tidying
[exim.git] / src / src / transports / smtp.c
1 /*************************************************
2 * Exim - an Internet mail transport agent *
3 *************************************************/
4
5 /* Copyright (c) University of Cambridge 1995 - 2016 */
6 /* See the file NOTICE for conditions of use and distribution. */
7
8 #include "../exim.h"
9 #include "smtp.h"
10
11 #define PENDING 256
12 #define PENDING_DEFER (PENDING + DEFER)
13 #define PENDING_OK (PENDING + OK)
14
15
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. */
20
21 optionlist smtp_transport_options[] = {
22 { "*expand_multi_domain", opt_stringptr | opt_hidden | opt_public,
23 (void *)offsetof(transport_instance, expand_multi_domain) },
24 { "*expand_retry_include_ip_address", opt_stringptr | opt_hidden,
25 (void *)(offsetof(smtp_transport_options_block, expand_retry_include_ip_address)) },
26
27 { "address_retry_include_sender", opt_bool,
28 (void *)offsetof(smtp_transport_options_block, address_retry_include_sender) },
29 { "allow_localhost", opt_bool,
30 (void *)offsetof(smtp_transport_options_block, allow_localhost) },
31 { "authenticated_sender", opt_stringptr,
32 (void *)offsetof(smtp_transport_options_block, authenticated_sender) },
33 { "authenticated_sender_force", opt_bool,
34 (void *)offsetof(smtp_transport_options_block, authenticated_sender_force) },
35 { "command_timeout", opt_time,
36 (void *)offsetof(smtp_transport_options_block, command_timeout) },
37 { "connect_timeout", opt_time,
38 (void *)offsetof(smtp_transport_options_block, connect_timeout) },
39 { "connection_max_messages", opt_int | opt_public,
40 (void *)offsetof(transport_instance, connection_max_messages) },
41 { "data_timeout", opt_time,
42 (void *)offsetof(smtp_transport_options_block, data_timeout) },
43 { "delay_after_cutoff", opt_bool,
44 (void *)offsetof(smtp_transport_options_block, delay_after_cutoff) },
45 #ifndef DISABLE_DKIM
46 { "dkim_canon", opt_stringptr,
47 (void *)offsetof(smtp_transport_options_block, dkim.dkim_canon) },
48 { "dkim_domain", opt_stringptr,
49 (void *)offsetof(smtp_transport_options_block, dkim.dkim_domain) },
50 { "dkim_private_key", opt_stringptr,
51 (void *)offsetof(smtp_transport_options_block, dkim.dkim_private_key) },
52 { "dkim_selector", opt_stringptr,
53 (void *)offsetof(smtp_transport_options_block, dkim.dkim_selector) },
54 { "dkim_sign_headers", opt_stringptr,
55 (void *)offsetof(smtp_transport_options_block, dkim.dkim_sign_headers) },
56 { "dkim_strict", opt_stringptr,
57 (void *)offsetof(smtp_transport_options_block, dkim.dkim_strict) },
58 #endif
59 { "dns_qualify_single", opt_bool,
60 (void *)offsetof(smtp_transport_options_block, dns_qualify_single) },
61 { "dns_search_parents", opt_bool,
62 (void *)offsetof(smtp_transport_options_block, dns_search_parents) },
63 { "dnssec_request_domains", opt_stringptr,
64 (void *)offsetof(smtp_transport_options_block, dnssec.request) },
65 { "dnssec_require_domains", opt_stringptr,
66 (void *)offsetof(smtp_transport_options_block, dnssec.require) },
67 { "dscp", opt_stringptr,
68 (void *)offsetof(smtp_transport_options_block, dscp) },
69 { "fallback_hosts", opt_stringptr,
70 (void *)offsetof(smtp_transport_options_block, fallback_hosts) },
71 { "final_timeout", opt_time,
72 (void *)offsetof(smtp_transport_options_block, final_timeout) },
73 { "gethostbyname", opt_bool,
74 (void *)offsetof(smtp_transport_options_block, gethostbyname) },
75 { "helo_data", opt_stringptr,
76 (void *)offsetof(smtp_transport_options_block, helo_data) },
77 { "hosts", opt_stringptr,
78 (void *)offsetof(smtp_transport_options_block, hosts) },
79 { "hosts_avoid_esmtp", opt_stringptr,
80 (void *)offsetof(smtp_transport_options_block, hosts_avoid_esmtp) },
81 { "hosts_avoid_pipelining", opt_stringptr,
82 (void *)offsetof(smtp_transport_options_block, hosts_avoid_pipelining) },
83 #ifdef SUPPORT_TLS
84 { "hosts_avoid_tls", opt_stringptr,
85 (void *)offsetof(smtp_transport_options_block, hosts_avoid_tls) },
86 #endif
87 { "hosts_max_try", opt_int,
88 (void *)offsetof(smtp_transport_options_block, hosts_max_try) },
89 { "hosts_max_try_hardlimit", opt_int,
90 (void *)offsetof(smtp_transport_options_block, hosts_max_try_hardlimit) },
91 #ifdef SUPPORT_TLS
92 { "hosts_nopass_tls", opt_stringptr,
93 (void *)offsetof(smtp_transport_options_block, hosts_nopass_tls) },
94 #endif
95 { "hosts_override", opt_bool,
96 (void *)offsetof(smtp_transport_options_block, hosts_override) },
97 { "hosts_randomize", opt_bool,
98 (void *)offsetof(smtp_transport_options_block, hosts_randomize) },
99 #if defined(SUPPORT_TLS) && !defined(DISABLE_OCSP)
100 { "hosts_request_ocsp", opt_stringptr,
101 (void *)offsetof(smtp_transport_options_block, hosts_request_ocsp) },
102 #endif
103 { "hosts_require_auth", opt_stringptr,
104 (void *)offsetof(smtp_transport_options_block, hosts_require_auth) },
105 #ifdef SUPPORT_TLS
106 # ifdef EXPERIMENTAL_DANE
107 { "hosts_require_dane", opt_stringptr,
108 (void *)offsetof(smtp_transport_options_block, hosts_require_dane) },
109 # endif
110 # ifndef DISABLE_OCSP
111 { "hosts_require_ocsp", opt_stringptr,
112 (void *)offsetof(smtp_transport_options_block, hosts_require_ocsp) },
113 # endif
114 { "hosts_require_tls", opt_stringptr,
115 (void *)offsetof(smtp_transport_options_block, hosts_require_tls) },
116 #endif
117 { "hosts_try_auth", opt_stringptr,
118 (void *)offsetof(smtp_transport_options_block, hosts_try_auth) },
119 #if defined(SUPPORT_TLS) && defined(EXPERIMENTAL_DANE)
120 { "hosts_try_dane", opt_stringptr,
121 (void *)offsetof(smtp_transport_options_block, hosts_try_dane) },
122 #endif
123 #ifndef DISABLE_PRDR
124 { "hosts_try_prdr", opt_stringptr,
125 (void *)offsetof(smtp_transport_options_block, hosts_try_prdr) },
126 #endif
127 #ifdef SUPPORT_TLS
128 { "hosts_verify_avoid_tls", opt_stringptr,
129 (void *)offsetof(smtp_transport_options_block, hosts_verify_avoid_tls) },
130 #endif
131 { "interface", opt_stringptr,
132 (void *)offsetof(smtp_transport_options_block, interface) },
133 { "keepalive", opt_bool,
134 (void *)offsetof(smtp_transport_options_block, keepalive) },
135 { "lmtp_ignore_quota", opt_bool,
136 (void *)offsetof(smtp_transport_options_block, lmtp_ignore_quota) },
137 { "max_rcpt", opt_int | opt_public,
138 (void *)offsetof(transport_instance, max_addresses) },
139 { "multi_domain", opt_expand_bool | opt_public,
140 (void *)offsetof(transport_instance, multi_domain) },
141 { "port", opt_stringptr,
142 (void *)offsetof(smtp_transport_options_block, port) },
143 { "protocol", opt_stringptr,
144 (void *)offsetof(smtp_transport_options_block, protocol) },
145 { "retry_include_ip_address", opt_expand_bool,
146 (void *)offsetof(smtp_transport_options_block, retry_include_ip_address) },
147 { "serialize_hosts", opt_stringptr,
148 (void *)offsetof(smtp_transport_options_block, serialize_hosts) },
149 { "size_addition", opt_int,
150 (void *)offsetof(smtp_transport_options_block, size_addition) }
151 #ifdef SUPPORT_SOCKS
152 ,{ "socks_proxy", opt_stringptr,
153 (void *)offsetof(smtp_transport_options_block, socks_proxy) }
154 #endif
155 #ifdef SUPPORT_TLS
156 ,{ "tls_certificate", opt_stringptr,
157 (void *)offsetof(smtp_transport_options_block, tls_certificate) },
158 { "tls_crl", opt_stringptr,
159 (void *)offsetof(smtp_transport_options_block, tls_crl) },
160 { "tls_dh_min_bits", opt_int,
161 (void *)offsetof(smtp_transport_options_block, tls_dh_min_bits) },
162 { "tls_privatekey", opt_stringptr,
163 (void *)offsetof(smtp_transport_options_block, tls_privatekey) },
164 { "tls_require_ciphers", opt_stringptr,
165 (void *)offsetof(smtp_transport_options_block, tls_require_ciphers) },
166 { "tls_sni", opt_stringptr,
167 (void *)offsetof(smtp_transport_options_block, tls_sni) },
168 { "tls_tempfail_tryclear", opt_bool,
169 (void *)offsetof(smtp_transport_options_block, tls_tempfail_tryclear) },
170 { "tls_try_verify_hosts", opt_stringptr,
171 (void *)offsetof(smtp_transport_options_block, tls_try_verify_hosts) },
172 { "tls_verify_cert_hostnames", opt_stringptr,
173 (void *)offsetof(smtp_transport_options_block,tls_verify_cert_hostnames)},
174 { "tls_verify_certificates", opt_stringptr,
175 (void *)offsetof(smtp_transport_options_block, tls_verify_certificates) },
176 { "tls_verify_hosts", opt_stringptr,
177 (void *)offsetof(smtp_transport_options_block, tls_verify_hosts) }
178 #endif
179 };
180
181 /* Size of the options list. An extern variable has to be used so that its
182 address can appear in the tables drtables.c. */
183
184 int smtp_transport_options_count =
185 sizeof(smtp_transport_options)/sizeof(optionlist);
186
187 /* Default private options block for the smtp transport. */
188
189 smtp_transport_options_block smtp_transport_option_defaults = {
190 NULL, /* hosts */
191 NULL, /* fallback_hosts */
192 NULL, /* hostlist */
193 NULL, /* fallback_hostlist */
194 NULL, /* authenticated_sender */
195 US"$primary_hostname", /* helo_data */
196 NULL, /* interface */
197 NULL, /* port */
198 US"smtp", /* protocol */
199 NULL, /* DSCP */
200 NULL, /* serialize_hosts */
201 NULL, /* hosts_try_auth */
202 NULL, /* hosts_require_auth */
203 #ifdef EXPERIMENTAL_DANE
204 NULL, /* hosts_try_dane */
205 NULL, /* hosts_require_dane */
206 #endif
207 #ifndef DISABLE_PRDR
208 US"*", /* hosts_try_prdr */
209 #endif
210 #ifndef DISABLE_OCSP
211 US"*", /* hosts_request_ocsp (except under DANE; tls_client_start()) */
212 NULL, /* hosts_require_ocsp */
213 #endif
214 NULL, /* hosts_require_tls */
215 NULL, /* hosts_avoid_tls */
216 NULL, /* hosts_verify_avoid_tls */
217 NULL, /* hosts_avoid_pipelining */
218 NULL, /* hosts_avoid_esmtp */
219 NULL, /* hosts_nopass_tls */
220 5*60, /* command_timeout */
221 5*60, /* connect_timeout; shorter system default overrides */
222 5*60, /* data timeout */
223 10*60, /* final timeout */
224 1024, /* size_addition */
225 5, /* hosts_max_try */
226 50, /* hosts_max_try_hardlimit */
227 TRUE, /* address_retry_include_sender */
228 FALSE, /* allow_localhost */
229 FALSE, /* authenticated_sender_force */
230 FALSE, /* gethostbyname */
231 TRUE, /* dns_qualify_single */
232 FALSE, /* dns_search_parents */
233 { NULL, NULL }, /* dnssec_domains {request,require} */
234 TRUE, /* delay_after_cutoff */
235 FALSE, /* hosts_override */
236 FALSE, /* hosts_randomize */
237 TRUE, /* keepalive */
238 FALSE, /* lmtp_ignore_quota */
239 NULL, /* expand_retry_include_ip_address */
240 TRUE /* retry_include_ip_address */
241 #ifdef SUPPORT_SOCKS
242 ,NULL /* socks_proxy */
243 #endif
244 #ifdef SUPPORT_TLS
245 ,NULL, /* tls_certificate */
246 NULL, /* tls_crl */
247 NULL, /* tls_privatekey */
248 NULL, /* tls_require_ciphers */
249 NULL, /* tls_sni */
250 US"system", /* tls_verify_certificates */
251 EXIM_CLIENT_DH_DEFAULT_MIN_BITS,
252 /* tls_dh_min_bits */
253 TRUE, /* tls_tempfail_tryclear */
254 NULL, /* tls_verify_hosts */
255 US"*", /* tls_try_verify_hosts */
256 US"*" /* tls_verify_cert_hostnames */
257 #endif
258 #ifndef DISABLE_DKIM
259 , {NULL, /* dkim_canon */
260 NULL, /* dkim_domain */
261 NULL, /* dkim_private_key */
262 NULL, /* dkim_selector */
263 NULL, /* dkim_sign_headers */
264 NULL} /* dkim_strict */
265 #endif
266 };
267
268 /* some DSN flags for use later */
269
270 static int rf_list[] = {rf_notify_never, rf_notify_success,
271 rf_notify_failure, rf_notify_delay };
272
273 static uschar *rf_names[] = { US"NEVER", US"SUCCESS", US"FAILURE", US"DELAY" };
274
275
276
277 /* Local statics */
278
279 static uschar *smtp_command; /* Points to last cmd for error messages */
280 static uschar *mail_command; /* Points to MAIL cmd for error messages */
281 static BOOL update_waiting; /* TRUE to update the "wait" database */
282
283
284 /*************************************************
285 * Setup entry point *
286 *************************************************/
287
288 /* This function is called when the transport is about to be used,
289 but before running it in a sub-process. It is used for two things:
290
291 (1) To set the fallback host list in addresses, when delivering.
292 (2) To pass back the interface, port, protocol, and other options, for use
293 during callout verification.
294
295 Arguments:
296 tblock pointer to the transport instance block
297 addrlist list of addresses about to be transported
298 tf if not NULL, pointer to block in which to return options
299 uid the uid that will be set (not used)
300 gid the gid that will be set (not used)
301 errmsg place for error message (not used)
302
303 Returns: OK always (FAIL, DEFER not used)
304 */
305
306 static int
307 smtp_transport_setup(transport_instance *tblock, address_item *addrlist,
308 transport_feedback *tf, uid_t uid, gid_t gid, uschar **errmsg)
309 {
310 smtp_transport_options_block *ob =
311 (smtp_transport_options_block *)(tblock->options_block);
312
313 errmsg = errmsg; /* Keep picky compilers happy */
314 uid = uid;
315 gid = gid;
316
317 /* Pass back options if required. This interface is getting very messy. */
318
319 if (tf != NULL)
320 {
321 tf->interface = ob->interface;
322 tf->port = ob->port;
323 tf->protocol = ob->protocol;
324 tf->hosts = ob->hosts;
325 tf->hosts_override = ob->hosts_override;
326 tf->hosts_randomize = ob->hosts_randomize;
327 tf->gethostbyname = ob->gethostbyname;
328 tf->qualify_single = ob->dns_qualify_single;
329 tf->search_parents = ob->dns_search_parents;
330 tf->helo_data = ob->helo_data;
331 }
332
333 /* Set the fallback host list for all the addresses that don't have fallback
334 host lists, provided that the local host wasn't present in the original host
335 list. */
336
337 if (!testflag(addrlist, af_local_host_removed))
338 {
339 for (; addrlist != NULL; addrlist = addrlist->next)
340 if (addrlist->fallback_hosts == NULL)
341 addrlist->fallback_hosts = ob->fallback_hostlist;
342 }
343
344 return OK;
345 }
346
347
348
349 /*************************************************
350 * Initialization entry point *
351 *************************************************/
352
353 /* Called for each instance, after its options have been read, to
354 enable consistency checks to be done, or anything else that needs
355 to be set up.
356
357 Argument: pointer to the transport instance block
358 Returns: nothing
359 */
360
361 void
362 smtp_transport_init(transport_instance *tblock)
363 {
364 smtp_transport_options_block *ob =
365 (smtp_transport_options_block *)(tblock->options_block);
366
367 /* Retry_use_local_part defaults FALSE if unset */
368
369 if (tblock->retry_use_local_part == TRUE_UNSET)
370 tblock->retry_use_local_part = FALSE;
371
372 /* Set the default port according to the protocol */
373
374 if (ob->port == NULL)
375 ob->port = (strcmpic(ob->protocol, US"lmtp") == 0)? US"lmtp" :
376 (strcmpic(ob->protocol, US"smtps") == 0)? US"smtps" : US"smtp";
377
378 /* Set up the setup entry point, to be called before subprocesses for this
379 transport. */
380
381 tblock->setup = smtp_transport_setup;
382
383 /* Complain if any of the timeouts are zero. */
384
385 if (ob->command_timeout <= 0 || ob->data_timeout <= 0 ||
386 ob->final_timeout <= 0)
387 log_write(0, LOG_PANIC_DIE|LOG_CONFIG,
388 "command, data, or final timeout value is zero for %s transport",
389 tblock->name);
390
391 /* If hosts_override is set and there are local hosts, set the global
392 flag that stops verify from showing router hosts. */
393
394 if (ob->hosts_override && ob->hosts != NULL) tblock->overrides_hosts = TRUE;
395
396 /* If there are any fallback hosts listed, build a chain of host items
397 for them, but do not do any lookups at this time. */
398
399 host_build_hostlist(&(ob->fallback_hostlist), ob->fallback_hosts, FALSE);
400 }
401
402
403
404
405
406 /*************************************************
407 * Set delivery info into all active addresses *
408 *************************************************/
409
410 /* Only addresses whose status is >= PENDING are relevant. A lesser
411 status means that an address is not currently being processed.
412
413 Arguments:
414 addrlist points to a chain of addresses
415 errno_value to put in each address's errno field
416 msg to put in each address's message field
417 rc to put in each address's transport_return field
418 pass_message if TRUE, set the "pass message" flag in the address
419 host if set, mark addrs as having used this host
420 smtp_greeting from peer
421 helo_response from peer
422
423 If errno_value has the special value ERRNO_CONNECTTIMEOUT, ETIMEDOUT is put in
424 the errno field, and RTEF_CTOUT is ORed into the more_errno field, to indicate
425 this particular type of timeout.
426
427 Returns: nothing
428 */
429
430 static void
431 set_errno(address_item *addrlist, int errno_value, uschar *msg, int rc,
432 BOOL pass_message, host_item * host
433 #ifdef EXPERIMENTAL_DSN_INFO
434 , const uschar * smtp_greeting, const uschar * helo_response
435 #endif
436 )
437 {
438 address_item *addr;
439 int orvalue = 0;
440 if (errno_value == ERRNO_CONNECTTIMEOUT)
441 {
442 errno_value = ETIMEDOUT;
443 orvalue = RTEF_CTOUT;
444 }
445 for (addr = addrlist; addr; addr = addr->next)
446 if (addr->transport_return >= PENDING)
447 {
448 addr->basic_errno = errno_value;
449 addr->more_errno |= orvalue;
450 if (msg != NULL)
451 {
452 addr->message = msg;
453 if (pass_message) setflag(addr, af_pass_message);
454 }
455 addr->transport_return = rc;
456 if (host)
457 {
458 addr->host_used = host;
459 #ifdef EXPERIMENTAL_DSN_INFO
460 if (smtp_greeting)
461 {uschar * s = Ustrchr(smtp_greeting, '\n'); if (s) *s = '\0';}
462 addr->smtp_greeting = smtp_greeting;
463
464 if (helo_response)
465 {uschar * s = Ustrchr(helo_response, '\n'); if (s) *s = '\0';}
466 addr->helo_response = helo_response;
467 #endif
468 }
469 }
470 }
471
472 static void
473 set_errno_nohost(address_item *addrlist, int errno_value, uschar *msg, int rc,
474 BOOL pass_message)
475 {
476 set_errno(addrlist, errno_value, msg, rc, pass_message, NULL
477 #ifdef EXPERIMENTAL_DSN_INFO
478 , NULL, NULL
479 #endif
480 );
481 }
482
483
484 /*************************************************
485 * Check an SMTP response *
486 *************************************************/
487
488 /* This function is given an errno code and the SMTP response buffer
489 to analyse, together with the host identification for generating messages. It
490 sets an appropriate message and puts the first digit of the response code into
491 the yield variable. If no response was actually read, a suitable digit is
492 chosen.
493
494 Arguments:
495 host the current host, to get its name for messages
496 errno_value pointer to the errno value
497 more_errno from the top address for use with ERRNO_FILTER_FAIL
498 buffer the SMTP response buffer
499 yield where to put a one-digit SMTP response code
500 message where to put an errror message
501 pass_message set TRUE if message is an SMTP response
502
503 Returns: TRUE if an SMTP "QUIT" command should be sent, else FALSE
504 */
505
506 static BOOL
507 check_response(host_item *host, int *errno_value, int more_errno,
508 uschar *buffer, int *yield, uschar **message, BOOL *pass_message)
509 {
510 uschar *pl = US"";
511
512 if (smtp_use_pipelining &&
513 (Ustrcmp(smtp_command, "MAIL") == 0 ||
514 Ustrcmp(smtp_command, "RCPT") == 0 ||
515 Ustrcmp(smtp_command, "DATA") == 0))
516 pl = US"pipelined ";
517
518 *yield = '4'; /* Default setting is to give a temporary error */
519
520 /* Handle response timeout */
521
522 if (*errno_value == ETIMEDOUT)
523 {
524 *message = US string_sprintf("SMTP timeout after %s%s",
525 pl, smtp_command);
526 if (transport_count > 0)
527 *message = US string_sprintf("%s (%d bytes written)", *message,
528 transport_count);
529 return FALSE;
530 }
531
532 /* Handle malformed SMTP response */
533
534 if (*errno_value == ERRNO_SMTPFORMAT)
535 {
536 const uschar *malfresp = string_printing(buffer);
537 while (isspace(*malfresp)) malfresp++;
538 *message = *malfresp == 0
539 ? string_sprintf("Malformed SMTP reply (an empty line) "
540 "in response to %s%s", pl, smtp_command)
541 : string_sprintf("Malformed SMTP reply in response to %s%s: %s",
542 pl, smtp_command, malfresp);
543 return FALSE;
544 }
545
546 /* Handle a failed filter process error; can't send QUIT as we mustn't
547 end the DATA. */
548
549 if (*errno_value == ERRNO_FILTER_FAIL)
550 {
551 *message = US string_sprintf("transport filter process failed (%d)%s",
552 more_errno,
553 (more_errno == EX_EXECFAILED)? ": unable to execute command" : "");
554 return FALSE;
555 }
556
557 /* Handle a failed add_headers expansion; can't send QUIT as we mustn't
558 end the DATA. */
559
560 if (*errno_value == ERRNO_CHHEADER_FAIL)
561 {
562 *message =
563 US string_sprintf("failed to expand headers_add or headers_remove: %s",
564 expand_string_message);
565 return FALSE;
566 }
567
568 /* Handle failure to write a complete data block */
569
570 if (*errno_value == ERRNO_WRITEINCOMPLETE)
571 {
572 *message = US string_sprintf("failed to write a data block");
573 return FALSE;
574 }
575
576 #ifdef SUPPORT_I18N
577 /* Handle lack of advertised SMTPUTF8, for international message */
578 if (*errno_value == ERRNO_UTF8_FWD)
579 {
580 *message = US string_sprintf("utf8 support required but not offered for forwarding");
581 DEBUG(D_deliver|D_transport) debug_printf("%s\n", *message);
582 return TRUE;
583 }
584 #endif
585
586 /* Handle error responses from the remote mailer. */
587
588 if (buffer[0] != 0)
589 {
590 const uschar *s = string_printing(buffer);
591 *message = US string_sprintf("SMTP error from remote mail server after %s%s: "
592 "%s", pl, smtp_command, s);
593 *pass_message = TRUE;
594 *yield = buffer[0];
595 return TRUE;
596 }
597
598 /* No data was read. If there is no errno, this must be the EOF (i.e.
599 connection closed) case, which causes deferral. An explicit connection reset
600 error has the same effect. Otherwise, put the host's identity in the message,
601 leaving the errno value to be interpreted as well. In all cases, we have to
602 assume the connection is now dead. */
603
604 if (*errno_value == 0 || *errno_value == ECONNRESET)
605 {
606 *errno_value = ERRNO_SMTPCLOSED;
607 *message = US string_sprintf("Remote host closed connection "
608 "in response to %s%s", pl, smtp_command);
609 }
610 else *message = US string_sprintf("%s [%s]", host->name, host->address);
611
612 return FALSE;
613 }
614
615
616
617 /*************************************************
618 * Write error message to logs *
619 *************************************************/
620
621 /* This writes to the main log and to the message log.
622
623 Arguments:
624 addr the address item containing error information
625 host the current host
626
627 Returns: nothing
628 */
629
630 static void
631 write_logs(address_item *addr, host_item *host)
632 {
633 uschar * message = string_sprintf("H=%s [%s]", host->name, host->address);
634
635 if (LOGGING(outgoing_port))
636 message = string_sprintf("%s:%d", message,
637 host->port == PORT_NONE ? 25 : host->port);
638 if (addr->message)
639 {
640 message = string_sprintf("%s: %s", message, addr->message);
641 if (addr->basic_errno > 0)
642 message = string_sprintf("%s: %s", message, strerror(addr->basic_errno));
643 log_write(0, LOG_MAIN, "%s", message);
644 deliver_msglog("%s %s\n", tod_stamp(tod_log), message);
645 }
646 else
647 {
648 const uschar * s = exim_errstr(addr->basic_errno);
649 log_write(0, LOG_MAIN, "%s %s", message, s);
650 deliver_msglog("%s %s %s\n", tod_stamp(tod_log), message, s);
651 }
652 }
653
654 static void
655 msglog_line(host_item * host, uschar * message)
656 {
657 deliver_msglog("%s H=%s [%s] %s\n", tod_stamp(tod_log),
658 host->name, host->address, message);
659 }
660
661
662
663 #ifndef DISABLE_EVENT
664 /*************************************************
665 * Post-defer action *
666 *************************************************/
667
668 /* This expands an arbitrary per-transport string.
669 It might, for example, be used to write to the database log.
670
671 Arguments:
672 addr the address item containing error information
673 host the current host
674
675 Returns: nothing
676 */
677
678 static void
679 deferred_event_raise(address_item *addr, host_item *host)
680 {
681 uschar * action = addr->transport->event_action;
682 const uschar * save_domain;
683 uschar * save_local;
684
685 if (!action)
686 return;
687
688 save_domain = deliver_domain;
689 save_local = deliver_localpart;
690
691 /*XXX would ip & port already be set up? */
692 deliver_host_address = string_copy(host->address);
693 deliver_host_port = host->port == PORT_NONE ? 25 : host->port;
694 event_defer_errno = addr->basic_errno;
695
696 router_name = addr->router->name;
697 transport_name = addr->transport->name;
698 deliver_domain = addr->domain;
699 deliver_localpart = addr->local_part;
700
701 (void) event_raise(action, US"msg:host:defer",
702 addr->message
703 ? addr->basic_errno > 0
704 ? string_sprintf("%s: %s", addr->message, strerror(addr->basic_errno))
705 : string_copy(addr->message)
706 : addr->basic_errno > 0
707 ? string_copy(US strerror(addr->basic_errno))
708 : NULL);
709
710 deliver_localpart = save_local;
711 deliver_domain = save_domain;
712 router_name = transport_name = NULL;
713 }
714 #endif
715
716 /*************************************************
717 * Synchronize SMTP responses *
718 *************************************************/
719
720 /* This function is called from smtp_deliver() to receive SMTP responses from
721 the server, and match them up with the commands to which they relate. When
722 PIPELINING is not in use, this function is called after every command, and is
723 therefore somewhat over-engineered, but it is simpler to use a single scheme
724 that works both with and without PIPELINING instead of having two separate sets
725 of code.
726
727 The set of commands that are buffered up with pipelining may start with MAIL
728 and may end with DATA; in between are RCPT commands that correspond to the
729 addresses whose status is PENDING_DEFER. All other commands (STARTTLS, AUTH,
730 etc.) are never buffered.
731
732 Errors after MAIL or DATA abort the whole process leaving the response in the
733 buffer. After MAIL, pending responses are flushed, and the original command is
734 re-instated in big_buffer for error messages. For RCPT commands, the remote is
735 permitted to reject some recipient addresses while accepting others. However
736 certain errors clearly abort the whole process. Set the value in
737 transport_return to PENDING_OK if the address is accepted. If there is a
738 subsequent general error, it will get reset accordingly. If not, it will get
739 converted to OK at the end.
740
741 Arguments:
742 addrlist the complete address list
743 include_affixes TRUE if affixes include in RCPT
744 sync_addr ptr to the ptr of the one to start scanning at (updated)
745 host the host we are connected to
746 count the number of responses to read
747 address_retry_
748 include_sender true if 4xx retry is to include the sender it its key
749 pending_MAIL true if the first response is for MAIL
750 pending_DATA 0 if last command sent was not DATA
751 +1 if previously had a good recipient
752 -1 if not previously had a good recipient
753 inblock incoming SMTP block
754 timeout timeout value
755 buffer buffer for reading response
756 buffsize size of buffer
757
758 Returns: 3 if at least one address had 2xx and one had 5xx
759 2 if at least one address had 5xx but none had 2xx
760 1 if at least one host had a 2xx response, but none had 5xx
761 0 no address had 2xx or 5xx but no errors (all 4xx, or just DATA)
762 -1 timeout while reading RCPT response
763 -2 I/O or other non-response error for RCPT
764 -3 DATA or MAIL failed - errno and buffer set
765 */
766
767 static int
768 sync_responses(address_item *addrlist, BOOL include_affixes,
769 address_item **sync_addr, host_item *host, int count,
770 BOOL address_retry_include_sender, BOOL pending_MAIL,
771 int pending_DATA, smtp_inblock *inblock, int timeout, uschar *buffer,
772 int buffsize)
773 {
774 address_item *addr = *sync_addr;
775 int yield = 0;
776
777 /* Handle the response for a MAIL command. On error, reinstate the original
778 command in big_buffer for error message use, and flush any further pending
779 responses before returning, except after I/O errors and timeouts. */
780
781 if (pending_MAIL)
782 {
783 count--;
784 if (!smtp_read_response(inblock, buffer, buffsize, '2', timeout))
785 {
786 Ustrcpy(big_buffer, mail_command); /* Fits, because it came from there! */
787 if (errno == 0 && buffer[0] != 0)
788 {
789 uschar flushbuffer[4096];
790 int save_errno = 0;
791 if (buffer[0] == '4')
792 {
793 save_errno = ERRNO_MAIL4XX;
794 addr->more_errno |= ((buffer[1] - '0')*10 + buffer[2] - '0') << 8;
795 }
796 while (count-- > 0)
797 {
798 if (!smtp_read_response(inblock, flushbuffer, sizeof(flushbuffer),
799 '2', timeout)
800 && (errno != 0 || flushbuffer[0] == 0))
801 break;
802 }
803 errno = save_errno;
804 }
805
806 if (pending_DATA) count--; /* Number of RCPT responses to come */
807 while (count-- > 0) /* Mark any pending addrs with the host used */
808 {
809 while (addr->transport_return != PENDING_DEFER) addr = addr->next;
810 addr->host_used = host;
811 addr = addr->next;
812 }
813 return -3;
814 }
815 }
816
817 if (pending_DATA) count--; /* Number of RCPT responses to come */
818
819 /* Read and handle the required number of RCPT responses, matching each one up
820 with an address by scanning for the next address whose status is PENDING_DEFER.
821 */
822
823 while (count-- > 0)
824 {
825 while (addr->transport_return != PENDING_DEFER) addr = addr->next;
826
827 /* The address was accepted */
828 addr->host_used = host;
829
830 if (smtp_read_response(inblock, buffer, buffsize, '2', timeout))
831 {
832 yield |= 1;
833 addr->transport_return = PENDING_OK;
834
835 /* If af_dr_retry_exists is set, there was a routing delay on this address;
836 ensure that any address-specific retry record is expunged. We do this both
837 for the basic key and for the version that also includes the sender. */
838
839 if (testflag(addr, af_dr_retry_exists))
840 {
841 uschar *altkey = string_sprintf("%s:<%s>", addr->address_retry_key,
842 sender_address);
843 retry_add_item(addr, altkey, rf_delete);
844 retry_add_item(addr, addr->address_retry_key, rf_delete);
845 }
846 }
847
848 /* Timeout while reading the response */
849
850 else if (errno == ETIMEDOUT)
851 {
852 uschar *message = string_sprintf("SMTP timeout after RCPT TO:<%s>",
853 transport_rcpt_address(addr, include_affixes));
854 set_errno_nohost(addrlist, ETIMEDOUT, message, DEFER, FALSE);
855 retry_add_item(addr, addr->address_retry_key, 0);
856 update_waiting = FALSE;
857 return -1;
858 }
859
860 /* Handle other errors in obtaining an SMTP response by returning -1. This
861 will cause all the addresses to be deferred. Restore the SMTP command in
862 big_buffer for which we are checking the response, so the error message
863 makes sense. */
864
865 else if (errno != 0 || buffer[0] == 0)
866 {
867 string_format(big_buffer, big_buffer_size, "RCPT TO:<%s>",
868 transport_rcpt_address(addr, include_affixes));
869 return -2;
870 }
871
872 /* Handle SMTP permanent and temporary response codes. */
873
874 else
875 {
876 addr->message =
877 string_sprintf("SMTP error from remote mail server after RCPT TO:<%s>: "
878 "%s", transport_rcpt_address(addr, include_affixes),
879 string_printing(buffer));
880 setflag(addr, af_pass_message);
881 msglog_line(host, addr->message);
882
883 /* The response was 5xx */
884
885 if (buffer[0] == '5')
886 {
887 addr->transport_return = FAIL;
888 yield |= 2;
889 }
890
891 /* The response was 4xx */
892
893 else
894 {
895 addr->transport_return = DEFER;
896 addr->basic_errno = ERRNO_RCPT4XX;
897 addr->more_errno |= ((buffer[1] - '0')*10 + buffer[2] - '0') << 8;
898
899 #ifndef DISABLE_EVENT
900 event_defer_errno = addr->more_errno;
901 msg_event_raise(US"msg:rcpt:host:defer", addr);
902 #endif
903
904 /* Log temporary errors if there are more hosts to be tried.
905 If not, log this last one in the == line. */
906
907 if (host->next)
908 log_write(0, LOG_MAIN, "H=%s [%s]: %s", host->name, host->address, addr->message);
909
910 #ifndef DISABLE_EVENT
911 else
912 msg_event_raise(US"msg:rcpt:defer", addr);
913 #endif
914
915 /* Do not put this message on the list of those waiting for specific
916 hosts, as otherwise it is likely to be tried too often. */
917
918 update_waiting = FALSE;
919
920 /* Add a retry item for the address so that it doesn't get tried again
921 too soon. If address_retry_include_sender is true, add the sender address
922 to the retry key. */
923
924 if (address_retry_include_sender)
925 {
926 uschar *altkey = string_sprintf("%s:<%s>", addr->address_retry_key,
927 sender_address);
928 retry_add_item(addr, altkey, 0);
929 }
930 else retry_add_item(addr, addr->address_retry_key, 0);
931 }
932 }
933 } /* Loop for next RCPT response */
934
935 /* Update where to start at for the next block of responses, unless we
936 have already handled all the addresses. */
937
938 if (addr != NULL) *sync_addr = addr->next;
939
940 /* Handle a response to DATA. If we have not had any good recipients, either
941 previously or in this block, the response is ignored. */
942
943 if (pending_DATA != 0 &&
944 !smtp_read_response(inblock, buffer, buffsize, '3', timeout))
945 {
946 int code;
947 uschar *msg;
948 BOOL pass_message;
949 if (pending_DATA > 0 || (yield & 1) != 0)
950 {
951 if (errno == 0 && buffer[0] == '4')
952 {
953 errno = ERRNO_DATA4XX;
954 addrlist->more_errno |= ((buffer[1] - '0')*10 + buffer[2] - '0') << 8;
955 }
956 return -3;
957 }
958 (void)check_response(host, &errno, 0, buffer, &code, &msg, &pass_message);
959 DEBUG(D_transport) debug_printf("%s\nerror for DATA ignored: pipelining "
960 "is in use and there were no good recipients\n", msg);
961 }
962
963 /* All responses read and handled; MAIL (if present) received 2xx and DATA (if
964 present) received 3xx. If any RCPTs were handled and yielded anything other
965 than 4xx, yield will be set non-zero. */
966
967 return yield;
968 }
969
970
971
972 /* Do the client side of smtp-level authentication */
973 /*
974 Arguments:
975 buffer EHLO response from server (gets overwritten)
976 addrlist chain of potential addresses to deliver
977 host host to deliver to
978 ob transport options
979 ibp, obp comms channel control blocks
980
981 Returns:
982 OK Success, or failed (but not required): global "smtp_authenticated" set
983 DEFER Failed authentication (and was required)
984 ERROR Internal problem
985
986 FAIL_SEND Failed communications - transmit
987 FAIL - response
988 */
989
990 int
991 smtp_auth(uschar *buffer, unsigned bufsize, address_item *addrlist, host_item *host,
992 smtp_transport_options_block *ob, BOOL is_esmtp,
993 smtp_inblock *ibp, smtp_outblock *obp)
994 {
995 int require_auth;
996 uschar *fail_reason = US"server did not advertise AUTH support";
997
998 smtp_authenticated = FALSE;
999 client_authenticator = client_authenticated_id = client_authenticated_sender = NULL;
1000 require_auth = verify_check_given_host(&ob->hosts_require_auth, host);
1001
1002 if (is_esmtp && !regex_AUTH) regex_AUTH =
1003 regex_must_compile(US"\\n250[\\s\\-]AUTH\\s+([\\-\\w\\s]+)(?:\\n|$)",
1004 FALSE, TRUE);
1005
1006 if (is_esmtp && regex_match_and_setup(regex_AUTH, buffer, 0, -1))
1007 {
1008 uschar *names = string_copyn(expand_nstring[1], expand_nlength[1]);
1009 expand_nmax = -1; /* reset */
1010
1011 /* Must not do this check until after we have saved the result of the
1012 regex match above. */
1013
1014 if (require_auth == OK ||
1015 verify_check_given_host(&ob->hosts_try_auth, host) == OK)
1016 {
1017 auth_instance *au;
1018 fail_reason = US"no common mechanisms were found";
1019
1020 DEBUG(D_transport) debug_printf("scanning authentication mechanisms\n");
1021
1022 /* Scan the configured authenticators looking for one which is configured
1023 for use as a client, which is not suppressed by client_condition, and
1024 whose name matches an authentication mechanism supported by the server.
1025 If one is found, attempt to authenticate by calling its client function.
1026 */
1027
1028 for (au = auths; !smtp_authenticated && au != NULL; au = au->next)
1029 {
1030 uschar *p = names;
1031 if (!au->client ||
1032 (au->client_condition != NULL &&
1033 !expand_check_condition(au->client_condition, au->name,
1034 US"client authenticator")))
1035 {
1036 DEBUG(D_transport) debug_printf("skipping %s authenticator: %s\n",
1037 au->name,
1038 (au->client)? "client_condition is false" :
1039 "not configured as a client");
1040 continue;
1041 }
1042
1043 /* Loop to scan supported server mechanisms */
1044
1045 while (*p != 0)
1046 {
1047 int rc;
1048 int len = Ustrlen(au->public_name);
1049 while (isspace(*p)) p++;
1050
1051 if (strncmpic(au->public_name, p, len) != 0 ||
1052 (p[len] != 0 && !isspace(p[len])))
1053 {
1054 while (*p != 0 && !isspace(*p)) p++;
1055 continue;
1056 }
1057
1058 /* Found data for a listed mechanism. Call its client entry. Set
1059 a flag in the outblock so that data is overwritten after sending so
1060 that reflections don't show it. */
1061
1062 fail_reason = US"authentication attempt(s) failed";
1063 obp->authenticating = TRUE;
1064 rc = (au->info->clientcode)(au, ibp, obp,
1065 ob->command_timeout, buffer, bufsize);
1066 obp->authenticating = FALSE;
1067 DEBUG(D_transport) debug_printf("%s authenticator yielded %d\n",
1068 au->name, rc);
1069
1070 /* A temporary authentication failure must hold up delivery to
1071 this host. After a permanent authentication failure, we carry on
1072 to try other authentication methods. If all fail hard, try to
1073 deliver the message unauthenticated unless require_auth was set. */
1074
1075 switch(rc)
1076 {
1077 case OK:
1078 smtp_authenticated = TRUE; /* stops the outer loop */
1079 client_authenticator = au->name;
1080 if (au->set_client_id != NULL)
1081 client_authenticated_id = expand_string(au->set_client_id);
1082 break;
1083
1084 /* Failure after writing a command */
1085
1086 case FAIL_SEND:
1087 return FAIL_SEND;
1088
1089 /* Failure after reading a response */
1090
1091 case FAIL:
1092 if (errno != 0 || buffer[0] != '5') return FAIL;
1093 log_write(0, LOG_MAIN, "%s authenticator failed H=%s [%s] %s",
1094 au->name, host->name, host->address, buffer);
1095 break;
1096
1097 /* Failure by some other means. In effect, the authenticator
1098 decided it wasn't prepared to handle this case. Typically this
1099 is the result of "fail" in an expansion string. Do we need to
1100 log anything here? Feb 2006: a message is now put in the buffer
1101 if logging is required. */
1102
1103 case CANCELLED:
1104 if (*buffer != 0)
1105 log_write(0, LOG_MAIN, "%s authenticator cancelled "
1106 "authentication H=%s [%s] %s", au->name, host->name,
1107 host->address, buffer);
1108 break;
1109
1110 /* Internal problem, message in buffer. */
1111
1112 case ERROR:
1113 set_errno_nohost(addrlist, ERRNO_AUTHPROB, string_copy(buffer),
1114 DEFER, FALSE);
1115 return ERROR;
1116 }
1117
1118 break; /* If not authenticated, try next authenticator */
1119 } /* Loop for scanning supported server mechanisms */
1120 } /* Loop for further authenticators */
1121 }
1122 }
1123
1124 /* If we haven't authenticated, but are required to, give up. */
1125
1126 if (require_auth == OK && !smtp_authenticated)
1127 {
1128 set_errno_nohost(addrlist, ERRNO_AUTHFAIL,
1129 string_sprintf("authentication required but %s", fail_reason), DEFER,
1130 FALSE);
1131 return DEFER;
1132 }
1133
1134 return OK;
1135 }
1136
1137
1138 /* Construct AUTH appendix string for MAIL TO */
1139 /*
1140 Arguments
1141 buffer to build string
1142 addrlist chain of potential addresses to deliver
1143 ob transport options
1144
1145 Globals smtp_authenticated
1146 client_authenticated_sender
1147 Return True on error, otherwise buffer has (possibly empty) terminated string
1148 */
1149
1150 BOOL
1151 smtp_mail_auth_str(uschar *buffer, unsigned bufsize, address_item *addrlist,
1152 smtp_transport_options_block *ob)
1153 {
1154 uschar *local_authenticated_sender = authenticated_sender;
1155
1156 #ifdef notdef
1157 debug_printf("smtp_mail_auth_str: as<%s> os<%s> SA<%s>\n", authenticated_sender, ob->authenticated_sender, smtp_authenticated?"Y":"N");
1158 #endif
1159
1160 if (ob->authenticated_sender != NULL)
1161 {
1162 uschar *new = expand_string(ob->authenticated_sender);
1163 if (new == NULL)
1164 {
1165 if (!expand_string_forcedfail)
1166 {
1167 uschar *message = string_sprintf("failed to expand "
1168 "authenticated_sender: %s", expand_string_message);
1169 set_errno_nohost(addrlist, ERRNO_EXPANDFAIL, message, DEFER, FALSE);
1170 return TRUE;
1171 }
1172 }
1173 else if (new[0] != 0) local_authenticated_sender = new;
1174 }
1175
1176 /* Add the authenticated sender address if present */
1177
1178 if ((smtp_authenticated || ob->authenticated_sender_force) &&
1179 local_authenticated_sender != NULL)
1180 {
1181 string_format(buffer, bufsize, " AUTH=%s",
1182 auth_xtextencode(local_authenticated_sender,
1183 Ustrlen(local_authenticated_sender)));
1184 client_authenticated_sender = string_copy(local_authenticated_sender);
1185 }
1186 else
1187 *buffer= 0;
1188
1189 return FALSE;
1190 }
1191
1192
1193
1194 #ifdef EXPERIMENTAL_DANE
1195 /* Lookup TLSA record for host/port.
1196 Return: OK success with dnssec; DANE mode
1197 DEFER Do not use this host now, may retry later
1198 FAIL_FORCED No TLSA record; DANE not usable
1199 FAIL Do not use this connection
1200 */
1201
1202 int
1203 tlsa_lookup(const host_item * host, dns_answer * dnsa, BOOL dane_required)
1204 {
1205 /* move this out to host.c given the similarity to dns_lookup() ? */
1206 uschar buffer[300];
1207 const uschar * fullname = buffer;
1208
1209 /* TLSA lookup string */
1210 (void)sprintf(CS buffer, "_%d._tcp.%.256s", host->port, host->name);
1211
1212 switch (dns_lookup(dnsa, buffer, T_TLSA, &fullname))
1213 {
1214 case DNS_SUCCEED:
1215 if (!dns_is_secure(dnsa))
1216 {
1217 log_write(0, LOG_MAIN, "DANE error: TLSA lookup not DNSSEC");
1218 return DEFER;
1219 }
1220 return OK;
1221
1222 case DNS_AGAIN:
1223 return DEFER; /* just defer this TLS'd conn */
1224
1225 case DNS_NOMATCH:
1226 return dane_required ? FAIL : FAIL_FORCED;
1227
1228 default:
1229 case DNS_FAIL:
1230 return dane_required ? FAIL : DEFER;
1231 }
1232 }
1233 #endif
1234
1235
1236
1237 typedef struct smtp_compare_s
1238 {
1239 uschar *current_sender_address;
1240 struct transport_instance *tblock;
1241 } smtp_compare_t;
1242
1243 /*
1244 Create a unique string that identifies this message, it is based on
1245 sender_address, helo_data and tls_certificate if enabled. */
1246
1247 static uschar *
1248 smtp_local_identity(uschar * sender, struct transport_instance * tblock)
1249 {
1250 address_item * addr1;
1251 uschar * if1 = US"";
1252 uschar * helo1 = US"";
1253 #ifdef SUPPORT_TLS
1254 uschar * tlsc1 = US"";
1255 #endif
1256 uschar * save_sender_address = sender_address;
1257 uschar * local_identity = NULL;
1258 smtp_transport_options_block * ob =
1259 (smtp_transport_options_block *)tblock->options_block;
1260
1261 sender_address = sender;
1262
1263 addr1 = deliver_make_addr (sender, TRUE);
1264 deliver_set_expansions(addr1);
1265
1266 if (ob->interface)
1267 if1 = expand_string(ob->interface);
1268
1269 if (ob->helo_data)
1270 helo1 = expand_string(ob->helo_data);
1271
1272 #ifdef SUPPORT_TLS
1273 if (ob->tls_certificate)
1274 tlsc1 = expand_string(ob->tls_certificate);
1275 local_identity = string_sprintf ("%s^%s^%s", if1, helo1, tlsc1);
1276 #else
1277 local_identity = string_sprintf ("%s^%s", if1, helo1);
1278 #endif
1279
1280 deliver_set_expansions(NULL);
1281 sender_address = save_sender_address;
1282
1283 return local_identity;
1284 }
1285
1286
1287
1288 /* This routine is a callback that is called from transport_check_waiting.
1289 This function will evaluate the incoming message versus the previous
1290 message. If the incoming message is using a different local identity then
1291 we will veto this new message. */
1292
1293 static BOOL
1294 smtp_are_same_identities(uschar * message_id, smtp_compare_t * s_compare)
1295 {
1296 uschar * message_local_identity,
1297 * current_local_identity,
1298 * new_sender_address;
1299
1300 current_local_identity =
1301 smtp_local_identity(s_compare->current_sender_address, s_compare->tblock);
1302
1303 if (!(new_sender_address = deliver_get_sender_address(message_id)))
1304 return 0;
1305
1306 message_local_identity =
1307 smtp_local_identity(new_sender_address, s_compare->tblock);
1308
1309 return Ustrcmp(current_local_identity, message_local_identity) == 0;
1310 }
1311
1312
1313
1314 uschar
1315 ehlo_response(uschar * buf, size_t bsize, uschar checks)
1316 {
1317 #ifdef SUPPORT_TLS
1318 if ( checks & PEER_OFFERED_TLS
1319 && pcre_exec(regex_STARTTLS, NULL, CS buf, bsize, 0, PCRE_EOPT, NULL, 0) < 0)
1320 checks &= ~PEER_OFFERED_TLS;
1321 #endif
1322
1323 if ( checks & PEER_OFFERED_IGNQ
1324 && pcre_exec(regex_IGNOREQUOTA, NULL, CS buf, bsize, 0,
1325 PCRE_EOPT, NULL, 0) < 0)
1326 checks &= ~PEER_OFFERED_IGNQ;
1327
1328 #ifndef DISABLE_PRDR
1329 if ( checks & PEER_OFFERED_PRDR
1330 && pcre_exec(regex_PRDR, NULL, CS buf, bsize, 0, PCRE_EOPT, NULL, 0) < 0)
1331 checks &= ~PEER_OFFERED_PRDR;
1332 #endif
1333
1334 #ifdef SUPPORT_I18N
1335 if ( checks & PEER_OFFERED_UTF8
1336 && pcre_exec(regex_UTF8, NULL, CS buf, bsize, 0, PCRE_EOPT, NULL, 0) < 0)
1337 checks &= ~PEER_OFFERED_UTF8;
1338 #endif
1339
1340 if ( checks & PEER_OFFERED_DSN
1341 && pcre_exec(regex_DSN, NULL, CS buf, bsize, 0, PCRE_EOPT, NULL, 0) < 0)
1342 checks &= ~PEER_OFFERED_DSN;
1343
1344 if ( checks & PEER_OFFERED_PIPE
1345 && pcre_exec(regex_PIPELINING, NULL, CS buf, bsize, 0,
1346 PCRE_EOPT, NULL, 0) < 0)
1347 checks &= ~PEER_OFFERED_PIPE;
1348
1349 if ( checks & PEER_OFFERED_SIZE
1350 && pcre_exec(regex_SIZE, NULL, CS buf, bsize, 0, PCRE_EOPT, NULL, 0) < 0)
1351 checks &= ~PEER_OFFERED_SIZE;
1352
1353 return checks;
1354 }
1355
1356
1357 /*************************************************
1358 * Deliver address list to given host *
1359 *************************************************/
1360
1361 /* If continue_hostname is not null, we get here only when continuing to
1362 deliver down an existing channel. The channel was passed as the standard
1363 input. TLS is never active on a passed channel; the previous process always
1364 closes it down before passing the connection on.
1365
1366 Otherwise, we have to make a connection to the remote host, and do the
1367 initial protocol exchange.
1368
1369 When running as an MUA wrapper, if the sender or any recipient is rejected,
1370 temporarily or permanently, we force failure for all recipients.
1371
1372 Arguments:
1373 addrlist chain of potential addresses to deliver; only those whose
1374 transport_return field is set to PENDING_DEFER are currently
1375 being processed; others should be skipped - they have either
1376 been delivered to an earlier host or IP address, or been
1377 failed by one of them.
1378 host host to deliver to
1379 host_af AF_INET or AF_INET6
1380 port default TCP/IP port to use, in host byte order
1381 interface interface to bind to, or NULL
1382 tblock transport instance block
1383 message_defer set TRUE if yield is OK, but all addresses were deferred
1384 because of a non-recipient, non-host failure, that is, a
1385 4xx response to MAIL FROM, DATA, or ".". This is a defer
1386 that is specific to the message.
1387 suppress_tls if TRUE, don't attempt a TLS connection - this is set for
1388 a second attempt after TLS initialization fails
1389
1390 Returns: OK - the connection was made and the delivery attempted;
1391 the result for each address is in its data block.
1392 DEFER - the connection could not be made, or something failed
1393 while setting up the SMTP session, or there was a
1394 non-message-specific error, such as a timeout.
1395 ERROR - a filter command is specified for this transport,
1396 and there was a problem setting it up; OR helo_data
1397 or add_headers or authenticated_sender is specified
1398 for this transport, and the string failed to expand
1399 */
1400
1401 static int
1402 smtp_deliver(address_item *addrlist, host_item *host, int host_af, int port,
1403 uschar *interface, transport_instance *tblock,
1404 BOOL *message_defer, BOOL suppress_tls)
1405 {
1406 address_item *addr;
1407 address_item *sync_addr;
1408 address_item *first_addr = addrlist;
1409 int yield = OK;
1410 int address_count;
1411 int save_errno;
1412 int rc;
1413 time_t start_delivery_time = time(NULL);
1414 smtp_transport_options_block *ob =
1415 (smtp_transport_options_block *)(tblock->options_block);
1416 BOOL lmtp = strcmpic(ob->protocol, US"lmtp") == 0;
1417 BOOL smtps = strcmpic(ob->protocol, US"smtps") == 0;
1418 BOOL ok = FALSE;
1419 BOOL send_rset = TRUE;
1420 BOOL send_quit = TRUE;
1421 BOOL setting_up = TRUE;
1422 BOOL completed_address = FALSE;
1423 BOOL esmtp = TRUE;
1424 BOOL pending_MAIL;
1425 BOOL pass_message = FALSE;
1426 uschar peer_offered = 0; /*XXX should this be handed on cf. tls_offered, smtp_use_dsn ? */
1427 #ifndef DISABLE_PRDR
1428 BOOL prdr_active;
1429 #endif
1430 #ifdef SUPPORT_I18N
1431 BOOL utf8_needed = FALSE;
1432 #endif
1433 BOOL dsn_all_lasthop = TRUE;
1434 #if defined(SUPPORT_TLS) && defined(EXPERIMENTAL_DANE)
1435 BOOL dane = FALSE;
1436 BOOL dane_required = verify_check_given_host(&ob->hosts_require_dane, host) == OK;
1437 dns_answer tlsa_dnsa;
1438 #endif
1439 smtp_inblock inblock;
1440 smtp_outblock outblock;
1441 int max_rcpt = tblock->max_addresses;
1442 uschar *igquotstr = US"";
1443
1444 #ifdef EXPERIMENTAL_DSN_INFO
1445 uschar *smtp_greeting = NULL;
1446 uschar *helo_response = NULL;
1447 #endif
1448 uschar *helo_data = NULL;
1449
1450 uschar *message = NULL;
1451 uschar new_message_id[MESSAGE_ID_LENGTH + 1];
1452 uschar *p;
1453 uschar buffer[4096];
1454 uschar inbuffer[4096];
1455 uschar outbuffer[4096];
1456
1457 suppress_tls = suppress_tls; /* stop compiler warning when no TLS support */
1458
1459 *message_defer = FALSE;
1460 smtp_command = US"initial connection";
1461 if (max_rcpt == 0) max_rcpt = 999999;
1462
1463 /* Set up the buffer for reading SMTP response packets. */
1464
1465 inblock.buffer = inbuffer;
1466 inblock.buffersize = sizeof(inbuffer);
1467 inblock.ptr = inbuffer;
1468 inblock.ptrend = inbuffer;
1469
1470 /* Set up the buffer for holding SMTP commands while pipelining */
1471
1472 outblock.buffer = outbuffer;
1473 outblock.buffersize = sizeof(outbuffer);
1474 outblock.ptr = outbuffer;
1475 outblock.cmd_count = 0;
1476 outblock.authenticating = FALSE;
1477
1478 /* Reset the parameters of a TLS session. */
1479
1480 tls_out.bits = 0;
1481 tls_out.cipher = NULL; /* the one we may use for this transport */
1482 tls_out.ourcert = NULL;
1483 tls_out.peercert = NULL;
1484 tls_out.peerdn = NULL;
1485 #if defined(SUPPORT_TLS) && !defined(USE_GNUTLS)
1486 tls_out.sni = NULL;
1487 #endif
1488 tls_out.ocsp = OCSP_NOT_REQ;
1489
1490 /* Flip the legacy TLS-related variables over to the outbound set in case
1491 they're used in the context of the transport. Don't bother resetting
1492 afterward as we're in a subprocess. */
1493
1494 tls_modify_variables(&tls_out);
1495
1496 #ifndef SUPPORT_TLS
1497 if (smtps)
1498 {
1499 set_errno_nohost(addrlist, ERRNO_TLSFAILURE, US"TLS support not available",
1500 DEFER, FALSE);
1501 return ERROR;
1502 }
1503 #endif
1504
1505 /* Make a connection to the host if this isn't a continued delivery, and handle
1506 the initial interaction and HELO/EHLO/LHLO. Connect timeout errors are handled
1507 specially so they can be identified for retries. */
1508
1509 if (continue_hostname == NULL)
1510 {
1511 /* This puts port into host->port */
1512 inblock.sock = outblock.sock =
1513 smtp_connect(host, host_af, port, interface, ob->connect_timeout, tblock);
1514
1515 if (inblock.sock < 0)
1516 {
1517 set_errno_nohost(addrlist, (errno == ETIMEDOUT)? ERRNO_CONNECTTIMEOUT : errno,
1518 NULL, DEFER, FALSE);
1519 return DEFER;
1520 }
1521
1522 #if defined(SUPPORT_TLS) && defined(EXPERIMENTAL_DANE)
1523 {
1524 tls_out.dane_verified = FALSE;
1525 tls_out.tlsa_usage = 0;
1526
1527 if (host->dnssec == DS_YES)
1528 {
1529 if( dane_required
1530 || verify_check_given_host(&ob->hosts_try_dane, host) == OK
1531 )
1532 switch (rc = tlsa_lookup(host, &tlsa_dnsa, dane_required))
1533 {
1534 case OK: dane = TRUE; break;
1535 case FAIL_FORCED: break;
1536 default: set_errno_nohost(addrlist, ERRNO_DNSDEFER,
1537 string_sprintf("DANE error: tlsa lookup %s",
1538 rc == DEFER ? "DEFER" : "FAIL"),
1539 rc, FALSE);
1540 return rc;
1541 }
1542 }
1543 else if (dane_required)
1544 {
1545 set_errno_nohost(addrlist, ERRNO_DNSDEFER,
1546 string_sprintf("DANE error: %s lookup not DNSSEC", host->name),
1547 FAIL, FALSE);
1548 return FAIL;
1549 }
1550
1551 if (dane)
1552 ob->tls_tempfail_tryclear = FALSE;
1553 }
1554 #endif /*DANE*/
1555
1556 /* Expand the greeting message while waiting for the initial response. (Makes
1557 sense if helo_data contains ${lookup dnsdb ...} stuff). The expansion is
1558 delayed till here so that $sending_interface and $sending_port are set. */
1559
1560 helo_data = expand_string(ob->helo_data);
1561 #ifdef SUPPORT_I18N
1562 if (helo_data)
1563 {
1564 uschar * errstr = NULL;
1565 if ((helo_data = string_domain_utf8_to_alabel(helo_data, &errstr)), errstr)
1566 {
1567 errstr = string_sprintf("failed to expand helo_data: %s", errstr);
1568 set_errno_nohost(addrlist, ERRNO_EXPANDFAIL, errstr, DEFER, FALSE);
1569 yield = DEFER;
1570 goto SEND_QUIT;
1571 }
1572 }
1573 #endif
1574
1575 /* The first thing is to wait for an initial OK response. The dreaded "goto"
1576 is nevertheless a reasonably clean way of programming this kind of logic,
1577 where you want to escape on any error. */
1578
1579 if (!smtps)
1580 {
1581 BOOL good_response = smtp_read_response(&inblock, buffer, sizeof(buffer),
1582 '2', ob->command_timeout);
1583 #ifdef EXPERIMENTAL_DSN_INFO
1584 smtp_greeting = string_copy(buffer);
1585 #endif
1586 if (!good_response) goto RESPONSE_FAILED;
1587
1588 #ifndef DISABLE_EVENT
1589 {
1590 uschar * s;
1591 lookup_dnssec_authenticated = host->dnssec==DS_YES ? US"yes"
1592 : host->dnssec==DS_NO ? US"no" : NULL;
1593 s = event_raise(tblock->event_action, US"smtp:connect", buffer);
1594 if (s)
1595 {
1596 set_errno_nohost(addrlist, ERRNO_EXPANDFAIL,
1597 string_sprintf("deferred by smtp:connect event expansion: %s", s),
1598 DEFER, FALSE);
1599 yield = DEFER;
1600 goto SEND_QUIT;
1601 }
1602 }
1603 #endif
1604
1605 /* Now check if the helo_data expansion went well, and sign off cleanly if
1606 it didn't. */
1607
1608 if (helo_data == NULL)
1609 {
1610 uschar *message = string_sprintf("failed to expand helo_data: %s",
1611 expand_string_message);
1612 set_errno_nohost(addrlist, ERRNO_EXPANDFAIL, message, DEFER, FALSE);
1613 yield = DEFER;
1614 goto SEND_QUIT;
1615 }
1616 }
1617
1618 /** Debugging without sending a message
1619 addrlist->transport_return = DEFER;
1620 goto SEND_QUIT;
1621 **/
1622
1623 /* Errors that occur after this point follow an SMTP command, which is
1624 left in big_buffer by smtp_write_command() for use in error messages. */
1625
1626 smtp_command = big_buffer;
1627
1628 /* Tell the remote who we are...
1629
1630 February 1998: A convention has evolved that ESMTP-speaking MTAs include the
1631 string "ESMTP" in their greeting lines, so make Exim send EHLO if the
1632 greeting is of this form. The assumption was that the far end supports it
1633 properly... but experience shows that there are some that give 5xx responses,
1634 even though the banner includes "ESMTP" (there's a bloody-minded one that
1635 says "ESMTP not spoken here"). Cope with that case.
1636
1637 September 2000: Time has passed, and it seems reasonable now to always send
1638 EHLO at the start. It is also convenient to make the change while installing
1639 the TLS stuff.
1640
1641 July 2003: Joachim Wieland met a broken server that advertises "PIPELINING"
1642 but times out after sending MAIL FROM, RCPT TO and DATA all together. There
1643 would be no way to send out the mails, so there is now a host list
1644 "hosts_avoid_esmtp" that disables ESMTP for special hosts and solves the
1645 PIPELINING problem as well. Maybe it can also be useful to cure other
1646 problems with broken servers.
1647
1648 Exim originally sent "Helo" at this point and ran for nearly a year that way.
1649 Then somebody tried it with a Microsoft mailer... It seems that all other
1650 mailers use upper case for some reason (the RFC is quite clear about case
1651 independence) so, for peace of mind, I gave in. */
1652
1653 esmtp = verify_check_given_host(&ob->hosts_avoid_esmtp, host) != OK;
1654
1655 /* Alas; be careful, since this goto is not an error-out, so conceivably
1656 we might set data between here and the target which we assume to exist
1657 and be usable. I can see this coming back to bite us. */
1658 #ifdef SUPPORT_TLS
1659 if (smtps)
1660 {
1661 tls_offered = TRUE;
1662 suppress_tls = FALSE;
1663 ob->tls_tempfail_tryclear = FALSE;
1664 smtp_command = US"SSL-on-connect";
1665 goto TLS_NEGOTIATE;
1666 }
1667 #endif
1668
1669 if (esmtp)
1670 {
1671 if (smtp_write_command(&outblock, FALSE, "%s %s\r\n",
1672 lmtp? "LHLO" : "EHLO", helo_data) < 0)
1673 goto SEND_FAILED;
1674 if (!smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
1675 ob->command_timeout))
1676 {
1677 if (errno != 0 || buffer[0] == 0 || lmtp)
1678 {
1679 #ifdef EXPERIMENTAL_DSN_INFO
1680 helo_response = string_copy(buffer);
1681 #endif
1682 goto RESPONSE_FAILED;
1683 }
1684 esmtp = FALSE;
1685 }
1686 #ifdef EXPERIMENTAL_DSN_INFO
1687 helo_response = string_copy(buffer);
1688 #endif
1689 }
1690 else
1691 {
1692 DEBUG(D_transport)
1693 debug_printf("not sending EHLO (host matches hosts_avoid_esmtp)\n");
1694 }
1695
1696 if (!esmtp)
1697 {
1698 BOOL good_response;
1699
1700 if (smtp_write_command(&outblock, FALSE, "HELO %s\r\n", helo_data) < 0)
1701 goto SEND_FAILED;
1702 good_response = smtp_read_response(&inblock, buffer, sizeof(buffer),
1703 '2', ob->command_timeout);
1704 #ifdef EXPERIMENTAL_DSN_INFO
1705 helo_response = string_copy(buffer);
1706 #endif
1707 if (!good_response) goto RESPONSE_FAILED;
1708 }
1709
1710 if (esmtp || lmtp)
1711 peer_offered = ehlo_response(buffer, Ustrlen(buffer),
1712 PEER_OFFERED_TLS /* others checked later */
1713 );
1714
1715 /* Set tls_offered if the response to EHLO specifies support for STARTTLS. */
1716
1717 #ifdef SUPPORT_TLS
1718 tls_offered = !!(peer_offered & PEER_OFFERED_TLS);
1719 #endif
1720 }
1721
1722 /* For continuing deliveries down the same channel, the socket is the standard
1723 input, and we don't need to redo EHLO here (but may need to do so for TLS - see
1724 below). Set up the pointer to where subsequent commands will be left, for
1725 error messages. Note that smtp_use_size and smtp_use_pipelining will have been
1726 set from the command line if they were set in the process that passed the
1727 connection on. */
1728
1729 /*XXX continue case needs to propagate DSN_INFO, prob. in deliver.c
1730 as the contine goes via transport_pass_socket() and doublefork and exec.
1731 It does not wait. Unclear how we keep separate host's responses
1732 separate - we could match up by host ip+port as a bodge. */
1733
1734 else
1735 {
1736 inblock.sock = outblock.sock = fileno(stdin);
1737 smtp_command = big_buffer;
1738 host->port = port; /* Record the port that was used */
1739 }
1740
1741 /* If TLS is available on this connection, whether continued or not, attempt to
1742 start up a TLS session, unless the host is in hosts_avoid_tls. If successful,
1743 send another EHLO - the server may give a different answer in secure mode. We
1744 use a separate buffer for reading the response to STARTTLS so that if it is
1745 negative, the original EHLO data is available for subsequent analysis, should
1746 the client not be required to use TLS. If the response is bad, copy the buffer
1747 for error analysis. */
1748
1749 #ifdef SUPPORT_TLS
1750 if ( tls_offered
1751 && !suppress_tls
1752 && verify_check_given_host(&ob->hosts_avoid_tls, host) != OK)
1753 {
1754 uschar buffer2[4096];
1755 if (smtp_write_command(&outblock, FALSE, "STARTTLS\r\n") < 0)
1756 goto SEND_FAILED;
1757
1758 /* If there is an I/O error, transmission of this message is deferred. If
1759 there is a temporary rejection of STARRTLS and tls_tempfail_tryclear is
1760 false, we also defer. However, if there is a temporary rejection of STARTTLS
1761 and tls_tempfail_tryclear is true, or if there is an outright rejection of
1762 STARTTLS, we carry on. This means we will try to send the message in clear,
1763 unless the host is in hosts_require_tls (tested below). */
1764
1765 if (!smtp_read_response(&inblock, buffer2, sizeof(buffer2), '2',
1766 ob->command_timeout))
1767 {
1768 if ( errno != 0
1769 || buffer2[0] == 0
1770 || (buffer2[0] == '4' && !ob->tls_tempfail_tryclear)
1771 )
1772 {
1773 Ustrncpy(buffer, buffer2, sizeof(buffer));
1774 goto RESPONSE_FAILED;
1775 }
1776 }
1777
1778 /* STARTTLS accepted: try to negotiate a TLS session. */
1779
1780 else
1781 TLS_NEGOTIATE:
1782 {
1783 int rc = tls_client_start(inblock.sock, host, addrlist, tblock
1784 # ifdef EXPERIMENTAL_DANE
1785 , dane ? &tlsa_dnsa : NULL
1786 # endif
1787 );
1788
1789 /* TLS negotiation failed; give an error. From outside, this function may
1790 be called again to try in clear on a new connection, if the options permit
1791 it for this host. */
1792
1793 if (rc != OK)
1794 {
1795 # ifdef EXPERIMENTAL_DANE
1796 if (rc == DEFER && dane)
1797 {
1798 log_write(0, LOG_MAIN,
1799 "DANE attempt failed; no TLS connection to %s [%s]",
1800 host->name, host->address);
1801 }
1802 # endif
1803
1804 save_errno = ERRNO_TLSFAILURE;
1805 message = US"failure while setting up TLS session";
1806 send_quit = FALSE;
1807 goto TLS_FAILED;
1808 }
1809
1810 /* TLS session is set up */
1811
1812 for (addr = addrlist; addr; addr = addr->next)
1813 if (addr->transport_return == PENDING_DEFER)
1814 {
1815 addr->cipher = tls_out.cipher;
1816 addr->ourcert = tls_out.ourcert;
1817 addr->peercert = tls_out.peercert;
1818 addr->peerdn = tls_out.peerdn;
1819 addr->ocsp = tls_out.ocsp;
1820 }
1821 }
1822 }
1823
1824 /* if smtps, we'll have smtp_command set to something else; always safe to
1825 reset it here. */
1826 smtp_command = big_buffer;
1827
1828 /* If we started TLS, redo the EHLO/LHLO exchange over the secure channel. If
1829 helo_data is null, we are dealing with a connection that was passed from
1830 another process, and so we won't have expanded helo_data above. We have to
1831 expand it here. $sending_ip_address and $sending_port are set up right at the
1832 start of the Exim process (in exim.c). */
1833
1834 if (tls_out.active >= 0)
1835 {
1836 char *greeting_cmd;
1837 BOOL good_response;
1838
1839 if (helo_data == NULL)
1840 {
1841 helo_data = expand_string(ob->helo_data);
1842 if (helo_data == NULL)
1843 {
1844 uschar *message = string_sprintf("failed to expand helo_data: %s",
1845 expand_string_message);
1846 set_errno_nohost(addrlist, ERRNO_EXPANDFAIL, message, DEFER, FALSE);
1847 yield = DEFER;
1848 goto SEND_QUIT;
1849 }
1850 }
1851
1852 /* For SMTPS we need to wait for the initial OK response. */
1853 if (smtps)
1854 {
1855 good_response = smtp_read_response(&inblock, buffer, sizeof(buffer),
1856 '2', ob->command_timeout);
1857 #ifdef EXPERIMENTAL_DSN_INFO
1858 smtp_greeting = string_copy(buffer);
1859 #endif
1860 if (!good_response) goto RESPONSE_FAILED;
1861 }
1862
1863 if (esmtp)
1864 greeting_cmd = "EHLO";
1865 else
1866 {
1867 greeting_cmd = "HELO";
1868 DEBUG(D_transport)
1869 debug_printf("not sending EHLO (host matches hosts_avoid_esmtp)\n");
1870 }
1871
1872 if (smtp_write_command(&outblock, FALSE, "%s %s\r\n",
1873 lmtp? "LHLO" : greeting_cmd, helo_data) < 0)
1874 goto SEND_FAILED;
1875 good_response = smtp_read_response(&inblock, buffer, sizeof(buffer),
1876 '2', ob->command_timeout);
1877 #ifdef EXPERIMENTAL_DSN_INFO
1878 helo_response = string_copy(buffer);
1879 #endif
1880 if (!good_response) goto RESPONSE_FAILED;
1881 }
1882
1883 /* If the host is required to use a secure channel, ensure that we
1884 have one. */
1885
1886 else if ( smtps
1887 # ifdef EXPERIMENTAL_DANE
1888 || dane
1889 # endif
1890 || verify_check_given_host(&ob->hosts_require_tls, host) == OK
1891 )
1892 {
1893 save_errno = ERRNO_TLSREQUIRED;
1894 message = string_sprintf("a TLS session is required, but %s",
1895 tls_offered ? "an attempt to start TLS failed"
1896 : "the server did not offer TLS support");
1897 goto TLS_FAILED;
1898 }
1899 #endif /*SUPPORT_TLS*/
1900
1901 /* If TLS is active, we have just started it up and re-done the EHLO command,
1902 so its response needs to be analyzed. If TLS is not active and this is a
1903 continued session down a previously-used socket, we haven't just done EHLO, so
1904 we skip this. */
1905
1906 if (continue_hostname == NULL
1907 #ifdef SUPPORT_TLS
1908 || tls_out.active >= 0
1909 #endif
1910 )
1911 {
1912 if (esmtp || lmtp)
1913 peer_offered = ehlo_response(buffer, Ustrlen(buffer),
1914 0 /* no TLS */
1915 | (lmtp && ob->lmtp_ignore_quota ? PEER_OFFERED_IGNQ : 0)
1916 | PEER_OFFERED_PRDR
1917 #ifdef SUPPORT_I18N
1918 | (addrlist->prop.utf8_msg ? PEER_OFFERED_UTF8 : 0)
1919 /*XXX if we hand peercaps on to continued-conn processes,
1920 must not depend on this addr */
1921 #endif
1922 | PEER_OFFERED_DSN
1923 | PEER_OFFERED_PIPE
1924 | (ob->size_addition >= 0 ? PEER_OFFERED_SIZE : 0)
1925 );
1926
1927 /* Set for IGNOREQUOTA if the response to LHLO specifies support and the
1928 lmtp_ignore_quota option was set. */
1929
1930 igquotstr = peer_offered & PEER_OFFERED_IGNQ ? US" IGNOREQUOTA" : US"";
1931
1932 /* If the response to EHLO specified support for the SIZE parameter, note
1933 this, provided size_addition is non-negative. */
1934
1935 smtp_use_size = !!(peer_offered & PEER_OFFERED_SIZE);
1936
1937 /* Note whether the server supports PIPELINING. If hosts_avoid_esmtp matched
1938 the current host, esmtp will be false, so PIPELINING can never be used. If
1939 the current host matches hosts_avoid_pipelining, don't do it. */
1940
1941 smtp_use_pipelining = peer_offered & PEER_OFFERED_PIPE
1942 && verify_check_given_host(&ob->hosts_avoid_pipelining, host) != OK;
1943
1944 DEBUG(D_transport) debug_printf("%susing PIPELINING\n",
1945 smtp_use_pipelining ? "" : "not ");
1946
1947 #ifndef DISABLE_PRDR
1948 if ( peer_offered & PEER_OFFERED_PRDR
1949 && verify_check_given_host(&ob->hosts_try_prdr, host) != OK)
1950 peer_offered &= ~PEER_OFFERED_PRDR;
1951
1952 if (peer_offered & PEER_OFFERED_PRDR)
1953 {DEBUG(D_transport) debug_printf("PRDR usable\n");}
1954 #endif
1955
1956 /* Note if the server supports DSN */
1957 smtp_use_dsn = !!(peer_offered & PEER_OFFERED_DSN);
1958 DEBUG(D_transport) debug_printf("%susing DSN\n", smtp_use_dsn ? "" : "not ");
1959
1960 /* Note if the response to EHLO specifies support for the AUTH extension.
1961 If it has, check that this host is one we want to authenticate to, and do
1962 the business. The host name and address must be available when the
1963 authenticator's client driver is running. */
1964
1965 switch (yield = smtp_auth(buffer, sizeof(buffer), addrlist, host,
1966 ob, esmtp, &inblock, &outblock))
1967 {
1968 default: goto SEND_QUIT;
1969 case OK: break;
1970 case FAIL_SEND: goto SEND_FAILED;
1971 case FAIL: goto RESPONSE_FAILED;
1972 }
1973 }
1974
1975 /* The setting up of the SMTP call is now complete. Any subsequent errors are
1976 message-specific. */
1977
1978 setting_up = FALSE;
1979
1980 #ifdef SUPPORT_I18N
1981 if (addrlist->prop.utf8_msg)
1982 {
1983 utf8_needed = !addrlist->prop.utf8_downcvt
1984 && !addrlist->prop.utf8_downcvt_maybe;
1985 DEBUG(D_transport) if (!utf8_needed) debug_printf("utf8: %s downconvert\n",
1986 addrlist->prop.utf8_downcvt ? "mandatory" : "optional");
1987 }
1988
1989 /* If this is an international message we need the host to speak SMTPUTF8 */
1990 if (utf8_needed && !(peer_offered & PEER_OFFERED_UTF8))
1991 {
1992 errno = ERRNO_UTF8_FWD;
1993 goto RESPONSE_FAILED;
1994 }
1995 #endif
1996
1997 /* If there is a filter command specified for this transport, we can now
1998 set it up. This cannot be done until the identify of the host is known. */
1999
2000 if (tblock->filter_command != NULL)
2001 {
2002 BOOL rc;
2003 uschar buffer[64];
2004 sprintf(CS buffer, "%.50s transport", tblock->name);
2005 rc = transport_set_up_command(&transport_filter_argv, tblock->filter_command,
2006 TRUE, DEFER, addrlist, buffer, NULL);
2007 transport_filter_timeout = tblock->filter_timeout;
2008
2009 /* On failure, copy the error to all addresses, abandon the SMTP call, and
2010 yield ERROR. */
2011
2012 if (!rc)
2013 {
2014 set_errno_nohost(addrlist->next, addrlist->basic_errno, addrlist->message, DEFER,
2015 FALSE);
2016 yield = ERROR;
2017 goto SEND_QUIT;
2018 }
2019 }
2020
2021
2022 /* For messages that have more than the maximum number of envelope recipients,
2023 we want to send several transactions down the same SMTP connection. (See
2024 comments in deliver.c as to how this reconciles, heuristically, with
2025 remote_max_parallel.) This optimization was added to Exim after the following
2026 code was already working. The simplest way to put it in without disturbing the
2027 code was to use a goto to jump back to this point when there is another
2028 transaction to handle. */
2029
2030 SEND_MESSAGE:
2031 sync_addr = first_addr;
2032 address_count = 0;
2033 ok = FALSE;
2034 send_rset = TRUE;
2035 completed_address = FALSE;
2036
2037
2038 /* Initiate a message transfer. If we know the receiving MTA supports the SIZE
2039 qualification, send it, adding something to the message size to allow for
2040 imprecision and things that get added en route. Exim keeps the number of lines
2041 in a message, so we can give an accurate value for the original message, but we
2042 need some additional to handle added headers. (Double "." characters don't get
2043 included in the count.) */
2044
2045 p = buffer;
2046 *p = 0;
2047
2048 if (smtp_use_size)
2049 {
2050 sprintf(CS p, " SIZE=%d", message_size+message_linecount+ob->size_addition);
2051 while (*p) p++;
2052 }
2053
2054 #ifndef DISABLE_PRDR
2055 prdr_active = FALSE;
2056 if (peer_offered & PEER_OFFERED_PRDR)
2057 for (addr = first_addr; addr; addr = addr->next)
2058 if (addr->transport_return == PENDING_DEFER)
2059 {
2060 for (addr = addr->next; addr; addr = addr->next)
2061 if (addr->transport_return == PENDING_DEFER)
2062 { /* at least two recipients to send */
2063 prdr_active = TRUE;
2064 sprintf(CS p, " PRDR"); p += 5;
2065 break;
2066 }
2067 break;
2068 }
2069 #endif
2070
2071 #ifdef SUPPORT_I18N
2072 if ( addrlist->prop.utf8_msg
2073 && !addrlist->prop.utf8_downcvt
2074 && peer_offered & PEER_OFFERED_UTF8
2075 )
2076 sprintf(CS p, " SMTPUTF8"), p += 9;
2077 #endif
2078
2079 /* check if all addresses have lasthop flag */
2080 /* do not send RET and ENVID if true */
2081 for (dsn_all_lasthop = TRUE, addr = first_addr;
2082 address_count < max_rcpt && addr != NULL;
2083 addr = addr->next)
2084 if ((addr->dsn_flags & rf_dsnlasthop) != 1)
2085 {
2086 dsn_all_lasthop = FALSE;
2087 break;
2088 }
2089
2090 /* Add any DSN flags to the mail command */
2091
2092 if (smtp_use_dsn && !dsn_all_lasthop)
2093 {
2094 if (dsn_ret == dsn_ret_hdrs)
2095 {
2096 Ustrcpy(p, " RET=HDRS"); p += 9;
2097 }
2098 else if (dsn_ret == dsn_ret_full)
2099 {
2100 Ustrcpy(p, " RET=FULL"); p += 9;
2101 }
2102 if (dsn_envid != NULL)
2103 {
2104 string_format(p, sizeof(buffer) - (p-buffer), " ENVID=%s", dsn_envid);
2105 while (*p) p++;
2106 }
2107 }
2108
2109 /* If an authenticated_sender override has been specified for this transport
2110 instance, expand it. If the expansion is forced to fail, and there was already
2111 an authenticated_sender for this message, the original value will be used.
2112 Other expansion failures are serious. An empty result is ignored, but there is
2113 otherwise no check - this feature is expected to be used with LMTP and other
2114 cases where non-standard addresses (e.g. without domains) might be required. */
2115
2116 if (smtp_mail_auth_str(p, sizeof(buffer) - (p-buffer), addrlist, ob))
2117 {
2118 yield = ERROR;
2119 goto SEND_QUIT;
2120 }
2121
2122 /* From here until we send the DATA command, we can make use of PIPELINING
2123 if the server host supports it. The code has to be able to check the responses
2124 at any point, for when the buffer fills up, so we write it totally generally.
2125 When PIPELINING is off, each command written reports that it has flushed the
2126 buffer. */
2127
2128 pending_MAIL = TRUE; /* The block starts with MAIL */
2129
2130 {
2131 uschar * s = return_path;
2132 #ifdef SUPPORT_I18N
2133 uschar * errstr = NULL;
2134
2135 /* If we must downconvert, do the from-address here. Remember we had to
2136 for the to-addresses (done below), and also (ugly) for re-doing when building
2137 the delivery log line. */
2138
2139 if ( addrlist->prop.utf8_msg
2140 && (addrlist->prop.utf8_downcvt || !(peer_offered & PEER_OFFERED_UTF8))
2141 )
2142 {
2143 if (s = string_address_utf8_to_alabel(return_path, &errstr), errstr)
2144 {
2145 set_errno_nohost(addrlist, ERRNO_EXPANDFAIL, errstr, DEFER, FALSE);
2146 yield = ERROR;
2147 goto SEND_QUIT;
2148 }
2149 setflag(addrlist, af_utf8_downcvt);
2150 }
2151 #endif
2152
2153 rc = smtp_write_command(&outblock, smtp_use_pipelining,
2154 "MAIL FROM:<%s>%s\r\n", s, buffer);
2155 }
2156
2157 mail_command = string_copy(big_buffer); /* Save for later error message */
2158
2159 switch(rc)
2160 {
2161 case -1: /* Transmission error */
2162 goto SEND_FAILED;
2163
2164 case +1: /* Block was sent */
2165 if (!smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
2166 ob->command_timeout))
2167 {
2168 if (errno == 0 && buffer[0] == '4')
2169 {
2170 errno = ERRNO_MAIL4XX;
2171 addrlist->more_errno |= ((buffer[1] - '0')*10 + buffer[2] - '0') << 8;
2172 }
2173 goto RESPONSE_FAILED;
2174 }
2175 pending_MAIL = FALSE;
2176 break;
2177 }
2178
2179 /* Pass over all the relevant recipient addresses for this host, which are the
2180 ones that have status PENDING_DEFER. If we are using PIPELINING, we can send
2181 several before we have to read the responses for those seen so far. This
2182 checking is done by a subroutine because it also needs to be done at the end.
2183 Send only up to max_rcpt addresses at a time, leaving first_addr pointing to
2184 the next one if not all are sent.
2185
2186 In the MUA wrapper situation, we want to flush the PIPELINING buffer for the
2187 last address because we want to abort if any recipients have any kind of
2188 problem, temporary or permanent. We know that all recipient addresses will have
2189 the PENDING_DEFER status, because only one attempt is ever made, and we know
2190 that max_rcpt will be large, so all addresses will be done at once. */
2191
2192 for (addr = first_addr;
2193 addr && address_count < max_rcpt;
2194 addr = addr->next)
2195 {
2196 int count;
2197 BOOL no_flush;
2198 uschar * rcpt_addr;
2199
2200 addr->dsn_aware = smtp_use_dsn ? dsn_support_yes : dsn_support_no;
2201
2202 if (addr->transport_return != PENDING_DEFER) continue;
2203
2204 address_count++;
2205 no_flush = smtp_use_pipelining && (!mua_wrapper || addr->next);
2206
2207 /* Add any DSN flags to the rcpt command and add to the sent string */
2208
2209 p = buffer;
2210 *p = 0;
2211
2212 if (smtp_use_dsn && !(addr->dsn_flags & rf_dsnlasthop))
2213 {
2214 if ((addr->dsn_flags & rf_dsnflags) != 0)
2215 {
2216 int i;
2217 BOOL first = TRUE;
2218 Ustrcpy(p, " NOTIFY=");
2219 while (*p) p++;
2220 for (i = 0; i < 4; i++)
2221 if ((addr->dsn_flags & rf_list[i]) != 0)
2222 {
2223 if (!first) *p++ = ',';
2224 first = FALSE;
2225 Ustrcpy(p, rf_names[i]);
2226 while (*p) p++;
2227 }
2228 }
2229
2230 if (addr->dsn_orcpt)
2231 {
2232 string_format(p, sizeof(buffer) - (p-buffer), " ORCPT=%s",
2233 addr->dsn_orcpt);
2234 while (*p) p++;
2235 }
2236 }
2237
2238 /* Now send the RCPT command, and process outstanding responses when
2239 necessary. After a timeout on RCPT, we just end the function, leaving the
2240 yield as OK, because this error can often mean that there is a problem with
2241 just one address, so we don't want to delay the host. */
2242
2243 rcpt_addr = transport_rcpt_address(addr, tblock->rcpt_include_affixes);
2244
2245 #ifdef SUPPORT_I18N
2246 {
2247 uschar * dummy_errstr;
2248 if ( testflag(addrlist, af_utf8_downcvt)
2249 && (rcpt_addr = string_address_utf8_to_alabel(rcpt_addr, &dummy_errstr),
2250 dummy_errstr
2251 ) )
2252 {
2253 errno = ERRNO_EXPANDFAIL;
2254 goto SEND_FAILED;
2255 }
2256 }
2257 #endif
2258
2259 count = smtp_write_command(&outblock, no_flush, "RCPT TO:<%s>%s%s\r\n",
2260 rcpt_addr, igquotstr, buffer);
2261
2262 if (count < 0) goto SEND_FAILED;
2263 if (count > 0)
2264 {
2265 switch(sync_responses(first_addr, tblock->rcpt_include_affixes,
2266 &sync_addr, host, count, ob->address_retry_include_sender,
2267 pending_MAIL, 0, &inblock, ob->command_timeout, buffer,
2268 sizeof(buffer)))
2269 {
2270 case 3: ok = TRUE; /* 2xx & 5xx => OK & progress made */
2271 case 2: completed_address = TRUE; /* 5xx (only) => progress made */
2272 break;
2273
2274 case 1: ok = TRUE; /* 2xx (only) => OK, but if LMTP, */
2275 if (!lmtp) completed_address = TRUE; /* can't tell about progress yet */
2276 case 0: /* No 2xx or 5xx, but no probs */
2277 break;
2278
2279 case -1: goto END_OFF; /* Timeout on RCPT */
2280 default: goto RESPONSE_FAILED; /* I/O error, or any MAIL error */
2281 }
2282 pending_MAIL = FALSE; /* Dealt with MAIL */
2283 }
2284 } /* Loop for next address */
2285
2286 /* If we are an MUA wrapper, abort if any RCPTs were rejected, either
2287 permanently or temporarily. We should have flushed and synced after the last
2288 RCPT. */
2289
2290 if (mua_wrapper)
2291 {
2292 address_item *badaddr;
2293 for (badaddr = first_addr; badaddr; badaddr = badaddr->next)
2294 if (badaddr->transport_return != PENDING_OK)
2295 {
2296 /*XXX could we find a better errno than 0 here? */
2297 set_errno_nohost(addrlist, 0, badaddr->message, FAIL,
2298 testflag(badaddr, af_pass_message));
2299 ok = FALSE;
2300 break;
2301 }
2302 }
2303
2304 /* If ok is TRUE, we know we have got at least one good recipient, and must now
2305 send DATA, but if it is FALSE (in the normal, non-wrapper case), we may still
2306 have a good recipient buffered up if we are pipelining. We don't want to waste
2307 time sending DATA needlessly, so we only send it if either ok is TRUE or if we
2308 are pipelining. The responses are all handled by sync_responses(). */
2309
2310 if (ok || (smtp_use_pipelining && !mua_wrapper))
2311 {
2312 int count = smtp_write_command(&outblock, FALSE, "DATA\r\n");
2313 if (count < 0) goto SEND_FAILED;
2314 switch(sync_responses(first_addr, tblock->rcpt_include_affixes, &sync_addr,
2315 host, count, ob->address_retry_include_sender, pending_MAIL,
2316 ok? +1 : -1, &inblock, ob->command_timeout, buffer, sizeof(buffer)))
2317 {
2318 case 3: ok = TRUE; /* 2xx & 5xx => OK & progress made */
2319 case 2: completed_address = TRUE; /* 5xx (only) => progress made */
2320 break;
2321
2322 case 1: ok = TRUE; /* 2xx (only) => OK, but if LMTP, */
2323 if (!lmtp) completed_address = TRUE; /* can't tell about progress yet */
2324 case 0: break; /* No 2xx or 5xx, but no probs */
2325
2326 case -1: goto END_OFF; /* Timeout on RCPT */
2327 default: goto RESPONSE_FAILED; /* I/O error, or any MAIL/DATA error */
2328 }
2329 }
2330
2331 /* Save the first address of the next batch. */
2332
2333 first_addr = addr;
2334
2335 /* If there were no good recipients (but otherwise there have been no
2336 problems), just set ok TRUE, since we have handled address-specific errors
2337 already. Otherwise, it's OK to send the message. Use the check/escape mechanism
2338 for handling the SMTP dot-handling protocol, flagging to apply to headers as
2339 well as body. Set the appropriate timeout value to be used for each chunk.
2340 (Haven't been able to make it work using select() for writing yet.) */
2341
2342 if (!ok)
2343 ok = TRUE;
2344 else
2345 {
2346 sigalrm_seen = FALSE;
2347 transport_write_timeout = ob->data_timeout;
2348 smtp_command = US"sending data block"; /* For error messages */
2349 DEBUG(D_transport|D_v)
2350 debug_printf(" SMTP>> writing message and terminating \".\"\n");
2351 transport_count = 0;
2352
2353 #ifndef DISABLE_DKIM
2354 ok = dkim_transport_write_message(addrlist, inblock.sock,
2355 topt_use_crlf | topt_end_dot | topt_escape_headers |
2356 (tblock->body_only? topt_no_headers : 0) |
2357 (tblock->headers_only? topt_no_body : 0) |
2358 (tblock->return_path_add? topt_add_return_path : 0) |
2359 (tblock->delivery_date_add? topt_add_delivery_date : 0) |
2360 (tblock->envelope_to_add? topt_add_envelope_to : 0),
2361 tblock->add_headers, tblock->remove_headers,
2362 US".", US"..", /* Escaping strings */
2363 tblock->rewrite_rules, tblock->rewrite_existflags,
2364 &ob->dkim
2365 );
2366 #else
2367 ok = transport_write_message(addrlist, inblock.sock,
2368 topt_use_crlf | topt_end_dot | topt_escape_headers |
2369 (tblock->body_only? topt_no_headers : 0) |
2370 (tblock->headers_only? topt_no_body : 0) |
2371 (tblock->return_path_add? topt_add_return_path : 0) |
2372 (tblock->delivery_date_add? topt_add_delivery_date : 0) |
2373 (tblock->envelope_to_add? topt_add_envelope_to : 0),
2374 0, /* No size limit */
2375 tblock->add_headers, tblock->remove_headers,
2376 US".", US"..", /* Escaping strings */
2377 tblock->rewrite_rules, tblock->rewrite_existflags);
2378 #endif
2379
2380 /* transport_write_message() uses write() because it is called from other
2381 places to write to non-sockets. This means that under some OS (e.g. Solaris)
2382 it can exit with "Broken pipe" as its error. This really means that the
2383 socket got closed at the far end. */
2384
2385 transport_write_timeout = 0; /* for subsequent transports */
2386
2387 /* Failure can either be some kind of I/O disaster (including timeout),
2388 or the failure of a transport filter or the expansion of added headers. */
2389
2390 if (!ok)
2391 {
2392 buffer[0] = 0; /* There hasn't been a response */
2393 goto RESPONSE_FAILED;
2394 }
2395
2396 /* We used to send the terminating "." explicitly here, but because of
2397 buffering effects at both ends of TCP/IP connections, you don't gain
2398 anything by keeping it separate, so it might as well go in the final
2399 data buffer for efficiency. This is now done by setting the topt_end_dot
2400 flag above. */
2401
2402 smtp_command = US"end of data";
2403
2404 #ifndef DISABLE_PRDR
2405 /* For PRDR we optionally get a partial-responses warning
2406 * followed by the individual responses, before going on with
2407 * the overall response. If we don't get the warning then deal
2408 * with per non-PRDR. */
2409 if(prdr_active)
2410 {
2411 ok = smtp_read_response(&inblock, buffer, sizeof(buffer), '3',
2412 ob->final_timeout);
2413 if (!ok && errno == 0)
2414 switch(buffer[0])
2415 {
2416 case '2': prdr_active = FALSE;
2417 ok = TRUE;
2418 break;
2419 case '4': errno = ERRNO_DATA4XX;
2420 addrlist->more_errno |= ((buffer[1] - '0')*10 + buffer[2] - '0') << 8;
2421 break;
2422 }
2423 }
2424 else
2425 #endif
2426
2427 /* For non-PRDR SMTP, we now read a single response that applies to the
2428 whole message. If it is OK, then all the addresses have been delivered. */
2429
2430 if (!lmtp)
2431 {
2432 ok = smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
2433 ob->final_timeout);
2434 if (!ok && errno == 0 && buffer[0] == '4')
2435 {
2436 errno = ERRNO_DATA4XX;
2437 addrlist->more_errno |= ((buffer[1] - '0')*10 + buffer[2] - '0') << 8;
2438 }
2439 }
2440
2441 /* For LMTP, we get back a response for every RCPT command that we sent;
2442 some may be accepted and some rejected. For those that get a response, their
2443 status is fixed; any that are accepted have been handed over, even if later
2444 responses crash - at least, that's how I read RFC 2033.
2445
2446 If all went well, mark the recipient addresses as completed, record which
2447 host/IPaddress they were delivered to, and cut out RSET when sending another
2448 message down the same channel. Write the completed addresses to the journal
2449 now so that they are recorded in case there is a crash of hardware or
2450 software before the spool gets updated. Also record the final SMTP
2451 confirmation if needed (for SMTP only). */
2452
2453 if (ok)
2454 {
2455 int flag = '=';
2456 int delivery_time = (int)(time(NULL) - start_delivery_time);
2457 int len;
2458 uschar *conf = NULL;
2459 send_rset = FALSE;
2460
2461 /* Set up confirmation if needed - applies only to SMTP */
2462
2463 if (
2464 #ifdef DISABLE_EVENT
2465 LOGGING(smtp_confirmation) &&
2466 #endif
2467 !lmtp
2468 )
2469 {
2470 const uschar *s = string_printing(buffer);
2471 /* deconst cast ok here as string_printing was checked to have alloc'n'copied */
2472 conf = (s == buffer)? (uschar *)string_copy(s) : US s;
2473 }
2474
2475 /* Process all transported addresses - for LMTP or PRDR, read a status for
2476 each one. */
2477
2478 for (addr = addrlist; addr != first_addr; addr = addr->next)
2479 {
2480 if (addr->transport_return != PENDING_OK) continue;
2481
2482 /* LMTP - if the response fails badly (e.g. timeout), use it for all the
2483 remaining addresses. Otherwise, it's a return code for just the one
2484 address. For temporary errors, add a retry item for the address so that
2485 it doesn't get tried again too soon. */
2486
2487 #ifndef DISABLE_PRDR
2488 if (lmtp || prdr_active)
2489 #else
2490 if (lmtp)
2491 #endif
2492 {
2493 if (!smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
2494 ob->final_timeout))
2495 {
2496 if (errno != 0 || buffer[0] == 0) goto RESPONSE_FAILED;
2497 addr->message = string_sprintf(
2498 #ifndef DISABLE_PRDR
2499 "%s error after %s: %s", prdr_active ? "PRDR":"LMTP",
2500 #else
2501 "LMTP error after %s: %s",
2502 #endif
2503 big_buffer, string_printing(buffer));
2504 setflag(addr, af_pass_message); /* Allow message to go to user */
2505 if (buffer[0] == '5')
2506 addr->transport_return = FAIL;
2507 else
2508 {
2509 errno = ERRNO_DATA4XX;
2510 addr->more_errno |= ((buffer[1] - '0')*10 + buffer[2] - '0') << 8;
2511 addr->transport_return = DEFER;
2512 #ifndef DISABLE_PRDR
2513 if (!prdr_active)
2514 #endif
2515 retry_add_item(addr, addr->address_retry_key, 0);
2516 }
2517 continue;
2518 }
2519 completed_address = TRUE; /* NOW we can set this flag */
2520 if (LOGGING(smtp_confirmation))
2521 {
2522 const uschar *s = string_printing(buffer);
2523 /* deconst cast ok here as string_printing was checked to have alloc'n'copied */
2524 conf = (s == buffer)? (uschar *)string_copy(s) : US s;
2525 }
2526 }
2527
2528 /* SMTP, or success return from LMTP for this address. Pass back the
2529 actual host that was used. */
2530
2531 addr->transport_return = OK;
2532 addr->more_errno = delivery_time;
2533 addr->host_used = host;
2534 addr->special_action = flag;
2535 addr->message = conf;
2536 #ifndef DISABLE_PRDR
2537 if (prdr_active) addr->flags |= af_prdr_used;
2538 #endif
2539 flag = '-';
2540
2541 #ifndef DISABLE_PRDR
2542 if (!prdr_active)
2543 #endif
2544 {
2545 /* Update the journal. For homonymic addresses, use the base address plus
2546 the transport name. See lots of comments in deliver.c about the reasons
2547 for the complications when homonyms are involved. Just carry on after
2548 write error, as it may prove possible to update the spool file later. */
2549
2550 if (testflag(addr, af_homonym))
2551 sprintf(CS buffer, "%.500s/%s\n", addr->unique + 3, tblock->name);
2552 else
2553 sprintf(CS buffer, "%.500s\n", addr->unique);
2554
2555 DEBUG(D_deliver) debug_printf("journalling %s\n", buffer);
2556 len = Ustrlen(CS buffer);
2557 if (write(journal_fd, buffer, len) != len)
2558 log_write(0, LOG_MAIN|LOG_PANIC, "failed to write journal for "
2559 "%s: %s", buffer, strerror(errno));
2560 }
2561 }
2562
2563 #ifndef DISABLE_PRDR
2564 if (prdr_active)
2565 {
2566 /* PRDR - get the final, overall response. For any non-success
2567 upgrade all the address statuses. */
2568 ok = smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
2569 ob->final_timeout);
2570 if (!ok)
2571 {
2572 if(errno == 0 && buffer[0] == '4')
2573 {
2574 errno = ERRNO_DATA4XX;
2575 addrlist->more_errno |= ((buffer[1] - '0')*10 + buffer[2] - '0') << 8;
2576 }
2577 for (addr = addrlist; addr != first_addr; addr = addr->next)
2578 if (buffer[0] == '5' || addr->transport_return == OK)
2579 addr->transport_return = PENDING_OK; /* allow set_errno action */
2580 goto RESPONSE_FAILED;
2581 }
2582
2583 /* Update the journal, or setup retry. */
2584 for (addr = addrlist; addr != first_addr; addr = addr->next)
2585 if (addr->transport_return == OK)
2586 {
2587 if (testflag(addr, af_homonym))
2588 sprintf(CS buffer, "%.500s/%s\n", addr->unique + 3, tblock->name);
2589 else
2590 sprintf(CS buffer, "%.500s\n", addr->unique);
2591
2592 DEBUG(D_deliver) debug_printf("journalling(PRDR) %s\n", buffer);
2593 len = Ustrlen(CS buffer);
2594 if (write(journal_fd, buffer, len) != len)
2595 log_write(0, LOG_MAIN|LOG_PANIC, "failed to write journal for "
2596 "%s: %s", buffer, strerror(errno));
2597 }
2598 else if (addr->transport_return == DEFER)
2599 retry_add_item(addr, addr->address_retry_key, -2);
2600 }
2601 #endif
2602
2603 /* Ensure the journal file is pushed out to disk. */
2604
2605 if (EXIMfsync(journal_fd) < 0)
2606 log_write(0, LOG_MAIN|LOG_PANIC, "failed to fsync journal: %s",
2607 strerror(errno));
2608 }
2609 }
2610
2611
2612 /* Handle general (not specific to one address) failures here. The value of ok
2613 is used to skip over this code on the falling through case. A timeout causes a
2614 deferral. Other errors may defer or fail according to the response code, and
2615 may set up a special errno value, e.g. after connection chopped, which is
2616 assumed if errno == 0 and there is no text in the buffer. If control reaches
2617 here during the setting up phase (i.e. before MAIL FROM) then always defer, as
2618 the problem is not related to this specific message. */
2619
2620 if (!ok)
2621 {
2622 int code, set_rc;
2623 uschar * set_message;
2624
2625 RESPONSE_FAILED:
2626 {
2627 save_errno = errno;
2628 message = NULL;
2629 send_quit = check_response(host, &save_errno, addrlist->more_errno,
2630 buffer, &code, &message, &pass_message);
2631 goto FAILED;
2632 }
2633
2634 SEND_FAILED:
2635 {
2636 save_errno = errno;
2637 code = '4';
2638 message = US string_sprintf("send() to %s [%s] failed: %s",
2639 host->name, host->address, strerror(save_errno));
2640 send_quit = FALSE;
2641 goto FAILED;
2642 }
2643
2644 /* This label is jumped to directly when a TLS negotiation has failed,
2645 or was not done for a host for which it is required. Values will be set
2646 in message and save_errno, and setting_up will always be true. Treat as
2647 a temporary error. */
2648
2649 #ifdef SUPPORT_TLS
2650 TLS_FAILED:
2651 code = '4';
2652 #endif
2653
2654 /* If the failure happened while setting up the call, see if the failure was
2655 a 5xx response (this will either be on connection, or following HELO - a 5xx
2656 after EHLO causes it to try HELO). If so, fail all addresses, as this host is
2657 never going to accept them. For other errors during setting up (timeouts or
2658 whatever), defer all addresses, and yield DEFER, so that the host is not
2659 tried again for a while. */
2660
2661 FAILED:
2662 ok = FALSE; /* For when reached by GOTO */
2663 set_message = message;
2664
2665 if (setting_up)
2666 {
2667 if (code == '5')
2668 set_rc = FAIL;
2669 else
2670 yield = set_rc = DEFER;
2671 }
2672
2673 /* We want to handle timeouts after MAIL or "." and loss of connection after
2674 "." specially. They can indicate a problem with the sender address or with
2675 the contents of the message rather than a real error on the connection. These
2676 cases are treated in the same way as a 4xx response. This next bit of code
2677 does the classification. */
2678
2679 else
2680 {
2681 BOOL message_error;
2682
2683 switch(save_errno)
2684 {
2685 #ifdef SUPPORT_I18N
2686 case ERRNO_UTF8_FWD:
2687 code = '5';
2688 /*FALLTHROUGH*/
2689 #endif
2690 case 0:
2691 case ERRNO_MAIL4XX:
2692 case ERRNO_DATA4XX:
2693 message_error = TRUE;
2694 break;
2695
2696 case ETIMEDOUT:
2697 message_error = Ustrncmp(smtp_command,"MAIL",4) == 0 ||
2698 Ustrncmp(smtp_command,"end ",4) == 0;
2699 break;
2700
2701 case ERRNO_SMTPCLOSED:
2702 message_error = Ustrncmp(smtp_command,"end ",4) == 0;
2703 break;
2704
2705 default:
2706 message_error = FALSE;
2707 break;
2708 }
2709
2710 /* Handle the cases that are treated as message errors. These are:
2711
2712 (a) negative response or timeout after MAIL
2713 (b) negative response after DATA
2714 (c) negative response or timeout or dropped connection after "."
2715 (d) utf8 support required and not offered
2716
2717 It won't be a negative response or timeout after RCPT, as that is dealt
2718 with separately above. The action in all cases is to set an appropriate
2719 error code for all the addresses, but to leave yield set to OK because the
2720 host itself has not failed. Of course, it might in practice have failed
2721 when we've had a timeout, but if so, we'll discover that at the next
2722 delivery attempt. For a temporary error, set the message_defer flag, and
2723 write to the logs for information if this is not the last host. The error
2724 for the last host will be logged as part of the address's log line. */
2725
2726 if (message_error)
2727 {
2728 if (mua_wrapper) code = '5'; /* Force hard failure in wrapper mode */
2729
2730 /* If there's an errno, the message contains just the identity of
2731 the host. */
2732
2733 if (code == '5')
2734 set_rc = FAIL;
2735 else /* Anything other than 5 is treated as temporary */
2736 {
2737 set_rc = DEFER;
2738 if (save_errno > 0)
2739 message = US string_sprintf("%s: %s", message, strerror(save_errno));
2740 if (host->next != NULL) log_write(0, LOG_MAIN, "%s", message);
2741 msglog_line(host, message);
2742 *message_defer = TRUE;
2743 }
2744 }
2745
2746 /* Otherwise, we have an I/O error or a timeout other than after MAIL or
2747 ".", or some other transportation error. We defer all addresses and yield
2748 DEFER, except for the case of failed add_headers expansion, or a transport
2749 filter failure, when the yield should be ERROR, to stop it trying other
2750 hosts. */
2751
2752 else
2753 {
2754 set_rc = DEFER;
2755 yield = (save_errno == ERRNO_CHHEADER_FAIL ||
2756 save_errno == ERRNO_FILTER_FAIL)? ERROR : DEFER;
2757 }
2758 }
2759
2760 set_errno(addrlist, save_errno, set_message, set_rc, pass_message, host
2761 #ifdef EXPERIMENTAL_DSN_INFO
2762 , smtp_greeting, helo_response
2763 #endif
2764 );
2765 }
2766
2767
2768 /* If all has gone well, send_quit will be set TRUE, implying we can end the
2769 SMTP session tidily. However, if there were too many addresses to send in one
2770 message (indicated by first_addr being non-NULL) we want to carry on with the
2771 rest of them. Also, it is desirable to send more than one message down the SMTP
2772 connection if there are several waiting, provided we haven't already sent so
2773 many as to hit the configured limit. The function transport_check_waiting looks
2774 for a waiting message and returns its id. Then transport_pass_socket tries to
2775 set up a continued delivery by passing the socket on to another process. The
2776 variable send_rset is FALSE if a message has just been successfully transfered.
2777
2778 If we are already sending down a continued channel, there may be further
2779 addresses not yet delivered that are aimed at the same host, but which have not
2780 been passed in this run of the transport. In this case, continue_more will be
2781 true, and all we should do is send RSET if necessary, and return, leaving the
2782 channel open.
2783
2784 However, if no address was disposed of, i.e. all addresses got 4xx errors, we
2785 do not want to continue with other messages down the same channel, because that
2786 can lead to looping between two or more messages, all with the same,
2787 temporarily failing address(es). [The retry information isn't updated yet, so
2788 new processes keep on trying.] We probably also don't want to try more of this
2789 message's addresses either.
2790
2791 If we have started a TLS session, we have to end it before passing the
2792 connection to a new process. However, not all servers can handle this (Exim
2793 can), so we do not pass such a connection on if the host matches
2794 hosts_nopass_tls. */
2795
2796 DEBUG(D_transport)
2797 debug_printf("ok=%d send_quit=%d send_rset=%d continue_more=%d "
2798 "yield=%d first_address is %sNULL\n", ok, send_quit, send_rset,
2799 continue_more, yield, (first_addr == NULL)? "":"not ");
2800
2801 if (completed_address && ok && send_quit)
2802 {
2803 BOOL more;
2804 smtp_compare_t t_compare;
2805
2806 t_compare.tblock = tblock;
2807 t_compare.current_sender_address = sender_address;
2808
2809 if ( first_addr != NULL
2810 || continue_more
2811 || ( ( tls_out.active < 0
2812 || verify_check_given_host(&ob->hosts_nopass_tls, host) != OK
2813 )
2814 &&
2815 transport_check_waiting(tblock->name, host->name,
2816 tblock->connection_max_messages, new_message_id, &more,
2817 (oicf)smtp_are_same_identities, (void*)&t_compare)
2818 ) )
2819 {
2820 uschar *msg;
2821 BOOL pass_message;
2822
2823 if (send_rset)
2824 {
2825 if (! (ok = smtp_write_command(&outblock, FALSE, "RSET\r\n") >= 0))
2826 {
2827 msg = US string_sprintf("send() to %s [%s] failed: %s", host->name,
2828 host->address, strerror(save_errno));
2829 send_quit = FALSE;
2830 }
2831 else if (! (ok = smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
2832 ob->command_timeout)))
2833 {
2834 int code;
2835 send_quit = check_response(host, &errno, 0, buffer, &code, &msg,
2836 &pass_message);
2837 if (!send_quit)
2838 {
2839 DEBUG(D_transport) debug_printf("H=%s [%s] %s\n",
2840 host->name, host->address, msg);
2841 }
2842 }
2843 }
2844
2845 /* Either RSET was not needed, or it succeeded */
2846
2847 if (ok)
2848 {
2849 if (first_addr != NULL) /* More addresses still to be sent */
2850 { /* in this run of the transport */
2851 continue_sequence++; /* Causes * in logging */
2852 goto SEND_MESSAGE;
2853 }
2854 if (continue_more) return yield; /* More addresses for another run */
2855
2856 /* Pass the socket to a new Exim process. Before doing so, we must shut
2857 down TLS. Not all MTAs allow for the continuation of the SMTP session
2858 when TLS is shut down. We test for this by sending a new EHLO. If we
2859 don't get a good response, we don't attempt to pass the socket on. */
2860
2861 #ifdef SUPPORT_TLS
2862 if (tls_out.active >= 0)
2863 {
2864 tls_close(FALSE, TRUE);
2865 if (smtps)
2866 ok = FALSE;
2867 else
2868 ok = smtp_write_command(&outblock,FALSE,"EHLO %s\r\n",helo_data) >= 0 &&
2869 smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
2870 ob->command_timeout);
2871 }
2872 #endif
2873
2874 /* If the socket is successfully passed, we musn't send QUIT (or
2875 indeed anything!) from here. */
2876
2877 /*XXX DSN_INFO: assume likely to do new HELO; but for greet we'll want to
2878 propagate it from the initial
2879 */
2880 if (ok && transport_pass_socket(tblock->name, host->name, host->address,
2881 new_message_id, inblock.sock))
2882 {
2883 send_quit = FALSE;
2884 }
2885 }
2886
2887 /* If RSET failed and there are addresses left, they get deferred. */
2888
2889 else set_errno(first_addr, errno, msg, DEFER, FALSE, host
2890 #ifdef EXPERIMENTAL_DSN_INFO
2891 , smtp_greeting, helo_response
2892 #endif
2893 );
2894 }
2895 }
2896
2897 /* End off tidily with QUIT unless the connection has died or the socket has
2898 been passed to another process. There has been discussion on the net about what
2899 to do after sending QUIT. The wording of the RFC suggests that it is necessary
2900 to wait for a response, but on the other hand, there isn't anything one can do
2901 with an error response, other than log it. Exim used to do that. However,
2902 further discussion suggested that it is positively advantageous not to wait for
2903 the response, but to close the session immediately. This is supposed to move
2904 the TCP/IP TIME_WAIT state from the server to the client, thereby removing some
2905 load from the server. (Hosts that are both servers and clients may not see much
2906 difference, of course.) Further discussion indicated that this was safe to do
2907 on Unix systems which have decent implementations of TCP/IP that leave the
2908 connection around for a while (TIME_WAIT) after the application has gone away.
2909 This enables the response sent by the server to be properly ACKed rather than
2910 timed out, as can happen on broken TCP/IP implementations on other OS.
2911
2912 This change is being made on 31-Jul-98. After over a year of trouble-free
2913 operation, the old commented-out code was removed on 17-Sep-99. */
2914
2915 SEND_QUIT:
2916 if (send_quit) (void)smtp_write_command(&outblock, FALSE, "QUIT\r\n");
2917
2918 END_OFF:
2919
2920 #ifdef SUPPORT_TLS
2921 tls_close(FALSE, TRUE);
2922 #endif
2923
2924 /* Close the socket, and return the appropriate value, first setting
2925 works because the NULL setting is passed back to the calling process, and
2926 remote_max_parallel is forced to 1 when delivering over an existing connection,
2927
2928 If all went well and continue_more is set, we shouldn't actually get here if
2929 there are further addresses, as the return above will be taken. However,
2930 writing RSET might have failed, or there may be other addresses whose hosts are
2931 specified in the transports, and therefore not visible at top level, in which
2932 case continue_more won't get set. */
2933
2934 HDEBUG(D_transport|D_acl|D_v) debug_printf(" SMTP(close)>>\n");
2935 (void)close(inblock.sock);
2936
2937 #ifndef DISABLE_EVENT
2938 (void) event_raise(tblock->event_action, US"tcp:close", NULL);
2939 #endif
2940
2941 continue_transport = NULL;
2942 continue_hostname = NULL;
2943 return yield;
2944 }
2945
2946
2947
2948
2949 /*************************************************
2950 * Closedown entry point *
2951 *************************************************/
2952
2953 /* This function is called when exim is passed an open smtp channel
2954 from another incarnation, but the message which it has been asked
2955 to deliver no longer exists. The channel is on stdin.
2956
2957 We might do fancy things like looking for another message to send down
2958 the channel, but if the one we sought has gone, it has probably been
2959 delivered by some other process that itself will seek further messages,
2960 so just close down our connection.
2961
2962 Argument: pointer to the transport instance block
2963 Returns: nothing
2964 */
2965
2966 void
2967 smtp_transport_closedown(transport_instance *tblock)
2968 {
2969 smtp_transport_options_block *ob =
2970 (smtp_transport_options_block *)(tblock->options_block);
2971 smtp_inblock inblock;
2972 smtp_outblock outblock;
2973 uschar buffer[256];
2974 uschar inbuffer[4096];
2975 uschar outbuffer[16];
2976
2977 inblock.sock = fileno(stdin);
2978 inblock.buffer = inbuffer;
2979 inblock.buffersize = sizeof(inbuffer);
2980 inblock.ptr = inbuffer;
2981 inblock.ptrend = inbuffer;
2982
2983 outblock.sock = inblock.sock;
2984 outblock.buffersize = sizeof(outbuffer);
2985 outblock.buffer = outbuffer;
2986 outblock.ptr = outbuffer;
2987 outblock.cmd_count = 0;
2988 outblock.authenticating = FALSE;
2989
2990 (void)smtp_write_command(&outblock, FALSE, "QUIT\r\n");
2991 (void)smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
2992 ob->command_timeout);
2993 (void)close(inblock.sock);
2994 }
2995
2996
2997
2998 /*************************************************
2999 * Prepare addresses for delivery *
3000 *************************************************/
3001
3002 /* This function is called to flush out error settings from previous delivery
3003 attempts to other hosts. It also records whether we got here via an MX record
3004 or not in the more_errno field of the address. We are interested only in
3005 addresses that are still marked DEFER - others may have got delivered to a
3006 previously considered IP address. Set their status to PENDING_DEFER to indicate
3007 which ones are relevant this time.
3008
3009 Arguments:
3010 addrlist the list of addresses
3011 host the host we are delivering to
3012
3013 Returns: the first address for this delivery
3014 */
3015
3016 static address_item *
3017 prepare_addresses(address_item *addrlist, host_item *host)
3018 {
3019 address_item *first_addr = NULL;
3020 address_item *addr;
3021 for (addr = addrlist; addr != NULL; addr = addr->next)
3022 if (addr->transport_return == DEFER)
3023 {
3024 if (first_addr == NULL) first_addr = addr;
3025 addr->transport_return = PENDING_DEFER;
3026 addr->basic_errno = 0;
3027 addr->more_errno = (host->mx >= 0)? 'M' : 'A';
3028 addr->message = NULL;
3029 #ifdef SUPPORT_TLS
3030 addr->cipher = NULL;
3031 addr->ourcert = NULL;
3032 addr->peercert = NULL;
3033 addr->peerdn = NULL;
3034 addr->ocsp = OCSP_NOT_REQ;
3035 #endif
3036 #ifdef EXPERIMENTAL_DSN_INFO
3037 addr->smtp_greeting = NULL;
3038 addr->helo_response = NULL;
3039 #endif
3040 }
3041 return first_addr;
3042 }
3043
3044
3045
3046 /*************************************************
3047 * Main entry point *
3048 *************************************************/
3049
3050 /* See local README for interface details. As this is a remote transport, it is
3051 given a chain of addresses to be delivered in one connection, if possible. It
3052 always returns TRUE, indicating that each address has its own independent
3053 status set, except if there is a setting up problem, in which case it returns
3054 FALSE. */
3055
3056 BOOL
3057 smtp_transport_entry(
3058 transport_instance *tblock, /* data for this instantiation */
3059 address_item *addrlist) /* addresses we are working on */
3060 {
3061 int cutoff_retry;
3062 int port;
3063 int hosts_defer = 0;
3064 int hosts_fail = 0;
3065 int hosts_looked_up = 0;
3066 int hosts_retry = 0;
3067 int hosts_serial = 0;
3068 int hosts_total = 0;
3069 int total_hosts_tried = 0;
3070 address_item *addr;
3071 BOOL expired = TRUE;
3072 BOOL continuing = continue_hostname != NULL;
3073 uschar *expanded_hosts = NULL;
3074 uschar *pistring;
3075 uschar *tid = string_sprintf("%s transport", tblock->name);
3076 smtp_transport_options_block *ob =
3077 (smtp_transport_options_block *)(tblock->options_block);
3078 host_item *hostlist = addrlist->host_list;
3079 host_item *host = NULL;
3080
3081 DEBUG(D_transport)
3082 {
3083 debug_printf("%s transport entered\n", tblock->name);
3084 for (addr = addrlist; addr != NULL; addr = addr->next)
3085 debug_printf(" %s\n", addr->address);
3086 if (continuing) debug_printf("already connected to %s [%s]\n",
3087 continue_hostname, continue_host_address);
3088 }
3089
3090 /* Set the flag requesting that these hosts be added to the waiting
3091 database if the delivery fails temporarily or if we are running with
3092 queue_smtp or a 2-stage queue run. This gets unset for certain
3093 kinds of error, typically those that are specific to the message. */
3094
3095 update_waiting = TRUE;
3096
3097 /* If a host list is not defined for the addresses - they must all have the
3098 same one in order to be passed to a single transport - or if the transport has
3099 a host list with hosts_override set, use the host list supplied with the
3100 transport. It is an error for this not to exist. */
3101
3102 if (hostlist == NULL || (ob->hosts_override && ob->hosts != NULL))
3103 {
3104 if (ob->hosts == NULL)
3105 {
3106 addrlist->message = string_sprintf("%s transport called with no hosts set",
3107 tblock->name);
3108 addrlist->transport_return = PANIC;
3109 return FALSE; /* Only top address has status */
3110 }
3111
3112 DEBUG(D_transport) debug_printf("using the transport's hosts: %s\n",
3113 ob->hosts);
3114
3115 /* If the transport's host list contains no '$' characters, and we are not
3116 randomizing, it is fixed and therefore a chain of hosts can be built once
3117 and for all, and remembered for subsequent use by other calls to this
3118 transport. If, on the other hand, the host list does contain '$', or we are
3119 randomizing its order, we have to rebuild it each time. In the fixed case,
3120 as the hosts string will never be used again, it doesn't matter that we
3121 replace all the : characters with zeros. */
3122
3123 if (ob->hostlist == NULL)
3124 {
3125 uschar *s = ob->hosts;
3126
3127 if (Ustrchr(s, '$') != NULL)
3128 {
3129 if (!(expanded_hosts = expand_string(s)))
3130 {
3131 addrlist->message = string_sprintf("failed to expand list of hosts "
3132 "\"%s\" in %s transport: %s", s, tblock->name, expand_string_message);
3133 addrlist->transport_return = search_find_defer? DEFER : PANIC;
3134 return FALSE; /* Only top address has status */
3135 }
3136 DEBUG(D_transport) debug_printf("expanded list of hosts \"%s\" to "
3137 "\"%s\"\n", s, expanded_hosts);
3138 s = expanded_hosts;
3139 }
3140 else
3141 if (ob->hosts_randomize) s = expanded_hosts = string_copy(s);
3142
3143 host_build_hostlist(&hostlist, s, ob->hosts_randomize);
3144
3145 /* Check that the expansion yielded something useful. */
3146 if (hostlist == NULL)
3147 {
3148 addrlist->message =
3149 string_sprintf("%s transport has empty hosts setting", tblock->name);
3150 addrlist->transport_return = PANIC;
3151 return FALSE; /* Only top address has status */
3152 }
3153
3154 /* If there was no expansion of hosts, save the host list for
3155 next time. */
3156
3157 if (!expanded_hosts) ob->hostlist = hostlist;
3158 }
3159
3160 /* This is not the first time this transport has been run in this delivery;
3161 the host list was built previously. */
3162
3163 else
3164 hostlist = ob->hostlist;
3165 }
3166
3167 /* The host list was supplied with the address. If hosts_randomize is set, we
3168 must sort it into a random order if it did not come from MX records and has not
3169 already been randomized (but don't bother if continuing down an existing
3170 connection). */
3171
3172 else if (ob->hosts_randomize && hostlist->mx == MX_NONE && !continuing)
3173 {
3174 host_item *newlist = NULL;
3175 while (hostlist != NULL)
3176 {
3177 host_item *h = hostlist;
3178 hostlist = hostlist->next;
3179
3180 h->sort_key = random_number(100);
3181
3182 if (newlist == NULL)
3183 {
3184 h->next = NULL;
3185 newlist = h;
3186 }
3187 else if (h->sort_key < newlist->sort_key)
3188 {
3189 h->next = newlist;
3190 newlist = h;
3191 }
3192 else
3193 {
3194 host_item *hh = newlist;
3195 while (hh->next != NULL)
3196 {
3197 if (h->sort_key < hh->next->sort_key) break;
3198 hh = hh->next;
3199 }
3200 h->next = hh->next;
3201 hh->next = h;
3202 }
3203 }
3204
3205 hostlist = addrlist->host_list = newlist;
3206 }
3207
3208 /* Sort out the default port. */
3209
3210 if (!smtp_get_port(ob->port, addrlist, &port, tid)) return FALSE;
3211
3212 /* For each host-plus-IP-address on the list:
3213
3214 . If this is a continued delivery and the host isn't the one with the
3215 current connection, skip.
3216
3217 . If the status is unusable (i.e. previously failed or retry checked), skip.
3218
3219 . If no IP address set, get the address, either by turning the name into
3220 an address, calling gethostbyname if gethostbyname is on, or by calling
3221 the DNS. The DNS may yield multiple addresses, in which case insert the
3222 extra ones into the list.
3223
3224 . Get the retry data if not previously obtained for this address and set the
3225 field which remembers the state of this address. Skip if the retry time is
3226 not reached. If not, remember whether retry data was found. The retry string
3227 contains both the name and the IP address.
3228
3229 . Scan the list of addresses and mark those whose status is DEFER as
3230 PENDING_DEFER. These are the only ones that will be processed in this cycle
3231 of the hosts loop.
3232
3233 . Make a delivery attempt - addresses marked PENDING_DEFER will be tried.
3234 Some addresses may be successfully delivered, others may fail, and yet
3235 others may get temporary errors and so get marked DEFER.
3236
3237 . The return from the delivery attempt is OK if a connection was made and a
3238 valid SMTP dialogue was completed. Otherwise it is DEFER.
3239
3240 . If OK, add a "remove" retry item for this host/IPaddress, if any.
3241
3242 . If fail to connect, or other defer state, add a retry item.
3243
3244 . If there are any addresses whose status is still DEFER, carry on to the
3245 next host/IPaddress, unless we have tried the number of hosts given
3246 by hosts_max_try or hosts_max_try_hardlimit; otherwise return. Note that
3247 there is some fancy logic for hosts_max_try that means its limit can be
3248 overstepped in some circumstances.
3249
3250 If we get to the end of the list, all hosts have deferred at least one address,
3251 or not reached their retry times. If delay_after_cutoff is unset, it requests a
3252 delivery attempt to those hosts whose last try was before the arrival time of
3253 the current message. To cope with this, we have to go round the loop a second
3254 time. After that, set the status and error data for any addresses that haven't
3255 had it set already. */
3256
3257 for (cutoff_retry = 0; expired &&
3258 cutoff_retry < ((ob->delay_after_cutoff)? 1 : 2);
3259 cutoff_retry++)
3260 {
3261 host_item *nexthost = NULL;
3262 int unexpired_hosts_tried = 0;
3263
3264 for (host = hostlist;
3265 host != NULL &&
3266 unexpired_hosts_tried < ob->hosts_max_try &&
3267 total_hosts_tried < ob->hosts_max_try_hardlimit;
3268 host = nexthost)
3269 {
3270 int rc;
3271 int host_af;
3272 uschar *rs;
3273 BOOL serialized = FALSE;
3274 BOOL host_is_expired = FALSE;
3275 BOOL message_defer = FALSE;
3276 BOOL some_deferred = FALSE;
3277 address_item *first_addr = NULL;
3278 uschar *interface = NULL;
3279 uschar *retry_host_key = NULL;
3280 uschar *retry_message_key = NULL;
3281 uschar *serialize_key = NULL;
3282
3283 /* Default next host is next host. :-) But this can vary if the
3284 hosts_max_try limit is hit (see below). It may also be reset if a host
3285 address is looked up here (in case the host was multihomed). */
3286
3287 nexthost = host->next;
3288
3289 /* If the address hasn't yet been obtained from the host name, look it up
3290 now, unless the host is already marked as unusable. If it is marked as
3291 unusable, it means that the router was unable to find its IP address (in
3292 the DNS or wherever) OR we are in the 2nd time round the cutoff loop, and
3293 the lookup failed last time. We don't get this far if *all* MX records
3294 point to non-existent hosts; that is treated as a hard error.
3295
3296 We can just skip this host entirely. When the hosts came from the router,
3297 the address will timeout based on the other host(s); when the address is
3298 looked up below, there is an explicit retry record added.
3299
3300 Note that we mustn't skip unusable hosts if the address is not unset; they
3301 may be needed as expired hosts on the 2nd time round the cutoff loop. */
3302
3303 if (host->address == NULL)
3304 {
3305 int new_port, flags;
3306 host_item *hh;
3307
3308 if (host->status >= hstatus_unusable)
3309 {
3310 DEBUG(D_transport) debug_printf("%s has no address and is unusable - skipping\n",
3311 host->name);
3312 continue;
3313 }
3314
3315 DEBUG(D_transport) debug_printf("getting address for %s\n", host->name);
3316
3317 /* The host name is permitted to have an attached port. Find it, and
3318 strip it from the name. Just remember it for now. */
3319
3320 new_port = host_item_get_port(host);
3321
3322 /* Count hosts looked up */
3323
3324 hosts_looked_up++;
3325
3326 /* Find by name if so configured, or if it's an IP address. We don't
3327 just copy the IP address, because we need the test-for-local to happen. */
3328
3329 flags = HOST_FIND_BY_A;
3330 if (ob->dns_qualify_single) flags |= HOST_FIND_QUALIFY_SINGLE;
3331 if (ob->dns_search_parents) flags |= HOST_FIND_SEARCH_PARENTS;
3332
3333 if (ob->gethostbyname || string_is_ip_address(host->name, NULL) != 0)
3334 rc = host_find_byname(host, NULL, flags, NULL, TRUE);
3335 else
3336 rc = host_find_bydns(host, NULL, flags, NULL, NULL, NULL,
3337 &ob->dnssec, /* domains for request/require */
3338 NULL, NULL);
3339
3340 /* Update the host (and any additional blocks, resulting from
3341 multihoming) with a host-specific port, if any. */
3342
3343 for (hh = host; hh != nexthost; hh = hh->next) hh->port = new_port;
3344
3345 /* Failure to find the host at this time (usually DNS temporary failure)
3346 is really a kind of routing failure rather than a transp