1 /*************************************************
2 * Exim - an Internet mail transport agent *
3 *************************************************/
5 /* Copyright (c) University of Cambridge 1995 - 2018 */
6 /* See the file NOTICE for conditions of use and distribution. */
12 /* Options specific to the smtp transport. This transport also supports LMTP
13 over TCP/IP. The options must be in alphabetic order (note that "_" comes
14 before the lower case letters). Some live in the transport_instance block so as
15 to be publicly visible; these are flagged with opt_public. */
17 optionlist smtp_transport_options[] = {
18 { "*expand_multi_domain", opt_stringptr | opt_hidden | opt_public,
19 (void *)offsetof(transport_instance, expand_multi_domain) },
20 { "*expand_retry_include_ip_address", opt_stringptr | opt_hidden,
21 (void *)(offsetof(smtp_transport_options_block, expand_retry_include_ip_address)) },
23 { "address_retry_include_sender", opt_bool,
24 (void *)offsetof(smtp_transport_options_block, address_retry_include_sender) },
25 { "allow_localhost", opt_bool,
26 (void *)offsetof(smtp_transport_options_block, allow_localhost) },
27 #ifdef EXPERIMENTAL_ARC
28 { "arc_sign", opt_stringptr,
29 (void *)offsetof(smtp_transport_options_block, arc_sign) },
31 { "authenticated_sender", opt_stringptr,
32 (void *)offsetof(smtp_transport_options_block, authenticated_sender) },
33 { "authenticated_sender_force", opt_bool,
34 (void *)offsetof(smtp_transport_options_block, authenticated_sender_force) },
35 { "command_timeout", opt_time,
36 (void *)offsetof(smtp_transport_options_block, command_timeout) },
37 { "connect_timeout", opt_time,
38 (void *)offsetof(smtp_transport_options_block, connect_timeout) },
39 { "connection_max_messages", opt_int | opt_public,
40 (void *)offsetof(transport_instance, connection_max_messages) },
42 { "dane_require_tls_ciphers", opt_stringptr,
43 (void *)offsetof(smtp_transport_options_block, dane_require_tls_ciphers) },
45 { "data_timeout", opt_time,
46 (void *)offsetof(smtp_transport_options_block, data_timeout) },
47 { "delay_after_cutoff", opt_bool,
48 (void *)offsetof(smtp_transport_options_block, delay_after_cutoff) },
50 { "dkim_canon", opt_stringptr,
51 (void *)offsetof(smtp_transport_options_block, dkim.dkim_canon) },
52 { "dkim_domain", opt_stringptr,
53 (void *)offsetof(smtp_transport_options_block, dkim.dkim_domain) },
54 { "dkim_hash", opt_stringptr,
55 (void *)offsetof(smtp_transport_options_block, dkim.dkim_hash) },
56 { "dkim_identity", opt_stringptr,
57 (void *)offsetof(smtp_transport_options_block, dkim.dkim_identity) },
58 { "dkim_private_key", opt_stringptr,
59 (void *)offsetof(smtp_transport_options_block, dkim.dkim_private_key) },
60 { "dkim_selector", opt_stringptr,
61 (void *)offsetof(smtp_transport_options_block, dkim.dkim_selector) },
62 { "dkim_sign_headers", opt_stringptr,
63 (void *)offsetof(smtp_transport_options_block, dkim.dkim_sign_headers) },
64 { "dkim_strict", opt_stringptr,
65 (void *)offsetof(smtp_transport_options_block, dkim.dkim_strict) },
66 { "dkim_timestamps", opt_stringptr,
67 (void *)offsetof(smtp_transport_options_block, dkim.dkim_timestamps) },
69 { "dns_qualify_single", opt_bool,
70 (void *)offsetof(smtp_transport_options_block, dns_qualify_single) },
71 { "dns_search_parents", opt_bool,
72 (void *)offsetof(smtp_transport_options_block, dns_search_parents) },
73 { "dnssec_request_domains", opt_stringptr,
74 (void *)offsetof(smtp_transport_options_block, dnssec.request) },
75 { "dnssec_require_domains", opt_stringptr,
76 (void *)offsetof(smtp_transport_options_block, dnssec.require) },
77 { "dscp", opt_stringptr,
78 (void *)offsetof(smtp_transport_options_block, dscp) },
79 { "fallback_hosts", opt_stringptr,
80 (void *)offsetof(smtp_transport_options_block, fallback_hosts) },
81 { "final_timeout", opt_time,
82 (void *)offsetof(smtp_transport_options_block, final_timeout) },
83 { "gethostbyname", opt_bool,
84 (void *)offsetof(smtp_transport_options_block, gethostbyname) },
85 { "helo_data", opt_stringptr,
86 (void *)offsetof(smtp_transport_options_block, helo_data) },
87 { "hosts", opt_stringptr,
88 (void *)offsetof(smtp_transport_options_block, hosts) },
89 { "hosts_avoid_esmtp", opt_stringptr,
90 (void *)offsetof(smtp_transport_options_block, hosts_avoid_esmtp) },
91 { "hosts_avoid_pipelining", opt_stringptr,
92 (void *)offsetof(smtp_transport_options_block, hosts_avoid_pipelining) },
94 { "hosts_avoid_tls", opt_stringptr,
95 (void *)offsetof(smtp_transport_options_block, hosts_avoid_tls) },
97 { "hosts_max_try", opt_int,
98 (void *)offsetof(smtp_transport_options_block, hosts_max_try) },
99 { "hosts_max_try_hardlimit", opt_int,
100 (void *)offsetof(smtp_transport_options_block, hosts_max_try_hardlimit) },
102 { "hosts_nopass_tls", opt_stringptr,
103 (void *)offsetof(smtp_transport_options_block, hosts_nopass_tls) },
104 { "hosts_noproxy_tls", opt_stringptr,
105 (void *)offsetof(smtp_transport_options_block, hosts_noproxy_tls) },
107 { "hosts_override", opt_bool,
108 (void *)offsetof(smtp_transport_options_block, hosts_override) },
109 #ifdef SUPPORT_PIPE_CONNECT
110 { "hosts_pipe_connect", opt_stringptr,
111 (void *)offsetof(smtp_transport_options_block, hosts_pipe_connect) },
113 { "hosts_randomize", opt_bool,
114 (void *)offsetof(smtp_transport_options_block, hosts_randomize) },
115 #if !defined(DISABLE_TLS) && !defined(DISABLE_OCSP)
116 { "hosts_request_ocsp", opt_stringptr,
117 (void *)offsetof(smtp_transport_options_block, hosts_request_ocsp) },
119 { "hosts_require_auth", opt_stringptr,
120 (void *)offsetof(smtp_transport_options_block, hosts_require_auth) },
123 { "hosts_require_dane", opt_stringptr,
124 (void *)offsetof(smtp_transport_options_block, hosts_require_dane) },
126 # ifndef DISABLE_OCSP
127 { "hosts_require_ocsp", opt_stringptr,
128 (void *)offsetof(smtp_transport_options_block, hosts_require_ocsp) },
130 { "hosts_require_tls", opt_stringptr,
131 (void *)offsetof(smtp_transport_options_block, hosts_require_tls) },
133 { "hosts_try_auth", opt_stringptr,
134 (void *)offsetof(smtp_transport_options_block, hosts_try_auth) },
135 { "hosts_try_chunking", opt_stringptr,
136 (void *)offsetof(smtp_transport_options_block, hosts_try_chunking) },
138 { "hosts_try_dane", opt_stringptr,
139 (void *)offsetof(smtp_transport_options_block, hosts_try_dane) },
141 { "hosts_try_fastopen", opt_stringptr,
142 (void *)offsetof(smtp_transport_options_block, hosts_try_fastopen) },
144 { "hosts_try_prdr", opt_stringptr,
145 (void *)offsetof(smtp_transport_options_block, hosts_try_prdr) },
148 { "hosts_verify_avoid_tls", opt_stringptr,
149 (void *)offsetof(smtp_transport_options_block, hosts_verify_avoid_tls) },
151 { "interface", opt_stringptr,
152 (void *)offsetof(smtp_transport_options_block, interface) },
153 { "keepalive", opt_bool,
154 (void *)offsetof(smtp_transport_options_block, keepalive) },
155 { "lmtp_ignore_quota", opt_bool,
156 (void *)offsetof(smtp_transport_options_block, lmtp_ignore_quota) },
157 { "max_rcpt", opt_int | opt_public,
158 (void *)offsetof(transport_instance, max_addresses) },
159 { "multi_domain", opt_expand_bool | opt_public,
160 (void *)offsetof(transport_instance, multi_domain) },
161 { "port", opt_stringptr,
162 (void *)offsetof(smtp_transport_options_block, port) },
163 { "protocol", opt_stringptr,
164 (void *)offsetof(smtp_transport_options_block, protocol) },
165 { "retry_include_ip_address", opt_expand_bool,
166 (void *)offsetof(smtp_transport_options_block, retry_include_ip_address) },
167 { "serialize_hosts", opt_stringptr,
168 (void *)offsetof(smtp_transport_options_block, serialize_hosts) },
169 { "size_addition", opt_int,
170 (void *)offsetof(smtp_transport_options_block, size_addition) },
172 { "socks_proxy", opt_stringptr,
173 (void *)offsetof(smtp_transport_options_block, socks_proxy) },
176 { "tls_certificate", opt_stringptr,
177 (void *)offsetof(smtp_transport_options_block, tls_certificate) },
178 { "tls_crl", opt_stringptr,
179 (void *)offsetof(smtp_transport_options_block, tls_crl) },
180 { "tls_dh_min_bits", opt_int,
181 (void *)offsetof(smtp_transport_options_block, tls_dh_min_bits) },
182 { "tls_privatekey", opt_stringptr,
183 (void *)offsetof(smtp_transport_options_block, tls_privatekey) },
184 { "tls_require_ciphers", opt_stringptr,
185 (void *)offsetof(smtp_transport_options_block, tls_require_ciphers) },
186 # ifdef EXPERIMENTAL_TLS_RESUME
187 { "tls_resumption_hosts", opt_stringptr,
188 (void *)offsetof(smtp_transport_options_block, tls_resumption_hosts) },
190 { "tls_sni", opt_stringptr,
191 (void *)offsetof(smtp_transport_options_block, tls_sni) },
192 { "tls_tempfail_tryclear", opt_bool,
193 (void *)offsetof(smtp_transport_options_block, tls_tempfail_tryclear) },
194 { "tls_try_verify_hosts", opt_stringptr,
195 (void *)offsetof(smtp_transport_options_block, tls_try_verify_hosts) },
196 { "tls_verify_cert_hostnames", opt_stringptr,
197 (void *)offsetof(smtp_transport_options_block,tls_verify_cert_hostnames)},
198 { "tls_verify_certificates", opt_stringptr,
199 (void *)offsetof(smtp_transport_options_block, tls_verify_certificates) },
200 { "tls_verify_hosts", opt_stringptr,
201 (void *)offsetof(smtp_transport_options_block, tls_verify_hosts) },
204 { "utf8_downconvert", opt_stringptr,
205 (void *)offsetof(smtp_transport_options_block, utf8_downconvert) },
209 /* Size of the options list. An extern variable has to be used so that its
210 address can appear in the tables drtables.c. */
212 int smtp_transport_options_count = nelem(smtp_transport_options);
218 smtp_transport_options_block smtp_transport_option_defaults = {0};
219 void smtp_transport_init(transport_instance *tblock) {}
220 BOOL smtp_transport_entry(transport_instance *tblock, address_item *addr) {return FALSE;}
221 void smtp_transport_closedown(transport_instance *tblock) {}
223 #else /*!MACRO_PREDEF*/
226 /* Default private options block for the smtp transport. */
228 smtp_transport_options_block smtp_transport_option_defaults = {
230 .fallback_hosts = NULL,
232 .fallback_hostlist = NULL,
233 .helo_data = US"$primary_hostname",
236 .protocol = US"smtp",
238 .serialize_hosts = NULL,
239 .hosts_try_auth = NULL,
240 .hosts_require_auth = NULL,
241 .hosts_try_chunking = US"*",
243 .hosts_try_dane = US"*",
244 .hosts_require_dane = NULL,
245 .dane_require_tls_ciphers = NULL,
247 .hosts_try_fastopen = US"*",
249 .hosts_try_prdr = US"*",
252 .hosts_request_ocsp = US"*", /* hosts_request_ocsp (except under DANE; tls_client_start()) */
253 .hosts_require_ocsp = NULL,
255 .hosts_require_tls = NULL,
256 .hosts_avoid_tls = NULL,
257 .hosts_verify_avoid_tls = NULL,
258 .hosts_avoid_pipelining = NULL,
259 #ifdef SUPPORT_PIPE_CONNECT
260 .hosts_pipe_connect = NULL,
262 .hosts_avoid_esmtp = NULL,
264 .hosts_nopass_tls = NULL,
265 .hosts_noproxy_tls = NULL,
267 .command_timeout = 5*60,
268 .connect_timeout = 5*60,
269 .data_timeout = 5*60,
270 .final_timeout = 10*60,
271 .size_addition = 1024,
273 .hosts_max_try_hardlimit = 50,
274 .address_retry_include_sender = TRUE,
275 .allow_localhost = FALSE,
276 .authenticated_sender_force = FALSE,
277 .gethostbyname = FALSE,
278 .dns_qualify_single = TRUE,
279 .dns_search_parents = FALSE,
280 .dnssec = { .request=NULL, .require=NULL },
281 .delay_after_cutoff = TRUE,
282 .hosts_override = FALSE,
283 .hosts_randomize = FALSE,
285 .lmtp_ignore_quota = FALSE,
286 .expand_retry_include_ip_address = NULL,
287 .retry_include_ip_address = TRUE,
292 .tls_certificate = NULL,
294 .tls_privatekey = NULL,
295 .tls_require_ciphers = NULL,
297 .tls_verify_certificates = US"system",
298 .tls_dh_min_bits = EXIM_CLIENT_DH_DEFAULT_MIN_BITS,
299 .tls_tempfail_tryclear = TRUE,
300 # ifdef EXPERIMENTAL_TLS_RESUME
301 .tls_resumption_hosts = NULL,
303 .tls_verify_hosts = NULL,
304 .tls_try_verify_hosts = US"*",
305 .tls_verify_cert_hostnames = US"*",
308 .utf8_downconvert = NULL,
312 {.dkim_domain = NULL,
313 .dkim_identity = NULL,
314 .dkim_private_key = NULL,
315 .dkim_selector = NULL,
317 .dkim_sign_headers = NULL,
319 .dkim_hash = US"sha256",
320 .dkim_timestamps = NULL,
321 .dot_stuffed = FALSE,
322 .force_bodyhash = FALSE,
323 # ifdef EXPERIMENTAL_ARC
324 .arc_signspec = NULL,
327 # ifdef EXPERIMENTAL_ARC
333 /* some DSN flags for use later */
335 static int rf_list[] = {rf_notify_never, rf_notify_success,
336 rf_notify_failure, rf_notify_delay };
338 static uschar *rf_names[] = { US"NEVER", US"SUCCESS", US"FAILURE", US"DELAY" };
344 static uschar *smtp_command; /* Points to last cmd for error messages */
345 static uschar *mail_command; /* Points to MAIL cmd for error messages */
346 static uschar *data_command = US""; /* Points to DATA cmd for error messages */
347 static BOOL update_waiting; /* TRUE to update the "wait" database */
349 /*XXX move to smtp_context */
350 static BOOL pipelining_active; /* current transaction is in pipe mode */
353 static unsigned ehlo_response(uschar * buf, unsigned checks);
356 /*************************************************
357 * Setup entry point *
358 *************************************************/
360 /* This function is called when the transport is about to be used,
361 but before running it in a sub-process. It is used for two things:
363 (1) To set the fallback host list in addresses, when delivering.
364 (2) To pass back the interface, port, protocol, and other options, for use
365 during callout verification.
368 tblock pointer to the transport instance block
369 addrlist list of addresses about to be transported
370 tf if not NULL, pointer to block in which to return options
371 uid the uid that will be set (not used)
372 gid the gid that will be set (not used)
373 errmsg place for error message (not used)
375 Returns: OK always (FAIL, DEFER not used)
379 smtp_transport_setup(transport_instance *tblock, address_item *addrlist,
380 transport_feedback *tf, uid_t uid, gid_t gid, uschar **errmsg)
382 smtp_transport_options_block *ob = SOB tblock->options_block;
384 errmsg = errmsg; /* Keep picky compilers happy */
388 /* Pass back options if required. This interface is getting very messy. */
392 tf->interface = ob->interface;
394 tf->protocol = ob->protocol;
395 tf->hosts = ob->hosts;
396 tf->hosts_override = ob->hosts_override;
397 tf->hosts_randomize = ob->hosts_randomize;
398 tf->gethostbyname = ob->gethostbyname;
399 tf->qualify_single = ob->dns_qualify_single;
400 tf->search_parents = ob->dns_search_parents;
401 tf->helo_data = ob->helo_data;
404 /* Set the fallback host list for all the addresses that don't have fallback
405 host lists, provided that the local host wasn't present in the original host
408 if (!testflag(addrlist, af_local_host_removed))
409 for (; addrlist; addrlist = addrlist->next)
410 if (!addrlist->fallback_hosts) addrlist->fallback_hosts = ob->fallback_hostlist;
417 /*************************************************
418 * Initialization entry point *
419 *************************************************/
421 /* Called for each instance, after its options have been read, to
422 enable consistency checks to be done, or anything else that needs
425 Argument: pointer to the transport instance block
430 smtp_transport_init(transport_instance *tblock)
432 smtp_transport_options_block *ob = SOB tblock->options_block;
434 /* Retry_use_local_part defaults FALSE if unset */
436 if (tblock->retry_use_local_part == TRUE_UNSET)
437 tblock->retry_use_local_part = FALSE;
439 /* Set the default port according to the protocol */
442 ob->port = strcmpic(ob->protocol, US"lmtp") == 0
444 : strcmpic(ob->protocol, US"smtps") == 0
445 ? US"smtps" : US"smtp";
447 /* Set up the setup entry point, to be called before subprocesses for this
450 tblock->setup = smtp_transport_setup;
452 /* Complain if any of the timeouts are zero. */
454 if (ob->command_timeout <= 0 || ob->data_timeout <= 0 ||
455 ob->final_timeout <= 0)
456 log_write(0, LOG_PANIC_DIE|LOG_CONFIG,
457 "command, data, or final timeout value is zero for %s transport",
460 /* If hosts_override is set and there are local hosts, set the global
461 flag that stops verify from showing router hosts. */
463 if (ob->hosts_override && ob->hosts != NULL) tblock->overrides_hosts = TRUE;
465 /* If there are any fallback hosts listed, build a chain of host items
466 for them, but do not do any lookups at this time. */
468 host_build_hostlist(&(ob->fallback_hostlist), ob->fallback_hosts, FALSE);
475 /*************************************************
476 * Set delivery info into all active addresses *
477 *************************************************/
479 /* Only addresses whose status is >= PENDING are relevant. A lesser
480 status means that an address is not currently being processed.
483 addrlist points to a chain of addresses
484 errno_value to put in each address's errno field
485 msg to put in each address's message field
486 rc to put in each address's transport_return field
487 pass_message if TRUE, set the "pass message" flag in the address
488 host if set, mark addrs as having used this host
489 smtp_greeting from peer
490 helo_response from peer
492 If errno_value has the special value ERRNO_CONNECTTIMEOUT, ETIMEDOUT is put in
493 the errno field, and RTEF_CTOUT is ORed into the more_errno field, to indicate
494 this particular type of timeout.
500 set_errno(address_item *addrlist, int errno_value, uschar *msg, int rc,
501 BOOL pass_message, host_item * host
502 #ifdef EXPERIMENTAL_DSN_INFO
503 , const uschar * smtp_greeting, const uschar * helo_response
508 if (errno_value == ERRNO_CONNECTTIMEOUT)
510 errno_value = ETIMEDOUT;
511 orvalue = RTEF_CTOUT;
513 for (address_item * addr = addrlist; addr; addr = addr->next)
514 if (addr->transport_return >= PENDING)
516 addr->basic_errno = errno_value;
517 addr->more_errno |= orvalue;
521 if (pass_message) setflag(addr, af_pass_message);
523 addr->transport_return = rc;
526 addr->host_used = host;
527 #ifdef EXPERIMENTAL_DSN_INFO
529 {uschar * s = Ustrchr(smtp_greeting, '\n'); if (s) *s = '\0';}
530 addr->smtp_greeting = smtp_greeting;
533 {uschar * s = Ustrchr(helo_response, '\n'); if (s) *s = '\0';}
534 addr->helo_response = helo_response;
541 set_errno_nohost(address_item *addrlist, int errno_value, uschar *msg, int rc,
544 set_errno(addrlist, errno_value, msg, rc, pass_message, NULL
545 #ifdef EXPERIMENTAL_DSN_INFO
552 /*************************************************
553 * Check an SMTP response *
554 *************************************************/
556 /* This function is given an errno code and the SMTP response buffer
557 to analyse, together with the host identification for generating messages. It
558 sets an appropriate message and puts the first digit of the response code into
559 the yield variable. If no response was actually read, a suitable digit is
563 host the current host, to get its name for messages
564 errno_value pointer to the errno value
565 more_errno from the top address for use with ERRNO_FILTER_FAIL
566 buffer the SMTP response buffer
567 yield where to put a one-digit SMTP response code
568 message where to put an error message
569 pass_message set TRUE if message is an SMTP response
571 Returns: TRUE if an SMTP "QUIT" command should be sent, else FALSE
575 check_response(host_item *host, int *errno_value, int more_errno,
576 uschar *buffer, int *yield, uschar **message, BOOL *pass_message)
578 uschar * pl = pipelining_active ? US"pipelined " : US"";
581 *yield = '4'; /* Default setting is to give a temporary error */
585 case ETIMEDOUT: /* Handle response timeout */
586 *message = US string_sprintf("SMTP timeout after %s%s",
588 if (transport_count > 0)
589 *message = US string_sprintf("%s (%d bytes written)", *message,
593 case ERRNO_SMTPFORMAT: /* Handle malformed SMTP response */
594 s = string_printing(buffer);
595 while (isspace(*s)) s++;
597 ? string_sprintf("Malformed SMTP reply (an empty line) "
598 "in response to %s%s", pl, smtp_command)
599 : string_sprintf("Malformed SMTP reply in response to %s%s: %s",
600 pl, smtp_command, s);
603 case ERRNO_TLSFAILURE: /* Handle bad first read; can happen with
605 *message = US"bad first read from TLS conn";
608 case ERRNO_FILTER_FAIL: /* Handle a failed filter process error;
609 can't send QUIT as we mustn't end the DATA. */
610 *message = string_sprintf("transport filter process failed (%d)%s",
612 more_errno == EX_EXECFAILED ? ": unable to execute command" : "");
615 case ERRNO_CHHEADER_FAIL: /* Handle a failed add_headers expansion;
616 can't send QUIT as we mustn't end the DATA. */
618 string_sprintf("failed to expand headers_add or headers_remove: %s",
619 expand_string_message);
622 case ERRNO_WRITEINCOMPLETE: /* failure to write a complete data block */
623 *message = 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 SUPPORT_PIPE_CONNECT
820 ehlo_cache_key(const smtp_context * sx)
822 host_item * host = sx->conn_args.host;
823 return Ustrchr(host->address, ':')
824 ? string_sprintf("[%s]:%d.EHLO", host->address,
825 host->port == PORT_NONE ? sx->port : host->port)
826 : string_sprintf("%s:%d.EHLO", host->address,
827 host->port == PORT_NONE ? sx->port : host->port);
831 write_ehlo_cache_entry(const smtp_context * sx)
833 open_db dbblock, * dbm_file;
835 if ((dbm_file = dbfn_open(US"misc", O_RDWR, &dbblock, TRUE, TRUE)))
837 uschar * ehlo_resp_key = ehlo_cache_key(sx);
838 dbdata_ehlo_resp er = { .data = sx->ehlo_resp };
840 HDEBUG(D_transport) debug_printf("writing clr %04x/%04x cry %04x/%04x\n",
841 sx->ehlo_resp.cleartext_features, sx->ehlo_resp.cleartext_auths,
842 sx->ehlo_resp.crypted_features, sx->ehlo_resp.crypted_auths);
844 dbfn_write(dbm_file, ehlo_resp_key, &er, (int)sizeof(er));
845 dbfn_close(dbm_file);
850 invalidate_ehlo_cache_entry(smtp_context * sx)
852 open_db dbblock, * dbm_file;
854 if ( sx->early_pipe_active
855 && (dbm_file = dbfn_open(US"misc", O_RDWR, &dbblock, TRUE, TRUE)))
857 uschar * ehlo_resp_key = ehlo_cache_key(sx);
858 dbfn_delete(dbm_file, ehlo_resp_key);
859 dbfn_close(dbm_file);
864 read_ehlo_cache_entry(smtp_context * sx)
869 if (!(dbm_file = dbfn_open(US"misc", O_RDONLY, &dbblock, FALSE, TRUE)))
870 { DEBUG(D_transport) debug_printf("ehlo-cache: no misc DB\n"); }
873 uschar * ehlo_resp_key = ehlo_cache_key(sx);
874 dbdata_ehlo_resp * er;
876 if (!(er = dbfn_read(dbm_file, ehlo_resp_key)))
877 { DEBUG(D_transport) debug_printf("no ehlo-resp record\n"); }
878 else if (time(NULL) - er->time_stamp > retry_data_expire)
880 DEBUG(D_transport) debug_printf("ehlo-resp record too old\n");
881 dbfn_close(dbm_file);
882 if ((dbm_file = dbfn_open(US"misc", O_RDWR, &dbblock, TRUE, TRUE)))
883 dbfn_delete(dbm_file, ehlo_resp_key);
887 sx->ehlo_resp = er->data;
888 dbfn_close(dbm_file);
889 DEBUG(D_transport) debug_printf(
890 "EHLO response bits from cache: cleartext 0x%04x crypted 0x%04x\n",
891 er->data.cleartext_features, er->data.crypted_features);
894 dbfn_close(dbm_file);
901 /* Return an auths bitmap for the set of AUTH methods offered by the server
902 which match our authenticators. */
904 static unsigned short
905 study_ehlo_auths(smtp_context * sx)
910 unsigned short authbits = 0;
912 if (!sx->esmtp) return 0;
913 if (!regex_AUTH) regex_AUTH = regex_must_compile(AUTHS_REGEX, FALSE, TRUE);
914 if (!regex_match_and_setup(regex_AUTH, sx->buffer, 0, -1)) return 0;
915 expand_nmax = -1; /* reset */
916 names = string_copyn(expand_nstring[1], expand_nlength[1]);
918 for (au = auths, authnum = 0; au; au = au->next, authnum++) if (au->client)
920 const uschar * list = names;
924 while (string_nextinlist(&list, &sep, name, sizeof(name)))
925 if (strcmpic(au->public_name, name) == 0)
926 { authbits |= BIT(authnum); break; }
930 debug_printf("server offers %s AUTH, methods '%s', bitmap 0x%04x\n",
931 tls_out.active.sock >= 0 ? "crypted" : "plaintext", names, authbits);
933 if (tls_out.active.sock >= 0)
934 sx->ehlo_resp.crypted_auths = authbits;
936 sx->ehlo_resp.cleartext_auths = authbits;
943 /* Wait for and check responses for early-pipelining.
945 Called from the lower-level smtp_read_response() function
946 used for general code that assume synchronisation, if context
947 flags indicate outstanding early-pipelining commands. Also
948 called fom sync_responses() which handles pipelined commands.
951 sx smtp connection context
952 countp number of outstanding responses, adjusted on return
956 DEFER error on first read of TLS'd conn
957 FAIL SMTP error in response
960 smtp_reap_early_pipe(smtp_context * sx, int * countp)
962 BOOL pending_BANNER = sx->pending_BANNER;
963 BOOL pending_EHLO = sx->pending_EHLO;
966 sx->pending_BANNER = FALSE; /* clear early to avoid recursion */
967 sx->pending_EHLO = FALSE;
971 DEBUG(D_transport) debug_printf("%s expect banner\n", __FUNCTION__);
973 if (!smtp_reap_banner(sx))
975 DEBUG(D_transport) debug_printf("bad banner\n");
976 if (tls_out.active.sock >= 0) rc = DEFER;
983 unsigned peer_offered;
984 unsigned short authbits = 0, * ap;
986 DEBUG(D_transport) debug_printf("%s expect ehlo\n", __FUNCTION__);
988 if (!smtp_reap_ehlo(sx))
990 DEBUG(D_transport) debug_printf("bad response for EHLO\n");
991 if (tls_out.active.sock >= 0) rc = DEFER;
995 /* Compare the actual EHLO response to the cached value we assumed;
996 on difference, dump or rewrite the cache and arrange for a retry. */
998 ap = tls_out.active.sock < 0
999 ? &sx->ehlo_resp.cleartext_auths : &sx->ehlo_resp.crypted_auths;
1001 peer_offered = ehlo_response(sx->buffer,
1002 (tls_out.active.sock < 0 ? OPTION_TLS : 0)
1003 | OPTION_CHUNKING | OPTION_PRDR | OPTION_DSN | OPTION_PIPE | OPTION_SIZE
1004 | OPTION_UTF8 | OPTION_EARLY_PIPE
1006 if ( peer_offered != sx->peer_offered
1007 || (authbits = study_ehlo_auths(sx)) != *ap)
1010 debug_printf("EHLO %s extensions changed, 0x%04x/0x%04x -> 0x%04x/0x%04x\n",
1011 tls_out.active.sock < 0 ? "cleartext" : "crypted",
1012 sx->peer_offered, *ap, peer_offered, authbits);
1013 *(tls_out.active.sock < 0
1014 ? &sx->ehlo_resp.cleartext_features : &sx->ehlo_resp.crypted_features) = peer_offered;
1016 if (peer_offered & OPTION_EARLY_PIPE)
1017 write_ehlo_cache_entry(sx);
1019 invalidate_ehlo_cache_entry(sx);
1021 return OK; /* just carry on */
1027 invalidate_ehlo_cache_entry(sx);
1028 (void) smtp_discard_responses(sx, sx->conn_args.ob, *countp);
1034 /*************************************************
1035 * Synchronize SMTP responses *
1036 *************************************************/
1038 /* This function is called from smtp_deliver() to receive SMTP responses from
1039 the server, and match them up with the commands to which they relate. When
1040 PIPELINING is not in use, this function is called after every command, and is
1041 therefore somewhat over-engineered, but it is simpler to use a single scheme
1042 that works both with and without PIPELINING instead of having two separate sets
1045 The set of commands that are buffered up with pipelining may start with MAIL
1046 and may end with DATA; in between are RCPT commands that correspond to the
1047 addresses whose status is PENDING_DEFER. All other commands (STARTTLS, AUTH,
1048 etc.) are never buffered.
1050 Errors after MAIL or DATA abort the whole process leaving the response in the
1051 buffer. After MAIL, pending responses are flushed, and the original command is
1052 re-instated in big_buffer for error messages. For RCPT commands, the remote is
1053 permitted to reject some recipient addresses while accepting others. However
1054 certain errors clearly abort the whole process. Set the value in
1055 transport_return to PENDING_OK if the address is accepted. If there is a
1056 subsequent general error, it will get reset accordingly. If not, it will get
1057 converted to OK at the end.
1060 sx smtp connection context
1061 count the number of responses to read
1062 pending_DATA 0 if last command sent was not DATA
1063 +1 if previously had a good recipient
1064 -1 if not previously had a good recipient
1066 Returns: 3 if at least one address had 2xx and one had 5xx
1067 2 if at least one address had 5xx but none had 2xx
1068 1 if at least one host had a 2xx response, but none had 5xx
1069 0 no address had 2xx or 5xx but no errors (all 4xx, or just DATA)
1070 -1 timeout while reading RCPT response
1071 -2 I/O or other non-response error for RCPT
1072 -3 DATA or MAIL failed - errno and buffer set
1073 -4 banner or EHLO failed (early-pipelining)
1074 -5 banner or EHLO failed (early-pipelining, TLS)
1078 sync_responses(smtp_context * sx, int count, int pending_DATA)
1080 address_item * addr = sx->sync_addr;
1081 smtp_transport_options_block * ob = sx->conn_args.ob;
1084 #ifdef SUPPORT_PIPE_CONNECT
1086 if ((rc = smtp_reap_early_pipe(sx, &count)) != OK)
1087 return rc == FAIL ? -4 : -5;
1090 /* Handle the response for a MAIL command. On error, reinstate the original
1091 command in big_buffer for error message use, and flush any further pending
1092 responses before returning, except after I/O errors and timeouts. */
1094 if (sx->pending_MAIL)
1096 DEBUG(D_transport) debug_printf("%s expect mail\n", __FUNCTION__);
1098 if (!smtp_read_response(sx, sx->buffer, sizeof(sx->buffer),
1099 '2', ob->command_timeout))
1101 DEBUG(D_transport) debug_printf("bad response for MAIL\n");
1102 Ustrcpy(big_buffer, mail_command); /* Fits, because it came from there! */
1103 if (errno == ERRNO_TLSFAILURE)
1105 if (errno == 0 && sx->buffer[0] != 0)
1108 if (sx->buffer[0] == '4')
1110 save_errno = ERRNO_MAIL4XX;
1111 addr->more_errno |= ((sx->buffer[1] - '0')*10 + sx->buffer[2] - '0') << 8;
1113 count = smtp_discard_responses(sx, ob, count);
1117 if (pending_DATA) count--; /* Number of RCPT responses to come */
1118 while (count-- > 0) /* Mark any pending addrs with the host used */
1120 while (addr->transport_return != PENDING_DEFER) addr = addr->next;
1121 addr->host_used = sx->conn_args.host;
1128 if (pending_DATA) count--; /* Number of RCPT responses to come */
1130 /* Read and handle the required number of RCPT responses, matching each one up
1131 with an address by scanning for the next address whose status is PENDING_DEFER.
1136 while (addr->transport_return != PENDING_DEFER)
1137 if (!(addr = addr->next))
1140 /* The address was accepted */
1141 addr->host_used = sx->conn_args.host;
1143 DEBUG(D_transport) debug_printf("%s expect rcpt\n", __FUNCTION__);
1144 if (smtp_read_response(sx, sx->buffer, sizeof(sx->buffer),
1145 '2', ob->command_timeout))
1148 addr->transport_return = PENDING_OK;
1150 /* If af_dr_retry_exists is set, there was a routing delay on this address;
1151 ensure that any address-specific retry record is expunged. We do this both
1152 for the basic key and for the version that also includes the sender. */
1154 if (testflag(addr, af_dr_retry_exists))
1156 uschar *altkey = string_sprintf("%s:<%s>", addr->address_retry_key,
1158 retry_add_item(addr, altkey, rf_delete);
1159 retry_add_item(addr, addr->address_retry_key, rf_delete);
1163 /* Error on first TLS read */
1165 else if (errno == ERRNO_TLSFAILURE)
1168 /* Timeout while reading the response */
1170 else if (errno == ETIMEDOUT)
1172 uschar *message = string_sprintf("SMTP timeout after RCPT TO:<%s>",
1173 transport_rcpt_address(addr, sx->conn_args.tblock->rcpt_include_affixes));
1174 set_errno_nohost(sx->first_addr, ETIMEDOUT, message, DEFER, FALSE);
1175 retry_add_item(addr, addr->address_retry_key, 0);
1176 update_waiting = FALSE;
1180 /* Handle other errors in obtaining an SMTP response by returning -1. This
1181 will cause all the addresses to be deferred. Restore the SMTP command in
1182 big_buffer for which we are checking the response, so the error message
1185 else if (errno != 0 || sx->buffer[0] == 0)
1187 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 SUPPORT_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 SUPPORT_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 SUPPORT_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 SUPPORT_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 SUPPORT_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 SUPPORT_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 SUPPORT_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 SUPPORT_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 SUPPORT_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 SUPPORT_PIPE_CONNECT
2109 if ( verify_check_given_host(CUSS &ob->hosts_pipe_connect,
2110 sx->conn_args.host) == OK)
2112 /* We don't find out the local ip address until the connect, so if
2113 the helo string might use it avoid doing early-pipelining. */
2116 || !Ustrstr(sx->helo_data, "$sending_ip_address")
2117 || Ustrstr(sx->helo_data, "def:sending_ip_address")
2120 sx->early_pipe_ok = TRUE;
2121 if ( read_ehlo_cache_entry(sx)
2122 && sx->ehlo_resp.cleartext_features & OPTION_EARLY_PIPE)
2125 debug_printf("Using cached cleartext PIPE_CONNECT\n");
2126 sx->early_pipe_active = TRUE;
2127 sx->peer_offered = sx->ehlo_resp.cleartext_features;
2130 else DEBUG(D_transport)
2131 debug_printf("helo needs $sending_ip_address\n");
2133 if (sx->early_pipe_active)
2134 sx->outblock.conn_args = &sx->conn_args;
2138 if ((sx->cctx.sock = smtp_connect(&sx->conn_args, NULL)) < 0)
2140 set_errno_nohost(sx->addrlist,
2141 errno == ETIMEDOUT ? ERRNO_CONNECTTIMEOUT : errno,
2142 sx->verify ? US strerror(errno) : NULL,
2144 sx->send_quit = FALSE;
2148 /* Expand the greeting message while waiting for the initial response. (Makes
2149 sense if helo_data contains ${lookup dnsdb ...} stuff). The expansion is
2150 delayed till here so that $sending_interface and $sending_port are set. */
2151 /*XXX early-pipe: they still will not be. Is there any way to find out what they
2152 will be? Somehow I doubt it. */
2155 if (!(sx->helo_data = expand_string(sx->helo_data)))
2157 log_write(0, LOG_MAIN|LOG_PANIC,
2158 "<%s>: failed to expand transport's helo_data value for callout: %s",
2159 sx->addrlist->address, expand_string_message);
2164 expand_string_message = NULL;
2165 if ((sx->helo_data = string_domain_utf8_to_alabel(sx->helo_data,
2166 &expand_string_message)),
2167 expand_string_message)
2169 log_write(0, LOG_MAIN|LOG_PANIC,
2170 "<%s>: failed to expand transport's helo_data value for callout: %s",
2171 sx->addrlist->address, expand_string_message);
2173 sx->helo_data = NULL;
2177 /* The first thing is to wait for an initial OK response. The dreaded "goto"
2178 is nevertheless a reasonably clean way of programming this kind of logic,
2179 where you want to escape on any error. */
2183 #ifdef SUPPORT_PIPE_CONNECT
2184 if (sx->early_pipe_active)
2186 sx->pending_BANNER = TRUE; /* sync_responses() must eventually handle */
2187 sx->outblock.cmd_count = 1;
2193 (void) setsockopt(sx->cctx.sock, IPPROTO_TCP, TCP_QUICKACK, US &off,
2196 if (!smtp_reap_banner(sx))
2197 goto RESPONSE_FAILED;
2200 #ifndef DISABLE_EVENT
2203 lookup_dnssec_authenticated = sx->conn_args.host->dnssec==DS_YES ? US"yes"
2204 : sx->conn_args.host->dnssec==DS_NO ? US"no" : NULL;
2205 s = event_raise(sx->conn_args.tblock->event_action, US"smtp:connect", sx->buffer);
2208 set_errno_nohost(sx->addrlist, ERRNO_EXPANDFAIL,
2209 string_sprintf("deferred by smtp:connect event expansion: %s", s),
2217 /* Now check if the helo_data expansion went well, and sign off cleanly if
2222 message = string_sprintf("failed to expand helo_data: %s",
2223 expand_string_message);
2224 set_errno_nohost(sx->addrlist, ERRNO_EXPANDFAIL, message, DEFER, FALSE);
2230 /** Debugging without sending a message
2231 sx->addrlist->transport_return = DEFER;
2235 /* Errors that occur after this point follow an SMTP command, which is
2236 left in big_buffer by smtp_write_command() for use in error messages. */
2238 smtp_command = big_buffer;
2240 /* Tell the remote who we are...
2242 February 1998: A convention has evolved that ESMTP-speaking MTAs include the
2243 string "ESMTP" in their greeting lines, so make Exim send EHLO if the
2244 greeting is of this form. The assumption was that the far end supports it
2245 properly... but experience shows that there are some that give 5xx responses,
2246 even though the banner includes "ESMTP" (there's a bloody-minded one that
2247 says "ESMTP not spoken here"). Cope with that case.
2249 September 2000: Time has passed, and it seems reasonable now to always send
2250 EHLO at the start. It is also convenient to make the change while installing
2253 July 2003: Joachim Wieland met a broken server that advertises "PIPELINING"
2254 but times out after sending MAIL FROM, RCPT TO and DATA all together. There
2255 would be no way to send out the mails, so there is now a host list
2256 "hosts_avoid_esmtp" that disables ESMTP for special hosts and solves the
2257 PIPELINING problem as well. Maybe it can also be useful to cure other
2258 problems with broken servers.
2260 Exim originally sent "Helo" at this point and ran for nearly a year that way.
2261 Then somebody tried it with a Microsoft mailer... It seems that all other
2262 mailers use upper case for some reason (the RFC is quite clear about case
2263 independence) so, for peace of mind, I gave in. */
2265 sx->esmtp = verify_check_given_host(CUSS &ob->hosts_avoid_esmtp, sx->conn_args.host) != OK;
2267 /* Alas; be careful, since this goto is not an error-out, so conceivably
2268 we might set data between here and the target which we assume to exist
2269 and be usable. I can see this coming back to bite us. */
2273 smtp_peer_options |= OPTION_TLS;
2274 suppress_tls = FALSE;
2275 ob->tls_tempfail_tryclear = FALSE;
2276 smtp_command = US"SSL-on-connect";
2283 if (smtp_write_command(sx,
2284 #ifdef SUPPORT_PIPE_CONNECT
2285 sx->early_pipe_active ? SCMD_BUFFER :
2288 "%s %s\r\n", sx->lmtp ? "LHLO" : "EHLO", sx->helo_data) < 0)
2290 sx->esmtp_sent = TRUE;
2292 #ifdef SUPPORT_PIPE_CONNECT
2293 if (sx->early_pipe_active)
2295 sx->pending_EHLO = TRUE;
2297 /* If we have too many authenticators to handle and might need to AUTH
2298 for this transport, pipeline no further as we will need the
2299 list of auth methods offered. Reap the banner and EHLO. */
2301 if ( (ob->hosts_require_auth || ob->hosts_try_auth)
2302 && f.smtp_in_early_pipe_no_auth)
2304 DEBUG(D_transport) debug_printf("may need to auth, so pipeline no further\n");
2305 if (smtp_write_command(sx, SCMD_FLUSH, NULL) < 0)
2307 if (sync_responses(sx, 2, 0) != 0)
2310 debug_printf("failed reaping pipelined cmd responses\n");
2311 goto RESPONSE_FAILED;
2313 sx->early_pipe_active = FALSE;
2318 if (!smtp_reap_ehlo(sx))
2319 goto RESPONSE_FAILED;
2323 debug_printf("not sending EHLO (host matches hosts_avoid_esmtp)\n");
2325 #ifdef SUPPORT_PIPE_CONNECT
2326 if (!sx->early_pipe_active)
2331 int n = sizeof(sx->buffer);
2332 uschar * rsp = sx->buffer;
2334 if (sx->esmtp_sent && (n = Ustrlen(sx->buffer)) < sizeof(sx->buffer)/2)
2335 { rsp = sx->buffer + n + 1; n = sizeof(sx->buffer) - n; }
2337 if (smtp_write_command(sx, SCMD_FLUSH, "HELO %s\r\n", sx->helo_data) < 0)
2339 good_response = smtp_read_response(sx, rsp, n, '2', ob->command_timeout);
2340 #ifdef EXPERIMENTAL_DSN_INFO
2341 sx->helo_response = string_copy(rsp);
2345 /* Handle special logging for a closed connection after HELO
2346 when had previously sent EHLO */
2348 if (rsp != sx->buffer && rsp[0] == 0 && (errno == 0 || errno == ECONNRESET))
2350 errno = ERRNO_SMTPCLOSED;
2351 goto EHLOHELO_FAILED;
2353 memmove(sx->buffer, rsp, Ustrlen(rsp));
2354 goto RESPONSE_FAILED;
2358 if (sx->esmtp || sx->lmtp)
2360 #ifdef SUPPORT_PIPE_CONNECT
2361 if (!sx->early_pipe_active)
2364 sx->peer_offered = ehlo_response(sx->buffer,
2365 OPTION_TLS /* others checked later */
2366 #ifdef SUPPORT_PIPE_CONNECT
2367 | (sx->early_pipe_ok
2369 | OPTION_CHUNKING | OPTION_PRDR | OPTION_DSN | OPTION_PIPE | OPTION_SIZE
2378 #ifdef SUPPORT_PIPE_CONNECT
2379 if (sx->early_pipe_ok)
2381 sx->ehlo_resp.cleartext_features = sx->peer_offered;
2383 if ( (sx->peer_offered & (OPTION_PIPE | OPTION_EARLY_PIPE))
2384 == (OPTION_PIPE | OPTION_EARLY_PIPE))
2386 DEBUG(D_transport) debug_printf("PIPE_CONNECT usable in future for this IP\n");
2387 sx->ehlo_resp.cleartext_auths = study_ehlo_auths(sx);
2388 write_ehlo_cache_entry(sx);
2394 /* Set tls_offered if the response to EHLO specifies support for STARTTLS. */
2397 smtp_peer_options |= sx->peer_offered & OPTION_TLS;
2402 /* For continuing deliveries down the same channel, having re-exec'd the socket
2403 is the standard input; for a socket held open from verify it is recorded
2404 in the cutthrough context block. Either way we don't need to redo EHLO here
2405 (but may need to do so for TLS - see below).
2406 Set up the pointer to where subsequent commands will be left, for
2407 error messages. Note that smtp_peer_options will have been
2408 set from the command line if they were set in the process that passed the
2411 /*XXX continue case needs to propagate DSN_INFO, prob. in deliver.c
2412 as the continue goes via transport_pass_socket() and doublefork and exec.
2413 It does not wait. Unclear how we keep separate host's responses
2414 separate - we could match up by host ip+port as a bodge. */
2418 if (cutthrough.cctx.sock >= 0 && cutthrough.callout_hold_only)
2420 sx->cctx = cutthrough.cctx;
2421 sx->conn_args.host->port = sx->port = cutthrough.host.port;
2425 sx->cctx.sock = 0; /* stdin */
2426 sx->cctx.tls_ctx = NULL;
2427 smtp_port_for_connect(sx->conn_args.host, sx->port); /* Record the port that was used */
2429 sx->inblock.cctx = sx->outblock.cctx = &sx->cctx;
2430 smtp_command = big_buffer;
2431 sx->helo_data = NULL; /* ensure we re-expand ob->helo_data */
2433 /* For a continued connection with TLS being proxied for us, or a
2434 held-open verify connection with TLS, nothing more to do. */
2436 if ( continue_proxy_cipher
2437 || (cutthrough.cctx.sock >= 0 && cutthrough.callout_hold_only
2438 && cutthrough.is_tls)
2441 sx->peer_offered = smtp_peer_options;
2442 sx->pipelining_used = pipelining_active = !!(smtp_peer_options & OPTION_PIPE);
2443 HDEBUG(D_transport) debug_printf("continued connection, %s TLS\n",
2444 continue_proxy_cipher ? "proxied" : "verify conn with");
2447 HDEBUG(D_transport) debug_printf("continued connection, no TLS\n");
2450 /* If TLS is available on this connection, whether continued or not, attempt to
2451 start up a TLS session, unless the host is in hosts_avoid_tls. If successful,
2452 send another EHLO - the server may give a different answer in secure mode. We
2453 use a separate buffer for reading the response to STARTTLS so that if it is
2454 negative, the original EHLO data is available for subsequent analysis, should
2455 the client not be required to use TLS. If the response is bad, copy the buffer
2456 for error analysis. */
2459 if ( smtp_peer_options & OPTION_TLS
2461 && verify_check_given_host(CUSS &ob->hosts_avoid_tls, sx->conn_args.host) != OK
2463 || verify_check_given_host(CUSS &ob->hosts_verify_avoid_tls, sx->conn_args.host) != OK
2466 uschar buffer2[4096];
2468 if (smtp_write_command(sx, SCMD_FLUSH, "STARTTLS\r\n") < 0)
2471 #ifdef SUPPORT_PIPE_CONNECT
2472 /* If doing early-pipelining reap the banner and EHLO-response but leave
2473 the response for the STARTTLS we just sent alone. */
2475 if (sx->early_pipe_active && sync_responses(sx, 2, 0) != 0)
2478 debug_printf("failed reaping pipelined cmd responses\n");
2479 goto RESPONSE_FAILED;
2483 /* If there is an I/O error, transmission of this message is deferred. If
2484 there is a temporary rejection of STARRTLS and tls_tempfail_tryclear is
2485 false, we also defer. However, if there is a temporary rejection of STARTTLS
2486 and tls_tempfail_tryclear is true, or if there is an outright rejection of
2487 STARTTLS, we carry on. This means we will try to send the message in clear,
2488 unless the host is in hosts_require_tls (tested below). */
2490 if (!smtp_read_response(sx, buffer2, sizeof(buffer2), '2', ob->command_timeout))
2494 || (buffer2[0] == '4' && !ob->tls_tempfail_tryclear)
2497 Ustrncpy(sx->buffer, buffer2, sizeof(sx->buffer));
2498 sx->buffer[sizeof(sx->buffer)-1] = '\0';
2499 goto RESPONSE_FAILED;
2503 /* STARTTLS accepted: try to negotiate a TLS session. */
2508 if (!tls_client_start(&sx->cctx, &sx->conn_args, sx->addrlist, &tls_out, &tls_errstr))
2510 /* TLS negotiation failed; give an error. From outside, this function may
2511 be called again to try in clear on a new connection, if the options permit
2512 it for this host. */
2516 DEBUG(D_tls) debug_printf("TLS session fail: %s\n", tls_errstr);
2518 # ifdef SUPPORT_DANE
2519 if (sx->conn_args.dane)
2521 log_write(0, LOG_MAIN,
2522 "DANE attempt failed; TLS connection to %s [%s]: %s",
2523 sx->conn_args.host->name, sx->conn_args.host->address, tls_errstr);
2524 # ifndef DISABLE_EVENT
2525 (void) event_raise(sx->conn_args.tblock->event_action,
2526 US"dane:fail", US"validation-failure"); /* could do with better detail */
2531 errno = ERRNO_TLSFAILURE;
2532 message = string_sprintf("TLS session: %s", tls_errstr);
2533 sx->send_quit = FALSE;
2537 /* TLS session is set up */
2539 smtp_peer_options_wrap = smtp_peer_options;
2540 for (address_item * addr = sx->addrlist; addr; addr = addr->next)
2541 if (addr->transport_return == PENDING_DEFER)
2543 addr->cipher = tls_out.cipher;
2544 addr->ourcert = tls_out.ourcert;
2545 addr->peercert = tls_out.peercert;
2546 addr->peerdn = tls_out.peerdn;
2547 addr->ocsp = tls_out.ocsp;
2552 /* if smtps, we'll have smtp_command set to something else; always safe to
2554 smtp_command = big_buffer;
2556 /* If we started TLS, redo the EHLO/LHLO exchange over the secure channel. If
2557 helo_data is null, we are dealing with a connection that was passed from
2558 another process, and so we won't have expanded helo_data above. We have to
2559 expand it here. $sending_ip_address and $sending_port are set up right at the
2560 start of the Exim process (in exim.c). */
2562 if (tls_out.active.sock >= 0)
2564 uschar * greeting_cmd;
2566 if (!sx->helo_data && !(sx->helo_data = expand_string(ob->helo_data)))
2568 uschar *message = string_sprintf("failed to expand helo_data: %s",
2569 expand_string_message);
2570 set_errno_nohost(sx->addrlist, ERRNO_EXPANDFAIL, message, DEFER, FALSE);
2575 #ifdef SUPPORT_PIPE_CONNECT
2576 /* For SMTPS there is no cleartext early-pipe; use the crypted permission bit.
2577 We're unlikely to get the group sent and delivered before the server sends its
2578 banner, but it's still worth sending as a group.
2579 For STARTTLS allow for cleartext early-pipe but no crypted early-pipe, but not
2582 if (sx->smtps ? sx->early_pipe_ok : sx->early_pipe_active)
2584 sx->peer_offered = sx->ehlo_resp.crypted_features;
2585 if ((sx->early_pipe_active =
2586 !!(sx->ehlo_resp.crypted_features & OPTION_EARLY_PIPE)))
2587 DEBUG(D_transport) debug_printf("Using cached crypted PIPE_CONNECT\n");
2591 /* For SMTPS we need to wait for the initial OK response. */
2593 #ifdef SUPPORT_PIPE_CONNECT
2594 if (sx->early_pipe_active)
2596 sx->pending_BANNER = TRUE;
2597 sx->outblock.cmd_count = 1;
2601 if (!smtp_reap_banner(sx))
2602 goto RESPONSE_FAILED;
2605 greeting_cmd = US"LHLO";
2607 greeting_cmd = US"EHLO";
2610 greeting_cmd = US"HELO";
2612 debug_printf("not sending EHLO (host matches hosts_avoid_esmtp)\n");
2615 if (smtp_write_command(sx,
2616 #ifdef SUPPORT_PIPE_CONNECT
2617 sx->early_pipe_active ? SCMD_BUFFER :
2620 "%s %s\r\n", greeting_cmd, sx->helo_data) < 0)
2623 #ifdef SUPPORT_PIPE_CONNECT
2624 if (sx->early_pipe_active)
2625 sx->pending_EHLO = TRUE;
2629 if (!smtp_reap_ehlo(sx))
2632 /* The GnuTLS layer in Exim only spots a server-rejection of a client
2633 cert late, under TLS1.3 - which means here; the first time we try to
2634 receive crypted data. Treat it as if it was a connect-time failure.
2635 See also the early-pipe equivalent... which will be hard; every call
2636 to sync_responses will need to check the result.
2637 It would be nicer to have GnuTLS check the cert during the handshake.
2638 Can it do that, with all the flexibility we need? */
2640 tls_errstr = US"error on first read";
2641 goto GNUTLS_CONN_FAILED;
2644 goto RESPONSE_FAILED;
2646 smtp_peer_options = 0;
2650 /* If the host is required to use a secure channel, ensure that we
2654 # ifdef SUPPORT_DANE
2655 || sx->conn_args.dane
2657 || verify_check_given_host(CUSS &ob->hosts_require_tls, sx->conn_args.host) == OK
2660 errno = ERRNO_TLSREQUIRED;
2661 message = string_sprintf("a TLS session is required, but %s",
2662 smtp_peer_options & OPTION_TLS
2663 ? "an attempt to start TLS failed" : "the server did not offer TLS support");
2664 # if defined(SUPPORT_DANE) && !defined(DISABLE_EVENT)
2665 if (sx->conn_args.dane)
2666 (void) event_raise(sx->conn_args.tblock->event_action, US"dane:fail",
2667 smtp_peer_options & OPTION_TLS
2668 ? US"validation-failure" /* could do with better detail */
2669 : US"starttls-not-supported");
2673 #endif /*DISABLE_TLS*/
2675 /* If TLS is active, we have just started it up and re-done the EHLO command,
2676 so its response needs to be analyzed. If TLS is not active and this is a
2677 continued session down a previously-used socket, we haven't just done EHLO, so
2680 if (continue_hostname == NULL
2682 || tls_out.active.sock >= 0
2686 if (sx->esmtp || sx->lmtp)
2688 #ifdef SUPPORT_PIPE_CONNECT
2689 if (!sx->early_pipe_active)
2692 sx->peer_offered = ehlo_response(sx->buffer,
2694 #ifdef SUPPORT_PIPE_CONNECT
2695 | (sx->lmtp && ob->lmtp_ignore_quota ? OPTION_IGNQ : 0)
2696 | OPTION_DSN | OPTION_PIPE | OPTION_SIZE
2697 | OPTION_CHUNKING | OPTION_PRDR | OPTION_UTF8
2698 | (tls_out.active.sock >= 0 ? OPTION_EARLY_PIPE : 0) /* not for lmtp */
2702 | (sx->lmtp && ob->lmtp_ignore_quota ? OPTION_IGNQ : 0)
2705 # ifdef SUPPORT_I18N
2706 | (sx->addrlist->prop.utf8_msg ? OPTION_UTF8 : 0)
2707 /*XXX if we hand peercaps on to continued-conn processes,
2708 must not depend on this addr */
2712 | (ob->size_addition >= 0 ? OPTION_SIZE : 0)
2715 #ifdef SUPPORT_PIPE_CONNECT
2716 if (tls_out.active.sock >= 0)
2717 sx->ehlo_resp.crypted_features = sx->peer_offered;
2721 /* Set for IGNOREQUOTA if the response to LHLO specifies support and the
2722 lmtp_ignore_quota option was set. */
2724 sx->igquotstr = sx->peer_offered & OPTION_IGNQ ? US" IGNOREQUOTA" : US"";
2726 /* If the response to EHLO specified support for the SIZE parameter, note
2727 this, provided size_addition is non-negative. */
2729 smtp_peer_options |= sx->peer_offered & OPTION_SIZE;
2731 /* Note whether the server supports PIPELINING. If hosts_avoid_esmtp matched
2732 the current host, esmtp will be false, so PIPELINING can never be used. If
2733 the current host matches hosts_avoid_pipelining, don't do it. */
2735 if ( sx->peer_offered & OPTION_PIPE
2736 && verify_check_given_host(CUSS &ob->hosts_avoid_pipelining, sx->conn_args.host) != OK)
2737 smtp_peer_options |= OPTION_PIPE;
2739 DEBUG(D_transport) debug_printf("%susing PIPELINING\n",
2740 smtp_peer_options & OPTION_PIPE ? "" : "not ");
2742 if ( sx->peer_offered & OPTION_CHUNKING
2743 && verify_check_given_host(CUSS &ob->hosts_try_chunking, sx->conn_args.host) != OK)
2744 sx->peer_offered &= ~OPTION_CHUNKING;
2746 if (sx->peer_offered & OPTION_CHUNKING)
2747 DEBUG(D_transport) debug_printf("CHUNKING usable\n");
2749 #ifndef DISABLE_PRDR
2750 if ( sx->peer_offered & OPTION_PRDR
2751 && verify_check_given_host(CUSS &ob->hosts_try_prdr, sx->conn_args.host) != OK)
2752 sx->peer_offered &= ~OPTION_PRDR;
2754 if (sx->peer_offered & OPTION_PRDR)
2755 DEBUG(D_transport) debug_printf("PRDR usable\n");
2758 /* Note if the server supports DSN */
2759 smtp_peer_options |= sx->peer_offered & OPTION_DSN;
2760 DEBUG(D_transport) debug_printf("%susing DSN\n",
2761 sx->peer_offered & OPTION_DSN ? "" : "not ");
2763 #ifdef SUPPORT_PIPE_CONNECT
2764 if ( sx->early_pipe_ok
2765 && !sx->early_pipe_active
2766 && tls_out.active.sock >= 0
2767 && smtp_peer_options & OPTION_PIPE
2768 && ( sx->ehlo_resp.cleartext_features | sx->ehlo_resp.crypted_features)
2769 & OPTION_EARLY_PIPE)
2771 DEBUG(D_transport) debug_printf("PIPE_CONNECT usable in future for this IP\n");
2772 sx->ehlo_resp.crypted_auths = study_ehlo_auths(sx);
2773 write_ehlo_cache_entry(sx);
2777 /* Note if the response to EHLO specifies support for the AUTH extension.
2778 If it has, check that this host is one we want to authenticate to, and do
2779 the business. The host name and address must be available when the
2780 authenticator's client driver is running. */
2782 switch (yield = smtp_auth(sx))
2784 default: goto SEND_QUIT;
2786 case FAIL_SEND: goto SEND_FAILED;
2787 case FAIL: goto RESPONSE_FAILED;
2791 sx->pipelining_used = pipelining_active = !!(smtp_peer_options & OPTION_PIPE);
2793 /* The setting up of the SMTP call is now complete. Any subsequent errors are
2794 message-specific. */
2796 sx->setting_up = FALSE;
2799 if (sx->addrlist->prop.utf8_msg)
2803 /* If the transport sets a downconversion mode it overrides any set by ACL
2806 if ((s = ob->utf8_downconvert))
2808 if (!(s = expand_string(s)))
2810 message = string_sprintf("failed to expand utf8_downconvert: %s",
2811 expand_string_message);
2812 set_errno_nohost(sx->addrlist, ERRNO_EXPANDFAIL, message, DEFER, FALSE);
2818 case '1': sx->addrlist->prop.utf8_downcvt = TRUE;
2819 sx->addrlist->prop.utf8_downcvt_maybe = FALSE;
2821 case '0': sx->addrlist->prop.utf8_downcvt = FALSE;
2822 sx->addrlist->prop.utf8_downcvt_maybe = FALSE;
2824 case '-': if (s[1] == '1')
2826 sx->addrlist->prop.utf8_downcvt = FALSE;
2827 sx->addrlist->prop.utf8_downcvt_maybe = TRUE;
2833 sx->utf8_needed = !sx->addrlist->prop.utf8_downcvt
2834 && !sx->addrlist->prop.utf8_downcvt_maybe;
2835 DEBUG(D_transport) if (!sx->utf8_needed)
2836 debug_printf("utf8: %s downconvert\n",
2837 sx->addrlist->prop.utf8_downcvt ? "mandatory" : "optional");
2840 /* If this is an international message we need the host to speak SMTPUTF8 */
2841 if (sx->utf8_needed && !(sx->peer_offered & OPTION_UTF8))
2843 errno = ERRNO_UTF8_FWD;
2844 goto RESPONSE_FAILED;
2846 #endif /*SUPPORT_I18N*/
2855 if (errno == ECONNREFUSED) /* first-read error on a TFO conn */
2857 /* There is a testing facility for simulating a connection timeout, as I
2858 can't think of any other way of doing this. It converts a connection
2859 refused into a timeout if the timeout is set to 999999. This is done for
2860 a 3whs connection in ip_connect(), but a TFO connection does not error
2861 there - instead it gets ECONNREFUSED on the first data read. Tracking
2862 that a TFO really was done is too hard, or we would set a
2863 sx->pending_conn_done bit and test that in smtp_reap_banner() and
2864 smtp_reap_ehlo(). That would let us also add the conn-timeout to the
2867 if (f.running_in_test_harness && ob->connect_timeout == 999999)
2869 set_errno_nohost(sx->addrlist,
2870 errno == ETIMEDOUT ? ERRNO_CONNECTTIMEOUT : errno,
2871 sx->verify ? US strerror(errno) : NULL,
2873 sx->send_quit = FALSE;
2877 /* really an error on an SMTP read */
2879 sx->send_quit = check_response(sx->conn_args.host, &errno, sx->addrlist->more_errno,
2880 sx->buffer, &code, &message, &pass_message);
2886 message = US string_sprintf("send() to %s [%s] failed: %s",
2887 sx->conn_args.host->name, sx->conn_args.host->address, strerror(errno));
2888 sx->send_quit = FALSE;
2894 message = string_sprintf("Remote host closed connection in response to %s"
2895 " (EHLO response was: %s)", smtp_command, sx->buffer);
2896 sx->send_quit = FALSE;
2900 /* This label is jumped to directly when a TLS negotiation has failed,
2901 or was not done for a host for which it is required. Values will be set
2902 in message and errno, and setting_up will always be true. Treat as
2903 a temporary error. */
2907 code = '4', yield = DEFER;
2911 /* The failure happened while setting up the call; see if the failure was
2912 a 5xx response (this will either be on connection, or following HELO - a 5xx
2913 after EHLO causes it to try HELO). If so, and there are no more hosts to try,
2914 fail all addresses, as this host is never going to accept them. For other
2915 errors during setting up (timeouts or whatever), defer all addresses, and
2916 yield DEFER, so that the host is not tried again for a while.
2918 XXX This peeking for another host feels like a layering violation. We want
2919 to note the host as unusable, but down here we shouldn't know if this was
2920 the last host to try for the addr(list). Perhaps the upper layer should be
2921 the one to do set_errno() ? The problem is that currently the addr is where
2922 errno etc. are stashed, but until we run out of hosts to try the errors are
2923 host-specific. Maybe we should enhance the host_item definition? */
2926 sx->ok = FALSE; /* For when reached by GOTO */
2927 set_errno(sx->addrlist, errno, message,
2928 sx->conn_args.host->next
2932 || errno == ERRNO_UTF8_FWD
2936 errno == ECONNREFUSED ? NULL : sx->conn_args.host
2937 #ifdef EXPERIMENTAL_DSN_INFO
2938 , sx->smtp_greeting, sx->helo_response
2947 (void)smtp_write_command(sx, SCMD_FLUSH, "QUIT\r\n");
2950 if (sx->cctx.tls_ctx)
2952 tls_close(sx->cctx.tls_ctx, TLS_SHUTDOWN_NOWAIT);
2953 sx->cctx.tls_ctx = NULL;
2957 /* Close the socket, and return the appropriate value, first setting
2958 works because the NULL setting is passed back to the calling process, and
2959 remote_max_parallel is forced to 1 when delivering over an existing connection,
2962 HDEBUG(D_transport|D_acl|D_v) debug_printf_indent(" SMTP(close)>>\n");
2965 shutdown(sx->cctx.sock, SHUT_WR);
2966 if (fcntl(sx->cctx.sock, F_SETFL, O_NONBLOCK) == 0)
2967 for (int i = 16; read(sx->cctx.sock, sx->inbuffer, sizeof(sx->inbuffer)) > 0 && i > 0;)
2968 i--; /* drain socket */
2969 sx->send_quit = FALSE;
2971 (void)close(sx->cctx.sock);
2974 #ifndef DISABLE_EVENT
2975 (void) event_raise(sx->conn_args.tblock->event_action, US"tcp:close", NULL);
2978 continue_transport = NULL;
2979 continue_hostname = NULL;
2986 /* Create the string of options that will be appended to the MAIL FROM:
2987 in the connection context buffer */
2990 build_mailcmd_options(smtp_context * sx, address_item * addrlist)
2992 uschar * p = sx->buffer;
2993 address_item * addr;
2998 /* If we know the receiving MTA supports the SIZE qualification, and we know it,
2999 send it, adding something to the message size to allow for imprecision
3000 and things that get added en route. Exim keeps the number of lines
3001 in a message, so we can give an accurate value for the original message, but we
3002 need some additional to handle added headers. (Double "." characters don't get
3003 included in the count.) */
3005 if ( message_size > 0
3006 && sx->peer_offered & OPTION_SIZE && !(sx->avoid_option & OPTION_SIZE))
3008 /*XXX problem here under spool_files_wireformat?
3009 Or just forget about lines? Or inflate by a fixed proportion? */
3011 sprintf(CS p, " SIZE=%d", message_size+message_linecount+(SOB sx->conn_args.ob)->size_addition);
3015 #ifndef DISABLE_PRDR
3016 /* If it supports Per-Recipient Data Responses, and we have more than one recipient,
3019 sx->prdr_active = FALSE;
3020 if (sx->peer_offered & OPTION_PRDR)
3021 for (address_item * addr = addrlist; addr; addr = addr->next)
3022 if (addr->transport_return == PENDING_DEFER)
3024 for (addr = addr->next; addr; addr = addr->next)
3025 if (addr->transport_return == PENDING_DEFER)
3026 { /* at least two recipients to send */
3027 sx->prdr_active = TRUE;
3028 sprintf(CS p, " PRDR"); p += 5;
3036 /* If it supports internationalised messages, and this meesage need that,
3039 if ( sx->peer_offered & OPTION_UTF8
3040 && addrlist->prop.utf8_msg
3041 && !addrlist->prop.utf8_downcvt
3043 Ustrcpy(p, " SMTPUTF8"), p += 9;
3046 /* check if all addresses have DSN-lasthop flag; do not send RET and ENVID if so */
3047 for (sx->dsn_all_lasthop = TRUE, addr = addrlist, address_count = 0;
3048 addr && address_count < sx->max_rcpt;
3049 addr = addr->next) if (addr->transport_return == PENDING_DEFER)
3052 if (!(addr->dsn_flags & rf_dsnlasthop))
3054 sx->dsn_all_lasthop = FALSE;
3059 /* Add any DSN flags to the mail command */
3061 if (sx->peer_offered & OPTION_DSN && !sx->dsn_all_lasthop)
3063 if (dsn_ret == dsn_ret_hdrs)
3064 { Ustrcpy(p, " RET=HDRS"); p += 9; }
3065 else if (dsn_ret == dsn_ret_full)
3066 { Ustrcpy(p, " RET=FULL"); p += 9; }
3070 string_format(p, sizeof(sx->buffer) - (p-sx->buffer), " ENVID=%s", dsn_envid);
3075 /* If an authenticated_sender override has been specified for this transport
3076 instance, expand it. If the expansion is forced to fail, and there was already
3077 an authenticated_sender for this message, the original value will be used.
3078 Other expansion failures are serious. An empty result is ignored, but there is
3079 otherwise no check - this feature is expected to be used with LMTP and other
3080 cases where non-standard addresses (e.g. without domains) might be required. */
3082 if (smtp_mail_auth_str(p, sizeof(sx->buffer) - (p-sx->buffer), addrlist, sx->conn_args.ob))
3090 build_rcptcmd_options(smtp_context * sx, const address_item * addr)
3092 uschar * p = sx->buffer;
3095 /* Add any DSN flags to the rcpt command */
3097 if (sx->peer_offered & OPTION_DSN && !(addr->dsn_flags & rf_dsnlasthop))
3099 if (addr->dsn_flags & rf_dsnflags)
3103 Ustrcpy(p, " NOTIFY=");
3105 for (int i = 0; i < nelem(rf_list); i++) if (addr->dsn_flags & rf_list[i])
3107 if (!first) *p++ = ',';
3109 Ustrcpy(p, rf_names[i]);
3114 if (addr->dsn_orcpt)
3116 string_format(p, sizeof(sx->buffer) - (p-sx->buffer), " ORCPT=%s",
3127 0 good, rcpt results in addr->transport_return (PENDING_OK, DEFER, FAIL)
3128 -1 MAIL response error
3129 -2 any non-MAIL read i/o error
3130 -3 non-MAIL response timeout
3131 -4 internal error; channel still usable
3136 smtp_write_mail_and_rcpt_cmds(smtp_context * sx, int * yield)
3138 address_item * addr;
3142 if (build_mailcmd_options(sx, sx->first_addr) != OK)
3148 /* From here until we send the DATA command, we can make use of PIPELINING
3149 if the server host supports it. The code has to be able to check the responses
3150 at any point, for when the buffer fills up, so we write it totally generally.
3151 When PIPELINING is off, each command written reports that it has flushed the
3154 sx->pending_MAIL = TRUE; /* The block starts with MAIL */
3157 uschar * s = sx->from_addr;
3159 uschar * errstr = NULL;
3161 /* If we must downconvert, do the from-address here. Remember we had to
3162 for the to-addresses (done below), and also (ugly) for re-doing when building
3163 the delivery log line. */
3165 if ( sx->addrlist->prop.utf8_msg
3166 && (sx->addrlist->prop.utf8_downcvt || !(sx->peer_offered & OPTION_UTF8))
3169 if (s = string_address_utf8_to_alabel(s, &errstr), errstr)
3171 set_errno_nohost(sx->addrlist, ERRNO_EXPANDFAIL, errstr, DEFER, FALSE);
3175 setflag(sx->addrlist, af_utf8_downcvt);
3179 rc = smtp_write_command(sx, pipelining_active ? SCMD_BUFFER : SCMD_FLUSH,
3180 "MAIL FROM:<%s>%s\r\n", s, sx->buffer);
3183 mail_command = string_copy(big_buffer); /* Save for later error message */
3187 case -1: /* Transmission error */
3190 case +1: /* Cmd was sent */
3191 if (!smtp_read_response(sx, sx->buffer, sizeof(sx->buffer), '2',
3192 (SOB sx->conn_args.ob)->command_timeout))
3194 if (errno == 0 && sx->buffer[0] == '4')
3196 errno = ERRNO_MAIL4XX;
3197 sx->addrlist->more_errno |= ((sx->buffer[1] - '0')*10 + sx->buffer[2] - '0') << 8;
3201 sx->pending_MAIL = FALSE;
3204 /* otherwise zero: command queued for pipeline */
3207 /* Pass over all the relevant recipient addresses for this host, which are the
3208 ones that have status PENDING_DEFER. If we are using PIPELINING, we can send
3209 several before we have to read the responses for those seen so far. This
3210 checking is done by a subroutine because it also needs to be done at the end.
3211 Send only up to max_rcpt addresses at a time, leaving next_addr pointing to
3212 the next one if not all are sent.
3214 In the MUA wrapper situation, we want to flush the PIPELINING buffer for the
3215 last address because we want to abort if any recipients have any kind of
3216 problem, temporary or permanent. We know that all recipient addresses will have
3217 the PENDING_DEFER status, because only one attempt is ever made, and we know
3218 that max_rcpt will be large, so all addresses will be done at once.
3220 For verify we flush the pipeline after any (the only) rcpt address. */
3222 for (addr = sx->first_addr, address_count = 0;
3223 addr && address_count < sx->max_rcpt;
3224 addr = addr->next) if (addr->transport_return == PENDING_DEFER)
3230 addr->dsn_aware = sx->peer_offered & OPTION_DSN
3231 ? dsn_support_yes : dsn_support_no;
3234 no_flush = pipelining_active && !sx->verify
3235 && (!mua_wrapper || addr->next && address_count < sx->max_rcpt);
3237 build_rcptcmd_options(sx, addr);
3239 /* Now send the RCPT command, and process outstanding responses when
3240 necessary. After a timeout on RCPT, we just end the function, leaving the
3241 yield as OK, because this error can often mean that there is a problem with
3242 just one address, so we don't want to delay the host. */
3244 rcpt_addr = transport_rcpt_address(addr, sx->conn_args.tblock->rcpt_include_affixes);
3247 if ( testflag(sx->addrlist, af_utf8_downcvt)
3248 && !(rcpt_addr = string_address_utf8_to_alabel(rcpt_addr, NULL))
3251 /*XXX could we use a per-address errstr here? Not fail the whole send? */
3252 errno = ERRNO_EXPANDFAIL;
3253 return -5; /*XXX too harsh? */
3257 count = smtp_write_command(sx, no_flush ? SCMD_BUFFER : SCMD_FLUSH,
3258 "RCPT TO:<%s>%s%s\r\n", rcpt_addr, sx->igquotstr, sx->buffer);
3260 if (count < 0) return -5;
3263 switch(sync_responses(sx, count, 0))
3265 case 3: sx->ok = TRUE; /* 2xx & 5xx => OK & progress made */
3266 case 2: sx->completed_addr = TRUE; /* 5xx (only) => progress made */
3269 case 1: sx->ok = TRUE; /* 2xx (only) => OK, but if LMTP, */
3270 if (!sx->lmtp) /* can't tell about progress yet */
3271 sx->completed_addr = TRUE;
3272 case 0: /* No 2xx or 5xx, but no probs */
3275 case -1: return -3; /* Timeout on RCPT */
3276 case -2: return -2; /* non-MAIL read i/o error */
3277 default: return -1; /* any MAIL error */
3279 #ifdef SUPPORT_PIPE_CONNECT
3280 case -4: return -1; /* non-2xx for pipelined banner or EHLO */
3281 case -5: return -1; /* TLS first-read error */
3284 sx->pending_MAIL = FALSE; /* Dealt with MAIL */
3286 } /* Loop for next address */
3288 sx->next_addr = addr;
3294 /*****************************************************
3295 * Proxy TLS connection for another transport process *
3296 ******************************************************/
3298 Close the unused end of the pipe, fork once more, then use the given buffer
3299 as a staging area, and select on both the given fd and the TLS'd client-fd for
3300 data to read (per the coding in ip_recv() and fd_ready() this is legitimate).
3301 Do blocking full-size writes, and reads under a timeout. Once both input
3302 channels are closed, exit the process.
3306 buf space to use for buffering
3307 bufsiz size of buffer
3308 pfd pipe filedescriptor array; [0] is comms to proxied process
3309 timeout per-read timeout, seconds
3315 smtp_proxy_tls(void * ct_ctx, uschar * buf, size_t bsize, int * pfd,
3319 int max_fd = MAX(pfd[0], tls_out.active.sock) + 1;
3325 DEBUG(D_transport) debug_printf("proxy-proc final-pid %d\n", rc);
3326 _exit(rc < 0 ? EXIT_FAILURE : EXIT_SUCCESS);
3329 if (f.running_in_test_harness) millisleep(100); /* let parent debug out */
3330 set_process_info("proxying TLS connection for continued transport");
3332 FD_SET(tls_out.active.sock, &rfds);
3333 FD_SET(pfd[0], &rfds);
3335 for (int fd_bits = 3; fd_bits; )
3337 time_t time_left = timeout;
3338 time_t time_start = time(NULL);
3344 struct timeval tv = { time_left, 0 };
3347 (SELECT_ARG2_TYPE *)&rfds, NULL, (SELECT_ARG2_TYPE *)&efds, &tv);
3349 if (rc < 0 && errno == EINTR)
3350 if ((time_left -= time(NULL) - time_start) > 0) continue;
3354 DEBUG(D_transport) if (rc == 0) debug_printf("%s: timed out\n", __FUNCTION__);
3358 if (FD_ISSET(tls_out.active.sock, &efds) || FD_ISSET(pfd[0], &efds))
3360 DEBUG(D_transport) debug_printf("select: exceptional cond on %s fd\n",
3361 FD_ISSET(pfd[0], &efds) ? "proxy" : "tls");
3365 while (rc < 0 || !(FD_ISSET(tls_out.active.sock, &rfds) || FD_ISSET(pfd[0], &rfds)));
3367 /* handle inbound data */
3368 if (FD_ISSET(tls_out.active.sock, &rfds))
3369 if ((rc = tls_read(ct_ctx, buf, bsize)) <= 0)
3372 FD_CLR(tls_out.active.sock, &rfds);
3373 shutdown(pfd[0], SHUT_WR);
3378 for (int nbytes = 0; rc - nbytes > 0; nbytes += i)
3379 if ((i = write(pfd[0], buf + nbytes, rc - nbytes)) < 0) goto done;
3381 else if (fd_bits & 1)
3382 FD_SET(tls_out.active.sock, &rfds);
3384 /* handle outbound data */
3385 if (FD_ISSET(pfd[0], &rfds))
3386 if ((rc = read(pfd[0], buf, bsize)) <= 0)
3389 tls_close(ct_ctx, TLS_SHUTDOWN_NOWAIT);
3394 for (int nbytes = 0; rc - nbytes > 0; nbytes += i)
3395 if ((i = tls_write(ct_ctx, buf + nbytes, rc - nbytes, FALSE)) < 0)
3398 else if (fd_bits & 2)
3399 FD_SET(pfd[0], &rfds);
3403 if (f.running_in_test_harness) millisleep(100); /* let logging complete */
3404 exim_exit(0, US"TLS proxy");
3409 /*************************************************
3410 * Deliver address list to given host *
3411 *************************************************/
3413 /* If continue_hostname is not null, we get here only when continuing to
3414 deliver down an existing channel. The channel was passed as the standard
3415 input. TLS is never active on a passed channel; the previous process always
3416 closes it down before passing the connection on.
3418 Otherwise, we have to make a connection to the remote host, and do the
3419 initial protocol exchange.
3421 When running as an MUA wrapper, if the sender or any recipient is rejected,
3422 temporarily or permanently, we force failure for all recipients.
3425 addrlist chain of potential addresses to deliver; only those whose
3426 transport_return field is set to PENDING_DEFER are currently
3427 being processed; others should be skipped - they have either
3428 been delivered to an earlier host or IP address, or been
3429 failed by one of them.
3430 host host to deliver to
3431 host_af AF_INET or AF_INET6
3432 defport default TCP/IP port to use if host does not specify, in host
3434 interface interface to bind to, or NULL
3435 tblock transport instance block
3436 message_defer set TRUE if yield is OK, but all addresses were deferred
3437 because of a non-recipient, non-host failure, that is, a
3438 4xx response to MAIL FROM, DATA, or ".". This is a defer
3439 that is specific to the message.
3440 suppress_tls if TRUE, don't attempt a TLS connection - this is set for
3441 a second attempt after TLS initialization fails
3443 Returns: OK - the connection was made and the delivery attempted;
3444 the result for each address is in its data block.
3445 DEFER - the connection could not be made, or something failed
3446 while setting up the SMTP session, or there was a
3447 non-message-specific error, such as a timeout.
3448 ERROR - a filter command is specified for this transport,
3449 and there was a problem setting it up; OR helo_data
3450 or add_headers or authenticated_sender is specified
3451 for this transport, and the string failed to expand
3455 smtp_deliver(address_item *addrlist, host_item *host, int host_af, int defport,
3456 uschar *interface, transport_instance *tblock,
3457 BOOL *message_defer, BOOL suppress_tls)
3459 smtp_transport_options_block * ob = SOB tblock->options_block;
3463 struct timeval start_delivery_time;
3465 BOOL pass_message = FALSE;
3466 uschar *message = NULL;
3467 uschar new_message_id[MESSAGE_ID_LENGTH + 1];
3471 gettimeofday(&start_delivery_time, NULL);
3472 suppress_tls = suppress_tls; /* stop compiler warning when no TLS support */
3473 *message_defer = FALSE;
3475 sx.addrlist = addrlist;
3476 sx.conn_args.host = host;
3477 sx.conn_args.host_af = host_af,
3479 sx.conn_args.interface = interface;
3480 sx.helo_data = NULL;
3481 sx.conn_args.tblock = tblock;
3483 sx.sync_addr = sx.first_addr = addrlist;
3485 /* Get the channel set up ready for a message (MAIL FROM being the next
3486 SMTP command to send */
3488 if ((rc = smtp_setup_conn(&sx, suppress_tls)) != OK)
3491 /* If there is a filter command specified for this transport, we can now
3492 set it up. This cannot be done until the identify of the host is known. */
3494 if (tblock->filter_command)
3496 transport_filter_timeout = tblock->filter_timeout;
3498 /* On failure, copy the error to all addresses, abandon the SMTP call, and
3501 if (!transport_set_up_command(&transport_filter_argv,
3502 tblock->filter_command, TRUE, DEFER, addrlist,
3503 string_sprintf("%.50s transport", tblock->name), NULL))
3505 set_errno_nohost(addrlist->next, addrlist->basic_errno, addrlist->message, DEFER,
3511 if ( transport_filter_argv
3512 && *transport_filter_argv
3513 && **transport_filter_argv
3514 && sx.peer_offered & OPTION_CHUNKING
3517 sx.peer_offered &= ~OPTION_CHUNKING;
3518 DEBUG(D_transport) debug_printf("CHUNKING not usable due to transport filter\n");
3522 /* For messages that have more than the maximum number of envelope recipients,
3523 we want to send several transactions down the same SMTP connection. (See
3524 comments in deliver.c as to how this reconciles, heuristically, with
3525 remote_max_parallel.) This optimization was added to Exim after the following
3526 code was already working. The simplest way to put it in without disturbing the
3527 code was to use a goto to jump back to this point when there is another
3528 transaction to handle. */
3531 sx.from_addr = return_path;
3532 sx.sync_addr = sx.first_addr;
3534 sx.send_rset = TRUE;
3535 sx.completed_addr = FALSE;
3538 /* If we are a continued-connection-after-verify the MAIL and RCPT
3539 commands were already sent; do not re-send but do mark the addrs as
3540 having been accepted up to RCPT stage. A traditional cont-conn
3541 always has a sequence number greater than one. */
3543 if (continue_hostname && continue_sequence == 1)
3545 sx.peer_offered = smtp_peer_options;
3546 sx.pending_MAIL = FALSE;
3548 sx.next_addr = NULL;
3550 for (address_item * addr = addrlist; addr; addr = addr->next)
3551 addr->transport_return = PENDING_OK;
3555 /* Initiate a message transfer. */
3557 switch(smtp_write_mail_and_rcpt_cmds(&sx, &yield))
3560 case -1: case -2: goto RESPONSE_FAILED;
3561 case -3: goto END_OFF;
3562 case -4: goto SEND_QUIT;
3563 default: goto SEND_FAILED;
3566 /* If we are an MUA wrapper, abort if any RCPTs were rejected, either
3567 permanently or temporarily. We should have flushed and synced after the last
3575 for (a = sx.first_addr, cnt = 0; a && cnt < sx.max_rcpt; a = a->next, cnt++)
3576 if (a->transport_return != PENDING_OK)
3578 /*XXX could we find a better errno than 0 here? */
3579 set_errno_nohost(addrlist, 0, a->message, FAIL,
3580 testflag(a, af_pass_message));
3587 /* If ok is TRUE, we know we have got at least one good recipient, and must now
3588 send DATA, but if it is FALSE (in the normal, non-wrapper case), we may still
3589 have a good recipient buffered up if we are pipelining. We don't want to waste
3590 time sending DATA needlessly, so we only send it if either ok is TRUE or if we
3591 are pipelining. The responses are all handled by sync_responses().
3592 If using CHUNKING, do not send a BDAT until we know how big a chunk we want
3595 if ( !(sx.peer_offered & OPTION_CHUNKING)
3596 && (sx.ok || (pipelining_active && !mua_wrapper)))
3598 int count = smtp_write_command(&sx, SCMD_FLUSH, "DATA\r\n");
3600 if (count < 0) goto SEND_FAILED;
3601 switch(sync_responses(&sx, count, sx.ok ? +1 : -1))
3603 case 3: sx.ok = TRUE; /* 2xx & 5xx => OK & progress made */
3604 case 2: sx.completed_addr = TRUE; /* 5xx (only) => progress made */
3607 case 1: sx.ok = TRUE; /* 2xx (only) => OK, but if LMTP, */
3608 if (!sx.lmtp) sx.completed_addr = TRUE; /* can't tell about progress yet */
3609 case 0: break; /* No 2xx or 5xx, but no probs */
3611 case -1: goto END_OFF; /* Timeout on RCPT */
3613 #ifdef SUPPORT_PIPE_CONNECT
3614 case -5: /* TLS first-read error */
3615 case -4: HDEBUG(D_transport)
3616 debug_printf("failed reaping pipelined cmd responses\n");
3618 default: goto RESPONSE_FAILED; /* I/O error, or any MAIL/DATA error */
3620 pipelining_active = FALSE;
3621 data_command = string_copy(big_buffer); /* Save for later error message */
3624 /* If there were no good recipients (but otherwise there have been no
3625 problems), just set ok TRUE, since we have handled address-specific errors
3626 already. Otherwise, it's OK to send the message. Use the check/escape mechanism
3627 for handling the SMTP dot-handling protocol, flagging to apply to headers as
3628 well as body. Set the appropriate timeout value to be used for each chunk.
3629 (Haven't been able to make it work using select() for writing yet.) */
3631 if (!(sx.peer_offered & OPTION_CHUNKING) && !sx.ok)
3633 /* Save the first address of the next batch. */
3634 sx.first_addr = sx.next_addr;
3640 transport_ctx tctx = {
3641 .u = {.fd = sx.cctx.sock}, /*XXX will this need TLS info? */
3644 .check_string = US".",
3645 .escape_string = US"..", /* Escaping strings */
3647 topt_use_crlf | topt_escape_headers
3648 | (tblock->body_only ? topt_no_headers : 0)
3649 | (tblock->headers_only ? topt_no_body : 0)
3650 | (tblock->return_path_add ? topt_add_return_path : 0)
3651 | (tblock->delivery_date_add ? topt_add_delivery_date : 0)
3652 | (tblock->envelope_to_add ? topt_add_envelope_to : 0)
3655 /* If using CHUNKING we need a callback from the generic transport
3656 support to us, for the sending of BDAT smtp commands and the reaping
3657 of responses. The callback needs a whole bunch of state so set up
3658 a transport-context structure to be passed around. */
3660 if (sx.peer_offered & OPTION_CHUNKING)
3662 tctx.check_string = tctx.escape_string = NULL;
3663 tctx.options |= topt_use_bdat;
3664 tctx.chunk_cb = smtp_chunk_cmd_callback;
3665 sx.pending_BDAT = FALSE;
3666 sx.good_RCPT = sx.ok;
3668 tctx.smtp_context = &sx;
3671 tctx.options |= topt_end_dot;
3673 /* Save the first address of the next batch. */
3674 sx.first_addr = sx.next_addr;
3676 /* Responses from CHUNKING commands go in buffer. Otherwise,
3677 there has not been a response. */
3681 sigalrm_seen = FALSE;
3682 transport_write_timeout = ob->data_timeout;
3683 smtp_command = US"sending data block"; /* For error messages */
3684 DEBUG(D_transport|D_v)
3685 if (sx.peer_offered & OPTION_CHUNKING)
3686 debug_printf(" will write message using CHUNKING\n");
3688 debug_printf(" SMTP>> writing message and terminating \".\"\n");
3689 transport_count = 0;
3691 #ifndef DISABLE_DKIM
3692 dkim_exim_sign_init();
3693 # ifdef EXPERIMENTAL_ARC
3695 uschar * s = ob->arc_sign;
3698 if (!(ob->dkim.arc_signspec = s = expand_string(s)))
3700 if (!f.expand_string_forcedfail)
3702 message = US"failed to expand arc_sign";
3709 /* Ask dkim code to hash the body for ARC */
3710 (void) arc_ams_setup_sign_bodyhash();
3711 ob->dkim.force_bodyhash = TRUE;
3716 sx.ok = dkim_transport_write_message(&tctx, &ob->dkim, CUSS &message);
3718 sx.ok = transport_write_message(&tctx, 0);
3721 /* transport_write_message() uses write() because it is called from other
3722 places to write to non-sockets. This means that under some OS (e.g. Solaris)
3723 it can exit with "Broken pipe" as its error. This really means that the
3724 socket got closed at the far end. */
3726 transport_write_timeout = 0; /* for subsequent transports */
3728 /* Failure can either be some kind of I/O disaster (including timeout),
3729 or the failure of a transport filter or the expansion of added headers.
3730 Or, when CHUNKING, it can be a protocol-detected failure. */
3733 if (message) goto SEND_FAILED;
3734 else goto RESPONSE_FAILED;
3736 /* We used to send the terminating "." explicitly here, but because of
3737 buffering effects at both ends of TCP/IP connections, you don't gain
3738 anything by keeping it separate, so it might as well go in the final
3739 data buffer for efficiency. This is now done by setting the topt_end_dot
3742 smtp_command = US"end of data";
3744 if (sx.peer_offered & OPTION_CHUNKING && sx.cmd_count > 1)
3746 /* Reap any outstanding MAIL & RCPT commands, but not a DATA-go-ahead */
3747 switch(sync_responses(&sx, sx.cmd_count-1, 0))
3749 case 3: sx.ok = TRUE; /* 2xx & 5xx => OK & progress made */
3750 case 2: sx.completed_addr = TRUE; /* 5xx (only) => progress made */
3753 case 1: sx.ok = TRUE; /* 2xx (only) => OK, but if LMTP, */
3754 if (!sx.lmtp) sx.completed_addr = TRUE; /* can't tell about progress yet */
3755 case 0: break; /* No 2xx or 5xx, but no probs */
3757 case -1: goto END_OFF; /* Timeout on RCPT */
3759 #ifdef SUPPORT_PIPE_CONNECT
3760 case -5: /* TLS first-read error */
3761 case -4: HDEBUG(D_transport)
3762 debug_printf("failed reaping pipelined cmd responses\n");
3764 default: goto RESPONSE_FAILED; /* I/O error, or any MAIL/DATA error */
3768 #ifndef DISABLE_PRDR
3769 /* For PRDR we optionally get a partial-responses warning followed by the
3770 individual responses, before going on with the overall response. If we don't
3771 get the warning then deal with per non-PRDR. */
3775 sx.ok = smtp_read_response(&sx, sx.buffer, sizeof(sx.buffer), '3', ob->final_timeout);
3776 if (!sx.ok && errno == 0) switch(sx.buffer[0])
3778 case '2': sx.prdr_active = FALSE;
3781 case '4': errno = ERRNO_DATA4XX;
3782 addrlist->more_errno |=
3783 ((sx.buffer[1] - '0')*10 + sx.buffer[2] - '0') << 8;
3790 /* For non-PRDR SMTP, we now read a single response that applies to the
3791 whole message. If it is OK, then all the addresses have been delivered. */
3795 sx.ok = smtp_read_response(&sx, sx.buffer, sizeof(sx.buffer), '2',
3797 if (!sx.ok && errno == 0 && sx.buffer[0] == '4')
3799 errno = ERRNO_DATA4XX;
3800 addrlist->more_errno |= ((sx.buffer[1] - '0')*10 + sx.buffer[2] - '0') << 8;
3804 /* For LMTP, we get back a response for every RCPT command that we sent;
3805 some may be accepted and some rejected. For those that get a response, their
3806 status is fixed; any that are accepted have been handed over, even if later
3807 responses crash - at least, that's how I read RFC 2033.
3809 If all went well, mark the recipient addresses as completed, record which
3810 host/IPaddress they were delivered to, and cut out RSET when sending another
3811 message down the same channel. Write the completed addresses to the journal
3812 now so that they are recorded in case there is a crash of hardware or
3813 software before the spool gets updated. Also record the final SMTP
3814 confirmation if needed (for SMTP only). */
3819 struct timeval delivery_time;
3821 uschar * conf = NULL;
3823 timesince(&delivery_time, &start_delivery_time);
3824 sx.send_rset = FALSE;
3825 pipelining_active = FALSE;
3827 /* Set up confirmation if needed - applies only to SMTP */
3830 #ifdef DISABLE_EVENT
3831 LOGGING(smtp_confirmation) &&
3836 const uschar *s = string_printing(sx.buffer);
3837 /* deconst cast ok here as string_printing was checked to have alloc'n'copied */
3838 conf = (s == sx.buffer)? US string_copy(s) : US s;
3841 /* Process all transported addresses - for LMTP or PRDR, read a status for
3844 for (address_item * addr = addrlist; addr != sx.first_addr; addr = addr->next)
3846 if (addr->transport_return != PENDING_OK) continue;
3848 /* LMTP - if the response fails badly (e.g. timeout), use it for all the
3849 remaining addresses. Otherwise, it's a return code for just the one
3850 address. For temporary errors, add a retry item for the address so that
3851 it doesn't get tried again too soon. */
3853 #ifndef DISABLE_PRDR
3854 if (sx.lmtp || sx.prdr_active)
3859 if (!smtp_read_response(&sx, sx.buffer, sizeof(sx.buffer), '2',
3862 if (errno != 0 || sx.buffer[0] == 0) goto RESPONSE_FAILED;
3863 addr->message = string_sprintf(
3864 #ifndef DISABLE_PRDR
3865 "%s error after %s: %s", sx.prdr_active ? "PRDR":"LMTP",
3867 "LMTP error after %s: %s",
3869 data_command, string_printing(sx.buffer));
3870 setflag(addr, af_pass_message); /* Allow message to go to user */
3871 if (sx.buffer[0] == '5')
3872 addr->transport_return = FAIL;
3875 errno = ERRNO_DATA4XX;
3876 addr->more_errno |= ((sx.buffer[1] - '0')*10 + sx.buffer[2] - '0') << 8;
3877 addr->transport_return = DEFER;
3878 #ifndef DISABLE_PRDR
3879 if (!sx.prdr_active)
3881 retry_add_item(addr, addr->address_retry_key, 0);
3885 sx.completed_addr = TRUE; /* NOW we can set this flag */
3886 if (LOGGING(smtp_confirmation))
3888 const uschar *s = string_printing(sx.buffer);
3889 /* deconst cast ok here as string_printing was checked to have alloc'n'copied */
3890 conf = (s == sx.buffer) ? US string_copy(s) : US s;
3894 /* SMTP, or success return from LMTP for this address. Pass back the
3895 actual host that was used. */
3897 addr->transport_return = OK;
3898 addr->more_errno = delivery_time.tv_sec;
3899 addr->delivery_usec = delivery_time.tv_usec;
3900 addr->host_used = host;
3901 addr->special_action = flag;
3902 addr->message = conf;
3904 if (tcp_out_fastopen)
3906 setflag(addr, af_tcp_fastopen_conn);
3907 if (tcp_out_fastopen >= TFO_USED_NODATA) setflag(addr, af_tcp_fastopen);
3908 if (tcp_out_fastopen >= TFO_USED_DATA) setflag(addr, af_tcp_fastopen_data);
3910 if (sx.pipelining_used) setflag(addr, af_pipelining);
3911 #ifdef SUPPORT_PIPE_CONNECT
3912 if (sx.early_pipe_active) setflag(addr, af_early_pipe);
3914 #ifndef DISABLE_PRDR
3915 if (sx.prdr_active) setflag(addr, af_prdr_used);
3917 if (sx.peer_offered & OPTION_CHUNKING) setflag(addr, af_chunking_used);
3920 #ifndef DISABLE_PRDR
3921 if (!sx.prdr_active)
3924 /* Update the journal. For homonymic addresses, use the base address plus
3925 the transport name. See lots of comments in deliver.c about the reasons
3926 for the complications when homonyms are involved. Just carry on after
3927 write error, as it may prove possible to update the spool file later. */
3929 if (testflag(addr, af_homonym))
3930 sprintf(CS sx.buffer, "%.500s/%s\n", addr->unique + 3, tblock->name);
3932 sprintf(CS sx.buffer, "%.500s\n", addr->unique);
3934 DEBUG(D_deliver) debug_printf("S:journalling %s\n", sx.buffer);
3935 len = Ustrlen(CS sx.buffer);
3936 if (write(journal_fd, sx.buffer, len) != len)
3937 log_write(0, LOG_MAIN|LOG_PANIC, "failed to write journal for "
3938 "%s: %s", sx.buffer, strerror(errno));
3942 #ifndef DISABLE_PRDR
3945 const uschar * overall_message;
3947 /* PRDR - get the final, overall response. For any non-success
3948 upgrade all the address statuses. */
3950 sx.ok = smtp_read_response(&sx, sx.buffer, sizeof(sx.buffer), '2',
3954 if(errno == 0 && sx.buffer[0] == '4')
3956 errno = ERRNO_DATA4XX;
3957 addrlist->more_errno |= ((sx.buffer[1] - '0')*10 + sx.buffer[2] - '0') << 8;
3959 for (address_item * addr = addrlist; addr != sx.first_addr; addr = addr->next)
3960 if (sx.buffer[0] == '5' || addr->transport_return == OK)
3961 addr->transport_return = PENDING_OK; /* allow set_errno action */
3962 goto RESPONSE_FAILED;
3965 /* Append the overall response to the individual PRDR response for logging
3966 and update the journal, or setup retry. */
3968 overall_message = string_printing(sx.buffer);
3969 for (address_item * addr = addrlist; addr != sx.first_addr; addr = addr->next)
3970 if (addr->transport_return == OK)
3971 addr->message = string_sprintf("%s\\n%s", addr->message, overall_message);
3973 for (address_item * addr = addrlist; addr != sx.first_addr; addr = addr->next)
3974 if (addr->transport_return == OK)
3976 if (testflag(addr, af_homonym))
3977 sprintf(CS sx.buffer, "%.500s/%s\n", addr->unique + 3, tblock->name);
3979 sprintf(CS sx.buffer, "%.500s\n", addr->unique);
3981 DEBUG(D_deliver) debug_printf("journalling(PRDR) %s\n", sx.buffer);
3982 len = Ustrlen(CS sx.buffer);
3983 if (write(journal_fd, sx.buffer, len) != len)
3984 log_write(0, LOG_MAIN|LOG_PANIC, "failed to write journal for "
3985 "%s: %s", sx.buffer, strerror(errno));
3987 else if (addr->transport_return == DEFER)
3988 retry_add_item(addr, addr->address_retry_key, -2);
3992 /* Ensure the journal file is pushed out to disk. */
3994 if (EXIMfsync(journal_fd) < 0)
3995 log_write(0, LOG_MAIN|LOG_PANIC, "failed to fsync journal: %s",
4001 /* Handle general (not specific to one address) failures here. The value of ok
4002 is used to skip over this code on the falling through case. A timeout causes a
4003 deferral. Other errors may defer or fail according to the response code, and
4004 may set up a special errno value, e.g. after connection chopped, which is
4005 assumed if errno == 0 and there is no text in the buffer. If control reaches
4006 here during the setting up phase (i.e. before MAIL FROM) then always defer, as
4007 the problem is not related to this specific message. */
4012 uschar * set_message;
4018 sx.send_quit = check_response(host, &save_errno, addrlist->more_errno,
4019 sx.buffer, &code, &message, &pass_message);
4027 message = string_sprintf("send() to %s [%s] failed: %s",
4028 host->name, host->address, message ? message : US strerror(save_errno));
4029 sx.send_quit = FALSE;
4037 sx.ok = FALSE; /* For when reached by GOTO */
4038 set_message = message;
4040 /* We want to handle timeouts after MAIL or "." and loss of connection after
4041 "." specially. They can indicate a problem with the sender address or with
4042 the contents of the message rather than a real error on the connection. These
4043 cases are treated in the same way as a 4xx response. This next bit of code
4044 does the classification. */
4051 message_error = TRUE;
4055 message_error = Ustrncmp(smtp_command,"MAIL",4) == 0 ||
4056 Ustrncmp(smtp_command,"end ",4) == 0;
4059 case ERRNO_SMTPCLOSED:
4060 message_error = Ustrncmp(smtp_command,"end ",4) == 0;
4064 message_error = FALSE;
4068 /* Handle the cases that are treated as message errors. These are:
4070 (a) negative response or timeout after MAIL
4071 (b) negative response after DATA
4072 (c) negative response or timeout or dropped connection after "."
4073 (d) utf8 support required and not offered
4075 It won't be a negative response or timeout after RCPT, as that is dealt
4076 with separately above. The action in all cases is to set an appropriate
4077 error code for all the addresses, but to leave yield set to OK because the
4078 host itself has not failed. Of course, it might in practice have failed
4079 when we've had a timeout, but if so, we'll discover that at the next
4080 delivery attempt. For a temporary error, set the message_defer flag, and
4081 write to the logs for information if this is not the last host. The error
4082 for the last host will be logged as part of the address's log line. */
4086 if (mua_wrapper) code = '5'; /* Force hard failure in wrapper mode */
4088 /* If there's an errno, the message contains just the identity of
4093 else /* Anything other than 5 is treated as temporary */
4097 message = US string_sprintf("%s: %s", message, strerror(save_errno));
4099 write_logs(host, message, sx.first_addr ? sx.first_addr->basic_errno : 0);
4101 *message_defer = TRUE;
4105 /* Otherwise, we have an I/O error or a timeout other than after MAIL or
4106 ".", or some other transportation error. We defer all addresses and yield
4107 DEFER, except for the case of failed add_headers expansion, or a transport
4108 filter failure, when the yield should be ERROR, to stop it trying other
4113 #ifdef SUPPORT_PIPE_CONNECT
4114 /* If we were early-pipelinng and the actual EHLO response did not match
4115 the cached value we assumed, we could have detected it and passed a
4116 custom errno through to here. It would be nice to RSET and retry right
4117 away, but to reliably do that we eould need an extra synch point before
4118 we committed to data and that would discard half the gained roundrips.
4119 Or we could summarily drop the TCP connection. but that is also ugly.
4120 Instead, we ignore the possibility (having freshened the cache) and rely
4121 on the server telling us with a nonmessage error if we have tried to
4122 do something it no longer supports. */
4125 yield = (save_errno == ERRNO_CHHEADER_FAIL ||
4126 save_errno == ERRNO_FILTER_FAIL) ? ERROR : DEFER;
4130 set_errno(addrlist, save_errno, set_message, set_rc, pass_message, host
4131 #ifdef EXPERIMENTAL_DSN_INFO
4132 , sx.smtp_greeting, sx.helo_response
4138 /* If all has gone well, send_quit will be set TRUE, implying we can end the
4139 SMTP session tidily. However, if there were too many addresses to send in one
4140 message (indicated by first_addr being non-NULL) we want to carry on with the
4141 rest of them. Also, it is desirable to send more than one message down the SMTP
4142 connection if there are several waiting, provided we haven't already sent so
4143 many as to hit the configured limit. The function transport_check_waiting looks
4144 for a waiting message and returns its id. Then transport_pass_socket tries to
4145 set up a continued delivery by passing the socket on to another process. The
4146 variable send_rset is FALSE if a message has just been successfully transferred.
4148 If we are already sending down a continued channel, there may be further
4149 addresses not yet delivered that are aimed at the same host, but which have not
4150 been passed in this run of the transport. In this case, continue_more will be
4151 true, and all we should do is send RSET if necessary, and return, leaving the
4154 However, if no address was disposed of, i.e. all addresses got 4xx errors, we
4155 do not want to continue with other messages down the same channel, because that
4156 can lead to looping between two or more messages, all with the same,
4157 temporarily failing address(es). [The retry information isn't updated yet, so
4158 new processes keep on trying.] We probably also don't want to try more of this
4159 message's addresses either.
4161 If we have started a TLS session, we have to end it before passing the
4162 connection to a new process. However, not all servers can handle this (Exim
4163 can), so we do not pass such a connection on if the host matches
4164 hosts_nopass_tls. */
4167 debug_printf("ok=%d send_quit=%d send_rset=%d continue_more=%d "
4168 "yield=%d first_address is %sNULL\n", sx.ok, sx.send_quit,
4169 sx.send_rset, f.continue_more, yield, sx.first_addr ? "not " : "");
4171 if (sx.completed_addr && sx.ok && sx.send_quit)
4174 smtp_compare_t t_compare;
4176 t_compare.tblock = tblock;
4177 t_compare.current_sender_address = sender_address;
4179 if ( sx.first_addr != NULL
4183 ( tls_out.active.sock < 0 && !continue_proxy_cipher
4184 || verify_check_given_host(CUSS &ob->hosts_nopass_tls, host) != OK
4188 transport_check_waiting(tblock->name, host->name,
4189 tblock->connection_max_messages, new_message_id, &more,
4190 (oicf)smtp_are_same_identities, (void*)&t_compare)
4197 if (! (sx.ok = smtp_write_command(&sx, SCMD_FLUSH, "RSET\r\n") >= 0))
4199 msg = US string_sprintf("send() to %s [%s] failed: %s", host->name,
4200 host->address, strerror(errno));
4201 sx.send_quit = FALSE;
4203 else if (! (sx.ok = smtp_read_response(&sx, sx.buffer, sizeof(sx.buffer),
4204 '2', ob->command_timeout)))
4207 sx.send_quit = check_response(host, &errno, 0, sx.buffer, &code, &msg,
4211 DEBUG(D_transport) debug_printf("H=%s [%s] %s\n",
4212 host->name, host->address, msg);
4216 /* Either RSET was not needed, or it succeeded */
4223 int socket_fd = sx.cctx.sock;
4226 if (sx.first_addr != NULL) /* More addresses still to be sent */
4227 { /* in this run of the transport */
4228 continue_sequence++; /* Causes * in logging */
4232 /* Unless caller said it already has more messages listed for this host,
4233 pass the connection on to a new Exim process (below, the call to
4234 transport_pass_socket). If the caller has more ready, just return with
4235 the connection still open. */
4238 if (tls_out.active.sock >= 0)
4239 if ( f.continue_more
4240 || verify_check_given_host(CUSS &ob->hosts_noproxy_tls, host) == OK)
4242 /* Before passing the socket on, or returning to caller with it still
4243 open, we must shut down TLS. Not all MTAs allow for the continuation
4244 of the SMTP session when TLS is shut down. We test for this by sending
4245 a new EHLO. If we don't get a good response, we don't attempt to pass
4248 tls_close(sx.cctx.tls_ctx, TLS_SHUTDOWN_WAIT);
4249 sx.cctx.tls_ctx = NULL;
4250 smtp_peer_options = smtp_peer_options_wrap;
4252 && smtp_write_command(&sx, SCMD_FLUSH, "EHLO %s\r\n", sx.helo_data)
4254 && smtp_read_response(&sx, sx.buffer, sizeof(sx.buffer),
4255 '2', ob->command_timeout);
4257 if (sx.ok && f.continue_more)
4258 return yield; /* More addresses for another run */
4262 /* Set up a pipe for proxying TLS for the new transport process */
4264 smtp_peer_options |= OPTION_TLS;
4265 if (sx.ok = (socketpair(AF_UNIX, SOCK_STREAM, 0, pfd) == 0))
4268 set_errno(sx.first_addr, errno, US"internal allocation problem",
4270 # ifdef EXPERIMENTAL_DSN_INFO
4271 , sx.smtp_greeting, sx.helo_response
4277 if (f.continue_more)
4278 return yield; /* More addresses for another run */
4280 /* If the socket is successfully passed, we mustn't send QUIT (or
4281 indeed anything!) from here. */
4283 /*XXX DSN_INFO: assume likely to do new HELO; but for greet we'll want to
4284 propagate it from the initial
4286 if (sx.ok && transport_pass_socket(tblock->name, host->name,
4287 host->address, new_message_id, socket_fd))
4289 sx.send_quit = FALSE;
4291 /* We have passed the client socket to a fresh transport process.
4292 If TLS is still active, we need to proxy it for the transport we
4293 just passed the baton to. Fork a child to to do it, and return to
4294 get logging done asap. Which way to place the work makes assumptions
4295 about post-fork prioritisation which may not hold on all platforms. */
4297 if (tls_out.active.sock >= 0)
4300 if (pid == 0) /* child; fork again to disconnect totally */
4302 if (f.running_in_test_harness) millisleep(100); /* let parent debug out */
4303 /* does not return */
4304 smtp_proxy_tls(sx.cctx.tls_ctx, sx.buffer, sizeof(sx.buffer), pfd,
4305 ob->command_timeout);
4308 if (pid > 0) /* parent */
4310 DEBUG(D_transport) debug_printf("proxy-proc inter-pid %d\n", pid);
4312 /* tidy the inter-proc to disconn the proxy proc */
4313 waitpid(pid, NULL, 0);
4314 tls_close(sx.cctx.tls_ctx, TLS_NO_SHUTDOWN);
4315 sx.cctx.tls_ctx = NULL;
4316 (void)close(sx.cctx.sock);
4318 continue_transport = NULL;
4319 continue_hostname = NULL;
4322 log_write(0, LOG_PANIC_DIE, "fork failed");
4328 /* If RSET failed and there are addresses left, they get deferred. */
4330 set_errno(sx.first_addr, errno, msg, DEFER, FALSE, host
4331 #ifdef EXPERIMENTAL_DSN_INFO
4332 , sx.smtp_greeting, sx.helo_response
4338 /* End off tidily with QUIT unless the connection has died or the socket has
4339 been passed to another process. There has been discussion on the net about what
4340 to do after sending QUIT. The wording of the RFC suggests that it is necessary
4341 to wait for a response, but on the other hand, there isn't anything one can do
4342 with an error response, other than log it. Exim used to do that. However,
4343 further discussion suggested that it is positively advantageous not to wait for
4344 the response, but to close the session immediately. This is supposed to move
4345 the TCP/IP TIME_WAIT state from the server to the client, thereby removing some
4346 load from the server. (Hosts that are both servers and clients may not see much
4347 difference, of course.) Further discussion indicated that this was safe to do
4348 on Unix systems which have decent implementations of TCP/IP that leave the
4349 connection around for a while (TIME_WAIT) after the application has gone away.
4350 This enables the response sent by the server to be properly ACKed rather than
4351 timed out, as can happen on broken TCP/IP implementations on other OS.
4353 This change is being made on 31-Jul-98. After over a year of trouble-free
4354 operation, the old commented-out code was removed on 17-Sep-99. */
4358 (void) setsockopt(sx.cctx.sock, IPPROTO_TCP, TCP_CORK, US &on, sizeof(on));
4360 if (sx.send_quit) (void)smtp_write_command(&sx, SCMD_FLUSH, "QUIT\r\n");
4365 tls_close(sx.cctx.tls_ctx, TLS_SHUTDOWN_NOWAIT);
4366 sx.cctx.tls_ctx = NULL;
4369 /* Close the socket, and return the appropriate value, first setting
4370 works because the NULL setting is passed back to the calling process, and
4371 remote_max_parallel is forced to 1 when delivering over an existing connection,
4373 If all went well and continue_more is set, we shouldn't actually get here if
4374 there are further addresses, as the return above will be taken. However,
4375 writing RSET might have failed, or there may be other addresses whose hosts are
4376 specified in the transports, and therefore not visible at top level, in which
4377 case continue_more won't get set. */
4379 HDEBUG(D_transport|D_acl|D_v) debug_printf_indent(" SMTP(close)>>\n");
4382 shutdown(sx.cctx.sock, SHUT_WR);
4383 millisleep(f.running_in_test_harness ? 200 : 20);
4384 if (fcntl(sx.cctx.sock, F_SETFL, O_NONBLOCK) == 0)
4385 for (int i = 16; read(sx.cctx.sock, sx.inbuffer, sizeof(sx.inbuffer)) > 0 && i > 0;)
4386 i--; /* drain socket */
4388 (void)close(sx.cctx.sock);
4390 #ifndef DISABLE_EVENT
4391 (void) event_raise(tblock->event_action, US"tcp:close", NULL);
4394 continue_transport = NULL;
4395 continue_hostname = NULL;
4402 /*************************************************
4403 * Closedown entry point *
4404 *************************************************/
4406 /* This function is called when exim is passed an open smtp channel
4407 from another incarnation, but the message which it has been asked
4408 to deliver no longer exists. The channel is on stdin.
4410 We might do fancy things like looking for another message to send down
4411 the channel, but if the one we sought has gone, it has probably been
4412 delivered by some other process that itself will seek further messages,
4413 so just close down our connection.
4415 Argument: pointer to the transport instance block
4420 smtp_transport_closedown(transport_instance *tblock)
4422 smtp_transport_options_block * ob = SOB tblock->options_block;
4423 client_conn_ctx cctx;
4426 uschar inbuffer[4096];
4427 uschar outbuffer[16];
4429 /*XXX really we need an active-smtp-client ctx, rather than assuming stdout */
4430 cctx.sock = fileno(stdin);
4431 cctx.tls_ctx = cctx.sock == tls_out.active.sock ? tls_out.active.tls_ctx : NULL;
4433 sx.inblock.cctx = &cctx;
4434 sx.inblock.buffer = inbuffer;
4435 sx.inblock.buffersize = sizeof(inbuffer);
4436 sx.inblock.ptr = inbuffer;
4437 sx.inblock.ptrend = inbuffer;
4439 sx.outblock.cctx = &cctx;
4440 sx.outblock.buffersize = sizeof(outbuffer);
4441 sx.outblock.buffer = outbuffer;
4442 sx.outblock.ptr = outbuffer;
4443 sx.outblock.cmd_count = 0;
4444 sx.outblock.authenticating = FALSE;
4446 (void)smtp_write_command(&sx, SCMD_FLUSH, "QUIT\r\n");
4447 (void)smtp_read_response(&sx, buffer, sizeof(buffer), '2', ob->command_timeout);
4448 (void)close(cctx.sock);
4453 /*************************************************
4454 * Prepare addresses for delivery *
4455 *************************************************/
4457 /* This function is called to flush out error settings from previous delivery
4458 attempts to other hosts. It also records whether we got here via an MX record
4459 or not in the more_errno field of the address. We are interested only in
4460 addresses that are still marked DEFER - others may have got delivered to a
4461 previously considered IP address. Set their status to PENDING_DEFER to indicate
4462 which ones are relevant this time.
4465 addrlist the list of addresses
4466 host the host we are delivering to
4468 Returns: the first address for this delivery
4471 static address_item *
4472 prepare_addresses(address_item *addrlist, host_item *host)
4474 address_item *first_addr = NULL;
4475 for (address_item * addr = addrlist; addr; addr = addr->next)
4476 if (addr->transport_return == DEFER)
4478 if (!first_addr) first_addr = addr;
4479 addr->transport_return = PENDING_DEFER;
4480 addr->basic_errno = 0;
4481 addr->more_errno = (host->mx >= 0)? 'M' : 'A';
4482 addr->message = NULL;
4484 addr->cipher = NULL;
4485 addr->ourcert = NULL;
4486 addr->peercert = NULL;
4487 addr->peerdn = NULL;
4488 addr->ocsp = OCSP_NOT_REQ;
4490 #ifdef EXPERIMENTAL_DSN_INFO
4491 addr->smtp_greeting = NULL;
4492 addr->helo_response = NULL;
4500 /*************************************************
4501 * Main entry point *
4502 *************************************************/
4504 /* See local README for interface details. As this is a remote transport, it is
4505 given a chain of addresses to be delivered in one connection, if possible. It
4506 always returns TRUE, indicating that each address has its own independent
4507 status set, except if there is a setting up problem, in which case it returns
4511 smtp_transport_entry(
4512 transport_instance *tblock, /* data for this instantiation */
4513 address_item *addrlist) /* addresses we are working on */
4516 int hosts_defer = 0;
4518 int hosts_looked_up = 0;
4519 int hosts_retry = 0;
4520 int hosts_serial = 0;
4521 int hosts_total = 0;
4522 int total_hosts_tried = 0;
4523 BOOL expired = TRUE;
4524 uschar *expanded_hosts = NULL;
4526 uschar *tid = string_sprintf("%s transport", tblock->name);
4527 smtp_transport_options_block *ob = SOB tblock->options_block;
4528 host_item *hostlist = addrlist->host_list;
4529 host_item *host = NULL;
4533 debug_printf("%s transport entered\n", tblock->name);
4534 for (address_item * addr = addrlist; addr; addr = addr->next)
4535 debug_printf(" %s\n", addr->address);
4538 debug_printf("hostlist:\n");
4539 for (host_item * host = hostlist; host; host = host->next)
4540 debug_printf(" '%s' IP %s port %d\n", host->name, host->address, host->port);
4542 if (continue_hostname)
4543 debug_printf("already connected to %s [%s] (on fd %d)\n",
4544 continue_hostname, continue_host_address,
4545 cutthrough.cctx.sock >= 0 ? cutthrough.cctx.sock : 0);
4548 /* Set the flag requesting that these hosts be added to the waiting
4549 database if the delivery fails temporarily or if we are running with
4550 queue_smtp or a 2-stage queue run. This gets unset for certain
4551 kinds of error, typically those that are specific to the message. */
4553 update_waiting = TRUE;
4555 /* If a host list is not defined for the addresses - they must all have the
4556 same one in order to be passed to a single transport - or if the transport has
4557 a host list with hosts_override set, use the host list supplied with the
4558 transport. It is an error for this not to exist. */
4560 if (!hostlist || (ob->hosts_override && ob->hosts))
4564 addrlist->message = string_sprintf("%s transport called with no hosts set",
4566 addrlist->transport_return = PANIC;
4567 return FALSE; /* Only top address has status */
4570 DEBUG(D_transport) debug_printf("using the transport's hosts: %s\n",
4573 /* If the transport's host list contains no '$' characters, and we are not
4574 randomizing, it is fixed and therefore a chain of hosts can be built once
4575 and for all, and remembered for subsequent use by other calls to this
4576 transport. If, on the other hand, the host list does contain '$', or we are
4577 randomizing its order, we have to rebuild it each time. In the fixed case,
4578 as the hosts string will never be used again, it doesn't matter that we
4579 replace all the : characters with zeros. */
4583 uschar *s = ob->hosts;
4585 if (Ustrchr(s, '$') != NULL)
4587 if (!(expanded_hosts = expand_string(s)))
4589 addrlist->message = string_sprintf("failed to expand list of hosts "
4590 "\"%s\" in %s transport: %s", s, tblock->name, expand_string_message);
4591 addrlist->transport_return = f.search_find_defer ? DEFER : PANIC;
4592 return FALSE; /* Only top address has status */
4594 DEBUG(D_transport) debug_printf("expanded list of hosts \"%s\" to "
4595 "\"%s\"\n", s, expanded_hosts);
4599 if (ob->hosts_randomize) s = expanded_hosts = string_copy(s);
4601 host_build_hostlist(&hostlist, s, ob->hosts_randomize);
4603 /* Check that the expansion yielded something useful. */
4607 string_sprintf("%s transport has empty hosts setting", tblock->name);
4608 addrlist->transport_return = PANIC;
4609 return FALSE; /* Only top address has status */
4612 /* If there was no expansion of hosts, save the host list for
4615 if (!expanded_hosts) ob->hostlist = hostlist;
4618 /* This is not the first time this transport has been run in this delivery;
4619 the host list was built previously. */
4622 hostlist = ob->hostlist;
4625 /* The host list was supplied with the address. If hosts_randomize is set, we
4626 must sort it into a random order if it did not come from MX records and has not
4627 already been randomized (but don't bother if continuing down an existing
4630 else if (ob->hosts_randomize && hostlist->mx == MX_NONE && !continue_hostname)
4632 host_item *newlist = NULL;
4635 host_item *h = hostlist;
4636 hostlist = hostlist->next;
4638 h->sort_key = random_number(100);
4645 else if (h->sort_key < newlist->sort_key)
4652 host_item *hh = newlist;
4655 if (h->sort_key < hh->next->sort_key) break;
4663 hostlist = addrlist->host_list = newlist;
4666 /* Sort out the default port. */
4668 if (!smtp_get_port(ob->port, addrlist, &defport, tid)) return FALSE;
4670 /* For each host-plus-IP-address on the list:
4672 . If this is a continued delivery and the host isn't the one with the
4673 current connection, skip.
4675 . If the status is unusable (i.e. previously failed or retry checked), skip.
4677 . If no IP address set, get the address, either by turning the name into
4678 an address, calling gethostbyname if gethostbyname is on, or by calling
4679 the DNS. The DNS may yield multiple addresses, in which case insert the
4680 extra ones into the list.
4682 . Get the retry data if not previously obtained for this address and set the
4683 field which remembers the state of this address. Skip if the retry time is
4684 not reached. If not, remember whether retry data was found. The retry string
4685 contains both the name and the IP address.
4687 . Scan the list of addresses and mark those whose status is DEFER as
4688 PENDING_DEFER. These are the only ones that will be processed in this cycle
4691 . Make a delivery attempt - addresses marked PENDING_DEFER will be tried.
4692 Some addresses may be successfully delivered, others may fail, and yet
4693 others may get temporary errors and so get marked DEFER.
4695 . The return from the delivery attempt is OK if a connection was made and a
4696 valid SMTP dialogue was completed. Otherwise it is DEFER.
4698 . If OK, add a "remove" retry item for this host/IPaddress, if any.
4700 . If fail to connect, or other defer state, add a retry item.
4702 . If there are any addresses whose status is still DEFER, carry on to the
4703 next host/IPaddress, unless we have tried the number of hosts given
4704 by hosts_max_try or hosts_max_try_hardlimit; otherwise return. Note that
4705 there is some fancy logic for hosts_max_try that means its limit can be
4706 overstepped in some circumstances.
4708 If we get to the end of the list, all hosts have deferred at least one address,
4709 or not reached their retry times. If delay_after_cutoff is unset, it requests a
4710 delivery attempt to those hosts whose last try was before the arrival time of
4711 the current message. To cope with this, we have to go round the loop a second
4712 time. After that, set the status and error data for any addresses that haven't
4713 had it set already. */
4715 for (int cutoff_retry = 0;
4716 expired && cutoff_retry < (ob->delay_after_cutoff ? 1 : 2);
4719 host_item *nexthost = NULL;
4720 int unexpired_hosts_tried = 0;
4721 BOOL continue_host_tried = FALSE;
4723 retry_non_continued:
4724 for (host = hostlist;
4726 && unexpired_hosts_tried < ob->hosts_max_try
4727 && total_hosts_tried < ob->hosts_max_try_hardlimit;
4732 BOOL host_is_expired = FALSE;
4733 BOOL message_defer = FALSE;
4734 BOOL some_deferred = FALSE;
4735 address_item *first_addr = NULL;
4736 uschar *interface = NULL;
4737 uschar *retry_host_key = NULL;
4738 uschar *retry_message_key = NULL;
4739 uschar *serialize_key = NULL;
4741 /* Default next host is next host. :-) But this can vary if the
4742 hosts_max_try limit is hit (see below). It may also be reset if a host
4743 address is looked up here (in case the host was multihomed). */
4745 nexthost = host->next;
4747 /* If the address hasn't yet been obtained from the host name, look it up
4748 now, unless the host is already marked as unusable. If it is marked as
4749 unusable, it means that the router was unable to find its IP address (in
4750 the DNS or wherever) OR we are in the 2nd time round the cutoff loop, and
4751 the lookup failed last time. We don't get this far if *all* MX records
4752 point to non-existent hosts; that is treated as a hard error.
4754 We can just skip this host entirely. When the hosts came from the router,
4755 the address will timeout based on the other host(s); when the address is
4756 looked up below, there is an explicit retry record added.
4758 Note that we mustn't skip unusable hosts if the address is not unset; they
4759 may be needed as expired hosts on the 2nd time round the cutoff loop. */
4763 int new_port, flags;
4765 if (host->status >= hstatus_unusable)
4767 DEBUG(D_transport) debug_printf("%s has no address and is unusable - skipping\n",
4772 DEBUG(D_transport) debug_printf("getting address for %s\n", host->name);
4774 /* The host name is permitted to have an attached port. Find it, and
4775 strip it from the name. Just remember it for now. */
4777 new_port = host_item_get_port(host);
4779 /* Count hosts looked up */
4783 /* Find by name if so configured, or if it's an IP address. We don't
4784 just copy the IP address, because we need the test-for-local to happen. */
4786 flags = HOST_FIND_BY_A | HOST_FIND_BY_AAAA;
4787 if (ob->dns_qualify_single) flags |= HOST_FIND_QUALIFY_SINGLE;
4788 if (ob->dns_search_parents) flags |= HOST_FIND_SEARCH_PARENTS;
4790 if (ob->gethostbyname || string_is_ip_address(host->name, NULL) != 0)
4791 rc = host_find_byname(host, NULL, flags, NULL, TRUE);
4793 rc = host_find_bydns(host, NULL, flags, NULL, NULL, NULL,
4794 &ob->dnssec, /* domains for request/require */
4797 /* Update the host (and any additional blocks, resulting from
4798 multihoming) with a host-specific port, if any. */
4800 for (host_item * hh = host; hh != nexthost; hh = hh->next) hh->port = new_port;
4802 /* Failure to find the host at this time (usually DNS temporary failure)
4803 is really a kind of routing failure rather than a transport failure.
4804 Therefore we add a retry item of the routing kind, not to stop us trying
4805 to look this name up here again, but to ensure the address gets timed
4806 out if the failures go on long enough. A complete failure at this point
4807 commonly points to a configuration error, but the best action is still
4808 to carry on for the next host. */
4810 if (rc == HOST_FIND_AGAIN || rc == HOST_FIND_SECURITY || rc == HOST_FIND_FAILED)
4812 retry_add_item(addrlist, string_sprintf("R:%s", host->name), 0);
4814 if (rc == HOST_FIND_AGAIN) hosts_defer++; else hosts_fail++;
4815 DEBUG(D_transport) debug_printf("rc = %s for %s\n", (rc == HOST_FIND_AGAIN)?
4816 "HOST_FIND_AGAIN" : "HOST_FIND_FAILED", host->name);
4817 host->status = hstatus_unusable;
4819 for (address_item * addr = addrlist; addr; addr = addr->next)
4821 if (addr->transport_return != DEFER) continue;
4822 addr->basic_errno = ERRNO_UNKNOWNHOST;
4823 addr->message = string_sprintf(
4824 rc == HOST_FIND_SECURITY
4825 ? "lookup of IP address for %s was insecure"
4826 : "failed to lookup IP address for %s",
4832 /* If the host is actually the local host, we may have a problem, or
4833 there may be some cunning configuration going on. In the problem case,
4834 log things and give up. The default transport status is already DEFER. */
4836 if (rc == HOST_FOUND_LOCAL && !ob->allow_localhost)
4838 for (address_item * addr = addrlist; addr; addr = addr->next)
4840 addr->basic_errno = 0;
4841 addr->message = string_sprintf("%s transport found host %s to be "
4842 "local", tblock->name, host->name);
4846 } /* End of block for IP address lookup */
4848 /* If this is a continued delivery, we are interested only in the host
4849 which matches the name of the existing open channel. The check is put
4850 here after the local host lookup, in case the name gets expanded as a
4851 result of the lookup. Set expired FALSE, to save the outer loop executing
4854 if (continue_hostname)
4855 if ( Ustrcmp(continue_hostname, host->name) != 0
4856 || Ustrcmp(continue_host_address, host->address) != 0
4860 continue; /* With next host */
4863 continue_host_tried = TRUE;
4865 /* Reset the default next host in case a multihomed host whose addresses
4866 are not looked up till just above added to the host list. */
4868 nexthost = host->next;
4870 /* If queue_smtp is set (-odqs or the first part of a 2-stage run), or the
4871 domain is in queue_smtp_domains, we don't actually want to attempt any
4872 deliveries. When doing a queue run, queue_smtp_domains is always unset. If
4873 there is a lookup defer in queue_smtp_domains, proceed as if the domain
4874 were not in it. We don't want to hold up all SMTP deliveries! Except when
4875 doing a two-stage queue run, don't do this if forcing. */
4877 if ((!f.deliver_force || f.queue_2stage) && (f.queue_smtp ||
4878 match_isinlist(addrlist->domain,
4879 (const uschar **)&queue_smtp_domains, 0,
4880 &domainlist_anchor, NULL, MCL_DOMAIN, TRUE, NULL) == OK))
4883 for (address_item * addr = addrlist; addr; addr = addr->next)
4884 if (addr->transport_return == DEFER)
4885 addr->message = US"domain matches queue_smtp_domains, or -odqs set";
4886 continue; /* With next host */
4889 /* Count hosts being considered - purely for an intelligent comment
4890 if none are usable. */
4894 /* Set $host and $host address now in case they are needed for the
4895 interface expansion or the serialize_hosts check; they remain set if an
4896 actual delivery happens. */
4898 deliver_host = host->name;
4899 deliver_host_address = host->address;
4900 lookup_dnssec_authenticated = host->dnssec == DS_YES ? US"yes"
4901 : host->dnssec == DS_NO ? US"no"
4904 /* Set up a string for adding to the retry key if the port number is not
4905 the standard SMTP port. A host may have its own port setting that overrides
4908 pistring = string_sprintf(":%d", host->port == PORT_NONE
4909 ? defport : host->port);
4910 if (Ustrcmp(pistring, ":25") == 0) pistring = US"";
4912 /* Select IPv4 or IPv6, and choose an outgoing interface. If the interface
4913 string is set, even if constant (as different transports can have different
4914 constant settings), we must add it to the key that is used for retries,
4915 because connections to the same host from a different interface should be
4916 treated separately. */
4918 host_af = Ustrchr(host->address, ':') == NULL ? AF_INET : AF_INET6;
4920 uschar * s = ob->interface;
4923 if (!smtp_get_interface(s, host_af, addrlist, &interface, tid))
4925 pistring = string_sprintf("%s/%s", pistring, interface);
4929 /* The first time round the outer loop, check the status of the host by
4930 inspecting the retry data. The second time round, we are interested only
4931 in expired hosts that haven't been tried since this message arrived. */
4933 if (cutoff_retry == 0)
4936 /* Ensure the status of the address is set by checking retry data if
4937 necessary. There may be host-specific retry data (applicable to all
4938 messages) and also data for retries of a specific message at this host.
4939 If either of these retry records are actually read, the keys used are
4940 returned to save recomputing them later. */
4942 if (exp_bool(addrlist, US"transport", tblock->name, D_transport,
4943 US"retry_include_ip_address", ob->retry_include_ip_address,
4944 ob->expand_retry_include_ip_address, &incl_ip) != OK)
4945 continue; /* with next host */
4947 host_is_expired = retry_check_address(addrlist->domain, host, pistring,
4948 incl_ip, &retry_host_key, &retry_message_key);
4950 DEBUG(D_transport) debug_printf("%s [%s]%s retry-status = %s\n", host->name,
4951 host->address ? host->address : US"", pistring,
4952 host->status == hstatus_usable ? "usable"
4953 : host->status == hstatus_unusable ? "unusable"
4954 : host->status == hstatus_unusable_expired ? "unusable (expired)" : "?");
4956 /* Skip this address if not usable at this time, noting if it wasn't
4957 actually expired, both locally and in the address. */
4959 switch (host->status)
4961 case hstatus_unusable:
4963 setflag(addrlist, af_retry_skipped);
4966 case hstatus_unusable_expired:
4969 case hwhy_retry: hosts_retry++; break;
4970 case hwhy_failed: hosts_fail++; break;
4972 case hwhy_deferred: hosts_defer++; break;
4975 /* If there was a retry message key, implying that previously there
4976 was a message-specific defer, we don't want to update the list of
4977 messages waiting for these hosts. */
4979 if (retry_message_key) update_waiting = FALSE;
4980 continue; /* With the next host or IP address */
4984 /* Second time round the loop: if the address is set but expired, and
4985 the message is newer than the last try, let it through. */
4990 || host->status != hstatus_unusable_expired
4991 || host->last_try > received_time.tv_sec)
4993 DEBUG(D_transport) debug_printf("trying expired host %s [%s]%s\n",
4994 host->name, host->address, pistring);
4995 host_is_expired = TRUE;
4998 /* Setting "expired=FALSE" doesn't actually mean not all hosts are expired;
4999 it remains TRUE only if all hosts are expired and none are actually tried.
5004 /* If this host is listed as one to which access must be serialized,
5005 see if another Exim process has a connection to it, and if so, skip
5006 this host. If not, update the database to record our connection to it
5007 and remember this for later deletion. Do not do any of this if we are
5008 sending the message down a pre-existing connection. */
5010 if ( !continue_hostname
5011 && verify_check_given_host(CUSS &ob->serialize_hosts, host) == OK)
5013 serialize_key = string_sprintf("host-serialize-%s", host->name);
5014 if (!enq_start(serialize_key, 1))
5017 debug_printf("skipping host %s because another Exim process "
5018 "is connected to it\n", host->name);
5024 /* OK, we have an IP address that is not waiting for its retry time to
5025 arrive (it might be expired) OR (second time round the loop) we have an
5026 expired host that hasn't been tried since the message arrived. Have a go
5027 at delivering the message to it. First prepare the addresses by flushing
5028 out the result of previous attempts, and finding the first address that
5029 is still to be delivered. */
5031 first_addr = prepare_addresses(addrlist, host);
5033 DEBUG(D_transport) debug_printf("delivering %s to %s [%s] (%s%s)\n",
5034 message_id, host->name, host->address, addrlist->address,
5035 addrlist->next ? ", ..." : "");
5037 set_process_info("delivering %s to %s [%s]%s (%s%s)",
5038 message_id, host->name, host->address, pistring, addrlist->address,
5039 addrlist->next ? ", ..." : "");
5041 /* This is not for real; don't do the delivery. If there are
5042 any remaining hosts, list them. */
5046 set_errno_nohost(addrlist, 0, NULL, OK, FALSE);
5047 for (address_item * addr = addrlist; addr; addr = addr->next)
5049 addr->host_used = host;
5050 addr->special_action = '*';
5051 addr->message = US"delivery bypassed by -N option";
5055 debug_printf("*** delivery by %s transport bypassed by -N option\n"
5056 "*** host and remaining hosts:\n", tblock->name);
5057 for (host_item * host2 = host; host2; host2 = host2->next)
5058 debug_printf(" %s [%s]\n", host2->name,
5059 host2->address ? host2->address : US"unset");
5064 /* This is for real. If the host is expired, we don't count it for
5065 hosts_max_retry. This ensures that all hosts must expire before an address
5066 is timed out, unless hosts_max_try_hardlimit (which protects against
5067 lunatic DNS configurations) is reached.
5069 If the host is not expired and we are about to hit the hosts_max_retry
5070 limit, check to see if there is a subsequent hosts with a different MX
5071 value. If so, make that the next host, and don't count this one. This is a
5072 heuristic to make sure that different MXs do get tried. With a normal kind
5073 of retry rule, they would get tried anyway when the earlier hosts were
5074 delayed, but if the domain has a "retry every time" type of rule - as is
5075 often used for the the very large ISPs, that won't happen. */
5080 /* Make a copy of the host if it is local to this invocation
5081 of the transport. */
5085 thost = store_get(sizeof(host_item));
5087 thost->name = string_copy(host->name);
5088 thost->address = string_copy(host->address);
5093 if (!host_is_expired && ++unexpired_hosts_tried >= ob->hosts_max_try)
5096 debug_printf("hosts_max_try limit reached with this host\n");
5097 for (host_item * h = host; h; h = h->next) if (h->mx != host->mx)
5100 unexpired_hosts_tried--;
5101 DEBUG(D_transport) debug_printf("however, a higher MX host exists "
5102 "and will be tried\n");
5107 /* Attempt the delivery. */
5109 total_hosts_tried++;
5110 rc = smtp_deliver(addrlist, thost, host_af, defport, interface, tblock,
5111 &message_defer, FALSE);
5114 OK => connection made, each address contains its result;
5115 message_defer is set for message-specific defers (when all
5116 recipients are marked defer)
5117 DEFER => there was a non-message-specific delivery problem;
5118 ERROR => there was a problem setting up the arguments for a filter,
5119 or there was a problem with expanding added headers
5122 /* If the result is not OK, there was a non-message-specific problem.
5123 If the result is DEFER, we need to write to the logs saying what happened
5124 for this particular host, except in the case of authentication and TLS
5125 failures, where the log has already been written. If all hosts defer a
5126 general message is written at the end. */
5128 if (rc == DEFER && first_addr->basic_errno != ERRNO_AUTHFAIL
5129 && first_addr->basic_errno != ERRNO_TLSFAILURE)
5130 write_logs(host, first_addr->message, first_addr->basic_errno);
5132 #ifndef DISABLE_EVENT
5134 deferred_event_raise(first_addr, host);
5137 /* If STARTTLS was accepted, but there was a failure in setting up the
5138 TLS session (usually a certificate screwup), and the host is not in
5139 hosts_require_tls, and tls_tempfail_tryclear is true, try again, with
5140 TLS forcibly turned off. We have to start from scratch with a new SMTP
5141 connection. That's why the retry is done from here, not from within
5142 smtp_deliver(). [Rejections of STARTTLS itself don't screw up the
5143 session, so the in-clear transmission after those errors, if permitted,
5144 happens inside smtp_deliver().] */
5148 && first_addr->basic_errno == ERRNO_TLSFAILURE
5149 && ob->tls_tempfail_tryclear
5150 && verify_check_given_host(CUSS &ob->hosts_require_tls, host) != OK
5153 log_write(0, LOG_MAIN,
5154 "%s: delivering unencrypted to H=%s [%s] (not in hosts_require_tls)",
5155 first_addr->message, host->name, host->address);
5156 first_addr = prepare_addresses(addrlist, host);
5157 rc = smtp_deliver(addrlist, thost, host_af, defport, interface, tblock,
5158 &message_defer, TRUE);
5159 if (rc == DEFER && first_addr->basic_errno != ERRNO_AUTHFAIL)
5160 write_logs(host, first_addr->message, first_addr->basic_errno);
5161 # ifndef DISABLE_EVENT
5163 deferred_event_raise(first_addr, host);
5166 #endif /*DISABLE_TLS*/
5169 /* Delivery attempt finished */
5171 set_process_info("delivering %s: just tried %s [%s]%s for %s%s: result %s",
5172 message_id, host->name, host->address, pistring, addrlist->address,
5173 addrlist->next ? " (& others)" : "", rc_to_string(rc));
5175 /* Release serialization if set up */
5177 if (serialize_key) enq_end(serialize_key);
5179 /* If the result is DEFER, or if a host retry record is known to exist, we
5180 need to add an item to the retry chain for updating the retry database
5181 at the end of delivery. We only need to add the item to the top address,
5182 of course. Also, if DEFER, we mark the IP address unusable so as to skip it
5183 for any other delivery attempts using the same address. (It is copied into
5184 the unusable tree at the outer level, so even if different address blocks
5185 contain the same address, it still won't get tried again.) */
5187 if (rc == DEFER || retry_host_key)
5189 int delete_flag = rc != DEFER ? rf_delete : 0;
5190 if (!retry_host_key)
5193 if (exp_bool(addrlist, US"transport", tblock->name, D_transport,
5194 US"retry_include_ip_address", ob->retry_include_ip_address,
5195 ob->expand_retry_include_ip_address, &incl_ip) != OK)
5196 incl_ip = TRUE; /* error; use most-specific retry record */
5198 retry_host_key = incl_ip
5199 ? string_sprintf("T:%S:%s%s", host->name, host->address, pistring)
5200 : string_sprintf("T:%S%s", host->name, pistring);
5203 /* If a delivery of another message over an existing SMTP connection
5204 yields DEFER, we do NOT set up retry data for the host. This covers the
5205 case when there are delays in routing the addresses in the second message
5206 that are so long that the server times out. This is alleviated by not
5207 routing addresses that previously had routing defers when handling an
5208 existing connection, but even so, this case may occur (e.g. if a
5209 previously happily routed address starts giving routing defers). If the
5210 host is genuinely down, another non-continued message delivery will
5211 notice it soon enough. */
5213 if (delete_flag != 0 || !continue_hostname)
5214 retry_add_item(first_addr, retry_host_key, rf_host | delete_flag);
5216 /* We may have tried an expired host, if its retry time has come; ensure
5217 the status reflects the expiry for the benefit of any other addresses. */
5221 host->status = host_is_expired
5222 ? hstatus_unusable_expired : hstatus_unusable;
5223 host->why = hwhy_deferred;
5227 /* If message_defer is set (host was OK, but every recipient got deferred
5228 because of some message-specific problem), or if that had happened
5229 previously so that a message retry key exists, add an appropriate item
5230 to the retry chain. Note that if there was a message defer but now there is
5231 a host defer, the message defer record gets deleted. That seems perfectly
5232 reasonable. Also, stop the message from being remembered as waiting
5233 for specific hosts. */
5235 if (message_defer || retry_message_key)
5237 int delete_flag = message_defer ? 0 : rf_delete;
5238 if (!retry_message_key)
5241 if (exp_bool(addrlist, US"transport", tblock->name, D_transport,
5242 US"retry_include_ip_address", ob->retry_include_ip_address,
5243 ob->expand_retry_include_ip_address, &incl_ip) != OK)
5244 incl_ip = TRUE; /* error; use most-specific retry record */
5246 retry_message_key = incl_ip
5247 ? string_sprintf("T:%S:%s%s:%s", host->name, host->address, pistring,
5249 : string_sprintf("T:%S%s:%s", host->name, pistring, message_id);
5251 retry_add_item(addrlist, retry_message_key,
5252 rf_message | rf_host | delete_flag);
5253 update_waiting = FALSE;
5256 /* Any return other than DEFER (that is, OK or ERROR) means that the
5257 addresses have got their final statuses filled in for this host. In the OK
5258 case, see if any of them are deferred. */
5261 for (address_item * addr = addrlist; addr; addr = addr->next)
5262 if (addr->transport_return == DEFER)
5264 some_deferred = TRUE;
5268 /* If no addresses deferred or the result was ERROR, return. We do this for
5269 ERROR because a failing filter set-up or add_headers expansion is likely to
5270 fail for any host we try. */
5272 if (rc == ERROR || (rc == OK && !some_deferred))
5274 DEBUG(D_transport) debug_printf("Leaving %s transport\n", tblock->name);
5275 return TRUE; /* Each address has its status */
5278 /* If the result was DEFER or some individual addresses deferred, let
5279 the loop run to try other hosts with the deferred addresses, except for the
5280 case when we were trying to deliver down an existing channel and failed.
5281 Don't try any other hosts in this case. */
5283 if (continue_hostname) break;
5285 /* If the whole delivery, or some individual addresses, were deferred and
5286 there are more hosts that could be tried, do not count this host towards
5287 the hosts_max_try limit if the age of the message is greater than the
5288 maximum retry time for this host. This means we may try try all hosts,
5289 ignoring the limit, when messages have been around for some time. This is
5290 important because if we don't try all hosts, the address will never time
5291 out. NOTE: this does not apply to hosts_max_try_hardlimit. */
5293 if ((rc == DEFER || some_deferred) && nexthost)
5296 retry_config *retry = retry_find_config(host->name, NULL, 0, 0);
5298 if (retry && retry->rules)
5300 retry_rule *last_rule;
5301 for (last_rule = retry->rules;
5303 last_rule = last_rule->next);
5304 timedout = time(NULL) - received_time.tv_sec > last_rule->timeout;
5306 else timedout = TRUE; /* No rule => timed out */
5310 unexpired_hosts_tried--;
5311 DEBUG(D_transport) debug_printf("temporary delivery error(s) override "
5312 "hosts_max_try (message older than host's retry time)\n");
5318 if (unexpired_hosts_tried >= ob->hosts_max_try)
5319 debug_printf("reached transport hosts_max_try limit %d\n",
5321 if (total_hosts_tried >= ob->hosts_max_try_hardlimit)
5322 debug_printf("reached transport hosts_max_try_hardlimit limit %d\n",
5323 ob->hosts_max_try_hardlimit);
5326 if (f.running_in_test_harness) millisleep(500); /* let server debug out */
5327 } /* End of loop for trying multiple hosts. */
5329 /* If we failed to find a matching host in the list, for an already-open
5330 connection, just close it and start over with the list. This can happen
5331 for routing that changes from run to run, or big multi-IP sites with
5334 if (continue_hostname && !continue_host_tried)
5336 int fd = cutthrough.cctx.sock >= 0 ? cutthrough.cctx.sock : 0;
5338 DEBUG(D_transport) debug_printf("no hosts match already-open connection\n");
5340 /* A TLS conn could be open for a cutthrough, but not for a plain continued-
5342 /*XXX doublecheck that! */
5344 if (cutthrough.cctx.sock >= 0 && cutthrough.is_tls)
5346 (void) tls_write(cutthrough.cctx.tls_ctx, US"QUIT\r\n", 6, FALSE);
5347 tls_close(cutthrough.cctx.tls_ctx, TLS_SHUTDOWN_NOWAIT);
5348 cutthrough.cctx.tls_ctx = NULL;
5349 cutthrough.is_tls = FALSE;
5353 (void) write(fd, US"QUIT\r\n", 6);
5356 cutthrough.cctx.sock = -1;
5357 continue_hostname = NULL;
5358 goto retry_non_continued;
5361 /* This is the end of the loop that repeats iff expired is TRUE and
5362 ob->delay_after_cutoff is FALSE. The second time round we will
5363 try those hosts that haven't been tried since the message arrived. */
5367 debug_printf("all IP addresses skipped or deferred at least one address\n");
5368 if (expired && !ob->delay_after_cutoff && cutoff_retry == 0)
5369 debug_printf("retrying IP addresses not tried since message arrived\n");
5374 /* Get here if all IP addresses are skipped or defer at least one address. In
5375 MUA wrapper mode, this will happen only for connection or other non-message-
5376 specific failures. Force the delivery status for all addresses to FAIL. */
5380 for (address_item * addr = addrlist; addr; addr = addr->next)
5381 addr->transport_return = FAIL;
5385 /* In the normal, non-wrapper case, add a standard message to each deferred
5386 address if there hasn't been an error, that is, if it hasn't actually been
5387 tried this time. The variable "expired" will be FALSE if any deliveries were
5388 actually tried, or if there was at least one host that was not expired. That
5389 is, it is TRUE only if no deliveries were tried and all hosts were expired. If
5390 a delivery has been tried, an error code will be set, and the failing of the
5391 message is handled by the retry code later.
5393 If queue_smtp is set, or this transport was called to send a subsequent message
5394 down an existing TCP/IP connection, and something caused the host not to be
5395 found, we end up here, but can detect these cases and handle them specially. */
5397 for (address_item * addr = addrlist; addr; addr = addr->next)
5399 /* If host is not NULL, it means that we stopped processing the host list
5400 because of hosts_max_try or hosts_max_try_hardlimit. In the former case, this
5401 means we need to behave as if some hosts were skipped because their retry
5402 time had not come. Specifically, this prevents the address from timing out.
5403 However, if we have hit hosts_max_try_hardlimit, we want to behave as if all
5404 hosts were tried. */
5407 if (total_hosts_tried >= ob->hosts_max_try_hardlimit)
5410 debug_printf("hosts_max_try_hardlimit reached: behave as if all "
5411 "hosts were tried\n");
5416 debug_printf("hosts_max_try limit caused some hosts to be skipped\n");
5417 setflag(addr, af_retry_skipped);
5420 if (f.queue_smtp) /* no deliveries attempted */
5422 addr->transport_return = DEFER;
5423 addr->basic_errno = 0;
5424 addr->message = US"SMTP delivery explicitly queued";
5427 else if ( addr->transport_return == DEFER
5428 && (addr->basic_errno == ERRNO_UNKNOWNERROR || addr->basic_errno == 0)
5432 addr->basic_errno = ERRNO_HRETRY;
5433 if (continue_hostname)
5434 addr->message = US"no host found for existing SMTP connection";
5437 setflag(addr, af_pass_message); /* This is not a security risk */
5438 addr->message = string_sprintf(
5439 "all hosts%s have been failing for a long time %s",
5440 addr->domain ? string_sprintf(" for '%s'", addr->domain) : US"",
5441 ob->delay_after_cutoff
5442 ? US"(and retry time not reached)"
5443 : US"and were last tried after this message arrived");
5445 /* If we are already using fallback hosts, or there are no fallback hosts
5446 defined, convert the result to FAIL to cause a bounce. */
5448 if (addr->host_list == addr->fallback_hosts || !addr->fallback_hosts)
5449 addr->transport_return = FAIL;
5454 if (hosts_retry == hosts_total)
5455 s = "retry time not reached for any host%s";
5456 else if (hosts_fail == hosts_total)
5457 s = "all host address lookups%s failed permanently";
5458 else if (hosts_defer == hosts_total)
5459 s = "all host address lookups%s failed temporarily";
5460 else if (hosts_serial == hosts_total)
5461 s = "connection limit reached for all hosts%s";
5462 else if (hosts_fail+hosts_defer == hosts_total)
5463 s = "all host address lookups%s failed";
5465 s = "some host address lookups failed and retry time "
5466 "not reached for other hosts or connection limit reached%s";
5468 addr->message = string_sprintf(s,
5469 addr->domain ? string_sprintf(" for '%s'", addr->domain) : US"");
5474 /* Update the database which keeps information about which messages are waiting
5475 for which hosts to become available. For some message-specific errors, the
5476 update_waiting flag is turned off because we don't want follow-on deliveries in
5477 those cases. If this transport instance is explicitly limited to one message
5478 per connection then follow-on deliveries are not possible and there's no need
5479 to create/update the per-transport wait-<transport_name> database. */
5481 if (update_waiting && tblock->connection_max_messages != 1)
5482 transport_update_waiting(hostlist, tblock->name);
5486 DEBUG(D_transport) debug_printf("Leaving %s transport\n", tblock->name);
5488 return TRUE; /* Each address has its status */
5491 #endif /*!MACRO_PREDEF*/
5494 /* End of transport/smtp.c */