1 /*************************************************
2 * Exim - an Internet mail transport agent *
3 *************************************************/
5 /* Copyright (c) University of Cambridge 1995 - 2014 */
6 /* See the file NOTICE for conditions of use and distribution. */
12 #define PENDING_DEFER (PENDING + DEFER)
13 #define PENDING_OK (PENDING + OK)
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 { "address_retry_include_sender", opt_bool,
23 (void *)offsetof(smtp_transport_options_block, address_retry_include_sender) },
24 { "allow_localhost", opt_bool,
25 (void *)offsetof(smtp_transport_options_block, allow_localhost) },
26 { "authenticated_sender", opt_stringptr,
27 (void *)offsetof(smtp_transport_options_block, authenticated_sender) },
28 { "authenticated_sender_force", opt_bool,
29 (void *)offsetof(smtp_transport_options_block, authenticated_sender_force) },
30 { "command_timeout", opt_time,
31 (void *)offsetof(smtp_transport_options_block, command_timeout) },
32 { "connect_timeout", opt_time,
33 (void *)offsetof(smtp_transport_options_block, connect_timeout) },
34 { "connection_max_messages", opt_int | opt_public,
35 (void *)offsetof(transport_instance, connection_max_messages) },
36 { "data_timeout", opt_time,
37 (void *)offsetof(smtp_transport_options_block, data_timeout) },
38 { "delay_after_cutoff", opt_bool,
39 (void *)offsetof(smtp_transport_options_block, delay_after_cutoff) },
41 { "dkim_canon", opt_stringptr,
42 (void *)offsetof(smtp_transport_options_block, dkim_canon) },
43 { "dkim_domain", opt_stringptr,
44 (void *)offsetof(smtp_transport_options_block, dkim_domain) },
45 { "dkim_private_key", opt_stringptr,
46 (void *)offsetof(smtp_transport_options_block, dkim_private_key) },
47 { "dkim_selector", opt_stringptr,
48 (void *)offsetof(smtp_transport_options_block, dkim_selector) },
49 { "dkim_sign_headers", opt_stringptr,
50 (void *)offsetof(smtp_transport_options_block, dkim_sign_headers) },
51 { "dkim_strict", opt_stringptr,
52 (void *)offsetof(smtp_transport_options_block, dkim_strict) },
54 { "dns_qualify_single", opt_bool,
55 (void *)offsetof(smtp_transport_options_block, dns_qualify_single) },
56 { "dns_search_parents", opt_bool,
57 (void *)offsetof(smtp_transport_options_block, dns_search_parents) },
58 { "dnssec_request_domains", opt_stringptr,
59 (void *)offsetof(smtp_transport_options_block, dnssec_request_domains) },
60 { "dnssec_require_domains", opt_stringptr,
61 (void *)offsetof(smtp_transport_options_block, dnssec_require_domains) },
62 { "dscp", opt_stringptr,
63 (void *)offsetof(smtp_transport_options_block, dscp) },
64 { "fallback_hosts", opt_stringptr,
65 (void *)offsetof(smtp_transport_options_block, fallback_hosts) },
66 { "final_timeout", opt_time,
67 (void *)offsetof(smtp_transport_options_block, final_timeout) },
68 { "gethostbyname", opt_bool,
69 (void *)offsetof(smtp_transport_options_block, gethostbyname) },
71 /* These are no longer honoured, as of Exim 4.80; for now, we silently
72 ignore; a later release will warn, and a later-still release will remove
73 these options, so that using them becomes an error. */
74 { "gnutls_require_kx", opt_stringptr,
75 (void *)offsetof(smtp_transport_options_block, gnutls_require_kx) },
76 { "gnutls_require_mac", opt_stringptr,
77 (void *)offsetof(smtp_transport_options_block, gnutls_require_mac) },
78 { "gnutls_require_protocols", opt_stringptr,
79 (void *)offsetof(smtp_transport_options_block, gnutls_require_proto) },
81 { "helo_data", opt_stringptr,
82 (void *)offsetof(smtp_transport_options_block, helo_data) },
83 { "hosts", opt_stringptr,
84 (void *)offsetof(smtp_transport_options_block, hosts) },
85 { "hosts_avoid_esmtp", opt_stringptr,
86 (void *)offsetof(smtp_transport_options_block, hosts_avoid_esmtp) },
87 { "hosts_avoid_pipelining", opt_stringptr,
88 (void *)offsetof(smtp_transport_options_block, hosts_avoid_pipelining) },
90 { "hosts_avoid_tls", opt_stringptr,
91 (void *)offsetof(smtp_transport_options_block, hosts_avoid_tls) },
93 { "hosts_max_try", opt_int,
94 (void *)offsetof(smtp_transport_options_block, hosts_max_try) },
95 { "hosts_max_try_hardlimit", opt_int,
96 (void *)offsetof(smtp_transport_options_block, hosts_max_try_hardlimit) },
98 { "hosts_nopass_tls", opt_stringptr,
99 (void *)offsetof(smtp_transport_options_block, hosts_nopass_tls) },
101 { "hosts_override", opt_bool,
102 (void *)offsetof(smtp_transport_options_block, hosts_override) },
103 { "hosts_randomize", opt_bool,
104 (void *)offsetof(smtp_transport_options_block, hosts_randomize) },
105 #if defined(SUPPORT_TLS) && defined(EXPERIMENTAL_OCSP)
106 { "hosts_request_ocsp", opt_stringptr,
107 (void *)offsetof(smtp_transport_options_block, hosts_request_ocsp) },
109 { "hosts_require_auth", opt_stringptr,
110 (void *)offsetof(smtp_transport_options_block, hosts_require_auth) },
112 # if defined EXPERIMENTAL_OCSP
113 { "hosts_require_ocsp", opt_stringptr,
114 (void *)offsetof(smtp_transport_options_block, hosts_require_ocsp) },
116 { "hosts_require_tls", opt_stringptr,
117 (void *)offsetof(smtp_transport_options_block, hosts_require_tls) },
119 { "hosts_try_auth", opt_stringptr,
120 (void *)offsetof(smtp_transport_options_block, hosts_try_auth) },
122 { "hosts_try_prdr", opt_stringptr,
123 (void *)offsetof(smtp_transport_options_block, hosts_try_prdr) },
126 { "hosts_verify_avoid_tls", opt_stringptr,
127 (void *)offsetof(smtp_transport_options_block, hosts_verify_avoid_tls) },
129 { "interface", opt_stringptr,
130 (void *)offsetof(smtp_transport_options_block, interface) },
131 { "keepalive", opt_bool,
132 (void *)offsetof(smtp_transport_options_block, keepalive) },
133 { "lmtp_ignore_quota", opt_bool,
134 (void *)offsetof(smtp_transport_options_block, lmtp_ignore_quota) },
135 { "max_rcpt", opt_int | opt_public,
136 (void *)offsetof(transport_instance, max_addresses) },
137 { "multi_domain", opt_bool | opt_public,
138 (void *)offsetof(transport_instance, multi_domain) },
139 { "port", opt_stringptr,
140 (void *)offsetof(smtp_transport_options_block, port) },
141 { "protocol", opt_stringptr,
142 (void *)offsetof(smtp_transport_options_block, protocol) },
143 { "retry_include_ip_address", opt_bool,
144 (void *)offsetof(smtp_transport_options_block, retry_include_ip_address) },
145 { "serialize_hosts", opt_stringptr,
146 (void *)offsetof(smtp_transport_options_block, serialize_hosts) },
147 { "size_addition", opt_int,
148 (void *)offsetof(smtp_transport_options_block, size_addition) }
150 ,{ "tls_certificate", opt_stringptr,
151 (void *)offsetof(smtp_transport_options_block, tls_certificate) },
152 { "tls_crl", opt_stringptr,
153 (void *)offsetof(smtp_transport_options_block, tls_crl) },
154 { "tls_dh_min_bits", opt_int,
155 (void *)offsetof(smtp_transport_options_block, tls_dh_min_bits) },
156 { "tls_privatekey", opt_stringptr,
157 (void *)offsetof(smtp_transport_options_block, tls_privatekey) },
158 { "tls_require_ciphers", opt_stringptr,
159 (void *)offsetof(smtp_transport_options_block, tls_require_ciphers) },
160 { "tls_sni", opt_stringptr,
161 (void *)offsetof(smtp_transport_options_block, tls_sni) },
162 { "tls_tempfail_tryclear", opt_bool,
163 (void *)offsetof(smtp_transport_options_block, tls_tempfail_tryclear) },
164 { "tls_try_verify_hosts", opt_stringptr,
165 (void *)offsetof(smtp_transport_options_block, tls_try_verify_hosts) },
166 #ifdef EXPERIMENTAL_CERTNAMES
167 { "tls_verify_cert_hostnames", opt_stringptr,
168 (void *)offsetof(smtp_transport_options_block,tls_verify_cert_hostnames)},
170 { "tls_verify_certificates", opt_stringptr,
171 (void *)offsetof(smtp_transport_options_block, tls_verify_certificates) },
172 { "tls_verify_hosts", opt_stringptr,
173 (void *)offsetof(smtp_transport_options_block, tls_verify_hosts) }
175 #ifdef EXPERIMENTAL_TPDA
176 ,{ "tpda_host_defer_action", opt_stringptr,
177 (void *)offsetof(smtp_transport_options_block, tpda_host_defer_action) },
181 /* Size of the options list. An extern variable has to be used so that its
182 address can appear in the tables drtables.c. */
184 int smtp_transport_options_count =
185 sizeof(smtp_transport_options)/sizeof(optionlist);
187 /* Default private options block for the smtp transport. */
189 smtp_transport_options_block smtp_transport_option_defaults = {
191 NULL, /* fallback_hosts */
193 NULL, /* fallback_hostlist */
194 NULL, /* authenticated_sender */
195 US"$primary_hostname", /* helo_data */
196 NULL, /* interface */
198 US"smtp", /* protocol */
200 NULL, /* serialize_hosts */
201 NULL, /* hosts_try_auth */
202 NULL, /* hosts_require_auth */
204 NULL, /* hosts_try_prdr */
206 #ifdef EXPERIMENTAL_OCSP
207 US"*", /* hosts_request_ocsp */
208 NULL, /* hosts_require_ocsp */
210 NULL, /* hosts_require_tls */
211 NULL, /* hosts_avoid_tls */
212 US"*", /* hosts_verify_avoid_tls */
213 NULL, /* hosts_avoid_pipelining */
214 NULL, /* hosts_avoid_esmtp */
215 NULL, /* hosts_nopass_tls */
216 5*60, /* command_timeout */
217 5*60, /* connect_timeout; shorter system default overrides */
218 5*60, /* data timeout */
219 10*60, /* final timeout */
220 1024, /* size_addition */
221 5, /* hosts_max_try */
222 50, /* hosts_max_try_hardlimit */
223 TRUE, /* address_retry_include_sender */
224 FALSE, /* allow_localhost */
225 FALSE, /* authenticated_sender_force */
226 FALSE, /* gethostbyname */
227 TRUE, /* dns_qualify_single */
228 FALSE, /* dns_search_parents */
229 NULL, /* dnssec_request_domains */
230 NULL, /* dnssec_require_domains */
231 TRUE, /* delay_after_cutoff */
232 FALSE, /* hosts_override */
233 FALSE, /* hosts_randomize */
234 TRUE, /* keepalive */
235 FALSE, /* lmtp_ignore_quota */
236 TRUE /* retry_include_ip_address */
238 ,NULL, /* tls_certificate */
240 NULL, /* tls_privatekey */
241 NULL, /* tls_require_ciphers */
242 NULL, /* gnutls_require_kx */
243 NULL, /* gnutls_require_mac */
244 NULL, /* gnutls_require_proto */
246 NULL, /* tls_verify_certificates */
247 EXIM_CLIENT_DH_DEFAULT_MIN_BITS,
248 /* tls_dh_min_bits */
249 TRUE, /* tls_tempfail_tryclear */
250 NULL, /* tls_verify_hosts */
251 NULL /* tls_try_verify_hosts */
252 # ifdef EXPERIMENTAL_CERTNAMES
253 ,NULL /* tls_verify_cert_hostnames */
257 ,NULL, /* dkim_canon */
258 NULL, /* dkim_domain */
259 NULL, /* dkim_private_key */
260 NULL, /* dkim_selector */
261 NULL, /* dkim_sign_headers */
262 NULL /* dkim_strict */
264 #ifdef EXPERIMENTAL_TPDA
265 ,NULL /* tpda_host_defer_action */
272 static uschar *smtp_command; /* Points to last cmd for error messages */
273 static uschar *mail_command; /* Points to MAIL cmd for error messages */
274 static BOOL update_waiting; /* TRUE to update the "wait" database */
277 /*************************************************
278 * Setup entry point *
279 *************************************************/
281 /* This function is called when the transport is about to be used,
282 but before running it in a sub-process. It is used for two things:
284 (1) To set the fallback host list in addresses, when delivering.
285 (2) To pass back the interface, port, protocol, and other options, for use
286 during callout verification.
289 tblock pointer to the transport instance block
290 addrlist list of addresses about to be transported
291 tf if not NULL, pointer to block in which to return options
292 uid the uid that will be set (not used)
293 gid the gid that will be set (not used)
294 errmsg place for error message (not used)
296 Returns: OK always (FAIL, DEFER not used)
300 smtp_transport_setup(transport_instance *tblock, address_item *addrlist,
301 transport_feedback *tf, uid_t uid, gid_t gid, uschar **errmsg)
303 smtp_transport_options_block *ob =
304 (smtp_transport_options_block *)(tblock->options_block);
306 errmsg = errmsg; /* Keep picky compilers happy */
310 /* Pass back options if required. This interface is getting very messy. */
314 tf->interface = ob->interface;
316 tf->protocol = ob->protocol;
317 tf->hosts = ob->hosts;
318 tf->hosts_override = ob->hosts_override;
319 tf->hosts_randomize = ob->hosts_randomize;
320 tf->gethostbyname = ob->gethostbyname;
321 tf->qualify_single = ob->dns_qualify_single;
322 tf->search_parents = ob->dns_search_parents;
323 tf->helo_data = ob->helo_data;
326 /* Set the fallback host list for all the addresses that don't have fallback
327 host lists, provided that the local host wasn't present in the original host
330 if (!testflag(addrlist, af_local_host_removed))
332 for (; addrlist != NULL; addrlist = addrlist->next)
333 if (addrlist->fallback_hosts == NULL)
334 addrlist->fallback_hosts = ob->fallback_hostlist;
342 /*************************************************
343 * Initialization entry point *
344 *************************************************/
346 /* Called for each instance, after its options have been read, to
347 enable consistency checks to be done, or anything else that needs
350 Argument: pointer to the transport instance block
355 smtp_transport_init(transport_instance *tblock)
357 smtp_transport_options_block *ob =
358 (smtp_transport_options_block *)(tblock->options_block);
360 /* Retry_use_local_part defaults FALSE if unset */
362 if (tblock->retry_use_local_part == TRUE_UNSET)
363 tblock->retry_use_local_part = FALSE;
365 /* Set the default port according to the protocol */
367 if (ob->port == NULL)
368 ob->port = (strcmpic(ob->protocol, US"lmtp") == 0)? US"lmtp" :
369 (strcmpic(ob->protocol, US"smtps") == 0)? US"smtps" : US"smtp";
371 /* Set up the setup entry point, to be called before subprocesses for this
374 tblock->setup = smtp_transport_setup;
376 /* Complain if any of the timeouts are zero. */
378 if (ob->command_timeout <= 0 || ob->data_timeout <= 0 ||
379 ob->final_timeout <= 0)
380 log_write(0, LOG_PANIC_DIE|LOG_CONFIG,
381 "command, data, or final timeout value is zero for %s transport",
384 /* If hosts_override is set and there are local hosts, set the global
385 flag that stops verify from showing router hosts. */
387 if (ob->hosts_override && ob->hosts != NULL) tblock->overrides_hosts = TRUE;
389 /* If there are any fallback hosts listed, build a chain of host items
390 for them, but do not do any lookups at this time. */
392 host_build_hostlist(&(ob->fallback_hostlist), ob->fallback_hosts, FALSE);
399 /*************************************************
400 * Set delivery info into all active addresses *
401 *************************************************/
403 /* Only addresses whose status is >= PENDING are relevant. A lesser
404 status means that an address is not currently being processed.
407 addrlist points to a chain of addresses
408 errno_value to put in each address's errno field
409 msg to put in each address's message field
410 rc to put in each address's transport_return field
411 pass_message if TRUE, set the "pass message" flag in the address
413 If errno_value has the special value ERRNO_CONNECTTIMEOUT, ETIMEDOUT is put in
414 the errno field, and RTEF_CTOUT is ORed into the more_errno field, to indicate
415 this particular type of timeout.
421 set_errno(address_item *addrlist, int errno_value, uschar *msg, int rc,
426 if (errno_value == ERRNO_CONNECTTIMEOUT)
428 errno_value = ETIMEDOUT;
429 orvalue = RTEF_CTOUT;
431 for (addr = addrlist; addr != NULL; addr = addr->next)
433 if (addr->transport_return < PENDING) continue;
434 addr->basic_errno = errno_value;
435 addr->more_errno |= orvalue;
439 if (pass_message) setflag(addr, af_pass_message);
441 addr->transport_return = rc;
447 /*************************************************
448 * Check an SMTP response *
449 *************************************************/
451 /* This function is given an errno code and the SMTP response buffer
452 to analyse, together with the host identification for generating messages. It
453 sets an appropriate message and puts the first digit of the response code into
454 the yield variable. If no response was actually read, a suitable digit is
458 host the current host, to get its name for messages
459 errno_value pointer to the errno value
460 more_errno from the top address for use with ERRNO_FILTER_FAIL
461 buffer the SMTP response buffer
462 yield where to put a one-digit SMTP response code
463 message where to put an errror message
464 pass_message set TRUE if message is an SMTP response
466 Returns: TRUE if an SMTP "QUIT" command should be sent, else FALSE
469 static BOOL check_response(host_item *host, int *errno_value, int more_errno,
470 uschar *buffer, int *yield, uschar **message, BOOL *pass_message)
474 if (smtp_use_pipelining &&
475 (Ustrcmp(smtp_command, "MAIL") == 0 ||
476 Ustrcmp(smtp_command, "RCPT") == 0 ||
477 Ustrcmp(smtp_command, "DATA") == 0))
480 *yield = '4'; /* Default setting is to give a temporary error */
482 /* Handle response timeout */
484 if (*errno_value == ETIMEDOUT)
486 *message = US string_sprintf("SMTP timeout while connected to %s [%s] "
487 "after %s%s", host->name, host->address, pl, smtp_command);
488 if (transport_count > 0)
489 *message = US string_sprintf("%s (%d bytes written)", *message,
494 /* Handle malformed SMTP response */
496 if (*errno_value == ERRNO_SMTPFORMAT)
498 uschar *malfresp = string_printing(buffer);
499 while (isspace(*malfresp)) malfresp++;
501 *message = string_sprintf("Malformed SMTP reply (an empty line) from "
502 "%s [%s] in response to %s%s", host->name, host->address, pl,
505 *message = string_sprintf("Malformed SMTP reply from %s [%s] in response "
506 "to %s%s: %s", host->name, host->address, pl, smtp_command, malfresp);
510 /* Handle a failed filter process error; can't send QUIT as we mustn't
513 if (*errno_value == ERRNO_FILTER_FAIL)
515 *message = US string_sprintf("transport filter process failed (%d)%s",
517 (more_errno == EX_EXECFAILED)? ": unable to execute command" : "");
521 /* Handle a failed add_headers expansion; can't send QUIT as we mustn't
524 if (*errno_value == ERRNO_CHHEADER_FAIL)
527 US string_sprintf("failed to expand headers_add or headers_remove: %s",
528 expand_string_message);
532 /* Handle failure to write a complete data block */
534 if (*errno_value == ERRNO_WRITEINCOMPLETE)
536 *message = US string_sprintf("failed to write a data block");
540 /* Handle error responses from the remote mailer. */
544 uschar *s = string_printing(buffer);
545 *message = US string_sprintf("SMTP error from remote mail server after %s%s: "
546 "host %s [%s]: %s", pl, smtp_command, host->name, host->address, s);
547 *pass_message = TRUE;
552 /* No data was read. If there is no errno, this must be the EOF (i.e.
553 connection closed) case, which causes deferral. An explicit connection reset
554 error has the same effect. Otherwise, put the host's identity in the message,
555 leaving the errno value to be interpreted as well. In all cases, we have to
556 assume the connection is now dead. */
558 if (*errno_value == 0 || *errno_value == ECONNRESET)
560 *errno_value = ERRNO_SMTPCLOSED;
561 *message = US string_sprintf("Remote host %s [%s] closed connection "
562 "in response to %s%s", host->name, host->address, pl, smtp_command);
564 else *message = US string_sprintf("%s [%s]", host->name, host->address);
571 /*************************************************
572 * Write error message to logs *
573 *************************************************/
575 /* This writes to the main log and to the message log.
578 addr the address item containing error information
579 host the current host
585 write_logs(address_item *addr, host_item *host)
587 if (addr->message != NULL)
589 uschar *message = addr->message;
590 if (addr->basic_errno > 0)
591 message = string_sprintf("%s: %s", message, strerror(addr->basic_errno));
592 log_write(0, LOG_MAIN, "%s", message);
593 deliver_msglog("%s %s\n", tod_stamp(tod_log), message);
598 ((log_extra_selector & LX_outgoing_port) != 0)?
599 string_sprintf("%s [%s]:%d", host->name, host->address,
600 (host->port == PORT_NONE)? 25 : host->port)
602 string_sprintf("%s [%s]", host->name, host->address);
603 log_write(0, LOG_MAIN, "%s %s", msg, strerror(addr->basic_errno));
604 deliver_msglog("%s %s %s\n", tod_stamp(tod_log), msg,
605 strerror(addr->basic_errno));
611 #ifdef EXPERIMENTAL_TPDA
612 /*************************************************
613 * Post-defer action *
614 *************************************************/
616 /* This expands an arbitrary per-transport string.
617 It might, for example, be used to write to the database log.
620 ob transport options block
621 addr the address item containing error information
622 host the current host
628 tpda_deferred(smtp_transport_options_block *ob, address_item *addr, host_item *host)
630 uschar *action = ob->tpda_host_defer_action;
634 tpda_delivery_ip = string_copy(host->address);
635 tpda_delivery_port = (host->port == PORT_NONE)? 25 : host->port;
636 tpda_delivery_fqdn = string_copy(host->name);
637 tpda_delivery_local_part = string_copy(addr->local_part);
638 tpda_delivery_domain = string_copy(addr->domain);
639 tpda_defer_errno = addr->basic_errno;
641 tpda_defer_errstr = addr->message
642 ? addr->basic_errno > 0
643 ? string_sprintf("%s: %s", addr->message, strerror(addr->basic_errno))
644 : string_copy(addr->message)
645 : addr->basic_errno > 0
646 ? string_copy(US strerror(addr->basic_errno))
650 debug_printf(" TPDA(host defer): tpda_host_defer_action=|%s| tpda_delivery_IP=%s\n",
651 action, tpda_delivery_ip);
653 router_name = addr->router->name;
654 transport_name = addr->transport->name;
655 if (!expand_string(action) && *expand_string_message)
656 log_write(0, LOG_MAIN|LOG_PANIC, "failed to expand tpda_defer_action in %s: %s\n",
657 transport_name, expand_string_message);
658 router_name = transport_name = NULL;
664 /*************************************************
665 * Synchronize SMTP responses *
666 *************************************************/
668 /* This function is called from smtp_deliver() to receive SMTP responses from
669 the server, and match them up with the commands to which they relate. When
670 PIPELINING is not in use, this function is called after every command, and is
671 therefore somewhat over-engineered, but it is simpler to use a single scheme
672 that works both with and without PIPELINING instead of having two separate sets
675 The set of commands that are buffered up with pipelining may start with MAIL
676 and may end with DATA; in between are RCPT commands that correspond to the
677 addresses whose status is PENDING_DEFER. All other commands (STARTTLS, AUTH,
678 etc.) are never buffered.
680 Errors after MAIL or DATA abort the whole process leaving the response in the
681 buffer. After MAIL, pending responses are flushed, and the original command is
682 re-instated in big_buffer for error messages. For RCPT commands, the remote is
683 permitted to reject some recipient addresses while accepting others. However
684 certain errors clearly abort the whole process. Set the value in
685 transport_return to PENDING_OK if the address is accepted. If there is a
686 subsequent general error, it will get reset accordingly. If not, it will get
687 converted to OK at the end.
690 addrlist the complete address list
691 include_affixes TRUE if affixes include in RCPT
692 sync_addr ptr to the ptr of the one to start scanning at (updated)
693 host the host we are connected to
694 count the number of responses to read
696 include_sender true if 4xx retry is to include the sender it its key
697 pending_MAIL true if the first response is for MAIL
698 pending_DATA 0 if last command sent was not DATA
699 +1 if previously had a good recipient
700 -1 if not previously had a good recipient
701 inblock incoming SMTP block
702 timeout timeout value
703 buffer buffer for reading response
704 buffsize size of buffer
706 Returns: 3 if at least one address had 2xx and one had 5xx
707 2 if at least one address had 5xx but none had 2xx
708 1 if at least one host had a 2xx response, but none had 5xx
709 0 no address had 2xx or 5xx but no errors (all 4xx, or just DATA)
710 -1 timeout while reading RCPT response
711 -2 I/O or other non-response error for RCPT
712 -3 DATA or MAIL failed - errno and buffer set
716 sync_responses(address_item *addrlist, BOOL include_affixes,
717 address_item **sync_addr, host_item *host, int count,
718 BOOL address_retry_include_sender, BOOL pending_MAIL,
719 int pending_DATA, smtp_inblock *inblock, int timeout, uschar *buffer,
722 address_item *addr = *sync_addr;
725 /* Handle the response for a MAIL command. On error, reinstate the original
726 command in big_buffer for error message use, and flush any further pending
727 responses before returning, except after I/O errors and timeouts. */
732 if (!smtp_read_response(inblock, buffer, buffsize, '2', timeout))
734 Ustrcpy(big_buffer, mail_command); /* Fits, because it came from there! */
735 if (errno == 0 && buffer[0] != 0)
737 uschar flushbuffer[4096];
739 if (buffer[0] == '4')
741 save_errno = ERRNO_MAIL4XX;
742 addr->more_errno |= ((buffer[1] - '0')*10 + buffer[2] - '0') << 8;
746 if (!smtp_read_response(inblock, flushbuffer, sizeof(flushbuffer),
748 && (errno != 0 || flushbuffer[0] == 0))
757 if (pending_DATA) count--; /* Number of RCPT responses to come */
759 /* Read and handle the required number of RCPT responses, matching each one up
760 with an address by scanning for the next address whose status is PENDING_DEFER.
765 while (addr->transport_return != PENDING_DEFER) addr = addr->next;
767 /* The address was accepted */
769 if (smtp_read_response(inblock, buffer, buffsize, '2', timeout))
772 addr->transport_return = PENDING_OK;
774 /* If af_dr_retry_exists is set, there was a routing delay on this address;
775 ensure that any address-specific retry record is expunged. We do this both
776 for the basic key and for the version that also includes the sender. */
778 if (testflag(addr, af_dr_retry_exists))
780 uschar *altkey = string_sprintf("%s:<%s>", addr->address_retry_key,
782 retry_add_item(addr, altkey, rf_delete);
783 retry_add_item(addr, addr->address_retry_key, rf_delete);
787 /* Timeout while reading the response */
789 else if (errno == ETIMEDOUT)
791 int save_errno = errno;
792 uschar *message = string_sprintf("SMTP timeout while connected to %s [%s] "
793 "after RCPT TO:<%s>", host->name, host->address,
794 transport_rcpt_address(addr, include_affixes));
795 set_errno(addrlist, save_errno, message, DEFER, FALSE);
796 retry_add_item(addr, addr->address_retry_key, 0);
797 update_waiting = FALSE;
801 /* Handle other errors in obtaining an SMTP response by returning -1. This
802 will cause all the addresses to be deferred. Restore the SMTP command in
803 big_buffer for which we are checking the response, so the error message
806 else if (errno != 0 || buffer[0] == 0)
808 string_format(big_buffer, big_buffer_size, "RCPT TO:<%s>",
809 transport_rcpt_address(addr, include_affixes));
813 /* Handle SMTP permanent and temporary response codes. */
818 string_sprintf("SMTP error from remote mail server after RCPT TO:<%s>: "
819 "host %s [%s]: %s", transport_rcpt_address(addr, include_affixes),
820 host->name, host->address, string_printing(buffer));
821 setflag(addr, af_pass_message);
822 deliver_msglog("%s %s\n", tod_stamp(tod_log), addr->message);
824 /* The response was 5xx */
826 if (buffer[0] == '5')
828 addr->transport_return = FAIL;
832 /* The response was 4xx */
836 addr->transport_return = DEFER;
837 addr->basic_errno = ERRNO_RCPT4XX;
838 addr->more_errno |= ((buffer[1] - '0')*10 + buffer[2] - '0') << 8;
840 /* Log temporary errors if there are more hosts to be tried. */
842 if (host->next != NULL) log_write(0, LOG_MAIN, "%s", addr->message);
844 /* Do not put this message on the list of those waiting for specific
845 hosts, as otherwise it is likely to be tried too often. */
847 update_waiting = FALSE;
849 /* Add a retry item for the address so that it doesn't get tried again
850 too soon. If address_retry_include_sender is true, add the sender address
853 if (address_retry_include_sender)
855 uschar *altkey = string_sprintf("%s:<%s>", addr->address_retry_key,
857 retry_add_item(addr, altkey, 0);
859 else retry_add_item(addr, addr->address_retry_key, 0);
862 } /* Loop for next RCPT response */
864 /* Update where to start at for the next block of responses, unless we
865 have already handled all the addresses. */
867 if (addr != NULL) *sync_addr = addr->next;
869 /* Handle a response to DATA. If we have not had any good recipients, either
870 previously or in this block, the response is ignored. */
872 if (pending_DATA != 0 &&
873 !smtp_read_response(inblock, buffer, buffsize, '3', timeout))
878 if (pending_DATA > 0 || (yield & 1) != 0)
880 if (errno == 0 && buffer[0] == '4')
882 errno = ERRNO_DATA4XX;
883 addrlist->more_errno |= ((buffer[1] - '0')*10 + buffer[2] - '0') << 8;
887 (void)check_response(host, &errno, 0, buffer, &code, &msg, &pass_message);
888 DEBUG(D_transport) debug_printf("%s\nerror for DATA ignored: pipelining "
889 "is in use and there were no good recipients\n", msg);
892 /* All responses read and handled; MAIL (if present) received 2xx and DATA (if
893 present) received 3xx. If any RCPTs were handled and yielded anything other
894 than 4xx, yield will be set non-zero. */
901 /* Do the client side of smtp-level authentication */
904 buffer EHLO response from server (gets overwritten)
905 addrlist chain of potential addresses to deliver
906 host host to deliver to
908 ibp, obp comms channel control blocks
911 OK Success, or failed (but not required): global "smtp_authenticated" set
912 DEFER Failed authentication (and was required)
913 ERROR Internal problem
915 FAIL_SEND Failed communications - transmit
920 smtp_auth(uschar *buffer, unsigned bufsize, address_item *addrlist, host_item *host,
921 smtp_transport_options_block *ob, BOOL is_esmtp,
922 smtp_inblock *ibp, smtp_outblock *obp)
925 uschar *fail_reason = US"server did not advertise AUTH support";
927 smtp_authenticated = FALSE;
928 client_authenticator = client_authenticated_id = client_authenticated_sender = NULL;
929 require_auth = verify_check_this_host(&(ob->hosts_require_auth), NULL,
930 host->name, host->address, NULL);
932 if (is_esmtp && !regex_AUTH) regex_AUTH =
933 regex_must_compile(US"\\n250[\\s\\-]AUTH\\s+([\\-\\w\\s]+)(?:\\n|$)",
936 if (is_esmtp && regex_match_and_setup(regex_AUTH, buffer, 0, -1))
938 uschar *names = string_copyn(expand_nstring[1], expand_nlength[1]);
939 expand_nmax = -1; /* reset */
941 /* Must not do this check until after we have saved the result of the
942 regex match above. */
944 if (require_auth == OK ||
945 verify_check_this_host(&(ob->hosts_try_auth), NULL, host->name,
946 host->address, NULL) == OK)
949 fail_reason = US"no common mechanisms were found";
951 DEBUG(D_transport) debug_printf("scanning authentication mechanisms\n");
953 /* Scan the configured authenticators looking for one which is configured
954 for use as a client, which is not suppressed by client_condition, and
955 whose name matches an authentication mechanism supported by the server.
956 If one is found, attempt to authenticate by calling its client function.
959 for (au = auths; !smtp_authenticated && au != NULL; au = au->next)
963 (au->client_condition != NULL &&
964 !expand_check_condition(au->client_condition, au->name,
965 US"client authenticator")))
967 DEBUG(D_transport) debug_printf("skipping %s authenticator: %s\n",
969 (au->client)? "client_condition is false" :
970 "not configured as a client");
974 /* Loop to scan supported server mechanisms */
979 int len = Ustrlen(au->public_name);
980 while (isspace(*p)) p++;
982 if (strncmpic(au->public_name, p, len) != 0 ||
983 (p[len] != 0 && !isspace(p[len])))
985 while (*p != 0 && !isspace(*p)) p++;
989 /* Found data for a listed mechanism. Call its client entry. Set
990 a flag in the outblock so that data is overwritten after sending so
991 that reflections don't show it. */
993 fail_reason = US"authentication attempt(s) failed";
994 obp->authenticating = TRUE;
995 rc = (au->info->clientcode)(au, ibp, obp,
996 ob->command_timeout, buffer, bufsize);
997 obp->authenticating = FALSE;
998 DEBUG(D_transport) debug_printf("%s authenticator yielded %d\n",
1001 /* A temporary authentication failure must hold up delivery to
1002 this host. After a permanent authentication failure, we carry on
1003 to try other authentication methods. If all fail hard, try to
1004 deliver the message unauthenticated unless require_auth was set. */
1009 smtp_authenticated = TRUE; /* stops the outer loop */
1010 client_authenticator = au->name;
1011 if (au->set_client_id != NULL)
1012 client_authenticated_id = expand_string(au->set_client_id);
1015 /* Failure after writing a command */
1020 /* Failure after reading a response */
1023 if (errno != 0 || buffer[0] != '5') return FAIL;
1024 log_write(0, LOG_MAIN, "%s authenticator failed H=%s [%s] %s",
1025 au->name, host->name, host->address, buffer);
1028 /* Failure by some other means. In effect, the authenticator
1029 decided it wasn't prepared to handle this case. Typically this
1030 is the result of "fail" in an expansion string. Do we need to
1031 log anything here? Feb 2006: a message is now put in the buffer
1032 if logging is required. */
1036 log_write(0, LOG_MAIN, "%s authenticator cancelled "
1037 "authentication H=%s [%s] %s", au->name, host->name,
1038 host->address, buffer);
1041 /* Internal problem, message in buffer. */
1044 set_errno(addrlist, 0, string_copy(buffer), DEFER, FALSE);
1048 break; /* If not authenticated, try next authenticator */
1049 } /* Loop for scanning supported server mechanisms */
1050 } /* Loop for further authenticators */
1054 /* If we haven't authenticated, but are required to, give up. */
1056 if (require_auth == OK && !smtp_authenticated)
1058 set_errno(addrlist, ERRNO_AUTHFAIL,
1059 string_sprintf("authentication required but %s", fail_reason), DEFER,
1068 /* Construct AUTH appendix string for MAIL TO */
1071 buffer to build string
1072 addrlist chain of potential addresses to deliver
1073 ob transport options
1075 Globals smtp_authenticated
1076 client_authenticated_sender
1077 Return True on error, otherwise buffer has (possibly empty) terminated string
1081 smtp_mail_auth_str(uschar *buffer, unsigned bufsize, address_item *addrlist,
1082 smtp_transport_options_block *ob)
1084 uschar *local_authenticated_sender = authenticated_sender;
1087 debug_printf("smtp_mail_auth_str: as<%s> os<%s> SA<%s>\n", authenticated_sender, ob->authenticated_sender, smtp_authenticated?"Y":"N");
1090 if (ob->authenticated_sender != NULL)
1092 uschar *new = expand_string(ob->authenticated_sender);
1095 if (!expand_string_forcedfail)
1097 uschar *message = string_sprintf("failed to expand "
1098 "authenticated_sender: %s", expand_string_message);
1099 set_errno(addrlist, 0, message, DEFER, FALSE);
1103 else if (new[0] != 0) local_authenticated_sender = new;
1106 /* Add the authenticated sender address if present */
1108 if ((smtp_authenticated || ob->authenticated_sender_force) &&
1109 local_authenticated_sender != NULL)
1111 string_format(buffer, bufsize, " AUTH=%s",
1112 auth_xtextencode(local_authenticated_sender,
1113 Ustrlen(local_authenticated_sender)));
1114 client_authenticated_sender = string_copy(local_authenticated_sender);
1124 /*************************************************
1125 * Deliver address list to given host *
1126 *************************************************/
1128 /* If continue_hostname is not null, we get here only when continuing to
1129 deliver down an existing channel. The channel was passed as the standard
1130 input. TLS is never active on a passed channel; the previous process always
1131 closes it down before passing the connection on.
1133 Otherwise, we have to make a connection to the remote host, and do the
1134 initial protocol exchange.
1136 When running as an MUA wrapper, if the sender or any recipient is rejected,
1137 temporarily or permanently, we force failure for all recipients.
1140 addrlist chain of potential addresses to deliver; only those whose
1141 transport_return field is set to PENDING_DEFER are currently
1142 being processed; others should be skipped - they have either
1143 been delivered to an earlier host or IP address, or been
1144 failed by one of them.
1145 host host to deliver to
1146 host_af AF_INET or AF_INET6
1147 port default TCP/IP port to use, in host byte order
1148 interface interface to bind to, or NULL
1149 tblock transport instance block
1150 copy_host TRUE if host set in addr->host_used must be copied, because
1151 it is specific to this call of the transport
1152 message_defer set TRUE if yield is OK, but all addresses were deferred
1153 because of a non-recipient, non-host failure, that is, a
1154 4xx response to MAIL FROM, DATA, or ".". This is a defer
1155 that is specific to the message.
1156 suppress_tls if TRUE, don't attempt a TLS connection - this is set for
1157 a second attempt after TLS initialization fails
1159 Returns: OK - the connection was made and the delivery attempted;
1160 the result for each address is in its data block.
1161 DEFER - the connection could not be made, or something failed
1162 while setting up the SMTP session, or there was a
1163 non-message-specific error, such as a timeout.
1164 ERROR - a filter command is specified for this transport,
1165 and there was a problem setting it up; OR helo_data
1166 or add_headers or authenticated_sender is specified
1167 for this transport, and the string failed to expand
1171 smtp_deliver(address_item *addrlist, host_item *host, int host_af, int port,
1172 uschar *interface, transport_instance *tblock, BOOL copy_host,
1173 BOOL *message_defer, BOOL suppress_tls)
1176 address_item *sync_addr;
1177 address_item *first_addr = addrlist;
1182 time_t start_delivery_time = time(NULL);
1183 smtp_transport_options_block *ob =
1184 (smtp_transport_options_block *)(tblock->options_block);
1185 BOOL lmtp = strcmpic(ob->protocol, US"lmtp") == 0;
1186 BOOL smtps = strcmpic(ob->protocol, US"smtps") == 0;
1188 BOOL send_rset = TRUE;
1189 BOOL send_quit = TRUE;
1190 BOOL setting_up = TRUE;
1191 BOOL completed_address = FALSE;
1194 BOOL pass_message = FALSE;
1195 #ifndef DISABLE_PRDR
1196 BOOL prdr_offered = FALSE;
1199 smtp_inblock inblock;
1200 smtp_outblock outblock;
1201 int max_rcpt = tblock->max_addresses;
1202 uschar *igquotstr = US"";
1203 uschar *helo_data = NULL;
1204 uschar *message = NULL;
1205 uschar new_message_id[MESSAGE_ID_LENGTH + 1];
1207 uschar buffer[4096];
1208 uschar inbuffer[4096];
1209 uschar outbuffer[1024];
1211 suppress_tls = suppress_tls; /* stop compiler warning when no TLS support */
1213 *message_defer = FALSE;
1214 smtp_command = US"initial connection";
1215 if (max_rcpt == 0) max_rcpt = 999999;
1217 /* Set up the buffer for reading SMTP response packets. */
1219 inblock.buffer = inbuffer;
1220 inblock.buffersize = sizeof(inbuffer);
1221 inblock.ptr = inbuffer;
1222 inblock.ptrend = inbuffer;
1224 /* Set up the buffer for holding SMTP commands while pipelining */
1226 outblock.buffer = outbuffer;
1227 outblock.buffersize = sizeof(outbuffer);
1228 outblock.ptr = outbuffer;
1229 outblock.cmd_count = 0;
1230 outblock.authenticating = FALSE;
1232 /* Reset the parameters of a TLS session. */
1235 tls_out.cipher = NULL; /* the one we may use for this transport */
1236 tls_out.ourcert = NULL;
1237 tls_out.peercert = NULL;
1238 tls_out.peerdn = NULL;
1239 #if defined(SUPPORT_TLS) && !defined(USE_GNUTLS)
1242 tls_out.ocsp = OCSP_NOT_REQ;
1244 /* Flip the legacy TLS-related variables over to the outbound set in case
1245 they're used in the context of the transport. Don't bother resetting
1246 afterward as we're in a subprocess. */
1248 tls_modify_variables(&tls_out);
1253 set_errno(addrlist, 0, US"TLS support not available", DEFER, FALSE);
1258 /* Make a connection to the host if this isn't a continued delivery, and handle
1259 the initial interaction and HELO/EHLO/LHLO. Connect timeout errors are handled
1260 specially so they can be identified for retries. */
1262 if (continue_hostname == NULL)
1264 inblock.sock = outblock.sock =
1265 smtp_connect(host, host_af, port, interface, ob->connect_timeout,
1266 ob->keepalive, ob->dscp); /* This puts port into host->port */
1268 if (inblock.sock < 0)
1270 set_errno(addrlist, (errno == ETIMEDOUT)? ERRNO_CONNECTTIMEOUT : errno,
1271 NULL, DEFER, FALSE);
1275 /* Expand the greeting message while waiting for the initial response. (Makes
1276 sense if helo_data contains ${lookup dnsdb ...} stuff). The expansion is
1277 delayed till here so that $sending_interface and $sending_port are set. */
1279 helo_data = expand_string(ob->helo_data);
1281 /* The first thing is to wait for an initial OK response. The dreaded "goto"
1282 is nevertheless a reasonably clean way of programming this kind of logic,
1283 where you want to escape on any error. */
1287 if (!smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
1288 ob->command_timeout)) goto RESPONSE_FAILED;
1290 /* Now check if the helo_data expansion went well, and sign off cleanly if
1293 if (helo_data == NULL)
1295 uschar *message = string_sprintf("failed to expand helo_data: %s",
1296 expand_string_message);
1297 set_errno(addrlist, 0, message, DEFER, FALSE);
1303 /** Debugging without sending a message
1304 addrlist->transport_return = DEFER;
1308 /* Errors that occur after this point follow an SMTP command, which is
1309 left in big_buffer by smtp_write_command() for use in error messages. */
1311 smtp_command = big_buffer;
1313 /* Tell the remote who we are...
1315 February 1998: A convention has evolved that ESMTP-speaking MTAs include the
1316 string "ESMTP" in their greeting lines, so make Exim send EHLO if the
1317 greeting is of this form. The assumption was that the far end supports it
1318 properly... but experience shows that there are some that give 5xx responses,
1319 even though the banner includes "ESMTP" (there's a bloody-minded one that
1320 says "ESMTP not spoken here"). Cope with that case.
1322 September 2000: Time has passed, and it seems reasonable now to always send
1323 EHLO at the start. It is also convenient to make the change while installing
1326 July 2003: Joachim Wieland met a broken server that advertises "PIPELINING"
1327 but times out after sending MAIL FROM, RCPT TO and DATA all together. There
1328 would be no way to send out the mails, so there is now a host list
1329 "hosts_avoid_esmtp" that disables ESMTP for special hosts and solves the
1330 PIPELINING problem as well. Maybe it can also be useful to cure other
1331 problems with broken servers.
1333 Exim originally sent "Helo" at this point and ran for nearly a year that way.
1334 Then somebody tried it with a Microsoft mailer... It seems that all other
1335 mailers use upper case for some reason (the RFC is quite clear about case
1336 independence) so, for peace of mind, I gave in. */
1338 esmtp = verify_check_this_host(&(ob->hosts_avoid_esmtp), NULL,
1339 host->name, host->address, NULL) != OK;
1341 /* Alas; be careful, since this goto is not an error-out, so conceivably
1342 we might set data between here and the target which we assume to exist
1343 and be usable. I can see this coming back to bite us. */
1348 suppress_tls = FALSE;
1349 ob->tls_tempfail_tryclear = FALSE;
1350 smtp_command = US"SSL-on-connect";
1357 if (smtp_write_command(&outblock, FALSE, "%s %s\r\n",
1358 lmtp? "LHLO" : "EHLO", helo_data) < 0)
1360 if (!smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
1361 ob->command_timeout))
1363 if (errno != 0 || buffer[0] == 0 || lmtp) goto RESPONSE_FAILED;
1370 debug_printf("not sending EHLO (host matches hosts_avoid_esmtp)\n");
1375 if (smtp_write_command(&outblock, FALSE, "HELO %s\r\n", helo_data) < 0)
1377 if (!smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
1378 ob->command_timeout)) goto RESPONSE_FAILED;
1381 /* Set IGNOREQUOTA if the response to LHLO specifies support and the
1382 lmtp_ignore_quota option was set. */
1384 igquotstr = (lmtp && ob->lmtp_ignore_quota &&
1385 pcre_exec(regex_IGNOREQUOTA, NULL, CS buffer, Ustrlen(CS buffer), 0,
1386 PCRE_EOPT, NULL, 0) >= 0)? US" IGNOREQUOTA" : US"";
1388 /* Set tls_offered if the response to EHLO specifies support for STARTTLS. */
1391 tls_offered = esmtp &&
1392 pcre_exec(regex_STARTTLS, NULL, CS buffer, Ustrlen(buffer), 0,
1393 PCRE_EOPT, NULL, 0) >= 0;
1396 #ifndef DISABLE_PRDR
1397 prdr_offered = esmtp &&
1398 (pcre_exec(regex_PRDR, NULL, CS buffer, Ustrlen(buffer), 0,
1399 PCRE_EOPT, NULL, 0) >= 0) &&
1400 (verify_check_this_host(&(ob->hosts_try_prdr), NULL, host->name,
1401 host->address, NULL) == OK);
1404 {DEBUG(D_transport) debug_printf("PRDR usable\n");}
1408 /* For continuing deliveries down the same channel, the socket is the standard
1409 input, and we don't need to redo EHLO here (but may need to do so for TLS - see
1410 below). Set up the pointer to where subsequent commands will be left, for
1411 error messages. Note that smtp_use_size and smtp_use_pipelining will have been
1412 set from the command line if they were set in the process that passed the
1417 inblock.sock = outblock.sock = fileno(stdin);
1418 smtp_command = big_buffer;
1419 host->port = port; /* Record the port that was used */
1422 /* If TLS is available on this connection, whether continued or not, attempt to
1423 start up a TLS session, unless the host is in hosts_avoid_tls. If successful,
1424 send another EHLO - the server may give a different answer in secure mode. We
1425 use a separate buffer for reading the response to STARTTLS so that if it is
1426 negative, the original EHLO data is available for subsequent analysis, should
1427 the client not be required to use TLS. If the response is bad, copy the buffer
1428 for error analysis. */
1431 if (tls_offered && !suppress_tls &&
1432 verify_check_this_host(&(ob->hosts_avoid_tls), NULL, host->name,
1433 host->address, NULL) != OK)
1435 uschar buffer2[4096];
1436 if (smtp_write_command(&outblock, FALSE, "STARTTLS\r\n") < 0)
1439 /* If there is an I/O error, transmission of this message is deferred. If
1440 there is a temporary rejection of STARRTLS and tls_tempfail_tryclear is
1441 false, we also defer. However, if there is a temporary rejection of STARTTLS
1442 and tls_tempfail_tryclear is true, or if there is an outright rejection of
1443 STARTTLS, we carry on. This means we will try to send the message in clear,
1444 unless the host is in hosts_require_tls (tested below). */
1446 if (!smtp_read_response(&inblock, buffer2, sizeof(buffer2), '2',
1447 ob->command_timeout))
1449 if (errno != 0 || buffer2[0] == 0 ||
1450 (buffer2[0] == '4' && !ob->tls_tempfail_tryclear))
1452 Ustrncpy(buffer, buffer2, sizeof(buffer));
1453 goto RESPONSE_FAILED;
1457 /* STARTTLS accepted: try to negotiate a TLS session. */
1462 int rc = tls_client_start(inblock.sock, host, addrlist, ob);
1464 /* TLS negotiation failed; give an error. From outside, this function may
1465 be called again to try in clear on a new connection, if the options permit
1466 it for this host. */
1470 save_errno = ERRNO_TLSFAILURE;
1471 message = US"failure while setting up TLS session";
1476 /* TLS session is set up */
1478 for (addr = addrlist; addr != NULL; addr = addr->next)
1480 if (addr->transport_return == PENDING_DEFER)
1482 addr->cipher = tls_out.cipher;
1483 addr->ourcert = tls_out.ourcert;
1484 addr->peercert = tls_out.peercert;
1485 addr->peerdn = tls_out.peerdn;
1486 addr->ocsp = tls_out.ocsp;
1492 /* if smtps, we'll have smtp_command set to something else; always safe to
1494 smtp_command = big_buffer;
1496 /* If we started TLS, redo the EHLO/LHLO exchange over the secure channel. If
1497 helo_data is null, we are dealing with a connection that was passed from
1498 another process, and so we won't have expanded helo_data above. We have to
1499 expand it here. $sending_ip_address and $sending_port are set up right at the
1500 start of the Exim process (in exim.c). */
1502 if (tls_out.active >= 0)
1505 if (helo_data == NULL)
1507 helo_data = expand_string(ob->helo_data);
1508 if (helo_data == NULL)
1510 uschar *message = string_sprintf("failed to expand helo_data: %s",
1511 expand_string_message);
1512 set_errno(addrlist, 0, message, DEFER, FALSE);
1518 /* For SMTPS we need to wait for the initial OK response. */
1521 if (!smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
1522 ob->command_timeout)) goto RESPONSE_FAILED;
1526 greeting_cmd = "EHLO";
1529 greeting_cmd = "HELO";
1531 debug_printf("not sending EHLO (host matches hosts_avoid_esmtp)\n");
1534 if (smtp_write_command(&outblock, FALSE, "%s %s\r\n",
1535 lmtp? "LHLO" : greeting_cmd, helo_data) < 0)
1537 if (!smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
1538 ob->command_timeout))
1539 goto RESPONSE_FAILED;
1542 /* If the host is required to use a secure channel, ensure that we
1545 else if (verify_check_this_host(&(ob->hosts_require_tls), NULL, host->name,
1546 host->address, NULL) == OK)
1548 save_errno = ERRNO_TLSREQUIRED;
1549 message = string_sprintf("a TLS session is required for %s [%s], but %s",
1550 host->name, host->address,
1551 tls_offered? "an attempt to start TLS failed" :
1552 "the server did not offer TLS support");
1557 /* If TLS is active, we have just started it up and re-done the EHLO command,
1558 so its response needs to be analyzed. If TLS is not active and this is a
1559 continued session down a previously-used socket, we haven't just done EHLO, so
1562 if (continue_hostname == NULL
1564 || tls_out.active >= 0
1568 /* Set for IGNOREQUOTA if the response to LHLO specifies support and the
1569 lmtp_ignore_quota option was set. */
1571 igquotstr = (lmtp && ob->lmtp_ignore_quota &&
1572 pcre_exec(regex_IGNOREQUOTA, NULL, CS buffer, Ustrlen(CS buffer), 0,
1573 PCRE_EOPT, NULL, 0) >= 0)? US" IGNOREQUOTA" : US"";
1575 /* If the response to EHLO specified support for the SIZE parameter, note
1576 this, provided size_addition is non-negative. */
1578 smtp_use_size = esmtp && ob->size_addition >= 0 &&
1579 pcre_exec(regex_SIZE, NULL, CS buffer, Ustrlen(CS buffer), 0,
1580 PCRE_EOPT, NULL, 0) >= 0;
1582 /* Note whether the server supports PIPELINING. If hosts_avoid_esmtp matched
1583 the current host, esmtp will be false, so PIPELINING can never be used. If
1584 the current host matches hosts_avoid_pipelining, don't do it. */
1586 smtp_use_pipelining = esmtp &&
1587 verify_check_this_host(&(ob->hosts_avoid_pipelining), NULL, host->name,
1588 host->address, NULL) != OK &&
1589 pcre_exec(regex_PIPELINING, NULL, CS buffer, Ustrlen(CS buffer), 0,
1590 PCRE_EOPT, NULL, 0) >= 0;
1592 DEBUG(D_transport) debug_printf("%susing PIPELINING\n",
1593 smtp_use_pipelining? "" : "not ");
1595 #ifndef DISABLE_PRDR
1596 prdr_offered = esmtp &&
1597 pcre_exec(regex_PRDR, NULL, CS buffer, Ustrlen(CS buffer), 0,
1598 PCRE_EOPT, NULL, 0) >= 0 &&
1599 verify_check_this_host(&(ob->hosts_try_prdr), NULL, host->name,
1600 host->address, NULL) == OK;
1603 {DEBUG(D_transport) debug_printf("PRDR usable\n");}
1606 /* Note if the response to EHLO specifies support for the AUTH extension.
1607 If it has, check that this host is one we want to authenticate to, and do
1608 the business. The host name and address must be available when the
1609 authenticator's client driver is running. */
1611 switch (yield = smtp_auth(buffer, sizeof(buffer), addrlist, host,
1612 ob, esmtp, &inblock, &outblock))
1614 default: goto SEND_QUIT;
1616 case FAIL_SEND: goto SEND_FAILED;
1617 case FAIL: goto RESPONSE_FAILED;
1621 /* The setting up of the SMTP call is now complete. Any subsequent errors are
1622 message-specific. */
1626 /* If there is a filter command specified for this transport, we can now
1627 set it up. This cannot be done until the identify of the host is known. */
1629 if (tblock->filter_command != NULL)
1633 sprintf(CS buffer, "%.50s transport", tblock->name);
1634 rc = transport_set_up_command(&transport_filter_argv, tblock->filter_command,
1635 TRUE, DEFER, addrlist, buffer, NULL);
1636 transport_filter_timeout = tblock->filter_timeout;
1638 /* On failure, copy the error to all addresses, abandon the SMTP call, and
1643 set_errno(addrlist->next, addrlist->basic_errno, addrlist->message, DEFER,
1651 /* For messages that have more than the maximum number of envelope recipients,
1652 we want to send several transactions down the same SMTP connection. (See
1653 comments in deliver.c as to how this reconciles, heuristically, with
1654 remote_max_parallel.) This optimization was added to Exim after the following
1655 code was already working. The simplest way to put it in without disturbing the
1656 code was to use a goto to jump back to this point when there is another
1657 transaction to handle. */
1660 sync_addr = first_addr;
1664 completed_address = FALSE;
1667 /* Initiate a message transfer. If we know the receiving MTA supports the SIZE
1668 qualification, send it, adding something to the message size to allow for
1669 imprecision and things that get added en route. Exim keeps the number of lines
1670 in a message, so we can give an accurate value for the original message, but we
1671 need some additional to handle added headers. (Double "." characters don't get
1672 included in the count.) */
1679 sprintf(CS p, " SIZE=%d", message_size+message_linecount+ob->size_addition);
1683 #ifndef DISABLE_PRDR
1684 prdr_active = FALSE;
1687 for (addr = first_addr; addr; addr = addr->next)
1688 if (addr->transport_return == PENDING_DEFER)
1690 for (addr = addr->next; addr; addr = addr->next)
1691 if (addr->transport_return == PENDING_DEFER)
1692 { /* at least two recipients to send */
1694 sprintf(CS p, " PRDR"); p += 5;
1695 goto prdr_is_active;
1703 /* If an authenticated_sender override has been specified for this transport
1704 instance, expand it. If the expansion is forced to fail, and there was already
1705 an authenticated_sender for this message, the original value will be used.
1706 Other expansion failures are serious. An empty result is ignored, but there is
1707 otherwise no check - this feature is expected to be used with LMTP and other
1708 cases where non-standard addresses (e.g. without domains) might be required. */
1710 if (smtp_mail_auth_str(p, sizeof(buffer) - (p-buffer), addrlist, ob))
1713 /* From here until we send the DATA command, we can make use of PIPELINING
1714 if the server host supports it. The code has to be able to check the responses
1715 at any point, for when the buffer fills up, so we write it totally generally.
1716 When PIPELINING is off, each command written reports that it has flushed the
1719 pending_MAIL = TRUE; /* The block starts with MAIL */
1721 rc = smtp_write_command(&outblock, smtp_use_pipelining,
1722 "MAIL FROM:<%s>%s\r\n", return_path, buffer);
1723 mail_command = string_copy(big_buffer); /* Save for later error message */
1727 case -1: /* Transmission error */
1730 case +1: /* Block was sent */
1731 if (!smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
1732 ob->command_timeout))
1734 if (errno == 0 && buffer[0] == '4')
1736 errno = ERRNO_MAIL4XX;
1737 addrlist->more_errno |= ((buffer[1] - '0')*10 + buffer[2] - '0') << 8;
1739 goto RESPONSE_FAILED;
1741 pending_MAIL = FALSE;
1745 /* Pass over all the relevant recipient addresses for this host, which are the
1746 ones that have status PENDING_DEFER. If we are using PIPELINING, we can send
1747 several before we have to read the responses for those seen so far. This
1748 checking is done by a subroutine because it also needs to be done at the end.
1749 Send only up to max_rcpt addresses at a time, leaving first_addr pointing to
1750 the next one if not all are sent.
1752 In the MUA wrapper situation, we want to flush the PIPELINING buffer for the
1753 last address because we want to abort if any recipients have any kind of
1754 problem, temporary or permanent. We know that all recipient addresses will have
1755 the PENDING_DEFER status, because only one attempt is ever made, and we know
1756 that max_rcpt will be large, so all addresses will be done at once. */
1758 for (addr = first_addr;
1759 address_count < max_rcpt && addr != NULL;
1765 if (addr->transport_return != PENDING_DEFER) continue;
1768 no_flush = smtp_use_pipelining && (!mua_wrapper || addr->next != NULL);
1770 /* Now send the RCPT command, and process outstanding responses when
1771 necessary. After a timeout on RCPT, we just end the function, leaving the
1772 yield as OK, because this error can often mean that there is a problem with
1773 just one address, so we don't want to delay the host. */
1775 count = smtp_write_command(&outblock, no_flush, "RCPT TO:<%s>%s\r\n",
1776 transport_rcpt_address(addr, tblock->rcpt_include_affixes), igquotstr);
1777 if (count < 0) goto SEND_FAILED;
1780 switch(sync_responses(first_addr, tblock->rcpt_include_affixes,
1781 &sync_addr, host, count, ob->address_retry_include_sender,
1782 pending_MAIL, 0, &inblock, ob->command_timeout, buffer,
1785 case 3: ok = TRUE; /* 2xx & 5xx => OK & progress made */
1786 case 2: completed_address = TRUE; /* 5xx (only) => progress made */
1789 case 1: ok = TRUE; /* 2xx (only) => OK, but if LMTP, */
1790 if (!lmtp) completed_address = TRUE; /* can't tell about progress yet */
1791 case 0: /* No 2xx or 5xx, but no probs */
1794 case -1: goto END_OFF; /* Timeout on RCPT */
1795 default: goto RESPONSE_FAILED; /* I/O error, or any MAIL error */
1797 pending_MAIL = FALSE; /* Dealt with MAIL */
1799 } /* Loop for next address */
1801 /* If we are an MUA wrapper, abort if any RCPTs were rejected, either
1802 permanently or temporarily. We should have flushed and synced after the last
1807 address_item *badaddr;
1808 for (badaddr = first_addr; badaddr != NULL; badaddr = badaddr->next)
1810 if (badaddr->transport_return != PENDING_OK) break;
1812 if (badaddr != NULL)
1814 set_errno(addrlist, 0, badaddr->message, FAIL,
1815 testflag(badaddr, af_pass_message));
1820 /* If ok is TRUE, we know we have got at least one good recipient, and must now
1821 send DATA, but if it is FALSE (in the normal, non-wrapper case), we may still
1822 have a good recipient buffered up if we are pipelining. We don't want to waste
1823 time sending DATA needlessly, so we only send it if either ok is TRUE or if we
1824 are pipelining. The responses are all handled by sync_responses(). */
1826 if (ok || (smtp_use_pipelining && !mua_wrapper))
1828 int count = smtp_write_command(&outblock, FALSE, "DATA\r\n");
1829 if (count < 0) goto SEND_FAILED;
1830 switch(sync_responses(first_addr, tblock->rcpt_include_affixes, &sync_addr,
1831 host, count, ob->address_retry_include_sender, pending_MAIL,
1832 ok? +1 : -1, &inblock, ob->command_timeout, buffer, sizeof(buffer)))
1834 case 3: ok = TRUE; /* 2xx & 5xx => OK & progress made */
1835 case 2: completed_address = TRUE; /* 5xx (only) => progress made */
1838 case 1: ok = TRUE; /* 2xx (only) => OK, but if LMTP, */
1839 if (!lmtp) completed_address = TRUE; /* can't tell about progress yet */
1840 case 0: break; /* No 2xx or 5xx, but no probs */
1842 case -1: goto END_OFF; /* Timeout on RCPT */
1843 default: goto RESPONSE_FAILED; /* I/O error, or any MAIL/DATA error */
1847 /* Save the first address of the next batch. */
1851 /* If there were no good recipients (but otherwise there have been no
1852 problems), just set ok TRUE, since we have handled address-specific errors
1853 already. Otherwise, it's OK to send the message. Use the check/escape mechanism
1854 for handling the SMTP dot-handling protocol, flagging to apply to headers as
1855 well as body. Set the appropriate timeout value to be used for each chunk.
1856 (Haven't been able to make it work using select() for writing yet.) */
1858 if (!ok) ok = TRUE; else
1860 sigalrm_seen = FALSE;
1861 transport_write_timeout = ob->data_timeout;
1862 smtp_command = US"sending data block"; /* For error messages */
1863 DEBUG(D_transport|D_v)
1864 debug_printf(" SMTP>> writing message and terminating \".\"\n");
1865 transport_count = 0;
1866 #ifndef DISABLE_DKIM
1867 ok = dkim_transport_write_message(addrlist, inblock.sock,
1868 topt_use_crlf | topt_end_dot | topt_escape_headers |
1869 (tblock->body_only? topt_no_headers : 0) |
1870 (tblock->headers_only? topt_no_body : 0) |
1871 (tblock->return_path_add? topt_add_return_path : 0) |
1872 (tblock->delivery_date_add? topt_add_delivery_date : 0) |
1873 (tblock->envelope_to_add? topt_add_envelope_to : 0),
1874 0, /* No size limit */
1875 tblock->add_headers, tblock->remove_headers,
1876 US".", US"..", /* Escaping strings */
1877 tblock->rewrite_rules, tblock->rewrite_existflags,
1878 ob->dkim_private_key, ob->dkim_domain, ob->dkim_selector,
1879 ob->dkim_canon, ob->dkim_strict, ob->dkim_sign_headers
1882 ok = transport_write_message(addrlist, inblock.sock,
1883 topt_use_crlf | topt_end_dot | topt_escape_headers |
1884 (tblock->body_only? topt_no_headers : 0) |
1885 (tblock->headers_only? topt_no_body : 0) |
1886 (tblock->return_path_add? topt_add_return_path : 0) |
1887 (tblock->delivery_date_add? topt_add_delivery_date : 0) |
1888 (tblock->envelope_to_add? topt_add_envelope_to : 0),
1889 0, /* No size limit */
1890 tblock->add_headers, tblock->remove_headers,
1891 US".", US"..", /* Escaping strings */
1892 tblock->rewrite_rules, tblock->rewrite_existflags);
1895 /* transport_write_message() uses write() because it is called from other
1896 places to write to non-sockets. This means that under some OS (e.g. Solaris)
1897 it can exit with "Broken pipe" as its error. This really means that the
1898 socket got closed at the far end. */
1900 transport_write_timeout = 0; /* for subsequent transports */
1902 /* Failure can either be some kind of I/O disaster (including timeout),
1903 or the failure of a transport filter or the expansion of added headers. */
1907 buffer[0] = 0; /* There hasn't been a response */
1908 goto RESPONSE_FAILED;
1911 /* We used to send the terminating "." explicitly here, but because of
1912 buffering effects at both ends of TCP/IP connections, you don't gain
1913 anything by keeping it separate, so it might as well go in the final
1914 data buffer for efficiency. This is now done by setting the topt_end_dot
1917 smtp_command = US"end of data";
1919 #ifndef DISABLE_PRDR
1920 /* For PRDR we optionally get a partial-responses warning
1921 * followed by the individual responses, before going on with
1922 * the overall response. If we don't get the warning then deal
1923 * with per non-PRDR. */
1926 ok = smtp_read_response(&inblock, buffer, sizeof(buffer), '3',
1928 if (!ok && errno == 0)
1931 case '2': prdr_active = FALSE;
1934 case '4': errno = ERRNO_DATA4XX;
1935 addrlist->more_errno |= ((buffer[1] - '0')*10 + buffer[2] - '0') << 8;
1942 /* For non-PRDR SMTP, we now read a single response that applies to the
1943 whole message. If it is OK, then all the addresses have been delivered. */
1947 ok = smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
1949 if (!ok && errno == 0 && buffer[0] == '4')
1951 errno = ERRNO_DATA4XX;
1952 addrlist->more_errno |= ((buffer[1] - '0')*10 + buffer[2] - '0') << 8;
1956 /* For LMTP, we get back a response for every RCPT command that we sent;
1957 some may be accepted and some rejected. For those that get a response, their
1958 status is fixed; any that are accepted have been handed over, even if later
1959 responses crash - at least, that's how I read RFC 2033.
1961 If all went well, mark the recipient addresses as completed, record which
1962 host/IPaddress they were delivered to, and cut out RSET when sending another
1963 message down the same channel. Write the completed addresses to the journal
1964 now so that they are recorded in case there is a crash of hardware or
1965 software before the spool gets updated. Also record the final SMTP
1966 confirmation if needed (for SMTP only). */
1971 int delivery_time = (int)(time(NULL) - start_delivery_time);
1974 uschar *conf = NULL;
1977 /* Make a copy of the host if it is local to this invocation
1978 of the transport. */
1982 thost = store_get(sizeof(host_item));
1984 thost->name = string_copy(host->name);
1985 thost->address = string_copy(host->address);
1989 /* Set up confirmation if needed - applies only to SMTP */
1992 #ifndef EXPERIMENTAL_TPDA
1993 (log_extra_selector & LX_smtp_confirmation) != 0 &&
1998 uschar *s = string_printing(buffer);
1999 conf = (s == buffer)? (uschar *)string_copy(s) : s;
2002 /* Process all transported addresses - for LMTP or PRDR, read a status for
2005 for (addr = addrlist; addr != first_addr; addr = addr->next)
2007 if (addr->transport_return != PENDING_OK) continue;
2009 /* LMTP - if the response fails badly (e.g. timeout), use it for all the
2010 remaining addresses. Otherwise, it's a return code for just the one
2011 address. For temporary errors, add a retry item for the address so that
2012 it doesn't get tried again too soon. */
2014 #ifndef DISABLE_PRDR
2015 if (lmtp || prdr_active)
2020 if (!smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
2023 if (errno != 0 || buffer[0] == 0) goto RESPONSE_FAILED;
2024 addr->message = string_sprintf(
2025 #ifndef DISABLE_PRDR
2026 "%s error after %s: %s", prdr_active ? "PRDR":"LMTP",
2028 "LMTP error after %s: %s",
2030 big_buffer, string_printing(buffer));
2031 setflag(addr, af_pass_message); /* Allow message to go to user */
2032 if (buffer[0] == '5')
2033 addr->transport_return = FAIL;
2036 errno = ERRNO_DATA4XX;
2037 addr->more_errno |= ((buffer[1] - '0')*10 + buffer[2] - '0') << 8;
2038 addr->transport_return = DEFER;
2039 #ifndef DISABLE_PRDR
2042 retry_add_item(addr, addr->address_retry_key, 0);
2046 completed_address = TRUE; /* NOW we can set this flag */
2047 if ((log_extra_selector & LX_smtp_confirmation) != 0)
2049 uschar *s = string_printing(buffer);
2050 conf = (s == buffer)? (uschar *)string_copy(s) : s;
2054 /* SMTP, or success return from LMTP for this address. Pass back the
2055 actual host that was used. */
2057 addr->transport_return = OK;
2058 addr->more_errno = delivery_time;
2059 addr->host_used = thost;
2060 addr->special_action = flag;
2061 addr->message = conf;
2062 #ifndef DISABLE_PRDR
2063 if (prdr_active) addr->flags |= af_prdr_used;
2067 #ifndef DISABLE_PRDR
2071 /* Update the journal. For homonymic addresses, use the base address plus
2072 the transport name. See lots of comments in deliver.c about the reasons
2073 for the complications when homonyms are involved. Just carry on after
2074 write error, as it may prove possible to update the spool file later. */
2076 if (testflag(addr, af_homonym))
2077 sprintf(CS buffer, "%.500s/%s\n", addr->unique + 3, tblock->name);
2079 sprintf(CS buffer, "%.500s\n", addr->unique);
2081 DEBUG(D_deliver) debug_printf("journalling %s", buffer);
2082 len = Ustrlen(CS buffer);
2083 if (write(journal_fd, buffer, len) != len)
2084 log_write(0, LOG_MAIN|LOG_PANIC, "failed to write journal for "
2085 "%s: %s", buffer, strerror(errno));
2089 #ifndef DISABLE_PRDR
2092 /* PRDR - get the final, overall response. For any non-success
2093 upgrade all the address statuses. */
2094 ok = smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
2098 if(errno == 0 && buffer[0] == '4')
2100 errno = ERRNO_DATA4XX;
2101 addrlist->more_errno |= ((buffer[1] - '0')*10 + buffer[2] - '0') << 8;
2103 for (addr = addrlist; addr != first_addr; addr = addr->next)
2104 if (buffer[0] == '5' || addr->transport_return == OK)
2105 addr->transport_return = PENDING_OK; /* allow set_errno action */
2106 goto RESPONSE_FAILED;
2109 /* Update the journal, or setup retry. */
2110 for (addr = addrlist; addr != first_addr; addr = addr->next)
2111 if (addr->transport_return == OK)
2113 if (testflag(addr, af_homonym))
2114 sprintf(CS buffer, "%.500s/%s\n", addr->unique + 3, tblock->name);
2116 sprintf(CS buffer, "%.500s\n", addr->unique);
2118 DEBUG(D_deliver) debug_printf("journalling(PRDR) %s", buffer);
2119 len = Ustrlen(CS buffer);
2120 if (write(journal_fd, buffer, len) != len)
2121 log_write(0, LOG_MAIN|LOG_PANIC, "failed to write journal for "
2122 "%s: %s", buffer, strerror(errno));
2124 else if (addr->transport_return == DEFER)
2125 retry_add_item(addr, addr->address_retry_key, -2);
2129 /* Ensure the journal file is pushed out to disk. */
2131 if (EXIMfsync(journal_fd) < 0)
2132 log_write(0, LOG_MAIN|LOG_PANIC, "failed to fsync journal: %s",
2138 /* Handle general (not specific to one address) failures here. The value of ok
2139 is used to skip over this code on the falling through case. A timeout causes a
2140 deferral. Other errors may defer or fail according to the response code, and
2141 may set up a special errno value, e.g. after connection chopped, which is
2142 assumed if errno == 0 and there is no text in the buffer. If control reaches
2143 here during the setting up phase (i.e. before MAIL FROM) then always defer, as
2144 the problem is not related to this specific message. */
2153 send_quit = check_response(host, &save_errno, addrlist->more_errno,
2154 buffer, &code, &message, &pass_message);
2160 message = US string_sprintf("send() to %s [%s] failed: %s",
2161 host->name, host->address, strerror(save_errno));
2165 /* This label is jumped to directly when a TLS negotiation has failed,
2166 or was not done for a host for which it is required. Values will be set
2167 in message and save_errno, and setting_up will always be true. Treat as
2168 a temporary error. */
2175 /* If the failure happened while setting up the call, see if the failure was
2176 a 5xx response (this will either be on connection, or following HELO - a 5xx
2177 after EHLO causes it to try HELO). If so, fail all addresses, as this host is
2178 never going to accept them. For other errors during setting up (timeouts or
2179 whatever), defer all addresses, and yield DEFER, so that the host is not
2180 tried again for a while. */
2183 ok = FALSE; /* For when reached by GOTO */
2189 set_errno(addrlist, save_errno, message, FAIL, pass_message);
2193 set_errno(addrlist, save_errno, message, DEFER, pass_message);
2198 /* We want to handle timeouts after MAIL or "." and loss of connection after
2199 "." specially. They can indicate a problem with the sender address or with
2200 the contents of the message rather than a real error on the connection. These
2201 cases are treated in the same way as a 4xx response. This next bit of code
2202 does the classification. */
2213 message_error = TRUE;
2217 message_error = Ustrncmp(smtp_command,"MAIL",4) == 0 ||
2218 Ustrncmp(smtp_command,"end ",4) == 0;
2221 case ERRNO_SMTPCLOSED:
2222 message_error = Ustrncmp(smtp_command,"end ",4) == 0;
2226 message_error = FALSE;
2230 /* Handle the cases that are treated as message errors. These are:
2232 (a) negative response or timeout after MAIL
2233 (b) negative response after DATA
2234 (c) negative response or timeout or dropped connection after "."
2236 It won't be a negative response or timeout after RCPT, as that is dealt
2237 with separately above. The action in all cases is to set an appropriate
2238 error code for all the addresses, but to leave yield set to OK because the
2239 host itself has not failed. Of course, it might in practice have failed
2240 when we've had a timeout, but if so, we'll discover that at the next
2241 delivery attempt. For a temporary error, set the message_defer flag, and
2242 write to the logs for information if this is not the last host. The error
2243 for the last host will be logged as part of the address's log line. */
2247 if (mua_wrapper) code = '5'; /* Force hard failure in wrapper mode */
2248 set_errno(addrlist, save_errno, message, (code == '5')? FAIL : DEFER,
2251 /* If there's an errno, the message contains just the identity of
2254 if (code != '5') /* Anything other than 5 is treated as temporary */
2257 message = US string_sprintf("%s: %s", message, strerror(save_errno));
2258 if (host->next != NULL) log_write(0, LOG_MAIN, "%s", message);
2259 deliver_msglog("%s %s\n", tod_stamp(tod_log), message);
2260 *message_defer = TRUE;
2264 /* Otherwise, we have an I/O error or a timeout other than after MAIL or
2265 ".", or some other transportation error. We defer all addresses and yield
2266 DEFER, except for the case of failed add_headers expansion, or a transport
2267 filter failure, when the yield should be ERROR, to stop it trying other
2272 yield = (save_errno == ERRNO_CHHEADER_FAIL ||
2273 save_errno == ERRNO_FILTER_FAIL)? ERROR : DEFER;
2274 set_errno(addrlist, save_errno, message, DEFER, pass_message);
2280 /* If all has gone well, send_quit will be set TRUE, implying we can end the
2281 SMTP session tidily. However, if there were too many addresses to send in one
2282 message (indicated by first_addr being non-NULL) we want to carry on with the
2283 rest of them. Also, it is desirable to send more than one message down the SMTP
2284 connection if there are several waiting, provided we haven't already sent so
2285 many as to hit the configured limit. The function transport_check_waiting looks
2286 for a waiting message and returns its id. Then transport_pass_socket tries to
2287 set up a continued delivery by passing the socket on to another process. The
2288 variable send_rset is FALSE if a message has just been successfully transfered.
2290 If we are already sending down a continued channel, there may be further
2291 addresses not yet delivered that are aimed at the same host, but which have not
2292 been passed in this run of the transport. In this case, continue_more will be
2293 true, and all we should do is send RSET if necessary, and return, leaving the
2296 However, if no address was disposed of, i.e. all addresses got 4xx errors, we
2297 do not want to continue with other messages down the same channel, because that
2298 can lead to looping between two or more messages, all with the same,
2299 temporarily failing address(es). [The retry information isn't updated yet, so
2300 new processes keep on trying.] We probably also don't want to try more of this
2301 message's addresses either.
2303 If we have started a TLS session, we have to end it before passing the
2304 connection to a new process. However, not all servers can handle this (Exim
2305 can), so we do not pass such a connection on if the host matches
2306 hosts_nopass_tls. */
2309 debug_printf("ok=%d send_quit=%d send_rset=%d continue_more=%d "
2310 "yield=%d first_address is %sNULL\n", ok, send_quit, send_rset,
2311 continue_more, yield, (first_addr == NULL)? "":"not ");
2313 if (completed_address && ok && send_quit)
2316 if (first_addr != NULL || continue_more ||
2318 (tls_out.active < 0 ||
2319 verify_check_this_host(&(ob->hosts_nopass_tls), NULL, host->name,
2320 host->address, NULL) != OK)
2322 transport_check_waiting(tblock->name, host->name,
2323 tblock->connection_max_messages, new_message_id, &more)
2331 if (! (ok = smtp_write_command(&outblock, FALSE, "RSET\r\n") >= 0))
2333 msg = US string_sprintf("send() to %s [%s] failed: %s", host->name,
2334 host->address, strerror(save_errno));
2337 else if (! (ok = smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
2338 ob->command_timeout)))
2341 send_quit = check_response(host, &errno, 0, buffer, &code, &msg,
2345 DEBUG(D_transport) debug_printf("%s\n", msg);
2350 /* Either RSET was not needed, or it succeeded */
2354 if (first_addr != NULL) /* More addresses still to be sent */
2355 { /* in this run of the transport */
2356 continue_sequence++; /* Causes * in logging */
2359 if (continue_more) return yield; /* More addresses for another run */
2361 /* Pass the socket to a new Exim process. Before doing so, we must shut
2362 down TLS. Not all MTAs allow for the continuation of the SMTP session
2363 when TLS is shut down. We test for this by sending a new EHLO. If we
2364 don't get a good response, we don't attempt to pass the socket on. */
2367 if (tls_out.active >= 0)
2369 tls_close(FALSE, TRUE);
2373 ok = smtp_write_command(&outblock,FALSE,"EHLO %s\r\n",helo_data) >= 0 &&
2374 smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
2375 ob->command_timeout);
2379 /* If the socket is successfully passed, we musn't send QUIT (or
2380 indeed anything!) from here. */
2382 if (ok && transport_pass_socket(tblock->name, host->name, host->address,
2383 new_message_id, inblock.sock))
2389 /* If RSET failed and there are addresses left, they get deferred. */
2391 else set_errno(first_addr, errno, msg, DEFER, FALSE);
2395 /* End off tidily with QUIT unless the connection has died or the socket has
2396 been passed to another process. There has been discussion on the net about what
2397 to do after sending QUIT. The wording of the RFC suggests that it is necessary
2398 to wait for a response, but on the other hand, there isn't anything one can do
2399 with an error response, other than log it. Exim used to do that. However,
2400 further discussion suggested that it is positively advantageous not to wait for
2401 the response, but to close the session immediately. This is supposed to move
2402 the TCP/IP TIME_WAIT state from the server to the client, thereby removing some
2403 load from the server. (Hosts that are both servers and clients may not see much
2404 difference, of course.) Further discussion indicated that this was safe to do
2405 on Unix systems which have decent implementations of TCP/IP that leave the
2406 connection around for a while (TIME_WAIT) after the application has gone away.
2407 This enables the response sent by the server to be properly ACKed rather than
2408 timed out, as can happen on broken TCP/IP implementations on other OS.
2410 This change is being made on 31-Jul-98. After over a year of trouble-free
2411 operation, the old commented-out code was removed on 17-Sep-99. */
2414 if (send_quit) (void)smtp_write_command(&outblock, FALSE, "QUIT\r\n");
2419 tls_close(FALSE, TRUE);
2422 /* Close the socket, and return the appropriate value, first setting
2423 works because the NULL setting is passed back to the calling process, and
2424 remote_max_parallel is forced to 1 when delivering over an existing connection,
2426 If all went well and continue_more is set, we shouldn't actually get here if
2427 there are further addresses, as the return above will be taken. However,
2428 writing RSET might have failed, or there may be other addresses whose hosts are
2429 specified in the transports, and therefore not visible at top level, in which
2430 case continue_more won't get set. */
2432 (void)close(inblock.sock);
2433 continue_transport = NULL;
2434 continue_hostname = NULL;
2441 /*************************************************
2442 * Closedown entry point *
2443 *************************************************/
2445 /* This function is called when exim is passed an open smtp channel
2446 from another incarnation, but the message which it has been asked
2447 to deliver no longer exists. The channel is on stdin.
2449 We might do fancy things like looking for another message to send down
2450 the channel, but if the one we sought has gone, it has probably been
2451 delivered by some other process that itself will seek further messages,
2452 so just close down our connection.
2454 Argument: pointer to the transport instance block
2459 smtp_transport_closedown(transport_instance *tblock)
2461 smtp_transport_options_block *ob =
2462 (smtp_transport_options_block *)(tblock->options_block);
2463 smtp_inblock inblock;
2464 smtp_outblock outblock;
2466 uschar inbuffer[4096];
2467 uschar outbuffer[16];
2469 inblock.sock = fileno(stdin);
2470 inblock.buffer = inbuffer;
2471 inblock.buffersize = sizeof(inbuffer);
2472 inblock.ptr = inbuffer;
2473 inblock.ptrend = inbuffer;
2475 outblock.sock = inblock.sock;
2476 outblock.buffersize = sizeof(outbuffer);
2477 outblock.buffer = outbuffer;
2478 outblock.ptr = outbuffer;
2479 outblock.cmd_count = 0;
2480 outblock.authenticating = FALSE;
2482 (void)smtp_write_command(&outblock, FALSE, "QUIT\r\n");
2483 (void)smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
2484 ob->command_timeout);
2485 (void)close(inblock.sock);
2490 /*************************************************
2491 * Prepare addresses for delivery *
2492 *************************************************/
2494 /* This function is called to flush out error settings from previous delivery
2495 attempts to other hosts. It also records whether we got here via an MX record
2496 or not in the more_errno field of the address. We are interested only in
2497 addresses that are still marked DEFER - others may have got delivered to a
2498 previously considered IP address. Set their status to PENDING_DEFER to indicate
2499 which ones are relevant this time.
2502 addrlist the list of addresses
2503 host the host we are delivering to
2505 Returns: the first address for this delivery
2508 static address_item *
2509 prepare_addresses(address_item *addrlist, host_item *host)
2511 address_item *first_addr = NULL;
2513 for (addr = addrlist; addr != NULL; addr = addr->next)
2515 if (addr->transport_return != DEFER) continue;
2516 if (first_addr == NULL) first_addr = addr;
2517 addr->transport_return = PENDING_DEFER;
2518 addr->basic_errno = 0;
2519 addr->more_errno = (host->mx >= 0)? 'M' : 'A';
2520 addr->message = NULL;
2522 addr->cipher = NULL;
2523 addr->ourcert = NULL;
2524 addr->peercert = NULL;
2525 addr->peerdn = NULL;
2526 addr->ocsp = OCSP_NOT_REQ;
2534 /*************************************************
2535 * Main entry point *
2536 *************************************************/
2538 /* See local README for interface details. As this is a remote transport, it is
2539 given a chain of addresses to be delivered in one connection, if possible. It
2540 always returns TRUE, indicating that each address has its own independent
2541 status set, except if there is a setting up problem, in which case it returns
2545 smtp_transport_entry(
2546 transport_instance *tblock, /* data for this instantiation */
2547 address_item *addrlist) /* addresses we are working on */
2551 int hosts_defer = 0;
2553 int hosts_looked_up = 0;
2554 int hosts_retry = 0;
2555 int hosts_serial = 0;
2556 int hosts_total = 0;
2557 int total_hosts_tried = 0;
2559 BOOL expired = TRUE;
2560 BOOL continuing = continue_hostname != NULL;
2561 uschar *expanded_hosts = NULL;
2563 uschar *tid = string_sprintf("%s transport", tblock->name);
2564 smtp_transport_options_block *ob =
2565 (smtp_transport_options_block *)(tblock->options_block);
2566 host_item *hostlist = addrlist->host_list;
2567 host_item *host = NULL;
2571 debug_printf("%s transport entered\n", tblock->name);
2572 for (addr = addrlist; addr != NULL; addr = addr->next)
2573 debug_printf(" %s\n", addr->address);
2574 if (continuing) debug_printf("already connected to %s [%s]\n",
2575 continue_hostname, continue_host_address);
2578 /* Set the flag requesting that these hosts be added to the waiting
2579 database if the delivery fails temporarily or if we are running with
2580 queue_smtp or a 2-stage queue run. This gets unset for certain
2581 kinds of error, typically those that are specific to the message. */
2583 update_waiting = TRUE;
2585 /* If a host list is not defined for the addresses - they must all have the
2586 same one in order to be passed to a single transport - or if the transport has
2587 a host list with hosts_override set, use the host list supplied with the
2588 transport. It is an error for this not to exist. */
2590 if (hostlist == NULL || (ob->hosts_override && ob->hosts != NULL))
2592 if (ob->hosts == NULL)
2594 addrlist->message = string_sprintf("%s transport called with no hosts set",
2596 addrlist->transport_return = PANIC;
2597 return FALSE; /* Only top address has status */
2600 DEBUG(D_transport) debug_printf("using the transport's hosts: %s\n",
2603 /* If the transport's host list contains no '$' characters, and we are not
2604 randomizing, it is fixed and therefore a chain of hosts can be built once
2605 and for all, and remembered for subsequent use by other calls to this
2606 transport. If, on the other hand, the host list does contain '$', or we are
2607 randomizing its order, we have to rebuild it each time. In the fixed case,
2608 as the hosts string will never be used again, it doesn't matter that we
2609 replace all the : characters with zeros. */
2611 if (ob->hostlist == NULL)
2613 uschar *s = ob->hosts;
2615 if (Ustrchr(s, '$') != NULL)
2617 expanded_hosts = expand_string(s);
2618 if (expanded_hosts == NULL)
2620 addrlist->message = string_sprintf("failed to expand list of hosts "
2621 "\"%s\" in %s transport: %s", s, tblock->name, expand_string_message);
2622 addrlist->transport_return = search_find_defer? DEFER : PANIC;
2623 return FALSE; /* Only top address has status */
2625 DEBUG(D_transport) debug_printf("expanded list of hosts \"%s\" to "
2626 "\"%s\"\n", s, expanded_hosts);
2630 if (ob->hosts_randomize) s = expanded_hosts = string_copy(s);
2632 host_build_hostlist(&hostlist, s, ob->hosts_randomize);
2634 /* Check that the expansion yielded something useful. */
2635 if (hostlist == NULL)
2638 string_sprintf("%s transport has empty hosts setting", tblock->name);
2639 addrlist->transport_return = PANIC;
2640 return FALSE; /* Only top address has status */
2643 /* If there was no expansion of hosts, save the host list for
2646 if (expanded_hosts == NULL) ob->hostlist = hostlist;
2649 /* This is not the first time this transport has been run in this delivery;
2650 the host list was built previously. */
2652 else hostlist = ob->hostlist;
2655 /* The host list was supplied with the address. If hosts_randomize is set, we
2656 must sort it into a random order if it did not come from MX records and has not
2657 already been randomized (but don't bother if continuing down an existing
2660 else if (ob->hosts_randomize && hostlist->mx == MX_NONE && !continuing)
2662 host_item *newlist = NULL;
2663 while (hostlist != NULL)
2665 host_item *h = hostlist;
2666 hostlist = hostlist->next;
2668 h->sort_key = random_number(100);
2670 if (newlist == NULL)
2675 else if (h->sort_key < newlist->sort_key)
2682 host_item *hh = newlist;
2683 while (hh->next != NULL)
2685 if (h->sort_key < hh->next->sort_key) break;
2693 hostlist = addrlist->host_list = newlist;
2697 /* Sort out the default port. */
2699 if (!smtp_get_port(ob->port, addrlist, &port, tid)) return FALSE;
2702 /* For each host-plus-IP-address on the list:
2704 . If this is a continued delivery and the host isn't the one with the
2705 current connection, skip.
2707 . If the status is unusable (i.e. previously failed or retry checked), skip.
2709 . If no IP address set, get the address, either by turning the name into
2710 an address, calling gethostbyname if gethostbyname is on, or by calling
2711 the DNS. The DNS may yield multiple addresses, in which case insert the
2712 extra ones into the list.
2714 . Get the retry data if not previously obtained for this address and set the
2715 field which remembers the state of this address. Skip if the retry time is
2716 not reached. If not, remember whether retry data was found. The retry string
2717 contains both the name and the IP address.
2719 . Scan the list of addresses and mark those whose status is DEFER as
2720 PENDING_DEFER. These are the only ones that will be processed in this cycle
2723 . Make a delivery attempt - addresses marked PENDING_DEFER will be tried.
2724 Some addresses may be successfully delivered, others may fail, and yet
2725 others may get temporary errors and so get marked DEFER.
2727 . The return from the delivery attempt is OK if a connection was made and a
2728 valid SMTP dialogue was completed. Otherwise it is DEFER.
2730 . If OK, add a "remove" retry item for this host/IPaddress, if any.
2732 . If fail to connect, or other defer state, add a retry item.
2734 . If there are any addresses whose status is still DEFER, carry on to the
2735 next host/IPaddress, unless we have tried the number of hosts given
2736 by hosts_max_try or hosts_max_try_hardlimit; otherwise return. Note that
2737 there is some fancy logic for hosts_max_try that means its limit can be
2738 overstepped in some circumstances.
2740 If we get to the end of the list, all hosts have deferred at least one address,
2741 or not reached their retry times. If delay_after_cutoff is unset, it requests a
2742 delivery attempt to those hosts whose last try was before the arrival time of
2743 the current message. To cope with this, we have to go round the loop a second
2744 time. After that, set the status and error data for any addresses that haven't
2745 had it set already. */
2747 for (cutoff_retry = 0; expired &&
2748 cutoff_retry < ((ob->delay_after_cutoff)? 1 : 2);
2751 host_item *nexthost = NULL;
2752 int unexpired_hosts_tried = 0;
2754 for (host = hostlist;
2756 unexpired_hosts_tried < ob->hosts_max_try &&
2757 total_hosts_tried < ob->hosts_max_try_hardlimit;
2763 BOOL serialized = FALSE;
2764 BOOL host_is_expired = FALSE;
2765 BOOL message_defer = FALSE;
2766 BOOL ifchanges = FALSE;
2767 BOOL some_deferred = FALSE;
2768 address_item *first_addr = NULL;
2769 uschar *interface = NULL;
2770 uschar *retry_host_key = NULL;
2771 uschar *retry_message_key = NULL;
2772 uschar *serialize_key = NULL;
2774 /* Default next host is next host. :-) But this can vary if the
2775 hosts_max_try limit is hit (see below). It may also be reset if a host
2776 address is looked up here (in case the host was multihomed). */
2778 nexthost = host->next;
2780 /* If the address hasn't yet been obtained from the host name, look it up
2781 now, unless the host is already marked as unusable. If it is marked as
2782 unusable, it means that the router was unable to find its IP address (in
2783 the DNS or wherever) OR we are in the 2nd time round the cutoff loop, and
2784 the lookup failed last time. We don't get this far if *all* MX records
2785 point to non-existent hosts; that is treated as a hard error.
2787 We can just skip this host entirely. When the hosts came from the router,
2788 the address will timeout based on the other host(s); when the address is
2789 looked up below, there is an explicit retry record added.
2791 Note that we mustn't skip unusable hosts if the address is not unset; they
2792 may be needed as expired hosts on the 2nd time round the cutoff loop. */
2794 if (host->address == NULL)
2796 int new_port, flags;
2798 uschar *canonical_name;
2800 if (host->status >= hstatus_unusable)
2802 DEBUG(D_transport) debug_printf("%s has no address and is unusable - skipping\n",
2807 DEBUG(D_transport) debug_printf("getting address for %s\n", host->name);
2809 /* The host name is permitted to have an attached port. Find it, and
2810 strip it from the name. Just remember it for now. */
2812 new_port = host_item_get_port(host);
2814 /* Count hosts looked up */
2818 /* Find by name if so configured, or if it's an IP address. We don't
2819 just copy the IP address, because we need the test-for-local to happen. */
2821 flags = HOST_FIND_BY_A;
2822 if (ob->dns_qualify_single) flags |= HOST_FIND_QUALIFY_SINGLE;
2823 if (ob->dns_search_parents) flags |= HOST_FIND_SEARCH_PARENTS;
2825 if (ob->gethostbyname || string_is_ip_address(host->name, NULL) != 0)
2826 rc = host_find_byname(host, NULL, flags, &canonical_name, TRUE);
2828 rc = host_find_bydns(host, NULL, flags, NULL, NULL, NULL,
2829 ob->dnssec_request_domains, ob->dnssec_require_domains,
2830 &canonical_name, NULL);
2832 /* Update the host (and any additional blocks, resulting from
2833 multihoming) with a host-specific port, if any. */
2835 for (hh = host; hh != nexthost; hh = hh->next) hh->port = new_port;
2837 /* Failure to find the host at this time (usually DNS temporary failure)
2838 is really a kind of routing failure rather than a transport failure.
2839 Therefore we add a retry item of the routing kind, not to stop us trying
2840 to look this name up here again, but to ensure the address gets timed
2841 out if the failures go on long enough. A complete failure at this point
2842 commonly points to a configuration error, but the best action is still
2843 to carry on for the next host. */
2845 if (rc == HOST_FIND_AGAIN || rc == HOST_FIND_FAILED)
2847 retry_add_item(addrlist, string_sprintf("R:%s", host->name), 0);
2849 if (rc == HOST_FIND_AGAIN) hosts_defer++; else hosts_fail++;
2850 DEBUG(D_transport) debug_printf("rc = %s for %s\n", (rc == HOST_FIND_AGAIN)?
2851 "HOST_FIND_AGAIN" : "HOST_FIND_FAILED", host->name);
2852 host->status = hstatus_unusable;
2854 for (addr = addrlist; addr != NULL; addr = addr->next)
2856 if (addr->transport_return != DEFER) continue;
2857 addr->basic_errno = ERRNO_UNKNOWNHOST;
2859 string_sprintf("failed to lookup IP address for %s", host->name);
2864 /* If the host is actually the local host, we may have a problem, or
2865 there may be some cunning configuration going on. In the problem case,
2866 log things and give up. The default transport status is already DEFER. */
2868 if (rc == HOST_FOUND_LOCAL && !ob->allow_localhost)
2870 for (addr = addrlist; addr != NULL; addr = addr->next)
2872 addr->basic_errno = 0;
2873 addr->message = string_sprintf("%s transport found host %s to be "
2874 "local", tblock->name, host->name);
2878 } /* End of block for IP address lookup */
2880 /* If this is a continued delivery, we are interested only in the host
2881 which matches the name of the existing open channel. The check is put
2882 here after the local host lookup, in case the name gets expanded as a
2883 result of the lookup. Set expired FALSE, to save the outer loop executing
2886 if (continuing && (Ustrcmp(continue_hostname, host->name) != 0 ||
2887 Ustrcmp(continue_host_address, host->address) != 0))
2890 continue; /* With next host */
2893 /* Reset the default next host in case a multihomed host whose addresses
2894 are not looked up till just above added to the host list. */
2896 nexthost = host->next;
2898 /* If queue_smtp is set (-odqs or the first part of a 2-stage run), or the
2899 domain is in queue_smtp_domains, we don't actually want to attempt any
2900 deliveries. When doing a queue run, queue_smtp_domains is always unset. If
2901 there is a lookup defer in queue_smtp_domains, proceed as if the domain
2902 were not in it. We don't want to hold up all SMTP deliveries! Except when
2903 doing a two-stage queue run, don't do this if forcing. */
2905 if ((!deliver_force || queue_2stage) && (queue_smtp ||
2906 match_isinlist(addrlist->domain, &queue_smtp_domains, 0,
2907 &domainlist_anchor, NULL, MCL_DOMAIN, TRUE, NULL) == OK))
2910 for (addr = addrlist; addr != NULL; addr = addr->next)
2912 if (addr->transport_return != DEFER) continue;
2913 addr->message = US"domain matches queue_smtp_domains, or -odqs set";
2915 continue; /* With next host */
2918 /* Count hosts being considered - purely for an intelligent comment
2919 if none are usable. */
2923 /* Set $host and $host address now in case they are needed for the
2924 interface expansion or the serialize_hosts check; they remain set if an
2925 actual delivery happens. */
2927 deliver_host = host->name;
2928 deliver_host_address = host->address;
2929 lookup_dnssec_authenticated = host->dnssec == DS_YES ? US"yes"
2930 : host->dnssec == DS_NO ? US"no"
2933 /* Set up a string for adding to the retry key if the port number is not
2934 the standard SMTP port. A host may have its own port setting that overrides
2937 pistring = string_sprintf(":%d", (host->port == PORT_NONE)?
2939 if (Ustrcmp(pistring, ":25") == 0) pistring = US"";
2941 /* Select IPv4 or IPv6, and choose an outgoing interface. If the interface
2942 string changes upon expansion, we must add it to the key that is used for
2943 retries, because connections to the same host from a different interface
2944 should be treated separately. */
2946 host_af = (Ustrchr(host->address, ':') == NULL)? AF_INET : AF_INET6;
2947 if (!smtp_get_interface(ob->interface, host_af, addrlist, &ifchanges,
2950 if (ifchanges) pistring = string_sprintf("%s/%s", pistring, interface);
2952 /* The first time round the outer loop, check the status of the host by
2953 inspecting the retry data. The second time round, we are interested only
2954 in expired hosts that haven't been tried since this message arrived. */
2956 if (cutoff_retry == 0)
2958 /* Ensure the status of the address is set by checking retry data if
2959 necessary. There maybe host-specific retry data (applicable to all
2960 messages) and also data for retries of a specific message at this host.
2961 If either of these retry records are actually read, the keys used are
2962 returned to save recomputing them later. */
2964 host_is_expired = retry_check_address(addrlist->domain, host, pistring,
2965 ob->retry_include_ip_address, &retry_host_key, &retry_message_key);
2967 DEBUG(D_transport) debug_printf("%s [%s]%s status = %s\n", host->name,
2968 (host->address == NULL)? US"" : host->address, pistring,
2969 (host->status == hstatus_usable)? "usable" :
2970 (host->status == hstatus_unusable)? "unusable" :
2971 (host->status == hstatus_unusable_expired)? "unusable (expired)" : "?");
2973 /* Skip this address if not usable at this time, noting if it wasn't
2974 actually expired, both locally and in the address. */
2976 switch (host->status)
2978 case hstatus_unusable:
2980 setflag(addrlist, af_retry_skipped);
2983 case hstatus_unusable_expired:
2986 case hwhy_retry: hosts_retry++; break;
2987 case hwhy_failed: hosts_fail++; break;
2988 case hwhy_deferred: hosts_defer++; break;
2991 /* If there was a retry message key, implying that previously there
2992 was a message-specific defer, we don't want to update the list of
2993 messages waiting for these hosts. */
2995 if (retry_message_key != NULL) update_waiting = FALSE;
2996 continue; /* With the next host or IP address */
3000 /* Second time round the loop: if the address is set but expired, and
3001 the message is newer than the last try, let it through. */
3005 if (host->address == NULL ||
3006 host->status != hstatus_unusable_expired ||
3007 host->last_try > received_time)
3010 debug_printf("trying expired host %s [%s]%s\n",
3011 host->name, host->address, pistring);
3012 host_is_expired = TRUE;
3015 /* Setting "expired=FALSE" doesn't actually mean not all hosts are expired;
3016 it remains TRUE only if all hosts are expired and none are actually tried.
3021 /* If this host is listed as one to which access must be serialized,
3022 see if another Exim process has a connection to it, and if so, skip
3023 this host. If not, update the database to record our connection to it
3024 and remember this for later deletion. Do not do any of this if we are
3025 sending the message down a pre-existing connection. */
3028 verify_check_this_host(&(ob->serialize_hosts), NULL, host->name,
3029 host->address, NULL) == OK)
3031 serialize_key = string_sprintf("host-serialize-%s", host->name);
3032 if (!enq_start(serialize_key))
3035 debug_printf("skipping host %s because another Exim process "
3036 "is connected to it\n", host->name);
3043 /* OK, we have an IP address that is not waiting for its retry time to
3044 arrive (it might be expired) OR (second time round the loop) we have an
3045 expired host that hasn't been tried since the message arrived. Have a go
3046 at delivering the message to it. First prepare the addresses by flushing
3047 out the result of previous attempts, and finding the first address that
3048 is still to be delivered. */
3050 first_addr = prepare_addresses(addrlist, host);
3052 DEBUG(D_transport) debug_printf("delivering %s to %s [%s] (%s%s)\n",
3053 message_id, host->name, host->address, addrlist->address,
3054 (addrlist->next == NULL)? "" : ", ...");
3056 set_process_info("delivering %s to %s [%s] (%s%s)",
3057 message_id, host->name, host->address, addrlist->address,
3058 (addrlist->next == NULL)? "" : ", ...");
3060 /* This is not for real; don't do the delivery. If there are
3061 any remaining hosts, list them. */
3066 set_errno(addrlist, 0, NULL, OK, FALSE);
3067 for (addr = addrlist; addr != NULL; addr = addr->next)
3069 addr->host_used = host;
3070 addr->special_action = '*';
3071 addr->message = US"delivery bypassed by -N option";
3075 debug_printf("*** delivery by %s transport bypassed by -N option\n"
3076 "*** host and remaining hosts:\n", tblock->name);
3077 for (host2 = host; host2 != NULL; host2 = host2->next)
3078 debug_printf(" %s [%s]\n", host2->name,
3079 (host2->address == NULL)? US"unset" : host2->address);
3084 /* This is for real. If the host is expired, we don't count it for
3085 hosts_max_retry. This ensures that all hosts must expire before an address
3086 is timed out, unless hosts_max_try_hardlimit (which protects against
3087 lunatic DNS configurations) is reached.
3089 If the host is not expired and we are about to hit the hosts_max_retry
3090 limit, check to see if there is a subsequent hosts with a different MX
3091 value. If so, make that the next host, and don't count this one. This is a
3092 heuristic to make sure that different MXs do get tried. With a normal kind
3093 of retry rule, they would get tried anyway when the earlier hosts were
3094 delayed, but if the domain has a "retry every time" type of rule - as is
3095 often used for the the very large ISPs, that won't happen. */
3099 if (!host_is_expired && ++unexpired_hosts_tried >= ob->hosts_max_try)
3103 debug_printf("hosts_max_try limit reached with this host\n");
3104 for (h = host; h != NULL; h = h->next)
3105 if (h->mx != host->mx) break;
3109 unexpired_hosts_tried--;
3110 DEBUG(D_transport) debug_printf("however, a higher MX host exists "
3111 "and will be tried\n");
3115 /* Attempt the delivery. */
3117 total_hosts_tried++;
3118 rc = smtp_deliver(addrlist, host, host_af, port, interface, tblock,
3119 expanded_hosts != NULL, &message_defer, FALSE);
3122 OK => connection made, each address contains its result;
3123 message_defer is set for message-specific defers (when all
3124 recipients are marked defer)
3125 DEFER => there was a non-message-specific delivery problem;
3126 ERROR => there was a problem setting up the arguments for a filter,
3127 or there was a problem with expanding added headers
3130 /* If the result is not OK, there was a non-message-specific problem.
3131 If the result is DEFER, we need to write to the logs saying what happened
3132 for this particular host, except in the case of authentication and TLS
3133 failures, where the log has already been written. If all hosts defer a
3134 general message is written at the end. */
3136 if (rc == DEFER && first_addr->basic_errno != ERRNO_AUTHFAIL &&
3137 first_addr->basic_errno != ERRNO_TLSFAILURE)
3138 write_logs(first_addr, host);
3140 #ifdef EXPERIMENTAL_TPDA
3142 tpda_deferred(ob, first_addr, host);
3145 /* If STARTTLS was accepted, but there was a failure in setting up the
3146 TLS session (usually a certificate screwup), and the host is not in
3147 hosts_require_tls, and tls_tempfail_tryclear is true, try again, with
3148 TLS forcibly turned off. We have to start from scratch with a new SMTP
3149 connection. That's why the retry is done from here, not from within
3150 smtp_deliver(). [Rejections of STARTTLS itself don't screw up the
3151 session, so the in-clear transmission after those errors, if permitted,
3152 happens inside smtp_deliver().] */
3155 if (rc == DEFER && first_addr->basic_errno == ERRNO_TLSFAILURE &&
3156 ob->tls_tempfail_tryclear &&
3157 verify_check_this_host(&(ob->hosts_require_tls), NULL, host->name,
3158 host->address, NULL) != OK)
3160 log_write(0, LOG_MAIN, "TLS session failure: delivering unencrypted "
3161 "to %s [%s] (not in hosts_require_tls)", host->name, host->address);
3162 first_addr = prepare_addresses(addrlist, host);
3163 rc = smtp_deliver(addrlist, host, host_af, port, interface, tblock,
3164 expanded_hosts != NULL, &message_defer, TRUE);
3165 if (rc == DEFER && first_addr->basic_errno != ERRNO_AUTHFAIL)
3166 write_logs(first_addr, host);
3167 #ifdef EXPERIMENTAL_TPDA
3169 tpda_deferred(ob, first_addr, host);
3175 /* Delivery attempt finished */
3177 rs = (rc == OK)? US"OK" : (rc == DEFER)? US"DEFER" : (rc == ERROR)?
3180 set_process_info("delivering %s: just tried %s [%s] for %s%s: result %s",
3181 message_id, host->name, host->address, addrlist->address,
3182 (addrlist->next == NULL)? "" : " (& others)", rs);
3184 /* Release serialization if set up */
3186 if (serialized) enq_end(serialize_key);
3188 /* If the result is DEFER, or if a host retry record is known to exist, we
3189 need to add an item to the retry chain for updating the retry database
3190 at the end of delivery. We only need to add the item to the top address,
3191 of course. Also, if DEFER, we mark the IP address unusable so as to skip it
3192 for any other delivery attempts using the same address. (It is copied into
3193 the unusable tree at the outer level, so even if different address blocks
3194 contain the same address, it still won't get tried again.) */
3196 if (rc == DEFER || retry_host_key != NULL)
3198 int delete_flag = (rc != DEFER)? rf_delete : 0;
3199 if (retry_host_key == NULL)
3201 retry_host_key = ob->retry_include_ip_address?
3202 string_sprintf("T:%S:%s%s", host->name, host->address, pistring) :
3203 string_sprintf("T:%S%s", host->name, pistring);
3206 /* If a delivery of another message over an existing SMTP connection
3207 yields DEFER, we do NOT set up retry data for the host. This covers the
3208 case when there are delays in routing the addresses in the second message
3209 that are so long that the server times out. This is alleviated by not
3210 routing addresses that previously had routing defers when handling an
3211 existing connection, but even so, this case may occur (e.g. if a
3212 previously happily routed address starts giving routing defers). If the
3213 host is genuinely down, another non-continued message delivery will
3214 notice it soon enough. */
3216 if (delete_flag != 0 || !continuing)
3217 retry_add_item(first_addr, retry_host_key, rf_host | delete_flag);
3219 /* We may have tried an expired host, if its retry time has come; ensure
3220 the status reflects the expiry for the benefit of any other addresses. */
3224 host->status = (host_is_expired)?
3225 hstatus_unusable_expired : hstatus_unusable;
3226 host->why = hwhy_deferred;
3230 /* If message_defer is set (host was OK, but every recipient got deferred
3231 because of some message-specific problem), or if that had happened
3232 previously so that a message retry key exists, add an appropriate item
3233 to the retry chain. Note that if there was a message defer but now there is
3234 a host defer, the message defer record gets deleted. That seems perfectly
3235 reasonable. Also, stop the message from being remembered as waiting
3236 for specific hosts. */
3238 if (message_defer || retry_message_key != NULL)
3240 int delete_flag = message_defer? 0 : rf_delete;
3241 if (retry_message_key == NULL)
3243 retry_message_key = ob->retry_include_ip_address?
3244 string_sprintf("T:%S:%s%s:%s", host->name, host->address, pistring,
3246 string_sprintf("T:%S%s:%s", host->name, pistring, message_id);
3248 retry_add_item(addrlist, retry_message_key,
3249 rf_message | rf_host | delete_flag);
3250 update_waiting = FALSE;
3253 /* Any return other than DEFER (that is, OK or ERROR) means that the
3254 addresses have got their final statuses filled in for this host. In the OK
3255 case, see if any of them are deferred. */
3259 for (addr = addrlist; addr != NULL; addr = addr->next)
3261 if (addr->transport_return == DEFER)
3263 some_deferred = TRUE;
3269 /* If no addresses deferred or the result was ERROR, return. We do this for
3270 ERROR because a failing filter set-up or add_headers expansion is likely to
3271 fail for any host we try. */
3273 if (rc == ERROR || (rc == OK && !some_deferred))
3275 DEBUG(D_transport) debug_printf("Leaving %s transport\n", tblock->name);
3276 return TRUE; /* Each address has its status */
3279 /* If the result was DEFER or some individual addresses deferred, let
3280 the loop run to try other hosts with the deferred addresses, except for the
3281 case when we were trying to deliver down an existing channel and failed.
3282 Don't try any other hosts in this case. */
3284 if (continuing) break;
3286 /* If the whole delivery, or some individual addresses, were deferred and
3287 there are more hosts that could be tried, do not count this host towards
3288 the hosts_max_try limit if the age of the message is greater than the
3289 maximum retry time for this host. This means we may try try all hosts,
3290 ignoring the limit, when messages have been around for some time. This is
3291 important because if we don't try all hosts, the address will never time
3292 out. NOTE: this does not apply to hosts_max_try_hardlimit. */
3294 if ((rc == DEFER || some_deferred) && nexthost != NULL)
3297 retry_config *retry = retry_find_config(host->name, NULL, 0, 0);
3299 if (retry != NULL && retry->rules != NULL)
3301 retry_rule *last_rule;
3302 for (last_rule = retry->rules;
3303 last_rule->next != NULL;
3304 last_rule = last_rule->next);
3305 timedout = time(NULL) - received_time > last_rule->timeout;
3307 else timedout = TRUE; /* No rule => timed out */
3311 unexpired_hosts_tried--;
3312 DEBUG(D_transport) debug_printf("temporary delivery error(s) override "
3313 "hosts_max_try (message older than host's retry time)\n");
3316 } /* End of loop for trying multiple hosts. */
3318 /* This is the end of the loop that repeats iff expired is TRUE and
3319 ob->delay_after_cutoff is FALSE. The second time round we will
3320 try those hosts that haven't been tried since the message arrived. */
3324 debug_printf("all IP addresses skipped or deferred at least one address\n");
3325 if (expired && !ob->delay_after_cutoff && cutoff_retry == 0)
3326 debug_printf("retrying IP addresses not tried since message arrived\n");
3331 /* Get here if all IP addresses are skipped or defer at least one address. In
3332 MUA wrapper mode, this will happen only for connection or other non-message-
3333 specific failures. Force the delivery status for all addresses to FAIL. */
3337 for (addr = addrlist; addr != NULL; addr = addr->next)
3338 addr->transport_return = FAIL;
3342 /* In the normal, non-wrapper case, add a standard message to each deferred
3343 address if there hasn't been an error, that is, if it hasn't actually been
3344 tried this time. The variable "expired" will be FALSE if any deliveries were
3345 actually tried, or if there was at least one host that was not expired. That
3346 is, it is TRUE only if no deliveries were tried and all hosts were expired. If
3347 a delivery has been tried, an error code will be set, and the failing of the
3348 message is handled by the retry code later.
3350 If queue_smtp is set, or this transport was called to send a subsequent message
3351 down an existing TCP/IP connection, and something caused the host not to be
3352 found, we end up here, but can detect these cases and handle them specially. */
3354 for (addr = addrlist; addr != NULL; addr = addr->next)
3356 /* If host is not NULL, it means that we stopped processing the host list
3357 because of hosts_max_try or hosts_max_try_hardlimit. In the former case, this
3358 means we need to behave as if some hosts were skipped because their retry
3359 time had not come. Specifically, this prevents the address from timing out.
3360 However, if we have hit hosts_max_try_hardlimit, we want to behave as if all
3361 hosts were tried. */
3365 if (total_hosts_tried >= ob->hosts_max_try_hardlimit)
3368 debug_printf("hosts_max_try_hardlimit reached: behave as if all "
3369 "hosts were tried\n");
3374 debug_printf("hosts_max_try limit caused some hosts to be skipped\n");
3375 setflag(addr, af_retry_skipped);
3379 if (queue_smtp) /* no deliveries attempted */
3381 addr->transport_return = DEFER;
3382 addr->basic_errno = 0;
3383 addr->message = US"SMTP delivery explicitly queued";
3386 else if (addr->transport_return == DEFER &&
3387 (addr->basic_errno == ERRNO_UNKNOWNERROR || addr->basic_errno == 0) &&
3388 addr->message == NULL)
3390 addr->basic_errno = ERRNO_HRETRY;
3391 if (continue_hostname != NULL)
3393 addr->message = US"no host found for existing SMTP connection";
3397 setflag(addr, af_pass_message); /* This is not a security risk */
3398 addr->message = (ob->delay_after_cutoff)?
3399 US"retry time not reached for any host after a long failure period" :
3400 US"all hosts have been failing for a long time and were last tried "
3401 "after this message arrived";
3403 /* If we are already using fallback hosts, or there are no fallback hosts
3404 defined, convert the result to FAIL to cause a bounce. */
3406 if (addr->host_list == addr->fallback_hosts ||
3407 addr->fallback_hosts == NULL)
3408 addr->transport_return = FAIL;
3412 if (hosts_retry == hosts_total)
3413 addr->message = US"retry time not reached for any host";
3414 else if (hosts_fail == hosts_total)
3415 addr->message = US"all host address lookups failed permanently";
3416 else if (hosts_defer == hosts_total)
3417 addr->message = US"all host address lookups failed temporarily";
3418 else if (hosts_serial == hosts_total)
3419 addr->message = US"connection limit reached for all hosts";
3420 else if (hosts_fail+hosts_defer == hosts_total)
3421 addr->message = US"all host address lookups failed";
3422 else addr->message = US"some host address lookups failed and retry time "
3423 "not reached for other hosts or connection limit reached";
3428 /* Update the database which keeps information about which messages are waiting
3429 for which hosts to become available. For some message-specific errors, the
3430 update_waiting flag is turned off because we don't want follow-on deliveries in
3431 those cases. If this transport instance is explicitly limited to one message
3432 per connection then follow-on deliveries are not possible and there's no need
3433 to create/update the per-transport wait-<transport_name> database. */
3435 if (update_waiting && tblock->connection_max_messages != 1)
3436 transport_update_waiting(hostlist, tblock->name);
3440 DEBUG(D_transport) debug_printf("Leaving %s transport\n", tblock->name);
3442 return TRUE; /* Each address has its status */
3447 /* End of transport/smtp.c */
git://git.exim.org / exim.git / blob