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[exim.git] / src / src / transports / smtp.c
1 /*************************************************
2 * Exim - an Internet mail transport agent *
3 *************************************************/
4
5 /* Copyright (c) University of Cambridge 1995 - 2017 */
6 /* See the file NOTICE for conditions of use and distribution. */
7
8 #include "../exim.h"
9 #include "smtp.h"
10
11
12 /* Options specific to the smtp transport. This transport also supports LMTP
13 over TCP/IP. The options must be in alphabetic order (note that "_" comes
14 before the lower case letters). Some live in the transport_instance block so as
15 to be publicly visible; these are flagged with opt_public. */
16
17 optionlist smtp_transport_options[] = {
18 { "*expand_multi_domain", opt_stringptr | opt_hidden | opt_public,
19 (void *)offsetof(transport_instance, expand_multi_domain) },
20 { "*expand_retry_include_ip_address", opt_stringptr | opt_hidden,
21 (void *)(offsetof(smtp_transport_options_block, expand_retry_include_ip_address)) },
22
23 { "address_retry_include_sender", opt_bool,
24 (void *)offsetof(smtp_transport_options_block, address_retry_include_sender) },
25 { "allow_localhost", opt_bool,
26 (void *)offsetof(smtp_transport_options_block, allow_localhost) },
27 { "authenticated_sender", opt_stringptr,
28 (void *)offsetof(smtp_transport_options_block, authenticated_sender) },
29 { "authenticated_sender_force", opt_bool,
30 (void *)offsetof(smtp_transport_options_block, authenticated_sender_force) },
31 { "command_timeout", opt_time,
32 (void *)offsetof(smtp_transport_options_block, command_timeout) },
33 { "connect_timeout", opt_time,
34 (void *)offsetof(smtp_transport_options_block, connect_timeout) },
35 { "connection_max_messages", opt_int | opt_public,
36 (void *)offsetof(transport_instance, connection_max_messages) },
37 { "data_timeout", opt_time,
38 (void *)offsetof(smtp_transport_options_block, data_timeout) },
39 { "delay_after_cutoff", opt_bool,
40 (void *)offsetof(smtp_transport_options_block, delay_after_cutoff) },
41 #ifndef DISABLE_DKIM
42 { "dkim_canon", opt_stringptr,
43 (void *)offsetof(smtp_transport_options_block, dkim.dkim_canon) },
44 { "dkim_domain", opt_stringptr,
45 (void *)offsetof(smtp_transport_options_block, dkim.dkim_domain) },
46 { "dkim_hash", opt_stringptr,
47 (void *)offsetof(smtp_transport_options_block, dkim.dkim_hash) },
48 { "dkim_identity", opt_stringptr,
49 (void *)offsetof(smtp_transport_options_block, dkim.dkim_identity) },
50 { "dkim_private_key", opt_stringptr,
51 (void *)offsetof(smtp_transport_options_block, dkim.dkim_private_key) },
52 { "dkim_selector", opt_stringptr,
53 (void *)offsetof(smtp_transport_options_block, dkim.dkim_selector) },
54 { "dkim_sign_headers", opt_stringptr,
55 (void *)offsetof(smtp_transport_options_block, dkim.dkim_sign_headers) },
56 { "dkim_strict", opt_stringptr,
57 (void *)offsetof(smtp_transport_options_block, dkim.dkim_strict) },
58 #endif
59 { "dns_qualify_single", opt_bool,
60 (void *)offsetof(smtp_transport_options_block, dns_qualify_single) },
61 { "dns_search_parents", opt_bool,
62 (void *)offsetof(smtp_transport_options_block, dns_search_parents) },
63 { "dnssec_request_domains", opt_stringptr,
64 (void *)offsetof(smtp_transport_options_block, dnssec.request) },
65 { "dnssec_require_domains", opt_stringptr,
66 (void *)offsetof(smtp_transport_options_block, dnssec.require) },
67 { "dscp", opt_stringptr,
68 (void *)offsetof(smtp_transport_options_block, dscp) },
69 { "fallback_hosts", opt_stringptr,
70 (void *)offsetof(smtp_transport_options_block, fallback_hosts) },
71 { "final_timeout", opt_time,
72 (void *)offsetof(smtp_transport_options_block, final_timeout) },
73 { "gethostbyname", opt_bool,
74 (void *)offsetof(smtp_transport_options_block, gethostbyname) },
75 { "helo_data", opt_stringptr,
76 (void *)offsetof(smtp_transport_options_block, helo_data) },
77 { "hosts", opt_stringptr,
78 (void *)offsetof(smtp_transport_options_block, hosts) },
79 { "hosts_avoid_esmtp", opt_stringptr,
80 (void *)offsetof(smtp_transport_options_block, hosts_avoid_esmtp) },
81 { "hosts_avoid_pipelining", opt_stringptr,
82 (void *)offsetof(smtp_transport_options_block, hosts_avoid_pipelining) },
83 #ifdef SUPPORT_TLS
84 { "hosts_avoid_tls", opt_stringptr,
85 (void *)offsetof(smtp_transport_options_block, hosts_avoid_tls) },
86 #endif
87 { "hosts_max_try", opt_int,
88 (void *)offsetof(smtp_transport_options_block, hosts_max_try) },
89 { "hosts_max_try_hardlimit", opt_int,
90 (void *)offsetof(smtp_transport_options_block, hosts_max_try_hardlimit) },
91 #ifdef SUPPORT_TLS
92 { "hosts_nopass_tls", opt_stringptr,
93 (void *)offsetof(smtp_transport_options_block, hosts_nopass_tls) },
94 { "hosts_noproxy_tls", opt_stringptr,
95 (void *)offsetof(smtp_transport_options_block, hosts_noproxy_tls) },
96 #endif
97 { "hosts_override", opt_bool,
98 (void *)offsetof(smtp_transport_options_block, hosts_override) },
99 { "hosts_randomize", opt_bool,
100 (void *)offsetof(smtp_transport_options_block, hosts_randomize) },
101 #if defined(SUPPORT_TLS) && !defined(DISABLE_OCSP)
102 { "hosts_request_ocsp", opt_stringptr,
103 (void *)offsetof(smtp_transport_options_block, hosts_request_ocsp) },
104 #endif
105 { "hosts_require_auth", opt_stringptr,
106 (void *)offsetof(smtp_transport_options_block, hosts_require_auth) },
107 #ifdef SUPPORT_TLS
108 # ifdef EXPERIMENTAL_DANE
109 { "hosts_require_dane", opt_stringptr,
110 (void *)offsetof(smtp_transport_options_block, hosts_require_dane) },
111 # endif
112 # ifndef DISABLE_OCSP
113 { "hosts_require_ocsp", opt_stringptr,
114 (void *)offsetof(smtp_transport_options_block, hosts_require_ocsp) },
115 # endif
116 { "hosts_require_tls", opt_stringptr,
117 (void *)offsetof(smtp_transport_options_block, hosts_require_tls) },
118 #endif
119 { "hosts_try_auth", opt_stringptr,
120 (void *)offsetof(smtp_transport_options_block, hosts_try_auth) },
121 { "hosts_try_chunking", opt_stringptr,
122 (void *)offsetof(smtp_transport_options_block, hosts_try_chunking) },
123 #if defined(SUPPORT_TLS) && defined(EXPERIMENTAL_DANE)
124 { "hosts_try_dane", opt_stringptr,
125 (void *)offsetof(smtp_transport_options_block, hosts_try_dane) },
126 #endif
127 { "hosts_try_fastopen", opt_stringptr,
128 (void *)offsetof(smtp_transport_options_block, hosts_try_fastopen) },
129 #ifndef DISABLE_PRDR
130 { "hosts_try_prdr", opt_stringptr,
131 (void *)offsetof(smtp_transport_options_block, hosts_try_prdr) },
132 #endif
133 #ifdef SUPPORT_TLS
134 { "hosts_verify_avoid_tls", opt_stringptr,
135 (void *)offsetof(smtp_transport_options_block, hosts_verify_avoid_tls) },
136 #endif
137 { "interface", opt_stringptr,
138 (void *)offsetof(smtp_transport_options_block, interface) },
139 { "keepalive", opt_bool,
140 (void *)offsetof(smtp_transport_options_block, keepalive) },
141 { "lmtp_ignore_quota", opt_bool,
142 (void *)offsetof(smtp_transport_options_block, lmtp_ignore_quota) },
143 { "max_rcpt", opt_int | opt_public,
144 (void *)offsetof(transport_instance, max_addresses) },
145 { "multi_domain", opt_expand_bool | opt_public,
146 (void *)offsetof(transport_instance, multi_domain) },
147 { "port", opt_stringptr,
148 (void *)offsetof(smtp_transport_options_block, port) },
149 { "protocol", opt_stringptr,
150 (void *)offsetof(smtp_transport_options_block, protocol) },
151 { "retry_include_ip_address", opt_expand_bool,
152 (void *)offsetof(smtp_transport_options_block, retry_include_ip_address) },
153 { "serialize_hosts", opt_stringptr,
154 (void *)offsetof(smtp_transport_options_block, serialize_hosts) },
155 { "size_addition", opt_int,
156 (void *)offsetof(smtp_transport_options_block, size_addition) }
157 #ifdef SUPPORT_SOCKS
158 ,{ "socks_proxy", opt_stringptr,
159 (void *)offsetof(smtp_transport_options_block, socks_proxy) }
160 #endif
161 #ifdef SUPPORT_TLS
162 ,{ "tls_certificate", opt_stringptr,
163 (void *)offsetof(smtp_transport_options_block, tls_certificate) },
164 { "tls_crl", opt_stringptr,
165 (void *)offsetof(smtp_transport_options_block, tls_crl) },
166 { "tls_dh_min_bits", opt_int,
167 (void *)offsetof(smtp_transport_options_block, tls_dh_min_bits) },
168 { "tls_privatekey", opt_stringptr,
169 (void *)offsetof(smtp_transport_options_block, tls_privatekey) },
170 { "tls_require_ciphers", opt_stringptr,
171 (void *)offsetof(smtp_transport_options_block, tls_require_ciphers) },
172 { "tls_sni", opt_stringptr,
173 (void *)offsetof(smtp_transport_options_block, tls_sni) },
174 { "tls_tempfail_tryclear", opt_bool,
175 (void *)offsetof(smtp_transport_options_block, tls_tempfail_tryclear) },
176 { "tls_try_verify_hosts", opt_stringptr,
177 (void *)offsetof(smtp_transport_options_block, tls_try_verify_hosts) },
178 { "tls_verify_cert_hostnames", opt_stringptr,
179 (void *)offsetof(smtp_transport_options_block,tls_verify_cert_hostnames)},
180 { "tls_verify_certificates", opt_stringptr,
181 (void *)offsetof(smtp_transport_options_block, tls_verify_certificates) },
182 { "tls_verify_hosts", opt_stringptr,
183 (void *)offsetof(smtp_transport_options_block, tls_verify_hosts) }
184 #endif
185 };
186
187 /* Size of the options list. An extern variable has to be used so that its
188 address can appear in the tables drtables.c. */
189
190 int smtp_transport_options_count =
191 sizeof(smtp_transport_options)/sizeof(optionlist);
192
193
194 #ifdef MACRO_PREDEF
195
196 /* Dummy values */
197 smtp_transport_options_block smtp_transport_option_defaults = {0};
198 void smtp_transport_init(transport_instance *tblock) {}
199 BOOL smtp_transport_entry(transport_instance *tblock, address_item *addr) {return FALSE;}
200 void smtp_transport_closedown(transport_instance *tblock) {}
201
202 #else /*!MACRO_PREDEF*/
203
204
205 /* Default private options block for the smtp transport. */
206
207 smtp_transport_options_block smtp_transport_option_defaults = {
208 .hosts = NULL,
209 .hosts = NULL,
210 .hostlist = NULL,
211 .fallback_hostlist = NULL,
212 .authenticated_sender = NULL,
213 .helo_data = US"$primary_hostname",
214 .interface = NULL,
215 .port = NULL,
216 .protocol = US"smtp",
217 .dscp = NULL,
218 .serialize_hosts = NULL,
219 .hosts_try_auth = NULL,
220 .hosts_require_auth = NULL,
221 .hosts_try_chunking = US"*",
222 #ifdef EXPERIMENTAL_DANE
223 .hosts_try_dane = NULL,
224 .hosts_require_dane = NULL,
225 #endif
226 .hosts_try_fastopen = NULL,
227 #ifndef DISABLE_PRDR
228 .hosts_try_prdr = US"*",
229 #endif
230 #ifndef DISABLE_OCSP
231 .hosts_request_ocsp = US"*", /* hosts_request_ocsp (except under DANE; tls_client_start()) */
232 .hosts_require_ocsp = NULL,
233 #endif
234 .hosts_require_tls = NULL,
235 .hosts_avoid_tls = NULL,
236 .hosts_verify_avoid_tls = NULL,
237 .hosts_avoid_pipelining = NULL,
238 .hosts_avoid_esmtp = NULL,
239 #ifdef SUPPORT_TLS
240 .hosts_nopass_tls = NULL,
241 .hosts_noproxy_tls = US"*",
242 #endif
243 .command_timeout = 5*60,
244 .connect_timeout = 5*60,
245 .data_timeout = 5*60,
246 .final_timeout = 10*60,
247 .size_addition = 1024,
248 .hosts_max_try = 5,
249 .hosts_max_try_hardlimit = 50,
250 .address_retry_include_sender = TRUE,
251 .allow_localhost = FALSE,
252 .authenticated_sender_force = FALSE,
253 .gethostbyname = FALSE,
254 .dns_qualify_single = TRUE,
255 .dns_search_parents = FALSE,
256 .dnssec = { .request=NULL, .require=NULL },
257 .delay_after_cutoff = TRUE,
258 .hosts_override = FALSE,
259 .hosts_randomize = FALSE,
260 .keepalive = TRUE,
261 .lmtp_ignore_quota = FALSE,
262 .expand_retry_include_ip_address = NULL,
263 .retry_include_ip_address = TRUE,
264 #ifdef SUPPORT_SOCKS
265 .socks_proxy = NULL,
266 #endif
267 #ifdef SUPPORT_TLS
268 .tls_certificate = NULL,
269 .tls_crl = NULL,
270 .tls_privatekey = NULL,
271 .tls_require_ciphers = NULL,
272 .tls_sni = NULL,
273 .tls_verify_certificates = US"system",
274 .tls_dh_min_bits = EXIM_CLIENT_DH_DEFAULT_MIN_BITS,
275 .tls_tempfail_tryclear = TRUE,
276 .tls_verify_hosts = NULL,
277 .tls_try_verify_hosts = US"*",
278 .tls_verify_cert_hostnames = US"*",
279 #endif
280 #ifndef DISABLE_DKIM
281 .dkim =
282 {.dkim_domain = NULL,
283 .dkim_identity = NULL,
284 .dkim_private_key = NULL,
285 .dkim_selector = NULL,
286 .dkim_canon = NULL,
287 .dkim_sign_headers = NULL,
288 .dkim_strict = NULL,
289 .dkim_hash = US"sha256",
290 .dot_stuffed = FALSE},
291 #endif
292 };
293
294 /* some DSN flags for use later */
295
296 static int rf_list[] = {rf_notify_never, rf_notify_success,
297 rf_notify_failure, rf_notify_delay };
298
299 static uschar *rf_names[] = { US"NEVER", US"SUCCESS", US"FAILURE", US"DELAY" };
300
301
302
303 /* Local statics */
304
305 static uschar *smtp_command; /* Points to last cmd for error messages */
306 static uschar *mail_command; /* Points to MAIL cmd for error messages */
307 static uschar *data_command = US""; /* Points to DATA cmd for error messages */
308 static BOOL update_waiting; /* TRUE to update the "wait" database */
309
310 /*XXX move to smtp_context */
311 static BOOL pipelining_active; /* current transaction is in pipe mode */
312
313
314 /*************************************************
315 * Setup entry point *
316 *************************************************/
317
318 /* This function is called when the transport is about to be used,
319 but before running it in a sub-process. It is used for two things:
320
321 (1) To set the fallback host list in addresses, when delivering.
322 (2) To pass back the interface, port, protocol, and other options, for use
323 during callout verification.
324
325 Arguments:
326 tblock pointer to the transport instance block
327 addrlist list of addresses about to be transported
328 tf if not NULL, pointer to block in which to return options
329 uid the uid that will be set (not used)
330 gid the gid that will be set (not used)
331 errmsg place for error message (not used)
332
333 Returns: OK always (FAIL, DEFER not used)
334 */
335
336 static int
337 smtp_transport_setup(transport_instance *tblock, address_item *addrlist,
338 transport_feedback *tf, uid_t uid, gid_t gid, uschar **errmsg)
339 {
340 smtp_transport_options_block *ob =
341 (smtp_transport_options_block *)(tblock->options_block);
342
343 errmsg = errmsg; /* Keep picky compilers happy */
344 uid = uid;
345 gid = gid;
346
347 /* Pass back options if required. This interface is getting very messy. */
348
349 if (tf)
350 {
351 tf->interface = ob->interface;
352 tf->port = ob->port;
353 tf->protocol = ob->protocol;
354 tf->hosts = ob->hosts;
355 tf->hosts_override = ob->hosts_override;
356 tf->hosts_randomize = ob->hosts_randomize;
357 tf->gethostbyname = ob->gethostbyname;
358 tf->qualify_single = ob->dns_qualify_single;
359 tf->search_parents = ob->dns_search_parents;
360 tf->helo_data = ob->helo_data;
361 }
362
363 /* Set the fallback host list for all the addresses that don't have fallback
364 host lists, provided that the local host wasn't present in the original host
365 list. */
366
367 if (!testflag(addrlist, af_local_host_removed))
368 for (; addrlist; addrlist = addrlist->next)
369 if (!addrlist->fallback_hosts) addrlist->fallback_hosts = ob->fallback_hostlist;
370
371 return OK;
372 }
373
374
375
376 /*************************************************
377 * Initialization entry point *
378 *************************************************/
379
380 /* Called for each instance, after its options have been read, to
381 enable consistency checks to be done, or anything else that needs
382 to be set up.
383
384 Argument: pointer to the transport instance block
385 Returns: nothing
386 */
387
388 void
389 smtp_transport_init(transport_instance *tblock)
390 {
391 smtp_transport_options_block *ob =
392 (smtp_transport_options_block *)(tblock->options_block);
393
394 /* Retry_use_local_part defaults FALSE if unset */
395
396 if (tblock->retry_use_local_part == TRUE_UNSET)
397 tblock->retry_use_local_part = FALSE;
398
399 /* Set the default port according to the protocol */
400
401 if (ob->port == NULL)
402 ob->port = (strcmpic(ob->protocol, US"lmtp") == 0)? US"lmtp" :
403 (strcmpic(ob->protocol, US"smtps") == 0)? US"smtps" : US"smtp";
404
405 /* Set up the setup entry point, to be called before subprocesses for this
406 transport. */
407
408 tblock->setup = smtp_transport_setup;
409
410 /* Complain if any of the timeouts are zero. */
411
412 if (ob->command_timeout <= 0 || ob->data_timeout <= 0 ||
413 ob->final_timeout <= 0)
414 log_write(0, LOG_PANIC_DIE|LOG_CONFIG,
415 "command, data, or final timeout value is zero for %s transport",
416 tblock->name);
417
418 /* If hosts_override is set and there are local hosts, set the global
419 flag that stops verify from showing router hosts. */
420
421 if (ob->hosts_override && ob->hosts != NULL) tblock->overrides_hosts = TRUE;
422
423 /* If there are any fallback hosts listed, build a chain of host items
424 for them, but do not do any lookups at this time. */
425
426 host_build_hostlist(&(ob->fallback_hostlist), ob->fallback_hosts, FALSE);
427 }
428
429
430
431
432
433 /*************************************************
434 * Set delivery info into all active addresses *
435 *************************************************/
436
437 /* Only addresses whose status is >= PENDING are relevant. A lesser
438 status means that an address is not currently being processed.
439
440 Arguments:
441 addrlist points to a chain of addresses
442 errno_value to put in each address's errno field
443 msg to put in each address's message field
444 rc to put in each address's transport_return field
445 pass_message if TRUE, set the "pass message" flag in the address
446 host if set, mark addrs as having used this host
447 smtp_greeting from peer
448 helo_response from peer
449
450 If errno_value has the special value ERRNO_CONNECTTIMEOUT, ETIMEDOUT is put in
451 the errno field, and RTEF_CTOUT is ORed into the more_errno field, to indicate
452 this particular type of timeout.
453
454 Returns: nothing
455 */
456
457 static void
458 set_errno(address_item *addrlist, int errno_value, uschar *msg, int rc,
459 BOOL pass_message, host_item * host
460 #ifdef EXPERIMENTAL_DSN_INFO
461 , const uschar * smtp_greeting, const uschar * helo_response
462 #endif
463 )
464 {
465 address_item *addr;
466 int orvalue = 0;
467 if (errno_value == ERRNO_CONNECTTIMEOUT)
468 {
469 errno_value = ETIMEDOUT;
470 orvalue = RTEF_CTOUT;
471 }
472 for (addr = addrlist; addr; addr = addr->next)
473 if (addr->transport_return >= PENDING)
474 {
475 addr->basic_errno = errno_value;
476 addr->more_errno |= orvalue;
477 if (msg)
478 {
479 addr->message = msg;
480 if (pass_message) setflag(addr, af_pass_message);
481 }
482 addr->transport_return = rc;
483 if (host)
484 {
485 addr->host_used = host;
486 #ifdef EXPERIMENTAL_DSN_INFO
487 if (smtp_greeting)
488 {uschar * s = Ustrchr(smtp_greeting, '\n'); if (s) *s = '\0';}
489 addr->smtp_greeting = smtp_greeting;
490
491 if (helo_response)
492 {uschar * s = Ustrchr(helo_response, '\n'); if (s) *s = '\0';}
493 addr->helo_response = helo_response;
494 #endif
495 }
496 }
497 }
498
499 static void
500 set_errno_nohost(address_item *addrlist, int errno_value, uschar *msg, int rc,
501 BOOL pass_message)
502 {
503 set_errno(addrlist, errno_value, msg, rc, pass_message, NULL
504 #ifdef EXPERIMENTAL_DSN_INFO
505 , NULL, NULL
506 #endif
507 );
508 }
509
510
511 /*************************************************
512 * Check an SMTP response *
513 *************************************************/
514
515 /* This function is given an errno code and the SMTP response buffer
516 to analyse, together with the host identification for generating messages. It
517 sets an appropriate message and puts the first digit of the response code into
518 the yield variable. If no response was actually read, a suitable digit is
519 chosen.
520
521 Arguments:
522 host the current host, to get its name for messages
523 errno_value pointer to the errno value
524 more_errno from the top address for use with ERRNO_FILTER_FAIL
525 buffer the SMTP response buffer
526 yield where to put a one-digit SMTP response code
527 message where to put an error message
528 pass_message set TRUE if message is an SMTP response
529
530 Returns: TRUE if an SMTP "QUIT" command should be sent, else FALSE
531 */
532
533 static BOOL
534 check_response(host_item *host, int *errno_value, int more_errno,
535 uschar *buffer, int *yield, uschar **message, BOOL *pass_message)
536 {
537 uschar * pl = pipelining_active ? US"pipelined " : US"";
538 const uschar * s;
539
540 *yield = '4'; /* Default setting is to give a temporary error */
541
542 switch(*errno_value)
543 {
544 case ETIMEDOUT: /* Handle response timeout */
545 *message = US string_sprintf("SMTP timeout after %s%s",
546 pl, smtp_command);
547 if (transport_count > 0)
548 *message = US string_sprintf("%s (%d bytes written)", *message,
549 transport_count);
550 return FALSE;
551
552 case ERRNO_SMTPFORMAT: /* Handle malformed SMTP response */
553 s = string_printing(buffer);
554 while (isspace(*s)) s++;
555 *message = *s == 0
556 ? string_sprintf("Malformed SMTP reply (an empty line) "
557 "in response to %s%s", pl, smtp_command)
558 : string_sprintf("Malformed SMTP reply in response to %s%s: %s",
559 pl, smtp_command, s);
560 return FALSE;
561
562 case ERRNO_FILTER_FAIL: /* Handle a failed filter process error;
563 can't send QUIT as we mustn't end the DATA. */
564 *message = string_sprintf("transport filter process failed (%d)%s",
565 more_errno,
566 more_errno == EX_EXECFAILED ? ": unable to execute command" : "");
567 return FALSE;
568
569 case ERRNO_CHHEADER_FAIL: /* Handle a failed add_headers expansion;
570 can't send QUIT as we mustn't end the DATA. */
571 *message =
572 string_sprintf("failed to expand headers_add or headers_remove: %s",
573 expand_string_message);
574 return FALSE;
575
576 case ERRNO_WRITEINCOMPLETE: /* failure to write a complete data block */
577 *message = string_sprintf("failed to write a data block");
578 return FALSE;
579
580 #ifdef SUPPORT_I18N
581 case ERRNO_UTF8_FWD: /* no advertised SMTPUTF8, for international message */
582 *message = US"utf8 support required but not offered for forwarding";
583 DEBUG(D_deliver|D_transport) debug_printf("%s\n", *message);
584 return TRUE;
585 #endif
586 }
587
588 /* Handle error responses from the remote mailer. */
589
590 if (buffer[0] != 0)
591 {
592 *message = string_sprintf("SMTP error from remote mail server after %s%s: "
593 "%s", pl, smtp_command, s = string_printing(buffer));
594 *pass_message = TRUE;
595 *yield = buffer[0];
596 return TRUE;
597 }
598
599 /* No data was read. If there is no errno, this must be the EOF (i.e.
600 connection closed) case, which causes deferral. An explicit connection reset
601 error has the same effect. Otherwise, put the host's identity in the message,
602 leaving the errno value to be interpreted as well. In all cases, we have to
603 assume the connection is now dead. */
604
605 if (*errno_value == 0 || *errno_value == ECONNRESET)
606 {
607 *errno_value = ERRNO_SMTPCLOSED;
608 *message = US string_sprintf("Remote host closed connection "
609 "in response to %s%s", pl, smtp_command);
610 }
611 else
612 *message = US string_sprintf("%s [%s]", host->name, host->address);
613
614 return FALSE;
615 }
616
617
618
619 /*************************************************
620 * Write error message to logs *
621 *************************************************/
622
623 /* This writes to the main log and to the message log.
624
625 Arguments:
626 addr the address item containing error information
627 host the current host
628
629 Returns: nothing
630 */
631
632 static void
633 write_logs(address_item *addr, host_item *host)
634 {
635 uschar * message = LOGGING(outgoing_port)
636 ? string_sprintf("H=%s [%s]:%d", host->name, host->address,
637 host->port == PORT_NONE ? 25 : host->port)
638 : string_sprintf("H=%s [%s]", host->name, host->address);
639
640 if (addr->message)
641 {
642 message = string_sprintf("%s: %s", message, addr->message);
643 if (addr->basic_errno > 0)
644 message = string_sprintf("%s: %s", message, strerror(addr->basic_errno));
645 log_write(0, LOG_MAIN, "%s", message);
646 deliver_msglog("%s %s\n", tod_stamp(tod_log), message);
647 }
648 else
649 {
650 const uschar * s = exim_errstr(addr->basic_errno);
651 log_write(0, LOG_MAIN, "%s %s", message, s);
652 deliver_msglog("%s %s %s\n", tod_stamp(tod_log), message, s);
653 }
654 }
655
656 static void
657 msglog_line(host_item * host, uschar * message)
658 {
659 deliver_msglog("%s H=%s [%s] %s\n", tod_stamp(tod_log),
660 host->name, host->address, message);
661 }
662
663
664
665 #ifndef DISABLE_EVENT
666 /*************************************************
667 * Post-defer action *
668 *************************************************/
669
670 /* This expands an arbitrary per-transport string.
671 It might, for example, be used to write to the database log.
672
673 Arguments:
674 addr the address item containing error information
675 host the current host
676
677 Returns: nothing
678 */
679
680 static void
681 deferred_event_raise(address_item *addr, host_item *host)
682 {
683 uschar * action = addr->transport->event_action;
684 const uschar * save_domain;
685 uschar * save_local;
686
687 if (!action)
688 return;
689
690 save_domain = deliver_domain;
691 save_local = deliver_localpart;
692
693 /*XXX would ip & port already be set up? */
694 deliver_host_address = string_copy(host->address);
695 deliver_host_port = host->port == PORT_NONE ? 25 : host->port;
696 event_defer_errno = addr->basic_errno;
697
698 router_name = addr->router->name;
699 transport_name = addr->transport->name;
700 deliver_domain = addr->domain;
701 deliver_localpart = addr->local_part;
702
703 (void) event_raise(action, US"msg:host:defer",
704 addr->message
705 ? addr->basic_errno > 0
706 ? string_sprintf("%s: %s", addr->message, strerror(addr->basic_errno))
707 : string_copy(addr->message)
708 : addr->basic_errno > 0
709 ? string_copy(US strerror(addr->basic_errno))
710 : NULL);
711
712 deliver_localpart = save_local;
713 deliver_domain = save_domain;
714 router_name = transport_name = NULL;
715 }
716 #endif
717
718 /*************************************************
719 * Synchronize SMTP responses *
720 *************************************************/
721
722 /* This function is called from smtp_deliver() to receive SMTP responses from
723 the server, and match them up with the commands to which they relate. When
724 PIPELINING is not in use, this function is called after every command, and is
725 therefore somewhat over-engineered, but it is simpler to use a single scheme
726 that works both with and without PIPELINING instead of having two separate sets
727 of code.
728
729 The set of commands that are buffered up with pipelining may start with MAIL
730 and may end with DATA; in between are RCPT commands that correspond to the
731 addresses whose status is PENDING_DEFER. All other commands (STARTTLS, AUTH,
732 etc.) are never buffered.
733
734 Errors after MAIL or DATA abort the whole process leaving the response in the
735 buffer. After MAIL, pending responses are flushed, and the original command is
736 re-instated in big_buffer for error messages. For RCPT commands, the remote is
737 permitted to reject some recipient addresses while accepting others. However
738 certain errors clearly abort the whole process. Set the value in
739 transport_return to PENDING_OK if the address is accepted. If there is a
740 subsequent general error, it will get reset accordingly. If not, it will get
741 converted to OK at the end.
742
743 Arguments:
744 sx smtp connection context
745 count the number of responses to read
746 pending_DATA 0 if last command sent was not DATA
747 +1 if previously had a good recipient
748 -1 if not previously had a good recipient
749
750 Returns: 3 if at least one address had 2xx and one had 5xx
751 2 if at least one address had 5xx but none had 2xx
752 1 if at least one host had a 2xx response, but none had 5xx
753 0 no address had 2xx or 5xx but no errors (all 4xx, or just DATA)
754 -1 timeout while reading RCPT response
755 -2 I/O or other non-response error for RCPT
756 -3 DATA or MAIL failed - errno and buffer set
757 */
758
759 static int
760 sync_responses(smtp_context * sx, int count, int pending_DATA)
761 {
762 address_item *addr = sx->sync_addr;
763 smtp_transport_options_block *ob =
764 (smtp_transport_options_block *)sx->tblock->options_block;
765 int yield = 0;
766
767 /* Handle the response for a MAIL command. On error, reinstate the original
768 command in big_buffer for error message use, and flush any further pending
769 responses before returning, except after I/O errors and timeouts. */
770
771 if (sx->pending_MAIL)
772 {
773 count--;
774 if (!smtp_read_response(&sx->inblock, sx->buffer, sizeof(sx->buffer),
775 '2', ob->command_timeout))
776 {
777 DEBUG(D_transport) debug_printf("bad response for MAIL\n");
778 Ustrcpy(big_buffer, mail_command); /* Fits, because it came from there! */
779 if (errno == 0 && sx->buffer[0] != 0)
780 {
781 uschar flushbuffer[4096];
782 int save_errno = 0;
783 if (sx->buffer[0] == '4')
784 {
785 save_errno = ERRNO_MAIL4XX;
786 addr->more_errno |= ((sx->buffer[1] - '0')*10 + sx->buffer[2] - '0') << 8;
787 }
788 while (count-- > 0)
789 {
790 if (!smtp_read_response(&sx->inblock, flushbuffer, sizeof(flushbuffer),
791 '2', ob->command_timeout)
792 && (errno != 0 || flushbuffer[0] == 0))
793 break;
794 }
795 errno = save_errno;
796 }
797
798 if (pending_DATA) count--; /* Number of RCPT responses to come */
799 while (count-- > 0) /* Mark any pending addrs with the host used */
800 {
801 while (addr->transport_return != PENDING_DEFER) addr = addr->next;
802 addr->host_used = sx->host;
803 addr = addr->next;
804 }
805 return -3;
806 }
807 }
808
809 if (pending_DATA) count--; /* Number of RCPT responses to come */
810
811 /* Read and handle the required number of RCPT responses, matching each one up
812 with an address by scanning for the next address whose status is PENDING_DEFER.
813 */
814
815 while (count-- > 0)
816 {
817 while (addr->transport_return != PENDING_DEFER)
818 if (!(addr = addr->next))
819 return -2;
820
821 /* The address was accepted */
822 addr->host_used = sx->host;
823
824 if (smtp_read_response(&sx->inblock, sx->buffer, sizeof(sx->buffer),
825 '2', ob->command_timeout))
826 {
827 yield |= 1;
828 addr->transport_return = PENDING_OK;
829
830 /* If af_dr_retry_exists is set, there was a routing delay on this address;
831 ensure that any address-specific retry record is expunged. We do this both
832 for the basic key and for the version that also includes the sender. */
833
834 if (testflag(addr, af_dr_retry_exists))
835 {
836 uschar *altkey = string_sprintf("%s:<%s>", addr->address_retry_key,
837 sender_address);
838 retry_add_item(addr, altkey, rf_delete);
839 retry_add_item(addr, addr->address_retry_key, rf_delete);
840 }
841 }
842
843 /* Timeout while reading the response */
844
845 else if (errno == ETIMEDOUT)
846 {
847 uschar *message = string_sprintf("SMTP timeout after RCPT TO:<%s>",
848 transport_rcpt_address(addr, sx->tblock->rcpt_include_affixes));
849 set_errno_nohost(sx->first_addr, ETIMEDOUT, message, DEFER, FALSE);
850 retry_add_item(addr, addr->address_retry_key, 0);
851 update_waiting = FALSE;
852 return -1;
853 }
854
855 /* Handle other errors in obtaining an SMTP response by returning -1. This
856 will cause all the addresses to be deferred. Restore the SMTP command in
857 big_buffer for which we are checking the response, so the error message
858 makes sense. */
859
860 else if (errno != 0 || sx->buffer[0] == 0)
861 {
862 string_format(big_buffer, big_buffer_size, "RCPT TO:<%s>",
863 transport_rcpt_address(addr, sx->tblock->rcpt_include_affixes));
864 return -2;
865 }
866
867 /* Handle SMTP permanent and temporary response codes. */
868
869 else
870 {
871 addr->message =
872 string_sprintf("SMTP error from remote mail server after RCPT TO:<%s>: "
873 "%s", transport_rcpt_address(addr, sx->tblock->rcpt_include_affixes),
874 string_printing(sx->buffer));
875 setflag(addr, af_pass_message);
876 if (!sx->verify)
877 msglog_line(sx->host, addr->message);
878
879 /* The response was 5xx */
880
881 if (sx->buffer[0] == '5')
882 {
883 addr->transport_return = FAIL;
884 yield |= 2;
885 }
886
887 /* The response was 4xx */
888
889 else
890 {
891 addr->transport_return = DEFER;
892 addr->basic_errno = ERRNO_RCPT4XX;
893 addr->more_errno |= ((sx->buffer[1] - '0')*10 + sx->buffer[2] - '0') << 8;
894
895 if (!sx->verify)
896 {
897 #ifndef DISABLE_EVENT
898 event_defer_errno = addr->more_errno;
899 msg_event_raise(US"msg:rcpt:host:defer", addr);
900 #endif
901
902 /* Log temporary errors if there are more hosts to be tried.
903 If not, log this last one in the == line. */
904
905 if (sx->host->next)
906 log_write(0, LOG_MAIN, "H=%s [%s]: %s",
907 sx->host->name, sx->host->address, addr->message);
908
909 #ifndef DISABLE_EVENT
910 else
911 msg_event_raise(US"msg:rcpt:defer", addr);
912 #endif
913
914 /* Do not put this message on the list of those waiting for specific
915 hosts, as otherwise it is likely to be tried too often. */
916
917 update_waiting = FALSE;
918
919 /* Add a retry item for the address so that it doesn't get tried again
920 too soon. If address_retry_include_sender is true, add the sender address
921 to the retry key. */
922
923 retry_add_item(addr,
924 ob->address_retry_include_sender
925 ? string_sprintf("%s:<%s>", addr->address_retry_key, sender_address)
926 : addr->address_retry_key,
927 0);
928 }
929 }
930 }
931 } /* Loop for next RCPT response */
932
933 /* Update where to start at for the next block of responses, unless we
934 have already handled all the addresses. */
935
936 if (addr) sx->sync_addr = addr->next;
937
938 /* Handle a response to DATA. If we have not had any good recipients, either
939 previously or in this block, the response is ignored. */
940
941 if (pending_DATA != 0 &&
942 !smtp_read_response(&sx->inblock, sx->buffer, sizeof(sx->buffer),
943 '3', ob->command_timeout))
944 {
945 int code;
946 uschar *msg;
947 BOOL pass_message;
948 if (pending_DATA > 0 || (yield & 1) != 0)
949 {
950 if (errno == 0 && sx->buffer[0] == '4')
951 {
952 errno = ERRNO_DATA4XX;
953 sx->first_addr->more_errno |= ((sx->buffer[1] - '0')*10 + sx->buffer[2] - '0') << 8;
954 }
955 return -3;
956 }
957 (void)check_response(sx->host, &errno, 0, sx->buffer, &code, &msg, &pass_message);
958 DEBUG(D_transport) debug_printf("%s\nerror for DATA ignored: pipelining "
959 "is in use and there were no good recipients\n", msg);
960 }
961
962 /* All responses read and handled; MAIL (if present) received 2xx and DATA (if
963 present) received 3xx. If any RCPTs were handled and yielded anything other
964 than 4xx, yield will be set non-zero. */
965
966 return yield;
967 }
968
969
970
971 /* Do the client side of smtp-level authentication */
972 /*
973 Arguments:
974 buffer EHLO response from server (gets overwritten)
975 addrlist chain of potential addresses to deliver
976 host host to deliver to
977 ob transport options
978 ibp, obp comms channel control blocks
979
980 Returns:
981 OK Success, or failed (but not required): global "smtp_authenticated" set
982 DEFER Failed authentication (and was required)
983 ERROR Internal problem
984
985 FAIL_SEND Failed communications - transmit
986 FAIL - response
987 */
988
989 int
990 smtp_auth(uschar *buffer, unsigned bufsize, address_item *addrlist, host_item *host,
991 smtp_transport_options_block *ob, BOOL is_esmtp,
992 smtp_inblock *ibp, smtp_outblock *obp)
993 {
994 int require_auth;
995 uschar *fail_reason = US"server did not advertise AUTH support";
996
997 smtp_authenticated = FALSE;
998 client_authenticator = client_authenticated_id = client_authenticated_sender = NULL;
999 require_auth = verify_check_given_host(&ob->hosts_require_auth, host);
1000
1001 if (is_esmtp && !regex_AUTH) regex_AUTH =
1002 regex_must_compile(US"\\n250[\\s\\-]AUTH\\s+([\\-\\w\\s]+)(?:\\n|$)",
1003 FALSE, TRUE);
1004
1005 if (is_esmtp && regex_match_and_setup(regex_AUTH, buffer, 0, -1))
1006 {
1007 uschar *names = string_copyn(expand_nstring[1], expand_nlength[1]);
1008 expand_nmax = -1; /* reset */
1009
1010 /* Must not do this check until after we have saved the result of the
1011 regex match above. */
1012
1013 if (require_auth == OK ||
1014 verify_check_given_host(&ob->hosts_try_auth, host) == OK)
1015 {
1016 auth_instance *au;
1017 fail_reason = US"no common mechanisms were found";
1018
1019 DEBUG(D_transport) debug_printf("scanning authentication mechanisms\n");
1020
1021 /* Scan the configured authenticators looking for one which is configured
1022 for use as a client, which is not suppressed by client_condition, and
1023 whose name matches an authentication mechanism supported by the server.
1024 If one is found, attempt to authenticate by calling its client function.
1025 */
1026
1027 for (au = auths; !smtp_authenticated && au; au = au->next)
1028 {
1029 uschar *p = names;
1030 if (!au->client ||
1031 (au->client_condition != NULL &&
1032 !expand_check_condition(au->client_condition, au->name,
1033 US"client authenticator")))
1034 {
1035 DEBUG(D_transport) debug_printf("skipping %s authenticator: %s\n",
1036 au->name,
1037 (au->client)? "client_condition is false" :
1038 "not configured as a client");
1039 continue;
1040 }
1041
1042 /* Loop to scan supported server mechanisms */
1043
1044 while (*p)
1045 {
1046 int rc;
1047 int len = Ustrlen(au->public_name);
1048 while (isspace(*p)) p++;
1049
1050 if (strncmpic(au->public_name, p, len) != 0 ||
1051 (p[len] != 0 && !isspace(p[len])))
1052 {
1053 while (*p != 0 && !isspace(*p)) p++;
1054 continue;
1055 }
1056
1057 /* Found data for a listed mechanism. Call its client entry. Set
1058 a flag in the outblock so that data is overwritten after sending so
1059 that reflections don't show it. */
1060
1061 fail_reason = US"authentication attempt(s) failed";
1062 obp->authenticating = TRUE;
1063 rc = (au->info->clientcode)(au, ibp, obp,
1064 ob->command_timeout, buffer, bufsize);
1065 obp->authenticating = FALSE;
1066 DEBUG(D_transport) debug_printf("%s authenticator yielded %d\n",
1067 au->name, rc);
1068
1069 /* A temporary authentication failure must hold up delivery to
1070 this host. After a permanent authentication failure, we carry on
1071 to try other authentication methods. If all fail hard, try to
1072 deliver the message unauthenticated unless require_auth was set. */
1073
1074 switch(rc)
1075 {
1076 case OK:
1077 smtp_authenticated = TRUE; /* stops the outer loop */
1078 client_authenticator = au->name;
1079 if (au->set_client_id != NULL)
1080 client_authenticated_id = expand_string(au->set_client_id);
1081 break;
1082
1083 /* Failure after writing a command */
1084
1085 case FAIL_SEND:
1086 return FAIL_SEND;
1087
1088 /* Failure after reading a response */
1089
1090 case FAIL:
1091 if (errno != 0 || buffer[0] != '5') return FAIL;
1092 log_write(0, LOG_MAIN, "%s authenticator failed H=%s [%s] %s",
1093 au->name, host->name, host->address, buffer);
1094 break;
1095
1096 /* Failure by some other means. In effect, the authenticator
1097 decided it wasn't prepared to handle this case. Typically this
1098 is the result of "fail" in an expansion string. Do we need to
1099 log anything here? Feb 2006: a message is now put in the buffer
1100 if logging is required. */
1101
1102 case CANCELLED:
1103 if (*buffer != 0)
1104 log_write(0, LOG_MAIN, "%s authenticator cancelled "
1105 "authentication H=%s [%s] %s", au->name, host->name,
1106 host->address, buffer);
1107 break;
1108
1109 /* Internal problem, message in buffer. */
1110
1111 case ERROR:
1112 set_errno_nohost(addrlist, ERRNO_AUTHPROB, string_copy(buffer),
1113 DEFER, FALSE);
1114 return ERROR;
1115 }
1116
1117 break; /* If not authenticated, try next authenticator */
1118 } /* Loop for scanning supported server mechanisms */
1119 } /* Loop for further authenticators */
1120 }
1121 }
1122
1123 /* If we haven't authenticated, but are required to, give up. */
1124
1125 if (require_auth == OK && !smtp_authenticated)
1126 {
1127 set_errno_nohost(addrlist, ERRNO_AUTHFAIL,
1128 string_sprintf("authentication required but %s", fail_reason), DEFER,
1129 FALSE);
1130 return DEFER;
1131 }
1132
1133 return OK;
1134 }
1135
1136
1137 /* Construct AUTH appendix string for MAIL TO */
1138 /*
1139 Arguments
1140 buffer to build string
1141 addrlist chain of potential addresses to deliver
1142 ob transport options
1143
1144 Globals smtp_authenticated
1145 client_authenticated_sender
1146 Return True on error, otherwise buffer has (possibly empty) terminated string
1147 */
1148
1149 BOOL
1150 smtp_mail_auth_str(uschar *buffer, unsigned bufsize, address_item *addrlist,
1151 smtp_transport_options_block *ob)
1152 {
1153 uschar *local_authenticated_sender = authenticated_sender;
1154
1155 #ifdef notdef
1156 debug_printf("smtp_mail_auth_str: as<%s> os<%s> SA<%s>\n", authenticated_sender, ob->authenticated_sender, smtp_authenticated?"Y":"N");
1157 #endif
1158
1159 if (ob->authenticated_sender != NULL)
1160 {
1161 uschar *new = expand_string(ob->authenticated_sender);
1162 if (new == NULL)
1163 {
1164 if (!expand_string_forcedfail)
1165 {
1166 uschar *message = string_sprintf("failed to expand "
1167 "authenticated_sender: %s", expand_string_message);
1168 set_errno_nohost(addrlist, ERRNO_EXPANDFAIL, message, DEFER, FALSE);
1169 return TRUE;
1170 }
1171 }
1172 else if (new[0] != 0) local_authenticated_sender = new;
1173 }
1174
1175 /* Add the authenticated sender address if present */
1176
1177 if ((smtp_authenticated || ob->authenticated_sender_force) &&
1178 local_authenticated_sender != NULL)
1179 {
1180 string_format(buffer, bufsize, " AUTH=%s",
1181 auth_xtextencode(local_authenticated_sender,
1182 Ustrlen(local_authenticated_sender)));
1183 client_authenticated_sender = string_copy(local_authenticated_sender);
1184 }
1185 else
1186 *buffer= 0;
1187
1188 return FALSE;
1189 }
1190
1191
1192
1193 #ifdef EXPERIMENTAL_DANE
1194 /* Lookup TLSA record for host/port.
1195 Return: OK success with dnssec; DANE mode
1196 DEFER Do not use this host now, may retry later
1197 FAIL_FORCED No TLSA record; DANE not usable
1198 FAIL Do not use this connection
1199 */
1200
1201 int
1202 tlsa_lookup(const host_item * host, dns_answer * dnsa, BOOL dane_required)
1203 {
1204 /* move this out to host.c given the similarity to dns_lookup() ? */
1205 uschar buffer[300];
1206 const uschar * fullname = buffer;
1207 int rc;
1208 BOOL sec;
1209
1210 /* TLSA lookup string */
1211 (void)sprintf(CS buffer, "_%d._tcp.%.256s", host->port, host->name);
1212
1213 rc = dns_lookup(dnsa, buffer, T_TLSA, &fullname);
1214 sec = dns_is_secure(dnsa);
1215 DEBUG(D_transport)
1216 debug_printf("TLSA lookup ret %d %sDNSSEC\n", rc, sec ? "" : "not ");
1217
1218 switch (rc)
1219 {
1220 case DNS_SUCCEED:
1221 if (sec) return OK;
1222
1223 log_write(0, LOG_MAIN, "DANE error: TLSA lookup not DNSSEC");
1224 /*FALLTHROUGH*/
1225 case DNS_AGAIN:
1226 return DEFER; /* just defer this TLS'd conn */
1227
1228 case DNS_NODATA: /* no TLSA RR for this lookup */
1229 case DNS_NOMATCH: /* no records at all for this lookup */
1230 return dane_required ? FAIL : FAIL_FORCED;
1231
1232 default:
1233 case DNS_FAIL:
1234 return dane_required ? FAIL : DEFER;
1235 }
1236 }
1237 #endif
1238
1239
1240
1241 typedef struct smtp_compare_s
1242 {
1243 uschar *current_sender_address;
1244 struct transport_instance *tblock;
1245 } smtp_compare_t;
1246
1247
1248 /* Create a unique string that identifies this message, it is based on
1249 sender_address, helo_data and tls_certificate if enabled.
1250 */
1251
1252 static uschar *
1253 smtp_local_identity(uschar * sender, struct transport_instance * tblock)
1254 {
1255 address_item * addr1;
1256 uschar * if1 = US"";
1257 uschar * helo1 = US"";
1258 #ifdef SUPPORT_TLS
1259 uschar * tlsc1 = US"";
1260 #endif
1261 uschar * save_sender_address = sender_address;
1262 uschar * local_identity = NULL;
1263 smtp_transport_options_block * ob =
1264 (smtp_transport_options_block *)tblock->options_block;
1265
1266 sender_address = sender;
1267
1268 addr1 = deliver_make_addr (sender, TRUE);
1269 deliver_set_expansions(addr1);
1270
1271 if (ob->interface)
1272 if1 = expand_string(ob->interface);
1273
1274 if (ob->helo_data)
1275 helo1 = expand_string(ob->helo_data);
1276
1277 #ifdef SUPPORT_TLS
1278 if (ob->tls_certificate)
1279 tlsc1 = expand_string(ob->tls_certificate);
1280 local_identity = string_sprintf ("%s^%s^%s", if1, helo1, tlsc1);
1281 #else
1282 local_identity = string_sprintf ("%s^%s", if1, helo1);
1283 #endif
1284
1285 deliver_set_expansions(NULL);
1286 sender_address = save_sender_address;
1287
1288 return local_identity;
1289 }
1290
1291
1292
1293 /* This routine is a callback that is called from transport_check_waiting.
1294 This function will evaluate the incoming message versus the previous
1295 message. If the incoming message is using a different local identity then
1296 we will veto this new message. */
1297
1298 static BOOL
1299 smtp_are_same_identities(uschar * message_id, smtp_compare_t * s_compare)
1300 {
1301 uschar * message_local_identity,
1302 * current_local_identity,
1303 * new_sender_address;
1304
1305 current_local_identity =
1306 smtp_local_identity(s_compare->current_sender_address, s_compare->tblock);
1307
1308 if (!(new_sender_address = deliver_get_sender_address(message_id)))
1309 return 0;
1310
1311 message_local_identity =
1312 smtp_local_identity(new_sender_address, s_compare->tblock);
1313
1314 return Ustrcmp(current_local_identity, message_local_identity) == 0;
1315 }
1316
1317
1318
1319 static uschar
1320 ehlo_response(uschar * buf, uschar checks)
1321 {
1322 size_t bsize = Ustrlen(buf);
1323
1324 #ifdef SUPPORT_TLS
1325 if ( checks & OPTION_TLS
1326 && pcre_exec(regex_STARTTLS, NULL, CS buf, bsize, 0, PCRE_EOPT, NULL, 0) < 0)
1327 checks &= ~OPTION_TLS;
1328 #endif
1329
1330 if ( checks & OPTION_IGNQ
1331 && pcre_exec(regex_IGNOREQUOTA, NULL, CS buf, bsize, 0,
1332 PCRE_EOPT, NULL, 0) < 0)
1333 checks &= ~OPTION_IGNQ;
1334
1335 if ( checks & OPTION_CHUNKING
1336 && pcre_exec(regex_CHUNKING, NULL, CS buf, bsize, 0, PCRE_EOPT, NULL, 0) < 0)
1337 checks &= ~OPTION_CHUNKING;
1338
1339 #ifndef DISABLE_PRDR
1340 if ( checks & OPTION_PRDR
1341 && pcre_exec(regex_PRDR, NULL, CS buf, bsize, 0, PCRE_EOPT, NULL, 0) < 0)
1342 checks &= ~OPTION_PRDR;
1343 #endif
1344
1345 #ifdef SUPPORT_I18N
1346 if ( checks & OPTION_UTF8
1347 && pcre_exec(regex_UTF8, NULL, CS buf, bsize, 0, PCRE_EOPT, NULL, 0) < 0)
1348 checks &= ~OPTION_UTF8;
1349 #endif
1350
1351 if ( checks & OPTION_DSN
1352 && pcre_exec(regex_DSN, NULL, CS buf, bsize, 0, PCRE_EOPT, NULL, 0) < 0)
1353 checks &= ~OPTION_DSN;
1354
1355 if ( checks & OPTION_PIPE
1356 && pcre_exec(regex_PIPELINING, NULL, CS buf, bsize, 0,
1357 PCRE_EOPT, NULL, 0) < 0)
1358 checks &= ~OPTION_PIPE;
1359
1360 if ( checks & OPTION_SIZE
1361 && pcre_exec(regex_SIZE, NULL, CS buf, bsize, 0, PCRE_EOPT, NULL, 0) < 0)
1362 checks &= ~OPTION_SIZE;
1363
1364 return checks;
1365 }
1366
1367
1368
1369 /* Callback for emitting a BDAT data chunk header.
1370
1371 If given a nonzero size, first flush any buffered SMTP commands
1372 then emit the command.
1373
1374 Reap previous SMTP command responses if requested, and always reap
1375 the response from a previous BDAT command.
1376
1377 Args:
1378 tctx transport context
1379 chunk_size value for SMTP BDAT command
1380 flags
1381 tc_chunk_last add LAST option to SMTP BDAT command
1382 tc_reap_prev reap response to previous SMTP commands
1383
1384 Returns: OK or ERROR
1385 */
1386
1387 static int
1388 smtp_chunk_cmd_callback(transport_ctx * tctx, unsigned chunk_size,
1389 unsigned flags)
1390 {
1391 smtp_transport_options_block * ob =
1392 (smtp_transport_options_block *)(tctx->tblock->options_block);
1393 smtp_context * sx = tctx->smtp_context;
1394 int cmd_count = 0;
1395 int prev_cmd_count;
1396
1397 /* Write SMTP chunk header command. If not reaping responses, note that
1398 there may be more writes (like, the chunk data) done soon. */
1399
1400 if (chunk_size > 0)
1401 {
1402 if((cmd_count = smtp_write_command(&sx->outblock,
1403 flags & tc_reap_prev ? SCMD_FLUSH : SCMD_MORE,
1404 "BDAT %u%s\r\n", chunk_size, flags & tc_chunk_last ? " LAST" : "")
1405 ) < 0) return ERROR;
1406 if (flags & tc_chunk_last)
1407 data_command = string_copy(big_buffer); /* Save for later error message */
1408 }
1409
1410 prev_cmd_count = cmd_count += sx->cmd_count;
1411
1412 /* Reap responses for any previous, but not one we just emitted */
1413
1414 if (chunk_size > 0)
1415 prev_cmd_count--;
1416 if (sx->pending_BDAT)
1417 prev_cmd_count--;
1418
1419 if (flags & tc_reap_prev && prev_cmd_count > 0)
1420 {
1421 DEBUG(D_transport) debug_printf("look for %d responses"
1422 " for previous pipelined cmds\n", prev_cmd_count);
1423
1424 switch(sync_responses(sx, prev_cmd_count, 0))
1425 {
1426 case 1: /* 2xx (only) => OK */
1427 case 3: sx->good_RCPT = TRUE; /* 2xx & 5xx => OK & progress made */
1428 case 2: sx->completed_addr = TRUE; /* 5xx (only) => progress made */
1429 case 0: break; /* No 2xx or 5xx, but no probs */
1430
1431 case -1: /* Timeout on RCPT */
1432 default: return ERROR; /* I/O error, or any MAIL/DATA error */
1433 }
1434 cmd_count = 1;
1435 if (!sx->pending_BDAT)
1436 pipelining_active = FALSE;
1437 }
1438
1439 /* Reap response for an outstanding BDAT */
1440
1441 if (sx->pending_BDAT)
1442 {
1443 DEBUG(D_transport) debug_printf("look for one response for BDAT\n");
1444
1445 if (!smtp_read_response(&sx->inblock, sx->buffer, sizeof(sx->buffer), '2',
1446 ob->command_timeout))
1447 {
1448 if (errno == 0 && sx->buffer[0] == '4')
1449 {
1450 errno = ERRNO_DATA4XX; /*XXX does this actually get used? */
1451 sx->addrlist->more_errno |=
1452 ((sx->buffer[1] - '0')*10 + sx->buffer[2] - '0') << 8;
1453 }
1454 return ERROR;
1455 }
1456 cmd_count--;
1457 sx->pending_BDAT = FALSE;
1458 pipelining_active = FALSE;
1459 }
1460 else if (chunk_size > 0)
1461 sx->pending_BDAT = TRUE;
1462
1463
1464 sx->cmd_count = cmd_count;
1465 return OK;
1466 }
1467
1468
1469
1470 /*************************************************
1471 * Make connection for given message *
1472 *************************************************/
1473
1474 /*
1475 Arguments:
1476 ctx connection context
1477 suppress_tls if TRUE, don't attempt a TLS connection - this is set for
1478 a second attempt after TLS initialization fails
1479
1480 Returns: OK - the connection was made and the delivery attempted;
1481 fd is set in the conn context, tls_out set up.
1482 DEFER - the connection could not be made, or something failed
1483 while setting up the SMTP session, or there was a
1484 non-message-specific error, such as a timeout.
1485 ERROR - helo_data or add_headers or authenticated_sender is
1486 specified for this transport, and the string failed
1487 to expand
1488 */
1489 int
1490 smtp_setup_conn(smtp_context * sx, BOOL suppress_tls)
1491 {
1492 #if defined(SUPPORT_TLS) && defined(EXPERIMENTAL_DANE)
1493 dns_answer tlsa_dnsa;
1494 #endif
1495 BOOL pass_message = FALSE;
1496 uschar * message = NULL;
1497 int yield = OK;
1498 int rc;
1499
1500 sx->ob = (smtp_transport_options_block *) sx->tblock->options_block;
1501
1502 sx->lmtp = strcmpic(sx->ob->protocol, US"lmtp") == 0;
1503 sx->smtps = strcmpic(sx->ob->protocol, US"smtps") == 0;
1504 sx->ok = FALSE;
1505 sx->send_rset = TRUE;
1506 sx->send_quit = TRUE;
1507 sx->setting_up = TRUE;
1508 sx->esmtp = TRUE;
1509 sx->esmtp_sent = FALSE;
1510 #ifdef SUPPORT_I18N
1511 sx->utf8_needed = FALSE;
1512 #endif
1513 sx->dsn_all_lasthop = TRUE;
1514 #if defined(SUPPORT_TLS) && defined(EXPERIMENTAL_DANE)
1515 sx->dane = FALSE;
1516 sx->dane_required = verify_check_given_host(&sx->ob->hosts_require_dane, sx->host) == OK;
1517 #endif
1518
1519 if ((sx->max_rcpt = sx->tblock->max_addresses) == 0) sx->max_rcpt = 999999;
1520 sx->peer_offered = 0;
1521 sx->avoid_option = 0;
1522 sx->igquotstr = US"";
1523 if (!sx->helo_data) sx->helo_data = sx->ob->helo_data;
1524 #ifdef EXPERIMENTAL_DSN_INFO
1525 sx->smtp_greeting = NULL;
1526 sx->helo_response = NULL;
1527 #endif
1528
1529 smtp_command = US"initial connection";
1530 sx->buffer[0] = '\0';
1531
1532 /* Set up the buffer for reading SMTP response packets. */
1533
1534 sx->inblock.buffer = sx->inbuffer;
1535 sx->inblock.buffersize = sizeof(sx->inbuffer);
1536 sx->inblock.ptr = sx->inbuffer;
1537 sx->inblock.ptrend = sx->inbuffer;
1538
1539 /* Set up the buffer for holding SMTP commands while pipelining */
1540
1541 sx->outblock.buffer = sx->outbuffer;
1542 sx->outblock.buffersize = sizeof(sx->outbuffer);
1543 sx->outblock.ptr = sx->outbuffer;
1544 sx->outblock.cmd_count = 0;
1545 sx->outblock.authenticating = FALSE;
1546
1547 /* Reset the parameters of a TLS session. */
1548
1549 tls_out.bits = 0;
1550 tls_out.cipher = NULL; /* the one we may use for this transport */
1551 tls_out.ourcert = NULL;
1552 tls_out.peercert = NULL;
1553 tls_out.peerdn = NULL;
1554 #if defined(SUPPORT_TLS) && !defined(USE_GNUTLS)
1555 tls_out.sni = NULL;
1556 #endif
1557 tls_out.ocsp = OCSP_NOT_REQ;
1558
1559 /* Flip the legacy TLS-related variables over to the outbound set in case
1560 they're used in the context of the transport. Don't bother resetting
1561 afterward (when being used by a transport) as we're in a subprocess.
1562 For verify, unflipped once the callout is dealt with */
1563
1564 tls_modify_variables(&tls_out);
1565
1566 #ifndef SUPPORT_TLS
1567 if (sx->smtps)
1568 {
1569 set_errno_nohost(sx->addrlist, ERRNO_TLSFAILURE, US"TLS support not available",
1570 DEFER, FALSE);
1571 return ERROR;
1572 }
1573 #endif
1574
1575 /* Make a connection to the host if this isn't a continued delivery, and handle
1576 the initial interaction and HELO/EHLO/LHLO. Connect timeout errors are handled
1577 specially so they can be identified for retries. */
1578
1579 if (!continue_hostname)
1580 {
1581 if (sx->verify)
1582 HDEBUG(D_verify) debug_printf("interface=%s port=%d\n", sx->interface, sx->port);
1583
1584 /* Get the actual port the connection will use, into sx->host */
1585
1586 smtp_port_for_connect(sx->host, sx->port);
1587
1588 #if defined(SUPPORT_TLS) && defined(EXPERIMENTAL_DANE)
1589 /* Do TLSA lookup for DANE */
1590 {
1591 tls_out.dane_verified = FALSE;
1592 tls_out.tlsa_usage = 0;
1593
1594 if (sx->host->dnssec == DS_YES)
1595 {
1596 if( sx->dane_required
1597 || verify_check_given_host(&sx->ob->hosts_try_dane, sx->host) == OK
1598 )
1599 switch (rc = tlsa_lookup(sx->host, &tlsa_dnsa, sx->dane_required))
1600 {
1601 case OK: sx->dane = TRUE;
1602 sx->ob->tls_tempfail_tryclear = FALSE;
1603 break;
1604 case FAIL_FORCED: break;
1605 default: set_errno_nohost(sx->addrlist, ERRNO_DNSDEFER,
1606 string_sprintf("DANE error: tlsa lookup %s",
1607 rc == DEFER ? "DEFER" : "FAIL"),
1608 rc, FALSE);
1609 return rc;
1610 }
1611 }
1612 else if (sx->dane_required)
1613 {
1614 set_errno_nohost(sx->addrlist, ERRNO_DNSDEFER,
1615 string_sprintf("DANE error: %s lookup not DNSSEC", sx->host->name),
1616 FAIL, FALSE);
1617 return FAIL;
1618 }
1619 }
1620 #endif /*DANE*/
1621
1622 /* Make the TCP connection */
1623
1624 sx->inblock.sock = sx->outblock.sock =
1625 smtp_connect(sx->host, sx->host_af, sx->interface,
1626 sx->ob->connect_timeout, sx->tblock);
1627
1628 if (sx->inblock.sock < 0)
1629 {
1630 uschar * msg = NULL;
1631 if (sx->verify)
1632 {
1633 msg = US strerror(errno);
1634 HDEBUG(D_verify) debug_printf("connect: %s\n", msg);
1635 }
1636 set_errno_nohost(sx->addrlist,
1637 errno == ETIMEDOUT ? ERRNO_CONNECTTIMEOUT : errno,
1638 sx->verify ? string_sprintf("could not connect: %s", msg)
1639 : NULL,
1640 DEFER, FALSE);
1641 sx->send_quit = FALSE;
1642 return DEFER;
1643 }
1644
1645 /* Expand the greeting message while waiting for the initial response. (Makes
1646 sense if helo_data contains ${lookup dnsdb ...} stuff). The expansion is
1647 delayed till here so that $sending_interface and $sending_port are set. */
1648
1649 if (sx->helo_data)
1650 if (!(sx->helo_data = expand_string(sx->helo_data)))
1651 if (sx->verify)
1652 log_write(0, LOG_MAIN|LOG_PANIC,
1653 "<%s>: failed to expand transport's helo_data value for callout: %s",
1654 sx->addrlist->address, expand_string_message);
1655
1656 #ifdef SUPPORT_I18N
1657 if (sx->helo_data)
1658 {
1659 expand_string_message = NULL;
1660 if ((sx->helo_data = string_domain_utf8_to_alabel(sx->helo_data,
1661 &expand_string_message)),
1662 expand_string_message)
1663 if (sx->verify)
1664 log_write(0, LOG_MAIN|LOG_PANIC,
1665 "<%s>: failed to expand transport's helo_data value for callout: %s",
1666 sx->addrlist->address, expand_string_message);
1667 else
1668 sx->helo_data = NULL;
1669 }
1670 #endif
1671
1672 /* The first thing is to wait for an initial OK response. The dreaded "goto"
1673 is nevertheless a reasonably clean way of programming this kind of logic,
1674 where you want to escape on any error. */
1675
1676 if (!sx->smtps)
1677 {
1678 BOOL good_response;
1679
1680 #ifdef TCP_QUICKACK
1681 (void) setsockopt(sx->inblock.sock, IPPROTO_TCP, TCP_QUICKACK, US &off, sizeof(off));
1682 #endif
1683 good_response = smtp_read_response(&sx->inblock, sx->buffer, sizeof(sx->buffer),
1684 '2', sx->ob->command_timeout);
1685 #ifdef EXPERIMENTAL_DSN_INFO
1686 sx->smtp_greeting = string_copy(sx->buffer);
1687 #endif
1688 if (!good_response) goto RESPONSE_FAILED;
1689
1690 #ifndef DISABLE_EVENT
1691 {
1692 uschar * s;
1693 lookup_dnssec_authenticated = sx->host->dnssec==DS_YES ? US"yes"
1694 : sx->host->dnssec==DS_NO ? US"no" : NULL;
1695 s = event_raise(sx->tblock->event_action, US"smtp:connect", sx->buffer);
1696 if (s)
1697 {
1698 set_errno_nohost(sx->addrlist, ERRNO_EXPANDFAIL,
1699 string_sprintf("deferred by smtp:connect event expansion: %s", s),
1700 DEFER, FALSE);
1701 yield = DEFER;
1702 goto SEND_QUIT;
1703 }
1704 }
1705 #endif
1706
1707 /* Now check if the helo_data expansion went well, and sign off cleanly if
1708 it didn't. */
1709
1710 if (!sx->helo_data)
1711 {
1712 message = string_sprintf("failed to expand helo_data: %s",
1713 expand_string_message);
1714 set_errno_nohost(sx->addrlist, ERRNO_EXPANDFAIL, message, DEFER, FALSE);
1715 yield = DEFER;
1716 goto SEND_QUIT;
1717 }
1718 }
1719
1720 /** Debugging without sending a message
1721 sx->addrlist->transport_return = DEFER;
1722 goto SEND_QUIT;
1723 **/
1724
1725 /* Errors that occur after this point follow an SMTP command, which is
1726 left in big_buffer by smtp_write_command() for use in error messages. */
1727
1728 smtp_command = big_buffer;
1729
1730 /* Tell the remote who we are...
1731
1732 February 1998: A convention has evolved that ESMTP-speaking MTAs include the
1733 string "ESMTP" in their greeting lines, so make Exim send EHLO if the
1734 greeting is of this form. The assumption was that the far end supports it
1735 properly... but experience shows that there are some that give 5xx responses,
1736 even though the banner includes "ESMTP" (there's a bloody-minded one that
1737 says "ESMTP not spoken here"). Cope with that case.
1738
1739 September 2000: Time has passed, and it seems reasonable now to always send
1740 EHLO at the start. It is also convenient to make the change while installing
1741 the TLS stuff.
1742
1743 July 2003: Joachim Wieland met a broken server that advertises "PIPELINING"
1744 but times out after sending MAIL FROM, RCPT TO and DATA all together. There
1745 would be no way to send out the mails, so there is now a host list
1746 "hosts_avoid_esmtp" that disables ESMTP for special hosts and solves the
1747 PIPELINING problem as well. Maybe it can also be useful to cure other
1748 problems with broken servers.
1749
1750 Exim originally sent "Helo" at this point and ran for nearly a year that way.
1751 Then somebody tried it with a Microsoft mailer... It seems that all other
1752 mailers use upper case for some reason (the RFC is quite clear about case
1753 independence) so, for peace of mind, I gave in. */
1754
1755 sx->esmtp = verify_check_given_host(&sx->ob->hosts_avoid_esmtp, sx->host) != OK;
1756
1757 /* Alas; be careful, since this goto is not an error-out, so conceivably
1758 we might set data between here and the target which we assume to exist
1759 and be usable. I can see this coming back to bite us. */
1760 #ifdef SUPPORT_TLS
1761 if (sx->smtps)
1762 {
1763 smtp_peer_options |= OPTION_TLS;
1764 suppress_tls = FALSE;
1765 sx->ob->tls_tempfail_tryclear = FALSE;
1766 smtp_command = US"SSL-on-connect";
1767 goto TLS_NEGOTIATE;
1768 }
1769 #endif
1770
1771 if (sx->esmtp)
1772 {
1773 if (smtp_write_command(&sx->outblock, SCMD_FLUSH, "%s %s\r\n",
1774 sx->lmtp ? "LHLO" : "EHLO", sx->helo_data) < 0)
1775 goto SEND_FAILED;
1776 sx->esmtp_sent = TRUE;
1777 if (!smtp_read_response(&sx->inblock, sx->buffer, sizeof(sx->buffer), '2',
1778 sx->ob->command_timeout))
1779 {
1780 if (errno != 0 || sx->buffer[0] == 0 || sx->lmtp)
1781 {
1782 #ifdef EXPERIMENTAL_DSN_INFO
1783 sx->helo_response = string_copy(sx->buffer);
1784 #endif
1785 goto RESPONSE_FAILED;
1786 }
1787 sx->esmtp = FALSE;
1788 }
1789 #ifdef EXPERIMENTAL_DSN_INFO
1790 sx->helo_response = string_copy(sx->buffer);
1791 #endif
1792 }
1793 else
1794 DEBUG(D_transport)
1795 debug_printf("not sending EHLO (host matches hosts_avoid_esmtp)\n");
1796
1797 if (!sx->esmtp)
1798 {
1799 BOOL good_response;
1800 int n = sizeof(sx->buffer);
1801 uschar * rsp = sx->buffer;
1802
1803 if (sx->esmtp_sent && (n = Ustrlen(sx->buffer)) < sizeof(sx->buffer)/2)
1804 { rsp = sx->buffer + n + 1; n = sizeof(sx->buffer) - n; }
1805
1806 if (smtp_write_command(&sx->outblock, SCMD_FLUSH, "HELO %s\r\n", sx->helo_data) < 0)
1807 goto SEND_FAILED;
1808 good_response = smtp_read_response(&sx->inblock, rsp, n,
1809 '2', sx->ob->command_timeout);
1810 #ifdef EXPERIMENTAL_DSN_INFO
1811 sx->helo_response = string_copy(rsp);
1812 #endif
1813 if (!good_response)
1814 {
1815 /* Handle special logging for a closed connection after HELO
1816 when had previously sent EHLO */
1817
1818 if (rsp != sx->buffer && rsp[0] == 0 && (errno == 0 || errno == ECONNRESET))
1819 {
1820 errno = ERRNO_SMTPCLOSED;
1821 goto EHLOHELO_FAILED;
1822 }
1823 Ustrncpy(sx->buffer, rsp, sizeof(sx->buffer)/2);
1824 goto RESPONSE_FAILED;
1825 }
1826 }
1827
1828 sx->avoid_option = sx->peer_offered = smtp_peer_options = 0;
1829
1830 if (sx->esmtp || sx->lmtp)
1831 {
1832 sx->peer_offered = ehlo_response(sx->buffer,
1833 OPTION_TLS /* others checked later */
1834 );
1835
1836 /* Set tls_offered if the response to EHLO specifies support for STARTTLS. */
1837
1838 #ifdef SUPPORT_TLS
1839 smtp_peer_options |= sx->peer_offered & OPTION_TLS;
1840 #endif
1841 }
1842 }
1843
1844 /* For continuing deliveries down the same channel, having re-exec'd the socket
1845 is the standard input; for a socket held open from verify it is recorded
1846 in the cutthrough context block. Either way we don't need to redo EHLO here
1847 (but may need to do so for TLS - see below).
1848 Set up the pointer to where subsequent commands will be left, for
1849 error messages. Note that smtp_peer_options will have been
1850 set from the command line if they were set in the process that passed the
1851 connection on. */
1852
1853 /*XXX continue case needs to propagate DSN_INFO, prob. in deliver.c
1854 as the continue goes via transport_pass_socket() and doublefork and exec.
1855 It does not wait. Unclear how we keep separate host's responses
1856 separate - we could match up by host ip+port as a bodge. */
1857
1858 else
1859 {
1860 if (cutthrough.fd >= 0 && cutthrough.callout_hold_only)
1861 {
1862 sx->inblock.sock = sx->outblock.sock = cutthrough.fd;
1863 sx->host->port = sx->port = cutthrough.host.port;
1864 }
1865 else
1866 {
1867 sx->inblock.sock = sx->outblock.sock = 0; /* stdin */
1868 smtp_port_for_connect(sx->host, sx->port); /* Record the port that was used */
1869 }
1870 smtp_command = big_buffer;
1871 sx->helo_data = NULL; /* ensure we re-expand ob->helo_data */
1872
1873 /* For a continued connection with TLS being proxied for us, or a
1874 held-open verify connection with TLS, nothing more to do. */
1875
1876 if ( continue_proxy_cipher
1877 || (cutthrough.fd >= 0 && cutthrough.callout_hold_only && cutthrough.is_tls)
1878 )
1879 {
1880 sx->peer_offered = smtp_peer_options;
1881 pipelining_active = !!(smtp_peer_options & OPTION_PIPE);
1882 HDEBUG(D_transport) debug_printf("continued connection, %s TLS\n",
1883 continue_proxy_cipher ? "proxied" : "verify conn with");
1884 return OK;
1885 }
1886 HDEBUG(D_transport) debug_printf("continued connection, no TLS\n");
1887 }
1888
1889 /* If TLS is available on this connection, whether continued or not, attempt to
1890 start up a TLS session, unless the host is in hosts_avoid_tls. If successful,
1891 send another EHLO - the server may give a different answer in secure mode. We
1892 use a separate buffer for reading the response to STARTTLS so that if it is
1893 negative, the original EHLO data is available for subsequent analysis, should
1894 the client not be required to use TLS. If the response is bad, copy the buffer
1895 for error analysis. */
1896
1897 #ifdef SUPPORT_TLS
1898 if ( smtp_peer_options & OPTION_TLS
1899 && !suppress_tls
1900 && verify_check_given_host(&sx->ob->hosts_avoid_tls, sx->host) != OK
1901 && ( !sx->verify
1902 || verify_check_given_host(&sx->ob->hosts_verify_avoid_tls, sx->host) != OK
1903 ) )
1904 {
1905 uschar buffer2[4096];
1906 if (smtp_write_command(&sx->outblock, SCMD_FLUSH, "STARTTLS\r\n") < 0)
1907 goto SEND_FAILED;
1908
1909 /* If there is an I/O error, transmission of this message is deferred. If
1910 there is a temporary rejection of STARRTLS and tls_tempfail_tryclear is
1911 false, we also defer. However, if there is a temporary rejection of STARTTLS
1912 and tls_tempfail_tryclear is true, or if there is an outright rejection of
1913 STARTTLS, we carry on. This means we will try to send the message in clear,
1914 unless the host is in hosts_require_tls (tested below). */
1915
1916 if (!smtp_read_response(&sx->inblock, buffer2, sizeof(buffer2), '2',
1917 sx->ob->command_timeout))
1918 {
1919 if ( errno != 0
1920 || buffer2[0] == 0
1921 || (buffer2[0] == '4' && !sx->ob->tls_tempfail_tryclear)
1922 )
1923 {
1924 Ustrncpy(sx->buffer, buffer2, sizeof(sx->buffer));
1925 sx->buffer[sizeof(sx->buffer)-1] = '\0';
1926 goto RESPONSE_FAILED;
1927 }
1928 }
1929
1930 /* STARTTLS accepted: try to negotiate a TLS session. */
1931
1932 else
1933 TLS_NEGOTIATE:
1934 {
1935 address_item * addr;
1936 uschar * errstr;
1937 int rc = tls_client_start(sx->inblock.sock, sx->host, sx->addrlist, sx->tblock,
1938 # ifdef EXPERIMENTAL_DANE
1939 sx->dane ? &tlsa_dnsa : NULL,
1940 # endif
1941 &errstr);
1942
1943 /* TLS negotiation failed; give an error. From outside, this function may
1944 be called again to try in clear on a new connection, if the options permit
1945 it for this host. */
1946
1947 if (rc != OK)
1948 {
1949 # ifdef EXPERIMENTAL_DANE
1950 if (sx->dane) log_write(0, LOG_MAIN,
1951 "DANE attempt failed; TLS connection to %s [%s]: %s",
1952 sx->host->name, sx->host->address, errstr);
1953 # endif
1954
1955 errno = ERRNO_TLSFAILURE;
1956 message = string_sprintf("TLS session: %s", errstr);
1957 sx->send_quit = FALSE;
1958 goto TLS_FAILED;
1959 }
1960
1961 /* TLS session is set up */
1962
1963 smtp_peer_options_wrap = smtp_peer_options;
1964 for (addr = sx->addrlist; addr; addr = addr->next)
1965 if (addr->transport_return == PENDING_DEFER)
1966 {
1967 addr->cipher = tls_out.cipher;
1968 addr->ourcert = tls_out.ourcert;
1969 addr->peercert = tls_out.peercert;
1970 addr->peerdn = tls_out.peerdn;
1971 addr->ocsp = tls_out.ocsp;
1972 }
1973 }
1974 }
1975
1976 /* if smtps, we'll have smtp_command set to something else; always safe to
1977 reset it here. */
1978 smtp_command = big_buffer;
1979
1980 /* If we started TLS, redo the EHLO/LHLO exchange over the secure channel. If
1981 helo_data is null, we are dealing with a connection that was passed from
1982 another process, and so we won't have expanded helo_data above. We have to
1983 expand it here. $sending_ip_address and $sending_port are set up right at the
1984 start of the Exim process (in exim.c). */
1985
1986 if (tls_out.active >= 0)
1987 {
1988 char *greeting_cmd;
1989 BOOL good_response;
1990
1991 if (!sx->helo_data && !(sx->helo_data = expand_string(sx->ob->helo_data)))
1992 {
1993 uschar *message = string_sprintf("failed to expand helo_data: %s",
1994 expand_string_message);
1995 set_errno_nohost(sx->addrlist, ERRNO_EXPANDFAIL, message, DEFER, FALSE);
1996 yield = DEFER;
1997 goto SEND_QUIT;
1998 }
1999
2000 /* For SMTPS we need to wait for the initial OK response. */
2001 if (sx->smtps)
2002 {
2003 good_response = smtp_read_response(&sx->inblock, sx->buffer, sizeof(sx->buffer),
2004 '2', sx->ob->command_timeout);
2005 #ifdef EXPERIMENTAL_DSN_INFO
2006 sx->smtp_greeting = string_copy(sx->buffer);
2007 #endif
2008 if (!good_response) goto RESPONSE_FAILED;
2009 }
2010
2011 if (sx->esmtp)
2012 greeting_cmd = "EHLO";
2013 else
2014 {
2015 greeting_cmd = "HELO";
2016 DEBUG(D_transport)
2017 debug_printf("not sending EHLO (host matches hosts_avoid_esmtp)\n");
2018 }
2019
2020 if (smtp_write_command(&sx->outblock, SCMD_FLUSH, "%s %s\r\n",
2021 sx->lmtp ? "LHLO" : greeting_cmd, sx->helo_data) < 0)
2022 goto SEND_FAILED;
2023 good_response = smtp_read_response(&sx->inblock, sx->buffer, sizeof(sx->buffer),
2024 '2', sx->ob->command_timeout);
2025 #ifdef EXPERIMENTAL_DSN_INFO
2026 sx->helo_response = string_copy(sx->buffer);
2027 #endif
2028 if (!good_response) goto RESPONSE_FAILED;
2029 smtp_peer_options = 0;
2030 }
2031
2032 /* If the host is required to use a secure channel, ensure that we
2033 have one. */
2034
2035 else if ( sx->smtps
2036 # ifdef EXPERIMENTAL_DANE
2037 || sx->dane
2038 # endif
2039 || verify_check_given_host(&sx->ob->hosts_require_tls, sx->host) == OK
2040 )
2041 {
2042 errno = ERRNO_TLSREQUIRED;
2043 message = string_sprintf("a TLS session is required, but %s",
2044 smtp_peer_options & OPTION_TLS
2045 ? "an attempt to start TLS failed" : "the server did not offer TLS support");
2046 goto TLS_FAILED;
2047 }
2048 #endif /*SUPPORT_TLS*/
2049
2050 /* If TLS is active, we have just started it up and re-done the EHLO command,
2051 so its response needs to be analyzed. If TLS is not active and this is a
2052 continued session down a previously-used socket, we haven't just done EHLO, so
2053 we skip this. */
2054
2055 if (continue_hostname == NULL
2056 #ifdef SUPPORT_TLS
2057 || tls_out.active >= 0
2058 #endif
2059 )
2060 {
2061 if (sx->esmtp || sx->lmtp)
2062 {
2063 sx->peer_offered = ehlo_response(sx->buffer,
2064 0 /* no TLS */
2065 | (sx->lmtp && sx->ob->lmtp_ignore_quota ? OPTION_IGNQ : 0)
2066 | OPTION_CHUNKING
2067 | OPTION_PRDR
2068 #ifdef SUPPORT_I18N
2069 | (sx->addrlist->prop.utf8_msg ? OPTION_UTF8 : 0)
2070 /*XXX if we hand peercaps on to continued-conn processes,
2071 must not depend on this addr */
2072 #endif
2073 | OPTION_DSN
2074 | OPTION_PIPE
2075 | (sx->ob->size_addition >= 0 ? OPTION_SIZE : 0)
2076 );
2077
2078 /* Set for IGNOREQUOTA if the response to LHLO specifies support and the
2079 lmtp_ignore_quota option was set. */
2080
2081 sx->igquotstr = sx->peer_offered & OPTION_IGNQ ? US" IGNOREQUOTA" : US"";
2082
2083 /* If the response to EHLO specified support for the SIZE parameter, note
2084 this, provided size_addition is non-negative. */
2085
2086 smtp_peer_options |= sx->peer_offered & OPTION_SIZE;
2087
2088 /* Note whether the server supports PIPELINING. If hosts_avoid_esmtp matched
2089 the current host, esmtp will be false, so PIPELINING can never be used. If
2090 the current host matches hosts_avoid_pipelining, don't do it. */
2091
2092 if ( sx->peer_offered & OPTION_PIPE
2093 && verify_check_given_host(&sx->ob->hosts_avoid_pipelining, sx->host) != OK)
2094 smtp_peer_options |= OPTION_PIPE;
2095
2096 DEBUG(D_transport) debug_printf("%susing PIPELINING\n",
2097 smtp_peer_options & OPTION_PIPE ? "" : "not ");
2098
2099 if ( sx->peer_offered & OPTION_CHUNKING
2100 && verify_check_given_host(&sx->ob->hosts_try_chunking, sx->host) != OK)
2101 sx->peer_offered &= ~OPTION_CHUNKING;
2102
2103 if (sx->peer_offered & OPTION_CHUNKING)
2104 {DEBUG(D_transport) debug_printf("CHUNKING usable\n");}
2105
2106 #ifndef DISABLE_PRDR
2107 if ( sx->peer_offered & OPTION_PRDR
2108 && verify_check_given_host(&sx->ob->hosts_try_prdr, sx->host) != OK)
2109 sx->peer_offered &= ~OPTION_PRDR;
2110
2111 if (sx->peer_offered & OPTION_PRDR)
2112 {DEBUG(D_transport) debug_printf("PRDR usable\n");}
2113 #endif
2114
2115 /* Note if the server supports DSN */
2116 smtp_peer_options |= sx->peer_offered & OPTION_DSN;
2117 DEBUG(D_transport) debug_printf("%susing DSN\n",
2118 sx->peer_offered & OPTION_DSN ? "" : "not ");
2119
2120 /* Note if the response to EHLO specifies support for the AUTH extension.
2121 If it has, check that this host is one we want to authenticate to, and do
2122 the business. The host name and address must be available when the
2123 authenticator's client driver is running. */
2124
2125 switch (yield = smtp_auth(sx->buffer, sizeof(sx->buffer), sx->addrlist, sx->host,
2126 sx->ob, sx->esmtp, &sx->inblock, &sx->outblock))
2127 {
2128 default: goto SEND_QUIT;
2129 case OK: break;
2130 case FAIL_SEND: goto SEND_FAILED;
2131 case FAIL: goto RESPONSE_FAILED;
2132 }
2133 }
2134 }
2135 pipelining_active = !!(smtp_peer_options & OPTION_PIPE);
2136
2137 /* The setting up of the SMTP call is now complete. Any subsequent errors are
2138 message-specific. */
2139
2140 sx->setting_up = FALSE;
2141
2142 #ifdef SUPPORT_I18N
2143 if (sx->addrlist->prop.utf8_msg)
2144 {
2145 sx->utf8_needed = !sx->addrlist->prop.utf8_downcvt
2146 && !sx->addrlist->prop.utf8_downcvt_maybe;
2147 DEBUG(D_transport) if (!sx->utf8_needed)
2148 debug_printf("utf8: %s downconvert\n",
2149 sx->addrlist->prop.utf8_downcvt ? "mandatory" : "optional");
2150 }
2151
2152 /* If this is an international message we need the host to speak SMTPUTF8 */
2153 if (sx->utf8_needed && !(sx->peer_offered & OPTION_UTF8))
2154 {
2155 errno = ERRNO_UTF8_FWD;
2156 goto RESPONSE_FAILED;
2157 }
2158 #endif
2159
2160 return OK;
2161
2162
2163 {
2164 int code;
2165
2166 RESPONSE_FAILED:
2167 message = NULL;
2168 sx->send_quit = check_response(sx->host, &errno, sx->addrlist->more_errno,
2169 sx->buffer, &code, &message, &pass_message);
2170 goto FAILED;
2171
2172 SEND_FAILED:
2173 code = '4';
2174 message = US string_sprintf("send() to %s [%s] failed: %s",
2175 sx->host->name, sx->host->address, strerror(errno));
2176 sx->send_quit = FALSE;
2177 goto FAILED;
2178
2179 /* This label is jumped to directly when a TLS negotiation has failed,
2180 or was not done for a host for which it is required. Values will be set
2181 in message and errno, and setting_up will always be true. Treat as
2182 a temporary error. */
2183
2184 EHLOHELO_FAILED:
2185 code = '4';
2186 message = string_sprintf("Remote host closed connection in response to %s"
2187 " (EHLO response was: %s)", smtp_command, sx->buffer);
2188 sx->send_quit = FALSE;
2189 goto FAILED;
2190
2191 #ifdef SUPPORT_TLS
2192 TLS_FAILED:
2193 code = '4';
2194 goto FAILED;
2195 #endif
2196
2197 /* The failure happened while setting up the call; see if the failure was
2198 a 5xx response (this will either be on connection, or following HELO - a 5xx
2199 after EHLO causes it to try HELO). If so, and there are no more hosts to try,
2200 fail all addresses, as this host is never going to accept them. For other
2201 errors during setting up (timeouts or whatever), defer all addresses, and
2202 yield DEFER, so that the host is not tried again for a while.
2203
2204 XXX This peeking for another host feels like a layering violation. We want
2205 to note the host as unusable, but down here we shouldn't know if this was
2206 the last host to try for the addr(list). Perhaps the upper layer should be
2207 the one to do set_errno() ? The problem is that currently the addr is where
2208 errno etc. are stashed, but until we run out of hosts to try the errors are
2209 host-specific. Maybe we should enhance the host_item definition? */
2210
2211 FAILED:
2212 sx->ok = FALSE; /* For when reached by GOTO */
2213 set_errno(sx->addrlist, errno, message,
2214 sx->host->next
2215 ? DEFER
2216 : code == '5'
2217 #ifdef SUPPORT_I18N
2218 || errno == ERRNO_UTF8_FWD
2219 #endif
2220 ? FAIL : DEFER,
2221 pass_message, sx->host
2222 #ifdef EXPERIMENTAL_DSN_INFO
2223 , sx->smtp_greeting, sx->helo_response
2224 #endif
2225 );
2226 yield = DEFER;
2227 }
2228
2229
2230 SEND_QUIT:
2231
2232 if (sx->send_quit)
2233 (void)smtp_write_command(&sx->outblock, SCMD_FLUSH, "QUIT\r\n");
2234
2235 #ifdef SUPPORT_TLS
2236 tls_close(FALSE, TRUE);
2237 #endif
2238
2239 /* Close the socket, and return the appropriate value, first setting
2240 works because the NULL setting is passed back to the calling process, and
2241 remote_max_parallel is forced to 1 when delivering over an existing connection,
2242 */
2243
2244 HDEBUG(D_transport|D_acl|D_v) debug_printf_indent(" SMTP(close)>>\n");
2245 if (sx->send_quit)
2246 {
2247 shutdown(sx->outblock.sock, SHUT_WR);
2248 if (fcntl(sx->inblock.sock, F_SETFL, O_NONBLOCK) == 0)
2249 for (rc = 16; read(sx->inblock.sock, sx->inbuffer, sizeof(sx->inbuffer)) > 0 && rc > 0;)
2250 rc--; /* drain socket */
2251 sx->send_quit = FALSE;
2252 }
2253 (void)close(sx->inblock.sock);
2254 sx->inblock.sock = sx->outblock.sock = -1;
2255
2256 #ifndef DISABLE_EVENT
2257 (void) event_raise(sx->tblock->event_action, US"tcp:close", NULL);
2258 #endif
2259
2260 continue_transport = NULL;
2261 continue_hostname = NULL;
2262 return yield;
2263 }
2264
2265
2266
2267
2268 /* Create the string of options that will be appended to the MAIL FROM:
2269 in the connection context buffer */
2270
2271 static int
2272 build_mailcmd_options(smtp_context * sx, address_item * addrlist)
2273 {
2274 uschar * p = sx->buffer;
2275 address_item * addr;
2276 int address_count;
2277
2278 *p = 0;
2279
2280 /* If we know the receiving MTA supports the SIZE qualification, and we know it,
2281 send it, adding something to the message size to allow for imprecision
2282 and things that get added en route. Exim keeps the number of lines
2283 in a message, so we can give an accurate value for the original message, but we
2284 need some additional to handle added headers. (Double "." characters don't get
2285 included in the count.) */
2286
2287 if ( message_size > 0
2288 && sx->peer_offered & OPTION_SIZE && !(sx->avoid_option & OPTION_SIZE))
2289 {
2290 /*XXX problem here under spool_files_wireformat?
2291 Or just forget about lines? Or inflate by a fixed proportion? */
2292
2293 sprintf(CS p, " SIZE=%d", message_size+message_linecount+sx->ob->size_addition);
2294 while (*p) p++;
2295 }
2296
2297 #ifndef DISABLE_PRDR
2298 /* If it supports Per-Recipient Data Reponses, and we have omre than one recipient,
2299 request that */
2300
2301 sx->prdr_active = FALSE;
2302 if (sx->peer_offered & OPTION_PRDR)
2303 for (addr = addrlist; addr; addr = addr->next)
2304 if (addr->transport_return == PENDING_DEFER)
2305 {
2306 for (addr = addr->next; addr; addr = addr->next)
2307 if (addr->transport_return == PENDING_DEFER)
2308 { /* at least two recipients to send */
2309 sx->prdr_active = TRUE;
2310 sprintf(CS p, " PRDR"); p += 5;
2311 break;
2312 }
2313 break;
2314 }
2315 #endif
2316
2317 #ifdef SUPPORT_I18N
2318 /* If it supports internationalised messages, and this meesage need that,
2319 request it */
2320
2321 if ( sx->peer_offered & OPTION_UTF8
2322 && addrlist->prop.utf8_msg
2323 && !addrlist->prop.utf8_downcvt
2324 )
2325 Ustrcpy(p, " SMTPUTF8"), p += 9;
2326 #endif
2327
2328 /* check if all addresses have DSN-lasthop flag; do not send RET and ENVID if so */
2329 for (sx->dsn_all_lasthop = TRUE, addr = addrlist, address_count = 0;
2330 addr && address_count < sx->max_rcpt;
2331 addr = addr->next) if (addr->transport_return == PENDING_DEFER)
2332 {
2333 address_count++;
2334 if (!(addr->dsn_flags & rf_dsnlasthop))
2335 {
2336 sx->dsn_all_lasthop = FALSE;
2337 break;
2338 }
2339 }
2340
2341 /* Add any DSN flags to the mail command */
2342
2343 if (sx->peer_offered & OPTION_DSN && !sx->dsn_all_lasthop)
2344 {
2345 if (dsn_ret == dsn_ret_hdrs)
2346 { Ustrcpy(p, " RET=HDRS"); p += 9; }
2347 else if (dsn_ret == dsn_ret_full)
2348 { Ustrcpy(p, " RET=FULL"); p += 9; }
2349
2350 if (dsn_envid)
2351 {
2352 string_format(p, sizeof(sx->buffer) - (p-sx->buffer), " ENVID=%s", dsn_envid);
2353 while (*p) p++;
2354 }
2355 }
2356
2357 /* If an authenticated_sender override has been specified for this transport
2358 instance, expand it. If the expansion is forced to fail, and there was already
2359 an authenticated_sender for this message, the original value will be used.
2360 Other expansion failures are serious. An empty result is ignored, but there is
2361 otherwise no check - this feature is expected to be used with LMTP and other
2362 cases where non-standard addresses (e.g. without domains) might be required. */
2363
2364 if (smtp_mail_auth_str(p, sizeof(sx->buffer) - (p-sx->buffer), addrlist, sx->ob))
2365 return ERROR;
2366
2367 return OK;
2368 }
2369
2370
2371 static void
2372 build_rcptcmd_options(smtp_context * sx, const address_item * addr)
2373 {
2374 uschar * p = sx->buffer;
2375 *p = 0;
2376
2377 /* Add any DSN flags to the rcpt command */
2378
2379 if (sx->peer_offered & OPTION_DSN && !(addr->dsn_flags & rf_dsnlasthop))
2380 {
2381 if (addr->dsn_flags & rf_dsnflags)
2382 {
2383 int i;
2384 BOOL first = TRUE;
2385
2386 Ustrcpy(p, " NOTIFY=");
2387 while (*p) p++;
2388 for (i = 0; i < nelem(rf_list); i++) if (addr->dsn_flags & rf_list[i])
2389 {
2390 if (!first) *p++ = ',';
2391 first = FALSE;
2392 Ustrcpy(p, rf_names[i]);
2393 while (*p) p++;
2394 }
2395 }
2396
2397 if (addr->dsn_orcpt)
2398 {
2399 string_format(p, sizeof(sx->buffer) - (p-sx->buffer), " ORCPT=%s",
2400 addr->dsn_orcpt);
2401 while (*p) p++;
2402 }
2403 }
2404 }
2405
2406
2407
2408 /*
2409 Return:
2410 0 good, rcpt results in addr->transport_return (PENDING_OK, DEFER, FAIL)
2411 -1 MAIL response error
2412 -2 any non-MAIL read i/o error
2413 -3 non-MAIL response timeout
2414 -4 internal error; channel still usable
2415 -5 transmit failed
2416 */
2417
2418 int
2419 smtp_write_mail_and_rcpt_cmds(smtp_context * sx, int * yield)
2420 {
2421 address_item * addr;
2422 int address_count;
2423 int rc;
2424
2425 if (build_mailcmd_options(sx, sx->first_addr) != OK)
2426 {
2427 *yield = ERROR;
2428 return -4;
2429 }
2430
2431 /* From here until we send the DATA command, we can make use of PIPELINING
2432 if the server host supports it. The code has to be able to check the responses
2433 at any point, for when the buffer fills up, so we write it totally generally.
2434 When PIPELINING is off, each command written reports that it has flushed the
2435 buffer. */
2436
2437 sx->pending_MAIL = TRUE; /* The block starts with MAIL */
2438
2439 {
2440 uschar * s = sx->from_addr;
2441 #ifdef SUPPORT_I18N
2442 uschar * errstr = NULL;
2443
2444 /* If we must downconvert, do the from-address here. Remember we had to
2445 for the to-addresses (done below), and also (ugly) for re-doing when building
2446 the delivery log line. */
2447
2448 if ( sx->addrlist->prop.utf8_msg
2449 && (sx->addrlist->prop.utf8_downcvt || !(sx->peer_offered & OPTION_UTF8))
2450 )
2451 {
2452 if (s = string_address_utf8_to_alabel(s, &errstr), errstr)
2453 {
2454 set_errno_nohost(sx->addrlist, ERRNO_EXPANDFAIL, errstr, DEFER, FALSE);
2455 *yield = ERROR;
2456 return -4;
2457 }
2458 setflag(sx->addrlist, af_utf8_downcvt);
2459 }
2460 #endif
2461
2462 rc = smtp_write_command(&sx->outblock, pipelining_active ? SCMD_BUFFER : SCMD_FLUSH,
2463 "MAIL FROM:<%s>%s\r\n", s, sx->buffer);
2464 }
2465
2466 mail_command = string_copy(big_buffer); /* Save for later error message */
2467
2468 switch(rc)
2469 {
2470 case -1: /* Transmission error */
2471 return -5;
2472
2473 case +1: /* Cmd was sent */
2474 if (!smtp_read_response(&sx->inblock, sx->buffer, sizeof(sx->buffer), '2',
2475 sx->ob->command_timeout))
2476 {
2477 if (errno == 0 && sx->buffer[0] == '4')
2478 {
2479 errno = ERRNO_MAIL4XX;
2480 sx->addrlist->more_errno |= ((sx->buffer[1] - '0')*10 + sx->buffer[2] - '0') << 8;
2481 }
2482 return -1;
2483 }
2484 sx->pending_MAIL = FALSE;
2485 break;
2486
2487 /* otherwise zero: command queued for pipeline */
2488 }
2489
2490 /* Pass over all the relevant recipient addresses for this host, which are the
2491 ones that have status PENDING_DEFER. If we are using PIPELINING, we can send
2492 several before we have to read the responses for those seen so far. This
2493 checking is done by a subroutine because it also needs to be done at the end.
2494 Send only up to max_rcpt addresses at a time, leaving next_addr pointing to
2495 the next one if not all are sent.
2496
2497 In the MUA wrapper situation, we want to flush the PIPELINING buffer for the
2498 last address because we want to abort if any recipients have any kind of
2499 problem, temporary or permanent. We know that all recipient addresses will have
2500 the PENDING_DEFER status, because only one attempt is ever made, and we know
2501 that max_rcpt will be large, so all addresses will be done at once.
2502
2503 For verify we flush the pipeline after any (the only) rcpt address. */
2504
2505 for (addr = sx->first_addr, address_count = 0;
2506 addr && address_count < sx->max_rcpt;
2507 addr = addr->next) if (addr->transport_return == PENDING_DEFER)
2508 {
2509 int count;
2510 BOOL no_flush;
2511 uschar * rcpt_addr;
2512
2513 if (tcp_out_fastopen && !tcp_out_fastopen_logged)
2514 setflag(addr, af_tcp_fastopen);
2515
2516 addr->dsn_aware = sx->peer_offered & OPTION_DSN
2517 ? dsn_support_yes : dsn_support_no;
2518
2519 address_count++;
2520 no_flush = pipelining_active && !sx->verify
2521 && (!mua_wrapper || addr->next && address_count < sx->max_rcpt);
2522
2523 build_rcptcmd_options(sx, addr);
2524
2525 /* Now send the RCPT command, and process outstanding responses when
2526 necessary. After a timeout on RCPT, we just end the function, leaving the
2527 yield as OK, because this error can often mean that there is a problem with
2528 just one address, so we don't want to delay the host. */
2529
2530 rcpt_addr = transport_rcpt_address(addr, sx->tblock->rcpt_include_affixes);
2531
2532 #ifdef SUPPORT_I18N
2533 if ( testflag(sx->addrlist, af_utf8_downcvt)
2534 && !(rcpt_addr = string_address_utf8_to_alabel(rcpt_addr, NULL))
2535 )
2536 {
2537 /*XXX could we use a per-address errstr here? Not fail the whole send? */
2538 errno = ERRNO_EXPANDFAIL;
2539 return -5; /*XXX too harsh? */
2540 }
2541 #endif
2542
2543 count = smtp_write_command(&sx->outblock, no_flush ? SCMD_BUFFER : SCMD_FLUSH,
2544 "RCPT TO:<%s>%s%s\r\n", rcpt_addr, sx->igquotstr, sx->buffer);
2545
2546 if (count < 0) return -5;
2547 if (count > 0)
2548 {
2549 switch(sync_responses(sx, count, 0))
2550 {
2551 case 3: sx->ok = TRUE; /* 2xx & 5xx => OK & progress made */
2552 case 2: sx->completed_addr = TRUE; /* 5xx (only) => progress made */
2553 break;
2554
2555 case 1: sx->ok = TRUE; /* 2xx (only) => OK, but if LMTP, */
2556 if (!sx->lmtp) /* can't tell about progress yet */
2557 sx->completed_addr = TRUE;
2558 case 0: /* No 2xx or 5xx, but no probs */
2559 break;
2560
2561 case -1: return -3; /* Timeout on RCPT */
2562 case -2: return -2; /* non-MAIL read i/o error */
2563 default: return -1; /* any MAIL error */
2564 }
2565 sx->pending_MAIL = FALSE; /* Dealt with MAIL */
2566 }
2567 } /* Loop for next address */
2568
2569 tcp_out_fastopen_logged = TRUE;
2570 sx->next_addr = addr;
2571 return 0;
2572 }
2573
2574
2575 #ifdef SUPPORT_TLS
2576 /*****************************************************
2577 * Proxy TLS connection for another transport process *
2578 ******************************************************/
2579 /*
2580 Use the given buffer as a staging area, and select on both the given fd
2581 and the TLS'd client-fd for data to read (per the coding in ip_recv() and
2582 fd_ready() this is legitimate). Do blocking full-size writes, and reads
2583 under a timeout.
2584
2585 Arguments:
2586 buf space to use for buffering
2587 bufsiz size of buffer
2588 proxy_fd comms to proxied process
2589 timeout per-read timeout, seconds
2590 */
2591
2592 void
2593 smtp_proxy_tls(uschar * buf, size_t bsize, int proxy_fd, int timeout)
2594 {
2595 fd_set rfds, efds;
2596 int max_fd = MAX(proxy_fd, tls_out.active) + 1;
2597 int rc, i, fd_bits, nbytes;
2598
2599 set_process_info("proxying TLS connection for continued transport");
2600 FD_ZERO(&rfds);
2601 FD_SET(tls_out.active, &rfds);
2602 FD_SET(proxy_fd, &rfds);
2603
2604 for (fd_bits = 3; fd_bits; )
2605 {
2606 time_t time_left = timeout;
2607 time_t time_start = time(NULL);
2608
2609 /* wait for data */
2610 efds = rfds;
2611 do
2612 {
2613 struct timeval tv = { time_left, 0 };
2614
2615 rc = select(max_fd,
2616 (SELECT_ARG2_TYPE *)&rfds, NULL, (SELECT_ARG2_TYPE *)&efds, &tv);
2617
2618 if (rc < 0 && errno == EINTR)
2619 if ((time_left -= time(NULL) - time_start) > 0) continue;
2620
2621 if (rc <= 0)
2622 {
2623 DEBUG(D_transport) if (rc == 0) debug_printf("%s: timed out\n", __FUNCTION__);
2624 return;
2625 }
2626
2627 if (FD_ISSET(tls_out.active, &efds) || FD_ISSET(proxy_fd, &efds))
2628 {
2629 DEBUG(D_transport) debug_printf("select: exceptional cond on %s fd\n",
2630 FD_ISSET(proxy_fd, &efds) ? "proxy" : "tls");
2631 return;
2632 }
2633 }
2634 while (rc < 0 || !(FD_ISSET(tls_out.active, &rfds) || FD_ISSET(proxy_fd, &rfds)));
2635
2636 /* handle inbound data */
2637 if (FD_ISSET(tls_out.active, &rfds))
2638 if ((rc = tls_read(FALSE, buf, bsize)) <= 0)
2639 {
2640 fd_bits &= ~1;
2641 FD_CLR(tls_out.active, &rfds);
2642 shutdown(proxy_fd, SHUT_WR);
2643 timeout = 5;
2644 }
2645 else
2646 {
2647 for (nbytes = 0; rc - nbytes > 0; nbytes += i)
2648 if ((i = write(proxy_fd, buf + nbytes, rc - nbytes)) < 0) return;
2649 }
2650 else if (fd_bits & 1)
2651 FD_SET(tls_out.active, &rfds);
2652
2653 /* handle outbound data */
2654 if (FD_ISSET(proxy_fd, &rfds))
2655 if ((rc = read(proxy_fd, buf, bsize)) <= 0)
2656 {
2657 fd_bits = 0;
2658 tls_close(FALSE, TRUE);
2659 }
2660 else
2661 {
2662 for (nbytes = 0; rc - nbytes > 0; nbytes += i)
2663 if ((i = tls_write(FALSE, buf + nbytes, rc - nbytes, FALSE)) < 0)
2664 return;
2665 }
2666 else if (fd_bits & 2)
2667 FD_SET(proxy_fd, &rfds);
2668 }
2669 }
2670 #endif
2671
2672
2673 /*************************************************
2674 * Deliver address list to given host *
2675 *************************************************/
2676
2677 /* If continue_hostname is not null, we get here only when continuing to
2678 deliver down an existing channel. The channel was passed as the standard
2679 input. TLS is never active on a passed channel; the previous process always
2680 closes it down before passing the connection on.
2681
2682 Otherwise, we have to make a connection to the remote host, and do the
2683 initial protocol exchange.
2684
2685 When running as an MUA wrapper, if the sender or any recipient is rejected,
2686 temporarily or permanently, we force failure for all recipients.
2687
2688 Arguments:
2689 addrlist chain of potential addresses to deliver; only those whose
2690 transport_return field is set to PENDING_DEFER are currently
2691 being processed; others should be skipped - they have either
2692 been delivered to an earlier host or IP address, or been
2693 failed by one of them.
2694 host host to deliver to
2695 host_af AF_INET or AF_INET6
2696 defport default TCP/IP port to use if host does not specify, in host
2697 byte order
2698 interface interface to bind to, or NULL
2699 tblock transport instance block
2700 message_defer set TRUE if yield is OK, but all addresses were deferred
2701 because of a non-recipient, non-host failure, that is, a
2702 4xx response to MAIL FROM, DATA, or ".". This is a defer
2703 that is specific to the message.
2704 suppress_tls if TRUE, don't attempt a TLS connection - this is set for
2705 a second attempt after TLS initialization fails
2706
2707 Returns: OK - the connection was made and the delivery attempted;
2708 the result for each address is in its data block.
2709 DEFER - the connection could not be made, or something failed
2710 while setting up the SMTP session, or there was a
2711 non-message-specific error, such as a timeout.
2712 ERROR - a filter command is specified for this transport,
2713 and there was a problem setting it up; OR helo_data
2714 or add_headers or authenticated_sender is specified
2715 for this transport, and the string failed to expand
2716 */
2717
2718 static int
2719 smtp_deliver(address_item *addrlist, host_item *host, int host_af, int defport,
2720 uschar *interface, transport_instance *tblock,
2721 BOOL *message_defer, BOOL suppress_tls)
2722 {
2723 address_item *addr;
2724 int yield = OK;
2725 int save_errno;
2726 int rc;
2727 struct timeval start_delivery_time;
2728
2729 BOOL pass_message = FALSE;
2730 uschar *message = NULL;
2731 uschar new_message_id[MESSAGE_ID_LENGTH + 1];
2732
2733 smtp_context sx;
2734
2735 gettimeofday(&start_delivery_time, NULL);
2736 suppress_tls = suppress_tls; /* stop compiler warning when no TLS support */
2737 *message_defer = FALSE;
2738
2739 sx.addrlist = addrlist;
2740 sx.host = host;
2741 sx.host_af = host_af,
2742 sx.port = defport;
2743 sx.interface = interface;
2744 sx.helo_data = NULL;
2745 sx.tblock = tblock;
2746 sx.verify = FALSE;
2747
2748 /* Get the channel set up ready for a message (MAIL FROM being the next
2749 SMTP command to send */
2750
2751 if ((rc = smtp_setup_conn(&sx, suppress_tls)) != OK)
2752 return rc;
2753
2754 /* If there is a filter command specified for this transport, we can now
2755 set it up. This cannot be done until the identify of the host is known. */
2756
2757 if (tblock->filter_command)
2758 {
2759 transport_filter_timeout = tblock->filter_timeout;
2760
2761 /* On failure, copy the error to all addresses, abandon the SMTP call, and
2762 yield ERROR. */
2763
2764 if (!transport_set_up_command(&transport_filter_argv,
2765 tblock->filter_command, TRUE, DEFER, addrlist,
2766 string_sprintf("%.50s transport", tblock->name), NULL))
2767 {
2768 set_errno_nohost(addrlist->next, addrlist->basic_errno, addrlist->message, DEFER,
2769 FALSE);
2770 yield = ERROR;
2771 goto SEND_QUIT;
2772 }
2773
2774 if ( transport_filter_argv
2775 && *transport_filter_argv
2776 && **transport_filter_argv
2777 && sx.peer_offered & OPTION_CHUNKING
2778 )
2779 {
2780 sx.peer_offered &= ~OPTION_CHUNKING;
2781 DEBUG(D_transport) debug_printf("CHUNKING not usable due to transport filter\n");
2782 }
2783 }
2784
2785 sx.first_addr = addrlist;
2786
2787 /* For messages that have more than the maximum number of envelope recipients,
2788 we want to send several transactions down the same SMTP connection. (See
2789 comments in deliver.c as to how this reconciles, heuristically, with
2790 remote_max_parallel.) This optimization was added to Exim after the following
2791 code was already working. The simplest way to put it in without disturbing the
2792 code was to use a goto to jump back to this point when there is another
2793 transaction to handle. */
2794
2795 SEND_MESSAGE:
2796 sx.from_addr = return_path;
2797 sx.sync_addr = sx.first_addr;
2798 sx.ok = FALSE;
2799 sx.send_rset = TRUE;
2800 sx.completed_addr = FALSE;
2801
2802
2803 /* If we are a continued-connection-after-verify the MAIL and RCPT
2804 commands were already sent; do not re-send but do mark the addrs as
2805 having been accepted up to RCPT stage. A traditional cont-conn
2806 always has a sequence number greater than one. */
2807
2808 if (continue_hostname && continue_sequence == 1)
2809 {
2810 address_item * addr;
2811
2812 sx.peer_offered = smtp_peer_options;
2813 sx.pending_MAIL = FALSE;
2814 sx.ok = TRUE;
2815 sx.next_addr = NULL;
2816
2817 for (addr = addrlist; addr; addr = addr->next)
2818 addr->transport_return = PENDING_OK;
2819 }
2820 else
2821 {
2822 /* Initiate a message transfer. */
2823
2824 switch(smtp_write_mail_and_rcpt_cmds(&sx, &yield))
2825 {
2826 case 0: break;
2827 case -1: case -2: goto RESPONSE_FAILED;
2828 case -3: goto END_OFF;
2829 case -4: goto SEND_QUIT;
2830 default: goto SEND_FAILED;
2831 }
2832
2833 /* If we are an MUA wrapper, abort if any RCPTs were rejected, either
2834 permanently or temporarily. We should have flushed and synced after the last
2835 RCPT. */
2836
2837 if (mua_wrapper)
2838 {
2839 address_item * a;
2840 unsigned cnt;
2841
2842 for (a = sx.first_addr, cnt = 0; a && cnt < sx.max_rcpt; a = a->next, cnt++)
2843 if (a->transport_return != PENDING_OK)
2844 {
2845 /*XXX could we find a better errno than 0 here? */
2846 set_errno_nohost(addrlist, 0, a->message, FAIL,
2847 testflag(a, af_pass_message));
2848 sx.ok = FALSE;
2849 break;
2850 }
2851 }
2852 }
2853
2854 /* If ok is TRUE, we know we have got at least one good recipient, and must now
2855 send DATA, but if it is FALSE (in the normal, non-wrapper case), we may still
2856 have a good recipient buffered up if we are pipelining. We don't want to waste
2857 time sending DATA needlessly, so we only send it if either ok is TRUE or if we
2858 are pipelining. The responses are all handled by sync_responses().
2859 If using CHUNKING, do not send a BDAT until we know how big a chunk we want
2860 to send is. */
2861
2862 if ( !(sx.peer_offered & OPTION_CHUNKING)
2863 && (sx.ok || (pipelining_active && !mua_wrapper)))
2864 {
2865 int count = smtp_write_command(&sx.outblock, SCMD_FLUSH, "DATA\r\n");
2866
2867 if (count < 0) goto SEND_FAILED;
2868 switch(sync_responses(&sx, count, sx.ok ? +1 : -1))
2869 {
2870 case 3: sx.ok = TRUE; /* 2xx & 5xx => OK & progress made */
2871 case 2: sx.completed_addr = TRUE; /* 5xx (only) => progress made */
2872 break;
2873
2874 case 1: sx.ok = TRUE; /* 2xx (only) => OK, but if LMTP, */
2875 if (!sx.lmtp) sx.completed_addr = TRUE; /* can't tell about progress yet */
2876 case 0: break; /* No 2xx or 5xx, but no probs */
2877
2878 case -1: goto END_OFF; /* Timeout on RCPT */
2879 default: goto RESPONSE_FAILED; /* I/O error, or any MAIL/DATA error */
2880 }
2881 pipelining_active = FALSE;
2882 data_command = string_copy(big_buffer); /* Save for later error message */
2883 }
2884
2885 /* If there were no good recipients (but otherwise there have been no
2886 problems), just set ok TRUE, since we have handled address-specific errors
2887 already. Otherwise, it's OK to send the message. Use the check/escape mechanism
2888 for handling the SMTP dot-handling protocol, flagging to apply to headers as
2889 well as body. Set the appropriate timeout value to be used for each chunk.
2890 (Haven't been able to make it work using select() for writing yet.) */
2891
2892 if (!(sx.peer_offered & OPTION_CHUNKING) && !sx.ok)
2893 {
2894 /* Save the first address of the next batch. */
2895 sx.first_addr = sx.next_addr;
2896
2897 sx.ok = TRUE;
2898 }
2899 else
2900 {
2901 transport_ctx tctx = {
2902 {sx.inblock.sock},
2903 tblock,
2904 addrlist,
2905 US".", US"..", /* Escaping strings */
2906 topt_use_crlf | topt_escape_headers
2907 | (tblock->body_only ? topt_no_headers : 0)
2908 | (tblock->headers_only ? topt_no_body : 0)
2909 | (tblock->return_path_add ? topt_add_return_path : 0)
2910 | (tblock->delivery_date_add ? topt_add_delivery_date : 0)
2911 | (tblock->envelope_to_add ? topt_add_envelope_to : 0)
2912 };
2913
2914 /* If using CHUNKING we need a callback from the generic transport
2915 support to us, for the sending of BDAT smtp commands and the reaping
2916 of responses. The callback needs a whole bunch of state so set up
2917 a transport-context structure to be passed around. */
2918
2919 if (sx.peer_offered & OPTION_CHUNKING)
2920 {
2921 tctx.check_string = tctx.escape_string = NULL;
2922 tctx.options |= topt_use_bdat;
2923 tctx.chunk_cb = smtp_chunk_cmd_callback;
2924 sx.pending_BDAT = FALSE;
2925 sx.good_RCPT = sx.ok;
2926 sx.cmd_count = 0;
2927 tctx.smtp_context = &sx;
2928 }
2929 else
2930 tctx.options |= topt_end_dot;
2931
2932 /* Save the first address of the next batch. */
2933 sx.first_addr = sx.next_addr;
2934
2935 /* Responses from CHUNKING commands go in buffer. Otherwise,
2936 there has not been a response. */
2937
2938 sx.buffer[0] = 0;
2939
2940 sigalrm_seen = FALSE;
2941 transport_write_timeout = sx.ob->data_timeout;
2942 smtp_command = US"sending data block"; /* For error messages */
2943 DEBUG(D_transport|D_v)
2944 if (sx.peer_offered & OPTION_CHUNKING)
2945 debug_printf(" will write message using CHUNKING\n");
2946 else
2947 debug_printf(" SMTP>> writing message and terminating \".\"\n");
2948 transport_count = 0;
2949
2950 #ifndef DISABLE_DKIM
2951 sx.ok = dkim_transport_write_message(&tctx, &sx.ob->dkim, CUSS &message);
2952 #else
2953 sx.ok = transport_write_message(&tctx, 0);
2954 #endif
2955
2956 /* transport_write_message() uses write() because it is called from other
2957 places to write to non-sockets. This means that under some OS (e.g. Solaris)
2958 it can exit with "Broken pipe" as its error. This really means that the
2959 socket got closed at the far end. */
2960
2961 transport_write_timeout = 0; /* for subsequent transports */
2962
2963 /* Failure can either be some kind of I/O disaster (including timeout),
2964 or the failure of a transport filter or the expansion of added headers.
2965 Or, when CHUNKING, it can be a protocol-detected failure. */
2966
2967 if (!sx.ok)
2968 if (message) goto SEND_FAILED;
2969 else goto RESPONSE_FAILED;
2970
2971 /* We used to send the terminating "." explicitly here, but because of
2972 buffering effects at both ends of TCP/IP connections, you don't gain
2973 anything by keeping it separate, so it might as well go in the final
2974 data buffer for efficiency. This is now done by setting the topt_end_dot
2975 flag above. */
2976
2977 smtp_command = US"end of data";
2978
2979 if (sx.peer_offered & OPTION_CHUNKING && sx.cmd_count > 1)
2980 {
2981 /* Reap any outstanding MAIL & RCPT commands, but not a DATA-go-ahead */
2982 switch(sync_responses(&sx, sx.cmd_count-1, 0))
2983 {
2984 case 3: sx.ok = TRUE; /* 2xx & 5xx => OK & progress made */
2985 case 2: sx.completed_addr = TRUE; /* 5xx (only) => progress made */
2986 break;
2987
2988 case 1: sx.ok = TRUE; /* 2xx (only) => OK, but if LMTP, */
2989 if (!sx.lmtp) sx.completed_addr = TRUE; /* can't tell about progress yet */
2990 case 0: break; /* No 2xx or 5xx, but no probs */
2991
2992 case -1: goto END_OFF; /* Timeout on RCPT */
2993 default: goto RESPONSE_FAILED; /* I/O error, or any MAIL/DATA error */
2994 }
2995 }
2996
2997 #ifndef DISABLE_PRDR
2998 /* For PRDR we optionally get a partial-responses warning
2999 * followed by the individual responses, before going on with
3000 * the overall response. If we don't get the warning then deal
3001 * with per non-PRDR. */
3002 if(sx.prdr_active)
3003 {
3004 sx.ok = smtp_read_response(&sx.inblock, sx.buffer, sizeof(sx.buffer), '3',
3005 sx.ob->final_timeout);
3006 if (!sx.ok && errno == 0) switch(sx.buffer[0])
3007 {
3008 case '2': sx.prdr_active = FALSE;
3009 sx.ok = TRUE;
3010 break;
3011 case '4': errno = ERRNO_DATA4XX;
3012 addrlist->more_errno |=
3013 ((sx.buffer[1] - '0')*10 + sx.buffer[2] - '0') << 8;
3014 break;
3015 }
3016 }
3017 else
3018 #endif
3019
3020 /* For non-PRDR SMTP, we now read a single response that applies to the
3021 whole message. If it is OK, then all the addresses have been delivered. */
3022
3023 if (!sx.lmtp)
3024 {
3025 sx.ok = smtp_read_response(&sx.inblock, sx.buffer, sizeof(sx.buffer), '2',
3026 sx.ob->final_timeout);
3027 if (!sx.ok && errno == 0 && sx.buffer[0] == '4')
3028 {
3029 errno = ERRNO_DATA4XX;
3030 addrlist->more_errno |= ((sx.buffer[1] - '0')*10 + sx.buffer[2] - '0') << 8;
3031 }
3032 }
3033
3034 /* For LMTP, we get back a response for every RCPT command that we sent;
3035 some may be accepted and some rejected. For those that get a response, their
3036 status is fixed; any that are accepted have been handed over, even if later
3037 responses crash - at least, that's how I read RFC 2033.
3038
3039 If all went well, mark the recipient addresses as completed, record which
3040 host/IPaddress they were delivered to, and cut out RSET when sending another
3041 message down the same channel. Write the completed addresses to the journal
3042 now so that they are recorded in case there is a crash of hardware or
3043 software before the spool gets updated. Also record the final SMTP
3044 confirmation if needed (for SMTP only). */
3045
3046 if (sx.ok)
3047 {
3048 int flag = '=';
3049 struct timeval delivery_time;
3050 int len;
3051 uschar * conf = NULL;
3052
3053 timesince(&delivery_time, &start_delivery_time);
3054 sx.send_rset = FALSE;
3055 pipelining_active = FALSE;
3056
3057 /* Set up confirmation if needed - applies only to SMTP */
3058
3059 if (
3060 #ifdef DISABLE_EVENT
3061 LOGGING(smtp_confirmation) &&
3062 #endif
3063 !sx.lmtp
3064 )
3065 {
3066 const uschar *s = string_printing(sx.buffer);
3067 /* deconst cast ok here as string_printing was checked to have alloc'n'copied */
3068 conf = (s == sx.buffer)? US string_copy(s) : US s;
3069 }
3070
3071 /* Process all transported addresses - for LMTP or PRDR, read a status for
3072 each one. */
3073
3074 for (addr = addrlist; addr != sx.first_addr; addr = addr->next)
3075 {
3076 if (addr->transport_return != PENDING_OK) continue;
3077
3078 /* LMTP - if the response fails badly (e.g. timeout), use it for all the
3079 remaining addresses. Otherwise, it's a return code for just the one
3080 address. For temporary errors, add a retry item for the address so that
3081 it doesn't get tried again too soon. */
3082
3083 #ifndef DISABLE_PRDR
3084 if (sx.lmtp || sx.prdr_active)
3085 #else
3086 if (sx.lmtp)
3087 #endif
3088 {
3089 if (!smtp_read_response(&sx.inblock, sx.buffer, sizeof(sx.buffer), '2',
3090 sx.ob->final_timeout))
3091 {
3092 if (errno != 0 || sx.buffer[0] == 0) goto RESPONSE_FAILED;
3093 addr->message = string_sprintf(
3094 #ifndef DISABLE_PRDR
3095 "%s error after %s: %s", sx.prdr_active ? "PRDR":"LMTP",
3096 #else
3097 "LMTP error after %s: %s",
3098 #endif
3099 data_command, string_printing(sx.buffer));
3100 setflag(addr, af_pass_message); /* Allow message to go to user */
3101 if (sx.buffer[0] == '5')
3102 addr->transport_return = FAIL;
3103 else
3104 {
3105 errno = ERRNO_DATA4XX;
3106 addr->more_errno |= ((sx.buffer[1] - '0')*10 + sx.buffer[2] - '0') << 8;
3107 addr->transport_return = DEFER;
3108 #ifndef DISABLE_PRDR
3109 if (!sx.prdr_active)
3110 #endif
3111 retry_add_item(addr, addr->address_retry_key, 0);
3112 }
3113 continue;
3114 }
3115 sx.completed_addr = TRUE; /* NOW we can set this flag */
3116 if (LOGGING(smtp_confirmation))
3117 {
3118 const uschar *s = string_printing(sx.buffer);
3119 /* deconst cast ok here as string_printing was checked to have alloc'n'copied */
3120 conf = (s == sx.buffer) ? US string_copy(s) : US s;
3121 }
3122 }
3123
3124 /* SMTP, or success return from LMTP for this address. Pass back the
3125 actual host that was used. */
3126
3127 addr->transport_return = OK;
3128 addr->more_errno = delivery_time.tv_sec;
3129 addr->delivery_usec = delivery_time.tv_usec;
3130 addr->host_used = host;
3131 addr->special_action = flag;
3132 addr->message = conf;
3133 #ifndef DISABLE_PRDR
3134 if (sx.prdr_active) setflag(addr, af_prdr_used);
3135 #endif
3136 if (sx.peer_offered & OPTION_CHUNKING) setflag(addr, af_chunking_used);
3137 flag = '-';
3138
3139 #ifndef DISABLE_PRDR
3140 if (!sx.prdr_active)
3141 #endif
3142 {
3143 /* Update the journal. For homonymic addresses, use the base address plus
3144 the transport name. See lots of comments in deliver.c about the reasons
3145 for the complications when homonyms are involved. Just carry on after
3146 write error, as it may prove possible to update the spool file later. */
3147
3148 if (testflag(addr, af_homonym))
3149 sprintf(CS sx.buffer, "%.500s/%s\n", addr->unique + 3, tblock->name);
3150 else
3151 sprintf(CS sx.buffer, "%.500s\n", addr->unique);
3152
3153 DEBUG(D_deliver) debug_printf("S:journalling %s", sx.buffer);
3154 len = Ustrlen(CS sx.buffer);
3155 if (write(journal_fd, sx.buffer, len) != len)
3156 log_write(0, LOG_MAIN|LOG_PANIC, "failed to write journal for "
3157 "%s: %s", sx.buffer, strerror(errno));
3158 }
3159 }
3160
3161 #ifndef DISABLE_PRDR
3162 if (sx.prdr_active)
3163 {
3164 /* PRDR - get the final, overall response. For any non-success
3165 upgrade all the address statuses. */
3166 sx.ok = smtp_read_response(&sx.inblock, sx.buffer, sizeof(sx.buffer), '2',
3167 sx.ob->final_timeout);
3168 if (!sx.ok)
3169 {
3170 if(errno == 0 && sx.buffer[0] == '4')
3171 {
3172 errno = ERRNO_DATA4XX;
3173 addrlist->more_errno |= ((sx.buffer[1] - '0')*10 + sx.buffer[2] - '0') << 8;
3174 }
3175 for (addr = addrlist; addr != sx.first_addr; addr = addr->next)
3176 if (sx.buffer[0] == '5' || addr->transport_return == OK)
3177 addr->transport_return = PENDING_OK; /* allow set_errno action */
3178 goto RESPONSE_FAILED;
3179 }
3180
3181 /* Update the journal, or setup retry. */
3182 for (addr = addrlist; addr != sx.first_addr; addr = addr->next)
3183 if (addr->transport_return == OK)
3184 {
3185 if (testflag(addr, af_homonym))
3186 sprintf(CS sx.buffer, "%.500s/%s\n", addr->unique + 3, tblock->name);
3187 else
3188 sprintf(CS sx.buffer, "%.500s\n", addr->unique);
3189
3190 DEBUG(D_deliver) debug_printf("journalling(PRDR) %s\n", sx.buffer);
3191 len = Ustrlen(CS sx.buffer);
3192 if (write(journal_fd, sx.buffer, len) != len)
3193 log_write(0, LOG_MAIN|LOG_PANIC, "failed to write journal for "
3194 "%s: %s", sx.buffer, strerror(errno));
3195 }
3196 else if (addr->transport_return == DEFER)
3197 retry_add_item(addr, addr->address_retry_key, -2);
3198 }
3199 #endif
3200
3201 /* Ensure the journal file is pushed out to disk. */
3202
3203 if (EXIMfsync(journal_fd) < 0)
3204 log_write(0, LOG_MAIN|LOG_PANIC, "failed to fsync journal: %s",
3205 strerror(errno));
3206 }
3207 }
3208
3209
3210 /* Handle general (not specific to one address) failures here. The value of ok
3211 is used to skip over this code on the falling through case. A timeout causes a
3212 deferral. Other errors may defer or fail according to the response code, and
3213 may set up a special errno value, e.g. after connection chopped, which is
3214 assumed if errno == 0 and there is no text in the buffer. If control reaches
3215 here during the setting up phase (i.e. before MAIL FROM) then always defer, as
3216 the problem is not related to this specific message. */
3217
3218 if (!sx.ok)
3219 {
3220 int code, set_rc;
3221 uschar * set_message;
3222
3223 RESPONSE_FAILED:
3224 {
3225 save_errno = errno;
3226 message = NULL;
3227 sx.send_quit = check_response(host, &save_errno, addrlist->more_errno,
3228 sx.buffer, &code, &message, &pass_message);
3229 goto FAILED;
3230 }
3231
3232 SEND_FAILED:
3233 {
3234 save_errno = errno;
3235 code = '4';
3236 message = string_sprintf("send() to %s [%s] failed: %s",
3237 host->name, host->address, message ? message : US strerror(save_errno));
3238 sx.send_quit = FALSE;
3239 goto FAILED;
3240 }
3241
3242 FAILED:
3243 {
3244 BOOL message_error;
3245
3246 sx.ok = FALSE; /* For when reached by GOTO */
3247 set_message = message;
3248
3249 /* We want to handle timeouts after MAIL or "." and loss of connection after
3250 "." specially. They can indicate a problem with the sender address or with
3251 the contents of the message rather than a real error on the connection. These
3252 cases are treated in the same way as a 4xx response. This next bit of code
3253 does the classification. */
3254
3255 switch(save_errno)
3256 {
3257 case 0:
3258 case ERRNO_MAIL4XX:
3259 case ERRNO_DATA4XX:
3260 message_error = TRUE;
3261 break;
3262
3263 case ETIMEDOUT:
3264 message_error = Ustrncmp(smtp_command,"MAIL",4) == 0 ||
3265 Ustrncmp(smtp_command,"end ",4) == 0;
3266 break;
3267
3268 case ERRNO_SMTPCLOSED:
3269 message_error = Ustrncmp(smtp_command,"end ",4) == 0;
3270 break;
3271
3272 default:
3273 message_error = FALSE;
3274 break;
3275 }
3276
3277 /* Handle the cases that are treated as message errors. These are:
3278
3279 (a) negative response or timeout after MAIL
3280 (b) negative response after DATA
3281 (c) negative response or timeout or dropped connection after "."
3282 (d) utf8 support required and not offered
3283
3284 It won't be a negative response or timeout after RCPT, as that is dealt
3285 with separately above. The action in all cases is to set an appropriate
3286 error code for all the addresses, but to leave yield set to OK because the
3287 host itself has not failed. Of course, it might in practice have failed
3288 when we've had a timeout, but if so, we'll discover that at the next
3289 delivery attempt. For a temporary error, set the message_defer flag, and
3290 write to the logs for information if this is not the last host. The error
3291 for the last host will be logged as part of the address's log line. */
3292
3293 if (message_error)
3294 {
3295 if (mua_wrapper) code = '5'; /* Force hard failure in wrapper mode */
3296
3297 /* If there's an errno, the message contains just the identity of
3298 the host. */
3299
3300 if (code == '5')
3301 set_rc = FAIL;
3302 else /* Anything other than 5 is treated as temporary */
3303 {
3304 set_rc = DEFER;
3305 if (save_errno > 0)
3306 message = US string_sprintf("%s: %s", message, strerror(save_errno));
3307 if (host->next != NULL) log_write(0, LOG_MAIN, "%s", message);
3308 msglog_line(host, message);
3309 *message_defer = TRUE;
3310 }
3311 }
3312
3313 /* Otherwise, we have an I/O error or a timeout other than after MAIL or
3314 ".", or some other transportation error. We defer all addresses and yield
3315 DEFER, except for the case of failed add_headers expansion, or a transport
3316 filter failure, when the yield should be ERROR, to stop it trying other
3317 hosts. */
3318
3319 else
3320 {
3321 set_rc = DEFER;
3322 yield = (save_errno == ERRNO_CHHEADER_FAIL ||
3323 save_errno == ERRNO_FILTER_FAIL)? ERROR : DEFER;
3324 }
3325 }
3326
3327 set_errno(addrlist, save_errno, set_message, set_rc, pass_message, host
3328 #ifdef EXPERIMENTAL_DSN_INFO
3329 , sx.smtp_greeting, sx.helo_response
3330 #endif
3331 );
3332 }
3333
3334
3335 /* If all has gone well, send_quit will be set TRUE, implying we can end the
3336 SMTP session tidily. However, if there were too many addresses to send in one
3337 message (indicated by first_addr being non-NULL) we want to carry on with the
3338 rest of them. Also, it is desirable to send more than one message down the SMTP
3339 connection if there are several waiting, provided we haven't already sent so
3340 many as to hit the configured limit. The function transport_check_waiting looks
3341 for a waiting message and returns its id. Then transport_pass_socket tries to
3342 set up a continued delivery by passing the socket on to another process. The
3343 variable send_rset is FALSE if a message has just been successfully transfered.
3344
3345 If we are already sending down a continued channel, there may be further
3346 addresses not yet delivered that are aimed at the same host, but which have not
3347 been passed in this run of the transport. In this case, continue_more will be
3348 true, and all we should do is send RSET if necessary, and return, leaving the
3349 channel open.
3350
3351 However, if no address was disposed of, i.e. all addresses got 4xx errors, we
3352 do not want to continue with other messages down the same channel, because that
3353 can lead to looping between two or more messages, all with the same,
3354 temporarily failing address(es). [The retry information isn't updated yet, so
3355 new processes keep on trying.] We probably also don't want to try more of this
3356 message's addresses either.
3357
3358 If we have started a TLS session, we have to end it before passing the
3359 connection to a new process. However, not all servers can handle this (Exim
3360 can), so we do not pass such a connection on if the host matches
3361 hosts_nopass_tls. */
3362
3363 DEBUG(D_transport)
3364 debug_printf("ok=%d send_quit=%d send_rset=%d continue_more=%d "
3365 "yield=%d first_address is %sNULL\n", sx.ok, sx.send_quit,
3366 sx.send_rset, continue_more, yield, sx.first_addr ? "not " : "");
3367
3368 if (sx.completed_addr && sx.ok && sx.send_quit)
3369 {
3370 BOOL more;
3371 smtp_compare_t t_compare;
3372
3373 t_compare.tblock = tblock;
3374 t_compare.current_sender_address = sender_address;
3375
3376 if ( sx.first_addr != NULL
3377 || continue_more
3378 || (
3379 #ifdef SUPPORT_TLS
3380 ( tls_out.active < 0 && !continue_proxy_cipher
3381 || verify_check_given_host(&sx.ob->hosts_nopass_tls, host) != OK
3382 )
3383 &&
3384 #endif
3385 transport_check_waiting(tblock->name, host->name,
3386 tblock->connection_max_messages, new_message_id, &more,
3387 (oicf)smtp_are_same_identities, (void*)&t_compare)
3388 ) )
3389 {
3390 uschar *msg;
3391 BOOL pass_message;
3392
3393 if (sx.send_rset)
3394 if (! (sx.ok = smtp_write_command(&sx.outblock, SCMD_FLUSH, "RSET\r\n") >= 0))
3395 {
3396 msg = US string_sprintf("send() to %s [%s] failed: %s", host->name,
3397 host->address, strerror(errno));
3398 sx.send_quit = FALSE;
3399 }
3400 else if (! (sx.ok = smtp_read_response(&sx.inblock, sx.buffer,
3401 sizeof(sx.buffer), '2', sx.ob->command_timeout)))
3402 {
3403 int code;
3404 sx.send_quit = check_response(host, &errno, 0, sx.buffer, &code, &msg,
3405 &pass_message);
3406 if (!sx.send_quit)
3407 {
3408 DEBUG(D_transport) debug_printf("H=%s [%s] %s\n",
3409 host->name, host->address, msg);
3410 }
3411 }
3412
3413 /* Either RSET was not needed, or it succeeded */
3414
3415 if (sx.ok)
3416 {
3417 int pfd[2];
3418 int socket_fd = sx.inblock.sock;
3419
3420
3421 if (sx.first_addr != NULL) /* More addresses still to be sent */
3422 { /* in this run of the transport */
3423 continue_sequence++; /* Causes * in logging */
3424 goto SEND_MESSAGE;
3425 }
3426
3427 /* Unless caller said it already has more messages listed for this host,
3428 pass the connection on to a new Exim process (below, the call to
3429 transport_pass_socket). If the caller has more ready, just return with
3430 the connection still open. */
3431
3432 #ifdef SUPPORT_TLS
3433 if (tls_out.active >= 0)
3434 if ( continue_more
3435 || verify_check_given_host(&sx.ob->hosts_noproxy_tls, host) == OK)
3436 {
3437 /* Before passing the socket on, or returning to caller with it still
3438 open, we must shut down TLS. Not all MTAs allow for the continuation
3439 of the SMTP session when TLS is shut down. We test for this by sending
3440 a new EHLO. If we don't get a good response, we don't attempt to pass
3441 the socket on. */
3442
3443 tls_close(FALSE, TRUE);
3444 smtp_peer_options = smtp_peer_options_wrap;
3445 sx.ok = !sx.smtps
3446 && smtp_write_command(&sx.outblock, SCMD_FLUSH,
3447 "EHLO %s\r\n", sx.helo_data) >= 0
3448 && smtp_read_response(&sx.inblock, sx.buffer, sizeof(sx.buffer),
3449 '2', sx.ob->command_timeout);
3450
3451 if (sx.ok && continue_more)
3452 return yield; /* More addresses for another run */
3453 }
3454 else
3455 {
3456 /* Set up a pipe for proxying TLS for the new transport process */
3457
3458 smtp_peer_options |= OPTION_TLS;
3459 if (sx.ok = (socketpair(AF_UNIX, SOCK_STREAM, 0, pfd) == 0))
3460 socket_fd = pfd[1];
3461 else
3462 set_errno(sx.first_addr, errno, US"internal allocation problem",
3463 DEFER, FALSE, host
3464 # ifdef EXPERIMENTAL_DSN_INFO
3465 , sx.smtp_greeting, sx.helo_response
3466 # endif
3467 );
3468 }
3469 else
3470 #endif
3471 if (continue_more)
3472 return yield; /* More addresses for another run */
3473
3474 /* If the socket is successfully passed, we mustn't send QUIT (or
3475 indeed anything!) from here. */
3476
3477 /*XXX DSN_INFO: assume likely to do new HELO; but for greet we'll want to
3478 propagate it from the initial
3479 */
3480 if (sx.ok && transport_pass_socket(tblock->name, host->name,
3481 host->address, new_message_id, socket_fd))
3482 {
3483 sx.send_quit = FALSE;
3484
3485 /* If TLS is still active, we need to proxy it for the transport we
3486 just passed the baton to. Fork a child to to do it, and return to
3487 get logging done asap. Which way to place the work makes assumptions
3488 about post-fork prioritisation which may not hold on all platforms. */
3489 #ifdef SUPPORT_TLS
3490 if (tls_out.active >= 0)
3491 {
3492 int pid = fork();
3493 if (pid > 0) /* parent */
3494 {
3495 DEBUG(D_transport) debug_printf("proxy-proc inter-pid %d\n", pid);
3496 close(pfd[0]);
3497 waitpid(pid, NULL, 0);
3498 tls_close(FALSE, FALSE);
3499 (void)close(sx.inblock.sock);
3500 continue_transport = NULL;
3501 continue_hostname = NULL;
3502 return yield;
3503 }
3504 else if (pid == 0) /* child; fork again to disconnect totally */
3505 {
3506 close(pfd[1]);
3507 if ((pid = fork()))
3508 {
3509 DEBUG(D_transport) debug_printf("proxy-prox final-pid %d\n", pid);
3510 _exit(pid ? EXIT_FAILURE : EXIT_SUCCESS);
3511 }
3512 smtp_proxy_tls(sx.buffer, sizeof(sx.buffer), pfd[0], sx.ob->command_timeout);
3513 exim_exit(0);
3514 }
3515 }
3516 #endif
3517 }
3518 }
3519
3520 /* If RSET failed and there are addresses left, they get deferred. */
3521 else
3522 set_errno(sx.first_addr, errno, msg, DEFER, FALSE, host
3523 #ifdef EXPERIMENTAL_DSN_INFO
3524 , sx.smtp_greeting, sx.helo_response
3525 #endif
3526 );
3527 }
3528 }
3529
3530 /* End off tidily with QUIT unless the connection has died or the socket has
3531 been passed to another process. There has been discussion on the net about what
3532 to do after sending QUIT. The wording of the RFC suggests that it is necessary
3533 to wait for a response, but on the other hand, there isn't anything one can do
3534 with an error response, other than log it. Exim used to do that. However,
3535 further discussion suggested that it is positively advantageous not to wait for
3536 the response, but to close the session immediately. This is supposed to move
3537 the TCP/IP TIME_WAIT state from the server to the client, thereby removing some
3538 load from the server. (Hosts that are both servers and clients may not see much
3539 difference, of course.) Further discussion indicated that this was safe to do
3540 on Unix systems which have decent implementations of TCP/IP that leave the
3541 connection around for a while (TIME_WAIT) after the application has gone away.
3542 This enables the response sent by the server to be properly ACKed rather than
3543 timed out, as can happen on broken TCP/IP implementations on other OS.
3544
3545 This change is being made on 31-Jul-98. After over a year of trouble-free
3546 operation, the old commented-out code was removed on 17-Sep-99. */
3547
3548 SEND_QUIT:
3549 if (sx.send_quit) (void)smtp_write_command(&sx.outblock, SCMD_FLUSH, "QUIT\r\n");
3550
3551 END_OFF:
3552
3553 #ifdef SUPPORT_TLS
3554 tls_close(FALSE, TRUE);
3555 #endif
3556
3557 /* Close the socket, and return the appropriate value, first setting
3558 works because the NULL setting is passed back to the calling process, and
3559 remote_max_parallel is forced to 1 when delivering over an existing connection,
3560
3561 If all went well and continue_more is set, we shouldn't actually get here if
3562 there are further addresses, as the return above will be taken. However,
3563 writing RSET might have failed, or there may be other addresses whose hosts are
3564 specified in the transports, and therefore not visible at top level, in which
3565 case continue_more won't get set. */
3566
3567 HDEBUG(D_transport|D_acl|D_v) debug_printf_indent(" SMTP(close)>>\n");
3568 if (sx.send_quit)
3569 {
3570 shutdown(sx.outblock.sock, SHUT_WR);
3571 if (fcntl(sx.inblock.sock, F_SETFL, O_NONBLOCK) == 0)
3572 for (rc = 16; read(sx.inblock.sock, sx.inbuffer, sizeof(sx.inbuffer)) > 0 && rc > 0;)
3573 rc--; /* drain socket */
3574 }
3575 (void)close(sx.inblock.sock);
3576
3577 #ifndef DISABLE_EVENT
3578 (void) event_raise(tblock->event_action, US"tcp:close", NULL);
3579 #endif
3580
3581 continue_transport = NULL;
3582 continue_hostname = NULL;
3583 return yield;
3584 }
3585
3586
3587
3588
3589 /*************************************************
3590 * Closedown entry point *
3591 *************************************************/
3592
3593 /* This function is called when exim is passed an open smtp channel
3594 from another incarnation, but the message which it has been asked
3595 to deliver no longer exists. The channel is on stdin.
3596
3597 We might do fancy things like looking for another message to send down
3598 the channel, but if the one we sought has gone, it has probably been
3599 delivered by some other process that itself will seek further messages,
3600 so just close down our connection.
3601
3602 Argument: pointer to the transport instance block
3603 Returns: nothing
3604 */
3605
3606 void
3607 smtp_transport_closedown(transport_instance *tblock)
3608 {
3609 smtp_transport_options_block *ob =
3610 (smtp_transport_options_block *)tblock->options_block;
3611 smtp_inblock inblock;
3612 smtp_outblock outblock;
3613 uschar buffer[256];
3614 uschar inbuffer[4096];
3615 uschar outbuffer[16];
3616
3617 inblock.sock = fileno(stdin);
3618 inblock.buffer = inbuffer;
3619 inblock.buffersize = sizeof(inbuffer);
3620 inblock.ptr = inbuffer;
3621 inblock.ptrend = inbuffer;
3622
3623 outblock.sock = inblock.sock;
3624 outblock.buffersize = sizeof(outbuffer);
3625 outblock.buffer = outbuffer;
3626 outblock.ptr = outbuffer;
3627 outblock.cmd_count = 0;
3628 outblock.authenticating = FALSE;
3629
3630 (void)smtp_write_command(&outblock, SCMD_FLUSH, "QUIT\r\n");
3631 (void)smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
3632 ob->command_timeout);
3633 (void)close(inblock.sock);
3634 }
3635
3636
3637
3638 /*************************************************
3639 * Prepare addresses for delivery *
3640 *************************************************/
3641
3642 /* This function is called to flush out error settings from previous delivery
3643 attempts to other hosts. It also records whether we got here via an MX record
3644 or not in the more_errno field of the address. We are interested only in
3645 addresses that are still marked DEFER - others may have got delivered to a
3646 previously considered IP address. Set their status to PENDING_DEFER to indicate
3647 which ones are relevant this time.
3648
3649 Arguments:
3650 addrlist the list of addresses
3651 host the host we are delivering to
3652
3653 Returns: the first address for this delivery
3654 */
3655
3656 static address_item *
3657 prepare_addresses(address_item *addrlist, host_item *host)
3658 {
3659 address_item *first_addr = NULL;
3660 address_item *addr;
3661 for (addr = addrlist; addr; addr = addr->next)
3662 if (addr->transport_return == DEFER)
3663 {
3664 if (!first_addr) first_addr = addr;
3665 addr->transport_return = PENDING_DEFER;
3666 addr->basic_errno = 0;
3667 addr->more_errno = (host->mx >= 0)? 'M' : 'A';
3668 addr->message = NULL;
3669 #ifdef SUPPORT_TLS
3670 addr->cipher = NULL;
3671 addr->ourcert = NULL;
3672 addr->peercert = NULL;
3673 addr->peerdn = NULL;
3674 addr->ocsp = OCSP_NOT_REQ;
3675 #endif
3676 #ifdef EXPERIMENTAL_DSN_INFO
3677 addr->smtp_greeting = NULL;
3678 addr->helo_response = NULL;
3679 #endif
3680 }
3681 return first_addr;
3682 }
3683
3684
3685
3686 /*************************************************
3687 * Main entry point *
3688 *************************************************/
3689
3690 /* See local README for interface details. As this is a remote transport, it is
3691 given a chain of addresses to be delivered in one connection, if possible. It
3692 always returns TRUE, indicating that each address has its own independent
3693 status set, except if there is a setting up problem, in which case it returns
3694 FALSE. */
3695
3696 BOOL
3697 smtp_transport_entry(
3698 transport_instance *tblock, /* data for this instantiation */
3699 address_item *addrlist) /* addresses we are working on */
3700 {
3701 int cutoff_retry;
3702 int defport;
3703 int hosts_defer = 0;
3704 int hosts_fail = 0;
3705 int hosts_looked_up = 0;
3706 int hosts_retry = 0;
3707 int hosts_serial = 0;
3708 int hosts_total = 0;
3709 int total_hosts_tried = 0;
3710 address_item *addr;
3711 BOOL expired = TRUE;
3712 uschar *expanded_hosts = NULL;
3713 uschar *pistring;
3714 uschar *tid = string_sprintf("%s transport", tblock->name);
3715 smtp_transport_options_block *ob =
3716 (smtp_transport_options_block *)(tblock->options_block);
3717 host_item *hostlist = addrlist->host_list;
3718 host_item *host = NULL;
3719
3720 DEBUG(D_transport)
3721 {
3722 debug_printf("%s transport entered\n", tblock->name);
3723 for (addr = addrlist; addr; addr = addr->next)
3724 debug_printf(" %s\n", addr->address);
3725 if (hostlist)
3726 {
3727 debug_printf("hostlist:\n");
3728 for (host = hostlist; host; host = host->next)
3729 debug_printf(" %s:%d\n", host->name, host->port);
3730 }
3731 if (continue_hostname)
3732 debug_printf("already connected to %s [%s] (on fd %d)\n",
3733 continue_hostname, continue_host_address,
3734 cutthrough.fd >= 0 ? cutthrough.fd : 0);
3735 }
3736
3737 /* Set the flag requesting that these hosts be added to the waiting
3738 database if the delivery fails temporarily or if we are running with
3739 queue_smtp or a 2-stage queue run. This gets unset for certain
3740 kinds of error, typically those that are specific to the message. */
3741
3742 update_waiting = TRUE;
3743
3744 /* If a host list is not defined for the addresses - they must all have the
3745 same one in order to be passed to a single transport - or if the transport has
3746 a host list with hosts_override set, use the host list supplied with the
3747 transport. It is an error for this not to exist. */
3748
3749 if (!hostlist || (ob->hosts_override && ob->hosts))
3750 {
3751 if (!ob->hosts)
3752 {
3753 addrlist->message = string_sprintf("%s transport called with no hosts set",
3754 tblock->name);
3755 addrlist->transport_return = PANIC;
3756 return FALSE; /* Only top address has status */
3757 }
3758
3759 DEBUG(D_transport) debug_printf("using the transport's hosts: %s\n",
3760 ob->hosts);
3761
3762 /* If the transport's host list contains no '$' characters, and we are not
3763 randomizing, it is fixed and therefore a chain of hosts can be built once
3764 and for all, and remembered for subsequent use by other calls to this
3765 transport. If, on the other hand, the host list does contain '$', or we are
3766 randomizing its order, we have to rebuild it each time. In the fixed case,
3767 as the hosts string will never be used again, it doesn't matter that we
3768 replace all the : characters with zeros. */
3769
3770 if (!ob->hostlist)
3771 {
3772 uschar *s = ob->hosts;
3773
3774 if (Ustrchr(s, '$') != NULL)
3775 {
3776 if (!(expanded_hosts = expand_string(s)))
3777 {
3778 addrlist->message = string_sprintf("failed to expand list of hosts "
3779 "\"%s\" in %s transport: %s", s, tblock->name, expand_string_message);
3780 addrlist->transport_return = search_find_defer ? DEFER : PANIC;
3781 return FALSE; /* Only top address has status */
3782 }
3783 DEBUG(D_transport) debug_printf("expanded list of hosts \"%s\" to "
3784 "\"%s\"\n", s, expanded_hosts);
3785 s = expanded_hosts;
3786 }
3787 else
3788 if (ob->hosts_randomize) s = expanded_hosts = string_copy(s);
3789
3790 host_build_hostlist(&hostlist, s, ob->hosts_randomize);
3791
3792 /* Check that the expansion yielded something useful. */
3793 if (!hostlist)
3794 {
3795 addrlist->message =
3796 string_sprintf("%s transport has empty hosts setting", tblock->name);
3797 addrlist->transport_return = PANIC;
3798 return FALSE; /* Only top address has status */
3799 }
3800
3801 /* If there was no expansion of hosts, save the host list for
3802 next time. */
3803
3804 if (!expanded_hosts) ob->hostlist = hostlist;
3805 }
3806
3807 /* This is not the first time this transport has been run in this delivery;
3808 the host list was built previously. */
3809
3810 else
3811 hostlist = ob->hostlist;
3812 }
3813
3814 /* The host list was supplied with the address. If hosts_randomize is set, we
3815 must sort it into a random order if it did not come from MX records and has not
3816 already been randomized (but don't bother if continuing down an existing
3817 connection). */
3818
3819 else if (ob->hosts_randomize && hostlist->mx == MX_NONE && !continue_hostname)
3820 {
3821 host_item *newlist = NULL;
3822 while (hostlist)
3823 {
3824 host_item *h = hostlist;
3825 hostlist = hostlist->next;
3826
3827 h->sort_key = random_number(100);
3828
3829 if (!newlist)
3830 {
3831 h->next = NULL;
3832 newlist = h;
3833 }
3834 else if (h->sort_key < newlist->sort_key)
3835 {
3836 h->next = newlist;
3837 newlist = h;
3838 }
3839 else
3840 {
3841 host_item *hh = newlist;
3842 while (hh->next)
3843 {
3844 if (h->sort_key < hh->next->sort_key) break;
3845 hh = hh->next;
3846 }
3847 h->next = hh->next;
3848 hh->next = h;
3849 }
3850 }
3851
3852 hostlist = addrlist->host_list = newlist;
3853 }
3854
3855 /* Sort out the default port. */
3856
3857 if (!smtp_get_port(ob->port, addrlist, &defport, tid)) return FALSE;
3858
3859 /* For each host-plus-IP-address on the list:
3860
3861 . If this is a continued delivery and the host isn't the one with the
3862 current connection, skip.
3863
3864 . If the status is unusable (i.e. previously failed or retry checked), skip.
3865
3866 . If no IP address set, get the address, either by turning the name into
3867 an address, calling gethostbyname if gethostbyname is on, or by calling
3868 the DNS. The DNS may yield multiple addresses, in which case insert the
3869 extra ones into the list.
3870
3871 . Get the retry data if not previously obtained for this address and set the
3872 field which remembers the state of this address. Skip if the retry time is
3873 not reached. If not, remember whether retry data was found. The retry string
3874 contains both the name and the IP address.
3875
3876 . Scan the list of addresses and mark those whose status is DEFER as
3877 PENDING_DEFER. These are the only ones that will be processed in this cycle
3878 of the hosts loop.
3879
3880 . Make a delivery attempt - addresses marked PENDING_DEFER will be tried.
3881 Some addresses may be successfully delivered, others may fail, and yet
3882 others may get temporary errors and so get marked DEFER.
3883
3884 . The return from the delivery attempt is OK if a connection was made and a
3885 valid SMTP dialogue was completed. Otherwise it is DEFER.
3886
3887 . If OK, add a "remove" retry item for this host/IPaddress, if any.
3888
3889 . If fail to connect, or other defer state, add a retry item.
3890
3891 . If there are any addresses whose status is still DEFER, carry on to the
3892 next host/IPaddress, unless we have tried the number of hosts given
3893 by hosts_max_try or hosts_max_try_hardlimit; otherwise return. Note that
3894 there is some fancy logic for hosts_max_try that means its limit can be
3895 overstepped in some circumstances.
3896
3897 If we get to the end of the list, all hosts have deferred at least one address,
3898 or not reached their retry times. If delay_after_cutoff is unset, it requests a
3899 delivery attempt to those hosts whose last try was before the arrival time of
3900 the current message. To cope with this, we have to go round the loop a second
3901 time. After that, set the status and error data for any addresses that haven't
3902 had it set already. */
3903
3904 for (cutoff_retry = 0;
3905 expired && cutoff_retry < (ob->delay_after_cutoff ? 1 : 2);
3906 cutoff_retry++)
3907 {
3908 host_item *nexthost = NULL;
3909 int unexpired_hosts_tried = 0;
3910
3911 for (host = hostlist;
3912 host
3913 && unexpired_hosts_tried < ob->hosts_max_try
3914 && total_hosts_tried < ob->hosts_max_try_hardlimit;
3915 host = nexthost)
3916 {
3917 int rc;
3918 int host_af;
3919 uschar *rs;
3920 BOOL host_is_expired = FALSE;
3921 BOOL message_defer = FALSE;
3922 BOOL some_deferred = FALSE;
3923 address_item *first_addr = NULL;
3924 uschar *interface = NULL;
3925 uschar *retry_host_key = NULL;
3926 uschar *retry_message_key = NULL;
3927 uschar *serialize_key = NULL;
3928
3929 /* Default next host is next host. :-) But this can vary if the
3930 hosts_max_try limit is hit (see below). It may also be reset if a host
3931 address is looked up here (in case the host was multihomed). */
3932
3933 nexthost = host->next;
3934
3935 /* If the address hasn't yet been obtained from the host name, look it up
3936 now, unless the host is already marked as unusable. If it is marked as
3937 unusable, it means that the router was unable to find its IP address (in
3938 the DNS or wherever) OR we are in the 2nd time round the cutoff loop, and
3939 the lookup failed last time. We don't get this far if *all* MX records
3940 point to non-existent hosts; that is treated as a hard error.
3941
3942 We can just skip this host entirely. When the hosts came from the router,
3943 the address will timeout based on the other host(s); when the address is
3944 looked up below, there is an explicit retry record added.
3945
3946 Note that we mustn't skip unusable hosts if the address is not unset; they
3947 may be needed as expired hosts on the 2nd time round the cutoff loop. */
3948
3949 if (!host->address)
3950 {
3951 int new_port, flags;
3952 host_item *hh;
3953
3954 if (host->status >= hstatus_unusable)
3955 {
3956 DEBUG(D_transport) debug_printf("%s has no address and is unusable - skipping\n",
3957 host->name);
3958 continue;
3959 }
3960
3961 DEBUG(D_transport) debug_printf("getting address for %s\n", host->name);
3962
3963 /* The host name is permitted to have an attached port. Find it, and
3964 strip it from the name. Just remember it for now. */
3965
3966 new_port = host_item_get_port(host);
3967
3968 /* Count hosts looked up */
3969
3970 hosts_looked_up++;
3971
3972 /* Find by name if so configured, or if it's an IP address. We don't
3973 just copy the IP address, because we need the test-for-local to happen. */
3974
3975 flags = HOST_FIND_BY_A;
3976 if (ob->dns_qualify_single) flags |= HOST_FIND_QUALIFY_SINGLE;
3977 if (ob->dns_search_parents) flags |= HOST_FIND_SEARCH_PARENTS;
3978
3979 if (ob->gethostbyname || string_is_ip_address(host->name, NULL) != 0)
3980 rc = host_find_byname(host, NULL, flags, NULL, TRUE);
3981 else
3982 rc = host_find_bydns(host, NULL, flags, NULL, NULL, NULL,
3983 &ob->dnssec, /* domains for request/require */
3984 NULL, NULL);
3985
3986 /* Update the host (and any additional blocks, resulting from
3987 multihoming) with a host-specific port, if any. */
3988
3989 for (hh = host; hh != nexthost; hh = hh->next) hh->port = new_port;
3990
3991 /* Failure to find the host at this time (usually DNS temporary failure)
3992 is really a kind of routing failure rather than a transport failure.
3993 Therefore we add a retry item of the routing kind, not to stop us trying
3994 to look this name up here again, but to ensure the address gets timed
3995 out if the failures go on long enough. A complete failure at this point
3996 commonly points to a configuration error, but the best action is still
3997 to carry on for the next host. */
3998
3999 if (rc == HOST_FIND_AGAIN || rc == HOST_FIND_SECURITY || rc == HOST_FIND_FAILED)
4000 {
4001 retry_add_item(addrlist, string_sprintf("R:%s", host->name), 0);
4002 expired = FALSE;
4003 if (rc == HOST_FIND_AGAIN) hosts_defer++; else hosts_fail++;
4004 DEBUG(D_transport) debug_printf("rc = %s for %s\n", (rc == HOST_FIND_AGAIN)?
4005 "HOST_FIND_AGAIN" : "HOST_FIND_FAILED", host->name);
4006 host->status = hstatus_unusable;
4007
4008 for (addr = addrlist; addr; addr = addr->next)
4009 {
4010 if (addr->transport_return != DEFER) continue;
4011 addr->basic_errno = ERRNO_UNKNOWNHOST;
4012 addr->message = string_sprintf(
4013 rc == HOST_FIND_SECURITY
4014 ? "lookup of IP address for %s was insecure"
4015 : "failed to lookup IP address for %s",
4016 host->name);
4017 }
4018 continue;
4019 }
4020
4021 /* If the host is actually the local host, we may have a problem, or
4022 there may be some cunning configuration going on. In the problem case,
4023 log things and give up. The default transport status is already DEFER. */
4024
4025 if (rc == HOST_FOUND_LOCAL && !ob->allow_localhost)
4026 {
4027 for (addr = addrlist; addr; addr = addr->next)
4028 {
4029 addr->basic_errno = 0;
4030 addr->message = string_sprintf("%s transport found host %s to be "
4031 "local", tblock->name, host->name);
4032 }
4033 goto END_TRANSPORT;
4034 }
4035 } /* End of block for IP address lookup */
4036
4037 /* If this is a continued delivery, we are interested only in the host
4038 which matches the name of the existing open channel. The check is put
4039 here after the local host lookup, in case the name gets expanded as a
4040 result of the lookup. Set expired FALSE, to save the outer loop executing
4041 twice. */
4042
4043 if ( continue_hostname
4044 && ( Ustrcmp(continue_hostname, host->name) != 0
4045 || Ustrcmp(continue_host_address, host->address) != 0
4046 ) )
4047 {
4048 expired = FALSE;
4049 continue; /* With next host */
4050 }
4051
4052 /* Reset the default next host in case a multihomed host whose addresses
4053 are not looked up till just above added to the host list. */
4054
4055 nexthost = host->next;
4056
4057 /* If queue_smtp is set (-odqs or the first part of a 2-stage run), or the
4058 domain is in queue_smtp_domains, we don't actually want to attempt any
4059 deliveries. When doing a queue run, queue_smtp_domains is always unset. If
4060 there is a lookup defer in queue_smtp_domains, proceed as if the domain
4061 were not in it. We don't want to hold up all SMTP deliveries! Except when
4062 doing a two-stage queue run, don't do this if forcing. */
4063
4064 if ((!deliver_force || queue_2stage) && (queue_smtp ||
4065 match_isinlist(addrlist->domain,
4066 (const uschar **)&queue_smtp_domains, 0,
4067 &domainlist_anchor, NULL, MCL_DOMAIN, TRUE, NULL) == OK))
4068 {
4069 expired = FALSE;
4070 for (addr = addrlist; addr; addr = addr->next)
4071 if (addr->transport_return == DEFER)
4072 addr->message = US"domain matches queue_smtp_domains, or -odqs set";
4073 continue; /* With next host */
4074 }
4075
4076 /* Count hosts being considered - purely for an intelligent comment
4077 if none are usable. */
4078
4079 hosts_total++;
4080
4081 /* Set $host and $host address now in case they are needed for the
4082 interface expansion or the serialize_hosts check; they remain set if an
4083 actual delivery happens. */
4084
4085 deliver_host = host->name;
4086 deliver_host_address = host->address;
4087 lookup_dnssec_authenticated = host->dnssec == DS_YES ? US"yes"
4088 : host->dnssec == DS_NO ? US"no"
4089 : US"";
4090
4091 /* Set up a string for adding to the retry key if the port number is not
4092 the standard SMTP port. A host may have its own port setting that overrides
4093 the default. */
4094
4095 pistring = string_sprintf(":%d", host->port == PORT_NONE
4096 ? defport : host->port);
4097 if (Ustrcmp(pistring, ":25") == 0) pistring = US"";
4098
4099 /* Select IPv4 or IPv6, and choose an outgoing interface. If the interface
4100 string is set, even if constant (as different transports can have different
4101 constant settings), we must add it to the key that is used for retries,
4102 because connections to the same host from a different interface should be
4103 treated separately. */
4104
4105 host_af = Ustrchr(host->address, ':') == NULL ? AF_INET : AF_INET6;
4106 if ((rs = ob->interface) && *rs)
4107 {
4108 if (!smtp_get_interface(rs, host_af, addrlist, &interface, tid))
4109 return FALSE;
4110 pistring = string_sprintf("%s/%s", pistring, interface);
4111 }
4112
4113 /* The first time round the outer loop, check the status of the host by
4114 inspecting the retry data. The second time round, we are interested only
4115 in expired hosts that haven't been tried since this message arrived. */
4116
4117 if (cutoff_retry == 0)
4118 {
4119 BOOL incl_ip;
4120 /* Ensure the status of the address is set by checking retry data if
4121 necessary. There may be host-specific retry data (applicable to all
4122 messages) and also data for retries of a specific message at this host.
4123 If either of these retry records are actually read, the keys used are
4124 returned to save recomputing them later. */
4125
4126 if (exp_bool(addrlist, US"transport", tblock->name, D_transport,
4127 US"retry_include_ip_address", ob->retry_include_ip_address,
4128 ob->expand_retry_include_ip_address, &incl_ip) != OK)
4129 continue; /* with next host */
4130
4131 host_is_expired = retry_check_address(addrlist->domain, host, pistring,
4132 incl_ip, &retry_host_key, &retry_message_key);
4133
4134 DEBUG(D_transport) debug_printf("%s [%s]%s retry-status = %s\n", host->name,
4135 (host->address == NULL)? US"" : host->address, pistring,
4136 (host->status == hstatus_usable)? "usable" :
4137 (host->status == hstatus_unusable)? "unusable" :
4138 (host->status == hstatus_unusable_expired)? "unusable (expired)" : "?");
4139
4140 /* Skip this address if not usable at this time, noting if it wasn't
4141 actually expired, both locally and in the address. */
4142
4143 switch (host->status)
4144 {
4145 case hstatus_unusable:
4146 expired = FALSE;
4147 setflag(addrlist, af_retry_skipped);
4148 /* Fall through */
4149
4150 case hstatus_unusable_expired:
4151 switch (host->why)
4152 {
4153 case hwhy_retry: hosts_retry++; break;
4154 case hwhy_failed: hosts_fail++; break;
4155 case hwhy_insecure:
4156 case hwhy_deferred: hosts_defer++; break;
4157 }
4158
4159 /* If there was a retry message key, implying that previously there
4160 was a message-specific defer, we don't want to update the list of
4161 messages waiting for these hosts. */
4162
4163 if (retry_message_key) update_waiting = FALSE;
4164 continue; /* With the next host or IP address */
4165 }
4166 }
4167
4168 /* Second time round the loop: if the address is set but expired, and
4169 the message is newer than the last try, let it through. */
4170
4171 else
4172 {
4173 if ( !host->address
4174 || host->status != hstatus_unusable_expired
4175 || host->last_try > received_time.tv_sec)
4176 continue;
4177 DEBUG(D_transport) debug_printf("trying expired host %s [%s]%s\n",
4178 host->name, host->address, pistring);
4179 host_is_expired = TRUE;
4180 }
4181
4182 /* Setting "expired=FALSE" doesn't actually mean not all hosts are expired;
4183 it remains TRUE only if all hosts are expired and none are actually tried.
4184 */
4185
4186 expired = FALSE;
4187
4188 /* If this host is listed as one to which access must be serialized,
4189 see if another Exim process has a connection to it, and if so, skip
4190 this host. If not, update the database to record our connection to it
4191 and remember this for later deletion. Do not do any of this if we are
4192 sending the message down a pre-existing connection. */
4193
4194 if ( !continue_hostname
4195 && verify_check_given_host(&ob->serialize_hosts, host) == OK)
4196 {
4197 serialize_key = string_sprintf("host-serialize-%s", host->name);
4198 if (!enq_start(serialize_key, 1))
4199 {
4200 DEBUG(D_transport)
4201 debug_printf("skipping host %s because another Exim process "
4202 "is connected to it\n", host->name);
4203 hosts_serial++;
4204 continue;
4205 }
4206 }
4207
4208 /* OK, we have an IP address that is not waiting for its retry time to
4209 arrive (it might be expired) OR (second time round the loop) we have an
4210 expired host that hasn't been tried since the message arrived. Have a go
4211 at delivering the message to it. First prepare the addresses by flushing
4212 out the result of previous attempts, and finding the first address that
4213 is still to be delivered. */
4214
4215 first_addr = prepare_addresses(addrlist, host);
4216
4217 DEBUG(D_transport) debug_printf("delivering %s to %s [%s] (%s%s)\n",
4218 message_id, host->name, host->address, addrlist->address,
4219 addrlist->next ? ", ..." : "");
4220
4221 set_process_info("delivering %s to %s [%s] (%s%s)",
4222 message_id, host->name, host->address, addrlist->address,
4223 addrlist->next ? ", ..." : "");
4224
4225 /* This is not for real; don't do the delivery. If there are
4226 any remaining hosts, list them. */
4227
4228 if (dont_deliver)
4229 {
4230 host_item *host2;
4231 set_errno_nohost(addrlist, 0, NULL, OK, FALSE);
4232 for (addr = addrlist; addr; addr = addr->next)
4233 {
4234 addr->host_used = host;
4235 addr->special_action = '*';
4236 addr->message = US"delivery bypassed by -N option";
4237 }
4238 DEBUG(D_transport)
4239 {
4240 debug_printf("*** delivery by %s transport bypassed by -N option\n"
4241 "*** host and remaining hosts:\n", tblock->name);
4242 for (host2 = host; host2; host2 = host2->next)
4243 debug_printf(" %s [%s]\n", host2->name,
4244 host2->address ? host2->address : US"unset");
4245 }
4246 rc = OK;
4247 }
4248
4249 /* This is for real. If the host is expired, we don't count it for
4250 hosts_max_retry. This ensures that all hosts must expire before an address
4251 is timed out, unless hosts_max_try_hardlimit (which protects against
4252 lunatic DNS configurations) is reached.
4253
4254 If the host is not expired and we are about to hit the hosts_max_retry
4255 limit, check to see if there is a subsequent hosts with a different MX
4256 value. If so, make that the next host, and don't count this one. This is a
4257 heuristic to make sure that different MXs do get tried. With a normal kind
4258 of retry rule, they would get tried anyway when the earlier hosts were
4259 delayed, but if the domain has a "retry every time" type of rule - as is
4260 often used for the the very large ISPs, that won't happen. */
4261
4262 else
4263 {
4264 host_item * thost;
4265 /* Make a copy of the host if it is local to this invocation
4266 of the transport. */
4267
4268 if (expanded_hosts)
4269 {
4270 thost = store_get(sizeof(host_item));
4271 *thost = *host;
4272 thost->name = string_copy(host->name);
4273 thost->address = string_copy(host->address);
4274 }
4275 else
4276 thost = host;
4277
4278 if (!host_is_expired && ++unexpired_hosts_tried >= ob->hosts_max_try)
4279 {
4280 host_item *h;
4281 DEBUG(D_transport)
4282 debug_printf("hosts_max_try limit reached with this host\n");
4283 for (h = host; h; h = h->next) if (h->mx != host->mx)
4284 {
4285 nexthost = h;
4286 unexpired_hosts_tried--;
4287 DEBUG(D_transport) debug_printf("however, a higher MX host exists "
4288 "and will be tried\n");
4289 break;
4290 }
4291 }
4292
4293 /* Attempt the delivery. */
4294
4295 total_hosts_tried++;
4296 rc = smtp_deliver(addrlist, thost, host_af, defport, interface, tblock,
4297 &message_defer, FALSE);
4298
4299 /* Yield is one of:
4300 OK => connection made, each address contains its result;
4301 message_defer is set for message-specific defers (when all
4302 recipients are marked defer)
4303 DEFER => there was a non-message-specific delivery problem;
4304 ERROR => there was a problem setting up the arguments for a filter,
4305 or there was a problem with expanding added headers
4306 */
4307
4308 /* If the result is not OK, there was a non-message-specific problem.
4309 If the result is DEFER, we need to write to the logs saying what happened
4310 for this particular host, except in the case of authentication and TLS
4311 failures, where the log has already been written. If all hosts defer a
4312 general message is written at the end. */
4313
4314 if (rc == DEFER && first_addr->basic_errno != ERRNO_AUTHFAIL
4315 && first_addr->basic_errno != ERRNO_TLSFAILURE)
4316 write_logs(first_addr, host);
4317
4318 #ifndef DISABLE_EVENT
4319 if (rc == DEFER)
4320 deferred_event_raise(first_addr, host);
4321 #endif
4322
4323 /* If STARTTLS was accepted, but there was a failure in setting up the
4324 TLS session (usually a certificate screwup), and the host is not in
4325 hosts_require_tls, and tls_tempfail_tryclear is true, try again, with
4326 TLS forcibly turned off. We have to start from scratch with a new SMTP
4327 connection. That's why the retry is done from here, not from within
4328 smtp_deliver(). [Rejections of STARTTLS itself don't screw up the
4329 session, so the in-clear transmission after those errors, if permitted,
4330 happens inside smtp_deliver().] */
4331
4332 #ifdef SUPPORT_TLS
4333 if ( rc == DEFER
4334 && first_addr->basic_errno == ERRNO_TLSFAILURE
4335 && ob->tls_tempfail_tryclear
4336 && verify_check_given_host(&ob->hosts_require_tls, host) != OK
4337 )
4338 {
4339 log_write(0, LOG_MAIN,
4340 "%s: delivering unencrypted to H=%s [%s] (not in hosts_require_tls)",
4341 first_addr->message, host->name, host->address);
4342 first_addr = prepare_addresses(addrlist, host);
4343 rc = smtp_deliver(addrlist, thost, host_af, defport, interface, tblock,
4344 &message_defer, TRUE);
4345 if (rc == DEFER && first_addr->basic_errno != ERRNO_AUTHFAIL)
4346 write_logs(first_addr, host);
4347 # ifndef DISABLE_EVENT
4348 if (rc == DEFER)
4349 deferred_event_raise(first_addr, host);
4350 # endif
4351 }
4352 #endif /*SUPPORT_TLS*/
4353 }
4354
4355 /* Delivery attempt finished */
4356
4357 rs = rc == OK ? US"OK"
4358 : rc == DEFER ? US"DEFER"
4359 : rc == ERROR ? US"ERROR"
4360 : US"?";
4361
4362 set_process_info("delivering %s: just tried %s [%s] for %s%s: result %s",
4363 message_id, host->name, host->address, addrlist->address,
4364 addrlist->next ? " (& others)" : "", rs);
4365
4366 /* Release serialization if set up */
4367
4368 if (serialize_key) enq_end(serialize_key);
4369
4370 /* If the result is DEFER, or if a host retry record is known to exist, we
4371 need to add an item to the retry chain for updating the retry database
4372 at the end of delivery. We only need to add the item to the top address,
4373 of course. Also, if DEFER, we mark the IP address unusable so as to skip it
4374 for any other delivery attempts using the same address. (It is copied into
4375 the unusable tree at the outer level, so even if different address blocks
4376 contain the same address, it still won't get tried again.) */
4377
4378 if (rc == DEFER || retry_host_key)
4379 {
4380 int delete_flag = rc != DEFER ? rf_delete : 0;
4381 if (!retry_host_key)
4382 {
4383 BOOL incl_ip;
4384 if (exp_bool(addrlist, US"transport", tblock->name, D_transport,
4385 US"retry_include_ip_address", ob->retry_include_ip_address,
4386 ob->expand_retry_include_ip_address, &incl_ip) != OK)
4387 incl_ip = TRUE; /* error; use most-specific retry record */
4388
4389 retry_host_key = incl_ip
4390 ? string_sprintf("T:%S:%s%s", host->name, host->address, pistring)
4391 : string_sprintf("T:%S%s", host->name, pistring);
4392 }
4393
4394 /* If a delivery of another message over an existing SMTP connection
4395 yields DEFER, we do NOT set up retry data for the host. This covers the
4396 case when there are delays in routing the addresses in the second message
4397 that are so long that the server times out. This is alleviated by not
4398 routing addresses that previously had routing defers when handling an
4399 existing connection, but even so, this case may occur (e.g. if a
4400 previously happily routed address starts giving routing defers). If the
4401 host is genuinely down, another non-continued message delivery will
4402 notice it soon enough. */
4403
4404 if (delete_flag != 0 || !continue_hostname)
4405 retry_add_item(first_addr, retry_host_key, rf_host | delete_flag);
4406
4407 /* We may have tried an expired host, if its retry time has come; ensure
4408 the status reflects the expiry for the benefit of any other addresses. */
4409
4410 if (rc == DEFER)
4411 {
4412 host->status = host_is_expired
4413 ? hstatus_unusable_expired : hstatus_unusable;
4414 host->why = hwhy_deferred;
4415 }
4416 }
4417
4418 /* If message_defer is set (host was OK, but every recipient got deferred
4419 because of some message-specific problem), or if that had happened
4420 previously so that a message retry key exists, add an appropriate item
4421 to the retry chain. Note that if there was a message defer but now there is
4422 a host defer, the message defer record gets deleted. That seems perfectly
4423 reasonable. Also, stop the message from being remembered as waiting
4424 for specific hosts. */
4425
4426 if (message_defer || retry_message_key)
4427 {
4428 int delete_flag = message_defer ? 0 : rf_delete;
4429 if (!retry_message_key)
4430 {
4431 BOOL incl_ip;
4432 if (exp_bool(addrlist, US"transport", tblock->name, D_transport,
4433 US"retry_include_ip_address", ob->retry_include_ip_address,
4434 ob->expand_retry_include_ip_address, &incl_ip) != OK)
4435 incl_ip = TRUE; /* error; use most-specific retry record */
4436
4437 retry_message_key = incl_ip
4438 ? string_sprintf("T:%S:%s%s:%s", host->name, host->address, pistring,
4439 message_id)
4440 : string_sprintf("T:%S%s:%s", host->name, pistring, message_id);
4441 }
4442 retry_add_item(addrlist, retry_message_key,
4443 rf_message | rf_host | delete_flag);
4444 update_waiting = FALSE;
4445 }
4446
4447 /* Any return other than DEFER (that is, OK or ERROR) means that the
4448 addresses have got their final statuses filled in for this host. In the OK
4449 case, see if any of them are deferred. */
4450
4451 if (rc == OK)
4452 for (addr = addrlist; addr; addr = addr->next)
4453 if (addr->transport_return == DEFER)
4454 {
4455 some_deferred = TRUE;
4456 break;
4457 }
4458
4459 /* If no addresses deferred or the result was ERROR, return. We do this for
4460 ERROR because a failing filter set-up or add_headers expansion is likely to
4461 fail for any host we try. */
4462
4463 if (rc == ERROR || (rc == OK && !some_deferred))
4464 {
4465 DEBUG(D_transport) debug_printf("Leaving %s transport\n", tblock->name);
4466 return TRUE; /* Each address has its status */
4467 }
4468
4469 /* If the result was DEFER or some individual addresses deferred, let
4470 the loop run to try other hosts with the deferred addresses, except for the
4471 case when we were trying to deliver down an existing channel and failed.
4472 Don't try any other hosts in this case. */
4473
4474 if (continue_hostname) break;
4475
4476 /* If the whole delivery, or some individual addresses, were deferred and
4477 there are more hosts that could be tried, do not count this host towards
4478 the hosts_max_try limit if the age of the message is greater than the
4479 maximum retry time for this host. This means we may try try all hosts,
4480 ignoring the limit, when messages have been around for some time. This is
4481 important because if we don't try all hosts, the address will never time
4482 out. NOTE: this does not apply to hosts_max_try_hardlimit. */
4483
4484 if ((rc == DEFER || some_deferred) && nexthost)
4485 {
4486 BOOL timedout;
4487 retry_config *retry = retry_find_config(host->name, NULL, 0, 0);
4488
4489 if (retry && retry->rules)
4490 {
4491 retry_rule *last_rule;
4492 for (last_rule = retry->rules;
4493 last_rule->next;
4494 last_rule = last_rule->next);
4495 timedout = time(NULL) - received_time.tv_sec > last_rule->timeout;
4496 }
4497 else timedout = TRUE; /* No rule => timed out */
4498
4499 if (timedout)
4500 {
4501 unexpired_hosts_tried--;
4502 DEBUG(D_transport) debug_printf("temporary delivery error(s) override "
4503 "hosts_max_try (message older than host's retry time)\n");
4504 }
4505 }
4506 } /* End of loop for trying multiple hosts. */
4507
4508 /* This is the end of the loop that repeats iff expired is TRUE and
4509 ob->delay_after_cutoff is FALSE. The second time round we will
4510 try those hosts that haven't been tried since the message arrived. */
4511
4512 DEBUG(D_transport)
4513 {
4514 debug_printf("all IP addresses skipped or deferred at least one address\n");
4515 if (expired && !ob->delay_after_cutoff && cutoff_retry == 0)
4516 debug_printf("retrying IP addresses not tried since message arrived\n");
4517 }
4518 }
4519
4520
4521 /* Get here if all IP addresses are skipped or defer at least one address. In
4522 MUA wrapper mode, this will happen only for connection or other non-message-
4523 specific failures. Force the delivery status for all addresses to FAIL. */
4524
4525 if (mua_wrapper)
4526 {
4527 for (addr = addrlist; addr; addr = addr->next)
4528 addr->transport_return = FAIL;
4529 goto END_TRANSPORT;
4530 }
4531
4532 /* In the normal, non-wrapper case, add a standard message to each deferred
4533 address if there hasn't been an error, that is, if it hasn't actually been
4534 tried this time. The variable "expired" will be FALSE if any deliveries were
4535 actually tried, or if there was at least one host that was not expired. That
4536 is, it is TRUE only if no deliveries were tried and all hosts were expired. If
4537 a delivery has been tried, an error code will be set, and the failing of the
4538 message is handled by the retry code later.
4539
4540 If queue_smtp is set, or this transport was called to send a subsequent message
4541 down an existing TCP/IP connection, and something caused the host not to be
4542 found, we end up here, but can detect these cases and handle them specially. */
4543
4544 for (addr = addrlist; addr; addr = addr->next)
4545 {
4546 /* If host is not NULL, it means that we stopped processing the host list
4547 because of hosts_max_try or hosts_max_try_hardlimit. In the former case, this
4548 means we need to behave as if some hosts were skipped because their retry
4549 time had not come. Specifically, this prevents the address from timing out.
4550 However, if we have hit hosts_max_try_hardlimit, we want to behave as if all
4551 hosts were tried. */
4552
4553 if (host)
4554 if (total_hosts_tried >= ob->hosts_max_try_hardlimit)
4555 {
4556 DEBUG(D_transport)
4557 debug_printf("hosts_max_try_hardlimit reached: behave as if all "
4558 "hosts were tried\n");
4559 }
4560 else
4561 {
4562 DEBUG(D_transport)
4563 debug_printf("hosts_max_try limit caused some hosts to be skipped\n");
4564 setflag(addr, af_retry_skipped);
4565 }
4566
4567 if (queue_smtp) /* no deliveries attempted */
4568 {
4569 addr->transport_return = DEFER;
4570 addr->basic_errno = 0;
4571 addr->message = US"SMTP delivery explicitly queued";
4572 }
4573
4574 else if ( addr->transport_return == DEFER
4575 && (addr->basic_errno == ERRNO_UNKNOWNERROR || addr->basic_errno == 0)
4576 && !addr->message
4577 )
4578 {
4579 addr->basic_errno = ERRNO_HRETRY;
4580 if (continue_hostname)
4581 addr->message = US"no host found for existing SMTP connection";
4582 else if (expired)
4583 {
4584 setflag(addr, af_pass_message); /* This is not a security risk */
4585 addr->message = string_sprintf(
4586 "all hosts%s have been failing for a long time %s",
4587 addr->domain ? string_sprintf(" for '%s'", addr->domain) : US"",
4588 ob->delay_after_cutoff
4589 ? US"(and retry time not reached)"
4590 : US"and were last tried after this message arrived");
4591
4592 /* If we are already using fallback hosts, or there are no fallback hosts
4593 defined, convert the result to FAIL to cause a bounce. */
4594
4595 if (addr->host_list == addr->fallback_hosts || !addr->fallback_hosts)
4596 addr->transport_return = FAIL;
4597 }
4598 else
4599 {
4600 const char * s;
4601 if (hosts_retry == hosts_total)
4602 s = "retry time not reached for any host%s";
4603 else if (hosts_fail == hosts_total)
4604 s = "all host address lookups%s failed permanently";
4605 else if (hosts_defer == hosts_total)
4606 s = "all host address lookups%s failed temporarily";
4607 else if (hosts_serial == hosts_total)
4608 s = "connection limit reached for all hosts%s";
4609 else if (hosts_fail+hosts_defer == hosts_total)
4610 s = "all host address lookups%s failed";
4611 else
4612 s = "some host address lookups failed and retry time "
4613 "not reached for other hosts or connection limit reached%s";
4614
4615 addr->message = string_sprintf(s,
4616 addr->domain ? string_sprintf(" for '%s'", addr->domain) : US"");
4617 }
4618 }
4619 }
4620
4621 /* Update the database which keeps information about which messages are waiting
4622 for which hosts to become available. For some message-specific errors, the
4623 update_waiting flag is turned off because we don't want follow-on deliveries in
4624 those cases. If this transport instance is explicitly limited to one message
4625 per connection then follow-on deliveries are not possible and there's no need
4626 to create/update the per-transport wait-<transport_name> database. */
4627
4628 if (update_waiting && tblock->connection_max_messages != 1)
4629 transport_update_waiting(hostlist, tblock->name);
4630
4631 END_TRANSPORT:
4632
4633 DEBUG(D_transport) debug_printf("Leaving %s transport\n", tblock->name);
4634
4635 return TRUE; /* Each address has its status */
4636 }
4637
4638 #endif /*!MACRO_PREDEF*/
4639 /* vi: aw ai sw=2
4640 */
4641 /* End of transport/smtp.c */
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