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Revert "DANE: do not trust a non-dnssec NXDOMAIN return for the TLSA lookup"
[exim.git] / src / src / transports / smtp.c
1 /*************************************************
2 * Exim - an Internet mail transport agent *
3 *************************************************/
4
5 /* Copyright (c) University of Cambridge 1995 - 2017 */
6 /* See the file NOTICE for conditions of use and distribution. */
7
8 #include "../exim.h"
9 #include "smtp.h"
10
11
12 /* Options specific to the smtp transport. This transport also supports LMTP
13 over TCP/IP. The options must be in alphabetic order (note that "_" comes
14 before the lower case letters). Some live in the transport_instance block so as
15 to be publicly visible; these are flagged with opt_public. */
16
17 optionlist smtp_transport_options[] = {
18 { "*expand_multi_domain", opt_stringptr | opt_hidden | opt_public,
19 (void *)offsetof(transport_instance, expand_multi_domain) },
20 { "*expand_retry_include_ip_address", opt_stringptr | opt_hidden,
21 (void *)(offsetof(smtp_transport_options_block, expand_retry_include_ip_address)) },
22
23 { "address_retry_include_sender", opt_bool,
24 (void *)offsetof(smtp_transport_options_block, address_retry_include_sender) },
25 { "allow_localhost", opt_bool,
26 (void *)offsetof(smtp_transport_options_block, allow_localhost) },
27 { "authenticated_sender", opt_stringptr,
28 (void *)offsetof(smtp_transport_options_block, authenticated_sender) },
29 { "authenticated_sender_force", opt_bool,
30 (void *)offsetof(smtp_transport_options_block, authenticated_sender_force) },
31 { "command_timeout", opt_time,
32 (void *)offsetof(smtp_transport_options_block, command_timeout) },
33 { "connect_timeout", opt_time,
34 (void *)offsetof(smtp_transport_options_block, connect_timeout) },
35 { "connection_max_messages", opt_int | opt_public,
36 (void *)offsetof(transport_instance, connection_max_messages) },
37 { "data_timeout", opt_time,
38 (void *)offsetof(smtp_transport_options_block, data_timeout) },
39 { "delay_after_cutoff", opt_bool,
40 (void *)offsetof(smtp_transport_options_block, delay_after_cutoff) },
41 #ifndef DISABLE_DKIM
42 { "dkim_canon", opt_stringptr,
43 (void *)offsetof(smtp_transport_options_block, dkim.dkim_canon) },
44 { "dkim_domain", opt_stringptr,
45 (void *)offsetof(smtp_transport_options_block, dkim.dkim_domain) },
46 { "dkim_private_key", opt_stringptr,
47 (void *)offsetof(smtp_transport_options_block, dkim.dkim_private_key) },
48 { "dkim_selector", opt_stringptr,
49 (void *)offsetof(smtp_transport_options_block, dkim.dkim_selector) },
50 { "dkim_sign_headers", opt_stringptr,
51 (void *)offsetof(smtp_transport_options_block, dkim.dkim_sign_headers) },
52 { "dkim_strict", opt_stringptr,
53 (void *)offsetof(smtp_transport_options_block, dkim.dkim_strict) },
54 #endif
55 { "dns_qualify_single", opt_bool,
56 (void *)offsetof(smtp_transport_options_block, dns_qualify_single) },
57 { "dns_search_parents", opt_bool,
58 (void *)offsetof(smtp_transport_options_block, dns_search_parents) },
59 { "dnssec_request_domains", opt_stringptr,
60 (void *)offsetof(smtp_transport_options_block, dnssec.request) },
61 { "dnssec_require_domains", opt_stringptr,
62 (void *)offsetof(smtp_transport_options_block, dnssec.require) },
63 { "dscp", opt_stringptr,
64 (void *)offsetof(smtp_transport_options_block, dscp) },
65 { "fallback_hosts", opt_stringptr,
66 (void *)offsetof(smtp_transport_options_block, fallback_hosts) },
67 { "final_timeout", opt_time,
68 (void *)offsetof(smtp_transport_options_block, final_timeout) },
69 { "gethostbyname", opt_bool,
70 (void *)offsetof(smtp_transport_options_block, gethostbyname) },
71 { "helo_data", opt_stringptr,
72 (void *)offsetof(smtp_transport_options_block, helo_data) },
73 { "hosts", opt_stringptr,
74 (void *)offsetof(smtp_transport_options_block, hosts) },
75 { "hosts_avoid_esmtp", opt_stringptr,
76 (void *)offsetof(smtp_transport_options_block, hosts_avoid_esmtp) },
77 { "hosts_avoid_pipelining", opt_stringptr,
78 (void *)offsetof(smtp_transport_options_block, hosts_avoid_pipelining) },
79 #ifdef SUPPORT_TLS
80 { "hosts_avoid_tls", opt_stringptr,
81 (void *)offsetof(smtp_transport_options_block, hosts_avoid_tls) },
82 #endif
83 { "hosts_max_try", opt_int,
84 (void *)offsetof(smtp_transport_options_block, hosts_max_try) },
85 { "hosts_max_try_hardlimit", opt_int,
86 (void *)offsetof(smtp_transport_options_block, hosts_max_try_hardlimit) },
87 #ifdef SUPPORT_TLS
88 { "hosts_nopass_tls", opt_stringptr,
89 (void *)offsetof(smtp_transport_options_block, hosts_nopass_tls) },
90 { "hosts_noproxy_tls", opt_stringptr,
91 (void *)offsetof(smtp_transport_options_block, hosts_noproxy_tls) },
92 #endif
93 { "hosts_override", opt_bool,
94 (void *)offsetof(smtp_transport_options_block, hosts_override) },
95 { "hosts_randomize", opt_bool,
96 (void *)offsetof(smtp_transport_options_block, hosts_randomize) },
97 #if defined(SUPPORT_TLS) && !defined(DISABLE_OCSP)
98 { "hosts_request_ocsp", opt_stringptr,
99 (void *)offsetof(smtp_transport_options_block, hosts_request_ocsp) },
100 #endif
101 { "hosts_require_auth", opt_stringptr,
102 (void *)offsetof(smtp_transport_options_block, hosts_require_auth) },
103 #ifdef SUPPORT_TLS
104 # ifdef EXPERIMENTAL_DANE
105 { "hosts_require_dane", opt_stringptr,
106 (void *)offsetof(smtp_transport_options_block, hosts_require_dane) },
107 # endif
108 # ifndef DISABLE_OCSP
109 { "hosts_require_ocsp", opt_stringptr,
110 (void *)offsetof(smtp_transport_options_block, hosts_require_ocsp) },
111 # endif
112 { "hosts_require_tls", opt_stringptr,
113 (void *)offsetof(smtp_transport_options_block, hosts_require_tls) },
114 #endif
115 { "hosts_try_auth", opt_stringptr,
116 (void *)offsetof(smtp_transport_options_block, hosts_try_auth) },
117 { "hosts_try_chunking", opt_stringptr,
118 (void *)offsetof(smtp_transport_options_block, hosts_try_chunking) },
119 #if defined(SUPPORT_TLS) && defined(EXPERIMENTAL_DANE)
120 { "hosts_try_dane", opt_stringptr,
121 (void *)offsetof(smtp_transport_options_block, hosts_try_dane) },
122 #endif
123 { "hosts_try_fastopen", opt_stringptr,
124 (void *)offsetof(smtp_transport_options_block, hosts_try_fastopen) },
125 #ifndef DISABLE_PRDR
126 { "hosts_try_prdr", opt_stringptr,
127 (void *)offsetof(smtp_transport_options_block, hosts_try_prdr) },
128 #endif
129 #ifdef SUPPORT_TLS
130 { "hosts_verify_avoid_tls", opt_stringptr,
131 (void *)offsetof(smtp_transport_options_block, hosts_verify_avoid_tls) },
132 #endif
133 { "interface", opt_stringptr,
134 (void *)offsetof(smtp_transport_options_block, interface) },
135 { "keepalive", opt_bool,
136 (void *)offsetof(smtp_transport_options_block, keepalive) },
137 { "lmtp_ignore_quota", opt_bool,
138 (void *)offsetof(smtp_transport_options_block, lmtp_ignore_quota) },
139 { "max_rcpt", opt_int | opt_public,
140 (void *)offsetof(transport_instance, max_addresses) },
141 { "multi_domain", opt_expand_bool | opt_public,
142 (void *)offsetof(transport_instance, multi_domain) },
143 { "port", opt_stringptr,
144 (void *)offsetof(smtp_transport_options_block, port) },
145 { "protocol", opt_stringptr,
146 (void *)offsetof(smtp_transport_options_block, protocol) },
147 { "retry_include_ip_address", opt_expand_bool,
148 (void *)offsetof(smtp_transport_options_block, retry_include_ip_address) },
149 { "serialize_hosts", opt_stringptr,
150 (void *)offsetof(smtp_transport_options_block, serialize_hosts) },
151 { "size_addition", opt_int,
152 (void *)offsetof(smtp_transport_options_block, size_addition) }
153 #ifdef SUPPORT_SOCKS
154 ,{ "socks_proxy", opt_stringptr,
155 (void *)offsetof(smtp_transport_options_block, socks_proxy) }
156 #endif
157 #ifdef SUPPORT_TLS
158 ,{ "tls_certificate", opt_stringptr,
159 (void *)offsetof(smtp_transport_options_block, tls_certificate) },
160 { "tls_crl", opt_stringptr,
161 (void *)offsetof(smtp_transport_options_block, tls_crl) },
162 { "tls_dh_min_bits", opt_int,
163 (void *)offsetof(smtp_transport_options_block, tls_dh_min_bits) },
164 { "tls_privatekey", opt_stringptr,
165 (void *)offsetof(smtp_transport_options_block, tls_privatekey) },
166 { "tls_require_ciphers", opt_stringptr,
167 (void *)offsetof(smtp_transport_options_block, tls_require_ciphers) },
168 { "tls_sni", opt_stringptr,
169 (void *)offsetof(smtp_transport_options_block, tls_sni) },
170 { "tls_tempfail_tryclear", opt_bool,
171 (void *)offsetof(smtp_transport_options_block, tls_tempfail_tryclear) },
172 { "tls_try_verify_hosts", opt_stringptr,
173 (void *)offsetof(smtp_transport_options_block, tls_try_verify_hosts) },
174 { "tls_verify_cert_hostnames", opt_stringptr,
175 (void *)offsetof(smtp_transport_options_block,tls_verify_cert_hostnames)},
176 { "tls_verify_certificates", opt_stringptr,
177 (void *)offsetof(smtp_transport_options_block, tls_verify_certificates) },
178 { "tls_verify_hosts", opt_stringptr,
179 (void *)offsetof(smtp_transport_options_block, tls_verify_hosts) }
180 #endif
181 };
182
183 /* Size of the options list. An extern variable has to be used so that its
184 address can appear in the tables drtables.c. */
185
186 int smtp_transport_options_count =
187 sizeof(smtp_transport_options)/sizeof(optionlist);
188
189 /* Default private options block for the smtp transport. */
190
191 smtp_transport_options_block smtp_transport_option_defaults = {
192 NULL, /* hosts */
193 NULL, /* fallback_hosts */
194 NULL, /* hostlist */
195 NULL, /* fallback_hostlist */
196 NULL, /* authenticated_sender */
197 US"$primary_hostname", /* helo_data */
198 NULL, /* interface */
199 NULL, /* port */
200 US"smtp", /* protocol */
201 NULL, /* DSCP */
202 NULL, /* serialize_hosts */
203 NULL, /* hosts_try_auth */
204 NULL, /* hosts_require_auth */
205 US"*", /* hosts_try_chunking */
206 #ifdef EXPERIMENTAL_DANE
207 NULL, /* hosts_try_dane */
208 NULL, /* hosts_require_dane */
209 #endif
210 NULL, /* hosts_try_fastopen */
211 #ifndef DISABLE_PRDR
212 US"*", /* hosts_try_prdr */
213 #endif
214 #ifndef DISABLE_OCSP
215 US"*", /* hosts_request_ocsp (except under DANE; tls_client_start()) */
216 NULL, /* hosts_require_ocsp */
217 #endif
218 NULL, /* hosts_require_tls */
219 NULL, /* hosts_avoid_tls */
220 NULL, /* hosts_verify_avoid_tls */
221 NULL, /* hosts_avoid_pipelining */
222 NULL, /* hosts_avoid_esmtp */
223 #ifdef SUPPORT_TLS
224 NULL, /* hosts_nopass_tls */
225 US"*", /* hosts_noproxy_tls */
226 #endif
227 5*60, /* command_timeout */
228 5*60, /* connect_timeout; shorter system default overrides */
229 5*60, /* data timeout */
230 10*60, /* final timeout */
231 1024, /* size_addition */
232 5, /* hosts_max_try */
233 50, /* hosts_max_try_hardlimit */
234 TRUE, /* address_retry_include_sender */
235 FALSE, /* allow_localhost */
236 FALSE, /* authenticated_sender_force */
237 FALSE, /* gethostbyname */
238 TRUE, /* dns_qualify_single */
239 FALSE, /* dns_search_parents */
240 { NULL, NULL }, /* dnssec_domains {request,require} */
241 TRUE, /* delay_after_cutoff */
242 FALSE, /* hosts_override */
243 FALSE, /* hosts_randomize */
244 TRUE, /* keepalive */
245 FALSE, /* lmtp_ignore_quota */
246 NULL, /* expand_retry_include_ip_address */
247 TRUE /* retry_include_ip_address */
248 #ifdef SUPPORT_SOCKS
249 ,NULL /* socks_proxy */
250 #endif
251 #ifdef SUPPORT_TLS
252 ,NULL, /* tls_certificate */
253 NULL, /* tls_crl */
254 NULL, /* tls_privatekey */
255 NULL, /* tls_require_ciphers */
256 NULL, /* tls_sni */
257 US"system", /* tls_verify_certificates */
258 EXIM_CLIENT_DH_DEFAULT_MIN_BITS,
259 /* tls_dh_min_bits */
260 TRUE, /* tls_tempfail_tryclear */
261 NULL, /* tls_verify_hosts */
262 US"*", /* tls_try_verify_hosts */
263 US"*" /* tls_verify_cert_hostnames */
264 #endif
265 #ifndef DISABLE_DKIM
266 , {NULL, /* dkim_canon */
267 NULL, /* dkim_domain */
268 NULL, /* dkim_private_key */
269 NULL, /* dkim_selector */
270 NULL, /* dkim_sign_headers */
271 NULL, /* dkim_strict */
272 FALSE} /* dot_stuffed */
273 #endif
274 };
275
276 /* some DSN flags for use later */
277
278 static int rf_list[] = {rf_notify_never, rf_notify_success,
279 rf_notify_failure, rf_notify_delay };
280
281 static uschar *rf_names[] = { US"NEVER", US"SUCCESS", US"FAILURE", US"DELAY" };
282
283
284
285 /* Local statics */
286
287 static uschar *smtp_command; /* Points to last cmd for error messages */
288 static uschar *mail_command; /* Points to MAIL cmd for error messages */
289 static uschar *data_command = US""; /* Points to DATA cmd for error messages */
290 static BOOL update_waiting; /* TRUE to update the "wait" database */
291
292 /*XXX move to smtp_context */
293 static BOOL pipelining_active; /* current transaction is in pipe mode */
294
295
296 /*************************************************
297 * Setup entry point *
298 *************************************************/
299
300 /* This function is called when the transport is about to be used,
301 but before running it in a sub-process. It is used for two things:
302
303 (1) To set the fallback host list in addresses, when delivering.
304 (2) To pass back the interface, port, protocol, and other options, for use
305 during callout verification.
306
307 Arguments:
308 tblock pointer to the transport instance block
309 addrlist list of addresses about to be transported
310 tf if not NULL, pointer to block in which to return options
311 uid the uid that will be set (not used)
312 gid the gid that will be set (not used)
313 errmsg place for error message (not used)
314
315 Returns: OK always (FAIL, DEFER not used)
316 */
317
318 static int
319 smtp_transport_setup(transport_instance *tblock, address_item *addrlist,
320 transport_feedback *tf, uid_t uid, gid_t gid, uschar **errmsg)
321 {
322 smtp_transport_options_block *ob =
323 (smtp_transport_options_block *)(tblock->options_block);
324
325 errmsg = errmsg; /* Keep picky compilers happy */
326 uid = uid;
327 gid = gid;
328
329 /* Pass back options if required. This interface is getting very messy. */
330
331 if (tf)
332 {
333 tf->interface = ob->interface;
334 tf->port = ob->port;
335 tf->protocol = ob->protocol;
336 tf->hosts = ob->hosts;
337 tf->hosts_override = ob->hosts_override;
338 tf->hosts_randomize = ob->hosts_randomize;
339 tf->gethostbyname = ob->gethostbyname;
340 tf->qualify_single = ob->dns_qualify_single;
341 tf->search_parents = ob->dns_search_parents;
342 tf->helo_data = ob->helo_data;
343 }
344
345 /* Set the fallback host list for all the addresses that don't have fallback
346 host lists, provided that the local host wasn't present in the original host
347 list. */
348
349 if (!testflag(addrlist, af_local_host_removed))
350 for (; addrlist; addrlist = addrlist->next)
351 if (!addrlist->fallback_hosts) addrlist->fallback_hosts = ob->fallback_hostlist;
352
353 return OK;
354 }
355
356
357
358 /*************************************************
359 * Initialization entry point *
360 *************************************************/
361
362 /* Called for each instance, after its options have been read, to
363 enable consistency checks to be done, or anything else that needs
364 to be set up.
365
366 Argument: pointer to the transport instance block
367 Returns: nothing
368 */
369
370 void
371 smtp_transport_init(transport_instance *tblock)
372 {
373 smtp_transport_options_block *ob =
374 (smtp_transport_options_block *)(tblock->options_block);
375
376 /* Retry_use_local_part defaults FALSE if unset */
377
378 if (tblock->retry_use_local_part == TRUE_UNSET)
379 tblock->retry_use_local_part = FALSE;
380
381 /* Set the default port according to the protocol */
382
383 if (ob->port == NULL)
384 ob->port = (strcmpic(ob->protocol, US"lmtp") == 0)? US"lmtp" :
385 (strcmpic(ob->protocol, US"smtps") == 0)? US"smtps" : US"smtp";
386
387 /* Set up the setup entry point, to be called before subprocesses for this
388 transport. */
389
390 tblock->setup = smtp_transport_setup;
391
392 /* Complain if any of the timeouts are zero. */
393
394 if (ob->command_timeout <= 0 || ob->data_timeout <= 0 ||
395 ob->final_timeout <= 0)
396 log_write(0, LOG_PANIC_DIE|LOG_CONFIG,
397 "command, data, or final timeout value is zero for %s transport",
398 tblock->name);
399
400 /* If hosts_override is set and there are local hosts, set the global
401 flag that stops verify from showing router hosts. */
402
403 if (ob->hosts_override && ob->hosts != NULL) tblock->overrides_hosts = TRUE;
404
405 /* If there are any fallback hosts listed, build a chain of host items
406 for them, but do not do any lookups at this time. */
407
408 host_build_hostlist(&(ob->fallback_hostlist), ob->fallback_hosts, FALSE);
409 }
410
411
412
413
414
415 /*************************************************
416 * Set delivery info into all active addresses *
417 *************************************************/
418
419 /* Only addresses whose status is >= PENDING are relevant. A lesser
420 status means that an address is not currently being processed.
421
422 Arguments:
423 addrlist points to a chain of addresses
424 errno_value to put in each address's errno field
425 msg to put in each address's message field
426 rc to put in each address's transport_return field
427 pass_message if TRUE, set the "pass message" flag in the address
428 host if set, mark addrs as having used this host
429 smtp_greeting from peer
430 helo_response from peer
431
432 If errno_value has the special value ERRNO_CONNECTTIMEOUT, ETIMEDOUT is put in
433 the errno field, and RTEF_CTOUT is ORed into the more_errno field, to indicate
434 this particular type of timeout.
435
436 Returns: nothing
437 */
438
439 static void
440 set_errno(address_item *addrlist, int errno_value, uschar *msg, int rc,
441 BOOL pass_message, host_item * host
442 #ifdef EXPERIMENTAL_DSN_INFO
443 , const uschar * smtp_greeting, const uschar * helo_response
444 #endif
445 )
446 {
447 address_item *addr;
448 int orvalue = 0;
449 if (errno_value == ERRNO_CONNECTTIMEOUT)
450 {
451 errno_value = ETIMEDOUT;
452 orvalue = RTEF_CTOUT;
453 }
454 for (addr = addrlist; addr; addr = addr->next)
455 if (addr->transport_return >= PENDING)
456 {
457 addr->basic_errno = errno_value;
458 addr->more_errno |= orvalue;
459 if (msg)
460 {
461 addr->message = msg;
462 if (pass_message) setflag(addr, af_pass_message);
463 }
464 addr->transport_return = rc;
465 if (host)
466 {
467 addr->host_used = host;
468 #ifdef EXPERIMENTAL_DSN_INFO
469 if (smtp_greeting)
470 {uschar * s = Ustrchr(smtp_greeting, '\n'); if (s) *s = '\0';}
471 addr->smtp_greeting = smtp_greeting;
472
473 if (helo_response)
474 {uschar * s = Ustrchr(helo_response, '\n'); if (s) *s = '\0';}
475 addr->helo_response = helo_response;
476 #endif
477 }
478 }
479 }
480
481 static void
482 set_errno_nohost(address_item *addrlist, int errno_value, uschar *msg, int rc,
483 BOOL pass_message)
484 {
485 set_errno(addrlist, errno_value, msg, rc, pass_message, NULL
486 #ifdef EXPERIMENTAL_DSN_INFO
487 , NULL, NULL
488 #endif
489 );
490 }
491
492
493 /*************************************************
494 * Check an SMTP response *
495 *************************************************/
496
497 /* This function is given an errno code and the SMTP response buffer
498 to analyse, together with the host identification for generating messages. It
499 sets an appropriate message and puts the first digit of the response code into
500 the yield variable. If no response was actually read, a suitable digit is
501 chosen.
502
503 Arguments:
504 host the current host, to get its name for messages
505 errno_value pointer to the errno value
506 more_errno from the top address for use with ERRNO_FILTER_FAIL
507 buffer the SMTP response buffer
508 yield where to put a one-digit SMTP response code
509 message where to put an error message
510 pass_message set TRUE if message is an SMTP response
511
512 Returns: TRUE if an SMTP "QUIT" command should be sent, else FALSE
513 */
514
515 static BOOL
516 check_response(host_item *host, int *errno_value, int more_errno,
517 uschar *buffer, int *yield, uschar **message, BOOL *pass_message)
518 {
519 uschar * pl = pipelining_active ? US"pipelined " : US"";
520 const uschar * s;
521
522 *yield = '4'; /* Default setting is to give a temporary error */
523
524 switch(*errno_value)
525 {
526 case ETIMEDOUT: /* Handle response timeout */
527 *message = US string_sprintf("SMTP timeout after %s%s",
528 pl, smtp_command);
529 if (transport_count > 0)
530 *message = US string_sprintf("%s (%d bytes written)", *message,
531 transport_count);
532 return FALSE;
533
534 case ERRNO_SMTPFORMAT: /* Handle malformed SMTP response */
535 s = string_printing(buffer);
536 while (isspace(*s)) s++;
537 *message = *s == 0
538 ? string_sprintf("Malformed SMTP reply (an empty line) "
539 "in response to %s%s", pl, smtp_command)
540 : string_sprintf("Malformed SMTP reply in response to %s%s: %s",
541 pl, smtp_command, s);
542 return FALSE;
543
544 case ERRNO_FILTER_FAIL: /* Handle a failed filter process error;
545 can't send QUIT as we mustn't end the DATA. */
546 *message = string_sprintf("transport filter process failed (%d)%s",
547 more_errno,
548 more_errno == EX_EXECFAILED ? ": unable to execute command" : "");
549 return FALSE;
550
551 case ERRNO_CHHEADER_FAIL: /* Handle a failed add_headers expansion;
552 can't send QUIT as we mustn't end the DATA. */
553 *message =
554 string_sprintf("failed to expand headers_add or headers_remove: %s",
555 expand_string_message);
556 return FALSE;
557
558 case ERRNO_WRITEINCOMPLETE: /* failure to write a complete data block */
559 *message = string_sprintf("failed to write a data block");
560 return FALSE;
561
562 #ifdef SUPPORT_I18N
563 case ERRNO_UTF8_FWD: /* no advertised SMTPUTF8, for international message */
564 *message = US"utf8 support required but not offered for forwarding";
565 DEBUG(D_deliver|D_transport) debug_printf("%s\n", *message);
566 return TRUE;
567 #endif
568 }
569
570 /* Handle error responses from the remote mailer. */
571
572 if (buffer[0] != 0)
573 {
574 *message = string_sprintf("SMTP error from remote mail server after %s%s: "
575 "%s", pl, smtp_command, s = string_printing(buffer));
576 *pass_message = TRUE;
577 *yield = buffer[0];
578 return TRUE;
579 }
580
581 /* No data was read. If there is no errno, this must be the EOF (i.e.
582 connection closed) case, which causes deferral. An explicit connection reset
583 error has the same effect. Otherwise, put the host's identity in the message,
584 leaving the errno value to be interpreted as well. In all cases, we have to
585 assume the connection is now dead. */
586
587 if (*errno_value == 0 || *errno_value == ECONNRESET)
588 {
589 *errno_value = ERRNO_SMTPCLOSED;
590 *message = US string_sprintf("Remote host closed connection "
591 "in response to %s%s", pl, smtp_command);
592 }
593 else
594 *message = US string_sprintf("%s [%s]", host->name, host->address);
595
596 return FALSE;
597 }
598
599
600
601 /*************************************************
602 * Write error message to logs *
603 *************************************************/
604
605 /* This writes to the main log and to the message log.
606
607 Arguments:
608 addr the address item containing error information
609 host the current host
610
611 Returns: nothing
612 */
613
614 static void
615 write_logs(address_item *addr, host_item *host)
616 {
617 uschar * message = LOGGING(outgoing_port)
618 ? string_sprintf("H=%s [%s]:%d", host->name, host->address,
619 host->port == PORT_NONE ? 25 : host->port)
620 : string_sprintf("H=%s [%s]", host->name, host->address);
621
622 if (addr->message)
623 {
624 message = string_sprintf("%s: %s", message, addr->message);
625 if (addr->basic_errno > 0)
626 message = string_sprintf("%s: %s", message, strerror(addr->basic_errno));
627 log_write(0, LOG_MAIN, "%s", message);
628 deliver_msglog("%s %s\n", tod_stamp(tod_log), message);
629 }
630 else
631 {
632 const uschar * s = exim_errstr(addr->basic_errno);
633 log_write(0, LOG_MAIN, "%s %s", message, s);
634 deliver_msglog("%s %s %s\n", tod_stamp(tod_log), message, s);
635 }
636 }
637
638 static void
639 msglog_line(host_item * host, uschar * message)
640 {
641 deliver_msglog("%s H=%s [%s] %s\n", tod_stamp(tod_log),
642 host->name, host->address, message);
643 }
644
645
646
647 #ifndef DISABLE_EVENT
648 /*************************************************
649 * Post-defer action *
650 *************************************************/
651
652 /* This expands an arbitrary per-transport string.
653 It might, for example, be used to write to the database log.
654
655 Arguments:
656 addr the address item containing error information
657 host the current host
658
659 Returns: nothing
660 */
661
662 static void
663 deferred_event_raise(address_item *addr, host_item *host)
664 {
665 uschar * action = addr->transport->event_action;
666 const uschar * save_domain;
667 uschar * save_local;
668
669 if (!action)
670 return;
671
672 save_domain = deliver_domain;
673 save_local = deliver_localpart;
674
675 /*XXX would ip & port already be set up? */
676 deliver_host_address = string_copy(host->address);
677 deliver_host_port = host->port == PORT_NONE ? 25 : host->port;
678 event_defer_errno = addr->basic_errno;
679
680 router_name = addr->router->name;
681 transport_name = addr->transport->name;
682 deliver_domain = addr->domain;
683 deliver_localpart = addr->local_part;
684
685 (void) event_raise(action, US"msg:host:defer",
686 addr->message
687 ? addr->basic_errno > 0
688 ? string_sprintf("%s: %s", addr->message, strerror(addr->basic_errno))
689 : string_copy(addr->message)
690 : addr->basic_errno > 0
691 ? string_copy(US strerror(addr->basic_errno))
692 : NULL);
693
694 deliver_localpart = save_local;
695 deliver_domain = save_domain;
696 router_name = transport_name = NULL;
697 }
698 #endif
699
700 /*************************************************
701 * Synchronize SMTP responses *
702 *************************************************/
703
704 /* This function is called from smtp_deliver() to receive SMTP responses from
705 the server, and match them up with the commands to which they relate. When
706 PIPELINING is not in use, this function is called after every command, and is
707 therefore somewhat over-engineered, but it is simpler to use a single scheme
708 that works both with and without PIPELINING instead of having two separate sets
709 of code.
710
711 The set of commands that are buffered up with pipelining may start with MAIL
712 and may end with DATA; in between are RCPT commands that correspond to the
713 addresses whose status is PENDING_DEFER. All other commands (STARTTLS, AUTH,
714 etc.) are never buffered.
715
716 Errors after MAIL or DATA abort the whole process leaving the response in the
717 buffer. After MAIL, pending responses are flushed, and the original command is
718 re-instated in big_buffer for error messages. For RCPT commands, the remote is
719 permitted to reject some recipient addresses while accepting others. However
720 certain errors clearly abort the whole process. Set the value in
721 transport_return to PENDING_OK if the address is accepted. If there is a
722 subsequent general error, it will get reset accordingly. If not, it will get
723 converted to OK at the end.
724
725 Arguments:
726 sx smtp connection context
727 count the number of responses to read
728 pending_DATA 0 if last command sent was not DATA
729 +1 if previously had a good recipient
730 -1 if not previously had a good recipient
731
732 Returns: 3 if at least one address had 2xx and one had 5xx
733 2 if at least one address had 5xx but none had 2xx
734 1 if at least one host had a 2xx response, but none had 5xx
735 0 no address had 2xx or 5xx but no errors (all 4xx, or just DATA)
736 -1 timeout while reading RCPT response
737 -2 I/O or other non-response error for RCPT
738 -3 DATA or MAIL failed - errno and buffer set
739 */
740
741 static int
742 sync_responses(smtp_context * sx, int count, int pending_DATA)
743 {
744 address_item *addr = sx->sync_addr;
745 smtp_transport_options_block *ob =
746 (smtp_transport_options_block *)sx->tblock->options_block;
747 int yield = 0;
748
749 /* Handle the response for a MAIL command. On error, reinstate the original
750 command in big_buffer for error message use, and flush any further pending
751 responses before returning, except after I/O errors and timeouts. */
752
753 if (sx->pending_MAIL)
754 {
755 count--;
756 if (!smtp_read_response(&sx->inblock, sx->buffer, sizeof(sx->buffer),
757 '2', ob->command_timeout))
758 {
759 DEBUG(D_transport) debug_printf("bad response for MAIL\n");
760 Ustrcpy(big_buffer, mail_command); /* Fits, because it came from there! */
761 if (errno == 0 && sx->buffer[0] != 0)
762 {
763 uschar flushbuffer[4096];
764 int save_errno = 0;
765 if (sx->buffer[0] == '4')
766 {
767 save_errno = ERRNO_MAIL4XX;
768 addr->more_errno |= ((sx->buffer[1] - '0')*10 + sx->buffer[2] - '0') << 8;
769 }
770 while (count-- > 0)
771 {
772 if (!smtp_read_response(&sx->inblock, flushbuffer, sizeof(flushbuffer),
773 '2', ob->command_timeout)
774 && (errno != 0 || flushbuffer[0] == 0))
775 break;
776 }
777 errno = save_errno;
778 }
779
780 if (pending_DATA) count--; /* Number of RCPT responses to come */
781 while (count-- > 0) /* Mark any pending addrs with the host used */
782 {
783 while (addr->transport_return != PENDING_DEFER) addr = addr->next;
784 addr->host_used = sx->host;
785 addr = addr->next;
786 }
787 return -3;
788 }
789 }
790
791 if (pending_DATA) count--; /* Number of RCPT responses to come */
792
793 /* Read and handle the required number of RCPT responses, matching each one up
794 with an address by scanning for the next address whose status is PENDING_DEFER.
795 */
796
797 while (count-- > 0)
798 {
799 while (addr->transport_return != PENDING_DEFER)
800 if (!(addr = addr->next))
801 return -2;
802
803 /* The address was accepted */
804 addr->host_used = sx->host;
805
806 if (smtp_read_response(&sx->inblock, sx->buffer, sizeof(sx->buffer),
807 '2', ob->command_timeout))
808 {
809 yield |= 1;
810 addr->transport_return = PENDING_OK;
811
812 /* If af_dr_retry_exists is set, there was a routing delay on this address;
813 ensure that any address-specific retry record is expunged. We do this both
814 for the basic key and for the version that also includes the sender. */
815
816 if (testflag(addr, af_dr_retry_exists))
817 {
818 uschar *altkey = string_sprintf("%s:<%s>", addr->address_retry_key,
819 sender_address);
820 retry_add_item(addr, altkey, rf_delete);
821 retry_add_item(addr, addr->address_retry_key, rf_delete);
822 }
823 }
824
825 /* Timeout while reading the response */
826
827 else if (errno == ETIMEDOUT)
828 {
829 uschar *message = string_sprintf("SMTP timeout after RCPT TO:<%s>",
830 transport_rcpt_address(addr, sx->tblock->rcpt_include_affixes));
831 set_errno_nohost(sx->first_addr, ETIMEDOUT, message, DEFER, FALSE);
832 retry_add_item(addr, addr->address_retry_key, 0);
833 update_waiting = FALSE;
834 return -1;
835 }
836
837 /* Handle other errors in obtaining an SMTP response by returning -1. This
838 will cause all the addresses to be deferred. Restore the SMTP command in
839 big_buffer for which we are checking the response, so the error message
840 makes sense. */
841
842 else if (errno != 0 || sx->buffer[0] == 0)
843 {
844 string_format(big_buffer, big_buffer_size, "RCPT TO:<%s>",
845 transport_rcpt_address(addr, sx->tblock->rcpt_include_affixes));
846 return -2;
847 }
848
849 /* Handle SMTP permanent and temporary response codes. */
850
851 else
852 {
853 addr->message =
854 string_sprintf("SMTP error from remote mail server after RCPT TO:<%s>: "
855 "%s", transport_rcpt_address(addr, sx->tblock->rcpt_include_affixes),
856 string_printing(sx->buffer));
857 setflag(addr, af_pass_message);
858 if (!sx->verify)
859 msglog_line(sx->host, addr->message);
860
861 /* The response was 5xx */
862
863 if (sx->buffer[0] == '5')
864 {
865 addr->transport_return = FAIL;
866 yield |= 2;
867 }
868
869 /* The response was 4xx */
870
871 else
872 {
873 addr->transport_return = DEFER;
874 addr->basic_errno = ERRNO_RCPT4XX;
875 addr->more_errno |= ((sx->buffer[1] - '0')*10 + sx->buffer[2] - '0') << 8;
876
877 if (!sx->verify)
878 {
879 #ifndef DISABLE_EVENT
880 event_defer_errno = addr->more_errno;
881 msg_event_raise(US"msg:rcpt:host:defer", addr);
882 #endif
883
884 /* Log temporary errors if there are more hosts to be tried.
885 If not, log this last one in the == line. */
886
887 if (sx->host->next)
888 log_write(0, LOG_MAIN, "H=%s [%s]: %s",
889 sx->host->name, sx->host->address, addr->message);
890
891 #ifndef DISABLE_EVENT
892 else
893 msg_event_raise(US"msg:rcpt:defer", addr);
894 #endif
895
896 /* Do not put this message on the list of those waiting for specific
897 hosts, as otherwise it is likely to be tried too often. */
898
899 update_waiting = FALSE;
900
901 /* Add a retry item for the address so that it doesn't get tried again
902 too soon. If address_retry_include_sender is true, add the sender address
903 to the retry key. */
904
905 retry_add_item(addr,
906 ob->address_retry_include_sender
907 ? string_sprintf("%s:<%s>", addr->address_retry_key, sender_address)
908 : addr->address_retry_key,
909 0);
910 }
911 }
912 }
913 } /* Loop for next RCPT response */
914
915 /* Update where to start at for the next block of responses, unless we
916 have already handled all the addresses. */
917
918 if (addr) sx->sync_addr = addr->next;
919
920 /* Handle a response to DATA. If we have not had any good recipients, either
921 previously or in this block, the response is ignored. */
922
923 if (pending_DATA != 0 &&
924 !smtp_read_response(&sx->inblock, sx->buffer, sizeof(sx->buffer),
925 '3', ob->command_timeout))
926 {
927 int code;
928 uschar *msg;
929 BOOL pass_message;
930 if (pending_DATA > 0 || (yield & 1) != 0)
931 {
932 if (errno == 0 && sx->buffer[0] == '4')
933 {
934 errno = ERRNO_DATA4XX;
935 sx->first_addr->more_errno |= ((sx->buffer[1] - '0')*10 + sx->buffer[2] - '0') << 8;
936 }
937 return -3;
938 }
939 (void)check_response(sx->host, &errno, 0, sx->buffer, &code, &msg, &pass_message);
940 DEBUG(D_transport) debug_printf("%s\nerror for DATA ignored: pipelining "
941 "is in use and there were no good recipients\n", msg);
942 }
943
944 /* All responses read and handled; MAIL (if present) received 2xx and DATA (if
945 present) received 3xx. If any RCPTs were handled and yielded anything other
946 than 4xx, yield will be set non-zero. */
947
948 return yield;
949 }
950
951
952
953 /* Do the client side of smtp-level authentication */
954 /*
955 Arguments:
956 buffer EHLO response from server (gets overwritten)
957 addrlist chain of potential addresses to deliver
958 host host to deliver to
959 ob transport options
960 ibp, obp comms channel control blocks
961
962 Returns:
963 OK Success, or failed (but not required): global "smtp_authenticated" set
964 DEFER Failed authentication (and was required)
965 ERROR Internal problem
966
967 FAIL_SEND Failed communications - transmit
968 FAIL - response
969 */
970
971 int
972 smtp_auth(uschar *buffer, unsigned bufsize, address_item *addrlist, host_item *host,
973 smtp_transport_options_block *ob, BOOL is_esmtp,
974 smtp_inblock *ibp, smtp_outblock *obp)
975 {
976 int require_auth;
977 uschar *fail_reason = US"server did not advertise AUTH support";
978
979 smtp_authenticated = FALSE;
980 client_authenticator = client_authenticated_id = client_authenticated_sender = NULL;
981 require_auth = verify_check_given_host(&ob->hosts_require_auth, host);
982
983 if (is_esmtp && !regex_AUTH) regex_AUTH =
984 regex_must_compile(US"\\n250[\\s\\-]AUTH\\s+([\\-\\w\\s]+)(?:\\n|$)",
985 FALSE, TRUE);
986
987 if (is_esmtp && regex_match_and_setup(regex_AUTH, buffer, 0, -1))
988 {
989 uschar *names = string_copyn(expand_nstring[1], expand_nlength[1]);
990 expand_nmax = -1; /* reset */
991
992 /* Must not do this check until after we have saved the result of the
993 regex match above. */
994
995 if (require_auth == OK ||
996 verify_check_given_host(&ob->hosts_try_auth, host) == OK)
997 {
998 auth_instance *au;
999 fail_reason = US"no common mechanisms were found";
1000
1001 DEBUG(D_transport) debug_printf("scanning authentication mechanisms\n");
1002
1003 /* Scan the configured authenticators looking for one which is configured
1004 for use as a client, which is not suppressed by client_condition, and
1005 whose name matches an authentication mechanism supported by the server.
1006 If one is found, attempt to authenticate by calling its client function.
1007 */
1008
1009 for (au = auths; !smtp_authenticated && au != NULL; au = au->next)
1010 {
1011 uschar *p = names;
1012 if (!au->client ||
1013 (au->client_condition != NULL &&
1014 !expand_check_condition(au->client_condition, au->name,
1015 US"client authenticator")))
1016 {
1017 DEBUG(D_transport) debug_printf("skipping %s authenticator: %s\n",
1018 au->name,
1019 (au->client)? "client_condition is false" :
1020 "not configured as a client");
1021 continue;
1022 }
1023
1024 /* Loop to scan supported server mechanisms */
1025
1026 while (*p != 0)
1027 {
1028 int rc;
1029 int len = Ustrlen(au->public_name);
1030 while (isspace(*p)) p++;
1031
1032 if (strncmpic(au->public_name, p, len) != 0 ||
1033 (p[len] != 0 && !isspace(p[len])))
1034 {
1035 while (*p != 0 && !isspace(*p)) p++;
1036 continue;
1037 }
1038
1039 /* Found data for a listed mechanism. Call its client entry. Set
1040 a flag in the outblock so that data is overwritten after sending so
1041 that reflections don't show it. */
1042
1043 fail_reason = US"authentication attempt(s) failed";
1044 obp->authenticating = TRUE;
1045 rc = (au->info->clientcode)(au, ibp, obp,
1046 ob->command_timeout, buffer, bufsize);
1047 obp->authenticating = FALSE;
1048 DEBUG(D_transport) debug_printf("%s authenticator yielded %d\n",
1049 au->name, rc);
1050
1051 /* A temporary authentication failure must hold up delivery to
1052 this host. After a permanent authentication failure, we carry on
1053 to try other authentication methods. If all fail hard, try to
1054 deliver the message unauthenticated unless require_auth was set. */
1055
1056 switch(rc)
1057 {
1058 case OK:
1059 smtp_authenticated = TRUE; /* stops the outer loop */
1060 client_authenticator = au->name;
1061 if (au->set_client_id != NULL)
1062 client_authenticated_id = expand_string(au->set_client_id);
1063 break;
1064
1065 /* Failure after writing a command */
1066
1067 case FAIL_SEND:
1068 return FAIL_SEND;
1069
1070 /* Failure after reading a response */
1071
1072 case FAIL:
1073 if (errno != 0 || buffer[0] != '5') return FAIL;
1074 log_write(0, LOG_MAIN, "%s authenticator failed H=%s [%s] %s",
1075 au->name, host->name, host->address, buffer);
1076 break;
1077
1078 /* Failure by some other means. In effect, the authenticator
1079 decided it wasn't prepared to handle this case. Typically this
1080 is the result of "fail" in an expansion string. Do we need to
1081 log anything here? Feb 2006: a message is now put in the buffer
1082 if logging is required. */
1083
1084 case CANCELLED:
1085 if (*buffer != 0)
1086 log_write(0, LOG_MAIN, "%s authenticator cancelled "
1087 "authentication H=%s [%s] %s", au->name, host->name,
1088 host->address, buffer);
1089 break;
1090
1091 /* Internal problem, message in buffer. */
1092
1093 case ERROR:
1094 set_errno_nohost(addrlist, ERRNO_AUTHPROB, string_copy(buffer),
1095 DEFER, FALSE);
1096 return ERROR;
1097 }
1098
1099 break; /* If not authenticated, try next authenticator */
1100 } /* Loop for scanning supported server mechanisms */
1101 } /* Loop for further authenticators */
1102 }
1103 }
1104
1105 /* If we haven't authenticated, but are required to, give up. */
1106
1107 if (require_auth == OK && !smtp_authenticated)
1108 {
1109 set_errno_nohost(addrlist, ERRNO_AUTHFAIL,
1110 string_sprintf("authentication required but %s", fail_reason), DEFER,
1111 FALSE);
1112 return DEFER;
1113 }
1114
1115 return OK;
1116 }
1117
1118
1119 /* Construct AUTH appendix string for MAIL TO */
1120 /*
1121 Arguments
1122 buffer to build string
1123 addrlist chain of potential addresses to deliver
1124 ob transport options
1125
1126 Globals smtp_authenticated
1127 client_authenticated_sender
1128 Return True on error, otherwise buffer has (possibly empty) terminated string
1129 */
1130
1131 BOOL
1132 smtp_mail_auth_str(uschar *buffer, unsigned bufsize, address_item *addrlist,
1133 smtp_transport_options_block *ob)
1134 {
1135 uschar *local_authenticated_sender = authenticated_sender;
1136
1137 #ifdef notdef
1138 debug_printf("smtp_mail_auth_str: as<%s> os<%s> SA<%s>\n", authenticated_sender, ob->authenticated_sender, smtp_authenticated?"Y":"N");
1139 #endif
1140
1141 if (ob->authenticated_sender != NULL)
1142 {
1143 uschar *new = expand_string(ob->authenticated_sender);
1144 if (new == NULL)
1145 {
1146 if (!expand_string_forcedfail)
1147 {
1148 uschar *message = string_sprintf("failed to expand "
1149 "authenticated_sender: %s", expand_string_message);
1150 set_errno_nohost(addrlist, ERRNO_EXPANDFAIL, message, DEFER, FALSE);
1151 return TRUE;
1152 }
1153 }
1154 else if (new[0] != 0) local_authenticated_sender = new;
1155 }
1156
1157 /* Add the authenticated sender address if present */
1158
1159 if ((smtp_authenticated || ob->authenticated_sender_force) &&
1160 local_authenticated_sender != NULL)
1161 {
1162 string_format(buffer, bufsize, " AUTH=%s",
1163 auth_xtextencode(local_authenticated_sender,
1164 Ustrlen(local_authenticated_sender)));
1165 client_authenticated_sender = string_copy(local_authenticated_sender);
1166 }
1167 else
1168 *buffer= 0;
1169
1170 return FALSE;
1171 }
1172
1173
1174
1175 #ifdef EXPERIMENTAL_DANE
1176 /* Lookup TLSA record for host/port.
1177 Return: OK success with dnssec; DANE mode
1178 DEFER Do not use this host now, may retry later
1179 FAIL_FORCED No TLSA record; DANE not usable
1180 FAIL Do not use this connection
1181 */
1182
1183 int
1184 tlsa_lookup(const host_item * host, dns_answer * dnsa, BOOL dane_required)
1185 {
1186 /* move this out to host.c given the similarity to dns_lookup() ? */
1187 uschar buffer[300];
1188 const uschar * fullname = buffer;
1189 int rc;
1190 BOOL sec;
1191
1192 /* TLSA lookup string */
1193 (void)sprintf(CS buffer, "_%d._tcp.%.256s", host->port, host->name);
1194
1195 rc = dns_lookup(dnsa, buffer, T_TLSA, &fullname);
1196 sec = dns_is_secure(dnsa);
1197 DEBUG(D_transport)
1198 debug_printf("TLSA lookup ret %d %sDNSSEC\n", rc, sec ? "" : "not ");
1199
1200 switch (rc)
1201 {
1202 case DNS_SUCCEED:
1203 if (sec) return OK;
1204
1205 log_write(0, LOG_MAIN, "DANE error: TLSA lookup not DNSSEC");
1206 /*FALLTHROUGH*/
1207 case DNS_AGAIN:
1208 return DEFER; /* just defer this TLS'd conn */
1209
1210 case DNS_NODATA: /* no TLSA RR for this lookup */
1211 case DNS_NOMATCH: /* no records at all for this lookup */
1212 return dane_required ? FAIL : FAIL_FORCED;
1213
1214 default:
1215 case DNS_FAIL:
1216 return dane_required ? FAIL : DEFER;
1217 }
1218 }
1219 #endif
1220
1221
1222
1223 typedef struct smtp_compare_s
1224 {
1225 uschar *current_sender_address;
1226 struct transport_instance *tblock;
1227 } smtp_compare_t;
1228
1229
1230 /* Create a unique string that identifies this message, it is based on
1231 sender_address, helo_data and tls_certificate if enabled.
1232 */
1233
1234 static uschar *
1235 smtp_local_identity(uschar * sender, struct transport_instance * tblock)
1236 {
1237 address_item * addr1;
1238 uschar * if1 = US"";
1239 uschar * helo1 = US"";
1240 #ifdef SUPPORT_TLS
1241 uschar * tlsc1 = US"";
1242 #endif
1243 uschar * save_sender_address = sender_address;
1244 uschar * local_identity = NULL;
1245 smtp_transport_options_block * ob =
1246 (smtp_transport_options_block *)tblock->options_block;
1247
1248 sender_address = sender;
1249
1250 addr1 = deliver_make_addr (sender, TRUE);
1251 deliver_set_expansions(addr1);
1252
1253 if (ob->interface)
1254 if1 = expand_string(ob->interface);
1255
1256 if (ob->helo_data)
1257 helo1 = expand_string(ob->helo_data);
1258
1259 #ifdef SUPPORT_TLS
1260 if (ob->tls_certificate)
1261 tlsc1 = expand_string(ob->tls_certificate);
1262 local_identity = string_sprintf ("%s^%s^%s", if1, helo1, tlsc1);
1263 #else
1264 local_identity = string_sprintf ("%s^%s", if1, helo1);
1265 #endif
1266
1267 deliver_set_expansions(NULL);
1268 sender_address = save_sender_address;
1269
1270 return local_identity;
1271 }
1272
1273
1274
1275 /* This routine is a callback that is called from transport_check_waiting.
1276 This function will evaluate the incoming message versus the previous
1277 message. If the incoming message is using a different local identity then
1278 we will veto this new message. */
1279
1280 static BOOL
1281 smtp_are_same_identities(uschar * message_id, smtp_compare_t * s_compare)
1282 {
1283 uschar * message_local_identity,
1284 * current_local_identity,
1285 * new_sender_address;
1286
1287 current_local_identity =
1288 smtp_local_identity(s_compare->current_sender_address, s_compare->tblock);
1289
1290 if (!(new_sender_address = deliver_get_sender_address(message_id)))
1291 return 0;
1292
1293 message_local_identity =
1294 smtp_local_identity(new_sender_address, s_compare->tblock);
1295
1296 return Ustrcmp(current_local_identity, message_local_identity) == 0;
1297 }
1298
1299
1300
1301 static uschar
1302 ehlo_response(uschar * buf, uschar checks)
1303 {
1304 size_t bsize = Ustrlen(buf);
1305
1306 #ifdef SUPPORT_TLS
1307 if ( checks & PEER_OFFERED_TLS
1308 && pcre_exec(regex_STARTTLS, NULL, CS buf, bsize, 0, PCRE_EOPT, NULL, 0) < 0)
1309 checks &= ~PEER_OFFERED_TLS;
1310 #endif
1311
1312 if ( checks & PEER_OFFERED_IGNQ
1313 && pcre_exec(regex_IGNOREQUOTA, NULL, CS buf, bsize, 0,
1314 PCRE_EOPT, NULL, 0) < 0)
1315 checks &= ~PEER_OFFERED_IGNQ;
1316
1317 if ( checks & PEER_OFFERED_CHUNKING
1318 && pcre_exec(regex_CHUNKING, NULL, CS buf, bsize, 0, PCRE_EOPT, NULL, 0) < 0)
1319 checks &= ~PEER_OFFERED_CHUNKING;
1320
1321 #ifndef DISABLE_PRDR
1322 if ( checks & PEER_OFFERED_PRDR
1323 && pcre_exec(regex_PRDR, NULL, CS buf, bsize, 0, PCRE_EOPT, NULL, 0) < 0)
1324 checks &= ~PEER_OFFERED_PRDR;
1325 #endif
1326
1327 #ifdef SUPPORT_I18N
1328 if ( checks & PEER_OFFERED_UTF8
1329 && pcre_exec(regex_UTF8, NULL, CS buf, bsize, 0, PCRE_EOPT, NULL, 0) < 0)
1330 checks &= ~PEER_OFFERED_UTF8;
1331 #endif
1332
1333 if ( checks & PEER_OFFERED_DSN
1334 && pcre_exec(regex_DSN, NULL, CS buf, bsize, 0, PCRE_EOPT, NULL, 0) < 0)
1335 checks &= ~PEER_OFFERED_DSN;
1336
1337 if ( checks & PEER_OFFERED_PIPE
1338 && pcre_exec(regex_PIPELINING, NULL, CS buf, bsize, 0,
1339 PCRE_EOPT, NULL, 0) < 0)
1340 checks &= ~PEER_OFFERED_PIPE;
1341
1342 if ( checks & PEER_OFFERED_SIZE
1343 && pcre_exec(regex_SIZE, NULL, CS buf, bsize, 0, PCRE_EOPT, NULL, 0) < 0)
1344 checks &= ~PEER_OFFERED_SIZE;
1345
1346 return checks;
1347 }
1348
1349
1350
1351 /* Callback for emitting a BDAT data chunk header.
1352
1353 If given a nonzero size, first flush any buffered SMTP commands
1354 then emit the command.
1355
1356 Reap previous SMTP command responses if requested, and always reap
1357 the response from a previous BDAT command.
1358
1359 Args:
1360 tctx transport context
1361 chunk_size value for SMTP BDAT command
1362 flags
1363 tc_chunk_last add LAST option to SMTP BDAT command
1364 tc_reap_prev reap response to previous SMTP commands
1365
1366 Returns: OK or ERROR
1367 */
1368
1369 static int
1370 smtp_chunk_cmd_callback(transport_ctx * tctx, unsigned chunk_size,
1371 unsigned flags)
1372 {
1373 smtp_transport_options_block * ob =
1374 (smtp_transport_options_block *)(tctx->tblock->options_block);
1375 smtp_context * sx = tctx->smtp_context;
1376 int cmd_count = 0;
1377 int prev_cmd_count;
1378
1379 /* Write SMTP chunk header command. If not reaping responses, note that
1380 there may be more writes (like, the chunk data) done soon. */
1381
1382 if (chunk_size > 0)
1383 {
1384 if((cmd_count = smtp_write_command(&sx->outblock,
1385 flags & tc_reap_prev ? SCMD_FLUSH : SCMD_MORE,
1386 "BDAT %u%s\r\n", chunk_size, flags & tc_chunk_last ? " LAST" : "")
1387 ) < 0) return ERROR;
1388 if (flags & tc_chunk_last)
1389 data_command = string_copy(big_buffer); /* Save for later error message */
1390 }
1391
1392 prev_cmd_count = cmd_count += sx->cmd_count;
1393
1394 /* Reap responses for any previous, but not one we just emitted */
1395
1396 if (chunk_size > 0)
1397 prev_cmd_count--;
1398 if (sx->pending_BDAT)
1399 prev_cmd_count--;
1400
1401 if (flags & tc_reap_prev && prev_cmd_count > 0)
1402 {
1403 DEBUG(D_transport) debug_printf("look for %d responses"
1404 " for previous pipelined cmds\n", prev_cmd_count);
1405
1406 switch(sync_responses(sx, prev_cmd_count, 0))
1407 {
1408 case 1: /* 2xx (only) => OK */
1409 case 3: sx->good_RCPT = TRUE; /* 2xx & 5xx => OK & progress made */
1410 case 2: sx->completed_addr = TRUE; /* 5xx (only) => progress made */
1411 case 0: break; /* No 2xx or 5xx, but no probs */
1412
1413 case -1: /* Timeout on RCPT */
1414 default: return ERROR; /* I/O error, or any MAIL/DATA error */
1415 }
1416 cmd_count = 1;
1417 if (!sx->pending_BDAT)
1418 pipelining_active = FALSE;
1419 }
1420
1421 /* Reap response for an outstanding BDAT */
1422
1423 if (sx->pending_BDAT)
1424 {
1425 DEBUG(D_transport) debug_printf("look for one response for BDAT\n");
1426
1427 if (!smtp_read_response(&sx->inblock, sx->buffer, sizeof(sx->buffer), '2',
1428 ob->command_timeout))
1429 {
1430 if (errno == 0 && sx->buffer[0] == '4')
1431 {
1432 errno = ERRNO_DATA4XX; /*XXX does this actually get used? */
1433 sx->addrlist->more_errno |=
1434 ((sx->buffer[1] - '0')*10 + sx->buffer[2] - '0') << 8;
1435 }
1436 return ERROR;
1437 }
1438 cmd_count--;
1439 sx->pending_BDAT = FALSE;
1440 pipelining_active = FALSE;
1441 }
1442 else if (chunk_size > 0)
1443 sx->pending_BDAT = TRUE;
1444
1445
1446 sx->cmd_count = cmd_count;
1447 return OK;
1448 }
1449
1450
1451
1452 /*************************************************
1453 * Make connection for given message *
1454 *************************************************/
1455
1456 /*
1457 Arguments:
1458 ctx connection context
1459 suppress_tls if TRUE, don't attempt a TLS connection - this is set for
1460 a second attempt after TLS initialization fails
1461
1462 Returns: OK - the connection was made and the delivery attempted;
1463 fd is set in the conn context, tls_out set up.
1464 DEFER - the connection could not be made, or something failed
1465 while setting up the SMTP session, or there was a
1466 non-message-specific error, such as a timeout.
1467 ERROR - helo_data or add_headers or authenticated_sender is
1468 specified for this transport, and the string failed
1469 to expand
1470 */
1471 int
1472 smtp_setup_conn(smtp_context * sx, BOOL suppress_tls)
1473 {
1474 #if defined(SUPPORT_TLS) && defined(EXPERIMENTAL_DANE)
1475 dns_answer tlsa_dnsa;
1476 #endif
1477 BOOL pass_message = FALSE;
1478 uschar * message = NULL;
1479 int yield = OK;
1480 int rc;
1481
1482 sx->ob = (smtp_transport_options_block *) sx->tblock->options_block;
1483
1484 sx->lmtp = strcmpic(sx->ob->protocol, US"lmtp") == 0;
1485 sx->smtps = strcmpic(sx->ob->protocol, US"smtps") == 0;
1486 sx->ok = FALSE;
1487 sx->send_rset = TRUE;
1488 sx->send_quit = TRUE;
1489 sx->setting_up = TRUE;
1490 sx->esmtp = TRUE;
1491 sx->esmtp_sent = FALSE;
1492 #ifdef SUPPORT_I18N
1493 sx->utf8_needed = FALSE;
1494 #endif
1495 sx->dsn_all_lasthop = TRUE;
1496 #if defined(SUPPORT_TLS) && defined(EXPERIMENTAL_DANE)
1497 sx->dane = FALSE;
1498 sx->dane_required = verify_check_given_host(&sx->ob->hosts_require_dane, sx->host) == OK;
1499 #endif
1500
1501 if ((sx->max_rcpt = sx->tblock->max_addresses) == 0) sx->max_rcpt = 999999;
1502 sx->peer_offered = 0;
1503 sx->igquotstr = US"";
1504 if (!sx->helo_data) sx->helo_data = sx->ob->helo_data;
1505 #ifdef EXPERIMENTAL_DSN_INFO
1506 sx->smtp_greeting = NULL;
1507 sx->helo_response = NULL;
1508 #endif
1509
1510 smtp_command = US"initial connection";
1511 sx->buffer[0] = '\0';
1512
1513 /* Set up the buffer for reading SMTP response packets. */
1514
1515 sx->inblock.buffer = sx->inbuffer;
1516 sx->inblock.buffersize = sizeof(sx->inbuffer);
1517 sx->inblock.ptr = sx->inbuffer;
1518 sx->inblock.ptrend = sx->inbuffer;
1519
1520 /* Set up the buffer for holding SMTP commands while pipelining */
1521
1522 sx->outblock.buffer = sx->outbuffer;
1523 sx->outblock.buffersize = sizeof(sx->outbuffer);
1524 sx->outblock.ptr = sx->outbuffer;
1525 sx->outblock.cmd_count = 0;
1526 sx->outblock.authenticating = FALSE;
1527
1528 /* Reset the parameters of a TLS session. */
1529
1530 tls_out.bits = 0;
1531 tls_out.cipher = NULL; /* the one we may use for this transport */
1532 tls_out.ourcert = NULL;
1533 tls_out.peercert = NULL;
1534 tls_out.peerdn = NULL;
1535 #if defined(SUPPORT_TLS) && !defined(USE_GNUTLS)
1536 tls_out.sni = NULL;
1537 #endif
1538 tls_out.ocsp = OCSP_NOT_REQ;
1539
1540 /* Flip the legacy TLS-related variables over to the outbound set in case
1541 they're used in the context of the transport. Don't bother resetting
1542 afterward (when being used by a transport) as we're in a subprocess.
1543 For verify, unflipped once the callout is dealt with */
1544
1545 tls_modify_variables(&tls_out);
1546
1547 #ifndef SUPPORT_TLS
1548 if (sx->smtps)
1549 {
1550 set_errno_nohost(sx->addrlist, ERRNO_TLSFAILURE, US"TLS support not available",
1551 DEFER, FALSE);
1552 return ERROR;
1553 }
1554 #endif
1555
1556 /* Make a connection to the host if this isn't a continued delivery, and handle
1557 the initial interaction and HELO/EHLO/LHLO. Connect timeout errors are handled
1558 specially so they can be identified for retries. */
1559
1560 if (!continue_hostname)
1561 {
1562 if (sx->verify)
1563 HDEBUG(D_verify) debug_printf("interface=%s port=%d\n", sx->interface, sx->port);
1564
1565 /* Get the actual port the connection will use, into sx->host */
1566
1567 smtp_port_for_connect(sx->host, sx->port);
1568
1569 #if defined(SUPPORT_TLS) && defined(EXPERIMENTAL_DANE)
1570 /* Do TLSA lookup for DANE */
1571 {
1572 tls_out.dane_verified = FALSE;
1573 tls_out.tlsa_usage = 0;
1574
1575 if (sx->host->dnssec == DS_YES)
1576 {
1577 if( sx->dane_required
1578 || verify_check_given_host(&sx->ob->hosts_try_dane, sx->host) == OK
1579 )
1580 switch (rc = tlsa_lookup(sx->host, &tlsa_dnsa, sx->dane_required))
1581 {
1582 case OK: sx->dane = TRUE;
1583 sx->ob->tls_tempfail_tryclear = FALSE;
1584 break;
1585 case FAIL_FORCED: break;
1586 default: set_errno_nohost(sx->addrlist, ERRNO_DNSDEFER,
1587 string_sprintf("DANE error: tlsa lookup %s",
1588 rc == DEFER ? "DEFER" : "FAIL"),
1589 rc, FALSE);
1590 return rc;
1591 }
1592 }
1593 else if (sx->dane_required)
1594 {
1595 set_errno_nohost(sx->addrlist, ERRNO_DNSDEFER,
1596 string_sprintf("DANE error: %s lookup not DNSSEC", sx->host->name),
1597 FAIL, FALSE);
1598 return FAIL;
1599 }
1600 }
1601 #endif /*DANE*/
1602
1603 /* Make the TCP connection */
1604
1605 sx->inblock.sock = sx->outblock.sock =
1606 smtp_connect(sx->host, sx->host_af, sx->interface,
1607 sx->ob->connect_timeout, sx->tblock);
1608
1609 if (sx->inblock.sock < 0)
1610 {
1611 uschar * msg = NULL;
1612 if (sx->verify)
1613 {
1614 msg = US strerror(errno);
1615 HDEBUG(D_verify) debug_printf("connect: %s\n", msg);
1616 }
1617 set_errno_nohost(sx->addrlist,
1618 errno == ETIMEDOUT ? ERRNO_CONNECTTIMEOUT : errno,
1619 sx->verify ? string_sprintf("could not connect: %s", msg)
1620 : NULL,
1621 DEFER, FALSE);
1622 sx->send_quit = FALSE;
1623 return DEFER;
1624 }
1625
1626 /* Expand the greeting message while waiting for the initial response. (Makes
1627 sense if helo_data contains ${lookup dnsdb ...} stuff). The expansion is
1628 delayed till here so that $sending_interface and $sending_port are set. */
1629
1630 if (sx->helo_data)
1631 if (!(sx->helo_data = expand_string(sx->helo_data)))
1632 if (sx->verify)
1633 log_write(0, LOG_MAIN|LOG_PANIC,
1634 "<%s>: failed to expand transport's helo_data value for callout: %s",
1635 sx->addrlist->address, expand_string_message);
1636
1637 #ifdef SUPPORT_I18N
1638 if (sx->helo_data)
1639 {
1640 expand_string_message = NULL;
1641 if ((sx->helo_data = string_domain_utf8_to_alabel(sx->helo_data,
1642 &expand_string_message)),
1643 expand_string_message)
1644 if (sx->verify)
1645 log_write(0, LOG_MAIN|LOG_PANIC,
1646 "<%s>: failed to expand transport's helo_data value for callout: %s",
1647 sx->addrlist->address, expand_string_message);
1648 else
1649 sx->helo_data = NULL;
1650 }
1651 #endif
1652
1653 /* The first thing is to wait for an initial OK response. The dreaded "goto"
1654 is nevertheless a reasonably clean way of programming this kind of logic,
1655 where you want to escape on any error. */
1656
1657 if (!sx->smtps)
1658 {
1659 BOOL good_response;
1660
1661 #ifdef TCP_QUICKACK
1662 (void) setsockopt(sx->inblock.sock, IPPROTO_TCP, TCP_QUICKACK, US &off, sizeof(off));
1663 #endif
1664 good_response = smtp_read_response(&sx->inblock, sx->buffer, sizeof(sx->buffer),
1665 '2', sx->ob->command_timeout);
1666 #ifdef EXPERIMENTAL_DSN_INFO
1667 sx->smtp_greeting = string_copy(sx->buffer);
1668 #endif
1669 if (!good_response) goto RESPONSE_FAILED;
1670
1671 #ifndef DISABLE_EVENT
1672 {
1673 uschar * s;
1674 lookup_dnssec_authenticated = sx->host->dnssec==DS_YES ? US"yes"
1675 : sx->host->dnssec==DS_NO ? US"no" : NULL;
1676 s = event_raise(sx->tblock->event_action, US"smtp:connect", sx->buffer);
1677 if (s)
1678 {
1679 set_errno_nohost(sx->addrlist, ERRNO_EXPANDFAIL,
1680 string_sprintf("deferred by smtp:connect event expansion: %s", s),
1681 DEFER, FALSE);
1682 yield = DEFER;
1683 goto SEND_QUIT;
1684 }
1685 }
1686 #endif
1687
1688 /* Now check if the helo_data expansion went well, and sign off cleanly if
1689 it didn't. */
1690
1691 if (!sx->helo_data)
1692 {
1693 message = string_sprintf("failed to expand helo_data: %s",
1694 expand_string_message);
1695 set_errno_nohost(sx->addrlist, ERRNO_EXPANDFAIL, message, DEFER, FALSE);
1696 yield = DEFER;
1697 goto SEND_QUIT;
1698 }
1699 }
1700
1701 /** Debugging without sending a message
1702 sx->addrlist->transport_return = DEFER;
1703 goto SEND_QUIT;
1704 **/
1705
1706 /* Errors that occur after this point follow an SMTP command, which is
1707 left in big_buffer by smtp_write_command() for use in error messages. */
1708
1709 smtp_command = big_buffer;
1710
1711 /* Tell the remote who we are...
1712
1713 February 1998: A convention has evolved that ESMTP-speaking MTAs include the
1714 string "ESMTP" in their greeting lines, so make Exim send EHLO if the
1715 greeting is of this form. The assumption was that the far end supports it
1716 properly... but experience shows that there are some that give 5xx responses,
1717 even though the banner includes "ESMTP" (there's a bloody-minded one that
1718 says "ESMTP not spoken here"). Cope with that case.
1719
1720 September 2000: Time has passed, and it seems reasonable now to always send
1721 EHLO at the start. It is also convenient to make the change while installing
1722 the TLS stuff.
1723
1724 July 2003: Joachim Wieland met a broken server that advertises "PIPELINING"
1725 but times out after sending MAIL FROM, RCPT TO and DATA all together. There
1726 would be no way to send out the mails, so there is now a host list
1727 "hosts_avoid_esmtp" that disables ESMTP for special hosts and solves the
1728 PIPELINING problem as well. Maybe it can also be useful to cure other
1729 problems with broken servers.
1730
1731 Exim originally sent "Helo" at this point and ran for nearly a year that way.
1732 Then somebody tried it with a Microsoft mailer... It seems that all other
1733 mailers use upper case for some reason (the RFC is quite clear about case
1734 independence) so, for peace of mind, I gave in. */
1735
1736 sx->esmtp = verify_check_given_host(&sx->ob->hosts_avoid_esmtp, sx->host) != OK;
1737
1738 /* Alas; be careful, since this goto is not an error-out, so conceivably
1739 we might set data between here and the target which we assume to exist
1740 and be usable. I can see this coming back to bite us. */
1741 #ifdef SUPPORT_TLS
1742 if (sx->smtps)
1743 {
1744 smtp_peer_options |= PEER_OFFERED_TLS;
1745 suppress_tls = FALSE;
1746 sx->ob->tls_tempfail_tryclear = FALSE;
1747 smtp_command = US"SSL-on-connect";
1748 goto TLS_NEGOTIATE;
1749 }
1750 #endif
1751
1752 if (sx->esmtp)
1753 {
1754 if (smtp_write_command(&sx->outblock, SCMD_FLUSH, "%s %s\r\n",
1755 sx->lmtp ? "LHLO" : "EHLO", sx->helo_data) < 0)
1756 goto SEND_FAILED;
1757 sx->esmtp_sent = TRUE;
1758 if (!smtp_read_response(&sx->inblock, sx->buffer, sizeof(sx->buffer), '2',
1759 sx->ob->command_timeout))
1760 {
1761 if (errno != 0 || sx->buffer[0] == 0 || sx->lmtp)
1762 {
1763 #ifdef EXPERIMENTAL_DSN_INFO
1764 sx->helo_response = string_copy(sx->buffer);
1765 #endif
1766 goto RESPONSE_FAILED;
1767 }
1768 sx->esmtp = FALSE;
1769 }
1770 #ifdef EXPERIMENTAL_DSN_INFO
1771 sx->helo_response = string_copy(sx->buffer);
1772 #endif
1773 }
1774 else
1775 DEBUG(D_transport)
1776 debug_printf("not sending EHLO (host matches hosts_avoid_esmtp)\n");
1777
1778 if (!sx->esmtp)
1779 {
1780 BOOL good_response;
1781 int n = sizeof(sx->buffer);
1782 uschar * rsp = sx->buffer;
1783
1784 if (sx->esmtp_sent && (n = Ustrlen(sx->buffer)) < sizeof(sx->buffer)/2)
1785 { rsp = sx->buffer + n + 1; n = sizeof(sx->buffer) - n; }
1786
1787 if (smtp_write_command(&sx->outblock, SCMD_FLUSH, "HELO %s\r\n", sx->helo_data) < 0)
1788 goto SEND_FAILED;
1789 good_response = smtp_read_response(&sx->inblock, rsp, n,
1790 '2', sx->ob->command_timeout);
1791 #ifdef EXPERIMENTAL_DSN_INFO
1792 sx->helo_response = string_copy(rsp);
1793 #endif
1794 if (!good_response)
1795 {
1796 /* Handle special logging for a closed connection after HELO
1797 when had previously sent EHLO */
1798
1799 if (rsp != sx->buffer && rsp[0] == 0 && (errno == 0 || errno == ECONNRESET))
1800 {
1801 errno = ERRNO_SMTPCLOSED;
1802 goto EHLOHELO_FAILED;
1803 }
1804 Ustrncpy(sx->buffer, rsp, sizeof(sx->buffer)/2);
1805 goto RESPONSE_FAILED;
1806 }
1807 }
1808
1809 sx->peer_offered = smtp_peer_options = 0;
1810
1811 if (sx->esmtp || sx->lmtp)
1812 {
1813 sx->peer_offered = ehlo_response(sx->buffer,
1814 PEER_OFFERED_TLS /* others checked later */
1815 );
1816
1817 /* Set tls_offered if the response to EHLO specifies support for STARTTLS. */
1818
1819 #ifdef SUPPORT_TLS
1820 smtp_peer_options |= sx->peer_offered & PEER_OFFERED_TLS;
1821 #endif
1822 }
1823 }
1824
1825 /* For continuing deliveries down the same channel, having re-exec'd the socket
1826 is the standard input; for a socket held open from verify it is recorded
1827 in the cutthrough context block. Either way we don't need to redo EHLO here
1828 (but may need to do so for TLS - see below).
1829 Set up the pointer to where subsequent commands will be left, for
1830 error messages. Note that smtp_peer_options will have been
1831 set from the command line if they were set in the process that passed the
1832 connection on. */
1833
1834 /*XXX continue case needs to propagate DSN_INFO, prob. in deliver.c
1835 as the continue goes via transport_pass_socket() and doublefork and exec.
1836 It does not wait. Unclear how we keep separate host's responses
1837 separate - we could match up by host ip+port as a bodge. */
1838
1839 else
1840 {
1841 if (cutthrough.fd >= 0 && cutthrough.callout_hold_only)
1842 {
1843 sx->inblock.sock = sx->outblock.sock = cutthrough.fd;
1844 sx->host->port = sx->port = cutthrough.host.port;
1845 }
1846 else
1847 {
1848 sx->inblock.sock = sx->outblock.sock = 0; /* stdin */
1849 sx->host->port = sx->port; /* Record the port that was used */
1850 }
1851 smtp_command = big_buffer;
1852 sx->helo_data = NULL; /* ensure we re-expand ob->helo_data */
1853
1854 /* For a continued connection with TLS being proxied for us, or a
1855 held-open verify connection with TLS, nothing more to do. */
1856
1857 if ( continue_proxy_cipher
1858 || (cutthrough.fd >= 0 && cutthrough.callout_hold_only && cutthrough.is_tls)
1859 )
1860 {
1861 sx->peer_offered = smtp_peer_options;
1862 pipelining_active = !!(smtp_peer_options & PEER_OFFERED_PIPE);
1863 HDEBUG(D_transport) debug_printf("continued connection, %s TLS\n",
1864 continue_proxy_cipher ? "proxied" : "verify conn with");
1865 return OK;
1866 }
1867 HDEBUG(D_transport) debug_printf("continued connection, no TLS\n");
1868 }
1869
1870 /* If TLS is available on this connection, whether continued or not, attempt to
1871 start up a TLS session, unless the host is in hosts_avoid_tls. If successful,
1872 send another EHLO - the server may give a different answer in secure mode. We
1873 use a separate buffer for reading the response to STARTTLS so that if it is
1874 negative, the original EHLO data is available for subsequent analysis, should
1875 the client not be required to use TLS. If the response is bad, copy the buffer
1876 for error analysis. */
1877
1878 #ifdef SUPPORT_TLS
1879 if ( smtp_peer_options & PEER_OFFERED_TLS
1880 && !suppress_tls
1881 && verify_check_given_host(&sx->ob->hosts_avoid_tls, sx->host) != OK
1882 && ( !sx->verify
1883 || verify_check_given_host(&sx->ob->hosts_verify_avoid_tls, sx->host) != OK
1884 ) )
1885 {
1886 uschar buffer2[4096];
1887 if (smtp_write_command(&sx->outblock, SCMD_FLUSH, "STARTTLS\r\n") < 0)
1888 goto SEND_FAILED;
1889
1890 /* If there is an I/O error, transmission of this message is deferred. If
1891 there is a temporary rejection of STARRTLS and tls_tempfail_tryclear is
1892 false, we also defer. However, if there is a temporary rejection of STARTTLS
1893 and tls_tempfail_tryclear is true, or if there is an outright rejection of
1894 STARTTLS, we carry on. This means we will try to send the message in clear,
1895 unless the host is in hosts_require_tls (tested below). */
1896
1897 if (!smtp_read_response(&sx->inblock, buffer2, sizeof(buffer2), '2',
1898 sx->ob->command_timeout))
1899 {
1900 if ( errno != 0
1901 || buffer2[0] == 0
1902 || (buffer2[0] == '4' && !sx->ob->tls_tempfail_tryclear)
1903 )
1904 {
1905 Ustrncpy(sx->buffer, buffer2, sizeof(sx->buffer));
1906 sx->buffer[sizeof(sx->buffer)-1] = '\0';
1907 goto RESPONSE_FAILED;
1908 }
1909 }
1910
1911 /* STARTTLS accepted: try to negotiate a TLS session. */
1912
1913 else
1914 TLS_NEGOTIATE:
1915 {
1916 address_item * addr;
1917 uschar * errstr;
1918 int rc = tls_client_start(sx->inblock.sock, sx->host, sx->addrlist, sx->tblock,
1919 # ifdef EXPERIMENTAL_DANE
1920 sx->dane ? &tlsa_dnsa : NULL,
1921 # endif
1922 &errstr);
1923
1924 /* TLS negotiation failed; give an error. From outside, this function may
1925 be called again to try in clear on a new connection, if the options permit
1926 it for this host. */
1927
1928 if (rc != OK)
1929 {
1930 # ifdef EXPERIMENTAL_DANE
1931 if (sx->dane) log_write(0, LOG_MAIN,
1932 "DANE attempt failed; TLS connection to %s [%s]: %s",
1933 sx->host->name, sx->host->address, errstr);
1934 # endif
1935
1936 errno = ERRNO_TLSFAILURE;
1937 message = string_sprintf("TLS session: %s", errstr);
1938 sx->send_quit = FALSE;
1939 goto TLS_FAILED;
1940 }
1941
1942 /* TLS session is set up */
1943
1944 smtp_peer_options_wrap = smtp_peer_options;
1945 for (addr = sx->addrlist; addr; addr = addr->next)
1946 if (addr->transport_return == PENDING_DEFER)
1947 {
1948 addr->cipher = tls_out.cipher;
1949 addr->ourcert = tls_out.ourcert;
1950 addr->peercert = tls_out.peercert;
1951 addr->peerdn = tls_out.peerdn;
1952 addr->ocsp = tls_out.ocsp;
1953 }
1954 }
1955 }
1956
1957 /* if smtps, we'll have smtp_command set to something else; always safe to
1958 reset it here. */
1959 smtp_command = big_buffer;
1960
1961 /* If we started TLS, redo the EHLO/LHLO exchange over the secure channel. If
1962 helo_data is null, we are dealing with a connection that was passed from
1963 another process, and so we won't have expanded helo_data above. We have to
1964 expand it here. $sending_ip_address and $sending_port are set up right at the
1965 start of the Exim process (in exim.c). */
1966
1967 if (tls_out.active >= 0)
1968 {
1969 char *greeting_cmd;
1970 BOOL good_response;
1971
1972 if (!sx->helo_data && !(sx->helo_data = expand_string(sx->ob->helo_data)))
1973 {
1974 uschar *message = string_sprintf("failed to expand helo_data: %s",
1975 expand_string_message);
1976 set_errno_nohost(sx->addrlist, ERRNO_EXPANDFAIL, message, DEFER, FALSE);
1977 yield = DEFER;
1978 goto SEND_QUIT;
1979 }
1980
1981 /* For SMTPS we need to wait for the initial OK response. */
1982 if (sx->smtps)
1983 {
1984 good_response = smtp_read_response(&sx->inblock, sx->buffer, sizeof(sx->buffer),
1985 '2', sx->ob->command_timeout);
1986 #ifdef EXPERIMENTAL_DSN_INFO
1987 sx->smtp_greeting = string_copy(sx->buffer);
1988 #endif
1989 if (!good_response) goto RESPONSE_FAILED;
1990 }
1991
1992 if (sx->esmtp)
1993 greeting_cmd = "EHLO";
1994 else
1995 {
1996 greeting_cmd = "HELO";
1997 DEBUG(D_transport)
1998 debug_printf("not sending EHLO (host matches hosts_avoid_esmtp)\n");
1999 }
2000
2001 if (smtp_write_command(&sx->outblock, SCMD_FLUSH, "%s %s\r\n",
2002 sx->lmtp ? "LHLO" : greeting_cmd, sx->helo_data) < 0)
2003 goto SEND_FAILED;
2004 good_response = smtp_read_response(&sx->inblock, sx->buffer, sizeof(sx->buffer),
2005 '2', sx->ob->command_timeout);
2006 #ifdef EXPERIMENTAL_DSN_INFO
2007 sx->helo_response = string_copy(sx->buffer);
2008 #endif
2009 if (!good_response) goto RESPONSE_FAILED;
2010 smtp_peer_options = 0;
2011 }
2012
2013 /* If the host is required to use a secure channel, ensure that we
2014 have one. */
2015
2016 else if ( sx->smtps
2017 # ifdef EXPERIMENTAL_DANE
2018 || sx->dane
2019 # endif
2020 || verify_check_given_host(&sx->ob->hosts_require_tls, sx->host) == OK
2021 )
2022 {
2023 errno = ERRNO_TLSREQUIRED;
2024 message = string_sprintf("a TLS session is required, but %s",
2025 smtp_peer_options & PEER_OFFERED_TLS
2026 ? "an attempt to start TLS failed" : "the server did not offer TLS support");
2027 goto TLS_FAILED;
2028 }
2029 #endif /*SUPPORT_TLS*/
2030
2031 /* If TLS is active, we have just started it up and re-done the EHLO command,
2032 so its response needs to be analyzed. If TLS is not active and this is a
2033 continued session down a previously-used socket, we haven't just done EHLO, so
2034 we skip this. */
2035
2036 if (continue_hostname == NULL
2037 #ifdef SUPPORT_TLS
2038 || tls_out.active >= 0
2039 #endif
2040 )
2041 {
2042 if (sx->esmtp || sx->lmtp)
2043 {
2044 sx->peer_offered = ehlo_response(sx->buffer,
2045 0 /* no TLS */
2046 | (sx->lmtp && sx->ob->lmtp_ignore_quota ? PEER_OFFERED_IGNQ : 0)
2047 | PEER_OFFERED_CHUNKING
2048 | PEER_OFFERED_PRDR
2049 #ifdef SUPPORT_I18N
2050 | (sx->addrlist->prop.utf8_msg ? PEER_OFFERED_UTF8 : 0)
2051 /*XXX if we hand peercaps on to continued-conn processes,
2052 must not depend on this addr */
2053 #endif
2054 | PEER_OFFERED_DSN
2055 | PEER_OFFERED_PIPE
2056 | (sx->ob->size_addition >= 0 ? PEER_OFFERED_SIZE : 0)
2057 );
2058
2059 /* Set for IGNOREQUOTA if the response to LHLO specifies support and the
2060 lmtp_ignore_quota option was set. */
2061
2062 sx->igquotstr = sx->peer_offered & PEER_OFFERED_IGNQ ? US" IGNOREQUOTA" : US"";
2063
2064 /* If the response to EHLO specified support for the SIZE parameter, note
2065 this, provided size_addition is non-negative. */
2066
2067 smtp_peer_options |= sx->peer_offered & PEER_OFFERED_SIZE;
2068
2069 /* Note whether the server supports PIPELINING. If hosts_avoid_esmtp matched
2070 the current host, esmtp will be false, so PIPELINING can never be used. If
2071 the current host matches hosts_avoid_pipelining, don't do it. */
2072
2073 if ( sx->peer_offered & PEER_OFFERED_PIPE
2074 && verify_check_given_host(&sx->ob->hosts_avoid_pipelining, sx->host) != OK)
2075 smtp_peer_options |= PEER_OFFERED_PIPE;
2076
2077 DEBUG(D_transport) debug_printf("%susing PIPELINING\n",
2078 smtp_peer_options & PEER_OFFERED_PIPE ? "" : "not ");
2079
2080 if ( sx->peer_offered & PEER_OFFERED_CHUNKING
2081 && verify_check_given_host(&sx->ob->hosts_try_chunking, sx->host) != OK)
2082 sx->peer_offered &= ~PEER_OFFERED_CHUNKING;
2083
2084 if (sx->peer_offered & PEER_OFFERED_CHUNKING)
2085 {DEBUG(D_transport) debug_printf("CHUNKING usable\n");}
2086
2087 #ifndef DISABLE_PRDR
2088 if ( sx->peer_offered & PEER_OFFERED_PRDR
2089 && verify_check_given_host(&sx->ob->hosts_try_prdr, sx->host) != OK)
2090 sx->peer_offered &= ~PEER_OFFERED_PRDR;
2091
2092 if (sx->peer_offered & PEER_OFFERED_PRDR)
2093 {DEBUG(D_transport) debug_printf("PRDR usable\n");}
2094 #endif
2095
2096 /* Note if the server supports DSN */
2097 smtp_peer_options |= sx->peer_offered & PEER_OFFERED_DSN;
2098 DEBUG(D_transport) debug_printf("%susing DSN\n",
2099 sx->peer_offered & PEER_OFFERED_DSN ? "" : "not ");
2100
2101 /* Note if the response to EHLO specifies support for the AUTH extension.
2102 If it has, check that this host is one we want to authenticate to, and do
2103 the business. The host name and address must be available when the
2104 authenticator's client driver is running. */
2105
2106 switch (yield = smtp_auth(sx->buffer, sizeof(sx->buffer), sx->addrlist, sx->host,
2107 sx->ob, sx->esmtp, &sx->inblock, &sx->outblock))
2108 {
2109 default: goto SEND_QUIT;
2110 case OK: break;
2111 case FAIL_SEND: goto SEND_FAILED;
2112 case FAIL: goto RESPONSE_FAILED;
2113 }
2114 }
2115 }
2116 pipelining_active = !!(smtp_peer_options & PEER_OFFERED_PIPE);
2117
2118 /* The setting up of the SMTP call is now complete. Any subsequent errors are
2119 message-specific. */
2120
2121 sx->setting_up = FALSE;
2122
2123 #ifdef SUPPORT_I18N
2124 if (sx->addrlist->prop.utf8_msg)
2125 {
2126 sx->utf8_needed = !sx->addrlist->prop.utf8_downcvt
2127 && !sx->addrlist->prop.utf8_downcvt_maybe;
2128 DEBUG(D_transport) if (!sx->utf8_needed)
2129 debug_printf("utf8: %s downconvert\n",
2130 sx->addrlist->prop.utf8_downcvt ? "mandatory" : "optional");
2131 }
2132
2133 /* If this is an international message we need the host to speak SMTPUTF8 */
2134 if (sx->utf8_needed && !(sx->peer_offered & PEER_OFFERED_UTF8))
2135 {
2136 errno = ERRNO_UTF8_FWD;
2137 goto RESPONSE_FAILED;
2138 }
2139 #endif
2140
2141 return OK;
2142
2143
2144 {
2145 int code;
2146
2147 RESPONSE_FAILED:
2148 message = NULL;
2149 sx->send_quit = check_response(sx->host, &errno, sx->addrlist->more_errno,
2150 sx->buffer, &code, &message, &pass_message);
2151 goto FAILED;
2152
2153 SEND_FAILED:
2154 code = '4';
2155 message = US string_sprintf("send() to %s [%s] failed: %s",
2156 sx->host->name, sx->host->address, strerror(errno));
2157 sx->send_quit = FALSE;
2158 goto FAILED;
2159
2160 /* This label is jumped to directly when a TLS negotiation has failed,
2161 or was not done for a host for which it is required. Values will be set
2162 in message and errno, and setting_up will always be true. Treat as
2163 a temporary error. */
2164
2165 EHLOHELO_FAILED:
2166 code = '4';
2167 message = string_sprintf("Remote host closed connection in response to %s"
2168 " (EHLO response was: %s)", smtp_command, sx->buffer);
2169 sx->send_quit = FALSE;
2170 goto FAILED;
2171
2172 #ifdef SUPPORT_TLS
2173 TLS_FAILED:
2174 code = '4';
2175 goto FAILED;
2176 #endif
2177
2178 /* The failure happened while setting up the call; see if the failure was
2179 a 5xx response (this will either be on connection, or following HELO - a 5xx
2180 after EHLO causes it to try HELO). If so, fail all addresses, as this host is
2181 never going to accept them. For other errors during setting up (timeouts or
2182 whatever), defer all addresses, and yield DEFER, so that the host is not
2183 tried again for a while. */
2184
2185 FAILED:
2186 sx->ok = FALSE; /* For when reached by GOTO */
2187
2188 yield = code == '5'
2189 #ifdef SUPPORT_I18N
2190 || errno == ERRNO_UTF8_FWD
2191 #endif
2192 ? FAIL : DEFER;
2193
2194 set_errno(sx->addrlist, errno, message, yield, pass_message, sx->host
2195 #ifdef EXPERIMENTAL_DSN_INFO
2196 , sx->smtp_greeting, sx->helo_response
2197 #endif
2198 );
2199 }
2200
2201
2202 SEND_QUIT:
2203
2204 if (sx->send_quit)
2205 (void)smtp_write_command(&sx->outblock, SCMD_FLUSH, "QUIT\r\n");
2206
2207 #ifdef SUPPORT_TLS
2208 tls_close(FALSE, TRUE);
2209 #endif
2210
2211 /* Close the socket, and return the appropriate value, first setting
2212 works because the NULL setting is passed back to the calling process, and
2213 remote_max_parallel is forced to 1 when delivering over an existing connection,
2214 */
2215
2216 HDEBUG(D_transport|D_acl|D_v) debug_printf_indent(" SMTP(close)>>\n");
2217 if (sx->send_quit)
2218 {
2219 shutdown(sx->outblock.sock, SHUT_WR);
2220 if (fcntl(sx->inblock.sock, F_SETFL, O_NONBLOCK) == 0)
2221 for (rc = 16; read(sx->inblock.sock, sx->inbuffer, sizeof(sx->inbuffer)) > 0 && rc > 0;)
2222 rc--; /* drain socket */
2223 sx->send_quit = FALSE;
2224 }
2225 (void)close(sx->inblock.sock);
2226 sx->inblock.sock = sx->outblock.sock = -1;
2227
2228 #ifndef DISABLE_EVENT
2229 (void) event_raise(sx->tblock->event_action, US"tcp:close", NULL);
2230 #endif
2231
2232 continue_transport = NULL;
2233 continue_hostname = NULL;
2234 return yield;
2235 }
2236
2237
2238
2239
2240 /* Create the string of options that will be appended to the MAIL FROM:
2241 in the connection context buffer */
2242
2243 static int
2244 build_mailcmd_options(smtp_context * sx, address_item * addrlist)
2245 {
2246 uschar * p = sx->buffer;
2247 address_item * addr;
2248 int address_count;
2249
2250 *p = 0;
2251
2252 /* If we know the receiving MTA supports the SIZE qualification,
2253 send it, adding something to the message size to allow for imprecision
2254 and things that get added en route. Exim keeps the number of lines
2255 in a message, so we can give an accurate value for the original message, but we
2256 need some additional to handle added headers. (Double "." characters don't get
2257 included in the count.) */
2258
2259 if (sx->peer_offered & PEER_OFFERED_SIZE)
2260 {
2261 /*XXX problem here under spool_files_wireformat?
2262 Or just forget about lines? Or inflate by a fixed proportion? */
2263
2264 sprintf(CS p, " SIZE=%d", message_size+message_linecount+sx->ob->size_addition);
2265 while (*p) p++;
2266 }
2267
2268 #ifndef DISABLE_PRDR
2269 /* If it supports Per-Recipient Data Reponses, and we have omre than one recipient,
2270 request that */
2271
2272 sx->prdr_active = FALSE;
2273 if (sx->peer_offered & PEER_OFFERED_PRDR)
2274 for (addr = addrlist; addr; addr = addr->next)
2275 if (addr->transport_return == PENDING_DEFER)
2276 {
2277 for (addr = addr->next; addr; addr = addr->next)
2278 if (addr->transport_return == PENDING_DEFER)
2279 { /* at least two recipients to send */
2280 sx->prdr_active = TRUE;
2281 sprintf(CS p, " PRDR"); p += 5;
2282 break;
2283 }
2284 break;
2285 }
2286 #endif
2287
2288 #ifdef SUPPORT_I18N
2289 /* If it supports internationalised messages, and this meesage need that,
2290 request it */
2291
2292 if ( sx->peer_offered & PEER_OFFERED_UTF8
2293 && addrlist->prop.utf8_msg
2294 && !addrlist->prop.utf8_downcvt
2295 )
2296 Ustrcpy(p, " SMTPUTF8"), p += 9;
2297 #endif
2298
2299 /* check if all addresses have DSN-lasthop flag; do not send RET and ENVID if so */
2300 for (sx->dsn_all_lasthop = TRUE, addr = addrlist, address_count = 0;
2301 addr && address_count < sx->max_rcpt;
2302 addr = addr->next) if (addr->transport_return == PENDING_DEFER)
2303 {
2304 address_count++;
2305 if (!(addr->dsn_flags & rf_dsnlasthop))
2306 {
2307 sx->dsn_all_lasthop = FALSE;
2308 break;
2309 }
2310 }
2311
2312 /* Add any DSN flags to the mail command */
2313
2314 if (sx->peer_offered & PEER_OFFERED_DSN && !sx->dsn_all_lasthop)
2315 {
2316 if (dsn_ret == dsn_ret_hdrs)
2317 { Ustrcpy(p, " RET=HDRS"); p += 9; }
2318 else if (dsn_ret == dsn_ret_full)
2319 { Ustrcpy(p, " RET=FULL"); p += 9; }
2320
2321 if (dsn_envid)
2322 {
2323 string_format(p, sizeof(sx->buffer) - (p-sx->buffer), " ENVID=%s", dsn_envid);
2324 while (*p) p++;
2325 }
2326 }
2327
2328 /* If an authenticated_sender override has been specified for this transport
2329 instance, expand it. If the expansion is forced to fail, and there was already
2330 an authenticated_sender for this message, the original value will be used.
2331 Other expansion failures are serious. An empty result is ignored, but there is
2332 otherwise no check - this feature is expected to be used with LMTP and other
2333 cases where non-standard addresses (e.g. without domains) might be required. */
2334
2335 if (smtp_mail_auth_str(p, sizeof(sx->buffer) - (p-sx->buffer), addrlist, sx->ob))
2336 return ERROR;
2337
2338 return OK;
2339 }
2340
2341
2342 static void
2343 build_rcptcmd_options(smtp_context * sx, const address_item * addr)
2344 {
2345 uschar * p = sx->buffer;
2346 *p = 0;
2347
2348 /* Add any DSN flags to the rcpt command */
2349
2350 if (sx->peer_offered & PEER_OFFERED_DSN && !(addr->dsn_flags & rf_dsnlasthop))
2351 {
2352 if (addr->dsn_flags & rf_dsnflags)
2353 {
2354 int i;
2355 BOOL first = TRUE;
2356
2357 Ustrcpy(p, " NOTIFY=");
2358 while (*p) p++;
2359 for (i = 0; i < nelem(rf_list); i++) if (addr->dsn_flags & rf_list[i])
2360 {
2361 if (!first) *p++ = ',';
2362 first = FALSE;
2363 Ustrcpy(p, rf_names[i]);
2364 while (*p) p++;
2365 }
2366 }
2367
2368 if (addr->dsn_orcpt)
2369 {
2370 string_format(p, sizeof(sx->buffer) - (p-sx->buffer), " ORCPT=%s",
2371 addr->dsn_orcpt);
2372 while (*p) p++;
2373 }
2374 }
2375 }
2376
2377
2378
2379 /*
2380 Return:
2381 0 good, rcpt results in addr->transport_return (PENDING_OK, DEFER, FAIL)
2382 -1 MAIL response error
2383 -2 any non-MAIL read i/o error
2384 -3 non-MAIL response timeout
2385 -4 internal error; channel still usable
2386 -5 transmit failed
2387 */
2388
2389 int
2390 smtp_write_mail_and_rcpt_cmds(smtp_context * sx, int * yield)
2391 {
2392 address_item * addr;
2393 int address_count;
2394 int rc;
2395
2396 if (build_mailcmd_options(sx, sx->first_addr) != OK)
2397 {
2398 *yield = ERROR;
2399 return -4;
2400 }
2401
2402 /* From here until we send the DATA command, we can make use of PIPELINING
2403 if the server host supports it. The code has to be able to check the responses
2404 at any point, for when the buffer fills up, so we write it totally generally.
2405 When PIPELINING is off, each command written reports that it has flushed the
2406 buffer. */
2407
2408 sx->pending_MAIL = TRUE; /* The block starts with MAIL */
2409
2410 {
2411 uschar * s = sx->from_addr;
2412 #ifdef SUPPORT_I18N
2413 uschar * errstr = NULL;
2414
2415 /* If we must downconvert, do the from-address here. Remember we had to
2416 for the to-addresses (done below), and also (ugly) for re-doing when building
2417 the delivery log line. */
2418
2419 if ( sx->addrlist->prop.utf8_msg
2420 && (sx->addrlist->prop.utf8_downcvt || !(sx->peer_offered & PEER_OFFERED_UTF8))
2421 )
2422 {
2423 if (s = string_address_utf8_to_alabel(s, &errstr), errstr)
2424 {
2425 set_errno_nohost(sx->addrlist, ERRNO_EXPANDFAIL, errstr, DEFER, FALSE);
2426 *yield = ERROR;
2427 return -4;
2428 }
2429 setflag(sx->addrlist, af_utf8_downcvt);
2430 }
2431 #endif
2432
2433 rc = smtp_write_command(&sx->outblock, pipelining_active ? SCMD_BUFFER : SCMD_FLUSH,
2434 "MAIL FROM:<%s>%s\r\n", s, sx->buffer);
2435 }
2436
2437 mail_command = string_copy(big_buffer); /* Save for later error message */
2438
2439 switch(rc)
2440 {
2441 case -1: /* Transmission error */
2442 return -5;
2443
2444 case +1: /* Cmd was sent */
2445 if (!smtp_read_response(&sx->inblock, sx->buffer, sizeof(sx->buffer), '2',
2446 sx->ob->command_timeout))
2447 {
2448 if (errno == 0 && sx->buffer[0] == '4')
2449 {
2450 errno = ERRNO_MAIL4XX;
2451 sx->addrlist->more_errno |= ((sx->buffer[1] - '0')*10 + sx->buffer[2] - '0') << 8;
2452 }
2453 return -1;
2454 }
2455 sx->pending_MAIL = FALSE;
2456 break;
2457
2458 /* otherwise zero: command queued for pipeline */
2459 }
2460
2461 /* Pass over all the relevant recipient addresses for this host, which are the
2462 ones that have status PENDING_DEFER. If we are using PIPELINING, we can send
2463 several before we have to read the responses for those seen so far. This
2464 checking is done by a subroutine because it also needs to be done at the end.
2465 Send only up to max_rcpt addresses at a time, leaving next_addr pointing to
2466 the next one if not all are sent.
2467
2468 In the MUA wrapper situation, we want to flush the PIPELINING buffer for the
2469 last address because we want to abort if any recipients have any kind of
2470 problem, temporary or permanent. We know that all recipient addresses will have
2471 the PENDING_DEFER status, because only one attempt is ever made, and we know
2472 that max_rcpt will be large, so all addresses will be done at once.
2473
2474 For verify we flush the pipeline after any (the only) rcpt address. */
2475
2476 for (addr = sx->first_addr, address_count = 0;
2477 addr && address_count < sx->max_rcpt;
2478 addr = addr->next) if (addr->transport_return == PENDING_DEFER)
2479 {
2480 int count;
2481 BOOL no_flush;
2482 uschar * rcpt_addr;
2483
2484 addr->dsn_aware = sx->peer_offered & PEER_OFFERED_DSN
2485 ? dsn_support_yes : dsn_support_no;
2486
2487 address_count++;
2488 no_flush = pipelining_active && !sx->verify
2489 && (!mua_wrapper || addr->next && address_count < sx->max_rcpt);
2490
2491 build_rcptcmd_options(sx, addr);
2492
2493 /* Now send the RCPT command, and process outstanding responses when
2494 necessary. After a timeout on RCPT, we just end the function, leaving the
2495 yield as OK, because this error can often mean that there is a problem with
2496 just one address, so we don't want to delay the host. */
2497
2498 rcpt_addr = transport_rcpt_address(addr, sx->tblock->rcpt_include_affixes);
2499
2500 #ifdef SUPPORT_I18N
2501 if ( testflag(sx->addrlist, af_utf8_downcvt)
2502 && !(rcpt_addr = string_address_utf8_to_alabel(rcpt_addr, NULL))
2503 )
2504 {
2505 /*XXX could we use a per-address errstr here? Not fail the whole send? */
2506 errno = ERRNO_EXPANDFAIL;
2507 return -5; /*XXX too harsh? */
2508 }
2509 #endif
2510
2511 count = smtp_write_command(&sx->outblock, no_flush ? SCMD_BUFFER : SCMD_FLUSH,
2512 "RCPT TO:<%s>%s%s\r\n", rcpt_addr, sx->igquotstr, sx->buffer);
2513
2514 if (count < 0) return -5;
2515 if (count > 0)
2516 {
2517 switch(sync_responses(sx, count, 0))
2518 {
2519 case 3: sx->ok = TRUE; /* 2xx & 5xx => OK & progress made */
2520 case 2: sx->completed_addr = TRUE; /* 5xx (only) => progress made */
2521 break;
2522
2523 case 1: sx->ok = TRUE; /* 2xx (only) => OK, but if LMTP, */
2524 if (!sx->lmtp) /* can't tell about progress yet */
2525 sx->completed_addr = TRUE;
2526 case 0: /* No 2xx or 5xx, but no probs */
2527 break;
2528
2529 case -1: return -3; /* Timeout on RCPT */
2530 case -2: return -2; /* non-MAIL read i/o error */
2531 default: return -1; /* any MAIL error */
2532 }
2533 sx->pending_MAIL = FALSE; /* Dealt with MAIL */
2534 }
2535 } /* Loop for next address */
2536
2537 sx->next_addr = addr;
2538 return 0;
2539 }
2540
2541
2542 #ifdef SUPPORT_TLS
2543 /*****************************************************
2544 * Proxy TLS connection for another transport process *
2545 ******************************************************/
2546 /*
2547 Use the given buffer as a staging area, and select on both the given fd
2548 and the TLS'd client-fd for data to read (per the coding in ip_recv() and
2549 fd_ready() this is legitimate). Do blocking full-size writes, and reads
2550 under a timeout.
2551
2552 Arguments:
2553 buf space to use for buffering
2554 bufsiz size of buffer
2555 proxy_fd comms to proxied process
2556 timeout per-read timeout, seconds
2557 */
2558
2559 void
2560 smtp_proxy_tls(uschar * buf, size_t bsize, int proxy_fd, int timeout)
2561 {
2562 fd_set fds;
2563 int max_fd = MAX(proxy_fd, tls_out.active) + 1;
2564 int rc, i, fd_bits, nbytes;
2565
2566 set_process_info("proxying TLS connection for continued transport");
2567 FD_ZERO(&fds);
2568 FD_SET(tls_out.active, &fds);
2569 FD_SET(proxy_fd, &fds);
2570
2571 for (fd_bits = 3; fd_bits; )
2572 {
2573 time_t time_left = timeout;
2574 time_t time_start = time(NULL);
2575
2576 /* wait for data */
2577 do
2578 {
2579 struct timeval tv = { time_left, 0 };
2580
2581 rc = select(max_fd, (SELECT_ARG2_TYPE *)&fds, NULL, NULL, &tv);
2582
2583 if (rc < 0 && errno == EINTR)
2584 if ((time_left -= time(NULL) - time_start) > 0) continue;
2585
2586 if (rc <= 0)
2587 {
2588 DEBUG(D_transport) if (rc == 0) debug_printf("%s: timed out\n", __FUNCTION__);
2589 return;
2590 }
2591 }
2592 while (rc < 0 || !(FD_ISSET(tls_out.active, &fds) || FD_ISSET(proxy_fd, &fds)));
2593
2594 /* handle inbound data */
2595 if (FD_ISSET(tls_out.active, &fds))
2596 if ((rc = tls_read(FALSE, buf, bsize)) <= 0)
2597 {
2598 fd_bits &= ~1;
2599 FD_CLR(tls_out.active, &fds);
2600 shutdown(proxy_fd, SHUT_WR);
2601 }
2602 else
2603 {
2604 for (nbytes = 0; rc - nbytes > 0; nbytes += i)
2605 if ((i = write(proxy_fd, buf + nbytes, rc - nbytes)) < 0) return;
2606 }
2607 else if (fd_bits & 1)
2608 FD_SET(tls_out.active, &fds);
2609
2610 /* handle outbound data */
2611 if (FD_ISSET(proxy_fd, &fds))
2612 if ((rc = read(proxy_fd, buf, bsize)) <= 0)
2613 {
2614 fd_bits &= ~2;
2615 FD_CLR(proxy_fd, &fds);
2616 shutdown(tls_out.active, SHUT_WR);
2617 }
2618 else
2619 {
2620 for (nbytes = 0; rc - nbytes > 0; nbytes += i)
2621 if ((i = tls_write(FALSE, buf + nbytes, rc - nbytes)) < 0) return;
2622 }
2623 else if (fd_bits & 2)
2624 FD_SET(proxy_fd, &fds);
2625 }
2626 }
2627 #endif
2628
2629
2630 /*************************************************
2631 * Deliver address list to given host *
2632 *************************************************/
2633
2634 /* If continue_hostname is not null, we get here only when continuing to
2635 deliver down an existing channel. The channel was passed as the standard
2636 input. TLS is never active on a passed channel; the previous process always
2637 closes it down before passing the connection on.
2638
2639 Otherwise, we have to make a connection to the remote host, and do the
2640 initial protocol exchange.
2641
2642 When running as an MUA wrapper, if the sender or any recipient is rejected,
2643 temporarily or permanently, we force failure for all recipients.
2644
2645 Arguments:
2646 addrlist chain of potential addresses to deliver; only those whose
2647 transport_return field is set to PENDING_DEFER are currently
2648 being processed; others should be skipped - they have either
2649 been delivered to an earlier host or IP address, or been
2650 failed by one of them.
2651 host host to deliver to
2652 host_af AF_INET or AF_INET6
2653 port default TCP/IP port to use, in host byte order
2654 interface interface to bind to, or NULL
2655 tblock transport instance block
2656 message_defer set TRUE if yield is OK, but all addresses were deferred
2657 because of a non-recipient, non-host failure, that is, a
2658 4xx response to MAIL FROM, DATA, or ".". This is a defer
2659 that is specific to the message.
2660 suppress_tls if TRUE, don't attempt a TLS connection - this is set for
2661 a second attempt after TLS initialization fails
2662
2663 Returns: OK - the connection was made and the delivery attempted;
2664 the result for each address is in its data block.
2665 DEFER - the connection could not be made, or something failed
2666 while setting up the SMTP session, or there was a
2667 non-message-specific error, such as a timeout.
2668 ERROR - a filter command is specified for this transport,
2669 and there was a problem setting it up; OR helo_data
2670 or add_headers or authenticated_sender is specified
2671 for this transport, and the string failed to expand
2672 */
2673
2674 static int
2675 smtp_deliver(address_item *addrlist, host_item *host, int host_af, int port,
2676 uschar *interface, transport_instance *tblock,
2677 BOOL *message_defer, BOOL suppress_tls)
2678 {
2679 address_item *addr;
2680 int yield = OK;
2681 int save_errno;
2682 int rc;
2683 time_t start_delivery_time = time(NULL);
2684
2685 BOOL pass_message = FALSE;
2686 uschar *message = NULL;
2687 uschar new_message_id[MESSAGE_ID_LENGTH + 1];
2688 uschar *p;
2689
2690 smtp_context sx;
2691
2692 suppress_tls = suppress_tls; /* stop compiler warning when no TLS support */
2693 *message_defer = FALSE;
2694
2695 sx.addrlist = addrlist;
2696 sx.host = host;
2697 sx.host_af = host_af,
2698 sx.port = port;
2699 sx.interface = interface;
2700 sx.helo_data = NULL;
2701 sx.tblock = tblock;
2702 sx.verify = FALSE;
2703
2704 /* Get the channel set up ready for a message (MAIL FROM being the next
2705 SMTP command to send */
2706
2707 if ((rc = smtp_setup_conn(&sx, suppress_tls)) != OK)
2708 return rc;
2709
2710 /* If there is a filter command specified for this transport, we can now
2711 set it up. This cannot be done until the identify of the host is known. */
2712
2713 if (tblock->filter_command)
2714 {
2715 transport_filter_timeout = tblock->filter_timeout;
2716
2717 /* On failure, copy the error to all addresses, abandon the SMTP call, and
2718 yield ERROR. */
2719
2720 if (!transport_set_up_command(&transport_filter_argv,
2721 tblock->filter_command, TRUE, DEFER, addrlist,
2722 string_sprintf("%.50s transport", tblock->name), NULL))
2723 {
2724 set_errno_nohost(addrlist->next, addrlist->basic_errno, addrlist->message, DEFER,
2725 FALSE);
2726 yield = ERROR;
2727 goto SEND_QUIT;
2728 }
2729
2730 if ( transport_filter_argv
2731 && *transport_filter_argv
2732 && **transport_filter_argv
2733 && sx.peer_offered & PEER_OFFERED_CHUNKING
2734 )
2735 {
2736 sx.peer_offered &= ~PEER_OFFERED_CHUNKING;
2737 DEBUG(D_transport) debug_printf("CHUNKING not usable due to transport filter\n");
2738 }
2739 }
2740
2741 sx.first_addr = addrlist;
2742
2743 /* For messages that have more than the maximum number of envelope recipients,
2744 we want to send several transactions down the same SMTP connection. (See
2745 comments in deliver.c as to how this reconciles, heuristically, with
2746 remote_max_parallel.) This optimization was added to Exim after the following
2747 code was already working. The simplest way to put it in without disturbing the
2748 code was to use a goto to jump back to this point when there is another
2749 transaction to handle. */
2750
2751 SEND_MESSAGE:
2752 sx.from_addr = return_path;
2753 sx.sync_addr = sx.first_addr;
2754 sx.ok = FALSE;
2755 sx.send_rset = TRUE;
2756 sx.completed_addr = FALSE;
2757
2758
2759 /* If we are a continued-connection-after-verify the MAIL and RCPT
2760 commands were already sent; do not re-send but do mark the addrs as
2761 having been accepted up to RCPT stage. A traditional cont-conn
2762 always has a sequence number greater than one. */
2763
2764 if (continue_hostname && continue_sequence == 1)
2765 {
2766 address_item * addr;
2767
2768 sx.peer_offered = smtp_peer_options;
2769 sx.pending_MAIL = FALSE;
2770 sx.ok = TRUE;
2771 sx.next_addr = NULL;
2772
2773 for (addr = addrlist; addr; addr = addr->next)
2774 addr->transport_return = PENDING_OK;
2775 }
2776 else
2777 {
2778 /* Initiate a message transfer. */
2779
2780 switch(smtp_write_mail_and_rcpt_cmds(&sx, &yield))
2781 {
2782 case 0: break;
2783 case -1: case -2: goto RESPONSE_FAILED;
2784 case -3: goto END_OFF;
2785 case -4: goto SEND_QUIT;
2786 default: goto SEND_FAILED;
2787 }
2788
2789 /* If we are an MUA wrapper, abort if any RCPTs were rejected, either
2790 permanently or temporarily. We should have flushed and synced after the last
2791 RCPT. */
2792
2793 if (mua_wrapper)
2794 {
2795 address_item * a;
2796 unsigned cnt;
2797
2798 for (a = sx.first_addr, cnt = 0; a && cnt < sx.max_rcpt; a = a->next, cnt++)
2799 if (a->transport_return != PENDING_OK)
2800 {
2801 /*XXX could we find a better errno than 0 here? */
2802 set_errno_nohost(addrlist, 0, a->message, FAIL,
2803 testflag(a, af_pass_message));
2804 sx.ok = FALSE;
2805 break;
2806 }
2807 }
2808 }
2809
2810 /* If ok is TRUE, we know we have got at least one good recipient, and must now
2811 send DATA, but if it is FALSE (in the normal, non-wrapper case), we may still
2812 have a good recipient buffered up if we are pipelining. We don't want to waste
2813 time sending DATA needlessly, so we only send it if either ok is TRUE or if we
2814 are pipelining. The responses are all handled by sync_responses().
2815 If using CHUNKING, do not send a BDAT until we know how big a chunk we want
2816 to send is. */
2817
2818 if ( !(sx.peer_offered & PEER_OFFERED_CHUNKING)
2819 && (sx.ok || (pipelining_active && !mua_wrapper)))
2820 {
2821 int count = smtp_write_command(&sx.outblock, SCMD_FLUSH, "DATA\r\n");
2822
2823 if (count < 0) goto SEND_FAILED;
2824 switch(sync_responses(&sx, count, sx.ok ? +1 : -1))
2825 {
2826 case 3: sx.ok = TRUE; /* 2xx & 5xx => OK & progress made */
2827 case 2: sx.completed_addr = TRUE; /* 5xx (only) => progress made */
2828 break;
2829
2830 case 1: sx.ok = TRUE; /* 2xx (only) => OK, but if LMTP, */
2831 if (!sx.lmtp) sx.completed_addr = TRUE; /* can't tell about progress yet */
2832 case 0: break; /* No 2xx or 5xx, but no probs */
2833
2834 case -1: goto END_OFF; /* Timeout on RCPT */
2835 default: goto RESPONSE_FAILED; /* I/O error, or any MAIL/DATA error */
2836 }
2837 pipelining_active = FALSE;
2838 data_command = string_copy(big_buffer); /* Save for later error message */
2839 }
2840
2841 /* If there were no good recipients (but otherwise there have been no
2842 problems), just set ok TRUE, since we have handled address-specific errors
2843 already. Otherwise, it's OK to send the message. Use the check/escape mechanism
2844 for handling the SMTP dot-handling protocol, flagging to apply to headers as
2845 well as body. Set the appropriate timeout value to be used for each chunk.
2846 (Haven't been able to make it work using select() for writing yet.) */
2847
2848 if (!(sx.peer_offered & PEER_OFFERED_CHUNKING) && !sx.ok)
2849 {
2850 /* Save the first address of the next batch. */
2851 sx.first_addr = sx.next_addr;
2852
2853 sx.ok = TRUE;
2854 }
2855 else
2856 {
2857 transport_ctx tctx = {
2858 sx.inblock.sock,
2859 tblock,
2860 addrlist,
2861 US".", US"..", /* Escaping strings */
2862 topt_use_crlf | topt_escape_headers
2863 | (tblock->body_only ? topt_no_headers : 0)
2864 | (tblock->headers_only ? topt_no_body : 0)
2865 | (tblock->return_path_add ? topt_add_return_path : 0)
2866 | (tblock->delivery_date_add ? topt_add_delivery_date : 0)
2867 | (tblock->envelope_to_add ? topt_add_envelope_to : 0)
2868 };
2869
2870 /* If using CHUNKING we need a callback from the generic transport
2871 support to us, for the sending of BDAT smtp commands and the reaping
2872 of responses. The callback needs a whole bunch of state so set up
2873 a transport-context structure to be passed around. */
2874
2875 if (sx.peer_offered & PEER_OFFERED_CHUNKING)
2876 {
2877 tctx.check_string = tctx.escape_string = NULL;
2878 tctx.options |= topt_use_bdat;
2879 tctx.chunk_cb = smtp_chunk_cmd_callback;
2880 sx.pending_BDAT = FALSE;
2881 sx.good_RCPT = sx.ok;
2882 sx.cmd_count = 0;
2883 tctx.smtp_context = &sx;
2884 }
2885 else
2886 tctx.options |= topt_end_dot;
2887
2888 /* Save the first address of the next batch. */
2889 sx.first_addr = sx.next_addr;
2890
2891 /* Responses from CHUNKING commands go in buffer. Otherwise,
2892 there has not been a response. */
2893
2894 sx.buffer[0] = 0;
2895
2896 sigalrm_seen = FALSE;
2897 transport_write_timeout = sx.ob->data_timeout;
2898 smtp_command = US"sending data block"; /* For error messages */
2899 DEBUG(D_transport|D_v)
2900 if (sx.peer_offered & PEER_OFFERED_CHUNKING)
2901 debug_printf(" will write message using CHUNKING\n");
2902 else
2903 debug_printf(" SMTP>> writing message and terminating \".\"\n");
2904 transport_count = 0;
2905
2906 #ifndef DISABLE_DKIM
2907 sx.ok = dkim_transport_write_message(&tctx, &sx.ob->dkim, CUSS &message);
2908 #else
2909 sx.ok = transport_write_message(&tctx, 0);
2910 #endif
2911
2912 /* transport_write_message() uses write() because it is called from other
2913 places to write to non-sockets. This means that under some OS (e.g. Solaris)
2914 it can exit with "Broken pipe" as its error. This really means that the
2915 socket got closed at the far end. */
2916
2917 transport_write_timeout = 0; /* for subsequent transports */
2918
2919 /* Failure can either be some kind of I/O disaster (including timeout),
2920 or the failure of a transport filter or the expansion of added headers.
2921 Or, when CHUNKING, it can be a protocol-detected failure. */
2922
2923 if (!sx.ok)
2924 if (message) goto SEND_FAILED;
2925 else goto RESPONSE_FAILED;
2926
2927 /* We used to send the terminating "." explicitly here, but because of
2928 buffering effects at both ends of TCP/IP connections, you don't gain
2929 anything by keeping it separate, so it might as well go in the final
2930 data buffer for efficiency. This is now done by setting the topt_end_dot
2931 flag above. */
2932
2933 smtp_command = US"end of data";
2934
2935 if (sx.peer_offered & PEER_OFFERED_CHUNKING && sx.cmd_count > 1)
2936 {
2937 /* Reap any outstanding MAIL & RCPT commands, but not a DATA-go-ahead */
2938 switch(sync_responses(&sx, sx.cmd_count-1, 0))
2939 {
2940 case 3: sx.ok = TRUE; /* 2xx & 5xx => OK & progress made */
2941 case 2: sx.completed_addr = TRUE; /* 5xx (only) => progress made */
2942 break;
2943
2944 case 1: sx.ok = TRUE; /* 2xx (only) => OK, but if LMTP, */
2945 if (!sx.lmtp) sx.completed_addr = TRUE; /* can't tell about progress yet */
2946 case 0: break; /* No 2xx or 5xx, but no probs */
2947
2948 case -1: goto END_OFF; /* Timeout on RCPT */
2949 default: goto RESPONSE_FAILED; /* I/O error, or any MAIL/DATA error */
2950 }
2951 }
2952
2953 #ifndef DISABLE_PRDR
2954 /* For PRDR we optionally get a partial-responses warning
2955 * followed by the individual responses, before going on with
2956 * the overall response. If we don't get the warning then deal
2957 * with per non-PRDR. */
2958 if(sx.prdr_active)
2959 {
2960 sx.ok = smtp_read_response(&sx.inblock, sx.buffer, sizeof(sx.buffer), '3',
2961 sx.ob->final_timeout);
2962 if (!sx.ok && errno == 0) switch(sx.buffer[0])
2963 {
2964 case '2': sx.prdr_active = FALSE;
2965 sx.ok = TRUE;
2966 break;
2967 case '4': errno = ERRNO_DATA4XX;
2968 addrlist->more_errno |=
2969 ((sx.buffer[1] - '0')*10 + sx.buffer[2] - '0') << 8;
2970 break;
2971 }
2972 }
2973 else
2974 #endif
2975
2976 /* For non-PRDR SMTP, we now read a single response that applies to the
2977 whole message. If it is OK, then all the addresses have been delivered. */
2978
2979 if (!sx.lmtp)
2980 {
2981 sx.ok = smtp_read_response(&sx.inblock, sx.buffer, sizeof(sx.buffer), '2',
2982 sx.ob->final_timeout);
2983 if (!sx.ok && errno == 0 && sx.buffer[0] == '4')
2984 {
2985 errno = ERRNO_DATA4XX;
2986 addrlist->more_errno |= ((sx.buffer[1] - '0')*10 + sx.buffer[2] - '0') << 8;
2987 }
2988 }
2989
2990 /* For LMTP, we get back a response for every RCPT command that we sent;
2991 some may be accepted and some rejected. For those that get a response, their
2992 status is fixed; any that are accepted have been handed over, even if later
2993 responses crash - at least, that's how I read RFC 2033.
2994
2995 If all went well, mark the recipient addresses as completed, record which
2996 host/IPaddress they were delivered to, and cut out RSET when sending another
2997 message down the same channel. Write the completed addresses to the journal
2998 now so that they are recorded in case there is a crash of hardware or
2999 software before the spool gets updated. Also record the final SMTP
3000 confirmation if needed (for SMTP only). */
3001
3002 if (sx.ok)
3003 {
3004 int flag = '=';
3005 int delivery_time = (int)(time(NULL) - start_delivery_time);
3006 int len;
3007 uschar *conf = NULL;
3008
3009 sx.send_rset = FALSE;
3010 pipelining_active = FALSE;
3011
3012 /* Set up confirmation if needed - applies only to SMTP */
3013
3014 if (
3015 #ifdef DISABLE_EVENT
3016 LOGGING(smtp_confirmation) &&
3017 #endif
3018 !sx.lmtp
3019 )
3020 {
3021 const uschar *s = string_printing(sx.buffer);
3022 /* deconst cast ok here as string_printing was checked to have alloc'n'copied */
3023 conf = (s == sx.buffer)? (uschar *)string_copy(s) : US s;
3024 }
3025
3026 /* Process all transported addresses - for LMTP or PRDR, read a status for
3027 each one. */
3028
3029 for (addr = addrlist; addr != sx.first_addr; addr = addr->next)
3030 {
3031 if (addr->transport_return != PENDING_OK) continue;
3032
3033 /* LMTP - if the response fails badly (e.g. timeout), use it for all the
3034 remaining addresses. Otherwise, it's a return code for just the one
3035 address. For temporary errors, add a retry item for the address so that
3036 it doesn't get tried again too soon. */
3037
3038 #ifndef DISABLE_PRDR
3039 if (sx.lmtp || sx.prdr_active)
3040 #else
3041 if (sx.lmtp)
3042 #endif
3043 {
3044 if (!smtp_read_response(&sx.inblock, sx.buffer, sizeof(sx.buffer), '2',
3045 sx.ob->final_timeout))
3046 {
3047 if (errno != 0 || sx.buffer[0] == 0) goto RESPONSE_FAILED;
3048 addr->message = string_sprintf(
3049 #ifndef DISABLE_PRDR
3050 "%s error after %s: %s", sx.prdr_active ? "PRDR":"LMTP",
3051 #else
3052 "LMTP error after %s: %s",
3053 #endif
3054 data_command, string_printing(sx.buffer));
3055 setflag(addr, af_pass_message); /* Allow message to go to user */
3056 if (sx.buffer[0] == '5')
3057 addr->transport_return = FAIL;
3058 else
3059 {
3060 errno = ERRNO_DATA4XX;
3061 addr->more_errno |= ((sx.buffer[1] - '0')*10 + sx.buffer[2] - '0') << 8;
3062 addr->transport_return = DEFER;
3063 #ifndef DISABLE_PRDR
3064 if (!sx.prdr_active)
3065 #endif
3066 retry_add_item(addr, addr->address_retry_key, 0);
3067 }
3068 continue;
3069 }
3070 sx.completed_addr = TRUE; /* NOW we can set this flag */
3071 if (LOGGING(smtp_confirmation))
3072 {
3073 const uschar *s = string_printing(sx.buffer);
3074 /* deconst cast ok here as string_printing was checked to have alloc'n'copied */
3075 conf = (s == sx.buffer) ? US string_copy(s) : US s;
3076 }
3077 }
3078
3079 /* SMTP, or success return from LMTP for this address. Pass back the
3080 actual host that was used. */
3081
3082 addr->transport_return = OK;
3083 addr->more_errno = delivery_time;
3084 addr->host_used = host;
3085 addr->special_action = flag;
3086 addr->message = conf;
3087 #ifndef DISABLE_PRDR
3088 if (sx.prdr_active) addr->flags |= af_prdr_used;
3089 #endif
3090 if (sx.peer_offered & PEER_OFFERED_CHUNKING) addr->flags |= af_chunking_used;
3091 flag = '-';
3092
3093 #ifndef DISABLE_PRDR
3094 if (!sx.prdr_active)
3095 #endif
3096 {
3097 /* Update the journal. For homonymic addresses, use the base address plus
3098 the transport name. See lots of comments in deliver.c about the reasons
3099 for the complications when homonyms are involved. Just carry on after
3100 write error, as it may prove possible to update the spool file later. */
3101
3102 if (testflag(addr, af_homonym))
3103 sprintf(CS sx.buffer, "%.500s/%s\n", addr->unique + 3, tblock->name);
3104 else
3105 sprintf(CS sx.buffer, "%.500s\n", addr->unique);
3106
3107 DEBUG(D_deliver) debug_printf("S:journalling %s\n", sx.buffer);
3108 len = Ustrlen(CS sx.buffer);
3109 if (write(journal_fd, sx.buffer, len) != len)
3110 log_write(0, LOG_MAIN|LOG_PANIC, "failed to write journal for "
3111 "%s: %s", sx.buffer, strerror(errno));
3112 }
3113 }
3114
3115 #ifndef DISABLE_PRDR
3116 if (sx.prdr_active)
3117 {
3118 /* PRDR - get the final, overall response. For any non-success
3119 upgrade all the address statuses. */
3120 sx.ok = smtp_read_response(&sx.inblock, sx.buffer, sizeof(sx.buffer), '2',
3121 sx.ob->final_timeout);
3122 if (!sx.ok)
3123 {
3124 if(errno == 0 && sx.buffer[0] == '4')
3125 {
3126 errno = ERRNO_DATA4XX;
3127 addrlist->more_errno |= ((sx.buffer[1] - '0')*10 + sx.buffer[2] - '0') << 8;
3128 }
3129 for (addr = addrlist; addr != sx.first_addr; addr = addr->next)
3130 if (sx.buffer[0] == '5' || addr->transport_return == OK)
3131 addr->transport_return = PENDING_OK; /* allow set_errno action */
3132 goto RESPONSE_FAILED;
3133 }
3134
3135 /* Update the journal, or setup retry. */
3136 for (addr = addrlist; addr != sx.first_addr; addr = addr->next)
3137 if (addr->transport_return == OK)
3138 {
3139 if (testflag(addr, af_homonym))
3140 sprintf(CS sx.buffer, "%.500s/%s\n", addr->unique + 3, tblock->name);
3141 else
3142 sprintf(CS sx.buffer, "%.500s\n", addr->unique);
3143
3144 DEBUG(D_deliver) debug_printf("journalling(PRDR) %s\n", sx.buffer);
3145 len = Ustrlen(CS sx.buffer);
3146 if (write(journal_fd, sx.buffer, len) != len)
3147 log_write(0, LOG_MAIN|LOG_PANIC, "failed to write journal for "
3148 "%s: %s", sx.buffer, strerror(errno));
3149 }
3150 else if (addr->transport_return == DEFER)
3151 retry_add_item(addr, addr->address_retry_key, -2);
3152 }
3153 #endif
3154
3155 /* Ensure the journal file is pushed out to disk. */
3156
3157 if (EXIMfsync(journal_fd) < 0)
3158 log_write(0, LOG_MAIN|LOG_PANIC, "failed to fsync journal: %s",
3159 strerror(errno));
3160 }
3161 }
3162
3163
3164 /* Handle general (not specific to one address) failures here. The value of ok
3165 is used to skip over this code on the falling through case. A timeout causes a
3166 deferral. Other errors may defer or fail according to the response code, and
3167 may set up a special errno value, e.g. after connection chopped, which is
3168 assumed if errno == 0 and there is no text in the buffer. If control reaches
3169 here during the setting up phase (i.e. before MAIL FROM) then always defer, as
3170 the problem is not related to this specific message. */
3171
3172 if (!sx.ok)
3173 {
3174 int code, set_rc;
3175 uschar * set_message;
3176
3177 RESPONSE_FAILED:
3178 {
3179 save_errno = errno;
3180 message = NULL;
3181 sx.send_quit = check_response(host, &save_errno, addrlist->more_errno,
3182 sx.buffer, &code, &message, &pass_message);
3183 goto FAILED;
3184 }
3185
3186 SEND_FAILED:
3187 {
3188 save_errno = errno;
3189 code = '4';
3190 message = string_sprintf("send() to %s [%s] failed: %s",
3191 host->name, host->address, message ? message : US strerror(save_errno));
3192 sx.send_quit = FALSE;
3193 goto FAILED;
3194 }
3195
3196 FAILED:
3197 {
3198 BOOL message_error;
3199
3200 sx.ok = FALSE; /* For when reached by GOTO */
3201 set_message = message;
3202
3203 /* We want to handle timeouts after MAIL or "." and loss of connection after
3204 "." specially. They can indicate a problem with the sender address or with
3205 the contents of the message rather than a real error on the connection. These
3206 cases are treated in the same way as a 4xx response. This next bit of code
3207 does the classification. */
3208
3209 switch(save_errno)
3210 {
3211 case 0:
3212 case ERRNO_MAIL4XX:
3213 case ERRNO_DATA4XX:
3214 message_error = TRUE;
3215 break;
3216
3217 case ETIMEDOUT:
3218 message_error = Ustrncmp(smtp_command,"MAIL",4) == 0 ||
3219 Ustrncmp(smtp_command,"end ",4) == 0;
3220 break;
3221
3222 case ERRNO_SMTPCLOSED:
3223 message_error = Ustrncmp(smtp_command,"end ",4) == 0;
3224 break;
3225
3226 default:
3227 message_error = FALSE;
3228 break;
3229 }
3230
3231 /* Handle the cases that are treated as message errors. These are:
3232
3233 (a) negative response or timeout after MAIL
3234 (b) negative response after DATA
3235 (c) negative response or timeout or dropped connection after "."
3236 (d) utf8 support required and not offered
3237
3238 It won't be a negative response or timeout after RCPT, as that is dealt
3239 with separately above. The action in all cases is to set an appropriate
3240 error code for all the addresses, but to leave yield set to OK because the
3241 host itself has not failed. Of course, it might in practice have failed
3242 when we've had a timeout, but if so, we'll discover that at the next
3243 delivery attempt. For a temporary error, set the message_defer flag, and
3244 write to the logs for information if this is not the last host. The error
3245 for the last host will be logged as part of the address's log line. */
3246
3247 if (message_error)
3248 {
3249 if (mua_wrapper) code = '5'; /* Force hard failure in wrapper mode */
3250
3251 /* If there's an errno, the message contains just the identity of
3252 the host. */
3253
3254 if (code == '5')
3255 set_rc = FAIL;
3256 else /* Anything other than 5 is treated as temporary */
3257 {
3258 set_rc = DEFER;
3259 if (save_errno > 0)
3260 message = US string_sprintf("%s: %s", message, strerror(save_errno));
3261 if (host->next != NULL) log_write(0, LOG_MAIN, "%s", message);
3262 msglog_line(host, message);
3263 *message_defer = TRUE;
3264 }
3265 }
3266
3267 /* Otherwise, we have an I/O error or a timeout other than after MAIL or
3268 ".", or some other transportation error. We defer all addresses and yield
3269 DEFER, except for the case of failed add_headers expansion, or a transport
3270 filter failure, when the yield should be ERROR, to stop it trying other
3271 hosts. */
3272
3273 else
3274 {
3275 set_rc = DEFER;
3276 yield = (save_errno == ERRNO_CHHEADER_FAIL ||
3277 save_errno == ERRNO_FILTER_FAIL)? ERROR : DEFER;
3278 }
3279 }
3280
3281 set_errno(addrlist, save_errno, set_message, set_rc, pass_message, host
3282 #ifdef EXPERIMENTAL_DSN_INFO
3283 , sx.smtp_greeting, sx.helo_response
3284 #endif
3285 );
3286 }
3287
3288
3289 /* If all has gone well, send_quit will be set TRUE, implying we can end the
3290 SMTP session tidily. However, if there were too many addresses to send in one
3291 message (indicated by first_addr being non-NULL) we want to carry on with the
3292 rest of them. Also, it is desirable to send more than one message down the SMTP
3293 connection if there are several waiting, provided we haven't already sent so
3294 many as to hit the configured limit. The function transport_check_waiting looks
3295 for a waiting message and returns its id. Then transport_pass_socket tries to
3296 set up a continued delivery by passing the socket on to another process. The
3297 variable send_rset is FALSE if a message has just been successfully transfered.
3298
3299 If we are already sending down a continued channel, there may be further
3300 addresses not yet delivered that are aimed at the same host, but which have not
3301 been passed in this run of the transport. In this case, continue_more will be
3302 true, and all we should do is send RSET if necessary, and return, leaving the
3303 channel open.
3304
3305 However, if no address was disposed of, i.e. all addresses got 4xx errors, we
3306 do not want to continue with other messages down the same channel, because that
3307 can lead to looping between two or more messages, all with the same,
3308 temporarily failing address(es). [The retry information isn't updated yet, so
3309 new processes keep on trying.] We probably also don't want to try more of this
3310 message's addresses either.
3311
3312 If we have started a TLS session, we have to end it before passing the
3313 connection to a new process. However, not all servers can handle this (Exim
3314 can), so we do not pass such a connection on if the host matches
3315 hosts_nopass_tls. */
3316
3317 DEBUG(D_transport)
3318 debug_printf("ok=%d send_quit=%d send_rset=%d continue_more=%d "
3319 "yield=%d first_address is %sNULL\n", sx.ok, sx.send_quit,
3320 sx.send_rset, continue_more, yield, sx.first_addr ? "not " : "");
3321
3322 if (sx.completed_addr && sx.ok && sx.send_quit)
3323 {
3324 BOOL more;
3325 smtp_compare_t t_compare;
3326
3327 t_compare.tblock = tblock;
3328 t_compare.current_sender_address = sender_address;
3329
3330 if ( sx.first_addr != NULL
3331 || continue_more
3332 || (
3333 #ifdef SUPPORT_TLS
3334 ( tls_out.active < 0 && !continue_proxy_cipher
3335 || verify_check_given_host(&sx.ob->hosts_nopass_tls, host) != OK
3336 )
3337 &&
3338 #endif
3339 transport_check_waiting(tblock->name, host->name,
3340 tblock->connection_max_messages, new_message_id, &more,
3341 (oicf)smtp_are_same_identities, (void*)&t_compare)
3342 ) )
3343 {
3344 uschar *msg;
3345 BOOL pass_message;
3346
3347 if (sx.send_rset)
3348 if (! (sx.ok = smtp_write_command(&sx.outblock, SCMD_FLUSH, "RSET\r\n") >= 0))
3349 {
3350 msg = US string_sprintf("send() to %s [%s] failed: %s", host->name,
3351 host->address, strerror(errno));
3352 sx.send_quit = FALSE;
3353 }
3354 else if (! (sx.ok = smtp_read_response(&sx.inblock, sx.buffer,
3355 sizeof(sx.buffer), '2', sx.ob->command_timeout)))
3356 {
3357 int code;
3358 sx.send_quit = check_response(host, &errno, 0, sx.buffer, &code, &msg,
3359 &pass_message);
3360 if (!sx.send_quit)
3361 {
3362 DEBUG(D_transport) debug_printf("H=%s [%s] %s\n",
3363 host->name, host->address, msg);
3364 }
3365 }
3366
3367 /* Either RSET was not needed, or it succeeded */
3368
3369 if (sx.ok)
3370 {
3371 int pfd[2];
3372 int socket_fd = sx.inblock.sock;
3373
3374
3375 if (sx.first_addr != NULL) /* More addresses still to be sent */
3376 { /* in this run of the transport */
3377 continue_sequence++; /* Causes * in logging */
3378 goto SEND_MESSAGE;
3379 }
3380
3381 /* Unless caller said it already has more messages listed for this host,
3382 pass the connection on to a new Exim process (below, the call to
3383 transport_pass_socket). If the caller has more ready, just return with
3384 the connection still open. */
3385
3386 #ifdef SUPPORT_TLS
3387 if (tls_out.active >= 0)
3388 if ( continue_more
3389 || verify_check_given_host(&sx.ob->hosts_noproxy_tls, host) == OK)
3390 {
3391 /* Before passing the socket on, or returning to caller with it still
3392 open, we must shut down TLS. Not all MTAs allow for the continuation
3393 of the SMTP session when TLS is shut down. We test for this by sending
3394 a new EHLO. If we don't get a good response, we don't attempt to pass
3395 the socket on. */
3396
3397 tls_close(FALSE, TRUE);
3398 smtp_peer_options = smtp_peer_options_wrap;
3399 sx.ok = !sx.smtps
3400 && smtp_write_command(&sx.outblock, SCMD_FLUSH,
3401 "EHLO %s\r\n", sx.helo_data) >= 0
3402 && smtp_read_response(&sx.inblock, sx.buffer, sizeof(sx.buffer),
3403 '2', sx.ob->command_timeout);
3404
3405 if (sx.ok && continue_more)
3406 return yield; /* More addresses for another run */
3407 }
3408 else
3409 {
3410 /* Set up a pipe for proxying TLS for the new transport process */
3411
3412 smtp_peer_options |= PEER_OFFERED_TLS;
3413 if (sx.ok = (socketpair(AF_UNIX, SOCK_STREAM, 0, pfd) == 0))
3414 socket_fd = pfd[1];
3415 else
3416 set_errno(sx.first_addr, errno, US"internal allocation problem",
3417 DEFER, FALSE, host
3418 # ifdef EXPERIMENTAL_DSN_INFO
3419 , sx.smtp_greeting, sx.helo_response
3420 # endif
3421 );
3422 }
3423 else
3424 #endif
3425 if (continue_more)
3426 return yield; /* More addresses for another run */
3427
3428 /* If the socket is successfully passed, we mustn't send QUIT (or
3429 indeed anything!) from here. */
3430
3431 /*XXX DSN_INFO: assume likely to do new HELO; but for greet we'll want to
3432 propagate it from the initial
3433 */
3434 if (sx.ok && transport_pass_socket(tblock->name, host->name,
3435 host->address, new_message_id, socket_fd))
3436 {
3437 sx.send_quit = FALSE;
3438
3439 /* If TLS is still active, we need to proxy it for the transport we
3440 just passed the baton to. Fork a child to to do it, and return to
3441 get logging done asap. Which way to place the work makes assumptions
3442 about post-fork prioritisation which may not hold on all platforms. */
3443 #ifdef SUPPORT_TLS
3444 if (tls_out.active >= 0)
3445 {
3446 int pid = fork();
3447 if (pid > 0) /* parent */
3448 {
3449 DEBUG(D_transport) debug_printf("proxy-proc inter-pid %d\n", pid);
3450 waitpid(pid, NULL, 0);
3451 tls_close(FALSE, FALSE);
3452 (void)close(sx.inblock.sock);
3453 continue_transport = NULL;
3454 continue_hostname = NULL;
3455 return yield;
3456 }
3457 else if (pid == 0) /* child; fork again to disconnect totally */
3458 {
3459 if ((pid = fork()))
3460 {
3461 DEBUG(D_transport) debug_printf("proxy-prox final-pid %d\n", pid);
3462 _exit(pid ? EXIT_FAILURE : EXIT_SUCCESS);
3463 }
3464 smtp_proxy_tls(sx.buffer, sizeof(sx.buffer), pfd[0], sx.ob->command_timeout);
3465 exim_exit(0);
3466 }
3467 }
3468 #endif
3469 }
3470 }
3471
3472 /* If RSET failed and there are addresses left, they get deferred. */
3473 else
3474 set_errno(sx.first_addr, errno, msg, DEFER, FALSE, host
3475 #ifdef EXPERIMENTAL_DSN_INFO
3476 , sx.smtp_greeting, sx.helo_response
3477 #endif
3478 );
3479 }
3480 }
3481
3482 /* End off tidily with QUIT unless the connection has died or the socket has
3483 been passed to another process. There has been discussion on the net about what
3484 to do after sending QUIT. The wording of the RFC suggests that it is necessary
3485 to wait for a response, but on the other hand, there isn't anything one can do
3486 with an error response, other than log it. Exim used to do that. However,
3487 further discussion suggested that it is positively advantageous not to wait for
3488 the response, but to close the session immediately. This is supposed to move
3489 the TCP/IP TIME_WAIT state from the server to the client, thereby removing some
3490 load from the server. (Hosts that are both servers and clients may not see much
3491 difference, of course.) Further discussion indicated that this was safe to do
3492 on Unix systems which have decent implementations of TCP/IP that leave the
3493 connection around for a while (TIME_WAIT) after the application has gone away.
3494 This enables the response sent by the server to be properly ACKed rather than
3495 timed out, as can happen on broken TCP/IP implementations on other OS.
3496
3497 This change is being made on 31-Jul-98. After over a year of trouble-free
3498 operation, the old commented-out code was removed on 17-Sep-99. */
3499
3500 SEND_QUIT:
3501 if (sx.send_quit) (void)smtp_write_command(&sx.outblock, SCMD_FLUSH, "QUIT\r\n");
3502
3503 END_OFF:
3504
3505 #ifdef SUPPORT_TLS
3506 tls_close(FALSE, TRUE);
3507 #endif
3508
3509 /* Close the socket, and return the appropriate value, first setting
3510 works because the NULL setting is passed back to the calling process, and
3511 remote_max_parallel is forced to 1 when delivering over an existing connection,
3512
3513 If all went well and continue_more is set, we shouldn't actually get here if
3514 there are further addresses, as the return above will be taken. However,
3515 writing RSET might have failed, or there may be other addresses whose hosts are
3516 specified in the transports, and therefore not visible at top level, in which
3517 case continue_more won't get set. */
3518
3519 HDEBUG(D_transport|D_acl|D_v) debug_printf_indent(" SMTP(close)>>\n");
3520 if (sx.send_quit)
3521 {
3522 shutdown(sx.outblock.sock, SHUT_WR);
3523 if (fcntl(sx.inblock.sock, F_SETFL, O_NONBLOCK) == 0)
3524 for (rc = 16; read(sx.inblock.sock, sx.inbuffer, sizeof(sx.inbuffer)) > 0 && rc > 0;)
3525 rc--; /* drain socket */
3526 }
3527 (void)close(sx.inblock.sock);
3528
3529 #ifndef DISABLE_EVENT
3530 (void) event_raise(tblock->event_action, US"tcp:close", NULL);
3531 #endif
3532
3533 continue_transport = NULL;
3534 continue_hostname = NULL;
3535 return yield;
3536 }
3537
3538
3539
3540
3541 /*************************************************
3542 * Closedown entry point *
3543 *************************************************/
3544
3545 /* This function is called when exim is passed an open smtp channel
3546 from another incarnation, but the message which it has been asked
3547 to deliver no longer exists. The channel is on stdin.
3548
3549 We might do fancy things like looking for another message to send down
3550 the channel, but if the one we sought has gone, it has probably been
3551 delivered by some other process that itself will seek further messages,
3552 so just close down our connection.
3553
3554 Argument: pointer to the transport instance block
3555 Returns: nothing
3556 */
3557
3558 void
3559 smtp_transport_closedown(transport_instance *tblock)
3560 {
3561 smtp_transport_options_block *ob =
3562 (smtp_transport_options_block *)tblock->options_block;
3563 smtp_inblock inblock;
3564 smtp_outblock outblock;
3565 uschar buffer[256];
3566 uschar inbuffer[4096];
3567 uschar outbuffer[16];
3568
3569 inblock.sock = fileno(stdin);
3570 inblock.buffer = inbuffer;
3571 inblock.buffersize = sizeof(inbuffer);
3572 inblock.ptr = inbuffer;
3573 inblock.ptrend = inbuffer;
3574
3575 outblock.sock = inblock.sock;
3576 outblock.buffersize = sizeof(outbuffer);
3577 outblock.buffer = outbuffer;
3578 outblock.ptr = outbuffer;
3579 outblock.cmd_count = 0;
3580 outblock.authenticating = FALSE;
3581
3582 (void)smtp_write_command(&outblock, SCMD_FLUSH, "QUIT\r\n");
3583 (void)smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
3584 ob->command_timeout);
3585 (void)close(inblock.sock);
3586 }
3587
3588
3589
3590 /*************************************************
3591 * Prepare addresses for delivery *
3592 *************************************************/
3593
3594 /* This function is called to flush out error settings from previous delivery
3595 attempts to other hosts. It also records whether we got here via an MX record
3596 or not in the more_errno field of the address. We are interested only in
3597 addresses that are still marked DEFER - others may have got delivered to a
3598 previously considered IP address. Set their status to PENDING_DEFER to indicate
3599 which ones are relevant this time.
3600
3601 Arguments:
3602 addrlist the list of addresses
3603 host the host we are delivering to
3604
3605 Returns: the first address for this delivery
3606 */
3607
3608 static address_item *
3609 prepare_addresses(address_item *addrlist, host_item *host)
3610 {
3611 address_item *first_addr = NULL;
3612 address_item *addr;
3613 for (addr = addrlist; addr; addr = addr->next)
3614 if (addr->transport_return == DEFER)
3615 {
3616 if (!first_addr) first_addr = addr;
3617 addr->transport_return = PENDING_DEFER;
3618 addr->basic_errno = 0;
3619 addr->more_errno = (host->mx >= 0)? 'M' : 'A';
3620 addr->message = NULL;
3621 #ifdef SUPPORT_TLS
3622 addr->cipher = NULL;
3623 addr->ourcert = NULL;
3624 addr->peercert = NULL;
3625 addr->peerdn = NULL;
3626 addr->ocsp = OCSP_NOT_REQ;
3627 #endif
3628 #ifdef EXPERIMENTAL_DSN_INFO
3629 addr->smtp_greeting = NULL;
3630 addr->helo_response = NULL;
3631 #endif
3632 }
3633 return first_addr;
3634 }
3635
3636
3637
3638 /*************************************************
3639 * Main entry point *
3640 *************************************************/
3641
3642 /* See local README for interface details. As this is a remote transport, it is
3643 given a chain of addresses to be delivered in one connection, if possible. It
3644 always returns TRUE, indicating that each address has its own independent
3645 status set, except if there is a setting up problem, in which case it returns
3646 FALSE. */
3647
3648 BOOL
3649 smtp_transport_entry(
3650 transport_instance *tblock, /* data for this instantiation */
3651 address_item *addrlist) /* addresses we are working on */
3652 {
3653 int cutoff_retry;
3654 int port;
3655 int hosts_defer = 0;
3656 int hosts_fail = 0;
3657 int hosts_looked_up = 0;
3658 int hosts_retry = 0;
3659 int hosts_serial = 0;
3660 int hosts_total = 0;
3661 int total_hosts_tried = 0;
3662 address_item *addr;
3663 BOOL expired = TRUE;
3664 uschar *expanded_hosts = NULL;
3665 uschar *pistring;
3666 uschar *tid = string_sprintf("%s transport", tblock->name);
3667 smtp_transport_options_block *ob =
3668 (smtp_transport_options_block *)(tblock->options_block);
3669 host_item *hostlist = addrlist->host_list;
3670 host_item *host = NULL;
3671
3672 DEBUG(D_transport)
3673 {
3674 debug_printf("%s transport entered\n", tblock->name);
3675 for (addr = addrlist; addr; addr = addr->next)
3676 debug_printf(" %s\n", addr->address);
3677 if (hostlist)
3678 {
3679 debug_printf("hostlist:\n");
3680 for (host = hostlist; host; host = host->next)
3681 debug_printf(" %s:%d\n", host->name, host->port);
3682 }
3683 if (continue_hostname)
3684 debug_printf("already connected to %s [%s] (on fd %d)\n",
3685 continue_hostname, continue_host_address,
3686 cutthrough.fd >= 0 ? cutthrough.fd : 0);
3687 }
3688
3689 /* Set the flag requesting that these hosts be added to the waiting
3690 database if the delivery fails temporarily or if we are running with
3691 queue_smtp or a 2-stage queue run. This gets unset for certain
3692 kinds of error, typically those that are specific to the message. */
3693
3694 update_waiting = TRUE;
3695
3696 /* If a host list is not defined for the addresses - they must all have the
3697 same one in order to be passed to a single transport - or if the transport has
3698 a host list with hosts_override set, use the host list supplied with the
3699 transport. It is an error for this not to exist. */
3700
3701 if (!hostlist || (ob->hosts_override && ob->hosts))
3702 {
3703 if (!ob->hosts)
3704 {
3705 addrlist->message = string_sprintf("%s transport called with no hosts set",
3706 tblock->name);
3707 addrlist->transport_return = PANIC;
3708 return FALSE; /* Only top address has status */
3709 }
3710
3711 DEBUG(D_transport) debug_printf("using the transport's hosts: %s\n",
3712 ob->hosts);
3713
3714 /* If the transport's host list contains no '$' characters, and we are not
3715 randomizing, it is fixed and therefore a chain of hosts can be built once
3716 and for all, and remembered for subsequent use by other calls to this
3717 transport. If, on the other hand, the host list does contain '$', or we are
3718 randomizing its order, we have to rebuild it each time. In the fixed case,
3719 as the hosts string will never be used again, it doesn't matter that we
3720 replace all the : characters with zeros. */
3721
3722 if (!ob->hostlist)
3723 {
3724 uschar *s = ob->hosts;
3725
3726 if (Ustrchr(s, '$') != NULL)
3727 {
3728 if (!(expanded_hosts = expand_string(s)))
3729 {
3730 addrlist->message = string_sprintf("failed to expand list of hosts "
3731 "\"%s\" in %s transport: %s", s, tblock->name, expand_string_message);
3732 addrlist->transport_return = search_find_defer ? DEFER : PANIC;
3733 return FALSE; /* Only top address has status */
3734 }
3735 DEBUG(D_transport) debug_printf("expanded list of hosts \"%s\" to "
3736 "\"%s\"\n", s, expanded_hosts);
3737 s = expanded_hosts;
3738 }
3739 else
3740 if (ob->hosts_randomize) s = expanded_hosts = string_copy(s);
3741
3742 host_build_hostlist(&hostlist, s, ob->hosts_randomize);
3743
3744 /* Check that the expansion yielded something useful. */
3745 if (!hostlist)
3746 {
3747 addrlist->message =
3748 string_sprintf("%s transport has empty hosts setting", tblock->name);
3749 addrlist->transport_return = PANIC;
3750 return FALSE; /* Only top address has status */
3751 }
3752
3753 /* If there was no expansion of hosts, save the host list for
3754 next time. */
3755
3756 if (!expanded_hosts) ob->hostlist = hostlist;
3757 }
3758
3759 /* This is not the first time this transport has been run in this delivery;
3760 the host list was built previously. */
3761
3762 else
3763 hostlist = ob->hostlist;
3764 }
3765
3766 /* The host list was supplied with the address. If hosts_randomize is set, we
3767 must sort it into a random order if it did not come from MX records and has not
3768 already been randomized (but don't bother if continuing down an existing
3769 connection). */
3770
3771 else if (ob->hosts_randomize && hostlist->mx == MX_NONE && !continue_hostname)
3772 {
3773 host_item *newlist = NULL;
3774 while (hostlist)
3775 {
3776 host_item *h = hostlist;
3777 hostlist = hostlist->next;
3778
3779 h->sort_key = random_number(100);
3780
3781 if (!newlist)
3782 {
3783 h->next = NULL;
3784 newlist = h;
3785 }
3786 else if (h->sort_key < newlist->sort_key)
3787 {
3788 h->next = newlist;
3789 newlist = h;
3790 }
3791 else
3792 {
3793 host_item *hh = newlist;
3794 while (hh->next)
3795 {
3796 if (h->sort_key < hh->next->sort_key) break;
3797 hh = hh->next;
3798 }
3799 h->next = hh->next;
3800 hh->next = h;
3801 }
3802 }
3803
3804 hostlist = addrlist->host_list = newlist;
3805 }
3806
3807 /* Sort out the default port. */
3808
3809 if (!smtp_get_port(ob->port, addrlist, &port, tid)) return FALSE;
3810
3811 /* For each host-plus-IP-address on the list:
3812
3813 . If this is a continued delivery and the host isn't the one with the
3814 current connection, skip.
3815
3816 . If the status is unusable (i.e. previously failed or retry checked), skip.
3817
3818 . If no IP address set, get the address, either by turning the name into
3819 an address, calling gethostbyname if gethostbyname is on, or by calling
3820 the DNS. The DNS may yield multiple addresses, in which case insert the
3821 extra ones into the list.
3822
3823 . Get the retry data if not previously obtained for this address and set the
3824 field which remembers the state of this address. Skip if the retry time is
3825 not reached. If not, remember whether retry data was found. The retry string
3826 contains both the name and the IP address.
3827
3828 . Scan the list of addresses and mark those whose status is DEFER as
3829 PENDING_DEFER. These are the only ones that will be processed in this cycle
3830 of the hosts loop.
3831
3832 . Make a delivery attempt - addresses marked PENDING_DEFER will be tried.
3833 Some addresses may be successfully delivered, others may fail, and yet
3834 others may get temporary errors and so get marked DEFER.
3835
3836 . The return from the delivery attempt is OK if a connection was made and a
3837 valid SMTP dialogue was completed. Otherwise it is DEFER.
3838
3839 . If OK, add a "remove" retry item for this host/IPaddress, if any.
3840
3841 . If fail to connect, or other defer state, add a retry item.
3842
3843 . If there are any addresses whose status is still DEFER, carry on to the
3844 next host/IPaddress, unless we have tried the number of hosts given
3845 by hosts_max_try or hosts_max_try_hardlimit; otherwise return. Note that
3846 there is some fancy logic for hosts_max_try that means its limit can be
3847 overstepped in some circumstances.
3848
3849 If we get to the end of the list, all hosts have deferred at least one address,
3850 or not reached their retry times. If delay_after_cutoff is unset, it requests a
3851 delivery attempt to those hosts whose last try was before the arrival time of
3852 the current message. To cope with this, we have to go round the loop a second
3853 time. After that, set the status and error data for any addresses that haven't
3854 had it set already. */
3855
3856 for (cutoff_retry = 0;
3857 expired && cutoff_retry < (ob->delay_after_cutoff ? 1 : 2);
3858 cutoff_retry++)
3859 {
3860 host_item *nexthost = NULL;
3861 int unexpired_hosts_tried = 0;
3862
3863 for (host = hostlist;
3864 host
3865 && unexpired_hosts_tried < ob->hosts_max_try
3866 && total_hosts_tried < ob->hosts_max_try_hardlimit;
3867 host = nexthost)
3868 {
3869 int rc;
3870 int host_af;
3871 uschar *rs;
3872 BOOL host_is_expired = FALSE;
3873 BOOL message_defer = FALSE;
3874 BOOL some_deferred = FALSE;
3875 address_item *first_addr = NULL;
3876 uschar *interface = NULL;
3877 uschar *retry_host_key = NULL;
3878 uschar *retry_message_key = NULL;
3879 uschar *serialize_key = NULL;
3880
3881 /* Default next host is next host. :-) But this can vary if the
3882 hosts_max_try limit is hit (see below). It may also be reset if a host
3883 address is looked up here (in case the host was multihomed). */
3884
3885 nexthost = host->next;
3886
3887 /* If the address hasn't yet been obtained from the host name, look it up
3888 now, unless the host is already marked as unusable. If it is marked as
3889 unusable, it means that the router was unable to find its IP address (in
3890 the DNS or wherever) OR we are in the 2nd time round the cutoff loop, and
3891 the lookup failed last time. We don't get this far if *all* MX records
3892 point to non-existent hosts; that is treated as a hard error.
3893
3894 We can just skip this host entirely. When the hosts came from the router,
3895 the address will timeout based on the other host(s); when the address is
3896 looked up below, there is an explicit retry record added.
3897
3898 Note that we mustn't skip unusable hosts if the address is not unset; they
3899 may be needed as expired hosts on the 2nd time round the cutoff loop. */
3900
3901 if (!host->address)
3902 {
3903 int new_port, flags;
3904 host_item *hh;
3905
3906 if (host->status >= hstatus_unusable)
3907 {
3908 DEBUG(D_transport) debug_printf("%s has no address and is unusable - skipping\n",
3909 host->name);
3910 continue;
3911 }
3912
3913 DEBUG(D_transport) debug_printf("getting address for %s\n", host->name);
3914
3915 /* The host name is permitted to have an attached port. Find it, and
3916 strip it from the name. Just remember it for now. */
3917
3918 new_port = host_item_get_port(host);
3919
3920 /* Count hosts looked up */
3921
3922 hosts_looked_up++;
3923
3924 /* Find by name if so configured, or if it's an IP address. We don't
3925 just copy the IP address, because we need the test-for-local to happen. */
3926
3927 flags = HOST_FIND_BY_A;
3928 if (ob->dns_qualify_single) flags |= HOST_FIND_QUALIFY_SINGLE;
3929 if (ob->dns_search_parents) flags |= HOST_FIND_SEARCH_PARENTS;
3930
3931 if (ob->gethostbyname || string_is_ip_address(host->name, NULL) != 0)
3932 rc = host_find_byname(host, NULL, flags, NULL, TRUE);
3933 else
3934 rc = host_find_bydns(host, NULL, flags, NULL, NULL, NULL,
3935 &ob->dnssec, /* domains for request/require */
3936 NULL, NULL);
3937
3938 /* Update the host (and any additional blocks, resulting from
3939 multihoming) with a host-specific port, if any. */
3940
3941 for (hh = host; hh != nexthost; hh = hh->next) hh->port = new_port;
3942
3943 /* Failure to find the host at this time (usually DNS temporary failure)
3944 is really a kind of routing failure rather than a transport failure.
3945 Therefore we add a retry item of the routing kind, not to stop us trying
3946 to look this name up here again, but to ensure the address gets timed
3947 out if the failures go on long enough. A complete failure at this point
3948 commonly points to a configuration error, but the best action is still
3949 to carry on for the next host. */
3950
3951 if (rc == HOST_FIND_AGAIN || rc == HOST_FIND_SECURITY || rc == HOST_FIND_FAILED)
3952 {
3953 retry_add_item(addrlist, string_sprintf("R:%s", host->name), 0);
3954 expired = FALSE;
3955 if (rc == HOST_FIND_AGAIN) hosts_defer++; else hosts_fail++;
3956 DEBUG(D_transport) debug_printf("rc = %s for %s\n", (rc == HOST_FIND_AGAIN)?
3957 "HOST_FIND_AGAIN" : "HOST_FIND_FAILED", host->name);
3958 host->status = hstatus_unusable;
3959
3960 for (addr = addrlist; addr; addr = addr->next)
3961 {
3962 if (addr->transport_return != DEFER) continue;
3963 addr->basic_errno = ERRNO_UNKNOWNHOST;
3964 addr->message = string_sprintf(
3965 rc == HOST_FIND_SECURITY
3966 ? "lookup of IP address for %s was insecure"
3967 : "failed to lookup IP address for %s",
3968 host->name);
3969 }
3970 continue;
3971 }
3972
3973 /* If the host is actually the local host, we may have a problem, or
3974 there may be some cunning configuration going on. In the problem case,
3975 log things and give up. The default transport status is already DEFER. */
3976
3977 if (rc == HOST_FOUND_LOCAL && !ob->allow_localhost)
3978 {
3979 for (addr = addrlist; addr; addr = addr->next)
3980 {
3981 addr->basic_errno = 0;
3982 addr->message = string_sprintf("%s transport found host %s to be "
3983 "local", tblock->name, host->name);
3984 }
3985 goto END_TRANSPORT;
3986 }
3987 } /* End of block for IP address lookup */
3988
3989 /* If this is a continued delivery, we are interested only in the host
3990 which matches the name of the existing open channel. The check is put
3991 here after the local host lookup, in case the name gets expanded as a
3992 result of the lookup. Set expired FALSE, to save the outer loop executing
3993 twice. */
3994
3995 if ( continue_hostname
3996 && ( Ustrcmp(continue_hostname, host->name) != 0
3997 || Ustrcmp(continue_host_address, host->address) != 0
3998 ) )
3999 {
4000 expired = FALSE;
4001 continue; /* With next host */
4002 }
4003
4004 /* Reset the default next host in case a multihomed host whose addresses
4005 are not looked up till just above added to the host list. */
4006
4007 nexthost = host->next;
4008
4009 /* If queue_smtp is set (-odqs or the first part of a 2-stage run), or the
4010 domain is in queue_smtp_domains, we don't actually want to attempt any
4011 deliveries. When doing a queue run, queue_smtp_domains is always unset. If
4012 there is a lookup defer in queue_smtp_domains, proceed as if the domain
4013 were not in it. We don't want to hold up all SMTP deliveries! Except when
4014 doing a two-stage queue run, don't do this if forcing. */
4015
4016 if ((!deliver_force || queue_2stage) && (queue_smtp ||
4017 match_isinlist(addrlist->domain,
4018 (const uschar **)&queue_smtp_domains, 0,
4019 &domainlist_anchor, NULL, MCL_DOMAIN, TRUE, NULL) == OK))
4020 {
4021 expired = FALSE;
4022 for (addr = addrlist; addr; addr = addr->next)
4023 if (addr->transport_return == DEFER)
4024 addr->message = US"domain matches queue_smtp_domains, or -odqs set";
4025 continue; /* With next host */
4026 }
4027
4028 /* Count hosts being considered - purely for an intelligent comment
4029 if none are usable. */
4030
4031 hosts_total++;
4032
4033 /* Set $host and $host address now in case they are needed for the
4034 interface expansion or the serialize_hosts check; they remain set if an
4035 actual delivery happens. */
4036
4037 deliver_host = host->name;
4038 deliver_host_address = host->address;
4039 lookup_dnssec_authenticated = host->dnssec == DS_YES ? US"yes"
4040 : host->dnssec == DS_NO ? US"no"
4041 : US"";
4042
4043 /* Set up a string for adding to the retry key if the port number is not
4044 the standard SMTP port. A host may have its own port setting that overrides
4045 the default. */
4046
4047 pistring = string_sprintf(":%d", host->port == PORT_NONE
4048 ? port : host->port);
4049 if (Ustrcmp(pistring, ":25") == 0) pistring = US"";
4050
4051 /* Select IPv4 or IPv6, and choose an outgoing interface. If the interface
4052 string is set, even if constant (as different transports can have different
4053 constant settings), we must add it to the key that is used for retries,
4054 because connections to the same host from a different interface should be
4055 treated separately. */
4056
4057 host_af = Ustrchr(host->address, ':') == NULL ? AF_INET : AF_INET6;
4058 if ((rs = ob->interface) && *rs)
4059 {
4060 if (!smtp_get_interface(rs, host_af, addrlist, &interface, tid))
4061 return FALSE;
4062 pistring = string_sprintf("%s/%s", pistring, interface);
4063 }
4064
4065 /* The first time round the outer loop, check the status of the host by
4066 inspecting the retry data. The second time round, we are interested only
4067 in expired hosts that haven't been tried since this message arrived. */
4068
4069 if (cutoff_retry == 0)
4070 {
4071 BOOL incl_ip;
4072 /* Ensure the status of the address is set by checking retry data if
4073 necessary. There may be host-specific retry data (applicable to all
4074 messages) and also data for retries of a specific message at this host.
4075 If either of these retry records are actually read, the keys used are
4076 returned to save recomputing them later. */
4077
4078 if (exp_bool(addrlist, US"transport", tblock->name, D_transport,
4079 US"retry_include_ip_address", ob->retry_include_ip_address,
4080 ob->expand_retry_include_ip_address, &incl_ip) != OK)
4081 continue; /* with next host */
4082
4083 host_is_expired = retry_check_address(addrlist->domain, host, pistring,
4084 incl_ip, &retry_host_key, &retry_message_key);
4085
4086 DEBUG(D_transport) debug_printf("%s [%s]%s retry-status = %s\n", host->name,
4087 (host->address == NULL)? US"" : host->address, pistring,
4088 (host->status == hstatus_usable)? "usable" :
4089 (host->status == hstatus_unusable)? "unusable" :
4090 (host->status == hstatus_unusable_expired)? "unusable (expired)" : "?");
4091
4092 /* Skip this address if not usable at this time, noting if it wasn't
4093 actually expired, both locally and in the address. */
4094
4095 switch (host->status)
4096 {
4097 case hstatus_unusable:
4098 expired = FALSE;
4099 setflag(addrlist, af_retry_skipped);
4100 /* Fall through */
4101
4102 case hstatus_unusable_expired:
4103 switch (host->why)
4104 {
4105 case hwhy_retry: hosts_retry++; break;
4106 case hwhy_failed: hosts_fail++; break;
4107 case hwhy_insecure:
4108 case hwhy_deferred: hosts_defer++; break;
4109 }
4110
4111 /* If there was a retry message key, implying that previously there
4112 was a message-specific defer, we don't want to update the list of
4113 messages waiting for these hosts. */
4114
4115 if (retry_message_key) update_waiting = FALSE;
4116 continue; /* With the next host or IP address */
4117 }
4118 }
4119
4120 /* Second time round the loop: if the address is set but expired, and
4121 the message is newer than the last try, let it through. */
4122
4123 else
4124 {
4125 if ( !host->address
4126 || host->status != hstatus_unusable_expired
4127 || host->last_try > received_time)
4128 continue;
4129 DEBUG(D_transport) debug_printf("trying expired host %s [%s]%s\n",
4130 host->name, host->address, pistring);
4131 host_is_expired = TRUE;
4132 }
4133
4134 /* Setting "expired=FALSE" doesn't actually mean not all hosts are expired;
4135 it remains TRUE only if all hosts are expired and none are actually tried.
4136 */
4137
4138 expired = FALSE;
4139
4140 /* If this host is listed as one to which access must be serialized,
4141 see if another Exim process has a connection to it, and if so, skip
4142 this host. If not, update the database to record our connection to it
4143 and remember this for later deletion. Do not do any of this if we are
4144 sending the message down a pre-existing connection. */
4145
4146 if ( !continue_hostname
4147 && verify_check_given_host(&ob->serialize_hosts, host) == OK)
4148 {
4149 serialize_key = string_sprintf("host-serialize-%s", host->name);
4150 if (!enq_start(serialize_key, 1))
4151 {
4152 DEBUG(D_transport)
4153 debug_printf("skipping host %s because another Exim process "
4154 "is connected to it\n", host->name);
4155 hosts_serial++;
4156 continue;
4157 }
4158 }
4159
4160 /* OK, we have an IP address that is not waiting for its retry time to
4161 arrive (it might be expired) OR (second time round the loop) we have an
4162 expired host that hasn't been tried since the message arrived. Have a go
4163 at delivering the message to it. First prepare the addresses by flushing
4164 out the result of previous attempts, and finding the first address that
4165 is still to be delivered. */
4166
4167 first_addr = prepare_addresses(addrlist, host);
4168
4169 DEBUG(D_transport) debug_printf("delivering %s to %s [%s] (%s%s)\n",
4170 message_id, host->name, host->address, addrlist->address,
4171 addrlist->next ? ", ..." : "");
4172
4173 set_process_info("delivering %s to %s [%s] (%s%s)",
4174 message_id, host->name, host->address, addrlist->address,
4175 addrlist->next ? ", ..." : "");
4176
4177 /* This is not for real; don't do the delivery. If there are
4178 any remaining hosts, list them. */
4179
4180 if (dont_deliver)
4181 {
4182 host_item *host2;
4183 set_errno_nohost(addrlist, 0, NULL, OK, FALSE);
4184 for (addr = addrlist; addr; addr = addr->next)
4185 {
4186 addr->host_used = host;
4187 addr->special_action = '*';
4188 addr->message = US"delivery bypassed by -N option";
4189 }
4190 DEBUG(D_transport)
4191 {
4192 debug_printf("*** delivery by %s transport bypassed by -N option\n"
4193 "*** host and remaining hosts:\n", tblock->name);
4194 for (host2 = host; host2; host2 = host2->next)
4195 debug_printf(" %s [%s]\n", host2->name,
4196 host2->address ? host2->address : US"unset");
4197 }
4198 rc = OK;
4199 }
4200
4201 /* This is for real. If the host is expired, we don't count it for
4202 hosts_max_retry. This ensures that all hosts must expire before an address
4203 is timed out, unless hosts_max_try_hardlimit (which protects against
4204 lunatic DNS configurations) is reached.
4205
4206 If the host is not expired and we are about to hit the hosts_max_retry
4207 limit, check to see if there is a subsequent hosts with a different MX
4208 value. If so, make that the next host, and don't count this one. This is a
4209 heuristic to make sure that different MXs do get tried. With a normal kind
4210 of retry rule, they would get tried anyway when the earlier hosts were
4211 delayed, but if the domain has a "retry every time" type of rule - as is
4212 often used for the the very large ISPs, that won't happen. */
4213
4214 else
4215 {
4216 host_item * thost;
4217 /* Make a copy of the host if it is local to this invocation
4218 of the transport. */
4219
4220 if (expanded_hosts)
4221 {
4222 thost = store_get(sizeof(host_item));
4223 *thost = *host;
4224 thost->name = string_copy(host->name);
4225 thost->address = string_copy(host->address);
4226 }
4227 else
4228 thost = host;
4229
4230 if (!host_is_expired && ++unexpired_hosts_tried >= ob->hosts_max_try)
4231 {
4232 host_item *h;
4233 DEBUG(D_transport)
4234 debug_printf("hosts_max_try limit reached with this host\n");
4235 for (h = host; h; h = h->next) if (h->mx != host->mx)
4236 {
4237 nexthost = h;
4238 unexpired_hosts_tried--;
4239 DEBUG(D_transport) debug_printf("however, a higher MX host exists "
4240 "and will be tried\n");
4241 break;
4242 }
4243 }
4244
4245 /* Attempt the delivery. */
4246
4247 total_hosts_tried++;
4248 rc = smtp_deliver(addrlist, thost, host_af, port, interface, tblock,
4249 &message_defer, FALSE);
4250
4251 /* Yield is one of:
4252 OK => connection made, each address contains its result;
4253 message_defer is set for message-specific defers (when all
4254 recipients are marked defer)
4255 DEFER => there was a non-message-specific delivery problem;
4256 ERROR => there was a problem setting up the arguments for a filter,
4257 or there was a problem with expanding added headers
4258 */
4259
4260 /* If the result is not OK, there was a non-message-specific problem.
4261 If the result is DEFER, we need to write to the logs saying what happened
4262 for this particular host, except in the case of authentication and TLS
4263 failures, where the log has already been written. If all hosts defer a
4264 general message is written at the end. */
4265
4266 if (rc == DEFER && first_addr->basic_errno != ERRNO_AUTHFAIL
4267 && first_addr->basic_errno != ERRNO_TLSFAILURE)
4268 write_logs(first_addr, host);
4269
4270 #ifndef DISABLE_EVENT
4271 if (rc == DEFER)
4272 deferred_event_raise(first_addr, host);
4273 #endif
4274
4275 /* If STARTTLS was accepted, but there was a failure in setting up the
4276 TLS session (usually a certificate screwup), and the host is not in
4277 hosts_require_tls, and tls_tempfail_tryclear is true, try again, with
4278 TLS forcibly turned off. We have to start from scratch with a new SMTP
4279 connection. That's why the retry is done from here, not from within
4280 smtp_deliver(). [Rejections of STARTTLS itself don't screw up the
4281 session, so the in-clear transmission after those errors, if permitted,
4282 happens inside smtp_deliver().] */
4283
4284 #ifdef SUPPORT_TLS
4285 if ( rc == DEFER
4286 && first_addr->basic_errno == ERRNO_TLSFAILURE
4287 && ob->tls_tempfail_tryclear
4288 && verify_check_given_host(&ob->hosts_require_tls, host) != OK
4289 )
4290 {
4291 log_write(0, LOG_MAIN,
4292 "%s: delivering unencrypted to H=%s [%s] (not in hosts_require_tls)",
4293 first_addr->message, host->name, host->address);
4294 first_addr = prepare_addresses(addrlist, host);
4295 rc = smtp_deliver(addrlist, thost, host_af, port, interface, tblock,
4296 &message_defer, TRUE);
4297 if (rc == DEFER && first_addr->basic_errno != ERRNO_AUTHFAIL)
4298 write_logs(first_addr, host);
4299 # ifndef DISABLE_EVENT
4300 if (rc == DEFER)
4301 deferred_event_raise(first_addr, host);
4302 # endif
4303 }
4304 #endif /*SUPPORT_TLS*/
4305 }
4306
4307 /* Delivery attempt finished */
4308
4309 rs = rc == OK ? US"OK"
4310 : rc == DEFER ? US"DEFER"
4311 : rc == ERROR ? US"ERROR"
4312 : US"?";
4313
4314 set_process_info("delivering %s: just tried %s [%s] for %s%s: result %s",
4315 message_id, host->name, host->address, addrlist->address,
4316 addrlist->next ? " (& others)" : "", rs);
4317
4318 /* Release serialization if set up */
4319
4320 if (serialize_key) enq_end(serialize_key);
4321
4322 /* If the result is DEFER, or if a host retry record is known to exist, we
4323 need to add an item to the retry chain for updating the retry database
4324 at the end of delivery. We only need to add the item to the top address,
4325 of course. Also, if DEFER, we mark the IP address unusable so as to skip it
4326 for any other delivery attempts using the same address. (It is copied into
4327 the unusable tree at the outer level, so even if different address blocks
4328 contain the same address, it still won't get tried again.) */
4329
4330 if (rc == DEFER || retry_host_key)
4331 {
4332 int delete_flag = rc != DEFER ? rf_delete : 0;
4333 if (!retry_host_key)
4334 {
4335 BOOL incl_ip;
4336 if (exp_bool(addrlist, US"transport", tblock->name, D_transport,
4337 US"retry_include_ip_address", ob->retry_include_ip_address,
4338 ob->expand_retry_include_ip_address, &incl_ip) != OK)
4339 incl_ip = TRUE; /* error; use most-specific retry record */
4340
4341 retry_host_key = incl_ip
4342 ? string_sprintf("T:%S:%s%s", host->name, host->address, pistring)
4343 : string_sprintf("T:%S%s", host->name, pistring);
4344 }
4345
4346 /* If a delivery of another message over an existing SMTP connection
4347 yields DEFER, we do NOT set up retry data for the host. This covers the
4348 case when there are delays in routing the addresses in the second message
4349 that are so long that the server times out. This is alleviated by not
4350 routing addresses that previously had routing defers when handling an
4351 existing connection, but even so, this case may occur (e.g. if a
4352 previously happily routed address starts giving routing defers). If the
4353 host is genuinely down, another non-continued message delivery will
4354 notice it soon enough. */
4355
4356 if (delete_flag != 0 || !continue_hostname)
4357 retry_add_item(first_addr, retry_host_key, rf_host | delete_flag);
4358
4359 /* We may have tried an expired host, if its retry time has come; ensure
4360 the status reflects the expiry for the benefit of any other addresses. */
4361
4362 if (rc == DEFER)
4363 {
4364 host->status = host_is_expired
4365 ? hstatus_unusable_expired : hstatus_unusable;
4366 host->why = hwhy_deferred;
4367 }
4368 }
4369
4370 /* If message_defer is set (host was OK, but every recipient got deferred
4371 because of some message-specific problem), or if that had happened
4372 previously so that a message retry key exists, add an appropriate item
4373 to the retry chain. Note that if there was a message defer but now there is
4374 a host defer, the message defer record gets deleted. That seems perfectly
4375 reasonable. Also, stop the message from being remembered as waiting
4376 for specific hosts. */
4377
4378 if (message_defer || retry_message_key)
4379 {
4380 int delete_flag = message_defer ? 0 : rf_delete;
4381 if (!retry_message_key)
4382 {
4383 BOOL incl_ip;
4384 if (exp_bool(addrlist, US"transport", tblock->name, D_transport,
4385 US"retry_include_ip_address", ob->retry_include_ip_address,
4386 ob->expand_retry_include_ip_address, &incl_ip) != OK)
4387 incl_ip = TRUE; /* error; use most-specific retry record */
4388
4389 retry_message_key = incl_ip
4390 ? string_sprintf("T:%S:%s%s:%s", host->name, host->address, pistring,
4391 message_id)
4392 : string_sprintf("T:%S%s:%s", host->name, pistring, message_id);
4393 }
4394 retry_add_item(addrlist, retry_message_key,
4395 rf_message | rf_host | delete_flag);
4396 update_waiting = FALSE;
4397 }
4398
4399 /* Any return other than DEFER (that is, OK or ERROR) means that the
4400 addresses have got their final statuses filled in for this host. In the OK
4401 case, see if any of them are deferred. */
4402
4403 if (rc == OK)
4404 for (addr = addrlist; addr; addr = addr->next)
4405 if (addr->transport_return == DEFER)
4406 {
4407 some_deferred = TRUE;
4408 break;
4409 }
4410
4411 /* If no addresses deferred or the result was ERROR, return. We do this for
4412 ERROR because a failing filter set-up or add_headers expansion is likely to
4413 fail for any host we try. */
4414
4415 if (rc == ERROR || (rc == OK && !some_deferred))
4416 {
4417 DEBUG(D_transport) debug_printf("Leaving %s transport\n", tblock->name);
4418 return TRUE; /* Each address has its status */
4419 }
4420
4421 /* If the result was DEFER or some individual addresses deferred, let
4422 the loop run to try other hosts with the deferred addresses, except for the
4423 case when we were trying to deliver down an existing channel and failed.
4424 Don't try any other hosts in this case. */
4425
4426 if (continue_hostname) break;
4427
4428 /* If the whole delivery, or some individual addresses, were deferred and
4429 there are more hosts that could be tried, do not count this host towards
4430 the hosts_max_try limit if the age of the message is greater than the
4431 maximum retry time for this host. This means we may try try all hosts,
4432 ignoring the limit, when messages have been around for some time. This is
4433 important because if we don't try all hosts, the address will never time
4434 out. NOTE: this does not apply to hosts_max_try_hardlimit. */
4435
4436 if ((rc == DEFER || some_deferred) && nexthost)
4437 {
4438 BOOL timedout;
4439 retry_config *retry = retry_find_config(host->name, NULL, 0, 0);
4440
4441 if (retry && retry->rules)
4442 {
4443 retry_rule *last_rule;
4444 for (last_rule = retry->rules;
4445 last_rule->next;
4446 last_rule = last_rule->next);
4447 timedout = time(NULL) - received_time > last_rule->timeout;
4448 }
4449 else timedout = TRUE; /* No rule => timed out */
4450
4451 if (timedout)
4452 {
4453 unexpired_hosts_tried--;
4454 DEBUG(D_transport) debug_printf("temporary delivery error(s) override "
4455 "hosts_max_try (message older than host's retry time)\n");
4456 }
4457 }
4458 } /* End of loop for trying multiple hosts. */
4459
4460 /* This is the end of the loop that repeats iff expired is TRUE and
4461 ob->delay_after_cutoff is FALSE. The second time round we will
4462 try those hosts that haven't been tried since the message arrived. */
4463
4464 DEBUG(D_transport)
4465 {
4466 debug_printf("all IP addresses skipped or deferred at least one address\n");
4467 if (expired && !ob->delay_after_cutoff && cutoff_retry == 0)
4468 debug_printf("retrying IP addresses not tried since message arrived\n");
4469 }
4470 }
4471
4472
4473 /* Get here if all IP addresses are skipped or defer at least one address. In
4474 MUA wrapper mode, this will happen only for connection or other non-message-
4475 specific failures. Force the delivery status for all addresses to FAIL. */
4476
4477 if (mua_wrapper)
4478 {
4479 for (addr = addrlist; addr; addr = addr->next)
4480 addr->transport_return = FAIL;
4481 goto END_TRANSPORT;
4482 }
4483
4484 /* In the normal, non-wrapper case, add a standard message to each deferred
4485 address if there hasn't been an error, that is, if it hasn't actually been
4486 tried this time. The variable "expired" will be FALSE if any deliveries were
4487 actually tried, or if there was at least one host that was not expired. That
4488 is, it is TRUE only if no deliveries were tried and all hosts were expired. If
4489 a delivery has been tried, an error code will be set, and the failing of the
4490 message is handled by the retry code later.
4491
4492 If queue_smtp is set, or this transport was called to send a subsequent message
4493 down an existing TCP/IP connection, and something caused the host not to be
4494 found, we end up here, but can detect these cases and handle them specially. */
4495
4496 for (addr = addrlist; addr; addr = addr->next)
4497 {
4498 /* If host is not NULL, it means that we stopped processing the host list
4499 because of hosts_max_try or hosts_max_try_hardlimit. In the former case, this
4500 means we need to behave as if some hosts were skipped because their retry
4501 time had not come. Specifically, this prevents the address from timing out.
4502 However, if we have hit hosts_max_try_hardlimit, we want to behave as if all
4503 hosts were tried. */
4504
4505 if (host)
4506 if (total_hosts_tried >= ob->hosts_max_try_hardlimit)
4507 {
4508 DEBUG(D_transport)
4509 debug_printf("hosts_max_try_hardlimit reached: behave as if all "
4510 "hosts were tried\n");
4511 }
4512 else
4513 {
4514 DEBUG(D_transport)
4515 debug_printf("hosts_max_try limit caused some hosts to be skipped\n");
4516 setflag(addr, af_retry_skipped);
4517 }
4518
4519 if (queue_smtp) /* no deliveries attempted */
4520 {
4521 addr->transport_return = DEFER;
4522 addr->basic_errno = 0;
4523 addr->message = US"SMTP delivery explicitly queued";
4524 }
4525
4526 else if ( addr->transport_return == DEFER
4527 && (addr->basic_errno == ERRNO_UNKNOWNERROR || addr->basic_errno == 0)
4528 && !addr->message
4529 )
4530 {
4531 addr->basic_errno = ERRNO_HRETRY;
4532 if (continue_hostname)
4533 addr->message = US"no host found for existing SMTP connection";
4534 else if (expired)
4535 {
4536 setflag(addr, af_pass_message); /* This is not a security risk */
4537 addr->message = string_sprintf(
4538 "all hosts%s have been failing for a long time %s",
4539 addr->domain ? string_sprintf(" for '%s'", addr->domain) : US"",
4540 ob->delay_after_cutoff
4541 ? US"(and retry time not reached)"
4542 : US"and were last tried after this message arrived");
4543
4544 /* If we are already using fallback hosts, or there are no fallback hosts
4545 defined, convert the result to FAIL to cause a bounce. */
4546
4547 if (addr->host_list == addr->fallback_hosts || !addr->fallback_hosts)
4548 addr->transport_return = FAIL;
4549 }
4550 else
4551 {
4552 const char * s;
4553 if (hosts_retry == hosts_total)
4554 s = "retry time not reached for any host%s";
4555 else if (hosts_fail == hosts_total)
4556 s = "all host address lookups%s failed permanently";
4557 else if (hosts_defer == hosts_total)
4558 s = "all host address lookups%s failed temporarily";
4559 else if (hosts_serial == hosts_total)
4560 s = "connection limit reached for all hosts%s";
4561 else if (hosts_fail+hosts_defer == hosts_total)
4562 s = "all host address lookups%s failed";
4563 else
4564 s = "some host address lookups failed and retry time "
4565 "not reached for other hosts or connection limit reached%s";
4566
4567 addr->message = string_sprintf(s,
4568 addr->domain ? string_sprintf(" for '%s'", addr->domain) : US"");
4569 }
4570 }
4571 }
4572
4573 /* Update the database which keeps information about which messages are waiting
4574 for which hosts to become available. For some message-specific errors, the
4575 update_waiting flag is turned off because we don't want follow-on deliveries in
4576 those cases. If this transport instance is explicitly limited to one message
4577 per connection then follow-on deliveries are not possible and there's no need
4578 to create/update the per-transport wait-<transport_name> database. */
4579
4580 if (update_waiting && tblock->connection_max_messages != 1)
4581 transport_update_waiting(hostlist, tblock->name);
4582
4583 END_TRANSPORT:
4584
4585 DEBUG(D_transport) debug_printf("Leaving %s transport\n", tblock->name);
4586
4587 return TRUE; /* Each address has its status */
4588 }
4589
4590 /* vi: aw ai sw=2
4591 */
4592 /* End of transport/smtp.c */
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