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Fix continue_more on TLS connection. Bug 2104
[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
2207 HDEBUG(D_transport|D_acl|D_v) debug_printf_indent(" SMTP(close)>>\n");
2208 if (sx->send_quit)
2209 {
2210 shutdown(sx->outblock.sock, SHUT_WR);
2211 if (fcntl(sx->inblock.sock, F_SETFL, O_NONBLOCK) == 0)
2212 for (rc = 16; read(sx->inblock.sock, sx->inbuffer, sizeof(sx->inbuffer)) > 0 && rc > 0;)
2213 rc--; /* drain socket */
2214 sx->send_quit = FALSE;
2215 }
2216 (void)close(sx->inblock.sock);
2217 sx->inblock.sock = sx->outblock.sock = -1;
2218
2219 #ifndef DISABLE_EVENT
2220 (void) event_raise(sx->tblock->event_action, US"tcp:close", NULL);
2221 #endif
2222
2223 continue_transport = NULL;
2224 continue_hostname = NULL;
2225 return yield;
2226 }
2227
2228
2229
2230
2231 /* Create the string of options that will be appended to the MAIL FROM:
2232 in the connection context buffer */
2233
2234 static int
2235 build_mailcmd_options(smtp_context * sx, address_item * addrlist)
2236 {
2237 uschar * p = sx->buffer;
2238 address_item * addr;
2239 int address_count;
2240
2241 *p = 0;
2242
2243 /* If we know the receiving MTA supports the SIZE qualification,
2244 send it, adding something to the message size to allow for imprecision
2245 and things that get added en route. Exim keeps the number of lines
2246 in a message, so we can give an accurate value for the original message, but we
2247 need some additional to handle added headers. (Double "." characters don't get
2248 included in the count.) */
2249
2250 if (sx->peer_offered & PEER_OFFERED_SIZE)
2251 {
2252 /*XXX problem here under spool_files_wireformat?
2253 Or just forget about lines? Or inflate by a fixed proportion? */
2254
2255 sprintf(CS p, " SIZE=%d", message_size+message_linecount+sx->ob->size_addition);
2256 while (*p) p++;
2257 }
2258
2259 #ifndef DISABLE_PRDR
2260 /* If it supports Per-Recipient Data Reponses, and we have omre than one recipient,
2261 request that */
2262
2263 sx->prdr_active = FALSE;
2264 if (sx->peer_offered & PEER_OFFERED_PRDR)
2265 for (addr = addrlist; addr; addr = addr->next)
2266 if (addr->transport_return == PENDING_DEFER)
2267 {
2268 for (addr = addr->next; addr; addr = addr->next)
2269 if (addr->transport_return == PENDING_DEFER)
2270 { /* at least two recipients to send */
2271 sx->prdr_active = TRUE;
2272 sprintf(CS p, " PRDR"); p += 5;
2273 break;
2274 }
2275 break;
2276 }
2277 #endif
2278
2279 #ifdef SUPPORT_I18N
2280 /* If it supports internationalised messages, and this meesage need that,
2281 request it */
2282
2283 if ( sx->peer_offered & PEER_OFFERED_UTF8
2284 && addrlist->prop.utf8_msg
2285 && !addrlist->prop.utf8_downcvt
2286 )
2287 Ustrcpy(p, " SMTPUTF8"), p += 9;
2288 #endif
2289
2290 /* check if all addresses have DSN-lasthop flag; do not send RET and ENVID if so */
2291 for (sx->dsn_all_lasthop = TRUE, addr = addrlist, address_count = 0;
2292 addr && address_count < sx->max_rcpt;
2293 addr = addr->next) if (addr->transport_return == PENDING_DEFER)
2294 {
2295 address_count++;
2296 if (!(addr->dsn_flags & rf_dsnlasthop))
2297 {
2298 sx->dsn_all_lasthop = FALSE;
2299 break;
2300 }
2301 }
2302
2303 /* Add any DSN flags to the mail command */
2304
2305 if (sx->peer_offered & PEER_OFFERED_DSN && !sx->dsn_all_lasthop)
2306 {
2307 if (dsn_ret == dsn_ret_hdrs)
2308 { Ustrcpy(p, " RET=HDRS"); p += 9; }
2309 else if (dsn_ret == dsn_ret_full)
2310 { Ustrcpy(p, " RET=FULL"); p += 9; }
2311
2312 if (dsn_envid)
2313 {
2314 string_format(p, sizeof(sx->buffer) - (p-sx->buffer), " ENVID=%s", dsn_envid);
2315 while (*p) p++;
2316 }
2317 }
2318
2319 /* If an authenticated_sender override has been specified for this transport
2320 instance, expand it. If the expansion is forced to fail, and there was already
2321 an authenticated_sender for this message, the original value will be used.
2322 Other expansion failures are serious. An empty result is ignored, but there is
2323 otherwise no check - this feature is expected to be used with LMTP and other
2324 cases where non-standard addresses (e.g. without domains) might be required. */
2325
2326 if (smtp_mail_auth_str(p, sizeof(sx->buffer) - (p-sx->buffer), addrlist, sx->ob))
2327 return ERROR;
2328
2329 return OK;
2330 }
2331
2332
2333 static void
2334 build_rcptcmd_options(smtp_context * sx, const address_item * addr)
2335 {
2336 uschar * p = sx->buffer;
2337 *p = 0;
2338
2339 /* Add any DSN flags to the rcpt command */
2340
2341 if (sx->peer_offered & PEER_OFFERED_DSN && !(addr->dsn_flags & rf_dsnlasthop))
2342 {
2343 if (addr->dsn_flags & rf_dsnflags)
2344 {
2345 int i;
2346 BOOL first = TRUE;
2347
2348 Ustrcpy(p, " NOTIFY=");
2349 while (*p) p++;
2350 for (i = 0; i < nelem(rf_list); i++) if (addr->dsn_flags & rf_list[i])
2351 {
2352 if (!first) *p++ = ',';
2353 first = FALSE;
2354 Ustrcpy(p, rf_names[i]);
2355 while (*p) p++;
2356 }
2357 }
2358
2359 if (addr->dsn_orcpt)
2360 {
2361 string_format(p, sizeof(sx->buffer) - (p-sx->buffer), " ORCPT=%s",
2362 addr->dsn_orcpt);
2363 while (*p) p++;
2364 }
2365 }
2366 }
2367
2368
2369
2370 /*
2371 Return:
2372 0 good, rcpt results in addr->transport_return (PENDING_OK, DEFER, FAIL)
2373 -1 MAIL response error
2374 -2 any non-MAIL read i/o error
2375 -3 non-MAIL response timeout
2376 -4 internal error; channel still usable
2377 -5 transmit failed
2378 */
2379
2380 int
2381 smtp_write_mail_and_rcpt_cmds(smtp_context * sx, int * yield)
2382 {
2383 address_item * addr;
2384 int address_count;
2385 int rc;
2386
2387 if (build_mailcmd_options(sx, sx->first_addr) != OK)
2388 {
2389 *yield = ERROR;
2390 return -4;
2391 }
2392
2393 /* From here until we send the DATA command, we can make use of PIPELINING
2394 if the server host supports it. The code has to be able to check the responses
2395 at any point, for when the buffer fills up, so we write it totally generally.
2396 When PIPELINING is off, each command written reports that it has flushed the
2397 buffer. */
2398
2399 sx->pending_MAIL = TRUE; /* The block starts with MAIL */
2400
2401 {
2402 uschar * s = sx->from_addr;
2403 #ifdef SUPPORT_I18N
2404 uschar * errstr = NULL;
2405
2406 /* If we must downconvert, do the from-address here. Remember we had to
2407 for the to-addresses (done below), and also (ugly) for re-doing when building
2408 the delivery log line. */
2409
2410 if ( sx->addrlist->prop.utf8_msg
2411 && (sx->addrlist->prop.utf8_downcvt || !(sx->peer_offered & PEER_OFFERED_UTF8))
2412 )
2413 {
2414 if (s = string_address_utf8_to_alabel(s, &errstr), errstr)
2415 {
2416 set_errno_nohost(sx->addrlist, ERRNO_EXPANDFAIL, errstr, DEFER, FALSE);
2417 *yield = ERROR;
2418 return -4;
2419 }
2420 setflag(sx->addrlist, af_utf8_downcvt);
2421 }
2422 #endif
2423
2424 rc = smtp_write_command(&sx->outblock, pipelining_active ? SCMD_BUFFER : SCMD_FLUSH,
2425 "MAIL FROM:<%s>%s\r\n", s, sx->buffer);
2426 }
2427
2428 mail_command = string_copy(big_buffer); /* Save for later error message */
2429
2430 switch(rc)
2431 {
2432 case -1: /* Transmission error */
2433 return -5;
2434
2435 case +1: /* Cmd was sent */
2436 if (!smtp_read_response(&sx->inblock, sx->buffer, sizeof(sx->buffer), '2',
2437 sx->ob->command_timeout))
2438 {
2439 if (errno == 0 && sx->buffer[0] == '4')
2440 {
2441 errno = ERRNO_MAIL4XX;
2442 sx->addrlist->more_errno |= ((sx->buffer[1] - '0')*10 + sx->buffer[2] - '0') << 8;
2443 }
2444 return -1;
2445 }
2446 sx->pending_MAIL = FALSE;
2447 break;
2448
2449 /* otherwise zero: command queued for pipeline */
2450 }
2451
2452 /* Pass over all the relevant recipient addresses for this host, which are the
2453 ones that have status PENDING_DEFER. If we are using PIPELINING, we can send
2454 several before we have to read the responses for those seen so far. This
2455 checking is done by a subroutine because it also needs to be done at the end.
2456 Send only up to max_rcpt addresses at a time, leaving next_addr pointing to
2457 the next one if not all are sent.
2458
2459 In the MUA wrapper situation, we want to flush the PIPELINING buffer for the
2460 last address because we want to abort if any recipients have any kind of
2461 problem, temporary or permanent. We know that all recipient addresses will have
2462 the PENDING_DEFER status, because only one attempt is ever made, and we know
2463 that max_rcpt will be large, so all addresses will be done at once.
2464
2465 For verify we flush the pipeline after any (the only) rcpt address. */
2466
2467 for (addr = sx->first_addr, address_count = 0;
2468 addr && address_count < sx->max_rcpt;
2469 addr = addr->next) if (addr->transport_return == PENDING_DEFER)
2470 {
2471 int count;
2472 BOOL no_flush;
2473 uschar * rcpt_addr;
2474
2475 addr->dsn_aware = sx->peer_offered & PEER_OFFERED_DSN
2476 ? dsn_support_yes : dsn_support_no;
2477
2478 address_count++;
2479 no_flush = pipelining_active && !sx->verify
2480 && (!mua_wrapper || addr->next && address_count < sx->max_rcpt);
2481
2482 build_rcptcmd_options(sx, addr);
2483
2484 /* Now send the RCPT command, and process outstanding responses when
2485 necessary. After a timeout on RCPT, we just end the function, leaving the
2486 yield as OK, because this error can often mean that there is a problem with
2487 just one address, so we don't want to delay the host. */
2488
2489 rcpt_addr = transport_rcpt_address(addr, sx->tblock->rcpt_include_affixes);
2490
2491 #ifdef SUPPORT_I18N
2492 if ( testflag(sx->addrlist, af_utf8_downcvt)
2493 && !(rcpt_addr = string_address_utf8_to_alabel(rcpt_addr, NULL))
2494 )
2495 {
2496 /*XXX could we use a per-address errstr here? Not fail the whole send? */
2497 errno = ERRNO_EXPANDFAIL;
2498 return -5; /*XXX too harsh? */
2499 }
2500 #endif
2501
2502 count = smtp_write_command(&sx->outblock, no_flush ? SCMD_BUFFER : SCMD_FLUSH,
2503 "RCPT TO:<%s>%s%s\r\n", rcpt_addr, sx->igquotstr, sx->buffer);
2504
2505 if (count < 0) return -5;
2506 if (count > 0)
2507 {
2508 switch(sync_responses(sx, count, 0))
2509 {
2510 case 3: sx->ok = TRUE; /* 2xx & 5xx => OK & progress made */
2511 case 2: sx->completed_addr = TRUE; /* 5xx (only) => progress made */
2512 break;
2513
2514 case 1: sx->ok = TRUE; /* 2xx (only) => OK, but if LMTP, */
2515 if (!sx->lmtp) /* can't tell about progress yet */
2516 sx->completed_addr = TRUE;
2517 case 0: /* No 2xx or 5xx, but no probs */
2518 break;
2519
2520 case -1: return -3; /* Timeout on RCPT */
2521 case -2: return -2; /* non-MAIL read i/o error */
2522 default: return -1; /* any MAIL error */
2523 }
2524 sx->pending_MAIL = FALSE; /* Dealt with MAIL */
2525 }
2526 } /* Loop for next address */
2527
2528 sx->next_addr = addr;
2529 return 0;
2530 }
2531
2532
2533 #ifdef SUPPORT_TLS
2534 /*****************************************************
2535 * Proxy TLS connection for another transport process *
2536 ******************************************************/
2537 /*
2538 Use the given buffer as a staging area, and select on both the given fd
2539 and the TLS'd client-fd for data to read (per the coding in ip_recv() and
2540 fd_ready() this is legitimate). Do blocking full-size writes, and reads
2541 under a timeout.
2542
2543 Arguments:
2544 buf space to use for buffering
2545 bufsiz size of buffer
2546 proxy_fd comms to proxied process
2547 timeout per-read timeout, seconds
2548 */
2549
2550 void
2551 smtp_proxy_tls(uschar * buf, size_t bsize, int proxy_fd, int timeout)
2552 {
2553 fd_set fds;
2554 int max_fd = MAX(proxy_fd, tls_out.active) + 1;
2555 int rc, i, fd_bits, nbytes;
2556
2557 set_process_info("proxying TLS connection for continued transport");
2558 FD_ZERO(&fds);
2559 FD_SET(tls_out.active, &fds);
2560 FD_SET(proxy_fd, &fds);
2561
2562 for (fd_bits = 3; fd_bits; )
2563 {
2564 time_t time_left = timeout;
2565 time_t time_start = time(NULL);
2566
2567 /* wait for data */
2568 do
2569 {
2570 struct timeval tv = { time_left, 0 };
2571
2572 rc = select(max_fd, (SELECT_ARG2_TYPE *)&fds, NULL, NULL, &tv);
2573
2574 if (rc < 0 && errno == EINTR)
2575 if ((time_left -= time(NULL) - time_start) > 0) continue;
2576
2577 if (rc <= 0)
2578 {
2579 DEBUG(D_transport) if (rc == 0) debug_printf("%s: timed out\n", __FUNCTION__);
2580 return;
2581 }
2582 }
2583 while (rc < 0 || !(FD_ISSET(tls_out.active, &fds) || FD_ISSET(proxy_fd, &fds)));
2584
2585 /* handle inbound data */
2586 if (FD_ISSET(tls_out.active, &fds))
2587 if ((rc = tls_read(FALSE, buf, bsize)) <= 0)
2588 {
2589 fd_bits &= ~1;
2590 FD_CLR(tls_out.active, &fds);
2591 shutdown(proxy_fd, SHUT_WR);
2592 }
2593 else
2594 {
2595 for (nbytes = 0; rc - nbytes > 0; nbytes += i)
2596 if ((i = write(proxy_fd, buf + nbytes, rc - nbytes)) < 0) return;
2597 }
2598 else if (fd_bits & 1)
2599 FD_SET(tls_out.active, &fds);
2600
2601 /* handle outbound data */
2602 if (FD_ISSET(proxy_fd, &fds))
2603 if ((rc = read(proxy_fd, buf, bsize)) <= 0)
2604 {
2605 fd_bits &= ~2;
2606 FD_CLR(proxy_fd, &fds);
2607 shutdown(tls_out.active, SHUT_WR);
2608 }
2609 else
2610 {
2611 for (nbytes = 0; rc - nbytes > 0; nbytes += i)
2612 if ((i = tls_write(FALSE, buf + nbytes, rc - nbytes)) < 0) return;
2613 }
2614 else if (fd_bits & 2)
2615 FD_SET(proxy_fd, &fds);
2616 }
2617 }
2618 #endif
2619
2620
2621 /*************************************************
2622 * Deliver address list to given host *
2623 *************************************************/
2624
2625 /* If continue_hostname is not null, we get here only when continuing to
2626 deliver down an existing channel. The channel was passed as the standard
2627 input. TLS is never active on a passed channel; the previous process always
2628 closes it down before passing the connection on.
2629
2630 Otherwise, we have to make a connection to the remote host, and do the
2631 initial protocol exchange.
2632
2633 When running as an MUA wrapper, if the sender or any recipient is rejected,
2634 temporarily or permanently, we force failure for all recipients.
2635
2636 Arguments:
2637 addrlist chain of potential addresses to deliver; only those whose
2638 transport_return field is set to PENDING_DEFER are currently
2639 being processed; others should be skipped - they have either
2640 been delivered to an earlier host or IP address, or been
2641 failed by one of them.
2642 host host to deliver to
2643 host_af AF_INET or AF_INET6
2644 port default TCP/IP port to use, in host byte order
2645 interface interface to bind to, or NULL
2646 tblock transport instance block
2647 message_defer set TRUE if yield is OK, but all addresses were deferred
2648 because of a non-recipient, non-host failure, that is, a
2649 4xx response to MAIL FROM, DATA, or ".". This is a defer
2650 that is specific to the message.
2651 suppress_tls if TRUE, don't attempt a TLS connection - this is set for
2652 a second attempt after TLS initialization fails
2653
2654 Returns: OK - the connection was made and the delivery attempted;
2655 the result for each address is in its data block.
2656 DEFER - the connection could not be made, or something failed
2657 while setting up the SMTP session, or there was a
2658 non-message-specific error, such as a timeout.
2659 ERROR - a filter command is specified for this transport,
2660 and there was a problem setting it up; OR helo_data
2661 or add_headers or authenticated_sender is specified
2662 for this transport, and the string failed to expand
2663 */
2664
2665 static int
2666 smtp_deliver(address_item *addrlist, host_item *host, int host_af, int port,
2667 uschar *interface, transport_instance *tblock,
2668 BOOL *message_defer, BOOL suppress_tls)
2669 {
2670 address_item *addr;
2671 int yield = OK;
2672 int save_errno;
2673 int rc;
2674 time_t start_delivery_time = time(NULL);
2675
2676 BOOL pass_message = FALSE;
2677 uschar *message = NULL;
2678 uschar new_message_id[MESSAGE_ID_LENGTH + 1];
2679 uschar *p;
2680
2681 smtp_context sx;
2682
2683 suppress_tls = suppress_tls; /* stop compiler warning when no TLS support */
2684 *message_defer = FALSE;
2685
2686 sx.addrlist = addrlist;
2687 sx.host = host;
2688 sx.host_af = host_af,
2689 sx.port = port;
2690 sx.interface = interface;
2691 sx.helo_data = NULL;
2692 sx.tblock = tblock;
2693 sx.verify = FALSE;
2694
2695 /* Get the channel set up ready for a message (MAIL FROM being the next
2696 SMTP command to send */
2697
2698 if ((rc = smtp_setup_conn(&sx, suppress_tls)) != OK)
2699 return rc;
2700
2701 /* If there is a filter command specified for this transport, we can now
2702 set it up. This cannot be done until the identify of the host is known. */
2703
2704 if (tblock->filter_command)
2705 {
2706 transport_filter_timeout = tblock->filter_timeout;
2707
2708 /* On failure, copy the error to all addresses, abandon the SMTP call, and
2709 yield ERROR. */
2710
2711 if (!transport_set_up_command(&transport_filter_argv,
2712 tblock->filter_command, TRUE, DEFER, addrlist,
2713 string_sprintf("%.50s transport", tblock->name), NULL))
2714 {
2715 set_errno_nohost(addrlist->next, addrlist->basic_errno, addrlist->message, DEFER,
2716 FALSE);
2717 yield = ERROR;
2718 goto SEND_QUIT;
2719 }
2720
2721 if ( transport_filter_argv
2722 && *transport_filter_argv
2723 && **transport_filter_argv
2724 && sx.peer_offered & PEER_OFFERED_CHUNKING
2725 )
2726 {
2727 sx.peer_offered &= ~PEER_OFFERED_CHUNKING;
2728 DEBUG(D_transport) debug_printf("CHUNKING not usable due to transport filter\n");
2729 }
2730 }
2731
2732 sx.first_addr = addrlist;
2733
2734 /* For messages that have more than the maximum number of envelope recipients,
2735 we want to send several transactions down the same SMTP connection. (See
2736 comments in deliver.c as to how this reconciles, heuristically, with
2737 remote_max_parallel.) This optimization was added to Exim after the following
2738 code was already working. The simplest way to put it in without disturbing the
2739 code was to use a goto to jump back to this point when there is another
2740 transaction to handle. */
2741
2742 SEND_MESSAGE:
2743 sx.from_addr = return_path;
2744 sx.sync_addr = sx.first_addr;
2745 sx.ok = FALSE;
2746 sx.send_rset = TRUE;
2747 sx.completed_addr = FALSE;
2748
2749
2750 /* If we are a continued-connection-after-verify the MAIL and RCPT
2751 commands were already sent; do not re-send but do mark the addrs as
2752 having been accepted up to RCPT stage. A traditional cont-conn
2753 always has a sequence number greater than one. */
2754
2755 if (continue_hostname && continue_sequence == 1)
2756 {
2757 address_item * addr;
2758
2759 sx.peer_offered = smtp_peer_options;
2760 sx.pending_MAIL = FALSE;
2761 sx.ok = TRUE;
2762 sx.next_addr = NULL;
2763
2764 for (addr = addrlist; addr; addr = addr->next)
2765 addr->transport_return = PENDING_OK;
2766 }
2767 else
2768 {
2769 /* Initiate a message transfer. */
2770
2771 switch(smtp_write_mail_and_rcpt_cmds(&sx, &yield))
2772 {
2773 case 0: break;
2774 case -1: case -2: goto RESPONSE_FAILED;
2775 case -3: goto END_OFF;
2776 case -4: goto SEND_QUIT;
2777 default: goto SEND_FAILED;
2778 }
2779
2780 /* If we are an MUA wrapper, abort if any RCPTs were rejected, either
2781 permanently or temporarily. We should have flushed and synced after the last
2782 RCPT. */
2783
2784 if (mua_wrapper)
2785 {
2786 address_item * a;
2787 unsigned cnt;
2788
2789 for (a = sx.first_addr, cnt = 0; a && cnt < sx.max_rcpt; a = a->next, cnt++)
2790 if (a->transport_return != PENDING_OK)
2791 {
2792 /*XXX could we find a better errno than 0 here? */
2793 set_errno_nohost(addrlist, 0, a->message, FAIL,
2794 testflag(a, af_pass_message));
2795 sx.ok = FALSE;
2796 break;
2797 }
2798 }
2799 }
2800
2801 /* If ok is TRUE, we know we have got at least one good recipient, and must now
2802 send DATA, but if it is FALSE (in the normal, non-wrapper case), we may still
2803 have a good recipient buffered up if we are pipelining. We don't want to waste
2804 time sending DATA needlessly, so we only send it if either ok is TRUE or if we
2805 are pipelining. The responses are all handled by sync_responses().
2806 If using CHUNKING, do not send a BDAT until we know how big a chunk we want
2807 to send is. */
2808
2809 if ( !(sx.peer_offered & PEER_OFFERED_CHUNKING)
2810 && (sx.ok || (pipelining_active && !mua_wrapper)))
2811 {
2812 int count = smtp_write_command(&sx.outblock, SCMD_FLUSH, "DATA\r\n");
2813
2814 if (count < 0) goto SEND_FAILED;
2815 switch(sync_responses(&sx, count, sx.ok ? +1 : -1))
2816 {
2817 case 3: sx.ok = TRUE; /* 2xx & 5xx => OK & progress made */
2818 case 2: sx.completed_addr = TRUE; /* 5xx (only) => progress made */
2819 break;
2820
2821 case 1: sx.ok = TRUE; /* 2xx (only) => OK, but if LMTP, */
2822 if (!sx.lmtp) sx.completed_addr = TRUE; /* can't tell about progress yet */
2823 case 0: break; /* No 2xx or 5xx, but no probs */
2824
2825 case -1: goto END_OFF; /* Timeout on RCPT */
2826 default: goto RESPONSE_FAILED; /* I/O error, or any MAIL/DATA error */
2827 }
2828 pipelining_active = FALSE;
2829 data_command = string_copy(big_buffer); /* Save for later error message */
2830 }
2831
2832 /* If there were no good recipients (but otherwise there have been no
2833 problems), just set ok TRUE, since we have handled address-specific errors
2834 already. Otherwise, it's OK to send the message. Use the check/escape mechanism
2835 for handling the SMTP dot-handling protocol, flagging to apply to headers as
2836 well as body. Set the appropriate timeout value to be used for each chunk.
2837 (Haven't been able to make it work using select() for writing yet.) */
2838
2839 if (!(sx.peer_offered & PEER_OFFERED_CHUNKING) && !sx.ok)
2840 {
2841 /* Save the first address of the next batch. */
2842 sx.first_addr = sx.next_addr;
2843
2844 sx.ok = TRUE;
2845 }
2846 else
2847 {
2848 transport_ctx tctx = {
2849 sx.inblock.sock,
2850 tblock,
2851 addrlist,
2852 US".", US"..", /* Escaping strings */
2853 topt_use_crlf | topt_escape_headers
2854 | (tblock->body_only ? topt_no_headers : 0)
2855 | (tblock->headers_only ? topt_no_body : 0)
2856 | (tblock->return_path_add ? topt_add_return_path : 0)
2857 | (tblock->delivery_date_add ? topt_add_delivery_date : 0)
2858 | (tblock->envelope_to_add ? topt_add_envelope_to : 0)
2859 };
2860
2861 /* If using CHUNKING we need a callback from the generic transport
2862 support to us, for the sending of BDAT smtp commands and the reaping
2863 of responses. The callback needs a whole bunch of state so set up
2864 a transport-context structure to be passed around. */
2865
2866 if (sx.peer_offered & PEER_OFFERED_CHUNKING)
2867 {
2868 tctx.check_string = tctx.escape_string = NULL;
2869 tctx.options |= topt_use_bdat;
2870 tctx.chunk_cb = smtp_chunk_cmd_callback;
2871 sx.pending_BDAT = FALSE;
2872 sx.good_RCPT = sx.ok;
2873 sx.cmd_count = 0;
2874 tctx.smtp_context = &sx;
2875 }
2876 else
2877 tctx.options |= topt_end_dot;
2878
2879 /* Save the first address of the next batch. */
2880 sx.first_addr = sx.next_addr;
2881
2882 /* Responses from CHUNKING commands go in buffer. Otherwise,
2883 there has not been a response. */
2884
2885 sx.buffer[0] = 0;
2886
2887 sigalrm_seen = FALSE;
2888 transport_write_timeout = sx.ob->data_timeout;
2889 smtp_command = US"sending data block"; /* For error messages */
2890 DEBUG(D_transport|D_v)
2891 if (sx.peer_offered & PEER_OFFERED_CHUNKING)
2892 debug_printf(" will write message using CHUNKING\n");
2893 else
2894 debug_printf(" SMTP>> writing message and terminating \".\"\n");
2895 transport_count = 0;
2896
2897 #ifndef DISABLE_DKIM
2898 sx.ok = dkim_transport_write_message(&tctx, &sx.ob->dkim, CUSS &message);
2899 #else
2900 sx.ok = transport_write_message(&tctx, 0);
2901 #endif
2902
2903 /* transport_write_message() uses write() because it is called from other
2904 places to write to non-sockets. This means that under some OS (e.g. Solaris)
2905 it can exit with "Broken pipe" as its error. This really means that the
2906 socket got closed at the far end. */
2907
2908 transport_write_timeout = 0; /* for subsequent transports */
2909
2910 /* Failure can either be some kind of I/O disaster (including timeout),
2911 or the failure of a transport filter or the expansion of added headers.
2912 Or, when CHUNKING, it can be a protocol-detected failure. */
2913
2914 if (!sx.ok)
2915 if (message) goto SEND_FAILED;
2916 else goto RESPONSE_FAILED;
2917
2918 /* We used to send the terminating "." explicitly here, but because of
2919 buffering effects at both ends of TCP/IP connections, you don't gain
2920 anything by keeping it separate, so it might as well go in the final
2921 data buffer for efficiency. This is now done by setting the topt_end_dot
2922 flag above. */
2923
2924 smtp_command = US"end of data";
2925
2926 if (sx.peer_offered & PEER_OFFERED_CHUNKING && sx.cmd_count > 1)
2927 {
2928 /* Reap any outstanding MAIL & RCPT commands, but not a DATA-go-ahead */
2929 switch(sync_responses(&sx, sx.cmd_count-1, 0))
2930 {
2931 case 3: sx.ok = TRUE; /* 2xx & 5xx => OK & progress made */
2932 case 2: sx.completed_addr = TRUE; /* 5xx (only) => progress made */
2933 break;
2934
2935 case 1: sx.ok = TRUE; /* 2xx (only) => OK, but if LMTP, */
2936 if (!sx.lmtp) sx.completed_addr = TRUE; /* can't tell about progress yet */
2937 case 0: break; /* No 2xx or 5xx, but no probs */
2938
2939 case -1: goto END_OFF; /* Timeout on RCPT */
2940 default: goto RESPONSE_FAILED; /* I/O error, or any MAIL/DATA error */
2941 }
2942 }
2943
2944 #ifndef DISABLE_PRDR
2945 /* For PRDR we optionally get a partial-responses warning
2946 * followed by the individual responses, before going on with
2947 * the overall response. If we don't get the warning then deal
2948 * with per non-PRDR. */
2949 if(sx.prdr_active)
2950 {
2951 sx.ok = smtp_read_response(&sx.inblock, sx.buffer, sizeof(sx.buffer), '3',
2952 sx.ob->final_timeout);
2953 if (!sx.ok && errno == 0) switch(sx.buffer[0])
2954 {
2955 case '2': sx.prdr_active = FALSE;
2956 sx.ok = TRUE;
2957 break;
2958 case '4': errno = ERRNO_DATA4XX;
2959 addrlist->more_errno |=
2960 ((sx.buffer[1] - '0')*10 + sx.buffer[2] - '0') << 8;
2961 break;
2962 }
2963 }
2964 else
2965 #endif
2966
2967 /* For non-PRDR SMTP, we now read a single response that applies to the
2968 whole message. If it is OK, then all the addresses have been delivered. */
2969
2970 if (!sx.lmtp)
2971 {
2972 sx.ok = smtp_read_response(&sx.inblock, sx.buffer, sizeof(sx.buffer), '2',
2973 sx.ob->final_timeout);
2974 if (!sx.ok && errno == 0 && sx.buffer[0] == '4')
2975 {
2976 errno = ERRNO_DATA4XX;
2977 addrlist->more_errno |= ((sx.buffer[1] - '0')*10 + sx.buffer[2] - '0') << 8;
2978 }
2979 }
2980
2981 /* For LMTP, we get back a response for every RCPT command that we sent;
2982 some may be accepted and some rejected. For those that get a response, their
2983 status is fixed; any that are accepted have been handed over, even if later
2984 responses crash - at least, that's how I read RFC 2033.
2985
2986 If all went well, mark the recipient addresses as completed, record which
2987 host/IPaddress they were delivered to, and cut out RSET when sending another
2988 message down the same channel. Write the completed addresses to the journal
2989 now so that they are recorded in case there is a crash of hardware or
2990 software before the spool gets updated. Also record the final SMTP
2991 confirmation if needed (for SMTP only). */
2992
2993 if (sx.ok)
2994 {
2995 int flag = '=';
2996 int delivery_time = (int)(time(NULL) - start_delivery_time);
2997 int len;
2998 uschar *conf = NULL;
2999
3000 sx.send_rset = FALSE;
3001 pipelining_active = FALSE;
3002
3003 /* Set up confirmation if needed - applies only to SMTP */
3004
3005 if (
3006 #ifdef DISABLE_EVENT
3007 LOGGING(smtp_confirmation) &&
3008 #endif
3009 !sx.lmtp
3010 )
3011 {
3012 const uschar *s = string_printing(sx.buffer);
3013 /* deconst cast ok here as string_printing was checked to have alloc'n'copied */
3014 conf = (s == sx.buffer)? (uschar *)string_copy(s) : US s;
3015 }
3016
3017 /* Process all transported addresses - for LMTP or PRDR, read a status for
3018 each one. */
3019
3020 for (addr = addrlist; addr != sx.first_addr; addr = addr->next)
3021 {
3022 if (addr->transport_return != PENDING_OK) continue;
3023
3024 /* LMTP - if the response fails badly (e.g. timeout), use it for all the
3025 remaining addresses. Otherwise, it's a return code for just the one
3026 address. For temporary errors, add a retry item for the address so that
3027 it doesn't get tried again too soon. */
3028
3029 #ifndef DISABLE_PRDR
3030 if (sx.lmtp || sx.prdr_active)
3031 #else
3032 if (sx.lmtp)
3033 #endif
3034 {
3035 if (!smtp_read_response(&sx.inblock, sx.buffer, sizeof(sx.buffer), '2',
3036 sx.ob->final_timeout))
3037 {
3038 if (errno != 0 || sx.buffer[0] == 0) goto RESPONSE_FAILED;
3039 addr->message = string_sprintf(
3040 #ifndef DISABLE_PRDR
3041 "%s error after %s: %s", sx.prdr_active ? "PRDR":"LMTP",
3042 #else
3043 "LMTP error after %s: %s",
3044 #endif
3045 data_command, string_printing(sx.buffer));
3046 setflag(addr, af_pass_message); /* Allow message to go to user */
3047 if (sx.buffer[0] == '5')
3048 addr->transport_return = FAIL;
3049 else
3050 {
3051 errno = ERRNO_DATA4XX;
3052 addr->more_errno |= ((sx.buffer[1] - '0')*10 + sx.buffer[2] - '0') << 8;
3053 addr->transport_return = DEFER;
3054 #ifndef DISABLE_PRDR
3055 if (!sx.prdr_active)
3056 #endif
3057 retry_add_item(addr, addr->address_retry_key, 0);
3058 }
3059 continue;
3060 }
3061 sx.completed_addr = TRUE; /* NOW we can set this flag */
3062 if (LOGGING(smtp_confirmation))
3063 {
3064 const uschar *s = string_printing(sx.buffer);
3065 /* deconst cast ok here as string_printing was checked to have alloc'n'copied */
3066 conf = (s == sx.buffer) ? US string_copy(s) : US s;
3067 }
3068 }
3069
3070 /* SMTP, or success return from LMTP for this address. Pass back the
3071 actual host that was used. */
3072
3073 addr->transport_return = OK;
3074 addr->more_errno = delivery_time;
3075 addr->host_used = host;
3076 addr->special_action = flag;
3077 addr->message = conf;
3078 #ifndef DISABLE_PRDR
3079 if (sx.prdr_active) addr->flags |= af_prdr_used;
3080 #endif
3081 if (sx.peer_offered & PEER_OFFERED_CHUNKING) addr->flags |= af_chunking_used;
3082 flag = '-';
3083
3084 #ifndef DISABLE_PRDR
3085 if (!sx.prdr_active)
3086 #endif
3087 {
3088 /* Update the journal. For homonymic addresses, use the base address plus
3089 the transport name. See lots of comments in deliver.c about the reasons
3090 for the complications when homonyms are involved. Just carry on after
3091 write error, as it may prove possible to update the spool file later. */
3092
3093 if (testflag(addr, af_homonym))
3094 sprintf(CS sx.buffer, "%.500s/%s\n", addr->unique + 3, tblock->name);
3095 else
3096 sprintf(CS sx.buffer, "%.500s\n", addr->unique);
3097
3098 DEBUG(D_deliver) debug_printf("S:journalling %s\n", sx.buffer);
3099 len = Ustrlen(CS sx.buffer);
3100 if (write(journal_fd, sx.buffer, len) != len)
3101 log_write(0, LOG_MAIN|LOG_PANIC, "failed to write journal for "
3102 "%s: %s", sx.buffer, strerror(errno));
3103 }
3104 }
3105
3106 #ifndef DISABLE_PRDR
3107 if (sx.prdr_active)
3108 {
3109 /* PRDR - get the final, overall response. For any non-success
3110 upgrade all the address statuses. */
3111 sx.ok = smtp_read_response(&sx.inblock, sx.buffer, sizeof(sx.buffer), '2',
3112 sx.ob->final_timeout);
3113 if (!sx.ok)
3114 {
3115 if(errno == 0 && sx.buffer[0] == '4')
3116 {
3117 errno = ERRNO_DATA4XX;
3118 addrlist->more_errno |= ((sx.buffer[1] - '0')*10 + sx.buffer[2] - '0') << 8;
3119 }
3120 for (addr = addrlist; addr != sx.first_addr; addr = addr->next)
3121 if (sx.buffer[0] == '5' || addr->transport_return == OK)
3122 addr->transport_return = PENDING_OK; /* allow set_errno action */
3123 goto RESPONSE_FAILED;
3124 }
3125
3126 /* Update the journal, or setup retry. */
3127 for (addr = addrlist; addr != sx.first_addr; addr = addr->next)
3128 if (addr->transport_return == OK)
3129 {
3130 if (testflag(addr, af_homonym))
3131 sprintf(CS sx.buffer, "%.500s/%s\n", addr->unique + 3, tblock->name);
3132 else
3133 sprintf(CS sx.buffer, "%.500s\n", addr->unique);
3134
3135 DEBUG(D_deliver) debug_printf("journalling(PRDR) %s\n", sx.buffer);
3136 len = Ustrlen(CS sx.buffer);
3137 if (write(journal_fd, sx.buffer, len) != len)
3138 log_write(0, LOG_MAIN|LOG_PANIC, "failed to write journal for "
3139 "%s: %s", sx.buffer, strerror(errno));
3140 }
3141 else if (addr->transport_return == DEFER)
3142 retry_add_item(addr, addr->address_retry_key, -2);
3143 }
3144 #endif
3145
3146 /* Ensure the journal file is pushed out to disk. */
3147
3148 if (EXIMfsync(journal_fd) < 0)
3149 log_write(0, LOG_MAIN|LOG_PANIC, "failed to fsync journal: %s",
3150 strerror(errno));
3151 }
3152 }
3153
3154
3155 /* Handle general (not specific to one address) failures here. The value of ok
3156 is used to skip over this code on the falling through case. A timeout causes a
3157 deferral. Other errors may defer or fail according to the response code, and
3158 may set up a special errno value, e.g. after connection chopped, which is
3159 assumed if errno == 0 and there is no text in the buffer. If control reaches
3160 here during the setting up phase (i.e. before MAIL FROM) then always defer, as
3161 the problem is not related to this specific message. */
3162
3163 if (!sx.ok)
3164 {
3165 int code, set_rc;
3166 uschar * set_message;
3167
3168 RESPONSE_FAILED:
3169 {
3170 save_errno = errno;
3171 message = NULL;
3172 sx.send_quit = check_response(host, &save_errno, addrlist->more_errno,
3173 sx.buffer, &code, &message, &pass_message);
3174 goto FAILED;
3175 }
3176
3177 SEND_FAILED:
3178 {
3179 save_errno = errno;
3180 code = '4';
3181 message = string_sprintf("send() to %s [%s] failed: %s",
3182 host->name, host->address, message ? message : US strerror(save_errno));
3183 sx.send_quit = FALSE;
3184 goto FAILED;
3185 }
3186
3187 FAILED:
3188 {
3189 BOOL message_error;
3190
3191 sx.ok = FALSE; /* For when reached by GOTO */
3192 set_message = message;
3193
3194 /* We want to handle timeouts after MAIL or "." and loss of connection after
3195 "." specially. They can indicate a problem with the sender address or with
3196 the contents of the message rather than a real error on the connection. These
3197 cases are treated in the same way as a 4xx response. This next bit of code
3198 does the classification. */
3199
3200 switch(save_errno)
3201 {
3202 case 0:
3203 case ERRNO_MAIL4XX:
3204 case ERRNO_DATA4XX:
3205 message_error = TRUE;
3206 break;
3207
3208 case ETIMEDOUT:
3209 message_error = Ustrncmp(smtp_command,"MAIL",4) == 0 ||
3210 Ustrncmp(smtp_command,"end ",4) == 0;
3211 break;
3212
3213 case ERRNO_SMTPCLOSED:
3214 message_error = Ustrncmp(smtp_command,"end ",4) == 0;
3215 break;
3216
3217 default:
3218 message_error = FALSE;
3219 break;
3220 }
3221
3222 /* Handle the cases that are treated as message errors. These are:
3223
3224 (a) negative response or timeout after MAIL
3225 (b) negative response after DATA
3226 (c) negative response or timeout or dropped connection after "."
3227 (d) utf8 support required and not offered
3228
3229 It won't be a negative response or timeout after RCPT, as that is dealt
3230 with separately above. The action in all cases is to set an appropriate
3231 error code for all the addresses, but to leave yield set to OK because the
3232 host itself has not failed. Of course, it might in practice have failed
3233 when we've had a timeout, but if so, we'll discover that at the next
3234 delivery attempt. For a temporary error, set the message_defer flag, and
3235 write to the logs for information if this is not the last host. The error
3236 for the last host will be logged as part of the address's log line. */
3237
3238 if (message_error)
3239 {
3240 if (mua_wrapper) code = '5'; /* Force hard failure in wrapper mode */
3241
3242 /* If there's an errno, the message contains just the identity of
3243 the host. */
3244
3245 if (code == '5')
3246 set_rc = FAIL;
3247 else /* Anything other than 5 is treated as temporary */
3248 {
3249 set_rc = DEFER;
3250 if (save_errno > 0)
3251 message = US string_sprintf("%s: %s", message, strerror(save_errno));
3252 if (host->next != NULL) log_write(0, LOG_MAIN, "%s", message);
3253 msglog_line(host, message);
3254 *message_defer = TRUE;
3255 }
3256 }
3257
3258 /* Otherwise, we have an I/O error or a timeout other than after MAIL or
3259 ".", or some other transportation error. We defer all addresses and yield
3260 DEFER, except for the case of failed add_headers expansion, or a transport
3261 filter failure, when the yield should be ERROR, to stop it trying other
3262 hosts. */
3263
3264 else
3265 {
3266 set_rc = DEFER;
3267 yield = (save_errno == ERRNO_CHHEADER_FAIL ||
3268 save_errno == ERRNO_FILTER_FAIL)? ERROR : DEFER;
3269 }
3270 }
3271
3272 set_errno(addrlist, save_errno, set_message, set_rc, pass_message, host
3273 #ifdef EXPERIMENTAL_DSN_INFO
3274 , sx.smtp_greeting, sx.helo_response
3275 #endif
3276 );
3277 }
3278
3279
3280 /* If all has gone well, send_quit will be set TRUE, implying we can end the
3281 SMTP session tidily. However, if there were too many addresses to send in one
3282 message (indicated by first_addr being non-NULL) we want to carry on with the
3283 rest of them. Also, it is desirable to send more than one message down the SMTP
3284 connection if there are several waiting, provided we haven't already sent so
3285 many as to hit the configured limit. The function transport_check_waiting looks
3286 for a waiting message and returns its id. Then transport_pass_socket tries to
3287 set up a continued delivery by passing the socket on to another process. The
3288 variable send_rset is FALSE if a message has just been successfully transfered.
3289
3290 If we are already sending down a continued channel, there may be further
3291 addresses not yet delivered that are aimed at the same host, but which have not
3292 been passed in this run of the transport. In this case, continue_more will be
3293 true, and all we should do is send RSET if necessary, and return, leaving the
3294 channel open.
3295
3296 However, if no address was disposed of, i.e. all addresses got 4xx errors, we
3297 do not want to continue with other messages down the same channel, because that
3298 can lead to looping between two or more messages, all with the same,
3299 temporarily failing address(es). [The retry information isn't updated yet, so
3300 new processes keep on trying.] We probably also don't want to try more of this
3301 message's addresses either.
3302
3303 If we have started a TLS session, we have to end it before passing the
3304 connection to a new process. However, not all servers can handle this (Exim
3305 can), so we do not pass such a connection on if the host matches
3306 hosts_nopass_tls. */
3307
3308 DEBUG(D_transport)
3309 debug_printf("ok=%d send_quit=%d send_rset=%d continue_more=%d "
3310 "yield=%d first_address is %sNULL\n", sx.ok, sx.send_quit,
3311 sx.send_rset, continue_more, yield, sx.first_addr ? "not " : "");
3312
3313 if (sx.completed_addr && sx.ok && sx.send_quit)
3314 {
3315 BOOL more;
3316 smtp_compare_t t_compare;
3317
3318 t_compare.tblock = tblock;
3319 t_compare.current_sender_address = sender_address;
3320
3321 if ( sx.first_addr != NULL
3322 || continue_more
3323 || (
3324 #ifdef SUPPORT_TLS
3325 ( tls_out.active < 0 && !continue_proxy_cipher
3326 || verify_check_given_host(&sx.ob->hosts_nopass_tls, host) != OK
3327 )
3328 &&
3329 #endif
3330 transport_check_waiting(tblock->name, host->name,
3331 tblock->connection_max_messages, new_message_id, &more,
3332 (oicf)smtp_are_same_identities, (void*)&t_compare)
3333 ) )
3334 {
3335 uschar *msg;
3336 BOOL pass_message;
3337
3338 if (sx.send_rset)
3339 if (! (sx.ok = smtp_write_command(&sx.outblock, SCMD_FLUSH, "RSET\r\n") >= 0))
3340 {
3341 msg = US string_sprintf("send() to %s [%s] failed: %s", host->name,
3342 host->address, strerror(errno));
3343 sx.send_quit = FALSE;
3344 }
3345 else if (! (sx.ok = smtp_read_response(&sx.inblock, sx.buffer,
3346 sizeof(sx.buffer), '2', sx.ob->command_timeout)))
3347 {
3348 int code;
3349 sx.send_quit = check_response(host, &errno, 0, sx.buffer, &code, &msg,
3350 &pass_message);
3351 if (!sx.send_quit)
3352 {
3353 DEBUG(D_transport) debug_printf("H=%s [%s] %s\n",
3354 host->name, host->address, msg);
3355 }
3356 }
3357
3358 /* Either RSET was not needed, or it succeeded */
3359
3360 if (sx.ok)
3361 {
3362 int pfd[2];
3363 int socket_fd = sx.inblock.sock;
3364
3365
3366 if (sx.first_addr != NULL) /* More addresses still to be sent */
3367 { /* in this run of the transport */
3368 continue_sequence++; /* Causes * in logging */
3369 goto SEND_MESSAGE;
3370 }
3371
3372 /* Unless caller said it already has more messages listed for this host,
3373 pass the connection on to a new Exim process (below, the call to
3374 transport_pass_socket). If the caller has more ready, just return with
3375 the connection still open. */
3376
3377 #ifdef SUPPORT_TLS
3378 if (tls_out.active >= 0)
3379 if ( continue_more
3380 || verify_check_given_host(&sx.ob->hosts_noproxy_tls, host) == OK)
3381 {
3382 /* Before passing the socket on, or returning to caller with it still
3383 open, we must shut down TLS. Not all MTAs allow for the continuation
3384 of the SMTP session when TLS is shut down. We test for this by sending
3385 a new EHLO. If we don't get a good response, we don't attempt to pass
3386 the socket on. */
3387
3388 tls_close(FALSE, TRUE);
3389 smtp_peer_options = smtp_peer_options_wrap;
3390 sx.ok = !sx.smtps
3391 && smtp_write_command(&sx.outblock, SCMD_FLUSH,
3392 "EHLO %s\r\n", sx.helo_data) >= 0
3393 && smtp_read_response(&sx.inblock, sx.buffer, sizeof(sx.buffer),
3394 '2', sx.ob->command_timeout);
3395
3396 if (sx.ok && continue_more)
3397 return yield; /* More addresses for another run */
3398 }
3399 else
3400 {
3401 /* Set up a pipe for proxying TLS for the new transport process */
3402
3403 smtp_peer_options |= PEER_OFFERED_TLS;
3404 if (sx.ok = (socketpair(AF_UNIX, SOCK_STREAM, 0, pfd) == 0))
3405 socket_fd = pfd[1];
3406 else
3407 set_errno(sx.first_addr, errno, US"internal allocation problem",
3408 DEFER, FALSE, host
3409 # ifdef EXPERIMENTAL_DSN_INFO
3410 , sx.smtp_greeting, sx.helo_response
3411 # endif
3412 );
3413 }
3414 else
3415 #endif
3416 if (continue_more)
3417 return yield; /* More addresses for another run */
3418
3419 /* If the socket is successfully passed, we mustn't send QUIT (or
3420 indeed anything!) from here. */
3421
3422 /*XXX DSN_INFO: assume likely to do new HELO; but for greet we'll want to
3423 propagate it from the initial
3424 */
3425 if (sx.ok && transport_pass_socket(tblock->name, host->name,
3426 host->address, new_message_id, socket_fd))
3427 {
3428 sx.send_quit = FALSE;
3429
3430 /* If TLS is still active, we need to proxy it for the transport we
3431 just passed the baton to. Fork a child to to do it, and return to
3432 get logging done asap. Which way to place the work makes assumptions
3433 about post-fork prioritisation which may not hold on all platforms. */
3434 #ifdef SUPPORT_TLS
3435 if (tls_out.active >= 0)
3436 {
3437 int pid = fork();
3438 if (pid > 0) /* parent */
3439 {
3440 DEBUG(D_transport) debug_printf("proxy-proc inter-pid %d\n", pid);
3441 waitpid(pid, NULL, 0);
3442 tls_close(FALSE, FALSE);
3443 (void)close(sx.inblock.sock);
3444 continue_transport = NULL;
3445 continue_hostname = NULL;
3446 return yield;
3447 }
3448 else if (pid == 0) /* child; fork again to disconnect totally */
3449 {
3450 if ((pid = fork()))
3451 {
3452 DEBUG(D_transport) debug_printf("proxy-prox final-pid %d\n", pid);
3453 _exit(pid ? EXIT_FAILURE : EXIT_SUCCESS);
3454 }
3455 smtp_proxy_tls(sx.buffer, sizeof(sx.buffer), pfd[0], sx.ob->command_timeout);
3456 exim_exit(0);
3457 }
3458 }
3459 #endif
3460 }
3461 }
3462
3463 /* If RSET failed and there are addresses left, they get deferred. */
3464 else
3465 set_errno(sx.first_addr, errno, msg, DEFER, FALSE, host
3466 #ifdef EXPERIMENTAL_DSN_INFO
3467 , sx.smtp_greeting, sx.helo_response
3468 #endif
3469 );
3470 }
3471 }
3472
3473 /* End off tidily with QUIT unless the connection has died or the socket has
3474 been passed to another process. There has been discussion on the net about what
3475 to do after sending QUIT. The wording of the RFC suggests that it is necessary
3476 to wait for a response, but on the other hand, there isn't anything one can do
3477 with an error response, other than log it. Exim used to do that. However,
3478 further discussion suggested that it is positively advantageous not to wait for
3479 the response, but to close the session immediately. This is supposed to move
3480 the TCP/IP TIME_WAIT state from the server to the client, thereby removing some
3481 load from the server. (Hosts that are both servers and clients may not see much
3482 difference, of course.) Further discussion indicated that this was safe to do
3483 on Unix systems which have decent implementations of TCP/IP that leave the
3484 connection around for a while (TIME_WAIT) after the application has gone away.
3485 This enables the response sent by the server to be properly ACKed rather than
3486 timed out, as can happen on broken TCP/IP implementations on other OS.
3487
3488 This change is being made on 31-Jul-98. After over a year of trouble-free
3489 operation, the old commented-out code was removed on 17-Sep-99. */
3490
3491 SEND_QUIT:
3492 if (sx.send_quit) (void)smtp_write_command(&sx.outblock, SCMD_FLUSH, "QUIT\r\n");
3493
3494 END_OFF:
3495
3496 #ifdef SUPPORT_TLS
3497 tls_close(FALSE, TRUE);
3498 #endif
3499
3500 /* Close the socket, and return the appropriate value, first setting
3501 works because the NULL setting is passed back to the calling process, and
3502 remote_max_parallel is forced to 1 when delivering over an existing connection,
3503
3504 If all went well and continue_more is set, we shouldn't actually get here if
3505 there are further addresses, as the return above will be taken. However,
3506 writing RSET might have failed, or there may be other addresses whose hosts are
3507 specified in the transports, and therefore not visible at top level, in which
3508 case continue_more won't get set. */
3509
3510 HDEBUG(D_transport|D_acl|D_v) debug_printf_indent(" SMTP(close)>>\n");
3511 if (sx.send_quit)
3512 {
3513 shutdown(sx.outblock.sock, SHUT_WR);
3514 if (fcntl(sx.inblock.sock, F_SETFL, O_NONBLOCK) == 0)
3515 for (rc = 16; read(sx.inblock.sock, sx.inbuffer, sizeof(sx.inbuffer)) > 0 && rc > 0;)
3516 rc--; /* drain socket */
3517 }
3518 (void)close(sx.inblock.sock);
3519
3520 #ifndef DISABLE_EVENT
3521 (void) event_raise(tblock->event_action, US"tcp:close", NULL);
3522 #endif
3523
3524 continue_transport = NULL;
3525 continue_hostname = NULL;
3526 return yield;
3527 }
3528
3529
3530
3531
3532 /*************************************************
3533 * Closedown entry point *
3534 *************************************************/
3535
3536 /* This function is called when exim is passed an open smtp channel
3537 from another incarnation, but the message which it has been asked
3538 to deliver no longer exists. The channel is on stdin.
3539
3540 We might do fancy things like looking for another message to send down
3541 the channel, but if the one we sought has gone, it has probably been
3542 delivered by some other process that itself will seek further messages,
3543 so just close down our connection.
3544
3545 Argument: pointer to the transport instance block
3546 Returns: nothing
3547 */
3548
3549 void
3550 smtp_transport_closedown(transport_instance *tblock)
3551 {
3552 smtp_transport_options_block *ob =
3553 (smtp_transport_options_block *)tblock->options_block;
3554 smtp_inblock inblock;
3555 smtp_outblock outblock;
3556 uschar buffer[256];
3557 uschar inbuffer[4096];
3558 uschar outbuffer[16];
3559
3560 inblock.sock = fileno(stdin);
3561 inblock.buffer = inbuffer;
3562 inblock.buffersize = sizeof(inbuffer);
3563 inblock.ptr = inbuffer;
3564 inblock.ptrend = inbuffer;
3565
3566 outblock.sock = inblock.sock;
3567 outblock.buffersize = sizeof(outbuffer);
3568 outblock.buffer = outbuffer;
3569 outblock.ptr = outbuffer;
3570 outblock.cmd_count = 0;
3571 outblock.authenticating = FALSE;
3572
3573 (void)smtp_write_command(&outblock, SCMD_FLUSH, "QUIT\r\n");
3574 (void)smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
3575 ob->command_timeout);
3576 (void)close(inblock.sock);
3577 }
3578
3579
3580
3581 /*************************************************
3582 * Prepare addresses for delivery *
3583 *************************************************/
3584
3585 /* This function is called to flush out error settings from previous delivery
3586 attempts to other hosts. It also records whether we got here via an MX record
3587 or not in the more_errno field of the address. We are interested only in
3588 addresses that are still marked DEFER - others may have got delivered to a
3589 previously considered IP address. Set their status to PENDING_DEFER to indicate
3590 which ones are relevant this time.
3591
3592 Arguments:
3593 addrlist the list of addresses
3594 host the host we are delivering to
3595
3596 Returns: the first address for this delivery
3597 */
3598
3599 static address_item *
3600 prepare_addresses(address_item *addrlist, host_item *host)
3601 {
3602 address_item *first_addr = NULL;
3603 address_item *addr;
3604 for (addr = addrlist; addr; addr = addr->next)
3605 if (addr->transport_return == DEFER)
3606 {
3607 if (!first_addr) first_addr = addr;
3608 addr->transport_return = PENDING_DEFER;
3609 addr->basic_errno = 0;
3610 addr->more_errno = (host->mx >= 0)? 'M' : 'A';
3611 addr->message = NULL;
3612 #ifdef SUPPORT_TLS
3613 addr->cipher = NULL;
3614 addr->ourcert = NULL;
3615 addr->peercert = NULL;
3616 addr->peerdn = NULL;
3617 addr->ocsp = OCSP_NOT_REQ;
3618 #endif
3619 #ifdef EXPERIMENTAL_DSN_INFO
3620 addr->smtp_greeting = NULL;
3621 addr->helo_response = NULL;
3622 #endif
3623 }
3624 return first_addr;
3625 }
3626
3627
3628
3629 /*************************************************
3630 * Main entry point *
3631 *************************************************/
3632
3633 /* See local README for interface details. As this is a remote transport, it is
3634 given a chain of addresses to be delivered in one connection, if possible. It
3635 always returns TRUE, indicating that each address has its own independent
3636 status set, except if there is a setting up problem, in which case it returns
3637 FALSE. */
3638
3639 BOOL
3640 smtp_transport_entry(
3641 transport_instance *tblock, /* data for this instantiation */
3642 address_item *addrlist) /* addresses we are working on */
3643 {
3644 int cutoff_retry;
3645 int port;
3646 int hosts_defer = 0;
3647 int hosts_fail = 0;
3648 int hosts_looked_up = 0;
3649 int hosts_retry = 0;
3650 int hosts_serial = 0;
3651 int hosts_total = 0;
3652 int total_hosts_tried = 0;
3653 address_item *addr;
3654 BOOL expired = TRUE;
3655 uschar *expanded_hosts = NULL;
3656 uschar *pistring;
3657 uschar *tid = string_sprintf("%s transport", tblock->name);
3658 smtp_transport_options_block *ob =
3659 (smtp_transport_options_block *)(tblock->options_block);
3660 host_item *hostlist = addrlist->host_list;
3661 host_item *host = NULL;
3662
3663 DEBUG(D_transport)
3664 {
3665 debug_printf("%s transport entered\n", tblock->name);
3666 for (addr = addrlist; addr; addr = addr->next)
3667 debug_printf(" %s\n", addr->address);
3668 if (hostlist)
3669 {
3670 debug_printf("hostlist:\n");
3671 for (host = hostlist; host; host = host->next)
3672 debug_printf(" %s:%d\n", host->name, host->port);
3673 }
3674 if (continue_hostname)
3675 debug_printf("already connected to %s [%s] (on fd %d)\n",
3676 continue_hostname, continue_host_address,
3677 cutthrough.fd >= 0 ? cutthrough.fd : 0);
3678 }
3679
3680 /* Set the flag requesting that these hosts be added to the waiting
3681 database if the delivery fails temporarily or if we are running with
3682 queue_smtp or a 2-stage queue run. This gets unset for certain
3683 kinds of error, typically those that are specific to the message. */
3684
3685 update_waiting = TRUE;
3686
3687 /* If a host list is not defined for the addresses - they must all have the
3688 same one in order to be passed to a single transport - or if the transport has
3689 a host list with hosts_override set, use the host list supplied with the
3690 transport. It is an error for this not to exist. */
3691
3692 if (!hostlist || (ob->hosts_override && ob->hosts))
3693 {
3694 if (!ob->hosts)
3695 {
3696 addrlist->message = string_sprintf("%s transport called with no hosts set",
3697 tblock->name);
3698 addrlist->transport_return = PANIC;
3699 return FALSE; /* Only top address has status */
3700 }
3701
3702 DEBUG(D_transport) debug_printf("using the transport's hosts: %s\n",
3703 ob->hosts);
3704
3705 /* If the transport's host list contains no '$' characters, and we are not
3706 randomizing, it is fixed and therefore a chain of hosts can be built once
3707 and for all, and remembered for subsequent use by other calls to this
3708 transport. If, on the other hand, the host list does contain '$', or we are
3709 randomizing its order, we have to rebuild it each time. In the fixed case,
3710 as the hosts string will never be used again, it doesn't matter that we
3711 replace all the : characters with zeros. */
3712
3713 if (!ob->hostlist)
3714 {
3715 uschar *s = ob->hosts;
3716
3717 if (Ustrchr(s, '$') != NULL)
3718 {
3719 if (!(expanded_hosts = expand_string(s)))
3720 {
3721 addrlist->message = string_sprintf("failed to expand list of hosts "
3722 "\"%s\" in %s transport: %s", s, tblock->name, expand_string_message);
3723 addrlist->transport_return = search_find_defer ? DEFER : PANIC;
3724 return FALSE; /* Only top address has status */
3725 }
3726 DEBUG(D_transport) debug_printf("expanded list of hosts \"%s\" to "
3727 "\"%s\"\n", s, expanded_hosts);
3728 s = expanded_hosts;
3729 }
3730 else
3731 if (ob->hosts_randomize) s = expanded_hosts = string_copy(s);
3732
3733 host_build_hostlist(&hostlist, s, ob->hosts_randomize);
3734
3735 /* Check that the expansion yielded something useful. */
3736 if (!hostlist)
3737 {
3738 addrlist->message =
3739 string_sprintf("%s transport has empty hosts setting", tblock->name);
3740 addrlist->transport_return = PANIC;
3741 return FALSE; /* Only top address has status */
3742 }
3743
3744 /* If there was no expansion of hosts, save the host list for
3745 next time. */
3746
3747 if (!expanded_hosts) ob->hostlist = hostlist;
3748 }
3749
3750 /* This is not the first time this transport has been run in this delivery;
3751 the host list was built previously. */
3752
3753 else
3754 hostlist = ob->hostlist;
3755 }
3756
3757 /* The host list was supplied with the address. If hosts_randomize is set, we
3758 must sort it into a random order if it did not come from MX records and has not
3759 already been randomized (but don't bother if continuing down an existing
3760 connection). */
3761
3762 else if (ob->hosts_randomize && hostlist->mx == MX_NONE && !continue_hostname)
3763 {
3764 host_item *newlist = NULL;
3765 while (hostlist)
3766 {
3767 host_item *h = hostlist;
3768 hostlist = hostlist->next;
3769
3770 h->sort_key = random_number(100);
3771
3772 if (!newlist)
3773 {
3774 h->next = NULL;
3775 newlist = h;
3776 }
3777 else if (h->sort_key < newlist->sort_key)
3778 {
3779 h->next = newlist;
3780 newlist = h;
3781 }
3782 else
3783 {
3784 host_item *hh = newlist;
3785 while (hh->next)
3786 {
3787 if (h->sort_key < hh->next->sort_key) break;
3788 hh = hh->next;
3789 }
3790 h->next = hh->next;
3791 hh->next = h;
3792 }
3793 }
3794
3795 hostlist = addrlist->host_list = newlist;
3796 }
3797
3798 /* Sort out the default port. */
3799
3800 if (!smtp_get_port(ob->port, addrlist, &port, tid)) return FALSE;
3801
3802 /* For each host-plus-IP-address on the list:
3803
3804 . If this is a continued delivery and the host isn't the one with the
3805 current connection, skip.
3806
3807 . If the status is unusable (i.e. previously failed or retry checked), skip.
3808
3809 . If no IP address set, get the address, either by turning the name into
3810 an address, calling gethostbyname if gethostbyname is on, or by calling
3811 the DNS. The DNS may yield multiple addresses, in which case insert the
3812 extra ones into the list.
3813
3814 . Get the retry data if not previously obtained for this address and set the
3815 field which remembers the state of this address. Skip if the retry time is
3816 not reached. If not, remember whether retry data was found. The retry string
3817 contains both the name and the IP address.
3818
3819 . Scan the list of addresses and mark those whose status is DEFER as
3820 PENDING_DEFER. These are the only ones that will be processed in this cycle
3821 of the hosts loop.
3822
3823 . Make a delivery attempt - addresses marked PENDING_DEFER will be tried.
3824 Some addresses may be successfully delivered, others may fail, and yet
3825 others may get temporary errors and so get marked DEFER.
3826
3827 . The return from the delivery attempt is OK if a connection was made and a
3828 valid SMTP dialogue was completed. Otherwise it is DEFER.
3829
3830 . If OK, add a "remove" retry item for this host/IPaddress, if any.
3831
3832 . If fail to connect, or other defer state, add a retry item.
3833
3834 . If there are any addresses whose status is still DEFER, carry on to the
3835 next host/IPaddress, unless we have tried the number of hosts given
3836 by hosts_max_try or hosts_max_try_hardlimit; otherwise return. Note that
3837 there is some fancy logic for hosts_max_try that means its limit can be
3838 overstepped in some circumstances.
3839
3840 If we get to the end of the list, all hosts have deferred at least one address,
3841 or not reached their retry times. If delay_after_cutoff is unset, it requests a
3842 delivery attempt to those hosts whose last try was before the arrival time of
3843 the current message. To cope with this, we have to go round the loop a second
3844 time. After that, set the status and error data for any addresses that haven't
3845 had it set already. */
3846
3847 for (cutoff_retry = 0;
3848 expired && cutoff_retry < (ob->delay_after_cutoff ? 1 : 2);
3849 cutoff_retry++)
3850 {
3851 host_item *nexthost = NULL;
3852 int unexpired_hosts_tried = 0;
3853
3854 for (host = hostlist;
3855 host
3856 && unexpired_hosts_tried < ob->hosts_max_try
3857 && total_hosts_tried < ob->hosts_max_try_hardlimit;
3858 host = nexthost)
3859 {
3860 int rc;
3861 int host_af;
3862 uschar *rs;
3863 BOOL host_is_expired = FALSE;
3864 BOOL message_defer = FALSE;
3865 BOOL some_deferred = FALSE;
3866 address_item *first_addr = NULL;
3867 uschar *interface = NULL;
3868 uschar *retry_host_key = NULL;
3869 uschar *retry_message_key = NULL;
3870 uschar *serialize_key = NULL;
3871
3872 /* Default next host is next host. :-) But this can vary if the
3873 hosts_max_try limit is hit (see below). It may also be reset if a host
3874 address is looked up here (in case the host was multihomed). */
3875
3876 nexthost = host->next;
3877
3878 /* If the address hasn't yet been obtained from the host name, look it up
3879 now, unless the host is already marked as unusable. If it is marked as
3880 unusable, it means that the router was unable to find its IP address (in
3881 the DNS or wherever) OR we are in the 2nd time round the cutoff loop, and
3882 the lookup failed last time. We don't get this far if *all* MX records
3883 point to non-existent hosts; that is treated as a hard error.
3884
3885 We can just skip this host entirely. When the hosts came from the router,
3886 the address will timeout based on the other host(s); when the address is
3887 looked up below, there is an explicit retry record added.
3888
3889 Note that we mustn't skip unusable hosts if the address is not unset; they
3890 may be needed as expired hosts on the 2nd time round the cutoff loop. */
3891
3892 if (!host->address)
3893 {
3894 int new_port, flags;
3895 host_item *hh;
3896
3897 if (host->status >= hstatus_unusable)
3898 {
3899 DEBUG(D_transport) debug_printf("%s has no address and is unusable - skipping\n",
3900 host->name);
3901 continue;
3902 }
3903
3904 DEBUG(D_transport) debug_printf("getting address for %s\n", host->name);
3905
3906 /* The host name is permitted to have an attached port. Find it, and
3907 strip it from the name. Just remember it for now. */
3908
3909 new_port = host_item_get_port(host);
3910
3911 /* Count hosts looked up */
3912
3913 hosts_looked_up++;
3914
3915 /* Find by name if so configured, or if it's an IP address. We don't
3916 just copy the IP address, because we need the test-for-local to happen. */
3917
3918 flags = HOST_FIND_BY_A;
3919 if (ob->dns_qualify_single) flags |= HOST_FIND_QUALIFY_SINGLE;
3920 if (ob->dns_search_parents) flags |= HOST_FIND_SEARCH_PARENTS;
3921
3922 if (ob->gethostbyname || string_is_ip_address(host->name, NULL) != 0)
3923 rc = host_find_byname(host, NULL, flags, NULL, TRUE);
3924 else
3925 rc = host_find_bydns(host, NULL, flags, NULL, NULL, NULL,
3926 &ob->dnssec, /* domains for request/require */
3927 NULL, NULL);
3928
3929 /* Update the host (and any additional blocks, resulting from
3930 multihoming) with a host-specific port, if any. */
3931
3932 for (hh = host; hh != nexthost; hh = hh->next) hh->port = new_port;
3933
3934 /* Failure to find the host at this time (usually DNS temporary failure)
3935 is really a kind of routing failure rather than a transport failure.
3936 Therefore we add a retry item of the routing kind, not to stop us trying
3937 to look this name up here again, but to ensure the address gets timed
3938 out if the failures go on long enough. A complete failure at this point
3939 commonly points to a configuration error, but the best action is still
3940 to carry on for the next host. */
3941
3942 if (rc == HOST_FIND_AGAIN || rc == HOST_FIND_SECURITY || rc == HOST_FIND_FAILED)
3943 {
3944 retry_add_item(addrlist, string_sprintf("R:%s", host->name), 0);
3945 expired = FALSE;
3946 if (rc == HOST_FIND_AGAIN) hosts_defer++; else hosts_fail++;
3947 DEBUG(D_transport) debug_printf("rc = %s for %s\n", (rc == HOST_FIND_AGAIN)?
3948 "HOST_FIND_AGAIN" : "HOST_FIND_FAILED", host->name);
3949 host->status = hstatus_unusable;
3950
3951 for (addr = addrlist; addr; addr = addr->next)
3952 {
3953 if (addr->transport_return != DEFER) continue;
3954 addr->basic_errno = ERRNO_UNKNOWNHOST;
3955 addr->message = string_sprintf(
3956 rc == HOST_FIND_SECURITY
3957 ? "lookup of IP address for %s was insecure"
3958 : "failed to lookup IP address for %s",
3959 host->name);
3960 }
3961 continue;
3962 }
3963
3964 /* If the host is actually the local host, we may have a problem, or
3965 there may be some cunning configuration going on. In the problem case,
3966 log things and give up. The default transport status is already DEFER. */
3967
3968 if (rc == HOST_FOUND_LOCAL && !ob->allow_localhost)
3969 {
3970 for (addr = addrlist; addr; addr = addr->next)
3971 {
3972 addr->basic_errno = 0;
3973 addr->message = string_sprintf("%s transport found host %s to be "
3974 "local", tblock->name, host->name);
3975 }
3976 goto END_TRANSPORT;
3977 }
3978 } /* End of block for IP address lookup */
3979
3980 /* If this is a continued delivery, we are interested only in the host
3981 which matches the name of the existing open channel. The check is put
3982 here after the local host lookup, in case the name gets expanded as a
3983 result of the lookup. Set expired FALSE, to save the outer loop executing
3984 twice. */
3985
3986 if ( continue_hostname
3987 && ( Ustrcmp(continue_hostname, host->name) != 0
3988 || Ustrcmp(continue_host_address, host->address) != 0
3989 ) )
3990 {
3991 expired = FALSE;
3992 continue; /* With next host */
3993 }
3994
3995 /* Reset the default next host in case a multihomed host whose addresses
3996 are not looked up till just above added to the host list. */
3997
3998 nexthost = host->next;
3999
4000 /* If queue_smtp is set (-odqs or the first part of a 2-stage run), or the
4001 domain is in queue_smtp_domains, we don't actually want to attempt any
4002 deliveries. When doing a queue run, queue_smtp_domains is always unset. If
4003 there is a lookup defer in queue_smtp_domains, proceed as if the domain
4004 were not in it. We don't want to hold up all SMTP deliveries! Except when
4005 doing a two-stage queue run, don't do this if forcing. */
4006
4007 if ((!deliver_force || queue_2stage) && (queue_smtp ||
4008 match_isinlist(addrlist->domain,
4009 (const uschar **)&queue_smtp_domains, 0,
4010 &domainlist_anchor, NULL, MCL_DOMAIN, TRUE, NULL) == OK))
4011 {
4012 expired = FALSE;
4013 for (addr = addrlist; addr; addr = addr->next)
4014 if (addr->transport_return == DEFER)
4015 addr->message = US"domain matches queue_smtp_domains, or -odqs set";
4016 continue; /* With next host */
4017 }
4018
4019 /* Count hosts being considered - purely for an intelligent comment
4020 if none are usable. */
4021
4022 hosts_total++;
4023
4024 /* Set $host and $host address now in case they are needed for the
4025 interface expansion or the serialize_hosts check; they remain set if an
4026 actual delivery happens. */
4027
4028 deliver_host = host->name;
4029 deliver_host_address = host->address;
4030 lookup_dnssec_authenticated = host->dnssec == DS_YES ? US"yes"
4031 : host->dnssec == DS_NO ? US"no"
4032 : US"";
4033
4034 /* Set up a string for adding to the retry key if the port number is not
4035 the standard SMTP port. A host may have its own port setting that overrides
4036 the default. */
4037
4038 pistring = string_sprintf(":%d", host->port == PORT_NONE
4039 ? port : host->port);
4040 if (Ustrcmp(pistring, ":25") == 0) pistring = US"";
4041
4042 /* Select IPv4 or IPv6, and choose an outgoing interface. If the interface
4043 string is set, even if constant (as different transports can have different
4044 constant settings), we must add it to the key that is used for retries,
4045 because connections to the same host from a different interface should be
4046 treated separately. */
4047
4048 host_af = Ustrchr(host->address, ':') == NULL ? AF_INET : AF_INET6;
4049 if ((rs = ob->interface) && *rs)
4050 {
4051 if (!smtp_get_interface(rs, host_af, addrlist, &interface, tid))
4052 return FALSE;
4053 pistring = string_sprintf("%s/%s", pistring, interface);
4054 }
4055
4056 /* The first time round the outer loop, check the status of the host by
4057 inspecting the retry data. The second time round, we are interested only
4058 in expired hosts that haven't been tried since this message arrived. */
4059
4060 if (cutoff_retry == 0)
4061 {
4062 BOOL incl_ip;
4063 /* Ensure the status of the address is set by checking retry data if
4064 necessary. There may be host-specific retry data (applicable to all
4065 messages) and also data for retries of a specific message at this host.
4066 If either of these retry records are actually read, the keys used are
4067 returned to save recomputing them later. */
4068
4069 if (exp_bool(addrlist, US"transport", tblock->name, D_transport,
4070 US"retry_include_ip_address", ob->retry_include_ip_address,
4071 ob->expand_retry_include_ip_address, &incl_ip) != OK)
4072 continue; /* with next host */
4073
4074 host_is_expired = retry_check_address(addrlist->domain, host, pistring,
4075 incl_ip, &retry_host_key, &retry_message_key);
4076
4077 DEBUG(D_transport) debug_printf("%s [%s]%s retry-status = %s\n", host->name,
4078 (host->address == NULL)? US"" : host->address, pistring,
4079 (host->status == hstatus_usable)? "usable" :
4080 (host->status == hstatus_unusable)? "unusable" :
4081 (host->status == hstatus_unusable_expired)? "unusable (expired)" : "?");
4082
4083 /* Skip this address if not usable at this time, noting if it wasn't
4084 actually expired, both locally and in the address. */
4085
4086 switch (host->status)
4087 {
4088 case hstatus_unusable:
4089 expired = FALSE;
4090 setflag(addrlist, af_retry_skipped);
4091 /* Fall through */
4092
4093 case hstatus_unusable_expired:
4094 switch (host->why)
4095 {
4096 case hwhy_retry: hosts_retry++; break;
4097 case hwhy_failed: hosts_fail++; break;
4098 case hwhy_insecure:
4099 case hwhy_deferred: hosts_defer++; break;
4100 }
4101
4102 /* If there was a retry message key, implying that previously there
4103 was a message-specific defer, we don't want to update the list of
4104 messages waiting for these hosts. */
4105
4106 if (retry_message_key) update_waiting = FALSE;
4107 continue; /* With the next host or IP address */
4108 }
4109 }
4110
4111 /* Second time round the loop: if the address is set but expired, and
4112 the message is newer than the last try, let it through. */
4113
4114 else
4115 {
4116 if ( !host->address
4117 || host->status != hstatus_unusable_expired
4118 || host->last_try > received_time)
4119 continue;
4120 DEBUG(D_transport) debug_printf("trying expired host %s [%s]%s\n",
4121 host->name, host->address, pistring);
4122 host_is_expired = TRUE;
4123 }
4124
4125 /* Setting "expired=FALSE" doesn't actually mean not all hosts are expired;
4126 it remains TRUE only if all hosts are expired and none are actually tried.
4127 */
4128
4129 expired = FALSE;
4130
4131 /* If this host is listed as one to which access must be serialized,
4132 see if another Exim process has a connection to it, and if so, skip
4133 this host. If not, update the database to record our connection to it
4134 and remember this for later deletion. Do not do any of this if we are
4135 sending the message down a pre-existing connection. */
4136
4137 if ( !continue_hostname
4138 && verify_check_given_host(&ob->serialize_hosts, host) == OK)
4139 {
4140 serialize_key = string_sprintf("host-serialize-%s", host->name);
4141 if (!enq_start(serialize_key, 1))
4142 {
4143 DEBUG(D_transport)
4144 debug_printf("skipping host %s because another Exim process "
4145 "is connected to it\n", host->name);
4146 hosts_serial++;
4147 continue;
4148 }
4149 }
4150
4151 /* OK, we have an IP address that is not waiting for its retry time to
4152 arrive (it might be expired) OR (second time round the loop) we have an
4153 expired host that hasn't been tried since the message arrived. Have a go
4154 at delivering the message to it. First prepare the addresses by flushing
4155 out the result of previous attempts, and finding the first address that
4156 is still to be delivered. */
4157
4158 first_addr = prepare_addresses(addrlist, host);
4159
4160 DEBUG(D_transport) debug_printf("delivering %s to %s [%s] (%s%s)\n",
4161 message_id, host->name, host->address, addrlist->address,
4162 addrlist->next ? ", ..." : "");
4163
4164 set_process_info("delivering %s to %s [%s] (%s%s)",
4165 message_id, host->name, host->address, addrlist->address,
4166 addrlist->next ? ", ..." : "");
4167
4168 /* This is not for real; don't do the delivery. If there are
4169 any remaining hosts, list them. */
4170
4171 if (dont_deliver)
4172 {
4173 host_item *host2;
4174 set_errno_nohost(addrlist, 0, NULL, OK, FALSE);
4175 for (addr = addrlist; addr; addr = addr->next)
4176 {
4177 addr->host_used = host;
4178 addr->special_action = '*';
4179 addr->message = US"delivery bypassed by -N option";
4180 }
4181 DEBUG(D_transport)
4182 {
4183 debug_printf("*** delivery by %s transport bypassed by -N option\n"
4184 "*** host and remaining hosts:\n", tblock->name);
4185 for (host2 = host; host2; host2 = host2->next)
4186 debug_printf(" %s [%s]\n", host2->name,
4187 host2->address ? host2->address : US"unset");
4188 }
4189 rc = OK;
4190 }
4191
4192 /* This is for real. If the host is expired, we don't count it for
4193 hosts_max_retry. This ensures that all hosts must expire before an address
4194 is timed out, unless hosts_max_try_hardlimit (which protects against
4195 lunatic DNS configurations) is reached.
4196
4197 If the host is not expired and we are about to hit the hosts_max_retry
4198 limit, check to see if there is a subsequent hosts with a different MX
4199 value. If so, make that the next host, and don't count this one. This is a
4200 heuristic to make sure that different MXs do get tried. With a normal kind
4201 of retry rule, they would get tried anyway when the earlier hosts were
4202 delayed, but if the domain has a "retry every time" type of rule - as is
4203 often used for the the very large ISPs, that won't happen. */
4204
4205 else
4206 {
4207 host_item * thost;
4208 /* Make a copy of the host if it is local to this invocation
4209 of the transport. */
4210
4211 if (expanded_hosts)
4212 {
4213 thost = store_get(sizeof(host_item));
4214 *thost = *host;
4215 thost->name = string_copy(host->name);
4216 thost->address = string_copy(host->address);
4217 }
4218 else
4219 thost = host;
4220
4221 if (!host_is_expired && ++unexpired_hosts_tried >= ob->hosts_max_try)
4222 {
4223 host_item *h;
4224 DEBUG(D_transport)
4225 debug_printf("hosts_max_try limit reached with this host\n");
4226 for (h = host; h; h = h->next) if (h->mx != host->mx)
4227 {
4228 nexthost = h;
4229 unexpired_hosts_tried--;
4230 DEBUG(D_transport) debug_printf("however, a higher MX host exists "
4231 "and will be tried\n");
4232 break;
4233 }
4234 }
4235
4236 /* Attempt the delivery. */
4237
4238 total_hosts_tried++;
4239 rc = smtp_deliver(addrlist, thost, host_af, port, interface, tblock,
4240 &message_defer, FALSE);
4241
4242 /* Yield is one of:
4243 OK => connection made, each address contains its result;
4244 message_defer is set for message-specific defers (when all
4245 recipients are marked defer)
4246 DEFER => there was a non-message-specific delivery problem;
4247 ERROR => there was a problem setting up the arguments for a filter,
4248 or there was a problem with expanding added headers
4249 */
4250
4251 /* If the result is not OK, there was a non-message-specific problem.
4252 If the result is DEFER, we need to write to the logs saying what happened
4253 for this particular host, except in the case of authentication and TLS
4254 failures, where the log has already been written. If all hosts defer a
4255 general message is written at the end. */
4256
4257 if (rc == DEFER && first_addr->basic_errno != ERRNO_AUTHFAIL
4258 && first_addr->basic_errno != ERRNO_TLSFAILURE)
4259 write_logs(first_addr, host);
4260
4261 #ifndef DISABLE_EVENT
4262 if (rc == DEFER)
4263 deferred_event_raise(first_addr, host);
4264 #endif
4265
4266 /* If STARTTLS was accepted, but there was a failure in setting up the
4267 TLS session (usually a certificate screwup), and the host is not in
4268 hosts_require_tls, and tls_tempfail_tryclear is true, try again, with
4269 TLS forcibly turned off. We have to start from scratch with a new SMTP
4270 connection. That's why the retry is done from here, not from within
4271 smtp_deliver(). [Rejections of STARTTLS itself don't screw up the
4272 session, so the in-clear transmission after those errors, if permitted,
4273 happens inside smtp_deliver().] */
4274
4275 #ifdef SUPPORT_TLS
4276 if ( rc == DEFER
4277 && first_addr->basic_errno == ERRNO_TLSFAILURE
4278 && ob->tls_tempfail_tryclear
4279 && verify_check_given_host(&ob->hosts_require_tls, host) != OK
4280 )
4281 {
4282 log_write(0, LOG_MAIN,
4283 "%s: delivering unencrypted to H=%s [%s] (not in hosts_require_tls)",
4284 first_addr->message, host->name, host->address);
4285 first_addr = prepare_addresses(addrlist, host);
4286 rc = smtp_deliver(addrlist, thost, host_af, port, interface, tblock,
4287 &message_defer, TRUE);
4288 if (rc == DEFER && first_addr->basic_errno != ERRNO_AUTHFAIL)
4289 write_logs(first_addr, host);
4290 # ifndef DISABLE_EVENT
4291 if (rc == DEFER)
4292 deferred_event_raise(first_addr, host);
4293 # endif
4294 }
4295 #endif /*SUPPORT_TLS*/
4296 }
4297
4298 /* Delivery attempt finished */
4299
4300 rs = rc == OK ? US"OK"
4301 : rc == DEFER ? US"DEFER"
4302 : rc == ERROR ? US"ERROR"
4303 : US"?";
4304
4305 set_process_info("delivering %s: just tried %s [%s] for %s%s: result %s",
4306 message_id, host->name, host->address, addrlist->address,
4307 addrlist->next ? " (& others)" : "", rs);
4308
4309 /* Release serialization if set up */
4310
4311 if (serialize_key) enq_end(serialize_key);
4312
4313 /* If the result is DEFER, or if a host retry record is known to exist, we
4314 need to add an item to the retry chain for updating the retry database
4315 at the end of delivery. We only need to add the item to the top address,
4316 of course. Also, if DEFER, we mark the IP address unusable so as to skip it
4317 for any other delivery attempts using the same address. (It is copied into
4318 the unusable tree at the outer level, so even if different address blocks
4319 contain the same address, it still won't get tried again.) */
4320
4321 if (rc == DEFER || retry_host_key)
4322 {
4323 int delete_flag = rc != DEFER ? rf_delete : 0;
4324 if (!retry_host_key)
4325 {
4326 BOOL incl_ip;
4327 if (exp_bool(addrlist, US"transport", tblock->name, D_transport,
4328 US"retry_include_ip_address", ob->retry_include_ip_address,
4329 ob->expand_retry_include_ip_address, &incl_ip) != OK)
4330 incl_ip = TRUE; /* error; use most-specific retry record */
4331
4332 retry_host_key = incl_ip
4333 ? string_sprintf("T:%S:%s%s", host->name, host->address, pistring)
4334 : string_sprintf("T:%S%s", host->name, pistring);
4335 }
4336
4337 /* If a delivery of another message over an existing SMTP connection
4338 yields DEFER, we do NOT set up retry data for the host. This covers the
4339 case when there are delays in routing the addresses in the second message
4340 that are so long that the server times out. This is alleviated by not
4341 routing addresses that previously had routing defers when handling an
4342 existing connection, but even so, this case may occur (e.g. if a
4343 previously happily routed address starts giving routing defers). If the
4344 host is genuinely down, another non-continued message delivery will
4345 notice it soon enough. */
4346
4347 if (delete_flag != 0 || !continue_hostname)
4348 retry_add_item(first_addr, retry_host_key, rf_host | delete_flag);
4349
4350 /* We may have tried an expired host, if its retry time has come; ensure
4351 the status reflects the expiry for the benefit of any other addresses. */
4352
4353 if (rc == DEFER)
4354 {
4355 host->status = host_is_expired
4356 ? hstatus_unusable_expired : hstatus_unusable;
4357 host->why = hwhy_deferred;
4358 }
4359 }
4360
4361 /* If message_defer is set (host was OK, but every recipient got deferred
4362 because of some message-specific problem), or if that had happened
4363 previously so that a message retry key exists, add an appropriate item
4364 to the retry chain. Note that if there was a message defer but now there is
4365 a host defer, the message defer record gets deleted. That seems perfectly
4366 reasonable. Also, stop the message from being remembered as waiting
4367 for specific hosts. */
4368
4369 if (message_defer || retry_message_key)
4370 {
4371 int delete_flag = message_defer ? 0 : rf_delete;
4372 if (!retry_message_key)
4373 {
4374 BOOL incl_ip;
4375 if (exp_bool(addrlist, US"transport", tblock->name, D_transport,
4376 US"retry_include_ip_address", ob->retry_include_ip_address,
4377 ob->expand_retry_include_ip_address, &incl_ip) != OK)
4378 incl_ip = TRUE; /* error; use most-specific retry record */
4379
4380 retry_message_key = incl_ip
4381 ? string_sprintf("T:%S:%s%s:%s", host->name, host->address, pistring,
4382 message_id)
4383 : string_sprintf("T:%S%s:%s", host->name, pistring, message_id);
4384 }
4385 retry_add_item(addrlist, retry_message_key,
4386 rf_message | rf_host | delete_flag);
4387 update_waiting = FALSE;
4388 }
4389
4390 /* Any return other than DEFER (that is, OK or ERROR) means that the
4391 addresses have got their final statuses filled in for this host. In the OK
4392 case, see if any of them are deferred. */
4393
4394 if (rc == OK)
4395 for (addr = addrlist; addr; addr = addr->next)
4396 if (addr->transport_return == DEFER)
4397 {
4398 some_deferred = TRUE;
4399 break;
4400 }
4401
4402 /* If no addresses deferred or the result was ERROR, return. We do this for
4403 ERROR because a failing filter set-up or add_headers expansion is likely to
4404 fail for any host we try. */
4405
4406 if (rc == ERROR || (rc == OK && !some_deferred))
4407 {
4408 DEBUG(D_transport) debug_printf("Leaving %s transport\n", tblock->name);
4409 return TRUE; /* Each address has its status */
4410 }
4411
4412 /* If the result was DEFER or some individual addresses deferred, let
4413 the loop run to try other hosts with the deferred addresses, except for the
4414 case when we were trying to deliver down an existing channel and failed.
4415 Don't try any other hosts in this case. */
4416
4417 if (continue_hostname) break;
4418
4419 /* If the whole delivery, or some individual addresses, were deferred and
4420 there are more hosts that could be tried, do not count this host towards
4421 the hosts_max_try limit if the age of the message is greater than the
4422 maximum retry time for this host. This means we may try try all hosts,
4423 ignoring the limit, when messages have been around for some time. This is
4424 important because if we don't try all hosts, the address will never time
4425 out. NOTE: this does not apply to hosts_max_try_hardlimit. */
4426
4427 if ((rc == DEFER || some_deferred) && nexthost)
4428 {
4429 BOOL timedout;
4430 retry_config *retry = retry_find_config(host->name, NULL, 0, 0);
4431
4432 if (retry && retry->rules)
4433 {
4434 retry_rule *last_rule;
4435 for (last_rule = retry->rules;
4436 last_rule->next;
4437 last_rule = last_rule->next);
4438 timedout = time(NULL) - received_time > last_rule->timeout;
4439 }
4440 else timedout = TRUE; /* No rule => timed out */
4441
4442 if (timedout)
4443 {
4444 unexpired_hosts_tried--;
4445 DEBUG(D_transport) debug_printf("temporary delivery error(s) override "
4446 "hosts_max_try (message older than host's retry time)\n");
4447 }
4448 }
4449 } /* End of loop for trying multiple hosts. */
4450
4451 /* This is the end of the loop that repeats iff expired is TRUE and
4452 ob->delay_after_cutoff is FALSE. The second time round we will
4453 try those hosts that haven't been tried since the message arrived. */
4454
4455 DEBUG(D_transport)
4456 {
4457 debug_printf("all IP addresses skipped or deferred at least one address\n");
4458 if (expired && !ob->delay_after_cutoff && cutoff_retry == 0)
4459 debug_printf("retrying IP addresses not tried since message arrived\n");
4460 }
4461 }
4462
4463
4464 /* Get here if all IP addresses are skipped or defer at least one address. In
4465 MUA wrapper mode, this will happen only for connection or other non-message-
4466 specific failures. Force the delivery status for all addresses to FAIL. */
4467
4468 if (mua_wrapper)
4469 {
4470 for (addr = addrlist; addr; addr = addr->next)
4471 addr->transport_return = FAIL;
4472 goto END_TRANSPORT;
4473 }
4474
4475 /* In the normal, non-wrapper case, add a standard message to each deferred
4476 address if there hasn't been an error, that is, if it hasn't actually been
4477 tried this time. The variable "expired" will be FALSE if any deliveries were
4478 actually tried, or if there was at least one host that was not expired. That
4479 is, it is TRUE only if no deliveries were tried and all hosts were expired. If
4480 a delivery has been tried, an error code will be set, and the failing of the
4481 message is handled by the retry code later.
4482
4483 If queue_smtp is set, or this transport was called to send a subsequent message
4484 down an existing TCP/IP connection, and something caused the host not to be
4485 found, we end up here, but can detect these cases and handle them specially. */
4486
4487 for (addr = addrlist; addr; addr = addr->next)
4488 {
4489 /* If host is not NULL, it means that we stopped processing the host list
4490 because of hosts_max_try or hosts_max_try_hardlimit. In the former case, this
4491 means we need to behave as if some hosts were skipped because their retry
4492 time had not come. Specifically, this prevents the address from timing out.
4493 However, if we have hit hosts_max_try_hardlimit, we want to behave as if all
4494 hosts were tried. */
4495
4496 if (host)
4497 if (total_hosts_tried >= ob->hosts_max_try_hardlimit)
4498 {
4499 DEBUG(D_transport)
4500 debug_printf("hosts_max_try_hardlimit reached: behave as if all "
4501 "hosts were tried\n");
4502 }
4503 else
4504 {
4505 DEBUG(D_transport)
4506 debug_printf("hosts_max_try limit caused some hosts to be skipped\n");
4507 setflag(addr, af_retry_skipped);
4508 }
4509
4510 if (queue_smtp) /* no deliveries attempted */
4511 {
4512 addr->transport_return = DEFER;
4513 addr->basic_errno = 0;
4514 addr->message = US"SMTP delivery explicitly queued";
4515 }
4516
4517 else if ( addr->transport_return == DEFER
4518 && (addr->basic_errno == ERRNO_UNKNOWNERROR || addr->basic_errno == 0)
4519 && !addr->message
4520 )
4521 {
4522 addr->basic_errno = ERRNO_HRETRY;
4523 if (continue_hostname)
4524 addr->message = US"no host found for existing SMTP connection";
4525 else if (expired)
4526 {
4527 setflag(addr, af_pass_message); /* This is not a security risk */
4528 addr->message = string_sprintf(
4529 "all hosts%s have been failing for a long time %s",
4530 addr->domain ? string_sprintf(" for '%s'", addr->domain) : US"",
4531 ob->delay_after_cutoff
4532 ? US"(and retry time not reached)"
4533 : US"and were last tried after this message arrived");
4534
4535 /* If we are already using fallback hosts, or there are no fallback hosts
4536 defined, convert the result to FAIL to cause a bounce. */
4537
4538 if (addr->host_list == addr->fallback_hosts || !addr->fallback_hosts)
4539 addr->transport_return = FAIL;
4540 }
4541 else
4542 {
4543 const char * s;
4544 if (hosts_retry == hosts_total)
4545 s = "retry time not reached for any host%s";
4546 else if (hosts_fail == hosts_total)
4547 s = "all host address lookups%s failed permanently";
4548 else if (hosts_defer == hosts_total)
4549 s = "all host address lookups%s failed temporarily";
4550 else if (hosts_serial == hosts_total)
4551 s = "connection limit reached for all hosts%s";
4552 else if (hosts_fail+hosts_defer == hosts_total)
4553 s = "all host address lookups%s failed";
4554 else
4555 s = "some host address lookups failed and retry time "
4556 "not reached for other hosts or connection limit reached%s";
4557
4558 addr->message = string_sprintf(s,
4559 addr->domain ? string_sprintf(" for '%s'", addr->domain) : US"");
4560 }
4561 }
4562 }
4563
4564 /* Update the database which keeps information about which messages are waiting
4565 for which hosts to become available. For some message-specific errors, the
4566 update_waiting flag is turned off because we don't want follow-on deliveries in
4567 those cases. If this transport instance is explicitly limited to one message
4568 per connection then follow-on deliveries are not possible and there's no need
4569 to create/update the per-transport wait-<transport_name> database. */
4570
4571 if (update_waiting && tblock->connection_max_messages != 1)
4572 transport_update_waiting(hostlist, tblock->name);
4573
4574 END_TRANSPORT:
4575
4576 DEBUG(D_transport) debug_printf("Leaving %s transport\n", tblock->name);
4577
4578 return TRUE; /* Each address has its status */
4579 }
4580
4581 /* vi: aw ai sw=2
4582 */
4583 /* End of transport/smtp.c */
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