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[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 #define DELIVER_BUFFER_SIZE 4096
16
17
18 /* Options specific to the smtp transport. This transport also supports LMTP
19 over TCP/IP. The options must be in alphabetic order (note that "_" comes
20 before the lower case letters). Some live in the transport_instance block so as
21 to be publicly visible; these are flagged with opt_public. */
22
23 optionlist smtp_transport_options[] = {
24 { "*expand_multi_domain", opt_stringptr | opt_hidden | opt_public,
25 (void *)offsetof(transport_instance, expand_multi_domain) },
26 { "*expand_retry_include_ip_address", opt_stringptr | opt_hidden,
27 (void *)(offsetof(smtp_transport_options_block, expand_retry_include_ip_address)) },
28
29 { "address_retry_include_sender", opt_bool,
30 (void *)offsetof(smtp_transport_options_block, address_retry_include_sender) },
31 { "allow_localhost", opt_bool,
32 (void *)offsetof(smtp_transport_options_block, allow_localhost) },
33 { "authenticated_sender", opt_stringptr,
34 (void *)offsetof(smtp_transport_options_block, authenticated_sender) },
35 { "authenticated_sender_force", opt_bool,
36 (void *)offsetof(smtp_transport_options_block, authenticated_sender_force) },
37 { "command_timeout", opt_time,
38 (void *)offsetof(smtp_transport_options_block, command_timeout) },
39 { "connect_timeout", opt_time,
40 (void *)offsetof(smtp_transport_options_block, connect_timeout) },
41 { "connection_max_messages", opt_int | opt_public,
42 (void *)offsetof(transport_instance, connection_max_messages) },
43 { "data_timeout", opt_time,
44 (void *)offsetof(smtp_transport_options_block, data_timeout) },
45 { "delay_after_cutoff", opt_bool,
46 (void *)offsetof(smtp_transport_options_block, delay_after_cutoff) },
47 #ifndef DISABLE_DKIM
48 { "dkim_canon", opt_stringptr,
49 (void *)offsetof(smtp_transport_options_block, dkim.dkim_canon) },
50 { "dkim_domain", opt_stringptr,
51 (void *)offsetof(smtp_transport_options_block, dkim.dkim_domain) },
52 { "dkim_private_key", opt_stringptr,
53 (void *)offsetof(smtp_transport_options_block, dkim.dkim_private_key) },
54 { "dkim_selector", opt_stringptr,
55 (void *)offsetof(smtp_transport_options_block, dkim.dkim_selector) },
56 { "dkim_sign_headers", opt_stringptr,
57 (void *)offsetof(smtp_transport_options_block, dkim.dkim_sign_headers) },
58 { "dkim_strict", opt_stringptr,
59 (void *)offsetof(smtp_transport_options_block, dkim.dkim_strict) },
60 #endif
61 { "dns_qualify_single", opt_bool,
62 (void *)offsetof(smtp_transport_options_block, dns_qualify_single) },
63 { "dns_search_parents", opt_bool,
64 (void *)offsetof(smtp_transport_options_block, dns_search_parents) },
65 { "dnssec_request_domains", opt_stringptr,
66 (void *)offsetof(smtp_transport_options_block, dnssec.request) },
67 { "dnssec_require_domains", opt_stringptr,
68 (void *)offsetof(smtp_transport_options_block, dnssec.require) },
69 { "dscp", opt_stringptr,
70 (void *)offsetof(smtp_transport_options_block, dscp) },
71 { "fallback_hosts", opt_stringptr,
72 (void *)offsetof(smtp_transport_options_block, fallback_hosts) },
73 { "final_timeout", opt_time,
74 (void *)offsetof(smtp_transport_options_block, final_timeout) },
75 { "gethostbyname", opt_bool,
76 (void *)offsetof(smtp_transport_options_block, gethostbyname) },
77 { "helo_data", opt_stringptr,
78 (void *)offsetof(smtp_transport_options_block, helo_data) },
79 { "hosts", opt_stringptr,
80 (void *)offsetof(smtp_transport_options_block, hosts) },
81 { "hosts_avoid_esmtp", opt_stringptr,
82 (void *)offsetof(smtp_transport_options_block, hosts_avoid_esmtp) },
83 { "hosts_avoid_pipelining", opt_stringptr,
84 (void *)offsetof(smtp_transport_options_block, hosts_avoid_pipelining) },
85 #ifdef SUPPORT_TLS
86 { "hosts_avoid_tls", opt_stringptr,
87 (void *)offsetof(smtp_transport_options_block, hosts_avoid_tls) },
88 #endif
89 { "hosts_max_try", opt_int,
90 (void *)offsetof(smtp_transport_options_block, hosts_max_try) },
91 { "hosts_max_try_hardlimit", opt_int,
92 (void *)offsetof(smtp_transport_options_block, hosts_max_try_hardlimit) },
93 #ifdef SUPPORT_TLS
94 { "hosts_nopass_tls", opt_stringptr,
95 (void *)offsetof(smtp_transport_options_block, hosts_nopass_tls) },
96 #endif
97 { "hosts_override", opt_bool,
98 (void *)offsetof(smtp_transport_options_block, hosts_override) },
99 { "hosts_randomize", opt_bool,
100 (void *)offsetof(smtp_transport_options_block, hosts_randomize) },
101 #if defined(SUPPORT_TLS) && !defined(DISABLE_OCSP)
102 { "hosts_request_ocsp", opt_stringptr,
103 (void *)offsetof(smtp_transport_options_block, hosts_request_ocsp) },
104 #endif
105 { "hosts_require_auth", opt_stringptr,
106 (void *)offsetof(smtp_transport_options_block, hosts_require_auth) },
107 #ifdef SUPPORT_TLS
108 # ifdef EXPERIMENTAL_DANE
109 { "hosts_require_dane", opt_stringptr,
110 (void *)offsetof(smtp_transport_options_block, hosts_require_dane) },
111 # endif
112 # ifndef DISABLE_OCSP
113 { "hosts_require_ocsp", opt_stringptr,
114 (void *)offsetof(smtp_transport_options_block, hosts_require_ocsp) },
115 # endif
116 { "hosts_require_tls", opt_stringptr,
117 (void *)offsetof(smtp_transport_options_block, hosts_require_tls) },
118 #endif
119 { "hosts_try_auth", opt_stringptr,
120 (void *)offsetof(smtp_transport_options_block, hosts_try_auth) },
121 { "hosts_try_chunking", opt_stringptr,
122 (void *)offsetof(smtp_transport_options_block, hosts_try_chunking) },
123 #if defined(SUPPORT_TLS) && defined(EXPERIMENTAL_DANE)
124 { "hosts_try_dane", opt_stringptr,
125 (void *)offsetof(smtp_transport_options_block, hosts_try_dane) },
126 #endif
127 #ifndef DISABLE_PRDR
128 { "hosts_try_prdr", opt_stringptr,
129 (void *)offsetof(smtp_transport_options_block, hosts_try_prdr) },
130 #endif
131 #ifdef SUPPORT_TLS
132 { "hosts_verify_avoid_tls", opt_stringptr,
133 (void *)offsetof(smtp_transport_options_block, hosts_verify_avoid_tls) },
134 #endif
135 { "interface", opt_stringptr,
136 (void *)offsetof(smtp_transport_options_block, interface) },
137 { "keepalive", opt_bool,
138 (void *)offsetof(smtp_transport_options_block, keepalive) },
139 { "lmtp_ignore_quota", opt_bool,
140 (void *)offsetof(smtp_transport_options_block, lmtp_ignore_quota) },
141 { "max_rcpt", opt_int | opt_public,
142 (void *)offsetof(transport_instance, max_addresses) },
143 { "multi_domain", opt_expand_bool | opt_public,
144 (void *)offsetof(transport_instance, multi_domain) },
145 { "port", opt_stringptr,
146 (void *)offsetof(smtp_transport_options_block, port) },
147 { "protocol", opt_stringptr,
148 (void *)offsetof(smtp_transport_options_block, protocol) },
149 { "retry_include_ip_address", opt_expand_bool,
150 (void *)offsetof(smtp_transport_options_block, retry_include_ip_address) },
151 { "serialize_hosts", opt_stringptr,
152 (void *)offsetof(smtp_transport_options_block, serialize_hosts) },
153 { "size_addition", opt_int,
154 (void *)offsetof(smtp_transport_options_block, size_addition) }
155 #ifdef SUPPORT_SOCKS
156 ,{ "socks_proxy", opt_stringptr,
157 (void *)offsetof(smtp_transport_options_block, socks_proxy) }
158 #endif
159 #ifdef SUPPORT_TLS
160 ,{ "tls_certificate", opt_stringptr,
161 (void *)offsetof(smtp_transport_options_block, tls_certificate) },
162 { "tls_crl", opt_stringptr,
163 (void *)offsetof(smtp_transport_options_block, tls_crl) },
164 { "tls_dh_min_bits", opt_int,
165 (void *)offsetof(smtp_transport_options_block, tls_dh_min_bits) },
166 { "tls_privatekey", opt_stringptr,
167 (void *)offsetof(smtp_transport_options_block, tls_privatekey) },
168 { "tls_require_ciphers", opt_stringptr,
169 (void *)offsetof(smtp_transport_options_block, tls_require_ciphers) },
170 { "tls_sni", opt_stringptr,
171 (void *)offsetof(smtp_transport_options_block, tls_sni) },
172 { "tls_tempfail_tryclear", opt_bool,
173 (void *)offsetof(smtp_transport_options_block, tls_tempfail_tryclear) },
174 { "tls_try_verify_hosts", opt_stringptr,
175 (void *)offsetof(smtp_transport_options_block, tls_try_verify_hosts) },
176 { "tls_verify_cert_hostnames", opt_stringptr,
177 (void *)offsetof(smtp_transport_options_block,tls_verify_cert_hostnames)},
178 { "tls_verify_certificates", opt_stringptr,
179 (void *)offsetof(smtp_transport_options_block, tls_verify_certificates) },
180 { "tls_verify_hosts", opt_stringptr,
181 (void *)offsetof(smtp_transport_options_block, tls_verify_hosts) }
182 #endif
183 };
184
185 /* Size of the options list. An extern variable has to be used so that its
186 address can appear in the tables drtables.c. */
187
188 int smtp_transport_options_count =
189 sizeof(smtp_transport_options)/sizeof(optionlist);
190
191 /* Default private options block for the smtp transport. */
192
193 smtp_transport_options_block smtp_transport_option_defaults = {
194 NULL, /* hosts */
195 NULL, /* fallback_hosts */
196 NULL, /* hostlist */
197 NULL, /* fallback_hostlist */
198 NULL, /* authenticated_sender */
199 US"$primary_hostname", /* helo_data */
200 NULL, /* interface */
201 NULL, /* port */
202 US"smtp", /* protocol */
203 NULL, /* DSCP */
204 NULL, /* serialize_hosts */
205 NULL, /* hosts_try_auth */
206 NULL, /* hosts_require_auth */
207 US"*", /* hosts_try_chunking */
208 #ifdef EXPERIMENTAL_DANE
209 NULL, /* hosts_try_dane */
210 NULL, /* hosts_require_dane */
211 #endif
212 #ifndef DISABLE_PRDR
213 US"*", /* hosts_try_prdr */
214 #endif
215 #ifndef DISABLE_OCSP
216 US"*", /* hosts_request_ocsp (except under DANE; tls_client_start()) */
217 NULL, /* hosts_require_ocsp */
218 #endif
219 NULL, /* hosts_require_tls */
220 NULL, /* hosts_avoid_tls */
221 NULL, /* hosts_verify_avoid_tls */
222 NULL, /* hosts_avoid_pipelining */
223 NULL, /* hosts_avoid_esmtp */
224 NULL, /* hosts_nopass_tls */
225 5*60, /* command_timeout */
226 5*60, /* connect_timeout; shorter system default overrides */
227 5*60, /* data timeout */
228 10*60, /* final timeout */
229 1024, /* size_addition */
230 5, /* hosts_max_try */
231 50, /* hosts_max_try_hardlimit */
232 TRUE, /* address_retry_include_sender */
233 FALSE, /* allow_localhost */
234 FALSE, /* authenticated_sender_force */
235 FALSE, /* gethostbyname */
236 TRUE, /* dns_qualify_single */
237 FALSE, /* dns_search_parents */
238 { NULL, NULL }, /* dnssec_domains {request,require} */
239 TRUE, /* delay_after_cutoff */
240 FALSE, /* hosts_override */
241 FALSE, /* hosts_randomize */
242 TRUE, /* keepalive */
243 FALSE, /* lmtp_ignore_quota */
244 NULL, /* expand_retry_include_ip_address */
245 TRUE /* retry_include_ip_address */
246 #ifdef SUPPORT_SOCKS
247 ,NULL /* socks_proxy */
248 #endif
249 #ifdef SUPPORT_TLS
250 ,NULL, /* tls_certificate */
251 NULL, /* tls_crl */
252 NULL, /* tls_privatekey */
253 NULL, /* tls_require_ciphers */
254 NULL, /* tls_sni */
255 US"system", /* tls_verify_certificates */
256 EXIM_CLIENT_DH_DEFAULT_MIN_BITS,
257 /* tls_dh_min_bits */
258 TRUE, /* tls_tempfail_tryclear */
259 NULL, /* tls_verify_hosts */
260 US"*", /* tls_try_verify_hosts */
261 US"*" /* tls_verify_cert_hostnames */
262 #endif
263 #ifndef DISABLE_DKIM
264 , {NULL, /* dkim_canon */
265 NULL, /* dkim_domain */
266 NULL, /* dkim_private_key */
267 NULL, /* dkim_selector */
268 NULL, /* dkim_sign_headers */
269 NULL} /* dkim_strict */
270 #endif
271 };
272
273 /* some DSN flags for use later */
274
275 static int rf_list[] = {rf_notify_never, rf_notify_success,
276 rf_notify_failure, rf_notify_delay };
277
278 static uschar *rf_names[] = { US"NEVER", US"SUCCESS", US"FAILURE", US"DELAY" };
279
280
281
282 /* Local statics */
283
284 static uschar *smtp_command; /* Points to last cmd for error messages */
285 static uschar *mail_command; /* Points to MAIL cmd for error messages */
286 static BOOL update_waiting; /* TRUE to update the "wait" database */
287 static BOOL pipelining_active; /* current transaction is in pipe mode */
288
289
290 /*************************************************
291 * Setup entry point *
292 *************************************************/
293
294 /* This function is called when the transport is about to be used,
295 but before running it in a sub-process. It is used for two things:
296
297 (1) To set the fallback host list in addresses, when delivering.
298 (2) To pass back the interface, port, protocol, and other options, for use
299 during callout verification.
300
301 Arguments:
302 tblock pointer to the transport instance block
303 addrlist list of addresses about to be transported
304 tf if not NULL, pointer to block in which to return options
305 uid the uid that will be set (not used)
306 gid the gid that will be set (not used)
307 errmsg place for error message (not used)
308
309 Returns: OK always (FAIL, DEFER not used)
310 */
311
312 static int
313 smtp_transport_setup(transport_instance *tblock, address_item *addrlist,
314 transport_feedback *tf, uid_t uid, gid_t gid, uschar **errmsg)
315 {
316 smtp_transport_options_block *ob =
317 (smtp_transport_options_block *)(tblock->options_block);
318
319 errmsg = errmsg; /* Keep picky compilers happy */
320 uid = uid;
321 gid = gid;
322
323 /* Pass back options if required. This interface is getting very messy. */
324
325 if (tf != NULL)
326 {
327 tf->interface = ob->interface;
328 tf->port = ob->port;
329 tf->protocol = ob->protocol;
330 tf->hosts = ob->hosts;
331 tf->hosts_override = ob->hosts_override;
332 tf->hosts_randomize = ob->hosts_randomize;
333 tf->gethostbyname = ob->gethostbyname;
334 tf->qualify_single = ob->dns_qualify_single;
335 tf->search_parents = ob->dns_search_parents;
336 tf->helo_data = ob->helo_data;
337 }
338
339 /* Set the fallback host list for all the addresses that don't have fallback
340 host lists, provided that the local host wasn't present in the original host
341 list. */
342
343 if (!testflag(addrlist, af_local_host_removed))
344 {
345 for (; addrlist != NULL; addrlist = addrlist->next)
346 if (addrlist->fallback_hosts == NULL)
347 addrlist->fallback_hosts = ob->fallback_hostlist;
348 }
349
350 return OK;
351 }
352
353
354
355 /*************************************************
356 * Initialization entry point *
357 *************************************************/
358
359 /* Called for each instance, after its options have been read, to
360 enable consistency checks to be done, or anything else that needs
361 to be set up.
362
363 Argument: pointer to the transport instance block
364 Returns: nothing
365 */
366
367 void
368 smtp_transport_init(transport_instance *tblock)
369 {
370 smtp_transport_options_block *ob =
371 (smtp_transport_options_block *)(tblock->options_block);
372
373 /* Retry_use_local_part defaults FALSE if unset */
374
375 if (tblock->retry_use_local_part == TRUE_UNSET)
376 tblock->retry_use_local_part = FALSE;
377
378 /* Set the default port according to the protocol */
379
380 if (ob->port == NULL)
381 ob->port = (strcmpic(ob->protocol, US"lmtp") == 0)? US"lmtp" :
382 (strcmpic(ob->protocol, US"smtps") == 0)? US"smtps" : US"smtp";
383
384 /* Set up the setup entry point, to be called before subprocesses for this
385 transport. */
386
387 tblock->setup = smtp_transport_setup;
388
389 /* Complain if any of the timeouts are zero. */
390
391 if (ob->command_timeout <= 0 || ob->data_timeout <= 0 ||
392 ob->final_timeout <= 0)
393 log_write(0, LOG_PANIC_DIE|LOG_CONFIG,
394 "command, data, or final timeout value is zero for %s transport",
395 tblock->name);
396
397 /* If hosts_override is set and there are local hosts, set the global
398 flag that stops verify from showing router hosts. */
399
400 if (ob->hosts_override && ob->hosts != NULL) tblock->overrides_hosts = TRUE;
401
402 /* If there are any fallback hosts listed, build a chain of host items
403 for them, but do not do any lookups at this time. */
404
405 host_build_hostlist(&(ob->fallback_hostlist), ob->fallback_hosts, FALSE);
406 }
407
408
409
410
411
412 /*************************************************
413 * Set delivery info into all active addresses *
414 *************************************************/
415
416 /* Only addresses whose status is >= PENDING are relevant. A lesser
417 status means that an address is not currently being processed.
418
419 Arguments:
420 addrlist points to a chain of addresses
421 errno_value to put in each address's errno field
422 msg to put in each address's message field
423 rc to put in each address's transport_return field
424 pass_message if TRUE, set the "pass message" flag in the address
425 host if set, mark addrs as having used this host
426 smtp_greeting from peer
427 helo_response from peer
428
429 If errno_value has the special value ERRNO_CONNECTTIMEOUT, ETIMEDOUT is put in
430 the errno field, and RTEF_CTOUT is ORed into the more_errno field, to indicate
431 this particular type of timeout.
432
433 Returns: nothing
434 */
435
436 static void
437 set_errno(address_item *addrlist, int errno_value, uschar *msg, int rc,
438 BOOL pass_message, host_item * host
439 #ifdef EXPERIMENTAL_DSN_INFO
440 , const uschar * smtp_greeting, const uschar * helo_response
441 #endif
442 )
443 {
444 address_item *addr;
445 int orvalue = 0;
446 if (errno_value == ERRNO_CONNECTTIMEOUT)
447 {
448 errno_value = ETIMEDOUT;
449 orvalue = RTEF_CTOUT;
450 }
451 for (addr = addrlist; addr; addr = addr->next)
452 if (addr->transport_return >= PENDING)
453 {
454 addr->basic_errno = errno_value;
455 addr->more_errno |= orvalue;
456 if (msg != NULL)
457 {
458 addr->message = msg;
459 if (pass_message) setflag(addr, af_pass_message);
460 }
461 addr->transport_return = rc;
462 if (host)
463 {
464 addr->host_used = host;
465 #ifdef EXPERIMENTAL_DSN_INFO
466 if (smtp_greeting)
467 {uschar * s = Ustrchr(smtp_greeting, '\n'); if (s) *s = '\0';}
468 addr->smtp_greeting = smtp_greeting;
469
470 if (helo_response)
471 {uschar * s = Ustrchr(helo_response, '\n'); if (s) *s = '\0';}
472 addr->helo_response = helo_response;
473 #endif
474 }
475 }
476 }
477
478 static void
479 set_errno_nohost(address_item *addrlist, int errno_value, uschar *msg, int rc,
480 BOOL pass_message)
481 {
482 set_errno(addrlist, errno_value, msg, rc, pass_message, NULL
483 #ifdef EXPERIMENTAL_DSN_INFO
484 , NULL, NULL
485 #endif
486 );
487 }
488
489
490 /*************************************************
491 * Check an SMTP response *
492 *************************************************/
493
494 /* This function is given an errno code and the SMTP response buffer
495 to analyse, together with the host identification for generating messages. It
496 sets an appropriate message and puts the first digit of the response code into
497 the yield variable. If no response was actually read, a suitable digit is
498 chosen.
499
500 Arguments:
501 host the current host, to get its name for messages
502 errno_value pointer to the errno value
503 more_errno from the top address for use with ERRNO_FILTER_FAIL
504 buffer the SMTP response buffer
505 yield where to put a one-digit SMTP response code
506 message where to put an errror message
507 pass_message set TRUE if message is an SMTP response
508
509 Returns: TRUE if an SMTP "QUIT" command should be sent, else FALSE
510 */
511
512 static BOOL
513 check_response(host_item *host, int *errno_value, int more_errno,
514 uschar *buffer, int *yield, uschar **message, BOOL *pass_message)
515 {
516 uschar * pl = pipelining_active ? US"pipelined " : US"";
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 DEBUG(D_transport) debug_printf("bad response for MAIL\n");
787 Ustrcpy(big_buffer, mail_command); /* Fits, because it came from there! */
788 if (errno == 0 && buffer[0] != 0)
789 {
790 uschar flushbuffer[4096];
791 int save_errno = 0;
792 if (buffer[0] == '4')
793 {
794 save_errno = ERRNO_MAIL4XX;
795 addr->more_errno |= ((buffer[1] - '0')*10 + buffer[2] - '0') << 8;
796 }
797 while (count-- > 0)
798 {
799 if (!smtp_read_response(inblock, flushbuffer, sizeof(flushbuffer),
800 '2', timeout)
801 && (errno != 0 || flushbuffer[0] == 0))
802 break;
803 }
804 errno = save_errno;
805 }
806
807 if (pending_DATA) count--; /* Number of RCPT responses to come */
808 while (count-- > 0) /* Mark any pending addrs with the host used */
809 {
810 while (addr->transport_return != PENDING_DEFER) addr = addr->next;
811 addr->host_used = host;
812 addr = addr->next;
813 }
814 return -3;
815 }
816 }
817
818 if (pending_DATA) count--; /* Number of RCPT responses to come */
819
820 /* Read and handle the required number of RCPT responses, matching each one up
821 with an address by scanning for the next address whose status is PENDING_DEFER.
822 */
823
824 while (count-- > 0)
825 {
826 while (addr->transport_return != PENDING_DEFER) addr = addr->next;
827
828 /* The address was accepted */
829 addr->host_used = host;
830
831 if (smtp_read_response(inblock, buffer, buffsize, '2', timeout))
832 {
833 yield |= 1;
834 addr->transport_return = PENDING_OK;
835
836 /* If af_dr_retry_exists is set, there was a routing delay on this address;
837 ensure that any address-specific retry record is expunged. We do this both
838 for the basic key and for the version that also includes the sender. */
839
840 if (testflag(addr, af_dr_retry_exists))
841 {
842 uschar *altkey = string_sprintf("%s:<%s>", addr->address_retry_key,
843 sender_address);
844 retry_add_item(addr, altkey, rf_delete);
845 retry_add_item(addr, addr->address_retry_key, rf_delete);
846 }
847 }
848
849 /* Timeout while reading the response */
850
851 else if (errno == ETIMEDOUT)
852 {
853 uschar *message = string_sprintf("SMTP timeout after RCPT TO:<%s>",
854 transport_rcpt_address(addr, include_affixes));
855 set_errno_nohost(addrlist, ETIMEDOUT, message, DEFER, FALSE);
856 retry_add_item(addr, addr->address_retry_key, 0);
857 update_waiting = FALSE;
858 return -1;
859 }
860
861 /* Handle other errors in obtaining an SMTP response by returning -1. This
862 will cause all the addresses to be deferred. Restore the SMTP command in
863 big_buffer for which we are checking the response, so the error message
864 makes sense. */
865
866 else if (errno != 0 || buffer[0] == 0)
867 {
868 string_format(big_buffer, big_buffer_size, "RCPT TO:<%s>",
869 transport_rcpt_address(addr, include_affixes));
870 return -2;
871 }
872
873 /* Handle SMTP permanent and temporary response codes. */
874
875 else
876 {
877 addr->message =
878 string_sprintf("SMTP error from remote mail server after RCPT TO:<%s>: "
879 "%s", transport_rcpt_address(addr, include_affixes),
880 string_printing(buffer));
881 setflag(addr, af_pass_message);
882 msglog_line(host, addr->message);
883
884 /* The response was 5xx */
885
886 if (buffer[0] == '5')
887 {
888 addr->transport_return = FAIL;
889 yield |= 2;
890 }
891
892 /* The response was 4xx */
893
894 else
895 {
896 addr->transport_return = DEFER;
897 addr->basic_errno = ERRNO_RCPT4XX;
898 addr->more_errno |= ((buffer[1] - '0')*10 + buffer[2] - '0') << 8;
899
900 #ifndef DISABLE_EVENT
901 event_defer_errno = addr->more_errno;
902 msg_event_raise(US"msg:rcpt:host:defer", addr);
903 #endif
904
905 /* Log temporary errors if there are more hosts to be tried.
906 If not, log this last one in the == line. */
907
908 if (host->next)
909 log_write(0, LOG_MAIN, "H=%s [%s]: %s", host->name, host->address, addr->message);
910
911 #ifndef DISABLE_EVENT
912 else
913 msg_event_raise(US"msg:rcpt:defer", addr);
914 #endif
915
916 /* Do not put this message on the list of those waiting for specific
917 hosts, as otherwise it is likely to be tried too often. */
918
919 update_waiting = FALSE;
920
921 /* Add a retry item for the address so that it doesn't get tried again
922 too soon. If address_retry_include_sender is true, add the sender address
923 to the retry key. */
924
925 if (address_retry_include_sender)
926 {
927 uschar *altkey = string_sprintf("%s:<%s>", addr->address_retry_key,
928 sender_address);
929 retry_add_item(addr, altkey, 0);
930 }
931 else retry_add_item(addr, addr->address_retry_key, 0);
932 }
933 }
934 } /* Loop for next RCPT response */
935
936 /* Update where to start at for the next block of responses, unless we
937 have already handled all the addresses. */
938
939 if (addr != NULL) *sync_addr = addr->next;
940
941 /* Handle a response to DATA. If we have not had any good recipients, either
942 previously or in this block, the response is ignored. */
943
944 if (pending_DATA != 0 &&
945 !smtp_read_response(inblock, buffer, buffsize, '3', timeout))
946 {
947 int code;
948 uschar *msg;
949 BOOL pass_message;
950 if (pending_DATA > 0 || (yield & 1) != 0)
951 {
952 if (errno == 0 && buffer[0] == '4')
953 {
954 errno = ERRNO_DATA4XX;
955 addrlist->more_errno |= ((buffer[1] - '0')*10 + buffer[2] - '0') << 8;
956 }
957 return -3;
958 }
959 (void)check_response(host, &errno, 0, buffer, &code, &msg, &pass_message);
960 DEBUG(D_transport) debug_printf("%s\nerror for DATA ignored: pipelining "
961 "is in use and there were no good recipients\n", msg);
962 }
963
964 /* All responses read and handled; MAIL (if present) received 2xx and DATA (if
965 present) received 3xx. If any RCPTs were handled and yielded anything other
966 than 4xx, yield will be set non-zero. */
967
968 return yield;
969 }
970
971
972
973 /* Do the client side of smtp-level authentication */
974 /*
975 Arguments:
976 buffer EHLO response from server (gets overwritten)
977 addrlist chain of potential addresses to deliver
978 host host to deliver to
979 ob transport options
980 ibp, obp comms channel control blocks
981
982 Returns:
983 OK Success, or failed (but not required): global "smtp_authenticated" set
984 DEFER Failed authentication (and was required)
985 ERROR Internal problem
986
987 FAIL_SEND Failed communications - transmit
988 FAIL - response
989 */
990
991 int
992 smtp_auth(uschar *buffer, unsigned bufsize, address_item *addrlist, host_item *host,
993 smtp_transport_options_block *ob, BOOL is_esmtp,
994 smtp_inblock *ibp, smtp_outblock *obp)
995 {
996 int require_auth;
997 uschar *fail_reason = US"server did not advertise AUTH support";
998
999 smtp_authenticated = FALSE;
1000 client_authenticator = client_authenticated_id = client_authenticated_sender = NULL;
1001 require_auth = verify_check_given_host(&ob->hosts_require_auth, host);
1002
1003 if (is_esmtp && !regex_AUTH) regex_AUTH =
1004 regex_must_compile(US"\\n250[\\s\\-]AUTH\\s+([\\-\\w\\s]+)(?:\\n|$)",
1005 FALSE, TRUE);
1006
1007 if (is_esmtp && regex_match_and_setup(regex_AUTH, buffer, 0, -1))
1008 {
1009 uschar *names = string_copyn(expand_nstring[1], expand_nlength[1]);
1010 expand_nmax = -1; /* reset */
1011
1012 /* Must not do this check until after we have saved the result of the
1013 regex match above. */
1014
1015 if (require_auth == OK ||
1016 verify_check_given_host(&ob->hosts_try_auth, host) == OK)
1017 {
1018 auth_instance *au;
1019 fail_reason = US"no common mechanisms were found";
1020
1021 DEBUG(D_transport) debug_printf("scanning authentication mechanisms\n");
1022
1023 /* Scan the configured authenticators looking for one which is configured
1024 for use as a client, which is not suppressed by client_condition, and
1025 whose name matches an authentication mechanism supported by the server.
1026 If one is found, attempt to authenticate by calling its client function.
1027 */
1028
1029 for (au = auths; !smtp_authenticated && au != NULL; au = au->next)
1030 {
1031 uschar *p = names;
1032 if (!au->client ||
1033 (au->client_condition != NULL &&
1034 !expand_check_condition(au->client_condition, au->name,
1035 US"client authenticator")))
1036 {
1037 DEBUG(D_transport) debug_printf("skipping %s authenticator: %s\n",
1038 au->name,
1039 (au->client)? "client_condition is false" :
1040 "not configured as a client");
1041 continue;
1042 }
1043
1044 /* Loop to scan supported server mechanisms */
1045
1046 while (*p != 0)
1047 {
1048 int rc;
1049 int len = Ustrlen(au->public_name);
1050 while (isspace(*p)) p++;
1051
1052 if (strncmpic(au->public_name, p, len) != 0 ||
1053 (p[len] != 0 && !isspace(p[len])))
1054 {
1055 while (*p != 0 && !isspace(*p)) p++;
1056 continue;
1057 }
1058
1059 /* Found data for a listed mechanism. Call its client entry. Set
1060 a flag in the outblock so that data is overwritten after sending so
1061 that reflections don't show it. */
1062
1063 fail_reason = US"authentication attempt(s) failed";
1064 obp->authenticating = TRUE;
1065 rc = (au->info->clientcode)(au, ibp, obp,
1066 ob->command_timeout, buffer, bufsize);
1067 obp->authenticating = FALSE;
1068 DEBUG(D_transport) debug_printf("%s authenticator yielded %d\n",
1069 au->name, rc);
1070
1071 /* A temporary authentication failure must hold up delivery to
1072 this host. After a permanent authentication failure, we carry on
1073 to try other authentication methods. If all fail hard, try to
1074 deliver the message unauthenticated unless require_auth was set. */
1075
1076 switch(rc)
1077 {
1078 case OK:
1079 smtp_authenticated = TRUE; /* stops the outer loop */
1080 client_authenticator = au->name;
1081 if (au->set_client_id != NULL)
1082 client_authenticated_id = expand_string(au->set_client_id);
1083 break;
1084
1085 /* Failure after writing a command */
1086
1087 case FAIL_SEND:
1088 return FAIL_SEND;
1089
1090 /* Failure after reading a response */
1091
1092 case FAIL:
1093 if (errno != 0 || buffer[0] != '5') return FAIL;
1094 log_write(0, LOG_MAIN, "%s authenticator failed H=%s [%s] %s",
1095 au->name, host->name, host->address, buffer);
1096 break;
1097
1098 /* Failure by some other means. In effect, the authenticator
1099 decided it wasn't prepared to handle this case. Typically this
1100 is the result of "fail" in an expansion string. Do we need to
1101 log anything here? Feb 2006: a message is now put in the buffer
1102 if logging is required. */
1103
1104 case CANCELLED:
1105 if (*buffer != 0)
1106 log_write(0, LOG_MAIN, "%s authenticator cancelled "
1107 "authentication H=%s [%s] %s", au->name, host->name,
1108 host->address, buffer);
1109 break;
1110
1111 /* Internal problem, message in buffer. */
1112
1113 case ERROR:
1114 set_errno_nohost(addrlist, ERRNO_AUTHPROB, string_copy(buffer),
1115 DEFER, FALSE);
1116 return ERROR;
1117 }
1118
1119 break; /* If not authenticated, try next authenticator */
1120 } /* Loop for scanning supported server mechanisms */
1121 } /* Loop for further authenticators */
1122 }
1123 }
1124
1125 /* If we haven't authenticated, but are required to, give up. */
1126
1127 if (require_auth == OK && !smtp_authenticated)
1128 {
1129 set_errno_nohost(addrlist, ERRNO_AUTHFAIL,
1130 string_sprintf("authentication required but %s", fail_reason), DEFER,
1131 FALSE);
1132 return DEFER;
1133 }
1134
1135 return OK;
1136 }
1137
1138
1139 /* Construct AUTH appendix string for MAIL TO */
1140 /*
1141 Arguments
1142 buffer to build string
1143 addrlist chain of potential addresses to deliver
1144 ob transport options
1145
1146 Globals smtp_authenticated
1147 client_authenticated_sender
1148 Return True on error, otherwise buffer has (possibly empty) terminated string
1149 */
1150
1151 BOOL
1152 smtp_mail_auth_str(uschar *buffer, unsigned bufsize, address_item *addrlist,
1153 smtp_transport_options_block *ob)
1154 {
1155 uschar *local_authenticated_sender = authenticated_sender;
1156
1157 #ifdef notdef
1158 debug_printf("smtp_mail_auth_str: as<%s> os<%s> SA<%s>\n", authenticated_sender, ob->authenticated_sender, smtp_authenticated?"Y":"N");
1159 #endif
1160
1161 if (ob->authenticated_sender != NULL)
1162 {
1163 uschar *new = expand_string(ob->authenticated_sender);
1164 if (new == NULL)
1165 {
1166 if (!expand_string_forcedfail)
1167 {
1168 uschar *message = string_sprintf("failed to expand "
1169 "authenticated_sender: %s", expand_string_message);
1170 set_errno_nohost(addrlist, ERRNO_EXPANDFAIL, message, DEFER, FALSE);
1171 return TRUE;
1172 }
1173 }
1174 else if (new[0] != 0) local_authenticated_sender = new;
1175 }
1176
1177 /* Add the authenticated sender address if present */
1178
1179 if ((smtp_authenticated || ob->authenticated_sender_force) &&
1180 local_authenticated_sender != NULL)
1181 {
1182 string_format(buffer, bufsize, " AUTH=%s",
1183 auth_xtextencode(local_authenticated_sender,
1184 Ustrlen(local_authenticated_sender)));
1185 client_authenticated_sender = string_copy(local_authenticated_sender);
1186 }
1187 else
1188 *buffer= 0;
1189
1190 return FALSE;
1191 }
1192
1193
1194
1195 #ifdef EXPERIMENTAL_DANE
1196 /* Lookup TLSA record for host/port.
1197 Return: OK success with dnssec; DANE mode
1198 DEFER Do not use this host now, may retry later
1199 FAIL_FORCED No TLSA record; DANE not usable
1200 FAIL Do not use this connection
1201 */
1202
1203 int
1204 tlsa_lookup(const host_item * host, dns_answer * dnsa, BOOL dane_required)
1205 {
1206 /* move this out to host.c given the similarity to dns_lookup() ? */
1207 uschar buffer[300];
1208 const uschar * fullname = buffer;
1209
1210 /* TLSA lookup string */
1211 (void)sprintf(CS buffer, "_%d._tcp.%.256s", host->port, host->name);
1212
1213 switch (dns_lookup(dnsa, buffer, T_TLSA, &fullname))
1214 {
1215 case DNS_SUCCEED:
1216 if (!dns_is_secure(dnsa))
1217 {
1218 log_write(0, LOG_MAIN, "DANE error: TLSA lookup not DNSSEC");
1219 return DEFER;
1220 }
1221 return OK;
1222
1223 case DNS_AGAIN:
1224 return DEFER; /* just defer this TLS'd conn */
1225
1226 case DNS_NODATA: /* no TLSA RR for this lookup */
1227 case DNS_NOMATCH: /* no records at all for this lookup */
1228 return dane_required ? FAIL : FAIL_FORCED;
1229
1230 default:
1231 case DNS_FAIL:
1232 return dane_required ? FAIL : DEFER;
1233 }
1234 }
1235 #endif
1236
1237
1238
1239 typedef struct smtp_compare_s
1240 {
1241 uschar *current_sender_address;
1242 struct transport_instance *tblock;
1243 } smtp_compare_t;
1244
1245 /*
1246 Create a unique string that identifies this message, it is based on
1247 sender_address, helo_data and tls_certificate if enabled. */
1248
1249 static uschar *
1250 smtp_local_identity(uschar * sender, struct transport_instance * tblock)
1251 {
1252 address_item * addr1;
1253 uschar * if1 = US"";
1254 uschar * helo1 = US"";
1255 #ifdef SUPPORT_TLS
1256 uschar * tlsc1 = US"";
1257 #endif
1258 uschar * save_sender_address = sender_address;
1259 uschar * local_identity = NULL;
1260 smtp_transport_options_block * ob =
1261 (smtp_transport_options_block *)tblock->options_block;
1262
1263 sender_address = sender;
1264
1265 addr1 = deliver_make_addr (sender, TRUE);
1266 deliver_set_expansions(addr1);
1267
1268 if (ob->interface)
1269 if1 = expand_string(ob->interface);
1270
1271 if (ob->helo_data)
1272 helo1 = expand_string(ob->helo_data);
1273
1274 #ifdef SUPPORT_TLS
1275 if (ob->tls_certificate)
1276 tlsc1 = expand_string(ob->tls_certificate);
1277 local_identity = string_sprintf ("%s^%s^%s", if1, helo1, tlsc1);
1278 #else
1279 local_identity = string_sprintf ("%s^%s", if1, helo1);
1280 #endif
1281
1282 deliver_set_expansions(NULL);
1283 sender_address = save_sender_address;
1284
1285 return local_identity;
1286 }
1287
1288
1289
1290 /* This routine is a callback that is called from transport_check_waiting.
1291 This function will evaluate the incoming message versus the previous
1292 message. If the incoming message is using a different local identity then
1293 we will veto this new message. */
1294
1295 static BOOL
1296 smtp_are_same_identities(uschar * message_id, smtp_compare_t * s_compare)
1297 {
1298 uschar * message_local_identity,
1299 * current_local_identity,
1300 * new_sender_address;
1301
1302 current_local_identity =
1303 smtp_local_identity(s_compare->current_sender_address, s_compare->tblock);
1304
1305 if (!(new_sender_address = deliver_get_sender_address(message_id)))
1306 return 0;
1307
1308 message_local_identity =
1309 smtp_local_identity(new_sender_address, s_compare->tblock);
1310
1311 return Ustrcmp(current_local_identity, message_local_identity) == 0;
1312 }
1313
1314
1315
1316 uschar
1317 ehlo_response(uschar * buf, size_t bsize, uschar checks)
1318 {
1319 #ifdef SUPPORT_TLS
1320 if ( checks & PEER_OFFERED_TLS
1321 && pcre_exec(regex_STARTTLS, NULL, CS buf, bsize, 0, PCRE_EOPT, NULL, 0) < 0)
1322 checks &= ~PEER_OFFERED_TLS;
1323 #endif
1324
1325 if ( checks & PEER_OFFERED_IGNQ
1326 && pcre_exec(regex_IGNOREQUOTA, NULL, CS buf, bsize, 0,
1327 PCRE_EOPT, NULL, 0) < 0)
1328 checks &= ~PEER_OFFERED_IGNQ;
1329
1330 if ( checks & PEER_OFFERED_CHUNKING
1331 && pcre_exec(regex_CHUNKING, NULL, CS buf, bsize, 0, PCRE_EOPT, NULL, 0) < 0)
1332 checks &= ~PEER_OFFERED_CHUNKING;
1333
1334 #ifndef DISABLE_PRDR
1335 if ( checks & PEER_OFFERED_PRDR
1336 && pcre_exec(regex_PRDR, NULL, CS buf, bsize, 0, PCRE_EOPT, NULL, 0) < 0)
1337 checks &= ~PEER_OFFERED_PRDR;
1338 #endif
1339
1340 #ifdef SUPPORT_I18N
1341 if ( checks & PEER_OFFERED_UTF8
1342 && pcre_exec(regex_UTF8, NULL, CS buf, bsize, 0, PCRE_EOPT, NULL, 0) < 0)
1343 checks &= ~PEER_OFFERED_UTF8;
1344 #endif
1345
1346 if ( checks & PEER_OFFERED_DSN
1347 && pcre_exec(regex_DSN, NULL, CS buf, bsize, 0, PCRE_EOPT, NULL, 0) < 0)
1348 checks &= ~PEER_OFFERED_DSN;
1349
1350 if ( checks & PEER_OFFERED_PIPE
1351 && pcre_exec(regex_PIPELINING, NULL, CS buf, bsize, 0,
1352 PCRE_EOPT, NULL, 0) < 0)
1353 checks &= ~PEER_OFFERED_PIPE;
1354
1355 if ( checks & PEER_OFFERED_SIZE
1356 && pcre_exec(regex_SIZE, NULL, CS buf, bsize, 0, PCRE_EOPT, NULL, 0) < 0)
1357 checks &= ~PEER_OFFERED_SIZE;
1358
1359 return checks;
1360 }
1361
1362
1363
1364 /* Callback for emitting a BDAT data chunk header.
1365
1366 If given a nonzero size, first flush any buffered SMTP commands
1367 then emit the command.
1368
1369 Reap previous SMTP command responses if requested.
1370 Reap one SMTP command response if requested.
1371
1372 Returns: OK or ERROR
1373 */
1374
1375 static int
1376 smtp_chunk_cmd_callback(int fd, transport_ctx * tctx,
1377 unsigned chunk_size, unsigned flags)
1378 {
1379 smtp_transport_options_block * ob =
1380 (smtp_transport_options_block *)(tctx->tblock->options_block);
1381 int cmd_count = 0;
1382 int prev_cmd_count;
1383 uschar * buffer = tctx->buffer;
1384
1385
1386 /* Write SMTP chunk header command */
1387
1388 if (chunk_size > 0)
1389 if((cmd_count = smtp_write_command(tctx->outblock, FALSE, "BDAT %u%s\r\n",
1390 chunk_size,
1391 flags & tc_chunk_last ? " LAST" : "")
1392 ) < 0) return ERROR;
1393
1394 prev_cmd_count = cmd_count += tctx->cmd_count;
1395
1396 /* Reap responses for any previous, but not one we just emitted */
1397
1398 if (chunk_size > 0)
1399 prev_cmd_count--;
1400 if (tctx->pending_BDAT)
1401 prev_cmd_count--;
1402
1403 if (flags & tc_reap_prev && prev_cmd_count > 0)
1404 {
1405
1406 switch(sync_responses(tctx->first_addr, tctx->tblock->rcpt_include_affixes,
1407 tctx->sync_addr, tctx->host, prev_cmd_count,
1408 ob->address_retry_include_sender,
1409 tctx->pending_MAIL, 0,
1410 tctx->inblock,
1411 ob->command_timeout,
1412 buffer, DELIVER_BUFFER_SIZE))
1413 {
1414 case 1: /* 2xx (only) => OK */
1415 case 3: tctx->good_RCPT = TRUE; /* 2xx & 5xx => OK & progress made */
1416 case 2: *tctx->completed_address = TRUE; /* 5xx (only) => progress made */
1417 case 0: break; /* No 2xx or 5xx, but no probs */
1418
1419 case -1: /* Timeout on RCPT */
1420 default: return ERROR; /* I/O error, or any MAIL/DATA error */
1421 }
1422 cmd_count = 1;
1423 if (!tctx->pending_BDAT)
1424 pipelining_active = FALSE;
1425 }
1426
1427 /* Reap response for the cmd we just emitted, or an outstanding BDAT */
1428
1429 if (flags & tc_reap_one || tctx->pending_BDAT)
1430 {
1431 if (!smtp_read_response(tctx->inblock, buffer, DELIVER_BUFFER_SIZE, '2',
1432 ob->command_timeout))
1433 {
1434 if (errno == 0 && buffer[0] == '4')
1435 {
1436 errno = ERRNO_DATA4XX; /*XXX does this actually get used? */
1437 tctx->first_addr->more_errno |=
1438 ((buffer[1] - '0')*10 + buffer[2] - '0') << 8;
1439 }
1440 return ERROR;
1441 }
1442 cmd_count--;
1443 tctx->pending_BDAT = FALSE;
1444 pipelining_active = FALSE;
1445 }
1446 else if (chunk_size > 0)
1447 tctx->pending_BDAT = TRUE;
1448
1449
1450 tctx->cmd_count = cmd_count;
1451 return OK;
1452 }
1453
1454
1455
1456 /*************************************************
1457 * Deliver address list to given host *
1458 *************************************************/
1459
1460 /* If continue_hostname is not null, we get here only when continuing to
1461 deliver down an existing channel. The channel was passed as the standard
1462 input. TLS is never active on a passed channel; the previous process always
1463 closes it down before passing the connection on.
1464
1465 Otherwise, we have to make a connection to the remote host, and do the
1466 initial protocol exchange.
1467
1468 When running as an MUA wrapper, if the sender or any recipient is rejected,
1469 temporarily or permanently, we force failure for all recipients.
1470
1471 Arguments:
1472 addrlist chain of potential addresses to deliver; only those whose
1473 transport_return field is set to PENDING_DEFER are currently
1474 being processed; others should be skipped - they have either
1475 been delivered to an earlier host or IP address, or been
1476 failed by one of them.
1477 host host to deliver to
1478 host_af AF_INET or AF_INET6
1479 port default TCP/IP port to use, in host byte order
1480 interface interface to bind to, or NULL
1481 tblock transport instance block
1482 message_defer set TRUE if yield is OK, but all addresses were deferred
1483 because of a non-recipient, non-host failure, that is, a
1484 4xx response to MAIL FROM, DATA, or ".". This is a defer
1485 that is specific to the message.
1486 suppress_tls if TRUE, don't attempt a TLS connection - this is set for
1487 a second attempt after TLS initialization fails
1488
1489 Returns: OK - the connection was made and the delivery attempted;
1490 the result for each address is in its data block.
1491 DEFER - the connection could not be made, or something failed
1492 while setting up the SMTP session, or there was a
1493 non-message-specific error, such as a timeout.
1494 ERROR - a filter command is specified for this transport,
1495 and there was a problem setting it up; OR helo_data
1496 or add_headers or authenticated_sender is specified
1497 for this transport, and the string failed to expand
1498 */
1499
1500 static int
1501 smtp_deliver(address_item *addrlist, host_item *host, int host_af, int port,
1502 uschar *interface, transport_instance *tblock,
1503 BOOL *message_defer, BOOL suppress_tls)
1504 {
1505 address_item *addr;
1506 address_item *sync_addr;
1507 address_item *first_addr = addrlist;
1508 int yield = OK;
1509 int address_count;
1510 int save_errno;
1511 int rc;
1512 time_t start_delivery_time = time(NULL);
1513 smtp_transport_options_block *ob =
1514 (smtp_transport_options_block *)(tblock->options_block);
1515 BOOL lmtp = strcmpic(ob->protocol, US"lmtp") == 0;
1516 BOOL smtps = strcmpic(ob->protocol, US"smtps") == 0;
1517 BOOL ok = FALSE;
1518 BOOL send_rset = TRUE;
1519 BOOL send_quit = TRUE;
1520 BOOL setting_up = TRUE;
1521 BOOL completed_address = FALSE;
1522 BOOL esmtp = TRUE;
1523 BOOL pending_MAIL;
1524 BOOL pass_message = FALSE;
1525 uschar peer_offered = 0;
1526 #ifndef DISABLE_PRDR
1527 BOOL prdr_active;
1528 #endif
1529 #ifdef SUPPORT_I18N
1530 BOOL utf8_needed = FALSE;
1531 #endif
1532 BOOL dsn_all_lasthop = TRUE;
1533 #if defined(SUPPORT_TLS) && defined(EXPERIMENTAL_DANE)
1534 BOOL dane = FALSE;
1535 BOOL dane_required = verify_check_given_host(&ob->hosts_require_dane, host) == OK;
1536 dns_answer tlsa_dnsa;
1537 #endif
1538 smtp_inblock inblock;
1539 smtp_outblock outblock;
1540 int max_rcpt = tblock->max_addresses;
1541 uschar *igquotstr = US"";
1542
1543 #ifdef EXPERIMENTAL_DSN_INFO
1544 uschar *smtp_greeting = NULL;
1545 uschar *helo_response = NULL;
1546 #endif
1547 uschar *helo_data = NULL;
1548
1549 uschar *message = NULL;
1550 uschar new_message_id[MESSAGE_ID_LENGTH + 1];
1551 uschar *p;
1552 uschar buffer[DELIVER_BUFFER_SIZE];
1553 uschar inbuffer[4096];
1554 uschar outbuffer[4096];
1555
1556 suppress_tls = suppress_tls; /* stop compiler warning when no TLS support */
1557
1558 *message_defer = FALSE;
1559 smtp_command = US"initial connection";
1560 if (max_rcpt == 0) max_rcpt = 999999;
1561
1562 /* Set up the buffer for reading SMTP response packets. */
1563
1564 inblock.buffer = inbuffer;
1565 inblock.buffersize = sizeof(inbuffer);
1566 inblock.ptr = inbuffer;
1567 inblock.ptrend = inbuffer;
1568
1569 /* Set up the buffer for holding SMTP commands while pipelining */
1570
1571 outblock.buffer = outbuffer;
1572 outblock.buffersize = sizeof(outbuffer);
1573 outblock.ptr = outbuffer;
1574 outblock.cmd_count = 0;
1575 outblock.authenticating = FALSE;
1576
1577 /* Reset the parameters of a TLS session. */
1578
1579 tls_out.bits = 0;
1580 tls_out.cipher = NULL; /* the one we may use for this transport */
1581 tls_out.ourcert = NULL;
1582 tls_out.peercert = NULL;
1583 tls_out.peerdn = NULL;
1584 #if defined(SUPPORT_TLS) && !defined(USE_GNUTLS)
1585 tls_out.sni = NULL;
1586 #endif
1587 tls_out.ocsp = OCSP_NOT_REQ;
1588
1589 /* Flip the legacy TLS-related variables over to the outbound set in case
1590 they're used in the context of the transport. Don't bother resetting
1591 afterward as we're in a subprocess. */
1592
1593 tls_modify_variables(&tls_out);
1594
1595 #ifndef SUPPORT_TLS
1596 if (smtps)
1597 {
1598 set_errno_nohost(addrlist, ERRNO_TLSFAILURE, US"TLS support not available",
1599 DEFER, FALSE);
1600 return ERROR;
1601 }
1602 #endif
1603
1604 /* Make a connection to the host if this isn't a continued delivery, and handle
1605 the initial interaction and HELO/EHLO/LHLO. Connect timeout errors are handled
1606 specially so they can be identified for retries. */
1607
1608 if (continue_hostname == NULL)
1609 {
1610 /* This puts port into host->port */
1611 inblock.sock = outblock.sock =
1612 smtp_connect(host, host_af, port, interface, ob->connect_timeout, tblock);
1613
1614 if (inblock.sock < 0)
1615 {
1616 set_errno_nohost(addrlist, (errno == ETIMEDOUT)? ERRNO_CONNECTTIMEOUT : errno,
1617 NULL, DEFER, FALSE);
1618 return DEFER;
1619 }
1620
1621 #if defined(SUPPORT_TLS) && defined(EXPERIMENTAL_DANE)
1622 {
1623 tls_out.dane_verified = FALSE;
1624 tls_out.tlsa_usage = 0;
1625
1626 if (host->dnssec == DS_YES)
1627 {
1628 if( dane_required
1629 || verify_check_given_host(&ob->hosts_try_dane, host) == OK
1630 )
1631 switch (rc = tlsa_lookup(host, &tlsa_dnsa, dane_required))
1632 {
1633 case OK: dane = TRUE; break;
1634 case FAIL_FORCED: break;
1635 default: set_errno_nohost(addrlist, ERRNO_DNSDEFER,
1636 string_sprintf("DANE error: tlsa lookup %s",
1637 rc == DEFER ? "DEFER" : "FAIL"),
1638 rc, FALSE);
1639 return rc;
1640 }
1641 }
1642 else if (dane_required)
1643 {
1644 set_errno_nohost(addrlist, ERRNO_DNSDEFER,
1645 string_sprintf("DANE error: %s lookup not DNSSEC", host->name),
1646 FAIL, FALSE);
1647 return FAIL;
1648 }
1649
1650 if (dane)
1651 ob->tls_tempfail_tryclear = FALSE;
1652 }
1653 #endif /*DANE*/
1654
1655 /* Expand the greeting message while waiting for the initial response. (Makes
1656 sense if helo_data contains ${lookup dnsdb ...} stuff). The expansion is
1657 delayed till here so that $sending_interface and $sending_port are set. */
1658
1659 helo_data = expand_string(ob->helo_data);
1660 #ifdef SUPPORT_I18N
1661 if (helo_data)
1662 {
1663 uschar * errstr = NULL;
1664 if ((helo_data = string_domain_utf8_to_alabel(helo_data, &errstr)), errstr)
1665 {
1666 errstr = string_sprintf("failed to expand helo_data: %s", errstr);
1667 set_errno_nohost(addrlist, ERRNO_EXPANDFAIL, errstr, DEFER, FALSE);
1668 yield = DEFER;
1669 goto SEND_QUIT;
1670 }
1671 }
1672 #endif
1673
1674 /* The first thing is to wait for an initial OK response. The dreaded "goto"
1675 is nevertheless a reasonably clean way of programming this kind of logic,
1676 where you want to escape on any error. */
1677
1678 if (!smtps)
1679 {
1680 BOOL good_response = smtp_read_response(&inblock, buffer, sizeof(buffer),
1681 '2', ob->command_timeout);
1682 #ifdef EXPERIMENTAL_DSN_INFO
1683 smtp_greeting = string_copy(buffer);
1684 #endif
1685 if (!good_response) goto RESPONSE_FAILED;
1686
1687 #ifndef DISABLE_EVENT
1688 {
1689 uschar * s;
1690 lookup_dnssec_authenticated = host->dnssec==DS_YES ? US"yes"
1691 : host->dnssec==DS_NO ? US"no" : NULL;
1692 s = event_raise(tblock->event_action, US"smtp:connect", buffer);
1693 if (s)
1694 {
1695 set_errno_nohost(addrlist, ERRNO_EXPANDFAIL,
1696 string_sprintf("deferred by smtp:connect event expansion: %s", s),
1697 DEFER, FALSE);
1698 yield = DEFER;
1699 goto SEND_QUIT;
1700 }
1701 }
1702 #endif
1703
1704 /* Now check if the helo_data expansion went well, and sign off cleanly if
1705 it didn't. */
1706
1707 if (helo_data == NULL)
1708 {
1709 uschar *message = string_sprintf("failed to expand helo_data: %s",
1710 expand_string_message);
1711 set_errno_nohost(addrlist, ERRNO_EXPANDFAIL, message, DEFER, FALSE);
1712 yield = DEFER;
1713 goto SEND_QUIT;
1714 }
1715 }
1716
1717 /** Debugging without sending a message
1718 addrlist->transport_return = DEFER;
1719 goto SEND_QUIT;
1720 **/
1721
1722 /* Errors that occur after this point follow an SMTP command, which is
1723 left in big_buffer by smtp_write_command() for use in error messages. */
1724
1725 smtp_command = big_buffer;
1726
1727 /* Tell the remote who we are...
1728
1729 February 1998: A convention has evolved that ESMTP-speaking MTAs include the
1730 string "ESMTP" in their greeting lines, so make Exim send EHLO if the
1731 greeting is of this form. The assumption was that the far end supports it
1732 properly... but experience shows that there are some that give 5xx responses,
1733 even though the banner includes "ESMTP" (there's a bloody-minded one that
1734 says "ESMTP not spoken here"). Cope with that case.
1735
1736 September 2000: Time has passed, and it seems reasonable now to always send
1737 EHLO at the start. It is also convenient to make the change while installing
1738 the TLS stuff.
1739
1740 July 2003: Joachim Wieland met a broken server that advertises "PIPELINING"
1741 but times out after sending MAIL FROM, RCPT TO and DATA all together. There
1742 would be no way to send out the mails, so there is now a host list
1743 "hosts_avoid_esmtp" that disables ESMTP for special hosts and solves the
1744 PIPELINING problem as well. Maybe it can also be useful to cure other
1745 problems with broken servers.
1746
1747 Exim originally sent "Helo" at this point and ran for nearly a year that way.
1748 Then somebody tried it with a Microsoft mailer... It seems that all other
1749 mailers use upper case for some reason (the RFC is quite clear about case
1750 independence) so, for peace of mind, I gave in. */
1751
1752 esmtp = verify_check_given_host(&ob->hosts_avoid_esmtp, host) != OK;
1753
1754 /* Alas; be careful, since this goto is not an error-out, so conceivably
1755 we might set data between here and the target which we assume to exist
1756 and be usable. I can see this coming back to bite us. */
1757 #ifdef SUPPORT_TLS
1758 if (smtps)
1759 {
1760 smtp_peer_options |= PEER_OFFERED_TLS;
1761 suppress_tls = FALSE;
1762 ob->tls_tempfail_tryclear = FALSE;
1763 smtp_command = US"SSL-on-connect";
1764 goto TLS_NEGOTIATE;
1765 }
1766 #endif
1767
1768 if (esmtp)
1769 {
1770 if (smtp_write_command(&outblock, FALSE, "%s %s\r\n",
1771 lmtp? "LHLO" : "EHLO", helo_data) < 0)
1772 goto SEND_FAILED;
1773 if (!smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
1774 ob->command_timeout))
1775 {
1776 if (errno != 0 || buffer[0] == 0 || lmtp)
1777 {
1778 #ifdef EXPERIMENTAL_DSN_INFO
1779 helo_response = string_copy(buffer);
1780 #endif
1781 goto RESPONSE_FAILED;
1782 }
1783 esmtp = FALSE;
1784 }
1785 #ifdef EXPERIMENTAL_DSN_INFO
1786 helo_response = string_copy(buffer);
1787 #endif
1788 }
1789 else
1790 {
1791 DEBUG(D_transport)
1792 debug_printf("not sending EHLO (host matches hosts_avoid_esmtp)\n");
1793 }
1794
1795 if (!esmtp)
1796 {
1797 BOOL good_response;
1798
1799 if (smtp_write_command(&outblock, FALSE, "HELO %s\r\n", helo_data) < 0)
1800 goto SEND_FAILED;
1801 good_response = smtp_read_response(&inblock, buffer, sizeof(buffer),
1802 '2', ob->command_timeout);
1803 #ifdef EXPERIMENTAL_DSN_INFO
1804 helo_response = string_copy(buffer);
1805 #endif
1806 if (!good_response) goto RESPONSE_FAILED;
1807 }
1808
1809 peer_offered = smtp_peer_options = 0;
1810
1811 if (esmtp || lmtp)
1812 {
1813 peer_offered = ehlo_response(buffer, Ustrlen(buffer),
1814 PEER_OFFERED_TLS /* others checked later */
1815 );
1816
1817 /* Set tls_offered if the response to EHLO specifies support for STARTTLS. */
1818
1819 #ifdef SUPPORT_TLS
1820 smtp_peer_options |= peer_offered & PEER_OFFERED_TLS;
1821 #endif
1822 }
1823 }
1824
1825 /* For continuing deliveries down the same channel, the socket is the standard
1826 input, and we don't need to redo EHLO here (but may need to do so for TLS - see
1827 below). Set up the pointer to where subsequent commands will be left, for
1828 error messages. Note that smtp_peer_options will have been
1829 set from the command line if they were set in the process that passed the
1830 connection on. */
1831
1832 /*XXX continue case needs to propagate DSN_INFO, prob. in deliver.c
1833 as the contine goes via transport_pass_socket() and doublefork and exec.
1834 It does not wait. Unclear how we keep separate host's responses
1835 separate - we could match up by host ip+port as a bodge. */
1836
1837 else
1838 {
1839 inblock.sock = outblock.sock = fileno(stdin);
1840 smtp_command = big_buffer;
1841 host->port = port; /* Record the port that was used */
1842 }
1843
1844 /* If TLS is available on this connection, whether continued or not, attempt to
1845 start up a TLS session, unless the host is in hosts_avoid_tls. If successful,
1846 send another EHLO - the server may give a different answer in secure mode. We
1847 use a separate buffer for reading the response to STARTTLS so that if it is
1848 negative, the original EHLO data is available for subsequent analysis, should
1849 the client not be required to use TLS. If the response is bad, copy the buffer
1850 for error analysis. */
1851
1852 #ifdef SUPPORT_TLS
1853 if ( smtp_peer_options & PEER_OFFERED_TLS
1854 && !suppress_tls
1855 && verify_check_given_host(&ob->hosts_avoid_tls, host) != OK)
1856 {
1857 uschar buffer2[4096];
1858 if (smtp_write_command(&outblock, FALSE, "STARTTLS\r\n") < 0)
1859 goto SEND_FAILED;
1860
1861 /* If there is an I/O error, transmission of this message is deferred. If
1862 there is a temporary rejection of STARRTLS and tls_tempfail_tryclear is
1863 false, we also defer. However, if there is a temporary rejection of STARTTLS
1864 and tls_tempfail_tryclear is true, or if there is an outright rejection of
1865 STARTTLS, we carry on. This means we will try to send the message in clear,
1866 unless the host is in hosts_require_tls (tested below). */
1867
1868 if (!smtp_read_response(&inblock, buffer2, sizeof(buffer2), '2',
1869 ob->command_timeout))
1870 {
1871 if ( errno != 0
1872 || buffer2[0] == 0
1873 || (buffer2[0] == '4' && !ob->tls_tempfail_tryclear)
1874 )
1875 {
1876 Ustrncpy(buffer, buffer2, sizeof(buffer));
1877 goto RESPONSE_FAILED;
1878 }
1879 }
1880
1881 /* STARTTLS accepted: try to negotiate a TLS session. */
1882
1883 else
1884 TLS_NEGOTIATE:
1885 {
1886 int rc = tls_client_start(inblock.sock, host, addrlist, tblock
1887 # ifdef EXPERIMENTAL_DANE
1888 , dane ? &tlsa_dnsa : NULL
1889 # endif
1890 );
1891
1892 /* TLS negotiation failed; give an error. From outside, this function may
1893 be called again to try in clear on a new connection, if the options permit
1894 it for this host. */
1895
1896 if (rc != OK)
1897 {
1898 # ifdef EXPERIMENTAL_DANE
1899 if (rc == DEFER && dane)
1900 {
1901 log_write(0, LOG_MAIN,
1902 "DANE attempt failed; no TLS connection to %s [%s]",
1903 host->name, host->address);
1904 }
1905 # endif
1906
1907 save_errno = ERRNO_TLSFAILURE;
1908 message = US"failure while setting up TLS session";
1909 send_quit = FALSE;
1910 goto TLS_FAILED;
1911 }
1912
1913 /* TLS session is set up */
1914
1915 smtp_peer_options_wrap = smtp_peer_options;
1916 for (addr = addrlist; addr; addr = addr->next)
1917 if (addr->transport_return == PENDING_DEFER)
1918 {
1919 addr->cipher = tls_out.cipher;
1920 addr->ourcert = tls_out.ourcert;
1921 addr->peercert = tls_out.peercert;
1922 addr->peerdn = tls_out.peerdn;
1923 addr->ocsp = tls_out.ocsp;
1924 }
1925 }
1926 }
1927
1928 /* if smtps, we'll have smtp_command set to something else; always safe to
1929 reset it here. */
1930 smtp_command = big_buffer;
1931
1932 /* If we started TLS, redo the EHLO/LHLO exchange over the secure channel. If
1933 helo_data is null, we are dealing with a connection that was passed from
1934 another process, and so we won't have expanded helo_data above. We have to
1935 expand it here. $sending_ip_address and $sending_port are set up right at the
1936 start of the Exim process (in exim.c). */
1937
1938 if (tls_out.active >= 0)
1939 {
1940 char *greeting_cmd;
1941 BOOL good_response;
1942
1943 if (helo_data == NULL)
1944 {
1945 helo_data = expand_string(ob->helo_data);
1946 if (helo_data == NULL)
1947 {
1948 uschar *message = string_sprintf("failed to expand helo_data: %s",
1949 expand_string_message);
1950 set_errno_nohost(addrlist, ERRNO_EXPANDFAIL, message, DEFER, FALSE);
1951 yield = DEFER;
1952 goto SEND_QUIT;
1953 }
1954 }
1955
1956 /* For SMTPS we need to wait for the initial OK response. */
1957 if (smtps)
1958 {
1959 good_response = smtp_read_response(&inblock, buffer, sizeof(buffer),
1960 '2', ob->command_timeout);
1961 #ifdef EXPERIMENTAL_DSN_INFO
1962 smtp_greeting = string_copy(buffer);
1963 #endif
1964 if (!good_response) goto RESPONSE_FAILED;
1965 }
1966
1967 if (esmtp)
1968 greeting_cmd = "EHLO";
1969 else
1970 {
1971 greeting_cmd = "HELO";
1972 DEBUG(D_transport)
1973 debug_printf("not sending EHLO (host matches hosts_avoid_esmtp)\n");
1974 }
1975
1976 if (smtp_write_command(&outblock, FALSE, "%s %s\r\n",
1977 lmtp? "LHLO" : greeting_cmd, helo_data) < 0)
1978 goto SEND_FAILED;
1979 good_response = smtp_read_response(&inblock, buffer, sizeof(buffer),
1980 '2', ob->command_timeout);
1981 #ifdef EXPERIMENTAL_DSN_INFO
1982 helo_response = string_copy(buffer);
1983 #endif
1984 if (!good_response) goto RESPONSE_FAILED;
1985 smtp_peer_options = 0;
1986 }
1987
1988 /* If the host is required to use a secure channel, ensure that we
1989 have one. */
1990
1991 else if ( smtps
1992 # ifdef EXPERIMENTAL_DANE
1993 || dane
1994 # endif
1995 || verify_check_given_host(&ob->hosts_require_tls, host) == OK
1996 )
1997 {
1998 save_errno = ERRNO_TLSREQUIRED;
1999 message = string_sprintf("a TLS session is required, but %s",
2000 smtp_peer_options & PEER_OFFERED_TLS
2001 ? "an attempt to start TLS failed" : "the server did not offer TLS support");
2002 goto TLS_FAILED;
2003 }
2004 #endif /*SUPPORT_TLS*/
2005
2006 /* If TLS is active, we have just started it up and re-done the EHLO command,
2007 so its response needs to be analyzed. If TLS is not active and this is a
2008 continued session down a previously-used socket, we haven't just done EHLO, so
2009 we skip this. */
2010
2011 if (continue_hostname == NULL
2012 #ifdef SUPPORT_TLS
2013 || tls_out.active >= 0
2014 #endif
2015 )
2016 {
2017 if (esmtp || lmtp)
2018 {
2019 peer_offered = ehlo_response(buffer, Ustrlen(buffer),
2020 0 /* no TLS */
2021 | (lmtp && ob->lmtp_ignore_quota ? PEER_OFFERED_IGNQ : 0)
2022 | PEER_OFFERED_CHUNKING
2023 | PEER_OFFERED_PRDR
2024 #ifdef SUPPORT_I18N
2025 | (addrlist->prop.utf8_msg ? PEER_OFFERED_UTF8 : 0)
2026 /*XXX if we hand peercaps on to continued-conn processes,
2027 must not depend on this addr */
2028 #endif
2029 | PEER_OFFERED_DSN
2030 | PEER_OFFERED_PIPE
2031 | (ob->size_addition >= 0 ? PEER_OFFERED_SIZE : 0)
2032 );
2033
2034 /* Set for IGNOREQUOTA if the response to LHLO specifies support and the
2035 lmtp_ignore_quota option was set. */
2036
2037 igquotstr = peer_offered & PEER_OFFERED_IGNQ ? US" IGNOREQUOTA" : US"";
2038
2039 /* If the response to EHLO specified support for the SIZE parameter, note
2040 this, provided size_addition is non-negative. */
2041
2042 smtp_peer_options |= peer_offered & PEER_OFFERED_SIZE;
2043
2044 /* Note whether the server supports PIPELINING. If hosts_avoid_esmtp matched
2045 the current host, esmtp will be false, so PIPELINING can never be used. If
2046 the current host matches hosts_avoid_pipelining, don't do it. */
2047
2048 if ( peer_offered & PEER_OFFERED_PIPE
2049 && verify_check_given_host(&ob->hosts_avoid_pipelining, host) != OK)
2050 smtp_peer_options |= PEER_OFFERED_PIPE;
2051
2052 DEBUG(D_transport) debug_printf("%susing PIPELINING\n",
2053 smtp_peer_options & PEER_OFFERED_PIPE ? "" : "not ");
2054
2055 if ( peer_offered & PEER_OFFERED_CHUNKING
2056 && verify_check_given_host(&ob->hosts_try_chunking, host) != OK)
2057 peer_offered &= ~PEER_OFFERED_CHUNKING;
2058
2059 if (peer_offered & PEER_OFFERED_CHUNKING)
2060 {DEBUG(D_transport) debug_printf("CHUNKING usable\n");}
2061
2062 #ifndef DISABLE_PRDR
2063 if ( peer_offered & PEER_OFFERED_PRDR
2064 && verify_check_given_host(&ob->hosts_try_prdr, host) != OK)
2065 peer_offered &= ~PEER_OFFERED_PRDR;
2066
2067 if (peer_offered & PEER_OFFERED_PRDR)
2068 {DEBUG(D_transport) debug_printf("PRDR usable\n");}
2069 #endif
2070
2071 /* Note if the server supports DSN */
2072 smtp_peer_options |= peer_offered & PEER_OFFERED_DSN;
2073 DEBUG(D_transport) debug_printf("%susing DSN\n",
2074 peer_offered & PEER_OFFERED_DSN ? "" : "not ");
2075
2076 /* Note if the response to EHLO specifies support for the AUTH extension.
2077 If it has, check that this host is one we want to authenticate to, and do
2078 the business. The host name and address must be available when the
2079 authenticator's client driver is running. */
2080
2081 switch (yield = smtp_auth(buffer, sizeof(buffer), addrlist, host,
2082 ob, esmtp, &inblock, &outblock))
2083 {
2084 default: goto SEND_QUIT;
2085 case OK: break;
2086 case FAIL_SEND: goto SEND_FAILED;
2087 case FAIL: goto RESPONSE_FAILED;
2088 }
2089 }
2090 }
2091 pipelining_active = !!(smtp_peer_options & PEER_OFFERED_PIPE);
2092
2093 /* The setting up of the SMTP call is now complete. Any subsequent errors are
2094 message-specific. */
2095
2096 setting_up = FALSE;
2097
2098 #ifdef SUPPORT_I18N
2099 if (addrlist->prop.utf8_msg)
2100 {
2101 utf8_needed = !addrlist->prop.utf8_downcvt
2102 && !addrlist->prop.utf8_downcvt_maybe;
2103 DEBUG(D_transport) if (!utf8_needed) debug_printf("utf8: %s downconvert\n",
2104 addrlist->prop.utf8_downcvt ? "mandatory" : "optional");
2105 }
2106
2107 /* If this is an international message we need the host to speak SMTPUTF8 */
2108 if (utf8_needed && !(peer_offered & PEER_OFFERED_UTF8))
2109 {
2110 errno = ERRNO_UTF8_FWD;
2111 goto RESPONSE_FAILED;
2112 }
2113 #endif
2114
2115 /* If there is a filter command specified for this transport, we can now
2116 set it up. This cannot be done until the identify of the host is known. */
2117
2118 if (tblock->filter_command != NULL)
2119 {
2120 BOOL rc;
2121 uschar buffer[64];
2122 sprintf(CS buffer, "%.50s transport", tblock->name);
2123 rc = transport_set_up_command(&transport_filter_argv, tblock->filter_command,
2124 TRUE, DEFER, addrlist, buffer, NULL);
2125 transport_filter_timeout = tblock->filter_timeout;
2126
2127 /* On failure, copy the error to all addresses, abandon the SMTP call, and
2128 yield ERROR. */
2129
2130 if (!rc)
2131 {
2132 set_errno_nohost(addrlist->next, addrlist->basic_errno, addrlist->message, DEFER,
2133 FALSE);
2134 yield = ERROR;
2135 goto SEND_QUIT;
2136 }
2137
2138 if ( transport_filter_argv
2139 && *transport_filter_argv
2140 && **transport_filter_argv
2141 && peer_offered & PEER_OFFERED_CHUNKING
2142 )
2143 {
2144 peer_offered &= ~PEER_OFFERED_CHUNKING;
2145 DEBUG(D_transport) debug_printf("CHUNKING not usable due to transport filter\n");
2146 }
2147 }
2148
2149
2150 /* For messages that have more than the maximum number of envelope recipients,
2151 we want to send several transactions down the same SMTP connection. (See
2152 comments in deliver.c as to how this reconciles, heuristically, with
2153 remote_max_parallel.) This optimization was added to Exim after the following
2154 code was already working. The simplest way to put it in without disturbing the
2155 code was to use a goto to jump back to this point when there is another
2156 transaction to handle. */
2157
2158 SEND_MESSAGE:
2159 sync_addr = first_addr;
2160 address_count = 0;
2161 ok = FALSE;
2162 send_rset = TRUE;
2163 completed_address = FALSE;
2164
2165
2166 /* Initiate a message transfer. If we know the receiving MTA supports the SIZE
2167 qualification, send it, adding something to the message size to allow for
2168 imprecision and things that get added en route. Exim keeps the number of lines
2169 in a message, so we can give an accurate value for the original message, but we
2170 need some additional to handle added headers. (Double "." characters don't get
2171 included in the count.) */
2172
2173 p = buffer;
2174 *p = 0;
2175
2176 if (peer_offered & PEER_OFFERED_SIZE)
2177 {
2178 sprintf(CS p, " SIZE=%d", message_size+message_linecount+ob->size_addition);
2179 while (*p) p++;
2180 }
2181
2182 #ifndef DISABLE_PRDR
2183 prdr_active = FALSE;
2184 if (peer_offered & PEER_OFFERED_PRDR)
2185 for (addr = first_addr; addr; addr = addr->next)
2186 if (addr->transport_return == PENDING_DEFER)
2187 {
2188 for (addr = addr->next; addr; addr = addr->next)
2189 if (addr->transport_return == PENDING_DEFER)
2190 { /* at least two recipients to send */
2191 prdr_active = TRUE;
2192 sprintf(CS p, " PRDR"); p += 5;
2193 break;
2194 }
2195 break;
2196 }
2197 #endif
2198
2199 #ifdef SUPPORT_I18N
2200 if ( addrlist->prop.utf8_msg
2201 && !addrlist->prop.utf8_downcvt
2202 && peer_offered & PEER_OFFERED_UTF8
2203 )
2204 sprintf(CS p, " SMTPUTF8"), p += 9;
2205 #endif
2206
2207 /* check if all addresses have lasthop flag */
2208 /* do not send RET and ENVID if true */
2209 for (dsn_all_lasthop = TRUE, addr = first_addr;
2210 address_count < max_rcpt && addr != NULL;
2211 addr = addr->next)
2212 if ((addr->dsn_flags & rf_dsnlasthop) != 1)
2213 {
2214 dsn_all_lasthop = FALSE;
2215 break;
2216 }
2217
2218 /* Add any DSN flags to the mail command */
2219
2220 if (peer_offered & PEER_OFFERED_DSN && !dsn_all_lasthop)
2221 {
2222 if (dsn_ret == dsn_ret_hdrs)
2223 { Ustrcpy(p, " RET=HDRS"); p += 9; }
2224 else if (dsn_ret == dsn_ret_full)
2225 { Ustrcpy(p, " RET=FULL"); p += 9; }
2226
2227 if (dsn_envid)
2228 {
2229 string_format(p, sizeof(buffer) - (p-buffer), " ENVID=%s", dsn_envid);
2230 while (*p) p++;
2231 }
2232 }
2233
2234 /* If an authenticated_sender override has been specified for this transport
2235 instance, expand it. If the expansion is forced to fail, and there was already
2236 an authenticated_sender for this message, the original value will be used.
2237 Other expansion failures are serious. An empty result is ignored, but there is
2238 otherwise no check - this feature is expected to be used with LMTP and other
2239 cases where non-standard addresses (e.g. without domains) might be required. */
2240
2241 if (smtp_mail_auth_str(p, sizeof(buffer) - (p-buffer), addrlist, ob))
2242 {
2243 yield = ERROR;
2244 goto SEND_QUIT;
2245 }
2246
2247 /* From here until we send the DATA command, we can make use of PIPELINING
2248 if the server host supports it. The code has to be able to check the responses
2249 at any point, for when the buffer fills up, so we write it totally generally.
2250 When PIPELINING is off, each command written reports that it has flushed the
2251 buffer. */
2252
2253 pending_MAIL = TRUE; /* The block starts with MAIL */
2254
2255 {
2256 uschar * s = return_path;
2257 #ifdef SUPPORT_I18N
2258 uschar * errstr = NULL;
2259
2260 /* If we must downconvert, do the from-address here. Remember we had to
2261 for the to-addresses (done below), and also (ugly) for re-doing when building
2262 the delivery log line. */
2263
2264 if ( addrlist->prop.utf8_msg
2265 && (addrlist->prop.utf8_downcvt || !(peer_offered & PEER_OFFERED_UTF8))
2266 )
2267 {
2268 if (s = string_address_utf8_to_alabel(return_path, &errstr), errstr)
2269 {
2270 set_errno_nohost(addrlist, ERRNO_EXPANDFAIL, errstr, DEFER, FALSE);
2271 yield = ERROR;
2272 goto SEND_QUIT;
2273 }
2274 setflag(addrlist, af_utf8_downcvt);
2275 }
2276 #endif
2277
2278 rc = smtp_write_command(&outblock, pipelining_active,
2279 "MAIL FROM:<%s>%s\r\n", s, buffer);
2280 }
2281
2282 mail_command = string_copy(big_buffer); /* Save for later error message */
2283
2284 switch(rc)
2285 {
2286 case -1: /* Transmission error */
2287 goto SEND_FAILED;
2288
2289 case +1: /* Block was sent */
2290 if (!smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
2291 ob->command_timeout))
2292 {
2293 if (errno == 0 && buffer[0] == '4')
2294 {
2295 errno = ERRNO_MAIL4XX;
2296 addrlist->more_errno |= ((buffer[1] - '0')*10 + buffer[2] - '0') << 8;
2297 }
2298 goto RESPONSE_FAILED;
2299 }
2300 pending_MAIL = FALSE;
2301 break;
2302 }
2303
2304 /* Pass over all the relevant recipient addresses for this host, which are the
2305 ones that have status PENDING_DEFER. If we are using PIPELINING, we can send
2306 several before we have to read the responses for those seen so far. This
2307 checking is done by a subroutine because it also needs to be done at the end.
2308 Send only up to max_rcpt addresses at a time, leaving first_addr pointing to
2309 the next one if not all are sent.
2310
2311 In the MUA wrapper situation, we want to flush the PIPELINING buffer for the
2312 last address because we want to abort if any recipients have any kind of
2313 problem, temporary or permanent. We know that all recipient addresses will have
2314 the PENDING_DEFER status, because only one attempt is ever made, and we know
2315 that max_rcpt will be large, so all addresses will be done at once. */
2316
2317 for (addr = first_addr;
2318 addr && address_count < max_rcpt;
2319 addr = addr->next)
2320 {
2321 int count;
2322 BOOL no_flush;
2323 uschar * rcpt_addr;
2324
2325 addr->dsn_aware = peer_offered & PEER_OFFERED_DSN
2326 ? dsn_support_yes : dsn_support_no;
2327
2328 if (addr->transport_return != PENDING_DEFER) continue;
2329
2330 address_count++;
2331 no_flush = pipelining_active && (!mua_wrapper || addr->next);
2332
2333 /* Add any DSN flags to the rcpt command and add to the sent string */
2334
2335 p = buffer;
2336 *p = 0;
2337
2338 if (peer_offered & PEER_OFFERED_DSN && !(addr->dsn_flags & rf_dsnlasthop))
2339 {
2340 if (addr->dsn_flags & rf_dsnflags)
2341 {
2342 int i;
2343 BOOL first = TRUE;
2344 Ustrcpy(p, " NOTIFY=");
2345 while (*p) p++;
2346 for (i = 0; i < 4; i++)
2347 if ((addr->dsn_flags & rf_list[i]) != 0)
2348 {
2349 if (!first) *p++ = ',';
2350 first = FALSE;
2351 Ustrcpy(p, rf_names[i]);
2352 while (*p) p++;
2353 }
2354 }
2355
2356 if (addr->dsn_orcpt)
2357 {
2358 string_format(p, sizeof(buffer) - (p-buffer), " ORCPT=%s",
2359 addr->dsn_orcpt);
2360 while (*p) p++;
2361 }
2362 }
2363
2364 /* Now send the RCPT command, and process outstanding responses when
2365 necessary. After a timeout on RCPT, we just end the function, leaving the
2366 yield as OK, because this error can often mean that there is a problem with
2367 just one address, so we don't want to delay the host. */
2368
2369 rcpt_addr = transport_rcpt_address(addr, tblock->rcpt_include_affixes);
2370
2371 #ifdef SUPPORT_I18N
2372 {
2373 uschar * dummy_errstr;
2374 if ( testflag(addrlist, af_utf8_downcvt)
2375 && (rcpt_addr = string_address_utf8_to_alabel(rcpt_addr, &dummy_errstr),
2376 dummy_errstr
2377 ) )
2378 {
2379 errno = ERRNO_EXPANDFAIL;
2380 goto SEND_FAILED;
2381 }
2382 }
2383 #endif
2384
2385 count = smtp_write_command(&outblock, no_flush, "RCPT TO:<%s>%s%s\r\n",
2386 rcpt_addr, igquotstr, buffer);
2387
2388 if (count < 0) goto SEND_FAILED;
2389 if (count > 0)
2390 {
2391 switch(sync_responses(first_addr, tblock->rcpt_include_affixes,
2392 &sync_addr, host, count, ob->address_retry_include_sender,
2393 pending_MAIL, 0, &inblock, ob->command_timeout, buffer,
2394 sizeof(buffer)))
2395 {
2396 case 3: ok = TRUE; /* 2xx & 5xx => OK & progress made */
2397 case 2: completed_address = TRUE; /* 5xx (only) => progress made */
2398 break;
2399
2400 case 1: ok = TRUE; /* 2xx (only) => OK, but if LMTP, */
2401 if (!lmtp) completed_address = TRUE; /* can't tell about progress yet */
2402 case 0: /* No 2xx or 5xx, but no probs */
2403 break;
2404
2405 case -1: goto END_OFF; /* Timeout on RCPT */
2406 default: goto RESPONSE_FAILED; /* I/O error, or any MAIL error */
2407 }
2408 pending_MAIL = FALSE; /* Dealt with MAIL */
2409 }
2410 } /* Loop for next address */
2411
2412 /* If we are an MUA wrapper, abort if any RCPTs were rejected, either
2413 permanently or temporarily. We should have flushed and synced after the last
2414 RCPT. */
2415
2416 if (mua_wrapper)
2417 {
2418 address_item *badaddr;
2419 for (badaddr = first_addr; badaddr; badaddr = badaddr->next)
2420 if (badaddr->transport_return != PENDING_OK)
2421 {
2422 /*XXX could we find a better errno than 0 here? */
2423 set_errno_nohost(addrlist, 0, badaddr->message, FAIL,
2424 testflag(badaddr, af_pass_message));
2425 ok = FALSE;
2426 break;
2427 }
2428 }
2429
2430 /* If ok is TRUE, we know we have got at least one good recipient, and must now
2431 send DATA, but if it is FALSE (in the normal, non-wrapper case), we may still
2432 have a good recipient buffered up if we are pipelining. We don't want to waste
2433 time sending DATA needlessly, so we only send it if either ok is TRUE or if we
2434 are pipelining. The responses are all handled by sync_responses().
2435 If using CHUNKING, do not send a BDAT until we know how big a chunk we want
2436 to send is. */
2437
2438 if ( !(peer_offered & PEER_OFFERED_CHUNKING)
2439 && (ok || (pipelining_active && !mua_wrapper)))
2440 {
2441 int count = smtp_write_command(&outblock, FALSE, "DATA\r\n");
2442
2443 if (count < 0) goto SEND_FAILED;
2444 switch(sync_responses(first_addr, tblock->rcpt_include_affixes, &sync_addr,
2445 host, count, ob->address_retry_include_sender, pending_MAIL,
2446 ok ? +1 : -1, &inblock, ob->command_timeout, buffer, sizeof(buffer)))
2447 {
2448 case 3: ok = TRUE; /* 2xx & 5xx => OK & progress made */
2449 case 2: completed_address = TRUE; /* 5xx (only) => progress made */
2450 break;
2451
2452 case 1: ok = TRUE; /* 2xx (only) => OK, but if LMTP, */
2453 if (!lmtp) completed_address = TRUE; /* can't tell about progress yet */
2454 case 0: break; /* No 2xx or 5xx, but no probs */
2455
2456 case -1: goto END_OFF; /* Timeout on RCPT */
2457 default: goto RESPONSE_FAILED; /* I/O error, or any MAIL/DATA error */
2458 }
2459 pipelining_active = FALSE;
2460 }
2461
2462 /* If there were no good recipients (but otherwise there have been no
2463 problems), just set ok TRUE, since we have handled address-specific errors
2464 already. Otherwise, it's OK to send the message. Use the check/escape mechanism
2465 for handling the SMTP dot-handling protocol, flagging to apply to headers as
2466 well as body. Set the appropriate timeout value to be used for each chunk.
2467 (Haven't been able to make it work using select() for writing yet.) */
2468
2469 if (!(peer_offered & PEER_OFFERED_CHUNKING) && !ok)
2470 {
2471 /* Save the first address of the next batch. */
2472 first_addr = addr;
2473
2474 ok = TRUE;
2475 }
2476 else
2477 {
2478 transport_ctx tctx = {
2479 tblock,
2480 addrlist,
2481 US".", US"..", /* Escaping strings */
2482 topt_use_crlf | topt_escape_headers
2483 | (tblock->body_only ? topt_no_headers : 0)
2484 | (tblock->headers_only ? topt_no_body : 0)
2485 | (tblock->return_path_add ? topt_add_return_path : 0)
2486 | (tblock->delivery_date_add ? topt_add_delivery_date : 0)
2487 | (tblock->envelope_to_add ? topt_add_envelope_to : 0)
2488 };
2489
2490 /* If using CHUNKING we need a callback from the generic transport
2491 support to us, for the sending of BDAT smtp commands and the reaping
2492 of responses. The callback needs a whole bunch of state so set up
2493 a transport-context structure to be passed around. */
2494
2495 if (peer_offered & PEER_OFFERED_CHUNKING)
2496 {
2497 tctx.check_string = tctx.escape_string = NULL;
2498 tctx.options |= topt_use_bdat;
2499 tctx.chunk_cb = smtp_chunk_cmd_callback;
2500 tctx.inblock = &inblock;
2501 tctx.outblock = &outblock;
2502 tctx.host = host;
2503 tctx.first_addr = first_addr;
2504 tctx.sync_addr = &sync_addr;
2505 tctx.pending_MAIL = pending_MAIL;
2506 tctx.pending_BDAT = FALSE;
2507 tctx.good_RCPT = ok;
2508 tctx.completed_address = &completed_address;
2509 tctx.cmd_count = 0;
2510 tctx.buffer = buffer;
2511 }
2512 else
2513 tctx.options |= topt_end_dot;
2514
2515 /* Save the first address of the next batch. */
2516 first_addr = addr;
2517
2518 /* Responses from CHUNKING commands go in buffer. Otherwise,
2519 there has not been a response. */
2520
2521 buffer[0] = 0;
2522
2523 sigalrm_seen = FALSE;
2524 transport_write_timeout = ob->data_timeout;
2525 smtp_command = US"sending data block"; /* For error messages */
2526 DEBUG(D_transport|D_v)
2527 if (peer_offered & PEER_OFFERED_CHUNKING)
2528 debug_printf(" will write message using CHUNKING\n");
2529 else
2530 debug_printf(" SMTP>> writing message and terminating \".\"\n");
2531 transport_count = 0;
2532
2533 #ifndef DISABLE_DKIM
2534 ok = dkim_transport_write_message(inblock.sock, &tctx, &ob->dkim);
2535 #else
2536 ok = transport_write_message(inblock.sock, &tctx, 0);
2537 #endif
2538
2539 /* transport_write_message() uses write() because it is called from other
2540 places to write to non-sockets. This means that under some OS (e.g. Solaris)
2541 it can exit with "Broken pipe" as its error. This really means that the
2542 socket got closed at the far end. */
2543
2544 transport_write_timeout = 0; /* for subsequent transports */
2545
2546 /* Failure can either be some kind of I/O disaster (including timeout),
2547 or the failure of a transport filter or the expansion of added headers.
2548 Or, when CHUNKING, it can be a protocol-detected failure. */
2549
2550 if (!ok)
2551 goto RESPONSE_FAILED;
2552
2553 /* We used to send the terminating "." explicitly here, but because of
2554 buffering effects at both ends of TCP/IP connections, you don't gain
2555 anything by keeping it separate, so it might as well go in the final
2556 data buffer for efficiency. This is now done by setting the topt_end_dot
2557 flag above. */
2558
2559 smtp_command = US"end of data";
2560
2561 if (peer_offered & PEER_OFFERED_CHUNKING && tctx.cmd_count > 1)
2562 {
2563 /* Reap any outstanding MAIL & RCPT commands, but not a DATA-go-ahead */
2564 switch(sync_responses(first_addr, tblock->rcpt_include_affixes, &sync_addr,
2565 host, tctx.cmd_count-1, ob->address_retry_include_sender,
2566 pending_MAIL, 0,
2567 &inblock, ob->command_timeout, buffer, sizeof(buffer)))
2568 {
2569 case 3: ok = TRUE; /* 2xx & 5xx => OK & progress made */
2570 case 2: completed_address = TRUE; /* 5xx (only) => progress made */
2571 break;
2572
2573 case 1: ok = TRUE; /* 2xx (only) => OK, but if LMTP, */
2574 if (!lmtp) completed_address = TRUE; /* can't tell about progress yet */
2575 case 0: break; /* No 2xx or 5xx, but no probs */
2576
2577 case -1: goto END_OFF; /* Timeout on RCPT */
2578 default: goto RESPONSE_FAILED; /* I/O error, or any MAIL/DATA error */
2579 }
2580 }
2581
2582 #ifndef DISABLE_PRDR
2583 /* For PRDR we optionally get a partial-responses warning
2584 * followed by the individual responses, before going on with
2585 * the overall response. If we don't get the warning then deal
2586 * with per non-PRDR. */
2587 if(prdr_active)
2588 {
2589 ok = smtp_read_response(&inblock, buffer, sizeof(buffer), '3',
2590 ob->final_timeout);
2591 if (!ok && errno == 0) switch(buffer[0])
2592 {
2593 case '2': prdr_active = FALSE;
2594 ok = TRUE;
2595 break;
2596 case '4': errno = ERRNO_DATA4XX;
2597 addrlist->more_errno |=
2598 ((buffer[1] - '0')*10 + buffer[2] - '0') << 8;
2599 break;
2600 }
2601 }
2602 else
2603 #endif
2604
2605 /* For non-PRDR SMTP, we now read a single response that applies to the
2606 whole message. If it is OK, then all the addresses have been delivered. */
2607
2608 if (!lmtp)
2609 {
2610 ok = smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
2611 ob->final_timeout);
2612 if (!ok && errno == 0 && buffer[0] == '4')
2613 {
2614 errno = ERRNO_DATA4XX;
2615 addrlist->more_errno |= ((buffer[1] - '0')*10 + buffer[2] - '0') << 8;
2616 }
2617 }
2618
2619 /* For LMTP, we get back a response for every RCPT command that we sent;
2620 some may be accepted and some rejected. For those that get a response, their
2621 status is fixed; any that are accepted have been handed over, even if later
2622 responses crash - at least, that's how I read RFC 2033.
2623
2624 If all went well, mark the recipient addresses as completed, record which
2625 host/IPaddress they were delivered to, and cut out RSET when sending another
2626 message down the same channel. Write the completed addresses to the journal
2627 now so that they are recorded in case there is a crash of hardware or
2628 software before the spool gets updated. Also record the final SMTP
2629 confirmation if needed (for SMTP only). */
2630
2631 if (ok)
2632 {
2633 int flag = '=';
2634 int delivery_time = (int)(time(NULL) - start_delivery_time);
2635 int len;
2636 uschar *conf = NULL;
2637
2638 send_rset = FALSE;
2639 pipelining_active = FALSE;
2640
2641 /* Set up confirmation if needed - applies only to SMTP */
2642
2643 if (
2644 #ifdef DISABLE_EVENT
2645 LOGGING(smtp_confirmation) &&
2646 #endif
2647 !lmtp
2648 )
2649 {
2650 const uschar *s = string_printing(buffer);
2651 /* deconst cast ok here as string_printing was checked to have alloc'n'copied */
2652 conf = (s == buffer)? (uschar *)string_copy(s) : US s;
2653 }
2654
2655 /* Process all transported addresses - for LMTP or PRDR, read a status for
2656 each one. */
2657
2658 for (addr = addrlist; addr != first_addr; addr = addr->next)
2659 {
2660 if (addr->transport_return != PENDING_OK) continue;
2661
2662 /* LMTP - if the response fails badly (e.g. timeout), use it for all the
2663 remaining addresses. Otherwise, it's a return code for just the one
2664 address. For temporary errors, add a retry item for the address so that
2665 it doesn't get tried again too soon. */
2666
2667 #ifndef DISABLE_PRDR
2668 if (lmtp || prdr_active)
2669 #else
2670 if (lmtp)
2671 #endif
2672 {
2673 if (!smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
2674 ob->final_timeout))
2675 {
2676 if (errno != 0 || buffer[0] == 0) goto RESPONSE_FAILED;
2677 addr->message = string_sprintf(
2678 #ifndef DISABLE_PRDR
2679 "%s error after %s: %s", prdr_active ? "PRDR":"LMTP",
2680 #else
2681 "LMTP error after %s: %s",
2682 #endif
2683 big_buffer, string_printing(buffer));
2684 setflag(addr, af_pass_message); /* Allow message to go to user */
2685 if (buffer[0] == '5')
2686 addr->transport_return = FAIL;
2687 else
2688 {
2689 errno = ERRNO_DATA4XX;
2690 addr->more_errno |= ((buffer[1] - '0')*10 + buffer[2] - '0') << 8;
2691 addr->transport_return = DEFER;
2692 #ifndef DISABLE_PRDR
2693 if (!prdr_active)
2694 #endif
2695 retry_add_item(addr, addr->address_retry_key, 0);
2696 }
2697 continue;
2698 }
2699 completed_address = TRUE; /* NOW we can set this flag */
2700 if (LOGGING(smtp_confirmation))
2701 {
2702 const uschar *s = string_printing(buffer);
2703 /* deconst cast ok here as string_printing was checked to have alloc'n'copied */
2704 conf = (s == buffer)? (uschar *)string_copy(s) : US s;
2705 }
2706 }
2707
2708 /* SMTP, or success return from LMTP for this address. Pass back the
2709 actual host that was used. */
2710
2711 addr->transport_return = OK;
2712 addr->more_errno = delivery_time;
2713 addr->host_used = host;
2714 addr->special_action = flag;
2715 addr->message = conf;
2716 #ifndef DISABLE_PRDR
2717 if (prdr_active) addr->flags |= af_prdr_used;
2718 #endif
2719 if (peer_offered & PEER_OFFERED_CHUNKING) addr->flags |= af_chunking_used;
2720 flag = '-';
2721
2722 #ifndef DISABLE_PRDR
2723 if (!prdr_active)
2724 #endif
2725 {
2726 /* Update the journal. For homonymic addresses, use the base address plus
2727 the transport name. See lots of comments in deliver.c about the reasons
2728 for the complications when homonyms are involved. Just carry on after
2729 write error, as it may prove possible to update the spool file later. */
2730
2731 if (testflag(addr, af_homonym))
2732 sprintf(CS buffer, "%.500s/%s\n", addr->unique + 3, tblock->name);
2733 else
2734 sprintf(CS buffer, "%.500s\n", addr->unique);
2735
2736 DEBUG(D_deliver) debug_printf("journalling %s\n", buffer);
2737 len = Ustrlen(CS buffer);
2738 if (write(journal_fd, buffer, len) != len)
2739 log_write(0, LOG_MAIN|LOG_PANIC, "failed to write journal for "
2740 "%s: %s", buffer, strerror(errno));
2741 }
2742 }
2743
2744 #ifndef DISABLE_PRDR
2745 if (prdr_active)
2746 {
2747 /* PRDR - get the final, overall response. For any non-success
2748 upgrade all the address statuses. */
2749 ok = smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
2750 ob->final_timeout);
2751 if (!ok)
2752 {
2753 if(errno == 0 && buffer[0] == '4')
2754 {
2755 errno = ERRNO_DATA4XX;
2756 addrlist->more_errno |= ((buffer[1] - '0')*10 + buffer[2] - '0') << 8;
2757 }
2758 for (addr = addrlist; addr != first_addr; addr = addr->next)
2759 if (buffer[0] == '5' || addr->transport_return == OK)
2760 addr->transport_return = PENDING_OK; /* allow set_errno action */
2761 goto RESPONSE_FAILED;
2762 }
2763
2764 /* Update the journal, or setup retry. */
2765 for (addr = addrlist; addr != first_addr; addr = addr->next)
2766 if (addr->transport_return == OK)
2767 {
2768 if (testflag(addr, af_homonym))
2769 sprintf(CS buffer, "%.500s/%s\n", addr->unique + 3, tblock->name);
2770 else
2771 sprintf(CS buffer, "%.500s\n", addr->unique);
2772
2773 DEBUG(D_deliver) debug_printf("journalling(PRDR) %s\n", buffer);
2774 len = Ustrlen(CS buffer);
2775 if (write(journal_fd, buffer, len) != len)
2776 log_write(0, LOG_MAIN|LOG_PANIC, "failed to write journal for "
2777 "%s: %s", buffer, strerror(errno));
2778 }
2779 else if (addr->transport_return == DEFER)
2780 retry_add_item(addr, addr->address_retry_key, -2);
2781 }
2782 #endif
2783
2784 /* Ensure the journal file is pushed out to disk. */
2785
2786 if (EXIMfsync(journal_fd) < 0)
2787 log_write(0, LOG_MAIN|LOG_PANIC, "failed to fsync journal: %s",
2788 strerror(errno));
2789 }
2790 }
2791
2792
2793 /* Handle general (not specific to one address) failures here. The value of ok
2794 is used to skip over this code on the falling through case. A timeout causes a
2795 deferral. Other errors may defer or fail according to the response code, and
2796 may set up a special errno value, e.g. after connection chopped, which is
2797 assumed if errno == 0 and there is no text in the buffer. If control reaches
2798 here during the setting up phase (i.e. before MAIL FROM) then always defer, as
2799 the problem is not related to this specific message. */
2800
2801 if (!ok)
2802 {
2803 int code, set_rc;
2804 uschar * set_message;
2805
2806 RESPONSE_FAILED:
2807 {
2808 save_errno = errno;
2809 message = NULL;
2810 send_quit = check_response(host, &save_errno, addrlist->more_errno,
2811 buffer, &code, &message, &pass_message);
2812 goto FAILED;
2813 }
2814
2815 SEND_FAILED:
2816 {
2817 save_errno = errno;
2818 code = '4';
2819 message = US string_sprintf("send() to %s [%s] failed: %s",
2820 host->name, host->address, strerror(save_errno));
2821 send_quit = FALSE;
2822 goto FAILED;
2823 }
2824
2825 /* This label is jumped to directly when a TLS negotiation has failed,
2826 or was not done for a host for which it is required. Values will be set
2827 in message and save_errno, and setting_up will always be true. Treat as
2828 a temporary error. */
2829
2830 #ifdef SUPPORT_TLS
2831 TLS_FAILED:
2832 code = '4';
2833 #endif
2834
2835 /* If the failure happened while setting up the call, see if the failure was
2836 a 5xx response (this will either be on connection, or following HELO - a 5xx
2837 after EHLO causes it to try HELO). If so, fail all addresses, as this host is
2838 never going to accept them. For other errors during setting up (timeouts or
2839 whatever), defer all addresses, and yield DEFER, so that the host is not
2840 tried again for a while. */
2841
2842 FAILED:
2843 ok = FALSE; /* For when reached by GOTO */
2844 set_message = message;
2845
2846 if (setting_up)
2847 {
2848 if (code == '5')
2849 set_rc = FAIL;
2850 else
2851 yield = set_rc = DEFER;
2852 }
2853
2854 /* We want to handle timeouts after MAIL or "." and loss of connection after
2855 "." specially. They can indicate a problem with the sender address or with
2856 the contents of the message rather than a real error on the connection. These
2857 cases are treated in the same way as a 4xx response. This next bit of code
2858 does the classification. */
2859
2860 else
2861 {
2862 BOOL message_error;
2863
2864 switch(save_errno)
2865 {
2866 #ifdef SUPPORT_I18N
2867 case ERRNO_UTF8_FWD:
2868 code = '5';
2869 /*FALLTHROUGH*/
2870 #endif
2871 case 0:
2872 case ERRNO_MAIL4XX:
2873 case ERRNO_DATA4XX:
2874 message_error = TRUE;
2875 break;
2876
2877 case ETIMEDOUT:
2878 message_error = Ustrncmp(smtp_command,"MAIL",4) == 0 ||
2879 Ustrncmp(smtp_command,"end ",4) == 0;
2880 break;
2881
2882 case ERRNO_SMTPCLOSED:
2883 message_error = Ustrncmp(smtp_command,"end ",4) == 0;
2884 break;
2885
2886 default:
2887 message_error = FALSE;
2888 break;
2889 }
2890
2891 /* Handle the cases that are treated as message errors. These are:
2892
2893 (a) negative response or timeout after MAIL
2894 (b) negative response after DATA
2895 (c) negative response or timeout or dropped connection after "."
2896 (d) utf8 support required and not offered
2897
2898 It won't be a negative response or timeout after RCPT, as that is dealt
2899 with separately above. The action in all cases is to set an appropriate
2900 error code for all the addresses, but to leave yield set to OK because the
2901 host itself has not failed. Of course, it might in practice have failed
2902 when we've had a timeout, but if so, we'll discover that at the next
2903 delivery attempt. For a temporary error, set the message_defer flag, and
2904 write to the logs for information if this is not the last host. The error
2905 for the last host will be logged as part of the address's log line. */
2906
2907 if (message_error)
2908 {
2909 if (mua_wrapper) code = '5'; /* Force hard failure in wrapper mode */
2910
2911 /* If there's an errno, the message contains just the identity of
2912 the host. */
2913
2914 if (code == '5')
2915 set_rc = FAIL;
2916 else /* Anything other than 5 is treated as temporary */
2917 {
2918 set_rc = DEFER;
2919 if (save_errno > 0)
2920 message = US string_sprintf("%s: %s", message, strerror(save_errno));
2921 if (host->next != NULL) log_write(0, LOG_MAIN, "%s", message);
2922 msglog_line(host, message);
2923 *message_defer = TRUE;
2924 }
2925 }
2926
2927 /* Otherwise, we have an I/O error or a timeout other than after MAIL or
2928 ".", or some other transportation error. We defer all addresses and yield
2929 DEFER, except for the case of failed add_headers expansion, or a transport
2930 filter failure, when the yield should be ERROR, to stop it trying other
2931 hosts. */
2932
2933 else
2934 {
2935 set_rc = DEFER;
2936 yield = (save_errno == ERRNO_CHHEADER_FAIL ||
2937 save_errno == ERRNO_FILTER_FAIL)? ERROR : DEFER;
2938 }
2939 }
2940
2941 set_errno(addrlist, save_errno, set_message, set_rc, pass_message, host
2942 #ifdef EXPERIMENTAL_DSN_INFO
2943 , smtp_greeting, helo_response
2944 #endif
2945 );
2946 }
2947
2948
2949 /* If all has gone well, send_quit will be set TRUE, implying we can end the
2950 SMTP session tidily. However, if there were too many addresses to send in one
2951 message (indicated by first_addr being non-NULL) we want to carry on with the
2952 rest of them. Also, it is desirable to send more than one message down the SMTP
2953 connection if there are several waiting, provided we haven't already sent so
2954 many as to hit the configured limit. The function transport_check_waiting looks
2955 for a waiting message and returns its id. Then transport_pass_socket tries to
2956 set up a continued delivery by passing the socket on to another process. The
2957 variable send_rset is FALSE if a message has just been successfully transfered.
2958
2959 If we are already sending down a continued channel, there may be further
2960 addresses not yet delivered that are aimed at the same host, but which have not
2961 been passed in this run of the transport. In this case, continue_more will be
2962 true, and all we should do is send RSET if necessary, and return, leaving the
2963 channel open.
2964
2965 However, if no address was disposed of, i.e. all addresses got 4xx errors, we
2966 do not want to continue with other messages down the same channel, because that
2967 can lead to looping between two or more messages, all with the same,
2968 temporarily failing address(es). [The retry information isn't updated yet, so
2969 new processes keep on trying.] We probably also don't want to try more of this
2970 message's addresses either.
2971
2972 If we have started a TLS session, we have to end it before passing the
2973 connection to a new process. However, not all servers can handle this (Exim
2974 can), so we do not pass such a connection on if the host matches
2975 hosts_nopass_tls. */
2976
2977 DEBUG(D_transport)
2978 debug_printf("ok=%d send_quit=%d send_rset=%d continue_more=%d "
2979 "yield=%d first_address is %sNULL\n", ok, send_quit, send_rset,
2980 continue_more, yield, (first_addr == NULL)? "":"not ");
2981
2982 if (completed_address && ok && send_quit)
2983 {
2984 BOOL more;
2985 smtp_compare_t t_compare;
2986
2987 t_compare.tblock = tblock;
2988 t_compare.current_sender_address = sender_address;
2989
2990 if ( first_addr != NULL
2991 || continue_more
2992 || ( ( tls_out.active < 0
2993 || verify_check_given_host(&ob->hosts_nopass_tls, host) != OK
2994 )
2995 &&
2996 transport_check_waiting(tblock->name, host->name,
2997 tblock->connection_max_messages, new_message_id, &more,
2998 (oicf)smtp_are_same_identities, (void*)&t_compare)
2999 ) )
3000 {
3001 uschar *msg;
3002 BOOL pass_message;
3003
3004 if (send_rset)
3005 {
3006 if (! (ok = smtp_write_command(&outblock, FALSE, "RSET\r\n") >= 0))
3007 {
3008 msg = US string_sprintf("send() to %s [%s] failed: %s", host->name,
3009 host->address, strerror(save_errno));
3010 send_quit = FALSE;
3011 }
3012 else if (! (ok = smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
3013 ob->command_timeout)))
3014 {
3015 int code;
3016 send_quit = check_response(host, &errno, 0, buffer, &code, &msg,
3017 &pass_message);
3018 if (!send_quit)
3019 {
3020 DEBUG(D_transport) debug_printf("H=%s [%s] %s\n",
3021 host->name, host->address, msg);
3022 }
3023 }
3024 }
3025
3026 /* Either RSET was not needed, or it succeeded */
3027
3028 if (ok)
3029 {
3030 if (first_addr != NULL) /* More addresses still to be sent */
3031 { /* in this run of the transport */
3032 continue_sequence++; /* Causes * in logging */
3033 goto SEND_MESSAGE;
3034 }
3035 if (continue_more) return yield; /* More addresses for another run */
3036
3037 /* Pass the socket to a new Exim process. Before doing so, we must shut
3038 down TLS. Not all MTAs allow for the continuation of the SMTP session
3039 when TLS is shut down. We test for this by sending a new EHLO. If we
3040 don't get a good response, we don't attempt to pass the socket on. */
3041
3042 #ifdef SUPPORT_TLS
3043 if (tls_out.active >= 0)
3044 {
3045 tls_close(FALSE, TRUE);
3046 smtp_peer_options = smtp_peer_options_wrap;
3047 if (smtps)
3048 ok = FALSE;
3049 else
3050 ok = smtp_write_command(&outblock,FALSE,"EHLO %s\r\n",helo_data) >= 0 &&
3051 smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
3052 ob->command_timeout);
3053 }
3054 #endif
3055
3056 /* If the socket is successfully passed, we musn't send QUIT (or
3057 indeed anything!) from here. */
3058
3059 /*XXX DSN_INFO: assume likely to do new HELO; but for greet we'll want to
3060 propagate it from the initial
3061 */
3062 if (ok && transport_pass_socket(tblock->name, host->name, host->address,
3063 new_message_id, inblock.sock))
3064 {
3065 send_quit = FALSE;
3066 }
3067 }
3068
3069 /* If RSET failed and there are addresses left, they get deferred. */
3070
3071 else set_errno(first_addr, errno, msg, DEFER, FALSE, host
3072 #ifdef EXPERIMENTAL_DSN_INFO
3073 , smtp_greeting, helo_response
3074 #endif
3075 );
3076 }
3077 }
3078
3079 /* End off tidily with QUIT unless the connection has died or the socket has
3080 been passed to another process. There has been discussion on the net about what
3081 to do after sending QUIT. The wording of the RFC suggests that it is necessary
3082 to wait for a response, but on the other hand, there isn't anything one can do
3083 with an error response, other than log it. Exim used to do that. However,
3084 further discussion suggested that it is positively advantageous not to wait for
3085 the response, but to close the session immediately. This is supposed to move
3086 the TCP/IP TIME_WAIT state from the server to the client, thereby removing some
3087 load from the server. (Hosts that are both servers and clients may not see much
3088 difference, of course.) Further discussion indicated that this was safe to do
3089 on Unix systems which have decent implementations of TCP/IP that leave the
3090 connection around for a while (TIME_WAIT) after the application has gone away.
3091 This enables the response sent by the server to be properly ACKed rather than
3092 timed out, as can happen on broken TCP/IP implementations on other OS.
3093
3094 This change is being made on 31-Jul-98. After over a year of trouble-free
3095 operation, the old commented-out code was removed on 17-Sep-99. */
3096
3097 SEND_QUIT:
3098 if (send_quit) (void)smtp_write_command(&outblock, FALSE, "QUIT\r\n");
3099
3100 END_OFF:
3101
3102 #ifdef SUPPORT_TLS
3103 tls_close(FALSE, TRUE);
3104 #endif
3105
3106 /* Close the socket, and return the appropriate value, first setting
3107 works because the NULL setting is passed back to the calling process, and
3108 remote_max_parallel is forced to 1 when delivering over an existing connection,
3109
3110 If all went well and continue_more is set, we shouldn't actually get here if
3111 there are further addresses, as the return above will be taken. However,
3112 writing RSET might have failed, or there may be other addresses whose hosts are
3113 specified in the transports, and therefore not visible at top level, in which
3114 case continue_more won't get set. */
3115
3116 HDEBUG(D_transport|D_acl|D_v) debug_printf(" SMTP(close)>>\n");
3117 (void)close(inblock.sock);
3118
3119 #ifndef DISABLE_EVENT
3120 (void) event_raise(tblock->event_action, US"tcp:close", NULL);
3121 #endif
3122
3123 continue_transport = NULL;
3124 continue_hostname = NULL;
3125 return yield;
3126 }
3127
3128
3129
3130
3131 /*************************************************
3132 * Closedown entry point *
3133 *************************************************/
3134
3135 /* This function is called when exim is passed an open smtp channel
3136 from another incarnation, but the message which it has been asked
3137 to deliver no longer exists. The channel is on stdin.
3138
3139 We might do fancy things like looking for another message to send down
3140 the channel, but if the one we sought has gone, it has probably been
3141 delivered by some other process that itself will seek further messages,
3142 so just close down our connection.
3143
3144 Argument: pointer to the transport instance block
3145 Returns: nothing
3146 */
3147
3148 void
3149 smtp_transport_closedown(transport_instance *tblock)
3150 {
3151 smtp_transport_options_block *ob =
3152 (smtp_transport_options_block *)(tblock->options_block);
3153 smtp_inblock inblock;
3154 smtp_outblock outblock;
3155 uschar buffer[256];
3156 uschar inbuffer[4096];
3157 uschar outbuffer[16];
3158
3159 inblock.sock = fileno(stdin);
3160 inblock.buffer = inbuffer;
3161 inblock.buffersize = sizeof(inbuffer);
3162 inblock.ptr = inbuffer;
3163 inblock.ptrend = inbuffer;
3164
3165 outblock.sock = inblock.sock;
3166 outblock.buffersize = sizeof(outbuffer);
3167 outblock.buffer = outbuffer;
3168 outblock.ptr = outbuffer;
3169 outblock.cmd_count = 0;
3170 outblock.authenticating = FALSE;
3171
3172 (void)smtp_write_command(&outblock, FALSE, "QUIT\r\n");
3173 (void)smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
3174 ob->command_timeout);
3175 (void)close(inblock.sock);
3176 }
3177
3178
3179
3180 /*************************************************
3181 * Prepare addresses for delivery *
3182 *************************************************/
3183
3184 /* This function is called to flush out error settings from previous delivery
3185 attempts to other hosts. It also records whether we got here via an MX record
3186 or not in the more_errno field of the address. We are interested only in
3187 addresses that are still marked DEFER - others may have got delivered to a
3188 previously considered IP address. Set their status to PENDING_DEFER to indicate
3189 which ones are relevant this time.
3190
3191 Arguments:
3192 addrlist the list of addresses
3193 host the host we are delivering to
3194
3195 Returns: the first address for this delivery
3196 */
3197
3198 static address_item *
3199 prepare_addresses(address_item *addrlist, host_item *host)
3200 {
3201 address_item *first_addr = NULL;
3202 address_item *addr;
3203 for (addr = addrlist; addr != NULL; addr = addr->next)
3204 if (addr->transport_return == DEFER)
3205 {
3206 if (first_addr == NULL) first_addr = addr;
3207 addr->transport_return = PENDING_DEFER;
3208 addr->basic_errno = 0;
3209 addr->more_errno = (host->mx >= 0)? 'M' : 'A';
3210 addr->message = NULL;
3211 #ifdef SUPPORT_TLS
3212 addr->cipher = NULL;
3213 addr->ourcert = NULL;
3214 addr->peercert = NULL;
3215 addr->peerdn = NULL;
3216 addr->ocsp = OCSP_NOT_REQ;
3217 #endif
3218 #ifdef EXPERIMENTAL_DSN_INFO
3219 addr->smtp_greeting = NULL;
3220 addr->helo_response = NULL;
3221 #endif
3222 }
3223 return first_addr;
3224 }
3225
3226
3227
3228 /*************************************************
3229 * Main entry point *
3230 *************************************************/
3231
3232 /* See local README for interface details. As this is a remote transport, it is
3233 given a chain of addresses to be delivered in one connection, if possible. It
3234 always returns TRUE, indicating that each address has its own independent
3235 status set, except if there is a setting up problem, in which case it returns
3236 FALSE. */
3237
3238 BOOL
3239 smtp_transport_entry(
3240 transport_instance *tblock, /* data for this instantiation */
3241 address_item *addrlist) /* addresses we are working on */
3242 {
3243 int cutoff_retry;
3244 int port;
3245 int hosts_defer = 0;
3246 int hosts_fail = 0;
3247 int hosts_looked_up = 0;
3248 int hosts_retry = 0;
3249 int hosts_serial = 0;
3250 int hosts_total = 0;
3251 int total_hosts_tried = 0;
3252 address_item *addr;
3253 BOOL expired = TRUE;
3254 BOOL continuing = continue_hostname != NULL;
3255 uschar *expanded_hosts = NULL;
3256 uschar *pistring;
3257 uschar *tid = string_sprintf("%s transport", tblock->name);
3258 smtp_transport_options_block *ob =
3259 (smtp_transport_options_block *)(tblock->options_block);
3260 host_item *hostlist = addrlist->host_list;
3261 host_item *host = NULL;
3262
3263 DEBUG(D_transport)
3264 {
3265 debug_printf("%s transport entered\n", tblock->name);
3266 for (addr = addrlist; addr != NULL; addr = addr->next)
3267 debug_printf(" %s\n", addr->address);
3268 if (continuing) debug_printf("already connected to %s [%s]\n",
3269 continue_hostname, continue_host_address);
3270 }
3271
3272 /* Set the flag requesting that these hosts be added to the waiting
3273 database if the delivery fails temporarily or if we are running with
3274 queue_smtp or a 2-stage queue run. This gets unset for certain
3275 kinds of error, typically those that are specific to the message. */
3276
3277 update_waiting = TRUE;
3278
3279 /* If a host list is not defined for the addresses - they must all have the
3280 same one in order to be passed to a single transport - or if the transport has
3281 a host list with hosts_override set, use the host list supplied with the
3282 transport. It is an error for this not to exist. */
3283
3284 if (hostlist == NULL || (ob->hosts_override && ob->hosts != NULL))
3285 {
3286 if (ob->hosts == NULL)
3287 {
3288 addrlist->message = string_sprintf("%s transport called with no hosts set",
3289 tblock->name);
3290 addrlist->transport_return = PANIC;
3291 return FALSE; /* Only top address has status */
3292 }
3293
3294 DEBUG(D_transport) debug_printf("using the transport's hosts: %s\n",
3295 ob->hosts);
3296
3297 /* If the transport's host list contains no '$' characters, and we are not
3298 randomizing, it is fixed and therefore a chain of hosts can be built once
3299 and for all, and remembered for subsequent use by other calls to this
3300 transport. If, on the other hand, the host list does contain '$', or we are
3301 randomizing its order, we have to rebuild it each time. In the fixed case,
3302 as the hosts string will never be used again, it doesn't matter that we
3303 replace all the : characters with zeros. */
3304
3305 if (ob->hostlist == NULL)
3306 {
3307 uschar *s = ob->hosts;
3308
3309 if (Ustrchr(s, '$') != NULL)
3310 {
3311 if (!(expanded_hosts = expand_string(s)))
3312 {
3313 addrlist->message = string_sprintf("failed to expand list of hosts "
3314 "\"%s\" in %s transport: %s", s, tblock->name, expand_string_message);
3315 addrlist->transport_return = search_find_defer? DEFER : PANIC;
3316 return FALSE; /* Only top address has status */
3317 }
3318 DEBUG(D_transport) debug_printf("expanded list of hosts \"%s\" to "
3319 "\"%s\"\n", s, expanded_hosts);
3320 s = expanded_hosts;
3321 }
3322 else
3323 if (ob->hosts_randomize) s = expanded_hosts = string_copy(s);
3324
3325 host_build_hostlist(&hostlist, s, ob->hosts_randomize);
3326
3327 /* Check that the expansion yielded something useful. */
3328 if (hostlist == NULL)
3329 {
3330 addrlist->message =
3331 string_sprintf("%s transport has empty hosts setting", tblock->name);
3332 addrlist->transport_return = PANIC;
3333 return FALSE; /* Only top address has status */
3334 }
3335
3336 /* If there was no expansion of hosts, save the host list for
3337 next time. */
3338
3339 if (!expanded_hosts) ob->hostlist = hostlist;
3340 }
3341
3342 /* This is not the first time this transport has been run in this delivery;
3343 the host list was built previously. */
3344
3345 else
3346 hostlist = ob->hostlist;
3347 }
3348
3349 /* The host list was supplied with the address. If hosts_randomize is set, we
3350 must sort it into a random order if it did not come from MX records and has not
3351 already been randomized (but don't bother if continuing down an existing
3352 connection). */
3353
3354 else if (ob->hosts_randomize && hostlist->mx == MX_NONE && !continuing)
3355 {
3356 host_item *newlist = NULL;
3357 while (hostlist != NULL)
3358 {
3359 host_item *h = hostlist;
3360 hostlist = hostlist->next;
3361
3362 h->sort_key = random_number(100);
3363
3364 if (newlist == NULL)
3365 {
3366 h->next = NULL;
3367 newlist = h;
3368 }
3369 else if (h->sort_key < newlist->sort_key)
3370 {
3371 h->next = newlist;
3372 newlist = h;
3373 }
3374 else
3375 {
3376 host_item *hh = newlist;
3377 while (hh->next != NULL)
3378 {
3379 if (h->sort_key < hh->next->sort_key) break;
3380 hh = hh->next;
3381 }
3382 h->next = hh->next;
3383 hh->next = h;
3384 }
3385 }
3386
3387 hostlist = addrlist->host_list = newlist;
3388 }
3389
3390 /* Sort out the default port. */
3391
3392 if (!smtp_get_port(ob->port, addrlist, &port, tid)) return FALSE;
3393
3394 /* For each host-plus-IP-address on the list:
3395
3396 . If this is a continued delivery and the host isn't the one with the
3397 current connection, skip.
3398
3399 . If the status is unusable (i.e. previously failed or retry checked), skip.
3400
3401 . If no IP address set, get the address, either by turning the name into
3402 an address, calling gethostbyname if gethostbyname is on, or by calling
3403 the DNS. The DNS may yield multiple addresses, in which case insert the
3404 extra ones into the list.
3405
3406 . Get the retry data if not previously obtained for this address and set the
3407 field which remembers the state of this address. Skip if the retry time is
3408 not reached. If not, remember whether retry data was found. The retry string
3409 contains both the name and the IP address.
3410
3411 . Scan the list of addresses and mark those whose status is DEFER as
3412 PENDING_DEFER. These are the only ones that will be processed in this cycle
3413 of the hosts loop.
3414
3415 . Make a delivery attempt - addresses marked PENDING_DEFER will be tried.
3416 Some addresses may be successfully delivered, others may fail, and yet
3417 others may get temporary errors and so get marked DEFER.
3418
3419 . The return from the delivery attempt is OK if a connection was made and a
3420 valid SMTP dialogue was completed. Otherwise it is DEFER.
3421
3422 . If OK, add a "remove" retry item for this host/IPaddress, if any.
3423
3424 . If fail to connect, or other defer state, add a retry item.
3425
3426 . If there are any addresses whose status is still DEFER, carry on to the
3427 next host/IPaddress, unless we have tried the number of hosts given
3428 by hosts_max_try or hosts_max_try_hardlimit; otherwise return. Note that
3429 there is some fancy logic for hosts_max_try that means its limit can be
3430 overstepped in some circumstances.
3431
3432 If we get to the end of the list, all hosts have deferred at least one address,
3433 or not reached their retry times. If delay_after_cutoff is unset, it requests a
3434 delivery attempt to those hosts whose last try was before the arrival time of
3435 the current message. To cope with this, we have to go round the loop a second
3436 time. After that, set the status and error data for any addresses that haven't
3437 had it set already. */
3438
3439 for (cutoff_retry = 0; expired &&
3440 cutoff_retry < ((ob->delay_after_cutoff)? 1 : 2);
3441 cutoff_retry++)
3442 {
3443 host_item *nexthost = NULL;
3444 int unexpired_hosts_tried = 0;
3445
3446 for (host = hostlist;
3447 host != NULL &&
3448 unexpired_hosts_tried < ob->hosts_max_try &&
3449 total_hosts_tried < ob->hosts_max_try_hardlimit;
3450 host = nexthost)
3451 {
3452 int rc;
3453 int host_af;
3454 uschar *rs;
3455 BOOL serialized = FALSE;
3456 BOOL host_is_expired = FALSE;
3457 BOOL message_defer = FALSE;
3458 BOOL some_deferred = FALSE;
3459 address_item *first_addr = NULL;
3460 uschar *interface = NULL;
3461 uschar *retry_host_key = NULL;
3462 uschar *retry_message_key = NULL;
3463 uschar *serialize_key = NULL;
3464
3465 /* Default next host is next host. :-) But this can vary if the
3466 hosts_max_try limit is hit (see below). It may also be reset if a host
3467 address is looked up here (in case the host was multihomed). */
3468
3469 nexthost = host->next;
3470
3471 /* If the address hasn't yet been obtained from the host name, look it up
3472 now, unless the host is already marked as unusable. If it is marked as
3473 unusable, it means that the router was unable to find its IP address (in
3474 the DNS or wherever) OR we are in the 2nd time round the cutoff loop, and
3475 the lookup failed last time. We don't get this far if *all* MX records
3476 point to non-existent hosts; that is treated as a hard error.
3477
3478 We can just skip this host entirely. When the hosts came from the router,
3479 the address will timeout based on the other host(s); when the address is
3480 looked up below, there is an explicit retry record added.
3481
3482 Note that we mustn't skip unusable hosts if the address is not unset; they
3483 may be needed as expired hosts on the 2nd time round the cutoff loop. */
3484
3485 if (host->address == NULL)
3486 {
3487 int new_port, flags;
3488 host_item *hh;
3489
3490 if (host->status >= hstatus_unusable)
3491 {
3492 DEBUG(D_transport) debug_printf("%s has no address and is unusable - skipping\n",
3493 host->name);
3494 continue;
3495 }
3496
3497 DEBUG(D_transport) debug_printf("getting address for %s\n", host->name);
3498
3499 /* The host name is permitted to have an attached port. Find it, and
3500 strip it from the name. Just remember it for now. */
3501
3502 new_port = host_item_get_port(host);
3503
3504 /* Count hosts looked up */
3505
3506 hosts_looked_up++;
3507
3508 /* Find by name if so configured, or if it's an IP address. We don't
3509 just copy the IP address, because we need the test-for-local to happen. */
3510
3511 flags = HOST_FIND_BY_A;
3512 if (ob->dns_qualify_single) flags |= HOST_FIND_QUALIFY_SINGLE;
3513 if (ob->dns_search_parents) flags |= HOST_FIND_SEARCH_PARENTS;
3514
3515 if (ob->gethostbyname || string_is_ip_address(host->name, NULL) != 0)
3516 rc = host_find_byname(host, NULL, flags, NULL, TRUE);
3517 else
3518 rc = host_find_bydns(host, NULL, flags, NULL, NULL, NULL,
3519 &ob->dnssec, /* domains for request/require */
3520 NULL, NULL);
3521
3522 /* Update the host (and any additional blocks, resulting from
3523 multihoming) with a host-specific port, if any. */
3524
3525 for (hh = host; hh != nexthost; hh = hh->next) hh->port = new_port;
3526
3527 /* Failure to find the host at this time (usually DNS temporary failure)
3528 is really a kind of routing failure rather than a transport failure.
3529 Therefore we add a retry item of the routing kind, not to stop us trying
3530 to look this name up here again, but to ensure the address gets timed
3531 out if the failures go on long enough. A complete failure at this point
3532 commonly points to a configuration error, but the best action is still
3533 to carry on for the next host. */
3534
3535 if (rc == HOST_FIND_AGAIN || rc == HOST_FIND_FAILED)
3536 {
3537 retry_add_item(addrlist, string_sprintf("R:%s", host->name), 0);
3538 expired = FALSE;
3539 if (rc == HOST_FIND_AGAIN) hosts_defer++; else hosts_fail++;
3540 DEBUG(D_transport) debug_printf("rc = %s for %s\n", (rc == HOST_FIND_AGAIN)?
3541 "HOST_FIND_AGAIN" : "HOST_FIND_FAILED", host->name);
3542 host->status = hstatus_unusable;
3543
3544 for (addr = addrlist; addr != NULL; addr = addr->next)
3545 {
3546 if (addr->transport_return != DEFER) continue;
3547 addr->basic_errno = ERRNO_UNKNOWNHOST;
3548 addr->message =
3549 string_sprintf("failed to lookup IP address for %s", host->name);
3550 }
3551 continue;
3552 }
3553
3554 /* If the host is actually the local host, we may have a problem, or
3555 there may be some cunning configuration going on. In the problem case,
3556 log things and give up. The default transport status is already DEFER. */
3557
3558 if (rc == HOST_FOUND_LOCAL && !ob->allow_localhost)
3559 {
3560 for (addr = addrlist; addr != NULL; addr = addr->next)
3561 {
3562 addr->basic_errno = 0;
3563 addr->message = string_sprintf("%s transport found host %s to be "
3564 "local", tblock->name, host->name);
3565 }
3566 goto END_TRANSPORT;
3567 }
3568 } /* End of block for IP address lookup */
3569
3570 /* If this is a continued delivery, we are interested only in the host
3571 which matches the name of the existing open channel. The check is put
3572 here after the local host lookup, in case the name gets expanded as a
3573 result of the lookup. Set expired FALSE, to save the outer loop executing
3574 twice. */
3575
3576 if (continuing && (Ustrcmp(continue_hostname, host->name) != 0 ||
3577 Ustrcmp(continue_host_address, host->address) != 0))
3578 {
3579 expired = FALSE;
3580 continue; /* With next host */
3581 }
3582
3583 /* Reset the default next host in case a multihomed host whose addresses
3584 are not looked up till just above added to the host list. */
3585
3586 nexthost = host->next;
3587
3588 /* If queue_smtp is set (-odqs or the first part of a 2-stage run), or the
3589 domain is in queue_smtp_domains, we don't actually want to attempt any
3590 deliveries. When doing a queue run, queue_smtp_domains is always unset. If
3591 there is a lookup defer in queue_smtp_domains, proceed as if the domain
3592 were not in it. We don't want to hold up all SMTP deliveries! Except when
3593 doing a two-stage queue run, don't do this if forcing. */
3594
3595 if ((!deliver_force || queue_2stage) && (queue_smtp ||
3596 match_isinlist(addrlist->domain,
3597 (const uschar **)&queue_smtp_domains, 0,
3598 &domainlist_anchor, NULL, MCL_DOMAIN, TRUE, NULL) == OK))
3599 {
3600 expired = FALSE;
3601 for (addr = addrlist; addr != NULL; addr = addr->next)
3602 {
3603 if (addr->transport_return != DEFER) continue;
3604 addr->message = US"domain matches queue_smtp_domains, or -odqs set";
3605 }
3606 continue; /* With next host */
3607 }
3608
3609 /* Count hosts being considered - purely for an intelligent comment
3610 if none are usable. */
3611
3612 hosts_total++;
3613
3614 /* Set $host and $host address now in case they are needed for the
3615 interface expansion or the serialize_hosts check; they remain set if an
3616 actual delivery happens. */
3617
3618 deliver_host = host->name;
3619 deliver_host_address = host->address;
3620 lookup_dnssec_authenticated = host->dnssec == DS_YES ? US"yes"
3621 : host->dnssec == DS_NO ? US"no"
3622 : US"";
3623
3624 /* Set up a string for adding to the retry key if the port number is not
3625 the standard SMTP port. A host may have its own port setting that overrides
3626 the default. */
3627
3628 pistring = string_sprintf(":%d", (host->port == PORT_NONE)?
3629 port : host->port);
3630 if (Ustrcmp(pistring, ":25") == 0) pistring = US"";
3631
3632 /* Select IPv4 or IPv6, and choose an outgoing interface. If the interface
3633 string is set, even if constant (as different transports can have different
3634 constant settings), we must add it to the key that is used for retries,
3635 because connections to the same host from a different interface should be
3636 treated separately. */
3637
3638 host_af = (Ustrchr(host->address, ':') == NULL)? AF_INET : AF_INET6;
3639 if ((rs = ob->interface) && *rs)
3640 {
3641 if (!smtp_get_interface(rs, host_af, addrlist, &interface, tid))
3642 return FALSE;
3643 pistring = string_sprintf("%s/%s", pistring, interface);
3644 }
3645
3646 /* The first time round the outer loop, check the status of the host by
3647 inspecting the retry data. The second time round, we are interested only
3648 in expired hosts that haven't been tried since this message arrived. */
3649
3650 if (cutoff_retry == 0)
3651 {
3652 BOOL incl_ip;
3653 /* Ensure the status of the address is set by checking retry data if
3654 necessary. There may be host-specific retry data (applicable to all
3655 messages) and also data for retries of a specific message at this host.
3656 If either of these retry records are actually read, the keys used are
3657 returned to save recomputing them later. */
3658
3659 if (exp_bool(addrlist, US"transport", tblock->name, D_transport,
3660 US"retry_include_ip_address", ob->retry_include_ip_address,
3661 ob->expand_retry_include_ip_address, &incl_ip) != OK)
3662 continue; /* with next host */
3663
3664 host_is_expired = retry_check_address(addrlist->domain, host, pistring,
3665 incl_ip, &retry_host_key, &retry_message_key);
3666
3667 DEBUG(D_transport) debug_printf("%s [%s]%s status = %s\n", host->name,
3668 (host->address == NULL)? US"" : host->address, pistring,
3669 (host->status == hstatus_usable)? "usable" :
3670 (host->status == hstatus_unusable)? "unusable" :
3671 (host->status == hstatus_unusable_expired)? "unusable (expired)" : "?");
3672
3673 /* Skip this address if not usable at this time, noting if it wasn't
3674 actually expired, both locally and in the address. */
3675
3676 switch (host->status)
3677 {
3678 case hstatus_unusable:
3679 expired = FALSE;
3680 setflag(addrlist, af_retry_skipped);
3681 /* Fall through */
3682
3683 case hstatus_unusable_expired:
3684 switch (host->why)
3685 {
3686 case hwhy_retry: hosts_retry++; break;
3687 case hwhy_failed: hosts_fail++; break;
3688 case hwhy_deferred: hosts_defer++; break;
3689 }
3690
3691 /* If there was a retry message key, implying that previously there
3692 was a message-specific defer, we don't want to update the list of
3693 messages waiting for these hosts. */
3694
3695 if (retry_message_key != NULL) update_waiting = FALSE;
3696 continue; /* With the next host or IP address */
3697 }
3698 }
3699
3700 /* Second time round the loop: if the address is set but expired, and
3701 the message is newer than the last try, let it through. */
3702
3703 else
3704 {
3705 if (host->address == NULL ||
3706 host->status != hstatus_unusable_expired ||
3707 host->last_try > received_time)
3708 continue;
3709 DEBUG(D_transport)
3710 debug_printf("trying expired host %s [%s]%s\n",
3711 host->name, host->address, pistring);
3712 host_is_expired = TRUE;
3713 }
3714
3715 /* Setting "expired=FALSE" doesn't actually mean not all hosts are expired;
3716 it remains TRUE only if all hosts are expired and none are actually tried.
3717 */
3718
3719 expired = FALSE;
3720
3721 /* If this host is listed as one to which access must be serialized,
3722 see if another Exim process has a connection to it, and if so, skip
3723 this host. If not, update the database to record our connection to it
3724 and remember this for later deletion. Do not do any of this if we are
3725 sending the message down a pre-existing connection. */
3726
3727 if (!continuing &&
3728 verify_check_given_host(&ob->serialize_hosts, host) == OK)
3729 {
3730 serialize_key = string_sprintf("host-serialize-%s", host->name);
3731 if (!enq_start(serialize_key, 1))
3732 {
3733 DEBUG(D_transport)
3734 debug_printf("skipping host %s because another Exim process "
3735 "is connected to it\n", host->name);
3736 hosts_serial++;
3737 continue;
3738 }
3739 serialized = TRUE;
3740 }
3741
3742 /* OK, we have an IP address that is not waiting for its retry time to
3743 arrive (it might be expired) OR (second time round the loop) we have an
3744 expired host that hasn't been tried since the message arrived. Have a go
3745 at delivering the message to it. First prepare the addresses by flushing
3746 out the result of previous attempts, and finding the first address that
3747 is still to be delivered. */
3748
3749 first_addr = prepare_addresses(addrlist, host);
3750
3751 DEBUG(D_transport) debug_printf("delivering %s to %s [%s] (%s%s)\n",
3752 message_id, host->name, host->address, addrlist->address,
3753 (addrlist->next == NULL)? "" : ", ...");
3754
3755 set_process_info("delivering %s to %s [%s] (%s%s)",
3756 message_id, host->name, host->address, addrlist->address,
3757 (addrlist->next == NULL)? "" : ", ...");
3758
3759 /* This is not for real; don't do the delivery. If there are
3760 any remaining hosts, list them. */
3761
3762 if (dont_deliver)
3763 {
3764 host_item *host2;
3765 set_errno_nohost(addrlist, 0, NULL, OK, FALSE);
3766 for (addr = addrlist; addr != NULL; addr = addr->next)
3767 {
3768 addr->host_used = host;
3769 addr->special_action = '*';
3770 addr->message = US"delivery bypassed by -N option";
3771 }
3772 DEBUG(D_transport)
3773 {
3774 debug_printf("*** delivery by %s transport bypassed by -N option\n"
3775 "*** host and remaining hosts:\n", tblock->name);
3776 for (host2 = host; host2 != NULL; host2 = host2->next)
3777 debug_printf(" %s [%s]\n", host2->name,
3778 (host2->address == NULL)? US"unset" : host2->address);
3779 }
3780 rc = OK;
3781 }
3782
3783 /* This is for real. If the host is expired, we don't count it for
3784 hosts_max_retry. This ensures that all hosts must expire before an address
3785 is timed out, unless hosts_max_try_hardlimit (which protects against
3786 lunatic DNS configurations) is reached.
3787
3788 If the host is not expired and we are about to hit the hosts_max_retry
3789 limit, check to see if there is a subsequent hosts with a different MX
3790 value. If so, make that the next host, and don't count this one. This is a
3791 heuristic to make sure that different MXs do get tried. With a normal kind
3792 of retry rule, they would get tried anyway when the earlier hosts were
3793 delayed, but if the domain has a "retry every time" type of rule - as is
3794 often used for the the very large ISPs, that won't happen. */
3795
3796 else
3797 {
3798 host_item * thost;
3799 /* Make a copy of the host if it is local to this invocation
3800 of the transport. */
3801
3802 if (expanded_hosts)
3803 {
3804 thost = store_get(sizeof(host_item));
3805 *thost = *host;
3806 thost->name = string_copy(host->name);
3807 thost->address = string_copy(host->address);
3808 }
3809 else
3810 thost = host;
3811
3812 if (!host_is_expired && ++unexpired_hosts_tried >= ob->hosts_max_try)
3813 {
3814 host_item *h;
3815 DEBUG(D_transport)
3816 debug_printf("hosts_max_try limit reached with this host\n");
3817 for (h = host; h; h = h->next) if (h->mx != host->mx)
3818 {
3819 nexthost = h;
3820 unexpired_hosts_tried--;
3821 DEBUG(D_transport) debug_printf("however, a higher MX host exists "
3822 "and will be tried\n");
3823 break;
3824 }
3825 }
3826
3827 /* Attempt the delivery. */
3828
3829 total_hosts_tried++;
3830 rc = smtp_deliver(addrlist, thost, host_af, port, interface, tblock,
3831 &message_defer, FALSE);
3832
3833 /* Yield is one of:
3834 OK => connection made, each address contains its result;
3835 message_defer is set for message-specific defers (when all
3836 recipients are marked defer)
3837 DEFER => there was a non-message-specific delivery problem;
3838 ERROR => there was a problem setting up the arguments for a filter,
3839 or there was a problem with expanding added headers
3840 */
3841
3842 /* If the result is not OK, there was a non-message-specific problem.
3843 If the result is DEFER, we need to write to the logs saying what happened
3844 for this particular host, except in the case of authentication and TLS
3845 failures, where the log has already been written. If all hosts defer a
3846 general message is written at the end. */
3847
3848 if (rc == DEFER && first_addr->basic_errno != ERRNO_AUTHFAIL &&
3849 first_addr->basic_errno != ERRNO_TLSFAILURE)
3850 write_logs(first_addr, host);
3851
3852 #ifndef DISABLE_EVENT
3853 if (rc == DEFER)
3854 deferred_event_raise(first_addr, host);
3855 #endif
3856
3857 /* If STARTTLS was accepted, but there was a failure in setting up the
3858 TLS session (usually a certificate screwup), and the host is not in
3859 hosts_require_tls, and tls_tempfail_tryclear is true, try again, with
3860 TLS forcibly turned off. We have to start from scratch with a new SMTP
3861 connection. That's why the retry is done from here, not from within
3862 smtp_deliver(). [Rejections of STARTTLS itself don't screw up the
3863 session, so the in-clear transmission after those errors, if permitted,
3864 happens inside smtp_deliver().] */
3865
3866 #ifdef SUPPORT_TLS
3867 if ( rc == DEFER
3868 && first_addr->basic_errno == ERRNO_TLSFAILURE
3869 && ob->tls_tempfail_tryclear
3870 && verify_check_given_host(&ob->hosts_require_tls, host) != OK
3871 )
3872 {
3873 log_write(0, LOG_MAIN, "TLS session failure: delivering unencrypted "
3874 "to %s [%s] (not in hosts_require_tls)", host->name, host->address);
3875 first_addr = prepare_addresses(addrlist, host);
3876 rc = smtp_deliver(addrlist, thost, host_af, port, interface, tblock,
3877 &message_defer, TRUE);
3878 if (rc == DEFER && first_addr->basic_errno != ERRNO_AUTHFAIL)
3879 write_logs(first_addr, host);
3880 # ifndef DISABLE_EVENT
3881 if (rc == DEFER)
3882 deferred_event_raise(first_addr, host);
3883 # endif
3884 }
3885 #endif /*SUPPORT_TLS*/
3886 }
3887
3888 /* Delivery attempt finished */
3889
3890 rs = (rc == OK)? US"OK" : (rc == DEFER)? US"DEFER" : (rc == ERROR)?
3891 US"ERROR" : US"?";
3892
3893 set_process_info("delivering %s: just tried %s [%s] for %s%s: result %s",
3894 message_id, host->name, host->address, addrlist->address,
3895 (addrlist->next == NULL)? "" : " (& others)", rs);
3896
3897 /* Release serialization if set up */
3898
3899 if (serialized) enq_end(serialize_key);
3900
3901 /* If the result is DEFER, or if a host retry record is known to exist, we
3902 need to add an item to the retry chain for updating the retry database
3903 at the end of delivery. We only need to add the item to the top address,
3904 of course. Also, if DEFER, we mark the IP address unusable so as to skip it
3905 for any other delivery attempts using the same address. (It is copied into
3906 the unusable tree at the outer level, so even if different address blocks
3907 contain the same address, it still won't get tried again.) */
3908
3909 if (rc == DEFER || retry_host_key != NULL)
3910 {
3911 int delete_flag = (rc != DEFER)? rf_delete : 0;
3912 if (retry_host_key == NULL)
3913 {
3914 BOOL incl_ip;
3915 if (exp_bool(addrlist, US"transport", tblock->name, D_transport,
3916 US"retry_include_ip_address", ob->retry_include_ip_address,
3917 ob->expand_retry_include_ip_address, &incl_ip) != OK)
3918 incl_ip = TRUE; /* error; use most-specific retry record */
3919
3920 retry_host_key = incl_ip ?
3921 string_sprintf("T:%S:%s%s", host->name, host->address, pistring) :
3922 string_sprintf("T:%S%s", host->name, pistring);
3923 }
3924
3925 /* If a delivery of another message over an existing SMTP connection
3926 yields DEFER, we do NOT set up retry data for the host. This covers the
3927 case when there are delays in routing the addresses in the second message
3928 that are so long that the server times out. This is alleviated by not
3929 routing addresses that previously had routing defers when handling an
3930 existing connection, but even so, this case may occur (e.g. if a
3931 previously happily routed address starts giving routing defers). If the
3932 host is genuinely down, another non-continued message delivery will
3933 notice it soon enough. */
3934
3935 if (delete_flag != 0 || !continuing)
3936 retry_add_item(first_addr, retry_host_key, rf_host | delete_flag);
3937
3938 /* We may have tried an expired host, if its retry time has come; ensure
3939 the status reflects the expiry for the benefit of any other addresses. */
3940
3941 if (rc == DEFER)
3942 {
3943 host->status = (host_is_expired)?
3944 hstatus_unusable_expired : hstatus_unusable;
3945 host->why = hwhy_deferred;
3946 }
3947 }
3948
3949 /* If message_defer is set (host was OK, but every recipient got deferred
3950 because of some message-specific problem), or if that had happened
3951 previously so that a message retry key exists, add an appropriate item
3952 to the retry chain. Note that if there was a message defer but now there is
3953 a host defer, the message defer record gets deleted. That seems perfectly
3954 reasonable. Also, stop the message from being remembered as waiting
3955 for specific hosts. */
3956
3957 if (message_defer || retry_message_key != NULL)
3958 {
3959 int delete_flag = message_defer? 0 : rf_delete;
3960 if (retry_message_key == NULL)
3961 {
3962 BOOL incl_ip;
3963 if (exp_bool(addrlist, US"transport", tblock->name, D_transport,
3964 US"retry_include_ip_address", ob->retry_include_ip_address,
3965 ob->expand_retry_include_ip_address, &incl_ip) != OK)
3966 incl_ip = TRUE; /* error; use most-specific retry record */
3967
3968 retry_message_key = incl_ip ?
3969 string_sprintf("T:%S:%s%s:%s", host->name, host->address, pistring,
3970 message_id) :
3971 string_sprintf("T:%S%s:%s", host->name, pistring, message_id);
3972 }
3973 retry_add_item(addrlist, retry_message_key,
3974 rf_message | rf_host | delete_flag);
3975 update_waiting = FALSE;
3976 }
3977
3978 /* Any return other than DEFER (that is, OK or ERROR) means that the
3979 addresses have got their final statuses filled in for this host. In the OK
3980 case, see if any of them are deferred. */
3981
3982 if (rc == OK)
3983 for (addr = addrlist; addr; addr = addr->next)
3984 if (addr->transport_return == DEFER)
3985 {
3986 some_deferred = TRUE;
3987 break;
3988 }
3989
3990 /* If no addresses deferred or the result was ERROR, return. We do this for
3991 ERROR because a failing filter set-up or add_headers expansion is likely to
3992 fail for any host we try. */
3993
3994 if (rc == ERROR || (rc == OK && !some_deferred))
3995 {
3996 DEBUG(D_transport) debug_printf("Leaving %s transport\n", tblock->name);
3997 return TRUE; /* Each address has its status */
3998 }
3999
4000 /* If the result was DEFER or some individual addresses deferred, let
4001 the loop run to try other hosts with the deferred addresses, except for the
4002 case when we were trying to deliver down an existing channel and failed.
4003 Don't try any other hosts in this case. */
4004
4005 if (continuing) break;
4006
4007 /* If the whole delivery, or some individual addresses, were deferred and
4008 there are more hosts that could be tried, do not count this host towards
4009 the hosts_max_try limit if the age of the message is greater than the
4010 maximum retry time for this host. This means we may try try all hosts,
4011 ignoring the limit, when messages have been around for some time. This is
4012 important because if we don't try all hosts, the address will never time
4013 out. NOTE: this does not apply to hosts_max_try_hardlimit. */
4014
4015 if ((rc == DEFER || some_deferred) && nexthost != NULL)
4016 {
4017 BOOL timedout;
4018 retry_config *retry = retry_find_config(host->name, NULL, 0, 0);
4019
4020 if (retry != NULL && retry->rules != NULL)
4021 {
4022 retry_rule *last_rule;
4023 for (last_rule = retry->rules;
4024 last_rule->next != NULL;
4025 last_rule = last_rule->next);
4026 timedout = time(NULL) - received_time > last_rule->timeout;
4027 }
4028 else timedout = TRUE; /* No rule => timed out */
4029
4030 if (timedout)
4031 {
4032 unexpired_hosts_tried--;
4033 DEBUG(D_transport) debug_printf("temporary delivery error(s) override "
4034 "hosts_max_try (message older than host's retry time)\n");
4035 }
4036 }
4037 } /* End of loop for trying multiple hosts. */
4038
4039 /* This is the end of the loop that repeats iff expired is TRUE and
4040 ob->delay_after_cutoff is FALSE. The second time round we will
4041 try those hosts that haven't been tried since the message arrived. */
4042
4043 DEBUG(D_transport)
4044 {
4045 debug_printf("all IP addresses skipped or deferred at least one address\n");
4046 if (expired && !ob->delay_after_cutoff && cutoff_retry == 0)
4047 debug_printf("retrying IP addresses not tried since message arrived\n");
4048 }
4049 }
4050
4051
4052 /* Get here if all IP addresses are skipped or defer at least one address. In
4053 MUA wrapper mode, this will happen only for connection or other non-message-
4054 specific failures. Force the delivery status for all addresses to FAIL. */
4055
4056 if (mua_wrapper)
4057 {
4058 for (addr = addrlist; addr != NULL; addr = addr->next)
4059 addr->transport_return = FAIL;
4060 goto END_TRANSPORT;
4061 }
4062
4063 /* In the normal, non-wrapper case, add a standard message to each deferred
4064 address if there hasn't been an error, that is, if it hasn't actually been
4065 tried this time. The variable "expired" will be FALSE if any deliveries were
4066 actually tried, or if there was at least one host that was not expired. That
4067 is, it is TRUE only if no deliveries were tried and all hosts were expired. If
4068 a delivery has been tried, an error code will be set, and the failing of the
4069 message is handled by the retry code later.
4070
4071 If queue_smtp is set, or this transport was called to send a subsequent message
4072 down an existing TCP/IP connection, and something caused the host not to be
4073 found, we end up here, but can detect these cases and handle them specially. */
4074
4075 for (addr = addrlist; addr; addr = addr->next)
4076 {
4077 /* If host is not NULL, it means that we stopped processing the host list
4078 because of hosts_max_try or hosts_max_try_hardlimit. In the former case, this
4079 means we need to behave as if some hosts were skipped because their retry
4080 time had not come. Specifically, this prevents the address from timing out.
4081 However, if we have hit hosts_max_try_hardlimit, we want to behave as if all
4082 hosts were tried. */
4083
4084 if (host)
4085 if (total_hosts_tried >= ob->hosts_max_try_hardlimit)
4086 {
4087 DEBUG(D_transport)
4088 debug_printf("hosts_max_try_hardlimit reached: behave as if all "
4089 "hosts were tried\n");
4090 }
4091 else
4092 {
4093 DEBUG(D_transport)
4094 debug_printf("hosts_max_try limit caused some hosts to be skipped\n");
4095 setflag(addr, af_retry_skipped);
4096 }
4097
4098 if (queue_smtp) /* no deliveries attempted */
4099 {
4100 addr->transport_return = DEFER;
4101 addr->basic_errno = 0;
4102 addr->message = US"SMTP delivery explicitly queued";
4103 }
4104
4105 else if ( addr->transport_return == DEFER
4106 && (addr->basic_errno == ERRNO_UNKNOWNERROR || addr->basic_errno == 0)
4107 && !addr->message
4108 )
4109 {
4110 addr->basic_errno = ERRNO_HRETRY;
4111 if (continue_hostname)
4112 addr->message = US"no host found for existing SMTP connection";
4113 else if (expired)
4114 {
4115 setflag(addr, af_pass_message); /* This is not a security risk */
4116 addr->message = string_sprintf(
4117 "all hosts%s have been failing for a long time %s",
4118 addr->domain ? string_sprintf(" for '%s'", addr->domain) : US"",
4119 ob->delay_after_cutoff
4120 ? US"(and retry time not reached)"
4121 : US"and were last tried after this message arrived");
4122
4123 /* If we are already using fallback hosts, or there are no fallback hosts
4124 defined, convert the result to FAIL to cause a bounce. */
4125
4126 if (addr->host_list == addr->fallback_hosts || !addr->fallback_hosts)
4127 addr->transport_return = FAIL;
4128 }
4129 else
4130 {
4131 const char * s;
4132 if (hosts_retry == hosts_total)
4133 s = "retry time not reached for any host%s";
4134 else if (hosts_fail == hosts_total)
4135 s = "all host address lookups%s failed permanently";
4136 else if (hosts_defer == hosts_total)
4137 s = "all host address lookups%s failed temporarily";
4138 else if (hosts_serial == hosts_total)
4139 s = "connection limit reached for all hosts%s";
4140 else if (hosts_fail+hosts_defer == hosts_total)
4141 s = "all host address lookups%s failed";
4142 else
4143 s = "some host address lookups failed and retry time "
4144 "not reached for other hosts or connection limit reached%s";
4145
4146 addr->message = string_sprintf(s,
4147 addr->domain ? string_sprintf(" for '%s'", addr->domain) : US"");
4148 }
4149 }
4150 }
4151
4152 /* Update the database which keeps information about which messages are waiting
4153 for which hosts to become available. For some message-specific errors, the
4154 update_waiting flag is turned off because we don't want follow-on deliveries in
4155 those cases. If this transport instance is explicitly limited to one message
4156 per connection then follow-on deliveries are not possible and there's no need
4157 to create/update the per-transport wait-<transport_name> database. */
4158
4159 if (update_waiting && tblock->connection_max_messages != 1)
4160 transport_update_waiting(hostlist, tblock->name);
4161
4162 END_TRANSPORT:
4163
4164 DEBUG(D_transport) debug_printf("Leaving %s transport\n", tblock->name);
4165
4166 return TRUE; /* Each address has its status */
4167 }
4168
4169 /* vi: aw ai sw=2
4170 */
4171 /* End of transport/smtp.c */
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