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) }
159 #ifdef EXPERIMENTAL_TPDA
160 ,{ "tpda_host_defer_action", opt_stringptr,
161 (void *)offsetof(smtp_transport_options_block, tpda_host_defer_action) },
165 /* Size of the options list. An extern variable has to be used so that its
166 address can appear in the tables drtables.c. */
168 int smtp_transport_options_count =
169 sizeof(smtp_transport_options)/sizeof(optionlist);
171 /* Default private options block for the smtp transport. */
173 smtp_transport_options_block smtp_transport_option_defaults = {
175 NULL, /* fallback_hosts */
177 NULL, /* fallback_hostlist */
178 NULL, /* authenticated_sender */
179 US"$primary_hostname", /* helo_data */
180 NULL, /* interface */
182 US"smtp", /* protocol */
184 NULL, /* serialize_hosts */
185 NULL, /* hosts_try_auth */
186 NULL, /* hosts_require_auth */
187 #ifdef EXPERIMENTAL_PRDR
188 NULL, /* hosts_try_prdr */
190 #ifdef EXPERIMENTAL_OCSP
191 NULL, /* hosts_require_ocsp */
193 NULL, /* hosts_require_tls */
194 NULL, /* hosts_avoid_tls */
195 US"*", /* hosts_verify_avoid_tls */
196 NULL, /* hosts_avoid_pipelining */
197 NULL, /* hosts_avoid_esmtp */
198 NULL, /* hosts_nopass_tls */
199 5*60, /* command_timeout */
200 5*60, /* connect_timeout; shorter system default overrides */
201 5*60, /* data timeout */
202 10*60, /* final timeout */
203 1024, /* size_addition */
204 5, /* hosts_max_try */
205 50, /* hosts_max_try_hardlimit */
206 TRUE, /* address_retry_include_sender */
207 FALSE, /* allow_localhost */
208 FALSE, /* authenticated_sender_force */
209 FALSE, /* gethostbyname */
210 TRUE, /* dns_qualify_single */
211 FALSE, /* dns_search_parents */
212 TRUE, /* delay_after_cutoff */
213 FALSE, /* hosts_override */
214 FALSE, /* hosts_randomize */
215 TRUE, /* keepalive */
216 FALSE, /* lmtp_ignore_quota */
217 TRUE /* retry_include_ip_address */
219 ,NULL, /* tls_certificate */
221 NULL, /* tls_privatekey */
222 NULL, /* tls_require_ciphers */
223 NULL, /* gnutls_require_kx */
224 NULL, /* gnutls_require_mac */
225 NULL, /* gnutls_require_proto */
227 NULL, /* tls_verify_certificates */
228 EXIM_CLIENT_DH_DEFAULT_MIN_BITS,
229 /* tls_dh_min_bits */
230 TRUE /* tls_tempfail_tryclear */
233 ,NULL, /* dkim_canon */
234 NULL, /* dkim_domain */
235 NULL, /* dkim_private_key */
236 NULL, /* dkim_selector */
237 NULL, /* dkim_sign_headers */
238 NULL /* dkim_strict */
240 #ifdef EXPERIMENTAL_TPDA
241 ,NULL /* tpda_host_defer_action */
248 static uschar *smtp_command; /* Points to last cmd for error messages */
249 static uschar *mail_command; /* Points to MAIL cmd for error messages */
250 static BOOL update_waiting; /* TRUE to update the "wait" database */
253 /*************************************************
254 * Setup entry point *
255 *************************************************/
257 /* This function is called when the transport is about to be used,
258 but before running it in a sub-process. It is used for two things:
260 (1) To set the fallback host list in addresses, when delivering.
261 (2) To pass back the interface, port, protocol, and other options, for use
262 during callout verification.
265 tblock pointer to the transport instance block
266 addrlist list of addresses about to be transported
267 tf if not NULL, pointer to block in which to return options
268 uid the uid that will be set (not used)
269 gid the gid that will be set (not used)
270 errmsg place for error message (not used)
272 Returns: OK always (FAIL, DEFER not used)
276 smtp_transport_setup(transport_instance *tblock, address_item *addrlist,
277 transport_feedback *tf, uid_t uid, gid_t gid, uschar **errmsg)
279 smtp_transport_options_block *ob =
280 (smtp_transport_options_block *)(tblock->options_block);
282 errmsg = errmsg; /* Keep picky compilers happy */
286 /* Pass back options if required. This interface is getting very messy. */
290 tf->interface = ob->interface;
292 tf->protocol = ob->protocol;
293 tf->hosts = ob->hosts;
294 tf->hosts_override = ob->hosts_override;
295 tf->hosts_randomize = ob->hosts_randomize;
296 tf->gethostbyname = ob->gethostbyname;
297 tf->qualify_single = ob->dns_qualify_single;
298 tf->search_parents = ob->dns_search_parents;
299 tf->helo_data = ob->helo_data;
302 /* Set the fallback host list for all the addresses that don't have fallback
303 host lists, provided that the local host wasn't present in the original host
306 if (!testflag(addrlist, af_local_host_removed))
308 for (; addrlist != NULL; addrlist = addrlist->next)
309 if (addrlist->fallback_hosts == NULL)
310 addrlist->fallback_hosts = ob->fallback_hostlist;
318 /*************************************************
319 * Initialization entry point *
320 *************************************************/
322 /* Called for each instance, after its options have been read, to
323 enable consistency checks to be done, or anything else that needs
326 Argument: pointer to the transport instance block
331 smtp_transport_init(transport_instance *tblock)
333 smtp_transport_options_block *ob =
334 (smtp_transport_options_block *)(tblock->options_block);
336 /* Retry_use_local_part defaults FALSE if unset */
338 if (tblock->retry_use_local_part == TRUE_UNSET)
339 tblock->retry_use_local_part = FALSE;
341 /* Set the default port according to the protocol */
343 if (ob->port == NULL)
344 ob->port = (strcmpic(ob->protocol, US"lmtp") == 0)? US"lmtp" :
345 (strcmpic(ob->protocol, US"smtps") == 0)? US"smtps" : US"smtp";
347 /* Set up the setup entry point, to be called before subprocesses for this
350 tblock->setup = smtp_transport_setup;
352 /* Complain if any of the timeouts are zero. */
354 if (ob->command_timeout <= 0 || ob->data_timeout <= 0 ||
355 ob->final_timeout <= 0)
356 log_write(0, LOG_PANIC_DIE|LOG_CONFIG,
357 "command, data, or final timeout value is zero for %s transport",
360 /* If hosts_override is set and there are local hosts, set the global
361 flag that stops verify from showing router hosts. */
363 if (ob->hosts_override && ob->hosts != NULL) tblock->overrides_hosts = TRUE;
365 /* If there are any fallback hosts listed, build a chain of host items
366 for them, but do not do any lookups at this time. */
368 host_build_hostlist(&(ob->fallback_hostlist), ob->fallback_hosts, FALSE);
375 /*************************************************
376 * Set delivery info into all active addresses *
377 *************************************************/
379 /* Only addresses whose status is >= PENDING are relevant. A lesser
380 status means that an address is not currently being processed.
383 addrlist points to a chain of addresses
384 errno_value to put in each address's errno field
385 msg to put in each address's message field
386 rc to put in each address's transport_return field
387 pass_message if TRUE, set the "pass message" flag in the address
389 If errno_value has the special value ERRNO_CONNECTTIMEOUT, ETIMEDOUT is put in
390 the errno field, and RTEF_CTOUT is ORed into the more_errno field, to indicate
391 this particular type of timeout.
397 set_errno(address_item *addrlist, int errno_value, uschar *msg, int rc,
402 if (errno_value == ERRNO_CONNECTTIMEOUT)
404 errno_value = ETIMEDOUT;
405 orvalue = RTEF_CTOUT;
407 for (addr = addrlist; addr != NULL; addr = addr->next)
409 if (addr->transport_return < PENDING) continue;
410 addr->basic_errno = errno_value;
411 addr->more_errno |= orvalue;
415 if (pass_message) setflag(addr, af_pass_message);
417 addr->transport_return = rc;
423 /*************************************************
424 * Check an SMTP response *
425 *************************************************/
427 /* This function is given an errno code and the SMTP response buffer
428 to analyse, together with the host identification for generating messages. It
429 sets an appropriate message and puts the first digit of the response code into
430 the yield variable. If no response was actually read, a suitable digit is
434 host the current host, to get its name for messages
435 errno_value pointer to the errno value
436 more_errno from the top address for use with ERRNO_FILTER_FAIL
437 buffer the SMTP response buffer
438 yield where to put a one-digit SMTP response code
439 message where to put an errror message
440 pass_message set TRUE if message is an SMTP response
442 Returns: TRUE if an SMTP "QUIT" command should be sent, else FALSE
445 static BOOL check_response(host_item *host, int *errno_value, int more_errno,
446 uschar *buffer, int *yield, uschar **message, BOOL *pass_message)
450 if (smtp_use_pipelining &&
451 (Ustrcmp(smtp_command, "MAIL") == 0 ||
452 Ustrcmp(smtp_command, "RCPT") == 0 ||
453 Ustrcmp(smtp_command, "DATA") == 0))
456 *yield = '4'; /* Default setting is to give a temporary error */
458 /* Handle response timeout */
460 if (*errno_value == ETIMEDOUT)
462 *message = US string_sprintf("SMTP timeout while connected to %s [%s] "
463 "after %s%s", host->name, host->address, pl, smtp_command);
464 if (transport_count > 0)
465 *message = US string_sprintf("%s (%d bytes written)", *message,
470 /* Handle malformed SMTP response */
472 if (*errno_value == ERRNO_SMTPFORMAT)
474 uschar *malfresp = string_printing(buffer);
475 while (isspace(*malfresp)) malfresp++;
477 *message = string_sprintf("Malformed SMTP reply (an empty line) from "
478 "%s [%s] in response to %s%s", host->name, host->address, pl,
481 *message = string_sprintf("Malformed SMTP reply from %s [%s] in response "
482 "to %s%s: %s", host->name, host->address, pl, smtp_command, malfresp);
486 /* Handle a failed filter process error; can't send QUIT as we mustn't
489 if (*errno_value == ERRNO_FILTER_FAIL)
491 *message = US string_sprintf("transport filter process failed (%d)%s",
493 (more_errno == EX_EXECFAILED)? ": unable to execute command" : "");
497 /* Handle a failed add_headers expansion; can't send QUIT as we mustn't
500 if (*errno_value == ERRNO_CHHEADER_FAIL)
503 US string_sprintf("failed to expand headers_add or headers_remove: %s",
504 expand_string_message);
508 /* Handle failure to write a complete data block */
510 if (*errno_value == ERRNO_WRITEINCOMPLETE)
512 *message = US string_sprintf("failed to write a data block");
516 /* Handle error responses from the remote mailer. */
520 uschar *s = string_printing(buffer);
521 *message = US string_sprintf("SMTP error from remote mail server after %s%s: "
522 "host %s [%s]: %s", pl, smtp_command, host->name, host->address, s);
523 *pass_message = TRUE;
528 /* No data was read. If there is no errno, this must be the EOF (i.e.
529 connection closed) case, which causes deferral. An explicit connection reset
530 error has the same effect. Otherwise, put the host's identity in the message,
531 leaving the errno value to be interpreted as well. In all cases, we have to
532 assume the connection is now dead. */
534 if (*errno_value == 0 || *errno_value == ECONNRESET)
536 *errno_value = ERRNO_SMTPCLOSED;
537 *message = US string_sprintf("Remote host %s [%s] closed connection "
538 "in response to %s%s", host->name, host->address, pl, smtp_command);
540 else *message = US string_sprintf("%s [%s]", host->name, host->address);
547 /*************************************************
548 * Write error message to logs *
549 *************************************************/
551 /* This writes to the main log and to the message log.
554 addr the address item containing error information
555 host the current host
561 write_logs(address_item *addr, host_item *host)
563 if (addr->message != NULL)
565 uschar *message = addr->message;
566 if (addr->basic_errno > 0)
567 message = string_sprintf("%s: %s", message, strerror(addr->basic_errno));
568 log_write(0, LOG_MAIN, "%s", message);
569 deliver_msglog("%s %s\n", tod_stamp(tod_log), message);
574 ((log_extra_selector & LX_outgoing_port) != 0)?
575 string_sprintf("%s [%s]:%d", host->name, host->address,
576 (host->port == PORT_NONE)? 25 : host->port)
578 string_sprintf("%s [%s]", host->name, host->address);
579 log_write(0, LOG_MAIN, "%s %s", msg, strerror(addr->basic_errno));
580 deliver_msglog("%s %s %s\n", tod_stamp(tod_log), msg,
581 strerror(addr->basic_errno));
587 #ifdef EXPERIMENTAL_TPDA
588 /*************************************************
589 * Post-defer action *
590 *************************************************/
592 /* This expands an arbitrary per-transport string.
593 It might, for example, be used to write to the database log.
596 ob transport options block
597 addr the address item containing error information
598 host the current host
604 tpda_deferred(smtp_transport_options_block *ob, address_item *addr, host_item *host)
606 uschar *action = ob->tpda_host_defer_action;
610 tpda_delivery_ip = string_copy(host->address);
611 tpda_delivery_port = (host->port == PORT_NONE)? 25 : host->port;
612 tpda_delivery_fqdn = string_copy(host->name);
613 tpda_delivery_local_part = string_copy(addr->local_part);
614 tpda_delivery_domain = string_copy(addr->domain);
615 tpda_defer_errno = addr->basic_errno;
617 tpda_defer_errstr = addr->message
618 ? addr->basic_errno > 0
619 ? string_sprintf("%s: %s", addr->message, strerror(addr->basic_errno))
620 : string_copy(addr->message)
621 : addr->basic_errno > 0
622 ? string_copy(strerror(addr->basic_errno))
626 debug_printf(" TPDA(host defer): tpda_host_defer_action=|%s| tpda_delivery_IP=%s\n",
627 action, tpda_delivery_ip);
629 router_name = addr->router->name;
630 transport_name = addr->transport->name;
631 expand_string(action);
632 router_name = transport_name = NULL;
638 /*************************************************
639 * Synchronize SMTP responses *
640 *************************************************/
642 /* This function is called from smtp_deliver() to receive SMTP responses from
643 the server, and match them up with the commands to which they relate. When
644 PIPELINING is not in use, this function is called after every command, and is
645 therefore somewhat over-engineered, but it is simpler to use a single scheme
646 that works both with and without PIPELINING instead of having two separate sets
649 The set of commands that are buffered up with pipelining may start with MAIL
650 and may end with DATA; in between are RCPT commands that correspond to the
651 addresses whose status is PENDING_DEFER. All other commands (STARTTLS, AUTH,
652 etc.) are never buffered.
654 Errors after MAIL or DATA abort the whole process leaving the response in the
655 buffer. After MAIL, pending responses are flushed, and the original command is
656 re-instated in big_buffer for error messages. For RCPT commands, the remote is
657 permitted to reject some recipient addresses while accepting others. However
658 certain errors clearly abort the whole process. Set the value in
659 transport_return to PENDING_OK if the address is accepted. If there is a
660 subsequent general error, it will get reset accordingly. If not, it will get
661 converted to OK at the end.
664 addrlist the complete address list
665 include_affixes TRUE if affixes include in RCPT
666 sync_addr ptr to the ptr of the one to start scanning at (updated)
667 host the host we are connected to
668 count the number of responses to read
670 include_sender true if 4xx retry is to include the sender it its key
671 pending_MAIL true if the first response is for MAIL
672 pending_DATA 0 if last command sent was not DATA
673 +1 if previously had a good recipient
674 -1 if not previously had a good recipient
675 inblock incoming SMTP block
676 timeout timeout value
677 buffer buffer for reading response
678 buffsize size of buffer
680 Returns: 3 if at least one address had 2xx and one had 5xx
681 2 if at least one address had 5xx but none had 2xx
682 1 if at least one host had a 2xx response, but none had 5xx
683 0 no address had 2xx or 5xx but no errors (all 4xx, or just DATA)
684 -1 timeout while reading RCPT response
685 -2 I/O or other non-response error for RCPT
686 -3 DATA or MAIL failed - errno and buffer set
690 sync_responses(address_item *addrlist, BOOL include_affixes,
691 address_item **sync_addr, host_item *host, int count,
692 BOOL address_retry_include_sender, BOOL pending_MAIL,
693 int pending_DATA, smtp_inblock *inblock, int timeout, uschar *buffer,
696 address_item *addr = *sync_addr;
699 /* Handle the response for a MAIL command. On error, reinstate the original
700 command in big_buffer for error message use, and flush any further pending
701 responses before returning, except after I/O errors and timeouts. */
706 if (!smtp_read_response(inblock, buffer, buffsize, '2', timeout))
708 Ustrcpy(big_buffer, mail_command); /* Fits, because it came from there! */
709 if (errno == 0 && buffer[0] != 0)
711 uschar flushbuffer[4096];
713 if (buffer[0] == '4')
715 save_errno = ERRNO_MAIL4XX;
716 addr->more_errno |= ((buffer[1] - '0')*10 + buffer[2] - '0') << 8;
720 if (!smtp_read_response(inblock, flushbuffer, sizeof(flushbuffer),
722 && (errno != 0 || flushbuffer[0] == 0))
731 if (pending_DATA) count--; /* Number of RCPT responses to come */
733 /* Read and handle the required number of RCPT responses, matching each one up
734 with an address by scanning for the next address whose status is PENDING_DEFER.
739 while (addr->transport_return != PENDING_DEFER) addr = addr->next;
741 /* The address was accepted */
743 if (smtp_read_response(inblock, buffer, buffsize, '2', timeout))
746 addr->transport_return = PENDING_OK;
748 /* If af_dr_retry_exists is set, there was a routing delay on this address;
749 ensure that any address-specific retry record is expunged. We do this both
750 for the basic key and for the version that also includes the sender. */
752 if (testflag(addr, af_dr_retry_exists))
754 uschar *altkey = string_sprintf("%s:<%s>", addr->address_retry_key,
756 retry_add_item(addr, altkey, rf_delete);
757 retry_add_item(addr, addr->address_retry_key, rf_delete);
761 /* Timeout while reading the response */
763 else if (errno == ETIMEDOUT)
765 int save_errno = errno;
766 uschar *message = string_sprintf("SMTP timeout while connected to %s [%s] "
767 "after RCPT TO:<%s>", host->name, host->address,
768 transport_rcpt_address(addr, include_affixes));
769 set_errno(addrlist, save_errno, message, DEFER, FALSE);
770 retry_add_item(addr, addr->address_retry_key, 0);
771 update_waiting = FALSE;
775 /* Handle other errors in obtaining an SMTP response by returning -1. This
776 will cause all the addresses to be deferred. Restore the SMTP command in
777 big_buffer for which we are checking the response, so the error message
780 else if (errno != 0 || buffer[0] == 0)
782 string_format(big_buffer, big_buffer_size, "RCPT TO:<%s>",
783 transport_rcpt_address(addr, include_affixes));
787 /* Handle SMTP permanent and temporary response codes. */
792 string_sprintf("SMTP error from remote mail server after RCPT TO:<%s>: "
793 "host %s [%s]: %s", transport_rcpt_address(addr, include_affixes),
794 host->name, host->address, string_printing(buffer));
795 setflag(addr, af_pass_message);
796 deliver_msglog("%s %s\n", tod_stamp(tod_log), addr->message);
798 /* The response was 5xx */
800 if (buffer[0] == '5')
802 addr->transport_return = FAIL;
806 /* The response was 4xx */
810 addr->transport_return = DEFER;
811 addr->basic_errno = ERRNO_RCPT4XX;
812 addr->more_errno |= ((buffer[1] - '0')*10 + buffer[2] - '0') << 8;
814 /* Log temporary errors if there are more hosts to be tried. */
816 if (host->next != NULL) log_write(0, LOG_MAIN, "%s", addr->message);
818 /* Do not put this message on the list of those waiting for specific
819 hosts, as otherwise it is likely to be tried too often. */
821 update_waiting = FALSE;
823 /* Add a retry item for the address so that it doesn't get tried again
824 too soon. If address_retry_include_sender is true, add the sender address
827 if (address_retry_include_sender)
829 uschar *altkey = string_sprintf("%s:<%s>", addr->address_retry_key,
831 retry_add_item(addr, altkey, 0);
833 else retry_add_item(addr, addr->address_retry_key, 0);
836 } /* Loop for next RCPT response */
838 /* Update where to start at for the next block of responses, unless we
839 have already handled all the addresses. */
841 if (addr != NULL) *sync_addr = addr->next;
843 /* Handle a response to DATA. If we have not had any good recipients, either
844 previously or in this block, the response is ignored. */
846 if (pending_DATA != 0 &&
847 !smtp_read_response(inblock, buffer, buffsize, '3', timeout))
852 if (pending_DATA > 0 || (yield & 1) != 0)
854 if (errno == 0 && buffer[0] == '4')
856 errno = ERRNO_DATA4XX;
857 addrlist->more_errno |= ((buffer[1] - '0')*10 + buffer[2] - '0') << 8;
861 (void)check_response(host, &errno, 0, buffer, &code, &msg, &pass_message);
862 DEBUG(D_transport) debug_printf("%s\nerror for DATA ignored: pipelining "
863 "is in use and there were no good recipients\n", msg);
866 /* All responses read and handled; MAIL (if present) received 2xx and DATA (if
867 present) received 3xx. If any RCPTs were handled and yielded anything other
868 than 4xx, yield will be set non-zero. */
875 /* Do the client side of smtp-level authentication */
878 buffer EHLO response from server (gets overwritten)
879 addrlist chain of potential addresses to deliver
880 host host to deliver to
882 ibp, obp comms channel control blocks
885 OK Success, or failed (but not required): global "smtp_authenticated" set
886 DEFER Failed authentication (and was required)
887 ERROR Internal problem
889 FAIL_SEND Failed communications - transmit
894 smtp_auth(uschar *buffer, unsigned bufsize, address_item *addrlist, host_item *host,
895 smtp_transport_options_block *ob, BOOL is_esmtp,
896 smtp_inblock *ibp, smtp_outblock *obp)
899 uschar *fail_reason = US"server did not advertise AUTH support";
901 smtp_authenticated = FALSE;
902 client_authenticator = client_authenticated_id = client_authenticated_sender = NULL;
903 require_auth = verify_check_this_host(&(ob->hosts_require_auth), NULL,
904 host->name, host->address, NULL);
906 if (is_esmtp && !regex_AUTH) regex_AUTH =
907 regex_must_compile(US"\\n250[\\s\\-]AUTH\\s+([\\-\\w\\s]+)(?:\\n|$)",
910 if (is_esmtp && regex_match_and_setup(regex_AUTH, buffer, 0, -1))
912 uschar *names = string_copyn(expand_nstring[1], expand_nlength[1]);
913 expand_nmax = -1; /* reset */
915 /* Must not do this check until after we have saved the result of the
916 regex match above. */
918 if (require_auth == OK ||
919 verify_check_this_host(&(ob->hosts_try_auth), NULL, host->name,
920 host->address, NULL) == OK)
923 fail_reason = US"no common mechanisms were found";
925 DEBUG(D_transport) debug_printf("scanning authentication mechanisms\n");
927 /* Scan the configured authenticators looking for one which is configured
928 for use as a client, which is not suppressed by client_condition, and
929 whose name matches an authentication mechanism supported by the server.
930 If one is found, attempt to authenticate by calling its client function.
933 for (au = auths; !smtp_authenticated && au != NULL; au = au->next)
937 (au->client_condition != NULL &&
938 !expand_check_condition(au->client_condition, au->name,
939 US"client authenticator")))
941 DEBUG(D_transport) debug_printf("skipping %s authenticator: %s\n",
943 (au->client)? "client_condition is false" :
944 "not configured as a client");
948 /* Loop to scan supported server mechanisms */
953 int len = Ustrlen(au->public_name);
954 while (isspace(*p)) p++;
956 if (strncmpic(au->public_name, p, len) != 0 ||
957 (p[len] != 0 && !isspace(p[len])))
959 while (*p != 0 && !isspace(*p)) p++;
963 /* Found data for a listed mechanism. Call its client entry. Set
964 a flag in the outblock so that data is overwritten after sending so
965 that reflections don't show it. */
967 fail_reason = US"authentication attempt(s) failed";
968 obp->authenticating = TRUE;
969 rc = (au->info->clientcode)(au, ibp, obp,
970 ob->command_timeout, buffer, bufsize);
971 obp->authenticating = FALSE;
972 DEBUG(D_transport) debug_printf("%s authenticator yielded %d\n",
975 /* A temporary authentication failure must hold up delivery to
976 this host. After a permanent authentication failure, we carry on
977 to try other authentication methods. If all fail hard, try to
978 deliver the message unauthenticated unless require_auth was set. */
983 smtp_authenticated = TRUE; /* stops the outer loop */
984 client_authenticator = au->name;
985 if (au->set_client_id != NULL)
986 client_authenticated_id = expand_string(au->set_client_id);
989 /* Failure after writing a command */
994 /* Failure after reading a response */
997 if (errno != 0 || buffer[0] != '5') return FAIL;
998 log_write(0, LOG_MAIN, "%s authenticator failed H=%s [%s] %s",
999 au->name, host->name, host->address, buffer);
1002 /* Failure by some other means. In effect, the authenticator
1003 decided it wasn't prepared to handle this case. Typically this
1004 is the result of "fail" in an expansion string. Do we need to
1005 log anything here? Feb 2006: a message is now put in the buffer
1006 if logging is required. */
1010 log_write(0, LOG_MAIN, "%s authenticator cancelled "
1011 "authentication H=%s [%s] %s", au->name, host->name,
1012 host->address, buffer);
1015 /* Internal problem, message in buffer. */
1018 set_errno(addrlist, 0, string_copy(buffer), DEFER, FALSE);
1022 break; /* If not authenticated, try next authenticator */
1023 } /* Loop for scanning supported server mechanisms */
1024 } /* Loop for further authenticators */
1028 /* If we haven't authenticated, but are required to, give up. */
1030 if (require_auth == OK && !smtp_authenticated)
1032 set_errno(addrlist, ERRNO_AUTHFAIL,
1033 string_sprintf("authentication required but %s", fail_reason), DEFER,
1042 /* Construct AUTH appendix string for MAIL TO */
1045 buffer to build string
1046 addrlist chain of potential addresses to deliver
1047 ob transport options
1049 Globals smtp_authenticated
1050 client_authenticated_sender
1051 Return True on error, otherwise buffer has (possibly empty) terminated string
1055 smtp_mail_auth_str(uschar *buffer, unsigned bufsize, address_item *addrlist,
1056 smtp_transport_options_block *ob)
1058 uschar *local_authenticated_sender = authenticated_sender;
1061 debug_printf("smtp_mail_auth_str: as<%s> os<%s> SA<%s>\n", authenticated_sender, ob->authenticated_sender, smtp_authenticated?"Y":"N");
1064 if (ob->authenticated_sender != NULL)
1066 uschar *new = expand_string(ob->authenticated_sender);
1069 if (!expand_string_forcedfail)
1071 uschar *message = string_sprintf("failed to expand "
1072 "authenticated_sender: %s", expand_string_message);
1073 set_errno(addrlist, 0, message, DEFER, FALSE);
1077 else if (new[0] != 0) local_authenticated_sender = new;
1080 /* Add the authenticated sender address if present */
1082 if ((smtp_authenticated || ob->authenticated_sender_force) &&
1083 local_authenticated_sender != NULL)
1085 string_format(buffer, bufsize, " AUTH=%s",
1086 auth_xtextencode(local_authenticated_sender,
1087 Ustrlen(local_authenticated_sender)));
1088 client_authenticated_sender = string_copy(local_authenticated_sender);
1098 /*************************************************
1099 * Deliver address list to given host *
1100 *************************************************/
1102 /* If continue_hostname is not null, we get here only when continuing to
1103 deliver down an existing channel. The channel was passed as the standard
1104 input. TLS is never active on a passed channel; the previous process always
1105 closes it down before passing the connection on.
1107 Otherwise, we have to make a connection to the remote host, and do the
1108 initial protocol exchange.
1110 When running as an MUA wrapper, if the sender or any recipient is rejected,
1111 temporarily or permanently, we force failure for all recipients.
1114 addrlist chain of potential addresses to deliver; only those whose
1115 transport_return field is set to PENDING_DEFER are currently
1116 being processed; others should be skipped - they have either
1117 been delivered to an earlier host or IP address, or been
1118 failed by one of them.
1119 host host to deliver to
1120 host_af AF_INET or AF_INET6
1121 port default TCP/IP port to use, in host byte order
1122 interface interface to bind to, or NULL
1123 tblock transport instance block
1124 copy_host TRUE if host set in addr->host_used must be copied, because
1125 it is specific to this call of the transport
1126 message_defer set TRUE if yield is OK, but all addresses were deferred
1127 because of a non-recipient, non-host failure, that is, a
1128 4xx response to MAIL FROM, DATA, or ".". This is a defer
1129 that is specific to the message.
1130 suppress_tls if TRUE, don't attempt a TLS connection - this is set for
1131 a second attempt after TLS initialization fails
1133 Returns: OK - the connection was made and the delivery attempted;
1134 the result for each address is in its data block.
1135 DEFER - the connection could not be made, or something failed
1136 while setting up the SMTP session, or there was a
1137 non-message-specific error, such as a timeout.
1138 ERROR - a filter command is specified for this transport,
1139 and there was a problem setting it up; OR helo_data
1140 or add_headers or authenticated_sender is specified
1141 for this transport, and the string failed to expand
1145 smtp_deliver(address_item *addrlist, host_item *host, int host_af, int port,
1146 uschar *interface, transport_instance *tblock, BOOL copy_host,
1147 BOOL *message_defer, BOOL suppress_tls)
1150 address_item *sync_addr;
1151 address_item *first_addr = addrlist;
1156 time_t start_delivery_time = time(NULL);
1157 smtp_transport_options_block *ob =
1158 (smtp_transport_options_block *)(tblock->options_block);
1159 BOOL lmtp = strcmpic(ob->protocol, US"lmtp") == 0;
1160 BOOL smtps = strcmpic(ob->protocol, US"smtps") == 0;
1162 BOOL send_rset = TRUE;
1163 BOOL send_quit = TRUE;
1164 BOOL setting_up = TRUE;
1165 BOOL completed_address = FALSE;
1168 BOOL pass_message = FALSE;
1169 #ifdef EXPERIMENTAL_PRDR
1170 BOOL prdr_offered = FALSE;
1173 smtp_inblock inblock;
1174 smtp_outblock outblock;
1175 int max_rcpt = tblock->max_addresses;
1176 uschar *igquotstr = US"";
1177 uschar *helo_data = NULL;
1178 uschar *message = NULL;
1179 uschar new_message_id[MESSAGE_ID_LENGTH + 1];
1181 uschar buffer[4096];
1182 uschar inbuffer[4096];
1183 uschar outbuffer[1024];
1185 suppress_tls = suppress_tls; /* stop compiler warning when no TLS support */
1187 *message_defer = FALSE;
1188 smtp_command = US"initial connection";
1189 if (max_rcpt == 0) max_rcpt = 999999;
1191 /* Set up the buffer for reading SMTP response packets. */
1193 inblock.buffer = inbuffer;
1194 inblock.buffersize = sizeof(inbuffer);
1195 inblock.ptr = inbuffer;
1196 inblock.ptrend = inbuffer;
1198 /* Set up the buffer for holding SMTP commands while pipelining */
1200 outblock.buffer = outbuffer;
1201 outblock.buffersize = sizeof(outbuffer);
1202 outblock.ptr = outbuffer;
1203 outblock.cmd_count = 0;
1204 outblock.authenticating = FALSE;
1206 /* Reset the parameters of a TLS session. */
1209 tls_in.cipher = NULL; /* for back-compatible behaviour */
1210 tls_in.peerdn = NULL;
1211 #if defined(SUPPORT_TLS) && !defined(USE_GNUTLS)
1216 tls_out.cipher = NULL; /* the one we may use for this transport */
1217 tls_out.peerdn = NULL;
1218 #if defined(SUPPORT_TLS) && !defined(USE_GNUTLS)
1225 set_errno(addrlist, 0, US"TLS support not available", DEFER, FALSE);
1230 /* Make a connection to the host if this isn't a continued delivery, and handle
1231 the initial interaction and HELO/EHLO/LHLO. Connect timeout errors are handled
1232 specially so they can be identified for retries. */
1234 if (continue_hostname == NULL)
1236 inblock.sock = outblock.sock =
1237 smtp_connect(host, host_af, port, interface, ob->connect_timeout,
1238 ob->keepalive, ob->dscp); /* This puts port into host->port */
1240 if (inblock.sock < 0)
1242 set_errno(addrlist, (errno == ETIMEDOUT)? ERRNO_CONNECTTIMEOUT : errno,
1243 NULL, DEFER, FALSE);
1247 /* Expand the greeting message while waiting for the initial response. (Makes
1248 sense if helo_data contains ${lookup dnsdb ...} stuff). The expansion is
1249 delayed till here so that $sending_interface and $sending_port are set. */
1251 helo_data = expand_string(ob->helo_data);
1253 /* The first thing is to wait for an initial OK response. The dreaded "goto"
1254 is nevertheless a reasonably clean way of programming this kind of logic,
1255 where you want to escape on any error. */
1259 if (!smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
1260 ob->command_timeout)) goto RESPONSE_FAILED;
1262 /* Now check if the helo_data expansion went well, and sign off cleanly if
1265 if (helo_data == NULL)
1267 uschar *message = string_sprintf("failed to expand helo_data: %s",
1268 expand_string_message);
1269 set_errno(addrlist, 0, message, DEFER, FALSE);
1275 /** Debugging without sending a message
1276 addrlist->transport_return = DEFER;
1280 /* Errors that occur after this point follow an SMTP command, which is
1281 left in big_buffer by smtp_write_command() for use in error messages. */
1283 smtp_command = big_buffer;
1285 /* Tell the remote who we are...
1287 February 1998: A convention has evolved that ESMTP-speaking MTAs include the
1288 string "ESMTP" in their greeting lines, so make Exim send EHLO if the
1289 greeting is of this form. The assumption was that the far end supports it
1290 properly... but experience shows that there are some that give 5xx responses,
1291 even though the banner includes "ESMTP" (there's a bloody-minded one that
1292 says "ESMTP not spoken here"). Cope with that case.
1294 September 2000: Time has passed, and it seems reasonable now to always send
1295 EHLO at the start. It is also convenient to make the change while installing
1298 July 2003: Joachim Wieland met a broken server that advertises "PIPELINING"
1299 but times out after sending MAIL FROM, RCPT TO and DATA all together. There
1300 would be no way to send out the mails, so there is now a host list
1301 "hosts_avoid_esmtp" that disables ESMTP for special hosts and solves the
1302 PIPELINING problem as well. Maybe it can also be useful to cure other
1303 problems with broken servers.
1305 Exim originally sent "Helo" at this point and ran for nearly a year that way.
1306 Then somebody tried it with a Microsoft mailer... It seems that all other
1307 mailers use upper case for some reason (the RFC is quite clear about case
1308 independence) so, for peace of mind, I gave in. */
1310 esmtp = verify_check_this_host(&(ob->hosts_avoid_esmtp), NULL,
1311 host->name, host->address, NULL) != OK;
1313 /* Alas; be careful, since this goto is not an error-out, so conceivably
1314 we might set data between here and the target which we assume to exist
1315 and be usable. I can see this coming back to bite us. */
1320 suppress_tls = FALSE;
1321 ob->tls_tempfail_tryclear = FALSE;
1322 smtp_command = US"SSL-on-connect";
1329 if (smtp_write_command(&outblock, FALSE, "%s %s\r\n",
1330 lmtp? "LHLO" : "EHLO", helo_data) < 0)
1332 if (!smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
1333 ob->command_timeout))
1335 if (errno != 0 || buffer[0] == 0 || lmtp) goto RESPONSE_FAILED;
1342 debug_printf("not sending EHLO (host matches hosts_avoid_esmtp)\n");
1347 if (smtp_write_command(&outblock, FALSE, "HELO %s\r\n", helo_data) < 0)
1349 if (!smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
1350 ob->command_timeout)) goto RESPONSE_FAILED;
1353 /* Set IGNOREQUOTA if the response to LHLO specifies support and the
1354 lmtp_ignore_quota option was set. */
1356 igquotstr = (lmtp && ob->lmtp_ignore_quota &&
1357 pcre_exec(regex_IGNOREQUOTA, NULL, CS buffer, Ustrlen(CS buffer), 0,
1358 PCRE_EOPT, NULL, 0) >= 0)? US" IGNOREQUOTA" : US"";
1360 /* Set tls_offered if the response to EHLO specifies support for STARTTLS. */
1363 tls_offered = esmtp &&
1364 pcre_exec(regex_STARTTLS, NULL, CS buffer, Ustrlen(buffer), 0,
1365 PCRE_EOPT, NULL, 0) >= 0;
1368 #ifdef EXPERIMENTAL_PRDR
1369 prdr_offered = esmtp &&
1370 (pcre_exec(regex_PRDR, NULL, CS buffer, Ustrlen(buffer), 0,
1371 PCRE_EOPT, NULL, 0) >= 0) &&
1372 (verify_check_this_host(&(ob->hosts_try_prdr), NULL, host->name,
1373 host->address, NULL) == OK);
1376 {DEBUG(D_transport) debug_printf("PRDR usable\n");}
1380 /* For continuing deliveries down the same channel, the socket is the standard
1381 input, and we don't need to redo EHLO here (but may need to do so for TLS - see
1382 below). Set up the pointer to where subsequent commands will be left, for
1383 error messages. Note that smtp_use_size and smtp_use_pipelining will have been
1384 set from the command line if they were set in the process that passed the
1389 inblock.sock = outblock.sock = fileno(stdin);
1390 smtp_command = big_buffer;
1391 host->port = port; /* Record the port that was used */
1394 /* If TLS is available on this connection, whether continued or not, attempt to
1395 start up a TLS session, unless the host is in hosts_avoid_tls. If successful,
1396 send another EHLO - the server may give a different answer in secure mode. We
1397 use a separate buffer for reading the response to STARTTLS so that if it is
1398 negative, the original EHLO data is available for subsequent analysis, should
1399 the client not be required to use TLS. If the response is bad, copy the buffer
1400 for error analysis. */
1403 if (tls_offered && !suppress_tls &&
1404 verify_check_this_host(&(ob->hosts_avoid_tls), NULL, host->name,
1405 host->address, NULL) != OK)
1407 uschar buffer2[4096];
1408 if (smtp_write_command(&outblock, FALSE, "STARTTLS\r\n") < 0)
1411 /* If there is an I/O error, transmission of this message is deferred. If
1412 there is a temporary rejection of STARRTLS and tls_tempfail_tryclear is
1413 false, we also defer. However, if there is a temporary rejection of STARTTLS
1414 and tls_tempfail_tryclear is true, or if there is an outright rejection of
1415 STARTTLS, we carry on. This means we will try to send the message in clear,
1416 unless the host is in hosts_require_tls (tested below). */
1418 if (!smtp_read_response(&inblock, buffer2, sizeof(buffer2), '2',
1419 ob->command_timeout))
1421 if (errno != 0 || buffer2[0] == 0 ||
1422 (buffer2[0] == '4' && !ob->tls_tempfail_tryclear))
1424 Ustrncpy(buffer, buffer2, sizeof(buffer));
1425 goto RESPONSE_FAILED;
1429 /* STARTTLS accepted: try to negotiate a TLS session. */
1434 int rc = tls_client_start(inblock.sock,
1437 ob->tls_certificate,
1440 ob->tls_verify_certificates,
1442 ob->tls_require_ciphers,
1443 #ifdef EXPERIMENTAL_OCSP
1444 ob->hosts_require_ocsp,
1446 ob->tls_dh_min_bits,
1447 ob->command_timeout);
1449 /* TLS negotiation failed; give an error. From outside, this function may
1450 be called again to try in clear on a new connection, if the options permit
1451 it for this host. */
1455 save_errno = ERRNO_TLSFAILURE;
1456 message = US"failure while setting up TLS session";
1461 /* TLS session is set up */
1463 for (addr = addrlist; addr != NULL; addr = addr->next)
1465 if (addr->transport_return == PENDING_DEFER)
1467 addr->cipher = tls_out.cipher;
1468 addr->peerdn = tls_out.peerdn;
1474 /* if smtps, we'll have smtp_command set to something else; always safe to
1476 smtp_command = big_buffer;
1478 /* If we started TLS, redo the EHLO/LHLO exchange over the secure channel. If
1479 helo_data is null, we are dealing with a connection that was passed from
1480 another process, and so we won't have expanded helo_data above. We have to
1481 expand it here. $sending_ip_address and $sending_port are set up right at the
1482 start of the Exim process (in exim.c). */
1484 if (tls_out.active >= 0)
1487 if (helo_data == NULL)
1489 helo_data = expand_string(ob->helo_data);
1490 if (helo_data == NULL)
1492 uschar *message = string_sprintf("failed to expand helo_data: %s",
1493 expand_string_message);
1494 set_errno(addrlist, 0, message, DEFER, FALSE);
1500 /* For SMTPS we need to wait for the initial OK response. */
1503 if (!smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
1504 ob->command_timeout)) goto RESPONSE_FAILED;
1508 greeting_cmd = "EHLO";
1511 greeting_cmd = "HELO";
1513 debug_printf("not sending EHLO (host matches hosts_avoid_esmtp)\n");
1516 if (smtp_write_command(&outblock, FALSE, "%s %s\r\n",
1517 lmtp? "LHLO" : greeting_cmd, helo_data) < 0)
1519 if (!smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
1520 ob->command_timeout))
1521 goto RESPONSE_FAILED;
1524 /* If the host is required to use a secure channel, ensure that we
1527 else if (verify_check_this_host(&(ob->hosts_require_tls), NULL, host->name,
1528 host->address, NULL) == OK)
1530 save_errno = ERRNO_TLSREQUIRED;
1531 message = string_sprintf("a TLS session is required for %s [%s], but %s",
1532 host->name, host->address,
1533 tls_offered? "an attempt to start TLS failed" :
1534 "the server did not offer TLS support");
1539 /* If TLS is active, we have just started it up and re-done the EHLO command,
1540 so its response needs to be analyzed. If TLS is not active and this is a
1541 continued session down a previously-used socket, we haven't just done EHLO, so
1544 if (continue_hostname == NULL
1546 || tls_out.active >= 0
1550 /* Set for IGNOREQUOTA if the response to LHLO specifies support and the
1551 lmtp_ignore_quota option was set. */
1553 igquotstr = (lmtp && ob->lmtp_ignore_quota &&
1554 pcre_exec(regex_IGNOREQUOTA, NULL, CS buffer, Ustrlen(CS buffer), 0,
1555 PCRE_EOPT, NULL, 0) >= 0)? US" IGNOREQUOTA" : US"";
1557 /* If the response to EHLO specified support for the SIZE parameter, note
1558 this, provided size_addition is non-negative. */
1560 smtp_use_size = esmtp && ob->size_addition >= 0 &&
1561 pcre_exec(regex_SIZE, NULL, CS buffer, Ustrlen(CS buffer), 0,
1562 PCRE_EOPT, NULL, 0) >= 0;
1564 /* Note whether the server supports PIPELINING. If hosts_avoid_esmtp matched
1565 the current host, esmtp will be false, so PIPELINING can never be used. If
1566 the current host matches hosts_avoid_pipelining, don't do it. */
1568 smtp_use_pipelining = esmtp &&
1569 verify_check_this_host(&(ob->hosts_avoid_pipelining), NULL, host->name,
1570 host->address, NULL) != OK &&
1571 pcre_exec(regex_PIPELINING, NULL, CS buffer, Ustrlen(CS buffer), 0,
1572 PCRE_EOPT, NULL, 0) >= 0;
1574 DEBUG(D_transport) debug_printf("%susing PIPELINING\n",
1575 smtp_use_pipelining? "" : "not ");
1577 #ifdef EXPERIMENTAL_PRDR
1578 prdr_offered = esmtp &&
1579 pcre_exec(regex_PRDR, NULL, CS buffer, Ustrlen(CS buffer), 0,
1580 PCRE_EOPT, NULL, 0) >= 0 &&
1581 verify_check_this_host(&(ob->hosts_try_prdr), NULL, host->name,
1582 host->address, NULL) == OK;
1585 {DEBUG(D_transport) debug_printf("PRDR usable\n");}
1588 /* Note if the response to EHLO specifies support for the AUTH extension.
1589 If it has, check that this host is one we want to authenticate to, and do
1590 the business. The host name and address must be available when the
1591 authenticator's client driver is running. */
1593 switch (yield = smtp_auth(buffer, sizeof(buffer), addrlist, host,
1594 ob, esmtp, &inblock, &outblock))
1596 default: goto SEND_QUIT;
1598 case FAIL_SEND: goto SEND_FAILED;
1599 case FAIL: goto RESPONSE_FAILED;
1603 /* The setting up of the SMTP call is now complete. Any subsequent errors are
1604 message-specific. */
1608 /* If there is a filter command specified for this transport, we can now
1609 set it up. This cannot be done until the identify of the host is known. */
1611 if (tblock->filter_command != NULL)
1615 sprintf(CS buffer, "%.50s transport", tblock->name);
1616 rc = transport_set_up_command(&transport_filter_argv, tblock->filter_command,
1617 TRUE, DEFER, addrlist, buffer, NULL);
1618 transport_filter_timeout = tblock->filter_timeout;
1620 /* On failure, copy the error to all addresses, abandon the SMTP call, and
1625 set_errno(addrlist->next, addrlist->basic_errno, addrlist->message, DEFER,
1633 /* For messages that have more than the maximum number of envelope recipients,
1634 we want to send several transactions down the same SMTP connection. (See
1635 comments in deliver.c as to how this reconciles, heuristically, with
1636 remote_max_parallel.) This optimization was added to Exim after the following
1637 code was already working. The simplest way to put it in without disturbing the
1638 code was to use a goto to jump back to this point when there is another
1639 transaction to handle. */
1642 sync_addr = first_addr;
1646 completed_address = FALSE;
1649 /* Initiate a message transfer. If we know the receiving MTA supports the SIZE
1650 qualification, send it, adding something to the message size to allow for
1651 imprecision and things that get added en route. Exim keeps the number of lines
1652 in a message, so we can give an accurate value for the original message, but we
1653 need some additional to handle added headers. (Double "." characters don't get
1654 included in the count.) */
1661 sprintf(CS p, " SIZE=%d", message_size+message_linecount+ob->size_addition);
1665 #ifdef EXPERIMENTAL_PRDR
1666 prdr_active = FALSE;
1669 for (addr = first_addr; addr; addr = addr->next)
1670 if (addr->transport_return == PENDING_DEFER)
1672 for (addr = addr->next; addr; addr = addr->next)
1673 if (addr->transport_return == PENDING_DEFER)
1674 { /* at least two recipients to send */
1676 sprintf(CS p, " PRDR"); p += 5;
1677 goto prdr_is_active;
1685 /* If an authenticated_sender override has been specified for this transport
1686 instance, expand it. If the expansion is forced to fail, and there was already
1687 an authenticated_sender for this message, the original value will be used.
1688 Other expansion failures are serious. An empty result is ignored, but there is
1689 otherwise no check - this feature is expected to be used with LMTP and other
1690 cases where non-standard addresses (e.g. without domains) might be required. */
1692 if (smtp_mail_auth_str(p, sizeof(buffer) - (p-buffer), addrlist, ob))
1695 /* From here until we send the DATA command, we can make use of PIPELINING
1696 if the server host supports it. The code has to be able to check the responses
1697 at any point, for when the buffer fills up, so we write it totally generally.
1698 When PIPELINING is off, each command written reports that it has flushed the
1701 pending_MAIL = TRUE; /* The block starts with MAIL */
1703 rc = smtp_write_command(&outblock, smtp_use_pipelining,
1704 "MAIL FROM:<%s>%s\r\n", return_path, buffer);
1705 mail_command = string_copy(big_buffer); /* Save for later error message */
1709 case -1: /* Transmission error */
1712 case +1: /* Block was sent */
1713 if (!smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
1714 ob->command_timeout))
1716 if (errno == 0 && buffer[0] == '4')
1718 errno = ERRNO_MAIL4XX;
1719 addrlist->more_errno |= ((buffer[1] - '0')*10 + buffer[2] - '0') << 8;
1721 goto RESPONSE_FAILED;
1723 pending_MAIL = FALSE;
1727 /* Pass over all the relevant recipient addresses for this host, which are the
1728 ones that have status PENDING_DEFER. If we are using PIPELINING, we can send
1729 several before we have to read the responses for those seen so far. This
1730 checking is done by a subroutine because it also needs to be done at the end.
1731 Send only up to max_rcpt addresses at a time, leaving first_addr pointing to
1732 the next one if not all are sent.
1734 In the MUA wrapper situation, we want to flush the PIPELINING buffer for the
1735 last address because we want to abort if any recipients have any kind of
1736 problem, temporary or permanent. We know that all recipient addresses will have
1737 the PENDING_DEFER status, because only one attempt is ever made, and we know
1738 that max_rcpt will be large, so all addresses will be done at once. */
1740 for (addr = first_addr;
1741 address_count < max_rcpt && addr != NULL;
1747 if (addr->transport_return != PENDING_DEFER) continue;
1750 no_flush = smtp_use_pipelining && (!mua_wrapper || addr->next != NULL);
1752 /* Now send the RCPT command, and process outstanding responses when
1753 necessary. After a timeout on RCPT, we just end the function, leaving the
1754 yield as OK, because this error can often mean that there is a problem with
1755 just one address, so we don't want to delay the host. */
1757 count = smtp_write_command(&outblock, no_flush, "RCPT TO:<%s>%s\r\n",
1758 transport_rcpt_address(addr, tblock->rcpt_include_affixes), igquotstr);
1759 if (count < 0) goto SEND_FAILED;
1762 switch(sync_responses(first_addr, tblock->rcpt_include_affixes,
1763 &sync_addr, host, count, ob->address_retry_include_sender,
1764 pending_MAIL, 0, &inblock, ob->command_timeout, buffer,
1767 case 3: ok = TRUE; /* 2xx & 5xx => OK & progress made */
1768 case 2: completed_address = TRUE; /* 5xx (only) => progress made */
1771 case 1: ok = TRUE; /* 2xx (only) => OK, but if LMTP, */
1772 if (!lmtp) completed_address = TRUE; /* can't tell about progress yet */
1773 case 0: /* No 2xx or 5xx, but no probs */
1776 case -1: goto END_OFF; /* Timeout on RCPT */
1777 default: goto RESPONSE_FAILED; /* I/O error, or any MAIL error */
1779 pending_MAIL = FALSE; /* Dealt with MAIL */
1781 } /* Loop for next address */
1783 /* If we are an MUA wrapper, abort if any RCPTs were rejected, either
1784 permanently or temporarily. We should have flushed and synced after the last
1789 address_item *badaddr;
1790 for (badaddr = first_addr; badaddr != NULL; badaddr = badaddr->next)
1792 if (badaddr->transport_return != PENDING_OK) break;
1794 if (badaddr != NULL)
1796 set_errno(addrlist, 0, badaddr->message, FAIL,
1797 testflag(badaddr, af_pass_message));
1802 /* If ok is TRUE, we know we have got at least one good recipient, and must now
1803 send DATA, but if it is FALSE (in the normal, non-wrapper case), we may still
1804 have a good recipient buffered up if we are pipelining. We don't want to waste
1805 time sending DATA needlessly, so we only send it if either ok is TRUE or if we
1806 are pipelining. The responses are all handled by sync_responses(). */
1808 if (ok || (smtp_use_pipelining && !mua_wrapper))
1810 int count = smtp_write_command(&outblock, FALSE, "DATA\r\n");
1811 if (count < 0) goto SEND_FAILED;
1812 switch(sync_responses(first_addr, tblock->rcpt_include_affixes, &sync_addr,
1813 host, count, ob->address_retry_include_sender, pending_MAIL,
1814 ok? +1 : -1, &inblock, ob->command_timeout, buffer, sizeof(buffer)))
1816 case 3: ok = TRUE; /* 2xx & 5xx => OK & progress made */
1817 case 2: completed_address = TRUE; /* 5xx (only) => progress made */
1820 case 1: ok = TRUE; /* 2xx (only) => OK, but if LMTP, */
1821 if (!lmtp) completed_address = TRUE; /* can't tell about progress yet */
1822 case 0: break; /* No 2xx or 5xx, but no probs */
1824 case -1: goto END_OFF; /* Timeout on RCPT */
1825 default: goto RESPONSE_FAILED; /* I/O error, or any MAIL/DATA error */
1829 /* Save the first address of the next batch. */
1833 /* If there were no good recipients (but otherwise there have been no
1834 problems), just set ok TRUE, since we have handled address-specific errors
1835 already. Otherwise, it's OK to send the message. Use the check/escape mechanism
1836 for handling the SMTP dot-handling protocol, flagging to apply to headers as
1837 well as body. Set the appropriate timeout value to be used for each chunk.
1838 (Haven't been able to make it work using select() for writing yet.) */
1840 if (!ok) ok = TRUE; else
1842 sigalrm_seen = FALSE;
1843 transport_write_timeout = ob->data_timeout;
1844 smtp_command = US"sending data block"; /* For error messages */
1845 DEBUG(D_transport|D_v)
1846 debug_printf(" SMTP>> writing message and terminating \".\"\n");
1847 transport_count = 0;
1848 #ifndef DISABLE_DKIM
1849 ok = dkim_transport_write_message(addrlist, inblock.sock,
1850 topt_use_crlf | topt_end_dot | topt_escape_headers |
1851 (tblock->body_only? topt_no_headers : 0) |
1852 (tblock->headers_only? topt_no_body : 0) |
1853 (tblock->return_path_add? topt_add_return_path : 0) |
1854 (tblock->delivery_date_add? topt_add_delivery_date : 0) |
1855 (tblock->envelope_to_add? topt_add_envelope_to : 0),
1856 0, /* No size limit */
1857 tblock->add_headers, tblock->remove_headers,
1858 US".", US"..", /* Escaping strings */
1859 tblock->rewrite_rules, tblock->rewrite_existflags,
1860 ob->dkim_private_key, ob->dkim_domain, ob->dkim_selector,
1861 ob->dkim_canon, ob->dkim_strict, ob->dkim_sign_headers
1864 ok = transport_write_message(addrlist, inblock.sock,
1865 topt_use_crlf | topt_end_dot | topt_escape_headers |
1866 (tblock->body_only? topt_no_headers : 0) |
1867 (tblock->headers_only? topt_no_body : 0) |
1868 (tblock->return_path_add? topt_add_return_path : 0) |
1869 (tblock->delivery_date_add? topt_add_delivery_date : 0) |
1870 (tblock->envelope_to_add? topt_add_envelope_to : 0),
1871 0, /* No size limit */
1872 tblock->add_headers, tblock->remove_headers,
1873 US".", US"..", /* Escaping strings */
1874 tblock->rewrite_rules, tblock->rewrite_existflags);
1877 /* transport_write_message() uses write() because it is called from other
1878 places to write to non-sockets. This means that under some OS (e.g. Solaris)
1879 it can exit with "Broken pipe" as its error. This really means that the
1880 socket got closed at the far end. */
1882 transport_write_timeout = 0; /* for subsequent transports */
1884 /* Failure can either be some kind of I/O disaster (including timeout),
1885 or the failure of a transport filter or the expansion of added headers. */
1889 buffer[0] = 0; /* There hasn't been a response */
1890 goto RESPONSE_FAILED;
1893 /* We used to send the terminating "." explicitly here, but because of
1894 buffering effects at both ends of TCP/IP connections, you don't gain
1895 anything by keeping it separate, so it might as well go in the final
1896 data buffer for efficiency. This is now done by setting the topt_end_dot
1899 smtp_command = US"end of data";
1901 #ifdef EXPERIMENTAL_PRDR
1902 /* For PRDR we optionally get a partial-responses warning
1903 * followed by the individual responses, before going on with
1904 * the overall response. If we don't get the warning then deal
1905 * with per non-PRDR. */
1908 ok = smtp_read_response(&inblock, buffer, sizeof(buffer), '3',
1910 if (!ok && errno == 0)
1913 case '2': prdr_active = FALSE;
1916 case '4': errno = ERRNO_DATA4XX;
1917 addrlist->more_errno |= ((buffer[1] - '0')*10 + buffer[2] - '0') << 8;
1924 /* For non-PRDR SMTP, we now read a single response that applies to the
1925 whole message. If it is OK, then all the addresses have been delivered. */
1929 ok = smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
1931 if (!ok && errno == 0 && buffer[0] == '4')
1933 errno = ERRNO_DATA4XX;
1934 addrlist->more_errno |= ((buffer[1] - '0')*10 + buffer[2] - '0') << 8;
1938 /* For LMTP, we get back a response for every RCPT command that we sent;
1939 some may be accepted and some rejected. For those that get a response, their
1940 status is fixed; any that are accepted have been handed over, even if later
1941 responses crash - at least, that's how I read RFC 2033.
1943 If all went well, mark the recipient addresses as completed, record which
1944 host/IPaddress they were delivered to, and cut out RSET when sending another
1945 message down the same channel. Write the completed addresses to the journal
1946 now so that they are recorded in case there is a crash of hardware or
1947 software before the spool gets updated. Also record the final SMTP
1948 confirmation if needed (for SMTP only). */
1953 int delivery_time = (int)(time(NULL) - start_delivery_time);
1956 uschar *conf = NULL;
1959 /* Make a copy of the host if it is local to this invocation
1960 of the transport. */
1964 thost = store_get(sizeof(host_item));
1966 thost->name = string_copy(host->name);
1967 thost->address = string_copy(host->address);
1971 /* Set up confirmation if needed - applies only to SMTP */
1974 #ifndef EXPERIMENTAL_TPDA
1975 (log_extra_selector & LX_smtp_confirmation) != 0 &&
1980 uschar *s = string_printing(buffer);
1981 conf = (s == buffer)? (uschar *)string_copy(s) : s;
1984 /* Process all transported addresses - for LMTP or PRDR, read a status for
1987 for (addr = addrlist; addr != first_addr; addr = addr->next)
1989 if (addr->transport_return != PENDING_OK) continue;
1991 /* LMTP - if the response fails badly (e.g. timeout), use it for all the
1992 remaining addresses. Otherwise, it's a return code for just the one
1993 address. For temporary errors, add a retry item for the address so that
1994 it doesn't get tried again too soon. */
1996 #ifdef EXPERIMENTAL_PRDR
1997 if (lmtp || prdr_active)
2002 if (!smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
2005 if (errno != 0 || buffer[0] == 0) goto RESPONSE_FAILED;
2006 addr->message = string_sprintf(
2007 #ifdef EXPERIMENTAL_PRDR
2008 "%s error after %s: %s", prdr_active ? "PRDR":"LMTP",
2010 "LMTP error after %s: %s",
2012 big_buffer, string_printing(buffer));
2013 setflag(addr, af_pass_message); /* Allow message to go to user */
2014 if (buffer[0] == '5')
2015 addr->transport_return = FAIL;
2018 errno = ERRNO_DATA4XX;
2019 addr->more_errno |= ((buffer[1] - '0')*10 + buffer[2] - '0') << 8;
2020 addr->transport_return = DEFER;
2021 #ifdef EXPERIMENTAL_PRDR
2024 retry_add_item(addr, addr->address_retry_key, 0);
2028 completed_address = TRUE; /* NOW we can set this flag */
2029 if ((log_extra_selector & LX_smtp_confirmation) != 0)
2031 uschar *s = string_printing(buffer);
2032 conf = (s == buffer)? (uschar *)string_copy(s) : s;
2036 /* SMTP, or success return from LMTP for this address. Pass back the
2037 actual host that was used. */
2039 addr->transport_return = OK;
2040 addr->more_errno = delivery_time;
2041 addr->host_used = thost;
2042 addr->special_action = flag;
2043 addr->message = conf;
2044 #ifdef EXPERIMENTAL_PRDR
2045 if (prdr_active) addr->flags |= af_prdr_used;
2049 #ifdef EXPERIMENTAL_PRDR
2053 /* Update the journal. For homonymic addresses, use the base address plus
2054 the transport name. See lots of comments in deliver.c about the reasons
2055 for the complications when homonyms are involved. Just carry on after
2056 write error, as it may prove possible to update the spool file later. */
2058 if (testflag(addr, af_homonym))
2059 sprintf(CS buffer, "%.500s/%s\n", addr->unique + 3, tblock->name);
2061 sprintf(CS buffer, "%.500s\n", addr->unique);
2063 DEBUG(D_deliver) debug_printf("journalling %s", buffer);
2064 len = Ustrlen(CS buffer);
2065 if (write(journal_fd, buffer, len) != len)
2066 log_write(0, LOG_MAIN|LOG_PANIC, "failed to write journal for "
2067 "%s: %s", buffer, strerror(errno));
2071 #ifdef EXPERIMENTAL_PRDR
2074 /* PRDR - get the final, overall response. For any non-success
2075 upgrade all the address statuses. */
2076 ok = smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
2080 if(errno == 0 && buffer[0] == '4')
2082 errno = ERRNO_DATA4XX;
2083 addrlist->more_errno |= ((buffer[1] - '0')*10 + buffer[2] - '0') << 8;
2085 for (addr = addrlist; addr != first_addr; addr = addr->next)
2086 if (buffer[0] == '5' || addr->transport_return == OK)
2087 addr->transport_return = PENDING_OK; /* allow set_errno action */
2088 goto RESPONSE_FAILED;
2091 /* Update the journal, or setup retry. */
2092 for (addr = addrlist; addr != first_addr; addr = addr->next)
2093 if (addr->transport_return == OK)
2095 if (testflag(addr, af_homonym))
2096 sprintf(CS buffer, "%.500s/%s\n", addr->unique + 3, tblock->name);
2098 sprintf(CS buffer, "%.500s\n", addr->unique);
2100 DEBUG(D_deliver) debug_printf("journalling(PRDR) %s", buffer);
2101 len = Ustrlen(CS buffer);
2102 if (write(journal_fd, buffer, len) != len)
2103 log_write(0, LOG_MAIN|LOG_PANIC, "failed to write journal for "
2104 "%s: %s", buffer, strerror(errno));
2106 else if (addr->transport_return == DEFER)
2107 retry_add_item(addr, addr->address_retry_key, -2);
2111 /* Ensure the journal file is pushed out to disk. */
2113 if (EXIMfsync(journal_fd) < 0)
2114 log_write(0, LOG_MAIN|LOG_PANIC, "failed to fsync journal: %s",
2120 /* Handle general (not specific to one address) failures here. The value of ok
2121 is used to skip over this code on the falling through case. A timeout causes a
2122 deferral. Other errors may defer or fail according to the response code, and
2123 may set up a special errno value, e.g. after connection chopped, which is
2124 assumed if errno == 0 and there is no text in the buffer. If control reaches
2125 here during the setting up phase (i.e. before MAIL FROM) then always defer, as
2126 the problem is not related to this specific message. */
2135 send_quit = check_response(host, &save_errno, addrlist->more_errno,
2136 buffer, &code, &message, &pass_message);
2142 message = US string_sprintf("send() to %s [%s] failed: %s",
2143 host->name, host->address, strerror(save_errno));
2147 /* This label is jumped to directly when a TLS negotiation has failed,
2148 or was not done for a host for which it is required. Values will be set
2149 in message and save_errno, and setting_up will always be true. Treat as
2150 a temporary error. */
2157 /* If the failure happened while setting up the call, see if the failure was
2158 a 5xx response (this will either be on connection, or following HELO - a 5xx
2159 after EHLO causes it to try HELO). If so, fail all addresses, as this host is
2160 never going to accept them. For other errors during setting up (timeouts or
2161 whatever), defer all addresses, and yield DEFER, so that the host is not
2162 tried again for a while. */
2165 ok = FALSE; /* For when reached by GOTO */
2171 set_errno(addrlist, save_errno, message, FAIL, pass_message);
2175 set_errno(addrlist, save_errno, message, DEFER, pass_message);
2180 /* We want to handle timeouts after MAIL or "." and loss of connection after
2181 "." specially. They can indicate a problem with the sender address or with
2182 the contents of the message rather than a real error on the connection. These
2183 cases are treated in the same way as a 4xx response. This next bit of code
2184 does the classification. */
2195 message_error = TRUE;
2199 message_error = Ustrncmp(smtp_command,"MAIL",4) == 0 ||
2200 Ustrncmp(smtp_command,"end ",4) == 0;
2203 case ERRNO_SMTPCLOSED:
2204 message_error = Ustrncmp(smtp_command,"end ",4) == 0;
2208 message_error = FALSE;
2212 /* Handle the cases that are treated as message errors. These are:
2214 (a) negative response or timeout after MAIL
2215 (b) negative response after DATA
2216 (c) negative response or timeout or dropped connection after "."
2218 It won't be a negative response or timeout after RCPT, as that is dealt
2219 with separately above. The action in all cases is to set an appropriate
2220 error code for all the addresses, but to leave yield set to OK because the
2221 host itself has not failed. Of course, it might in practice have failed
2222 when we've had a timeout, but if so, we'll discover that at the next
2223 delivery attempt. For a temporary error, set the message_defer flag, and
2224 write to the logs for information if this is not the last host. The error
2225 for the last host will be logged as part of the address's log line. */
2229 if (mua_wrapper) code = '5'; /* Force hard failure in wrapper mode */
2230 set_errno(addrlist, save_errno, message, (code == '5')? FAIL : DEFER,
2233 /* If there's an errno, the message contains just the identity of
2236 if (code != '5') /* Anything other than 5 is treated as temporary */
2239 message = US string_sprintf("%s: %s", message, strerror(save_errno));
2240 if (host->next != NULL) log_write(0, LOG_MAIN, "%s", message);
2241 deliver_msglog("%s %s\n", tod_stamp(tod_log), message);
2242 *message_defer = TRUE;
2246 /* Otherwise, we have an I/O error or a timeout other than after MAIL or
2247 ".", or some other transportation error. We defer all addresses and yield
2248 DEFER, except for the case of failed add_headers expansion, or a transport
2249 filter failure, when the yield should be ERROR, to stop it trying other
2254 yield = (save_errno == ERRNO_CHHEADER_FAIL ||
2255 save_errno == ERRNO_FILTER_FAIL)? ERROR : DEFER;
2256 set_errno(addrlist, save_errno, message, DEFER, pass_message);
2262 /* If all has gone well, send_quit will be set TRUE, implying we can end the
2263 SMTP session tidily. However, if there were too many addresses to send in one
2264 message (indicated by first_addr being non-NULL) we want to carry on with the
2265 rest of them. Also, it is desirable to send more than one message down the SMTP
2266 connection if there are several waiting, provided we haven't already sent so
2267 many as to hit the configured limit. The function transport_check_waiting looks
2268 for a waiting message and returns its id. Then transport_pass_socket tries to
2269 set up a continued delivery by passing the socket on to another process. The
2270 variable send_rset is FALSE if a message has just been successfully transfered.
2272 If we are already sending down a continued channel, there may be further
2273 addresses not yet delivered that are aimed at the same host, but which have not
2274 been passed in this run of the transport. In this case, continue_more will be
2275 true, and all we should do is send RSET if necessary, and return, leaving the
2278 However, if no address was disposed of, i.e. all addresses got 4xx errors, we
2279 do not want to continue with other messages down the same channel, because that
2280 can lead to looping between two or more messages, all with the same,
2281 temporarily failing address(es). [The retry information isn't updated yet, so
2282 new processes keep on trying.] We probably also don't want to try more of this
2283 message's addresses either.
2285 If we have started a TLS session, we have to end it before passing the
2286 connection to a new process. However, not all servers can handle this (Exim
2287 can), so we do not pass such a connection on if the host matches
2288 hosts_nopass_tls. */
2291 debug_printf("ok=%d send_quit=%d send_rset=%d continue_more=%d "
2292 "yield=%d first_address is %sNULL\n", ok, send_quit, send_rset,
2293 continue_more, yield, (first_addr == NULL)? "":"not ");
2295 if (completed_address && ok && send_quit)
2298 if (first_addr != NULL || continue_more ||
2300 (tls_out.active < 0 ||
2301 verify_check_this_host(&(ob->hosts_nopass_tls), NULL, host->name,
2302 host->address, NULL) != OK)
2304 transport_check_waiting(tblock->name, host->name,
2305 tblock->connection_max_messages, new_message_id, &more)
2313 if (! (ok = smtp_write_command(&outblock, FALSE, "RSET\r\n") >= 0))
2315 msg = US string_sprintf("send() to %s [%s] failed: %s", host->name,
2316 host->address, strerror(save_errno));
2319 else if (! (ok = smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
2320 ob->command_timeout)))
2323 send_quit = check_response(host, &errno, 0, buffer, &code, &msg,
2327 DEBUG(D_transport) debug_printf("%s\n", msg);
2332 /* Either RSET was not needed, or it succeeded */
2336 if (first_addr != NULL) /* More addresses still to be sent */
2337 { /* in this run of the transport */
2338 continue_sequence++; /* Causes * in logging */
2341 if (continue_more) return yield; /* More addresses for another run */
2343 /* Pass the socket to a new Exim process. Before doing so, we must shut
2344 down TLS. Not all MTAs allow for the continuation of the SMTP session
2345 when TLS is shut down. We test for this by sending a new EHLO. If we
2346 don't get a good response, we don't attempt to pass the socket on. */
2349 if (tls_out.active >= 0)
2351 tls_close(FALSE, TRUE);
2355 ok = smtp_write_command(&outblock,FALSE,"EHLO %s\r\n",helo_data) >= 0 &&
2356 smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
2357 ob->command_timeout);
2361 /* If the socket is successfully passed, we musn't send QUIT (or
2362 indeed anything!) from here. */
2364 if (ok && transport_pass_socket(tblock->name, host->name, host->address,
2365 new_message_id, inblock.sock))
2371 /* If RSET failed and there are addresses left, they get deferred. */
2373 else set_errno(first_addr, errno, msg, DEFER, FALSE);
2377 /* End off tidily with QUIT unless the connection has died or the socket has
2378 been passed to another process. There has been discussion on the net about what
2379 to do after sending QUIT. The wording of the RFC suggests that it is necessary
2380 to wait for a response, but on the other hand, there isn't anything one can do
2381 with an error response, other than log it. Exim used to do that. However,
2382 further discussion suggested that it is positively advantageous not to wait for
2383 the response, but to close the session immediately. This is supposed to move
2384 the TCP/IP TIME_WAIT state from the server to the client, thereby removing some
2385 load from the server. (Hosts that are both servers and clients may not see much
2386 difference, of course.) Further discussion indicated that this was safe to do
2387 on Unix systems which have decent implementations of TCP/IP that leave the
2388 connection around for a while (TIME_WAIT) after the application has gone away.
2389 This enables the response sent by the server to be properly ACKed rather than
2390 timed out, as can happen on broken TCP/IP implementations on other OS.
2392 This change is being made on 31-Jul-98. After over a year of trouble-free
2393 operation, the old commented-out code was removed on 17-Sep-99. */
2396 if (send_quit) (void)smtp_write_command(&outblock, FALSE, "QUIT\r\n");
2401 tls_close(FALSE, TRUE);
2404 /* Close the socket, and return the appropriate value, first setting
2405 continue_transport and continue_hostname NULL to prevent any other addresses
2406 that may include the host from trying to re-use a continuation socket. This
2407 works because the NULL setting is passed back to the calling process, and
2408 remote_max_parallel is forced to 1 when delivering over an existing connection,
2410 If all went well and continue_more is set, we shouldn't actually get here if
2411 there are further addresses, as the return above will be taken. However,
2412 writing RSET might have failed, or there may be other addresses whose hosts are
2413 specified in the transports, and therefore not visible at top level, in which
2414 case continue_more won't get set. */
2416 (void)close(inblock.sock);
2417 continue_transport = NULL;
2418 continue_hostname = NULL;
2425 /*************************************************
2426 * Closedown entry point *
2427 *************************************************/
2429 /* This function is called when exim is passed an open smtp channel
2430 from another incarnation, but the message which it has been asked
2431 to deliver no longer exists. The channel is on stdin.
2433 We might do fancy things like looking for another message to send down
2434 the channel, but if the one we sought has gone, it has probably been
2435 delivered by some other process that itself will seek further messages,
2436 so just close down our connection.
2438 Argument: pointer to the transport instance block
2443 smtp_transport_closedown(transport_instance *tblock)
2445 smtp_transport_options_block *ob =
2446 (smtp_transport_options_block *)(tblock->options_block);
2447 smtp_inblock inblock;
2448 smtp_outblock outblock;
2450 uschar inbuffer[4096];
2451 uschar outbuffer[16];
2453 inblock.sock = fileno(stdin);
2454 inblock.buffer = inbuffer;
2455 inblock.buffersize = sizeof(inbuffer);
2456 inblock.ptr = inbuffer;
2457 inblock.ptrend = inbuffer;
2459 outblock.sock = inblock.sock;
2460 outblock.buffersize = sizeof(outbuffer);
2461 outblock.buffer = outbuffer;
2462 outblock.ptr = outbuffer;
2463 outblock.cmd_count = 0;
2464 outblock.authenticating = FALSE;
2466 (void)smtp_write_command(&outblock, FALSE, "QUIT\r\n");
2467 (void)smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
2468 ob->command_timeout);
2469 (void)close(inblock.sock);
2474 /*************************************************
2475 * Prepare addresses for delivery *
2476 *************************************************/
2478 /* This function is called to flush out error settings from previous delivery
2479 attempts to other hosts. It also records whether we got here via an MX record
2480 or not in the more_errno field of the address. We are interested only in
2481 addresses that are still marked DEFER - others may have got delivered to a
2482 previously considered IP address. Set their status to PENDING_DEFER to indicate
2483 which ones are relevant this time.
2486 addrlist the list of addresses
2487 host the host we are delivering to
2489 Returns: the first address for this delivery
2492 static address_item *
2493 prepare_addresses(address_item *addrlist, host_item *host)
2495 address_item *first_addr = NULL;
2497 for (addr = addrlist; addr != NULL; addr = addr->next)
2499 if (addr->transport_return != DEFER) continue;
2500 if (first_addr == NULL) first_addr = addr;
2501 addr->transport_return = PENDING_DEFER;
2502 addr->basic_errno = 0;
2503 addr->more_errno = (host->mx >= 0)? 'M' : 'A';
2504 addr->message = NULL;
2506 addr->cipher = NULL;
2507 addr->peerdn = NULL;
2515 /*************************************************
2516 * Main entry point *
2517 *************************************************/
2519 /* See local README for interface details. As this is a remote transport, it is
2520 given a chain of addresses to be delivered in one connection, if possible. It
2521 always returns TRUE, indicating that each address has its own independent
2522 status set, except if there is a setting up problem, in which case it returns
2526 smtp_transport_entry(
2527 transport_instance *tblock, /* data for this instantiation */
2528 address_item *addrlist) /* addresses we are working on */
2532 int hosts_defer = 0;
2534 int hosts_looked_up = 0;
2535 int hosts_retry = 0;
2536 int hosts_serial = 0;
2537 int hosts_total = 0;
2538 int total_hosts_tried = 0;
2540 BOOL expired = TRUE;
2541 BOOL continuing = continue_hostname != NULL;
2542 uschar *expanded_hosts = NULL;
2544 uschar *tid = string_sprintf("%s transport", tblock->name);
2545 smtp_transport_options_block *ob =
2546 (smtp_transport_options_block *)(tblock->options_block);
2547 host_item *hostlist = addrlist->host_list;
2548 host_item *host = NULL;
2552 debug_printf("%s transport entered\n", tblock->name);
2553 for (addr = addrlist; addr != NULL; addr = addr->next)
2554 debug_printf(" %s\n", addr->address);
2555 if (continuing) debug_printf("already connected to %s [%s]\n",
2556 continue_hostname, continue_host_address);
2559 /* Set the flag requesting that these hosts be added to the waiting
2560 database if the delivery fails temporarily or if we are running with
2561 queue_smtp or a 2-stage queue run. This gets unset for certain
2562 kinds of error, typically those that are specific to the message. */
2564 update_waiting = TRUE;
2566 /* If a host list is not defined for the addresses - they must all have the
2567 same one in order to be passed to a single transport - or if the transport has
2568 a host list with hosts_override set, use the host list supplied with the
2569 transport. It is an error for this not to exist. */
2571 if (hostlist == NULL || (ob->hosts_override && ob->hosts != NULL))
2573 if (ob->hosts == NULL)
2575 addrlist->message = string_sprintf("%s transport called with no hosts set",
2577 addrlist->transport_return = PANIC;
2578 return FALSE; /* Only top address has status */
2581 DEBUG(D_transport) debug_printf("using the transport's hosts: %s\n",
2584 /* If the transport's host list contains no '$' characters, and we are not
2585 randomizing, it is fixed and therefore a chain of hosts can be built once
2586 and for all, and remembered for subsequent use by other calls to this
2587 transport. If, on the other hand, the host list does contain '$', or we are
2588 randomizing its order, we have to rebuild it each time. In the fixed case,
2589 as the hosts string will never be used again, it doesn't matter that we
2590 replace all the : characters with zeros. */
2592 if (ob->hostlist == NULL)
2594 uschar *s = ob->hosts;
2596 if (Ustrchr(s, '$') != NULL)
2598 expanded_hosts = expand_string(s);
2599 if (expanded_hosts == NULL)
2601 addrlist->message = string_sprintf("failed to expand list of hosts "
2602 "\"%s\" in %s transport: %s", s, tblock->name, expand_string_message);
2603 addrlist->transport_return = search_find_defer? DEFER : PANIC;
2604 return FALSE; /* Only top address has status */
2606 DEBUG(D_transport) debug_printf("expanded list of hosts \"%s\" to "
2607 "\"%s\"\n", s, expanded_hosts);
2611 if (ob->hosts_randomize) s = expanded_hosts = string_copy(s);
2613 host_build_hostlist(&hostlist, s, ob->hosts_randomize);
2615 /* Check that the expansion yielded something useful. */
2616 if (hostlist == NULL)
2619 string_sprintf("%s transport has empty hosts setting", tblock->name);
2620 addrlist->transport_return = PANIC;
2621 return FALSE; /* Only top address has status */
2624 /* If there was no expansion of hosts, save the host list for
2627 if (expanded_hosts == NULL) ob->hostlist = hostlist;
2630 /* This is not the first time this transport has been run in this delivery;
2631 the host list was built previously. */
2633 else hostlist = ob->hostlist;
2636 /* The host list was supplied with the address. If hosts_randomize is set, we
2637 must sort it into a random order if it did not come from MX records and has not
2638 already been randomized (but don't bother if continuing down an existing
2641 else if (ob->hosts_randomize && hostlist->mx == MX_NONE && !continuing)
2643 host_item *newlist = NULL;
2644 while (hostlist != NULL)
2646 host_item *h = hostlist;
2647 hostlist = hostlist->next;
2649 h->sort_key = random_number(100);
2651 if (newlist == NULL)
2656 else if (h->sort_key < newlist->sort_key)
2663 host_item *hh = newlist;
2664 while (hh->next != NULL)
2666 if (h->sort_key < hh->next->sort_key) break;
2674 hostlist = addrlist->host_list = newlist;
2678 /* Sort out the default port. */
2680 if (!smtp_get_port(ob->port, addrlist, &port, tid)) return FALSE;
2683 /* For each host-plus-IP-address on the list:
2685 . If this is a continued delivery and the host isn't the one with the
2686 current connection, skip.
2688 . If the status is unusable (i.e. previously failed or retry checked), skip.
2690 . If no IP address set, get the address, either by turning the name into
2691 an address, calling gethostbyname if gethostbyname is on, or by calling
2692 the DNS. The DNS may yield multiple addresses, in which case insert the
2693 extra ones into the list.
2695 . Get the retry data if not previously obtained for this address and set the
2696 field which remembers the state of this address. Skip if the retry time is
2697 not reached. If not, remember whether retry data was found. The retry string
2698 contains both the name and the IP address.
2700 . Scan the list of addresses and mark those whose status is DEFER as
2701 PENDING_DEFER. These are the only ones that will be processed in this cycle
2704 . Make a delivery attempt - addresses marked PENDING_DEFER will be tried.
2705 Some addresses may be successfully delivered, others may fail, and yet
2706 others may get temporary errors and so get marked DEFER.
2708 . The return from the delivery attempt is OK if a connection was made and a
2709 valid SMTP dialogue was completed. Otherwise it is DEFER.
2711 . If OK, add a "remove" retry item for this host/IPaddress, if any.
2713 . If fail to connect, or other defer state, add a retry item.
2715 . If there are any addresses whose status is still DEFER, carry on to the
2716 next host/IPaddress, unless we have tried the number of hosts given
2717 by hosts_max_try or hosts_max_try_hardlimit; otherwise return. Note that
2718 there is some fancy logic for hosts_max_try that means its limit can be
2719 overstepped in some circumstances.
2721 If we get to the end of the list, all hosts have deferred at least one address,
2722 or not reached their retry times. If delay_after_cutoff is unset, it requests a
2723 delivery attempt to those hosts whose last try was before the arrival time of
2724 the current message. To cope with this, we have to go round the loop a second
2725 time. After that, set the status and error data for any addresses that haven't
2726 had it set already. */
2728 for (cutoff_retry = 0; expired &&
2729 cutoff_retry < ((ob->delay_after_cutoff)? 1 : 2);
2732 host_item *nexthost = NULL;
2733 int unexpired_hosts_tried = 0;
2735 for (host = hostlist;
2737 unexpired_hosts_tried < ob->hosts_max_try &&
2738 total_hosts_tried < ob->hosts_max_try_hardlimit;
2744 BOOL serialized = FALSE;
2745 BOOL host_is_expired = FALSE;
2746 BOOL message_defer = FALSE;
2747 BOOL ifchanges = FALSE;
2748 BOOL some_deferred = FALSE;
2749 address_item *first_addr = NULL;
2750 uschar *interface = NULL;
2751 uschar *retry_host_key = NULL;
2752 uschar *retry_message_key = NULL;
2753 uschar *serialize_key = NULL;
2755 /* Default next host is next host. :-) But this can vary if the
2756 hosts_max_try limit is hit (see below). It may also be reset if a host
2757 address is looked up here (in case the host was multihomed). */
2759 nexthost = host->next;
2761 /* If the address hasn't yet been obtained from the host name, look it up
2762 now, unless the host is already marked as unusable. If it is marked as
2763 unusable, it means that the router was unable to find its IP address (in
2764 the DNS or wherever) OR we are in the 2nd time round the cutoff loop, and
2765 the lookup failed last time. We don't get this far if *all* MX records
2766 point to non-existent hosts; that is treated as a hard error.
2768 We can just skip this host entirely. When the hosts came from the router,
2769 the address will timeout based on the other host(s); when the address is
2770 looked up below, there is an explicit retry record added.
2772 Note that we mustn't skip unusable hosts if the address is not unset; they
2773 may be needed as expired hosts on the 2nd time round the cutoff loop. */
2775 if (host->address == NULL)
2777 int new_port, flags;
2779 uschar *canonical_name;
2781 if (host->status >= hstatus_unusable)
2783 DEBUG(D_transport) debug_printf("%s has no address and is unusable - skipping\n",
2788 DEBUG(D_transport) debug_printf("getting address for %s\n", host->name);
2790 /* The host name is permitted to have an attached port. Find it, and
2791 strip it from the name. Just remember it for now. */
2793 new_port = host_item_get_port(host);
2795 /* Count hosts looked up */
2799 /* Find by name if so configured, or if it's an IP address. We don't
2800 just copy the IP address, because we need the test-for-local to happen. */
2802 flags = HOST_FIND_BY_A;
2803 if (ob->dns_qualify_single) flags |= HOST_FIND_QUALIFY_SINGLE;
2804 if (ob->dns_search_parents) flags |= HOST_FIND_SEARCH_PARENTS;
2806 if (ob->gethostbyname || string_is_ip_address(host->name, NULL) != 0)
2807 rc = host_find_byname(host, NULL, flags, &canonical_name, TRUE);
2809 rc = host_find_bydns(host, NULL, flags, NULL, NULL, NULL,
2810 &canonical_name, NULL);
2812 /* Update the host (and any additional blocks, resulting from
2813 multihoming) with a host-specific port, if any. */
2815 for (hh = host; hh != nexthost; hh = hh->next) hh->port = new_port;
2817 /* Failure to find the host at this time (usually DNS temporary failure)
2818 is really a kind of routing failure rather than a transport failure.
2819 Therefore we add a retry item of the routing kind, not to stop us trying
2820 to look this name up here again, but to ensure the address gets timed
2821 out if the failures go on long enough. A complete failure at this point
2822 commonly points to a configuration error, but the best action is still
2823 to carry on for the next host. */
2825 if (rc == HOST_FIND_AGAIN || rc == HOST_FIND_FAILED)
2827 retry_add_item(addrlist, string_sprintf("R:%s", host->name), 0);
2829 if (rc == HOST_FIND_AGAIN) hosts_defer++; else hosts_fail++;
2830 DEBUG(D_transport) debug_printf("rc = %s for %s\n", (rc == HOST_FIND_AGAIN)?
2831 "HOST_FIND_AGAIN" : "HOST_FIND_FAILED", host->name);
2832 host->status = hstatus_unusable;
2834 for (addr = addrlist; addr != NULL; addr = addr->next)
2836 if (addr->transport_return != DEFER) continue;
2837 addr->basic_errno = ERRNO_UNKNOWNHOST;
2839 string_sprintf("failed to lookup IP address for %s", host->name);
2844 /* If the host is actually the local host, we may have a problem, or
2845 there may be some cunning configuration going on. In the problem case,
2846 log things and give up. The default transport status is already DEFER. */
2848 if (rc == HOST_FOUND_LOCAL && !ob->allow_localhost)
2850 for (addr = addrlist; addr != NULL; addr = addr->next)
2852 addr->basic_errno = 0;
2853 addr->message = string_sprintf("%s transport found host %s to be "
2854 "local", tblock->name, host->name);
2858 } /* End of block for IP address lookup */
2860 /* If this is a continued delivery, we are interested only in the host
2861 which matches the name of the existing open channel. The check is put
2862 here after the local host lookup, in case the name gets expanded as a
2863 result of the lookup. Set expired FALSE, to save the outer loop executing
2866 if (continuing && (Ustrcmp(continue_hostname, host->name) != 0 ||
2867 Ustrcmp(continue_host_address, host->address) != 0))
2870 continue; /* With next host */
2873 /* Reset the default next host in case a multihomed host whose addresses
2874 are not looked up till just above added to the host list. */
2876 nexthost = host->next;
2878 /* If queue_smtp is set (-odqs or the first part of a 2-stage run), or the
2879 domain is in queue_smtp_domains, we don't actually want to attempt any
2880 deliveries. When doing a queue run, queue_smtp_domains is always unset. If
2881 there is a lookup defer in queue_smtp_domains, proceed as if the domain
2882 were not in it. We don't want to hold up all SMTP deliveries! Except when
2883 doing a two-stage queue run, don't do this if forcing. */
2885 if ((!deliver_force || queue_2stage) && (queue_smtp ||
2886 match_isinlist(addrlist->domain, &queue_smtp_domains, 0,
2887 &domainlist_anchor, NULL, MCL_DOMAIN, TRUE, NULL) == OK))
2890 for (addr = addrlist; addr != NULL; addr = addr->next)
2892 if (addr->transport_return != DEFER) continue;
2893 addr->message = US"domain matches queue_smtp_domains, or -odqs set";
2895 continue; /* With next host */
2898 /* Count hosts being considered - purely for an intelligent comment
2899 if none are usable. */
2903 /* Set $host and $host address now in case they are needed for the
2904 interface expansion or the serialize_hosts check; they remain set if an
2905 actual delivery happens. */
2907 deliver_host = host->name;
2908 deliver_host_address = host->address;
2910 /* Set up a string for adding to the retry key if the port number is not
2911 the standard SMTP port. A host may have its own port setting that overrides
2914 pistring = string_sprintf(":%d", (host->port == PORT_NONE)?
2916 if (Ustrcmp(pistring, ":25") == 0) pistring = US"";
2918 /* Select IPv4 or IPv6, and choose an outgoing interface. If the interface
2919 string changes upon expansion, we must add it to the key that is used for
2920 retries, because connections to the same host from a different interface
2921 should be treated separately. */
2923 host_af = (Ustrchr(host->address, ':') == NULL)? AF_INET : AF_INET6;
2924 if (!smtp_get_interface(ob->interface, host_af, addrlist, &ifchanges,
2927 if (ifchanges) pistring = string_sprintf("%s/%s", pistring, interface);
2929 /* The first time round the outer loop, check the status of the host by
2930 inspecting the retry data. The second time round, we are interested only
2931 in expired hosts that haven't been tried since this message arrived. */
2933 if (cutoff_retry == 0)
2935 /* Ensure the status of the address is set by checking retry data if
2936 necessary. There maybe host-specific retry data (applicable to all
2937 messages) and also data for retries of a specific message at this host.
2938 If either of these retry records are actually read, the keys used are
2939 returned to save recomputing them later. */
2941 host_is_expired = retry_check_address(addrlist->domain, host, pistring,
2942 ob->retry_include_ip_address, &retry_host_key, &retry_message_key);
2944 DEBUG(D_transport) debug_printf("%s [%s]%s status = %s\n", host->name,
2945 (host->address == NULL)? US"" : host->address, pistring,
2946 (host->status == hstatus_usable)? "usable" :
2947 (host->status == hstatus_unusable)? "unusable" :
2948 (host->status == hstatus_unusable_expired)? "unusable (expired)" : "?");
2950 /* Skip this address if not usable at this time, noting if it wasn't
2951 actually expired, both locally and in the address. */
2953 switch (host->status)
2955 case hstatus_unusable:
2957 setflag(addrlist, af_retry_skipped);
2960 case hstatus_unusable_expired:
2963 case hwhy_retry: hosts_retry++; break;
2964 case hwhy_failed: hosts_fail++; break;
2965 case hwhy_deferred: hosts_defer++; break;
2968 /* If there was a retry message key, implying that previously there
2969 was a message-specific defer, we don't want to update the list of
2970 messages waiting for these hosts. */
2972 if (retry_message_key != NULL) update_waiting = FALSE;
2973 continue; /* With the next host or IP address */
2977 /* Second time round the loop: if the address is set but expired, and
2978 the message is newer than the last try, let it through. */
2982 if (host->address == NULL ||
2983 host->status != hstatus_unusable_expired ||
2984 host->last_try > received_time)
2987 debug_printf("trying expired host %s [%s]%s\n",
2988 host->name, host->address, pistring);
2989 host_is_expired = TRUE;
2992 /* Setting "expired=FALSE" doesn't actually mean not all hosts are expired;
2993 it remains TRUE only if all hosts are expired and none are actually tried.
2998 /* If this host is listed as one to which access must be serialized,
2999 see if another Exim process has a connection to it, and if so, skip
3000 this host. If not, update the database to record our connection to it
3001 and remember this for later deletion. Do not do any of this if we are
3002 sending the message down a pre-existing connection. */
3005 verify_check_this_host(&(ob->serialize_hosts), NULL, host->name,
3006 host->address, NULL) == OK)
3008 serialize_key = string_sprintf("host-serialize-%s", host->name);
3009 if (!enq_start(serialize_key))
3012 debug_printf("skipping host %s because another Exim process "
3013 "is connected to it\n", host->name);
3020 /* OK, we have an IP address that is not waiting for its retry time to
3021 arrive (it might be expired) OR (second time round the loop) we have an
3022 expired host that hasn't been tried since the message arrived. Have a go
3023 at delivering the message to it. First prepare the addresses by flushing
3024 out the result of previous attempts, and finding the first address that
3025 is still to be delivered. */
3027 first_addr = prepare_addresses(addrlist, host);
3029 DEBUG(D_transport) debug_printf("delivering %s to %s [%s] (%s%s)\n",
3030 message_id, host->name, host->address, addrlist->address,
3031 (addrlist->next == NULL)? "" : ", ...");
3033 set_process_info("delivering %s to %s [%s] (%s%s)",
3034 message_id, host->name, host->address, addrlist->address,
3035 (addrlist->next == NULL)? "" : ", ...");
3037 /* This is not for real; don't do the delivery. If there are
3038 any remaining hosts, list them. */
3043 set_errno(addrlist, 0, NULL, OK, FALSE);
3044 for (addr = addrlist; addr != NULL; addr = addr->next)
3046 addr->host_used = host;
3047 addr->special_action = '*';
3048 addr->message = US"delivery bypassed by -N option";
3052 debug_printf("*** delivery by %s transport bypassed by -N option\n"
3053 "*** host and remaining hosts:\n", tblock->name);
3054 for (host2 = host; host2 != NULL; host2 = host2->next)
3055 debug_printf(" %s [%s]\n", host2->name,
3056 (host2->address == NULL)? US"unset" : host2->address);
3061 /* This is for real. If the host is expired, we don't count it for
3062 hosts_max_retry. This ensures that all hosts must expire before an address
3063 is timed out, unless hosts_max_try_hardlimit (which protects against
3064 lunatic DNS configurations) is reached.
3066 If the host is not expired and we are about to hit the hosts_max_retry
3067 limit, check to see if there is a subsequent hosts with a different MX
3068 value. If so, make that the next host, and don't count this one. This is a
3069 heuristic to make sure that different MXs do get tried. With a normal kind
3070 of retry rule, they would get tried anyway when the earlier hosts were
3071 delayed, but if the domain has a "retry every time" type of rule - as is
3072 often used for the the very large ISPs, that won't happen. */
3076 if (!host_is_expired && ++unexpired_hosts_tried >= ob->hosts_max_try)
3080 debug_printf("hosts_max_try limit reached with this host\n");
3081 for (h = host; h != NULL; h = h->next)
3082 if (h->mx != host->mx) break;
3086 unexpired_hosts_tried--;
3087 DEBUG(D_transport) debug_printf("however, a higher MX host exists "
3088 "and will be tried\n");
3092 /* Attempt the delivery. */
3094 total_hosts_tried++;
3095 rc = smtp_deliver(addrlist, host, host_af, port, interface, tblock,
3096 expanded_hosts != NULL, &message_defer, FALSE);
3099 OK => connection made, each address contains its result;
3100 message_defer is set for message-specific defers (when all
3101 recipients are marked defer)
3102 DEFER => there was a non-message-specific delivery problem;
3103 ERROR => there was a problem setting up the arguments for a filter,
3104 or there was a problem with expanding added headers
3107 /* If the result is not OK, there was a non-message-specific problem.
3108 If the result is DEFER, we need to write to the logs saying what happened
3109 for this particular host, except in the case of authentication and TLS
3110 failures, where the log has already been written. If all hosts defer a
3111 general message is written at the end. */
3113 if (rc == DEFER && first_addr->basic_errno != ERRNO_AUTHFAIL &&
3114 first_addr->basic_errno != ERRNO_TLSFAILURE)
3115 write_logs(first_addr, host);
3117 #ifdef EXPERIMENTAL_TPDA
3119 tpda_deferred(ob, first_addr, host);
3122 /* If STARTTLS was accepted, but there was a failure in setting up the
3123 TLS session (usually a certificate screwup), and the host is not in
3124 hosts_require_tls, and tls_tempfail_tryclear is true, try again, with
3125 TLS forcibly turned off. We have to start from scratch with a new SMTP
3126 connection. That's why the retry is done from here, not from within
3127 smtp_deliver(). [Rejections of STARTTLS itself don't screw up the
3128 session, so the in-clear transmission after those errors, if permitted,
3129 happens inside smtp_deliver().] */
3132 if (rc == DEFER && first_addr->basic_errno == ERRNO_TLSFAILURE &&
3133 ob->tls_tempfail_tryclear &&
3134 verify_check_this_host(&(ob->hosts_require_tls), NULL, host->name,
3135 host->address, NULL) != OK)
3137 log_write(0, LOG_MAIN, "TLS session failure: delivering unencrypted "
3138 "to %s [%s] (not in hosts_require_tls)", host->name, host->address);
3139 first_addr = prepare_addresses(addrlist, host);
3140 rc = smtp_deliver(addrlist, host, host_af, port, interface, tblock,
3141 expanded_hosts != NULL, &message_defer, TRUE);
3142 if (rc == DEFER && first_addr->basic_errno != ERRNO_AUTHFAIL)
3143 write_logs(first_addr, host);
3144 #ifdef EXPERIMENTAL_TPDA
3146 tpda_deferred(ob, first_addr, host);
3152 /* Delivery attempt finished */
3154 rs = (rc == OK)? US"OK" : (rc == DEFER)? US"DEFER" : (rc == ERROR)?
3157 set_process_info("delivering %s: just tried %s [%s] for %s%s: result %s",
3158 message_id, host->name, host->address, addrlist->address,
3159 (addrlist->next == NULL)? "" : " (& others)", rs);
3161 /* Release serialization if set up */
3163 if (serialized) enq_end(serialize_key);
3165 /* If the result is DEFER, or if a host retry record is known to exist, we
3166 need to add an item to the retry chain for updating the retry database
3167 at the end of delivery. We only need to add the item to the top address,
3168 of course. Also, if DEFER, we mark the IP address unusable so as to skip it
3169 for any other delivery attempts using the same address. (It is copied into
3170 the unusable tree at the outer level, so even if different address blocks
3171 contain the same address, it still won't get tried again.) */
3173 if (rc == DEFER || retry_host_key != NULL)
3175 int delete_flag = (rc != DEFER)? rf_delete : 0;
3176 if (retry_host_key == NULL)
3178 retry_host_key = ob->retry_include_ip_address?
3179 string_sprintf("T:%S:%s%s", host->name, host->address, pistring) :
3180 string_sprintf("T:%S%s", host->name, pistring);
3183 /* If a delivery of another message over an existing SMTP connection
3184 yields DEFER, we do NOT set up retry data for the host. This covers the
3185 case when there are delays in routing the addresses in the second message
3186 that are so long that the server times out. This is alleviated by not
3187 routing addresses that previously had routing defers when handling an
3188 existing connection, but even so, this case may occur (e.g. if a
3189 previously happily routed address starts giving routing defers). If the
3190 host is genuinely down, another non-continued message delivery will
3191 notice it soon enough. */
3193 if (delete_flag != 0 || !continuing)
3194 retry_add_item(first_addr, retry_host_key, rf_host | delete_flag);
3196 /* We may have tried an expired host, if its retry time has come; ensure
3197 the status reflects the expiry for the benefit of any other addresses. */
3201 host->status = (host_is_expired)?
3202 hstatus_unusable_expired : hstatus_unusable;
3203 host->why = hwhy_deferred;
3207 /* If message_defer is set (host was OK, but every recipient got deferred
3208 because of some message-specific problem), or if that had happened
3209 previously so that a message retry key exists, add an appropriate item
3210 to the retry chain. Note that if there was a message defer but now there is
3211 a host defer, the message defer record gets deleted. That seems perfectly
3212 reasonable. Also, stop the message from being remembered as waiting
3213 for specific hosts. */
3215 if (message_defer || retry_message_key != NULL)
3217 int delete_flag = message_defer? 0 : rf_delete;
3218 if (retry_message_key == NULL)
3220 retry_message_key = ob->retry_include_ip_address?
3221 string_sprintf("T:%S:%s%s:%s", host->name, host->address, pistring,
3223 string_sprintf("T:%S%s:%s", host->name, pistring, message_id);
3225 retry_add_item(addrlist, retry_message_key,
3226 rf_message | rf_host | delete_flag);
3227 update_waiting = FALSE;
3230 /* Any return other than DEFER (that is, OK or ERROR) means that the
3231 addresses have got their final statuses filled in for this host. In the OK
3232 case, see if any of them are deferred. */
3236 for (addr = addrlist; addr != NULL; addr = addr->next)
3238 if (addr->transport_return == DEFER)
3240 some_deferred = TRUE;
3246 /* If no addresses deferred or the result was ERROR, return. We do this for
3247 ERROR because a failing filter set-up or add_headers expansion is likely to
3248 fail for any host we try. */
3250 if (rc == ERROR || (rc == OK && !some_deferred))
3252 DEBUG(D_transport) debug_printf("Leaving %s transport\n", tblock->name);
3253 return TRUE; /* Each address has its status */
3256 /* If the result was DEFER or some individual addresses deferred, let
3257 the loop run to try other hosts with the deferred addresses, except for the
3258 case when we were trying to deliver down an existing channel and failed.
3259 Don't try any other hosts in this case. */
3261 if (continuing) break;
3263 /* If the whole delivery, or some individual addresses, were deferred and
3264 there are more hosts that could be tried, do not count this host towards
3265 the hosts_max_try limit if the age of the message is greater than the
3266 maximum retry time for this host. This means we may try try all hosts,
3267 ignoring the limit, when messages have been around for some time. This is
3268 important because if we don't try all hosts, the address will never time
3269 out. NOTE: this does not apply to hosts_max_try_hardlimit. */
3271 if ((rc == DEFER || some_deferred) && nexthost != NULL)
3274 retry_config *retry = retry_find_config(host->name, NULL, 0, 0);
3276 if (retry != NULL && retry->rules != NULL)
3278 retry_rule *last_rule;
3279 for (last_rule = retry->rules;
3280 last_rule->next != NULL;
3281 last_rule = last_rule->next);
3282 timedout = time(NULL) - received_time > last_rule->timeout;
3284 else timedout = TRUE; /* No rule => timed out */
3288 unexpired_hosts_tried--;
3289 DEBUG(D_transport) debug_printf("temporary delivery error(s) override "
3290 "hosts_max_try (message older than host's retry time)\n");
3293 } /* End of loop for trying multiple hosts. */
3295 /* This is the end of the loop that repeats iff expired is TRUE and
3296 ob->delay_after_cutoff is FALSE. The second time round we will
3297 try those hosts that haven't been tried since the message arrived. */
3301 debug_printf("all IP addresses skipped or deferred at least one address\n");
3302 if (expired && !ob->delay_after_cutoff && cutoff_retry == 0)
3303 debug_printf("retrying IP addresses not tried since message arrived\n");
3308 /* Get here if all IP addresses are skipped or defer at least one address. In
3309 MUA wrapper mode, this will happen only for connection or other non-message-
3310 specific failures. Force the delivery status for all addresses to FAIL. */
3314 for (addr = addrlist; addr != NULL; addr = addr->next)
3315 addr->transport_return = FAIL;
3319 /* In the normal, non-wrapper case, add a standard message to each deferred
3320 address if there hasn't been an error, that is, if it hasn't actually been
3321 tried this time. The variable "expired" will be FALSE if any deliveries were
3322 actually tried, or if there was at least one host that was not expired. That
3323 is, it is TRUE only if no deliveries were tried and all hosts were expired. If
3324 a delivery has been tried, an error code will be set, and the failing of the
3325 message is handled by the retry code later.
3327 If queue_smtp is set, or this transport was called to send a subsequent message
3328 down an existing TCP/IP connection, and something caused the host not to be
3329 found, we end up here, but can detect these cases and handle them specially. */
3331 for (addr = addrlist; addr != NULL; addr = addr->next)
3333 /* If host is not NULL, it means that we stopped processing the host list
3334 because of hosts_max_try or hosts_max_try_hardlimit. In the former case, this
3335 means we need to behave as if some hosts were skipped because their retry
3336 time had not come. Specifically, this prevents the address from timing out.
3337 However, if we have hit hosts_max_try_hardlimit, we want to behave as if all
3338 hosts were tried. */
3342 if (total_hosts_tried >= ob->hosts_max_try_hardlimit)
3345 debug_printf("hosts_max_try_hardlimit reached: behave as if all "
3346 "hosts were tried\n");
3351 debug_printf("hosts_max_try limit caused some hosts to be skipped\n");
3352 setflag(addr, af_retry_skipped);
3356 if (queue_smtp) /* no deliveries attempted */
3358 addr->transport_return = DEFER;
3359 addr->basic_errno = 0;
3360 addr->message = US"SMTP delivery explicitly queued";
3363 else if (addr->transport_return == DEFER &&
3364 (addr->basic_errno == ERRNO_UNKNOWNERROR || addr->basic_errno == 0) &&
3365 addr->message == NULL)
3367 addr->basic_errno = ERRNO_HRETRY;
3368 if (continue_hostname != NULL)
3370 addr->message = US"no host found for existing SMTP connection";
3374 setflag(addr, af_pass_message); /* This is not a security risk */
3375 addr->message = (ob->delay_after_cutoff)?
3376 US"retry time not reached for any host after a long failure period" :
3377 US"all hosts have been failing for a long time and were last tried "
3378 "after this message arrived";
3380 /* If we are already using fallback hosts, or there are no fallback hosts
3381 defined, convert the result to FAIL to cause a bounce. */
3383 if (addr->host_list == addr->fallback_hosts ||
3384 addr->fallback_hosts == NULL)
3385 addr->transport_return = FAIL;
3389 if (hosts_retry == hosts_total)
3390 addr->message = US"retry time not reached for any host";
3391 else if (hosts_fail == hosts_total)
3392 addr->message = US"all host address lookups failed permanently";
3393 else if (hosts_defer == hosts_total)
3394 addr->message = US"all host address lookups failed temporarily";
3395 else if (hosts_serial == hosts_total)
3396 addr->message = US"connection limit reached for all hosts";
3397 else if (hosts_fail+hosts_defer == hosts_total)
3398 addr->message = US"all host address lookups failed";
3399 else addr->message = US"some host address lookups failed and retry time "
3400 "not reached for other hosts or connection limit reached";
3405 /* Update the database which keeps information about which messages are waiting
3406 for which hosts to become available. For some message-specific errors, the
3407 update_waiting flag is turned off because we don't want follow-on deliveries in
3408 those cases. If this transport instance is explicitly limited to one message
3409 per connection then follow-on deliveries are not possible and there's no need
3410 to create/update the per-transport wait-<transport_name> database. */
3412 if (update_waiting && tblock->connection_max_messages != 1)
3413 transport_update_waiting(hostlist, tblock->name);
3417 DEBUG(D_transport) debug_printf("Leaving %s transport\n", tblock->name);
3419 return TRUE; /* Each address has its status */
3422 /* End of transport/smtp.c */
git://git.exim.org / users / jgh / exim.git / blob