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 #ifndef DISABLE_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 #ifndef DISABLE_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 /******************************************************************************/
363 smtp_deliver_init(void)
365 if (!regex_PIPELINING) regex_PIPELINING =
366 regex_must_compile(US"\\n250[\\s\\-]PIPELINING(\\s|\\n|$)", FALSE, TRUE);
368 if (!regex_SIZE) regex_SIZE =
369 regex_must_compile(US"\\n250[\\s\\-]SIZE(\\s|\\n|$)", FALSE, TRUE);
371 if (!regex_AUTH) regex_AUTH =
372 regex_must_compile(AUTHS_REGEX, FALSE, TRUE);
375 if (!regex_STARTTLS) regex_STARTTLS =
376 regex_must_compile(US"\\n250[\\s\\-]STARTTLS(\\s|\\n|$)", FALSE, TRUE);
379 if (!regex_CHUNKING) regex_CHUNKING =
380 regex_must_compile(US"\\n250[\\s\\-]CHUNKING(\\s|\\n|$)", FALSE, TRUE);
383 if (!regex_PRDR) regex_PRDR =
384 regex_must_compile(US"\\n250[\\s\\-]PRDR(\\s|\\n|$)", FALSE, TRUE);
388 if (!regex_UTF8) regex_UTF8 =
389 regex_must_compile(US"\\n250[\\s\\-]SMTPUTF8(\\s|\\n|$)", FALSE, TRUE);
392 if (!regex_DSN) regex_DSN =
393 regex_must_compile(US"\\n250[\\s\\-]DSN(\\s|\\n|$)", FALSE, TRUE);
395 if (!regex_IGNOREQUOTA) regex_IGNOREQUOTA =
396 regex_must_compile(US"\\n250[\\s\\-]IGNOREQUOTA(\\s|\\n|$)", FALSE, TRUE);
398 #ifndef DISABLE_PIPE_CONNECT
399 if (!regex_EARLY_PIPE) regex_EARLY_PIPE =
400 regex_must_compile(US"\\n250[\\s\\-]" EARLY_PIPE_FEATURE_NAME "(\\s|\\n|$)", FALSE, TRUE);
405 /*************************************************
406 * Setup entry point *
407 *************************************************/
409 /* This function is called when the transport is about to be used,
410 but before running it in a sub-process. It is used for two things:
412 (1) To set the fallback host list in addresses, when delivering.
413 (2) To pass back the interface, port, protocol, and other options, for use
414 during callout verification.
417 tblock pointer to the transport instance block
418 addrlist list of addresses about to be transported
419 tf if not NULL, pointer to block in which to return options
420 uid the uid that will be set (not used)
421 gid the gid that will be set (not used)
422 errmsg place for error message (not used)
424 Returns: OK always (FAIL, DEFER not used)
428 smtp_transport_setup(transport_instance *tblock, address_item *addrlist,
429 transport_feedback *tf, uid_t uid, gid_t gid, uschar **errmsg)
431 smtp_transport_options_block *ob = SOB tblock->options_block;
433 errmsg = errmsg; /* Keep picky compilers happy */
437 /* Pass back options if required. This interface is getting very messy. */
441 tf->interface = ob->interface;
443 tf->protocol = ob->protocol;
444 tf->hosts = ob->hosts;
445 tf->hosts_override = ob->hosts_override;
446 tf->hosts_randomize = ob->hosts_randomize;
447 tf->gethostbyname = ob->gethostbyname;
448 tf->qualify_single = ob->dns_qualify_single;
449 tf->search_parents = ob->dns_search_parents;
450 tf->helo_data = ob->helo_data;
453 /* Set the fallback host list for all the addresses that don't have fallback
454 host lists, provided that the local host wasn't present in the original host
457 if (!testflag(addrlist, af_local_host_removed))
458 for (; addrlist; addrlist = addrlist->next)
459 if (!addrlist->fallback_hosts) addrlist->fallback_hosts = ob->fallback_hostlist;
466 /*************************************************
467 * Initialization entry point *
468 *************************************************/
470 /* Called for each instance, after its options have been read, to
471 enable consistency checks to be done, or anything else that needs
474 Argument: pointer to the transport instance block
479 smtp_transport_init(transport_instance *tblock)
481 smtp_transport_options_block *ob = SOB tblock->options_block;
483 /* Retry_use_local_part defaults FALSE if unset */
485 if (tblock->retry_use_local_part == TRUE_UNSET)
486 tblock->retry_use_local_part = FALSE;
488 /* Set the default port according to the protocol */
491 ob->port = strcmpic(ob->protocol, US"lmtp") == 0
493 : strcmpic(ob->protocol, US"smtps") == 0
494 ? US"smtps" : US"smtp";
496 /* Set up the setup entry point, to be called before subprocesses for this
499 tblock->setup = smtp_transport_setup;
501 /* Complain if any of the timeouts are zero. */
503 if (ob->command_timeout <= 0 || ob->data_timeout <= 0 ||
504 ob->final_timeout <= 0)
505 log_write(0, LOG_PANIC_DIE|LOG_CONFIG,
506 "command, data, or final timeout value is zero for %s transport",
509 /* If hosts_override is set and there are local hosts, set the global
510 flag that stops verify from showing router hosts. */
512 if (ob->hosts_override && ob->hosts != NULL) tblock->overrides_hosts = TRUE;
514 /* If there are any fallback hosts listed, build a chain of host items
515 for them, but do not do any lookups at this time. */
517 host_build_hostlist(&(ob->fallback_hostlist), ob->fallback_hosts, FALSE);
524 /*************************************************
525 * Set delivery info into all active addresses *
526 *************************************************/
528 /* Only addresses whose status is >= PENDING are relevant. A lesser
529 status means that an address is not currently being processed.
532 addrlist points to a chain of addresses
533 errno_value to put in each address's errno field
534 msg to put in each address's message field
535 rc to put in each address's transport_return field
536 pass_message if TRUE, set the "pass message" flag in the address
537 host if set, mark addrs as having used this host
538 smtp_greeting from peer
539 helo_response from peer
541 If errno_value has the special value ERRNO_CONNECTTIMEOUT, ETIMEDOUT is put in
542 the errno field, and RTEF_CTOUT is ORed into the more_errno field, to indicate
543 this particular type of timeout.
549 set_errno(address_item *addrlist, int errno_value, uschar *msg, int rc,
550 BOOL pass_message, host_item * host
551 #ifdef EXPERIMENTAL_DSN_INFO
552 , const uschar * smtp_greeting, const uschar * helo_response
557 if (errno_value == ERRNO_CONNECTTIMEOUT)
559 errno_value = ETIMEDOUT;
560 orvalue = RTEF_CTOUT;
562 for (address_item * addr = addrlist; addr; addr = addr->next)
563 if (addr->transport_return >= PENDING)
565 addr->basic_errno = errno_value;
566 addr->more_errno |= orvalue;
570 if (pass_message) setflag(addr, af_pass_message);
572 addr->transport_return = rc;
575 addr->host_used = host;
576 #ifdef EXPERIMENTAL_DSN_INFO
578 {uschar * s = Ustrchr(smtp_greeting, '\n'); if (s) *s = '\0';}
579 addr->smtp_greeting = smtp_greeting;
582 {uschar * s = Ustrchr(helo_response, '\n'); if (s) *s = '\0';}
583 addr->helo_response = helo_response;
590 set_errno_nohost(address_item *addrlist, int errno_value, uschar *msg, int rc,
593 set_errno(addrlist, errno_value, msg, rc, pass_message, NULL
594 #ifdef EXPERIMENTAL_DSN_INFO
601 /*************************************************
602 * Check an SMTP response *
603 *************************************************/
605 /* This function is given an errno code and the SMTP response buffer
606 to analyse, together with the host identification for generating messages. It
607 sets an appropriate message and puts the first digit of the response code into
608 the yield variable. If no response was actually read, a suitable digit is
612 host the current host, to get its name for messages
613 errno_value pointer to the errno value
614 more_errno from the top address for use with ERRNO_FILTER_FAIL
615 buffer the SMTP response buffer
616 yield where to put a one-digit SMTP response code
617 message where to put an error message
618 pass_message set TRUE if message is an SMTP response
620 Returns: TRUE if an SMTP "QUIT" command should be sent, else FALSE
624 check_response(host_item *host, int *errno_value, int more_errno,
625 uschar *buffer, int *yield, uschar **message, BOOL *pass_message)
627 uschar * pl = pipelining_active ? US"pipelined " : US"";
630 *yield = '4'; /* Default setting is to give a temporary error */
634 case ETIMEDOUT: /* Handle response timeout */
635 *message = US string_sprintf("SMTP timeout after %s%s",
637 if (transport_count > 0)
638 *message = US string_sprintf("%s (%d bytes written)", *message,
642 case ERRNO_SMTPFORMAT: /* Handle malformed SMTP response */
643 s = string_printing(buffer);
644 while (isspace(*s)) s++;
646 ? string_sprintf("Malformed SMTP reply (an empty line) "
647 "in response to %s%s", pl, smtp_command)
648 : string_sprintf("Malformed SMTP reply in response to %s%s: %s",
649 pl, smtp_command, s);
652 case ERRNO_TLSFAILURE: /* Handle bad first read; can happen with
654 *message = US"bad first read from TLS conn";
657 case ERRNO_FILTER_FAIL: /* Handle a failed filter process error;
658 can't send QUIT as we mustn't end the DATA. */
659 *message = string_sprintf("transport filter process failed (%d)%s",
661 more_errno == EX_EXECFAILED ? ": unable to execute command" : "");
664 case ERRNO_CHHEADER_FAIL: /* Handle a failed add_headers expansion;
665 can't send QUIT as we mustn't end the DATA. */
667 string_sprintf("failed to expand headers_add or headers_remove: %s",
668 expand_string_message);
671 case ERRNO_WRITEINCOMPLETE: /* failure to write a complete data block */
672 *message = US"failed to write a data block";
676 case ERRNO_UTF8_FWD: /* no advertised SMTPUTF8, for international message */
677 *message = US"utf8 support required but not offered for forwarding";
678 DEBUG(D_deliver|D_transport) debug_printf("%s\n", *message);
683 /* Handle error responses from the remote mailer. */
687 *message = string_sprintf("SMTP error from remote mail server after %s%s: "
688 "%s", pl, smtp_command, s = string_printing(buffer));
689 *pass_message = TRUE;
694 /* No data was read. If there is no errno, this must be the EOF (i.e.
695 connection closed) case, which causes deferral. An explicit connection reset
696 error has the same effect. Otherwise, put the host's identity in the message,
697 leaving the errno value to be interpreted as well. In all cases, we have to
698 assume the connection is now dead. */
700 if (*errno_value == 0 || *errno_value == ECONNRESET)
702 *errno_value = ERRNO_SMTPCLOSED;
703 *message = US string_sprintf("Remote host closed connection "
704 "in response to %s%s", pl, smtp_command);
707 *message = US string_sprintf("%s [%s]", host->name, host->address);
714 /*************************************************
715 * Write error message to logs *
716 *************************************************/
718 /* This writes to the main log and to the message log.
721 host the current host
722 detail the current message (addr_item->message)
723 basic_errno the errno (addr_item->basic_errno)
729 write_logs(const host_item *host, const uschar *suffix, int basic_errno)
731 gstring * message = LOGGING(outgoing_port)
732 ? string_fmt_append(NULL, "H=%s [%s]:%d", host->name, host->address,
733 host->port == PORT_NONE ? 25 : host->port)
734 : string_fmt_append(NULL, "H=%s [%s]", host->name, host->address);
738 message = string_fmt_append(message, ": %s", suffix);
740 message = string_fmt_append(message, ": %s", strerror(basic_errno));
743 message = string_fmt_append(message, " %s", exim_errstr(basic_errno));
745 log_write(0, LOG_MAIN, "%s", string_from_gstring(message));
746 deliver_msglog("%s %s\n", tod_stamp(tod_log), message->s);
750 msglog_line(host_item * host, uschar * message)
752 deliver_msglog("%s H=%s [%s] %s\n", tod_stamp(tod_log),
753 host->name, host->address, message);
758 #ifndef DISABLE_EVENT
759 /*************************************************
760 * Post-defer action *
761 *************************************************/
763 /* This expands an arbitrary per-transport string.
764 It might, for example, be used to write to the database log.
767 addr the address item containing error information
768 host the current host
774 deferred_event_raise(address_item *addr, host_item *host)
776 uschar * action = addr->transport->event_action;
777 const uschar * save_domain;
783 save_domain = deliver_domain;
784 save_local = deliver_localpart;
786 /*XXX would ip & port already be set up? */
787 deliver_host_address = string_copy(host->address);
788 deliver_host_port = host->port == PORT_NONE ? 25 : host->port;
789 event_defer_errno = addr->basic_errno;
791 router_name = addr->router->name;
792 transport_name = addr->transport->name;
793 deliver_domain = addr->domain;
794 deliver_localpart = addr->local_part;
796 (void) event_raise(action, US"msg:host:defer",
798 ? addr->basic_errno > 0
799 ? string_sprintf("%s: %s", addr->message, strerror(addr->basic_errno))
800 : string_copy(addr->message)
801 : addr->basic_errno > 0
802 ? string_copy(US strerror(addr->basic_errno))
805 deliver_localpart = save_local;
806 deliver_domain = save_domain;
807 router_name = transport_name = NULL;
811 /*************************************************
812 * Reap SMTP specific responses *
813 *************************************************/
815 smtp_discard_responses(smtp_context * sx, smtp_transport_options_block * ob,
818 uschar flushbuffer[4096];
822 if (!smtp_read_response(sx, flushbuffer, sizeof(flushbuffer),
823 '2', ob->command_timeout)
824 && (errno != 0 || flushbuffer[0] == 0))
831 /* Return boolean success */
834 smtp_reap_banner(smtp_context * sx)
836 BOOL good_response = smtp_read_response(sx, sx->buffer, sizeof(sx->buffer),
837 '2', (SOB sx->conn_args.ob)->command_timeout);
838 #ifdef EXPERIMENTAL_DSN_INFO
839 sx->smtp_greeting = string_copy(sx->buffer);
841 return good_response;
845 smtp_reap_ehlo(smtp_context * sx)
847 if (!smtp_read_response(sx, sx->buffer, sizeof(sx->buffer), '2',
848 (SOB sx->conn_args.ob)->command_timeout))
850 if (errno != 0 || sx->buffer[0] == 0 || sx->lmtp)
852 #ifdef EXPERIMENTAL_DSN_INFO
853 sx->helo_response = string_copy(sx->buffer);
859 #ifdef EXPERIMENTAL_DSN_INFO
860 sx->helo_response = string_copy(sx->buffer);
862 #ifndef DISABLE_EVENT
863 (void) event_raise(sx->conn_args.tblock->event_action,
864 US"smtp:ehlo", sx->buffer);
871 #ifndef DISABLE_PIPE_CONNECT
873 ehlo_cache_key(const smtp_context * sx)
875 host_item * host = sx->conn_args.host;
876 return Ustrchr(host->address, ':')
877 ? string_sprintf("[%s]:%d.EHLO", host->address,
878 host->port == PORT_NONE ? sx->port : host->port)
879 : string_sprintf("%s:%d.EHLO", host->address,
880 host->port == PORT_NONE ? sx->port : host->port);
884 write_ehlo_cache_entry(const smtp_context * sx)
886 open_db dbblock, * dbm_file;
888 if ((dbm_file = dbfn_open(US"misc", O_RDWR, &dbblock, TRUE, TRUE)))
890 uschar * ehlo_resp_key = ehlo_cache_key(sx);
891 dbdata_ehlo_resp er = { .data = sx->ehlo_resp };
893 HDEBUG(D_transport) debug_printf("writing clr %04x/%04x cry %04x/%04x\n",
894 sx->ehlo_resp.cleartext_features, sx->ehlo_resp.cleartext_auths,
895 sx->ehlo_resp.crypted_features, sx->ehlo_resp.crypted_auths);
897 dbfn_write(dbm_file, ehlo_resp_key, &er, (int)sizeof(er));
898 dbfn_close(dbm_file);
903 invalidate_ehlo_cache_entry(smtp_context * sx)
905 open_db dbblock, * dbm_file;
907 if ( sx->early_pipe_active
908 && (dbm_file = dbfn_open(US"misc", O_RDWR, &dbblock, TRUE, TRUE)))
910 uschar * ehlo_resp_key = ehlo_cache_key(sx);
911 dbfn_delete(dbm_file, ehlo_resp_key);
912 dbfn_close(dbm_file);
917 read_ehlo_cache_entry(smtp_context * sx)
922 if (!(dbm_file = dbfn_open(US"misc", O_RDONLY, &dbblock, FALSE, TRUE)))
923 { DEBUG(D_transport) debug_printf("ehlo-cache: no misc DB\n"); }
926 uschar * ehlo_resp_key = ehlo_cache_key(sx);
927 dbdata_ehlo_resp * er;
929 if (!(er = dbfn_read(dbm_file, ehlo_resp_key)))
930 { DEBUG(D_transport) debug_printf("no ehlo-resp record\n"); }
931 else if (time(NULL) - er->time_stamp > retry_data_expire)
933 DEBUG(D_transport) debug_printf("ehlo-resp record too old\n");
934 dbfn_close(dbm_file);
935 if ((dbm_file = dbfn_open(US"misc", O_RDWR, &dbblock, TRUE, TRUE)))
936 dbfn_delete(dbm_file, ehlo_resp_key);
940 sx->ehlo_resp = er->data;
941 dbfn_close(dbm_file);
942 DEBUG(D_transport) debug_printf(
943 "EHLO response bits from cache: cleartext 0x%04x crypted 0x%04x\n",
944 er->data.cleartext_features, er->data.crypted_features);
947 dbfn_close(dbm_file);
954 /* Return an auths bitmap for the set of AUTH methods offered by the server
955 which match our authenticators. */
957 static unsigned short
958 study_ehlo_auths(smtp_context * sx)
963 unsigned short authbits = 0;
965 if (!sx->esmtp) return 0;
966 if (!regex_AUTH) regex_AUTH = regex_must_compile(AUTHS_REGEX, FALSE, TRUE);
967 if (!regex_match_and_setup(regex_AUTH, sx->buffer, 0, -1)) return 0;
968 expand_nmax = -1; /* reset */
969 names = string_copyn(expand_nstring[1], expand_nlength[1]);
971 for (au = auths, authnum = 0; au; au = au->next, authnum++) if (au->client)
973 const uschar * list = names;
977 while (string_nextinlist(&list, &sep, name, sizeof(name)))
978 if (strcmpic(au->public_name, name) == 0)
979 { authbits |= BIT(authnum); break; }
983 debug_printf("server offers %s AUTH, methods '%s', bitmap 0x%04x\n",
984 tls_out.active.sock >= 0 ? "crypted" : "plaintext", names, authbits);
986 if (tls_out.active.sock >= 0)
987 sx->ehlo_resp.crypted_auths = authbits;
989 sx->ehlo_resp.cleartext_auths = authbits;
996 /* Wait for and check responses for early-pipelining.
998 Called from the lower-level smtp_read_response() function
999 used for general code that assume synchronisation, if context
1000 flags indicate outstanding early-pipelining commands. Also
1001 called fom sync_responses() which handles pipelined commands.
1004 sx smtp connection context
1005 countp number of outstanding responses, adjusted on return
1009 DEFER error on first read of TLS'd conn
1010 FAIL SMTP error in response
1013 smtp_reap_early_pipe(smtp_context * sx, int * countp)
1015 BOOL pending_BANNER = sx->pending_BANNER;
1016 BOOL pending_EHLO = sx->pending_EHLO;
1019 sx->pending_BANNER = FALSE; /* clear early to avoid recursion */
1020 sx->pending_EHLO = FALSE;
1024 DEBUG(D_transport) debug_printf("%s expect banner\n", __FUNCTION__);
1026 if (!smtp_reap_banner(sx))
1028 DEBUG(D_transport) debug_printf("bad banner\n");
1029 if (tls_out.active.sock >= 0) rc = DEFER;
1036 unsigned peer_offered;
1037 unsigned short authbits = 0, * ap;
1039 DEBUG(D_transport) debug_printf("%s expect ehlo\n", __FUNCTION__);
1041 if (!smtp_reap_ehlo(sx))
1043 DEBUG(D_transport) debug_printf("bad response for EHLO\n");
1044 if (tls_out.active.sock >= 0) rc = DEFER;
1048 /* Compare the actual EHLO response to the cached value we assumed;
1049 on difference, dump or rewrite the cache and arrange for a retry. */
1051 ap = tls_out.active.sock < 0
1052 ? &sx->ehlo_resp.cleartext_auths : &sx->ehlo_resp.crypted_auths;
1054 peer_offered = ehlo_response(sx->buffer,
1055 (tls_out.active.sock < 0 ? OPTION_TLS : 0)
1056 | OPTION_CHUNKING | OPTION_PRDR | OPTION_DSN | OPTION_PIPE | OPTION_SIZE
1057 | OPTION_UTF8 | OPTION_EARLY_PIPE
1059 if ( peer_offered != sx->peer_offered
1060 || (authbits = study_ehlo_auths(sx)) != *ap)
1063 debug_printf("EHLO %s extensions changed, 0x%04x/0x%04x -> 0x%04x/0x%04x\n",
1064 tls_out.active.sock < 0 ? "cleartext" : "crypted",
1065 sx->peer_offered, *ap, peer_offered, authbits);
1066 *(tls_out.active.sock < 0
1067 ? &sx->ehlo_resp.cleartext_features : &sx->ehlo_resp.crypted_features) = peer_offered;
1069 if (peer_offered & OPTION_EARLY_PIPE)
1070 write_ehlo_cache_entry(sx);
1072 invalidate_ehlo_cache_entry(sx);
1074 return OK; /* just carry on */
1080 invalidate_ehlo_cache_entry(sx);
1081 (void) smtp_discard_responses(sx, sx->conn_args.ob, *countp);
1087 /*************************************************
1088 * Synchronize SMTP responses *
1089 *************************************************/
1091 /* This function is called from smtp_deliver() to receive SMTP responses from
1092 the server, and match them up with the commands to which they relate. When
1093 PIPELINING is not in use, this function is called after every command, and is
1094 therefore somewhat over-engineered, but it is simpler to use a single scheme
1095 that works both with and without PIPELINING instead of having two separate sets
1098 The set of commands that are buffered up with pipelining may start with MAIL
1099 and may end with DATA; in between are RCPT commands that correspond to the
1100 addresses whose status is PENDING_DEFER. All other commands (STARTTLS, AUTH,
1101 etc.) are never buffered.
1103 Errors after MAIL or DATA abort the whole process leaving the response in the
1104 buffer. After MAIL, pending responses are flushed, and the original command is
1105 re-instated in big_buffer for error messages. For RCPT commands, the remote is
1106 permitted to reject some recipient addresses while accepting others. However
1107 certain errors clearly abort the whole process. Set the value in
1108 transport_return to PENDING_OK if the address is accepted. If there is a
1109 subsequent general error, it will get reset accordingly. If not, it will get
1110 converted to OK at the end.
1113 sx smtp connection context
1114 count the number of responses to read
1115 pending_DATA 0 if last command sent was not DATA
1116 +1 if previously had a good recipient
1117 -1 if not previously had a good recipient
1119 Returns: 3 if at least one address had 2xx and one had 5xx
1120 2 if at least one address had 5xx but none had 2xx
1121 1 if at least one host had a 2xx response, but none had 5xx
1122 0 no address had 2xx or 5xx but no errors (all 4xx, or just DATA)
1123 -1 timeout while reading RCPT response
1124 -2 I/O or other non-response error for RCPT
1125 -3 DATA or MAIL failed - errno and buffer set
1126 -4 banner or EHLO failed (early-pipelining)
1127 -5 banner or EHLO failed (early-pipelining, TLS)
1131 sync_responses(smtp_context * sx, int count, int pending_DATA)
1133 address_item * addr = sx->sync_addr;
1134 smtp_transport_options_block * ob = sx->conn_args.ob;
1137 #ifndef DISABLE_PIPE_CONNECT
1139 if ((rc = smtp_reap_early_pipe(sx, &count)) != OK)
1140 return rc == FAIL ? -4 : -5;
1143 /* Handle the response for a MAIL command. On error, reinstate the original
1144 command in big_buffer for error message use, and flush any further pending
1145 responses before returning, except after I/O errors and timeouts. */
1147 if (sx->pending_MAIL)
1149 DEBUG(D_transport) debug_printf("%s expect mail\n", __FUNCTION__);
1151 if (!smtp_read_response(sx, sx->buffer, sizeof(sx->buffer),
1152 '2', ob->command_timeout))
1154 DEBUG(D_transport) debug_printf("bad response for MAIL\n");
1155 Ustrcpy(big_buffer, mail_command); /* Fits, because it came from there! */
1156 if (errno == ERRNO_TLSFAILURE)
1158 if (errno == 0 && sx->buffer[0] != 0)
1161 if (sx->buffer[0] == '4')
1163 save_errno = ERRNO_MAIL4XX;
1164 addr->more_errno |= ((sx->buffer[1] - '0')*10 + sx->buffer[2] - '0') << 8;
1166 count = smtp_discard_responses(sx, ob, count);
1170 if (pending_DATA) count--; /* Number of RCPT responses to come */
1171 while (count-- > 0) /* Mark any pending addrs with the host used */
1173 while (addr->transport_return != PENDING_DEFER) addr = addr->next;
1174 addr->host_used = sx->conn_args.host;
1181 if (pending_DATA) count--; /* Number of RCPT responses to come */
1183 /* Read and handle the required number of RCPT responses, matching each one up
1184 with an address by scanning for the next address whose status is PENDING_DEFER.
1189 while (addr->transport_return != PENDING_DEFER)
1190 if (!(addr = addr->next))
1193 /* The address was accepted */
1194 addr->host_used = sx->conn_args.host;
1196 DEBUG(D_transport) debug_printf("%s expect rcpt\n", __FUNCTION__);
1197 if (smtp_read_response(sx, sx->buffer, sizeof(sx->buffer),
1198 '2', ob->command_timeout))
1201 addr->transport_return = PENDING_OK;
1203 /* If af_dr_retry_exists is set, there was a routing delay on this address;
1204 ensure that any address-specific retry record is expunged. We do this both
1205 for the basic key and for the version that also includes the sender. */
1207 if (testflag(addr, af_dr_retry_exists))
1209 uschar *altkey = string_sprintf("%s:<%s>", addr->address_retry_key,
1211 retry_add_item(addr, altkey, rf_delete);
1212 retry_add_item(addr, addr->address_retry_key, rf_delete);
1216 /* Error on first TLS read */
1218 else if (errno == ERRNO_TLSFAILURE)
1221 /* Timeout while reading the response */
1223 else if (errno == ETIMEDOUT)
1225 uschar *message = string_sprintf("SMTP timeout after RCPT TO:<%s>",
1226 transport_rcpt_address(addr, sx->conn_args.tblock->rcpt_include_affixes));
1227 set_errno_nohost(sx->first_addr, ETIMEDOUT, message, DEFER, FALSE);
1228 retry_add_item(addr, addr->address_retry_key, 0);
1229 update_waiting = FALSE;
1233 /* Handle other errors in obtaining an SMTP response by returning -1. This
1234 will cause all the addresses to be deferred. Restore the SMTP command in
1235 big_buffer for which we are checking the response, so the error message
1238 else if (errno != 0 || sx->buffer[0] == 0)
1240 gstring gs = { .size = big_buffer_size, .ptr = 0, .s = big_buffer }, * g = &gs;
1242 /* Use taint-unchecked routines for writing into big_buffer, trusting
1243 that we'll never expand it. */
1245 g = string_fmt_append_f(g, SVFMT_TAINT_NOCHK, "RCPT TO:<%s>",
1246 transport_rcpt_address(addr, sx->conn_args.tblock->rcpt_include_affixes));
1247 string_from_gstring(g);
1251 /* Handle SMTP permanent and temporary response codes. */
1256 string_sprintf("SMTP error from remote mail server after RCPT TO:<%s>: "
1257 "%s", transport_rcpt_address(addr, sx->conn_args.tblock->rcpt_include_affixes),
1258 string_printing(sx->buffer));
1259 setflag(addr, af_pass_message);
1261 msglog_line(sx->conn_args.host, addr->message);
1263 /* The response was 5xx */
1265 if (sx->buffer[0] == '5')
1267 addr->transport_return = FAIL;
1271 /* The response was 4xx */
1275 addr->transport_return = DEFER;
1276 addr->basic_errno = ERRNO_RCPT4XX;
1277 addr->more_errno |= ((sx->buffer[1] - '0')*10 + sx->buffer[2] - '0') << 8;
1281 #ifndef DISABLE_EVENT
1282 event_defer_errno = addr->more_errno;
1283 msg_event_raise(US"msg:rcpt:host:defer", addr);
1286 /* Log temporary errors if there are more hosts to be tried.
1287 If not, log this last one in the == line. */
1289 if (sx->conn_args.host->next)
1290 if (LOGGING(outgoing_port))
1291 log_write(0, LOG_MAIN, "H=%s [%s]:%d %s", sx->conn_args.host->name,
1292 sx->conn_args.host->address,
1293 sx->port == PORT_NONE ? 25 : sx->port, addr->message);
1295 log_write(0, LOG_MAIN, "H=%s [%s]: %s", sx->conn_args.host->name,
1296 sx->conn_args.host->address, addr->message);
1298 #ifndef DISABLE_EVENT
1300 msg_event_raise(US"msg:rcpt:defer", addr);
1303 /* Do not put this message on the list of those waiting for specific
1304 hosts, as otherwise it is likely to be tried too often. */
1306 update_waiting = FALSE;
1308 /* Add a retry item for the address so that it doesn't get tried again
1309 too soon. If address_retry_include_sender is true, add the sender address
1310 to the retry key. */
1312 retry_add_item(addr,
1313 ob->address_retry_include_sender
1314 ? string_sprintf("%s:<%s>", addr->address_retry_key, sender_address)
1315 : addr->address_retry_key,
1320 } /* Loop for next RCPT response */
1322 /* Update where to start at for the next block of responses, unless we
1323 have already handled all the addresses. */
1325 if (addr) sx->sync_addr = addr->next;
1327 /* Handle a response to DATA. If we have not had any good recipients, either
1328 previously or in this block, the response is ignored. */
1330 if (pending_DATA != 0)
1332 DEBUG(D_transport) debug_printf("%s expect data\n", __FUNCTION__);
1333 if (!smtp_read_response(sx, sx->buffer, sizeof(sx->buffer),
1334 '3', ob->command_timeout))
1340 if (errno == ERRNO_TLSFAILURE) /* Error on first TLS read */
1343 if (pending_DATA > 0 || (yield & 1) != 0)
1345 if (errno == 0 && sx->buffer[0] == '4')
1347 errno = ERRNO_DATA4XX;
1348 sx->first_addr->more_errno |= ((sx->buffer[1] - '0')*10 + sx->buffer[2] - '0') << 8;
1352 (void)check_response(sx->conn_args.host, &errno, 0, sx->buffer, &code, &msg, &pass_message);
1353 DEBUG(D_transport) debug_printf("%s\nerror for DATA ignored: pipelining "
1354 "is in use and there were no good recipients\n", msg);
1358 /* All responses read and handled; MAIL (if present) received 2xx and DATA (if
1359 present) received 3xx. If any RCPTs were handled and yielded anything other
1360 than 4xx, yield will be set non-zero. */
1369 /* Try an authenticator's client entry */
1372 try_authenticator(smtp_context * sx, auth_instance * au)
1374 smtp_transport_options_block * ob = sx->conn_args.ob; /* transport options */
1375 host_item * host = sx->conn_args.host; /* host to deliver to */
1378 sx->outblock.authenticating = TRUE;
1379 rc = (au->info->clientcode)(au, sx, ob->command_timeout,
1380 sx->buffer, sizeof(sx->buffer));
1381 sx->outblock.authenticating = FALSE;
1382 DEBUG(D_transport) debug_printf("%s authenticator yielded %d\n", au->name, rc);
1384 /* A temporary authentication failure must hold up delivery to
1385 this host. After a permanent authentication failure, we carry on
1386 to try other authentication methods. If all fail hard, try to
1387 deliver the message unauthenticated unless require_auth was set. */
1392 f.smtp_authenticated = TRUE; /* stops the outer loop */
1393 client_authenticator = au->name;
1394 if (au->set_client_id)
1395 client_authenticated_id = expand_string(au->set_client_id);
1398 /* Failure after writing a command */
1403 /* Failure after reading a response */
1406 if (errno != 0 || sx->buffer[0] != '5') return FAIL;
1407 log_write(0, LOG_MAIN, "%s authenticator failed H=%s [%s] %s",
1408 au->name, host->name, host->address, sx->buffer);
1411 /* Failure by some other means. In effect, the authenticator
1412 decided it wasn't prepared to handle this case. Typically this
1413 is the result of "fail" in an expansion string. Do we need to
1414 log anything here? Feb 2006: a message is now put in the buffer
1415 if logging is required. */
1418 if (*sx->buffer != 0)
1419 log_write(0, LOG_MAIN, "%s authenticator cancelled "
1420 "authentication H=%s [%s] %s", au->name, host->name,
1421 host->address, sx->buffer);
1424 /* Internal problem, message in buffer. */
1427 set_errno_nohost(sx->addrlist, ERRNO_AUTHPROB, string_copy(sx->buffer),
1437 /* Do the client side of smtp-level authentication.
1440 sx smtp connection context
1442 sx->buffer should have the EHLO response from server (gets overwritten)
1445 OK Success, or failed (but not required): global "smtp_authenticated" set
1446 DEFER Failed authentication (and was required)
1447 ERROR Internal problem
1449 FAIL_SEND Failed communications - transmit
1454 smtp_auth(smtp_context * sx)
1456 host_item * host = sx->conn_args.host; /* host to deliver to */
1457 smtp_transport_options_block * ob = sx->conn_args.ob; /* transport options */
1458 int require_auth = verify_check_given_host(CUSS &ob->hosts_require_auth, host);
1459 #ifndef DISABLE_PIPE_CONNECT
1460 unsigned short authbits = tls_out.active.sock >= 0
1461 ? sx->ehlo_resp.crypted_auths : sx->ehlo_resp.cleartext_auths;
1463 uschar * fail_reason = US"server did not advertise AUTH support";
1465 f.smtp_authenticated = FALSE;
1466 client_authenticator = client_authenticated_id = client_authenticated_sender = NULL;
1469 regex_AUTH = regex_must_compile(AUTHS_REGEX, FALSE, TRUE);
1471 /* Is the server offering AUTH? */
1475 #ifndef DISABLE_PIPE_CONNECT
1476 sx->early_pipe_active ? authbits
1479 regex_match_and_setup(regex_AUTH, sx->buffer, 0, -1)
1482 uschar * names = NULL;
1483 expand_nmax = -1; /* reset */
1485 #ifndef DISABLE_PIPE_CONNECT
1486 if (!sx->early_pipe_active)
1488 names = string_copyn(expand_nstring[1], expand_nlength[1]);
1490 /* Must not do this check until after we have saved the result of the
1491 regex match above as the check could be another RE. */
1493 if ( require_auth == OK
1494 || verify_check_given_host(CUSS &ob->hosts_try_auth, host) == OK)
1496 DEBUG(D_transport) debug_printf("scanning authentication mechanisms\n");
1497 fail_reason = US"no common mechanisms were found";
1499 #ifndef DISABLE_PIPE_CONNECT
1500 if (sx->early_pipe_active)
1502 /* Scan our authenticators (which support use by a client and were offered
1503 by the server (checked at cache-write time)), not suppressed by
1504 client_condition. If one is found, attempt to authenticate by calling its
1505 client function. We are limited to supporting up to 16 authenticator
1506 public-names by the number of bits in a short. */
1512 for (bitnum = 0, au = auths;
1513 !f.smtp_authenticated && au && bitnum < 16;
1514 bitnum++, au = au->next) if (authbits & BIT(bitnum))
1516 if ( au->client_condition
1517 && !expand_check_condition(au->client_condition, au->name,
1518 US"client authenticator"))
1520 DEBUG(D_transport) debug_printf("skipping %s authenticator: %s\n",
1521 au->name, "client_condition is false");
1525 /* Found data for a listed mechanism. Call its client entry. Set
1526 a flag in the outblock so that data is overwritten after sending so
1527 that reflections don't show it. */
1529 fail_reason = US"authentication attempt(s) failed";
1531 if ((rc = try_authenticator(sx, au)) != OK)
1538 /* Scan the configured authenticators looking for one which is configured
1539 for use as a client, which is not suppressed by client_condition, and
1540 whose name matches an authentication mechanism supported by the server.
1541 If one is found, attempt to authenticate by calling its client function.
1544 for (auth_instance * au = auths; !f.smtp_authenticated && au; au = au->next)
1549 || ( au->client_condition
1550 && !expand_check_condition(au->client_condition, au->name,
1551 US"client authenticator")))
1553 DEBUG(D_transport) debug_printf("skipping %s authenticator: %s\n",
1555 (au->client)? "client_condition is false" :
1556 "not configured as a client");
1560 /* Loop to scan supported server mechanisms */
1564 int len = Ustrlen(au->public_name);
1567 while (isspace(*p)) p++;
1569 if (strncmpic(au->public_name, p, len) != 0 ||
1570 (p[len] != 0 && !isspace(p[len])))
1572 while (*p != 0 && !isspace(*p)) p++;
1576 /* Found data for a listed mechanism. Call its client entry. Set
1577 a flag in the outblock so that data is overwritten after sending so
1578 that reflections don't show it. */
1580 fail_reason = US"authentication attempt(s) failed";
1582 if ((rc = try_authenticator(sx, au)) != OK)
1585 break; /* If not authenticated, try next authenticator */
1586 } /* Loop for scanning supported server mechanisms */
1587 } /* Loop for further authenticators */
1591 /* If we haven't authenticated, but are required to, give up. */
1593 if (require_auth == OK && !f.smtp_authenticated)
1595 set_errno_nohost(sx->addrlist, ERRNO_AUTHFAIL,
1596 string_sprintf("authentication required but %s", fail_reason), DEFER,
1605 /* Construct AUTH appendix string for MAIL TO */
1608 buffer to build string
1609 addrlist chain of potential addresses to deliver
1610 ob transport options
1612 Globals f.smtp_authenticated
1613 client_authenticated_sender
1614 Return True on error, otherwise buffer has (possibly empty) terminated string
1618 smtp_mail_auth_str(uschar *buffer, unsigned bufsize, address_item *addrlist,
1619 smtp_transport_options_block *ob)
1621 uschar * local_authenticated_sender = authenticated_sender;
1624 debug_printf("smtp_mail_auth_str: as<%s> os<%s> SA<%s>\n", authenticated_sender, ob->authenticated_sender, f.smtp_authenticated?"Y":"N");
1627 if (ob->authenticated_sender)
1629 uschar *new = expand_string(ob->authenticated_sender);
1632 if (!f.expand_string_forcedfail)
1634 uschar *message = string_sprintf("failed to expand "
1635 "authenticated_sender: %s", expand_string_message);
1636 set_errno_nohost(addrlist, ERRNO_EXPANDFAIL, message, DEFER, FALSE);
1640 else if (*new) local_authenticated_sender = new;
1643 /* Add the authenticated sender address if present */
1645 if ( (f.smtp_authenticated || ob->authenticated_sender_force)
1646 && local_authenticated_sender)
1648 string_format_nt(buffer, bufsize, " AUTH=%s",
1649 auth_xtextencode(local_authenticated_sender,
1650 Ustrlen(local_authenticated_sender)));
1651 client_authenticated_sender = string_copy(local_authenticated_sender);
1662 /* Lookup TLSA record for host/port.
1663 Return: OK success with dnssec; DANE mode
1664 DEFER Do not use this host now, may retry later
1665 FAIL_FORCED No TLSA record; DANE not usable
1666 FAIL Do not use this connection
1670 tlsa_lookup(const host_item * host, dns_answer * dnsa, BOOL dane_required)
1672 /* move this out to host.c given the similarity to dns_lookup() ? */
1674 const uschar * fullname = buffer;
1678 /* TLSA lookup string */
1679 (void)sprintf(CS buffer, "_%d._tcp.%.256s", host->port, host->name);
1681 rc = dns_lookup(dnsa, buffer, T_TLSA, &fullname);
1682 sec = dns_is_secure(dnsa);
1684 debug_printf("TLSA lookup ret %d %sDNSSEC\n", rc, sec ? "" : "not ");
1689 return DEFER; /* just defer this TLS'd conn */
1697 for (dns_record * rr = dns_next_rr(dnsa, &dnss, RESET_ANSWERS); rr;
1698 rr = dns_next_rr(dnsa, &dnss, RESET_NEXT))
1699 if (rr->type == T_TLSA && rr->size > 3)
1701 uint16_t payload_length = rr->size - 3;
1702 uschar s[MAX_TLSA_EXPANDED_SIZE], * sp = s, * p = US rr->data;
1704 sp += sprintf(CS sp, "%d ", *p++); /* usage */
1705 sp += sprintf(CS sp, "%d ", *p++); /* selector */
1706 sp += sprintf(CS sp, "%d ", *p++); /* matchtype */
1707 while (payload_length-- > 0 && sp-s < (MAX_TLSA_EXPANDED_SIZE - 4))
1708 sp += sprintf(CS sp, "%02x", *p++);
1710 debug_printf(" %s\n", s);
1715 log_write(0, LOG_MAIN,
1716 "DANE error: TLSA lookup for %s not DNSSEC", host->name);
1719 case DNS_NODATA: /* no TLSA RR for this lookup */
1720 case DNS_NOMATCH: /* no records at all for this lookup */
1721 return dane_required ? FAIL : FAIL_FORCED;
1725 return dane_required ? FAIL : DEFER;
1732 typedef struct smtp_compare_s
1734 uschar *current_sender_address;
1735 struct transport_instance *tblock;
1739 /* Create a unique string that identifies this message, it is based on
1740 sender_address, helo_data and tls_certificate if enabled.
1744 smtp_local_identity(uschar * sender, struct transport_instance * tblock)
1746 address_item * addr1;
1747 uschar * if1 = US"";
1748 uschar * helo1 = US"";
1750 uschar * tlsc1 = US"";
1752 uschar * save_sender_address = sender_address;
1753 uschar * local_identity = NULL;
1754 smtp_transport_options_block * ob = SOB tblock->options_block;
1756 sender_address = sender;
1758 addr1 = deliver_make_addr (sender, TRUE);
1759 deliver_set_expansions(addr1);
1762 if1 = expand_string(ob->interface);
1765 helo1 = expand_string(ob->helo_data);
1768 if (ob->tls_certificate)
1769 tlsc1 = expand_string(ob->tls_certificate);
1770 local_identity = string_sprintf ("%s^%s^%s", if1, helo1, tlsc1);
1772 local_identity = string_sprintf ("%s^%s", if1, helo1);
1775 deliver_set_expansions(NULL);
1776 sender_address = save_sender_address;
1778 return local_identity;
1783 /* This routine is a callback that is called from transport_check_waiting.
1784 This function will evaluate the incoming message versus the previous
1785 message. If the incoming message is using a different local identity then
1786 we will veto this new message. */
1789 smtp_are_same_identities(uschar * message_id, smtp_compare_t * s_compare)
1791 uschar * message_local_identity,
1792 * current_local_identity,
1793 * new_sender_address;
1795 current_local_identity =
1796 smtp_local_identity(s_compare->current_sender_address, s_compare->tblock);
1798 if (!(new_sender_address = deliver_get_sender_address(message_id)))
1801 message_local_identity =
1802 smtp_local_identity(new_sender_address, s_compare->tblock);
1804 return Ustrcmp(current_local_identity, message_local_identity) == 0;
1810 ehlo_response(uschar * buf, unsigned checks)
1812 size_t bsize = Ustrlen(buf);
1814 /* debug_printf("%s: check for 0x%04x\n", __FUNCTION__, checks); */
1817 if ( checks & OPTION_TLS
1818 && pcre_exec(regex_STARTTLS, NULL, CS buf, bsize, 0, PCRE_EOPT, NULL, 0) < 0)
1820 checks &= ~OPTION_TLS;
1822 if ( checks & OPTION_IGNQ
1823 && pcre_exec(regex_IGNOREQUOTA, NULL, CS buf, bsize, 0,
1824 PCRE_EOPT, NULL, 0) < 0)
1825 checks &= ~OPTION_IGNQ;
1827 if ( checks & OPTION_CHUNKING
1828 && pcre_exec(regex_CHUNKING, NULL, CS buf, bsize, 0, PCRE_EOPT, NULL, 0) < 0)
1829 checks &= ~OPTION_CHUNKING;
1831 #ifndef DISABLE_PRDR
1832 if ( checks & OPTION_PRDR
1833 && pcre_exec(regex_PRDR, NULL, CS buf, bsize, 0, PCRE_EOPT, NULL, 0) < 0)
1835 checks &= ~OPTION_PRDR;
1838 if ( checks & OPTION_UTF8
1839 && pcre_exec(regex_UTF8, NULL, CS buf, bsize, 0, PCRE_EOPT, NULL, 0) < 0)
1841 checks &= ~OPTION_UTF8;
1843 if ( checks & OPTION_DSN
1844 && pcre_exec(regex_DSN, NULL, CS buf, bsize, 0, PCRE_EOPT, NULL, 0) < 0)
1845 checks &= ~OPTION_DSN;
1847 if ( checks & OPTION_PIPE
1848 && pcre_exec(regex_PIPELINING, NULL, CS buf, bsize, 0,
1849 PCRE_EOPT, NULL, 0) < 0)
1850 checks &= ~OPTION_PIPE;
1852 if ( checks & OPTION_SIZE
1853 && pcre_exec(regex_SIZE, NULL, CS buf, bsize, 0, PCRE_EOPT, NULL, 0) < 0)
1854 checks &= ~OPTION_SIZE;
1856 #ifndef DISABLE_PIPE_CONNECT
1857 if ( checks & OPTION_EARLY_PIPE
1858 && pcre_exec(regex_EARLY_PIPE, NULL, CS buf, bsize, 0,
1859 PCRE_EOPT, NULL, 0) < 0)
1861 checks &= ~OPTION_EARLY_PIPE;
1863 /* debug_printf("%s: found 0x%04x\n", __FUNCTION__, checks); */
1869 /* Callback for emitting a BDAT data chunk header.
1871 If given a nonzero size, first flush any buffered SMTP commands
1872 then emit the command.
1874 Reap previous SMTP command responses if requested, and always reap
1875 the response from a previous BDAT command.
1878 tctx transport context
1879 chunk_size value for SMTP BDAT command
1881 tc_chunk_last add LAST option to SMTP BDAT command
1882 tc_reap_prev reap response to previous SMTP commands
1886 DEFER TLS error on first read (EHLO-resp); errno set
1890 smtp_chunk_cmd_callback(transport_ctx * tctx, unsigned chunk_size,
1893 smtp_transport_options_block * ob = SOB tctx->tblock->options_block;
1894 smtp_context * sx = tctx->smtp_context;
1898 /* Write SMTP chunk header command. If not reaping responses, note that
1899 there may be more writes (like, the chunk data) done soon. */
1903 #ifndef DISABLE_PIPE_CONNECT
1904 BOOL new_conn = !!(sx->outblock.conn_args);
1906 if((cmd_count = smtp_write_command(sx,
1907 flags & tc_reap_prev ? SCMD_FLUSH : SCMD_MORE,
1908 "BDAT %u%s\r\n", chunk_size, flags & tc_chunk_last ? " LAST" : "")
1909 ) < 0) return ERROR;
1910 if (flags & tc_chunk_last)
1911 data_command = string_copy(big_buffer); /* Save for later error message */
1912 #ifndef DISABLE_PIPE_CONNECT
1913 /* That command write could have been the one that made the connection.
1914 Copy the fd from the client conn ctx (smtp transport specific) to the
1915 generic transport ctx. */
1918 tctx->u.fd = sx->outblock.cctx->sock;
1922 prev_cmd_count = cmd_count += sx->cmd_count;
1924 /* Reap responses for any previous, but not one we just emitted */
1928 if (sx->pending_BDAT)
1931 if (flags & tc_reap_prev && prev_cmd_count > 0)
1933 DEBUG(D_transport) debug_printf("look for %d responses"
1934 " for previous pipelined cmds\n", prev_cmd_count);
1936 switch(sync_responses(sx, prev_cmd_count, 0))
1938 case 1: /* 2xx (only) => OK */
1939 case 3: sx->good_RCPT = TRUE; /* 2xx & 5xx => OK & progress made */
1940 case 2: sx->completed_addr = TRUE; /* 5xx (only) => progress made */
1941 case 0: break; /* No 2xx or 5xx, but no probs */
1943 case -5: errno = ERRNO_TLSFAILURE;
1945 #ifndef DISABLE_PIPE_CONNECT
1946 case -4: /* non-2xx for pipelined banner or EHLO */
1948 case -1: /* Timeout on RCPT */
1949 default: return ERROR; /* I/O error, or any MAIL/DATA error */
1952 if (!sx->pending_BDAT)
1953 pipelining_active = FALSE;
1956 /* Reap response for an outstanding BDAT */
1958 if (sx->pending_BDAT)
1960 DEBUG(D_transport) debug_printf("look for one response for BDAT\n");
1962 if (!smtp_read_response(sx, sx->buffer, sizeof(sx->buffer), '2',
1963 ob->command_timeout))
1965 if (errno == 0 && sx->buffer[0] == '4')
1967 errno = ERRNO_DATA4XX; /*XXX does this actually get used? */
1968 sx->addrlist->more_errno |=
1969 ((sx->buffer[1] - '0')*10 + sx->buffer[2] - '0') << 8;
1974 sx->pending_BDAT = FALSE;
1975 pipelining_active = FALSE;
1977 else if (chunk_size > 0)
1978 sx->pending_BDAT = TRUE;
1981 sx->cmd_count = cmd_count;
1989 /*************************************************
1990 * Make connection for given message *
1991 *************************************************/
1995 ctx connection context
1996 suppress_tls if TRUE, don't attempt a TLS connection - this is set for
1997 a second attempt after TLS initialization fails
1999 Returns: OK - the connection was made and the delivery attempted;
2000 fd is set in the conn context, tls_out set up.
2001 DEFER - the connection could not be made, or something failed
2002 while setting up the SMTP session, or there was a
2003 non-message-specific error, such as a timeout.
2004 ERROR - helo_data or add_headers or authenticated_sender is
2005 specified for this transport, and the string failed
2009 smtp_setup_conn(smtp_context * sx, BOOL suppress_tls)
2011 smtp_transport_options_block * ob = sx->conn_args.tblock->options_block;
2012 BOOL pass_message = FALSE;
2013 uschar * message = NULL;
2016 uschar * tls_errstr;
2019 sx->conn_args.ob = ob;
2021 sx->lmtp = strcmpic(ob->protocol, US"lmtp") == 0;
2022 sx->smtps = strcmpic(ob->protocol, US"smtps") == 0;
2024 sx->send_rset = TRUE;
2025 sx->send_quit = TRUE;
2026 sx->setting_up = TRUE;
2028 sx->esmtp_sent = FALSE;
2030 sx->utf8_needed = FALSE;
2032 sx->dsn_all_lasthop = TRUE;
2034 sx->conn_args.dane = FALSE;
2036 verify_check_given_host(CUSS &ob->hosts_require_dane, sx->conn_args.host) == OK;
2038 #ifndef DISABLE_PIPE_CONNECT
2039 sx->early_pipe_active = sx->early_pipe_ok = FALSE;
2040 sx->ehlo_resp.cleartext_features = sx->ehlo_resp.crypted_features = 0;
2041 sx->pending_BANNER = sx->pending_EHLO = FALSE;
2044 if ((sx->max_rcpt = sx->conn_args.tblock->max_addresses) == 0) sx->max_rcpt = 999999;
2045 sx->peer_offered = 0;
2046 sx->avoid_option = 0;
2047 sx->igquotstr = US"";
2048 if (!sx->helo_data) sx->helo_data = ob->helo_data;
2049 #ifdef EXPERIMENTAL_DSN_INFO
2050 sx->smtp_greeting = NULL;
2051 sx->helo_response = NULL;
2054 smtp_command = US"initial connection";
2055 sx->buffer[0] = '\0';
2057 /* Set up the buffer for reading SMTP response packets. */
2059 sx->inblock.buffer = sx->inbuffer;
2060 sx->inblock.buffersize = sizeof(sx->inbuffer);
2061 sx->inblock.ptr = sx->inbuffer;
2062 sx->inblock.ptrend = sx->inbuffer;
2064 /* Set up the buffer for holding SMTP commands while pipelining */
2066 sx->outblock.buffer = sx->outbuffer;
2067 sx->outblock.buffersize = sizeof(sx->outbuffer);
2068 sx->outblock.ptr = sx->outbuffer;
2069 sx->outblock.cmd_count = 0;
2070 sx->outblock.authenticating = FALSE;
2071 sx->outblock.conn_args = NULL;
2073 /* Reset the parameters of a TLS session. */
2076 tls_out.cipher = NULL; /* the one we may use for this transport */
2077 tls_out.ourcert = NULL;
2078 tls_out.peercert = NULL;
2079 tls_out.peerdn = NULL;
2083 tls_out.ocsp = OCSP_NOT_REQ;
2084 #ifdef EXPERIMENTAL_TLS_RESUME
2085 tls_out.resumption = 0;
2088 /* Flip the legacy TLS-related variables over to the outbound set in case
2089 they're used in the context of the transport. Don't bother resetting
2090 afterward (when being used by a transport) as we're in a subprocess.
2091 For verify, unflipped once the callout is dealt with */
2093 tls_modify_variables(&tls_out);
2098 set_errno_nohost(sx->addrlist, ERRNO_TLSFAILURE, US"TLS support not available",
2104 /* Make a connection to the host if this isn't a continued delivery, and handle
2105 the initial interaction and HELO/EHLO/LHLO. Connect timeout errors are handled
2106 specially so they can be identified for retries. */
2108 if (!continue_hostname)
2111 HDEBUG(D_verify) debug_printf("interface=%s port=%d\n", sx->conn_args.interface, sx->port);
2113 /* Get the actual port the connection will use, into sx->conn_args.host */
2115 smtp_port_for_connect(sx->conn_args.host, sx->port);
2118 /* Do TLSA lookup for DANE */
2120 tls_out.dane_verified = FALSE;
2121 tls_out.tlsa_usage = 0;
2123 if (sx->conn_args.host->dnssec == DS_YES)
2126 if( sx->dane_required
2127 || verify_check_given_host(CUSS &ob->hosts_try_dane, sx->conn_args.host) == OK
2129 switch (rc = tlsa_lookup(sx->conn_args.host, &sx->conn_args.tlsa_dnsa, sx->dane_required))
2131 case OK: sx->conn_args.dane = TRUE;
2132 ob->tls_tempfail_tryclear = FALSE;
2134 case FAIL_FORCED: break;
2135 default: set_errno_nohost(sx->addrlist, ERRNO_DNSDEFER,
2136 string_sprintf("DANE error: tlsa lookup %s",
2139 # ifndef DISABLE_EVENT
2140 (void) event_raise(sx->conn_args.tblock->event_action,
2141 US"dane:fail", sx->dane_required
2142 ? US"dane-required" : US"dnssec-invalid");
2147 else if (sx->dane_required)
2149 set_errno_nohost(sx->addrlist, ERRNO_DNSDEFER,
2150 string_sprintf("DANE error: %s lookup not DNSSEC", sx->conn_args.host->name),
2152 # ifndef DISABLE_EVENT
2153 (void) event_raise(sx->conn_args.tblock->event_action,
2154 US"dane:fail", US"dane-required");
2161 /* Make the TCP connection */
2163 sx->cctx.tls_ctx = NULL;
2164 sx->inblock.cctx = sx->outblock.cctx = &sx->cctx;
2165 sx->avoid_option = sx->peer_offered = smtp_peer_options = 0;
2167 #ifndef DISABLE_PIPE_CONNECT
2168 if ( verify_check_given_host(CUSS &ob->hosts_pipe_connect,
2169 sx->conn_args.host) == OK)
2171 /* We don't find out the local ip address until the connect, so if
2172 the helo string might use it avoid doing early-pipelining. */
2175 || !Ustrstr(sx->helo_data, "$sending_ip_address")
2176 || Ustrstr(sx->helo_data, "def:sending_ip_address")
2179 sx->early_pipe_ok = TRUE;
2180 if ( read_ehlo_cache_entry(sx)
2181 && sx->ehlo_resp.cleartext_features & OPTION_EARLY_PIPE)
2184 debug_printf("Using cached cleartext PIPE_CONNECT\n");
2185 sx->early_pipe_active = TRUE;
2186 sx->peer_offered = sx->ehlo_resp.cleartext_features;
2189 else DEBUG(D_transport)
2190 debug_printf("helo needs $sending_ip_address\n");
2192 if (sx->early_pipe_active)
2193 sx->outblock.conn_args = &sx->conn_args;
2197 if ((sx->cctx.sock = smtp_connect(&sx->conn_args, NULL)) < 0)
2199 set_errno_nohost(sx->addrlist,
2200 errno == ETIMEDOUT ? ERRNO_CONNECTTIMEOUT : errno,
2201 sx->verify ? US strerror(errno) : NULL,
2203 sx->send_quit = FALSE;
2207 /* Expand the greeting message while waiting for the initial response. (Makes
2208 sense if helo_data contains ${lookup dnsdb ...} stuff). The expansion is
2209 delayed till here so that $sending_interface and $sending_port are set. */
2210 /*XXX early-pipe: they still will not be. Is there any way to find out what they
2211 will be? Somehow I doubt it. */
2214 if (!(sx->helo_data = expand_string(sx->helo_data)))
2216 log_write(0, LOG_MAIN|LOG_PANIC,
2217 "<%s>: failed to expand transport's helo_data value for callout: %s",
2218 sx->addrlist->address, expand_string_message);
2223 expand_string_message = NULL;
2224 if ((sx->helo_data = string_domain_utf8_to_alabel(sx->helo_data,
2225 &expand_string_message)),
2226 expand_string_message)
2228 log_write(0, LOG_MAIN|LOG_PANIC,
2229 "<%s>: failed to expand transport's helo_data value for callout: %s",
2230 sx->addrlist->address, expand_string_message);
2232 sx->helo_data = NULL;
2236 /* The first thing is to wait for an initial OK response. The dreaded "goto"
2237 is nevertheless a reasonably clean way of programming this kind of logic,
2238 where you want to escape on any error. */
2242 #ifndef DISABLE_PIPE_CONNECT
2243 if (sx->early_pipe_active)
2245 sx->pending_BANNER = TRUE; /* sync_responses() must eventually handle */
2246 sx->outblock.cmd_count = 1;
2252 (void) setsockopt(sx->cctx.sock, IPPROTO_TCP, TCP_QUICKACK, US &off,
2255 if (!smtp_reap_banner(sx))
2256 goto RESPONSE_FAILED;
2259 #ifndef DISABLE_EVENT
2262 lookup_dnssec_authenticated = sx->conn_args.host->dnssec==DS_YES ? US"yes"
2263 : sx->conn_args.host->dnssec==DS_NO ? US"no" : NULL;
2264 s = event_raise(sx->conn_args.tblock->event_action, US"smtp:connect", sx->buffer);
2267 set_errno_nohost(sx->addrlist, ERRNO_EXPANDFAIL,
2268 string_sprintf("deferred by smtp:connect event expansion: %s", s),
2276 /* Now check if the helo_data expansion went well, and sign off cleanly if
2281 message = string_sprintf("failed to expand helo_data: %s",
2282 expand_string_message);
2283 set_errno_nohost(sx->addrlist, ERRNO_EXPANDFAIL, message, DEFER, FALSE);
2289 /** Debugging without sending a message
2290 sx->addrlist->transport_return = DEFER;
2294 /* Errors that occur after this point follow an SMTP command, which is
2295 left in big_buffer by smtp_write_command() for use in error messages. */
2297 smtp_command = big_buffer;
2299 /* Tell the remote who we are...
2301 February 1998: A convention has evolved that ESMTP-speaking MTAs include the
2302 string "ESMTP" in their greeting lines, so make Exim send EHLO if the
2303 greeting is of this form. The assumption was that the far end supports it
2304 properly... but experience shows that there are some that give 5xx responses,
2305 even though the banner includes "ESMTP" (there's a bloody-minded one that
2306 says "ESMTP not spoken here"). Cope with that case.
2308 September 2000: Time has passed, and it seems reasonable now to always send
2309 EHLO at the start. It is also convenient to make the change while installing
2312 July 2003: Joachim Wieland met a broken server that advertises "PIPELINING"
2313 but times out after sending MAIL FROM, RCPT TO and DATA all together. There
2314 would be no way to send out the mails, so there is now a host list
2315 "hosts_avoid_esmtp" that disables ESMTP for special hosts and solves the
2316 PIPELINING problem as well. Maybe it can also be useful to cure other
2317 problems with broken servers.
2319 Exim originally sent "Helo" at this point and ran for nearly a year that way.
2320 Then somebody tried it with a Microsoft mailer... It seems that all other
2321 mailers use upper case for some reason (the RFC is quite clear about case
2322 independence) so, for peace of mind, I gave in. */
2324 sx->esmtp = verify_check_given_host(CUSS &ob->hosts_avoid_esmtp, sx->conn_args.host) != OK;
2326 /* Alas; be careful, since this goto is not an error-out, so conceivably
2327 we might set data between here and the target which we assume to exist
2328 and be usable. I can see this coming back to bite us. */
2332 smtp_peer_options |= OPTION_TLS;
2333 suppress_tls = FALSE;
2334 ob->tls_tempfail_tryclear = FALSE;
2335 smtp_command = US"SSL-on-connect";
2342 if (smtp_write_command(sx,
2343 #ifndef DISABLE_PIPE_CONNECT
2344 sx->early_pipe_active ? SCMD_BUFFER :
2347 "%s %s\r\n", sx->lmtp ? "LHLO" : "EHLO", sx->helo_data) < 0)
2349 sx->esmtp_sent = TRUE;
2351 #ifndef DISABLE_PIPE_CONNECT
2352 if (sx->early_pipe_active)
2354 sx->pending_EHLO = TRUE;
2356 /* If we have too many authenticators to handle and might need to AUTH
2357 for this transport, pipeline no further as we will need the
2358 list of auth methods offered. Reap the banner and EHLO. */
2360 if ( (ob->hosts_require_auth || ob->hosts_try_auth)
2361 && f.smtp_in_early_pipe_no_auth)
2363 DEBUG(D_transport) debug_printf("may need to auth, so pipeline no further\n");
2364 if (smtp_write_command(sx, SCMD_FLUSH, NULL) < 0)
2366 if (sync_responses(sx, 2, 0) != 0)
2369 debug_printf("failed reaping pipelined cmd responses\n");
2370 goto RESPONSE_FAILED;
2372 sx->early_pipe_active = FALSE;
2377 if (!smtp_reap_ehlo(sx))
2378 goto RESPONSE_FAILED;
2382 debug_printf("not sending EHLO (host matches hosts_avoid_esmtp)\n");
2384 #ifndef DISABLE_PIPE_CONNECT
2385 if (!sx->early_pipe_active)
2390 int n = sizeof(sx->buffer);
2391 uschar * rsp = sx->buffer;
2393 if (sx->esmtp_sent && (n = Ustrlen(sx->buffer)) < sizeof(sx->buffer)/2)
2394 { rsp = sx->buffer + n + 1; n = sizeof(sx->buffer) - n; }
2396 if (smtp_write_command(sx, SCMD_FLUSH, "HELO %s\r\n", sx->helo_data) < 0)
2398 good_response = smtp_read_response(sx, rsp, n, '2', ob->command_timeout);
2399 #ifdef EXPERIMENTAL_DSN_INFO
2400 sx->helo_response = string_copy(rsp);
2404 /* Handle special logging for a closed connection after HELO
2405 when had previously sent EHLO */
2407 if (rsp != sx->buffer && rsp[0] == 0 && (errno == 0 || errno == ECONNRESET))
2409 errno = ERRNO_SMTPCLOSED;
2410 goto EHLOHELO_FAILED;
2412 memmove(sx->buffer, rsp, Ustrlen(rsp));
2413 goto RESPONSE_FAILED;
2417 if (sx->esmtp || sx->lmtp)
2419 #ifndef DISABLE_PIPE_CONNECT
2420 if (!sx->early_pipe_active)
2423 sx->peer_offered = ehlo_response(sx->buffer,
2424 OPTION_TLS /* others checked later */
2425 #ifndef DISABLE_PIPE_CONNECT
2426 | (sx->early_pipe_ok
2428 | OPTION_CHUNKING | OPTION_PRDR | OPTION_DSN | OPTION_PIPE | OPTION_SIZE
2437 #ifndef DISABLE_PIPE_CONNECT
2438 if (sx->early_pipe_ok)
2440 sx->ehlo_resp.cleartext_features = sx->peer_offered;
2442 if ( (sx->peer_offered & (OPTION_PIPE | OPTION_EARLY_PIPE))
2443 == (OPTION_PIPE | OPTION_EARLY_PIPE))
2445 DEBUG(D_transport) debug_printf("PIPE_CONNECT usable in future for this IP\n");
2446 sx->ehlo_resp.cleartext_auths = study_ehlo_auths(sx);
2447 write_ehlo_cache_entry(sx);
2453 /* Set tls_offered if the response to EHLO specifies support for STARTTLS. */
2456 smtp_peer_options |= sx->peer_offered & OPTION_TLS;
2461 /* For continuing deliveries down the same channel, having re-exec'd the socket
2462 is the standard input; for a socket held open from verify it is recorded
2463 in the cutthrough context block. Either way we don't need to redo EHLO here
2464 (but may need to do so for TLS - see below).
2465 Set up the pointer to where subsequent commands will be left, for
2466 error messages. Note that smtp_peer_options will have been
2467 set from the command line if they were set in the process that passed the
2470 /*XXX continue case needs to propagate DSN_INFO, prob. in deliver.c
2471 as the continue goes via transport_pass_socket() and doublefork and exec.
2472 It does not wait. Unclear how we keep separate host's responses
2473 separate - we could match up by host ip+port as a bodge. */
2477 if (cutthrough.cctx.sock >= 0 && cutthrough.callout_hold_only)
2479 sx->cctx = cutthrough.cctx;
2480 sx->conn_args.host->port = sx->port = cutthrough.host.port;
2484 sx->cctx.sock = 0; /* stdin */
2485 sx->cctx.tls_ctx = NULL;
2486 smtp_port_for_connect(sx->conn_args.host, sx->port); /* Record the port that was used */
2488 sx->inblock.cctx = sx->outblock.cctx = &sx->cctx;
2489 smtp_command = big_buffer;
2490 sx->helo_data = NULL; /* ensure we re-expand ob->helo_data */
2492 /* For a continued connection with TLS being proxied for us, or a
2493 held-open verify connection with TLS, nothing more to do. */
2495 if ( continue_proxy_cipher
2496 || (cutthrough.cctx.sock >= 0 && cutthrough.callout_hold_only
2497 && cutthrough.is_tls)
2500 sx->peer_offered = smtp_peer_options;
2501 sx->pipelining_used = pipelining_active = !!(smtp_peer_options & OPTION_PIPE);
2502 HDEBUG(D_transport) debug_printf("continued connection, %s TLS\n",
2503 continue_proxy_cipher ? "proxied" : "verify conn with");
2506 HDEBUG(D_transport) debug_printf("continued connection, no TLS\n");
2509 /* If TLS is available on this connection, whether continued or not, attempt to
2510 start up a TLS session, unless the host is in hosts_avoid_tls. If successful,
2511 send another EHLO - the server may give a different answer in secure mode. We
2512 use a separate buffer for reading the response to STARTTLS so that if it is
2513 negative, the original EHLO data is available for subsequent analysis, should
2514 the client not be required to use TLS. If the response is bad, copy the buffer
2515 for error analysis. */
2518 if ( smtp_peer_options & OPTION_TLS
2520 && verify_check_given_host(CUSS &ob->hosts_avoid_tls, sx->conn_args.host) != OK
2522 || verify_check_given_host(CUSS &ob->hosts_verify_avoid_tls, sx->conn_args.host) != OK
2525 uschar buffer2[4096];
2527 if (smtp_write_command(sx, SCMD_FLUSH, "STARTTLS\r\n") < 0)
2530 #ifndef DISABLE_PIPE_CONNECT
2531 /* If doing early-pipelining reap the banner and EHLO-response but leave
2532 the response for the STARTTLS we just sent alone. */
2534 if (sx->early_pipe_active && sync_responses(sx, 2, 0) != 0)
2537 debug_printf("failed reaping pipelined cmd responses\n");
2538 goto RESPONSE_FAILED;
2542 /* If there is an I/O error, transmission of this message is deferred. If
2543 there is a temporary rejection of STARRTLS and tls_tempfail_tryclear is
2544 false, we also defer. However, if there is a temporary rejection of STARTTLS
2545 and tls_tempfail_tryclear is true, or if there is an outright rejection of
2546 STARTTLS, we carry on. This means we will try to send the message in clear,
2547 unless the host is in hosts_require_tls (tested below). */
2549 if (!smtp_read_response(sx, buffer2, sizeof(buffer2), '2', ob->command_timeout))
2553 || (buffer2[0] == '4' && !ob->tls_tempfail_tryclear)
2556 Ustrncpy(sx->buffer, buffer2, sizeof(sx->buffer));
2557 sx->buffer[sizeof(sx->buffer)-1] = '\0';
2558 goto RESPONSE_FAILED;
2562 /* STARTTLS accepted: try to negotiate a TLS session. */
2567 if (!tls_client_start(&sx->cctx, &sx->conn_args, sx->addrlist, &tls_out, &tls_errstr))
2569 /* TLS negotiation failed; give an error. From outside, this function may
2570 be called again to try in clear on a new connection, if the options permit
2571 it for this host. */
2575 DEBUG(D_tls) debug_printf("TLS session fail: %s\n", tls_errstr);
2577 # ifdef SUPPORT_DANE
2578 if (sx->conn_args.dane)
2580 log_write(0, LOG_MAIN,
2581 "DANE attempt failed; TLS connection to %s [%s]: %s",
2582 sx->conn_args.host->name, sx->conn_args.host->address, tls_errstr);
2583 # ifndef DISABLE_EVENT
2584 (void) event_raise(sx->conn_args.tblock->event_action,
2585 US"dane:fail", US"validation-failure"); /* could do with better detail */
2590 errno = ERRNO_TLSFAILURE;
2591 message = string_sprintf("TLS session: %s", tls_errstr);
2592 sx->send_quit = FALSE;
2596 /* TLS session is set up */
2598 smtp_peer_options_wrap = smtp_peer_options;
2599 for (address_item * addr = sx->addrlist; addr; addr = addr->next)
2600 if (addr->transport_return == PENDING_DEFER)
2602 addr->cipher = tls_out.cipher;
2603 addr->ourcert = tls_out.ourcert;
2604 addr->peercert = tls_out.peercert;
2605 addr->peerdn = tls_out.peerdn;
2606 addr->ocsp = tls_out.ocsp;
2611 /* if smtps, we'll have smtp_command set to something else; always safe to
2613 smtp_command = big_buffer;
2615 /* If we started TLS, redo the EHLO/LHLO exchange over the secure channel. If
2616 helo_data is null, we are dealing with a connection that was passed from
2617 another process, and so we won't have expanded helo_data above. We have to
2618 expand it here. $sending_ip_address and $sending_port are set up right at the
2619 start of the Exim process (in exim.c). */
2621 if (tls_out.active.sock >= 0)
2623 uschar * greeting_cmd;
2625 if (!sx->helo_data && !(sx->helo_data = expand_string(ob->helo_data)))
2627 uschar *message = string_sprintf("failed to expand helo_data: %s",
2628 expand_string_message);
2629 set_errno_nohost(sx->addrlist, ERRNO_EXPANDFAIL, message, DEFER, FALSE);
2634 #ifndef DISABLE_PIPE_CONNECT
2635 /* For SMTPS there is no cleartext early-pipe; use the crypted permission bit.
2636 We're unlikely to get the group sent and delivered before the server sends its
2637 banner, but it's still worth sending as a group.
2638 For STARTTLS allow for cleartext early-pipe but no crypted early-pipe, but not
2641 if (sx->smtps ? sx->early_pipe_ok : sx->early_pipe_active)
2643 sx->peer_offered = sx->ehlo_resp.crypted_features;
2644 if ((sx->early_pipe_active =
2645 !!(sx->ehlo_resp.crypted_features & OPTION_EARLY_PIPE)))
2646 DEBUG(D_transport) debug_printf("Using cached crypted PIPE_CONNECT\n");
2650 /* For SMTPS we need to wait for the initial OK response. */
2652 #ifndef DISABLE_PIPE_CONNECT
2653 if (sx->early_pipe_active)
2655 sx->pending_BANNER = TRUE;
2656 sx->outblock.cmd_count = 1;
2660 if (!smtp_reap_banner(sx))
2661 goto RESPONSE_FAILED;
2664 greeting_cmd = US"LHLO";
2666 greeting_cmd = US"EHLO";
2669 greeting_cmd = US"HELO";
2671 debug_printf("not sending EHLO (host matches hosts_avoid_esmtp)\n");
2674 if (smtp_write_command(sx,
2675 #ifndef DISABLE_PIPE_CONNECT
2676 sx->early_pipe_active ? SCMD_BUFFER :
2679 "%s %s\r\n", greeting_cmd, sx->helo_data) < 0)
2682 #ifndef DISABLE_PIPE_CONNECT
2683 if (sx->early_pipe_active)
2684 sx->pending_EHLO = TRUE;
2688 if (!smtp_reap_ehlo(sx))
2691 /* The GnuTLS layer in Exim only spots a server-rejection of a client
2692 cert late, under TLS1.3 - which means here; the first time we try to
2693 receive crypted data. Treat it as if it was a connect-time failure.
2694 See also the early-pipe equivalent... which will be hard; every call
2695 to sync_responses will need to check the result.
2696 It would be nicer to have GnuTLS check the cert during the handshake.
2697 Can it do that, with all the flexibility we need? */
2699 tls_errstr = US"error on first read";
2700 goto GNUTLS_CONN_FAILED;
2703 goto RESPONSE_FAILED;
2705 smtp_peer_options = 0;
2709 /* If the host is required to use a secure channel, ensure that we
2713 # ifdef SUPPORT_DANE
2714 || sx->conn_args.dane
2716 || verify_check_given_host(CUSS &ob->hosts_require_tls, sx->conn_args.host) == OK
2719 errno = ERRNO_TLSREQUIRED;
2720 message = string_sprintf("a TLS session is required, but %s",
2721 smtp_peer_options & OPTION_TLS
2722 ? "an attempt to start TLS failed" : "the server did not offer TLS support");
2723 # if defined(SUPPORT_DANE) && !defined(DISABLE_EVENT)
2724 if (sx->conn_args.dane)
2725 (void) event_raise(sx->conn_args.tblock->event_action, US"dane:fail",
2726 smtp_peer_options & OPTION_TLS
2727 ? US"validation-failure" /* could do with better detail */
2728 : US"starttls-not-supported");
2732 #endif /*DISABLE_TLS*/
2734 /* If TLS is active, we have just started it up and re-done the EHLO command,
2735 so its response needs to be analyzed. If TLS is not active and this is a
2736 continued session down a previously-used socket, we haven't just done EHLO, so
2739 if (continue_hostname == NULL
2741 || tls_out.active.sock >= 0
2745 if (sx->esmtp || sx->lmtp)
2747 #ifndef DISABLE_PIPE_CONNECT
2748 if (!sx->early_pipe_active)
2751 sx->peer_offered = ehlo_response(sx->buffer,
2753 #ifndef DISABLE_PIPE_CONNECT
2754 | (sx->lmtp && ob->lmtp_ignore_quota ? OPTION_IGNQ : 0)
2755 | OPTION_DSN | OPTION_PIPE | OPTION_SIZE
2756 | OPTION_CHUNKING | OPTION_PRDR | OPTION_UTF8
2757 | (tls_out.active.sock >= 0 ? OPTION_EARLY_PIPE : 0) /* not for lmtp */
2761 | (sx->lmtp && ob->lmtp_ignore_quota ? OPTION_IGNQ : 0)
2764 # ifdef SUPPORT_I18N
2765 | (sx->addrlist->prop.utf8_msg ? OPTION_UTF8 : 0)
2766 /*XXX if we hand peercaps on to continued-conn processes,
2767 must not depend on this addr */
2771 | (ob->size_addition >= 0 ? OPTION_SIZE : 0)
2774 #ifndef DISABLE_PIPE_CONNECT
2775 if (tls_out.active.sock >= 0)
2776 sx->ehlo_resp.crypted_features = sx->peer_offered;
2780 /* Set for IGNOREQUOTA if the response to LHLO specifies support and the
2781 lmtp_ignore_quota option was set. */
2783 sx->igquotstr = sx->peer_offered & OPTION_IGNQ ? US" IGNOREQUOTA" : US"";
2785 /* If the response to EHLO specified support for the SIZE parameter, note
2786 this, provided size_addition is non-negative. */
2788 smtp_peer_options |= sx->peer_offered & OPTION_SIZE;
2790 /* Note whether the server supports PIPELINING. If hosts_avoid_esmtp matched
2791 the current host, esmtp will be false, so PIPELINING can never be used. If
2792 the current host matches hosts_avoid_pipelining, don't do it. */
2794 if ( sx->peer_offered & OPTION_PIPE
2795 && verify_check_given_host(CUSS &ob->hosts_avoid_pipelining, sx->conn_args.host) != OK)
2796 smtp_peer_options |= OPTION_PIPE;
2798 DEBUG(D_transport) debug_printf("%susing PIPELINING\n",
2799 smtp_peer_options & OPTION_PIPE ? "" : "not ");
2801 if ( sx->peer_offered & OPTION_CHUNKING
2802 && verify_check_given_host(CUSS &ob->hosts_try_chunking, sx->conn_args.host) != OK)
2803 sx->peer_offered &= ~OPTION_CHUNKING;
2805 if (sx->peer_offered & OPTION_CHUNKING)
2806 DEBUG(D_transport) debug_printf("CHUNKING usable\n");
2808 #ifndef DISABLE_PRDR
2809 if ( sx->peer_offered & OPTION_PRDR
2810 && verify_check_given_host(CUSS &ob->hosts_try_prdr, sx->conn_args.host) != OK)
2811 sx->peer_offered &= ~OPTION_PRDR;
2813 if (sx->peer_offered & OPTION_PRDR)
2814 DEBUG(D_transport) debug_printf("PRDR usable\n");
2817 /* Note if the server supports DSN */
2818 smtp_peer_options |= sx->peer_offered & OPTION_DSN;
2819 DEBUG(D_transport) debug_printf("%susing DSN\n",
2820 sx->peer_offered & OPTION_DSN ? "" : "not ");
2822 #ifndef DISABLE_PIPE_CONNECT
2823 if ( sx->early_pipe_ok
2824 && !sx->early_pipe_active
2825 && tls_out.active.sock >= 0
2826 && smtp_peer_options & OPTION_PIPE
2827 && ( sx->ehlo_resp.cleartext_features | sx->ehlo_resp.crypted_features)
2828 & OPTION_EARLY_PIPE)
2830 DEBUG(D_transport) debug_printf("PIPE_CONNECT usable in future for this IP\n");
2831 sx->ehlo_resp.crypted_auths = study_ehlo_auths(sx);
2832 write_ehlo_cache_entry(sx);
2836 /* Note if the response to EHLO specifies support for the AUTH extension.
2837 If it has, check that this host is one we want to authenticate to, and do
2838 the business. The host name and address must be available when the
2839 authenticator's client driver is running. */
2841 switch (yield = smtp_auth(sx))
2843 default: goto SEND_QUIT;
2845 case FAIL_SEND: goto SEND_FAILED;
2846 case FAIL: goto RESPONSE_FAILED;
2850 sx->pipelining_used = pipelining_active = !!(smtp_peer_options & OPTION_PIPE);
2852 /* The setting up of the SMTP call is now complete. Any subsequent errors are
2853 message-specific. */
2855 sx->setting_up = FALSE;
2858 if (sx->addrlist->prop.utf8_msg)
2862 /* If the transport sets a downconversion mode it overrides any set by ACL
2865 if ((s = ob->utf8_downconvert))
2867 if (!(s = expand_string(s)))
2869 message = string_sprintf("failed to expand utf8_downconvert: %s",
2870 expand_string_message);
2871 set_errno_nohost(sx->addrlist, ERRNO_EXPANDFAIL, message, DEFER, FALSE);
2877 case '1': sx->addrlist->prop.utf8_downcvt = TRUE;
2878 sx->addrlist->prop.utf8_downcvt_maybe = FALSE;
2880 case '0': sx->addrlist->prop.utf8_downcvt = FALSE;
2881 sx->addrlist->prop.utf8_downcvt_maybe = FALSE;
2883 case '-': if (s[1] == '1')
2885 sx->addrlist->prop.utf8_downcvt = FALSE;
2886 sx->addrlist->prop.utf8_downcvt_maybe = TRUE;
2892 sx->utf8_needed = !sx->addrlist->prop.utf8_downcvt
2893 && !sx->addrlist->prop.utf8_downcvt_maybe;
2894 DEBUG(D_transport) if (!sx->utf8_needed)
2895 debug_printf("utf8: %s downconvert\n",
2896 sx->addrlist->prop.utf8_downcvt ? "mandatory" : "optional");
2899 /* If this is an international message we need the host to speak SMTPUTF8 */
2900 if (sx->utf8_needed && !(sx->peer_offered & OPTION_UTF8))
2902 errno = ERRNO_UTF8_FWD;
2903 goto RESPONSE_FAILED;
2905 #endif /*SUPPORT_I18N*/
2914 if (errno == ECONNREFUSED) /* first-read error on a TFO conn */
2916 /* There is a testing facility for simulating a connection timeout, as I
2917 can't think of any other way of doing this. It converts a connection
2918 refused into a timeout if the timeout is set to 999999. This is done for
2919 a 3whs connection in ip_connect(), but a TFO connection does not error
2920 there - instead it gets ECONNREFUSED on the first data read. Tracking
2921 that a TFO really was done is too hard, or we would set a
2922 sx->pending_conn_done bit and test that in smtp_reap_banner() and
2923 smtp_reap_ehlo(). That would let us also add the conn-timeout to the
2926 if (f.running_in_test_harness && ob->connect_timeout == 999999)
2928 set_errno_nohost(sx->addrlist,
2929 errno == ETIMEDOUT ? ERRNO_CONNECTTIMEOUT : errno,
2930 sx->verify ? US strerror(errno) : NULL,
2932 sx->send_quit = FALSE;
2936 /* really an error on an SMTP read */
2938 sx->send_quit = check_response(sx->conn_args.host, &errno, sx->addrlist->more_errno,
2939 sx->buffer, &code, &message, &pass_message);
2945 message = US string_sprintf("send() to %s [%s] failed: %s",
2946 sx->conn_args.host->name, sx->conn_args.host->address, strerror(errno));
2947 sx->send_quit = FALSE;
2953 message = string_sprintf("Remote host closed connection in response to %s"
2954 " (EHLO response was: %s)", smtp_command, sx->buffer);
2955 sx->send_quit = FALSE;
2959 /* This label is jumped to directly when a TLS negotiation has failed,
2960 or was not done for a host for which it is required. Values will be set
2961 in message and errno, and setting_up will always be true. Treat as
2962 a temporary error. */
2966 code = '4', yield = DEFER;
2970 /* The failure happened while setting up the call; see if the failure was
2971 a 5xx response (this will either be on connection, or following HELO - a 5xx
2972 after EHLO causes it to try HELO). If so, and there are no more hosts to try,
2973 fail all addresses, as this host is never going to accept them. For other
2974 errors during setting up (timeouts or whatever), defer all addresses, and
2975 yield DEFER, so that the host is not tried again for a while.
2977 XXX This peeking for another host feels like a layering violation. We want
2978 to note the host as unusable, but down here we shouldn't know if this was
2979 the last host to try for the addr(list). Perhaps the upper layer should be
2980 the one to do set_errno() ? The problem is that currently the addr is where
2981 errno etc. are stashed, but until we run out of hosts to try the errors are
2982 host-specific. Maybe we should enhance the host_item definition? */
2985 sx->ok = FALSE; /* For when reached by GOTO */
2986 set_errno(sx->addrlist, errno, message,
2987 sx->conn_args.host->next
2991 || errno == ERRNO_UTF8_FWD
2995 errno == ECONNREFUSED ? NULL : sx->conn_args.host
2996 #ifdef EXPERIMENTAL_DSN_INFO
2997 , sx->smtp_greeting, sx->helo_response
3006 (void)smtp_write_command(sx, SCMD_FLUSH, "QUIT\r\n");
3009 if (sx->cctx.tls_ctx)
3011 tls_close(sx->cctx.tls_ctx, TLS_SHUTDOWN_NOWAIT);
3012 sx->cctx.tls_ctx = NULL;
3016 /* Close the socket, and return the appropriate value, first setting
3017 works because the NULL setting is passed back to the calling process, and
3018 remote_max_parallel is forced to 1 when delivering over an existing connection,
3021 HDEBUG(D_transport|D_acl|D_v) debug_printf_indent(" SMTP(close)>>\n");
3024 shutdown(sx->cctx.sock, SHUT_WR);
3025 if (fcntl(sx->cctx.sock, F_SETFL, O_NONBLOCK) == 0)
3026 for (int i = 16; read(sx->cctx.sock, sx->inbuffer, sizeof(sx->inbuffer)) > 0 && i > 0;)
3027 i--; /* drain socket */
3028 sx->send_quit = FALSE;
3030 (void)close(sx->cctx.sock);
3033 #ifndef DISABLE_EVENT
3034 (void) event_raise(sx->conn_args.tblock->event_action, US"tcp:close", NULL);
3037 continue_transport = NULL;
3038 continue_hostname = NULL;
3045 /* Create the string of options that will be appended to the MAIL FROM:
3046 in the connection context buffer */
3049 build_mailcmd_options(smtp_context * sx, address_item * addrlist)
3051 uschar * p = sx->buffer;
3052 address_item * addr;
3057 /* If we know the receiving MTA supports the SIZE qualification, and we know it,
3058 send it, adding something to the message size to allow for imprecision
3059 and things that get added en route. Exim keeps the number of lines
3060 in a message, so we can give an accurate value for the original message, but we
3061 need some additional to handle added headers. (Double "." characters don't get
3062 included in the count.) */
3064 if ( message_size > 0
3065 && sx->peer_offered & OPTION_SIZE && !(sx->avoid_option & OPTION_SIZE))
3067 /*XXX problem here under spool_files_wireformat?
3068 Or just forget about lines? Or inflate by a fixed proportion? */
3070 sprintf(CS p, " SIZE=%d", message_size+message_linecount+(SOB sx->conn_args.ob)->size_addition);
3074 #ifndef DISABLE_PRDR
3075 /* If it supports Per-Recipient Data Responses, and we have more than one recipient,
3078 sx->prdr_active = FALSE;
3079 if (sx->peer_offered & OPTION_PRDR)
3080 for (address_item * addr = addrlist; addr; addr = addr->next)
3081 if (addr->transport_return == PENDING_DEFER)
3083 for (addr = addr->next; addr; addr = addr->next)
3084 if (addr->transport_return == PENDING_DEFER)
3085 { /* at least two recipients to send */
3086 sx->prdr_active = TRUE;
3087 sprintf(CS p, " PRDR"); p += 5;
3095 /* If it supports internationalised messages, and this meesage need that,
3098 if ( sx->peer_offered & OPTION_UTF8
3099 && addrlist->prop.utf8_msg
3100 && !addrlist->prop.utf8_downcvt
3102 Ustrcpy(p, US" SMTPUTF8"), p += 9;
3105 /* check if all addresses have DSN-lasthop flag; do not send RET and ENVID if so */
3106 for (sx->dsn_all_lasthop = TRUE, addr = addrlist, address_count = 0;
3107 addr && address_count < sx->max_rcpt;
3108 addr = addr->next) if (addr->transport_return == PENDING_DEFER)
3111 if (!(addr->dsn_flags & rf_dsnlasthop))
3113 sx->dsn_all_lasthop = FALSE;
3118 /* Add any DSN flags to the mail command */
3120 if (sx->peer_offered & OPTION_DSN && !sx->dsn_all_lasthop)
3122 if (dsn_ret == dsn_ret_hdrs)
3123 { Ustrcpy(p, US" RET=HDRS"); p += 9; }
3124 else if (dsn_ret == dsn_ret_full)
3125 { Ustrcpy(p, US" RET=FULL"); p += 9; }
3129 string_format(p, sizeof(sx->buffer) - (p-sx->buffer), " ENVID=%s", dsn_envid);
3134 /* If an authenticated_sender override has been specified for this transport
3135 instance, expand it. If the expansion is forced to fail, and there was already
3136 an authenticated_sender for this message, the original value will be used.
3137 Other expansion failures are serious. An empty result is ignored, but there is
3138 otherwise no check - this feature is expected to be used with LMTP and other
3139 cases where non-standard addresses (e.g. without domains) might be required. */
3141 if (smtp_mail_auth_str(p, sizeof(sx->buffer) - (p-sx->buffer), addrlist, sx->conn_args.ob))
3149 build_rcptcmd_options(smtp_context * sx, const address_item * addr)
3151 uschar * p = sx->buffer;
3154 /* Add any DSN flags to the rcpt command */
3156 if (sx->peer_offered & OPTION_DSN && !(addr->dsn_flags & rf_dsnlasthop))
3158 if (addr->dsn_flags & rf_dsnflags)
3162 Ustrcpy(p, US" NOTIFY=");
3164 for (int i = 0; i < nelem(rf_list); i++) if (addr->dsn_flags & rf_list[i])
3166 if (!first) *p++ = ',';
3168 Ustrcpy(p, rf_names[i]);
3173 if (addr->dsn_orcpt)
3175 string_format(p, sizeof(sx->buffer) - (p-sx->buffer), " ORCPT=%s",
3186 0 good, rcpt results in addr->transport_return (PENDING_OK, DEFER, FAIL)
3187 -1 MAIL response error
3188 -2 any non-MAIL read i/o error
3189 -3 non-MAIL response timeout
3190 -4 internal error; channel still usable
3195 smtp_write_mail_and_rcpt_cmds(smtp_context * sx, int * yield)
3197 address_item * addr;
3201 if (build_mailcmd_options(sx, sx->first_addr) != OK)
3207 /* From here until we send the DATA command, we can make use of PIPELINING
3208 if the server host supports it. The code has to be able to check the responses
3209 at any point, for when the buffer fills up, so we write it totally generally.
3210 When PIPELINING is off, each command written reports that it has flushed the
3213 sx->pending_MAIL = TRUE; /* The block starts with MAIL */
3216 uschar * s = sx->from_addr;
3218 uschar * errstr = NULL;
3220 /* If we must downconvert, do the from-address here. Remember we had to
3221 for the to-addresses (done below), and also (ugly) for re-doing when building
3222 the delivery log line. */
3224 if ( sx->addrlist->prop.utf8_msg
3225 && (sx->addrlist->prop.utf8_downcvt || !(sx->peer_offered & OPTION_UTF8))
3228 if (s = string_address_utf8_to_alabel(s, &errstr), errstr)
3230 set_errno_nohost(sx->addrlist, ERRNO_EXPANDFAIL, errstr, DEFER, FALSE);
3234 setflag(sx->addrlist, af_utf8_downcvt);
3238 rc = smtp_write_command(sx, pipelining_active ? SCMD_BUFFER : SCMD_FLUSH,
3239 "MAIL FROM:<%s>%s\r\n", s, sx->buffer);
3242 mail_command = string_copy(big_buffer); /* Save for later error message */
3246 case -1: /* Transmission error */
3249 case +1: /* Cmd was sent */
3250 if (!smtp_read_response(sx, sx->buffer, sizeof(sx->buffer), '2',
3251 (SOB sx->conn_args.ob)->command_timeout))
3253 if (errno == 0 && sx->buffer[0] == '4')
3255 errno = ERRNO_MAIL4XX;
3256 sx->addrlist->more_errno |= ((sx->buffer[1] - '0')*10 + sx->buffer[2] - '0') << 8;
3260 sx->pending_MAIL = FALSE;
3263 /* otherwise zero: command queued for pipeline */
3266 /* Pass over all the relevant recipient addresses for this host, which are the
3267 ones that have status PENDING_DEFER. If we are using PIPELINING, we can send
3268 several before we have to read the responses for those seen so far. This
3269 checking is done by a subroutine because it also needs to be done at the end.
3270 Send only up to max_rcpt addresses at a time, leaving next_addr pointing to
3271 the next one if not all are sent.
3273 In the MUA wrapper situation, we want to flush the PIPELINING buffer for the
3274 last address because we want to abort if any recipients have any kind of
3275 problem, temporary or permanent. We know that all recipient addresses will have
3276 the PENDING_DEFER status, because only one attempt is ever made, and we know
3277 that max_rcpt will be large, so all addresses will be done at once.
3279 For verify we flush the pipeline after any (the only) rcpt address. */
3281 for (addr = sx->first_addr, address_count = 0;
3282 addr && address_count < sx->max_rcpt;
3283 addr = addr->next) if (addr->transport_return == PENDING_DEFER)
3289 addr->dsn_aware = sx->peer_offered & OPTION_DSN
3290 ? dsn_support_yes : dsn_support_no;
3293 no_flush = pipelining_active && !sx->verify
3294 && (!mua_wrapper || addr->next && address_count < sx->max_rcpt);
3296 build_rcptcmd_options(sx, addr);
3298 /* Now send the RCPT command, and process outstanding responses when
3299 necessary. After a timeout on RCPT, we just end the function, leaving the
3300 yield as OK, because this error can often mean that there is a problem with
3301 just one address, so we don't want to delay the host. */
3303 rcpt_addr = transport_rcpt_address(addr, sx->conn_args.tblock->rcpt_include_affixes);
3306 if ( testflag(sx->addrlist, af_utf8_downcvt)
3307 && !(rcpt_addr = string_address_utf8_to_alabel(rcpt_addr, NULL))
3310 /*XXX could we use a per-address errstr here? Not fail the whole send? */
3311 errno = ERRNO_EXPANDFAIL;
3312 return -5; /*XXX too harsh? */
3316 count = smtp_write_command(sx, no_flush ? SCMD_BUFFER : SCMD_FLUSH,
3317 "RCPT TO:<%s>%s%s\r\n", rcpt_addr, sx->igquotstr, sx->buffer);
3319 if (count < 0) return -5;
3322 switch(sync_responses(sx, count, 0))
3324 case 3: sx->ok = TRUE; /* 2xx & 5xx => OK & progress made */
3325 case 2: sx->completed_addr = TRUE; /* 5xx (only) => progress made */
3328 case 1: sx->ok = TRUE; /* 2xx (only) => OK, but if LMTP, */
3329 if (!sx->lmtp) /* can't tell about progress yet */
3330 sx->completed_addr = TRUE;
3331 case 0: /* No 2xx or 5xx, but no probs */
3334 case -1: return -3; /* Timeout on RCPT */
3335 case -2: return -2; /* non-MAIL read i/o error */
3336 default: return -1; /* any MAIL error */
3338 #ifndef DISABLE_PIPE_CONNECT
3339 case -4: return -1; /* non-2xx for pipelined banner or EHLO */
3340 case -5: return -1; /* TLS first-read error */
3343 sx->pending_MAIL = FALSE; /* Dealt with MAIL */
3345 } /* Loop for next address */
3347 sx->next_addr = addr;
3353 /*****************************************************
3354 * Proxy TLS connection for another transport process *
3355 ******************************************************/
3357 Close the unused end of the pipe, fork once more, then use the given buffer
3358 as a staging area, and select on both the given fd and the TLS'd client-fd for
3359 data to read (per the coding in ip_recv() and fd_ready() this is legitimate).
3360 Do blocking full-size writes, and reads under a timeout. Once both input
3361 channels are closed, exit the process.
3365 buf space to use for buffering
3366 bufsiz size of buffer
3367 pfd pipe filedescriptor array; [0] is comms to proxied process
3368 timeout per-read timeout, seconds
3374 smtp_proxy_tls(void * ct_ctx, uschar * buf, size_t bsize, int * pfd,
3378 int max_fd = MAX(pfd[0], tls_out.active.sock) + 1;
3384 DEBUG(D_transport) debug_printf("proxy-proc final-pid %d\n", rc);
3385 _exit(rc < 0 ? EXIT_FAILURE : EXIT_SUCCESS);
3388 testharness_pause_ms(100); /* let parent debug out */
3389 set_process_info("proxying TLS connection for continued transport");
3391 FD_SET(tls_out.active.sock, &rfds);
3392 FD_SET(pfd[0], &rfds);
3394 for (int fd_bits = 3; fd_bits; )
3396 time_t time_left = timeout;
3397 time_t time_start = time(NULL);
3403 struct timeval tv = { time_left, 0 };
3406 (SELECT_ARG2_TYPE *)&rfds, NULL, (SELECT_ARG2_TYPE *)&efds, &tv);
3408 if (rc < 0 && errno == EINTR)
3409 if ((time_left -= time(NULL) - time_start) > 0) continue;
3413 DEBUG(D_transport) if (rc == 0) debug_printf("%s: timed out\n", __FUNCTION__);
3417 if (FD_ISSET(tls_out.active.sock, &efds) || FD_ISSET(pfd[0], &efds))
3419 DEBUG(D_transport) debug_printf("select: exceptional cond on %s fd\n",
3420 FD_ISSET(pfd[0], &efds) ? "proxy" : "tls");
3424 while (rc < 0 || !(FD_ISSET(tls_out.active.sock, &rfds) || FD_ISSET(pfd[0], &rfds)));
3426 /* handle inbound data */
3427 if (FD_ISSET(tls_out.active.sock, &rfds))
3428 if ((rc = tls_read(ct_ctx, buf, bsize)) <= 0)
3431 FD_CLR(tls_out.active.sock, &rfds);
3432 shutdown(pfd[0], SHUT_WR);
3437 for (int nbytes = 0; rc - nbytes > 0; nbytes += i)
3438 if ((i = write(pfd[0], buf + nbytes, rc - nbytes)) < 0) goto done;
3440 else if (fd_bits & 1)
3441 FD_SET(tls_out.active.sock, &rfds);
3443 /* handle outbound data */
3444 if (FD_ISSET(pfd[0], &rfds))
3445 if ((rc = read(pfd[0], buf, bsize)) <= 0)
3448 tls_close(ct_ctx, TLS_SHUTDOWN_NOWAIT);
3453 for (int nbytes = 0; rc - nbytes > 0; nbytes += i)
3454 if ((i = tls_write(ct_ctx, buf + nbytes, rc - nbytes, FALSE)) < 0)
3457 else if (fd_bits & 2)
3458 FD_SET(pfd[0], &rfds);
3462 testharness_pause_ms(100); /* let logging complete */
3463 exim_exit(0, US"TLS proxy");
3468 /*************************************************
3469 * Deliver address list to given host *
3470 *************************************************/
3472 /* If continue_hostname is not null, we get here only when continuing to
3473 deliver down an existing channel. The channel was passed as the standard
3474 input. TLS is never active on a passed channel; the previous process always
3475 closes it down before passing the connection on.
3477 Otherwise, we have to make a connection to the remote host, and do the
3478 initial protocol exchange.
3480 When running as an MUA wrapper, if the sender or any recipient is rejected,
3481 temporarily or permanently, we force failure for all recipients.
3484 addrlist chain of potential addresses to deliver; only those whose
3485 transport_return field is set to PENDING_DEFER are currently
3486 being processed; others should be skipped - they have either
3487 been delivered to an earlier host or IP address, or been
3488 failed by one of them.
3489 host host to deliver to
3490 host_af AF_INET or AF_INET6
3491 defport default TCP/IP port to use if host does not specify, in host
3493 interface interface to bind to, or NULL
3494 tblock transport instance block
3495 message_defer set TRUE if yield is OK, but all addresses were deferred
3496 because of a non-recipient, non-host failure, that is, a
3497 4xx response to MAIL FROM, DATA, or ".". This is a defer
3498 that is specific to the message.
3499 suppress_tls if TRUE, don't attempt a TLS connection - this is set for
3500 a second attempt after TLS initialization fails
3502 Returns: OK - the connection was made and the delivery attempted;
3503 the result for each address is in its data block.
3504 DEFER - the connection could not be made, or something failed
3505 while setting up the SMTP session, or there was a
3506 non-message-specific error, such as a timeout.
3507 ERROR - a filter command is specified for this transport,
3508 and there was a problem setting it up; OR helo_data
3509 or add_headers or authenticated_sender is specified
3510 for this transport, and the string failed to expand
3514 smtp_deliver(address_item *addrlist, host_item *host, int host_af, int defport,
3515 uschar *interface, transport_instance *tblock,
3516 BOOL *message_defer, BOOL suppress_tls)
3518 smtp_transport_options_block * ob = SOB tblock->options_block;
3522 struct timeval start_delivery_time;
3524 BOOL pass_message = FALSE;
3525 uschar *message = NULL;
3526 uschar new_message_id[MESSAGE_ID_LENGTH + 1];
3530 gettimeofday(&start_delivery_time, NULL);
3531 suppress_tls = suppress_tls; /* stop compiler warning when no TLS support */
3532 *message_defer = FALSE;
3534 sx.addrlist = addrlist;
3535 sx.conn_args.host = host;
3536 sx.conn_args.host_af = host_af,
3538 sx.conn_args.interface = interface;
3539 sx.helo_data = NULL;
3540 sx.conn_args.tblock = tblock;
3542 sx.sync_addr = sx.first_addr = addrlist;
3544 /* Get the channel set up ready for a message (MAIL FROM being the next
3545 SMTP command to send */
3547 if ((rc = smtp_setup_conn(&sx, suppress_tls)) != OK)
3550 /* If there is a filter command specified for this transport, we can now
3551 set it up. This cannot be done until the identify of the host is known. */
3553 if (tblock->filter_command)
3555 transport_filter_timeout = tblock->filter_timeout;
3557 /* On failure, copy the error to all addresses, abandon the SMTP call, and
3560 if (!transport_set_up_command(&transport_filter_argv,
3561 tblock->filter_command, TRUE, DEFER, addrlist,
3562 string_sprintf("%.50s transport", tblock->name), NULL))
3564 set_errno_nohost(addrlist->next, addrlist->basic_errno, addrlist->message, DEFER,
3570 if ( transport_filter_argv
3571 && *transport_filter_argv
3572 && **transport_filter_argv
3573 && sx.peer_offered & OPTION_CHUNKING
3576 sx.peer_offered &= ~OPTION_CHUNKING;
3577 DEBUG(D_transport) debug_printf("CHUNKING not usable due to transport filter\n");
3581 /* For messages that have more than the maximum number of envelope recipients,
3582 we want to send several transactions down the same SMTP connection. (See
3583 comments in deliver.c as to how this reconciles, heuristically, with
3584 remote_max_parallel.) This optimization was added to Exim after the following
3585 code was already working. The simplest way to put it in without disturbing the
3586 code was to use a goto to jump back to this point when there is another
3587 transaction to handle. */
3590 sx.from_addr = return_path;
3591 sx.sync_addr = sx.first_addr;
3593 sx.send_rset = TRUE;
3594 sx.completed_addr = FALSE;
3597 /* If we are a continued-connection-after-verify the MAIL and RCPT
3598 commands were already sent; do not re-send but do mark the addrs as
3599 having been accepted up to RCPT stage. A traditional cont-conn
3600 always has a sequence number greater than one. */
3602 if (continue_hostname && continue_sequence == 1)
3604 sx.peer_offered = smtp_peer_options;
3605 sx.pending_MAIL = FALSE;
3607 sx.next_addr = NULL;
3609 for (address_item * addr = addrlist; addr; addr = addr->next)
3610 addr->transport_return = PENDING_OK;
3614 /* Initiate a message transfer. */
3616 switch(smtp_write_mail_and_rcpt_cmds(&sx, &yield))
3619 case -1: case -2: goto RESPONSE_FAILED;
3620 case -3: goto END_OFF;
3621 case -4: goto SEND_QUIT;
3622 default: goto SEND_FAILED;
3625 /* If we are an MUA wrapper, abort if any RCPTs were rejected, either
3626 permanently or temporarily. We should have flushed and synced after the last
3634 for (a = sx.first_addr, cnt = 0; a && cnt < sx.max_rcpt; a = a->next, cnt++)
3635 if (a->transport_return != PENDING_OK)
3637 /*XXX could we find a better errno than 0 here? */
3638 set_errno_nohost(addrlist, 0, a->message, FAIL,
3639 testflag(a, af_pass_message));
3646 /* If ok is TRUE, we know we have got at least one good recipient, and must now
3647 send DATA, but if it is FALSE (in the normal, non-wrapper case), we may still
3648 have a good recipient buffered up if we are pipelining. We don't want to waste
3649 time sending DATA needlessly, so we only send it if either ok is TRUE or if we
3650 are pipelining. The responses are all handled by sync_responses().
3651 If using CHUNKING, do not send a BDAT until we know how big a chunk we want
3654 if ( !(sx.peer_offered & OPTION_CHUNKING)
3655 && (sx.ok || (pipelining_active && !mua_wrapper)))
3657 int count = smtp_write_command(&sx, SCMD_FLUSH, "DATA\r\n");
3659 if (count < 0) goto SEND_FAILED;
3660 switch(sync_responses(&sx, count, sx.ok ? +1 : -1))
3662 case 3: sx.ok = TRUE; /* 2xx & 5xx => OK & progress made */
3663 case 2: sx.completed_addr = TRUE; /* 5xx (only) => progress made */
3666 case 1: sx.ok = TRUE; /* 2xx (only) => OK, but if LMTP, */
3667 if (!sx.lmtp) sx.completed_addr = TRUE; /* can't tell about progress yet */
3668 case 0: break; /* No 2xx or 5xx, but no probs */
3670 case -1: goto END_OFF; /* Timeout on RCPT */
3672 #ifndef DISABLE_PIPE_CONNECT
3673 case -5: /* TLS first-read error */
3674 case -4: HDEBUG(D_transport)
3675 debug_printf("failed reaping pipelined cmd responses\n");
3677 default: goto RESPONSE_FAILED; /* I/O error, or any MAIL/DATA error */
3679 pipelining_active = FALSE;
3680 data_command = string_copy(big_buffer); /* Save for later error message */
3683 /* If there were no good recipients (but otherwise there have been no
3684 problems), just set ok TRUE, since we have handled address-specific errors
3685 already. Otherwise, it's OK to send the message. Use the check/escape mechanism
3686 for handling the SMTP dot-handling protocol, flagging to apply to headers as
3687 well as body. Set the appropriate timeout value to be used for each chunk.
3688 (Haven't been able to make it work using select() for writing yet.) */
3690 if (!(sx.peer_offered & OPTION_CHUNKING) && !sx.ok)
3692 /* Save the first address of the next batch. */
3693 sx.first_addr = sx.next_addr;
3699 transport_ctx tctx = {
3700 .u = {.fd = sx.cctx.sock}, /*XXX will this need TLS info? */
3703 .check_string = US".",
3704 .escape_string = US"..", /* Escaping strings */
3706 topt_use_crlf | topt_escape_headers
3707 | (tblock->body_only ? topt_no_headers : 0)
3708 | (tblock->headers_only ? topt_no_body : 0)
3709 | (tblock->return_path_add ? topt_add_return_path : 0)
3710 | (tblock->delivery_date_add ? topt_add_delivery_date : 0)
3711 | (tblock->envelope_to_add ? topt_add_envelope_to : 0)
3714 /* If using CHUNKING we need a callback from the generic transport
3715 support to us, for the sending of BDAT smtp commands and the reaping
3716 of responses. The callback needs a whole bunch of state so set up
3717 a transport-context structure to be passed around. */
3719 if (sx.peer_offered & OPTION_CHUNKING)
3721 tctx.check_string = tctx.escape_string = NULL;
3722 tctx.options |= topt_use_bdat;
3723 tctx.chunk_cb = smtp_chunk_cmd_callback;
3724 sx.pending_BDAT = FALSE;
3725 sx.good_RCPT = sx.ok;
3727 tctx.smtp_context = &sx;
3730 tctx.options |= topt_end_dot;
3732 /* Save the first address of the next batch. */
3733 sx.first_addr = sx.next_addr;
3735 /* Responses from CHUNKING commands go in buffer. Otherwise,
3736 there has not been a response. */
3740 sigalrm_seen = FALSE;
3741 transport_write_timeout = ob->data_timeout;
3742 smtp_command = US"sending data block"; /* For error messages */
3743 DEBUG(D_transport|D_v)
3744 if (sx.peer_offered & OPTION_CHUNKING)
3745 debug_printf(" will write message using CHUNKING\n");
3747 debug_printf(" SMTP>> writing message and terminating \".\"\n");
3748 transport_count = 0;
3750 #ifndef DISABLE_DKIM
3752 # ifdef MEASURE_TIMING
3754 gettimeofday(&t0, NULL);
3756 dkim_exim_sign_init();
3757 # ifdef EXPERIMENTAL_ARC
3759 uschar * s = ob->arc_sign;
3762 if (!(ob->dkim.arc_signspec = s = expand_string(s)))
3764 if (!f.expand_string_forcedfail)
3766 message = US"failed to expand arc_sign";
3773 /* Ask dkim code to hash the body for ARC */
3774 (void) arc_ams_setup_sign_bodyhash();
3775 ob->dkim.force_bodyhash = TRUE;
3780 # ifdef MEASURE_TIMING
3781 report_time_since(&t0, US"dkim_exim_sign_init (delta)");
3784 sx.ok = dkim_transport_write_message(&tctx, &ob->dkim, CUSS &message);
3786 sx.ok = transport_write_message(&tctx, 0);
3789 /* transport_write_message() uses write() because it is called from other
3790 places to write to non-sockets. This means that under some OS (e.g. Solaris)
3791 it can exit with "Broken pipe" as its error. This really means that the
3792 socket got closed at the far end. */
3794 transport_write_timeout = 0; /* for subsequent transports */
3796 /* Failure can either be some kind of I/O disaster (including timeout),
3797 or the failure of a transport filter or the expansion of added headers.
3798 Or, when CHUNKING, it can be a protocol-detected failure. */
3801 if (message) goto SEND_FAILED;
3802 else goto RESPONSE_FAILED;
3804 /* We used to send the terminating "." explicitly here, but because of
3805 buffering effects at both ends of TCP/IP connections, you don't gain
3806 anything by keeping it separate, so it might as well go in the final
3807 data buffer for efficiency. This is now done by setting the topt_end_dot
3810 smtp_command = US"end of data";
3812 if (sx.peer_offered & OPTION_CHUNKING && sx.cmd_count > 1)
3814 /* Reap any outstanding MAIL & RCPT commands, but not a DATA-go-ahead */
3815 switch(sync_responses(&sx, sx.cmd_count-1, 0))
3817 case 3: sx.ok = TRUE; /* 2xx & 5xx => OK & progress made */
3818 case 2: sx.completed_addr = TRUE; /* 5xx (only) => progress made */
3821 case 1: sx.ok = TRUE; /* 2xx (only) => OK, but if LMTP, */
3822 if (!sx.lmtp) sx.completed_addr = TRUE; /* can't tell about progress yet */
3823 case 0: break; /* No 2xx or 5xx, but no probs */
3825 case -1: goto END_OFF; /* Timeout on RCPT */
3827 #ifndef DISABLE_PIPE_CONNECT
3828 case -5: /* TLS first-read error */
3829 case -4: HDEBUG(D_transport)
3830 debug_printf("failed reaping pipelined cmd responses\n");
3832 default: goto RESPONSE_FAILED; /* I/O error, or any MAIL/DATA error */
3836 #ifndef DISABLE_PRDR
3837 /* For PRDR we optionally get a partial-responses warning followed by the
3838 individual responses, before going on with the overall response. If we don't
3839 get the warning then deal with per non-PRDR. */
3843 sx.ok = smtp_read_response(&sx, sx.buffer, sizeof(sx.buffer), '3', ob->final_timeout);
3844 if (!sx.ok && errno == 0) switch(sx.buffer[0])
3846 case '2': sx.prdr_active = FALSE;
3849 case '4': errno = ERRNO_DATA4XX;
3850 addrlist->more_errno |=
3851 ((sx.buffer[1] - '0')*10 + sx.buffer[2] - '0') << 8;
3858 /* For non-PRDR SMTP, we now read a single response that applies to the
3859 whole message. If it is OK, then all the addresses have been delivered. */
3863 sx.ok = smtp_read_response(&sx, sx.buffer, sizeof(sx.buffer), '2',
3865 if (!sx.ok && errno == 0 && sx.buffer[0] == '4')
3867 errno = ERRNO_DATA4XX;
3868 addrlist->more_errno |= ((sx.buffer[1] - '0')*10 + sx.buffer[2] - '0') << 8;
3872 /* For LMTP, we get back a response for every RCPT command that we sent;
3873 some may be accepted and some rejected. For those that get a response, their
3874 status is fixed; any that are accepted have been handed over, even if later
3875 responses crash - at least, that's how I read RFC 2033.
3877 If all went well, mark the recipient addresses as completed, record which
3878 host/IPaddress they were delivered to, and cut out RSET when sending another
3879 message down the same channel. Write the completed addresses to the journal
3880 now so that they are recorded in case there is a crash of hardware or
3881 software before the spool gets updated. Also record the final SMTP
3882 confirmation if needed (for SMTP only). */
3887 struct timeval delivery_time;
3889 uschar * conf = NULL;
3891 timesince(&delivery_time, &start_delivery_time);
3892 sx.send_rset = FALSE;
3893 pipelining_active = FALSE;
3895 /* Set up confirmation if needed - applies only to SMTP */
3898 #ifdef DISABLE_EVENT
3899 LOGGING(smtp_confirmation) &&
3904 const uschar *s = string_printing(sx.buffer);
3905 /* deconst cast ok here as string_printing was checked to have alloc'n'copied */
3906 conf = (s == sx.buffer)? US string_copy(s) : US s;
3909 /* Process all transported addresses - for LMTP or PRDR, read a status for
3912 for (address_item * addr = addrlist; addr != sx.first_addr; addr = addr->next)
3914 if (addr->transport_return != PENDING_OK) continue;
3916 /* LMTP - if the response fails badly (e.g. timeout), use it for all the
3917 remaining addresses. Otherwise, it's a return code for just the one
3918 address. For temporary errors, add a retry item for the address so that
3919 it doesn't get tried again too soon. */
3921 #ifndef DISABLE_PRDR
3922 if (sx.lmtp || sx.prdr_active)
3927 if (!smtp_read_response(&sx, sx.buffer, sizeof(sx.buffer), '2',
3930 if (errno != 0 || sx.buffer[0] == 0) goto RESPONSE_FAILED;
3931 addr->message = string_sprintf(
3932 #ifndef DISABLE_PRDR
3933 "%s error after %s: %s", sx.prdr_active ? "PRDR":"LMTP",
3935 "LMTP error after %s: %s",
3937 data_command, string_printing(sx.buffer));
3938 setflag(addr, af_pass_message); /* Allow message to go to user */
3939 if (sx.buffer[0] == '5')
3940 addr->transport_return = FAIL;
3943 errno = ERRNO_DATA4XX;
3944 addr->more_errno |= ((sx.buffer[1] - '0')*10 + sx.buffer[2] - '0') << 8;
3945 addr->transport_return = DEFER;
3946 #ifndef DISABLE_PRDR
3947 if (!sx.prdr_active)
3949 retry_add_item(addr, addr->address_retry_key, 0);
3953 sx.completed_addr = TRUE; /* NOW we can set this flag */
3954 if (LOGGING(smtp_confirmation))
3956 const uschar *s = string_printing(sx.buffer);
3957 /* deconst cast ok here as string_printing was checked to have alloc'n'copied */
3958 conf = (s == sx.buffer) ? US string_copy(s) : US s;
3962 /* SMTP, or success return from LMTP for this address. Pass back the
3963 actual host that was used. */
3965 addr->transport_return = OK;
3966 addr->more_errno = delivery_time.tv_sec;
3967 addr->delivery_usec = delivery_time.tv_usec;
3968 addr->host_used = host;
3969 addr->special_action = flag;
3970 addr->message = conf;
3972 if (tcp_out_fastopen)
3974 setflag(addr, af_tcp_fastopen_conn);
3975 if (tcp_out_fastopen >= TFO_USED_NODATA) setflag(addr, af_tcp_fastopen);
3976 if (tcp_out_fastopen >= TFO_USED_DATA) setflag(addr, af_tcp_fastopen_data);
3978 if (sx.pipelining_used) setflag(addr, af_pipelining);
3979 #ifndef DISABLE_PIPE_CONNECT
3980 if (sx.early_pipe_active) setflag(addr, af_early_pipe);
3982 #ifndef DISABLE_PRDR
3983 if (sx.prdr_active) setflag(addr, af_prdr_used);
3985 if (sx.peer_offered & OPTION_CHUNKING) setflag(addr, af_chunking_used);
3988 #ifndef DISABLE_PRDR
3989 if (!sx.prdr_active)
3992 /* Update the journal. For homonymic addresses, use the base address plus
3993 the transport name. See lots of comments in deliver.c about the reasons
3994 for the complications when homonyms are involved. Just carry on after
3995 write error, as it may prove possible to update the spool file later. */
3997 if (testflag(addr, af_homonym))
3998 sprintf(CS sx.buffer, "%.500s/%s\n", addr->unique + 3, tblock->name);
4000 sprintf(CS sx.buffer, "%.500s\n", addr->unique);
4002 DEBUG(D_deliver) debug_printf("S:journalling %s\n", sx.buffer);
4003 len = Ustrlen(CS sx.buffer);
4004 if (write(journal_fd, sx.buffer, len) != len)
4005 log_write(0, LOG_MAIN|LOG_PANIC, "failed to write journal for "
4006 "%s: %s", sx.buffer, strerror(errno));
4010 #ifndef DISABLE_PRDR
4013 const uschar * overall_message;
4015 /* PRDR - get the final, overall response. For any non-success
4016 upgrade all the address statuses. */
4018 sx.ok = smtp_read_response(&sx, sx.buffer, sizeof(sx.buffer), '2',
4022 if(errno == 0 && sx.buffer[0] == '4')
4024 errno = ERRNO_DATA4XX;
4025 addrlist->more_errno |= ((sx.buffer[1] - '0')*10 + sx.buffer[2] - '0') << 8;
4027 for (address_item * addr = addrlist; addr != sx.first_addr; addr = addr->next)
4028 if (sx.buffer[0] == '5' || addr->transport_return == OK)
4029 addr->transport_return = PENDING_OK; /* allow set_errno action */
4030 goto RESPONSE_FAILED;
4033 /* Append the overall response to the individual PRDR response for logging
4034 and update the journal, or setup retry. */
4036 overall_message = string_printing(sx.buffer);
4037 for (address_item * addr = addrlist; addr != sx.first_addr; addr = addr->next)
4038 if (addr->transport_return == OK)
4039 addr->message = string_sprintf("%s\\n%s", addr->message, overall_message);
4041 for (address_item * addr = addrlist; addr != sx.first_addr; addr = addr->next)
4042 if (addr->transport_return == OK)
4044 if (testflag(addr, af_homonym))
4045 sprintf(CS sx.buffer, "%.500s/%s\n", addr->unique + 3, tblock->name);
4047 sprintf(CS sx.buffer, "%.500s\n", addr->unique);
4049 DEBUG(D_deliver) debug_printf("journalling(PRDR) %s\n", sx.buffer);
4050 len = Ustrlen(CS sx.buffer);
4051 if (write(journal_fd, sx.buffer, len) != len)
4052 log_write(0, LOG_MAIN|LOG_PANIC, "failed to write journal for "
4053 "%s: %s", sx.buffer, strerror(errno));
4055 else if (addr->transport_return == DEFER)
4056 retry_add_item(addr, addr->address_retry_key, -2);
4060 /* Ensure the journal file is pushed out to disk. */
4062 if (EXIMfsync(journal_fd) < 0)
4063 log_write(0, LOG_MAIN|LOG_PANIC, "failed to fsync journal: %s",
4069 /* Handle general (not specific to one address) failures here. The value of ok
4070 is used to skip over this code on the falling through case. A timeout causes a
4071 deferral. Other errors may defer or fail according to the response code, and
4072 may set up a special errno value, e.g. after connection chopped, which is
4073 assumed if errno == 0 and there is no text in the buffer. If control reaches
4074 here during the setting up phase (i.e. before MAIL FROM) then always defer, as
4075 the problem is not related to this specific message. */
4080 uschar * set_message;
4086 sx.send_quit = check_response(host, &save_errno, addrlist->more_errno,
4087 sx.buffer, &code, &message, &pass_message);
4095 message = string_sprintf("send() to %s [%s] failed: %s",
4096 host->name, host->address, message ? message : US strerror(save_errno));
4097 sx.send_quit = FALSE;
4105 sx.ok = FALSE; /* For when reached by GOTO */
4106 set_message = message;
4108 /* We want to handle timeouts after MAIL or "." and loss of connection after
4109 "." specially. They can indicate a problem with the sender address or with
4110 the contents of the message rather than a real error on the connection. These
4111 cases are treated in the same way as a 4xx response. This next bit of code
4112 does the classification. */
4119 message_error = TRUE;
4123 message_error = Ustrncmp(smtp_command,"MAIL",4) == 0 ||
4124 Ustrncmp(smtp_command,"end ",4) == 0;
4127 case ERRNO_SMTPCLOSED:
4128 message_error = Ustrncmp(smtp_command,"end ",4) == 0;
4132 message_error = FALSE;
4136 /* Handle the cases that are treated as message errors. These are:
4138 (a) negative response or timeout after MAIL
4139 (b) negative response after DATA
4140 (c) negative response or timeout or dropped connection after "."
4141 (d) utf8 support required and not offered
4143 It won't be a negative response or timeout after RCPT, as that is dealt
4144 with separately above. The action in all cases is to set an appropriate
4145 error code for all the addresses, but to leave yield set to OK because the
4146 host itself has not failed. Of course, it might in practice have failed
4147 when we've had a timeout, but if so, we'll discover that at the next
4148 delivery attempt. For a temporary error, set the message_defer flag, and
4149 write to the logs for information if this is not the last host. The error
4150 for the last host will be logged as part of the address's log line. */
4154 if (mua_wrapper) code = '5'; /* Force hard failure in wrapper mode */
4156 /* If there's an errno, the message contains just the identity of
4161 else /* Anything other than 5 is treated as temporary */
4165 message = US string_sprintf("%s: %s", message, strerror(save_errno));
4167 write_logs(host, message, sx.first_addr ? sx.first_addr->basic_errno : 0);
4169 *message_defer = TRUE;
4173 /* Otherwise, we have an I/O error or a timeout other than after MAIL or
4174 ".", or some other transportation error. We defer all addresses and yield
4175 DEFER, except for the case of failed add_headers expansion, or a transport
4176 filter failure, when the yield should be ERROR, to stop it trying other
4181 #ifndef DISABLE_PIPE_CONNECT
4182 /* If we were early-pipelinng and the actual EHLO response did not match
4183 the cached value we assumed, we could have detected it and passed a
4184 custom errno through to here. It would be nice to RSET and retry right
4185 away, but to reliably do that we eould need an extra synch point before
4186 we committed to data and that would discard half the gained roundrips.
4187 Or we could summarily drop the TCP connection. but that is also ugly.
4188 Instead, we ignore the possibility (having freshened the cache) and rely
4189 on the server telling us with a nonmessage error if we have tried to
4190 do something it no longer supports. */
4193 yield = (save_errno == ERRNO_CHHEADER_FAIL ||
4194 save_errno == ERRNO_FILTER_FAIL) ? ERROR : DEFER;
4198 set_errno(addrlist, save_errno, set_message, set_rc, pass_message, host
4199 #ifdef EXPERIMENTAL_DSN_INFO
4200 , sx.smtp_greeting, sx.helo_response
4206 /* If all has gone well, send_quit will be set TRUE, implying we can end the
4207 SMTP session tidily. However, if there were too many addresses to send in one
4208 message (indicated by first_addr being non-NULL) we want to carry on with the
4209 rest of them. Also, it is desirable to send more than one message down the SMTP
4210 connection if there are several waiting, provided we haven't already sent so
4211 many as to hit the configured limit. The function transport_check_waiting looks
4212 for a waiting message and returns its id. Then transport_pass_socket tries to
4213 set up a continued delivery by passing the socket on to another process. The
4214 variable send_rset is FALSE if a message has just been successfully transferred.
4216 If we are already sending down a continued channel, there may be further
4217 addresses not yet delivered that are aimed at the same host, but which have not
4218 been passed in this run of the transport. In this case, continue_more will be
4219 true, and all we should do is send RSET if necessary, and return, leaving the
4222 However, if no address was disposed of, i.e. all addresses got 4xx errors, we
4223 do not want to continue with other messages down the same channel, because that
4224 can lead to looping between two or more messages, all with the same,
4225 temporarily failing address(es). [The retry information isn't updated yet, so
4226 new processes keep on trying.] We probably also don't want to try more of this
4227 message's addresses either.
4229 If we have started a TLS session, we have to end it before passing the
4230 connection to a new process. However, not all servers can handle this (Exim
4231 can), so we do not pass such a connection on if the host matches
4232 hosts_nopass_tls. */
4235 debug_printf("ok=%d send_quit=%d send_rset=%d continue_more=%d "
4236 "yield=%d first_address is %sNULL\n", sx.ok, sx.send_quit,
4237 sx.send_rset, f.continue_more, yield, sx.first_addr ? "not " : "");
4239 if (sx.completed_addr && sx.ok && sx.send_quit)
4242 smtp_compare_t t_compare;
4244 t_compare.tblock = tblock;
4245 t_compare.current_sender_address = sender_address;
4247 if ( sx.first_addr != NULL
4251 ( tls_out.active.sock < 0 && !continue_proxy_cipher
4252 || verify_check_given_host(CUSS &ob->hosts_nopass_tls, host) != OK
4256 transport_check_waiting(tblock->name, host->name,
4257 tblock->connection_max_messages, new_message_id, &more,
4258 (oicf)smtp_are_same_identities, (void*)&t_compare)
4265 if (! (sx.ok = smtp_write_command(&sx, SCMD_FLUSH, "RSET\r\n") >= 0))
4267 msg = US string_sprintf("send() to %s [%s] failed: %s", host->name,
4268 host->address, strerror(errno));
4269 sx.send_quit = FALSE;
4271 else if (! (sx.ok = smtp_read_response(&sx, sx.buffer, sizeof(sx.buffer),
4272 '2', ob->command_timeout)))
4275 sx.send_quit = check_response(host, &errno, 0, sx.buffer, &code, &msg,
4279 DEBUG(D_transport) debug_printf("H=%s [%s] %s\n",
4280 host->name, host->address, msg);
4284 /* Either RSET was not needed, or it succeeded */
4291 int socket_fd = sx.cctx.sock;
4294 if (sx.first_addr != NULL) /* More addresses still to be sent */
4295 { /* in this run of the transport */
4296 continue_sequence++; /* Causes * in logging */
4300 /* Unless caller said it already has more messages listed for this host,
4301 pass the connection on to a new Exim process (below, the call to
4302 transport_pass_socket). If the caller has more ready, just return with
4303 the connection still open. */
4306 if (tls_out.active.sock >= 0)
4307 if ( f.continue_more
4308 || verify_check_given_host(CUSS &ob->hosts_noproxy_tls, host) == OK)
4310 /* Before passing the socket on, or returning to caller with it still
4311 open, we must shut down TLS. Not all MTAs allow for the continuation
4312 of the SMTP session when TLS is shut down. We test for this by sending
4313 a new EHLO. If we don't get a good response, we don't attempt to pass
4316 tls_close(sx.cctx.tls_ctx, TLS_SHUTDOWN_WAIT);
4317 sx.cctx.tls_ctx = NULL;
4318 smtp_peer_options = smtp_peer_options_wrap;
4320 && smtp_write_command(&sx, SCMD_FLUSH, "EHLO %s\r\n", sx.helo_data)
4322 && smtp_read_response(&sx, sx.buffer, sizeof(sx.buffer),
4323 '2', ob->command_timeout);
4325 if (sx.ok && f.continue_more)
4326 return yield; /* More addresses for another run */
4330 /* Set up a pipe for proxying TLS for the new transport process */
4332 smtp_peer_options |= OPTION_TLS;
4333 if ((sx.ok = socketpair(AF_UNIX, SOCK_STREAM, 0, pfd) == 0))
4336 set_errno(sx.first_addr, errno, US"internal allocation problem",
4338 # ifdef EXPERIMENTAL_DSN_INFO
4339 , sx.smtp_greeting, sx.helo_response
4345 if (f.continue_more)
4346 return yield; /* More addresses for another run */
4348 /* If the socket is successfully passed, we mustn't send QUIT (or
4349 indeed anything!) from here. */
4351 /*XXX DSN_INFO: assume likely to do new HELO; but for greet we'll want to
4352 propagate it from the initial
4354 if (sx.ok && transport_pass_socket(tblock->name, host->name,
4355 host->address, new_message_id, socket_fd))
4357 sx.send_quit = FALSE;
4359 /* We have passed the client socket to a fresh transport process.
4360 If TLS is still active, we need to proxy it for the transport we
4361 just passed the baton to. Fork a child to to do it, and return to
4362 get logging done asap. Which way to place the work makes assumptions
4363 about post-fork prioritisation which may not hold on all platforms. */
4365 if (tls_out.active.sock >= 0)
4368 if (pid == 0) /* child; fork again to disconnect totally */
4370 testharness_pause_ms(100); /* let parent debug out */
4371 /* does not return */
4372 smtp_proxy_tls(sx.cctx.tls_ctx, sx.buffer, sizeof(sx.buffer), pfd,
4373 ob->command_timeout);
4376 if (pid > 0) /* parent */
4378 DEBUG(D_transport) debug_printf("proxy-proc inter-pid %d\n", pid);
4380 /* tidy the inter-proc to disconn the proxy proc */
4381 waitpid(pid, NULL, 0);
4382 tls_close(sx.cctx.tls_ctx, TLS_NO_SHUTDOWN);
4383 sx.cctx.tls_ctx = NULL;
4384 (void)close(sx.cctx.sock);
4386 continue_transport = NULL;
4387 continue_hostname = NULL;
4390 log_write(0, LOG_PANIC_DIE, "fork failed");
4396 /* If RSET failed and there are addresses left, they get deferred. */
4398 set_errno(sx.first_addr, errno, msg, DEFER, FALSE, host
4399 #ifdef EXPERIMENTAL_DSN_INFO
4400 , sx.smtp_greeting, sx.helo_response
4406 /* End off tidily with QUIT unless the connection has died or the socket has
4407 been passed to another process. There has been discussion on the net about what
4408 to do after sending QUIT. The wording of the RFC suggests that it is necessary
4409 to wait for a response, but on the other hand, there isn't anything one can do
4410 with an error response, other than log it. Exim used to do that. However,
4411 further discussion suggested that it is positively advantageous not to wait for
4412 the response, but to close the session immediately. This is supposed to move
4413 the TCP/IP TIME_WAIT state from the server to the client, thereby removing some
4414 load from the server. (Hosts that are both servers and clients may not see much
4415 difference, of course.) Further discussion indicated that this was safe to do
4416 on Unix systems which have decent implementations of TCP/IP that leave the
4417 connection around for a while (TIME_WAIT) after the application has gone away.
4418 This enables the response sent by the server to be properly ACKed rather than
4419 timed out, as can happen on broken TCP/IP implementations on other OS.
4421 This change is being made on 31-Jul-98. After over a year of trouble-free
4422 operation, the old commented-out code was removed on 17-Sep-99. */
4426 (void) setsockopt(sx.cctx.sock, IPPROTO_TCP, TCP_CORK, US &on, sizeof(on));
4428 if (sx.send_quit) (void)smtp_write_command(&sx, SCMD_FLUSH, "QUIT\r\n");
4433 tls_close(sx.cctx.tls_ctx, TLS_SHUTDOWN_NOWAIT);
4434 sx.cctx.tls_ctx = NULL;
4437 /* Close the socket, and return the appropriate value, first setting
4438 works because the NULL setting is passed back to the calling process, and
4439 remote_max_parallel is forced to 1 when delivering over an existing connection,
4441 If all went well and continue_more is set, we shouldn't actually get here if
4442 there are further addresses, as the return above will be taken. However,
4443 writing RSET might have failed, or there may be other addresses whose hosts are
4444 specified in the transports, and therefore not visible at top level, in which
4445 case continue_more won't get set. */
4447 HDEBUG(D_transport|D_acl|D_v) debug_printf_indent(" SMTP(close)>>\n");
4450 shutdown(sx.cctx.sock, SHUT_WR);
4452 testharness_pause_ms(200);
4453 if (fcntl(sx.cctx.sock, F_SETFL, O_NONBLOCK) == 0)
4454 for (int i = 16; read(sx.cctx.sock, sx.inbuffer, sizeof(sx.inbuffer)) > 0 && i > 0;)
4455 i--; /* drain socket */
4457 (void)close(sx.cctx.sock);
4459 #ifndef DISABLE_EVENT
4460 (void) event_raise(tblock->event_action, US"tcp:close", NULL);
4463 continue_transport = NULL;
4464 continue_hostname = NULL;
4471 /*************************************************
4472 * Closedown entry point *
4473 *************************************************/
4475 /* This function is called when exim is passed an open smtp channel
4476 from another incarnation, but the message which it has been asked
4477 to deliver no longer exists. The channel is on stdin.
4479 We might do fancy things like looking for another message to send down
4480 the channel, but if the one we sought has gone, it has probably been
4481 delivered by some other process that itself will seek further messages,
4482 so just close down our connection.
4484 Argument: pointer to the transport instance block
4489 smtp_transport_closedown(transport_instance *tblock)
4491 smtp_transport_options_block * ob = SOB tblock->options_block;
4492 client_conn_ctx cctx;
4495 uschar inbuffer[4096];
4496 uschar outbuffer[16];
4498 /*XXX really we need an active-smtp-client ctx, rather than assuming stdout */
4499 cctx.sock = fileno(stdin);
4500 cctx.tls_ctx = cctx.sock == tls_out.active.sock ? tls_out.active.tls_ctx : NULL;
4502 sx.inblock.cctx = &cctx;
4503 sx.inblock.buffer = inbuffer;
4504 sx.inblock.buffersize = sizeof(inbuffer);
4505 sx.inblock.ptr = inbuffer;
4506 sx.inblock.ptrend = inbuffer;
4508 sx.outblock.cctx = &cctx;
4509 sx.outblock.buffersize = sizeof(outbuffer);
4510 sx.outblock.buffer = outbuffer;
4511 sx.outblock.ptr = outbuffer;
4512 sx.outblock.cmd_count = 0;
4513 sx.outblock.authenticating = FALSE;
4515 (void)smtp_write_command(&sx, SCMD_FLUSH, "QUIT\r\n");
4516 (void)smtp_read_response(&sx, buffer, sizeof(buffer), '2', ob->command_timeout);
4517 (void)close(cctx.sock);
4522 /*************************************************
4523 * Prepare addresses for delivery *
4524 *************************************************/
4526 /* This function is called to flush out error settings from previous delivery
4527 attempts to other hosts. It also records whether we got here via an MX record
4528 or not in the more_errno field of the address. We are interested only in
4529 addresses that are still marked DEFER - others may have got delivered to a
4530 previously considered IP address. Set their status to PENDING_DEFER to indicate
4531 which ones are relevant this time.
4534 addrlist the list of addresses
4535 host the host we are delivering to
4537 Returns: the first address for this delivery
4540 static address_item *
4541 prepare_addresses(address_item *addrlist, host_item *host)
4543 address_item *first_addr = NULL;
4544 for (address_item * addr = addrlist; addr; addr = addr->next)
4545 if (addr->transport_return == DEFER)
4547 if (!first_addr) first_addr = addr;
4548 addr->transport_return = PENDING_DEFER;
4549 addr->basic_errno = 0;
4550 addr->more_errno = (host->mx >= 0)? 'M' : 'A';
4551 addr->message = NULL;
4553 addr->cipher = NULL;
4554 addr->ourcert = NULL;
4555 addr->peercert = NULL;
4556 addr->peerdn = NULL;
4557 addr->ocsp = OCSP_NOT_REQ;
4559 #ifdef EXPERIMENTAL_DSN_INFO
4560 addr->smtp_greeting = NULL;
4561 addr->helo_response = NULL;
4569 /*************************************************
4570 * Main entry point *
4571 *************************************************/
4573 /* See local README for interface details. As this is a remote transport, it is
4574 given a chain of addresses to be delivered in one connection, if possible. It
4575 always returns TRUE, indicating that each address has its own independent
4576 status set, except if there is a setting up problem, in which case it returns
4580 smtp_transport_entry(
4581 transport_instance *tblock, /* data for this instantiation */
4582 address_item *addrlist) /* addresses we are working on */
4585 int hosts_defer = 0;
4587 int hosts_looked_up = 0;
4588 int hosts_retry = 0;
4589 int hosts_serial = 0;
4590 int hosts_total = 0;
4591 int total_hosts_tried = 0;
4592 BOOL expired = TRUE;
4593 uschar *expanded_hosts = NULL;
4595 uschar *tid = string_sprintf("%s transport", tblock->name);
4596 smtp_transport_options_block *ob = SOB tblock->options_block;
4597 host_item *hostlist = addrlist->host_list;
4598 host_item *host = NULL;
4602 debug_printf("%s transport entered\n", tblock->name);
4603 for (address_item * addr = addrlist; addr; addr = addr->next)
4604 debug_printf(" %s\n", addr->address);
4607 debug_printf("hostlist:\n");
4608 for (host_item * host = hostlist; host; host = host->next)
4609 debug_printf(" '%s' IP %s port %d\n", host->name, host->address, host->port);
4611 if (continue_hostname)
4612 debug_printf("already connected to %s [%s] (on fd %d)\n",
4613 continue_hostname, continue_host_address,
4614 cutthrough.cctx.sock >= 0 ? cutthrough.cctx.sock : 0);
4617 /* Set the flag requesting that these hosts be added to the waiting
4618 database if the delivery fails temporarily or if we are running with
4619 queue_smtp or a 2-stage queue run. This gets unset for certain
4620 kinds of error, typically those that are specific to the message. */
4622 update_waiting = TRUE;
4624 /* If a host list is not defined for the addresses - they must all have the
4625 same one in order to be passed to a single transport - or if the transport has
4626 a host list with hosts_override set, use the host list supplied with the
4627 transport. It is an error for this not to exist. */
4629 if (!hostlist || (ob->hosts_override && ob->hosts))
4633 addrlist->message = string_sprintf("%s transport called with no hosts set",
4635 addrlist->transport_return = PANIC;
4636 return FALSE; /* Only top address has status */
4639 DEBUG(D_transport) debug_printf("using the transport's hosts: %s\n",
4642 /* If the transport's host list contains no '$' characters, and we are not
4643 randomizing, it is fixed and therefore a chain of hosts can be built once
4644 and for all, and remembered for subsequent use by other calls to this
4645 transport. If, on the other hand, the host list does contain '$', or we are
4646 randomizing its order, we have to rebuild it each time. In the fixed case,
4647 as the hosts string will never be used again, it doesn't matter that we
4648 replace all the : characters with zeros. */
4652 uschar *s = ob->hosts;
4654 if (Ustrchr(s, '$') != NULL)
4656 if (!(expanded_hosts = expand_string(s)))
4658 addrlist->message = string_sprintf("failed to expand list of hosts "
4659 "\"%s\" in %s transport: %s", s, tblock->name, expand_string_message);
4660 addrlist->transport_return = f.search_find_defer ? DEFER : PANIC;
4661 return FALSE; /* Only top address has status */
4663 DEBUG(D_transport) debug_printf("expanded list of hosts \"%s\" to "
4664 "\"%s\"\n", s, expanded_hosts);
4668 if (ob->hosts_randomize) s = expanded_hosts = string_copy(s);
4672 log_write(0, LOG_MAIN|LOG_PANIC,
4673 "attempt to use tainted host list '%s' from '%s' in transport %s",
4674 s, ob->hosts, tblock->name);
4675 /* Avoid leaking info to an attacker */
4676 addrlist->message = US"internal configuration error";
4677 addrlist->transport_return = PANIC;
4681 host_build_hostlist(&hostlist, s, ob->hosts_randomize);
4683 /* Check that the expansion yielded something useful. */
4687 string_sprintf("%s transport has empty hosts setting", tblock->name);
4688 addrlist->transport_return = PANIC;
4689 return FALSE; /* Only top address has status */
4692 /* If there was no expansion of hosts, save the host list for
4695 if (!expanded_hosts) ob->hostlist = hostlist;
4698 /* This is not the first time this transport has been run in this delivery;
4699 the host list was built previously. */
4702 hostlist = ob->hostlist;
4705 /* The host list was supplied with the address. If hosts_randomize is set, we
4706 must sort it into a random order if it did not come from MX records and has not
4707 already been randomized (but don't bother if continuing down an existing
4710 else if (ob->hosts_randomize && hostlist->mx == MX_NONE && !continue_hostname)
4712 host_item *newlist = NULL;
4715 host_item *h = hostlist;
4716 hostlist = hostlist->next;
4718 h->sort_key = random_number(100);
4725 else if (h->sort_key < newlist->sort_key)
4732 host_item *hh = newlist;
4735 if (h->sort_key < hh->next->sort_key) break;
4743 hostlist = addrlist->host_list = newlist;
4746 /* Sort out the default port. */
4748 if (!smtp_get_port(ob->port, addrlist, &defport, tid)) return FALSE;
4750 /* For each host-plus-IP-address on the list:
4752 . If this is a continued delivery and the host isn't the one with the
4753 current connection, skip.
4755 . If the status is unusable (i.e. previously failed or retry checked), skip.
4757 . If no IP address set, get the address, either by turning the name into
4758 an address, calling gethostbyname if gethostbyname is on, or by calling
4759 the DNS. The DNS may yield multiple addresses, in which case insert the
4760 extra ones into the list.
4762 . Get the retry data if not previously obtained for this address and set the
4763 field which remembers the state of this address. Skip if the retry time is
4764 not reached. If not, remember whether retry data was found. The retry string
4765 contains both the name and the IP address.
4767 . Scan the list of addresses and mark those whose status is DEFER as
4768 PENDING_DEFER. These are the only ones that will be processed in this cycle
4771 . Make a delivery attempt - addresses marked PENDING_DEFER will be tried.
4772 Some addresses may be successfully delivered, others may fail, and yet
4773 others may get temporary errors and so get marked DEFER.
4775 . The return from the delivery attempt is OK if a connection was made and a
4776 valid SMTP dialogue was completed. Otherwise it is DEFER.
4778 . If OK, add a "remove" retry item for this host/IPaddress, if any.
4780 . If fail to connect, or other defer state, add a retry item.
4782 . If there are any addresses whose status is still DEFER, carry on to the
4783 next host/IPaddress, unless we have tried the number of hosts given
4784 by hosts_max_try or hosts_max_try_hardlimit; otherwise return. Note that
4785 there is some fancy logic for hosts_max_try that means its limit can be
4786 overstepped in some circumstances.
4788 If we get to the end of the list, all hosts have deferred at least one address,
4789 or not reached their retry times. If delay_after_cutoff is unset, it requests a
4790 delivery attempt to those hosts whose last try was before the arrival time of
4791 the current message. To cope with this, we have to go round the loop a second
4792 time. After that, set the status and error data for any addresses that haven't
4793 had it set already. */
4795 for (int cutoff_retry = 0;
4796 expired && cutoff_retry < (ob->delay_after_cutoff ? 1 : 2);
4799 host_item *nexthost = NULL;
4800 int unexpired_hosts_tried = 0;
4801 BOOL continue_host_tried = FALSE;
4803 retry_non_continued:
4804 for (host = hostlist;
4806 && unexpired_hosts_tried < ob->hosts_max_try
4807 && total_hosts_tried < ob->hosts_max_try_hardlimit;
4812 BOOL host_is_expired = FALSE;
4813 BOOL message_defer = FALSE;
4814 BOOL some_deferred = FALSE;
4815 address_item *first_addr = NULL;
4816 uschar *interface = NULL;
4817 uschar *retry_host_key = NULL;
4818 uschar *retry_message_key = NULL;
4819 uschar *serialize_key = NULL;
4821 /* Default next host is next host. :-) But this can vary if the
4822 hosts_max_try limit is hit (see below). It may also be reset if a host
4823 address is looked up here (in case the host was multihomed). */
4825 nexthost = host->next;
4827 /* If the address hasn't yet been obtained from the host name, look it up
4828 now, unless the host is already marked as unusable. If it is marked as
4829 unusable, it means that the router was unable to find its IP address (in
4830 the DNS or wherever) OR we are in the 2nd time round the cutoff loop, and
4831 the lookup failed last time. We don't get this far if *all* MX records
4832 point to non-existent hosts; that is treated as a hard error.
4834 We can just skip this host entirely. When the hosts came from the router,
4835 the address will timeout based on the other host(s); when the address is
4836 looked up below, there is an explicit retry record added.
4838 Note that we mustn't skip unusable hosts if the address is not unset; they
4839 may be needed as expired hosts on the 2nd time round the cutoff loop. */
4843 int new_port, flags;
4845 if (host->status >= hstatus_unusable)
4847 DEBUG(D_transport) debug_printf("%s has no address and is unusable - skipping\n",
4852 DEBUG(D_transport) debug_printf("getting address for %s\n", host->name);
4854 /* The host name is permitted to have an attached port. Find it, and
4855 strip it from the name. Just remember it for now. */
4857 new_port = host_item_get_port(host);
4859 /* Count hosts looked up */
4863 /* Find by name if so configured, or if it's an IP address. We don't
4864 just copy the IP address, because we need the test-for-local to happen. */
4866 flags = HOST_FIND_BY_A | HOST_FIND_BY_AAAA;
4867 if (ob->dns_qualify_single) flags |= HOST_FIND_QUALIFY_SINGLE;
4868 if (ob->dns_search_parents) flags |= HOST_FIND_SEARCH_PARENTS;
4870 if (ob->gethostbyname || string_is_ip_address(host->name, NULL) != 0)
4871 rc = host_find_byname(host, NULL, flags, NULL, TRUE);
4873 rc = host_find_bydns(host, NULL, flags, NULL, NULL, NULL,
4874 &ob->dnssec, /* domains for request/require */
4877 /* Update the host (and any additional blocks, resulting from
4878 multihoming) with a host-specific port, if any. */
4880 for (host_item * hh = host; hh != nexthost; hh = hh->next) hh->port = new_port;
4882 /* Failure to find the host at this time (usually DNS temporary failure)
4883 is really a kind of routing failure rather than a transport failure.
4884 Therefore we add a retry item of the routing kind, not to stop us trying
4885 to look this name up here again, but to ensure the address gets timed
4886 out if the failures go on long enough. A complete failure at this point
4887 commonly points to a configuration error, but the best action is still
4888 to carry on for the next host. */
4890 if (rc == HOST_FIND_AGAIN || rc == HOST_FIND_SECURITY || rc == HOST_FIND_FAILED)
4892 retry_add_item(addrlist, string_sprintf("R:%s", host->name), 0);
4894 if (rc == HOST_FIND_AGAIN) hosts_defer++; else hosts_fail++;
4895 DEBUG(D_transport) debug_printf("rc = %s for %s\n", (rc == HOST_FIND_AGAIN)?
4896 "HOST_FIND_AGAIN" : "HOST_FIND_FAILED", host->name);
4897 host->status = hstatus_unusable;
4899 for (address_item * addr = addrlist; addr; addr = addr->next)
4901 if (addr->transport_return != DEFER) continue;
4902 addr->basic_errno = ERRNO_UNKNOWNHOST;
4903 addr->message = string_sprintf(
4904 rc == HOST_FIND_SECURITY
4905 ? "lookup of IP address for %s was insecure"
4906 : "failed to lookup IP address for %s",
4912 /* If the host is actually the local host, we may have a problem, or
4913 there may be some cunning configuration going on. In the problem case,
4914 log things and give up. The default transport status is already DEFER. */
4916 if (rc == HOST_FOUND_LOCAL && !ob->allow_localhost)
4918 for (address_item * addr = addrlist; addr; addr = addr->next)
4920 addr->basic_errno = 0;
4921 addr->message = string_sprintf("%s transport found host %s to be "
4922 "local", tblock->name, host->name);
4926 } /* End of block for IP address lookup */
4928 /* If this is a continued delivery, we are interested only in the host
4929 which matches the name of the existing open channel. The check is put
4930 here after the local host lookup, in case the name gets expanded as a
4931 result of the lookup. Set expired FALSE, to save the outer loop executing
4934 if (continue_hostname)
4935 if ( Ustrcmp(continue_hostname, host->name) != 0
4936 || Ustrcmp(continue_host_address, host->address) != 0
4940 continue; /* With next host */
4943 continue_host_tried = TRUE;
4945 /* Reset the default next host in case a multihomed host whose addresses
4946 are not looked up till just above added to the host list. */
4948 nexthost = host->next;
4950 /* If queue_smtp is set (-odqs or the first part of a 2-stage run), or the
4951 domain is in queue_smtp_domains, we don't actually want to attempt any
4952 deliveries. When doing a queue run, queue_smtp_domains is always unset. If
4953 there is a lookup defer in queue_smtp_domains, proceed as if the domain
4954 were not in it. We don't want to hold up all SMTP deliveries! Except when
4955 doing a two-stage queue run, don't do this if forcing. */
4957 if ((!f.deliver_force || f.queue_2stage) && (f.queue_smtp ||
4958 match_isinlist(addrlist->domain,
4959 (const uschar **)&queue_smtp_domains, 0,
4960 &domainlist_anchor, NULL, MCL_DOMAIN, TRUE, NULL) == OK))
4963 for (address_item * addr = addrlist; addr; addr = addr->next)
4964 if (addr->transport_return == DEFER)
4965 addr->message = US"domain matches queue_smtp_domains, or -odqs set";
4966 continue; /* With next host */
4969 /* Count hosts being considered - purely for an intelligent comment
4970 if none are usable. */
4974 /* Set $host and $host address now in case they are needed for the
4975 interface expansion or the serialize_hosts check; they remain set if an
4976 actual delivery happens. */
4978 deliver_host = host->name;
4979 deliver_host_address = host->address;
4980 lookup_dnssec_authenticated = host->dnssec == DS_YES ? US"yes"
4981 : host->dnssec == DS_NO ? US"no"
4984 /* Set up a string for adding to the retry key if the port number is not
4985 the standard SMTP port. A host may have its own port setting that overrides
4988 pistring = string_sprintf(":%d", host->port == PORT_NONE
4989 ? defport : host->port);
4990 if (Ustrcmp(pistring, ":25") == 0) pistring = US"";
4992 /* Select IPv4 or IPv6, and choose an outgoing interface. If the interface
4993 string is set, even if constant (as different transports can have different
4994 constant settings), we must add it to the key that is used for retries,
4995 because connections to the same host from a different interface should be
4996 treated separately. */
4998 host_af = Ustrchr(host->address, ':') == NULL ? AF_INET : AF_INET6;
5000 uschar * s = ob->interface;
5003 if (!smtp_get_interface(s, host_af, addrlist, &interface, tid))
5005 pistring = string_sprintf("%s/%s", pistring, interface);
5009 /* The first time round the outer loop, check the status of the host by
5010 inspecting the retry data. The second time round, we are interested only
5011 in expired hosts that haven't been tried since this message arrived. */
5013 if (cutoff_retry == 0)
5016 /* Ensure the status of the address is set by checking retry data if
5017 necessary. There may be host-specific retry data (applicable to all
5018 messages) and also data for retries of a specific message at this host.
5019 If either of these retry records are actually read, the keys used are
5020 returned to save recomputing them later. */
5022 if (exp_bool(addrlist, US"transport", tblock->name, D_transport,
5023 US"retry_include_ip_address", ob->retry_include_ip_address,
5024 ob->expand_retry_include_ip_address, &incl_ip) != OK)
5025 continue; /* with next host */
5027 host_is_expired = retry_check_address(addrlist->domain, host, pistring,
5028 incl_ip, &retry_host_key, &retry_message_key);
5030 DEBUG(D_transport) debug_printf("%s [%s]%s retry-status = %s\n", host->name,
5031 host->address ? host->address : US"", pistring,
5032 host->status == hstatus_usable ? "usable"
5033 : host->status == hstatus_unusable ? "unusable"
5034 : host->status == hstatus_unusable_expired ? "unusable (expired)" : "?");
5036 /* Skip this address if not usable at this time, noting if it wasn't
5037 actually expired, both locally and in the address. */
5039 switch (host->status)
5041 case hstatus_unusable:
5043 setflag(addrlist, af_retry_skipped);
5046 case hstatus_unusable_expired:
5049 case hwhy_retry: hosts_retry++; break;
5050 case hwhy_failed: hosts_fail++; break;
5052 case hwhy_deferred: hosts_defer++; break;
5055 /* If there was a retry message key, implying that previously there
5056 was a message-specific defer, we don't want to update the list of
5057 messages waiting for these hosts. */
5059 if (retry_message_key) update_waiting = FALSE;
5060 continue; /* With the next host or IP address */
5064 /* Second time round the loop: if the address is set but expired, and
5065 the message is newer than the last try, let it through. */
5070 || host->status != hstatus_unusable_expired
5071 || host->last_try > received_time.tv_sec)
5073 DEBUG(D_transport) debug_printf("trying expired host %s [%s]%s\n",
5074 host->name, host->address, pistring);
5075 host_is_expired = TRUE;
5078 /* Setting "expired=FALSE" doesn't actually mean not all hosts are expired;
5079 it remains TRUE only if all hosts are expired and none are actually tried.
5084 /* If this host is listed as one to which access must be serialized,
5085 see if another Exim process has a connection to it, and if so, skip
5086 this host. If not, update the database to record our connection to it
5087 and remember this for later deletion. Do not do any of this if we are
5088 sending the message down a pre-existing connection. */
5090 if ( !continue_hostname
5091 && verify_check_given_host(CUSS &ob->serialize_hosts, host) == OK)
5093 serialize_key = string_sprintf("host-serialize-%s", host->name);
5094 if (!enq_start(serialize_key, 1))
5097 debug_printf("skipping host %s because another Exim process "
5098 "is connected to it\n", host->name);
5104 /* OK, we have an IP address that is not waiting for its retry time to
5105 arrive (it might be expired) OR (second time round the loop) we have an
5106 expired host that hasn't been tried since the message arrived. Have a go
5107 at delivering the message to it. First prepare the addresses by flushing
5108 out the result of previous attempts, and finding the first address that
5109 is still to be delivered. */
5111 first_addr = prepare_addresses(addrlist, host);
5113 DEBUG(D_transport) debug_printf("delivering %s to %s [%s] (%s%s)\n",
5114 message_id, host->name, host->address, addrlist->address,
5115 addrlist->next ? ", ..." : "");
5117 set_process_info("delivering %s to %s [%s]%s (%s%s)",
5118 message_id, host->name, host->address, pistring, addrlist->address,
5119 addrlist->next ? ", ..." : "");
5121 /* This is not for real; don't do the delivery. If there are
5122 any remaining hosts, list them. */
5126 set_errno_nohost(addrlist, 0, NULL, OK, FALSE);
5127 for (address_item * addr = addrlist; addr; addr = addr->next)
5129 addr->host_used = host;
5130 addr->special_action = '*';
5131 addr->message = US"delivery bypassed by -N option";
5135 debug_printf("*** delivery by %s transport bypassed by -N option\n"
5136 "*** host and remaining hosts:\n", tblock->name);
5137 for (host_item * host2 = host; host2; host2 = host2->next)
5138 debug_printf(" %s [%s]\n", host2->name,
5139 host2->address ? host2->address : US"unset");
5144 /* This is for real. If the host is expired, we don't count it for
5145 hosts_max_retry. This ensures that all hosts must expire before an address
5146 is timed out, unless hosts_max_try_hardlimit (which protects against
5147 lunatic DNS configurations) is reached.
5149 If the host is not expired and we are about to hit the hosts_max_retry
5150 limit, check to see if there is a subsequent hosts with a different MX
5151 value. If so, make that the next host, and don't count this one. This is a
5152 heuristic to make sure that different MXs do get tried. With a normal kind
5153 of retry rule, they would get tried anyway when the earlier hosts were
5154 delayed, but if the domain has a "retry every time" type of rule - as is
5155 often used for the the very large ISPs, that won't happen. */
5160 /* Make a copy of the host if it is local to this invocation
5161 of the transport. */
5165 thost = store_get(sizeof(host_item), FALSE);
5167 thost->name = string_copy(host->name);
5168 thost->address = string_copy(host->address);
5173 if (!host_is_expired && ++unexpired_hosts_tried >= ob->hosts_max_try)
5176 debug_printf("hosts_max_try limit reached with this host\n");
5177 for (host_item * h = host; h; h = h->next) if (h->mx != host->mx)
5180 unexpired_hosts_tried--;
5181 DEBUG(D_transport) debug_printf("however, a higher MX host exists "
5182 "and will be tried\n");
5187 /* Attempt the delivery. */
5189 total_hosts_tried++;
5190 rc = smtp_deliver(addrlist, thost, host_af, defport, interface, tblock,
5191 &message_defer, FALSE);
5194 OK => connection made, each address contains its result;
5195 message_defer is set for message-specific defers (when all
5196 recipients are marked defer)
5197 DEFER => there was a non-message-specific delivery problem;
5198 ERROR => there was a problem setting up the arguments for a filter,
5199 or there was a problem with expanding added headers
5202 /* If the result is not OK, there was a non-message-specific problem.
5203 If the result is DEFER, we need to write to the logs saying what happened
5204 for this particular host, except in the case of authentication and TLS
5205 failures, where the log has already been written. If all hosts defer a
5206 general message is written at the end. */
5208 if (rc == DEFER && first_addr->basic_errno != ERRNO_AUTHFAIL
5209 && first_addr->basic_errno != ERRNO_TLSFAILURE)
5210 write_logs(host, first_addr->message, first_addr->basic_errno);
5212 #ifndef DISABLE_EVENT
5214 deferred_event_raise(first_addr, host);
5217 /* If STARTTLS was accepted, but there was a failure in setting up the
5218 TLS session (usually a certificate screwup), and the host is not in
5219 hosts_require_tls, and tls_tempfail_tryclear is true, try again, with
5220 TLS forcibly turned off. We have to start from scratch with a new SMTP
5221 connection. That's why the retry is done from here, not from within
5222 smtp_deliver(). [Rejections of STARTTLS itself don't screw up the
5223 session, so the in-clear transmission after those errors, if permitted,
5224 happens inside smtp_deliver().] */
5228 && first_addr->basic_errno == ERRNO_TLSFAILURE
5229 && ob->tls_tempfail_tryclear
5230 && verify_check_given_host(CUSS &ob->hosts_require_tls, host) != OK
5233 log_write(0, LOG_MAIN,
5234 "%s: delivering unencrypted to H=%s [%s] (not in hosts_require_tls)",
5235 first_addr->message, host->name, host->address);
5236 first_addr = prepare_addresses(addrlist, host);
5237 rc = smtp_deliver(addrlist, thost, host_af, defport, interface, tblock,
5238 &message_defer, TRUE);
5239 if (rc == DEFER && first_addr->basic_errno != ERRNO_AUTHFAIL)
5240 write_logs(host, first_addr->message, first_addr->basic_errno);
5241 # ifndef DISABLE_EVENT
5243 deferred_event_raise(first_addr, host);
5246 #endif /*DISABLE_TLS*/
5249 /* Delivery attempt finished */
5251 set_process_info("delivering %s: just tried %s [%s]%s for %s%s: result %s",
5252 message_id, host->name, host->address, pistring, addrlist->address,
5253 addrlist->next ? " (& others)" : "", rc_to_string(rc));
5255 /* Release serialization if set up */
5257 if (serialize_key) enq_end(serialize_key);
5259 /* If the result is DEFER, or if a host retry record is known to exist, we
5260 need to add an item to the retry chain for updating the retry database
5261 at the end of delivery. We only need to add the item to the top address,
5262 of course. Also, if DEFER, we mark the IP address unusable so as to skip it
5263 for any other delivery attempts using the same address. (It is copied into
5264 the unusable tree at the outer level, so even if different address blocks
5265 contain the same address, it still won't get tried again.) */
5267 if (rc == DEFER || retry_host_key)
5269 int delete_flag = rc != DEFER ? rf_delete : 0;
5270 if (!retry_host_key)
5273 if (exp_bool(addrlist, US"transport", tblock->name, D_transport,
5274 US"retry_include_ip_address", ob->retry_include_ip_address,
5275 ob->expand_retry_include_ip_address, &incl_ip) != OK)
5276 incl_ip = TRUE; /* error; use most-specific retry record */
5278 retry_host_key = incl_ip
5279 ? string_sprintf("T:%S:%s%s", host->name, host->address, pistring)
5280 : string_sprintf("T:%S%s", host->name, pistring);
5283 /* If a delivery of another message over an existing SMTP connection
5284 yields DEFER, we do NOT set up retry data for the host. This covers the
5285 case when there are delays in routing the addresses in the second message
5286 that are so long that the server times out. This is alleviated by not
5287 routing addresses that previously had routing defers when handling an
5288 existing connection, but even so, this case may occur (e.g. if a
5289 previously happily routed address starts giving routing defers). If the
5290 host is genuinely down, another non-continued message delivery will
5291 notice it soon enough. */
5293 if (delete_flag != 0 || !continue_hostname)
5294 retry_add_item(first_addr, retry_host_key, rf_host | delete_flag);
5296 /* We may have tried an expired host, if its retry time has come; ensure
5297 the status reflects the expiry for the benefit of any other addresses. */
5301 host->status = host_is_expired
5302 ? hstatus_unusable_expired : hstatus_unusable;
5303 host->why = hwhy_deferred;
5307 /* If message_defer is set (host was OK, but every recipient got deferred
5308 because of some message-specific problem), or if that had happened
5309 previously so that a message retry key exists, add an appropriate item
5310 to the retry chain. Note that if there was a message defer but now there is
5311 a host defer, the message defer record gets deleted. That seems perfectly
5312 reasonable. Also, stop the message from being remembered as waiting
5313 for specific hosts. */
5315 if (message_defer || retry_message_key)
5317 int delete_flag = message_defer ? 0 : rf_delete;
5318 if (!retry_message_key)
5321 if (exp_bool(addrlist, US"transport", tblock->name, D_transport,
5322 US"retry_include_ip_address", ob->retry_include_ip_address,
5323 ob->expand_retry_include_ip_address, &incl_ip) != OK)
5324 incl_ip = TRUE; /* error; use most-specific retry record */
5326 retry_message_key = incl_ip
5327 ? string_sprintf("T:%S:%s%s:%s", host->name, host->address, pistring,
5329 : string_sprintf("T:%S%s:%s", host->name, pistring, message_id);
5331 retry_add_item(addrlist, retry_message_key,
5332 rf_message | rf_host | delete_flag);
5333 update_waiting = FALSE;
5336 /* Any return other than DEFER (that is, OK or ERROR) means that the
5337 addresses have got their final statuses filled in for this host. In the OK
5338 case, see if any of them are deferred. */
5341 for (address_item * addr = addrlist; addr; addr = addr->next)
5342 if (addr->transport_return == DEFER)
5344 some_deferred = TRUE;
5348 /* If no addresses deferred or the result was ERROR, return. We do this for
5349 ERROR because a failing filter set-up or add_headers expansion is likely to
5350 fail for any host we try. */
5352 if (rc == ERROR || (rc == OK && !some_deferred))
5354 DEBUG(D_transport) debug_printf("Leaving %s transport\n", tblock->name);
5355 return TRUE; /* Each address has its status */
5358 /* If the result was DEFER or some individual addresses deferred, let
5359 the loop run to try other hosts with the deferred addresses, except for the
5360 case when we were trying to deliver down an existing channel and failed.
5361 Don't try any other hosts in this case. */
5363 if (continue_hostname) break;
5365 /* If the whole delivery, or some individual addresses, were deferred and
5366 there are more hosts that could be tried, do not count this host towards
5367 the hosts_max_try limit if the age of the message is greater than the
5368 maximum retry time for this host. This means we may try try all hosts,
5369 ignoring the limit, when messages have been around for some time. This is
5370 important because if we don't try all hosts, the address will never time
5371 out. NOTE: this does not apply to hosts_max_try_hardlimit. */
5373 if ((rc == DEFER || some_deferred) && nexthost)
5376 retry_config *retry = retry_find_config(host->name, NULL, 0, 0);
5378 if (retry && retry->rules)
5380 retry_rule *last_rule;
5381 for (last_rule = retry->rules;
5383 last_rule = last_rule->next);
5384 timedout = time(NULL) - received_time.tv_sec > last_rule->timeout;
5386 else timedout = TRUE; /* No rule => timed out */
5390 unexpired_hosts_tried--;
5391 DEBUG(D_transport) debug_printf("temporary delivery error(s) override "
5392 "hosts_max_try (message older than host's retry time)\n");
5398 if (unexpired_hosts_tried >= ob->hosts_max_try)
5399 debug_printf("reached transport hosts_max_try limit %d\n",
5401 if (total_hosts_tried >= ob->hosts_max_try_hardlimit)
5402 debug_printf("reached transport hosts_max_try_hardlimit limit %d\n",
5403 ob->hosts_max_try_hardlimit);
5406 testharness_pause_ms(500); /* let server debug out */
5407 } /* End of loop for trying multiple hosts. */
5409 /* If we failed to find a matching host in the list, for an already-open
5410 connection, just close it and start over with the list. This can happen
5411 for routing that changes from run to run, or big multi-IP sites with
5414 if (continue_hostname && !continue_host_tried)
5416 int fd = cutthrough.cctx.sock >= 0 ? cutthrough.cctx.sock : 0;
5418 DEBUG(D_transport) debug_printf("no hosts match already-open connection\n");
5420 /* A TLS conn could be open for a cutthrough, but not for a plain continued-
5422 /*XXX doublecheck that! */
5424 if (cutthrough.cctx.sock >= 0 && cutthrough.is_tls)
5426 (void) tls_write(cutthrough.cctx.tls_ctx, US"QUIT\r\n", 6, FALSE);
5427 tls_close(cutthrough.cctx.tls_ctx, TLS_SHUTDOWN_NOWAIT);
5428 cutthrough.cctx.tls_ctx = NULL;
5429 cutthrough.is_tls = FALSE;
5433 (void) write(fd, US"QUIT\r\n", 6);
5436 cutthrough.cctx.sock = -1;
5437 continue_hostname = NULL;
5438 goto retry_non_continued;
5441 /* This is the end of the loop that repeats iff expired is TRUE and
5442 ob->delay_after_cutoff is FALSE. The second time round we will
5443 try those hosts that haven't been tried since the message arrived. */
5447 debug_printf("all IP addresses skipped or deferred at least one address\n");
5448 if (expired && !ob->delay_after_cutoff && cutoff_retry == 0)
5449 debug_printf("retrying IP addresses not tried since message arrived\n");
5454 /* Get here if all IP addresses are skipped or defer at least one address. In
5455 MUA wrapper mode, this will happen only for connection or other non-message-
5456 specific failures. Force the delivery status for all addresses to FAIL. */
5460 for (address_item * addr = addrlist; addr; addr = addr->next)
5461 addr->transport_return = FAIL;
5465 /* In the normal, non-wrapper case, add a standard message to each deferred
5466 address if there hasn't been an error, that is, if it hasn't actually been
5467 tried this time. The variable "expired" will be FALSE if any deliveries were
5468 actually tried, or if there was at least one host that was not expired. That
5469 is, it is TRUE only if no deliveries were tried and all hosts were expired. If
5470 a delivery has been tried, an error code will be set, and the failing of the
5471 message is handled by the retry code later.
5473 If queue_smtp is set, or this transport was called to send a subsequent message
5474 down an existing TCP/IP connection, and something caused the host not to be
5475 found, we end up here, but can detect these cases and handle them specially. */
5477 for (address_item * addr = addrlist; addr; addr = addr->next)
5479 /* If host is not NULL, it means that we stopped processing the host list
5480 because of hosts_max_try or hosts_max_try_hardlimit. In the former case, this
5481 means we need to behave as if some hosts were skipped because their retry
5482 time had not come. Specifically, this prevents the address from timing out.
5483 However, if we have hit hosts_max_try_hardlimit, we want to behave as if all
5484 hosts were tried. */
5487 if (total_hosts_tried >= ob->hosts_max_try_hardlimit)
5490 debug_printf("hosts_max_try_hardlimit reached: behave as if all "
5491 "hosts were tried\n");
5496 debug_printf("hosts_max_try limit caused some hosts to be skipped\n");
5497 setflag(addr, af_retry_skipped);
5500 if (f.queue_smtp) /* no deliveries attempted */
5502 addr->transport_return = DEFER;
5503 addr->basic_errno = 0;
5504 addr->message = US"SMTP delivery explicitly queued";
5507 else if ( addr->transport_return == DEFER
5508 && (addr->basic_errno == ERRNO_UNKNOWNERROR || addr->basic_errno == 0)
5512 addr->basic_errno = ERRNO_HRETRY;
5513 if (continue_hostname)
5514 addr->message = US"no host found for existing SMTP connection";
5517 setflag(addr, af_pass_message); /* This is not a security risk */
5518 addr->message = string_sprintf(
5519 "all hosts%s have been failing for a long time %s",
5520 addr->domain ? string_sprintf(" for '%s'", addr->domain) : US"",
5521 ob->delay_after_cutoff
5522 ? US"(and retry time not reached)"
5523 : US"and were last tried after this message arrived");
5525 /* If we are already using fallback hosts, or there are no fallback hosts
5526 defined, convert the result to FAIL to cause a bounce. */
5528 if (addr->host_list == addr->fallback_hosts || !addr->fallback_hosts)
5529 addr->transport_return = FAIL;
5534 if (hosts_retry == hosts_total)
5535 s = "retry time not reached for any host%s";
5536 else if (hosts_fail == hosts_total)
5537 s = "all host address lookups%s failed permanently";
5538 else if (hosts_defer == hosts_total)
5539 s = "all host address lookups%s failed temporarily";
5540 else if (hosts_serial == hosts_total)
5541 s = "connection limit reached for all hosts%s";
5542 else if (hosts_fail+hosts_defer == hosts_total)
5543 s = "all host address lookups%s failed";
5545 s = "some host address lookups failed and retry time "
5546 "not reached for other hosts or connection limit reached%s";
5548 addr->message = string_sprintf(s,
5549 addr->domain ? string_sprintf(" for '%s'", addr->domain) : US"");
5554 /* Update the database which keeps information about which messages are waiting
5555 for which hosts to become available. For some message-specific errors, the
5556 update_waiting flag is turned off because we don't want follow-on deliveries in
5557 those cases. If this transport instance is explicitly limited to one message
5558 per connection then follow-on deliveries are not possible and there's no need
5559 to create/update the per-transport wait-<transport_name> database. */
5561 if (update_waiting && tblock->connection_max_messages != 1)
5562 transport_update_waiting(hostlist, tblock->name);
5566 DEBUG(D_transport) debug_printf("Leaving %s transport\n", tblock->name);
5568 return TRUE; /* Each address has its status */
5571 #endif /*!MACRO_PREDEF*/
5574 /* End of transport/smtp.c */