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 EXPERIMENTAL_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 = NULL,
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 EXPERIMENTAL_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 = string_sprintf("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 EXPERIMENTAL_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 EXPERIMENTAL_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 string_format(big_buffer, big_buffer_size, "RCPT TO:<%s>",
1188 transport_rcpt_address(addr, sx->conn_args.tblock->rcpt_include_affixes));
1192 /* Handle SMTP permanent and temporary response codes. */
1197 string_sprintf("SMTP error from remote mail server after RCPT TO:<%s>: "
1198 "%s", transport_rcpt_address(addr, sx->conn_args.tblock->rcpt_include_affixes),
1199 string_printing(sx->buffer));
1200 setflag(addr, af_pass_message);
1202 msglog_line(sx->conn_args.host, addr->message);
1204 /* The response was 5xx */
1206 if (sx->buffer[0] == '5')
1208 addr->transport_return = FAIL;
1212 /* The response was 4xx */
1216 addr->transport_return = DEFER;
1217 addr->basic_errno = ERRNO_RCPT4XX;
1218 addr->more_errno |= ((sx->buffer[1] - '0')*10 + sx->buffer[2] - '0') << 8;
1222 #ifndef DISABLE_EVENT
1223 event_defer_errno = addr->more_errno;
1224 msg_event_raise(US"msg:rcpt:host:defer", addr);
1227 /* Log temporary errors if there are more hosts to be tried.
1228 If not, log this last one in the == line. */
1230 if (sx->conn_args.host->next)
1231 if (LOGGING(outgoing_port))
1232 log_write(0, LOG_MAIN, "H=%s [%s]:%d %s", sx->conn_args.host->name,
1233 sx->conn_args.host->address,
1234 sx->port == PORT_NONE ? 25 : sx->port, addr->message);
1236 log_write(0, LOG_MAIN, "H=%s [%s]: %s", sx->conn_args.host->name,
1237 sx->conn_args.host->address, addr->message);
1239 #ifndef DISABLE_EVENT
1241 msg_event_raise(US"msg:rcpt:defer", addr);
1244 /* Do not put this message on the list of those waiting for specific
1245 hosts, as otherwise it is likely to be tried too often. */
1247 update_waiting = FALSE;
1249 /* Add a retry item for the address so that it doesn't get tried again
1250 too soon. If address_retry_include_sender is true, add the sender address
1251 to the retry key. */
1253 retry_add_item(addr,
1254 ob->address_retry_include_sender
1255 ? string_sprintf("%s:<%s>", addr->address_retry_key, sender_address)
1256 : addr->address_retry_key,
1261 } /* Loop for next RCPT response */
1263 /* Update where to start at for the next block of responses, unless we
1264 have already handled all the addresses. */
1266 if (addr) sx->sync_addr = addr->next;
1268 /* Handle a response to DATA. If we have not had any good recipients, either
1269 previously or in this block, the response is ignored. */
1271 if (pending_DATA != 0)
1273 DEBUG(D_transport) debug_printf("%s expect data\n", __FUNCTION__);
1274 if (!smtp_read_response(sx, sx->buffer, sizeof(sx->buffer),
1275 '3', ob->command_timeout))
1281 if (errno == ERRNO_TLSFAILURE) /* Error on first TLS read */
1284 if (pending_DATA > 0 || (yield & 1) != 0)
1286 if (errno == 0 && sx->buffer[0] == '4')
1288 errno = ERRNO_DATA4XX;
1289 sx->first_addr->more_errno |= ((sx->buffer[1] - '0')*10 + sx->buffer[2] - '0') << 8;
1293 (void)check_response(sx->conn_args.host, &errno, 0, sx->buffer, &code, &msg, &pass_message);
1294 DEBUG(D_transport) debug_printf("%s\nerror for DATA ignored: pipelining "
1295 "is in use and there were no good recipients\n", msg);
1299 /* All responses read and handled; MAIL (if present) received 2xx and DATA (if
1300 present) received 3xx. If any RCPTs were handled and yielded anything other
1301 than 4xx, yield will be set non-zero. */
1310 /* Try an authenticator's client entry */
1313 try_authenticator(smtp_context * sx, auth_instance * au)
1315 smtp_transport_options_block * ob = sx->conn_args.ob; /* transport options */
1316 host_item * host = sx->conn_args.host; /* host to deliver to */
1319 sx->outblock.authenticating = TRUE;
1320 rc = (au->info->clientcode)(au, sx, ob->command_timeout,
1321 sx->buffer, sizeof(sx->buffer));
1322 sx->outblock.authenticating = FALSE;
1323 DEBUG(D_transport) debug_printf("%s authenticator yielded %d\n", au->name, rc);
1325 /* A temporary authentication failure must hold up delivery to
1326 this host. After a permanent authentication failure, we carry on
1327 to try other authentication methods. If all fail hard, try to
1328 deliver the message unauthenticated unless require_auth was set. */
1333 f.smtp_authenticated = TRUE; /* stops the outer loop */
1334 client_authenticator = au->name;
1335 if (au->set_client_id)
1336 client_authenticated_id = expand_string(au->set_client_id);
1339 /* Failure after writing a command */
1344 /* Failure after reading a response */
1347 if (errno != 0 || sx->buffer[0] != '5') return FAIL;
1348 log_write(0, LOG_MAIN, "%s authenticator failed H=%s [%s] %s",
1349 au->name, host->name, host->address, sx->buffer);
1352 /* Failure by some other means. In effect, the authenticator
1353 decided it wasn't prepared to handle this case. Typically this
1354 is the result of "fail" in an expansion string. Do we need to
1355 log anything here? Feb 2006: a message is now put in the buffer
1356 if logging is required. */
1359 if (*sx->buffer != 0)
1360 log_write(0, LOG_MAIN, "%s authenticator cancelled "
1361 "authentication H=%s [%s] %s", au->name, host->name,
1362 host->address, sx->buffer);
1365 /* Internal problem, message in buffer. */
1368 set_errno_nohost(sx->addrlist, ERRNO_AUTHPROB, string_copy(sx->buffer),
1378 /* Do the client side of smtp-level authentication.
1381 sx smtp connection context
1383 sx->buffer should have the EHLO response from server (gets overwritten)
1386 OK Success, or failed (but not required): global "smtp_authenticated" set
1387 DEFER Failed authentication (and was required)
1388 ERROR Internal problem
1390 FAIL_SEND Failed communications - transmit
1395 smtp_auth(smtp_context * sx)
1397 host_item * host = sx->conn_args.host; /* host to deliver to */
1398 smtp_transport_options_block * ob = sx->conn_args.ob; /* transport options */
1399 int require_auth = verify_check_given_host(CUSS &ob->hosts_require_auth, host);
1400 #ifdef EXPERIMENTAL_PIPE_CONNECT
1401 unsigned short authbits = tls_out.active.sock >= 0
1402 ? sx->ehlo_resp.crypted_auths : sx->ehlo_resp.cleartext_auths;
1404 uschar * fail_reason = US"server did not advertise AUTH support";
1406 f.smtp_authenticated = FALSE;
1407 client_authenticator = client_authenticated_id = client_authenticated_sender = NULL;
1410 regex_AUTH = regex_must_compile(AUTHS_REGEX, FALSE, TRUE);
1412 /* Is the server offering AUTH? */
1416 #ifdef EXPERIMENTAL_PIPE_CONNECT
1417 sx->early_pipe_active ? authbits
1420 regex_match_and_setup(regex_AUTH, sx->buffer, 0, -1)
1423 uschar * names = NULL;
1424 expand_nmax = -1; /* reset */
1426 #ifdef EXPERIMENTAL_PIPE_CONNECT
1427 if (!sx->early_pipe_active)
1429 names = string_copyn(expand_nstring[1], expand_nlength[1]);
1431 /* Must not do this check until after we have saved the result of the
1432 regex match above as the check could be another RE. */
1434 if ( require_auth == OK
1435 || verify_check_given_host(CUSS &ob->hosts_try_auth, host) == OK)
1437 DEBUG(D_transport) debug_printf("scanning authentication mechanisms\n");
1438 fail_reason = US"no common mechanisms were found";
1440 #ifdef EXPERIMENTAL_PIPE_CONNECT
1441 if (sx->early_pipe_active)
1443 /* Scan our authenticators (which support use by a client and were offered
1444 by the server (checked at cache-write time)), not suppressed by
1445 client_condition. If one is found, attempt to authenticate by calling its
1446 client function. We are limited to supporting up to 16 authenticator
1447 public-names by the number of bits in a short. */
1453 for (bitnum = 0, au = auths;
1454 !f.smtp_authenticated && au && bitnum < 16;
1455 bitnum++, au = au->next) if (authbits & BIT(bitnum))
1457 if ( au->client_condition
1458 && !expand_check_condition(au->client_condition, au->name,
1459 US"client authenticator"))
1461 DEBUG(D_transport) debug_printf("skipping %s authenticator: %s\n",
1462 au->name, "client_condition is false");
1466 /* Found data for a listed mechanism. Call its client entry. Set
1467 a flag in the outblock so that data is overwritten after sending so
1468 that reflections don't show it. */
1470 fail_reason = US"authentication attempt(s) failed";
1472 if ((rc = try_authenticator(sx, au)) != OK)
1479 /* Scan the configured authenticators looking for one which is configured
1480 for use as a client, which is not suppressed by client_condition, and
1481 whose name matches an authentication mechanism supported by the server.
1482 If one is found, attempt to authenticate by calling its client function.
1485 for (auth_instance * au = auths; !f.smtp_authenticated && au; au = au->next)
1490 || ( au->client_condition
1491 && !expand_check_condition(au->client_condition, au->name,
1492 US"client authenticator")))
1494 DEBUG(D_transport) debug_printf("skipping %s authenticator: %s\n",
1496 (au->client)? "client_condition is false" :
1497 "not configured as a client");
1501 /* Loop to scan supported server mechanisms */
1505 int len = Ustrlen(au->public_name);
1508 while (isspace(*p)) p++;
1510 if (strncmpic(au->public_name, p, len) != 0 ||
1511 (p[len] != 0 && !isspace(p[len])))
1513 while (*p != 0 && !isspace(*p)) p++;
1517 /* Found data for a listed mechanism. Call its client entry. Set
1518 a flag in the outblock so that data is overwritten after sending so
1519 that reflections don't show it. */
1521 fail_reason = US"authentication attempt(s) failed";
1523 if ((rc = try_authenticator(sx, au)) != OK)
1526 break; /* If not authenticated, try next authenticator */
1527 } /* Loop for scanning supported server mechanisms */
1528 } /* Loop for further authenticators */
1532 /* If we haven't authenticated, but are required to, give up. */
1534 if (require_auth == OK && !f.smtp_authenticated)
1536 set_errno_nohost(sx->addrlist, ERRNO_AUTHFAIL,
1537 string_sprintf("authentication required but %s", fail_reason), DEFER,
1546 /* Construct AUTH appendix string for MAIL TO */
1549 buffer to build string
1550 addrlist chain of potential addresses to deliver
1551 ob transport options
1553 Globals f.smtp_authenticated
1554 client_authenticated_sender
1555 Return True on error, otherwise buffer has (possibly empty) terminated string
1559 smtp_mail_auth_str(uschar *buffer, unsigned bufsize, address_item *addrlist,
1560 smtp_transport_options_block *ob)
1562 uschar *local_authenticated_sender = authenticated_sender;
1565 debug_printf("smtp_mail_auth_str: as<%s> os<%s> SA<%s>\n", authenticated_sender, ob->authenticated_sender, f.smtp_authenticated?"Y":"N");
1568 if (ob->authenticated_sender != NULL)
1570 uschar *new = expand_string(ob->authenticated_sender);
1573 if (!f.expand_string_forcedfail)
1575 uschar *message = string_sprintf("failed to expand "
1576 "authenticated_sender: %s", expand_string_message);
1577 set_errno_nohost(addrlist, ERRNO_EXPANDFAIL, message, DEFER, FALSE);
1581 else if (new[0] != 0) local_authenticated_sender = new;
1584 /* Add the authenticated sender address if present */
1586 if ((f.smtp_authenticated || ob->authenticated_sender_force) &&
1587 local_authenticated_sender != NULL)
1589 string_format(buffer, bufsize, " AUTH=%s",
1590 auth_xtextencode(local_authenticated_sender,
1591 Ustrlen(local_authenticated_sender)));
1592 client_authenticated_sender = string_copy(local_authenticated_sender);
1603 /* Lookup TLSA record for host/port.
1604 Return: OK success with dnssec; DANE mode
1605 DEFER Do not use this host now, may retry later
1606 FAIL_FORCED No TLSA record; DANE not usable
1607 FAIL Do not use this connection
1611 tlsa_lookup(const host_item * host, dns_answer * dnsa, BOOL dane_required)
1613 /* move this out to host.c given the similarity to dns_lookup() ? */
1615 const uschar * fullname = buffer;
1619 /* TLSA lookup string */
1620 (void)sprintf(CS buffer, "_%d._tcp.%.256s", host->port, host->name);
1622 rc = dns_lookup(dnsa, buffer, T_TLSA, &fullname);
1623 sec = dns_is_secure(dnsa);
1625 debug_printf("TLSA lookup ret %d %sDNSSEC\n", rc, sec ? "" : "not ");
1630 return DEFER; /* just defer this TLS'd conn */
1638 for (dns_record * rr = dns_next_rr(dnsa, &dnss, RESET_ANSWERS); rr;
1639 rr = dns_next_rr(dnsa, &dnss, RESET_NEXT))
1640 if (rr->type == T_TLSA && rr->size > 3)
1642 uint16_t payload_length = rr->size - 3;
1643 uschar s[MAX_TLSA_EXPANDED_SIZE], * sp = s, * p = US rr->data;
1645 sp += sprintf(CS sp, "%d ", *p++); /* usage */
1646 sp += sprintf(CS sp, "%d ", *p++); /* selector */
1647 sp += sprintf(CS sp, "%d ", *p++); /* matchtype */
1648 while (payload_length-- > 0 && sp-s < (MAX_TLSA_EXPANDED_SIZE - 4))
1649 sp += sprintf(CS sp, "%02x", *p++);
1651 debug_printf(" %s\n", s);
1656 log_write(0, LOG_MAIN,
1657 "DANE error: TLSA lookup for %s not DNSSEC", host->name);
1660 case DNS_NODATA: /* no TLSA RR for this lookup */
1661 case DNS_NOMATCH: /* no records at all for this lookup */
1662 return dane_required ? FAIL : FAIL_FORCED;
1666 return dane_required ? FAIL : DEFER;
1673 typedef struct smtp_compare_s
1675 uschar *current_sender_address;
1676 struct transport_instance *tblock;
1680 /* Create a unique string that identifies this message, it is based on
1681 sender_address, helo_data and tls_certificate if enabled.
1685 smtp_local_identity(uschar * sender, struct transport_instance * tblock)
1687 address_item * addr1;
1688 uschar * if1 = US"";
1689 uschar * helo1 = US"";
1691 uschar * tlsc1 = US"";
1693 uschar * save_sender_address = sender_address;
1694 uschar * local_identity = NULL;
1695 smtp_transport_options_block * ob = SOB tblock->options_block;
1697 sender_address = sender;
1699 addr1 = deliver_make_addr (sender, TRUE);
1700 deliver_set_expansions(addr1);
1703 if1 = expand_string(ob->interface);
1706 helo1 = expand_string(ob->helo_data);
1709 if (ob->tls_certificate)
1710 tlsc1 = expand_string(ob->tls_certificate);
1711 local_identity = string_sprintf ("%s^%s^%s", if1, helo1, tlsc1);
1713 local_identity = string_sprintf ("%s^%s", if1, helo1);
1716 deliver_set_expansions(NULL);
1717 sender_address = save_sender_address;
1719 return local_identity;
1724 /* This routine is a callback that is called from transport_check_waiting.
1725 This function will evaluate the incoming message versus the previous
1726 message. If the incoming message is using a different local identity then
1727 we will veto this new message. */
1730 smtp_are_same_identities(uschar * message_id, smtp_compare_t * s_compare)
1732 uschar * message_local_identity,
1733 * current_local_identity,
1734 * new_sender_address;
1736 current_local_identity =
1737 smtp_local_identity(s_compare->current_sender_address, s_compare->tblock);
1739 if (!(new_sender_address = deliver_get_sender_address(message_id)))
1742 message_local_identity =
1743 smtp_local_identity(new_sender_address, s_compare->tblock);
1745 return Ustrcmp(current_local_identity, message_local_identity) == 0;
1751 ehlo_response(uschar * buf, unsigned checks)
1753 size_t bsize = Ustrlen(buf);
1755 /* debug_printf("%s: check for 0x%04x\n", __FUNCTION__, checks); */
1758 if ( checks & OPTION_TLS
1759 && pcre_exec(regex_STARTTLS, NULL, CS buf, bsize, 0, PCRE_EOPT, NULL, 0) < 0)
1761 checks &= ~OPTION_TLS;
1763 if ( checks & OPTION_IGNQ
1764 && pcre_exec(regex_IGNOREQUOTA, NULL, CS buf, bsize, 0,
1765 PCRE_EOPT, NULL, 0) < 0)
1766 checks &= ~OPTION_IGNQ;
1768 if ( checks & OPTION_CHUNKING
1769 && pcre_exec(regex_CHUNKING, NULL, CS buf, bsize, 0, PCRE_EOPT, NULL, 0) < 0)
1770 checks &= ~OPTION_CHUNKING;
1772 #ifndef DISABLE_PRDR
1773 if ( checks & OPTION_PRDR
1774 && pcre_exec(regex_PRDR, NULL, CS buf, bsize, 0, PCRE_EOPT, NULL, 0) < 0)
1776 checks &= ~OPTION_PRDR;
1779 if ( checks & OPTION_UTF8
1780 && pcre_exec(regex_UTF8, NULL, CS buf, bsize, 0, PCRE_EOPT, NULL, 0) < 0)
1782 checks &= ~OPTION_UTF8;
1784 if ( checks & OPTION_DSN
1785 && pcre_exec(regex_DSN, NULL, CS buf, bsize, 0, PCRE_EOPT, NULL, 0) < 0)
1786 checks &= ~OPTION_DSN;
1788 if ( checks & OPTION_PIPE
1789 && pcre_exec(regex_PIPELINING, NULL, CS buf, bsize, 0,
1790 PCRE_EOPT, NULL, 0) < 0)
1791 checks &= ~OPTION_PIPE;
1793 if ( checks & OPTION_SIZE
1794 && pcre_exec(regex_SIZE, NULL, CS buf, bsize, 0, PCRE_EOPT, NULL, 0) < 0)
1795 checks &= ~OPTION_SIZE;
1797 #ifdef EXPERIMENTAL_PIPE_CONNECT
1798 if ( checks & OPTION_EARLY_PIPE
1799 && pcre_exec(regex_EARLY_PIPE, NULL, CS buf, bsize, 0,
1800 PCRE_EOPT, NULL, 0) < 0)
1802 checks &= ~OPTION_EARLY_PIPE;
1804 /* debug_printf("%s: found 0x%04x\n", __FUNCTION__, checks); */
1810 /* Callback for emitting a BDAT data chunk header.
1812 If given a nonzero size, first flush any buffered SMTP commands
1813 then emit the command.
1815 Reap previous SMTP command responses if requested, and always reap
1816 the response from a previous BDAT command.
1819 tctx transport context
1820 chunk_size value for SMTP BDAT command
1822 tc_chunk_last add LAST option to SMTP BDAT command
1823 tc_reap_prev reap response to previous SMTP commands
1827 DEFER TLS error on first read (EHLO-resp); errno set
1831 smtp_chunk_cmd_callback(transport_ctx * tctx, unsigned chunk_size,
1834 smtp_transport_options_block * ob = SOB tctx->tblock->options_block;
1835 smtp_context * sx = tctx->smtp_context;
1839 /* Write SMTP chunk header command. If not reaping responses, note that
1840 there may be more writes (like, the chunk data) done soon. */
1844 #ifdef EXPERIMENTAL_PIPE_CONNECT
1845 BOOL new_conn = !!(sx->outblock.conn_args);
1847 if((cmd_count = smtp_write_command(sx,
1848 flags & tc_reap_prev ? SCMD_FLUSH : SCMD_MORE,
1849 "BDAT %u%s\r\n", chunk_size, flags & tc_chunk_last ? " LAST" : "")
1850 ) < 0) return ERROR;
1851 if (flags & tc_chunk_last)
1852 data_command = string_copy(big_buffer); /* Save for later error message */
1853 #ifdef EXPERIMENTAL_PIPE_CONNECT
1854 /* That command write could have been the one that made the connection.
1855 Copy the fd from the client conn ctx (smtp transport specific) to the
1856 generic transport ctx. */
1859 tctx->u.fd = sx->outblock.cctx->sock;
1863 prev_cmd_count = cmd_count += sx->cmd_count;
1865 /* Reap responses for any previous, but not one we just emitted */
1869 if (sx->pending_BDAT)
1872 if (flags & tc_reap_prev && prev_cmd_count > 0)
1874 DEBUG(D_transport) debug_printf("look for %d responses"
1875 " for previous pipelined cmds\n", prev_cmd_count);
1877 switch(sync_responses(sx, prev_cmd_count, 0))
1879 case 1: /* 2xx (only) => OK */
1880 case 3: sx->good_RCPT = TRUE; /* 2xx & 5xx => OK & progress made */
1881 case 2: sx->completed_addr = TRUE; /* 5xx (only) => progress made */
1882 case 0: break; /* No 2xx or 5xx, but no probs */
1884 case -5: errno = ERRNO_TLSFAILURE;
1886 #ifdef EXPERIMENTAL_PIPE_CONNECT
1887 case -4: /* non-2xx for pipelined banner or EHLO */
1889 case -1: /* Timeout on RCPT */
1890 default: return ERROR; /* I/O error, or any MAIL/DATA error */
1893 if (!sx->pending_BDAT)
1894 pipelining_active = FALSE;
1897 /* Reap response for an outstanding BDAT */
1899 if (sx->pending_BDAT)
1901 DEBUG(D_transport) debug_printf("look for one response for BDAT\n");
1903 if (!smtp_read_response(sx, sx->buffer, sizeof(sx->buffer), '2',
1904 ob->command_timeout))
1906 if (errno == 0 && sx->buffer[0] == '4')
1908 errno = ERRNO_DATA4XX; /*XXX does this actually get used? */
1909 sx->addrlist->more_errno |=
1910 ((sx->buffer[1] - '0')*10 + sx->buffer[2] - '0') << 8;
1915 sx->pending_BDAT = FALSE;
1916 pipelining_active = FALSE;
1918 else if (chunk_size > 0)
1919 sx->pending_BDAT = TRUE;
1922 sx->cmd_count = cmd_count;
1930 /*************************************************
1931 * Make connection for given message *
1932 *************************************************/
1936 ctx connection context
1937 suppress_tls if TRUE, don't attempt a TLS connection - this is set for
1938 a second attempt after TLS initialization fails
1940 Returns: OK - the connection was made and the delivery attempted;
1941 fd is set in the conn context, tls_out set up.
1942 DEFER - the connection could not be made, or something failed
1943 while setting up the SMTP session, or there was a
1944 non-message-specific error, such as a timeout.
1945 ERROR - helo_data or add_headers or authenticated_sender is
1946 specified for this transport, and the string failed
1950 smtp_setup_conn(smtp_context * sx, BOOL suppress_tls)
1952 smtp_transport_options_block * ob = sx->conn_args.tblock->options_block;
1953 BOOL pass_message = FALSE;
1954 uschar * message = NULL;
1958 uschar * tls_errstr;
1961 sx->conn_args.ob = ob;
1963 sx->lmtp = strcmpic(ob->protocol, US"lmtp") == 0;
1964 sx->smtps = strcmpic(ob->protocol, US"smtps") == 0;
1966 sx->send_rset = TRUE;
1967 sx->send_quit = TRUE;
1968 sx->setting_up = TRUE;
1970 sx->esmtp_sent = FALSE;
1972 sx->utf8_needed = FALSE;
1974 sx->dsn_all_lasthop = TRUE;
1976 sx->conn_args.dane = FALSE;
1978 verify_check_given_host(CUSS &ob->hosts_require_dane, sx->conn_args.host) == OK;
1980 #ifdef EXPERIMENTAL_PIPE_CONNECT
1981 sx->early_pipe_active = sx->early_pipe_ok = FALSE;
1982 sx->ehlo_resp.cleartext_features = sx->ehlo_resp.crypted_features = 0;
1983 sx->pending_BANNER = sx->pending_EHLO = FALSE;
1986 if ((sx->max_rcpt = sx->conn_args.tblock->max_addresses) == 0) sx->max_rcpt = 999999;
1987 sx->peer_offered = 0;
1988 sx->avoid_option = 0;
1989 sx->igquotstr = US"";
1990 if (!sx->helo_data) sx->helo_data = ob->helo_data;
1991 #ifdef EXPERIMENTAL_DSN_INFO
1992 sx->smtp_greeting = NULL;
1993 sx->helo_response = NULL;
1996 smtp_command = US"initial connection";
1997 sx->buffer[0] = '\0';
1999 /* Set up the buffer for reading SMTP response packets. */
2001 sx->inblock.buffer = sx->inbuffer;
2002 sx->inblock.buffersize = sizeof(sx->inbuffer);
2003 sx->inblock.ptr = sx->inbuffer;
2004 sx->inblock.ptrend = sx->inbuffer;
2006 /* Set up the buffer for holding SMTP commands while pipelining */
2008 sx->outblock.buffer = sx->outbuffer;
2009 sx->outblock.buffersize = sizeof(sx->outbuffer);
2010 sx->outblock.ptr = sx->outbuffer;
2011 sx->outblock.cmd_count = 0;
2012 sx->outblock.authenticating = FALSE;
2013 sx->outblock.conn_args = NULL;
2015 /* Reset the parameters of a TLS session. */
2018 tls_out.cipher = NULL; /* the one we may use for this transport */
2019 tls_out.ourcert = NULL;
2020 tls_out.peercert = NULL;
2021 tls_out.peerdn = NULL;
2025 tls_out.ocsp = OCSP_NOT_REQ;
2026 #ifdef EXPERIMENTAL_TLS_RESUME
2027 tls_out.resumption = 0;
2030 /* Flip the legacy TLS-related variables over to the outbound set in case
2031 they're used in the context of the transport. Don't bother resetting
2032 afterward (when being used by a transport) as we're in a subprocess.
2033 For verify, unflipped once the callout is dealt with */
2035 tls_modify_variables(&tls_out);
2040 set_errno_nohost(sx->addrlist, ERRNO_TLSFAILURE, US"TLS support not available",
2046 /* Make a connection to the host if this isn't a continued delivery, and handle
2047 the initial interaction and HELO/EHLO/LHLO. Connect timeout errors are handled
2048 specially so they can be identified for retries. */
2050 if (!continue_hostname)
2053 HDEBUG(D_verify) debug_printf("interface=%s port=%d\n", sx->conn_args.interface, sx->port);
2055 /* Get the actual port the connection will use, into sx->conn_args.host */
2057 smtp_port_for_connect(sx->conn_args.host, sx->port);
2060 /* Do TLSA lookup for DANE */
2062 tls_out.dane_verified = FALSE;
2063 tls_out.tlsa_usage = 0;
2065 if (sx->conn_args.host->dnssec == DS_YES)
2067 if( sx->dane_required
2068 || verify_check_given_host(CUSS &ob->hosts_try_dane, sx->conn_args.host) == OK
2070 switch (rc = tlsa_lookup(sx->conn_args.host, &sx->conn_args.tlsa_dnsa, sx->dane_required))
2072 case OK: sx->conn_args.dane = TRUE;
2073 ob->tls_tempfail_tryclear = FALSE;
2075 case FAIL_FORCED: break;
2076 default: set_errno_nohost(sx->addrlist, ERRNO_DNSDEFER,
2077 string_sprintf("DANE error: tlsa lookup %s",
2080 # ifndef DISABLE_EVENT
2081 (void) event_raise(sx->conn_args.tblock->event_action,
2082 US"dane:fail", sx->dane_required
2083 ? US"dane-required" : US"dnssec-invalid");
2088 else if (sx->dane_required)
2090 set_errno_nohost(sx->addrlist, ERRNO_DNSDEFER,
2091 string_sprintf("DANE error: %s lookup not DNSSEC", sx->conn_args.host->name),
2093 # ifndef DISABLE_EVENT
2094 (void) event_raise(sx->conn_args.tblock->event_action,
2095 US"dane:fail", US"dane-required");
2102 /* Make the TCP connection */
2104 sx->cctx.tls_ctx = NULL;
2105 sx->inblock.cctx = sx->outblock.cctx = &sx->cctx;
2106 sx->avoid_option = sx->peer_offered = smtp_peer_options = 0;
2108 #ifdef EXPERIMENTAL_PIPE_CONNECT
2109 if (verify_check_given_host(CUSS &ob->hosts_pipe_connect, sx->conn_args.host) == OK)
2111 sx->early_pipe_ok = TRUE;
2112 if ( read_ehlo_cache_entry(sx)
2113 && sx->ehlo_resp.cleartext_features & OPTION_EARLY_PIPE)
2115 DEBUG(D_transport) debug_printf("Using cached cleartext PIPE_CONNECT\n");
2116 sx->early_pipe_active = TRUE;
2117 sx->peer_offered = sx->ehlo_resp.cleartext_features;
2121 if (sx->early_pipe_active)
2122 sx->outblock.conn_args = &sx->conn_args;
2126 if ((sx->cctx.sock = smtp_connect(&sx->conn_args, NULL)) < 0)
2128 uschar * msg = NULL;
2131 msg = US strerror(errno);
2132 HDEBUG(D_verify) debug_printf("connect: %s\n", msg);
2134 set_errno_nohost(sx->addrlist,
2135 errno == ETIMEDOUT ? ERRNO_CONNECTTIMEOUT : errno,
2136 sx->verify ? msg : NULL,
2138 sx->send_quit = FALSE;
2142 /* Expand the greeting message while waiting for the initial response. (Makes
2143 sense if helo_data contains ${lookup dnsdb ...} stuff). The expansion is
2144 delayed till here so that $sending_interface and $sending_port are set. */
2145 /*XXX early-pipe: they still will not be. Is there any way to find out what they
2146 will be? Somehow I doubt it. */
2149 if (!(sx->helo_data = expand_string(sx->helo_data)))
2151 log_write(0, LOG_MAIN|LOG_PANIC,
2152 "<%s>: failed to expand transport's helo_data value for callout: %s",
2153 sx->addrlist->address, expand_string_message);
2158 expand_string_message = NULL;
2159 if ((sx->helo_data = string_domain_utf8_to_alabel(sx->helo_data,
2160 &expand_string_message)),
2161 expand_string_message)
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);
2167 sx->helo_data = NULL;
2171 /* The first thing is to wait for an initial OK response. The dreaded "goto"
2172 is nevertheless a reasonably clean way of programming this kind of logic,
2173 where you want to escape on any error. */
2177 #ifdef EXPERIMENTAL_PIPE_CONNECT
2178 if (sx->early_pipe_active)
2180 sx->pending_BANNER = TRUE; /* sync_responses() must eventually handle */
2181 sx->outblock.cmd_count = 1;
2187 (void) setsockopt(sx->cctx.sock, IPPROTO_TCP, TCP_QUICKACK, US &off,
2190 if (!smtp_reap_banner(sx))
2191 goto RESPONSE_FAILED;
2194 #ifndef DISABLE_EVENT
2197 lookup_dnssec_authenticated = sx->conn_args.host->dnssec==DS_YES ? US"yes"
2198 : sx->conn_args.host->dnssec==DS_NO ? US"no" : NULL;
2199 s = event_raise(sx->conn_args.tblock->event_action, US"smtp:connect", sx->buffer);
2202 set_errno_nohost(sx->addrlist, ERRNO_EXPANDFAIL,
2203 string_sprintf("deferred by smtp:connect event expansion: %s", s),
2211 /* Now check if the helo_data expansion went well, and sign off cleanly if
2216 message = string_sprintf("failed to expand helo_data: %s",
2217 expand_string_message);
2218 set_errno_nohost(sx->addrlist, ERRNO_EXPANDFAIL, message, DEFER, FALSE);
2224 /** Debugging without sending a message
2225 sx->addrlist->transport_return = DEFER;
2229 /* Errors that occur after this point follow an SMTP command, which is
2230 left in big_buffer by smtp_write_command() for use in error messages. */
2232 smtp_command = big_buffer;
2234 /* Tell the remote who we are...
2236 February 1998: A convention has evolved that ESMTP-speaking MTAs include the
2237 string "ESMTP" in their greeting lines, so make Exim send EHLO if the
2238 greeting is of this form. The assumption was that the far end supports it
2239 properly... but experience shows that there are some that give 5xx responses,
2240 even though the banner includes "ESMTP" (there's a bloody-minded one that
2241 says "ESMTP not spoken here"). Cope with that case.
2243 September 2000: Time has passed, and it seems reasonable now to always send
2244 EHLO at the start. It is also convenient to make the change while installing
2247 July 2003: Joachim Wieland met a broken server that advertises "PIPELINING"
2248 but times out after sending MAIL FROM, RCPT TO and DATA all together. There
2249 would be no way to send out the mails, so there is now a host list
2250 "hosts_avoid_esmtp" that disables ESMTP for special hosts and solves the
2251 PIPELINING problem as well. Maybe it can also be useful to cure other
2252 problems with broken servers.
2254 Exim originally sent "Helo" at this point and ran for nearly a year that way.
2255 Then somebody tried it with a Microsoft mailer... It seems that all other
2256 mailers use upper case for some reason (the RFC is quite clear about case
2257 independence) so, for peace of mind, I gave in. */
2259 sx->esmtp = verify_check_given_host(CUSS &ob->hosts_avoid_esmtp, sx->conn_args.host) != OK;
2261 /* Alas; be careful, since this goto is not an error-out, so conceivably
2262 we might set data between here and the target which we assume to exist
2263 and be usable. I can see this coming back to bite us. */
2267 smtp_peer_options |= OPTION_TLS;
2268 suppress_tls = FALSE;
2269 ob->tls_tempfail_tryclear = FALSE;
2270 smtp_command = US"SSL-on-connect";
2277 if (smtp_write_command(sx,
2278 #ifdef EXPERIMENTAL_PIPE_CONNECT
2279 sx->early_pipe_active ? SCMD_BUFFER :
2282 "%s %s\r\n", sx->lmtp ? "LHLO" : "EHLO", sx->helo_data) < 0)
2284 sx->esmtp_sent = TRUE;
2286 #ifdef EXPERIMENTAL_PIPE_CONNECT
2287 if (sx->early_pipe_active)
2289 sx->pending_EHLO = TRUE;
2291 /* If we have too many authenticators to handle and might need to AUTH
2292 for this transport, pipeline no further as we will need the
2293 list of auth methods offered. Reap the banner and EHLO. */
2295 if ( (ob->hosts_require_auth || ob->hosts_try_auth)
2296 && f.smtp_in_early_pipe_no_auth)
2298 DEBUG(D_transport) debug_printf("may need to auth, so pipeline no further\n");
2299 if (smtp_write_command(sx, SCMD_FLUSH, NULL) < 0)
2301 if (sync_responses(sx, 2, 0) != 0)
2304 debug_printf("failed reaping pipelined cmd responses\n");
2305 goto RESPONSE_FAILED;
2307 sx->early_pipe_active = FALSE;
2312 if (!smtp_reap_ehlo(sx))
2313 goto RESPONSE_FAILED;
2317 debug_printf("not sending EHLO (host matches hosts_avoid_esmtp)\n");
2319 #ifdef EXPERIMENTAL_PIPE_CONNECT
2320 if (!sx->early_pipe_active)
2325 int n = sizeof(sx->buffer);
2326 uschar * rsp = sx->buffer;
2328 if (sx->esmtp_sent && (n = Ustrlen(sx->buffer)) < sizeof(sx->buffer)/2)
2329 { rsp = sx->buffer + n + 1; n = sizeof(sx->buffer) - n; }
2331 if (smtp_write_command(sx, SCMD_FLUSH, "HELO %s\r\n", sx->helo_data) < 0)
2333 good_response = smtp_read_response(sx, rsp, n, '2', ob->command_timeout);
2334 #ifdef EXPERIMENTAL_DSN_INFO
2335 sx->helo_response = string_copy(rsp);
2339 /* Handle special logging for a closed connection after HELO
2340 when had previously sent EHLO */
2342 if (rsp != sx->buffer && rsp[0] == 0 && (errno == 0 || errno == ECONNRESET))
2344 errno = ERRNO_SMTPCLOSED;
2345 goto EHLOHELO_FAILED;
2347 memmove(sx->buffer, rsp, Ustrlen(rsp));
2348 goto RESPONSE_FAILED;
2352 if (sx->esmtp || sx->lmtp)
2354 #ifdef EXPERIMENTAL_PIPE_CONNECT
2355 if (!sx->early_pipe_active)
2358 sx->peer_offered = ehlo_response(sx->buffer,
2359 OPTION_TLS /* others checked later */
2360 #ifdef EXPERIMENTAL_PIPE_CONNECT
2361 | (sx->early_pipe_ok
2363 | OPTION_CHUNKING | OPTION_PRDR | OPTION_DSN | OPTION_PIPE | OPTION_SIZE
2372 #ifdef EXPERIMENTAL_PIPE_CONNECT
2373 if (sx->early_pipe_ok)
2375 sx->ehlo_resp.cleartext_features = sx->peer_offered;
2377 if ( (sx->peer_offered & (OPTION_PIPE | OPTION_EARLY_PIPE))
2378 == (OPTION_PIPE | OPTION_EARLY_PIPE))
2380 DEBUG(D_transport) debug_printf("PIPE_CONNECT usable in future for this IP\n");
2381 sx->ehlo_resp.cleartext_auths = study_ehlo_auths(sx);
2382 write_ehlo_cache_entry(sx);
2388 /* Set tls_offered if the response to EHLO specifies support for STARTTLS. */
2391 smtp_peer_options |= sx->peer_offered & OPTION_TLS;
2396 /* For continuing deliveries down the same channel, having re-exec'd the socket
2397 is the standard input; for a socket held open from verify it is recorded
2398 in the cutthrough context block. Either way we don't need to redo EHLO here
2399 (but may need to do so for TLS - see below).
2400 Set up the pointer to where subsequent commands will be left, for
2401 error messages. Note that smtp_peer_options will have been
2402 set from the command line if they were set in the process that passed the
2405 /*XXX continue case needs to propagate DSN_INFO, prob. in deliver.c
2406 as the continue goes via transport_pass_socket() and doublefork and exec.
2407 It does not wait. Unclear how we keep separate host's responses
2408 separate - we could match up by host ip+port as a bodge. */
2412 if (cutthrough.cctx.sock >= 0 && cutthrough.callout_hold_only)
2414 sx->cctx = cutthrough.cctx;
2415 sx->conn_args.host->port = sx->port = cutthrough.host.port;
2419 sx->cctx.sock = 0; /* stdin */
2420 sx->cctx.tls_ctx = NULL;
2421 smtp_port_for_connect(sx->conn_args.host, sx->port); /* Record the port that was used */
2423 sx->inblock.cctx = sx->outblock.cctx = &sx->cctx;
2424 smtp_command = big_buffer;
2425 sx->helo_data = NULL; /* ensure we re-expand ob->helo_data */
2427 /* For a continued connection with TLS being proxied for us, or a
2428 held-open verify connection with TLS, nothing more to do. */
2430 if ( continue_proxy_cipher
2431 || (cutthrough.cctx.sock >= 0 && cutthrough.callout_hold_only
2432 && cutthrough.is_tls)
2435 sx->peer_offered = smtp_peer_options;
2436 sx->pipelining_used = pipelining_active = !!(smtp_peer_options & OPTION_PIPE);
2437 HDEBUG(D_transport) debug_printf("continued connection, %s TLS\n",
2438 continue_proxy_cipher ? "proxied" : "verify conn with");
2441 HDEBUG(D_transport) debug_printf("continued connection, no TLS\n");
2444 /* If TLS is available on this connection, whether continued or not, attempt to
2445 start up a TLS session, unless the host is in hosts_avoid_tls. If successful,
2446 send another EHLO - the server may give a different answer in secure mode. We
2447 use a separate buffer for reading the response to STARTTLS so that if it is
2448 negative, the original EHLO data is available for subsequent analysis, should
2449 the client not be required to use TLS. If the response is bad, copy the buffer
2450 for error analysis. */
2453 if ( smtp_peer_options & OPTION_TLS
2455 && verify_check_given_host(CUSS &ob->hosts_avoid_tls, sx->conn_args.host) != OK
2457 || verify_check_given_host(CUSS &ob->hosts_verify_avoid_tls, sx->conn_args.host) != OK
2460 uschar buffer2[4096];
2462 if (smtp_write_command(sx, SCMD_FLUSH, "STARTTLS\r\n") < 0)
2465 #ifdef EXPERIMENTAL_PIPE_CONNECT
2466 /* If doing early-pipelining reap the banner and EHLO-response but leave
2467 the response for the STARTTLS we just sent alone. */
2469 if (sx->early_pipe_active && sync_responses(sx, 2, 0) != 0)
2472 debug_printf("failed reaping pipelined cmd responses\n");
2473 goto RESPONSE_FAILED;
2477 /* If there is an I/O error, transmission of this message is deferred. If
2478 there is a temporary rejection of STARRTLS and tls_tempfail_tryclear is
2479 false, we also defer. However, if there is a temporary rejection of STARTTLS
2480 and tls_tempfail_tryclear is true, or if there is an outright rejection of
2481 STARTTLS, we carry on. This means we will try to send the message in clear,
2482 unless the host is in hosts_require_tls (tested below). */
2484 if (!smtp_read_response(sx, buffer2, sizeof(buffer2), '2', ob->command_timeout))
2488 || (buffer2[0] == '4' && !ob->tls_tempfail_tryclear)
2491 Ustrncpy(sx->buffer, buffer2, sizeof(sx->buffer));
2492 sx->buffer[sizeof(sx->buffer)-1] = '\0';
2493 goto RESPONSE_FAILED;
2497 /* STARTTLS accepted: try to negotiate a TLS session. */
2502 if (!tls_client_start(&sx->cctx, &sx->conn_args, sx->addrlist, &tls_out, &tls_errstr))
2504 /* TLS negotiation failed; give an error. From outside, this function may
2505 be called again to try in clear on a new connection, if the options permit
2506 it for this host. */
2510 DEBUG(D_tls) debug_printf("TLS session fail: %s\n", tls_errstr);
2512 # ifdef SUPPORT_DANE
2513 if (sx->conn_args.dane)
2515 log_write(0, LOG_MAIN,
2516 "DANE attempt failed; TLS connection to %s [%s]: %s",
2517 sx->conn_args.host->name, sx->conn_args.host->address, tls_errstr);
2518 # ifndef DISABLE_EVENT
2519 (void) event_raise(sx->conn_args.tblock->event_action,
2520 US"dane:fail", US"validation-failure"); /* could do with better detail */
2525 errno = ERRNO_TLSFAILURE;
2526 message = string_sprintf("TLS session: %s", tls_errstr);
2527 sx->send_quit = FALSE;
2531 /* TLS session is set up */
2533 smtp_peer_options_wrap = smtp_peer_options;
2534 for (address_item * addr = sx->addrlist; addr; addr = addr->next)
2535 if (addr->transport_return == PENDING_DEFER)
2537 addr->cipher = tls_out.cipher;
2538 addr->ourcert = tls_out.ourcert;
2539 addr->peercert = tls_out.peercert;
2540 addr->peerdn = tls_out.peerdn;
2541 addr->ocsp = tls_out.ocsp;
2546 /* if smtps, we'll have smtp_command set to something else; always safe to
2548 smtp_command = big_buffer;
2550 /* If we started TLS, redo the EHLO/LHLO exchange over the secure channel. If
2551 helo_data is null, we are dealing with a connection that was passed from
2552 another process, and so we won't have expanded helo_data above. We have to
2553 expand it here. $sending_ip_address and $sending_port are set up right at the
2554 start of the Exim process (in exim.c). */
2556 if (tls_out.active.sock >= 0)
2558 uschar * greeting_cmd;
2560 if (!sx->helo_data && !(sx->helo_data = expand_string(ob->helo_data)))
2562 uschar *message = string_sprintf("failed to expand helo_data: %s",
2563 expand_string_message);
2564 set_errno_nohost(sx->addrlist, ERRNO_EXPANDFAIL, message, DEFER, FALSE);
2569 #ifdef EXPERIMENTAL_PIPE_CONNECT
2570 /* For SMTPS there is no cleartext early-pipe; use the crypted permission bit.
2571 We're unlikely to get the group sent and delivered before the server sends its
2572 banner, but it's still worth sending as a group.
2573 For STARTTLS allow for cleartext early-pipe but no crypted early-pipe, but not
2576 if (sx->smtps ? sx->early_pipe_ok : sx->early_pipe_active)
2578 sx->peer_offered = sx->ehlo_resp.crypted_features;
2579 if ((sx->early_pipe_active =
2580 !!(sx->ehlo_resp.crypted_features & OPTION_EARLY_PIPE)))
2581 DEBUG(D_transport) debug_printf("Using cached crypted PIPE_CONNECT\n");
2585 /* For SMTPS we need to wait for the initial OK response. */
2587 #ifdef EXPERIMENTAL_PIPE_CONNECT
2588 if (sx->early_pipe_active)
2590 sx->pending_BANNER = TRUE;
2591 sx->outblock.cmd_count = 1;
2595 if (!smtp_reap_banner(sx))
2596 goto RESPONSE_FAILED;
2599 greeting_cmd = US"LHLO";
2601 greeting_cmd = US"EHLO";
2604 greeting_cmd = US"HELO";
2606 debug_printf("not sending EHLO (host matches hosts_avoid_esmtp)\n");
2609 if (smtp_write_command(sx,
2610 #ifdef EXPERIMENTAL_PIPE_CONNECT
2611 sx->early_pipe_active ? SCMD_BUFFER :
2614 "%s %s\r\n", greeting_cmd, sx->helo_data) < 0)
2617 #ifdef EXPERIMENTAL_PIPE_CONNECT
2618 if (sx->early_pipe_active)
2619 sx->pending_EHLO = TRUE;
2623 if (!smtp_reap_ehlo(sx))
2626 /* The GnuTLS layer in Exim only spots a server-rejection of a client
2627 cert late, under TLS1.3 - which means here; the first time we try to
2628 receive crypted data. Treat it as if it was a connect-time failure.
2629 See also the early-pipe equivalent... which will be hard; every call
2630 to sync_responses will need to check the result.
2631 It would be nicer to have GnuTLS check the cert during the handshake.
2632 Can it do that, with all the flexibility we need? */
2634 tls_errstr = US"error on first read";
2635 goto GNUTLS_CONN_FAILED;
2638 goto RESPONSE_FAILED;
2640 smtp_peer_options = 0;
2644 /* If the host is required to use a secure channel, ensure that we
2648 # ifdef SUPPORT_DANE
2649 || sx->conn_args.dane
2651 || verify_check_given_host(CUSS &ob->hosts_require_tls, sx->conn_args.host) == OK
2654 errno = ERRNO_TLSREQUIRED;
2655 message = string_sprintf("a TLS session is required, but %s",
2656 smtp_peer_options & OPTION_TLS
2657 ? "an attempt to start TLS failed" : "the server did not offer TLS support");
2658 # if defined(SUPPORT_DANE) && !defined(DISABLE_EVENT)
2659 if (sx->conn_args.dane)
2660 (void) event_raise(sx->conn_args.tblock->event_action, US"dane:fail",
2661 smtp_peer_options & OPTION_TLS
2662 ? US"validation-failure" /* could do with better detail */
2663 : US"starttls-not-supported");
2667 #endif /*DISABLE_TLS*/
2669 /* If TLS is active, we have just started it up and re-done the EHLO command,
2670 so its response needs to be analyzed. If TLS is not active and this is a
2671 continued session down a previously-used socket, we haven't just done EHLO, so
2674 if (continue_hostname == NULL
2676 || tls_out.active.sock >= 0
2680 if (sx->esmtp || sx->lmtp)
2682 #ifdef EXPERIMENTAL_PIPE_CONNECT
2683 if (!sx->early_pipe_active)
2686 sx->peer_offered = ehlo_response(sx->buffer,
2688 #ifdef EXPERIMENTAL_PIPE_CONNECT
2689 | (sx->lmtp && ob->lmtp_ignore_quota ? OPTION_IGNQ : 0)
2690 | OPTION_DSN | OPTION_PIPE | OPTION_SIZE
2691 | OPTION_CHUNKING | OPTION_PRDR | OPTION_UTF8
2692 | (tls_out.active.sock >= 0 ? OPTION_EARLY_PIPE : 0) /* not for lmtp */
2696 | (sx->lmtp && ob->lmtp_ignore_quota ? OPTION_IGNQ : 0)
2699 # ifdef SUPPORT_I18N
2700 | (sx->addrlist->prop.utf8_msg ? OPTION_UTF8 : 0)
2701 /*XXX if we hand peercaps on to continued-conn processes,
2702 must not depend on this addr */
2706 | (ob->size_addition >= 0 ? OPTION_SIZE : 0)
2709 #ifdef EXPERIMENTAL_PIPE_CONNECT
2710 if (tls_out.active.sock >= 0)
2711 sx->ehlo_resp.crypted_features = sx->peer_offered;
2715 /* Set for IGNOREQUOTA if the response to LHLO specifies support and the
2716 lmtp_ignore_quota option was set. */
2718 sx->igquotstr = sx->peer_offered & OPTION_IGNQ ? US" IGNOREQUOTA" : US"";
2720 /* If the response to EHLO specified support for the SIZE parameter, note
2721 this, provided size_addition is non-negative. */
2723 smtp_peer_options |= sx->peer_offered & OPTION_SIZE;
2725 /* Note whether the server supports PIPELINING. If hosts_avoid_esmtp matched
2726 the current host, esmtp will be false, so PIPELINING can never be used. If
2727 the current host matches hosts_avoid_pipelining, don't do it. */
2729 if ( sx->peer_offered & OPTION_PIPE
2730 && verify_check_given_host(CUSS &ob->hosts_avoid_pipelining, sx->conn_args.host) != OK)
2731 smtp_peer_options |= OPTION_PIPE;
2733 DEBUG(D_transport) debug_printf("%susing PIPELINING\n",
2734 smtp_peer_options & OPTION_PIPE ? "" : "not ");
2736 if ( sx->peer_offered & OPTION_CHUNKING
2737 && verify_check_given_host(CUSS &ob->hosts_try_chunking, sx->conn_args.host) != OK)
2738 sx->peer_offered &= ~OPTION_CHUNKING;
2740 if (sx->peer_offered & OPTION_CHUNKING)
2741 DEBUG(D_transport) debug_printf("CHUNKING usable\n");
2743 #ifndef DISABLE_PRDR
2744 if ( sx->peer_offered & OPTION_PRDR
2745 && verify_check_given_host(CUSS &ob->hosts_try_prdr, sx->conn_args.host) != OK)
2746 sx->peer_offered &= ~OPTION_PRDR;
2748 if (sx->peer_offered & OPTION_PRDR)
2749 DEBUG(D_transport) debug_printf("PRDR usable\n");
2752 /* Note if the server supports DSN */
2753 smtp_peer_options |= sx->peer_offered & OPTION_DSN;
2754 DEBUG(D_transport) debug_printf("%susing DSN\n",
2755 sx->peer_offered & OPTION_DSN ? "" : "not ");
2757 #ifdef EXPERIMENTAL_PIPE_CONNECT
2758 if ( sx->early_pipe_ok
2759 && !sx->early_pipe_active
2760 && tls_out.active.sock >= 0
2761 && smtp_peer_options & OPTION_PIPE
2762 && ( sx->ehlo_resp.cleartext_features | sx->ehlo_resp.crypted_features)
2763 & OPTION_EARLY_PIPE)
2765 DEBUG(D_transport) debug_printf("PIPE_CONNECT usable in future for this IP\n");
2766 sx->ehlo_resp.crypted_auths = study_ehlo_auths(sx);
2767 write_ehlo_cache_entry(sx);
2771 /* Note if the response to EHLO specifies support for the AUTH extension.
2772 If it has, check that this host is one we want to authenticate to, and do
2773 the business. The host name and address must be available when the
2774 authenticator's client driver is running. */
2776 switch (yield = smtp_auth(sx))
2778 default: goto SEND_QUIT;
2780 case FAIL_SEND: goto SEND_FAILED;
2781 case FAIL: goto RESPONSE_FAILED;
2785 sx->pipelining_used = pipelining_active = !!(smtp_peer_options & OPTION_PIPE);
2787 /* The setting up of the SMTP call is now complete. Any subsequent errors are
2788 message-specific. */
2790 sx->setting_up = FALSE;
2793 if (sx->addrlist->prop.utf8_msg)
2797 /* If the transport sets a downconversion mode it overrides any set by ACL
2800 if ((s = ob->utf8_downconvert))
2802 if (!(s = expand_string(s)))
2804 message = string_sprintf("failed to expand utf8_downconvert: %s",
2805 expand_string_message);
2806 set_errno_nohost(sx->addrlist, ERRNO_EXPANDFAIL, message, DEFER, FALSE);
2812 case '1': sx->addrlist->prop.utf8_downcvt = TRUE;
2813 sx->addrlist->prop.utf8_downcvt_maybe = FALSE;
2815 case '0': sx->addrlist->prop.utf8_downcvt = FALSE;
2816 sx->addrlist->prop.utf8_downcvt_maybe = FALSE;
2818 case '-': if (s[1] == '1')
2820 sx->addrlist->prop.utf8_downcvt = FALSE;
2821 sx->addrlist->prop.utf8_downcvt_maybe = TRUE;
2827 sx->utf8_needed = !sx->addrlist->prop.utf8_downcvt
2828 && !sx->addrlist->prop.utf8_downcvt_maybe;
2829 DEBUG(D_transport) if (!sx->utf8_needed)
2830 debug_printf("utf8: %s downconvert\n",
2831 sx->addrlist->prop.utf8_downcvt ? "mandatory" : "optional");
2834 /* If this is an international message we need the host to speak SMTPUTF8 */
2835 if (sx->utf8_needed && !(sx->peer_offered & OPTION_UTF8))
2837 errno = ERRNO_UTF8_FWD;
2838 goto RESPONSE_FAILED;
2840 #endif /*SUPPORT_I18N*/
2850 sx->send_quit = check_response(sx->conn_args.host, &errno, sx->addrlist->more_errno,
2851 sx->buffer, &code, &message, &pass_message);
2857 message = US string_sprintf("send() to %s [%s] failed: %s",
2858 sx->conn_args.host->name, sx->conn_args.host->address, strerror(errno));
2859 sx->send_quit = FALSE;
2865 message = string_sprintf("Remote host closed connection in response to %s"
2866 " (EHLO response was: %s)", smtp_command, sx->buffer);
2867 sx->send_quit = FALSE;
2871 /* This label is jumped to directly when a TLS negotiation has failed,
2872 or was not done for a host for which it is required. Values will be set
2873 in message and errno, and setting_up will always be true. Treat as
2874 a temporary error. */
2878 code = '4', yield = DEFER;
2882 /* The failure happened while setting up the call; see if the failure was
2883 a 5xx response (this will either be on connection, or following HELO - a 5xx
2884 after EHLO causes it to try HELO). If so, and there are no more hosts to try,
2885 fail all addresses, as this host is never going to accept them. For other
2886 errors during setting up (timeouts or whatever), defer all addresses, and
2887 yield DEFER, so that the host is not tried again for a while.
2889 XXX This peeking for another host feels like a layering violation. We want
2890 to note the host as unusable, but down here we shouldn't know if this was
2891 the last host to try for the addr(list). Perhaps the upper layer should be
2892 the one to do set_errno() ? The problem is that currently the addr is where
2893 errno etc. are stashed, but until we run out of hosts to try the errors are
2894 host-specific. Maybe we should enhance the host_item definition? */
2897 sx->ok = FALSE; /* For when reached by GOTO */
2898 set_errno(sx->addrlist, errno, message,
2899 sx->conn_args.host->next
2903 || errno == ERRNO_UTF8_FWD
2906 pass_message, sx->conn_args.host
2907 #ifdef EXPERIMENTAL_DSN_INFO
2908 , sx->smtp_greeting, sx->helo_response
2917 (void)smtp_write_command(sx, SCMD_FLUSH, "QUIT\r\n");
2920 if (sx->cctx.tls_ctx)
2922 tls_close(sx->cctx.tls_ctx, TLS_SHUTDOWN_NOWAIT);
2923 sx->cctx.tls_ctx = NULL;
2927 /* Close the socket, and return the appropriate value, first setting
2928 works because the NULL setting is passed back to the calling process, and
2929 remote_max_parallel is forced to 1 when delivering over an existing connection,
2932 HDEBUG(D_transport|D_acl|D_v) debug_printf_indent(" SMTP(close)>>\n");
2935 shutdown(sx->cctx.sock, SHUT_WR);
2936 if (fcntl(sx->cctx.sock, F_SETFL, O_NONBLOCK) == 0)
2937 for (int i = 16; read(sx->cctx.sock, sx->inbuffer, sizeof(sx->inbuffer)) > 0 && i > 0;)
2938 i--; /* drain socket */
2939 sx->send_quit = FALSE;
2941 (void)close(sx->cctx.sock);
2944 #ifndef DISABLE_EVENT
2945 (void) event_raise(sx->conn_args.tblock->event_action, US"tcp:close", NULL);
2948 continue_transport = NULL;
2949 continue_hostname = NULL;
2956 /* Create the string of options that will be appended to the MAIL FROM:
2957 in the connection context buffer */
2960 build_mailcmd_options(smtp_context * sx, address_item * addrlist)
2962 uschar * p = sx->buffer;
2963 address_item * addr;
2968 /* If we know the receiving MTA supports the SIZE qualification, and we know it,
2969 send it, adding something to the message size to allow for imprecision
2970 and things that get added en route. Exim keeps the number of lines
2971 in a message, so we can give an accurate value for the original message, but we
2972 need some additional to handle added headers. (Double "." characters don't get
2973 included in the count.) */
2975 if ( message_size > 0
2976 && sx->peer_offered & OPTION_SIZE && !(sx->avoid_option & OPTION_SIZE))
2978 /*XXX problem here under spool_files_wireformat?
2979 Or just forget about lines? Or inflate by a fixed proportion? */
2981 sprintf(CS p, " SIZE=%d", message_size+message_linecount+(SOB sx->conn_args.ob)->size_addition);
2985 #ifndef DISABLE_PRDR
2986 /* If it supports Per-Recipient Data Responses, and we have more than one recipient,
2989 sx->prdr_active = FALSE;
2990 if (sx->peer_offered & OPTION_PRDR)
2991 for (address_item * addr = addrlist; addr; addr = addr->next)
2992 if (addr->transport_return == PENDING_DEFER)
2994 for (addr = addr->next; addr; addr = addr->next)
2995 if (addr->transport_return == PENDING_DEFER)
2996 { /* at least two recipients to send */
2997 sx->prdr_active = TRUE;
2998 sprintf(CS p, " PRDR"); p += 5;
3006 /* If it supports internationalised messages, and this meesage need that,
3009 if ( sx->peer_offered & OPTION_UTF8
3010 && addrlist->prop.utf8_msg
3011 && !addrlist->prop.utf8_downcvt
3013 Ustrcpy(p, " SMTPUTF8"), p += 9;
3016 /* check if all addresses have DSN-lasthop flag; do not send RET and ENVID if so */
3017 for (sx->dsn_all_lasthop = TRUE, addr = addrlist, address_count = 0;
3018 addr && address_count < sx->max_rcpt;
3019 addr = addr->next) if (addr->transport_return == PENDING_DEFER)
3022 if (!(addr->dsn_flags & rf_dsnlasthop))
3024 sx->dsn_all_lasthop = FALSE;
3029 /* Add any DSN flags to the mail command */
3031 if (sx->peer_offered & OPTION_DSN && !sx->dsn_all_lasthop)
3033 if (dsn_ret == dsn_ret_hdrs)
3034 { Ustrcpy(p, " RET=HDRS"); p += 9; }
3035 else if (dsn_ret == dsn_ret_full)
3036 { Ustrcpy(p, " RET=FULL"); p += 9; }
3040 string_format(p, sizeof(sx->buffer) - (p-sx->buffer), " ENVID=%s", dsn_envid);
3045 /* If an authenticated_sender override has been specified for this transport
3046 instance, expand it. If the expansion is forced to fail, and there was already
3047 an authenticated_sender for this message, the original value will be used.
3048 Other expansion failures are serious. An empty result is ignored, but there is
3049 otherwise no check - this feature is expected to be used with LMTP and other
3050 cases where non-standard addresses (e.g. without domains) might be required. */
3052 if (smtp_mail_auth_str(p, sizeof(sx->buffer) - (p-sx->buffer), addrlist, sx->conn_args.ob))
3060 build_rcptcmd_options(smtp_context * sx, const address_item * addr)
3062 uschar * p = sx->buffer;
3065 /* Add any DSN flags to the rcpt command */
3067 if (sx->peer_offered & OPTION_DSN && !(addr->dsn_flags & rf_dsnlasthop))
3069 if (addr->dsn_flags & rf_dsnflags)
3073 Ustrcpy(p, " NOTIFY=");
3075 for (int i = 0; i < nelem(rf_list); i++) if (addr->dsn_flags & rf_list[i])
3077 if (!first) *p++ = ',';
3079 Ustrcpy(p, rf_names[i]);
3084 if (addr->dsn_orcpt)
3086 string_format(p, sizeof(sx->buffer) - (p-sx->buffer), " ORCPT=%s",
3097 0 good, rcpt results in addr->transport_return (PENDING_OK, DEFER, FAIL)
3098 -1 MAIL response error
3099 -2 any non-MAIL read i/o error
3100 -3 non-MAIL response timeout
3101 -4 internal error; channel still usable
3106 smtp_write_mail_and_rcpt_cmds(smtp_context * sx, int * yield)
3108 address_item * addr;
3112 if (build_mailcmd_options(sx, sx->first_addr) != OK)
3118 /* From here until we send the DATA command, we can make use of PIPELINING
3119 if the server host supports it. The code has to be able to check the responses
3120 at any point, for when the buffer fills up, so we write it totally generally.
3121 When PIPELINING is off, each command written reports that it has flushed the
3124 sx->pending_MAIL = TRUE; /* The block starts with MAIL */
3127 uschar * s = sx->from_addr;
3129 uschar * errstr = NULL;
3131 /* If we must downconvert, do the from-address here. Remember we had to
3132 for the to-addresses (done below), and also (ugly) for re-doing when building
3133 the delivery log line. */
3135 if ( sx->addrlist->prop.utf8_msg
3136 && (sx->addrlist->prop.utf8_downcvt || !(sx->peer_offered & OPTION_UTF8))
3139 if (s = string_address_utf8_to_alabel(s, &errstr), errstr)
3141 set_errno_nohost(sx->addrlist, ERRNO_EXPANDFAIL, errstr, DEFER, FALSE);
3145 setflag(sx->addrlist, af_utf8_downcvt);
3149 rc = smtp_write_command(sx, pipelining_active ? SCMD_BUFFER : SCMD_FLUSH,
3150 "MAIL FROM:<%s>%s\r\n", s, sx->buffer);
3153 mail_command = string_copy(big_buffer); /* Save for later error message */
3157 case -1: /* Transmission error */
3160 case +1: /* Cmd was sent */
3161 if (!smtp_read_response(sx, sx->buffer, sizeof(sx->buffer), '2',
3162 (SOB sx->conn_args.ob)->command_timeout))
3164 if (errno == 0 && sx->buffer[0] == '4')
3166 errno = ERRNO_MAIL4XX;
3167 sx->addrlist->more_errno |= ((sx->buffer[1] - '0')*10 + sx->buffer[2] - '0') << 8;
3171 sx->pending_MAIL = FALSE;
3174 /* otherwise zero: command queued for pipeline */
3177 /* Pass over all the relevant recipient addresses for this host, which are the
3178 ones that have status PENDING_DEFER. If we are using PIPELINING, we can send
3179 several before we have to read the responses for those seen so far. This
3180 checking is done by a subroutine because it also needs to be done at the end.
3181 Send only up to max_rcpt addresses at a time, leaving next_addr pointing to
3182 the next one if not all are sent.
3184 In the MUA wrapper situation, we want to flush the PIPELINING buffer for the
3185 last address because we want to abort if any recipients have any kind of
3186 problem, temporary or permanent. We know that all recipient addresses will have
3187 the PENDING_DEFER status, because only one attempt is ever made, and we know
3188 that max_rcpt will be large, so all addresses will be done at once.
3190 For verify we flush the pipeline after any (the only) rcpt address. */
3192 for (addr = sx->first_addr, address_count = 0;
3193 addr && address_count < sx->max_rcpt;
3194 addr = addr->next) if (addr->transport_return == PENDING_DEFER)
3200 addr->dsn_aware = sx->peer_offered & OPTION_DSN
3201 ? dsn_support_yes : dsn_support_no;
3204 no_flush = pipelining_active && !sx->verify
3205 && (!mua_wrapper || addr->next && address_count < sx->max_rcpt);
3207 build_rcptcmd_options(sx, addr);
3209 /* Now send the RCPT command, and process outstanding responses when
3210 necessary. After a timeout on RCPT, we just end the function, leaving the
3211 yield as OK, because this error can often mean that there is a problem with
3212 just one address, so we don't want to delay the host. */
3214 rcpt_addr = transport_rcpt_address(addr, sx->conn_args.tblock->rcpt_include_affixes);
3217 if ( testflag(sx->addrlist, af_utf8_downcvt)
3218 && !(rcpt_addr = string_address_utf8_to_alabel(rcpt_addr, NULL))
3221 /*XXX could we use a per-address errstr here? Not fail the whole send? */
3222 errno = ERRNO_EXPANDFAIL;
3223 return -5; /*XXX too harsh? */
3227 count = smtp_write_command(sx, no_flush ? SCMD_BUFFER : SCMD_FLUSH,
3228 "RCPT TO:<%s>%s%s\r\n", rcpt_addr, sx->igquotstr, sx->buffer);
3230 if (count < 0) return -5;
3233 switch(sync_responses(sx, count, 0))
3235 case 3: sx->ok = TRUE; /* 2xx & 5xx => OK & progress made */
3236 case 2: sx->completed_addr = TRUE; /* 5xx (only) => progress made */
3239 case 1: sx->ok = TRUE; /* 2xx (only) => OK, but if LMTP, */
3240 if (!sx->lmtp) /* can't tell about progress yet */
3241 sx->completed_addr = TRUE;
3242 case 0: /* No 2xx or 5xx, but no probs */
3245 case -1: return -3; /* Timeout on RCPT */
3246 case -2: return -2; /* non-MAIL read i/o error */
3247 default: return -1; /* any MAIL error */
3249 #ifdef EXPERIMENTAL_PIPE_CONNECT
3250 case -4: return -1; /* non-2xx for pipelined banner or EHLO */
3251 case -5: return -1; /* TLS first-read error */
3254 sx->pending_MAIL = FALSE; /* Dealt with MAIL */
3256 } /* Loop for next address */
3258 sx->next_addr = addr;
3264 /*****************************************************
3265 * Proxy TLS connection for another transport process *
3266 ******************************************************/
3268 Close the unused end of the pipe, fork once more, then use the given buffer
3269 as a staging area, and select on both the given fd and the TLS'd client-fd for
3270 data to read (per the coding in ip_recv() and fd_ready() this is legitimate).
3271 Do blocking full-size writes, and reads under a timeout. Once both input
3272 channels are closed, exit the process.
3276 buf space to use for buffering
3277 bufsiz size of buffer
3278 pfd pipe filedescriptor array; [0] is comms to proxied process
3279 timeout per-read timeout, seconds
3283 smtp_proxy_tls(void * ct_ctx, uschar * buf, size_t bsize, int * pfd,
3287 int max_fd = MAX(pfd[0], tls_out.active.sock) + 1;
3293 DEBUG(D_transport) debug_printf("proxy-proc final-pid %d\n", rc);
3294 _exit(rc < 0 ? EXIT_FAILURE : EXIT_SUCCESS);
3297 if (f.running_in_test_harness) millisleep(100); /* let parent debug out */
3298 set_process_info("proxying TLS connection for continued transport");
3300 FD_SET(tls_out.active.sock, &rfds);
3301 FD_SET(pfd[0], &rfds);
3303 for (int fd_bits = 3; fd_bits; )
3305 time_t time_left = timeout;
3306 time_t time_start = time(NULL);
3312 struct timeval tv = { time_left, 0 };
3315 (SELECT_ARG2_TYPE *)&rfds, NULL, (SELECT_ARG2_TYPE *)&efds, &tv);
3317 if (rc < 0 && errno == EINTR)
3318 if ((time_left -= time(NULL) - time_start) > 0) continue;
3322 DEBUG(D_transport) if (rc == 0) debug_printf("%s: timed out\n", __FUNCTION__);
3326 if (FD_ISSET(tls_out.active.sock, &efds) || FD_ISSET(pfd[0], &efds))
3328 DEBUG(D_transport) debug_printf("select: exceptional cond on %s fd\n",
3329 FD_ISSET(pfd[0], &efds) ? "proxy" : "tls");
3333 while (rc < 0 || !(FD_ISSET(tls_out.active.sock, &rfds) || FD_ISSET(pfd[0], &rfds)));
3335 /* handle inbound data */
3336 if (FD_ISSET(tls_out.active.sock, &rfds))
3337 if ((rc = tls_read(ct_ctx, buf, bsize)) <= 0)
3340 FD_CLR(tls_out.active.sock, &rfds);
3341 shutdown(pfd[0], SHUT_WR);
3346 for (int nbytes = 0; rc - nbytes > 0; nbytes += i)
3347 if ((i = write(pfd[0], buf + nbytes, rc - nbytes)) < 0) goto done;
3349 else if (fd_bits & 1)
3350 FD_SET(tls_out.active.sock, &rfds);
3352 /* handle outbound data */
3353 if (FD_ISSET(pfd[0], &rfds))
3354 if ((rc = read(pfd[0], buf, bsize)) <= 0)
3357 tls_close(ct_ctx, TLS_SHUTDOWN_NOWAIT);
3362 for (int nbytes = 0; rc - nbytes > 0; nbytes += i)
3363 if ((i = tls_write(ct_ctx, buf + nbytes, rc - nbytes, FALSE)) < 0)
3366 else if (fd_bits & 2)
3367 FD_SET(pfd[0], &rfds);
3371 if (f.running_in_test_harness) millisleep(100); /* let logging complete */
3372 exim_exit(0, US"TLS proxy");
3377 /*************************************************
3378 * Deliver address list to given host *
3379 *************************************************/
3381 /* If continue_hostname is not null, we get here only when continuing to
3382 deliver down an existing channel. The channel was passed as the standard
3383 input. TLS is never active on a passed channel; the previous process always
3384 closes it down before passing the connection on.
3386 Otherwise, we have to make a connection to the remote host, and do the
3387 initial protocol exchange.
3389 When running as an MUA wrapper, if the sender or any recipient is rejected,
3390 temporarily or permanently, we force failure for all recipients.
3393 addrlist chain of potential addresses to deliver; only those whose
3394 transport_return field is set to PENDING_DEFER are currently
3395 being processed; others should be skipped - they have either
3396 been delivered to an earlier host or IP address, or been
3397 failed by one of them.
3398 host host to deliver to
3399 host_af AF_INET or AF_INET6
3400 defport default TCP/IP port to use if host does not specify, in host
3402 interface interface to bind to, or NULL
3403 tblock transport instance block
3404 message_defer set TRUE if yield is OK, but all addresses were deferred
3405 because of a non-recipient, non-host failure, that is, a
3406 4xx response to MAIL FROM, DATA, or ".". This is a defer
3407 that is specific to the message.
3408 suppress_tls if TRUE, don't attempt a TLS connection - this is set for
3409 a second attempt after TLS initialization fails
3411 Returns: OK - the connection was made and the delivery attempted;
3412 the result for each address is in its data block.
3413 DEFER - the connection could not be made, or something failed
3414 while setting up the SMTP session, or there was a
3415 non-message-specific error, such as a timeout.
3416 ERROR - a filter command is specified for this transport,
3417 and there was a problem setting it up; OR helo_data
3418 or add_headers or authenticated_sender is specified
3419 for this transport, and the string failed to expand
3423 smtp_deliver(address_item *addrlist, host_item *host, int host_af, int defport,
3424 uschar *interface, transport_instance *tblock,
3425 BOOL *message_defer, BOOL suppress_tls)
3427 smtp_transport_options_block * ob = SOB tblock->options_block;
3431 struct timeval start_delivery_time;
3433 BOOL pass_message = FALSE;
3434 uschar *message = NULL;
3435 uschar new_message_id[MESSAGE_ID_LENGTH + 1];
3439 gettimeofday(&start_delivery_time, NULL);
3440 suppress_tls = suppress_tls; /* stop compiler warning when no TLS support */
3441 *message_defer = FALSE;
3443 sx.addrlist = addrlist;
3444 sx.conn_args.host = host;
3445 sx.conn_args.host_af = host_af,
3447 sx.conn_args.interface = interface;
3448 sx.helo_data = NULL;
3449 sx.conn_args.tblock = tblock;
3451 sx.sync_addr = sx.first_addr = addrlist;
3453 /* Get the channel set up ready for a message (MAIL FROM being the next
3454 SMTP command to send */
3456 if ((rc = smtp_setup_conn(&sx, suppress_tls)) != OK)
3459 /* If there is a filter command specified for this transport, we can now
3460 set it up. This cannot be done until the identify of the host is known. */
3462 if (tblock->filter_command)
3464 transport_filter_timeout = tblock->filter_timeout;
3466 /* On failure, copy the error to all addresses, abandon the SMTP call, and
3469 if (!transport_set_up_command(&transport_filter_argv,
3470 tblock->filter_command, TRUE, DEFER, addrlist,
3471 string_sprintf("%.50s transport", tblock->name), NULL))
3473 set_errno_nohost(addrlist->next, addrlist->basic_errno, addrlist->message, DEFER,
3479 if ( transport_filter_argv
3480 && *transport_filter_argv
3481 && **transport_filter_argv
3482 && sx.peer_offered & OPTION_CHUNKING
3485 sx.peer_offered &= ~OPTION_CHUNKING;
3486 DEBUG(D_transport) debug_printf("CHUNKING not usable due to transport filter\n");
3490 /* For messages that have more than the maximum number of envelope recipients,
3491 we want to send several transactions down the same SMTP connection. (See
3492 comments in deliver.c as to how this reconciles, heuristically, with
3493 remote_max_parallel.) This optimization was added to Exim after the following
3494 code was already working. The simplest way to put it in without disturbing the
3495 code was to use a goto to jump back to this point when there is another
3496 transaction to handle. */
3499 sx.from_addr = return_path;
3500 sx.sync_addr = sx.first_addr;
3502 sx.send_rset = TRUE;
3503 sx.completed_addr = FALSE;
3506 /* If we are a continued-connection-after-verify the MAIL and RCPT
3507 commands were already sent; do not re-send but do mark the addrs as
3508 having been accepted up to RCPT stage. A traditional cont-conn
3509 always has a sequence number greater than one. */
3511 if (continue_hostname && continue_sequence == 1)
3513 sx.peer_offered = smtp_peer_options;
3514 sx.pending_MAIL = FALSE;
3516 sx.next_addr = NULL;
3518 for (address_item * addr = addrlist; addr; addr = addr->next)
3519 addr->transport_return = PENDING_OK;
3523 /* Initiate a message transfer. */
3525 switch(smtp_write_mail_and_rcpt_cmds(&sx, &yield))
3528 case -1: case -2: goto RESPONSE_FAILED;
3529 case -3: goto END_OFF;
3530 case -4: goto SEND_QUIT;
3531 default: goto SEND_FAILED;
3534 /* If we are an MUA wrapper, abort if any RCPTs were rejected, either
3535 permanently or temporarily. We should have flushed and synced after the last
3543 for (a = sx.first_addr, cnt = 0; a && cnt < sx.max_rcpt; a = a->next, cnt++)
3544 if (a->transport_return != PENDING_OK)
3546 /*XXX could we find a better errno than 0 here? */
3547 set_errno_nohost(addrlist, 0, a->message, FAIL,
3548 testflag(a, af_pass_message));
3555 /* If ok is TRUE, we know we have got at least one good recipient, and must now
3556 send DATA, but if it is FALSE (in the normal, non-wrapper case), we may still
3557 have a good recipient buffered up if we are pipelining. We don't want to waste
3558 time sending DATA needlessly, so we only send it if either ok is TRUE or if we
3559 are pipelining. The responses are all handled by sync_responses().
3560 If using CHUNKING, do not send a BDAT until we know how big a chunk we want
3563 if ( !(sx.peer_offered & OPTION_CHUNKING)
3564 && (sx.ok || (pipelining_active && !mua_wrapper)))
3566 int count = smtp_write_command(&sx, SCMD_FLUSH, "DATA\r\n");
3568 if (count < 0) goto SEND_FAILED;
3569 switch(sync_responses(&sx, count, sx.ok ? +1 : -1))
3571 case 3: sx.ok = TRUE; /* 2xx & 5xx => OK & progress made */
3572 case 2: sx.completed_addr = TRUE; /* 5xx (only) => progress made */
3575 case 1: sx.ok = TRUE; /* 2xx (only) => OK, but if LMTP, */
3576 if (!sx.lmtp) sx.completed_addr = TRUE; /* can't tell about progress yet */
3577 case 0: break; /* No 2xx or 5xx, but no probs */
3579 case -1: goto END_OFF; /* Timeout on RCPT */
3581 #ifdef EXPERIMENTAL_PIPE_CONNECT
3582 case -5: /* TLS first-read error */
3583 case -4: HDEBUG(D_transport)
3584 debug_printf("failed reaping pipelined cmd responses\n");
3586 default: goto RESPONSE_FAILED; /* I/O error, or any MAIL/DATA error */
3588 pipelining_active = FALSE;
3589 data_command = string_copy(big_buffer); /* Save for later error message */
3592 /* If there were no good recipients (but otherwise there have been no
3593 problems), just set ok TRUE, since we have handled address-specific errors
3594 already. Otherwise, it's OK to send the message. Use the check/escape mechanism
3595 for handling the SMTP dot-handling protocol, flagging to apply to headers as
3596 well as body. Set the appropriate timeout value to be used for each chunk.
3597 (Haven't been able to make it work using select() for writing yet.) */
3599 if (!(sx.peer_offered & OPTION_CHUNKING) && !sx.ok)
3601 /* Save the first address of the next batch. */
3602 sx.first_addr = sx.next_addr;
3608 transport_ctx tctx = {
3609 .u = {.fd = sx.cctx.sock}, /*XXX will this need TLS info? */
3612 .check_string = US".",
3613 .escape_string = US"..", /* Escaping strings */
3615 topt_use_crlf | topt_escape_headers
3616 | (tblock->body_only ? topt_no_headers : 0)
3617 | (tblock->headers_only ? topt_no_body : 0)
3618 | (tblock->return_path_add ? topt_add_return_path : 0)
3619 | (tblock->delivery_date_add ? topt_add_delivery_date : 0)
3620 | (tblock->envelope_to_add ? topt_add_envelope_to : 0)
3623 /* If using CHUNKING we need a callback from the generic transport
3624 support to us, for the sending of BDAT smtp commands and the reaping
3625 of responses. The callback needs a whole bunch of state so set up
3626 a transport-context structure to be passed around. */
3628 if (sx.peer_offered & OPTION_CHUNKING)
3630 tctx.check_string = tctx.escape_string = NULL;
3631 tctx.options |= topt_use_bdat;
3632 tctx.chunk_cb = smtp_chunk_cmd_callback;
3633 sx.pending_BDAT = FALSE;
3634 sx.good_RCPT = sx.ok;
3636 tctx.smtp_context = &sx;
3639 tctx.options |= topt_end_dot;
3641 /* Save the first address of the next batch. */
3642 sx.first_addr = sx.next_addr;
3644 /* Responses from CHUNKING commands go in buffer. Otherwise,
3645 there has not been a response. */
3649 sigalrm_seen = FALSE;
3650 transport_write_timeout = ob->data_timeout;
3651 smtp_command = US"sending data block"; /* For error messages */
3652 DEBUG(D_transport|D_v)
3653 if (sx.peer_offered & OPTION_CHUNKING)
3654 debug_printf(" will write message using CHUNKING\n");
3656 debug_printf(" SMTP>> writing message and terminating \".\"\n");
3657 transport_count = 0;
3659 #ifndef DISABLE_DKIM
3660 dkim_exim_sign_init();
3661 # ifdef EXPERIMENTAL_ARC
3663 uschar * s = ob->arc_sign;
3666 if (!(ob->dkim.arc_signspec = s = expand_string(s)))
3668 if (!f.expand_string_forcedfail)
3670 message = US"failed to expand arc_sign";
3677 /* Ask dkim code to hash the body for ARC */
3678 (void) arc_ams_setup_sign_bodyhash();
3679 ob->dkim.force_bodyhash = TRUE;
3684 sx.ok = dkim_transport_write_message(&tctx, &ob->dkim, CUSS &message);
3686 sx.ok = transport_write_message(&tctx, 0);
3689 /* transport_write_message() uses write() because it is called from other
3690 places to write to non-sockets. This means that under some OS (e.g. Solaris)
3691 it can exit with "Broken pipe" as its error. This really means that the
3692 socket got closed at the far end. */
3694 transport_write_timeout = 0; /* for subsequent transports */
3696 /* Failure can either be some kind of I/O disaster (including timeout),
3697 or the failure of a transport filter or the expansion of added headers.
3698 Or, when CHUNKING, it can be a protocol-detected failure. */
3701 if (message) goto SEND_FAILED;
3702 else goto RESPONSE_FAILED;
3704 /* We used to send the terminating "." explicitly here, but because of
3705 buffering effects at both ends of TCP/IP connections, you don't gain
3706 anything by keeping it separate, so it might as well go in the final
3707 data buffer for efficiency. This is now done by setting the topt_end_dot
3710 smtp_command = US"end of data";
3712 if (sx.peer_offered & OPTION_CHUNKING && sx.cmd_count > 1)
3714 /* Reap any outstanding MAIL & RCPT commands, but not a DATA-go-ahead */
3715 switch(sync_responses(&sx, sx.cmd_count-1, 0))
3717 case 3: sx.ok = TRUE; /* 2xx & 5xx => OK & progress made */
3718 case 2: sx.completed_addr = TRUE; /* 5xx (only) => progress made */
3721 case 1: sx.ok = TRUE; /* 2xx (only) => OK, but if LMTP, */
3722 if (!sx.lmtp) sx.completed_addr = TRUE; /* can't tell about progress yet */
3723 case 0: break; /* No 2xx or 5xx, but no probs */
3725 case -1: goto END_OFF; /* Timeout on RCPT */
3727 #ifdef EXPERIMENTAL_PIPE_CONNECT
3728 case -5: /* TLS first-read error */
3729 case -4: HDEBUG(D_transport)
3730 debug_printf("failed reaping pipelined cmd responses\n");
3732 default: goto RESPONSE_FAILED; /* I/O error, or any MAIL/DATA error */
3736 #ifndef DISABLE_PRDR
3737 /* For PRDR we optionally get a partial-responses warning followed by the
3738 individual responses, before going on with the overall response. If we don't
3739 get the warning then deal with per non-PRDR. */
3743 sx.ok = smtp_read_response(&sx, sx.buffer, sizeof(sx.buffer), '3', ob->final_timeout);
3744 if (!sx.ok && errno == 0) switch(sx.buffer[0])
3746 case '2': sx.prdr_active = FALSE;
3749 case '4': errno = ERRNO_DATA4XX;
3750 addrlist->more_errno |=
3751 ((sx.buffer[1] - '0')*10 + sx.buffer[2] - '0') << 8;
3758 /* For non-PRDR SMTP, we now read a single response that applies to the
3759 whole message. If it is OK, then all the addresses have been delivered. */
3763 sx.ok = smtp_read_response(&sx, sx.buffer, sizeof(sx.buffer), '2',
3765 if (!sx.ok && errno == 0 && sx.buffer[0] == '4')
3767 errno = ERRNO_DATA4XX;
3768 addrlist->more_errno |= ((sx.buffer[1] - '0')*10 + sx.buffer[2] - '0') << 8;
3772 /* For LMTP, we get back a response for every RCPT command that we sent;
3773 some may be accepted and some rejected. For those that get a response, their
3774 status is fixed; any that are accepted have been handed over, even if later
3775 responses crash - at least, that's how I read RFC 2033.
3777 If all went well, mark the recipient addresses as completed, record which
3778 host/IPaddress they were delivered to, and cut out RSET when sending another
3779 message down the same channel. Write the completed addresses to the journal
3780 now so that they are recorded in case there is a crash of hardware or
3781 software before the spool gets updated. Also record the final SMTP
3782 confirmation if needed (for SMTP only). */
3787 struct timeval delivery_time;
3789 uschar * conf = NULL;
3791 timesince(&delivery_time, &start_delivery_time);
3792 sx.send_rset = FALSE;
3793 pipelining_active = FALSE;
3795 /* Set up confirmation if needed - applies only to SMTP */
3798 #ifdef DISABLE_EVENT
3799 LOGGING(smtp_confirmation) &&
3804 const uschar *s = string_printing(sx.buffer);
3805 /* deconst cast ok here as string_printing was checked to have alloc'n'copied */
3806 conf = (s == sx.buffer)? US string_copy(s) : US s;
3809 /* Process all transported addresses - for LMTP or PRDR, read a status for
3812 for (address_item * addr = addrlist; addr != sx.first_addr; addr = addr->next)
3814 if (addr->transport_return != PENDING_OK) continue;
3816 /* LMTP - if the response fails badly (e.g. timeout), use it for all the
3817 remaining addresses. Otherwise, it's a return code for just the one
3818 address. For temporary errors, add a retry item for the address so that
3819 it doesn't get tried again too soon. */
3821 #ifndef DISABLE_PRDR
3822 if (sx.lmtp || sx.prdr_active)
3827 if (!smtp_read_response(&sx, sx.buffer, sizeof(sx.buffer), '2',
3830 if (errno != 0 || sx.buffer[0] == 0) goto RESPONSE_FAILED;
3831 addr->message = string_sprintf(
3832 #ifndef DISABLE_PRDR
3833 "%s error after %s: %s", sx.prdr_active ? "PRDR":"LMTP",
3835 "LMTP error after %s: %s",
3837 data_command, string_printing(sx.buffer));
3838 setflag(addr, af_pass_message); /* Allow message to go to user */
3839 if (sx.buffer[0] == '5')
3840 addr->transport_return = FAIL;
3843 errno = ERRNO_DATA4XX;
3844 addr->more_errno |= ((sx.buffer[1] - '0')*10 + sx.buffer[2] - '0') << 8;
3845 addr->transport_return = DEFER;
3846 #ifndef DISABLE_PRDR
3847 if (!sx.prdr_active)
3849 retry_add_item(addr, addr->address_retry_key, 0);
3853 sx.completed_addr = TRUE; /* NOW we can set this flag */
3854 if (LOGGING(smtp_confirmation))
3856 const uschar *s = string_printing(sx.buffer);
3857 /* deconst cast ok here as string_printing was checked to have alloc'n'copied */
3858 conf = (s == sx.buffer) ? US string_copy(s) : US s;
3862 /* SMTP, or success return from LMTP for this address. Pass back the
3863 actual host that was used. */
3865 addr->transport_return = OK;
3866 addr->more_errno = delivery_time.tv_sec;
3867 addr->delivery_usec = delivery_time.tv_usec;
3868 addr->host_used = host;
3869 addr->special_action = flag;
3870 addr->message = conf;
3872 if (tcp_out_fastopen)
3874 setflag(addr, af_tcp_fastopen_conn);
3875 if (tcp_out_fastopen >= TFO_USED_NODATA) setflag(addr, af_tcp_fastopen);
3876 if (tcp_out_fastopen >= TFO_USED_DATA) setflag(addr, af_tcp_fastopen_data);
3878 if (sx.pipelining_used) setflag(addr, af_pipelining);
3879 #ifdef EXPERIMENTAL_PIPE_CONNECT
3880 if (sx.early_pipe_active) setflag(addr, af_early_pipe);
3882 #ifndef DISABLE_PRDR
3883 if (sx.prdr_active) setflag(addr, af_prdr_used);
3885 if (sx.peer_offered & OPTION_CHUNKING) setflag(addr, af_chunking_used);
3888 #ifndef DISABLE_PRDR
3889 if (!sx.prdr_active)
3892 /* Update the journal. For homonymic addresses, use the base address plus
3893 the transport name. See lots of comments in deliver.c about the reasons
3894 for the complications when homonyms are involved. Just carry on after
3895 write error, as it may prove possible to update the spool file later. */
3897 if (testflag(addr, af_homonym))
3898 sprintf(CS sx.buffer, "%.500s/%s\n", addr->unique + 3, tblock->name);
3900 sprintf(CS sx.buffer, "%.500s\n", addr->unique);
3902 DEBUG(D_deliver) debug_printf("S:journalling %s\n", sx.buffer);
3903 len = Ustrlen(CS sx.buffer);
3904 if (write(journal_fd, sx.buffer, len) != len)
3905 log_write(0, LOG_MAIN|LOG_PANIC, "failed to write journal for "
3906 "%s: %s", sx.buffer, strerror(errno));
3910 #ifndef DISABLE_PRDR
3913 const uschar * overall_message;
3915 /* PRDR - get the final, overall response. For any non-success
3916 upgrade all the address statuses. */
3918 sx.ok = smtp_read_response(&sx, sx.buffer, sizeof(sx.buffer), '2',
3922 if(errno == 0 && sx.buffer[0] == '4')
3924 errno = ERRNO_DATA4XX;
3925 addrlist->more_errno |= ((sx.buffer[1] - '0')*10 + sx.buffer[2] - '0') << 8;
3927 for (address_item * addr = addrlist; addr != sx.first_addr; addr = addr->next)
3928 if (sx.buffer[0] == '5' || addr->transport_return == OK)
3929 addr->transport_return = PENDING_OK; /* allow set_errno action */
3930 goto RESPONSE_FAILED;
3933 /* Append the overall response to the individual PRDR response for logging
3934 and update the journal, or setup retry. */
3936 overall_message = string_printing(sx.buffer);
3937 for (address_item * addr = addrlist; addr != sx.first_addr; addr = addr->next)
3938 if (addr->transport_return == OK)
3939 addr->message = string_sprintf("%s\\n%s", addr->message, overall_message);
3941 for (address_item * addr = addrlist; addr != sx.first_addr; addr = addr->next)
3942 if (addr->transport_return == OK)
3944 if (testflag(addr, af_homonym))
3945 sprintf(CS sx.buffer, "%.500s/%s\n", addr->unique + 3, tblock->name);
3947 sprintf(CS sx.buffer, "%.500s\n", addr->unique);
3949 DEBUG(D_deliver) debug_printf("journalling(PRDR) %s\n", sx.buffer);
3950 len = Ustrlen(CS sx.buffer);
3951 if (write(journal_fd, sx.buffer, len) != len)
3952 log_write(0, LOG_MAIN|LOG_PANIC, "failed to write journal for "
3953 "%s: %s", sx.buffer, strerror(errno));
3955 else if (addr->transport_return == DEFER)
3956 retry_add_item(addr, addr->address_retry_key, -2);
3960 /* Ensure the journal file is pushed out to disk. */
3962 if (EXIMfsync(journal_fd) < 0)
3963 log_write(0, LOG_MAIN|LOG_PANIC, "failed to fsync journal: %s",
3969 /* Handle general (not specific to one address) failures here. The value of ok
3970 is used to skip over this code on the falling through case. A timeout causes a
3971 deferral. Other errors may defer or fail according to the response code, and
3972 may set up a special errno value, e.g. after connection chopped, which is
3973 assumed if errno == 0 and there is no text in the buffer. If control reaches
3974 here during the setting up phase (i.e. before MAIL FROM) then always defer, as
3975 the problem is not related to this specific message. */
3980 uschar * set_message;
3986 sx.send_quit = check_response(host, &save_errno, addrlist->more_errno,
3987 sx.buffer, &code, &message, &pass_message);
3995 message = string_sprintf("send() to %s [%s] failed: %s",
3996 host->name, host->address, message ? message : US strerror(save_errno));
3997 sx.send_quit = FALSE;
4005 sx.ok = FALSE; /* For when reached by GOTO */
4006 set_message = message;
4008 /* We want to handle timeouts after MAIL or "." and loss of connection after
4009 "." specially. They can indicate a problem with the sender address or with
4010 the contents of the message rather than a real error on the connection. These
4011 cases are treated in the same way as a 4xx response. This next bit of code
4012 does the classification. */
4019 message_error = TRUE;
4023 message_error = Ustrncmp(smtp_command,"MAIL",4) == 0 ||
4024 Ustrncmp(smtp_command,"end ",4) == 0;
4027 case ERRNO_SMTPCLOSED:
4028 message_error = Ustrncmp(smtp_command,"end ",4) == 0;
4032 message_error = FALSE;
4036 /* Handle the cases that are treated as message errors. These are:
4038 (a) negative response or timeout after MAIL
4039 (b) negative response after DATA
4040 (c) negative response or timeout or dropped connection after "."
4041 (d) utf8 support required and not offered
4043 It won't be a negative response or timeout after RCPT, as that is dealt
4044 with separately above. The action in all cases is to set an appropriate
4045 error code for all the addresses, but to leave yield set to OK because the
4046 host itself has not failed. Of course, it might in practice have failed
4047 when we've had a timeout, but if so, we'll discover that at the next
4048 delivery attempt. For a temporary error, set the message_defer flag, and
4049 write to the logs for information if this is not the last host. The error
4050 for the last host will be logged as part of the address's log line. */
4054 if (mua_wrapper) code = '5'; /* Force hard failure in wrapper mode */
4056 /* If there's an errno, the message contains just the identity of
4061 else /* Anything other than 5 is treated as temporary */
4065 message = US string_sprintf("%s: %s", message, strerror(save_errno));
4067 write_logs(host, message, sx.first_addr ? sx.first_addr->basic_errno : 0);
4069 *message_defer = TRUE;
4073 /* Otherwise, we have an I/O error or a timeout other than after MAIL or
4074 ".", or some other transportation error. We defer all addresses and yield
4075 DEFER, except for the case of failed add_headers expansion, or a transport
4076 filter failure, when the yield should be ERROR, to stop it trying other
4081 #ifdef EXPERIMENTAL_PIPE_CONNECT
4082 /* If we were early-pipelinng and the actual EHLO response did not match
4083 the cached value we assumed, we could have detected it and passed a
4084 custom errno through to here. It would be nice to RSET and retry right
4085 away, but to reliably do that we eould need an extra synch point before
4086 we committed to data and that would discard half the gained roundrips.
4087 Or we could summarily drop the TCP connection. but that is also ugly.
4088 Instead, we ignore the possibility (having freshened the cache) and rely
4089 on the server telling us with a nonmessage error if we have tried to
4090 do something it no longer supports. */
4093 yield = (save_errno == ERRNO_CHHEADER_FAIL ||
4094 save_errno == ERRNO_FILTER_FAIL) ? ERROR : DEFER;
4098 set_errno(addrlist, save_errno, set_message, set_rc, pass_message, host
4099 #ifdef EXPERIMENTAL_DSN_INFO
4100 , sx.smtp_greeting, sx.helo_response
4106 /* If all has gone well, send_quit will be set TRUE, implying we can end the
4107 SMTP session tidily. However, if there were too many addresses to send in one
4108 message (indicated by first_addr being non-NULL) we want to carry on with the
4109 rest of them. Also, it is desirable to send more than one message down the SMTP
4110 connection if there are several waiting, provided we haven't already sent so
4111 many as to hit the configured limit. The function transport_check_waiting looks
4112 for a waiting message and returns its id. Then transport_pass_socket tries to
4113 set up a continued delivery by passing the socket on to another process. The
4114 variable send_rset is FALSE if a message has just been successfully transferred.
4116 If we are already sending down a continued channel, there may be further
4117 addresses not yet delivered that are aimed at the same host, but which have not
4118 been passed in this run of the transport. In this case, continue_more will be
4119 true, and all we should do is send RSET if necessary, and return, leaving the
4122 However, if no address was disposed of, i.e. all addresses got 4xx errors, we
4123 do not want to continue with other messages down the same channel, because that
4124 can lead to looping between two or more messages, all with the same,
4125 temporarily failing address(es). [The retry information isn't updated yet, so
4126 new processes keep on trying.] We probably also don't want to try more of this
4127 message's addresses either.
4129 If we have started a TLS session, we have to end it before passing the
4130 connection to a new process. However, not all servers can handle this (Exim
4131 can), so we do not pass such a connection on if the host matches
4132 hosts_nopass_tls. */
4135 debug_printf("ok=%d send_quit=%d send_rset=%d continue_more=%d "
4136 "yield=%d first_address is %sNULL\n", sx.ok, sx.send_quit,
4137 sx.send_rset, f.continue_more, yield, sx.first_addr ? "not " : "");
4139 if (sx.completed_addr && sx.ok && sx.send_quit)
4142 smtp_compare_t t_compare;
4144 t_compare.tblock = tblock;
4145 t_compare.current_sender_address = sender_address;
4147 if ( sx.first_addr != NULL
4151 ( tls_out.active.sock < 0 && !continue_proxy_cipher
4152 || verify_check_given_host(CUSS &ob->hosts_nopass_tls, host) != OK
4156 transport_check_waiting(tblock->name, host->name,
4157 tblock->connection_max_messages, new_message_id, &more,
4158 (oicf)smtp_are_same_identities, (void*)&t_compare)
4165 if (! (sx.ok = smtp_write_command(&sx, SCMD_FLUSH, "RSET\r\n") >= 0))
4167 msg = US string_sprintf("send() to %s [%s] failed: %s", host->name,
4168 host->address, strerror(errno));
4169 sx.send_quit = FALSE;
4171 else if (! (sx.ok = smtp_read_response(&sx, sx.buffer, sizeof(sx.buffer),
4172 '2', ob->command_timeout)))
4175 sx.send_quit = check_response(host, &errno, 0, sx.buffer, &code, &msg,
4179 DEBUG(D_transport) debug_printf("H=%s [%s] %s\n",
4180 host->name, host->address, msg);
4184 /* Either RSET was not needed, or it succeeded */
4191 int socket_fd = sx.cctx.sock;
4194 if (sx.first_addr != NULL) /* More addresses still to be sent */
4195 { /* in this run of the transport */
4196 continue_sequence++; /* Causes * in logging */
4200 /* Unless caller said it already has more messages listed for this host,
4201 pass the connection on to a new Exim process (below, the call to
4202 transport_pass_socket). If the caller has more ready, just return with
4203 the connection still open. */
4206 if (tls_out.active.sock >= 0)
4207 if ( f.continue_more
4208 || verify_check_given_host(CUSS &ob->hosts_noproxy_tls, host) == OK)
4210 /* Before passing the socket on, or returning to caller with it still
4211 open, we must shut down TLS. Not all MTAs allow for the continuation
4212 of the SMTP session when TLS is shut down. We test for this by sending
4213 a new EHLO. If we don't get a good response, we don't attempt to pass
4216 tls_close(sx.cctx.tls_ctx, TLS_SHUTDOWN_WAIT);
4217 sx.cctx.tls_ctx = NULL;
4218 smtp_peer_options = smtp_peer_options_wrap;
4220 && smtp_write_command(&sx, SCMD_FLUSH, "EHLO %s\r\n", sx.helo_data)
4222 && smtp_read_response(&sx, sx.buffer, sizeof(sx.buffer),
4223 '2', ob->command_timeout);
4225 if (sx.ok && f.continue_more)
4226 return yield; /* More addresses for another run */
4230 /* Set up a pipe for proxying TLS for the new transport process */
4232 smtp_peer_options |= OPTION_TLS;
4233 if (sx.ok = (socketpair(AF_UNIX, SOCK_STREAM, 0, pfd) == 0))
4236 set_errno(sx.first_addr, errno, US"internal allocation problem",
4238 # ifdef EXPERIMENTAL_DSN_INFO
4239 , sx.smtp_greeting, sx.helo_response
4245 if (f.continue_more)
4246 return yield; /* More addresses for another run */
4248 /* If the socket is successfully passed, we mustn't send QUIT (or
4249 indeed anything!) from here. */
4251 /*XXX DSN_INFO: assume likely to do new HELO; but for greet we'll want to
4252 propagate it from the initial
4254 if (sx.ok && transport_pass_socket(tblock->name, host->name,
4255 host->address, new_message_id, socket_fd))
4257 sx.send_quit = FALSE;
4259 /* We have passed the client socket to a fresh transport process.
4260 If TLS is still active, we need to proxy it for the transport we
4261 just passed the baton to. Fork a child to to do it, and return to
4262 get logging done asap. Which way to place the work makes assumptions
4263 about post-fork prioritisation which may not hold on all platforms. */
4265 if (tls_out.active.sock >= 0)
4268 if (pid == 0) /* child; fork again to disconnect totally */
4270 if (f.running_in_test_harness) millisleep(100); /* let parent debug out */
4271 /* does not return */
4272 smtp_proxy_tls(sx.cctx.tls_ctx, sx.buffer, sizeof(sx.buffer), pfd,
4273 ob->command_timeout);
4276 if (pid > 0) /* parent */
4278 DEBUG(D_transport) debug_printf("proxy-proc inter-pid %d\n", pid);
4280 /* tidy the inter-proc to disconn the proxy proc */
4281 waitpid(pid, NULL, 0);
4282 tls_close(sx.cctx.tls_ctx, TLS_NO_SHUTDOWN);
4283 sx.cctx.tls_ctx = NULL;
4284 (void)close(sx.cctx.sock);
4286 continue_transport = NULL;
4287 continue_hostname = NULL;
4290 log_write(0, LOG_PANIC_DIE, "fork failed");
4296 /* If RSET failed and there are addresses left, they get deferred. */
4298 set_errno(sx.first_addr, errno, msg, DEFER, FALSE, host
4299 #ifdef EXPERIMENTAL_DSN_INFO
4300 , sx.smtp_greeting, sx.helo_response
4306 /* End off tidily with QUIT unless the connection has died or the socket has
4307 been passed to another process. There has been discussion on the net about what
4308 to do after sending QUIT. The wording of the RFC suggests that it is necessary
4309 to wait for a response, but on the other hand, there isn't anything one can do
4310 with an error response, other than log it. Exim used to do that. However,
4311 further discussion suggested that it is positively advantageous not to wait for
4312 the response, but to close the session immediately. This is supposed to move
4313 the TCP/IP TIME_WAIT state from the server to the client, thereby removing some
4314 load from the server. (Hosts that are both servers and clients may not see much
4315 difference, of course.) Further discussion indicated that this was safe to do
4316 on Unix systems which have decent implementations of TCP/IP that leave the
4317 connection around for a while (TIME_WAIT) after the application has gone away.
4318 This enables the response sent by the server to be properly ACKed rather than
4319 timed out, as can happen on broken TCP/IP implementations on other OS.
4321 This change is being made on 31-Jul-98. After over a year of trouble-free
4322 operation, the old commented-out code was removed on 17-Sep-99. */
4326 (void) setsockopt(sx.cctx.sock, IPPROTO_TCP, TCP_CORK, US &on, sizeof(on));
4328 if (sx.send_quit) (void)smtp_write_command(&sx, SCMD_FLUSH, "QUIT\r\n");
4333 tls_close(sx.cctx.tls_ctx, TLS_SHUTDOWN_NOWAIT);
4334 sx.cctx.tls_ctx = NULL;
4337 /* Close the socket, and return the appropriate value, first setting
4338 works because the NULL setting is passed back to the calling process, and
4339 remote_max_parallel is forced to 1 when delivering over an existing connection,
4341 If all went well and continue_more is set, we shouldn't actually get here if
4342 there are further addresses, as the return above will be taken. However,
4343 writing RSET might have failed, or there may be other addresses whose hosts are
4344 specified in the transports, and therefore not visible at top level, in which
4345 case continue_more won't get set. */
4347 HDEBUG(D_transport|D_acl|D_v) debug_printf_indent(" SMTP(close)>>\n");
4350 shutdown(sx.cctx.sock, SHUT_WR);
4351 millisleep(f.running_in_test_harness ? 200 : 20);
4352 if (fcntl(sx.cctx.sock, F_SETFL, O_NONBLOCK) == 0)
4353 for (int i = 16; read(sx.cctx.sock, sx.inbuffer, sizeof(sx.inbuffer)) > 0 && i > 0;)
4354 i--; /* drain socket */
4356 (void)close(sx.cctx.sock);
4358 #ifndef DISABLE_EVENT
4359 (void) event_raise(tblock->event_action, US"tcp:close", NULL);
4362 continue_transport = NULL;
4363 continue_hostname = NULL;
4370 /*************************************************
4371 * Closedown entry point *
4372 *************************************************/
4374 /* This function is called when exim is passed an open smtp channel
4375 from another incarnation, but the message which it has been asked
4376 to deliver no longer exists. The channel is on stdin.
4378 We might do fancy things like looking for another message to send down
4379 the channel, but if the one we sought has gone, it has probably been
4380 delivered by some other process that itself will seek further messages,
4381 so just close down our connection.
4383 Argument: pointer to the transport instance block
4388 smtp_transport_closedown(transport_instance *tblock)
4390 smtp_transport_options_block * ob = SOB tblock->options_block;
4391 client_conn_ctx cctx;
4394 uschar inbuffer[4096];
4395 uschar outbuffer[16];
4397 /*XXX really we need an active-smtp-client ctx, rather than assuming stdout */
4398 cctx.sock = fileno(stdin);
4399 cctx.tls_ctx = cctx.sock == tls_out.active.sock ? tls_out.active.tls_ctx : NULL;
4401 sx.inblock.cctx = &cctx;
4402 sx.inblock.buffer = inbuffer;
4403 sx.inblock.buffersize = sizeof(inbuffer);
4404 sx.inblock.ptr = inbuffer;
4405 sx.inblock.ptrend = inbuffer;
4407 sx.outblock.cctx = &cctx;
4408 sx.outblock.buffersize = sizeof(outbuffer);
4409 sx.outblock.buffer = outbuffer;
4410 sx.outblock.ptr = outbuffer;
4411 sx.outblock.cmd_count = 0;
4412 sx.outblock.authenticating = FALSE;
4414 (void)smtp_write_command(&sx, SCMD_FLUSH, "QUIT\r\n");
4415 (void)smtp_read_response(&sx, buffer, sizeof(buffer), '2', ob->command_timeout);
4416 (void)close(cctx.sock);
4421 /*************************************************
4422 * Prepare addresses for delivery *
4423 *************************************************/
4425 /* This function is called to flush out error settings from previous delivery
4426 attempts to other hosts. It also records whether we got here via an MX record
4427 or not in the more_errno field of the address. We are interested only in
4428 addresses that are still marked DEFER - others may have got delivered to a
4429 previously considered IP address. Set their status to PENDING_DEFER to indicate
4430 which ones are relevant this time.
4433 addrlist the list of addresses
4434 host the host we are delivering to
4436 Returns: the first address for this delivery
4439 static address_item *
4440 prepare_addresses(address_item *addrlist, host_item *host)
4442 address_item *first_addr = NULL;
4443 for (address_item * addr = addrlist; addr; addr = addr->next)
4444 if (addr->transport_return == DEFER)
4446 if (!first_addr) first_addr = addr;
4447 addr->transport_return = PENDING_DEFER;
4448 addr->basic_errno = 0;
4449 addr->more_errno = (host->mx >= 0)? 'M' : 'A';
4450 addr->message = NULL;
4452 addr->cipher = NULL;
4453 addr->ourcert = NULL;
4454 addr->peercert = NULL;
4455 addr->peerdn = NULL;
4456 addr->ocsp = OCSP_NOT_REQ;
4458 #ifdef EXPERIMENTAL_DSN_INFO
4459 addr->smtp_greeting = NULL;
4460 addr->helo_response = NULL;
4468 /*************************************************
4469 * Main entry point *
4470 *************************************************/
4472 /* See local README for interface details. As this is a remote transport, it is
4473 given a chain of addresses to be delivered in one connection, if possible. It
4474 always returns TRUE, indicating that each address has its own independent
4475 status set, except if there is a setting up problem, in which case it returns
4479 smtp_transport_entry(
4480 transport_instance *tblock, /* data for this instantiation */
4481 address_item *addrlist) /* addresses we are working on */
4484 int hosts_defer = 0;
4486 int hosts_looked_up = 0;
4487 int hosts_retry = 0;
4488 int hosts_serial = 0;
4489 int hosts_total = 0;
4490 int total_hosts_tried = 0;
4491 BOOL expired = TRUE;
4492 uschar *expanded_hosts = NULL;
4494 uschar *tid = string_sprintf("%s transport", tblock->name);
4495 smtp_transport_options_block *ob = SOB tblock->options_block;
4496 host_item *hostlist = addrlist->host_list;
4497 host_item *host = NULL;
4501 debug_printf("%s transport entered\n", tblock->name);
4502 for (address_item * addr = addrlist; addr; addr = addr->next)
4503 debug_printf(" %s\n", addr->address);
4506 debug_printf("hostlist:\n");
4507 for (host_item * host = hostlist; host; host = host->next)
4508 debug_printf(" '%s' IP %s port %d\n", host->name, host->address, host->port);
4510 if (continue_hostname)
4511 debug_printf("already connected to %s [%s] (on fd %d)\n",
4512 continue_hostname, continue_host_address,
4513 cutthrough.cctx.sock >= 0 ? cutthrough.cctx.sock : 0);
4516 /* Set the flag requesting that these hosts be added to the waiting
4517 database if the delivery fails temporarily or if we are running with
4518 queue_smtp or a 2-stage queue run. This gets unset for certain
4519 kinds of error, typically those that are specific to the message. */
4521 update_waiting = TRUE;
4523 /* If a host list is not defined for the addresses - they must all have the
4524 same one in order to be passed to a single transport - or if the transport has
4525 a host list with hosts_override set, use the host list supplied with the
4526 transport. It is an error for this not to exist. */
4528 if (!hostlist || (ob->hosts_override && ob->hosts))
4532 addrlist->message = string_sprintf("%s transport called with no hosts set",
4534 addrlist->transport_return = PANIC;
4535 return FALSE; /* Only top address has status */
4538 DEBUG(D_transport) debug_printf("using the transport's hosts: %s\n",
4541 /* If the transport's host list contains no '$' characters, and we are not
4542 randomizing, it is fixed and therefore a chain of hosts can be built once
4543 and for all, and remembered for subsequent use by other calls to this
4544 transport. If, on the other hand, the host list does contain '$', or we are
4545 randomizing its order, we have to rebuild it each time. In the fixed case,
4546 as the hosts string will never be used again, it doesn't matter that we
4547 replace all the : characters with zeros. */
4551 uschar *s = ob->hosts;
4553 if (Ustrchr(s, '$') != NULL)
4555 if (!(expanded_hosts = expand_string(s)))
4557 addrlist->message = string_sprintf("failed to expand list of hosts "
4558 "\"%s\" in %s transport: %s", s, tblock->name, expand_string_message);
4559 addrlist->transport_return = f.search_find_defer ? DEFER : PANIC;
4560 return FALSE; /* Only top address has status */
4562 DEBUG(D_transport) debug_printf("expanded list of hosts \"%s\" to "
4563 "\"%s\"\n", s, expanded_hosts);
4567 if (ob->hosts_randomize) s = expanded_hosts = string_copy(s);
4569 host_build_hostlist(&hostlist, s, ob->hosts_randomize);
4571 /* Check that the expansion yielded something useful. */
4575 string_sprintf("%s transport has empty hosts setting", tblock->name);
4576 addrlist->transport_return = PANIC;
4577 return FALSE; /* Only top address has status */
4580 /* If there was no expansion of hosts, save the host list for
4583 if (!expanded_hosts) ob->hostlist = hostlist;
4586 /* This is not the first time this transport has been run in this delivery;
4587 the host list was built previously. */
4590 hostlist = ob->hostlist;
4593 /* The host list was supplied with the address. If hosts_randomize is set, we
4594 must sort it into a random order if it did not come from MX records and has not
4595 already been randomized (but don't bother if continuing down an existing
4598 else if (ob->hosts_randomize && hostlist->mx == MX_NONE && !continue_hostname)
4600 host_item *newlist = NULL;
4603 host_item *h = hostlist;
4604 hostlist = hostlist->next;
4606 h->sort_key = random_number(100);
4613 else if (h->sort_key < newlist->sort_key)
4620 host_item *hh = newlist;
4623 if (h->sort_key < hh->next->sort_key) break;
4631 hostlist = addrlist->host_list = newlist;
4634 /* Sort out the default port. */
4636 if (!smtp_get_port(ob->port, addrlist, &defport, tid)) return FALSE;
4638 /* For each host-plus-IP-address on the list:
4640 . If this is a continued delivery and the host isn't the one with the
4641 current connection, skip.
4643 . If the status is unusable (i.e. previously failed or retry checked), skip.
4645 . If no IP address set, get the address, either by turning the name into
4646 an address, calling gethostbyname if gethostbyname is on, or by calling
4647 the DNS. The DNS may yield multiple addresses, in which case insert the
4648 extra ones into the list.
4650 . Get the retry data if not previously obtained for this address and set the
4651 field which remembers the state of this address. Skip if the retry time is
4652 not reached. If not, remember whether retry data was found. The retry string
4653 contains both the name and the IP address.
4655 . Scan the list of addresses and mark those whose status is DEFER as
4656 PENDING_DEFER. These are the only ones that will be processed in this cycle
4659 . Make a delivery attempt - addresses marked PENDING_DEFER will be tried.
4660 Some addresses may be successfully delivered, others may fail, and yet
4661 others may get temporary errors and so get marked DEFER.
4663 . The return from the delivery attempt is OK if a connection was made and a
4664 valid SMTP dialogue was completed. Otherwise it is DEFER.
4666 . If OK, add a "remove" retry item for this host/IPaddress, if any.
4668 . If fail to connect, or other defer state, add a retry item.
4670 . If there are any addresses whose status is still DEFER, carry on to the
4671 next host/IPaddress, unless we have tried the number of hosts given
4672 by hosts_max_try or hosts_max_try_hardlimit; otherwise return. Note that
4673 there is some fancy logic for hosts_max_try that means its limit can be
4674 overstepped in some circumstances.
4676 If we get to the end of the list, all hosts have deferred at least one address,
4677 or not reached their retry times. If delay_after_cutoff is unset, it requests a
4678 delivery attempt to those hosts whose last try was before the arrival time of
4679 the current message. To cope with this, we have to go round the loop a second
4680 time. After that, set the status and error data for any addresses that haven't
4681 had it set already. */
4683 for (int cutoff_retry = 0;
4684 expired && cutoff_retry < (ob->delay_after_cutoff ? 1 : 2);
4687 host_item *nexthost = NULL;
4688 int unexpired_hosts_tried = 0;
4689 BOOL continue_host_tried = FALSE;
4691 retry_non_continued:
4692 for (host = hostlist;
4694 && unexpired_hosts_tried < ob->hosts_max_try
4695 && total_hosts_tried < ob->hosts_max_try_hardlimit;
4700 BOOL host_is_expired = FALSE;
4701 BOOL message_defer = FALSE;
4702 BOOL some_deferred = FALSE;
4703 address_item *first_addr = NULL;
4704 uschar *interface = NULL;
4705 uschar *retry_host_key = NULL;
4706 uschar *retry_message_key = NULL;
4707 uschar *serialize_key = NULL;
4709 /* Default next host is next host. :-) But this can vary if the
4710 hosts_max_try limit is hit (see below). It may also be reset if a host
4711 address is looked up here (in case the host was multihomed). */
4713 nexthost = host->next;
4715 /* If the address hasn't yet been obtained from the host name, look it up
4716 now, unless the host is already marked as unusable. If it is marked as
4717 unusable, it means that the router was unable to find its IP address (in
4718 the DNS or wherever) OR we are in the 2nd time round the cutoff loop, and
4719 the lookup failed last time. We don't get this far if *all* MX records
4720 point to non-existent hosts; that is treated as a hard error.
4722 We can just skip this host entirely. When the hosts came from the router,
4723 the address will timeout based on the other host(s); when the address is
4724 looked up below, there is an explicit retry record added.
4726 Note that we mustn't skip unusable hosts if the address is not unset; they
4727 may be needed as expired hosts on the 2nd time round the cutoff loop. */
4731 int new_port, flags;
4733 if (host->status >= hstatus_unusable)
4735 DEBUG(D_transport) debug_printf("%s has no address and is unusable - skipping\n",
4740 DEBUG(D_transport) debug_printf("getting address for %s\n", host->name);
4742 /* The host name is permitted to have an attached port. Find it, and
4743 strip it from the name. Just remember it for now. */
4745 new_port = host_item_get_port(host);
4747 /* Count hosts looked up */
4751 /* Find by name if so configured, or if it's an IP address. We don't
4752 just copy the IP address, because we need the test-for-local to happen. */
4754 flags = HOST_FIND_BY_A | HOST_FIND_BY_AAAA;
4755 if (ob->dns_qualify_single) flags |= HOST_FIND_QUALIFY_SINGLE;
4756 if (ob->dns_search_parents) flags |= HOST_FIND_SEARCH_PARENTS;
4758 if (ob->gethostbyname || string_is_ip_address(host->name, NULL) != 0)
4759 rc = host_find_byname(host, NULL, flags, NULL, TRUE);
4761 rc = host_find_bydns(host, NULL, flags, NULL, NULL, NULL,
4762 &ob->dnssec, /* domains for request/require */
4765 /* Update the host (and any additional blocks, resulting from
4766 multihoming) with a host-specific port, if any. */
4768 for (host_item * hh = host; hh != nexthost; hh = hh->next) hh->port = new_port;
4770 /* Failure to find the host at this time (usually DNS temporary failure)
4771 is really a kind of routing failure rather than a transport failure.
4772 Therefore we add a retry item of the routing kind, not to stop us trying
4773 to look this name up here again, but to ensure the address gets timed
4774 out if the failures go on long enough. A complete failure at this point
4775 commonly points to a configuration error, but the best action is still
4776 to carry on for the next host. */
4778 if (rc == HOST_FIND_AGAIN || rc == HOST_FIND_SECURITY || rc == HOST_FIND_FAILED)
4780 retry_add_item(addrlist, string_sprintf("R:%s", host->name), 0);
4782 if (rc == HOST_FIND_AGAIN) hosts_defer++; else hosts_fail++;
4783 DEBUG(D_transport) debug_printf("rc = %s for %s\n", (rc == HOST_FIND_AGAIN)?
4784 "HOST_FIND_AGAIN" : "HOST_FIND_FAILED", host->name);
4785 host->status = hstatus_unusable;
4787 for (address_item * addr = addrlist; addr; addr = addr->next)
4789 if (addr->transport_return != DEFER) continue;
4790 addr->basic_errno = ERRNO_UNKNOWNHOST;
4791 addr->message = string_sprintf(
4792 rc == HOST_FIND_SECURITY
4793 ? "lookup of IP address for %s was insecure"
4794 : "failed to lookup IP address for %s",
4800 /* If the host is actually the local host, we may have a problem, or
4801 there may be some cunning configuration going on. In the problem case,
4802 log things and give up. The default transport status is already DEFER. */
4804 if (rc == HOST_FOUND_LOCAL && !ob->allow_localhost)
4806 for (address_item * addr = addrlist; addr; addr = addr->next)
4808 addr->basic_errno = 0;
4809 addr->message = string_sprintf("%s transport found host %s to be "
4810 "local", tblock->name, host->name);
4814 } /* End of block for IP address lookup */
4816 /* If this is a continued delivery, we are interested only in the host
4817 which matches the name of the existing open channel. The check is put
4818 here after the local host lookup, in case the name gets expanded as a
4819 result of the lookup. Set expired FALSE, to save the outer loop executing
4822 if (continue_hostname)
4823 if ( Ustrcmp(continue_hostname, host->name) != 0
4824 || Ustrcmp(continue_host_address, host->address) != 0
4828 continue; /* With next host */
4831 continue_host_tried = TRUE;
4833 /* Reset the default next host in case a multihomed host whose addresses
4834 are not looked up till just above added to the host list. */
4836 nexthost = host->next;
4838 /* If queue_smtp is set (-odqs or the first part of a 2-stage run), or the
4839 domain is in queue_smtp_domains, we don't actually want to attempt any
4840 deliveries. When doing a queue run, queue_smtp_domains is always unset. If
4841 there is a lookup defer in queue_smtp_domains, proceed as if the domain
4842 were not in it. We don't want to hold up all SMTP deliveries! Except when
4843 doing a two-stage queue run, don't do this if forcing. */
4845 if ((!f.deliver_force || f.queue_2stage) && (f.queue_smtp ||
4846 match_isinlist(addrlist->domain,
4847 (const uschar **)&queue_smtp_domains, 0,
4848 &domainlist_anchor, NULL, MCL_DOMAIN, TRUE, NULL) == OK))
4851 for (address_item * addr = addrlist; addr; addr = addr->next)
4852 if (addr->transport_return == DEFER)
4853 addr->message = US"domain matches queue_smtp_domains, or -odqs set";
4854 continue; /* With next host */
4857 /* Count hosts being considered - purely for an intelligent comment
4858 if none are usable. */
4862 /* Set $host and $host address now in case they are needed for the
4863 interface expansion or the serialize_hosts check; they remain set if an
4864 actual delivery happens. */
4866 deliver_host = host->name;
4867 deliver_host_address = host->address;
4868 lookup_dnssec_authenticated = host->dnssec == DS_YES ? US"yes"
4869 : host->dnssec == DS_NO ? US"no"
4872 /* Set up a string for adding to the retry key if the port number is not
4873 the standard SMTP port. A host may have its own port setting that overrides
4876 pistring = string_sprintf(":%d", host->port == PORT_NONE
4877 ? defport : host->port);
4878 if (Ustrcmp(pistring, ":25") == 0) pistring = US"";
4880 /* Select IPv4 or IPv6, and choose an outgoing interface. If the interface
4881 string is set, even if constant (as different transports can have different
4882 constant settings), we must add it to the key that is used for retries,
4883 because connections to the same host from a different interface should be
4884 treated separately. */
4886 host_af = Ustrchr(host->address, ':') == NULL ? AF_INET : AF_INET6;
4888 uschar * s = ob->interface;
4891 if (!smtp_get_interface(s, host_af, addrlist, &interface, tid))
4893 pistring = string_sprintf("%s/%s", pistring, interface);
4897 /* The first time round the outer loop, check the status of the host by
4898 inspecting the retry data. The second time round, we are interested only
4899 in expired hosts that haven't been tried since this message arrived. */
4901 if (cutoff_retry == 0)
4904 /* Ensure the status of the address is set by checking retry data if
4905 necessary. There may be host-specific retry data (applicable to all
4906 messages) and also data for retries of a specific message at this host.
4907 If either of these retry records are actually read, the keys used are
4908 returned to save recomputing them later. */
4910 if (exp_bool(addrlist, US"transport", tblock->name, D_transport,
4911 US"retry_include_ip_address", ob->retry_include_ip_address,
4912 ob->expand_retry_include_ip_address, &incl_ip) != OK)
4913 continue; /* with next host */
4915 host_is_expired = retry_check_address(addrlist->domain, host, pistring,
4916 incl_ip, &retry_host_key, &retry_message_key);
4918 DEBUG(D_transport) debug_printf("%s [%s]%s retry-status = %s\n", host->name,
4919 host->address ? host->address : US"", pistring,
4920 host->status == hstatus_usable ? "usable"
4921 : host->status == hstatus_unusable ? "unusable"
4922 : host->status == hstatus_unusable_expired ? "unusable (expired)" : "?");
4924 /* Skip this address if not usable at this time, noting if it wasn't
4925 actually expired, both locally and in the address. */
4927 switch (host->status)
4929 case hstatus_unusable:
4931 setflag(addrlist, af_retry_skipped);
4934 case hstatus_unusable_expired:
4937 case hwhy_retry: hosts_retry++; break;
4938 case hwhy_failed: hosts_fail++; break;
4940 case hwhy_deferred: hosts_defer++; break;
4943 /* If there was a retry message key, implying that previously there
4944 was a message-specific defer, we don't want to update the list of
4945 messages waiting for these hosts. */
4947 if (retry_message_key) update_waiting = FALSE;
4948 continue; /* With the next host or IP address */
4952 /* Second time round the loop: if the address is set but expired, and
4953 the message is newer than the last try, let it through. */
4958 || host->status != hstatus_unusable_expired
4959 || host->last_try > received_time.tv_sec)
4961 DEBUG(D_transport) debug_printf("trying expired host %s [%s]%s\n",
4962 host->name, host->address, pistring);
4963 host_is_expired = TRUE;
4966 /* Setting "expired=FALSE" doesn't actually mean not all hosts are expired;
4967 it remains TRUE only if all hosts are expired and none are actually tried.
4972 /* If this host is listed as one to which access must be serialized,
4973 see if another Exim process has a connection to it, and if so, skip
4974 this host. If not, update the database to record our connection to it
4975 and remember this for later deletion. Do not do any of this if we are
4976 sending the message down a pre-existing connection. */
4978 if ( !continue_hostname
4979 && verify_check_given_host(CUSS &ob->serialize_hosts, host) == OK)
4981 serialize_key = string_sprintf("host-serialize-%s", host->name);
4982 if (!enq_start(serialize_key, 1))
4985 debug_printf("skipping host %s because another Exim process "
4986 "is connected to it\n", host->name);
4992 /* OK, we have an IP address that is not waiting for its retry time to
4993 arrive (it might be expired) OR (second time round the loop) we have an
4994 expired host that hasn't been tried since the message arrived. Have a go
4995 at delivering the message to it. First prepare the addresses by flushing
4996 out the result of previous attempts, and finding the first address that
4997 is still to be delivered. */
4999 first_addr = prepare_addresses(addrlist, host);
5001 DEBUG(D_transport) debug_printf("delivering %s to %s [%s] (%s%s)\n",
5002 message_id, host->name, host->address, addrlist->address,
5003 addrlist->next ? ", ..." : "");
5005 set_process_info("delivering %s to %s [%s]%s (%s%s)",
5006 message_id, host->name, host->address, pistring, addrlist->address,
5007 addrlist->next ? ", ..." : "");
5009 /* This is not for real; don't do the delivery. If there are
5010 any remaining hosts, list them. */
5014 set_errno_nohost(addrlist, 0, NULL, OK, FALSE);
5015 for (address_item * addr = addrlist; addr; addr = addr->next)
5017 addr->host_used = host;
5018 addr->special_action = '*';
5019 addr->message = US"delivery bypassed by -N option";
5023 debug_printf("*** delivery by %s transport bypassed by -N option\n"
5024 "*** host and remaining hosts:\n", tblock->name);
5025 for (host_item * host2 = host; host2; host2 = host2->next)
5026 debug_printf(" %s [%s]\n", host2->name,
5027 host2->address ? host2->address : US"unset");
5032 /* This is for real. If the host is expired, we don't count it for
5033 hosts_max_retry. This ensures that all hosts must expire before an address
5034 is timed out, unless hosts_max_try_hardlimit (which protects against
5035 lunatic DNS configurations) is reached.
5037 If the host is not expired and we are about to hit the hosts_max_retry
5038 limit, check to see if there is a subsequent hosts with a different MX
5039 value. If so, make that the next host, and don't count this one. This is a
5040 heuristic to make sure that different MXs do get tried. With a normal kind
5041 of retry rule, they would get tried anyway when the earlier hosts were
5042 delayed, but if the domain has a "retry every time" type of rule - as is
5043 often used for the the very large ISPs, that won't happen. */
5048 /* Make a copy of the host if it is local to this invocation
5049 of the transport. */
5053 thost = store_get(sizeof(host_item));
5055 thost->name = string_copy(host->name);
5056 thost->address = string_copy(host->address);
5061 if (!host_is_expired && ++unexpired_hosts_tried >= ob->hosts_max_try)
5064 debug_printf("hosts_max_try limit reached with this host\n");
5065 for (host_item * h = host; h; h = h->next) if (h->mx != host->mx)
5068 unexpired_hosts_tried--;
5069 DEBUG(D_transport) debug_printf("however, a higher MX host exists "
5070 "and will be tried\n");
5075 /* Attempt the delivery. */
5077 total_hosts_tried++;
5078 rc = smtp_deliver(addrlist, thost, host_af, defport, interface, tblock,
5079 &message_defer, FALSE);
5082 OK => connection made, each address contains its result;
5083 message_defer is set for message-specific defers (when all
5084 recipients are marked defer)
5085 DEFER => there was a non-message-specific delivery problem;
5086 ERROR => there was a problem setting up the arguments for a filter,
5087 or there was a problem with expanding added headers
5090 /* If the result is not OK, there was a non-message-specific problem.
5091 If the result is DEFER, we need to write to the logs saying what happened
5092 for this particular host, except in the case of authentication and TLS
5093 failures, where the log has already been written. If all hosts defer a
5094 general message is written at the end. */
5096 if (rc == DEFER && first_addr->basic_errno != ERRNO_AUTHFAIL
5097 && first_addr->basic_errno != ERRNO_TLSFAILURE)
5098 write_logs(host, first_addr->message, first_addr->basic_errno);
5100 #ifndef DISABLE_EVENT
5102 deferred_event_raise(first_addr, host);
5105 /* If STARTTLS was accepted, but there was a failure in setting up the
5106 TLS session (usually a certificate screwup), and the host is not in
5107 hosts_require_tls, and tls_tempfail_tryclear is true, try again, with
5108 TLS forcibly turned off. We have to start from scratch with a new SMTP
5109 connection. That's why the retry is done from here, not from within
5110 smtp_deliver(). [Rejections of STARTTLS itself don't screw up the
5111 session, so the in-clear transmission after those errors, if permitted,
5112 happens inside smtp_deliver().] */
5116 && first_addr->basic_errno == ERRNO_TLSFAILURE
5117 && ob->tls_tempfail_tryclear
5118 && verify_check_given_host(CUSS &ob->hosts_require_tls, host) != OK
5121 log_write(0, LOG_MAIN,
5122 "%s: delivering unencrypted to H=%s [%s] (not in hosts_require_tls)",
5123 first_addr->message, host->name, host->address);
5124 first_addr = prepare_addresses(addrlist, host);
5125 rc = smtp_deliver(addrlist, thost, host_af, defport, interface, tblock,
5126 &message_defer, TRUE);
5127 if (rc == DEFER && first_addr->basic_errno != ERRNO_AUTHFAIL)
5128 write_logs(host, first_addr->message, first_addr->basic_errno);
5129 # ifndef DISABLE_EVENT
5131 deferred_event_raise(first_addr, host);
5134 #endif /*DISABLE_TLS*/
5137 /* Delivery attempt finished */
5139 set_process_info("delivering %s: just tried %s [%s]%s for %s%s: result %s",
5140 message_id, host->name, host->address, pistring, addrlist->address,
5141 addrlist->next ? " (& others)" : "", rc_to_string(rc));
5143 /* Release serialization if set up */
5145 if (serialize_key) enq_end(serialize_key);
5147 /* If the result is DEFER, or if a host retry record is known to exist, we
5148 need to add an item to the retry chain for updating the retry database
5149 at the end of delivery. We only need to add the item to the top address,
5150 of course. Also, if DEFER, we mark the IP address unusable so as to skip it
5151 for any other delivery attempts using the same address. (It is copied into
5152 the unusable tree at the outer level, so even if different address blocks
5153 contain the same address, it still won't get tried again.) */
5155 if (rc == DEFER || retry_host_key)
5157 int delete_flag = rc != DEFER ? rf_delete : 0;
5158 if (!retry_host_key)
5161 if (exp_bool(addrlist, US"transport", tblock->name, D_transport,
5162 US"retry_include_ip_address", ob->retry_include_ip_address,
5163 ob->expand_retry_include_ip_address, &incl_ip) != OK)
5164 incl_ip = TRUE; /* error; use most-specific retry record */
5166 retry_host_key = incl_ip
5167 ? string_sprintf("T:%S:%s%s", host->name, host->address, pistring)
5168 : string_sprintf("T:%S%s", host->name, pistring);
5171 /* If a delivery of another message over an existing SMTP connection
5172 yields DEFER, we do NOT set up retry data for the host. This covers the
5173 case when there are delays in routing the addresses in the second message
5174 that are so long that the server times out. This is alleviated by not
5175 routing addresses that previously had routing defers when handling an
5176 existing connection, but even so, this case may occur (e.g. if a
5177 previously happily routed address starts giving routing defers). If the
5178 host is genuinely down, another non-continued message delivery will
5179 notice it soon enough. */
5181 if (delete_flag != 0 || !continue_hostname)
5182 retry_add_item(first_addr, retry_host_key, rf_host | delete_flag);
5184 /* We may have tried an expired host, if its retry time has come; ensure
5185 the status reflects the expiry for the benefit of any other addresses. */
5189 host->status = host_is_expired
5190 ? hstatus_unusable_expired : hstatus_unusable;
5191 host->why = hwhy_deferred;
5195 /* If message_defer is set (host was OK, but every recipient got deferred
5196 because of some message-specific problem), or if that had happened
5197 previously so that a message retry key exists, add an appropriate item
5198 to the retry chain. Note that if there was a message defer but now there is
5199 a host defer, the message defer record gets deleted. That seems perfectly
5200 reasonable. Also, stop the message from being remembered as waiting
5201 for specific hosts. */
5203 if (message_defer || retry_message_key)
5205 int delete_flag = message_defer ? 0 : rf_delete;
5206 if (!retry_message_key)
5209 if (exp_bool(addrlist, US"transport", tblock->name, D_transport,
5210 US"retry_include_ip_address", ob->retry_include_ip_address,
5211 ob->expand_retry_include_ip_address, &incl_ip) != OK)
5212 incl_ip = TRUE; /* error; use most-specific retry record */
5214 retry_message_key = incl_ip
5215 ? string_sprintf("T:%S:%s%s:%s", host->name, host->address, pistring,
5217 : string_sprintf("T:%S%s:%s", host->name, pistring, message_id);
5219 retry_add_item(addrlist, retry_message_key,
5220 rf_message | rf_host | delete_flag);
5221 update_waiting = FALSE;
5224 /* Any return other than DEFER (that is, OK or ERROR) means that the
5225 addresses have got their final statuses filled in for this host. In the OK
5226 case, see if any of them are deferred. */
5229 for (address_item * addr = addrlist; addr; addr = addr->next)
5230 if (addr->transport_return == DEFER)
5232 some_deferred = TRUE;
5236 /* If no addresses deferred or the result was ERROR, return. We do this for
5237 ERROR because a failing filter set-up or add_headers expansion is likely to
5238 fail for any host we try. */
5240 if (rc == ERROR || (rc == OK && !some_deferred))
5242 DEBUG(D_transport) debug_printf("Leaving %s transport\n", tblock->name);
5243 return TRUE; /* Each address has its status */
5246 /* If the result was DEFER or some individual addresses deferred, let
5247 the loop run to try other hosts with the deferred addresses, except for the
5248 case when we were trying to deliver down an existing channel and failed.
5249 Don't try any other hosts in this case. */
5251 if (continue_hostname) break;
5253 /* If the whole delivery, or some individual addresses, were deferred and
5254 there are more hosts that could be tried, do not count this host towards
5255 the hosts_max_try limit if the age of the message is greater than the
5256 maximum retry time for this host. This means we may try try all hosts,
5257 ignoring the limit, when messages have been around for some time. This is
5258 important because if we don't try all hosts, the address will never time
5259 out. NOTE: this does not apply to hosts_max_try_hardlimit. */
5261 if ((rc == DEFER || some_deferred) && nexthost)
5264 retry_config *retry = retry_find_config(host->name, NULL, 0, 0);
5266 if (retry && retry->rules)
5268 retry_rule *last_rule;
5269 for (last_rule = retry->rules;
5271 last_rule = last_rule->next);
5272 timedout = time(NULL) - received_time.tv_sec > last_rule->timeout;
5274 else timedout = TRUE; /* No rule => timed out */
5278 unexpired_hosts_tried--;
5279 DEBUG(D_transport) debug_printf("temporary delivery error(s) override "
5280 "hosts_max_try (message older than host's retry time)\n");
5286 if (unexpired_hosts_tried >= ob->hosts_max_try)
5287 debug_printf("reached transport hosts_max_try limit %d\n",
5289 if (total_hosts_tried >= ob->hosts_max_try_hardlimit)
5290 debug_printf("reached transport hosts_max_try_hardlimit limit %d\n",
5291 ob->hosts_max_try_hardlimit);
5294 if (f.running_in_test_harness) millisleep(500); /* let server debug out */
5295 } /* End of loop for trying multiple hosts. */
5297 /* If we failed to find a matching host in the list, for an already-open
5298 connection, just close it and start over with the list. This can happen
5299 for routing that changes from run to run, or big multi-IP sites with
5302 if (continue_hostname && !continue_host_tried)
5304 int fd = cutthrough.cctx.sock >= 0 ? cutthrough.cctx.sock : 0;
5306 DEBUG(D_transport) debug_printf("no hosts match already-open connection\n");
5308 /* A TLS conn could be open for a cutthrough, but not for a plain continued-
5310 /*XXX doublecheck that! */
5312 if (cutthrough.cctx.sock >= 0 && cutthrough.is_tls)
5314 (void) tls_write(cutthrough.cctx.tls_ctx, US"QUIT\r\n", 6, FALSE);
5315 tls_close(cutthrough.cctx.tls_ctx, TLS_SHUTDOWN_NOWAIT);
5316 cutthrough.cctx.tls_ctx = NULL;
5317 cutthrough.is_tls = FALSE;
5321 (void) write(fd, US"QUIT\r\n", 6);
5324 cutthrough.cctx.sock = -1;
5325 continue_hostname = NULL;
5326 goto retry_non_continued;
5329 /* This is the end of the loop that repeats iff expired is TRUE and
5330 ob->delay_after_cutoff is FALSE. The second time round we will
5331 try those hosts that haven't been tried since the message arrived. */
5335 debug_printf("all IP addresses skipped or deferred at least one address\n");
5336 if (expired && !ob->delay_after_cutoff && cutoff_retry == 0)
5337 debug_printf("retrying IP addresses not tried since message arrived\n");
5342 /* Get here if all IP addresses are skipped or defer at least one address. In
5343 MUA wrapper mode, this will happen only for connection or other non-message-
5344 specific failures. Force the delivery status for all addresses to FAIL. */
5348 for (address_item * addr = addrlist; addr; addr = addr->next)
5349 addr->transport_return = FAIL;
5353 /* In the normal, non-wrapper case, add a standard message to each deferred
5354 address if there hasn't been an error, that is, if it hasn't actually been
5355 tried this time. The variable "expired" will be FALSE if any deliveries were
5356 actually tried, or if there was at least one host that was not expired. That
5357 is, it is TRUE only if no deliveries were tried and all hosts were expired. If
5358 a delivery has been tried, an error code will be set, and the failing of the
5359 message is handled by the retry code later.
5361 If queue_smtp is set, or this transport was called to send a subsequent message
5362 down an existing TCP/IP connection, and something caused the host not to be
5363 found, we end up here, but can detect these cases and handle them specially. */
5365 for (address_item * addr = addrlist; addr; addr = addr->next)
5367 /* If host is not NULL, it means that we stopped processing the host list
5368 because of hosts_max_try or hosts_max_try_hardlimit. In the former case, this
5369 means we need to behave as if some hosts were skipped because their retry
5370 time had not come. Specifically, this prevents the address from timing out.
5371 However, if we have hit hosts_max_try_hardlimit, we want to behave as if all
5372 hosts were tried. */
5375 if (total_hosts_tried >= ob->hosts_max_try_hardlimit)
5378 debug_printf("hosts_max_try_hardlimit reached: behave as if all "
5379 "hosts were tried\n");
5384 debug_printf("hosts_max_try limit caused some hosts to be skipped\n");
5385 setflag(addr, af_retry_skipped);
5388 if (f.queue_smtp) /* no deliveries attempted */
5390 addr->transport_return = DEFER;
5391 addr->basic_errno = 0;
5392 addr->message = US"SMTP delivery explicitly queued";
5395 else if ( addr->transport_return == DEFER
5396 && (addr->basic_errno == ERRNO_UNKNOWNERROR || addr->basic_errno == 0)
5400 addr->basic_errno = ERRNO_HRETRY;
5401 if (continue_hostname)
5402 addr->message = US"no host found for existing SMTP connection";
5405 setflag(addr, af_pass_message); /* This is not a security risk */
5406 addr->message = string_sprintf(
5407 "all hosts%s have been failing for a long time %s",
5408 addr->domain ? string_sprintf(" for '%s'", addr->domain) : US"",
5409 ob->delay_after_cutoff
5410 ? US"(and retry time not reached)"
5411 : US"and were last tried after this message arrived");
5413 /* If we are already using fallback hosts, or there are no fallback hosts
5414 defined, convert the result to FAIL to cause a bounce. */
5416 if (addr->host_list == addr->fallback_hosts || !addr->fallback_hosts)
5417 addr->transport_return = FAIL;
5422 if (hosts_retry == hosts_total)
5423 s = "retry time not reached for any host%s";
5424 else if (hosts_fail == hosts_total)
5425 s = "all host address lookups%s failed permanently";
5426 else if (hosts_defer == hosts_total)
5427 s = "all host address lookups%s failed temporarily";
5428 else if (hosts_serial == hosts_total)
5429 s = "connection limit reached for all hosts%s";
5430 else if (hosts_fail+hosts_defer == hosts_total)
5431 s = "all host address lookups%s failed";
5433 s = "some host address lookups failed and retry time "
5434 "not reached for other hosts or connection limit reached%s";
5436 addr->message = string_sprintf(s,
5437 addr->domain ? string_sprintf(" for '%s'", addr->domain) : US"");
5442 /* Update the database which keeps information about which messages are waiting
5443 for which hosts to become available. For some message-specific errors, the
5444 update_waiting flag is turned off because we don't want follow-on deliveries in
5445 those cases. If this transport instance is explicitly limited to one message
5446 per connection then follow-on deliveries are not possible and there's no need
5447 to create/update the per-transport wait-<transport_name> database. */
5449 if (update_waiting && tblock->connection_max_messages != 1)
5450 transport_update_waiting(hostlist, tblock->name);
5454 DEBUG(D_transport) debug_printf("Leaving %s transport\n", tblock->name);
5456 return TRUE; /* Each address has its status */
5459 #endif /*!MACRO_PREDEF*/
5462 /* End of transport/smtp.c */