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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 - 2018 */
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 #ifdef EXPERIMENTAL_ARC
28 { "arc_sign", opt_stringptr,
29 (void *)offsetof(smtp_transport_options_block, arc_sign) },
30 #endif
31 { "authenticated_sender", opt_stringptr,
32 (void *)offsetof(smtp_transport_options_block, authenticated_sender) },
33 { "authenticated_sender_force", opt_bool,
34 (void *)offsetof(smtp_transport_options_block, authenticated_sender_force) },
35 { "command_timeout", opt_time,
36 (void *)offsetof(smtp_transport_options_block, command_timeout) },
37 { "connect_timeout", opt_time,
38 (void *)offsetof(smtp_transport_options_block, connect_timeout) },
39 { "connection_max_messages", opt_int | opt_public,
40 (void *)offsetof(transport_instance, connection_max_messages) },
41 # ifdef SUPPORT_DANE
42 { "dane_require_tls_ciphers", opt_stringptr,
43 (void *)offsetof(smtp_transport_options_block, dane_require_tls_ciphers) },
44 # endif
45 { "data_timeout", opt_time,
46 (void *)offsetof(smtp_transport_options_block, data_timeout) },
47 { "delay_after_cutoff", opt_bool,
48 (void *)offsetof(smtp_transport_options_block, delay_after_cutoff) },
49 #ifndef DISABLE_DKIM
50 { "dkim_canon", opt_stringptr,
51 (void *)offsetof(smtp_transport_options_block, dkim.dkim_canon) },
52 { "dkim_domain", opt_stringptr,
53 (void *)offsetof(smtp_transport_options_block, dkim.dkim_domain) },
54 { "dkim_hash", opt_stringptr,
55 (void *)offsetof(smtp_transport_options_block, dkim.dkim_hash) },
56 { "dkim_identity", opt_stringptr,
57 (void *)offsetof(smtp_transport_options_block, dkim.dkim_identity) },
58 { "dkim_private_key", opt_stringptr,
59 (void *)offsetof(smtp_transport_options_block, dkim.dkim_private_key) },
60 { "dkim_selector", opt_stringptr,
61 (void *)offsetof(smtp_transport_options_block, dkim.dkim_selector) },
62 { "dkim_sign_headers", opt_stringptr,
63 (void *)offsetof(smtp_transport_options_block, dkim.dkim_sign_headers) },
64 { "dkim_strict", opt_stringptr,
65 (void *)offsetof(smtp_transport_options_block, dkim.dkim_strict) },
66 #endif
67 { "dns_qualify_single", opt_bool,
68 (void *)offsetof(smtp_transport_options_block, dns_qualify_single) },
69 { "dns_search_parents", opt_bool,
70 (void *)offsetof(smtp_transport_options_block, dns_search_parents) },
71 { "dnssec_request_domains", opt_stringptr,
72 (void *)offsetof(smtp_transport_options_block, dnssec.request) },
73 { "dnssec_require_domains", opt_stringptr,
74 (void *)offsetof(smtp_transport_options_block, dnssec.require) },
75 { "dscp", opt_stringptr,
76 (void *)offsetof(smtp_transport_options_block, dscp) },
77 { "fallback_hosts", opt_stringptr,
78 (void *)offsetof(smtp_transport_options_block, fallback_hosts) },
79 { "final_timeout", opt_time,
80 (void *)offsetof(smtp_transport_options_block, final_timeout) },
81 { "gethostbyname", opt_bool,
82 (void *)offsetof(smtp_transport_options_block, gethostbyname) },
83 { "helo_data", opt_stringptr,
84 (void *)offsetof(smtp_transport_options_block, helo_data) },
85 { "hosts", opt_stringptr,
86 (void *)offsetof(smtp_transport_options_block, hosts) },
87 { "hosts_avoid_esmtp", opt_stringptr,
88 (void *)offsetof(smtp_transport_options_block, hosts_avoid_esmtp) },
89 { "hosts_avoid_pipelining", opt_stringptr,
90 (void *)offsetof(smtp_transport_options_block, hosts_avoid_pipelining) },
91 #ifdef SUPPORT_TLS
92 { "hosts_avoid_tls", opt_stringptr,
93 (void *)offsetof(smtp_transport_options_block, hosts_avoid_tls) },
94 #endif
95 { "hosts_max_try", opt_int,
96 (void *)offsetof(smtp_transport_options_block, hosts_max_try) },
97 { "hosts_max_try_hardlimit", opt_int,
98 (void *)offsetof(smtp_transport_options_block, hosts_max_try_hardlimit) },
99 #ifdef SUPPORT_TLS
100 { "hosts_nopass_tls", opt_stringptr,
101 (void *)offsetof(smtp_transport_options_block, hosts_nopass_tls) },
102 { "hosts_noproxy_tls", opt_stringptr,
103 (void *)offsetof(smtp_transport_options_block, hosts_noproxy_tls) },
104 #endif
105 { "hosts_override", opt_bool,
106 (void *)offsetof(smtp_transport_options_block, hosts_override) },
107 { "hosts_randomize", opt_bool,
108 (void *)offsetof(smtp_transport_options_block, hosts_randomize) },
109 #if defined(SUPPORT_TLS) && !defined(DISABLE_OCSP)
110 { "hosts_request_ocsp", opt_stringptr,
111 (void *)offsetof(smtp_transport_options_block, hosts_request_ocsp) },
112 #endif
113 { "hosts_require_auth", opt_stringptr,
114 (void *)offsetof(smtp_transport_options_block, hosts_require_auth) },
115 #ifdef SUPPORT_TLS
116 # ifdef SUPPORT_DANE
117 { "hosts_require_dane", opt_stringptr,
118 (void *)offsetof(smtp_transport_options_block, hosts_require_dane) },
119 # endif
120 # ifndef DISABLE_OCSP
121 { "hosts_require_ocsp", opt_stringptr,
122 (void *)offsetof(smtp_transport_options_block, hosts_require_ocsp) },
123 # endif
124 { "hosts_require_tls", opt_stringptr,
125 (void *)offsetof(smtp_transport_options_block, hosts_require_tls) },
126 #endif
127 { "hosts_try_auth", opt_stringptr,
128 (void *)offsetof(smtp_transport_options_block, hosts_try_auth) },
129 { "hosts_try_chunking", opt_stringptr,
130 (void *)offsetof(smtp_transport_options_block, hosts_try_chunking) },
131 #if defined(SUPPORT_TLS) && defined(SUPPORT_DANE)
132 { "hosts_try_dane", opt_stringptr,
133 (void *)offsetof(smtp_transport_options_block, hosts_try_dane) },
134 #endif
135 { "hosts_try_fastopen", opt_stringptr,
136 (void *)offsetof(smtp_transport_options_block, hosts_try_fastopen) },
137 #ifndef DISABLE_PRDR
138 { "hosts_try_prdr", opt_stringptr,
139 (void *)offsetof(smtp_transport_options_block, hosts_try_prdr) },
140 #endif
141 #ifdef SUPPORT_TLS
142 { "hosts_verify_avoid_tls", opt_stringptr,
143 (void *)offsetof(smtp_transport_options_block, hosts_verify_avoid_tls) },
144 #endif
145 { "interface", opt_stringptr,
146 (void *)offsetof(smtp_transport_options_block, interface) },
147 { "keepalive", opt_bool,
148 (void *)offsetof(smtp_transport_options_block, keepalive) },
149 { "lmtp_ignore_quota", opt_bool,
150 (void *)offsetof(smtp_transport_options_block, lmtp_ignore_quota) },
151 { "max_rcpt", opt_int | opt_public,
152 (void *)offsetof(transport_instance, max_addresses) },
153 { "multi_domain", opt_expand_bool | opt_public,
154 (void *)offsetof(transport_instance, multi_domain) },
155 { "port", opt_stringptr,
156 (void *)offsetof(smtp_transport_options_block, port) },
157 { "protocol", opt_stringptr,
158 (void *)offsetof(smtp_transport_options_block, protocol) },
159 { "retry_include_ip_address", opt_expand_bool,
160 (void *)offsetof(smtp_transport_options_block, retry_include_ip_address) },
161 { "serialize_hosts", opt_stringptr,
162 (void *)offsetof(smtp_transport_options_block, serialize_hosts) },
163 { "size_addition", opt_int,
164 (void *)offsetof(smtp_transport_options_block, size_addition) }
165 #ifdef SUPPORT_SOCKS
166 ,{ "socks_proxy", opt_stringptr,
167 (void *)offsetof(smtp_transport_options_block, socks_proxy) }
168 #endif
169 #ifdef SUPPORT_TLS
170 ,{ "tls_certificate", opt_stringptr,
171 (void *)offsetof(smtp_transport_options_block, tls_certificate) },
172 { "tls_crl", opt_stringptr,
173 (void *)offsetof(smtp_transport_options_block, tls_crl) },
174 { "tls_dh_min_bits", opt_int,
175 (void *)offsetof(smtp_transport_options_block, tls_dh_min_bits) },
176 { "tls_privatekey", opt_stringptr,
177 (void *)offsetof(smtp_transport_options_block, tls_privatekey) },
178 { "tls_require_ciphers", opt_stringptr,
179 (void *)offsetof(smtp_transport_options_block, tls_require_ciphers) },
180 { "tls_sni", opt_stringptr,
181 (void *)offsetof(smtp_transport_options_block, tls_sni) },
182 { "tls_tempfail_tryclear", opt_bool,
183 (void *)offsetof(smtp_transport_options_block, tls_tempfail_tryclear) },
184 { "tls_try_verify_hosts", opt_stringptr,
185 (void *)offsetof(smtp_transport_options_block, tls_try_verify_hosts) },
186 { "tls_verify_cert_hostnames", opt_stringptr,
187 (void *)offsetof(smtp_transport_options_block,tls_verify_cert_hostnames)},
188 { "tls_verify_certificates", opt_stringptr,
189 (void *)offsetof(smtp_transport_options_block, tls_verify_certificates) },
190 { "tls_verify_hosts", opt_stringptr,
191 (void *)offsetof(smtp_transport_options_block, tls_verify_hosts) }
192 #endif
193 };
194
195 /* Size of the options list. An extern variable has to be used so that its
196 address can appear in the tables drtables.c. */
197
198 int smtp_transport_options_count =
199 sizeof(smtp_transport_options)/sizeof(optionlist);
200
201
202 #ifdef MACRO_PREDEF
203
204 /* Dummy values */
205 smtp_transport_options_block smtp_transport_option_defaults = {0};
206 void smtp_transport_init(transport_instance *tblock) {}
207 BOOL smtp_transport_entry(transport_instance *tblock, address_item *addr) {return FALSE;}
208 void smtp_transport_closedown(transport_instance *tblock) {}
209
210 #else /*!MACRO_PREDEF*/
211
212
213 /* Default private options block for the smtp transport. */
214
215 smtp_transport_options_block smtp_transport_option_defaults = {
216 .hosts = NULL,
217 .fallback_hosts = NULL,
218 .hostlist = NULL,
219 .fallback_hostlist = NULL,
220 .helo_data = US"$primary_hostname",
221 .interface = NULL,
222 .port = NULL,
223 .protocol = US"smtp",
224 .dscp = NULL,
225 .serialize_hosts = NULL,
226 .hosts_try_auth = NULL,
227 .hosts_require_auth = NULL,
228 .hosts_try_chunking = US"*",
229 #ifdef SUPPORT_DANE
230 .hosts_try_dane = NULL,
231 .hosts_require_dane = NULL,
232 .dane_require_tls_ciphers = NULL,
233 #endif
234 .hosts_try_fastopen = NULL,
235 #ifndef DISABLE_PRDR
236 .hosts_try_prdr = US"*",
237 #endif
238 #ifndef DISABLE_OCSP
239 .hosts_request_ocsp = US"*", /* hosts_request_ocsp (except under DANE; tls_client_start()) */
240 .hosts_require_ocsp = NULL,
241 #endif
242 .hosts_require_tls = NULL,
243 .hosts_avoid_tls = NULL,
244 .hosts_verify_avoid_tls = NULL,
245 .hosts_avoid_pipelining = NULL,
246 .hosts_avoid_esmtp = NULL,
247 #ifdef SUPPORT_TLS
248 .hosts_nopass_tls = NULL,
249 .hosts_noproxy_tls = US"*",
250 #endif
251 .command_timeout = 5*60,
252 .connect_timeout = 5*60,
253 .data_timeout = 5*60,
254 .final_timeout = 10*60,
255 .size_addition = 1024,
256 .hosts_max_try = 5,
257 .hosts_max_try_hardlimit = 50,
258 .address_retry_include_sender = TRUE,
259 .allow_localhost = FALSE,
260 .authenticated_sender_force = FALSE,
261 .gethostbyname = FALSE,
262 .dns_qualify_single = TRUE,
263 .dns_search_parents = FALSE,
264 .dnssec = { .request=NULL, .require=NULL },
265 .delay_after_cutoff = TRUE,
266 .hosts_override = FALSE,
267 .hosts_randomize = FALSE,
268 .keepalive = TRUE,
269 .lmtp_ignore_quota = FALSE,
270 .expand_retry_include_ip_address = NULL,
271 .retry_include_ip_address = TRUE,
272 #ifdef SUPPORT_SOCKS
273 .socks_proxy = NULL,
274 #endif
275 #ifdef SUPPORT_TLS
276 .tls_certificate = NULL,
277 .tls_crl = NULL,
278 .tls_privatekey = NULL,
279 .tls_require_ciphers = NULL,
280 .tls_sni = NULL,
281 .tls_verify_certificates = US"system",
282 .tls_dh_min_bits = EXIM_CLIENT_DH_DEFAULT_MIN_BITS,
283 .tls_tempfail_tryclear = TRUE,
284 .tls_verify_hosts = NULL,
285 .tls_try_verify_hosts = US"*",
286 .tls_verify_cert_hostnames = US"*",
287 #endif
288 #ifndef DISABLE_DKIM
289 .dkim =
290 {.dkim_domain = NULL,
291 .dkim_identity = NULL,
292 .dkim_private_key = NULL,
293 .dkim_selector = NULL,
294 .dkim_canon = NULL,
295 .dkim_sign_headers = NULL,
296 .dkim_strict = NULL,
297 .dkim_hash = US"sha256",
298 .dot_stuffed = FALSE,
299 .force_bodyhash = FALSE,
300 # ifdef EXPERIMENTAL_ARC
301 .arc_signspec = NULL,
302 # endif
303 },
304 # ifdef EXPERIMENTAL_ARC
305 .arc_sign = NULL,
306 # endif
307 #endif
308 };
309
310 /* some DSN flags for use later */
311
312 static int rf_list[] = {rf_notify_never, rf_notify_success,
313 rf_notify_failure, rf_notify_delay };
314
315 static uschar *rf_names[] = { US"NEVER", US"SUCCESS", US"FAILURE", US"DELAY" };
316
317
318
319 /* Local statics */
320
321 static uschar *smtp_command; /* Points to last cmd for error messages */
322 static uschar *mail_command; /* Points to MAIL cmd for error messages */
323 static uschar *data_command = US""; /* Points to DATA cmd for error messages */
324 static BOOL update_waiting; /* TRUE to update the "wait" database */
325
326 /*XXX move to smtp_context */
327 static BOOL pipelining_active; /* current transaction is in pipe mode */
328
329
330 /*************************************************
331 * Setup entry point *
332 *************************************************/
333
334 /* This function is called when the transport is about to be used,
335 but before running it in a sub-process. It is used for two things:
336
337 (1) To set the fallback host list in addresses, when delivering.
338 (2) To pass back the interface, port, protocol, and other options, for use
339 during callout verification.
340
341 Arguments:
342 tblock pointer to the transport instance block
343 addrlist list of addresses about to be transported
344 tf if not NULL, pointer to block in which to return options
345 uid the uid that will be set (not used)
346 gid the gid that will be set (not used)
347 errmsg place for error message (not used)
348
349 Returns: OK always (FAIL, DEFER not used)
350 */
351
352 static int
353 smtp_transport_setup(transport_instance *tblock, address_item *addrlist,
354 transport_feedback *tf, uid_t uid, gid_t gid, uschar **errmsg)
355 {
356 smtp_transport_options_block *ob =
357 (smtp_transport_options_block *)(tblock->options_block);
358
359 errmsg = errmsg; /* Keep picky compilers happy */
360 uid = uid;
361 gid = gid;
362
363 /* Pass back options if required. This interface is getting very messy. */
364
365 if (tf)
366 {
367 tf->interface = ob->interface;
368 tf->port = ob->port;
369 tf->protocol = ob->protocol;
370 tf->hosts = ob->hosts;
371 tf->hosts_override = ob->hosts_override;
372 tf->hosts_randomize = ob->hosts_randomize;
373 tf->gethostbyname = ob->gethostbyname;
374 tf->qualify_single = ob->dns_qualify_single;
375 tf->search_parents = ob->dns_search_parents;
376 tf->helo_data = ob->helo_data;
377 }
378
379 /* Set the fallback host list for all the addresses that don't have fallback
380 host lists, provided that the local host wasn't present in the original host
381 list. */
382
383 if (!testflag(addrlist, af_local_host_removed))
384 for (; addrlist; addrlist = addrlist->next)
385 if (!addrlist->fallback_hosts) addrlist->fallback_hosts = ob->fallback_hostlist;
386
387 return OK;
388 }
389
390
391
392 /*************************************************
393 * Initialization entry point *
394 *************************************************/
395
396 /* Called for each instance, after its options have been read, to
397 enable consistency checks to be done, or anything else that needs
398 to be set up.
399
400 Argument: pointer to the transport instance block
401 Returns: nothing
402 */
403
404 void
405 smtp_transport_init(transport_instance *tblock)
406 {
407 smtp_transport_options_block *ob =
408 (smtp_transport_options_block *)(tblock->options_block);
409
410 /* Retry_use_local_part defaults FALSE if unset */
411
412 if (tblock->retry_use_local_part == TRUE_UNSET)
413 tblock->retry_use_local_part = FALSE;
414
415 /* Set the default port according to the protocol */
416
417 if (ob->port == NULL)
418 ob->port = (strcmpic(ob->protocol, US"lmtp") == 0)? US"lmtp" :
419 (strcmpic(ob->protocol, US"smtps") == 0)? US"smtps" : US"smtp";
420
421 /* Set up the setup entry point, to be called before subprocesses for this
422 transport. */
423
424 tblock->setup = smtp_transport_setup;
425
426 /* Complain if any of the timeouts are zero. */
427
428 if (ob->command_timeout <= 0 || ob->data_timeout <= 0 ||
429 ob->final_timeout <= 0)
430 log_write(0, LOG_PANIC_DIE|LOG_CONFIG,
431 "command, data, or final timeout value is zero for %s transport",
432 tblock->name);
433
434 /* If hosts_override is set and there are local hosts, set the global
435 flag that stops verify from showing router hosts. */
436
437 if (ob->hosts_override && ob->hosts != NULL) tblock->overrides_hosts = TRUE;
438
439 /* If there are any fallback hosts listed, build a chain of host items
440 for them, but do not do any lookups at this time. */
441
442 host_build_hostlist(&(ob->fallback_hostlist), ob->fallback_hosts, FALSE);
443 }
444
445
446
447
448
449 /*************************************************
450 * Set delivery info into all active addresses *
451 *************************************************/
452
453 /* Only addresses whose status is >= PENDING are relevant. A lesser
454 status means that an address is not currently being processed.
455
456 Arguments:
457 addrlist points to a chain of addresses
458 errno_value to put in each address's errno field
459 msg to put in each address's message field
460 rc to put in each address's transport_return field
461 pass_message if TRUE, set the "pass message" flag in the address
462 host if set, mark addrs as having used this host
463 smtp_greeting from peer
464 helo_response from peer
465
466 If errno_value has the special value ERRNO_CONNECTTIMEOUT, ETIMEDOUT is put in
467 the errno field, and RTEF_CTOUT is ORed into the more_errno field, to indicate
468 this particular type of timeout.
469
470 Returns: nothing
471 */
472
473 static void
474 set_errno(address_item *addrlist, int errno_value, uschar *msg, int rc,
475 BOOL pass_message, host_item * host
476 #ifdef EXPERIMENTAL_DSN_INFO
477 , const uschar * smtp_greeting, const uschar * helo_response
478 #endif
479 )
480 {
481 address_item *addr;
482 int orvalue = 0;
483 if (errno_value == ERRNO_CONNECTTIMEOUT)
484 {
485 errno_value = ETIMEDOUT;
486 orvalue = RTEF_CTOUT;
487 }
488 for (addr = addrlist; addr; addr = addr->next)
489 if (addr->transport_return >= PENDING)
490 {
491 addr->basic_errno = errno_value;
492 addr->more_errno |= orvalue;
493 if (msg)
494 {
495 addr->message = msg;
496 if (pass_message) setflag(addr, af_pass_message);
497 }
498 addr->transport_return = rc;
499 if (host)
500 {
501 addr->host_used = host;
502 #ifdef EXPERIMENTAL_DSN_INFO
503 if (smtp_greeting)
504 {uschar * s = Ustrchr(smtp_greeting, '\n'); if (s) *s = '\0';}
505 addr->smtp_greeting = smtp_greeting;
506
507 if (helo_response)
508 {uschar * s = Ustrchr(helo_response, '\n'); if (s) *s = '\0';}
509 addr->helo_response = helo_response;
510 #endif
511 }
512 }
513 }
514
515 static void
516 set_errno_nohost(address_item *addrlist, int errno_value, uschar *msg, int rc,
517 BOOL pass_message)
518 {
519 set_errno(addrlist, errno_value, msg, rc, pass_message, NULL
520 #ifdef EXPERIMENTAL_DSN_INFO
521 , NULL, NULL
522 #endif
523 );
524 }
525
526
527 /*************************************************
528 * Check an SMTP response *
529 *************************************************/
530
531 /* This function is given an errno code and the SMTP response buffer
532 to analyse, together with the host identification for generating messages. It
533 sets an appropriate message and puts the first digit of the response code into
534 the yield variable. If no response was actually read, a suitable digit is
535 chosen.
536
537 Arguments:
538 host the current host, to get its name for messages
539 errno_value pointer to the errno value
540 more_errno from the top address for use with ERRNO_FILTER_FAIL
541 buffer the SMTP response buffer
542 yield where to put a one-digit SMTP response code
543 message where to put an error message
544 pass_message set TRUE if message is an SMTP response
545
546 Returns: TRUE if an SMTP "QUIT" command should be sent, else FALSE
547 */
548
549 static BOOL
550 check_response(host_item *host, int *errno_value, int more_errno,
551 uschar *buffer, int *yield, uschar **message, BOOL *pass_message)
552 {
553 uschar * pl = pipelining_active ? US"pipelined " : US"";
554 const uschar * s;
555
556 *yield = '4'; /* Default setting is to give a temporary error */
557
558 switch(*errno_value)
559 {
560 case ETIMEDOUT: /* Handle response timeout */
561 *message = US string_sprintf("SMTP timeout after %s%s",
562 pl, smtp_command);
563 if (transport_count > 0)
564 *message = US string_sprintf("%s (%d bytes written)", *message,
565 transport_count);
566 return FALSE;
567
568 case ERRNO_SMTPFORMAT: /* Handle malformed SMTP response */
569 s = string_printing(buffer);
570 while (isspace(*s)) s++;
571 *message = *s == 0
572 ? string_sprintf("Malformed SMTP reply (an empty line) "
573 "in response to %s%s", pl, smtp_command)
574 : string_sprintf("Malformed SMTP reply in response to %s%s: %s",
575 pl, smtp_command, s);
576 return FALSE;
577
578 case ERRNO_FILTER_FAIL: /* Handle a failed filter process error;
579 can't send QUIT as we mustn't end the DATA. */
580 *message = string_sprintf("transport filter process failed (%d)%s",
581 more_errno,
582 more_errno == EX_EXECFAILED ? ": unable to execute command" : "");
583 return FALSE;
584
585 case ERRNO_CHHEADER_FAIL: /* Handle a failed add_headers expansion;
586 can't send QUIT as we mustn't end the DATA. */
587 *message =
588 string_sprintf("failed to expand headers_add or headers_remove: %s",
589 expand_string_message);
590 return FALSE;
591
592 case ERRNO_WRITEINCOMPLETE: /* failure to write a complete data block */
593 *message = string_sprintf("failed to write a data block");
594 return FALSE;
595
596 #ifdef SUPPORT_I18N
597 case ERRNO_UTF8_FWD: /* no advertised SMTPUTF8, for international message */
598 *message = US"utf8 support required but not offered for forwarding";
599 DEBUG(D_deliver|D_transport) debug_printf("%s\n", *message);
600 return TRUE;
601 #endif
602 }
603
604 /* Handle error responses from the remote mailer. */
605
606 if (buffer[0] != 0)
607 {
608 *message = string_sprintf("SMTP error from remote mail server after %s%s: "
609 "%s", pl, smtp_command, s = string_printing(buffer));
610 *pass_message = TRUE;
611 *yield = buffer[0];
612 return TRUE;
613 }
614
615 /* No data was read. If there is no errno, this must be the EOF (i.e.
616 connection closed) case, which causes deferral. An explicit connection reset
617 error has the same effect. Otherwise, put the host's identity in the message,
618 leaving the errno value to be interpreted as well. In all cases, we have to
619 assume the connection is now dead. */
620
621 if (*errno_value == 0 || *errno_value == ECONNRESET)
622 {
623 *errno_value = ERRNO_SMTPCLOSED;
624 *message = US string_sprintf("Remote host closed connection "
625 "in response to %s%s", pl, smtp_command);
626 }
627 else
628 *message = US string_sprintf("%s [%s]", host->name, host->address);
629
630 return FALSE;
631 }
632
633
634
635 /*************************************************
636 * Write error message to logs *
637 *************************************************/
638
639 /* This writes to the main log and to the message log.
640
641 Arguments:
642 host the current host
643 detail the current message (addr_item->message)
644 basic_errno the errno (addr_item->basic_errno)
645
646 Returns: nothing
647 */
648
649 static void
650 write_logs(const host_item *host, const uschar *suffix, int basic_errno)
651 {
652
653
654 uschar *message = LOGGING(outgoing_port)
655 ? string_sprintf("H=%s [%s]:%d", host->name, host->address,
656 host->port == PORT_NONE ? 25 : host->port)
657 : string_sprintf("H=%s [%s]", host->name, host->address);
658
659 if (suffix)
660 {
661 message = string_sprintf("%s: %s", message, suffix);
662 if (basic_errno > 0)
663 message = string_sprintf("%s: %s", message, strerror(basic_errno));
664 }
665 else
666 message = string_sprintf("%s %s", message, exim_errstr(basic_errno));
667
668 log_write(0, LOG_MAIN, "%s", message);
669 deliver_msglog("%s %s\n", tod_stamp(tod_log), message);
670 }
671
672 static void
673 msglog_line(host_item * host, uschar * message)
674 {
675 deliver_msglog("%s H=%s [%s] %s\n", tod_stamp(tod_log),
676 host->name, host->address, message);
677 }
678
679
680
681 #ifndef DISABLE_EVENT
682 /*************************************************
683 * Post-defer action *
684 *************************************************/
685
686 /* This expands an arbitrary per-transport string.
687 It might, for example, be used to write to the database log.
688
689 Arguments:
690 addr the address item containing error information
691 host the current host
692
693 Returns: nothing
694 */
695
696 static void
697 deferred_event_raise(address_item *addr, host_item *host)
698 {
699 uschar * action = addr->transport->event_action;
700 const uschar * save_domain;
701 uschar * save_local;
702
703 if (!action)
704 return;
705
706 save_domain = deliver_domain;
707 save_local = deliver_localpart;
708
709 /*XXX would ip & port already be set up? */
710 deliver_host_address = string_copy(host->address);
711 deliver_host_port = host->port == PORT_NONE ? 25 : host->port;
712 event_defer_errno = addr->basic_errno;
713
714 router_name = addr->router->name;
715 transport_name = addr->transport->name;
716 deliver_domain = addr->domain;
717 deliver_localpart = addr->local_part;
718
719 (void) event_raise(action, US"msg:host:defer",
720 addr->message
721 ? addr->basic_errno > 0
722 ? string_sprintf("%s: %s", addr->message, strerror(addr->basic_errno))
723 : string_copy(addr->message)
724 : addr->basic_errno > 0
725 ? string_copy(US strerror(addr->basic_errno))
726 : NULL);
727
728 deliver_localpart = save_local;
729 deliver_domain = save_domain;
730 router_name = transport_name = NULL;
731 }
732 #endif
733
734 /*************************************************
735 * Synchronize SMTP responses *
736 *************************************************/
737
738 /* This function is called from smtp_deliver() to receive SMTP responses from
739 the server, and match them up with the commands to which they relate. When
740 PIPELINING is not in use, this function is called after every command, and is
741 therefore somewhat over-engineered, but it is simpler to use a single scheme
742 that works both with and without PIPELINING instead of having two separate sets
743 of code.
744
745 The set of commands that are buffered up with pipelining may start with MAIL
746 and may end with DATA; in between are RCPT commands that correspond to the
747 addresses whose status is PENDING_DEFER. All other commands (STARTTLS, AUTH,
748 etc.) are never buffered.
749
750 Errors after MAIL or DATA abort the whole process leaving the response in the
751 buffer. After MAIL, pending responses are flushed, and the original command is
752 re-instated in big_buffer for error messages. For RCPT commands, the remote is
753 permitted to reject some recipient addresses while accepting others. However
754 certain errors clearly abort the whole process. Set the value in
755 transport_return to PENDING_OK if the address is accepted. If there is a
756 subsequent general error, it will get reset accordingly. If not, it will get
757 converted to OK at the end.
758
759 Arguments:
760 sx smtp connection context
761 count the number of responses to read
762 pending_DATA 0 if last command sent was not DATA
763 +1 if previously had a good recipient
764 -1 if not previously had a good recipient
765
766 Returns: 3 if at least one address had 2xx and one had 5xx
767 2 if at least one address had 5xx but none had 2xx
768 1 if at least one host had a 2xx response, but none had 5xx
769 0 no address had 2xx or 5xx but no errors (all 4xx, or just DATA)
770 -1 timeout while reading RCPT response
771 -2 I/O or other non-response error for RCPT
772 -3 DATA or MAIL failed - errno and buffer set
773 */
774
775 static int
776 sync_responses(smtp_context * sx, int count, int pending_DATA)
777 {
778 address_item *addr = sx->sync_addr;
779 smtp_transport_options_block *ob =
780 (smtp_transport_options_block *)sx->tblock->options_block;
781 int yield = 0;
782
783 /* Handle the response for a MAIL command. On error, reinstate the original
784 command in big_buffer for error message use, and flush any further pending
785 responses before returning, except after I/O errors and timeouts. */
786
787 if (sx->pending_MAIL)
788 {
789 count--;
790 if (!smtp_read_response(&sx->inblock, sx->buffer, sizeof(sx->buffer),
791 '2', ob->command_timeout))
792 {
793 DEBUG(D_transport) debug_printf("bad response for MAIL\n");
794 Ustrcpy(big_buffer, mail_command); /* Fits, because it came from there! */
795 if (errno == 0 && sx->buffer[0] != 0)
796 {
797 uschar flushbuffer[4096];
798 int save_errno = 0;
799 if (sx->buffer[0] == '4')
800 {
801 save_errno = ERRNO_MAIL4XX;
802 addr->more_errno |= ((sx->buffer[1] - '0')*10 + sx->buffer[2] - '0') << 8;
803 }
804 while (count-- > 0)
805 {
806 if (!smtp_read_response(&sx->inblock, flushbuffer, sizeof(flushbuffer),
807 '2', ob->command_timeout)
808 && (errno != 0 || flushbuffer[0] == 0))
809 break;
810 }
811 errno = save_errno;
812 }
813
814 if (pending_DATA) count--; /* Number of RCPT responses to come */
815 while (count-- > 0) /* Mark any pending addrs with the host used */
816 {
817 while (addr->transport_return != PENDING_DEFER) addr = addr->next;
818 addr->host_used = sx->host;
819 addr = addr->next;
820 }
821 return -3;
822 }
823 }
824
825 if (pending_DATA) count--; /* Number of RCPT responses to come */
826
827 /* Read and handle the required number of RCPT responses, matching each one up
828 with an address by scanning for the next address whose status is PENDING_DEFER.
829 */
830
831 while (count-- > 0)
832 {
833 while (addr->transport_return != PENDING_DEFER)
834 if (!(addr = addr->next))
835 return -2;
836
837 /* The address was accepted */
838 addr->host_used = sx->host;
839
840 if (smtp_read_response(&sx->inblock, sx->buffer, sizeof(sx->buffer),
841 '2', ob->command_timeout))
842 {
843 yield |= 1;
844 addr->transport_return = PENDING_OK;
845
846 /* If af_dr_retry_exists is set, there was a routing delay on this address;
847 ensure that any address-specific retry record is expunged. We do this both
848 for the basic key and for the version that also includes the sender. */
849
850 if (testflag(addr, af_dr_retry_exists))
851 {
852 uschar *altkey = string_sprintf("%s:<%s>", addr->address_retry_key,
853 sender_address);
854 retry_add_item(addr, altkey, rf_delete);
855 retry_add_item(addr, addr->address_retry_key, rf_delete);
856 }
857 }
858
859 /* Timeout while reading the response */
860
861 else if (errno == ETIMEDOUT)
862 {
863 uschar *message = string_sprintf("SMTP timeout after RCPT TO:<%s>",
864 transport_rcpt_address(addr, sx->tblock->rcpt_include_affixes));
865 set_errno_nohost(sx->first_addr, ETIMEDOUT, message, DEFER, FALSE);
866 retry_add_item(addr, addr->address_retry_key, 0);
867 update_waiting = FALSE;
868 return -1;
869 }
870
871 /* Handle other errors in obtaining an SMTP response by returning -1. This
872 will cause all the addresses to be deferred. Restore the SMTP command in
873 big_buffer for which we are checking the response, so the error message
874 makes sense. */
875
876 else if (errno != 0 || sx->buffer[0] == 0)
877 {
878 string_format(big_buffer, big_buffer_size, "RCPT TO:<%s>",
879 transport_rcpt_address(addr, sx->tblock->rcpt_include_affixes));
880 return -2;
881 }
882
883 /* Handle SMTP permanent and temporary response codes. */
884
885 else
886 {
887 addr->message =
888 string_sprintf("SMTP error from remote mail server after RCPT TO:<%s>: "
889 "%s", transport_rcpt_address(addr, sx->tblock->rcpt_include_affixes),
890 string_printing(sx->buffer));
891 setflag(addr, af_pass_message);
892 if (!sx->verify)
893 msglog_line(sx->host, addr->message);
894
895 /* The response was 5xx */
896
897 if (sx->buffer[0] == '5')
898 {
899 addr->transport_return = FAIL;
900 yield |= 2;
901 }
902
903 /* The response was 4xx */
904
905 else
906 {
907 addr->transport_return = DEFER;
908 addr->basic_errno = ERRNO_RCPT4XX;
909 addr->more_errno |= ((sx->buffer[1] - '0')*10 + sx->buffer[2] - '0') << 8;
910
911 if (!sx->verify)
912 {
913 #ifndef DISABLE_EVENT
914 event_defer_errno = addr->more_errno;
915 msg_event_raise(US"msg:rcpt:host:defer", addr);
916 #endif
917
918 /* Log temporary errors if there are more hosts to be tried.
919 If not, log this last one in the == line. */
920
921 if (sx->host->next)
922 log_write(0, LOG_MAIN, "H=%s [%s]: %s",
923 sx->host->name, sx->host->address, addr->message);
924
925 #ifndef DISABLE_EVENT
926 else
927 msg_event_raise(US"msg:rcpt:defer", addr);
928 #endif
929
930 /* Do not put this message on the list of those waiting for specific
931 hosts, as otherwise it is likely to be tried too often. */
932
933 update_waiting = FALSE;
934
935 /* Add a retry item for the address so that it doesn't get tried again
936 too soon. If address_retry_include_sender is true, add the sender address
937 to the retry key. */
938
939 retry_add_item(addr,
940 ob->address_retry_include_sender
941 ? string_sprintf("%s:<%s>", addr->address_retry_key, sender_address)
942 : addr->address_retry_key,
943 0);
944 }
945 }
946 }
947 } /* Loop for next RCPT response */
948
949 /* Update where to start at for the next block of responses, unless we
950 have already handled all the addresses. */
951
952 if (addr) sx->sync_addr = addr->next;
953
954 /* Handle a response to DATA. If we have not had any good recipients, either
955 previously or in this block, the response is ignored. */
956
957 if (pending_DATA != 0 &&
958 !smtp_read_response(&sx->inblock, sx->buffer, sizeof(sx->buffer),
959 '3', ob->command_timeout))
960 {
961 int code;
962 uschar *msg;
963 BOOL pass_message;
964 if (pending_DATA > 0 || (yield & 1) != 0)
965 {
966 if (errno == 0 && sx->buffer[0] == '4')
967 {
968 errno = ERRNO_DATA4XX;
969 sx->first_addr->more_errno |= ((sx->buffer[1] - '0')*10 + sx->buffer[2] - '0') << 8;
970 }
971 return -3;
972 }
973 (void)check_response(sx->host, &errno, 0, sx->buffer, &code, &msg, &pass_message);
974 DEBUG(D_transport) debug_printf("%s\nerror for DATA ignored: pipelining "
975 "is in use and there were no good recipients\n", msg);
976 }
977
978 /* All responses read and handled; MAIL (if present) received 2xx and DATA (if
979 present) received 3xx. If any RCPTs were handled and yielded anything other
980 than 4xx, yield will be set non-zero. */
981
982 return yield;
983 }
984
985
986
987 /* Do the client side of smtp-level authentication */
988 /*
989 Arguments:
990 buffer EHLO response from server (gets overwritten)
991 addrlist chain of potential addresses to deliver
992 host host to deliver to
993 ob transport options
994 ibp, obp comms channel control blocks
995
996 Returns:
997 OK Success, or failed (but not required): global "smtp_authenticated" set
998 DEFER Failed authentication (and was required)
999 ERROR Internal problem
1000
1001 FAIL_SEND Failed communications - transmit
1002 FAIL - response
1003 */
1004
1005 int
1006 smtp_auth(uschar *buffer, unsigned bufsize, address_item *addrlist, host_item *host,
1007 smtp_transport_options_block *ob, BOOL is_esmtp,
1008 smtp_inblock *ibp, smtp_outblock *obp)
1009 {
1010 int require_auth;
1011 uschar *fail_reason = US"server did not advertise AUTH support";
1012
1013 smtp_authenticated = FALSE;
1014 client_authenticator = client_authenticated_id = client_authenticated_sender = NULL;
1015 require_auth = verify_check_given_host(&ob->hosts_require_auth, host);
1016
1017 if (is_esmtp && !regex_AUTH) regex_AUTH =
1018 regex_must_compile(US"\\n250[\\s\\-]AUTH\\s+([\\-\\w\\s]+)(?:\\n|$)",
1019 FALSE, TRUE);
1020
1021 if (is_esmtp && regex_match_and_setup(regex_AUTH, buffer, 0, -1))
1022 {
1023 uschar *names = string_copyn(expand_nstring[1], expand_nlength[1]);
1024 expand_nmax = -1; /* reset */
1025
1026 /* Must not do this check until after we have saved the result of the
1027 regex match above. */
1028
1029 if (require_auth == OK ||
1030 verify_check_given_host(&ob->hosts_try_auth, host) == OK)
1031 {
1032 auth_instance *au;
1033 fail_reason = US"no common mechanisms were found";
1034
1035 DEBUG(D_transport) debug_printf("scanning authentication mechanisms\n");
1036
1037 /* Scan the configured authenticators looking for one which is configured
1038 for use as a client, which is not suppressed by client_condition, and
1039 whose name matches an authentication mechanism supported by the server.
1040 If one is found, attempt to authenticate by calling its client function.
1041 */
1042
1043 for (au = auths; !smtp_authenticated && au; au = au->next)
1044 {
1045 uschar *p = names;
1046 if (!au->client ||
1047 (au->client_condition != NULL &&
1048 !expand_check_condition(au->client_condition, au->name,
1049 US"client authenticator")))
1050 {
1051 DEBUG(D_transport) debug_printf("skipping %s authenticator: %s\n",
1052 au->name,
1053 (au->client)? "client_condition is false" :
1054 "not configured as a client");
1055 continue;
1056 }
1057
1058 /* Loop to scan supported server mechanisms */
1059
1060 while (*p)
1061 {
1062 int rc;
1063 int len = Ustrlen(au->public_name);
1064 while (isspace(*p)) p++;
1065
1066 if (strncmpic(au->public_name, p, len) != 0 ||
1067 (p[len] != 0 && !isspace(p[len])))
1068 {
1069 while (*p != 0 && !isspace(*p)) p++;
1070 continue;
1071 }
1072
1073 /* Found data for a listed mechanism. Call its client entry. Set
1074 a flag in the outblock so that data is overwritten after sending so
1075 that reflections don't show it. */
1076
1077 fail_reason = US"authentication attempt(s) failed";
1078 obp->authenticating = TRUE;
1079 rc = (au->info->clientcode)(au, ibp, obp,
1080 ob->command_timeout, buffer, bufsize);
1081 obp->authenticating = FALSE;
1082 DEBUG(D_transport) debug_printf("%s authenticator yielded %d\n",
1083 au->name, rc);
1084
1085 /* A temporary authentication failure must hold up delivery to
1086 this host. After a permanent authentication failure, we carry on
1087 to try other authentication methods. If all fail hard, try to
1088 deliver the message unauthenticated unless require_auth was set. */
1089
1090 switch(rc)
1091 {
1092 case OK:
1093 smtp_authenticated = TRUE; /* stops the outer loop */
1094 client_authenticator = au->name;
1095 if (au->set_client_id != NULL)
1096 client_authenticated_id = expand_string(au->set_client_id);
1097 break;
1098
1099 /* Failure after writing a command */
1100
1101 case FAIL_SEND:
1102 return FAIL_SEND;
1103
1104 /* Failure after reading a response */
1105
1106 case FAIL:
1107 if (errno != 0 || buffer[0] != '5') return FAIL;
1108 log_write(0, LOG_MAIN, "%s authenticator failed H=%s [%s] %s",
1109 au->name, host->name, host->address, buffer);
1110 break;
1111
1112 /* Failure by some other means. In effect, the authenticator
1113 decided it wasn't prepared to handle this case. Typically this
1114 is the result of "fail" in an expansion string. Do we need to
1115 log anything here? Feb 2006: a message is now put in the buffer
1116 if logging is required. */
1117
1118 case CANCELLED:
1119 if (*buffer != 0)
1120 log_write(0, LOG_MAIN, "%s authenticator cancelled "
1121 "authentication H=%s [%s] %s", au->name, host->name,
1122 host->address, buffer);
1123 break;
1124
1125 /* Internal problem, message in buffer. */
1126
1127 case ERROR:
1128 set_errno_nohost(addrlist, ERRNO_AUTHPROB, string_copy(buffer),
1129 DEFER, FALSE);
1130 return ERROR;
1131 }
1132
1133 break; /* If not authenticated, try next authenticator */
1134 } /* Loop for scanning supported server mechanisms */
1135 } /* Loop for further authenticators */
1136 }
1137 }
1138
1139 /* If we haven't authenticated, but are required to, give up. */
1140
1141 if (require_auth == OK && !smtp_authenticated)
1142 {
1143 set_errno_nohost(addrlist, ERRNO_AUTHFAIL,
1144 string_sprintf("authentication required but %s", fail_reason), DEFER,
1145 FALSE);
1146 return DEFER;
1147 }
1148
1149 return OK;
1150 }
1151
1152
1153 /* Construct AUTH appendix string for MAIL TO */
1154 /*
1155 Arguments
1156 buffer to build string
1157 addrlist chain of potential addresses to deliver
1158 ob transport options
1159
1160 Globals smtp_authenticated
1161 client_authenticated_sender
1162 Return True on error, otherwise buffer has (possibly empty) terminated string
1163 */
1164
1165 BOOL
1166 smtp_mail_auth_str(uschar *buffer, unsigned bufsize, address_item *addrlist,
1167 smtp_transport_options_block *ob)
1168 {
1169 uschar *local_authenticated_sender = authenticated_sender;
1170
1171 #ifdef notdef
1172 debug_printf("smtp_mail_auth_str: as<%s> os<%s> SA<%s>\n", authenticated_sender, ob->authenticated_sender, smtp_authenticated?"Y":"N");
1173 #endif
1174
1175 if (ob->authenticated_sender != NULL)
1176 {
1177 uschar *new = expand_string(ob->authenticated_sender);
1178 if (new == NULL)
1179 {
1180 if (!expand_string_forcedfail)
1181 {
1182 uschar *message = string_sprintf("failed to expand "
1183 "authenticated_sender: %s", expand_string_message);
1184 set_errno_nohost(addrlist, ERRNO_EXPANDFAIL, message, DEFER, FALSE);
1185 return TRUE;
1186 }
1187 }
1188 else if (new[0] != 0) local_authenticated_sender = new;
1189 }
1190
1191 /* Add the authenticated sender address if present */
1192
1193 if ((smtp_authenticated || ob->authenticated_sender_force) &&
1194 local_authenticated_sender != NULL)
1195 {
1196 string_format(buffer, bufsize, " AUTH=%s",
1197 auth_xtextencode(local_authenticated_sender,
1198 Ustrlen(local_authenticated_sender)));
1199 client_authenticated_sender = string_copy(local_authenticated_sender);
1200 }
1201 else
1202 *buffer= 0;
1203
1204 return FALSE;
1205 }
1206
1207
1208
1209 #ifdef SUPPORT_DANE
1210 /* Lookup TLSA record for host/port.
1211 Return: OK success with dnssec; DANE mode
1212 DEFER Do not use this host now, may retry later
1213 FAIL_FORCED No TLSA record; DANE not usable
1214 FAIL Do not use this connection
1215 */
1216
1217 int
1218 tlsa_lookup(const host_item * host, dns_answer * dnsa, BOOL dane_required)
1219 {
1220 /* move this out to host.c given the similarity to dns_lookup() ? */
1221 uschar buffer[300];
1222 const uschar * fullname = buffer;
1223 int rc;
1224 BOOL sec;
1225
1226 /* TLSA lookup string */
1227 (void)sprintf(CS buffer, "_%d._tcp.%.256s", host->port, host->name);
1228
1229 rc = dns_lookup(dnsa, buffer, T_TLSA, &fullname);
1230 sec = dns_is_secure(dnsa);
1231 DEBUG(D_transport)
1232 debug_printf("TLSA lookup ret %d %sDNSSEC\n", rc, sec ? "" : "not ");
1233
1234 switch (rc)
1235 {
1236 case DNS_AGAIN:
1237 return DEFER; /* just defer this TLS'd conn */
1238
1239 case DNS_SUCCEED:
1240 if (sec) return OK;
1241 log_write(0, LOG_MAIN,
1242 "DANE error: TLSA lookup for %s not DNSSEC", host->name);
1243 /*FALLTRHOUGH*/
1244
1245 case DNS_NODATA: /* no TLSA RR for this lookup */
1246 case DNS_NOMATCH: /* no records at all for this lookup */
1247 return dane_required ? FAIL : FAIL_FORCED;
1248
1249 default:
1250 case DNS_FAIL:
1251 return dane_required ? FAIL : DEFER;
1252 }
1253 }
1254 #endif
1255
1256
1257
1258 typedef struct smtp_compare_s
1259 {
1260 uschar *current_sender_address;
1261 struct transport_instance *tblock;
1262 } smtp_compare_t;
1263
1264
1265 /* Create a unique string that identifies this message, it is based on
1266 sender_address, helo_data and tls_certificate if enabled.
1267 */
1268
1269 static uschar *
1270 smtp_local_identity(uschar * sender, struct transport_instance * tblock)
1271 {
1272 address_item * addr1;
1273 uschar * if1 = US"";
1274 uschar * helo1 = US"";
1275 #ifdef SUPPORT_TLS
1276 uschar * tlsc1 = US"";
1277 #endif
1278 uschar * save_sender_address = sender_address;
1279 uschar * local_identity = NULL;
1280 smtp_transport_options_block * ob =
1281 (smtp_transport_options_block *)tblock->options_block;
1282
1283 sender_address = sender;
1284
1285 addr1 = deliver_make_addr (sender, TRUE);
1286 deliver_set_expansions(addr1);
1287
1288 if (ob->interface)
1289 if1 = expand_string(ob->interface);
1290
1291 if (ob->helo_data)
1292 helo1 = expand_string(ob->helo_data);
1293
1294 #ifdef SUPPORT_TLS
1295 if (ob->tls_certificate)
1296 tlsc1 = expand_string(ob->tls_certificate);
1297 local_identity = string_sprintf ("%s^%s^%s", if1, helo1, tlsc1);
1298 #else
1299 local_identity = string_sprintf ("%s^%s", if1, helo1);
1300 #endif
1301
1302 deliver_set_expansions(NULL);
1303 sender_address = save_sender_address;
1304
1305 return local_identity;
1306 }
1307
1308
1309
1310 /* This routine is a callback that is called from transport_check_waiting.
1311 This function will evaluate the incoming message versus the previous
1312 message. If the incoming message is using a different local identity then
1313 we will veto this new message. */
1314
1315 static BOOL
1316 smtp_are_same_identities(uschar * message_id, smtp_compare_t * s_compare)
1317 {
1318 uschar * message_local_identity,
1319 * current_local_identity,
1320 * new_sender_address;
1321
1322 current_local_identity =
1323 smtp_local_identity(s_compare->current_sender_address, s_compare->tblock);
1324
1325 if (!(new_sender_address = deliver_get_sender_address(message_id)))
1326 return 0;
1327
1328 message_local_identity =
1329 smtp_local_identity(new_sender_address, s_compare->tblock);
1330
1331 return Ustrcmp(current_local_identity, message_local_identity) == 0;
1332 }
1333
1334
1335
1336 static uschar
1337 ehlo_response(uschar * buf, uschar checks)
1338 {
1339 size_t bsize = Ustrlen(buf);
1340
1341 #ifdef SUPPORT_TLS
1342 if ( checks & OPTION_TLS
1343 && pcre_exec(regex_STARTTLS, NULL, CS buf, bsize, 0, PCRE_EOPT, NULL, 0) < 0)
1344 checks &= ~OPTION_TLS;
1345 #endif
1346
1347 if ( checks & OPTION_IGNQ
1348 && pcre_exec(regex_IGNOREQUOTA, NULL, CS buf, bsize, 0,
1349 PCRE_EOPT, NULL, 0) < 0)
1350 checks &= ~OPTION_IGNQ;
1351
1352 if ( checks & OPTION_CHUNKING
1353 && pcre_exec(regex_CHUNKING, NULL, CS buf, bsize, 0, PCRE_EOPT, NULL, 0) < 0)
1354 checks &= ~OPTION_CHUNKING;
1355
1356 #ifndef DISABLE_PRDR
1357 if ( checks & OPTION_PRDR
1358 && pcre_exec(regex_PRDR, NULL, CS buf, bsize, 0, PCRE_EOPT, NULL, 0) < 0)
1359 checks &= ~OPTION_PRDR;
1360 #endif
1361
1362 #ifdef SUPPORT_I18N
1363 if ( checks & OPTION_UTF8
1364 && pcre_exec(regex_UTF8, NULL, CS buf, bsize, 0, PCRE_EOPT, NULL, 0) < 0)
1365 checks &= ~OPTION_UTF8;
1366 #endif
1367
1368 if ( checks & OPTION_DSN
1369 && pcre_exec(regex_DSN, NULL, CS buf, bsize, 0, PCRE_EOPT, NULL, 0) < 0)
1370 checks &= ~OPTION_DSN;
1371
1372 if ( checks & OPTION_PIPE
1373 && pcre_exec(regex_PIPELINING, NULL, CS buf, bsize, 0,
1374 PCRE_EOPT, NULL, 0) < 0)
1375 checks &= ~OPTION_PIPE;
1376
1377 if ( checks & OPTION_SIZE
1378 && pcre_exec(regex_SIZE, NULL, CS buf, bsize, 0, PCRE_EOPT, NULL, 0) < 0)
1379 checks &= ~OPTION_SIZE;
1380
1381 return checks;
1382 }
1383
1384
1385
1386 /* Callback for emitting a BDAT data chunk header.
1387
1388 If given a nonzero size, first flush any buffered SMTP commands
1389 then emit the command.
1390
1391 Reap previous SMTP command responses if requested, and always reap
1392 the response from a previous BDAT command.
1393
1394 Args:
1395 tctx transport context
1396 chunk_size value for SMTP BDAT command
1397 flags
1398 tc_chunk_last add LAST option to SMTP BDAT command
1399 tc_reap_prev reap response to previous SMTP commands
1400
1401 Returns: OK or ERROR
1402 */
1403
1404 static int
1405 smtp_chunk_cmd_callback(transport_ctx * tctx, unsigned chunk_size,
1406 unsigned flags)
1407 {
1408 smtp_transport_options_block * ob =
1409 (smtp_transport_options_block *)(tctx->tblock->options_block);
1410 smtp_context * sx = tctx->smtp_context;
1411 int cmd_count = 0;
1412 int prev_cmd_count;
1413
1414 /* Write SMTP chunk header command. If not reaping responses, note that
1415 there may be more writes (like, the chunk data) done soon. */
1416
1417 if (chunk_size > 0)
1418 {
1419 if((cmd_count = smtp_write_command(&sx->outblock,
1420 flags & tc_reap_prev ? SCMD_FLUSH : SCMD_MORE,
1421 "BDAT %u%s\r\n", chunk_size, flags & tc_chunk_last ? " LAST" : "")
1422 ) < 0) return ERROR;
1423 if (flags & tc_chunk_last)
1424 data_command = string_copy(big_buffer); /* Save for later error message */
1425 }
1426
1427 prev_cmd_count = cmd_count += sx->cmd_count;
1428
1429 /* Reap responses for any previous, but not one we just emitted */
1430
1431 if (chunk_size > 0)
1432 prev_cmd_count--;
1433 if (sx->pending_BDAT)
1434 prev_cmd_count--;
1435
1436 if (flags & tc_reap_prev && prev_cmd_count > 0)
1437 {
1438 DEBUG(D_transport) debug_printf("look for %d responses"
1439 " for previous pipelined cmds\n", prev_cmd_count);
1440
1441 switch(sync_responses(sx, prev_cmd_count, 0))
1442 {
1443 case 1: /* 2xx (only) => OK */
1444 case 3: sx->good_RCPT = TRUE; /* 2xx & 5xx => OK & progress made */
1445 case 2: sx->completed_addr = TRUE; /* 5xx (only) => progress made */
1446 case 0: break; /* No 2xx or 5xx, but no probs */
1447
1448 case -1: /* Timeout on RCPT */
1449 default: return ERROR; /* I/O error, or any MAIL/DATA error */
1450 }
1451 cmd_count = 1;
1452 if (!sx->pending_BDAT)
1453 pipelining_active = FALSE;
1454 }
1455
1456 /* Reap response for an outstanding BDAT */
1457
1458 if (sx->pending_BDAT)
1459 {
1460 DEBUG(D_transport) debug_printf("look for one response for BDAT\n");
1461
1462 if (!smtp_read_response(&sx->inblock, sx->buffer, sizeof(sx->buffer), '2',
1463 ob->command_timeout))
1464 {
1465 if (errno == 0 && sx->buffer[0] == '4')
1466 {
1467 errno = ERRNO_DATA4XX; /*XXX does this actually get used? */
1468 sx->addrlist->more_errno |=
1469 ((sx->buffer[1] - '0')*10 + sx->buffer[2] - '0') << 8;
1470 }
1471 return ERROR;
1472 }
1473 cmd_count--;
1474 sx->pending_BDAT = FALSE;
1475 pipelining_active = FALSE;
1476 }
1477 else if (chunk_size > 0)
1478 sx->pending_BDAT = TRUE;
1479
1480
1481 sx->cmd_count = cmd_count;
1482 return OK;
1483 }
1484
1485
1486
1487 /*************************************************
1488 * Make connection for given message *
1489 *************************************************/
1490
1491 /*
1492 Arguments:
1493 ctx connection context
1494 suppress_tls if TRUE, don't attempt a TLS connection - this is set for
1495 a second attempt after TLS initialization fails
1496
1497 Returns: OK - the connection was made and the delivery attempted;
1498 fd is set in the conn context, tls_out set up.
1499 DEFER - the connection could not be made, or something failed
1500 while setting up the SMTP session, or there was a
1501 non-message-specific error, such as a timeout.
1502 ERROR - helo_data or add_headers or authenticated_sender is
1503 specified for this transport, and the string failed
1504 to expand
1505 */
1506 int
1507 smtp_setup_conn(smtp_context * sx, BOOL suppress_tls)
1508 {
1509 #if defined(SUPPORT_TLS) && defined(SUPPORT_DANE)
1510 dns_answer tlsa_dnsa;
1511 #endif
1512 BOOL pass_message = FALSE;
1513 uschar * message = NULL;
1514 int yield = OK;
1515 int rc;
1516
1517 sx->ob = (smtp_transport_options_block *) sx->tblock->options_block;
1518
1519 sx->lmtp = strcmpic(sx->ob->protocol, US"lmtp") == 0;
1520 sx->smtps = strcmpic(sx->ob->protocol, US"smtps") == 0;
1521 sx->ok = FALSE;
1522 sx->send_rset = TRUE;
1523 sx->send_quit = TRUE;
1524 sx->setting_up = TRUE;
1525 sx->esmtp = TRUE;
1526 sx->esmtp_sent = FALSE;
1527 #ifdef SUPPORT_I18N
1528 sx->utf8_needed = FALSE;
1529 #endif
1530 sx->dsn_all_lasthop = TRUE;
1531 #if defined(SUPPORT_TLS) && defined(SUPPORT_DANE)
1532 sx->dane = FALSE;
1533 sx->dane_required = verify_check_given_host(&sx->ob->hosts_require_dane, sx->host) == OK;
1534 #endif
1535
1536 if ((sx->max_rcpt = sx->tblock->max_addresses) == 0) sx->max_rcpt = 999999;
1537 sx->peer_offered = 0;
1538 sx->avoid_option = 0;
1539 sx->igquotstr = US"";
1540 if (!sx->helo_data) sx->helo_data = sx->ob->helo_data;
1541 #ifdef EXPERIMENTAL_DSN_INFO
1542 sx->smtp_greeting = NULL;
1543 sx->helo_response = NULL;
1544 #endif
1545
1546 smtp_command = US"initial connection";
1547 sx->buffer[0] = '\0';
1548
1549 /* Set up the buffer for reading SMTP response packets. */
1550
1551 sx->inblock.buffer = sx->inbuffer;
1552 sx->inblock.buffersize = sizeof(sx->inbuffer);
1553 sx->inblock.ptr = sx->inbuffer;
1554 sx->inblock.ptrend = sx->inbuffer;
1555
1556 /* Set up the buffer for holding SMTP commands while pipelining */
1557
1558 sx->outblock.buffer = sx->outbuffer;
1559 sx->outblock.buffersize = sizeof(sx->outbuffer);
1560 sx->outblock.ptr = sx->outbuffer;
1561 sx->outblock.cmd_count = 0;
1562 sx->outblock.authenticating = FALSE;
1563
1564 /* Reset the parameters of a TLS session. */
1565
1566 tls_out.bits = 0;
1567 tls_out.cipher = NULL; /* the one we may use for this transport */
1568 tls_out.ourcert = NULL;
1569 tls_out.peercert = NULL;
1570 tls_out.peerdn = NULL;
1571 #if defined(SUPPORT_TLS) && !defined(USE_GNUTLS)
1572 tls_out.sni = NULL;
1573 #endif
1574 tls_out.ocsp = OCSP_NOT_REQ;
1575
1576 /* Flip the legacy TLS-related variables over to the outbound set in case
1577 they're used in the context of the transport. Don't bother resetting
1578 afterward (when being used by a transport) as we're in a subprocess.
1579 For verify, unflipped once the callout is dealt with */
1580
1581 tls_modify_variables(&tls_out);
1582
1583 #ifndef SUPPORT_TLS
1584 if (sx->smtps)
1585 {
1586 set_errno_nohost(sx->addrlist, ERRNO_TLSFAILURE, US"TLS support not available",
1587 DEFER, FALSE);
1588 return ERROR;
1589 }
1590 #endif
1591
1592 /* Make a connection to the host if this isn't a continued delivery, and handle
1593 the initial interaction and HELO/EHLO/LHLO. Connect timeout errors are handled
1594 specially so they can be identified for retries. */
1595
1596 if (!continue_hostname)
1597 {
1598 if (sx->verify)
1599 HDEBUG(D_verify) debug_printf("interface=%s port=%d\n", sx->interface, sx->port);
1600
1601 /* Get the actual port the connection will use, into sx->host */
1602
1603 smtp_port_for_connect(sx->host, sx->port);
1604
1605 #if defined(SUPPORT_TLS) && defined(SUPPORT_DANE)
1606 /* Do TLSA lookup for DANE */
1607 {
1608 tls_out.dane_verified = FALSE;
1609 tls_out.tlsa_usage = 0;
1610
1611 if (sx->host->dnssec == DS_YES)
1612 {
1613 if( sx->dane_required
1614 || verify_check_given_host(&sx->ob->hosts_try_dane, sx->host) == OK
1615 )
1616 switch (rc = tlsa_lookup(sx->host, &tlsa_dnsa, sx->dane_required))
1617 {
1618 case OK: sx->dane = TRUE;
1619 sx->ob->tls_tempfail_tryclear = FALSE;
1620 break;
1621 case FAIL_FORCED: break;
1622 default: set_errno_nohost(sx->addrlist, ERRNO_DNSDEFER,
1623 string_sprintf("DANE error: tlsa lookup %s",
1624 rc == DEFER ? "DEFER" : "FAIL"),
1625 rc, FALSE);
1626 (void) event_raise(sx->tblock->event_action,
1627 US"dane:fail", sx->dane_required
1628 ? US"dane-required" : US"dnssec-invalid");
1629 return rc;
1630 }
1631 }
1632 else if (sx->dane_required)
1633 {
1634 set_errno_nohost(sx->addrlist, ERRNO_DNSDEFER,
1635 string_sprintf("DANE error: %s lookup not DNSSEC", sx->host->name),
1636 FAIL, FALSE);
1637 (void) event_raise(sx->tblock->event_action,
1638 US"dane:fail", US"dane-required");
1639 return FAIL;
1640 }
1641 }
1642 #endif /*DANE*/
1643
1644 /* Make the TCP connection */
1645
1646 sx->inblock.sock = sx->outblock.sock =
1647 smtp_connect(sx->host, sx->host_af, sx->interface,
1648 sx->ob->connect_timeout, sx->tblock);
1649
1650 if (sx->inblock.sock < 0)
1651 {
1652 uschar * msg = NULL;
1653 if (sx->verify)
1654 {
1655 msg = US strerror(errno);
1656 HDEBUG(D_verify) debug_printf("connect: %s\n", msg);
1657 }
1658 set_errno_nohost(sx->addrlist,
1659 errno == ETIMEDOUT ? ERRNO_CONNECTTIMEOUT : errno,
1660 sx->verify ? string_sprintf("could not connect: %s", msg)
1661 : NULL,
1662 DEFER, FALSE);
1663 sx->send_quit = FALSE;
1664 return DEFER;
1665 }
1666
1667 /* Expand the greeting message while waiting for the initial response. (Makes
1668 sense if helo_data contains ${lookup dnsdb ...} stuff). The expansion is
1669 delayed till here so that $sending_interface and $sending_port are set. */
1670
1671 if (sx->helo_data)
1672 if (!(sx->helo_data = expand_string(sx->helo_data)))
1673 if (sx->verify)
1674 log_write(0, LOG_MAIN|LOG_PANIC,
1675 "<%s>: failed to expand transport's helo_data value for callout: %s",
1676 sx->addrlist->address, expand_string_message);
1677
1678 #ifdef SUPPORT_I18N
1679 if (sx->helo_data)
1680 {
1681 expand_string_message = NULL;
1682 if ((sx->helo_data = string_domain_utf8_to_alabel(sx->helo_data,
1683 &expand_string_message)),
1684 expand_string_message)
1685 if (sx->verify)
1686 log_write(0, LOG_MAIN|LOG_PANIC,
1687 "<%s>: failed to expand transport's helo_data value for callout: %s",
1688 sx->addrlist->address, expand_string_message);
1689 else
1690 sx->helo_data = NULL;
1691 }
1692 #endif
1693
1694 /* The first thing is to wait for an initial OK response. The dreaded "goto"
1695 is nevertheless a reasonably clean way of programming this kind of logic,
1696 where you want to escape on any error. */
1697
1698 if (!sx->smtps)
1699 {
1700 BOOL good_response;
1701
1702 #ifdef TCP_QUICKACK
1703 (void) setsockopt(sx->inblock.sock, IPPROTO_TCP, TCP_QUICKACK, US &off, sizeof(off));
1704 #endif
1705 good_response = smtp_read_response(&sx->inblock, sx->buffer, sizeof(sx->buffer),
1706 '2', sx->ob->command_timeout);
1707 #ifdef EXPERIMENTAL_DSN_INFO
1708 sx->smtp_greeting = string_copy(sx->buffer);
1709 #endif
1710 if (!good_response) goto RESPONSE_FAILED;
1711
1712 #ifndef DISABLE_EVENT
1713 {
1714 uschar * s;
1715 lookup_dnssec_authenticated = sx->host->dnssec==DS_YES ? US"yes"
1716 : sx->host->dnssec==DS_NO ? US"no" : NULL;
1717 s = event_raise(sx->tblock->event_action, US"smtp:connect", sx->buffer);
1718 if (s)
1719 {
1720 set_errno_nohost(sx->addrlist, ERRNO_EXPANDFAIL,
1721 string_sprintf("deferred by smtp:connect event expansion: %s", s),
1722 DEFER, FALSE);
1723 yield = DEFER;
1724 goto SEND_QUIT;
1725 }
1726 }
1727 #endif
1728
1729 /* Now check if the helo_data expansion went well, and sign off cleanly if
1730 it didn't. */
1731
1732 if (!sx->helo_data)
1733 {
1734 message = string_sprintf("failed to expand helo_data: %s",
1735 expand_string_message);
1736 set_errno_nohost(sx->addrlist, ERRNO_EXPANDFAIL, message, DEFER, FALSE);
1737 yield = DEFER;
1738 goto SEND_QUIT;
1739 }
1740 }
1741
1742 /** Debugging without sending a message
1743 sx->addrlist->transport_return = DEFER;
1744 goto SEND_QUIT;
1745 **/
1746
1747 /* Errors that occur after this point follow an SMTP command, which is
1748 left in big_buffer by smtp_write_command() for use in error messages. */
1749
1750 smtp_command = big_buffer;
1751
1752 /* Tell the remote who we are...
1753
1754 February 1998: A convention has evolved that ESMTP-speaking MTAs include the
1755 string "ESMTP" in their greeting lines, so make Exim send EHLO if the
1756 greeting is of this form. The assumption was that the far end supports it
1757 properly... but experience shows that there are some that give 5xx responses,
1758 even though the banner includes "ESMTP" (there's a bloody-minded one that
1759 says "ESMTP not spoken here"). Cope with that case.
1760
1761 September 2000: Time has passed, and it seems reasonable now to always send
1762 EHLO at the start. It is also convenient to make the change while installing
1763 the TLS stuff.
1764
1765 July 2003: Joachim Wieland met a broken server that advertises "PIPELINING"
1766 but times out after sending MAIL FROM, RCPT TO and DATA all together. There
1767 would be no way to send out the mails, so there is now a host list
1768 "hosts_avoid_esmtp" that disables ESMTP for special hosts and solves the
1769 PIPELINING problem as well. Maybe it can also be useful to cure other
1770 problems with broken servers.
1771
1772 Exim originally sent "Helo" at this point and ran for nearly a year that way.
1773 Then somebody tried it with a Microsoft mailer... It seems that all other
1774 mailers use upper case for some reason (the RFC is quite clear about case
1775 independence) so, for peace of mind, I gave in. */
1776
1777 sx->esmtp = verify_check_given_host(&sx->ob->hosts_avoid_esmtp, sx->host) != OK;
1778
1779 /* Alas; be careful, since this goto is not an error-out, so conceivably
1780 we might set data between here and the target which we assume to exist
1781 and be usable. I can see this coming back to bite us. */
1782 #ifdef SUPPORT_TLS
1783 if (sx->smtps)
1784 {
1785 smtp_peer_options |= OPTION_TLS;
1786 suppress_tls = FALSE;
1787 sx->ob->tls_tempfail_tryclear = FALSE;
1788 smtp_command = US"SSL-on-connect";
1789 goto TLS_NEGOTIATE;
1790 }
1791 #endif
1792
1793 if (sx->esmtp)
1794 {
1795 if (smtp_write_command(&sx->outblock, SCMD_FLUSH, "%s %s\r\n",
1796 sx->lmtp ? "LHLO" : "EHLO", sx->helo_data) < 0)
1797 goto SEND_FAILED;
1798 sx->esmtp_sent = TRUE;
1799 if (!smtp_read_response(&sx->inblock, sx->buffer, sizeof(sx->buffer), '2',
1800 sx->ob->command_timeout))
1801 {
1802 if (errno != 0 || sx->buffer[0] == 0 || sx->lmtp)
1803 {
1804 #ifdef EXPERIMENTAL_DSN_INFO
1805 sx->helo_response = string_copy(sx->buffer);
1806 #endif
1807 goto RESPONSE_FAILED;
1808 }
1809 sx->esmtp = FALSE;
1810 }
1811 #ifdef EXPERIMENTAL_DSN_INFO
1812 sx->helo_response = string_copy(sx->buffer);
1813 #endif
1814 }
1815 else
1816 DEBUG(D_transport)
1817 debug_printf("not sending EHLO (host matches hosts_avoid_esmtp)\n");
1818
1819 if (!sx->esmtp)
1820 {
1821 BOOL good_response;
1822 int n = sizeof(sx->buffer);
1823 uschar * rsp = sx->buffer;
1824
1825 if (sx->esmtp_sent && (n = Ustrlen(sx->buffer)) < sizeof(sx->buffer)/2)
1826 { rsp = sx->buffer + n + 1; n = sizeof(sx->buffer) - n; }
1827
1828 if (smtp_write_command(&sx->outblock, SCMD_FLUSH, "HELO %s\r\n", sx->helo_data) < 0)
1829 goto SEND_FAILED;
1830 good_response = smtp_read_response(&sx->inblock, rsp, n,
1831 '2', sx->ob->command_timeout);
1832 #ifdef EXPERIMENTAL_DSN_INFO
1833 sx->helo_response = string_copy(rsp);
1834 #endif
1835 if (!good_response)
1836 {
1837 /* Handle special logging for a closed connection after HELO
1838 when had previously sent EHLO */
1839
1840 if (rsp != sx->buffer && rsp[0] == 0 && (errno == 0 || errno == ECONNRESET))
1841 {
1842 errno = ERRNO_SMTPCLOSED;
1843 goto EHLOHELO_FAILED;
1844 }
1845 memmove(sx->buffer, rsp, Ustrlen(rsp));
1846 goto RESPONSE_FAILED;
1847 }
1848 }
1849
1850 sx->avoid_option = sx->peer_offered = smtp_peer_options = 0;
1851
1852 if (sx->esmtp || sx->lmtp)
1853 {
1854 sx->peer_offered = ehlo_response(sx->buffer,
1855 OPTION_TLS /* others checked later */
1856 );
1857
1858 /* Set tls_offered if the response to EHLO specifies support for STARTTLS. */
1859
1860 #ifdef SUPPORT_TLS
1861 smtp_peer_options |= sx->peer_offered & OPTION_TLS;
1862 #endif
1863 }
1864 }
1865
1866 /* For continuing deliveries down the same channel, having re-exec'd the socket
1867 is the standard input; for a socket held open from verify it is recorded
1868 in the cutthrough context block. Either way we don't need to redo EHLO here
1869 (but may need to do so for TLS - see below).
1870 Set up the pointer to where subsequent commands will be left, for
1871 error messages. Note that smtp_peer_options will have been
1872 set from the command line if they were set in the process that passed the
1873 connection on. */
1874
1875 /*XXX continue case needs to propagate DSN_INFO, prob. in deliver.c
1876 as the continue goes via transport_pass_socket() and doublefork and exec.
1877 It does not wait. Unclear how we keep separate host's responses
1878 separate - we could match up by host ip+port as a bodge. */
1879
1880 else
1881 {
1882 if (cutthrough.fd >= 0 && cutthrough.callout_hold_only)
1883 {
1884 sx->inblock.sock = sx->outblock.sock = cutthrough.fd;
1885 sx->host->port = sx->port = cutthrough.host.port;
1886 }
1887 else
1888 {
1889 sx->inblock.sock = sx->outblock.sock = 0; /* stdin */
1890 smtp_port_for_connect(sx->host, sx->port); /* Record the port that was used */
1891 }
1892 smtp_command = big_buffer;
1893 sx->helo_data = NULL; /* ensure we re-expand ob->helo_data */
1894
1895 /* For a continued connection with TLS being proxied for us, or a
1896 held-open verify connection with TLS, nothing more to do. */
1897
1898 if ( continue_proxy_cipher
1899 || (cutthrough.fd >= 0 && cutthrough.callout_hold_only && cutthrough.is_tls)
1900 )
1901 {
1902 sx->peer_offered = smtp_peer_options;
1903 pipelining_active = !!(smtp_peer_options & OPTION_PIPE);
1904 HDEBUG(D_transport) debug_printf("continued connection, %s TLS\n",
1905 continue_proxy_cipher ? "proxied" : "verify conn with");
1906 return OK;
1907 }
1908 HDEBUG(D_transport) debug_printf("continued connection, no TLS\n");
1909 }
1910
1911 /* If TLS is available on this connection, whether continued or not, attempt to
1912 start up a TLS session, unless the host is in hosts_avoid_tls. If successful,
1913 send another EHLO - the server may give a different answer in secure mode. We
1914 use a separate buffer for reading the response to STARTTLS so that if it is
1915 negative, the original EHLO data is available for subsequent analysis, should
1916 the client not be required to use TLS. If the response is bad, copy the buffer
1917 for error analysis. */
1918
1919 #ifdef SUPPORT_TLS
1920 if ( smtp_peer_options & OPTION_TLS
1921 && !suppress_tls
1922 && verify_check_given_host(&sx->ob->hosts_avoid_tls, sx->host) != OK
1923 && ( !sx->verify
1924 || verify_check_given_host(&sx->ob->hosts_verify_avoid_tls, sx->host) != OK
1925 ) )
1926 {
1927 uschar buffer2[4096];
1928 if (smtp_write_command(&sx->outblock, SCMD_FLUSH, "STARTTLS\r\n") < 0)
1929 goto SEND_FAILED;
1930
1931 /* If there is an I/O error, transmission of this message is deferred. If
1932 there is a temporary rejection of STARRTLS and tls_tempfail_tryclear is
1933 false, we also defer. However, if there is a temporary rejection of STARTTLS
1934 and tls_tempfail_tryclear is true, or if there is an outright rejection of
1935 STARTTLS, we carry on. This means we will try to send the message in clear,
1936 unless the host is in hosts_require_tls (tested below). */
1937
1938 if (!smtp_read_response(&sx->inblock, buffer2, sizeof(buffer2), '2',
1939 sx->ob->command_timeout))
1940 {
1941 if ( errno != 0
1942 || buffer2[0] == 0
1943 || (buffer2[0] == '4' && !sx->ob->tls_tempfail_tryclear)
1944 )
1945 {
1946 Ustrncpy(sx->buffer, buffer2, sizeof(sx->buffer));
1947 sx->buffer[sizeof(sx->buffer)-1] = '\0';
1948 goto RESPONSE_FAILED;
1949 }
1950 }
1951
1952 /* STARTTLS accepted: try to negotiate a TLS session. */
1953
1954 else
1955 TLS_NEGOTIATE:
1956 {
1957 address_item * addr;
1958 uschar * errstr;
1959 int rc = tls_client_start(sx->inblock.sock, sx->host, sx->addrlist, sx->tblock,
1960 # ifdef SUPPORT_DANE
1961 sx->dane ? &tlsa_dnsa : NULL,
1962 # endif
1963 &errstr);
1964
1965 /* TLS negotiation failed; give an error. From outside, this function may
1966 be called again to try in clear on a new connection, if the options permit
1967 it for this host. */
1968
1969 if (rc != OK)
1970 {
1971 # ifdef SUPPORT_DANE
1972 if (sx->dane)
1973 {
1974 log_write(0, LOG_MAIN,
1975 "DANE attempt failed; TLS connection to %s [%s]: %s",
1976 sx->host->name, sx->host->address, errstr);
1977 (void) event_raise(sx->tblock->event_action,
1978 US"dane:fail", US"validation-failure"); /* could do with better detail */
1979 }
1980 # endif
1981
1982 errno = ERRNO_TLSFAILURE;
1983 message = string_sprintf("TLS session: %s", errstr);
1984 sx->send_quit = FALSE;
1985 goto TLS_FAILED;
1986 }
1987
1988 /* TLS session is set up */
1989
1990 smtp_peer_options_wrap = smtp_peer_options;
1991 for (addr = sx->addrlist; addr; addr = addr->next)
1992 if (addr->transport_return == PENDING_DEFER)
1993 {
1994 addr->cipher = tls_out.cipher;
1995 addr->ourcert = tls_out.ourcert;
1996 addr->peercert = tls_out.peercert;
1997 addr->peerdn = tls_out.peerdn;
1998 addr->ocsp = tls_out.ocsp;
1999 }
2000 }
2001 }
2002
2003 /* if smtps, we'll have smtp_command set to something else; always safe to
2004 reset it here. */
2005 smtp_command = big_buffer;
2006
2007 /* If we started TLS, redo the EHLO/LHLO exchange over the secure channel. If
2008 helo_data is null, we are dealing with a connection that was passed from
2009 another process, and so we won't have expanded helo_data above. We have to
2010 expand it here. $sending_ip_address and $sending_port are set up right at the
2011 start of the Exim process (in exim.c). */
2012
2013 if (tls_out.active >= 0)
2014 {
2015 char *greeting_cmd;
2016 BOOL good_response;
2017
2018 if (!sx->helo_data && !(sx->helo_data = expand_string(sx->ob->helo_data)))
2019 {
2020 uschar *message = string_sprintf("failed to expand helo_data: %s",
2021 expand_string_message);
2022 set_errno_nohost(sx->addrlist, ERRNO_EXPANDFAIL, message, DEFER, FALSE);
2023 yield = DEFER;
2024 goto SEND_QUIT;
2025 }
2026
2027 /* For SMTPS we need to wait for the initial OK response. */
2028 if (sx->smtps)
2029 {
2030 good_response = smtp_read_response(&sx->inblock, sx->buffer, sizeof(sx->buffer),
2031 '2', sx->ob->command_timeout);
2032 #ifdef EXPERIMENTAL_DSN_INFO
2033 sx->smtp_greeting = string_copy(sx->buffer);
2034 #endif
2035 if (!good_response) goto RESPONSE_FAILED;
2036 }
2037
2038 if (sx->esmtp)
2039 greeting_cmd = "EHLO";
2040 else
2041 {
2042 greeting_cmd = "HELO";
2043 DEBUG(D_transport)
2044 debug_printf("not sending EHLO (host matches hosts_avoid_esmtp)\n");
2045 }
2046
2047 if (smtp_write_command(&sx->outblock, SCMD_FLUSH, "%s %s\r\n",
2048 sx->lmtp ? "LHLO" : greeting_cmd, sx->helo_data) < 0)
2049 goto SEND_FAILED;
2050 good_response = smtp_read_response(&sx->inblock, sx->buffer, sizeof(sx->buffer),
2051 '2', sx->ob->command_timeout);
2052 #ifdef EXPERIMENTAL_DSN_INFO
2053 sx->helo_response = string_copy(sx->buffer);
2054 #endif
2055 if (!good_response) goto RESPONSE_FAILED;
2056 smtp_peer_options = 0;
2057 }
2058
2059 /* If the host is required to use a secure channel, ensure that we
2060 have one. */
2061
2062 else if ( sx->smtps
2063 # ifdef SUPPORT_DANE
2064 || sx->dane
2065 # endif
2066 || verify_check_given_host(&sx->ob->hosts_require_tls, sx->host) == OK
2067 )
2068 {
2069 errno = ERRNO_TLSREQUIRED;
2070 message = string_sprintf("a TLS session is required, but %s",
2071 smtp_peer_options & OPTION_TLS
2072 ? "an attempt to start TLS failed" : "the server did not offer TLS support");
2073 # ifdef SUPPORT_DANE
2074 if (sx->dane)
2075 (void) event_raise(sx->tblock->event_action, US"dane:fail",
2076 smtp_peer_options & OPTION_TLS
2077 ? US"validation-failure" /* could do with better detail */
2078 : US"starttls-not-supported");
2079 # endif
2080 goto TLS_FAILED;
2081 }
2082 #endif /*SUPPORT_TLS*/
2083
2084 /* If TLS is active, we have just started it up and re-done the EHLO command,
2085 so its response needs to be analyzed. If TLS is not active and this is a
2086 continued session down a previously-used socket, we haven't just done EHLO, so
2087 we skip this. */
2088
2089 if (continue_hostname == NULL
2090 #ifdef SUPPORT_TLS
2091 || tls_out.active >= 0
2092 #endif
2093 )
2094 {
2095 if (sx->esmtp || sx->lmtp)
2096 {
2097 sx->peer_offered = ehlo_response(sx->buffer,
2098 0 /* no TLS */
2099 | (sx->lmtp && sx->ob->lmtp_ignore_quota ? OPTION_IGNQ : 0)
2100 | OPTION_CHUNKING
2101 | OPTION_PRDR
2102 #ifdef SUPPORT_I18N
2103 | (sx->addrlist->prop.utf8_msg ? OPTION_UTF8 : 0)
2104 /*XXX if we hand peercaps on to continued-conn processes,
2105 must not depend on this addr */
2106 #endif
2107 | OPTION_DSN
2108 | OPTION_PIPE
2109 | (sx->ob->size_addition >= 0 ? OPTION_SIZE : 0)
2110 );
2111
2112 /* Set for IGNOREQUOTA if the response to LHLO specifies support and the
2113 lmtp_ignore_quota option was set. */
2114
2115 sx->igquotstr = sx->peer_offered & OPTION_IGNQ ? US" IGNOREQUOTA" : US"";
2116
2117 /* If the response to EHLO specified support for the SIZE parameter, note
2118 this, provided size_addition is non-negative. */
2119
2120 smtp_peer_options |= sx->peer_offered & OPTION_SIZE;
2121
2122 /* Note whether the server supports PIPELINING. If hosts_avoid_esmtp matched
2123 the current host, esmtp will be false, so PIPELINING can never be used. If
2124 the current host matches hosts_avoid_pipelining, don't do it. */
2125
2126 if ( sx->peer_offered & OPTION_PIPE
2127 && verify_check_given_host(&sx->ob->hosts_avoid_pipelining, sx->host) != OK)
2128 smtp_peer_options |= OPTION_PIPE;
2129
2130 DEBUG(D_transport) debug_printf("%susing PIPELINING\n",
2131 smtp_peer_options & OPTION_PIPE ? "" : "not ");
2132
2133 if ( sx->peer_offered & OPTION_CHUNKING
2134 && verify_check_given_host(&sx->ob->hosts_try_chunking, sx->host) != OK)
2135 sx->peer_offered &= ~OPTION_CHUNKING;
2136
2137 if (sx->peer_offered & OPTION_CHUNKING)
2138 {DEBUG(D_transport) debug_printf("CHUNKING usable\n");}
2139
2140 #ifndef DISABLE_PRDR
2141 if ( sx->peer_offered & OPTION_PRDR
2142 && verify_check_given_host(&sx->ob->hosts_try_prdr, sx->host) != OK)
2143 sx->peer_offered &= ~OPTION_PRDR;
2144
2145 if (sx->peer_offered & OPTION_PRDR)
2146 {DEBUG(D_transport) debug_printf("PRDR usable\n");}
2147 #endif
2148
2149 /* Note if the server supports DSN */
2150 smtp_peer_options |= sx->peer_offered & OPTION_DSN;
2151 DEBUG(D_transport) debug_printf("%susing DSN\n",
2152 sx->peer_offered & OPTION_DSN ? "" : "not ");
2153
2154 /* Note if the response to EHLO specifies support for the AUTH extension.
2155 If it has, check that this host is one we want to authenticate to, and do
2156 the business. The host name and address must be available when the
2157 authenticator's client driver is running. */
2158
2159 switch (yield = smtp_auth(sx->buffer, sizeof(sx->buffer), sx->addrlist, sx->host,
2160 sx->ob, sx->esmtp, &sx->inblock, &sx->outblock))
2161 {
2162 default: goto SEND_QUIT;
2163 case OK: break;
2164 case FAIL_SEND: goto SEND_FAILED;
2165 case FAIL: goto RESPONSE_FAILED;
2166 }
2167 }
2168 }
2169 pipelining_active = !!(smtp_peer_options & OPTION_PIPE);
2170
2171 /* The setting up of the SMTP call is now complete. Any subsequent errors are
2172 message-specific. */
2173
2174 sx->setting_up = FALSE;
2175
2176 #ifdef SUPPORT_I18N
2177 if (sx->addrlist->prop.utf8_msg)
2178 {
2179 sx->utf8_needed = !sx->addrlist->prop.utf8_downcvt
2180 && !sx->addrlist->prop.utf8_downcvt_maybe;
2181 DEBUG(D_transport) if (!sx->utf8_needed)
2182 debug_printf("utf8: %s downconvert\n",
2183 sx->addrlist->prop.utf8_downcvt ? "mandatory" : "optional");
2184 }
2185
2186 /* If this is an international message we need the host to speak SMTPUTF8 */
2187 if (sx->utf8_needed && !(sx->peer_offered & OPTION_UTF8))
2188 {
2189 errno = ERRNO_UTF8_FWD;
2190 goto RESPONSE_FAILED;
2191 }
2192 #endif
2193
2194 return OK;
2195
2196
2197 {
2198 int code;
2199
2200 RESPONSE_FAILED:
2201 message = NULL;
2202 sx->send_quit = check_response(sx->host, &errno, sx->addrlist->more_errno,
2203 sx->buffer, &code, &message, &pass_message);
2204 goto FAILED;
2205
2206 SEND_FAILED:
2207 code = '4';
2208 message = US string_sprintf("send() to %s [%s] failed: %s",
2209 sx->host->name, sx->host->address, strerror(errno));
2210 sx->send_quit = FALSE;
2211 goto FAILED;
2212
2213 EHLOHELO_FAILED:
2214 code = '4';
2215 message = string_sprintf("Remote host closed connection in response to %s"
2216 " (EHLO response was: %s)", smtp_command, sx->buffer);
2217 sx->send_quit = FALSE;
2218 goto FAILED;
2219
2220 /* This label is jumped to directly when a TLS negotiation has failed,
2221 or was not done for a host for which it is required. Values will be set
2222 in message and errno, and setting_up will always be true. Treat as
2223 a temporary error. */
2224
2225 #ifdef SUPPORT_TLS
2226 TLS_FAILED:
2227 code = '4';
2228 goto FAILED;
2229 #endif
2230
2231 /* The failure happened while setting up the call; see if the failure was
2232 a 5xx response (this will either be on connection, or following HELO - a 5xx
2233 after EHLO causes it to try HELO). If so, and there are no more hosts to try,
2234 fail all addresses, as this host is never going to accept them. For other
2235 errors during setting up (timeouts or whatever), defer all addresses, and
2236 yield DEFER, so that the host is not tried again for a while.
2237
2238 XXX This peeking for another host feels like a layering violation. We want
2239 to note the host as unusable, but down here we shouldn't know if this was
2240 the last host to try for the addr(list). Perhaps the upper layer should be
2241 the one to do set_errno() ? The problem is that currently the addr is where
2242 errno etc. are stashed, but until we run out of hosts to try the errors are
2243 host-specific. Maybe we should enhance the host_item definition? */
2244
2245 FAILED:
2246 sx->ok = FALSE; /* For when reached by GOTO */
2247 set_errno(sx->addrlist, errno, message,
2248 sx->host->next
2249 ? DEFER
2250 : code == '5'
2251 #ifdef SUPPORT_I18N
2252 || errno == ERRNO_UTF8_FWD
2253 #endif
2254 ? FAIL : DEFER,
2255 pass_message, sx->host
2256 #ifdef EXPERIMENTAL_DSN_INFO
2257 , sx->smtp_greeting, sx->helo_response
2258 #endif
2259 );
2260 yield = DEFER;
2261 }
2262
2263
2264 SEND_QUIT:
2265
2266 if (sx->send_quit)
2267 (void)smtp_write_command(&sx->outblock, SCMD_FLUSH, "QUIT\r\n");
2268
2269 #ifdef SUPPORT_TLS
2270 tls_close(FALSE, TLS_SHUTDOWN_NOWAIT);
2271 #endif
2272
2273 /* Close the socket, and return the appropriate value, first setting
2274 works because the NULL setting is passed back to the calling process, and
2275 remote_max_parallel is forced to 1 when delivering over an existing connection,
2276 */
2277
2278 HDEBUG(D_transport|D_acl|D_v) debug_printf_indent(" SMTP(close)>>\n");
2279 if (sx->send_quit)
2280 {
2281 shutdown(sx->outblock.sock, SHUT_WR);
2282 if (fcntl(sx->inblock.sock, F_SETFL, O_NONBLOCK) == 0)
2283 for (rc = 16; read(sx->inblock.sock, sx->inbuffer, sizeof(sx->inbuffer)) > 0 && rc > 0;)
2284 rc--; /* drain socket */
2285 sx->send_quit = FALSE;
2286 }
2287 (void)close(sx->inblock.sock);
2288 sx->inblock.sock = sx->outblock.sock = -1;
2289
2290 #ifndef DISABLE_EVENT
2291 (void) event_raise(sx->tblock->event_action, US"tcp:close", NULL);
2292 #endif
2293
2294 continue_transport = NULL;
2295 continue_hostname = NULL;
2296 return yield;
2297 }
2298
2299
2300
2301
2302 /* Create the string of options that will be appended to the MAIL FROM:
2303 in the connection context buffer */
2304
2305 static int
2306 build_mailcmd_options(smtp_context * sx, address_item * addrlist)
2307 {
2308 uschar * p = sx->buffer;
2309 address_item * addr;
2310 int address_count;
2311
2312 *p = 0;
2313
2314 /* If we know the receiving MTA supports the SIZE qualification, and we know it,
2315 send it, adding something to the message size to allow for imprecision
2316 and things that get added en route. Exim keeps the number of lines
2317 in a message, so we can give an accurate value for the original message, but we
2318 need some additional to handle added headers. (Double "." characters don't get
2319 included in the count.) */
2320
2321 if ( message_size > 0
2322 && sx->peer_offered & OPTION_SIZE && !(sx->avoid_option & OPTION_SIZE))
2323 {
2324 /*XXX problem here under spool_files_wireformat?
2325 Or just forget about lines? Or inflate by a fixed proportion? */
2326
2327 sprintf(CS p, " SIZE=%d", message_size+message_linecount+sx->ob->size_addition);
2328 while (*p) p++;
2329 }
2330
2331 #ifndef DISABLE_PRDR
2332 /* If it supports Per-Recipient Data Reponses, and we have omre than one recipient,
2333 request that */
2334
2335 sx->prdr_active = FALSE;
2336 if (sx->peer_offered & OPTION_PRDR)
2337 for (addr = addrlist; addr; addr = addr->next)
2338 if (addr->transport_return == PENDING_DEFER)
2339 {
2340 for (addr = addr->next; addr; addr = addr->next)
2341 if (addr->transport_return == PENDING_DEFER)
2342 { /* at least two recipients to send */
2343 sx->prdr_active = TRUE;
2344 sprintf(CS p, " PRDR"); p += 5;
2345 break;
2346 }
2347 break;
2348 }
2349 #endif
2350
2351 #ifdef SUPPORT_I18N
2352 /* If it supports internationalised messages, and this meesage need that,
2353 request it */
2354
2355 if ( sx->peer_offered & OPTION_UTF8
2356 && addrlist->prop.utf8_msg
2357 && !addrlist->prop.utf8_downcvt
2358 )
2359 Ustrcpy(p, " SMTPUTF8"), p += 9;
2360 #endif
2361
2362 /* check if all addresses have DSN-lasthop flag; do not send RET and ENVID if so */
2363 for (sx->dsn_all_lasthop = TRUE, addr = addrlist, address_count = 0;
2364 addr && address_count < sx->max_rcpt;
2365 addr = addr->next) if (addr->transport_return == PENDING_DEFER)
2366 {
2367 address_count++;
2368 if (!(addr->dsn_flags & rf_dsnlasthop))
2369 {
2370 sx->dsn_all_lasthop = FALSE;
2371 break;
2372 }
2373 }
2374
2375 /* Add any DSN flags to the mail command */
2376
2377 if (sx->peer_offered & OPTION_DSN && !sx->dsn_all_lasthop)
2378 {
2379 if (dsn_ret == dsn_ret_hdrs)
2380 { Ustrcpy(p, " RET=HDRS"); p += 9; }
2381 else if (dsn_ret == dsn_ret_full)
2382 { Ustrcpy(p, " RET=FULL"); p += 9; }
2383
2384 if (dsn_envid)
2385 {
2386 string_format(p, sizeof(sx->buffer) - (p-sx->buffer), " ENVID=%s", dsn_envid);
2387 while (*p) p++;
2388 }
2389 }
2390
2391 /* If an authenticated_sender override has been specified for this transport
2392 instance, expand it. If the expansion is forced to fail, and there was already
2393 an authenticated_sender for this message, the original value will be used.
2394 Other expansion failures are serious. An empty result is ignored, but there is
2395 otherwise no check - this feature is expected to be used with LMTP and other
2396 cases where non-standard addresses (e.g. without domains) might be required. */
2397
2398 if (smtp_mail_auth_str(p, sizeof(sx->buffer) - (p-sx->buffer), addrlist, sx->ob))
2399 return ERROR;
2400
2401 return OK;
2402 }
2403
2404
2405 static void
2406 build_rcptcmd_options(smtp_context * sx, const address_item * addr)
2407 {
2408 uschar * p = sx->buffer;
2409 *p = 0;
2410
2411 /* Add any DSN flags to the rcpt command */
2412
2413 if (sx->peer_offered & OPTION_DSN && !(addr->dsn_flags & rf_dsnlasthop))
2414 {
2415 if (addr->dsn_flags & rf_dsnflags)
2416 {
2417 int i;
2418 BOOL first = TRUE;
2419
2420 Ustrcpy(p, " NOTIFY=");
2421 while (*p) p++;
2422 for (i = 0; i < nelem(rf_list); i++) if (addr->dsn_flags & rf_list[i])
2423 {
2424 if (!first) *p++ = ',';
2425 first = FALSE;
2426 Ustrcpy(p, rf_names[i]);
2427 while (*p) p++;
2428 }
2429 }
2430
2431 if (addr->dsn_orcpt)
2432 {
2433 string_format(p, sizeof(sx->buffer) - (p-sx->buffer), " ORCPT=%s",
2434 addr->dsn_orcpt);
2435 while (*p) p++;
2436 }
2437 }
2438 }
2439
2440
2441
2442 /*
2443 Return:
2444 0 good, rcpt results in addr->transport_return (PENDING_OK, DEFER, FAIL)
2445 -1 MAIL response error
2446 -2 any non-MAIL read i/o error
2447 -3 non-MAIL response timeout
2448 -4 internal error; channel still usable
2449 -5 transmit failed
2450 */
2451
2452 int
2453 smtp_write_mail_and_rcpt_cmds(smtp_context * sx, int * yield)
2454 {
2455 address_item * addr;
2456 int address_count;
2457 int rc;
2458
2459 if (build_mailcmd_options(sx, sx->first_addr) != OK)
2460 {
2461 *yield = ERROR;
2462 return -4;
2463 }
2464
2465 /* From here until we send the DATA command, we can make use of PIPELINING
2466 if the server host supports it. The code has to be able to check the responses
2467 at any point, for when the buffer fills up, so we write it totally generally.
2468 When PIPELINING is off, each command written reports that it has flushed the
2469 buffer. */
2470
2471 sx->pending_MAIL = TRUE; /* The block starts with MAIL */
2472
2473 {
2474 uschar * s = sx->from_addr;
2475 #ifdef SUPPORT_I18N
2476 uschar * errstr = NULL;
2477
2478 /* If we must downconvert, do the from-address here. Remember we had to
2479 for the to-addresses (done below), and also (ugly) for re-doing when building
2480 the delivery log line. */
2481
2482 if ( sx->addrlist->prop.utf8_msg
2483 && (sx->addrlist->prop.utf8_downcvt || !(sx->peer_offered & OPTION_UTF8))
2484 )
2485 {
2486 if (s = string_address_utf8_to_alabel(s, &errstr), errstr)
2487 {
2488 set_errno_nohost(sx->addrlist, ERRNO_EXPANDFAIL, errstr, DEFER, FALSE);
2489 *yield = ERROR;
2490 return -4;
2491 }
2492 setflag(sx->addrlist, af_utf8_downcvt);
2493 }
2494 #endif
2495
2496 rc = smtp_write_command(&sx->outblock, pipelining_active ? SCMD_BUFFER : SCMD_FLUSH,
2497 "MAIL FROM:<%s>%s\r\n", s, sx->buffer);
2498 }
2499
2500 mail_command = string_copy(big_buffer); /* Save for later error message */
2501
2502 switch(rc)
2503 {
2504 case -1: /* Transmission error */
2505 return -5;
2506
2507 case +1: /* Cmd was sent */
2508 if (!smtp_read_response(&sx->inblock, sx->buffer, sizeof(sx->buffer), '2',
2509 sx->ob->command_timeout))
2510 {
2511 if (errno == 0 && sx->buffer[0] == '4')
2512 {
2513 errno = ERRNO_MAIL4XX;
2514 sx->addrlist->more_errno |= ((sx->buffer[1] - '0')*10 + sx->buffer[2] - '0') << 8;
2515 }
2516 return -1;
2517 }
2518 sx->pending_MAIL = FALSE;
2519 break;
2520
2521 /* otherwise zero: command queued for pipeline */
2522 }
2523
2524 /* Pass over all the relevant recipient addresses for this host, which are the
2525 ones that have status PENDING_DEFER. If we are using PIPELINING, we can send
2526 several before we have to read the responses for those seen so far. This
2527 checking is done by a subroutine because it also needs to be done at the end.
2528 Send only up to max_rcpt addresses at a time, leaving next_addr pointing to
2529 the next one if not all are sent.
2530
2531 In the MUA wrapper situation, we want to flush the PIPELINING buffer for the
2532 last address because we want to abort if any recipients have any kind of
2533 problem, temporary or permanent. We know that all recipient addresses will have
2534 the PENDING_DEFER status, because only one attempt is ever made, and we know
2535 that max_rcpt will be large, so all addresses will be done at once.
2536
2537 For verify we flush the pipeline after any (the only) rcpt address. */
2538
2539 for (addr = sx->first_addr, address_count = 0;
2540 addr && address_count < sx->max_rcpt;
2541 addr = addr->next) if (addr->transport_return == PENDING_DEFER)
2542 {
2543 int count;
2544 BOOL no_flush;
2545 uschar * rcpt_addr;
2546
2547 if (tcp_out_fastopen && !tcp_out_fastopen_logged)
2548 {
2549 setflag(addr, af_tcp_fastopen_conn);
2550 if (tcp_out_fastopen > 1) setflag(addr, af_tcp_fastopen);
2551 }
2552
2553 addr->dsn_aware = sx->peer_offered & OPTION_DSN
2554 ? dsn_support_yes : dsn_support_no;
2555
2556 address_count++;
2557 no_flush = pipelining_active && !sx->verify
2558 && (!mua_wrapper || addr->next && address_count < sx->max_rcpt);
2559
2560 build_rcptcmd_options(sx, addr);
2561
2562 /* Now send the RCPT command, and process outstanding responses when
2563 necessary. After a timeout on RCPT, we just end the function, leaving the
2564 yield as OK, because this error can often mean that there is a problem with
2565 just one address, so we don't want to delay the host. */
2566
2567 rcpt_addr = transport_rcpt_address(addr, sx->tblock->rcpt_include_affixes);
2568
2569 #ifdef SUPPORT_I18N
2570 if ( testflag(sx->addrlist, af_utf8_downcvt)
2571 && !(rcpt_addr = string_address_utf8_to_alabel(rcpt_addr, NULL))
2572 )
2573 {
2574 /*XXX could we use a per-address errstr here? Not fail the whole send? */
2575 errno = ERRNO_EXPANDFAIL;
2576 return -5; /*XXX too harsh? */
2577 }
2578 #endif
2579
2580 count = smtp_write_command(&sx->outblock, no_flush ? SCMD_BUFFER : SCMD_FLUSH,
2581 "RCPT TO:<%s>%s%s\r\n", rcpt_addr, sx->igquotstr, sx->buffer);
2582
2583 if (count < 0) return -5;
2584 if (count > 0)
2585 {
2586 switch(sync_responses(sx, count, 0))
2587 {
2588 case 3: sx->ok = TRUE; /* 2xx & 5xx => OK & progress made */
2589 case 2: sx->completed_addr = TRUE; /* 5xx (only) => progress made */
2590 break;
2591
2592 case 1: sx->ok = TRUE; /* 2xx (only) => OK, but if LMTP, */
2593 if (!sx->lmtp) /* can't tell about progress yet */
2594 sx->completed_addr = TRUE;
2595 case 0: /* No 2xx or 5xx, but no probs */
2596 break;
2597
2598 case -1: return -3; /* Timeout on RCPT */
2599 case -2: return -2; /* non-MAIL read i/o error */
2600 default: return -1; /* any MAIL error */
2601 }
2602 sx->pending_MAIL = FALSE; /* Dealt with MAIL */
2603 }
2604 } /* Loop for next address */
2605
2606 tcp_out_fastopen_logged = TRUE;
2607 sx->next_addr = addr;
2608 return 0;
2609 }
2610
2611
2612 #ifdef SUPPORT_TLS
2613 /*****************************************************
2614 * Proxy TLS connection for another transport process *
2615 ******************************************************/
2616 /*
2617 Close the unused end of the pipe, fork once more, then use the given buffer
2618 as a staging area, and select on both the given fd and the TLS'd client-fd for
2619 data to read (per the coding in ip_recv() and fd_ready() this is legitimate).
2620 Do blocking full-size writes, and reads under a timeout. Once both input
2621 channels are closed, exit the process.
2622
2623 Arguments:
2624 buf space to use for buffering
2625 bufsiz size of buffer
2626 pfd pipe filedescriptor array; [0] is comms to proxied process
2627 timeout per-read timeout, seconds
2628 */
2629
2630 void
2631 smtp_proxy_tls(uschar * buf, size_t bsize, int * pfd, int timeout)
2632 {
2633 fd_set rfds, efds;
2634 int max_fd = MAX(pfd[0], tls_out.active) + 1;
2635 int rc, i, fd_bits, nbytes;
2636
2637 close(pfd[1]);
2638 if ((rc = fork()))
2639 {
2640 DEBUG(D_transport) debug_printf("proxy-proc final-pid %d\n", rc);
2641 _exit(rc < 0 ? EXIT_FAILURE : EXIT_SUCCESS);
2642 }
2643
2644 if (running_in_test_harness) millisleep(100); /* let parent debug out */
2645 set_process_info("proxying TLS connection for continued transport");
2646 FD_ZERO(&rfds);
2647 FD_SET(tls_out.active, &rfds);
2648 FD_SET(pfd[0], &rfds);
2649
2650 for (fd_bits = 3; fd_bits; )
2651 {
2652 time_t time_left = timeout;
2653 time_t time_start = time(NULL);
2654
2655 /* wait for data */
2656 efds = rfds;
2657 do
2658 {
2659 struct timeval tv = { time_left, 0 };
2660
2661 rc = select(max_fd,
2662 (SELECT_ARG2_TYPE *)&rfds, NULL, (SELECT_ARG2_TYPE *)&efds, &tv);
2663
2664 if (rc < 0 && errno == EINTR)
2665 if ((time_left -= time(NULL) - time_start) > 0) continue;
2666
2667 if (rc <= 0)
2668 {
2669 DEBUG(D_transport) if (rc == 0) debug_printf("%s: timed out\n", __FUNCTION__);
2670 goto done;
2671 }
2672
2673 if (FD_ISSET(tls_out.active, &efds) || FD_ISSET(pfd[0], &efds))
2674 {
2675 DEBUG(D_transport) debug_printf("select: exceptional cond on %s fd\n",
2676 FD_ISSET(pfd[0], &efds) ? "proxy" : "tls");
2677 goto done;
2678 }
2679 }
2680 while (rc < 0 || !(FD_ISSET(tls_out.active, &rfds) || FD_ISSET(pfd[0], &rfds)));
2681
2682 /* handle inbound data */
2683 if (FD_ISSET(tls_out.active, &rfds))
2684 if ((rc = tls_read(FALSE, buf, bsize)) <= 0)
2685 {
2686 fd_bits &= ~1;
2687 FD_CLR(tls_out.active, &rfds);
2688 shutdown(pfd[0], SHUT_WR);
2689 timeout = 5;
2690 }
2691 else
2692 {
2693 for (nbytes = 0; rc - nbytes > 0; nbytes += i)
2694 if ((i = write(pfd[0], buf + nbytes, rc - nbytes)) < 0) goto done;
2695 }
2696 else if (fd_bits & 1)
2697 FD_SET(tls_out.active, &rfds);
2698
2699 /* handle outbound data */
2700 if (FD_ISSET(pfd[0], &rfds))
2701 if ((rc = read(pfd[0], buf, bsize)) <= 0)
2702 {
2703 fd_bits = 0;
2704 tls_close(FALSE, TLS_SHUTDOWN_NOWAIT);
2705 }
2706 else
2707 {
2708 for (nbytes = 0; rc - nbytes > 0; nbytes += i)
2709 if ((i = tls_write(FALSE, buf + nbytes, rc - nbytes, FALSE)) < 0)
2710 goto done;
2711 }
2712 else if (fd_bits & 2)
2713 FD_SET(pfd[0], &rfds);
2714 }
2715
2716 done:
2717 if (running_in_test_harness) millisleep(100); /* let logging complete */
2718 exim_exit(0, US"TLS proxy");
2719 }
2720 #endif
2721
2722
2723 /*************************************************
2724 * Deliver address list to given host *
2725 *************************************************/
2726
2727 /* If continue_hostname is not null, we get here only when continuing to
2728 deliver down an existing channel. The channel was passed as the standard
2729 input. TLS is never active on a passed channel; the previous process always
2730 closes it down before passing the connection on.
2731
2732 Otherwise, we have to make a connection to the remote host, and do the
2733 initial protocol exchange.
2734
2735 When running as an MUA wrapper, if the sender or any recipient is rejected,
2736 temporarily or permanently, we force failure for all recipients.
2737
2738 Arguments:
2739 addrlist chain of potential addresses to deliver; only those whose
2740 transport_return field is set to PENDING_DEFER are currently
2741 being processed; others should be skipped - they have either
2742 been delivered to an earlier host or IP address, or been
2743 failed by one of them.
2744 host host to deliver to
2745 host_af AF_INET or AF_INET6
2746 defport default TCP/IP port to use if host does not specify, in host
2747 byte order
2748 interface interface to bind to, or NULL
2749 tblock transport instance block
2750 message_defer set TRUE if yield is OK, but all addresses were deferred
2751 because of a non-recipient, non-host failure, that is, a
2752 4xx response to MAIL FROM, DATA, or ".". This is a defer
2753 that is specific to the message.
2754 suppress_tls if TRUE, don't attempt a TLS connection - this is set for
2755 a second attempt after TLS initialization fails
2756
2757 Returns: OK - the connection was made and the delivery attempted;
2758 the result for each address is in its data block.
2759 DEFER - the connection could not be made, or something failed
2760 while setting up the SMTP session, or there was a
2761 non-message-specific error, such as a timeout.
2762 ERROR - a filter command is specified for this transport,
2763 and there was a problem setting it up; OR helo_data
2764 or add_headers or authenticated_sender is specified
2765 for this transport, and the string failed to expand
2766 */
2767
2768 static int
2769 smtp_deliver(address_item *addrlist, host_item *host, int host_af, int defport,
2770 uschar *interface, transport_instance *tblock,
2771 BOOL *message_defer, BOOL suppress_tls)
2772 {
2773 address_item *addr;
2774 int yield = OK;
2775 int save_errno;
2776 int rc;
2777 struct timeval start_delivery_time;
2778
2779 BOOL pass_message = FALSE;
2780 uschar *message = NULL;
2781 uschar new_message_id[MESSAGE_ID_LENGTH + 1];
2782
2783 smtp_context sx;
2784
2785 gettimeofday(&start_delivery_time, NULL);
2786 suppress_tls = suppress_tls; /* stop compiler warning when no TLS support */
2787 *message_defer = FALSE;
2788
2789 sx.addrlist = addrlist;
2790 sx.host = host;
2791 sx.host_af = host_af,
2792 sx.port = defport;
2793 sx.interface = interface;
2794 sx.helo_data = NULL;
2795 sx.tblock = tblock;
2796 sx.verify = FALSE;
2797
2798 /* Get the channel set up ready for a message (MAIL FROM being the next
2799 SMTP command to send */
2800
2801 if ((rc = smtp_setup_conn(&sx, suppress_tls)) != OK)
2802 return rc;
2803
2804 /* If there is a filter command specified for this transport, we can now
2805 set it up. This cannot be done until the identify of the host is known. */
2806
2807 if (tblock->filter_command)
2808 {
2809 transport_filter_timeout = tblock->filter_timeout;
2810
2811 /* On failure, copy the error to all addresses, abandon the SMTP call, and
2812 yield ERROR. */
2813
2814 if (!transport_set_up_command(&transport_filter_argv,
2815 tblock->filter_command, TRUE, DEFER, addrlist,
2816 string_sprintf("%.50s transport", tblock->name), NULL))
2817 {
2818 set_errno_nohost(addrlist->next, addrlist->basic_errno, addrlist->message, DEFER,
2819 FALSE);
2820 yield = ERROR;
2821 goto SEND_QUIT;
2822 }
2823
2824 if ( transport_filter_argv
2825 && *transport_filter_argv
2826 && **transport_filter_argv
2827 && sx.peer_offered & OPTION_CHUNKING
2828 )
2829 {
2830 sx.peer_offered &= ~OPTION_CHUNKING;
2831 DEBUG(D_transport) debug_printf("CHUNKING not usable due to transport filter\n");
2832 }
2833 }
2834
2835 sx.first_addr = addrlist;
2836
2837 /* For messages that have more than the maximum number of envelope recipients,
2838 we want to send several transactions down the same SMTP connection. (See
2839 comments in deliver.c as to how this reconciles, heuristically, with
2840 remote_max_parallel.) This optimization was added to Exim after the following
2841 code was already working. The simplest way to put it in without disturbing the
2842 code was to use a goto to jump back to this point when there is another
2843 transaction to handle. */
2844
2845 SEND_MESSAGE:
2846 sx.from_addr = return_path;
2847 sx.sync_addr = sx.first_addr;
2848 sx.ok = FALSE;
2849 sx.send_rset = TRUE;
2850 sx.completed_addr = FALSE;
2851
2852
2853 /* If we are a continued-connection-after-verify the MAIL and RCPT
2854 commands were already sent; do not re-send but do mark the addrs as
2855 having been accepted up to RCPT stage. A traditional cont-conn
2856 always has a sequence number greater than one. */
2857
2858 if (continue_hostname && continue_sequence == 1)
2859 {
2860 address_item * addr;
2861
2862 sx.peer_offered = smtp_peer_options;
2863 sx.pending_MAIL = FALSE;
2864 sx.ok = TRUE;
2865 sx.next_addr = NULL;
2866
2867 for (addr = addrlist; addr; addr = addr->next)
2868 addr->transport_return = PENDING_OK;
2869 }
2870 else
2871 {
2872 /* Initiate a message transfer. */
2873
2874 switch(smtp_write_mail_and_rcpt_cmds(&sx, &yield))
2875 {
2876 case 0: break;
2877 case -1: case -2: goto RESPONSE_FAILED;
2878 case -3: goto END_OFF;
2879 case -4: goto SEND_QUIT;
2880 default: goto SEND_FAILED;
2881 }
2882
2883 /* If we are an MUA wrapper, abort if any RCPTs were rejected, either
2884 permanently or temporarily. We should have flushed and synced after the last
2885 RCPT. */
2886
2887 if (mua_wrapper)
2888 {
2889 address_item * a;
2890 unsigned cnt;
2891
2892 for (a = sx.first_addr, cnt = 0; a && cnt < sx.max_rcpt; a = a->next, cnt++)
2893 if (a->transport_return != PENDING_OK)
2894 {
2895 /*XXX could we find a better errno than 0 here? */
2896 set_errno_nohost(addrlist, 0, a->message, FAIL,
2897 testflag(a, af_pass_message));
2898 sx.ok = FALSE;
2899 break;
2900 }
2901 }
2902 }
2903
2904 /* If ok is TRUE, we know we have got at least one good recipient, and must now
2905 send DATA, but if it is FALSE (in the normal, non-wrapper case), we may still
2906 have a good recipient buffered up if we are pipelining. We don't want to waste
2907 time sending DATA needlessly, so we only send it if either ok is TRUE or if we
2908 are pipelining. The responses are all handled by sync_responses().
2909 If using CHUNKING, do not send a BDAT until we know how big a chunk we want
2910 to send is. */
2911
2912 if ( !(sx.peer_offered & OPTION_CHUNKING)
2913 && (sx.ok || (pipelining_active && !mua_wrapper)))
2914 {
2915 int count = smtp_write_command(&sx.outblock, SCMD_FLUSH, "DATA\r\n");
2916
2917 if (count < 0) goto SEND_FAILED;
2918 switch(sync_responses(&sx, count, sx.ok ? +1 : -1))
2919 {
2920 case 3: sx.ok = TRUE; /* 2xx & 5xx => OK & progress made */
2921 case 2: sx.completed_addr = TRUE; /* 5xx (only) => progress made */
2922 break;
2923
2924 case 1: sx.ok = TRUE; /* 2xx (only) => OK, but if LMTP, */
2925 if (!sx.lmtp) sx.completed_addr = TRUE; /* can't tell about progress yet */
2926 case 0: break; /* No 2xx or 5xx, but no probs */
2927
2928 case -1: goto END_OFF; /* Timeout on RCPT */
2929 default: goto RESPONSE_FAILED; /* I/O error, or any MAIL/DATA error */
2930 }
2931 pipelining_active = FALSE;
2932 data_command = string_copy(big_buffer); /* Save for later error message */
2933 }
2934
2935 /* If there were no good recipients (but otherwise there have been no
2936 problems), just set ok TRUE, since we have handled address-specific errors
2937 already. Otherwise, it's OK to send the message. Use the check/escape mechanism
2938 for handling the SMTP dot-handling protocol, flagging to apply to headers as
2939 well as body. Set the appropriate timeout value to be used for each chunk.
2940 (Haven't been able to make it work using select() for writing yet.) */
2941
2942 if (!(sx.peer_offered & OPTION_CHUNKING) && !sx.ok)
2943 {
2944 /* Save the first address of the next batch. */
2945 sx.first_addr = sx.next_addr;
2946
2947 sx.ok = TRUE;
2948 }
2949 else
2950 {
2951 transport_ctx tctx = {
2952 {sx.inblock.sock},
2953 tblock,
2954 addrlist,
2955 US".", US"..", /* Escaping strings */
2956 topt_use_crlf | topt_escape_headers
2957 | (tblock->body_only ? topt_no_headers : 0)
2958 | (tblock->headers_only ? topt_no_body : 0)
2959 | (tblock->return_path_add ? topt_add_return_path : 0)
2960 | (tblock->delivery_date_add ? topt_add_delivery_date : 0)
2961 | (tblock->envelope_to_add ? topt_add_envelope_to : 0)
2962 };
2963
2964 /* If using CHUNKING we need a callback from the generic transport
2965 support to us, for the sending of BDAT smtp commands and the reaping
2966 of responses. The callback needs a whole bunch of state so set up
2967 a transport-context structure to be passed around. */
2968
2969 if (sx.peer_offered & OPTION_CHUNKING)
2970 {
2971 tctx.check_string = tctx.escape_string = NULL;
2972 tctx.options |= topt_use_bdat;
2973 tctx.chunk_cb = smtp_chunk_cmd_callback;
2974 sx.pending_BDAT = FALSE;
2975 sx.good_RCPT = sx.ok;
2976 sx.cmd_count = 0;
2977 tctx.smtp_context = &sx;
2978 }
2979 else
2980 tctx.options |= topt_end_dot;
2981
2982 /* Save the first address of the next batch. */
2983 sx.first_addr = sx.next_addr;
2984
2985 /* Responses from CHUNKING commands go in buffer. Otherwise,
2986 there has not been a response. */
2987
2988 sx.buffer[0] = 0;
2989
2990 sigalrm_seen = FALSE;
2991 transport_write_timeout = sx.ob->data_timeout;
2992 smtp_command = US"sending data block"; /* For error messages */
2993 DEBUG(D_transport|D_v)
2994 if (sx.peer_offered & OPTION_CHUNKING)
2995 debug_printf(" will write message using CHUNKING\n");
2996 else
2997 debug_printf(" SMTP>> writing message and terminating \".\"\n");
2998 transport_count = 0;
2999
3000 #ifndef DISABLE_DKIM
3001 dkim_exim_sign_init();
3002 # ifdef EXPERIMENTAL_ARC
3003 {
3004 uschar * s = sx.ob->arc_sign;
3005 if (s)
3006 {
3007 if (!(sx.ob->dkim.arc_signspec = expand_string(s)))
3008 {
3009 message = US"failed to expand arc_sign";
3010 sx.ok = FALSE;
3011 goto SEND_FAILED;
3012 }
3013 /* Ask dkim code to hash the body for ARC */
3014 (void) arc_ams_setup_sign_bodyhash();
3015 sx.ob->dkim.force_bodyhash = TRUE;
3016 }
3017 }
3018 # endif
3019 sx.ok = dkim_transport_write_message(&tctx, &sx.ob->dkim, CUSS &message);
3020 #else
3021 sx.ok = transport_write_message(&tctx, 0);
3022 #endif
3023
3024 /* transport_write_message() uses write() because it is called from other
3025 places to write to non-sockets. This means that under some OS (e.g. Solaris)
3026 it can exit with "Broken pipe" as its error. This really means that the
3027 socket got closed at the far end. */
3028
3029 transport_write_timeout = 0; /* for subsequent transports */
3030
3031 /* Failure can either be some kind of I/O disaster (including timeout),
3032 or the failure of a transport filter or the expansion of added headers.
3033 Or, when CHUNKING, it can be a protocol-detected failure. */
3034
3035 if (!sx.ok)
3036 if (message) goto SEND_FAILED;
3037 else goto RESPONSE_FAILED;
3038
3039 /* We used to send the terminating "." explicitly here, but because of
3040 buffering effects at both ends of TCP/IP connections, you don't gain
3041 anything by keeping it separate, so it might as well go in the final
3042 data buffer for efficiency. This is now done by setting the topt_end_dot
3043 flag above. */
3044
3045 smtp_command = US"end of data";
3046
3047 if (sx.peer_offered & OPTION_CHUNKING && sx.cmd_count > 1)
3048 {
3049 /* Reap any outstanding MAIL & RCPT commands, but not a DATA-go-ahead */
3050 switch(sync_responses(&sx, sx.cmd_count-1, 0))
3051 {
3052 case 3: sx.ok = TRUE; /* 2xx & 5xx => OK & progress made */
3053 case 2: sx.completed_addr = TRUE; /* 5xx (only) => progress made */
3054 break;
3055
3056 case 1: sx.ok = TRUE; /* 2xx (only) => OK, but if LMTP, */
3057 if (!sx.lmtp) sx.completed_addr = TRUE; /* can't tell about progress yet */
3058 case 0: break; /* No 2xx or 5xx, but no probs */
3059
3060 case -1: goto END_OFF; /* Timeout on RCPT */
3061 default: goto RESPONSE_FAILED; /* I/O error, or any MAIL/DATA error */
3062 }
3063 }
3064
3065 #ifndef DISABLE_PRDR
3066 /* For PRDR we optionally get a partial-responses warning
3067 * followed by the individual responses, before going on with
3068 * the overall response. If we don't get the warning then deal
3069 * with per non-PRDR. */
3070 if(sx.prdr_active)
3071 {
3072 sx.ok = smtp_read_response(&sx.inblock, sx.buffer, sizeof(sx.buffer), '3',
3073 sx.ob->final_timeout);
3074 if (!sx.ok && errno == 0) switch(sx.buffer[0])
3075 {
3076 case '2': sx.prdr_active = FALSE;
3077 sx.ok = TRUE;
3078 break;
3079 case '4': errno = ERRNO_DATA4XX;
3080 addrlist->more_errno |=
3081 ((sx.buffer[1] - '0')*10 + sx.buffer[2] - '0') << 8;
3082 break;
3083 }
3084 }
3085 else
3086 #endif
3087
3088 /* For non-PRDR SMTP, we now read a single response that applies to the
3089 whole message. If it is OK, then all the addresses have been delivered. */
3090
3091 if (!sx.lmtp)
3092 {
3093 sx.ok = smtp_read_response(&sx.inblock, sx.buffer, sizeof(sx.buffer), '2',
3094 sx.ob->final_timeout);
3095 if (!sx.ok && errno == 0 && sx.buffer[0] == '4')
3096 {
3097 errno = ERRNO_DATA4XX;
3098 addrlist->more_errno |= ((sx.buffer[1] - '0')*10 + sx.buffer[2] - '0') << 8;
3099 }
3100 }
3101
3102 /* For LMTP, we get back a response for every RCPT command that we sent;
3103 some may be accepted and some rejected. For those that get a response, their
3104 status is fixed; any that are accepted have been handed over, even if later
3105 responses crash - at least, that's how I read RFC 2033.
3106
3107 If all went well, mark the recipient addresses as completed, record which
3108 host/IPaddress they were delivered to, and cut out RSET when sending another
3109 message down the same channel. Write the completed addresses to the journal
3110 now so that they are recorded in case there is a crash of hardware or
3111 software before the spool gets updated. Also record the final SMTP
3112 confirmation if needed (for SMTP only). */
3113
3114 if (sx.ok)
3115 {
3116 int flag = '=';
3117 struct timeval delivery_time;
3118 int len;
3119 uschar * conf = NULL;
3120
3121 timesince(&delivery_time, &start_delivery_time);
3122 sx.send_rset = FALSE;
3123 pipelining_active = FALSE;
3124
3125 /* Set up confirmation if needed - applies only to SMTP */
3126
3127 if (
3128 #ifdef DISABLE_EVENT
3129 LOGGING(smtp_confirmation) &&
3130 #endif
3131 !sx.lmtp
3132 )
3133 {
3134 const uschar *s = string_printing(sx.buffer);
3135 /* deconst cast ok here as string_printing was checked to have alloc'n'copied */
3136 conf = (s == sx.buffer)? US string_copy(s) : US s;
3137 }
3138
3139 /* Process all transported addresses - for LMTP or PRDR, read a status for
3140 each one. */
3141
3142 for (addr = addrlist; addr != sx.first_addr; addr = addr->next)
3143 {
3144 if (addr->transport_return != PENDING_OK) continue;
3145
3146 /* LMTP - if the response fails badly (e.g. timeout), use it for all the
3147 remaining addresses. Otherwise, it's a return code for just the one
3148 address. For temporary errors, add a retry item for the address so that
3149 it doesn't get tried again too soon. */
3150
3151 #ifndef DISABLE_PRDR
3152 if (sx.lmtp || sx.prdr_active)
3153 #else
3154 if (sx.lmtp)
3155 #endif
3156 {
3157 if (!smtp_read_response(&sx.inblock, sx.buffer, sizeof(sx.buffer), '2',
3158 sx.ob->final_timeout))
3159 {
3160 if (errno != 0 || sx.buffer[0] == 0) goto RESPONSE_FAILED;
3161 addr->message = string_sprintf(
3162 #ifndef DISABLE_PRDR
3163 "%s error after %s: %s", sx.prdr_active ? "PRDR":"LMTP",
3164 #else
3165 "LMTP error after %s: %s",
3166 #endif
3167 data_command, string_printing(sx.buffer));
3168 setflag(addr, af_pass_message); /* Allow message to go to user */
3169 if (sx.buffer[0] == '5')
3170 addr->transport_return = FAIL;
3171 else
3172 {
3173 errno = ERRNO_DATA4XX;
3174 addr->more_errno |= ((sx.buffer[1] - '0')*10 + sx.buffer[2] - '0') << 8;
3175 addr->transport_return = DEFER;
3176 #ifndef DISABLE_PRDR
3177 if (!sx.prdr_active)
3178 #endif
3179 retry_add_item(addr, addr->address_retry_key, 0);
3180 }
3181 continue;
3182 }
3183 sx.completed_addr = TRUE; /* NOW we can set this flag */
3184 if (LOGGING(smtp_confirmation))
3185 {
3186 const uschar *s = string_printing(sx.buffer);
3187 /* deconst cast ok here as string_printing was checked to have alloc'n'copied */
3188 conf = (s == sx.buffer) ? US string_copy(s) : US s;
3189 }
3190 }
3191
3192 /* SMTP, or success return from LMTP for this address. Pass back the
3193 actual host that was used. */
3194
3195 addr->transport_return = OK;
3196 addr->more_errno = delivery_time.tv_sec;
3197 addr->delivery_usec = delivery_time.tv_usec;
3198 addr->host_used = host;
3199 addr->special_action = flag;
3200 addr->message = conf;
3201 #ifndef DISABLE_PRDR
3202 if (sx.prdr_active) setflag(addr, af_prdr_used);
3203 #endif
3204 if (sx.peer_offered & OPTION_CHUNKING) setflag(addr, af_chunking_used);
3205 flag = '-';
3206
3207 #ifndef DISABLE_PRDR
3208 if (!sx.prdr_active)
3209 #endif
3210 {
3211 /* Update the journal. For homonymic addresses, use the base address plus
3212 the transport name. See lots of comments in deliver.c about the reasons
3213 for the complications when homonyms are involved. Just carry on after
3214 write error, as it may prove possible to update the spool file later. */
3215
3216 if (testflag(addr, af_homonym))
3217 sprintf(CS sx.buffer, "%.500s/%s\n", addr->unique + 3, tblock->name);
3218 else
3219 sprintf(CS sx.buffer, "%.500s\n", addr->unique);
3220
3221 DEBUG(D_deliver) debug_printf("S:journalling %s\n", sx.buffer);
3222 len = Ustrlen(CS sx.buffer);
3223 if (write(journal_fd, sx.buffer, len) != len)
3224 log_write(0, LOG_MAIN|LOG_PANIC, "failed to write journal for "
3225 "%s: %s", sx.buffer, strerror(errno));
3226 }
3227 }
3228
3229 #ifndef DISABLE_PRDR
3230 if (sx.prdr_active)
3231 {
3232 const uschar * overall_message;
3233
3234 /* PRDR - get the final, overall response. For any non-success
3235 upgrade all the address statuses. */
3236
3237 sx.ok = smtp_read_response(&sx.inblock, sx.buffer, sizeof(sx.buffer), '2',
3238 sx.ob->final_timeout);
3239 if (!sx.ok)
3240 {
3241 if(errno == 0 && sx.buffer[0] == '4')
3242 {
3243 errno = ERRNO_DATA4XX;
3244 addrlist->more_errno |= ((sx.buffer[1] - '0')*10 + sx.buffer[2] - '0') << 8;
3245 }
3246 for (addr = addrlist; addr != sx.first_addr; addr = addr->next)
3247 if (sx.buffer[0] == '5' || addr->transport_return == OK)
3248 addr->transport_return = PENDING_OK; /* allow set_errno action */
3249 goto RESPONSE_FAILED;
3250 }
3251
3252 /* Append the overall response to the individual PRDR response for logging
3253 and update the journal, or setup retry. */
3254
3255 overall_message = string_printing(sx.buffer);
3256 for (addr = addrlist; addr != sx.first_addr; addr = addr->next)
3257 if (addr->transport_return == OK)
3258 addr->message = string_sprintf("%s\\n%s", addr->message, overall_message);
3259
3260 for (addr = addrlist; addr != sx.first_addr; addr = addr->next)
3261 if (addr->transport_return == OK)
3262 {
3263 if (testflag(addr, af_homonym))
3264 sprintf(CS sx.buffer, "%.500s/%s\n", addr->unique + 3, tblock->name);
3265 else
3266 sprintf(CS sx.buffer, "%.500s\n", addr->unique);
3267
3268 DEBUG(D_deliver) debug_printf("journalling(PRDR) %s\n", sx.buffer);
3269 len = Ustrlen(CS sx.buffer);
3270 if (write(journal_fd, sx.buffer, len) != len)
3271 log_write(0, LOG_MAIN|LOG_PANIC, "failed to write journal for "
3272 "%s: %s", sx.buffer, strerror(errno));
3273 }
3274 else if (addr->transport_return == DEFER)
3275 retry_add_item(addr, addr->address_retry_key, -2);
3276 }
3277 #endif
3278
3279 /* Ensure the journal file is pushed out to disk. */
3280
3281 if (EXIMfsync(journal_fd) < 0)
3282 log_write(0, LOG_MAIN|LOG_PANIC, "failed to fsync journal: %s",
3283 strerror(errno));
3284 }
3285 }
3286
3287
3288 /* Handle general (not specific to one address) failures here. The value of ok
3289 is used to skip over this code on the falling through case. A timeout causes a
3290 deferral. Other errors may defer or fail according to the response code, and
3291 may set up a special errno value, e.g. after connection chopped, which is
3292 assumed if errno == 0 and there is no text in the buffer. If control reaches
3293 here during the setting up phase (i.e. before MAIL FROM) then always defer, as
3294 the problem is not related to this specific message. */
3295
3296 if (!sx.ok)
3297 {
3298 int code, set_rc;
3299 uschar * set_message;
3300
3301 RESPONSE_FAILED:
3302 {
3303 save_errno = errno;
3304 message = NULL;
3305 sx.send_quit = check_response(host, &save_errno, addrlist->more_errno,
3306 sx.buffer, &code, &message, &pass_message);
3307 goto FAILED;
3308 }
3309
3310 SEND_FAILED:
3311 {
3312 save_errno = errno;
3313 code = '4';
3314 message = string_sprintf("send() to %s [%s] failed: %s",
3315 host->name, host->address, message ? message : US strerror(save_errno));
3316 sx.send_quit = FALSE;
3317 goto FAILED;
3318 }
3319
3320 FAILED:
3321 {
3322 BOOL message_error;
3323
3324 sx.ok = FALSE; /* For when reached by GOTO */
3325 set_message = message;
3326
3327 /* We want to handle timeouts after MAIL or "." and loss of connection after
3328 "." specially. They can indicate a problem with the sender address or with
3329 the contents of the message rather than a real error on the connection. These
3330 cases are treated in the same way as a 4xx response. This next bit of code
3331 does the classification. */
3332
3333 switch(save_errno)
3334 {
3335 case 0:
3336 case ERRNO_MAIL4XX:
3337 case ERRNO_DATA4XX:
3338 message_error = TRUE;
3339 break;
3340
3341 case ETIMEDOUT:
3342 message_error = Ustrncmp(smtp_command,"MAIL",4) == 0 ||
3343 Ustrncmp(smtp_command,"end ",4) == 0;
3344 break;
3345
3346 case ERRNO_SMTPCLOSED:
3347 message_error = Ustrncmp(smtp_command,"end ",4) == 0;
3348 break;
3349
3350 default:
3351 message_error = FALSE;
3352 break;
3353 }
3354
3355 /* Handle the cases that are treated as message errors. These are:
3356
3357 (a) negative response or timeout after MAIL
3358 (b) negative response after DATA
3359 (c) negative response or timeout or dropped connection after "."
3360 (d) utf8 support required and not offered
3361
3362 It won't be a negative response or timeout after RCPT, as that is dealt
3363 with separately above. The action in all cases is to set an appropriate
3364 error code for all the addresses, but to leave yield set to OK because the
3365 host itself has not failed. Of course, it might in practice have failed
3366 when we've had a timeout, but if so, we'll discover that at the next
3367 delivery attempt. For a temporary error, set the message_defer flag, and
3368 write to the logs for information if this is not the last host. The error
3369 for the last host will be logged as part of the address's log line. */
3370
3371 if (message_error)
3372 {
3373 if (mua_wrapper) code = '5'; /* Force hard failure in wrapper mode */
3374
3375 /* If there's an errno, the message contains just the identity of
3376 the host. */
3377
3378 if (code == '5')
3379 set_rc = FAIL;
3380 else /* Anything other than 5 is treated as temporary */
3381 {
3382 set_rc = DEFER;
3383 if (save_errno > 0)
3384 message = US string_sprintf("%s: %s", message, strerror(save_errno));
3385
3386 write_logs(host, message, sx.first_addr ? sx.first_addr->basic_errno : 0);
3387
3388 *message_defer = TRUE;
3389 }
3390 }
3391
3392 /* Otherwise, we have an I/O error or a timeout other than after MAIL or
3393 ".", or some other transportation error. We defer all addresses and yield
3394 DEFER, except for the case of failed add_headers expansion, or a transport
3395 filter failure, when the yield should be ERROR, to stop it trying other
3396 hosts. */
3397
3398 else
3399 {
3400 set_rc = DEFER;
3401 yield = (save_errno == ERRNO_CHHEADER_FAIL ||
3402 save_errno == ERRNO_FILTER_FAIL)? ERROR : DEFER;
3403 }
3404 }
3405
3406 set_errno(addrlist, save_errno, set_message, set_rc, pass_message, host
3407 #ifdef EXPERIMENTAL_DSN_INFO
3408 , sx.smtp_greeting, sx.helo_response
3409 #endif
3410 );
3411 }
3412
3413
3414 /* If all has gone well, send_quit will be set TRUE, implying we can end the
3415 SMTP session tidily. However, if there were too many addresses to send in one
3416 message (indicated by first_addr being non-NULL) we want to carry on with the
3417 rest of them. Also, it is desirable to send more than one message down the SMTP
3418 connection if there are several waiting, provided we haven't already sent so
3419 many as to hit the configured limit. The function transport_check_waiting looks
3420 for a waiting message and returns its id. Then transport_pass_socket tries to
3421 set up a continued delivery by passing the socket on to another process. The
3422 variable send_rset is FALSE if a message has just been successfully transfered.
3423
3424 If we are already sending down a continued channel, there may be further
3425 addresses not yet delivered that are aimed at the same host, but which have not
3426 been passed in this run of the transport. In this case, continue_more will be
3427 true, and all we should do is send RSET if necessary, and return, leaving the
3428 channel open.
3429
3430 However, if no address was disposed of, i.e. all addresses got 4xx errors, we
3431 do not want to continue with other messages down the same channel, because that
3432 can lead to looping between two or more messages, all with the same,
3433 temporarily failing address(es). [The retry information isn't updated yet, so
3434 new processes keep on trying.] We probably also don't want to try more of this
3435 message's addresses either.
3436
3437 If we have started a TLS session, we have to end it before passing the
3438 connection to a new process. However, not all servers can handle this (Exim
3439 can), so we do not pass such a connection on if the host matches
3440 hosts_nopass_tls. */
3441
3442 DEBUG(D_transport)
3443 debug_printf("ok=%d send_quit=%d send_rset=%d continue_more=%d "
3444 "yield=%d first_address is %sNULL\n", sx.ok, sx.send_quit,
3445 sx.send_rset, continue_more, yield, sx.first_addr ? "not " : "");
3446
3447 if (sx.completed_addr && sx.ok && sx.send_quit)
3448 {
3449 BOOL more;
3450 smtp_compare_t t_compare;
3451
3452 t_compare.tblock = tblock;
3453 t_compare.current_sender_address = sender_address;
3454
3455 if ( sx.first_addr != NULL
3456 || continue_more
3457 || (
3458 #ifdef SUPPORT_TLS
3459 ( tls_out.active < 0 && !continue_proxy_cipher
3460 || verify_check_given_host(&sx.ob->hosts_nopass_tls, host) != OK
3461 )
3462 &&
3463 #endif
3464 transport_check_waiting(tblock->name, host->name,
3465 tblock->connection_max_messages, new_message_id, &more,
3466 (oicf)smtp_are_same_identities, (void*)&t_compare)
3467 ) )
3468 {
3469 uschar *msg;
3470 BOOL pass_message;
3471
3472 if (sx.send_rset)
3473 if (! (sx.ok = smtp_write_command(&sx.outblock, SCMD_FLUSH, "RSET\r\n") >= 0))
3474 {
3475 msg = US string_sprintf("send() to %s [%s] failed: %s", host->name,
3476 host->address, strerror(errno));
3477 sx.send_quit = FALSE;
3478 }
3479 else if (! (sx.ok = smtp_read_response(&sx.inblock, sx.buffer,
3480 sizeof(sx.buffer), '2', sx.ob->command_timeout)))
3481 {
3482 int code;
3483 sx.send_quit = check_response(host, &errno, 0, sx.buffer, &code, &msg,
3484 &pass_message);
3485 if (!sx.send_quit)
3486 {
3487 DEBUG(D_transport) debug_printf("H=%s [%s] %s\n",
3488 host->name, host->address, msg);
3489 }
3490 }
3491
3492 /* Either RSET was not needed, or it succeeded */
3493
3494 if (sx.ok)
3495 {
3496 int pfd[2];
3497 int socket_fd = sx.inblock.sock;
3498
3499
3500 if (sx.first_addr != NULL) /* More addresses still to be sent */
3501 { /* in this run of the transport */
3502 continue_sequence++; /* Causes * in logging */
3503 goto SEND_MESSAGE;
3504 }
3505
3506 /* Unless caller said it already has more messages listed for this host,
3507 pass the connection on to a new Exim process (below, the call to
3508 transport_pass_socket). If the caller has more ready, just return with
3509 the connection still open. */
3510
3511 #ifdef SUPPORT_TLS
3512 if (tls_out.active >= 0)
3513 if ( continue_more
3514 || verify_check_given_host(&sx.ob->hosts_noproxy_tls, host) == OK)
3515 {
3516 /* Before passing the socket on, or returning to caller with it still
3517 open, we must shut down TLS. Not all MTAs allow for the continuation
3518 of the SMTP session when TLS is shut down. We test for this by sending
3519 a new EHLO. If we don't get a good response, we don't attempt to pass
3520 the socket on. */
3521
3522 tls_close(FALSE, TLS_SHUTDOWN_WAIT);
3523 smtp_peer_options = smtp_peer_options_wrap;
3524 sx.ok = !sx.smtps
3525 && smtp_write_command(&sx.outblock, SCMD_FLUSH,
3526 "EHLO %s\r\n", sx.helo_data) >= 0
3527 && smtp_read_response(&sx.inblock, sx.buffer, sizeof(sx.buffer),
3528 '2', sx.ob->command_timeout);
3529
3530 if (sx.ok && continue_more)
3531 return yield; /* More addresses for another run */
3532 }
3533 else
3534 {
3535 /* Set up a pipe for proxying TLS for the new transport process */
3536
3537 smtp_peer_options |= OPTION_TLS;
3538 if (sx.ok = (socketpair(AF_UNIX, SOCK_STREAM, 0, pfd) == 0))
3539 socket_fd = pfd[1];
3540 else
3541 set_errno(sx.first_addr, errno, US"internal allocation problem",
3542 DEFER, FALSE, host
3543 # ifdef EXPERIMENTAL_DSN_INFO
3544 , sx.smtp_greeting, sx.helo_response
3545 # endif
3546 );
3547 }
3548 else
3549 #endif
3550 if (continue_more)
3551 return yield; /* More addresses for another run */
3552
3553 /* If the socket is successfully passed, we mustn't send QUIT (or
3554 indeed anything!) from here. */
3555
3556 /*XXX DSN_INFO: assume likely to do new HELO; but for greet we'll want to
3557 propagate it from the initial
3558 */
3559 if (sx.ok && transport_pass_socket(tblock->name, host->name,
3560 host->address, new_message_id, socket_fd))
3561 {
3562 sx.send_quit = FALSE;
3563
3564 /* We have passed the client socket to a fresh transport process.
3565 If TLS is still active, we need to proxy it for the transport we
3566 just passed the baton to. Fork a child to to do it, and return to
3567 get logging done asap. Which way to place the work makes assumptions
3568 about post-fork prioritisation which may not hold on all platforms. */
3569 #ifdef SUPPORT_TLS
3570 if (tls_out.active >= 0)
3571 {
3572 int pid = fork();
3573 if (pid == 0) /* child; fork again to disconnect totally */
3574 {
3575 if (running_in_test_harness) millisleep(100); /* let parent debug out */
3576 /* does not return */
3577 smtp_proxy_tls(sx.buffer, sizeof(sx.buffer), pfd,
3578 sx.ob->command_timeout);
3579 }
3580
3581 if (pid > 0) /* parent */
3582 {
3583 DEBUG(D_transport) debug_printf("proxy-proc inter-pid %d\n", pid);
3584 close(pfd[0]);
3585 /* tidy the inter-proc to disconn the proxy proc */
3586 waitpid(pid, NULL, 0);
3587 tls_close(FALSE, TLS_NO_SHUTDOWN);
3588 (void)close(sx.inblock.sock);
3589 continue_transport = NULL;
3590 continue_hostname = NULL;
3591 return yield;
3592 }
3593 log_write(0, LOG_PANIC_DIE, "fork failed");
3594 }
3595 #endif
3596 }
3597 }
3598
3599 /* If RSET failed and there are addresses left, they get deferred. */
3600 else
3601 set_errno(sx.first_addr, errno, msg, DEFER, FALSE, host
3602 #ifdef EXPERIMENTAL_DSN_INFO
3603 , sx.smtp_greeting, sx.helo_response
3604 #endif
3605 );
3606 }
3607 }
3608
3609 /* End off tidily with QUIT unless the connection has died or the socket has
3610 been passed to another process. There has been discussion on the net about what
3611 to do after sending QUIT. The wording of the RFC suggests that it is necessary
3612 to wait for a response, but on the other hand, there isn't anything one can do
3613 with an error response, other than log it. Exim used to do that. However,
3614 further discussion suggested that it is positively advantageous not to wait for
3615 the response, but to close the session immediately. This is supposed to move
3616 the TCP/IP TIME_WAIT state from the server to the client, thereby removing some
3617 load from the server. (Hosts that are both servers and clients may not see much
3618 difference, of course.) Further discussion indicated that this was safe to do
3619 on Unix systems which have decent implementations of TCP/IP that leave the
3620 connection around for a while (TIME_WAIT) after the application has gone away.
3621 This enables the response sent by the server to be properly ACKed rather than
3622 timed out, as can happen on broken TCP/IP implementations on other OS.
3623
3624 This change is being made on 31-Jul-98. After over a year of trouble-free
3625 operation, the old commented-out code was removed on 17-Sep-99. */
3626
3627 SEND_QUIT:
3628 if (sx.send_quit) (void)smtp_write_command(&sx.outblock, SCMD_FLUSH, "QUIT\r\n");
3629
3630 END_OFF:
3631
3632 #ifdef SUPPORT_TLS
3633 tls_close(FALSE, TLS_SHUTDOWN_NOWAIT);
3634 #endif
3635
3636 /* Close the socket, and return the appropriate value, first setting
3637 works because the NULL setting is passed back to the calling process, and
3638 remote_max_parallel is forced to 1 when delivering over an existing connection,
3639
3640 If all went well and continue_more is set, we shouldn't actually get here if
3641 there are further addresses, as the return above will be taken. However,
3642 writing RSET might have failed, or there may be other addresses whose hosts are
3643 specified in the transports, and therefore not visible at top level, in which
3644 case continue_more won't get set. */
3645
3646 HDEBUG(D_transport|D_acl|D_v) debug_printf_indent(" SMTP(close)>>\n");
3647 if (sx.send_quit)
3648 {
3649 shutdown(sx.outblock.sock, SHUT_WR);
3650 if (fcntl(sx.inblock.sock, F_SETFL, O_NONBLOCK) == 0)
3651 for (rc = 16; read(sx.inblock.sock, sx.inbuffer, sizeof(sx.inbuffer)) > 0 && rc > 0;)
3652 rc--; /* drain socket */
3653 }
3654 (void)close(sx.inblock.sock);
3655
3656 #ifndef DISABLE_EVENT
3657 (void) event_raise(tblock->event_action, US"tcp:close", NULL);
3658 #endif
3659
3660 continue_transport = NULL;
3661 continue_hostname = NULL;
3662 return yield;
3663 }
3664
3665
3666
3667
3668 /*************************************************
3669 * Closedown entry point *
3670 *************************************************/
3671
3672 /* This function is called when exim is passed an open smtp channel
3673 from another incarnation, but the message which it has been asked
3674 to deliver no longer exists. The channel is on stdin.
3675
3676 We might do fancy things like looking for another message to send down
3677 the channel, but if the one we sought has gone, it has probably been
3678 delivered by some other process that itself will seek further messages,
3679 so just close down our connection.
3680
3681 Argument: pointer to the transport instance block
3682 Returns: nothing
3683 */
3684
3685 void
3686 smtp_transport_closedown(transport_instance *tblock)
3687 {
3688 smtp_transport_options_block *ob =
3689 (smtp_transport_options_block *)tblock->options_block;
3690 smtp_inblock inblock;
3691 smtp_outblock outblock;
3692 uschar buffer[256];
3693 uschar inbuffer[4096];
3694 uschar outbuffer[16];
3695
3696 inblock.sock = fileno(stdin);
3697 inblock.buffer = inbuffer;
3698 inblock.buffersize = sizeof(inbuffer);
3699 inblock.ptr = inbuffer;
3700 inblock.ptrend = inbuffer;
3701
3702 outblock.sock = inblock.sock;
3703 outblock.buffersize = sizeof(outbuffer);
3704 outblock.buffer = outbuffer;
3705 outblock.ptr = outbuffer;
3706 outblock.cmd_count = 0;
3707 outblock.authenticating = FALSE;
3708
3709 (void)smtp_write_command(&outblock, SCMD_FLUSH, "QUIT\r\n");
3710 (void)smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
3711 ob->command_timeout);
3712 (void)close(inblock.sock);
3713 }
3714
3715
3716
3717 /*************************************************
3718 * Prepare addresses for delivery *
3719 *************************************************/
3720
3721 /* This function is called to flush out error settings from previous delivery
3722 attempts to other hosts. It also records whether we got here via an MX record
3723 or not in the more_errno field of the address. We are interested only in
3724 addresses that are still marked DEFER - others may have got delivered to a
3725 previously considered IP address. Set their status to PENDING_DEFER to indicate
3726 which ones are relevant this time.
3727
3728 Arguments:
3729 addrlist the list of addresses
3730 host the host we are delivering to
3731
3732 Returns: the first address for this delivery
3733 */
3734
3735 static address_item *
3736 prepare_addresses(address_item *addrlist, host_item *host)
3737 {
3738 address_item *first_addr = NULL;
3739 address_item *addr;
3740 for (addr = addrlist; addr; addr = addr->next)
3741 if (addr->transport_return == DEFER)
3742 {
3743 if (!first_addr) first_addr = addr;
3744 addr->transport_return = PENDING_DEFER;
3745 addr->basic_errno = 0;
3746 addr->more_errno = (host->mx >= 0)? 'M' : 'A';
3747 addr->message = NULL;
3748 #ifdef SUPPORT_TLS
3749 addr->cipher = NULL;
3750 addr->ourcert = NULL;
3751 addr->peercert = NULL;
3752 addr->peerdn = NULL;
3753 addr->ocsp = OCSP_NOT_REQ;
3754 #endif
3755 #ifdef EXPERIMENTAL_DSN_INFO
3756 addr->smtp_greeting = NULL;
3757 addr->helo_response = NULL;
3758 #endif
3759 }
3760 return first_addr;
3761 }
3762
3763
3764
3765 /*************************************************
3766 * Main entry point *
3767 *************************************************/
3768
3769 /* See local README for interface details. As this is a remote transport, it is
3770 given a chain of addresses to be delivered in one connection, if possible. It
3771 always returns TRUE, indicating that each address has its own independent
3772 status set, except if there is a setting up problem, in which case it returns
3773 FALSE. */
3774
3775 BOOL
3776 smtp_transport_entry(
3777 transport_instance *tblock, /* data for this instantiation */
3778 address_item *addrlist) /* addresses we are working on */
3779 {
3780 int cutoff_retry;
3781 int defport;
3782 int hosts_defer = 0;
3783 int hosts_fail = 0;
3784 int hosts_looked_up = 0;
3785 int hosts_retry = 0;
3786 int hosts_serial = 0;
3787 int hosts_total = 0;
3788 int total_hosts_tried = 0;
3789 address_item *addr;
3790 BOOL expired = TRUE;
3791 uschar *expanded_hosts = NULL;
3792 uschar *pistring;
3793 uschar *tid = string_sprintf("%s transport", tblock->name);
3794 smtp_transport_options_block *ob =
3795 (smtp_transport_options_block *)(tblock->options_block);
3796 host_item *hostlist = addrlist->host_list;
3797 host_item *host;
3798
3799 DEBUG(D_transport)
3800 {
3801 debug_printf("%s transport entered\n", tblock->name);
3802 for (addr = addrlist; addr; addr = addr->next)
3803 debug_printf(" %s\n", addr->address);
3804 if (hostlist)
3805 {
3806 debug_printf("hostlist:\n");
3807 for (host = hostlist; host; host = host->next)
3808 debug_printf(" '%s' IP %s port %d\n", host->name, host->address, host->port);
3809 }
3810 if (continue_hostname)
3811 debug_printf("already connected to %s [%s] (on fd %d)\n",
3812 continue_hostname, continue_host_address,
3813 cutthrough.fd >= 0 ? cutthrough.fd : 0);
3814 }
3815
3816 /* Set the flag requesting that these hosts be added to the waiting
3817 database if the delivery fails temporarily or if we are running with
3818 queue_smtp or a 2-stage queue run. This gets unset for certain
3819 kinds of error, typically those that are specific to the message. */
3820
3821 update_waiting = TRUE;
3822
3823 /* If a host list is not defined for the addresses - they must all have the
3824 same one in order to be passed to a single transport - or if the transport has
3825 a host list with hosts_override set, use the host list supplied with the
3826 transport. It is an error for this not to exist. */
3827
3828 if (!hostlist || (ob->hosts_override && ob->hosts))
3829 {
3830 if (!ob->hosts)
3831 {
3832 addrlist->message = string_sprintf("%s transport called with no hosts set",
3833 tblock->name);
3834 addrlist->transport_return = PANIC;
3835 return FALSE; /* Only top address has status */
3836 }
3837
3838 DEBUG(D_transport) debug_printf("using the transport's hosts: %s\n",
3839 ob->hosts);
3840
3841 /* If the transport's host list contains no '$' characters, and we are not
3842 randomizing, it is fixed and therefore a chain of hosts can be built once
3843 and for all, and remembered for subsequent use by other calls to this
3844 transport. If, on the other hand, the host list does contain '$', or we are
3845 randomizing its order, we have to rebuild it each time. In the fixed case,
3846 as the hosts string will never be used again, it doesn't matter that we
3847 replace all the : characters with zeros. */
3848
3849 if (!ob->hostlist)
3850 {
3851 uschar *s = ob->hosts;
3852
3853 if (Ustrchr(s, '$') != NULL)
3854 {
3855 if (!(expanded_hosts = expand_string(s)))
3856 {
3857 addrlist->message = string_sprintf("failed to expand list of hosts "
3858 "\"%s\" in %s transport: %s", s, tblock->name, expand_string_message);
3859 addrlist->transport_return = search_find_defer ? DEFER : PANIC;
3860 return FALSE; /* Only top address has status */
3861 }
3862 DEBUG(D_transport) debug_printf("expanded list of hosts \"%s\" to "
3863 "\"%s\"\n", s, expanded_hosts);
3864 s = expanded_hosts;
3865 }
3866 else
3867 if (ob->hosts_randomize) s = expanded_hosts = string_copy(s);
3868
3869 host_build_hostlist(&hostlist, s, ob->hosts_randomize);
3870
3871 /* Check that the expansion yielded something useful. */
3872 if (!hostlist)
3873 {
3874 addrlist->message =
3875 string_sprintf("%s transport has empty hosts setting", tblock->name);
3876 addrlist->transport_return = PANIC;
3877 return FALSE; /* Only top address has status */
3878 }
3879
3880 /* If there was no expansion of hosts, save the host list for
3881 next time. */
3882
3883 if (!expanded_hosts) ob->hostlist = hostlist;
3884 }
3885
3886 /* This is not the first time this transport has been run in this delivery;
3887 the host list was built previously. */
3888
3889 else
3890 hostlist = ob->hostlist;
3891 }
3892
3893 /* The host list was supplied with the address. If hosts_randomize is set, we
3894 must sort it into a random order if it did not come from MX records and has not
3895 already been randomized (but don't bother if continuing down an existing
3896 connection). */
3897
3898 else if (ob->hosts_randomize && hostlist->mx == MX_NONE && !continue_hostname)
3899 {
3900 host_item *newlist = NULL;
3901 while (hostlist)
3902 {
3903 host_item *h = hostlist;
3904 hostlist = hostlist->next;
3905
3906 h->sort_key = random_number(100);
3907
3908 if (!newlist)
3909 {
3910 h->next = NULL;
3911 newlist = h;
3912 }
3913 else if (h->sort_key < newlist->sort_key)
3914 {
3915 h->next = newlist;
3916 newlist = h;
3917 }
3918 else
3919 {
3920 host_item *hh = newlist;
3921 while (hh->next)
3922 {
3923 if (h->sort_key < hh->next->sort_key) break;
3924 hh = hh->next;
3925 }
3926 h->next = hh->next;
3927 hh->next = h;
3928 }
3929 }
3930
3931 hostlist = addrlist->host_list = newlist;
3932 }
3933
3934 /* Sort out the default port. */
3935
3936 if (!smtp_get_port(ob->port, addrlist, &defport, tid)) return FALSE;
3937
3938 /* For each host-plus-IP-address on the list:
3939
3940 . If this is a continued delivery and the host isn't the one with the
3941 current connection, skip.
3942
3943 . If the status is unusable (i.e. previously failed or retry checked), skip.
3944
3945 . If no IP address set, get the address, either by turning the name into
3946 an address, calling gethostbyname if gethostbyname is on, or by calling
3947 the DNS. The DNS may yield multiple addresses, in which case insert the
3948 extra ones into the list.
3949
3950 . Get the retry data if not previously obtained for this address and set the
3951 field which remembers the state of this address. Skip if the retry time is
3952 not reached. If not, remember whether retry data was found. The retry string
3953 contains both the name and the IP address.
3954
3955 . Scan the list of addresses and mark those whose status is DEFER as
3956 PENDING_DEFER. These are the only ones that will be processed in this cycle
3957 of the hosts loop.
3958
3959 . Make a delivery attempt - addresses marked PENDING_DEFER will be tried.
3960 Some addresses may be successfully delivered, others may fail, and yet
3961 others may get temporary errors and so get marked DEFER.
3962
3963 . The return from the delivery attempt is OK if a connection was made and a
3964 valid SMTP dialogue was completed. Otherwise it is DEFER.
3965
3966 . If OK, add a "remove" retry item for this host/IPaddress, if any.
3967
3968 . If fail to connect, or other defer state, add a retry item.
3969
3970 . If there are any addresses whose status is still DEFER, carry on to the
3971 next host/IPaddress, unless we have tried the number of hosts given
3972 by hosts_max_try or hosts_max_try_hardlimit; otherwise return. Note that
3973 there is some fancy logic for hosts_max_try that means its limit can be
3974 overstepped in some circumstances.
3975
3976 If we get to the end of the list, all hosts have deferred at least one address,
3977 or not reached their retry times. If delay_after_cutoff is unset, it requests a
3978 delivery attempt to those hosts whose last try was before the arrival time of
3979 the current message. To cope with this, we have to go round the loop a second
3980 time. After that, set the status and error data for any addresses that haven't
3981 had it set already. */
3982
3983 for (cutoff_retry = 0;
3984 expired && cutoff_retry < (ob->delay_after_cutoff ? 1 : 2);
3985 cutoff_retry++)
3986 {
3987 host_item *nexthost = NULL;
3988 int unexpired_hosts_tried = 0;
3989 BOOL continue_host_tried = FALSE;
3990
3991 retry_non_continued:
3992 for (host = hostlist;
3993 host
3994 && unexpired_hosts_tried < ob->hosts_max_try
3995 && total_hosts_tried < ob->hosts_max_try_hardlimit;
3996 host = nexthost)
3997 {
3998 int rc;
3999 int host_af;
4000 uschar *rs;
4001 BOOL host_is_expired = FALSE;
4002 BOOL message_defer = FALSE;
4003 BOOL some_deferred = FALSE;
4004 address_item *first_addr = NULL;
4005 uschar *interface = NULL;
4006 uschar *retry_host_key = NULL;
4007 uschar *retry_message_key = NULL;
4008 uschar *serialize_key = NULL;
4009
4010 /* Default next host is next host. :-) But this can vary if the
4011 hosts_max_try limit is hit (see below). It may also be reset if a host
4012 address is looked up here (in case the host was multihomed). */
4013
4014 nexthost = host->next;
4015
4016 /* If the address hasn't yet been obtained from the host name, look it up
4017 now, unless the host is already marked as unusable. If it is marked as
4018 unusable, it means that the router was unable to find its IP address (in
4019 the DNS or wherever) OR we are in the 2nd time round the cutoff loop, and
4020 the lookup failed last time. We don't get this far if *all* MX records
4021 point to non-existent hosts; that is treated as a hard error.
4022
4023 We can just skip this host entirely. When the hosts came from the router,
4024 the address will timeout based on the other host(s); when the address is
4025 looked up below, there is an explicit retry record added.
4026
4027 Note that we mustn't skip unusable hosts if the address is not unset; they
4028 may be needed as expired hosts on the 2nd time round the cutoff loop. */
4029
4030 if (!host->address)
4031 {
4032 int new_port, flags;
4033 host_item *hh;
4034
4035 if (host->status >= hstatus_unusable)
4036 {
4037 DEBUG(D_transport) debug_printf("%s has no address and is unusable - skipping\n",
4038 host->name);
4039 continue;
4040 }
4041
4042 DEBUG(D_transport) debug_printf("getting address for %s\n", host->name);
4043
4044 /* The host name is permitted to have an attached port. Find it, and
4045 strip it from the name. Just remember it for now. */
4046
4047 new_port = host_item_get_port(host);
4048
4049 /* Count hosts looked up */
4050
4051 hosts_looked_up++;
4052
4053 /* Find by name if so configured, or if it's an IP address. We don't
4054 just copy the IP address, because we need the test-for-local to happen. */
4055
4056 flags = HOST_FIND_BY_A | HOST_FIND_BY_AAAA;
4057 if (ob->dns_qualify_single) flags |= HOST_FIND_QUALIFY_SINGLE;
4058 if (ob->dns_search_parents) flags |= HOST_FIND_SEARCH_PARENTS;
4059
4060 if (ob->gethostbyname || string_is_ip_address(host->name, NULL) != 0)
4061 rc = host_find_byname(host, NULL, flags, NULL, TRUE);
4062 else
4063 rc = host_find_bydns(host, NULL, flags, NULL, NULL, NULL,
4064 &ob->dnssec, /* domains for request/require */
4065 NULL, NULL);
4066
4067 /* Update the host (and any additional blocks, resulting from
4068 multihoming) with a host-specific port, if any. */
4069
4070 for (hh = host; hh != nexthost; hh = hh->next) hh->port = new_port;
4071
4072 /* Failure to find the host at this time (usually DNS temporary failure)
4073 is really a kind of routing failure rather than a transport failure.
4074 Therefore we add a retry item of the routing kind, not to stop us trying
4075 to look this name up here again, but to ensure the address gets timed
4076 out if the failures go on long enough. A complete failure at this point
4077 commonly points to a configuration error, but the best action is still
4078 to carry on for the next host. */
4079
4080 if (rc == HOST_FIND_AGAIN || rc == HOST_FIND_SECURITY || rc == HOST_FIND_FAILED)
4081 {
4082 retry_add_item(addrlist, string_sprintf("R:%s", host->name), 0);
4083 expired = FALSE;
4084 if (rc == HOST_FIND_AGAIN) hosts_defer++; else hosts_fail++;
4085 DEBUG(D_transport) debug_printf("rc = %s for %s\n", (rc == HOST_FIND_AGAIN)?
4086 "HOST_FIND_AGAIN" : "HOST_FIND_FAILED", host->name);
4087 host->status = hstatus_unusable;
4088
4089 for (addr = addrlist; addr; addr = addr->next)
4090 {
4091 if (addr->transport_return != DEFER) continue;
4092 addr->basic_errno = ERRNO_UNKNOWNHOST;
4093 addr->message = string_sprintf(
4094 rc == HOST_FIND_SECURITY
4095 ? "lookup of IP address for %s was insecure"
4096 : "failed to lookup IP address for %s",
4097 host->name);
4098 }
4099 continue;
4100 }
4101
4102 /* If the host is actually the local host, we may have a problem, or
4103 there may be some cunning configuration going on. In the problem case,
4104 log things and give up. The default transport status is already DEFER. */
4105
4106 if (rc == HOST_FOUND_LOCAL && !ob->allow_localhost)
4107 {
4108 for (addr = addrlist; addr; addr = addr->next)
4109 {
4110 addr->basic_errno = 0;
4111 addr->message = string_sprintf("%s transport found host %s to be "
4112 "local", tblock->name, host->name);
4113 }
4114 goto END_TRANSPORT;
4115 }
4116 } /* End of block for IP address lookup */
4117
4118 /* If this is a continued delivery, we are interested only in the host
4119 which matches the name of the existing open channel. The check is put
4120 here after the local host lookup, in case the name gets expanded as a
4121 result of the lookup. Set expired FALSE, to save the outer loop executing
4122 twice. */
4123
4124 if (continue_hostname)
4125 if ( Ustrcmp(continue_hostname, host->name) != 0
4126 || Ustrcmp(continue_host_address, host->address) != 0
4127 )
4128 {
4129 expired = FALSE;
4130 continue; /* With next host */
4131 }
4132 else
4133 continue_host_tried = TRUE;
4134
4135 /* Reset the default next host in case a multihomed host whose addresses
4136 are not looked up till just above added to the host list. */
4137
4138 nexthost = host->next;
4139
4140 /* If queue_smtp is set (-odqs or the first part of a 2-stage run), or the
4141 domain is in queue_smtp_domains, we don't actually want to attempt any
4142 deliveries. When doing a queue run, queue_smtp_domains is always unset. If
4143 there is a lookup defer in queue_smtp_domains, proceed as if the domain
4144 were not in it. We don't want to hold up all SMTP deliveries! Except when
4145 doing a two-stage queue run, don't do this if forcing. */
4146
4147 if ((!deliver_force || queue_2stage) && (queue_smtp ||
4148 match_isinlist(addrlist->domain,
4149 (const uschar **)&queue_smtp_domains, 0,
4150 &domainlist_anchor, NULL, MCL_DOMAIN, TRUE, NULL) == OK))
4151 {
4152 expired = FALSE;
4153 for (addr = addrlist; addr; addr = addr->next)
4154 if (addr->transport_return == DEFER)
4155 addr->message = US"domain matches queue_smtp_domains, or -odqs set";
4156 continue; /* With next host */
4157 }
4158
4159 /* Count hosts being considered - purely for an intelligent comment
4160 if none are usable. */
4161
4162 hosts_total++;
4163
4164 /* Set $host and $host address now in case they are needed for the
4165 interface expansion or the serialize_hosts check; they remain set if an
4166 actual delivery happens. */
4167
4168 deliver_host = host->name;
4169 deliver_host_address = host->address;
4170 lookup_dnssec_authenticated = host->dnssec == DS_YES ? US"yes"
4171 : host->dnssec == DS_NO ? US"no"
4172 : US"";
4173
4174 /* Set up a string for adding to the retry key if the port number is not
4175 the standard SMTP port. A host may have its own port setting that overrides
4176 the default. */
4177
4178 pistring = string_sprintf(":%d", host->port == PORT_NONE
4179 ? defport : host->port);
4180 if (Ustrcmp(pistring, ":25") == 0) pistring = US"";
4181
4182 /* Select IPv4 or IPv6, and choose an outgoing interface. If the interface
4183 string is set, even if constant (as different transports can have different
4184 constant settings), we must add it to the key that is used for retries,
4185 because connections to the same host from a different interface should be
4186 treated separately. */
4187
4188 host_af = Ustrchr(host->address, ':') == NULL ? AF_INET : AF_INET6;
4189 if ((rs = ob->interface) && *rs)
4190 {
4191 if (!smtp_get_interface(rs, host_af, addrlist, &interface, tid))
4192 return FALSE;
4193 pistring = string_sprintf("%s/%s", pistring, interface);
4194 }
4195
4196 /* The first time round the outer loop, check the status of the host by
4197 inspecting the retry data. The second time round, we are interested only
4198 in expired hosts that haven't been tried since this message arrived. */
4199
4200 if (cutoff_retry == 0)
4201 {
4202 BOOL incl_ip;
4203 /* Ensure the status of the address is set by checking retry data if
4204 necessary. There may be host-specific retry data (applicable to all
4205 messages) and also data for retries of a specific message at this host.
4206 If either of these retry records are actually read, the keys used are
4207 returned to save recomputing them later. */
4208
4209 if (exp_bool(addrlist, US"transport", tblock->name, D_transport,
4210 US"retry_include_ip_address", ob->retry_include_ip_address,
4211 ob->expand_retry_include_ip_address, &incl_ip) != OK)
4212 continue; /* with next host */
4213
4214 host_is_expired = retry_check_address(addrlist->domain, host, pistring,
4215 incl_ip, &retry_host_key, &retry_message_key);
4216
4217 DEBUG(D_transport) debug_printf("%s [%s]%s retry-status = %s\n", host->name,
4218 (host->address == NULL)? US"" : host->address, pistring,
4219 (host->status == hstatus_usable)? "usable" :
4220 (host->status == hstatus_unusable)? "unusable" :
4221 (host->status == hstatus_unusable_expired)? "unusable (expired)" : "?");
4222
4223 /* Skip this address if not usable at this time, noting if it wasn't
4224 actually expired, both locally and in the address. */
4225
4226 switch (host->status)
4227 {
4228 case hstatus_unusable:
4229 expired = FALSE;
4230 setflag(addrlist, af_retry_skipped);
4231 /* Fall through */
4232
4233 case hstatus_unusable_expired:
4234 switch (host->why)
4235 {
4236 case hwhy_retry: hosts_retry++; break;
4237 case hwhy_failed: hosts_fail++; break;
4238 case hwhy_insecure:
4239 case hwhy_deferred: hosts_defer++; break;
4240 }
4241
4242 /* If there was a retry message key, implying that previously there
4243 was a message-specific defer, we don't want to update the list of
4244 messages waiting for these hosts. */
4245
4246 if (retry_message_key) update_waiting = FALSE;
4247 continue; /* With the next host or IP address */
4248 }
4249 }
4250
4251 /* Second time round the loop: if the address is set but expired, and
4252 the message is newer than the last try, let it through. */
4253
4254 else
4255 {
4256 if ( !host->address
4257 || host->status != hstatus_unusable_expired
4258 || host->last_try > received_time.tv_sec)
4259 continue;
4260 DEBUG(D_transport) debug_printf("trying expired host %s [%s]%s\n",
4261 host->name, host->address, pistring);
4262 host_is_expired = TRUE;
4263 }
4264
4265 /* Setting "expired=FALSE" doesn't actually mean not all hosts are expired;
4266 it remains TRUE only if all hosts are expired and none are actually tried.
4267 */
4268
4269 expired = FALSE;
4270
4271 /* If this host is listed as one to which access must be serialized,
4272 see if another Exim process has a connection to it, and if so, skip
4273 this host. If not, update the database to record our connection to it
4274 and remember this for later deletion. Do not do any of this if we are
4275 sending the message down a pre-existing connection. */
4276
4277 if ( !continue_hostname
4278 && verify_check_given_host(&ob->serialize_hosts, host) == OK)
4279 {
4280 serialize_key = string_sprintf("host-serialize-%s", host->name);
4281 if (!enq_start(serialize_key, 1))
4282 {
4283 DEBUG(D_transport)
4284 debug_printf("skipping host %s because another Exim process "
4285 "is connected to it\n", host->name);
4286 hosts_serial++;
4287 continue;
4288 }
4289 }
4290
4291 /* OK, we have an IP address that is not waiting for its retry time to
4292 arrive (it might be expired) OR (second time round the loop) we have an
4293 expired host that hasn't been tried since the message arrived. Have a go
4294 at delivering the message to it. First prepare the addresses by flushing
4295 out the result of previous attempts, and finding the first address that
4296 is still to be delivered. */
4297
4298 first_addr = prepare_addresses(addrlist, host);
4299
4300 DEBUG(D_transport) debug_printf("delivering %s to %s [%s] (%s%s)\n",
4301 message_id, host->name, host->address, addrlist->address,
4302 addrlist->next ? ", ..." : "");
4303
4304 set_process_info("delivering %s to %s [%s] (%s%s)",
4305 message_id, host->name, host->address, addrlist->address,
4306 addrlist->next ? ", ..." : "");
4307
4308 /* This is not for real; don't do the delivery. If there are
4309 any remaining hosts, list them. */
4310
4311 if (dont_deliver)
4312 {
4313 host_item *host2;
4314 set_errno_nohost(addrlist, 0, NULL, OK, FALSE);
4315 for (addr = addrlist; addr; addr = addr->next)
4316 {
4317 addr->host_used = host;
4318 addr->special_action = '*';
4319 addr->message = US"delivery bypassed by -N option";
4320 }
4321 DEBUG(D_transport)
4322 {
4323 debug_printf("*** delivery by %s transport bypassed by -N option\n"
4324 "*** host and remaining hosts:\n", tblock->name);
4325 for (host2 = host; host2; host2 = host2->next)
4326 debug_printf(" %s [%s]\n", host2->name,
4327 host2->address ? host2->address : US"unset");
4328 }
4329 rc = OK;
4330 }
4331
4332 /* This is for real. If the host is expired, we don't count it for
4333 hosts_max_retry. This ensures that all hosts must expire before an address
4334 is timed out, unless hosts_max_try_hardlimit (which protects against
4335 lunatic DNS configurations) is reached.
4336
4337 If the host is not expired and we are about to hit the hosts_max_retry
4338 limit, check to see if there is a subsequent hosts with a different MX
4339 value. If so, make that the next host, and don't count this one. This is a
4340 heuristic to make sure that different MXs do get tried. With a normal kind
4341 of retry rule, they would get tried anyway when the earlier hosts were
4342 delayed, but if the domain has a "retry every time" type of rule - as is
4343 often used for the the very large ISPs, that won't happen. */
4344
4345 else
4346 {
4347 host_item * thost;
4348 /* Make a copy of the host if it is local to this invocation
4349 of the transport. */
4350
4351 if (expanded_hosts)
4352 {
4353 thost = store_get(sizeof(host_item));
4354 *thost = *host;
4355 thost->name = string_copy(host->name);
4356 thost->address = string_copy(host->address);
4357 }
4358 else
4359 thost = host;
4360
4361 if (!host_is_expired && ++unexpired_hosts_tried >= ob->hosts_max_try)
4362 {
4363 host_item *h;
4364 DEBUG(D_transport)
4365 debug_printf("hosts_max_try limit reached with this host\n");
4366 for (h = host; h; h = h->next) if (h->mx != host->mx)
4367 {
4368 nexthost = h;
4369 unexpired_hosts_tried--;
4370 DEBUG(D_transport) debug_printf("however, a higher MX host exists "
4371 "and will be tried\n");
4372 break;
4373 }
4374 }
4375
4376 /* Attempt the delivery. */
4377
4378 total_hosts_tried++;
4379 rc = smtp_deliver(addrlist, thost, host_af, defport, interface, tblock,
4380 &message_defer, FALSE);
4381
4382 /* Yield is one of:
4383 OK => connection made, each address contains its result;
4384 message_defer is set for message-specific defers (when all
4385 recipients are marked defer)
4386 DEFER => there was a non-message-specific delivery problem;
4387 ERROR => there was a problem setting up the arguments for a filter,
4388 or there was a problem with expanding added headers
4389 */
4390
4391 /* If the result is not OK, there was a non-message-specific problem.
4392 If the result is DEFER, we need to write to the logs saying what happened
4393 for this particular host, except in the case of authentication and TLS
4394 failures, where the log has already been written. If all hosts defer a
4395 general message is written at the end. */
4396
4397 if (rc == DEFER && first_addr->basic_errno != ERRNO_AUTHFAIL
4398 && first_addr->basic_errno != ERRNO_TLSFAILURE)
4399 write_logs(host, first_addr->message, first_addr->basic_errno);
4400
4401 #ifndef DISABLE_EVENT
4402 if (rc == DEFER)
4403 deferred_event_raise(first_addr, host);
4404 #endif
4405
4406 /* If STARTTLS was accepted, but there was a failure in setting up the
4407 TLS session (usually a certificate screwup), and the host is not in
4408 hosts_require_tls, and tls_tempfail_tryclear is true, try again, with
4409 TLS forcibly turned off. We have to start from scratch with a new SMTP
4410 connection. That's why the retry is done from here, not from within
4411 smtp_deliver(). [Rejections of STARTTLS itself don't screw up the
4412 session, so the in-clear transmission after those errors, if permitted,
4413 happens inside smtp_deliver().] */
4414
4415 #ifdef SUPPORT_TLS
4416 if ( rc == DEFER
4417 && first_addr->basic_errno == ERRNO_TLSFAILURE
4418 && ob->tls_tempfail_tryclear
4419 && verify_check_given_host(&ob->hosts_require_tls, host) != OK
4420 )
4421 {
4422 log_write(0, LOG_MAIN,
4423 "%s: delivering unencrypted to H=%s [%s] (not in hosts_require_tls)",
4424 first_addr->message, host->name, host->address);
4425 first_addr = prepare_addresses(addrlist, host);
4426 rc = smtp_deliver(addrlist, thost, host_af, defport, interface, tblock,
4427 &message_defer, TRUE);
4428 if (rc == DEFER && first_addr->basic_errno != ERRNO_AUTHFAIL)
4429 write_logs(host, first_addr->message, first_addr->basic_errno);
4430 # ifndef DISABLE_EVENT
4431 if (rc == DEFER)
4432 deferred_event_raise(first_addr, host);
4433 # endif
4434 }
4435 #endif /*SUPPORT_TLS*/
4436 }
4437
4438 /* Delivery attempt finished */
4439
4440 rs = rc == OK ? US"OK"
4441 : rc == DEFER ? US"DEFER"
4442 : rc == ERROR ? US"ERROR"
4443 : US"?";
4444
4445 set_process_info("delivering %s: just tried %s [%s] for %s%s: result %s",
4446 message_id, host->name, host->address, addrlist->address,
4447 addrlist->next ? " (& others)" : "", rs);
4448
4449 /* Release serialization if set up */
4450
4451 if (serialize_key) enq_end(serialize_key);
4452
4453 /* If the result is DEFER, or if a host retry record is known to exist, we
4454 need to add an item to the retry chain for updating the retry database
4455 at the end of delivery. We only need to add the item to the top address,
4456 of course. Also, if DEFER, we mark the IP address unusable so as to skip it
4457 for any other delivery attempts using the same address. (It is copied into
4458 the unusable tree at the outer level, so even if different address blocks
4459 contain the same address, it still won't get tried again.) */
4460
4461 if (rc == DEFER || retry_host_key)
4462 {
4463 int delete_flag = rc != DEFER ? rf_delete : 0;
4464 if (!retry_host_key)
4465 {
4466 BOOL incl_ip;
4467 if (exp_bool(addrlist, US"transport", tblock->name, D_transport,
4468 US"retry_include_ip_address", ob->retry_include_ip_address,
4469 ob->expand_retry_include_ip_address, &incl_ip) != OK)
4470 incl_ip = TRUE; /* error; use most-specific retry record */
4471
4472 retry_host_key = incl_ip
4473 ? string_sprintf("T:%S:%s%s", host->name, host->address, pistring)
4474 : string_sprintf("T:%S%s", host->name, pistring);
4475 }
4476
4477 /* If a delivery of another message over an existing SMTP connection
4478 yields DEFER, we do NOT set up retry data for the host. This covers the
4479 case when there are delays in routing the addresses in the second message
4480 that are so long that the server times out. This is alleviated by not
4481 routing addresses that previously had routing defers when handling an
4482 existing connection, but even so, this case may occur (e.g. if a
4483 previously happily routed address starts giving routing defers). If the
4484 host is genuinely down, another non-continued message delivery will
4485 notice it soon enough. */
4486
4487 if (delete_flag != 0 || !continue_hostname)
4488 retry_add_item(first_addr, retry_host_key, rf_host | delete_flag);
4489
4490 /* We may have tried an expired host, if its retry time has come; ensure
4491 the status reflects the expiry for the benefit of any other addresses. */
4492
4493 if (rc == DEFER)
4494 {
4495 host->status = host_is_expired
4496 ? hstatus_unusable_expired : hstatus_unusable;
4497 host->why = hwhy_deferred;
4498 }
4499 }
4500
4501 /* If message_defer is set (host was OK, but every recipient got deferred
4502 because of some message-specific problem), or if that had happened
4503 previously so that a message retry key exists, add an appropriate item
4504 to the retry chain. Note that if there was a message defer but now there is
4505 a host defer, the message defer record gets deleted. That seems perfectly
4506 reasonable. Also, stop the message from being remembered as waiting
4507 for specific hosts. */
4508
4509 if (message_defer || retry_message_key)
4510 {
4511 int delete_flag = message_defer ? 0 : rf_delete;
4512 if (!retry_message_key)
4513 {
4514 BOOL incl_ip;
4515 if (exp_bool(addrlist, US"transport", tblock->name, D_transport,
4516 US"retry_include_ip_address", ob->retry_include_ip_address,
4517 ob->expand_retry_include_ip_address, &incl_ip) != OK)
4518 incl_ip = TRUE; /* error; use most-specific retry record */
4519
4520 retry_message_key = incl_ip
4521 ? string_sprintf("T:%S:%s%s:%s", host->name, host->address, pistring,
4522 message_id)
4523 : string_sprintf("T:%S%s:%s", host->name, pistring, message_id);
4524 }
4525 retry_add_item(addrlist, retry_message_key,
4526 rf_message | rf_host | delete_flag);
4527 update_waiting = FALSE;
4528 }
4529
4530 /* Any return other than DEFER (that is, OK or ERROR) means that the
4531 addresses have got their final statuses filled in for this host. In the OK
4532 case, see if any of them are deferred. */
4533
4534 if (rc == OK)
4535 for (addr = addrlist; addr; addr = addr->next)
4536 if (addr->transport_return == DEFER)
4537 {
4538 some_deferred = TRUE;
4539 break;
4540 }
4541
4542 /* If no addresses deferred or the result was ERROR, return. We do this for
4543 ERROR because a failing filter set-up or add_headers expansion is likely to
4544 fail for any host we try. */
4545
4546 if (rc == ERROR || (rc == OK && !some_deferred))
4547 {
4548 DEBUG(D_transport) debug_printf("Leaving %s transport\n", tblock->name);
4549 return TRUE; /* Each address has its status */
4550 }
4551
4552 /* If the result was DEFER or some individual addresses deferred, let
4553 the loop run to try other hosts with the deferred addresses, except for the
4554 case when we were trying to deliver down an existing channel and failed.
4555 Don't try any other hosts in this case. */
4556
4557 if (continue_hostname) break;
4558
4559 /* If the whole delivery, or some individual addresses, were deferred and
4560 there are more hosts that could be tried, do not count this host towards
4561 the hosts_max_try limit if the age of the message is greater than the
4562 maximum retry time for this host. This means we may try try all hosts,
4563 ignoring the limit, when messages have been around for some time. This is
4564 important because if we don't try all hosts, the address will never time
4565 out. NOTE: this does not apply to hosts_max_try_hardlimit. */
4566
4567 if ((rc == DEFER || some_deferred) && nexthost)
4568 {
4569 BOOL timedout;
4570 retry_config *retry = retry_find_config(host->name, NULL, 0, 0);
4571
4572 if (retry && retry->rules)
4573 {
4574 retry_rule *last_rule;
4575 for (last_rule = retry->rules;
4576 last_rule->next;
4577 last_rule = last_rule->next);
4578 timedout = time(NULL) - received_time.tv_sec > last_rule->timeout;
4579 }
4580 else timedout = TRUE; /* No rule => timed out */
4581
4582 if (timedout)
4583 {
4584 unexpired_hosts_tried--;
4585 DEBUG(D_transport) debug_printf("temporary delivery error(s) override "
4586 "hosts_max_try (message older than host's retry time)\n");
4587 }
4588 }
4589 } /* End of loop for trying multiple hosts. */
4590
4591 /* If we failed to find a matching host in the list, for an already-open
4592 connection, just close it and start over with the list. This can happen
4593 for routing that changes from run to run, or big multi-IP sites with
4594 round-robin DNS. */
4595
4596 if (continue_hostname && !continue_host_tried)
4597 {
4598 int fd = cutthrough.fd >= 0 ? cutthrough.fd : 0;
4599
4600 DEBUG(D_transport) debug_printf("no hosts match already-open connection\n");
4601 #ifdef SUPPORT_TLS
4602 if (tls_out.active == fd)
4603 {
4604 (void) tls_write(FALSE, US"QUIT\r\n", 6, FALSE);
4605 tls_close(FALSE, TLS_SHUTDOWN_NOWAIT);
4606 }
4607 else
4608 #else
4609 (void) write(fd, US"QUIT\r\n", 6);
4610 #endif
4611 (void) close(fd);
4612 cutthrough.fd = -1;
4613 continue_hostname = NULL;
4614 goto retry_non_continued;
4615 }
4616
4617 /* This is the end of the loop that repeats iff expired is TRUE and
4618 ob->delay_after_cutoff is FALSE. The second time round we will
4619 try those hosts that haven't been tried since the message arrived. */
4620
4621 DEBUG(D_transport)
4622 {
4623 debug_printf("all IP addresses skipped or deferred at least one address\n");
4624 if (expired && !ob->delay_after_cutoff && cutoff_retry == 0)
4625 debug_printf("retrying IP addresses not tried since message arrived\n");
4626 }
4627 }
4628
4629
4630 /* Get here if all IP addresses are skipped or defer at least one address. In
4631 MUA wrapper mode, this will happen only for connection or other non-message-
4632 specific failures. Force the delivery status for all addresses to FAIL. */
4633
4634 if (mua_wrapper)
4635 {
4636 for (addr = addrlist; addr; addr = addr->next)
4637 addr->transport_return = FAIL;
4638 goto END_TRANSPORT;
4639 }
4640
4641 /* In the normal, non-wrapper case, add a standard message to each deferred
4642 address if there hasn't been an error, that is, if it hasn't actually been
4643 tried this time. The variable "expired" will be FALSE if any deliveries were
4644 actually tried, or if there was at least one host that was not expired. That
4645 is, it is TRUE only if no deliveries were tried and all hosts were expired. If
4646 a delivery has been tried, an error code will be set, and the failing of the
4647 message is handled by the retry code later.
4648
4649 If queue_smtp is set, or this transport was called to send a subsequent message
4650 down an existing TCP/IP connection, and something caused the host not to be
4651 found, we end up here, but can detect these cases and handle them specially. */
4652
4653 for (addr = addrlist; addr; addr = addr->next)
4654 {
4655 /* If host is not NULL, it means that we stopped processing the host list
4656 because of hosts_max_try or hosts_max_try_hardlimit. In the former case, this
4657 means we need to behave as if some hosts were skipped because their retry
4658 time had not come. Specifically, this prevents the address from timing out.
4659 However, if we have hit hosts_max_try_hardlimit, we want to behave as if all
4660 hosts were tried. */
4661
4662 if (host)
4663 if (total_hosts_tried >= ob->hosts_max_try_hardlimit)
4664 {
4665 DEBUG(D_transport)
4666 debug_printf("hosts_max_try_hardlimit reached: behave as if all "
4667 "hosts were tried\n");
4668 }
4669 else
4670 {
4671 DEBUG(D_transport)
4672 debug_printf("hosts_max_try limit caused some hosts to be skipped\n");
4673 setflag(addr, af_retry_skipped);
4674 }
4675
4676 if (queue_smtp) /* no deliveries attempted */
4677 {
4678 addr->transport_return = DEFER;
4679 addr->basic_errno = 0;
4680 addr->message = US"SMTP delivery explicitly queued";
4681 }
4682
4683 else if ( addr->transport_return == DEFER
4684 && (addr->basic_errno == ERRNO_UNKNOWNERROR || addr->basic_errno == 0)
4685 && !addr->message
4686 )
4687 {
4688 addr->basic_errno = ERRNO_HRETRY;
4689 if (continue_hostname)
4690 addr->message = US"no host found for existing SMTP connection";
4691 else if (expired)
4692 {
4693 setflag(addr, af_pass_message); /* This is not a security risk */
4694 addr->message = string_sprintf(
4695 "all hosts%s have been failing for a long time %s",
4696 addr->domain ? string_sprintf(" for '%s'", addr->domain) : US"",
4697 ob->delay_after_cutoff
4698 ? US"(and retry time not reached)"
4699 : US"and were last tried after this message arrived");
4700
4701 /* If we are already using fallback hosts, or there are no fallback hosts
4702 defined, convert the result to FAIL to cause a bounce. */
4703
4704 if (addr->host_list == addr->fallback_hosts || !addr->fallback_hosts)
4705 addr->transport_return = FAIL;
4706 }
4707 else
4708 {
4709 const char * s;
4710 if (hosts_retry == hosts_total)
4711 s = "retry time not reached for any host%s";
4712 else if (hosts_fail == hosts_total)
4713 s = "all host address lookups%s failed permanently";
4714 else if (hosts_defer == hosts_total)
4715 s = "all host address lookups%s failed temporarily";
4716 else if (hosts_serial == hosts_total)
4717 s = "connection limit reached for all hosts%s";
4718 else if (hosts_fail+hosts_defer == hosts_total)
4719 s = "all host address lookups%s failed";
4720 else
4721 s = "some host address lookups failed and retry time "
4722 "not reached for other hosts or connection limit reached%s";
4723
4724 addr->message = string_sprintf(s,
4725 addr->domain ? string_sprintf(" for '%s'", addr->domain) : US"");
4726 }
4727 }
4728 }
4729
4730 /* Update the database which keeps information about which messages are waiting
4731 for which hosts to become available. For some message-specific errors, the
4732 update_waiting flag is turned off because we don't want follow-on deliveries in
4733 those cases. If this transport instance is explicitly limited to one message
4734 per connection then follow-on deliveries are not possible and there's no need
4735 to create/update the per-transport wait-<transport_name> database. */
4736
4737 if (update_waiting && tblock->connection_max_messages != 1)
4738 transport_update_waiting(hostlist, tblock->name);
4739
4740 END_TRANSPORT:
4741
4742 DEBUG(D_transport) debug_printf("Leaving %s transport\n", tblock->name);
4743
4744 return TRUE; /* Each address has its status */
4745 }
4746
4747 #endif /*!MACRO_PREDEF*/
4748 /* vi: aw ai sw=2
4749 */
4750 /* End of transport/smtp.c */
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