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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_NOMATCH:
1227 return dane_required ? FAIL : FAIL_FORCED;
1228
1229 default:
1230 case DNS_FAIL:
1231 return dane_required ? FAIL : DEFER;
1232 }
1233 }
1234 #endif
1235
1236
1237
1238 typedef struct smtp_compare_s
1239 {
1240 uschar *current_sender_address;
1241 struct transport_instance *tblock;
1242 } smtp_compare_t;
1243
1244 /*
1245 Create a unique string that identifies this message, it is based on
1246 sender_address, helo_data and tls_certificate if enabled. */
1247
1248 static uschar *
1249 smtp_local_identity(uschar * sender, struct transport_instance * tblock)
1250 {
1251 address_item * addr1;
1252 uschar * if1 = US"";
1253 uschar * helo1 = US"";
1254 #ifdef SUPPORT_TLS
1255 uschar * tlsc1 = US"";
1256 #endif
1257 uschar * save_sender_address = sender_address;
1258 uschar * local_identity = NULL;
1259 smtp_transport_options_block * ob =
1260 (smtp_transport_options_block *)tblock->options_block;
1261
1262 sender_address = sender;
1263
1264 addr1 = deliver_make_addr (sender, TRUE);
1265 deliver_set_expansions(addr1);
1266
1267 if (ob->interface)
1268 if1 = expand_string(ob->interface);
1269
1270 if (ob->helo_data)
1271 helo1 = expand_string(ob->helo_data);
1272
1273 #ifdef SUPPORT_TLS
1274 if (ob->tls_certificate)
1275 tlsc1 = expand_string(ob->tls_certificate);
1276 local_identity = string_sprintf ("%s^%s^%s", if1, helo1, tlsc1);
1277 #else
1278 local_identity = string_sprintf ("%s^%s", if1, helo1);
1279 #endif
1280
1281 deliver_set_expansions(NULL);
1282 sender_address = save_sender_address;
1283
1284 return local_identity;
1285 }
1286
1287
1288
1289 /* This routine is a callback that is called from transport_check_waiting.
1290 This function will evaluate the incoming message versus the previous
1291 message. If the incoming message is using a different local identity then
1292 we will veto this new message. */
1293
1294 static BOOL
1295 smtp_are_same_identities(uschar * message_id, smtp_compare_t * s_compare)
1296 {
1297 uschar * message_local_identity,
1298 * current_local_identity,
1299 * new_sender_address;
1300
1301 current_local_identity =
1302 smtp_local_identity(s_compare->current_sender_address, s_compare->tblock);
1303
1304 if (!(new_sender_address = deliver_get_sender_address(message_id)))
1305 return 0;
1306
1307 message_local_identity =
1308 smtp_local_identity(new_sender_address, s_compare->tblock);
1309
1310 return Ustrcmp(current_local_identity, message_local_identity) == 0;
1311 }
1312
1313
1314
1315 uschar
1316 ehlo_response(uschar * buf, size_t bsize, uschar checks)
1317 {
1318 #ifdef SUPPORT_TLS
1319 if ( checks & PEER_OFFERED_TLS
1320 && pcre_exec(regex_STARTTLS, NULL, CS buf, bsize, 0, PCRE_EOPT, NULL, 0) < 0)
1321 checks &= ~PEER_OFFERED_TLS;
1322 #endif
1323
1324 if ( checks & PEER_OFFERED_IGNQ
1325 && pcre_exec(regex_IGNOREQUOTA, NULL, CS buf, bsize, 0,
1326 PCRE_EOPT, NULL, 0) < 0)
1327 checks &= ~PEER_OFFERED_IGNQ;
1328
1329 if ( checks & PEER_OFFERED_CHUNKING
1330 && pcre_exec(regex_CHUNKING, NULL, CS buf, bsize, 0, PCRE_EOPT, NULL, 0) < 0)
1331 checks &= ~PEER_OFFERED_CHUNKING;
1332
1333 #ifndef DISABLE_PRDR
1334 if ( checks & PEER_OFFERED_PRDR
1335 && pcre_exec(regex_PRDR, NULL, CS buf, bsize, 0, PCRE_EOPT, NULL, 0) < 0)
1336 checks &= ~PEER_OFFERED_PRDR;
1337 #endif
1338
1339 #ifdef SUPPORT_I18N
1340 if ( checks & PEER_OFFERED_UTF8
1341 && pcre_exec(regex_UTF8, NULL, CS buf, bsize, 0, PCRE_EOPT, NULL, 0) < 0)
1342 checks &= ~PEER_OFFERED_UTF8;
1343 #endif
1344
1345 if ( checks & PEER_OFFERED_DSN
1346 && pcre_exec(regex_DSN, NULL, CS buf, bsize, 0, PCRE_EOPT, NULL, 0) < 0)
1347 checks &= ~PEER_OFFERED_DSN;
1348
1349 if ( checks & PEER_OFFERED_PIPE
1350 && pcre_exec(regex_PIPELINING, NULL, CS buf, bsize, 0,
1351 PCRE_EOPT, NULL, 0) < 0)
1352 checks &= ~PEER_OFFERED_PIPE;
1353
1354 if ( checks & PEER_OFFERED_SIZE
1355 && pcre_exec(regex_SIZE, NULL, CS buf, bsize, 0, PCRE_EOPT, NULL, 0) < 0)
1356 checks &= ~PEER_OFFERED_SIZE;
1357
1358 return checks;
1359 }
1360
1361
1362
1363 /* Callback for emitting a BDAT data chunk header.
1364
1365 If given a nonzero size, first flush any buffered SMTP commands
1366 then emit the command.
1367
1368 Reap previous SMTP command responses if requested.
1369 Reap one SMTP command response if requested.
1370
1371 Returns: OK or ERROR
1372 */
1373
1374 static int
1375 smtp_chunk_cmd_callback(int fd, transport_ctx * tctx,
1376 unsigned chunk_size, unsigned flags)
1377 {
1378 smtp_transport_options_block * ob =
1379 (smtp_transport_options_block *)(tctx->tblock->options_block);
1380 int cmd_count = 0;
1381 int prev_cmd_count;
1382 uschar * buffer = tctx->buffer;
1383
1384
1385 /* Write SMTP chunk header command */
1386
1387 if (chunk_size > 0)
1388 if((cmd_count = smtp_write_command(tctx->outblock, FALSE, "BDAT %u%s\r\n",
1389 chunk_size,
1390 flags & tc_chunk_last ? " LAST" : "")
1391 ) < 0) return ERROR;
1392
1393 prev_cmd_count = cmd_count += tctx->cmd_count;
1394
1395 /* Reap responses for any previous, but not one we just emitted */
1396
1397 if (chunk_size > 0)
1398 prev_cmd_count--;
1399 if (tctx->pending_BDAT)
1400 prev_cmd_count--;
1401
1402 if (flags & tc_reap_prev && prev_cmd_count > 0)
1403 {
1404
1405 switch(sync_responses(tctx->first_addr, tctx->tblock->rcpt_include_affixes,
1406 tctx->sync_addr, tctx->host, prev_cmd_count,
1407 ob->address_retry_include_sender,
1408 tctx->pending_MAIL, 0,
1409 tctx->inblock,
1410 ob->command_timeout,
1411 buffer, DELIVER_BUFFER_SIZE))
1412 {
1413 case 1: /* 2xx (only) => OK */
1414 case 3: tctx->good_RCPT = TRUE; /* 2xx & 5xx => OK & progress made */
1415 case 2: *tctx->completed_address = TRUE; /* 5xx (only) => progress made */
1416 case 0: break; /* No 2xx or 5xx, but no probs */
1417
1418 case -1: /* Timeout on RCPT */
1419 default: return ERROR; /* I/O error, or any MAIL/DATA error */
1420 }
1421 cmd_count = 1;
1422 if (!tctx->pending_BDAT)
1423 pipelining_active = FALSE;
1424 }
1425
1426 /* Reap response for the cmd we just emitted, or an outstanding BDAT */
1427
1428 if (flags & tc_reap_one || tctx->pending_BDAT)
1429 {
1430 if (!smtp_read_response(tctx->inblock, buffer, DELIVER_BUFFER_SIZE, '2',
1431 ob->command_timeout))
1432 {
1433 if (errno == 0 && buffer[0] == '4')
1434 {
1435 errno = ERRNO_DATA4XX; /*XXX does this actually get used? */
1436 tctx->first_addr->more_errno |=
1437 ((buffer[1] - '0')*10 + buffer[2] - '0') << 8;
1438 }
1439 return ERROR;
1440 }
1441 cmd_count--;
1442 tctx->pending_BDAT = FALSE;
1443 pipelining_active = FALSE;
1444 }
1445 else if (chunk_size > 0)
1446 tctx->pending_BDAT = TRUE;
1447
1448
1449 tctx->cmd_count = cmd_count;
1450 return OK;
1451 }
1452
1453
1454
1455 /*************************************************
1456 * Deliver address list to given host *
1457 *************************************************/
1458
1459 /* If continue_hostname is not null, we get here only when continuing to
1460 deliver down an existing channel. The channel was passed as the standard
1461 input. TLS is never active on a passed channel; the previous process always
1462 closes it down before passing the connection on.
1463
1464 Otherwise, we have to make a connection to the remote host, and do the
1465 initial protocol exchange.
1466
1467 When running as an MUA wrapper, if the sender or any recipient is rejected,
1468 temporarily or permanently, we force failure for all recipients.
1469
1470 Arguments:
1471 addrlist chain of potential addresses to deliver; only those whose
1472 transport_return field is set to PENDING_DEFER are currently
1473 being processed; others should be skipped - they have either
1474 been delivered to an earlier host or IP address, or been
1475 failed by one of them.
1476 host host to deliver to
1477 host_af AF_INET or AF_INET6
1478 port default TCP/IP port to use, in host byte order
1479 interface interface to bind to, or NULL
1480 tblock transport instance block
1481 message_defer set TRUE if yield is OK, but all addresses were deferred
1482 because of a non-recipient, non-host failure, that is, a
1483 4xx response to MAIL FROM, DATA, or ".". This is a defer
1484 that is specific to the message.
1485 suppress_tls if TRUE, don't attempt a TLS connection - this is set for
1486 a second attempt after TLS initialization fails
1487
1488 Returns: OK - the connection was made and the delivery attempted;
1489 the result for each address is in its data block.
1490 DEFER - the connection could not be made, or something failed
1491 while setting up the SMTP session, or there was a
1492 non-message-specific error, such as a timeout.
1493 ERROR - a filter command is specified for this transport,
1494 and there was a problem setting it up; OR helo_data
1495 or add_headers or authenticated_sender is specified
1496 for this transport, and the string failed to expand
1497 */
1498
1499 static int
1500 smtp_deliver(address_item *addrlist, host_item *host, int host_af, int port,
1501 uschar *interface, transport_instance *tblock,
1502 BOOL *message_defer, BOOL suppress_tls)
1503 {
1504 address_item *addr;
1505 address_item *sync_addr;
1506 address_item *first_addr = addrlist;
1507 int yield = OK;
1508 int address_count;
1509 int save_errno;
1510 int rc;
1511 time_t start_delivery_time = time(NULL);
1512 smtp_transport_options_block *ob =
1513 (smtp_transport_options_block *)(tblock->options_block);
1514 BOOL lmtp = strcmpic(ob->protocol, US"lmtp") == 0;
1515 BOOL smtps = strcmpic(ob->protocol, US"smtps") == 0;
1516 BOOL ok = FALSE;
1517 BOOL send_rset = TRUE;
1518 BOOL send_quit = TRUE;
1519 BOOL setting_up = TRUE;
1520 BOOL completed_address = FALSE;
1521 BOOL esmtp = TRUE;
1522 BOOL pending_MAIL;
1523 BOOL pass_message = FALSE;
1524 uschar peer_offered = 0;
1525 #ifndef DISABLE_PRDR
1526 BOOL prdr_active;
1527 #endif
1528 #ifdef SUPPORT_I18N
1529 BOOL utf8_needed = FALSE;
1530 #endif
1531 BOOL dsn_all_lasthop = TRUE;
1532 #if defined(SUPPORT_TLS) && defined(EXPERIMENTAL_DANE)
1533 BOOL dane = FALSE;
1534 BOOL dane_required = verify_check_given_host(&ob->hosts_require_dane, host) == OK;
1535 dns_answer tlsa_dnsa;
1536 #endif
1537 smtp_inblock inblock;
1538 smtp_outblock outblock;
1539 int max_rcpt = tblock->max_addresses;
1540 uschar *igquotstr = US"";
1541
1542 #ifdef EXPERIMENTAL_DSN_INFO
1543 uschar *smtp_greeting = NULL;
1544 uschar *helo_response = NULL;
1545 #endif
1546 uschar *helo_data = NULL;
1547
1548 uschar *message = NULL;
1549 uschar new_message_id[MESSAGE_ID_LENGTH + 1];
1550 uschar *p;
1551 uschar buffer[DELIVER_BUFFER_SIZE];
1552 uschar inbuffer[4096];
1553 uschar outbuffer[4096];
1554
1555 suppress_tls = suppress_tls; /* stop compiler warning when no TLS support */
1556
1557 *message_defer = FALSE;
1558 smtp_command = US"initial connection";
1559 if (max_rcpt == 0) max_rcpt = 999999;
1560
1561 /* Set up the buffer for reading SMTP response packets. */
1562
1563 inblock.buffer = inbuffer;
1564 inblock.buffersize = sizeof(inbuffer);
1565 inblock.ptr = inbuffer;
1566 inblock.ptrend = inbuffer;
1567
1568 /* Set up the buffer for holding SMTP commands while pipelining */
1569
1570 outblock.buffer = outbuffer;
1571 outblock.buffersize = sizeof(outbuffer);
1572 outblock.ptr = outbuffer;
1573 outblock.cmd_count = 0;
1574 outblock.authenticating = FALSE;
1575
1576 /* Reset the parameters of a TLS session. */
1577
1578 tls_out.bits = 0;
1579 tls_out.cipher = NULL; /* the one we may use for this transport */
1580 tls_out.ourcert = NULL;
1581 tls_out.peercert = NULL;
1582 tls_out.peerdn = NULL;
1583 #if defined(SUPPORT_TLS) && !defined(USE_GNUTLS)
1584 tls_out.sni = NULL;
1585 #endif
1586 tls_out.ocsp = OCSP_NOT_REQ;
1587
1588 /* Flip the legacy TLS-related variables over to the outbound set in case
1589 they're used in the context of the transport. Don't bother resetting
1590 afterward as we're in a subprocess. */
1591
1592 tls_modify_variables(&tls_out);
1593
1594 #ifndef SUPPORT_TLS
1595 if (smtps)
1596 {
1597 set_errno_nohost(addrlist, ERRNO_TLSFAILURE, US"TLS support not available",
1598 DEFER, FALSE);
1599 return ERROR;
1600 }
1601 #endif
1602
1603 /* Make a connection to the host if this isn't a continued delivery, and handle
1604 the initial interaction and HELO/EHLO/LHLO. Connect timeout errors are handled
1605 specially so they can be identified for retries. */
1606
1607 if (continue_hostname == NULL)
1608 {
1609 /* This puts port into host->port */
1610 inblock.sock = outblock.sock =
1611 smtp_connect(host, host_af, port, interface, ob->connect_timeout, tblock);
1612
1613 if (inblock.sock < 0)
1614 {
1615 set_errno_nohost(addrlist, (errno == ETIMEDOUT)? ERRNO_CONNECTTIMEOUT : errno,
1616 NULL, DEFER, FALSE);
1617 return DEFER;
1618 }
1619
1620 #if defined(SUPPORT_TLS) && defined(EXPERIMENTAL_DANE)
1621 {
1622 tls_out.dane_verified = FALSE;
1623 tls_out.tlsa_usage = 0;
1624
1625 if (host->dnssec == DS_YES)
1626 {
1627 if( dane_required
1628 || verify_check_given_host(&ob->hosts_try_dane, host) == OK
1629 )
1630 switch (rc = tlsa_lookup(host, &tlsa_dnsa, dane_required))
1631 {
1632 case OK: dane = TRUE; break;
1633 case FAIL_FORCED: break;
1634 default: set_errno_nohost(addrlist, ERRNO_DNSDEFER,
1635 string_sprintf("DANE error: tlsa lookup %s",
1636 rc == DEFER ? "DEFER" : "FAIL"),
1637 rc, FALSE);
1638 return rc;
1639 }
1640 }
1641 else if (dane_required)
1642 {
1643 set_errno_nohost(addrlist, ERRNO_DNSDEFER,
1644 string_sprintf("DANE error: %s lookup not DNSSEC", host->name),
1645 FAIL, FALSE);
1646 return FAIL;
1647 }
1648
1649 if (dane)
1650 ob->tls_tempfail_tryclear = FALSE;
1651 }
1652 #endif /*DANE*/
1653
1654 /* Expand the greeting message while waiting for the initial response. (Makes
1655 sense if helo_data contains ${lookup dnsdb ...} stuff). The expansion is
1656 delayed till here so that $sending_interface and $sending_port are set. */
1657
1658 helo_data = expand_string(ob->helo_data);
1659 #ifdef SUPPORT_I18N
1660 if (helo_data)
1661 {
1662 uschar * errstr = NULL;
1663 if ((helo_data = string_domain_utf8_to_alabel(helo_data, &errstr)), errstr)
1664 {
1665 errstr = string_sprintf("failed to expand helo_data: %s", errstr);
1666 set_errno_nohost(addrlist, ERRNO_EXPANDFAIL, errstr, DEFER, FALSE);
1667 yield = DEFER;
1668 goto SEND_QUIT;
1669 }
1670 }
1671 #endif
1672
1673 /* The first thing is to wait for an initial OK response. The dreaded "goto"
1674 is nevertheless a reasonably clean way of programming this kind of logic,
1675 where you want to escape on any error. */
1676
1677 if (!smtps)
1678 {
1679 BOOL good_response = smtp_read_response(&inblock, buffer, sizeof(buffer),
1680 '2', ob->command_timeout);
1681 #ifdef EXPERIMENTAL_DSN_INFO
1682 smtp_greeting = string_copy(buffer);
1683 #endif
1684 if (!good_response) goto RESPONSE_FAILED;
1685
1686 #ifndef DISABLE_EVENT
1687 {
1688 uschar * s;
1689 lookup_dnssec_authenticated = host->dnssec==DS_YES ? US"yes"
1690 : host->dnssec==DS_NO ? US"no" : NULL;
1691 s = event_raise(tblock->event_action, US"smtp:connect", buffer);
1692 if (s)
1693 {
1694 set_errno_nohost(addrlist, ERRNO_EXPANDFAIL,
1695 string_sprintf("deferred by smtp:connect event expansion: %s", s),
1696 DEFER, FALSE);
1697 yield = DEFER;
1698 goto SEND_QUIT;
1699 }
1700 }
1701 #endif
1702
1703 /* Now check if the helo_data expansion went well, and sign off cleanly if
1704 it didn't. */
1705
1706 if (helo_data == NULL)
1707 {
1708 uschar *message = string_sprintf("failed to expand helo_data: %s",
1709 expand_string_message);
1710 set_errno_nohost(addrlist, ERRNO_EXPANDFAIL, message, DEFER, FALSE);
1711 yield = DEFER;
1712 goto SEND_QUIT;
1713 }
1714 }
1715
1716 /** Debugging without sending a message
1717 addrlist->transport_return = DEFER;
1718 goto SEND_QUIT;
1719 **/
1720
1721 /* Errors that occur after this point follow an SMTP command, which is
1722 left in big_buffer by smtp_write_command() for use in error messages. */
1723
1724 smtp_command = big_buffer;
1725
1726 /* Tell the remote who we are...
1727
1728 February 1998: A convention has evolved that ESMTP-speaking MTAs include the
1729 string "ESMTP" in their greeting lines, so make Exim send EHLO if the
1730 greeting is of this form. The assumption was that the far end supports it
1731 properly... but experience shows that there are some that give 5xx responses,
1732 even though the banner includes "ESMTP" (there's a bloody-minded one that
1733 says "ESMTP not spoken here"). Cope with that case.
1734
1735 September 2000: Time has passed, and it seems reasonable now to always send
1736 EHLO at the start. It is also convenient to make the change while installing
1737 the TLS stuff.
1738
1739 July 2003: Joachim Wieland met a broken server that advertises "PIPELINING"
1740 but times out after sending MAIL FROM, RCPT TO and DATA all together. There
1741 would be no way to send out the mails, so there is now a host list
1742 "hosts_avoid_esmtp" that disables ESMTP for special hosts and solves the
1743 PIPELINING problem as well. Maybe it can also be useful to cure other
1744 problems with broken servers.
1745
1746 Exim originally sent "Helo" at this point and ran for nearly a year that way.
1747 Then somebody tried it with a Microsoft mailer... It seems that all other
1748 mailers use upper case for some reason (the RFC is quite clear about case
1749 independence) so, for peace of mind, I gave in. */
1750
1751 esmtp = verify_check_given_host(&ob->hosts_avoid_esmtp, host) != OK;
1752
1753 /* Alas; be careful, since this goto is not an error-out, so conceivably
1754 we might set data between here and the target which we assume to exist
1755 and be usable. I can see this coming back to bite us. */
1756 #ifdef SUPPORT_TLS
1757 if (smtps)
1758 {
1759 smtp_peer_options |= PEER_OFFERED_TLS;
1760 suppress_tls = FALSE;
1761 ob->tls_tempfail_tryclear = FALSE;
1762 smtp_command = US"SSL-on-connect";
1763 goto TLS_NEGOTIATE;
1764 }
1765 #endif
1766
1767 if (esmtp)
1768 {
1769 if (smtp_write_command(&outblock, FALSE, "%s %s\r\n",
1770 lmtp? "LHLO" : "EHLO", helo_data) < 0)
1771 goto SEND_FAILED;
1772 if (!smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
1773 ob->command_timeout))
1774 {
1775 if (errno != 0 || buffer[0] == 0 || lmtp)
1776 {
1777 #ifdef EXPERIMENTAL_DSN_INFO
1778 helo_response = string_copy(buffer);
1779 #endif
1780 goto RESPONSE_FAILED;
1781 }
1782 esmtp = FALSE;
1783 }
1784 #ifdef EXPERIMENTAL_DSN_INFO
1785 helo_response = string_copy(buffer);
1786 #endif
1787 }
1788 else
1789 {
1790 DEBUG(D_transport)
1791 debug_printf("not sending EHLO (host matches hosts_avoid_esmtp)\n");
1792 }
1793
1794 if (!esmtp)
1795 {
1796 BOOL good_response;
1797
1798 if (smtp_write_command(&outblock, FALSE, "HELO %s\r\n", helo_data) < 0)
1799 goto SEND_FAILED;
1800 good_response = smtp_read_response(&inblock, buffer, sizeof(buffer),
1801 '2', ob->command_timeout);
1802 #ifdef EXPERIMENTAL_DSN_INFO
1803 helo_response = string_copy(buffer);
1804 #endif
1805 if (!good_response) goto RESPONSE_FAILED;
1806 }
1807
1808 peer_offered = smtp_peer_options = 0;
1809
1810 if (esmtp || lmtp)
1811 {
1812 peer_offered = ehlo_response(buffer, Ustrlen(buffer),
1813 PEER_OFFERED_TLS /* others checked later */
1814 );
1815
1816 /* Set tls_offered if the response to EHLO specifies support for STARTTLS. */
1817
1818 #ifdef SUPPORT_TLS
1819 smtp_peer_options |= peer_offered & PEER_OFFERED_TLS;
1820 #endif
1821 }
1822 }
1823
1824 /* For continuing deliveries down the same channel, the socket is the standard
1825 input, and we don't need to redo EHLO here (but may need to do so for TLS - see
1826 below). Set up the pointer to where subsequent commands will be left, for
1827 error messages. Note that smtp_peer_options will have been
1828 set from the command line if they were set in the process that passed the
1829 connection on. */
1830
1831 /*XXX continue case needs to propagate DSN_INFO, prob. in deliver.c
1832 as the contine goes via transport_pass_socket() and doublefork and exec.
1833 It does not wait. Unclear how we keep separate host's responses
1834 separate - we could match up by host ip+port as a bodge. */
1835
1836 else
1837 {
1838 inblock.sock = outblock.sock = fileno(stdin);
1839 smtp_command = big_buffer;
1840 host->port = port; /* Record the port that was used */
1841 }
1842
1843 /* If TLS is available on this connection, whether continued or not, attempt to
1844 start up a TLS session, unless the host is in hosts_avoid_tls. If successful,
1845 send another EHLO - the server may give a different answer in secure mode. We
1846 use a separate buffer for reading the response to STARTTLS so that if it is
1847 negative, the original EHLO data is available for subsequent analysis, should
1848 the client not be required to use TLS. If the response is bad, copy the buffer
1849 for error analysis. */
1850
1851 #ifdef SUPPORT_TLS
1852 if ( smtp_peer_options & PEER_OFFERED_TLS
1853 && !suppress_tls
1854 && verify_check_given_host(&ob->hosts_avoid_tls, host) != OK)
1855 {
1856 uschar buffer2[4096];
1857 if (smtp_write_command(&outblock, FALSE, "STARTTLS\r\n") < 0)
1858 goto SEND_FAILED;
1859
1860 /* If there is an I/O error, transmission of this message is deferred. If
1861 there is a temporary rejection of STARRTLS and tls_tempfail_tryclear is
1862 false, we also defer. However, if there is a temporary rejection of STARTTLS
1863 and tls_tempfail_tryclear is true, or if there is an outright rejection of
1864 STARTTLS, we carry on. This means we will try to send the message in clear,
1865 unless the host is in hosts_require_tls (tested below). */
1866
1867 if (!smtp_read_response(&inblock, buffer2, sizeof(buffer2), '2',
1868 ob->command_timeout))
1869 {
1870 if ( errno != 0
1871 || buffer2[0] == 0
1872 || (buffer2[0] == '4' && !ob->tls_tempfail_tryclear)
1873 )
1874 {
1875 Ustrncpy(buffer, buffer2, sizeof(buffer));
1876 goto RESPONSE_FAILED;
1877 }
1878 }
1879
1880 /* STARTTLS accepted: try to negotiate a TLS session. */
1881
1882 else
1883 TLS_NEGOTIATE:
1884 {
1885 int rc = tls_client_start(inblock.sock, host, addrlist, tblock
1886 # ifdef EXPERIMENTAL_DANE
1887 , dane ? &tlsa_dnsa : NULL
1888 # endif
1889 );
1890
1891 /* TLS negotiation failed; give an error. From outside, this function may
1892 be called again to try in clear on a new connection, if the options permit
1893 it for this host. */
1894
1895 if (rc != OK)
1896 {
1897 # ifdef EXPERIMENTAL_DANE
1898 if (rc == DEFER && dane)
1899 {
1900 log_write(0, LOG_MAIN,
1901 "DANE attempt failed; no TLS connection to %s [%s]",
1902 host->name, host->address);
1903 }
1904 # endif
1905
1906 save_errno = ERRNO_TLSFAILURE;
1907 message = US"failure while setting up TLS session";
1908 send_quit = FALSE;
1909 goto TLS_FAILED;
1910 }
1911
1912 /* TLS session is set up */
1913
1914 smtp_peer_options_wrap = smtp_peer_options;
1915 for (addr = addrlist; addr; addr = addr->next)
1916 if (addr->transport_return == PENDING_DEFER)
1917 {
1918 addr->cipher = tls_out.cipher;
1919 addr->ourcert = tls_out.ourcert;
1920 addr->peercert = tls_out.peercert;
1921 addr->peerdn = tls_out.peerdn;
1922 addr->ocsp = tls_out.ocsp;
1923 }
1924 }
1925 }
1926
1927 /* if smtps, we'll have smtp_command set to something else; always safe to
1928 reset it here. */
1929 smtp_command = big_buffer;
1930
1931 /* If we started TLS, redo the EHLO/LHLO exchange over the secure channel. If
1932 helo_data is null, we are dealing with a connection that was passed from
1933 another process, and so we won't have expanded helo_data above. We have to
1934 expand it here. $sending_ip_address and $sending_port are set up right at the
1935 start of the Exim process (in exim.c). */
1936
1937 if (tls_out.active >= 0)
1938 {
1939 char *greeting_cmd;
1940 BOOL good_response;
1941
1942 if (helo_data == NULL)
1943 {
1944 helo_data = expand_string(ob->helo_data);
1945 if (helo_data == NULL)
1946 {
1947 uschar *message = string_sprintf("failed to expand helo_data: %s",
1948 expand_string_message);
1949 set_errno_nohost(addrlist, ERRNO_EXPANDFAIL, message, DEFER, FALSE);
1950 yield = DEFER;
1951 goto SEND_QUIT;
1952 }
1953 }
1954
1955 /* For SMTPS we need to wait for the initial OK response. */
1956 if (smtps)
1957 {
1958 good_response = smtp_read_response(&inblock, buffer, sizeof(buffer),
1959 '2', ob->command_timeout);
1960 #ifdef EXPERIMENTAL_DSN_INFO
1961 smtp_greeting = string_copy(buffer);
1962 #endif
1963 if (!good_response) goto RESPONSE_FAILED;
1964 }
1965
1966 if (esmtp)
1967 greeting_cmd = "EHLO";
1968 else
1969 {
1970 greeting_cmd = "HELO";
1971 DEBUG(D_transport)
1972 debug_printf("not sending EHLO (host matches hosts_avoid_esmtp)\n");
1973 }
1974
1975 if (smtp_write_command(&outblock, FALSE, "%s %s\r\n",
1976 lmtp? "LHLO" : greeting_cmd, helo_data) < 0)
1977 goto SEND_FAILED;
1978 good_response = smtp_read_response(&inblock, buffer, sizeof(buffer),
1979 '2', ob->command_timeout);
1980 #ifdef EXPERIMENTAL_DSN_INFO
1981 helo_response = string_copy(buffer);
1982 #endif
1983 if (!good_response) goto RESPONSE_FAILED;
1984 smtp_peer_options = 0;
1985 }
1986
1987 /* If the host is required to use a secure channel, ensure that we
1988 have one. */
1989
1990 else if ( smtps
1991 # ifdef EXPERIMENTAL_DANE
1992 || dane
1993 # endif
1994 || verify_check_given_host(&ob->hosts_require_tls, host) == OK
1995 )
1996 {
1997 save_errno = ERRNO_TLSREQUIRED;
1998 message = string_sprintf("a TLS session is required, but %s",
1999 smtp_peer_options & PEER_OFFERED_TLS
2000 ? "an attempt to start TLS failed" : "the server did not offer TLS support");
2001 goto TLS_FAILED;
2002 }
2003 #endif /*SUPPORT_TLS*/
2004
2005 /* If TLS is active, we have just started it up and re-done the EHLO command,
2006 so its response needs to be analyzed. If TLS is not active and this is a
2007 continued session down a previously-used socket, we haven't just done EHLO, so
2008 we skip this. */
2009
2010 if (continue_hostname == NULL
2011 #ifdef SUPPORT_TLS
2012 || tls_out.active >= 0
2013 #endif
2014 )
2015 {
2016 if (esmtp || lmtp)
2017 {
2018 peer_offered = ehlo_response(buffer, Ustrlen(buffer),
2019 0 /* no TLS */
2020 | (lmtp && ob->lmtp_ignore_quota ? PEER_OFFERED_IGNQ : 0)
2021 | PEER_OFFERED_CHUNKING
2022 | PEER_OFFERED_PRDR
2023 #ifdef SUPPORT_I18N
2024 | (addrlist->prop.utf8_msg ? PEER_OFFERED_UTF8 : 0)
2025 /*XXX if we hand peercaps on to continued-conn processes,
2026 must not depend on this addr */
2027 #endif
2028 | PEER_OFFERED_DSN
2029 | PEER_OFFERED_PIPE
2030 | (ob->size_addition >= 0 ? PEER_OFFERED_SIZE : 0)
2031 );
2032
2033 /* Set for IGNOREQUOTA if the response to LHLO specifies support and the
2034 lmtp_ignore_quota option was set. */
2035
2036 igquotstr = peer_offered & PEER_OFFERED_IGNQ ? US" IGNOREQUOTA" : US"";
2037
2038 /* If the response to EHLO specified support for the SIZE parameter, note
2039 this, provided size_addition is non-negative. */
2040
2041 smtp_peer_options |= peer_offered & PEER_OFFERED_SIZE;
2042
2043 /* Note whether the server supports PIPELINING. If hosts_avoid_esmtp matched
2044 the current host, esmtp will be false, so PIPELINING can never be used. If
2045 the current host matches hosts_avoid_pipelining, don't do it. */
2046
2047 if ( peer_offered & PEER_OFFERED_PIPE
2048 && verify_check_given_host(&ob->hosts_avoid_pipelining, host) != OK)
2049 smtp_peer_options |= PEER_OFFERED_PIPE;
2050
2051 DEBUG(D_transport) debug_printf("%susing PIPELINING\n",
2052 smtp_peer_options & PEER_OFFERED_PIPE ? "" : "not ");
2053
2054 if ( peer_offered & PEER_OFFERED_CHUNKING
2055 && verify_check_given_host(&ob->hosts_try_chunking, host) != OK)
2056 peer_offered &= ~PEER_OFFERED_CHUNKING;
2057
2058 if (peer_offered & PEER_OFFERED_CHUNKING)
2059 {DEBUG(D_transport) debug_printf("CHUNKING usable\n");}
2060
2061 #ifndef DISABLE_PRDR
2062 if ( peer_offered & PEER_OFFERED_PRDR
2063 && verify_check_given_host(&ob->hosts_try_prdr, host) != OK)
2064 peer_offered &= ~PEER_OFFERED_PRDR;
2065
2066 if (peer_offered & PEER_OFFERED_PRDR)
2067 {DEBUG(D_transport) debug_printf("PRDR usable\n");}
2068 #endif
2069
2070 /* Note if the server supports DSN */
2071 smtp_peer_options |= peer_offered & PEER_OFFERED_DSN;
2072 DEBUG(D_transport) debug_printf("%susing DSN\n",
2073 peer_offered & PEER_OFFERED_DSN ? "" : "not ");
2074
2075 /* Note if the response to EHLO specifies support for the AUTH extension.
2076 If it has, check that this host is one we want to authenticate to, and do
2077 the business. The host name and address must be available when the
2078 authenticator's client driver is running. */
2079
2080 switch (yield = smtp_auth(buffer, sizeof(buffer), addrlist, host,
2081 ob, esmtp, &inblock, &outblock))
2082 {
2083 default: goto SEND_QUIT;
2084 case OK: break;
2085 case FAIL_SEND: goto SEND_FAILED;
2086 case FAIL: goto RESPONSE_FAILED;
2087 }
2088 }
2089 }
2090 pipelining_active = !!(smtp_peer_options & PEER_OFFERED_PIPE);
2091
2092 /* The setting up of the SMTP call is now complete. Any subsequent errors are
2093 message-specific. */
2094
2095 setting_up = FALSE;
2096
2097 #ifdef SUPPORT_I18N
2098 if (addrlist->prop.utf8_msg)
2099 {
2100 utf8_needed = !addrlist->prop.utf8_downcvt
2101 && !addrlist->prop.utf8_downcvt_maybe;
2102 DEBUG(D_transport) if (!utf8_needed) debug_printf("utf8: %s downconvert\n",
2103 addrlist->prop.utf8_downcvt ? "mandatory" : "optional");
2104 }
2105
2106 /* If this is an international message we need the host to speak SMTPUTF8 */
2107 if (utf8_needed && !(peer_offered & PEER_OFFERED_UTF8))
2108 {
2109 errno = ERRNO_UTF8_FWD;
2110 goto RESPONSE_FAILED;
2111 }
2112 #endif
2113
2114 /* If there is a filter command specified for this transport, we can now
2115 set it up. This cannot be done until the identify of the host is known. */
2116
2117 if (tblock->filter_command != NULL)
2118 {
2119 BOOL rc;
2120 uschar buffer[64];
2121 sprintf(CS buffer, "%.50s transport", tblock->name);
2122 rc = transport_set_up_command(&transport_filter_argv, tblock->filter_command,
2123 TRUE, DEFER, addrlist, buffer, NULL);
2124 transport_filter_timeout = tblock->filter_timeout;
2125
2126 /* On failure, copy the error to all addresses, abandon the SMTP call, and
2127 yield ERROR. */
2128
2129 if (!rc)
2130 {
2131 set_errno_nohost(addrlist->next, addrlist->basic_errno, addrlist->message, DEFER,
2132 FALSE);
2133 yield = ERROR;
2134 goto SEND_QUIT;
2135 }
2136
2137 if ( transport_filter_argv
2138 && *transport_filter_argv
2139 && **transport_filter_argv
2140 && peer_offered & PEER_OFFERED_CHUNKING
2141 )
2142 {
2143 peer_offered &= ~PEER_OFFERED_CHUNKING;
2144 DEBUG(D_transport) debug_printf("CHUNKING not usable due to transport filter\n");
2145 }
2146 }
2147
2148
2149 /* For messages that have more than the maximum number of envelope recipients,
2150 we want to send several transactions down the same SMTP connection. (See
2151 comments in deliver.c as to how this reconciles, heuristically, with
2152 remote_max_parallel.) This optimization was added to Exim after the following
2153 code was already working. The simplest way to put it in without disturbing the
2154 code was to use a goto to jump back to this point when there is another
2155 transaction to handle. */
2156
2157 SEND_MESSAGE:
2158 sync_addr = first_addr;
2159 address_count = 0;
2160 ok = FALSE;
2161 send_rset = TRUE;
2162 completed_address = FALSE;
2163
2164
2165 /* Initiate a message transfer. If we know the receiving MTA supports the SIZE
2166 qualification, send it, adding something to the message size to allow for
2167 imprecision and things that get added en route. Exim keeps the number of lines
2168 in a message, so we can give an accurate value for the original message, but we
2169 need some additional to handle added headers. (Double "." characters don't get
2170 included in the count.) */
2171
2172 p = buffer;
2173 *p = 0;
2174
2175 if (peer_offered & PEER_OFFERED_SIZE)
2176 {
2177 sprintf(CS p, " SIZE=%d", message_size+message_linecount+ob->size_addition);
2178 while (*p) p++;
2179 }
2180
2181 #ifndef DISABLE_PRDR
2182 prdr_active = FALSE;
2183 if (peer_offered & PEER_OFFERED_PRDR)
2184 for (addr = first_addr; addr; addr = addr->next)
2185 if (addr->transport_return == PENDING_DEFER)
2186 {
2187 for (addr = addr->next; addr; addr = addr->next)
2188 if (addr->transport_return == PENDING_DEFER)
2189 { /* at least two recipients to send */
2190 prdr_active = TRUE;
2191 sprintf(CS p, " PRDR"); p += 5;
2192 break;
2193 }
2194 break;
2195 }
2196 #endif
2197
2198 #ifdef SUPPORT_I18N
2199 if ( addrlist->prop.utf8_msg
2200 && !addrlist->prop.utf8_downcvt
2201 && peer_offered & PEER_OFFERED_UTF8
2202 )
2203 sprintf(CS p, " SMTPUTF8"), p += 9;
2204 #endif
2205
2206 /* check if all addresses have lasthop flag */
2207 /* do not send RET and ENVID if true */
2208 for (dsn_all_lasthop = TRUE, addr = first_addr;
2209 address_count < max_rcpt && addr != NULL;
2210 addr = addr->next)
2211 if ((addr->dsn_flags & rf_dsnlasthop) != 1)
2212 {
2213 dsn_all_lasthop = FALSE;
2214 break;
2215 }
2216
2217 /* Add any DSN flags to the mail command */
2218
2219 if (peer_offered & PEER_OFFERED_DSN && !dsn_all_lasthop)
2220 {
2221 if (dsn_ret == dsn_ret_hdrs)
2222 { Ustrcpy(p, " RET=HDRS"); p += 9; }
2223 else if (dsn_ret == dsn_ret_full)
2224 { Ustrcpy(p, " RET=FULL"); p += 9; }
2225
2226 if (dsn_envid)
2227 {
2228 string_format(p, sizeof(buffer) - (p-buffer), " ENVID=%s", dsn_envid);
2229 while (*p) p++;
2230 }
2231 }
2232
2233 /* If an authenticated_sender override has been specified for this transport
2234 instance, expand it. If the expansion is forced to fail, and there was already
2235 an authenticated_sender for this message, the original value will be used.
2236 Other expansion failures are serious. An empty result is ignored, but there is
2237 otherwise no check - this feature is expected to be used with LMTP and other
2238 cases where non-standard addresses (e.g. without domains) might be required. */
2239
2240 if (smtp_mail_auth_str(p, sizeof(buffer) - (p-buffer), addrlist, ob))
2241 {
2242 yield = ERROR;
2243 goto SEND_QUIT;
2244 }
2245
2246 /* From here until we send the DATA command, we can make use of PIPELINING
2247 if the server host supports it. The code has to be able to check the responses
2248 at any point, for when the buffer fills up, so we write it totally generally.
2249 When PIPELINING is off, each command written reports that it has flushed the
2250 buffer. */
2251
2252 pending_MAIL = TRUE; /* The block starts with MAIL */
2253
2254 {
2255 uschar * s = return_path;
2256 #ifdef SUPPORT_I18N
2257 uschar * errstr = NULL;
2258
2259 /* If we must downconvert, do the from-address here. Remember we had to
2260 for the to-addresses (done below), and also (ugly) for re-doing when building
2261 the delivery log line. */
2262
2263 if ( addrlist->prop.utf8_msg
2264 && (addrlist->prop.utf8_downcvt || !(peer_offered & PEER_OFFERED_UTF8))
2265 )
2266 {
2267 if (s = string_address_utf8_to_alabel(return_path, &errstr), errstr)
2268 {
2269 set_errno_nohost(addrlist, ERRNO_EXPANDFAIL, errstr, DEFER, FALSE);
2270 yield = ERROR;
2271 goto SEND_QUIT;
2272 }
2273 setflag(addrlist, af_utf8_downcvt);
2274 }
2275 #endif
2276
2277 rc = smtp_write_command(&outblock, pipelining_active,
2278 "MAIL FROM:<%s>%s\r\n", s, buffer);
2279 }
2280
2281 mail_command = string_copy(big_buffer); /* Save for later error message */
2282
2283 switch(rc)
2284 {
2285 case -1: /* Transmission error */
2286 goto SEND_FAILED;
2287
2288 case +1: /* Block was sent */
2289 if (!smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
2290 ob->command_timeout))
2291 {
2292 if (errno == 0 && buffer[0] == '4')
2293 {
2294 errno = ERRNO_MAIL4XX;
2295 addrlist->more_errno |= ((buffer[1] - '0')*10 + buffer[2] - '0') << 8;
2296 }
2297 goto RESPONSE_FAILED;
2298 }
2299 pending_MAIL = FALSE;
2300 break;
2301 }
2302
2303 /* Pass over all the relevant recipient addresses for this host, which are the
2304 ones that have status PENDING_DEFER. If we are using PIPELINING, we can send
2305 several before we have to read the responses for those seen so far. This
2306 checking is done by a subroutine because it also needs to be done at the end.
2307 Send only up to max_rcpt addresses at a time, leaving first_addr pointing to
2308 the next one if not all are sent.
2309
2310 In the MUA wrapper situation, we want to flush the PIPELINING buffer for the
2311 last address because we want to abort if any recipients have any kind of
2312 problem, temporary or permanent. We know that all recipient addresses will have
2313 the PENDING_DEFER status, because only one attempt is ever made, and we know
2314 that max_rcpt will be large, so all addresses will be done at once. */
2315
2316 for (addr = first_addr;
2317 addr && address_count < max_rcpt;
2318 addr = addr->next)
2319 {
2320 int count;
2321 BOOL no_flush;
2322 uschar * rcpt_addr;
2323
2324 addr->dsn_aware = peer_offered & PEER_OFFERED_DSN
2325 ? dsn_support_yes : dsn_support_no;
2326
2327 if (addr->transport_return != PENDING_DEFER) continue;
2328
2329 address_count++;
2330 no_flush = pipelining_active && (!mua_wrapper || addr->next);
2331
2332 /* Add any DSN flags to the rcpt command and add to the sent string */
2333
2334 p = buffer;
2335 *p = 0;
2336
2337 if (peer_offered & PEER_OFFERED_DSN && !(addr->dsn_flags & rf_dsnlasthop))
2338 {
2339 if (addr->dsn_flags & rf_dsnflags)
2340 {
2341 int i;
2342 BOOL first = TRUE;
2343 Ustrcpy(p, " NOTIFY=");
2344 while (*p) p++;
2345 for (i = 0; i < 4; i++)
2346 if ((addr->dsn_flags & rf_list[i]) != 0)
2347 {
2348 if (!first) *p++ = ',';
2349 first = FALSE;
2350 Ustrcpy(p, rf_names[i]);
2351 while (*p) p++;
2352 }
2353 }
2354
2355 if (addr->dsn_orcpt)
2356 {
2357 string_format(p, sizeof(buffer) - (p-buffer), " ORCPT=%s",
2358 addr->dsn_orcpt);
2359 while (*p) p++;
2360 }
2361 }
2362
2363 /* Now send the RCPT command, and process outstanding responses when
2364 necessary. After a timeout on RCPT, we just end the function, leaving the
2365 yield as OK, because this error can often mean that there is a problem with
2366 just one address, so we don't want to delay the host. */
2367
2368 rcpt_addr = transport_rcpt_address(addr, tblock->rcpt_include_affixes);
2369
2370 #ifdef SUPPORT_I18N
2371 {
2372 uschar * dummy_errstr;
2373 if ( testflag(addrlist, af_utf8_downcvt)
2374 && (rcpt_addr = string_address_utf8_to_alabel(rcpt_addr, &dummy_errstr),
2375 dummy_errstr
2376 ) )
2377 {
2378 errno = ERRNO_EXPANDFAIL;
2379 goto SEND_FAILED;
2380 }
2381 }
2382 #endif
2383
2384 count = smtp_write_command(&outblock, no_flush, "RCPT TO:<%s>%s%s\r\n",
2385 rcpt_addr, igquotstr, buffer);
2386
2387 if (count < 0) goto SEND_FAILED;
2388 if (count > 0)
2389 {
2390 switch(sync_responses(first_addr, tblock->rcpt_include_affixes,
2391 &sync_addr, host, count, ob->address_retry_include_sender,
2392 pending_MAIL, 0, &inblock, ob->command_timeout, buffer,
2393 sizeof(buffer)))
2394 {
2395 case 3: ok = TRUE; /* 2xx & 5xx => OK & progress made */
2396 case 2: completed_address = TRUE; /* 5xx (only) => progress made */
2397 break;
2398
2399 case 1: ok = TRUE; /* 2xx (only) => OK, but if LMTP, */
2400 if (!lmtp) completed_address = TRUE; /* can't tell about progress yet */
2401 case 0: /* No 2xx or 5xx, but no probs */
2402 break;
2403
2404 case -1: goto END_OFF; /* Timeout on RCPT */
2405 default: goto RESPONSE_FAILED; /* I/O error, or any MAIL error */
2406 }
2407 pending_MAIL = FALSE; /* Dealt with MAIL */
2408 }
2409 } /* Loop for next address */
2410
2411 /* If we are an MUA wrapper, abort if any RCPTs were rejected, either
2412 permanently or temporarily. We should have flushed and synced after the last
2413 RCPT. */
2414
2415 if (mua_wrapper)
2416 {
2417 address_item *badaddr;
2418 for (badaddr = first_addr; badaddr; badaddr = badaddr->next)
2419 if (badaddr->transport_return != PENDING_OK)
2420 {
2421 /*XXX could we find a better errno than 0 here? */
2422 set_errno_nohost(addrlist, 0, badaddr->message, FAIL,
2423 testflag(badaddr, af_pass_message));
2424 ok = FALSE;
2425 break;
2426 }
2427 }
2428
2429 /* If ok is TRUE, we know we have got at least one good recipient, and must now
2430 send DATA, but if it is FALSE (in the normal, non-wrapper case), we may still
2431 have a good recipient buffered up if we are pipelining. We don't want to waste
2432 time sending DATA needlessly, so we only send it if either ok is TRUE or if we
2433 are pipelining. The responses are all handled by sync_responses().
2434 If using CHUNKING, do not send a BDAT until we know how big a chunk we want
2435 to send is. */
2436
2437 if ( !(peer_offered & PEER_OFFERED_CHUNKING)
2438 && (ok || (pipelining_active && !mua_wrapper)))
2439 {
2440 int count = smtp_write_command(&outblock, FALSE, "DATA\r\n");
2441
2442 if (count < 0) goto SEND_FAILED;
2443 switch(sync_responses(first_addr, tblock->rcpt_include_affixes, &sync_addr,
2444 host, count, ob->address_retry_include_sender, pending_MAIL,
2445 ok ? +1 : -1, &inblock, ob->command_timeout, buffer, sizeof(buffer)))
2446 {
2447 case 3: ok = TRUE; /* 2xx & 5xx => OK & progress made */
2448 case 2: completed_address = TRUE; /* 5xx (only) => progress made */
2449 break;
2450
2451 case 1: ok = TRUE; /* 2xx (only) => OK, but if LMTP, */
2452 if (!lmtp) completed_address = TRUE; /* can't tell about progress yet */
2453 case 0: break; /* No 2xx or 5xx, but no probs */
2454
2455 case -1: goto END_OFF; /* Timeout on RCPT */
2456 default: goto RESPONSE_FAILED; /* I/O error, or any MAIL/DATA error */
2457 }
2458 pipelining_active = FALSE;
2459 }
2460
2461 /* If there were no good recipients (but otherwise there have been no
2462 problems), just set ok TRUE, since we have handled address-specific errors
2463 already. Otherwise, it's OK to send the message. Use the check/escape mechanism
2464 for handling the SMTP dot-handling protocol, flagging to apply to headers as
2465 well as body. Set the appropriate timeout value to be used for each chunk.
2466 (Haven't been able to make it work using select() for writing yet.) */
2467
2468 if (!(peer_offered & PEER_OFFERED_CHUNKING) && !ok)
2469 {
2470 /* Save the first address of the next batch. */
2471 first_addr = addr;
2472
2473 ok = TRUE;
2474 }
2475 else
2476 {
2477 transport_ctx tctx = {
2478 tblock,
2479 addrlist,
2480 US".", US"..", /* Escaping strings */
2481 topt_use_crlf | topt_escape_headers
2482 | (tblock->body_only ? topt_no_headers : 0)
2483 | (tblock->headers_only ? topt_no_body : 0)
2484 | (tblock->return_path_add ? topt_add_return_path : 0)
2485 | (tblock->delivery_date_add ? topt_add_delivery_date : 0)
2486 | (tblock->envelope_to_add ? topt_add_envelope_to : 0),
2487 };
2488
2489 /* If using CHUNKING we need a callback from the generic transport
2490 support to us, for the sending of BDAT smtp commands and the reaping
2491 of responses. The callback needs a whole bunch of state so set up
2492 a transport-context structure to be passed around. */
2493
2494 if (peer_offered & PEER_OFFERED_CHUNKING)
2495 {
2496 tctx.check_string = tctx.escape_string = NULL;
2497 tctx.options |= topt_use_bdat;
2498 tctx.chunk_cb = smtp_chunk_cmd_callback;
2499 tctx.inblock = &inblock;
2500 tctx.outblock = &outblock;
2501 tctx.host = host;
2502 tctx.first_addr = first_addr;
2503 tctx.sync_addr = &sync_addr;
2504 tctx.pending_MAIL = pending_MAIL;
2505 tctx.pending_BDAT = FALSE;
2506 tctx.good_RCPT = ok;
2507 tctx.completed_address = &completed_address;
2508 tctx.cmd_count = 0;
2509 tctx.buffer = buffer;
2510 }
2511 else
2512 tctx.options |= topt_end_dot;
2513
2514 /* Save the first address of the next batch. */
2515 first_addr = addr;
2516
2517 /* Responses from CHUNKING commands go in buffer. Otherwise,
2518 there has not been a response. */
2519
2520 buffer[0] = 0;
2521
2522 sigalrm_seen = FALSE;
2523 transport_write_timeout = ob->data_timeout;
2524 smtp_command = US"sending data block"; /* For error messages */
2525 DEBUG(D_transport|D_v)
2526 if (peer_offered & PEER_OFFERED_CHUNKING)
2527 debug_printf(" will write message using CHUNKING\n");
2528 else
2529 debug_printf(" SMTP>> writing message and terminating \".\"\n");
2530 transport_count = 0;
2531
2532 #ifndef DISABLE_DKIM
2533 ok = dkim_transport_write_message(inblock.sock, &tctx, &ob->dkim);
2534 #else
2535 ok = transport_write_message(inblock.sock, &tctx, 0);
2536 #endif
2537
2538 /* transport_write_message() uses write() because it is called from other
2539 places to write to non-sockets. This means that under some OS (e.g. Solaris)
2540 it can exit with "Broken pipe" as its error. This really means that the
2541 socket got closed at the far end. */
2542
2543 transport_write_timeout = 0; /* for subsequent transports */
2544
2545 /* Failure can either be some kind of I/O disaster (including timeout),
2546 or the failure of a transport filter or the expansion of added headers.
2547 Or, when CHUNKING, it can be a protocol-detected failure. */
2548
2549 if (!ok)
2550 goto RESPONSE_FAILED;
2551
2552 /* We used to send the terminating "." explicitly here, but because of
2553 buffering effects at both ends of TCP/IP connections, you don't gain
2554 anything by keeping it separate, so it might as well go in the final
2555 data buffer for efficiency. This is now done by setting the topt_end_dot
2556 flag above. */
2557
2558 smtp_command = US"end of data";
2559
2560 if (peer_offered & PEER_OFFERED_CHUNKING && tctx.cmd_count > 1)
2561 {
2562 /* Reap any outstanding MAIL & RCPT commands, but not a DATA-go-ahead */
2563 switch(sync_responses(first_addr, tblock->rcpt_include_affixes, &sync_addr,
2564 host, tctx.cmd_count-1, ob->address_retry_include_sender,
2565 pending_MAIL, 0,
2566 &inblock, ob->command_timeout, buffer, sizeof(buffer)))
2567 {
2568 case 3: ok = TRUE; /* 2xx & 5xx => OK & progress made */
2569 case 2: completed_address = TRUE; /* 5xx (only) => progress made */
2570 break;
2571
2572 case 1: ok = TRUE; /* 2xx (only) => OK, but if LMTP, */
2573 if (!lmtp) completed_address = TRUE; /* can't tell about progress yet */
2574 case 0: break; /* No 2xx or 5xx, but no probs */
2575
2576 case -1: goto END_OFF; /* Timeout on RCPT */
2577 default: goto RESPONSE_FAILED; /* I/O error, or any MAIL/DATA error */
2578 }
2579 }
2580
2581 #ifndef DISABLE_PRDR
2582 /* For PRDR we optionally get a partial-responses warning
2583 * followed by the individual responses, before going on with
2584 * the overall response. If we don't get the warning then deal
2585 * with per non-PRDR. */
2586 if(prdr_active)
2587 {
2588 ok = smtp_read_response(&inblock, buffer, sizeof(buffer), '3',
2589 ob->final_timeout);
2590 if (!ok && errno == 0) switch(buffer[0])
2591 {
2592 case '2': prdr_active = FALSE;
2593 ok = TRUE;
2594 break;
2595 case '4': errno = ERRNO_DATA4XX;
2596 addrlist->more_errno |=
2597 ((buffer[1] - '0')*10 + buffer[2] - '0') << 8;
2598 break;
2599 }
2600 }
2601 else
2602 #endif
2603
2604 /* For non-PRDR SMTP, we now read a single response that applies to the
2605 whole message. If it is OK, then all the addresses have been delivered. */
2606
2607 if (!lmtp)
2608 {
2609 ok = smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
2610 ob->final_timeout);
2611 if (!ok && errno == 0 && buffer[0] == '4')
2612 {
2613 errno = ERRNO_DATA4XX;
2614 addrlist->more_errno |= ((buffer[1] - '0')*10 + buffer[2] - '0') << 8;
2615 }
2616 }
2617
2618 /* For LMTP, we get back a response for every RCPT command that we sent;
2619 some may be accepted and some rejected. For those that get a response, their
2620 status is fixed; any that are accepted have been handed over, even if later
2621 responses crash - at least, that's how I read RFC 2033.
2622
2623 If all went well, mark the recipient addresses as completed, record which
2624 host/IPaddress they were delivered to, and cut out RSET when sending another
2625 message down the same channel. Write the completed addresses to the journal
2626 now so that they are recorded in case there is a crash of hardware or
2627 software before the spool gets updated. Also record the final SMTP
2628 confirmation if needed (for SMTP only). */
2629
2630 if (ok)
2631 {
2632 int flag = '=';
2633 int delivery_time = (int)(time(NULL) - start_delivery_time);
2634 int len;
2635 uschar *conf = NULL;
2636
2637 send_rset = FALSE;
2638 pipelining_active = FALSE;
2639
2640 /* Set up confirmation if needed - applies only to SMTP */
2641
2642 if (
2643 #ifdef DISABLE_EVENT
2644 LOGGING(smtp_confirmation) &&
2645 #endif
2646 !lmtp
2647 )
2648 {
2649 const uschar *s = string_printing(buffer);
2650 /* deconst cast ok here as string_printing was checked to have alloc'n'copied */
2651 conf = (s == buffer)? (uschar *)string_copy(s) : US s;
2652 }
2653
2654 /* Process all transported addresses - for LMTP or PRDR, read a status for
2655 each one. */
2656
2657 for (addr = addrlist; addr != first_addr; addr = addr->next)
2658 {
2659 if (addr->transport_return != PENDING_OK) continue;
2660
2661 /* LMTP - if the response fails badly (e.g. timeout), use it for all the
2662 remaining addresses. Otherwise, it's a return code for just the one
2663 address. For temporary errors, add a retry item for the address so that
2664 it doesn't get tried again too soon. */
2665
2666 #ifndef DISABLE_PRDR
2667 if (lmtp || prdr_active)
2668 #else
2669 if (lmtp)
2670 #endif
2671 {
2672 if (!smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
2673 ob->final_timeout))
2674 {
2675 if (errno != 0 || buffer[0] == 0) goto RESPONSE_FAILED;
2676 addr->message = string_sprintf(
2677 #ifndef DISABLE_PRDR
2678 "%s error after %s: %s", prdr_active ? "PRDR":"LMTP",
2679 #else
2680 "LMTP error after %s: %s",
2681 #endif
2682 big_buffer, string_printing(buffer));
2683 setflag(addr, af_pass_message); /* Allow message to go to user */
2684 if (buffer[0] == '5')
2685 addr->transport_return = FAIL;
2686 else
2687 {
2688 errno = ERRNO_DATA4XX;
2689 addr->more_errno |= ((buffer[1] - '0')*10 + buffer[2] - '0') << 8;
2690 addr->transport_return = DEFER;
2691 #ifndef DISABLE_PRDR
2692 if (!prdr_active)
2693 #endif
2694 retry_add_item(addr, addr->address_retry_key, 0);
2695 }
2696 continue;
2697 }
2698 completed_address = TRUE; /* NOW we can set this flag */
2699 if (LOGGING(smtp_confirmation))
2700 {
2701 const uschar *s = string_printing(buffer);
2702 /* deconst cast ok here as string_printing was checked to have alloc'n'copied */
2703 conf = (s == buffer)? (uschar *)string_copy(s) : US s;
2704 }
2705 }
2706
2707 /* SMTP, or success return from LMTP for this address. Pass back the
2708 actual host that was used. */
2709
2710 addr->transport_return = OK;
2711 addr->more_errno = delivery_time;
2712 addr->host_used = host;
2713 addr->special_action = flag;
2714 addr->message = conf;
2715 #ifndef DISABLE_PRDR
2716 if (prdr_active) addr->flags |= af_prdr_used;
2717 #endif
2718 if (peer_offered & PEER_OFFERED_CHUNKING) addr->flags |= af_chunking_used;
2719 flag = '-';
2720
2721 #ifndef DISABLE_PRDR
2722 if (!prdr_active)
2723 #endif
2724 {
2725 /* Update the journal. For homonymic addresses, use the base address plus
2726 the transport name. See lots of comments in deliver.c about the reasons
2727 for the complications when homonyms are involved. Just carry on after
2728 write error, as it may prove possible to update the spool file later. */
2729
2730 if (testflag(addr, af_homonym))
2731 sprintf(CS buffer, "%.500s/%s\n", addr->unique + 3, tblock->name);
2732 else
2733 sprintf(CS buffer, "%.500s\n", addr->unique);
2734
2735 DEBUG(D_deliver) debug_printf("journalling %s\n", buffer);
2736 len = Ustrlen(CS buffer);
2737 if (write(journal_fd, buffer, len) != len)
2738 log_write(0, LOG_MAIN|LOG_PANIC, "failed to write journal for "
2739 "%s: %s", buffer, strerror(errno));
2740 }
2741 }
2742
2743 #ifndef DISABLE_PRDR
2744 if (prdr_active)
2745 {
2746 /* PRDR - get the final, overall response. For any non-success
2747 upgrade all the address statuses. */
2748 ok = smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
2749 ob->final_timeout);
2750 if (!ok)
2751 {
2752 if(errno == 0 && buffer[0] == '4')
2753 {
2754 errno = ERRNO_DATA4XX;
2755 addrlist->more_errno |= ((buffer[1] - '0')*10 + buffer[2] - '0') << 8;
2756 }
2757 for (addr = addrlist; addr != first_addr; addr = addr->next)
2758 if (buffer[0] == '5' || addr->transport_return == OK)
2759 addr->transport_return = PENDING_OK; /* allow set_errno action */
2760 goto RESPONSE_FAILED;
2761 }
2762
2763 /* Update the journal, or setup retry. */
2764 for (addr = addrlist; addr != first_addr; addr = addr->next)
2765 if (addr->transport_return == OK)
2766 {
2767 if (testflag(addr, af_homonym))
2768 sprintf(CS buffer, "%.500s/%s\n", addr->unique + 3, tblock->name);
2769 else
2770 sprintf(CS buffer, "%.500s\n", addr->unique);
2771
2772 DEBUG(D_deliver) debug_printf("journalling(PRDR) %s\n", buffer);
2773 len = Ustrlen(CS buffer);
2774 if (write(journal_fd, buffer, len) != len)
2775 log_write(0, LOG_MAIN|LOG_PANIC, "failed to write journal for "
2776 "%s: %s", buffer, strerror(errno));
2777 }
2778 else if (addr->transport_return == DEFER)
2779 retry_add_item(addr, addr->address_retry_key, -2);
2780 }
2781 #endif
2782
2783 /* Ensure the journal file is pushed out to disk. */
2784
2785 if (EXIMfsync(journal_fd) < 0)
2786 log_write(0, LOG_MAIN|LOG_PANIC, "failed to fsync journal: %s",
2787 strerror(errno));
2788 }
2789 }
2790
2791
2792 /* Handle general (not specific to one address) failures here. The value of ok
2793 is used to skip over this code on the falling through case. A timeout causes a
2794 deferral. Other errors may defer or fail according to the response code, and
2795 may set up a special errno value, e.g. after connection chopped, which is
2796 assumed if errno == 0 and there is no text in the buffer. If control reaches
2797 here during the setting up phase (i.e. before MAIL FROM) then always defer, as
2798 the problem is not related to this specific message. */
2799
2800 if (!ok)
2801 {
2802 int code, set_rc;
2803 uschar * set_message;
2804
2805 RESPONSE_FAILED:
2806 {
2807 save_errno = errno;
2808 message = NULL;
2809 send_quit = check_response(host, &save_errno, addrlist->more_errno,
2810 buffer, &code, &message, &pass_message);
2811 goto FAILED;
2812 }
2813
2814 SEND_FAILED:
2815 {
2816 save_errno = errno;
2817 code = '4';
2818 message = US string_sprintf("send() to %s [%s] failed: %s",
2819 host->name, host->address, strerror(save_errno));
2820 send_quit = FALSE;
2821 goto FAILED;
2822 }
2823
2824 /* This label is jumped to directly when a TLS negotiation has failed,
2825 or was not done for a host for which it is required. Values will be set
2826 in message and save_errno, and setting_up will always be true. Treat as
2827 a temporary error. */
2828
2829 #ifdef SUPPORT_TLS
2830 TLS_FAILED:
2831 code = '4';
2832 #endif
2833
2834 /* If the failure happened while setting up the call, see if the failure was
2835 a 5xx response (this will either be on connection, or following HELO - a 5xx
2836 after EHLO causes it to try HELO). If so, fail all addresses, as this host is
2837 never going to accept them. For other errors during setting up (timeouts or
2838 whatever), defer all addresses, and yield DEFER, so that the host is not
2839 tried again for a while. */
2840
2841 FAILED:
2842 ok = FALSE; /* For when reached by GOTO */
2843 set_message = message;
2844
2845 if (setting_up)
2846 {
2847 if (code == '5')
2848 set_rc = FAIL;
2849 else
2850 yield = set_rc = DEFER;
2851 }
2852
2853 /* We want to handle timeouts after MAIL or "." and loss of connection after
2854 "." specially. They can indicate a problem with the sender address or with
2855 the contents of the message rather than a real error on the connection. These
2856 cases are treated in the same way as a 4xx response. This next bit of code
2857 does the classification. */
2858
2859 else
2860 {
2861 BOOL message_error;
2862
2863 switch(save_errno)
2864 {
2865 #ifdef SUPPORT_I18N
2866 case ERRNO_UTF8_FWD:
2867 code = '5';
2868 /*FALLTHROUGH*/
2869 #endif
2870 case 0:
2871 case ERRNO_MAIL4XX:
2872 case ERRNO_DATA4XX:
2873 message_error = TRUE;
2874 break;
2875
2876 case ETIMEDOUT:
2877 message_error = Ustrncmp(smtp_command,"MAIL",4) == 0 ||
2878 Ustrncmp(smtp_command,"end ",4) == 0;
2879 break;
2880
2881 case ERRNO_SMTPCLOSED:
2882 message_error = Ustrncmp(smtp_command,"end ",4) == 0;
2883 break;
2884
2885 default:
2886 message_error = FALSE;
2887 break;
2888 }
2889
2890 /* Handle the cases that are treated as message errors. These are:
2891
2892 (a) negative response or timeout after MAIL
2893 (b) negative response after DATA
2894 (c) negative response or timeout or dropped connection after "."
2895 (d) utf8 support required and not offered
2896
2897 It won't be a negative response or timeout after RCPT, as that is dealt
2898 with separately above. The action in all cases is to set an appropriate
2899 error code for all the addresses, but to leave yield set to OK because the
2900 host itself has not failed. Of course, it might in practice have failed
2901 when we've had a timeout, but if so, we'll discover that at the next
2902 delivery attempt. For a temporary error, set the message_defer flag, and
2903 write to the logs for information if this is not the last host. The error
2904 for the last host will be logged as part of the address's log line. */
2905
2906 if (message_error)
2907 {
2908 if (mua_wrapper) code = '5'; /* Force hard failure in wrapper mode */
2909
2910 /* If there's an errno, the message contains just the identity of
2911 the host. */
2912
2913 if (code == '5')
2914 set_rc = FAIL;
2915 else /* Anything other than 5 is treated as temporary */
2916 {
2917 set_rc = DEFER;
2918 if (save_errno > 0)
2919 message = US string_sprintf("%s: %s", message, strerror(save_errno));
2920 if (host->next != NULL) log_write(0, LOG_MAIN, "%s", message);
2921 msglog_line(host, message);
2922 *message_defer = TRUE;
2923 }
2924 }
2925
2926 /* Otherwise, we have an I/O error or a timeout other than after MAIL or
2927 ".", or some other transportation error. We defer all addresses and yield
2928 DEFER, except for the case of failed add_headers expansion, or a transport
2929 filter failure, when the yield should be ERROR, to stop it trying other
2930 hosts. */
2931
2932 else
2933 {
2934 set_rc = DEFER;
2935 yield = (save_errno == ERRNO_CHHEADER_FAIL ||
2936 save_errno == ERRNO_FILTER_FAIL)? ERROR : DEFER;
2937 }
2938 }
2939
2940 set_errno(addrlist, save_errno, set_message, set_rc, pass_message, host
2941 #ifdef EXPERIMENTAL_DSN_INFO
2942 , smtp_greeting, helo_response
2943 #endif
2944 );
2945 }
2946
2947
2948 /* If all has gone well, send_quit will be set TRUE, implying we can end the
2949 SMTP session tidily. However, if there were too many addresses to send in one
2950 message (indicated by first_addr being non-NULL) we want to carry on with the
2951 rest of them. Also, it is desirable to send more than one message down the SMTP
2952 connection if there are several waiting, provided we haven't already sent so
2953 many as to hit the configured limit. The function transport_check_waiting looks
2954 for a waiting message and returns its id. Then transport_pass_socket tries to
2955 set up a continued delivery by passing the socket on to another process. The
2956 variable send_rset is FALSE if a message has just been successfully transfered.
2957
2958 If we are already sending down a continued channel, there may be further
2959 addresses not yet delivered that are aimed at the same host, but which have not
2960 been passed in this run of the transport. In this case, continue_more will be
2961 true, and all we should do is send RSET if necessary, and return, leaving the
2962 channel open.
2963
2964 However, if no address was disposed of, i.e. all addresses got 4xx errors, we
2965 do not want to continue with other messages down the same channel, because that
2966 can lead to looping between two or more messages, all with the same,
2967 temporarily failing address(es). [The retry information isn't updated yet, so
2968 new processes keep on trying.] We probably also don't want to try more of this
2969 message's addresses either.
2970
2971 If we have started a TLS session, we have to end it before passing the
2972 connection to a new process. However, not all servers can handle this (Exim
2973 can), so we do not pass such a connection on if the host matches
2974 hosts_nopass_tls. */
2975
2976 DEBUG(D_transport)
2977 debug_printf("ok=%d send_quit=%d send_rset=%d continue_more=%d "
2978 "yield=%d first_address is %sNULL\n", ok, send_quit, send_rset,
2979 continue_more, yield, (first_addr == NULL)? "":"not ");
2980
2981 if (completed_address && ok && send_quit)
2982 {
2983 BOOL more;
2984 smtp_compare_t t_compare;
2985
2986 t_compare.tblock = tblock;
2987 t_compare.current_sender_address = sender_address;
2988
2989 if ( first_addr != NULL
2990 || continue_more
2991 || ( ( tls_out.active < 0
2992 || verify_check_given_host(&ob->hosts_nopass_tls, host) != OK
2993 )
2994 &&
2995 transport_check_waiting(tblock->name, host->name,
2996 tblock->connection_max_messages, new_message_id, &more,
2997 (oicf)smtp_are_same_identities, (void*)&t_compare)
2998 ) )
2999 {
3000 uschar *msg;
3001 BOOL pass_message;
3002
3003 if (send_rset)
3004 {
3005 if (! (ok = smtp_write_command(&outblock, FALSE, "RSET\r\n") >= 0))
3006 {
3007 msg = US string_sprintf("send() to %s [%s] failed: %s", host->name,
3008 host->address, strerror(save_errno));
3009 send_quit = FALSE;
3010 }
3011 else if (! (ok = smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
3012 ob->command_timeout)))
3013 {
3014 int code;
3015 send_quit = check_response(host, &errno, 0, buffer, &code, &msg,
3016 &pass_message);
3017 if (!send_quit)
3018 {
3019 DEBUG(D_transport) debug_printf("H=%s [%s] %s\n",
3020 host->name, host->address, msg);
3021 }
3022 }
3023 }
3024
3025 /* Either RSET was not needed, or it succeeded */
3026
3027 if (ok)
3028 {
3029 if (first_addr != NULL) /* More addresses still to be sent */
3030 { /* in this run of the transport */
3031 continue_sequence++; /* Causes * in logging */
3032 goto SEND_MESSAGE;
3033 }
3034 if (continue_more) return yield; /* More addresses for another run */
3035
3036 /* Pass the socket to a new Exim process. Before doing so, we must shut
3037 down TLS. Not all MTAs allow for the continuation of the SMTP session
3038 when TLS is shut down. We test for this by sending a new EHLO. If we
3039 don't get a good response, we don't attempt to pass the socket on. */
3040
3041 #ifdef SUPPORT_TLS
3042 if (tls_out.active >= 0)
3043 {
3044 tls_close(FALSE, TRUE);
3045 smtp_peer_options = smtp_peer_options_wrap;
3046 if (smtps)
3047 ok = FALSE;
3048 else
3049 ok = smtp_write_command(&outblock,FALSE,"EHLO %s\r\n",helo_data) >= 0 &&
3050 smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
3051 ob->command_timeout);
3052 }
3053 #endif
3054
3055 /* If the socket is successfully passed, we musn't send QUIT (or
3056 indeed anything!) from here. */
3057
3058 /*XXX DSN_INFO: assume likely to do new HELO; but for greet we'll want to
3059 propagate it from the initial
3060 */
3061 if (ok && transport_pass_socket(tblock->name, host->name, host->address,
3062 new_message_id, inblock.sock))
3063 {
3064 send_quit = FALSE;
3065 }
3066 }
3067
3068 /* If RSET failed and there are addresses left, they get deferred. */
3069
3070 else set_errno(first_addr, errno, msg, DEFER, FALSE, host
3071 #ifdef EXPERIMENTAL_DSN_INFO
3072 , smtp_greeting, helo_response
3073 #endif
3074 );
3075 }
3076 }
3077
3078 /* End off tidily with QUIT unless the connection has died or the socket has
3079 been passed to another process. There has been discussion on the net about what
3080 to do after sending QUIT. The wording of the RFC suggests that it is necessary
3081 to wait for a response, but on the other hand, there isn't anything one can do
3082 with an error response, other than log it. Exim used to do that. However,
3083 further discussion suggested that it is positively advantageous not to wait for
3084 the response, but to close the session immediately. This is supposed to move
3085 the TCP/IP TIME_WAIT state from the server to the client, thereby removing some
3086 load from the server. (Hosts that are both servers and clients may not see much
3087 difference, of course.) Further discussion indicated that this was safe to do
3088 on Unix systems which have decent implementations of TCP/IP that leave the
3089 connection around for a while (TIME_WAIT) after the application has gone away.
3090 This enables the response sent by the server to be properly ACKed rather than
3091 timed out, as can happen on broken TCP/IP implementations on other OS.
3092
3093 This change is being made on 31-Jul-98. After over a year of trouble-free
3094 operation, the old commented-out code was removed on 17-Sep-99. */
3095
3096 SEND_QUIT:
3097 if (send_quit) (void)smtp_write_command(&outblock, FALSE, "QUIT\r\n");
3098
3099 END_OFF:
3100
3101 #ifdef SUPPORT_TLS
3102 tls_close(FALSE, TRUE);
3103 #endif
3104
3105 /* Close the socket, and return the appropriate value, first setting
3106 works because the NULL setting is passed back to the calling process, and
3107 remote_max_parallel is forced to 1 when delivering over an existing connection,
3108
3109 If all went well and continue_more is set, we shouldn't actually get here if
3110 there are further addresses, as the return above will be taken. However,
3111 writing RSET might have failed, or there may be other addresses whose hosts are
3112 specified in the transports, and therefore not visible at top level, in which
3113 case continue_more won't get set. */
3114
3115 HDEBUG(D_transport|D_acl|D_v) debug_printf(" SMTP(close)>>\n");
3116 (void)close(inblock.sock);
3117
3118 #ifndef DISABLE_EVENT
3119 (void) event_raise(tblock->event_action, US"tcp:close", NULL);
3120 #endif
3121
3122 continue_transport = NULL;
3123 continue_hostname = NULL;
3124 return yield;
3125 }
3126
3127
3128
3129
3130 /*************************************************
3131 * Closedown entry point *
3132 *************************************************/
3133
3134 /* This function is called when exim is passed an open smtp channel
3135 from another incarnation, but the message which it has been asked
3136 to deliver no longer exists. The channel is on stdin.
3137
3138 We might do fancy things like looking for another message to send down
3139 the channel, but if the one we sought has gone, it has probably been
3140 delivered by some other process that itself will seek further messages,
3141 so just close down our connection.
3142
3143 Argument: pointer to the transport instance block
3144 Returns: nothing
3145 */
3146
3147 void
3148 smtp_transport_closedown(transport_instance *tblock)
3149 {
3150 smtp_transport_options_block *ob =
3151 (smtp_transport_options_block *)(tblock->options_block);
3152 smtp_inblock inblock;
3153 smtp_outblock outblock;
3154 uschar buffer[256];
3155 uschar inbuffer[4096];
3156 uschar outbuffer[16];
3157
3158 inblock.sock = fileno(stdin);
3159 inblock.buffer = inbuffer;
3160 inblock.buffersize = sizeof(inbuffer);
3161 inblock.ptr = inbuffer;
3162 inblock.ptrend = inbuffer;
3163
3164 outblock.sock = inblock.sock;
3165 outblock.buffersize = sizeof(outbuffer);
3166 outblock.buffer = outbuffer;
3167 outblock.ptr = outbuffer;
3168 outblock.cmd_count = 0;
3169 outblock.authenticating = FALSE;
3170
3171 (void)smtp_write_command(&outblock, FALSE, "QUIT\r\n");
3172 (void)smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
3173 ob->command_timeout);
3174 (void)close(inblock.sock);
3175 }
3176
3177
3178
3179 /*************************************************
3180 * Prepare addresses for delivery *
3181 *************************************************/
3182
3183 /* This function is called to flush out error settings from previous delivery
3184 attempts to other hosts. It also records whether we got here via an MX record
3185 or not in the more_errno field of the address. We are interested only in
3186 addresses that are still marked DEFER - others may have got delivered to a
3187 previously considered IP address. Set their status to PENDING_DEFER to indicate
3188 which ones are relevant this time.
3189
3190 Arguments:
3191 addrlist the list of addresses
3192 host the host we are delivering to
3193
3194 Returns: the first address for this delivery
3195 */
3196
3197 static address_item *
3198 prepare_addresses(address_item *addrlist, host_item *host)
3199 {
3200 address_item *first_addr = NULL;
3201 address_item *addr;
3202 for (addr = addrlist; addr != NULL; addr = addr->next)
3203 if (addr->transport_return == DEFER)
3204 {
3205 if (first_addr == NULL) first_addr = addr;
3206 addr->transport_return = PENDING_DEFER;
3207 addr->basic_errno = 0;
3208 addr->more_errno = (host->mx >= 0)? 'M' : 'A';
3209 addr->message = NULL;
3210 #ifdef SUPPORT_TLS
3211 addr->cipher = NULL;
3212 addr->ourcert = NULL;
3213 addr->peercert = NULL;
3214 addr->peerdn = NULL;
3215 addr->ocsp = OCSP_NOT_REQ;
3216 #endif
3217 #ifdef EXPERIMENTAL_DSN_INFO
3218 addr->smtp_greeting = NULL;
3219 addr->helo_response = NULL;
3220 #endif
3221 }
3222 return first_addr;
3223 }
3224
3225
3226
3227 /*************************************************
3228 * Main entry point *
3229 *************************************************/
3230
3231 /* See local README for interface details. As this is a remote transport, it is
3232 given a chain of addresses to be delivered in one connection, if possible. It
3233 always returns TRUE, indicating that each address has its own independent
3234 status set, except if there is a setting up problem, in which case it returns
3235 FALSE. */
3236
3237 BOOL
3238 smtp_transport_entry(
3239 transport_instance *tblock, /* data for this instantiation */
3240 address_item *addrlist) /* addresses we are working on */
3241 {
3242 int cutoff_retry;
3243 int port;
3244 int hosts_defer = 0;
3245 int hosts_fail = 0;
3246 int hosts_looked_up = 0;
3247 int hosts_retry = 0;
3248 int hosts_serial = 0;
3249 int hosts_total = 0;
3250 int total_hosts_tried = 0;
3251 address_item *addr;
3252 BOOL expired = TRUE;
3253 BOOL continuing = continue_hostname != NULL;
3254 uschar *expanded_hosts = NULL;
3255 uschar *pistring;
3256 uschar *tid = string_sprintf("%s transport", tblock->name);
3257 smtp_transport_options_block *ob =
3258 (smtp_transport_options_block *)(tblock->options_block);
3259 host_item *hostlist = addrlist->host_list;
3260 host_item *host = NULL;
3261
3262 DEBUG(D_transport)
3263 {
3264 debug_printf("%s transport entered\n", tblock->name);
3265 for (addr = addrlist; addr != NULL; addr = addr->next)
3266 debug_printf(" %s\n", addr->address);
3267 if (continuing) debug_printf("already connected to %s [%s]\n",
3268 continue_hostname, continue_host_address);
3269 }
3270
3271 /* Set the flag requesting that these hosts be added to the waiting
3272 database if the delivery fails temporarily or if we are running with
3273 queue_smtp or a 2-stage queue run. This gets unset for certain
3274 kinds of error, typically those that are specific to the message. */
3275
3276 update_waiting = TRUE;
3277
3278 /* If a host list is not defined for the addresses - they must all have the
3279 same one in order to be passed to a single transport - or if the transport has
3280 a host list with hosts_override set, use the host list supplied with the
3281 transport. It is an error for this not to exist. */
3282
3283 if (hostlist == NULL || (ob->hosts_override && ob->hosts != NULL))
3284 {
3285 if (ob->hosts == NULL)
3286 {
3287 addrlist->message = string_sprintf("%s transport called with no hosts set",
3288 tblock->name);
3289 addrlist->transport_return = PANIC;
3290 return FALSE; /* Only top address has status */
3291 }
3292
3293 DEBUG(D_transport) debug_printf("using the transport's hosts: %s\n",
3294 ob->hosts);
3295
3296 /* If the transport's host list contains no '$' characters, and we are not
3297 randomizing, it is fixed and therefore a chain of hosts can be built once
3298 and for all, and remembered for subsequent use by other calls to this
3299 transport. If, on the other hand, the host list does contain '$', or we are
3300 randomizing its order, we have to rebuild it each time. In the fixed case,
3301 as the hosts string will never be used again, it doesn't matter that we
3302 replace all the : characters with zeros. */
3303
3304 if (ob->hostlist == NULL)
3305 {
3306 uschar *s = ob->hosts;
3307
3308 if (Ustrchr(s, '$') != NULL)
3309 {
3310 if (!(expanded_hosts = expand_string(s)))
3311 {
3312 addrlist->message = string_sprintf("failed to expand list of hosts "
3313 "\"%s\" in %s transport: %s", s, tblock->name, expand_string_message);
3314 addrlist->transport_return = search_find_defer? DEFER : PANIC;
3315 return FALSE; /* Only top address has status */
3316 }
3317 DEBUG(D_transport) debug_printf("expanded list of hosts \"%s\" to "
3318 "\"%s\"\n", s, expanded_hosts);
3319 s = expanded_hosts;
3320 }
3321 else
3322 if (ob->hosts_randomize) s = expanded_hosts = string_copy(s);
3323
3324 host_build_hostlist(&hostlist, s, ob->hosts_randomize);
3325
3326 /* Check that the expansion yielded something useful. */
3327 if (hostlist == NULL)
3328 {
3329 addrlist->message =
3330 string_sprintf("%s transport has empty hosts setting", tblock->name);
3331 addrlist->transport_return = PANIC;
3332 return FALSE; /* Only top address has status */
3333 }
3334
3335 /* If there was no expansion of hosts, save the host list for
3336 next time. */
3337
3338 if (!expanded_hosts) ob->hostlist = hostlist;
3339 }
3340
3341 /* This is not the first time this transport has been run in this delivery;
3342 the host list was built previously. */
3343
3344 else
3345 hostlist = ob->hostlist;
3346 }
3347
3348 /* The host list was supplied with the address. If hosts_randomize is set, we
3349 must sort it into a random order if it did not come from MX records and has not
3350 already been randomized (but don't bother if continuing down an existing
3351 connection). */
3352
3353 else if (ob->hosts_randomize && hostlist->mx == MX_NONE && !continuing)
3354 {
3355 host_item *newlist = NULL;
3356 while (hostlist != NULL)
3357 {
3358 host_item *h = hostlist;
3359 hostlist = hostlist->next;
3360
3361 h->sort_key = random_number(100);
3362
3363 if (newlist == NULL)
3364 {
3365 h->next = NULL;
3366 newlist = h;
3367 }
3368 else if (h->sort_key < newlist->sort_key)
3369 {
3370 h->next = newlist;
3371 newlist = h;
3372 }
3373 else
3374 {
3375 host_item *hh = newlist;
3376 while (hh->next != NULL)
3377 {
3378 if (h->sort_key < hh->next->sort_key) break;
3379 hh = hh->next;
3380 }
3381 h->next = hh->next;
3382 hh->next = h;
3383 }
3384 }
3385
3386 hostlist = addrlist->host_list = newlist;
3387 }
3388
3389 /* Sort out the default port. */
3390
3391 if (!smtp_get_port(ob->port, addrlist, &port, tid)) return FALSE;
3392
3393 /* For each host-plus-IP-address on the list:
3394
3395 . If this is a continued delivery and the host isn't the one with the
3396 current connection, skip.
3397
3398 . If the status is unusable (i.e. previously failed or retry checked), skip.
3399
3400 . If no IP address set, get the address, either by turning the name into
3401 an address, calling gethostbyname if gethostbyname is on, or by calling
3402 the DNS. The DNS may yield multiple addresses, in which case insert the
3403 extra ones into the list.
3404
3405 . Get the retry data if not previously obtained for this address and set the
3406 field which remembers the state of this address. Skip if the retry time is
3407 not reached. If not, remember whether retry data was found. The retry string
3408 contains both the name and the IP address.
3409
3410 . Scan the list of addresses and mark those whose status is DEFER as
3411 PENDING_DEFER. These are the only ones that will be processed in this cycle
3412 of the hosts loop.
3413
3414 . Make a delivery attempt - addresses marked PENDING_DEFER will be tried.
3415 Some addresses may be successfully delivered, others may fail, and yet
3416 others may get temporary errors and so get marked DEFER.
3417
3418 . The return from the delivery attempt is OK if a connection was made and a
3419 valid SMTP dialogue was completed. Otherwise it is DEFER.
3420
3421 . If OK, add a "remove" retry item for this host/IPaddress, if any.
3422
3423 . If fail to connect, or other defer state, add a retry item.
3424
3425 . If there are any addresses whose status is still DEFER, carry on to the
3426 next host/IPaddress, unless we have tried the number of hosts given
3427 by hosts_max_try or hosts_max_try_hardlimit; otherwise return. Note that
3428 there is some fancy logic for hosts_max_try that means its limit can be
3429 overstepped in some circumstances.
3430
3431 If we get to the end of the list, all hosts have deferred at least one address,
3432 or not reached their retry times. If delay_after_cutoff is unset, it requests a
3433 delivery attempt to those hosts whose last try was before the arrival time of
3434 the current message. To cope with this, we have to go round the loop a second
3435 time. After that, set the status and error data for any addresses that haven't
3436 had it set already. */
3437
3438 for (cutoff_retry = 0; expired &&
3439 cutoff_retry < ((ob->delay_after_cutoff)? 1 : 2);
3440 cutoff_retry++)
3441 {
3442 host_item *nexthost = NULL;
3443 int unexpired_hosts_tried = 0;
3444
3445 for (host = hostlist;
3446 host != NULL &&
3447 unexpired_hosts_tried < ob->hosts_max_try &&
3448 total_hosts_tried < ob->hosts_max_try_hardlimit;
3449 host = nexthost)
3450 {
3451 int rc;
3452 int host_af;
3453 uschar *rs;
3454 BOOL serialized = FALSE;
3455 BOOL host_is_expired = FALSE;
3456 BOOL message_defer = FALSE;
3457 BOOL some_deferred = FALSE;
3458 address_item *first_addr = NULL;
3459 uschar *interface = NULL;
3460 uschar *retry_host_key = NULL;
3461 uschar *retry_message_key = NULL;
3462 uschar *serialize_key = NULL;
3463
3464 /* Default next host is next host. :-) But this can vary if the
3465 hosts_max_try limit is hit (see below). It may also be reset if a host
3466 address is looked up here (in case the host was multihomed). */
3467
3468 nexthost = host->next;
3469
3470 /* If the address hasn't yet been obtained from the host name, look it up
3471 now, unless the host is already marked as unusable. If it is marked as
3472 unusable, it means that the router was unable to find its IP address (in
3473 the DNS or wherever) OR we are in the 2nd time round the cutoff loop, and
3474 the lookup failed last time. We don't get this far if *all* MX records
3475 point to non-existent hosts; that is treated as a hard error.
3476
3477 We can just skip this host entirely. When the hosts came from the router,
3478 the address will timeout based on the other host(s); when the address is
3479 looked up below, there is an explicit retry record added.
3480
3481 Note that we mustn't skip unusable hosts if the address is not unset; they
3482 may be needed as expired hosts on the 2nd time round the cutoff loop. */
3483
3484 if (host->address == NULL)
3485 {
3486 int new_port, flags;
3487 host_item *hh;
3488
3489 if (host->status >= hstatus_unusable)
3490 {
3491 DEBUG(D_transport) debug_printf("%s has no address and is unusable - skipping\n",
3492 host->name);
3493 continue;
3494 }
3495
3496 DEBUG(D_transport) debug_printf("getting address for %s\n", host->name);
3497
3498 /* The host name is permitted to have an attached port. Find it, and
3499 strip it from the name. Just remember it for now. */
3500
3501 new_port = host_item_get_port(host);
3502
3503 /* Count hosts looked up */
3504
3505 hosts_looked_up++;
3506
3507 /* Find by name if so configured, or if it's an IP address. We don't
3508 just copy the IP address, because we need the test-for-local to happen. */
3509
3510 flags = HOST_FIND_BY_A;
3511 if (ob->dns_qualify_single) flags |= HOST_FIND_QUALIFY_SINGLE;
3512 if (ob->dns_search_parents) flags |= HOST_FIND_SEARCH_PARENTS;
3513
3514 if (ob->gethostbyname || string_is_ip_address(host->name, NULL) != 0)
3515 rc = host_find_byname(host, NULL, flags, NULL, TRUE);
3516 else
3517 rc = host_find_bydns(host, NULL, flags, NULL, NULL, NULL,
3518 &ob->dnssec, /* domains for request/require */
3519 NULL, NULL);
3520
3521 /* Update the host (and any additional blocks, resulting from
3522 multihoming) with a host-specific port, if any. */
3523
3524 for (hh = host; hh != nexthost; hh = hh->next) hh->port = new_port;
3525
3526 /* Failure to find the host at this time (usually DNS temporary failure)
3527 is really a kind of routing failure rather than a transport failure.
3528 Therefore we add a retry item of the routing kind, not to stop us trying
3529 to look this name up here again, but to ensure the address gets timed
3530 out if the failures go on long enough. A complete failure at this point
3531 commonly points to a configuration error, but the best action is still
3532 to carry on for the next host. */
3533
3534 if (rc == HOST_FIND_AGAIN || rc == HOST_FIND_FAILED)
3535 {
3536 retry_add_item(addrlist, string_sprintf("R:%s", host->name), 0);
3537 expired = FALSE;
3538 if (rc == HOST_FIND_AGAIN) hosts_defer++; else hosts_fail++;
3539 DEBUG(D_transport) debug_printf("rc = %s for %s\n", (rc == HOST_FIND_AGAIN)?
3540 "HOST_FIND_AGAIN" : "HOST_FIND_FAILED", host->name);
3541 host->status = hstatus_unusable;
3542
3543 for (addr = addrlist; addr != NULL; addr = addr->next)
3544 {
3545 if (addr->transport_return != DEFER) continue;
3546 addr->basic_errno = ERRNO_UNKNOWNHOST;
3547 addr->message =
3548 string_sprintf("failed to lookup IP address for %s", host->name);
3549 }
3550 continue;
3551 }
3552
3553 /* If the host is actually the local host, we may have a problem, or
3554 there may be some cunning configuration going on. In the problem case,
3555 log things and give up. The default transport status is already DEFER. */
3556
3557 if (rc == HOST_FOUND_LOCAL && !ob->allow_localhost)
3558 {
3559 for (addr = addrlist; addr != NULL; addr = addr->next)
3560 {
3561 addr->basic_errno = 0;
3562 addr->message = string_sprintf("%s transport found host %s to be "
3563 "local", tblock->name, host->name);
3564 }
3565 goto END_TRANSPORT;
3566 }
3567 } /* End of block for IP address lookup */
3568
3569 /* If this is a continued delivery, we are interested only in the host
3570 which matches the name of the existing open channel. The check is put
3571 here after the local host lookup, in case the name gets expanded as a
3572 result of the lookup. Set expired FALSE, to save the outer loop executing
3573 twice. */
3574
3575 if (continuing && (Ustrcmp(continue_hostname, host->name) != 0 ||
3576 Ustrcmp(continue_host_address, host->address) != 0))
3577 {
3578 expired = FALSE;
3579 continue; /* With next host */
3580 }
3581
3582 /* Reset the default next host in case a multihomed host whose addresses
3583 are not looked up till just above added to the host list. */
3584
3585 nexthost = host->next;
3586
3587 /* If queue_smtp is set (-odqs or the first part of a 2-stage run), or the
3588 domain is in queue_smtp_domains, we don't actually want to attempt any
3589 deliveries. When doing a queue run, queue_smtp_domains is always unset. If
3590 there is a lookup defer in queue_smtp_domains, proceed as if the domain
3591 were not in it. We don't want to hold up all SMTP deliveries! Except when
3592 doing a two-stage queue run, don't do this if forcing. */
3593
3594 if ((!deliver_force || queue_2stage) && (queue_smtp ||
3595 match_isinlist(addrlist->domain,
3596 (const uschar **)&queue_smtp_domains, 0,
3597 &domainlist_anchor, NULL, MCL_DOMAIN, TRUE, NULL) == OK))
3598 {
3599 expired = FALSE;
3600 for (addr = addrlist; addr != NULL; addr = addr->next)
3601 {
3602 if (addr->transport_return != DEFER) continue;
3603 addr->message = US"domain matches queue_smtp_domains, or -odqs set";
3604 }
3605 continue; /* With next host */
3606 }
3607
3608 /* Count hosts being considered - purely for an intelligent comment
3609 if none are usable. */
3610
3611 hosts_total++;
3612
3613 /* Set $host and $host address now in case they are needed for the
3614 interface expansion or the serialize_hosts check; they remain set if an
3615 actual delivery happens. */
3616
3617 deliver_host = host->name;
3618 deliver_host_address = host->address;
3619 lookup_dnssec_authenticated = host->dnssec == DS_YES ? US"yes"
3620 : host->dnssec == DS_NO ? US"no"
3621 : US"";
3622
3623 /* Set up a string for adding to the retry key if the port number is not
3624 the standard SMTP port. A host may have its own port setting that overrides
3625 the default. */
3626
3627 pistring = string_sprintf(":%d", (host->port == PORT_NONE)?
3628 port : host->port);
3629 if (Ustrcmp(pistring, ":25") == 0) pistring = US"";
3630
3631 /* Select IPv4 or IPv6, and choose an outgoing interface. If the interface
3632 string is set, even if constant (as different transports can have different
3633 constant settings), we must add it to the key that is used for retries,
3634 because connections to the same host from a different interface should be
3635 treated separately. */
3636
3637 host_af = (Ustrchr(host->address, ':') == NULL)? AF_INET : AF_INET6;
3638 if ((rs = ob->interface) && *rs)
3639 {
3640 if (!smtp_get_interface(rs, host_af, addrlist, &interface, tid))
3641 return FALSE;
3642 pistring = string_sprintf("%s/%s", pistring, interface);
3643 }
3644
3645 /* The first time round the outer loop, check the status of the host by
3646 inspecting the retry data. The second time round, we are interested only
3647 in expired hosts that haven't been tried since this message arrived. */
3648
3649 if (cutoff_retry == 0)
3650 {
3651 BOOL incl_ip;
3652 /* Ensure the status of the address is set by checking retry data if
3653 necessary. There may be host-specific retry data (applicable to all
3654 messages) and also data for retries of a specific message at this host.
3655 If either of these retry records are actually read, the keys used are
3656 returned to save recomputing them later. */
3657
3658 if (exp_bool(addrlist, US"transport", tblock->name, D_transport,
3659 US"retry_include_ip_address", ob->retry_include_ip_address,
3660 ob->expand_retry_include_ip_address, &incl_ip) != OK)
3661 continue; /* with next host */
3662
3663 host_is_expired = retry_check_address(addrlist->domain, host, pistring,
3664 incl_ip, &retry_host_key, &retry_message_key);
3665
3666 DEBUG(D_transport) debug_printf("%s [%s]%s status = %s\n", host->name,
3667 (host->address == NULL)? US"" : host->address, pistring,
3668 (host->status == hstatus_usable)? "usable" :
3669 (host->status == hstatus_unusable)? "unusable" :
3670 (host->status == hstatus_unusable_expired)? "unusable (expired)" : "?");
3671
3672 /* Skip this address if not usable at this time, noting if it wasn't
3673 actually expired, both locally and in the address. */
3674
3675 switch (host->status)
3676 {
3677 case hstatus_unusable:
3678 expired = FALSE;
3679 setflag(addrlist, af_retry_skipped);
3680 /* Fall through */
3681
3682 case hstatus_unusable_expired:
3683 switch (host->why)
3684 {
3685 case hwhy_retry: hosts_retry++; break;
3686 case hwhy_failed: hosts_fail++; break;
3687 case hwhy_deferred: hosts_defer++; break;
3688 }
3689
3690 /* If there was a retry message key, implying that previously there
3691 was a message-specific defer, we don't want to update the list of
3692 messages waiting for these hosts. */
3693
3694 if (retry_message_key != NULL) update_waiting = FALSE;
3695 continue; /* With the next host or IP address */
3696 }
3697 }
3698
3699 /* Second time round the loop: if the address is set but expired, and
3700 the message is newer than the last try, let it through. */
3701
3702 else
3703 {
3704 if (host->address == NULL ||
3705 host->status != hstatus_unusable_expired ||
3706 host->last_try > received_time)
3707 continue;
3708 DEBUG(D_transport)
3709 debug_printf("trying expired host %s [%s]%s\n",
3710 host->name, host->address, pistring);
3711 host_is_expired = TRUE;
3712 }
3713
3714 /* Setting "expired=FALSE" doesn't actually mean not all hosts are expired;
3715 it remains TRUE only if all hosts are expired and none are actually tried.
3716 */
3717
3718 expired = FALSE;
3719
3720 /* If this host is listed as one to which access must be serialized,
3721 see if another Exim process has a connection to it, and if so, skip
3722 this host. If not, update the database to record our connection to it
3723 and remember this for later deletion. Do not do any of this if we are
3724 sending the message down a pre-existing connection. */
3725
3726 if (!continuing &&
3727 verify_check_given_host(&ob->serialize_hosts, host) == OK)
3728 {
3729 serialize_key = string_sprintf("host-serialize-%s", host->name);
3730 if (!enq_start(serialize_key, 1))
3731 {
3732 DEBUG(D_transport)
3733 debug_printf("skipping host %s because another Exim process "
3734 "is connected to it\n", host->name);
3735 hosts_serial++;
3736 continue;
3737 }
3738 serialized = TRUE;
3739 }
3740
3741 /* OK, we have an IP address that is not waiting for its retry time to
3742 arrive (it might be expired) OR (second time round the loop) we have an
3743 expired host that hasn't been tried since the message arrived. Have a go
3744 at delivering the message to it. First prepare the addresses by flushing
3745 out the result of previous attempts, and finding the first address that
3746 is still to be delivered. */
3747
3748 first_addr = prepare_addresses(addrlist, host);
3749
3750 DEBUG(D_transport) debug_printf("delivering %s to %s [%s] (%s%s)\n",
3751 message_id, host->name, host->address, addrlist->address,
3752 (addrlist->next == NULL)? "" : ", ...");
3753
3754 set_process_info("delivering %s to %s [%s] (%s%s)",
3755 message_id, host->name, host->address, addrlist->address,
3756 (addrlist->next == NULL)? "" : ", ...");
3757
3758 /* This is not for real; don't do the delivery. If there are
3759 any remaining hosts, list them. */
3760
3761 if (dont_deliver)
3762 {
3763 host_item *host2;
3764 set_errno_nohost(addrlist, 0, NULL, OK, FALSE);
3765 for (addr = addrlist; addr != NULL; addr = addr->next)
3766 {
3767 addr->host_used = host;
3768 addr->special_action = '*';
3769 addr->message = US"delivery bypassed by -N option";
3770 }
3771 DEBUG(D_transport)
3772 {
3773 debug_printf("*** delivery by %s transport bypassed by -N option\n"
3774 "*** host and remaining hosts:\n", tblock->name);
3775 for (host2 = host; host2 != NULL; host2 = host2->next)
3776 debug_printf(" %s [%s]\n", host2->name,
3777 (host2->address == NULL)? US"unset" : host2->address);
3778 }
3779 rc = OK;
3780 }
3781
3782 /* This is for real. If the host is expired, we don't count it for
3783 hosts_max_retry. This ensures that all hosts must expire before an address
3784 is timed out, unless hosts_max_try_hardlimit (which protects against
3785 lunatic DNS configurations) is reached.
3786
3787 If the host is not expired and we are about to hit the hosts_max_retry
3788 limit, check to see if there is a subsequent hosts with a different MX
3789 value. If so, make that the next host, and don't count this one. This is a
3790 heuristic to make sure that different MXs do get tried. With a normal kind
3791 of retry rule, they would get tried anyway when the earlier hosts were
3792 delayed, but if the domain has a "retry every time" type of rule - as is
3793 often used for the the very large ISPs, that won't happen. */
3794
3795 else
3796 {
3797 host_item * thost;
3798 /* Make a copy of the host if it is local to this invocation
3799 of the transport. */
3800
3801 if (expanded_hosts)
3802 {
3803 thost = store_get(sizeof(host_item));
3804 *thost = *host;
3805 thost->name = string_copy(host->name);
3806 thost->address = string_copy(host->address);
3807 }
3808 else
3809 thost = host;
3810
3811 if (!host_is_expired && ++unexpired_hosts_tried >= ob->hosts_max_try)
3812 {
3813 host_item *h;
3814 DEBUG(D_transport)
3815 debug_printf("hosts_max_try limit reached with this host\n");
3816 for (h = host; h; h = h->next) if (h->mx != host->mx)
3817 {
3818 nexthost = h;
3819 unexpired_hosts_tried--;
3820 DEBUG(D_transport) debug_printf("however, a higher MX host exists "
3821 "and will be tried\n");
3822 break;
3823 }
3824 }
3825
3826 /* Attempt the delivery. */
3827
3828 total_hosts_tried++;
3829 rc = smtp_deliver(addrlist, thost, host_af, port, interface, tblock,
3830 &message_defer, FALSE);
3831
3832 /* Yield is one of:
3833 OK => connection made, each address contains its result;
3834 message_defer is set for message-specific defers (when all
3835 recipients are marked defer)
3836 DEFER => there was a non-message-specific delivery problem;
3837 ERROR => there was a problem setting up the arguments for a filter,
3838 or there was a problem with expanding added headers
3839 */
3840
3841 /* If the result is not OK, there was a non-message-specific problem.
3842 If the result is DEFER, we need to write to the logs saying what happened
3843 for this particular host, except in the case of authentication and TLS
3844 failures, where the log has already been written. If all hosts defer a
3845 general message is written at the end. */
3846
3847 if (rc == DEFER && first_addr->basic_errno != ERRNO_AUTHFAIL &&
3848 first_addr->basic_errno != ERRNO_TLSFAILURE)
3849 write_logs(first_addr, host);
3850
3851 #ifndef DISABLE_EVENT
3852 if (rc == DEFER)
3853 deferred_event_raise(first_addr, host);
3854 #endif
3855
3856 /* If STARTTLS was accepted, but there was a failure in setting up the
3857 TLS session (usually a certificate screwup), and the host is not in
3858 hosts_require_tls, and tls_tempfail_tryclear is true, try again, with
3859 TLS forcibly turned off. We have to start from scratch with a new SMTP
3860 connection. That's why the retry is done from here, not from within
3861 smtp_deliver(). [Rejections of STARTTLS itself don't screw up the
3862 session, so the in-clear transmission after those errors, if permitted,
3863 happens inside smtp_deliver().] */
3864
3865 #ifdef SUPPORT_TLS
3866 if ( rc == DEFER
3867 && first_addr->basic_errno == ERRNO_TLSFAILURE
3868 && ob->tls_tempfail_tryclear
3869 && verify_check_given_host(&ob->hosts_require_tls, host) != OK
3870 )
3871 {
3872 log_write(0, LOG_MAIN, "TLS session failure: delivering unencrypted "
3873 "to %s [%s] (not in hosts_require_tls)", host->name, host->address);
3874 first_addr = prepare_addresses(addrlist, host);
3875 rc = smtp_deliver(addrlist, thost, host_af, port, interface, tblock,
3876 &message_defer, TRUE);
3877 if (rc == DEFER && first_addr->basic_errno != ERRNO_AUTHFAIL)
3878 write_logs(first_addr, host);
3879 # ifndef DISABLE_EVENT
3880 if (rc == DEFER)
3881 deferred_event_raise(first_addr, host);
3882 # endif
3883 }
3884 #endif /*SUPPORT_TLS*/
3885 }
3886
3887 /* Delivery attempt finished */
3888
3889 rs = (rc == OK)? US"OK" : (rc == DEFER)? US"DEFER" : (rc == ERROR)?
3890 US"ERROR" : US"?";
3891
3892 set_process_info("delivering %s: just tried %s [%s] for %s%s: result %s",
3893 message_id, host->name, host->address, addrlist->address,
3894 (addrlist->next == NULL)? "" : " (& others)", rs);
3895
3896 /* Release serialization if set up */
3897
3898 if (serialized) enq_end(serialize_key);
3899
3900 /* If the result is DEFER, or if a host retry record is known to exist, we
3901 need to add an item to the retry chain for updating the retry database
3902 at the end of delivery. We only need to add the item to the top address,
3903 of course. Also, if DEFER, we mark the IP address unusable so as to skip it
3904 for any other delivery attempts using the same address. (It is copied into
3905 the unusable tree at the outer level, so even if different address blocks
3906 contain the same address, it still won't get tried again.) */
3907
3908 if (rc == DEFER || retry_host_key != NULL)
3909 {
3910 int delete_flag = (rc != DEFER)? rf_delete : 0;
3911 if (retry_host_key == NULL)
3912 {
3913 BOOL incl_ip;
3914 if (exp_bool(addrlist, US"transport", tblock->name, D_transport,
3915 US"retry_include_ip_address", ob->retry_include_ip_address,
3916 ob->expand_retry_include_ip_address, &incl_ip) != OK)
3917 incl_ip = TRUE; /* error; use most-specific retry record */
3918
3919 retry_host_key = incl_ip ?
3920 string_sprintf("T:%S:%s%s", host->name, host->address, pistring) :
3921 string_sprintf("T:%S%s", host->name, pistring);
3922 }
3923
3924 /* If a delivery of another message over an existing SMTP connection
3925 yields DEFER, we do NOT set up retry data for the host. This covers the
3926 case when there are delays in routing the addresses in the second message
3927 that are so long that the server times out. This is alleviated by not
3928 routing addresses that previously had routing defers when handling an
3929 existing connection, but even so, this case may occur (e.g. if a
3930 previously happily routed address starts giving routing defers). If the
3931 host is genuinely down, another non-continued message delivery will
3932 notice it soon enough. */
3933
3934 if (delete_flag != 0 || !continuing)
3935 retry_add_item(first_addr, retry_host_key, rf_host | delete_flag);
3936
3937 /* We may have tried an expired host, if its retry time has come; ensure
3938 the status reflects the expiry for the benefit of any other addresses. */
3939
3940 if (rc == DEFER)
3941 {
3942 host->status = (host_is_expired)?
3943 hstatus_unusable_expired : hstatus_unusable;
3944 host->why = hwhy_deferred;
3945 }
3946 }
3947
3948 /* If message_defer is set (host was OK, but every recipient got deferred
3949 because of some message-specific problem), or if that had happened
3950 previously so that a message retry key exists, add an appropriate item
3951 to the retry chain. Note that if there was a message defer but now there is
3952 a host defer, the message defer record gets deleted. That seems perfectly
3953 reasonable. Also, stop the message from being remembered as waiting
3954 for specific hosts. */
3955
3956 if (message_defer || retry_message_key != NULL)
3957 {
3958 int delete_flag = message_defer? 0 : rf_delete;
3959 if (retry_message_key == NULL)
3960 {
3961 BOOL incl_ip;
3962 if (exp_bool(addrlist, US"transport", tblock->name, D_transport,
3963 US"retry_include_ip_address", ob->retry_include_ip_address,
3964 ob->expand_retry_include_ip_address, &incl_ip) != OK)
3965 incl_ip = TRUE; /* error; use most-specific retry record */
3966
3967 retry_message_key = incl_ip ?
3968 string_sprintf("T:%S:%s%s:%s", host->name, host->address, pistring,
3969 message_id) :
3970 string_sprintf("T:%S%s:%s", host->name, pistring, message_id);
3971 }
3972 retry_add_item(addrlist, retry_message_key,
3973 rf_message | rf_host | delete_flag);
3974 update_waiting = FALSE;
3975 }
3976
3977 /* Any return other than DEFER (that is, OK or ERROR) means that the
3978 addresses have got their final statuses filled in for this host. In the OK
3979 case, see if any of them are deferred. */
3980
3981 if (rc == OK)
3982 for (addr = addrlist; addr; addr = addr->next)
3983 if (addr->transport_return == DEFER)
3984 {
3985 some_deferred = TRUE;
3986 break;
3987 }
3988
3989 /* If no addresses deferred or the result was ERROR, return. We do this for
3990 ERROR because a failing filter set-up or add_headers expansion is likely to
3991 fail for any host we try. */
3992
3993 if (rc == ERROR || (rc == OK && !some_deferred))
3994 {
3995 DEBUG(D_transport) debug_printf("Leaving %s transport\n", tblock->name);
3996 return TRUE; /* Each address has its status */
3997 }
3998
3999 /* If the result was DEFER or some individual addresses deferred, let
4000 the loop run to try other hosts with the deferred addresses, except for the
4001 case when we were trying to deliver down an existing channel and failed.
4002 Don't try any other hosts in this case. */
4003
4004 if (continuing) break;
4005
4006 /* If the whole delivery, or some individual addresses, were deferred and
4007 there are more hosts that could be tried, do not count this host towards
4008 the hosts_max_try limit if the age of the message is greater than the
4009 maximum retry time for this host. This means we may try try all hosts,
4010 ignoring the limit, when messages have been around for some time. This is
4011 important because if we don't try all hosts, the address will never time
4012 out. NOTE: this does not apply to hosts_max_try_hardlimit. */
4013
4014 if ((rc == DEFER || some_deferred) && nexthost != NULL)
4015 {
4016 BOOL timedout;
4017 retry_config *retry = retry_find_config(host->name, NULL, 0, 0);
4018
4019 if (retry != NULL && retry->rules != NULL)
4020 {
4021 retry_rule *last_rule;
4022 for (last_rule = retry->rules;
4023 last_rule->next != NULL;
4024 last_rule = last_rule->next);
4025 timedout = time(NULL) - received_time > last_rule->timeout;
4026 }
4027 else timedout = TRUE; /* No rule => timed out */
4028
4029 if (timedout)
4030 {
4031 unexpired_hosts_tried--;
4032 DEBUG(D_transport) debug_printf("temporary delivery error(s) override "
4033 "hosts_max_try (message older than host's retry time)\n");
4034 }
4035 }
4036 } /* End of loop for trying multiple hosts. */
4037
4038 /* This is the end of the loop that repeats iff expired is TRUE and
4039 ob->delay_after_cutoff is FALSE. The second time round we will
4040 try those hosts that haven't been tried since the message arrived. */
4041
4042 DEBUG(D_transport)
4043 {
4044 debug_printf("all IP addresses skipped or deferred at least one address\n");
4045 if (expired && !ob->delay_after_cutoff && cutoff_retry == 0)
4046 debug_printf("retrying IP addresses not tried since message arrived\n");
4047 }
4048 }
4049
4050
4051 /* Get here if all IP addresses are skipped or defer at least one address. In
4052 MUA wrapper mode, this will happen only for connection or other non-message-
4053 specific failures. Force the delivery status for all addresses to FAIL. */
4054
4055 if (mua_wrapper)
4056 {
4057 for (addr = addrlist; addr != NULL; addr = addr->next)
4058 addr->transport_return = FAIL;
4059 goto END_TRANSPORT;
4060 }
4061
4062 /* In the normal, non-wrapper case, add a standard message to each deferred
4063 address if there hasn't been an error, that is, if it hasn't actually been
4064 tried this time. The variable "expired" will be FALSE if any deliveries were
4065 actually tried, or if there was at least one host that was not expired. That
4066 is, it is TRUE only if no deliveries were tried and all hosts were expired. If
4067 a delivery has been tried, an error code will be set, and the failing of the
4068 message is handled by the retry code later.
4069
4070 If queue_smtp is set, or this transport was called to send a subsequent message
4071 down an existing TCP/IP connection, and something caused the host not to be
4072 found, we end up here, but can detect these cases and handle them specially. */
4073
4074 for (addr = addrlist; addr; addr = addr->next)
4075 {
4076 /* If host is not NULL, it means that we stopped processing the host list
4077 because of hosts_max_try or hosts_max_try_hardlimit. In the former case, this
4078 means we need to behave as if some hosts were skipped because their retry
4079 time had not come. Specifically, this prevents the address from timing out.
4080 However, if we have hit hosts_max_try_hardlimit, we want to behave as if all
4081 hosts were tried. */
4082
4083 if (host)
4084 if (total_hosts_tried >= ob->hosts_max_try_hardlimit)
4085 {
4086 DEBUG(D_transport)
4087 debug_printf("hosts_max_try_hardlimit reached: behave as if all "
4088 "hosts were tried\n");
4089 }
4090 else
4091 {
4092 DEBUG(D_transport)
4093 debug_printf("hosts_max_try limit caused some hosts to be skipped\n");
4094 setflag(addr, af_retry_skipped);
4095 }
4096
4097 if (queue_smtp) /* no deliveries attempted */
4098 {
4099 addr->transport_return = DEFER;
4100 addr->basic_errno = 0;
4101 addr->message = US"SMTP delivery explicitly queued";
4102 }
4103
4104 else if ( addr->transport_return == DEFER
4105 && (addr->basic_errno == ERRNO_UNKNOWNERROR || addr->basic_errno == 0)
4106 && !addr->message
4107 )
4108 {
4109 addr->basic_errno = ERRNO_HRETRY;
4110 if (continue_hostname)
4111 addr->message = US"no host found for existing SMTP connection";
4112 else if (expired)
4113 {
4114 setflag(addr, af_pass_message); /* This is not a security risk */
4115 addr->message = string_sprintf(
4116 "all hosts%s have been failing for a long time %s",
4117 addr->domain ? string_sprintf(" for '%s'", addr->domain) : US"",
4118 ob->delay_after_cutoff
4119 ? US"(and retry time not reached)"
4120 : US"and were last tried after this message arrived");
4121
4122 /* If we are already using fallback hosts, or there are no fallback hosts
4123 defined, convert the result to FAIL to cause a bounce. */
4124
4125 if (addr->host_list == addr->fallback_hosts || !addr->fallback_hosts)
4126 addr->transport_return = FAIL;
4127 }
4128 else
4129 {
4130 const char * s;
4131 if (hosts_retry == hosts_total)
4132 s = "retry time not reached for any host%s";
4133 else if (hosts_fail == hosts_total)
4134 s = "all host address lookups%s failed permanently";
4135 else if (hosts_defer == hosts_total)
4136 s = "all host address lookups%s failed temporarily";
4137 else if (hosts_serial == hosts_total)
4138 s = "connection limit reached for all hosts%s";
4139 else if (hosts_fail+hosts_defer == hosts_total)
4140 s = "all host address lookups%s failed";
4141 else
4142 s = "some host address lookups failed and retry time "
4143 "not reached for other hosts or connection limit reached%s";
4144
4145 addr->message = string_sprintf(s,
4146 addr->domain ? string_sprintf(" for '%s'", addr->domain) : US"");
4147 }
4148 }
4149 }
4150
4151 /* Update the database which keeps information about which messages are waiting
4152 for which hosts to become available. For some message-specific errors, the
4153 update_waiting flag is turned off because we don't want follow-on deliveries in
4154 those cases. If this transport instance is explicitly limited to one message
4155 per connection then follow-on deliveries are not possible and there's no need
4156 to create/update the per-transport wait-<transport_name> database. */
4157
4158 if (update_waiting && tblock->connection_max_messages != 1)
4159 transport_update_waiting(hostlist, tblock->name);
4160
4161 END_TRANSPORT:
4162
4163 DEBUG(D_transport) debug_printf("Leaving %s transport\n", tblock->name);
4164
4165 return TRUE; /* Each address has its status */
4166 }
4167
4168 /* vi: aw ai sw=2
4169 */
4170 /* End of transport/smtp.c */
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