1 /*************************************************
2 * Exim - an Internet mail transport agent *
3 *************************************************/
5 /* Copyright (c) University of Cambridge 1995 - 2018 */
6 /* See the file NOTICE for conditions of use and distribution. */
12 /* Options specific to the smtp transport. This transport also supports LMTP
13 over TCP/IP. The options must be in alphabetic order (note that "_" comes
14 before the lower case letters). Some live in the transport_instance block so as
15 to be publicly visible; these are flagged with opt_public. */
17 optionlist smtp_transport_options[] = {
18 { "*expand_multi_domain", opt_stringptr | opt_hidden | opt_public,
19 (void *)offsetof(transport_instance, expand_multi_domain) },
20 { "*expand_retry_include_ip_address", opt_stringptr | opt_hidden,
21 (void *)(offsetof(smtp_transport_options_block, expand_retry_include_ip_address)) },
23 { "address_retry_include_sender", opt_bool,
24 (void *)offsetof(smtp_transport_options_block, address_retry_include_sender) },
25 { "allow_localhost", opt_bool,
26 (void *)offsetof(smtp_transport_options_block, allow_localhost) },
27 #ifdef EXPERIMENTAL_ARC
28 { "arc_sign", opt_stringptr,
29 (void *)offsetof(smtp_transport_options_block, arc_sign) },
31 { "authenticated_sender", opt_stringptr,
32 (void *)offsetof(smtp_transport_options_block, authenticated_sender) },
33 { "authenticated_sender_force", opt_bool,
34 (void *)offsetof(smtp_transport_options_block, authenticated_sender_force) },
35 { "command_timeout", opt_time,
36 (void *)offsetof(smtp_transport_options_block, command_timeout) },
37 { "connect_timeout", opt_time,
38 (void *)offsetof(smtp_transport_options_block, connect_timeout) },
39 { "connection_max_messages", opt_int | opt_public,
40 (void *)offsetof(transport_instance, connection_max_messages) },
42 { "dane_require_tls_ciphers", opt_stringptr,
43 (void *)offsetof(smtp_transport_options_block, dane_require_tls_ciphers) },
45 { "data_timeout", opt_time,
46 (void *)offsetof(smtp_transport_options_block, data_timeout) },
47 { "delay_after_cutoff", opt_bool,
48 (void *)offsetof(smtp_transport_options_block, delay_after_cutoff) },
50 { "dkim_canon", opt_stringptr,
51 (void *)offsetof(smtp_transport_options_block, dkim.dkim_canon) },
52 { "dkim_domain", opt_stringptr,
53 (void *)offsetof(smtp_transport_options_block, dkim.dkim_domain) },
54 { "dkim_hash", opt_stringptr,
55 (void *)offsetof(smtp_transport_options_block, dkim.dkim_hash) },
56 { "dkim_identity", opt_stringptr,
57 (void *)offsetof(smtp_transport_options_block, dkim.dkim_identity) },
58 { "dkim_private_key", opt_stringptr,
59 (void *)offsetof(smtp_transport_options_block, dkim.dkim_private_key) },
60 { "dkim_selector", opt_stringptr,
61 (void *)offsetof(smtp_transport_options_block, dkim.dkim_selector) },
62 { "dkim_sign_headers", opt_stringptr,
63 (void *)offsetof(smtp_transport_options_block, dkim.dkim_sign_headers) },
64 { "dkim_strict", opt_stringptr,
65 (void *)offsetof(smtp_transport_options_block, dkim.dkim_strict) },
66 { "dkim_timestamps", opt_stringptr,
67 (void *)offsetof(smtp_transport_options_block, dkim.dkim_timestamps) },
69 { "dns_qualify_single", opt_bool,
70 (void *)offsetof(smtp_transport_options_block, dns_qualify_single) },
71 { "dns_search_parents", opt_bool,
72 (void *)offsetof(smtp_transport_options_block, dns_search_parents) },
73 { "dnssec_request_domains", opt_stringptr,
74 (void *)offsetof(smtp_transport_options_block, dnssec.request) },
75 { "dnssec_require_domains", opt_stringptr,
76 (void *)offsetof(smtp_transport_options_block, dnssec.require) },
77 { "dscp", opt_stringptr,
78 (void *)offsetof(smtp_transport_options_block, dscp) },
79 { "fallback_hosts", opt_stringptr,
80 (void *)offsetof(smtp_transport_options_block, fallback_hosts) },
81 { "final_timeout", opt_time,
82 (void *)offsetof(smtp_transport_options_block, final_timeout) },
83 { "gethostbyname", opt_bool,
84 (void *)offsetof(smtp_transport_options_block, gethostbyname) },
85 { "helo_data", opt_stringptr,
86 (void *)offsetof(smtp_transport_options_block, helo_data) },
87 { "hosts", opt_stringptr,
88 (void *)offsetof(smtp_transport_options_block, hosts) },
89 { "hosts_avoid_esmtp", opt_stringptr,
90 (void *)offsetof(smtp_transport_options_block, hosts_avoid_esmtp) },
91 { "hosts_avoid_pipelining", opt_stringptr,
92 (void *)offsetof(smtp_transport_options_block, hosts_avoid_pipelining) },
94 { "hosts_avoid_tls", opt_stringptr,
95 (void *)offsetof(smtp_transport_options_block, hosts_avoid_tls) },
97 { "hosts_max_try", opt_int,
98 (void *)offsetof(smtp_transport_options_block, hosts_max_try) },
99 { "hosts_max_try_hardlimit", opt_int,
100 (void *)offsetof(smtp_transport_options_block, hosts_max_try_hardlimit) },
102 { "hosts_nopass_tls", opt_stringptr,
103 (void *)offsetof(smtp_transport_options_block, hosts_nopass_tls) },
104 { "hosts_noproxy_tls", opt_stringptr,
105 (void *)offsetof(smtp_transport_options_block, hosts_noproxy_tls) },
107 { "hosts_override", opt_bool,
108 (void *)offsetof(smtp_transport_options_block, hosts_override) },
109 #ifdef SUPPORT_PIPE_CONNECT
110 { "hosts_pipe_connect", opt_stringptr,
111 (void *)offsetof(smtp_transport_options_block, hosts_pipe_connect) },
113 { "hosts_randomize", opt_bool,
114 (void *)offsetof(smtp_transport_options_block, hosts_randomize) },
115 #if !defined(DISABLE_TLS) && !defined(DISABLE_OCSP)
116 { "hosts_request_ocsp", opt_stringptr,
117 (void *)offsetof(smtp_transport_options_block, hosts_request_ocsp) },
119 { "hosts_require_auth", opt_stringptr,
120 (void *)offsetof(smtp_transport_options_block, hosts_require_auth) },
123 { "hosts_require_dane", opt_stringptr,
124 (void *)offsetof(smtp_transport_options_block, hosts_require_dane) },
126 # ifndef DISABLE_OCSP
127 { "hosts_require_ocsp", opt_stringptr,
128 (void *)offsetof(smtp_transport_options_block, hosts_require_ocsp) },
130 { "hosts_require_tls", opt_stringptr,
131 (void *)offsetof(smtp_transport_options_block, hosts_require_tls) },
133 { "hosts_try_auth", opt_stringptr,
134 (void *)offsetof(smtp_transport_options_block, hosts_try_auth) },
135 { "hosts_try_chunking", opt_stringptr,
136 (void *)offsetof(smtp_transport_options_block, hosts_try_chunking) },
138 { "hosts_try_dane", opt_stringptr,
139 (void *)offsetof(smtp_transport_options_block, hosts_try_dane) },
141 { "hosts_try_fastopen", opt_stringptr,
142 (void *)offsetof(smtp_transport_options_block, hosts_try_fastopen) },
144 { "hosts_try_prdr", opt_stringptr,
145 (void *)offsetof(smtp_transport_options_block, hosts_try_prdr) },
148 { "hosts_verify_avoid_tls", opt_stringptr,
149 (void *)offsetof(smtp_transport_options_block, hosts_verify_avoid_tls) },
151 { "interface", opt_stringptr,
152 (void *)offsetof(smtp_transport_options_block, interface) },
153 { "keepalive", opt_bool,
154 (void *)offsetof(smtp_transport_options_block, keepalive) },
155 { "lmtp_ignore_quota", opt_bool,
156 (void *)offsetof(smtp_transport_options_block, lmtp_ignore_quota) },
157 { "max_rcpt", opt_int | opt_public,
158 (void *)offsetof(transport_instance, max_addresses) },
159 { "multi_domain", opt_expand_bool | opt_public,
160 (void *)offsetof(transport_instance, multi_domain) },
161 { "port", opt_stringptr,
162 (void *)offsetof(smtp_transport_options_block, port) },
163 { "protocol", opt_stringptr,
164 (void *)offsetof(smtp_transport_options_block, protocol) },
165 { "retry_include_ip_address", opt_expand_bool,
166 (void *)offsetof(smtp_transport_options_block, retry_include_ip_address) },
167 { "serialize_hosts", opt_stringptr,
168 (void *)offsetof(smtp_transport_options_block, serialize_hosts) },
169 { "size_addition", opt_int,
170 (void *)offsetof(smtp_transport_options_block, size_addition) },
172 { "socks_proxy", opt_stringptr,
173 (void *)offsetof(smtp_transport_options_block, socks_proxy) },
176 { "tls_certificate", opt_stringptr,
177 (void *)offsetof(smtp_transport_options_block, tls_certificate) },
178 { "tls_crl", opt_stringptr,
179 (void *)offsetof(smtp_transport_options_block, tls_crl) },
180 { "tls_dh_min_bits", opt_int,
181 (void *)offsetof(smtp_transport_options_block, tls_dh_min_bits) },
182 { "tls_privatekey", opt_stringptr,
183 (void *)offsetof(smtp_transport_options_block, tls_privatekey) },
184 { "tls_require_ciphers", opt_stringptr,
185 (void *)offsetof(smtp_transport_options_block, tls_require_ciphers) },
186 # ifdef EXPERIMENTAL_TLS_RESUME
187 { "tls_resumption_hosts", opt_stringptr,
188 (void *)offsetof(smtp_transport_options_block, tls_resumption_hosts) },
190 { "tls_sni", opt_stringptr,
191 (void *)offsetof(smtp_transport_options_block, tls_sni) },
192 { "tls_tempfail_tryclear", opt_bool,
193 (void *)offsetof(smtp_transport_options_block, tls_tempfail_tryclear) },
194 { "tls_try_verify_hosts", opt_stringptr,
195 (void *)offsetof(smtp_transport_options_block, tls_try_verify_hosts) },
196 { "tls_verify_cert_hostnames", opt_stringptr,
197 (void *)offsetof(smtp_transport_options_block,tls_verify_cert_hostnames)},
198 { "tls_verify_certificates", opt_stringptr,
199 (void *)offsetof(smtp_transport_options_block, tls_verify_certificates) },
200 { "tls_verify_hosts", opt_stringptr,
201 (void *)offsetof(smtp_transport_options_block, tls_verify_hosts) },
204 { "utf8_downconvert", opt_stringptr,
205 (void *)offsetof(smtp_transport_options_block, utf8_downconvert) },
209 /* Size of the options list. An extern variable has to be used so that its
210 address can appear in the tables drtables.c. */
212 int smtp_transport_options_count = nelem(smtp_transport_options);
218 smtp_transport_options_block smtp_transport_option_defaults = {0};
219 void smtp_transport_init(transport_instance *tblock) {}
220 BOOL smtp_transport_entry(transport_instance *tblock, address_item *addr) {return FALSE;}
221 void smtp_transport_closedown(transport_instance *tblock) {}
223 #else /*!MACRO_PREDEF*/
226 /* Default private options block for the smtp transport. */
228 smtp_transport_options_block smtp_transport_option_defaults = {
230 .fallback_hosts = NULL,
232 .fallback_hostlist = NULL,
233 .helo_data = US"$primary_hostname",
236 .protocol = US"smtp",
238 .serialize_hosts = NULL,
239 .hosts_try_auth = NULL,
240 .hosts_require_auth = NULL,
241 .hosts_try_chunking = US"*",
243 .hosts_try_dane = US"*",
244 .hosts_require_dane = NULL,
245 .dane_require_tls_ciphers = NULL,
247 .hosts_try_fastopen = US"*",
249 .hosts_try_prdr = US"*",
252 .hosts_request_ocsp = US"*", /* hosts_request_ocsp (except under DANE; tls_client_start()) */
253 .hosts_require_ocsp = NULL,
255 .hosts_require_tls = NULL,
256 .hosts_avoid_tls = NULL,
257 .hosts_verify_avoid_tls = NULL,
258 .hosts_avoid_pipelining = NULL,
259 #ifdef SUPPORT_PIPE_CONNECT
260 .hosts_pipe_connect = NULL,
262 .hosts_avoid_esmtp = NULL,
264 .hosts_nopass_tls = NULL,
265 .hosts_noproxy_tls = NULL,
267 .command_timeout = 5*60,
268 .connect_timeout = 5*60,
269 .data_timeout = 5*60,
270 .final_timeout = 10*60,
271 .size_addition = 1024,
273 .hosts_max_try_hardlimit = 50,
274 .address_retry_include_sender = TRUE,
275 .allow_localhost = FALSE,
276 .authenticated_sender_force = FALSE,
277 .gethostbyname = FALSE,
278 .dns_qualify_single = TRUE,
279 .dns_search_parents = FALSE,
280 .dnssec = { .request=NULL, .require=NULL },
281 .delay_after_cutoff = TRUE,
282 .hosts_override = FALSE,
283 .hosts_randomize = FALSE,
285 .lmtp_ignore_quota = FALSE,
286 .expand_retry_include_ip_address = NULL,
287 .retry_include_ip_address = TRUE,
292 .tls_certificate = NULL,
294 .tls_privatekey = NULL,
295 .tls_require_ciphers = NULL,
297 .tls_verify_certificates = US"system",
298 .tls_dh_min_bits = EXIM_CLIENT_DH_DEFAULT_MIN_BITS,
299 .tls_tempfail_tryclear = TRUE,
300 # ifdef EXPERIMENTAL_TLS_RESUME
301 .tls_resumption_hosts = NULL,
303 .tls_verify_hosts = NULL,
304 .tls_try_verify_hosts = US"*",
305 .tls_verify_cert_hostnames = US"*",
308 .utf8_downconvert = NULL,
312 {.dkim_domain = NULL,
313 .dkim_identity = NULL,
314 .dkim_private_key = NULL,
315 .dkim_selector = NULL,
317 .dkim_sign_headers = NULL,
319 .dkim_hash = US"sha256",
320 .dkim_timestamps = NULL,
321 .dot_stuffed = FALSE,
322 .force_bodyhash = FALSE,
323 # ifdef EXPERIMENTAL_ARC
324 .arc_signspec = NULL,
327 # ifdef EXPERIMENTAL_ARC
333 /* some DSN flags for use later */
335 static int rf_list[] = {rf_notify_never, rf_notify_success,
336 rf_notify_failure, rf_notify_delay };
338 static uschar *rf_names[] = { US"NEVER", US"SUCCESS", US"FAILURE", US"DELAY" };
344 static uschar *smtp_command; /* Points to last cmd for error messages */
345 static uschar *mail_command; /* Points to MAIL cmd for error messages */
346 static uschar *data_command = US""; /* Points to DATA cmd for error messages */
347 static BOOL update_waiting; /* TRUE to update the "wait" database */
349 /*XXX move to smtp_context */
350 static BOOL pipelining_active; /* current transaction is in pipe mode */
353 static unsigned ehlo_response(uschar * buf, unsigned checks);
356 /*************************************************
357 * Setup entry point *
358 *************************************************/
360 /* This function is called when the transport is about to be used,
361 but before running it in a sub-process. It is used for two things:
363 (1) To set the fallback host list in addresses, when delivering.
364 (2) To pass back the interface, port, protocol, and other options, for use
365 during callout verification.
368 tblock pointer to the transport instance block
369 addrlist list of addresses about to be transported
370 tf if not NULL, pointer to block in which to return options
371 uid the uid that will be set (not used)
372 gid the gid that will be set (not used)
373 errmsg place for error message (not used)
375 Returns: OK always (FAIL, DEFER not used)
379 smtp_transport_setup(transport_instance *tblock, address_item *addrlist,
380 transport_feedback *tf, uid_t uid, gid_t gid, uschar **errmsg)
382 smtp_transport_options_block *ob = SOB tblock->options_block;
384 errmsg = errmsg; /* Keep picky compilers happy */
388 /* Pass back options if required. This interface is getting very messy. */
392 tf->interface = ob->interface;
394 tf->protocol = ob->protocol;
395 tf->hosts = ob->hosts;
396 tf->hosts_override = ob->hosts_override;
397 tf->hosts_randomize = ob->hosts_randomize;
398 tf->gethostbyname = ob->gethostbyname;
399 tf->qualify_single = ob->dns_qualify_single;
400 tf->search_parents = ob->dns_search_parents;
401 tf->helo_data = ob->helo_data;
404 /* Set the fallback host list for all the addresses that don't have fallback
405 host lists, provided that the local host wasn't present in the original host
408 if (!testflag(addrlist, af_local_host_removed))
409 for (; addrlist; addrlist = addrlist->next)
410 if (!addrlist->fallback_hosts) addrlist->fallback_hosts = ob->fallback_hostlist;
417 /*************************************************
418 * Initialization entry point *
419 *************************************************/
421 /* Called for each instance, after its options have been read, to
422 enable consistency checks to be done, or anything else that needs
425 Argument: pointer to the transport instance block
430 smtp_transport_init(transport_instance *tblock)
432 smtp_transport_options_block *ob = SOB tblock->options_block;
434 /* Retry_use_local_part defaults FALSE if unset */
436 if (tblock->retry_use_local_part == TRUE_UNSET)
437 tblock->retry_use_local_part = FALSE;
439 /* Set the default port according to the protocol */
442 ob->port = strcmpic(ob->protocol, US"lmtp") == 0
444 : strcmpic(ob->protocol, US"smtps") == 0
445 ? US"smtps" : US"smtp";
447 /* Set up the setup entry point, to be called before subprocesses for this
450 tblock->setup = smtp_transport_setup;
452 /* Complain if any of the timeouts are zero. */
454 if (ob->command_timeout <= 0 || ob->data_timeout <= 0 ||
455 ob->final_timeout <= 0)
456 log_write(0, LOG_PANIC_DIE|LOG_CONFIG,
457 "command, data, or final timeout value is zero for %s transport",
460 /* If hosts_override is set and there are local hosts, set the global
461 flag that stops verify from showing router hosts. */
463 if (ob->hosts_override && ob->hosts != NULL) tblock->overrides_hosts = TRUE;
465 /* If there are any fallback hosts listed, build a chain of host items
466 for them, but do not do any lookups at this time. */
468 host_build_hostlist(&(ob->fallback_hostlist), ob->fallback_hosts, FALSE);
475 /*************************************************
476 * Set delivery info into all active addresses *
477 *************************************************/
479 /* Only addresses whose status is >= PENDING are relevant. A lesser
480 status means that an address is not currently being processed.
483 addrlist points to a chain of addresses
484 errno_value to put in each address's errno field
485 msg to put in each address's message field
486 rc to put in each address's transport_return field
487 pass_message if TRUE, set the "pass message" flag in the address
488 host if set, mark addrs as having used this host
489 smtp_greeting from peer
490 helo_response from peer
492 If errno_value has the special value ERRNO_CONNECTTIMEOUT, ETIMEDOUT is put in
493 the errno field, and RTEF_CTOUT is ORed into the more_errno field, to indicate
494 this particular type of timeout.
500 set_errno(address_item *addrlist, int errno_value, uschar *msg, int rc,
501 BOOL pass_message, host_item * host
502 #ifdef EXPERIMENTAL_DSN_INFO
503 , const uschar * smtp_greeting, const uschar * helo_response
508 if (errno_value == ERRNO_CONNECTTIMEOUT)
510 errno_value = ETIMEDOUT;
511 orvalue = RTEF_CTOUT;
513 for (address_item * addr = addrlist; addr; addr = addr->next)
514 if (addr->transport_return >= PENDING)
516 addr->basic_errno = errno_value;
517 addr->more_errno |= orvalue;
521 if (pass_message) setflag(addr, af_pass_message);
523 addr->transport_return = rc;
526 addr->host_used = host;
527 #ifdef EXPERIMENTAL_DSN_INFO
529 {uschar * s = Ustrchr(smtp_greeting, '\n'); if (s) *s = '\0';}
530 addr->smtp_greeting = smtp_greeting;
533 {uschar * s = Ustrchr(helo_response, '\n'); if (s) *s = '\0';}
534 addr->helo_response = helo_response;
541 set_errno_nohost(address_item *addrlist, int errno_value, uschar *msg, int rc,
544 set_errno(addrlist, errno_value, msg, rc, pass_message, NULL
545 #ifdef EXPERIMENTAL_DSN_INFO
552 /*************************************************
553 * Check an SMTP response *
554 *************************************************/
556 /* This function is given an errno code and the SMTP response buffer
557 to analyse, together with the host identification for generating messages. It
558 sets an appropriate message and puts the first digit of the response code into
559 the yield variable. If no response was actually read, a suitable digit is
563 host the current host, to get its name for messages
564 errno_value pointer to the errno value
565 more_errno from the top address for use with ERRNO_FILTER_FAIL
566 buffer the SMTP response buffer
567 yield where to put a one-digit SMTP response code
568 message where to put an error message
569 pass_message set TRUE if message is an SMTP response
571 Returns: TRUE if an SMTP "QUIT" command should be sent, else FALSE
575 check_response(host_item *host, int *errno_value, int more_errno,
576 uschar *buffer, int *yield, uschar **message, BOOL *pass_message)
578 uschar * pl = pipelining_active ? US"pipelined " : US"";
581 *yield = '4'; /* Default setting is to give a temporary error */
585 case ETIMEDOUT: /* Handle response timeout */
586 *message = US string_sprintf("SMTP timeout after %s%s",
588 if (transport_count > 0)
589 *message = US string_sprintf("%s (%d bytes written)", *message,
593 case ERRNO_SMTPFORMAT: /* Handle malformed SMTP response */
594 s = string_printing(buffer);
595 while (isspace(*s)) s++;
597 ? string_sprintf("Malformed SMTP reply (an empty line) "
598 "in response to %s%s", pl, smtp_command)
599 : string_sprintf("Malformed SMTP reply in response to %s%s: %s",
600 pl, smtp_command, s);
603 case ERRNO_TLSFAILURE: /* Handle bad first read; can happen with
605 *message = US"bad first read from TLS conn";
608 case ERRNO_FILTER_FAIL: /* Handle a failed filter process error;
609 can't send QUIT as we mustn't end the DATA. */
610 *message = string_sprintf("transport filter process failed (%d)%s",
612 more_errno == EX_EXECFAILED ? ": unable to execute command" : "");
615 case ERRNO_CHHEADER_FAIL: /* Handle a failed add_headers expansion;
616 can't send QUIT as we mustn't end the DATA. */
618 string_sprintf("failed to expand headers_add or headers_remove: %s",
619 expand_string_message);
622 case ERRNO_WRITEINCOMPLETE: /* failure to write a complete data block */
623 *message = US"failed to write a data block";
627 case ERRNO_UTF8_FWD: /* no advertised SMTPUTF8, for international message */
628 *message = US"utf8 support required but not offered for forwarding";
629 DEBUG(D_deliver|D_transport) debug_printf("%s\n", *message);
634 /* Handle error responses from the remote mailer. */
638 *message = string_sprintf("SMTP error from remote mail server after %s%s: "
639 "%s", pl, smtp_command, s = string_printing(buffer));
640 *pass_message = TRUE;
645 /* No data was read. If there is no errno, this must be the EOF (i.e.
646 connection closed) case, which causes deferral. An explicit connection reset
647 error has the same effect. Otherwise, put the host's identity in the message,
648 leaving the errno value to be interpreted as well. In all cases, we have to
649 assume the connection is now dead. */
651 if (*errno_value == 0 || *errno_value == ECONNRESET)
653 *errno_value = ERRNO_SMTPCLOSED;
654 *message = US string_sprintf("Remote host closed connection "
655 "in response to %s%s", pl, smtp_command);
658 *message = US string_sprintf("%s [%s]", host->name, host->address);
665 /*************************************************
666 * Write error message to logs *
667 *************************************************/
669 /* This writes to the main log and to the message log.
672 host the current host
673 detail the current message (addr_item->message)
674 basic_errno the errno (addr_item->basic_errno)
680 write_logs(const host_item *host, const uschar *suffix, int basic_errno)
682 gstring * message = LOGGING(outgoing_port)
683 ? string_fmt_append(NULL, "H=%s [%s]:%d", host->name, host->address,
684 host->port == PORT_NONE ? 25 : host->port)
685 : string_fmt_append(NULL, "H=%s [%s]", host->name, host->address);
689 message = string_fmt_append(message, ": %s", suffix);
691 message = string_fmt_append(message, ": %s", strerror(basic_errno));
694 message = string_fmt_append(message, " %s", exim_errstr(basic_errno));
696 log_write(0, LOG_MAIN, "%s", string_from_gstring(message));
697 deliver_msglog("%s %s\n", tod_stamp(tod_log), message->s);
701 msglog_line(host_item * host, uschar * message)
703 deliver_msglog("%s H=%s [%s] %s\n", tod_stamp(tod_log),
704 host->name, host->address, message);
709 #ifndef DISABLE_EVENT
710 /*************************************************
711 * Post-defer action *
712 *************************************************/
714 /* This expands an arbitrary per-transport string.
715 It might, for example, be used to write to the database log.
718 addr the address item containing error information
719 host the current host
725 deferred_event_raise(address_item *addr, host_item *host)
727 uschar * action = addr->transport->event_action;
728 const uschar * save_domain;
734 save_domain = deliver_domain;
735 save_local = deliver_localpart;
737 /*XXX would ip & port already be set up? */
738 deliver_host_address = string_copy(host->address);
739 deliver_host_port = host->port == PORT_NONE ? 25 : host->port;
740 event_defer_errno = addr->basic_errno;
742 router_name = addr->router->name;
743 transport_name = addr->transport->name;
744 deliver_domain = addr->domain;
745 deliver_localpart = addr->local_part;
747 (void) event_raise(action, US"msg:host:defer",
749 ? addr->basic_errno > 0
750 ? string_sprintf("%s: %s", addr->message, strerror(addr->basic_errno))
751 : string_copy(addr->message)
752 : addr->basic_errno > 0
753 ? string_copy(US strerror(addr->basic_errno))
756 deliver_localpart = save_local;
757 deliver_domain = save_domain;
758 router_name = transport_name = NULL;
762 /*************************************************
763 * Reap SMTP specific responses *
764 *************************************************/
766 smtp_discard_responses(smtp_context * sx, smtp_transport_options_block * ob,
769 uschar flushbuffer[4096];
773 if (!smtp_read_response(sx, flushbuffer, sizeof(flushbuffer),
774 '2', ob->command_timeout)
775 && (errno != 0 || flushbuffer[0] == 0))
782 /* Return boolean success */
785 smtp_reap_banner(smtp_context * sx)
787 BOOL good_response = smtp_read_response(sx, sx->buffer, sizeof(sx->buffer),
788 '2', (SOB sx->conn_args.ob)->command_timeout);
789 #ifdef EXPERIMENTAL_DSN_INFO
790 sx->smtp_greeting = string_copy(sx->buffer);
792 return good_response;
796 smtp_reap_ehlo(smtp_context * sx)
798 if (!smtp_read_response(sx, sx->buffer, sizeof(sx->buffer), '2',
799 (SOB sx->conn_args.ob)->command_timeout))
801 if (errno != 0 || sx->buffer[0] == 0 || sx->lmtp)
803 #ifdef EXPERIMENTAL_DSN_INFO
804 sx->helo_response = string_copy(sx->buffer);
810 #ifdef EXPERIMENTAL_DSN_INFO
811 sx->helo_response = string_copy(sx->buffer);
818 #ifdef SUPPORT_PIPE_CONNECT
820 ehlo_cache_key(const smtp_context * sx)
822 host_item * host = sx->conn_args.host;
823 return Ustrchr(host->address, ':')
824 ? string_sprintf("[%s]:%d.EHLO", host->address,
825 host->port == PORT_NONE ? sx->port : host->port)
826 : string_sprintf("%s:%d.EHLO", host->address,
827 host->port == PORT_NONE ? sx->port : host->port);
831 write_ehlo_cache_entry(const smtp_context * sx)
833 open_db dbblock, * dbm_file;
835 if ((dbm_file = dbfn_open(US"misc", O_RDWR, &dbblock, TRUE, TRUE)))
837 uschar * ehlo_resp_key = ehlo_cache_key(sx);
838 dbdata_ehlo_resp er = { .data = sx->ehlo_resp };
840 HDEBUG(D_transport) debug_printf("writing clr %04x/%04x cry %04x/%04x\n",
841 sx->ehlo_resp.cleartext_features, sx->ehlo_resp.cleartext_auths,
842 sx->ehlo_resp.crypted_features, sx->ehlo_resp.crypted_auths);
844 dbfn_write(dbm_file, ehlo_resp_key, &er, (int)sizeof(er));
845 dbfn_close(dbm_file);
850 invalidate_ehlo_cache_entry(smtp_context * sx)
852 open_db dbblock, * dbm_file;
854 if ( sx->early_pipe_active
855 && (dbm_file = dbfn_open(US"misc", O_RDWR, &dbblock, TRUE, TRUE)))
857 uschar * ehlo_resp_key = ehlo_cache_key(sx);
858 dbfn_delete(dbm_file, ehlo_resp_key);
859 dbfn_close(dbm_file);
864 read_ehlo_cache_entry(smtp_context * sx)
869 if (!(dbm_file = dbfn_open(US"misc", O_RDONLY, &dbblock, FALSE, TRUE)))
870 { DEBUG(D_transport) debug_printf("ehlo-cache: no misc DB\n"); }
873 uschar * ehlo_resp_key = ehlo_cache_key(sx);
874 dbdata_ehlo_resp * er;
876 if (!(er = dbfn_read(dbm_file, ehlo_resp_key)))
877 { DEBUG(D_transport) debug_printf("no ehlo-resp record\n"); }
878 else if (time(NULL) - er->time_stamp > retry_data_expire)
880 DEBUG(D_transport) debug_printf("ehlo-resp record too old\n");
881 dbfn_close(dbm_file);
882 if ((dbm_file = dbfn_open(US"misc", O_RDWR, &dbblock, TRUE, TRUE)))
883 dbfn_delete(dbm_file, ehlo_resp_key);
887 sx->ehlo_resp = er->data;
888 dbfn_close(dbm_file);
889 DEBUG(D_transport) debug_printf(
890 "EHLO response bits from cache: cleartext 0x%04x crypted 0x%04x\n",
891 er->data.cleartext_features, er->data.crypted_features);
894 dbfn_close(dbm_file);
901 /* Return an auths bitmap for the set of AUTH methods offered by the server
902 which match our authenticators. */
904 static unsigned short
905 study_ehlo_auths(smtp_context * sx)
910 unsigned short authbits = 0;
912 if (!sx->esmtp) return 0;
913 if (!regex_AUTH) regex_AUTH = regex_must_compile(AUTHS_REGEX, FALSE, TRUE);
914 if (!regex_match_and_setup(regex_AUTH, sx->buffer, 0, -1)) return 0;
915 expand_nmax = -1; /* reset */
916 names = string_copyn(expand_nstring[1], expand_nlength[1]);
918 for (au = auths, authnum = 0; au; au = au->next, authnum++) if (au->client)
920 const uschar * list = names;
924 while (string_nextinlist(&list, &sep, name, sizeof(name)))
925 if (strcmpic(au->public_name, name) == 0)
926 { authbits |= BIT(authnum); break; }
930 debug_printf("server offers %s AUTH, methods '%s', bitmap 0x%04x\n",
931 tls_out.active.sock >= 0 ? "crypted" : "plaintext", names, authbits);
933 if (tls_out.active.sock >= 0)
934 sx->ehlo_resp.crypted_auths = authbits;
936 sx->ehlo_resp.cleartext_auths = authbits;
943 /* Wait for and check responses for early-pipelining.
945 Called from the lower-level smtp_read_response() function
946 used for general code that assume synchronisation, if context
947 flags indicate outstanding early-pipelining commands. Also
948 called fom sync_responses() which handles pipelined commands.
951 sx smtp connection context
952 countp number of outstanding responses, adjusted on return
956 DEFER error on first read of TLS'd conn
957 FAIL SMTP error in response
960 smtp_reap_early_pipe(smtp_context * sx, int * countp)
962 BOOL pending_BANNER = sx->pending_BANNER;
963 BOOL pending_EHLO = sx->pending_EHLO;
966 sx->pending_BANNER = FALSE; /* clear early to avoid recursion */
967 sx->pending_EHLO = FALSE;
971 DEBUG(D_transport) debug_printf("%s expect banner\n", __FUNCTION__);
973 if (!smtp_reap_banner(sx))
975 DEBUG(D_transport) debug_printf("bad banner\n");
976 if (tls_out.active.sock >= 0) rc = DEFER;
983 unsigned peer_offered;
984 unsigned short authbits = 0, * ap;
986 DEBUG(D_transport) debug_printf("%s expect ehlo\n", __FUNCTION__);
988 if (!smtp_reap_ehlo(sx))
990 DEBUG(D_transport) debug_printf("bad response for EHLO\n");
991 if (tls_out.active.sock >= 0) rc = DEFER;
995 /* Compare the actual EHLO response to the cached value we assumed;
996 on difference, dump or rewrite the cache and arrange for a retry. */
998 ap = tls_out.active.sock < 0
999 ? &sx->ehlo_resp.cleartext_auths : &sx->ehlo_resp.crypted_auths;
1001 peer_offered = ehlo_response(sx->buffer,
1002 (tls_out.active.sock < 0 ? OPTION_TLS : 0)
1003 | OPTION_CHUNKING | OPTION_PRDR | OPTION_DSN | OPTION_PIPE | OPTION_SIZE
1004 | OPTION_UTF8 | OPTION_EARLY_PIPE
1006 if ( peer_offered != sx->peer_offered
1007 || (authbits = study_ehlo_auths(sx)) != *ap)
1010 debug_printf("EHLO %s extensions changed, 0x%04x/0x%04x -> 0x%04x/0x%04x\n",
1011 tls_out.active.sock < 0 ? "cleartext" : "crypted",
1012 sx->peer_offered, *ap, peer_offered, authbits);
1013 *(tls_out.active.sock < 0
1014 ? &sx->ehlo_resp.cleartext_features : &sx->ehlo_resp.crypted_features) = peer_offered;
1016 if (peer_offered & OPTION_EARLY_PIPE)
1017 write_ehlo_cache_entry(sx);
1019 invalidate_ehlo_cache_entry(sx);
1021 return OK; /* just carry on */
1027 invalidate_ehlo_cache_entry(sx);
1028 (void) smtp_discard_responses(sx, sx->conn_args.ob, *countp);
1034 /*************************************************
1035 * Synchronize SMTP responses *
1036 *************************************************/
1038 /* This function is called from smtp_deliver() to receive SMTP responses from
1039 the server, and match them up with the commands to which they relate. When
1040 PIPELINING is not in use, this function is called after every command, and is
1041 therefore somewhat over-engineered, but it is simpler to use a single scheme
1042 that works both with and without PIPELINING instead of having two separate sets
1045 The set of commands that are buffered up with pipelining may start with MAIL
1046 and may end with DATA; in between are RCPT commands that correspond to the
1047 addresses whose status is PENDING_DEFER. All other commands (STARTTLS, AUTH,
1048 etc.) are never buffered.
1050 Errors after MAIL or DATA abort the whole process leaving the response in the
1051 buffer. After MAIL, pending responses are flushed, and the original command is
1052 re-instated in big_buffer for error messages. For RCPT commands, the remote is
1053 permitted to reject some recipient addresses while accepting others. However
1054 certain errors clearly abort the whole process. Set the value in
1055 transport_return to PENDING_OK if the address is accepted. If there is a
1056 subsequent general error, it will get reset accordingly. If not, it will get
1057 converted to OK at the end.
1060 sx smtp connection context
1061 count the number of responses to read
1062 pending_DATA 0 if last command sent was not DATA
1063 +1 if previously had a good recipient
1064 -1 if not previously had a good recipient
1066 Returns: 3 if at least one address had 2xx and one had 5xx
1067 2 if at least one address had 5xx but none had 2xx
1068 1 if at least one host had a 2xx response, but none had 5xx
1069 0 no address had 2xx or 5xx but no errors (all 4xx, or just DATA)
1070 -1 timeout while reading RCPT response
1071 -2 I/O or other non-response error for RCPT
1072 -3 DATA or MAIL failed - errno and buffer set
1073 -4 banner or EHLO failed (early-pipelining)
1074 -5 banner or EHLO failed (early-pipelining, TLS)
1078 sync_responses(smtp_context * sx, int count, int pending_DATA)
1080 address_item * addr = sx->sync_addr;
1081 smtp_transport_options_block * ob = sx->conn_args.ob;
1084 #ifdef SUPPORT_PIPE_CONNECT
1086 if ((rc = smtp_reap_early_pipe(sx, &count)) != OK)
1087 return rc == FAIL ? -4 : -5;
1090 /* Handle the response for a MAIL command. On error, reinstate the original
1091 command in big_buffer for error message use, and flush any further pending
1092 responses before returning, except after I/O errors and timeouts. */
1094 if (sx->pending_MAIL)
1096 DEBUG(D_transport) debug_printf("%s expect mail\n", __FUNCTION__);
1098 if (!smtp_read_response(sx, sx->buffer, sizeof(sx->buffer),
1099 '2', ob->command_timeout))
1101 DEBUG(D_transport) debug_printf("bad response for MAIL\n");
1102 Ustrcpy(big_buffer, mail_command); /* Fits, because it came from there! */
1103 if (errno == ERRNO_TLSFAILURE)
1105 if (errno == 0 && sx->buffer[0] != 0)
1108 if (sx->buffer[0] == '4')
1110 save_errno = ERRNO_MAIL4XX;
1111 addr->more_errno |= ((sx->buffer[1] - '0')*10 + sx->buffer[2] - '0') << 8;
1113 count = smtp_discard_responses(sx, ob, count);
1117 if (pending_DATA) count--; /* Number of RCPT responses to come */
1118 while (count-- > 0) /* Mark any pending addrs with the host used */
1120 while (addr->transport_return != PENDING_DEFER) addr = addr->next;
1121 addr->host_used = sx->conn_args.host;
1128 if (pending_DATA) count--; /* Number of RCPT responses to come */
1130 /* Read and handle the required number of RCPT responses, matching each one up
1131 with an address by scanning for the next address whose status is PENDING_DEFER.
1136 while (addr->transport_return != PENDING_DEFER)
1137 if (!(addr = addr->next))
1140 /* The address was accepted */
1141 addr->host_used = sx->conn_args.host;
1143 DEBUG(D_transport) debug_printf("%s expect rcpt\n", __FUNCTION__);
1144 if (smtp_read_response(sx, sx->buffer, sizeof(sx->buffer),
1145 '2', ob->command_timeout))
1148 addr->transport_return = PENDING_OK;
1150 /* If af_dr_retry_exists is set, there was a routing delay on this address;
1151 ensure that any address-specific retry record is expunged. We do this both
1152 for the basic key and for the version that also includes the sender. */
1154 if (testflag(addr, af_dr_retry_exists))
1156 uschar *altkey = string_sprintf("%s:<%s>", addr->address_retry_key,
1158 retry_add_item(addr, altkey, rf_delete);
1159 retry_add_item(addr, addr->address_retry_key, rf_delete);
1163 /* Error on first TLS read */
1165 else if (errno == ERRNO_TLSFAILURE)
1168 /* Timeout while reading the response */
1170 else if (errno == ETIMEDOUT)
1172 uschar *message = string_sprintf("SMTP timeout after RCPT TO:<%s>",
1173 transport_rcpt_address(addr, sx->conn_args.tblock->rcpt_include_affixes));
1174 set_errno_nohost(sx->first_addr, ETIMEDOUT, message, DEFER, FALSE);
1175 retry_add_item(addr, addr->address_retry_key, 0);
1176 update_waiting = FALSE;
1180 /* Handle other errors in obtaining an SMTP response by returning -1. This
1181 will cause all the addresses to be deferred. Restore the SMTP command in
1182 big_buffer for which we are checking the response, so the error message
1185 else if (errno != 0 || sx->buffer[0] == 0)
1187 gstring gs = { .size = big_buffer_size, .ptr = 0, .s = big_buffer }, * g = &gs;
1189 /* Use taint-unchecked routines for writing into big_buffer, trusting
1190 that we'll never expand it. */
1192 g = string_fmt_append_f(g, SVFMT_TAINT_NOCHK, "RCPT TO:<%s>",
1193 transport_rcpt_address(addr, sx->conn_args.tblock->rcpt_include_affixes));
1194 string_from_gstring(g);
1198 /* Handle SMTP permanent and temporary response codes. */
1203 string_sprintf("SMTP error from remote mail server after RCPT TO:<%s>: "
1204 "%s", transport_rcpt_address(addr, sx->conn_args.tblock->rcpt_include_affixes),
1205 string_printing(sx->buffer));
1206 setflag(addr, af_pass_message);
1208 msglog_line(sx->conn_args.host, addr->message);
1210 /* The response was 5xx */
1212 if (sx->buffer[0] == '5')
1214 addr->transport_return = FAIL;
1218 /* The response was 4xx */
1222 addr->transport_return = DEFER;
1223 addr->basic_errno = ERRNO_RCPT4XX;
1224 addr->more_errno |= ((sx->buffer[1] - '0')*10 + sx->buffer[2] - '0') << 8;
1228 #ifndef DISABLE_EVENT
1229 event_defer_errno = addr->more_errno;
1230 msg_event_raise(US"msg:rcpt:host:defer", addr);
1233 /* Log temporary errors if there are more hosts to be tried.
1234 If not, log this last one in the == line. */
1236 if (sx->conn_args.host->next)
1237 if (LOGGING(outgoing_port))
1238 log_write(0, LOG_MAIN, "H=%s [%s]:%d %s", sx->conn_args.host->name,
1239 sx->conn_args.host->address,
1240 sx->port == PORT_NONE ? 25 : sx->port, addr->message);
1242 log_write(0, LOG_MAIN, "H=%s [%s]: %s", sx->conn_args.host->name,
1243 sx->conn_args.host->address, addr->message);
1245 #ifndef DISABLE_EVENT
1247 msg_event_raise(US"msg:rcpt:defer", addr);
1250 /* Do not put this message on the list of those waiting for specific
1251 hosts, as otherwise it is likely to be tried too often. */
1253 update_waiting = FALSE;
1255 /* Add a retry item for the address so that it doesn't get tried again
1256 too soon. If address_retry_include_sender is true, add the sender address
1257 to the retry key. */
1259 retry_add_item(addr,
1260 ob->address_retry_include_sender
1261 ? string_sprintf("%s:<%s>", addr->address_retry_key, sender_address)
1262 : addr->address_retry_key,
1267 } /* Loop for next RCPT response */
1269 /* Update where to start at for the next block of responses, unless we
1270 have already handled all the addresses. */
1272 if (addr) sx->sync_addr = addr->next;
1274 /* Handle a response to DATA. If we have not had any good recipients, either
1275 previously or in this block, the response is ignored. */
1277 if (pending_DATA != 0)
1279 DEBUG(D_transport) debug_printf("%s expect data\n", __FUNCTION__);
1280 if (!smtp_read_response(sx, sx->buffer, sizeof(sx->buffer),
1281 '3', ob->command_timeout))
1287 if (errno == ERRNO_TLSFAILURE) /* Error on first TLS read */
1290 if (pending_DATA > 0 || (yield & 1) != 0)
1292 if (errno == 0 && sx->buffer[0] == '4')
1294 errno = ERRNO_DATA4XX;
1295 sx->first_addr->more_errno |= ((sx->buffer[1] - '0')*10 + sx->buffer[2] - '0') << 8;
1299 (void)check_response(sx->conn_args.host, &errno, 0, sx->buffer, &code, &msg, &pass_message);
1300 DEBUG(D_transport) debug_printf("%s\nerror for DATA ignored: pipelining "
1301 "is in use and there were no good recipients\n", msg);
1305 /* All responses read and handled; MAIL (if present) received 2xx and DATA (if
1306 present) received 3xx. If any RCPTs were handled and yielded anything other
1307 than 4xx, yield will be set non-zero. */
1316 /* Try an authenticator's client entry */
1319 try_authenticator(smtp_context * sx, auth_instance * au)
1321 smtp_transport_options_block * ob = sx->conn_args.ob; /* transport options */
1322 host_item * host = sx->conn_args.host; /* host to deliver to */
1325 sx->outblock.authenticating = TRUE;
1326 rc = (au->info->clientcode)(au, sx, ob->command_timeout,
1327 sx->buffer, sizeof(sx->buffer));
1328 sx->outblock.authenticating = FALSE;
1329 DEBUG(D_transport) debug_printf("%s authenticator yielded %d\n", au->name, rc);
1331 /* A temporary authentication failure must hold up delivery to
1332 this host. After a permanent authentication failure, we carry on
1333 to try other authentication methods. If all fail hard, try to
1334 deliver the message unauthenticated unless require_auth was set. */
1339 f.smtp_authenticated = TRUE; /* stops the outer loop */
1340 client_authenticator = au->name;
1341 if (au->set_client_id)
1342 client_authenticated_id = expand_string(au->set_client_id);
1345 /* Failure after writing a command */
1350 /* Failure after reading a response */
1353 if (errno != 0 || sx->buffer[0] != '5') return FAIL;
1354 log_write(0, LOG_MAIN, "%s authenticator failed H=%s [%s] %s",
1355 au->name, host->name, host->address, sx->buffer);
1358 /* Failure by some other means. In effect, the authenticator
1359 decided it wasn't prepared to handle this case. Typically this
1360 is the result of "fail" in an expansion string. Do we need to
1361 log anything here? Feb 2006: a message is now put in the buffer
1362 if logging is required. */
1365 if (*sx->buffer != 0)
1366 log_write(0, LOG_MAIN, "%s authenticator cancelled "
1367 "authentication H=%s [%s] %s", au->name, host->name,
1368 host->address, sx->buffer);
1371 /* Internal problem, message in buffer. */
1374 set_errno_nohost(sx->addrlist, ERRNO_AUTHPROB, string_copy(sx->buffer),
1384 /* Do the client side of smtp-level authentication.
1387 sx smtp connection context
1389 sx->buffer should have the EHLO response from server (gets overwritten)
1392 OK Success, or failed (but not required): global "smtp_authenticated" set
1393 DEFER Failed authentication (and was required)
1394 ERROR Internal problem
1396 FAIL_SEND Failed communications - transmit
1401 smtp_auth(smtp_context * sx)
1403 host_item * host = sx->conn_args.host; /* host to deliver to */
1404 smtp_transport_options_block * ob = sx->conn_args.ob; /* transport options */
1405 int require_auth = verify_check_given_host(CUSS &ob->hosts_require_auth, host);
1406 #ifdef SUPPORT_PIPE_CONNECT
1407 unsigned short authbits = tls_out.active.sock >= 0
1408 ? sx->ehlo_resp.crypted_auths : sx->ehlo_resp.cleartext_auths;
1410 uschar * fail_reason = US"server did not advertise AUTH support";
1412 f.smtp_authenticated = FALSE;
1413 client_authenticator = client_authenticated_id = client_authenticated_sender = NULL;
1416 regex_AUTH = regex_must_compile(AUTHS_REGEX, FALSE, TRUE);
1418 /* Is the server offering AUTH? */
1422 #ifdef SUPPORT_PIPE_CONNECT
1423 sx->early_pipe_active ? authbits
1426 regex_match_and_setup(regex_AUTH, sx->buffer, 0, -1)
1429 uschar * names = NULL;
1430 expand_nmax = -1; /* reset */
1432 #ifdef SUPPORT_PIPE_CONNECT
1433 if (!sx->early_pipe_active)
1435 names = string_copyn(expand_nstring[1], expand_nlength[1]);
1437 /* Must not do this check until after we have saved the result of the
1438 regex match above as the check could be another RE. */
1440 if ( require_auth == OK
1441 || verify_check_given_host(CUSS &ob->hosts_try_auth, host) == OK)
1443 DEBUG(D_transport) debug_printf("scanning authentication mechanisms\n");
1444 fail_reason = US"no common mechanisms were found";
1446 #ifdef SUPPORT_PIPE_CONNECT
1447 if (sx->early_pipe_active)
1449 /* Scan our authenticators (which support use by a client and were offered
1450 by the server (checked at cache-write time)), not suppressed by
1451 client_condition. If one is found, attempt to authenticate by calling its
1452 client function. We are limited to supporting up to 16 authenticator
1453 public-names by the number of bits in a short. */
1459 for (bitnum = 0, au = auths;
1460 !f.smtp_authenticated && au && bitnum < 16;
1461 bitnum++, au = au->next) if (authbits & BIT(bitnum))
1463 if ( au->client_condition
1464 && !expand_check_condition(au->client_condition, au->name,
1465 US"client authenticator"))
1467 DEBUG(D_transport) debug_printf("skipping %s authenticator: %s\n",
1468 au->name, "client_condition is false");
1472 /* Found data for a listed mechanism. Call its client entry. Set
1473 a flag in the outblock so that data is overwritten after sending so
1474 that reflections don't show it. */
1476 fail_reason = US"authentication attempt(s) failed";
1478 if ((rc = try_authenticator(sx, au)) != OK)
1485 /* Scan the configured authenticators looking for one which is configured
1486 for use as a client, which is not suppressed by client_condition, and
1487 whose name matches an authentication mechanism supported by the server.
1488 If one is found, attempt to authenticate by calling its client function.
1491 for (auth_instance * au = auths; !f.smtp_authenticated && au; au = au->next)
1496 || ( au->client_condition
1497 && !expand_check_condition(au->client_condition, au->name,
1498 US"client authenticator")))
1500 DEBUG(D_transport) debug_printf("skipping %s authenticator: %s\n",
1502 (au->client)? "client_condition is false" :
1503 "not configured as a client");
1507 /* Loop to scan supported server mechanisms */
1511 int len = Ustrlen(au->public_name);
1514 while (isspace(*p)) p++;
1516 if (strncmpic(au->public_name, p, len) != 0 ||
1517 (p[len] != 0 && !isspace(p[len])))
1519 while (*p != 0 && !isspace(*p)) p++;
1523 /* Found data for a listed mechanism. Call its client entry. Set
1524 a flag in the outblock so that data is overwritten after sending so
1525 that reflections don't show it. */
1527 fail_reason = US"authentication attempt(s) failed";
1529 if ((rc = try_authenticator(sx, au)) != OK)
1532 break; /* If not authenticated, try next authenticator */
1533 } /* Loop for scanning supported server mechanisms */
1534 } /* Loop for further authenticators */
1538 /* If we haven't authenticated, but are required to, give up. */
1540 if (require_auth == OK && !f.smtp_authenticated)
1542 set_errno_nohost(sx->addrlist, ERRNO_AUTHFAIL,
1543 string_sprintf("authentication required but %s", fail_reason), DEFER,
1552 /* Construct AUTH appendix string for MAIL TO */
1555 buffer to build string
1556 addrlist chain of potential addresses to deliver
1557 ob transport options
1559 Globals f.smtp_authenticated
1560 client_authenticated_sender
1561 Return True on error, otherwise buffer has (possibly empty) terminated string
1565 smtp_mail_auth_str(uschar *buffer, unsigned bufsize, address_item *addrlist,
1566 smtp_transport_options_block *ob)
1568 uschar * local_authenticated_sender = authenticated_sender;
1571 debug_printf("smtp_mail_auth_str: as<%s> os<%s> SA<%s>\n", authenticated_sender, ob->authenticated_sender, f.smtp_authenticated?"Y":"N");
1574 if (ob->authenticated_sender)
1576 uschar *new = expand_string(ob->authenticated_sender);
1579 if (!f.expand_string_forcedfail)
1581 uschar *message = string_sprintf("failed to expand "
1582 "authenticated_sender: %s", expand_string_message);
1583 set_errno_nohost(addrlist, ERRNO_EXPANDFAIL, message, DEFER, FALSE);
1587 else if (*new) local_authenticated_sender = new;
1590 /* Add the authenticated sender address if present */
1592 if ( (f.smtp_authenticated || ob->authenticated_sender_force)
1593 && local_authenticated_sender)
1595 string_format_nt(buffer, bufsize, " AUTH=%s",
1596 auth_xtextencode(local_authenticated_sender,
1597 Ustrlen(local_authenticated_sender)));
1598 client_authenticated_sender = string_copy(local_authenticated_sender);
1609 /* Lookup TLSA record for host/port.
1610 Return: OK success with dnssec; DANE mode
1611 DEFER Do not use this host now, may retry later
1612 FAIL_FORCED No TLSA record; DANE not usable
1613 FAIL Do not use this connection
1617 tlsa_lookup(const host_item * host, dns_answer * dnsa, BOOL dane_required)
1619 /* move this out to host.c given the similarity to dns_lookup() ? */
1621 const uschar * fullname = buffer;
1625 /* TLSA lookup string */
1626 (void)sprintf(CS buffer, "_%d._tcp.%.256s", host->port, host->name);
1628 rc = dns_lookup(dnsa, buffer, T_TLSA, &fullname);
1629 sec = dns_is_secure(dnsa);
1631 debug_printf("TLSA lookup ret %d %sDNSSEC\n", rc, sec ? "" : "not ");
1636 return DEFER; /* just defer this TLS'd conn */
1644 for (dns_record * rr = dns_next_rr(dnsa, &dnss, RESET_ANSWERS); rr;
1645 rr = dns_next_rr(dnsa, &dnss, RESET_NEXT))
1646 if (rr->type == T_TLSA && rr->size > 3)
1648 uint16_t payload_length = rr->size - 3;
1649 uschar s[MAX_TLSA_EXPANDED_SIZE], * sp = s, * p = US rr->data;
1651 sp += sprintf(CS sp, "%d ", *p++); /* usage */
1652 sp += sprintf(CS sp, "%d ", *p++); /* selector */
1653 sp += sprintf(CS sp, "%d ", *p++); /* matchtype */
1654 while (payload_length-- > 0 && sp-s < (MAX_TLSA_EXPANDED_SIZE - 4))
1655 sp += sprintf(CS sp, "%02x", *p++);
1657 debug_printf(" %s\n", s);
1662 log_write(0, LOG_MAIN,
1663 "DANE error: TLSA lookup for %s not DNSSEC", host->name);
1666 case DNS_NODATA: /* no TLSA RR for this lookup */
1667 case DNS_NOMATCH: /* no records at all for this lookup */
1668 return dane_required ? FAIL : FAIL_FORCED;
1672 return dane_required ? FAIL : DEFER;
1679 typedef struct smtp_compare_s
1681 uschar *current_sender_address;
1682 struct transport_instance *tblock;
1686 /* Create a unique string that identifies this message, it is based on
1687 sender_address, helo_data and tls_certificate if enabled.
1691 smtp_local_identity(uschar * sender, struct transport_instance * tblock)
1693 address_item * addr1;
1694 uschar * if1 = US"";
1695 uschar * helo1 = US"";
1697 uschar * tlsc1 = US"";
1699 uschar * save_sender_address = sender_address;
1700 uschar * local_identity = NULL;
1701 smtp_transport_options_block * ob = SOB tblock->options_block;
1703 sender_address = sender;
1705 addr1 = deliver_make_addr (sender, TRUE);
1706 deliver_set_expansions(addr1);
1709 if1 = expand_string(ob->interface);
1712 helo1 = expand_string(ob->helo_data);
1715 if (ob->tls_certificate)
1716 tlsc1 = expand_string(ob->tls_certificate);
1717 local_identity = string_sprintf ("%s^%s^%s", if1, helo1, tlsc1);
1719 local_identity = string_sprintf ("%s^%s", if1, helo1);
1722 deliver_set_expansions(NULL);
1723 sender_address = save_sender_address;
1725 return local_identity;
1730 /* This routine is a callback that is called from transport_check_waiting.
1731 This function will evaluate the incoming message versus the previous
1732 message. If the incoming message is using a different local identity then
1733 we will veto this new message. */
1736 smtp_are_same_identities(uschar * message_id, smtp_compare_t * s_compare)
1738 uschar * message_local_identity,
1739 * current_local_identity,
1740 * new_sender_address;
1742 current_local_identity =
1743 smtp_local_identity(s_compare->current_sender_address, s_compare->tblock);
1745 if (!(new_sender_address = deliver_get_sender_address(message_id)))
1748 message_local_identity =
1749 smtp_local_identity(new_sender_address, s_compare->tblock);
1751 return Ustrcmp(current_local_identity, message_local_identity) == 0;
1757 ehlo_response(uschar * buf, unsigned checks)
1759 size_t bsize = Ustrlen(buf);
1761 /* debug_printf("%s: check for 0x%04x\n", __FUNCTION__, checks); */
1764 if ( checks & OPTION_TLS
1765 && pcre_exec(regex_STARTTLS, NULL, CS buf, bsize, 0, PCRE_EOPT, NULL, 0) < 0)
1767 checks &= ~OPTION_TLS;
1769 if ( checks & OPTION_IGNQ
1770 && pcre_exec(regex_IGNOREQUOTA, NULL, CS buf, bsize, 0,
1771 PCRE_EOPT, NULL, 0) < 0)
1772 checks &= ~OPTION_IGNQ;
1774 if ( checks & OPTION_CHUNKING
1775 && pcre_exec(regex_CHUNKING, NULL, CS buf, bsize, 0, PCRE_EOPT, NULL, 0) < 0)
1776 checks &= ~OPTION_CHUNKING;
1778 #ifndef DISABLE_PRDR
1779 if ( checks & OPTION_PRDR
1780 && pcre_exec(regex_PRDR, NULL, CS buf, bsize, 0, PCRE_EOPT, NULL, 0) < 0)
1782 checks &= ~OPTION_PRDR;
1785 if ( checks & OPTION_UTF8
1786 && pcre_exec(regex_UTF8, NULL, CS buf, bsize, 0, PCRE_EOPT, NULL, 0) < 0)
1788 checks &= ~OPTION_UTF8;
1790 if ( checks & OPTION_DSN
1791 && pcre_exec(regex_DSN, NULL, CS buf, bsize, 0, PCRE_EOPT, NULL, 0) < 0)
1792 checks &= ~OPTION_DSN;
1794 if ( checks & OPTION_PIPE
1795 && pcre_exec(regex_PIPELINING, NULL, CS buf, bsize, 0,
1796 PCRE_EOPT, NULL, 0) < 0)
1797 checks &= ~OPTION_PIPE;
1799 if ( checks & OPTION_SIZE
1800 && pcre_exec(regex_SIZE, NULL, CS buf, bsize, 0, PCRE_EOPT, NULL, 0) < 0)
1801 checks &= ~OPTION_SIZE;
1803 #ifdef SUPPORT_PIPE_CONNECT
1804 if ( checks & OPTION_EARLY_PIPE
1805 && pcre_exec(regex_EARLY_PIPE, NULL, CS buf, bsize, 0,
1806 PCRE_EOPT, NULL, 0) < 0)
1808 checks &= ~OPTION_EARLY_PIPE;
1810 /* debug_printf("%s: found 0x%04x\n", __FUNCTION__, checks); */
1816 /* Callback for emitting a BDAT data chunk header.
1818 If given a nonzero size, first flush any buffered SMTP commands
1819 then emit the command.
1821 Reap previous SMTP command responses if requested, and always reap
1822 the response from a previous BDAT command.
1825 tctx transport context
1826 chunk_size value for SMTP BDAT command
1828 tc_chunk_last add LAST option to SMTP BDAT command
1829 tc_reap_prev reap response to previous SMTP commands
1833 DEFER TLS error on first read (EHLO-resp); errno set
1837 smtp_chunk_cmd_callback(transport_ctx * tctx, unsigned chunk_size,
1840 smtp_transport_options_block * ob = SOB tctx->tblock->options_block;
1841 smtp_context * sx = tctx->smtp_context;
1845 /* Write SMTP chunk header command. If not reaping responses, note that
1846 there may be more writes (like, the chunk data) done soon. */
1850 #ifdef SUPPORT_PIPE_CONNECT
1851 BOOL new_conn = !!(sx->outblock.conn_args);
1853 if((cmd_count = smtp_write_command(sx,
1854 flags & tc_reap_prev ? SCMD_FLUSH : SCMD_MORE,
1855 "BDAT %u%s\r\n", chunk_size, flags & tc_chunk_last ? " LAST" : "")
1856 ) < 0) return ERROR;
1857 if (flags & tc_chunk_last)
1858 data_command = string_copy(big_buffer); /* Save for later error message */
1859 #ifdef SUPPORT_PIPE_CONNECT
1860 /* That command write could have been the one that made the connection.
1861 Copy the fd from the client conn ctx (smtp transport specific) to the
1862 generic transport ctx. */
1865 tctx->u.fd = sx->outblock.cctx->sock;
1869 prev_cmd_count = cmd_count += sx->cmd_count;
1871 /* Reap responses for any previous, but not one we just emitted */
1875 if (sx->pending_BDAT)
1878 if (flags & tc_reap_prev && prev_cmd_count > 0)
1880 DEBUG(D_transport) debug_printf("look for %d responses"
1881 " for previous pipelined cmds\n", prev_cmd_count);
1883 switch(sync_responses(sx, prev_cmd_count, 0))
1885 case 1: /* 2xx (only) => OK */
1886 case 3: sx->good_RCPT = TRUE; /* 2xx & 5xx => OK & progress made */
1887 case 2: sx->completed_addr = TRUE; /* 5xx (only) => progress made */
1888 case 0: break; /* No 2xx or 5xx, but no probs */
1890 case -5: errno = ERRNO_TLSFAILURE;
1892 #ifdef SUPPORT_PIPE_CONNECT
1893 case -4: /* non-2xx for pipelined banner or EHLO */
1895 case -1: /* Timeout on RCPT */
1896 default: return ERROR; /* I/O error, or any MAIL/DATA error */
1899 if (!sx->pending_BDAT)
1900 pipelining_active = FALSE;
1903 /* Reap response for an outstanding BDAT */
1905 if (sx->pending_BDAT)
1907 DEBUG(D_transport) debug_printf("look for one response for BDAT\n");
1909 if (!smtp_read_response(sx, sx->buffer, sizeof(sx->buffer), '2',
1910 ob->command_timeout))
1912 if (errno == 0 && sx->buffer[0] == '4')
1914 errno = ERRNO_DATA4XX; /*XXX does this actually get used? */
1915 sx->addrlist->more_errno |=
1916 ((sx->buffer[1] - '0')*10 + sx->buffer[2] - '0') << 8;
1921 sx->pending_BDAT = FALSE;
1922 pipelining_active = FALSE;
1924 else if (chunk_size > 0)
1925 sx->pending_BDAT = TRUE;
1928 sx->cmd_count = cmd_count;
1936 /*************************************************
1937 * Make connection for given message *
1938 *************************************************/
1942 ctx connection context
1943 suppress_tls if TRUE, don't attempt a TLS connection - this is set for
1944 a second attempt after TLS initialization fails
1946 Returns: OK - the connection was made and the delivery attempted;
1947 fd is set in the conn context, tls_out set up.
1948 DEFER - the connection could not be made, or something failed
1949 while setting up the SMTP session, or there was a
1950 non-message-specific error, such as a timeout.
1951 ERROR - helo_data or add_headers or authenticated_sender is
1952 specified for this transport, and the string failed
1956 smtp_setup_conn(smtp_context * sx, BOOL suppress_tls)
1958 smtp_transport_options_block * ob = sx->conn_args.tblock->options_block;
1959 BOOL pass_message = FALSE;
1960 uschar * message = NULL;
1964 uschar * tls_errstr;
1967 sx->conn_args.ob = ob;
1969 sx->lmtp = strcmpic(ob->protocol, US"lmtp") == 0;
1970 sx->smtps = strcmpic(ob->protocol, US"smtps") == 0;
1972 sx->send_rset = TRUE;
1973 sx->send_quit = TRUE;
1974 sx->setting_up = TRUE;
1976 sx->esmtp_sent = FALSE;
1978 sx->utf8_needed = FALSE;
1980 sx->dsn_all_lasthop = TRUE;
1982 sx->conn_args.dane = FALSE;
1984 verify_check_given_host(CUSS &ob->hosts_require_dane, sx->conn_args.host) == OK;
1986 #ifdef SUPPORT_PIPE_CONNECT
1987 sx->early_pipe_active = sx->early_pipe_ok = FALSE;
1988 sx->ehlo_resp.cleartext_features = sx->ehlo_resp.crypted_features = 0;
1989 sx->pending_BANNER = sx->pending_EHLO = FALSE;
1992 if ((sx->max_rcpt = sx->conn_args.tblock->max_addresses) == 0) sx->max_rcpt = 999999;
1993 sx->peer_offered = 0;
1994 sx->avoid_option = 0;
1995 sx->igquotstr = US"";
1996 if (!sx->helo_data) sx->helo_data = ob->helo_data;
1997 #ifdef EXPERIMENTAL_DSN_INFO
1998 sx->smtp_greeting = NULL;
1999 sx->helo_response = NULL;
2002 smtp_command = US"initial connection";
2003 sx->buffer[0] = '\0';
2005 /* Set up the buffer for reading SMTP response packets. */
2007 sx->inblock.buffer = sx->inbuffer;
2008 sx->inblock.buffersize = sizeof(sx->inbuffer);
2009 sx->inblock.ptr = sx->inbuffer;
2010 sx->inblock.ptrend = sx->inbuffer;
2012 /* Set up the buffer for holding SMTP commands while pipelining */
2014 sx->outblock.buffer = sx->outbuffer;
2015 sx->outblock.buffersize = sizeof(sx->outbuffer);
2016 sx->outblock.ptr = sx->outbuffer;
2017 sx->outblock.cmd_count = 0;
2018 sx->outblock.authenticating = FALSE;
2019 sx->outblock.conn_args = NULL;
2021 /* Reset the parameters of a TLS session. */
2024 tls_out.cipher = NULL; /* the one we may use for this transport */
2025 tls_out.ourcert = NULL;
2026 tls_out.peercert = NULL;
2027 tls_out.peerdn = NULL;
2031 tls_out.ocsp = OCSP_NOT_REQ;
2032 #ifdef EXPERIMENTAL_TLS_RESUME
2033 tls_out.resumption = 0;
2036 /* Flip the legacy TLS-related variables over to the outbound set in case
2037 they're used in the context of the transport. Don't bother resetting
2038 afterward (when being used by a transport) as we're in a subprocess.
2039 For verify, unflipped once the callout is dealt with */
2041 tls_modify_variables(&tls_out);
2046 set_errno_nohost(sx->addrlist, ERRNO_TLSFAILURE, US"TLS support not available",
2052 /* Make a connection to the host if this isn't a continued delivery, and handle
2053 the initial interaction and HELO/EHLO/LHLO. Connect timeout errors are handled
2054 specially so they can be identified for retries. */
2056 if (!continue_hostname)
2059 HDEBUG(D_verify) debug_printf("interface=%s port=%d\n", sx->conn_args.interface, sx->port);
2061 /* Get the actual port the connection will use, into sx->conn_args.host */
2063 smtp_port_for_connect(sx->conn_args.host, sx->port);
2066 /* Do TLSA lookup for DANE */
2068 tls_out.dane_verified = FALSE;
2069 tls_out.tlsa_usage = 0;
2071 if (sx->conn_args.host->dnssec == DS_YES)
2073 if( sx->dane_required
2074 || verify_check_given_host(CUSS &ob->hosts_try_dane, sx->conn_args.host) == OK
2076 switch (rc = tlsa_lookup(sx->conn_args.host, &sx->conn_args.tlsa_dnsa, sx->dane_required))
2078 case OK: sx->conn_args.dane = TRUE;
2079 ob->tls_tempfail_tryclear = FALSE;
2081 case FAIL_FORCED: break;
2082 default: set_errno_nohost(sx->addrlist, ERRNO_DNSDEFER,
2083 string_sprintf("DANE error: tlsa lookup %s",
2086 # ifndef DISABLE_EVENT
2087 (void) event_raise(sx->conn_args.tblock->event_action,
2088 US"dane:fail", sx->dane_required
2089 ? US"dane-required" : US"dnssec-invalid");
2094 else if (sx->dane_required)
2096 set_errno_nohost(sx->addrlist, ERRNO_DNSDEFER,
2097 string_sprintf("DANE error: %s lookup not DNSSEC", sx->conn_args.host->name),
2099 # ifndef DISABLE_EVENT
2100 (void) event_raise(sx->conn_args.tblock->event_action,
2101 US"dane:fail", US"dane-required");
2108 /* Make the TCP connection */
2110 sx->cctx.tls_ctx = NULL;
2111 sx->inblock.cctx = sx->outblock.cctx = &sx->cctx;
2112 sx->avoid_option = sx->peer_offered = smtp_peer_options = 0;
2114 #ifdef SUPPORT_PIPE_CONNECT
2115 if ( verify_check_given_host(CUSS &ob->hosts_pipe_connect,
2116 sx->conn_args.host) == OK)
2118 /* We don't find out the local ip address until the connect, so if
2119 the helo string might use it avoid doing early-pipelining. */
2122 || !Ustrstr(sx->helo_data, "$sending_ip_address")
2123 || Ustrstr(sx->helo_data, "def:sending_ip_address")
2126 sx->early_pipe_ok = TRUE;
2127 if ( read_ehlo_cache_entry(sx)
2128 && sx->ehlo_resp.cleartext_features & OPTION_EARLY_PIPE)
2131 debug_printf("Using cached cleartext PIPE_CONNECT\n");
2132 sx->early_pipe_active = TRUE;
2133 sx->peer_offered = sx->ehlo_resp.cleartext_features;
2136 else DEBUG(D_transport)
2137 debug_printf("helo needs $sending_ip_address\n");
2139 if (sx->early_pipe_active)
2140 sx->outblock.conn_args = &sx->conn_args;
2144 if ((sx->cctx.sock = smtp_connect(&sx->conn_args, NULL)) < 0)
2146 set_errno_nohost(sx->addrlist,
2147 errno == ETIMEDOUT ? ERRNO_CONNECTTIMEOUT : errno,
2148 sx->verify ? US strerror(errno) : NULL,
2150 sx->send_quit = FALSE;
2154 /* Expand the greeting message while waiting for the initial response. (Makes
2155 sense if helo_data contains ${lookup dnsdb ...} stuff). The expansion is
2156 delayed till here so that $sending_interface and $sending_port are set. */
2157 /*XXX early-pipe: they still will not be. Is there any way to find out what they
2158 will be? Somehow I doubt it. */
2161 if (!(sx->helo_data = expand_string(sx->helo_data)))
2163 log_write(0, LOG_MAIN|LOG_PANIC,
2164 "<%s>: failed to expand transport's helo_data value for callout: %s",
2165 sx->addrlist->address, expand_string_message);
2170 expand_string_message = NULL;
2171 if ((sx->helo_data = string_domain_utf8_to_alabel(sx->helo_data,
2172 &expand_string_message)),
2173 expand_string_message)
2175 log_write(0, LOG_MAIN|LOG_PANIC,
2176 "<%s>: failed to expand transport's helo_data value for callout: %s",
2177 sx->addrlist->address, expand_string_message);
2179 sx->helo_data = NULL;
2183 /* The first thing is to wait for an initial OK response. The dreaded "goto"
2184 is nevertheless a reasonably clean way of programming this kind of logic,
2185 where you want to escape on any error. */
2189 #ifdef SUPPORT_PIPE_CONNECT
2190 if (sx->early_pipe_active)
2192 sx->pending_BANNER = TRUE; /* sync_responses() must eventually handle */
2193 sx->outblock.cmd_count = 1;
2199 (void) setsockopt(sx->cctx.sock, IPPROTO_TCP, TCP_QUICKACK, US &off,
2202 if (!smtp_reap_banner(sx))
2203 goto RESPONSE_FAILED;
2206 #ifndef DISABLE_EVENT
2209 lookup_dnssec_authenticated = sx->conn_args.host->dnssec==DS_YES ? US"yes"
2210 : sx->conn_args.host->dnssec==DS_NO ? US"no" : NULL;
2211 s = event_raise(sx->conn_args.tblock->event_action, US"smtp:connect", sx->buffer);
2214 set_errno_nohost(sx->addrlist, ERRNO_EXPANDFAIL,
2215 string_sprintf("deferred by smtp:connect event expansion: %s", s),
2223 /* Now check if the helo_data expansion went well, and sign off cleanly if
2228 message = string_sprintf("failed to expand helo_data: %s",
2229 expand_string_message);
2230 set_errno_nohost(sx->addrlist, ERRNO_EXPANDFAIL, message, DEFER, FALSE);
2236 /** Debugging without sending a message
2237 sx->addrlist->transport_return = DEFER;
2241 /* Errors that occur after this point follow an SMTP command, which is
2242 left in big_buffer by smtp_write_command() for use in error messages. */
2244 smtp_command = big_buffer;
2246 /* Tell the remote who we are...
2248 February 1998: A convention has evolved that ESMTP-speaking MTAs include the
2249 string "ESMTP" in their greeting lines, so make Exim send EHLO if the
2250 greeting is of this form. The assumption was that the far end supports it
2251 properly... but experience shows that there are some that give 5xx responses,
2252 even though the banner includes "ESMTP" (there's a bloody-minded one that
2253 says "ESMTP not spoken here"). Cope with that case.
2255 September 2000: Time has passed, and it seems reasonable now to always send
2256 EHLO at the start. It is also convenient to make the change while installing
2259 July 2003: Joachim Wieland met a broken server that advertises "PIPELINING"
2260 but times out after sending MAIL FROM, RCPT TO and DATA all together. There
2261 would be no way to send out the mails, so there is now a host list
2262 "hosts_avoid_esmtp" that disables ESMTP for special hosts and solves the
2263 PIPELINING problem as well. Maybe it can also be useful to cure other
2264 problems with broken servers.
2266 Exim originally sent "Helo" at this point and ran for nearly a year that way.
2267 Then somebody tried it with a Microsoft mailer... It seems that all other
2268 mailers use upper case for some reason (the RFC is quite clear about case
2269 independence) so, for peace of mind, I gave in. */
2271 sx->esmtp = verify_check_given_host(CUSS &ob->hosts_avoid_esmtp, sx->conn_args.host) != OK;
2273 /* Alas; be careful, since this goto is not an error-out, so conceivably
2274 we might set data between here and the target which we assume to exist
2275 and be usable. I can see this coming back to bite us. */
2279 smtp_peer_options |= OPTION_TLS;
2280 suppress_tls = FALSE;
2281 ob->tls_tempfail_tryclear = FALSE;
2282 smtp_command = US"SSL-on-connect";
2289 if (smtp_write_command(sx,
2290 #ifdef SUPPORT_PIPE_CONNECT
2291 sx->early_pipe_active ? SCMD_BUFFER :
2294 "%s %s\r\n", sx->lmtp ? "LHLO" : "EHLO", sx->helo_data) < 0)
2296 sx->esmtp_sent = TRUE;
2298 #ifdef SUPPORT_PIPE_CONNECT
2299 if (sx->early_pipe_active)
2301 sx->pending_EHLO = TRUE;
2303 /* If we have too many authenticators to handle and might need to AUTH
2304 for this transport, pipeline no further as we will need the
2305 list of auth methods offered. Reap the banner and EHLO. */
2307 if ( (ob->hosts_require_auth || ob->hosts_try_auth)
2308 && f.smtp_in_early_pipe_no_auth)
2310 DEBUG(D_transport) debug_printf("may need to auth, so pipeline no further\n");
2311 if (smtp_write_command(sx, SCMD_FLUSH, NULL) < 0)
2313 if (sync_responses(sx, 2, 0) != 0)
2316 debug_printf("failed reaping pipelined cmd responses\n");
2317 goto RESPONSE_FAILED;
2319 sx->early_pipe_active = FALSE;
2324 if (!smtp_reap_ehlo(sx))
2325 goto RESPONSE_FAILED;
2329 debug_printf("not sending EHLO (host matches hosts_avoid_esmtp)\n");
2331 #ifdef SUPPORT_PIPE_CONNECT
2332 if (!sx->early_pipe_active)
2337 int n = sizeof(sx->buffer);
2338 uschar * rsp = sx->buffer;
2340 if (sx->esmtp_sent && (n = Ustrlen(sx->buffer)) < sizeof(sx->buffer)/2)
2341 { rsp = sx->buffer + n + 1; n = sizeof(sx->buffer) - n; }
2343 if (smtp_write_command(sx, SCMD_FLUSH, "HELO %s\r\n", sx->helo_data) < 0)
2345 good_response = smtp_read_response(sx, rsp, n, '2', ob->command_timeout);
2346 #ifdef EXPERIMENTAL_DSN_INFO
2347 sx->helo_response = string_copy(rsp);
2351 /* Handle special logging for a closed connection after HELO
2352 when had previously sent EHLO */
2354 if (rsp != sx->buffer && rsp[0] == 0 && (errno == 0 || errno == ECONNRESET))
2356 errno = ERRNO_SMTPCLOSED;
2357 goto EHLOHELO_FAILED;
2359 memmove(sx->buffer, rsp, Ustrlen(rsp));
2360 goto RESPONSE_FAILED;
2364 if (sx->esmtp || sx->lmtp)
2366 #ifdef SUPPORT_PIPE_CONNECT
2367 if (!sx->early_pipe_active)
2370 sx->peer_offered = ehlo_response(sx->buffer,
2371 OPTION_TLS /* others checked later */
2372 #ifdef SUPPORT_PIPE_CONNECT
2373 | (sx->early_pipe_ok
2375 | OPTION_CHUNKING | OPTION_PRDR | OPTION_DSN | OPTION_PIPE | OPTION_SIZE
2384 #ifdef SUPPORT_PIPE_CONNECT
2385 if (sx->early_pipe_ok)
2387 sx->ehlo_resp.cleartext_features = sx->peer_offered;
2389 if ( (sx->peer_offered & (OPTION_PIPE | OPTION_EARLY_PIPE))
2390 == (OPTION_PIPE | OPTION_EARLY_PIPE))
2392 DEBUG(D_transport) debug_printf("PIPE_CONNECT usable in future for this IP\n");
2393 sx->ehlo_resp.cleartext_auths = study_ehlo_auths(sx);
2394 write_ehlo_cache_entry(sx);
2400 /* Set tls_offered if the response to EHLO specifies support for STARTTLS. */
2403 smtp_peer_options |= sx->peer_offered & OPTION_TLS;
2408 /* For continuing deliveries down the same channel, having re-exec'd the socket
2409 is the standard input; for a socket held open from verify it is recorded
2410 in the cutthrough context block. Either way we don't need to redo EHLO here
2411 (but may need to do so for TLS - see below).
2412 Set up the pointer to where subsequent commands will be left, for
2413 error messages. Note that smtp_peer_options will have been
2414 set from the command line if they were set in the process that passed the
2417 /*XXX continue case needs to propagate DSN_INFO, prob. in deliver.c
2418 as the continue goes via transport_pass_socket() and doublefork and exec.
2419 It does not wait. Unclear how we keep separate host's responses
2420 separate - we could match up by host ip+port as a bodge. */
2424 if (cutthrough.cctx.sock >= 0 && cutthrough.callout_hold_only)
2426 sx->cctx = cutthrough.cctx;
2427 sx->conn_args.host->port = sx->port = cutthrough.host.port;
2431 sx->cctx.sock = 0; /* stdin */
2432 sx->cctx.tls_ctx = NULL;
2433 smtp_port_for_connect(sx->conn_args.host, sx->port); /* Record the port that was used */
2435 sx->inblock.cctx = sx->outblock.cctx = &sx->cctx;
2436 smtp_command = big_buffer;
2437 sx->helo_data = NULL; /* ensure we re-expand ob->helo_data */
2439 /* For a continued connection with TLS being proxied for us, or a
2440 held-open verify connection with TLS, nothing more to do. */
2442 if ( continue_proxy_cipher
2443 || (cutthrough.cctx.sock >= 0 && cutthrough.callout_hold_only
2444 && cutthrough.is_tls)
2447 sx->peer_offered = smtp_peer_options;
2448 sx->pipelining_used = pipelining_active = !!(smtp_peer_options & OPTION_PIPE);
2449 HDEBUG(D_transport) debug_printf("continued connection, %s TLS\n",
2450 continue_proxy_cipher ? "proxied" : "verify conn with");
2453 HDEBUG(D_transport) debug_printf("continued connection, no TLS\n");
2456 /* If TLS is available on this connection, whether continued or not, attempt to
2457 start up a TLS session, unless the host is in hosts_avoid_tls. If successful,
2458 send another EHLO - the server may give a different answer in secure mode. We
2459 use a separate buffer for reading the response to STARTTLS so that if it is
2460 negative, the original EHLO data is available for subsequent analysis, should
2461 the client not be required to use TLS. If the response is bad, copy the buffer
2462 for error analysis. */
2465 if ( smtp_peer_options & OPTION_TLS
2467 && verify_check_given_host(CUSS &ob->hosts_avoid_tls, sx->conn_args.host) != OK
2469 || verify_check_given_host(CUSS &ob->hosts_verify_avoid_tls, sx->conn_args.host) != OK
2472 uschar buffer2[4096];
2474 if (smtp_write_command(sx, SCMD_FLUSH, "STARTTLS\r\n") < 0)
2477 #ifdef SUPPORT_PIPE_CONNECT
2478 /* If doing early-pipelining reap the banner and EHLO-response but leave
2479 the response for the STARTTLS we just sent alone. */
2481 if (sx->early_pipe_active && sync_responses(sx, 2, 0) != 0)
2484 debug_printf("failed reaping pipelined cmd responses\n");
2485 goto RESPONSE_FAILED;
2489 /* If there is an I/O error, transmission of this message is deferred. If
2490 there is a temporary rejection of STARRTLS and tls_tempfail_tryclear is
2491 false, we also defer. However, if there is a temporary rejection of STARTTLS
2492 and tls_tempfail_tryclear is true, or if there is an outright rejection of
2493 STARTTLS, we carry on. This means we will try to send the message in clear,
2494 unless the host is in hosts_require_tls (tested below). */
2496 if (!smtp_read_response(sx, buffer2, sizeof(buffer2), '2', ob->command_timeout))
2500 || (buffer2[0] == '4' && !ob->tls_tempfail_tryclear)
2503 Ustrncpy(sx->buffer, buffer2, sizeof(sx->buffer));
2504 sx->buffer[sizeof(sx->buffer)-1] = '\0';
2505 goto RESPONSE_FAILED;
2509 /* STARTTLS accepted: try to negotiate a TLS session. */
2514 if (!tls_client_start(&sx->cctx, &sx->conn_args, sx->addrlist, &tls_out, &tls_errstr))
2516 /* TLS negotiation failed; give an error. From outside, this function may
2517 be called again to try in clear on a new connection, if the options permit
2518 it for this host. */
2522 DEBUG(D_tls) debug_printf("TLS session fail: %s\n", tls_errstr);
2524 # ifdef SUPPORT_DANE
2525 if (sx->conn_args.dane)
2527 log_write(0, LOG_MAIN,
2528 "DANE attempt failed; TLS connection to %s [%s]: %s",
2529 sx->conn_args.host->name, sx->conn_args.host->address, tls_errstr);
2530 # ifndef DISABLE_EVENT
2531 (void) event_raise(sx->conn_args.tblock->event_action,
2532 US"dane:fail", US"validation-failure"); /* could do with better detail */
2537 errno = ERRNO_TLSFAILURE;
2538 message = string_sprintf("TLS session: %s", tls_errstr);
2539 sx->send_quit = FALSE;
2543 /* TLS session is set up */
2545 smtp_peer_options_wrap = smtp_peer_options;
2546 for (address_item * addr = sx->addrlist; addr; addr = addr->next)
2547 if (addr->transport_return == PENDING_DEFER)
2549 addr->cipher = tls_out.cipher;
2550 addr->ourcert = tls_out.ourcert;
2551 addr->peercert = tls_out.peercert;
2552 addr->peerdn = tls_out.peerdn;
2553 addr->ocsp = tls_out.ocsp;
2558 /* if smtps, we'll have smtp_command set to something else; always safe to
2560 smtp_command = big_buffer;
2562 /* If we started TLS, redo the EHLO/LHLO exchange over the secure channel. If
2563 helo_data is null, we are dealing with a connection that was passed from
2564 another process, and so we won't have expanded helo_data above. We have to
2565 expand it here. $sending_ip_address and $sending_port are set up right at the
2566 start of the Exim process (in exim.c). */
2568 if (tls_out.active.sock >= 0)
2570 uschar * greeting_cmd;
2572 if (!sx->helo_data && !(sx->helo_data = expand_string(ob->helo_data)))
2574 uschar *message = string_sprintf("failed to expand helo_data: %s",
2575 expand_string_message);
2576 set_errno_nohost(sx->addrlist, ERRNO_EXPANDFAIL, message, DEFER, FALSE);
2581 #ifdef SUPPORT_PIPE_CONNECT
2582 /* For SMTPS there is no cleartext early-pipe; use the crypted permission bit.
2583 We're unlikely to get the group sent and delivered before the server sends its
2584 banner, but it's still worth sending as a group.
2585 For STARTTLS allow for cleartext early-pipe but no crypted early-pipe, but not
2588 if (sx->smtps ? sx->early_pipe_ok : sx->early_pipe_active)
2590 sx->peer_offered = sx->ehlo_resp.crypted_features;
2591 if ((sx->early_pipe_active =
2592 !!(sx->ehlo_resp.crypted_features & OPTION_EARLY_PIPE)))
2593 DEBUG(D_transport) debug_printf("Using cached crypted PIPE_CONNECT\n");
2597 /* For SMTPS we need to wait for the initial OK response. */
2599 #ifdef SUPPORT_PIPE_CONNECT
2600 if (sx->early_pipe_active)
2602 sx->pending_BANNER = TRUE;
2603 sx->outblock.cmd_count = 1;
2607 if (!smtp_reap_banner(sx))
2608 goto RESPONSE_FAILED;
2611 greeting_cmd = US"LHLO";
2613 greeting_cmd = US"EHLO";
2616 greeting_cmd = US"HELO";
2618 debug_printf("not sending EHLO (host matches hosts_avoid_esmtp)\n");
2621 if (smtp_write_command(sx,
2622 #ifdef SUPPORT_PIPE_CONNECT
2623 sx->early_pipe_active ? SCMD_BUFFER :
2626 "%s %s\r\n", greeting_cmd, sx->helo_data) < 0)
2629 #ifdef SUPPORT_PIPE_CONNECT
2630 if (sx->early_pipe_active)
2631 sx->pending_EHLO = TRUE;
2635 if (!smtp_reap_ehlo(sx))
2638 /* The GnuTLS layer in Exim only spots a server-rejection of a client
2639 cert late, under TLS1.3 - which means here; the first time we try to
2640 receive crypted data. Treat it as if it was a connect-time failure.
2641 See also the early-pipe equivalent... which will be hard; every call
2642 to sync_responses will need to check the result.
2643 It would be nicer to have GnuTLS check the cert during the handshake.
2644 Can it do that, with all the flexibility we need? */
2646 tls_errstr = US"error on first read";
2647 goto GNUTLS_CONN_FAILED;
2650 goto RESPONSE_FAILED;
2652 smtp_peer_options = 0;
2656 /* If the host is required to use a secure channel, ensure that we
2660 # ifdef SUPPORT_DANE
2661 || sx->conn_args.dane
2663 || verify_check_given_host(CUSS &ob->hosts_require_tls, sx->conn_args.host) == OK
2666 errno = ERRNO_TLSREQUIRED;
2667 message = string_sprintf("a TLS session is required, but %s",
2668 smtp_peer_options & OPTION_TLS
2669 ? "an attempt to start TLS failed" : "the server did not offer TLS support");
2670 # if defined(SUPPORT_DANE) && !defined(DISABLE_EVENT)
2671 if (sx->conn_args.dane)
2672 (void) event_raise(sx->conn_args.tblock->event_action, US"dane:fail",
2673 smtp_peer_options & OPTION_TLS
2674 ? US"validation-failure" /* could do with better detail */
2675 : US"starttls-not-supported");
2679 #endif /*DISABLE_TLS*/
2681 /* If TLS is active, we have just started it up and re-done the EHLO command,
2682 so its response needs to be analyzed. If TLS is not active and this is a
2683 continued session down a previously-used socket, we haven't just done EHLO, so
2686 if (continue_hostname == NULL
2688 || tls_out.active.sock >= 0
2692 if (sx->esmtp || sx->lmtp)
2694 #ifdef SUPPORT_PIPE_CONNECT
2695 if (!sx->early_pipe_active)
2698 sx->peer_offered = ehlo_response(sx->buffer,
2700 #ifdef SUPPORT_PIPE_CONNECT
2701 | (sx->lmtp && ob->lmtp_ignore_quota ? OPTION_IGNQ : 0)
2702 | OPTION_DSN | OPTION_PIPE | OPTION_SIZE
2703 | OPTION_CHUNKING | OPTION_PRDR | OPTION_UTF8
2704 | (tls_out.active.sock >= 0 ? OPTION_EARLY_PIPE : 0) /* not for lmtp */
2708 | (sx->lmtp && ob->lmtp_ignore_quota ? OPTION_IGNQ : 0)
2711 # ifdef SUPPORT_I18N
2712 | (sx->addrlist->prop.utf8_msg ? OPTION_UTF8 : 0)
2713 /*XXX if we hand peercaps on to continued-conn processes,
2714 must not depend on this addr */
2718 | (ob->size_addition >= 0 ? OPTION_SIZE : 0)
2721 #ifdef SUPPORT_PIPE_CONNECT
2722 if (tls_out.active.sock >= 0)
2723 sx->ehlo_resp.crypted_features = sx->peer_offered;
2727 /* Set for IGNOREQUOTA if the response to LHLO specifies support and the
2728 lmtp_ignore_quota option was set. */
2730 sx->igquotstr = sx->peer_offered & OPTION_IGNQ ? US" IGNOREQUOTA" : US"";
2732 /* If the response to EHLO specified support for the SIZE parameter, note
2733 this, provided size_addition is non-negative. */
2735 smtp_peer_options |= sx->peer_offered & OPTION_SIZE;
2737 /* Note whether the server supports PIPELINING. If hosts_avoid_esmtp matched
2738 the current host, esmtp will be false, so PIPELINING can never be used. If
2739 the current host matches hosts_avoid_pipelining, don't do it. */
2741 if ( sx->peer_offered & OPTION_PIPE
2742 && verify_check_given_host(CUSS &ob->hosts_avoid_pipelining, sx->conn_args.host) != OK)
2743 smtp_peer_options |= OPTION_PIPE;
2745 DEBUG(D_transport) debug_printf("%susing PIPELINING\n",
2746 smtp_peer_options & OPTION_PIPE ? "" : "not ");
2748 if ( sx->peer_offered & OPTION_CHUNKING
2749 && verify_check_given_host(CUSS &ob->hosts_try_chunking, sx->conn_args.host) != OK)
2750 sx->peer_offered &= ~OPTION_CHUNKING;
2752 if (sx->peer_offered & OPTION_CHUNKING)
2753 DEBUG(D_transport) debug_printf("CHUNKING usable\n");
2755 #ifndef DISABLE_PRDR
2756 if ( sx->peer_offered & OPTION_PRDR
2757 && verify_check_given_host(CUSS &ob->hosts_try_prdr, sx->conn_args.host) != OK)
2758 sx->peer_offered &= ~OPTION_PRDR;
2760 if (sx->peer_offered & OPTION_PRDR)
2761 DEBUG(D_transport) debug_printf("PRDR usable\n");
2764 /* Note if the server supports DSN */
2765 smtp_peer_options |= sx->peer_offered & OPTION_DSN;
2766 DEBUG(D_transport) debug_printf("%susing DSN\n",
2767 sx->peer_offered & OPTION_DSN ? "" : "not ");
2769 #ifdef SUPPORT_PIPE_CONNECT
2770 if ( sx->early_pipe_ok
2771 && !sx->early_pipe_active
2772 && tls_out.active.sock >= 0
2773 && smtp_peer_options & OPTION_PIPE
2774 && ( sx->ehlo_resp.cleartext_features | sx->ehlo_resp.crypted_features)
2775 & OPTION_EARLY_PIPE)
2777 DEBUG(D_transport) debug_printf("PIPE_CONNECT usable in future for this IP\n");
2778 sx->ehlo_resp.crypted_auths = study_ehlo_auths(sx);
2779 write_ehlo_cache_entry(sx);
2783 /* Note if the response to EHLO specifies support for the AUTH extension.
2784 If it has, check that this host is one we want to authenticate to, and do
2785 the business. The host name and address must be available when the
2786 authenticator's client driver is running. */
2788 switch (yield = smtp_auth(sx))
2790 default: goto SEND_QUIT;
2792 case FAIL_SEND: goto SEND_FAILED;
2793 case FAIL: goto RESPONSE_FAILED;
2797 sx->pipelining_used = pipelining_active = !!(smtp_peer_options & OPTION_PIPE);
2799 /* The setting up of the SMTP call is now complete. Any subsequent errors are
2800 message-specific. */
2802 sx->setting_up = FALSE;
2805 if (sx->addrlist->prop.utf8_msg)
2809 /* If the transport sets a downconversion mode it overrides any set by ACL
2812 if ((s = ob->utf8_downconvert))
2814 if (!(s = expand_string(s)))
2816 message = string_sprintf("failed to expand utf8_downconvert: %s",
2817 expand_string_message);
2818 set_errno_nohost(sx->addrlist, ERRNO_EXPANDFAIL, message, DEFER, FALSE);
2824 case '1': sx->addrlist->prop.utf8_downcvt = TRUE;
2825 sx->addrlist->prop.utf8_downcvt_maybe = FALSE;
2827 case '0': sx->addrlist->prop.utf8_downcvt = FALSE;
2828 sx->addrlist->prop.utf8_downcvt_maybe = FALSE;
2830 case '-': if (s[1] == '1')
2832 sx->addrlist->prop.utf8_downcvt = FALSE;
2833 sx->addrlist->prop.utf8_downcvt_maybe = TRUE;
2839 sx->utf8_needed = !sx->addrlist->prop.utf8_downcvt
2840 && !sx->addrlist->prop.utf8_downcvt_maybe;
2841 DEBUG(D_transport) if (!sx->utf8_needed)
2842 debug_printf("utf8: %s downconvert\n",
2843 sx->addrlist->prop.utf8_downcvt ? "mandatory" : "optional");
2846 /* If this is an international message we need the host to speak SMTPUTF8 */
2847 if (sx->utf8_needed && !(sx->peer_offered & OPTION_UTF8))
2849 errno = ERRNO_UTF8_FWD;
2850 goto RESPONSE_FAILED;
2852 #endif /*SUPPORT_I18N*/
2861 if (errno == ECONNREFUSED) /* first-read error on a TFO conn */
2863 /* There is a testing facility for simulating a connection timeout, as I
2864 can't think of any other way of doing this. It converts a connection
2865 refused into a timeout if the timeout is set to 999999. This is done for
2866 a 3whs connection in ip_connect(), but a TFO connection does not error
2867 there - instead it gets ECONNREFUSED on the first data read. Tracking
2868 that a TFO really was done is too hard, or we would set a
2869 sx->pending_conn_done bit and test that in smtp_reap_banner() and
2870 smtp_reap_ehlo(). That would let us also add the conn-timeout to the
2873 if (f.running_in_test_harness && ob->connect_timeout == 999999)
2875 set_errno_nohost(sx->addrlist,
2876 errno == ETIMEDOUT ? ERRNO_CONNECTTIMEOUT : errno,
2877 sx->verify ? US strerror(errno) : NULL,
2879 sx->send_quit = FALSE;
2883 /* really an error on an SMTP read */
2885 sx->send_quit = check_response(sx->conn_args.host, &errno, sx->addrlist->more_errno,
2886 sx->buffer, &code, &message, &pass_message);
2892 message = US string_sprintf("send() to %s [%s] failed: %s",
2893 sx->conn_args.host->name, sx->conn_args.host->address, strerror(errno));
2894 sx->send_quit = FALSE;
2900 message = string_sprintf("Remote host closed connection in response to %s"
2901 " (EHLO response was: %s)", smtp_command, sx->buffer);
2902 sx->send_quit = FALSE;
2906 /* This label is jumped to directly when a TLS negotiation has failed,
2907 or was not done for a host for which it is required. Values will be set
2908 in message and errno, and setting_up will always be true. Treat as
2909 a temporary error. */
2913 code = '4', yield = DEFER;
2917 /* The failure happened while setting up the call; see if the failure was
2918 a 5xx response (this will either be on connection, or following HELO - a 5xx
2919 after EHLO causes it to try HELO). If so, and there are no more hosts to try,
2920 fail all addresses, as this host is never going to accept them. For other
2921 errors during setting up (timeouts or whatever), defer all addresses, and
2922 yield DEFER, so that the host is not tried again for a while.
2924 XXX This peeking for another host feels like a layering violation. We want
2925 to note the host as unusable, but down here we shouldn't know if this was
2926 the last host to try for the addr(list). Perhaps the upper layer should be
2927 the one to do set_errno() ? The problem is that currently the addr is where
2928 errno etc. are stashed, but until we run out of hosts to try the errors are
2929 host-specific. Maybe we should enhance the host_item definition? */
2932 sx->ok = FALSE; /* For when reached by GOTO */
2933 set_errno(sx->addrlist, errno, message,
2934 sx->conn_args.host->next
2938 || errno == ERRNO_UTF8_FWD
2942 errno == ECONNREFUSED ? NULL : sx->conn_args.host
2943 #ifdef EXPERIMENTAL_DSN_INFO
2944 , sx->smtp_greeting, sx->helo_response
2953 (void)smtp_write_command(sx, SCMD_FLUSH, "QUIT\r\n");
2956 if (sx->cctx.tls_ctx)
2958 tls_close(sx->cctx.tls_ctx, TLS_SHUTDOWN_NOWAIT);
2959 sx->cctx.tls_ctx = NULL;
2963 /* Close the socket, and return the appropriate value, first setting
2964 works because the NULL setting is passed back to the calling process, and
2965 remote_max_parallel is forced to 1 when delivering over an existing connection,
2968 HDEBUG(D_transport|D_acl|D_v) debug_printf_indent(" SMTP(close)>>\n");
2971 shutdown(sx->cctx.sock, SHUT_WR);
2972 if (fcntl(sx->cctx.sock, F_SETFL, O_NONBLOCK) == 0)
2973 for (int i = 16; read(sx->cctx.sock, sx->inbuffer, sizeof(sx->inbuffer)) > 0 && i > 0;)
2974 i--; /* drain socket */
2975 sx->send_quit = FALSE;
2977 (void)close(sx->cctx.sock);
2980 #ifndef DISABLE_EVENT
2981 (void) event_raise(sx->conn_args.tblock->event_action, US"tcp:close", NULL);
2984 continue_transport = NULL;
2985 continue_hostname = NULL;
2992 /* Create the string of options that will be appended to the MAIL FROM:
2993 in the connection context buffer */
2996 build_mailcmd_options(smtp_context * sx, address_item * addrlist)
2998 uschar * p = sx->buffer;
2999 address_item * addr;
3004 /* If we know the receiving MTA supports the SIZE qualification, and we know it,
3005 send it, adding something to the message size to allow for imprecision
3006 and things that get added en route. Exim keeps the number of lines
3007 in a message, so we can give an accurate value for the original message, but we
3008 need some additional to handle added headers. (Double "." characters don't get
3009 included in the count.) */
3011 if ( message_size > 0
3012 && sx->peer_offered & OPTION_SIZE && !(sx->avoid_option & OPTION_SIZE))
3014 /*XXX problem here under spool_files_wireformat?
3015 Or just forget about lines? Or inflate by a fixed proportion? */
3017 sprintf(CS p, " SIZE=%d", message_size+message_linecount+(SOB sx->conn_args.ob)->size_addition);
3021 #ifndef DISABLE_PRDR
3022 /* If it supports Per-Recipient Data Responses, and we have more than one recipient,
3025 sx->prdr_active = FALSE;
3026 if (sx->peer_offered & OPTION_PRDR)
3027 for (address_item * addr = addrlist; addr; addr = addr->next)
3028 if (addr->transport_return == PENDING_DEFER)
3030 for (addr = addr->next; addr; addr = addr->next)
3031 if (addr->transport_return == PENDING_DEFER)
3032 { /* at least two recipients to send */
3033 sx->prdr_active = TRUE;
3034 sprintf(CS p, " PRDR"); p += 5;
3042 /* If it supports internationalised messages, and this meesage need that,
3045 if ( sx->peer_offered & OPTION_UTF8
3046 && addrlist->prop.utf8_msg
3047 && !addrlist->prop.utf8_downcvt
3049 Ustrcpy(p, US" SMTPUTF8"), p += 9;
3052 /* check if all addresses have DSN-lasthop flag; do not send RET and ENVID if so */
3053 for (sx->dsn_all_lasthop = TRUE, addr = addrlist, address_count = 0;
3054 addr && address_count < sx->max_rcpt;
3055 addr = addr->next) if (addr->transport_return == PENDING_DEFER)
3058 if (!(addr->dsn_flags & rf_dsnlasthop))
3060 sx->dsn_all_lasthop = FALSE;
3065 /* Add any DSN flags to the mail command */
3067 if (sx->peer_offered & OPTION_DSN && !sx->dsn_all_lasthop)
3069 if (dsn_ret == dsn_ret_hdrs)
3070 { Ustrcpy(p, US" RET=HDRS"); p += 9; }
3071 else if (dsn_ret == dsn_ret_full)
3072 { Ustrcpy(p, US" RET=FULL"); p += 9; }
3076 string_format(p, sizeof(sx->buffer) - (p-sx->buffer), " ENVID=%s", dsn_envid);
3081 /* If an authenticated_sender override has been specified for this transport
3082 instance, expand it. If the expansion is forced to fail, and there was already
3083 an authenticated_sender for this message, the original value will be used.
3084 Other expansion failures are serious. An empty result is ignored, but there is
3085 otherwise no check - this feature is expected to be used with LMTP and other
3086 cases where non-standard addresses (e.g. without domains) might be required. */
3088 if (smtp_mail_auth_str(p, sizeof(sx->buffer) - (p-sx->buffer), addrlist, sx->conn_args.ob))
3096 build_rcptcmd_options(smtp_context * sx, const address_item * addr)
3098 uschar * p = sx->buffer;
3101 /* Add any DSN flags to the rcpt command */
3103 if (sx->peer_offered & OPTION_DSN && !(addr->dsn_flags & rf_dsnlasthop))
3105 if (addr->dsn_flags & rf_dsnflags)
3109 Ustrcpy(p, US" NOTIFY=");
3111 for (int i = 0; i < nelem(rf_list); i++) if (addr->dsn_flags & rf_list[i])
3113 if (!first) *p++ = ',';
3115 Ustrcpy(p, rf_names[i]);
3120 if (addr->dsn_orcpt)
3122 string_format(p, sizeof(sx->buffer) - (p-sx->buffer), " ORCPT=%s",
3133 0 good, rcpt results in addr->transport_return (PENDING_OK, DEFER, FAIL)
3134 -1 MAIL response error
3135 -2 any non-MAIL read i/o error
3136 -3 non-MAIL response timeout
3137 -4 internal error; channel still usable
3142 smtp_write_mail_and_rcpt_cmds(smtp_context * sx, int * yield)
3144 address_item * addr;
3148 if (build_mailcmd_options(sx, sx->first_addr) != OK)
3154 /* From here until we send the DATA command, we can make use of PIPELINING
3155 if the server host supports it. The code has to be able to check the responses
3156 at any point, for when the buffer fills up, so we write it totally generally.
3157 When PIPELINING is off, each command written reports that it has flushed the
3160 sx->pending_MAIL = TRUE; /* The block starts with MAIL */
3163 uschar * s = sx->from_addr;
3165 uschar * errstr = NULL;
3167 /* If we must downconvert, do the from-address here. Remember we had to
3168 for the to-addresses (done below), and also (ugly) for re-doing when building
3169 the delivery log line. */
3171 if ( sx->addrlist->prop.utf8_msg
3172 && (sx->addrlist->prop.utf8_downcvt || !(sx->peer_offered & OPTION_UTF8))
3175 if (s = string_address_utf8_to_alabel(s, &errstr), errstr)
3177 set_errno_nohost(sx->addrlist, ERRNO_EXPANDFAIL, errstr, DEFER, FALSE);
3181 setflag(sx->addrlist, af_utf8_downcvt);
3185 rc = smtp_write_command(sx, pipelining_active ? SCMD_BUFFER : SCMD_FLUSH,
3186 "MAIL FROM:<%s>%s\r\n", s, sx->buffer);
3189 mail_command = string_copy(big_buffer); /* Save for later error message */
3193 case -1: /* Transmission error */
3196 case +1: /* Cmd was sent */
3197 if (!smtp_read_response(sx, sx->buffer, sizeof(sx->buffer), '2',
3198 (SOB sx->conn_args.ob)->command_timeout))
3200 if (errno == 0 && sx->buffer[0] == '4')
3202 errno = ERRNO_MAIL4XX;
3203 sx->addrlist->more_errno |= ((sx->buffer[1] - '0')*10 + sx->buffer[2] - '0') << 8;
3207 sx->pending_MAIL = FALSE;
3210 /* otherwise zero: command queued for pipeline */
3213 /* Pass over all the relevant recipient addresses for this host, which are the
3214 ones that have status PENDING_DEFER. If we are using PIPELINING, we can send
3215 several before we have to read the responses for those seen so far. This
3216 checking is done by a subroutine because it also needs to be done at the end.
3217 Send only up to max_rcpt addresses at a time, leaving next_addr pointing to
3218 the next one if not all are sent.
3220 In the MUA wrapper situation, we want to flush the PIPELINING buffer for the
3221 last address because we want to abort if any recipients have any kind of
3222 problem, temporary or permanent. We know that all recipient addresses will have
3223 the PENDING_DEFER status, because only one attempt is ever made, and we know
3224 that max_rcpt will be large, so all addresses will be done at once.
3226 For verify we flush the pipeline after any (the only) rcpt address. */
3228 for (addr = sx->first_addr, address_count = 0;
3229 addr && address_count < sx->max_rcpt;
3230 addr = addr->next) if (addr->transport_return == PENDING_DEFER)
3236 addr->dsn_aware = sx->peer_offered & OPTION_DSN
3237 ? dsn_support_yes : dsn_support_no;
3240 no_flush = pipelining_active && !sx->verify
3241 && (!mua_wrapper || addr->next && address_count < sx->max_rcpt);
3243 build_rcptcmd_options(sx, addr);
3245 /* Now send the RCPT command, and process outstanding responses when
3246 necessary. After a timeout on RCPT, we just end the function, leaving the
3247 yield as OK, because this error can often mean that there is a problem with
3248 just one address, so we don't want to delay the host. */
3250 rcpt_addr = transport_rcpt_address(addr, sx->conn_args.tblock->rcpt_include_affixes);
3253 if ( testflag(sx->addrlist, af_utf8_downcvt)
3254 && !(rcpt_addr = string_address_utf8_to_alabel(rcpt_addr, NULL))
3257 /*XXX could we use a per-address errstr here? Not fail the whole send? */
3258 errno = ERRNO_EXPANDFAIL;
3259 return -5; /*XXX too harsh? */
3263 count = smtp_write_command(sx, no_flush ? SCMD_BUFFER : SCMD_FLUSH,
3264 "RCPT TO:<%s>%s%s\r\n", rcpt_addr, sx->igquotstr, sx->buffer);
3266 if (count < 0) return -5;
3269 switch(sync_responses(sx, count, 0))
3271 case 3: sx->ok = TRUE; /* 2xx & 5xx => OK & progress made */
3272 case 2: sx->completed_addr = TRUE; /* 5xx (only) => progress made */
3275 case 1: sx->ok = TRUE; /* 2xx (only) => OK, but if LMTP, */
3276 if (!sx->lmtp) /* can't tell about progress yet */
3277 sx->completed_addr = TRUE;
3278 case 0: /* No 2xx or 5xx, but no probs */
3281 case -1: return -3; /* Timeout on RCPT */
3282 case -2: return -2; /* non-MAIL read i/o error */
3283 default: return -1; /* any MAIL error */
3285 #ifdef SUPPORT_PIPE_CONNECT
3286 case -4: return -1; /* non-2xx for pipelined banner or EHLO */
3287 case -5: return -1; /* TLS first-read error */
3290 sx->pending_MAIL = FALSE; /* Dealt with MAIL */
3292 } /* Loop for next address */
3294 sx->next_addr = addr;
3300 /*****************************************************
3301 * Proxy TLS connection for another transport process *
3302 ******************************************************/
3304 Close the unused end of the pipe, fork once more, then use the given buffer
3305 as a staging area, and select on both the given fd and the TLS'd client-fd for
3306 data to read (per the coding in ip_recv() and fd_ready() this is legitimate).
3307 Do blocking full-size writes, and reads under a timeout. Once both input
3308 channels are closed, exit the process.
3312 buf space to use for buffering
3313 bufsiz size of buffer
3314 pfd pipe filedescriptor array; [0] is comms to proxied process
3315 timeout per-read timeout, seconds
3321 smtp_proxy_tls(void * ct_ctx, uschar * buf, size_t bsize, int * pfd,
3325 int max_fd = MAX(pfd[0], tls_out.active.sock) + 1;
3331 DEBUG(D_transport) debug_printf("proxy-proc final-pid %d\n", rc);
3332 _exit(rc < 0 ? EXIT_FAILURE : EXIT_SUCCESS);
3335 if (f.running_in_test_harness) millisleep(100); /* let parent debug out */
3336 set_process_info("proxying TLS connection for continued transport");
3338 FD_SET(tls_out.active.sock, &rfds);
3339 FD_SET(pfd[0], &rfds);
3341 for (int fd_bits = 3; fd_bits; )
3343 time_t time_left = timeout;
3344 time_t time_start = time(NULL);
3350 struct timeval tv = { time_left, 0 };
3353 (SELECT_ARG2_TYPE *)&rfds, NULL, (SELECT_ARG2_TYPE *)&efds, &tv);
3355 if (rc < 0 && errno == EINTR)
3356 if ((time_left -= time(NULL) - time_start) > 0) continue;
3360 DEBUG(D_transport) if (rc == 0) debug_printf("%s: timed out\n", __FUNCTION__);
3364 if (FD_ISSET(tls_out.active.sock, &efds) || FD_ISSET(pfd[0], &efds))
3366 DEBUG(D_transport) debug_printf("select: exceptional cond on %s fd\n",
3367 FD_ISSET(pfd[0], &efds) ? "proxy" : "tls");
3371 while (rc < 0 || !(FD_ISSET(tls_out.active.sock, &rfds) || FD_ISSET(pfd[0], &rfds)));
3373 /* handle inbound data */
3374 if (FD_ISSET(tls_out.active.sock, &rfds))
3375 if ((rc = tls_read(ct_ctx, buf, bsize)) <= 0)
3378 FD_CLR(tls_out.active.sock, &rfds);
3379 shutdown(pfd[0], SHUT_WR);
3384 for (int nbytes = 0; rc - nbytes > 0; nbytes += i)
3385 if ((i = write(pfd[0], buf + nbytes, rc - nbytes)) < 0) goto done;
3387 else if (fd_bits & 1)
3388 FD_SET(tls_out.active.sock, &rfds);
3390 /* handle outbound data */
3391 if (FD_ISSET(pfd[0], &rfds))
3392 if ((rc = read(pfd[0], buf, bsize)) <= 0)
3395 tls_close(ct_ctx, TLS_SHUTDOWN_NOWAIT);
3400 for (int nbytes = 0; rc - nbytes > 0; nbytes += i)
3401 if ((i = tls_write(ct_ctx, buf + nbytes, rc - nbytes, FALSE)) < 0)
3404 else if (fd_bits & 2)
3405 FD_SET(pfd[0], &rfds);
3409 if (f.running_in_test_harness) millisleep(100); /* let logging complete */
3410 exim_exit(0, US"TLS proxy");
3415 /*************************************************
3416 * Deliver address list to given host *
3417 *************************************************/
3419 /* If continue_hostname is not null, we get here only when continuing to
3420 deliver down an existing channel. The channel was passed as the standard
3421 input. TLS is never active on a passed channel; the previous process always
3422 closes it down before passing the connection on.
3424 Otherwise, we have to make a connection to the remote host, and do the
3425 initial protocol exchange.
3427 When running as an MUA wrapper, if the sender or any recipient is rejected,
3428 temporarily or permanently, we force failure for all recipients.
3431 addrlist chain of potential addresses to deliver; only those whose
3432 transport_return field is set to PENDING_DEFER are currently
3433 being processed; others should be skipped - they have either
3434 been delivered to an earlier host or IP address, or been
3435 failed by one of them.
3436 host host to deliver to
3437 host_af AF_INET or AF_INET6
3438 defport default TCP/IP port to use if host does not specify, in host
3440 interface interface to bind to, or NULL
3441 tblock transport instance block
3442 message_defer set TRUE if yield is OK, but all addresses were deferred
3443 because of a non-recipient, non-host failure, that is, a
3444 4xx response to MAIL FROM, DATA, or ".". This is a defer
3445 that is specific to the message.
3446 suppress_tls if TRUE, don't attempt a TLS connection - this is set for
3447 a second attempt after TLS initialization fails
3449 Returns: OK - the connection was made and the delivery attempted;
3450 the result for each address is in its data block.
3451 DEFER - the connection could not be made, or something failed
3452 while setting up the SMTP session, or there was a
3453 non-message-specific error, such as a timeout.
3454 ERROR - a filter command is specified for this transport,
3455 and there was a problem setting it up; OR helo_data
3456 or add_headers or authenticated_sender is specified
3457 for this transport, and the string failed to expand
3461 smtp_deliver(address_item *addrlist, host_item *host, int host_af, int defport,
3462 uschar *interface, transport_instance *tblock,
3463 BOOL *message_defer, BOOL suppress_tls)
3465 smtp_transport_options_block * ob = SOB tblock->options_block;
3469 struct timeval start_delivery_time;
3471 BOOL pass_message = FALSE;
3472 uschar *message = NULL;
3473 uschar new_message_id[MESSAGE_ID_LENGTH + 1];
3477 gettimeofday(&start_delivery_time, NULL);
3478 suppress_tls = suppress_tls; /* stop compiler warning when no TLS support */
3479 *message_defer = FALSE;
3481 sx.addrlist = addrlist;
3482 sx.conn_args.host = host;
3483 sx.conn_args.host_af = host_af,
3485 sx.conn_args.interface = interface;
3486 sx.helo_data = NULL;
3487 sx.conn_args.tblock = tblock;
3489 sx.sync_addr = sx.first_addr = addrlist;
3491 /* Get the channel set up ready for a message (MAIL FROM being the next
3492 SMTP command to send */
3494 if ((rc = smtp_setup_conn(&sx, suppress_tls)) != OK)
3497 /* If there is a filter command specified for this transport, we can now
3498 set it up. This cannot be done until the identify of the host is known. */
3500 if (tblock->filter_command)
3502 transport_filter_timeout = tblock->filter_timeout;
3504 /* On failure, copy the error to all addresses, abandon the SMTP call, and
3507 if (!transport_set_up_command(&transport_filter_argv,
3508 tblock->filter_command, TRUE, DEFER, addrlist,
3509 string_sprintf("%.50s transport", tblock->name), NULL))
3511 set_errno_nohost(addrlist->next, addrlist->basic_errno, addrlist->message, DEFER,
3517 if ( transport_filter_argv
3518 && *transport_filter_argv
3519 && **transport_filter_argv
3520 && sx.peer_offered & OPTION_CHUNKING
3523 sx.peer_offered &= ~OPTION_CHUNKING;
3524 DEBUG(D_transport) debug_printf("CHUNKING not usable due to transport filter\n");
3528 /* For messages that have more than the maximum number of envelope recipients,
3529 we want to send several transactions down the same SMTP connection. (See
3530 comments in deliver.c as to how this reconciles, heuristically, with
3531 remote_max_parallel.) This optimization was added to Exim after the following
3532 code was already working. The simplest way to put it in without disturbing the
3533 code was to use a goto to jump back to this point when there is another
3534 transaction to handle. */
3537 sx.from_addr = return_path;
3538 sx.sync_addr = sx.first_addr;
3540 sx.send_rset = TRUE;
3541 sx.completed_addr = FALSE;
3544 /* If we are a continued-connection-after-verify the MAIL and RCPT
3545 commands were already sent; do not re-send but do mark the addrs as
3546 having been accepted up to RCPT stage. A traditional cont-conn
3547 always has a sequence number greater than one. */
3549 if (continue_hostname && continue_sequence == 1)
3551 sx.peer_offered = smtp_peer_options;
3552 sx.pending_MAIL = FALSE;
3554 sx.next_addr = NULL;
3556 for (address_item * addr = addrlist; addr; addr = addr->next)
3557 addr->transport_return = PENDING_OK;
3561 /* Initiate a message transfer. */
3563 switch(smtp_write_mail_and_rcpt_cmds(&sx, &yield))
3566 case -1: case -2: goto RESPONSE_FAILED;
3567 case -3: goto END_OFF;
3568 case -4: goto SEND_QUIT;
3569 default: goto SEND_FAILED;
3572 /* If we are an MUA wrapper, abort if any RCPTs were rejected, either
3573 permanently or temporarily. We should have flushed and synced after the last
3581 for (a = sx.first_addr, cnt = 0; a && cnt < sx.max_rcpt; a = a->next, cnt++)
3582 if (a->transport_return != PENDING_OK)
3584 /*XXX could we find a better errno than 0 here? */
3585 set_errno_nohost(addrlist, 0, a->message, FAIL,
3586 testflag(a, af_pass_message));
3593 /* If ok is TRUE, we know we have got at least one good recipient, and must now
3594 send DATA, but if it is FALSE (in the normal, non-wrapper case), we may still
3595 have a good recipient buffered up if we are pipelining. We don't want to waste
3596 time sending DATA needlessly, so we only send it if either ok is TRUE or if we
3597 are pipelining. The responses are all handled by sync_responses().
3598 If using CHUNKING, do not send a BDAT until we know how big a chunk we want
3601 if ( !(sx.peer_offered & OPTION_CHUNKING)
3602 && (sx.ok || (pipelining_active && !mua_wrapper)))
3604 int count = smtp_write_command(&sx, SCMD_FLUSH, "DATA\r\n");
3606 if (count < 0) goto SEND_FAILED;
3607 switch(sync_responses(&sx, count, sx.ok ? +1 : -1))
3609 case 3: sx.ok = TRUE; /* 2xx & 5xx => OK & progress made */
3610 case 2: sx.completed_addr = TRUE; /* 5xx (only) => progress made */
3613 case 1: sx.ok = TRUE; /* 2xx (only) => OK, but if LMTP, */
3614 if (!sx.lmtp) sx.completed_addr = TRUE; /* can't tell about progress yet */
3615 case 0: break; /* No 2xx or 5xx, but no probs */
3617 case -1: goto END_OFF; /* Timeout on RCPT */
3619 #ifdef SUPPORT_PIPE_CONNECT
3620 case -5: /* TLS first-read error */
3621 case -4: HDEBUG(D_transport)
3622 debug_printf("failed reaping pipelined cmd responses\n");
3624 default: goto RESPONSE_FAILED; /* I/O error, or any MAIL/DATA error */
3626 pipelining_active = FALSE;
3627 data_command = string_copy(big_buffer); /* Save for later error message */
3630 /* If there were no good recipients (but otherwise there have been no
3631 problems), just set ok TRUE, since we have handled address-specific errors
3632 already. Otherwise, it's OK to send the message. Use the check/escape mechanism
3633 for handling the SMTP dot-handling protocol, flagging to apply to headers as
3634 well as body. Set the appropriate timeout value to be used for each chunk.
3635 (Haven't been able to make it work using select() for writing yet.) */
3637 if (!(sx.peer_offered & OPTION_CHUNKING) && !sx.ok)
3639 /* Save the first address of the next batch. */
3640 sx.first_addr = sx.next_addr;
3646 transport_ctx tctx = {
3647 .u = {.fd = sx.cctx.sock}, /*XXX will this need TLS info? */
3650 .check_string = US".",
3651 .escape_string = US"..", /* Escaping strings */
3653 topt_use_crlf | topt_escape_headers
3654 | (tblock->body_only ? topt_no_headers : 0)
3655 | (tblock->headers_only ? topt_no_body : 0)
3656 | (tblock->return_path_add ? topt_add_return_path : 0)
3657 | (tblock->delivery_date_add ? topt_add_delivery_date : 0)
3658 | (tblock->envelope_to_add ? topt_add_envelope_to : 0)
3661 /* If using CHUNKING we need a callback from the generic transport
3662 support to us, for the sending of BDAT smtp commands and the reaping
3663 of responses. The callback needs a whole bunch of state so set up
3664 a transport-context structure to be passed around. */
3666 if (sx.peer_offered & OPTION_CHUNKING)
3668 tctx.check_string = tctx.escape_string = NULL;
3669 tctx.options |= topt_use_bdat;
3670 tctx.chunk_cb = smtp_chunk_cmd_callback;
3671 sx.pending_BDAT = FALSE;
3672 sx.good_RCPT = sx.ok;
3674 tctx.smtp_context = &sx;
3677 tctx.options |= topt_end_dot;
3679 /* Save the first address of the next batch. */
3680 sx.first_addr = sx.next_addr;
3682 /* Responses from CHUNKING commands go in buffer. Otherwise,
3683 there has not been a response. */
3687 sigalrm_seen = FALSE;
3688 transport_write_timeout = ob->data_timeout;
3689 smtp_command = US"sending data block"; /* For error messages */
3690 DEBUG(D_transport|D_v)
3691 if (sx.peer_offered & OPTION_CHUNKING)
3692 debug_printf(" will write message using CHUNKING\n");
3694 debug_printf(" SMTP>> writing message and terminating \".\"\n");
3695 transport_count = 0;
3697 #ifndef DISABLE_DKIM
3698 dkim_exim_sign_init();
3699 # ifdef EXPERIMENTAL_ARC
3701 uschar * s = ob->arc_sign;
3704 if (!(ob->dkim.arc_signspec = s = expand_string(s)))
3706 if (!f.expand_string_forcedfail)
3708 message = US"failed to expand arc_sign";
3715 /* Ask dkim code to hash the body for ARC */
3716 (void) arc_ams_setup_sign_bodyhash();
3717 ob->dkim.force_bodyhash = TRUE;
3722 sx.ok = dkim_transport_write_message(&tctx, &ob->dkim, CUSS &message);
3724 sx.ok = transport_write_message(&tctx, 0);
3727 /* transport_write_message() uses write() because it is called from other
3728 places to write to non-sockets. This means that under some OS (e.g. Solaris)
3729 it can exit with "Broken pipe" as its error. This really means that the
3730 socket got closed at the far end. */
3732 transport_write_timeout = 0; /* for subsequent transports */
3734 /* Failure can either be some kind of I/O disaster (including timeout),
3735 or the failure of a transport filter or the expansion of added headers.
3736 Or, when CHUNKING, it can be a protocol-detected failure. */
3739 if (message) goto SEND_FAILED;
3740 else goto RESPONSE_FAILED;
3742 /* We used to send the terminating "." explicitly here, but because of
3743 buffering effects at both ends of TCP/IP connections, you don't gain
3744 anything by keeping it separate, so it might as well go in the final
3745 data buffer for efficiency. This is now done by setting the topt_end_dot
3748 smtp_command = US"end of data";
3750 if (sx.peer_offered & OPTION_CHUNKING && sx.cmd_count > 1)
3752 /* Reap any outstanding MAIL & RCPT commands, but not a DATA-go-ahead */
3753 switch(sync_responses(&sx, sx.cmd_count-1, 0))
3755 case 3: sx.ok = TRUE; /* 2xx & 5xx => OK & progress made */
3756 case 2: sx.completed_addr = TRUE; /* 5xx (only) => progress made */
3759 case 1: sx.ok = TRUE; /* 2xx (only) => OK, but if LMTP, */
3760 if (!sx.lmtp) sx.completed_addr = TRUE; /* can't tell about progress yet */
3761 case 0: break; /* No 2xx or 5xx, but no probs */
3763 case -1: goto END_OFF; /* Timeout on RCPT */
3765 #ifdef SUPPORT_PIPE_CONNECT
3766 case -5: /* TLS first-read error */
3767 case -4: HDEBUG(D_transport)
3768 debug_printf("failed reaping pipelined cmd responses\n");
3770 default: goto RESPONSE_FAILED; /* I/O error, or any MAIL/DATA error */
3774 #ifndef DISABLE_PRDR
3775 /* For PRDR we optionally get a partial-responses warning followed by the
3776 individual responses, before going on with the overall response. If we don't
3777 get the warning then deal with per non-PRDR. */
3781 sx.ok = smtp_read_response(&sx, sx.buffer, sizeof(sx.buffer), '3', ob->final_timeout);
3782 if (!sx.ok && errno == 0) switch(sx.buffer[0])
3784 case '2': sx.prdr_active = FALSE;
3787 case '4': errno = ERRNO_DATA4XX;
3788 addrlist->more_errno |=
3789 ((sx.buffer[1] - '0')*10 + sx.buffer[2] - '0') << 8;
3796 /* For non-PRDR SMTP, we now read a single response that applies to the
3797 whole message. If it is OK, then all the addresses have been delivered. */
3801 sx.ok = smtp_read_response(&sx, sx.buffer, sizeof(sx.buffer), '2',
3803 if (!sx.ok && errno == 0 && sx.buffer[0] == '4')
3805 errno = ERRNO_DATA4XX;
3806 addrlist->more_errno |= ((sx.buffer[1] - '0')*10 + sx.buffer[2] - '0') << 8;
3810 /* For LMTP, we get back a response for every RCPT command that we sent;
3811 some may be accepted and some rejected. For those that get a response, their
3812 status is fixed; any that are accepted have been handed over, even if later
3813 responses crash - at least, that's how I read RFC 2033.
3815 If all went well, mark the recipient addresses as completed, record which
3816 host/IPaddress they were delivered to, and cut out RSET when sending another
3817 message down the same channel. Write the completed addresses to the journal
3818 now so that they are recorded in case there is a crash of hardware or
3819 software before the spool gets updated. Also record the final SMTP
3820 confirmation if needed (for SMTP only). */
3825 struct timeval delivery_time;
3827 uschar * conf = NULL;
3829 timesince(&delivery_time, &start_delivery_time);
3830 sx.send_rset = FALSE;
3831 pipelining_active = FALSE;
3833 /* Set up confirmation if needed - applies only to SMTP */
3836 #ifdef DISABLE_EVENT
3837 LOGGING(smtp_confirmation) &&
3842 const uschar *s = string_printing(sx.buffer);
3843 /* deconst cast ok here as string_printing was checked to have alloc'n'copied */
3844 conf = (s == sx.buffer)? US string_copy(s) : US s;
3847 /* Process all transported addresses - for LMTP or PRDR, read a status for
3850 for (address_item * addr = addrlist; addr != sx.first_addr; addr = addr->next)
3852 if (addr->transport_return != PENDING_OK) continue;
3854 /* LMTP - if the response fails badly (e.g. timeout), use it for all the
3855 remaining addresses. Otherwise, it's a return code for just the one
3856 address. For temporary errors, add a retry item for the address so that
3857 it doesn't get tried again too soon. */
3859 #ifndef DISABLE_PRDR
3860 if (sx.lmtp || sx.prdr_active)
3865 if (!smtp_read_response(&sx, sx.buffer, sizeof(sx.buffer), '2',
3868 if (errno != 0 || sx.buffer[0] == 0) goto RESPONSE_FAILED;
3869 addr->message = string_sprintf(
3870 #ifndef DISABLE_PRDR
3871 "%s error after %s: %s", sx.prdr_active ? "PRDR":"LMTP",
3873 "LMTP error after %s: %s",
3875 data_command, string_printing(sx.buffer));
3876 setflag(addr, af_pass_message); /* Allow message to go to user */
3877 if (sx.buffer[0] == '5')
3878 addr->transport_return = FAIL;
3881 errno = ERRNO_DATA4XX;
3882 addr->more_errno |= ((sx.buffer[1] - '0')*10 + sx.buffer[2] - '0') << 8;
3883 addr->transport_return = DEFER;
3884 #ifndef DISABLE_PRDR
3885 if (!sx.prdr_active)
3887 retry_add_item(addr, addr->address_retry_key, 0);
3891 sx.completed_addr = TRUE; /* NOW we can set this flag */
3892 if (LOGGING(smtp_confirmation))
3894 const uschar *s = string_printing(sx.buffer);
3895 /* deconst cast ok here as string_printing was checked to have alloc'n'copied */
3896 conf = (s == sx.buffer) ? US string_copy(s) : US s;
3900 /* SMTP, or success return from LMTP for this address. Pass back the
3901 actual host that was used. */
3903 addr->transport_return = OK;
3904 addr->more_errno = delivery_time.tv_sec;
3905 addr->delivery_usec = delivery_time.tv_usec;
3906 addr->host_used = host;
3907 addr->special_action = flag;
3908 addr->message = conf;
3910 if (tcp_out_fastopen)
3912 setflag(addr, af_tcp_fastopen_conn);
3913 if (tcp_out_fastopen >= TFO_USED_NODATA) setflag(addr, af_tcp_fastopen);
3914 if (tcp_out_fastopen >= TFO_USED_DATA) setflag(addr, af_tcp_fastopen_data);
3916 if (sx.pipelining_used) setflag(addr, af_pipelining);
3917 #ifdef SUPPORT_PIPE_CONNECT
3918 if (sx.early_pipe_active) setflag(addr, af_early_pipe);
3920 #ifndef DISABLE_PRDR
3921 if (sx.prdr_active) setflag(addr, af_prdr_used);
3923 if (sx.peer_offered & OPTION_CHUNKING) setflag(addr, af_chunking_used);
3926 #ifndef DISABLE_PRDR
3927 if (!sx.prdr_active)
3930 /* Update the journal. For homonymic addresses, use the base address plus
3931 the transport name. See lots of comments in deliver.c about the reasons
3932 for the complications when homonyms are involved. Just carry on after
3933 write error, as it may prove possible to update the spool file later. */
3935 if (testflag(addr, af_homonym))
3936 sprintf(CS sx.buffer, "%.500s/%s\n", addr->unique + 3, tblock->name);
3938 sprintf(CS sx.buffer, "%.500s\n", addr->unique);
3940 DEBUG(D_deliver) debug_printf("S:journalling %s\n", sx.buffer);
3941 len = Ustrlen(CS sx.buffer);
3942 if (write(journal_fd, sx.buffer, len) != len)
3943 log_write(0, LOG_MAIN|LOG_PANIC, "failed to write journal for "
3944 "%s: %s", sx.buffer, strerror(errno));
3948 #ifndef DISABLE_PRDR
3951 const uschar * overall_message;
3953 /* PRDR - get the final, overall response. For any non-success
3954 upgrade all the address statuses. */
3956 sx.ok = smtp_read_response(&sx, sx.buffer, sizeof(sx.buffer), '2',
3960 if(errno == 0 && sx.buffer[0] == '4')
3962 errno = ERRNO_DATA4XX;
3963 addrlist->more_errno |= ((sx.buffer[1] - '0')*10 + sx.buffer[2] - '0') << 8;
3965 for (address_item * addr = addrlist; addr != sx.first_addr; addr = addr->next)
3966 if (sx.buffer[0] == '5' || addr->transport_return == OK)
3967 addr->transport_return = PENDING_OK; /* allow set_errno action */
3968 goto RESPONSE_FAILED;
3971 /* Append the overall response to the individual PRDR response for logging
3972 and update the journal, or setup retry. */
3974 overall_message = string_printing(sx.buffer);
3975 for (address_item * addr = addrlist; addr != sx.first_addr; addr = addr->next)
3976 if (addr->transport_return == OK)
3977 addr->message = string_sprintf("%s\\n%s", addr->message, overall_message);
3979 for (address_item * addr = addrlist; addr != sx.first_addr; addr = addr->next)
3980 if (addr->transport_return == OK)
3982 if (testflag(addr, af_homonym))
3983 sprintf(CS sx.buffer, "%.500s/%s\n", addr->unique + 3, tblock->name);
3985 sprintf(CS sx.buffer, "%.500s\n", addr->unique);
3987 DEBUG(D_deliver) debug_printf("journalling(PRDR) %s\n", sx.buffer);
3988 len = Ustrlen(CS sx.buffer);
3989 if (write(journal_fd, sx.buffer, len) != len)
3990 log_write(0, LOG_MAIN|LOG_PANIC, "failed to write journal for "
3991 "%s: %s", sx.buffer, strerror(errno));
3993 else if (addr->transport_return == DEFER)
3994 retry_add_item(addr, addr->address_retry_key, -2);
3998 /* Ensure the journal file is pushed out to disk. */
4000 if (EXIMfsync(journal_fd) < 0)
4001 log_write(0, LOG_MAIN|LOG_PANIC, "failed to fsync journal: %s",
4007 /* Handle general (not specific to one address) failures here. The value of ok
4008 is used to skip over this code on the falling through case. A timeout causes a
4009 deferral. Other errors may defer or fail according to the response code, and
4010 may set up a special errno value, e.g. after connection chopped, which is
4011 assumed if errno == 0 and there is no text in the buffer. If control reaches
4012 here during the setting up phase (i.e. before MAIL FROM) then always defer, as
4013 the problem is not related to this specific message. */
4018 uschar * set_message;
4024 sx.send_quit = check_response(host, &save_errno, addrlist->more_errno,
4025 sx.buffer, &code, &message, &pass_message);
4033 message = string_sprintf("send() to %s [%s] failed: %s",
4034 host->name, host->address, message ? message : US strerror(save_errno));
4035 sx.send_quit = FALSE;
4043 sx.ok = FALSE; /* For when reached by GOTO */
4044 set_message = message;
4046 /* We want to handle timeouts after MAIL or "." and loss of connection after
4047 "." specially. They can indicate a problem with the sender address or with
4048 the contents of the message rather than a real error on the connection. These
4049 cases are treated in the same way as a 4xx response. This next bit of code
4050 does the classification. */
4057 message_error = TRUE;
4061 message_error = Ustrncmp(smtp_command,"MAIL",4) == 0 ||
4062 Ustrncmp(smtp_command,"end ",4) == 0;
4065 case ERRNO_SMTPCLOSED:
4066 message_error = Ustrncmp(smtp_command,"end ",4) == 0;
4070 message_error = FALSE;
4074 /* Handle the cases that are treated as message errors. These are:
4076 (a) negative response or timeout after MAIL
4077 (b) negative response after DATA
4078 (c) negative response or timeout or dropped connection after "."
4079 (d) utf8 support required and not offered
4081 It won't be a negative response or timeout after RCPT, as that is dealt
4082 with separately above. The action in all cases is to set an appropriate
4083 error code for all the addresses, but to leave yield set to OK because the
4084 host itself has not failed. Of course, it might in practice have failed
4085 when we've had a timeout, but if so, we'll discover that at the next
4086 delivery attempt. For a temporary error, set the message_defer flag, and
4087 write to the logs for information if this is not the last host. The error
4088 for the last host will be logged as part of the address's log line. */
4092 if (mua_wrapper) code = '5'; /* Force hard failure in wrapper mode */
4094 /* If there's an errno, the message contains just the identity of
4099 else /* Anything other than 5 is treated as temporary */
4103 message = US string_sprintf("%s: %s", message, strerror(save_errno));
4105 write_logs(host, message, sx.first_addr ? sx.first_addr->basic_errno : 0);
4107 *message_defer = TRUE;
4111 /* Otherwise, we have an I/O error or a timeout other than after MAIL or
4112 ".", or some other transportation error. We defer all addresses and yield
4113 DEFER, except for the case of failed add_headers expansion, or a transport
4114 filter failure, when the yield should be ERROR, to stop it trying other
4119 #ifdef SUPPORT_PIPE_CONNECT
4120 /* If we were early-pipelinng and the actual EHLO response did not match
4121 the cached value we assumed, we could have detected it and passed a
4122 custom errno through to here. It would be nice to RSET and retry right
4123 away, but to reliably do that we eould need an extra synch point before
4124 we committed to data and that would discard half the gained roundrips.
4125 Or we could summarily drop the TCP connection. but that is also ugly.
4126 Instead, we ignore the possibility (having freshened the cache) and rely
4127 on the server telling us with a nonmessage error if we have tried to
4128 do something it no longer supports. */
4131 yield = (save_errno == ERRNO_CHHEADER_FAIL ||
4132 save_errno == ERRNO_FILTER_FAIL) ? ERROR : DEFER;
4136 set_errno(addrlist, save_errno, set_message, set_rc, pass_message, host
4137 #ifdef EXPERIMENTAL_DSN_INFO
4138 , sx.smtp_greeting, sx.helo_response
4144 /* If all has gone well, send_quit will be set TRUE, implying we can end the
4145 SMTP session tidily. However, if there were too many addresses to send in one
4146 message (indicated by first_addr being non-NULL) we want to carry on with the
4147 rest of them. Also, it is desirable to send more than one message down the SMTP
4148 connection if there are several waiting, provided we haven't already sent so
4149 many as to hit the configured limit. The function transport_check_waiting looks
4150 for a waiting message and returns its id. Then transport_pass_socket tries to
4151 set up a continued delivery by passing the socket on to another process. The
4152 variable send_rset is FALSE if a message has just been successfully transferred.
4154 If we are already sending down a continued channel, there may be further
4155 addresses not yet delivered that are aimed at the same host, but which have not
4156 been passed in this run of the transport. In this case, continue_more will be
4157 true, and all we should do is send RSET if necessary, and return, leaving the
4160 However, if no address was disposed of, i.e. all addresses got 4xx errors, we
4161 do not want to continue with other messages down the same channel, because that
4162 can lead to looping between two or more messages, all with the same,
4163 temporarily failing address(es). [The retry information isn't updated yet, so
4164 new processes keep on trying.] We probably also don't want to try more of this
4165 message's addresses either.
4167 If we have started a TLS session, we have to end it before passing the
4168 connection to a new process. However, not all servers can handle this (Exim
4169 can), so we do not pass such a connection on if the host matches
4170 hosts_nopass_tls. */
4173 debug_printf("ok=%d send_quit=%d send_rset=%d continue_more=%d "
4174 "yield=%d first_address is %sNULL\n", sx.ok, sx.send_quit,
4175 sx.send_rset, f.continue_more, yield, sx.first_addr ? "not " : "");
4177 if (sx.completed_addr && sx.ok && sx.send_quit)
4180 smtp_compare_t t_compare;
4182 t_compare.tblock = tblock;
4183 t_compare.current_sender_address = sender_address;
4185 if ( sx.first_addr != NULL
4189 ( tls_out.active.sock < 0 && !continue_proxy_cipher
4190 || verify_check_given_host(CUSS &ob->hosts_nopass_tls, host) != OK
4194 transport_check_waiting(tblock->name, host->name,
4195 tblock->connection_max_messages, new_message_id, &more,
4196 (oicf)smtp_are_same_identities, (void*)&t_compare)
4203 if (! (sx.ok = smtp_write_command(&sx, SCMD_FLUSH, "RSET\r\n") >= 0))
4205 msg = US string_sprintf("send() to %s [%s] failed: %s", host->name,
4206 host->address, strerror(errno));
4207 sx.send_quit = FALSE;
4209 else if (! (sx.ok = smtp_read_response(&sx, sx.buffer, sizeof(sx.buffer),
4210 '2', ob->command_timeout)))
4213 sx.send_quit = check_response(host, &errno, 0, sx.buffer, &code, &msg,
4217 DEBUG(D_transport) debug_printf("H=%s [%s] %s\n",
4218 host->name, host->address, msg);
4222 /* Either RSET was not needed, or it succeeded */
4229 int socket_fd = sx.cctx.sock;
4232 if (sx.first_addr != NULL) /* More addresses still to be sent */
4233 { /* in this run of the transport */
4234 continue_sequence++; /* Causes * in logging */
4238 /* Unless caller said it already has more messages listed for this host,
4239 pass the connection on to a new Exim process (below, the call to
4240 transport_pass_socket). If the caller has more ready, just return with
4241 the connection still open. */
4244 if (tls_out.active.sock >= 0)
4245 if ( f.continue_more
4246 || verify_check_given_host(CUSS &ob->hosts_noproxy_tls, host) == OK)
4248 /* Before passing the socket on, or returning to caller with it still
4249 open, we must shut down TLS. Not all MTAs allow for the continuation
4250 of the SMTP session when TLS is shut down. We test for this by sending
4251 a new EHLO. If we don't get a good response, we don't attempt to pass
4254 tls_close(sx.cctx.tls_ctx, TLS_SHUTDOWN_WAIT);
4255 sx.cctx.tls_ctx = NULL;
4256 smtp_peer_options = smtp_peer_options_wrap;
4258 && smtp_write_command(&sx, SCMD_FLUSH, "EHLO %s\r\n", sx.helo_data)
4260 && smtp_read_response(&sx, sx.buffer, sizeof(sx.buffer),
4261 '2', ob->command_timeout);
4263 if (sx.ok && f.continue_more)
4264 return yield; /* More addresses for another run */
4268 /* Set up a pipe for proxying TLS for the new transport process */
4270 smtp_peer_options |= OPTION_TLS;
4271 if (sx.ok = (socketpair(AF_UNIX, SOCK_STREAM, 0, pfd) == 0))
4274 set_errno(sx.first_addr, errno, US"internal allocation problem",
4276 # ifdef EXPERIMENTAL_DSN_INFO
4277 , sx.smtp_greeting, sx.helo_response
4283 if (f.continue_more)
4284 return yield; /* More addresses for another run */
4286 /* If the socket is successfully passed, we mustn't send QUIT (or
4287 indeed anything!) from here. */
4289 /*XXX DSN_INFO: assume likely to do new HELO; but for greet we'll want to
4290 propagate it from the initial
4292 if (sx.ok && transport_pass_socket(tblock->name, host->name,
4293 host->address, new_message_id, socket_fd))
4295 sx.send_quit = FALSE;
4297 /* We have passed the client socket to a fresh transport process.
4298 If TLS is still active, we need to proxy it for the transport we
4299 just passed the baton to. Fork a child to to do it, and return to
4300 get logging done asap. Which way to place the work makes assumptions
4301 about post-fork prioritisation which may not hold on all platforms. */
4303 if (tls_out.active.sock >= 0)
4306 if (pid == 0) /* child; fork again to disconnect totally */
4308 if (f.running_in_test_harness) millisleep(100); /* let parent debug out */
4309 /* does not return */
4310 smtp_proxy_tls(sx.cctx.tls_ctx, sx.buffer, sizeof(sx.buffer), pfd,
4311 ob->command_timeout);
4314 if (pid > 0) /* parent */
4316 DEBUG(D_transport) debug_printf("proxy-proc inter-pid %d\n", pid);
4318 /* tidy the inter-proc to disconn the proxy proc */
4319 waitpid(pid, NULL, 0);
4320 tls_close(sx.cctx.tls_ctx, TLS_NO_SHUTDOWN);
4321 sx.cctx.tls_ctx = NULL;
4322 (void)close(sx.cctx.sock);
4324 continue_transport = NULL;
4325 continue_hostname = NULL;
4328 log_write(0, LOG_PANIC_DIE, "fork failed");
4334 /* If RSET failed and there are addresses left, they get deferred. */
4336 set_errno(sx.first_addr, errno, msg, DEFER, FALSE, host
4337 #ifdef EXPERIMENTAL_DSN_INFO
4338 , sx.smtp_greeting, sx.helo_response
4344 /* End off tidily with QUIT unless the connection has died or the socket has
4345 been passed to another process. There has been discussion on the net about what
4346 to do after sending QUIT. The wording of the RFC suggests that it is necessary
4347 to wait for a response, but on the other hand, there isn't anything one can do
4348 with an error response, other than log it. Exim used to do that. However,
4349 further discussion suggested that it is positively advantageous not to wait for
4350 the response, but to close the session immediately. This is supposed to move
4351 the TCP/IP TIME_WAIT state from the server to the client, thereby removing some
4352 load from the server. (Hosts that are both servers and clients may not see much
4353 difference, of course.) Further discussion indicated that this was safe to do
4354 on Unix systems which have decent implementations of TCP/IP that leave the
4355 connection around for a while (TIME_WAIT) after the application has gone away.
4356 This enables the response sent by the server to be properly ACKed rather than
4357 timed out, as can happen on broken TCP/IP implementations on other OS.
4359 This change is being made on 31-Jul-98. After over a year of trouble-free
4360 operation, the old commented-out code was removed on 17-Sep-99. */
4364 (void) setsockopt(sx.cctx.sock, IPPROTO_TCP, TCP_CORK, US &on, sizeof(on));
4366 if (sx.send_quit) (void)smtp_write_command(&sx, SCMD_FLUSH, "QUIT\r\n");
4371 tls_close(sx.cctx.tls_ctx, TLS_SHUTDOWN_NOWAIT);
4372 sx.cctx.tls_ctx = NULL;
4375 /* Close the socket, and return the appropriate value, first setting
4376 works because the NULL setting is passed back to the calling process, and
4377 remote_max_parallel is forced to 1 when delivering over an existing connection,
4379 If all went well and continue_more is set, we shouldn't actually get here if
4380 there are further addresses, as the return above will be taken. However,
4381 writing RSET might have failed, or there may be other addresses whose hosts are
4382 specified in the transports, and therefore not visible at top level, in which
4383 case continue_more won't get set. */
4385 HDEBUG(D_transport|D_acl|D_v) debug_printf_indent(" SMTP(close)>>\n");
4388 shutdown(sx.cctx.sock, SHUT_WR);
4389 millisleep(f.running_in_test_harness ? 200 : 20);
4390 if (fcntl(sx.cctx.sock, F_SETFL, O_NONBLOCK) == 0)
4391 for (int i = 16; read(sx.cctx.sock, sx.inbuffer, sizeof(sx.inbuffer)) > 0 && i > 0;)
4392 i--; /* drain socket */
4394 (void)close(sx.cctx.sock);
4396 #ifndef DISABLE_EVENT
4397 (void) event_raise(tblock->event_action, US"tcp:close", NULL);
4400 continue_transport = NULL;
4401 continue_hostname = NULL;
4408 /*************************************************
4409 * Closedown entry point *
4410 *************************************************/
4412 /* This function is called when exim is passed an open smtp channel
4413 from another incarnation, but the message which it has been asked
4414 to deliver no longer exists. The channel is on stdin.
4416 We might do fancy things like looking for another message to send down
4417 the channel, but if the one we sought has gone, it has probably been
4418 delivered by some other process that itself will seek further messages,
4419 so just close down our connection.
4421 Argument: pointer to the transport instance block
4426 smtp_transport_closedown(transport_instance *tblock)
4428 smtp_transport_options_block * ob = SOB tblock->options_block;
4429 client_conn_ctx cctx;
4432 uschar inbuffer[4096];
4433 uschar outbuffer[16];
4435 /*XXX really we need an active-smtp-client ctx, rather than assuming stdout */
4436 cctx.sock = fileno(stdin);
4437 cctx.tls_ctx = cctx.sock == tls_out.active.sock ? tls_out.active.tls_ctx : NULL;
4439 sx.inblock.cctx = &cctx;
4440 sx.inblock.buffer = inbuffer;
4441 sx.inblock.buffersize = sizeof(inbuffer);
4442 sx.inblock.ptr = inbuffer;
4443 sx.inblock.ptrend = inbuffer;
4445 sx.outblock.cctx = &cctx;
4446 sx.outblock.buffersize = sizeof(outbuffer);
4447 sx.outblock.buffer = outbuffer;
4448 sx.outblock.ptr = outbuffer;
4449 sx.outblock.cmd_count = 0;
4450 sx.outblock.authenticating = FALSE;
4452 (void)smtp_write_command(&sx, SCMD_FLUSH, "QUIT\r\n");
4453 (void)smtp_read_response(&sx, buffer, sizeof(buffer), '2', ob->command_timeout);
4454 (void)close(cctx.sock);
4459 /*************************************************
4460 * Prepare addresses for delivery *
4461 *************************************************/
4463 /* This function is called to flush out error settings from previous delivery
4464 attempts to other hosts. It also records whether we got here via an MX record
4465 or not in the more_errno field of the address. We are interested only in
4466 addresses that are still marked DEFER - others may have got delivered to a
4467 previously considered IP address. Set their status to PENDING_DEFER to indicate
4468 which ones are relevant this time.
4471 addrlist the list of addresses
4472 host the host we are delivering to
4474 Returns: the first address for this delivery
4477 static address_item *
4478 prepare_addresses(address_item *addrlist, host_item *host)
4480 address_item *first_addr = NULL;
4481 for (address_item * addr = addrlist; addr; addr = addr->next)
4482 if (addr->transport_return == DEFER)
4484 if (!first_addr) first_addr = addr;
4485 addr->transport_return = PENDING_DEFER;
4486 addr->basic_errno = 0;
4487 addr->more_errno = (host->mx >= 0)? 'M' : 'A';
4488 addr->message = NULL;
4490 addr->cipher = NULL;
4491 addr->ourcert = NULL;
4492 addr->peercert = NULL;
4493 addr->peerdn = NULL;
4494 addr->ocsp = OCSP_NOT_REQ;
4496 #ifdef EXPERIMENTAL_DSN_INFO
4497 addr->smtp_greeting = NULL;
4498 addr->helo_response = NULL;
4506 /*************************************************
4507 * Main entry point *
4508 *************************************************/
4510 /* See local README for interface details. As this is a remote transport, it is
4511 given a chain of addresses to be delivered in one connection, if possible. It
4512 always returns TRUE, indicating that each address has its own independent
4513 status set, except if there is a setting up problem, in which case it returns
4517 smtp_transport_entry(
4518 transport_instance *tblock, /* data for this instantiation */
4519 address_item *addrlist) /* addresses we are working on */
4522 int hosts_defer = 0;
4524 int hosts_looked_up = 0;
4525 int hosts_retry = 0;
4526 int hosts_serial = 0;
4527 int hosts_total = 0;
4528 int total_hosts_tried = 0;
4529 BOOL expired = TRUE;
4530 uschar *expanded_hosts = NULL;
4532 uschar *tid = string_sprintf("%s transport", tblock->name);
4533 smtp_transport_options_block *ob = SOB tblock->options_block;
4534 host_item *hostlist = addrlist->host_list;
4535 host_item *host = NULL;
4539 debug_printf("%s transport entered\n", tblock->name);
4540 for (address_item * addr = addrlist; addr; addr = addr->next)
4541 debug_printf(" %s\n", addr->address);
4544 debug_printf("hostlist:\n");
4545 for (host_item * host = hostlist; host; host = host->next)
4546 debug_printf(" '%s' IP %s port %d\n", host->name, host->address, host->port);
4548 if (continue_hostname)
4549 debug_printf("already connected to %s [%s] (on fd %d)\n",
4550 continue_hostname, continue_host_address,
4551 cutthrough.cctx.sock >= 0 ? cutthrough.cctx.sock : 0);
4554 /* Set the flag requesting that these hosts be added to the waiting
4555 database if the delivery fails temporarily or if we are running with
4556 queue_smtp or a 2-stage queue run. This gets unset for certain
4557 kinds of error, typically those that are specific to the message. */
4559 update_waiting = TRUE;
4561 /* If a host list is not defined for the addresses - they must all have the
4562 same one in order to be passed to a single transport - or if the transport has
4563 a host list with hosts_override set, use the host list supplied with the
4564 transport. It is an error for this not to exist. */
4566 if (!hostlist || (ob->hosts_override && ob->hosts))
4570 addrlist->message = string_sprintf("%s transport called with no hosts set",
4572 addrlist->transport_return = PANIC;
4573 return FALSE; /* Only top address has status */
4576 DEBUG(D_transport) debug_printf("using the transport's hosts: %s\n",
4579 /* If the transport's host list contains no '$' characters, and we are not
4580 randomizing, it is fixed and therefore a chain of hosts can be built once
4581 and for all, and remembered for subsequent use by other calls to this
4582 transport. If, on the other hand, the host list does contain '$', or we are
4583 randomizing its order, we have to rebuild it each time. In the fixed case,
4584 as the hosts string will never be used again, it doesn't matter that we
4585 replace all the : characters with zeros. */
4589 uschar *s = ob->hosts;
4591 if (Ustrchr(s, '$') != NULL)
4593 if (!(expanded_hosts = expand_string(s)))
4595 addrlist->message = string_sprintf("failed to expand list of hosts "
4596 "\"%s\" in %s transport: %s", s, tblock->name, expand_string_message);
4597 addrlist->transport_return = f.search_find_defer ? DEFER : PANIC;
4598 return FALSE; /* Only top address has status */
4600 DEBUG(D_transport) debug_printf("expanded list of hosts \"%s\" to "
4601 "\"%s\"\n", s, expanded_hosts);
4605 if (ob->hosts_randomize) s = expanded_hosts = string_copy(s);
4609 log_write(0, LOG_MAIN|LOG_PANIC,
4610 "attempt to use tainted host list '%s' from '%s' in transport %s",
4611 s, ob->hosts, tblock->name);
4612 /* Avoid leaking info to an attacker */
4613 addrlist->message = US"internal configuration error";
4614 addrlist->transport_return = PANIC;
4618 host_build_hostlist(&hostlist, s, ob->hosts_randomize);
4620 /* Check that the expansion yielded something useful. */
4624 string_sprintf("%s transport has empty hosts setting", tblock->name);
4625 addrlist->transport_return = PANIC;
4626 return FALSE; /* Only top address has status */
4629 /* If there was no expansion of hosts, save the host list for
4632 if (!expanded_hosts) ob->hostlist = hostlist;
4635 /* This is not the first time this transport has been run in this delivery;
4636 the host list was built previously. */
4639 hostlist = ob->hostlist;
4642 /* The host list was supplied with the address. If hosts_randomize is set, we
4643 must sort it into a random order if it did not come from MX records and has not
4644 already been randomized (but don't bother if continuing down an existing
4647 else if (ob->hosts_randomize && hostlist->mx == MX_NONE && !continue_hostname)
4649 host_item *newlist = NULL;
4652 host_item *h = hostlist;
4653 hostlist = hostlist->next;
4655 h->sort_key = random_number(100);
4662 else if (h->sort_key < newlist->sort_key)
4669 host_item *hh = newlist;
4672 if (h->sort_key < hh->next->sort_key) break;
4680 hostlist = addrlist->host_list = newlist;
4683 /* Sort out the default port. */
4685 if (!smtp_get_port(ob->port, addrlist, &defport, tid)) return FALSE;
4687 /* For each host-plus-IP-address on the list:
4689 . If this is a continued delivery and the host isn't the one with the
4690 current connection, skip.
4692 . If the status is unusable (i.e. previously failed or retry checked), skip.
4694 . If no IP address set, get the address, either by turning the name into
4695 an address, calling gethostbyname if gethostbyname is on, or by calling
4696 the DNS. The DNS may yield multiple addresses, in which case insert the
4697 extra ones into the list.
4699 . Get the retry data if not previously obtained for this address and set the
4700 field which remembers the state of this address. Skip if the retry time is
4701 not reached. If not, remember whether retry data was found. The retry string
4702 contains both the name and the IP address.
4704 . Scan the list of addresses and mark those whose status is DEFER as
4705 PENDING_DEFER. These are the only ones that will be processed in this cycle
4708 . Make a delivery attempt - addresses marked PENDING_DEFER will be tried.
4709 Some addresses may be successfully delivered, others may fail, and yet
4710 others may get temporary errors and so get marked DEFER.
4712 . The return from the delivery attempt is OK if a connection was made and a
4713 valid SMTP dialogue was completed. Otherwise it is DEFER.
4715 . If OK, add a "remove" retry item for this host/IPaddress, if any.
4717 . If fail to connect, or other defer state, add a retry item.
4719 . If there are any addresses whose status is still DEFER, carry on to the
4720 next host/IPaddress, unless we have tried the number of hosts given
4721 by hosts_max_try or hosts_max_try_hardlimit; otherwise return. Note that
4722 there is some fancy logic for hosts_max_try that means its limit can be
4723 overstepped in some circumstances.
4725 If we get to the end of the list, all hosts have deferred at least one address,
4726 or not reached their retry times. If delay_after_cutoff is unset, it requests a
4727 delivery attempt to those hosts whose last try was before the arrival time of
4728 the current message. To cope with this, we have to go round the loop a second
4729 time. After that, set the status and error data for any addresses that haven't
4730 had it set already. */
4732 for (int cutoff_retry = 0;
4733 expired && cutoff_retry < (ob->delay_after_cutoff ? 1 : 2);
4736 host_item *nexthost = NULL;
4737 int unexpired_hosts_tried = 0;
4738 BOOL continue_host_tried = FALSE;
4740 retry_non_continued:
4741 for (host = hostlist;
4743 && unexpired_hosts_tried < ob->hosts_max_try
4744 && total_hosts_tried < ob->hosts_max_try_hardlimit;
4749 BOOL host_is_expired = FALSE;
4750 BOOL message_defer = FALSE;
4751 BOOL some_deferred = FALSE;
4752 address_item *first_addr = NULL;
4753 uschar *interface = NULL;
4754 uschar *retry_host_key = NULL;
4755 uschar *retry_message_key = NULL;
4756 uschar *serialize_key = NULL;
4758 /* Default next host is next host. :-) But this can vary if the
4759 hosts_max_try limit is hit (see below). It may also be reset if a host
4760 address is looked up here (in case the host was multihomed). */
4762 nexthost = host->next;
4764 /* If the address hasn't yet been obtained from the host name, look it up
4765 now, unless the host is already marked as unusable. If it is marked as
4766 unusable, it means that the router was unable to find its IP address (in
4767 the DNS or wherever) OR we are in the 2nd time round the cutoff loop, and
4768 the lookup failed last time. We don't get this far if *all* MX records
4769 point to non-existent hosts; that is treated as a hard error.
4771 We can just skip this host entirely. When the hosts came from the router,
4772 the address will timeout based on the other host(s); when the address is
4773 looked up below, there is an explicit retry record added.
4775 Note that we mustn't skip unusable hosts if the address is not unset; they
4776 may be needed as expired hosts on the 2nd time round the cutoff loop. */
4780 int new_port, flags;
4782 if (host->status >= hstatus_unusable)
4784 DEBUG(D_transport) debug_printf("%s has no address and is unusable - skipping\n",
4789 DEBUG(D_transport) debug_printf("getting address for %s\n", host->name);
4791 /* The host name is permitted to have an attached port. Find it, and
4792 strip it from the name. Just remember it for now. */
4794 new_port = host_item_get_port(host);
4796 /* Count hosts looked up */
4800 /* Find by name if so configured, or if it's an IP address. We don't
4801 just copy the IP address, because we need the test-for-local to happen. */
4803 flags = HOST_FIND_BY_A | HOST_FIND_BY_AAAA;
4804 if (ob->dns_qualify_single) flags |= HOST_FIND_QUALIFY_SINGLE;
4805 if (ob->dns_search_parents) flags |= HOST_FIND_SEARCH_PARENTS;
4807 if (ob->gethostbyname || string_is_ip_address(host->name, NULL) != 0)
4808 rc = host_find_byname(host, NULL, flags, NULL, TRUE);
4810 rc = host_find_bydns(host, NULL, flags, NULL, NULL, NULL,
4811 &ob->dnssec, /* domains for request/require */
4814 /* Update the host (and any additional blocks, resulting from
4815 multihoming) with a host-specific port, if any. */
4817 for (host_item * hh = host; hh != nexthost; hh = hh->next) hh->port = new_port;
4819 /* Failure to find the host at this time (usually DNS temporary failure)
4820 is really a kind of routing failure rather than a transport failure.
4821 Therefore we add a retry item of the routing kind, not to stop us trying
4822 to look this name up here again, but to ensure the address gets timed
4823 out if the failures go on long enough. A complete failure at this point
4824 commonly points to a configuration error, but the best action is still
4825 to carry on for the next host. */
4827 if (rc == HOST_FIND_AGAIN || rc == HOST_FIND_SECURITY || rc == HOST_FIND_FAILED)
4829 retry_add_item(addrlist, string_sprintf("R:%s", host->name), 0);
4831 if (rc == HOST_FIND_AGAIN) hosts_defer++; else hosts_fail++;
4832 DEBUG(D_transport) debug_printf("rc = %s for %s\n", (rc == HOST_FIND_AGAIN)?
4833 "HOST_FIND_AGAIN" : "HOST_FIND_FAILED", host->name);
4834 host->status = hstatus_unusable;
4836 for (address_item * addr = addrlist; addr; addr = addr->next)
4838 if (addr->transport_return != DEFER) continue;
4839 addr->basic_errno = ERRNO_UNKNOWNHOST;
4840 addr->message = string_sprintf(
4841 rc == HOST_FIND_SECURITY
4842 ? "lookup of IP address for %s was insecure"
4843 : "failed to lookup IP address for %s",
4849 /* If the host is actually the local host, we may have a problem, or
4850 there may be some cunning configuration going on. In the problem case,
4851 log things and give up. The default transport status is already DEFER. */
4853 if (rc == HOST_FOUND_LOCAL && !ob->allow_localhost)
4855 for (address_item * addr = addrlist; addr; addr = addr->next)
4857 addr->basic_errno = 0;
4858 addr->message = string_sprintf("%s transport found host %s to be "
4859 "local", tblock->name, host->name);
4863 } /* End of block for IP address lookup */
4865 /* If this is a continued delivery, we are interested only in the host
4866 which matches the name of the existing open channel. The check is put
4867 here after the local host lookup, in case the name gets expanded as a
4868 result of the lookup. Set expired FALSE, to save the outer loop executing
4871 if (continue_hostname)
4872 if ( Ustrcmp(continue_hostname, host->name) != 0
4873 || Ustrcmp(continue_host_address, host->address) != 0
4877 continue; /* With next host */
4880 continue_host_tried = TRUE;
4882 /* Reset the default next host in case a multihomed host whose addresses
4883 are not looked up till just above added to the host list. */
4885 nexthost = host->next;
4887 /* If queue_smtp is set (-odqs or the first part of a 2-stage run), or the
4888 domain is in queue_smtp_domains, we don't actually want to attempt any
4889 deliveries. When doing a queue run, queue_smtp_domains is always unset. If
4890 there is a lookup defer in queue_smtp_domains, proceed as if the domain
4891 were not in it. We don't want to hold up all SMTP deliveries! Except when
4892 doing a two-stage queue run, don't do this if forcing. */
4894 if ((!f.deliver_force || f.queue_2stage) && (f.queue_smtp ||
4895 match_isinlist(addrlist->domain,
4896 (const uschar **)&queue_smtp_domains, 0,
4897 &domainlist_anchor, NULL, MCL_DOMAIN, TRUE, NULL) == OK))
4900 for (address_item * addr = addrlist; addr; addr = addr->next)
4901 if (addr->transport_return == DEFER)
4902 addr->message = US"domain matches queue_smtp_domains, or -odqs set";
4903 continue; /* With next host */
4906 /* Count hosts being considered - purely for an intelligent comment
4907 if none are usable. */
4911 /* Set $host and $host address now in case they are needed for the
4912 interface expansion or the serialize_hosts check; they remain set if an
4913 actual delivery happens. */
4915 deliver_host = host->name;
4916 deliver_host_address = host->address;
4917 lookup_dnssec_authenticated = host->dnssec == DS_YES ? US"yes"
4918 : host->dnssec == DS_NO ? US"no"
4921 /* Set up a string for adding to the retry key if the port number is not
4922 the standard SMTP port. A host may have its own port setting that overrides
4925 pistring = string_sprintf(":%d", host->port == PORT_NONE
4926 ? defport : host->port);
4927 if (Ustrcmp(pistring, ":25") == 0) pistring = US"";
4929 /* Select IPv4 or IPv6, and choose an outgoing interface. If the interface
4930 string is set, even if constant (as different transports can have different
4931 constant settings), we must add it to the key that is used for retries,
4932 because connections to the same host from a different interface should be
4933 treated separately. */
4935 host_af = Ustrchr(host->address, ':') == NULL ? AF_INET : AF_INET6;
4937 uschar * s = ob->interface;
4940 if (!smtp_get_interface(s, host_af, addrlist, &interface, tid))
4942 pistring = string_sprintf("%s/%s", pistring, interface);
4946 /* The first time round the outer loop, check the status of the host by
4947 inspecting the retry data. The second time round, we are interested only
4948 in expired hosts that haven't been tried since this message arrived. */
4950 if (cutoff_retry == 0)
4953 /* Ensure the status of the address is set by checking retry data if
4954 necessary. There may be host-specific retry data (applicable to all
4955 messages) and also data for retries of a specific message at this host.
4956 If either of these retry records are actually read, the keys used are
4957 returned to save recomputing them later. */
4959 if (exp_bool(addrlist, US"transport", tblock->name, D_transport,
4960 US"retry_include_ip_address", ob->retry_include_ip_address,
4961 ob->expand_retry_include_ip_address, &incl_ip) != OK)
4962 continue; /* with next host */
4964 host_is_expired = retry_check_address(addrlist->domain, host, pistring,
4965 incl_ip, &retry_host_key, &retry_message_key);
4967 DEBUG(D_transport) debug_printf("%s [%s]%s retry-status = %s\n", host->name,
4968 host->address ? host->address : US"", pistring,
4969 host->status == hstatus_usable ? "usable"
4970 : host->status == hstatus_unusable ? "unusable"
4971 : host->status == hstatus_unusable_expired ? "unusable (expired)" : "?");
4973 /* Skip this address if not usable at this time, noting if it wasn't
4974 actually expired, both locally and in the address. */
4976 switch (host->status)
4978 case hstatus_unusable:
4980 setflag(addrlist, af_retry_skipped);
4983 case hstatus_unusable_expired:
4986 case hwhy_retry: hosts_retry++; break;
4987 case hwhy_failed: hosts_fail++; break;
4989 case hwhy_deferred: hosts_defer++; break;
4992 /* If there was a retry message key, implying that previously there
4993 was a message-specific defer, we don't want to update the list of
4994 messages waiting for these hosts. */
4996 if (retry_message_key) update_waiting = FALSE;
4997 continue; /* With the next host or IP address */
5001 /* Second time round the loop: if the address is set but expired, and
5002 the message is newer than the last try, let it through. */
5007 || host->status != hstatus_unusable_expired
5008 || host->last_try > received_time.tv_sec)
5010 DEBUG(D_transport) debug_printf("trying expired host %s [%s]%s\n",
5011 host->name, host->address, pistring);
5012 host_is_expired = TRUE;
5015 /* Setting "expired=FALSE" doesn't actually mean not all hosts are expired;
5016 it remains TRUE only if all hosts are expired and none are actually tried.
5021 /* If this host is listed as one to which access must be serialized,
5022 see if another Exim process has a connection to it, and if so, skip
5023 this host. If not, update the database to record our connection to it
5024 and remember this for later deletion. Do not do any of this if we are
5025 sending the message down a pre-existing connection. */
5027 if ( !continue_hostname
5028 && verify_check_given_host(CUSS &ob->serialize_hosts, host) == OK)
5030 serialize_key = string_sprintf("host-serialize-%s", host->name);
5031 if (!enq_start(serialize_key, 1))
5034 debug_printf("skipping host %s because another Exim process "
5035 "is connected to it\n", host->name);
5041 /* OK, we have an IP address that is not waiting for its retry time to
5042 arrive (it might be expired) OR (second time round the loop) we have an
5043 expired host that hasn't been tried since the message arrived. Have a go
5044 at delivering the message to it. First prepare the addresses by flushing
5045 out the result of previous attempts, and finding the first address that
5046 is still to be delivered. */
5048 first_addr = prepare_addresses(addrlist, host);
5050 DEBUG(D_transport) debug_printf("delivering %s to %s [%s] (%s%s)\n",
5051 message_id, host->name, host->address, addrlist->address,
5052 addrlist->next ? ", ..." : "");
5054 set_process_info("delivering %s to %s [%s]%s (%s%s)",
5055 message_id, host->name, host->address, pistring, addrlist->address,
5056 addrlist->next ? ", ..." : "");
5058 /* This is not for real; don't do the delivery. If there are
5059 any remaining hosts, list them. */
5063 set_errno_nohost(addrlist, 0, NULL, OK, FALSE);
5064 for (address_item * addr = addrlist; addr; addr = addr->next)
5066 addr->host_used = host;
5067 addr->special_action = '*';
5068 addr->message = US"delivery bypassed by -N option";
5072 debug_printf("*** delivery by %s transport bypassed by -N option\n"
5073 "*** host and remaining hosts:\n", tblock->name);
5074 for (host_item * host2 = host; host2; host2 = host2->next)
5075 debug_printf(" %s [%s]\n", host2->name,
5076 host2->address ? host2->address : US"unset");
5081 /* This is for real. If the host is expired, we don't count it for
5082 hosts_max_retry. This ensures that all hosts must expire before an address
5083 is timed out, unless hosts_max_try_hardlimit (which protects against
5084 lunatic DNS configurations) is reached.
5086 If the host is not expired and we are about to hit the hosts_max_retry
5087 limit, check to see if there is a subsequent hosts with a different MX
5088 value. If so, make that the next host, and don't count this one. This is a
5089 heuristic to make sure that different MXs do get tried. With a normal kind
5090 of retry rule, they would get tried anyway when the earlier hosts were
5091 delayed, but if the domain has a "retry every time" type of rule - as is
5092 often used for the the very large ISPs, that won't happen. */
5097 /* Make a copy of the host if it is local to this invocation
5098 of the transport. */
5102 thost = store_get(sizeof(host_item), FALSE);
5104 thost->name = string_copy(host->name);
5105 thost->address = string_copy(host->address);
5110 if (!host_is_expired && ++unexpired_hosts_tried >= ob->hosts_max_try)
5113 debug_printf("hosts_max_try limit reached with this host\n");
5114 for (host_item * h = host; h; h = h->next) if (h->mx != host->mx)
5117 unexpired_hosts_tried--;
5118 DEBUG(D_transport) debug_printf("however, a higher MX host exists "
5119 "and will be tried\n");
5124 /* Attempt the delivery. */
5126 total_hosts_tried++;
5127 rc = smtp_deliver(addrlist, thost, host_af, defport, interface, tblock,
5128 &message_defer, FALSE);
5131 OK => connection made, each address contains its result;
5132 message_defer is set for message-specific defers (when all
5133 recipients are marked defer)
5134 DEFER => there was a non-message-specific delivery problem;
5135 ERROR => there was a problem setting up the arguments for a filter,
5136 or there was a problem with expanding added headers
5139 /* If the result is not OK, there was a non-message-specific problem.
5140 If the result is DEFER, we need to write to the logs saying what happened
5141 for this particular host, except in the case of authentication and TLS
5142 failures, where the log has already been written. If all hosts defer a
5143 general message is written at the end. */
5145 if (rc == DEFER && first_addr->basic_errno != ERRNO_AUTHFAIL
5146 && first_addr->basic_errno != ERRNO_TLSFAILURE)
5147 write_logs(host, first_addr->message, first_addr->basic_errno);
5149 #ifndef DISABLE_EVENT
5151 deferred_event_raise(first_addr, host);
5154 /* If STARTTLS was accepted, but there was a failure in setting up the
5155 TLS session (usually a certificate screwup), and the host is not in
5156 hosts_require_tls, and tls_tempfail_tryclear is true, try again, with
5157 TLS forcibly turned off. We have to start from scratch with a new SMTP
5158 connection. That's why the retry is done from here, not from within
5159 smtp_deliver(). [Rejections of STARTTLS itself don't screw up the
5160 session, so the in-clear transmission after those errors, if permitted,
5161 happens inside smtp_deliver().] */
5165 && first_addr->basic_errno == ERRNO_TLSFAILURE
5166 && ob->tls_tempfail_tryclear
5167 && verify_check_given_host(CUSS &ob->hosts_require_tls, host) != OK
5170 log_write(0, LOG_MAIN,
5171 "%s: delivering unencrypted to H=%s [%s] (not in hosts_require_tls)",
5172 first_addr->message, host->name, host->address);
5173 first_addr = prepare_addresses(addrlist, host);
5174 rc = smtp_deliver(addrlist, thost, host_af, defport, interface, tblock,
5175 &message_defer, TRUE);
5176 if (rc == DEFER && first_addr->basic_errno != ERRNO_AUTHFAIL)
5177 write_logs(host, first_addr->message, first_addr->basic_errno);
5178 # ifndef DISABLE_EVENT
5180 deferred_event_raise(first_addr, host);
5183 #endif /*DISABLE_TLS*/
5186 /* Delivery attempt finished */
5188 set_process_info("delivering %s: just tried %s [%s]%s for %s%s: result %s",
5189 message_id, host->name, host->address, pistring, addrlist->address,
5190 addrlist->next ? " (& others)" : "", rc_to_string(rc));
5192 /* Release serialization if set up */
5194 if (serialize_key) enq_end(serialize_key);
5196 /* If the result is DEFER, or if a host retry record is known to exist, we
5197 need to add an item to the retry chain for updating the retry database
5198 at the end of delivery. We only need to add the item to the top address,
5199 of course. Also, if DEFER, we mark the IP address unusable so as to skip it
5200 for any other delivery attempts using the same address. (It is copied into
5201 the unusable tree at the outer level, so even if different address blocks
5202 contain the same address, it still won't get tried again.) */
5204 if (rc == DEFER || retry_host_key)
5206 int delete_flag = rc != DEFER ? rf_delete : 0;
5207 if (!retry_host_key)
5210 if (exp_bool(addrlist, US"transport", tblock->name, D_transport,
5211 US"retry_include_ip_address", ob->retry_include_ip_address,
5212 ob->expand_retry_include_ip_address, &incl_ip) != OK)
5213 incl_ip = TRUE; /* error; use most-specific retry record */
5215 retry_host_key = incl_ip
5216 ? string_sprintf("T:%S:%s%s", host->name, host->address, pistring)
5217 : string_sprintf("T:%S%s", host->name, pistring);
5220 /* If a delivery of another message over an existing SMTP connection
5221 yields DEFER, we do NOT set up retry data for the host. This covers the
5222 case when there are delays in routing the addresses in the second message
5223 that are so long that the server times out. This is alleviated by not
5224 routing addresses that previously had routing defers when handling an
5225 existing connection, but even so, this case may occur (e.g. if a
5226 previously happily routed address starts giving routing defers). If the
5227 host is genuinely down, another non-continued message delivery will
5228 notice it soon enough. */
5230 if (delete_flag != 0 || !continue_hostname)
5231 retry_add_item(first_addr, retry_host_key, rf_host | delete_flag);
5233 /* We may have tried an expired host, if its retry time has come; ensure
5234 the status reflects the expiry for the benefit of any other addresses. */
5238 host->status = host_is_expired
5239 ? hstatus_unusable_expired : hstatus_unusable;
5240 host->why = hwhy_deferred;
5244 /* If message_defer is set (host was OK, but every recipient got deferred
5245 because of some message-specific problem), or if that had happened
5246 previously so that a message retry key exists, add an appropriate item
5247 to the retry chain. Note that if there was a message defer but now there is
5248 a host defer, the message defer record gets deleted. That seems perfectly
5249 reasonable. Also, stop the message from being remembered as waiting
5250 for specific hosts. */
5252 if (message_defer || retry_message_key)
5254 int delete_flag = message_defer ? 0 : rf_delete;
5255 if (!retry_message_key)
5258 if (exp_bool(addrlist, US"transport", tblock->name, D_transport,
5259 US"retry_include_ip_address", ob->retry_include_ip_address,
5260 ob->expand_retry_include_ip_address, &incl_ip) != OK)
5261 incl_ip = TRUE; /* error; use most-specific retry record */
5263 retry_message_key = incl_ip
5264 ? string_sprintf("T:%S:%s%s:%s", host->name, host->address, pistring,
5266 : string_sprintf("T:%S%s:%s", host->name, pistring, message_id);
5268 retry_add_item(addrlist, retry_message_key,
5269 rf_message | rf_host | delete_flag);
5270 update_waiting = FALSE;
5273 /* Any return other than DEFER (that is, OK or ERROR) means that the
5274 addresses have got their final statuses filled in for this host. In the OK
5275 case, see if any of them are deferred. */
5278 for (address_item * addr = addrlist; addr; addr = addr->next)
5279 if (addr->transport_return == DEFER)
5281 some_deferred = TRUE;
5285 /* If no addresses deferred or the result was ERROR, return. We do this for
5286 ERROR because a failing filter set-up or add_headers expansion is likely to
5287 fail for any host we try. */
5289 if (rc == ERROR || (rc == OK && !some_deferred))
5291 DEBUG(D_transport) debug_printf("Leaving %s transport\n", tblock->name);
5292 return TRUE; /* Each address has its status */
5295 /* If the result was DEFER or some individual addresses deferred, let
5296 the loop run to try other hosts with the deferred addresses, except for the
5297 case when we were trying to deliver down an existing channel and failed.
5298 Don't try any other hosts in this case. */
5300 if (continue_hostname) break;
5302 /* If the whole delivery, or some individual addresses, were deferred and
5303 there are more hosts that could be tried, do not count this host towards
5304 the hosts_max_try limit if the age of the message is greater than the
5305 maximum retry time for this host. This means we may try try all hosts,
5306 ignoring the limit, when messages have been around for some time. This is
5307 important because if we don't try all hosts, the address will never time
5308 out. NOTE: this does not apply to hosts_max_try_hardlimit. */
5310 if ((rc == DEFER || some_deferred) && nexthost)
5313 retry_config *retry = retry_find_config(host->name, NULL, 0, 0);
5315 if (retry && retry->rules)
5317 retry_rule *last_rule;
5318 for (last_rule = retry->rules;
5320 last_rule = last_rule->next);
5321 timedout = time(NULL) - received_time.tv_sec > last_rule->timeout;
5323 else timedout = TRUE; /* No rule => timed out */
5327 unexpired_hosts_tried--;
5328 DEBUG(D_transport) debug_printf("temporary delivery error(s) override "
5329 "hosts_max_try (message older than host's retry time)\n");
5335 if (unexpired_hosts_tried >= ob->hosts_max_try)
5336 debug_printf("reached transport hosts_max_try limit %d\n",
5338 if (total_hosts_tried >= ob->hosts_max_try_hardlimit)
5339 debug_printf("reached transport hosts_max_try_hardlimit limit %d\n",
5340 ob->hosts_max_try_hardlimit);
5343 if (f.running_in_test_harness) millisleep(500); /* let server debug out */
5344 } /* End of loop for trying multiple hosts. */
5346 /* If we failed to find a matching host in the list, for an already-open
5347 connection, just close it and start over with the list. This can happen
5348 for routing that changes from run to run, or big multi-IP sites with
5351 if (continue_hostname && !continue_host_tried)
5353 int fd = cutthrough.cctx.sock >= 0 ? cutthrough.cctx.sock : 0;
5355 DEBUG(D_transport) debug_printf("no hosts match already-open connection\n");
5357 /* A TLS conn could be open for a cutthrough, but not for a plain continued-
5359 /*XXX doublecheck that! */
5361 if (cutthrough.cctx.sock >= 0 && cutthrough.is_tls)
5363 (void) tls_write(cutthrough.cctx.tls_ctx, US"QUIT\r\n", 6, FALSE);
5364 tls_close(cutthrough.cctx.tls_ctx, TLS_SHUTDOWN_NOWAIT);
5365 cutthrough.cctx.tls_ctx = NULL;
5366 cutthrough.is_tls = FALSE;
5370 (void) write(fd, US"QUIT\r\n", 6);
5373 cutthrough.cctx.sock = -1;
5374 continue_hostname = NULL;
5375 goto retry_non_continued;
5378 /* This is the end of the loop that repeats iff expired is TRUE and
5379 ob->delay_after_cutoff is FALSE. The second time round we will
5380 try those hosts that haven't been tried since the message arrived. */
5384 debug_printf("all IP addresses skipped or deferred at least one address\n");
5385 if (expired && !ob->delay_after_cutoff && cutoff_retry == 0)
5386 debug_printf("retrying IP addresses not tried since message arrived\n");
5391 /* Get here if all IP addresses are skipped or defer at least one address. In
5392 MUA wrapper mode, this will happen only for connection or other non-message-
5393 specific failures. Force the delivery status for all addresses to FAIL. */
5397 for (address_item * addr = addrlist; addr; addr = addr->next)
5398 addr->transport_return = FAIL;
5402 /* In the normal, non-wrapper case, add a standard message to each deferred
5403 address if there hasn't been an error, that is, if it hasn't actually been
5404 tried this time. The variable "expired" will be FALSE if any deliveries were
5405 actually tried, or if there was at least one host that was not expired. That
5406 is, it is TRUE only if no deliveries were tried and all hosts were expired. If
5407 a delivery has been tried, an error code will be set, and the failing of the
5408 message is handled by the retry code later.
5410 If queue_smtp is set, or this transport was called to send a subsequent message
5411 down an existing TCP/IP connection, and something caused the host not to be
5412 found, we end up here, but can detect these cases and handle them specially. */
5414 for (address_item * addr = addrlist; addr; addr = addr->next)
5416 /* If host is not NULL, it means that we stopped processing the host list
5417 because of hosts_max_try or hosts_max_try_hardlimit. In the former case, this
5418 means we need to behave as if some hosts were skipped because their retry
5419 time had not come. Specifically, this prevents the address from timing out.
5420 However, if we have hit hosts_max_try_hardlimit, we want to behave as if all
5421 hosts were tried. */
5424 if (total_hosts_tried >= ob->hosts_max_try_hardlimit)
5427 debug_printf("hosts_max_try_hardlimit reached: behave as if all "
5428 "hosts were tried\n");
5433 debug_printf("hosts_max_try limit caused some hosts to be skipped\n");
5434 setflag(addr, af_retry_skipped);
5437 if (f.queue_smtp) /* no deliveries attempted */
5439 addr->transport_return = DEFER;
5440 addr->basic_errno = 0;
5441 addr->message = US"SMTP delivery explicitly queued";
5444 else if ( addr->transport_return == DEFER
5445 && (addr->basic_errno == ERRNO_UNKNOWNERROR || addr->basic_errno == 0)
5449 addr->basic_errno = ERRNO_HRETRY;
5450 if (continue_hostname)
5451 addr->message = US"no host found for existing SMTP connection";
5454 setflag(addr, af_pass_message); /* This is not a security risk */
5455 addr->message = string_sprintf(
5456 "all hosts%s have been failing for a long time %s",
5457 addr->domain ? string_sprintf(" for '%s'", addr->domain) : US"",
5458 ob->delay_after_cutoff
5459 ? US"(and retry time not reached)"
5460 : US"and were last tried after this message arrived");
5462 /* If we are already using fallback hosts, or there are no fallback hosts
5463 defined, convert the result to FAIL to cause a bounce. */
5465 if (addr->host_list == addr->fallback_hosts || !addr->fallback_hosts)
5466 addr->transport_return = FAIL;
5471 if (hosts_retry == hosts_total)
5472 s = "retry time not reached for any host%s";
5473 else if (hosts_fail == hosts_total)
5474 s = "all host address lookups%s failed permanently";
5475 else if (hosts_defer == hosts_total)
5476 s = "all host address lookups%s failed temporarily";
5477 else if (hosts_serial == hosts_total)
5478 s = "connection limit reached for all hosts%s";
5479 else if (hosts_fail+hosts_defer == hosts_total)
5480 s = "all host address lookups%s failed";
5482 s = "some host address lookups failed and retry time "
5483 "not reached for other hosts or connection limit reached%s";
5485 addr->message = string_sprintf(s,
5486 addr->domain ? string_sprintf(" for '%s'", addr->domain) : US"");
5491 /* Update the database which keeps information about which messages are waiting
5492 for which hosts to become available. For some message-specific errors, the
5493 update_waiting flag is turned off because we don't want follow-on deliveries in
5494 those cases. If this transport instance is explicitly limited to one message
5495 per connection then follow-on deliveries are not possible and there's no need
5496 to create/update the per-transport wait-<transport_name> database. */
5498 if (update_waiting && tblock->connection_max_messages != 1)
5499 transport_update_waiting(hostlist, tblock->name);
5503 DEBUG(D_transport) debug_printf("Leaving %s transport\n", tblock->name);
5505 return TRUE; /* Each address has its status */
5508 #endif /*!MACRO_PREDEF*/
5511 /* End of transport/smtp.c */