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[exim.git] / src / src / transports / smtp.c
1 /*************************************************
2 * Exim - an Internet mail transport agent *
3 *************************************************/
4
5 /* Copyright (c) University of Cambridge 1995 - 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. If not reaping responses, note that
1376 there may be more writes (like, the chunk data) done soon. */
1377
1378 if (chunk_size > 0)
1379 {
1380 if((cmd_count = smtp_write_command(&sx->outblock,
1381 flags & tc_reap_prev ? SCMD_FLUSH : SCMD_MORE,
1382 "BDAT %u%s\r\n", chunk_size, flags & tc_chunk_last ? " LAST" : "")
1383 ) < 0) return ERROR;
1384 if (flags & tc_chunk_last)
1385 data_command = string_copy(big_buffer); /* Save for later error message */
1386 }
1387
1388 prev_cmd_count = cmd_count += sx->cmd_count;
1389
1390 /* Reap responses for any previous, but not one we just emitted */
1391
1392 if (chunk_size > 0)
1393 prev_cmd_count--;
1394 if (sx->pending_BDAT)
1395 prev_cmd_count--;
1396
1397 if (flags & tc_reap_prev && prev_cmd_count > 0)
1398 {
1399 DEBUG(D_transport) debug_printf("look for %d responses"
1400 " for previous pipelined cmds\n", prev_cmd_count);
1401
1402 switch(sync_responses(sx, prev_cmd_count, 0))
1403 {
1404 case 1: /* 2xx (only) => OK */
1405 case 3: sx->good_RCPT = TRUE; /* 2xx & 5xx => OK & progress made */
1406 case 2: sx->completed_addr = TRUE; /* 5xx (only) => progress made */
1407 case 0: break; /* No 2xx or 5xx, but no probs */
1408
1409 case -1: /* Timeout on RCPT */
1410 default: return ERROR; /* I/O error, or any MAIL/DATA error */
1411 }
1412 cmd_count = 1;
1413 if (!sx->pending_BDAT)
1414 pipelining_active = FALSE;
1415 }
1416
1417 /* Reap response for an outstanding BDAT */
1418
1419 if (sx->pending_BDAT)
1420 {
1421 DEBUG(D_transport) debug_printf("look for one response for BDAT\n");
1422
1423 if (!smtp_read_response(&sx->inblock, sx->buffer, sizeof(sx->buffer), '2',
1424 ob->command_timeout))
1425 {
1426 if (errno == 0 && sx->buffer[0] == '4')
1427 {
1428 errno = ERRNO_DATA4XX; /*XXX does this actually get used? */
1429 sx->addrlist->more_errno |=
1430 ((sx->buffer[1] - '0')*10 + sx->buffer[2] - '0') << 8;
1431 }
1432 return ERROR;
1433 }
1434 cmd_count--;
1435 sx->pending_BDAT = FALSE;
1436 pipelining_active = FALSE;
1437 }
1438 else if (chunk_size > 0)
1439 sx->pending_BDAT = TRUE;
1440
1441
1442 sx->cmd_count = cmd_count;
1443 return OK;
1444 }
1445
1446
1447
1448 /*************************************************
1449 * Make connection for given message *
1450 *************************************************/
1451
1452 /*
1453 Arguments:
1454 ctx connection context
1455 suppress_tls if TRUE, don't attempt a TLS connection - this is set for
1456 a second attempt after TLS initialization fails
1457
1458 Returns: OK - the connection was made and the delivery attempted;
1459 fd is set in the conn context, tls_out set up.
1460 DEFER - the connection could not be made, or something failed
1461 while setting up the SMTP session, or there was a
1462 non-message-specific error, such as a timeout.
1463 ERROR - helo_data or add_headers or authenticated_sender is
1464 specified for this transport, and the string failed
1465 to expand
1466 */
1467 int
1468 smtp_setup_conn(smtp_context * sx, BOOL suppress_tls)
1469 {
1470 #if defined(SUPPORT_TLS) && defined(EXPERIMENTAL_DANE)
1471 dns_answer tlsa_dnsa;
1472 #endif
1473 BOOL pass_message = FALSE;
1474 uschar * message = NULL;
1475 int yield = OK;
1476 int rc;
1477
1478 sx->ob = (smtp_transport_options_block *) sx->tblock->options_block;
1479
1480 sx->lmtp = strcmpic(sx->ob->protocol, US"lmtp") == 0;
1481 sx->smtps = strcmpic(sx->ob->protocol, US"smtps") == 0;
1482 sx->ok = FALSE;
1483 sx->send_rset = TRUE;
1484 sx->send_quit = TRUE;
1485 sx->setting_up = TRUE;
1486 sx->esmtp = TRUE;
1487 sx->esmtp_sent = FALSE;
1488 #ifdef SUPPORT_I18N
1489 sx->utf8_needed = FALSE;
1490 #endif
1491 sx->dsn_all_lasthop = TRUE;
1492 #if defined(SUPPORT_TLS) && defined(EXPERIMENTAL_DANE)
1493 sx->dane = FALSE;
1494 sx->dane_required = verify_check_given_host(&sx->ob->hosts_require_dane, sx->host) == OK;
1495 #endif
1496
1497 if ((sx->max_rcpt = sx->tblock->max_addresses) == 0) sx->max_rcpt = 999999;
1498 sx->peer_offered = 0;
1499 sx->igquotstr = US"";
1500 if (!sx->helo_data) sx->helo_data = sx->ob->helo_data;
1501 #ifdef EXPERIMENTAL_DSN_INFO
1502 sx->smtp_greeting = NULL;
1503 sx->helo_response = NULL;
1504 #endif
1505
1506 smtp_command = US"initial connection";
1507 sx->buffer[0] = '\0';
1508
1509 /* Set up the buffer for reading SMTP response packets. */
1510
1511 sx->inblock.buffer = sx->inbuffer;
1512 sx->inblock.buffersize = sizeof(sx->inbuffer);
1513 sx->inblock.ptr = sx->inbuffer;
1514 sx->inblock.ptrend = sx->inbuffer;
1515
1516 /* Set up the buffer for holding SMTP commands while pipelining */
1517
1518 sx->outblock.buffer = sx->outbuffer;
1519 sx->outblock.buffersize = sizeof(sx->outbuffer);
1520 sx->outblock.ptr = sx->outbuffer;
1521 sx->outblock.cmd_count = 0;
1522 sx->outblock.authenticating = FALSE;
1523
1524 /* Reset the parameters of a TLS session. */
1525
1526 tls_out.bits = 0;
1527 tls_out.cipher = NULL; /* the one we may use for this transport */
1528 tls_out.ourcert = NULL;
1529 tls_out.peercert = NULL;
1530 tls_out.peerdn = NULL;
1531 #if defined(SUPPORT_TLS) && !defined(USE_GNUTLS)
1532 tls_out.sni = NULL;
1533 #endif
1534 tls_out.ocsp = OCSP_NOT_REQ;
1535
1536 /* Flip the legacy TLS-related variables over to the outbound set in case
1537 they're used in the context of the transport. Don't bother resetting
1538 afterward (when being used by a transport) as we're in a subprocess.
1539 For verify, unflipped once the callout is dealt with */
1540
1541 tls_modify_variables(&tls_out);
1542
1543 #ifndef SUPPORT_TLS
1544 if (sx->smtps)
1545 {
1546 set_errno_nohost(sx->addrlist, ERRNO_TLSFAILURE, US"TLS support not available",
1547 DEFER, FALSE);
1548 return ERROR;
1549 }
1550 #endif
1551
1552 /* Make a connection to the host if this isn't a continued delivery, and handle
1553 the initial interaction and HELO/EHLO/LHLO. Connect timeout errors are handled
1554 specially so they can be identified for retries. */
1555
1556 if (continue_hostname == NULL)
1557 {
1558 if (sx->verify)
1559 HDEBUG(D_verify) debug_printf("interface=%s port=%d\n", sx->interface, sx->port);
1560
1561 /* This puts port into host->port */
1562 sx->inblock.sock = sx->outblock.sock =
1563 smtp_connect(sx->host, sx->host_af, sx->port, sx->interface,
1564 sx->ob->connect_timeout, sx->tblock);
1565
1566 if (sx->inblock.sock < 0)
1567 {
1568 uschar * msg = NULL;
1569 if (sx->verify)
1570 {
1571 msg = US strerror(errno);
1572 HDEBUG(D_verify) debug_printf("connect: %s\n", msg);
1573 }
1574 set_errno_nohost(sx->addrlist,
1575 errno == ETIMEDOUT ? ERRNO_CONNECTTIMEOUT : errno,
1576 sx->verify ? string_sprintf("could not connect: %s", msg)
1577 : NULL,
1578 DEFER, FALSE);
1579 sx->send_quit = FALSE;
1580 return DEFER;
1581 }
1582
1583 #if defined(SUPPORT_TLS) && defined(EXPERIMENTAL_DANE)
1584 {
1585 tls_out.dane_verified = FALSE;
1586 tls_out.tlsa_usage = 0;
1587
1588 if (sx->host->dnssec == DS_YES)
1589 {
1590 if( sx->dane_required
1591 || verify_check_given_host(&sx->ob->hosts_try_dane, sx->host) == OK
1592 )
1593 switch (rc = tlsa_lookup(sx->host, &tlsa_dnsa, sx->dane_required))
1594 {
1595 case OK: sx->dane = TRUE; break;
1596 case FAIL_FORCED: break;
1597 default: set_errno_nohost(sx->addrlist, ERRNO_DNSDEFER,
1598 string_sprintf("DANE error: tlsa lookup %s",
1599 rc == DEFER ? "DEFER" : "FAIL"),
1600 rc, FALSE);
1601 return rc;
1602 }
1603 }
1604 else if (sx->dane_required)
1605 {
1606 set_errno_nohost(sx->addrlist, ERRNO_DNSDEFER,
1607 string_sprintf("DANE error: %s lookup not DNSSEC", sx->host->name),
1608 FAIL, FALSE);
1609 return FAIL;
1610 }
1611
1612 if (sx->dane)
1613 sx->ob->tls_tempfail_tryclear = FALSE;
1614 }
1615 #endif /*DANE*/
1616
1617 /* Expand the greeting message while waiting for the initial response. (Makes
1618 sense if helo_data contains ${lookup dnsdb ...} stuff). The expansion is
1619 delayed till here so that $sending_interface and $sending_port are set. */
1620
1621 if (sx->helo_data)
1622 if (!(sx->helo_data = expand_string(sx->helo_data)))
1623 if (sx->verify)
1624 log_write(0, LOG_MAIN|LOG_PANIC,
1625 "<%s>: failed to expand transport's helo_data value for callout: %s",
1626 sx->addrlist->address, expand_string_message);
1627
1628 #ifdef SUPPORT_I18N
1629 if (sx->helo_data)
1630 {
1631 expand_string_message = NULL;
1632 if ((sx->helo_data = string_domain_utf8_to_alabel(sx->helo_data,
1633 &expand_string_message)),
1634 expand_string_message)
1635 if (sx->verify)
1636 log_write(0, LOG_MAIN|LOG_PANIC,
1637 "<%s>: failed to expand transport's helo_data value for callout: %s",
1638 sx->addrlist->address, expand_string_message);
1639 else
1640 sx->helo_data = NULL;
1641 }
1642 #endif
1643
1644 /* The first thing is to wait for an initial OK response. The dreaded "goto"
1645 is nevertheless a reasonably clean way of programming this kind of logic,
1646 where you want to escape on any error. */
1647
1648 if (!sx->smtps)
1649 {
1650 BOOL good_response;
1651
1652 #ifdef TCP_QUICKACK
1653 (void) setsockopt(sx->inblock.sock, IPPROTO_TCP, TCP_QUICKACK, US &off, sizeof(off));
1654 #endif
1655 good_response = smtp_read_response(&sx->inblock, sx->buffer, sizeof(sx->buffer),
1656 '2', sx->ob->command_timeout);
1657 #ifdef EXPERIMENTAL_DSN_INFO
1658 sx->smtp_greeting = string_copy(sx->buffer);
1659 #endif
1660 if (!good_response) goto RESPONSE_FAILED;
1661
1662 #ifndef DISABLE_EVENT
1663 {
1664 uschar * s;
1665 lookup_dnssec_authenticated = sx->host->dnssec==DS_YES ? US"yes"
1666 : sx->host->dnssec==DS_NO ? US"no" : NULL;
1667 s = event_raise(sx->tblock->event_action, US"smtp:connect", sx->buffer);
1668 if (s)
1669 {
1670 set_errno_nohost(sx->addrlist, ERRNO_EXPANDFAIL,
1671 string_sprintf("deferred by smtp:connect event expansion: %s", s),
1672 DEFER, FALSE);
1673 yield = DEFER;
1674 goto SEND_QUIT;
1675 }
1676 }
1677 #endif
1678
1679 /* Now check if the helo_data expansion went well, and sign off cleanly if
1680 it didn't. */
1681
1682 if (!sx->helo_data)
1683 {
1684 message = string_sprintf("failed to expand helo_data: %s",
1685 expand_string_message);
1686 set_errno_nohost(sx->addrlist, ERRNO_EXPANDFAIL, message, DEFER, FALSE);
1687 yield = DEFER;
1688 goto SEND_QUIT;
1689 }
1690 }
1691
1692 /** Debugging without sending a message
1693 sx->addrlist->transport_return = DEFER;
1694 goto SEND_QUIT;
1695 **/
1696
1697 /* Errors that occur after this point follow an SMTP command, which is
1698 left in big_buffer by smtp_write_command() for use in error messages. */
1699
1700 smtp_command = big_buffer;
1701
1702 /* Tell the remote who we are...
1703
1704 February 1998: A convention has evolved that ESMTP-speaking MTAs include the
1705 string "ESMTP" in their greeting lines, so make Exim send EHLO if the
1706 greeting is of this form. The assumption was that the far end supports it
1707 properly... but experience shows that there are some that give 5xx responses,
1708 even though the banner includes "ESMTP" (there's a bloody-minded one that
1709 says "ESMTP not spoken here"). Cope with that case.
1710
1711 September 2000: Time has passed, and it seems reasonable now to always send
1712 EHLO at the start. It is also convenient to make the change while installing
1713 the TLS stuff.
1714
1715 July 2003: Joachim Wieland met a broken server that advertises "PIPELINING"
1716 but times out after sending MAIL FROM, RCPT TO and DATA all together. There
1717 would be no way to send out the mails, so there is now a host list
1718 "hosts_avoid_esmtp" that disables ESMTP for special hosts and solves the
1719 PIPELINING problem as well. Maybe it can also be useful to cure other
1720 problems with broken servers.
1721
1722 Exim originally sent "Helo" at this point and ran for nearly a year that way.
1723 Then somebody tried it with a Microsoft mailer... It seems that all other
1724 mailers use upper case for some reason (the RFC is quite clear about case
1725 independence) so, for peace of mind, I gave in. */
1726
1727 sx->esmtp = verify_check_given_host(&sx->ob->hosts_avoid_esmtp, sx->host) != OK;
1728
1729 /* Alas; be careful, since this goto is not an error-out, so conceivably
1730 we might set data between here and the target which we assume to exist
1731 and be usable. I can see this coming back to bite us. */
1732 #ifdef SUPPORT_TLS
1733 if (sx->smtps)
1734 {
1735 smtp_peer_options |= PEER_OFFERED_TLS;
1736 suppress_tls = FALSE;
1737 sx->ob->tls_tempfail_tryclear = FALSE;
1738 smtp_command = US"SSL-on-connect";
1739 goto TLS_NEGOTIATE;
1740 }
1741 #endif
1742
1743 if (sx->esmtp)
1744 {
1745 if (smtp_write_command(&sx->outblock, SCMD_FLUSH, "%s %s\r\n",
1746 sx->lmtp ? "LHLO" : "EHLO", sx->helo_data) < 0)
1747 goto SEND_FAILED;
1748 sx->esmtp_sent = TRUE;
1749 if (!smtp_read_response(&sx->inblock, sx->buffer, sizeof(sx->buffer), '2',
1750 sx->ob->command_timeout))
1751 {
1752 if (errno != 0 || sx->buffer[0] == 0 || sx->lmtp)
1753 {
1754 #ifdef EXPERIMENTAL_DSN_INFO
1755 sx->helo_response = string_copy(sx->buffer);
1756 #endif
1757 goto RESPONSE_FAILED;
1758 }
1759 sx->esmtp = FALSE;
1760 }
1761 #ifdef EXPERIMENTAL_DSN_INFO
1762 sx->helo_response = string_copy(sx->buffer);
1763 #endif
1764 }
1765 else
1766 DEBUG(D_transport)
1767 debug_printf("not sending EHLO (host matches hosts_avoid_esmtp)\n");
1768
1769 if (!sx->esmtp)
1770 {
1771 BOOL good_response;
1772 int n = sizeof(sx->buffer);
1773 uschar * rsp = sx->buffer;
1774
1775 if (sx->esmtp_sent && (n = Ustrlen(sx->buffer)) < sizeof(sx->buffer)/2)
1776 { rsp = sx->buffer + n + 1; n = sizeof(sx->buffer) - n; }
1777
1778 if (smtp_write_command(&sx->outblock, SCMD_FLUSH, "HELO %s\r\n", sx->helo_data) < 0)
1779 goto SEND_FAILED;
1780 good_response = smtp_read_response(&sx->inblock, rsp, n,
1781 '2', sx->ob->command_timeout);
1782 #ifdef EXPERIMENTAL_DSN_INFO
1783 sx->helo_response = string_copy(rsp);
1784 #endif
1785 if (!good_response)
1786 {
1787 /* Handle special logging for a closed connection after HELO
1788 when had previously sent EHLO */
1789
1790 if (rsp != sx->buffer && rsp[0] == 0 && (errno == 0 || errno == ECONNRESET))
1791 {
1792 errno = ERRNO_SMTPCLOSED;
1793 goto EHLOHELO_FAILED;
1794 }
1795 Ustrncpy(sx->buffer, rsp, sizeof(sx->buffer)/2);
1796 goto RESPONSE_FAILED;
1797 }
1798 }
1799
1800 sx->peer_offered = smtp_peer_options = 0;
1801
1802 if (sx->esmtp || sx->lmtp)
1803 {
1804 sx->peer_offered = ehlo_response(sx->buffer,
1805 PEER_OFFERED_TLS /* others checked later */
1806 );
1807
1808 /* Set tls_offered if the response to EHLO specifies support for STARTTLS. */
1809
1810 #ifdef SUPPORT_TLS
1811 smtp_peer_options |= sx->peer_offered & PEER_OFFERED_TLS;
1812 #endif
1813 }
1814 }
1815
1816 /* For continuing deliveries down the same channel, having re-exec'd the socket
1817 is the standard input; for a socket held open from verify it is recorded
1818 in the cutthrough context block. Either way we don't need to redo EHLO here
1819 (but may need to do so for TLS - see below).
1820 Set up the pointer to where subsequent commands will be left, for
1821 error messages. Note that smtp_peer_options will have been
1822 set from the command line if they were set in the process that passed the
1823 connection on. */
1824
1825 /*XXX continue case needs to propagate DSN_INFO, prob. in deliver.c
1826 as the continue goes via transport_pass_socket() and doublefork and exec.
1827 It does not wait. Unclear how we keep separate host's responses
1828 separate - we could match up by host ip+port as a bodge. */
1829
1830 else
1831 {
1832 if (cutthrough.fd >= 0 && cutthrough.callout_hold_only)
1833 {
1834 sx->inblock.sock = sx->outblock.sock = cutthrough.fd;
1835 sx->host->port = sx->port = cutthrough.host.port;
1836 }
1837 else
1838 {
1839 sx->inblock.sock = sx->outblock.sock = 0; /* stdin */
1840 sx->host->port = sx->port; /* Record the port that was used */
1841 }
1842 smtp_command = big_buffer;
1843 sx->helo_data = NULL; /* ensure we re-expand ob->helo_data */
1844
1845 /* For a continued connection with TLS being proxied for us, or a
1846 held-open verify connection with TLS, nothing more to do. */
1847
1848 if ( continue_proxy_cipher
1849 || (cutthrough.fd >= 0 && cutthrough.callout_hold_only && cutthrough.is_tls)
1850 )
1851 {
1852 sx->peer_offered = smtp_peer_options;
1853 pipelining_active = !!(smtp_peer_options & PEER_OFFERED_PIPE);
1854 HDEBUG(D_transport) debug_printf("continued connection, %s TLS\n",
1855 continue_proxy_cipher ? "proxied" : "verify conn with");
1856 return OK;
1857 }
1858 HDEBUG(D_transport) debug_printf("continued connection, no TLS\n");
1859 }
1860
1861 /* If TLS is available on this connection, whether continued or not, attempt to
1862 start up a TLS session, unless the host is in hosts_avoid_tls. If successful,
1863 send another EHLO - the server may give a different answer in secure mode. We
1864 use a separate buffer for reading the response to STARTTLS so that if it is
1865 negative, the original EHLO data is available for subsequent analysis, should
1866 the client not be required to use TLS. If the response is bad, copy the buffer
1867 for error analysis. */
1868
1869 #ifdef SUPPORT_TLS
1870 if ( smtp_peer_options & PEER_OFFERED_TLS
1871 && !suppress_tls
1872 && verify_check_given_host(&sx->ob->hosts_avoid_tls, sx->host) != OK
1873 && ( !sx->verify
1874 || verify_check_given_host(&sx->ob->hosts_verify_avoid_tls, sx->host) != OK
1875 ) )
1876 {
1877 uschar buffer2[4096];
1878 if (smtp_write_command(&sx->outblock, SCMD_FLUSH, "STARTTLS\r\n") < 0)
1879 goto SEND_FAILED;
1880
1881 /* If there is an I/O error, transmission of this message is deferred. If
1882 there is a temporary rejection of STARRTLS and tls_tempfail_tryclear is
1883 false, we also defer. However, if there is a temporary rejection of STARTTLS
1884 and tls_tempfail_tryclear is true, or if there is an outright rejection of
1885 STARTTLS, we carry on. This means we will try to send the message in clear,
1886 unless the host is in hosts_require_tls (tested below). */
1887
1888 if (!smtp_read_response(&sx->inblock, buffer2, sizeof(buffer2), '2',
1889 sx->ob->command_timeout))
1890 {
1891 if ( errno != 0
1892 || buffer2[0] == 0
1893 || (buffer2[0] == '4' && !sx->ob->tls_tempfail_tryclear)
1894 )
1895 {
1896 Ustrncpy(sx->buffer, buffer2, sizeof(sx->buffer));
1897 sx->buffer[sizeof(sx->buffer)-1] = '\0';
1898 goto RESPONSE_FAILED;
1899 }
1900 }
1901
1902 /* STARTTLS accepted: try to negotiate a TLS session. */
1903
1904 else
1905 TLS_NEGOTIATE:
1906 {
1907 address_item * addr;
1908 uschar * errstr;
1909 int rc = tls_client_start(sx->inblock.sock, sx->host, sx->addrlist, sx->tblock,
1910 # ifdef EXPERIMENTAL_DANE
1911 sx->dane ? &tlsa_dnsa : NULL,
1912 # endif
1913 &errstr);
1914
1915 /* TLS negotiation failed; give an error. From outside, this function may
1916 be called again to try in clear on a new connection, if the options permit
1917 it for this host. */
1918
1919 if (rc != OK)
1920 {
1921 # ifdef EXPERIMENTAL_DANE
1922 if (sx->dane) log_write(0, LOG_MAIN,
1923 "DANE attempt failed; TLS connection to %s [%s]: %s",
1924 sx->host->name, sx->host->address, errstr);
1925 # endif
1926
1927 errno = ERRNO_TLSFAILURE;
1928 message = string_sprintf("TLS session: %s", errstr);
1929 sx->send_quit = FALSE;
1930 goto TLS_FAILED;
1931 }
1932
1933 /* TLS session is set up */
1934
1935 smtp_peer_options_wrap = smtp_peer_options;
1936 for (addr = sx->addrlist; addr; addr = addr->next)
1937 if (addr->transport_return == PENDING_DEFER)
1938 {
1939 addr->cipher = tls_out.cipher;
1940 addr->ourcert = tls_out.ourcert;
1941 addr->peercert = tls_out.peercert;
1942 addr->peerdn = tls_out.peerdn;
1943 addr->ocsp = tls_out.ocsp;
1944 }
1945 }
1946 }
1947
1948 /* if smtps, we'll have smtp_command set to something else; always safe to
1949 reset it here. */
1950 smtp_command = big_buffer;
1951
1952 /* If we started TLS, redo the EHLO/LHLO exchange over the secure channel. If
1953 helo_data is null, we are dealing with a connection that was passed from
1954 another process, and so we won't have expanded helo_data above. We have to
1955 expand it here. $sending_ip_address and $sending_port are set up right at the
1956 start of the Exim process (in exim.c). */
1957
1958 if (tls_out.active >= 0)
1959 {
1960 char *greeting_cmd;
1961 BOOL good_response;
1962
1963 if (!sx->helo_data && !(sx->helo_data = expand_string(sx->ob->helo_data)))
1964 {
1965 uschar *message = string_sprintf("failed to expand helo_data: %s",
1966 expand_string_message);
1967 set_errno_nohost(sx->addrlist, ERRNO_EXPANDFAIL, message, DEFER, FALSE);
1968 yield = DEFER;
1969 goto SEND_QUIT;
1970 }
1971
1972 /* For SMTPS we need to wait for the initial OK response. */
1973 if (sx->smtps)
1974 {
1975 good_response = smtp_read_response(&sx->inblock, sx->buffer, sizeof(sx->buffer),
1976 '2', sx->ob->command_timeout);
1977 #ifdef EXPERIMENTAL_DSN_INFO
1978 sx->smtp_greeting = string_copy(sx->buffer);
1979 #endif
1980 if (!good_response) goto RESPONSE_FAILED;
1981 }
1982
1983 if (sx->esmtp)
1984 greeting_cmd = "EHLO";
1985 else
1986 {
1987 greeting_cmd = "HELO";
1988 DEBUG(D_transport)
1989 debug_printf("not sending EHLO (host matches hosts_avoid_esmtp)\n");
1990 }
1991
1992 if (smtp_write_command(&sx->outblock, SCMD_FLUSH, "%s %s\r\n",
1993 sx->lmtp ? "LHLO" : greeting_cmd, sx->helo_data) < 0)
1994 goto SEND_FAILED;
1995 good_response = smtp_read_response(&sx->inblock, sx->buffer, sizeof(sx->buffer),
1996 '2', sx->ob->command_timeout);
1997 #ifdef EXPERIMENTAL_DSN_INFO
1998 sx->helo_response = string_copy(sx->buffer);
1999 #endif
2000 if (!good_response) goto RESPONSE_FAILED;
2001 smtp_peer_options = 0;
2002 }
2003
2004 /* If the host is required to use a secure channel, ensure that we
2005 have one. */
2006
2007 else if ( sx->smtps
2008 # ifdef EXPERIMENTAL_DANE
2009 || sx->dane
2010 # endif
2011 || verify_check_given_host(&sx->ob->hosts_require_tls, sx->host) == OK
2012 )
2013 {
2014 errno = ERRNO_TLSREQUIRED;
2015 message = string_sprintf("a TLS session is required, but %s",
2016 smtp_peer_options & PEER_OFFERED_TLS
2017 ? "an attempt to start TLS failed" : "the server did not offer TLS support");
2018 goto TLS_FAILED;
2019 }
2020 #endif /*SUPPORT_TLS*/
2021
2022 /* If TLS is active, we have just started it up and re-done the EHLO command,
2023 so its response needs to be analyzed. If TLS is not active and this is a
2024 continued session down a previously-used socket, we haven't just done EHLO, so
2025 we skip this. */
2026
2027 if (continue_hostname == NULL
2028 #ifdef SUPPORT_TLS
2029 || tls_out.active >= 0
2030 #endif
2031 )
2032 {
2033 if (sx->esmtp || sx->lmtp)
2034 {
2035 sx->peer_offered = ehlo_response(sx->buffer,
2036 0 /* no TLS */
2037 | (sx->lmtp && sx->ob->lmtp_ignore_quota ? PEER_OFFERED_IGNQ : 0)
2038 | PEER_OFFERED_CHUNKING
2039 | PEER_OFFERED_PRDR
2040 #ifdef SUPPORT_I18N
2041 | (sx->addrlist->prop.utf8_msg ? PEER_OFFERED_UTF8 : 0)
2042 /*XXX if we hand peercaps on to continued-conn processes,
2043 must not depend on this addr */
2044 #endif
2045 | PEER_OFFERED_DSN
2046 | PEER_OFFERED_PIPE
2047 | (sx->ob->size_addition >= 0 ? PEER_OFFERED_SIZE : 0)
2048 );
2049
2050 /* Set for IGNOREQUOTA if the response to LHLO specifies support and the
2051 lmtp_ignore_quota option was set. */
2052
2053 sx->igquotstr = sx->peer_offered & PEER_OFFERED_IGNQ ? US" IGNOREQUOTA" : US"";
2054
2055 /* If the response to EHLO specified support for the SIZE parameter, note
2056 this, provided size_addition is non-negative. */
2057
2058 smtp_peer_options |= sx->peer_offered & PEER_OFFERED_SIZE;
2059
2060 /* Note whether the server supports PIPELINING. If hosts_avoid_esmtp matched
2061 the current host, esmtp will be false, so PIPELINING can never be used. If
2062 the current host matches hosts_avoid_pipelining, don't do it. */
2063
2064 if ( sx->peer_offered & PEER_OFFERED_PIPE
2065 && verify_check_given_host(&sx->ob->hosts_avoid_pipelining, sx->host) != OK)
2066 smtp_peer_options |= PEER_OFFERED_PIPE;
2067
2068 DEBUG(D_transport) debug_printf("%susing PIPELINING\n",
2069 smtp_peer_options & PEER_OFFERED_PIPE ? "" : "not ");
2070
2071 if ( sx->peer_offered & PEER_OFFERED_CHUNKING
2072 && verify_check_given_host(&sx->ob->hosts_try_chunking, sx->host) != OK)
2073 sx->peer_offered &= ~PEER_OFFERED_CHUNKING;
2074
2075 if (sx->peer_offered & PEER_OFFERED_CHUNKING)
2076 {DEBUG(D_transport) debug_printf("CHUNKING usable\n");}
2077
2078 #ifndef DISABLE_PRDR
2079 if ( sx->peer_offered & PEER_OFFERED_PRDR
2080 && verify_check_given_host(&sx->ob->hosts_try_prdr, sx->host) != OK)
2081 sx->peer_offered &= ~PEER_OFFERED_PRDR;
2082
2083 if (sx->peer_offered & PEER_OFFERED_PRDR)
2084 {DEBUG(D_transport) debug_printf("PRDR usable\n");}
2085 #endif
2086
2087 /* Note if the server supports DSN */
2088 smtp_peer_options |= sx->peer_offered & PEER_OFFERED_DSN;
2089 DEBUG(D_transport) debug_printf("%susing DSN\n",
2090 sx->peer_offered & PEER_OFFERED_DSN ? "" : "not ");
2091
2092 /* Note if the response to EHLO specifies support for the AUTH extension.
2093 If it has, check that this host is one we want to authenticate to, and do
2094 the business. The host name and address must be available when the
2095 authenticator's client driver is running. */
2096
2097 switch (yield = smtp_auth(sx->buffer, sizeof(sx->buffer), sx->addrlist, sx->host,
2098 sx->ob, sx->esmtp, &sx->inblock, &sx->outblock))
2099 {
2100 default: goto SEND_QUIT;
2101 case OK: break;
2102 case FAIL_SEND: goto SEND_FAILED;
2103 case FAIL: goto RESPONSE_FAILED;
2104 }
2105 }
2106 }
2107 pipelining_active = !!(smtp_peer_options & PEER_OFFERED_PIPE);
2108
2109 /* The setting up of the SMTP call is now complete. Any subsequent errors are
2110 message-specific. */
2111
2112 sx->setting_up = FALSE;
2113
2114 #ifdef SUPPORT_I18N
2115 if (sx->addrlist->prop.utf8_msg)
2116 {
2117 sx->utf8_needed = !sx->addrlist->prop.utf8_downcvt
2118 && !sx->addrlist->prop.utf8_downcvt_maybe;
2119 DEBUG(D_transport) if (!sx->utf8_needed)
2120 debug_printf("utf8: %s downconvert\n",
2121 sx->addrlist->prop.utf8_downcvt ? "mandatory" : "optional");
2122 }
2123
2124 /* If this is an international message we need the host to speak SMTPUTF8 */
2125 if (sx->utf8_needed && !(sx->peer_offered & PEER_OFFERED_UTF8))
2126 {
2127 errno = ERRNO_UTF8_FWD;
2128 goto RESPONSE_FAILED;
2129 }
2130 #endif
2131
2132 return OK;
2133
2134
2135 {
2136 int code;
2137
2138 RESPONSE_FAILED:
2139 message = NULL;
2140 sx->send_quit = check_response(sx->host, &errno, sx->addrlist->more_errno,
2141 sx->buffer, &code, &message, &pass_message);
2142 goto FAILED;
2143
2144 SEND_FAILED:
2145 code = '4';
2146 message = US string_sprintf("send() to %s [%s] failed: %s",
2147 sx->host->name, sx->host->address, strerror(errno));
2148 sx->send_quit = FALSE;
2149 goto FAILED;
2150
2151 /* This label is jumped to directly when a TLS negotiation has failed,
2152 or was not done for a host for which it is required. Values will be set
2153 in message and errno, and setting_up will always be true. Treat as
2154 a temporary error. */
2155
2156 EHLOHELO_FAILED:
2157 code = '4';
2158 message = string_sprintf("Remote host closed connection in response to %s"
2159 " (EHLO response was: %s)", smtp_command, sx->buffer);
2160 sx->send_quit = FALSE;
2161 goto FAILED;
2162
2163 #ifdef SUPPORT_TLS
2164 TLS_FAILED:
2165 code = '4';
2166 goto FAILED;
2167 #endif
2168
2169 /* The failure happened while setting up the call; see if the failure was
2170 a 5xx response (this will either be on connection, or following HELO - a 5xx
2171 after EHLO causes it to try HELO). If so, fail all addresses, as this host is
2172 never going to accept them. For other errors during setting up (timeouts or
2173 whatever), defer all addresses, and yield DEFER, so that the host is not
2174 tried again for a while. */
2175
2176 FAILED:
2177 sx->ok = FALSE; /* For when reached by GOTO */
2178
2179 yield = code == '5'
2180 #ifdef SUPPORT_I18N
2181 || errno == ERRNO_UTF8_FWD
2182 #endif
2183 ? FAIL : DEFER;
2184
2185 set_errno(sx->addrlist, errno, message, yield, pass_message, sx->host
2186 #ifdef EXPERIMENTAL_DSN_INFO
2187 , sx->smtp_greeting, sx->helo_response
2188 #endif
2189 );
2190 }
2191
2192
2193 SEND_QUIT:
2194
2195 if (sx->send_quit)
2196 (void)smtp_write_command(&sx->outblock, SCMD_FLUSH, "QUIT\r\n");
2197
2198 #ifdef SUPPORT_TLS
2199 tls_close(FALSE, TRUE);
2200 #endif
2201
2202 /* Close the socket, and return the appropriate value, first setting
2203 works because the NULL setting is passed back to the calling process, and
2204 remote_max_parallel is forced to 1 when delivering over an existing connection,
2205
2206 If all went well and continue_more is set, we shouldn't actually get here if
2207 there are further addresses, as the return above will be taken. However,
2208 writing RSET might have failed, or there may be other addresses whose hosts are
2209 specified in the transports, and therefore not visible at top level, in which
2210 case continue_more won't get set. */
2211
2212 HDEBUG(D_transport|D_acl|D_v) debug_printf_indent(" SMTP(close)>>\n");
2213 if (sx->send_quit)
2214 {
2215 shutdown(sx->outblock.sock, SHUT_WR);
2216 if (fcntl(sx->inblock.sock, F_SETFL, O_NONBLOCK) == 0)
2217 for (rc = 16; read(sx->inblock.sock, sx->inbuffer, sizeof(sx->inbuffer)) > 0 && rc > 0;)
2218 rc--; /* drain socket */
2219 sx->send_quit = FALSE;
2220 }
2221 (void)close(sx->inblock.sock);
2222 sx->inblock.sock = sx->outblock.sock = -1;
2223
2224 #ifndef DISABLE_EVENT
2225 (void) event_raise(sx->tblock->event_action, US"tcp:close", NULL);
2226 #endif
2227
2228 continue_transport = NULL;
2229 continue_hostname = NULL;
2230 return yield;
2231 }
2232
2233
2234
2235
2236 /* Create the string of options that will be appended to the MAIL FROM:
2237 in the connection context buffer */
2238
2239 static int
2240 build_mailcmd_options(smtp_context * sx, address_item * addrlist)
2241 {
2242 uschar * p = sx->buffer;
2243 address_item * addr;
2244 int address_count;
2245
2246 *p = 0;
2247
2248 /* If we know the receiving MTA supports the SIZE qualification,
2249 send it, adding something to the message size to allow for imprecision
2250 and things that get added en route. Exim keeps the number of lines
2251 in a message, so we can give an accurate value for the original message, but we
2252 need some additional to handle added headers. (Double "." characters don't get
2253 included in the count.) */
2254
2255 if (sx->peer_offered & PEER_OFFERED_SIZE)
2256 {
2257 sprintf(CS p, " SIZE=%d", message_size+message_linecount+sx->ob->size_addition);
2258 while (*p) p++;
2259 }
2260
2261 #ifndef DISABLE_PRDR
2262 /* If it supports Per-Recipient Data Reponses, and we have omre than one recipient,
2263 request that */
2264
2265 sx->prdr_active = FALSE;
2266 if (sx->peer_offered & PEER_OFFERED_PRDR)
2267 for (addr = addrlist; addr; addr = addr->next)
2268 if (addr->transport_return == PENDING_DEFER)
2269 {
2270 for (addr = addr->next; addr; addr = addr->next)
2271 if (addr->transport_return == PENDING_DEFER)
2272 { /* at least two recipients to send */
2273 sx->prdr_active = TRUE;
2274 sprintf(CS p, " PRDR"); p += 5;
2275 break;
2276 }
2277 break;
2278 }
2279 #endif
2280
2281 #ifdef SUPPORT_I18N
2282 /* If it supports internationalised messages, and this meesage need that,
2283 request it */
2284
2285 if ( sx->peer_offered & PEER_OFFERED_UTF8
2286 && addrlist->prop.utf8_msg
2287 && !addrlist->prop.utf8_downcvt
2288 )
2289 Ustrcpy(p, " SMTPUTF8"), p += 9;
2290 #endif
2291
2292 /* check if all addresses have DSN-lasthop flag; do not send RET and ENVID if so */
2293 for (sx->dsn_all_lasthop = TRUE, addr = addrlist, address_count = 0;
2294 addr && address_count < sx->max_rcpt;
2295 addr = addr->next) if (addr->transport_return == PENDING_DEFER)
2296 {
2297 address_count++;
2298 if (!(addr->dsn_flags & rf_dsnlasthop))
2299 {
2300 sx->dsn_all_lasthop = FALSE;
2301 break;
2302 }
2303 }
2304
2305 /* Add any DSN flags to the mail command */
2306
2307 if (sx->peer_offered & PEER_OFFERED_DSN && !sx->dsn_all_lasthop)
2308 {
2309 if (dsn_ret == dsn_ret_hdrs)
2310 { Ustrcpy(p, " RET=HDRS"); p += 9; }
2311 else if (dsn_ret == dsn_ret_full)
2312 { Ustrcpy(p, " RET=FULL"); p += 9; }
2313
2314 if (dsn_envid)
2315 {
2316 string_format(p, sizeof(sx->buffer) - (p-sx->buffer), " ENVID=%s", dsn_envid);
2317 while (*p) p++;
2318 }
2319 }
2320
2321 /* If an authenticated_sender override has been specified for this transport
2322 instance, expand it. If the expansion is forced to fail, and there was already
2323 an authenticated_sender for this message, the original value will be used.
2324 Other expansion failures are serious. An empty result is ignored, but there is
2325 otherwise no check - this feature is expected to be used with LMTP and other
2326 cases where non-standard addresses (e.g. without domains) might be required. */
2327
2328 if (smtp_mail_auth_str(p, sizeof(sx->buffer) - (p-sx->buffer), addrlist, sx->ob))
2329 return ERROR;
2330
2331 return OK;
2332 }
2333
2334
2335 static void
2336 build_rcptcmd_options(smtp_context * sx, const address_item * addr)
2337 {
2338 uschar * p = sx->buffer;
2339 *p = 0;
2340
2341 /* Add any DSN flags to the rcpt command */
2342
2343 if (sx->peer_offered & PEER_OFFERED_DSN && !(addr->dsn_flags & rf_dsnlasthop))
2344 {
2345 if (addr->dsn_flags & rf_dsnflags)
2346 {
2347 int i;
2348 BOOL first = TRUE;
2349
2350 Ustrcpy(p, " NOTIFY=");
2351 while (*p) p++;
2352 for (i = 0; i < nelem(rf_list); i++) if (addr->dsn_flags & rf_list[i])
2353 {
2354 if (!first) *p++ = ',';
2355 first = FALSE;
2356 Ustrcpy(p, rf_names[i]);
2357 while (*p) p++;
2358 }
2359 }
2360
2361 if (addr->dsn_orcpt)
2362 {
2363 string_format(p, sizeof(sx->buffer) - (p-sx->buffer), " ORCPT=%s",
2364 addr->dsn_orcpt);
2365 while (*p) p++;
2366 }
2367 }
2368 }
2369
2370
2371
2372 /*
2373 Return:
2374 0 good, rcpt results in addr->transport_return (PENDING_OK, DEFER, FAIL)
2375 -1 MAIL response error
2376 -2 any non-MAIL read i/o error
2377 -3 non-MAIL response timeout
2378 -4 internal error; channel still usable
2379 -5 transmit failed
2380 */
2381
2382 int
2383 smtp_write_mail_and_rcpt_cmds(smtp_context * sx, int * yield)
2384 {
2385 address_item * addr;
2386 int address_count;
2387 int rc;
2388
2389 if (build_mailcmd_options(sx, sx->first_addr) != OK)
2390 {
2391 *yield = ERROR;
2392 return -4;
2393 }
2394
2395 /* From here until we send the DATA command, we can make use of PIPELINING
2396 if the server host supports it. The code has to be able to check the responses
2397 at any point, for when the buffer fills up, so we write it totally generally.
2398 When PIPELINING is off, each command written reports that it has flushed the
2399 buffer. */
2400
2401 sx->pending_MAIL = TRUE; /* The block starts with MAIL */
2402
2403 {
2404 uschar * s = sx->from_addr;
2405 #ifdef SUPPORT_I18N
2406 uschar * errstr = NULL;
2407
2408 /* If we must downconvert, do the from-address here. Remember we had to
2409 for the to-addresses (done below), and also (ugly) for re-doing when building
2410 the delivery log line. */
2411
2412 if ( sx->addrlist->prop.utf8_msg
2413 && (sx->addrlist->prop.utf8_downcvt || !(sx->peer_offered & PEER_OFFERED_UTF8))
2414 )
2415 {
2416 if (s = string_address_utf8_to_alabel(s, &errstr), errstr)
2417 {
2418 set_errno_nohost(sx->addrlist, ERRNO_EXPANDFAIL, errstr, DEFER, FALSE);
2419 *yield = ERROR;
2420 return -4;
2421 }
2422 setflag(sx->addrlist, af_utf8_downcvt);
2423 }
2424 #endif
2425
2426 rc = smtp_write_command(&sx->outblock, pipelining_active ? SCMD_BUFFER : SCMD_FLUSH,
2427 "MAIL FROM:<%s>%s\r\n", s, sx->buffer);
2428 }
2429
2430 mail_command = string_copy(big_buffer); /* Save for later error message */
2431
2432 switch(rc)
2433 {
2434 case -1: /* Transmission error */
2435 return -5;
2436
2437 case +1: /* Cmd was sent */
2438 if (!smtp_read_response(&sx->inblock, sx->buffer, sizeof(sx->buffer), '2',
2439 sx->ob->command_timeout))
2440 {
2441 if (errno == 0 && sx->buffer[0] == '4')
2442 {
2443 errno = ERRNO_MAIL4XX;
2444 sx->addrlist->more_errno |= ((sx->buffer[1] - '0')*10 + sx->buffer[2] - '0') << 8;
2445 }
2446 return -1;
2447 }
2448 sx->pending_MAIL = FALSE;
2449 break;
2450
2451 /* otherwise zero: command queued for pipeline */
2452 }
2453
2454 /* Pass over all the relevant recipient addresses for this host, which are the
2455 ones that have status PENDING_DEFER. If we are using PIPELINING, we can send
2456 several before we have to read the responses for those seen so far. This
2457 checking is done by a subroutine because it also needs to be done at the end.
2458 Send only up to max_rcpt addresses at a time, leaving next_addr pointing to
2459 the next one if not all are sent.
2460
2461 In the MUA wrapper situation, we want to flush the PIPELINING buffer for the
2462 last address because we want to abort if any recipients have any kind of
2463 problem, temporary or permanent. We know that all recipient addresses will have
2464 the PENDING_DEFER status, because only one attempt is ever made, and we know
2465 that max_rcpt will be large, so all addresses will be done at once.
2466
2467 For verify we flush the pipeline after any (the only) rcpt address. */
2468
2469 for (addr = sx->first_addr, address_count = 0;
2470 addr && address_count < sx->max_rcpt;
2471 addr = addr->next) if (addr->transport_return == PENDING_DEFER)
2472 {
2473 int count;
2474 BOOL no_flush;
2475 uschar * rcpt_addr;
2476
2477 addr->dsn_aware = sx->peer_offered & PEER_OFFERED_DSN
2478 ? dsn_support_yes : dsn_support_no;
2479
2480 address_count++;
2481 no_flush = pipelining_active && !sx->verify
2482 && (!mua_wrapper || addr->next && address_count < sx->max_rcpt);
2483
2484 build_rcptcmd_options(sx, addr);
2485
2486 /* Now send the RCPT command, and process outstanding responses when
2487 necessary. After a timeout on RCPT, we just end the function, leaving the
2488 yield as OK, because this error can often mean that there is a problem with
2489 just one address, so we don't want to delay the host. */
2490
2491 rcpt_addr = transport_rcpt_address(addr, sx->tblock->rcpt_include_affixes);
2492
2493 #ifdef SUPPORT_I18N
2494 if ( testflag(sx->addrlist, af_utf8_downcvt)
2495 && !(rcpt_addr = string_address_utf8_to_alabel(rcpt_addr, NULL))
2496 )
2497 {
2498 /*XXX could we use a per-address errstr here? Not fail the whole send? */
2499 errno = ERRNO_EXPANDFAIL;
2500 return -5; /*XXX too harsh? */
2501 }
2502 #endif
2503
2504 count = smtp_write_command(&sx->outblock, no_flush ? SCMD_BUFFER : SCMD_FLUSH,
2505 "RCPT TO:<%s>%s%s\r\n", rcpt_addr, sx->igquotstr, sx->buffer);
2506
2507 if (count < 0) return -5;
2508 if (count > 0)
2509 {
2510 switch(sync_responses(sx, count, 0))
2511 {
2512 case 3: sx->ok = TRUE; /* 2xx & 5xx => OK & progress made */
2513 case 2: sx->completed_addr = TRUE; /* 5xx (only) => progress made */
2514 break;
2515
2516 case 1: sx->ok = TRUE; /* 2xx (only) => OK, but if LMTP, */
2517 if (!sx->lmtp) /* can't tell about progress yet */
2518 sx->completed_addr = TRUE;
2519 case 0: /* No 2xx or 5xx, but no probs */
2520 break;
2521
2522 case -1: return -3; /* Timeout on RCPT */
2523 case -2: return -2; /* non-MAIL read i/o error */
2524 default: return -1; /* any MAIL error */
2525 }
2526 sx->pending_MAIL = FALSE; /* Dealt with MAIL */
2527 }
2528 } /* Loop for next address */
2529
2530 sx->next_addr = addr;
2531 return 0;
2532 }
2533
2534
2535 #ifdef SUPPORT_TLS
2536 /*****************************************************
2537 * Proxy TLS connection for another transport process *
2538 ******************************************************/
2539 /*
2540 Use the given buffer as a staging area, and select on both the given fd
2541 and the TLS'd client-fd for data to read (per the coding in ip_recv() and
2542 fd_ready() this is legitimate). Do blocking full-size writes, and reads
2543 under a timeout.
2544
2545 Arguments:
2546 buf space to use for buffering
2547 bufsiz size of buffer
2548 proxy_fd comms to proxied process
2549 timeout per-read timeout, seconds
2550 */
2551
2552 void
2553 smtp_proxy_tls(uschar * buf, size_t bsize, int proxy_fd, int timeout)
2554 {
2555 fd_set fds;
2556 int max_fd = MAX(proxy_fd, tls_out.active) + 1;
2557 int rc, i, fd_bits, nbytes;
2558
2559 set_process_info("proxying TLS connection for continued transport");
2560 FD_ZERO(&fds);
2561 FD_SET(tls_out.active, &fds);
2562 FD_SET(proxy_fd, &fds);
2563
2564 for (fd_bits = 3; fd_bits; )
2565 {
2566 time_t time_left = timeout;
2567 time_t time_start = time(NULL);
2568
2569 /* wait for data */
2570 do
2571 {
2572 struct timeval tv = { time_left, 0 };
2573
2574 rc = select(max_fd, (SELECT_ARG2_TYPE *)&fds, NULL, NULL, &tv);
2575
2576 if (rc < 0 && errno == EINTR)
2577 if ((time_left -= time(NULL) - time_start) > 0) continue;
2578
2579 if (rc <= 0)
2580 {
2581 DEBUG(D_transport) if (rc == 0) debug_printf("%s: timed out\n", __FUNCTION__);
2582 return;
2583 }
2584 }
2585 while (rc < 0 || !(FD_ISSET(tls_out.active, &fds) || FD_ISSET(proxy_fd, &fds)));
2586
2587 /* handle inbound data */
2588 if (FD_ISSET(tls_out.active, &fds))
2589 if ((rc = tls_read(FALSE, buf, bsize)) <= 0)
2590 {
2591 fd_bits &= ~1;
2592 FD_CLR(tls_out.active, &fds);
2593 shutdown(proxy_fd, SHUT_WR);
2594 }
2595 else
2596 {
2597 for (nbytes = 0; rc - nbytes > 0; nbytes += i)
2598 if ((i = write(proxy_fd, buf + nbytes, rc - nbytes)) < 0) return;
2599 }
2600 else if (fd_bits & 1)
2601 FD_SET(tls_out.active, &fds);
2602
2603 /* handle outbound data */
2604 if (FD_ISSET(proxy_fd, &fds))
2605 if ((rc = read(proxy_fd, buf, bsize)) <= 0)
2606 {
2607 fd_bits &= ~2;
2608 FD_CLR(proxy_fd, &fds);
2609 shutdown(tls_out.active, SHUT_WR);
2610 }
2611 else
2612 {
2613 for (nbytes = 0; rc - nbytes > 0; nbytes += i)
2614 if ((i = tls_write(FALSE, buf + nbytes, rc - nbytes)) < 0) return;
2615 }
2616 else if (fd_bits & 2)
2617 FD_SET(proxy_fd, &fds);
2618 }
2619 }
2620 #endif
2621
2622
2623 /*************************************************
2624 * Deliver address list to given host *
2625 *************************************************/
2626
2627 /* If continue_hostname is not null, we get here only when continuing to
2628 deliver down an existing channel. The channel was passed as the standard
2629 input. TLS is never active on a passed channel; the previous process always
2630 closes it down before passing the connection on.
2631
2632 Otherwise, we have to make a connection to the remote host, and do the
2633 initial protocol exchange.
2634
2635 When running as an MUA wrapper, if the sender or any recipient is rejected,
2636 temporarily or permanently, we force failure for all recipients.
2637
2638 Arguments:
2639 addrlist chain of potential addresses to deliver; only those whose
2640 transport_return field is set to PENDING_DEFER are currently
2641 being processed; others should be skipped - they have either
2642 been delivered to an earlier host or IP address, or been
2643 failed by one of them.
2644 host host to deliver to
2645 host_af AF_INET or AF_INET6
2646 port default TCP/IP port to use, in host byte order
2647 interface interface to bind to, or NULL
2648 tblock transport instance block
2649 message_defer set TRUE if yield is OK, but all addresses were deferred
2650 because of a non-recipient, non-host failure, that is, a
2651 4xx response to MAIL FROM, DATA, or ".". This is a defer
2652 that is specific to the message.
2653 suppress_tls if TRUE, don't attempt a TLS connection - this is set for
2654 a second attempt after TLS initialization fails
2655
2656 Returns: OK - the connection was made and the delivery attempted;
2657 the result for each address is in its data block.
2658 DEFER - the connection could not be made, or something failed
2659 while setting up the SMTP session, or there was a
2660 non-message-specific error, such as a timeout.
2661 ERROR - a filter command is specified for this transport,
2662 and there was a problem setting it up; OR helo_data
2663 or add_headers or authenticated_sender is specified
2664 for this transport, and the string failed to expand
2665 */
2666
2667 static int
2668 smtp_deliver(address_item *addrlist, host_item *host, int host_af, int port,
2669 uschar *interface, transport_instance *tblock,
2670 BOOL *message_defer, BOOL suppress_tls)
2671 {
2672 address_item *addr;
2673 int yield = OK;
2674 int save_errno;
2675 int rc;
2676 time_t start_delivery_time = time(NULL);
2677
2678 BOOL pass_message = FALSE;
2679 uschar *message = NULL;
2680 uschar new_message_id[MESSAGE_ID_LENGTH + 1];
2681 uschar *p;
2682
2683 smtp_context sx;
2684
2685 suppress_tls = suppress_tls; /* stop compiler warning when no TLS support */
2686 *message_defer = FALSE;
2687
2688 sx.addrlist = addrlist;
2689 sx.host = host;
2690 sx.host_af = host_af,
2691 sx.port = port;
2692 sx.interface = interface;
2693 sx.helo_data = NULL;
2694 sx.tblock = tblock;
2695 sx.verify = FALSE;
2696
2697 /* Get the channel set up ready for a message (MAIL FROM being the next
2698 SMTP command to send */
2699
2700 if ((rc = smtp_setup_conn(&sx, suppress_tls)) != OK)
2701 return rc;
2702
2703 /* If there is a filter command specified for this transport, we can now
2704 set it up. This cannot be done until the identify of the host is known. */
2705
2706 if (tblock->filter_command)
2707 {
2708 transport_filter_timeout = tblock->filter_timeout;
2709
2710 /* On failure, copy the error to all addresses, abandon the SMTP call, and
2711 yield ERROR. */
2712
2713 if (!transport_set_up_command(&transport_filter_argv,
2714 tblock->filter_command, TRUE, DEFER, addrlist,
2715 string_sprintf("%.50s transport", tblock->name), NULL))
2716 {
2717 set_errno_nohost(addrlist->next, addrlist->basic_errno, addrlist->message, DEFER,
2718 FALSE);
2719 yield = ERROR;
2720 goto SEND_QUIT;
2721 }
2722
2723 if ( transport_filter_argv
2724 && *transport_filter_argv
2725 && **transport_filter_argv
2726 && sx.peer_offered & PEER_OFFERED_CHUNKING
2727 )
2728 {
2729 sx.peer_offered &= ~PEER_OFFERED_CHUNKING;
2730 DEBUG(D_transport) debug_printf("CHUNKING not usable due to transport filter\n");
2731 }
2732 }
2733
2734 sx.first_addr = addrlist;
2735
2736 /* For messages that have more than the maximum number of envelope recipients,
2737 we want to send several transactions down the same SMTP connection. (See
2738 comments in deliver.c as to how this reconciles, heuristically, with
2739 remote_max_parallel.) This optimization was added to Exim after the following
2740 code was already working. The simplest way to put it in without disturbing the
2741 code was to use a goto to jump back to this point when there is another
2742 transaction to handle. */
2743
2744 SEND_MESSAGE:
2745 sx.from_addr = return_path;
2746 sx.sync_addr = sx.first_addr;
2747 sx.ok = FALSE;
2748 sx.send_rset = TRUE;
2749 sx.completed_addr = FALSE;
2750
2751
2752 /* If we are a continued-connection-after-verify the MAIL and RCPT
2753 commands were already sent; do not re-send but do mark the addrs as
2754 having been accepted up to RCPT stage. A traditional cont-conn
2755 always has a sequence number greater than one. */
2756
2757 if (continue_hostname && continue_sequence == 1)
2758 {
2759 address_item * addr;
2760
2761 sx.peer_offered = smtp_peer_options;
2762 sx.pending_MAIL = FALSE;
2763 sx.ok = TRUE;
2764 sx.next_addr = NULL;
2765
2766 for (addr = addrlist; addr; addr = addr->next)
2767 addr->transport_return = PENDING_OK;
2768 }
2769 else
2770 {
2771 /* Initiate a message transfer. */
2772
2773 switch(smtp_write_mail_and_rcpt_cmds(&sx, &yield))
2774 {
2775 case 0: break;
2776 case -1: case -2: goto RESPONSE_FAILED;
2777 case -3: goto END_OFF;
2778 case -4: goto SEND_QUIT;
2779 default: goto SEND_FAILED;
2780 }
2781
2782 /* If we are an MUA wrapper, abort if any RCPTs were rejected, either
2783 permanently or temporarily. We should have flushed and synced after the last
2784 RCPT. */
2785
2786 if (mua_wrapper)
2787 {
2788 address_item * a;
2789 unsigned cnt;
2790
2791 for (a = sx.first_addr, cnt = 0; a && cnt < sx.max_rcpt; a = a->next, cnt++)
2792 if (a->transport_return != PENDING_OK)
2793 {
2794 /*XXX could we find a better errno than 0 here? */
2795 set_errno_nohost(addrlist, 0, a->message, FAIL,
2796 testflag(a, af_pass_message));
2797 sx.ok = FALSE;
2798 break;
2799 }
2800 }
2801 }
2802
2803 /* If ok is TRUE, we know we have got at least one good recipient, and must now
2804 send DATA, but if it is FALSE (in the normal, non-wrapper case), we may still
2805 have a good recipient buffered up if we are pipelining. We don't want to waste
2806 time sending DATA needlessly, so we only send it if either ok is TRUE or if we
2807 are pipelining. The responses are all handled by sync_responses().
2808 If using CHUNKING, do not send a BDAT until we know how big a chunk we want
2809 to send is. */
2810
2811 if ( !(sx.peer_offered & PEER_OFFERED_CHUNKING)
2812 && (sx.ok || (pipelining_active && !mua_wrapper)))
2813 {
2814 int count = smtp_write_command(&sx.outblock, SCMD_FLUSH, "DATA\r\n");
2815
2816 if (count < 0) goto SEND_FAILED;
2817 switch(sync_responses(&sx, count, sx.ok ? +1 : -1))
2818 {
2819 case 3: sx.ok = TRUE; /* 2xx & 5xx => OK & progress made */
2820 case 2: sx.completed_addr = TRUE; /* 5xx (only) => progress made */
2821 break;
2822
2823 case 1: sx.ok = TRUE; /* 2xx (only) => OK, but if LMTP, */
2824 if (!sx.lmtp) sx.completed_addr = TRUE; /* can't tell about progress yet */
2825 case 0: break; /* No 2xx or 5xx, but no probs */
2826
2827 case -1: goto END_OFF; /* Timeout on RCPT */
2828 default: goto RESPONSE_FAILED; /* I/O error, or any MAIL/DATA error */
2829 }
2830 pipelining_active = FALSE;
2831 data_command = string_copy(big_buffer); /* Save for later error message */
2832 }
2833
2834 /* If there were no good recipients (but otherwise there have been no
2835 problems), just set ok TRUE, since we have handled address-specific errors
2836 already. Otherwise, it's OK to send the message. Use the check/escape mechanism
2837 for handling the SMTP dot-handling protocol, flagging to apply to headers as
2838 well as body. Set the appropriate timeout value to be used for each chunk.
2839 (Haven't been able to make it work using select() for writing yet.) */
2840
2841 if (!(sx.peer_offered & PEER_OFFERED_CHUNKING) && !sx.ok)
2842 {
2843 /* Save the first address of the next batch. */
2844 sx.first_addr = sx.next_addr;
2845
2846 sx.ok = TRUE;
2847 }
2848 else
2849 {
2850 transport_ctx tctx = {
2851 sx.inblock.sock,
2852 tblock,
2853 addrlist,
2854 US".", US"..", /* Escaping strings */
2855 topt_use_crlf | topt_escape_headers
2856 | (tblock->body_only ? topt_no_headers : 0)
2857 | (tblock->headers_only ? topt_no_body : 0)
2858 | (tblock->return_path_add ? topt_add_return_path : 0)
2859 | (tblock->delivery_date_add ? topt_add_delivery_date : 0)
2860 | (tblock->envelope_to_add ? topt_add_envelope_to : 0)
2861 };
2862
2863 /* If using CHUNKING we need a callback from the generic transport
2864 support to us, for the sending of BDAT smtp commands and the reaping
2865 of responses. The callback needs a whole bunch of state so set up
2866 a transport-context structure to be passed around. */
2867
2868 if (sx.peer_offered & PEER_OFFERED_CHUNKING)
2869 {
2870 tctx.check_string = tctx.escape_string = NULL;
2871 tctx.options |= topt_use_bdat;
2872 tctx.chunk_cb = smtp_chunk_cmd_callback;
2873 sx.pending_BDAT = FALSE;
2874 sx.good_RCPT = sx.ok;
2875 sx.cmd_count = 0;
2876 tctx.smtp_context = &sx;
2877 }
2878 else
2879 tctx.options |= topt_end_dot;
2880
2881 /* Save the first address of the next batch. */
2882 sx.first_addr = sx.next_addr;
2883
2884 /* Responses from CHUNKING commands go in buffer. Otherwise,
2885 there has not been a response. */
2886
2887 sx.buffer[0] = 0;
2888
2889 sigalrm_seen = FALSE;
2890 transport_write_timeout = sx.ob->data_timeout;
2891 smtp_command = US"sending data block"; /* For error messages */
2892 DEBUG(D_transport|D_v)
2893 if (sx.peer_offered & PEER_OFFERED_CHUNKING)
2894 debug_printf(" will write message using CHUNKING\n");
2895 else
2896 debug_printf(" SMTP>> writing message and terminating \".\"\n");
2897 transport_count = 0;
2898
2899 #ifndef DISABLE_DKIM
2900 sx.ok = dkim_transport_write_message(&tctx, &sx.ob->dkim, CUSS &message);
2901 #else
2902 sx.ok = transport_write_message(&tctx, 0);
2903 #endif
2904
2905 /* transport_write_message() uses write() because it is called from other
2906 places to write to non-sockets. This means that under some OS (e.g. Solaris)
2907 it can exit with "Broken pipe" as its error. This really means that the
2908 socket got closed at the far end. */
2909
2910 transport_write_timeout = 0; /* for subsequent transports */
2911
2912 /* Failure can either be some kind of I/O disaster (including timeout),
2913 or the failure of a transport filter or the expansion of added headers.
2914 Or, when CHUNKING, it can be a protocol-detected failure. */
2915
2916 if (!sx.ok)
2917 if (message) goto SEND_FAILED;
2918 else goto RESPONSE_FAILED;
2919
2920 /* We used to send the terminating "." explicitly here, but because of
2921 buffering effects at both ends of TCP/IP connections, you don't gain
2922 anything by keeping it separate, so it might as well go in the final
2923 data buffer for efficiency. This is now done by setting the topt_end_dot
2924 flag above. */
2925
2926 smtp_command = US"end of data";
2927
2928 if (sx.peer_offered & PEER_OFFERED_CHUNKING && sx.cmd_count > 1)
2929 {
2930 /* Reap any outstanding MAIL & RCPT commands, but not a DATA-go-ahead */
2931 switch(sync_responses(&sx, sx.cmd_count-1, 0))
2932 {
2933 case 3: sx.ok = TRUE; /* 2xx & 5xx => OK & progress made */
2934 case 2: sx.completed_addr = TRUE; /* 5xx (only) => progress made */
2935 break;
2936
2937 case 1: sx.ok = TRUE; /* 2xx (only) => OK, but if LMTP, */
2938 if (!sx.lmtp) sx.completed_addr = TRUE; /* can't tell about progress yet */
2939 case 0: break; /* No 2xx or 5xx, but no probs */
2940
2941 case -1: goto END_OFF; /* Timeout on RCPT */
2942 default: goto RESPONSE_FAILED; /* I/O error, or any MAIL/DATA error */
2943 }
2944 }
2945
2946 #ifndef DISABLE_PRDR
2947 /* For PRDR we optionally get a partial-responses warning
2948 * followed by the individual responses, before going on with
2949 * the overall response. If we don't get the warning then deal
2950 * with per non-PRDR. */
2951 if(sx.prdr_active)
2952 {
2953 sx.ok = smtp_read_response(&sx.inblock, sx.buffer, sizeof(sx.buffer), '3',
2954 sx.ob->final_timeout);
2955 if (!sx.ok && errno == 0) switch(sx.buffer[0])
2956 {
2957 case '2': sx.prdr_active = FALSE;
2958 sx.ok = TRUE;
2959 break;
2960 case '4': errno = ERRNO_DATA4XX;
2961 addrlist->more_errno |=
2962 ((sx.buffer[1] - '0')*10 + sx.buffer[2] - '0') << 8;
2963 break;
2964 }
2965 }
2966 else
2967 #endif
2968
2969 /* For non-PRDR SMTP, we now read a single response that applies to the
2970 whole message. If it is OK, then all the addresses have been delivered. */
2971
2972 if (!sx.lmtp)
2973 {
2974 sx.ok = smtp_read_response(&sx.inblock, sx.buffer, sizeof(sx.buffer), '2',
2975 sx.ob->final_timeout);
2976 if (!sx.ok && errno == 0 && sx.buffer[0] == '4')
2977 {
2978 errno = ERRNO_DATA4XX;
2979 addrlist->more_errno |= ((sx.buffer[1] - '0')*10 + sx.buffer[2] - '0') << 8;
2980 }
2981 }
2982
2983 /* For LMTP, we get back a response for every RCPT command that we sent;
2984 some may be accepted and some rejected. For those that get a response, their
2985 status is fixed; any that are accepted have been handed over, even if later
2986 responses crash - at least, that's how I read RFC 2033.
2987
2988 If all went well, mark the recipient addresses as completed, record which
2989 host/IPaddress they were delivered to, and cut out RSET when sending another
2990 message down the same channel. Write the completed addresses to the journal
2991 now so that they are recorded in case there is a crash of hardware or
2992 software before the spool gets updated. Also record the final SMTP
2993 confirmation if needed (for SMTP only). */
2994
2995 if (sx.ok)
2996 {
2997 int flag = '=';
2998 int delivery_time = (int)(time(NULL) - start_delivery_time);
2999 int len;
3000 uschar *conf = NULL;
3001
3002 sx.send_rset = FALSE;
3003 pipelining_active = FALSE;
3004
3005 /* Set up confirmation if needed - applies only to SMTP */
3006
3007 if (
3008 #ifdef DISABLE_EVENT
3009 LOGGING(smtp_confirmation) &&
3010 #endif
3011 !sx.lmtp
3012 )
3013 {
3014 const uschar *s = string_printing(sx.buffer);
3015 /* deconst cast ok here as string_printing was checked to have alloc'n'copied */
3016 conf = (s == sx.buffer)? (uschar *)string_copy(s) : US s;
3017 }
3018
3019 /* Process all transported addresses - for LMTP or PRDR, read a status for
3020 each one. */
3021
3022 for (addr = addrlist; addr != sx.first_addr; addr = addr->next)
3023 {
3024 if (addr->transport_return != PENDING_OK) continue;
3025
3026 /* LMTP - if the response fails badly (e.g. timeout), use it for all the
3027 remaining addresses. Otherwise, it's a return code for just the one
3028 address. For temporary errors, add a retry item for the address so that
3029 it doesn't get tried again too soon. */
3030
3031 #ifndef DISABLE_PRDR
3032 if (sx.lmtp || sx.prdr_active)
3033 #else
3034 if (sx.lmtp)
3035 #endif
3036 {
3037 if (!smtp_read_response(&sx.inblock, sx.buffer, sizeof(sx.buffer), '2',
3038 sx.ob->final_timeout))
3039 {
3040 if (errno != 0 || sx.buffer[0] == 0) goto RESPONSE_FAILED;
3041 addr->message = string_sprintf(
3042 #ifndef DISABLE_PRDR
3043 "%s error after %s: %s", sx.prdr_active ? "PRDR":"LMTP",
3044 #else
3045 "LMTP error after %s: %s",
3046 #endif
3047 data_command, string_printing(sx.buffer));
3048 setflag(addr, af_pass_message); /* Allow message to go to user */
3049 if (sx.buffer[0] == '5')
3050 addr->transport_return = FAIL;
3051 else
3052 {
3053 errno = ERRNO_DATA4XX;
3054 addr->more_errno |= ((sx.buffer[1] - '0')*10 + sx.buffer[2] - '0') << 8;
3055 addr->transport_return = DEFER;
3056 #ifndef DISABLE_PRDR
3057 if (!sx.prdr_active)
3058 #endif
3059 retry_add_item(addr, addr->address_retry_key, 0);
3060 }
3061 continue;
3062 }
3063 sx.completed_addr = TRUE; /* NOW we can set this flag */
3064 if (LOGGING(smtp_confirmation))
3065 {
3066 const uschar *s = string_printing(sx.buffer);
3067 /* deconst cast ok here as string_printing was checked to have alloc'n'copied */
3068 conf = (s == sx.buffer) ? US string_copy(s) : US s;
3069 }
3070 }
3071
3072 /* SMTP, or success return from LMTP for this address. Pass back the
3073 actual host that was used. */
3074
3075 addr->transport_return = OK;
3076 addr->more_errno = delivery_time;
3077 addr->host_used = host;
3078 addr->special_action = flag;
3079 addr->message = conf;
3080 #ifndef DISABLE_PRDR
3081 if (sx.prdr_active) addr->flags |= af_prdr_used;
3082 #endif
3083 if (sx.peer_offered & PEER_OFFERED_CHUNKING) addr->flags |= af_chunking_used;
3084 flag = '-';
3085
3086 #ifndef DISABLE_PRDR
3087 if (!sx.prdr_active)
3088 #endif
3089 {
3090 /* Update the journal. For homonymic addresses, use the base address plus
3091 the transport name. See lots of comments in deliver.c about the reasons
3092 for the complications when homonyms are involved. Just carry on after
3093 write error, as it may prove possible to update the spool file later. */
3094
3095 if (testflag(addr, af_homonym))
3096 sprintf(CS sx.buffer, "%.500s/%s\n", addr->unique + 3, tblock->name);
3097 else
3098 sprintf(CS sx.buffer, "%.500s\n", addr->unique);
3099
3100 DEBUG(D_deliver) debug_printf("S:journalling %s\n", sx.buffer);
3101 len = Ustrlen(CS sx.buffer);
3102 if (write(journal_fd, sx.buffer, len) != len)
3103 log_write(0, LOG_MAIN|LOG_PANIC, "failed to write journal for "
3104 "%s: %s", sx.buffer, strerror(errno));
3105 }
3106 }
3107
3108 #ifndef DISABLE_PRDR
3109 if (sx.prdr_active)
3110 {
3111 /* PRDR - get the final, overall response. For any non-success
3112 upgrade all the address statuses. */
3113 sx.ok = smtp_read_response(&sx.inblock, sx.buffer, sizeof(sx.buffer), '2',
3114 sx.ob->final_timeout);
3115 if (!sx.ok)
3116 {
3117 if(errno == 0 && sx.buffer[0] == '4')
3118 {
3119 errno = ERRNO_DATA4XX;
3120 addrlist->more_errno |= ((sx.buffer[1] - '0')*10 + sx.buffer[2] - '0') << 8;
3121 }
3122 for (addr = addrlist; addr != sx.first_addr; addr = addr->next)
3123 if (sx.buffer[0] == '5' || addr->transport_return == OK)
3124 addr->transport_return = PENDING_OK; /* allow set_errno action */
3125 goto RESPONSE_FAILED;
3126 }
3127
3128 /* Update the journal, or setup retry. */
3129 for (addr = addrlist; addr != sx.first_addr; addr = addr->next)
3130 if (addr->transport_return == OK)
3131 {
3132 if (testflag(addr, af_homonym))
3133 sprintf(CS sx.buffer, "%.500s/%s\n", addr->unique + 3, tblock->name);
3134 else
3135 sprintf(CS sx.buffer, "%.500s\n", addr->unique);
3136
3137 DEBUG(D_deliver) debug_printf("journalling(PRDR) %s\n", sx.buffer);
3138 len = Ustrlen(CS sx.buffer);
3139 if (write(journal_fd, sx.buffer, len) != len)
3140 log_write(0, LOG_MAIN|LOG_PANIC, "failed to write journal for "
3141 "%s: %s", sx.buffer, strerror(errno));
3142 }
3143 else if (addr->transport_return == DEFER)
3144 retry_add_item(addr, addr->address_retry_key, -2);
3145 }
3146 #endif
3147
3148 /* Ensure the journal file is pushed out to disk. */
3149
3150 if (EXIMfsync(journal_fd) < 0)
3151 log_write(0, LOG_MAIN|LOG_PANIC, "failed to fsync journal: %s",
3152 strerror(errno));
3153 }
3154 }
3155
3156
3157 /* Handle general (not specific to one address) failures here. The value of ok
3158 is used to skip over this code on the falling through case. A timeout causes a
3159 deferral. Other errors may defer or fail according to the response code, and
3160 may set up a special errno value, e.g. after connection chopped, which is
3161 assumed if errno == 0 and there is no text in the buffer. If control reaches
3162 here during the setting up phase (i.e. before MAIL FROM) then always defer, as
3163 the problem is not related to this specific message. */
3164
3165 if (!sx.ok)
3166 {
3167 int code, set_rc;
3168 uschar * set_message;
3169
3170 RESPONSE_FAILED:
3171 {
3172 save_errno = errno;
3173 message = NULL;
3174 sx.send_quit = check_response(host, &save_errno, addrlist->more_errno,
3175 sx.buffer, &code, &message, &pass_message);
3176 goto FAILED;
3177 }
3178
3179 SEND_FAILED:
3180 {
3181 save_errno = errno;
3182 code = '4';
3183 message = string_sprintf("send() to %s [%s] failed: %s",
3184 host->name, host->address, message ? message : US strerror(save_errno));
3185 sx.send_quit = FALSE;
3186 goto FAILED;
3187 }
3188
3189 FAILED:
3190 {
3191 BOOL message_error;
3192
3193 sx.ok = FALSE; /* For when reached by GOTO */
3194 set_message = message;
3195
3196 /* We want to handle timeouts after MAIL or "." and loss of connection after
3197 "." specially. They can indicate a problem with the sender address or with
3198 the contents of the message rather than a real error on the connection. These
3199 cases are treated in the same way as a 4xx response. This next bit of code
3200 does the classification. */
3201
3202 switch(save_errno)
3203 {
3204 case 0:
3205 case ERRNO_MAIL4XX:
3206 case ERRNO_DATA4XX:
3207 message_error = TRUE;
3208 break;
3209
3210 case ETIMEDOUT:
3211 message_error = Ustrncmp(smtp_command,"MAIL",4) == 0 ||
3212 Ustrncmp(smtp_command,"end ",4) == 0;
3213 break;
3214
3215 case ERRNO_SMTPCLOSED:
3216 message_error = Ustrncmp(smtp_command,"end ",4) == 0;
3217 break;
3218
3219 default:
3220 message_error = FALSE;
3221 break;
3222 }
3223
3224 /* Handle the cases that are treated as message errors. These are:
3225
3226 (a) negative response or timeout after MAIL
3227 (b) negative response after DATA
3228 (c) negative response or timeout or dropped connection after "."
3229 (d) utf8 support required and not offered
3230
3231 It won't be a negative response or timeout after RCPT, as that is dealt
3232 with separately above. The action in all cases is to set an appropriate
3233 error code for all the addresses, but to leave yield set to OK because the
3234 host itself has not failed. Of course, it might in practice have failed
3235 when we've had a timeout, but if so, we'll discover that at the next
3236 delivery attempt. For a temporary error, set the message_defer flag, and
3237 write to the logs for information if this is not the last host. The error
3238 for the last host will be logged as part of the address's log line. */
3239
3240 if (message_error)
3241 {
3242 if (mua_wrapper) code = '5'; /* Force hard failure in wrapper mode */
3243
3244 /* If there's an errno, the message contains just the identity of
3245 the host. */
3246
3247 if (code == '5')
3248 set_rc = FAIL;
3249 else /* Anything other than 5 is treated as temporary */
3250 {
3251 set_rc = DEFER;
3252 if (save_errno > 0)
3253 message = US string_sprintf("%s: %s", message, strerror(save_errno));
3254 if (host->next != NULL) log_write(0, LOG_MAIN, "%s", message);
3255 msglog_line(host, message);
3256 *message_defer = TRUE;
3257 }
3258 }
3259
3260 /* Otherwise, we have an I/O error or a timeout other than after MAIL or
3261 ".", or some other transportation error. We defer all addresses and yield
3262 DEFER, except for the case of failed add_headers expansion, or a transport
3263 filter failure, when the yield should be ERROR, to stop it trying other
3264 hosts. */
3265
3266 else
3267 {
3268 set_rc = DEFER;
3269 yield = (save_errno == ERRNO_CHHEADER_FAIL ||
3270 save_errno == ERRNO_FILTER_FAIL)? ERROR : DEFER;
3271 }
3272 }
3273
3274 set_errno(addrlist, save_errno, set_message, set_rc, pass_message, host
3275 #ifdef EXPERIMENTAL_DSN_INFO
3276 , sx.smtp_greeting, sx.helo_response
3277 #endif
3278 );
3279 }
3280
3281
3282 /* If all has gone well, send_quit will be set TRUE, implying we can end the
3283 SMTP session tidily. However, if there were too many addresses to send in one
3284 message (indicated by first_addr being non-NULL) we want to carry on with the
3285 rest of them. Also, it is desirable to send more than one message down the SMTP
3286 connection if there are several waiting, provided we haven't already sent so
3287 many as to hit the configured limit. The function transport_check_waiting looks
3288 for a waiting message and returns its id. Then transport_pass_socket tries to
3289 set up a continued delivery by passing the socket on to another process. The
3290 variable send_rset is FALSE if a message has just been successfully transfered.
3291
3292 If we are already sending down a continued channel, there may be further
3293 addresses not yet delivered that are aimed at the same host, but which have not
3294 been passed in this run of the transport. In this case, continue_more will be
3295 true, and all we should do is send RSET if necessary, and return, leaving the
3296 channel open.
3297
3298 However, if no address was disposed of, i.e. all addresses got 4xx errors, we
3299 do not want to continue with other messages down the same channel, because that
3300 can lead to looping between two or more messages, all with the same,
3301 temporarily failing address(es). [The retry information isn't updated yet, so
3302 new processes keep on trying.] We probably also don't want to try more of this
3303 message's addresses either.
3304
3305 If we have started a TLS session, we have to end it before passing the
3306 connection to a new process. However, not all servers can handle this (Exim
3307 can), so we do not pass such a connection on if the host matches
3308 hosts_nopass_tls. */
3309
3310 DEBUG(D_transport)
3311 debug_printf("ok=%d send_quit=%d send_rset=%d continue_more=%d "
3312 "yield=%d first_address is %sNULL\n", sx.ok, sx.send_quit,
3313 sx.send_rset, continue_more, yield, sx.first_addr ? "not " : "");
3314
3315 if (sx.completed_addr && sx.ok && sx.send_quit)
3316 {
3317 BOOL more;
3318 smtp_compare_t t_compare;
3319
3320 t_compare.tblock = tblock;
3321 t_compare.current_sender_address = sender_address;
3322
3323 if ( sx.first_addr != NULL
3324 || continue_more
3325 || (
3326 #ifdef SUPPORT_TLS
3327 ( tls_out.active < 0 && !continue_proxy_cipher
3328 || verify_check_given_host(&sx.ob->hosts_nopass_tls, host) != OK
3329 )
3330 &&
3331 #endif
3332 transport_check_waiting(tblock->name, host->name,
3333 tblock->connection_max_messages, new_message_id, &more,
3334 (oicf)smtp_are_same_identities, (void*)&t_compare)
3335 ) )
3336 {
3337 uschar *msg;
3338 BOOL pass_message;
3339
3340 if (sx.send_rset)
3341 if (! (sx.ok = smtp_write_command(&sx.outblock, SCMD_FLUSH, "RSET\r\n") >= 0))
3342 {
3343 msg = US string_sprintf("send() to %s [%s] failed: %s", host->name,
3344 host->address, strerror(errno));
3345 sx.send_quit = FALSE;
3346 }
3347 else if (! (sx.ok = smtp_read_response(&sx.inblock, sx.buffer,
3348 sizeof(sx.buffer), '2', sx.ob->command_timeout)))
3349 {
3350 int code;
3351 sx.send_quit = check_response(host, &errno, 0, sx.buffer, &code, &msg,
3352 &pass_message);
3353 if (!sx.send_quit)
3354 {
3355 DEBUG(D_transport) debug_printf("H=%s [%s] %s\n",
3356 host->name, host->address, msg);
3357 }
3358 }
3359
3360 /* Either RSET was not needed, or it succeeded */
3361
3362 if (sx.ok)
3363 {
3364 int pfd[2];
3365 int socket_fd = sx.inblock.sock;
3366
3367
3368 if (sx.first_addr != NULL) /* More addresses still to be sent */
3369 { /* in this run of the transport */
3370 continue_sequence++; /* Causes * in logging */
3371 goto SEND_MESSAGE;
3372 }
3373 if (continue_more) return yield; /* More addresses for another run */
3374
3375 /* Pass the connection on to a new Exim process. */
3376 #ifdef SUPPORT_TLS
3377 if (tls_out.active >= 0)
3378 if (verify_check_given_host(&sx.ob->hosts_noproxy_tls, host) == OK)
3379 {
3380 /* Pass the socket, for direct use, to a new Exim process. Before
3381 doing so, we must shut down TLS. Not all MTAs allow for the
3382 continuation of the SMTP session when TLS is shut down. We test for
3383 this by sending a new EHLO. If we don't get a good response, we don't
3384 attempt to pass the socket on. */
3385
3386 tls_close(FALSE, TRUE);
3387 smtp_peer_options = smtp_peer_options_wrap;
3388 sx.ok = !sx.smtps
3389 && smtp_write_command(&sx.outblock, SCMD_FLUSH,
3390 "EHLO %s\r\n", sx.helo_data) >= 0
3391 && smtp_read_response(&sx.inblock, sx.buffer, sizeof(sx.buffer),
3392 '2', sx.ob->command_timeout);
3393 }
3394 else
3395 {
3396 /* Set up a pipe for proxying TLS for the new transport process */
3397
3398 smtp_peer_options |= PEER_OFFERED_TLS;
3399 if (sx.ok = (socketpair(AF_UNIX, SOCK_STREAM, 0, pfd) == 0))
3400 socket_fd = pfd[1];
3401 else
3402 set_errno(sx.first_addr, errno, US"internal allocation problem",
3403 DEFER, FALSE, host
3404 # ifdef EXPERIMENTAL_DSN_INFO
3405 , sx.smtp_greeting, sx.helo_response
3406 # endif
3407 );
3408 }
3409 #endif
3410
3411 /* If the socket is successfully passed, we mustn't send QUIT (or
3412 indeed anything!) from here. */
3413
3414 /*XXX DSN_INFO: assume likely to do new HELO; but for greet we'll want to
3415 propagate it from the initial
3416 */
3417 if (sx.ok && transport_pass_socket(tblock->name, host->name,
3418 host->address, new_message_id, socket_fd))
3419 {
3420 sx.send_quit = FALSE;
3421
3422 /* If TLS is still active, we need to proxy it for the transport we
3423 just passed the baton to. Fork a child to to do it, and return to
3424 get logging done asap. Which way to place the work makes assumptions
3425 about post-fork prioritisation which may not hold on all platforms. */
3426 #ifdef SUPPORT_TLS
3427 if (tls_out.active >= 0)
3428 {
3429 int pid = fork();
3430 if (pid > 0) /* parent */
3431 {
3432 waitpid(pid, NULL, 0);
3433 tls_close(FALSE, FALSE);
3434 (void)close(sx.inblock.sock);
3435 continue_transport = NULL;
3436 continue_hostname = NULL;
3437 return yield;
3438 }
3439 else if (pid == 0) /* child; fork again to disconnect totally */
3440 {
3441 if ((pid = fork()))
3442 _exit(pid ? EXIT_FAILURE : EXIT_SUCCESS);
3443 smtp_proxy_tls(sx.buffer, sizeof(sx.buffer), pfd[0], sx.ob->command_timeout);
3444 exim_exit(0);
3445 }
3446 }
3447 #endif
3448 }
3449 }
3450
3451 /* If RSET failed and there are addresses left, they get deferred. */
3452 else
3453 set_errno(sx.first_addr, errno, msg, DEFER, FALSE, host
3454 #ifdef EXPERIMENTAL_DSN_INFO
3455 , sx.smtp_greeting, sx.helo_response
3456 #endif
3457 );
3458 }
3459 }
3460
3461 /* End off tidily with QUIT unless the connection has died or the socket has
3462 been passed to another process. There has been discussion on the net about what
3463 to do after sending QUIT. The wording of the RFC suggests that it is necessary
3464 to wait for a response, but on the other hand, there isn't anything one can do
3465 with an error response, other than log it. Exim used to do that. However,
3466 further discussion suggested that it is positively advantageous not to wait for
3467 the response, but to close the session immediately. This is supposed to move
3468 the TCP/IP TIME_WAIT state from the server to the client, thereby removing some
3469 load from the server. (Hosts that are both servers and clients may not see much
3470 difference, of course.) Further discussion indicated that this was safe to do
3471 on Unix systems which have decent implementations of TCP/IP that leave the
3472 connection around for a while (TIME_WAIT) after the application has gone away.
3473 This enables the response sent by the server to be properly ACKed rather than
3474 timed out, as can happen on broken TCP/IP implementations on other OS.
3475
3476 This change is being made on 31-Jul-98. After over a year of trouble-free
3477 operation, the old commented-out code was removed on 17-Sep-99. */
3478
3479 SEND_QUIT:
3480 if (sx.send_quit) (void)smtp_write_command(&sx.outblock, SCMD_FLUSH, "QUIT\r\n");
3481
3482 END_OFF:
3483
3484 #ifdef SUPPORT_TLS
3485 tls_close(FALSE, TRUE);
3486 #endif
3487
3488 /* Close the socket, and return the appropriate value, first setting
3489 works because the NULL setting is passed back to the calling process, and
3490 remote_max_parallel is forced to 1 when delivering over an existing connection,
3491
3492 If all went well and continue_more is set, we shouldn't actually get here if
3493 there are further addresses, as the return above will be taken. However,
3494 writing RSET might have failed, or there may be other addresses whose hosts are
3495 specified in the transports, and therefore not visible at top level, in which
3496 case continue_more won't get set. */
3497
3498 HDEBUG(D_transport|D_acl|D_v) debug_printf_indent(" SMTP(close)>>\n");
3499 if (sx.send_quit)
3500 {
3501 shutdown(sx.outblock.sock, SHUT_WR);
3502 if (fcntl(sx.inblock.sock, F_SETFL, O_NONBLOCK) == 0)
3503 for (rc = 16; read(sx.inblock.sock, sx.inbuffer, sizeof(sx.inbuffer)) > 0 && rc > 0;)
3504 rc--; /* drain socket */
3505 }
3506 (void)close(sx.inblock.sock);
3507
3508 #ifndef DISABLE_EVENT
3509 (void) event_raise(tblock->event_action, US"tcp:close", NULL);
3510 #endif
3511
3512 continue_transport = NULL;
3513 continue_hostname = NULL;
3514 return yield;
3515 }
3516
3517
3518
3519
3520 /*************************************************
3521 * Closedown entry point *
3522 *************************************************/
3523
3524 /* This function is called when exim is passed an open smtp channel
3525 from another incarnation, but the message which it has been asked
3526 to deliver no longer exists. The channel is on stdin.
3527
3528 We might do fancy things like looking for another message to send down
3529 the channel, but if the one we sought has gone, it has probably been
3530 delivered by some other process that itself will seek further messages,
3531 so just close down our connection.
3532
3533 Argument: pointer to the transport instance block
3534 Returns: nothing
3535 */
3536
3537 void
3538 smtp_transport_closedown(transport_instance *tblock)
3539 {
3540 smtp_transport_options_block *ob =
3541 (smtp_transport_options_block *)tblock->options_block;
3542 smtp_inblock inblock;
3543 smtp_outblock outblock;
3544 uschar buffer[256];
3545 uschar inbuffer[4096];
3546 uschar outbuffer[16];
3547
3548 inblock.sock = fileno(stdin);
3549 inblock.buffer = inbuffer;
3550 inblock.buffersize = sizeof(inbuffer);
3551 inblock.ptr = inbuffer;
3552 inblock.ptrend = inbuffer;
3553
3554 outblock.sock = inblock.sock;
3555 outblock.buffersize = sizeof(outbuffer);
3556 outblock.buffer = outbuffer;
3557 outblock.ptr = outbuffer;
3558 outblock.cmd_count = 0;
3559 outblock.authenticating = FALSE;
3560
3561 (void)smtp_write_command(&outblock, SCMD_FLUSH, "QUIT\r\n");
3562 (void)smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
3563 ob->command_timeout);
3564 (void)close(inblock.sock);
3565 }
3566
3567
3568
3569 /*************************************************
3570 * Prepare addresses for delivery *
3571 *************************************************/
3572
3573 /* This function is called to flush out error settings from previous delivery
3574 attempts to other hosts. It also records whether we got here via an MX record
3575 or not in the more_errno field of the address. We are interested only in
3576 addresses that are still marked DEFER - others may have got delivered to a
3577 previously considered IP address. Set their status to PENDING_DEFER to indicate
3578 which ones are relevant this time.
3579
3580 Arguments:
3581 addrlist the list of addresses
3582 host the host we are delivering to
3583
3584 Returns: the first address for this delivery
3585 */
3586
3587 static address_item *
3588 prepare_addresses(address_item *addrlist, host_item *host)
3589 {
3590 address_item *first_addr = NULL;
3591 address_item *addr;
3592 for (addr = addrlist; addr; addr = addr->next)
3593 if (addr->transport_return == DEFER)
3594 {
3595 if (!first_addr) first_addr = addr;
3596 addr->transport_return = PENDING_DEFER;
3597 addr->basic_errno = 0;
3598 addr->more_errno = (host->mx >= 0)? 'M' : 'A';
3599 addr->message = NULL;
3600 #ifdef SUPPORT_TLS
3601 addr->cipher = NULL;
3602 addr->ourcert = NULL;
3603 addr->peercert = NULL;
3604 addr->peerdn = NULL;
3605 addr->ocsp = OCSP_NOT_REQ;
3606 #endif
3607 #ifdef EXPERIMENTAL_DSN_INFO
3608 addr->smtp_greeting = NULL;
3609 addr->helo_response = NULL;
3610 #endif
3611 }
3612 return first_addr;
3613 }
3614
3615
3616
3617 /*************************************************
3618 * Main entry point *
3619 *************************************************/
3620
3621 /* See local README for interface details. As this is a remote transport, it is
3622 given a chain of addresses to be delivered in one connection, if possible. It
3623 always returns TRUE, indicating that each address has its own independent
3624 status set, except if there is a setting up problem, in which case it returns
3625 FALSE. */
3626
3627 BOOL
3628 smtp_transport_entry(
3629 transport_instance *tblock, /* data for this instantiation */
3630 address_item *addrlist) /* addresses we are working on */
3631 {
3632 int cutoff_retry;
3633 int port;
3634 int hosts_defer = 0;
3635 int hosts_fail = 0;
3636 int hosts_looked_up = 0;
3637 int hosts_retry = 0;
3638 int hosts_serial = 0;
3639 int hosts_total = 0;
3640 int total_hosts_tried = 0;
3641 address_item *addr;
3642 BOOL expired = TRUE;
3643 uschar *expanded_hosts = NULL;
3644 uschar *pistring;
3645 uschar *tid = string_sprintf("%s transport", tblock->name);
3646 smtp_transport_options_block *ob =
3647 (smtp_transport_options_block *)(tblock->options_block);
3648 host_item *hostlist = addrlist->host_list;
3649 host_item *host = NULL;
3650
3651 DEBUG(D_transport)
3652 {
3653 debug_printf("%s transport entered\n", tblock->name);
3654 for (addr = addrlist; addr; addr = addr->next)
3655 debug_printf(" %s\n", addr->address);
3656 if (hostlist)
3657 {
3658 debug_printf("hostlist:\n");
3659 for (host = hostlist; host; host = host->next)
3660 debug_printf(" %s:%d\n", host->name, host->port);
3661 }
3662 if (continue_hostname)
3663 debug_printf("already connected to %s [%s] (on fd %d)\n",
3664 continue_hostname, continue_host_address,
3665 cutthrough.fd >= 0 ? cutthrough.fd : 0);
3666 }
3667
3668 /* Set the flag requesting that these hosts be added to the waiting
3669 database if the delivery fails temporarily or if we are running with
3670 queue_smtp or a 2-stage queue run. This gets unset for certain
3671 kinds of error, typically those that are specific to the message. */
3672
3673 update_waiting = TRUE;
3674
3675 /* If a host list is not defined for the addresses - they must all have the
3676 same one in order to be passed to a single transport - or if the transport has
3677 a host list with hosts_override set, use the host list supplied with the
3678 transport. It is an error for this not to exist. */
3679
3680 if (!hostlist || (ob->hosts_override && ob->hosts))
3681 {
3682 if (!ob->hosts)
3683 {
3684 addrlist->message = string_sprintf("%s transport called with no hosts set",
3685 tblock->name);
3686 addrlist->transport_return = PANIC;
3687 return FALSE; /* Only top address has status */
3688 }
3689
3690 DEBUG(D_transport) debug_printf("using the transport's hosts: %s\n",
3691 ob->hosts);
3692
3693 /* If the transport's host list contains no '$' characters, and we are not
3694 randomizing, it is fixed and therefore a chain of hosts can be built once
3695 and for all, and remembered for subsequent use by other calls to this
3696 transport. If, on the other hand, the host list does contain '$', or we are
3697 randomizing its order, we have to rebuild it each time. In the fixed case,
3698 as the hosts string will never be used again, it doesn't matter that we
3699 replace all the : characters with zeros. */
3700
3701 if (!ob->hostlist)
3702 {
3703 uschar *s = ob->hosts;
3704
3705 if (Ustrchr(s, '$') != NULL)
3706 {
3707 if (!(expanded_hosts = expand_string(s)))
3708 {
3709 addrlist->message = string_sprintf("failed to expand list of hosts "
3710 "\"%s\" in %s transport: %s", s, tblock->name, expand_string_message);
3711 addrlist->transport_return = search_find_defer ? DEFER : PANIC;
3712 return FALSE; /* Only top address has status */
3713 }
3714 DEBUG(D_transport) debug_printf("expanded list of hosts \"%s\" to "
3715 "\"%s\"\n", s, expanded_hosts);
3716 s = expanded_hosts;
3717 }
3718 else
3719 if (ob->hosts_randomize) s = expanded_hosts = string_copy(s);
3720
3721 host_build_hostlist(&hostlist, s, ob->hosts_randomize);
3722
3723 /* Check that the expansion yielded something useful. */
3724 if (!hostlist)
3725 {
3726 addrlist->message =
3727 string_sprintf("%s transport has empty hosts setting", tblock->name);
3728 addrlist->transport_return = PANIC;
3729 return FALSE; /* Only top address has status */
3730 }
3731
3732 /* If there was no expansion of hosts, save the host list for
3733 next time. */
3734
3735 if (!expanded_hosts) ob->hostlist = hostlist;
3736 }
3737
3738 /* This is not the first time this transport has been run in this delivery;
3739 the host list was built previously. */
3740
3741 else
3742 hostlist = ob->hostlist;
3743 }
3744
3745 /* The host list was supplied with the address. If hosts_randomize is set, we
3746 must sort it into a random order if it did not come from MX records and has not
3747 already been randomized (but don't bother if continuing down an existing
3748 connection). */
3749
3750 else if (ob->hosts_randomize && hostlist->mx == MX_NONE && !continue_hostname)
3751 {
3752 host_item *newlist = NULL;
3753 while (hostlist)
3754 {
3755 host_item *h = hostlist;
3756 hostlist = hostlist->next;
3757
3758 h->sort_key = random_number(100);
3759
3760 if (!newlist)
3761 {
3762 h->next = NULL;
3763 newlist = h;
3764 }
3765 else if (h->sort_key < newlist->sort_key)
3766 {
3767 h->next = newlist;
3768 newlist = h;
3769 }
3770 else
3771 {
3772 host_item *hh = newlist;
3773 while (hh->next)
3774 {
3775 if (h->sort_key < hh->next->sort_key) break;
3776 hh = hh->next;
3777 }
3778 h->next = hh->next;
3779 hh->next = h;
3780 }
3781 }
3782
3783 hostlist = addrlist->host_list = newlist;
3784 }
3785
3786 /* Sort out the default port. */
3787
3788 if (!smtp_get_port(ob->port, addrlist, &port, tid)) return FALSE;
3789
3790 /* For each host-plus-IP-address on the list:
3791
3792 . If this is a continued delivery and the host isn't the one with the
3793 current connection, skip.
3794
3795 . If the status is unusable (i.e. previously failed or retry checked), skip.
3796
3797 . If no IP address set, get the address, either by turning the name into
3798 an address, calling gethostbyname if gethostbyname is on, or by calling
3799 the DNS. The DNS may yield multiple addresses, in which case insert the
3800 extra ones into the list.
3801
3802 . Get the retry data if not previously obtained for this address and set the
3803 field which remembers the state of this address. Skip if the retry time is
3804 not reached. If not, remember whether retry data was found. The retry string
3805 contains both the name and the IP address.
3806
3807 . Scan the list of addresses and mark those whose status is DEFER as
3808 PENDING_DEFER. These are the only ones that will be processed in this cycle
3809 of the hosts loop.
3810
3811 . Make a delivery attempt - addresses marked PENDING_DEFER will be tried.
3812 Some addresses may be successfully delivered, others may fail, and yet
3813 others may get temporary errors and so get marked DEFER.
3814
3815 . The return from the delivery attempt is OK if a connection was made and a
3816 valid SMTP dialogue was completed. Otherwise it is DEFER.
3817
3818 . If OK, add a "remove" retry item for this host/IPaddress, if any.
3819
3820 . If fail to connect, or other defer state, add a retry item.
3821
3822 . If there are any addresses whose status is still DEFER, carry on to the
3823 next host/IPaddress, unless we have tried the number of hosts given
3824 by hosts_max_try or hosts_max_try_hardlimit; otherwise return. Note that
3825 there is some fancy logic for hosts_max_try that means its limit can be
3826 overstepped in some circumstances.
3827
3828 If we get to the end of the list, all hosts have deferred at least one address,
3829 or not reached their retry times. If delay_after_cutoff is unset, it requests a
3830 delivery attempt to those hosts whose last try was before the arrival time of
3831 the current message. To cope with this, we have to go round the loop a second
3832 time. After that, set the status and error data for any addresses that haven't
3833 had it set already. */
3834
3835 for (cutoff_retry = 0;
3836 expired && cutoff_retry < (ob->delay_after_cutoff ? 1 : 2);
3837 cutoff_retry++)
3838 {
3839 host_item *nexthost = NULL;
3840 int unexpired_hosts_tried = 0;
3841
3842 for (host = hostlist;
3843 host
3844 && unexpired_hosts_tried < ob->hosts_max_try
3845 && total_hosts_tried < ob->hosts_max_try_hardlimit;
3846 host = nexthost)
3847 {
3848 int rc;
3849 int host_af;
3850 uschar *rs;
3851 BOOL host_is_expired = FALSE;
3852 BOOL message_defer = FALSE;
3853 BOOL some_deferred = FALSE;
3854 address_item *first_addr = NULL;
3855 uschar *interface = NULL;
3856 uschar *retry_host_key = NULL;
3857 uschar *retry_message_key = NULL;
3858 uschar *serialize_key = NULL;
3859
3860 /* Default next host is next host. :-) But this can vary if the
3861 hosts_max_try limit is hit (see below). It may also be reset if a host
3862 address is looked up here (in case the host was multihomed). */
3863
3864 nexthost = host->next;
3865
3866 /* If the address hasn't yet been obtained from the host name, look it up
3867 now, unless the host is already marked as unusable. If it is marked as
3868 unusable, it means that the router was unable to find its IP address (in
3869 the DNS or wherever) OR we are in the 2nd time round the cutoff loop, and
3870 the lookup failed last time. We don't get this far if *all* MX records
3871 point to non-existent hosts; that is treated as a hard error.
3872
3873 We can just skip this host entirely. When the hosts came from the router,
3874 the address will timeout based on the other host(s); when the address is
3875 looked up below, there is an explicit retry record added.
3876
3877 Note that we mustn't skip unusable hosts if the address is not unset; they
3878 may be needed as expired hosts on the 2nd time round the cutoff loop. */
3879
3880 if (!host->address)
3881 {
3882 int new_port, flags;
3883 host_item *hh;
3884
3885 if (host->status >= hstatus_unusable)
3886 {
3887 DEBUG(D_transport) debug_printf("%s has no address and is unusable - skipping\n",
3888 host->name);
3889 continue;
3890 }
3891
3892 DEBUG(D_transport) debug_printf("getting address for %s\n", host->name);
3893
3894 /* The host name is permitted to have an attached port. Find it, and
3895 strip it from the name. Just remember it for now. */
3896
3897 new_port = host_item_get_port(host);
3898
3899 /* Count hosts looked up */
3900
3901 hosts_looked_up++;
3902
3903 /* Find by name if so configured, or if it's an IP address. We don't
3904 just copy the IP address, because we need the test-for-local to happen. */
3905
3906 flags = HOST_FIND_BY_A;
3907 if (ob->dns_qualify_single) flags |= HOST_FIND_QUALIFY_SINGLE;
3908 if (ob->dns_search_parents) flags |= HOST_FIND_SEARCH_PARENTS;
3909
3910 if (ob->gethostbyname || string_is_ip_address(host->name, NULL) != 0)
3911 rc = host_find_byname(host, NULL, flags, NULL, TRUE);
3912 else
3913 rc = host_find_bydns(host, NULL, flags, NULL, NULL, NULL,
3914 &ob->dnssec, /* domains for request/require */
3915 NULL, NULL);
3916
3917 /* Update the host (and any additional blocks, resulting from
3918 multihoming) with a host-specific port, if any. */
3919
3920 for (hh = host; hh != nexthost; hh = hh->next) hh->port = new_port;
3921
3922 /* Failure to find the host at this time (usually DNS temporary failure)
3923 is really a kind of routing failure rather than a transport failure.
3924 Therefore we add a retry item of the routing kind, not to stop us trying
3925 to look this name up here again, but to ensure the address gets timed
3926 out if the failures go on long enough. A complete failure at this point
3927 commonly points to a configuration error, but the best action is still
3928 to carry on for the next host. */
3929
3930 if (rc == HOST_FIND_AGAIN || rc == HOST_FIND_SECURITY || rc == HOST_FIND_FAILED)
3931 {
3932 retry_add_item(addrlist, string_sprintf("R:%s", host->name), 0);
3933 expired = FALSE;
3934 if (rc == HOST_FIND_AGAIN) hosts_defer++; else hosts_fail++;
3935 DEBUG(D_transport) debug_printf("rc = %s for %s\n", (rc == HOST_FIND_AGAIN)?
3936 "HOST_FIND_AGAIN" : "HOST_FIND_FAILED", host->name);
3937 host->status = hstatus_unusable;
3938
3939 for (addr = addrlist; addr; addr = addr->next)
3940 {
3941 if (addr->transport_return != DEFER) continue;
3942 addr->basic_errno = ERRNO_UNKNOWNHOST;
3943 addr->message = string_sprintf(
3944 rc == HOST_FIND_SECURITY
3945 ? "lookup of IP address for %s was insecure"
3946 : "failed to lookup IP address for %s",
3947 host->name);
3948 }
3949 continue;
3950 }
3951
3952 /* If the host is actually the local host, we may have a problem, or
3953 there may be some cunning configuration going on. In the problem case,
3954 log things and give up. The default transport status is already DEFER. */
3955
3956 if (rc == HOST_FOUND_LOCAL && !ob->allow_localhost)
3957 {
3958 for (addr = addrlist; addr; addr = addr->next)
3959 {
3960 addr->basic_errno = 0;
3961 addr->message = string_sprintf("%s transport found host %s to be "
3962 "local", tblock->name, host->name);
3963 }
3964 goto END_TRANSPORT;
3965 }
3966 } /* End of block for IP address lookup */
3967
3968 /* If this is a continued delivery, we are interested only in the host
3969 which matches the name of the existing open channel. The check is put
3970 here after the local host lookup, in case the name gets expanded as a
3971 result of the lookup. Set expired FALSE, to save the outer loop executing
3972 twice. */
3973
3974 if ( continue_hostname
3975 && ( Ustrcmp(continue_hostname, host->name) != 0
3976 || Ustrcmp(continue_host_address, host->address) != 0
3977 ) )
3978 {
3979 expired = FALSE;
3980 continue; /* With next host */
3981 }
3982
3983 /* Reset the default next host in case a multihomed host whose addresses
3984 are not looked up till just above added to the host list. */
3985
3986 nexthost = host->next;
3987
3988 /* If queue_smtp is set (-odqs or the first part of a 2-stage run), or the
3989 domain is in queue_smtp_domains, we don't actually want to attempt any
3990 deliveries. When doing a queue run, queue_smtp_domains is always unset. If
3991 there is a lookup defer in queue_smtp_domains, proceed as if the domain
3992 were not in it. We don't want to hold up all SMTP deliveries! Except when
3993 doing a two-stage queue run, don't do this if forcing. */
3994
3995 if ((!deliver_force || queue_2stage) && (queue_smtp ||
3996 match_isinlist(addrlist->domain,
3997 (const uschar **)&queue_smtp_domains, 0,
3998 &domainlist_anchor, NULL, MCL_DOMAIN, TRUE, NULL) == OK))
3999 {
4000 expired = FALSE;
4001 for (addr = addrlist; addr; addr = addr->next)
4002 if (addr->transport_return == DEFER)
4003 addr->message = US"domain matches queue_smtp_domains, or -odqs set";
4004 continue; /* With next host */
4005 }
4006
4007 /* Count hosts being considered - purely for an intelligent comment
4008 if none are usable. */
4009
4010 hosts_total++;
4011
4012 /* Set $host and $host address now in case they are needed for the
4013 interface expansion or the serialize_hosts check; they remain set if an
4014 actual delivery happens. */
4015
4016 deliver_host = host->name;
4017 deliver_host_address = host->address;
4018 lookup_dnssec_authenticated = host->dnssec == DS_YES ? US"yes"
4019 : host->dnssec == DS_NO ? US"no"
4020 : US"";
4021
4022 /* Set up a string for adding to the retry key if the port number is not
4023 the standard SMTP port. A host may have its own port setting that overrides
4024 the default. */
4025
4026 pistring = string_sprintf(":%d", host->port == PORT_NONE
4027 ? port : host->port);
4028 if (Ustrcmp(pistring, ":25") == 0) pistring = US"";
4029
4030 /* Select IPv4 or IPv6, and choose an outgoing interface. If the interface
4031 string is set, even if constant (as different transports can have different
4032 constant settings), we must add it to the key that is used for retries,
4033 because connections to the same host from a different interface should be
4034 treated separately. */
4035
4036 host_af = Ustrchr(host->address, ':') == NULL ? AF_INET : AF_INET6;
4037 if ((rs = ob->interface) && *rs)
4038 {
4039 if (!smtp_get_interface(rs, host_af, addrlist, &interface, tid))
4040 return FALSE;
4041 pistring = string_sprintf("%s/%s", pistring, interface);
4042 }
4043
4044 /* The first time round the outer loop, check the status of the host by
4045 inspecting the retry data. The second time round, we are interested only
4046 in expired hosts that haven't been tried since this message arrived. */
4047
4048 if (cutoff_retry == 0)
4049 {
4050 BOOL incl_ip;
4051 /* Ensure the status of the address is set by checking retry data if
4052 necessary. There may be host-specific retry data (applicable to all
4053 messages) and also data for retries of a specific message at this host.
4054 If either of these retry records are actually read, the keys used are
4055 returned to save recomputing them later. */
4056
4057 if (exp_bool(addrlist, US"transport", tblock->name, D_transport,
4058 US"retry_include_ip_address", ob->retry_include_ip_address,
4059 ob->expand_retry_include_ip_address, &incl_ip) != OK)
4060 continue; /* with next host */
4061
4062 host_is_expired = retry_check_address(addrlist->domain, host, pistring,
4063 incl_ip, &retry_host_key, &retry_message_key);
4064
4065 DEBUG(D_transport) debug_printf("%s [%s]%s retry-status = %s\n", host->name,
4066 (host->address == NULL)? US"" : host->address, pistring,
4067 (host->status == hstatus_usable)? "usable" :
4068 (host->status == hstatus_unusable)? "unusable" :
4069 (host->status == hstatus_unusable_expired)? "unusable (expired)" : "?");
4070
4071 /* Skip this address if not usable at this time, noting if it wasn't
4072 actually expired, both locally and in the address. */
4073
4074 switch (host->status)
4075 {
4076 case hstatus_unusable:
4077 expired = FALSE;
4078 setflag(addrlist, af_retry_skipped);
4079 /* Fall through */
4080
4081 case hstatus_unusable_expired:
4082 switch (host->why)
4083 {
4084 case hwhy_retry: hosts_retry++; break;
4085 case hwhy_failed: hosts_fail++; break;
4086 case hwhy_insecure:
4087 case hwhy_deferred: hosts_defer++; break;
4088 }
4089
4090 /* If there was a retry message key, implying that previously there
4091 was a message-specific defer, we don't want to update the list of
4092 messages waiting for these hosts. */
4093
4094 if (retry_message_key) update_waiting = FALSE;
4095 continue; /* With the next host or IP address */
4096 }
4097 }
4098
4099 /* Second time round the loop: if the address is set but expired, and
4100 the message is newer than the last try, let it through. */
4101
4102 else
4103 {
4104 if ( !host->address
4105 || host->status != hstatus_unusable_expired
4106 || host->last_try > received_time)
4107 continue;
4108 DEBUG(D_transport) debug_printf("trying expired host %s [%s]%s\n",
4109 host->name, host->address, pistring);
4110 host_is_expired = TRUE;
4111 }
4112
4113 /* Setting "expired=FALSE" doesn't actually mean not all hosts are expired;
4114 it remains TRUE only if all hosts are expired and none are actually tried.
4115 */
4116
4117 expired = FALSE;
4118
4119 /* If this host is listed as one to which access must be serialized,
4120 see if another Exim process has a connection to it, and if so, skip
4121 this host. If not, update the database to record our connection to it
4122 and remember this for later deletion. Do not do any of this if we are
4123 sending the message down a pre-existing connection. */
4124
4125 if ( !continue_hostname
4126 && verify_check_given_host(&ob->serialize_hosts, host) == OK)
4127 {
4128 serialize_key = string_sprintf("host-serialize-%s", host->name);
4129 if (!enq_start(serialize_key, 1))
4130 {
4131 DEBUG(D_transport)
4132 debug_printf("skipping host %s because another Exim process "
4133 "is connected to it\n", host->name);
4134 hosts_serial++;
4135 continue;
4136 }
4137 }
4138
4139 /* OK, we have an IP address that is not waiting for its retry time to
4140 arrive (it might be expired) OR (second time round the loop) we have an
4141 expired host that hasn't been tried since the message arrived. Have a go
4142 at delivering the message to it. First prepare the addresses by flushing
4143 out the result of previous attempts, and finding the first address that
4144 is still to be delivered. */
4145
4146 first_addr = prepare_addresses(addrlist, host);
4147
4148 DEBUG(D_transport) debug_printf("delivering %s to %s [%s] (%s%s)\n",
4149 message_id, host->name, host->address, addrlist->address,
4150 addrlist->next ? ", ..." : "");
4151
4152 set_process_info("delivering %s to %s [%s] (%s%s)",
4153 message_id, host->name, host->address, addrlist->address,
4154 addrlist->next ? ", ..." : "");
4155
4156 /* This is not for real; don't do the delivery. If there are
4157 any remaining hosts, list them. */
4158
4159 if (dont_deliver)
4160 {
4161 host_item *host2;
4162 set_errno_nohost(addrlist, 0, NULL, OK, FALSE);
4163 for (addr = addrlist; addr; addr = addr->next)
4164 {
4165 addr->host_used = host;
4166 addr->special_action = '*';
4167 addr->message = US"delivery bypassed by -N option";
4168 }
4169 DEBUG(D_transport)
4170 {
4171 debug_printf("*** delivery by %s transport bypassed by -N option\n"
4172 "*** host and remaining hosts:\n", tblock->name);
4173 for (host2 = host; host2; host2 = host2->next)
4174 debug_printf(" %s [%s]\n", host2->name,
4175 host2->address ? host2->address : US"unset");
4176 }
4177 rc = OK;
4178 }
4179
4180 /* This is for real. If the host is expired, we don't count it for
4181 hosts_max_retry. This ensures that all hosts must expire before an address
4182 is timed out, unless hosts_max_try_hardlimit (which protects against
4183 lunatic DNS configurations) is reached.
4184
4185 If the host is not expired and we are about to hit the hosts_max_retry
4186 limit, check to see if there is a subsequent hosts with a different MX
4187 value. If so, make that the next host, and don't count this one. This is a
4188 heuristic to make sure that different MXs do get tried. With a normal kind
4189 of retry rule, they would get tried anyway when the earlier hosts were
4190 delayed, but if the domain has a "retry every time" type of rule - as is
4191 often used for the the very large ISPs, that won't happen. */
4192
4193 else
4194 {
4195 host_item * thost;
4196 /* Make a copy of the host if it is local to this invocation
4197 of the transport. */
4198
4199 if (expanded_hosts)
4200 {
4201 thost = store_get(sizeof(host_item));
4202 *thost = *host;
4203 thost->name = string_copy(host->name);
4204 thost->address = string_copy(host->address);
4205 }
4206 else
4207 thost = host;
4208
4209 if (!host_is_expired && ++unexpired_hosts_tried >= ob->hosts_max_try)
4210 {
4211 host_item *h;
4212 DEBUG(D_transport)
4213 debug_printf("hosts_max_try limit reached with this host\n");
4214 for (h = host; h; h = h->next) if (h->mx != host->mx)
4215 {
4216 nexthost = h;
4217 unexpired_hosts_tried--;
4218 DEBUG(D_transport) debug_printf("however, a higher MX host exists "
4219 "and will be tried\n");
4220 break;
4221 }
4222 }
4223
4224 /* Attempt the delivery. */
4225
4226 total_hosts_tried++;
4227 rc = smtp_deliver(addrlist, thost, host_af, port, interface, tblock,
4228 &message_defer, FALSE);
4229
4230 /* Yield is one of:
4231 OK => connection made, each address contains its result;
4232 message_defer is set for message-specific defers (when all
4233 recipients are marked defer)
4234 DEFER => there was a non-message-specific delivery problem;
4235 ERROR => there was a problem setting up the arguments for a filter,
4236 or there was a problem with expanding added headers
4237 */
4238
4239 /* If the result is not OK, there was a non-message-specific problem.
4240 If the result is DEFER, we need to write to the logs saying what happened
4241 for this particular host, except in the case of authentication and TLS
4242 failures, where the log has already been written. If all hosts defer a
4243 general message is written at the end. */
4244
4245 if (rc == DEFER && first_addr->basic_errno != ERRNO_AUTHFAIL
4246 && first_addr->basic_errno != ERRNO_TLSFAILURE)
4247 write_logs(first_addr, host);
4248
4249 #ifndef DISABLE_EVENT
4250 if (rc == DEFER)
4251 deferred_event_raise(first_addr, host);
4252 #endif
4253
4254 /* If STARTTLS was accepted, but there was a failure in setting up the
4255 TLS session (usually a certificate screwup), and the host is not in
4256 hosts_require_tls, and tls_tempfail_tryclear is true, try again, with
4257 TLS forcibly turned off. We have to start from scratch with a new SMTP
4258 connection. That's why the retry is done from here, not from within
4259 smtp_deliver(). [Rejections of STARTTLS itself don't screw up the
4260 session, so the in-clear transmission after those errors, if permitted,
4261 happens inside smtp_deliver().] */
4262
4263 #ifdef SUPPORT_TLS
4264 if ( rc == DEFER
4265 && first_addr->basic_errno == ERRNO_TLSFAILURE
4266 && ob->tls_tempfail_tryclear
4267 && verify_check_given_host(&ob->hosts_require_tls, host) != OK
4268 )
4269 {
4270 log_write(0, LOG_MAIN,
4271 "%s: delivering unencrypted to H=%s [%s] (not in hosts_require_tls)",
4272 first_addr->message, host->name, host->address);
4273 first_addr = prepare_addresses(addrlist, host);
4274 rc = smtp_deliver(addrlist, thost, host_af, port, interface, tblock,
4275 &message_defer, TRUE);
4276 if (rc == DEFER && first_addr->basic_errno != ERRNO_AUTHFAIL)
4277 write_logs(first_addr, host);
4278 # ifndef DISABLE_EVENT
4279 if (rc == DEFER)
4280 deferred_event_raise(first_addr, host);
4281 # endif
4282 }
4283 #endif /*SUPPORT_TLS*/
4284 }
4285
4286 /* Delivery attempt finished */
4287
4288 rs = rc == OK ? US"OK"
4289 : rc == DEFER ? US"DEFER"
4290 : rc == ERROR ? US"ERROR"
4291 : US"?";
4292
4293 set_process_info("delivering %s: just tried %s [%s] for %s%s: result %s",
4294 message_id, host->name, host->address, addrlist->address,
4295 addrlist->next ? " (& others)" : "", rs);
4296
4297 /* Release serialization if set up */
4298
4299 if (serialize_key) enq_end(serialize_key);
4300
4301 /* If the result is DEFER, or if a host retry record is known to exist, we
4302 need to add an item to the retry chain for updating the retry database
4303 at the end of delivery. We only need to add the item to the top address,
4304 of course. Also, if DEFER, we mark the IP address unusable so as to skip it
4305 for any other delivery attempts using the same address. (It is copied into
4306 the unusable tree at the outer level, so even if different address blocks
4307 contain the same address, it still won't get tried again.) */
4308
4309 if (rc == DEFER || retry_host_key)
4310 {
4311 int delete_flag = rc != DEFER ? rf_delete : 0;
4312 if (!retry_host_key)
4313 {
4314 BOOL incl_ip;
4315 if (exp_bool(addrlist, US"transport", tblock->name, D_transport,
4316 US"retry_include_ip_address", ob->retry_include_ip_address,
4317 ob->expand_retry_include_ip_address, &incl_ip) != OK)
4318 incl_ip = TRUE; /* error; use most-specific retry record */
4319
4320 retry_host_key = incl_ip
4321 ? string_sprintf("T:%S:%s%s", host->name, host->address, pistring)
4322 : string_sprintf("T:%S%s", host->name, pistring);
4323 }
4324
4325 /* If a delivery of another message over an existing SMTP connection
4326 yields DEFER, we do NOT set up retry data for the host. This covers the
4327 case when there are delays in routing the addresses in the second message
4328 that are so long that the server times out. This is alleviated by not
4329 routing addresses that previously had routing defers when handling an
4330 existing connection, but even so, this case may occur (e.g. if a
4331 previously happily routed address starts giving routing defers). If the
4332 host is genuinely down, another non-continued message delivery will
4333 notice it soon enough. */
4334
4335 if (delete_flag != 0 || !continue_hostname)
4336 retry_add_item(first_addr, retry_host_key, rf_host | delete_flag);
4337
4338 /* We may have tried an expired host, if its retry time has come; ensure
4339 the status reflects the expiry for the benefit of any other addresses. */
4340
4341 if (rc == DEFER)
4342 {
4343 host->status = host_is_expired
4344 ? hstatus_unusable_expired : hstatus_unusable;
4345 host->why = hwhy_deferred;
4346 }
4347 }
4348
4349 /* If message_defer is set (host was OK, but every recipient got deferred
4350 because of some message-specific problem), or if that had happened
4351 previously so that a message retry key exists, add an appropriate item
4352 to the retry chain. Note that if there was a message defer but now there is
4353 a host defer, the message defer record gets deleted. That seems perfectly
4354 reasonable. Also, stop the message from being remembered as waiting
4355 for specific hosts. */
4356
4357 if (message_defer || retry_message_key)
4358 {
4359 int delete_flag = message_defer ? 0 : rf_delete;
4360 if (!retry_message_key)
4361 {
4362 BOOL incl_ip;
4363 if (exp_bool(addrlist, US"transport", tblock->name, D_transport,
4364 US"retry_include_ip_address", ob->retry_include_ip_address,
4365 ob->expand_retry_include_ip_address, &incl_ip) != OK)
4366 incl_ip = TRUE; /* error; use most-specific retry record */
4367
4368 retry_message_key = incl_ip
4369 ? string_sprintf("T:%S:%s%s:%s", host->name, host->address, pistring,
4370 message_id)
4371 : string_sprintf("T:%S%s:%s", host->name, pistring, message_id);
4372 }
4373 retry_add_item(addrlist, retry_message_key,
4374 rf_message | rf_host | delete_flag);
4375 update_waiting = FALSE;
4376 }
4377
4378 /* Any return other than DEFER (that is, OK or ERROR) means that the
4379 addresses have got their final statuses filled in for this host. In the OK
4380 case, see if any of them are deferred. */
4381
4382 if (rc == OK)
4383 for (addr = addrlist; addr; addr = addr->next)
4384 if (addr->transport_return == DEFER)
4385 {
4386 some_deferred = TRUE;
4387 break;
4388 }
4389
4390 /* If no addresses deferred or the result was ERROR, return. We do this for
4391 ERROR because a failing filter set-up or add_headers expansion is likely to
4392 fail for any host we try. */
4393
4394 if (rc == ERROR || (rc == OK && !some_deferred))
4395 {
4396 DEBUG(D_transport) debug_printf("Leaving %s transport\n", tblock->name);
4397 return TRUE; /* Each address has its status */
4398 }
4399
4400 /* If the result was DEFER or some individual addresses deferred, let
4401 the loop run to try other hosts with the deferred addresses, except for the
4402 case when we were trying to deliver down an existing channel and failed.
4403 Don't try any other hosts in this case. */
4404
4405 if (continue_hostname) break;
4406
4407 /* If the whole delivery, or some individual addresses, were deferred and
4408 there are more hosts that could be tried, do not count this host towards
4409 the hosts_max_try limit if the age of the message is greater than the
4410 maximum retry time for this host. This means we may try try all hosts,
4411 ignoring the limit, when messages have been around for some time. This is
4412 important because if we don't try all hosts, the address will never time
4413 out. NOTE: this does not apply to hosts_max_try_hardlimit. */
4414
4415 if ((rc == DEFER || some_deferred) && nexthost)
4416 {
4417 BOOL timedout;
4418 retry_config *retry = retry_find_config(host->name, NULL, 0, 0);
4419
4420 if (retry && retry->rules)
4421 {
4422 retry_rule *last_rule;
4423 for (last_rule = retry->rules;
4424 last_rule->next;
4425 last_rule = last_rule->next);
4426 timedout = time(NULL) - received_time > last_rule->timeout;
4427 }
4428 else timedout = TRUE; /* No rule => timed out */
4429
4430 if (timedout)
4431 {
4432 unexpired_hosts_tried--;
4433 DEBUG(D_transport) debug_printf("temporary delivery error(s) override "
4434 "hosts_max_try (message older than host's retry time)\n");
4435 }
4436 }
4437 } /* End of loop for trying multiple hosts. */
4438
4439 /* This is the end of the loop that repeats iff expired is TRUE and
4440 ob->delay_after_cutoff is FALSE. The second time round we will
4441 try those hosts that haven't been tried since the message arrived. */
4442
4443 DEBUG(D_transport)
4444 {
4445 debug_printf("all IP addresses skipped or deferred at least one address\n");
4446 if (expired && !ob->delay_after_cutoff && cutoff_retry == 0)
4447 debug_printf("retrying IP addresses not tried since message arrived\n");
4448 }
4449 }
4450
4451
4452 /* Get here if all IP addresses are skipped or defer at least one address. In
4453 MUA wrapper mode, this will happen only for connection or other non-message-
4454 specific failures. Force the delivery status for all addresses to FAIL. */
4455
4456 if (mua_wrapper)
4457 {
4458 for (addr = addrlist; addr; addr = addr->next)
4459 addr->transport_return = FAIL;
4460 goto END_TRANSPORT;
4461 }
4462
4463 /* In the normal, non-wrapper case, add a standard message to each deferred
4464 address if there hasn't been an error, that is, if it hasn't actually been
4465 tried this time. The variable "expired" will be FALSE if any deliveries were
4466 actually tried, or if there was at least one host that was not expired. That
4467 is, it is TRUE only if no deliveries were tried and all hosts were expired. If
4468 a delivery has been tried, an error code will be set, and the failing of the
4469 message is handled by the retry code later.
4470
4471 If queue_smtp is set, or this transport was called to send a subsequent message
4472 down an existing TCP/IP connection, and something caused the host not to be
4473 found, we end up here, but can detect these cases and handle them specially. */
4474
4475 for (addr = addrlist; addr; addr = addr->next)
4476 {
4477 /* If host is not NULL, it means that we stopped processing the host list
4478 because of hosts_max_try or hosts_max_try_hardlimit. In the former case, this
4479 means we need to behave as if some hosts were skipped because their retry
4480 time had not come. Specifically, this prevents the address from timing out.
4481 However, if we have hit hosts_max_try_hardlimit, we want to behave as if all
4482 hosts were tried. */
4483
4484 if (host)
4485 if (total_hosts_tried >= ob->hosts_max_try_hardlimit)
4486 {
4487 DEBUG(D_transport)
4488 debug_printf("hosts_max_try_hardlimit reached: behave as if all "
4489 "hosts were tried\n");
4490 }
4491 else
4492 {
4493 DEBUG(D_transport)
4494 debug_printf("hosts_max_try limit caused some hosts to be skipped\n");
4495 setflag(addr, af_retry_skipped);
4496 }
4497
4498 if (queue_smtp) /* no deliveries attempted */
4499 {
4500 addr->transport_return = DEFER;
4501 addr->basic_errno = 0;
4502 addr->message = US"SMTP delivery explicitly queued";
4503 }
4504
4505 else if ( addr->transport_return == DEFER
4506 && (addr->basic_errno == ERRNO_UNKNOWNERROR || addr->basic_errno == 0)
4507 && !addr->message
4508 )
4509 {
4510 addr->basic_errno = ERRNO_HRETRY;
4511 if (continue_hostname)
4512 addr->message = US"no host found for existing SMTP connection";
4513 else if (expired)
4514 {
4515 setflag(addr, af_pass_message); /* This is not a security risk */
4516 addr->message = string_sprintf(
4517 "all hosts%s have been failing for a long time %s",
4518 addr->domain ? string_sprintf(" for '%s'", addr->domain) : US"",
4519 ob->delay_after_cutoff
4520 ? US"(and retry time not reached)"
4521 : US"and were last tried after this message arrived");
4522
4523 /* If we are already using fallback hosts, or there are no fallback hosts
4524 defined, convert the result to FAIL to cause a bounce. */
4525
4526 if (addr->host_list == addr->fallback_hosts || !addr->fallback_hosts)
4527 addr->transport_return = FAIL;
4528 }
4529 else
4530 {
4531 const char * s;
4532 if (hosts_retry == hosts_total)
4533 s = "retry time not reached for any host%s";
4534 else if (hosts_fail == hosts_total)
4535 s = "all host address lookups%s failed permanently";
4536 else if (hosts_defer == hosts_total)
4537 s = "all host address lookups%s failed temporarily";
4538 else if (hosts_serial == hosts_total)
4539 s = "connection limit reached for all hosts%s";
4540 else if (hosts_fail+hosts_defer == hosts_total)
4541 s = "all host address lookups%s failed";
4542 else
4543 s = "some host address lookups failed and retry time "
4544 "not reached for other hosts or connection limit reached%s";
4545
4546 addr->message = string_sprintf(s,
4547 addr->domain ? string_sprintf(" for '%s'", addr->domain) : US"");
4548 }
4549 }
4550 }
4551
4552 /* Update the database which keeps information about which messages are waiting
4553 for which hosts to become available. For some message-specific errors, the
4554 update_waiting flag is turned off because we don't want follow-on deliveries in
4555 those cases. If this transport instance is explicitly limited to one message
4556 per connection then follow-on deliveries are not possible and there's no need
4557 to create/update the per-transport wait-<transport_name> database. */
4558
4559 if (update_waiting && tblock->connection_max_messages != 1)
4560 transport_update_waiting(hostlist, tblock->name);
4561
4562 END_TRANSPORT:
4563
4564 DEBUG(D_transport) debug_printf("Leaving %s transport\n", tblock->name);
4565
4566 return TRUE; /* Each address has its status */
4567 }
4568
4569 /* vi: aw ai sw=2
4570 */
4571 /* End of transport/smtp.c */
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