1 /*************************************************
2 * Exim - an Internet mail transport agent *
3 *************************************************/
5 /* Copyright (c) The Exim Maintainers 2020 - 2024 */
6 /* Copyright (c) University of Cambridge 1995 - 2018 */
7 /* See the file NOTICE for conditions of use and distribution. */
8 /* SPDX-License-Identifier: GPL-2.0-or-later */
13 #if defined(SUPPORT_DANE) && defined(DISABLE_TLS)
14 # error TLS is required for DANE
18 /* Options specific to the smtp transport. This transport also supports LMTP
19 over TCP/IP. The options must be in alphabetic order (note that "_" comes
20 before the lower case letters). Some live in the transport_instance block so as
21 to be publicly visible; these are flagged with opt_public. */
23 #define LOFF(field) OPT_OFF(smtp_transport_options_block, field)
25 optionlist smtp_transport_options[] = {
26 { "*expand_multi_domain", opt_stringptr | opt_hidden | opt_public,
27 OPT_OFF(transport_instance, expand_multi_domain) },
28 { "*expand_retry_include_ip_address", opt_stringptr | opt_hidden,
29 LOFF(expand_retry_include_ip_address) },
31 { "address_retry_include_sender", opt_bool,
32 LOFF(address_retry_include_sender) },
33 { "allow_localhost", opt_bool, LOFF(allow_localhost) },
34 #ifdef EXPERIMENTAL_ARC
35 { "arc_sign", opt_stringptr, LOFF(arc_sign) },
37 { "authenticated_sender", opt_stringptr, LOFF(authenticated_sender) },
38 { "authenticated_sender_force", opt_bool, LOFF(authenticated_sender_force) },
39 { "command_timeout", opt_time, LOFF(command_timeout) },
40 { "connect_timeout", opt_time, LOFF(connect_timeout) },
41 { "connection_max_messages", opt_int | opt_public,
42 OPT_OFF(transport_instance, connection_max_messages) },
44 { "dane_require_tls_ciphers", opt_stringptr, LOFF(dane_require_tls_ciphers) },
46 { "data_timeout", opt_time, LOFF(data_timeout) },
47 { "delay_after_cutoff", opt_bool, LOFF(delay_after_cutoff) },
50 { "dkim_canon", opt_stringptr, LOFF(dkim.dkim_canon) },
51 { "dkim_domain", opt_stringptr, LOFF(dkim.dkim_domain) },
52 { "dkim_hash", opt_stringptr, LOFF(dkim.dkim_hash) },
53 { "dkim_identity", opt_stringptr, LOFF(dkim.dkim_identity) },
54 { "dkim_private_key", opt_stringptr, LOFF(dkim.dkim_private_key) },
55 { "dkim_selector", opt_stringptr, LOFF(dkim.dkim_selector) },
56 { "dkim_sign_headers", opt_stringptr, LOFF(dkim.dkim_sign_headers) },
57 { "dkim_strict", opt_stringptr, LOFF(dkim.dkim_strict) },
58 { "dkim_timestamps", opt_stringptr, LOFF(dkim.dkim_timestamps) },
60 { "dns_qualify_single", opt_bool, LOFF(dns_qualify_single) },
61 { "dns_search_parents", opt_bool, LOFF(dns_search_parents) },
62 { "dnssec_request_domains", opt_stringptr, LOFF(dnssec.request) },
63 { "dnssec_require_domains", opt_stringptr, LOFF(dnssec.require) },
64 { "dscp", opt_stringptr, LOFF(dscp) },
65 { "fallback_hosts", opt_stringptr, LOFF(fallback_hosts) },
66 { "final_timeout", opt_time, LOFF(final_timeout) },
67 { "gethostbyname", opt_bool, LOFF(gethostbyname) },
68 { "helo_data", opt_stringptr, LOFF(helo_data) },
69 #if !defined(DISABLE_TLS) && !defined(DISABLE_TLS_RESUME)
70 { "host_name_extract", opt_stringptr, LOFF(host_name_extract) },
72 { "hosts", opt_stringptr, LOFF(hosts) },
73 { "hosts_avoid_esmtp", opt_stringptr, LOFF(hosts_avoid_esmtp) },
74 { "hosts_avoid_pipelining", opt_stringptr, LOFF(hosts_avoid_pipelining) },
76 { "hosts_avoid_tls", opt_stringptr, LOFF(hosts_avoid_tls) },
78 { "hosts_max_try", opt_int, LOFF(hosts_max_try) },
79 { "hosts_max_try_hardlimit", opt_int, LOFF(hosts_max_try_hardlimit) },
81 { "hosts_nopass_tls", opt_stringptr, LOFF(hosts_nopass_tls) },
82 { "hosts_noproxy_tls", opt_stringptr, LOFF(hosts_noproxy_tls) },
84 { "hosts_override", opt_bool, LOFF(hosts_override) },
85 #ifndef DISABLE_PIPE_CONNECT
86 { "hosts_pipe_connect", opt_stringptr, LOFF(hosts_pipe_connect) },
88 { "hosts_randomize", opt_bool, LOFF(hosts_randomize) },
89 #if !defined(DISABLE_TLS) && !defined(DISABLE_OCSP)
90 { "hosts_request_ocsp", opt_stringptr, LOFF(hosts_request_ocsp) },
92 { "hosts_require_alpn", opt_stringptr, LOFF(hosts_require_alpn) },
93 { "hosts_require_auth", opt_stringptr, LOFF(hosts_require_auth) },
96 { "hosts_require_dane", opt_stringptr, LOFF(hosts_require_dane) },
99 { "hosts_require_ocsp", opt_stringptr, LOFF(hosts_require_ocsp) },
101 { "hosts_require_tls", opt_stringptr, LOFF(hosts_require_tls) },
103 { "hosts_try_auth", opt_stringptr, LOFF(hosts_try_auth) },
104 { "hosts_try_chunking", opt_stringptr, LOFF(hosts_try_chunking) },
106 { "hosts_try_dane", opt_stringptr, LOFF(hosts_try_dane) },
108 { "hosts_try_fastopen", opt_stringptr, LOFF(hosts_try_fastopen) },
110 { "hosts_try_prdr", opt_stringptr, LOFF(hosts_try_prdr) },
113 { "hosts_verify_avoid_tls", opt_stringptr, LOFF(hosts_verify_avoid_tls) },
115 { "interface", opt_stringptr, LOFF(interface) },
116 { "keepalive", opt_bool, LOFF(keepalive) },
117 { "lmtp_ignore_quota", opt_bool, LOFF(lmtp_ignore_quota) },
118 { "max_rcpt", opt_stringptr | opt_public,
119 OPT_OFF(transport_instance, max_addresses) },
120 { "message_linelength_limit", opt_int, LOFF(message_linelength_limit) },
121 { "multi_domain", opt_expand_bool | opt_public,
122 OPT_OFF(transport_instance, multi_domain) },
123 { "port", opt_stringptr, LOFF(port) },
124 { "protocol", opt_stringptr, LOFF(protocol) },
125 { "retry_include_ip_address", opt_expand_bool, LOFF(retry_include_ip_address) },
126 { "serialize_hosts", opt_stringptr, LOFF(serialize_hosts) },
127 { "size_addition", opt_int, LOFF(size_addition) },
129 { "socks_proxy", opt_stringptr, LOFF(socks_proxy) },
132 { "tls_alpn", opt_stringptr, LOFF(tls_alpn) },
133 { "tls_certificate", opt_stringptr, LOFF(tls_certificate) },
134 { "tls_crl", opt_stringptr, LOFF(tls_crl) },
135 { "tls_dh_min_bits", opt_int, LOFF(tls_dh_min_bits) },
136 { "tls_privatekey", opt_stringptr, LOFF(tls_privatekey) },
137 { "tls_require_ciphers", opt_stringptr, LOFF(tls_require_ciphers) },
138 # ifndef DISABLE_TLS_RESUME
139 { "tls_resumption_hosts", opt_stringptr, LOFF(tls_resumption_hosts) },
141 { "tls_sni", opt_stringptr, LOFF(tls_sni) },
142 { "tls_tempfail_tryclear", opt_bool, LOFF(tls_tempfail_tryclear) },
143 { "tls_try_verify_hosts", opt_stringptr, LOFF(tls_try_verify_hosts) },
144 { "tls_verify_cert_hostnames", opt_stringptr, LOFF(tls_verify_cert_hostnames)},
145 { "tls_verify_certificates", opt_stringptr, LOFF(tls_verify_certificates) },
146 { "tls_verify_hosts", opt_stringptr, LOFF(tls_verify_hosts) },
149 { "utf8_downconvert", opt_stringptr, LOFF(utf8_downconvert) },
153 /* Size of the options list. An extern variable has to be used so that its
154 address can appear in the tables drtables.c. */
156 int smtp_transport_options_count = nelem(smtp_transport_options);
162 smtp_transport_options_block smtp_transport_option_defaults = {0};
163 void smtp_transport_init(driver_instance *tblock) {}
164 BOOL smtp_transport_entry(transport_instance *tblock, address_item *addr) {return FALSE;}
165 void smtp_transport_closedown(transport_instance *tblock) {}
167 #else /*!MACRO_PREDEF*/
170 /* Default private options block for the smtp transport. */
172 smtp_transport_options_block smtp_transport_option_defaults = {
173 /* All non-mentioned elements 0/NULL/FALSE */
174 .helo_data = US"$primary_hostname",
175 .protocol = US"smtp",
176 .hosts_try_chunking = US"*",
178 .hosts_try_dane = US"*",
180 .hosts_try_fastopen = US"*",
182 .hosts_try_prdr = US"*",
185 .hosts_request_ocsp = US"*", /* hosts_request_ocsp (except under DANE; tls_client_start()) */
187 .command_timeout = 5*60,
188 .connect_timeout = 5*60,
189 .data_timeout = 5*60,
190 .final_timeout = 10*60,
191 .size_addition = 1024,
193 .hosts_max_try_hardlimit = 50,
194 .message_linelength_limit = 998,
195 .address_retry_include_sender = TRUE,
196 .dns_qualify_single = TRUE,
197 .dnssec = { .request= US"*", .require=NULL },
198 .delay_after_cutoff = TRUE,
200 .retry_include_ip_address = TRUE,
202 .tls_verify_certificates = US"system",
203 .tls_dh_min_bits = EXIM_CLIENT_DH_DEFAULT_MIN_BITS,
204 .tls_tempfail_tryclear = TRUE,
205 .tls_try_verify_hosts = US"*",
206 .tls_verify_cert_hostnames = US"*",
209 .utf8_downconvert = US"-1",
213 { .dkim_hash = US"sha256", },
217 /* some DSN flags for use later */
219 static int rf_list[] = {rf_notify_never, rf_notify_success,
220 rf_notify_failure, rf_notify_delay };
222 static uschar *rf_names[] = { US"NEVER", US"SUCCESS", US"FAILURE", US"DELAY" };
228 static uschar *smtp_command; /* Points to last cmd for error messages */
229 static uschar *mail_command; /* Points to MAIL cmd for error messages */
230 static uschar *data_command = US""; /* Points to DATA cmd for error messages */
231 static BOOL update_waiting; /* TRUE to update the "wait" database */
233 /*XXX move to smtp_context */
234 static BOOL pipelining_active; /* current transaction is in pipe mode */
237 static unsigned ehlo_response(uschar * buf, unsigned checks);
239 /* sync_responses() return codes */
241 #define RESP_BIT_HAD_5XX BIT(1)
242 #define RESP_BIT_HAD_2XX BIT(0)
243 #define RESP_HAD_2_AND_5 (RESP_BIT_HAD_2XX | RESP_BIT_HAD_5XX)
244 #define RESP_NOERROR 0
245 #define RESP_RCPT_TIMEO -1
246 #define RESP_RCPT_ERROR -2
247 #define RESP_MAIL_OR_DATA_ERROR -3
248 #define RESP_EPIPE_EHLO_ERR -4
249 #define RESP_EHLO_ERR_TLS -5
251 /******************************************************************************/
254 smtp_deliver_init(void)
258 const pcre2_code ** re;
259 const uschar * string;
262 { ®ex_AUTH, AUTHS_REGEX },
263 { ®ex_CHUNKING, US"\\n250[\\s\\-]CHUNKING(\\s|\\n|$)" },
264 { ®ex_DSN, US"\\n250[\\s\\-]DSN(\\s|\\n|$)" },
265 { ®ex_IGNOREQUOTA, US"\\n250[\\s\\-]IGNOREQUOTA(\\s|\\n|$)" },
266 { ®ex_PIPELINING, US"\\n250[\\s\\-]PIPELINING(\\s|\\n|$)" },
267 { ®ex_SIZE, US"\\n250[\\s\\-]SIZE(\\s|\\n|$)" },
270 { ®ex_STARTTLS, US"\\n250[\\s\\-]STARTTLS(\\s|\\n|$)" },
273 { ®ex_PRDR, US"\\n250[\\s\\-]PRDR(\\s|\\n|$)" },
276 { ®ex_UTF8, US"\\n250[\\s\\-]SMTPUTF8(\\s|\\n|$)" },
278 #ifndef DISABLE_PIPE_CONNECT
279 { ®ex_EARLY_PIPE, US"\\n250[\\s\\-]" EARLY_PIPE_FEATURE_NAME "(\\s|\\n|$)" },
281 #ifndef DISABLE_ESMTP_LIMITS
282 { ®ex_LIMITS, US"\\n250[\\s\\-]LIMITS\\s" },
286 for (struct list * l = list; l < list + nelem(list); l++)
288 *l->re = regex_must_compile(l->string, MCS_NOFLAGS, TRUE);
292 /*************************************************
293 * Setup entry point *
294 *************************************************/
296 /* This function is called when the transport is about to be used,
297 but before running it in a sub-process. It is used for two things:
299 (1) To set the fallback host list in addresses, when delivering.
300 (2) To pass back the interface, port, protocol, and other options, for use
301 during callout verification.
304 tblock pointer to the transport instance block
305 addrlist list of addresses about to be transported
306 tf if not NULL, pointer to block in which to return options
307 uid the uid that will be set (not used)
308 gid the gid that will be set (not used)
309 errmsg place for error message (not used)
311 Returns: OK always (FAIL, DEFER not used)
315 smtp_transport_setup(transport_instance *tblock, address_item *addrlist,
316 transport_feedback *tf, uid_t uid, gid_t gid, uschar **errmsg)
318 smtp_transport_options_block * ob = tblock->drinst.options_block;
320 /* Pass back options if required. This interface is getting very messy. */
324 tf->interface = ob->interface;
326 tf->protocol = ob->protocol;
327 tf->hosts = ob->hosts;
328 tf->hosts_override = ob->hosts_override;
329 tf->hosts_randomize = ob->hosts_randomize;
330 tf->gethostbyname = ob->gethostbyname;
331 tf->qualify_single = ob->dns_qualify_single;
332 tf->search_parents = ob->dns_search_parents;
333 tf->helo_data = ob->helo_data;
336 /* Set the fallback host list for all the addresses that don't have fallback
337 host lists, provided that the local host wasn't present in the original host
340 if (!testflag(addrlist, af_local_host_removed))
341 for (; addrlist; addrlist = addrlist->next)
342 if (!addrlist->fallback_hosts) addrlist->fallback_hosts = ob->fallback_hostlist;
349 /*************************************************
350 * Initialization entry point *
351 *************************************************/
353 /* Called for each instance, after its options have been read, to
354 enable consistency checks to be done, or anything else that needs
357 Argument: pointer to the transport instance block
362 smtp_transport_init(driver_instance * t)
364 transport_instance * tblock = (transport_instance *)t;
365 smtp_transport_options_block * ob = t->options_block;
366 int old_pool = store_pool;
368 /* Retry_use_local_part defaults FALSE if unset */
370 if (tblock->retry_use_local_part == TRUE_UNSET)
371 tblock->retry_use_local_part = FALSE;
373 /* Set the default port according to the protocol */
376 ob->port = strcmpic(ob->protocol, US"lmtp") == 0
378 : strcmpic(ob->protocol, US"smtps") == 0
379 ? US"smtps" : US"smtp";
381 /* Set up the setup entry point, to be called before subprocesses for this
384 tblock->setup = smtp_transport_setup;
386 /* Complain if any of the timeouts are zero. */
388 if (ob->command_timeout <= 0 || ob->data_timeout <= 0 ||
389 ob->final_timeout <= 0)
390 log_write(0, LOG_PANIC_DIE|LOG_CONFIG,
391 "command, data, or final timeout value is zero for %s transport",
394 /* If hosts_override is set and there are local hosts, set the global
395 flag that stops verify from showing router hosts. */
397 if (ob->hosts_override && ob->hosts) tblock->overrides_hosts = TRUE;
399 /* If there are any fallback hosts listed, build a chain of host items
400 for them, but do not do any lookups at this time. */
402 store_pool = POOL_PERM;
403 host_build_hostlist(&ob->fallback_hostlist, ob->fallback_hosts, FALSE);
404 store_pool = old_pool;
411 /*************************************************
412 * Set delivery info into all active addresses *
413 *************************************************/
415 /* Only addresses whose status is >= PENDING are relevant. A lesser
416 status means that an address is not currently being processed.
419 addrlist points to a chain of addresses
420 errno_value to put in each address's errno field
421 msg to put in each address's message field
422 rc to put in each address's transport_return field
423 pass_message if TRUE, set the "pass message" flag in the address
424 host if set, mark addrs as having used this host
425 smtp_greeting from peer
426 helo_response from peer
427 start points to timestamp of delivery start
429 If errno_value has the special value ERRNO_CONNECTTIMEOUT, ETIMEDOUT is put in
430 the errno field, and RTEF_CTOUT is ORed into the more_errno field, to indicate
431 this particular type of timeout.
437 set_errno(address_item *addrlist, int errno_value, uschar *msg, int rc,
438 BOOL pass_message, host_item * host,
439 #ifdef EXPERIMENTAL_DSN_INFO
440 const uschar * smtp_greeting, const uschar * helo_response,
442 struct timeval * start
446 struct timeval deliver_time;
448 if (errno_value == ERRNO_CONNECTTIMEOUT)
450 errno_value = ETIMEDOUT;
451 orvalue = RTEF_CTOUT;
453 timesince(&deliver_time, start);
455 for (address_item * addr = addrlist; addr; addr = addr->next)
456 if (addr->transport_return >= PENDING)
458 addr->basic_errno = errno_value;
459 addr->more_errno |= orvalue;
460 addr->delivery_time = deliver_time;
464 if (pass_message) setflag(addr, af_pass_message);
466 addr->transport_return = rc;
469 addr->host_used = host;
470 if (continue_sequence > 1)
471 { clearflag(addr, af_new_conn); setflag(addr, af_cont_conn); }
473 { clearflag(addr, af_cont_conn); setflag(addr, af_new_conn); }
474 #ifdef EXPERIMENTAL_DSN_INFO
476 {uschar * s = Ustrchr(smtp_greeting, '\n'); if (s) *s = '\0';}
477 addr->smtp_greeting = smtp_greeting;
480 {uschar * s = Ustrchr(helo_response, '\n'); if (s) *s = '\0';}
481 addr->helo_response = helo_response;
488 set_errno_nohost(address_item * addrlist, int errno_value, uschar * msg, int rc,
489 BOOL pass_message, struct timeval * start)
491 set_errno(addrlist, errno_value, msg, rc, pass_message, NULL,
492 #ifdef EXPERIMENTAL_DSN_INFO
499 /*************************************************
500 * Check an SMTP response *
501 *************************************************/
503 /* This function is given an errno code and the SMTP response buffer
504 to analyse, together with the host identification for generating messages. It
505 sets an appropriate message and puts the first digit of the response code into
506 the yield variable. If no response was actually read, a suitable digit is
510 host the current host, to get its name for messages
511 errno_value pointer to the errno value
512 more_errno from the top address for use with ERRNO_FILTER_FAIL
513 buffer the SMTP response buffer
514 yield where to put a one-digit SMTP response code
515 message where to put an error message
516 pass_message set TRUE if message is an SMTP response
518 Returns: TRUE if an SMTP "QUIT" command should be sent, else FALSE
522 check_response(host_item *host, int *errno_value, int more_errno,
523 uschar *buffer, int *yield, uschar **message, BOOL *pass_message)
525 uschar * pl = pipelining_active ? US"pipelined " : US"";
528 *yield = '4'; /* Default setting is to give a temporary error */
532 case ETIMEDOUT: /* Handle response timeout */
533 *message = US string_sprintf("SMTP timeout after %s%s",
535 if (transport_count > 0)
536 *message = US string_sprintf("%s (%d bytes written)", *message,
540 case ERRNO_SMTPFORMAT: /* Handle malformed SMTP response */
541 s = string_printing(buffer);
542 Uskip_whitespace(&s);
544 ? string_sprintf("Malformed SMTP reply (an empty line) "
545 "in response to %s%s", pl, smtp_command)
546 : string_sprintf("Malformed SMTP reply in response to %s%s: %s",
547 pl, smtp_command, s);
550 case ERRNO_TLSFAILURE: /* Handle bad first read; can happen with
552 *message = US"bad first read from TLS conn";
555 case ERRNO_FILTER_FAIL: /* Handle a failed filter process error;
556 can't send QUIT as we mustn't end the DATA. */
557 *message = string_sprintf("transport filter process failed (%d)%s",
559 more_errno == EX_EXECFAILED ? ": unable to execute command" : "");
562 case ERRNO_CHHEADER_FAIL: /* Handle a failed add_headers expansion;
563 can't send QUIT as we mustn't end the DATA. */
565 string_sprintf("failed to expand headers_add or headers_remove: %s",
566 expand_string_message);
569 case ERRNO_WRITEINCOMPLETE: /* failure to write a complete data block */
570 *message = US"failed to write a data block";
574 case ERRNO_UTF8_FWD: /* no advertised SMTPUTF8, for international message */
575 *message = US"utf8 support required but not offered for forwarding";
576 DEBUG(D_deliver|D_transport) debug_printf("%s\n", *message);
581 /* Handle error responses from the remote mailer. */
585 *message = string_sprintf("SMTP error from remote mail server after %s%s: "
586 "%s", pl, smtp_command, s = string_printing(buffer));
587 *pass_message = TRUE;
592 /* No data was read. If there is no errno, this must be the EOF (i.e.
593 connection closed) case, which causes deferral. An explicit connection reset
594 error has the same effect. Otherwise, put the host's identity in the message,
595 leaving the errno value to be interpreted as well. In all cases, we have to
596 assume the connection is now dead. */
598 if (*errno_value == 0 || *errno_value == ECONNRESET)
600 *errno_value = ERRNO_SMTPCLOSED;
601 *message = US string_sprintf("Remote host closed connection "
602 "in response to %s%s", pl, smtp_command);
605 *message = US string_sprintf("%s [%s]", host->name, host->address);
612 /*************************************************
613 * Write error message to logs *
614 *************************************************/
616 /* This writes to the main log and to the message log.
619 host the current host
620 detail the current message (addr_item->message)
621 basic_errno the errno (addr_item->basic_errno)
627 write_logs(const host_item *host, const uschar *suffix, int basic_errno)
629 gstring * message = LOGGING(outgoing_port)
630 ? string_fmt_append(NULL, "H=%s [%s]:%d", host->name, host->address,
631 host->port == PORT_NONE ? 25 : host->port)
632 : string_fmt_append(NULL, "H=%s [%s]", host->name, host->address);
636 message = string_fmt_append(message, ": %s", suffix);
638 message = string_fmt_append(message, ": %s", strerror(basic_errno));
641 message = string_fmt_append(message, " %s", exim_errstr(basic_errno));
643 log_write(0, LOG_MAIN, "%Y", message);
644 deliver_msglog("%s %.*s\n", tod_stamp(tod_log), message->ptr, message->s);
648 msglog_line(host_item * host, uschar * message)
650 deliver_msglog("%s H=%s [%s] %s\n", tod_stamp(tod_log),
651 host->name, host->address, message);
656 #ifndef DISABLE_EVENT
657 /*************************************************
658 * Post-defer action *
659 *************************************************/
661 /* This expands an arbitrary per-transport string.
662 It might, for example, be used to write to the database log.
665 addr the address item containing error information
666 host the current host
673 deferred_event_raise(address_item * addr, host_item * host, uschar * evstr)
675 uschar * action = addr->transport->event_action;
676 const uschar * save_domain, * save_local;
677 const uschar * save_rn, * save_tn;
682 save_domain = deliver_domain;
683 save_local = deliver_localpart;
684 save_rn = router_name;
685 save_tn = transport_name;
687 /*XXX would ip & port already be set up? */
688 deliver_host_address = string_copy(host->address);
689 deliver_host_port = host->port == PORT_NONE ? 25 : host->port;
690 event_defer_errno = addr->basic_errno;
692 router_name = addr->router->drinst.name;
693 transport_name = addr->transport->drinst.name;
694 deliver_domain = addr->domain;
695 deliver_localpart = addr->local_part;
697 (void) event_raise(action, evstr,
699 ? addr->basic_errno > 0
700 ? string_sprintf("%s: %s", addr->message, strerror(addr->basic_errno))
701 : string_copy(addr->message)
702 : addr->basic_errno > 0
703 ? string_copy(US strerror(addr->basic_errno))
707 deliver_localpart = save_local;
708 deliver_domain = save_domain;
709 router_name = save_rn;
710 router_name = save_tn;
714 /*************************************************
715 * Reap SMTP specific responses *
716 *************************************************/
718 smtp_discard_responses(smtp_context * sx, smtp_transport_options_block * ob,
721 uschar flushbuffer[4096];
725 if (!smtp_read_response(sx, flushbuffer, sizeof(flushbuffer),
726 '2', ob->command_timeout)
727 && (errno != 0 || flushbuffer[0] == 0))
734 /* Return boolean success */
737 smtp_reap_banner(smtp_context * sx)
740 #if defined(__linux__) && defined(TCP_QUICKACK)
741 { /* Hack to get QUICKACK disabled; has to be right after 3whs, and has to on->off */
742 int sock = sx->cctx.sock;
743 struct pollfd p = {.fd = sock, .events = POLLOUT};
744 if (poll(&p, 1, 1000) >= 0) /* retval test solely for compiler quitening */
746 (void) setsockopt(sock, IPPROTO_TCP, TCP_QUICKACK, US &on, sizeof(on));
747 (void) setsockopt(sock, IPPROTO_TCP, TCP_QUICKACK, US &off, sizeof(off));
751 good_response = smtp_read_response(sx, sx->buffer, sizeof(sx->buffer),
752 '2', (SOB sx->conn_args.ob)->command_timeout);
753 #ifdef EXPERIMENTAL_DSN_INFO
754 sx->smtp_greeting = string_copy(sx->buffer);
756 return good_response;
760 smtp_reap_ehlo(smtp_context * sx)
762 if (!smtp_read_response(sx, sx->buffer, sizeof(sx->buffer), '2',
763 (SOB sx->conn_args.ob)->command_timeout))
765 if (errno != 0 || sx->buffer[0] == 0 || sx->lmtp)
767 #ifdef EXPERIMENTAL_DSN_INFO
768 sx->helo_response = string_copy(sx->buffer);
774 #ifdef EXPERIMENTAL_DSN_INFO
775 sx->helo_response = string_copy(sx->buffer);
777 #ifndef DISABLE_EVENT
778 (void) event_raise(sx->conn_args.tblock->event_action,
779 US"smtp:ehlo", sx->buffer, NULL);
785 #if !defined(DISABLE_TLS) && !defined(DISABLE_TLS_RESUME)
787 /* Grab a string differentiating server behind a loadbalancer, for TLS
788 resumption when such servers do not share a session-cache */
791 ehlo_response_lbserver(smtp_context * sx, const uschar * name_extract)
794 uschar * save_item = iterate_item;
796 if (sx->conn_args.have_lbserver)
798 iterate_item = sx->buffer;
799 s = expand_cstring(name_extract);
800 iterate_item = save_item;
801 sx->conn_args.host_lbserver = s && !*s ? NULL : s;
802 sx->conn_args.have_lbserver = TRUE;
808 /******************************************************************************/
810 #ifndef DISABLE_ESMTP_LIMITS
811 /* If TLS, or TLS not offered, called with the EHLO response in the buffer.
812 Check it for a LIMITS keyword and parse values into the smtp context structure.
814 We don't bother with peers that we won't talk TLS to, even though they can,
815 just ignore their LIMITS advice (if any) and treat them as if they do not.
816 This saves us dealing with a duplicate set of values. */
819 ehlo_response_limits_read(smtp_context * sx)
823 /* matches up to just after the first space after the keyword */
825 if (regex_match(regex_LIMITS, sx->buffer, -1, &match))
826 for (const uschar * s = sx->buffer + Ustrlen(match); *s; )
828 if (Uskip_whitespace(&s) == '\n') break;
830 if (strncmpic(s, US"MAILMAX=", 8) == 0)
832 continue_limit_mail = sx->peer_limit_mail = atoi(CS (s += 8));
833 while (isdigit(*s)) s++;
835 else if (strncmpic(s, US"RCPTMAX=", 8) == 0)
837 continue_limit_rcpt = sx->peer_limit_rcpt = atoi(CS (s += 8));
838 while (isdigit(*s)) s++;
840 else if (strncmpic(s, US"RCPTDOMAINMAX=", 14) == 0)
842 continue_limit_rcptdom = sx->peer_limit_rcptdom = atoi(CS (s += 14));
843 while (isdigit(*s)) s++;
846 while (*s && !isspace(*s)) s++;
850 /* Apply given values to the current connection */
852 ehlo_limits_apply(smtp_context * sx,
853 unsigned limit_mail, unsigned limit_rcpt, unsigned limit_rcptdom)
855 if (limit_mail && limit_mail < sx->max_mail) sx->max_mail = limit_mail;
856 if (limit_rcpt && limit_rcpt < sx->max_rcpt) sx->max_rcpt = limit_rcpt;
859 DEBUG(D_transport) debug_printf("will treat as !multi_domain\n");
860 sx->single_rcpt_domain = TRUE;
864 /* Apply values from EHLO-resp to the current connection */
866 ehlo_response_limits_apply(smtp_context * sx)
868 ehlo_limits_apply(sx, sx->peer_limit_mail, sx->peer_limit_rcpt,
869 sx->peer_limit_rcptdom);
872 # ifndef DISABLE_PIPE_CONNECT
873 /* Apply values read from cache to the current connection */
875 ehlo_cache_limits_apply(smtp_context * sx)
877 ehlo_limits_apply(sx, sx->ehlo_resp.limit_mail, sx->ehlo_resp.limit_rcpt,
878 sx->ehlo_resp.limit_rcptdom);
881 #endif /*DISABLE_ESMTP_LIMITS*/
883 /******************************************************************************/
885 #ifndef DISABLE_PIPE_CONNECT
887 ehlo_cache_key(const smtp_context * sx)
889 host_item * host = sx->conn_args.host;
890 return Ustrchr(host->address, ':')
891 ? string_sprintf("[%s]:%d.EHLO", host->address,
892 host->port == PORT_NONE ? sx->port : host->port)
893 : string_sprintf("%s:%d.EHLO", host->address,
894 host->port == PORT_NONE ? sx->port : host->port);
897 /* Cache EHLO-response info for use by early-pipe.
899 - During a normal flow on EHLO response (either cleartext or under TLS),
900 when we are willing to do PIPECONNECT and it is offered
901 - During an early-pipe flow on receiving the actual EHLO response and noting
902 disparity versus the cached info used, when PIPECONNECT is still being offered
904 We assume that suitable values have been set in the sx.ehlo_resp structure for
905 features and auths; we handle the copy of limits. */
908 write_ehlo_cache_entry(smtp_context * sx)
910 open_db dbblock, * dbm_file;
912 # ifndef DISABLE_ESMTP_LIMITS
913 sx->ehlo_resp.limit_mail = sx->peer_limit_mail;
914 sx->ehlo_resp.limit_rcpt = sx->peer_limit_rcpt;
915 sx->ehlo_resp.limit_rcptdom = sx->peer_limit_rcptdom;
918 if ((dbm_file = dbfn_open(US"misc", O_RDWR|O_CREAT, &dbblock, TRUE, TRUE)))
920 uschar * ehlo_resp_key = ehlo_cache_key(sx);
921 dbdata_ehlo_resp er = { .data = sx->ehlo_resp };
924 # ifndef DISABLE_ESMTP_LIMITS
925 if (sx->ehlo_resp.limit_mail || sx->ehlo_resp.limit_rcpt || sx->ehlo_resp.limit_rcptdom)
926 debug_printf("writing clr %04x/%04x cry %04x/%04x lim %05d/%05d/%05d\n",
927 sx->ehlo_resp.cleartext_features, sx->ehlo_resp.cleartext_auths,
928 sx->ehlo_resp.crypted_features, sx->ehlo_resp.crypted_auths,
929 sx->ehlo_resp.limit_mail, sx->ehlo_resp.limit_rcpt,
930 sx->ehlo_resp.limit_rcptdom);
933 debug_printf("writing clr %04x/%04x cry %04x/%04x\n",
934 sx->ehlo_resp.cleartext_features, sx->ehlo_resp.cleartext_auths,
935 sx->ehlo_resp.crypted_features, sx->ehlo_resp.crypted_auths);
937 dbfn_write(dbm_file, ehlo_resp_key, &er, (int)sizeof(er));
938 dbfn_close(dbm_file);
943 invalidate_ehlo_cache_entry(smtp_context * sx)
945 open_db dbblock, * dbm_file;
947 if ( sx->early_pipe_active
948 && (dbm_file = dbfn_open(US"misc", O_RDWR|O_CREAT, &dbblock, TRUE, TRUE)))
950 uschar * ehlo_resp_key = ehlo_cache_key(sx);
953 dbdata_ehlo_resp * er;
955 if (!(er = dbfn_read_enforce_length(dbm_file, ehlo_resp_key, sizeof(dbdata_ehlo_resp))))
956 debug_printf("no ehlo-resp record!\n");
958 debug_printf("ehlo-resp record is %.0f seconds old\n",
959 difftime(time(NULL), er->time_stamp));
962 dbfn_delete(dbm_file, ehlo_resp_key);
963 dbfn_close(dbm_file);
968 read_ehlo_cache_entry(smtp_context * sx)
973 if (!(dbm_file = dbfn_open(US"misc", O_RDONLY, &dbblock, FALSE, TRUE)))
974 { DEBUG(D_transport) debug_printf("ehlo-cache: no misc DB\n"); }
977 uschar * ehlo_resp_key = ehlo_cache_key(sx);
978 dbdata_ehlo_resp * er;
980 if (!(er = dbfn_read_enforce_length(dbm_file, ehlo_resp_key, sizeof(dbdata_ehlo_resp))))
981 { DEBUG(D_transport) debug_printf("no ehlo-resp record\n"); }
982 else if (time(NULL) - er->time_stamp > retry_data_expire)
984 DEBUG(D_transport) debug_printf("ehlo-resp record too old\n");
985 dbfn_close(dbm_file);
986 if ((dbm_file = dbfn_open(US"misc", O_RDWR|O_CREAT, &dbblock, TRUE, TRUE)))
987 dbfn_delete(dbm_file, ehlo_resp_key);
992 # ifndef DISABLE_ESMTP_LIMITS
993 if (er->data.limit_mail || er->data.limit_rcpt || er->data.limit_rcptdom)
994 debug_printf("EHLO response bits from cache:"
995 " cleartext 0x%04x/0x%04x crypted 0x%04x/0x%04x lim %05d/%05d/%05d\n",
996 er->data.cleartext_features, er->data.cleartext_auths,
997 er->data.crypted_features, er->data.crypted_auths,
998 er->data.limit_mail, er->data.limit_rcpt, er->data.limit_rcptdom);
1001 debug_printf("EHLO response bits from cache:"
1002 " cleartext 0x%04x/0x%04x crypted 0x%04x/0x%04x\n",
1003 er->data.cleartext_features, er->data.cleartext_auths,
1004 er->data.crypted_features, er->data.crypted_auths);
1006 sx->ehlo_resp = er->data;
1007 # ifndef DISABLE_ESMTP_LIMITS
1008 ehlo_cache_limits_apply(sx);
1010 dbfn_close(dbm_file);
1013 dbfn_close(dbm_file);
1020 /* Return an auths bitmap for the set of AUTH methods offered by the server
1021 which match our client-side authenticators. */
1023 static unsigned short
1024 study_ehlo_auths(smtp_context * sx)
1029 unsigned short authbits = 0;
1031 if (!sx->esmtp) return 0;
1032 if (!regex_AUTH) regex_AUTH = regex_must_compile(AUTHS_REGEX, MCS_NOFLAGS, TRUE);
1033 if (!regex_match_and_setup(regex_AUTH, sx->buffer, 0, -1)) return 0;
1034 expand_nmax = -1; /* reset */
1035 names = string_copyn(expand_nstring[1], expand_nlength[1]);
1037 for (au = auths, authnum = 0; au; au = au->drinst.next, authnum++)
1040 const uschar * list = names;
1042 for (int sep = ' '; s = string_nextinlist(&list, &sep, NULL, 0); )
1043 if (strcmpic(au->public_name, s) == 0)
1044 { authbits |= BIT(authnum); break; }
1048 debug_printf("server offers %s AUTH, methods '%s', usable-bitmap 0x%04x\n",
1049 tls_out.active.sock >= 0 ? "crypted" : "plaintext", names, authbits);
1051 if (tls_out.active.sock >= 0)
1052 sx->ehlo_resp.crypted_auths = authbits;
1054 sx->ehlo_resp.cleartext_auths = authbits;
1061 /* Wait for and check responses for early-pipelining.
1063 Called from the lower-level smtp_read_response() function
1064 used for general code that assume synchronisation, if context
1065 flags indicate outstanding early-pipelining commands. Also
1066 called fom sync_responses() which handles pipelined commands.
1069 sx smtp connection context
1070 countp number of outstanding responses, adjusted on return
1074 DEFER error on first read of TLS'd conn
1075 FAIL SMTP error in response
1078 smtp_reap_early_pipe(smtp_context * sx, int * countp)
1080 BOOL pending_BANNER = sx->pending_BANNER;
1081 BOOL pending_EHLO = sx->pending_EHLO;
1084 sx->pending_BANNER = FALSE; /* clear early to avoid recursion */
1085 sx->pending_EHLO = FALSE;
1091 DEBUG(D_transport) debug_printf("%s expect banner\n", __FUNCTION__);
1093 if (!smtp_reap_banner(sx))
1095 DEBUG(D_transport) debug_printf("bad banner\n");
1096 if (tls_out.active.sock >= 0) rc = DEFER;
1099 /*XXX DISABLE_ESMTP_LIMITS ? */
1101 # if !defined(DISABLE_TLS) && !defined(DISABLE_TLS_RESUME)
1102 GET_OPTION("host_name_extract");
1103 s = ((smtp_transport_options_block *)sx->conn_args.ob)->host_name_extract;
1104 if (!s) s = HNE_DEFAULT;
1105 ehlo_response_lbserver(sx, s);
1111 unsigned peer_offered;
1112 unsigned short authbits = 0, * ap;
1114 DEBUG(D_transport) debug_printf("%s expect ehlo\n", __FUNCTION__);
1116 if (!smtp_reap_ehlo(sx))
1118 DEBUG(D_transport) debug_printf("bad response for EHLO\n");
1119 if (tls_out.active.sock >= 0) rc = DEFER;
1123 /* Compare the actual EHLO response extensions and AUTH methods to the cached
1124 value we assumed; on difference, dump or rewrite the cache and arrange for a
1127 ap = tls_out.active.sock < 0
1128 ? &sx->ehlo_resp.cleartext_auths : &sx->ehlo_resp.crypted_auths;
1130 peer_offered = ehlo_response(sx->buffer,
1131 (tls_out.active.sock < 0 ? OPTION_TLS : 0)
1132 | OPTION_CHUNKING | OPTION_PRDR | OPTION_DSN | OPTION_PIPE | OPTION_SIZE
1133 | OPTION_UTF8 | OPTION_EARLY_PIPE
1135 # ifndef DISABLE_ESMTP_LIMITS
1136 if (tls_out.active.sock >= 0 || !(peer_offered & OPTION_TLS))
1137 ehlo_response_limits_read(sx);
1139 if ( peer_offered != sx->peer_offered
1140 || (authbits = study_ehlo_auths(sx)) != *ap)
1143 debug_printf("EHLO %s extensions changed, 0x%04x/0x%04x -> 0x%04x/0x%04x\n",
1144 tls_out.active.sock < 0 ? "cleartext" : "crypted",
1145 sx->peer_offered, *ap, peer_offered, authbits);
1146 if (peer_offered & OPTION_EARLY_PIPE)
1148 *(tls_out.active.sock < 0
1149 ? &sx->ehlo_resp.cleartext_features : &sx->ehlo_resp.crypted_features) =
1152 write_ehlo_cache_entry(sx);
1156 invalidate_ehlo_cache_entry(sx);
1157 sx->early_pipe_active = FALSE; /* cancel further early-pipe on this conn */
1160 return OK; /* just carry on */
1162 # ifndef DISABLE_ESMTP_LIMITS
1163 /* If we are handling LIMITS, compare the actual EHLO LIMITS values with the
1164 cached values and invalidate cache if different. OK to carry on with
1165 connect since values are advisory. */
1167 if ( (tls_out.active.sock >= 0 || !(peer_offered & OPTION_TLS))
1168 && ( sx->peer_limit_mail != sx->ehlo_resp.limit_mail
1169 || sx->peer_limit_rcpt != sx->ehlo_resp.limit_rcpt
1170 || sx->peer_limit_rcptdom != sx->ehlo_resp.limit_rcptdom
1175 debug_printf("EHLO LIMITS changed:");
1176 if (sx->peer_limit_mail != sx->ehlo_resp.limit_mail)
1177 debug_printf(" MAILMAX %u -> %u\n", sx->ehlo_resp.limit_mail, sx->peer_limit_mail);
1178 else if (sx->peer_limit_rcpt != sx->ehlo_resp.limit_rcpt)
1179 debug_printf(" RCPTMAX %u -> %u\n", sx->ehlo_resp.limit_rcpt, sx->peer_limit_rcpt);
1181 debug_printf(" RCPTDOMAINMAX %u -> %u\n", sx->ehlo_resp.limit_rcptdom, sx->peer_limit_rcptdom);
1183 invalidate_ehlo_cache_entry(sx);
1191 invalidate_ehlo_cache_entry(sx);
1192 (void) smtp_discard_responses(sx, sx->conn_args.ob, *countp);
1195 #endif /*!DISABLE_PIPE_CONNECT*/
1198 /*************************************************
1199 * Synchronize SMTP responses *
1200 *************************************************/
1202 /* This function is called from smtp_deliver() to receive SMTP responses from
1203 the server, and match them up with the commands to which they relate. When
1204 PIPELINING is not in use, this function is called after every command, and is
1205 therefore somewhat over-engineered, but it is simpler to use a single scheme
1206 that works both with and without PIPELINING instead of having two separate sets
1209 The set of commands that are buffered up with pipelining may start with MAIL
1210 and may end with DATA; in between are RCPT commands that correspond to the
1211 addresses whose status is PENDING_DEFER. All other commands (STARTTLS, AUTH,
1212 etc.) are never buffered.
1214 Errors after MAIL or DATA abort the whole process leaving the response in the
1215 buffer. After MAIL, pending responses are flushed, and the original command is
1216 re-instated in big_buffer for error messages. For RCPT commands, the remote is
1217 permitted to reject some recipient addresses while accepting others. However
1218 certain errors clearly abort the whole process. Set the value in
1219 transport_return to PENDING_OK if the address is accepted. If there is a
1220 subsequent general error, it will get reset accordingly. If not, it will get
1221 converted to OK at the end.
1224 sx smtp connection context
1225 count the number of responses to read
1226 pending_DATA 0 if last command sent was not DATA
1227 +1 if previously had a good recipient
1228 -1 if not previously had a good recipient
1230 Returns: 3 if at least one address had 2xx and one had 5xx
1231 2 if at least one address had 5xx but none had 2xx
1232 1 if at least one host had a 2xx response, but none had 5xx
1233 0 no address had 2xx or 5xx but no errors (all 4xx, or just DATA)
1234 -1 timeout while reading RCPT response
1235 -2 I/O or other non-response error for RCPT
1236 -3 DATA or MAIL failed - errno and buffer set
1237 -4 banner or EHLO failed (early-pipelining)
1238 -5 banner or EHLO failed (early-pipelining, TLS)
1242 sync_responses(smtp_context * sx, int count, int pending_DATA)
1244 address_item * addr = sx->sync_addr;
1245 smtp_transport_options_block * ob = sx->conn_args.ob;
1248 #ifndef DISABLE_PIPE_CONNECT
1250 if ((rc = smtp_reap_early_pipe(sx, &count)) != OK)
1251 return rc == FAIL ? RESP_EPIPE_EHLO_ERR : RESP_EHLO_ERR_TLS;
1254 /* Handle the response for a MAIL command. On error, reinstate the original
1255 command in big_buffer for error message use, and flush any further pending
1256 responses before returning, except after I/O errors and timeouts. */
1258 if (sx->pending_MAIL)
1260 DEBUG(D_transport) debug_printf("%s expect mail\n", __FUNCTION__);
1262 sx->pending_MAIL = sx->RCPT_452 = FALSE;
1263 if (!smtp_read_response(sx, sx->buffer, sizeof(sx->buffer),
1264 '2', ob->command_timeout))
1266 DEBUG(D_transport) debug_printf("bad response for MAIL\n");
1267 Ustrcpy(big_buffer, mail_command); /* Fits, because it came from there! */
1268 if (errno == ERRNO_TLSFAILURE)
1269 return RESP_EHLO_ERR_TLS;
1270 if (errno == 0 && sx->buffer[0] != 0)
1273 if (sx->buffer[0] == '4')
1275 save_errno = ERRNO_MAIL4XX;
1276 addr->more_errno |= ((sx->buffer[1] - '0')*10 + sx->buffer[2] - '0') << 8;
1278 count = smtp_discard_responses(sx, ob, count);
1282 if (pending_DATA) count--; /* Number of RCPT responses to come */
1283 while (count-- > 0) /* Mark any pending addrs with the host used */
1285 while (addr->transport_return != PENDING_DEFER) addr = addr->next;
1286 addr->host_used = sx->conn_args.host;
1287 if (continue_sequence > 1)
1288 { clearflag(addr, af_new_conn); setflag(addr, af_cont_conn); }
1290 { clearflag(addr, af_cont_conn); setflag(addr, af_new_conn); }
1293 return RESP_MAIL_OR_DATA_ERROR;
1297 if (pending_DATA) count--; /* Number of RCPT responses to come */
1299 /* Read and handle the required number of RCPT responses, matching each one up
1300 with an address by scanning for the next address whose status is PENDING_DEFER.
1305 while (addr->transport_return != PENDING_DEFER)
1306 if (!(addr = addr->next))
1307 return RESP_RCPT_ERROR;
1309 /* The address was accepted */
1310 addr->host_used = sx->conn_args.host;
1311 if (continue_sequence > 1)
1312 { clearflag(addr, af_new_conn); setflag(addr, af_cont_conn); }
1314 { clearflag(addr, af_cont_conn); setflag(addr, af_new_conn); }
1316 DEBUG(D_transport) debug_printf("%s expect rcpt for %s\n", __FUNCTION__, addr->address);
1317 if (smtp_read_response(sx, sx->buffer, sizeof(sx->buffer),
1318 '2', ob->command_timeout))
1320 yield |= RESP_BIT_HAD_2XX;
1321 addr->transport_return = PENDING_OK;
1323 /* If af_dr_retry_exists is set, there was a routing delay on this address;
1324 ensure that any address-specific retry record is expunged. We do this both
1325 for the basic key and for the version that also includes the sender. */
1327 if (testflag(addr, af_dr_retry_exists))
1329 uschar * altkey = string_sprintf("%s:<%s>", addr->address_retry_key,
1331 retry_add_item(addr, altkey, rf_delete);
1332 retry_add_item(addr, addr->address_retry_key, rf_delete);
1336 /* Error on first TLS read */
1338 else if (errno == ERRNO_TLSFAILURE)
1339 return RESP_EHLO_ERR_TLS;
1341 /* Timeout while reading the response */
1343 else if (errno == ETIMEDOUT)
1345 uschar * message = string_sprintf("SMTP timeout after RCPT TO:<%s>",
1346 transport_rcpt_address(addr, sx->conn_args.tblock->rcpt_include_affixes));
1347 set_errno_nohost(sx->first_addr, ETIMEDOUT, message, DEFER, FALSE, &sx->delivery_start);
1348 retry_add_item(addr, addr->address_retry_key, 0);
1349 update_waiting = FALSE;
1350 return RESP_RCPT_TIMEO;
1353 /* Handle other errors in obtaining an SMTP response by returning -1. This
1354 will cause all the addresses to be deferred. Restore the SMTP command in
1355 big_buffer for which we are checking the response, so the error message
1358 else if (errno != 0 || sx->buffer[0] == 0)
1360 gstring gs = { .size = big_buffer_size, .ptr = 0, .s = big_buffer }, * g = &gs;
1362 /* Use taint-unchecked routines for writing into big_buffer, trusting
1363 that we'll never expand it. */
1365 g = string_fmt_append_f(g, SVFMT_TAINT_NOCHK, "RCPT TO:<%s>",
1366 transport_rcpt_address(addr, sx->conn_args.tblock->rcpt_include_affixes));
1367 string_from_gstring(g);
1368 return RESP_RCPT_ERROR;
1371 /* Handle SMTP permanent and temporary response codes. */
1376 string_sprintf("SMTP error from remote mail server after RCPT TO:<%s>: "
1377 "%s", transport_rcpt_address(addr, sx->conn_args.tblock->rcpt_include_affixes),
1378 string_printing(sx->buffer));
1379 setflag(addr, af_pass_message);
1381 msglog_line(sx->conn_args.host, addr->message);
1383 /* The response was 5xx */
1385 if (sx->buffer[0] == '5')
1387 addr->transport_return = FAIL;
1388 yield |= RESP_BIT_HAD_5XX;
1391 /* The response was 4xx */
1395 addr->transport_return = DEFER;
1396 addr->basic_errno = ERRNO_RCPT4XX;
1397 addr->more_errno |= ((sx->buffer[1] - '0')*10 + sx->buffer[2] - '0') << 8;
1401 #ifndef DISABLE_EVENT
1402 event_defer_errno = addr->more_errno;
1403 msg_event_raise(US"msg:rcpt:host:defer", addr);
1405 /* If a 452 and we've had at least one 2xx or 5xx, set next_addr to the
1406 start point for another MAIL command. */
1408 if (addr->more_errno >> 8 == 52 && yield > 0)
1410 if (!sx->RCPT_452) /* initialised at MAIL-ack above */
1413 debug_printf("%s: seen first 452 too-many-rcpts\n", __FUNCTION__);
1414 sx->RCPT_452 = TRUE;
1415 sx->next_addr = addr;
1417 addr->transport_return = PENDING_DEFER;
1418 addr->basic_errno = 0;
1422 /* Log temporary errors if there are more hosts to be tried.
1423 If not, log this last one in the == line. */
1425 if (sx->conn_args.host->next)
1426 if (LOGGING(outgoing_port))
1427 log_write(0, LOG_MAIN, "H=%s [%s]:%d %s", sx->conn_args.host->name,
1428 sx->conn_args.host->address,
1429 sx->port == PORT_NONE ? 25 : sx->port, addr->message);
1431 log_write(0, LOG_MAIN, "H=%s [%s]: %s", sx->conn_args.host->name,
1432 sx->conn_args.host->address, addr->message);
1434 #ifndef DISABLE_EVENT
1436 msg_event_raise(US"msg:rcpt:defer", addr);
1439 /* Do not put this message on the list of those waiting for specific
1440 hosts, as otherwise it is likely to be tried too often. */
1442 update_waiting = FALSE;
1444 /* Add a retry item for the address so that it doesn't get tried again
1445 too soon. If address_retry_include_sender is true, add the sender address
1446 to the retry key. */
1448 retry_add_item(addr,
1449 ob->address_retry_include_sender
1450 ? string_sprintf("%s:<%s>", addr->address_retry_key, sender_address)
1451 : addr->address_retry_key,
1457 if (count && !(addr = addr->next))
1458 return RESP_RCPT_ERROR;
1459 } /* Loop for next RCPT response */
1461 /* Update where to start at for the next block of responses, unless we
1462 have already handled all the addresses. */
1464 if (addr) sx->sync_addr = addr->next;
1466 /* Handle a response to DATA. If we have not had any good recipients, either
1467 previously or in this block, the response is ignored. */
1469 if (pending_DATA != 0)
1471 DEBUG(D_transport) debug_printf("%s expect data\n", __FUNCTION__);
1472 if (!smtp_read_response(sx, sx->buffer, sizeof(sx->buffer),
1473 '3', ob->command_timeout))
1479 if (errno == ERRNO_TLSFAILURE) /* Error on first TLS read */
1480 return RESP_EHLO_ERR_TLS;
1482 if (pending_DATA > 0 || yield & RESP_BIT_HAD_2XX)
1484 if (errno == 0 && sx->buffer[0] == '4')
1486 errno = ERRNO_DATA4XX;
1487 sx->first_addr->more_errno |= ((sx->buffer[1] - '0')*10 + sx->buffer[2] - '0') << 8;
1489 return RESP_MAIL_OR_DATA_ERROR;
1491 (void)check_response(sx->conn_args.host, &errno, 0, sx->buffer, &code, &msg, &pass_message);
1492 DEBUG(D_transport) debug_printf("%s\nerror for DATA ignored: pipelining "
1493 "is in use and there were no good recipients\n", msg);
1497 /* All responses read and handled; MAIL (if present) received 2xx and DATA (if
1498 present) received 3xx. If any RCPTs were handled and yielded anything other
1499 than 4xx, yield will be set non-zero. */
1508 /* Try an authenticator's client entry */
1511 try_authenticator(smtp_context * sx, auth_instance * au)
1513 smtp_transport_options_block * ob = sx->conn_args.ob; /* transport options */
1514 host_item * host = sx->conn_args.host; /* host to deliver to */
1517 /* Set up globals for error messages */
1519 authenticator_name = au->drinst.name;
1520 driver_srcfile = au->drinst.srcfile;
1521 driver_srcline = au->drinst.srcline;
1524 auth_info * ai = au->drinst.info;
1525 sx->outblock.authenticating = TRUE;
1526 rc = (ai->clientcode)(au, sx, ob->command_timeout,
1527 sx->buffer, sizeof(sx->buffer));
1528 sx->outblock.authenticating = FALSE;
1530 driver_srcfile = authenticator_name = NULL; driver_srcline = 0;
1531 DEBUG(D_transport) debug_printf("%s authenticator yielded %s\n",
1532 au->drinst.name, rc_names[rc]);
1534 /* A temporary authentication failure must hold up delivery to
1535 this host. After a permanent authentication failure, we carry on
1536 to try other authentication methods. If all fail hard, try to
1537 deliver the message unauthenticated unless require_auth was set. */
1542 f.smtp_authenticated = TRUE; /* stops the outer loop */
1543 client_authenticator = au->drinst.name;
1544 if (au->set_client_id)
1545 client_authenticated_id = expand_string(au->set_client_id);
1548 /* Failure after writing a command */
1553 /* Failure after reading a response */
1557 uschar * logmsg = NULL;
1559 if (errno != 0 || sx->buffer[0] != '5') return FAIL;
1560 #ifndef DISABLE_EVENT
1562 uschar * save_name = sender_host_authenticated;
1563 sender_host_authenticated = au->drinst.name;
1564 if ((logmsg = event_raise(sx->conn_args.tblock->event_action,
1565 US"auth:fail", sx->buffer, NULL)))
1566 log_write(0, LOG_MAIN, "%s", logmsg);
1567 sender_host_authenticated = save_name;
1571 log_write(0, LOG_MAIN, "%s authenticator failed H=%s [%s] %s",
1572 au->drinst.name, host->name, host->address, sx->buffer);
1576 /* Failure by some other means. In effect, the authenticator
1577 decided it wasn't prepared to handle this case. Typically this
1578 is the result of "fail" in an expansion string. Do we need to
1579 log anything here? Feb 2006: a message is now put in the buffer
1580 if logging is required. */
1583 if (*sx->buffer != 0)
1584 log_write(0, LOG_MAIN, "%s authenticator cancelled "
1585 "authentication H=%s [%s] %s", au->drinst.name, host->name,
1586 host->address, sx->buffer);
1589 /* Internal problem, message in buffer. */
1592 set_errno_nohost(sx->addrlist, ERRNO_AUTHPROB, string_copy(sx->buffer),
1593 DEFER, FALSE, &sx->delivery_start);
1602 /* Do the client side of smtp-level authentication.
1605 sx smtp connection context
1607 sx->buffer should have the EHLO response from server (gets overwritten)
1610 OK Success, or failed (but not required): global "smtp_authenticated" set
1611 DEFER Failed authentication (and was required)
1612 ERROR Internal problem
1614 FAIL_SEND Failed communications - transmit
1619 smtp_auth(smtp_context * sx)
1621 host_item * host = sx->conn_args.host; /* host to deliver to */
1622 smtp_transport_options_block * ob = sx->conn_args.ob; /* transport options */
1623 int require_auth = verify_check_given_host(CUSS &ob->hosts_require_auth, host);
1624 #ifndef DISABLE_PIPE_CONNECT
1625 unsigned short authbits = tls_out.active.sock >= 0
1626 ? sx->ehlo_resp.crypted_auths : sx->ehlo_resp.cleartext_auths;
1628 uschar * fail_reason = US"server did not advertise AUTH support";
1630 f.smtp_authenticated = FALSE;
1631 client_authenticator = client_authenticated_id = client_authenticated_sender = NULL;
1634 regex_AUTH = regex_must_compile(AUTHS_REGEX, MCS_NOFLAGS, TRUE);
1636 /* Is the server offering AUTH? */
1640 #ifndef DISABLE_PIPE_CONNECT
1641 sx->early_pipe_active ? authbits
1644 regex_match_and_setup(regex_AUTH, sx->buffer, 0, -1)
1647 uschar * names = NULL;
1648 expand_nmax = -1; /* reset */
1650 #ifndef DISABLE_PIPE_CONNECT
1651 if (!sx->early_pipe_active)
1653 names = string_copyn(expand_nstring[1], expand_nlength[1]);
1655 /* Must not do this check until after we have saved the result of the
1656 regex match above as the check could be another RE. */
1658 if ( require_auth == OK
1659 || verify_check_given_host(CUSS &ob->hosts_try_auth, host) == OK)
1661 DEBUG(D_transport) debug_printf("scanning authentication mechanisms\n");
1662 fail_reason = US"no common mechanisms were found";
1664 #ifndef DISABLE_PIPE_CONNECT
1665 if (sx->early_pipe_active)
1667 /* Scan our authenticators (which support use by a client and were offered
1668 by the server (checked at cache-write time)), not suppressed by
1669 client_condition. If one is found, attempt to authenticate by calling its
1670 client function. We are limited to supporting up to 16 authenticator
1671 public-names by the number of bits in a short. */
1677 for (bitnum = 0, au = auths;
1678 !f.smtp_authenticated && au && bitnum < 16;
1679 bitnum++, au = au->drinst.next)
1680 if (authbits & BIT(bitnum))
1682 if ( au->client_condition
1683 && !expand_check_condition(au->client_condition, au->drinst.name,
1684 US"client authenticator"))
1686 DEBUG(D_transport) debug_printf("skipping %s authenticator: %s\n",
1687 au->drinst.name, "client_condition is false");
1691 /* Found data for a listed mechanism. Call its client entry. Set
1692 a flag in the outblock so that data is overwritten after sending so
1693 that reflections don't show it. */
1695 fail_reason = US"authentication attempt(s) failed";
1697 if ((rc = try_authenticator(sx, au)) != OK)
1704 /* Scan the configured authenticators looking for one which is configured
1705 for use as a client, which is not suppressed by client_condition, and
1706 whose name matches an authentication mechanism supported by the server.
1707 If one is found, attempt to authenticate by calling its client function.
1710 for (auth_instance * au = auths; !f.smtp_authenticated && au;
1711 au = au->drinst.next)
1716 || ( au->client_condition
1717 && !expand_check_condition(au->client_condition, au->drinst.name,
1718 US"client authenticator")))
1720 DEBUG(D_transport) debug_printf("skipping %s authenticator: %s\n",
1722 au->client ? "client_condition is false"
1723 : "not configured as a client");
1727 /* Loop to scan supported server mechanisms */
1731 int len = Ustrlen(au->public_name), rc;
1733 Uskip_whitespace(&p);
1735 if (strncmpic(au->public_name, p, len) != 0 ||
1736 (p[len] && !isspace(p[len])))
1738 while (*p && !isspace(*p)) p++;
1742 /* Found data for a listed mechanism. Call its client entry. Set
1743 a flag in the outblock so that data is overwritten after sending so
1744 that reflections don't show it. */
1746 fail_reason = US"authentication attempt(s) failed";
1748 if ((rc = try_authenticator(sx, au)) != OK)
1751 break; /* If not authenticated, try next authenticator */
1752 } /* Loop for scanning supported server mechanisms */
1753 } /* Loop for further authenticators */
1757 /* If we haven't authenticated, but are required to, give up. */
1759 if (require_auth == OK && !f.smtp_authenticated)
1761 #ifndef DISABLE_PIPE_CONNECT
1762 invalidate_ehlo_cache_entry(sx);
1764 set_errno_nohost(sx->addrlist, ERRNO_AUTHFAIL,
1765 string_sprintf("authentication required but %s", fail_reason), DEFER,
1766 FALSE, &sx->delivery_start);
1774 /* Construct AUTH appendix string for MAIL TO */
1777 sx context for smtp connection
1778 p point in sx->buffer to build string
1779 addrlist chain of potential addresses to deliver
1781 Globals f.smtp_authenticated
1782 client_authenticated_sender
1783 Return True on error, otherwise buffer has (possibly empty) terminated string
1787 smtp_mail_auth_str(smtp_context * sx, uschar * p, address_item * addrlist)
1789 smtp_transport_options_block * ob = sx->conn_args.ob;
1790 uschar * local_authenticated_sender = authenticated_sender;
1793 debug_printf("smtp_mail_auth_str: as<%s> os<%s> SA<%s>\n",
1794 authenticated_sender, ob->authenticated_sender, f.smtp_authenticated?"Y":"N");
1797 GET_OPTION("authenticated_sender");
1798 if (ob->authenticated_sender)
1800 uschar * new = expand_string(ob->authenticated_sender);
1803 if (!f.expand_string_forcedfail)
1805 uschar *message = string_sprintf("failed to expand "
1806 "authenticated_sender: %s", expand_string_message);
1807 set_errno_nohost(addrlist, ERRNO_EXPANDFAIL, message, DEFER, FALSE, &sx->delivery_start);
1812 local_authenticated_sender = new;
1815 /* Add the authenticated sender address if present */
1817 if ( (f.smtp_authenticated || ob->authenticated_sender_force)
1818 && local_authenticated_sender)
1820 string_format_nt(p, sizeof(sx->buffer) - (p-sx->buffer), " AUTH=%s",
1821 xtextencode(local_authenticated_sender,
1822 Ustrlen(local_authenticated_sender)));
1823 client_authenticated_sender = string_copy(local_authenticated_sender);
1833 typedef struct smtp_compare_s
1835 const uschar * current_sender_address;
1836 struct transport_instance * tblock;
1840 /* Create a unique string that identifies this message, it is based on
1841 sender_address, helo_data and tls_certificate if enabled.
1845 smtp_local_identity(const uschar * sender, struct transport_instance * tblock)
1847 smtp_transport_options_block * ob = tblock->drinst.options_block;
1848 address_item * addr1;
1849 uschar * if1 = US"";
1850 uschar * helo1 = US"";
1852 uschar * tlsc1 = US"";
1854 const uschar * save_sender_address = sender_address;
1855 uschar * local_identity = NULL;
1857 sender_address = sender;
1859 addr1 = deliver_make_addr (sender, TRUE);
1860 deliver_set_expansions(addr1);
1863 if1 = expand_string(ob->interface);
1866 helo1 = expand_string(ob->helo_data);
1869 if (ob->tls_certificate)
1870 tlsc1 = expand_string(ob->tls_certificate);
1871 local_identity = string_sprintf ("%s^%s^%s", if1, helo1, tlsc1);
1873 local_identity = string_sprintf ("%s^%s", if1, helo1);
1876 deliver_set_expansions(NULL);
1877 sender_address = save_sender_address;
1879 return local_identity;
1884 /* This routine is a callback that is called from transport_check_waiting.
1885 This function will evaluate the incoming message versus the previous
1886 message. If the incoming message is using a different local identity then
1887 we will veto this new message. */
1890 smtp_are_same_identities(uschar * message_id, smtp_compare_t * s_compare)
1892 uschar * message_local_identity,
1893 * current_local_identity,
1894 * new_sender_address;
1896 current_local_identity =
1897 smtp_local_identity(s_compare->current_sender_address, s_compare->tblock);
1899 if (!(new_sender_address = spool_sender_from_msgid(message_id)))
1903 message_local_identity =
1904 smtp_local_identity(new_sender_address, s_compare->tblock);
1906 return Ustrcmp(current_local_identity, message_local_identity) == 0;
1912 ehlo_response(uschar * buf, unsigned checks)
1914 PCRE2_SIZE bsize = Ustrlen(buf);
1915 pcre2_match_data * md = pcre2_match_data_create(1, pcre_gen_ctx);
1917 /* debug_printf("%s: check for 0x%04x\n", __FUNCTION__, checks); */
1920 if ( checks & OPTION_TLS
1921 && pcre2_match(regex_STARTTLS,
1922 (PCRE2_SPTR)buf, bsize, 0, PCRE_EOPT, md, pcre_gen_mtc_ctx) < 0)
1924 checks &= ~OPTION_TLS;
1926 if ( checks & OPTION_IGNQ
1927 && pcre2_match(regex_IGNOREQUOTA,
1928 (PCRE2_SPTR)buf, bsize, 0, PCRE_EOPT, md, pcre_gen_mtc_ctx) < 0)
1929 checks &= ~OPTION_IGNQ;
1931 if ( checks & OPTION_CHUNKING
1932 && pcre2_match(regex_CHUNKING,
1933 (PCRE2_SPTR)buf, bsize, 0, PCRE_EOPT, md, pcre_gen_mtc_ctx) < 0)
1934 checks &= ~OPTION_CHUNKING;
1936 #ifndef DISABLE_PRDR
1937 if ( checks & OPTION_PRDR
1938 && pcre2_match(regex_PRDR,
1939 (PCRE2_SPTR)buf, bsize, 0, PCRE_EOPT, md, pcre_gen_mtc_ctx) < 0)
1941 checks &= ~OPTION_PRDR;
1944 if ( checks & OPTION_UTF8
1945 && pcre2_match(regex_UTF8,
1946 (PCRE2_SPTR)buf, bsize, 0, PCRE_EOPT, md, pcre_gen_mtc_ctx) < 0)
1948 checks &= ~OPTION_UTF8;
1950 if ( checks & OPTION_DSN
1951 && pcre2_match(regex_DSN,
1952 (PCRE2_SPTR)buf, bsize, 0, PCRE_EOPT, md, pcre_gen_mtc_ctx) < 0)
1953 checks &= ~OPTION_DSN;
1955 if ( checks & OPTION_PIPE
1956 && pcre2_match(regex_PIPELINING,
1957 (PCRE2_SPTR)buf, bsize, 0, PCRE_EOPT, md, pcre_gen_mtc_ctx) < 0)
1958 checks &= ~OPTION_PIPE;
1960 if ( checks & OPTION_SIZE
1961 && pcre2_match(regex_SIZE,
1962 (PCRE2_SPTR)buf, bsize, 0, PCRE_EOPT, md, pcre_gen_mtc_ctx) < 0)
1963 checks &= ~OPTION_SIZE;
1965 #ifndef DISABLE_PIPE_CONNECT
1966 if ( checks & OPTION_EARLY_PIPE
1967 && pcre2_match(regex_EARLY_PIPE,
1968 (PCRE2_SPTR)buf, bsize, 0, PCRE_EOPT, md, pcre_gen_mtc_ctx) < 0)
1970 checks &= ~OPTION_EARLY_PIPE;
1972 /* pcre2_match_data_free(md); gen ctx needs no free */
1973 /* debug_printf("%s: found 0x%04x\n", __FUNCTION__, checks); */
1979 /* Callback for emitting a BDAT data chunk header.
1981 If given a nonzero size, first flush any buffered SMTP commands
1982 then emit the command.
1984 Reap previous SMTP command responses if requested, and always reap
1985 the response from a previous BDAT command.
1988 tctx transport context
1989 chunk_size value for SMTP BDAT command
1991 tc_chunk_last add LAST option to SMTP BDAT command
1992 tc_reap_prev reap response to previous SMTP commands
1996 DEFER TLS error on first read (EHLO-resp); errno set
2000 smtp_chunk_cmd_callback(transport_ctx * tctx, unsigned chunk_size,
2003 smtp_transport_options_block * ob = tctx->tblock->drinst.options_block;
2004 smtp_context * sx = tctx->smtp_context;
2008 /* Write SMTP chunk header command. If not reaping responses, note that
2009 there may be more writes (like, the chunk data) done soon. */
2013 #ifndef DISABLE_PIPE_CONNECT
2014 BOOL new_conn = !!(sx->outblock.conn_args);
2016 if((cmd_count = smtp_write_command(sx,
2017 flags & tc_reap_prev ? SCMD_FLUSH : SCMD_MORE,
2018 "BDAT %u%s\r\n", chunk_size, flags & tc_chunk_last ? " LAST" : "")
2019 ) < 0) return ERROR;
2020 if (flags & tc_chunk_last)
2021 data_command = string_copy(big_buffer); /* Save for later error message */
2022 #ifndef DISABLE_PIPE_CONNECT
2023 /* That command write could have been the one that made the connection.
2024 Copy the fd from the client conn ctx (smtp transport specific) to the
2025 generic transport ctx. */
2028 tctx->u.fd = sx->outblock.cctx->sock;
2032 prev_cmd_count = cmd_count += sx->cmd_count;
2034 /* Reap responses for any previous, but not one we just emitted */
2038 if (sx->pending_BDAT)
2041 if (flags & tc_reap_prev && prev_cmd_count > 0)
2043 DEBUG(D_transport) debug_printf("look for %d responses"
2044 " for previous pipelined cmds\n", prev_cmd_count);
2046 switch(sync_responses(sx, prev_cmd_count, 0))
2048 case RESP_BIT_HAD_2XX: /* OK */
2049 case RESP_HAD_2_AND_5: sx->good_RCPT = TRUE; /* OK & progress made */
2050 case RESP_BIT_HAD_5XX: sx->completed_addr = TRUE; /* progress made */
2051 case RESP_NOERROR: break; /* No 2xx or 5xx, but no probs */
2053 case RESP_EHLO_ERR_TLS:errno = ERRNO_TLSFAILURE;
2055 #ifndef DISABLE_PIPE_CONNECT
2056 case RESP_EPIPE_EHLO_ERR: /* non-2xx for pipelined banner or EHLO */
2058 case RESP_RCPT_TIMEO: /* Timeout on RCPT */
2059 default: return ERROR;/* I/O error, or any MAIL/DATA error */
2062 if (!sx->pending_BDAT)
2063 pipelining_active = FALSE;
2066 /* Reap response for an outstanding BDAT */
2068 if (sx->pending_BDAT)
2070 DEBUG(D_transport) debug_printf("look for one response for BDAT\n");
2072 if (!smtp_read_response(sx, sx->buffer, sizeof(sx->buffer), '2',
2073 ob->command_timeout))
2075 if (errno == 0 && sx->buffer[0] == '4')
2077 errno = ERRNO_DATA4XX; /*XXX does this actually get used? */
2078 sx->addrlist->more_errno |=
2079 ((sx->buffer[1] - '0')*10 + sx->buffer[2] - '0') << 8;
2084 sx->pending_BDAT = FALSE;
2085 pipelining_active = FALSE;
2087 else if (chunk_size > 0)
2088 sx->pending_BDAT = TRUE;
2091 sx->cmd_count = cmd_count;
2099 check_force_dane_conn(smtp_context * sx, smtp_transport_options_block * ob)
2102 if( sx->dane_required
2103 || verify_check_given_host(CUSS &ob->hosts_try_dane, sx->conn_args.host) == OK
2105 switch (rc = tlsa_lookup(sx->conn_args.host, &sx->conn_args.tlsa_dnsa, sx->dane_required))
2107 case OK: sx->conn_args.dane = TRUE;
2108 ob->tls_tempfail_tryclear = FALSE; /* force TLS */
2109 ob->tls_sni = sx->conn_args.host->name; /* force SNI */
2111 case FAIL_FORCED: break;
2112 default: set_errno_nohost(sx->addrlist, ERRNO_DNSDEFER,
2113 string_sprintf("DANE error: tlsa lookup %s",
2115 rc, FALSE, &sx->delivery_start);
2116 # ifndef DISABLE_EVENT
2117 (void) event_raise(sx->conn_args.tblock->event_action,
2118 US"dane:fail", sx->dane_required
2119 ? US"dane-required" : US"dnssec-invalid",
2129 /*************************************************
2130 * Make connection for given message *
2131 *************************************************/
2135 sx connection context
2136 suppress_tls if TRUE, don't attempt a TLS connection - this is set for
2137 a second attempt after TLS initialization fails
2139 Returns: OK - the connection was made and the delivery attempted;
2140 fd is set in the conn context, tls_out set up.
2141 DEFER - the connection could not be made, or something failed
2142 while setting up the SMTP session, or there was a
2143 non-message-specific error, such as a timeout.
2144 ERROR - helo_data or add_headers or authenticated_sender is
2145 specified for this transport, and the string failed
2149 smtp_setup_conn(smtp_context * sx, BOOL suppress_tls)
2151 smtp_transport_options_block * ob = sx->conn_args.tblock->drinst.options_block;
2152 BOOL pass_message = FALSE;
2153 uschar * message = NULL;
2156 uschar * tls_errstr;
2159 /* Many lines of clearing individual elements of *sx that used to
2160 be here have been replaced by a full memset to zero (de41aff051).
2161 There are two callers, this file and verify.c . Now we only set
2162 up nonzero elements. */
2164 sx->conn_args.ob = ob;
2166 sx->lmtp = strcmpic(ob->protocol, US"lmtp") == 0;
2167 sx->smtps = strcmpic(ob->protocol, US"smtps") == 0;
2168 sx->send_rset = TRUE;
2169 sx->send_quit = TRUE;
2170 sx->setting_up = TRUE;
2172 sx->dsn_all_lasthop = TRUE;
2175 verify_check_given_host(CUSS &ob->hosts_require_dane, sx->conn_args.host) == OK;
2178 if ((sx->max_mail = sx->conn_args.tblock->connection_max_messages) == 0)
2179 sx->max_mail = UNLIMITED_ADDRS;
2180 sx->max_rcpt = expand_max_rcpt(sx->conn_args.tblock->max_addresses);
2181 sx->igquotstr = US"";
2182 if (!sx->helo_data) sx->helo_data = ob->helo_data;
2184 smtp_command = US"initial connection";
2186 /* Set up the buffer for reading SMTP response packets. */
2188 sx->inblock.buffer = sx->inbuffer;
2189 sx->inblock.buffersize = sizeof(sx->inbuffer);
2190 sx->inblock.ptr = sx->inbuffer;
2191 sx->inblock.ptrend = sx->inbuffer;
2193 /* Set up the buffer for holding SMTP commands while pipelining */
2195 sx->outblock.buffer = sx->outbuffer;
2196 sx->outblock.buffersize = sizeof(sx->outbuffer);
2197 sx->outblock.ptr = sx->outbuffer;
2199 /* Reset the parameters of a TLS session. */
2202 tls_out.cipher = NULL; /* the one we may use for this transport */
2203 tls_out.ourcert = NULL;
2204 tls_out.peercert = NULL;
2205 tls_out.peerdn = NULL;
2209 tls_out.ocsp = OCSP_NOT_REQ;
2210 #ifndef DISABLE_TLS_RESUME
2211 tls_out.resumption = 0;
2215 /* Flip the legacy TLS-related variables over to the outbound set in case
2216 they're used in the context of the transport. Don't bother resetting
2217 afterward (when being used by a transport) as we're in a subprocess.
2218 For verify, unflipped once the callout is dealt with */
2220 tls_modify_variables(&tls_out);
2225 set_errno_nohost(sx->addrlist, ERRNO_TLSFAILURE, US"TLS support not available",
2226 DEFER, FALSE, &sx->delivery_start);
2231 /* If we have a proxied TLS connection, check usability for this message */
2233 if (continue_hostname && continue_proxy_cipher)
2236 const uschar * sni = US"";
2238 # ifdef SUPPORT_DANE
2239 /* Check if the message will be DANE-verified; if so force TLS and its SNI */
2241 tls_out.dane_verified = FALSE;
2242 smtp_port_for_connect(sx->conn_args.host, sx->port);
2243 if ( sx->conn_args.host->dnssec == DS_YES
2244 && (rc = check_force_dane_conn(sx, ob)) != OK
2249 /* If the SNI or the DANE status required for the new message differs from the
2250 existing conn drop the connection to force a new one. */
2252 if (ob->tls_sni && !(sni = expand_cstring(ob->tls_sni)))
2253 log_write(0, LOG_MAIN|LOG_PANIC,
2254 "<%s>: failed to expand transport's tls_sni value: %s",
2255 sx->addrlist->address, expand_string_message);
2257 # ifdef SUPPORT_DANE
2258 if ( (continue_proxy_sni ? (Ustrcmp(continue_proxy_sni, sni) == 0) : !*sni)
2259 && continue_proxy_dane == sx->conn_args.dane)
2261 tls_out.sni = US sni;
2262 if ((tls_out.dane_verified = continue_proxy_dane))
2263 sx->conn_args.host->dnssec = DS_YES;
2266 if ((continue_proxy_sni ? (Ustrcmp(continue_proxy_sni, sni) == 0) : !*sni))
2267 tls_out.sni = US sni;
2272 # ifdef SUPPORT_DANE
2273 if (continue_proxy_dane != sx->conn_args.dane)
2275 "Closing proxied-TLS connection due to dane requirement mismatch\n");
2278 debug_printf("Closing proxied-TLS connection (SNI '%s') "
2279 "due to SNI mismatch (transport requirement '%s')\n",
2280 continue_proxy_sni, sni);
2282 smtp_debug_cmd(US"QUIT", 0);
2283 write(0, "QUIT\r\n", 6);
2285 continue_hostname = continue_proxy_cipher = NULL;
2286 f.continue_more = FALSE;
2287 continue_sequence = 1; /* Ensure proper logging of non-cont-conn */
2290 #endif /*!DISABLE_TLS*/
2292 /* Make a connection to the host if this isn't a continued delivery, and handle
2293 the initial interaction and HELO/EHLO/LHLO. Connect timeout errors are handled
2294 specially so they can be identified for retries. */
2296 if (!continue_hostname)
2298 if (sx->verify) HDEBUG(D_verify)
2299 debug_printf("interface=%s port=%d\n", sx->conn_args.interface, sx->port);
2301 /* Get the actual port the connection will use, into sx->conn_args.host */
2303 smtp_port_for_connect(sx->conn_args.host, sx->port);
2306 /* Do TLSA lookup for DANE */
2308 tls_out.dane_verified = FALSE;
2309 tls_out.tlsa_usage = 0;
2311 if (sx->conn_args.host->dnssec == DS_YES)
2314 if ((rc = check_force_dane_conn(sx, ob)) != OK)
2317 else if (sx->dane_required)
2319 set_errno_nohost(sx->addrlist, ERRNO_DNSDEFER,
2320 string_sprintf("DANE error: %s lookup not DNSSEC", sx->conn_args.host->name),
2321 FAIL, FALSE, &sx->delivery_start);
2322 # ifndef DISABLE_EVENT
2323 (void) event_raise(sx->conn_args.tblock->event_action,
2324 US"dane:fail", US"dane-required", NULL);
2328 else DEBUG(D_transport)
2329 debug_printf("lack of DNSSEC traceability precludes DANE\n");
2333 /* Make the TCP connection */
2335 sx->cctx.tls_ctx = NULL;
2336 sx->inblock.cctx = sx->outblock.cctx = &sx->cctx;
2337 #ifndef DISABLE_ESMTP_LIMITS
2338 sx->peer_limit_mail = sx->peer_limit_rcpt = sx->peer_limit_rcptdom =
2340 sx->avoid_option = sx->peer_offered = smtp_peer_options = 0;
2341 smtp_debug_cmd_log_init();
2343 #ifndef DISABLE_PIPE_CONNECT
2344 if ( verify_check_given_host(CUSS &ob->hosts_pipe_connect,
2345 sx->conn_args.host) == OK)
2347 /* We don't find out the local ip address until the connect, so if
2348 the helo string might use it avoid doing early-pipelining. */
2351 || sx->conn_args.interface
2352 || !Ustrstr(sx->helo_data, "$sending_ip_address")
2353 || Ustrstr(sx->helo_data, "def:sending_ip_address")
2356 sx->early_pipe_ok = TRUE;
2357 if ( read_ehlo_cache_entry(sx)
2358 && sx->ehlo_resp.cleartext_features & OPTION_EARLY_PIPE)
2361 debug_printf("Using cached cleartext PIPECONNECT\n");
2362 sx->early_pipe_active = TRUE;
2363 sx->peer_offered = sx->ehlo_resp.cleartext_features;
2366 else DEBUG(D_transport)
2367 debug_printf("helo needs $sending_ip_address; avoid early-pipelining\n");
2370 if (sx->early_pipe_active)
2372 sx->outblock.conn_args = &sx->conn_args;
2373 (void) smtp_boundsock(&sx->conn_args);
2378 blob lazy_conn = {.data = NULL};
2379 /* For TLS-connect, a TFO lazy-connect is useful since the Client Hello
2380 can go on the TCP SYN. */
2382 if ((sx->cctx.sock = smtp_connect(&sx->conn_args,
2383 sx->smtps ? &lazy_conn : NULL)) < 0)
2385 set_errno_nohost(sx->addrlist,
2386 errno == ETIMEDOUT ? ERRNO_CONNECTTIMEOUT : errno,
2387 sx->verify ? US strerror(errno) : NULL,
2388 DEFER, FALSE, &sx->delivery_start);
2389 sx->send_quit = FALSE;
2393 (void) setsockopt(sx->cctx.sock, IPPROTO_TCP, TCP_QUICKACK, US &off,
2397 /* Expand the greeting message while waiting for the initial response. (Makes
2398 sense if helo_data contains ${lookup dnsdb ...} stuff). The expansion is
2399 delayed till here so that $sending_ip_address and $sending_port are set.
2400 Those will be known even for a TFO lazy-connect, having been set by the bind().
2401 For early-pipe, we are ok if binding to a local interface; otherwise (if
2402 $sending_ip_address is seen in helo_data) we disabled early-pipe above. */
2404 GET_OPTION("helo_data");
2406 if (!(sx->helo_data = expand_string(sx->helo_data)))
2408 log_write(0, LOG_MAIN|LOG_PANIC,
2409 "<%s>: failed to expand transport's helo_data value for callout: %s",
2410 sx->addrlist->address, expand_string_message);
2415 expand_string_message = NULL;
2416 if ((sx->helo_data = string_domain_utf8_to_alabel(sx->helo_data,
2417 &expand_string_message)),
2418 expand_string_message)
2420 log_write(0, LOG_MAIN|LOG_PANIC,
2421 "<%s>: failed to expand transport's helo_data value for callout: %s",
2422 sx->addrlist->address, expand_string_message);
2424 sx->helo_data = NULL;
2428 /* The first thing is to wait for an initial OK response. The dreaded "goto"
2429 is nevertheless a reasonably clean way of programming this kind of logic,
2430 where you want to escape on any error. */
2434 #ifndef DISABLE_PIPE_CONNECT
2435 if (sx->early_pipe_active)
2437 sx->pending_BANNER = TRUE; /* sync_responses() must eventually handle */
2438 sx->outblock.cmd_count = 1;
2443 if (!smtp_reap_banner(sx))
2444 goto RESPONSE_FAILED;
2447 #ifndef DISABLE_EVENT
2450 lookup_dnssec_authenticated = sx->conn_args.host->dnssec==DS_YES ? US"yes"
2451 : sx->conn_args.host->dnssec==DS_NO ? US"no" : NULL;
2452 s = event_raise(sx->conn_args.tblock->event_action, US"smtp:connect", sx->buffer, NULL);
2455 set_errno_nohost(sx->addrlist, ERRNO_EXPANDFAIL,
2456 string_sprintf("deferred by smtp:connect event expansion: %s", s),
2457 DEFER, FALSE, &sx->delivery_start);
2464 /* Now check if the helo_data expansion went well, and sign off cleanly if
2469 message = string_sprintf("failed to expand helo_data: %s",
2470 expand_string_message);
2471 set_errno_nohost(sx->addrlist, ERRNO_EXPANDFAIL, message, DEFER, FALSE, &sx->delivery_start);
2477 /** Debugging without sending a message
2478 sx->addrlist->transport_return = DEFER;
2482 /* Errors that occur after this point follow an SMTP command, which is
2483 left in big_buffer by smtp_write_command() for use in error messages. */
2485 smtp_command = big_buffer;
2487 /* Tell the remote who we are...
2489 February 1998: A convention has evolved that ESMTP-speaking MTAs include the
2490 string "ESMTP" in their greeting lines, so make Exim send EHLO if the
2491 greeting is of this form. The assumption was that the far end supports it
2492 properly... but experience shows that there are some that give 5xx responses,
2493 even though the banner includes "ESMTP" (there's a bloody-minded one that
2494 says "ESMTP not spoken here"). Cope with that case.
2496 September 2000: Time has passed, and it seems reasonable now to always send
2497 EHLO at the start. It is also convenient to make the change while installing
2500 July 2003: Joachim Wieland met a broken server that advertises "PIPELINING"
2501 but times out after sending MAIL FROM, RCPT TO and DATA all together. There
2502 would be no way to send out the mails, so there is now a host list
2503 "hosts_avoid_esmtp" that disables ESMTP for special hosts and solves the
2504 PIPELINING problem as well. Maybe it can also be useful to cure other
2505 problems with broken servers.
2507 Exim originally sent "Helo" at this point and ran for nearly a year that way.
2508 Then somebody tried it with a Microsoft mailer... It seems that all other
2509 mailers use upper case for some reason (the RFC is quite clear about case
2510 independence) so, for peace of mind, I gave in. */
2512 sx->esmtp = verify_check_given_host(CUSS &ob->hosts_avoid_esmtp, sx->conn_args.host) != OK;
2514 /* Alas; be careful, since this goto is not an error-out, so conceivably
2515 we might set data between here and the target which we assume to exist
2516 and be usable. I can see this coming back to bite us. */
2522 smtp_peer_options |= OPTION_TLS;
2523 suppress_tls = FALSE;
2524 ob->tls_tempfail_tryclear = FALSE;
2525 smtp_command = US"SSL-on-connect";
2527 # ifndef DISABLE_TLS_RESUME
2528 /* Having no EHLO response yet, cannot peek there for a servername to detect
2529 an LB. Call this anyway, so that a dummy host_name_extract option value can
2530 force resumption attempts. */
2532 GET_OPTION("host_name_extract");
2533 if (!(s = ob->host_name_extract)) s = US"never-LB";
2534 ehlo_response_lbserver(sx, s);
2542 if (smtp_write_command(sx,
2543 #ifndef DISABLE_PIPE_CONNECT
2544 sx->early_pipe_active ? SCMD_BUFFER :
2547 "%s %s\r\n", sx->lmtp ? "LHLO" : "EHLO", sx->helo_data) < 0)
2549 sx->esmtp_sent = TRUE;
2551 #ifndef DISABLE_PIPE_CONNECT
2552 if (sx->early_pipe_active)
2554 sx->pending_EHLO = TRUE;
2556 /* If we have too many authenticators to handle and might need to AUTH
2557 for this transport, pipeline no further as we will need the
2558 list of auth methods offered. Reap the banner and EHLO. */
2560 if ( (ob->hosts_require_auth || ob->hosts_try_auth)
2561 && f.smtp_in_early_pipe_no_auth)
2564 debug_printf("may need to auth, so pipeline no further\n");
2565 if (smtp_write_command(sx, SCMD_FLUSH, NULL) < 0)
2567 if (sync_responses(sx, 2, 0) != RESP_NOERROR)
2570 debug_printf("failed reaping pipelined cmd responses\n");
2571 goto RESPONSE_FAILED;
2573 sx->early_pipe_active = FALSE;
2578 if (!smtp_reap_ehlo(sx))
2579 goto RESPONSE_FAILED;
2583 debug_printf("not sending EHLO (host matches hosts_avoid_esmtp)\n");
2585 #ifndef DISABLE_PIPE_CONNECT
2586 if (!sx->early_pipe_active)
2591 int n = sizeof(sx->buffer);
2592 uschar * rsp = sx->buffer;
2594 if (sx->esmtp_sent && (n = Ustrlen(sx->buffer) + 1) < sizeof(sx->buffer)/2)
2595 { rsp = sx->buffer + n; n = sizeof(sx->buffer) - n; }
2597 if (smtp_write_command(sx, SCMD_FLUSH, "HELO %s\r\n", sx->helo_data) < 0)
2599 good_response = smtp_read_response(sx, rsp, n, '2', ob->command_timeout);
2600 #ifdef EXPERIMENTAL_DSN_INFO
2601 sx->helo_response = string_copy(rsp);
2605 /* Handle special logging for a closed connection after HELO
2606 when had previously sent EHLO */
2608 if (rsp != sx->buffer && rsp[0] == 0 && (errno == 0 || errno == ECONNRESET))
2610 errno = ERRNO_SMTPCLOSED;
2611 goto EHLOHELO_FAILED;
2613 memmove(sx->buffer, rsp, Ustrlen(rsp));
2614 goto RESPONSE_FAILED;
2618 if (sx->esmtp || sx->lmtp)
2620 #ifndef DISABLE_PIPE_CONNECT
2621 if (!sx->early_pipe_active)
2626 sx->peer_offered = ehlo_response(sx->buffer,
2627 OPTION_TLS /* others checked later */
2628 #ifndef DISABLE_PIPE_CONNECT
2629 | (sx->early_pipe_ok
2631 | OPTION_CHUNKING | OPTION_PRDR | OPTION_DSN | OPTION_PIPE | OPTION_SIZE
2640 #ifndef DISABLE_ESMTP_LIMITS
2641 if (tls_out.active.sock >= 0 || !(sx->peer_offered & OPTION_TLS))
2643 ehlo_response_limits_read(sx);
2644 ehlo_response_limits_apply(sx);
2647 #ifndef DISABLE_PIPE_CONNECT
2648 if (sx->early_pipe_ok)
2650 sx->ehlo_resp.cleartext_features = sx->peer_offered;
2652 if ( (sx->peer_offered & (OPTION_PIPE | OPTION_EARLY_PIPE))
2653 == (OPTION_PIPE | OPTION_EARLY_PIPE))
2656 debug_printf("PIPECONNECT usable in future for this IP\n");
2657 sx->ehlo_resp.cleartext_auths = study_ehlo_auths(sx);
2658 write_ehlo_cache_entry(sx);
2662 #if !defined(DISABLE_TLS) && !defined(DISABLE_TLS_RESUME)
2663 GET_OPTION("host_name_extract");
2664 if (!(s = ob->host_name_extract)) s = HNE_DEFAULT;
2665 ehlo_response_lbserver(sx, s);
2669 /* Set tls_offered if the response to EHLO specifies support for STARTTLS. */
2672 smtp_peer_options |= sx->peer_offered & OPTION_TLS;
2677 /* For continuing deliveries down the same channel, the socket
2678 is the standard input; for a socket held open from verify it is recorded
2679 in the cutthrough context block. Either way we don't need to redo EHLO here
2680 (but may need to do so for TLS - see below).
2681 Set up the pointer "smtp_command" to where subsequent commands will be left,
2682 for error messages. Other stuff was set up for us by the delivery process. */
2684 /*XXX continue case needs to propagate DSN_INFO, prob. in deliver.c
2685 as the continue goes via pass-fd to the delivery process.
2686 It does not wait. Unclear how we keep separate host's responses
2687 separate - we could match up by host ip+port as a bodge. */
2691 if (cutthrough.cctx.sock >= 0 && cutthrough.callout_hold_only)
2693 sx->cctx = cutthrough.cctx;
2694 sx->conn_args.host->port = sx->port = cutthrough.host.port;
2698 sx->cctx.sock = 0; /* stdin */
2699 sx->cctx.tls_ctx = NULL;
2700 smtp_port_for_connect(sx->conn_args.host, sx->port); /* Record the port that was used */
2702 smtp_command = big_buffer;
2703 sx->inblock.cctx = sx->outblock.cctx = &sx->cctx;
2704 sx->peer_offered = smtp_peer_options;
2705 #ifndef DISABLE_ESMTP_LIMITS
2706 /* Limits passed by cmdline over exec. */
2707 ehlo_limits_apply(sx,
2708 sx->peer_limit_mail = continue_limit_mail,
2709 sx->peer_limit_rcpt = continue_limit_rcpt,
2710 sx->peer_limit_rcptdom = continue_limit_rcptdom);
2712 sx->helo_data = NULL; /* ensure we re-expand ob->helo_data */
2714 /* For a continued connection with TLS being proxied for us, or a
2715 held-open verify connection with TLS, nothing more to do. */
2717 if ( continue_proxy_cipher
2718 || (cutthrough.cctx.sock >= 0 && cutthrough.callout_hold_only
2719 && cutthrough.is_tls)
2722 sx->pipelining_used = pipelining_active = !!(smtp_peer_options & OPTION_PIPE);
2723 HDEBUG(D_transport) debug_printf("continued connection, %s TLS\n",
2724 continue_proxy_cipher ? "proxied" : "verify conn with");
2726 tls_out.certificate_verified = !!(continue_flags & CTF_CV);
2728 tls_out.dane_verified = !!(continue_flags & CTF_DV);
2730 #ifndef DISABLE_TLS_RESUME
2731 if (continue_flags & CTF_TR) tls_out.resumption |= RESUME_USED;
2735 HDEBUG(D_transport) debug_printf("continued connection, no TLS\n");
2738 /* If TLS is available on this connection, whether continued or not, attempt to
2739 start up a TLS session, unless the host is in hosts_avoid_tls. If successful,
2740 send another EHLO - the server may give a different answer in secure mode. We
2741 use a separate buffer for reading the response to STARTTLS so that if it is
2742 negative, the original EHLO data is available for subsequent analysis, should
2743 the client not be required to use TLS. If the response is bad, copy the buffer
2744 for error analysis. */
2747 if ( smtp_peer_options & OPTION_TLS
2749 && verify_check_given_host(CUSS &ob->hosts_avoid_tls, sx->conn_args.host) != OK
2751 || verify_check_given_host(CUSS &ob->hosts_verify_avoid_tls, sx->conn_args.host) != OK
2754 uschar buffer2[4096];
2756 if (smtp_write_command(sx, SCMD_FLUSH, "STARTTLS\r\n") < 0)
2759 #ifndef DISABLE_PIPE_CONNECT
2760 /* If doing early-pipelining reap the banner and EHLO-response but leave
2761 the response for the STARTTLS we just sent alone. On fail, assume wrong
2762 cached capability and retry with the pipelining disabled. */
2764 if (sx->early_pipe_active)
2766 if (sync_responses(sx, 2, 0) != RESP_NOERROR)
2769 debug_printf("failed reaping pipelined cmd responses\n");
2770 close(sx->cctx.sock);
2772 sx->early_pipe_active = FALSE;
2773 goto PIPE_CONNECT_RETRY;
2778 /* If there is an I/O error, transmission of this message is deferred. If
2779 there is a temporary rejection of STARRTLS and tls_tempfail_tryclear is
2780 false, we also defer. However, if there is a temporary rejection of STARTTLS
2781 and tls_tempfail_tryclear is true, or if there is an outright rejection of
2782 STARTTLS, we carry on. This means we will try to send the message in clear,
2783 unless the host is in hosts_require_tls (tested below). */
2785 if (!smtp_read_response(sx, buffer2, sizeof(buffer2), '2', ob->command_timeout))
2789 || (buffer2[0] == '4' && !ob->tls_tempfail_tryclear)
2792 Ustrncpy(sx->buffer, buffer2, sizeof(sx->buffer));
2793 sx->buffer[sizeof(sx->buffer)-1] = '\0';
2794 goto RESPONSE_FAILED;
2798 /* STARTTLS accepted: try to negotiate a TLS session. */
2803 sx->conn_args.sending_ip_address = sending_ip_address;
2804 if (!tls_client_start(&sx->cctx, &sx->conn_args, sx->addrlist, &tls_out, &tls_errstr))
2806 /* TLS negotiation failed; give an error. From outside, this function may
2807 be called again to try in clear on a new connection, if the options permit
2808 it for this host. */
2810 DEBUG(D_tls) debug_printf("TLS session fail: %s\n", tls_errstr);
2812 # ifdef SUPPORT_DANE
2813 if (sx->conn_args.dane)
2815 log_write(0, LOG_MAIN,
2816 "DANE attempt failed; TLS connection to %s [%s]: %s",
2817 sx->conn_args.host->name, sx->conn_args.host->address, tls_errstr);
2818 # ifndef DISABLE_EVENT
2819 (void) event_raise(sx->conn_args.tblock->event_action,
2820 US"dane:fail", US"validation-failure", NULL); /* could do with better detail */
2825 errno = ERRNO_TLSFAILURE;
2826 message = string_sprintf("TLS session: %s", tls_errstr);
2827 sx->send_quit = FALSE;
2830 sx->send_tlsclose = TRUE;
2832 /* TLS session is set up. Check the inblock fill level. If there is
2833 content then as we have not yet done a tls read it must have arrived before
2834 the TLS handshake, in-clear. That violates the sync requirement of the
2835 STARTTLS RFC, so fail. */
2837 if (sx->inblock.ptr != sx->inblock.ptrend)
2841 int i = sx->inblock.ptrend - sx->inblock.ptr;
2842 debug_printf("unused data in input buffer after ack for STARTTLS:\n"
2844 i > 100 ? 100 : i, sx->inblock.ptr, i > 100 ? "..." : "");
2846 tls_errstr = US"synch error before connect";
2847 goto TLS_CONN_FAILED;
2850 smtp_peer_options_wrap = smtp_peer_options;
2851 for (address_item * addr = sx->addrlist; addr; addr = addr->next)
2852 if (addr->transport_return == PENDING_DEFER)
2854 addr->cipher = tls_out.cipher;
2855 addr->ourcert = tls_out.ourcert;
2856 addr->peercert = tls_out.peercert;
2857 addr->peerdn = tls_out.peerdn;
2858 addr->ocsp = tls_out.ocsp;
2859 addr->tlsver = tls_out.ver;
2864 /* if smtps, we'll have smtp_command set to something else; always safe to
2866 smtp_command = big_buffer;
2868 /* If we started TLS, redo the EHLO/LHLO exchange over the secure channel. If
2869 helo_data is null, we are dealing with a connection that was passed from
2870 another process, and so we won't have expanded helo_data above. We have to
2871 expand it here. $sending_ip_address and $sending_port are set up right at the
2872 start of the Exim process (in exim.c). */
2874 if (tls_out.active.sock >= 0)
2876 uschar * greeting_cmd;
2880 GET_OPTION("helo_data");
2881 if (!(sx->helo_data = expand_string(ob->helo_data)))
2883 uschar *message = string_sprintf("failed to expand helo_data: %s",
2884 expand_string_message);
2885 set_errno_nohost(sx->addrlist, ERRNO_EXPANDFAIL, message, DEFER, FALSE, &sx->delivery_start);
2891 #ifndef DISABLE_PIPE_CONNECT
2892 /* For SMTPS there is no cleartext early-pipe; use the crypted permission bit.
2893 We're unlikely to get the group sent and delivered before the server sends its
2894 banner, but it's still worth sending as a group.
2895 For STARTTLS allow for cleartext early-pipe but no crypted early-pipe, but not
2898 if (sx->smtps ? sx->early_pipe_ok : sx->early_pipe_active)
2900 sx->peer_offered = sx->ehlo_resp.crypted_features;
2901 if ((sx->early_pipe_active =
2902 !!(sx->ehlo_resp.crypted_features & OPTION_EARLY_PIPE)))
2903 DEBUG(D_transport) debug_printf("Using cached crypted PIPECONNECT\n");
2906 #ifdef EXPERIMMENTAL_ESMTP_LIMITS
2907 /* As we are about to send another EHLO, forget any LIMITS received so far. */
2908 sx->peer_limit_mail = sx->peer_limit_rcpt = sx->peer_limit_rcptdom = 0;
2909 if ((sx->max_mail = sx->conn_args.tblock->connection_max_message) == 0)
2910 sx->max_mail = UNLIMITED_ADDRS;
2911 sx->max_rcpt = expand_max_rcpt(sx->conn_args.tblock->max_addresses);
2912 sx->single_rcpt_domain = FALSE;
2915 /* For SMTPS we need to wait for the initial OK response. */
2917 #ifndef DISABLE_PIPE_CONNECT
2918 if (sx->early_pipe_active)
2920 sx->pending_BANNER = TRUE;
2921 sx->outblock.cmd_count = 1;
2925 if (!smtp_reap_banner(sx))
2926 goto RESPONSE_FAILED;
2929 greeting_cmd = US"LHLO";
2931 greeting_cmd = US"EHLO";
2934 greeting_cmd = US"HELO";
2936 debug_printf("not sending EHLO (host matches hosts_avoid_esmtp)\n");
2939 if (smtp_write_command(sx,
2940 #ifndef DISABLE_PIPE_CONNECT
2941 sx->early_pipe_active ? SCMD_BUFFER :
2944 "%s %s\r\n", greeting_cmd, sx->helo_data) < 0)
2947 #ifndef DISABLE_PIPE_CONNECT
2948 if (sx->early_pipe_active)
2949 sx->pending_EHLO = TRUE;
2953 if (!smtp_reap_ehlo(sx))
2956 /* The GnuTLS layer in Exim only spots a server-rejection of a client
2957 cert late, under TLS1.3 - which means here; the first time we try to
2958 receive crypted data. Treat it as if it was a connect-time failure.
2959 See also the early-pipe equivalent... which will be hard; every call
2960 to sync_responses will need to check the result.
2961 It would be nicer to have GnuTLS check the cert during the handshake.
2962 Can it do that, with all the flexibility we need? */
2964 tls_errstr = US"error on first read";
2965 goto TLS_CONN_FAILED;
2968 goto RESPONSE_FAILED;
2970 smtp_peer_options = 0;
2974 /* If the host is required to use a secure channel, ensure that we
2978 # ifdef SUPPORT_DANE
2979 || sx->conn_args.dane
2981 || verify_check_given_host(CUSS &ob->hosts_require_tls, sx->conn_args.host) == OK
2984 errno = ERRNO_TLSREQUIRED;
2985 message = string_sprintf("a TLS session is required, but %s",
2986 smtp_peer_options & OPTION_TLS
2987 ? "an attempt to start TLS failed" : "the server did not offer TLS support");
2988 # if defined(SUPPORT_DANE) && !defined(DISABLE_EVENT)
2989 if (sx->conn_args.dane)
2990 (void) event_raise(sx->conn_args.tblock->event_action, US"dane:fail",
2991 smtp_peer_options & OPTION_TLS
2992 ? US"validation-failure" /* could do with better detail */
2993 : US"starttls-not-supported",
2998 #endif /*DISABLE_TLS*/
3000 /* If TLS is active, we have just started it up and re-done the EHLO command,
3001 so its response needs to be analyzed. If TLS is not active and this is a
3002 continued session down a previously-used socket, we haven't just done EHLO, so
3005 if ( !continue_hostname
3007 || tls_out.active.sock >= 0
3011 if (sx->esmtp || sx->lmtp)
3013 #ifndef DISABLE_PIPE_CONNECT
3014 if (!sx->early_pipe_active)
3017 sx->peer_offered = ehlo_response(sx->buffer,
3019 #ifndef DISABLE_PIPE_CONNECT
3020 | (sx->lmtp && ob->lmtp_ignore_quota ? OPTION_IGNQ : 0)
3021 | OPTION_DSN | OPTION_PIPE | OPTION_SIZE
3022 | OPTION_CHUNKING | OPTION_PRDR | OPTION_UTF8
3023 | (tls_out.active.sock >= 0 ? OPTION_EARLY_PIPE : 0) /* not for lmtp */
3027 | (sx->lmtp && ob->lmtp_ignore_quota ? OPTION_IGNQ : 0)
3030 # ifdef SUPPORT_I18N
3031 | (sx->addrlist->prop.utf8_msg ? OPTION_UTF8 : 0)
3032 /*XXX if we hand peercaps on to continued-conn processes,
3033 must not depend on this addr */
3037 | (ob->size_addition >= 0 ? OPTION_SIZE : 0)
3040 #ifndef DISABLE_PIPE_CONNECT
3041 if (tls_out.active.sock >= 0)
3042 sx->ehlo_resp.crypted_features = sx->peer_offered;
3045 #ifndef DISABLE_ESMTP_LIMITS
3046 if (tls_out.active.sock >= 0 || !(sx->peer_offered & OPTION_TLS))
3048 ehlo_response_limits_read(sx);
3049 ehlo_response_limits_apply(sx);
3054 /* Set for IGNOREQUOTA if the response to LHLO specifies support and the
3055 lmtp_ignore_quota option was set. */
3057 sx->igquotstr = sx->peer_offered & OPTION_IGNQ ? US" IGNOREQUOTA" : US"";
3059 /* If the response to EHLO specified support for the SIZE parameter, note
3060 this, provided size_addition is non-negative. */
3062 smtp_peer_options |= sx->peer_offered & OPTION_SIZE;
3064 /* Note whether the server supports PIPELINING. If hosts_avoid_esmtp matched
3065 the current host, esmtp will be false, so PIPELINING can never be used. If
3066 the current host matches hosts_avoid_pipelining, don't do it. */
3068 if ( sx->peer_offered & OPTION_PIPE
3069 && verify_check_given_host(CUSS &ob->hosts_avoid_pipelining, sx->conn_args.host) != OK)
3070 smtp_peer_options |= OPTION_PIPE;
3072 DEBUG(D_transport) debug_printf("%susing PIPELINING\n",
3073 smtp_peer_options & OPTION_PIPE ? "" : "not ");
3075 if ( sx->peer_offered & OPTION_CHUNKING
3076 && verify_check_given_host(CUSS &ob->hosts_try_chunking, sx->conn_args.host) == OK)
3077 smtp_peer_options |= OPTION_CHUNKING;
3079 if (smtp_peer_options & OPTION_CHUNKING)
3080 DEBUG(D_transport) debug_printf("CHUNKING usable\n");
3082 #ifndef DISABLE_PRDR
3083 if ( sx->peer_offered & OPTION_PRDR
3084 && verify_check_given_host(CUSS &ob->hosts_try_prdr, sx->conn_args.host) == OK)
3085 smtp_peer_options |= OPTION_PRDR;
3087 if (smtp_peer_options & OPTION_PRDR)
3088 DEBUG(D_transport) debug_printf("PRDR usable\n");
3091 /* Note if the server supports DSN */
3092 smtp_peer_options |= sx->peer_offered & OPTION_DSN;
3093 DEBUG(D_transport) debug_printf("%susing DSN\n",
3094 sx->peer_offered & OPTION_DSN ? "" : "not ");
3096 #ifndef DISABLE_PIPE_CONNECT
3097 if ( sx->early_pipe_ok
3098 && !sx->early_pipe_active
3099 && tls_out.active.sock >= 0
3100 && smtp_peer_options & OPTION_PIPE
3101 && ( sx->ehlo_resp.cleartext_features | sx->ehlo_resp.crypted_features)
3102 & OPTION_EARLY_PIPE)
3104 DEBUG(D_transport) debug_printf("PIPECONNECT usable in future for this IP\n");
3105 sx->ehlo_resp.crypted_auths = study_ehlo_auths(sx);
3106 write_ehlo_cache_entry(sx);
3110 /* Note if the response to EHLO specifies support for the AUTH extension.
3111 If it has, check that this host is one we want to authenticate to, and do
3112 the business. The host name and address must be available when the
3113 authenticator's client driver is running. */
3115 switch (yield = smtp_auth(sx))
3117 default: goto SEND_QUIT;
3119 case FAIL_SEND: goto SEND_FAILED;
3120 case FAIL: goto RESPONSE_FAILED;
3124 sx->pipelining_used = pipelining_active = !!(smtp_peer_options & OPTION_PIPE);
3126 /* The setting up of the SMTP call is now complete. Any subsequent errors are
3127 message-specific. */
3129 sx->setting_up = FALSE;
3132 if (sx->addrlist->prop.utf8_msg)
3136 /* If the transport sets a downconversion mode it overrides any set by ACL
3139 GET_OPTION("utf8_downconvert");
3140 if ((s = ob->utf8_downconvert))
3142 if (!(s = expand_string(s)))
3144 message = string_sprintf("failed to expand utf8_downconvert: %s",
3145 expand_string_message);
3146 set_errno_nohost(sx->addrlist, ERRNO_EXPANDFAIL, message, DEFER, FALSE, &sx->delivery_start);
3152 case '1': sx->addrlist->prop.utf8_downcvt = TRUE;
3153 sx->addrlist->prop.utf8_downcvt_maybe = FALSE;
3155 case '0': sx->addrlist->prop.utf8_downcvt = FALSE;
3156 sx->addrlist->prop.utf8_downcvt_maybe = FALSE;
3158 case '-': if (s[1] == '1')
3160 sx->addrlist->prop.utf8_downcvt = FALSE;
3161 sx->addrlist->prop.utf8_downcvt_maybe = TRUE;
3167 sx->utf8_needed = !sx->addrlist->prop.utf8_downcvt
3168 && !sx->addrlist->prop.utf8_downcvt_maybe;
3169 DEBUG(D_transport) if (!sx->utf8_needed)
3170 debug_printf("utf8: %s downconvert\n",
3171 sx->addrlist->prop.utf8_downcvt ? "mandatory" : "optional");
3174 /* If this is an international message we need the host to speak SMTPUTF8 */
3175 if (sx->utf8_needed && !(sx->peer_offered & OPTION_UTF8))
3177 errno = ERRNO_UTF8_FWD;
3178 goto RESPONSE_FAILED;
3180 #endif /*SUPPORT_I18N*/
3189 if (errno == ECONNREFUSED) /* first-read error on a TFO conn */
3191 /* There is a testing facility for simulating a connection timeout, as I
3192 can't think of any other way of doing this. It converts a connection
3193 refused into a timeout if the timeout is set to 999999. This is done for
3194 a 3whs connection in ip_connect(), but a TFO connection does not error
3195 there - instead it gets ECONNREFUSED on the first data read. Tracking
3196 that a TFO really was done is too hard, or we would set a
3197 sx->pending_conn_done bit and test that in smtp_reap_banner() and
3198 smtp_reap_ehlo(). That would let us also add the conn-timeout to the
3201 if (f.running_in_test_harness && ob->connect_timeout == 999999)
3203 set_errno_nohost(sx->addrlist,
3204 errno == ETIMEDOUT ? ERRNO_CONNECTTIMEOUT : errno,
3205 sx->verify ? US strerror(errno) : NULL,
3206 DEFER, FALSE, &sx->delivery_start);
3207 sx->send_quit = FALSE;
3211 /* really an error on an SMTP read */
3213 sx->send_quit = check_response(sx->conn_args.host, &errno, sx->addrlist->more_errno,
3214 sx->buffer, &code, &message, &pass_message);
3220 message = US string_sprintf("smtp send to %s [%s] failed: %s",
3221 sx->conn_args.host->name, sx->conn_args.host->address, strerror(errno));
3222 sx->send_quit = FALSE;
3228 message = string_sprintf("Remote host closed connection in response to %s"
3229 " (EHLO response was: %s)", smtp_command, sx->buffer);
3230 sx->send_quit = FALSE;
3234 /* This label is jumped to directly when a TLS negotiation has failed,
3235 or was not done for a host for which it is required. Values will be set
3236 in message and errno, and setting_up will always be true. Treat as
3237 a temporary error. */
3241 code = '4', yield = DEFER;
3245 /* The failure happened while setting up the call; see if the failure was
3246 a 5xx response (this will either be on connection, or following HELO - a 5xx
3247 after EHLO causes it to try HELO). If so, and there are no more hosts to try,
3248 fail all addresses, as this host is never going to accept them. For other
3249 errors during setting up (timeouts or whatever), defer all addresses, and
3250 yield DEFER, so that the host is not tried again for a while.
3252 XXX This peeking for another host feels like a layering violation. We want
3253 to note the host as unusable, but down here we shouldn't know if this was
3254 the last host to try for the addr(list). Perhaps the upper layer should be
3255 the one to do set_errno() ? The problem is that currently the addr is where
3256 errno etc. are stashed, but until we run out of hosts to try the errors are
3257 host-specific. Maybe we should enhance the host_item definition? */
3260 sx->ok = FALSE; /* For when reached by GOTO */
3261 set_errno(sx->addrlist, errno, message,
3262 sx->conn_args.host->next
3266 || errno == ERRNO_UTF8_FWD
3270 errno == ECONNREFUSED ? NULL : sx->conn_args.host,
3271 #ifdef EXPERIMENTAL_DSN_INFO
3272 sx->smtp_greeting, sx->helo_response,
3274 &sx->delivery_start);
3281 (void)smtp_write_command(sx, SCMD_FLUSH, "QUIT\r\n");
3284 if (sx->cctx.tls_ctx)
3286 if (sx->send_tlsclose)
3288 tls_close(sx->cctx.tls_ctx, TLS_SHUTDOWN_NOWAIT);
3289 sx->send_tlsclose = FALSE;
3291 sx->cctx.tls_ctx = NULL;
3295 /* Close the socket, and return the appropriate value, first setting
3296 works because the NULL setting is passed back to the calling process, and
3297 remote_max_parallel is forced to 1 when delivering over an existing connection,
3300 HDEBUG(D_transport|D_acl|D_v) debug_printf_indent(" SMTP(close)>>\n");
3303 shutdown(sx->cctx.sock, SHUT_WR);
3304 if (fcntl(sx->cctx.sock, F_SETFL, O_NONBLOCK) == 0)
3305 for (int i = 16; read(sx->cctx.sock, sx->inbuffer, sizeof(sx->inbuffer)) > 0 && i > 0;)
3306 i--; /* drain socket */
3307 sx->send_quit = FALSE;
3309 (void)close(sx->cctx.sock);
3312 #ifndef DISABLE_EVENT
3313 (void) event_raise(sx->conn_args.tblock->event_action, US"tcp:close", NULL, NULL);
3316 continue_transport = NULL;
3317 continue_hostname = NULL;
3324 /* Create the string of options that will be appended to the MAIL FROM:
3325 in the connection context buffer */
3328 build_mailcmd_options(smtp_context * sx, address_item * addrlist)
3330 uschar * p = sx->buffer;
3331 address_item * addr;
3336 /* If we know the receiving MTA supports the SIZE qualification, and we know it,
3337 send it, adding something to the message size to allow for imprecision
3338 and things that get added en route. Exim keeps the number of lines
3339 in a message, so we can give an accurate value for the original message, but we
3340 need some additional to handle added headers. (Double "." characters don't get
3341 included in the count.) */
3343 if ( message_size > 0
3344 && sx->peer_offered & OPTION_SIZE && !(sx->avoid_option & OPTION_SIZE))
3346 /*XXX problem here under spool_files_wireformat?
3347 Or just forget about lines? Or inflate by a fixed proportion? */
3349 sprintf(CS p, " SIZE=%d", message_size+message_linecount+(SOB sx->conn_args.ob)->size_addition);
3353 #ifndef DISABLE_PRDR
3354 /* If it supports Per-Recipient Data Responses, and we have more than one recipient,
3357 sx->prdr_active = FALSE;
3358 if (smtp_peer_options & OPTION_PRDR)
3359 for (address_item * addr = addrlist; addr; addr = addr->next)
3360 if (addr->transport_return == PENDING_DEFER)
3362 for (addr = addr->next; addr; addr = addr->next)
3363 if (addr->transport_return == PENDING_DEFER)
3364 { /* at least two recipients to send */
3365 sx->prdr_active = TRUE;
3366 sprintf(CS p, " PRDR"); p += 5;
3374 /* If it supports internationalised messages, and this meesage need that,
3377 if ( sx->peer_offered & OPTION_UTF8
3378 && addrlist->prop.utf8_msg
3379 && !addrlist->prop.utf8_downcvt
3381 Ustrcpy(p, US" SMTPUTF8"), p += 9;
3384 /* check if all addresses have DSN-lasthop flag; do not send RET and ENVID if so */
3385 for (sx->dsn_all_lasthop = TRUE, addr = addrlist, address_count = 0;
3386 addr && address_count < sx->max_rcpt; /*XXX maybe also || sx->single_rcpt_domain ? */
3387 addr = addr->next) if (addr->transport_return == PENDING_DEFER)
3390 if (!(addr->dsn_flags & rf_dsnlasthop))
3392 sx->dsn_all_lasthop = FALSE;
3397 /* Add any DSN flags to the mail command */
3399 if (sx->peer_offered & OPTION_DSN && !sx->dsn_all_lasthop)
3401 if (dsn_ret == dsn_ret_hdrs)
3402 { Ustrcpy(p, US" RET=HDRS"); p += 9; }
3403 else if (dsn_ret == dsn_ret_full)
3404 { Ustrcpy(p, US" RET=FULL"); p += 9; }
3408 string_format(p, sizeof(sx->buffer) - (p-sx->buffer), " ENVID=%s", dsn_envid);
3413 /* If an authenticated_sender override has been specified for this transport
3414 instance, expand it. If the expansion is forced to fail, and there was already
3415 an authenticated_sender for this message, the original value will be used.
3416 Other expansion failures are serious. An empty result is ignored, but there is
3417 otherwise no check - this feature is expected to be used with LMTP and other
3418 cases where non-standard addresses (e.g. without domains) might be required. */
3420 return smtp_mail_auth_str(sx, p, addrlist) ? ERROR : OK;
3425 build_rcptcmd_options(smtp_context * sx, const address_item * addr)
3427 uschar * p = sx->buffer;
3430 /* Add any DSN flags to the rcpt command */
3432 if (sx->peer_offered & OPTION_DSN && !(addr->dsn_flags & rf_dsnlasthop))
3434 if (addr->dsn_flags & rf_dsnflags)
3438 Ustrcpy(p, US" NOTIFY=");
3440 for (int i = 0; i < nelem(rf_list); i++) if (addr->dsn_flags & rf_list[i])
3442 if (!first) *p++ = ',';
3444 Ustrcpy(p, rf_names[i]);
3449 if (addr->dsn_orcpt)
3451 string_format(p, sizeof(sx->buffer) - (p-sx->buffer), " ORCPT=%s",
3460 /* Send MAIL FROM and RCPT TO commands.
3461 See sw_mrc_t definition for return codes.
3465 smtp_write_mail_and_rcpt_cmds(smtp_context * sx, int * yield)
3467 address_item * addr;
3468 #ifndef DISABLE_ESMTP_LIMITS
3469 address_item * restart_addr = NULL;
3471 int address_count, pipe_limit;
3474 if (build_mailcmd_options(sx, sx->first_addr) != OK)
3477 return sw_mrc_bad_internal;
3480 /* From here until we send the DATA command, we can make use of PIPELINING
3481 if the server host supports it. The code has to be able to check the responses
3482 at any point, for when the buffer fills up, so we write it totally generally.
3483 When PIPELINING is off, each command written reports that it has flushed the
3486 sx->pending_MAIL = TRUE; /* The block starts with MAIL */
3489 const uschar * s = sx->from_addr;
3491 uschar * errstr = NULL;
3493 /* If we must downconvert, do the from-address here. Remember we had to
3494 for the to-addresses (done below), and also (ugly) for re-doing when building
3495 the delivery log line. */
3497 if ( sx->addrlist->prop.utf8_msg
3498 && (sx->addrlist->prop.utf8_downcvt || !(sx->peer_offered & OPTION_UTF8))
3501 if (s = string_address_utf8_to_alabel(s, &errstr), errstr)
3503 set_errno_nohost(sx->addrlist, ERRNO_EXPANDFAIL, errstr, DEFER, FALSE, &sx->delivery_start);
3505 return sw_mrc_bad_internal;
3507 setflag(sx->addrlist, af_utf8_downcvt);
3511 rc = smtp_write_command(sx, pipelining_active ? SCMD_BUFFER : SCMD_FLUSH,
3512 "MAIL FROM:<%s>%s\r\n", s, sx->buffer);
3515 mail_command = string_copy(big_buffer); /* Save for later error message */
3519 case -1: /* Transmission error */
3520 return sw_mrc_bad_mail;
3522 case +1: /* Cmd was sent */
3523 if (!smtp_read_response(sx, sx->buffer, sizeof(sx->buffer), '2',
3524 (SOB sx->conn_args.ob)->command_timeout))
3526 if (errno == 0 && sx->buffer[0] == '4')
3528 errno = ERRNO_MAIL4XX;
3529 sx->addrlist->more_errno |= ((sx->buffer[1] - '0')*10 + sx->buffer[2] - '0') << 8;
3531 return sw_mrc_bad_mail;
3533 sx->pending_MAIL = FALSE;
3536 /* otherwise zero: command queued for pipeline */
3539 /* Pass over all the relevant recipient addresses for this host, which are the
3540 ones that have status PENDING_DEFER. If we are using PIPELINING, we can send
3541 several before we have to read the responses for those seen so far. This
3542 checking is done by a subroutine because it also needs to be done at the end.
3543 Send only up to max_rcpt addresses at a time, leaving next_addr pointing to
3544 the next one if not all are sent.
3546 In the MUA wrapper situation, we want to flush the PIPELINING buffer for the
3547 last address because we want to abort if any recipients have any kind of
3548 problem, temporary or permanent. We know that all recipient addresses will have
3549 the PENDING_DEFER status, because only one attempt is ever made, and we know
3550 that max_rcpt will be large, so all addresses will be done at once.
3552 For verify we flush the pipeline after any (the only) rcpt address. */
3554 for (addr = sx->first_addr, address_count = 0, pipe_limit = 100;
3555 addr && address_count < sx->max_rcpt;
3556 addr = addr->next) if (addr->transport_return == PENDING_DEFER)
3560 const uschar * rcpt_addr;
3562 #ifndef DISABLE_ESMTP_LIMITS
3563 if ( sx->single_rcpt_domain /* restriction on domains */
3564 && address_count > 0 /* not first being sent */
3565 && Ustrcmp(addr->domain, sx->first_addr->domain) != 0 /* dom diff from first */
3568 DEBUG(D_transport) debug_printf("skipping different domain %s\n", addr->domain);
3570 /* Ensure the smtp-response reaper does not think the address had a RCPT
3571 command sent for it. Reset to PENDING_DEFER in smtp_deliver(), where we
3572 goto SEND_MESSAGE. */
3574 addr->transport_return = SKIP;
3575 if (!restart_addr) restart_addr = addr; /* note restart point */
3576 continue; /* skip this one */
3580 addr->dsn_aware = sx->peer_offered & OPTION_DSN
3581 ? dsn_support_yes : dsn_support_no;
3584 if (pipe_limit-- <= 0)
3585 { no_flush = FALSE; pipe_limit = 100; }
3587 no_flush = pipelining_active && !sx->verify
3588 && (!mua_wrapper || addr->next && address_count < sx->max_rcpt);
3590 build_rcptcmd_options(sx, addr);
3592 /* Now send the RCPT command, and process outstanding responses when
3593 necessary. After a timeout on RCPT, we just end the function, leaving the
3594 yield as OK, because this error can often mean that there is a problem with
3595 just one address, so we don't want to delay the host. */
3597 rcpt_addr = transport_rcpt_address(addr, sx->conn_args.tblock->rcpt_include_affixes);
3600 if ( testflag(sx->addrlist, af_utf8_downcvt)
3601 && !(rcpt_addr = string_address_utf8_to_alabel(rcpt_addr, NULL))
3604 /*XXX could we use a per-address errstr here? Not fail the whole send? */
3605 errno = ERRNO_EXPANDFAIL;
3606 return sw_mrc_tx_fail; /*XXX too harsh? */
3610 cmds_sent = smtp_write_command(sx, no_flush ? SCMD_BUFFER : SCMD_FLUSH,
3611 "RCPT TO:<%s>%s%s\r\n", rcpt_addr, sx->igquotstr, sx->buffer);
3613 if (cmds_sent < 0) return sw_mrc_tx_fail;
3616 switch(sync_responses(sx, cmds_sent, 0))
3618 case RESP_HAD_2_AND_5: sx->ok = TRUE; /* OK & progress made */
3619 case RESP_BIT_HAD_5XX: sx->completed_addr = TRUE; /* progress made */
3622 case RESP_BIT_HAD_2XX: sx->ok = TRUE; /* OK, but if LMTP, */
3623 if (!sx->lmtp) /* can't tell about progress yet */
3624 sx->completed_addr = TRUE;
3625 case RESP_NOERROR: /* No 2xx or 5xx, but no probs */
3626 /* If any RCPT got a 452 response then next_addr has been updated
3627 for restarting with a new MAIL on the same connection. Send no more
3628 RCPTs for this MAIL. */
3632 DEBUG(D_transport) debug_printf("seen 452 too-many-rcpts\n");
3633 sx->RCPT_452 = FALSE;
3634 /* sx->next_addr has been reset for fast_retry */
3639 case RESP_RCPT_TIMEO: return sw_mrc_nonmail_read_timeo;
3640 case RESP_RCPT_ERROR: return sw_mrc_bad_read;
3641 default: return sw_mrc_bad_mail; /* any MAIL error */
3643 #ifndef DISABLE_PIPE_CONNECT
3644 case RESP_EPIPE_EHLO_ERR: return sw_mrc_bad_mail; /* non-2xx for pipelined banner or EHLO */
3645 case RESP_EHLO_ERR_TLS: return sw_mrc_bad_mail; /* TLS first-read error */
3649 } /* Loop for next address */
3651 #ifndef DISABLE_ESMTP_LIMITS
3652 sx->next_addr = restart_addr ? restart_addr : addr;
3654 sx->next_addr = addr;
3661 /*****************************************************
3662 * Proxy TLS connection for another transport process *
3663 ******************************************************/
3665 Close the unused end of the pipe, fork once more, then use the given buffer
3666 as a staging area, and select on both the given fd and the TLS'd client-fd for
3667 data to read (per the coding in ip_recv() and fd_ready() this is legitimate).
3668 Do blocking full-size writes, and reads under a timeout. Once both input
3669 channels are closed, exit the process.
3673 buf space to use for buffering
3674 bufsiz size of buffer
3675 pfd pipe filedescriptor array; [0] is comms to proxied process
3676 timeout per-read timeout, seconds
3677 host hostname of remote
3683 smtp_proxy_tls(void * ct_ctx, uschar * buf, size_t bsize, int * pfd,
3684 int timeout, const uschar * host)
3686 struct pollfd p[2] = {{.fd = tls_out.active.sock, .events = POLLIN},
3687 {.fd = pfd[0], .events = POLLIN}};
3689 BOOL send_tls_shutdown = TRUE;
3693 if ((rc = exim_fork(US"tls-proxy")))
3694 _exit(rc < 0 ? EXIT_FAILURE : EXIT_SUCCESS);
3696 set_process_info("proxying TLS connection for continued transport to %s\n", host);
3700 time_t time_left = timeout;
3701 time_t time_start = time(NULL);
3706 rc = poll(p, 2, time_left * 1000);
3708 if (rc < 0 && errno == EINTR)
3709 if ((time_left -= time(NULL) - time_start) > 0) continue;
3713 DEBUG(D_transport) if (rc == 0) debug_printf("%s: timed out\n", __FUNCTION__);
3717 /* For errors where not readable, bomb out */
3719 if (p[0].revents & POLLERR || p[1].revents & POLLERR)
3721 DEBUG(D_transport) debug_printf("select: exceptional cond on %s fd\n",
3722 p[0].revents & POLLERR ? "tls" : "proxy");
3723 if (!(p[0].revents & POLLIN || p[1].events & POLLIN))
3725 DEBUG(D_transport) debug_printf("- but also readable; no exit yet\n");
3728 while (rc < 0 || !(p[0].revents & POLLIN || p[1].revents & POLLIN));
3730 /* handle inbound data */
3731 if (p[0].revents & POLLIN)
3732 if ((rc = tls_read(ct_ctx, buf, bsize)) <= 0) /* Expect -1 for EOF; */
3733 { /* that reaps the TLS Close Notify record */
3735 shutdown(pfd[0], SHUT_WR);
3739 for (int nbytes = 0; rc - nbytes > 0; nbytes += i)
3740 if ((i = write(pfd[0], buf + nbytes, rc - nbytes)) < 0) goto done;
3742 /* Handle outbound data. We cannot yet combine payload and the TLS-close
3743 due to the limitations of the (pipe) channel feeding us. Could we use
3744 a poll/POLLRDHUP? Would that need an extra poll call after every read
3745 (likely not worth it), or (best case) could we get POLLIN+POLLRDHUP for
3746 the final data blob? */
3748 if (p[1].revents & POLLIN)
3749 if ((rc = read(pfd[0], buf, bsize)) <= 0)
3753 # ifdef EXIM_TCP_CORK /* Use _CORK to get TLS Close Notify in FIN segment */
3754 (void) setsockopt(tls_out.active.sock, IPPROTO_TCP, EXIM_TCP_CORK, US &on, sizeof(on));
3756 tls_shutdown_wr(ct_ctx);
3757 send_tls_shutdown = FALSE;
3758 shutdown(tls_out.active.sock, SHUT_WR);
3761 for (int nbytes = 0; rc - nbytes > 0; nbytes += i)
3762 if ((i = tls_write(ct_ctx, buf + nbytes, rc - nbytes, FALSE)) < 0)
3765 while (p[0].fd >= 0 || p[1].fd >= 0);
3768 if (send_tls_shutdown) tls_close(ct_ctx, TLS_SHUTDOWN_NOWAIT);
3770 testharness_pause_ms(100); /* let logging complete */
3771 exim_exit(EXIT_SUCCESS);
3776 /*************************************************
3777 * Deliver address list to given host *
3778 *************************************************/
3780 /* If continue_hostname is not null, we get here only when continuing to
3781 deliver down an existing channel. The channel was passed as the standard
3782 input. TLS is never active on a passed channel; the previous process either
3783 closes it down before passing the connection on, or inserts a TLS-proxy
3784 process and passes on a cleartext conection.
3786 Otherwise, we have to make a connection to the remote host, and do the
3787 initial protocol exchange.
3789 When running as an MUA wrapper, if the sender or any recipient is rejected,
3790 temporarily or permanently, we force failure for all recipients.
3793 addrlist chain of potential addresses to deliver; only those whose
3794 transport_return field is set to PENDING_DEFER are currently
3795 being processed; others should be skipped - they have either
3796 been delivered to an earlier host or IP address, or been
3797 failed by one of them.
3798 host host to deliver to
3799 host_af AF_INET or AF_INET6
3800 defport default TCP/IP port to use if host does not specify, in host
3802 interface interface to bind to, or NULL
3803 tblock transport instance block
3804 message_defer set TRUE if yield is OK, but all addresses were deferred
3805 because of a non-recipient, non-host failure, that is, a
3806 4xx response to MAIL FROM, DATA, or ".". This is a defer
3807 that is specific to the message.
3808 suppress_tls if TRUE, don't attempt a TLS connection - this is set for
3809 a second attempt after TLS initialization fails
3811 Returns: OK - the connection was made and the delivery attempted;
3812 the result for each address is in its data block.
3813 DEFER - the connection could not be made, or something failed
3814 while setting up the SMTP session, or there was a
3815 non-message-specific error, such as a timeout.
3816 ERROR - a filter command is specified for this transport,
3817 and there was a problem setting it up; OR helo_data
3818 or add_headers or authenticated_sender is specified
3819 for this transport, and the string failed to expand
3821 For all non-OK returns the first addr of the list carries the
3822 time taken for the attempt.
3826 smtp_deliver(address_item *addrlist, host_item *host, int host_af, int defport,
3827 uschar *interface, transport_instance *tblock,
3828 BOOL *message_defer, BOOL suppress_tls)
3830 smtp_transport_options_block * ob = tblock->drinst.options_block;
3831 const uschar * trname = tblock->drinst.name;
3836 uschar *message = NULL;
3837 smtp_context * sx = store_get(sizeof(*sx), GET_TAINTED); /* tainted, for the data buffers */
3838 BOOL pass_message = FALSE;
3839 #ifndef DISABLE_ESMTP_LIMITS
3840 BOOL mail_limit = FALSE;
3845 BOOL tcw_done = FALSE, tcw = FALSE, passback_conn = FALSE;
3847 *message_defer = FALSE;
3848 continue_next_id[0] = '\0';
3850 memset(sx, 0, sizeof(*sx));
3851 sx->addrlist = addrlist;
3852 sx->conn_args.host = host;
3853 sx->conn_args.host_af = host_af;
3855 sx->conn_args.interface = interface;
3856 sx->helo_data = NULL;
3857 sx->conn_args.tblock = tblock;
3858 sx->conn_args.sock = -1;
3859 gettimeofday(&sx->delivery_start, NULL);
3860 sx->sync_addr = sx->first_addr = addrlist;
3867 /* Get the channel set up ready for a message, MAIL FROM being the next
3868 SMTP command to send. */
3870 if ((rc = smtp_setup_conn(sx, suppress_tls)) != OK)
3872 timesince(&addrlist->delivery_time, &sx->delivery_start);
3878 /* If the connection used DANE, ignore for now any addresses with incompatible
3879 domains. The SNI has to be the domain. Arrange a whole new TCP conn later,
3880 just in case only TLS isn't enough. */
3882 if (sx->conn_args.dane)
3884 const uschar * dane_domain = sx->first_addr->domain;
3886 for (address_item * a = sx->first_addr->next; a; a = a->next)
3887 if ( a->transport_return == PENDING_DEFER
3888 && Ustrcmp(dane_domain, a->domain) != 0)
3890 DEBUG(D_transport) debug_printf("DANE: holding %s for later\n", a->domain);
3892 a->transport_return = DANE;
3897 /* If there is a filter command specified for this transport, we can now
3898 set it up. This cannot be done until the identity of the host is known. */
3900 if (tblock->filter_command)
3902 transport_filter_timeout = tblock->filter_timeout;
3904 /* On failure, copy the error to all addresses, abandon the SMTP call, and
3907 if (!transport_set_up_command(&transport_filter_argv,
3908 tblock->filter_command, TSUC_EXPAND_ARGS, DEFER, addrlist,
3909 string_sprintf("%.50s transport filter", trname), NULL))
3911 set_errno_nohost(addrlist->next, addrlist->basic_errno, addrlist->message, DEFER,
3912 FALSE, &sx->delivery_start);
3917 if ( transport_filter_argv
3918 && *transport_filter_argv
3919 && **transport_filter_argv
3920 && smtp_peer_options & OPTION_CHUNKING
3921 #ifndef DISABLE_DKIM
3922 /* When dkim signing, chunking is handled even with a transport-filter */
3923 && !(ob->dkim.dkim_private_key && ob->dkim.dkim_domain && ob->dkim.dkim_selector)
3924 && !ob->dkim.force_bodyhash
3928 smtp_peer_options &= ~OPTION_CHUNKING;
3929 DEBUG(D_transport) debug_printf("CHUNKING not usable due to transport filter\n");
3933 /* For messages that have more than the maximum number of envelope recipients,
3934 we want to send several transactions down the same SMTP connection. (See
3935 comments in deliver.c as to how this reconciles, heuristically, with
3936 remote_max_parallel.) This optimization was added to Exim after the following
3937 code was already working. The simplest way to put it in without disturbing the
3938 code was to use a goto to jump back to this point when there is another
3939 transaction to handle. */
3942 sx->from_addr = return_path;
3943 sx->sync_addr = sx->first_addr;
3945 sx->send_rset = TRUE;
3946 sx->completed_addr = FALSE;
3949 /* If we are a continued-connection-after-verify the MAIL and RCPT
3950 commands were already sent; do not re-send but do mark the addrs as
3951 having been accepted up to RCPT stage. A traditional cont-conn
3952 always has a sequence number greater than one. */
3954 if (continue_hostname && continue_sequence == 1)
3956 /* sx->pending_MAIL = FALSE; */
3958 /* sx->next_addr = NULL; */
3960 for (address_item * addr = addrlist; addr; addr = addr->next)
3961 addr->transport_return = PENDING_OK;
3965 /* Initiate a message transfer. */
3967 switch(smtp_write_mail_and_rcpt_cmds(sx, &yield))
3969 case sw_mrc_ok: break;
3970 case sw_mrc_bad_mail: goto RESPONSE_FAILED;
3971 case sw_mrc_bad_read: goto RESPONSE_FAILED;
3972 case sw_mrc_nonmail_read_timeo: goto END_OFF;
3973 case sw_mrc_bad_internal: goto SEND_QUIT;
3974 default: goto SEND_FAILED;
3977 /* If we are an MUA wrapper, abort if any RCPTs were rejected, either
3978 permanently or temporarily. We should have flushed and synced after the last
3986 for (a = sx->first_addr, cnt = 0; a && cnt < sx->max_rcpt; a = a->next, cnt++)
3987 if (a->transport_return != PENDING_OK)
3989 /*XXX could we find a better errno than 0 here? */
3990 set_errno_nohost(addrlist, 0, a->message, FAIL,
3991 testflag(a, af_pass_message), &sx->delivery_start);
3998 /* If ok is TRUE, we know we have got at least one good recipient, and must now
3999 send DATA, but if it is FALSE (in the normal, non-wrapper case), we may still
4000 have a good recipient buffered up if we are pipelining. We don't want to waste
4001 time sending DATA needlessly, so we only send it if either ok is TRUE or if we
4002 are pipelining. The responses are all handled by sync_responses().
4003 If using CHUNKING, do not send a BDAT until we know how big a chunk we want
4006 if ( !(smtp_peer_options & OPTION_CHUNKING)
4007 && (sx->ok || (pipelining_active && !mua_wrapper)))
4009 int count = smtp_write_command(sx, SCMD_FLUSH, "DATA\r\n");
4011 if (count < 0) goto SEND_FAILED;
4013 switch(sync_responses(sx, count, sx->ok ? +1 : -1))
4015 case RESP_HAD_2_AND_5: sx->ok = TRUE; /* OK & progress made */
4016 case RESP_BIT_HAD_5XX: sx->completed_addr = TRUE; /* progress made */
4019 case RESP_BIT_HAD_2XX: sx->ok = TRUE; /* OK, but if LMTP, */
4020 if (!sx->lmtp) /* can't tell about progress yet */
4021 sx->completed_addr = TRUE;
4022 case RESP_NOERROR: break; /* No 2xx or 5xx, but no probs */
4024 case RESP_RCPT_TIMEO: goto END_OFF;
4026 #ifndef DISABLE_PIPE_CONNECT
4027 case -5: /* TLS first-read error */
4028 case -4: HDEBUG(D_transport)
4029 debug_printf("failed reaping pipelined cmd responses\n");
4031 default: goto RESPONSE_FAILED; /* I/O error, or any MAIL/DATA error */
4033 pipelining_active = FALSE;
4034 data_command = string_copy(big_buffer); /* Save for later error message */
4037 /* If there were no good recipients (but otherwise there have been no
4038 problems), just set ok TRUE, since we have handled address-specific errors
4039 already. Otherwise, it's OK to send the message. Use the check/escape mechanism
4040 for handling the SMTP dot-handling protocol, flagging to apply to headers as
4041 well as body. Set the appropriate timeout value to be used for each chunk.
4042 (Haven't been able to make it work using select() for writing yet.) */
4045 && (!(smtp_peer_options & OPTION_CHUNKING) || !pipelining_active))
4047 /* Save the first address of the next batch. */
4048 sx->first_addr = sx->next_addr;
4054 transport_ctx tctx = {
4055 .u = {.fd = sx->cctx.sock}, /*XXX will this need TLS info? */
4058 .check_string = US".",
4059 .escape_string = US"..", /* Escaping strings */
4061 topt_use_crlf | topt_escape_headers
4062 | (tblock->body_only ? topt_no_headers : 0)
4063 | (tblock->headers_only ? topt_no_body : 0)
4064 | (tblock->return_path_add ? topt_add_return_path : 0)
4065 | (tblock->delivery_date_add ? topt_add_delivery_date : 0)
4066 | (tblock->envelope_to_add ? topt_add_envelope_to : 0)
4069 /* If using CHUNKING we need a callback from the generic transport
4070 support to us, for the sending of BDAT smtp commands and the reaping
4071 of responses. The callback needs a whole bunch of state so set up
4072 a transport-context structure to be passed around. */
4074 if (smtp_peer_options & OPTION_CHUNKING)
4076 tctx.check_string = tctx.escape_string = NULL;
4077 tctx.options |= topt_use_bdat;
4078 tctx.chunk_cb = smtp_chunk_cmd_callback;
4079 sx->pending_BDAT = FALSE;
4080 sx->good_RCPT = sx->ok;
4082 tctx.smtp_context = sx;
4085 tctx.options |= topt_end_dot;
4087 /* Save the first address of the next batch. */
4088 sx->first_addr = sx->next_addr;
4090 /* Responses from CHUNKING commands go in buffer. Otherwise,
4091 there has not been a response. */
4095 sigalrm_seen = FALSE;
4096 transport_write_timeout = ob->data_timeout;
4097 smtp_command = US"sending data block"; /* For error messages */
4098 DEBUG(D_transport|D_v)
4099 if (smtp_peer_options & OPTION_CHUNKING)
4100 debug_printf(" will write message using CHUNKING\n");
4102 debug_printf(" SMTP>> (writing message)\n");
4103 transport_count = 0;
4105 #ifndef DISABLE_DKIM
4107 typedef void (*fn_t)(void);
4108 misc_module_info * mi;
4109 # ifdef MEASURE_TIMING
4111 gettimeofday(&t0, NULL);
4114 if ((mi = misc_mod_find(US"dkim", NULL)))
4116 (((fn_t *) mi->functions)[DKIM_TRANSPORT_INIT]) ();
4118 # ifdef EXPERIMENTAL_ARC
4119 uschar * s = ob->arc_sign;
4122 if (!(ob->dkim.arc_signspec = s = expand_string(s)))
4124 if (!f.expand_string_forcedfail)
4126 message = US"failed to expand arc_sign";
4133 /* Ask dkim code to hash the body for ARC */
4134 (void) arc_ams_setup_sign_bodyhash();
4135 ob->dkim.force_bodyhash = TRUE;
4140 # ifdef MEASURE_TIMING
4141 report_time_since(&t0, US"dkim_exim_sign_init (delta)");
4146 /* See if we can pipeline QUIT. Reasons not to are
4147 - pipelining not active
4148 - not ok to send quit
4149 - errors in amtp transation responses
4150 - more addrs to send for this message or this host
4151 - this message was being retried
4152 - more messages for this host
4153 If we can, we want the message-write to not flush (the tail end of) its data out. */
4155 if ( sx->pipelining_used
4156 && (sx->ok && sx->completed_addr || smtp_peer_options & OPTION_CHUNKING)
4158 && !(sx->first_addr || f.continue_more)
4159 && f.deliver_firsttime
4162 smtp_compare_t t_compare =
4163 {.tblock = tblock, .current_sender_address = sender_address};
4168 ( tls_out.active.sock < 0 && !continue_proxy_cipher
4169 || verify_check_given_host(CUSS &ob->hosts_nopass_tls, host) != OK
4173 transport_check_waiting(trname, host->name,
4174 tblock->connection_max_messages, continue_next_id,
4175 (oicf)smtp_are_same_identities, (void*)&t_compare);
4178 HDEBUG(D_transport) debug_printf("will pipeline QUIT\n");
4179 tctx.options |= topt_no_flush;
4183 #ifndef DISABLE_DKIM
4185 misc_module_info * mi = misc_mod_find(US"dkim", NULL);
4186 typedef BOOL (*fn_t)(transport_ctx *, struct ob_dkim *, const uschar **);
4189 ? (((fn_t *) mi->functions)[DKIM_TRANSPORT_WRITE])
4190 (&tctx, &ob->dkim, CUSS &message)
4191 : transport_write_message(&tctx, 0);
4194 sx->ok = transport_write_message(&tctx, 0);
4197 /* transport_write_message() uses write() because it is called from other
4198 places to write to non-sockets. This means that under some OS (e.g. Solaris)
4199 it can exit with "Broken pipe" as its error. This really means that the
4200 socket got closed at the far end. */
4202 transport_write_timeout = 0; /* for subsequent transports */
4204 /* Failure can either be some kind of I/O disaster (including timeout),
4205 or the failure of a transport filter or the expansion of added headers.
4206 Or, when CHUNKING, it can be a protocol-detected failure. */
4209 if (message) goto SEND_FAILED;
4210 else goto RESPONSE_FAILED;
4212 /* We used to send the terminating "." explicitly here, but because of
4213 buffering effects at both ends of TCP/IP connections, you don't gain
4214 anything by keeping it separate, so it might as well go in the final
4215 data buffer for efficiency. This is now done by setting the topt_end_dot
4218 smtp_command = US"end of data";
4220 /* If we can pipeline a QUIT with the data them send it now. If a new message
4221 for this host appeared in the queue while data was being sent, we will not see
4222 it and it will have to wait for a queue run. If there was one but another
4223 thread took it, we might attempt to send it - but locking of spoolfiles will
4224 detect that. Use _MORE to get QUIT in FIN segment. */
4226 if (tcw_done && !tcw)
4228 /*XXX jgh 2021/03/10 google et. al screwup. G, at least, sends TCP FIN in response to TLS
4229 close-notify. Under TLS 1.3, violating RFC.
4230 However, TLS 1.2 does not have half-close semantics. */
4232 if ( sx->cctx.tls_ctx
4233 #if 0 && !defined(DISABLE_TLS)
4234 && Ustrcmp(tls_out.ver, "TLS1.3") != 0
4236 || !f.deliver_firsttime
4238 { /* Send QUIT now and not later */
4239 (void)smtp_write_command(sx, SCMD_FLUSH, "QUIT\r\n");
4240 sx->send_quit = FALSE;
4243 { /* add QUIT to the output buffer */
4244 (void)smtp_write_command(sx, SCMD_MORE, "QUIT\r\n");
4245 sx->send_quit = FALSE; /* avoid sending it later */
4248 if (sx->cctx.tls_ctx && sx->send_tlsclose) /* need to send TLS Close Notify */
4250 # ifdef EXIM_TCP_CORK /* Use _CORK to get Close Notify in FIN segment */
4251 (void) setsockopt(sx->cctx.sock, IPPROTO_TCP, EXIM_TCP_CORK, US &on, sizeof(on));
4253 tls_shutdown_wr(sx->cctx.tls_ctx);
4254 sx->send_tlsclose = FALSE; /* avoid later repeat */
4257 HDEBUG(D_transport|D_acl|D_v) debug_printf_indent(" SMTP(shutdown)>>\n");
4258 shutdown(sx->cctx.sock, SHUT_WR); /* flush output buffer, with TCP FIN */
4262 if (smtp_peer_options & OPTION_CHUNKING && sx->cmd_count > 1)
4264 /* Reap any outstanding MAIL & RCPT commands, but not a DATA-go-ahead */
4265 switch(sync_responses(sx, sx->cmd_count-1, 0))
4267 case RESP_HAD_2_AND_5: sx->ok = TRUE; /* OK & progress made */
4268 case RESP_BIT_HAD_5XX: sx->completed_addr = TRUE; /* progress made */
4271 case RESP_BIT_HAD_2XX: sx->ok = TRUE; /* OK, but if LMTP, */
4272 if (!sx->lmtp) /* can't tell about progress yet */
4273 sx->completed_addr = TRUE;
4274 case RESP_NOERROR: break; /* No 2xx or 5xx, but no probs */
4276 case RESP_RCPT_TIMEO: goto END_OFF; /* Timeout on RCPT */
4278 #ifndef DISABLE_PIPE_CONNECT
4279 case RESP_EHLO_ERR_TLS: /* TLS first-read error */
4280 case RESP_EPIPE_EHLO_ERR: HDEBUG(D_transport)
4281 debug_printf("failed reaping pipelined cmd responses\n");
4283 default: goto RESPONSE_FAILED; /* I/O error, or any MAIL/DATA error */
4287 #ifndef DISABLE_PRDR
4288 /* For PRDR we optionally get a partial-responses warning followed by the
4289 individual responses, before going on with the overall response. If we don't
4290 get the warning then deal with per non-PRDR. */
4294 sx->ok = smtp_read_response(sx, sx->buffer, sizeof(sx->buffer), '3', ob->final_timeout);
4295 if (!sx->ok && errno == 0) switch(sx->buffer[0])
4297 case '2': sx->prdr_active = FALSE;
4300 case '4': errno = ERRNO_DATA4XX;
4301 addrlist->more_errno |=
4302 ((sx->buffer[1] - '0')*10 + sx->buffer[2] - '0') << 8;
4309 /* For non-PRDR SMTP, we now read a single response that applies to the
4310 whole message. If it is OK, then all the addresses have been delivered. */
4314 sx->ok = smtp_read_response(sx, sx->buffer, sizeof(sx->buffer), '2',
4316 if (!sx->ok && errno == 0 && sx->buffer[0] == '4')
4318 errno = ERRNO_DATA4XX;
4319 addrlist->more_errno |= ((sx->buffer[1] - '0')*10 + sx->buffer[2] - '0') << 8;
4323 /* For LMTP, we get back a response for every RCPT command that we sent;
4324 some may be accepted and some rejected. For those that get a response, their
4325 status is fixed; any that are accepted have been handed over, even if later
4326 responses crash - at least, that's how I read RFC 2033.
4328 If all went well, mark the recipient addresses as completed, record which
4329 host/IPaddress they were delivered to, and cut out RSET when sending another
4330 message down the same channel. Write the completed addresses to the journal
4331 now so that they are recorded in case there is a crash of hardware or
4332 software before the spool gets updated. Also record the final SMTP
4333 confirmation if needed (for SMTP only). */
4338 struct timeval delivery_time;
4340 uschar * conf = NULL;
4342 timesince(&delivery_time, &sx->delivery_start);
4343 sx->send_rset = FALSE;
4344 pipelining_active = FALSE;
4346 /* Set up confirmation if needed - applies only to SMTP */
4349 #ifdef DISABLE_EVENT
4350 LOGGING(smtp_confirmation) &&
4355 const uschar * s = string_printing(sx->buffer);
4356 /* deconst cast ok here as string_printing was checked to have alloc'n'copied */
4357 conf = s == sx->buffer ? US string_copy(s) : US s;
4360 /* Process all transported addresses - for LMTP or PRDR, read a status for
4361 each one. We used to drop out at first_addr, until someone returned a 452
4362 followed by a 250... and we screwed up the accepted addresses. */
4364 for (address_item * addr = addrlist; addr; addr = addr->next)
4366 if (addr->transport_return != PENDING_OK) continue;
4368 /* LMTP - if the response fails badly (e.g. timeout), use it for all the
4369 remaining addresses. Otherwise, it's a return code for just the one
4370 address. For temporary errors, add a retry item for the address so that
4371 it doesn't get tried again too soon. */
4373 #ifndef DISABLE_PRDR
4374 if (sx->lmtp || sx->prdr_active)
4379 if (!smtp_read_response(sx, sx->buffer, sizeof(sx->buffer), '2',
4382 if (errno != 0 || sx->buffer[0] == 0) goto RESPONSE_FAILED;
4383 addr->message = string_sprintf(
4384 #ifndef DISABLE_PRDR
4385 "%s error after %s: %s", sx->prdr_active ? "PRDR":"LMTP",
4387 "LMTP error after %s: %s",
4389 data_command, string_printing(sx->buffer));
4390 setflag(addr, af_pass_message); /* Allow message to go to user */
4391 if (sx->buffer[0] == '5')
4392 addr->transport_return = FAIL;
4395 errno = ERRNO_DATA4XX;
4396 addr->more_errno |= ((sx->buffer[1] - '0')*10 + sx->buffer[2] - '0') << 8;
4397 addr->transport_return = DEFER;
4398 #ifndef DISABLE_PRDR
4399 if (!sx->prdr_active)
4401 retry_add_item(addr, addr->address_retry_key, 0);
4405 sx->completed_addr = TRUE; /* NOW we can set this flag */
4406 if (LOGGING(smtp_confirmation))
4408 const uschar *s = string_printing(sx->buffer);
4409 /* deconst cast ok here as string_printing was checked to have alloc'n'copied */
4410 conf = (s == sx->buffer) ? US string_copy(s) : US s;
4414 /* SMTP, or success return from LMTP for this address. Pass back the
4415 actual host that was used. */
4417 addr->transport_return = OK;
4418 addr->host_used = host;
4419 addr->delivery_time = delivery_time;
4420 addr->special_action = flag;
4421 addr->message = conf;
4422 if (continue_sequence > 1)
4423 { clearflag(addr, af_new_conn); setflag(addr, af_cont_conn); }
4425 { clearflag(addr, af_cont_conn); setflag(addr, af_new_conn); }
4427 if (tcp_out_fastopen)
4429 setflag(addr, af_tcp_fastopen_conn);
4430 if (tcp_out_fastopen >= TFO_USED_NODATA) setflag(addr, af_tcp_fastopen);
4431 if (tcp_out_fastopen >= TFO_USED_DATA) setflag(addr, af_tcp_fastopen_data);
4433 if (sx->pipelining_used) setflag(addr, af_pipelining);
4434 #ifndef DISABLE_PIPE_CONNECT
4435 if (sx->early_pipe_active) setflag(addr, af_early_pipe);
4437 #ifndef DISABLE_PRDR
4438 if (sx->prdr_active) setflag(addr, af_prdr_used);
4440 if (smtp_peer_options & OPTION_CHUNKING) setflag(addr, af_chunking_used);
4443 #ifndef DISABLE_PRDR
4444 if (!sx->prdr_active)
4447 /* Update the journal. For homonymic addresses, use the base address plus
4448 the transport name. See lots of comments in deliver.c about the reasons
4449 for the complications when homonyms are involved. Just carry on after
4450 write error, as it may prove possible to update the spool file later. */
4452 if (testflag(addr, af_homonym))
4453 sprintf(CS sx->buffer, "%.500s/%s\n", addr->unique + 3, trname);
4455 sprintf(CS sx->buffer, "%.500s\n", addr->unique);
4457 DEBUG(D_deliver) debug_printf("S:journalling %s", sx->buffer);
4458 len = Ustrlen(CS sx->buffer);
4459 if (write(journal_fd, sx->buffer, len) != len)
4460 log_write(0, LOG_MAIN|LOG_PANIC, "failed to write journal for "
4461 "%s: %s", sx->buffer, strerror(errno));
4465 #ifndef DISABLE_PRDR
4466 if (sx->prdr_active)
4468 const uschar * overall_message;
4470 /* PRDR - get the final, overall response. For any non-success
4471 upgrade all the address statuses. */
4473 sx->ok = smtp_read_response(sx, sx->buffer, sizeof(sx->buffer), '2',
4477 if(errno == 0 && sx->buffer[0] == '4')
4479 errno = ERRNO_DATA4XX;
4480 addrlist->more_errno |= ((sx->buffer[1] - '0')*10 + sx->buffer[2] - '0') << 8;
4482 for (address_item * addr = addrlist; addr != sx->first_addr; addr = addr->next)
4483 if (sx->buffer[0] == '5' || addr->transport_return == OK)
4484 addr->transport_return = PENDING_OK; /* allow set_errno action */
4485 goto RESPONSE_FAILED;
4488 /* Append the overall response to the individual PRDR response for logging
4489 and update the journal, or setup retry. */
4491 overall_message = string_printing(sx->buffer);
4492 for (address_item * addr = addrlist; addr != sx->first_addr; addr = addr->next)
4493 if (addr->transport_return == OK)
4494 addr->message = string_sprintf("%s\\n%s", addr->message, overall_message);
4496 for (address_item * addr = addrlist; addr != sx->first_addr; addr = addr->next)
4497 if (addr->transport_return == OK)
4499 if (testflag(addr, af_homonym))
4500 sprintf(CS sx->buffer, "%.500s/%s\n", addr->unique + 3, trname);
4502 sprintf(CS sx->buffer, "%.500s\n", addr->unique);
4504 DEBUG(D_deliver) debug_printf("journalling(PRDR) %s\n", sx->buffer);
4505 len = Ustrlen(CS sx->buffer);
4506 if (write(journal_fd, sx->buffer, len) != len)
4507 log_write(0, LOG_MAIN|LOG_PANIC, "failed to write journal for "
4508 "%s: %s", sx->buffer, strerror(errno));
4510 else if (addr->transport_return == DEFER)
4511 /*XXX magic value -2 ? maybe host+message ? */
4512 retry_add_item(addr, addr->address_retry_key, -2);
4516 /* Ensure the journal file is pushed out to disk. */
4518 if (EXIMfsync(journal_fd) < 0)
4519 log_write(0, LOG_MAIN|LOG_PANIC, "failed to fsync journal: %s",
4525 /* Handle general (not specific to one address) failures here. The value of ok
4526 is used to skip over this code on the falling through case. A timeout causes a
4527 deferral. Other errors may defer or fail according to the response code, and
4528 may set up a special errno value, e.g. after connection chopped, which is
4529 assumed if errno == 0 and there is no text in the buffer. If control reaches
4530 here during the setting up phase (i.e. before MAIL FROM) then always defer, as
4531 the problem is not related to this specific message. */
4536 uschar * set_message;
4542 /* Clear send_quit flag if needed. Do not set. */
4543 sx->send_quit &= check_response(host, &save_errno, addrlist->more_errno,
4544 sx->buffer, &code, &message, &pass_message);
4552 message = string_sprintf("smtp send to %s [%s] failed: %s",
4553 host->name, host->address, message ? message : US strerror(save_errno));
4554 sx->send_quit = FALSE;
4562 sx->ok = FALSE; /* For when reached by GOTO */
4563 set_message = message;
4565 /* We want to handle timeouts after MAIL or "." and loss of connection after
4566 "." specially. They can indicate a problem with the sender address or with
4567 the contents of the message rather than a real error on the connection. These
4568 cases are treated in the same way as a 4xx response. This next bit of code
4569 does the classification. */
4576 message_error = TRUE;
4580 message_error = Ustrncmp(smtp_command,"MAIL",4) == 0 ||
4581 Ustrncmp(smtp_command,"end ",4) == 0;
4584 case ERRNO_SMTPCLOSED:
4585 /* If the peer closed the TCP connection after end-of-data, but before
4586 we could send QUIT, do TLS close, etc - it is a message error.
4587 If not, and all the recipients have been dealt with, call such a close
4588 no error at all; each address_item should have a suitable result already
4589 (2xx: PENDING_OK, 4xx: DEFER, 5xx: FAIL).
4590 Otherwise, it is a non-message error. */
4592 if (!(message_error = Ustrncmp(smtp_command,"end ",4) == 0))
4594 address_item * addr;
4595 for (addr = sx->addrlist; addr; addr = addr->next)
4596 if (addr->transport_return == PENDING_DEFER)
4598 if (!addr) /* all rcpts fates determined */
4600 log_write(0, LOG_MAIN, "peer close after all rcpt responses;"
4601 " converting i/o-error to no-error");
4608 #ifndef DISABLE_DKIM
4610 /* DKIM signing failure: avoid thinking we pipelined quit,
4611 just abandon the message and close the socket. */
4613 message_error = FALSE;
4614 # ifndef DISABLE_TLS
4615 if (sx->cctx.tls_ctx)
4617 tls_close(sx->cctx.tls_ctx,
4618 sx->send_tlsclose ? TLS_SHUTDOWN_WAIT : TLS_SHUTDOWN_WONLY);
4619 sx->cctx.tls_ctx = NULL;
4625 message_error = FALSE;
4629 /* Handle the cases that are treated as message errors (as opposed to
4630 host-errors). These are:
4632 (a) negative response or timeout after MAIL
4633 (b) negative response after DATA
4634 (c) negative response or timeout or dropped connection after "."
4635 (d) utf8 support required and not offered
4637 It won't be a negative response or timeout after RCPT, as that is dealt
4638 with separately above. The action in all cases is to set an appropriate
4639 error code for all the addresses, but to leave yield set to OK because the
4640 host itself has not failed. Of course, it might in practice have failed
4641 when we've had a timeout, but if so, we'll discover that at the next
4642 delivery attempt. For a temporary error, set the message_defer flag, and
4643 write to the logs for information if this is not the last host. The error
4644 for the last host will be logged as part of the address's log line. */
4648 if (mua_wrapper) code = '5'; /* Force hard failure in wrapper mode */
4650 /* If there's an errno, the message contains just the identity of
4655 else /* Anything other than 5 is treated as temporary */
4659 message = US string_sprintf("%s: %s", message, strerror(save_errno));
4661 write_logs(host, message, sx->first_addr ? sx->first_addr->basic_errno : 0);
4663 *message_defer = TRUE;
4666 DEBUG(D_transport) if (sx->cctx.sock >= 0)
4669 if (ioctl(sx->cctx.sock, TIOCOUTQ, &n) == 0)
4670 debug_printf("%d bytes remain in socket output buffer\n", n);
4674 /* Otherwise, we have an I/O error or a timeout other than after MAIL or
4675 ".", or some other transportation error. We defer all addresses and yield
4676 DEFER, except for the case of failed add_headers expansion, or a transport
4677 filter failure, when the yield should be ERROR, to stop it trying other
4682 #ifndef DISABLE_PIPE_CONNECT
4683 /* If we were early-pipelinng and the actual EHLO response did not match
4684 the cached value we assumed, we could have detected it and passed a
4685 custom errno through to here. It would be nice to RSET and retry right
4686 away, but to reliably do that we eould need an extra synch point before
4687 we committed to data and that would discard half the gained roundrips.
4688 Or we could summarily drop the TCP connection. but that is also ugly.
4689 Instead, we ignore the possibility (having freshened the cache) and rely
4690 on the server telling us with a nonmessage error if we have tried to
4691 do something it no longer supports. */
4694 yield = (save_errno == ERRNO_CHHEADER_FAIL ||
4695 save_errno == ERRNO_FILTER_FAIL) ? ERROR : DEFER;
4699 set_errno(addrlist, save_errno, set_message, set_rc, pass_message, host,
4700 #ifdef EXPERIMENTAL_DSN_INFO
4701 sx->smtp_greeting, sx->helo_response,
4703 &sx->delivery_start);
4706 /* If all has gone well, send_quit will be set TRUE, implying we can end the
4707 SMTP session tidily. However, if there were too many addresses to send in one
4708 message (indicated by first_addr being non-NULL) we want to carry on with the
4709 rest of them. Also, it is desirable to send more than one message down the SMTP
4710 connection if there are several waiting, provided we haven't already sent so
4711 many as to hit the configured limit. The function transport_check_waiting looks
4712 for a waiting message and returns its id. We pass it back to the delivery
4713 process via the reporting pipe. The variable send_rset is FALSE if a message has
4714 just been successfully transferred.
4716 If we are already sending down a continued channel, there may be further
4717 addresses not yet delivered that are aimed at the same host, but which have not
4718 been passed in this run of the transport. In this case, continue_more will be
4719 true, and all we should do is send RSET if necessary, and return, leaving the
4722 However, if no address was disposed of, i.e. all addresses got 4xx errors, we
4723 do not want to continue with other messages down the same channel, because that
4724 can lead to looping between two or more messages, all with the same,
4725 temporarily failing address(es). [The retry information isn't updated yet, so
4726 new processes keep on trying.] We probably also don't want to try more of this
4727 message's addresses either.
4729 If we have started a TLS session, we have to end it before passing the
4730 connection to a new process. However, not all servers can handle this (Exim
4731 can), so we do not pass such a connection on if the host matches
4732 hosts_nopass_tls. */
4737 debug_printf("ok=%d send_quit=%d send_rset=%d continue_more=%d "
4738 "yield=%d first_address is %sNULL\n", sx->ok, sx->send_quit,
4739 sx->send_rset, f.continue_more, yield, sx->first_addr ? "not " : "");
4741 if (sx->completed_addr && sx->ok && sx->send_quit)
4742 #ifndef DISABLE_ESMTP_LIMITS
4743 if (mail_limit = continue_sequence >= sx->max_mail)
4746 debug_printf("reached limit %u for MAILs per conn\n", sx->max_mail);
4747 /* We will close the smtp session and connection, and clear
4748 continue_hostname. Then if there are further addrs for the message we will
4749 loop to the top of this function and make a fresh connection. Any further
4750 message found in the wait-tpt hintsdb would then do a pass-fd over the
4751 transport reporting pipe to get the connection fd back to the delivery
4757 smtp_compare_t t_compare =
4758 {.tblock = tblock, .current_sender_address = sender_address};
4760 if ( sx->first_addr /* more addrs for this message */
4761 || f.continue_more /* more addrs for continued-host */
4762 || tcw_done && tcw /* more messages for host */
4765 ( tls_out.active.sock < 0 && !continue_proxy_cipher
4766 || verify_check_given_host(CUSS &ob->hosts_nopass_tls, host) != OK
4770 transport_check_waiting(trname, host->name,
4771 sx->max_mail, continue_next_id,
4772 (oicf)smtp_are_same_identities, (void*)&t_compare)
4779 if (! (sx->ok = smtp_write_command(sx, SCMD_FLUSH, "RSET\r\n") >= 0))
4781 msg = US string_sprintf("smtp send to %s [%s] failed: %s", host->name,
4782 host->address, strerror(errno));
4783 sx->send_quit = FALSE;
4785 else if (! (sx->ok = smtp_read_response(sx, sx->buffer, sizeof(sx->buffer),
4786 '2', ob->command_timeout)))
4789 sx->send_quit = check_response(host, &errno, 0, sx->buffer, &code, &msg,
4793 DEBUG(D_transport) debug_printf("H=%s [%s] %s\n",
4794 host->name, host->address, msg);
4798 /* Either RSET was not needed, or it succeeded */
4805 continue_fd = sx->cctx.sock;
4806 if (sx->first_addr) /* More addresses still to be sent */
4807 { /* for this message */
4808 #ifndef DISABLE_ESMTP_LIMITS
4809 /* Any that we marked as skipped, reset to do now */
4810 for (address_item * a = sx->first_addr; a; a = a->next)
4811 if (a->transport_return == SKIP)
4812 a->transport_return = PENDING_DEFER;
4814 continue_sequence++; /* for consistency */
4815 pipelining_active = sx->pipelining_used; /* was cleared at DATA */
4819 /* If there is a next-message-id from the wait-transport hintsdb,
4820 pretend caller said it has further message for us. Note that we lose
4821 the TLS session (below), and that our caller will pass back the id to
4822 the delivery process. */
4824 if (f.continue_more)
4826 passback_conn = TRUE;
4827 continue_next_id[0] = '\0';
4829 else if (*continue_next_id)
4830 passback_conn = f.continue_more = TRUE;
4833 /* If we will be returning with the connection still open and have a TLS
4834 endpoint, shut down TLS if we must, or if this is a first-time passback
4835 fork a proxy process with the TLS state. */
4837 if (tls_out.active.sock >= 0)
4839 if ( (continue_hostname || passback_conn)
4840 && verify_check_given_host(CUSS &ob->hosts_noproxy_tls, host) == OK
4843 /* Not all MTAs allow for the continuation of the SMTP session when
4844 TLS is shut down. We test for this by sending a new EHLO. If we
4845 don't get a good response, we don't attempt to pass the socket on.
4846 NB: TLS close is *required* per RFC 9266 when tls-exporter info has
4847 been used, which we do under TLSv1.3 for the gsasl SCRAM*PLUS methods.
4850 tls_close(sx->cctx.tls_ctx,
4851 sx->send_tlsclose ? TLS_SHUTDOWN_WAIT : TLS_SHUTDOWN_WONLY);
4852 sx->send_tlsclose = FALSE;
4853 sx->cctx.tls_ctx = NULL;
4854 tls_out.active.sock = -1;
4855 smtp_peer_options = smtp_peer_options_wrap;
4857 && smtp_write_command(sx, SCMD_FLUSH, "EHLO %s\r\n",sx->helo_data)
4859 && smtp_read_response(sx, sx->buffer, sizeof(sx->buffer),
4860 '2', ob->command_timeout);
4862 else if (passback_conn)
4864 /* Set up a pipe for proxying TLS for the new transport process */
4866 smtp_peer_options |= OPTION_TLS;
4867 if ((sx->ok = socketpair(AF_UNIX, SOCK_STREAM, 0, pfd) == 0))
4869 int pid = exim_fork(US"tls-proxy-interproc");
4870 if (pid == 0) /* child; fork again to disconnect totally */
4872 /* does not return */
4873 smtp_proxy_tls(sx->cctx.tls_ctx, sx->buffer, sizeof(sx->buffer),
4874 pfd, ob->command_timeout, host->name);
4878 log_write(0, LOG_PANIC_DIE, "fork failed");
4881 continue_fd = pfd[1];
4882 /* tidy the inter-proc to disconn the proxy proc */
4883 waitpid(pid, NULL, 0);
4884 tls_close(sx->cctx.tls_ctx, TLS_NO_SHUTDOWN);
4885 sx->cctx.tls_ctx = NULL;
4886 (void)close(sx->cctx.sock);
4889 continue_proxy_cipher = tls_out.cipher;
4890 continue_proxy_sni = tls_out.sni;
4891 # ifdef SUPPORT_DANE
4892 continue_proxy_dane = tls_out.sni && tls_out.dane_verified;
4896 set_errno(sx->first_addr, errno, US"internal allocation problem",
4898 # ifdef EXPERIMENTAL_DSN_INFO
4899 sx->smtp_greeting, sx->helo_response,
4901 &sx->delivery_start);
4904 #endif /*DISABLE_TLS*/
4906 /* If a connection re-use is possible, arrange to pass back all the info
4907 about it so that further forks of the delivery process see it. */
4911 continue_transport = transport_name;
4912 continue_hostname = host->name;
4913 continue_host_address = host->address;
4916 continue_hostname = NULL;
4918 if (sx->ok && f.continue_more) /* More addresses for another run; */
4919 goto TIDYUP; /* skip the channel closedown */
4922 /* If RSET failed and there are addresses left, they get deferred.
4923 Do not pass back a next-id or conn info. */
4926 set_errno(sx->first_addr, errno, msg, DEFER, FALSE, host,
4927 #ifdef EXPERIMENTAL_DSN_INFO
4928 sx->smtp_greeting, sx->helo_response,
4930 &sx->delivery_start);
4934 /* End off tidily with QUIT unless the connection has died or the socket has
4935 been passed to another process. */
4939 { /* Use _MORE to get QUIT in FIN segment */
4940 (void)smtp_write_command(sx, SCMD_MORE, "QUIT\r\n");
4942 if (sx->cctx.tls_ctx && sx->send_tlsclose)
4944 # ifdef EXIM_TCP_CORK /* Use _CORK to get TLS Close Notify in FIN segment */
4945 (void) setsockopt(sx->cctx.sock, IPPROTO_TCP, EXIM_TCP_CORK, US &on, sizeof(on));
4947 tls_shutdown_wr(sx->cctx.tls_ctx);
4948 sx->send_tlsclose = FALSE;
4955 /* Close the socket, and return the appropriate value, first setting
4956 works because the NULL setting is passed back to the calling process, and
4957 remote_max_parallel is forced to 1 when delivering over an existing connection,
4959 If all went well and continue_more is set, we shouldn't actually get here if
4960 there are further addresses, as the return above will be taken. However,
4961 writing RSET might have failed, or there may be other addresses whose hosts are
4962 specified in the transports, and therefore not visible at top level, in which
4963 case continue_more won't get set. */
4967 /* This flushes data queued in the socket, being the QUIT and any TLS Close,
4968 sending them along with the client FIN flag. Us (we hope) sending FIN first
4969 means we (client) take the TIME_WAIT state, so the server (which likely has a
4970 higher connection rate) does not have to. */
4972 HDEBUG(D_transport|D_acl|D_v) debug_printf_indent(" SMTP(shutdown)>>\n");
4973 shutdown(sx->cctx.sock, SHUT_WR);
4976 if (sx->send_quit || tcw_done && !tcw)
4978 /* Wait for (we hope) ack of our QUIT, and a server FIN. Discard any data
4979 received, then discard the socket. Any packet received after then, or receive
4980 data still in the socket, will get a RST - hence the pause/drain. */
4982 /* Reap the response to QUIT, timing out after one second */
4983 (void) smtp_read_response(sx, sx->buffer, sizeof(sx->buffer), '2', 1);
4985 if (sx->cctx.tls_ctx)
4989 /* Reap the TLS Close Notify from the server, timing out after one second */
4990 sigalrm_seen = FALSE;
4993 n = tls_read(sx->cctx.tls_ctx, sx->inbuffer, sizeof(sx->inbuffer));
4994 while (!sigalrm_seen && n > 0);
4997 if (sx->send_tlsclose)
4999 # ifdef EXIM_TCP_CORK
5000 (void) setsockopt(sx->cctx.sock, IPPROTO_TCP, EXIM_TCP_CORK, US &on, sizeof(on));
5002 tls_close(sx->cctx.tls_ctx, TLS_SHUTDOWN_WAIT);
5005 tls_close(sx->cctx.tls_ctx, TLS_SHUTDOWN_WONLY);
5006 sx->cctx.tls_ctx = NULL;
5010 /* Drain any trailing data from the socket before close, to avoid sending a RST */
5012 if ( poll_one_fd(sx->cctx.sock, POLLIN, 20) != 0 /* 20ms */
5013 && fcntl(sx->cctx.sock, F_SETFL, O_NONBLOCK) == 0)
5014 for (int i = 16, n; /* drain socket */
5015 (n = read(sx->cctx.sock, sx->inbuffer, sizeof(sx->inbuffer))) > 0 && i > 0;
5016 i--) HDEBUG(D_transport|D_acl|D_v)
5019 debug_printf_indent(" SMTP(drain %d bytes)<< %.*s\n", n, m, sx->inbuffer);
5020 for (m = 0; m < n; m++)
5021 debug_printf("0x%02x\n", sx->inbuffer[m]);
5024 HDEBUG(D_transport|D_acl|D_v) debug_printf_indent(" SMTP(close)>>\n");
5025 (void)close(sx->cctx.sock);
5027 continue_hostname = NULL;
5028 continue_next_id[0] = '\0';
5030 #ifndef DISABLE_EVENT
5031 (void) event_raise(tblock->event_action, US"tcp:close", NULL, NULL);
5037 sx->first_addr = NULL;
5038 for (address_item * a = sx->addrlist->next; a; a = a->next)
5039 if (a->transport_return == DANE)
5041 a->transport_return = PENDING_DEFER;
5042 if (!sx->first_addr)
5044 /* Remember the new start-point in the addrlist, for smtp_setup_conn()
5045 to get the domain string for SNI */
5048 DEBUG(D_transport) debug_printf("DANE: go-around for %s\n", a->domain);
5051 continue_sequence = 1; /* for consistency */
5056 #ifndef DISABLE_ESMTP_LIMITS
5057 if (mail_limit && sx->first_addr)
5059 /* Reset the sequence count since we closed the connection. This is flagged
5060 on the pipe back to the delivery process so that it can reset it's count.
5061 Also set flags on the addr so that a non-continued-conn delivery is logged. */
5063 continue_sequence = 1; /* for consistency */
5064 goto REPEAT_CONN; /* open a fresh connection */
5069 smtp_debug_cmd_report();
5074 if (dane_held) for (address_item * a = sx->addrlist->next; a; a = a->next)
5075 if (a->transport_return == DANE)
5076 a->transport_return = PENDING_DEFER;
5084 /*************************************************
5085 * Closedown entry point *
5086 *************************************************/
5088 /* This function is called when exim is passed an open smtp channel
5089 from another incarnation, but the message which it has been asked
5090 to deliver no longer exists. The channel is on stdin.
5092 We might do fancy things like looking for another message to send down
5093 the channel, but if the one we sought has gone, it has probably been
5094 delivered by some other process that itself will seek further messages,
5095 so just close down our connection.
5097 Argument: pointer to the transport instance block
5102 smtp_transport_closedown(transport_instance * tblock)
5104 smtp_transport_options_block * ob = tblock->drinst.options_block;
5105 client_conn_ctx cctx;
5106 smtp_context sx = {0};
5108 uschar inbuffer[4096];
5109 uschar outbuffer[16];
5111 /*XXX really we need an active-smtp-client ctx, rather than assuming stdout */
5112 cctx.sock = fileno(stdin);
5113 cctx.tls_ctx = cctx.sock == tls_out.active.sock ? tls_out.active.tls_ctx : NULL;
5115 sx.inblock.cctx = &cctx;
5116 sx.inblock.buffer = inbuffer;
5117 sx.inblock.buffersize = sizeof(inbuffer);
5118 sx.inblock.ptr = inbuffer;
5119 sx.inblock.ptrend = inbuffer;
5121 sx.outblock.cctx = &cctx;
5122 sx.outblock.buffersize = sizeof(outbuffer);
5123 sx.outblock.buffer = outbuffer;
5124 sx.outblock.ptr = outbuffer;
5125 sx.outblock.cmd_count = 0;
5126 sx.outblock.authenticating = FALSE;
5128 (void)smtp_write_command(&sx, SCMD_FLUSH, "QUIT\r\n");
5129 (void)smtp_read_response(&sx, buffer, sizeof(buffer), '2', ob->command_timeout);
5130 (void)close(cctx.sock);
5135 /*************************************************
5136 * Prepare addresses for delivery *
5137 *************************************************/
5139 /* This function is called to flush out error settings from previous delivery
5140 attempts to other hosts. It also records whether we got here via an MX record
5141 or not in the more_errno field of the address. We are interested only in
5142 addresses that are still marked DEFER - others may have got delivered to a
5143 previously considered IP address. Set their status to PENDING_DEFER to indicate
5144 which ones are relevant this time.
5147 addrlist the list of addresses
5148 host the host we are delivering to
5150 Returns: the first address for this delivery
5153 static address_item *
5154 prepare_addresses(address_item * addrlist, host_item * host)
5156 address_item * first_addr = NULL;
5157 for (address_item * addr = addrlist; addr; addr = addr->next)
5158 if (addr->transport_return == DEFER)
5160 if (!first_addr) first_addr = addr;
5161 addr->transport_return = PENDING_DEFER;
5162 addr->basic_errno = 0;
5163 addr->more_errno = host->mx >= 0 ? 'M' : 'A';
5164 addr->message = NULL;
5166 addr->cipher = NULL;
5167 addr->ourcert = NULL;
5168 addr->peercert = NULL;
5169 addr->peerdn = NULL;
5170 addr->ocsp = OCSP_NOT_REQ;
5171 addr->tlsver = NULL;
5173 #ifdef EXPERIMENTAL_DSN_INFO
5174 addr->smtp_greeting = NULL;
5175 addr->helo_response = NULL;
5183 /*************************************************
5184 * Main entry point *
5185 *************************************************/
5187 /* See local README for interface details. As this is a remote transport, it is
5188 given a chain of addresses to be delivered in one connection, if possible. It
5189 always returns TRUE, indicating that each address has its own independent
5190 status set, except if there is a setting up problem, in which case it returns
5194 smtp_transport_entry(
5195 transport_instance * tblock, /* data for this instantiation */
5196 address_item * addrlist) /* addresses we are working on */
5198 smtp_transport_options_block * ob = tblock->drinst.options_block;
5199 const uschar * trname = tblock->drinst.name;
5201 int hosts_defer = 0, hosts_fail = 0, hosts_looked_up = 0;
5202 int hosts_retry = 0, hosts_serial = 0, hosts_total = 0, total_hosts_tried = 0;
5203 BOOL expired = TRUE;
5204 uschar * expanded_hosts = NULL, * pistring;
5205 uschar * tid = string_sprintf("%s transport", trname);
5206 host_item * hostlist = addrlist->host_list, * host = NULL;
5210 debug_printf("%s transport entered\n", trname);
5211 for (address_item * addr = addrlist; addr; addr = addr->next)
5212 debug_printf(" %s\n", addr->address);
5215 debug_printf("hostlist:\n");
5216 for (host_item * host = hostlist; host; host = host->next)
5217 debug_printf(" '%s' IP %s port %d\n", host->name, host->address, host->port);
5219 if (continue_hostname)
5220 debug_printf("already connected to %s [%s] (on fd %d)\n",
5221 continue_hostname, continue_host_address,
5222 cutthrough.cctx.sock >= 0 ? cutthrough.cctx.sock : 0);
5225 /* Check the restrictions on line length */
5227 if (max_received_linelength > ob->message_linelength_limit)
5230 gettimeofday(&now, NULL);
5232 for (address_item * addr = addrlist; addr; addr = addr->next)
5233 if (addr->transport_return == DEFER)
5234 addr->transport_return = PENDING_DEFER;
5236 set_errno_nohost(addrlist, ERRNO_SMTPFORMAT,
5237 US"message has lines too long for transport", FAIL, TRUE, &now);
5241 /* Set the flag requesting that these hosts be added to the waiting
5242 database if the delivery fails temporarily or if we are running with
5243 queue_smtp or a 2-stage queue run. This gets unset for certain
5244 kinds of error, typically those that are specific to the message. */
5246 update_waiting = TRUE;
5248 /* If a host list is not defined for the addresses - they must all have the
5249 same one in order to be passed to a single transport - or if the transport has
5250 a host list with hosts_override set, use the host list supplied with the
5251 transport. It is an error for this not to exist. */
5253 if (!hostlist || (ob->hosts_override && ob->hosts))
5257 addrlist->message = string_sprintf("%s transport called with no hosts set",
5259 addrlist->transport_return = PANIC;
5260 return FALSE; /* Only top address has status */
5263 DEBUG(D_transport) debug_printf("using the transport's hosts: %s\n",
5266 /* If the transport's host list contains no '$' characters, and we are not
5267 randomizing, it is fixed and therefore a chain of hosts can be built once
5268 and for all, and remembered for subsequent use by other calls to this
5269 transport. If, on the other hand, the host list does contain '$', or we are
5270 randomizing its order, we have to rebuild it each time. In the fixed case,
5271 as the hosts string will never be used again, it doesn't matter that we
5272 replace all the : characters with zeros. */
5276 uschar *s = ob->hosts;
5278 if (Ustrchr(s, '$'))
5280 if (!(expanded_hosts = expand_string(s)))
5282 addrlist->message = string_sprintf("failed to expand list of hosts "
5283 "\"%s\" in %s transport: %s", s, trname, expand_string_message);
5284 addrlist->transport_return = f.search_find_defer ? DEFER : PANIC;
5285 return FALSE; /* Only top address has status */
5287 DEBUG(D_transport) debug_printf("expanded list of hosts \"%s\" to "
5288 "\"%s\"\n", s, expanded_hosts);
5292 if (ob->hosts_randomize) s = expanded_hosts = string_copy(s);
5296 log_write(0, LOG_MAIN|LOG_PANIC,
5297 "attempt to use tainted host list '%s' from '%s' in transport %s",
5298 s, ob->hosts, trname);
5299 /* Avoid leaking info to an attacker */
5300 addrlist->message = US"internal configuration error";
5301 addrlist->transport_return = PANIC;
5305 host_build_hostlist(&hostlist, s, ob->hosts_randomize);
5307 /* Check that the expansion yielded something useful. */
5311 string_sprintf("%s transport has empty hosts setting", trname);
5312 addrlist->transport_return = PANIC;
5313 return FALSE; /* Only top address has status */
5316 /* If there was no expansion of hosts, save the host list for
5319 if (!expanded_hosts) ob->hostlist = hostlist;
5322 /* This is not the first time this transport has been run in this delivery;
5323 the host list was built previously. */
5326 hostlist = ob->hostlist;
5329 /* The host list was supplied with the address. If hosts_randomize is set, we
5330 must sort it into a random order if it did not come from MX records and has not
5331 already been randomized (but don't bother if continuing down an existing
5334 else if (ob->hosts_randomize && hostlist->mx == MX_NONE && !continue_hostname)
5336 host_item *newlist = NULL;
5339 host_item *h = hostlist;
5340 hostlist = hostlist->next;
5342 h->sort_key = random_number(100);
5349 else if (h->sort_key < newlist->sort_key)
5356 host_item *hh = newlist;
5359 if (h->sort_key < hh->next->sort_key) break;
5367 hostlist = addrlist->host_list = newlist;
5370 /* Sort out the default port. */
5372 if (!smtp_get_port(ob->port, addrlist, &defport, tid)) return FALSE;
5374 /* For each host-plus-IP-address on the list:
5376 . If this is a continued delivery and the host isn't the one with the
5377 current connection, skip.
5379 . If the status is unusable (i.e. previously failed or retry checked), skip.
5381 . If no IP address set, get the address, either by turning the name into
5382 an address, calling gethostbyname if gethostbyname is on, or by calling
5383 the DNS. The DNS may yield multiple addresses, in which case insert the
5384 extra ones into the list.
5386 . Get the retry data if not previously obtained for this address and set the
5387 field which remembers the state of this address. Skip if the retry time is
5388 not reached. If not, remember whether retry data was found. The retry string
5389 contains both the name and the IP address.
5391 . Scan the list of addresses and mark those whose status is DEFER as
5392 PENDING_DEFER. These are the only ones that will be processed in this cycle
5395 . Make a delivery attempt - addresses marked PENDING_DEFER will be tried.
5396 Some addresses may be successfully delivered, others may fail, and yet
5397 others may get temporary errors and so get marked DEFER.
5399 . The return from the delivery attempt is OK if a connection was made and a
5400 valid SMTP dialogue was completed. Otherwise it is DEFER.
5402 . If OK, add a "remove" retry item for this host/IPaddress, if any.
5404 . If fail to connect, or other defer state, add a retry item.
5406 . If there are any addresses whose status is still DEFER, carry on to the
5407 next host/IPaddress, unless we have tried the number of hosts given
5408 by hosts_max_try or hosts_max_try_hardlimit; otherwise return. Note that
5409 there is some fancy logic for hosts_max_try that means its limit can be
5410 overstepped in some circumstances.
5412 If we get to the end of the list, all hosts have deferred at least one address,
5413 or not reached their retry times. If delay_after_cutoff is unset, it requests a
5414 delivery attempt to those hosts whose last try was before the arrival time of
5415 the current message. To cope with this, we have to go round the loop a second
5416 time. After that, set the status and error data for any addresses that haven't
5417 had it set already. */
5419 for (int cutoff_retry = 0;
5420 expired && cutoff_retry < (ob->delay_after_cutoff ? 1 : 2);
5423 host_item *nexthost = NULL;
5424 int unexpired_hosts_tried = 0;
5425 BOOL continue_host_tried = FALSE;
5427 retry_non_continued:
5428 for (host = hostlist;
5430 && unexpired_hosts_tried < ob->hosts_max_try
5431 && total_hosts_tried < ob->hosts_max_try_hardlimit;
5435 BOOL host_is_expired = FALSE, message_defer = FALSE, some_deferred = FALSE;
5436 address_item * first_addr = NULL;
5437 uschar * interface = NULL;
5438 const uschar * retry_host_key = NULL, * retry_message_key = NULL;
5439 uschar * serialize_key = NULL;
5441 /* Deal slightly better with a possible Linux kernel bug that results
5442 in intermittent TFO-conn fails deep into the TCP flow. Bug 2907 tracks.
5443 Hack: Clear TFO option for any further hosts on this tpt run. */
5445 if (total_hosts_tried > 0)
5447 DEBUG(D_transport|D_acl|D_v)
5448 debug_printf("Clearing TFO as not first host for message\n");
5449 ob->hosts_try_fastopen = US"";
5452 /* Default next host is next host. :-) But this can vary if the
5453 hosts_max_try limit is hit (see below). It may also be reset if a host
5454 address is looked up here (in case the host was multihomed). */
5456 nexthost = host->next;
5458 /* If the address hasn't yet been obtained from the host name, look it up
5459 now, unless the host is already marked as unusable. If it is marked as
5460 unusable, it means that the router was unable to find its IP address (in
5461 the DNS or wherever) OR we are in the 2nd time round the cutoff loop, and
5462 the lookup failed last time. We don't get this far if *all* MX records
5463 point to non-existent hosts; that is treated as a hard error.
5465 We can just skip this host entirely. When the hosts came from the router,
5466 the address will timeout based on the other host(s); when the address is
5467 looked up below, there is an explicit retry record added.
5469 Note that we mustn't skip unusable hosts if the address is not unset; they
5470 may be needed as expired hosts on the 2nd time round the cutoff loop. */
5474 int new_port, flags;
5476 if (host->status >= hstatus_unusable)
5478 DEBUG(D_transport) debug_printf("%s has no address and is unusable - skipping\n",
5483 DEBUG(D_transport) debug_printf("getting address for %s\n", host->name);
5485 /* The host name is permitted to have an attached port. Find it, and
5486 strip it from the name. Just remember it for now. */
5488 new_port = host_item_get_port(host);
5490 /* Count hosts looked up */
5494 /* Find by name if so configured, or if it's an IP address. We don't
5495 just copy the IP address, because we need the test-for-local to happen. */
5497 flags = HOST_FIND_BY_A | HOST_FIND_BY_AAAA;
5498 if (ob->dns_qualify_single) flags |= HOST_FIND_QUALIFY_SINGLE;
5499 if (ob->dns_search_parents) flags |= HOST_FIND_SEARCH_PARENTS;
5501 if (ob->gethostbyname || string_is_ip_address(host->name, NULL) != 0)
5502 rc = host_find_byname(host, NULL, flags, NULL, TRUE);
5504 rc = host_find_bydns(host, NULL, flags, NULL, NULL, NULL,
5505 &ob->dnssec, /* domains for request/require */
5508 /* Update the host (and any additional blocks, resulting from
5509 multihoming) with a host-specific port, if any. */
5511 for (host_item * hh = host; hh != nexthost; hh = hh->next) hh->port = new_port;
5513 /* Failure to find the host at this time (usually DNS temporary failure)
5514 is really a kind of routing failure rather than a transport failure.
5515 Therefore we add a retry item of the routing kind, not to stop us trying
5516 to look this name up here again, but to ensure the address gets timed
5517 out if the failures go on long enough. A complete failure at this point
5518 commonly points to a configuration error, but the best action is still
5519 to carry on for the next host. */
5521 if (rc == HOST_FIND_AGAIN || rc == HOST_FIND_SECURITY || rc == HOST_FIND_FAILED)
5523 retry_add_item(addrlist, string_sprintf("R:%s", host->name), 0);
5525 if (rc == HOST_FIND_AGAIN) hosts_defer++; else hosts_fail++;
5526 DEBUG(D_transport) debug_printf("rc = %s for %s\n", (rc == HOST_FIND_AGAIN)?
5527 "HOST_FIND_AGAIN" : "HOST_FIND_FAILED", host->name);
5528 host->status = hstatus_unusable;
5530 for (address_item * addr = addrlist; addr; addr = addr->next)
5532 if (addr->transport_return != DEFER) continue;
5533 addr->basic_errno = ERRNO_UNKNOWNHOST;
5534 addr->message = string_sprintf(
5535 rc == HOST_FIND_SECURITY
5536 ? "lookup of IP address for %s was insecure"
5537 : "failed to lookup IP address for %s",
5543 /* If the host is actually the local host, we may have a problem, or
5544 there may be some cunning configuration going on. In the problem case,
5545 log things and give up. The default transport status is already DEFER. */
5547 if (rc == HOST_FOUND_LOCAL && !ob->allow_localhost)
5549 for (address_item * addr = addrlist; addr; addr = addr->next)
5551 addr->basic_errno = ERRNO_HOST_IS_LOCAL;
5552 addr->message = string_sprintf("%s transport found host %s to be "
5553 "local", trname, host->name);
5557 } /* End of block for IP address lookup */
5559 /* If this is a continued delivery, we are interested only in the host
5560 which matches the name of the existing open channel. The check is put
5561 here after the local host lookup, in case the name gets expanded as a
5562 result of the lookup. Set expired FALSE, to save the outer loop executing
5565 if (continue_sequence > 1)
5566 if ( Ustrcmp(continue_hostname, host->name) != 0
5567 || Ustrcmp(continue_host_address, host->address) != 0
5571 continue; /* With next host */
5574 continue_host_tried = TRUE;
5576 /* Reset the default next host in case a multihomed host whose addresses
5577 are not looked up till just above added to the host list. */
5579 nexthost = host->next;
5581 /* If queue_smtp is set (-odqs or the first part of a 2-stage run), or the
5582 domain is in queue_smtp_domains, we don't actually want to attempt any
5583 deliveries. When doing a queue run, queue_smtp_domains is always unset. If
5584 there is a lookup defer in queue_smtp_domains, proceed as if the domain
5585 were not in it. We don't want to hold up all SMTP deliveries! Except when
5586 doing a two-stage queue run, don't do this if forcing. */
5588 if ( (!f.deliver_force || f.queue_2stage)
5590 || match_isinlist(addrlist->domain,
5591 CUSS &queue_smtp_domains, 0,
5592 &domainlist_anchor, NULL, MCL_DOMAIN, TRUE, NULL) == OK)
5595 DEBUG(D_transport) debug_printf("first-pass routing only\n");
5597 for (address_item * addr = addrlist; addr; addr = addr->next)
5598 if (addr->transport_return == DEFER)
5599 addr->message = US"first-pass only routing due to -odqs, "
5600 "queue_smtp_domains or control=queue";
5601 continue; /* With next host */
5604 /* Count hosts being considered - purely for an intelligent comment
5605 if none are usable. */
5609 /* Set $host and $host address now in case they are needed for the
5610 interface expansion or the serialize_hosts check; they remain set if an
5611 actual delivery happens. */
5613 deliver_host = host->name;
5614 deliver_host_address = host->address;
5615 lookup_dnssec_authenticated = host->dnssec == DS_YES ? US"yes"
5616 : host->dnssec == DS_NO ? US"no"
5619 /* Set up a string for adding to the retry key if the port number is not
5620 the standard SMTP port. A host may have its own port setting that overrides
5623 pistring = string_sprintf(":%d", host->port == PORT_NONE
5624 ? defport : host->port);
5625 if (Ustrcmp(pistring, ":25") == 0) pistring = US"";
5627 /* Select IPv4 or IPv6, and choose an outgoing interface. If the interface
5628 string is set, even if constant (as different transports can have different
5629 constant settings), we must add it to the key that is used for retries,
5630 because connections to the same host from a different interface should be
5631 treated separately. */
5633 host_af = Ustrchr(host->address, ':') ? AF_INET6 : AF_INET;
5636 GET_OPTION("interface");
5637 if ((s = ob->interface) && *s)
5639 if (!smtp_get_interface(s, host_af, addrlist, &interface, tid))
5642 if (continue_sequence > 1)
5644 union sockaddr_46 interface_sock;
5645 EXIM_SOCKLEN_T size = sizeof(interface_sock);
5646 const uschar * local_ip_addr;
5648 /* Assume the connection is on fd 0 */
5649 if (getsockname(0, (struct sockaddr *) &interface_sock, &size) < 0)
5652 debug_printf_indent("failed getsockname: %s\n", strerror(errno));
5655 local_ip_addr = host_ntoa(-1, &interface_sock, NULL, &sending_port);
5656 if (Ustrcmp(interface, local_ip_addr) != 0)
5658 DEBUG(D_transport) debug_printf_indent(
5659 "tpt interface option mismatch with continued-connection\n");
5660 /* Close the conn and recheck retry info */
5661 continue_host_tried = FALSE;
5666 pistring = string_sprintf("%s/%s", pistring, interface);
5670 /* The first time round the outer loop, check the status of the host by
5671 inspecting the retry data. The second time round, we are interested only
5672 in expired hosts that haven't been tried since this message arrived. */
5674 if (cutoff_retry == 0)
5677 /* Ensure the status of the address is set by checking retry data if
5678 necessary. There may be host-specific retry data (applicable to all
5679 messages) and also data for retries of a specific message at this host.
5680 If either of these retry records are actually read, the keys used are
5681 returned to save recomputing them later. */
5683 if (exp_bool(addrlist, US"transport", trname, D_transport,
5684 US"retry_include_ip_address", ob->retry_include_ip_address,
5685 ob->expand_retry_include_ip_address, &incl_ip) != OK)
5686 continue; /* with next host */
5688 host_is_expired = retry_check_address(addrlist->domain, host, pistring,
5689 incl_ip, &retry_host_key, &retry_message_key);
5691 DEBUG(D_transport) debug_printf("%s [%s]%s retry-status = %s\n", host->name,
5692 host->address ? host->address : US"", pistring,
5693 host->status == hstatus_usable ? "usable"
5694 : host->status == hstatus_unusable ? "unusable"
5695 : host->status == hstatus_unusable_expired ? "unusable (expired)" : "?");
5697 /* Skip this address if not usable at this time, noting if it wasn't
5698 actually expired, both locally and in the address. */
5700 switch (host->status)
5702 case hstatus_unusable:
5704 setflag(addrlist, af_retry_skipped);
5707 case hstatus_unusable_expired:
5710 case hwhy_retry: hosts_retry++; break;
5711 case hwhy_failed: hosts_fail++; break;
5713 case hwhy_deferred: hosts_defer++; break;
5716 /* If there was a retry message key, implying that previously there
5717 was a message-specific defer, we don't want to update the list of
5718 messages waiting for these hosts. */
5720 if (retry_message_key) update_waiting = FALSE;
5721 continue; /* With the next host or IP address */
5725 /* Second time round the loop: if the address is set but expired, and
5726 the message is newer than the last try, let it through. */
5731 || host->status != hstatus_unusable_expired
5732 || host->last_try > received_time.tv_sec)
5734 DEBUG(D_transport) debug_printf("trying expired host %s [%s]%s\n",
5735 host->name, host->address, pistring);
5736 host_is_expired = TRUE;
5739 /* Setting "expired=FALSE" doesn't actually mean not all hosts are expired;
5740 it remains TRUE only if all hosts are expired and none are actually tried.
5745 /* If this host is listed as one to which access must be serialized,
5746 see if another Exim process has a connection to it, and if so, skip
5747 this host. If not, update the database to record our connection to it
5748 and remember this for later deletion. Do not do any of this if we are
5749 sending the message down a pre-existing connection. */
5751 if ( !continue_hostname
5752 && verify_check_given_host(CUSS &ob->serialize_hosts, host) == OK)
5754 serialize_key = string_sprintf("host-serialize-%s", host->name);
5755 if (!enq_start(serialize_key, 1))
5758 debug_printf("skipping host %s because another Exim process "
5759 "is connected to it\n", host->name);
5765 /* OK, we have an IP address that is not waiting for its retry time to
5766 arrive (it might be expired) OR (second time round the loop) we have an
5767 expired host that hasn't been tried since the message arrived. Have a go
5768 at delivering the message to it. First prepare the addresses by flushing
5769 out the result of previous attempts, and finding the first address that
5770 is still to be delivered. */
5772 if (!(first_addr = prepare_addresses(addrlist, host)))
5774 /* Obscure situation; at least one case (bug 3059, fixed) where
5775 a previous host try returned DEFER, but having moved all
5776 recipients away from DEFER (the waiting-to-be-done state). */
5777 DEBUG(D_transport) debug_printf("no pending recipients\n");
5781 DEBUG(D_transport) debug_printf("delivering %s to %s [%s] (%s%s)\n",
5782 message_id, host->name, host->address, addrlist->address,
5783 addrlist->next ? ", ..." : "");
5785 set_process_info("delivering %s to %s [%s]%s (%s%s)",
5786 message_id, host->name, host->address, pistring, addrlist->address,
5787 addrlist->next ? ", ..." : "");
5789 /* This is not for real; don't do the delivery. If there are
5790 any remaining hosts, list them. */
5795 gettimeofday(&now, NULL);
5796 set_errno_nohost(addrlist, 0, NULL, OK, FALSE, &now);
5797 for (address_item * addr = addrlist; addr; addr = addr->next)
5799 addr->host_used = host;
5800 addr->special_action = '*';
5801 addr->message = US"delivery bypassed by -N option";
5805 debug_printf("*** delivery by %s transport bypassed by -N option\n"
5806 "*** host and remaining hosts:\n", trname);
5807 for (host_item * host2 = host; host2; host2 = host2->next)
5808 debug_printf(" %s [%s]\n", host2->name,
5809 host2->address ? host2->address : US"unset");
5814 /* This is for real. If the host is expired, we don't count it for
5815 hosts_max_retry. This ensures that all hosts must expire before an address
5816 is timed out, unless hosts_max_try_hardlimit (which protects against
5817 lunatic DNS configurations) is reached.
5819 If the host is not expired and we are about to hit the hosts_max_retry
5820 limit, check to see if there is a subsequent hosts with a different MX
5821 value. If so, make that the next host, and don't count this one. This is a
5822 heuristic to make sure that different MXs do get tried. With a normal kind
5823 of retry rule, they would get tried anyway when the earlier hosts were
5824 delayed, but if the domain has a "retry every time" type of rule - as is
5825 often used for the the very large ISPs, that won't happen. */
5830 /* Make a copy of the host if it is local to this invocation
5831 of the transport. */
5835 thost = store_get(sizeof(host_item), GET_UNTAINTED);
5837 thost->name = string_copy(host->name);
5838 thost->address = string_copy(host->address);
5843 if (!host_is_expired && ++unexpired_hosts_tried >= ob->hosts_max_try)
5846 debug_printf("hosts_max_try limit reached with this host\n");
5847 for (host_item * h = host; h; h = h->next) if (h->mx != host->mx)
5850 unexpired_hosts_tried--;
5851 DEBUG(D_transport) debug_printf("however, a higher MX host exists "
5852 "and will be tried\n");
5857 /* Attempt the delivery. */
5859 total_hosts_tried++;
5860 rc = smtp_deliver(addrlist, thost, host_af, defport, interface, tblock,
5861 &message_defer, FALSE);
5864 OK => connection made, each address contains its result;
5865 message_defer is set for message-specific defers (when all
5866 recipients are marked defer)
5867 DEFER => there was a non-message-specific delivery problem;
5868 ERROR => there was a problem setting up the arguments for a filter,
5869 or there was a problem with expanding added headers
5872 /* If the result is not OK, there was a non-message-specific problem.
5873 If the result is DEFER, we need to write to the logs saying what happened
5874 for this particular host, except in the case of authentication and TLS
5875 failures, where the log has already been written. If all hosts defer a
5876 general message is written at the end. */
5878 if (rc == DEFER && first_addr->basic_errno != ERRNO_AUTHFAIL
5879 && first_addr->basic_errno != ERRNO_TLSFAILURE)
5880 write_logs(host, first_addr->message, first_addr->basic_errno);
5882 #ifndef DISABLE_EVENT
5884 deferred_event_raise(first_addr, host, US"msg:host:defer");
5887 /* If STARTTLS was accepted, but there was a failure in setting up the
5888 TLS session (usually a certificate screwup), and the host is not in
5889 hosts_require_tls, and tls_tempfail_tryclear is true, try again, with
5890 TLS forcibly turned off. We have to start from scratch with a new SMTP
5891 connection. That's why the retry is done from here, not from within
5892 smtp_deliver(). [Rejections of STARTTLS itself don't screw up the
5893 session, so the in-clear transmission after those errors, if permitted,
5894 happens inside smtp_deliver().] */
5898 && first_addr->basic_errno == ERRNO_TLSFAILURE
5899 && ob->tls_tempfail_tryclear
5900 && verify_check_given_host(CUSS &ob->hosts_require_tls, host) != OK
5903 log_write(0, LOG_MAIN,
5904 "%s: delivering unencrypted to H=%s [%s] (not in hosts_require_tls)",
5905 first_addr->message, host->name, host->address);
5906 first_addr = prepare_addresses(addrlist, host);
5907 rc = smtp_deliver(addrlist, thost, host_af, defport, interface, tblock,
5908 &message_defer, TRUE);
5909 if (rc == DEFER && first_addr->basic_errno != ERRNO_AUTHFAIL)
5910 write_logs(host, first_addr->message, first_addr->basic_errno);
5911 # ifndef DISABLE_EVENT
5913 deferred_event_raise(first_addr, host, US"msg:host:defer");
5916 #endif /*DISABLE_TLS*/
5918 #ifndef DISABLE_EVENT
5919 /* If the last host gave a defer raise a per-message event */
5922 && unexpired_hosts_tried < ob->hosts_max_try
5923 && total_hosts_tried < ob->hosts_max_try_hardlimit
5925 && (message_defer || rc == DEFER)
5927 deferred_event_raise(first_addr, host, US"msg:defer");
5931 /* Delivery attempt finished */
5933 set_process_info("delivering %s: just tried %s [%s]%s for %s%s: result %s",
5934 message_id, host->name, host->address, pistring, addrlist->address,
5935 addrlist->next ? " (& others)" : "", rc_to_string(rc));
5937 /* Release serialization if set up */
5939 if (serialize_key) enq_end(serialize_key);
5941 /* If the result is DEFER, or if a host retry record is known to exist, we
5942 need to add an item to the retry chain for updating the retry database
5943 at the end of delivery. We only need to add the item to the top address,
5944 of course. Also, if DEFER, we mark the IP address unusable so as to skip it
5945 for any other delivery attempts using the same address. (It is copied into
5946 the unusable tree at the outer level, so even if different address blocks
5947 contain the same address, it still won't get tried again.) */
5949 if (rc == DEFER || retry_host_key)
5951 int delete_flag = rc != DEFER ? rf_delete : 0;
5952 if (!retry_host_key)
5955 if (exp_bool(addrlist, US"transport", trname, D_transport,
5956 US"retry_include_ip_address", ob->retry_include_ip_address,
5957 ob->expand_retry_include_ip_address, &incl_ip) != OK)
5958 incl_ip = TRUE; /* error; use most-specific retry record */
5960 retry_host_key = retry_host_key_build(host, incl_ip, pistring);
5963 /* If a delivery of another message over an existing SMTP connection
5964 yields DEFER, we do NOT set up retry data for the host. This covers the
5965 case when there are delays in routing the addresses in the second message
5966 that are so long that the server times out. This is alleviated by not
5967 routing addresses that previously had routing defers when handling an
5968 existing connection, but even so, this case may occur (e.g. if a
5969 previously happily routed address starts giving routing defers). If the
5970 host is genuinely down, another non-continued message delivery will
5971 notice it soon enough. */
5973 if (delete_flag != 0 || !continue_hostname)
5974 retry_add_item(first_addr, retry_host_key, rf_host | delete_flag);
5976 /* We may have tried an expired host, if its retry time has come; ensure
5977 the status reflects the expiry for the benefit of any other addresses. */
5981 host->status = host_is_expired
5982 ? hstatus_unusable_expired : hstatus_unusable;
5983 host->why = hwhy_deferred;
5987 /* If message_defer is set (host was OK, but every recipient got deferred
5988 because of some message-specific problem), or if that had happened
5989 previously so that a message retry key exists, add an appropriate item
5990 to the retry chain. Note that if there was a message defer but now there is
5991 a host defer, the message defer record gets deleted. That seems perfectly
5992 reasonable. Also, stop the message from being remembered as waiting
5993 for specific hosts. */
5995 if (message_defer || retry_message_key)
5997 int delete_flag = message_defer ? 0 : rf_delete;
5998 if (!retry_message_key)
6001 if (exp_bool(addrlist, US"transport", trname, D_transport,
6002 US"retry_include_ip_address", ob->retry_include_ip_address,
6003 ob->expand_retry_include_ip_address, &incl_ip) != OK)
6004 incl_ip = TRUE; /* error; use most-specific retry record */
6006 retry_message_key = string_sprintf("%s:%s",
6007 retry_host_key_build(host, incl_ip, pistring), message_id);
6009 retry_add_item(addrlist, retry_message_key,
6010 rf_message | rf_host | delete_flag);
6011 update_waiting = FALSE;
6014 /* Any return other than DEFER (that is, OK or ERROR) means that the
6015 addresses have got their final statuses filled in for this host. In the OK
6016 case, see if any of them are deferred. */
6019 for (address_item * addr = addrlist; addr; addr = addr->next)
6020 if (addr->transport_return == DEFER)
6021 { some_deferred = TRUE; break; }
6023 /* If no addresses deferred or the result was ERROR, return. We do this for
6024 ERROR because a failing filter set-up or add_headers expansion is likely to
6025 fail for any host we try. */
6027 if (rc == ERROR || (rc == OK && !some_deferred))
6030 /* If the result was DEFER or some individual addresses deferred, let
6031 the loop run to try other hosts with the deferred addresses, except for the
6032 case when we were trying to deliver down an existing channel and failed.
6033 Don't try any other hosts in this case. */
6035 if (continue_sequence > 1) break;
6037 /* If the whole delivery, or some individual addresses, were deferred and
6038 there are more hosts that could be tried, do not count this host towards
6039 the hosts_max_try limit if the age of the message is greater than the
6040 maximum retry time for this host. This means we may try try all hosts,
6041 ignoring the limit, when messages have been around for some time. This is
6042 important because if we don't try all hosts, the address will never time
6043 out. NOTE: this does not apply to hosts_max_try_hardlimit. */
6045 if ((rc == DEFER || some_deferred) && nexthost)
6048 retry_config * retry = retry_find_config(host->name, NULL, 0, 0);
6050 if (retry && retry->rules)
6052 retry_rule *last_rule;
6053 for (last_rule = retry->rules;
6055 last_rule = last_rule->next);
6056 timedout = time(NULL) - received_time.tv_sec > last_rule->timeout;
6058 else timedout = TRUE; /* No rule => timed out */
6062 unexpired_hosts_tried--;
6063 DEBUG(D_transport) debug_printf("temporary delivery error(s) override "
6064 "hosts_max_try (message older than host's retry time)\n");
6070 if (unexpired_hosts_tried >= ob->hosts_max_try)
6071 debug_printf("reached transport hosts_max_try limit %d\n",
6073 if (total_hosts_tried >= ob->hosts_max_try_hardlimit)
6074 debug_printf("reached transport hosts_max_try_hardlimit limit %d\n",
6075 ob->hosts_max_try_hardlimit);
6078 testharness_pause_ms(500); /* let server debug out */
6079 } /* End of loop for trying multiple hosts. */
6081 /* If we failed to find a matching host in the list, for an already-open
6082 connection, just close it and start over with the list. This can happen
6083 for routing that changes from run to run, or big multi-IP sites with
6086 if (continue_sequence > 1 && !continue_host_tried)
6088 int fd = cutthrough.cctx.sock >= 0 ? cutthrough.cctx.sock : 0;
6090 DEBUG(D_transport) debug_printf("no hosts match already-open connection\n");
6091 DEBUG(D_transport) debug_printf(" SMTP>>QUIT\n");
6093 /* A TLS conn could be open for a cutthrough, but not for a plain continued-
6095 /*XXX doublecheck that! */
6097 if (cutthrough.cctx.sock >= 0 && cutthrough.is_tls)
6099 (void) tls_write(cutthrough.cctx.tls_ctx, US"QUIT\r\n", 6, FALSE);
6100 tls_close(cutthrough.cctx.tls_ctx, TLS_SHUTDOWN_NOWAIT);
6101 cutthrough.cctx.tls_ctx = NULL;
6102 cutthrough.is_tls = FALSE;
6106 (void) write(fd, US"QUIT\r\n", 6);
6109 DEBUG(D_transport) debug_printf(" SMTP(close)>>\n");
6111 cutthrough.cctx.sock = -1;
6112 continue_hostname = NULL;
6113 continue_sequence = 1;
6114 goto retry_non_continued;
6117 /* This is the end of the loop that repeats iff expired is TRUE and
6118 ob->delay_after_cutoff is FALSE. The second time round we will
6119 try those hosts that haven't been tried since the message arrived. */
6123 debug_printf("all IP addresses skipped or deferred at least one address\n");
6124 if (expired && !ob->delay_after_cutoff && cutoff_retry == 0)
6125 debug_printf("retrying IP addresses not tried since message arrived\n");
6130 /* Get here if all IP addresses are skipped or defer at least one address. In
6131 MUA wrapper mode, this will happen only for connection or other non-message-
6132 specific failures. Force the delivery status for all addresses to FAIL. */
6136 for (address_item * addr = addrlist; addr; addr = addr->next)
6137 addr->transport_return = FAIL;
6141 /* In the normal, non-wrapper case, add a standard message to each deferred
6142 address if there hasn't been an error, that is, if it hasn't actually been
6143 tried this time. The variable "expired" will be FALSE if any deliveries were
6144 actually tried, or if there was at least one host that was not expired. That
6145 is, it is TRUE only if no deliveries were tried and all hosts were expired. If
6146 a delivery has been tried, an error code will be set, and the failing of the
6147 message is handled by the retry code later.
6149 If queue_smtp is set, or this transport was called to send a subsequent message
6150 down an existing TCP/IP connection, and something caused the host not to be
6151 found, we end up here, but can detect these cases and handle them specially. */
6153 for (address_item * addr = addrlist; addr; addr = addr->next)
6155 /* If host is not NULL, it means that we stopped processing the host list
6156 because of hosts_max_try or hosts_max_try_hardlimit. In the former case, this
6157 means we need to behave as if some hosts were skipped because their retry
6158 time had not come. Specifically, this prevents the address from timing out.
6159 However, if we have hit hosts_max_try_hardlimit, we want to behave as if all
6160 hosts were tried. */
6163 if (total_hosts_tried >= ob->hosts_max_try_hardlimit)
6166 debug_printf("hosts_max_try_hardlimit reached: behave as if all "
6167 "hosts were tried\n");
6172 debug_printf("hosts_max_try limit caused some hosts to be skipped\n");
6173 setflag(addr, af_retry_skipped);
6176 if (f.queue_smtp) /* no deliveries attempted */
6178 addr->transport_return = DEFER;
6179 addr->basic_errno = 0;
6180 addr->message = US"SMTP delivery explicitly queued";
6183 else if ( addr->transport_return == DEFER
6184 && (addr->basic_errno == ERRNO_UNKNOWNERROR || addr->basic_errno == 0)
6188 addr->basic_errno = ERRNO_HRETRY;
6189 if (continue_hostname)
6190 addr->message = US"no host found for existing SMTP connection";
6193 setflag(addr, af_pass_message); /* This is not a security risk */
6194 addr->message = string_sprintf(
6195 "all hosts%s have been failing for a long time %s",
6196 addr->domain ? string_sprintf(" for '%s'", addr->domain) : US"",
6197 ob->delay_after_cutoff
6198 ? US"(and retry time not reached)"
6199 : US"and were last tried after this message arrived");
6201 /* If we are already using fallback hosts, or there are no fallback hosts
6202 defined, convert the result to FAIL to cause a bounce. */
6204 if (addr->host_list == addr->fallback_hosts || !addr->fallback_hosts)
6205 addr->transport_return = FAIL;
6210 if (hosts_retry == hosts_total)
6211 s = "retry time not reached for any host%s";
6212 else if (hosts_fail == hosts_total)
6213 s = "all host address lookups%s failed permanently";
6214 else if (hosts_defer == hosts_total)
6215 s = "all host address lookups%s failed temporarily";
6216 else if (hosts_serial == hosts_total)
6217 s = "connection limit reached for all hosts%s";
6218 else if (hosts_fail+hosts_defer == hosts_total)
6219 s = "all host address lookups%s failed";
6221 s = "some host address lookups failed and retry time "
6222 "not reached for other hosts or connection limit reached%s";
6224 addr->message = string_sprintf(s,
6225 addr->domain ? string_sprintf(" for '%s'", addr->domain) : US"");
6230 /* Update the database which keeps information about which messages are waiting
6231 for which hosts to become available. For some message-specific errors, the
6232 update_waiting flag is turned off because we don't want follow-on deliveries in
6233 those cases. If this transport instance is explicitly limited to one message
6234 per connection then follow-on deliveries are not possible and there's no need
6235 to create/update the per-transport wait-<transport_name> database. */
6237 if (update_waiting && tblock->connection_max_messages != 1)
6238 transport_update_waiting(hostlist, trname);
6242 DEBUG(D_transport) debug_printf("Leaving %s transport\n", trname);
6244 return TRUE; /* Each address has its status */
6251 # define smtp_transport_info _transport_info
6254 transport_info smtp_transport_info = {
6256 .driver_name = US"smtp",
6257 .options = smtp_transport_options,
6258 .options_count = &smtp_transport_options_count,
6259 .options_block = &smtp_transport_option_defaults,
6260 .options_len = sizeof(smtp_transport_options_block),
6261 .init = smtp_transport_init,
6263 .dyn_magic = TRANSPORT_MAGIC,
6266 .code = smtp_transport_entry,
6268 .closedown = smtp_transport_closedown,
6272 #endif /*!MACRO_PREDEF*/
6275 /* End of transport/smtp.c */