late, under TLS1.3 - which means here; the first time we try to
2856 receive crypted data. Treat it as if it was a connect-time failure.
2857 See also the early-pipe equivalent... which will be hard; every call
2858 to sync_responses will need to check the result.
2859 It would be nicer to have GnuTLS check the cert during the handshake.
2860 Can it do that, with all the flexibility we need? */
2862 tls_errstr = US"error on first read";
2863 goto TLS_CONN_FAILED;
2866 goto RESPONSE_FAILED;
2868 smtp_peer_options = 0;
2872 /* If the host is required to use a secure channel, ensure that we
2876 # ifdef SUPPORT_DANE
2877 || sx->conn_args.dane
2879 || verify_check_given_host(CUSS &ob->hosts_require_tls, sx->conn_args.host) == OK
2882 errno = ERRNO_TLSREQUIRED;
2883 message = string_sprintf("a TLS session is required, but %s",
2884 smtp_peer_options & OPTION_TLS
2885 ? "an attempt to start TLS failed" : "the server did not offer TLS support");
2886 # if defined(SUPPORT_DANE) && !defined(DISABLE_EVENT)
2887 if (sx->conn_args.dane)
2888 (void) event_raise(sx->conn_args.tblock->event_action, US"dane:fail",
2889 smtp_peer_options & OPTION_TLS
2890 ? US"validation-failure" /* could do with better detail */
2891 : US"starttls-not-supported",
2896 #endif /*DISABLE_TLS*/
2898 /* If TLS is active, we have just started it up and re-done the EHLO command,
2899 so its response needs to be analyzed. If TLS is not active and this is a
2900 continued session down a previously-used socket, we haven't just done EHLO, so
2903 if ( !continue_hostname
2905 || tls_out.active.sock >= 0
2909 if (sx->esmtp || sx->lmtp)
2911 #ifndef DISABLE_PIPE_CONNECT
2912 if (!sx->early_pipe_active)
2915 sx->peer_offered = ehlo_response(sx->buffer,
2917 #ifndef DISABLE_PIPE_CONNECT
2918 | (sx->lmtp && ob->lmtp_ignore_quota ? OPTION_IGNQ : 0)
2919 | OPTION_DSN | OPTION_PIPE | OPTION_SIZE
2920 | OPTION_CHUNKING | OPTION_PRDR | OPTION_UTF8
2921 | (tls_out.active.sock >= 0 ? OPTION_EARLY_PIPE : 0) /* not for lmtp */
2925 | (sx->lmtp && ob->lmtp_ignore_quota ? OPTION_IGNQ : 0)
2928 # ifdef SUPPORT_I18N
2929 | (sx->addrlist->prop.utf8_msg ? OPTION_UTF8 : 0)
2930 /*XXX if we hand peercaps on to continued-conn processes,
2931 must not depend on this addr */
2935 | (ob->size_addition >= 0 ? OPTION_SIZE : 0)
2938 #ifndef DISABLE_PIPE_CONNECT
2939 if (tls_out.active.sock >= 0)
2940 sx->ehlo_resp.crypted_features = sx->peer_offered;
2943 #ifdef EXPERIMENTAL_ESMTP_LIMITS
2944 if (tls_out.active.sock >= 0 || !(sx->peer_offered & OPTION_TLS))
2946 ehlo_response_limits_read(sx);
2947 ehlo_response_limits_apply(sx);
2952 /* Set for IGNOREQUOTA if the response to LHLO specifies support and the
2953 lmtp_ignore_quota option was set. */
2955 sx->igquotstr = sx->peer_offered & OPTION_IGNQ ? US" IGNOREQUOTA" : US"";
2957 /* If the response to EHLO specified support for the SIZE parameter, note
2958 this, provided size_addition is non-negative. */
2960 smtp_peer_options |= sx->peer_offered & OPTION_SIZE;
2962 /* Note whether the server supports PIPELINING. If hosts_avoid_esmtp matched
2963 the current host, esmtp will be false, so PIPELINING can never be used. If
2964 the current host matches hosts_avoid_pipelining, don't do it. */
2966 if ( sx->peer_offered & OPTION_PIPE
2967 && verify_check_given_host(CUSS &ob->hosts_avoid_pipelining, sx->conn_args.host) != OK)
2968 smtp_peer_options |= OPTION_PIPE;
2970 DEBUG(D_transport) debug_printf("%susing PIPELINING\n",
2971 smtp_peer_options & OPTION_PIPE ? "" : "not ");
2973 if ( sx->peer_offered & OPTION_CHUNKING
2974 && verify_check_given_host(CUSS &ob->hosts_try_chunking, sx->conn_args.host) == OK)
2975 smtp_peer_options |= OPTION_CHUNKING;
2977 if (smtp_peer_options & OPTION_CHUNKING)
2978 DEBUG(D_transport) debug_printf("CHUNKING usable\n");
2980 #ifndef DISABLE_PRDR
2981 if ( sx->peer_offered & OPTION_PRDR
2982 && verify_check_given_host(CUSS &ob->hosts_try_prdr, sx->conn_args.host) == OK)
2983 smtp_peer_options |= OPTION_PRDR;
2985 if (smtp_peer_options & OPTION_PRDR)
2986 DEBUG(D_transport) debug_printf("PRDR usable\n");
2989 /* Note if the server supports DSN */
2990 smtp_peer_options |= sx->peer_offered & OPTION_DSN;
2991 DEBUG(D_transport) debug_printf("%susing DSN\n",
2992 sx->peer_offered & OPTION_DSN ? "" : "not ");
2994 #ifndef DISABLE_PIPE_CONNECT
2995 if ( sx->early_pipe_ok
2996 && !sx->early_pipe_active
2997 && tls_out.active.sock >= 0
2998 && smtp_peer_options & OPTION_PIPE
2999 && ( sx->ehlo_resp.cleartext_features | sx->ehlo_resp.crypted_features)
3000 & OPTION_EARLY_PIPE)
3002 DEBUG(D_transport) debug_printf("PIPECONNECT usable in future for this IP\n");
3003 sx->ehlo_resp.crypted_auths = study_ehlo_auths(sx);
3004 write_ehlo_cache_entry(sx);
3008 /* Note if the response to EHLO specifies support for the AUTH extension.
3009 If it has, check that this host is one we want to authenticate to, and do
3010 the business. The host name and address must be available when the
3011 authenticator's client driver is running. */
3013 switch (yield = smtp_auth(sx))
3015 default: goto SEND_QUIT;
3017 case FAIL_SEND: goto SEND_FAILED;
3018 case FAIL: goto RESPONSE_FAILED;
3022 sx->pipelining_used = pipelining_active = !!(smtp_peer_options & OPTION_PIPE);
3024 /* The setting up of the SMTP call is now complete. Any subsequent errors are
3025 message-specific. */
3027 sx->setting_up = FALSE;
3030 if (sx->addrlist->prop.utf8_msg)
3034 /* If the transport sets a downconversion mode it overrides any set by ACL
3037 if ((s = ob->utf8_downconvert))
3039 if (!(s = expand_string(s)))
3041 message = string_sprintf("failed to expand utf8_downconvert: %s",
3042 expand_string_message);
3043 set_errno_nohost(sx->addrlist, ERRNO_EXPANDFAIL, message, DEFER, FALSE, &sx->delivery_start);
3049 case '1': sx->addrlist->prop.utf8_downcvt = TRUE;
3050 sx->addrlist->prop.utf8_downcvt_maybe = FALSE;
3052 case '0': sx->addrlist->prop.utf8_downcvt = FALSE;
3053 sx->addrlist->prop.utf8_downcvt_maybe = FALSE;
3055 case '-': if (s[1] == '1')
3057 sx->addrlist->prop.utf8_downcvt = FALSE;
3058 sx->addrlist->prop.utf8_downcvt_maybe = TRUE;
3064 sx->utf8_needed = !sx->addrlist->prop.utf8_downcvt
3065 && !sx->addrlist->prop.utf8_downcvt_maybe;
3066 DEBUG(D_transport) if (!sx->utf8_needed)
3067 debug_printf("utf8: %s downconvert\n",
3068 sx->addrlist->prop.utf8_downcvt ? "mandatory" : "optional");
3071 /* If this is an international message we need the host to speak SMTPUTF8 */
3072 if (sx->utf8_needed && !(sx->peer_offered & OPTION_UTF8))
3074 errno = ERRNO_UTF8_FWD;
3075 goto RESPONSE_FAILED;
3077 #endif /*SUPPORT_I18N*/
3086 if (errno == ECONNREFUSED) /* first-read error on a TFO conn */
3088 /* There is a testing facility for simulating a connection timeout, as I
3089 can't think of any other way of doing this. It converts a connection
3090 refused into a timeout if the timeout is set to 999999. This is done for
3091 a 3whs connection in ip_connect(), but a TFO connection does not error
3092 there - instead it gets ECONNREFUSED on the first data read. Tracking
3093 that a TFO really was done is too hard, or we would set a
3094 sx->pending_conn_done bit and test that in smtp_reap_banner() and
3095 smtp_reap_ehlo(). That would let us also add the conn-timeout to the
3098 if (f.running_in_test_harness && ob->connect_timeout == 999999)
3100 set_errno_nohost(sx->addrlist,
3101 errno == ETIMEDOUT ? ERRNO_CONNECTTIMEOUT : errno,
3102 sx->verify ? US strerror(errno) : NULL,
3103 DEFER, FALSE, &sx->delivery_start);
3104 sx->send_quit = FALSE;
3108 /* really an error on an SMTP read */
3110 sx->send_quit = check_response(sx->conn_args.host, &errno, sx->addrlist->more_errno,
3111 sx->buffer, &code, &message, &pass_message);
3117 message = US string_sprintf("smtp send to %s [%s] failed: %s",
3118 sx->conn_args.host->name, sx->conn_args.host->address, strerror(errno));
3119 sx->send_quit = FALSE;
3125 message = string_sprintf("Remote host closed connection in response to %s"
3126 " (EHLO response was: %s)", smtp_command, sx->buffer);
3127 sx->send_quit = FALSE;
3131 /* This label is jumped to directly when a TLS negotiation has failed,
3132 or was not done for a host for which it is required. Values will be set
3133 in message and errno, and setting_up will always be true. Treat as
3134 a temporary error. */
3138 code = '4', yield = DEFER;
3142 /* The failure happened while setting up the call; see if the failure was
3143 a 5xx response (this will either be on connection, or following HELO - a 5xx
3144 after EHLO causes it to try HELO). If so, and there are no more hosts to try,
3145 fail all addresses, as this host is never going to accept them. For other
3146 errors during setting up (timeouts or whatever), defer all addresses, and
3147 yield DEFER, so that the host is not tried again for a while.
3149 XXX This peeking for another host feels like a layering violation. We want
3150 to note the host as unusable, but down here we shouldn't know if this was
3151 the last host to try for the addr(list). Perhaps the upper layer should be
3152 the one to do set_errno() ? The problem is that currently the addr is where
3153 errno etc. are stashed, but until we run out of hosts to try the errors are
3154 host-specific. Maybe we should enhance the host_item definition? */
3157 sx->ok = FALSE; /* For when reached by GOTO */
3158 set_errno(sx->addrlist, errno, message,
3159 sx->conn_args.host->next
3163 || errno == ERRNO_UTF8_FWD
3167 errno == ECONNREFUSED ? NULL : sx->conn_args.host,
3168 #ifdef EXPERIMENTAL_DSN_INFO
3169 sx->smtp_greeting, sx->helo_response,
3171 &sx->delivery_start);
3178 (void)smtp_write_command(sx, SCMD_FLUSH, "QUIT\r\n");
3181 if (sx->cctx.tls_ctx)
3183 if (sx->send_tlsclose)
3185 tls_close(sx->cctx.tls_ctx, TLS_SHUTDOWN_NOWAIT);
3186 sx->send_tlsclose = FALSE;
3188 sx->cctx.tls_ctx = NULL;
3192 /* Close the socket, and return the appropriate value, first setting
3193 works because the NULL setting is passed back to the calling process, and
3194 remote_max_parallel is forced to 1 when delivering over an existing connection,
3197 HDEBUG(D_transport|D_acl|D_v) debug_printf_indent(" SMTP(close)>>\n");
3200 shutdown(sx->cctx.sock, SHUT_WR);
3201 if (fcntl(sx->cctx.sock, F_SETFL, O_NONBLOCK) == 0)
3202 for (int i = 16; read(sx->cctx.sock, sx->inbuffer, sizeof(sx->inbuffer)) > 0 && i > 0;)
3203 i--; /* drain socket */
3204 sx->send_quit = FALSE;
3206 (void)close(sx->cctx.sock);
3209 #ifndef DISABLE_EVENT
3210 (void) event_raise(sx->conn_args.tblock->event_action, US"tcp:close", NULL, NULL);
3213 smtp_debug_cmd_report();
3214 continue_transport = NULL;
3215 continue_hostname = NULL;
3222 /* Create the string of options that will be appended to the MAIL FROM:
3223 in the connection context buffer */
3226 build_mailcmd_options(smtp_context * sx, address_item * addrlist)
3228 uschar * p = sx->buffer;
3229 address_item * addr;
3234 /* If we know the receiving MTA supports the SIZE qualification, and we know it,
3235 send it, adding something to the message size to allow for imprecision
3236 and things that get added en route. Exim keeps the number of lines
3237 in a message, so we can give an accurate value for the original message, but we
3238 need some additional to handle added headers. (Double "." characters don't get
3239 included in the count.) */
3241 if ( message_size > 0
3242 && sx->peer_offered & OPTION_SIZE && !(sx->avoid_option & OPTION_SIZE))
3244 /*XXX problem here under spool_files_wireformat?
3245 Or just forget about lines? Or inflate by a fixed proportion? */
3247 sprintf(CS p, " SIZE=%d", message_size+message_linecount+(SOB sx->conn_args.ob)->size_addition);
3251 #ifndef DISABLE_PRDR
3252 /* If it supports Per-Recipient Data Responses, and we have more than one recipient,
3255 sx->prdr_active = FALSE;
3256 if (smtp_peer_options & OPTION_PRDR)
3257 for (address_item * addr = addrlist; addr; addr = addr->next)
3258 if (addr->transport_return == PENDING_DEFER)
3260 for (addr = addr->next; addr; addr = addr->next)
3261 if (addr->transport_return == PENDING_DEFER)
3262 { /* at least two recipients to send */
3263 sx->prdr_active = TRUE;
3264 sprintf(CS p, " PRDR"); p += 5;
3272 /* If it supports internationalised messages, and this meesage need that,
3275 if ( sx->peer_offered & OPTION_UTF8
3276 && addrlist->prop.utf8_msg
3277 && !addrlist->prop.utf8_downcvt
3279 Ustrcpy(p, US" SMTPUTF8"), p += 9;
3282 /* check if all addresses have DSN-lasthop flag; do not send RET and ENVID if so */
3283 for (sx->dsn_all_lasthop = TRUE, addr = addrlist, address_count = 0;
3284 addr && address_count < sx->max_rcpt; /*XXX maybe also || sx->single_rcpt_domain ? */
3285 addr = addr->next) if (addr->transport_return == PENDING_DEFER)
3288 if (!(addr->dsn_flags & rf_dsnlasthop))
3290 sx->dsn_all_lasthop = FALSE;
3295 /* Add any DSN flags to the mail command */
3297 if (sx->peer_offered & OPTION_DSN && !sx->dsn_all_lasthop)
3299 if (dsn_ret == dsn_ret_hdrs)
3300 { Ustrcpy(p, US" RET=HDRS"); p += 9; }
3301 else if (dsn_ret == dsn_ret_full)
3302 { Ustrcpy(p, US" RET=FULL"); p += 9; }
3306 string_format(p, sizeof(sx->buffer) - (p-sx->buffer), " ENVID=%s", dsn_envid);
3311 /* If an authenticated_sender override has been specified for this transport
3312 instance, expand it. If the expansion is forced to fail, and there was already
3313 an authenticated_sender for this message, the original value will be used.
3314 Other expansion failures are serious. An empty result is ignored, but there is
3315 otherwise no check - this feature is expected to be used with LMTP and other
3316 cases where non-standard addresses (e.g. without domains) might be required. */
3318 return smtp_mail_auth_str(sx, p, addrlist) ? ERROR : OK;
3323 build_rcptcmd_options(smtp_context * sx, const address_item * addr)
3325 uschar * p = sx->buffer;
3328 /* Add any DSN flags to the rcpt command */
3330 if (sx->peer_offered & OPTION_DSN && !(addr->dsn_flags & rf_dsnlasthop))
3332 if (addr->dsn_flags & rf_dsnflags)
3336 Ustrcpy(p, US" NOTIFY=");
3338 for (int i = 0; i < nelem(rf_list); i++) if (addr->dsn_flags & rf_list[i])
3340 if (!first) *p++ = ',';
3342 Ustrcpy(p, rf_names[i]);
3347 if (addr->dsn_orcpt)
3349 string_format(p, sizeof(sx->buffer) - (p-sx->buffer), " ORCPT=%s",
3360 0 good, rcpt results in addr->transport_return (PENDING_OK, DEFER, FAIL)
3361 -1 MAIL response error
3362 -2 any non-MAIL read i/o error
3363 -3 non-MAIL response timeout
3364 -4 internal error; channel still usable
3369 smtp_write_mail_and_rcpt_cmds(smtp_context * sx, int * yield)
3371 address_item * addr;
3372 #ifdef EXPERIMENTAL_ESMTP_LIMITS
3373 address_item * restart_addr = NULL;
3375 int address_count, pipe_limit;
3378 if (build_mailcmd_options(sx, sx->first_addr) != OK)
3384 /* From here until we send the DATA command, we can make use of PIPELINING
3385 if the server host supports it. The code has to be able to check the responses
3386 at any point, for when the buffer fills up, so we write it totally generally.
3387 When PIPELINING is off, each command written reports that it has flushed the
3390 sx->pending_MAIL = TRUE; /* The block starts with MAIL */
3393 uschar * s = sx->from_addr;
3395 uschar * errstr = NULL;
3397 /* If we must downconvert, do the from-address here. Remember we had to
3398 for the to-addresses (done below), and also (ugly) for re-doing when building
3399 the delivery log line. */
3401 if ( sx->addrlist->prop.utf8_msg
3402 && (sx->addrlist->prop.utf8_downcvt || !(sx->peer_offered & OPTION_UTF8))
3405 if (s = string_address_utf8_to_alabel(s, &errstr), errstr)
3407 set_errno_nohost(sx->addrlist, ERRNO_EXPANDFAIL, errstr, DEFER, FALSE, &sx->delivery_start);
3411 setflag(sx->addrlist, af_utf8_downcvt);
3415 rc = smtp_write_command(sx, pipelining_active ? SCMD_BUFFER : SCMD_FLUSH,
3416 "MAIL FROM:<%s>%s\r\n", s, sx->buffer);
3419 mail_command = string_copy(big_buffer); /* Save for later error message */
3423 case -1: /* Transmission error */
3426 case +1: /* Cmd was sent */
3427 if (!smtp_read_response(sx, sx->buffer, sizeof(sx->buffer), '2',
3428 (SOB sx->conn_args.ob)->command_timeout))
3430 if (errno == 0 && sx->buffer[0] == '4')
3432 errno = ERRNO_MAIL4XX;
3433 sx->addrlist->more_errno |= ((sx->buffer[1] - '0')*10 + sx->buffer[2] - '0') << 8;
3437 sx->pending_MAIL = FALSE;
3440 /* otherwise zero: command queued for pipeline */
3443 /* Pass over all the relevant recipient addresses for this host, which are the
3444 ones that have status PENDING_DEFER. If we are using PIPELINING, we can send
3445 several before we have to read the responses for those seen so far. This
3446 checking is done by a subroutine because it also needs to be done at the end.
3447 Send only up to max_rcpt addresses at a time, leaving next_addr pointing to
3448 the next one if not all are sent.
3450 In the MUA wrapper situation, we want to flush the PIPELINING buffer for the
3451 last address because we want to abort if any recipients have any kind of
3452 problem, temporary or permanent. We know that all recipient addresses will have
3453 the PENDING_DEFER status, because only one attempt is ever made, and we know
3454 that max_rcpt will be large, so all addresses will be done at once.
3456 For verify we flush the pipeline after any (the only) rcpt address. */
3458 for (addr = sx->first_addr, address_count = 0, pipe_limit = 100;
3459 addr && address_count < sx->max_rcpt;
3460 addr = addr->next) if (addr->transport_return == PENDING_DEFER)
3466 #ifdef EXPERIMENTAL_ESMTP_LIMITS
3467 if ( sx->single_rcpt_domain /* restriction on domains */
3468 && address_count > 0 /* not first being sent */
3469 && Ustrcmp(addr->domain, sx->first_addr->domain) != 0 /* dom diff from first */
3472 DEBUG(D_transport) debug_printf("skipping different domain %s\n", addr->domain);
3474 /* Ensure the smtp-response reaper does not think the address had a RCPT
3475 command sent for it. Reset to PENDING_DEFER in smtp_deliver(), where we
3476 goto SEND_MESSAGE. */
3478 addr->transport_return = SKIP;
3479 if (!restart_addr) restart_addr = addr; /* note restart point */
3480 continue; /* skip this one */
3484 addr->dsn_aware = sx->peer_offered & OPTION_DSN
3485 ? dsn_support_yes : dsn_support_no;
3488 if (pipe_limit-- <= 0)
3489 { no_flush = FALSE; pipe_limit = 100; }
3491 no_flush = pipelining_active && !sx->verify
3492 && (!mua_wrapper || addr->next && address_count < sx->max_rcpt);
3494 build_rcptcmd_options(sx, addr);
3496 /* Now send the RCPT command, and process outstanding responses when
3497 necessary. After a timeout on RCPT, we just end the function, leaving the
3498 yield as OK, because this error can often mean that there is a problem with
3499 just one address, so we don't want to delay the host. */
3501 rcpt_addr = transport_rcpt_address(addr, sx->conn_args.tblock->rcpt_include_affixes);
3504 if ( testflag(sx->addrlist, af_utf8_downcvt)
3505 && !(rcpt_addr = string_address_utf8_to_alabel(rcpt_addr, NULL))
3508 /*XXX could we use a per-address errstr here? Not fail the whole send? */
3509 errno = ERRNO_EXPANDFAIL;
3510 return -5; /*XXX too harsh? */
3514 cmds_sent = smtp_write_command(sx, no_flush ? SCMD_BUFFER : SCMD_FLUSH,
3515 "RCPT TO:<%s>%s%s\r\n", rcpt_addr, sx->igquotstr, sx->buffer);
3517 if (cmds_sent < 0) return -5;
3520 switch(sync_responses(sx, cmds_sent, 0))
3522 case 3: sx->ok = TRUE; /* 2xx & 5xx => OK & progress made */
3523 case 2: sx->completed_addr = TRUE; /* 5xx (only) => progress made */
3526 case 1: sx->ok = TRUE; /* 2xx (only) => OK, but if LMTP, */
3527 if (!sx->lmtp) /* can't tell about progress yet */
3528 sx->completed_addr = TRUE;
3529 case 0: /* No 2xx or 5xx, but no probs */
3530 /* If any RCPT got a 452 response then next_addr has been updated
3531 for restarting with a new MAIL on the same connection. Send no more
3532 RCPTs for this MAIL. */
3536 DEBUG(D_transport) debug_printf("seen 452 too-many-rcpts\n");
3537 sx->RCPT_452 = FALSE;
3538 /* sx->next_addr has been reset for fast_retry */
3543 case -1: return -3; /* Timeout on RCPT */
3544 case -2: return -2; /* non-MAIL read i/o error */
3545 default: return -1; /* any MAIL error */
3547 #ifndef DISABLE_PIPE_CONNECT
3548 case -4: return -1; /* non-2xx for pipelined banner or EHLO */
3549 case -5: return -1; /* TLS first-read error */
3553 } /* Loop for next address */
3555 #ifdef EXPERIMENTAL_ESMTP_LIMITS
3556 sx->next_addr = restart_addr ? restart_addr : addr;
3558 sx->next_addr = addr;
3565 /*****************************************************
3566 * Proxy TLS connection for another transport process *
3567 ******************************************************/
3569 Close the unused end of the pipe, fork once more, then use the given buffer
3570 as a staging area, and select on both the given fd and the TLS'd client-fd for
3571 data to read (per the coding in ip_recv() and fd_ready() this is legitimate).
3572 Do blocking full-size writes, and reads under a timeout. Once both input
3573 channels are closed, exit the process.
3577 buf space to use for buffering
3578 bufsiz size of buffer
3579 pfd pipe filedescriptor array; [0] is comms to proxied process
3580 timeout per-read timeout, seconds
3581 host hostname of remote
3587 smtp_proxy_tls(void * ct_ctx, uschar * buf, size_t bsize, int * pfd,
3588 int timeout, const uschar * host)
3590 struct pollfd p[2] = {{.fd = tls_out.active.sock, .events = POLLIN},
3591 {.fd = pfd[0], .events = POLLIN}};
3593 BOOL send_tls_shutdown = TRUE;
3596 if ((rc = exim_fork(US"tls-proxy")))
3597 _exit(rc < 0 ? EXIT_FAILURE : EXIT_SUCCESS);
3599 set_process_info("proxying TLS connection for continued transport to %s\n", host);
3603 time_t time_left = timeout;
3604 time_t time_start = time(NULL);
3609 rc = poll(p, 2, time_left * 1000);
3611 if (rc < 0 && errno == EINTR)
3612 if ((time_left -= time(NULL) - time_start) > 0) continue;
3616 DEBUG(D_transport) if (rc == 0) debug_printf("%s: timed out\n", __FUNCTION__);
3620 /* For errors where not readable, bomb out */
3622 if (p[0].revents & POLLERR || p[1].revents & POLLERR)
3624 DEBUG(D_transport) debug_printf("select: exceptional cond on %s fd\n",
3625 p[0].revents & POLLERR ? "tls" : "proxy");
3626 if (!(p[0].revents & POLLIN || p[1].events & POLLIN))
3628 DEBUG(D_transport) debug_printf("- but also readable; no exit yet\n");
3631 while (rc < 0 || !(p[0].revents & POLLIN || p[1].revents & POLLIN));
3633 /* handle inbound data */
3634 if (p[0].revents & POLLIN)
3635 if ((rc = tls_read(ct_ctx, buf, bsize)) <= 0) /* Expect -1 for EOF; */
3636 { /* that reaps the TLS Close Notify record */
3638 shutdown(pfd[0], SHUT_WR);
3642 for (int nbytes = 0; rc - nbytes > 0; nbytes += i)
3643 if ((i = write(pfd[0], buf + nbytes, rc - nbytes)) < 0) goto done;
3645 /* Handle outbound data. We cannot combine payload and the TLS-close
3646 due to the limitations of the (pipe) channel feeding us. Maybe use a unix-domain
3648 if (p[1].revents & POLLIN)
3649 if ((rc = read(pfd[0], buf, bsize)) <= 0)
3653 # ifdef EXIM_TCP_CORK /* Use _CORK to get TLS Close Notify in FIN segment */
3654 (void) setsockopt(tls_out.active.sock, IPPROTO_TCP, EXIM_TCP_CORK, US &on, sizeof(on));
3656 tls_shutdown_wr(ct_ctx);
3657 send_tls_shutdown = FALSE;
3658 shutdown(tls_out.active.sock, SHUT_WR);
3661 for (int nbytes = 0; rc - nbytes > 0; nbytes += i)
3662 if ((i = tls_write(ct_ctx, buf + nbytes, rc - nbytes, FALSE)) < 0)
3665 while (p[0].fd >= 0 || p[1].fd >= 0);
3668 if (send_tls_shutdown) tls_close(ct_ctx, TLS_SHUTDOWN_NOWAIT);
3670 testharness_pause_ms(100); /* let logging complete */
3671 exim_exit(EXIT_SUCCESS);
3676 /*************************************************
3677 * Deliver address list to given host *
3678 *************************************************/
3680 /* If continue_hostname is not null, we get here only when continuing to
3681 deliver down an existing channel. The channel was passed as the standard
3682 input. TLS is never active on a passed channel; the previous process either
3683 closes it down before passing the connection on, or inserts a TLS-proxy
3684 process and passes on a cleartext conection.
3686 Otherwise, we have to make a connection to the remote host, and do the
3687 initial protocol exchange.
3689 When running as an MUA wrapper, if the sender or any recipient is rejected,
3690 temporarily or permanently, we force failure for all recipients.
3693 addrlist chain of potential addresses to deliver; only those whose
3694 transport_return field is set to PENDING_DEFER are currently
3695 being processed; others should be skipped - they have either
3696 been delivered to an earlier host or IP address, or been
3697 failed by one of them.
3698 host host to deliver to
3699 host_af AF_INET or AF_INET6
3700 defport default TCP/IP port to use if host does not specify, in host
3702 interface interface to bind to, or NULL
3703 tblock transport instance block
3704 message_defer set TRUE if yield is OK, but all addresses were deferred
3705 because of a non-recipient, non-host failure, that is, a
3706 4xx response to MAIL FROM, DATA, or ".". This is a defer
3707 that is specific to the message.
3708 suppress_tls if TRUE, don't attempt a TLS connection - this is set for
3709 a second attempt after TLS initialization fails
3711 Returns: OK - the connection was made and the delivery attempted;
3712 the result for each address is in its data block.
3713 DEFER - the connection could not be made, or something failed
3714 while setting up the SMTP session, or there was a
3715 non-message-specific error, such as a timeout.
3716 ERROR - a filter command is specified for this transport,
3717 and there was a problem setting it up; OR helo_data
3718 or add_headers or authenticated_sender is specified
3719 for this transport, and the string failed to expand
3721 For all non-OK returns the first addr of the list carries the
3722 time taken for the attempt.
3726 smtp_deliver(address_item *addrlist, host_item *host, int host_af, int defport,
3727 uschar *interface, transport_instance *tblock,
3728 BOOL *message_defer, BOOL suppress_tls)
3730 smtp_transport_options_block * ob = SOB tblock->options_block;
3735 uschar *message = NULL;
3736 uschar new_message_id[MESSAGE_ID_LENGTH + 1];
3737 smtp_context * sx = store_get(sizeof(*sx), GET_TAINTED); /* tainted, for the data buffers */
3738 BOOL pass_message = FALSE;
3739 #ifdef EXPERIMENTAL_ESMTP_LIMITS
3740 BOOL mail_limit = FALSE;
3745 BOOL tcw_done = FALSE, tcw = FALSE;
3747 *message_defer = FALSE;
3749 memset(sx, 0, sizeof(*sx));
3750 sx->addrlist = addrlist;
3751 sx->conn_args.host = host;
3752 sx->conn_args.host_af = host_af;
3754 sx->conn_args.interface = interface;
3755 sx->helo_data = NULL;
3756 sx->conn_args.tblock = tblock;
3757 sx->conn_args.sock = -1;
3758 gettimeofday(&sx->delivery_start, NULL);
3759 sx->sync_addr = sx->first_addr = addrlist;
3766 /* Get the channel set up ready for a message, MAIL FROM being the next
3767 SMTP command to send. */
3769 if ((rc = smtp_setup_conn(sx, suppress_tls)) != OK)
3771 timesince(&addrlist->delivery_time, &sx->delivery_start);
3777 /* If the connection used DANE, ignore for now any addresses with incompatible
3778 domains. The SNI has to be the domain. Arrange a whole new TCP conn later,
3779 just in case only TLS isn't enough. */
3781 if (sx->conn_args.dane)
3783 const uschar * dane_domain = sx->first_addr->domain;
3785 for (address_item * a = sx->first_addr->next; a; a = a->next)
3786 if ( a->transport_return == PENDING_DEFER
3787 && Ustrcmp(dane_domain, a->domain) != 0)
3789 DEBUG(D_transport) debug_printf("DANE: holding %s for later\n", a->domain);
3791 a->transport_return = DANE;
3796 /* If there is a filter command specified for this transport, we can now
3797 set it up. This cannot be done until the identity of the host is known. */
3799 if (tblock->filter_command)
3801 transport_filter_timeout = tblock->filter_timeout;
3803 /* On failure, copy the error to all addresses, abandon the SMTP call, and
3806 if (!transport_set_up_command(&transport_filter_argv,
3807 tblock->filter_command, TRUE, DEFER, addrlist, FALSE,
3808 string_sprintf("%.50s transport filter", tblock->name), NULL))
3810 set_errno_nohost(addrlist->next, addrlist->basic_errno, addrlist->message, DEFER,
3811 FALSE, &sx->delivery_start);
3816 if ( transport_filter_argv
3817 && *transport_filter_argv
3818 && **transport_filter_argv
3819 && smtp_peer_options & OPTION_CHUNKING
3820 #ifndef DISABLE_DKIM
3821 /* When dkim signing, chunking is handled even with a transport-filter */
3822 && !(ob->dkim.dkim_private_key && ob->dkim.dkim_domain && ob->dkim.dkim_selector)
3823 && !ob->dkim.force_bodyhash
3827 smtp_peer_options &= ~OPTION_CHUNKING;
3828 DEBUG(D_transport) debug_printf("CHUNKING not usable due to transport filter\n");
3832 /* For messages that have more than the maximum number of envelope recipients,
3833 we want to send several transactions down the same SMTP connection. (See
3834 comments in deliver.c as to how this reconciles, heuristically, with
3835 remote_max_parallel.) This optimization was added to Exim after the following
3836 code was already working. The simplest way to put it in without disturbing the
3837 code was to use a goto to jump back to this point when there is another
3838 transaction to handle. */
3841 sx->from_addr = return_path;
3842 sx->sync_addr = sx->first_addr;
3844 sx->send_rset = TRUE;
3845 sx->completed_addr = FALSE;
3848 /* If we are a continued-connection-after-verify the MAIL and RCPT
3849 commands were already sent; do not re-send but do mark the addrs as
3850 having been accepted up to RCPT stage. A traditional cont-conn
3851 always has a sequence number greater than one. */
3853 if (continue_hostname && continue_sequence == 1)
3855 /* sx->pending_MAIL = FALSE; */
3857 /* sx->next_addr = NULL; */
3859 for (address_item * addr = addrlist; addr; addr = addr->next)
3860 addr->transport_return = PENDING_OK;
3864 /* Initiate a message transfer. */
3866 switch(smtp_write_mail_and_rcpt_cmds(sx, &yield))
3869 case -1: case -2: goto RESPONSE_FAILED;
3870 case -3: goto END_OFF;
3871 case -4: goto SEND_QUIT;
3872 default: goto SEND_FAILED;
3875 /* If we are an MUA wrapper, abort if any RCPTs were rejected, either
3876 permanently or temporarily. We should have flushed and synced after the last
3884 for (a = sx->first_addr, cnt = 0; a && cnt < sx->max_rcpt; a = a->next, cnt++)
3885 if (a->transport_return != PENDING_OK)
3887 /*XXX could we find a better errno than 0 here? */
3888 set_errno_nohost(addrlist, 0, a->message, FAIL,
3889 testflag(a, af_pass_message), &sx->delivery_start);
3896 /* If ok is TRUE, we know we have got at least one good recipient, and must now
3897 send DATA, but if it is FALSE (in the normal, non-wrapper case), we may still
3898 have a good recipient buffered up if we are pipelining. We don't want to waste
3899 time sending DATA needlessly, so we only send it if either ok is TRUE or if we
3900 are pipelining. The responses are all handled by sync_responses().
3901 If using CHUNKING, do not send a BDAT until we know how big a chunk we want
3904 if ( !(smtp_peer_options & OPTION_CHUNKING)
3905 && (sx->ok || (pipelining_active && !mua_wrapper)))
3907 int count = smtp_write_command(sx, SCMD_FLUSH, "DATA\r\n");
3909 if (count < 0) goto SEND_FAILED;
3910 switch(sync_responses(sx, count, sx->ok ? +1 : -1))
3912 case 3: sx->ok = TRUE; /* 2xx & 5xx => OK & progress made */
3913 case 2: sx->completed_addr = TRUE; /* 5xx (only) => progress made */
3916 case 1: sx->ok = TRUE; /* 2xx (only) => OK, but if LMTP, */
3917 if (!sx->lmtp) sx->completed_addr = TRUE; /* can't tell about progress yet */
3918 case 0: break; /* No 2xx or 5xx, but no probs */
3920 case -1: goto END_OFF; /* Timeout on RCPT */
3922 #ifndef DISABLE_PIPE_CONNECT
3923 case -5: /* TLS first-read error */
3924 case -4: HDEBUG(D_transport)
3925 debug_printf("failed reaping pipelined cmd responses\n");
3927 default: goto RESPONSE_FAILED; /* I/O error, or any MAIL/DATA error */
3929 pipelining_active = FALSE;
3930 data_command = string_copy(big_buffer); /* Save for later error message */
3933 /* If there were no good recipients (but otherwise there have been no
3934 problems), just set ok TRUE, since we have handled address-specific errors
3935 already. Otherwise, it's OK to send the message. Use the check/escape mechanism
3936 for handling the SMTP dot-handling protocol, flagging to apply to headers as
3937 well as body. Set the appropriate timeout value to be used for each chunk.
3938 (Haven't been able to make it work using select() for writing yet.) */
3941 && (!(smtp_peer_options & OPTION_CHUNKING) || !pipelining_active))
3943 /* Save the first address of the next batch. */
3944 sx->first_addr = sx->next_addr;
3950 transport_ctx tctx = {
3951 .u = {.fd = sx->cctx.sock}, /*XXX will this need TLS info? */
3954 .check_string = US".",
3955 .escape_string = US"..", /* Escaping strings */
3957 topt_use_crlf | topt_escape_headers
3958 | (tblock->body_only ? topt_no_headers : 0)
3959 | (tblock->headers_only ? topt_no_body : 0)
3960 | (tblock->return_path_add ? topt_add_return_path : 0)
3961 | (tblock->delivery_date_add ? topt_add_delivery_date : 0)
3962 | (tblock->envelope_to_add ? topt_add_envelope_to : 0)
3965 /* If using CHUNKING we need a callback from the generic transport
3966 support to us, for the sending of BDAT smtp commands and the reaping
3967 of responses. The callback needs a whole bunch of state so set up
3968 a transport-context structure to be passed around. */
3970 if (smtp_peer_options & OPTION_CHUNKING)
3972 tctx.check_string = tctx.escape_string = NULL;
3973 tctx.options |= topt_use_bdat;
3974 tctx.chunk_cb = smtp_chunk_cmd_callback;
3975 sx->pending_BDAT = FALSE;
3976 sx->good_RCPT = sx->ok;
3978 tctx.smtp_context = sx;
3981 tctx.options |= topt_end_dot;
3983 /* Save the first address of the next batch. */
3984 sx->first_addr = sx->next_addr;
3986 /* Responses from CHUNKING commands go in buffer. Otherwise,
3987 there has not been a response. */
3991 sigalrm_seen = FALSE;
3992 transport_write_timeout = ob->data_timeout;
3993 smtp_command = US"sending data block"; /* For error messages */
3994 DEBUG(D_transport|D_v)
3995 if (smtp_peer_options & OPTION_CHUNKING)
3996 debug_printf(" will write message using CHUNKING\n");
3998 debug_printf(" SMTP>> (writing message)\n");
3999 transport_count = 0;
4001 #ifndef DISABLE_DKIM
4003 # ifdef MEASURE_TIMING
4005 gettimeofday(&t0, NULL);
4007 dkim_exim_sign_init();
4008 # ifdef EXPERIMENTAL_ARC
4010 uschar * s = ob->arc_sign;
4013 if (!(ob->dkim.arc_signspec = s = expand_string(s)))
4015 if (!f.expand_string_forcedfail)
4017 message = US"failed to expand arc_sign";
4024 /* Ask dkim code to hash the body for ARC */
4025 (void) arc_ams_setup_sign_bodyhash();
4026 ob->dkim.force_bodyhash = TRUE;
4031 # ifdef MEASURE_TIMING
4032 report_time_since(&t0, US"dkim_exim_sign_init (delta)");
4037 /* See if we can pipeline QUIT. Reasons not to are
4038 - pipelining not active
4039 - not ok to send quit
4040 - errors in amtp transation responses
4041 - more addrs to send for this message or this host
4042 - this message was being retried
4043 - more messages for this host
4044 If we can, we want the message-write to not flush (the tail end of) its data out. */
4046 if ( sx->pipelining_used
4047 && (sx->ok && sx->completed_addr || smtp_peer_options & OPTION_CHUNKING)
4049 && !(sx->first_addr || f.continue_more)
4050 && f.deliver_firsttime
4053 smtp_compare_t t_compare =
4054 {.tblock = tblock, .current_sender_address = sender_address};
4059 ( tls_out.active.sock < 0 && !continue_proxy_cipher
4060 || verify_check_given_host(CUSS &ob->hosts_nopass_tls, host) != OK
4064 transport_check_waiting(tblock->name, host->name,
4065 tblock->connection_max_messages, new_message_id,
4066 (oicf)smtp_are_same_identities, (void*)&t_compare);
4069 HDEBUG(D_transport) debug_printf("will pipeline QUIT\n");
4070 tctx.options |= topt_no_flush;
4074 #ifndef DISABLE_DKIM
4075 sx->ok = dkim_transport_write_message(&tctx, &ob->dkim, CUSS &message);
4077 sx->ok = transport_write_message(&tctx, 0);
4080 /* transport_write_message() uses write() because it is called from other
4081 places to write to non-sockets. This means that under some OS (e.g. Solaris)
4082 it can exit with "Broken pipe" as its error. This really means that the
4083 socket got closed at the far end. */
4085 transport_write_timeout = 0; /* for subsequent transports */
4087 /* Failure can either be some kind of I/O disaster (including timeout),
4088 or the failure of a transport filter or the expansion of added headers.
4089 Or, when CHUNKING, it can be a protocol-detected failure. */
4092 if (message) goto SEND_FAILED;
4093 else goto RESPONSE_FAILED;
4095 /* We used to send the terminating "." explicitly here, but because of
4096 buffering effects at both ends of TCP/IP connections, you don't gain
4097 anything by keeping it separate, so it might as well go in the final
4098 data buffer for efficiency. This is now done by setting the topt_end_dot
4101 smtp_command = US"end of data";
4103 /* If we can pipeline a QUIT with the data them send it now. If a new message
4104 for this host appeared in the queue while data was being sent, we will not see
4105 it and it will have to wait for a queue run. If there was one but another
4106 thread took it, we might attempt to send it - but locking of spoolfiles will
4107 detect that. Use _MORE to get QUIT in FIN segment. */
4109 if (tcw_done && !tcw)
4111 /*XXX jgh 2021/03/10 google et. al screwup. G, at least, sends TCP FIN in response to TLS
4112 close-notify. Under TLS 1.3, violating RFC.
4113 However, TLS 1.2 does not have half-close semantics. */
4115 if ( sx->cctx.tls_ctx
4116 #if 0 && !defined(DISABLE_TLS)
4117 && Ustrcmp(tls_out.ver, "TLS1.3") != 0
4119 || !f.deliver_firsttime
4121 { /* Send QUIT now and not later */
4122 (void)smtp_write_command(sx, SCMD_FLUSH, "QUIT\r\n");
4123 sx->send_quit = FALSE;
4126 { /* add QUIT to the output buffer */
4127 (void)smtp_write_command(sx, SCMD_MORE, "QUIT\r\n");
4128 sx->send_quit = FALSE; /* avoid sending it later */
4131 if (sx->cctx.tls_ctx && sx->send_tlsclose) /* need to send TLS Close Notify */
4133 # ifdef EXIM_TCP_CORK /* Use _CORK to get Close Notify in FIN segment */
4134 (void) setsockopt(sx->cctx.sock, IPPROTO_TCP, EXIM_TCP_CORK, US &on, sizeof(on));
4136 tls_shutdown_wr(sx->cctx.tls_ctx);
4137 sx->send_tlsclose = FALSE; /* avoid later repeat */
4140 HDEBUG(D_transport|D_acl|D_v) debug_printf_indent(" SMTP(shutdown)>>\n");
4141 shutdown(sx->cctx.sock, SHUT_WR); /* flush output buffer, with TCP FIN */
4145 if (smtp_peer_options & OPTION_CHUNKING && sx->cmd_count > 1)
4147 /* Reap any outstanding MAIL & RCPT commands, but not a DATA-go-ahead */
4148 switch(sync_responses(sx, sx->cmd_count-1, 0))
4150 case 3: sx->ok = TRUE; /* 2xx & 5xx => OK & progress made */
4151 case 2: sx->completed_addr = TRUE; /* 5xx (only) => progress made */
4154 case 1: sx->ok = TRUE; /* 2xx (only) => OK, but if LMTP, */
4155 if (!sx->lmtp) sx->completed_addr = TRUE; /* can't tell about progress yet */
4156 case 0: break; /* No 2xx or 5xx, but no probs */
4158 case -1: goto END_OFF; /* Timeout on RCPT */
4160 #ifndef DISABLE_PIPE_CONNECT
4161 case -5: /* TLS first-read error */
4162 case -4: HDEBUG(D_transport)
4163 debug_printf("failed reaping pipelined cmd responses\n");
4165 default: goto RESPONSE_FAILED; /* I/O error, or any MAIL/DATA error */
4169 #ifndef DISABLE_PRDR
4170 /* For PRDR we optionally get a partial-responses warning followed by the
4171 individual responses, before going on with the overall response. If we don't
4172 get the warning then deal with per non-PRDR. */
4176 sx->ok = smtp_read_response(sx, sx->buffer, sizeof(sx->buffer), '3', ob->final_timeout);
4177 if (!sx->ok && errno == 0) switch(sx->buffer[0])
4179 case '2': sx->prdr_active = FALSE;
4182 case '4': errno = ERRNO_DATA4XX;
4183 addrlist->more_errno |=
4184 ((sx->buffer[1] - '0')*10 + sx->buffer[2] - '0') << 8;
4191 /* For non-PRDR SMTP, we now read a single response that applies to the
4192 whole message. If it is OK, then all the addresses have been delivered. */
4196 sx->ok = smtp_read_response(sx, sx->buffer, sizeof(sx->buffer), '2',
4198 if (!sx->ok && errno == 0 && sx->buffer[0] == '4')
4200 errno = ERRNO_DATA4XX;
4201 addrlist->more_errno |= ((sx->buffer[1] - '0')*10 + sx->buffer[2] - '0') << 8;
4205 /* For LMTP, we get back a response for every RCPT command that we sent;
4206 some may be accepted and some rejected. For those that get a response, their
4207 status is fixed; any that are accepted have been handed over, even if later
4208 responses crash - at least, that's how I read RFC 2033.
4210 If all went well, mark the recipient addresses as completed, record which
4211 host/IPaddress they were delivered to, and cut out RSET when sending another
4212 message down the same channel. Write the completed addresses to the journal
4213 now so that they are recorded in case there is a crash of hardware or
4214 software before the spool gets updated. Also record the final SMTP
4215 confirmation if needed (for SMTP only). */
4220 struct timeval delivery_time;
4222 uschar * conf = NULL;
4224 timesince(&delivery_time, &sx->delivery_start);
4225 sx->send_rset = FALSE;
4226 pipelining_active = FALSE;
4228 /* Set up confirmation if needed - applies only to SMTP */
4231 #ifdef DISABLE_EVENT
4232 LOGGING(smtp_confirmation) &&
4237 const uschar * s = string_printing(sx->buffer);
4238 /* deconst cast ok here as string_printing was checked to have alloc'n'copied */
4239 conf = s == sx->buffer ? US string_copy(s) : US s;
4242 /* Process all transported addresses - for LMTP or PRDR, read a status for
4243 each one. We used to drop out at first_addr, until someone returned a 452
4244 followed by a 250... and we screwed up the accepted addresses. */
4246 for (address_item * addr = addrlist; addr; addr = addr->next)
4248 if (addr->transport_return != PENDING_OK) continue;
4250 /* LMTP - if the response fails badly (e.g. timeout), use it for all the
4251 remaining addresses. Otherwise, it's a return code for just the one
4252 address. For temporary errors, add a retry item for the address so that
4253 it doesn't get tried again too soon. */
4255 #ifndef DISABLE_PRDR
4256 if (sx->lmtp || sx->prdr_active)
4261 if (!smtp_read_response(sx, sx->buffer, sizeof(sx->buffer), '2',
4264 if (errno != 0 || sx->buffer[0] == 0) goto RESPONSE_FAILED;
4265 addr->message = string_sprintf(
4266 #ifndef DISABLE_PRDR
4267 "%s error after %s: %s", sx->prdr_active ? "PRDR":"LMTP",
4269 "LMTP error after %s: %s",
4271 data_command, string_printing(sx->buffer));
4272 setflag(addr, af_pass_message); /* Allow message to go to user */
4273 if (sx->buffer[0] == '5')
4274 addr->transport_return = FAIL;
4277 errno = ERRNO_DATA4XX;
4278 addr->more_errno |= ((sx->buffer[1] - '0')*10 + sx->buffer[2] - '0') << 8;
4279 addr->transport_return = DEFER;
4280 #ifndef DISABLE_PRDR
4281 if (!sx->prdr_active)
4283 retry_add_item(addr, addr->address_retry_key, 0);
4287 sx->completed_addr = TRUE; /* NOW we can set this flag */
4288 if (LOGGING(smtp_confirmation))
4290 const uschar *s = string_printing(sx->buffer);
4291 /* deconst cast ok here as string_printing was checked to have alloc'n'copied */
4292 conf = (s == sx->buffer) ? US string_copy(s) : US s;
4296 /* SMTP, or success return from LMTP for this address. Pass back the
4297 actual host that was used. */
4299 addr->transport_return = OK;
4300 addr->host_used = host;
4301 addr->delivery_time = delivery_time;
4302 addr->special_action = flag;
4303 addr->message = conf;
4305 if (tcp_out_fastopen)
4307 setflag(addr, af_tcp_fastopen_conn);
4308 if (tcp_out_fastopen >= TFO_USED_NODATA) setflag(addr, af_tcp_fastopen);
4309 if (tcp_out_fastopen >= TFO_USED_DATA) setflag(addr, af_tcp_fastopen_data);
4311 if (sx->pipelining_used) setflag(addr, af_pipelining);
4312 #ifndef DISABLE_PIPE_CONNECT
4313 if (sx->early_pipe_active) setflag(addr, af_early_pipe);
4315 #ifndef DISABLE_PRDR
4316 if (sx->prdr_active) setflag(addr, af_prdr_used);
4318 if (smtp_peer_options & OPTION_CHUNKING) setflag(addr, af_chunking_used);
4321 #ifndef DISABLE_PRDR
4322 if (!sx->prdr_active)
4325 /* Update the journal. For homonymic addresses, use the base address plus
4326 the transport name. See lots of comments in deliver.c about the reasons
4327 for the complications when homonyms are involved. Just carry on after
4328 write error, as it may prove possible to update the spool file later. */
4330 if (testflag(addr, af_homonym))
4331 sprintf(CS sx->buffer, "%.500s/%s\n", addr->unique + 3, tblock->name);
4333 sprintf(CS sx->buffer, "%.500s\n", addr->unique);
4335 DEBUG(D_deliver) debug_printf("S:journalling %s", sx->buffer);
4336 len = Ustrlen(CS sx->buffer);
4337 if (write(journal_fd, sx->buffer, len) != len)
4338 log_write(0, LOG_MAIN|LOG_PANIC, "failed to write journal for "
4339 "%s: %s", sx->buffer, strerror(errno));
4343 #ifndef DISABLE_PRDR
4344 if (sx->prdr_active)
4346 const uschar * overall_message;
4348 /* PRDR - get the final, overall response. For any non-success
4349 upgrade all the address statuses. */
4351 sx->ok = smtp_read_response(sx, sx->buffer, sizeof(sx->buffer), '2',
4355 if(errno == 0 && sx->buffer[0] == '4')
4357 errno = ERRNO_DATA4XX;
4358 addrlist->more_errno |= ((sx->buffer[1] - '0')*10 + sx->buffer[2] - '0') << 8;
4360 for (address_item * addr = addrlist; addr != sx->first_addr; addr = addr->next)
4361 if (sx->buffer[0] == '5' || addr->transport_return == OK)
4362 addr->transport_return = PENDING_OK; /* allow set_errno action */
4363 goto RESPONSE_FAILED;
4366 /* Append the overall response to the individual PRDR response for logging
4367 and update the journal, or setup retry. */
4369 overall_message = string_printing(sx->buffer);
4370 for (address_item * addr = addrlist; addr != sx->first_addr; addr = addr->next)
4371 if (addr->transport_return == OK)
4372 addr->message = string_sprintf("%s\\n%s", addr->message, overall_message);
4374 for (address_item * addr = addrlist; addr != sx->first_addr; addr = addr->next)
4375 if (addr->transport_return == OK)
4377 if (testflag(addr, af_homonym))
4378 sprintf(CS sx->buffer, "%.500s/%s\n", addr->unique + 3, tblock->name);
4380 sprintf(CS sx->buffer, "%.500s\n", addr->unique);
4382 DEBUG(D_deliver) debug_printf("journalling(PRDR) %s\n", sx->buffer);
4383 len = Ustrlen(CS sx->buffer);
4384 if (write(journal_fd, sx->buffer, len) != len)
4385 log_write(0, LOG_MAIN|LOG_PANIC, "failed to write journal for "
4386 "%s: %s", sx->buffer, strerror(errno));
4388 else if (addr->transport_return == DEFER)
4389 /*XXX magic value -2 ? maybe host+message ? */
4390 retry_add_item(addr, addr->address_retry_key, -2);
4394 /* Ensure the journal file is pushed out to disk. */
4396 if (EXIMfsync(journal_fd) < 0)
4397 log_write(0, LOG_MAIN|LOG_PANIC, "failed to fsync journal: %s",
4403 /* Handle general (not specific to one address) failures here. The value of ok
4404 is used to skip over this code on the falling through case. A timeout causes a
4405 deferral. Other errors may defer or fail according to the response code, and
4406 may set up a special errno value, e.g. after connection chopped, which is
4407 assumed if errno == 0 and there is no text in the buffer. If control reaches
4408 here during the setting up phase (i.e. before MAIL FROM) then always defer, as
4409 the problem is not related to this specific message. */
4414 uschar * set_message;
4420 /* Clear send_quit flag if needed. Do not set. */
4421 sx->send_quit &= check_response(host, &save_errno, addrlist->more_errno,
4422 sx->buffer, &code, &message, &pass_message);
4430 message = string_sprintf("smtp send to %s [%s] failed: %s",
4431 host->name, host->address, message ? message : US strerror(save_errno));
4432 sx->send_quit = FALSE;
4440 sx->ok = FALSE; /* For when reached by GOTO */
4441 set_message = message;
4443 /* We want to handle timeouts after MAIL or "." and loss of connection after
4444 "." specially. They can indicate a problem with the sender address or with
4445 the contents of the message rather than a real error on the connection. These
4446 cases are treated in the same way as a 4xx response. This next bit of code
4447 does the classification. */
4454 message_error = TRUE;
4458 message_error = Ustrncmp(smtp_command,"MAIL",4) == 0 ||
4459 Ustrncmp(smtp_command,"end ",4) == 0;
4462 case ERRNO_SMTPCLOSED:
4463 message_error = Ustrncmp(smtp_command,"end ",4) == 0;
4466 #ifndef DISABLE_DKIM
4468 /* DKIM signing failure: avoid thinking we pipelined quit,
4469 just abandon the message and close the socket. */
4471 message_error = FALSE;
4472 # ifndef DISABLE_TLS
4473 if (sx->cctx.tls_ctx)
4475 tls_close(sx->cctx.tls_ctx,
4476 sx->send_tlsclose ? TLS_SHUTDOWN_WAIT : TLS_SHUTDOWN_WONLY);
4477 sx->cctx.tls_ctx = NULL;
4483 message_error = FALSE;
4487 /* Handle the cases that are treated as message errors. These are:
4489 (a) negative response or timeout after MAIL
4490 (b) negative response after DATA
4491 (c) negative response or timeout or dropped connection after "."
4492 (d) utf8 support required and not offered
4494 It won't be a negative response or timeout after RCPT, as that is dealt
4495 with separately above. The action in all cases is to set an appropriate
4496 error code for all the addresses, but to leave yield set to OK because the
4497 host itself has not failed. Of course, it might in practice have failed
4498 when we've had a timeout, but if so, we'll discover that at the next
4499 delivery attempt. For a temporary error, set the message_defer flag, and
4500 write to the logs for information if this is not the last host. The error
4501 for the last host will be logged as part of the address's log line. */
4505 if (mua_wrapper) code = '5'; /* Force hard failure in wrapper mode */
4507 /* If there's an errno, the message contains just the identity of
4512 else /* Anything other than 5 is treated as temporary */
4516 message = US string_sprintf("%s: %s", message, strerror(save_errno));
4518 write_logs(host, message, sx->first_addr ? sx->first_addr->basic_errno : 0);
4520 *message_defer = TRUE;
4523 DEBUG(D_transport) if (sx->cctx.sock >= 0)
4526 if (ioctl(sx->cctx.sock, TIOCOUTQ, &n) == 0)
4527 debug_printf("%d bytes remain in socket output buffer\n", n);
4531 /* Otherwise, we have an I/O error or a timeout other than after MAIL or
4532 ".", or some other transportation error. We defer all addresses and yield
4533 DEFER, except for the case of failed add_headers expansion, or a transport
4534 filter failure, when the yield should be ERROR, to stop it trying other
4539 #ifndef DISABLE_PIPE_CONNECT
4540 /* If we were early-pipelinng and the actual EHLO response did not match
4541 the cached value we assumed, we could have detected it and passed a
4542 custom errno through to here. It would be nice to RSET and retry right
4543 away, but to reliably do that we eould need an extra synch point before
4544 we committed to data and that would discard half the gained roundrips.
4545 Or we could summarily drop the TCP connection. but that is also ugly.
4546 Instead, we ignore the possibility (having freshened the cache) and rely
4547 on the server telling us with a nonmessage error if we have tried to
4548 do something it no longer supports. */
4551 yield = (save_errno == ERRNO_CHHEADER_FAIL ||
4552 save_errno == ERRNO_FILTER_FAIL) ? ERROR : DEFER;
4556 set_errno(addrlist, save_errno, set_message, set_rc, pass_message, host,
4557 #ifdef EXPERIMENTAL_DSN_INFO
4558 sx->smtp_greeting, sx->helo_response,
4560 &sx->delivery_start);
4563 /* If all has gone well, send_quit will be set TRUE, implying we can end the
4564 SMTP session tidily. However, if there were too many addresses to send in one
4565 message (indicated by first_addr being non-NULL) we want to carry on with the
4566 rest of them. Also, it is desirable to send more than one message down the SMTP
4567 connection if there are several waiting, provided we haven't already sent so
4568 many as to hit the configured limit. The function transport_check_waiting looks
4569 for a waiting message and returns its id. Then transport_pass_socket tries to
4570 set up a continued delivery by passing the socket on to another process. The
4571 variable send_rset is FALSE if a message has just been successfully transferred.
4573 If we are already sending down a continued channel, there may be further
4574 addresses not yet delivered that are aimed at the same host, but which have not
4575 been passed in this run of the transport. In this case, continue_more will be
4576 true, and all we should do is send RSET if necessary, and return, leaving the
4579 However, if no address was disposed of, i.e. all addresses got 4xx errors, we
4580 do not want to continue with other messages down the same channel, because that
4581 can lead to looping between two or more messages, all with the same,
4582 temporarily failing address(es). [The retry information isn't updated yet, so
4583 new processes keep on trying.] We probably also don't want to try more of this
4584 message's addresses either.
4586 If we have started a TLS session, we have to end it before passing the
4587 connection to a new process. However, not all servers can handle this (Exim
4588 can), so we do not pass such a connection on if the host matches
4589 hosts_nopass_tls. */
4592 debug_printf("ok=%d send_quit=%d send_rset=%d continue_more=%d "
4593 "yield=%d first_address is %sNULL\n", sx->ok, sx->send_quit,
4594 sx->send_rset, f.continue_more, yield, sx->first_addr ? "not " : "");
4596 if (sx->completed_addr && sx->ok && sx->send_quit)
4597 #ifdef EXPERIMENTAL_ESMTP_LIMITS
4598 if (mail_limit = continue_sequence >= sx->max_mail)
4601 debug_printf("reached limit %u for MAILs per conn\n", sx->max_mail);
4606 smtp_compare_t t_compare =
4607 {.tblock = tblock, .current_sender_address = sender_address};
4609 if ( sx->first_addr /* more addrs for this message */
4610 || f.continue_more /* more addrs for continued-host */
4611 || tcw_done && tcw /* more messages for host */
4614 ( tls_out.active.sock < 0 && !continue_proxy_cipher
4615 || verify_check_given_host(CUSS &ob->hosts_nopass_tls, host) != OK
4619 transport_check_waiting(tblock->name, host->name,
4620 sx->max_mail, new_message_id,
4621 (oicf)smtp_are_same_identities, (void*)&t_compare)
4628 if (! (sx->ok = smtp_write_command(sx, SCMD_FLUSH, "RSET\r\n") >= 0))
4630 msg = US string_sprintf("smtp send to %s [%s] failed: %s", host->name,
4631 host->address, strerror(errno));
4632 sx->send_quit = FALSE;
4634 else if (! (sx->ok = smtp_read_response(sx, sx->buffer, sizeof(sx->buffer),
4635 '2', ob->command_timeout)))
4638 sx->send_quit = check_response(host, &errno, 0, sx->buffer, &code, &msg,
4642 DEBUG(D_transport) debug_printf("H=%s [%s] %s\n",
4643 host->name, host->address, msg);
4647 /* Either RSET was not needed, or it succeeded */
4654 int socket_fd = sx->cctx.sock;
4656 if (sx->first_addr) /* More addresses still to be sent */
4657 { /* for this message */
4658 #ifdef EXPERIMENTAL_ESMTP_LIMITS
4659 /* Any that we marked as skipped, reset to do now */
4660 for (address_item * a = sx->first_addr; a; a = a->next)
4661 if (a->transport_return == SKIP)
4662 a->transport_return = PENDING_DEFER;
4664 continue_sequence++; /* for consistency */
4665 clearflag(sx->first_addr, af_new_conn);
4666 setflag(sx->first_addr, af_cont_conn); /* Causes * in logging */
4667 pipelining_active = sx->pipelining_used; /* was cleared at DATA */
4671 /* Unless caller said it already has more messages listed for this host,
4672 pass the connection on to a new Exim process (below, the call to
4673 transport_pass_socket). If the caller has more ready, just return with
4674 the connection still open. */
4677 if (tls_out.active.sock >= 0)
4678 if ( f.continue_more
4679 || verify_check_given_host(CUSS &ob->hosts_noproxy_tls, host) == OK)
4681 /* Before passing the socket on, or returning to caller with it still
4682 open, we must shut down TLS. Not all MTAs allow for the continuation
4683 of the SMTP session when TLS is shut down. We test for this by sending
4684 a new EHLO. If we don't get a good response, we don't attempt to pass
4687 tls_close(sx->cctx.tls_ctx,
4688 sx->send_tlsclose ? TLS_SHUTDOWN_WAIT : TLS_SHUTDOWN_WONLY);
4689 sx->send_tlsclose = FALSE;
4690 sx->cctx.tls_ctx = NULL;
4691 tls_out.active.sock = -1;
4692 smtp_peer_options = smtp_peer_options_wrap;
4694 && smtp_write_command(sx, SCMD_FLUSH, "EHLO %s\r\n", sx->helo_data)
4696 && smtp_read_response(sx, sx->buffer, sizeof(sx->buffer),
4697 '2', ob->command_timeout);
4699 if (sx->ok && f.continue_more)
4700 goto TIDYUP; /* More addresses for another run */
4704 /* Set up a pipe for proxying TLS for the new transport process */
4706 smtp_peer_options |= OPTION_TLS;
4707 if ((sx->ok = socketpair(AF_UNIX, SOCK_STREAM, 0, pfd) == 0))
4710 set_errno(sx->first_addr, errno, US"internal allocation problem",
4712 # ifdef EXPERIMENTAL_DSN_INFO
4713 sx->smtp_greeting, sx->helo_response,
4715 &sx->delivery_start);
4719 if (f.continue_more)
4720 goto TIDYUP; /* More addresses for another run */
4722 /* If the socket is successfully passed, we mustn't send QUIT (or
4723 indeed anything!) from here. */
4725 /*XXX DSN_INFO: assume likely to do new HELO; but for greet we'll want to
4726 propagate it from the initial
4728 if (sx->ok && transport_pass_socket(tblock->name, host->name,
4729 host->address, new_message_id, socket_fd
4730 #ifdef EXPERIMENTAL_ESMTP_LIMITS
4731 , sx->peer_limit_mail, sx->peer_limit_rcpt, sx->peer_limit_rcptdom
4735 sx->send_quit = FALSE;
4737 /* We have passed the client socket to a fresh transport process.
4738 If TLS is still active, we need to proxy it for the transport we
4739 just passed the baton to. Fork a child to to do it, and return to
4740 get logging done asap. Which way to place the work makes assumptions
4741 about post-fork prioritisation which may not hold on all platforms. */
4743 if (tls_out.active.sock >= 0)
4745 int pid = exim_fork(US"tls-proxy-interproc");
4746 if (pid == 0) /* child; fork again to disconnect totally */
4748 /* does not return */
4749 smtp_proxy_tls(sx->cctx.tls_ctx, sx->buffer, sizeof(sx->buffer), pfd,
4750 ob->command_timeout, host->name);
4753 if (pid > 0) /* parent */
4756 /* tidy the inter-proc to disconn the proxy proc */
4757 waitpid(pid, NULL, 0);
4758 tls_close(sx->cctx.tls_ctx, TLS_NO_SHUTDOWN);
4759 sx->cctx.tls_ctx = NULL;
4760 (void)close(sx->cctx.sock);
4762 continue_transport = NULL;
4763 continue_hostname = NULL;
4766 log_write(0, LOG_PANIC_DIE, "fork failed");
4772 /* If RSET failed and there are addresses left, they get deferred. */
4774 set_errno(sx->first_addr, errno, msg, DEFER, FALSE, host,
4775 #ifdef EXPERIMENTAL_DSN_INFO
4776 sx->smtp_greeting, sx->helo_response,
4778 &sx->delivery_start);
4782 /* End off tidily with QUIT unless the connection has died or the socket has
4783 been passed to another process. */
4787 { /* Use _MORE to get QUIT in FIN segment */
4788 (void)smtp_write_command(sx, SCMD_MORE, "QUIT\r\n");
4790 if (sx->cctx.tls_ctx && sx->send_tlsclose)
4792 # ifdef EXIM_TCP_CORK /* Use _CORK to get TLS Close Notify in FIN segment */
4793 (void) setsockopt(sx->cctx.sock, IPPROTO_TCP, EXIM_TCP_CORK, US &on, sizeof(on));
4795 tls_shutdown_wr(sx->cctx.tls_ctx);
4796 sx->send_tlsclose = FALSE;
4803 /* Close the socket, and return the appropriate value, first setting
4804 works because the NULL setting is passed back to the calling process, and
4805 remote_max_parallel is forced to 1 when delivering over an existing connection,
4807 If all went well and continue_more is set, we shouldn't actually get here if
4808 there are further addresses, as the return above will be taken. However,
4809 writing RSET might have failed, or there may be other addresses whose hosts are
4810 specified in the transports, and therefore not visible at top level, in which
4811 case continue_more won't get set. */
4815 /* This flushes data queued in the socket, being the QUIT and any TLS Close,
4816 sending them along with the client FIN flag. Us (we hope) sending FIN first
4817 means we (client) take the TIME_WAIT state, so the server (which likely has a
4818 higher connection rate) does not have to. */
4820 HDEBUG(D_transport|D_acl|D_v) debug_printf_indent(" SMTP(shutdown)>>\n");
4821 shutdown(sx->cctx.sock, SHUT_WR);
4824 if (sx->send_quit || tcw_done && !tcw)
4826 /* Wait for (we hope) ack of our QUIT, and a server FIN. Discard any data
4827 received, then discard the socket. Any packet received after then, or receive
4828 data still in the socket, will get a RST - hence the pause/drain. */
4830 /* Reap the response to QUIT, timing out after one second */
4831 (void) smtp_read_response(sx, sx->buffer, sizeof(sx->buffer), '2', 1);
4833 if (sx->cctx.tls_ctx)
4837 /* Reap the TLS Close Notify from the server, timing out after one second */
4838 sigalrm_seen = FALSE;
4841 n = tls_read(sx->cctx.tls_ctx, sx->inbuffer, sizeof(sx->inbuffer));
4842 while (!sigalrm_seen && n > 0);
4845 if (sx->send_tlsclose)
4847 # ifdef EXIM_TCP_CORK
4848 (void) setsockopt(sx->cctx.sock, IPPROTO_TCP, EXIM_TCP_CORK, US &on, sizeof(on));
4850 tls_close(sx->cctx.tls_ctx, TLS_SHUTDOWN_WAIT);
4853 tls_close(sx->cctx.tls_ctx, TLS_SHUTDOWN_WONLY);
4854 sx->cctx.tls_ctx = NULL;
4858 /* Drain any trailing data from the socket before close, to avoid sending a RST */
4860 if ( poll_one_fd(sx->cctx.sock, POLLIN, 20) != 0 /* 20ms */
4861 && fcntl(sx->cctx.sock, F_SETFL, O_NONBLOCK) == 0)
4862 for (int i = 16, n; /* drain socket */
4863 (n = read(sx->cctx.sock, sx->inbuffer, sizeof(sx->inbuffer))) > 0 && i > 0;
4864 i--) HDEBUG(D_transport|D_acl|D_v)
4867 debug_printf_indent(" SMTP(drain %d bytes)<< %.*s\n", n, m, sx->inbuffer);
4868 for (m = 0; m < n; m++)
4869 debug_printf("0x%02x\n", sx->inbuffer[m]);
4872 HDEBUG(D_transport|D_acl|D_v) debug_printf_indent(" SMTP(close)>>\n");
4873 (void)close(sx->cctx.sock);
4875 continue_transport = NULL;
4876 continue_hostname = NULL;
4877 smtp_debug_cmd_report();
4879 #ifndef DISABLE_EVENT
4880 (void) event_raise(tblock->event_action, US"tcp:close", NULL, NULL);
4886 sx->first_addr = NULL;
4887 for (address_item * a = sx->addrlist->next; a; a = a->next)
4888 if (a->transport_return == DANE)
4890 a->transport_return = PENDING_DEFER;
4891 if (!sx->first_addr)
4893 /* Remember the new start-point in the addrlist, for smtp_setup_conn()
4894 to get the domain string for SNI */
4897 clearflag(a, af_cont_conn);
4898 setflag(a, af_new_conn); /* clear * from logging */
4899 DEBUG(D_transport) debug_printf("DANE: go-around for %s\n", a->domain);
4902 continue_sequence = 1; /* for consistency */
4907 #ifdef EXPERIMENTAL_ESMTP_LIMITS
4908 if (mail_limit && sx->first_addr)
4910 /* Reset the sequence count since we closed the connection. This is flagged
4911 on the pipe back to the delivery process so that a non-continued-conn delivery
4914 continue_sequence = 1; /* for consistency */
4915 clearflag(sx->first_addr, af_cont_conn);
4916 setflag(sx->first_addr, af_new_conn); /* clear * from logging */
4925 if (dane_held) for (address_item * a = sx->addrlist->next; a; a = a->next)
4926 if (a->transport_return == DANE)
4927 a->transport_return = PENDING_DEFER;
4935 /*************************************************
4936 * Closedown entry point *
4937 *************************************************/
4939 /* This function is called when exim is passed an open smtp channel
4940 from another incarnation, but the message which it has been asked
4941 to deliver no longer exists. The channel is on stdin.
4943 We might do fancy things like looking for another message to send down
4944 the channel, but if the one we sought has gone, it has probably been
4945 delivered by some other process that itself will seek further messages,
4946 so just close down our connection.
4948 Argument: pointer to the transport instance block
4953 smtp_transport_closedown(transport_instance *tblock)
4955 smtp_transport_options_block * ob = SOB tblock->options_block;
4956 client_conn_ctx cctx;
4959 uschar inbuffer[4096];
4960 uschar outbuffer[16];
4962 /*XXX really we need an active-smtp-client ctx, rather than assuming stdout */
4963 cctx.sock = fileno(stdin);
4964 cctx.tls_ctx = cctx.sock == tls_out.active.sock ? tls_out.active.tls_ctx : NULL;
4966 sx.inblock.cctx = &cctx;
4967 sx.inblock.buffer = inbuffer;
4968 sx.inblock.buffersize = sizeof(inbuffer);
4969 sx.inblock.ptr = inbuffer;
4970 sx.inblock.ptrend = inbuffer;
4972 sx.outblock.cctx = &cctx;
4973 sx.outblock.buffersize = sizeof(outbuffer);
4974 sx.outblock.buffer = outbuffer;
4975 sx.outblock.ptr = outbuffer;
4976 sx.outblock.cmd_count = 0;
4977 sx.outblock.authenticating = FALSE;
4979 (void)smtp_write_command(&sx, SCMD_FLUSH, "QUIT\r\n");
4980 (void)smtp_read_response(&sx, buffer, sizeof(buffer), '2', ob->command_timeout);
4981 (void)close(cctx.sock);
4986 /*************************************************
4987 * Prepare addresses for delivery *
4988 *************************************************/
4990 /* This function is called to flush out error settings from previous delivery
4991 attempts to other hosts. It also records whether we got here via an MX record
4992 or not in the more_errno field of the address. We are interested only in
4993 addresses that are still marked DEFER - others may have got delivered to a
4994 previously considered IP address. Set their status to PENDING_DEFER to indicate
4995 which ones are relevant this time.
4998 addrlist the list of addresses
4999 host the host we are delivering to
5001 Returns: the first address for this delivery
5004 static address_item *
5005 prepare_addresses(address_item *addrlist, host_item *host)
5007 address_item *first_addr = NULL;
5008 for (address_item * addr = addrlist; addr; addr = addr->next)
5009 if (addr->transport_return == DEFER)
5011 if (!first_addr) first_addr = addr;
5012 addr->transport_return = PENDING_DEFER;
5013 addr->basic_errno = 0;
5014 addr->more_errno = (host->mx >= 0)? 'M' : 'A';
5015 addr->message = NULL;
5017 addr->cipher = NULL;
5018 addr->ourcert = NULL;
5019 addr->peercert = NULL;
5020 addr->peerdn = NULL;
5021 addr->ocsp = OCSP_NOT_REQ;
5022 addr->tlsver = NULL;
5024 #ifdef EXPERIMENTAL_DSN_INFO
5025 addr->smtp_greeting = NULL;
5026 addr->helo_response = NULL;
5034 /*************************************************
5035 * Main entry point *
5036 *************************************************/
5038 /* See local README for interface details. As this is a remote transport, it is
5039 given a chain of addresses to be delivered in one connection, if possible. It
5040 always returns TRUE, indicating that each address has its own independent
5041 status set, except if there is a setting up problem, in which case it returns
5045 smtp_transport_entry(
5046 transport_instance *tblock, /* data for this instantiation */
5047 address_item *addrlist) /* addresses we are working on */
5050 int hosts_defer = 0;
5052 int hosts_looked_up = 0;
5053 int hosts_retry = 0;
5054 int hosts_serial = 0;
5055 int hosts_total = 0;
5056 int total_hosts_tried = 0;
5057 BOOL expired = TRUE;
5058 uschar *expanded_hosts = NULL;
5060 uschar *tid = string_sprintf("%s transport", tblock->name);
5061 smtp_transport_options_block *ob = SOB tblock->options_block;
5062 host_item *hostlist = addrlist->host_list;
5063 host_item *host = NULL;
5067 debug_printf("%s transport entered\n", tblock->name);
5068 for (address_item * addr = addrlist; addr; addr = addr->next)
5069 debug_printf(" %s\n", addr->address);
5072 debug_printf("hostlist:\n");
5073 for (host_item * host = hostlist; host; host = host->next)
5074 debug_printf(" '%s' IP %s port %d\n", host->name, host->address, host->port);
5076 if (continue_hostname)
5077 debug_printf("already connected to %s [%s] (on fd %d)\n",
5078 continue_hostname, continue_host_address,
5079 cutthrough.cctx.sock >= 0 ? cutthrough.cctx.sock : 0);
5082 /* Check the restrictions on line length */
5084 if (max_received_linelength > ob->message_linelength_limit)
5087 gettimeofday(&now, NULL);
5089 for (address_item * addr = addrlist; addr; addr = addr->next)
5090 if (addr->transport_return == DEFER)
5091 addr->transport_return = PENDING_DEFER;
5093 set_errno_nohost(addrlist, ERRNO_SMTPFORMAT,
5094 US"message has lines too long for transport", FAIL, TRUE, &now);
5098 /* Set the flag requesting that these hosts be added to the waiting
5099 database if the delivery fails temporarily or if we are running with
5100 queue_smtp or a 2-stage queue run. This gets unset for certain
5101 kinds of error, typically those that are specific to the message. */
5103 update_waiting = TRUE;
5105 /* If a host list is not defined for the addresses - they must all have the
5106 same one in order to be passed to a single transport - or if the transport has
5107 a host list with hosts_override set, use the host list supplied with the
5108 transport. It is an error for this not to exist. */
5110 if (!hostlist || (ob->hosts_override && ob->hosts))
5114 addrlist->message = string_sprintf("%s transport called with no hosts set",
5116 addrlist->transport_return = PANIC;
5117 return FALSE; /* Only top address has status */
5120 DEBUG(D_transport) debug_printf("using the transport's hosts: %s\n",
5123 /* If the transport's host list contains no '$' characters, and we are not
5124 randomizing, it is fixed and therefore a chain of hosts can be built once
5125 and for all, and remembered for subsequent use by other calls to this
5126 transport. If, on the other hand, the host list does contain '$', or we are
5127 randomizing its order, we have to rebuild it each time. In the fixed case,
5128 as the hosts string will never be used again, it doesn't matter that we
5129 replace all the : characters with zeros. */
5133 uschar *s = ob->hosts;
5135 if (Ustrchr(s, '$'))
5137 if (!(expanded_hosts = expand_string(s)))
5139 addrlist->message = string_sprintf("failed to expand list of hosts "
5140 "\"%s\" in %s transport: %s", s, tblock->name, expand_string_message);
5141 addrlist->transport_return = f.search_find_defer ? DEFER : PANIC;
5142 return FALSE; /* Only top address has status */
5144 DEBUG(D_transport) debug_printf("expanded list of hosts \"%s\" to "
5145 "\"%s\"\n", s, expanded_hosts);
5149 if (ob->hosts_randomize) s = expanded_hosts = string_copy(s);
5153 log_write(0, LOG_MAIN|LOG_PANIC,
5154 "attempt to use tainted host list '%s' from '%s' in transport %s",
5155 s, ob->hosts, tblock->name);
5156 /* Avoid leaking info to an attacker */
5157 addrlist->message = US"internal configuration error";
5158 addrlist->transport_return = PANIC;
5162 host_build_hostlist(&hostlist, s, ob->hosts_randomize);
5164 /* Check that the expansion yielded something useful. */
5168 string_sprintf("%s transport has empty hosts setting", tblock->name);
5169 addrlist->transport_return = PANIC;
5170 return FALSE; /* Only top address has status */
5173 /* If there was no expansion of hosts, save the host list for
5176 if (!expanded_hosts) ob->hostlist = hostlist;
5179 /* This is not the first time this transport has been run in this delivery;
5180 the host list was built previously. */
5183 hostlist = ob->hostlist;
5186 /* The host list was supplied with the address. If hosts_randomize is set, we
5187 must sort it into a random order if it did not come from MX records and has not
5188 already been randomized (but don't bother if continuing down an existing
5191 else if (ob->hosts_randomize && hostlist->mx == MX_NONE && !continue_hostname)
5193 host_item *newlist = NULL;
5196 host_item *h = hostlist;
5197 hostlist = hostlist->next;
5199 h->sort_key = random_number(100);
5206 else if (h->sort_key < newlist->sort_key)
5213 host_item *hh = newlist;
5216 if (h->sort_key < hh->next->sort_key) break;
5224 hostlist = addrlist->host_list = newlist;
5227 /* Sort out the default port. */
5229 if (!smtp_get_port(ob->port, addrlist, &defport, tid)) return FALSE;
5231 /* For each host-plus-IP-address on the list:
5233 . If this is a continued delivery and the host isn't the one with the
5234 current connection, skip.
5236 . If the status is unusable (i.e. previously failed or retry checked), skip.
5238 . If no IP address set, get the address, either by turning the name into
5239 an address, calling gethostbyname if gethostbyname is on, or by calling
5240 the DNS. The DNS may yield multiple addresses, in which case insert the
5241 extra ones into the list.
5243 . Get the retry data if not previously obtained for this address and set the
5244 field which remembers the state of this address. Skip if the retry time is
5245 not reached. If not, remember whether retry data was found. The retry string
5246 contains both the name and the IP address.
5248 . Scan the list of addresses and mark those whose status is DEFER as
5249 PENDING_DEFER. These are the only ones that will be processed in this cycle
5252 . Make a delivery attempt - addresses marked PENDING_DEFER will be tried.
5253 Some addresses may be successfully delivered, others may fail, and yet
5254 others may get temporary errors and so get marked DEFER.
5256 . The return from the delivery attempt is OK if a connection was made and a
5257 valid SMTP dialogue was completed. Otherwise it is DEFER.
5259 . If OK, add a "remove" retry item for this host/IPaddress, if any.
5261 . If fail to connect, or other defer state, add a retry item.
5263 . If there are any addresses whose status is still DEFER, carry on to the
5264 next host/IPaddress, unless we have tried the number of hosts given
5265 by hosts_max_try or hosts_max_try_hardlimit; otherwise return. Note that
5266 there is some fancy logic for hosts_max_try that means its limit can be
5267 overstepped in some circumstances.
5269 If we get to the end of the list, all hosts have deferred at least one address,
5270 or not reached their retry times. If delay_after_cutoff is unset, it requests a
5271 delivery attempt to those hosts whose last try was before the arrival time of
5272 the current message. To cope with this, we have to go round the loop a second
5273 time. After that, set the status and error data for any addresses that haven't
5274 had it set already. */
5276 for (int cutoff_retry = 0;
5277 expired && cutoff_retry < (ob->delay_after_cutoff ? 1 : 2);
5280 host_item *nexthost = NULL;
5281 int unexpired_hosts_tried = 0;
5282 BOOL continue_host_tried = FALSE;
5284 retry_non_continued:
5285 for (host = hostlist;
5287 && unexpired_hosts_tried < ob->hosts_max_try
5288 && total_hosts_tried < ob->hosts_max_try_hardlimit;
5293 BOOL host_is_expired = FALSE;
5294 BOOL message_defer = FALSE;
5295 BOOL some_deferred = FALSE;
5296 address_item *first_addr = NULL;
5297 uschar *interface = NULL;
5298 uschar *retry_host_key = NULL;
5299 uschar *retry_message_key = NULL;
5300 uschar *serialize_key = NULL;
5302 /* Default next host is next host. :-) But this can vary if the
5303 hosts_max_try limit is hit (see below). It may also be reset if a host
5304 address is looked up here (in case the host was multihomed). */
5306 nexthost = host->next;
5308 /* If the address hasn't yet been obtained from the host name, look it up
5309 now, unless the host is already marked as unusable. If it is marked as
5310 unusable, it means that the router was unable to find its IP address (in
5311 the DNS or wherever) OR we are in the 2nd time round the cutoff loop, and
5312 the lookup failed last time. We don't get this far if *all* MX records
5313 point to non-existent hosts; that is treated as a hard error.
5315 We can just skip this host entirely. When the hosts came from the router,
5316 the address will timeout based on the other host(s); when the address is
5317 looked up below, there is an explicit retry record added.
5319 Note that we mustn't skip unusable hosts if the address is not unset; they
5320 may be needed as expired hosts on the 2nd time round the cutoff loop. */
5324 int new_port, flags;
5326 if (host->status >= hstatus_unusable)
5328 DEBUG(D_transport) debug_printf("%s has no address and is unusable - skipping\n",
5333 DEBUG(D_transport) debug_printf("getting address for %s\n", host->name);
5335 /* The host name is permitted to have an attached port. Find it, and
5336 strip it from the name. Just remember it for now. */
5338 new_port = host_item_get_port(host);
5340 /* Count hosts looked up */
5344 /* Find by name if so configured, or if it's an IP address. We don't
5345 just copy the IP address, because we need the test-for-local to happen. */
5347 flags = HOST_FIND_BY_A | HOST_FIND_BY_AAAA;
5348 if (ob->dns_qualify_single) flags |= HOST_FIND_QUALIFY_SINGLE;
5349 if (ob->dns_search_parents) flags |= HOST_FIND_SEARCH_PARENTS;
5351 if (ob->gethostbyname || string_is_ip_address(host->name, NULL) != 0)
5352 rc = host_find_byname(host, NULL, flags, NULL, TRUE);
5354 rc = host_find_bydns(host, NULL, flags, NULL, NULL, NULL,
5355 &ob->dnssec, /* domains for request/require */
5358 /* Update the host (and any additional blocks, resulting from
5359 multihoming) with a host-specific port, if any. */
5361 for (host_item * hh = host; hh != nexthost; hh = hh->next) hh->port = new_port;
5363 /* Failure to find the host at this time (usually DNS temporary failure)
5364 is really a kind of routing failure rather than a transport failure.
5365 Therefore we add a retry item of the routing kind, not to stop us trying
5366 to look this name up here again, but to ensure the address gets timed
5367 out if the failures go on long enough. A complete failure at this point
5368 commonly points to a configuration error, but the best action is still
5369 to carry on for the next host. */
5371 if (rc == HOST_FIND_AGAIN || rc == HOST_FIND_SECURITY || rc == HOST_FIND_FAILED)
5373 retry_add_item(addrlist, string_sprintf("R:%s", host->name), 0);
5375 if (rc == HOST_FIND_AGAIN) hosts_defer++; else hosts_fail++;
5376 DEBUG(D_transport) debug_printf("rc = %s for %s\n", (rc == HOST_FIND_AGAIN)?
5377 "HOST_FIND_AGAIN" : "HOST_FIND_FAILED", host->name);
5378 host->status = hstatus_unusable;
5380 for (address_item * addr = addrlist; addr; addr = addr->next)
5382 if (addr->transport_return != DEFER) continue;
5383 addr->basic_errno = ERRNO_UNKNOWNHOST;
5384 addr->message = string_sprintf(
5385 rc == HOST_FIND_SECURITY
5386 ? "lookup of IP address for %s was insecure"
5387 : "failed to lookup IP address for %s",
5393 /* If the host is actually the local host, we may have a problem, or
5394 there may be some cunning configuration going on. In the problem case,
5395 log things and give up. The default transport status is already DEFER. */
5397 if (rc == HOST_FOUND_LOCAL && !ob->allow_localhost)
5399 for (address_item * addr = addrlist; addr; addr = addr->next)
5401 addr->basic_errno = ERRNO_HOST_IS_LOCAL;
5402 addr->message = string_sprintf("%s transport found host %s to be "
5403 "local", tblock->name, host->name);
5407 } /* End of block for IP address lookup */
5409 /* If this is a continued delivery, we are interested only in the host
5410 which matches the name of the existing open channel. The check is put
5411 here after the local host lookup, in case the name gets expanded as a
5412 result of the lookup. Set expired FALSE, to save the outer loop executing
5415 if (continue_hostname)
5416 if ( Ustrcmp(continue_hostname, host->name) != 0
5417 || Ustrcmp(continue_host_address, host->address) != 0
5421 continue; /* With next host */
5424 continue_host_tried = TRUE;
5426 /* Reset the default next host in case a multihomed host whose addresses
5427 are not looked up till just above added to the host list. */
5429 nexthost = host->next;
5431 /* If queue_smtp is set (-odqs or the first part of a 2-stage run), or the
5432 domain is in queue_smtp_domains, we don't actually want to attempt any
5433 deliveries. When doing a queue run, queue_smtp_domains is always unset. If
5434 there is a lookup defer in queue_smtp_domains, proceed as if the domain
5435 were not in it. We don't want to hold up all SMTP deliveries! Except when
5436 doing a two-stage queue run, don't do this if forcing. */
5438 if ( (!f.deliver_force || f.queue_2stage)
5440 || match_isinlist(addrlist->domain,
5441 CUSS &queue_smtp_domains, 0,
5442 &domainlist_anchor, NULL, MCL_DOMAIN, TRUE, NULL) == OK)
5445 DEBUG(D_transport) debug_printf("first-pass routing only\n");
5447 for (address_item * addr = addrlist; addr; addr = addr->next)
5448 if (addr->transport_return == DEFER)
5449 addr->message = US"first-pass only routing due to -odqs, "
5450 "queue_smtp_domains or control=queue";
5451 continue; /* With next host */
5454 /* Count hosts being considered - purely for an intelligent comment
5455 if none are usable. */
5459 /* Set $host and $host address now in case they are needed for the
5460 interface expansion or the serialize_hosts check; they remain set if an
5461 actual delivery happens. */
5463 deliver_host = host->name;
5464 deliver_host_address = host->address;
5465 lookup_dnssec_authenticated = host->dnssec == DS_YES ? US"yes"
5466 : host->dnssec == DS_NO ? US"no"
5469 /* Set up a string for adding to the retry key if the port number is not
5470 the standard SMTP port. A host may have its own port setting that overrides
5473 pistring = string_sprintf(":%d", host->port == PORT_NONE
5474 ? defport : host->port);
5475 if (Ustrcmp(pistring, ":25") == 0) pistring = US"";
5477 /* Select IPv4 or IPv6, and choose an outgoing interface. If the interface
5478 string is set, even if constant (as different transports can have different
5479 constant settings), we must add it to the key that is used for retries,
5480 because connections to the same host from a different interface should be
5481 treated separately. */
5483 host_af = Ustrchr(host->address, ':') ? AF_INET6 : AF_INET;
5485 uschar * s = ob->interface;
5488 if (!smtp_get_interface(s, host_af, addrlist, &interface, tid))
5490 pistring = string_sprintf("%s/%s", pistring, interface);
5494 /* The first time round the outer loop, check the status of the host by
5495 inspecting the retry data. The second time round, we are interested only
5496 in expired hosts that haven't been tried since this message arrived. */
5498 if (cutoff_retry == 0)
5501 /* Ensure the status of the address is set by checking retry data if
5502 necessary. There may be host-specific retry data (applicable to all
5503 messages) and also data for retries of a specific message at this host.
5504 If either of these retry records are actually read, the keys used are
5505 returned to save recomputing them later. */
5507 if (exp_bool(addrlist, US"transport", tblock->name, D_transport,
5508 US"retry_include_ip_address", ob->retry_include_ip_address,
5509 ob->expand_retry_include_ip_address, &incl_ip) != OK)
5510 continue; /* with next host */
5512 host_is_expired = retry_check_address(addrlist->domain, host, pistring,
5513 incl_ip, &retry_host_key, &retry_message_key);
5515 DEBUG(D_transport) debug_printf("%s [%s]%s retry-status = %s\n", host->name,
5516 host->address ? host->address : US"", pistring,
5517 host->status == hstatus_usable ? "usable"
5518 : host->status == hstatus_unusable ? "unusable"
5519 : host->status == hstatus_unusable_expired ? "unusable (expired)" : "?");
5521 /* Skip this address if not usable at this time, noting if it wasn't
5522 actually expired, both locally and in the address. */
5524 switch (host->status)
5526 case hstatus_unusable:
5528 setflag(addrlist, af_retry_skipped);
5531 case hstatus_unusable_expired:
5534 case hwhy_retry: hosts_retry++; break;
5535 case hwhy_failed: hosts_fail++; break;
5537 case hwhy_deferred: hosts_defer++; break;
5540 /* If there was a retry message key, implying that previously there
5541 was a message-specific defer, we don't want to update the list of
5542 messages waiting for these hosts. */
5544 if (retry_message_key) update_waiting = FALSE;
5545 continue; /* With the next host or IP address */
5549 /* Second time round the loop: if the address is set but expired, and
5550 the message is newer than the last try, let it through. */
5555 || host->status != hstatus_unusable_expired
5556 || host->last_try > received_time.tv_sec)
5558 DEBUG(D_transport) debug_printf("trying expired host %s [%s]%s\n",
5559 host->name, host->address, pistring);
5560 host_is_expired = TRUE;
5563 /* Setting "expired=FALSE" doesn't actually mean not all hosts are expired;
5564 it remains TRUE only if all hosts are expired and none are actually tried.
5569 /* If this host is listed as one to which access must be serialized,
5570 see if another Exim process has a connection to it, and if so, skip
5571 this host. If not, update the database to record our connection to it
5572 and remember this for later deletion. Do not do any of this if we are
5573 sending the message down a pre-existing connection. */
5575 if ( !continue_hostname
5576 && verify_check_given_host(CUSS &ob->serialize_hosts, host) == OK)
5578 serialize_key = string_sprintf("host-serialize-%s", host->name);
5579 if (!enq_start(serialize_key, 1))
5582 debug_printf("skipping host %s because another Exim process "
5583 "is connected to it\n", host->name);
5589 /* OK, we have an IP address that is not waiting for its retry time to
5590 arrive (it might be expired) OR (second time round the loop) we have an
5591 expired host that hasn't been tried since the message arrived. Have a go
5592 at delivering the message to it. First prepare the addresses by flushing
5593 out the result of previous attempts, and finding the first address that
5594 is still to be delivered. */
5596 first_addr = prepare_addresses(addrlist, host);
5598 DEBUG(D_transport) debug_printf("delivering %s to %s [%s] (%s%s)\n",
5599 message_id, host->name, host->address, addrlist->address,
5600 addrlist->next ? ", ..." : "");
5602 set_process_info("delivering %s to %s [%s]%s (%s%s)",
5603 message_id, host->name, host->address, pistring, addrlist->address,
5604 addrlist->next ? ", ..." : "");
5606 /* This is not for real; don't do the delivery. If there are
5607 any remaining hosts, list them. */
5612 gettimeofday(&now, NULL);
5613 set_errno_nohost(addrlist, 0, NULL, OK, FALSE, &now);
5614 for (address_item * addr = addrlist; addr; addr = addr->next)
5616 addr->host_used = host;
5617 addr->special_action = '*';
5618 addr->message = US"delivery bypassed by -N option";
5622 debug_printf("*** delivery by %s transport bypassed by -N option\n"
5623 "*** host and remaining hosts:\n", tblock->name);
5624 for (host_item * host2 = host; host2; host2 = host2->next)
5625 debug_printf(" %s [%s]\n", host2->name,
5626 host2->address ? host2->address : US"unset");
5631 /* This is for real. If the host is expired, we don't count it for
5632 hosts_max_retry. This ensures that all hosts must expire before an address
5633 is timed out, unless hosts_max_try_hardlimit (which protects against
5634 lunatic DNS configurations) is reached.
5636 If the host is not expired and we are about to hit the hosts_max_retry
5637 limit, check to see if there is a subsequent hosts with a different MX
5638 value. If so, make that the next host, and don't count this one. This is a
5639 heuristic to make sure that different MXs do get tried. With a normal kind
5640 of retry rule, they would get tried anyway when the earlier hosts were
5641 delayed, but if the domain has a "retry every time" type of rule - as is
5642 often used for the the very large ISPs, that won't happen. */
5647 /* Make a copy of the host if it is local to this invocation
5648 of the transport. */
5652 thost = store_get(sizeof(host_item), GET_UNTAINTED);
5654 thost->name = string_copy(host->name);
5655 thost->address = string_copy(host->address);
5660 if (!host_is_expired && ++unexpired_hosts_tried >= ob->hosts_max_try)
5663 debug_printf("hosts_max_try limit reached with this host\n");
5664 for (host_item * h = host; h; h = h->next) if (h->mx != host->mx)
5667 unexpired_hosts_tried--;
5668 DEBUG(D_transport) debug_printf("however, a higher MX host exists "
5669 "and will be tried\n");
5674 /* Attempt the delivery. */
5676 total_hosts_tried++;
5677 rc = smtp_deliver(addrlist, thost, host_af, defport, interface, tblock,
5678 &message_defer, FALSE);
5681 OK => connection made, each address contains its result;
5682 message_defer is set for message-specific defers (when all
5683 recipients are marked defer)
5684 DEFER => there was a non-message-specific delivery problem;
5685 ERROR => there was a problem setting up the arguments for a filter,
5686 or there was a problem with expanding added headers
5689 /* If the result is not OK, there was a non-message-specific problem.
5690 If the result is DEFER, we need to write to the logs saying what happened
5691 for this particular host, except in the case of authentication and TLS
5692 failures, where the log has already been written. If all hosts defer a
5693 general message is written at the end. */
5695 if (rc == DEFER && first_addr->basic_errno != ERRNO_AUTHFAIL
5696 && first_addr->basic_errno != ERRNO_TLSFAILURE)
5697 write_logs(host, first_addr->message, first_addr->basic_errno);
5699 #ifndef DISABLE_EVENT
5701 deferred_event_raise(first_addr, host, US"msg:host:defer");
5704 /* If STARTTLS was accepted, but there was a failure in setting up the
5705 TLS session (usually a certificate screwup), and the host is not in
5706 hosts_require_tls, and tls_tempfail_tryclear is true, try again, with
5707 TLS forcibly turned off. We have to start from scratch with a new SMTP
5708 connection. That's why the retry is done from here, not from within
5709 smtp_deliver(). [Rejections of STARTTLS itself don't screw up the
5710 session, so the in-clear transmission after those errors, if permitted,
5711 happens inside smtp_deliver().] */
5715 && first_addr->basic_errno == ERRNO_TLSFAILURE
5716 && ob->tls_tempfail_tryclear
5717 && verify_check_given_host(CUSS &ob->hosts_require_tls, host) != OK
5720 log_write(0, LOG_MAIN,
5721 "%s: delivering unencrypted to H=%s [%s] (not in hosts_require_tls)",
5722 first_addr->message, host->name, host->address);
5723 first_addr = prepare_addresses(addrlist, host);
5724 rc = smtp_deliver(addrlist, thost, host_af, defport, interface, tblock,
5725 &message_defer, TRUE);
5726 if (rc == DEFER && first_addr->basic_errno != ERRNO_AUTHFAIL)
5727 write_logs(host, first_addr->message, first_addr->basic_errno);
5728 # ifndef DISABLE_EVENT
5730 deferred_event_raise(first_addr, host, US"msg:host:defer");
5733 #endif /*DISABLE_TLS*/
5735 #ifndef DISABLE_EVENT
5736 /* If the last host gave a defer raise a per-message event */
5739 && unexpired_hosts_tried < ob->hosts_max_try
5740 && total_hosts_tried < ob->hosts_max_try_hardlimit
5742 && (message_defer || rc == DEFER)
5744 deferred_event_raise(first_addr, host, US"msg:defer");
5748 /* Delivery attempt finished */
5750 set_process_info("delivering %s: just tried %s [%s]%s for %s%s: result %s",
5751 message_id, host->name, host->address, pistring, addrlist->address,
5752 addrlist->next ? " (& others)" : "", rc_to_string(rc));
5754 /* Release serialization if set up */
5756 if (serialize_key) enq_end(serialize_key);
5758 /* If the result is DEFER, or if a host retry record is known to exist, we
5759 need to add an item to the retry chain for updating the retry database
5760 at the end of delivery. We only need to add the item to the top address,
5761 of course. Also, if DEFER, we mark the IP address unusable so as to skip it
5762 for any other delivery attempts using the same address. (It is copied into
5763 the unusable tree at the outer level, so even if different address blocks
5764 contain the same address, it still won't get tried again.) */
5766 if (rc == DEFER || retry_host_key)
5768 int delete_flag = rc != DEFER ? rf_delete : 0;
5769 if (!retry_host_key)
5772 if (exp_bool(addrlist, US"transport", tblock->name, D_transport,
5773 US"retry_include_ip_address", ob->retry_include_ip_address,
5774 ob->expand_retry_include_ip_address, &incl_ip) != OK)
5775 incl_ip = TRUE; /* error; use most-specific retry record */
5777 retry_host_key = incl_ip
5778 ? string_sprintf("T:%S:%s%s", host->name, host->address, pistring)
5779 : string_sprintf("T:%S%s", host->name, pistring);
5782 /* If a delivery of another message over an existing SMTP connection
5783 yields DEFER, we do NOT set up retry data for the host. This covers the
5784 case when there are delays in routing the addresses in the second message
5785 that are so long that the server times out. This is alleviated by not
5786 routing addresses that previously had routing defers when handling an
5787 existing connection, but even so, this case may occur (e.g. if a
5788 previously happily routed address starts giving routing defers). If the
5789 host is genuinely down, another non-continued message delivery will
5790 notice it soon enough. */
5792 if (delete_flag != 0 || !continue_hostname)
5793 retry_add_item(first_addr, retry_host_key, rf_host | delete_flag);
5795 /* We may have tried an expired host, if its retry time has come; ensure
5796 the status reflects the expiry for the benefit of any other addresses. */
5800 host->status = host_is_expired
5801 ? hstatus_unusable_expired : hstatus_unusable;
5802 host->why = hwhy_deferred;
5806 /* If message_defer is set (host was OK, but every recipient got deferred
5807 because of some message-specific problem), or if that had happened
5808 previously so that a message retry key exists, add an appropriate item
5809 to the retry chain. Note that if there was a message defer but now there is
5810 a host defer, the message defer record gets deleted. That seems perfectly
5811 reasonable. Also, stop the message from being remembered as waiting
5812 for specific hosts. */
5814 if (message_defer || retry_message_key)
5816 int delete_flag = message_defer ? 0 : rf_delete;
5817 if (!retry_message_key)
5820 if (exp_bool(addrlist, US"transport", tblock->name, D_transport,
5821 US"retry_include_ip_address", ob->retry_include_ip_address,
5822 ob->expand_retry_include_ip_address, &incl_ip) != OK)
5823 incl_ip = TRUE; /* error; use most-specific retry record */
5825 retry_message_key = incl_ip
5826 ? string_sprintf("T:%S:%s%s:%s", host->name, host->address, pistring,
5828 : string_sprintf("T:%S%s:%s", host->name, pistring, message_id);
5830 retry_add_item(addrlist, retry_message_key,
5831 rf_message | rf_host | delete_flag);
5832 update_waiting = FALSE;
5835 /* Any return other than DEFER (that is, OK or ERROR) means that the
5836 addresses have got their final statuses filled in for this host. In the OK
5837 case, see if any of them are deferred. */
5840 for (address_item * addr = addrlist; addr; addr = addr->next)
5841 if (addr->transport_return == DEFER)
5843 some_deferred = TRUE;
5847 /* If no addresses deferred or the result was ERROR, return. We do this for
5848 ERROR because a failing filter set-up or add_headers expansion is likely to
5849 fail for any host we try. */
5851 if (rc == ERROR || (rc == OK && !some_deferred))
5853 DEBUG(D_transport) debug_printf("Leaving %s transport\n", tblock->name);
5854 return TRUE; /* Each address has its status */
5857 /* If the result was DEFER or some individual addresses deferred, let
5858 the loop run to try other hosts with the deferred addresses, except for the
5859 case when we were trying to deliver down an existing channel and failed.
5860 Don't try any other hosts in this case. */
5862 if (continue_hostname) break;
5864 /* If the whole delivery, or some individual addresses, were deferred and
5865 there are more hosts that could be tried, do not count this host towards
5866 the hosts_max_try limit if the age of the message is greater than the
5867 maximum retry time for this host. This means we may try try all hosts,
5868 ignoring the limit, when messages have been around for some time. This is
5869 important because if we don't try all hosts, the address will never time
5870 out. NOTE: this does not apply to hosts_max_try_hardlimit. */
5872 if ((rc == DEFER || some_deferred) && nexthost)
5875 retry_config *retry = retry_find_config(host->name, NULL, 0, 0);
5877 if (retry && retry->rules)
5879 retry_rule *last_rule;
5880 for (last_rule = retry->rules;
5882 last_rule = last_rule->next);
5883 timedout = time(NULL) - received_time.tv_sec > last_rule->timeout;
5885 else timedout = TRUE; /* No rule => timed out */
5889 unexpired_hosts_tried--;
5890 DEBUG(D_transport) debug_printf("temporary delivery error(s) override "
5891 "hosts_max_try (message older than host's retry time)\n");
5897 if (unexpired_hosts_tried >= ob->hosts_max_try)
5898 debug_printf("reached transport hosts_max_try limit %d\n",
5900 if (total_hosts_tried >= ob->hosts_max_try_hardlimit)
5901 debug_printf("reached transport hosts_max_try_hardlimit limit %d\n",
5902 ob->hosts_max_try_hardlimit);
5905 testharness_pause_ms(500); /* let server debug out */
5906 } /* End of loop for trying multiple hosts. */
5908 /* If we failed to find a matching host in the list, for an already-open
5909 connection, just close it and start over with the list. This can happen
5910 for routing that changes from run to run, or big multi-IP sites with
5913 if (continue_hostname && !continue_host_tried)
5915 int fd = cutthrough.cctx.sock >= 0 ? cutthrough.cctx.sock : 0;
5917 DEBUG(D_transport) debug_printf("no hosts match already-open connection\n");
5919 /* A TLS conn could be open for a cutthrough, but not for a plain continued-
5921 /*XXX doublecheck that! */
5923 if (cutthrough.cctx.sock >= 0 && cutthrough.is_tls)
5925 (void) tls_write(cutthrough.cctx.tls_ctx, US"QUIT\r\n", 6, FALSE);
5926 tls_close(cutthrough.cctx.tls_ctx, TLS_SHUTDOWN_NOWAIT);
5927 cutthrough.cctx.tls_ctx = NULL;
5928 cutthrough.is_tls = FALSE;
5932 (void) write(fd, US"QUIT\r\n", 6);
5935 cutthrough.cctx.sock = -1;
5936 continue_hostname = NULL;
5937 goto retry_non_continued;
5940 /* This is the end of the loop that repeats iff expired is TRUE and
5941 ob->delay_after_cutoff is FALSE. The second time round we will
5942 try those hosts that haven't been tried since the message arrived. */
5946 debug_printf("all IP addresses skipped or deferred at least one address\n");
5947 if (expired && !ob->delay_after_cutoff && cutoff_retry == 0)
5948 debug_printf("retrying IP addresses not tried since message arrived\n");
5953 /* Get here if all IP addresses are skipped or defer at least one address. In
5954 MUA wrapper mode, this will happen only for connection or other non-message-
5955 specific failures. Force the delivery status for all addresses to FAIL. */
5959 for (address_item * addr = addrlist; addr; addr = addr->next)
5960 addr->transport_return = FAIL;
5964 /* In the normal, non-wrapper case, add a standard message to each deferred
5965 address if there hasn't been an error, that is, if it hasn't actually been
5966 tried this time. The variable "expired" will be FALSE if any deliveries were
5967 actually tried, or if there was at least one host that was not expired. That
5968 is, it is TRUE only if no deliveries were tried and all hosts were expired. If
5969 a delivery has been tried, an error code will be set, and the failing of the
5970 message is handled by the retry code later.
5972 If queue_smtp is set, or this transport was called to send a subsequent message
5973 down an existing TCP/IP connection, and something caused the host not to be
5974 found, we end up here, but can detect these cases and handle them specially. */
5976 for (address_item * addr = addrlist; addr; addr = addr->next)
5978 /* If host is not NULL, it means that we stopped processing the host list
5979 because of hosts_max_try or hosts_max_try_hardlimit. In the former case, this
5980 means we need to behave as if some hosts were skipped because their retry
5981 time had not come. Specifically, this prevents the address from timing out.
5982 However, if we have hit hosts_max_try_hardlimit, we want to behave as if all
5983 hosts were tried. */
5986 if (total_hosts_tried >= ob->hosts_max_try_hardlimit)
5989 debug_printf("hosts_max_try_hardlimit reached: behave as if all "
5990 "hosts were tried\n");
5995 debug_printf("hosts_max_try limit caused some hosts to be skipped\n");
5996 setflag(addr, af_retry_skipped);
5999 if (f.queue_smtp) /* no deliveries attempted */
6001 addr->transport_return = DEFER;
6002 addr->basic_errno = 0;
6003 addr->message = US"SMTP delivery explicitly queued";
6006 else if ( addr->transport_return == DEFER
6007 && (addr->basic_errno == ERRNO_UNKNOWNERROR || addr->basic_errno == 0)
6011 addr->basic_errno = ERRNO_HRETRY;
6012 if (continue_hostname)
6013 addr->message = US"no host found for existing SMTP connection";
6016 setflag(addr, af_pass_message); /* This is not a security risk */
6017 addr->message = string_sprintf(
6018 "all hosts%s have been failing for a long time %s",
6019 addr->domain ? string_sprintf(" for '%s'", addr->domain) : US"",
6020 ob->delay_after_cutoff
6021 ? US"(and retry time not reached)"
6022 : US"and were last tried after this message arrived");
6024 /* If we are already using fallback hosts, or there are no fallback hosts
6025 defined, convert the result to FAIL to cause a bounce. */
6027 if (addr->host_list == addr->fallback_hosts || !addr->fallback_hosts)
6028 addr->transport_return = FAIL;
6033 if (hosts_retry == hosts_total)
6034 s = "retry time not reached for any host%s";
6035 else if (hosts_fail == hosts_total)
6036 s = "all host address lookups%s failed permanently";
6037 else if (hosts_defer == hosts_total)
6038 s = "all host address lookups%s failed temporarily";
6039 else if (hosts_serial == hosts_total)
6040 s = "connection limit reached for all hosts%s";
6041 else if (hosts_fail+hosts_defer == hosts_total)
6042 s = "all host address lookups%s failed";
6044 s = "some host address lookups failed and retry time "
6045 "not reached for other hosts or connection limit reached%s";
6047 addr->message = string_sprintf(s,
6048 addr->domain ? string_sprintf(" for '%s'", addr->domain) : US"");
6053 /* Update the database which keeps information about which messages are waiting
6054 for which hosts to become available. For some message-specific errors, the
6055 update_waiting flag is turned off because we don't want follow-on deliveries in
6056 those cases. If this transport instance is explicitly limited to one message
6057 per connection then follow-on deliveries are not possible and there's no need
6058 to create/update the per-transport wait-<transport_name> database. */
6060 if (update_waiting && tblock->connection_max_messages != 1)
6061 transport_update_waiting(hostlist, tblock->name);
6065 DEBUG(D_transport) debug_printf("Leaving %s transport\n", tblock->name);
6067 return TRUE; /* Each address has its status */
6070 #endif /*!MACRO_PREDEF*/
6073 /* End of transport/smtp.c */