1 /*************************************************
2 * Exim - an Internet mail transport agent *
3 *************************************************/
5 /* Copyright (c) University of Cambridge 1995 - 2012 */
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 { "dscp", opt_stringptr,
59 (void *)offsetof(smtp_transport_options_block, dscp) },
60 { "fallback_hosts", opt_stringptr,
61 (void *)offsetof(smtp_transport_options_block, fallback_hosts) },
62 { "final_timeout", opt_time,
63 (void *)offsetof(smtp_transport_options_block, final_timeout) },
64 { "gethostbyname", opt_bool,
65 (void *)offsetof(smtp_transport_options_block, gethostbyname) },
67 /* These are no longer honoured, as of Exim 4.80; for now, we silently
68 ignore; a later release will warn, and a later-still release will remove
69 these options, so that using them becomes an error. */
70 { "gnutls_require_kx", opt_stringptr,
71 (void *)offsetof(smtp_transport_options_block, gnutls_require_kx) },
72 { "gnutls_require_mac", opt_stringptr,
73 (void *)offsetof(smtp_transport_options_block, gnutls_require_mac) },
74 { "gnutls_require_protocols", opt_stringptr,
75 (void *)offsetof(smtp_transport_options_block, gnutls_require_proto) },
77 { "helo_data", opt_stringptr,
78 (void *)offsetof(smtp_transport_options_block, helo_data) },
79 { "hosts", opt_stringptr,
80 (void *)offsetof(smtp_transport_options_block, hosts) },
81 { "hosts_avoid_esmtp", opt_stringptr,
82 (void *)offsetof(smtp_transport_options_block, hosts_avoid_esmtp) },
83 { "hosts_avoid_pipelining", opt_stringptr,
84 (void *)offsetof(smtp_transport_options_block, hosts_avoid_pipelining) },
86 { "hosts_avoid_tls", opt_stringptr,
87 (void *)offsetof(smtp_transport_options_block, hosts_avoid_tls) },
89 { "hosts_max_try", opt_int,
90 (void *)offsetof(smtp_transport_options_block, hosts_max_try) },
91 { "hosts_max_try_hardlimit", opt_int,
92 (void *)offsetof(smtp_transport_options_block, hosts_max_try_hardlimit) },
94 { "hosts_nopass_tls", opt_stringptr,
95 (void *)offsetof(smtp_transport_options_block, hosts_nopass_tls) },
97 { "hosts_override", opt_bool,
98 (void *)offsetof(smtp_transport_options_block, hosts_override) },
99 { "hosts_randomize", opt_bool,
100 (void *)offsetof(smtp_transport_options_block, hosts_randomize) },
101 { "hosts_require_auth", opt_stringptr,
102 (void *)offsetof(smtp_transport_options_block, hosts_require_auth) },
104 # if defined EXPERIMENTAL_OCSP
105 { "hosts_require_ocsp", opt_stringptr,
106 (void *)offsetof(smtp_transport_options_block, hosts_require_ocsp) },
108 { "hosts_require_tls", opt_stringptr,
109 (void *)offsetof(smtp_transport_options_block, hosts_require_tls) },
111 { "hosts_try_auth", opt_stringptr,
112 (void *)offsetof(smtp_transport_options_block, hosts_try_auth) },
113 #ifdef EXPERIMENTAL_PRDR
114 { "hosts_try_prdr", opt_stringptr,
115 (void *)offsetof(smtp_transport_options_block, hosts_try_prdr) },
118 { "hosts_verify_avoid_tls", opt_stringptr,
119 (void *)offsetof(smtp_transport_options_block, hosts_verify_avoid_tls) },
121 { "interface", opt_stringptr,
122 (void *)offsetof(smtp_transport_options_block, interface) },
123 { "keepalive", opt_bool,
124 (void *)offsetof(smtp_transport_options_block, keepalive) },
125 { "lmtp_ignore_quota", opt_bool,
126 (void *)offsetof(smtp_transport_options_block, lmtp_ignore_quota) },
127 { "max_rcpt", opt_int | opt_public,
128 (void *)offsetof(transport_instance, max_addresses) },
129 { "multi_domain", opt_bool | opt_public,
130 (void *)offsetof(transport_instance, multi_domain) },
131 { "port", opt_stringptr,
132 (void *)offsetof(smtp_transport_options_block, port) },
133 { "protocol", opt_stringptr,
134 (void *)offsetof(smtp_transport_options_block, protocol) },
135 { "retry_include_ip_address", opt_bool,
136 (void *)offsetof(smtp_transport_options_block, retry_include_ip_address) },
137 { "serialize_hosts", opt_stringptr,
138 (void *)offsetof(smtp_transport_options_block, serialize_hosts) },
139 { "size_addition", opt_int,
140 (void *)offsetof(smtp_transport_options_block, size_addition) }
142 ,{ "tls_certificate", opt_stringptr,
143 (void *)offsetof(smtp_transport_options_block, tls_certificate) },
144 { "tls_crl", opt_stringptr,
145 (void *)offsetof(smtp_transport_options_block, tls_crl) },
146 { "tls_dh_min_bits", opt_int,
147 (void *)offsetof(smtp_transport_options_block, tls_dh_min_bits) },
148 { "tls_privatekey", opt_stringptr,
149 (void *)offsetof(smtp_transport_options_block, tls_privatekey) },
150 { "tls_require_ciphers", opt_stringptr,
151 (void *)offsetof(smtp_transport_options_block, tls_require_ciphers) },
152 { "tls_sni", opt_stringptr,
153 (void *)offsetof(smtp_transport_options_block, tls_sni) },
154 { "tls_tempfail_tryclear", opt_bool,
155 (void *)offsetof(smtp_transport_options_block, tls_tempfail_tryclear) },
156 { "tls_verify_certificates", opt_stringptr,
157 (void *)offsetof(smtp_transport_options_block, tls_verify_certificates) }
161 /* Size of the options list. An extern variable has to be used so that its
162 address can appear in the tables drtables.c. */
164 int smtp_transport_options_count =
165 sizeof(smtp_transport_options)/sizeof(optionlist);
167 /* Default private options block for the smtp transport. */
169 smtp_transport_options_block smtp_transport_option_defaults = {
171 NULL, /* fallback_hosts */
173 NULL, /* fallback_hostlist */
174 NULL, /* authenticated_sender */
175 US"$primary_hostname", /* helo_data */
176 NULL, /* interface */
178 US"smtp", /* protocol */
180 NULL, /* serialize_hosts */
181 NULL, /* hosts_try_auth */
182 NULL, /* hosts_require_auth */
183 #ifdef EXPERIMENTAL_PRDR
184 NULL, /* hosts_try_prdr */
186 #ifdef EXPERIMENTAL_OCSP
187 NULL, /* hosts_require_ocsp */
189 NULL, /* hosts_require_tls */
190 NULL, /* hosts_avoid_tls */
191 US"*", /* hosts_verify_avoid_tls */
192 NULL, /* hosts_avoid_pipelining */
193 NULL, /* hosts_avoid_esmtp */
194 NULL, /* hosts_nopass_tls */
195 5*60, /* command_timeout */
196 5*60, /* connect_timeout; shorter system default overrides */
197 5*60, /* data timeout */
198 10*60, /* final timeout */
199 1024, /* size_addition */
200 5, /* hosts_max_try */
201 50, /* hosts_max_try_hardlimit */
202 TRUE, /* address_retry_include_sender */
203 FALSE, /* allow_localhost */
204 FALSE, /* authenticated_sender_force */
205 FALSE, /* gethostbyname */
206 TRUE, /* dns_qualify_single */
207 FALSE, /* dns_search_parents */
208 TRUE, /* delay_after_cutoff */
209 FALSE, /* hosts_override */
210 FALSE, /* hosts_randomize */
211 TRUE, /* keepalive */
212 FALSE, /* lmtp_ignore_quota */
213 TRUE /* retry_include_ip_address */
215 ,NULL, /* tls_certificate */
217 NULL, /* tls_privatekey */
218 NULL, /* tls_require_ciphers */
219 NULL, /* gnutls_require_kx */
220 NULL, /* gnutls_require_mac */
221 NULL, /* gnutls_require_proto */
223 NULL, /* tls_verify_certificates */
224 EXIM_CLIENT_DH_DEFAULT_MIN_BITS,
225 /* tls_dh_min_bits */
226 TRUE /* tls_tempfail_tryclear */
229 ,NULL, /* dkim_canon */
230 NULL, /* dkim_domain */
231 NULL, /* dkim_private_key */
232 NULL, /* dkim_selector */
233 NULL, /* dkim_sign_headers */
234 NULL /* dkim_strict */
241 static uschar *smtp_command; /* Points to last cmd for error messages */
242 static uschar *mail_command; /* Points to MAIL cmd for error messages */
243 static BOOL update_waiting; /* TRUE to update the "wait" database */
246 /*************************************************
247 * Setup entry point *
248 *************************************************/
250 /* This function is called when the transport is about to be used,
251 but before running it in a sub-process. It is used for two things:
253 (1) To set the fallback host list in addresses, when delivering.
254 (2) To pass back the interface, port, protocol, and other options, for use
255 during callout verification.
258 tblock pointer to the transport instance block
259 addrlist list of addresses about to be transported
260 tf if not NULL, pointer to block in which to return options
261 uid the uid that will be set (not used)
262 gid the gid that will be set (not used)
263 errmsg place for error message (not used)
265 Returns: OK always (FAIL, DEFER not used)
269 smtp_transport_setup(transport_instance *tblock, address_item *addrlist,
270 transport_feedback *tf, uid_t uid, gid_t gid, uschar **errmsg)
272 smtp_transport_options_block *ob =
273 (smtp_transport_options_block *)(tblock->options_block);
275 errmsg = errmsg; /* Keep picky compilers happy */
279 /* Pass back options if required. This interface is getting very messy. */
283 tf->interface = ob->interface;
285 tf->protocol = ob->protocol;
286 tf->hosts = ob->hosts;
287 tf->hosts_override = ob->hosts_override;
288 tf->hosts_randomize = ob->hosts_randomize;
289 tf->gethostbyname = ob->gethostbyname;
290 tf->qualify_single = ob->dns_qualify_single;
291 tf->search_parents = ob->dns_search_parents;
292 tf->helo_data = ob->helo_data;
295 /* Set the fallback host list for all the addresses that don't have fallback
296 host lists, provided that the local host wasn't present in the original host
299 if (!testflag(addrlist, af_local_host_removed))
301 for (; addrlist != NULL; addrlist = addrlist->next)
302 if (addrlist->fallback_hosts == NULL)
303 addrlist->fallback_hosts = ob->fallback_hostlist;
311 /*************************************************
312 * Initialization entry point *
313 *************************************************/
315 /* Called for each instance, after its options have been read, to
316 enable consistency checks to be done, or anything else that needs
319 Argument: pointer to the transport instance block
324 smtp_transport_init(transport_instance *tblock)
326 smtp_transport_options_block *ob =
327 (smtp_transport_options_block *)(tblock->options_block);
329 /* Retry_use_local_part defaults FALSE if unset */
331 if (tblock->retry_use_local_part == TRUE_UNSET)
332 tblock->retry_use_local_part = FALSE;
334 /* Set the default port according to the protocol */
336 if (ob->port == NULL)
337 ob->port = (strcmpic(ob->protocol, US"lmtp") == 0)? US"lmtp" :
338 (strcmpic(ob->protocol, US"smtps") == 0)? US"smtps" : US"smtp";
340 /* Set up the setup entry point, to be called before subprocesses for this
343 tblock->setup = smtp_transport_setup;
345 /* Complain if any of the timeouts are zero. */
347 if (ob->command_timeout <= 0 || ob->data_timeout <= 0 ||
348 ob->final_timeout <= 0)
349 log_write(0, LOG_PANIC_DIE|LOG_CONFIG,
350 "command, data, or final timeout value is zero for %s transport",
353 /* If hosts_override is set and there are local hosts, set the global
354 flag that stops verify from showing router hosts. */
356 if (ob->hosts_override && ob->hosts != NULL) tblock->overrides_hosts = TRUE;
358 /* If there are any fallback hosts listed, build a chain of host items
359 for them, but do not do any lookups at this time. */
361 host_build_hostlist(&(ob->fallback_hostlist), ob->fallback_hosts, FALSE);
368 /*************************************************
369 * Set delivery info into all active addresses *
370 *************************************************/
372 /* Only addresses whose status is >= PENDING are relevant. A lesser
373 status means that an address is not currently being processed.
376 addrlist points to a chain of addresses
377 errno_value to put in each address's errno field
378 msg to put in each address's message field
379 rc to put in each address's transport_return field
380 pass_message if TRUE, set the "pass message" flag in the address
382 If errno_value has the special value ERRNO_CONNECTTIMEOUT, ETIMEDOUT is put in
383 the errno field, and RTEF_CTOUT is ORed into the more_errno field, to indicate
384 this particular type of timeout.
390 set_errno(address_item *addrlist, int errno_value, uschar *msg, int rc,
395 if (errno_value == ERRNO_CONNECTTIMEOUT)
397 errno_value = ETIMEDOUT;
398 orvalue = RTEF_CTOUT;
400 for (addr = addrlist; addr != NULL; addr = addr->next)
402 if (addr->transport_return < PENDING) continue;
403 addr->basic_errno = errno_value;
404 addr->more_errno |= orvalue;
408 if (pass_message) setflag(addr, af_pass_message);
410 addr->transport_return = rc;
416 /*************************************************
417 * Check an SMTP response *
418 *************************************************/
420 /* This function is given an errno code and the SMTP response buffer
421 to analyse, together with the host identification for generating messages. It
422 sets an appropriate message and puts the first digit of the response code into
423 the yield variable. If no response was actually read, a suitable digit is
427 host the current host, to get its name for messages
428 errno_value pointer to the errno value
429 more_errno from the top address for use with ERRNO_FILTER_FAIL
430 buffer the SMTP response buffer
431 yield where to put a one-digit SMTP response code
432 message where to put an errror message
433 pass_message set TRUE if message is an SMTP response
435 Returns: TRUE if an SMTP "QUIT" command should be sent, else FALSE
438 static BOOL check_response(host_item *host, int *errno_value, int more_errno,
439 uschar *buffer, int *yield, uschar **message, BOOL *pass_message)
443 if (smtp_use_pipelining &&
444 (Ustrcmp(smtp_command, "MAIL") == 0 ||
445 Ustrcmp(smtp_command, "RCPT") == 0 ||
446 Ustrcmp(smtp_command, "DATA") == 0))
449 *yield = '4'; /* Default setting is to give a temporary error */
451 /* Handle response timeout */
453 if (*errno_value == ETIMEDOUT)
455 *message = US string_sprintf("SMTP timeout while connected to %s [%s] "
456 "after %s%s", host->name, host->address, pl, smtp_command);
457 if (transport_count > 0)
458 *message = US string_sprintf("%s (%d bytes written)", *message,
463 /* Handle malformed SMTP response */
465 if (*errno_value == ERRNO_SMTPFORMAT)
467 uschar *malfresp = string_printing(buffer);
468 while (isspace(*malfresp)) malfresp++;
470 *message = string_sprintf("Malformed SMTP reply (an empty line) from "
471 "%s [%s] in response to %s%s", host->name, host->address, pl,
474 *message = string_sprintf("Malformed SMTP reply from %s [%s] in response "
475 "to %s%s: %s", host->name, host->address, pl, smtp_command, malfresp);
479 /* Handle a failed filter process error; can't send QUIT as we mustn't
482 if (*errno_value == ERRNO_FILTER_FAIL)
484 *message = US string_sprintf("transport filter process failed (%d)%s",
486 (more_errno == EX_EXECFAILED)? ": unable to execute command" : "");
490 /* Handle a failed add_headers expansion; can't send QUIT as we mustn't
493 if (*errno_value == ERRNO_CHHEADER_FAIL)
496 US string_sprintf("failed to expand headers_add or headers_remove: %s",
497 expand_string_message);
501 /* Handle failure to write a complete data block */
503 if (*errno_value == ERRNO_WRITEINCOMPLETE)
505 *message = US string_sprintf("failed to write a data block");
509 /* Handle error responses from the remote mailer. */
513 uschar *s = string_printing(buffer);
514 *message = US string_sprintf("SMTP error from remote mail server after %s%s: "
515 "host %s [%s]: %s", pl, smtp_command, host->name, host->address, s);
516 *pass_message = TRUE;
521 /* No data was read. If there is no errno, this must be the EOF (i.e.
522 connection closed) case, which causes deferral. An explicit connection reset
523 error has the same effect. Otherwise, put the host's identity in the message,
524 leaving the errno value to be interpreted as well. In all cases, we have to
525 assume the connection is now dead. */
527 if (*errno_value == 0 || *errno_value == ECONNRESET)
529 *errno_value = ERRNO_SMTPCLOSED;
530 *message = US string_sprintf("Remote host %s [%s] closed connection "
531 "in response to %s%s", host->name, host->address, pl, smtp_command);
533 else *message = US string_sprintf("%s [%s]", host->name, host->address);
540 /*************************************************
541 * Write error message to logs *
542 *************************************************/
544 /* This writes to the main log and to the message log.
547 addr the address item containing error information
548 host the current host
554 write_logs(address_item *addr, host_item *host)
556 if (addr->message != NULL)
558 uschar *message = addr->message;
559 if (addr->basic_errno > 0)
560 message = string_sprintf("%s: %s", message, strerror(addr->basic_errno));
561 log_write(0, LOG_MAIN, "%s", message);
562 deliver_msglog("%s %s\n", tod_stamp(tod_log), message);
567 ((log_extra_selector & LX_outgoing_port) != 0)?
568 string_sprintf("%s [%s]:%d", host->name, host->address,
569 (host->port == PORT_NONE)? 25 : host->port)
571 string_sprintf("%s [%s]", host->name, host->address);
572 log_write(0, LOG_MAIN, "%s %s", msg, strerror(addr->basic_errno));
573 deliver_msglog("%s %s %s\n", tod_stamp(tod_log), msg,
574 strerror(addr->basic_errno));
580 /*************************************************
581 * Synchronize SMTP responses *
582 *************************************************/
584 /* This function is called from smtp_deliver() to receive SMTP responses from
585 the server, and match them up with the commands to which they relate. When
586 PIPELINING is not in use, this function is called after every command, and is
587 therefore somewhat over-engineered, but it is simpler to use a single scheme
588 that works both with and without PIPELINING instead of having two separate sets
591 The set of commands that are buffered up with pipelining may start with MAIL
592 and may end with DATA; in between are RCPT commands that correspond to the
593 addresses whose status is PENDING_DEFER. All other commands (STARTTLS, AUTH,
594 etc.) are never buffered.
596 Errors after MAIL or DATA abort the whole process leaving the response in the
597 buffer. After MAIL, pending responses are flushed, and the original command is
598 re-instated in big_buffer for error messages. For RCPT commands, the remote is
599 permitted to reject some recipient addresses while accepting others. However
600 certain errors clearly abort the whole process. Set the value in
601 transport_return to PENDING_OK if the address is accepted. If there is a
602 subsequent general error, it will get reset accordingly. If not, it will get
603 converted to OK at the end.
606 addrlist the complete address list
607 include_affixes TRUE if affixes include in RCPT
608 sync_addr ptr to the ptr of the one to start scanning at (updated)
609 host the host we are connected to
610 count the number of responses to read
612 include_sender true if 4xx retry is to include the sender it its key
613 pending_MAIL true if the first response is for MAIL
614 pending_DATA 0 if last command sent was not DATA
615 +1 if previously had a good recipient
616 -1 if not previously had a good recipient
617 inblock incoming SMTP block
618 timeout timeout value
619 buffer buffer for reading response
620 buffsize size of buffer
622 Returns: 3 if at least one address had 2xx and one had 5xx
623 2 if at least one address had 5xx but none had 2xx
624 1 if at least one host had a 2xx response, but none had 5xx
625 0 no address had 2xx or 5xx but no errors (all 4xx, or just DATA)
626 -1 timeout while reading RCPT response
627 -2 I/O or other non-response error for RCPT
628 -3 DATA or MAIL failed - errno and buffer set
632 sync_responses(address_item *addrlist, BOOL include_affixes,
633 address_item **sync_addr, host_item *host, int count,
634 BOOL address_retry_include_sender, BOOL pending_MAIL,
635 int pending_DATA, smtp_inblock *inblock, int timeout, uschar *buffer,
638 address_item *addr = *sync_addr;
641 /* Handle the response for a MAIL command. On error, reinstate the original
642 command in big_buffer for error message use, and flush any further pending
643 responses before returning, except after I/O errors and timeouts. */
648 if (!smtp_read_response(inblock, buffer, buffsize, '2', timeout))
650 Ustrcpy(big_buffer, mail_command); /* Fits, because it came from there! */
651 if (errno == 0 && buffer[0] != 0)
653 uschar flushbuffer[4096];
655 if (buffer[0] == '4')
657 save_errno = ERRNO_MAIL4XX;
658 addr->more_errno |= ((buffer[1] - '0')*10 + buffer[2] - '0') << 8;
662 if (!smtp_read_response(inblock, flushbuffer, sizeof(flushbuffer),
664 && (errno != 0 || flushbuffer[0] == 0))
673 if (pending_DATA) count--; /* Number of RCPT responses to come */
675 /* Read and handle the required number of RCPT responses, matching each one up
676 with an address by scanning for the next address whose status is PENDING_DEFER.
681 while (addr->transport_return != PENDING_DEFER) addr = addr->next;
683 /* The address was accepted */
685 if (smtp_read_response(inblock, buffer, buffsize, '2', timeout))
688 addr->transport_return = PENDING_OK;
690 /* If af_dr_retry_exists is set, there was a routing delay on this address;
691 ensure that any address-specific retry record is expunged. We do this both
692 for the basic key and for the version that also includes the sender. */
694 if (testflag(addr, af_dr_retry_exists))
696 uschar *altkey = string_sprintf("%s:<%s>", addr->address_retry_key,
698 retry_add_item(addr, altkey, rf_delete);
699 retry_add_item(addr, addr->address_retry_key, rf_delete);
703 /* Timeout while reading the response */
705 else if (errno == ETIMEDOUT)
707 int save_errno = errno;
708 uschar *message = string_sprintf("SMTP timeout while connected to %s [%s] "
709 "after RCPT TO:<%s>", host->name, host->address,
710 transport_rcpt_address(addr, include_affixes));
711 set_errno(addrlist, save_errno, message, DEFER, FALSE);
712 retry_add_item(addr, addr->address_retry_key, 0);
713 update_waiting = FALSE;
717 /* Handle other errors in obtaining an SMTP response by returning -1. This
718 will cause all the addresses to be deferred. Restore the SMTP command in
719 big_buffer for which we are checking the response, so the error message
722 else if (errno != 0 || buffer[0] == 0)
724 string_format(big_buffer, big_buffer_size, "RCPT TO:<%s>",
725 transport_rcpt_address(addr, include_affixes));
729 /* Handle SMTP permanent and temporary response codes. */
734 string_sprintf("SMTP error from remote mail server after RCPT TO:<%s>: "
735 "host %s [%s]: %s", transport_rcpt_address(addr, include_affixes),
736 host->name, host->address, string_printing(buffer));
737 setflag(addr, af_pass_message);
738 deliver_msglog("%s %s\n", tod_stamp(tod_log), addr->message);
740 /* The response was 5xx */
742 if (buffer[0] == '5')
744 addr->transport_return = FAIL;
748 /* The response was 4xx */
752 addr->transport_return = DEFER;
753 addr->basic_errno = ERRNO_RCPT4XX;
754 addr->more_errno |= ((buffer[1] - '0')*10 + buffer[2] - '0') << 8;
756 /* Log temporary errors if there are more hosts to be tried. */
758 if (host->next != NULL) log_write(0, LOG_MAIN, "%s", addr->message);
760 /* Do not put this message on the list of those waiting for specific
761 hosts, as otherwise it is likely to be tried too often. */
763 update_waiting = FALSE;
765 /* Add a retry item for the address so that it doesn't get tried again
766 too soon. If address_retry_include_sender is true, add the sender address
769 if (address_retry_include_sender)
771 uschar *altkey = string_sprintf("%s:<%s>", addr->address_retry_key,
773 retry_add_item(addr, altkey, 0);
775 else retry_add_item(addr, addr->address_retry_key, 0);
778 } /* Loop for next RCPT response */
780 /* Update where to start at for the next block of responses, unless we
781 have already handled all the addresses. */
783 if (addr != NULL) *sync_addr = addr->next;
785 /* Handle a response to DATA. If we have not had any good recipients, either
786 previously or in this block, the response is ignored. */
788 if (pending_DATA != 0 &&
789 !smtp_read_response(inblock, buffer, buffsize, '3', timeout))
794 if (pending_DATA > 0 || (yield & 1) != 0)
796 if (errno == 0 && buffer[0] == '4')
798 errno = ERRNO_DATA4XX;
799 addrlist->more_errno |= ((buffer[1] - '0')*10 + buffer[2] - '0') << 8;
803 (void)check_response(host, &errno, 0, buffer, &code, &msg, &pass_message);
804 DEBUG(D_transport) debug_printf("%s\nerror for DATA ignored: pipelining "
805 "is in use and there were no good recipients\n", msg);
808 /* All responses read and handled; MAIL (if present) received 2xx and DATA (if
809 present) received 3xx. If any RCPTs were handled and yielded anything other
810 than 4xx, yield will be set non-zero. */
817 /* Do the client side of smtp-level authentication */
820 buffer EHLO response from server (gets overwritten)
821 addrlist chain of potential addresses to deliver
822 host host to deliver to
824 ibp, obp comms channel control blocks
827 OK Success, or failed (but not required): global "smtp_authenticated" set
828 DEFER Failed authentication (and was required)
829 ERROR Internal problem
831 FAIL_SEND Failed communications - transmit
836 smtp_auth(uschar *buffer, unsigned bufsize, address_item *addrlist, host_item *host,
837 smtp_transport_options_block *ob, BOOL is_esmtp,
838 smtp_inblock *ibp, smtp_outblock *obp)
841 uschar *fail_reason = US"server did not advertise AUTH support";
843 smtp_authenticated = FALSE;
844 client_authenticator = client_authenticated_id = client_authenticated_sender = NULL;
845 require_auth = verify_check_this_host(&(ob->hosts_require_auth), NULL,
846 host->name, host->address, NULL);
848 if (is_esmtp && !regex_AUTH) regex_AUTH =
849 regex_must_compile(US"\\n250[\\s\\-]AUTH\\s+([\\-\\w\\s]+)(?:\\n|$)",
852 if (is_esmtp && regex_match_and_setup(regex_AUTH, buffer, 0, -1))
854 uschar *names = string_copyn(expand_nstring[1], expand_nlength[1]);
855 expand_nmax = -1; /* reset */
857 /* Must not do this check until after we have saved the result of the
858 regex match above. */
860 if (require_auth == OK ||
861 verify_check_this_host(&(ob->hosts_try_auth), NULL, host->name,
862 host->address, NULL) == OK)
865 fail_reason = US"no common mechanisms were found";
867 DEBUG(D_transport) debug_printf("scanning authentication mechanisms\n");
869 /* Scan the configured authenticators looking for one which is configured
870 for use as a client, which is not suppressed by client_condition, and
871 whose name matches an authentication mechanism supported by the server.
872 If one is found, attempt to authenticate by calling its client function.
875 for (au = auths; !smtp_authenticated && au != NULL; au = au->next)
879 (au->client_condition != NULL &&
880 !expand_check_condition(au->client_condition, au->name,
881 US"client authenticator")))
883 DEBUG(D_transport) debug_printf("skipping %s authenticator: %s\n",
885 (au->client)? "client_condition is false" :
886 "not configured as a client");
890 /* Loop to scan supported server mechanisms */
895 int len = Ustrlen(au->public_name);
896 while (isspace(*p)) p++;
898 if (strncmpic(au->public_name, p, len) != 0 ||
899 (p[len] != 0 && !isspace(p[len])))
901 while (*p != 0 && !isspace(*p)) p++;
905 /* Found data for a listed mechanism. Call its client entry. Set
906 a flag in the outblock so that data is overwritten after sending so
907 that reflections don't show it. */
909 fail_reason = US"authentication attempt(s) failed";
910 obp->authenticating = TRUE;
911 rc = (au->info->clientcode)(au, ibp, obp,
912 ob->command_timeout, buffer, bufsize);
913 obp->authenticating = FALSE;
914 DEBUG(D_transport) debug_printf("%s authenticator yielded %d\n",
917 /* A temporary authentication failure must hold up delivery to
918 this host. After a permanent authentication failure, we carry on
919 to try other authentication methods. If all fail hard, try to
920 deliver the message unauthenticated unless require_auth was set. */
925 smtp_authenticated = TRUE; /* stops the outer loop */
926 client_authenticator = au->name;
927 if (au->set_client_id != NULL)
928 client_authenticated_id = expand_string(au->set_client_id);
931 /* Failure after writing a command */
936 /* Failure after reading a response */
939 if (errno != 0 || buffer[0] != '5') return FAIL;
940 log_write(0, LOG_MAIN, "%s authenticator failed H=%s [%s] %s",
941 au->name, host->name, host->address, buffer);
944 /* Failure by some other means. In effect, the authenticator
945 decided it wasn't prepared to handle this case. Typically this
946 is the result of "fail" in an expansion string. Do we need to
947 log anything here? Feb 2006: a message is now put in the buffer
948 if logging is required. */
952 log_write(0, LOG_MAIN, "%s authenticator cancelled "
953 "authentication H=%s [%s] %s", au->name, host->name,
954 host->address, buffer);
957 /* Internal problem, message in buffer. */
960 set_errno(addrlist, 0, string_copy(buffer), DEFER, FALSE);
964 break; /* If not authenticated, try next authenticator */
965 } /* Loop for scanning supported server mechanisms */
966 } /* Loop for further authenticators */
970 /* If we haven't authenticated, but are required to, give up. */
972 if (require_auth == OK && !smtp_authenticated)
974 set_errno(addrlist, ERRNO_AUTHFAIL,
975 string_sprintf("authentication required but %s", fail_reason), DEFER,
984 /* Construct AUTH appendix string for MAIL TO */
987 buffer to build string
988 addrlist chain of potential addresses to deliver
991 Globals smtp_authenticated
992 client_authenticated_sender
993 Return True on error, otherwise buffer has (possibly empty) terminated string
997 smtp_mail_auth_str(uschar *buffer, unsigned bufsize, address_item *addrlist,
998 smtp_transport_options_block *ob)
1000 uschar *local_authenticated_sender = authenticated_sender;
1003 debug_printf("smtp_mail_auth_str: as<%s> os<%s> SA<%s>\n", authenticated_sender, ob->authenticated_sender, smtp_authenticated?"Y":"N");
1006 if (ob->authenticated_sender != NULL)
1008 uschar *new = expand_string(ob->authenticated_sender);
1011 if (!expand_string_forcedfail)
1013 uschar *message = string_sprintf("failed to expand "
1014 "authenticated_sender: %s", expand_string_message);
1015 set_errno(addrlist, 0, message, DEFER, FALSE);
1019 else if (new[0] != 0) local_authenticated_sender = new;
1022 /* Add the authenticated sender address if present */
1024 if ((smtp_authenticated || ob->authenticated_sender_force) &&
1025 local_authenticated_sender != NULL)
1027 string_format(buffer, bufsize, " AUTH=%s",
1028 auth_xtextencode(local_authenticated_sender,
1029 Ustrlen(local_authenticated_sender)));
1030 client_authenticated_sender = string_copy(local_authenticated_sender);
1040 /*************************************************
1041 * Deliver address list to given host *
1042 *************************************************/
1044 /* If continue_hostname is not null, we get here only when continuing to
1045 deliver down an existing channel. The channel was passed as the standard
1046 input. TLS is never active on a passed channel; the previous process always
1047 closes it down before passing the connection on.
1049 Otherwise, we have to make a connection to the remote host, and do the
1050 initial protocol exchange.
1052 When running as an MUA wrapper, if the sender or any recipient is rejected,
1053 temporarily or permanently, we force failure for all recipients.
1056 addrlist chain of potential addresses to deliver; only those whose
1057 transport_return field is set to PENDING_DEFER are currently
1058 being processed; others should be skipped - they have either
1059 been delivered to an earlier host or IP address, or been
1060 failed by one of them.
1061 host host to deliver to
1062 host_af AF_INET or AF_INET6
1063 port default TCP/IP port to use, in host byte order
1064 interface interface to bind to, or NULL
1065 tblock transport instance block
1066 copy_host TRUE if host set in addr->host_used must be copied, because
1067 it is specific to this call of the transport
1068 message_defer set TRUE if yield is OK, but all addresses were deferred
1069 because of a non-recipient, non-host failure, that is, a
1070 4xx response to MAIL FROM, DATA, or ".". This is a defer
1071 that is specific to the message.
1072 suppress_tls if TRUE, don't attempt a TLS connection - this is set for
1073 a second attempt after TLS initialization fails
1075 Returns: OK - the connection was made and the delivery attempted;
1076 the result for each address is in its data block.
1077 DEFER - the connection could not be made, or something failed
1078 while setting up the SMTP session, or there was a
1079 non-message-specific error, such as a timeout.
1080 ERROR - a filter command is specified for this transport,
1081 and there was a problem setting it up; OR helo_data
1082 or add_headers or authenticated_sender is specified
1083 for this transport, and the string failed to expand
1087 smtp_deliver(address_item *addrlist, host_item *host, int host_af, int port,
1088 uschar *interface, transport_instance *tblock, BOOL copy_host,
1089 BOOL *message_defer, BOOL suppress_tls)
1092 address_item *sync_addr;
1093 address_item *first_addr = addrlist;
1098 time_t start_delivery_time = time(NULL);
1099 smtp_transport_options_block *ob =
1100 (smtp_transport_options_block *)(tblock->options_block);
1101 BOOL lmtp = strcmpic(ob->protocol, US"lmtp") == 0;
1102 BOOL smtps = strcmpic(ob->protocol, US"smtps") == 0;
1104 BOOL send_rset = TRUE;
1105 BOOL send_quit = TRUE;
1106 BOOL setting_up = TRUE;
1107 BOOL completed_address = FALSE;
1110 BOOL pass_message = FALSE;
1111 #ifdef EXPERIMENTAL_PRDR
1112 BOOL prdr_offered = FALSE;
1115 smtp_inblock inblock;
1116 smtp_outblock outblock;
1117 int max_rcpt = tblock->max_addresses;
1118 uschar *igquotstr = US"";
1119 uschar *helo_data = NULL;
1120 uschar *message = NULL;
1121 uschar new_message_id[MESSAGE_ID_LENGTH + 1];
1123 uschar buffer[4096];
1124 uschar inbuffer[4096];
1125 uschar outbuffer[1024];
1127 suppress_tls = suppress_tls; /* stop compiler warning when no TLS support */
1129 *message_defer = FALSE;
1130 smtp_command = US"initial connection";
1131 if (max_rcpt == 0) max_rcpt = 999999;
1133 /* Set up the buffer for reading SMTP response packets. */
1135 inblock.buffer = inbuffer;
1136 inblock.buffersize = sizeof(inbuffer);
1137 inblock.ptr = inbuffer;
1138 inblock.ptrend = inbuffer;
1140 /* Set up the buffer for holding SMTP commands while pipelining */
1142 outblock.buffer = outbuffer;
1143 outblock.buffersize = sizeof(outbuffer);
1144 outblock.ptr = outbuffer;
1145 outblock.cmd_count = 0;
1146 outblock.authenticating = FALSE;
1148 /* Reset the parameters of a TLS session. */
1151 tls_in.cipher = NULL; /* for back-compatible behaviour */
1152 tls_in.peerdn = NULL;
1153 #if defined(SUPPORT_TLS) && !defined(USE_GNUTLS)
1158 tls_out.cipher = NULL; /* the one we may use for this transport */
1159 tls_out.peerdn = NULL;
1160 #if defined(SUPPORT_TLS) && !defined(USE_GNUTLS)
1167 set_errno(addrlist, 0, US"TLS support not available", DEFER, FALSE);
1172 /* Make a connection to the host if this isn't a continued delivery, and handle
1173 the initial interaction and HELO/EHLO/LHLO. Connect timeout errors are handled
1174 specially so they can be identified for retries. */
1176 if (continue_hostname == NULL)
1178 inblock.sock = outblock.sock =
1179 smtp_connect(host, host_af, port, interface, ob->connect_timeout,
1180 ob->keepalive, ob->dscp); /* This puts port into host->port */
1182 if (inblock.sock < 0)
1184 set_errno(addrlist, (errno == ETIMEDOUT)? ERRNO_CONNECTTIMEOUT : errno,
1185 NULL, DEFER, FALSE);
1189 /* Expand the greeting message while waiting for the initial response. (Makes
1190 sense if helo_data contains ${lookup dnsdb ...} stuff). The expansion is
1191 delayed till here so that $sending_interface and $sending_port are set. */
1193 helo_data = expand_string(ob->helo_data);
1195 /* The first thing is to wait for an initial OK response. The dreaded "goto"
1196 is nevertheless a reasonably clean way of programming this kind of logic,
1197 where you want to escape on any error. */
1201 if (!smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
1202 ob->command_timeout)) goto RESPONSE_FAILED;
1204 /* Now check if the helo_data expansion went well, and sign off cleanly if
1207 if (helo_data == NULL)
1209 uschar *message = string_sprintf("failed to expand helo_data: %s",
1210 expand_string_message);
1211 set_errno(addrlist, 0, message, DEFER, FALSE);
1217 /** Debugging without sending a message
1218 addrlist->transport_return = DEFER;
1222 /* Errors that occur after this point follow an SMTP command, which is
1223 left in big_buffer by smtp_write_command() for use in error messages. */
1225 smtp_command = big_buffer;
1227 /* Tell the remote who we are...
1229 February 1998: A convention has evolved that ESMTP-speaking MTAs include the
1230 string "ESMTP" in their greeting lines, so make Exim send EHLO if the
1231 greeting is of this form. The assumption was that the far end supports it
1232 properly... but experience shows that there are some that give 5xx responses,
1233 even though the banner includes "ESMTP" (there's a bloody-minded one that
1234 says "ESMTP not spoken here"). Cope with that case.
1236 September 2000: Time has passed, and it seems reasonable now to always send
1237 EHLO at the start. It is also convenient to make the change while installing
1240 July 2003: Joachim Wieland met a broken server that advertises "PIPELINING"
1241 but times out after sending MAIL FROM, RCPT TO and DATA all together. There
1242 would be no way to send out the mails, so there is now a host list
1243 "hosts_avoid_esmtp" that disables ESMTP for special hosts and solves the
1244 PIPELINING problem as well. Maybe it can also be useful to cure other
1245 problems with broken servers.
1247 Exim originally sent "Helo" at this point and ran for nearly a year that way.
1248 Then somebody tried it with a Microsoft mailer... It seems that all other
1249 mailers use upper case for some reason (the RFC is quite clear about case
1250 independence) so, for peace of mind, I gave in. */
1252 esmtp = verify_check_this_host(&(ob->hosts_avoid_esmtp), NULL,
1253 host->name, host->address, NULL) != OK;
1255 /* Alas; be careful, since this goto is not an error-out, so conceivably
1256 we might set data between here and the target which we assume to exist
1257 and be usable. I can see this coming back to bite us. */
1262 suppress_tls = FALSE;
1263 ob->tls_tempfail_tryclear = FALSE;
1264 smtp_command = US"SSL-on-connect";
1271 if (smtp_write_command(&outblock, FALSE, "%s %s\r\n",
1272 lmtp? "LHLO" : "EHLO", helo_data) < 0)
1274 if (!smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
1275 ob->command_timeout))
1277 if (errno != 0 || buffer[0] == 0 || lmtp) goto RESPONSE_FAILED;
1284 debug_printf("not sending EHLO (host matches hosts_avoid_esmtp)\n");
1289 if (smtp_write_command(&outblock, FALSE, "HELO %s\r\n", helo_data) < 0)
1291 if (!smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
1292 ob->command_timeout)) goto RESPONSE_FAILED;
1295 /* Set IGNOREQUOTA if the response to LHLO specifies support and the
1296 lmtp_ignore_quota option was set. */
1298 igquotstr = (lmtp && ob->lmtp_ignore_quota &&
1299 pcre_exec(regex_IGNOREQUOTA, NULL, CS buffer, Ustrlen(CS buffer), 0,
1300 PCRE_EOPT, NULL, 0) >= 0)? US" IGNOREQUOTA" : US"";
1302 /* Set tls_offered if the response to EHLO specifies support for STARTTLS. */
1305 tls_offered = esmtp &&
1306 pcre_exec(regex_STARTTLS, NULL, CS buffer, Ustrlen(buffer), 0,
1307 PCRE_EOPT, NULL, 0) >= 0;
1310 #ifdef EXPERIMENTAL_PRDR
1311 prdr_offered = esmtp &&
1312 (pcre_exec(regex_PRDR, NULL, CS buffer, Ustrlen(buffer), 0,
1313 PCRE_EOPT, NULL, 0) >= 0) &&
1314 (verify_check_this_host(&(ob->hosts_try_prdr), NULL, host->name,
1315 host->address, NULL) == OK);
1318 {DEBUG(D_transport) debug_printf("PRDR usable\n");}
1322 /* For continuing deliveries down the same channel, the socket is the standard
1323 input, and we don't need to redo EHLO here (but may need to do so for TLS - see
1324 below). Set up the pointer to where subsequent commands will be left, for
1325 error messages. Note that smtp_use_size and smtp_use_pipelining will have been
1326 set from the command line if they were set in the process that passed the
1331 inblock.sock = outblock.sock = fileno(stdin);
1332 smtp_command = big_buffer;
1333 host->port = port; /* Record the port that was used */
1336 /* If TLS is available on this connection, whether continued or not, attempt to
1337 start up a TLS session, unless the host is in hosts_avoid_tls. If successful,
1338 send another EHLO - the server may give a different answer in secure mode. We
1339 use a separate buffer for reading the response to STARTTLS so that if it is
1340 negative, the original EHLO data is available for subsequent analysis, should
1341 the client not be required to use TLS. If the response is bad, copy the buffer
1342 for error analysis. */
1345 if (tls_offered && !suppress_tls &&
1346 verify_check_this_host(&(ob->hosts_avoid_tls), NULL, host->name,
1347 host->address, NULL) != OK)
1349 uschar buffer2[4096];
1350 if (smtp_write_command(&outblock, FALSE, "STARTTLS\r\n") < 0)
1353 /* If there is an I/O error, transmission of this message is deferred. If
1354 there is a temporary rejection of STARRTLS and tls_tempfail_tryclear is
1355 false, we also defer. However, if there is a temporary rejection of STARTTLS
1356 and tls_tempfail_tryclear is true, or if there is an outright rejection of
1357 STARTTLS, we carry on. This means we will try to send the message in clear,
1358 unless the host is in hosts_require_tls (tested below). */
1360 if (!smtp_read_response(&inblock, buffer2, sizeof(buffer2), '2',
1361 ob->command_timeout))
1363 if (errno != 0 || buffer2[0] == 0 ||
1364 (buffer2[0] == '4' && !ob->tls_tempfail_tryclear))
1366 Ustrncpy(buffer, buffer2, sizeof(buffer));
1367 goto RESPONSE_FAILED;
1371 /* STARTTLS accepted: try to negotiate a TLS session. */
1376 int rc = tls_client_start(inblock.sock,
1379 ob->tls_certificate,
1382 ob->tls_verify_certificates,
1384 ob->tls_require_ciphers,
1385 #ifdef EXPERIMENTAL_OCSP
1386 ob->hosts_require_ocsp,
1388 ob->tls_dh_min_bits,
1389 ob->command_timeout);
1391 /* TLS negotiation failed; give an error. From outside, this function may
1392 be called again to try in clear on a new connection, if the options permit
1393 it for this host. */
1397 save_errno = ERRNO_TLSFAILURE;
1398 message = US"failure while setting up TLS session";
1403 /* TLS session is set up */
1405 for (addr = addrlist; addr != NULL; addr = addr->next)
1407 if (addr->transport_return == PENDING_DEFER)
1409 addr->cipher = tls_out.cipher;
1410 addr->peerdn = tls_out.peerdn;
1416 /* if smtps, we'll have smtp_command set to something else; always safe to
1418 smtp_command = big_buffer;
1420 /* If we started TLS, redo the EHLO/LHLO exchange over the secure channel. If
1421 helo_data is null, we are dealing with a connection that was passed from
1422 another process, and so we won't have expanded helo_data above. We have to
1423 expand it here. $sending_ip_address and $sending_port are set up right at the
1424 start of the Exim process (in exim.c). */
1426 if (tls_out.active >= 0)
1429 if (helo_data == NULL)
1431 helo_data = expand_string(ob->helo_data);
1432 if (helo_data == NULL)
1434 uschar *message = string_sprintf("failed to expand helo_data: %s",
1435 expand_string_message);
1436 set_errno(addrlist, 0, message, DEFER, FALSE);
1442 /* For SMTPS we need to wait for the initial OK response. */
1445 if (!smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
1446 ob->command_timeout)) goto RESPONSE_FAILED;
1450 greeting_cmd = "EHLO";
1453 greeting_cmd = "HELO";
1455 debug_printf("not sending EHLO (host matches hosts_avoid_esmtp)\n");
1458 if (smtp_write_command(&outblock, FALSE, "%s %s\r\n",
1459 lmtp? "LHLO" : greeting_cmd, helo_data) < 0)
1461 if (!smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
1462 ob->command_timeout))
1463 goto RESPONSE_FAILED;
1466 /* If the host is required to use a secure channel, ensure that we
1469 else if (verify_check_this_host(&(ob->hosts_require_tls), NULL, host->name,
1470 host->address, NULL) == OK)
1472 save_errno = ERRNO_TLSREQUIRED;
1473 message = string_sprintf("a TLS session is required for %s [%s], but %s",
1474 host->name, host->address,
1475 tls_offered? "an attempt to start TLS failed" :
1476 "the server did not offer TLS support");
1481 /* If TLS is active, we have just started it up and re-done the EHLO command,
1482 so its response needs to be analyzed. If TLS is not active and this is a
1483 continued session down a previously-used socket, we haven't just done EHLO, so
1486 if (continue_hostname == NULL
1488 || tls_out.active >= 0
1492 /* Set for IGNOREQUOTA if the response to LHLO specifies support and the
1493 lmtp_ignore_quota option was set. */
1495 igquotstr = (lmtp && ob->lmtp_ignore_quota &&
1496 pcre_exec(regex_IGNOREQUOTA, NULL, CS buffer, Ustrlen(CS buffer), 0,
1497 PCRE_EOPT, NULL, 0) >= 0)? US" IGNOREQUOTA" : US"";
1499 /* If the response to EHLO specified support for the SIZE parameter, note
1500 this, provided size_addition is non-negative. */
1502 smtp_use_size = esmtp && ob->size_addition >= 0 &&
1503 pcre_exec(regex_SIZE, NULL, CS buffer, Ustrlen(CS buffer), 0,
1504 PCRE_EOPT, NULL, 0) >= 0;
1506 /* Note whether the server supports PIPELINING. If hosts_avoid_esmtp matched
1507 the current host, esmtp will be false, so PIPELINING can never be used. If
1508 the current host matches hosts_avoid_pipelining, don't do it. */
1510 smtp_use_pipelining = esmtp &&
1511 verify_check_this_host(&(ob->hosts_avoid_pipelining), NULL, host->name,
1512 host->address, NULL) != OK &&
1513 pcre_exec(regex_PIPELINING, NULL, CS buffer, Ustrlen(CS buffer), 0,
1514 PCRE_EOPT, NULL, 0) >= 0;
1516 DEBUG(D_transport) debug_printf("%susing PIPELINING\n",
1517 smtp_use_pipelining? "" : "not ");
1519 #ifdef EXPERIMENTAL_PRDR
1520 prdr_offered = esmtp &&
1521 pcre_exec(regex_PRDR, NULL, CS buffer, Ustrlen(CS buffer), 0,
1522 PCRE_EOPT, NULL, 0) >= 0 &&
1523 verify_check_this_host(&(ob->hosts_try_prdr), NULL, host->name,
1524 host->address, NULL) == OK;
1527 {DEBUG(D_transport) debug_printf("PRDR usable\n");}
1530 /* Note if the response to EHLO specifies support for the AUTH extension.
1531 If it has, check that this host is one we want to authenticate to, and do
1532 the business. The host name and address must be available when the
1533 authenticator's client driver is running. */
1535 switch (yield = smtp_auth(buffer, sizeof(buffer), addrlist, host,
1536 ob, esmtp, &inblock, &outblock))
1538 default: goto SEND_QUIT;
1540 case FAIL_SEND: goto SEND_FAILED;
1541 case FAIL: goto RESPONSE_FAILED;
1545 /* The setting up of the SMTP call is now complete. Any subsequent errors are
1546 message-specific. */
1550 /* If there is a filter command specified for this transport, we can now
1551 set it up. This cannot be done until the identify of the host is known. */
1553 if (tblock->filter_command != NULL)
1557 sprintf(CS buffer, "%.50s transport", tblock->name);
1558 rc = transport_set_up_command(&transport_filter_argv, tblock->filter_command,
1559 TRUE, DEFER, addrlist, buffer, NULL);
1560 transport_filter_timeout = tblock->filter_timeout;
1562 /* On failure, copy the error to all addresses, abandon the SMTP call, and
1567 set_errno(addrlist->next, addrlist->basic_errno, addrlist->message, DEFER,
1575 /* For messages that have more than the maximum number of envelope recipients,
1576 we want to send several transactions down the same SMTP connection. (See
1577 comments in deliver.c as to how this reconciles, heuristically, with
1578 remote_max_parallel.) This optimization was added to Exim after the following
1579 code was already working. The simplest way to put it in without disturbing the
1580 code was to use a goto to jump back to this point when there is another
1581 transaction to handle. */
1584 sync_addr = first_addr;
1588 completed_address = FALSE;
1591 /* Initiate a message transfer. If we know the receiving MTA supports the SIZE
1592 qualification, send it, adding something to the message size to allow for
1593 imprecision and things that get added en route. Exim keeps the number of lines
1594 in a message, so we can give an accurate value for the original message, but we
1595 need some additional to handle added headers. (Double "." characters don't get
1596 included in the count.) */
1603 sprintf(CS p, " SIZE=%d", message_size+message_linecount+ob->size_addition);
1607 #ifdef EXPERIMENTAL_PRDR
1608 prdr_active = FALSE;
1611 for (addr = first_addr; addr; addr = addr->next)
1612 if (addr->transport_return == PENDING_DEFER)
1614 for (addr = addr->next; addr; addr = addr->next)
1615 if (addr->transport_return == PENDING_DEFER)
1616 { /* at least two recipients to send */
1618 sprintf(CS p, " PRDR"); p += 5;
1619 goto prdr_is_active;
1627 /* If an authenticated_sender override has been specified for this transport
1628 instance, expand it. If the expansion is forced to fail, and there was already
1629 an authenticated_sender for this message, the original value will be used.
1630 Other expansion failures are serious. An empty result is ignored, but there is
1631 otherwise no check - this feature is expected to be used with LMTP and other
1632 cases where non-standard addresses (e.g. without domains) might be required. */
1634 if (smtp_mail_auth_str(p, sizeof(buffer) - (p-buffer), addrlist, ob))
1637 /* From here until we send the DATA command, we can make use of PIPELINING
1638 if the server host supports it. The code has to be able to check the responses
1639 at any point, for when the buffer fills up, so we write it totally generally.
1640 When PIPELINING is off, each command written reports that it has flushed the
1643 pending_MAIL = TRUE; /* The block starts with MAIL */
1645 rc = smtp_write_command(&outblock, smtp_use_pipelining,
1646 "MAIL FROM:<%s>%s\r\n", return_path, buffer);
1647 mail_command = string_copy(big_buffer); /* Save for later error message */
1651 case -1: /* Transmission error */
1654 case +1: /* Block was sent */
1655 if (!smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
1656 ob->command_timeout))
1658 if (errno == 0 && buffer[0] == '4')
1660 errno = ERRNO_MAIL4XX;
1661 addrlist->more_errno |= ((buffer[1] - '0')*10 + buffer[2] - '0') << 8;
1663 goto RESPONSE_FAILED;
1665 pending_MAIL = FALSE;
1669 /* Pass over all the relevant recipient addresses for this host, which are the
1670 ones that have status PENDING_DEFER. If we are using PIPELINING, we can send
1671 several before we have to read the responses for those seen so far. This
1672 checking is done by a subroutine because it also needs to be done at the end.
1673 Send only up to max_rcpt addresses at a time, leaving first_addr pointing to
1674 the next one if not all are sent.
1676 In the MUA wrapper situation, we want to flush the PIPELINING buffer for the
1677 last address because we want to abort if any recipients have any kind of
1678 problem, temporary or permanent. We know that all recipient addresses will have
1679 the PENDING_DEFER status, because only one attempt is ever made, and we know
1680 that max_rcpt will be large, so all addresses will be done at once. */
1682 for (addr = first_addr;
1683 address_count < max_rcpt && addr != NULL;
1689 if (addr->transport_return != PENDING_DEFER) continue;
1692 no_flush = smtp_use_pipelining && (!mua_wrapper || addr->next != NULL);
1694 /* Now send the RCPT command, and process outstanding responses when
1695 necessary. After a timeout on RCPT, we just end the function, leaving the
1696 yield as OK, because this error can often mean that there is a problem with
1697 just one address, so we don't want to delay the host. */
1699 count = smtp_write_command(&outblock, no_flush, "RCPT TO:<%s>%s\r\n",
1700 transport_rcpt_address(addr, tblock->rcpt_include_affixes), igquotstr);
1701 if (count < 0) goto SEND_FAILED;
1704 switch(sync_responses(first_addr, tblock->rcpt_include_affixes,
1705 &sync_addr, host, count, ob->address_retry_include_sender,
1706 pending_MAIL, 0, &inblock, ob->command_timeout, buffer,
1709 case 3: ok = TRUE; /* 2xx & 5xx => OK & progress made */
1710 case 2: completed_address = TRUE; /* 5xx (only) => progress made */
1713 case 1: ok = TRUE; /* 2xx (only) => OK, but if LMTP, */
1714 if (!lmtp) completed_address = TRUE; /* can't tell about progress yet */
1715 case 0: /* No 2xx or 5xx, but no probs */
1718 case -1: goto END_OFF; /* Timeout on RCPT */
1719 default: goto RESPONSE_FAILED; /* I/O error, or any MAIL error */
1721 pending_MAIL = FALSE; /* Dealt with MAIL */
1723 } /* Loop for next address */
1725 /* If we are an MUA wrapper, abort if any RCPTs were rejected, either
1726 permanently or temporarily. We should have flushed and synced after the last
1731 address_item *badaddr;
1732 for (badaddr = first_addr; badaddr != NULL; badaddr = badaddr->next)
1734 if (badaddr->transport_return != PENDING_OK) break;
1736 if (badaddr != NULL)
1738 set_errno(addrlist, 0, badaddr->message, FAIL,
1739 testflag(badaddr, af_pass_message));
1744 /* If ok is TRUE, we know we have got at least one good recipient, and must now
1745 send DATA, but if it is FALSE (in the normal, non-wrapper case), we may still
1746 have a good recipient buffered up if we are pipelining. We don't want to waste
1747 time sending DATA needlessly, so we only send it if either ok is TRUE or if we
1748 are pipelining. The responses are all handled by sync_responses(). */
1750 if (ok || (smtp_use_pipelining && !mua_wrapper))
1752 int count = smtp_write_command(&outblock, FALSE, "DATA\r\n");
1753 if (count < 0) goto SEND_FAILED;
1754 switch(sync_responses(first_addr, tblock->rcpt_include_affixes, &sync_addr,
1755 host, count, ob->address_retry_include_sender, pending_MAIL,
1756 ok? +1 : -1, &inblock, ob->command_timeout, buffer, sizeof(buffer)))
1758 case 3: ok = TRUE; /* 2xx & 5xx => OK & progress made */
1759 case 2: completed_address = TRUE; /* 5xx (only) => progress made */
1762 case 1: ok = TRUE; /* 2xx (only) => OK, but if LMTP, */
1763 if (!lmtp) completed_address = TRUE; /* can't tell about progress yet */
1764 case 0: break; /* No 2xx or 5xx, but no probs */
1766 case -1: goto END_OFF; /* Timeout on RCPT */
1767 default: goto RESPONSE_FAILED; /* I/O error, or any MAIL/DATA error */
1771 /* Save the first address of the next batch. */
1775 /* If there were no good recipients (but otherwise there have been no
1776 problems), just set ok TRUE, since we have handled address-specific errors
1777 already. Otherwise, it's OK to send the message. Use the check/escape mechanism
1778 for handling the SMTP dot-handling protocol, flagging to apply to headers as
1779 well as body. Set the appropriate timeout value to be used for each chunk.
1780 (Haven't been able to make it work using select() for writing yet.) */
1782 if (!ok) ok = TRUE; else
1784 sigalrm_seen = FALSE;
1785 transport_write_timeout = ob->data_timeout;
1786 smtp_command = US"sending data block"; /* For error messages */
1787 DEBUG(D_transport|D_v)
1788 debug_printf(" SMTP>> writing message and terminating \".\"\n");
1789 transport_count = 0;
1790 #ifndef DISABLE_DKIM
1791 ok = dkim_transport_write_message(addrlist, inblock.sock,
1792 topt_use_crlf | topt_end_dot | topt_escape_headers |
1793 (tblock->body_only? topt_no_headers : 0) |
1794 (tblock->headers_only? topt_no_body : 0) |
1795 (tblock->return_path_add? topt_add_return_path : 0) |
1796 (tblock->delivery_date_add? topt_add_delivery_date : 0) |
1797 (tblock->envelope_to_add? topt_add_envelope_to : 0),
1798 0, /* No size limit */
1799 tblock->add_headers, tblock->remove_headers,
1800 US".", US"..", /* Escaping strings */
1801 tblock->rewrite_rules, tblock->rewrite_existflags,
1802 ob->dkim_private_key, ob->dkim_domain, ob->dkim_selector,
1803 ob->dkim_canon, ob->dkim_strict, ob->dkim_sign_headers
1806 ok = transport_write_message(addrlist, inblock.sock,
1807 topt_use_crlf | topt_end_dot | topt_escape_headers |
1808 (tblock->body_only? topt_no_headers : 0) |
1809 (tblock->headers_only? topt_no_body : 0) |
1810 (tblock->return_path_add? topt_add_return_path : 0) |
1811 (tblock->delivery_date_add? topt_add_delivery_date : 0) |
1812 (tblock->envelope_to_add? topt_add_envelope_to : 0),
1813 0, /* No size limit */
1814 tblock->add_headers, tblock->remove_headers,
1815 US".", US"..", /* Escaping strings */
1816 tblock->rewrite_rules, tblock->rewrite_existflags);
1819 /* transport_write_message() uses write() because it is called from other
1820 places to write to non-sockets. This means that under some OS (e.g. Solaris)
1821 it can exit with "Broken pipe" as its error. This really means that the
1822 socket got closed at the far end. */
1824 transport_write_timeout = 0; /* for subsequent transports */
1826 /* Failure can either be some kind of I/O disaster (including timeout),
1827 or the failure of a transport filter or the expansion of added headers. */
1831 buffer[0] = 0; /* There hasn't been a response */
1832 goto RESPONSE_FAILED;
1835 /* We used to send the terminating "." explicitly here, but because of
1836 buffering effects at both ends of TCP/IP connections, you don't gain
1837 anything by keeping it separate, so it might as well go in the final
1838 data buffer for efficiency. This is now done by setting the topt_end_dot
1841 smtp_command = US"end of data";
1843 #ifdef EXPERIMENTAL_PRDR
1844 /* For PRDR we optionally get a partial-responses warning
1845 * followed by the individual responses, before going on with
1846 * the overall response. If we don't get the warning then deal
1847 * with per non-PRDR. */
1850 ok = smtp_read_response(&inblock, buffer, sizeof(buffer), '3',
1852 if (!ok && errno == 0)
1855 case '2': prdr_active = FALSE;
1858 case '4': errno = ERRNO_DATA4XX;
1859 addrlist->more_errno |= ((buffer[1] - '0')*10 + buffer[2] - '0') << 8;
1866 /* For non-PRDR SMTP, we now read a single response that applies to the
1867 whole message. If it is OK, then all the addresses have been delivered. */
1871 ok = smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
1873 if (!ok && errno == 0 && buffer[0] == '4')
1875 errno = ERRNO_DATA4XX;
1876 addrlist->more_errno |= ((buffer[1] - '0')*10 + buffer[2] - '0') << 8;
1880 /* For LMTP, we get back a response for every RCPT command that we sent;
1881 some may be accepted and some rejected. For those that get a response, their
1882 status is fixed; any that are accepted have been handed over, even if later
1883 responses crash - at least, that's how I read RFC 2033.
1885 If all went well, mark the recipient addresses as completed, record which
1886 host/IPaddress they were delivered to, and cut out RSET when sending another
1887 message down the same channel. Write the completed addresses to the journal
1888 now so that they are recorded in case there is a crash of hardware or
1889 software before the spool gets updated. Also record the final SMTP
1890 confirmation if needed (for SMTP only). */
1895 int delivery_time = (int)(time(NULL) - start_delivery_time);
1898 uschar *conf = NULL;
1901 /* Make a copy of the host if it is local to this invocation
1902 of the transport. */
1906 thost = store_get(sizeof(host_item));
1908 thost->name = string_copy(host->name);
1909 thost->address = string_copy(host->address);
1913 /* Set up confirmation if needed - applies only to SMTP */
1915 if ((log_extra_selector & LX_smtp_confirmation) != 0 && !lmtp)
1917 uschar *s = string_printing(buffer);
1918 conf = (s == buffer)? (uschar *)string_copy(s) : s;
1921 /* Process all transported addresses - for LMTP or PRDR, read a status for
1924 for (addr = addrlist; addr != first_addr; addr = addr->next)
1926 if (addr->transport_return != PENDING_OK) continue;
1928 /* LMTP - if the response fails badly (e.g. timeout), use it for all the
1929 remaining addresses. Otherwise, it's a return code for just the one
1930 address. For temporary errors, add a retry item for the address so that
1931 it doesn't get tried again too soon. */
1933 #ifdef EXPERIMENTAL_PRDR
1934 if (lmtp || prdr_active)
1939 if (!smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
1942 if (errno != 0 || buffer[0] == 0) goto RESPONSE_FAILED;
1943 addr->message = string_sprintf(
1944 #ifdef EXPERIMENTAL_PRDR
1945 "%s error after %s: %s", prdr_active ? "PRDR":"LMTP",
1947 "LMTP error after %s: %s",
1949 big_buffer, string_printing(buffer));
1950 setflag(addr, af_pass_message); /* Allow message to go to user */
1951 if (buffer[0] == '5')
1952 addr->transport_return = FAIL;
1955 errno = ERRNO_DATA4XX;
1956 addr->more_errno |= ((buffer[1] - '0')*10 + buffer[2] - '0') << 8;
1957 addr->transport_return = DEFER;
1958 #ifdef EXPERIMENTAL_PRDR
1961 retry_add_item(addr, addr->address_retry_key, 0);
1965 completed_address = TRUE; /* NOW we can set this flag */
1966 if ((log_extra_selector & LX_smtp_confirmation) != 0)
1968 uschar *s = string_printing(buffer);
1969 conf = (s == buffer)? (uschar *)string_copy(s) : s;
1973 /* SMTP, or success return from LMTP for this address. Pass back the
1974 actual host that was used. */
1976 addr->transport_return = OK;
1977 addr->more_errno = delivery_time;
1978 addr->host_used = thost;
1979 addr->special_action = flag;
1980 addr->message = conf;
1981 #ifdef EXPERIMENTAL_PRDR
1982 if (prdr_active) addr->flags |= af_prdr_used;
1986 #ifdef EXPERIMENTAL_PRDR
1990 /* Update the journal. For homonymic addresses, use the base address plus
1991 the transport name. See lots of comments in deliver.c about the reasons
1992 for the complications when homonyms are involved. Just carry on after
1993 write error, as it may prove possible to update the spool file later. */
1995 if (testflag(addr, af_homonym))
1996 sprintf(CS buffer, "%.500s/%s\n", addr->unique + 3, tblock->name);
1998 sprintf(CS buffer, "%.500s\n", addr->unique);
2000 DEBUG(D_deliver) debug_printf("journalling %s", buffer);
2001 len = Ustrlen(CS buffer);
2002 if (write(journal_fd, buffer, len) != len)
2003 log_write(0, LOG_MAIN|LOG_PANIC, "failed to write journal for "
2004 "%s: %s", buffer, strerror(errno));
2008 #ifdef EXPERIMENTAL_PRDR
2011 /* PRDR - get the final, overall response. For any non-success
2012 upgrade all the address statuses. */
2013 ok = smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
2017 if(errno == 0 && buffer[0] == '4')
2019 errno = ERRNO_DATA4XX;
2020 addrlist->more_errno |= ((buffer[1] - '0')*10 + buffer[2] - '0') << 8;
2022 for (addr = addrlist; addr != first_addr; addr = addr->next)
2023 if (buffer[0] == '5' || addr->transport_return == OK)
2024 addr->transport_return = PENDING_OK; /* allow set_errno action */
2025 goto RESPONSE_FAILED;
2028 /* Update the journal, or setup retry. */
2029 for (addr = addrlist; addr != first_addr; addr = addr->next)
2030 if (addr->transport_return == OK)
2032 if (testflag(addr, af_homonym))
2033 sprintf(CS buffer, "%.500s/%s\n", addr->unique + 3, tblock->name);
2035 sprintf(CS buffer, "%.500s\n", addr->unique);
2037 DEBUG(D_deliver) debug_printf("journalling(PRDR) %s", buffer);
2038 len = Ustrlen(CS buffer);
2039 if (write(journal_fd, buffer, len) != len)
2040 log_write(0, LOG_MAIN|LOG_PANIC, "failed to write journal for "
2041 "%s: %s", buffer, strerror(errno));
2043 else if (addr->transport_return == DEFER)
2044 retry_add_item(addr, addr->address_retry_key, -2);
2048 /* Ensure the journal file is pushed out to disk. */
2050 if (EXIMfsync(journal_fd) < 0)
2051 log_write(0, LOG_MAIN|LOG_PANIC, "failed to fsync journal: %s",
2057 /* Handle general (not specific to one address) failures here. The value of ok
2058 is used to skip over this code on the falling through case. A timeout causes a
2059 deferral. Other errors may defer or fail according to the response code, and
2060 may set up a special errno value, e.g. after connection chopped, which is
2061 assumed if errno == 0 and there is no text in the buffer. If control reaches
2062 here during the setting up phase (i.e. before MAIL FROM) then always defer, as
2063 the problem is not related to this specific message. */
2072 send_quit = check_response(host, &save_errno, addrlist->more_errno,
2073 buffer, &code, &message, &pass_message);
2079 message = US string_sprintf("send() to %s [%s] failed: %s",
2080 host->name, host->address, strerror(save_errno));
2084 /* This label is jumped to directly when a TLS negotiation has failed,
2085 or was not done for a host for which it is required. Values will be set
2086 in message and save_errno, and setting_up will always be true. Treat as
2087 a temporary error. */
2094 /* If the failure happened while setting up the call, see if the failure was
2095 a 5xx response (this will either be on connection, or following HELO - a 5xx
2096 after EHLO causes it to try HELO). If so, fail all addresses, as this host is
2097 never going to accept them. For other errors during setting up (timeouts or
2098 whatever), defer all addresses, and yield DEFER, so that the host is not
2099 tried again for a while. */
2102 ok = FALSE; /* For when reached by GOTO */
2108 set_errno(addrlist, save_errno, message, FAIL, pass_message);
2112 set_errno(addrlist, save_errno, message, DEFER, pass_message);
2117 /* We want to handle timeouts after MAIL or "." and loss of connection after
2118 "." specially. They can indicate a problem with the sender address or with
2119 the contents of the message rather than a real error on the connection. These
2120 cases are treated in the same way as a 4xx response. This next bit of code
2121 does the classification. */
2132 message_error = TRUE;
2136 message_error = Ustrncmp(smtp_command,"MAIL",4) == 0 ||
2137 Ustrncmp(smtp_command,"end ",4) == 0;
2140 case ERRNO_SMTPCLOSED:
2141 message_error = Ustrncmp(smtp_command,"end ",4) == 0;
2145 message_error = FALSE;
2149 /* Handle the cases that are treated as message errors. These are:
2151 (a) negative response or timeout after MAIL
2152 (b) negative response after DATA
2153 (c) negative response or timeout or dropped connection after "."
2155 It won't be a negative response or timeout after RCPT, as that is dealt
2156 with separately above. The action in all cases is to set an appropriate
2157 error code for all the addresses, but to leave yield set to OK because the
2158 host itself has not failed. Of course, it might in practice have failed
2159 when we've had a timeout, but if so, we'll discover that at the next
2160 delivery attempt. For a temporary error, set the message_defer flag, and
2161 write to the logs for information if this is not the last host. The error
2162 for the last host will be logged as part of the address's log line. */
2166 if (mua_wrapper) code = '5'; /* Force hard failure in wrapper mode */
2167 set_errno(addrlist, save_errno, message, (code == '5')? FAIL : DEFER,
2170 /* If there's an errno, the message contains just the identity of
2173 if (code != '5') /* Anything other than 5 is treated as temporary */
2176 message = US string_sprintf("%s: %s", message, strerror(save_errno));
2177 if (host->next != NULL) log_write(0, LOG_MAIN, "%s", message);
2178 deliver_msglog("%s %s\n", tod_stamp(tod_log), message);
2179 *message_defer = TRUE;
2183 /* Otherwise, we have an I/O error or a timeout other than after MAIL or
2184 ".", or some other transportation error. We defer all addresses and yield
2185 DEFER, except for the case of failed add_headers expansion, or a transport
2186 filter failure, when the yield should be ERROR, to stop it trying other
2191 yield = (save_errno == ERRNO_CHHEADER_FAIL ||
2192 save_errno == ERRNO_FILTER_FAIL)? ERROR : DEFER;
2193 set_errno(addrlist, save_errno, message, DEFER, pass_message);
2199 /* If all has gone well, send_quit will be set TRUE, implying we can end the
2200 SMTP session tidily. However, if there were too many addresses to send in one
2201 message (indicated by first_addr being non-NULL) we want to carry on with the
2202 rest of them. Also, it is desirable to send more than one message down the SMTP
2203 connection if there are several waiting, provided we haven't already sent so
2204 many as to hit the configured limit. The function transport_check_waiting looks
2205 for a waiting message and returns its id. Then transport_pass_socket tries to
2206 set up a continued delivery by passing the socket on to another process. The
2207 variable send_rset is FALSE if a message has just been successfully transfered.
2209 If we are already sending down a continued channel, there may be further
2210 addresses not yet delivered that are aimed at the same host, but which have not
2211 been passed in this run of the transport. In this case, continue_more will be
2212 true, and all we should do is send RSET if necessary, and return, leaving the
2215 However, if no address was disposed of, i.e. all addresses got 4xx errors, we
2216 do not want to continue with other messages down the same channel, because that
2217 can lead to looping between two or more messages, all with the same,
2218 temporarily failing address(es). [The retry information isn't updated yet, so
2219 new processes keep on trying.] We probably also don't want to try more of this
2220 message's addresses either.
2222 If we have started a TLS session, we have to end it before passing the
2223 connection to a new process. However, not all servers can handle this (Exim
2224 can), so we do not pass such a connection on if the host matches
2225 hosts_nopass_tls. */
2228 debug_printf("ok=%d send_quit=%d send_rset=%d continue_more=%d "
2229 "yield=%d first_address is %sNULL\n", ok, send_quit, send_rset,
2230 continue_more, yield, (first_addr == NULL)? "":"not ");
2232 if (completed_address && ok && send_quit)
2235 if (first_addr != NULL || continue_more ||
2237 (tls_out.active < 0 ||
2238 verify_check_this_host(&(ob->hosts_nopass_tls), NULL, host->name,
2239 host->address, NULL) != OK)
2241 transport_check_waiting(tblock->name, host->name,
2242 tblock->connection_max_messages, new_message_id, &more)
2250 if (! (ok = smtp_write_command(&outblock, FALSE, "RSET\r\n") >= 0))
2252 msg = US string_sprintf("send() to %s [%s] failed: %s", host->name,
2253 host->address, strerror(save_errno));
2256 else if (! (ok = smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
2257 ob->command_timeout)))
2260 send_quit = check_response(host, &errno, 0, buffer, &code, &msg,
2264 DEBUG(D_transport) debug_printf("%s\n", msg);
2269 /* Either RSET was not needed, or it succeeded */
2273 if (first_addr != NULL) /* More addresses still to be sent */
2274 { /* in this run of the transport */
2275 continue_sequence++; /* Causes * in logging */
2278 if (continue_more) return yield; /* More addresses for another run */
2280 /* Pass the socket to a new Exim process. Before doing so, we must shut
2281 down TLS. Not all MTAs allow for the continuation of the SMTP session
2282 when TLS is shut down. We test for this by sending a new EHLO. If we
2283 don't get a good response, we don't attempt to pass the socket on. */
2286 if (tls_out.active >= 0)
2288 tls_close(FALSE, TRUE);
2292 ok = smtp_write_command(&outblock,FALSE,"EHLO %s\r\n",helo_data) >= 0 &&
2293 smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
2294 ob->command_timeout);
2298 /* If the socket is successfully passed, we musn't send QUIT (or
2299 indeed anything!) from here. */
2301 if (ok && transport_pass_socket(tblock->name, host->name, host->address,
2302 new_message_id, inblock.sock))
2308 /* If RSET failed and there are addresses left, they get deferred. */
2310 else set_errno(first_addr, errno, msg, DEFER, FALSE);
2314 /* End off tidily with QUIT unless the connection has died or the socket has
2315 been passed to another process. There has been discussion on the net about what
2316 to do after sending QUIT. The wording of the RFC suggests that it is necessary
2317 to wait for a response, but on the other hand, there isn't anything one can do
2318 with an error response, other than log it. Exim used to do that. However,
2319 further discussion suggested that it is positively advantageous not to wait for
2320 the response, but to close the session immediately. This is supposed to move
2321 the TCP/IP TIME_WAIT state from the server to the client, thereby removing some
2322 load from the server. (Hosts that are both servers and clients may not see much
2323 difference, of course.) Further discussion indicated that this was safe to do
2324 on Unix systems which have decent implementations of TCP/IP that leave the
2325 connection around for a while (TIME_WAIT) after the application has gone away.
2326 This enables the response sent by the server to be properly ACKed rather than
2327 timed out, as can happen on broken TCP/IP implementations on other OS.
2329 This change is being made on 31-Jul-98. After over a year of trouble-free
2330 operation, the old commented-out code was removed on 17-Sep-99. */
2333 if (send_quit) (void)smtp_write_command(&outblock, FALSE, "QUIT\r\n");
2338 tls_close(FALSE, TRUE);
2341 /* Close the socket, and return the appropriate value, first setting
2342 continue_transport and continue_hostname NULL to prevent any other addresses
2343 that may include the host from trying to re-use a continuation socket. This
2344 works because the NULL setting is passed back to the calling process, and
2345 remote_max_parallel is forced to 1 when delivering over an existing connection,
2347 If all went well and continue_more is set, we shouldn't actually get here if
2348 there are further addresses, as the return above will be taken. However,
2349 writing RSET might have failed, or there may be other addresses whose hosts are
2350 specified in the transports, and therefore not visible at top level, in which
2351 case continue_more won't get set. */
2353 (void)close(inblock.sock);
2354 continue_transport = NULL;
2355 continue_hostname = NULL;
2362 /*************************************************
2363 * Closedown entry point *
2364 *************************************************/
2366 /* This function is called when exim is passed an open smtp channel
2367 from another incarnation, but the message which it has been asked
2368 to deliver no longer exists. The channel is on stdin.
2370 We might do fancy things like looking for another message to send down
2371 the channel, but if the one we sought has gone, it has probably been
2372 delivered by some other process that itself will seek further messages,
2373 so just close down our connection.
2375 Argument: pointer to the transport instance block
2380 smtp_transport_closedown(transport_instance *tblock)
2382 smtp_transport_options_block *ob =
2383 (smtp_transport_options_block *)(tblock->options_block);
2384 smtp_inblock inblock;
2385 smtp_outblock outblock;
2387 uschar inbuffer[4096];
2388 uschar outbuffer[16];
2390 inblock.sock = fileno(stdin);
2391 inblock.buffer = inbuffer;
2392 inblock.buffersize = sizeof(inbuffer);
2393 inblock.ptr = inbuffer;
2394 inblock.ptrend = inbuffer;
2396 outblock.sock = inblock.sock;
2397 outblock.buffersize = sizeof(outbuffer);
2398 outblock.buffer = outbuffer;
2399 outblock.ptr = outbuffer;
2400 outblock.cmd_count = 0;
2401 outblock.authenticating = FALSE;
2403 (void)smtp_write_command(&outblock, FALSE, "QUIT\r\n");
2404 (void)smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
2405 ob->command_timeout);
2406 (void)close(inblock.sock);
2411 /*************************************************
2412 * Prepare addresses for delivery *
2413 *************************************************/
2415 /* This function is called to flush out error settings from previous delivery
2416 attempts to other hosts. It also records whether we got here via an MX record
2417 or not in the more_errno field of the address. We are interested only in
2418 addresses that are still marked DEFER - others may have got delivered to a
2419 previously considered IP address. Set their status to PENDING_DEFER to indicate
2420 which ones are relevant this time.
2423 addrlist the list of addresses
2424 host the host we are delivering to
2426 Returns: the first address for this delivery
2429 static address_item *
2430 prepare_addresses(address_item *addrlist, host_item *host)
2432 address_item *first_addr = NULL;
2434 for (addr = addrlist; addr != NULL; addr = addr->next)
2436 if (addr->transport_return != DEFER) continue;
2437 if (first_addr == NULL) first_addr = addr;
2438 addr->transport_return = PENDING_DEFER;
2439 addr->basic_errno = 0;
2440 addr->more_errno = (host->mx >= 0)? 'M' : 'A';
2441 addr->message = NULL;
2443 addr->cipher = NULL;
2444 addr->peerdn = NULL;
2452 /*************************************************
2453 * Main entry point *
2454 *************************************************/
2456 /* See local README for interface details. As this is a remote transport, it is
2457 given a chain of addresses to be delivered in one connection, if possible. It
2458 always returns TRUE, indicating that each address has its own independent
2459 status set, except if there is a setting up problem, in which case it returns
2463 smtp_transport_entry(
2464 transport_instance *tblock, /* data for this instantiation */
2465 address_item *addrlist) /* addresses we are working on */
2469 int hosts_defer = 0;
2471 int hosts_looked_up = 0;
2472 int hosts_retry = 0;
2473 int hosts_serial = 0;
2474 int hosts_total = 0;
2475 int total_hosts_tried = 0;
2477 BOOL expired = TRUE;
2478 BOOL continuing = continue_hostname != NULL;
2479 uschar *expanded_hosts = NULL;
2481 uschar *tid = string_sprintf("%s transport", tblock->name);
2482 smtp_transport_options_block *ob =
2483 (smtp_transport_options_block *)(tblock->options_block);
2484 host_item *hostlist = addrlist->host_list;
2485 host_item *host = NULL;
2489 debug_printf("%s transport entered\n", tblock->name);
2490 for (addr = addrlist; addr != NULL; addr = addr->next)
2491 debug_printf(" %s\n", addr->address);
2492 if (continuing) debug_printf("already connected to %s [%s]\n",
2493 continue_hostname, continue_host_address);
2496 /* Set the flag requesting that these hosts be added to the waiting
2497 database if the delivery fails temporarily or if we are running with
2498 queue_smtp or a 2-stage queue run. This gets unset for certain
2499 kinds of error, typically those that are specific to the message. */
2501 update_waiting = TRUE;
2503 /* If a host list is not defined for the addresses - they must all have the
2504 same one in order to be passed to a single transport - or if the transport has
2505 a host list with hosts_override set, use the host list supplied with the
2506 transport. It is an error for this not to exist. */
2508 if (hostlist == NULL || (ob->hosts_override && ob->hosts != NULL))
2510 if (ob->hosts == NULL)
2512 addrlist->message = string_sprintf("%s transport called with no hosts set",
2514 addrlist->transport_return = PANIC;
2515 return FALSE; /* Only top address has status */
2518 DEBUG(D_transport) debug_printf("using the transport's hosts: %s\n",
2521 /* If the transport's host list contains no '$' characters, and we are not
2522 randomizing, it is fixed and therefore a chain of hosts can be built once
2523 and for all, and remembered for subsequent use by other calls to this
2524 transport. If, on the other hand, the host list does contain '$', or we are
2525 randomizing its order, we have to rebuild it each time. In the fixed case,
2526 as the hosts string will never be used again, it doesn't matter that we
2527 replace all the : characters with zeros. */
2529 if (ob->hostlist == NULL)
2531 uschar *s = ob->hosts;
2533 if (Ustrchr(s, '$') != NULL)
2535 expanded_hosts = expand_string(s);
2536 if (expanded_hosts == NULL)
2538 addrlist->message = string_sprintf("failed to expand list of hosts "
2539 "\"%s\" in %s transport: %s", s, tblock->name, expand_string_message);
2540 addrlist->transport_return = search_find_defer? DEFER : PANIC;
2541 return FALSE; /* Only top address has status */
2543 DEBUG(D_transport) debug_printf("expanded list of hosts \"%s\" to "
2544 "\"%s\"\n", s, expanded_hosts);
2548 if (ob->hosts_randomize) s = expanded_hosts = string_copy(s);
2550 host_build_hostlist(&hostlist, s, ob->hosts_randomize);
2552 /* Check that the expansion yielded something useful. */
2553 if (hostlist == NULL)
2556 string_sprintf("%s transport has empty hosts setting", tblock->name);
2557 addrlist->transport_return = PANIC;
2558 return FALSE; /* Only top address has status */
2561 /* If there was no expansion of hosts, save the host list for
2564 if (expanded_hosts == NULL) ob->hostlist = hostlist;
2567 /* This is not the first time this transport has been run in this delivery;
2568 the host list was built previously. */
2570 else hostlist = ob->hostlist;
2573 /* The host list was supplied with the address. If hosts_randomize is set, we
2574 must sort it into a random order if it did not come from MX records and has not
2575 already been randomized (but don't bother if continuing down an existing
2578 else if (ob->hosts_randomize && hostlist->mx == MX_NONE && !continuing)
2580 host_item *newlist = NULL;
2581 while (hostlist != NULL)
2583 host_item *h = hostlist;
2584 hostlist = hostlist->next;
2586 h->sort_key = random_number(100);
2588 if (newlist == NULL)
2593 else if (h->sort_key < newlist->sort_key)
2600 host_item *hh = newlist;
2601 while (hh->next != NULL)
2603 if (h->sort_key < hh->next->sort_key) break;
2611 hostlist = addrlist->host_list = newlist;
2615 /* Sort out the default port. */
2617 if (!smtp_get_port(ob->port, addrlist, &port, tid)) return FALSE;
2620 /* For each host-plus-IP-address on the list:
2622 . If this is a continued delivery and the host isn't the one with the
2623 current connection, skip.
2625 . If the status is unusable (i.e. previously failed or retry checked), skip.
2627 . If no IP address set, get the address, either by turning the name into
2628 an address, calling gethostbyname if gethostbyname is on, or by calling
2629 the DNS. The DNS may yield multiple addresses, in which case insert the
2630 extra ones into the list.
2632 . Get the retry data if not previously obtained for this address and set the
2633 field which remembers the state of this address. Skip if the retry time is
2634 not reached. If not, remember whether retry data was found. The retry string
2635 contains both the name and the IP address.
2637 . Scan the list of addresses and mark those whose status is DEFER as
2638 PENDING_DEFER. These are the only ones that will be processed in this cycle
2641 . Make a delivery attempt - addresses marked PENDING_DEFER will be tried.
2642 Some addresses may be successfully delivered, others may fail, and yet
2643 others may get temporary errors and so get marked DEFER.
2645 . The return from the delivery attempt is OK if a connection was made and a
2646 valid SMTP dialogue was completed. Otherwise it is DEFER.
2648 . If OK, add a "remove" retry item for this host/IPaddress, if any.
2650 . If fail to connect, or other defer state, add a retry item.
2652 . If there are any addresses whose status is still DEFER, carry on to the
2653 next host/IPaddress, unless we have tried the number of hosts given
2654 by hosts_max_try or hosts_max_try_hardlimit; otherwise return. Note that
2655 there is some fancy logic for hosts_max_try that means its limit can be
2656 overstepped in some circumstances.
2658 If we get to the end of the list, all hosts have deferred at least one address,
2659 or not reached their retry times. If delay_after_cutoff is unset, it requests a
2660 delivery attempt to those hosts whose last try was before the arrival time of
2661 the current message. To cope with this, we have to go round the loop a second
2662 time. After that, set the status and error data for any addresses that haven't
2663 had it set already. */
2665 for (cutoff_retry = 0; expired &&
2666 cutoff_retry < ((ob->delay_after_cutoff)? 1 : 2);
2669 host_item *nexthost = NULL;
2670 int unexpired_hosts_tried = 0;
2672 for (host = hostlist;
2674 unexpired_hosts_tried < ob->hosts_max_try &&
2675 total_hosts_tried < ob->hosts_max_try_hardlimit;
2681 BOOL serialized = FALSE;
2682 BOOL host_is_expired = FALSE;
2683 BOOL message_defer = FALSE;
2684 BOOL ifchanges = FALSE;
2685 BOOL some_deferred = FALSE;
2686 address_item *first_addr = NULL;
2687 uschar *interface = NULL;
2688 uschar *retry_host_key = NULL;
2689 uschar *retry_message_key = NULL;
2690 uschar *serialize_key = NULL;
2692 /* Default next host is next host. :-) But this can vary if the
2693 hosts_max_try limit is hit (see below). It may also be reset if a host
2694 address is looked up here (in case the host was multihomed). */
2696 nexthost = host->next;
2698 /* If the address hasn't yet been obtained from the host name, look it up
2699 now, unless the host is already marked as unusable. If it is marked as
2700 unusable, it means that the router was unable to find its IP address (in
2701 the DNS or wherever) OR we are in the 2nd time round the cutoff loop, and
2702 the lookup failed last time. We don't get this far if *all* MX records
2703 point to non-existent hosts; that is treated as a hard error.
2705 We can just skip this host entirely. When the hosts came from the router,
2706 the address will timeout based on the other host(s); when the address is
2707 looked up below, there is an explicit retry record added.
2709 Note that we mustn't skip unusable hosts if the address is not unset; they
2710 may be needed as expired hosts on the 2nd time round the cutoff loop. */
2712 if (host->address == NULL)
2714 int new_port, flags;
2716 uschar *canonical_name;
2718 if (host->status >= hstatus_unusable)
2720 DEBUG(D_transport) debug_printf("%s has no address and is unusable - skipping\n",
2725 DEBUG(D_transport) debug_printf("getting address for %s\n", host->name);
2727 /* The host name is permitted to have an attached port. Find it, and
2728 strip it from the name. Just remember it for now. */
2730 new_port = host_item_get_port(host);
2732 /* Count hosts looked up */
2736 /* Find by name if so configured, or if it's an IP address. We don't
2737 just copy the IP address, because we need the test-for-local to happen. */
2739 flags = HOST_FIND_BY_A;
2740 if (ob->dns_qualify_single) flags |= HOST_FIND_QUALIFY_SINGLE;
2741 if (ob->dns_search_parents) flags |= HOST_FIND_SEARCH_PARENTS;
2743 if (ob->gethostbyname || string_is_ip_address(host->name, NULL) != 0)
2744 rc = host_find_byname(host, NULL, flags, &canonical_name, TRUE);
2746 rc = host_find_bydns(host, NULL, flags, NULL, NULL, NULL,
2747 &canonical_name, NULL);
2749 /* Update the host (and any additional blocks, resulting from
2750 multihoming) with a host-specific port, if any. */
2752 for (hh = host; hh != nexthost; hh = hh->next) hh->port = new_port;
2754 /* Failure to find the host at this time (usually DNS temporary failure)
2755 is really a kind of routing failure rather than a transport failure.
2756 Therefore we add a retry item of the routing kind, not to stop us trying
2757 to look this name up here again, but to ensure the address gets timed
2758 out if the failures go on long enough. A complete failure at this point
2759 commonly points to a configuration error, but the best action is still
2760 to carry on for the next host. */
2762 if (rc == HOST_FIND_AGAIN || rc == HOST_FIND_FAILED)
2764 retry_add_item(addrlist, string_sprintf("R:%s", host->name), 0);
2766 if (rc == HOST_FIND_AGAIN) hosts_defer++; else hosts_fail++;
2767 DEBUG(D_transport) debug_printf("rc = %s for %s\n", (rc == HOST_FIND_AGAIN)?
2768 "HOST_FIND_AGAIN" : "HOST_FIND_FAILED", host->name);
2769 host->status = hstatus_unusable;
2771 for (addr = addrlist; addr != NULL; addr = addr->next)
2773 if (addr->transport_return != DEFER) continue;
2774 addr->basic_errno = ERRNO_UNKNOWNHOST;
2776 string_sprintf("failed to lookup IP address for %s", host->name);
2781 /* If the host is actually the local host, we may have a problem, or
2782 there may be some cunning configuration going on. In the problem case,
2783 log things and give up. The default transport status is already DEFER. */
2785 if (rc == HOST_FOUND_LOCAL && !ob->allow_localhost)
2787 for (addr = addrlist; addr != NULL; addr = addr->next)
2789 addr->basic_errno = 0;
2790 addr->message = string_sprintf("%s transport found host %s to be "
2791 "local", tblock->name, host->name);
2795 } /* End of block for IP address lookup */
2797 /* If this is a continued delivery, we are interested only in the host
2798 which matches the name of the existing open channel. The check is put
2799 here after the local host lookup, in case the name gets expanded as a
2800 result of the lookup. Set expired FALSE, to save the outer loop executing
2803 if (continuing && (Ustrcmp(continue_hostname, host->name) != 0 ||
2804 Ustrcmp(continue_host_address, host->address) != 0))
2807 continue; /* With next host */
2810 /* Reset the default next host in case a multihomed host whose addresses
2811 are not looked up till just above added to the host list. */
2813 nexthost = host->next;
2815 /* If queue_smtp is set (-odqs or the first part of a 2-stage run), or the
2816 domain is in queue_smtp_domains, we don't actually want to attempt any
2817 deliveries. When doing a queue run, queue_smtp_domains is always unset. If
2818 there is a lookup defer in queue_smtp_domains, proceed as if the domain
2819 were not in it. We don't want to hold up all SMTP deliveries! Except when
2820 doing a two-stage queue run, don't do this if forcing. */
2822 if ((!deliver_force || queue_2stage) && (queue_smtp ||
2823 match_isinlist(addrlist->domain, &queue_smtp_domains, 0,
2824 &domainlist_anchor, NULL, MCL_DOMAIN, TRUE, NULL) == OK))
2827 for (addr = addrlist; addr != NULL; addr = addr->next)
2829 if (addr->transport_return != DEFER) continue;
2830 addr->message = US"domain matches queue_smtp_domains, or -odqs set";
2832 continue; /* With next host */
2835 /* Count hosts being considered - purely for an intelligent comment
2836 if none are usable. */
2840 /* Set $host and $host address now in case they are needed for the
2841 interface expansion or the serialize_hosts check; they remain set if an
2842 actual delivery happens. */
2844 deliver_host = host->name;
2845 deliver_host_address = host->address;
2847 /* Set up a string for adding to the retry key if the port number is not
2848 the standard SMTP port. A host may have its own port setting that overrides
2851 pistring = string_sprintf(":%d", (host->port == PORT_NONE)?
2853 if (Ustrcmp(pistring, ":25") == 0) pistring = US"";
2855 /* Select IPv4 or IPv6, and choose an outgoing interface. If the interface
2856 string changes upon expansion, we must add it to the key that is used for
2857 retries, because connections to the same host from a different interface
2858 should be treated separately. */
2860 host_af = (Ustrchr(host->address, ':') == NULL)? AF_INET : AF_INET6;
2861 if (!smtp_get_interface(ob->interface, host_af, addrlist, &ifchanges,
2864 if (ifchanges) pistring = string_sprintf("%s/%s", pistring, interface);
2866 /* The first time round the outer loop, check the status of the host by
2867 inspecting the retry data. The second time round, we are interested only
2868 in expired hosts that haven't been tried since this message arrived. */
2870 if (cutoff_retry == 0)
2872 /* Ensure the status of the address is set by checking retry data if
2873 necessary. There maybe host-specific retry data (applicable to all
2874 messages) and also data for retries of a specific message at this host.
2875 If either of these retry records are actually read, the keys used are
2876 returned to save recomputing them later. */
2878 host_is_expired = retry_check_address(addrlist->domain, host, pistring,
2879 ob->retry_include_ip_address, &retry_host_key, &retry_message_key);
2881 DEBUG(D_transport) debug_printf("%s [%s]%s status = %s\n", host->name,
2882 (host->address == NULL)? US"" : host->address, pistring,
2883 (host->status == hstatus_usable)? "usable" :
2884 (host->status == hstatus_unusable)? "unusable" :
2885 (host->status == hstatus_unusable_expired)? "unusable (expired)" : "?");
2887 /* Skip this address if not usable at this time, noting if it wasn't
2888 actually expired, both locally and in the address. */
2890 switch (host->status)
2892 case hstatus_unusable:
2894 setflag(addrlist, af_retry_skipped);
2897 case hstatus_unusable_expired:
2900 case hwhy_retry: hosts_retry++; break;
2901 case hwhy_failed: hosts_fail++; break;
2902 case hwhy_deferred: hosts_defer++; break;
2905 /* If there was a retry message key, implying that previously there
2906 was a message-specific defer, we don't want to update the list of
2907 messages waiting for these hosts. */
2909 if (retry_message_key != NULL) update_waiting = FALSE;
2910 continue; /* With the next host or IP address */
2914 /* Second time round the loop: if the address is set but expired, and
2915 the message is newer than the last try, let it through. */
2919 if (host->address == NULL ||
2920 host->status != hstatus_unusable_expired ||
2921 host->last_try > received_time)
2924 debug_printf("trying expired host %s [%s]%s\n",
2925 host->name, host->address, pistring);
2926 host_is_expired = TRUE;
2929 /* Setting "expired=FALSE" doesn't actually mean not all hosts are expired;
2930 it remains TRUE only if all hosts are expired and none are actually tried.
2935 /* If this host is listed as one to which access must be serialized,
2936 see if another Exim process has a connection to it, and if so, skip
2937 this host. If not, update the database to record our connection to it
2938 and remember this for later deletion. Do not do any of this if we are
2939 sending the message down a pre-existing connection. */
2942 verify_check_this_host(&(ob->serialize_hosts), NULL, host->name,
2943 host->address, NULL) == OK)
2945 serialize_key = string_sprintf("host-serialize-%s", host->name);
2946 if (!enq_start(serialize_key))
2949 debug_printf("skipping host %s because another Exim process "
2950 "is connected to it\n", host->name);
2957 /* OK, we have an IP address that is not waiting for its retry time to
2958 arrive (it might be expired) OR (second time round the loop) we have an
2959 expired host that hasn't been tried since the message arrived. Have a go
2960 at delivering the message to it. First prepare the addresses by flushing
2961 out the result of previous attempts, and finding the first address that
2962 is still to be delivered. */
2964 first_addr = prepare_addresses(addrlist, host);
2966 DEBUG(D_transport) debug_printf("delivering %s to %s [%s] (%s%s)\n",
2967 message_id, host->name, host->address, addrlist->address,
2968 (addrlist->next == NULL)? "" : ", ...");
2970 set_process_info("delivering %s to %s [%s] (%s%s)",
2971 message_id, host->name, host->address, addrlist->address,
2972 (addrlist->next == NULL)? "" : ", ...");
2974 /* This is not for real; don't do the delivery. If there are
2975 any remaining hosts, list them. */
2980 set_errno(addrlist, 0, NULL, OK, FALSE);
2981 for (addr = addrlist; addr != NULL; addr = addr->next)
2983 addr->host_used = host;
2984 addr->special_action = '*';
2985 addr->message = US"delivery bypassed by -N option";
2989 debug_printf("*** delivery by %s transport bypassed by -N option\n"
2990 "*** host and remaining hosts:\n", tblock->name);
2991 for (host2 = host; host2 != NULL; host2 = host2->next)
2992 debug_printf(" %s [%s]\n", host2->name,
2993 (host2->address == NULL)? US"unset" : host2->address);
2998 /* This is for real. If the host is expired, we don't count it for
2999 hosts_max_retry. This ensures that all hosts must expire before an address
3000 is timed out, unless hosts_max_try_hardlimit (which protects against
3001 lunatic DNS configurations) is reached.
3003 If the host is not expired and we are about to hit the hosts_max_retry
3004 limit, check to see if there is a subsequent hosts with a different MX
3005 value. If so, make that the next host, and don't count this one. This is a
3006 heuristic to make sure that different MXs do get tried. With a normal kind
3007 of retry rule, they would get tried anyway when the earlier hosts were
3008 delayed, but if the domain has a "retry every time" type of rule - as is
3009 often used for the the very large ISPs, that won't happen. */
3013 if (!host_is_expired && ++unexpired_hosts_tried >= ob->hosts_max_try)
3017 debug_printf("hosts_max_try limit reached with this host\n");
3018 for (h = host; h != NULL; h = h->next)
3019 if (h->mx != host->mx) break;
3023 unexpired_hosts_tried--;
3024 DEBUG(D_transport) debug_printf("however, a higher MX host exists "
3025 "and will be tried\n");
3029 /* Attempt the delivery. */
3031 total_hosts_tried++;
3032 rc = smtp_deliver(addrlist, host, host_af, port, interface, tblock,
3033 expanded_hosts != NULL, &message_defer, FALSE);
3036 OK => connection made, each address contains its result;
3037 message_defer is set for message-specific defers (when all
3038 recipients are marked defer)
3039 DEFER => there was a non-message-specific delivery problem;
3040 ERROR => there was a problem setting up the arguments for a filter,
3041 or there was a problem with expanding added headers
3044 /* If the result is not OK, there was a non-message-specific problem.
3045 If the result is DEFER, we need to write to the logs saying what happened
3046 for this particular host, except in the case of authentication and TLS
3047 failures, where the log has already been written. If all hosts defer a
3048 general message is written at the end. */
3050 if (rc == DEFER && first_addr->basic_errno != ERRNO_AUTHFAIL &&
3051 first_addr->basic_errno != ERRNO_TLSFAILURE)
3052 write_logs(first_addr, host);
3054 /* If STARTTLS was accepted, but there was a failure in setting up the
3055 TLS session (usually a certificate screwup), and the host is not in
3056 hosts_require_tls, and tls_tempfail_tryclear is true, try again, with
3057 TLS forcibly turned off. We have to start from scratch with a new SMTP
3058 connection. That's why the retry is done from here, not from within
3059 smtp_deliver(). [Rejections of STARTTLS itself don't screw up the
3060 session, so the in-clear transmission after those errors, if permitted,
3061 happens inside smtp_deliver().] */
3064 if (rc == DEFER && first_addr->basic_errno == ERRNO_TLSFAILURE &&
3065 ob->tls_tempfail_tryclear &&
3066 verify_check_this_host(&(ob->hosts_require_tls), NULL, host->name,
3067 host->address, NULL) != OK)
3069 log_write(0, LOG_MAIN, "TLS session failure: delivering unencrypted "
3070 "to %s [%s] (not in hosts_require_tls)", host->name, host->address);
3071 first_addr = prepare_addresses(addrlist, host);
3072 rc = smtp_deliver(addrlist, host, host_af, port, interface, tblock,
3073 expanded_hosts != NULL, &message_defer, TRUE);
3074 if (rc == DEFER && first_addr->basic_errno != ERRNO_AUTHFAIL)
3075 write_logs(first_addr, host);
3080 /* Delivery attempt finished */
3082 rs = (rc == OK)? US"OK" : (rc == DEFER)? US"DEFER" : (rc == ERROR)?
3085 set_process_info("delivering %s: just tried %s [%s] for %s%s: result %s",
3086 message_id, host->name, host->address, addrlist->address,
3087 (addrlist->next == NULL)? "" : " (& others)", rs);
3089 /* Release serialization if set up */
3091 if (serialized) enq_end(serialize_key);
3093 /* If the result is DEFER, or if a host retry record is known to exist, we
3094 need to add an item to the retry chain for updating the retry database
3095 at the end of delivery. We only need to add the item to the top address,
3096 of course. Also, if DEFER, we mark the IP address unusable so as to skip it
3097 for any other delivery attempts using the same address. (It is copied into
3098 the unusable tree at the outer level, so even if different address blocks
3099 contain the same address, it still won't get tried again.) */
3101 if (rc == DEFER || retry_host_key != NULL)
3103 int delete_flag = (rc != DEFER)? rf_delete : 0;
3104 if (retry_host_key == NULL)
3106 retry_host_key = ob->retry_include_ip_address?
3107 string_sprintf("T:%S:%s%s", host->name, host->address, pistring) :
3108 string_sprintf("T:%S%s", host->name, pistring);
3111 /* If a delivery of another message over an existing SMTP connection
3112 yields DEFER, we do NOT set up retry data for the host. This covers the
3113 case when there are delays in routing the addresses in the second message
3114 that are so long that the server times out. This is alleviated by not
3115 routing addresses that previously had routing defers when handling an
3116 existing connection, but even so, this case may occur (e.g. if a
3117 previously happily routed address starts giving routing defers). If the
3118 host is genuinely down, another non-continued message delivery will
3119 notice it soon enough. */
3121 if (delete_flag != 0 || !continuing)
3122 retry_add_item(first_addr, retry_host_key, rf_host | delete_flag);
3124 /* We may have tried an expired host, if its retry time has come; ensure
3125 the status reflects the expiry for the benefit of any other addresses. */
3129 host->status = (host_is_expired)?
3130 hstatus_unusable_expired : hstatus_unusable;
3131 host->why = hwhy_deferred;
3135 /* If message_defer is set (host was OK, but every recipient got deferred
3136 because of some message-specific problem), or if that had happened
3137 previously so that a message retry key exists, add an appropriate item
3138 to the retry chain. Note that if there was a message defer but now there is
3139 a host defer, the message defer record gets deleted. That seems perfectly
3140 reasonable. Also, stop the message from being remembered as waiting
3141 for specific hosts. */
3143 if (message_defer || retry_message_key != NULL)
3145 int delete_flag = message_defer? 0 : rf_delete;
3146 if (retry_message_key == NULL)
3148 retry_message_key = ob->retry_include_ip_address?
3149 string_sprintf("T:%S:%s%s:%s", host->name, host->address, pistring,
3151 string_sprintf("T:%S%s:%s", host->name, pistring, message_id);
3153 retry_add_item(addrlist, retry_message_key,
3154 rf_message | rf_host | delete_flag);
3155 update_waiting = FALSE;
3158 /* Any return other than DEFER (that is, OK or ERROR) means that the
3159 addresses have got their final statuses filled in for this host. In the OK
3160 case, see if any of them are deferred. */
3164 for (addr = addrlist; addr != NULL; addr = addr->next)
3166 if (addr->transport_return == DEFER)
3168 some_deferred = TRUE;
3174 /* If no addresses deferred or the result was ERROR, return. We do this for
3175 ERROR because a failing filter set-up or add_headers expansion is likely to
3176 fail for any host we try. */
3178 if (rc == ERROR || (rc == OK && !some_deferred))
3180 DEBUG(D_transport) debug_printf("Leaving %s transport\n", tblock->name);
3181 return TRUE; /* Each address has its status */
3184 /* If the result was DEFER or some individual addresses deferred, let
3185 the loop run to try other hosts with the deferred addresses, except for the
3186 case when we were trying to deliver down an existing channel and failed.
3187 Don't try any other hosts in this case. */
3189 if (continuing) break;
3191 /* If the whole delivery, or some individual addresses, were deferred and
3192 there are more hosts that could be tried, do not count this host towards
3193 the hosts_max_try limit if the age of the message is greater than the
3194 maximum retry time for this host. This means we may try try all hosts,
3195 ignoring the limit, when messages have been around for some time. This is
3196 important because if we don't try all hosts, the address will never time
3197 out. NOTE: this does not apply to hosts_max_try_hardlimit. */
3199 if ((rc == DEFER || some_deferred) && nexthost != NULL)
3202 retry_config *retry = retry_find_config(host->name, NULL, 0, 0);
3204 if (retry != NULL && retry->rules != NULL)
3206 retry_rule *last_rule;
3207 for (last_rule = retry->rules;
3208 last_rule->next != NULL;
3209 last_rule = last_rule->next);
3210 timedout = time(NULL) - received_time > last_rule->timeout;
3212 else timedout = TRUE; /* No rule => timed out */
3216 unexpired_hosts_tried--;
3217 DEBUG(D_transport) debug_printf("temporary delivery error(s) override "
3218 "hosts_max_try (message older than host's retry time)\n");
3221 } /* End of loop for trying multiple hosts. */
3223 /* This is the end of the loop that repeats iff expired is TRUE and
3224 ob->delay_after_cutoff is FALSE. The second time round we will
3225 try those hosts that haven't been tried since the message arrived. */
3229 debug_printf("all IP addresses skipped or deferred at least one address\n");
3230 if (expired && !ob->delay_after_cutoff && cutoff_retry == 0)
3231 debug_printf("retrying IP addresses not tried since message arrived\n");
3236 /* Get here if all IP addresses are skipped or defer at least one address. In
3237 MUA wrapper mode, this will happen only for connection or other non-message-
3238 specific failures. Force the delivery status for all addresses to FAIL. */
3242 for (addr = addrlist; addr != NULL; addr = addr->next)
3243 addr->transport_return = FAIL;
3247 /* In the normal, non-wrapper case, add a standard message to each deferred
3248 address if there hasn't been an error, that is, if it hasn't actually been
3249 tried this time. The variable "expired" will be FALSE if any deliveries were
3250 actually tried, or if there was at least one host that was not expired. That
3251 is, it is TRUE only if no deliveries were tried and all hosts were expired. If
3252 a delivery has been tried, an error code will be set, and the failing of the
3253 message is handled by the retry code later.
3255 If queue_smtp is set, or this transport was called to send a subsequent message
3256 down an existing TCP/IP connection, and something caused the host not to be
3257 found, we end up here, but can detect these cases and handle them specially. */
3259 for (addr = addrlist; addr != NULL; addr = addr->next)
3261 /* If host is not NULL, it means that we stopped processing the host list
3262 because of hosts_max_try or hosts_max_try_hardlimit. In the former case, this
3263 means we need to behave as if some hosts were skipped because their retry
3264 time had not come. Specifically, this prevents the address from timing out.
3265 However, if we have hit hosts_max_try_hardlimit, we want to behave as if all
3266 hosts were tried. */
3270 if (total_hosts_tried >= ob->hosts_max_try_hardlimit)
3273 debug_printf("hosts_max_try_hardlimit reached: behave as if all "
3274 "hosts were tried\n");
3279 debug_printf("hosts_max_try limit caused some hosts to be skipped\n");
3280 setflag(addr, af_retry_skipped);
3284 if (queue_smtp) /* no deliveries attempted */
3286 addr->transport_return = DEFER;
3287 addr->basic_errno = 0;
3288 addr->message = US"SMTP delivery explicitly queued";
3291 else if (addr->transport_return == DEFER &&
3292 (addr->basic_errno == ERRNO_UNKNOWNERROR || addr->basic_errno == 0) &&
3293 addr->message == NULL)
3295 addr->basic_errno = ERRNO_HRETRY;
3296 if (continue_hostname != NULL)
3298 addr->message = US"no host found for existing SMTP connection";
3302 setflag(addr, af_pass_message); /* This is not a security risk */
3303 addr->message = (ob->delay_after_cutoff)?
3304 US"retry time not reached for any host after a long failure period" :
3305 US"all hosts have been failing for a long time and were last tried "
3306 "after this message arrived";
3308 /* If we are already using fallback hosts, or there are no fallback hosts
3309 defined, convert the result to FAIL to cause a bounce. */
3311 if (addr->host_list == addr->fallback_hosts ||
3312 addr->fallback_hosts == NULL)
3313 addr->transport_return = FAIL;
3317 if (hosts_retry == hosts_total)
3318 addr->message = US"retry time not reached for any host";
3319 else if (hosts_fail == hosts_total)
3320 addr->message = US"all host address lookups failed permanently";
3321 else if (hosts_defer == hosts_total)
3322 addr->message = US"all host address lookups failed temporarily";
3323 else if (hosts_serial == hosts_total)
3324 addr->message = US"connection limit reached for all hosts";
3325 else if (hosts_fail+hosts_defer == hosts_total)
3326 addr->message = US"all host address lookups failed";
3327 else addr->message = US"some host address lookups failed and retry time "
3328 "not reached for other hosts or connection limit reached";
3333 /* Update the database which keeps information about which messages are waiting
3334 for which hosts to become available. For some message-specific errors, the
3335 update_waiting flag is turned off because we don't want follow-on deliveries in
3336 those cases. If this transport instance is explicitly limited to one message
3337 per connection then follow-on deliveries are not possible and there's no need
3338 to create/update the per-transport wait-<transport_name> database. */
3340 if (update_waiting && tblock->connection_max_messages != 1)
3341 transport_update_waiting(hostlist, tblock->name);
3345 DEBUG(D_transport) debug_printf("Leaving %s transport\n", tblock->name);
3347 return TRUE; /* Each address has its status */
3350 /* End of transport/smtp.c */
git://git.exim.org / users / jgh / exim.git / blob