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 #ifdef EXPERIMENTAL_DBL
39 { "dbl_host_defer_query", opt_stringptr,
40 (void *)offsetof(smtp_transport_options_block, dbl_host_defer_query) },
42 { "delay_after_cutoff", opt_bool,
43 (void *)offsetof(smtp_transport_options_block, delay_after_cutoff) },
45 { "dkim_canon", opt_stringptr,
46 (void *)offsetof(smtp_transport_options_block, dkim_canon) },
47 { "dkim_domain", opt_stringptr,
48 (void *)offsetof(smtp_transport_options_block, dkim_domain) },
49 { "dkim_private_key", opt_stringptr,
50 (void *)offsetof(smtp_transport_options_block, dkim_private_key) },
51 { "dkim_selector", opt_stringptr,
52 (void *)offsetof(smtp_transport_options_block, dkim_selector) },
53 { "dkim_sign_headers", opt_stringptr,
54 (void *)offsetof(smtp_transport_options_block, dkim_sign_headers) },
55 { "dkim_strict", opt_stringptr,
56 (void *)offsetof(smtp_transport_options_block, dkim_strict) },
58 { "dns_qualify_single", opt_bool,
59 (void *)offsetof(smtp_transport_options_block, dns_qualify_single) },
60 { "dns_search_parents", opt_bool,
61 (void *)offsetof(smtp_transport_options_block, dns_search_parents) },
62 { "dscp", opt_stringptr,
63 (void *)offsetof(smtp_transport_options_block, dscp) },
64 { "fallback_hosts", opt_stringptr,
65 (void *)offsetof(smtp_transport_options_block, fallback_hosts) },
66 { "final_timeout", opt_time,
67 (void *)offsetof(smtp_transport_options_block, final_timeout) },
68 { "gethostbyname", opt_bool,
69 (void *)offsetof(smtp_transport_options_block, gethostbyname) },
71 /* These are no longer honoured, as of Exim 4.80; for now, we silently
72 ignore; a later release will warn, and a later-still release will remove
73 these options, so that using them becomes an error. */
74 { "gnutls_require_kx", opt_stringptr,
75 (void *)offsetof(smtp_transport_options_block, gnutls_require_kx) },
76 { "gnutls_require_mac", opt_stringptr,
77 (void *)offsetof(smtp_transport_options_block, gnutls_require_mac) },
78 { "gnutls_require_protocols", opt_stringptr,
79 (void *)offsetof(smtp_transport_options_block, gnutls_require_proto) },
81 { "helo_data", opt_stringptr,
82 (void *)offsetof(smtp_transport_options_block, helo_data) },
83 { "hosts", opt_stringptr,
84 (void *)offsetof(smtp_transport_options_block, hosts) },
85 { "hosts_avoid_esmtp", opt_stringptr,
86 (void *)offsetof(smtp_transport_options_block, hosts_avoid_esmtp) },
87 { "hosts_avoid_pipelining", opt_stringptr,
88 (void *)offsetof(smtp_transport_options_block, hosts_avoid_pipelining) },
90 { "hosts_avoid_tls", opt_stringptr,
91 (void *)offsetof(smtp_transport_options_block, hosts_avoid_tls) },
93 { "hosts_max_try", opt_int,
94 (void *)offsetof(smtp_transport_options_block, hosts_max_try) },
95 { "hosts_max_try_hardlimit", opt_int,
96 (void *)offsetof(smtp_transport_options_block, hosts_max_try_hardlimit) },
98 { "hosts_nopass_tls", opt_stringptr,
99 (void *)offsetof(smtp_transport_options_block, hosts_nopass_tls) },
101 { "hosts_override", opt_bool,
102 (void *)offsetof(smtp_transport_options_block, hosts_override) },
103 { "hosts_randomize", opt_bool,
104 (void *)offsetof(smtp_transport_options_block, hosts_randomize) },
105 { "hosts_require_auth", opt_stringptr,
106 (void *)offsetof(smtp_transport_options_block, hosts_require_auth) },
108 # if defined EXPERIMENTAL_OCSP
109 { "hosts_require_ocsp", opt_stringptr,
110 (void *)offsetof(smtp_transport_options_block, hosts_require_ocsp) },
112 { "hosts_require_tls", opt_stringptr,
113 (void *)offsetof(smtp_transport_options_block, hosts_require_tls) },
115 { "hosts_try_auth", opt_stringptr,
116 (void *)offsetof(smtp_transport_options_block, hosts_try_auth) },
117 #ifdef EXPERIMENTAL_PRDR
118 { "hosts_try_prdr", opt_stringptr,
119 (void *)offsetof(smtp_transport_options_block, hosts_try_prdr) },
122 { "hosts_verify_avoid_tls", opt_stringptr,
123 (void *)offsetof(smtp_transport_options_block, hosts_verify_avoid_tls) },
125 { "interface", opt_stringptr,
126 (void *)offsetof(smtp_transport_options_block, interface) },
127 { "keepalive", opt_bool,
128 (void *)offsetof(smtp_transport_options_block, keepalive) },
129 { "lmtp_ignore_quota", opt_bool,
130 (void *)offsetof(smtp_transport_options_block, lmtp_ignore_quota) },
131 { "max_rcpt", opt_int | opt_public,
132 (void *)offsetof(transport_instance, max_addresses) },
133 { "multi_domain", opt_bool | opt_public,
134 (void *)offsetof(transport_instance, multi_domain) },
135 { "port", opt_stringptr,
136 (void *)offsetof(smtp_transport_options_block, port) },
137 { "protocol", opt_stringptr,
138 (void *)offsetof(smtp_transport_options_block, protocol) },
139 { "retry_include_ip_address", opt_bool,
140 (void *)offsetof(smtp_transport_options_block, retry_include_ip_address) },
141 { "serialize_hosts", opt_stringptr,
142 (void *)offsetof(smtp_transport_options_block, serialize_hosts) },
143 { "size_addition", opt_int,
144 (void *)offsetof(smtp_transport_options_block, size_addition) }
146 ,{ "tls_certificate", opt_stringptr,
147 (void *)offsetof(smtp_transport_options_block, tls_certificate) },
148 { "tls_crl", opt_stringptr,
149 (void *)offsetof(smtp_transport_options_block, tls_crl) },
150 { "tls_dh_min_bits", opt_int,
151 (void *)offsetof(smtp_transport_options_block, tls_dh_min_bits) },
152 { "tls_privatekey", opt_stringptr,
153 (void *)offsetof(smtp_transport_options_block, tls_privatekey) },
154 { "tls_require_ciphers", opt_stringptr,
155 (void *)offsetof(smtp_transport_options_block, tls_require_ciphers) },
156 { "tls_sni", opt_stringptr,
157 (void *)offsetof(smtp_transport_options_block, tls_sni) },
158 { "tls_tempfail_tryclear", opt_bool,
159 (void *)offsetof(smtp_transport_options_block, tls_tempfail_tryclear) },
160 { "tls_verify_certificates", opt_stringptr,
161 (void *)offsetof(smtp_transport_options_block, tls_verify_certificates) }
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_DBL
241 ,NULL /* dbl_host_defer_query */
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_DBL
588 /*************************************************
589 * Write error message to database log *
590 *************************************************/
592 /* This expands an arbitrary per-transport string.
593 It might, for example, be used to write to the database log.
596 dbl_host_defer_query dbl_host_defer_query from the transport options block
597 addr the address item containing error information
598 host the current host
604 dbl_write_defer_log(uschar *dbl_host_defer_query, address_item *addr, host_item *host)
606 if (dbl_host_defer_query == NULL)
609 dbl_delivery_ip = string_copy(host->address);
610 dbl_delivery_port = (host->port == PORT_NONE)? 25 : host->port;
611 dbl_delivery_fqdn = string_copy(host->name);
612 dbl_delivery_local_part = string_copy(addr->local_part);
613 dbl_delivery_domain = string_copy(addr->domain);
614 dbl_defer_errno = addr->basic_errno;
616 dbl_defer_errstr = (addr->message != NULL)
617 ? (addr->basic_errno > 0)
618 ? string_sprintf("%s: %s", addr->message, strerror(addr->basic_errno))
619 : string_copy(addr->message)
620 : (addr->basic_errno > 0)
621 ? string_copy(strerror(addr->basic_errno))
625 debug_printf(" DBL(host defer): dbl_host_defer_query=|%s| dbl_delivery_IP=%s\n", dbl_host_defer_query, dbl_delivery_ip);
628 router_name = addr->router->name;
629 transport_name = addr->transport->name;
630 expand_string(dbl_host_defer_query);
631 router_name = transport_name = NULL;
637 /*************************************************
638 * Synchronize SMTP responses *
639 *************************************************/
641 /* This function is called from smtp_deliver() to receive SMTP responses from
642 the server, and match them up with the commands to which they relate. When
643 PIPELINING is not in use, this function is called after every command, and is
644 therefore somewhat over-engineered, but it is simpler to use a single scheme
645 that works both with and without PIPELINING instead of having two separate sets
648 The set of commands that are buffered up with pipelining may start with MAIL
649 and may end with DATA; in between are RCPT commands that correspond to the
650 addresses whose status is PENDING_DEFER. All other commands (STARTTLS, AUTH,
651 etc.) are never buffered.
653 Errors after MAIL or DATA abort the whole process leaving the response in the
654 buffer. After MAIL, pending responses are flushed, and the original command is
655 re-instated in big_buffer for error messages. For RCPT commands, the remote is
656 permitted to reject some recipient addresses while accepting others. However
657 certain errors clearly abort the whole process. Set the value in
658 transport_return to PENDING_OK if the address is accepted. If there is a
659 subsequent general error, it will get reset accordingly. If not, it will get
660 converted to OK at the end.
663 addrlist the complete address list
664 include_affixes TRUE if affixes include in RCPT
665 sync_addr ptr to the ptr of the one to start scanning at (updated)
666 host the host we are connected to
667 count the number of responses to read
669 include_sender true if 4xx retry is to include the sender it its key
670 pending_MAIL true if the first response is for MAIL
671 pending_DATA 0 if last command sent was not DATA
672 +1 if previously had a good recipient
673 -1 if not previously had a good recipient
674 inblock incoming SMTP block
675 timeout timeout value
676 buffer buffer for reading response
677 buffsize size of buffer
679 Returns: 3 if at least one address had 2xx and one had 5xx
680 2 if at least one address had 5xx but none had 2xx
681 1 if at least one host had a 2xx response, but none had 5xx
682 0 no address had 2xx or 5xx but no errors (all 4xx, or just DATA)
683 -1 timeout while reading RCPT response
684 -2 I/O or other non-response error for RCPT
685 -3 DATA or MAIL failed - errno and buffer set
689 sync_responses(address_item *addrlist, BOOL include_affixes,
690 address_item **sync_addr, host_item *host, int count,
691 BOOL address_retry_include_sender, BOOL pending_MAIL,
692 int pending_DATA, smtp_inblock *inblock, int timeout, uschar *buffer,
695 address_item *addr = *sync_addr;
698 /* Handle the response for a MAIL command. On error, reinstate the original
699 command in big_buffer for error message use, and flush any further pending
700 responses before returning, except after I/O errors and timeouts. */
705 if (!smtp_read_response(inblock, buffer, buffsize, '2', timeout))
707 Ustrcpy(big_buffer, mail_command); /* Fits, because it came from there! */
708 if (errno == 0 && buffer[0] != 0)
710 uschar flushbuffer[4096];
712 if (buffer[0] == '4')
714 save_errno = ERRNO_MAIL4XX;
715 addr->more_errno |= ((buffer[1] - '0')*10 + buffer[2] - '0') << 8;
719 if (!smtp_read_response(inblock, flushbuffer, sizeof(flushbuffer),
721 && (errno != 0 || flushbuffer[0] == 0))
730 if (pending_DATA) count--; /* Number of RCPT responses to come */
732 /* Read and handle the required number of RCPT responses, matching each one up
733 with an address by scanning for the next address whose status is PENDING_DEFER.
738 while (addr->transport_return != PENDING_DEFER) addr = addr->next;
740 /* The address was accepted */
742 if (smtp_read_response(inblock, buffer, buffsize, '2', timeout))
745 addr->transport_return = PENDING_OK;
747 /* If af_dr_retry_exists is set, there was a routing delay on this address;
748 ensure that any address-specific retry record is expunged. We do this both
749 for the basic key and for the version that also includes the sender. */
751 if (testflag(addr, af_dr_retry_exists))
753 uschar *altkey = string_sprintf("%s:<%s>", addr->address_retry_key,
755 retry_add_item(addr, altkey, rf_delete);
756 retry_add_item(addr, addr->address_retry_key, rf_delete);
760 /* Timeout while reading the response */
762 else if (errno == ETIMEDOUT)
764 int save_errno = errno;
765 uschar *message = string_sprintf("SMTP timeout while connected to %s [%s] "
766 "after RCPT TO:<%s>", host->name, host->address,
767 transport_rcpt_address(addr, include_affixes));
768 set_errno(addrlist, save_errno, message, DEFER, FALSE);
769 retry_add_item(addr, addr->address_retry_key, 0);
770 update_waiting = FALSE;
774 /* Handle other errors in obtaining an SMTP response by returning -1. This
775 will cause all the addresses to be deferred. Restore the SMTP command in
776 big_buffer for which we are checking the response, so the error message
779 else if (errno != 0 || buffer[0] == 0)
781 string_format(big_buffer, big_buffer_size, "RCPT TO:<%s>",
782 transport_rcpt_address(addr, include_affixes));
786 /* Handle SMTP permanent and temporary response codes. */
791 string_sprintf("SMTP error from remote mail server after RCPT TO:<%s>: "
792 "host %s [%s]: %s", transport_rcpt_address(addr, include_affixes),
793 host->name, host->address, string_printing(buffer));
794 setflag(addr, af_pass_message);
795 deliver_msglog("%s %s\n", tod_stamp(tod_log), addr->message);
797 /* The response was 5xx */
799 if (buffer[0] == '5')
801 addr->transport_return = FAIL;
805 /* The response was 4xx */
809 addr->transport_return = DEFER;
810 addr->basic_errno = ERRNO_RCPT4XX;
811 addr->more_errno |= ((buffer[1] - '0')*10 + buffer[2] - '0') << 8;
813 /* Log temporary errors if there are more hosts to be tried. */
815 if (host->next != NULL) log_write(0, LOG_MAIN, "%s", addr->message);
817 /* Do not put this message on the list of those waiting for specific
818 hosts, as otherwise it is likely to be tried too often. */
820 update_waiting = FALSE;
822 /* Add a retry item for the address so that it doesn't get tried again
823 too soon. If address_retry_include_sender is true, add the sender address
826 if (address_retry_include_sender)
828 uschar *altkey = string_sprintf("%s:<%s>", addr->address_retry_key,
830 retry_add_item(addr, altkey, 0);
832 else retry_add_item(addr, addr->address_retry_key, 0);
835 } /* Loop for next RCPT response */
837 /* Update where to start at for the next block of responses, unless we
838 have already handled all the addresses. */
840 if (addr != NULL) *sync_addr = addr->next;
842 /* Handle a response to DATA. If we have not had any good recipients, either
843 previously or in this block, the response is ignored. */
845 if (pending_DATA != 0 &&
846 !smtp_read_response(inblock, buffer, buffsize, '3', timeout))
851 if (pending_DATA > 0 || (yield & 1) != 0)
853 if (errno == 0 && buffer[0] == '4')
855 errno = ERRNO_DATA4XX;
856 addrlist->more_errno |= ((buffer[1] - '0')*10 + buffer[2] - '0') << 8;
860 (void)check_response(host, &errno, 0, buffer, &code, &msg, &pass_message);
861 DEBUG(D_transport) debug_printf("%s\nerror for DATA ignored: pipelining "
862 "is in use and there were no good recipients\n", msg);
865 /* All responses read and handled; MAIL (if present) received 2xx and DATA (if
866 present) received 3xx. If any RCPTs were handled and yielded anything other
867 than 4xx, yield will be set non-zero. */
874 /* Do the client side of smtp-level authentication */
877 buffer EHLO response from server (gets overwritten)
878 addrlist chain of potential addresses to deliver
879 host host to deliver to
881 ibp, obp comms channel control blocks
884 OK Success, or failed (but not required): global "smtp_authenticated" set
885 DEFER Failed authentication (and was required)
886 ERROR Internal problem
888 FAIL_SEND Failed communications - transmit
893 smtp_auth(uschar *buffer, unsigned bufsize, address_item *addrlist, host_item *host,
894 smtp_transport_options_block *ob, BOOL is_esmtp,
895 smtp_inblock *ibp, smtp_outblock *obp)
898 uschar *fail_reason = US"server did not advertise AUTH support";
900 smtp_authenticated = FALSE;
901 client_authenticator = client_authenticated_id = client_authenticated_sender = NULL;
902 require_auth = verify_check_this_host(&(ob->hosts_require_auth), NULL,
903 host->name, host->address, NULL);
905 if (is_esmtp && !regex_AUTH) regex_AUTH =
906 regex_must_compile(US"\\n250[\\s\\-]AUTH\\s+([\\-\\w\\s]+)(?:\\n|$)",
909 if (is_esmtp && regex_match_and_setup(regex_AUTH, buffer, 0, -1))
911 uschar *names = string_copyn(expand_nstring[1], expand_nlength[1]);
912 expand_nmax = -1; /* reset */
914 /* Must not do this check until after we have saved the result of the
915 regex match above. */
917 if (require_auth == OK ||
918 verify_check_this_host(&(ob->hosts_try_auth), NULL, host->name,
919 host->address, NULL) == OK)
922 fail_reason = US"no common mechanisms were found";
924 DEBUG(D_transport) debug_printf("scanning authentication mechanisms\n");
926 /* Scan the configured authenticators looking for one which is configured
927 for use as a client, which is not suppressed by client_condition, and
928 whose name matches an authentication mechanism supported by the server.
929 If one is found, attempt to authenticate by calling its client function.
932 for (au = auths; !smtp_authenticated && au != NULL; au = au->next)
936 (au->client_condition != NULL &&
937 !expand_check_condition(au->client_condition, au->name,
938 US"client authenticator")))
940 DEBUG(D_transport) debug_printf("skipping %s authenticator: %s\n",
942 (au->client)? "client_condition is false" :
943 "not configured as a client");
947 /* Loop to scan supported server mechanisms */
952 int len = Ustrlen(au->public_name);
953 while (isspace(*p)) p++;
955 if (strncmpic(au->public_name, p, len) != 0 ||
956 (p[len] != 0 && !isspace(p[len])))
958 while (*p != 0 && !isspace(*p)) p++;
962 /* Found data for a listed mechanism. Call its client entry. Set
963 a flag in the outblock so that data is overwritten after sending so
964 that reflections don't show it. */
966 fail_reason = US"authentication attempt(s) failed";
967 obp->authenticating = TRUE;
968 rc = (au->info->clientcode)(au, ibp, obp,
969 ob->command_timeout, buffer, bufsize);
970 obp->authenticating = FALSE;
971 DEBUG(D_transport) debug_printf("%s authenticator yielded %d\n",
974 /* A temporary authentication failure must hold up delivery to
975 this host. After a permanent authentication failure, we carry on
976 to try other authentication methods. If all fail hard, try to
977 deliver the message unauthenticated unless require_auth was set. */
982 smtp_authenticated = TRUE; /* stops the outer loop */
983 client_authenticator = au->name;
984 if (au->set_client_id != NULL)
985 client_authenticated_id = expand_string(au->set_client_id);
988 /* Failure after writing a command */
993 /* Failure after reading a response */
996 if (errno != 0 || buffer[0] != '5') return FAIL;
997 log_write(0, LOG_MAIN, "%s authenticator failed H=%s [%s] %s",
998 au->name, host->name, host->address, buffer);
1001 /* Failure by some other means. In effect, the authenticator
1002 decided it wasn't prepared to handle this case. Typically this
1003 is the result of "fail" in an expansion string. Do we need to
1004 log anything here? Feb 2006: a message is now put in the buffer
1005 if logging is required. */
1009 log_write(0, LOG_MAIN, "%s authenticator cancelled "
1010 "authentication H=%s [%s] %s", au->name, host->name,
1011 host->address, buffer);
1014 /* Internal problem, message in buffer. */
1017 set_errno(addrlist, 0, string_copy(buffer), DEFER, FALSE);
1021 break; /* If not authenticated, try next authenticator */
1022 } /* Loop for scanning supported server mechanisms */
1023 } /* Loop for further authenticators */
1027 /* If we haven't authenticated, but are required to, give up. */
1029 if (require_auth == OK && !smtp_authenticated)
1031 set_errno(addrlist, ERRNO_AUTHFAIL,
1032 string_sprintf("authentication required but %s", fail_reason), DEFER,
1041 /* Construct AUTH appendix string for MAIL TO */
1044 buffer to build string
1045 addrlist chain of potential addresses to deliver
1046 ob transport options
1048 Globals smtp_authenticated
1049 client_authenticated_sender
1050 Return True on error, otherwise buffer has (possibly empty) terminated string
1054 smtp_mail_auth_str(uschar *buffer, unsigned bufsize, address_item *addrlist,
1055 smtp_transport_options_block *ob)
1057 uschar *local_authenticated_sender = authenticated_sender;
1060 debug_printf("smtp_mail_auth_str: as<%s> os<%s> SA<%s>\n", authenticated_sender, ob->authenticated_sender, smtp_authenticated?"Y":"N");
1063 if (ob->authenticated_sender != NULL)
1065 uschar *new = expand_string(ob->authenticated_sender);
1068 if (!expand_string_forcedfail)
1070 uschar *message = string_sprintf("failed to expand "
1071 "authenticated_sender: %s", expand_string_message);
1072 set_errno(addrlist, 0, message, DEFER, FALSE);
1076 else if (new[0] != 0) local_authenticated_sender = new;
1079 /* Add the authenticated sender address if present */
1081 if ((smtp_authenticated || ob->authenticated_sender_force) &&
1082 local_authenticated_sender != NULL)
1084 string_format(buffer, bufsize, " AUTH=%s",
1085 auth_xtextencode(local_authenticated_sender,
1086 Ustrlen(local_authenticated_sender)));
1087 client_authenticated_sender = string_copy(local_authenticated_sender);
1097 /*************************************************
1098 * Deliver address list to given host *
1099 *************************************************/
1101 /* If continue_hostname is not null, we get here only when continuing to
1102 deliver down an existing channel. The channel was passed as the standard
1103 input. TLS is never active on a passed channel; the previous process always
1104 closes it down before passing the connection on.
1106 Otherwise, we have to make a connection to the remote host, and do the
1107 initial protocol exchange.
1109 When running as an MUA wrapper, if the sender or any recipient is rejected,
1110 temporarily or permanently, we force failure for all recipients.
1113 addrlist chain of potential addresses to deliver; only those whose
1114 transport_return field is set to PENDING_DEFER are currently
1115 being processed; others should be skipped - they have either
1116 been delivered to an earlier host or IP address, or been
1117 failed by one of them.
1118 host host to deliver to
1119 host_af AF_INET or AF_INET6
1120 port default TCP/IP port to use, in host byte order
1121 interface interface to bind to, or NULL
1122 tblock transport instance block
1123 copy_host TRUE if host set in addr->host_used must be copied, because
1124 it is specific to this call of the transport
1125 message_defer set TRUE if yield is OK, but all addresses were deferred
1126 because of a non-recipient, non-host failure, that is, a
1127 4xx response to MAIL FROM, DATA, or ".". This is a defer
1128 that is specific to the message.
1129 suppress_tls if TRUE, don't attempt a TLS connection - this is set for
1130 a second attempt after TLS initialization fails
1132 Returns: OK - the connection was made and the delivery attempted;
1133 the result for each address is in its data block.
1134 DEFER - the connection could not be made, or something failed
1135 while setting up the SMTP session, or there was a
1136 non-message-specific error, such as a timeout.
1137 ERROR - a filter command is specified for this transport,
1138 and there was a problem setting it up; OR helo_data
1139 or add_headers or authenticated_sender is specified
1140 for this transport, and the string failed to expand
1144 smtp_deliver(address_item *addrlist, host_item *host, int host_af, int port,
1145 uschar *interface, transport_instance *tblock, BOOL copy_host,
1146 BOOL *message_defer, BOOL suppress_tls)
1149 address_item *sync_addr;
1150 address_item *first_addr = addrlist;
1155 time_t start_delivery_time = time(NULL);
1156 smtp_transport_options_block *ob =
1157 (smtp_transport_options_block *)(tblock->options_block);
1158 BOOL lmtp = strcmpic(ob->protocol, US"lmtp") == 0;
1159 BOOL smtps = strcmpic(ob->protocol, US"smtps") == 0;
1161 BOOL send_rset = TRUE;
1162 BOOL send_quit = TRUE;
1163 BOOL setting_up = TRUE;
1164 BOOL completed_address = FALSE;
1167 BOOL pass_message = FALSE;
1168 #ifdef EXPERIMENTAL_PRDR
1169 BOOL prdr_offered = FALSE;
1172 smtp_inblock inblock;
1173 smtp_outblock outblock;
1174 int max_rcpt = tblock->max_addresses;
1175 uschar *igquotstr = US"";
1176 uschar *helo_data = NULL;
1177 uschar *message = NULL;
1178 uschar new_message_id[MESSAGE_ID_LENGTH + 1];
1180 uschar buffer[4096];
1181 uschar inbuffer[4096];
1182 uschar outbuffer[1024];
1184 suppress_tls = suppress_tls; /* stop compiler warning when no TLS support */
1186 *message_defer = FALSE;
1187 smtp_command = US"initial connection";
1188 if (max_rcpt == 0) max_rcpt = 999999;
1190 /* Set up the buffer for reading SMTP response packets. */
1192 inblock.buffer = inbuffer;
1193 inblock.buffersize = sizeof(inbuffer);
1194 inblock.ptr = inbuffer;
1195 inblock.ptrend = inbuffer;
1197 /* Set up the buffer for holding SMTP commands while pipelining */
1199 outblock.buffer = outbuffer;
1200 outblock.buffersize = sizeof(outbuffer);
1201 outblock.ptr = outbuffer;
1202 outblock.cmd_count = 0;
1203 outblock.authenticating = FALSE;
1205 /* Reset the parameters of a TLS session. */
1208 tls_in.cipher = NULL; /* for back-compatible behaviour */
1209 tls_in.peerdn = NULL;
1210 #if defined(SUPPORT_TLS) && !defined(USE_GNUTLS)
1215 tls_out.cipher = NULL; /* the one we may use for this transport */
1216 tls_out.peerdn = NULL;
1217 #if defined(SUPPORT_TLS) && !defined(USE_GNUTLS)
1224 set_errno(addrlist, 0, US"TLS support not available", DEFER, FALSE);
1229 /* Make a connection to the host if this isn't a continued delivery, and handle
1230 the initial interaction and HELO/EHLO/LHLO. Connect timeout errors are handled
1231 specially so they can be identified for retries. */
1233 if (continue_hostname == NULL)
1235 inblock.sock = outblock.sock =
1236 smtp_connect(host, host_af, port, interface, ob->connect_timeout,
1237 ob->keepalive, ob->dscp); /* This puts port into host->port */
1239 if (inblock.sock < 0)
1241 set_errno(addrlist, (errno == ETIMEDOUT)? ERRNO_CONNECTTIMEOUT : errno,
1242 NULL, DEFER, FALSE);
1246 /* Expand the greeting message while waiting for the initial response. (Makes
1247 sense if helo_data contains ${lookup dnsdb ...} stuff). The expansion is
1248 delayed till here so that $sending_interface and $sending_port are set. */
1250 helo_data = expand_string(ob->helo_data);
1252 /* The first thing is to wait for an initial OK response. The dreaded "goto"
1253 is nevertheless a reasonably clean way of programming this kind of logic,
1254 where you want to escape on any error. */
1258 if (!smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
1259 ob->command_timeout)) goto RESPONSE_FAILED;
1261 /* Now check if the helo_data expansion went well, and sign off cleanly if
1264 if (helo_data == NULL)
1266 uschar *message = string_sprintf("failed to expand helo_data: %s",
1267 expand_string_message);
1268 set_errno(addrlist, 0, message, DEFER, FALSE);
1274 /** Debugging without sending a message
1275 addrlist->transport_return = DEFER;
1279 /* Errors that occur after this point follow an SMTP command, which is
1280 left in big_buffer by smtp_write_command() for use in error messages. */
1282 smtp_command = big_buffer;
1284 /* Tell the remote who we are...
1286 February 1998: A convention has evolved that ESMTP-speaking MTAs include the
1287 string "ESMTP" in their greeting lines, so make Exim send EHLO if the
1288 greeting is of this form. The assumption was that the far end supports it
1289 properly... but experience shows that there are some that give 5xx responses,
1290 even though the banner includes "ESMTP" (there's a bloody-minded one that
1291 says "ESMTP not spoken here"). Cope with that case.
1293 September 2000: Time has passed, and it seems reasonable now to always send
1294 EHLO at the start. It is also convenient to make the change while installing
1297 July 2003: Joachim Wieland met a broken server that advertises "PIPELINING"
1298 but times out after sending MAIL FROM, RCPT TO and DATA all together. There
1299 would be no way to send out the mails, so there is now a host list
1300 "hosts_avoid_esmtp" that disables ESMTP for special hosts and solves the
1301 PIPELINING problem as well. Maybe it can also be useful to cure other
1302 problems with broken servers.
1304 Exim originally sent "Helo" at this point and ran for nearly a year that way.
1305 Then somebody tried it with a Microsoft mailer... It seems that all other
1306 mailers use upper case for some reason (the RFC is quite clear about case
1307 independence) so, for peace of mind, I gave in. */
1309 esmtp = verify_check_this_host(&(ob->hosts_avoid_esmtp), NULL,
1310 host->name, host->address, NULL) != OK;
1312 /* Alas; be careful, since this goto is not an error-out, so conceivably
1313 we might set data between here and the target which we assume to exist
1314 and be usable. I can see this coming back to bite us. */
1319 suppress_tls = FALSE;
1320 ob->tls_tempfail_tryclear = FALSE;
1321 smtp_command = US"SSL-on-connect";
1328 if (smtp_write_command(&outblock, FALSE, "%s %s\r\n",
1329 lmtp? "LHLO" : "EHLO", helo_data) < 0)
1331 if (!smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
1332 ob->command_timeout))
1334 if (errno != 0 || buffer[0] == 0 || lmtp) goto RESPONSE_FAILED;
1341 debug_printf("not sending EHLO (host matches hosts_avoid_esmtp)\n");
1346 if (smtp_write_command(&outblock, FALSE, "HELO %s\r\n", helo_data) < 0)
1348 if (!smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
1349 ob->command_timeout)) goto RESPONSE_FAILED;
1352 /* Set IGNOREQUOTA if the response to LHLO specifies support and the
1353 lmtp_ignore_quota option was set. */
1355 igquotstr = (lmtp && ob->lmtp_ignore_quota &&
1356 pcre_exec(regex_IGNOREQUOTA, NULL, CS buffer, Ustrlen(CS buffer), 0,
1357 PCRE_EOPT, NULL, 0) >= 0)? US" IGNOREQUOTA" : US"";
1359 /* Set tls_offered if the response to EHLO specifies support for STARTTLS. */
1362 tls_offered = esmtp &&
1363 pcre_exec(regex_STARTTLS, NULL, CS buffer, Ustrlen(buffer), 0,
1364 PCRE_EOPT, NULL, 0) >= 0;
1367 #ifdef EXPERIMENTAL_PRDR
1368 prdr_offered = esmtp &&
1369 (pcre_exec(regex_PRDR, NULL, CS buffer, Ustrlen(buffer), 0,
1370 PCRE_EOPT, NULL, 0) >= 0) &&
1371 (verify_check_this_host(&(ob->hosts_try_prdr), NULL, host->name,
1372 host->address, NULL) == OK);
1375 {DEBUG(D_transport) debug_printf("PRDR usable\n");}
1379 /* For continuing deliveries down the same channel, the socket is the standard
1380 input, and we don't need to redo EHLO here (but may need to do so for TLS - see
1381 below). Set up the pointer to where subsequent commands will be left, for
1382 error messages. Note that smtp_use_size and smtp_use_pipelining will have been
1383 set from the command line if they were set in the process that passed the
1388 inblock.sock = outblock.sock = fileno(stdin);
1389 smtp_command = big_buffer;
1390 host->port = port; /* Record the port that was used */
1393 /* If TLS is available on this connection, whether continued or not, attempt to
1394 start up a TLS session, unless the host is in hosts_avoid_tls. If successful,
1395 send another EHLO - the server may give a different answer in secure mode. We
1396 use a separate buffer for reading the response to STARTTLS so that if it is
1397 negative, the original EHLO data is available for subsequent analysis, should
1398 the client not be required to use TLS. If the response is bad, copy the buffer
1399 for error analysis. */
1402 if (tls_offered && !suppress_tls &&
1403 verify_check_this_host(&(ob->hosts_avoid_tls), NULL, host->name,
1404 host->address, NULL) != OK)
1406 uschar buffer2[4096];
1407 if (smtp_write_command(&outblock, FALSE, "STARTTLS\r\n") < 0)
1410 /* If there is an I/O error, transmission of this message is deferred. If
1411 there is a temporary rejection of STARRTLS and tls_tempfail_tryclear is
1412 false, we also defer. However, if there is a temporary rejection of STARTTLS
1413 and tls_tempfail_tryclear is true, or if there is an outright rejection of
1414 STARTTLS, we carry on. This means we will try to send the message in clear,
1415 unless the host is in hosts_require_tls (tested below). */
1417 if (!smtp_read_response(&inblock, buffer2, sizeof(buffer2), '2',
1418 ob->command_timeout))
1420 if (errno != 0 || buffer2[0] == 0 ||
1421 (buffer2[0] == '4' && !ob->tls_tempfail_tryclear))
1423 Ustrncpy(buffer, buffer2, sizeof(buffer));
1424 goto RESPONSE_FAILED;
1428 /* STARTTLS accepted: try to negotiate a TLS session. */
1433 int rc = tls_client_start(inblock.sock,
1436 ob->tls_certificate,
1439 ob->tls_verify_certificates,
1441 ob->tls_require_ciphers,
1442 #ifdef EXPERIMENTAL_OCSP
1443 ob->hosts_require_ocsp,
1445 ob->tls_dh_min_bits,
1446 ob->command_timeout);
1448 /* TLS negotiation failed; give an error. From outside, this function may
1449 be called again to try in clear on a new connection, if the options permit
1450 it for this host. */
1454 save_errno = ERRNO_TLSFAILURE;
1455 message = US"failure while setting up TLS session";
1460 /* TLS session is set up */
1462 for (addr = addrlist; addr != NULL; addr = addr->next)
1464 if (addr->transport_return == PENDING_DEFER)
1466 addr->cipher = tls_out.cipher;
1467 addr->peerdn = tls_out.peerdn;
1473 /* if smtps, we'll have smtp_command set to something else; always safe to
1475 smtp_command = big_buffer;
1477 /* If we started TLS, redo the EHLO/LHLO exchange over the secure channel. If
1478 helo_data is null, we are dealing with a connection that was passed from
1479 another process, and so we won't have expanded helo_data above. We have to
1480 expand it here. $sending_ip_address and $sending_port are set up right at the
1481 start of the Exim process (in exim.c). */
1483 if (tls_out.active >= 0)
1486 if (helo_data == NULL)
1488 helo_data = expand_string(ob->helo_data);
1489 if (helo_data == NULL)
1491 uschar *message = string_sprintf("failed to expand helo_data: %s",
1492 expand_string_message);
1493 set_errno(addrlist, 0, message, DEFER, FALSE);
1499 /* For SMTPS we need to wait for the initial OK response. */
1502 if (!smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
1503 ob->command_timeout)) goto RESPONSE_FAILED;
1507 greeting_cmd = "EHLO";
1510 greeting_cmd = "HELO";
1512 debug_printf("not sending EHLO (host matches hosts_avoid_esmtp)\n");
1515 if (smtp_write_command(&outblock, FALSE, "%s %s\r\n",
1516 lmtp? "LHLO" : greeting_cmd, helo_data) < 0)
1518 if (!smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
1519 ob->command_timeout))
1520 goto RESPONSE_FAILED;
1523 /* If the host is required to use a secure channel, ensure that we
1526 else if (verify_check_this_host(&(ob->hosts_require_tls), NULL, host->name,
1527 host->address, NULL) == OK)
1529 save_errno = ERRNO_TLSREQUIRED;
1530 message = string_sprintf("a TLS session is required for %s [%s], but %s",
1531 host->name, host->address,
1532 tls_offered? "an attempt to start TLS failed" :
1533 "the server did not offer TLS support");
1538 /* If TLS is active, we have just started it up and re-done the EHLO command,
1539 so its response needs to be analyzed. If TLS is not active and this is a
1540 continued session down a previously-used socket, we haven't just done EHLO, so
1543 if (continue_hostname == NULL
1545 || tls_out.active >= 0
1549 /* Set for IGNOREQUOTA if the response to LHLO specifies support and the
1550 lmtp_ignore_quota option was set. */
1552 igquotstr = (lmtp && ob->lmtp_ignore_quota &&
1553 pcre_exec(regex_IGNOREQUOTA, NULL, CS buffer, Ustrlen(CS buffer), 0,
1554 PCRE_EOPT, NULL, 0) >= 0)? US" IGNOREQUOTA" : US"";
1556 /* If the response to EHLO specified support for the SIZE parameter, note
1557 this, provided size_addition is non-negative. */
1559 smtp_use_size = esmtp && ob->size_addition >= 0 &&
1560 pcre_exec(regex_SIZE, NULL, CS buffer, Ustrlen(CS buffer), 0,
1561 PCRE_EOPT, NULL, 0) >= 0;
1563 /* Note whether the server supports PIPELINING. If hosts_avoid_esmtp matched
1564 the current host, esmtp will be false, so PIPELINING can never be used. If
1565 the current host matches hosts_avoid_pipelining, don't do it. */
1567 smtp_use_pipelining = esmtp &&
1568 verify_check_this_host(&(ob->hosts_avoid_pipelining), NULL, host->name,
1569 host->address, NULL) != OK &&
1570 pcre_exec(regex_PIPELINING, NULL, CS buffer, Ustrlen(CS buffer), 0,
1571 PCRE_EOPT, NULL, 0) >= 0;
1573 DEBUG(D_transport) debug_printf("%susing PIPELINING\n",
1574 smtp_use_pipelining? "" : "not ");
1576 #ifdef EXPERIMENTAL_PRDR
1577 prdr_offered = esmtp &&
1578 pcre_exec(regex_PRDR, NULL, CS buffer, Ustrlen(CS buffer), 0,
1579 PCRE_EOPT, NULL, 0) >= 0 &&
1580 verify_check_this_host(&(ob->hosts_try_prdr), NULL, host->name,
1581 host->address, NULL) == OK;
1584 {DEBUG(D_transport) debug_printf("PRDR usable\n");}
1587 /* Note if the response to EHLO specifies support for the AUTH extension.
1588 If it has, check that this host is one we want to authenticate to, and do
1589 the business. The host name and address must be available when the
1590 authenticator's client driver is running. */
1592 switch (yield = smtp_auth(buffer, sizeof(buffer), addrlist, host,
1593 ob, esmtp, &inblock, &outblock))
1595 default: goto SEND_QUIT;
1597 case FAIL_SEND: goto SEND_FAILED;
1598 case FAIL: goto RESPONSE_FAILED;
1602 /* The setting up of the SMTP call is now complete. Any subsequent errors are
1603 message-specific. */
1607 /* If there is a filter command specified for this transport, we can now
1608 set it up. This cannot be done until the identify of the host is known. */
1610 if (tblock->filter_command != NULL)
1614 sprintf(CS buffer, "%.50s transport", tblock->name);
1615 rc = transport_set_up_command(&transport_filter_argv, tblock->filter_command,
1616 TRUE, DEFER, addrlist, buffer, NULL);
1617 transport_filter_timeout = tblock->filter_timeout;
1619 /* On failure, copy the error to all addresses, abandon the SMTP call, and
1624 set_errno(addrlist->next, addrlist->basic_errno, addrlist->message, DEFER,
1632 /* For messages that have more than the maximum number of envelope recipients,
1633 we want to send several transactions down the same SMTP connection. (See
1634 comments in deliver.c as to how this reconciles, heuristically, with
1635 remote_max_parallel.) This optimization was added to Exim after the following
1636 code was already working. The simplest way to put it in without disturbing the
1637 code was to use a goto to jump back to this point when there is another
1638 transaction to handle. */
1641 sync_addr = first_addr;
1645 completed_address = FALSE;
1648 /* Initiate a message transfer. If we know the receiving MTA supports the SIZE
1649 qualification, send it, adding something to the message size to allow for
1650 imprecision and things that get added en route. Exim keeps the number of lines
1651 in a message, so we can give an accurate value for the original message, but we
1652 need some additional to handle added headers. (Double "." characters don't get
1653 included in the count.) */
1660 sprintf(CS p, " SIZE=%d", message_size+message_linecount+ob->size_addition);
1664 #ifdef EXPERIMENTAL_PRDR
1665 prdr_active = FALSE;
1668 for (addr = first_addr; addr; addr = addr->next)
1669 if (addr->transport_return == PENDING_DEFER)
1671 for (addr = addr->next; addr; addr = addr->next)
1672 if (addr->transport_return == PENDING_DEFER)
1673 { /* at least two recipients to send */
1675 sprintf(CS p, " PRDR"); p += 5;
1676 goto prdr_is_active;
1684 /* If an authenticated_sender override has been specified for this transport
1685 instance, expand it. If the expansion is forced to fail, and there was already
1686 an authenticated_sender for this message, the original value will be used.
1687 Other expansion failures are serious. An empty result is ignored, but there is
1688 otherwise no check - this feature is expected to be used with LMTP and other
1689 cases where non-standard addresses (e.g. without domains) might be required. */
1691 if (smtp_mail_auth_str(p, sizeof(buffer) - (p-buffer), addrlist, ob))
1694 /* From here until we send the DATA command, we can make use of PIPELINING
1695 if the server host supports it. The code has to be able to check the responses
1696 at any point, for when the buffer fills up, so we write it totally generally.
1697 When PIPELINING is off, each command written reports that it has flushed the
1700 pending_MAIL = TRUE; /* The block starts with MAIL */
1702 rc = smtp_write_command(&outblock, smtp_use_pipelining,
1703 "MAIL FROM:<%s>%s\r\n", return_path, buffer);
1704 mail_command = string_copy(big_buffer); /* Save for later error message */
1708 case -1: /* Transmission error */
1711 case +1: /* Block was sent */
1712 if (!smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
1713 ob->command_timeout))
1715 if (errno == 0 && buffer[0] == '4')
1717 errno = ERRNO_MAIL4XX;
1718 addrlist->more_errno |= ((buffer[1] - '0')*10 + buffer[2] - '0') << 8;
1720 goto RESPONSE_FAILED;
1722 pending_MAIL = FALSE;
1726 /* Pass over all the relevant recipient addresses for this host, which are the
1727 ones that have status PENDING_DEFER. If we are using PIPELINING, we can send
1728 several before we have to read the responses for those seen so far. This
1729 checking is done by a subroutine because it also needs to be done at the end.
1730 Send only up to max_rcpt addresses at a time, leaving first_addr pointing to
1731 the next one if not all are sent.
1733 In the MUA wrapper situation, we want to flush the PIPELINING buffer for the
1734 last address because we want to abort if any recipients have any kind of
1735 problem, temporary or permanent. We know that all recipient addresses will have
1736 the PENDING_DEFER status, because only one attempt is ever made, and we know
1737 that max_rcpt will be large, so all addresses will be done at once. */
1739 for (addr = first_addr;
1740 address_count < max_rcpt && addr != NULL;
1746 if (addr->transport_return != PENDING_DEFER) continue;
1749 no_flush = smtp_use_pipelining && (!mua_wrapper || addr->next != NULL);
1751 /* Now send the RCPT command, and process outstanding responses when
1752 necessary. After a timeout on RCPT, we just end the function, leaving the
1753 yield as OK, because this error can often mean that there is a problem with
1754 just one address, so we don't want to delay the host. */
1756 count = smtp_write_command(&outblock, no_flush, "RCPT TO:<%s>%s\r\n",
1757 transport_rcpt_address(addr, tblock->rcpt_include_affixes), igquotstr);
1758 if (count < 0) goto SEND_FAILED;
1761 switch(sync_responses(first_addr, tblock->rcpt_include_affixes,
1762 &sync_addr, host, count, ob->address_retry_include_sender,
1763 pending_MAIL, 0, &inblock, ob->command_timeout, buffer,
1766 case 3: ok = TRUE; /* 2xx & 5xx => OK & progress made */
1767 case 2: completed_address = TRUE; /* 5xx (only) => progress made */
1770 case 1: ok = TRUE; /* 2xx (only) => OK, but if LMTP, */
1771 if (!lmtp) completed_address = TRUE; /* can't tell about progress yet */
1772 case 0: /* No 2xx or 5xx, but no probs */
1775 case -1: goto END_OFF; /* Timeout on RCPT */
1776 default: goto RESPONSE_FAILED; /* I/O error, or any MAIL error */
1778 pending_MAIL = FALSE; /* Dealt with MAIL */
1780 } /* Loop for next address */
1782 /* If we are an MUA wrapper, abort if any RCPTs were rejected, either
1783 permanently or temporarily. We should have flushed and synced after the last
1788 address_item *badaddr;
1789 for (badaddr = first_addr; badaddr != NULL; badaddr = badaddr->next)
1791 if (badaddr->transport_return != PENDING_OK) break;
1793 if (badaddr != NULL)
1795 set_errno(addrlist, 0, badaddr->message, FAIL,
1796 testflag(badaddr, af_pass_message));
1801 /* If ok is TRUE, we know we have got at least one good recipient, and must now
1802 send DATA, but if it is FALSE (in the normal, non-wrapper case), we may still
1803 have a good recipient buffered up if we are pipelining. We don't want to waste
1804 time sending DATA needlessly, so we only send it if either ok is TRUE or if we
1805 are pipelining. The responses are all handled by sync_responses(). */
1807 if (ok || (smtp_use_pipelining && !mua_wrapper))
1809 int count = smtp_write_command(&outblock, FALSE, "DATA\r\n");
1810 if (count < 0) goto SEND_FAILED;
1811 switch(sync_responses(first_addr, tblock->rcpt_include_affixes, &sync_addr,
1812 host, count, ob->address_retry_include_sender, pending_MAIL,
1813 ok? +1 : -1, &inblock, ob->command_timeout, buffer, sizeof(buffer)))
1815 case 3: ok = TRUE; /* 2xx & 5xx => OK & progress made */
1816 case 2: completed_address = TRUE; /* 5xx (only) => progress made */
1819 case 1: ok = TRUE; /* 2xx (only) => OK, but if LMTP, */
1820 if (!lmtp) completed_address = TRUE; /* can't tell about progress yet */
1821 case 0: break; /* No 2xx or 5xx, but no probs */
1823 case -1: goto END_OFF; /* Timeout on RCPT */
1824 default: goto RESPONSE_FAILED; /* I/O error, or any MAIL/DATA error */
1828 /* Save the first address of the next batch. */
1832 /* If there were no good recipients (but otherwise there have been no
1833 problems), just set ok TRUE, since we have handled address-specific errors
1834 already. Otherwise, it's OK to send the message. Use the check/escape mechanism
1835 for handling the SMTP dot-handling protocol, flagging to apply to headers as
1836 well as body. Set the appropriate timeout value to be used for each chunk.
1837 (Haven't been able to make it work using select() for writing yet.) */
1839 if (!ok) ok = TRUE; else
1841 sigalrm_seen = FALSE;
1842 transport_write_timeout = ob->data_timeout;
1843 smtp_command = US"sending data block"; /* For error messages */
1844 DEBUG(D_transport|D_v)
1845 debug_printf(" SMTP>> writing message and terminating \".\"\n");
1846 transport_count = 0;
1847 #ifndef DISABLE_DKIM
1848 ok = dkim_transport_write_message(addrlist, inblock.sock,
1849 topt_use_crlf | topt_end_dot | topt_escape_headers |
1850 (tblock->body_only? topt_no_headers : 0) |
1851 (tblock->headers_only? topt_no_body : 0) |
1852 (tblock->return_path_add? topt_add_return_path : 0) |
1853 (tblock->delivery_date_add? topt_add_delivery_date : 0) |
1854 (tblock->envelope_to_add? topt_add_envelope_to : 0),
1855 0, /* No size limit */
1856 tblock->add_headers, tblock->remove_headers,
1857 US".", US"..", /* Escaping strings */
1858 tblock->rewrite_rules, tblock->rewrite_existflags,
1859 ob->dkim_private_key, ob->dkim_domain, ob->dkim_selector,
1860 ob->dkim_canon, ob->dkim_strict, ob->dkim_sign_headers
1863 ok = transport_write_message(addrlist, inblock.sock,
1864 topt_use_crlf | topt_end_dot | topt_escape_headers |
1865 (tblock->body_only? topt_no_headers : 0) |
1866 (tblock->headers_only? topt_no_body : 0) |
1867 (tblock->return_path_add? topt_add_return_path : 0) |
1868 (tblock->delivery_date_add? topt_add_delivery_date : 0) |
1869 (tblock->envelope_to_add? topt_add_envelope_to : 0),
1870 0, /* No size limit */
1871 tblock->add_headers, tblock->remove_headers,
1872 US".", US"..", /* Escaping strings */
1873 tblock->rewrite_rules, tblock->rewrite_existflags);
1876 /* transport_write_message() uses write() because it is called from other
1877 places to write to non-sockets. This means that under some OS (e.g. Solaris)
1878 it can exit with "Broken pipe" as its error. This really means that the
1879 socket got closed at the far end. */
1881 transport_write_timeout = 0; /* for subsequent transports */
1883 /* Failure can either be some kind of I/O disaster (including timeout),
1884 or the failure of a transport filter or the expansion of added headers. */
1888 buffer[0] = 0; /* There hasn't been a response */
1889 goto RESPONSE_FAILED;
1892 /* We used to send the terminating "." explicitly here, but because of
1893 buffering effects at both ends of TCP/IP connections, you don't gain
1894 anything by keeping it separate, so it might as well go in the final
1895 data buffer for efficiency. This is now done by setting the topt_end_dot
1898 smtp_command = US"end of data";
1900 #ifdef EXPERIMENTAL_PRDR
1901 /* For PRDR we optionally get a partial-responses warning
1902 * followed by the individual responses, before going on with
1903 * the overall response. If we don't get the warning then deal
1904 * with per non-PRDR. */
1907 ok = smtp_read_response(&inblock, buffer, sizeof(buffer), '3',
1909 if (!ok && errno == 0)
1912 case '2': prdr_active = FALSE;
1915 case '4': errno = ERRNO_DATA4XX;
1916 addrlist->more_errno |= ((buffer[1] - '0')*10 + buffer[2] - '0') << 8;
1923 /* For non-PRDR SMTP, we now read a single response that applies to the
1924 whole message. If it is OK, then all the addresses have been delivered. */
1928 ok = smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
1930 if (!ok && errno == 0 && buffer[0] == '4')
1932 errno = ERRNO_DATA4XX;
1933 addrlist->more_errno |= ((buffer[1] - '0')*10 + buffer[2] - '0') << 8;
1937 /* For LMTP, we get back a response for every RCPT command that we sent;
1938 some may be accepted and some rejected. For those that get a response, their
1939 status is fixed; any that are accepted have been handed over, even if later
1940 responses crash - at least, that's how I read RFC 2033.
1942 If all went well, mark the recipient addresses as completed, record which
1943 host/IPaddress they were delivered to, and cut out RSET when sending another
1944 message down the same channel. Write the completed addresses to the journal
1945 now so that they are recorded in case there is a crash of hardware or
1946 software before the spool gets updated. Also record the final SMTP
1947 confirmation if needed (for SMTP only). */
1952 int delivery_time = (int)(time(NULL) - start_delivery_time);
1955 uschar *conf = NULL;
1958 /* Make a copy of the host if it is local to this invocation
1959 of the transport. */
1963 thost = store_get(sizeof(host_item));
1965 thost->name = string_copy(host->name);
1966 thost->address = string_copy(host->address);
1970 /* Set up confirmation if needed - applies only to SMTP */
1973 #ifndef EXPERIMENTAL_DBL
1974 (log_extra_selector & LX_smtp_confirmation) != 0 &&
1979 uschar *s = string_printing(buffer);
1980 conf = (s == buffer)? (uschar *)string_copy(s) : s;
1983 /* Process all transported addresses - for LMTP or PRDR, read a status for
1986 for (addr = addrlist; addr != first_addr; addr = addr->next)
1988 if (addr->transport_return != PENDING_OK) continue;
1990 /* LMTP - if the response fails badly (e.g. timeout), use it for all the
1991 remaining addresses. Otherwise, it's a return code for just the one
1992 address. For temporary errors, add a retry item for the address so that
1993 it doesn't get tried again too soon. */
1995 #ifdef EXPERIMENTAL_PRDR
1996 if (lmtp || prdr_active)
2001 if (!smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
2004 if (errno != 0 || buffer[0] == 0) goto RESPONSE_FAILED;
2005 addr->message = string_sprintf(
2006 #ifdef EXPERIMENTAL_PRDR
2007 "%s error after %s: %s", prdr_active ? "PRDR":"LMTP",
2009 "LMTP error after %s: %s",
2011 big_buffer, string_printing(buffer));
2012 setflag(addr, af_pass_message); /* Allow message to go to user */
2013 if (buffer[0] == '5')
2014 addr->transport_return = FAIL;
2017 errno = ERRNO_DATA4XX;
2018 addr->more_errno |= ((buffer[1] - '0')*10 + buffer[2] - '0') << 8;
2019 addr->transport_return = DEFER;
2020 #ifdef EXPERIMENTAL_PRDR
2023 retry_add_item(addr, addr->address_retry_key, 0);
2027 completed_address = TRUE; /* NOW we can set this flag */
2028 if ((log_extra_selector & LX_smtp_confirmation) != 0)
2030 uschar *s = string_printing(buffer);
2031 conf = (s == buffer)? (uschar *)string_copy(s) : s;
2035 /* SMTP, or success return from LMTP for this address. Pass back the
2036 actual host that was used. */
2038 addr->transport_return = OK;
2039 addr->more_errno = delivery_time;
2040 addr->host_used = thost;
2041 addr->special_action = flag;
2042 addr->message = conf;
2043 #ifdef EXPERIMENTAL_PRDR
2044 if (prdr_active) addr->flags |= af_prdr_used;
2048 #ifdef EXPERIMENTAL_PRDR
2052 /* Update the journal. For homonymic addresses, use the base address plus
2053 the transport name. See lots of comments in deliver.c about the reasons
2054 for the complications when homonyms are involved. Just carry on after
2055 write error, as it may prove possible to update the spool file later. */
2057 if (testflag(addr, af_homonym))
2058 sprintf(CS buffer, "%.500s/%s\n", addr->unique + 3, tblock->name);
2060 sprintf(CS buffer, "%.500s\n", addr->unique);
2062 DEBUG(D_deliver) debug_printf("journalling %s", buffer);
2063 len = Ustrlen(CS buffer);
2064 if (write(journal_fd, buffer, len) != len)
2065 log_write(0, LOG_MAIN|LOG_PANIC, "failed to write journal for "
2066 "%s: %s", buffer, strerror(errno));
2070 #ifdef EXPERIMENTAL_PRDR
2073 /* PRDR - get the final, overall response. For any non-success
2074 upgrade all the address statuses. */
2075 ok = smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
2079 if(errno == 0 && buffer[0] == '4')
2081 errno = ERRNO_DATA4XX;
2082 addrlist->more_errno |= ((buffer[1] - '0')*10 + buffer[2] - '0') << 8;
2084 for (addr = addrlist; addr != first_addr; addr = addr->next)
2085 if (buffer[0] == '5' || addr->transport_return == OK)
2086 addr->transport_return = PENDING_OK; /* allow set_errno action */
2087 goto RESPONSE_FAILED;
2090 /* Update the journal, or setup retry. */
2091 for (addr = addrlist; addr != first_addr; addr = addr->next)
2092 if (addr->transport_return == OK)
2094 if (testflag(addr, af_homonym))
2095 sprintf(CS buffer, "%.500s/%s\n", addr->unique + 3, tblock->name);
2097 sprintf(CS buffer, "%.500s\n", addr->unique);
2099 DEBUG(D_deliver) debug_printf("journalling(PRDR) %s", buffer);
2100 len = Ustrlen(CS buffer);
2101 if (write(journal_fd, buffer, len) != len)
2102 log_write(0, LOG_MAIN|LOG_PANIC, "failed to write journal for "
2103 "%s: %s", buffer, strerror(errno));
2105 else if (addr->transport_return == DEFER)
2106 retry_add_item(addr, addr->address_retry_key, -2);
2110 /* Ensure the journal file is pushed out to disk. */
2112 if (EXIMfsync(journal_fd) < 0)
2113 log_write(0, LOG_MAIN|LOG_PANIC, "failed to fsync journal: %s",
2119 /* Handle general (not specific to one address) failures here. The value of ok
2120 is used to skip over this code on the falling through case. A timeout causes a
2121 deferral. Other errors may defer or fail according to the response code, and
2122 may set up a special errno value, e.g. after connection chopped, which is
2123 assumed if errno == 0 and there is no text in the buffer. If control reaches
2124 here during the setting up phase (i.e. before MAIL FROM) then always defer, as
2125 the problem is not related to this specific message. */
2134 send_quit = check_response(host, &save_errno, addrlist->more_errno,
2135 buffer, &code, &message, &pass_message);
2141 message = US string_sprintf("send() to %s [%s] failed: %s",
2142 host->name, host->address, strerror(save_errno));
2146 /* This label is jumped to directly when a TLS negotiation has failed,
2147 or was not done for a host for which it is required. Values will be set
2148 in message and save_errno, and setting_up will always be true. Treat as
2149 a temporary error. */
2156 /* If the failure happened while setting up the call, see if the failure was
2157 a 5xx response (this will either be on connection, or following HELO - a 5xx
2158 after EHLO causes it to try HELO). If so, fail all addresses, as this host is
2159 never going to accept them. For other errors during setting up (timeouts or
2160 whatever), defer all addresses, and yield DEFER, so that the host is not
2161 tried again for a while. */
2164 ok = FALSE; /* For when reached by GOTO */
2170 set_errno(addrlist, save_errno, message, FAIL, pass_message);
2174 set_errno(addrlist, save_errno, message, DEFER, pass_message);
2179 /* We want to handle timeouts after MAIL or "." and loss of connection after
2180 "." specially. They can indicate a problem with the sender address or with
2181 the contents of the message rather than a real error on the connection. These
2182 cases are treated in the same way as a 4xx response. This next bit of code
2183 does the classification. */
2194 message_error = TRUE;
2198 message_error = Ustrncmp(smtp_command,"MAIL",4) == 0 ||
2199 Ustrncmp(smtp_command,"end ",4) == 0;
2202 case ERRNO_SMTPCLOSED:
2203 message_error = Ustrncmp(smtp_command,"end ",4) == 0;
2207 message_error = FALSE;
2211 /* Handle the cases that are treated as message errors. These are:
2213 (a) negative response or timeout after MAIL
2214 (b) negative response after DATA
2215 (c) negative response or timeout or dropped connection after "."
2217 It won't be a negative response or timeout after RCPT, as that is dealt
2218 with separately above. The action in all cases is to set an appropriate
2219 error code for all the addresses, but to leave yield set to OK because the
2220 host itself has not failed. Of course, it might in practice have failed
2221 when we've had a timeout, but if so, we'll discover that at the next
2222 delivery attempt. For a temporary error, set the message_defer flag, and
2223 write to the logs for information if this is not the last host. The error
2224 for the last host will be logged as part of the address's log line. */
2228 if (mua_wrapper) code = '5'; /* Force hard failure in wrapper mode */
2229 set_errno(addrlist, save_errno, message, (code == '5')? FAIL : DEFER,
2232 /* If there's an errno, the message contains just the identity of
2235 if (code != '5') /* Anything other than 5 is treated as temporary */
2238 message = US string_sprintf("%s: %s", message, strerror(save_errno));
2239 if (host->next != NULL) log_write(0, LOG_MAIN, "%s", message);
2240 deliver_msglog("%s %s\n", tod_stamp(tod_log), message);
2241 *message_defer = TRUE;
2245 /* Otherwise, we have an I/O error or a timeout other than after MAIL or
2246 ".", or some other transportation error. We defer all addresses and yield
2247 DEFER, except for the case of failed add_headers expansion, or a transport
2248 filter failure, when the yield should be ERROR, to stop it trying other
2253 yield = (save_errno == ERRNO_CHHEADER_FAIL ||
2254 save_errno == ERRNO_FILTER_FAIL)? ERROR : DEFER;
2255 set_errno(addrlist, save_errno, message, DEFER, pass_message);
2261 /* If all has gone well, send_quit will be set TRUE, implying we can end the
2262 SMTP session tidily. However, if there were too many addresses to send in one
2263 message (indicated by first_addr being non-NULL) we want to carry on with the
2264 rest of them. Also, it is desirable to send more than one message down the SMTP
2265 connection if there are several waiting, provided we haven't already sent so
2266 many as to hit the configured limit. The function transport_check_waiting looks
2267 for a waiting message and returns its id. Then transport_pass_socket tries to
2268 set up a continued delivery by passing the socket on to another process. The
2269 variable send_rset is FALSE if a message has just been successfully transfered.
2271 If we are already sending down a continued channel, there may be further
2272 addresses not yet delivered that are aimed at the same host, but which have not
2273 been passed in this run of the transport. In this case, continue_more will be
2274 true, and all we should do is send RSET if necessary, and return, leaving the
2277 However, if no address was disposed of, i.e. all addresses got 4xx errors, we
2278 do not want to continue with other messages down the same channel, because that
2279 can lead to looping between two or more messages, all with the same,
2280 temporarily failing address(es). [The retry information isn't updated yet, so
2281 new processes keep on trying.] We probably also don't want to try more of this
2282 message's addresses either.
2284 If we have started a TLS session, we have to end it before passing the
2285 connection to a new process. However, not all servers can handle this (Exim
2286 can), so we do not pass such a connection on if the host matches
2287 hosts_nopass_tls. */
2290 debug_printf("ok=%d send_quit=%d send_rset=%d continue_more=%d "
2291 "yield=%d first_address is %sNULL\n", ok, send_quit, send_rset,
2292 continue_more, yield, (first_addr == NULL)? "":"not ");
2294 if (completed_address && ok && send_quit)
2297 if (first_addr != NULL || continue_more ||
2299 (tls_out.active < 0 ||
2300 verify_check_this_host(&(ob->hosts_nopass_tls), NULL, host->name,
2301 host->address, NULL) != OK)
2303 transport_check_waiting(tblock->name, host->name,
2304 tblock->connection_max_messages, new_message_id, &more)
2312 if (! (ok = smtp_write_command(&outblock, FALSE, "RSET\r\n") >= 0))
2314 msg = US string_sprintf("send() to %s [%s] failed: %s", host->name,
2315 host->address, strerror(save_errno));
2318 else if (! (ok = smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
2319 ob->command_timeout)))
2322 send_quit = check_response(host, &errno, 0, buffer, &code, &msg,
2326 DEBUG(D_transport) debug_printf("%s\n", msg);
2331 /* Either RSET was not needed, or it succeeded */
2335 if (first_addr != NULL) /* More addresses still to be sent */
2336 { /* in this run of the transport */
2337 continue_sequence++; /* Causes * in logging */
2340 if (continue_more) return yield; /* More addresses for another run */
2342 /* Pass the socket to a new Exim process. Before doing so, we must shut
2343 down TLS. Not all MTAs allow for the continuation of the SMTP session
2344 when TLS is shut down. We test for this by sending a new EHLO. If we
2345 don't get a good response, we don't attempt to pass the socket on. */
2348 if (tls_out.active >= 0)
2350 tls_close(FALSE, TRUE);
2354 ok = smtp_write_command(&outblock,FALSE,"EHLO %s\r\n",helo_data) >= 0 &&
2355 smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
2356 ob->command_timeout);
2360 /* If the socket is successfully passed, we musn't send QUIT (or
2361 indeed anything!) from here. */
2363 if (ok && transport_pass_socket(tblock->name, host->name, host->address,
2364 new_message_id, inblock.sock))
2370 /* If RSET failed and there are addresses left, they get deferred. */
2372 else set_errno(first_addr, errno, msg, DEFER, FALSE);
2376 /* End off tidily with QUIT unless the connection has died or the socket has
2377 been passed to another process. There has been discussion on the net about what
2378 to do after sending QUIT. The wording of the RFC suggests that it is necessary
2379 to wait for a response, but on the other hand, there isn't anything one can do
2380 with an error response, other than log it. Exim used to do that. However,
2381 further discussion suggested that it is positively advantageous not to wait for
2382 the response, but to close the session immediately. This is supposed to move
2383 the TCP/IP TIME_WAIT state from the server to the client, thereby removing some
2384 load from the server. (Hosts that are both servers and clients may not see much
2385 difference, of course.) Further discussion indicated that this was safe to do
2386 on Unix systems which have decent implementations of TCP/IP that leave the
2387 connection around for a while (TIME_WAIT) after the application has gone away.
2388 This enables the response sent by the server to be properly ACKed rather than
2389 timed out, as can happen on broken TCP/IP implementations on other OS.
2391 This change is being made on 31-Jul-98. After over a year of trouble-free
2392 operation, the old commented-out code was removed on 17-Sep-99. */
2395 if (send_quit) (void)smtp_write_command(&outblock, FALSE, "QUIT\r\n");
2400 tls_close(FALSE, TRUE);
2403 /* Close the socket, and return the appropriate value, first setting
2404 continue_transport and continue_hostname NULL to prevent any other addresses
2405 that may include the host from trying to re-use a continuation socket. This
2406 works because the NULL setting is passed back to the calling process, and
2407 remote_max_parallel is forced to 1 when delivering over an existing connection,
2409 If all went well and continue_more is set, we shouldn't actually get here if
2410 there are further addresses, as the return above will be taken. However,
2411 writing RSET might have failed, or there may be other addresses whose hosts are
2412 specified in the transports, and therefore not visible at top level, in which
2413 case continue_more won't get set. */
2415 (void)close(inblock.sock);
2416 continue_transport = NULL;
2417 continue_hostname = NULL;
2424 /*************************************************
2425 * Closedown entry point *
2426 *************************************************/
2428 /* This function is called when exim is passed an open smtp channel
2429 from another incarnation, but the message which it has been asked
2430 to deliver no longer exists. The channel is on stdin.
2432 We might do fancy things like looking for another message to send down
2433 the channel, but if the one we sought has gone, it has probably been
2434 delivered by some other process that itself will seek further messages,
2435 so just close down our connection.
2437 Argument: pointer to the transport instance block
2442 smtp_transport_closedown(transport_instance *tblock)
2444 smtp_transport_options_block *ob =
2445 (smtp_transport_options_block *)(tblock->options_block);
2446 smtp_inblock inblock;
2447 smtp_outblock outblock;
2449 uschar inbuffer[4096];
2450 uschar outbuffer[16];
2452 inblock.sock = fileno(stdin);
2453 inblock.buffer = inbuffer;
2454 inblock.buffersize = sizeof(inbuffer);
2455 inblock.ptr = inbuffer;
2456 inblock.ptrend = inbuffer;
2458 outblock.sock = inblock.sock;
2459 outblock.buffersize = sizeof(outbuffer);
2460 outblock.buffer = outbuffer;
2461 outblock.ptr = outbuffer;
2462 outblock.cmd_count = 0;
2463 outblock.authenticating = FALSE;
2465 (void)smtp_write_command(&outblock, FALSE, "QUIT\r\n");
2466 (void)smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
2467 ob->command_timeout);
2468 (void)close(inblock.sock);
2473 /*************************************************
2474 * Prepare addresses for delivery *
2475 *************************************************/
2477 /* This function is called to flush out error settings from previous delivery
2478 attempts to other hosts. It also records whether we got here via an MX record
2479 or not in the more_errno field of the address. We are interested only in
2480 addresses that are still marked DEFER - others may have got delivered to a
2481 previously considered IP address. Set their status to PENDING_DEFER to indicate
2482 which ones are relevant this time.
2485 addrlist the list of addresses
2486 host the host we are delivering to
2488 Returns: the first address for this delivery
2491 static address_item *
2492 prepare_addresses(address_item *addrlist, host_item *host)
2494 address_item *first_addr = NULL;
2496 for (addr = addrlist; addr != NULL; addr = addr->next)
2498 if (addr->transport_return != DEFER) continue;
2499 if (first_addr == NULL) first_addr = addr;
2500 addr->transport_return = PENDING_DEFER;
2501 addr->basic_errno = 0;
2502 addr->more_errno = (host->mx >= 0)? 'M' : 'A';
2503 addr->message = NULL;
2505 addr->cipher = NULL;
2506 addr->peerdn = NULL;
2514 /*************************************************
2515 * Main entry point *
2516 *************************************************/
2518 /* See local README for interface details. As this is a remote transport, it is
2519 given a chain of addresses to be delivered in one connection, if possible. It
2520 always returns TRUE, indicating that each address has its own independent
2521 status set, except if there is a setting up problem, in which case it returns
2525 smtp_transport_entry(
2526 transport_instance *tblock, /* data for this instantiation */
2527 address_item *addrlist) /* addresses we are working on */
2531 int hosts_defer = 0;
2533 int hosts_looked_up = 0;
2534 int hosts_retry = 0;
2535 int hosts_serial = 0;
2536 int hosts_total = 0;
2537 int total_hosts_tried = 0;
2539 BOOL expired = TRUE;
2540 BOOL continuing = continue_hostname != NULL;
2541 uschar *expanded_hosts = NULL;
2543 uschar *tid = string_sprintf("%s transport", tblock->name);
2544 smtp_transport_options_block *ob =
2545 (smtp_transport_options_block *)(tblock->options_block);
2546 host_item *hostlist = addrlist->host_list;
2547 host_item *host = NULL;
2551 debug_printf("%s transport entered\n", tblock->name);
2552 for (addr = addrlist; addr != NULL; addr = addr->next)
2553 debug_printf(" %s\n", addr->address);
2554 if (continuing) debug_printf("already connected to %s [%s]\n",
2555 continue_hostname, continue_host_address);
2558 /* Set the flag requesting that these hosts be added to the waiting
2559 database if the delivery fails temporarily or if we are running with
2560 queue_smtp or a 2-stage queue run. This gets unset for certain
2561 kinds of error, typically those that are specific to the message. */
2563 update_waiting = TRUE;
2565 /* If a host list is not defined for the addresses - they must all have the
2566 same one in order to be passed to a single transport - or if the transport has
2567 a host list with hosts_override set, use the host list supplied with the
2568 transport. It is an error for this not to exist. */
2570 if (hostlist == NULL || (ob->hosts_override && ob->hosts != NULL))
2572 if (ob->hosts == NULL)
2574 addrlist->message = string_sprintf("%s transport called with no hosts set",
2576 addrlist->transport_return = PANIC;
2577 return FALSE; /* Only top address has status */
2580 DEBUG(D_transport) debug_printf("using the transport's hosts: %s\n",
2583 /* If the transport's host list contains no '$' characters, and we are not
2584 randomizing, it is fixed and therefore a chain of hosts can be built once
2585 and for all, and remembered for subsequent use by other calls to this
2586 transport. If, on the other hand, the host list does contain '$', or we are
2587 randomizing its order, we have to rebuild it each time. In the fixed case,
2588 as the hosts string will never be used again, it doesn't matter that we
2589 replace all the : characters with zeros. */
2591 if (ob->hostlist == NULL)
2593 uschar *s = ob->hosts;
2595 if (Ustrchr(s, '$') != NULL)
2597 expanded_hosts = expand_string(s);
2598 if (expanded_hosts == NULL)
2600 addrlist->message = string_sprintf("failed to expand list of hosts "
2601 "\"%s\" in %s transport: %s", s, tblock->name, expand_string_message);
2602 addrlist->transport_return = search_find_defer? DEFER : PANIC;
2603 return FALSE; /* Only top address has status */
2605 DEBUG(D_transport) debug_printf("expanded list of hosts \"%s\" to "
2606 "\"%s\"\n", s, expanded_hosts);
2610 if (ob->hosts_randomize) s = expanded_hosts = string_copy(s);
2612 host_build_hostlist(&hostlist, s, ob->hosts_randomize);
2614 /* Check that the expansion yielded something useful. */
2615 if (hostlist == NULL)
2618 string_sprintf("%s transport has empty hosts setting", tblock->name);
2619 addrlist->transport_return = PANIC;
2620 return FALSE; /* Only top address has status */
2623 /* If there was no expansion of hosts, save the host list for
2626 if (expanded_hosts == NULL) ob->hostlist = hostlist;
2629 /* This is not the first time this transport has been run in this delivery;
2630 the host list was built previously. */
2632 else hostlist = ob->hostlist;
2635 /* The host list was supplied with the address. If hosts_randomize is set, we
2636 must sort it into a random order if it did not come from MX records and has not
2637 already been randomized (but don't bother if continuing down an existing
2640 else if (ob->hosts_randomize && hostlist->mx == MX_NONE && !continuing)
2642 host_item *newlist = NULL;
2643 while (hostlist != NULL)
2645 host_item *h = hostlist;
2646 hostlist = hostlist->next;
2648 h->sort_key = random_number(100);
2650 if (newlist == NULL)
2655 else if (h->sort_key < newlist->sort_key)
2662 host_item *hh = newlist;
2663 while (hh->next != NULL)
2665 if (h->sort_key < hh->next->sort_key) break;
2673 hostlist = addrlist->host_list = newlist;
2677 /* Sort out the default port. */
2679 if (!smtp_get_port(ob->port, addrlist, &port, tid)) return FALSE;
2682 /* For each host-plus-IP-address on the list:
2684 . If this is a continued delivery and the host isn't the one with the
2685 current connection, skip.
2687 . If the status is unusable (i.e. previously failed or retry checked), skip.
2689 . If no IP address set, get the address, either by turning the name into
2690 an address, calling gethostbyname if gethostbyname is on, or by calling
2691 the DNS. The DNS may yield multiple addresses, in which case insert the
2692 extra ones into the list.
2694 . Get the retry data if not previously obtained for this address and set the
2695 field which remembers the state of this address. Skip if the retry time is
2696 not reached. If not, remember whether retry data was found. The retry string
2697 contains both the name and the IP address.
2699 . Scan the list of addresses and mark those whose status is DEFER as
2700 PENDING_DEFER. These are the only ones that will be processed in this cycle
2703 . Make a delivery attempt - addresses marked PENDING_DEFER will be tried.
2704 Some addresses may be successfully delivered, others may fail, and yet
2705 others may get temporary errors and so get marked DEFER.
2707 . The return from the delivery attempt is OK if a connection was made and a
2708 valid SMTP dialogue was completed. Otherwise it is DEFER.
2710 . If OK, add a "remove" retry item for this host/IPaddress, if any.
2712 . If fail to connect, or other defer state, add a retry item.
2714 . If there are any addresses whose status is still DEFER, carry on to the
2715 next host/IPaddress, unless we have tried the number of hosts given
2716 by hosts_max_try or hosts_max_try_hardlimit; otherwise return. Note that
2717 there is some fancy logic for hosts_max_try that means its limit can be
2718 overstepped in some circumstances.
2720 If we get to the end of the list, all hosts have deferred at least one address,
2721 or not reached their retry times. If delay_after_cutoff is unset, it requests a
2722 delivery attempt to those hosts whose last try was before the arrival time of
2723 the current message. To cope with this, we have to go round the loop a second
2724 time. After that, set the status and error data for any addresses that haven't
2725 had it set already. */
2727 for (cutoff_retry = 0; expired &&
2728 cutoff_retry < ((ob->delay_after_cutoff)? 1 : 2);
2731 host_item *nexthost = NULL;
2732 int unexpired_hosts_tried = 0;
2734 for (host = hostlist;
2736 unexpired_hosts_tried < ob->hosts_max_try &&
2737 total_hosts_tried < ob->hosts_max_try_hardlimit;
2743 BOOL serialized = FALSE;
2744 BOOL host_is_expired = FALSE;
2745 BOOL message_defer = FALSE;
2746 BOOL ifchanges = FALSE;
2747 BOOL some_deferred = FALSE;
2748 address_item *first_addr = NULL;
2749 uschar *interface = NULL;
2750 uschar *retry_host_key = NULL;
2751 uschar *retry_message_key = NULL;
2752 uschar *serialize_key = NULL;
2754 /* Default next host is next host. :-) But this can vary if the
2755 hosts_max_try limit is hit (see below). It may also be reset if a host
2756 address is looked up here (in case the host was multihomed). */
2758 nexthost = host->next;
2760 /* If the address hasn't yet been obtained from the host name, look it up
2761 now, unless the host is already marked as unusable. If it is marked as
2762 unusable, it means that the router was unable to find its IP address (in
2763 the DNS or wherever) OR we are in the 2nd time round the cutoff loop, and
2764 the lookup failed last time. We don't get this far if *all* MX records
2765 point to non-existent hosts; that is treated as a hard error.
2767 We can just skip this host entirely. When the hosts came from the router,
2768 the address will timeout based on the other host(s); when the address is
2769 looked up below, there is an explicit retry record added.
2771 Note that we mustn't skip unusable hosts if the address is not unset; they
2772 may be needed as expired hosts on the 2nd time round the cutoff loop. */
2774 if (host->address == NULL)
2776 int new_port, flags;
2778 uschar *canonical_name;
2780 if (host->status >= hstatus_unusable)
2782 DEBUG(D_transport) debug_printf("%s has no address and is unusable - skipping\n",
2787 DEBUG(D_transport) debug_printf("getting address for %s\n", host->name);
2789 /* The host name is permitted to have an attached port. Find it, and
2790 strip it from the name. Just remember it for now. */
2792 new_port = host_item_get_port(host);
2794 /* Count hosts looked up */
2798 /* Find by name if so configured, or if it's an IP address. We don't
2799 just copy the IP address, because we need the test-for-local to happen. */
2801 flags = HOST_FIND_BY_A;
2802 if (ob->dns_qualify_single) flags |= HOST_FIND_QUALIFY_SINGLE;
2803 if (ob->dns_search_parents) flags |= HOST_FIND_SEARCH_PARENTS;
2805 if (ob->gethostbyname || string_is_ip_address(host->name, NULL) != 0)
2806 rc = host_find_byname(host, NULL, flags, &canonical_name, TRUE);
2808 rc = host_find_bydns(host, NULL, flags, NULL, NULL, NULL,
2809 &canonical_name, NULL);
2811 /* Update the host (and any additional blocks, resulting from
2812 multihoming) with a host-specific port, if any. */
2814 for (hh = host; hh != nexthost; hh = hh->next) hh->port = new_port;
2816 /* Failure to find the host at this time (usually DNS temporary failure)
2817 is really a kind of routing failure rather than a transport failure.
2818 Therefore we add a retry item of the routing kind, not to stop us trying
2819 to look this name up here again, but to ensure the address gets timed
2820 out if the failures go on long enough. A complete failure at this point
2821 commonly points to a configuration error, but the best action is still
2822 to carry on for the next host. */
2824 if (rc == HOST_FIND_AGAIN || rc == HOST_FIND_FAILED)
2826 retry_add_item(addrlist, string_sprintf("R:%s", host->name), 0);
2828 if (rc == HOST_FIND_AGAIN) hosts_defer++; else hosts_fail++;
2829 DEBUG(D_transport) debug_printf("rc = %s for %s\n", (rc == HOST_FIND_AGAIN)?
2830 "HOST_FIND_AGAIN" : "HOST_FIND_FAILED", host->name);
2831 host->status = hstatus_unusable;
2833 for (addr = addrlist; addr != NULL; addr = addr->next)
2835 if (addr->transport_return != DEFER) continue;
2836 addr->basic_errno = ERRNO_UNKNOWNHOST;
2838 string_sprintf("failed to lookup IP address for %s", host->name);
2843 /* If the host is actually the local host, we may have a problem, or
2844 there may be some cunning configuration going on. In the problem case,
2845 log things and give up. The default transport status is already DEFER. */
2847 if (rc == HOST_FOUND_LOCAL && !ob->allow_localhost)
2849 for (addr = addrlist; addr != NULL; addr = addr->next)
2851 addr->basic_errno = 0;
2852 addr->message = string_sprintf("%s transport found host %s to be "
2853 "local", tblock->name, host->name);
2857 } /* End of block for IP address lookup */
2859 /* If this is a continued delivery, we are interested only in the host
2860 which matches the name of the existing open channel. The check is put
2861 here after the local host lookup, in case the name gets expanded as a
2862 result of the lookup. Set expired FALSE, to save the outer loop executing
2865 if (continuing && (Ustrcmp(continue_hostname, host->name) != 0 ||
2866 Ustrcmp(continue_host_address, host->address) != 0))
2869 continue; /* With next host */
2872 /* Reset the default next host in case a multihomed host whose addresses
2873 are not looked up till just above added to the host list. */
2875 nexthost = host->next;
2877 /* If queue_smtp is set (-odqs or the first part of a 2-stage run), or the
2878 domain is in queue_smtp_domains, we don't actually want to attempt any
2879 deliveries. When doing a queue run, queue_smtp_domains is always unset. If
2880 there is a lookup defer in queue_smtp_domains, proceed as if the domain
2881 were not in it. We don't want to hold up all SMTP deliveries! Except when
2882 doing a two-stage queue run, don't do this if forcing. */
2884 if ((!deliver_force || queue_2stage) && (queue_smtp ||
2885 match_isinlist(addrlist->domain, &queue_smtp_domains, 0,
2886 &domainlist_anchor, NULL, MCL_DOMAIN, TRUE, NULL) == OK))
2889 for (addr = addrlist; addr != NULL; addr = addr->next)
2891 if (addr->transport_return != DEFER) continue;
2892 addr->message = US"domain matches queue_smtp_domains, or -odqs set";
2894 continue; /* With next host */
2897 /* Count hosts being considered - purely for an intelligent comment
2898 if none are usable. */
2902 /* Set $host and $host address now in case they are needed for the
2903 interface expansion or the serialize_hosts check; they remain set if an
2904 actual delivery happens. */
2906 deliver_host = host->name;
2907 deliver_host_address = host->address;
2909 /* Set up a string for adding to the retry key if the port number is not
2910 the standard SMTP port. A host may have its own port setting that overrides
2913 pistring = string_sprintf(":%d", (host->port == PORT_NONE)?
2915 if (Ustrcmp(pistring, ":25") == 0) pistring = US"";
2917 /* Select IPv4 or IPv6, and choose an outgoing interface. If the interface
2918 string changes upon expansion, we must add it to the key that is used for
2919 retries, because connections to the same host from a different interface
2920 should be treated separately. */
2922 host_af = (Ustrchr(host->address, ':') == NULL)? AF_INET : AF_INET6;
2923 if (!smtp_get_interface(ob->interface, host_af, addrlist, &ifchanges,
2926 if (ifchanges) pistring = string_sprintf("%s/%s", pistring, interface);
2928 /* The first time round the outer loop, check the status of the host by
2929 inspecting the retry data. The second time round, we are interested only
2930 in expired hosts that haven't been tried since this message arrived. */
2932 if (cutoff_retry == 0)
2934 /* Ensure the status of the address is set by checking retry data if
2935 necessary. There maybe host-specific retry data (applicable to all
2936 messages) and also data for retries of a specific message at this host.
2937 If either of these retry records are actually read, the keys used are
2938 returned to save recomputing them later. */
2940 host_is_expired = retry_check_address(addrlist->domain, host, pistring,
2941 ob->retry_include_ip_address, &retry_host_key, &retry_message_key);
2943 DEBUG(D_transport) debug_printf("%s [%s]%s status = %s\n", host->name,
2944 (host->address == NULL)? US"" : host->address, pistring,
2945 (host->status == hstatus_usable)? "usable" :
2946 (host->status == hstatus_unusable)? "unusable" :
2947 (host->status == hstatus_unusable_expired)? "unusable (expired)" : "?");
2949 /* Skip this address if not usable at this time, noting if it wasn't
2950 actually expired, both locally and in the address. */
2952 switch (host->status)
2954 case hstatus_unusable:
2956 setflag(addrlist, af_retry_skipped);
2959 case hstatus_unusable_expired:
2962 case hwhy_retry: hosts_retry++; break;
2963 case hwhy_failed: hosts_fail++; break;
2964 case hwhy_deferred: hosts_defer++; break;
2967 /* If there was a retry message key, implying that previously there
2968 was a message-specific defer, we don't want to update the list of
2969 messages waiting for these hosts. */
2971 if (retry_message_key != NULL) update_waiting = FALSE;
2972 continue; /* With the next host or IP address */
2976 /* Second time round the loop: if the address is set but expired, and
2977 the message is newer than the last try, let it through. */
2981 if (host->address == NULL ||
2982 host->status != hstatus_unusable_expired ||
2983 host->last_try > received_time)
2986 debug_printf("trying expired host %s [%s]%s\n",
2987 host->name, host->address, pistring);
2988 host_is_expired = TRUE;
2991 /* Setting "expired=FALSE" doesn't actually mean not all hosts are expired;
2992 it remains TRUE only if all hosts are expired and none are actually tried.
2997 /* If this host is listed as one to which access must be serialized,
2998 see if another Exim process has a connection to it, and if so, skip
2999 this host. If not, update the database to record our connection to it
3000 and remember this for later deletion. Do not do any of this if we are
3001 sending the message down a pre-existing connection. */
3004 verify_check_this_host(&(ob->serialize_hosts), NULL, host->name,
3005 host->address, NULL) == OK)
3007 serialize_key = string_sprintf("host-serialize-%s", host->name);
3008 if (!enq_start(serialize_key))
3011 debug_printf("skipping host %s because another Exim process "
3012 "is connected to it\n", host->name);
3019 /* OK, we have an IP address that is not waiting for its retry time to
3020 arrive (it might be expired) OR (second time round the loop) we have an
3021 expired host that hasn't been tried since the message arrived. Have a go
3022 at delivering the message to it. First prepare the addresses by flushing
3023 out the result of previous attempts, and finding the first address that
3024 is still to be delivered. */
3026 first_addr = prepare_addresses(addrlist, host);
3028 DEBUG(D_transport) debug_printf("delivering %s to %s [%s] (%s%s)\n",
3029 message_id, host->name, host->address, addrlist->address,
3030 (addrlist->next == NULL)? "" : ", ...");
3032 set_process_info("delivering %s to %s [%s] (%s%s)",
3033 message_id, host->name, host->address, addrlist->address,
3034 (addrlist->next == NULL)? "" : ", ...");
3036 /* This is not for real; don't do the delivery. If there are
3037 any remaining hosts, list them. */
3042 set_errno(addrlist, 0, NULL, OK, FALSE);
3043 for (addr = addrlist; addr != NULL; addr = addr->next)
3045 addr->host_used = host;
3046 addr->special_action = '*';
3047 addr->message = US"delivery bypassed by -N option";
3051 debug_printf("*** delivery by %s transport bypassed by -N option\n"
3052 "*** host and remaining hosts:\n", tblock->name);
3053 for (host2 = host; host2 != NULL; host2 = host2->next)
3054 debug_printf(" %s [%s]\n", host2->name,
3055 (host2->address == NULL)? US"unset" : host2->address);
3060 /* This is for real. If the host is expired, we don't count it for
3061 hosts_max_retry. This ensures that all hosts must expire before an address
3062 is timed out, unless hosts_max_try_hardlimit (which protects against
3063 lunatic DNS configurations) is reached.
3065 If the host is not expired and we are about to hit the hosts_max_retry
3066 limit, check to see if there is a subsequent hosts with a different MX
3067 value. If so, make that the next host, and don't count this one. This is a
3068 heuristic to make sure that different MXs do get tried. With a normal kind
3069 of retry rule, they would get tried anyway when the earlier hosts were
3070 delayed, but if the domain has a "retry every time" type of rule - as is
3071 often used for the the very large ISPs, that won't happen. */
3075 if (!host_is_expired && ++unexpired_hosts_tried >= ob->hosts_max_try)
3079 debug_printf("hosts_max_try limit reached with this host\n");
3080 for (h = host; h != NULL; h = h->next)
3081 if (h->mx != host->mx) break;
3085 unexpired_hosts_tried--;
3086 DEBUG(D_transport) debug_printf("however, a higher MX host exists "
3087 "and will be tried\n");
3091 /* Attempt the delivery. */
3093 total_hosts_tried++;
3094 rc = smtp_deliver(addrlist, host, host_af, port, interface, tblock,
3095 expanded_hosts != NULL, &message_defer, FALSE);
3098 OK => connection made, each address contains its result;
3099 message_defer is set for message-specific defers (when all
3100 recipients are marked defer)
3101 DEFER => there was a non-message-specific delivery problem;
3102 ERROR => there was a problem setting up the arguments for a filter,
3103 or there was a problem with expanding added headers
3106 /* If the result is not OK, there was a non-message-specific problem.
3107 If the result is DEFER, we need to write to the logs saying what happened
3108 for this particular host, except in the case of authentication and TLS
3109 failures, where the log has already been written. If all hosts defer a
3110 general message is written at the end. */
3112 if (rc == DEFER && first_addr->basic_errno != ERRNO_AUTHFAIL &&
3113 first_addr->basic_errno != ERRNO_TLSFAILURE)
3114 write_logs(first_addr, host);
3116 #ifdef EXPERIMENTAL_DBL
3118 dbl_write_defer_log(ob->dbl_host_defer_query, first_addr, host);
3121 /* If STARTTLS was accepted, but there was a failure in setting up the
3122 TLS session (usually a certificate screwup), and the host is not in
3123 hosts_require_tls, and tls_tempfail_tryclear is true, try again, with
3124 TLS forcibly turned off. We have to start from scratch with a new SMTP
3125 connection. That's why the retry is done from here, not from within
3126 smtp_deliver(). [Rejections of STARTTLS itself don't screw up the
3127 session, so the in-clear transmission after those errors, if permitted,
3128 happens inside smtp_deliver().] */
3131 if (rc == DEFER && first_addr->basic_errno == ERRNO_TLSFAILURE &&
3132 ob->tls_tempfail_tryclear &&
3133 verify_check_this_host(&(ob->hosts_require_tls), NULL, host->name,
3134 host->address, NULL) != OK)
3136 log_write(0, LOG_MAIN, "TLS session failure: delivering unencrypted "
3137 "to %s [%s] (not in hosts_require_tls)", host->name, host->address);
3138 first_addr = prepare_addresses(addrlist, host);
3139 rc = smtp_deliver(addrlist, host, host_af, port, interface, tblock,
3140 expanded_hosts != NULL, &message_defer, TRUE);
3141 if (rc == DEFER && first_addr->basic_errno != ERRNO_AUTHFAIL)
3142 write_logs(first_addr, host);
3143 #ifdef EXPERIMENTAL_DBL
3145 dbl_write_defer_log(ob->dbl_host_defer_query, first_addr, host);
3151 /* Delivery attempt finished */
3153 rs = (rc == OK)? US"OK" : (rc == DEFER)? US"DEFER" : (rc == ERROR)?
3156 set_process_info("delivering %s: just tried %s [%s] for %s%s: result %s",
3157 message_id, host->name, host->address, addrlist->address,
3158 (addrlist->next == NULL)? "" : " (& others)", rs);
3160 /* Release serialization if set up */
3162 if (serialized) enq_end(serialize_key);
3164 /* If the result is DEFER, or if a host retry record is known to exist, we
3165 need to add an item to the retry chain for updating the retry database
3166 at the end of delivery. We only need to add the item to the top address,
3167 of course. Also, if DEFER, we mark the IP address unusable so as to skip it
3168 for any other delivery attempts using the same address. (It is copied into
3169 the unusable tree at the outer level, so even if different address blocks
3170 contain the same address, it still won't get tried again.) */
3172 if (rc == DEFER || retry_host_key != NULL)
3174 int delete_flag = (rc != DEFER)? rf_delete : 0;
3175 if (retry_host_key == NULL)
3177 retry_host_key = ob->retry_include_ip_address?
3178 string_sprintf("T:%S:%s%s", host->name, host->address, pistring) :
3179 string_sprintf("T:%S%s", host->name, pistring);
3182 /* If a delivery of another message over an existing SMTP connection
3183 yields DEFER, we do NOT set up retry data for the host. This covers the
3184 case when there are delays in routing the addresses in the second message
3185 that are so long that the server times out. This is alleviated by not
3186 routing addresses that previously had routing defers when handling an
3187 existing connection, but even so, this case may occur (e.g. if a
3188 previously happily routed address starts giving routing defers). If the
3189 host is genuinely down, another non-continued message delivery will
3190 notice it soon enough. */
3192 if (delete_flag != 0 || !continuing)
3193 retry_add_item(first_addr, retry_host_key, rf_host | delete_flag);
3195 /* We may have tried an expired host, if its retry time has come; ensure
3196 the status reflects the expiry for the benefit of any other addresses. */
3200 host->status = (host_is_expired)?
3201 hstatus_unusable_expired : hstatus_unusable;
3202 host->why = hwhy_deferred;
3206 /* If message_defer is set (host was OK, but every recipient got deferred
3207 because of some message-specific problem), or if that had happened
3208 previously so that a message retry key exists, add an appropriate item
3209 to the retry chain. Note that if there was a message defer but now there is
3210 a host defer, the message defer record gets deleted. That seems perfectly
3211 reasonable. Also, stop the message from being remembered as waiting
3212 for specific hosts. */
3214 if (message_defer || retry_message_key != NULL)
3216 int delete_flag = message_defer? 0 : rf_delete;
3217 if (retry_message_key == NULL)
3219 retry_message_key = ob->retry_include_ip_address?
3220 string_sprintf("T:%S:%s%s:%s", host->name, host->address, pistring,
3222 string_sprintf("T:%S%s:%s", host->name, pistring, message_id);
3224 retry_add_item(addrlist, retry_message_key,
3225 rf_message | rf_host | delete_flag);
3226 update_waiting = FALSE;
3229 /* Any return other than DEFER (that is, OK or ERROR) means that the
3230 addresses have got their final statuses filled in for this host. In the OK
3231 case, see if any of them are deferred. */
3235 for (addr = addrlist; addr != NULL; addr = addr->next)
3237 if (addr->transport_return == DEFER)
3239 some_deferred = TRUE;
3245 /* If no addresses deferred or the result was ERROR, return. We do this for
3246 ERROR because a failing filter set-up or add_headers expansion is likely to
3247 fail for any host we try. */
3249 if (rc == ERROR || (rc == OK && !some_deferred))
3251 DEBUG(D_transport) debug_printf("Leaving %s transport\n", tblock->name);
3252 return TRUE; /* Each address has its status */
3255 /* If the result was DEFER or some individual addresses deferred, let
3256 the loop run to try other hosts with the deferred addresses, except for the
3257 case when we were trying to deliver down an existing channel and failed.
3258 Don't try any other hosts in this case. */
3260 if (continuing) break;
3262 /* If the whole delivery, or some individual addresses, were deferred and
3263 there are more hosts that could be tried, do not count this host towards
3264 the hosts_max_try limit if the age of the message is greater than the
3265 maximum retry time for this host. This means we may try try all hosts,
3266 ignoring the limit, when messages have been around for some time. This is
3267 important because if we don't try all hosts, the address will never time
3268 out. NOTE: this does not apply to hosts_max_try_hardlimit. */
3270 if ((rc == DEFER || some_deferred) && nexthost != NULL)
3273 retry_config *retry = retry_find_config(host->name, NULL, 0, 0);
3275 if (retry != NULL && retry->rules != NULL)
3277 retry_rule *last_rule;
3278 for (last_rule = retry->rules;
3279 last_rule->next != NULL;
3280 last_rule = last_rule->next);
3281 timedout = time(NULL) - received_time > last_rule->timeout;
3283 else timedout = TRUE; /* No rule => timed out */
3287 unexpired_hosts_tried--;
3288 DEBUG(D_transport) debug_printf("temporary delivery error(s) override "
3289 "hosts_max_try (message older than host's retry time)\n");
3292 } /* End of loop for trying multiple hosts. */
3294 /* This is the end of the loop that repeats iff expired is TRUE and
3295 ob->delay_after_cutoff is FALSE. The second time round we will
3296 try those hosts that haven't been tried since the message arrived. */
3300 debug_printf("all IP addresses skipped or deferred at least one address\n");
3301 if (expired && !ob->delay_after_cutoff && cutoff_retry == 0)
3302 debug_printf("retrying IP addresses not tried since message arrived\n");
3307 /* Get here if all IP addresses are skipped or defer at least one address. In
3308 MUA wrapper mode, this will happen only for connection or other non-message-
3309 specific failures. Force the delivery status for all addresses to FAIL. */
3313 for (addr = addrlist; addr != NULL; addr = addr->next)
3314 addr->transport_return = FAIL;
3318 /* In the normal, non-wrapper case, add a standard message to each deferred
3319 address if there hasn't been an error, that is, if it hasn't actually been
3320 tried this time. The variable "expired" will be FALSE if any deliveries were
3321 actually tried, or if there was at least one host that was not expired. That
3322 is, it is TRUE only if no deliveries were tried and all hosts were expired. If
3323 a delivery has been tried, an error code will be set, and the failing of the
3324 message is handled by the retry code later.
3326 If queue_smtp is set, or this transport was called to send a subsequent message
3327 down an existing TCP/IP connection, and something caused the host not to be
3328 found, we end up here, but can detect these cases and handle them specially. */
3330 for (addr = addrlist; addr != NULL; addr = addr->next)
3332 /* If host is not NULL, it means that we stopped processing the host list
3333 because of hosts_max_try or hosts_max_try_hardlimit. In the former case, this
3334 means we need to behave as if some hosts were skipped because their retry
3335 time had not come. Specifically, this prevents the address from timing out.
3336 However, if we have hit hosts_max_try_hardlimit, we want to behave as if all
3337 hosts were tried. */
3341 if (total_hosts_tried >= ob->hosts_max_try_hardlimit)
3344 debug_printf("hosts_max_try_hardlimit reached: behave as if all "
3345 "hosts were tried\n");
3350 debug_printf("hosts_max_try limit caused some hosts to be skipped\n");
3351 setflag(addr, af_retry_skipped);
3355 if (queue_smtp) /* no deliveries attempted */
3357 addr->transport_return = DEFER;
3358 addr->basic_errno = 0;
3359 addr->message = US"SMTP delivery explicitly queued";
3362 else if (addr->transport_return == DEFER &&
3363 (addr->basic_errno == ERRNO_UNKNOWNERROR || addr->basic_errno == 0) &&
3364 addr->message == NULL)
3366 addr->basic_errno = ERRNO_HRETRY;
3367 if (continue_hostname != NULL)
3369 addr->message = US"no host found for existing SMTP connection";
3373 setflag(addr, af_pass_message); /* This is not a security risk */
3374 addr->message = (ob->delay_after_cutoff)?
3375 US"retry time not reached for any host after a long failure period" :
3376 US"all hosts have been failing for a long time and were last tried "
3377 "after this message arrived";
3379 /* If we are already using fallback hosts, or there are no fallback hosts
3380 defined, convert the result to FAIL to cause a bounce. */
3382 if (addr->host_list == addr->fallback_hosts ||
3383 addr->fallback_hosts == NULL)
3384 addr->transport_return = FAIL;
3388 if (hosts_retry == hosts_total)
3389 addr->message = US"retry time not reached for any host";
3390 else if (hosts_fail == hosts_total)
3391 addr->message = US"all host address lookups failed permanently";
3392 else if (hosts_defer == hosts_total)
3393 addr->message = US"all host address lookups failed temporarily";
3394 else if (hosts_serial == hosts_total)
3395 addr->message = US"connection limit reached for all hosts";
3396 else if (hosts_fail+hosts_defer == hosts_total)
3397 addr->message = US"all host address lookups failed";
3398 else addr->message = US"some host address lookups failed and retry time "
3399 "not reached for other hosts or connection limit reached";
3404 /* Update the database which keeps information about which messages are waiting
3405 for which hosts to become available. For some message-specific errors, the
3406 update_waiting flag is turned off because we don't want follow-on deliveries in
3407 those cases. If this transport instance is explicitly limited to one message
3408 per connection then follow-on deliveries are not possible and there's no need
3409 to create/update the per-transport wait-<transport_name> database. */
3411 if (update_waiting && tblock->connection_max_messages != 1)
3412 transport_update_waiting(hostlist, tblock->name);
3416 DEBUG(D_transport) debug_printf("Leaving %s transport\n", tblock->name);
3418 return TRUE; /* Each address has its status */
3421 /* End of transport/smtp.c */
git://git.exim.org / users / jgh / exim.git / blob