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. */
11 #if defined(SUPPORT_DANE) && defined(DISABLE_TLS)
12 # error TLS is required for DANE
16 /* Options specific to the smtp transport. This transport also supports LMTP
17 over TCP/IP. The options must be in alphabetic order (note that "_" comes
18 before the lower case letters). Some live in the transport_instance block so as
19 to be publicly visible; these are flagged with opt_public. */
21 optionlist smtp_transport_options[] = {
22 { "*expand_multi_domain", opt_stringptr | opt_hidden | opt_public,
23 (void *)offsetof(transport_instance, expand_multi_domain) },
24 { "*expand_retry_include_ip_address", opt_stringptr | opt_hidden,
25 (void *)(offsetof(smtp_transport_options_block, expand_retry_include_ip_address)) },
27 { "address_retry_include_sender", opt_bool,
28 (void *)offsetof(smtp_transport_options_block, address_retry_include_sender) },
29 { "allow_localhost", opt_bool,
30 (void *)offsetof(smtp_transport_options_block, allow_localhost) },
31 #ifdef EXPERIMENTAL_ARC
32 { "arc_sign", opt_stringptr,
33 (void *)offsetof(smtp_transport_options_block, arc_sign) },
35 { "authenticated_sender", opt_stringptr,
36 (void *)offsetof(smtp_transport_options_block, authenticated_sender) },
37 { "authenticated_sender_force", opt_bool,
38 (void *)offsetof(smtp_transport_options_block, authenticated_sender_force) },
39 { "command_timeout", opt_time,
40 (void *)offsetof(smtp_transport_options_block, command_timeout) },
41 { "connect_timeout", opt_time,
42 (void *)offsetof(smtp_transport_options_block, connect_timeout) },
43 { "connection_max_messages", opt_int | opt_public,
44 (void *)offsetof(transport_instance, connection_max_messages) },
46 { "dane_require_tls_ciphers", opt_stringptr,
47 (void *)offsetof(smtp_transport_options_block, dane_require_tls_ciphers) },
49 { "data_timeout", opt_time,
50 (void *)offsetof(smtp_transport_options_block, data_timeout) },
51 { "delay_after_cutoff", opt_bool,
52 (void *)offsetof(smtp_transport_options_block, delay_after_cutoff) },
54 { "dkim_canon", opt_stringptr,
55 (void *)offsetof(smtp_transport_options_block, dkim.dkim_canon) },
56 { "dkim_domain", opt_stringptr,
57 (void *)offsetof(smtp_transport_options_block, dkim.dkim_domain) },
58 { "dkim_hash", opt_stringptr,
59 (void *)offsetof(smtp_transport_options_block, dkim.dkim_hash) },
60 { "dkim_identity", opt_stringptr,
61 (void *)offsetof(smtp_transport_options_block, dkim.dkim_identity) },
62 { "dkim_private_key", opt_stringptr,
63 (void *)offsetof(smtp_transport_options_block, dkim.dkim_private_key) },
64 { "dkim_selector", opt_stringptr,
65 (void *)offsetof(smtp_transport_options_block, dkim.dkim_selector) },
66 { "dkim_sign_headers", opt_stringptr,
67 (void *)offsetof(smtp_transport_options_block, dkim.dkim_sign_headers) },
68 { "dkim_strict", opt_stringptr,
69 (void *)offsetof(smtp_transport_options_block, dkim.dkim_strict) },
70 { "dkim_timestamps", opt_stringptr,
71 (void *)offsetof(smtp_transport_options_block, dkim.dkim_timestamps) },
73 { "dns_qualify_single", opt_bool,
74 (void *)offsetof(smtp_transport_options_block, dns_qualify_single) },
75 { "dns_search_parents", opt_bool,
76 (void *)offsetof(smtp_transport_options_block, dns_search_parents) },
77 { "dnssec_request_domains", opt_stringptr,
78 (void *)offsetof(smtp_transport_options_block, dnssec.request) },
79 { "dnssec_require_domains", opt_stringptr,
80 (void *)offsetof(smtp_transport_options_block, dnssec.require) },
81 { "dscp", opt_stringptr,
82 (void *)offsetof(smtp_transport_options_block, dscp) },
83 { "fallback_hosts", opt_stringptr,
84 (void *)offsetof(smtp_transport_options_block, fallback_hosts) },
85 { "final_timeout", opt_time,
86 (void *)offsetof(smtp_transport_options_block, final_timeout) },
87 { "gethostbyname", opt_bool,
88 (void *)offsetof(smtp_transport_options_block, gethostbyname) },
89 { "helo_data", opt_stringptr,
90 (void *)offsetof(smtp_transport_options_block, helo_data) },
91 { "hosts", opt_stringptr,
92 (void *)offsetof(smtp_transport_options_block, hosts) },
93 { "hosts_avoid_esmtp", opt_stringptr,
94 (void *)offsetof(smtp_transport_options_block, hosts_avoid_esmtp) },
95 { "hosts_avoid_pipelining", opt_stringptr,
96 (void *)offsetof(smtp_transport_options_block, hosts_avoid_pipelining) },
98 { "hosts_avoid_tls", opt_stringptr,
99 (void *)offsetof(smtp_transport_options_block, hosts_avoid_tls) },
101 { "hosts_max_try", opt_int,
102 (void *)offsetof(smtp_transport_options_block, hosts_max_try) },
103 { "hosts_max_try_hardlimit", opt_int,
104 (void *)offsetof(smtp_transport_options_block, hosts_max_try_hardlimit) },
106 { "hosts_nopass_tls", opt_stringptr,
107 (void *)offsetof(smtp_transport_options_block, hosts_nopass_tls) },
108 { "hosts_noproxy_tls", opt_stringptr,
109 (void *)offsetof(smtp_transport_options_block, hosts_noproxy_tls) },
111 { "hosts_override", opt_bool,
112 (void *)offsetof(smtp_transport_options_block, hosts_override) },
113 #ifdef SUPPORT_PIPE_CONNECT
114 { "hosts_pipe_connect", opt_stringptr,
115 (void *)offsetof(smtp_transport_options_block, hosts_pipe_connect) },
117 { "hosts_randomize", opt_bool,
118 (void *)offsetof(smtp_transport_options_block, hosts_randomize) },
119 #if !defined(DISABLE_TLS) && !defined(DISABLE_OCSP)
120 { "hosts_request_ocsp", opt_stringptr,
121 (void *)offsetof(smtp_transport_options_block, hosts_request_ocsp) },
123 { "hosts_require_auth", opt_stringptr,
124 (void *)offsetof(smtp_transport_options_block, hosts_require_auth) },
127 { "hosts_require_dane", opt_stringptr,
128 (void *)offsetof(smtp_transport_options_block, hosts_require_dane) },
130 # ifndef DISABLE_OCSP
131 { "hosts_require_ocsp", opt_stringptr,
132 (void *)offsetof(smtp_transport_options_block, hosts_require_ocsp) },
134 { "hosts_require_tls", opt_stringptr,
135 (void *)offsetof(smtp_transport_options_block, hosts_require_tls) },
137 { "hosts_try_auth", opt_stringptr,
138 (void *)offsetof(smtp_transport_options_block, hosts_try_auth) },
139 { "hosts_try_chunking", opt_stringptr,
140 (void *)offsetof(smtp_transport_options_block, hosts_try_chunking) },
142 { "hosts_try_dane", opt_stringptr,
143 (void *)offsetof(smtp_transport_options_block, hosts_try_dane) },
145 { "hosts_try_fastopen", opt_stringptr,
146 (void *)offsetof(smtp_transport_options_block, hosts_try_fastopen) },
148 { "hosts_try_prdr", opt_stringptr,
149 (void *)offsetof(smtp_transport_options_block, hosts_try_prdr) },
152 { "hosts_verify_avoid_tls", opt_stringptr,
153 (void *)offsetof(smtp_transport_options_block, hosts_verify_avoid_tls) },
155 { "interface", opt_stringptr,
156 (void *)offsetof(smtp_transport_options_block, interface) },
157 { "keepalive", opt_bool,
158 (void *)offsetof(smtp_transport_options_block, keepalive) },
159 { "lmtp_ignore_quota", opt_bool,
160 (void *)offsetof(smtp_transport_options_block, lmtp_ignore_quota) },
161 { "max_rcpt", opt_int | opt_public,
162 (void *)offsetof(transport_instance, max_addresses) },
163 { "multi_domain", opt_expand_bool | opt_public,
164 (void *)offsetof(transport_instance, multi_domain) },
165 { "port", opt_stringptr,
166 (void *)offsetof(smtp_transport_options_block, port) },
167 { "protocol", opt_stringptr,
168 (void *)offsetof(smtp_transport_options_block, protocol) },
169 { "retry_include_ip_address", opt_expand_bool,
170 (void *)offsetof(smtp_transport_options_block, retry_include_ip_address) },
171 { "serialize_hosts", opt_stringptr,
172 (void *)offsetof(smtp_transport_options_block, serialize_hosts) },
173 { "size_addition", opt_int,
174 (void *)offsetof(smtp_transport_options_block, size_addition) },
176 { "socks_proxy", opt_stringptr,
177 (void *)offsetof(smtp_transport_options_block, socks_proxy) },
180 { "tls_certificate", opt_stringptr,
181 (void *)offsetof(smtp_transport_options_block, tls_certificate) },
182 { "tls_crl", opt_stringptr,
183 (void *)offsetof(smtp_transport_options_block, tls_crl) },
184 { "tls_dh_min_bits", opt_int,
185 (void *)offsetof(smtp_transport_options_block, tls_dh_min_bits) },
186 { "tls_privatekey", opt_stringptr,
187 (void *)offsetof(smtp_transport_options_block, tls_privatekey) },
188 { "tls_require_ciphers", opt_stringptr,
189 (void *)offsetof(smtp_transport_options_block, tls_require_ciphers) },
190 # ifdef EXPERIMENTAL_TLS_RESUME
191 { "tls_resumption_hosts", opt_stringptr,
192 (void *)offsetof(smtp_transport_options_block, tls_resumption_hosts) },
194 { "tls_sni", opt_stringptr,
195 (void *)offsetof(smtp_transport_options_block, tls_sni) },
196 { "tls_tempfail_tryclear", opt_bool,
197 (void *)offsetof(smtp_transport_options_block, tls_tempfail_tryclear) },
198 { "tls_try_verify_hosts", opt_stringptr,
199 (void *)offsetof(smtp_transport_options_block, tls_try_verify_hosts) },
200 { "tls_verify_cert_hostnames", opt_stringptr,
201 (void *)offsetof(smtp_transport_options_block,tls_verify_cert_hostnames)},
202 { "tls_verify_certificates", opt_stringptr,
203 (void *)offsetof(smtp_transport_options_block, tls_verify_certificates) },
204 { "tls_verify_hosts", opt_stringptr,
205 (void *)offsetof(smtp_transport_options_block, tls_verify_hosts) },
208 { "utf8_downconvert", opt_stringptr,
209 (void *)offsetof(smtp_transport_options_block, utf8_downconvert) },
213 /* Size of the options list. An extern variable has to be used so that its
214 address can appear in the tables drtables.c. */
216 int smtp_transport_options_count = nelem(smtp_transport_options);
222 smtp_transport_options_block smtp_transport_option_defaults = {0};
223 void smtp_transport_init(transport_instance *tblock) {}
224 BOOL smtp_transport_entry(transport_instance *tblock, address_item *addr) {return FALSE;}
225 void smtp_transport_closedown(transport_instance *tblock) {}
227 #else /*!MACRO_PREDEF*/
230 /* Default private options block for the smtp transport. */
232 smtp_transport_options_block smtp_transport_option_defaults = {
234 .fallback_hosts = NULL,
236 .fallback_hostlist = NULL,
237 .helo_data = US"$primary_hostname",
240 .protocol = US"smtp",
242 .serialize_hosts = NULL,
243 .hosts_try_auth = NULL,
244 .hosts_require_auth = NULL,
245 .hosts_try_chunking = US"*",
247 .hosts_try_dane = US"*",
248 .hosts_require_dane = NULL,
249 .dane_require_tls_ciphers = NULL,
251 .hosts_try_fastopen = US"*",
253 .hosts_try_prdr = US"*",
256 .hosts_request_ocsp = US"*", /* hosts_request_ocsp (except under DANE; tls_client_start()) */
257 .hosts_require_ocsp = NULL,
259 .hosts_require_tls = NULL,
260 .hosts_avoid_tls = NULL,
261 .hosts_verify_avoid_tls = NULL,
262 .hosts_avoid_pipelining = NULL,
263 #ifdef SUPPORT_PIPE_CONNECT
264 .hosts_pipe_connect = NULL,
266 .hosts_avoid_esmtp = NULL,
268 .hosts_nopass_tls = NULL,
269 .hosts_noproxy_tls = NULL,
271 .command_timeout = 5*60,
272 .connect_timeout = 5*60,
273 .data_timeout = 5*60,
274 .final_timeout = 10*60,
275 .size_addition = 1024,
277 .hosts_max_try_hardlimit = 50,
278 .address_retry_include_sender = TRUE,
279 .allow_localhost = FALSE,
280 .authenticated_sender_force = FALSE,
281 .gethostbyname = FALSE,
282 .dns_qualify_single = TRUE,
283 .dns_search_parents = FALSE,
284 .dnssec = { .request=NULL, .require=NULL },
285 .delay_after_cutoff = TRUE,
286 .hosts_override = FALSE,
287 .hosts_randomize = FALSE,
289 .lmtp_ignore_quota = FALSE,
290 .expand_retry_include_ip_address = NULL,
291 .retry_include_ip_address = TRUE,
296 .tls_certificate = NULL,
298 .tls_privatekey = NULL,
299 .tls_require_ciphers = NULL,
301 .tls_verify_certificates = US"system",
302 .tls_dh_min_bits = EXIM_CLIENT_DH_DEFAULT_MIN_BITS,
303 .tls_tempfail_tryclear = TRUE,
304 # ifdef EXPERIMENTAL_TLS_RESUME
305 .tls_resumption_hosts = NULL,
307 .tls_verify_hosts = NULL,
308 .tls_try_verify_hosts = US"*",
309 .tls_verify_cert_hostnames = US"*",
312 .utf8_downconvert = NULL,
316 {.dkim_domain = NULL,
317 .dkim_identity = NULL,
318 .dkim_private_key = NULL,
319 .dkim_selector = NULL,
321 .dkim_sign_headers = NULL,
323 .dkim_hash = US"sha256",
324 .dkim_timestamps = NULL,
325 .dot_stuffed = FALSE,
326 .force_bodyhash = FALSE,
327 # ifdef EXPERIMENTAL_ARC
328 .arc_signspec = NULL,
331 # ifdef EXPERIMENTAL_ARC
337 /* some DSN flags for use later */
339 static int rf_list[] = {rf_notify_never, rf_notify_success,
340 rf_notify_failure, rf_notify_delay };
342 static uschar *rf_names[] = { US"NEVER", US"SUCCESS", US"FAILURE", US"DELAY" };
348 static uschar *smtp_command; /* Points to last cmd for error messages */
349 static uschar *mail_command; /* Points to MAIL cmd for error messages */
350 static uschar *data_command = US""; /* Points to DATA cmd for error messages */
351 static BOOL update_waiting; /* TRUE to update the "wait" database */
353 /*XXX move to smtp_context */
354 static BOOL pipelining_active; /* current transaction is in pipe mode */
357 static unsigned ehlo_response(uschar * buf, unsigned checks);
360 /*************************************************
361 * Setup entry point *
362 *************************************************/
364 /* This function is called when the transport is about to be used,
365 but before running it in a sub-process. It is used for two things:
367 (1) To set the fallback host list in addresses, when delivering.
368 (2) To pass back the interface, port, protocol, and other options, for use
369 during callout verification.
372 tblock pointer to the transport instance block
373 addrlist list of addresses about to be transported
374 tf if not NULL, pointer to block in which to return options
375 uid the uid that will be set (not used)
376 gid the gid that will be set (not used)
377 errmsg place for error message (not used)
379 Returns: OK always (FAIL, DEFER not used)
383 smtp_transport_setup(transport_instance *tblock, address_item *addrlist,
384 transport_feedback *tf, uid_t uid, gid_t gid, uschar **errmsg)
386 smtp_transport_options_block *ob = SOB tblock->options_block;
388 errmsg = errmsg; /* Keep picky compilers happy */
392 /* Pass back options if required. This interface is getting very messy. */
396 tf->interface = ob->interface;
398 tf->protocol = ob->protocol;
399 tf->hosts = ob->hosts;
400 tf->hosts_override = ob->hosts_override;
401 tf->hosts_randomize = ob->hosts_randomize;
402 tf->gethostbyname = ob->gethostbyname;
403 tf->qualify_single = ob->dns_qualify_single;
404 tf->search_parents = ob->dns_search_parents;
405 tf->helo_data = ob->helo_data;
408 /* Set the fallback host list for all the addresses that don't have fallback
409 host lists, provided that the local host wasn't present in the original host
412 if (!testflag(addrlist, af_local_host_removed))
413 for (; addrlist; addrlist = addrlist->next)
414 if (!addrlist->fallback_hosts) addrlist->fallback_hosts = ob->fallback_hostlist;
421 /*************************************************
422 * Initialization entry point *
423 *************************************************/
425 /* Called for each instance, after its options have been read, to
426 enable consistency checks to be done, or anything else that needs
429 Argument: pointer to the transport instance block
434 smtp_transport_init(transport_instance *tblock)
436 smtp_transport_options_block *ob = SOB tblock->options_block;
438 /* Retry_use_local_part defaults FALSE if unset */
440 if (tblock->retry_use_local_part == TRUE_UNSET)
441 tblock->retry_use_local_part = FALSE;
443 /* Set the default port according to the protocol */
446 ob->port = strcmpic(ob->protocol, US"lmtp") == 0
448 : strcmpic(ob->protocol, US"smtps") == 0
449 ? US"smtps" : US"smtp";
451 /* Set up the setup entry point, to be called before subprocesses for this
454 tblock->setup = smtp_transport_setup;
456 /* Complain if any of the timeouts are zero. */
458 if (ob->command_timeout <= 0 || ob->data_timeout <= 0 ||
459 ob->final_timeout <= 0)
460 log_write(0, LOG_PANIC_DIE|LOG_CONFIG,
461 "command, data, or final timeout value is zero for %s transport",
464 /* If hosts_override is set and there are local hosts, set the global
465 flag that stops verify from showing router hosts. */
467 if (ob->hosts_override && ob->hosts != NULL) tblock->overrides_hosts = TRUE;
469 /* If there are any fallback hosts listed, build a chain of host items
470 for them, but do not do any lookups at this time. */
472 host_build_hostlist(&(ob->fallback_hostlist), ob->fallback_hosts, FALSE);
479 /*************************************************
480 * Set delivery info into all active addresses *
481 *************************************************/
483 /* Only addresses whose status is >= PENDING are relevant. A lesser
484 status means that an address is not currently being processed.
487 addrlist points to a chain of addresses
488 errno_value to put in each address's errno field
489 msg to put in each address's message field
490 rc to put in each address's transport_return field
491 pass_message if TRUE, set the "pass message" flag in the address
492 host if set, mark addrs as having used this host
493 smtp_greeting from peer
494 helo_response from peer
496 If errno_value has the special value ERRNO_CONNECTTIMEOUT, ETIMEDOUT is put in
497 the errno field, and RTEF_CTOUT is ORed into the more_errno field, to indicate
498 this particular type of timeout.
504 set_errno(address_item *addrlist, int errno_value, uschar *msg, int rc,
505 BOOL pass_message, host_item * host
506 #ifdef EXPERIMENTAL_DSN_INFO
507 , const uschar * smtp_greeting, const uschar * helo_response
512 if (errno_value == ERRNO_CONNECTTIMEOUT)
514 errno_value = ETIMEDOUT;
515 orvalue = RTEF_CTOUT;
517 for (address_item * addr = addrlist; addr; addr = addr->next)
518 if (addr->transport_return >= PENDING)
520 addr->basic_errno = errno_value;
521 addr->more_errno |= orvalue;
525 if (pass_message) setflag(addr, af_pass_message);
527 addr->transport_return = rc;
530 addr->host_used = host;
531 #ifdef EXPERIMENTAL_DSN_INFO
533 {uschar * s = Ustrchr(smtp_greeting, '\n'); if (s) *s = '\0';}
534 addr->smtp_greeting = smtp_greeting;
537 {uschar * s = Ustrchr(helo_response, '\n'); if (s) *s = '\0';}
538 addr->helo_response = helo_response;
545 set_errno_nohost(address_item *addrlist, int errno_value, uschar *msg, int rc,
548 set_errno(addrlist, errno_value, msg, rc, pass_message, NULL
549 #ifdef EXPERIMENTAL_DSN_INFO
556 /*************************************************
557 * Check an SMTP response *
558 *************************************************/
560 /* This function is given an errno code and the SMTP response buffer
561 to analyse, together with the host identification for generating messages. It
562 sets an appropriate message and puts the first digit of the response code into
563 the yield variable. If no response was actually read, a suitable digit is
567 host the current host, to get its name for messages
568 errno_value pointer to the errno value
569 more_errno from the top address for use with ERRNO_FILTER_FAIL
570 buffer the SMTP response buffer
571 yield where to put a one-digit SMTP response code
572 message where to put an error message
573 pass_message set TRUE if message is an SMTP response
575 Returns: TRUE if an SMTP "QUIT" command should be sent, else FALSE
579 check_response(host_item *host, int *errno_value, int more_errno,
580 uschar *buffer, int *yield, uschar **message, BOOL *pass_message)
582 uschar * pl = pipelining_active ? US"pipelined " : US"";
585 *yield = '4'; /* Default setting is to give a temporary error */
589 case ETIMEDOUT: /* Handle response timeout */
590 *message = US string_sprintf("SMTP timeout after %s%s",
592 if (transport_count > 0)
593 *message = US string_sprintf("%s (%d bytes written)", *message,
597 case ERRNO_SMTPFORMAT: /* Handle malformed SMTP response */
598 s = string_printing(buffer);
599 while (isspace(*s)) s++;
601 ? string_sprintf("Malformed SMTP reply (an empty line) "
602 "in response to %s%s", pl, smtp_command)
603 : string_sprintf("Malformed SMTP reply in response to %s%s: %s",
604 pl, smtp_command, s);
607 case ERRNO_TLSFAILURE: /* Handle bad first read; can happen with
609 *message = US"bad first read from TLS conn";
612 case ERRNO_FILTER_FAIL: /* Handle a failed filter process error;
613 can't send QUIT as we mustn't end the DATA. */
614 *message = string_sprintf("transport filter process failed (%d)%s",
616 more_errno == EX_EXECFAILED ? ": unable to execute command" : "");
619 case ERRNO_CHHEADER_FAIL: /* Handle a failed add_headers expansion;
620 can't send QUIT as we mustn't end the DATA. */
622 string_sprintf("failed to expand headers_add or headers_remove: %s",
623 expand_string_message);
626 case ERRNO_WRITEINCOMPLETE: /* failure to write a complete data block */
627 *message = US"failed to write a data block";
631 case ERRNO_UTF8_FWD: /* no advertised SMTPUTF8, for international message */
632 *message = US"utf8 support required but not offered for forwarding";
633 DEBUG(D_deliver|D_transport) debug_printf("%s\n", *message);
638 /* Handle error responses from the remote mailer. */
642 *message = string_sprintf("SMTP error from remote mail server after %s%s: "
643 "%s", pl, smtp_command, s = string_printing(buffer));
644 *pass_message = TRUE;
649 /* No data was read. If there is no errno, this must be the EOF (i.e.
650 connection closed) case, which causes deferral. An explicit connection reset
651 error has the same effect. Otherwise, put the host's identity in the message,
652 leaving the errno value to be interpreted as well. In all cases, we have to
653 assume the connection is now dead. */
655 if (*errno_value == 0 || *errno_value == ECONNRESET)
657 *errno_value = ERRNO_SMTPCLOSED;
658 *message = US string_sprintf("Remote host closed connection "
659 "in response to %s%s", pl, smtp_command);
662 *message = US string_sprintf("%s [%s]", host->name, host->address);
669 /*************************************************
670 * Write error message to logs *
671 *************************************************/
673 /* This writes to the main log and to the message log.
676 host the current host
677 detail the current message (addr_item->message)
678 basic_errno the errno (addr_item->basic_errno)
684 write_logs(const host_item *host, const uschar *suffix, int basic_errno)
686 gstring * message = LOGGING(outgoing_port)
687 ? string_fmt_append(NULL, "H=%s [%s]:%d", host->name, host->address,
688 host->port == PORT_NONE ? 25 : host->port)
689 : string_fmt_append(NULL, "H=%s [%s]", host->name, host->address);
693 message = string_fmt_append(message, ": %s", suffix);
695 message = string_fmt_append(message, ": %s", strerror(basic_errno));
698 message = string_fmt_append(message, " %s", exim_errstr(basic_errno));
700 log_write(0, LOG_MAIN, "%s", string_from_gstring(message));
701 deliver_msglog("%s %s\n", tod_stamp(tod_log), message->s);
705 msglog_line(host_item * host, uschar * message)
707 deliver_msglog("%s H=%s [%s] %s\n", tod_stamp(tod_log),
708 host->name, host->address, message);
713 #ifndef DISABLE_EVENT
714 /*************************************************
715 * Post-defer action *
716 *************************************************/
718 /* This expands an arbitrary per-transport string.
719 It might, for example, be used to write to the database log.
722 addr the address item containing error information
723 host the current host
729 deferred_event_raise(address_item *addr, host_item *host)
731 uschar * action = addr->transport->event_action;
732 const uschar * save_domain;
738 save_domain = deliver_domain;
739 save_local = deliver_localpart;
741 /*XXX would ip & port already be set up? */
742 deliver_host_address = string_copy(host->address);
743 deliver_host_port = host->port == PORT_NONE ? 25 : host->port;
744 event_defer_errno = addr->basic_errno;
746 router_name = addr->router->name;
747 transport_name = addr->transport->name;
748 deliver_domain = addr->domain;
749 deliver_localpart = addr->local_part;
751 (void) event_raise(action, US"msg:host:defer",
753 ? addr->basic_errno > 0
754 ? string_sprintf("%s: %s", addr->message, strerror(addr->basic_errno))
755 : string_copy(addr->message)
756 : addr->basic_errno > 0
757 ? string_copy(US strerror(addr->basic_errno))
760 deliver_localpart = save_local;
761 deliver_domain = save_domain;
762 router_name = transport_name = NULL;
766 /*************************************************
767 * Reap SMTP specific responses *
768 *************************************************/
770 smtp_discard_responses(smtp_context * sx, smtp_transport_options_block * ob,
773 uschar flushbuffer[4096];
777 if (!smtp_read_response(sx, flushbuffer, sizeof(flushbuffer),
778 '2', ob->command_timeout)
779 && (errno != 0 || flushbuffer[0] == 0))
786 /* Return boolean success */
789 smtp_reap_banner(smtp_context * sx)
791 BOOL good_response = smtp_read_response(sx, sx->buffer, sizeof(sx->buffer),
792 '2', (SOB sx->conn_args.ob)->command_timeout);
793 #ifdef EXPERIMENTAL_DSN_INFO
794 sx->smtp_greeting = string_copy(sx->buffer);
796 return good_response;
800 smtp_reap_ehlo(smtp_context * sx)
802 if (!smtp_read_response(sx, sx->buffer, sizeof(sx->buffer), '2',
803 (SOB sx->conn_args.ob)->command_timeout))
805 if (errno != 0 || sx->buffer[0] == 0 || sx->lmtp)
807 #ifdef EXPERIMENTAL_DSN_INFO
808 sx->helo_response = string_copy(sx->buffer);
814 #ifdef EXPERIMENTAL_DSN_INFO
815 sx->helo_response = string_copy(sx->buffer);
822 #ifdef SUPPORT_PIPE_CONNECT
824 ehlo_cache_key(const smtp_context * sx)
826 host_item * host = sx->conn_args.host;
827 return Ustrchr(host->address, ':')
828 ? string_sprintf("[%s]:%d.EHLO", host->address,
829 host->port == PORT_NONE ? sx->port : host->port)
830 : string_sprintf("%s:%d.EHLO", host->address,
831 host->port == PORT_NONE ? sx->port : host->port);
835 write_ehlo_cache_entry(const smtp_context * sx)
837 open_db dbblock, * dbm_file;
839 if ((dbm_file = dbfn_open(US"misc", O_RDWR, &dbblock, TRUE, TRUE)))
841 uschar * ehlo_resp_key = ehlo_cache_key(sx);
842 dbdata_ehlo_resp er = { .data = sx->ehlo_resp };
844 HDEBUG(D_transport) debug_printf("writing clr %04x/%04x cry %04x/%04x\n",
845 sx->ehlo_resp.cleartext_features, sx->ehlo_resp.cleartext_auths,
846 sx->ehlo_resp.crypted_features, sx->ehlo_resp.crypted_auths);
848 dbfn_write(dbm_file, ehlo_resp_key, &er, (int)sizeof(er));
849 dbfn_close(dbm_file);
854 invalidate_ehlo_cache_entry(smtp_context * sx)
856 open_db dbblock, * dbm_file;
858 if ( sx->early_pipe_active
859 && (dbm_file = dbfn_open(US"misc", O_RDWR, &dbblock, TRUE, TRUE)))
861 uschar * ehlo_resp_key = ehlo_cache_key(sx);
862 dbfn_delete(dbm_file, ehlo_resp_key);
863 dbfn_close(dbm_file);
868 read_ehlo_cache_entry(smtp_context * sx)
873 if (!(dbm_file = dbfn_open(US"misc", O_RDONLY, &dbblock, FALSE, TRUE)))
874 { DEBUG(D_transport) debug_printf("ehlo-cache: no misc DB\n"); }
877 uschar * ehlo_resp_key = ehlo_cache_key(sx);
878 dbdata_ehlo_resp * er;
880 if (!(er = dbfn_read(dbm_file, ehlo_resp_key)))
881 { DEBUG(D_transport) debug_printf("no ehlo-resp record\n"); }
882 else if (time(NULL) - er->time_stamp > retry_data_expire)
884 DEBUG(D_transport) debug_printf("ehlo-resp record too old\n");
885 dbfn_close(dbm_file);
886 if ((dbm_file = dbfn_open(US"misc", O_RDWR, &dbblock, TRUE, TRUE)))
887 dbfn_delete(dbm_file, ehlo_resp_key);
891 sx->ehlo_resp = er->data;
892 dbfn_close(dbm_file);
893 DEBUG(D_transport) debug_printf(
894 "EHLO response bits from cache: cleartext 0x%04x crypted 0x%04x\n",
895 er->data.cleartext_features, er->data.crypted_features);
898 dbfn_close(dbm_file);
905 /* Return an auths bitmap for the set of AUTH methods offered by the server
906 which match our authenticators. */
908 static unsigned short
909 study_ehlo_auths(smtp_context * sx)
914 unsigned short authbits = 0;
916 if (!sx->esmtp) return 0;
917 if (!regex_AUTH) regex_AUTH = regex_must_compile(AUTHS_REGEX, FALSE, TRUE);
918 if (!regex_match_and_setup(regex_AUTH, sx->buffer, 0, -1)) return 0;
919 expand_nmax = -1; /* reset */
920 names = string_copyn(expand_nstring[1], expand_nlength[1]);
922 for (au = auths, authnum = 0; au; au = au->next, authnum++) if (au->client)
924 const uschar * list = names;
928 while (string_nextinlist(&list, &sep, name, sizeof(name)))
929 if (strcmpic(au->public_name, name) == 0)
930 { authbits |= BIT(authnum); break; }
934 debug_printf("server offers %s AUTH, methods '%s', bitmap 0x%04x\n",
935 tls_out.active.sock >= 0 ? "crypted" : "plaintext", names, authbits);
937 if (tls_out.active.sock >= 0)
938 sx->ehlo_resp.crypted_auths = authbits;
940 sx->ehlo_resp.cleartext_auths = authbits;
947 /* Wait for and check responses for early-pipelining.
949 Called from the lower-level smtp_read_response() function
950 used for general code that assume synchronisation, if context
951 flags indicate outstanding early-pipelining commands. Also
952 called fom sync_responses() which handles pipelined commands.
955 sx smtp connection context
956 countp number of outstanding responses, adjusted on return
960 DEFER error on first read of TLS'd conn
961 FAIL SMTP error in response
964 smtp_reap_early_pipe(smtp_context * sx, int * countp)
966 BOOL pending_BANNER = sx->pending_BANNER;
967 BOOL pending_EHLO = sx->pending_EHLO;
970 sx->pending_BANNER = FALSE; /* clear early to avoid recursion */
971 sx->pending_EHLO = FALSE;
975 DEBUG(D_transport) debug_printf("%s expect banner\n", __FUNCTION__);
977 if (!smtp_reap_banner(sx))
979 DEBUG(D_transport) debug_printf("bad banner\n");
980 if (tls_out.active.sock >= 0) rc = DEFER;
987 unsigned peer_offered;
988 unsigned short authbits = 0, * ap;
990 DEBUG(D_transport) debug_printf("%s expect ehlo\n", __FUNCTION__);
992 if (!smtp_reap_ehlo(sx))
994 DEBUG(D_transport) debug_printf("bad response for EHLO\n");
995 if (tls_out.active.sock >= 0) rc = DEFER;
999 /* Compare the actual EHLO response to the cached value we assumed;
1000 on difference, dump or rewrite the cache and arrange for a retry. */
1002 ap = tls_out.active.sock < 0
1003 ? &sx->ehlo_resp.cleartext_auths : &sx->ehlo_resp.crypted_auths;
1005 peer_offered = ehlo_response(sx->buffer,
1006 (tls_out.active.sock < 0 ? OPTION_TLS : 0)
1007 | OPTION_CHUNKING | OPTION_PRDR | OPTION_DSN | OPTION_PIPE | OPTION_SIZE
1008 | OPTION_UTF8 | OPTION_EARLY_PIPE
1010 if ( peer_offered != sx->peer_offered
1011 || (authbits = study_ehlo_auths(sx)) != *ap)
1014 debug_printf("EHLO %s extensions changed, 0x%04x/0x%04x -> 0x%04x/0x%04x\n",
1015 tls_out.active.sock < 0 ? "cleartext" : "crypted",
1016 sx->peer_offered, *ap, peer_offered, authbits);
1017 *(tls_out.active.sock < 0
1018 ? &sx->ehlo_resp.cleartext_features : &sx->ehlo_resp.crypted_features) = peer_offered;
1020 if (peer_offered & OPTION_EARLY_PIPE)
1021 write_ehlo_cache_entry(sx);
1023 invalidate_ehlo_cache_entry(sx);
1025 return OK; /* just carry on */
1031 invalidate_ehlo_cache_entry(sx);
1032 (void) smtp_discard_responses(sx, sx->conn_args.ob, *countp);
1038 /*************************************************
1039 * Synchronize SMTP responses *
1040 *************************************************/
1042 /* This function is called from smtp_deliver() to receive SMTP responses from
1043 the server, and match them up with the commands to which they relate. When
1044 PIPELINING is not in use, this function is called after every command, and is
1045 therefore somewhat over-engineered, but it is simpler to use a single scheme
1046 that works both with and without PIPELINING instead of having two separate sets
1049 The set of commands that are buffered up with pipelining may start with MAIL
1050 and may end with DATA; in between are RCPT commands that correspond to the
1051 addresses whose status is PENDING_DEFER. All other commands (STARTTLS, AUTH,
1052 etc.) are never buffered.
1054 Errors after MAIL or DATA abort the whole process leaving the response in the
1055 buffer. After MAIL, pending responses are flushed, and the original command is
1056 re-instated in big_buffer for error messages. For RCPT commands, the remote is
1057 permitted to reject some recipient addresses while accepting others. However
1058 certain errors clearly abort the whole process. Set the value in
1059 transport_return to PENDING_OK if the address is accepted. If there is a
1060 subsequent general error, it will get reset accordingly. If not, it will get
1061 converted to OK at the end.
1064 sx smtp connection context
1065 count the number of responses to read
1066 pending_DATA 0 if last command sent was not DATA
1067 +1 if previously had a good recipient
1068 -1 if not previously had a good recipient
1070 Returns: 3 if at least one address had 2xx and one had 5xx
1071 2 if at least one address had 5xx but none had 2xx
1072 1 if at least one host had a 2xx response, but none had 5xx
1073 0 no address had 2xx or 5xx but no errors (all 4xx, or just DATA)
1074 -1 timeout while reading RCPT response
1075 -2 I/O or other non-response error for RCPT
1076 -3 DATA or MAIL failed - errno and buffer set
1077 -4 banner or EHLO failed (early-pipelining)
1078 -5 banner or EHLO failed (early-pipelining, TLS)
1082 sync_responses(smtp_context * sx, int count, int pending_DATA)
1084 address_item * addr = sx->sync_addr;
1085 smtp_transport_options_block * ob = sx->conn_args.ob;
1088 #ifdef SUPPORT_PIPE_CONNECT
1090 if ((rc = smtp_reap_early_pipe(sx, &count)) != OK)
1091 return rc == FAIL ? -4 : -5;
1094 /* Handle the response for a MAIL command. On error, reinstate the original
1095 command in big_buffer for error message use, and flush any further pending
1096 responses before returning, except after I/O errors and timeouts. */
1098 if (sx->pending_MAIL)
1100 DEBUG(D_transport) debug_printf("%s expect mail\n", __FUNCTION__);
1102 if (!smtp_read_response(sx, sx->buffer, sizeof(sx->buffer),
1103 '2', ob->command_timeout))
1105 DEBUG(D_transport) debug_printf("bad response for MAIL\n");
1106 Ustrcpy(big_buffer, mail_command); /* Fits, because it came from there! */
1107 if (errno == ERRNO_TLSFAILURE)
1109 if (errno == 0 && sx->buffer[0] != 0)
1112 if (sx->buffer[0] == '4')
1114 save_errno = ERRNO_MAIL4XX;
1115 addr->more_errno |= ((sx->buffer[1] - '0')*10 + sx->buffer[2] - '0') << 8;
1117 count = smtp_discard_responses(sx, ob, count);
1121 if (pending_DATA) count--; /* Number of RCPT responses to come */
1122 while (count-- > 0) /* Mark any pending addrs with the host used */
1124 while (addr->transport_return != PENDING_DEFER) addr = addr->next;
1125 addr->host_used = sx->conn_args.host;
1132 if (pending_DATA) count--; /* Number of RCPT responses to come */
1134 /* Read and handle the required number of RCPT responses, matching each one up
1135 with an address by scanning for the next address whose status is PENDING_DEFER.
1140 while (addr->transport_return != PENDING_DEFER)
1141 if (!(addr = addr->next))
1144 /* The address was accepted */
1145 addr->host_used = sx->conn_args.host;
1147 DEBUG(D_transport) debug_printf("%s expect rcpt\n", __FUNCTION__);
1148 if (smtp_read_response(sx, sx->buffer, sizeof(sx->buffer),
1149 '2', ob->command_timeout))
1152 addr->transport_return = PENDING_OK;
1154 /* If af_dr_retry_exists is set, there was a routing delay on this address;
1155 ensure that any address-specific retry record is expunged. We do this both
1156 for the basic key and for the version that also includes the sender. */
1158 if (testflag(addr, af_dr_retry_exists))
1160 uschar *altkey = string_sprintf("%s:<%s>", addr->address_retry_key,
1162 retry_add_item(addr, altkey, rf_delete);
1163 retry_add_item(addr, addr->address_retry_key, rf_delete);
1167 /* Error on first TLS read */
1169 else if (errno == ERRNO_TLSFAILURE)
1172 /* Timeout while reading the response */
1174 else if (errno == ETIMEDOUT)
1176 uschar *message = string_sprintf("SMTP timeout after RCPT TO:<%s>",
1177 transport_rcpt_address(addr, sx->conn_args.tblock->rcpt_include_affixes));
1178 set_errno_nohost(sx->first_addr, ETIMEDOUT, message, DEFER, FALSE);
1179 retry_add_item(addr, addr->address_retry_key, 0);
1180 update_waiting = FALSE;
1184 /* Handle other errors in obtaining an SMTP response by returning -1. This
1185 will cause all the addresses to be deferred. Restore the SMTP command in
1186 big_buffer for which we are checking the response, so the error message
1189 else if (errno != 0 || sx->buffer[0] == 0)
1191 gstring gs = { .size = big_buffer_size, .ptr = 0, .s = big_buffer }, * g = &gs;
1193 /* Use taint-unchecked routines for writing into big_buffer, trusting
1194 that we'll never expand it. */
1196 g = string_fmt_append_f(g, SVFMT_TAINT_NOCHK, "RCPT TO:<%s>",
1197 transport_rcpt_address(addr, sx->conn_args.tblock->rcpt_include_affixes));
1198 string_from_gstring(g);
1202 /* Handle SMTP permanent and temporary response codes. */
1207 string_sprintf("SMTP error from remote mail server after RCPT TO:<%s>: "
1208 "%s", transport_rcpt_address(addr, sx->conn_args.tblock->rcpt_include_affixes),
1209 string_printing(sx->buffer));
1210 setflag(addr, af_pass_message);
1212 msglog_line(sx->conn_args.host, addr->message);
1214 /* The response was 5xx */
1216 if (sx->buffer[0] == '5')
1218 addr->transport_return = FAIL;
1222 /* The response was 4xx */
1226 addr->transport_return = DEFER;
1227 addr->basic_errno = ERRNO_RCPT4XX;
1228 addr->more_errno |= ((sx->buffer[1] - '0')*10 + sx->buffer[2] - '0') << 8;
1232 #ifndef DISABLE_EVENT
1233 event_defer_errno = addr->more_errno;
1234 msg_event_raise(US"msg:rcpt:host:defer", addr);
1237 /* Log temporary errors if there are more hosts to be tried.
1238 If not, log this last one in the == line. */
1240 if (sx->conn_args.host->next)
1241 if (LOGGING(outgoing_port))
1242 log_write(0, LOG_MAIN, "H=%s [%s]:%d %s", sx->conn_args.host->name,
1243 sx->conn_args.host->address,
1244 sx->port == PORT_NONE ? 25 : sx->port, addr->message);
1246 log_write(0, LOG_MAIN, "H=%s [%s]: %s", sx->conn_args.host->name,
1247 sx->conn_args.host->address, addr->message);
1249 #ifndef DISABLE_EVENT
1251 msg_event_raise(US"msg:rcpt:defer", addr);
1254 /* Do not put this message on the list of those waiting for specific
1255 hosts, as otherwise it is likely to be tried too often. */
1257 update_waiting = FALSE;
1259 /* Add a retry item for the address so that it doesn't get tried again
1260 too soon. If address_retry_include_sender is true, add the sender address
1261 to the retry key. */
1263 retry_add_item(addr,
1264 ob->address_retry_include_sender
1265 ? string_sprintf("%s:<%s>", addr->address_retry_key, sender_address)
1266 : addr->address_retry_key,
1271 } /* Loop for next RCPT response */
1273 /* Update where to start at for the next block of responses, unless we
1274 have already handled all the addresses. */
1276 if (addr) sx->sync_addr = addr->next;
1278 /* Handle a response to DATA. If we have not had any good recipients, either
1279 previously or in this block, the response is ignored. */
1281 if (pending_DATA != 0)
1283 DEBUG(D_transport) debug_printf("%s expect data\n", __FUNCTION__);
1284 if (!smtp_read_response(sx, sx->buffer, sizeof(sx->buffer),
1285 '3', ob->command_timeout))
1291 if (errno == ERRNO_TLSFAILURE) /* Error on first TLS read */
1294 if (pending_DATA > 0 || (yield & 1) != 0)
1296 if (errno == 0 && sx->buffer[0] == '4')
1298 errno = ERRNO_DATA4XX;
1299 sx->first_addr->more_errno |= ((sx->buffer[1] - '0')*10 + sx->buffer[2] - '0') << 8;
1303 (void)check_response(sx->conn_args.host, &errno, 0, sx->buffer, &code, &msg, &pass_message);
1304 DEBUG(D_transport) debug_printf("%s\nerror for DATA ignored: pipelining "
1305 "is in use and there were no good recipients\n", msg);
1309 /* All responses read and handled; MAIL (if present) received 2xx and DATA (if
1310 present) received 3xx. If any RCPTs were handled and yielded anything other
1311 than 4xx, yield will be set non-zero. */
1320 /* Try an authenticator's client entry */
1323 try_authenticator(smtp_context * sx, auth_instance * au)
1325 smtp_transport_options_block * ob = sx->conn_args.ob; /* transport options */
1326 host_item * host = sx->conn_args.host; /* host to deliver to */
1329 sx->outblock.authenticating = TRUE;
1330 rc = (au->info->clientcode)(au, sx, ob->command_timeout,
1331 sx->buffer, sizeof(sx->buffer));
1332 sx->outblock.authenticating = FALSE;
1333 DEBUG(D_transport) debug_printf("%s authenticator yielded %d\n", au->name, rc);
1335 /* A temporary authentication failure must hold up delivery to
1336 this host. After a permanent authentication failure, we carry on
1337 to try other authentication methods. If all fail hard, try to
1338 deliver the message unauthenticated unless require_auth was set. */
1343 f.smtp_authenticated = TRUE; /* stops the outer loop */
1344 client_authenticator = au->name;
1345 if (au->set_client_id)
1346 client_authenticated_id = expand_string(au->set_client_id);
1349 /* Failure after writing a command */
1354 /* Failure after reading a response */
1357 if (errno != 0 || sx->buffer[0] != '5') return FAIL;
1358 log_write(0, LOG_MAIN, "%s authenticator failed H=%s [%s] %s",
1359 au->name, host->name, host->address, sx->buffer);
1362 /* Failure by some other means. In effect, the authenticator
1363 decided it wasn't prepared to handle this case. Typically this
1364 is the result of "fail" in an expansion string. Do we need to
1365 log anything here? Feb 2006: a message is now put in the buffer
1366 if logging is required. */
1369 if (*sx->buffer != 0)
1370 log_write(0, LOG_MAIN, "%s authenticator cancelled "
1371 "authentication H=%s [%s] %s", au->name, host->name,
1372 host->address, sx->buffer);
1375 /* Internal problem, message in buffer. */
1378 set_errno_nohost(sx->addrlist, ERRNO_AUTHPROB, string_copy(sx->buffer),
1388 /* Do the client side of smtp-level authentication.
1391 sx smtp connection context
1393 sx->buffer should have the EHLO response from server (gets overwritten)
1396 OK Success, or failed (but not required): global "smtp_authenticated" set
1397 DEFER Failed authentication (and was required)
1398 ERROR Internal problem
1400 FAIL_SEND Failed communications - transmit
1405 smtp_auth(smtp_context * sx)
1407 host_item * host = sx->conn_args.host; /* host to deliver to */
1408 smtp_transport_options_block * ob = sx->conn_args.ob; /* transport options */
1409 int require_auth = verify_check_given_host(CUSS &ob->hosts_require_auth, host);
1410 #ifdef SUPPORT_PIPE_CONNECT
1411 unsigned short authbits = tls_out.active.sock >= 0
1412 ? sx->ehlo_resp.crypted_auths : sx->ehlo_resp.cleartext_auths;
1414 uschar * fail_reason = US"server did not advertise AUTH support";
1416 f.smtp_authenticated = FALSE;
1417 client_authenticator = client_authenticated_id = client_authenticated_sender = NULL;
1420 regex_AUTH = regex_must_compile(AUTHS_REGEX, FALSE, TRUE);
1422 /* Is the server offering AUTH? */
1426 #ifdef SUPPORT_PIPE_CONNECT
1427 sx->early_pipe_active ? authbits
1430 regex_match_and_setup(regex_AUTH, sx->buffer, 0, -1)
1433 uschar * names = NULL;
1434 expand_nmax = -1; /* reset */
1436 #ifdef SUPPORT_PIPE_CONNECT
1437 if (!sx->early_pipe_active)
1439 names = string_copyn(expand_nstring[1], expand_nlength[1]);
1441 /* Must not do this check until after we have saved the result of the
1442 regex match above as the check could be another RE. */
1444 if ( require_auth == OK
1445 || verify_check_given_host(CUSS &ob->hosts_try_auth, host) == OK)
1447 DEBUG(D_transport) debug_printf("scanning authentication mechanisms\n");
1448 fail_reason = US"no common mechanisms were found";
1450 #ifdef SUPPORT_PIPE_CONNECT
1451 if (sx->early_pipe_active)
1453 /* Scan our authenticators (which support use by a client and were offered
1454 by the server (checked at cache-write time)), not suppressed by
1455 client_condition. If one is found, attempt to authenticate by calling its
1456 client function. We are limited to supporting up to 16 authenticator
1457 public-names by the number of bits in a short. */
1463 for (bitnum = 0, au = auths;
1464 !f.smtp_authenticated && au && bitnum < 16;
1465 bitnum++, au = au->next) if (authbits & BIT(bitnum))
1467 if ( au->client_condition
1468 && !expand_check_condition(au->client_condition, au->name,
1469 US"client authenticator"))
1471 DEBUG(D_transport) debug_printf("skipping %s authenticator: %s\n",
1472 au->name, "client_condition is false");
1476 /* Found data for a listed mechanism. Call its client entry. Set
1477 a flag in the outblock so that data is overwritten after sending so
1478 that reflections don't show it. */
1480 fail_reason = US"authentication attempt(s) failed";
1482 if ((rc = try_authenticator(sx, au)) != OK)
1489 /* Scan the configured authenticators looking for one which is configured
1490 for use as a client, which is not suppressed by client_condition, and
1491 whose name matches an authentication mechanism supported by the server.
1492 If one is found, attempt to authenticate by calling its client function.
1495 for (auth_instance * au = auths; !f.smtp_authenticated && au; au = au->next)
1500 || ( au->client_condition
1501 && !expand_check_condition(au->client_condition, au->name,
1502 US"client authenticator")))
1504 DEBUG(D_transport) debug_printf("skipping %s authenticator: %s\n",
1506 (au->client)? "client_condition is false" :
1507 "not configured as a client");
1511 /* Loop to scan supported server mechanisms */
1515 int len = Ustrlen(au->public_name);
1518 while (isspace(*p)) p++;
1520 if (strncmpic(au->public_name, p, len) != 0 ||
1521 (p[len] != 0 && !isspace(p[len])))
1523 while (*p != 0 && !isspace(*p)) p++;
1527 /* Found data for a listed mechanism. Call its client entry. Set
1528 a flag in the outblock so that data is overwritten after sending so
1529 that reflections don't show it. */
1531 fail_reason = US"authentication attempt(s) failed";
1533 if ((rc = try_authenticator(sx, au)) != OK)
1536 break; /* If not authenticated, try next authenticator */
1537 } /* Loop for scanning supported server mechanisms */
1538 } /* Loop for further authenticators */
1542 /* If we haven't authenticated, but are required to, give up. */
1544 if (require_auth == OK && !f.smtp_authenticated)
1546 set_errno_nohost(sx->addrlist, ERRNO_AUTHFAIL,
1547 string_sprintf("authentication required but %s", fail_reason), DEFER,
1556 /* Construct AUTH appendix string for MAIL TO */
1559 buffer to build string
1560 addrlist chain of potential addresses to deliver
1561 ob transport options
1563 Globals f.smtp_authenticated
1564 client_authenticated_sender
1565 Return True on error, otherwise buffer has (possibly empty) terminated string
1569 smtp_mail_auth_str(uschar *buffer, unsigned bufsize, address_item *addrlist,
1570 smtp_transport_options_block *ob)
1572 uschar * local_authenticated_sender = authenticated_sender;
1575 debug_printf("smtp_mail_auth_str: as<%s> os<%s> SA<%s>\n", authenticated_sender, ob->authenticated_sender, f.smtp_authenticated?"Y":"N");
1578 if (ob->authenticated_sender)
1580 uschar *new = expand_string(ob->authenticated_sender);
1583 if (!f.expand_string_forcedfail)
1585 uschar *message = string_sprintf("failed to expand "
1586 "authenticated_sender: %s", expand_string_message);
1587 set_errno_nohost(addrlist, ERRNO_EXPANDFAIL, message, DEFER, FALSE);
1591 else if (*new) local_authenticated_sender = new;
1594 /* Add the authenticated sender address if present */
1596 if ( (f.smtp_authenticated || ob->authenticated_sender_force)
1597 && local_authenticated_sender)
1599 string_format_nt(buffer, bufsize, " AUTH=%s",
1600 auth_xtextencode(local_authenticated_sender,
1601 Ustrlen(local_authenticated_sender)));
1602 client_authenticated_sender = string_copy(local_authenticated_sender);
1613 /* Lookup TLSA record for host/port.
1614 Return: OK success with dnssec; DANE mode
1615 DEFER Do not use this host now, may retry later
1616 FAIL_FORCED No TLSA record; DANE not usable
1617 FAIL Do not use this connection
1621 tlsa_lookup(const host_item * host, dns_answer * dnsa, BOOL dane_required)
1623 /* move this out to host.c given the similarity to dns_lookup() ? */
1625 const uschar * fullname = buffer;
1629 /* TLSA lookup string */
1630 (void)sprintf(CS buffer, "_%d._tcp.%.256s", host->port, host->name);
1632 rc = dns_lookup(dnsa, buffer, T_TLSA, &fullname);
1633 sec = dns_is_secure(dnsa);
1635 debug_printf("TLSA lookup ret %d %sDNSSEC\n", rc, sec ? "" : "not ");
1640 return DEFER; /* just defer this TLS'd conn */
1648 for (dns_record * rr = dns_next_rr(dnsa, &dnss, RESET_ANSWERS); rr;
1649 rr = dns_next_rr(dnsa, &dnss, RESET_NEXT))
1650 if (rr->type == T_TLSA && rr->size > 3)
1652 uint16_t payload_length = rr->size - 3;
1653 uschar s[MAX_TLSA_EXPANDED_SIZE], * sp = s, * p = US rr->data;
1655 sp += sprintf(CS sp, "%d ", *p++); /* usage */
1656 sp += sprintf(CS sp, "%d ", *p++); /* selector */
1657 sp += sprintf(CS sp, "%d ", *p++); /* matchtype */
1658 while (payload_length-- > 0 && sp-s < (MAX_TLSA_EXPANDED_SIZE - 4))
1659 sp += sprintf(CS sp, "%02x", *p++);
1661 debug_printf(" %s\n", s);
1666 log_write(0, LOG_MAIN,
1667 "DANE error: TLSA lookup for %s not DNSSEC", host->name);
1670 case DNS_NODATA: /* no TLSA RR for this lookup */
1671 case DNS_NOMATCH: /* no records at all for this lookup */
1672 return dane_required ? FAIL : FAIL_FORCED;
1676 return dane_required ? FAIL : DEFER;
1683 typedef struct smtp_compare_s
1685 uschar *current_sender_address;
1686 struct transport_instance *tblock;
1690 /* Create a unique string that identifies this message, it is based on
1691 sender_address, helo_data and tls_certificate if enabled.
1695 smtp_local_identity(uschar * sender, struct transport_instance * tblock)
1697 address_item * addr1;
1698 uschar * if1 = US"";
1699 uschar * helo1 = US"";
1701 uschar * tlsc1 = US"";
1703 uschar * save_sender_address = sender_address;
1704 uschar * local_identity = NULL;
1705 smtp_transport_options_block * ob = SOB tblock->options_block;
1707 sender_address = sender;
1709 addr1 = deliver_make_addr (sender, TRUE);
1710 deliver_set_expansions(addr1);
1713 if1 = expand_string(ob->interface);
1716 helo1 = expand_string(ob->helo_data);
1719 if (ob->tls_certificate)
1720 tlsc1 = expand_string(ob->tls_certificate);
1721 local_identity = string_sprintf ("%s^%s^%s", if1, helo1, tlsc1);
1723 local_identity = string_sprintf ("%s^%s", if1, helo1);
1726 deliver_set_expansions(NULL);
1727 sender_address = save_sender_address;
1729 return local_identity;
1734 /* This routine is a callback that is called from transport_check_waiting.
1735 This function will evaluate the incoming message versus the previous
1736 message. If the incoming message is using a different local identity then
1737 we will veto this new message. */
1740 smtp_are_same_identities(uschar * message_id, smtp_compare_t * s_compare)
1742 uschar * message_local_identity,
1743 * current_local_identity,
1744 * new_sender_address;
1746 current_local_identity =
1747 smtp_local_identity(s_compare->current_sender_address, s_compare->tblock);
1749 if (!(new_sender_address = deliver_get_sender_address(message_id)))
1752 message_local_identity =
1753 smtp_local_identity(new_sender_address, s_compare->tblock);
1755 return Ustrcmp(current_local_identity, message_local_identity) == 0;
1761 ehlo_response(uschar * buf, unsigned checks)
1763 size_t bsize = Ustrlen(buf);
1765 /* debug_printf("%s: check for 0x%04x\n", __FUNCTION__, checks); */
1768 if ( checks & OPTION_TLS
1769 && pcre_exec(regex_STARTTLS, NULL, CS buf, bsize, 0, PCRE_EOPT, NULL, 0) < 0)
1771 checks &= ~OPTION_TLS;
1773 if ( checks & OPTION_IGNQ
1774 && pcre_exec(regex_IGNOREQUOTA, NULL, CS buf, bsize, 0,
1775 PCRE_EOPT, NULL, 0) < 0)
1776 checks &= ~OPTION_IGNQ;
1778 if ( checks & OPTION_CHUNKING
1779 && pcre_exec(regex_CHUNKING, NULL, CS buf, bsize, 0, PCRE_EOPT, NULL, 0) < 0)
1780 checks &= ~OPTION_CHUNKING;
1782 #ifndef DISABLE_PRDR
1783 if ( checks & OPTION_PRDR
1784 && pcre_exec(regex_PRDR, NULL, CS buf, bsize, 0, PCRE_EOPT, NULL, 0) < 0)
1786 checks &= ~OPTION_PRDR;
1789 if ( checks & OPTION_UTF8
1790 && pcre_exec(regex_UTF8, NULL, CS buf, bsize, 0, PCRE_EOPT, NULL, 0) < 0)
1792 checks &= ~OPTION_UTF8;
1794 if ( checks & OPTION_DSN
1795 && pcre_exec(regex_DSN, NULL, CS buf, bsize, 0, PCRE_EOPT, NULL, 0) < 0)
1796 checks &= ~OPTION_DSN;
1798 if ( checks & OPTION_PIPE
1799 && pcre_exec(regex_PIPELINING, NULL, CS buf, bsize, 0,
1800 PCRE_EOPT, NULL, 0) < 0)
1801 checks &= ~OPTION_PIPE;
1803 if ( checks & OPTION_SIZE
1804 && pcre_exec(regex_SIZE, NULL, CS buf, bsize, 0, PCRE_EOPT, NULL, 0) < 0)
1805 checks &= ~OPTION_SIZE;
1807 #ifdef SUPPORT_PIPE_CONNECT
1808 if ( checks & OPTION_EARLY_PIPE
1809 && pcre_exec(regex_EARLY_PIPE, NULL, CS buf, bsize, 0,
1810 PCRE_EOPT, NULL, 0) < 0)
1812 checks &= ~OPTION_EARLY_PIPE;
1814 /* debug_printf("%s: found 0x%04x\n", __FUNCTION__, checks); */
1820 /* Callback for emitting a BDAT data chunk header.
1822 If given a nonzero size, first flush any buffered SMTP commands
1823 then emit the command.
1825 Reap previous SMTP command responses if requested, and always reap
1826 the response from a previous BDAT command.
1829 tctx transport context
1830 chunk_size value for SMTP BDAT command
1832 tc_chunk_last add LAST option to SMTP BDAT command
1833 tc_reap_prev reap response to previous SMTP commands
1837 DEFER TLS error on first read (EHLO-resp); errno set
1841 smtp_chunk_cmd_callback(transport_ctx * tctx, unsigned chunk_size,
1844 smtp_transport_options_block * ob = SOB tctx->tblock->options_block;
1845 smtp_context * sx = tctx->smtp_context;
1849 /* Write SMTP chunk header command. If not reaping responses, note that
1850 there may be more writes (like, the chunk data) done soon. */
1854 #ifdef SUPPORT_PIPE_CONNECT
1855 BOOL new_conn = !!(sx->outblock.conn_args);
1857 if((cmd_count = smtp_write_command(sx,
1858 flags & tc_reap_prev ? SCMD_FLUSH : SCMD_MORE,
1859 "BDAT %u%s\r\n", chunk_size, flags & tc_chunk_last ? " LAST" : "")
1860 ) < 0) return ERROR;
1861 if (flags & tc_chunk_last)
1862 data_command = string_copy(big_buffer); /* Save for later error message */
1863 #ifdef SUPPORT_PIPE_CONNECT
1864 /* That command write could have been the one that made the connection.
1865 Copy the fd from the client conn ctx (smtp transport specific) to the
1866 generic transport ctx. */
1869 tctx->u.fd = sx->outblock.cctx->sock;
1873 prev_cmd_count = cmd_count += sx->cmd_count;
1875 /* Reap responses for any previous, but not one we just emitted */
1879 if (sx->pending_BDAT)
1882 if (flags & tc_reap_prev && prev_cmd_count > 0)
1884 DEBUG(D_transport) debug_printf("look for %d responses"
1885 " for previous pipelined cmds\n", prev_cmd_count);
1887 switch(sync_responses(sx, prev_cmd_count, 0))
1889 case 1: /* 2xx (only) => OK */
1890 case 3: sx->good_RCPT = TRUE; /* 2xx & 5xx => OK & progress made */
1891 case 2: sx->completed_addr = TRUE; /* 5xx (only) => progress made */
1892 case 0: break; /* No 2xx or 5xx, but no probs */
1894 case -5: errno = ERRNO_TLSFAILURE;
1896 #ifdef SUPPORT_PIPE_CONNECT
1897 case -4: /* non-2xx for pipelined banner or EHLO */
1899 case -1: /* Timeout on RCPT */
1900 default: return ERROR; /* I/O error, or any MAIL/DATA error */
1903 if (!sx->pending_BDAT)
1904 pipelining_active = FALSE;
1907 /* Reap response for an outstanding BDAT */
1909 if (sx->pending_BDAT)
1911 DEBUG(D_transport) debug_printf("look for one response for BDAT\n");
1913 if (!smtp_read_response(sx, sx->buffer, sizeof(sx->buffer), '2',
1914 ob->command_timeout))
1916 if (errno == 0 && sx->buffer[0] == '4')
1918 errno = ERRNO_DATA4XX; /*XXX does this actually get used? */
1919 sx->addrlist->more_errno |=
1920 ((sx->buffer[1] - '0')*10 + sx->buffer[2] - '0') << 8;
1925 sx->pending_BDAT = FALSE;
1926 pipelining_active = FALSE;
1928 else if (chunk_size > 0)
1929 sx->pending_BDAT = TRUE;
1932 sx->cmd_count = cmd_count;
1940 /*************************************************
1941 * Make connection for given message *
1942 *************************************************/
1946 ctx connection context
1947 suppress_tls if TRUE, don't attempt a TLS connection - this is set for
1948 a second attempt after TLS initialization fails
1950 Returns: OK - the connection was made and the delivery attempted;
1951 fd is set in the conn context, tls_out set up.
1952 DEFER - the connection could not be made, or something failed
1953 while setting up the SMTP session, or there was a
1954 non-message-specific error, such as a timeout.
1955 ERROR - helo_data or add_headers or authenticated_sender is
1956 specified for this transport, and the string failed
1960 smtp_setup_conn(smtp_context * sx, BOOL suppress_tls)
1962 smtp_transport_options_block * ob = sx->conn_args.tblock->options_block;
1963 BOOL pass_message = FALSE;
1964 uschar * message = NULL;
1967 uschar * tls_errstr;
1970 sx->conn_args.ob = ob;
1972 sx->lmtp = strcmpic(ob->protocol, US"lmtp") == 0;
1973 sx->smtps = strcmpic(ob->protocol, US"smtps") == 0;
1975 sx->send_rset = TRUE;
1976 sx->send_quit = TRUE;
1977 sx->setting_up = TRUE;
1979 sx->esmtp_sent = FALSE;
1981 sx->utf8_needed = FALSE;
1983 sx->dsn_all_lasthop = TRUE;
1985 sx->conn_args.dane = FALSE;
1987 verify_check_given_host(CUSS &ob->hosts_require_dane, sx->conn_args.host) == OK;
1989 #ifdef SUPPORT_PIPE_CONNECT
1990 sx->early_pipe_active = sx->early_pipe_ok = FALSE;
1991 sx->ehlo_resp.cleartext_features = sx->ehlo_resp.crypted_features = 0;
1992 sx->pending_BANNER = sx->pending_EHLO = FALSE;
1995 if ((sx->max_rcpt = sx->conn_args.tblock->max_addresses) == 0) sx->max_rcpt = 999999;
1996 sx->peer_offered = 0;
1997 sx->avoid_option = 0;
1998 sx->igquotstr = US"";
1999 if (!sx->helo_data) sx->helo_data = ob->helo_data;
2000 #ifdef EXPERIMENTAL_DSN_INFO
2001 sx->smtp_greeting = NULL;
2002 sx->helo_response = NULL;
2005 smtp_command = US"initial connection";
2006 sx->buffer[0] = '\0';
2008 /* Set up the buffer for reading SMTP response packets. */
2010 sx->inblock.buffer = sx->inbuffer;
2011 sx->inblock.buffersize = sizeof(sx->inbuffer);
2012 sx->inblock.ptr = sx->inbuffer;
2013 sx->inblock.ptrend = sx->inbuffer;
2015 /* Set up the buffer for holding SMTP commands while pipelining */
2017 sx->outblock.buffer = sx->outbuffer;
2018 sx->outblock.buffersize = sizeof(sx->outbuffer);
2019 sx->outblock.ptr = sx->outbuffer;
2020 sx->outblock.cmd_count = 0;
2021 sx->outblock.authenticating = FALSE;
2022 sx->outblock.conn_args = NULL;
2024 /* Reset the parameters of a TLS session. */
2027 tls_out.cipher = NULL; /* the one we may use for this transport */
2028 tls_out.ourcert = NULL;
2029 tls_out.peercert = NULL;
2030 tls_out.peerdn = NULL;
2034 tls_out.ocsp = OCSP_NOT_REQ;
2035 #ifdef EXPERIMENTAL_TLS_RESUME
2036 tls_out.resumption = 0;
2039 /* Flip the legacy TLS-related variables over to the outbound set in case
2040 they're used in the context of the transport. Don't bother resetting
2041 afterward (when being used by a transport) as we're in a subprocess.
2042 For verify, unflipped once the callout is dealt with */
2044 tls_modify_variables(&tls_out);
2049 set_errno_nohost(sx->addrlist, ERRNO_TLSFAILURE, US"TLS support not available",
2055 /* Make a connection to the host if this isn't a continued delivery, and handle
2056 the initial interaction and HELO/EHLO/LHLO. Connect timeout errors are handled
2057 specially so they can be identified for retries. */
2059 if (!continue_hostname)
2062 HDEBUG(D_verify) debug_printf("interface=%s port=%d\n", sx->conn_args.interface, sx->port);
2064 /* Get the actual port the connection will use, into sx->conn_args.host */
2066 smtp_port_for_connect(sx->conn_args.host, sx->port);
2069 /* Do TLSA lookup for DANE */
2071 tls_out.dane_verified = FALSE;
2072 tls_out.tlsa_usage = 0;
2074 if (sx->conn_args.host->dnssec == DS_YES)
2077 if( sx->dane_required
2078 || verify_check_given_host(CUSS &ob->hosts_try_dane, sx->conn_args.host) == OK
2080 switch (rc = tlsa_lookup(sx->conn_args.host, &sx->conn_args.tlsa_dnsa, sx->dane_required))
2082 case OK: sx->conn_args.dane = TRUE;
2083 ob->tls_tempfail_tryclear = FALSE;
2085 case FAIL_FORCED: break;
2086 default: set_errno_nohost(sx->addrlist, ERRNO_DNSDEFER,
2087 string_sprintf("DANE error: tlsa lookup %s",
2090 # ifndef DISABLE_EVENT
2091 (void) event_raise(sx->conn_args.tblock->event_action,
2092 US"dane:fail", sx->dane_required
2093 ? US"dane-required" : US"dnssec-invalid");
2098 else if (sx->dane_required)
2100 set_errno_nohost(sx->addrlist, ERRNO_DNSDEFER,
2101 string_sprintf("DANE error: %s lookup not DNSSEC", sx->conn_args.host->name),
2103 # ifndef DISABLE_EVENT
2104 (void) event_raise(sx->conn_args.tblock->event_action,
2105 US"dane:fail", US"dane-required");
2112 /* Make the TCP connection */
2114 sx->cctx.tls_ctx = NULL;
2115 sx->inblock.cctx = sx->outblock.cctx = &sx->cctx;
2116 sx->avoid_option = sx->peer_offered = smtp_peer_options = 0;
2118 #ifdef SUPPORT_PIPE_CONNECT
2119 if ( verify_check_given_host(CUSS &ob->hosts_pipe_connect,
2120 sx->conn_args.host) == OK)
2122 /* We don't find out the local ip address until the connect, so if
2123 the helo string might use it avoid doing early-pipelining. */
2126 || !Ustrstr(sx->helo_data, "$sending_ip_address")
2127 || Ustrstr(sx->helo_data, "def:sending_ip_address")
2130 sx->early_pipe_ok = TRUE;
2131 if ( read_ehlo_cache_entry(sx)
2132 && sx->ehlo_resp.cleartext_features & OPTION_EARLY_PIPE)
2135 debug_printf("Using cached cleartext PIPE_CONNECT\n");
2136 sx->early_pipe_active = TRUE;
2137 sx->peer_offered = sx->ehlo_resp.cleartext_features;
2140 else DEBUG(D_transport)
2141 debug_printf("helo needs $sending_ip_address\n");
2143 if (sx->early_pipe_active)
2144 sx->outblock.conn_args = &sx->conn_args;
2148 if ((sx->cctx.sock = smtp_connect(&sx->conn_args, NULL)) < 0)
2150 set_errno_nohost(sx->addrlist,
2151 errno == ETIMEDOUT ? ERRNO_CONNECTTIMEOUT : errno,
2152 sx->verify ? US strerror(errno) : NULL,
2154 sx->send_quit = FALSE;
2158 /* Expand the greeting message while waiting for the initial response. (Makes
2159 sense if helo_data contains ${lookup dnsdb ...} stuff). The expansion is
2160 delayed till here so that $sending_interface and $sending_port are set. */
2161 /*XXX early-pipe: they still will not be. Is there any way to find out what they
2162 will be? Somehow I doubt it. */
2165 if (!(sx->helo_data = expand_string(sx->helo_data)))
2167 log_write(0, LOG_MAIN|LOG_PANIC,
2168 "<%s>: failed to expand transport's helo_data value for callout: %s",
2169 sx->addrlist->address, expand_string_message);
2174 expand_string_message = NULL;
2175 if ((sx->helo_data = string_domain_utf8_to_alabel(sx->helo_data,
2176 &expand_string_message)),
2177 expand_string_message)
2179 log_write(0, LOG_MAIN|LOG_PANIC,
2180 "<%s>: failed to expand transport's helo_data value for callout: %s",
2181 sx->addrlist->address, expand_string_message);
2183 sx->helo_data = NULL;
2187 /* The first thing is to wait for an initial OK response. The dreaded "goto"
2188 is nevertheless a reasonably clean way of programming this kind of logic,
2189 where you want to escape on any error. */
2193 #ifdef SUPPORT_PIPE_CONNECT
2194 if (sx->early_pipe_active)
2196 sx->pending_BANNER = TRUE; /* sync_responses() must eventually handle */
2197 sx->outblock.cmd_count = 1;
2203 (void) setsockopt(sx->cctx.sock, IPPROTO_TCP, TCP_QUICKACK, US &off,
2206 if (!smtp_reap_banner(sx))
2207 goto RESPONSE_FAILED;
2210 #ifndef DISABLE_EVENT
2213 lookup_dnssec_authenticated = sx->conn_args.host->dnssec==DS_YES ? US"yes"
2214 : sx->conn_args.host->dnssec==DS_NO ? US"no" : NULL;
2215 s = event_raise(sx->conn_args.tblock->event_action, US"smtp:connect", sx->buffer);
2218 set_errno_nohost(sx->addrlist, ERRNO_EXPANDFAIL,
2219 string_sprintf("deferred by smtp:connect event expansion: %s", s),
2227 /* Now check if the helo_data expansion went well, and sign off cleanly if
2232 message = string_sprintf("failed to expand helo_data: %s",
2233 expand_string_message);
2234 set_errno_nohost(sx->addrlist, ERRNO_EXPANDFAIL, message, DEFER, FALSE);
2240 /** Debugging without sending a message
2241 sx->addrlist->transport_return = DEFER;
2245 /* Errors that occur after this point follow an SMTP command, which is
2246 left in big_buffer by smtp_write_command() for use in error messages. */
2248 smtp_command = big_buffer;
2250 /* Tell the remote who we are...
2252 February 1998: A convention has evolved that ESMTP-speaking MTAs include the
2253 string "ESMTP" in their greeting lines, so make Exim send EHLO if the
2254 greeting is of this form. The assumption was that the far end supports it
2255 properly... but experience shows that there are some that give 5xx responses,
2256 even though the banner includes "ESMTP" (there's a bloody-minded one that
2257 says "ESMTP not spoken here"). Cope with that case.
2259 September 2000: Time has passed, and it seems reasonable now to always send
2260 EHLO at the start. It is also convenient to make the change while installing
2263 July 2003: Joachim Wieland met a broken server that advertises "PIPELINING"
2264 but times out after sending MAIL FROM, RCPT TO and DATA all together. There
2265 would be no way to send out the mails, so there is now a host list
2266 "hosts_avoid_esmtp" that disables ESMTP for special hosts and solves the
2267 PIPELINING problem as well. Maybe it can also be useful to cure other
2268 problems with broken servers.
2270 Exim originally sent "Helo" at this point and ran for nearly a year that way.
2271 Then somebody tried it with a Microsoft mailer... It seems that all other
2272 mailers use upper case for some reason (the RFC is quite clear about case
2273 independence) so, for peace of mind, I gave in. */
2275 sx->esmtp = verify_check_given_host(CUSS &ob->hosts_avoid_esmtp, sx->conn_args.host) != OK;
2277 /* Alas; be careful, since this goto is not an error-out, so conceivably
2278 we might set data between here and the target which we assume to exist
2279 and be usable. I can see this coming back to bite us. */
2283 smtp_peer_options |= OPTION_TLS;
2284 suppress_tls = FALSE;
2285 ob->tls_tempfail_tryclear = FALSE;
2286 smtp_command = US"SSL-on-connect";
2293 if (smtp_write_command(sx,
2294 #ifdef SUPPORT_PIPE_CONNECT
2295 sx->early_pipe_active ? SCMD_BUFFER :
2298 "%s %s\r\n", sx->lmtp ? "LHLO" : "EHLO", sx->helo_data) < 0)
2300 sx->esmtp_sent = TRUE;
2302 #ifdef SUPPORT_PIPE_CONNECT
2303 if (sx->early_pipe_active)
2305 sx->pending_EHLO = TRUE;
2307 /* If we have too many authenticators to handle and might need to AUTH
2308 for this transport, pipeline no further as we will need the
2309 list of auth methods offered. Reap the banner and EHLO. */
2311 if ( (ob->hosts_require_auth || ob->hosts_try_auth)
2312 && f.smtp_in_early_pipe_no_auth)
2314 DEBUG(D_transport) debug_printf("may need to auth, so pipeline no further\n");
2315 if (smtp_write_command(sx, SCMD_FLUSH, NULL) < 0)
2317 if (sync_responses(sx, 2, 0) != 0)
2320 debug_printf("failed reaping pipelined cmd responses\n");
2321 goto RESPONSE_FAILED;
2323 sx->early_pipe_active = FALSE;
2328 if (!smtp_reap_ehlo(sx))
2329 goto RESPONSE_FAILED;
2333 debug_printf("not sending EHLO (host matches hosts_avoid_esmtp)\n");
2335 #ifdef SUPPORT_PIPE_CONNECT
2336 if (!sx->early_pipe_active)
2341 int n = sizeof(sx->buffer);
2342 uschar * rsp = sx->buffer;
2344 if (sx->esmtp_sent && (n = Ustrlen(sx->buffer)) < sizeof(sx->buffer)/2)
2345 { rsp = sx->buffer + n + 1; n = sizeof(sx->buffer) - n; }
2347 if (smtp_write_command(sx, SCMD_FLUSH, "HELO %s\r\n", sx->helo_data) < 0)
2349 good_response = smtp_read_response(sx, rsp, n, '2', ob->command_timeout);
2350 #ifdef EXPERIMENTAL_DSN_INFO
2351 sx->helo_response = string_copy(rsp);
2355 /* Handle special logging for a closed connection after HELO
2356 when had previously sent EHLO */
2358 if (rsp != sx->buffer && rsp[0] == 0 && (errno == 0 || errno == ECONNRESET))
2360 errno = ERRNO_SMTPCLOSED;
2361 goto EHLOHELO_FAILED;
2363 memmove(sx->buffer, rsp, Ustrlen(rsp));
2364 goto RESPONSE_FAILED;
2368 if (sx->esmtp || sx->lmtp)
2370 #ifdef SUPPORT_PIPE_CONNECT
2371 if (!sx->early_pipe_active)
2374 sx->peer_offered = ehlo_response(sx->buffer,
2375 OPTION_TLS /* others checked later */
2376 #ifdef SUPPORT_PIPE_CONNECT
2377 | (sx->early_pipe_ok
2379 | OPTION_CHUNKING | OPTION_PRDR | OPTION_DSN | OPTION_PIPE | OPTION_SIZE
2388 #ifdef SUPPORT_PIPE_CONNECT
2389 if (sx->early_pipe_ok)
2391 sx->ehlo_resp.cleartext_features = sx->peer_offered;
2393 if ( (sx->peer_offered & (OPTION_PIPE | OPTION_EARLY_PIPE))
2394 == (OPTION_PIPE | OPTION_EARLY_PIPE))
2396 DEBUG(D_transport) debug_printf("PIPE_CONNECT usable in future for this IP\n");
2397 sx->ehlo_resp.cleartext_auths = study_ehlo_auths(sx);
2398 write_ehlo_cache_entry(sx);
2404 /* Set tls_offered if the response to EHLO specifies support for STARTTLS. */
2407 smtp_peer_options |= sx->peer_offered & OPTION_TLS;
2412 /* For continuing deliveries down the same channel, having re-exec'd the socket
2413 is the standard input; for a socket held open from verify it is recorded
2414 in the cutthrough context block. Either way we don't need to redo EHLO here
2415 (but may need to do so for TLS - see below).
2416 Set up the pointer to where subsequent commands will be left, for
2417 error messages. Note that smtp_peer_options will have been
2418 set from the command line if they were set in the process that passed the
2421 /*XXX continue case needs to propagate DSN_INFO, prob. in deliver.c
2422 as the continue goes via transport_pass_socket() and doublefork and exec.
2423 It does not wait. Unclear how we keep separate host's responses
2424 separate - we could match up by host ip+port as a bodge. */
2428 if (cutthrough.cctx.sock >= 0 && cutthrough.callout_hold_only)
2430 sx->cctx = cutthrough.cctx;
2431 sx->conn_args.host->port = sx->port = cutthrough.host.port;
2435 sx->cctx.sock = 0; /* stdin */
2436 sx->cctx.tls_ctx = NULL;
2437 smtp_port_for_connect(sx->conn_args.host, sx->port); /* Record the port that was used */
2439 sx->inblock.cctx = sx->outblock.cctx = &sx->cctx;
2440 smtp_command = big_buffer;
2441 sx->helo_data = NULL; /* ensure we re-expand ob->helo_data */
2443 /* For a continued connection with TLS being proxied for us, or a
2444 held-open verify connection with TLS, nothing more to do. */
2446 if ( continue_proxy_cipher
2447 || (cutthrough.cctx.sock >= 0 && cutthrough.callout_hold_only
2448 && cutthrough.is_tls)
2451 sx->peer_offered = smtp_peer_options;
2452 sx->pipelining_used = pipelining_active = !!(smtp_peer_options & OPTION_PIPE);
2453 HDEBUG(D_transport) debug_printf("continued connection, %s TLS\n",
2454 continue_proxy_cipher ? "proxied" : "verify conn with");
2457 HDEBUG(D_transport) debug_printf("continued connection, no TLS\n");
2460 /* If TLS is available on this connection, whether continued or not, attempt to
2461 start up a TLS session, unless the host is in hosts_avoid_tls. If successful,
2462 send another EHLO - the server may give a different answer in secure mode. We
2463 use a separate buffer for reading the response to STARTTLS so that if it is
2464 negative, the original EHLO data is available for subsequent analysis, should
2465 the client not be required to use TLS. If the response is bad, copy the buffer
2466 for error analysis. */
2469 if ( smtp_peer_options & OPTION_TLS
2471 && verify_check_given_host(CUSS &ob->hosts_avoid_tls, sx->conn_args.host) != OK
2473 || verify_check_given_host(CUSS &ob->hosts_verify_avoid_tls, sx->conn_args.host) != OK
2476 uschar buffer2[4096];
2478 if (smtp_write_command(sx, SCMD_FLUSH, "STARTTLS\r\n") < 0)
2481 #ifdef SUPPORT_PIPE_CONNECT
2482 /* If doing early-pipelining reap the banner and EHLO-response but leave
2483 the response for the STARTTLS we just sent alone. */
2485 if (sx->early_pipe_active && sync_responses(sx, 2, 0) != 0)
2488 debug_printf("failed reaping pipelined cmd responses\n");
2489 goto RESPONSE_FAILED;
2493 /* If there is an I/O error, transmission of this message is deferred. If
2494 there is a temporary rejection of STARRTLS and tls_tempfail_tryclear is
2495 false, we also defer. However, if there is a temporary rejection of STARTTLS
2496 and tls_tempfail_tryclear is true, or if there is an outright rejection of
2497 STARTTLS, we carry on. This means we will try to send the message in clear,
2498 unless the host is in hosts_require_tls (tested below). */
2500 if (!smtp_read_response(sx, buffer2, sizeof(buffer2), '2', ob->command_timeout))
2504 || (buffer2[0] == '4' && !ob->tls_tempfail_tryclear)
2507 Ustrncpy(sx->buffer, buffer2, sizeof(sx->buffer));
2508 sx->buffer[sizeof(sx->buffer)-1] = '\0';
2509 goto RESPONSE_FAILED;
2513 /* STARTTLS accepted: try to negotiate a TLS session. */
2518 if (!tls_client_start(&sx->cctx, &sx->conn_args, sx->addrlist, &tls_out, &tls_errstr))
2520 /* TLS negotiation failed; give an error. From outside, this function may
2521 be called again to try in clear on a new connection, if the options permit
2522 it for this host. */
2526 DEBUG(D_tls) debug_printf("TLS session fail: %s\n", tls_errstr);
2528 # ifdef SUPPORT_DANE
2529 if (sx->conn_args.dane)
2531 log_write(0, LOG_MAIN,
2532 "DANE attempt failed; TLS connection to %s [%s]: %s",
2533 sx->conn_args.host->name, sx->conn_args.host->address, tls_errstr);
2534 # ifndef DISABLE_EVENT
2535 (void) event_raise(sx->conn_args.tblock->event_action,
2536 US"dane:fail", US"validation-failure"); /* could do with better detail */
2541 errno = ERRNO_TLSFAILURE;
2542 message = string_sprintf("TLS session: %s", tls_errstr);
2543 sx->send_quit = FALSE;
2547 /* TLS session is set up */
2549 smtp_peer_options_wrap = smtp_peer_options;
2550 for (address_item * addr = sx->addrlist; addr; addr = addr->next)
2551 if (addr->transport_return == PENDING_DEFER)
2553 addr->cipher = tls_out.cipher;
2554 addr->ourcert = tls_out.ourcert;
2555 addr->peercert = tls_out.peercert;
2556 addr->peerdn = tls_out.peerdn;
2557 addr->ocsp = tls_out.ocsp;
2562 /* if smtps, we'll have smtp_command set to something else; always safe to
2564 smtp_command = big_buffer;
2566 /* If we started TLS, redo the EHLO/LHLO exchange over the secure channel. If
2567 helo_data is null, we are dealing with a connection that was passed from
2568 another process, and so we won't have expanded helo_data above. We have to
2569 expand it here. $sending_ip_address and $sending_port are set up right at the
2570 start of the Exim process (in exim.c). */
2572 if (tls_out.active.sock >= 0)
2574 uschar * greeting_cmd;
2576 if (!sx->helo_data && !(sx->helo_data = expand_string(ob->helo_data)))
2578 uschar *message = string_sprintf("failed to expand helo_data: %s",
2579 expand_string_message);
2580 set_errno_nohost(sx->addrlist, ERRNO_EXPANDFAIL, message, DEFER, FALSE);
2585 #ifdef SUPPORT_PIPE_CONNECT
2586 /* For SMTPS there is no cleartext early-pipe; use the crypted permission bit.
2587 We're unlikely to get the group sent and delivered before the server sends its
2588 banner, but it's still worth sending as a group.
2589 For STARTTLS allow for cleartext early-pipe but no crypted early-pipe, but not
2592 if (sx->smtps ? sx->early_pipe_ok : sx->early_pipe_active)
2594 sx->peer_offered = sx->ehlo_resp.crypted_features;
2595 if ((sx->early_pipe_active =
2596 !!(sx->ehlo_resp.crypted_features & OPTION_EARLY_PIPE)))
2597 DEBUG(D_transport) debug_printf("Using cached crypted PIPE_CONNECT\n");
2601 /* For SMTPS we need to wait for the initial OK response. */
2603 #ifdef SUPPORT_PIPE_CONNECT
2604 if (sx->early_pipe_active)
2606 sx->pending_BANNER = TRUE;
2607 sx->outblock.cmd_count = 1;
2611 if (!smtp_reap_banner(sx))
2612 goto RESPONSE_FAILED;
2615 greeting_cmd = US"LHLO";
2617 greeting_cmd = US"EHLO";
2620 greeting_cmd = US"HELO";
2622 debug_printf("not sending EHLO (host matches hosts_avoid_esmtp)\n");
2625 if (smtp_write_command(sx,
2626 #ifdef SUPPORT_PIPE_CONNECT
2627 sx->early_pipe_active ? SCMD_BUFFER :
2630 "%s %s\r\n", greeting_cmd, sx->helo_data) < 0)
2633 #ifdef SUPPORT_PIPE_CONNECT
2634 if (sx->early_pipe_active)
2635 sx->pending_EHLO = TRUE;
2639 if (!smtp_reap_ehlo(sx))
2642 /* The GnuTLS layer in Exim only spots a server-rejection of a client
2643 cert late, under TLS1.3 - which means here; the first time we try to
2644 receive crypted data. Treat it as if it was a connect-time failure.
2645 See also the early-pipe equivalent... which will be hard; every call
2646 to sync_responses will need to check the result.
2647 It would be nicer to have GnuTLS check the cert during the handshake.
2648 Can it do that, with all the flexibility we need? */
2650 tls_errstr = US"error on first read";
2651 goto GNUTLS_CONN_FAILED;
2654 goto RESPONSE_FAILED;
2656 smtp_peer_options = 0;
2660 /* If the host is required to use a secure channel, ensure that we
2664 # ifdef SUPPORT_DANE
2665 || sx->conn_args.dane
2667 || verify_check_given_host(CUSS &ob->hosts_require_tls, sx->conn_args.host) == OK
2670 errno = ERRNO_TLSREQUIRED;
2671 message = string_sprintf("a TLS session is required, but %s",
2672 smtp_peer_options & OPTION_TLS
2673 ? "an attempt to start TLS failed" : "the server did not offer TLS support");
2674 # if defined(SUPPORT_DANE) && !defined(DISABLE_EVENT)
2675 if (sx->conn_args.dane)
2676 (void) event_raise(sx->conn_args.tblock->event_action, US"dane:fail",
2677 smtp_peer_options & OPTION_TLS
2678 ? US"validation-failure" /* could do with better detail */
2679 : US"starttls-not-supported");
2683 #endif /*DISABLE_TLS*/
2685 /* If TLS is active, we have just started it up and re-done the EHLO command,
2686 so its response needs to be analyzed. If TLS is not active and this is a
2687 continued session down a previously-used socket, we haven't just done EHLO, so
2690 if (continue_hostname == NULL
2692 || tls_out.active.sock >= 0
2696 if (sx->esmtp || sx->lmtp)
2698 #ifdef SUPPORT_PIPE_CONNECT
2699 if (!sx->early_pipe_active)
2702 sx->peer_offered = ehlo_response(sx->buffer,
2704 #ifdef SUPPORT_PIPE_CONNECT
2705 | (sx->lmtp && ob->lmtp_ignore_quota ? OPTION_IGNQ : 0)
2706 | OPTION_DSN | OPTION_PIPE | OPTION_SIZE
2707 | OPTION_CHUNKING | OPTION_PRDR | OPTION_UTF8
2708 | (tls_out.active.sock >= 0 ? OPTION_EARLY_PIPE : 0) /* not for lmtp */
2712 | (sx->lmtp && ob->lmtp_ignore_quota ? OPTION_IGNQ : 0)
2715 # ifdef SUPPORT_I18N
2716 | (sx->addrlist->prop.utf8_msg ? OPTION_UTF8 : 0)
2717 /*XXX if we hand peercaps on to continued-conn processes,
2718 must not depend on this addr */
2722 | (ob->size_addition >= 0 ? OPTION_SIZE : 0)
2725 #ifdef SUPPORT_PIPE_CONNECT
2726 if (tls_out.active.sock >= 0)
2727 sx->ehlo_resp.crypted_features = sx->peer_offered;
2731 /* Set for IGNOREQUOTA if the response to LHLO specifies support and the
2732 lmtp_ignore_quota option was set. */
2734 sx->igquotstr = sx->peer_offered & OPTION_IGNQ ? US" IGNOREQUOTA" : US"";
2736 /* If the response to EHLO specified support for the SIZE parameter, note
2737 this, provided size_addition is non-negative. */
2739 smtp_peer_options |= sx->peer_offered & OPTION_SIZE;
2741 /* Note whether the server supports PIPELINING. If hosts_avoid_esmtp matched
2742 the current host, esmtp will be false, so PIPELINING can never be used. If
2743 the current host matches hosts_avoid_pipelining, don't do it. */
2745 if ( sx->peer_offered & OPTION_PIPE
2746 && verify_check_given_host(CUSS &ob->hosts_avoid_pipelining, sx->conn_args.host) != OK)
2747 smtp_peer_options |= OPTION_PIPE;
2749 DEBUG(D_transport) debug_printf("%susing PIPELINING\n",
2750 smtp_peer_options & OPTION_PIPE ? "" : "not ");
2752 if ( sx->peer_offered & OPTION_CHUNKING
2753 && verify_check_given_host(CUSS &ob->hosts_try_chunking, sx->conn_args.host) != OK)
2754 sx->peer_offered &= ~OPTION_CHUNKING;
2756 if (sx->peer_offered & OPTION_CHUNKING)
2757 DEBUG(D_transport) debug_printf("CHUNKING usable\n");
2759 #ifndef DISABLE_PRDR
2760 if ( sx->peer_offered & OPTION_PRDR
2761 && verify_check_given_host(CUSS &ob->hosts_try_prdr, sx->conn_args.host) != OK)
2762 sx->peer_offered &= ~OPTION_PRDR;
2764 if (sx->peer_offered & OPTION_PRDR)
2765 DEBUG(D_transport) debug_printf("PRDR usable\n");
2768 /* Note if the server supports DSN */
2769 smtp_peer_options |= sx->peer_offered & OPTION_DSN;
2770 DEBUG(D_transport) debug_printf("%susing DSN\n",
2771 sx->peer_offered & OPTION_DSN ? "" : "not ");
2773 #ifdef SUPPORT_PIPE_CONNECT
2774 if ( sx->early_pipe_ok
2775 && !sx->early_pipe_active
2776 && tls_out.active.sock >= 0
2777 && smtp_peer_options & OPTION_PIPE
2778 && ( sx->ehlo_resp.cleartext_features | sx->ehlo_resp.crypted_features)
2779 & OPTION_EARLY_PIPE)
2781 DEBUG(D_transport) debug_printf("PIPE_CONNECT usable in future for this IP\n");
2782 sx->ehlo_resp.crypted_auths = study_ehlo_auths(sx);
2783 write_ehlo_cache_entry(sx);
2787 /* Note if the response to EHLO specifies support for the AUTH extension.
2788 If it has, check that this host is one we want to authenticate to, and do
2789 the business. The host name and address must be available when the
2790 authenticator's client driver is running. */
2792 switch (yield = smtp_auth(sx))
2794 default: goto SEND_QUIT;
2796 case FAIL_SEND: goto SEND_FAILED;
2797 case FAIL: goto RESPONSE_FAILED;
2801 sx->pipelining_used = pipelining_active = !!(smtp_peer_options & OPTION_PIPE);
2803 /* The setting up of the SMTP call is now complete. Any subsequent errors are
2804 message-specific. */
2806 sx->setting_up = FALSE;
2809 if (sx->addrlist->prop.utf8_msg)
2813 /* If the transport sets a downconversion mode it overrides any set by ACL
2816 if ((s = ob->utf8_downconvert))
2818 if (!(s = expand_string(s)))
2820 message = string_sprintf("failed to expand utf8_downconvert: %s",
2821 expand_string_message);
2822 set_errno_nohost(sx->addrlist, ERRNO_EXPANDFAIL, message, DEFER, FALSE);
2828 case '1': sx->addrlist->prop.utf8_downcvt = TRUE;
2829 sx->addrlist->prop.utf8_downcvt_maybe = FALSE;
2831 case '0': sx->addrlist->prop.utf8_downcvt = FALSE;
2832 sx->addrlist->prop.utf8_downcvt_maybe = FALSE;
2834 case '-': if (s[1] == '1')
2836 sx->addrlist->prop.utf8_downcvt = FALSE;
2837 sx->addrlist->prop.utf8_downcvt_maybe = TRUE;
2843 sx->utf8_needed = !sx->addrlist->prop.utf8_downcvt
2844 && !sx->addrlist->prop.utf8_downcvt_maybe;
2845 DEBUG(D_transport) if (!sx->utf8_needed)
2846 debug_printf("utf8: %s downconvert\n",
2847 sx->addrlist->prop.utf8_downcvt ? "mandatory" : "optional");
2850 /* If this is an international message we need the host to speak SMTPUTF8 */
2851 if (sx->utf8_needed && !(sx->peer_offered & OPTION_UTF8))
2853 errno = ERRNO_UTF8_FWD;
2854 goto RESPONSE_FAILED;
2856 #endif /*SUPPORT_I18N*/
2865 if (errno == ECONNREFUSED) /* first-read error on a TFO conn */
2867 /* There is a testing facility for simulating a connection timeout, as I
2868 can't think of any other way of doing this. It converts a connection
2869 refused into a timeout if the timeout is set to 999999. This is done for
2870 a 3whs connection in ip_connect(), but a TFO connection does not error
2871 there - instead it gets ECONNREFUSED on the first data read. Tracking
2872 that a TFO really was done is too hard, or we would set a
2873 sx->pending_conn_done bit and test that in smtp_reap_banner() and
2874 smtp_reap_ehlo(). That would let us also add the conn-timeout to the
2877 if (f.running_in_test_harness && ob->connect_timeout == 999999)
2879 set_errno_nohost(sx->addrlist,
2880 errno == ETIMEDOUT ? ERRNO_CONNECTTIMEOUT : errno,
2881 sx->verify ? US strerror(errno) : NULL,
2883 sx->send_quit = FALSE;
2887 /* really an error on an SMTP read */
2889 sx->send_quit = check_response(sx->conn_args.host, &errno, sx->addrlist->more_errno,
2890 sx->buffer, &code, &message, &pass_message);
2896 message = US string_sprintf("send() to %s [%s] failed: %s",
2897 sx->conn_args.host->name, sx->conn_args.host->address, strerror(errno));
2898 sx->send_quit = FALSE;
2904 message = string_sprintf("Remote host closed connection in response to %s"
2905 " (EHLO response was: %s)", smtp_command, sx->buffer);
2906 sx->send_quit = FALSE;
2910 /* This label is jumped to directly when a TLS negotiation has failed,
2911 or was not done for a host for which it is required. Values will be set
2912 in message and errno, and setting_up will always be true. Treat as
2913 a temporary error. */
2917 code = '4', yield = DEFER;
2921 /* The failure happened while setting up the call; see if the failure was
2922 a 5xx response (this will either be on connection, or following HELO - a 5xx
2923 after EHLO causes it to try HELO). If so, and there are no more hosts to try,
2924 fail all addresses, as this host is never going to accept them. For other
2925 errors during setting up (timeouts or whatever), defer all addresses, and
2926 yield DEFER, so that the host is not tried again for a while.
2928 XXX This peeking for another host feels like a layering violation. We want
2929 to note the host as unusable, but down here we shouldn't know if this was
2930 the last host to try for the addr(list). Perhaps the upper layer should be
2931 the one to do set_errno() ? The problem is that currently the addr is where
2932 errno etc. are stashed, but until we run out of hosts to try the errors are
2933 host-specific. Maybe we should enhance the host_item definition? */
2936 sx->ok = FALSE; /* For when reached by GOTO */
2937 set_errno(sx->addrlist, errno, message,
2938 sx->conn_args.host->next
2942 || errno == ERRNO_UTF8_FWD
2946 errno == ECONNREFUSED ? NULL : sx->conn_args.host
2947 #ifdef EXPERIMENTAL_DSN_INFO
2948 , sx->smtp_greeting, sx->helo_response
2957 (void)smtp_write_command(sx, SCMD_FLUSH, "QUIT\r\n");
2960 if (sx->cctx.tls_ctx)
2962 tls_close(sx->cctx.tls_ctx, TLS_SHUTDOWN_NOWAIT);
2963 sx->cctx.tls_ctx = NULL;
2967 /* Close the socket, and return the appropriate value, first setting
2968 works because the NULL setting is passed back to the calling process, and
2969 remote_max_parallel is forced to 1 when delivering over an existing connection,
2972 HDEBUG(D_transport|D_acl|D_v) debug_printf_indent(" SMTP(close)>>\n");
2975 shutdown(sx->cctx.sock, SHUT_WR);
2976 if (fcntl(sx->cctx.sock, F_SETFL, O_NONBLOCK) == 0)
2977 for (int i = 16; read(sx->cctx.sock, sx->inbuffer, sizeof(sx->inbuffer)) > 0 && i > 0;)
2978 i--; /* drain socket */
2979 sx->send_quit = FALSE;
2981 (void)close(sx->cctx.sock);
2984 #ifndef DISABLE_EVENT
2985 (void) event_raise(sx->conn_args.tblock->event_action, US"tcp:close", NULL);
2988 continue_transport = NULL;
2989 continue_hostname = NULL;
2996 /* Create the string of options that will be appended to the MAIL FROM:
2997 in the connection context buffer */
3000 build_mailcmd_options(smtp_context * sx, address_item * addrlist)
3002 uschar * p = sx->buffer;
3003 address_item * addr;
3008 /* If we know the receiving MTA supports the SIZE qualification, and we know it,
3009 send it, adding something to the message size to allow for imprecision
3010 and things that get added en route. Exim keeps the number of lines
3011 in a message, so we can give an accurate value for the original message, but we
3012 need some additional to handle added headers. (Double "." characters don't get
3013 included in the count.) */
3015 if ( message_size > 0
3016 && sx->peer_offered & OPTION_SIZE && !(sx->avoid_option & OPTION_SIZE))
3018 /*XXX problem here under spool_files_wireformat?
3019 Or just forget about lines? Or inflate by a fixed proportion? */
3021 sprintf(CS p, " SIZE=%d", message_size+message_linecount+(SOB sx->conn_args.ob)->size_addition);
3025 #ifndef DISABLE_PRDR
3026 /* If it supports Per-Recipient Data Responses, and we have more than one recipient,
3029 sx->prdr_active = FALSE;
3030 if (sx->peer_offered & OPTION_PRDR)
3031 for (address_item * addr = addrlist; addr; addr = addr->next)
3032 if (addr->transport_return == PENDING_DEFER)
3034 for (addr = addr->next; addr; addr = addr->next)
3035 if (addr->transport_return == PENDING_DEFER)
3036 { /* at least two recipients to send */
3037 sx->prdr_active = TRUE;
3038 sprintf(CS p, " PRDR"); p += 5;
3046 /* If it supports internationalised messages, and this meesage need that,
3049 if ( sx->peer_offered & OPTION_UTF8
3050 && addrlist->prop.utf8_msg
3051 && !addrlist->prop.utf8_downcvt
3053 Ustrcpy(p, US" SMTPUTF8"), p += 9;
3056 /* check if all addresses have DSN-lasthop flag; do not send RET and ENVID if so */
3057 for (sx->dsn_all_lasthop = TRUE, addr = addrlist, address_count = 0;
3058 addr && address_count < sx->max_rcpt;
3059 addr = addr->next) if (addr->transport_return == PENDING_DEFER)
3062 if (!(addr->dsn_flags & rf_dsnlasthop))
3064 sx->dsn_all_lasthop = FALSE;
3069 /* Add any DSN flags to the mail command */
3071 if (sx->peer_offered & OPTION_DSN && !sx->dsn_all_lasthop)
3073 if (dsn_ret == dsn_ret_hdrs)
3074 { Ustrcpy(p, US" RET=HDRS"); p += 9; }
3075 else if (dsn_ret == dsn_ret_full)
3076 { Ustrcpy(p, US" RET=FULL"); p += 9; }
3080 string_format(p, sizeof(sx->buffer) - (p-sx->buffer), " ENVID=%s", dsn_envid);
3085 /* If an authenticated_sender override has been specified for this transport
3086 instance, expand it. If the expansion is forced to fail, and there was already
3087 an authenticated_sender for this message, the original value will be used.
3088 Other expansion failures are serious. An empty result is ignored, but there is
3089 otherwise no check - this feature is expected to be used with LMTP and other
3090 cases where non-standard addresses (e.g. without domains) might be required. */
3092 if (smtp_mail_auth_str(p, sizeof(sx->buffer) - (p-sx->buffer), addrlist, sx->conn_args.ob))
3100 build_rcptcmd_options(smtp_context * sx, const address_item * addr)
3102 uschar * p = sx->buffer;
3105 /* Add any DSN flags to the rcpt command */
3107 if (sx->peer_offered & OPTION_DSN && !(addr->dsn_flags & rf_dsnlasthop))
3109 if (addr->dsn_flags & rf_dsnflags)
3113 Ustrcpy(p, US" NOTIFY=");
3115 for (int i = 0; i < nelem(rf_list); i++) if (addr->dsn_flags & rf_list[i])
3117 if (!first) *p++ = ',';
3119 Ustrcpy(p, rf_names[i]);
3124 if (addr->dsn_orcpt)
3126 string_format(p, sizeof(sx->buffer) - (p-sx->buffer), " ORCPT=%s",
3137 0 good, rcpt results in addr->transport_return (PENDING_OK, DEFER, FAIL)
3138 -1 MAIL response error
3139 -2 any non-MAIL read i/o error
3140 -3 non-MAIL response timeout
3141 -4 internal error; channel still usable
3146 smtp_write_mail_and_rcpt_cmds(smtp_context * sx, int * yield)
3148 address_item * addr;
3152 if (build_mailcmd_options(sx, sx->first_addr) != OK)
3158 /* From here until we send the DATA command, we can make use of PIPELINING
3159 if the server host supports it. The code has to be able to check the responses
3160 at any point, for when the buffer fills up, so we write it totally generally.
3161 When PIPELINING is off, each command written reports that it has flushed the
3164 sx->pending_MAIL = TRUE; /* The block starts with MAIL */
3167 uschar * s = sx->from_addr;
3169 uschar * errstr = NULL;
3171 /* If we must downconvert, do the from-address here. Remember we had to
3172 for the to-addresses (done below), and also (ugly) for re-doing when building
3173 the delivery log line. */
3175 if ( sx->addrlist->prop.utf8_msg
3176 && (sx->addrlist->prop.utf8_downcvt || !(sx->peer_offered & OPTION_UTF8))
3179 if (s = string_address_utf8_to_alabel(s, &errstr), errstr)
3181 set_errno_nohost(sx->addrlist, ERRNO_EXPANDFAIL, errstr, DEFER, FALSE);
3185 setflag(sx->addrlist, af_utf8_downcvt);
3189 rc = smtp_write_command(sx, pipelining_active ? SCMD_BUFFER : SCMD_FLUSH,
3190 "MAIL FROM:<%s>%s\r\n", s, sx->buffer);
3193 mail_command = string_copy(big_buffer); /* Save for later error message */
3197 case -1: /* Transmission error */
3200 case +1: /* Cmd was sent */
3201 if (!smtp_read_response(sx, sx->buffer, sizeof(sx->buffer), '2',
3202 (SOB sx->conn_args.ob)->command_timeout))
3204 if (errno == 0 && sx->buffer[0] == '4')
3206 errno = ERRNO_MAIL4XX;
3207 sx->addrlist->more_errno |= ((sx->buffer[1] - '0')*10 + sx->buffer[2] - '0') << 8;
3211 sx->pending_MAIL = FALSE;
3214 /* otherwise zero: command queued for pipeline */
3217 /* Pass over all the relevant recipient addresses for this host, which are the
3218 ones that have status PENDING_DEFER. If we are using PIPELINING, we can send
3219 several before we have to read the responses for those seen so far. This
3220 checking is done by a subroutine because it also needs to be done at the end.
3221 Send only up to max_rcpt addresses at a time, leaving next_addr pointing to
3222 the next one if not all are sent.
3224 In the MUA wrapper situation, we want to flush the PIPELINING buffer for the
3225 last address because we want to abort if any recipients have any kind of
3226 problem, temporary or permanent. We know that all recipient addresses will have
3227 the PENDING_DEFER status, because only one attempt is ever made, and we know
3228 that max_rcpt will be large, so all addresses will be done at once.
3230 For verify we flush the pipeline after any (the only) rcpt address. */
3232 for (addr = sx->first_addr, address_count = 0;
3233 addr && address_count < sx->max_rcpt;
3234 addr = addr->next) if (addr->transport_return == PENDING_DEFER)
3240 addr->dsn_aware = sx->peer_offered & OPTION_DSN
3241 ? dsn_support_yes : dsn_support_no;
3244 no_flush = pipelining_active && !sx->verify
3245 && (!mua_wrapper || addr->next && address_count < sx->max_rcpt);
3247 build_rcptcmd_options(sx, addr);
3249 /* Now send the RCPT command, and process outstanding responses when
3250 necessary. After a timeout on RCPT, we just end the function, leaving the
3251 yield as OK, because this error can often mean that there is a problem with
3252 just one address, so we don't want to delay the host. */
3254 rcpt_addr = transport_rcpt_address(addr, sx->conn_args.tblock->rcpt_include_affixes);
3257 if ( testflag(sx->addrlist, af_utf8_downcvt)
3258 && !(rcpt_addr = string_address_utf8_to_alabel(rcpt_addr, NULL))
3261 /*XXX could we use a per-address errstr here? Not fail the whole send? */
3262 errno = ERRNO_EXPANDFAIL;
3263 return -5; /*XXX too harsh? */
3267 count = smtp_write_command(sx, no_flush ? SCMD_BUFFER : SCMD_FLUSH,
3268 "RCPT TO:<%s>%s%s\r\n", rcpt_addr, sx->igquotstr, sx->buffer);
3270 if (count < 0) return -5;
3273 switch(sync_responses(sx, count, 0))
3275 case 3: sx->ok = TRUE; /* 2xx & 5xx => OK & progress made */
3276 case 2: sx->completed_addr = TRUE; /* 5xx (only) => progress made */
3279 case 1: sx->ok = TRUE; /* 2xx (only) => OK, but if LMTP, */
3280 if (!sx->lmtp) /* can't tell about progress yet */
3281 sx->completed_addr = TRUE;
3282 case 0: /* No 2xx or 5xx, but no probs */
3285 case -1: return -3; /* Timeout on RCPT */
3286 case -2: return -2; /* non-MAIL read i/o error */
3287 default: return -1; /* any MAIL error */
3289 #ifdef SUPPORT_PIPE_CONNECT
3290 case -4: return -1; /* non-2xx for pipelined banner or EHLO */
3291 case -5: return -1; /* TLS first-read error */
3294 sx->pending_MAIL = FALSE; /* Dealt with MAIL */
3296 } /* Loop for next address */
3298 sx->next_addr = addr;
3304 /*****************************************************
3305 * Proxy TLS connection for another transport process *
3306 ******************************************************/
3308 Close the unused end of the pipe, fork once more, then use the given buffer
3309 as a staging area, and select on both the given fd and the TLS'd client-fd for
3310 data to read (per the coding in ip_recv() and fd_ready() this is legitimate).
3311 Do blocking full-size writes, and reads under a timeout. Once both input
3312 channels are closed, exit the process.
3316 buf space to use for buffering
3317 bufsiz size of buffer
3318 pfd pipe filedescriptor array; [0] is comms to proxied process
3319 timeout per-read timeout, seconds
3325 smtp_proxy_tls(void * ct_ctx, uschar * buf, size_t bsize, int * pfd,
3329 int max_fd = MAX(pfd[0], tls_out.active.sock) + 1;
3335 DEBUG(D_transport) debug_printf("proxy-proc final-pid %d\n", rc);
3336 _exit(rc < 0 ? EXIT_FAILURE : EXIT_SUCCESS);
3339 if (f.running_in_test_harness) millisleep(100); /* let parent debug out */
3340 set_process_info("proxying TLS connection for continued transport");
3342 FD_SET(tls_out.active.sock, &rfds);
3343 FD_SET(pfd[0], &rfds);
3345 for (int fd_bits = 3; fd_bits; )
3347 time_t time_left = timeout;
3348 time_t time_start = time(NULL);
3354 struct timeval tv = { time_left, 0 };
3357 (SELECT_ARG2_TYPE *)&rfds, NULL, (SELECT_ARG2_TYPE *)&efds, &tv);
3359 if (rc < 0 && errno == EINTR)
3360 if ((time_left -= time(NULL) - time_start) > 0) continue;
3364 DEBUG(D_transport) if (rc == 0) debug_printf("%s: timed out\n", __FUNCTION__);
3368 if (FD_ISSET(tls_out.active.sock, &efds) || FD_ISSET(pfd[0], &efds))
3370 DEBUG(D_transport) debug_printf("select: exceptional cond on %s fd\n",
3371 FD_ISSET(pfd[0], &efds) ? "proxy" : "tls");
3375 while (rc < 0 || !(FD_ISSET(tls_out.active.sock, &rfds) || FD_ISSET(pfd[0], &rfds)));
3377 /* handle inbound data */
3378 if (FD_ISSET(tls_out.active.sock, &rfds))
3379 if ((rc = tls_read(ct_ctx, buf, bsize)) <= 0)
3382 FD_CLR(tls_out.active.sock, &rfds);
3383 shutdown(pfd[0], SHUT_WR);
3388 for (int nbytes = 0; rc - nbytes > 0; nbytes += i)
3389 if ((i = write(pfd[0], buf + nbytes, rc - nbytes)) < 0) goto done;
3391 else if (fd_bits & 1)
3392 FD_SET(tls_out.active.sock, &rfds);
3394 /* handle outbound data */
3395 if (FD_ISSET(pfd[0], &rfds))
3396 if ((rc = read(pfd[0], buf, bsize)) <= 0)
3399 tls_close(ct_ctx, TLS_SHUTDOWN_NOWAIT);
3404 for (int nbytes = 0; rc - nbytes > 0; nbytes += i)
3405 if ((i = tls_write(ct_ctx, buf + nbytes, rc - nbytes, FALSE)) < 0)
3408 else if (fd_bits & 2)
3409 FD_SET(pfd[0], &rfds);
3413 if (f.running_in_test_harness) millisleep(100); /* let logging complete */
3414 exim_exit(0, US"TLS proxy");
3419 /*************************************************
3420 * Deliver address list to given host *
3421 *************************************************/
3423 /* If continue_hostname is not null, we get here only when continuing to
3424 deliver down an existing channel. The channel was passed as the standard
3425 input. TLS is never active on a passed channel; the previous process always
3426 closes it down before passing the connection on.
3428 Otherwise, we have to make a connection to the remote host, and do the
3429 initial protocol exchange.
3431 When running as an MUA wrapper, if the sender or any recipient is rejected,
3432 temporarily or permanently, we force failure for all recipients.
3435 addrlist chain of potential addresses to deliver; only those whose
3436 transport_return field is set to PENDING_DEFER are currently
3437 being processed; others should be skipped - they have either
3438 been delivered to an earlier host or IP address, or been
3439 failed by one of them.
3440 host host to deliver to
3441 host_af AF_INET or AF_INET6
3442 defport default TCP/IP port to use if host does not specify, in host
3444 interface interface to bind to, or NULL
3445 tblock transport instance block
3446 message_defer set TRUE if yield is OK, but all addresses were deferred
3447 because of a non-recipient, non-host failure, that is, a
3448 4xx response to MAIL FROM, DATA, or ".". This is a defer
3449 that is specific to the message.
3450 suppress_tls if TRUE, don't attempt a TLS connection - this is set for
3451 a second attempt after TLS initialization fails
3453 Returns: OK - the connection was made and the delivery attempted;
3454 the result for each address is in its data block.
3455 DEFER - the connection could not be made, or something failed
3456 while setting up the SMTP session, or there was a
3457 non-message-specific error, such as a timeout.
3458 ERROR - a filter command is specified for this transport,
3459 and there was a problem setting it up; OR helo_data
3460 or add_headers or authenticated_sender is specified
3461 for this transport, and the string failed to expand
3465 smtp_deliver(address_item *addrlist, host_item *host, int host_af, int defport,
3466 uschar *interface, transport_instance *tblock,
3467 BOOL *message_defer, BOOL suppress_tls)
3469 smtp_transport_options_block * ob = SOB tblock->options_block;
3473 struct timeval start_delivery_time;
3475 BOOL pass_message = FALSE;
3476 uschar *message = NULL;
3477 uschar new_message_id[MESSAGE_ID_LENGTH + 1];
3481 gettimeofday(&start_delivery_time, NULL);
3482 suppress_tls = suppress_tls; /* stop compiler warning when no TLS support */
3483 *message_defer = FALSE;
3485 sx.addrlist = addrlist;
3486 sx.conn_args.host = host;
3487 sx.conn_args.host_af = host_af,
3489 sx.conn_args.interface = interface;
3490 sx.helo_data = NULL;
3491 sx.conn_args.tblock = tblock;
3493 sx.sync_addr = sx.first_addr = addrlist;
3495 /* Get the channel set up ready for a message (MAIL FROM being the next
3496 SMTP command to send */
3498 if ((rc = smtp_setup_conn(&sx, suppress_tls)) != OK)
3501 /* If there is a filter command specified for this transport, we can now
3502 set it up. This cannot be done until the identify of the host is known. */
3504 if (tblock->filter_command)
3506 transport_filter_timeout = tblock->filter_timeout;
3508 /* On failure, copy the error to all addresses, abandon the SMTP call, and
3511 if (!transport_set_up_command(&transport_filter_argv,
3512 tblock->filter_command, TRUE, DEFER, addrlist,
3513 string_sprintf("%.50s transport", tblock->name), NULL))
3515 set_errno_nohost(addrlist->next, addrlist->basic_errno, addrlist->message, DEFER,
3521 if ( transport_filter_argv
3522 && *transport_filter_argv
3523 && **transport_filter_argv
3524 && sx.peer_offered & OPTION_CHUNKING
3527 sx.peer_offered &= ~OPTION_CHUNKING;
3528 DEBUG(D_transport) debug_printf("CHUNKING not usable due to transport filter\n");
3532 /* For messages that have more than the maximum number of envelope recipients,
3533 we want to send several transactions down the same SMTP connection. (See
3534 comments in deliver.c as to how this reconciles, heuristically, with
3535 remote_max_parallel.) This optimization was added to Exim after the following
3536 code was already working. The simplest way to put it in without disturbing the
3537 code was to use a goto to jump back to this point when there is another
3538 transaction to handle. */
3541 sx.from_addr = return_path;
3542 sx.sync_addr = sx.first_addr;
3544 sx.send_rset = TRUE;
3545 sx.completed_addr = FALSE;
3548 /* If we are a continued-connection-after-verify the MAIL and RCPT
3549 commands were already sent; do not re-send but do mark the addrs as
3550 having been accepted up to RCPT stage. A traditional cont-conn
3551 always has a sequence number greater than one. */
3553 if (continue_hostname && continue_sequence == 1)
3555 sx.peer_offered = smtp_peer_options;
3556 sx.pending_MAIL = FALSE;
3558 sx.next_addr = NULL;
3560 for (address_item * addr = addrlist; addr; addr = addr->next)
3561 addr->transport_return = PENDING_OK;
3565 /* Initiate a message transfer. */
3567 switch(smtp_write_mail_and_rcpt_cmds(&sx, &yield))
3570 case -1: case -2: goto RESPONSE_FAILED;
3571 case -3: goto END_OFF;
3572 case -4: goto SEND_QUIT;
3573 default: goto SEND_FAILED;
3576 /* If we are an MUA wrapper, abort if any RCPTs were rejected, either
3577 permanently or temporarily. We should have flushed and synced after the last
3585 for (a = sx.first_addr, cnt = 0; a && cnt < sx.max_rcpt; a = a->next, cnt++)
3586 if (a->transport_return != PENDING_OK)
3588 /*XXX could we find a better errno than 0 here? */
3589 set_errno_nohost(addrlist, 0, a->message, FAIL,
3590 testflag(a, af_pass_message));
3597 /* If ok is TRUE, we know we have got at least one good recipient, and must now
3598 send DATA, but if it is FALSE (in the normal, non-wrapper case), we may still
3599 have a good recipient buffered up if we are pipelining. We don't want to waste
3600 time sending DATA needlessly, so we only send it if either ok is TRUE or if we
3601 are pipelining. The responses are all handled by sync_responses().
3602 If using CHUNKING, do not send a BDAT until we know how big a chunk we want
3605 if ( !(sx.peer_offered & OPTION_CHUNKING)
3606 && (sx.ok || (pipelining_active && !mua_wrapper)))
3608 int count = smtp_write_command(&sx, SCMD_FLUSH, "DATA\r\n");
3610 if (count < 0) goto SEND_FAILED;
3611 switch(sync_responses(&sx, count, sx.ok ? +1 : -1))
3613 case 3: sx.ok = TRUE; /* 2xx & 5xx => OK & progress made */
3614 case 2: sx.completed_addr = TRUE; /* 5xx (only) => progress made */
3617 case 1: sx.ok = TRUE; /* 2xx (only) => OK, but if LMTP, */
3618 if (!sx.lmtp) sx.completed_addr = TRUE; /* can't tell about progress yet */
3619 case 0: break; /* No 2xx or 5xx, but no probs */
3621 case -1: goto END_OFF; /* Timeout on RCPT */
3623 #ifdef SUPPORT_PIPE_CONNECT
3624 case -5: /* TLS first-read error */
3625 case -4: HDEBUG(D_transport)
3626 debug_printf("failed reaping pipelined cmd responses\n");
3628 default: goto RESPONSE_FAILED; /* I/O error, or any MAIL/DATA error */
3630 pipelining_active = FALSE;
3631 data_command = string_copy(big_buffer); /* Save for later error message */
3634 /* If there were no good recipients (but otherwise there have been no
3635 problems), just set ok TRUE, since we have handled address-specific errors
3636 already. Otherwise, it's OK to send the message. Use the check/escape mechanism
3637 for handling the SMTP dot-handling protocol, flagging to apply to headers as
3638 well as body. Set the appropriate timeout value to be used for each chunk.
3639 (Haven't been able to make it work using select() for writing yet.) */
3641 if (!(sx.peer_offered & OPTION_CHUNKING) && !sx.ok)
3643 /* Save the first address of the next batch. */
3644 sx.first_addr = sx.next_addr;
3650 transport_ctx tctx = {
3651 .u = {.fd = sx.cctx.sock}, /*XXX will this need TLS info? */
3654 .check_string = US".",
3655 .escape_string = US"..", /* Escaping strings */
3657 topt_use_crlf | topt_escape_headers
3658 | (tblock->body_only ? topt_no_headers : 0)
3659 | (tblock->headers_only ? topt_no_body : 0)
3660 | (tblock->return_path_add ? topt_add_return_path : 0)
3661 | (tblock->delivery_date_add ? topt_add_delivery_date : 0)
3662 | (tblock->envelope_to_add ? topt_add_envelope_to : 0)
3665 /* If using CHUNKING we need a callback from the generic transport
3666 support to us, for the sending of BDAT smtp commands and the reaping
3667 of responses. The callback needs a whole bunch of state so set up
3668 a transport-context structure to be passed around. */
3670 if (sx.peer_offered & OPTION_CHUNKING)
3672 tctx.check_string = tctx.escape_string = NULL;
3673 tctx.options |= topt_use_bdat;
3674 tctx.chunk_cb = smtp_chunk_cmd_callback;
3675 sx.pending_BDAT = FALSE;
3676 sx.good_RCPT = sx.ok;
3678 tctx.smtp_context = &sx;
3681 tctx.options |= topt_end_dot;
3683 /* Save the first address of the next batch. */
3684 sx.first_addr = sx.next_addr;
3686 /* Responses from CHUNKING commands go in buffer. Otherwise,
3687 there has not been a response. */
3691 sigalrm_seen = FALSE;
3692 transport_write_timeout = ob->data_timeout;
3693 smtp_command = US"sending data block"; /* For error messages */
3694 DEBUG(D_transport|D_v)
3695 if (sx.peer_offered & OPTION_CHUNKING)
3696 debug_printf(" will write message using CHUNKING\n");
3698 debug_printf(" SMTP>> writing message and terminating \".\"\n");
3699 transport_count = 0;
3701 #ifndef DISABLE_DKIM
3702 dkim_exim_sign_init();
3703 # ifdef EXPERIMENTAL_ARC
3705 uschar * s = ob->arc_sign;
3708 if (!(ob->dkim.arc_signspec = s = expand_string(s)))
3710 if (!f.expand_string_forcedfail)
3712 message = US"failed to expand arc_sign";
3719 /* Ask dkim code to hash the body for ARC */
3720 (void) arc_ams_setup_sign_bodyhash();
3721 ob->dkim.force_bodyhash = TRUE;
3726 sx.ok = dkim_transport_write_message(&tctx, &ob->dkim, CUSS &message);
3728 sx.ok = transport_write_message(&tctx, 0);
3731 /* transport_write_message() uses write() because it is called from other
3732 places to write to non-sockets. This means that under some OS (e.g. Solaris)
3733 it can exit with "Broken pipe" as its error. This really means that the
3734 socket got closed at the far end. */
3736 transport_write_timeout = 0; /* for subsequent transports */
3738 /* Failure can either be some kind of I/O disaster (including timeout),
3739 or the failure of a transport filter or the expansion of added headers.
3740 Or, when CHUNKING, it can be a protocol-detected failure. */
3743 if (message) goto SEND_FAILED;
3744 else goto RESPONSE_FAILED;
3746 /* We used to send the terminating "." explicitly here, but because of
3747 buffering effects at both ends of TCP/IP connections, you don't gain
3748 anything by keeping it separate, so it might as well go in the final
3749 data buffer for efficiency. This is now done by setting the topt_end_dot
3752 smtp_command = US"end of data";
3754 if (sx.peer_offered & OPTION_CHUNKING && sx.cmd_count > 1)
3756 /* Reap any outstanding MAIL & RCPT commands, but not a DATA-go-ahead */
3757 switch(sync_responses(&sx, sx.cmd_count-1, 0))
3759 case 3: sx.ok = TRUE; /* 2xx & 5xx => OK & progress made */
3760 case 2: sx.completed_addr = TRUE; /* 5xx (only) => progress made */
3763 case 1: sx.ok = TRUE; /* 2xx (only) => OK, but if LMTP, */
3764 if (!sx.lmtp) sx.completed_addr = TRUE; /* can't tell about progress yet */
3765 case 0: break; /* No 2xx or 5xx, but no probs */
3767 case -1: goto END_OFF; /* Timeout on RCPT */
3769 #ifdef SUPPORT_PIPE_CONNECT
3770 case -5: /* TLS first-read error */
3771 case -4: HDEBUG(D_transport)
3772 debug_printf("failed reaping pipelined cmd responses\n");
3774 default: goto RESPONSE_FAILED; /* I/O error, or any MAIL/DATA error */
3778 #ifndef DISABLE_PRDR
3779 /* For PRDR we optionally get a partial-responses warning followed by the
3780 individual responses, before going on with the overall response. If we don't
3781 get the warning then deal with per non-PRDR. */
3785 sx.ok = smtp_read_response(&sx, sx.buffer, sizeof(sx.buffer), '3', ob->final_timeout);
3786 if (!sx.ok && errno == 0) switch(sx.buffer[0])
3788 case '2': sx.prdr_active = FALSE;
3791 case '4': errno = ERRNO_DATA4XX;
3792 addrlist->more_errno |=
3793 ((sx.buffer[1] - '0')*10 + sx.buffer[2] - '0') << 8;
3800 /* For non-PRDR SMTP, we now read a single response that applies to the
3801 whole message. If it is OK, then all the addresses have been delivered. */
3805 sx.ok = smtp_read_response(&sx, sx.buffer, sizeof(sx.buffer), '2',
3807 if (!sx.ok && errno == 0 && sx.buffer[0] == '4')
3809 errno = ERRNO_DATA4XX;
3810 addrlist->more_errno |= ((sx.buffer[1] - '0')*10 + sx.buffer[2] - '0') << 8;
3814 /* For LMTP, we get back a response for every RCPT command that we sent;
3815 some may be accepted and some rejected. For those that get a response, their
3816 status is fixed; any that are accepted have been handed over, even if later
3817 responses crash - at least, that's how I read RFC 2033.
3819 If all went well, mark the recipient addresses as completed, record which
3820 host/IPaddress they were delivered to, and cut out RSET when sending another
3821 message down the same channel. Write the completed addresses to the journal
3822 now so that they are recorded in case there is a crash of hardware or
3823 software before the spool gets updated. Also record the final SMTP
3824 confirmation if needed (for SMTP only). */
3829 struct timeval delivery_time;
3831 uschar * conf = NULL;
3833 timesince(&delivery_time, &start_delivery_time);
3834 sx.send_rset = FALSE;
3835 pipelining_active = FALSE;
3837 /* Set up confirmation if needed - applies only to SMTP */
3840 #ifdef DISABLE_EVENT
3841 LOGGING(smtp_confirmation) &&
3846 const uschar *s = string_printing(sx.buffer);
3847 /* deconst cast ok here as string_printing was checked to have alloc'n'copied */
3848 conf = (s == sx.buffer)? US string_copy(s) : US s;
3851 /* Process all transported addresses - for LMTP or PRDR, read a status for
3854 for (address_item * addr = addrlist; addr != sx.first_addr; addr = addr->next)
3856 if (addr->transport_return != PENDING_OK) continue;
3858 /* LMTP - if the response fails badly (e.g. timeout), use it for all the
3859 remaining addresses. Otherwise, it's a return code for just the one
3860 address. For temporary errors, add a retry item for the address so that
3861 it doesn't get tried again too soon. */
3863 #ifndef DISABLE_PRDR
3864 if (sx.lmtp || sx.prdr_active)
3869 if (!smtp_read_response(&sx, sx.buffer, sizeof(sx.buffer), '2',
3872 if (errno != 0 || sx.buffer[0] == 0) goto RESPONSE_FAILED;
3873 addr->message = string_sprintf(
3874 #ifndef DISABLE_PRDR
3875 "%s error after %s: %s", sx.prdr_active ? "PRDR":"LMTP",
3877 "LMTP error after %s: %s",
3879 data_command, string_printing(sx.buffer));
3880 setflag(addr, af_pass_message); /* Allow message to go to user */
3881 if (sx.buffer[0] == '5')
3882 addr->transport_return = FAIL;
3885 errno = ERRNO_DATA4XX;
3886 addr->more_errno |= ((sx.buffer[1] - '0')*10 + sx.buffer[2] - '0') << 8;
3887 addr->transport_return = DEFER;
3888 #ifndef DISABLE_PRDR
3889 if (!sx.prdr_active)
3891 retry_add_item(addr, addr->address_retry_key, 0);
3895 sx.completed_addr = TRUE; /* NOW we can set this flag */
3896 if (LOGGING(smtp_confirmation))
3898 const uschar *s = string_printing(sx.buffer);
3899 /* deconst cast ok here as string_printing was checked to have alloc'n'copied */
3900 conf = (s == sx.buffer) ? US string_copy(s) : US s;
3904 /* SMTP, or success return from LMTP for this address. Pass back the
3905 actual host that was used. */
3907 addr->transport_return = OK;
3908 addr->more_errno = delivery_time.tv_sec;
3909 addr->delivery_usec = delivery_time.tv_usec;
3910 addr->host_used = host;
3911 addr->special_action = flag;
3912 addr->message = conf;
3914 if (tcp_out_fastopen)
3916 setflag(addr, af_tcp_fastopen_conn);
3917 if (tcp_out_fastopen >= TFO_USED_NODATA) setflag(addr, af_tcp_fastopen);
3918 if (tcp_out_fastopen >= TFO_USED_DATA) setflag(addr, af_tcp_fastopen_data);
3920 if (sx.pipelining_used) setflag(addr, af_pipelining);
3921 #ifdef SUPPORT_PIPE_CONNECT
3922 if (sx.early_pipe_active) setflag(addr, af_early_pipe);
3924 #ifndef DISABLE_PRDR
3925 if (sx.prdr_active) setflag(addr, af_prdr_used);
3927 if (sx.peer_offered & OPTION_CHUNKING) setflag(addr, af_chunking_used);
3930 #ifndef DISABLE_PRDR
3931 if (!sx.prdr_active)
3934 /* Update the journal. For homonymic addresses, use the base address plus
3935 the transport name. See lots of comments in deliver.c about the reasons
3936 for the complications when homonyms are involved. Just carry on after
3937 write error, as it may prove possible to update the spool file later. */
3939 if (testflag(addr, af_homonym))
3940 sprintf(CS sx.buffer, "%.500s/%s\n", addr->unique + 3, tblock->name);
3942 sprintf(CS sx.buffer, "%.500s\n", addr->unique);
3944 DEBUG(D_deliver) debug_printf("S:journalling %s\n", sx.buffer);
3945 len = Ustrlen(CS sx.buffer);
3946 if (write(journal_fd, sx.buffer, len) != len)
3947 log_write(0, LOG_MAIN|LOG_PANIC, "failed to write journal for "
3948 "%s: %s", sx.buffer, strerror(errno));
3952 #ifndef DISABLE_PRDR
3955 const uschar * overall_message;
3957 /* PRDR - get the final, overall response. For any non-success
3958 upgrade all the address statuses. */
3960 sx.ok = smtp_read_response(&sx, sx.buffer, sizeof(sx.buffer), '2',
3964 if(errno == 0 && sx.buffer[0] == '4')
3966 errno = ERRNO_DATA4XX;
3967 addrlist->more_errno |= ((sx.buffer[1] - '0')*10 + sx.buffer[2] - '0') << 8;
3969 for (address_item * addr = addrlist; addr != sx.first_addr; addr = addr->next)
3970 if (sx.buffer[0] == '5' || addr->transport_return == OK)
3971 addr->transport_return = PENDING_OK; /* allow set_errno action */
3972 goto RESPONSE_FAILED;
3975 /* Append the overall response to the individual PRDR response for logging
3976 and update the journal, or setup retry. */
3978 overall_message = string_printing(sx.buffer);
3979 for (address_item * addr = addrlist; addr != sx.first_addr; addr = addr->next)
3980 if (addr->transport_return == OK)
3981 addr->message = string_sprintf("%s\\n%s", addr->message, overall_message);
3983 for (address_item * addr = addrlist; addr != sx.first_addr; addr = addr->next)
3984 if (addr->transport_return == OK)
3986 if (testflag(addr, af_homonym))
3987 sprintf(CS sx.buffer, "%.500s/%s\n", addr->unique + 3, tblock->name);
3989 sprintf(CS sx.buffer, "%.500s\n", addr->unique);
3991 DEBUG(D_deliver) debug_printf("journalling(PRDR) %s\n", sx.buffer);
3992 len = Ustrlen(CS sx.buffer);
3993 if (write(journal_fd, sx.buffer, len) != len)
3994 log_write(0, LOG_MAIN|LOG_PANIC, "failed to write journal for "
3995 "%s: %s", sx.buffer, strerror(errno));
3997 else if (addr->transport_return == DEFER)
3998 retry_add_item(addr, addr->address_retry_key, -2);
4002 /* Ensure the journal file is pushed out to disk. */
4004 if (EXIMfsync(journal_fd) < 0)
4005 log_write(0, LOG_MAIN|LOG_PANIC, "failed to fsync journal: %s",
4011 /* Handle general (not specific to one address) failures here. The value of ok
4012 is used to skip over this code on the falling through case. A timeout causes a
4013 deferral. Other errors may defer or fail according to the response code, and
4014 may set up a special errno value, e.g. after connection chopped, which is
4015 assumed if errno == 0 and there is no text in the buffer. If control reaches
4016 here during the setting up phase (i.e. before MAIL FROM) then always defer, as
4017 the problem is not related to this specific message. */
4022 uschar * set_message;
4028 sx.send_quit = check_response(host, &save_errno, addrlist->more_errno,
4029 sx.buffer, &code, &message, &pass_message);
4037 message = string_sprintf("send() to %s [%s] failed: %s",
4038 host->name, host->address, message ? message : US strerror(save_errno));
4039 sx.send_quit = FALSE;
4047 sx.ok = FALSE; /* For when reached by GOTO */
4048 set_message = message;
4050 /* We want to handle timeouts after MAIL or "." and loss of connection after
4051 "." specially. They can indicate a problem with the sender address or with
4052 the contents of the message rather than a real error on the connection. These
4053 cases are treated in the same way as a 4xx response. This next bit of code
4054 does the classification. */
4061 message_error = TRUE;
4065 message_error = Ustrncmp(smtp_command,"MAIL",4) == 0 ||
4066 Ustrncmp(smtp_command,"end ",4) == 0;
4069 case ERRNO_SMTPCLOSED:
4070 message_error = Ustrncmp(smtp_command,"end ",4) == 0;
4074 message_error = FALSE;
4078 /* Handle the cases that are treated as message errors. These are:
4080 (a) negative response or timeout after MAIL
4081 (b) negative response after DATA
4082 (c) negative response or timeout or dropped connection after "."
4083 (d) utf8 support required and not offered
4085 It won't be a negative response or timeout after RCPT, as that is dealt
4086 with separately above. The action in all cases is to set an appropriate
4087 error code for all the addresses, but to leave yield set to OK because the
4088 host itself has not failed. Of course, it might in practice have failed
4089 when we've had a timeout, but if so, we'll discover that at the next
4090 delivery attempt. For a temporary error, set the message_defer flag, and
4091 write to the logs for information if this is not the last host. The error
4092 for the last host will be logged as part of the address's log line. */
4096 if (mua_wrapper) code = '5'; /* Force hard failure in wrapper mode */
4098 /* If there's an errno, the message contains just the identity of
4103 else /* Anything other than 5 is treated as temporary */
4107 message = US string_sprintf("%s: %s", message, strerror(save_errno));
4109 write_logs(host, message, sx.first_addr ? sx.first_addr->basic_errno : 0);
4111 *message_defer = TRUE;
4115 /* Otherwise, we have an I/O error or a timeout other than after MAIL or
4116 ".", or some other transportation error. We defer all addresses and yield
4117 DEFER, except for the case of failed add_headers expansion, or a transport
4118 filter failure, when the yield should be ERROR, to stop it trying other
4123 #ifdef SUPPORT_PIPE_CONNECT
4124 /* If we were early-pipelinng and the actual EHLO response did not match
4125 the cached value we assumed, we could have detected it and passed a
4126 custom errno through to here. It would be nice to RSET and retry right
4127 away, but to reliably do that we eould need an extra synch point before
4128 we committed to data and that would discard half the gained roundrips.
4129 Or we could summarily drop the TCP connection. but that is also ugly.
4130 Instead, we ignore the possibility (having freshened the cache) and rely
4131 on the server telling us with a nonmessage error if we have tried to
4132 do something it no longer supports. */
4135 yield = (save_errno == ERRNO_CHHEADER_FAIL ||
4136 save_errno == ERRNO_FILTER_FAIL) ? ERROR : DEFER;
4140 set_errno(addrlist, save_errno, set_message, set_rc, pass_message, host
4141 #ifdef EXPERIMENTAL_DSN_INFO
4142 , sx.smtp_greeting, sx.helo_response
4148 /* If all has gone well, send_quit will be set TRUE, implying we can end the
4149 SMTP session tidily. However, if there were too many addresses to send in one
4150 message (indicated by first_addr being non-NULL) we want to carry on with the
4151 rest of them. Also, it is desirable to send more than one message down the SMTP
4152 connection if there are several waiting, provided we haven't already sent so
4153 many as to hit the configured limit. The function transport_check_waiting looks
4154 for a waiting message and returns its id. Then transport_pass_socket tries to
4155 set up a continued delivery by passing the socket on to another process. The
4156 variable send_rset is FALSE if a message has just been successfully transferred.
4158 If we are already sending down a continued channel, there may be further
4159 addresses not yet delivered that are aimed at the same host, but which have not
4160 been passed in this run of the transport. In this case, continue_more will be
4161 true, and all we should do is send RSET if necessary, and return, leaving the
4164 However, if no address was disposed of, i.e. all addresses got 4xx errors, we
4165 do not want to continue with other messages down the same channel, because that
4166 can lead to looping between two or more messages, all with the same,
4167 temporarily failing address(es). [The retry information isn't updated yet, so
4168 new processes keep on trying.] We probably also don't want to try more of this
4169 message's addresses either.
4171 If we have started a TLS session, we have to end it before passing the
4172 connection to a new process. However, not all servers can handle this (Exim
4173 can), so we do not pass such a connection on if the host matches
4174 hosts_nopass_tls. */
4177 debug_printf("ok=%d send_quit=%d send_rset=%d continue_more=%d "
4178 "yield=%d first_address is %sNULL\n", sx.ok, sx.send_quit,
4179 sx.send_rset, f.continue_more, yield, sx.first_addr ? "not " : "");
4181 if (sx.completed_addr && sx.ok && sx.send_quit)
4184 smtp_compare_t t_compare;
4186 t_compare.tblock = tblock;
4187 t_compare.current_sender_address = sender_address;
4189 if ( sx.first_addr != NULL
4193 ( tls_out.active.sock < 0 && !continue_proxy_cipher
4194 || verify_check_given_host(CUSS &ob->hosts_nopass_tls, host) != OK
4198 transport_check_waiting(tblock->name, host->name,
4199 tblock->connection_max_messages, new_message_id, &more,
4200 (oicf)smtp_are_same_identities, (void*)&t_compare)
4207 if (! (sx.ok = smtp_write_command(&sx, SCMD_FLUSH, "RSET\r\n") >= 0))
4209 msg = US string_sprintf("send() to %s [%s] failed: %s", host->name,
4210 host->address, strerror(errno));
4211 sx.send_quit = FALSE;
4213 else if (! (sx.ok = smtp_read_response(&sx, sx.buffer, sizeof(sx.buffer),
4214 '2', ob->command_timeout)))
4217 sx.send_quit = check_response(host, &errno, 0, sx.buffer, &code, &msg,
4221 DEBUG(D_transport) debug_printf("H=%s [%s] %s\n",
4222 host->name, host->address, msg);
4226 /* Either RSET was not needed, or it succeeded */
4233 int socket_fd = sx.cctx.sock;
4236 if (sx.first_addr != NULL) /* More addresses still to be sent */
4237 { /* in this run of the transport */
4238 continue_sequence++; /* Causes * in logging */
4242 /* Unless caller said it already has more messages listed for this host,
4243 pass the connection on to a new Exim process (below, the call to
4244 transport_pass_socket). If the caller has more ready, just return with
4245 the connection still open. */
4248 if (tls_out.active.sock >= 0)
4249 if ( f.continue_more
4250 || verify_check_given_host(CUSS &ob->hosts_noproxy_tls, host) == OK)
4252 /* Before passing the socket on, or returning to caller with it still
4253 open, we must shut down TLS. Not all MTAs allow for the continuation
4254 of the SMTP session when TLS is shut down. We test for this by sending
4255 a new EHLO. If we don't get a good response, we don't attempt to pass
4258 tls_close(sx.cctx.tls_ctx, TLS_SHUTDOWN_WAIT);
4259 sx.cctx.tls_ctx = NULL;
4260 smtp_peer_options = smtp_peer_options_wrap;
4262 && smtp_write_command(&sx, SCMD_FLUSH, "EHLO %s\r\n", sx.helo_data)
4264 && smtp_read_response(&sx, sx.buffer, sizeof(sx.buffer),
4265 '2', ob->command_timeout);
4267 if (sx.ok && f.continue_more)
4268 return yield; /* More addresses for another run */
4272 /* Set up a pipe for proxying TLS for the new transport process */
4274 smtp_peer_options |= OPTION_TLS;
4275 if (sx.ok = (socketpair(AF_UNIX, SOCK_STREAM, 0, pfd) == 0))
4278 set_errno(sx.first_addr, errno, US"internal allocation problem",
4280 # ifdef EXPERIMENTAL_DSN_INFO
4281 , sx.smtp_greeting, sx.helo_response
4287 if (f.continue_more)
4288 return yield; /* More addresses for another run */
4290 /* If the socket is successfully passed, we mustn't send QUIT (or
4291 indeed anything!) from here. */
4293 /*XXX DSN_INFO: assume likely to do new HELO; but for greet we'll want to
4294 propagate it from the initial
4296 if (sx.ok && transport_pass_socket(tblock->name, host->name,
4297 host->address, new_message_id, socket_fd))
4299 sx.send_quit = FALSE;
4301 /* We have passed the client socket to a fresh transport process.
4302 If TLS is still active, we need to proxy it for the transport we
4303 just passed the baton to. Fork a child to to do it, and return to
4304 get logging done asap. Which way to place the work makes assumptions
4305 about post-fork prioritisation which may not hold on all platforms. */
4307 if (tls_out.active.sock >= 0)
4310 if (pid == 0) /* child; fork again to disconnect totally */
4312 if (f.running_in_test_harness) millisleep(100); /* let parent debug out */
4313 /* does not return */
4314 smtp_proxy_tls(sx.cctx.tls_ctx, sx.buffer, sizeof(sx.buffer), pfd,
4315 ob->command_timeout);
4318 if (pid > 0) /* parent */
4320 DEBUG(D_transport) debug_printf("proxy-proc inter-pid %d\n", pid);
4322 /* tidy the inter-proc to disconn the proxy proc */
4323 waitpid(pid, NULL, 0);
4324 tls_close(sx.cctx.tls_ctx, TLS_NO_SHUTDOWN);
4325 sx.cctx.tls_ctx = NULL;
4326 (void)close(sx.cctx.sock);
4328 continue_transport = NULL;
4329 continue_hostname = NULL;
4332 log_write(0, LOG_PANIC_DIE, "fork failed");
4338 /* If RSET failed and there are addresses left, they get deferred. */
4340 set_errno(sx.first_addr, errno, msg, DEFER, FALSE, host
4341 #ifdef EXPERIMENTAL_DSN_INFO
4342 , sx.smtp_greeting, sx.helo_response
4348 /* End off tidily with QUIT unless the connection has died or the socket has
4349 been passed to another process. There has been discussion on the net about what
4350 to do after sending QUIT. The wording of the RFC suggests that it is necessary
4351 to wait for a response, but on the other hand, there isn't anything one can do
4352 with an error response, other than log it. Exim used to do that. However,
4353 further discussion suggested that it is positively advantageous not to wait for
4354 the response, but to close the session immediately. This is supposed to move
4355 the TCP/IP TIME_WAIT state from the server to the client, thereby removing some
4356 load from the server. (Hosts that are both servers and clients may not see much
4357 difference, of course.) Further discussion indicated that this was safe to do
4358 on Unix systems which have decent implementations of TCP/IP that leave the
4359 connection around for a while (TIME_WAIT) after the application has gone away.
4360 This enables the response sent by the server to be properly ACKed rather than
4361 timed out, as can happen on broken TCP/IP implementations on other OS.
4363 This change is being made on 31-Jul-98. After over a year of trouble-free
4364 operation, the old commented-out code was removed on 17-Sep-99. */
4368 (void) setsockopt(sx.cctx.sock, IPPROTO_TCP, TCP_CORK, US &on, sizeof(on));
4370 if (sx.send_quit) (void)smtp_write_command(&sx, SCMD_FLUSH, "QUIT\r\n");
4375 tls_close(sx.cctx.tls_ctx, TLS_SHUTDOWN_NOWAIT);
4376 sx.cctx.tls_ctx = NULL;
4379 /* Close the socket, and return the appropriate value, first setting
4380 works because the NULL setting is passed back to the calling process, and
4381 remote_max_parallel is forced to 1 when delivering over an existing connection,
4383 If all went well and continue_more is set, we shouldn't actually get here if
4384 there are further addresses, as the return above will be taken. However,
4385 writing RSET might have failed, or there may be other addresses whose hosts are
4386 specified in the transports, and therefore not visible at top level, in which
4387 case continue_more won't get set. */
4389 HDEBUG(D_transport|D_acl|D_v) debug_printf_indent(" SMTP(close)>>\n");
4392 shutdown(sx.cctx.sock, SHUT_WR);
4393 millisleep(f.running_in_test_harness ? 200 : 20);
4394 if (fcntl(sx.cctx.sock, F_SETFL, O_NONBLOCK) == 0)
4395 for (int i = 16; read(sx.cctx.sock, sx.inbuffer, sizeof(sx.inbuffer)) > 0 && i > 0;)
4396 i--; /* drain socket */
4398 (void)close(sx.cctx.sock);
4400 #ifndef DISABLE_EVENT
4401 (void) event_raise(tblock->event_action, US"tcp:close", NULL);
4404 continue_transport = NULL;
4405 continue_hostname = NULL;
4412 /*************************************************
4413 * Closedown entry point *
4414 *************************************************/
4416 /* This function is called when exim is passed an open smtp channel
4417 from another incarnation, but the message which it has been asked
4418 to deliver no longer exists. The channel is on stdin.
4420 We might do fancy things like looking for another message to send down
4421 the channel, but if the one we sought has gone, it has probably been
4422 delivered by some other process that itself will seek further messages,
4423 so just close down our connection.
4425 Argument: pointer to the transport instance block
4430 smtp_transport_closedown(transport_instance *tblock)
4432 smtp_transport_options_block * ob = SOB tblock->options_block;
4433 client_conn_ctx cctx;
4436 uschar inbuffer[4096];
4437 uschar outbuffer[16];
4439 /*XXX really we need an active-smtp-client ctx, rather than assuming stdout */
4440 cctx.sock = fileno(stdin);
4441 cctx.tls_ctx = cctx.sock == tls_out.active.sock ? tls_out.active.tls_ctx : NULL;
4443 sx.inblock.cctx = &cctx;
4444 sx.inblock.buffer = inbuffer;
4445 sx.inblock.buffersize = sizeof(inbuffer);
4446 sx.inblock.ptr = inbuffer;
4447 sx.inblock.ptrend = inbuffer;
4449 sx.outblock.cctx = &cctx;
4450 sx.outblock.buffersize = sizeof(outbuffer);
4451 sx.outblock.buffer = outbuffer;
4452 sx.outblock.ptr = outbuffer;
4453 sx.outblock.cmd_count = 0;
4454 sx.outblock.authenticating = FALSE;
4456 (void)smtp_write_command(&sx, SCMD_FLUSH, "QUIT\r\n");
4457 (void)smtp_read_response(&sx, buffer, sizeof(buffer), '2', ob->command_timeout);
4458 (void)close(cctx.sock);
4463 /*************************************************
4464 * Prepare addresses for delivery *
4465 *************************************************/
4467 /* This function is called to flush out error settings from previous delivery
4468 attempts to other hosts. It also records whether we got here via an MX record
4469 or not in the more_errno field of the address. We are interested only in
4470 addresses that are still marked DEFER - others may have got delivered to a
4471 previously considered IP address. Set their status to PENDING_DEFER to indicate
4472 which ones are relevant this time.
4475 addrlist the list of addresses
4476 host the host we are delivering to
4478 Returns: the first address for this delivery
4481 static address_item *
4482 prepare_addresses(address_item *addrlist, host_item *host)
4484 address_item *first_addr = NULL;
4485 for (address_item * addr = addrlist; addr; addr = addr->next)
4486 if (addr->transport_return == DEFER)
4488 if (!first_addr) first_addr = addr;
4489 addr->transport_return = PENDING_DEFER;
4490 addr->basic_errno = 0;
4491 addr->more_errno = (host->mx >= 0)? 'M' : 'A';
4492 addr->message = NULL;
4494 addr->cipher = NULL;
4495 addr->ourcert = NULL;
4496 addr->peercert = NULL;
4497 addr->peerdn = NULL;
4498 addr->ocsp = OCSP_NOT_REQ;
4500 #ifdef EXPERIMENTAL_DSN_INFO
4501 addr->smtp_greeting = NULL;
4502 addr->helo_response = NULL;
4510 /*************************************************
4511 * Main entry point *
4512 *************************************************/
4514 /* See local README for interface details. As this is a remote transport, it is
4515 given a chain of addresses to be delivered in one connection, if possible. It
4516 always returns TRUE, indicating that each address has its own independent
4517 status set, except if there is a setting up problem, in which case it returns
4521 smtp_transport_entry(
4522 transport_instance *tblock, /* data for this instantiation */
4523 address_item *addrlist) /* addresses we are working on */
4526 int hosts_defer = 0;
4528 int hosts_looked_up = 0;
4529 int hosts_retry = 0;
4530 int hosts_serial = 0;
4531 int hosts_total = 0;
4532 int total_hosts_tried = 0;
4533 BOOL expired = TRUE;
4534 uschar *expanded_hosts = NULL;
4536 uschar *tid = string_sprintf("%s transport", tblock->name);
4537 smtp_transport_options_block *ob = SOB tblock->options_block;
4538 host_item *hostlist = addrlist->host_list;
4539 host_item *host = NULL;
4543 debug_printf("%s transport entered\n", tblock->name);
4544 for (address_item * addr = addrlist; addr; addr = addr->next)
4545 debug_printf(" %s\n", addr->address);
4548 debug_printf("hostlist:\n");
4549 for (host_item * host = hostlist; host; host = host->next)
4550 debug_printf(" '%s' IP %s port %d\n", host->name, host->address, host->port);
4552 if (continue_hostname)
4553 debug_printf("already connected to %s [%s] (on fd %d)\n",
4554 continue_hostname, continue_host_address,
4555 cutthrough.cctx.sock >= 0 ? cutthrough.cctx.sock : 0);
4558 /* Set the flag requesting that these hosts be added to the waiting
4559 database if the delivery fails temporarily or if we are running with
4560 queue_smtp or a 2-stage queue run. This gets unset for certain
4561 kinds of error, typically those that are specific to the message. */
4563 update_waiting = TRUE;
4565 /* If a host list is not defined for the addresses - they must all have the
4566 same one in order to be passed to a single transport - or if the transport has
4567 a host list with hosts_override set, use the host list supplied with the
4568 transport. It is an error for this not to exist. */
4570 if (!hostlist || (ob->hosts_override && ob->hosts))
4574 addrlist->message = string_sprintf("%s transport called with no hosts set",
4576 addrlist->transport_return = PANIC;
4577 return FALSE; /* Only top address has status */
4580 DEBUG(D_transport) debug_printf("using the transport's hosts: %s\n",
4583 /* If the transport's host list contains no '$' characters, and we are not
4584 randomizing, it is fixed and therefore a chain of hosts can be built once
4585 and for all, and remembered for subsequent use by other calls to this
4586 transport. If, on the other hand, the host list does contain '$', or we are
4587 randomizing its order, we have to rebuild it each time. In the fixed case,
4588 as the hosts string will never be used again, it doesn't matter that we
4589 replace all the : characters with zeros. */
4593 uschar *s = ob->hosts;
4595 if (Ustrchr(s, '$') != NULL)
4597 if (!(expanded_hosts = expand_string(s)))
4599 addrlist->message = string_sprintf("failed to expand list of hosts "
4600 "\"%s\" in %s transport: %s", s, tblock->name, expand_string_message);
4601 addrlist->transport_return = f.search_find_defer ? DEFER : PANIC;
4602 return FALSE; /* Only top address has status */
4604 DEBUG(D_transport) debug_printf("expanded list of hosts \"%s\" to "
4605 "\"%s\"\n", s, expanded_hosts);
4609 if (ob->hosts_randomize) s = expanded_hosts = string_copy(s);
4613 log_write(0, LOG_MAIN|LOG_PANIC,
4614 "attempt to use tainted host list '%s' from '%s' in transport %s",
4615 s, ob->hosts, tblock->name);
4616 /* Avoid leaking info to an attacker */
4617 addrlist->message = US"internal configuration error";
4618 addrlist->transport_return = PANIC;
4622 host_build_hostlist(&hostlist, s, ob->hosts_randomize);
4624 /* Check that the expansion yielded something useful. */
4628 string_sprintf("%s transport has empty hosts setting", tblock->name);
4629 addrlist->transport_return = PANIC;
4630 return FALSE; /* Only top address has status */
4633 /* If there was no expansion of hosts, save the host list for
4636 if (!expanded_hosts) ob->hostlist = hostlist;
4639 /* This is not the first time this transport has been run in this delivery;
4640 the host list was built previously. */
4643 hostlist = ob->hostlist;
4646 /* The host list was supplied with the address. If hosts_randomize is set, we
4647 must sort it into a random order if it did not come from MX records and has not
4648 already been randomized (but don't bother if continuing down an existing
4651 else if (ob->hosts_randomize && hostlist->mx == MX_NONE && !continue_hostname)
4653 host_item *newlist = NULL;
4656 host_item *h = hostlist;
4657 hostlist = hostlist->next;
4659 h->sort_key = random_number(100);
4666 else if (h->sort_key < newlist->sort_key)
4673 host_item *hh = newlist;
4676 if (h->sort_key < hh->next->sort_key) break;
4684 hostlist = addrlist->host_list = newlist;
4687 /* Sort out the default port. */
4689 if (!smtp_get_port(ob->port, addrlist, &defport, tid)) return FALSE;
4691 /* For each host-plus-IP-address on the list:
4693 . If this is a continued delivery and the host isn't the one with the
4694 current connection, skip.
4696 . If the status is unusable (i.e. previously failed or retry checked), skip.
4698 . If no IP address set, get the address, either by turning the name into
4699 an address, calling gethostbyname if gethostbyname is on, or by calling
4700 the DNS. The DNS may yield multiple addresses, in which case insert the
4701 extra ones into the list.
4703 . Get the retry data if not previously obtained for this address and set the
4704 field which remembers the state of this address. Skip if the retry time is
4705 not reached. If not, remember whether retry data was found. The retry string
4706 contains both the name and the IP address.
4708 . Scan the list of addresses and mark those whose status is DEFER as
4709 PENDING_DEFER. These are the only ones that will be processed in this cycle
4712 . Make a delivery attempt - addresses marked PENDING_DEFER will be tried.
4713 Some addresses may be successfully delivered, others may fail, and yet
4714 others may get temporary errors and so get marked DEFER.
4716 . The return from the delivery attempt is OK if a connection was made and a
4717 valid SMTP dialogue was completed. Otherwise it is DEFER.
4719 . If OK, add a "remove" retry item for this host/IPaddress, if any.
4721 . If fail to connect, or other defer state, add a retry item.
4723 . If there are any addresses whose status is still DEFER, carry on to the
4724 next host/IPaddress, unless we have tried the number of hosts given
4725 by hosts_max_try or hosts_max_try_hardlimit; otherwise return. Note that
4726 there is some fancy logic for hosts_max_try that means its limit can be
4727 overstepped in some circumstances.
4729 If we get to the end of the list, all hosts have deferred at least one address,
4730 or not reached their retry times. If delay_after_cutoff is unset, it requests a
4731 delivery attempt to those hosts whose last try was before the arrival time of
4732 the current message. To cope with this, we have to go round the loop a second
4733 time. After that, set the status and error data for any addresses that haven't
4734 had it set already. */
4736 for (int cutoff_retry = 0;
4737 expired && cutoff_retry < (ob->delay_after_cutoff ? 1 : 2);
4740 host_item *nexthost = NULL;
4741 int unexpired_hosts_tried = 0;
4742 BOOL continue_host_tried = FALSE;
4744 retry_non_continued:
4745 for (host = hostlist;
4747 && unexpired_hosts_tried < ob->hosts_max_try
4748 && total_hosts_tried < ob->hosts_max_try_hardlimit;
4753 BOOL host_is_expired = FALSE;
4754 BOOL message_defer = FALSE;
4755 BOOL some_deferred = FALSE;
4756 address_item *first_addr = NULL;
4757 uschar *interface = NULL;
4758 uschar *retry_host_key = NULL;
4759 uschar *retry_message_key = NULL;
4760 uschar *serialize_key = NULL;
4762 /* Default next host is next host. :-) But this can vary if the
4763 hosts_max_try limit is hit (see below). It may also be reset if a host
4764 address is looked up here (in case the host was multihomed). */
4766 nexthost = host->next;
4768 /* If the address hasn't yet been obtained from the host name, look it up
4769 now, unless the host is already marked as unusable. If it is marked as
4770 unusable, it means that the router was unable to find its IP address (in
4771 the DNS or wherever) OR we are in the 2nd time round the cutoff loop, and
4772 the lookup failed last time. We don't get this far if *all* MX records
4773 point to non-existent hosts; that is treated as a hard error.
4775 We can just skip this host entirely. When the hosts came from the router,
4776 the address will timeout based on the other host(s); when the address is
4777 looked up below, there is an explicit retry record added.
4779 Note that we mustn't skip unusable hosts if the address is not unset; they
4780 may be needed as expired hosts on the 2nd time round the cutoff loop. */
4784 int new_port, flags;
4786 if (host->status >= hstatus_unusable)
4788 DEBUG(D_transport) debug_printf("%s has no address and is unusable - skipping\n",
4793 DEBUG(D_transport) debug_printf("getting address for %s\n", host->name);
4795 /* The host name is permitted to have an attached port. Find it, and
4796 strip it from the name. Just remember it for now. */
4798 new_port = host_item_get_port(host);
4800 /* Count hosts looked up */
4804 /* Find by name if so configured, or if it's an IP address. We don't
4805 just copy the IP address, because we need the test-for-local to happen. */
4807 flags = HOST_FIND_BY_A | HOST_FIND_BY_AAAA;
4808 if (ob->dns_qualify_single) flags |= HOST_FIND_QUALIFY_SINGLE;
4809 if (ob->dns_search_parents) flags |= HOST_FIND_SEARCH_PARENTS;
4811 if (ob->gethostbyname || string_is_ip_address(host->name, NULL) != 0)
4812 rc = host_find_byname(host, NULL, flags, NULL, TRUE);
4814 rc = host_find_bydns(host, NULL, flags, NULL, NULL, NULL,
4815 &ob->dnssec, /* domains for request/require */
4818 /* Update the host (and any additional blocks, resulting from
4819 multihoming) with a host-specific port, if any. */
4821 for (host_item * hh = host; hh != nexthost; hh = hh->next) hh->port = new_port;
4823 /* Failure to find the host at this time (usually DNS temporary failure)
4824 is really a kind of routing failure rather than a transport failure.
4825 Therefore we add a retry item of the routing kind, not to stop us trying
4826 to look this name up here again, but to ensure the address gets timed
4827 out if the failures go on long enough. A complete failure at this point
4828 commonly points to a configuration error, but the best action is still
4829 to carry on for the next host. */
4831 if (rc == HOST_FIND_AGAIN || rc == HOST_FIND_SECURITY || rc == HOST_FIND_FAILED)
4833 retry_add_item(addrlist, string_sprintf("R:%s", host->name), 0);
4835 if (rc == HOST_FIND_AGAIN) hosts_defer++; else hosts_fail++;
4836 DEBUG(D_transport) debug_printf("rc = %s for %s\n", (rc == HOST_FIND_AGAIN)?
4837 "HOST_FIND_AGAIN" : "HOST_FIND_FAILED", host->name);
4838 host->status = hstatus_unusable;
4840 for (address_item * addr = addrlist; addr; addr = addr->next)
4842 if (addr->transport_return != DEFER) continue;
4843 addr->basic_errno = ERRNO_UNKNOWNHOST;
4844 addr->message = string_sprintf(
4845 rc == HOST_FIND_SECURITY
4846 ? "lookup of IP address for %s was insecure"
4847 : "failed to lookup IP address for %s",
4853 /* If the host is actually the local host, we may have a problem, or
4854 there may be some cunning configuration going on. In the problem case,
4855 log things and give up. The default transport status is already DEFER. */
4857 if (rc == HOST_FOUND_LOCAL && !ob->allow_localhost)
4859 for (address_item * addr = addrlist; addr; addr = addr->next)
4861 addr->basic_errno = 0;
4862 addr->message = string_sprintf("%s transport found host %s to be "
4863 "local", tblock->name, host->name);
4867 } /* End of block for IP address lookup */
4869 /* If this is a continued delivery, we are interested only in the host
4870 which matches the name of the existing open channel. The check is put
4871 here after the local host lookup, in case the name gets expanded as a
4872 result of the lookup. Set expired FALSE, to save the outer loop executing
4875 if (continue_hostname)
4876 if ( Ustrcmp(continue_hostname, host->name) != 0
4877 || Ustrcmp(continue_host_address, host->address) != 0
4881 continue; /* With next host */
4884 continue_host_tried = TRUE;
4886 /* Reset the default next host in case a multihomed host whose addresses
4887 are not looked up till just above added to the host list. */
4889 nexthost = host->next;
4891 /* If queue_smtp is set (-odqs or the first part of a 2-stage run), or the
4892 domain is in queue_smtp_domains, we don't actually want to attempt any
4893 deliveries. When doing a queue run, queue_smtp_domains is always unset. If
4894 there is a lookup defer in queue_smtp_domains, proceed as if the domain
4895 were not in it. We don't want to hold up all SMTP deliveries! Except when
4896 doing a two-stage queue run, don't do this if forcing. */
4898 if ((!f.deliver_force || f.queue_2stage) && (f.queue_smtp ||
4899 match_isinlist(addrlist->domain,
4900 (const uschar **)&queue_smtp_domains, 0,
4901 &domainlist_anchor, NULL, MCL_DOMAIN, TRUE, NULL) == OK))
4904 for (address_item * addr = addrlist; addr; addr = addr->next)
4905 if (addr->transport_return == DEFER)
4906 addr->message = US"domain matches queue_smtp_domains, or -odqs set";
4907 continue; /* With next host */
4910 /* Count hosts being considered - purely for an intelligent comment
4911 if none are usable. */
4915 /* Set $host and $host address now in case they are needed for the
4916 interface expansion or the serialize_hosts check; they remain set if an
4917 actual delivery happens. */
4919 deliver_host = host->name;
4920 deliver_host_address = host->address;
4921 lookup_dnssec_authenticated = host->dnssec == DS_YES ? US"yes"
4922 : host->dnssec == DS_NO ? US"no"
4925 /* Set up a string for adding to the retry key if the port number is not
4926 the standard SMTP port. A host may have its own port setting that overrides
4929 pistring = string_sprintf(":%d", host->port == PORT_NONE
4930 ? defport : host->port);
4931 if (Ustrcmp(pistring, ":25") == 0) pistring = US"";
4933 /* Select IPv4 or IPv6, and choose an outgoing interface. If the interface
4934 string is set, even if constant (as different transports can have different
4935 constant settings), we must add it to the key that is used for retries,
4936 because connections to the same host from a different interface should be
4937 treated separately. */
4939 host_af = Ustrchr(host->address, ':') == NULL ? AF_INET : AF_INET6;
4941 uschar * s = ob->interface;
4944 if (!smtp_get_interface(s, host_af, addrlist, &interface, tid))
4946 pistring = string_sprintf("%s/%s", pistring, interface);
4950 /* The first time round the outer loop, check the status of the host by
4951 inspecting the retry data. The second time round, we are interested only
4952 in expired hosts that haven't been tried since this message arrived. */
4954 if (cutoff_retry == 0)
4957 /* Ensure the status of the address is set by checking retry data if
4958 necessary. There may be host-specific retry data (applicable to all
4959 messages) and also data for retries of a specific message at this host.
4960 If either of these retry records are actually read, the keys used are
4961 returned to save recomputing them later. */
4963 if (exp_bool(addrlist, US"transport", tblock->name, D_transport,
4964 US"retry_include_ip_address", ob->retry_include_ip_address,
4965 ob->expand_retry_include_ip_address, &incl_ip) != OK)
4966 continue; /* with next host */
4968 host_is_expired = retry_check_address(addrlist->domain, host, pistring,
4969 incl_ip, &retry_host_key, &retry_message_key);
4971 DEBUG(D_transport) debug_printf("%s [%s]%s retry-status = %s\n", host->name,
4972 host->address ? host->address : US"", pistring,
4973 host->status == hstatus_usable ? "usable"
4974 : host->status == hstatus_unusable ? "unusable"
4975 : host->status == hstatus_unusable_expired ? "unusable (expired)" : "?");
4977 /* Skip this address if not usable at this time, noting if it wasn't
4978 actually expired, both locally and in the address. */
4980 switch (host->status)
4982 case hstatus_unusable:
4984 setflag(addrlist, af_retry_skipped);
4987 case hstatus_unusable_expired:
4990 case hwhy_retry: hosts_retry++; break;
4991 case hwhy_failed: hosts_fail++; break;
4993 case hwhy_deferred: hosts_defer++; break;
4996 /* If there was a retry message key, implying that previously there
4997 was a message-specific defer, we don't want to update the list of
4998 messages waiting for these hosts. */
5000 if (retry_message_key) update_waiting = FALSE;
5001 continue; /* With the next host or IP address */
5005 /* Second time round the loop: if the address is set but expired, and
5006 the message is newer than the last try, let it through. */
5011 || host->status != hstatus_unusable_expired
5012 || host->last_try > received_time.tv_sec)
5014 DEBUG(D_transport) debug_printf("trying expired host %s [%s]%s\n",
5015 host->name, host->address, pistring);
5016 host_is_expired = TRUE;
5019 /* Setting "expired=FALSE" doesn't actually mean not all hosts are expired;
5020 it remains TRUE only if all hosts are expired and none are actually tried.
5025 /* If this host is listed as one to which access must be serialized,
5026 see if another Exim process has a connection to it, and if so, skip
5027 this host. If not, update the database to record our connection to it
5028 and remember this for later deletion. Do not do any of this if we are
5029 sending the message down a pre-existing connection. */
5031 if ( !continue_hostname
5032 && verify_check_given_host(CUSS &ob->serialize_hosts, host) == OK)
5034 serialize_key = string_sprintf("host-serialize-%s", host->name);
5035 if (!enq_start(serialize_key, 1))
5038 debug_printf("skipping host %s because another Exim process "
5039 "is connected to it\n", host->name);
5045 /* OK, we have an IP address that is not waiting for its retry time to
5046 arrive (it might be expired) OR (second time round the loop) we have an
5047 expired host that hasn't been tried since the message arrived. Have a go
5048 at delivering the message to it. First prepare the addresses by flushing
5049 out the result of previous attempts, and finding the first address that
5050 is still to be delivered. */
5052 first_addr = prepare_addresses(addrlist, host);
5054 DEBUG(D_transport) debug_printf("delivering %s to %s [%s] (%s%s)\n",
5055 message_id, host->name, host->address, addrlist->address,
5056 addrlist->next ? ", ..." : "");
5058 set_process_info("delivering %s to %s [%s]%s (%s%s)",
5059 message_id, host->name, host->address, pistring, addrlist->address,
5060 addrlist->next ? ", ..." : "");
5062 /* This is not for real; don't do the delivery. If there are
5063 any remaining hosts, list them. */
5067 set_errno_nohost(addrlist, 0, NULL, OK, FALSE);
5068 for (address_item * addr = addrlist; addr; addr = addr->next)
5070 addr->host_used = host;
5071 addr->special_action = '*';
5072 addr->message = US"delivery bypassed by -N option";
5076 debug_printf("*** delivery by %s transport bypassed by -N option\n"
5077 "*** host and remaining hosts:\n", tblock->name);
5078 for (host_item * host2 = host; host2; host2 = host2->next)
5079 debug_printf(" %s [%s]\n", host2->name,
5080 host2->address ? host2->address : US"unset");
5085 /* This is for real. If the host is expired, we don't count it for
5086 hosts_max_retry. This ensures that all hosts must expire before an address
5087 is timed out, unless hosts_max_try_hardlimit (which protects against
5088 lunatic DNS configurations) is reached.
5090 If the host is not expired and we are about to hit the hosts_max_retry
5091 limit, check to see if there is a subsequent hosts with a different MX
5092 value. If so, make that the next host, and don't count this one. This is a
5093 heuristic to make sure that different MXs do get tried. With a normal kind
5094 of retry rule, they would get tried anyway when the earlier hosts were
5095 delayed, but if the domain has a "retry every time" type of rule - as is
5096 often used for the the very large ISPs, that won't happen. */
5101 /* Make a copy of the host if it is local to this invocation
5102 of the transport. */
5106 thost = store_get(sizeof(host_item), FALSE);
5108 thost->name = string_copy(host->name);
5109 thost->address = string_copy(host->address);
5114 if (!host_is_expired && ++unexpired_hosts_tried >= ob->hosts_max_try)
5117 debug_printf("hosts_max_try limit reached with this host\n");
5118 for (host_item * h = host; h; h = h->next) if (h->mx != host->mx)
5121 unexpired_hosts_tried--;
5122 DEBUG(D_transport) debug_printf("however, a higher MX host exists "
5123 "and will be tried\n");
5128 /* Attempt the delivery. */
5130 total_hosts_tried++;
5131 rc = smtp_deliver(addrlist, thost, host_af, defport, interface, tblock,
5132 &message_defer, FALSE);
5135 OK => connection made, each address contains its result;
5136 message_defer is set for message-specific defers (when all
5137 recipients are marked defer)
5138 DEFER => there was a non-message-specific delivery problem;
5139 ERROR => there was a problem setting up the arguments for a filter,
5140 or there was a problem with expanding added headers
5143 /* If the result is not OK, there was a non-message-specific problem.
5144 If the result is DEFER, we need to write to the logs saying what happened
5145 for this particular host, except in the case of authentication and TLS
5146 failures, where the log has already been written. If all hosts defer a
5147 general message is written at the end. */
5149 if (rc == DEFER && first_addr->basic_errno != ERRNO_AUTHFAIL
5150 && first_addr->basic_errno != ERRNO_TLSFAILURE)
5151 write_logs(host, first_addr->message, first_addr->basic_errno);
5153 #ifndef DISABLE_EVENT
5155 deferred_event_raise(first_addr, host);
5158 /* If STARTTLS was accepted, but there was a failure in setting up the
5159 TLS session (usually a certificate screwup), and the host is not in
5160 hosts_require_tls, and tls_tempfail_tryclear is true, try again, with
5161 TLS forcibly turned off. We have to start from scratch with a new SMTP
5162 connection. That's why the retry is done from here, not from within
5163 smtp_deliver(). [Rejections of STARTTLS itself don't screw up the
5164 session, so the in-clear transmission after those errors, if permitted,
5165 happens inside smtp_deliver().] */
5169 && first_addr->basic_errno == ERRNO_TLSFAILURE
5170 && ob->tls_tempfail_tryclear
5171 && verify_check_given_host(CUSS &ob->hosts_require_tls, host) != OK
5174 log_write(0, LOG_MAIN,
5175 "%s: delivering unencrypted to H=%s [%s] (not in hosts_require_tls)",
5176 first_addr->message, host->name, host->address);
5177 first_addr = prepare_addresses(addrlist, host);
5178 rc = smtp_deliver(addrlist, thost, host_af, defport, interface, tblock,
5179 &message_defer, TRUE);
5180 if (rc == DEFER && first_addr->basic_errno != ERRNO_AUTHFAIL)
5181 write_logs(host, first_addr->message, first_addr->basic_errno);
5182 # ifndef DISABLE_EVENT
5184 deferred_event_raise(first_addr, host);
5187 #endif /*DISABLE_TLS*/
5190 /* Delivery attempt finished */
5192 set_process_info("delivering %s: just tried %s [%s]%s for %s%s: result %s",
5193 message_id, host->name, host->address, pistring, addrlist->address,
5194 addrlist->next ? " (& others)" : "", rc_to_string(rc));
5196 /* Release serialization if set up */
5198 if (serialize_key) enq_end(serialize_key);
5200 /* If the result is DEFER, or if a host retry record is known to exist, we
5201 need to add an item to the retry chain for updating the retry database
5202 at the end of delivery. We only need to add the item to the top address,
5203 of course. Also, if DEFER, we mark the IP address unusable so as to skip it
5204 for any other delivery attempts using the same address. (It is copied into
5205 the unusable tree at the outer level, so even if different address blocks
5206 contain the same address, it still won't get tried again.) */
5208 if (rc == DEFER || retry_host_key)
5210 int delete_flag = rc != DEFER ? rf_delete : 0;
5211 if (!retry_host_key)
5214 if (exp_bool(addrlist, US"transport", tblock->name, D_transport,
5215 US"retry_include_ip_address", ob->retry_include_ip_address,
5216 ob->expand_retry_include_ip_address, &incl_ip) != OK)
5217 incl_ip = TRUE; /* error; use most-specific retry record */
5219 retry_host_key = incl_ip
5220 ? string_sprintf("T:%S:%s%s", host->name, host->address, pistring)
5221 : string_sprintf("T:%S%s", host->name, pistring);
5224 /* If a delivery of another message over an existing SMTP connection
5225 yields DEFER, we do NOT set up retry data for the host. This covers the
5226 case when there are delays in routing the addresses in the second message
5227 that are so long that the server times out. This is alleviated by not
5228 routing addresses that previously had routing defers when handling an
5229 existing connection, but even so, this case may occur (e.g. if a
5230 previously happily routed address starts giving routing defers). If the
5231 host is genuinely down, another non-continued message delivery will
5232 notice it soon enough. */
5234 if (delete_flag != 0 || !continue_hostname)
5235 retry_add_item(first_addr, retry_host_key, rf_host | delete_flag);
5237 /* We may have tried an expired host, if its retry time has come; ensure
5238 the status reflects the expiry for the benefit of any other addresses. */
5242 host->status = host_is_expired
5243 ? hstatus_unusable_expired : hstatus_unusable;
5244 host->why = hwhy_deferred;
5248 /* If message_defer is set (host was OK, but every recipient got deferred
5249 because of some message-specific problem), or if that had happened
5250 previously so that a message retry key exists, add an appropriate item
5251 to the retry chain. Note that if there was a message defer but now there is
5252 a host defer, the message defer record gets deleted. That seems perfectly
5253 reasonable. Also, stop the message from being remembered as waiting
5254 for specific hosts. */
5256 if (message_defer || retry_message_key)
5258 int delete_flag = message_defer ? 0 : rf_delete;
5259 if (!retry_message_key)
5262 if (exp_bool(addrlist, US"transport", tblock->name, D_transport,
5263 US"retry_include_ip_address", ob->retry_include_ip_address,
5264 ob->expand_retry_include_ip_address, &incl_ip) != OK)
5265 incl_ip = TRUE; /* error; use most-specific retry record */
5267 retry_message_key = incl_ip
5268 ? string_sprintf("T:%S:%s%s:%s", host->name, host->address, pistring,
5270 : string_sprintf("T:%S%s:%s", host->name, pistring, message_id);
5272 retry_add_item(addrlist, retry_message_key,
5273 rf_message | rf_host | delete_flag);
5274 update_waiting = FALSE;
5277 /* Any return other than DEFER (that is, OK or ERROR) means that the
5278 addresses have got their final statuses filled in for this host. In the OK
5279 case, see if any of them are deferred. */
5282 for (address_item * addr = addrlist; addr; addr = addr->next)
5283 if (addr->transport_return == DEFER)
5285 some_deferred = TRUE;
5289 /* If no addresses deferred or the result was ERROR, return. We do this for
5290 ERROR because a failing filter set-up or add_headers expansion is likely to
5291 fail for any host we try. */
5293 if (rc == ERROR || (rc == OK && !some_deferred))
5295 DEBUG(D_transport) debug_printf("Leaving %s transport\n", tblock->name);
5296 return TRUE; /* Each address has its status */
5299 /* If the result was DEFER or some individual addresses deferred, let
5300 the loop run to try other hosts with the deferred addresses, except for the
5301 case when we were trying to deliver down an existing channel and failed.
5302 Don't try any other hosts in this case. */
5304 if (continue_hostname) break;
5306 /* If the whole delivery, or some individual addresses, were deferred and
5307 there are more hosts that could be tried, do not count this host towards
5308 the hosts_max_try limit if the age of the message is greater than the
5309 maximum retry time for this host. This means we may try try all hosts,
5310 ignoring the limit, when messages have been around for some time. This is
5311 important because if we don't try all hosts, the address will never time
5312 out. NOTE: this does not apply to hosts_max_try_hardlimit. */
5314 if ((rc == DEFER || some_deferred) && nexthost)
5317 retry_config *retry = retry_find_config(host->name, NULL, 0, 0);
5319 if (retry && retry->rules)
5321 retry_rule *last_rule;
5322 for (last_rule = retry->rules;
5324 last_rule = last_rule->next);
5325 timedout = time(NULL) - received_time.tv_sec > last_rule->timeout;
5327 else timedout = TRUE; /* No rule => timed out */
5331 unexpired_hosts_tried--;
5332 DEBUG(D_transport) debug_printf("temporary delivery error(s) override "
5333 "hosts_max_try (message older than host's retry time)\n");
5339 if (unexpired_hosts_tried >= ob->hosts_max_try)
5340 debug_printf("reached transport hosts_max_try limit %d\n",
5342 if (total_hosts_tried >= ob->hosts_max_try_hardlimit)
5343 debug_printf("reached transport hosts_max_try_hardlimit limit %d\n",
5344 ob->hosts_max_try_hardlimit);
5347 if (f.running_in_test_harness) millisleep(500); /* let server debug out */
5348 } /* End of loop for trying multiple hosts. */
5350 /* If we failed to find a matching host in the list, for an already-open
5351 connection, just close it and start over with the list. This can happen
5352 for routing that changes from run to run, or big multi-IP sites with
5355 if (continue_hostname && !continue_host_tried)
5357 int fd = cutthrough.cctx.sock >= 0 ? cutthrough.cctx.sock : 0;
5359 DEBUG(D_transport) debug_printf("no hosts match already-open connection\n");
5361 /* A TLS conn could be open for a cutthrough, but not for a plain continued-
5363 /*XXX doublecheck that! */
5365 if (cutthrough.cctx.sock >= 0 && cutthrough.is_tls)
5367 (void) tls_write(cutthrough.cctx.tls_ctx, US"QUIT\r\n", 6, FALSE);
5368 tls_close(cutthrough.cctx.tls_ctx, TLS_SHUTDOWN_NOWAIT);
5369 cutthrough.cctx.tls_ctx = NULL;
5370 cutthrough.is_tls = FALSE;
5374 (void) write(fd, US"QUIT\r\n", 6);
5377 cutthrough.cctx.sock = -1;
5378 continue_hostname = NULL;
5379 goto retry_non_continued;
5382 /* This is the end of the loop that repeats iff expired is TRUE and
5383 ob->delay_after_cutoff is FALSE. The second time round we will
5384 try those hosts that haven't been tried since the message arrived. */
5388 debug_printf("all IP addresses skipped or deferred at least one address\n");
5389 if (expired && !ob->delay_after_cutoff && cutoff_retry == 0)
5390 debug_printf("retrying IP addresses not tried since message arrived\n");
5395 /* Get here if all IP addresses are skipped or defer at least one address. In
5396 MUA wrapper mode, this will happen only for connection or other non-message-
5397 specific failures. Force the delivery status for all addresses to FAIL. */
5401 for (address_item * addr = addrlist; addr; addr = addr->next)
5402 addr->transport_return = FAIL;
5406 /* In the normal, non-wrapper case, add a standard message to each deferred
5407 address if there hasn't been an error, that is, if it hasn't actually been
5408 tried this time. The variable "expired" will be FALSE if any deliveries were
5409 actually tried, or if there was at least one host that was not expired. That
5410 is, it is TRUE only if no deliveries were tried and all hosts were expired. If
5411 a delivery has been tried, an error code will be set, and the failing of the
5412 message is handled by the retry code later.
5414 If queue_smtp is set, or this transport was called to send a subsequent message
5415 down an existing TCP/IP connection, and something caused the host not to be
5416 found, we end up here, but can detect these cases and handle them specially. */
5418 for (address_item * addr = addrlist; addr; addr = addr->next)
5420 /* If host is not NULL, it means that we stopped processing the host list
5421 because of hosts_max_try or hosts_max_try_hardlimit. In the former case, this
5422 means we need to behave as if some hosts were skipped because their retry
5423 time had not come. Specifically, this prevents the address from timing out.
5424 However, if we have hit hosts_max_try_hardlimit, we want to behave as if all
5425 hosts were tried. */
5428 if (total_hosts_tried >= ob->hosts_max_try_hardlimit)
5431 debug_printf("hosts_max_try_hardlimit reached: behave as if all "
5432 "hosts were tried\n");
5437 debug_printf("hosts_max_try limit caused some hosts to be skipped\n");
5438 setflag(addr, af_retry_skipped);
5441 if (f.queue_smtp) /* no deliveries attempted */
5443 addr->transport_return = DEFER;
5444 addr->basic_errno = 0;
5445 addr->message = US"SMTP delivery explicitly queued";
5448 else if ( addr->transport_return == DEFER
5449 && (addr->basic_errno == ERRNO_UNKNOWNERROR || addr->basic_errno == 0)
5453 addr->basic_errno = ERRNO_HRETRY;
5454 if (continue_hostname)
5455 addr->message = US"no host found for existing SMTP connection";
5458 setflag(addr, af_pass_message); /* This is not a security risk */
5459 addr->message = string_sprintf(
5460 "all hosts%s have been failing for a long time %s",
5461 addr->domain ? string_sprintf(" for '%s'", addr->domain) : US"",
5462 ob->delay_after_cutoff
5463 ? US"(and retry time not reached)"
5464 : US"and were last tried after this message arrived");
5466 /* If we are already using fallback hosts, or there are no fallback hosts
5467 defined, convert the result to FAIL to cause a bounce. */
5469 if (addr->host_list == addr->fallback_hosts || !addr->fallback_hosts)
5470 addr->transport_return = FAIL;
5475 if (hosts_retry == hosts_total)
5476 s = "retry time not reached for any host%s";
5477 else if (hosts_fail == hosts_total)
5478 s = "all host address lookups%s failed permanently";
5479 else if (hosts_defer == hosts_total)
5480 s = "all host address lookups%s failed temporarily";
5481 else if (hosts_serial == hosts_total)
5482 s = "connection limit reached for all hosts%s";
5483 else if (hosts_fail+hosts_defer == hosts_total)
5484 s = "all host address lookups%s failed";
5486 s = "some host address lookups failed and retry time "
5487 "not reached for other hosts or connection limit reached%s";
5489 addr->message = string_sprintf(s,
5490 addr->domain ? string_sprintf(" for '%s'", addr->domain) : US"");
5495 /* Update the database which keeps information about which messages are waiting
5496 for which hosts to become available. For some message-specific errors, the
5497 update_waiting flag is turned off because we don't want follow-on deliveries in
5498 those cases. If this transport instance is explicitly limited to one message
5499 per connection then follow-on deliveries are not possible and there's no need
5500 to create/update the per-transport wait-<transport_name> database. */
5502 if (update_waiting && tblock->connection_max_messages != 1)
5503 transport_update_waiting(hostlist, tblock->name);
5507 DEBUG(D_transport) debug_printf("Leaving %s transport\n", tblock->name);
5509 return TRUE; /* Each address has its status */
5512 #endif /*!MACRO_PREDEF*/
5515 /* End of transport/smtp.c */