projects / exim.git / blob
? search:


c4626b3e99079b5744703267def7f2ef3f6c42d5
[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) addr = addr->next;
800
801 /* The address was accepted */
802 addr->host_used = sx->host;
803
804 if (smtp_read_response(&sx->inblock, sx->buffer, sizeof(sx->buffer),
805 '2', ob->command_timeout))
806 {
807 yield |= 1;
808 addr->transport_return = PENDING_OK;
809
810 /* If af_dr_retry_exists is set, there was a routing delay on this address;
811 ensure that any address-specific retry record is expunged. We do this both
812 for the basic key and for the version that also includes the sender. */
813
814 if (testflag(addr, af_dr_retry_exists))
815 {
816 uschar *altkey = string_sprintf("%s:<%s>", addr->address_retry_key,
817 sender_address);
818 retry_add_item(addr, altkey, rf_delete);
819 retry_add_item(addr, addr->address_retry_key, rf_delete);
820 }
821 }
822
823 /* Timeout while reading the response */
824
825 else if (errno == ETIMEDOUT)
826 {
827 uschar *message = string_sprintf("SMTP timeout after RCPT TO:<%s>",
828 transport_rcpt_address(addr, sx->tblock->rcpt_include_affixes));
829 set_errno_nohost(sx->first_addr, ETIMEDOUT, message, DEFER, FALSE);
830 retry_add_item(addr, addr->address_retry_key, 0);
831 update_waiting = FALSE;
832 return -1;
833 }
834
835 /* Handle other errors in obtaining an SMTP response by returning -1. This
836 will cause all the addresses to be deferred. Restore the SMTP command in
837 big_buffer for which we are checking the response, so the error message
838 makes sense. */
839
840 else if (errno != 0 || sx->buffer[0] == 0)
841 {
842 string_format(big_buffer, big_buffer_size, "RCPT TO:<%s>",
843 transport_rcpt_address(addr, sx->tblock->rcpt_include_affixes));
844 return -2;
845 }
846
847 /* Handle SMTP permanent and temporary response codes. */
848
849 else
850 {
851 addr->message =
852 string_sprintf("SMTP error from remote mail server after RCPT TO:<%s>: "
853 "%s", transport_rcpt_address(addr, sx->tblock->rcpt_include_affixes),
854 string_printing(sx->buffer));
855 setflag(addr, af_pass_message);
856 if (!sx->verify)
857 msglog_line(sx->host, addr->message);
858
859 /* The response was 5xx */
860
861 if (sx->buffer[0] == '5')
862 {
863 addr->transport_return = FAIL;
864 yield |= 2;
865 }
866
867 /* The response was 4xx */
868
869 else
870 {
871 addr->transport_return = DEFER;
872 addr->basic_errno = ERRNO_RCPT4XX;
873 addr->more_errno |= ((sx->buffer[1] - '0')*10 + sx->buffer[2] - '0') << 8;
874
875 if (!sx->verify)
876 {
877 #ifndef DISABLE_EVENT
878 event_defer_errno = addr->more_errno;
879 msg_event_raise(US"msg:rcpt:host:defer", addr);
880 #endif
881
882 /* Log temporary errors if there are more hosts to be tried.
883 If not, log this last one in the == line. */
884
885 if (sx->host->next)
886 log_write(0, LOG_MAIN, "H=%s [%s]: %s",
887 sx->host->name, sx->host->address, addr->message);
888
889 #ifndef DISABLE_EVENT
890 else
891 msg_event_raise(US"msg:rcpt:defer", addr);
892 #endif
893
894 /* Do not put this message on the list of those waiting for specific
895 hosts, as otherwise it is likely to be tried too often. */
896
897 update_waiting = FALSE;
898
899 /* Add a retry item for the address so that it doesn't get tried again
900 too soon. If address_retry_include_sender is true, add the sender address
901 to the retry key. */
902
903 retry_add_item(addr,
904 ob->address_retry_include_sender
905 ? string_sprintf("%s:<%s>", addr->address_retry_key, sender_address)
906 : addr->address_retry_key,
907 0);
908 }
909 }
910 }
911 } /* Loop for next RCPT response */
912
913 /* Update where to start at for the next block of responses, unless we
914 have already handled all the addresses. */
915
916 if (addr) sx->sync_addr = addr->next;
917
918 /* Handle a response to DATA. If we have not had any good recipients, either
919 previously or in this block, the response is ignored. */
920
921 if (pending_DATA != 0 &&
922 !smtp_read_response(&sx->inblock, sx->buffer, sizeof(sx->buffer),
923 '3', ob->command_timeout))
924 {
925 int code;
926 uschar *msg;
927 BOOL pass_message;
928 if (pending_DATA > 0 || (yield & 1) != 0)
929 {
930 if (errno == 0 && sx->buffer[0] == '4')
931 {
932 errno = ERRNO_DATA4XX;
933 sx->first_addr->more_errno |= ((sx->buffer[1] - '0')*10 + sx->buffer[2] - '0') << 8;
934 }
935 return -3;
936 }
937 (void)check_response(sx->host, &errno, 0, sx->buffer, &code, &msg, &pass_message);
938 DEBUG(D_transport) debug_printf("%s\nerror for DATA ignored: pipelining "
939 "is in use and there were no good recipients\n", msg);
940 }
941
942 /* All responses read and handled; MAIL (if present) received 2xx and DATA (if
943 present) received 3xx. If any RCPTs were handled and yielded anything other
944 than 4xx, yield will be set non-zero. */
945
946 return yield;
947 }
948
949
950
951 /* Do the client side of smtp-level authentication */
952 /*
953 Arguments:
954 buffer EHLO response from server (gets overwritten)
955 addrlist chain of potential addresses to deliver
956 host host to deliver to
957 ob transport options
958 ibp, obp comms channel control blocks
959
960 Returns:
961 OK Success, or failed (but not required): global "smtp_authenticated" set
962 DEFER Failed authentication (and was required)
963 ERROR Internal problem
964
965 FAIL_SEND Failed communications - transmit
966 FAIL - response
967 */
968
969 int
970 smtp_auth(uschar *buffer, unsigned bufsize, address_item *addrlist, host_item *host,
971 smtp_transport_options_block *ob, BOOL is_esmtp,
972 smtp_inblock *ibp, smtp_outblock *obp)
973 {
974 int require_auth;
975 uschar *fail_reason = US"server did not advertise AUTH support";
976
977 smtp_authenticated = FALSE;
978 client_authenticator = client_authenticated_id = client_authenticated_sender = NULL;
979 require_auth = verify_check_given_host(&ob->hosts_require_auth, host);
980
981 if (is_esmtp && !regex_AUTH) regex_AUTH =
982 regex_must_compile(US"\\n250[\\s\\-]AUTH\\s+([\\-\\w\\s]+)(?:\\n|$)",
983 FALSE, TRUE);
984
985 if (is_esmtp && regex_match_and_setup(regex_AUTH, buffer, 0, -1))
986 {
987 uschar *names = string_copyn(expand_nstring[1], expand_nlength[1]);
988 expand_nmax = -1; /* reset */
989
990 /* Must not do this check until after we have saved the result of the
991 regex match above. */
992
993 if (require_auth == OK ||
994 verify_check_given_host(&ob->hosts_try_auth, host) == OK)
995 {
996 auth_instance *au;
997 fail_reason = US"no common mechanisms were found";
998
999 DEBUG(D_transport) debug_printf("scanning authentication mechanisms\n");
1000
1001 /* Scan the configured authenticators looking for one which is configured
1002 for use as a client, which is not suppressed by client_condition, and
1003 whose name matches an authentication mechanism supported by the server.
1004 If one is found, attempt to authenticate by calling its client function.
1005 */
1006
1007 for (au = auths; !smtp_authenticated && au != NULL; au = au->next)
1008 {
1009 uschar *p = names;
1010 if (!au->client ||
1011 (au->client_condition != NULL &&
1012 !expand_check_condition(au->client_condition, au->name,
1013 US"client authenticator")))
1014 {
1015 DEBUG(D_transport) debug_printf("skipping %s authenticator: %s\n",
1016 au->name,
1017 (au->client)? "client_condition is false" :
1018 "not configured as a client");
1019 continue;
1020 }
1021
1022 /* Loop to scan supported server mechanisms */
1023
1024 while (*p != 0)
1025 {
1026 int rc;
1027 int len = Ustrlen(au->public_name);
1028 while (isspace(*p)) p++;
1029
1030 if (strncmpic(au->public_name, p, len) != 0 ||
1031 (p[len] != 0 && !isspace(p[len])))
1032 {
1033 while (*p != 0 && !isspace(*p)) p++;
1034 continue;
1035 }
1036
1037 /* Found data for a listed mechanism. Call its client entry. Set
1038 a flag in the outblock so that data is overwritten after sending so
1039 that reflections don't show it. */
1040
1041 fail_reason = US"authentication attempt(s) failed";
1042 obp->authenticating = TRUE;
1043 rc = (au->info->clientcode)(au, ibp, obp,
1044 ob->command_timeout, buffer, bufsize);
1045 obp->authenticating = FALSE;
1046 DEBUG(D_transport) debug_printf("%s authenticator yielded %d\n",
1047 au->name, rc);
1048
1049 /* A temporary authentication failure must hold up delivery to
1050 this host. After a permanent authentication failure, we carry on
1051 to try other authentication methods. If all fail hard, try to
1052 deliver the message unauthenticated unless require_auth was set. */
1053
1054 switch(rc)
1055 {
1056 case OK:
1057 smtp_authenticated = TRUE; /* stops the outer loop */
1058 client_authenticator = au->name;
1059 if (au->set_client_id != NULL)
1060 client_authenticated_id = expand_string(au->set_client_id);
1061 break;
1062
1063 /* Failure after writing a command */
1064
1065 case FAIL_SEND:
1066 return FAIL_SEND;
1067
1068 /* Failure after reading a response */
1069
1070 case FAIL:
1071 if (errno != 0 || buffer[0] != '5') return FAIL;
1072 log_write(0, LOG_MAIN, "%s authenticator failed H=%s [%s] %s",
1073 au->name, host->name, host->address, buffer);
1074 break;
1075
1076 /* Failure by some other means. In effect, the authenticator
1077 decided it wasn't prepared to handle this case. Typically this
1078 is the result of "fail" in an expansion string. Do we need to
1079 log anything here? Feb 2006: a message is now put in the buffer
1080 if logging is required. */
1081
1082 case CANCELLED:
1083 if (*buffer != 0)
1084 log_write(0, LOG_MAIN, "%s authenticator cancelled "
1085 "authentication H=%s [%s] %s", au->name, host->name,
1086 host->address, buffer);
1087 break;
1088
1089 /* Internal problem, message in buffer. */
1090
1091 case ERROR:
1092 set_errno_nohost(addrlist, ERRNO_AUTHPROB, string_copy(buffer),
1093 DEFER, FALSE);
1094 return ERROR;
1095 }
1096
1097 break; /* If not authenticated, try next authenticator */
1098 } /* Loop for scanning supported server mechanisms */
1099 } /* Loop for further authenticators */
1100 }
1101 }
1102
1103 /* If we haven't authenticated, but are required to, give up. */
1104
1105 if (require_auth == OK && !smtp_authenticated)
1106 {
1107 set_errno_nohost(addrlist, ERRNO_AUTHFAIL,
1108 string_sprintf("authentication required but %s", fail_reason), DEFER,
1109 FALSE);
1110 return DEFER;
1111 }
1112
1113 return OK;
1114 }
1115
1116
1117 /* Construct AUTH appendix string for MAIL TO */
1118 /*
1119 Arguments
1120 buffer to build string
1121 addrlist chain of potential addresses to deliver
1122 ob transport options
1123
1124 Globals smtp_authenticated
1125 client_authenticated_sender
1126 Return True on error, otherwise buffer has (possibly empty) terminated string
1127 */
1128
1129 BOOL
1130 smtp_mail_auth_str(uschar *buffer, unsigned bufsize, address_item *addrlist,
1131 smtp_transport_options_block *ob)
1132 {
1133 uschar *local_authenticated_sender = authenticated_sender;
1134
1135 #ifdef notdef
1136 debug_printf("smtp_mail_auth_str: as<%s> os<%s> SA<%s>\n", authenticated_sender, ob->authenticated_sender, smtp_authenticated?"Y":"N");
1137 #endif
1138
1139 if (ob->authenticated_sender != NULL)
1140 {
1141 uschar *new = expand_string(ob->authenticated_sender);
1142 if (new == NULL)
1143 {
1144 if (!expand_string_forcedfail)
1145 {
1146 uschar *message = string_sprintf("failed to expand "
1147 "authenticated_sender: %s", expand_string_message);
1148 set_errno_nohost(addrlist, ERRNO_EXPANDFAIL, message, DEFER, FALSE);
1149 return TRUE;
1150 }
1151 }
1152 else if (new[0] != 0) local_authenticated_sender = new;
1153 }
1154
1155 /* Add the authenticated sender address if present */
1156
1157 if ((smtp_authenticated || ob->authenticated_sender_force) &&
1158 local_authenticated_sender != NULL)
1159 {
1160 string_format(buffer, bufsize, " AUTH=%s",
1161 auth_xtextencode(local_authenticated_sender,
1162 Ustrlen(local_authenticated_sender)));
1163 client_authenticated_sender = string_copy(local_authenticated_sender);
1164 }
1165 else
1166 *buffer= 0;
1167
1168 return FALSE;
1169 }
1170
1171
1172
1173 #ifdef EXPERIMENTAL_DANE
1174 /* Lookup TLSA record for host/port.
1175 Return: OK success with dnssec; DANE mode
1176 DEFER Do not use this host now, may retry later
1177 FAIL_FORCED No TLSA record; DANE not usable
1178 FAIL Do not use this connection
1179 */
1180
1181 int
1182 tlsa_lookup(const host_item * host, dns_answer * dnsa, BOOL dane_required)
1183 {
1184 /* move this out to host.c given the similarity to dns_lookup() ? */
1185 uschar buffer[300];
1186 const uschar * fullname = buffer;
1187
1188 /* TLSA lookup string */
1189 (void)sprintf(CS buffer, "_%d._tcp.%.256s", host->port, host->name);
1190
1191 switch (dns_lookup(dnsa, buffer, T_TLSA, &fullname))
1192 {
1193 case DNS_SUCCEED:
1194 if (!dns_is_secure(dnsa))
1195 {
1196 log_write(0, LOG_MAIN, "DANE error: TLSA lookup not DNSSEC");
1197 return DEFER;
1198 }
1199 return OK;
1200
1201 case DNS_AGAIN:
1202 return DEFER; /* just defer this TLS'd conn */
1203
1204 case DNS_NODATA: /* no TLSA RR for this lookup */
1205 case DNS_NOMATCH: /* no records at all for this lookup */
1206 return dane_required ? FAIL : FAIL_FORCED;
1207
1208 default:
1209 case DNS_FAIL:
1210 return dane_required ? FAIL : DEFER;
1211 }
1212 }
1213 #endif
1214
1215
1216
1217 typedef struct smtp_compare_s
1218 {
1219 uschar *current_sender_address;
1220 struct transport_instance *tblock;
1221 } smtp_compare_t;
1222
1223
1224 /* Create a unique string that identifies this message, it is based on
1225 sender_address, helo_data and tls_certificate if enabled.
1226 */
1227
1228 static uschar *
1229 smtp_local_identity(uschar * sender, struct transport_instance * tblock)
1230 {
1231 address_item * addr1;
1232 uschar * if1 = US"";
1233 uschar * helo1 = US"";
1234 #ifdef SUPPORT_TLS
1235 uschar * tlsc1 = US"";
1236 #endif
1237 uschar * save_sender_address = sender_address;
1238 uschar * local_identity = NULL;
1239 smtp_transport_options_block * ob =
1240 (smtp_transport_options_block *)tblock->options_block;
1241
1242 sender_address = sender;
1243
1244 addr1 = deliver_make_addr (sender, TRUE);
1245 deliver_set_expansions(addr1);
1246
1247 if (ob->interface)
1248 if1 = expand_string(ob->interface);
1249
1250 if (ob->helo_data)
1251 helo1 = expand_string(ob->helo_data);
1252
1253 #ifdef SUPPORT_TLS
1254 if (ob->tls_certificate)
1255 tlsc1 = expand_string(ob->tls_certificate);
1256 local_identity = string_sprintf ("%s^%s^%s", if1, helo1, tlsc1);
1257 #else
1258 local_identity = string_sprintf ("%s^%s", if1, helo1);
1259 #endif
1260
1261 deliver_set_expansions(NULL);
1262 sender_address = save_sender_address;
1263
1264 return local_identity;
1265 }
1266
1267
1268
1269 /* This routine is a callback that is called from transport_check_waiting.
1270 This function will evaluate the incoming message versus the previous
1271 message. If the incoming message is using a different local identity then
1272 we will veto this new message. */
1273
1274 static BOOL
1275 smtp_are_same_identities(uschar * message_id, smtp_compare_t * s_compare)
1276 {
1277 uschar * message_local_identity,
1278 * current_local_identity,
1279 * new_sender_address;
1280
1281 current_local_identity =
1282 smtp_local_identity(s_compare->current_sender_address, s_compare->tblock);
1283
1284 if (!(new_sender_address = deliver_get_sender_address(message_id)))
1285 return 0;
1286
1287 message_local_identity =
1288 smtp_local_identity(new_sender_address, s_compare->tblock);
1289
1290 return Ustrcmp(current_local_identity, message_local_identity) == 0;
1291 }
1292
1293
1294
1295 static uschar
1296 ehlo_response(uschar * buf, uschar checks)
1297 {
1298 size_t bsize = Ustrlen(buf);
1299
1300 #ifdef SUPPORT_TLS
1301 if ( checks & PEER_OFFERED_TLS
1302 && pcre_exec(regex_STARTTLS, NULL, CS buf, bsize, 0, PCRE_EOPT, NULL, 0) < 0)
1303 checks &= ~PEER_OFFERED_TLS;
1304 #endif
1305
1306 if ( checks & PEER_OFFERED_IGNQ
1307 && pcre_exec(regex_IGNOREQUOTA, NULL, CS buf, bsize, 0,
1308 PCRE_EOPT, NULL, 0) < 0)
1309 checks &= ~PEER_OFFERED_IGNQ;
1310
1311 if ( checks & PEER_OFFERED_CHUNKING
1312 && pcre_exec(regex_CHUNKING, NULL, CS buf, bsize, 0, PCRE_EOPT, NULL, 0) < 0)
1313 checks &= ~PEER_OFFERED_CHUNKING;
1314
1315 #ifndef DISABLE_PRDR
1316 if ( checks & PEER_OFFERED_PRDR
1317 && pcre_exec(regex_PRDR, NULL, CS buf, bsize, 0, PCRE_EOPT, NULL, 0) < 0)
1318 checks &= ~PEER_OFFERED_PRDR;
1319 #endif
1320
1321 #ifdef SUPPORT_I18N
1322 if ( checks & PEER_OFFERED_UTF8
1323 && pcre_exec(regex_UTF8, NULL, CS buf, bsize, 0, PCRE_EOPT, NULL, 0) < 0)
1324 checks &= ~PEER_OFFERED_UTF8;
1325 #endif
1326
1327 if ( checks & PEER_OFFERED_DSN
1328 && pcre_exec(regex_DSN, NULL, CS buf, bsize, 0, PCRE_EOPT, NULL, 0) < 0)
1329 checks &= ~PEER_OFFERED_DSN;
1330
1331 if ( checks & PEER_OFFERED_PIPE
1332 && pcre_exec(regex_PIPELINING, NULL, CS buf, bsize, 0,
1333 PCRE_EOPT, NULL, 0) < 0)
1334 checks &= ~PEER_OFFERED_PIPE;
1335
1336 if ( checks & PEER_OFFERED_SIZE
1337 && pcre_exec(regex_SIZE, NULL, CS buf, bsize, 0, PCRE_EOPT, NULL, 0) < 0)
1338 checks &= ~PEER_OFFERED_SIZE;
1339
1340 return checks;
1341 }
1342
1343
1344
1345 /* Callback for emitting a BDAT data chunk header.
1346
1347 If given a nonzero size, first flush any buffered SMTP commands
1348 then emit the command.
1349
1350 Reap previous SMTP command responses if requested.
1351 Reap one SMTP command response if requested.
1352
1353 Returns: OK or ERROR
1354 */
1355
1356 static int
1357 smtp_chunk_cmd_callback(int fd, transport_ctx * tctx,
1358 unsigned chunk_size, unsigned flags)
1359 {
1360 smtp_transport_options_block * ob =
1361 (smtp_transport_options_block *)(tctx->tblock->options_block);
1362 smtp_context * sx = tctx->smtp_context;
1363 int cmd_count = 0;
1364 int prev_cmd_count;
1365
1366 /* Write SMTP chunk header command */
1367
1368 if (chunk_size > 0)
1369 {
1370 if((cmd_count = smtp_write_command(&sx->outblock, FALSE, "BDAT %u%s\r\n",
1371 chunk_size,
1372 flags & tc_chunk_last ? " LAST" : "")
1373 ) < 0) return ERROR;
1374 if (flags & tc_chunk_last)
1375 data_command = string_copy(big_buffer); /* Save for later error message */
1376 }
1377
1378 prev_cmd_count = cmd_count += sx->cmd_count;
1379
1380 /* Reap responses for any previous, but not one we just emitted */
1381
1382 if (chunk_size > 0)
1383 prev_cmd_count--;
1384 if (sx->pending_BDAT)
1385 prev_cmd_count--;
1386
1387 if (flags & tc_reap_prev && prev_cmd_count > 0)
1388 {
1389 DEBUG(D_transport) debug_printf("look for %d responses"
1390 " for previous pipelined cmds\n", prev_cmd_count);
1391
1392 switch(sync_responses(sx, prev_cmd_count, 0))
1393 {
1394 case 1: /* 2xx (only) => OK */
1395 case 3: sx->good_RCPT = TRUE; /* 2xx & 5xx => OK & progress made */
1396 case 2: sx->completed_addr = TRUE; /* 5xx (only) => progress made */
1397 case 0: break; /* No 2xx or 5xx, but no probs */
1398
1399 case -1: /* Timeout on RCPT */
1400 default: return ERROR; /* I/O error, or any MAIL/DATA error */
1401 }
1402 cmd_count = 1;
1403 if (!sx->pending_BDAT)
1404 pipelining_active = FALSE;
1405 }
1406
1407 /* Reap response for an outstanding BDAT */
1408
1409 if (sx->pending_BDAT)
1410 {
1411 DEBUG(D_transport) debug_printf("look for one response for BDAT\n");
1412
1413 if (!smtp_read_response(&sx->inblock, sx->buffer, sizeof(sx->buffer), '2',
1414 ob->command_timeout))
1415 {
1416 if (errno == 0 && sx->buffer[0] == '4')
1417 {
1418 errno = ERRNO_DATA4XX; /*XXX does this actually get used? */
1419 sx->addrlist->more_errno |=
1420 ((sx->buffer[1] - '0')*10 + sx->buffer[2] - '0') << 8;
1421 }
1422 return ERROR;
1423 }
1424 cmd_count--;
1425 sx->pending_BDAT = FALSE;
1426 pipelining_active = FALSE;
1427 }
1428 else if (chunk_size > 0)
1429 sx->pending_BDAT = TRUE;
1430
1431
1432 sx->cmd_count = cmd_count;
1433 return OK;
1434 }
1435
1436
1437
1438 /*************************************************
1439 * Make connection for given message *
1440 *************************************************/
1441
1442 /*
1443 Arguments:
1444 ctx connection context
1445 suppress_tls if TRUE, don't attempt a TLS connection - this is set for
1446 a second attempt after TLS initialization fails
1447
1448 Returns: OK - the connection was made and the delivery attempted;
1449 fd is set in the conn context, tls_out set up.
1450 DEFER - the connection could not be made, or something failed
1451 while setting up the SMTP session, or there was a
1452 non-message-specific error, such as a timeout.
1453 ERROR - helo_data or add_headers or authenticated_sender is
1454 specified for this transport, and the string failed
1455 to expand
1456 */
1457 int
1458 smtp_setup_conn(smtp_context * sx, BOOL suppress_tls)
1459 {
1460 #if defined(SUPPORT_TLS) && defined(EXPERIMENTAL_DANE)
1461 dns_answer tlsa_dnsa;
1462 #endif
1463 BOOL pass_message = FALSE;
1464 uschar * message = NULL;
1465 int yield = OK;
1466 int rc;
1467
1468 sx->ob = (smtp_transport_options_block *) sx->tblock->options_block;
1469
1470 sx->lmtp = strcmpic(sx->ob->protocol, US"lmtp") == 0;
1471 sx->smtps = strcmpic(sx->ob->protocol, US"smtps") == 0;
1472 sx->ok = FALSE;
1473 sx->send_rset = TRUE;
1474 sx->send_quit = TRUE;
1475 sx->setting_up = TRUE;
1476 sx->esmtp = TRUE;
1477 sx->esmtp_sent = FALSE;
1478 #ifdef SUPPORT_I18N
1479 sx->utf8_needed = FALSE;
1480 #endif
1481 sx->dsn_all_lasthop = TRUE;
1482 #if defined(SUPPORT_TLS) && defined(EXPERIMENTAL_DANE)
1483 sx->dane = FALSE;
1484 sx->dane_required = verify_check_given_host(&sx->ob->hosts_require_dane, sx->host) == OK;
1485 #endif
1486
1487 if ((sx->max_rcpt = sx->tblock->max_addresses) == 0) sx->max_rcpt = 999999;
1488 sx->peer_offered = 0;
1489 sx->igquotstr = US"";
1490 if (!sx->helo_data) sx->helo_data = sx->ob->helo_data;
1491 #ifdef EXPERIMENTAL_DSN_INFO
1492 sx->smtp_greeting = NULL;
1493 sx->helo_response = NULL;
1494 #endif
1495
1496 smtp_command = US"initial connection";
1497 sx->buffer[0] = '\0';
1498
1499 /* Set up the buffer for reading SMTP response packets. */
1500
1501 sx->inblock.buffer = sx->inbuffer;
1502 sx->inblock.buffersize = sizeof(sx->inbuffer);
1503 sx->inblock.ptr = sx->inbuffer;
1504 sx->inblock.ptrend = sx->inbuffer;
1505
1506 /* Set up the buffer for holding SMTP commands while pipelining */
1507
1508 sx->outblock.buffer = sx->outbuffer;
1509 sx->outblock.buffersize = sizeof(sx->outbuffer);
1510 sx->outblock.ptr = sx->outbuffer;
1511 sx->outblock.cmd_count = 0;
1512 sx->outblock.authenticating = FALSE;
1513
1514 /* Reset the parameters of a TLS session. */
1515
1516 tls_out.bits = 0;
1517 tls_out.cipher = NULL; /* the one we may use for this transport */
1518 tls_out.ourcert = NULL;
1519 tls_out.peercert = NULL;
1520 tls_out.peerdn = NULL;
1521 #if defined(SUPPORT_TLS) && !defined(USE_GNUTLS)
1522 tls_out.sni = NULL;
1523 #endif
1524 tls_out.ocsp = OCSP_NOT_REQ;
1525
1526 /* Flip the legacy TLS-related variables over to the outbound set in case
1527 they're used in the context of the transport. Don't bother resetting
1528 afterward (when being used by a transport) as we're in a subprocess.
1529 For verify, unflipped once the callout is dealt with */
1530
1531 tls_modify_variables(&tls_out);
1532
1533 #ifndef SUPPORT_TLS
1534 if (sx->smtps)
1535 {
1536 set_errno_nohost(sx->addrlist, ERRNO_TLSFAILURE, US"TLS support not available",
1537 DEFER, FALSE);
1538 return ERROR;
1539 }
1540 #endif
1541
1542 /* Make a connection to the host if this isn't a continued delivery, and handle
1543 the initial interaction and HELO/EHLO/LHLO. Connect timeout errors are handled
1544 specially so they can be identified for retries. */
1545
1546 if (continue_hostname == NULL)
1547 {
1548 if (sx->verify)
1549 HDEBUG(D_verify) debug_printf("interface=%s port=%d\n", sx->interface, sx->port);
1550
1551 /* This puts port into host->port */
1552 sx->inblock.sock = sx->outblock.sock =
1553 smtp_connect(sx->host, sx->host_af, sx->port, sx->interface,
1554 sx->ob->connect_timeout, sx->tblock);
1555
1556 if (sx->inblock.sock < 0)
1557 {
1558 uschar * msg = NULL;
1559 if (sx->verify)
1560 {
1561 msg = US strerror(errno);
1562 HDEBUG(D_verify) debug_printf("connect: %s\n", msg);
1563 }
1564 set_errno_nohost(sx->addrlist,
1565 errno == ETIMEDOUT ? ERRNO_CONNECTTIMEOUT : errno,
1566 sx->verify ? string_sprintf("could not connect: %s", msg)
1567 : NULL,
1568 DEFER, FALSE);
1569 sx->send_quit = FALSE;
1570 return DEFER;
1571 }
1572
1573 #if defined(SUPPORT_TLS) && defined(EXPERIMENTAL_DANE)
1574 {
1575 tls_out.dane_verified = FALSE;
1576 tls_out.tlsa_usage = 0;
1577
1578 if (sx->host->dnssec == DS_YES)
1579 {
1580 if( sx->dane_required
1581 || verify_check_given_host(&sx->ob->hosts_try_dane, sx->host) == OK
1582 )
1583 switch (rc = tlsa_lookup(sx->host, &tlsa_dnsa, sx->dane_required))
1584 {
1585 case OK: sx->dane = TRUE; break;
1586 case FAIL_FORCED: break;
1587 default: set_errno_nohost(sx->addrlist, ERRNO_DNSDEFER,
1588 string_sprintf("DANE error: tlsa lookup %s",
1589 rc == DEFER ? "DEFER" : "FAIL"),
1590 rc, FALSE);
1591 return rc;
1592 }
1593 }
1594 else if (sx->dane_required)
1595 {
1596 set_errno_nohost(sx->addrlist, ERRNO_DNSDEFER,
1597 string_sprintf("DANE error: %s lookup not DNSSEC", sx->host->name),
1598 FAIL, FALSE);
1599 return FAIL;
1600 }
1601
1602 if (sx->dane)
1603 sx->ob->tls_tempfail_tryclear = FALSE;
1604 }
1605 #endif /*DANE*/
1606
1607 /* Expand the greeting message while waiting for the initial response. (Makes
1608 sense if helo_data contains ${lookup dnsdb ...} stuff). The expansion is
1609 delayed till here so that $sending_interface and $sending_port are set. */
1610
1611 if (sx->helo_data)
1612 if (!(sx->helo_data = expand_string(sx->helo_data)))
1613 if (sx->verify)
1614 log_write(0, LOG_MAIN|LOG_PANIC,
1615 "<%s>: failed to expand transport's helo_data value for callout: %s",
1616 sx->addrlist->address, expand_string_message);
1617
1618 #ifdef SUPPORT_I18N
1619 if (sx->helo_data)
1620 {
1621 expand_string_message = NULL;
1622 if ((sx->helo_data = string_domain_utf8_to_alabel(sx->helo_data,
1623 &expand_string_message)),
1624 expand_string_message)
1625 if (sx->verify)
1626 log_write(0, LOG_MAIN|LOG_PANIC,
1627 "<%s>: failed to expand transport's helo_data value for callout: %s",
1628 sx->addrlist->address, expand_string_message);
1629 else
1630 sx->helo_data = NULL;
1631 }
1632 #endif
1633
1634 /* The first thing is to wait for an initial OK response. The dreaded "goto"
1635 is nevertheless a reasonably clean way of programming this kind of logic,
1636 where you want to escape on any error. */
1637
1638 if (!sx->smtps)
1639 {
1640 BOOL good_response;
1641
1642 #ifdef TCP_QUICKACK
1643 (void) setsockopt(sx->inblock.sock, IPPROTO_TCP, TCP_QUICKACK, US &off, sizeof(off));
1644 #endif
1645 good_response = smtp_read_response(&sx->inblock, sx->buffer, sizeof(sx->buffer),
1646 '2', sx->ob->command_timeout);
1647 #ifdef EXPERIMENTAL_DSN_INFO
1648 sx->smtp_greeting = string_copy(sx->buffer);
1649 #endif
1650 if (!good_response) goto RESPONSE_FAILED;
1651
1652 #ifndef DISABLE_EVENT
1653 {
1654 uschar * s;
1655 lookup_dnssec_authenticated = sx->host->dnssec==DS_YES ? US"yes"
1656 : sx->host->dnssec==DS_NO ? US"no" : NULL;
1657 s = event_raise(sx->tblock->event_action, US"smtp:connect", sx->buffer);
1658 if (s)
1659 {
1660 set_errno_nohost(sx->addrlist, ERRNO_EXPANDFAIL,
1661 string_sprintf("deferred by smtp:connect event expansion: %s", s),
1662 DEFER, FALSE);
1663 yield = DEFER;
1664 goto SEND_QUIT;
1665 }
1666 }
1667 #endif
1668
1669 /* Now check if the helo_data expansion went well, and sign off cleanly if
1670 it didn't. */
1671
1672 if (!sx->helo_data)
1673 {
1674 message = string_sprintf("failed to expand helo_data: %s",
1675 expand_string_message);
1676 set_errno_nohost(sx->addrlist, ERRNO_EXPANDFAIL, message, DEFER, FALSE);
1677 yield = DEFER;
1678 goto SEND_QUIT;
1679 }
1680 }
1681
1682 /** Debugging without sending a message
1683 sx->addrlist->transport_return = DEFER;
1684 goto SEND_QUIT;
1685 **/
1686
1687 /* Errors that occur after this point follow an SMTP command, which is
1688 left in big_buffer by smtp_write_command() for use in error messages. */
1689
1690 smtp_command = big_buffer;
1691
1692 /* Tell the remote who we are...
1693
1694 February 1998: A convention has evolved that ESMTP-speaking MTAs include the
1695 string "ESMTP" in their greeting lines, so make Exim send EHLO if the
1696 greeting is of this form. The assumption was that the far end supports it
1697 properly... but experience shows that there are some that give 5xx responses,
1698 even though the banner includes "ESMTP" (there's a bloody-minded one that
1699 says "ESMTP not spoken here"). Cope with that case.
1700
1701 September 2000: Time has passed, and it seems reasonable now to always send
1702 EHLO at the start. It is also convenient to make the change while installing
1703 the TLS stuff.
1704
1705 July 2003: Joachim Wieland met a broken server that advertises "PIPELINING"
1706 but times out after sending MAIL FROM, RCPT TO and DATA all together. There
1707 would be no way to send out the mails, so there is now a host list
1708 "hosts_avoid_esmtp" that disables ESMTP for special hosts and solves the
1709 PIPELINING problem as well. Maybe it can also be useful to cure other
1710 problems with broken servers.
1711
1712 Exim originally sent "Helo" at this point and ran for nearly a year that way.
1713 Then somebody tried it with a Microsoft mailer... It seems that all other
1714 mailers use upper case for some reason (the RFC is quite clear about case
1715 independence) so, for peace of mind, I gave in. */
1716
1717 sx->esmtp = verify_check_given_host(&sx->ob->hosts_avoid_esmtp, sx->host) != OK;
1718
1719 /* Alas; be careful, since this goto is not an error-out, so conceivably
1720 we might set data between here and the target which we assume to exist
1721 and be usable. I can see this coming back to bite us. */
1722 #ifdef SUPPORT_TLS
1723 if (sx->smtps)
1724 {
1725 smtp_peer_options |= PEER_OFFERED_TLS;
1726 suppress_tls = FALSE;
1727 sx->ob->tls_tempfail_tryclear = FALSE;
1728 smtp_command = US"SSL-on-connect";
1729 goto TLS_NEGOTIATE;
1730 }
1731 #endif
1732
1733 if (sx->esmtp)
1734 {
1735 if (smtp_write_command(&sx->outblock, FALSE, "%s %s\r\n",
1736 sx->lmtp ? "LHLO" : "EHLO", sx->helo_data) < 0)
1737 goto SEND_FAILED;
1738 sx->esmtp_sent = TRUE;
1739 if (!smtp_read_response(&sx->inblock, sx->buffer, sizeof(sx->buffer), '2',
1740 sx->ob->command_timeout))
1741 {
1742 if (errno != 0 || sx->buffer[0] == 0 || sx->lmtp)
1743 {
1744 #ifdef EXPERIMENTAL_DSN_INFO
1745 sx->helo_response = string_copy(sx->buffer);
1746 #endif
1747 goto RESPONSE_FAILED;
1748 }
1749 sx->esmtp = FALSE;
1750 }
1751 #ifdef EXPERIMENTAL_DSN_INFO
1752 sx->helo_response = string_copy(sx->buffer);
1753 #endif
1754 }
1755 else
1756 DEBUG(D_transport)
1757 debug_printf("not sending EHLO (host matches hosts_avoid_esmtp)\n");
1758
1759 if (!sx->esmtp)
1760 {
1761 BOOL good_response;
1762 int n = sizeof(sx->buffer);
1763 uschar * rsp = sx->buffer;
1764
1765 if (sx->esmtp_sent && (n = Ustrlen(sx->buffer)) < sizeof(sx->buffer)/2)
1766 { rsp = sx->buffer + n + 1; n = sizeof(sx->buffer) - n; }
1767
1768 if (smtp_write_command(&sx->outblock, FALSE, "HELO %s\r\n", sx->helo_data) < 0)
1769 goto SEND_FAILED;
1770 good_response = smtp_read_response(&sx->inblock, rsp, n,
1771 '2', sx->ob->command_timeout);
1772 #ifdef EXPERIMENTAL_DSN_INFO
1773 sx->helo_response = string_copy(rsp);
1774 #endif
1775 if (!good_response)
1776 {
1777 /* Handle special logging for a closed connection after HELO
1778 when had previously sent EHLO */
1779
1780 if (rsp != sx->buffer && rsp[0] == 0 && (errno == 0 || errno == ECONNRESET))
1781 {
1782 errno = ERRNO_SMTPCLOSED;
1783 goto EHLOHELO_FAILED;
1784 }
1785 Ustrncpy(sx->buffer, rsp, sizeof(sx->buffer)/2);
1786 goto RESPONSE_FAILED;
1787 }
1788 }
1789
1790 sx->peer_offered = smtp_peer_options = 0;
1791
1792 if (sx->esmtp || sx->lmtp)
1793 {
1794 sx->peer_offered = ehlo_response(sx->buffer,
1795 PEER_OFFERED_TLS /* others checked later */
1796 );
1797
1798 /* Set tls_offered if the response to EHLO specifies support for STARTTLS. */
1799
1800 #ifdef SUPPORT_TLS
1801 smtp_peer_options |= sx->peer_offered & PEER_OFFERED_TLS;
1802 #endif
1803 }
1804 }
1805
1806 /* For continuing deliveries down the same channel, having re-exec'd the socket
1807 is the standard input; for a socket held open from verify it is recorded
1808 in the cutthrough context block. Either way we don't need to redo EHLO here
1809 (but may need to do so for TLS - see below).
1810 Set up the pointer to where subsequent commands will be left, for
1811 error messages. Note that smtp_peer_options will have been
1812 set from the command line if they were set in the process that passed the
1813 connection on. */
1814
1815 /*XXX continue case needs to propagate DSN_INFO, prob. in deliver.c
1816 as the continue goes via transport_pass_socket() and doublefork and exec.
1817 It does not wait. Unclear how we keep separate host's responses
1818 separate - we could match up by host ip+port as a bodge. */
1819
1820 else
1821 {
1822 if (cutthrough.fd >= 0 && cutthrough.callout_hold_only)
1823 {
1824 sx->inblock.sock = sx->outblock.sock = cutthrough.fd;
1825 sx->host->port = sx->port = cutthrough.host.port;
1826 }
1827 else
1828 {
1829 sx->inblock.sock = sx->outblock.sock = 0; /* stdin */
1830 sx->host->port = sx->port; /* Record the port that was used */
1831 }
1832 smtp_command = big_buffer;
1833 sx->helo_data = NULL; /* ensure we re-expand ob->helo_data */
1834
1835 /* For a continued connection with TLS being proxied for us, or a
1836 held-open verify connection with TLS, nothing more to do. */
1837
1838 if ( continue_proxy_cipher
1839 || (cutthrough.fd >= 0 && cutthrough.callout_hold_only && cutthrough.is_tls)
1840 )
1841 {
1842 sx->peer_offered = smtp_peer_options;
1843 pipelining_active = !!(smtp_peer_options & PEER_OFFERED_PIPE);
1844 HDEBUG(D_transport) debug_printf("continued connection, %s TLS\n",
1845 continue_proxy_cipher ? "proxied" : "verify conn with");
1846 return OK;
1847 }
1848 HDEBUG(D_transport) debug_printf("continued connection, no TLS\n");
1849 }
1850
1851 /* If TLS is available on this connection, whether continued or not, attempt to
1852 start up a TLS session, unless the host is in hosts_avoid_tls. If successful,
1853 send another EHLO - the server may give a different answer in secure mode. We
1854 use a separate buffer for reading the response to STARTTLS so that if it is
1855 negative, the original EHLO data is available for subsequent analysis, should
1856 the client not be required to use TLS. If the response is bad, copy the buffer
1857 for error analysis. */
1858
1859 #ifdef SUPPORT_TLS
1860 if ( smtp_peer_options & PEER_OFFERED_TLS
1861 && !suppress_tls
1862 && verify_check_given_host(&sx->ob->hosts_avoid_tls, sx->host) != OK
1863 && ( !sx->verify
1864 || verify_check_given_host(&sx->ob->hosts_verify_avoid_tls, sx->host) != OK
1865 ) )
1866 {
1867 uschar buffer2[4096];
1868 if (smtp_write_command(&sx->outblock, FALSE, "STARTTLS\r\n") < 0)
1869 goto SEND_FAILED;
1870
1871 /* If there is an I/O error, transmission of this message is deferred. If
1872 there is a temporary rejection of STARRTLS and tls_tempfail_tryclear is
1873 false, we also defer. However, if there is a temporary rejection of STARTTLS
1874 and tls_tempfail_tryclear is true, or if there is an outright rejection of
1875 STARTTLS, we carry on. This means we will try to send the message in clear,
1876 unless the host is in hosts_require_tls (tested below). */
1877
1878 if (!smtp_read_response(&sx->inblock, buffer2, sizeof(buffer2), '2',
1879 sx->ob->command_timeout))
1880 {
1881 if ( errno != 0
1882 || buffer2[0] == 0
1883 || (buffer2[0] == '4' && !sx->ob->tls_tempfail_tryclear)
1884 )
1885 {
1886 Ustrncpy(sx->buffer, buffer2, sizeof(sx->buffer));
1887 sx->buffer[sizeof(sx->buffer)-1] = '\0';
1888 goto RESPONSE_FAILED;
1889 }
1890 }
1891
1892 /* STARTTLS accepted: try to negotiate a TLS session. */
1893
1894 else
1895 TLS_NEGOTIATE:
1896 {
1897 address_item * addr;
1898 uschar * errstr;
1899 int rc = tls_client_start(sx->inblock.sock, sx->host, sx->addrlist, sx->tblock,
1900 # ifdef EXPERIMENTAL_DANE
1901 sx->dane ? &tlsa_dnsa : NULL,
1902 # endif
1903 &errstr);
1904
1905 /* TLS negotiation failed; give an error. From outside, this function may
1906 be called again to try in clear on a new connection, if the options permit
1907 it for this host. */
1908
1909 if (rc != OK)
1910 {
1911 # ifdef EXPERIMENTAL_DANE
1912 if (sx->dane) log_write(0, LOG_MAIN,
1913 "DANE attempt failed; TLS connection to %s [%s]: %s",
1914 sx->host->name, sx->host->address, errstr);
1915 # endif
1916
1917 errno = ERRNO_TLSFAILURE;
1918 message = string_sprintf("TLS session: %s", errstr);
1919 sx->send_quit = FALSE;
1920 goto TLS_FAILED;
1921 }
1922
1923 /* TLS session is set up */
1924
1925 smtp_peer_options_wrap = smtp_peer_options;
1926 for (addr = sx->addrlist; addr; addr = addr->next)
1927 if (addr->transport_return == PENDING_DEFER)
1928 {
1929 addr->cipher = tls_out.cipher;
1930 addr->ourcert = tls_out.ourcert;
1931 addr->peercert = tls_out.peercert;
1932 addr->peerdn = tls_out.peerdn;
1933 addr->ocsp = tls_out.ocsp;
1934 }
1935 }
1936 }
1937
1938 /* if smtps, we'll have smtp_command set to something else; always safe to
1939 reset it here. */
1940 smtp_command = big_buffer;
1941
1942 /* If we started TLS, redo the EHLO/LHLO exchange over the secure channel. If
1943 helo_data is null, we are dealing with a connection that was passed from
1944 another process, and so we won't have expanded helo_data above. We have to
1945 expand it here. $sending_ip_address and $sending_port are set up right at the
1946 start of the Exim process (in exim.c). */
1947
1948 if (tls_out.active >= 0)
1949 {
1950 char *greeting_cmd;
1951 BOOL good_response;
1952
1953 if (!sx->helo_data && !(sx->helo_data = expand_string(sx->ob->helo_data)))
1954 {
1955 uschar *message = string_sprintf("failed to expand helo_data: %s",
1956 expand_string_message);
1957 set_errno_nohost(sx->addrlist, ERRNO_EXPANDFAIL, message, DEFER, FALSE);
1958 yield = DEFER;
1959 goto SEND_QUIT;
1960 }
1961
1962 /* For SMTPS we need to wait for the initial OK response. */
1963 if (sx->smtps)
1964 {
1965 good_response = smtp_read_response(&sx->inblock, sx->buffer, sizeof(sx->buffer),
1966 '2', sx->ob->command_timeout);
1967 #ifdef EXPERIMENTAL_DSN_INFO
1968 sx->smtp_greeting = string_copy(sx->buffer);
1969 #endif
1970 if (!good_response) goto RESPONSE_FAILED;
1971 }
1972
1973 if (sx->esmtp)
1974 greeting_cmd = "EHLO";
1975 else
1976 {
1977 greeting_cmd = "HELO";
1978 DEBUG(D_transport)
1979 debug_printf("not sending EHLO (host matches hosts_avoid_esmtp)\n");
1980 }
1981
1982 if (smtp_write_command(&sx->outblock, FALSE, "%s %s\r\n",
1983 sx->lmtp ? "LHLO" : greeting_cmd, sx->helo_data) < 0)
1984 goto SEND_FAILED;
1985 good_response = smtp_read_response(&sx->inblock, sx->buffer, sizeof(sx->buffer),
1986 '2', sx->ob->command_timeout);
1987 #ifdef EXPERIMENTAL_DSN_INFO
1988 sx->helo_response = string_copy(sx->buffer);
1989 #endif
1990 if (!good_response) goto RESPONSE_FAILED;
1991 smtp_peer_options = 0;
1992 }
1993
1994 /* If the host is required to use a secure channel, ensure that we
1995 have one. */
1996
1997 else if ( sx->smtps
1998 # ifdef EXPERIMENTAL_DANE
1999 || sx->dane
2000 # endif
2001 || verify_check_given_host(&sx->ob->hosts_require_tls, sx->host) == OK
2002 )
2003 {
2004 errno = ERRNO_TLSREQUIRED;
2005 message = string_sprintf("a TLS session is required, but %s",
2006 smtp_peer_options & PEER_OFFERED_TLS
2007 ? "an attempt to start TLS failed" : "the server did not offer TLS support");
2008 goto TLS_FAILED;
2009 }
2010 #endif /*SUPPORT_TLS*/
2011
2012 /* If TLS is active, we have just started it up and re-done the EHLO command,
2013 so its response needs to be analyzed. If TLS is not active and this is a
2014 continued session down a previously-used socket, we haven't just done EHLO, so
2015 we skip this. */
2016
2017 if (continue_hostname == NULL
2018 #ifdef SUPPORT_TLS
2019 || tls_out.active >= 0
2020 #endif
2021 )
2022 {
2023 if (sx->esmtp || sx->lmtp)
2024 {
2025 sx->peer_offered = ehlo_response(sx->buffer,
2026 0 /* no TLS */
2027 | (sx->lmtp && sx->ob->lmtp_ignore_quota ? PEER_OFFERED_IGNQ : 0)
2028 | PEER_OFFERED_CHUNKING
2029 | PEER_OFFERED_PRDR
2030 #ifdef SUPPORT_I18N
2031 | (sx->addrlist->prop.utf8_msg ? PEER_OFFERED_UTF8 : 0)
2032 /*XXX if we hand peercaps on to continued-conn processes,
2033 must not depend on this addr */
2034 #endif
2035 | PEER_OFFERED_DSN
2036 | PEER_OFFERED_PIPE
2037 | (sx->ob->size_addition >= 0 ? PEER_OFFERED_SIZE : 0)
2038 );
2039
2040 /* Set for IGNOREQUOTA if the response to LHLO specifies support and the
2041 lmtp_ignore_quota option was set. */
2042
2043 sx->igquotstr = sx->peer_offered & PEER_OFFERED_IGNQ ? US" IGNOREQUOTA" : US"";
2044
2045 /* If the response to EHLO specified support for the SIZE parameter, note
2046 this, provided size_addition is non-negative. */
2047
2048 smtp_peer_options |= sx->peer_offered & PEER_OFFERED_SIZE;
2049
2050 /* Note whether the server supports PIPELINING. If hosts_avoid_esmtp matched
2051 the current host, esmtp will be false, so PIPELINING can never be used. If
2052 the current host matches hosts_avoid_pipelining, don't do it. */
2053
2054 if ( sx->peer_offered & PEER_OFFERED_PIPE
2055 && verify_check_given_host(&sx->ob->hosts_avoid_pipelining, sx->host) != OK)
2056 smtp_peer_options |= PEER_OFFERED_PIPE;
2057
2058 DEBUG(D_transport) debug_printf("%susing PIPELINING\n",
2059 smtp_peer_options & PEER_OFFERED_PIPE ? "" : "not ");
2060
2061 if ( sx->peer_offered & PEER_OFFERED_CHUNKING
2062 && verify_check_given_host(&sx->ob->hosts_try_chunking, sx->host) != OK)
2063 sx->peer_offered &= ~PEER_OFFERED_CHUNKING;
2064
2065 if (sx->peer_offered & PEER_OFFERED_CHUNKING)
2066 {DEBUG(D_transport) debug_printf("CHUNKING usable\n");}
2067
2068 #ifndef DISABLE_PRDR
2069 if ( sx->peer_offered & PEER_OFFERED_PRDR
2070 && verify_check_given_host(&sx->ob->hosts_try_prdr, sx->host) != OK)
2071 sx->peer_offered &= ~PEER_OFFERED_PRDR;
2072
2073 if (sx->peer_offered & PEER_OFFERED_PRDR)
2074 {DEBUG(D_transport) debug_printf("PRDR usable\n");}
2075 #endif
2076
2077 /* Note if the server supports DSN */
2078 smtp_peer_options |= sx->peer_offered & PEER_OFFERED_DSN;
2079 DEBUG(D_transport) debug_printf("%susing DSN\n",
2080 sx->peer_offered & PEER_OFFERED_DSN ? "" : "not ");
2081
2082 /* Note if the response to EHLO specifies support for the AUTH extension.
2083 If it has, check that this host is one we want to authenticate to, and do
2084 the business. The host name and address must be available when the
2085 authenticator's client driver is running. */
2086
2087 switch (yield = smtp_auth(sx->buffer, sizeof(sx->buffer), sx->addrlist, sx->host,
2088 sx->ob, sx->esmtp, &sx->inblock, &sx->outblock))
2089 {
2090 default: goto SEND_QUIT;
2091 case OK: break;
2092 case FAIL_SEND: goto SEND_FAILED;
2093 case FAIL: goto RESPONSE_FAILED;
2094 }
2095 }
2096 }
2097 pipelining_active = !!(smtp_peer_options & PEER_OFFERED_PIPE);
2098
2099 /* The setting up of the SMTP call is now complete. Any subsequent errors are
2100 message-specific. */
2101
2102 sx->setting_up = FALSE;
2103
2104 #ifdef SUPPORT_I18N
2105 if (sx->addrlist->prop.utf8_msg)
2106 {
2107 sx->utf8_needed = !sx->addrlist->prop.utf8_downcvt
2108 && !sx->addrlist->prop.utf8_downcvt_maybe;
2109 DEBUG(D_transport) if (!sx->utf8_needed)
2110 debug_printf("utf8: %s downconvert\n",
2111 sx->addrlist->prop.utf8_downcvt ? "mandatory" : "optional");
2112 }
2113
2114 /* If this is an international message we need the host to speak SMTPUTF8 */
2115 if (sx->utf8_needed && !(sx->peer_offered & PEER_OFFERED_UTF8))
2116 {
2117 errno = ERRNO_UTF8_FWD;
2118 goto RESPONSE_FAILED;
2119 }
2120 #endif
2121
2122 return OK;
2123
2124
2125 {
2126 int code;
2127
2128 RESPONSE_FAILED:
2129 message = NULL;
2130 sx->send_quit = check_response(sx->host, &errno, sx->addrlist->more_errno,
2131 sx->buffer, &code, &message, &pass_message);
2132 goto FAILED;
2133
2134 SEND_FAILED:
2135 code = '4';
2136 message = US string_sprintf("send() to %s [%s] failed: %s",
2137 sx->host->name, sx->host->address, strerror(errno));
2138 sx->send_quit = FALSE;
2139 goto FAILED;
2140
2141 /* This label is jumped to directly when a TLS negotiation has failed,
2142 or was not done for a host for which it is required. Values will be set
2143 in message and errno, and setting_up will always be true. Treat as
2144 a temporary error. */
2145
2146 EHLOHELO_FAILED:
2147 code = '4';
2148 message = string_sprintf("Remote host closed connection in response to %s"
2149 " (EHLO response was: %s)", smtp_command, sx->buffer);
2150 sx->send_quit = FALSE;
2151 goto FAILED;
2152
2153 #ifdef SUPPORT_TLS
2154 TLS_FAILED:
2155 code = '4';
2156 goto FAILED;
2157 #endif
2158
2159 /* The failure happened while setting up the call; see if the failure was
2160 a 5xx response (this will either be on connection, or following HELO - a 5xx
2161 after EHLO causes it to try HELO). If so, fail all addresses, as this host is
2162 never going to accept them. For other errors during setting up (timeouts or
2163 whatever), defer all addresses, and yield DEFER, so that the host is not
2164 tried again for a while. */
2165
2166 FAILED:
2167 sx->ok = FALSE; /* For when reached by GOTO */
2168
2169 yield = code == '5'
2170 #ifdef SUPPORT_I18N
2171 || errno == ERRNO_UTF8_FWD
2172 #endif
2173 ? FAIL : DEFER;
2174
2175 set_errno(sx->addrlist, errno, message, yield, pass_message, sx->host
2176 #ifdef EXPERIMENTAL_DSN_INFO
2177 , sx->smtp_greeting, sx->helo_response
2178 #endif
2179 );
2180 }
2181
2182
2183 SEND_QUIT:
2184
2185 if (sx->send_quit)
2186 (void)smtp_write_command(&sx->outblock, FALSE, "QUIT\r\n");
2187
2188 #ifdef SUPPORT_TLS
2189 tls_close(FALSE, TRUE);
2190 #endif
2191
2192 /* Close the socket, and return the appropriate value, first setting
2193 works because the NULL setting is passed back to the calling process, and
2194 remote_max_parallel is forced to 1 when delivering over an existing connection,
2195
2196 If all went well and continue_more is set, we shouldn't actually get here if
2197 there are further addresses, as the return above will be taken. However,
2198 writing RSET might have failed, or there may be other addresses whose hosts are
2199 specified in the transports, and therefore not visible at top level, in which
2200 case continue_more won't get set. */
2201
2202 HDEBUG(D_transport|D_acl|D_v) debug_printf_indent(" SMTP(close)>>\n");
2203 if (sx->send_quit)
2204 {
2205 shutdown(sx->outblock.sock, SHUT_WR);
2206 if (fcntl(sx->inblock.sock, F_SETFL, O_NONBLOCK) == 0)
2207 for (rc = 16; read(sx->inblock.sock, sx->inbuffer, sizeof(sx->inbuffer)) > 0 && rc > 0;)
2208 rc--; /* drain socket */
2209 sx->send_quit = FALSE;
2210 }
2211 (void)close(sx->inblock.sock);
2212 sx->inblock.sock = sx->outblock.sock = -1;
2213
2214 #ifndef DISABLE_EVENT
2215 (void) event_raise(sx->tblock->event_action, US"tcp:close", NULL);
2216 #endif
2217
2218 continue_transport = NULL;
2219 continue_hostname = NULL;
2220 return yield;
2221 }
2222
2223
2224
2225
2226 /* Create the string of options that will be appended to the MAIL FROM:
2227 in the connection context buffer */
2228
2229 static int
2230 build_mailcmd_options(smtp_context * sx, address_item * addrlist)
2231 {
2232 uschar * p = sx->buffer;
2233 address_item * addr;
2234 int address_count;
2235
2236 *p = 0;
2237
2238 /* If we know the receiving MTA supports the SIZE qualification,
2239 send it, adding something to the message size to allow for imprecision
2240 and things that get added en route. Exim keeps the number of lines
2241 in a message, so we can give an accurate value for the original message, but we
2242 need some additional to handle added headers. (Double "." characters don't get
2243 included in the count.) */
2244
2245 if (sx->peer_offered & PEER_OFFERED_SIZE)
2246 {
2247 sprintf(CS p, " SIZE=%d", message_size+message_linecount+sx->ob->size_addition);
2248 while (*p) p++;
2249 }
2250
2251 #ifndef DISABLE_PRDR
2252 /* If it supports Per-Recipient Data Reponses, and we have omre than one recipient,
2253 request that */
2254
2255 sx->prdr_active = FALSE;
2256 if (sx->peer_offered & PEER_OFFERED_PRDR)
2257 for (addr = addrlist; addr; addr = addr->next)
2258 if (addr->transport_return == PENDING_DEFER)
2259 {
2260 for (addr = addr->next; addr; addr = addr->next)
2261 if (addr->transport_return == PENDING_DEFER)
2262 { /* at least two recipients to send */
2263 sx->prdr_active = TRUE;
2264 sprintf(CS p, " PRDR"); p += 5;
2265 break;
2266 }
2267 break;
2268 }
2269 #endif
2270
2271 #ifdef SUPPORT_I18N
2272 /* If it supports internationalised messages, and this meesage need that,
2273 request it */
2274
2275 if ( sx->peer_offered & PEER_OFFERED_UTF8
2276 && addrlist->prop.utf8_msg
2277 && !addrlist->prop.utf8_downcvt
2278 )
2279 Ustrcpy(p, " SMTPUTF8"), p += 9;
2280 #endif
2281
2282 /* check if all addresses have DSN-lasthop flag; do not send RET and ENVID if so */
2283 for (sx->dsn_all_lasthop = TRUE, addr = addrlist, address_count = 0;
2284 addr && address_count < sx->max_rcpt;
2285 addr = addr->next) if (addr->transport_return == PENDING_DEFER)
2286 {
2287 address_count++;
2288 if (!(addr->dsn_flags & rf_dsnlasthop))
2289 {
2290 sx->dsn_all_lasthop = FALSE;
2291 break;
2292 }
2293 }
2294
2295 /* Add any DSN flags to the mail command */
2296
2297 if (sx->peer_offered & PEER_OFFERED_DSN && !sx->dsn_all_lasthop)
2298 {
2299 if (dsn_ret == dsn_ret_hdrs)
2300 { Ustrcpy(p, " RET=HDRS"); p += 9; }
2301 else if (dsn_ret == dsn_ret_full)
2302 { Ustrcpy(p, " RET=FULL"); p += 9; }
2303
2304 if (dsn_envid)
2305 {
2306 string_format(p, sizeof(sx->buffer) - (p-sx->buffer), " ENVID=%s", dsn_envid);
2307 while (*p) p++;
2308 }
2309 }
2310
2311 /* If an authenticated_sender override has been specified for this transport
2312 instance, expand it. If the expansion is forced to fail, and there was already
2313 an authenticated_sender for this message, the original value will be used.
2314 Other expansion failures are serious. An empty result is ignored, but there is
2315 otherwise no check - this feature is expected to be used with LMTP and other
2316 cases where non-standard addresses (e.g. without domains) might be required. */
2317
2318 if (smtp_mail_auth_str(p, sizeof(sx->buffer) - (p-sx->buffer), addrlist, sx->ob))
2319 return ERROR;
2320
2321 return OK;
2322 }
2323
2324
2325 static void
2326 build_rcptcmd_options(smtp_context * sx, const address_item * addr)
2327 {
2328 uschar * p = sx->buffer;
2329 *p = 0;
2330
2331 /* Add any DSN flags to the rcpt command */
2332
2333 if (sx->peer_offered & PEER_OFFERED_DSN && !(addr->dsn_flags & rf_dsnlasthop))
2334 {
2335 if (addr->dsn_flags & rf_dsnflags)
2336 {
2337 int i;
2338 BOOL first = TRUE;
2339
2340 Ustrcpy(p, " NOTIFY=");
2341 while (*p) p++;
2342 for (i = 0; i < nelem(rf_list); i++) if (addr->dsn_flags & rf_list[i])
2343 {
2344 if (!first) *p++ = ',';
2345 first = FALSE;
2346 Ustrcpy(p, rf_names[i]);
2347 while (*p) p++;
2348 }
2349 }
2350
2351 if (addr->dsn_orcpt)
2352 {
2353 string_format(p, sizeof(sx->buffer) - (p-sx->buffer), " ORCPT=%s",
2354 addr->dsn_orcpt);
2355 while (*p) p++;
2356 }
2357 }
2358 }
2359
2360
2361
2362 /*
2363 Return:
2364 0 good, rcpt results in addr->transport_return (PENDING_OK, DEFER, FAIL)
2365 -1 MAIL response error
2366 -2 any non-MAIL read i/o error
2367 -3 non-MAIL response timeout
2368 -4 internal error; channel still usable
2369 -5 transmit failed
2370 */
2371
2372 int
2373 smtp_write_mail_and_rcpt_cmds(smtp_context * sx, int * yield)
2374 {
2375 address_item * addr;
2376 int address_count;
2377 int rc;
2378
2379 if (build_mailcmd_options(sx, sx->first_addr) != OK)
2380 {
2381 *yield = ERROR;
2382 return -4;
2383 }
2384
2385 /* From here until we send the DATA command, we can make use of PIPELINING
2386 if the server host supports it. The code has to be able to check the responses
2387 at any point, for when the buffer fills up, so we write it totally generally.
2388 When PIPELINING is off, each command written reports that it has flushed the
2389 buffer. */
2390
2391 sx->pending_MAIL = TRUE; /* The block starts with MAIL */
2392
2393 {
2394 uschar * s = sx->from_addr;
2395 #ifdef SUPPORT_I18N
2396 uschar * errstr = NULL;
2397
2398 /* If we must downconvert, do the from-address here. Remember we had to
2399 for the to-addresses (done below), and also (ugly) for re-doing when building
2400 the delivery log line. */
2401
2402 if ( sx->addrlist->prop.utf8_msg
2403 && (sx->addrlist->prop.utf8_downcvt || !(sx->peer_offered & PEER_OFFERED_UTF8))
2404 )
2405 {
2406 if (s = string_address_utf8_to_alabel(s, &errstr), errstr)
2407 {
2408 set_errno_nohost(sx->addrlist, ERRNO_EXPANDFAIL, errstr, DEFER, FALSE);
2409 *yield = ERROR;
2410 return -4;
2411 }
2412 setflag(sx->addrlist, af_utf8_downcvt);
2413 }
2414 #endif
2415
2416 rc = smtp_write_command(&sx->outblock, pipelining_active,
2417 "MAIL FROM:<%s>%s\r\n", s, sx->buffer);
2418 }
2419
2420 mail_command = string_copy(big_buffer); /* Save for later error message */
2421
2422 switch(rc)
2423 {
2424 case -1: /* Transmission error */
2425 return -5;
2426
2427 case +1: /* Cmd was sent */
2428 if (!smtp_read_response(&sx->inblock, sx->buffer, sizeof(sx->buffer), '2',
2429 sx->ob->command_timeout))
2430 {
2431 if (errno == 0 && sx->buffer[0] == '4')
2432 {
2433 errno = ERRNO_MAIL4XX;
2434 sx->addrlist->more_errno |= ((sx->buffer[1] - '0')*10 + sx->buffer[2] - '0') << 8;
2435 }
2436 return -1;
2437 }
2438 sx->pending_MAIL = FALSE;
2439 break;
2440
2441 /* otherwise zero: command queued for pipeline */
2442 }
2443
2444 /* Pass over all the relevant recipient addresses for this host, which are the
2445 ones that have status PENDING_DEFER. If we are using PIPELINING, we can send
2446 several before we have to read the responses for those seen so far. This
2447 checking is done by a subroutine because it also needs to be done at the end.
2448 Send only up to max_rcpt addresses at a time, leaving next_addr pointing to
2449 the next one if not all are sent.
2450
2451 In the MUA wrapper situation, we want to flush the PIPELINING buffer for the
2452 last address because we want to abort if any recipients have any kind of
2453 problem, temporary or permanent. We know that all recipient addresses will have
2454 the PENDING_DEFER status, because only one attempt is ever made, and we know
2455 that max_rcpt will be large, so all addresses will be done at once.
2456
2457 For verify we flush the pipeline after any (the only) rcpt address. */
2458
2459 for (addr = sx->first_addr, address_count = 0;
2460 addr && address_count < sx->max_rcpt;
2461 addr = addr->next) if (addr->transport_return == PENDING_DEFER)
2462 {
2463 int count;
2464 BOOL no_flush;
2465 uschar * rcpt_addr;
2466
2467 addr->dsn_aware = sx->peer_offered & PEER_OFFERED_DSN
2468 ? dsn_support_yes : dsn_support_no;
2469
2470 address_count++;
2471 no_flush = pipelining_active && !sx->verify && (!mua_wrapper || addr->next);
2472
2473 build_rcptcmd_options(sx, addr);
2474
2475 /* Now send the RCPT command, and process outstanding responses when
2476 necessary. After a timeout on RCPT, we just end the function, leaving the
2477 yield as OK, because this error can often mean that there is a problem with
2478 just one address, so we don't want to delay the host. */
2479
2480 rcpt_addr = transport_rcpt_address(addr, sx->tblock->rcpt_include_affixes);
2481
2482 #ifdef SUPPORT_I18N
2483 if ( testflag(sx->addrlist, af_utf8_downcvt)
2484 && !(rcpt_addr = string_address_utf8_to_alabel(rcpt_addr, NULL))
2485 )
2486 {
2487 /*XXX could we use a per-address errstr here? Not fail the whole send? */
2488 errno = ERRNO_EXPANDFAIL;
2489 return -5; /*XXX too harsh? */
2490 }
2491 #endif
2492
2493 count = smtp_write_command(&sx->outblock, no_flush, "RCPT TO:<%s>%s%s\r\n",
2494 rcpt_addr, sx->igquotstr, sx->buffer);
2495
2496 if (count < 0) return -5;
2497 if (count > 0)
2498 {
2499 switch(sync_responses(sx, count, 0))
2500 {
2501 case 3: sx->ok = TRUE; /* 2xx & 5xx => OK & progress made */
2502 case 2: sx->completed_addr = TRUE; /* 5xx (only) => progress made */
2503 break;
2504
2505 case 1: sx->ok = TRUE; /* 2xx (only) => OK, but if LMTP, */
2506 if (!sx->lmtp) /* can't tell about progress yet */
2507 sx->completed_addr = TRUE;
2508 case 0: /* No 2xx or 5xx, but no probs */
2509 break;
2510
2511 case -1: return -3; /* Timeout on RCPT */
2512 case -2: return -2; /* non-MAIL read i/o error */
2513 default: return -1; /* any MAIL error */
2514 }
2515 sx->pending_MAIL = FALSE; /* Dealt with MAIL */
2516 }
2517 } /* Loop for next address */
2518
2519 sx->next_addr = addr;
2520 return 0;
2521 }
2522
2523
2524 #ifdef SUPPORT_TLS
2525 /*****************************************************
2526 * Proxy TLS connection for another transport process *
2527 ******************************************************/
2528 /*
2529 Use the given buffer as a staging area, and select on both the given fd
2530 and the TLS'd client-fd for data to read (per the coding in ip_recv() and
2531 fd_ready() this is legitimate). Do blocking full-size writes, and reads
2532 under a timeout.
2533
2534 Arguments:
2535 buf space to use for buffering
2536 bufsiz size of buffer
2537 proxy_fd comms to proxied process
2538 timeout per-read timeout, seconds
2539 */
2540
2541 void
2542 smtp_proxy_tls(uschar * buf, size_t bsize, int proxy_fd, int timeout)
2543 {
2544 fd_set fds;
2545 int max_fd = MAX(proxy_fd, tls_out.active) + 1;
2546 int rc, i, fd_bits, nbytes;
2547
2548 set_process_info("proxying TLS connection for continued transport");
2549 FD_ZERO(&fds);
2550 FD_SET(tls_out.active, &fds);
2551 FD_SET(proxy_fd, &fds);
2552
2553 for (fd_bits = 3; fd_bits; )
2554 {
2555 time_t time_left = timeout;
2556 time_t time_start = time(NULL);
2557
2558 /* wait for data */
2559 do
2560 {
2561 struct timeval tv = { time_left, 0 };
2562
2563 rc = select(max_fd, (SELECT_ARG2_TYPE *)&fds, NULL, NULL, &tv);
2564
2565 if (rc < 0 && errno == EINTR)
2566 if ((time_left -= time(NULL) - time_start) > 0) continue;
2567
2568 if (rc <= 0)
2569 {
2570 DEBUG(D_transport) if (rc == 0) debug_printf("%s: timed out\n", __FUNCTION__);
2571 return;
2572 }
2573 }
2574 while (rc < 0 || !(FD_ISSET(tls_out.active, &fds) || FD_ISSET(proxy_fd, &fds)));
2575
2576 /* handle inbound data */
2577 if (FD_ISSET(tls_out.active, &fds))
2578 if ((rc = tls_read(FALSE, buf, bsize)) <= 0)
2579 {
2580 fd_bits &= ~1;
2581 FD_CLR(tls_out.active, &fds);
2582 shutdown(proxy_fd, SHUT_WR);
2583 }
2584 else
2585 {
2586 for (nbytes = 0; rc - nbytes > 0; nbytes += i)
2587 if ((i = write(proxy_fd, buf + nbytes, rc - nbytes)) < 0) return;
2588 }
2589 else if (fd_bits & 1)
2590 FD_SET(tls_out.active, &fds);
2591
2592 /* handle outbound data */
2593 if (FD_ISSET(proxy_fd, &fds))
2594 if ((rc = read(proxy_fd, buf, bsize)) <= 0)
2595 {
2596 fd_bits &= ~2;
2597 FD_CLR(proxy_fd, &fds);
2598 shutdown(tls_out.active, SHUT_WR);
2599 }
2600 else
2601 {
2602 for (nbytes = 0; rc - nbytes > 0; nbytes += i)
2603 if ((i = tls_write(FALSE, buf + nbytes, rc - nbytes)) < 0) return;
2604 }
2605 else if (fd_bits & 2)
2606 FD_SET(proxy_fd, &fds);
2607 }
2608 }
2609 #endif
2610
2611
2612 /*************************************************
2613 * Deliver address list to given host *
2614 *************************************************/
2615
2616 /* If continue_hostname is not null, we get here only when continuing to
2617 deliver down an existing channel. The channel was passed as the standard
2618 input. TLS is never active on a passed channel; the previous process always
2619 closes it down before passing the connection on.
2620
2621 Otherwise, we have to make a connection to the remote host, and do the
2622 initial protocol exchange.
2623
2624 When running as an MUA wrapper, if the sender or any recipient is rejected,
2625 temporarily or permanently, we force failure for all recipients.
2626
2627 Arguments:
2628 addrlist chain of potential addresses to deliver; only those whose
2629 transport_return field is set to PENDING_DEFER are currently
2630 being processed; others should be skipped - they have either
2631 been delivered to an earlier host or IP address, or been
2632 failed by one of them.
2633 host host to deliver to
2634 host_af AF_INET or AF_INET6
2635 port default TCP/IP port to use, in host byte order
2636 interface interface to bind to, or NULL
2637 tblock transport instance block
2638 message_defer set TRUE if yield is OK, but all addresses were deferred
2639 because of a non-recipient, non-host failure, that is, a
2640 4xx response to MAIL FROM, DATA, or ".". This is a defer
2641 that is specific to the message.
2642 suppress_tls if TRUE, don't attempt a TLS connection - this is set for
2643 a second attempt after TLS initialization fails
2644
2645 Returns: OK - the connection was made and the delivery attempted;
2646 the result for each address is in its data block.
2647 DEFER - the connection could not be made, or something failed
2648 while setting up the SMTP session, or there was a
2649 non-message-specific error, such as a timeout.
2650 ERROR - a filter command is specified for this transport,
2651 and there was a problem setting it up; OR helo_data
2652 or add_headers or authenticated_sender is specified
2653 for this transport, and the string failed to expand
2654 */
2655
2656 static int
2657 smtp_deliver(address_item *addrlist, host_item *host, int host_af, int port,
2658 uschar *interface, transport_instance *tblock,
2659 BOOL *message_defer, BOOL suppress_tls)
2660 {
2661 address_item *addr;
2662 int yield = OK;
2663 int save_errno;
2664 int rc;
2665 time_t start_delivery_time = time(NULL);
2666
2667 BOOL pass_message = FALSE;
2668 uschar *message = NULL;
2669 uschar new_message_id[MESSAGE_ID_LENGTH + 1];
2670 uschar *p;
2671
2672 smtp_context sx;
2673
2674 suppress_tls = suppress_tls; /* stop compiler warning when no TLS support */
2675 *message_defer = FALSE;
2676
2677 sx.addrlist = addrlist;
2678 sx.host = host;
2679 sx.host_af = host_af,
2680 sx.port = port;
2681 sx.interface = interface;
2682 sx.helo_data = NULL;
2683 sx.tblock = tblock;
2684 sx.verify = FALSE;
2685
2686 /* Get the channel set up ready for a message (MAIL FROM being the next
2687 SMTP command to send */
2688
2689 if ((rc = smtp_setup_conn(&sx, suppress_tls)) != OK)
2690 return rc;
2691
2692 /* If there is a filter command specified for this transport, we can now
2693 set it up. This cannot be done until the identify of the host is known. */
2694
2695 if (tblock->filter_command)
2696 {
2697 BOOL rc;
2698 uschar fbuf[64];
2699 sprintf(CS fbuf, "%.50s transport", tblock->name);
2700 rc = transport_set_up_command(&transport_filter_argv, tblock->filter_command,
2701 TRUE, DEFER, addrlist, fbuf, NULL);
2702 transport_filter_timeout = tblock->filter_timeout;
2703
2704 /* On failure, copy the error to all addresses, abandon the SMTP call, and
2705 yield ERROR. */
2706
2707 if (!rc)
2708 {
2709 set_errno_nohost(addrlist->next, addrlist->basic_errno, addrlist->message, DEFER,
2710 FALSE);
2711 yield = ERROR;
2712 goto SEND_QUIT;
2713 }
2714
2715 if ( transport_filter_argv
2716 && *transport_filter_argv
2717 && **transport_filter_argv
2718 && sx.peer_offered & PEER_OFFERED_CHUNKING
2719 )
2720 {
2721 sx.peer_offered &= ~PEER_OFFERED_CHUNKING;
2722 DEBUG(D_transport) debug_printf("CHUNKING not usable due to transport filter\n");
2723 }
2724 }
2725
2726
2727 /* For messages that have more than the maximum number of envelope recipients,
2728 we want to send several transactions down the same SMTP connection. (See
2729 comments in deliver.c as to how this reconciles, heuristically, with
2730 remote_max_parallel.) This optimization was added to Exim after the following
2731 code was already working. The simplest way to put it in without disturbing the
2732 code was to use a goto to jump back to this point when there is another
2733 transaction to handle. */
2734
2735 SEND_MESSAGE:
2736 sx.from_addr = return_path;
2737 sx.first_addr = sx.sync_addr = addrlist;
2738 sx.ok = FALSE;
2739 sx.send_rset = TRUE;
2740 sx.completed_addr = FALSE;
2741
2742
2743 /* If we are a continued-connection-after-verify the MAIL and RCPT
2744 commands were already sent; do not re-send but do mark the addrs as
2745 having been accepted up to RCPT stage. A traditional cont-conn
2746 always has a sequence number greater than one. */
2747
2748 if (continue_hostname && continue_sequence == 1)
2749 {
2750 address_item * addr;
2751
2752 sx.peer_offered = smtp_peer_options;
2753 sx.ok = TRUE;
2754 sx.next_addr = NULL;
2755
2756 for (addr = addrlist; addr; addr = addr->next)
2757 addr->transport_return = PENDING_OK;
2758 }
2759 else
2760 {
2761 /* Initiate a message transfer. */
2762
2763 switch(smtp_write_mail_and_rcpt_cmds(&sx, &yield))
2764 {
2765 case 0: break;
2766 case -1: case -2: goto RESPONSE_FAILED;
2767 case -3: goto END_OFF;
2768 case -4: goto SEND_QUIT;
2769 default: goto SEND_FAILED;
2770 }
2771
2772 /* If we are an MUA wrapper, abort if any RCPTs were rejected, either
2773 permanently or temporarily. We should have flushed and synced after the last
2774 RCPT. */
2775
2776 if (mua_wrapper)
2777 {
2778 address_item *badaddr;
2779 for (badaddr = sx.first_addr; badaddr; badaddr = badaddr->next)
2780 if (badaddr->transport_return != PENDING_OK)
2781 {
2782 /*XXX could we find a better errno than 0 here? */
2783 set_errno_nohost(addrlist, 0, badaddr->message, FAIL,
2784 testflag(badaddr, af_pass_message));
2785 sx.ok = FALSE;
2786 break;
2787 }
2788 }
2789 }
2790
2791 /* If ok is TRUE, we know we have got at least one good recipient, and must now
2792 send DATA, but if it is FALSE (in the normal, non-wrapper case), we may still
2793 have a good recipient buffered up if we are pipelining. We don't want to waste
2794 time sending DATA needlessly, so we only send it if either ok is TRUE or if we
2795 are pipelining. The responses are all handled by sync_responses().
2796 If using CHUNKING, do not send a BDAT until we know how big a chunk we want
2797 to send is. */
2798
2799 if ( !(sx.peer_offered & PEER_OFFERED_CHUNKING)
2800 && (sx.ok || (pipelining_active && !mua_wrapper)))
2801 {
2802 int count = smtp_write_command(&sx.outblock, FALSE, "DATA\r\n");
2803
2804 if (count < 0) goto SEND_FAILED;
2805 switch(sync_responses(&sx, count, sx.ok ? +1 : -1))
2806 {
2807 case 3: sx.ok = TRUE; /* 2xx & 5xx => OK & progress made */
2808 case 2: sx.completed_addr = TRUE; /* 5xx (only) => progress made */
2809 break;
2810
2811 case 1: sx.ok = TRUE; /* 2xx (only) => OK, but if LMTP, */
2812 if (!sx.lmtp) sx.completed_addr = TRUE; /* can't tell about progress yet */
2813 case 0: break; /* No 2xx or 5xx, but no probs */
2814
2815 case -1: goto END_OFF; /* Timeout on RCPT */
2816 default: goto RESPONSE_FAILED; /* I/O error, or any MAIL/DATA error */
2817 }
2818 pipelining_active = FALSE;
2819 data_command = string_copy(big_buffer); /* Save for later error message */
2820 }
2821
2822 /* If there were no good recipients (but otherwise there have been no
2823 problems), just set ok TRUE, since we have handled address-specific errors
2824 already. Otherwise, it's OK to send the message. Use the check/escape mechanism
2825 for handling the SMTP dot-handling protocol, flagging to apply to headers as
2826 well as body. Set the appropriate timeout value to be used for each chunk.
2827 (Haven't been able to make it work using select() for writing yet.) */
2828
2829 if (!(sx.peer_offered & PEER_OFFERED_CHUNKING) && !sx.ok)
2830 {
2831 /* Save the first address of the next batch. */
2832 sx.first_addr = sx.next_addr;
2833
2834 sx.ok = TRUE;
2835 }
2836 else
2837 {
2838 transport_ctx tctx = {
2839 tblock,
2840 addrlist,
2841 US".", US"..", /* Escaping strings */
2842 topt_use_crlf | topt_escape_headers
2843 | (tblock->body_only ? topt_no_headers : 0)
2844 | (tblock->headers_only ? topt_no_body : 0)
2845 | (tblock->return_path_add ? topt_add_return_path : 0)
2846 | (tblock->delivery_date_add ? topt_add_delivery_date : 0)
2847 | (tblock->envelope_to_add ? topt_add_envelope_to : 0)
2848 };
2849
2850 /* If using CHUNKING we need a callback from the generic transport
2851 support to us, for the sending of BDAT smtp commands and the reaping
2852 of responses. The callback needs a whole bunch of state so set up
2853 a transport-context structure to be passed around. */
2854
2855 if (sx.peer_offered & PEER_OFFERED_CHUNKING)
2856 {
2857 tctx.check_string = tctx.escape_string = NULL;
2858 tctx.options |= topt_use_bdat;
2859 tctx.chunk_cb = smtp_chunk_cmd_callback;
2860 sx.pending_BDAT = FALSE;
2861 sx.good_RCPT = sx.ok;
2862 sx.cmd_count = 0;
2863 tctx.smtp_context = &sx;
2864 }
2865 else
2866 tctx.options |= topt_end_dot;
2867
2868 /* Save the first address of the next batch. */
2869 sx.first_addr = sx.next_addr;
2870
2871 /* Responses from CHUNKING commands go in buffer. Otherwise,
2872 there has not been a response. */
2873
2874 sx.buffer[0] = 0;
2875
2876 sigalrm_seen = FALSE;
2877 transport_write_timeout = sx.ob->data_timeout;
2878 smtp_command = US"sending data block"; /* For error messages */
2879 DEBUG(D_transport|D_v)
2880 if (sx.peer_offered & PEER_OFFERED_CHUNKING)
2881 debug_printf(" will write message using CHUNKING\n");
2882 else
2883 debug_printf(" SMTP>> writing message and terminating \".\"\n");
2884 transport_count = 0;
2885
2886 #ifndef DISABLE_DKIM
2887 sx.ok = dkim_transport_write_message(sx.inblock.sock, &tctx, &sx.ob->dkim,
2888 CUSS &message);
2889 #else
2890 sx.ok = transport_write_message(sx.inblock.sock, &tctx, 0);
2891 #endif
2892
2893 /* transport_write_message() uses write() because it is called from other
2894 places to write to non-sockets. This means that under some OS (e.g. Solaris)
2895 it can exit with "Broken pipe" as its error. This really means that the
2896 socket got closed at the far end. */
2897
2898 transport_write_timeout = 0; /* for subsequent transports */
2899
2900 /* Failure can either be some kind of I/O disaster (including timeout),
2901 or the failure of a transport filter or the expansion of added headers.
2902 Or, when CHUNKING, it can be a protocol-detected failure. */
2903
2904 if (!sx.ok)
2905 if (message) goto SEND_FAILED;
2906 else goto RESPONSE_FAILED;
2907
2908 /* We used to send the terminating "." explicitly here, but because of
2909 buffering effects at both ends of TCP/IP connections, you don't gain
2910 anything by keeping it separate, so it might as well go in the final
2911 data buffer for efficiency. This is now done by setting the topt_end_dot
2912 flag above. */
2913
2914 smtp_command = US"end of data";
2915
2916 if (sx.peer_offered & PEER_OFFERED_CHUNKING && sx.cmd_count > 1)
2917 {
2918 /* Reap any outstanding MAIL & RCPT commands, but not a DATA-go-ahead */
2919 switch(sync_responses(&sx, sx.cmd_count-1, 0))
2920 {
2921 case 3: sx.ok = TRUE; /* 2xx & 5xx => OK & progress made */
2922 case 2: sx.completed_addr = TRUE; /* 5xx (only) => progress made */
2923 break;
2924
2925 case 1: sx.ok = TRUE; /* 2xx (only) => OK, but if LMTP, */
2926 if (!sx.lmtp) sx.completed_addr = TRUE; /* can't tell about progress yet */
2927 case 0: break; /* No 2xx or 5xx, but no probs */
2928
2929 case -1: goto END_OFF; /* Timeout on RCPT */
2930 default: goto RESPONSE_FAILED; /* I/O error, or any MAIL/DATA error */
2931 }
2932 }
2933
2934 #ifndef DISABLE_PRDR
2935 /* For PRDR we optionally get a partial-responses warning
2936 * followed by the individual responses, before going on with
2937 * the overall response. If we don't get the warning then deal
2938 * with per non-PRDR. */
2939 if(sx.prdr_active)
2940 {
2941 sx.ok = smtp_read_response(&sx.inblock, sx.buffer, sizeof(sx.buffer), '3',
2942 sx.ob->final_timeout);
2943 if (!sx.ok && errno == 0) switch(sx.buffer[0])
2944 {
2945 case '2': sx.prdr_active = FALSE;
2946 sx.ok = TRUE;
2947 break;
2948 case '4': errno = ERRNO_DATA4XX;
2949 addrlist->more_errno |=
2950 ((sx.buffer[1] - '0')*10 + sx.buffer[2] - '0') << 8;
2951 break;
2952 }
2953 }
2954 else
2955 #endif
2956
2957 /* For non-PRDR SMTP, we now read a single response that applies to the
2958 whole message. If it is OK, then all the addresses have been delivered. */
2959
2960 if (!sx.lmtp)
2961 {
2962 sx.ok = smtp_read_response(&sx.inblock, sx.buffer, sizeof(sx.buffer), '2',
2963 sx.ob->final_timeout);
2964 if (!sx.ok && errno == 0 && sx.buffer[0] == '4')
2965 {
2966 errno = ERRNO_DATA4XX;
2967 addrlist->more_errno |= ((sx.buffer[1] - '0')*10 + sx.buffer[2] - '0') << 8;
2968 }
2969 }
2970
2971 /* For LMTP, we get back a response for every RCPT command that we sent;
2972 some may be accepted and some rejected. For those that get a response, their
2973 status is fixed; any that are accepted have been handed over, even if later
2974 responses crash - at least, that's how I read RFC 2033.
2975
2976 If all went well, mark the recipient addresses as completed, record which
2977 host/IPaddress they were delivered to, and cut out RSET when sending another
2978 message down the same channel. Write the completed addresses to the journal
2979 now so that they are recorded in case there is a crash of hardware or
2980 software before the spool gets updated. Also record the final SMTP
2981 confirmation if needed (for SMTP only). */
2982
2983 if (sx.ok)
2984 {
2985 int flag = '=';
2986 int delivery_time = (int)(time(NULL) - start_delivery_time);
2987 int len;
2988 uschar *conf = NULL;
2989
2990 sx.send_rset = FALSE;
2991 pipelining_active = FALSE;
2992
2993 /* Set up confirmation if needed - applies only to SMTP */
2994
2995 if (
2996 #ifdef DISABLE_EVENT
2997 LOGGING(smtp_confirmation) &&
2998 #endif
2999 !sx.lmtp
3000 )
3001 {
3002 const uschar *s = string_printing(sx.buffer);
3003 /* deconst cast ok here as string_printing was checked to have alloc'n'copied */
3004 conf = (s == sx.buffer)? (uschar *)string_copy(s) : US s;
3005 }
3006
3007 /* Process all transported addresses - for LMTP or PRDR, read a status for
3008 each one. */
3009
3010 for (addr = addrlist; addr != sx.first_addr; addr = addr->next)
3011 {
3012 if (addr->transport_return != PENDING_OK) continue;
3013
3014 /* LMTP - if the response fails badly (e.g. timeout), use it for all the
3015 remaining addresses. Otherwise, it's a return code for just the one
3016 address. For temporary errors, add a retry item for the address so that
3017 it doesn't get tried again too soon. */
3018
3019 #ifndef DISABLE_PRDR
3020 if (sx.lmtp || sx.prdr_active)
3021 #else
3022 if (sx.lmtp)
3023 #endif
3024 {
3025 if (!smtp_read_response(&sx.inblock, sx.buffer, sizeof(sx.buffer), '2',
3026 sx.ob->final_timeout))
3027 {
3028 if (errno != 0 || sx.buffer[0] == 0) goto RESPONSE_FAILED;
3029 addr->message = string_sprintf(
3030 #ifndef DISABLE_PRDR
3031 "%s error after %s: %s", sx.prdr_active ? "PRDR":"LMTP",
3032 #else
3033 "LMTP error after %s: %s",
3034 #endif
3035 data_command, string_printing(sx.buffer));
3036 setflag(addr, af_pass_message); /* Allow message to go to user */
3037 if (sx.buffer[0] == '5')
3038 addr->transport_return = FAIL;
3039 else
3040 {
3041 errno = ERRNO_DATA4XX;
3042 addr->more_errno |= ((sx.buffer[1] - '0')*10 + sx.buffer[2] - '0') << 8;
3043 addr->transport_return = DEFER;
3044 #ifndef DISABLE_PRDR
3045 if (!sx.prdr_active)
3046 #endif
3047 retry_add_item(addr, addr->address_retry_key, 0);
3048 }
3049 continue;
3050 }
3051 sx.completed_addr = TRUE; /* NOW we can set this flag */
3052 if (LOGGING(smtp_confirmation))
3053 {
3054 const uschar *s = string_printing(sx.buffer);
3055 /* deconst cast ok here as string_printing was checked to have alloc'n'copied */
3056 conf = (s == sx.buffer) ? US string_copy(s) : US s;
3057 }
3058 }
3059
3060 /* SMTP, or success return from LMTP for this address. Pass back the
3061 actual host that was used. */
3062
3063 addr->transport_return = OK;
3064 addr->more_errno = delivery_time;
3065 addr->host_used = host;
3066 addr->special_action = flag;
3067 addr->message = conf;
3068 #ifndef DISABLE_PRDR
3069 if (sx.prdr_active) addr->flags |= af_prdr_used;
3070 #endif
3071 if (sx.peer_offered & PEER_OFFERED_CHUNKING) addr->flags |= af_chunking_used;
3072 flag = '-';
3073
3074 #ifndef DISABLE_PRDR
3075 if (!sx.prdr_active)
3076 #endif
3077 {
3078 /* Update the journal. For homonymic addresses, use the base address plus
3079 the transport name. See lots of comments in deliver.c about the reasons
3080 for the complications when homonyms are involved. Just carry on after
3081 write error, as it may prove possible to update the spool file later. */
3082
3083 if (testflag(addr, af_homonym))
3084 sprintf(CS sx.buffer, "%.500s/%s\n", addr->unique + 3, tblock->name);
3085 else
3086 sprintf(CS sx.buffer, "%.500s\n", addr->unique);
3087
3088 DEBUG(D_deliver) debug_printf("S:journalling %s\n", sx.buffer);
3089 len = Ustrlen(CS sx.buffer);
3090 if (write(journal_fd, sx.buffer, len) != len)
3091 log_write(0, LOG_MAIN|LOG_PANIC, "failed to write journal for "
3092 "%s: %s", sx.buffer, strerror(errno));
3093 }
3094 }
3095
3096 #ifndef DISABLE_PRDR
3097 if (sx.prdr_active)
3098 {
3099 /* PRDR - get the final, overall response. For any non-success
3100 upgrade all the address statuses. */
3101 sx.ok = smtp_read_response(&sx.inblock, sx.buffer, sizeof(sx.buffer), '2',
3102 sx.ob->final_timeout);
3103 if (!sx.ok)
3104 {
3105 if(errno == 0 && sx.buffer[0] == '4')
3106 {
3107 errno = ERRNO_DATA4XX;
3108 addrlist->more_errno |= ((sx.buffer[1] - '0')*10 + sx.buffer[2] - '0') << 8;
3109 }
3110 for (addr = addrlist; addr != sx.first_addr; addr = addr->next)
3111 if (sx.buffer[0] == '5' || addr->transport_return == OK)
3112 addr->transport_return = PENDING_OK; /* allow set_errno action */
3113 goto RESPONSE_FAILED;
3114 }
3115
3116 /* Update the journal, or setup retry. */
3117 for (addr = addrlist; addr != sx.first_addr; addr = addr->next)
3118 if (addr->transport_return == OK)
3119 {
3120 if (testflag(addr, af_homonym))
3121 sprintf(CS sx.buffer, "%.500s/%s\n", addr->unique + 3, tblock->name);
3122 else
3123 sprintf(CS sx.buffer, "%.500s\n", addr->unique);
3124
3125 DEBUG(D_deliver) debug_printf("journalling(PRDR) %s\n", sx.buffer);
3126 len = Ustrlen(CS sx.buffer);
3127 if (write(journal_fd, sx.buffer, len) != len)
3128 log_write(0, LOG_MAIN|LOG_PANIC, "failed to write journal for "
3129 "%s: %s", sx.buffer, strerror(errno));
3130 }
3131 else if (addr->transport_return == DEFER)
3132 retry_add_item(addr, addr->address_retry_key, -2);
3133 }
3134 #endif
3135
3136 /* Ensure the journal file is pushed out to disk. */
3137
3138 if (EXIMfsync(journal_fd) < 0)
3139 log_write(0, LOG_MAIN|LOG_PANIC, "failed to fsync journal: %s",
3140 strerror(errno));
3141 }
3142 }
3143
3144
3145 /* Handle general (not specific to one address) failures here. The value of ok
3146 is used to skip over this code on the falling through case. A timeout causes a
3147 deferral. Other errors may defer or fail according to the response code, and
3148 may set up a special errno value, e.g. after connection chopped, which is
3149 assumed if errno == 0 and there is no text in the buffer. If control reaches
3150 here during the setting up phase (i.e. before MAIL FROM) then always defer, as
3151 the problem is not related to this specific message. */
3152
3153 if (!sx.ok)
3154 {
3155 int code, set_rc;
3156 uschar * set_message;
3157
3158 RESPONSE_FAILED:
3159 {
3160 save_errno = errno;
3161 message = NULL;
3162 sx.send_quit = check_response(host, &save_errno, addrlist->more_errno,
3163 sx.buffer, &code, &message, &pass_message);
3164 goto FAILED;
3165 }
3166
3167 SEND_FAILED:
3168 {
3169 save_errno = errno;
3170 code = '4';
3171 message = string_sprintf("send() to %s [%s] failed: %s",
3172 host->name, host->address, message ? message : US strerror(save_errno));
3173 sx.send_quit = FALSE;
3174 goto FAILED;
3175 }
3176
3177 FAILED:
3178 {
3179 BOOL message_error;
3180
3181 sx.ok = FALSE; /* For when reached by GOTO */
3182 set_message = message;
3183
3184 /* We want to handle timeouts after MAIL or "." and loss of connection after
3185 "." specially. They can indicate a problem with the sender address or with
3186 the contents of the message rather than a real error on the connection. These
3187 cases are treated in the same way as a 4xx response. This next bit of code
3188 does the classification. */
3189
3190 switch(save_errno)
3191 {
3192 case 0:
3193 case ERRNO_MAIL4XX:
3194 case ERRNO_DATA4XX:
3195 message_error = TRUE;
3196 break;
3197
3198 case ETIMEDOUT:
3199 message_error = Ustrncmp(smtp_command,"MAIL",4) == 0 ||
3200 Ustrncmp(smtp_command,"end ",4) == 0;
3201 break;
3202
3203 case ERRNO_SMTPCLOSED:
3204 message_error = Ustrncmp(smtp_command,"end ",4) == 0;
3205 break;
3206
3207 default:
3208 message_error = FALSE;
3209 break;
3210 }
3211
3212 /* Handle the cases that are treated as message errors. These are:
3213
3214 (a) negative response or timeout after MAIL
3215 (b) negative response after DATA
3216 (c) negative response or timeout or dropped connection after "."
3217 (d) utf8 support required and not offered
3218
3219 It won't be a negative response or timeout after RCPT, as that is dealt
3220 with separately above. The action in all cases is to set an appropriate
3221 error code for all the addresses, but to leave yield set to OK because the
3222 host itself has not failed. Of course, it might in practice have failed
3223 when we've had a timeout, but if so, we'll discover that at the next
3224 delivery attempt. For a temporary error, set the message_defer flag, and
3225 write to the logs for information if this is not the last host. The error
3226 for the last host will be logged as part of the address's log line. */
3227
3228 if (message_error)
3229 {
3230 if (mua_wrapper) code = '5'; /* Force hard failure in wrapper mode */
3231
3232 /* If there's an errno, the message contains just the identity of
3233 the host. */
3234
3235 if (code == '5')
3236 set_rc = FAIL;
3237 else /* Anything other than 5 is treated as temporary */
3238 {
3239 set_rc = DEFER;
3240 if (save_errno > 0)
3241 message = US string_sprintf("%s: %s", message, strerror(save_errno));
3242 if (host->next != NULL) log_write(0, LOG_MAIN, "%s", message);
3243 msglog_line(host, message);
3244 *message_defer = TRUE;
3245 }
3246 }
3247
3248 /* Otherwise, we have an I/O error or a timeout other than after MAIL or
3249 ".", or some other transportation error. We defer all addresses and yield
3250 DEFER, except for the case of failed add_headers expansion, or a transport
3251 filter failure, when the yield should be ERROR, to stop it trying other
3252 hosts. */
3253
3254 else
3255 {
3256 set_rc = DEFER;
3257 yield = (save_errno == ERRNO_CHHEADER_FAIL ||
3258 save_errno == ERRNO_FILTER_FAIL)? ERROR : DEFER;
3259 }
3260 }
3261
3262 set_errno(addrlist, save_errno, set_message, set_rc, pass_message, host
3263 #ifdef EXPERIMENTAL_DSN_INFO
3264 , sx.smtp_greeting, sx.helo_response
3265 #endif
3266 );
3267 }
3268
3269
3270 /* If all has gone well, send_quit will be set TRUE, implying we can end the
3271 SMTP session tidily. However, if there were too many addresses to send in one
3272 message (indicated by first_addr being non-NULL) we want to carry on with the
3273 rest of them. Also, it is desirable to send more than one message down the SMTP
3274 connection if there are several waiting, provided we haven't already sent so
3275 many as to hit the configured limit. The function transport_check_waiting looks
3276 for a waiting message and returns its id. Then transport_pass_socket tries to
3277 set up a continued delivery by passing the socket on to another process. The
3278 variable send_rset is FALSE if a message has just been successfully transfered.
3279
3280 If we are already sending down a continued channel, there may be further
3281 addresses not yet delivered that are aimed at the same host, but which have not
3282 been passed in this run of the transport. In this case, continue_more will be
3283 true, and all we should do is send RSET if necessary, and return, leaving the
3284 channel open.
3285
3286 However, if no address was disposed of, i.e. all addresses got 4xx errors, we
3287 do not want to continue with other messages down the same channel, because that
3288 can lead to looping between two or more messages, all with the same,
3289 temporarily failing address(es). [The retry information isn't updated yet, so
3290 new processes keep on trying.] We probably also don't want to try more of this
3291 message's addresses either.
3292
3293 If we have started a TLS session, we have to end it before passing the
3294 connection to a new process. However, not all servers can handle this (Exim
3295 can), so we do not pass such a connection on if the host matches
3296 hosts_nopass_tls. */
3297
3298 DEBUG(D_transport)
3299 debug_printf("ok=%d send_quit=%d send_rset=%d continue_more=%d "
3300 "yield=%d first_address is %sNULL\n", sx.ok, sx.send_quit,
3301 sx.send_rset, continue_more, yield, sx.first_addr ? "not " : "");
3302
3303 if (sx.completed_addr && sx.ok && sx.send_quit)
3304 {
3305 BOOL more;
3306 smtp_compare_t t_compare;
3307
3308 t_compare.tblock = tblock;
3309 t_compare.current_sender_address = sender_address;
3310
3311 if ( sx.first_addr != NULL
3312 || continue_more
3313 || (
3314 #ifdef SUPPORT_TLS
3315 ( tls_out.active < 0 && !continue_proxy_cipher
3316 || verify_check_given_host(&sx.ob->hosts_nopass_tls, host) != OK
3317 )
3318 &&
3319 #endif
3320 transport_check_waiting(tblock->name, host->name,
3321 tblock->connection_max_messages, new_message_id, &more,
3322 (oicf)smtp_are_same_identities, (void*)&t_compare)
3323 ) )
3324 {
3325 uschar *msg;
3326 BOOL pass_message;
3327
3328 if (sx.send_rset)
3329 if (! (sx.ok = smtp_write_command(&sx.outblock, FALSE, "RSET\r\n") >= 0))
3330 {
3331 msg = US string_sprintf("send() to %s [%s] failed: %s", host->name,
3332 host->address, strerror(errno));
3333 sx.send_quit = FALSE;
3334 }
3335 else if (! (sx.ok = smtp_read_response(&sx.inblock, sx.buffer,
3336 sizeof(sx.buffer), '2', sx.ob->command_timeout)))
3337 {
3338 int code;
3339 sx.send_quit = check_response(host, &errno, 0, sx.buffer, &code, &msg,
3340 &pass_message);
3341 if (!sx.send_quit)
3342 {
3343 DEBUG(D_transport) debug_printf("H=%s [%s] %s\n",
3344 host->name, host->address, msg);
3345 }
3346 }
3347
3348 /* Either RSET was not needed, or it succeeded */
3349
3350 if (sx.ok)
3351 {
3352 int pfd[2];
3353 int socket_fd = sx.inblock.sock;
3354
3355
3356 if (sx.first_addr != NULL) /* More addresses still to be sent */
3357 { /* in this run of the transport */
3358 continue_sequence++; /* Causes * in logging */
3359 goto SEND_MESSAGE;
3360 }
3361 if (continue_more) return yield; /* More addresses for another run */
3362
3363 /* Pass the connection on to a new Exim process. */
3364 #ifdef SUPPORT_TLS
3365 if (tls_out.active >= 0)
3366 if (verify_check_given_host(&sx.ob->hosts_noproxy_tls, host) == OK)
3367 {
3368 /* Pass the socket, for direct use, to a new Exim process. Before
3369 doing so, we must shut down TLS. Not all MTAs allow for the
3370 continuation of the SMTP session when TLS is shut down. We test for
3371 this by sending a new EHLO. If we don't get a good response, we don't
3372 attempt to pass the socket on. */
3373
3374 tls_close(FALSE, TRUE);
3375 smtp_peer_options = smtp_peer_options_wrap;
3376 sx.ok = !sx.smtps
3377 && smtp_write_command(&sx.outblock, FALSE,
3378 "EHLO %s\r\n", sx.helo_data) >= 0
3379 && smtp_read_response(&sx.inblock, sx.buffer, sizeof(sx.buffer),
3380 '2', sx.ob->command_timeout);
3381 }
3382 else
3383 {
3384 /* Set up a pipe for proxying TLS for the new transport process */
3385
3386 smtp_peer_options |= PEER_OFFERED_TLS;
3387 if (sx.ok = (socketpair(AF_UNIX, SOCK_STREAM, 0, pfd) == 0))
3388 socket_fd = pfd[1];
3389 else
3390 set_errno(sx.first_addr, errno, US"internal allocation problem",
3391 DEFER, FALSE, host
3392 # ifdef EXPERIMENTAL_DSN_INFO
3393 , sx.smtp_greeting, sx.helo_response
3394 # endif
3395 );
3396 }
3397 #endif
3398
3399 /* If the socket is successfully passed, we mustn't send QUIT (or
3400 indeed anything!) from here. */
3401
3402 /*XXX DSN_INFO: assume likely to do new HELO; but for greet we'll want to
3403 propagate it from the initial
3404 */
3405 if (sx.ok && transport_pass_socket(tblock->name, host->name,
3406 host->address, new_message_id, socket_fd))
3407 {
3408 sx.send_quit = FALSE;
3409
3410 /* If TLS is still active, we need to proxy it for the transport we
3411 just passed the baton to. Fork a child to to do it, and return to
3412 get logging done asap. Which way to place the work makes assumptions
3413 about post-fork prioritisation which may not hold on all platforms. */
3414 #ifdef SUPPORT_TLS
3415 if (tls_out.active >= 0)
3416 {
3417 int pid = fork();
3418 if (pid > 0) /* parent */
3419 {
3420 tls_close(FALSE, FALSE);
3421 (void)close(sx.inblock.sock);
3422 continue_transport = NULL;
3423 continue_hostname = NULL;
3424 return yield;
3425 }
3426 else if (pid == 0) /* child */
3427 {
3428 smtp_proxy_tls(sx.buffer, sizeof(sx.buffer), pfd[0], sx.ob->command_timeout);
3429 exim_exit(0);
3430 }
3431 }
3432 #endif
3433 }
3434 }
3435
3436 /* If RSET failed and there are addresses left, they get deferred. */
3437 else
3438 set_errno(sx.first_addr, errno, msg, DEFER, FALSE, host
3439 #ifdef EXPERIMENTAL_DSN_INFO
3440 , sx.smtp_greeting, sx.helo_response
3441 #endif
3442 );
3443 }
3444 }
3445
3446 /* End off tidily with QUIT unless the connection has died or the socket has
3447 been passed to another process. There has been discussion on the net about what
3448 to do after sending QUIT. The wording of the RFC suggests that it is necessary
3449 to wait for a response, but on the other hand, there isn't anything one can do
3450 with an error response, other than log it. Exim used to do that. However,
3451 further discussion suggested that it is positively advantageous not to wait for
3452 the response, but to close the session immediately. This is supposed to move
3453 the TCP/IP TIME_WAIT state from the server to the client, thereby removing some
3454 load from the server. (Hosts that are both servers and clients may not see much
3455 difference, of course.) Further discussion indicated that this was safe to do
3456 on Unix systems which have decent implementations of TCP/IP that leave the
3457 connection around for a while (TIME_WAIT) after the application has gone away.
3458 This enables the response sent by the server to be properly ACKed rather than
3459 timed out, as can happen on broken TCP/IP implementations on other OS.
3460
3461 This change is being made on 31-Jul-98. After over a year of trouble-free
3462 operation, the old commented-out code was removed on 17-Sep-99. */
3463
3464 SEND_QUIT:
3465 if (sx.send_quit) (void)smtp_write_command(&sx.outblock, FALSE, "QUIT\r\n");
3466
3467 END_OFF:
3468
3469 #ifdef SUPPORT_TLS
3470 tls_close(FALSE, TRUE);
3471 #endif
3472
3473 /* Close the socket, and return the appropriate value, first setting
3474 works because the NULL setting is passed back to the calling process, and
3475 remote_max_parallel is forced to 1 when delivering over an existing connection,
3476
3477 If all went well and continue_more is set, we shouldn't actually get here if
3478 there are further addresses, as the return above will be taken. However,
3479 writing RSET might have failed, or there may be other addresses whose hosts are
3480 specified in the transports, and therefore not visible at top level, in which
3481 case continue_more won't get set. */
3482
3483 HDEBUG(D_transport|D_acl|D_v) debug_printf_indent(" SMTP(close)>>\n");
3484 if (sx.send_quit)
3485 {
3486 shutdown(sx.outblock.sock, SHUT_WR);
3487 if (fcntl(sx.inblock.sock, F_SETFL, O_NONBLOCK) == 0)
3488 for (rc = 16; read(sx.inblock.sock, sx.inbuffer, sizeof(sx.inbuffer)) > 0 && rc > 0;)
3489 rc--; /* drain socket */
3490 }
3491 (void)close(sx.inblock.sock);
3492
3493 #ifndef DISABLE_EVENT
3494 (void) event_raise(tblock->event_action, US"tcp:close", NULL);
3495 #endif
3496
3497 continue_transport = NULL;
3498 continue_hostname = NULL;
3499 return yield;
3500 }
3501
3502
3503
3504
3505 /*************************************************
3506 * Closedown entry point *
3507 *************************************************/
3508
3509 /* This function is called when exim is passed an open smtp channel
3510 from another incarnation, but the message which it has been asked
3511 to deliver no longer exists. The channel is on stdin.
3512
3513 We might do fancy things like looking for another message to send down
3514 the channel, but if the one we sought has gone, it has probably been
3515 delivered by some other process that itself will seek further messages,
3516 so just close down our connection.
3517
3518 Argument: pointer to the transport instance block
3519 Returns: nothing
3520 */
3521
3522 void
3523 smtp_transport_closedown(transport_instance *tblock)
3524 {
3525 smtp_transport_options_block *ob =
3526 (smtp_transport_options_block *)tblock->options_block;
3527 smtp_inblock inblock;
3528 smtp_outblock outblock;
3529 uschar buffer[256];
3530 uschar inbuffer[4096];
3531 uschar outbuffer[16];
3532
3533 inblock.sock = fileno(stdin);
3534 inblock.buffer = inbuffer;
3535 inblock.buffersize = sizeof(inbuffer);
3536 inblock.ptr = inbuffer;
3537 inblock.ptrend = inbuffer;
3538
3539 outblock.sock = inblock.sock;
3540 outblock.buffersize = sizeof(outbuffer);
3541 outblock.buffer = outbuffer;
3542 outblock.ptr = outbuffer;
3543 outblock.cmd_count = 0;
3544 outblock.authenticating = FALSE;
3545
3546 (void)smtp_write_command(&outblock, FALSE, "QUIT\r\n");
3547 (void)smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
3548 ob->command_timeout);
3549 (void)close(inblock.sock);
3550 }
3551
3552
3553
3554 /*************************************************
3555 * Prepare addresses for delivery *
3556 *************************************************/
3557
3558 /* This function is called to flush out error settings from previous delivery
3559 attempts to other hosts. It also records whether we got here via an MX record
3560 or not in the more_errno field of the address. We are interested only in
3561 addresses that are still marked DEFER - others may have got delivered to a
3562 previously considered IP address. Set their status to PENDING_DEFER to indicate
3563 which ones are relevant this time.
3564
3565 Arguments:
3566 addrlist the list of addresses
3567 host the host we are delivering to
3568
3569 Returns: the first address for this delivery
3570 */
3571
3572 static address_item *
3573 prepare_addresses(address_item *addrlist, host_item *host)
3574 {
3575 address_item *first_addr = NULL;
3576 address_item *addr;
3577 for (addr = addrlist; addr; addr = addr->next)
3578 if (addr->transport_return == DEFER)
3579 {
3580 if (!first_addr) first_addr = addr;
3581 addr->transport_return = PENDING_DEFER;
3582 addr->basic_errno = 0;
3583 addr->more_errno = (host->mx >= 0)? 'M' : 'A';
3584 addr->message = NULL;
3585 #ifdef SUPPORT_TLS
3586 addr->cipher = NULL;
3587 addr->ourcert = NULL;
3588 addr->peercert = NULL;
3589 addr->peerdn = NULL;
3590 addr->ocsp = OCSP_NOT_REQ;
3591 #endif
3592 #ifdef EXPERIMENTAL_DSN_INFO
3593 addr->smtp_greeting = NULL;
3594 addr->helo_response = NULL;
3595 #endif
3596 }
3597 return first_addr;
3598 }
3599
3600
3601
3602 /*************************************************
3603 * Main entry point *
3604 *************************************************/
3605
3606 /* See local README for interface details. As this is a remote transport, it is
3607 given a chain of addresses to be delivered in one connection, if possible. It
3608 always returns TRUE, indicating that each address has its own independent
3609 status set, except if there is a setting up problem, in which case it returns
3610 FALSE. */
3611
3612 BOOL
3613 smtp_transport_entry(
3614 transport_instance *tblock, /* data for this instantiation */
3615 address_item *addrlist) /* addresses we are working on */
3616 {
3617 int cutoff_retry;
3618 int port;
3619 int hosts_defer = 0;
3620 int hosts_fail = 0;
3621 int hosts_looked_up = 0;
3622 int hosts_retry = 0;
3623 int hosts_serial = 0;
3624 int hosts_total = 0;
3625 int total_hosts_tried = 0;
3626 address_item *addr;
3627 BOOL expired = TRUE;
3628 uschar *expanded_hosts = NULL;
3629 uschar *pistring;
3630 uschar *tid = string_sprintf("%s transport", tblock->name);
3631 smtp_transport_options_block *ob =
3632 (smtp_transport_options_block *)(tblock->options_block);
3633 host_item *hostlist = addrlist->host_list;
3634 host_item *host = NULL;
3635
3636 DEBUG(D_transport)
3637 {
3638 debug_printf("%s transport entered\n", tblock->name);
3639 for (addr = addrlist; addr; addr = addr->next)
3640 debug_printf(" %s\n", addr->address);
3641 if (hostlist)
3642 {
3643 debug_printf("hostlist:\n");
3644 for (host = hostlist; host; host = host->next)
3645 debug_printf(" %s:%d\n", host->name, host->port);
3646 }
3647 if (continue_hostname)
3648 debug_printf("already connected to %s [%s] (on fd %d)\n",
3649 continue_hostname, continue_host_address,
3650 cutthrough.fd >= 0 ? cutthrough.fd : 0);
3651 }
3652
3653 /* Set the flag requesting that these hosts be added to the waiting
3654 database if the delivery fails temporarily or if we are running with
3655 queue_smtp or a 2-stage queue run. This gets unset for certain
3656 kinds of error, typically those that are specific to the message. */
3657
3658 update_waiting = TRUE;
3659
3660 /* If a host list is not defined for the addresses - they must all have the
3661 same one in order to be passed to a single transport - or if the transport has
3662 a host list with hosts_override set, use the host list supplied with the
3663 transport. It is an error for this not to exist. */
3664
3665 if (!hostlist || (ob->hosts_override && ob->hosts))
3666 {
3667 if (!ob->hosts)
3668 {
3669 addrlist->message = string_sprintf("%s transport called with no hosts set",
3670 tblock->name);
3671 addrlist->transport_return = PANIC;
3672 return FALSE; /* Only top address has status */
3673 }
3674
3675 DEBUG(D_transport) debug_printf("using the transport's hosts: %s\n",
3676 ob->hosts);
3677
3678 /* If the transport's host list contains no '$' characters, and we are not
3679 randomizing, it is fixed and therefore a chain of hosts can be built once
3680 and for all, and remembered for subsequent use by other calls to this
3681 transport. If, on the other hand, the host list does contain '$', or we are
3682 randomizing its order, we have to rebuild it each time. In the fixed case,
3683 as the hosts string will never be used again, it doesn't matter that we
3684 replace all the : characters with zeros. */
3685
3686 if (!ob->hostlist)
3687 {
3688 uschar *s = ob->hosts;
3689
3690 if (Ustrchr(s, '$') != NULL)
3691 {
3692 if (!(expanded_hosts = expand_string(s)))
3693 {
3694 addrlist->message = string_sprintf("failed to expand list of hosts "
3695 "\"%s\" in %s transport: %s", s, tblock->name, expand_string_message);
3696 addrlist->transport_return = search_find_defer ? DEFER : PANIC;
3697 return FALSE; /* Only top address has status */
3698 }
3699 DEBUG(D_transport) debug_printf("expanded list of hosts \"%s\" to "
3700 "\"%s\"\n", s, expanded_hosts);
3701 s = expanded_hosts;
3702 }
3703 else
3704 if (ob->hosts_randomize) s = expanded_hosts = string_copy(s);
3705
3706 host_build_hostlist(&hostlist, s, ob->hosts_randomize);
3707
3708 /* Check that the expansion yielded something useful. */
3709 if (!hostlist)
3710 {
3711 addrlist->message =
3712 string_sprintf("%s transport has empty hosts setting", tblock->name);
3713 addrlist->transport_return = PANIC;
3714 return FALSE; /* Only top address has status */
3715 }
3716
3717 /* If there was no expansion of hosts, save the host list for
3718 next time. */
3719
3720 if (!expanded_hosts) ob->hostlist = hostlist;
3721 }
3722
3723 /* This is not the first time this transport has been run in this delivery;
3724 the host list was built previously. */
3725
3726 else
3727 hostlist = ob->hostlist;
3728 }
3729
3730 /* The host list was supplied with the address. If hosts_randomize is set, we
3731 must sort it into a random order if it did not come from MX records and has not
3732 already been randomized (but don't bother if continuing down an existing
3733 connection). */
3734
3735 else if (ob->hosts_randomize && hostlist->mx == MX_NONE && !continue_hostname)
3736 {
3737 host_item *newlist = NULL;
3738 while (hostlist)
3739 {
3740 host_item *h = hostlist;
3741 hostlist = hostlist->next;
3742
3743 h->sort_key = random_number(100);
3744
3745 if (!newlist)
3746 {
3747 h->next = NULL;
3748 newlist = h;
3749 }
3750 else if (h->sort_key < newlist->sort_key)
3751 {
3752 h->next = newlist;
3753 newlist = h;
3754 }
3755 else
3756 {
3757 host_item *hh = newlist;
3758 while (hh->next)
3759 {
3760 if (h->sort_key < hh->next->sort_key) break;
3761 hh = hh->next;
3762 }
3763 h->next = hh->next;
3764 hh->next = h;
3765 }
3766 }
3767
3768 hostlist = addrlist->host_list = newlist;
3769 }
3770
3771 /* Sort out the default port. */
3772
3773 if (!smtp_get_port(ob->port, addrlist, &port, tid)) return FALSE;
3774
3775 /* For each host-plus-IP-address on the list:
3776
3777 . If this is a continued delivery and the host isn't the one with the
3778 current connection, skip.
3779
3780 . If the status is unusable (i.e. previously failed or retry checked), skip.
3781
3782 . If no IP address set, get the address, either by turning the name into
3783 an address, calling gethostbyname if gethostbyname is on, or by calling
3784 the DNS. The DNS may yield multiple addresses, in which case insert the
3785 extra ones into the list.
3786
3787 . Get the retry data if not previously obtained for this address and set the
3788 field which remembers the state of this address. Skip if the retry time is
3789 not reached. If not, remember whether retry data was found. The retry string
3790 contains both the name and the IP address.
3791
3792 . Scan the list of addresses and mark those whose status is DEFER as
3793 PENDING_DEFER. These are the only ones that will be processed in this cycle
3794 of the hosts loop.
3795
3796 . Make a delivery attempt - addresses marked PENDING_DEFER will be tried.
3797 Some addresses may be successfully delivered, others may fail, and yet
3798 others may get temporary errors and so get marked DEFER.
3799
3800 . The return from the delivery attempt is OK if a connection was made and a
3801 valid SMTP dialogue was completed. Otherwise it is DEFER.
3802
3803 . If OK, add a "remove" retry item for this host/IPaddress, if any.
3804
3805 . If fail to connect, or other defer state, add a retry item.
3806
3807 . If there are any addresses whose status is still DEFER, carry on to the
3808 next host/IPaddress, unless we have tried the number of hosts given
3809 by hosts_max_try or hosts_max_try_hardlimit; otherwise return. Note that
3810 there is some fancy logic for hosts_max_try that means its limit can be
3811 overstepped in some circumstances.
3812
3813 If we get to the end of the list, all hosts have deferred at least one address,
3814 or not reached their retry times. If delay_after_cutoff is unset, it requests a
3815 delivery attempt to those hosts whose last try was before the arrival time of
3816 the current message. To cope with this, we have to go round the loop a second
3817 time. After that, set the status and error data for any addresses that haven't
3818 had it set already. */
3819
3820 for (cutoff_retry = 0;
3821 expired && cutoff_retry < (ob->delay_after_cutoff ? 1 : 2);
3822 cutoff_retry++)
3823 {
3824 host_item *nexthost = NULL;
3825 int unexpired_hosts_tried = 0;
3826
3827 for (host = hostlist;
3828 host
3829 && unexpired_hosts_tried < ob->hosts_max_try
3830 && total_hosts_tried < ob->hosts_max_try_hardlimit;
3831 host = nexthost)
3832 {
3833 int rc;
3834 int host_af;
3835 uschar *rs;
3836 BOOL host_is_expired = FALSE;
3837 BOOL message_defer = FALSE;
3838 BOOL some_deferred = FALSE;
3839 address_item *first_addr = NULL;
3840 uschar *interface = NULL;
3841 uschar *retry_host_key = NULL;
3842 uschar *retry_message_key = NULL;
3843 uschar *serialize_key = NULL;
3844
3845 /* Default next host is next host. :-) But this can vary if the
3846 hosts_max_try limit is hit (see below). It may also be reset if a host
3847 address is looked up here (in case the host was multihomed). */
3848
3849 nexthost = host->next;
3850
3851 /* If the address hasn't yet been obtained from the host name, look it up
3852 now, unless the host is already marked as unusable. If it is marked as
3853 unusable, it means that the router was unable to find its IP address (in
3854 the DNS or wherever) OR we are in the 2nd time round the cutoff loop, and
3855 the lookup failed last time. We don't get this far if *all* MX records
3856 point to non-existent hosts; that is treated as a hard error.
3857
3858 We can just skip this host entirely. When the hosts came from the router,
3859 the address will timeout based on the other host(s); when the address is
3860 looked up below, there is an explicit retry record added.
3861
3862 Note that we mustn't skip unusable hosts if the address is not unset; they
3863 may be needed as expired hosts on the 2nd time round the cutoff loop. */
3864
3865 if (!host->address)
3866 {
3867 int new_port, flags;
3868 host_item *hh;
3869
3870 if (host->status >= hstatus_unusable)
3871 {
3872 DEBUG(D_transport) debug_printf("%s has no address and is unusable - skipping\n",
3873 host->name);
3874 continue;
3875 }
3876
3877 DEBUG(D_transport) debug_printf("getting address for %s\n", host->name);
3878
3879 /* The host name is permitted to have an attached port. Find it, and
3880 strip it from the name. Just remember it for now. */
3881
3882 new_port = host_item_get_port(host);
3883
3884 /* Count hosts looked up */
3885
3886 hosts_looked_up++;
3887
3888 /* Find by name if so configured, or if it's an IP address. We don't
3889 just copy the IP address, because we need the test-for-local to happen. */
3890
3891 flags = HOST_FIND_BY_A;
3892 if (ob->dns_qualify_single) flags |= HOST_FIND_QUALIFY_SINGLE;
3893 if (ob->dns_search_parents) flags |= HOST_FIND_SEARCH_PARENTS;
3894
3895 if (ob->gethostbyname || string_is_ip_address(host->name, NULL) != 0)
3896 rc = host_find_byname(host, NULL, flags, NULL, TRUE);
3897 else
3898 rc = host_find_bydns(host, NULL, flags, NULL, NULL, NULL,
3899 &ob->dnssec, /* domains for request/require */
3900 NULL, NULL);
3901
3902 /* Update the host (and any additional blocks, resulting from
3903 multihoming) with a host-specific port, if any. */
3904
3905 for (hh = host; hh != nexthost; hh = hh->next) hh->port = new_port;
3906
3907 /* Failure to find the host at this time (usually DNS temporary failure)
3908 is really a kind of routing failure rather than a transport failure.
3909 Therefore we add a retry item of the routing kind, not to stop us trying
3910 to look this name up here again, but to ensure the address gets timed
3911 out if the failures go on long enough. A complete failure at this point
3912 commonly points to a configuration error, but the best action is still
3913 to carry on for the next host. */
3914
3915 if (rc == HOST_FIND_AGAIN || rc == HOST_FIND_SECURITY || rc == HOST_FIND_FAILED)
3916 {
3917 retry_add_item(addrlist, string_sprintf("R:%s", host->name), 0);
3918 expired = FALSE;
3919 if (rc == HOST_FIND_AGAIN) hosts_defer++; else hosts_fail++;
3920 DEBUG(D_transport) debug_printf("rc = %s for %s\n", (rc == HOST_FIND_AGAIN)?
3921 "HOST_FIND_AGAIN" : "HOST_FIND_FAILED", host->name);
3922 host->status = hstatus_unusable;
3923
3924 for (addr = addrlist; addr; addr = addr->next)
3925 {
3926 if (addr->transport_return != DEFER) continue;
3927 addr->basic_errno = ERRNO_UNKNOWNHOST;
3928 addr->message = string_sprintf(
3929 rc == HOST_FIND_SECURITY
3930 ? "lookup of IP address for %s was insecure"
3931 : "failed to lookup IP address for %s",
3932 host->name);
3933 }
3934 continue;
3935 }
3936
3937 /* If the host is actually the local host, we may have a problem, or
3938 there may be some cunning configuration going on. In the problem case,
3939 log things and give up. The default transport status is already DEFER. */
3940
3941 if (rc == HOST_FOUND_LOCAL && !ob->allow_localhost)
3942 {
3943 for (addr = addrlist; addr; addr = addr->next)
3944 {
3945 addr->basic_errno = 0;
3946 addr->message = string_sprintf("%s transport found host %s to be "
3947 "local", tblock->name, host->name);
3948 }
3949 goto END_TRANSPORT;
3950 }
3951 } /* End of block for IP address lookup */
3952
3953 /* If this is a continued delivery, we are interested only in the host
3954 which matches the name of the existing open channel. The check is put
3955 here after the local host lookup, in case the name gets expanded as a
3956 result of the lookup. Set expired FALSE, to save the outer loop executing
3957 twice. */
3958
3959 if ( continue_hostname
3960 && ( Ustrcmp(continue_hostname, host->name) != 0
3961 || Ustrcmp(continue_host_address, host->address) != 0
3962 ) )
3963 {
3964 expired = FALSE;
3965 continue; /* With next host */
3966 }
3967
3968 /* Reset the default next host in case a multihomed host whose addresses
3969 are not looked up till just above added to the host list. */
3970
3971 nexthost = host->next;
3972
3973 /* If queue_smtp is set (-odqs or the first part of a 2-stage run), or the
3974 domain is in queue_smtp_domains, we don't actually want to attempt any
3975 deliveries. When doing a queue run, queue_smtp_domains is always unset. If
3976 there is a lookup defer in queue_smtp_domains, proceed as if the domain
3977 were not in it. We don't want to hold up all SMTP deliveries! Except when
3978 doing a two-stage queue run, don't do this if forcing. */
3979
3980 if ((!deliver_force || queue_2stage) && (queue_smtp ||
3981 match_isinlist(addrlist->domain,
3982 (const uschar **)&queue_smtp_domains, 0,
3983 &domainlist_anchor, NULL, MCL_DOMAIN, TRUE, NULL) == OK))
3984 {
3985 expired = FALSE;
3986 for (addr = addrlist; addr; addr = addr->next)
3987 if (addr->transport_return == DEFER)
3988 addr->message = US"domain matches queue_smtp_domains, or -odqs set";
3989 continue; /* With next host */
3990 }
3991
3992 /* Count hosts being considered - purely for an intelligent comment
3993 if none are usable. */
3994
3995 hosts_total++;
3996
3997 /* Set $host and $host address now in case they are needed for the
3998 interface expansion or the serialize_hosts check; they remain set if an
3999 actual delivery happens. */
4000
4001 deliver_host = host->name;
4002 deliver_host_address = host->address;
4003 lookup_dnssec_authenticated = host->dnssec == DS_YES ? US"yes"
4004 : host->dnssec == DS_NO ? US"no"
4005 : US"";
4006
4007 /* Set up a string for adding to the retry key if the port number is not
4008 the standard SMTP port. A host may have its own port setting that overrides
4009 the default. */
4010
4011 pistring = string_sprintf(":%d", host->port == PORT_NONE
4012 ? port : host->port);
4013 if (Ustrcmp(pistring, ":25") == 0) pistring = US"";
4014
4015 /* Select IPv4 or IPv6, and choose an outgoing interface. If the interface
4016 string is set, even if constant (as different transports can have different
4017 constant settings), we must add it to the key that is used for retries,
4018 because connections to the same host from a different interface should be
4019 treated separately. */
4020
4021 host_af = Ustrchr(host->address, ':') == NULL ? AF_INET : AF_INET6;
4022 if ((rs = ob->interface) && *rs)
4023 {
4024 if (!smtp_get_interface(rs, host_af, addrlist, &interface, tid))
4025 return FALSE;
4026 pistring = string_sprintf("%s/%s", pistring, interface);
4027 }
4028
4029 /* The first time round the outer loop, check the status of the host by
4030 inspecting the retry data. The second time round, we are interested only
4031 in expired hosts that haven't been tried since this message arrived. */
4032
4033 if (cutoff_retry == 0)
4034 {
4035 BOOL incl_ip;
4036 /* Ensure the status of the address is set by checking retry data if
4037 necessary. There may be host-specific retry data (applicable to all
4038 messages) and also data for retries of a specific message at this host.
4039 If either of these retry records are actually read, the keys used are
4040 returned to save recomputing them later. */
4041
4042 if (exp_bool(addrlist, US"transport", tblock->name, D_transport,
4043 US"retry_include_ip_address", ob->retry_include_ip_address,
4044 ob->expand_retry_include_ip_address, &incl_ip) != OK)
4045 continue; /* with next host */
4046
4047 host_is_expired = retry_check_address(addrlist->domain, host, pistring,
4048 incl_ip, &retry_host_key, &retry_message_key);
4049
4050 DEBUG(D_transport) debug_printf("%s [%s]%s retry-status = %s\n", host->name,
4051 (host->address == NULL)? US"" : host->address, pistring,
4052 (host->status == hstatus_usable)? "usable" :
4053 (host->status == hstatus_unusable)? "unusable" :
4054 (host->status == hstatus_unusable_expired)? "unusable (expired)" : "?");
4055
4056 /* Skip this address if not usable at this time, noting if it wasn't
4057 actually expired, both locally and in the address. */
4058
4059 switch (host->status)
4060 {
4061 case hstatus_unusable:
4062 expired = FALSE;
4063 setflag(addrlist, af_retry_skipped);
4064 /* Fall through */
4065
4066 case hstatus_unusable_expired:
4067 switch (host->why)
4068 {
4069 case hwhy_retry: hosts_retry++; break;
4070 case hwhy_failed: hosts_fail++; break;
4071 case hwhy_insecure:
4072 case hwhy_deferred: hosts_defer++; break;
4073 }
4074
4075 /* If there was a retry message key, implying that previously there
4076 was a message-specific defer, we don't want to update the list of
4077 messages waiting for these hosts. */
4078
4079 if (retry_message_key) update_waiting = FALSE;
4080 continue; /* With the next host or IP address */
4081 }
4082 }
4083
4084 /* Second time round the loop: if the address is set but expired, and
4085 the message is newer than the last try, let it through. */
4086
4087 else
4088 {
4089 if ( !host->address
4090 || host->status != hstatus_unusable_expired
4091 || host->last_try > received_time)
4092 continue;
4093 DEBUG(D_transport) debug_printf("trying expired host %s [%s]%s\n",
4094 host->name, host->address, pistring);
4095 host_is_expired = TRUE;
4096 }
4097
4098 /* Setting "expired=FALSE" doesn't actually mean not all hosts are expired;
4099 it remains TRUE only if all hosts are expired and none are actually tried.
4100 */
4101
4102 expired = FALSE;
4103
4104 /* If this host is listed as one to which access must be serialized,
4105 see if another Exim process has a connection to it, and if so, skip
4106 this host. If not, update the database to record our connection to it
4107 and remember this for later deletion. Do not do any of this if we are
4108 sending the message down a pre-existing connection. */
4109
4110 if ( !continue_hostname
4111 && verify_check_given_host(&ob->serialize_hosts, host) == OK)
4112 {
4113 serialize_key = string_sprintf("host-serialize-%s", host->name);
4114 if (!enq_start(serialize_key, 1))
4115 {
4116 DEBUG(D_transport)
4117 debug_printf("skipping host %s because another Exim process "
4118 "is connected to it\n", host->name);
4119 hosts_serial++;
4120 continue;
4121 }
4122 }
4123
4124 /* OK, we have an IP address that is not waiting for its retry time to
4125 arrive (it might be expired) OR (second time round the loop) we have an
4126 expired host that hasn't been tried since the message arrived. Have a go
4127 at delivering the message to it. First prepare the addresses by flushing
4128 out the result of previous attempts, and finding the first address that
4129 is still to be delivered. */
4130
4131 first_addr = prepare_addresses(addrlist, host);
4132
4133 DEBUG(D_transport) debug_printf("delivering %s to %s [%s] (%s%s)\n",
4134 message_id, host->name, host->address, addrlist->address,
4135 addrlist->next ? ", ..." : "");
4136
4137 set_process_info("delivering %s to %s [%s] (%s%s)",
4138 message_id, host->name, host->address, addrlist->address,
4139 addrlist->next ? ", ..." : "");
4140
4141 /* This is not for real; don't do the delivery. If there are
4142 any remaining hosts, list them. */
4143
4144 if (dont_deliver)
4145 {
4146 host_item *host2;
4147 set_errno_nohost(addrlist, 0, NULL, OK, FALSE);
4148 for (addr = addrlist; addr; addr = addr->next)
4149 {
4150 addr->host_used = host;
4151 addr->special_action = '*';
4152 addr->message = US"delivery bypassed by -N option";
4153 }
4154 DEBUG(D_transport)
4155 {
4156 debug_printf("*** delivery by %s transport bypassed by -N option\n"
4157 "*** host and remaining hosts:\n", tblock->name);
4158 for (host2 = host; host2; host2 = host2->next)
4159 debug_printf(" %s [%s]\n", host2->name,
4160 host2->address ? host2->address : US"unset");
4161 }
4162 rc = OK;
4163 }
4164
4165 /* This is for real. If the host is expired, we don't count it for
4166 hosts_max_retry. This ensures that all hosts must expire before an address
4167 is timed out, unless hosts_max_try_hardlimit (which protects against
4168 lunatic DNS configurations) is reached.
4169
4170 If the host is not expired and we are about to hit the hosts_max_retry
4171 limit, check to see if there is a subsequent hosts with a different MX
4172 value. If so, make that the next host, and don't count this one. This is a
4173 heuristic to make sure that different MXs do get tried. With a normal kind
4174 of retry rule, they would get tried anyway when the earlier hosts were
4175 delayed, but if the domain has a "retry every time" type of rule - as is
4176 often used for the the very large ISPs, that won't happen. */
4177
4178 else
4179 {
4180 host_item * thost;
4181 /* Make a copy of the host if it is local to this invocation
4182 of the transport. */
4183
4184 if (expanded_hosts)
4185 {
4186 thost = store_get(sizeof(host_item));
4187 *thost = *host;
4188 thost->name = string_copy(host->name);
4189 thost->address = string_copy(host->address);
4190 }
4191 else
4192 thost = host;
4193
4194 if (!host_is_expired && ++unexpired_hosts_tried >= ob->hosts_max_try)
4195 {
4196 host_item *h;
4197 DEBUG(D_transport)
4198 debug_printf("hosts_max_try limit reached with this host\n");
4199 for (h = host; h; h = h->next) if (h->mx != host->mx)
4200 {
4201 nexthost = h;
4202 unexpired_hosts_tried--;
4203 DEBUG(D_transport) debug_printf("however, a higher MX host exists "
4204 "and will be tried\n");
4205 break;
4206 }
4207 }
4208
4209 /* Attempt the delivery. */
4210
4211 total_hosts_tried++;
4212 rc = smtp_deliver(addrlist, thost, host_af, port, interface, tblock,
4213 &message_defer, FALSE);
4214
4215 /* Yield is one of:
4216 OK => connection made, each address contains its result;
4217 message_defer is set for message-specific defers (when all
4218 recipients are marked defer)
4219 DEFER => there was a non-message-specific delivery problem;
4220 ERROR => there was a problem setting up the arguments for a filter,
4221 or there was a problem with expanding added headers
4222 */
4223
4224 /* If the result is not OK, there was a non-message-specific problem.
4225 If the result is DEFER, we need to write to the logs saying what happened
4226 for this particular host, except in the case of authentication and TLS
4227 failures, where the log has already been written. If all hosts defer a
4228 general message is written at the end. */
4229
4230 if (rc == DEFER && first_addr->basic_errno != ERRNO_AUTHFAIL
4231 && first_addr->basic_errno != ERRNO_TLSFAILURE)
4232 write_logs(first_addr, host);
4233
4234 #ifndef DISABLE_EVENT
4235 if (rc == DEFER)
4236 deferred_event_raise(first_addr, host);
4237 #endif
4238
4239 /* If STARTTLS was accepted, but there was a failure in setting up the
4240 TLS session (usually a certificate screwup), and the host is not in
4241 hosts_require_tls, and tls_tempfail_tryclear is true, try again, with
4242 TLS forcibly turned off. We have to start from scratch with a new SMTP
4243 connection. That's why the retry is done from here, not from within
4244 smtp_deliver(). [Rejections of STARTTLS itself don't screw up the
4245 session, so the in-clear transmission after those errors, if permitted,
4246 happens inside smtp_deliver().] */
4247
4248 #ifdef SUPPORT_TLS
4249 if ( rc == DEFER
4250 && first_addr->basic_errno == ERRNO_TLSFAILURE
4251 && ob->tls_tempfail_tryclear
4252 && verify_check_given_host(&ob->hosts_require_tls, host) != OK
4253 )
4254 {
4255 log_write(0, LOG_MAIN,
4256 "%s: delivering unencrypted to H=%s [%s] (not in hosts_require_tls)",
4257 first_addr->message, host->name, host->address);
4258 first_addr = prepare_addresses(addrlist, host);
4259 rc = smtp_deliver(addrlist, thost, host_af, port, interface, tblock,
4260 &message_defer, TRUE);
4261 if (rc == DEFER && first_addr->basic_errno != ERRNO_AUTHFAIL)
4262 write_logs(first_addr, host);
4263 # ifndef DISABLE_EVENT
4264 if (rc == DEFER)
4265 deferred_event_raise(first_addr, host);
4266 # endif
4267 }
4268 #endif /*SUPPORT_TLS*/
4269 }
4270
4271 /* Delivery attempt finished */
4272
4273 rs = rc == OK ? US"OK"
4274 : rc == DEFER ? US"DEFER"
4275 : rc == ERROR ? US"ERROR"
4276 : US"?";
4277
4278 set_process_info("delivering %s: just tried %s [%s] for %s%s: result %s",
4279 message_id, host->name, host->address, addrlist->address,
4280 addrlist->next ? " (& others)" : "", rs);
4281
4282 /* Release serialization if set up */
4283
4284 if (serialize_key) enq_end(serialize_key);
4285
4286 /* If the result is DEFER, or if a host retry record is known to exist, we
4287 need to add an item to the retry chain for updating the retry database
4288 at the end of delivery. We only need to add the item to the top address,
4289 of course. Also, if DEFER, we mark the IP address unusable so as to skip it
4290 for any other delivery attempts using the same address. (It is copied into
4291 the unusable tree at the outer level, so even if different address blocks
4292 contain the same address, it still won't get tried again.) */
4293
4294 if (rc == DEFER || retry_host_key)
4295 {
4296 int delete_flag = rc != DEFER ? rf_delete : 0;
4297 if (!retry_host_key)
4298 {
4299 BOOL incl_ip;
4300 if (exp_bool(addrlist, US"transport", tblock->name, D_transport,
4301 US"retry_include_ip_address", ob->retry_include_ip_address,
4302 ob->expand_retry_include_ip_address, &incl_ip) != OK)
4303 incl_ip = TRUE; /* error; use most-specific retry record */
4304
4305 retry_host_key = incl_ip
4306 ? string_sprintf("T:%S:%s%s", host->name, host->address, pistring)
4307 : string_sprintf("T:%S%s", host->name, pistring);
4308 }
4309
4310 /* If a delivery of another message over an existing SMTP connection
4311 yields DEFER, we do NOT set up retry data for the host. This covers the
4312 case when there are delays in routing the addresses in the second message
4313 that are so long that the server times out. This is alleviated by not
4314 routing addresses that previously had routing defers when handling an
4315 existing connection, but even so, this case may occur (e.g. if a
4316 previously happily routed address starts giving routing defers). If the
4317 host is genuinely down, another non-continued message delivery will
4318 notice it soon enough. */
4319
4320 if (delete_flag != 0 || !continue_hostname)
4321 retry_add_item(first_addr, retry_host_key, rf_host | delete_flag);
4322
4323 /* We may have tried an expired host, if its retry time has come; ensure
4324 the status reflects the expiry for the benefit of any other addresses. */
4325
4326 if (rc == DEFER)
4327 {
4328 host->status = host_is_expired
4329 ? hstatus_unusable_expired : hstatus_unusable;
4330 host->why = hwhy_deferred;
4331 }
4332 }
4333
4334 /* If message_defer is set (host was OK, but every recipient got deferred
4335 because of some message-specific problem), or if that had happened
4336 previously so that a message retry key exists, add an appropriate item
4337 to the retry chain. Note that if there was a message defer but now there is
4338 a host defer, the message defer record gets deleted. That seems perfectly
4339 reasonable. Also, stop the message from being remembered as waiting
4340 for specific hosts. */
4341
4342 if (message_defer || retry_message_key)
4343 {
4344 int delete_flag = message_defer ? 0 : rf_delete;
4345 if (!retry_message_key)
4346 {
4347 BOOL incl_ip;
4348 if (exp_bool(addrlist, US"transport", tblock->name, D_transport,
4349 US"retry_include_ip_address", ob->retry_include_ip_address,
4350 ob->expand_retry_include_ip_address, &incl_ip) != OK)
4351 incl_ip = TRUE; /* error; use most-specific retry record */
4352
4353 retry_message_key = incl_ip
4354 ? string_sprintf("T:%S:%s%s:%s", host->name, host->address, pistring,
4355 message_id)
4356 : string_sprintf("T:%S%s:%s", host->name, pistring, message_id);
4357 }
4358 retry_add_item(addrlist, retry_message_key,
4359 rf_message | rf_host | delete_flag);
4360 update_waiting = FALSE;
4361 }
4362
4363 /* Any return other than DEFER (that is, OK or ERROR) means that the
4364 addresses have got their final statuses filled in for this host. In the OK
4365 case, see if any of them are deferred. */
4366
4367 if (rc == OK)
4368 for (addr = addrlist; addr; addr = addr->next)
4369 if (addr->transport_return == DEFER)
4370 {
4371 some_deferred = TRUE;
4372 break;
4373 }
4374
4375 /* If no addresses deferred or the result was ERROR, return. We do this for
4376 ERROR because a failing filter set-up or add_headers expansion is likely to
4377 fail for any host we try. */
4378
4379 if (rc == ERROR || (rc == OK && !some_deferred))
4380 {
4381 DEBUG(D_transport) debug_printf("Leaving %s transport\n", tblock->name);
4382 return TRUE; /* Each address has its status */
4383 }
4384
4385 /* If the result was DEFER or some individual addresses deferred, let
4386 the loop run to try other hosts with the deferred addresses, except for the
4387 case when we were trying to deliver down an existing channel and failed.
4388 Don't try any other hosts in this case. */
4389
4390 if (continue_hostname) break;
4391
4392 /* If the whole delivery, or some individual addresses, were deferred and
4393 there are more hosts that could be tried, do not count this host towards
4394 the hosts_max_try limit if the age of the message is greater than the
4395 maximum retry time for this host. This means we may try try all hosts,
4396 ignoring the limit, when messages have been around for some time. This is
4397 important because if we don't try all hosts, the address will never time
4398 out. NOTE: this does not apply to hosts_max_try_hardlimit. */
4399
4400 if ((rc == DEFER || some_deferred) && nexthost)
4401 {
4402 BOOL timedout;
4403 retry_config *retry = retry_find_config(host->name, NULL, 0, 0);
4404
4405 if (retry && retry->rules)
4406 {
4407 retry_rule *last_rule;
4408 for (last_rule = retry->rules;
4409 last_rule->next;
4410 last_rule = last_rule->next);
4411 timedout = time(NULL) - received_time > last_rule->timeout;
4412 }
4413 else timedout = TRUE; /* No rule => timed out */
4414
4415 if (timedout)
4416 {
4417 unexpired_hosts_tried--;
4418 DEBUG(D_transport) debug_printf("temporary delivery error(s) override "
4419 "hosts_max_try (message older than host's retry time)\n");
4420 }
4421 }
4422 } /* End of loop for trying multiple hosts. */
4423
4424 /* This is the end of the loop that repeats iff expired is TRUE and
4425 ob->delay_after_cutoff is FALSE. The second time round we will
4426 try those hosts that haven't been tried since the message arrived. */
4427
4428 DEBUG(D_transport)
4429 {
4430 debug_printf("all IP addresses skipped or deferred at least one address\n");
4431 if (expired && !ob->delay_after_cutoff && cutoff_retry == 0)
4432 debug_printf("retrying IP addresses not tried since message arrived\n");
4433 }
4434 }
4435
4436
4437 /* Get here if all IP addresses are skipped or defer at least one address. In
4438 MUA wrapper mode, this will happen only for connection or other non-message-
4439 specific failures. Force the delivery status for all addresses to FAIL. */
4440
4441 if (mua_wrapper)
4442 {
4443 for (addr = addrlist; addr; addr = addr->next)
4444 addr->transport_return = FAIL;
4445 goto END_TRANSPORT;
4446 }
4447
4448 /* In the normal, non-wrapper case, add a standard message to each deferred
4449 address if there hasn't been an error, that is, if it hasn't actually been
4450 tried this time. The variable "expired" will be FALSE if any deliveries were
4451 actually tried, or if there was at least one host that was not expired. That
4452 is, it is TRUE only if no deliveries were tried and all hosts were expired. If
4453 a delivery has been tried, an error code will be set, and the failing of the
4454 message is handled by the retry code later.
4455
4456 If queue_smtp is set, or this transport was called to send a subsequent message
4457 down an existing TCP/IP connection, and something caused the host not to be
4458 found, we end up here, but can detect these cases and handle them specially. */
4459
4460 for (addr = addrlist; addr; addr = addr->next)
4461 {
4462 /* If host is not NULL, it means that we stopped processing the host list
4463 because of hosts_max_try or hosts_max_try_hardlimit. In the former case, this
4464 means we need to behave as if some hosts were skipped because their retry
4465 time had not come. Specifically, this prevents the address from timing out.
4466 However, if we have hit hosts_max_try_hardlimit, we want to behave as if all
4467 hosts were tried. */
4468
4469 if (host)
4470 if (total_hosts_tried >= ob->hosts_max_try_hardlimit)
4471 {
4472 DEBUG(D_transport)
4473 debug_printf("hosts_max_try_hardlimit reached: behave as if all "
4474 "hosts were tried\n");
4475 }
4476 else
4477 {
4478 DEBUG(D_transport)
4479 debug_printf("hosts_max_try limit caused some hosts to be skipped\n");
4480 setflag(addr, af_retry_skipped);
4481 }
4482
4483 if (queue_smtp) /* no deliveries attempted */
4484 {
4485 addr->transport_return = DEFER;
4486 addr->basic_errno = 0;
4487 addr->message = US"SMTP delivery explicitly queued";
4488 }
4489
4490 else if ( addr->transport_return == DEFER
4491 && (addr->basic_errno == ERRNO_UNKNOWNERROR || addr->basic_errno == 0)
4492 && !addr->message
4493 )
4494 {
4495 addr->basic_errno = ERRNO_HRETRY;
4496 if (continue_hostname)
4497 addr->message = US"no host found for existing SMTP connection";
4498 else if (expired)
4499 {
4500 setflag(addr, af_pass_message); /* This is not a security risk */
4501 addr->message = string_sprintf(
4502 "all hosts%s have been failing for a long time %s",
4503 addr->domain ? string_sprintf(" for '%s'", addr->domain) : US"",
4504 ob->delay_after_cutoff
4505 ? US"(and retry time not reached)"
4506 : US"and were last tried after this message arrived");
4507
4508 /* If we are already using fallback hosts, or there are no fallback hosts
4509 defined, convert the result to FAIL to cause a bounce. */
4510
4511 if (addr->host_list == addr->fallback_hosts || !addr->fallback_hosts)
4512 addr->transport_return = FAIL;
4513 }
4514 else
4515 {
4516 const char * s;
4517 if (hosts_retry == hosts_total)
4518 s = "retry time not reached for any host%s";
4519 else if (hosts_fail == hosts_total)
4520 s = "all host address lookups%s failed permanently";
4521 else if (hosts_defer == hosts_total)
4522 s = "all host address lookups%s failed temporarily";
4523 else if (hosts_serial == hosts_total)
4524 s = "connection limit reached for all hosts%s";
4525 else if (hosts_fail+hosts_defer == hosts_total)
4526 s = "all host address lookups%s failed";
4527 else
4528 s = "some host address lookups failed and retry time "
4529 "not reached for other hosts or connection limit reached%s";
4530
4531 addr->message = string_sprintf(s,
4532 addr->domain ? string_sprintf(" for '%s'", addr->domain) : US"");
4533 }
4534 }
4535 }
4536
4537 /* Update the database which keeps information about which messages are waiting
4538 for which hosts to become available. For some message-specific errors, the
4539 update_waiting flag is turned off because we don't want follow-on deliveries in
4540 those cases. If this transport instance is explicitly limited to one message
4541 per connection then follow-on deliveries are not possible and there's no need
4542 to create/update the per-transport wait-<transport_name> database. */
4543
4544 if (update_waiting && tblock->connection_max_messages != 1)
4545 transport_update_waiting(hostlist, tblock->name);
4546
4547 END_TRANSPORT:
4548
4549 DEBUG(D_transport) debug_printf("Leaving %s transport\n", tblock->name);
4550
4551 return TRUE; /* Each address has its status */
4552 }
4553
4554 /* vi: aw ai sw=2
4555 */
4556 /* End of transport/smtp.c */
Unnamed repository; edit this file 'description' to name the repository.