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