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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 { "data_timeout", opt_time,
42 (void *)offsetof(smtp_transport_options_block, data_timeout) },
43 { "delay_after_cutoff", opt_bool,
44 (void *)offsetof(smtp_transport_options_block, delay_after_cutoff) },
45 #ifndef DISABLE_DKIM
46 { "dkim_canon", opt_stringptr,
47 (void *)offsetof(smtp_transport_options_block, dkim.dkim_canon) },
48 { "dkim_domain", opt_stringptr,
49 (void *)offsetof(smtp_transport_options_block, dkim.dkim_domain) },
50 { "dkim_hash", opt_stringptr,
51 (void *)offsetof(smtp_transport_options_block, dkim.dkim_hash) },
52 { "dkim_identity", opt_stringptr,
53 (void *)offsetof(smtp_transport_options_block, dkim.dkim_identity) },
54 { "dkim_private_key", opt_stringptr,
55 (void *)offsetof(smtp_transport_options_block, dkim.dkim_private_key) },
56 { "dkim_selector", opt_stringptr,
57 (void *)offsetof(smtp_transport_options_block, dkim.dkim_selector) },
58 { "dkim_sign_headers", opt_stringptr,
59 (void *)offsetof(smtp_transport_options_block, dkim.dkim_sign_headers) },
60 { "dkim_strict", opt_stringptr,
61 (void *)offsetof(smtp_transport_options_block, dkim.dkim_strict) },
62 #endif
63 { "dns_qualify_single", opt_bool,
64 (void *)offsetof(smtp_transport_options_block, dns_qualify_single) },
65 { "dns_search_parents", opt_bool,
66 (void *)offsetof(smtp_transport_options_block, dns_search_parents) },
67 { "dnssec_request_domains", opt_stringptr,
68 (void *)offsetof(smtp_transport_options_block, dnssec.request) },
69 { "dnssec_require_domains", opt_stringptr,
70 (void *)offsetof(smtp_transport_options_block, dnssec.require) },
71 { "dscp", opt_stringptr,
72 (void *)offsetof(smtp_transport_options_block, dscp) },
73 { "fallback_hosts", opt_stringptr,
74 (void *)offsetof(smtp_transport_options_block, fallback_hosts) },
75 { "final_timeout", opt_time,
76 (void *)offsetof(smtp_transport_options_block, final_timeout) },
77 { "gethostbyname", opt_bool,
78 (void *)offsetof(smtp_transport_options_block, gethostbyname) },
79 { "helo_data", opt_stringptr,
80 (void *)offsetof(smtp_transport_options_block, helo_data) },
81 { "hosts", opt_stringptr,
82 (void *)offsetof(smtp_transport_options_block, hosts) },
83 { "hosts_avoid_esmtp", opt_stringptr,
84 (void *)offsetof(smtp_transport_options_block, hosts_avoid_esmtp) },
85 { "hosts_avoid_pipelining", opt_stringptr,
86 (void *)offsetof(smtp_transport_options_block, hosts_avoid_pipelining) },
87 #ifdef SUPPORT_TLS
88 { "hosts_avoid_tls", opt_stringptr,
89 (void *)offsetof(smtp_transport_options_block, hosts_avoid_tls) },
90 #endif
91 { "hosts_max_try", opt_int,
92 (void *)offsetof(smtp_transport_options_block, hosts_max_try) },
93 { "hosts_max_try_hardlimit", opt_int,
94 (void *)offsetof(smtp_transport_options_block, hosts_max_try_hardlimit) },
95 #ifdef SUPPORT_TLS
96 { "hosts_nopass_tls", opt_stringptr,
97 (void *)offsetof(smtp_transport_options_block, hosts_nopass_tls) },
98 { "hosts_noproxy_tls", opt_stringptr,
99 (void *)offsetof(smtp_transport_options_block, hosts_noproxy_tls) },
100 #endif
101 { "hosts_override", opt_bool,
102 (void *)offsetof(smtp_transport_options_block, hosts_override) },
103 { "hosts_randomize", opt_bool,
104 (void *)offsetof(smtp_transport_options_block, hosts_randomize) },
105 #if defined(SUPPORT_TLS) && !defined(DISABLE_OCSP)
106 { "hosts_request_ocsp", opt_stringptr,
107 (void *)offsetof(smtp_transport_options_block, hosts_request_ocsp) },
108 #endif
109 { "hosts_require_auth", opt_stringptr,
110 (void *)offsetof(smtp_transport_options_block, hosts_require_auth) },
111 #ifdef SUPPORT_TLS
112 # ifdef SUPPORT_DANE
113 { "hosts_require_dane", opt_stringptr,
114 (void *)offsetof(smtp_transport_options_block, hosts_require_dane) },
115 # endif
116 # ifndef DISABLE_OCSP
117 { "hosts_require_ocsp", opt_stringptr,
118 (void *)offsetof(smtp_transport_options_block, hosts_require_ocsp) },
119 # endif
120 { "hosts_require_tls", opt_stringptr,
121 (void *)offsetof(smtp_transport_options_block, hosts_require_tls) },
122 #endif
123 { "hosts_try_auth", opt_stringptr,
124 (void *)offsetof(smtp_transport_options_block, hosts_try_auth) },
125 { "hosts_try_chunking", opt_stringptr,
126 (void *)offsetof(smtp_transport_options_block, hosts_try_chunking) },
127 #if defined(SUPPORT_TLS) && defined(SUPPORT_DANE)
128 { "hosts_try_dane", opt_stringptr,
129 (void *)offsetof(smtp_transport_options_block, hosts_try_dane) },
130 #endif
131 { "hosts_try_fastopen", opt_stringptr,
132 (void *)offsetof(smtp_transport_options_block, hosts_try_fastopen) },
133 #ifndef DISABLE_PRDR
134 { "hosts_try_prdr", opt_stringptr,
135 (void *)offsetof(smtp_transport_options_block, hosts_try_prdr) },
136 #endif
137 #ifdef SUPPORT_TLS
138 { "hosts_verify_avoid_tls", opt_stringptr,
139 (void *)offsetof(smtp_transport_options_block, hosts_verify_avoid_tls) },
140 #endif
141 { "interface", opt_stringptr,
142 (void *)offsetof(smtp_transport_options_block, interface) },
143 { "keepalive", opt_bool,
144 (void *)offsetof(smtp_transport_options_block, keepalive) },
145 { "lmtp_ignore_quota", opt_bool,
146 (void *)offsetof(smtp_transport_options_block, lmtp_ignore_quota) },
147 { "max_rcpt", opt_int | opt_public,
148 (void *)offsetof(transport_instance, max_addresses) },
149 { "multi_domain", opt_expand_bool | opt_public,
150 (void *)offsetof(transport_instance, multi_domain) },
151 { "port", opt_stringptr,
152 (void *)offsetof(smtp_transport_options_block, port) },
153 { "protocol", opt_stringptr,
154 (void *)offsetof(smtp_transport_options_block, protocol) },
155 { "retry_include_ip_address", opt_expand_bool,
156 (void *)offsetof(smtp_transport_options_block, retry_include_ip_address) },
157 { "serialize_hosts", opt_stringptr,
158 (void *)offsetof(smtp_transport_options_block, serialize_hosts) },
159 { "size_addition", opt_int,
160 (void *)offsetof(smtp_transport_options_block, size_addition) }
161 #ifdef SUPPORT_SOCKS
162 ,{ "socks_proxy", opt_stringptr,
163 (void *)offsetof(smtp_transport_options_block, socks_proxy) }
164 #endif
165 #ifdef SUPPORT_TLS
166 ,{ "tls_certificate", opt_stringptr,
167 (void *)offsetof(smtp_transport_options_block, tls_certificate) },
168 { "tls_crl", opt_stringptr,
169 (void *)offsetof(smtp_transport_options_block, tls_crl) },
170 { "tls_dh_min_bits", opt_int,
171 (void *)offsetof(smtp_transport_options_block, tls_dh_min_bits) },
172 { "tls_privatekey", opt_stringptr,
173 (void *)offsetof(smtp_transport_options_block, tls_privatekey) },
174 { "tls_require_ciphers", opt_stringptr,
175 (void *)offsetof(smtp_transport_options_block, tls_require_ciphers) },
176 { "tls_sni", opt_stringptr,
177 (void *)offsetof(smtp_transport_options_block, tls_sni) },
178 { "tls_tempfail_tryclear", opt_bool,
179 (void *)offsetof(smtp_transport_options_block, tls_tempfail_tryclear) },
180 { "tls_try_verify_hosts", opt_stringptr,
181 (void *)offsetof(smtp_transport_options_block, tls_try_verify_hosts) },
182 { "tls_verify_cert_hostnames", opt_stringptr,
183 (void *)offsetof(smtp_transport_options_block,tls_verify_cert_hostnames)},
184 { "tls_verify_certificates", opt_stringptr,
185 (void *)offsetof(smtp_transport_options_block, tls_verify_certificates) },
186 { "tls_verify_hosts", opt_stringptr,
187 (void *)offsetof(smtp_transport_options_block, tls_verify_hosts) }
188 #endif
189 };
190
191 /* Size of the options list. An extern variable has to be used so that its
192 address can appear in the tables drtables.c. */
193
194 int smtp_transport_options_count =
195 sizeof(smtp_transport_options)/sizeof(optionlist);
196
197
198 #ifdef MACRO_PREDEF
199
200 /* Dummy values */
201 smtp_transport_options_block smtp_transport_option_defaults = {0};
202 void smtp_transport_init(transport_instance *tblock) {}
203 BOOL smtp_transport_entry(transport_instance *tblock, address_item *addr) {return FALSE;}
204 void smtp_transport_closedown(transport_instance *tblock) {}
205
206 #else /*!MACRO_PREDEF*/
207
208
209 /* Default private options block for the smtp transport. */
210
211 smtp_transport_options_block smtp_transport_option_defaults = {
212 .hosts = NULL,
213 .fallback_hosts = NULL,
214 .hostlist = NULL,
215 .fallback_hostlist = NULL,
216 .helo_data = US"$primary_hostname",
217 .interface = NULL,
218 .port = NULL,
219 .protocol = US"smtp",
220 .dscp = NULL,
221 .serialize_hosts = NULL,
222 .hosts_try_auth = NULL,
223 .hosts_require_auth = NULL,
224 .hosts_try_chunking = US"*",
225 #ifdef SUPPORT_DANE
226 .hosts_try_dane = NULL,
227 .hosts_require_dane = NULL,
228 #endif
229 .hosts_try_fastopen = NULL,
230 #ifndef DISABLE_PRDR
231 .hosts_try_prdr = US"*",
232 #endif
233 #ifndef DISABLE_OCSP
234 .hosts_request_ocsp = US"*", /* hosts_request_ocsp (except under DANE; tls_client_start()) */
235 .hosts_require_ocsp = NULL,
236 #endif
237 .hosts_require_tls = NULL,
238 .hosts_avoid_tls = NULL,
239 .hosts_verify_avoid_tls = NULL,
240 .hosts_avoid_pipelining = NULL,
241 .hosts_avoid_esmtp = NULL,
242 #ifdef SUPPORT_TLS
243 .hosts_nopass_tls = NULL,
244 .hosts_noproxy_tls = US"*",
245 #endif
246 .command_timeout = 5*60,
247 .connect_timeout = 5*60,
248 .data_timeout = 5*60,
249 .final_timeout = 10*60,
250 .size_addition = 1024,
251 .hosts_max_try = 5,
252 .hosts_max_try_hardlimit = 50,
253 .address_retry_include_sender = TRUE,
254 .allow_localhost = FALSE,
255 .authenticated_sender_force = FALSE,
256 .gethostbyname = FALSE,
257 .dns_qualify_single = TRUE,
258 .dns_search_parents = FALSE,
259 .dnssec = { .request=NULL, .require=NULL },
260 .delay_after_cutoff = TRUE,
261 .hosts_override = FALSE,
262 .hosts_randomize = FALSE,
263 .keepalive = TRUE,
264 .lmtp_ignore_quota = FALSE,
265 .expand_retry_include_ip_address = NULL,
266 .retry_include_ip_address = TRUE,
267 #ifdef SUPPORT_SOCKS
268 .socks_proxy = NULL,
269 #endif
270 #ifdef SUPPORT_TLS
271 .tls_certificate = NULL,
272 .tls_crl = NULL,
273 .tls_privatekey = NULL,
274 .tls_require_ciphers = NULL,
275 .tls_sni = NULL,
276 .tls_verify_certificates = US"system",
277 .tls_dh_min_bits = EXIM_CLIENT_DH_DEFAULT_MIN_BITS,
278 .tls_tempfail_tryclear = TRUE,
279 .tls_verify_hosts = NULL,
280 .tls_try_verify_hosts = US"*",
281 .tls_verify_cert_hostnames = US"*",
282 #endif
283 #ifndef DISABLE_DKIM
284 .dkim =
285 {.dkim_domain = NULL,
286 .dkim_identity = NULL,
287 .dkim_private_key = NULL,
288 .dkim_selector = NULL,
289 .dkim_canon = NULL,
290 .dkim_sign_headers = NULL,
291 .dkim_strict = NULL,
292 .dkim_hash = US"sha256",
293 .dot_stuffed = FALSE,
294 .force_bodyhash = FALSE,
295 # ifdef EXPERIMENTAL_ARC
296 .arc_signspec = NULL,
297 # endif
298 },
299 # ifdef EXPERIMENTAL_ARC
300 .arc_sign = NULL,
301 # endif
302 #endif
303 };
304
305 /* some DSN flags for use later */
306
307 static int rf_list[] = {rf_notify_never, rf_notify_success,
308 rf_notify_failure, rf_notify_delay };
309
310 static uschar *rf_names[] = { US"NEVER", US"SUCCESS", US"FAILURE", US"DELAY" };
311
312
313
314 /* Local statics */
315
316 static uschar *smtp_command; /* Points to last cmd for error messages */
317 static uschar *mail_command; /* Points to MAIL cmd for error messages */
318 static uschar *data_command = US""; /* Points to DATA cmd for error messages */
319 static BOOL update_waiting; /* TRUE to update the "wait" database */
320
321 /*XXX move to smtp_context */
322 static BOOL pipelining_active; /* current transaction is in pipe mode */
323
324
325 /*************************************************
326 * Setup entry point *
327 *************************************************/
328
329 /* This function is called when the transport is about to be used,
330 but before running it in a sub-process. It is used for two things:
331
332 (1) To set the fallback host list in addresses, when delivering.
333 (2) To pass back the interface, port, protocol, and other options, for use
334 during callout verification.
335
336 Arguments:
337 tblock pointer to the transport instance block
338 addrlist list of addresses about to be transported
339 tf if not NULL, pointer to block in which to return options
340 uid the uid that will be set (not used)
341 gid the gid that will be set (not used)
342 errmsg place for error message (not used)
343
344 Returns: OK always (FAIL, DEFER not used)
345 */
346
347 static int
348 smtp_transport_setup(transport_instance *tblock, address_item *addrlist,
349 transport_feedback *tf, uid_t uid, gid_t gid, uschar **errmsg)
350 {
351 smtp_transport_options_block *ob =
352 (smtp_transport_options_block *)(tblock->options_block);
353
354 errmsg = errmsg; /* Keep picky compilers happy */
355 uid = uid;
356 gid = gid;
357
358 /* Pass back options if required. This interface is getting very messy. */
359
360 if (tf)
361 {
362 tf->interface = ob->interface;
363 tf->port = ob->port;
364 tf->protocol = ob->protocol;
365 tf->hosts = ob->hosts;
366 tf->hosts_override = ob->hosts_override;
367 tf->hosts_randomize = ob->hosts_randomize;
368 tf->gethostbyname = ob->gethostbyname;
369 tf->qualify_single = ob->dns_qualify_single;
370 tf->search_parents = ob->dns_search_parents;
371 tf->helo_data = ob->helo_data;
372 }
373
374 /* Set the fallback host list for all the addresses that don't have fallback
375 host lists, provided that the local host wasn't present in the original host
376 list. */
377
378 if (!testflag(addrlist, af_local_host_removed))
379 for (; addrlist; addrlist = addrlist->next)
380 if (!addrlist->fallback_hosts) addrlist->fallback_hosts = ob->fallback_hostlist;
381
382 return OK;
383 }
384
385
386
387 /*************************************************
388 * Initialization entry point *
389 *************************************************/
390
391 /* Called for each instance, after its options have been read, to
392 enable consistency checks to be done, or anything else that needs
393 to be set up.
394
395 Argument: pointer to the transport instance block
396 Returns: nothing
397 */
398
399 void
400 smtp_transport_init(transport_instance *tblock)
401 {
402 smtp_transport_options_block *ob =
403 (smtp_transport_options_block *)(tblock->options_block);
404
405 /* Retry_use_local_part defaults FALSE if unset */
406
407 if (tblock->retry_use_local_part == TRUE_UNSET)
408 tblock->retry_use_local_part = FALSE;
409
410 /* Set the default port according to the protocol */
411
412 if (ob->port == NULL)
413 ob->port = (strcmpic(ob->protocol, US"lmtp") == 0)? US"lmtp" :
414 (strcmpic(ob->protocol, US"smtps") == 0)? US"smtps" : US"smtp";
415
416 /* Set up the setup entry point, to be called before subprocesses for this
417 transport. */
418
419 tblock->setup = smtp_transport_setup;
420
421 /* Complain if any of the timeouts are zero. */
422
423 if (ob->command_timeout <= 0 || ob->data_timeout <= 0 ||
424 ob->final_timeout <= 0)
425 log_write(0, LOG_PANIC_DIE|LOG_CONFIG,
426 "command, data, or final timeout value is zero for %s transport",
427 tblock->name);
428
429 /* If hosts_override is set and there are local hosts, set the global
430 flag that stops verify from showing router hosts. */
431
432 if (ob->hosts_override && ob->hosts != NULL) tblock->overrides_hosts = TRUE;
433
434 /* If there are any fallback hosts listed, build a chain of host items
435 for them, but do not do any lookups at this time. */
436
437 host_build_hostlist(&(ob->fallback_hostlist), ob->fallback_hosts, FALSE);
438 }
439
440
441
442
443
444 /*************************************************
445 * Set delivery info into all active addresses *
446 *************************************************/
447
448 /* Only addresses whose status is >= PENDING are relevant. A lesser
449 status means that an address is not currently being processed.
450
451 Arguments:
452 addrlist points to a chain of addresses
453 errno_value to put in each address's errno field
454 msg to put in each address's message field
455 rc to put in each address's transport_return field
456 pass_message if TRUE, set the "pass message" flag in the address
457 host if set, mark addrs as having used this host
458 smtp_greeting from peer
459 helo_response from peer
460
461 If errno_value has the special value ERRNO_CONNECTTIMEOUT, ETIMEDOUT is put in
462 the errno field, and RTEF_CTOUT is ORed into the more_errno field, to indicate
463 this particular type of timeout.
464
465 Returns: nothing
466 */
467
468 static void
469 set_errno(address_item *addrlist, int errno_value, uschar *msg, int rc,
470 BOOL pass_message, host_item * host
471 #ifdef EXPERIMENTAL_DSN_INFO
472 , const uschar * smtp_greeting, const uschar * helo_response
473 #endif
474 )
475 {
476 address_item *addr;
477 int orvalue = 0;
478 if (errno_value == ERRNO_CONNECTTIMEOUT)
479 {
480 errno_value = ETIMEDOUT;
481 orvalue = RTEF_CTOUT;
482 }
483 for (addr = addrlist; addr; addr = addr->next)
484 if (addr->transport_return >= PENDING)
485 {
486 addr->basic_errno = errno_value;
487 addr->more_errno |= orvalue;
488 if (msg)
489 {
490 addr->message = msg;
491 if (pass_message) setflag(addr, af_pass_message);
492 }
493 addr->transport_return = rc;
494 if (host)
495 {
496 addr->host_used = host;
497 #ifdef EXPERIMENTAL_DSN_INFO
498 if (smtp_greeting)
499 {uschar * s = Ustrchr(smtp_greeting, '\n'); if (s) *s = '\0';}
500 addr->smtp_greeting = smtp_greeting;
501
502 if (helo_response)
503 {uschar * s = Ustrchr(helo_response, '\n'); if (s) *s = '\0';}
504 addr->helo_response = helo_response;
505 #endif
506 }
507 }
508 }
509
510 static void
511 set_errno_nohost(address_item *addrlist, int errno_value, uschar *msg, int rc,
512 BOOL pass_message)
513 {
514 set_errno(addrlist, errno_value, msg, rc, pass_message, NULL
515 #ifdef EXPERIMENTAL_DSN_INFO
516 , NULL, NULL
517 #endif
518 );
519 }
520
521
522 /*************************************************
523 * Check an SMTP response *
524 *************************************************/
525
526 /* This function is given an errno code and the SMTP response buffer
527 to analyse, together with the host identification for generating messages. It
528 sets an appropriate message and puts the first digit of the response code into
529 the yield variable. If no response was actually read, a suitable digit is
530 chosen.
531
532 Arguments:
533 host the current host, to get its name for messages
534 errno_value pointer to the errno value
535 more_errno from the top address for use with ERRNO_FILTER_FAIL
536 buffer the SMTP response buffer
537 yield where to put a one-digit SMTP response code
538 message where to put an error message
539 pass_message set TRUE if message is an SMTP response
540
541 Returns: TRUE if an SMTP "QUIT" command should be sent, else FALSE
542 */
543
544 static BOOL
545 check_response(host_item *host, int *errno_value, int more_errno,
546 uschar *buffer, int *yield, uschar **message, BOOL *pass_message)
547 {
548 uschar * pl = pipelining_active ? US"pipelined " : US"";
549 const uschar * s;
550
551 *yield = '4'; /* Default setting is to give a temporary error */
552
553 switch(*errno_value)
554 {
555 case ETIMEDOUT: /* Handle response timeout */
556 *message = US string_sprintf("SMTP timeout after %s%s",
557 pl, smtp_command);
558 if (transport_count > 0)
559 *message = US string_sprintf("%s (%d bytes written)", *message,
560 transport_count);
561 return FALSE;
562
563 case ERRNO_SMTPFORMAT: /* Handle malformed SMTP response */
564 s = string_printing(buffer);
565 while (isspace(*s)) s++;
566 *message = *s == 0
567 ? string_sprintf("Malformed SMTP reply (an empty line) "
568 "in response to %s%s", pl, smtp_command)
569 : string_sprintf("Malformed SMTP reply in response to %s%s: %s",
570 pl, smtp_command, s);
571 return FALSE;
572
573 case ERRNO_FILTER_FAIL: /* Handle a failed filter process error;
574 can't send QUIT as we mustn't end the DATA. */
575 *message = string_sprintf("transport filter process failed (%d)%s",
576 more_errno,
577 more_errno == EX_EXECFAILED ? ": unable to execute command" : "");
578 return FALSE;
579
580 case ERRNO_CHHEADER_FAIL: /* Handle a failed add_headers expansion;
581 can't send QUIT as we mustn't end the DATA. */
582 *message =
583 string_sprintf("failed to expand headers_add or headers_remove: %s",
584 expand_string_message);
585 return FALSE;
586
587 case ERRNO_WRITEINCOMPLETE: /* failure to write a complete data block */
588 *message = string_sprintf("failed to write a data block");
589 return FALSE;
590
591 #ifdef SUPPORT_I18N
592 case ERRNO_UTF8_FWD: /* no advertised SMTPUTF8, for international message */
593 *message = US"utf8 support required but not offered for forwarding";
594 DEBUG(D_deliver|D_transport) debug_printf("%s\n", *message);
595 return TRUE;
596 #endif
597 }
598
599 /* Handle error responses from the remote mailer. */
600
601 if (buffer[0] != 0)
602 {
603 *message = string_sprintf("SMTP error from remote mail server after %s%s: "
604 "%s", pl, smtp_command, s = string_printing(buffer));
605 *pass_message = TRUE;
606 *yield = buffer[0];
607 return TRUE;
608 }
609
610 /* No data was read. If there is no errno, this must be the EOF (i.e.
611 connection closed) case, which causes deferral. An explicit connection reset
612 error has the same effect. Otherwise, put the host's identity in the message,
613 leaving the errno value to be interpreted as well. In all cases, we have to
614 assume the connection is now dead. */
615
616 if (*errno_value == 0 || *errno_value == ECONNRESET)
617 {
618 *errno_value = ERRNO_SMTPCLOSED;
619 *message = US string_sprintf("Remote host closed connection "
620 "in response to %s%s", pl, smtp_command);
621 }
622 else
623 *message = US string_sprintf("%s [%s]", host->name, host->address);
624
625 return FALSE;
626 }
627
628
629
630 /*************************************************
631 * Write error message to logs *
632 *************************************************/
633
634 /* This writes to the main log and to the message log.
635
636 Arguments:
637 host the current host
638 detail the current message (addr_item->message)
639 basic_errno the errno (addr_item->basic_errno)
640
641 Returns: nothing
642 */
643
644 static void
645 write_logs(const host_item *host, const uschar *suffix, int basic_errno)
646 {
647
648
649 uschar *message = LOGGING(outgoing_port)
650 ? string_sprintf("H=%s [%s]:%d", host->name, host->address,
651 host->port == PORT_NONE ? 25 : host->port)
652 : string_sprintf("H=%s [%s]", host->name, host->address);
653
654 if (suffix)
655 {
656 message = string_sprintf("%s: %s", message, suffix);
657 if (basic_errno > 0)
658 message = string_sprintf("%s: %s", message, strerror(basic_errno));
659 }
660 else
661 message = string_sprintf("%s %s", message, exim_errstr(basic_errno));
662
663 log_write(0, LOG_MAIN, "%s", message);
664 deliver_msglog("%s %s\n", tod_stamp(tod_log), message);
665 }
666
667 static void
668 msglog_line(host_item * host, uschar * message)
669 {
670 deliver_msglog("%s H=%s [%s] %s\n", tod_stamp(tod_log),
671 host->name, host->address, message);
672 }
673
674
675
676 #ifndef DISABLE_EVENT
677 /*************************************************
678 * Post-defer action *
679 *************************************************/
680
681 /* This expands an arbitrary per-transport string.
682 It might, for example, be used to write to the database log.
683
684 Arguments:
685 addr the address item containing error information
686 host the current host
687
688 Returns: nothing
689 */
690
691 static void
692 deferred_event_raise(address_item *addr, host_item *host)
693 {
694 uschar * action = addr->transport->event_action;
695 const uschar * save_domain;
696 uschar * save_local;
697
698 if (!action)
699 return;
700
701 save_domain = deliver_domain;
702 save_local = deliver_localpart;
703
704 /*XXX would ip & port already be set up? */
705 deliver_host_address = string_copy(host->address);
706 deliver_host_port = host->port == PORT_NONE ? 25 : host->port;
707 event_defer_errno = addr->basic_errno;
708
709 router_name = addr->router->name;
710 transport_name = addr->transport->name;
711 deliver_domain = addr->domain;
712 deliver_localpart = addr->local_part;
713
714 (void) event_raise(action, US"msg:host:defer",
715 addr->message
716 ? addr->basic_errno > 0
717 ? string_sprintf("%s: %s", addr->message, strerror(addr->basic_errno))
718 : string_copy(addr->message)
719 : addr->basic_errno > 0
720 ? string_copy(US strerror(addr->basic_errno))
721 : NULL);
722
723 deliver_localpart = save_local;
724 deliver_domain = save_domain;
725 router_name = transport_name = NULL;
726 }
727 #endif
728
729 /*************************************************
730 * Synchronize SMTP responses *
731 *************************************************/
732
733 /* This function is called from smtp_deliver() to receive SMTP responses from
734 the server, and match them up with the commands to which they relate. When
735 PIPELINING is not in use, this function is called after every command, and is
736 therefore somewhat over-engineered, but it is simpler to use a single scheme
737 that works both with and without PIPELINING instead of having two separate sets
738 of code.
739
740 The set of commands that are buffered up with pipelining may start with MAIL
741 and may end with DATA; in between are RCPT commands that correspond to the
742 addresses whose status is PENDING_DEFER. All other commands (STARTTLS, AUTH,
743 etc.) are never buffered.
744
745 Errors after MAIL or DATA abort the whole process leaving the response in the
746 buffer. After MAIL, pending responses are flushed, and the original command is
747 re-instated in big_buffer for error messages. For RCPT commands, the remote is
748 permitted to reject some recipient addresses while accepting others. However
749 certain errors clearly abort the whole process. Set the value in
750 transport_return to PENDING_OK if the address is accepted. If there is a
751 subsequent general error, it will get reset accordingly. If not, it will get
752 converted to OK at the end.
753
754 Arguments:
755 sx smtp connection context
756 count the number of responses to read
757 pending_DATA 0 if last command sent was not DATA
758 +1 if previously had a good recipient
759 -1 if not previously had a good recipient
760
761 Returns: 3 if at least one address had 2xx and one had 5xx
762 2 if at least one address had 5xx but none had 2xx
763 1 if at least one host had a 2xx response, but none had 5xx
764 0 no address had 2xx or 5xx but no errors (all 4xx, or just DATA)
765 -1 timeout while reading RCPT response
766 -2 I/O or other non-response error for RCPT
767 -3 DATA or MAIL failed - errno and buffer set
768 */
769
770 static int
771 sync_responses(smtp_context * sx, int count, int pending_DATA)
772 {
773 address_item *addr = sx->sync_addr;
774 smtp_transport_options_block *ob =
775 (smtp_transport_options_block *)sx->tblock->options_block;
776 int yield = 0;
777
778 /* Handle the response for a MAIL command. On error, reinstate the original
779 command in big_buffer for error message use, and flush any further pending
780 responses before returning, except after I/O errors and timeouts. */
781
782 if (sx->pending_MAIL)
783 {
784 count--;
785 if (!smtp_read_response(&sx->inblock, sx->buffer, sizeof(sx->buffer),
786 '2', ob->command_timeout))
787 {
788 DEBUG(D_transport) debug_printf("bad response for MAIL\n");
789 Ustrcpy(big_buffer, mail_command); /* Fits, because it came from there! */
790 if (errno == 0 && sx->buffer[0] != 0)
791 {
792 uschar flushbuffer[4096];
793 int save_errno = 0;
794 if (sx->buffer[0] == '4')
795 {
796 save_errno = ERRNO_MAIL4XX;
797 addr->more_errno |= ((sx->buffer[1] - '0')*10 + sx->buffer[2] - '0') << 8;
798 }
799 while (count-- > 0)
800 {
801 if (!smtp_read_response(&sx->inblock, flushbuffer, sizeof(flushbuffer),
802 '2', ob->command_timeout)
803 && (errno != 0 || flushbuffer[0] == 0))
804 break;
805 }
806 errno = save_errno;
807 }
808
809 if (pending_DATA) count--; /* Number of RCPT responses to come */
810 while (count-- > 0) /* Mark any pending addrs with the host used */
811 {
812 while (addr->transport_return != PENDING_DEFER) addr = addr->next;
813 addr->host_used = sx->host;
814 addr = addr->next;
815 }
816 return -3;
817 }
818 }
819
820 if (pending_DATA) count--; /* Number of RCPT responses to come */
821
822 /* Read and handle the required number of RCPT responses, matching each one up
823 with an address by scanning for the next address whose status is PENDING_DEFER.
824 */
825
826 while (count-- > 0)
827 {
828 while (addr->transport_return != PENDING_DEFER)
829 if (!(addr = addr->next))
830 return -2;
831
832 /* The address was accepted */
833 addr->host_used = sx->host;
834
835 if (smtp_read_response(&sx->inblock, sx->buffer, sizeof(sx->buffer),
836 '2', ob->command_timeout))
837 {
838 yield |= 1;
839 addr->transport_return = PENDING_OK;
840
841 /* If af_dr_retry_exists is set, there was a routing delay on this address;
842 ensure that any address-specific retry record is expunged. We do this both
843 for the basic key and for the version that also includes the sender. */
844
845 if (testflag(addr, af_dr_retry_exists))
846 {
847 uschar *altkey = string_sprintf("%s:<%s>", addr->address_retry_key,
848 sender_address);
849 retry_add_item(addr, altkey, rf_delete);
850 retry_add_item(addr, addr->address_retry_key, rf_delete);
851 }
852 }
853
854 /* Timeout while reading the response */
855
856 else if (errno == ETIMEDOUT)
857 {
858 uschar *message = string_sprintf("SMTP timeout after RCPT TO:<%s>",
859 transport_rcpt_address(addr, sx->tblock->rcpt_include_affixes));
860 set_errno_nohost(sx->first_addr, ETIMEDOUT, message, DEFER, FALSE);
861 retry_add_item(addr, addr->address_retry_key, 0);
862 update_waiting = FALSE;
863 return -1;
864 }
865
866 /* Handle other errors in obtaining an SMTP response by returning -1. This
867 will cause all the addresses to be deferred. Restore the SMTP command in
868 big_buffer for which we are checking the response, so the error message
869 makes sense. */
870
871 else if (errno != 0 || sx->buffer[0] == 0)
872 {
873 string_format(big_buffer, big_buffer_size, "RCPT TO:<%s>",
874 transport_rcpt_address(addr, sx->tblock->rcpt_include_affixes));
875 return -2;
876 }
877
878 /* Handle SMTP permanent and temporary response codes. */
879
880 else
881 {
882 addr->message =
883 string_sprintf("SMTP error from remote mail server after RCPT TO:<%s>: "
884 "%s", transport_rcpt_address(addr, sx->tblock->rcpt_include_affixes),
885 string_printing(sx->buffer));
886 setflag(addr, af_pass_message);
887 if (!sx->verify)
888 msglog_line(sx->host, addr->message);
889
890 /* The response was 5xx */
891
892 if (sx->buffer[0] == '5')
893 {
894 addr->transport_return = FAIL;
895 yield |= 2;
896 }
897
898 /* The response was 4xx */
899
900 else
901 {
902 addr->transport_return = DEFER;
903 addr->basic_errno = ERRNO_RCPT4XX;
904 addr->more_errno |= ((sx->buffer[1] - '0')*10 + sx->buffer[2] - '0') << 8;
905
906 if (!sx->verify)
907 {
908 #ifndef DISABLE_EVENT
909 event_defer_errno = addr->more_errno;
910 msg_event_raise(US"msg:rcpt:host:defer", addr);
911 #endif
912
913 /* Log temporary errors if there are more hosts to be tried.
914 If not, log this last one in the == line. */
915
916 if (sx->host->next)
917 log_write(0, LOG_MAIN, "H=%s [%s]: %s",
918 sx->host->name, sx->host->address, addr->message);
919
920 #ifndef DISABLE_EVENT
921 else
922 msg_event_raise(US"msg:rcpt:defer", addr);
923 #endif
924
925 /* Do not put this message on the list of those waiting for specific
926 hosts, as otherwise it is likely to be tried too often. */
927
928 update_waiting = FALSE;
929
930 /* Add a retry item for the address so that it doesn't get tried again
931 too soon. If address_retry_include_sender is true, add the sender address
932 to the retry key. */
933
934 retry_add_item(addr,
935 ob->address_retry_include_sender
936 ? string_sprintf("%s:<%s>", addr->address_retry_key, sender_address)
937 : addr->address_retry_key,
938 0);
939 }
940 }
941 }
942 } /* Loop for next RCPT response */
943
944 /* Update where to start at for the next block of responses, unless we
945 have already handled all the addresses. */
946
947 if (addr) sx->sync_addr = addr->next;
948
949 /* Handle a response to DATA. If we have not had any good recipients, either
950 previously or in this block, the response is ignored. */
951
952 if (pending_DATA != 0 &&
953 !smtp_read_response(&sx->inblock, sx->buffer, sizeof(sx->buffer),
954 '3', ob->command_timeout))
955 {
956 int code;
957 uschar *msg;
958 BOOL pass_message;
959 if (pending_DATA > 0 || (yield & 1) != 0)
960 {
961 if (errno == 0 && sx->buffer[0] == '4')
962 {
963 errno = ERRNO_DATA4XX;
964 sx->first_addr->more_errno |= ((sx->buffer[1] - '0')*10 + sx->buffer[2] - '0') << 8;
965 }
966 return -3;
967 }
968 (void)check_response(sx->host, &errno, 0, sx->buffer, &code, &msg, &pass_message);
969 DEBUG(D_transport) debug_printf("%s\nerror for DATA ignored: pipelining "
970 "is in use and there were no good recipients\n", msg);
971 }
972
973 /* All responses read and handled; MAIL (if present) received 2xx and DATA (if
974 present) received 3xx. If any RCPTs were handled and yielded anything other
975 than 4xx, yield will be set non-zero. */
976
977 return yield;
978 }
979
980
981
982 /* Do the client side of smtp-level authentication */
983 /*
984 Arguments:
985 buffer EHLO response from server (gets overwritten)
986 addrlist chain of potential addresses to deliver
987 host host to deliver to
988 ob transport options
989 ibp, obp comms channel control blocks
990
991 Returns:
992 OK Success, or failed (but not required): global "smtp_authenticated" set
993 DEFER Failed authentication (and was required)
994 ERROR Internal problem
995
996 FAIL_SEND Failed communications - transmit
997 FAIL - response
998 */
999
1000 int
1001 smtp_auth(uschar *buffer, unsigned bufsize, address_item *addrlist, host_item *host,
1002 smtp_transport_options_block *ob, BOOL is_esmtp,
1003 smtp_inblock *ibp, smtp_outblock *obp)
1004 {
1005 int require_auth;
1006 uschar *fail_reason = US"server did not advertise AUTH support";
1007
1008 smtp_authenticated = FALSE;
1009 client_authenticator = client_authenticated_id = client_authenticated_sender = NULL;
1010 require_auth = verify_check_given_host(&ob->hosts_require_auth, host);
1011
1012 if (is_esmtp && !regex_AUTH) regex_AUTH =
1013 regex_must_compile(US"\\n250[\\s\\-]AUTH\\s+([\\-\\w\\s]+)(?:\\n|$)",
1014 FALSE, TRUE);
1015
1016 if (is_esmtp && regex_match_and_setup(regex_AUTH, buffer, 0, -1))
1017 {
1018 uschar *names = string_copyn(expand_nstring[1], expand_nlength[1]);
1019 expand_nmax = -1; /* reset */
1020
1021 /* Must not do this check until after we have saved the result of the
1022 regex match above. */
1023
1024 if (require_auth == OK ||
1025 verify_check_given_host(&ob->hosts_try_auth, host) == OK)
1026 {
1027 auth_instance *au;
1028 fail_reason = US"no common mechanisms were found";
1029
1030 DEBUG(D_transport) debug_printf("scanning authentication mechanisms\n");
1031
1032 /* Scan the configured authenticators looking for one which is configured
1033 for use as a client, which is not suppressed by client_condition, and
1034 whose name matches an authentication mechanism supported by the server.
1035 If one is found, attempt to authenticate by calling its client function.
1036 */
1037
1038 for (au = auths; !smtp_authenticated && au; au = au->next)
1039 {
1040 uschar *p = names;
1041 if (!au->client ||
1042 (au->client_condition != NULL &&
1043 !expand_check_condition(au->client_condition, au->name,
1044 US"client authenticator")))
1045 {
1046 DEBUG(D_transport) debug_printf("skipping %s authenticator: %s\n",
1047 au->name,
1048 (au->client)? "client_condition is false" :
1049 "not configured as a client");
1050 continue;
1051 }
1052
1053 /* Loop to scan supported server mechanisms */
1054
1055 while (*p)
1056 {
1057 int rc;
1058 int len = Ustrlen(au->public_name);
1059 while (isspace(*p)) p++;
1060
1061 if (strncmpic(au->public_name, p, len) != 0 ||
1062 (p[len] != 0 && !isspace(p[len])))
1063 {
1064 while (*p != 0 && !isspace(*p)) p++;
1065 continue;
1066 }
1067
1068 /* Found data for a listed mechanism. Call its client entry. Set
1069 a flag in the outblock so that data is overwritten after sending so
1070 that reflections don't show it. */
1071
1072 fail_reason = US"authentication attempt(s) failed";
1073 obp->authenticating = TRUE;
1074 rc = (au->info->clientcode)(au, ibp, obp,
1075 ob->command_timeout, buffer, bufsize);
1076 obp->authenticating = FALSE;
1077 DEBUG(D_transport) debug_printf("%s authenticator yielded %d\n",
1078 au->name, rc);
1079
1080 /* A temporary authentication failure must hold up delivery to
1081 this host. After a permanent authentication failure, we carry on
1082 to try other authentication methods. If all fail hard, try to
1083 deliver the message unauthenticated unless require_auth was set. */
1084
1085 switch(rc)
1086 {
1087 case OK:
1088 smtp_authenticated = TRUE; /* stops the outer loop */
1089 client_authenticator = au->name;
1090 if (au->set_client_id != NULL)
1091 client_authenticated_id = expand_string(au->set_client_id);
1092 break;
1093
1094 /* Failure after writing a command */
1095
1096 case FAIL_SEND:
1097 return FAIL_SEND;
1098
1099 /* Failure after reading a response */
1100
1101 case FAIL:
1102 if (errno != 0 || buffer[0] != '5') return FAIL;
1103 log_write(0, LOG_MAIN, "%s authenticator failed H=%s [%s] %s",
1104 au->name, host->name, host->address, buffer);
1105 break;
1106
1107 /* Failure by some other means. In effect, the authenticator
1108 decided it wasn't prepared to handle this case. Typically this
1109 is the result of "fail" in an expansion string. Do we need to
1110 log anything here? Feb 2006: a message is now put in the buffer
1111 if logging is required. */
1112
1113 case CANCELLED:
1114 if (*buffer != 0)
1115 log_write(0, LOG_MAIN, "%s authenticator cancelled "
1116 "authentication H=%s [%s] %s", au->name, host->name,
1117 host->address, buffer);
1118 break;
1119
1120 /* Internal problem, message in buffer. */
1121
1122 case ERROR:
1123 set_errno_nohost(addrlist, ERRNO_AUTHPROB, string_copy(buffer),
1124 DEFER, FALSE);
1125 return ERROR;
1126 }
1127
1128 break; /* If not authenticated, try next authenticator */
1129 } /* Loop for scanning supported server mechanisms */
1130 } /* Loop for further authenticators */
1131 }
1132 }
1133
1134 /* If we haven't authenticated, but are required to, give up. */
1135
1136 if (require_auth == OK && !smtp_authenticated)
1137 {
1138 set_errno_nohost(addrlist, ERRNO_AUTHFAIL,
1139 string_sprintf("authentication required but %s", fail_reason), DEFER,
1140 FALSE);
1141 return DEFER;
1142 }
1143
1144 return OK;
1145 }
1146
1147
1148 /* Construct AUTH appendix string for MAIL TO */
1149 /*
1150 Arguments
1151 buffer to build string
1152 addrlist chain of potential addresses to deliver
1153 ob transport options
1154
1155 Globals smtp_authenticated
1156 client_authenticated_sender
1157 Return True on error, otherwise buffer has (possibly empty) terminated string
1158 */
1159
1160 BOOL
1161 smtp_mail_auth_str(uschar *buffer, unsigned bufsize, address_item *addrlist,
1162 smtp_transport_options_block *ob)
1163 {
1164 uschar *local_authenticated_sender = authenticated_sender;
1165
1166 #ifdef notdef
1167 debug_printf("smtp_mail_auth_str: as<%s> os<%s> SA<%s>\n", authenticated_sender, ob->authenticated_sender, smtp_authenticated?"Y":"N");
1168 #endif
1169
1170 if (ob->authenticated_sender != NULL)
1171 {
1172 uschar *new = expand_string(ob->authenticated_sender);
1173 if (new == NULL)
1174 {
1175 if (!expand_string_forcedfail)
1176 {
1177 uschar *message = string_sprintf("failed to expand "
1178 "authenticated_sender: %s", expand_string_message);
1179 set_errno_nohost(addrlist, ERRNO_EXPANDFAIL, message, DEFER, FALSE);
1180 return TRUE;
1181 }
1182 }
1183 else if (new[0] != 0) local_authenticated_sender = new;
1184 }
1185
1186 /* Add the authenticated sender address if present */
1187
1188 if ((smtp_authenticated || ob->authenticated_sender_force) &&
1189 local_authenticated_sender != NULL)
1190 {
1191 string_format(buffer, bufsize, " AUTH=%s",
1192 auth_xtextencode(local_authenticated_sender,
1193 Ustrlen(local_authenticated_sender)));
1194 client_authenticated_sender = string_copy(local_authenticated_sender);
1195 }
1196 else
1197 *buffer= 0;
1198
1199 return FALSE;
1200 }
1201
1202
1203
1204 #ifdef SUPPORT_DANE
1205 /* Lookup TLSA record for host/port.
1206 Return: OK success with dnssec; DANE mode
1207 DEFER Do not use this host now, may retry later
1208 FAIL_FORCED No TLSA record; DANE not usable
1209 FAIL Do not use this connection
1210 */
1211
1212 int
1213 tlsa_lookup(const host_item * host, dns_answer * dnsa, BOOL dane_required)
1214 {
1215 /* move this out to host.c given the similarity to dns_lookup() ? */
1216 uschar buffer[300];
1217 const uschar * fullname = buffer;
1218 int rc;
1219 BOOL sec;
1220
1221 /* TLSA lookup string */
1222 (void)sprintf(CS buffer, "_%d._tcp.%.256s", host->port, host->name);
1223
1224 rc = dns_lookup(dnsa, buffer, T_TLSA, &fullname);
1225 sec = dns_is_secure(dnsa);
1226 DEBUG(D_transport)
1227 debug_printf("TLSA lookup ret %d %sDNSSEC\n", rc, sec ? "" : "not ");
1228
1229 switch (rc)
1230 {
1231 case DNS_AGAIN:
1232 return DEFER; /* just defer this TLS'd conn */
1233
1234 case DNS_SUCCEED:
1235 if (sec) return OK;
1236 log_write(0, LOG_MAIN,
1237 "DANE error: TLSA lookup for %s not DNSSEC", host->name);
1238 /*FALLTRHOUGH*/
1239
1240 case DNS_NODATA: /* no TLSA RR for this lookup */
1241 case DNS_NOMATCH: /* no records at all for this lookup */
1242 return dane_required ? FAIL : FAIL_FORCED;
1243
1244 default:
1245 case DNS_FAIL:
1246 return dane_required ? FAIL : DEFER;
1247 }
1248 }
1249 #endif
1250
1251
1252
1253 typedef struct smtp_compare_s
1254 {
1255 uschar *current_sender_address;
1256 struct transport_instance *tblock;
1257 } smtp_compare_t;
1258
1259
1260 /* Create a unique string that identifies this message, it is based on
1261 sender_address, helo_data and tls_certificate if enabled.
1262 */
1263
1264 static uschar *
1265 smtp_local_identity(uschar * sender, struct transport_instance * tblock)
1266 {
1267 address_item * addr1;
1268 uschar * if1 = US"";
1269 uschar * helo1 = US"";
1270 #ifdef SUPPORT_TLS
1271 uschar * tlsc1 = US"";
1272 #endif
1273 uschar * save_sender_address = sender_address;
1274 uschar * local_identity = NULL;
1275 smtp_transport_options_block * ob =
1276 (smtp_transport_options_block *)tblock->options_block;
1277
1278 sender_address = sender;
1279
1280 addr1 = deliver_make_addr (sender, TRUE);
1281 deliver_set_expansions(addr1);
1282
1283 if (ob->interface)
1284 if1 = expand_string(ob->interface);
1285
1286 if (ob->helo_data)
1287 helo1 = expand_string(ob->helo_data);
1288
1289 #ifdef SUPPORT_TLS
1290 if (ob->tls_certificate)
1291 tlsc1 = expand_string(ob->tls_certificate);
1292 local_identity = string_sprintf ("%s^%s^%s", if1, helo1, tlsc1);
1293 #else
1294 local_identity = string_sprintf ("%s^%s", if1, helo1);
1295 #endif
1296
1297 deliver_set_expansions(NULL);
1298 sender_address = save_sender_address;
1299
1300 return local_identity;
1301 }
1302
1303
1304
1305 /* This routine is a callback that is called from transport_check_waiting.
1306 This function will evaluate the incoming message versus the previous
1307 message. If the incoming message is using a different local identity then
1308 we will veto this new message. */
1309
1310 static BOOL
1311 smtp_are_same_identities(uschar * message_id, smtp_compare_t * s_compare)
1312 {
1313 uschar * message_local_identity,
1314 * current_local_identity,
1315 * new_sender_address;
1316
1317 current_local_identity =
1318 smtp_local_identity(s_compare->current_sender_address, s_compare->tblock);
1319
1320 if (!(new_sender_address = deliver_get_sender_address(message_id)))
1321 return 0;
1322
1323 message_local_identity =
1324 smtp_local_identity(new_sender_address, s_compare->tblock);
1325
1326 return Ustrcmp(current_local_identity, message_local_identity) == 0;
1327 }
1328
1329
1330
1331 static uschar
1332 ehlo_response(uschar * buf, uschar checks)
1333 {
1334 size_t bsize = Ustrlen(buf);
1335
1336 #ifdef SUPPORT_TLS
1337 if ( checks & OPTION_TLS
1338 && pcre_exec(regex_STARTTLS, NULL, CS buf, bsize, 0, PCRE_EOPT, NULL, 0) < 0)
1339 checks &= ~OPTION_TLS;
1340 #endif
1341
1342 if ( checks & OPTION_IGNQ
1343 && pcre_exec(regex_IGNOREQUOTA, NULL, CS buf, bsize, 0,
1344 PCRE_EOPT, NULL, 0) < 0)
1345 checks &= ~OPTION_IGNQ;
1346
1347 if ( checks & OPTION_CHUNKING
1348 && pcre_exec(regex_CHUNKING, NULL, CS buf, bsize, 0, PCRE_EOPT, NULL, 0) < 0)
1349 checks &= ~OPTION_CHUNKING;
1350
1351 #ifndef DISABLE_PRDR
1352 if ( checks & OPTION_PRDR
1353 && pcre_exec(regex_PRDR, NULL, CS buf, bsize, 0, PCRE_EOPT, NULL, 0) < 0)
1354 checks &= ~OPTION_PRDR;
1355 #endif
1356
1357 #ifdef SUPPORT_I18N
1358 if ( checks & OPTION_UTF8
1359 && pcre_exec(regex_UTF8, NULL, CS buf, bsize, 0, PCRE_EOPT, NULL, 0) < 0)
1360 checks &= ~OPTION_UTF8;
1361 #endif
1362
1363 if ( checks & OPTION_DSN
1364 && pcre_exec(regex_DSN, NULL, CS buf, bsize, 0, PCRE_EOPT, NULL, 0) < 0)
1365 checks &= ~OPTION_DSN;
1366
1367 if ( checks & OPTION_PIPE
1368 && pcre_exec(regex_PIPELINING, NULL, CS buf, bsize, 0,
1369 PCRE_EOPT, NULL, 0) < 0)
1370 checks &= ~OPTION_PIPE;
1371
1372 if ( checks & OPTION_SIZE
1373 && pcre_exec(regex_SIZE, NULL, CS buf, bsize, 0, PCRE_EOPT, NULL, 0) < 0)
1374 checks &= ~OPTION_SIZE;
1375
1376 return checks;
1377 }
1378
1379
1380
1381 /* Callback for emitting a BDAT data chunk header.
1382
1383 If given a nonzero size, first flush any buffered SMTP commands
1384 then emit the command.
1385
1386 Reap previous SMTP command responses if requested, and always reap
1387 the response from a previous BDAT command.
1388
1389 Args:
1390 tctx transport context
1391 chunk_size value for SMTP BDAT command
1392 flags
1393 tc_chunk_last add LAST option to SMTP BDAT command
1394 tc_reap_prev reap response to previous SMTP commands
1395
1396 Returns: OK or ERROR
1397 */
1398
1399 static int
1400 smtp_chunk_cmd_callback(transport_ctx * tctx, unsigned chunk_size,
1401 unsigned flags)
1402 {
1403 smtp_transport_options_block * ob =
1404 (smtp_transport_options_block *)(tctx->tblock->options_block);
1405 smtp_context * sx = tctx->smtp_context;
1406 int cmd_count = 0;
1407 int prev_cmd_count;
1408
1409 /* Write SMTP chunk header command. If not reaping responses, note that
1410 there may be more writes (like, the chunk data) done soon. */
1411
1412 if (chunk_size > 0)
1413 {
1414 if((cmd_count = smtp_write_command(&sx->outblock,
1415 flags & tc_reap_prev ? SCMD_FLUSH : SCMD_MORE,
1416 "BDAT %u%s\r\n", chunk_size, flags & tc_chunk_last ? " LAST" : "")
1417 ) < 0) return ERROR;
1418 if (flags & tc_chunk_last)
1419 data_command = string_copy(big_buffer); /* Save for later error message */
1420 }
1421
1422 prev_cmd_count = cmd_count += sx->cmd_count;
1423
1424 /* Reap responses for any previous, but not one we just emitted */
1425
1426 if (chunk_size > 0)
1427 prev_cmd_count--;
1428 if (sx->pending_BDAT)
1429 prev_cmd_count--;
1430
1431 if (flags & tc_reap_prev && prev_cmd_count > 0)
1432 {
1433 DEBUG(D_transport) debug_printf("look for %d responses"
1434 " for previous pipelined cmds\n", prev_cmd_count);
1435
1436 switch(sync_responses(sx, prev_cmd_count, 0))
1437 {
1438 case 1: /* 2xx (only) => OK */
1439 case 3: sx->good_RCPT = TRUE; /* 2xx & 5xx => OK & progress made */
1440 case 2: sx->completed_addr = TRUE; /* 5xx (only) => progress made */
1441 case 0: break; /* No 2xx or 5xx, but no probs */
1442
1443 case -1: /* Timeout on RCPT */
1444 default: return ERROR; /* I/O error, or any MAIL/DATA error */
1445 }
1446 cmd_count = 1;
1447 if (!sx->pending_BDAT)
1448 pipelining_active = FALSE;
1449 }
1450
1451 /* Reap response for an outstanding BDAT */
1452
1453 if (sx->pending_BDAT)
1454 {
1455 DEBUG(D_transport) debug_printf("look for one response for BDAT\n");
1456
1457 if (!smtp_read_response(&sx->inblock, sx->buffer, sizeof(sx->buffer), '2',
1458 ob->command_timeout))
1459 {
1460 if (errno == 0 && sx->buffer[0] == '4')
1461 {
1462 errno = ERRNO_DATA4XX; /*XXX does this actually get used? */
1463 sx->addrlist->more_errno |=
1464 ((sx->buffer[1] - '0')*10 + sx->buffer[2] - '0') << 8;
1465 }
1466 return ERROR;
1467 }
1468 cmd_count--;
1469 sx->pending_BDAT = FALSE;
1470 pipelining_active = FALSE;
1471 }
1472 else if (chunk_size > 0)
1473 sx->pending_BDAT = TRUE;
1474
1475
1476 sx->cmd_count = cmd_count;
1477 return OK;
1478 }
1479
1480
1481
1482 /*************************************************
1483 * Make connection for given message *
1484 *************************************************/
1485
1486 /*
1487 Arguments:
1488 ctx connection context
1489 suppress_tls if TRUE, don't attempt a TLS connection - this is set for
1490 a second attempt after TLS initialization fails
1491
1492 Returns: OK - the connection was made and the delivery attempted;
1493 fd is set in the conn context, tls_out set up.
1494 DEFER - the connection could not be made, or something failed
1495 while setting up the SMTP session, or there was a
1496 non-message-specific error, such as a timeout.
1497 ERROR - helo_data or add_headers or authenticated_sender is
1498 specified for this transport, and the string failed
1499 to expand
1500 */
1501 int
1502 smtp_setup_conn(smtp_context * sx, BOOL suppress_tls)
1503 {
1504 #if defined(SUPPORT_TLS) && defined(SUPPORT_DANE)
1505 dns_answer tlsa_dnsa;
1506 #endif
1507 BOOL pass_message = FALSE;
1508 uschar * message = NULL;
1509 int yield = OK;
1510 int rc;
1511
1512 sx->ob = (smtp_transport_options_block *) sx->tblock->options_block;
1513
1514 sx->lmtp = strcmpic(sx->ob->protocol, US"lmtp") == 0;
1515 sx->smtps = strcmpic(sx->ob->protocol, US"smtps") == 0;
1516 sx->ok = FALSE;
1517 sx->send_rset = TRUE;
1518 sx->send_quit = TRUE;
1519 sx->setting_up = TRUE;
1520 sx->esmtp = TRUE;
1521 sx->esmtp_sent = FALSE;
1522 #ifdef SUPPORT_I18N
1523 sx->utf8_needed = FALSE;
1524 #endif
1525 sx->dsn_all_lasthop = TRUE;
1526 #if defined(SUPPORT_TLS) && defined(SUPPORT_DANE)
1527 sx->dane = FALSE;
1528 sx->dane_required = verify_check_given_host(&sx->ob->hosts_require_dane, sx->host) == OK;
1529 #endif
1530
1531 if ((sx->max_rcpt = sx->tblock->max_addresses) == 0) sx->max_rcpt = 999999;
1532 sx->peer_offered = 0;
1533 sx->avoid_option = 0;
1534 sx->igquotstr = US"";
1535 if (!sx->helo_data) sx->helo_data = sx->ob->helo_data;
1536 #ifdef EXPERIMENTAL_DSN_INFO
1537 sx->smtp_greeting = NULL;
1538 sx->helo_response = NULL;
1539 #endif
1540
1541 smtp_command = US"initial connection";
1542 sx->buffer[0] = '\0';
1543
1544 /* Set up the buffer for reading SMTP response packets. */
1545
1546 sx->inblock.buffer = sx->inbuffer;
1547 sx->inblock.buffersize = sizeof(sx->inbuffer);
1548 sx->inblock.ptr = sx->inbuffer;
1549 sx->inblock.ptrend = sx->inbuffer;
1550
1551 /* Set up the buffer for holding SMTP commands while pipelining */
1552
1553 sx->outblock.buffer = sx->outbuffer;
1554 sx->outblock.buffersize = sizeof(sx->outbuffer);
1555 sx->outblock.ptr = sx->outbuffer;
1556 sx->outblock.cmd_count = 0;
1557 sx->outblock.authenticating = FALSE;
1558
1559 /* Reset the parameters of a TLS session. */
1560
1561 tls_out.bits = 0;
1562 tls_out.cipher = NULL; /* the one we may use for this transport */
1563 tls_out.ourcert = NULL;
1564 tls_out.peercert = NULL;
1565 tls_out.peerdn = NULL;
1566 #if defined(SUPPORT_TLS) && !defined(USE_GNUTLS)
1567 tls_out.sni = NULL;
1568 #endif
1569 tls_out.ocsp = OCSP_NOT_REQ;
1570
1571 /* Flip the legacy TLS-related variables over to the outbound set in case
1572 they're used in the context of the transport. Don't bother resetting
1573 afterward (when being used by a transport) as we're in a subprocess.
1574 For verify, unflipped once the callout is dealt with */
1575
1576 tls_modify_variables(&tls_out);
1577
1578 #ifndef SUPPORT_TLS
1579 if (sx->smtps)
1580 {
1581 set_errno_nohost(sx->addrlist, ERRNO_TLSFAILURE, US"TLS support not available",
1582 DEFER, FALSE);
1583 return ERROR;
1584 }
1585 #endif
1586
1587 /* Make a connection to the host if this isn't a continued delivery, and handle
1588 the initial interaction and HELO/EHLO/LHLO. Connect timeout errors are handled
1589 specially so they can be identified for retries. */
1590
1591 if (!continue_hostname)
1592 {
1593 if (sx->verify)
1594 HDEBUG(D_verify) debug_printf("interface=%s port=%d\n", sx->interface, sx->port);
1595
1596 /* Get the actual port the connection will use, into sx->host */
1597
1598 smtp_port_for_connect(sx->host, sx->port);
1599
1600 #if defined(SUPPORT_TLS) && defined(SUPPORT_DANE)
1601 /* Do TLSA lookup for DANE */
1602 {
1603 tls_out.dane_verified = FALSE;
1604 tls_out.tlsa_usage = 0;
1605
1606 if (sx->host->dnssec == DS_YES)
1607 {
1608 if( sx->dane_required
1609 || verify_check_given_host(&sx->ob->hosts_try_dane, sx->host) == OK
1610 )
1611 switch (rc = tlsa_lookup(sx->host, &tlsa_dnsa, sx->dane_required))
1612 {
1613 case OK: sx->dane = TRUE;
1614 sx->ob->tls_tempfail_tryclear = FALSE;
1615 break;
1616 case FAIL_FORCED: break;
1617 default: set_errno_nohost(sx->addrlist, ERRNO_DNSDEFER,
1618 string_sprintf("DANE error: tlsa lookup %s",
1619 rc == DEFER ? "DEFER" : "FAIL"),
1620 rc, FALSE);
1621 (void) event_raise(sx->tblock->event_action,
1622 US"dane:fail", sx->dane_required
1623 ? US"dane-required" : US"dnssec-invalid");
1624 return rc;
1625 }
1626 }
1627 else if (sx->dane_required)
1628 {
1629 set_errno_nohost(sx->addrlist, ERRNO_DNSDEFER,
1630 string_sprintf("DANE error: %s lookup not DNSSEC", sx->host->name),
1631 FAIL, FALSE);
1632 (void) event_raise(sx->tblock->event_action,
1633 US"dane:fail", US"dane-required");
1634 return FAIL;
1635 }
1636 }
1637 #endif /*DANE*/
1638
1639 /* Make the TCP connection */
1640
1641 sx->inblock.sock = sx->outblock.sock =
1642 smtp_connect(sx->host, sx->host_af, sx->interface,
1643 sx->ob->connect_timeout, sx->tblock);
1644
1645 if (sx->inblock.sock < 0)
1646 {
1647 uschar * msg = NULL;
1648 if (sx->verify)
1649 {
1650 msg = US strerror(errno);
1651 HDEBUG(D_verify) debug_printf("connect: %s\n", msg);
1652 }
1653 set_errno_nohost(sx->addrlist,
1654 errno == ETIMEDOUT ? ERRNO_CONNECTTIMEOUT : errno,
1655 sx->verify ? string_sprintf("could not connect: %s", msg)
1656 : NULL,
1657 DEFER, FALSE);
1658 sx->send_quit = FALSE;
1659 return DEFER;
1660 }
1661
1662 /* Expand the greeting message while waiting for the initial response. (Makes
1663 sense if helo_data contains ${lookup dnsdb ...} stuff). The expansion is
1664 delayed till here so that $sending_interface and $sending_port are set. */
1665
1666 if (sx->helo_data)
1667 if (!(sx->helo_data = expand_string(sx->helo_data)))
1668 if (sx->verify)
1669 log_write(0, LOG_MAIN|LOG_PANIC,
1670 "<%s>: failed to expand transport's helo_data value for callout: %s",
1671 sx->addrlist->address, expand_string_message);
1672
1673 #ifdef SUPPORT_I18N
1674 if (sx->helo_data)
1675 {
1676 expand_string_message = NULL;
1677 if ((sx->helo_data = string_domain_utf8_to_alabel(sx->helo_data,
1678 &expand_string_message)),
1679 expand_string_message)
1680 if (sx->verify)
1681 log_write(0, LOG_MAIN|LOG_PANIC,
1682 "<%s>: failed to expand transport's helo_data value for callout: %s",
1683 sx->addrlist->address, expand_string_message);
1684 else
1685 sx->helo_data = NULL;
1686 }
1687 #endif
1688
1689 /* The first thing is to wait for an initial OK response. The dreaded "goto"
1690 is nevertheless a reasonably clean way of programming this kind of logic,
1691 where you want to escape on any error. */
1692
1693 if (!sx->smtps)
1694 {
1695 BOOL good_response;
1696
1697 #ifdef TCP_QUICKACK
1698 (void) setsockopt(sx->inblock.sock, IPPROTO_TCP, TCP_QUICKACK, US &off, sizeof(off));
1699 #endif
1700 good_response = smtp_read_response(&sx->inblock, sx->buffer, sizeof(sx->buffer),
1701 '2', sx->ob->command_timeout);
1702 #ifdef EXPERIMENTAL_DSN_INFO
1703 sx->smtp_greeting = string_copy(sx->buffer);
1704 #endif
1705 if (!good_response) goto RESPONSE_FAILED;
1706
1707 #ifndef DISABLE_EVENT
1708 {
1709 uschar * s;
1710 lookup_dnssec_authenticated = sx->host->dnssec==DS_YES ? US"yes"
1711 : sx->host->dnssec==DS_NO ? US"no" : NULL;
1712 s = event_raise(sx->tblock->event_action, US"smtp:connect", sx->buffer);
1713 if (s)
1714 {
1715 set_errno_nohost(sx->addrlist, ERRNO_EXPANDFAIL,
1716 string_sprintf("deferred by smtp:connect event expansion: %s", s),
1717 DEFER, FALSE);
1718 yield = DEFER;
1719 goto SEND_QUIT;
1720 }
1721 }
1722 #endif
1723
1724 /* Now check if the helo_data expansion went well, and sign off cleanly if
1725 it didn't. */
1726
1727 if (!sx->helo_data)
1728 {
1729 message = string_sprintf("failed to expand helo_data: %s",
1730 expand_string_message);
1731 set_errno_nohost(sx->addrlist, ERRNO_EXPANDFAIL, message, DEFER, FALSE);
1732 yield = DEFER;
1733 goto SEND_QUIT;
1734 }
1735 }
1736
1737 /** Debugging without sending a message
1738 sx->addrlist->transport_return = DEFER;
1739 goto SEND_QUIT;
1740 **/
1741
1742 /* Errors that occur after this point follow an SMTP command, which is
1743 left in big_buffer by smtp_write_command() for use in error messages. */
1744
1745 smtp_command = big_buffer;
1746
1747 /* Tell the remote who we are...
1748
1749 February 1998: A convention has evolved that ESMTP-speaking MTAs include the
1750 string "ESMTP" in their greeting lines, so make Exim send EHLO if the
1751 greeting is of this form. The assumption was that the far end supports it
1752 properly... but experience shows that there are some that give 5xx responses,
1753 even though the banner includes "ESMTP" (there's a bloody-minded one that
1754 says "ESMTP not spoken here"). Cope with that case.
1755
1756 September 2000: Time has passed, and it seems reasonable now to always send
1757 EHLO at the start. It is also convenient to make the change while installing
1758 the TLS stuff.
1759
1760 July 2003: Joachim Wieland met a broken server that advertises "PIPELINING"
1761 but times out after sending MAIL FROM, RCPT TO and DATA all together. There
1762 would be no way to send out the mails, so there is now a host list
1763 "hosts_avoid_esmtp" that disables ESMTP for special hosts and solves the
1764 PIPELINING problem as well. Maybe it can also be useful to cure other
1765 problems with broken servers.
1766
1767 Exim originally sent "Helo" at this point and ran for nearly a year that way.
1768 Then somebody tried it with a Microsoft mailer... It seems that all other
1769 mailers use upper case for some reason (the RFC is quite clear about case
1770 independence) so, for peace of mind, I gave in. */
1771
1772 sx->esmtp = verify_check_given_host(&sx->ob->hosts_avoid_esmtp, sx->host) != OK;
1773
1774 /* Alas; be careful, since this goto is not an error-out, so conceivably
1775 we might set data between here and the target which we assume to exist
1776 and be usable. I can see this coming back to bite us. */
1777 #ifdef SUPPORT_TLS
1778 if (sx->smtps)
1779 {
1780 smtp_peer_options |= OPTION_TLS;
1781 suppress_tls = FALSE;
1782 sx->ob->tls_tempfail_tryclear = FALSE;
1783 smtp_command = US"SSL-on-connect";
1784 goto TLS_NEGOTIATE;
1785 }
1786 #endif
1787
1788 if (sx->esmtp)
1789 {
1790 if (smtp_write_command(&sx->outblock, SCMD_FLUSH, "%s %s\r\n",
1791 sx->lmtp ? "LHLO" : "EHLO", sx->helo_data) < 0)
1792 goto SEND_FAILED;
1793 sx->esmtp_sent = TRUE;
1794 if (!smtp_read_response(&sx->inblock, sx->buffer, sizeof(sx->buffer), '2',
1795 sx->ob->command_timeout))
1796 {
1797 if (errno != 0 || sx->buffer[0] == 0 || sx->lmtp)
1798 {
1799 #ifdef EXPERIMENTAL_DSN_INFO
1800 sx->helo_response = string_copy(sx->buffer);
1801 #endif
1802 goto RESPONSE_FAILED;
1803 }
1804 sx->esmtp = FALSE;
1805 }
1806 #ifdef EXPERIMENTAL_DSN_INFO
1807 sx->helo_response = string_copy(sx->buffer);
1808 #endif
1809 }
1810 else
1811 DEBUG(D_transport)
1812 debug_printf("not sending EHLO (host matches hosts_avoid_esmtp)\n");
1813
1814 if (!sx->esmtp)
1815 {
1816 BOOL good_response;
1817 int n = sizeof(sx->buffer);
1818 uschar * rsp = sx->buffer;
1819
1820 if (sx->esmtp_sent && (n = Ustrlen(sx->buffer)) < sizeof(sx->buffer)/2)
1821 { rsp = sx->buffer + n + 1; n = sizeof(sx->buffer) - n; }
1822
1823 if (smtp_write_command(&sx->outblock, SCMD_FLUSH, "HELO %s\r\n", sx->helo_data) < 0)
1824 goto SEND_FAILED;
1825 good_response = smtp_read_response(&sx->inblock, rsp, n,
1826 '2', sx->ob->command_timeout);
1827 #ifdef EXPERIMENTAL_DSN_INFO
1828 sx->helo_response = string_copy(rsp);
1829 #endif
1830 if (!good_response)
1831 {
1832 /* Handle special logging for a closed connection after HELO
1833 when had previously sent EHLO */
1834
1835 if (rsp != sx->buffer && rsp[0] == 0 && (errno == 0 || errno == ECONNRESET))
1836 {
1837 errno = ERRNO_SMTPCLOSED;
1838 goto EHLOHELO_FAILED;
1839 }
1840 memmove(sx->buffer, rsp, Ustrlen(rsp));
1841 goto RESPONSE_FAILED;
1842 }
1843 }
1844
1845 sx->avoid_option = sx->peer_offered = smtp_peer_options = 0;
1846
1847 if (sx->esmtp || sx->lmtp)
1848 {
1849 sx->peer_offered = ehlo_response(sx->buffer,
1850 OPTION_TLS /* others checked later */
1851 );
1852
1853 /* Set tls_offered if the response to EHLO specifies support for STARTTLS. */
1854
1855 #ifdef SUPPORT_TLS
1856 smtp_peer_options |= sx->peer_offered & OPTION_TLS;
1857 #endif
1858 }
1859 }
1860
1861 /* For continuing deliveries down the same channel, having re-exec'd the socket
1862 is the standard input; for a socket held open from verify it is recorded
1863 in the cutthrough context block. Either way we don't need to redo EHLO here
1864 (but may need to do so for TLS - see below).
1865 Set up the pointer to where subsequent commands will be left, for
1866 error messages. Note that smtp_peer_options will have been
1867 set from the command line if they were set in the process that passed the
1868 connection on. */
1869
1870 /*XXX continue case needs to propagate DSN_INFO, prob. in deliver.c
1871 as the continue goes via transport_pass_socket() and doublefork and exec.
1872 It does not wait. Unclear how we keep separate host's responses
1873 separate - we could match up by host ip+port as a bodge. */
1874
1875 else
1876 {
1877 if (cutthrough.fd >= 0 && cutthrough.callout_hold_only)
1878 {
1879 sx->inblock.sock = sx->outblock.sock = cutthrough.fd;
1880 sx->host->port = sx->port = cutthrough.host.port;
1881 }
1882 else
1883 {
1884 sx->inblock.sock = sx->outblock.sock = 0; /* stdin */
1885 smtp_port_for_connect(sx->host, sx->port); /* Record the port that was used */
1886 }
1887 smtp_command = big_buffer;
1888 sx->helo_data = NULL; /* ensure we re-expand ob->helo_data */
1889
1890 /* For a continued connection with TLS being proxied for us, or a
1891 held-open verify connection with TLS, nothing more to do. */
1892
1893 if ( continue_proxy_cipher
1894 || (cutthrough.fd >= 0 && cutthrough.callout_hold_only && cutthrough.is_tls)
1895 )
1896 {
1897 sx->peer_offered = smtp_peer_options;
1898 pipelining_active = !!(smtp_peer_options & OPTION_PIPE);
1899 HDEBUG(D_transport) debug_printf("continued connection, %s TLS\n",
1900 continue_proxy_cipher ? "proxied" : "verify conn with");
1901 return OK;
1902 }
1903 HDEBUG(D_transport) debug_printf("continued connection, no TLS\n");
1904 }
1905
1906 /* If TLS is available on this connection, whether continued or not, attempt to
1907 start up a TLS session, unless the host is in hosts_avoid_tls. If successful,
1908 send another EHLO - the server may give a different answer in secure mode. We
1909 use a separate buffer for reading the response to STARTTLS so that if it is
1910 negative, the original EHLO data is available for subsequent analysis, should
1911 the client not be required to use TLS. If the response is bad, copy the buffer
1912 for error analysis. */
1913
1914 #ifdef SUPPORT_TLS
1915 if ( smtp_peer_options & OPTION_TLS
1916 && !suppress_tls
1917 && verify_check_given_host(&sx->ob->hosts_avoid_tls, sx->host) != OK
1918 && ( !sx->verify
1919 || verify_check_given_host(&sx->ob->hosts_verify_avoid_tls, sx->host) != OK
1920 ) )
1921 {
1922 uschar buffer2[4096];
1923 if (smtp_write_command(&sx->outblock, SCMD_FLUSH, "STARTTLS\r\n") < 0)
1924 goto SEND_FAILED;
1925
1926 /* If there is an I/O error, transmission of this message is deferred. If
1927 there is a temporary rejection of STARRTLS and tls_tempfail_tryclear is
1928 false, we also defer. However, if there is a temporary rejection of STARTTLS
1929 and tls_tempfail_tryclear is true, or if there is an outright rejection of
1930 STARTTLS, we carry on. This means we will try to send the message in clear,
1931 unless the host is in hosts_require_tls (tested below). */
1932
1933 if (!smtp_read_response(&sx->inblock, buffer2, sizeof(buffer2), '2',
1934 sx->ob->command_timeout))
1935 {
1936 if ( errno != 0
1937 || buffer2[0] == 0
1938 || (buffer2[0] == '4' && !sx->ob->tls_tempfail_tryclear)
1939 )
1940 {
1941 Ustrncpy(sx->buffer, buffer2, sizeof(sx->buffer));
1942 sx->buffer[sizeof(sx->buffer)-1] = '\0';
1943 goto RESPONSE_FAILED;
1944 }
1945 }
1946
1947 /* STARTTLS accepted: try to negotiate a TLS session. */
1948
1949 else
1950 TLS_NEGOTIATE:
1951 {
1952 address_item * addr;
1953 uschar * errstr;
1954 int rc = tls_client_start(sx->inblock.sock, sx->host, sx->addrlist, sx->tblock,
1955 # ifdef SUPPORT_DANE
1956 sx->dane ? &tlsa_dnsa : NULL,
1957 # endif
1958 &errstr);
1959
1960 /* TLS negotiation failed; give an error. From outside, this function may
1961 be called again to try in clear on a new connection, if the options permit
1962 it for this host. */
1963
1964 if (rc != OK)
1965 {
1966 # ifdef SUPPORT_DANE
1967 if (sx->dane)
1968 {
1969 log_write(0, LOG_MAIN,
1970 "DANE attempt failed; TLS connection to %s [%s]: %s",
1971 sx->host->name, sx->host->address, errstr);
1972 (void) event_raise(sx->tblock->event_action,
1973 US"dane:fail", US"validation-failure"); /* could do with better detail */
1974 }
1975 # endif
1976
1977 errno = ERRNO_TLSFAILURE;
1978 message = string_sprintf("TLS session: %s", errstr);
1979 sx->send_quit = FALSE;
1980 goto TLS_FAILED;
1981 }
1982
1983 /* TLS session is set up */
1984
1985 smtp_peer_options_wrap = smtp_peer_options;
1986 for (addr = sx->addrlist; addr; addr = addr->next)
1987 if (addr->transport_return == PENDING_DEFER)
1988 {
1989 addr->cipher = tls_out.cipher;
1990 addr->ourcert = tls_out.ourcert;
1991 addr->peercert = tls_out.peercert;
1992 addr->peerdn = tls_out.peerdn;
1993 addr->ocsp = tls_out.ocsp;
1994 }
1995 }
1996 }
1997
1998 /* if smtps, we'll have smtp_command set to something else; always safe to
1999 reset it here. */
2000 smtp_command = big_buffer;
2001
2002 /* If we started TLS, redo the EHLO/LHLO exchange over the secure channel. If
2003 helo_data is null, we are dealing with a connection that was passed from
2004 another process, and so we won't have expanded helo_data above. We have to
2005 expand it here. $sending_ip_address and $sending_port are set up right at the
2006 start of the Exim process (in exim.c). */
2007
2008 if (tls_out.active >= 0)
2009 {
2010 char *greeting_cmd;
2011 BOOL good_response;
2012
2013 if (!sx->helo_data && !(sx->helo_data = expand_string(sx->ob->helo_data)))
2014 {
2015 uschar *message = string_sprintf("failed to expand helo_data: %s",
2016 expand_string_message);
2017 set_errno_nohost(sx->addrlist, ERRNO_EXPANDFAIL, message, DEFER, FALSE);
2018 yield = DEFER;
2019 goto SEND_QUIT;
2020 }
2021
2022 /* For SMTPS we need to wait for the initial OK response. */
2023 if (sx->smtps)
2024 {
2025 good_response = smtp_read_response(&sx->inblock, sx->buffer, sizeof(sx->buffer),
2026 '2', sx->ob->command_timeout);
2027 #ifdef EXPERIMENTAL_DSN_INFO
2028 sx->smtp_greeting = string_copy(sx->buffer);
2029 #endif
2030 if (!good_response) goto RESPONSE_FAILED;
2031 }
2032
2033 if (sx->esmtp)
2034 greeting_cmd = "EHLO";
2035 else
2036 {
2037 greeting_cmd = "HELO";
2038 DEBUG(D_transport)
2039 debug_printf("not sending EHLO (host matches hosts_avoid_esmtp)\n");
2040 }
2041
2042 if (smtp_write_command(&sx->outblock, SCMD_FLUSH, "%s %s\r\n",
2043 sx->lmtp ? "LHLO" : greeting_cmd, sx->helo_data) < 0)
2044 goto SEND_FAILED;
2045 good_response = smtp_read_response(&sx->inblock, sx->buffer, sizeof(sx->buffer),
2046 '2', sx->ob->command_timeout);
2047 #ifdef EXPERIMENTAL_DSN_INFO
2048 sx->helo_response = string_copy(sx->buffer);
2049 #endif
2050 if (!good_response) goto RESPONSE_FAILED;
2051 smtp_peer_options = 0;
2052 }
2053
2054 /* If the host is required to use a secure channel, ensure that we
2055 have one. */
2056
2057 else if ( sx->smtps
2058 # ifdef SUPPORT_DANE
2059 || sx->dane
2060 # endif
2061 || verify_check_given_host(&sx->ob->hosts_require_tls, sx->host) == OK
2062 )
2063 {
2064 errno = ERRNO_TLSREQUIRED;
2065 message = string_sprintf("a TLS session is required, but %s",
2066 smtp_peer_options & OPTION_TLS
2067 ? "an attempt to start TLS failed" : "the server did not offer TLS support");
2068 # ifdef SUPPORT_DANE
2069 if (sx->dane)
2070 (void) event_raise(sx->tblock->event_action, US"dane:fail",
2071 smtp_peer_options & OPTION_TLS
2072 ? US"validation-failure" /* could do with better detail */
2073 : US"starttls-not-supported");
2074 # endif
2075 goto TLS_FAILED;
2076 }
2077 #endif /*SUPPORT_TLS*/
2078
2079 /* If TLS is active, we have just started it up and re-done the EHLO command,
2080 so its response needs to be analyzed. If TLS is not active and this is a
2081 continued session down a previously-used socket, we haven't just done EHLO, so
2082 we skip this. */
2083
2084 if (continue_hostname == NULL
2085 #ifdef SUPPORT_TLS
2086 || tls_out.active >= 0
2087 #endif
2088 )
2089 {
2090 if (sx->esmtp || sx->lmtp)
2091 {
2092 sx->peer_offered = ehlo_response(sx->buffer,
2093 0 /* no TLS */
2094 | (sx->lmtp && sx->ob->lmtp_ignore_quota ? OPTION_IGNQ : 0)
2095 | OPTION_CHUNKING
2096 | OPTION_PRDR
2097 #ifdef SUPPORT_I18N
2098 | (sx->addrlist->prop.utf8_msg ? OPTION_UTF8 : 0)
2099 /*XXX if we hand peercaps on to continued-conn processes,
2100 must not depend on this addr */
2101 #endif
2102 | OPTION_DSN
2103 | OPTION_PIPE
2104 | (sx->ob->size_addition >= 0 ? OPTION_SIZE : 0)
2105 );
2106
2107 /* Set for IGNOREQUOTA if the response to LHLO specifies support and the
2108 lmtp_ignore_quota option was set. */
2109
2110 sx->igquotstr = sx->peer_offered & OPTION_IGNQ ? US" IGNOREQUOTA" : US"";
2111
2112 /* If the response to EHLO specified support for the SIZE parameter, note
2113 this, provided size_addition is non-negative. */
2114
2115 smtp_peer_options |= sx->peer_offered & OPTION_SIZE;
2116
2117 /* Note whether the server supports PIPELINING. If hosts_avoid_esmtp matched
2118 the current host, esmtp will be false, so PIPELINING can never be used. If
2119 the current host matches hosts_avoid_pipelining, don't do it. */
2120
2121 if ( sx->peer_offered & OPTION_PIPE
2122 && verify_check_given_host(&sx->ob->hosts_avoid_pipelining, sx->host) != OK)
2123 smtp_peer_options |= OPTION_PIPE;
2124
2125 DEBUG(D_transport) debug_printf("%susing PIPELINING\n",
2126 smtp_peer_options & OPTION_PIPE ? "" : "not ");
2127
2128 if ( sx->peer_offered & OPTION_CHUNKING
2129 && verify_check_given_host(&sx->ob->hosts_try_chunking, sx->host) != OK)
2130 sx->peer_offered &= ~OPTION_CHUNKING;
2131
2132 if (sx->peer_offered & OPTION_CHUNKING)
2133 {DEBUG(D_transport) debug_printf("CHUNKING usable\n");}
2134
2135 #ifndef DISABLE_PRDR
2136 if ( sx->peer_offered & OPTION_PRDR
2137 && verify_check_given_host(&sx->ob->hosts_try_prdr, sx->host) != OK)
2138 sx->peer_offered &= ~OPTION_PRDR;
2139
2140 if (sx->peer_offered & OPTION_PRDR)
2141 {DEBUG(D_transport) debug_printf("PRDR usable\n");}
2142 #endif
2143
2144 /* Note if the server supports DSN */
2145 smtp_peer_options |= sx->peer_offered & OPTION_DSN;
2146 DEBUG(D_transport) debug_printf("%susing DSN\n",
2147 sx->peer_offered & OPTION_DSN ? "" : "not ");
2148
2149 /* Note if the response to EHLO specifies support for the AUTH extension.
2150 If it has, check that this host is one we want to authenticate to, and do
2151 the business. The host name and address must be available when the
2152 authenticator's client driver is running. */
2153
2154 switch (yield = smtp_auth(sx->buffer, sizeof(sx->buffer), sx->addrlist, sx->host,
2155 sx->ob, sx->esmtp, &sx->inblock, &sx->outblock))
2156 {
2157 default: goto SEND_QUIT;
2158 case OK: break;
2159 case FAIL_SEND: goto SEND_FAILED;
2160 case FAIL: goto RESPONSE_FAILED;
2161 }
2162 }
2163 }
2164 pipelining_active = !!(smtp_peer_options & OPTION_PIPE);
2165
2166 /* The setting up of the SMTP call is now complete. Any subsequent errors are
2167 message-specific. */
2168
2169 sx->setting_up = FALSE;
2170
2171 #ifdef SUPPORT_I18N
2172 if (sx->addrlist->prop.utf8_msg)
2173 {
2174 sx->utf8_needed = !sx->addrlist->prop.utf8_downcvt
2175 && !sx->addrlist->prop.utf8_downcvt_maybe;
2176 DEBUG(D_transport) if (!sx->utf8_needed)
2177 debug_printf("utf8: %s downconvert\n",
2178 sx->addrlist->prop.utf8_downcvt ? "mandatory" : "optional");
2179 }
2180
2181 /* If this is an international message we need the host to speak SMTPUTF8 */
2182 if (sx->utf8_needed && !(sx->peer_offered & OPTION_UTF8))
2183 {
2184 errno = ERRNO_UTF8_FWD;
2185 goto RESPONSE_FAILED;
2186 }
2187 #endif
2188
2189 return OK;
2190
2191
2192 {
2193 int code;
2194
2195 RESPONSE_FAILED:
2196 message = NULL;
2197 sx->send_quit = check_response(sx->host, &errno, sx->addrlist->more_errno,
2198 sx->buffer, &code, &message, &pass_message);
2199 goto FAILED;
2200
2201 SEND_FAILED:
2202 code = '4';
2203 message = US string_sprintf("send() to %s [%s] failed: %s",
2204 sx->host->name, sx->host->address, strerror(errno));
2205 sx->send_quit = FALSE;
2206 goto FAILED;
2207
2208 EHLOHELO_FAILED:
2209 code = '4';
2210 message = string_sprintf("Remote host closed connection in response to %s"
2211 " (EHLO response was: %s)", smtp_command, sx->buffer);
2212 sx->send_quit = FALSE;
2213 goto FAILED;
2214
2215 /* This label is jumped to directly when a TLS negotiation has failed,
2216 or was not done for a host for which it is required. Values will be set
2217 in message and errno, and setting_up will always be true. Treat as
2218 a temporary error. */
2219
2220 #ifdef SUPPORT_TLS
2221 TLS_FAILED:
2222 code = '4';
2223 goto FAILED;
2224 #endif
2225
2226 /* The failure happened while setting up the call; see if the failure was
2227 a 5xx response (this will either be on connection, or following HELO - a 5xx
2228 after EHLO causes it to try HELO). If so, and there are no more hosts to try,
2229 fail all addresses, as this host is never going to accept them. For other
2230 errors during setting up (timeouts or whatever), defer all addresses, and
2231 yield DEFER, so that the host is not tried again for a while.
2232
2233 XXX This peeking for another host feels like a layering violation. We want
2234 to note the host as unusable, but down here we shouldn't know if this was
2235 the last host to try for the addr(list). Perhaps the upper layer should be
2236 the one to do set_errno() ? The problem is that currently the addr is where
2237 errno etc. are stashed, but until we run out of hosts to try the errors are
2238 host-specific. Maybe we should enhance the host_item definition? */
2239
2240 FAILED:
2241 sx->ok = FALSE; /* For when reached by GOTO */
2242 set_errno(sx->addrlist, errno, message,
2243 sx->host->next
2244 ? DEFER
2245 : code == '5'
2246 #ifdef SUPPORT_I18N
2247 || errno == ERRNO_UTF8_FWD
2248 #endif
2249 ? FAIL : DEFER,
2250 pass_message, sx->host
2251 #ifdef EXPERIMENTAL_DSN_INFO
2252 , sx->smtp_greeting, sx->helo_response
2253 #endif
2254 );
2255 yield = DEFER;
2256 }
2257
2258
2259 SEND_QUIT:
2260
2261 if (sx->send_quit)
2262 (void)smtp_write_command(&sx->outblock, SCMD_FLUSH, "QUIT\r\n");
2263
2264 #ifdef SUPPORT_TLS
2265 tls_close(FALSE, TLS_SHUTDOWN_NOWAIT);
2266 #endif
2267
2268 /* Close the socket, and return the appropriate value, first setting
2269 works because the NULL setting is passed back to the calling process, and
2270 remote_max_parallel is forced to 1 when delivering over an existing connection,
2271 */
2272
2273 HDEBUG(D_transport|D_acl|D_v) debug_printf_indent(" SMTP(close)>>\n");
2274 if (sx->send_quit)
2275 {
2276 shutdown(sx->outblock.sock, SHUT_WR);
2277 if (fcntl(sx->inblock.sock, F_SETFL, O_NONBLOCK) == 0)
2278 for (rc = 16; read(sx->inblock.sock, sx->inbuffer, sizeof(sx->inbuffer)) > 0 && rc > 0;)
2279 rc--; /* drain socket */
2280 sx->send_quit = FALSE;
2281 }
2282 (void)close(sx->inblock.sock);
2283 sx->inblock.sock = sx->outblock.sock = -1;
2284
2285 #ifndef DISABLE_EVENT
2286 (void) event_raise(sx->tblock->event_action, US"tcp:close", NULL);
2287 #endif
2288
2289 continue_transport = NULL;
2290 continue_hostname = NULL;
2291 return yield;
2292 }
2293
2294
2295
2296
2297 /* Create the string of options that will be appended to the MAIL FROM:
2298 in the connection context buffer */
2299
2300 static int
2301 build_mailcmd_options(smtp_context * sx, address_item * addrlist)
2302 {
2303 uschar * p = sx->buffer;
2304 address_item * addr;
2305 int address_count;
2306
2307 *p = 0;
2308
2309 /* If we know the receiving MTA supports the SIZE qualification, and we know it,
2310 send it, adding something to the message size to allow for imprecision
2311 and things that get added en route. Exim keeps the number of lines
2312 in a message, so we can give an accurate value for the original message, but we
2313 need some additional to handle added headers. (Double "." characters don't get
2314 included in the count.) */
2315
2316 if ( message_size > 0
2317 && sx->peer_offered & OPTION_SIZE && !(sx->avoid_option & OPTION_SIZE))
2318 {
2319 /*XXX problem here under spool_files_wireformat?
2320 Or just forget about lines? Or inflate by a fixed proportion? */
2321
2322 sprintf(CS p, " SIZE=%d", message_size+message_linecount+sx->ob->size_addition);
2323 while (*p) p++;
2324 }
2325
2326 #ifndef DISABLE_PRDR
2327 /* If it supports Per-Recipient Data Reponses, and we have omre than one recipient,
2328 request that */
2329
2330 sx->prdr_active = FALSE;
2331 if (sx->peer_offered & OPTION_PRDR)
2332 for (addr = addrlist; addr; addr = addr->next)
2333 if (addr->transport_return == PENDING_DEFER)
2334 {
2335 for (addr = addr->next; addr; addr = addr->next)
2336 if (addr->transport_return == PENDING_DEFER)
2337 { /* at least two recipients to send */
2338 sx->prdr_active = TRUE;
2339 sprintf(CS p, " PRDR"); p += 5;
2340 break;
2341 }
2342 break;
2343 }
2344 #endif
2345
2346 #ifdef SUPPORT_I18N
2347 /* If it supports internationalised messages, and this meesage need that,
2348 request it */
2349
2350 if ( sx->peer_offered & OPTION_UTF8
2351 && addrlist->prop.utf8_msg
2352 && !addrlist->prop.utf8_downcvt
2353 )
2354 Ustrcpy(p, " SMTPUTF8"), p += 9;
2355 #endif
2356
2357 /* check if all addresses have DSN-lasthop flag; do not send RET and ENVID if so */
2358 for (sx->dsn_all_lasthop = TRUE, addr = addrlist, address_count = 0;
2359 addr && address_count < sx->max_rcpt;
2360 addr = addr->next) if (addr->transport_return == PENDING_DEFER)
2361 {
2362 address_count++;
2363 if (!(addr->dsn_flags & rf_dsnlasthop))
2364 {
2365 sx->dsn_all_lasthop = FALSE;
2366 break;
2367 }
2368 }
2369
2370 /* Add any DSN flags to the mail command */
2371
2372 if (sx->peer_offered & OPTION_DSN && !sx->dsn_all_lasthop)
2373 {
2374 if (dsn_ret == dsn_ret_hdrs)
2375 { Ustrcpy(p, " RET=HDRS"); p += 9; }
2376 else if (dsn_ret == dsn_ret_full)
2377 { Ustrcpy(p, " RET=FULL"); p += 9; }
2378
2379 if (dsn_envid)
2380 {
2381 string_format(p, sizeof(sx->buffer) - (p-sx->buffer), " ENVID=%s", dsn_envid);
2382 while (*p) p++;
2383 }
2384 }
2385
2386 /* If an authenticated_sender override has been specified for this transport
2387 instance, expand it. If the expansion is forced to fail, and there was already
2388 an authenticated_sender for this message, the original value will be used.
2389 Other expansion failures are serious. An empty result is ignored, but there is
2390 otherwise no check - this feature is expected to be used with LMTP and other
2391 cases where non-standard addresses (e.g. without domains) might be required. */
2392
2393 if (smtp_mail_auth_str(p, sizeof(sx->buffer) - (p-sx->buffer), addrlist, sx->ob))
2394 return ERROR;
2395
2396 return OK;
2397 }
2398
2399
2400 static void
2401 build_rcptcmd_options(smtp_context * sx, const address_item * addr)
2402 {
2403 uschar * p = sx->buffer;
2404 *p = 0;
2405
2406 /* Add any DSN flags to the rcpt command */
2407
2408 if (sx->peer_offered & OPTION_DSN && !(addr->dsn_flags & rf_dsnlasthop))
2409 {
2410 if (addr->dsn_flags & rf_dsnflags)
2411 {
2412 int i;
2413 BOOL first = TRUE;
2414
2415 Ustrcpy(p, " NOTIFY=");
2416 while (*p) p++;
2417 for (i = 0; i < nelem(rf_list); i++) if (addr->dsn_flags & rf_list[i])
2418 {
2419 if (!first) *p++ = ',';
2420 first = FALSE;
2421 Ustrcpy(p, rf_names[i]);
2422 while (*p) p++;
2423 }
2424 }
2425
2426 if (addr->dsn_orcpt)
2427 {
2428 string_format(p, sizeof(sx->buffer) - (p-sx->buffer), " ORCPT=%s",
2429 addr->dsn_orcpt);
2430 while (*p) p++;
2431 }
2432 }
2433 }
2434
2435
2436
2437 /*
2438 Return:
2439 0 good, rcpt results in addr->transport_return (PENDING_OK, DEFER, FAIL)
2440 -1 MAIL response error
2441 -2 any non-MAIL read i/o error
2442 -3 non-MAIL response timeout
2443 -4 internal error; channel still usable
2444 -5 transmit failed
2445 */
2446
2447 int
2448 smtp_write_mail_and_rcpt_cmds(smtp_context * sx, int * yield)
2449 {
2450 address_item * addr;
2451 int address_count;
2452 int rc;
2453
2454 if (build_mailcmd_options(sx, sx->first_addr) != OK)
2455 {
2456 *yield = ERROR;
2457 return -4;
2458 }
2459
2460 /* From here until we send the DATA command, we can make use of PIPELINING
2461 if the server host supports it. The code has to be able to check the responses
2462 at any point, for when the buffer fills up, so we write it totally generally.
2463 When PIPELINING is off, each command written reports that it has flushed the
2464 buffer. */
2465
2466 sx->pending_MAIL = TRUE; /* The block starts with MAIL */
2467
2468 {
2469 uschar * s = sx->from_addr;
2470 #ifdef SUPPORT_I18N
2471 uschar * errstr = NULL;
2472
2473 /* If we must downconvert, do the from-address here. Remember we had to
2474 for the to-addresses (done below), and also (ugly) for re-doing when building
2475 the delivery log line. */
2476
2477 if ( sx->addrlist->prop.utf8_msg
2478 && (sx->addrlist->prop.utf8_downcvt || !(sx->peer_offered & OPTION_UTF8))
2479 )
2480 {
2481 if (s = string_address_utf8_to_alabel(s, &errstr), errstr)
2482 {
2483 set_errno_nohost(sx->addrlist, ERRNO_EXPANDFAIL, errstr, DEFER, FALSE);
2484 *yield = ERROR;
2485 return -4;
2486 }
2487 setflag(sx->addrlist, af_utf8_downcvt);
2488 }
2489 #endif
2490
2491 rc = smtp_write_command(&sx->outblock, pipelining_active ? SCMD_BUFFER : SCMD_FLUSH,
2492 "MAIL FROM:<%s>%s\r\n", s, sx->buffer);
2493 }
2494
2495 mail_command = string_copy(big_buffer); /* Save for later error message */
2496
2497 switch(rc)
2498 {
2499 case -1: /* Transmission error */
2500 return -5;
2501
2502 case +1: /* Cmd was sent */
2503 if (!smtp_read_response(&sx->inblock, sx->buffer, sizeof(sx->buffer), '2',
2504 sx->ob->command_timeout))
2505 {
2506 if (errno == 0 && sx->buffer[0] == '4')
2507 {
2508 errno = ERRNO_MAIL4XX;
2509 sx->addrlist->more_errno |= ((sx->buffer[1] - '0')*10 + sx->buffer[2] - '0') << 8;
2510 }
2511 return -1;
2512 }
2513 sx->pending_MAIL = FALSE;
2514 break;
2515
2516 /* otherwise zero: command queued for pipeline */
2517 }
2518
2519 /* Pass over all the relevant recipient addresses for this host, which are the
2520 ones that have status PENDING_DEFER. If we are using PIPELINING, we can send
2521 several before we have to read the responses for those seen so far. This
2522 checking is done by a subroutine because it also needs to be done at the end.
2523 Send only up to max_rcpt addresses at a time, leaving next_addr pointing to
2524 the next one if not all are sent.
2525
2526 In the MUA wrapper situation, we want to flush the PIPELINING buffer for the
2527 last address because we want to abort if any recipients have any kind of
2528 problem, temporary or permanent. We know that all recipient addresses will have
2529 the PENDING_DEFER status, because only one attempt is ever made, and we know
2530 that max_rcpt will be large, so all addresses will be done at once.
2531
2532 For verify we flush the pipeline after any (the only) rcpt address. */
2533
2534 for (addr = sx->first_addr, address_count = 0;
2535 addr && address_count < sx->max_rcpt;
2536 addr = addr->next) if (addr->transport_return == PENDING_DEFER)
2537 {
2538 int count;
2539 BOOL no_flush;
2540 uschar * rcpt_addr;
2541
2542 if (tcp_out_fastopen && !tcp_out_fastopen_logged)
2543 {
2544 setflag(addr, af_tcp_fastopen_conn);
2545 if (tcp_out_fastopen > 1) setflag(addr, af_tcp_fastopen);
2546 }
2547
2548 addr->dsn_aware = sx->peer_offered & OPTION_DSN
2549 ? dsn_support_yes : dsn_support_no;
2550
2551 address_count++;
2552 no_flush = pipelining_active && !sx->verify
2553 && (!mua_wrapper || addr->next && address_count < sx->max_rcpt);
2554
2555 build_rcptcmd_options(sx, addr);
2556
2557 /* Now send the RCPT command, and process outstanding responses when
2558 necessary. After a timeout on RCPT, we just end the function, leaving the
2559 yield as OK, because this error can often mean that there is a problem with
2560 just one address, so we don't want to delay the host. */
2561
2562 rcpt_addr = transport_rcpt_address(addr, sx->tblock->rcpt_include_affixes);
2563
2564 #ifdef SUPPORT_I18N
2565 if ( testflag(sx->addrlist, af_utf8_downcvt)
2566 && !(rcpt_addr = string_address_utf8_to_alabel(rcpt_addr, NULL))
2567 )
2568 {
2569 /*XXX could we use a per-address errstr here? Not fail the whole send? */
2570 errno = ERRNO_EXPANDFAIL;
2571 return -5; /*XXX too harsh? */
2572 }
2573 #endif
2574
2575 count = smtp_write_command(&sx->outblock, no_flush ? SCMD_BUFFER : SCMD_FLUSH,
2576 "RCPT TO:<%s>%s%s\r\n", rcpt_addr, sx->igquotstr, sx->buffer);
2577
2578 if (count < 0) return -5;
2579 if (count > 0)
2580 {
2581 switch(sync_responses(sx, count, 0))
2582 {
2583 case 3: sx->ok = TRUE; /* 2xx & 5xx => OK & progress made */
2584 case 2: sx->completed_addr = TRUE; /* 5xx (only) => progress made */
2585 break;
2586
2587 case 1: sx->ok = TRUE; /* 2xx (only) => OK, but if LMTP, */
2588 if (!sx->lmtp) /* can't tell about progress yet */
2589 sx->completed_addr = TRUE;
2590 case 0: /* No 2xx or 5xx, but no probs */
2591 break;
2592
2593 case -1: return -3; /* Timeout on RCPT */
2594 case -2: return -2; /* non-MAIL read i/o error */
2595 default: return -1; /* any MAIL error */
2596 }
2597 sx->pending_MAIL = FALSE; /* Dealt with MAIL */
2598 }
2599 } /* Loop for next address */
2600
2601 tcp_out_fastopen_logged = TRUE;
2602 sx->next_addr = addr;
2603 return 0;
2604 }
2605
2606
2607 #ifdef SUPPORT_TLS
2608 /*****************************************************
2609 * Proxy TLS connection for another transport process *
2610 ******************************************************/
2611 /*
2612 Close the unused end of the pipe, fork once more, then use the given buffer
2613 as a staging area, and select on both the given fd and the TLS'd client-fd for
2614 data to read (per the coding in ip_recv() and fd_ready() this is legitimate).
2615 Do blocking full-size writes, and reads under a timeout. Once both input
2616 channels are closed, exit the process.
2617
2618 Arguments:
2619 buf space to use for buffering
2620 bufsiz size of buffer
2621 pfd pipe filedescriptor array; [0] is comms to proxied process
2622 timeout per-read timeout, seconds
2623 */
2624
2625 void
2626 smtp_proxy_tls(uschar * buf, size_t bsize, int * pfd, int timeout)
2627 {
2628 fd_set rfds, efds;
2629 int max_fd = MAX(pfd[0], tls_out.active) + 1;
2630 int rc, i, fd_bits, nbytes;
2631
2632 close(pfd[1]);
2633 if ((rc = fork()))
2634 {
2635 DEBUG(D_transport) debug_printf("proxy-proc final-pid %d\n", rc);
2636 _exit(rc < 0 ? EXIT_FAILURE : EXIT_SUCCESS);
2637 }
2638
2639 if (running_in_test_harness) millisleep(100); /* let parent debug out */
2640 set_process_info("proxying TLS connection for continued transport");
2641 FD_ZERO(&rfds);
2642 FD_SET(tls_out.active, &rfds);
2643 FD_SET(pfd[0], &rfds);
2644
2645 for (fd_bits = 3; fd_bits; )
2646 {
2647 time_t time_left = timeout;
2648 time_t time_start = time(NULL);
2649
2650 /* wait for data */
2651 efds = rfds;
2652 do
2653 {
2654 struct timeval tv = { time_left, 0 };
2655
2656 rc = select(max_fd,
2657 (SELECT_ARG2_TYPE *)&rfds, NULL, (SELECT_ARG2_TYPE *)&efds, &tv);
2658
2659 if (rc < 0 && errno == EINTR)
2660 if ((time_left -= time(NULL) - time_start) > 0) continue;
2661
2662 if (rc <= 0)
2663 {
2664 DEBUG(D_transport) if (rc == 0) debug_printf("%s: timed out\n", __FUNCTION__);
2665 goto done;
2666 }
2667
2668 if (FD_ISSET(tls_out.active, &efds) || FD_ISSET(pfd[0], &efds))
2669 {
2670 DEBUG(D_transport) debug_printf("select: exceptional cond on %s fd\n",
2671 FD_ISSET(pfd[0], &efds) ? "proxy" : "tls");
2672 goto done;
2673 }
2674 }
2675 while (rc < 0 || !(FD_ISSET(tls_out.active, &rfds) || FD_ISSET(pfd[0], &rfds)));
2676
2677 /* handle inbound data */
2678 if (FD_ISSET(tls_out.active, &rfds))
2679 if ((rc = tls_read(FALSE, buf, bsize)) <= 0)
2680 {
2681 fd_bits &= ~1;
2682 FD_CLR(tls_out.active, &rfds);
2683 shutdown(pfd[0], SHUT_WR);
2684 timeout = 5;
2685 }
2686 else
2687 {
2688 for (nbytes = 0; rc - nbytes > 0; nbytes += i)
2689 if ((i = write(pfd[0], buf + nbytes, rc - nbytes)) < 0) goto done;
2690 }
2691 else if (fd_bits & 1)
2692 FD_SET(tls_out.active, &rfds);
2693
2694 /* handle outbound data */
2695 if (FD_ISSET(pfd[0], &rfds))
2696 if ((rc = read(pfd[0], buf, bsize)) <= 0)
2697 {
2698 fd_bits = 0;
2699 tls_close(FALSE, TLS_SHUTDOWN_NOWAIT);
2700 }
2701 else
2702 {
2703 for (nbytes = 0; rc - nbytes > 0; nbytes += i)
2704 if ((i = tls_write(FALSE, buf + nbytes, rc - nbytes, FALSE)) < 0)
2705 goto done;
2706 }
2707 else if (fd_bits & 2)
2708 FD_SET(pfd[0], &rfds);
2709 }
2710
2711 done:
2712 if (running_in_test_harness) millisleep(100); /* let logging complete */
2713 exim_exit(0, US"TLS proxy");
2714 }
2715 #endif
2716
2717
2718 /*************************************************
2719 * Deliver address list to given host *
2720 *************************************************/
2721
2722 /* If continue_hostname is not null, we get here only when continuing to
2723 deliver down an existing channel. The channel was passed as the standard
2724 input. TLS is never active on a passed channel; the previous process always
2725 closes it down before passing the connection on.
2726
2727 Otherwise, we have to make a connection to the remote host, and do the
2728 initial protocol exchange.
2729
2730 When running as an MUA wrapper, if the sender or any recipient is rejected,
2731 temporarily or permanently, we force failure for all recipients.
2732
2733 Arguments:
2734 addrlist chain of potential addresses to deliver; only those whose
2735 transport_return field is set to PENDING_DEFER are currently
2736 being processed; others should be skipped - they have either
2737 been delivered to an earlier host or IP address, or been
2738 failed by one of them.
2739 host host to deliver to
2740 host_af AF_INET or AF_INET6
2741 defport default TCP/IP port to use if host does not specify, in host
2742 byte order
2743 interface interface to bind to, or NULL
2744 tblock transport instance block
2745 message_defer set TRUE if yield is OK, but all addresses were deferred
2746 because of a non-recipient, non-host failure, that is, a
2747 4xx response to MAIL FROM, DATA, or ".". This is a defer
2748 that is specific to the message.
2749 suppress_tls if TRUE, don't attempt a TLS connection - this is set for
2750 a second attempt after TLS initialization fails
2751
2752 Returns: OK - the connection was made and the delivery attempted;
2753 the result for each address is in its data block.
2754 DEFER - the connection could not be made, or something failed
2755 while setting up the SMTP session, or there was a
2756 non-message-specific error, such as a timeout.
2757 ERROR - a filter command is specified for this transport,
2758 and there was a problem setting it up; OR helo_data
2759 or add_headers or authenticated_sender is specified
2760 for this transport, and the string failed to expand
2761 */
2762
2763 static int
2764 smtp_deliver(address_item *addrlist, host_item *host, int host_af, int defport,
2765 uschar *interface, transport_instance *tblock,
2766 BOOL *message_defer, BOOL suppress_tls)
2767 {
2768 address_item *addr;
2769 int yield = OK;
2770 int save_errno;
2771 int rc;
2772 struct timeval start_delivery_time;
2773
2774 BOOL pass_message = FALSE;
2775 uschar *message = NULL;
2776 uschar new_message_id[MESSAGE_ID_LENGTH + 1];
2777
2778 smtp_context sx;
2779
2780 gettimeofday(&start_delivery_time, NULL);
2781 suppress_tls = suppress_tls; /* stop compiler warning when no TLS support */
2782 *message_defer = FALSE;
2783
2784 sx.addrlist = addrlist;
2785 sx.host = host;
2786 sx.host_af = host_af,
2787 sx.port = defport;
2788 sx.interface = interface;
2789 sx.helo_data = NULL;
2790 sx.tblock = tblock;
2791 sx.verify = FALSE;
2792
2793 /* Get the channel set up ready for a message (MAIL FROM being the next
2794 SMTP command to send */
2795
2796 if ((rc = smtp_setup_conn(&sx, suppress_tls)) != OK)
2797 return rc;
2798
2799 /* If there is a filter command specified for this transport, we can now
2800 set it up. This cannot be done until the identify of the host is known. */
2801
2802 if (tblock->filter_command)
2803 {
2804 transport_filter_timeout = tblock->filter_timeout;
2805
2806 /* On failure, copy the error to all addresses, abandon the SMTP call, and
2807 yield ERROR. */
2808
2809 if (!transport_set_up_command(&transport_filter_argv,
2810 tblock->filter_command, TRUE, DEFER, addrlist,
2811 string_sprintf("%.50s transport", tblock->name), NULL))
2812 {
2813 set_errno_nohost(addrlist->next, addrlist->basic_errno, addrlist->message, DEFER,
2814 FALSE);
2815 yield = ERROR;
2816 goto SEND_QUIT;
2817 }
2818
2819 if ( transport_filter_argv
2820 && *transport_filter_argv
2821 && **transport_filter_argv
2822 && sx.peer_offered & OPTION_CHUNKING
2823 )
2824 {
2825 sx.peer_offered &= ~OPTION_CHUNKING;
2826 DEBUG(D_transport) debug_printf("CHUNKING not usable due to transport filter\n");
2827 }
2828 }
2829
2830 sx.first_addr = addrlist;
2831
2832 /* For messages that have more than the maximum number of envelope recipients,
2833 we want to send several transactions down the same SMTP connection. (See
2834 comments in deliver.c as to how this reconciles, heuristically, with
2835 remote_max_parallel.) This optimization was added to Exim after the following
2836 code was already working. The simplest way to put it in without disturbing the
2837 code was to use a goto to jump back to this point when there is another
2838 transaction to handle. */
2839
2840 SEND_MESSAGE:
2841 sx.from_addr = return_path;
2842 sx.sync_addr = sx.first_addr;
2843 sx.ok = FALSE;
2844 sx.send_rset = TRUE;
2845 sx.completed_addr = FALSE;
2846
2847
2848 /* If we are a continued-connection-after-verify the MAIL and RCPT
2849 commands were already sent; do not re-send but do mark the addrs as
2850 having been accepted up to RCPT stage. A traditional cont-conn
2851 always has a sequence number greater than one. */
2852
2853 if (continue_hostname && continue_sequence == 1)
2854 {
2855 address_item * addr;
2856
2857 sx.peer_offered = smtp_peer_options;
2858 sx.pending_MAIL = FALSE;
2859 sx.ok = TRUE;
2860 sx.next_addr = NULL;
2861
2862 for (addr = addrlist; addr; addr = addr->next)
2863 addr->transport_return = PENDING_OK;
2864 }
2865 else
2866 {
2867 /* Initiate a message transfer. */
2868
2869 switch(smtp_write_mail_and_rcpt_cmds(&sx, &yield))
2870 {
2871 case 0: break;
2872 case -1: case -2: goto RESPONSE_FAILED;
2873 case -3: goto END_OFF;
2874 case -4: goto SEND_QUIT;
2875 default: goto SEND_FAILED;
2876 }
2877
2878 /* If we are an MUA wrapper, abort if any RCPTs were rejected, either
2879 permanently or temporarily. We should have flushed and synced after the last
2880 RCPT. */
2881
2882 if (mua_wrapper)
2883 {
2884 address_item * a;
2885 unsigned cnt;
2886
2887 for (a = sx.first_addr, cnt = 0; a && cnt < sx.max_rcpt; a = a->next, cnt++)
2888 if (a->transport_return != PENDING_OK)
2889 {
2890 /*XXX could we find a better errno than 0 here? */
2891 set_errno_nohost(addrlist, 0, a->message, FAIL,
2892 testflag(a, af_pass_message));
2893 sx.ok = FALSE;
2894 break;
2895 }
2896 }
2897 }
2898
2899 /* If ok is TRUE, we know we have got at least one good recipient, and must now
2900 send DATA, but if it is FALSE (in the normal, non-wrapper case), we may still
2901 have a good recipient buffered up if we are pipelining. We don't want to waste
2902 time sending DATA needlessly, so we only send it if either ok is TRUE or if we
2903 are pipelining. The responses are all handled by sync_responses().
2904 If using CHUNKING, do not send a BDAT until we know how big a chunk we want
2905 to send is. */
2906
2907 if ( !(sx.peer_offered & OPTION_CHUNKING)
2908 && (sx.ok || (pipelining_active && !mua_wrapper)))
2909 {
2910 int count = smtp_write_command(&sx.outblock, SCMD_FLUSH, "DATA\r\n");
2911
2912 if (count < 0) goto SEND_FAILED;
2913 switch(sync_responses(&sx, count, sx.ok ? +1 : -1))
2914 {
2915 case 3: sx.ok = TRUE; /* 2xx & 5xx => OK & progress made */
2916 case 2: sx.completed_addr = TRUE; /* 5xx (only) => progress made */
2917 break;
2918
2919 case 1: sx.ok = TRUE; /* 2xx (only) => OK, but if LMTP, */
2920 if (!sx.lmtp) sx.completed_addr = TRUE; /* can't tell about progress yet */
2921 case 0: break; /* No 2xx or 5xx, but no probs */
2922
2923 case -1: goto END_OFF; /* Timeout on RCPT */
2924 default: goto RESPONSE_FAILED; /* I/O error, or any MAIL/DATA error */
2925 }
2926 pipelining_active = FALSE;
2927 data_command = string_copy(big_buffer); /* Save for later error message */
2928 }
2929
2930 /* If there were no good recipients (but otherwise there have been no
2931 problems), just set ok TRUE, since we have handled address-specific errors
2932 already. Otherwise, it's OK to send the message. Use the check/escape mechanism
2933 for handling the SMTP dot-handling protocol, flagging to apply to headers as
2934 well as body. Set the appropriate timeout value to be used for each chunk.
2935 (Haven't been able to make it work using select() for writing yet.) */
2936
2937 if (!(sx.peer_offered & OPTION_CHUNKING) && !sx.ok)
2938 {
2939 /* Save the first address of the next batch. */
2940 sx.first_addr = sx.next_addr;
2941
2942 sx.ok = TRUE;
2943 }
2944 else
2945 {
2946 transport_ctx tctx = {
2947 {sx.inblock.sock},
2948 tblock,
2949 addrlist,
2950 US".", US"..", /* Escaping strings */
2951 topt_use_crlf | topt_escape_headers
2952 | (tblock->body_only ? topt_no_headers : 0)
2953 | (tblock->headers_only ? topt_no_body : 0)
2954 | (tblock->return_path_add ? topt_add_return_path : 0)
2955 | (tblock->delivery_date_add ? topt_add_delivery_date : 0)
2956 | (tblock->envelope_to_add ? topt_add_envelope_to : 0)
2957 };
2958
2959 /* If using CHUNKING we need a callback from the generic transport
2960 support to us, for the sending of BDAT smtp commands and the reaping
2961 of responses. The callback needs a whole bunch of state so set up
2962 a transport-context structure to be passed around. */
2963
2964 if (sx.peer_offered & OPTION_CHUNKING)
2965 {
2966 tctx.check_string = tctx.escape_string = NULL;
2967 tctx.options |= topt_use_bdat;
2968 tctx.chunk_cb = smtp_chunk_cmd_callback;
2969 sx.pending_BDAT = FALSE;
2970 sx.good_RCPT = sx.ok;
2971 sx.cmd_count = 0;
2972 tctx.smtp_context = &sx;
2973 }
2974 else
2975 tctx.options |= topt_end_dot;
2976
2977 /* Save the first address of the next batch. */
2978 sx.first_addr = sx.next_addr;
2979
2980 /* Responses from CHUNKING commands go in buffer. Otherwise,
2981 there has not been a response. */
2982
2983 sx.buffer[0] = 0;
2984
2985 sigalrm_seen = FALSE;
2986 transport_write_timeout = sx.ob->data_timeout;
2987 smtp_command = US"sending data block"; /* For error messages */
2988 DEBUG(D_transport|D_v)
2989 if (sx.peer_offered & OPTION_CHUNKING)
2990 debug_printf(" will write message using CHUNKING\n");
2991 else
2992 debug_printf(" SMTP>> writing message and terminating \".\"\n");
2993 transport_count = 0;
2994
2995 #ifndef DISABLE_DKIM
2996 dkim_exim_sign_init();
2997 # ifdef EXPERIMENTAL_ARC
2998 {
2999 uschar * s = sx.ob->arc_sign;
3000 if (s)
3001 {
3002 if (!(sx.ob->dkim.arc_signspec = s = expand_string(s)))
3003 {
3004 if (!expand_string_forcedfail)
3005 {
3006 message = US"failed to expand arc_sign";
3007 sx.ok = FALSE;
3008 goto SEND_FAILED;
3009 }
3010 }
3011 else if (*s)
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 }
3019 # endif
3020 sx.ok = dkim_transport_write_message(&tctx, &sx.ob->dkim, CUSS &message);
3021 #else
3022 sx.ok = transport_write_message(&tctx, 0);
3023 #endif
3024
3025 /* transport_write_message() uses write() because it is called from other
3026 places to write to non-sockets. This means that under some OS (e.g. Solaris)
3027 it can exit with "Broken pipe" as its error. This really means that the
3028 socket got closed at the far end. */
3029
3030 transport_write_timeout = 0; /* for subsequent transports */
3031
3032 /* Failure can either be some kind of I/O disaster (including timeout),
3033 or the failure of a transport filter or the expansion of added headers.
3034 Or, when CHUNKING, it can be a protocol-detected failure. */
3035
3036 if (!sx.ok)
3037 if (message) goto SEND_FAILED;
3038 else goto RESPONSE_FAILED;
3039
3040 /* We used to send the terminating "." explicitly here, but because of
3041 buffering effects at both ends of TCP/IP connections, you don't gain
3042 anything by keeping it separate, so it might as well go in the final
3043 data buffer for efficiency. This is now done by setting the topt_end_dot
3044 flag above. */
3045
3046 smtp_command = US"end of data";
3047
3048 if (sx.peer_offered & OPTION_CHUNKING && sx.cmd_count > 1)
3049 {
3050 /* Reap any outstanding MAIL & RCPT commands, but not a DATA-go-ahead */
3051 switch(sync_responses(&sx, sx.cmd_count-1, 0))
3052 {
3053 case 3: sx.ok = TRUE; /* 2xx & 5xx => OK & progress made */
3054 case 2: sx.completed_addr = TRUE; /* 5xx (only) => progress made */
3055 break;
3056
3057 case 1: sx.ok = TRUE; /* 2xx (only) => OK, but if LMTP, */
3058 if (!sx.lmtp) sx.completed_addr = TRUE; /* can't tell about progress yet */
3059 case 0: break; /* No 2xx or 5xx, but no probs */
3060
3061 case -1: goto END_OFF; /* Timeout on RCPT */
3062 default: goto RESPONSE_FAILED; /* I/O error, or any MAIL/DATA error */
3063 }
3064 }
3065
3066 #ifndef DISABLE_PRDR
3067 /* For PRDR we optionally get a partial-responses warning
3068 * followed by the individual responses, before going on with
3069 * the overall response. If we don't get the warning then deal
3070 * with per non-PRDR. */
3071 if(sx.prdr_active)
3072 {
3073 sx.ok = smtp_read_response(&sx.inblock, sx.buffer, sizeof(sx.buffer), '3',
3074 sx.ob->final_timeout);
3075 if (!sx.ok && errno == 0) switch(sx.buffer[0])
3076 {
3077 case '2': sx.prdr_active = FALSE;
3078 sx.ok = TRUE;
3079 break;
3080 case '4': errno = ERRNO_DATA4XX;
3081 addrlist->more_errno |=
3082 ((sx.buffer[1] - '0')*10 + sx.buffer[2] - '0') << 8;
3083 break;
3084 }
3085 }
3086 else
3087 #endif
3088
3089 /* For non-PRDR SMTP, we now read a single response that applies to the
3090 whole message. If it is OK, then all the addresses have been delivered. */
3091
3092 if (!sx.lmtp)
3093 {
3094 sx.ok = smtp_read_response(&sx.inblock, sx.buffer, sizeof(sx.buffer), '2',
3095 sx.ob->final_timeout);
3096 if (!sx.ok && errno == 0 && sx.buffer[0] == '4')
3097 {
3098 errno = ERRNO_DATA4XX;
3099 addrlist->more_errno |= ((sx.buffer[1] - '0')*10 + sx.buffer[2] - '0') << 8;
3100 }
3101 }
3102
3103 /* For LMTP, we get back a response for every RCPT command that we sent;
3104 some may be accepted and some rejected. For those that get a response, their
3105 status is fixed; any that are accepted have been handed over, even if later
3106 responses crash - at least, that's how I read RFC 2033.
3107
3108 If all went well, mark the recipient addresses as completed, record which
3109 host/IPaddress they were delivered to, and cut out RSET when sending another
3110 message down the same channel. Write the completed addresses to the journal
3111 now so that they are recorded in case there is a crash of hardware or
3112 software before the spool gets updated. Also record the final SMTP
3113 confirmation if needed (for SMTP only). */
3114
3115 if (sx.ok)
3116 {
3117 int flag = '=';
3118 struct timeval delivery_time;
3119 int len;
3120 uschar * conf = NULL;
3121
3122 timesince(&delivery_time, &start_delivery_time);
3123 sx.send_rset = FALSE;
3124 pipelining_active = FALSE;
3125
3126 /* Set up confirmation if needed - applies only to SMTP */
3127
3128 if (
3129 #ifdef DISABLE_EVENT
3130 LOGGING(smtp_confirmation) &&
3131 #endif
3132 !sx.lmtp
3133 )
3134 {
3135 const uschar *s = string_printing(sx.buffer);
3136 /* deconst cast ok here as string_printing was checked to have alloc'n'copied */
3137 conf = (s == sx.buffer)? US string_copy(s) : US s;
3138 }
3139
3140 /* Process all transported addresses - for LMTP or PRDR, read a status for
3141 each one. */
3142
3143 for (addr = addrlist; addr != sx.first_addr; addr = addr->next)
3144 {
3145 if (addr->transport_return != PENDING_OK) continue;
3146
3147 /* LMTP - if the response fails badly (e.g. timeout), use it for all the
3148 remaining addresses. Otherwise, it's a return code for just the one
3149 address. For temporary errors, add a retry item for the address so that
3150 it doesn't get tried again too soon. */
3151
3152 #ifndef DISABLE_PRDR
3153 if (sx.lmtp || sx.prdr_active)
3154 #else
3155 if (sx.lmtp)
3156 #endif
3157 {
3158 if (!smtp_read_response(&sx.inblock, sx.buffer, sizeof(sx.buffer), '2',
3159 sx.ob->final_timeout))
3160 {
3161 if (errno != 0 || sx.buffer[0] == 0) goto RESPONSE_FAILED;
3162 addr->message = string_sprintf(
3163 #ifndef DISABLE_PRDR
3164 "%s error after %s: %s", sx.prdr_active ? "PRDR":"LMTP",
3165 #else
3166 "LMTP error after %s: %s",
3167 #endif
3168 data_command, string_printing(sx.buffer));
3169 setflag(addr, af_pass_message); /* Allow message to go to user */
3170 if (sx.buffer[0] == '5')
3171 addr->transport_return = FAIL;
3172 else
3173 {
3174 errno = ERRNO_DATA4XX;
3175 addr->more_errno |= ((sx.buffer[1] - '0')*10 + sx.buffer[2] - '0') << 8;
3176 addr->transport_return = DEFER;
3177 #ifndef DISABLE_PRDR
3178 if (!sx.prdr_active)
3179 #endif
3180 retry_add_item(addr, addr->address_retry_key, 0);
3181 }
3182 continue;
3183 }
3184 sx.completed_addr = TRUE; /* NOW we can set this flag */
3185 if (LOGGING(smtp_confirmation))
3186 {
3187 const uschar *s = string_printing(sx.buffer);
3188 /* deconst cast ok here as string_printing was checked to have alloc'n'copied */
3189 conf = (s == sx.buffer) ? US string_copy(s) : US s;
3190 }
3191 }
3192
3193 /* SMTP, or success return from LMTP for this address. Pass back the
3194 actual host that was used. */
3195
3196 addr->transport_return = OK;
3197 addr->more_errno = delivery_time.tv_sec;
3198 addr->delivery_usec = delivery_time.tv_usec;
3199 addr->host_used = host;
3200 addr->special_action = flag;
3201 addr->message = conf;
3202 #ifndef DISABLE_PRDR
3203 if (sx.prdr_active) setflag(addr, af_prdr_used);
3204 #endif
3205 if (sx.peer_offered & OPTION_CHUNKING) setflag(addr, af_chunking_used);
3206 flag = '-';
3207
3208 #ifndef DISABLE_PRDR
3209 if (!sx.prdr_active)
3210 #endif
3211 {
3212 /* Update the journal. For homonymic addresses, use the base address plus
3213 the transport name. See lots of comments in deliver.c about the reasons
3214 for the complications when homonyms are involved. Just carry on after
3215 write error, as it may prove possible to update the spool file later. */
3216
3217 if (testflag(addr, af_homonym))
3218 sprintf(CS sx.buffer, "%.500s/%s\n", addr->unique + 3, tblock->name);
3219 else
3220 sprintf(CS sx.buffer, "%.500s\n", addr->unique);
3221
3222 DEBUG(D_deliver) debug_printf("S:journalling %s\n", sx.buffer);
3223 len = Ustrlen(CS sx.buffer);
3224 if (write(journal_fd, sx.buffer, len) != len)
3225 log_write(0, LOG_MAIN|LOG_PANIC, "failed to write journal for "
3226 "%s: %s", sx.buffer, strerror(errno));
3227 }
3228 }
3229
3230 #ifndef DISABLE_PRDR
3231 if (sx.prdr_active)
3232 {
3233 const uschar * overall_message;
3234
3235 /* PRDR - get the final, overall response. For any non-success
3236 upgrade all the address statuses. */
3237
3238 sx.ok = smtp_read_response(&sx.inblock, sx.buffer, sizeof(sx.buffer), '2',
3239 sx.ob->final_timeout);
3240 if (!sx.ok)
3241 {
3242 if(errno == 0 && sx.buffer[0] == '4')
3243 {
3244 errno = ERRNO_DATA4XX;
3245 addrlist->more_errno |= ((sx.buffer[1] - '0')*10 + sx.buffer[2] - '0') << 8;
3246 }
3247 for (addr = addrlist; addr != sx.first_addr; addr = addr->next)
3248 if (sx.buffer[0] == '5' || addr->transport_return == OK)
3249 addr->transport_return = PENDING_OK; /* allow set_errno action */
3250 goto RESPONSE_FAILED;
3251 }
3252
3253 /* Append the overall response to the individual PRDR response for logging
3254 and update the journal, or setup retry. */
3255
3256 overall_message = string_printing(sx.buffer);
3257 for (addr = addrlist; addr != sx.first_addr; addr = addr->next)
3258 if (addr->transport_return == OK)
3259 addr->message = string_sprintf("%s\\n%s", addr->message, overall_message);
3260
3261 for (addr = addrlist; addr != sx.first_addr; addr = addr->next)
3262 if (addr->transport_return == OK)
3263 {
3264 if (testflag(addr, af_homonym))
3265 sprintf(CS sx.buffer, "%.500s/%s\n", addr->unique + 3, tblock->name);
3266 else
3267 sprintf(CS sx.buffer, "%.500s\n", addr->unique);
3268
3269 DEBUG(D_deliver) debug_printf("journalling(PRDR) %s\n", sx.buffer);
3270 len = Ustrlen(CS sx.buffer);
3271 if (write(journal_fd, sx.buffer, len) != len)
3272 log_write(0, LOG_MAIN|LOG_PANIC, "failed to write journal for "
3273 "%s: %s", sx.buffer, strerror(errno));
3274 }
3275 else if (addr->transport_return == DEFER)
3276 retry_add_item(addr, addr->address_retry_key, -2);
3277 }
3278 #endif
3279
3280 /* Ensure the journal file is pushed out to disk. */
3281
3282 if (EXIMfsync(journal_fd) < 0)
3283 log_write(0, LOG_MAIN|LOG_PANIC, "failed to fsync journal: %s",
3284 strerror(errno));
3285 }
3286 }
3287
3288
3289 /* Handle general (not specific to one address) failures here. The value of ok
3290 is used to skip over this code on the falling through case. A timeout causes a
3291 deferral. Other errors may defer or fail according to the response code, and
3292 may set up a special errno value, e.g. after connection chopped, which is
3293 assumed if errno == 0 and there is no text in the buffer. If control reaches
3294 here during the setting up phase (i.e. before MAIL FROM) then always defer, as
3295 the problem is not related to this specific message. */
3296
3297 if (!sx.ok)
3298 {
3299 int code, set_rc;
3300 uschar * set_message;
3301
3302 RESPONSE_FAILED:
3303 {
3304 save_errno = errno;
3305 message = NULL;
3306 sx.send_quit = check_response(host, &save_errno, addrlist->more_errno,
3307 sx.buffer, &code, &message, &pass_message);
3308 goto FAILED;
3309 }
3310
3311 SEND_FAILED:
3312 {
3313 save_errno = errno;
3314 code = '4';
3315 message = string_sprintf("send() to %s [%s] failed: %s",
3316 host->name, host->address, message ? message : US strerror(save_errno));
3317 sx.send_quit = FALSE;
3318 goto FAILED;
3319 }
3320
3321 FAILED:
3322 {
3323 BOOL message_error;
3324
3325 sx.ok = FALSE; /* For when reached by GOTO */
3326 set_message = message;
3327
3328 /* We want to handle timeouts after MAIL or "." and loss of connection after
3329 "." specially. They can indicate a problem with the sender address or with
3330 the contents of the message rather than a real error on the connection. These
3331 cases are treated in the same way as a 4xx response. This next bit of code
3332 does the classification. */
3333
3334 switch(save_errno)
3335 {
3336 case 0:
3337 case ERRNO_MAIL4XX:
3338 case ERRNO_DATA4XX:
3339 message_error = TRUE;
3340 break;
3341
3342 case ETIMEDOUT:
3343 message_error = Ustrncmp(smtp_command,"MAIL",4) == 0 ||
3344 Ustrncmp(smtp_command,"end ",4) == 0;
3345 break;
3346
3347 case ERRNO_SMTPCLOSED:
3348 message_error = Ustrncmp(smtp_command,"end ",4) == 0;
3349 break;
3350
3351 default:
3352 message_error = FALSE;
3353 break;
3354 }
3355
3356 /* Handle the cases that are treated as message errors. These are:
3357
3358 (a) negative response or timeout after MAIL
3359 (b) negative response after DATA
3360 (c) negative response or timeout or dropped connection after "."
3361 (d) utf8 support required and not offered
3362
3363 It won't be a negative response or timeout after RCPT, as that is dealt
3364 with separately above. The action in all cases is to set an appropriate
3365 error code for all the addresses, but to leave yield set to OK because the
3366 host itself has not failed. Of course, it might in practice have failed
3367 when we've had a timeout, but if so, we'll discover that at the next
3368 delivery attempt. For a temporary error, set the message_defer flag, and
3369 write to the logs for information if this is not the last host. The error
3370 for the last host will be logged as part of the address's log line. */
3371
3372 if (message_error)
3373 {
3374 if (mua_wrapper) code = '5'; /* Force hard failure in wrapper mode */
3375
3376 /* If there's an errno, the message contains just the identity of
3377 the host. */
3378
3379 if (code == '5')
3380 set_rc = FAIL;
3381 else /* Anything other than 5 is treated as temporary */
3382 {
3383 set_rc = DEFER;
3384 if (save_errno > 0)
3385 message = US string_sprintf("%s: %s", message, strerror(save_errno));
3386
3387 write_logs(host, message, sx.first_addr ? sx.first_addr->basic_errno : 0);
3388
3389 *message_defer = TRUE;
3390 }
3391 }
3392
3393 /* Otherwise, we have an I/O error or a timeout other than after MAIL or
3394 ".", or some other transportation error. We defer all addresses and yield
3395 DEFER, except for the case of failed add_headers expansion, or a transport
3396 filter failure, when the yield should be ERROR, to stop it trying other
3397 hosts. */
3398
3399 else
3400 {
3401 set_rc = DEFER;
3402 yield = (save_errno == ERRNO_CHHEADER_FAIL ||
3403 save_errno == ERRNO_FILTER_FAIL)? ERROR : DEFER;
3404 }
3405 }
3406
3407 set_errno(addrlist, save_errno, set_message, set_rc, pass_message, host
3408 #ifdef EXPERIMENTAL_DSN_INFO
3409 , sx.smtp_greeting, sx.helo_response
3410 #endif
3411 );
3412 }
3413
3414
3415 /* If all has gone well, send_quit will be set TRUE, implying we can end the
3416 SMTP session tidily. However, if there were too many addresses to send in one
3417 message (indicated by first_addr being non-NULL) we want to carry on with the
3418 rest of them. Also, it is desirable to send more than one message down the SMTP
3419 connection if there are several waiting, provided we haven't already sent so
3420 many as to hit the configured limit. The function transport_check_waiting looks
3421 for a waiting message and returns its id. Then transport_pass_socket tries to
3422 set up a continued delivery by passing the socket on to another process. The
3423 variable send_rset is FALSE if a message has just been successfully transfered.
3424
3425 If we are already sending down a continued channel, there may be further
3426 addresses not yet delivered that are aimed at the same host, but which have not
3427 been passed in this run of the transport. In this case, continue_more will be
3428 true, and all we should do is send RSET if necessary, and return, leaving the
3429 channel open.
3430
3431 However, if no address was disposed of, i.e. all addresses got 4xx errors, we
3432 do not want to continue with other messages down the same channel, because that
3433 can lead to looping between two or more messages, all with the same,
3434 temporarily failing address(es). [The retry information isn't updated yet, so
3435 new processes keep on trying.] We probably also don't want to try more of this
3436 message's addresses either.
3437
3438 If we have started a TLS session, we have to end it before passing the
3439 connection to a new process. However, not all servers can handle this (Exim
3440 can), so we do not pass such a connection on if the host matches
3441 hosts_nopass_tls. */
3442
3443 DEBUG(D_transport)
3444 debug_printf("ok=%d send_quit=%d send_rset=%d continue_more=%d "
3445 "yield=%d first_address is %sNULL\n", sx.ok, sx.send_quit,
3446 sx.send_rset, continue_more, yield, sx.first_addr ? "not " : "");
3447
3448 if (sx.completed_addr && sx.ok && sx.send_quit)
3449 {
3450 BOOL more;
3451 smtp_compare_t t_compare;
3452
3453 t_compare.tblock = tblock;
3454 t_compare.current_sender_address = sender_address;
3455
3456 if ( sx.first_addr != NULL
3457 || continue_more
3458 || (
3459 #ifdef SUPPORT_TLS
3460 ( tls_out.active < 0 && !continue_proxy_cipher
3461 || verify_check_given_host(&sx.ob->hosts_nopass_tls, host) != OK
3462 )
3463 &&
3464 #endif
3465 transport_check_waiting(tblock->name, host->name,
3466 tblock->connection_max_messages, new_message_id, &more,
3467 (oicf)smtp_are_same_identities, (void*)&t_compare)
3468 ) )
3469 {
3470 uschar *msg;
3471 BOOL pass_message;
3472
3473 if (sx.send_rset)
3474 if (! (sx.ok = smtp_write_command(&sx.outblock, SCMD_FLUSH, "RSET\r\n") >= 0))
3475 {
3476 msg = US string_sprintf("send() to %s [%s] failed: %s", host->name,
3477 host->address, strerror(errno));
3478 sx.send_quit = FALSE;
3479 }
3480 else if (! (sx.ok = smtp_read_response(&sx.inblock, sx.buffer,
3481 sizeof(sx.buffer), '2', sx.ob->command_timeout)))
3482 {
3483 int code;
3484 sx.send_quit = check_response(host, &errno, 0, sx.buffer, &code, &msg,
3485 &pass_message);
3486 if (!sx.send_quit)
3487 {
3488 DEBUG(D_transport) debug_printf("H=%s [%s] %s\n",
3489 host->name, host->address, msg);
3490 }
3491 }
3492
3493 /* Either RSET was not needed, or it succeeded */
3494
3495 if (sx.ok)
3496 {
3497 int pfd[2];
3498 int socket_fd = sx.inblock.sock;
3499
3500
3501 if (sx.first_addr != NULL) /* More addresses still to be sent */
3502 { /* in this run of the transport */
3503 continue_sequence++; /* Causes * in logging */
3504 goto SEND_MESSAGE;
3505 }
3506
3507 /* Unless caller said it already has more messages listed for this host,
3508 pass the connection on to a new Exim process (below, the call to
3509 transport_pass_socket). If the caller has more ready, just return with
3510 the connection still open. */
3511
3512 #ifdef SUPPORT_TLS
3513 if (tls_out.active >= 0)
3514 if ( continue_more
3515 || verify_check_given_host(&sx.ob->hosts_noproxy_tls, host) == OK)
3516 {
3517 /* Before passing the socket on, or returning to caller with it still
3518 open, we must shut down TLS. Not all MTAs allow for the continuation
3519 of the SMTP session when TLS is shut down. We test for this by sending
3520 a new EHLO. If we don't get a good response, we don't attempt to pass
3521 the socket on. */
3522
3523 tls_close(FALSE, TLS_SHUTDOWN_WAIT);
3524 smtp_peer_options = smtp_peer_options_wrap;
3525 sx.ok = !sx.smtps
3526 && smtp_write_command(&sx.outblock, SCMD_FLUSH,
3527 "EHLO %s\r\n", sx.helo_data) >= 0
3528 && smtp_read_response(&sx.inblock, sx.buffer, sizeof(sx.buffer),
3529 '2', sx.ob->command_timeout);
3530
3531 if (sx.ok && continue_more)
3532 return yield; /* More addresses for another run */
3533 }
3534 else
3535 {
3536 /* Set up a pipe for proxying TLS for the new transport process */
3537
3538 smtp_peer_options |= OPTION_TLS;
3539 if (sx.ok = (socketpair(AF_UNIX, SOCK_STREAM, 0, pfd) == 0))
3540 socket_fd = pfd[1];
3541 else
3542 set_errno(sx.first_addr, errno, US"internal allocation problem",
3543 DEFER, FALSE, host
3544 # ifdef EXPERIMENTAL_DSN_INFO
3545 , sx.smtp_greeting, sx.helo_response
3546 # endif
3547 );
3548 }
3549 else
3550 #endif
3551 if (continue_more)
3552 return yield; /* More addresses for another run */
3553
3554 /* If the socket is successfully passed, we mustn't send QUIT (or
3555 indeed anything!) from here. */
3556
3557 /*XXX DSN_INFO: assume likely to do new HELO; but for greet we'll want to
3558 propagate it from the initial
3559 */
3560 if (sx.ok && transport_pass_socket(tblock->name, host->name,
3561 host->address, new_message_id, socket_fd))
3562 {
3563 sx.send_quit = FALSE;
3564
3565 /* We have passed the client socket to a fresh transport process.
3566 If TLS is still active, we need to proxy it for the transport we
3567 just passed the baton to. Fork a child to to do it, and return to
3568 get logging done asap. Which way to place the work makes assumptions
3569 about post-fork prioritisation which may not hold on all platforms. */
3570 #ifdef SUPPORT_TLS
3571 if (tls_out.active >= 0)
3572 {
3573 int pid = fork();
3574 if (pid == 0) /* child; fork again to disconnect totally */
3575 {
3576 if (running_in_test_harness) millisleep(100); /* let parent debug out */
3577 /* does not return */
3578 smtp_proxy_tls(sx.buffer, sizeof(sx.buffer), pfd,
3579 sx.ob->command_timeout);
3580 }
3581
3582 if (pid > 0) /* parent */
3583 {
3584 DEBUG(D_transport) debug_printf("proxy-proc inter-pid %d\n", pid);
3585 close(pfd[0]);
3586 /* tidy the inter-proc to disconn the proxy proc */
3587 waitpid(pid, NULL, 0);
3588 tls_close(FALSE, TLS_NO_SHUTDOWN);
3589 (void)close(sx.inblock.sock);
3590 continue_transport = NULL;
3591 continue_hostname = NULL;
3592 return yield;
3593 }
3594 log_write(0, LOG_PANIC_DIE, "fork failed");
3595 }
3596 #endif
3597 }
3598 }
3599
3600 /* If RSET failed and there are addresses left, they get deferred. */
3601 else
3602 set_errno(sx.first_addr, errno, msg, DEFER, FALSE, host
3603 #ifdef EXPERIMENTAL_DSN_INFO
3604 , sx.smtp_greeting, sx.helo_response
3605 #endif
3606 );
3607 }
3608 }
3609
3610 /* End off tidily with QUIT unless the connection has died or the socket has
3611 been passed to another process. There has been discussion on the net about what
3612 to do after sending QUIT. The wording of the RFC suggests that it is necessary
3613 to wait for a response, but on the other hand, there isn't anything one can do
3614 with an error response, other than log it. Exim used to do that. However,
3615 further discussion suggested that it is positively advantageous not to wait for
3616 the response, but to close the session immediately. This is supposed to move
3617 the TCP/IP TIME_WAIT state from the server to the client, thereby removing some
3618 load from the server. (Hosts that are both servers and clients may not see much
3619 difference, of course.) Further discussion indicated that this was safe to do
3620 on Unix systems which have decent implementations of TCP/IP that leave the
3621 connection around for a while (TIME_WAIT) after the application has gone away.
3622 This enables the response sent by the server to be properly ACKed rather than
3623 timed out, as can happen on broken TCP/IP implementations on other OS.
3624
3625 This change is being made on 31-Jul-98. After over a year of trouble-free
3626 operation, the old commented-out code was removed on 17-Sep-99. */
3627
3628 SEND_QUIT:
3629 if (sx.send_quit) (void)smtp_write_command(&sx.outblock, SCMD_FLUSH, "QUIT\r\n");
3630
3631 END_OFF:
3632
3633 #ifdef SUPPORT_TLS
3634 tls_close(FALSE, TLS_SHUTDOWN_NOWAIT);
3635 #endif
3636
3637 /* Close the socket, and return the appropriate value, first setting
3638 works because the NULL setting is passed back to the calling process, and
3639 remote_max_parallel is forced to 1 when delivering over an existing connection,
3640
3641 If all went well and continue_more is set, we shouldn't actually get here if
3642 there are further addresses, as the return above will be taken. However,
3643 writing RSET might have failed, or there may be other addresses whose hosts are
3644 specified in the transports, and therefore not visible at top level, in which
3645 case continue_more won't get set. */
3646
3647 HDEBUG(D_transport|D_acl|D_v) debug_printf_indent(" SMTP(close)>>\n");
3648 if (sx.send_quit)
3649 {
3650 shutdown(sx.outblock.sock, SHUT_WR);
3651 if (fcntl(sx.inblock.sock, F_SETFL, O_NONBLOCK) == 0)
3652 for (rc = 16; read(sx.inblock.sock, sx.inbuffer, sizeof(sx.inbuffer)) > 0 && rc > 0;)
3653 rc--; /* drain socket */
3654 }
3655 (void)close(sx.inblock.sock);
3656
3657 #ifndef DISABLE_EVENT
3658 (void) event_raise(tblock->event_action, US"tcp:close", NULL);
3659 #endif
3660
3661 continue_transport = NULL;
3662 continue_hostname = NULL;
3663 return yield;
3664 }
3665
3666
3667
3668
3669 /*************************************************
3670 * Closedown entry point *
3671 *************************************************/
3672
3673 /* This function is called when exim is passed an open smtp channel
3674 from another incarnation, but the message which it has been asked
3675 to deliver no longer exists. The channel is on stdin.
3676
3677 We might do fancy things like looking for another message to send down
3678 the channel, but if the one we sought has gone, it has probably been
3679 delivered by some other process that itself will seek further messages,
3680 so just close down our connection.
3681
3682 Argument: pointer to the transport instance block
3683 Returns: nothing
3684 */
3685
3686 void
3687 smtp_transport_closedown(transport_instance *tblock)
3688 {
3689 smtp_transport_options_block *ob =
3690 (smtp_transport_options_block *)tblock->options_block;
3691 smtp_inblock inblock;
3692 smtp_outblock outblock;
3693 uschar buffer[256];
3694 uschar inbuffer[4096];
3695 uschar outbuffer[16];
3696
3697 inblock.sock = fileno(stdin);
3698 inblock.buffer = inbuffer;
3699 inblock.buffersize = sizeof(inbuffer);
3700 inblock.ptr = inbuffer;
3701 inblock.ptrend = inbuffer;
3702
3703 outblock.sock = inblock.sock;
3704 outblock.buffersize = sizeof(outbuffer);
3705 outblock.buffer = outbuffer;
3706 outblock.ptr = outbuffer;
3707 outblock.cmd_count = 0;
3708 outblock.authenticating = FALSE;
3709
3710 (void)smtp_write_command(&outblock, SCMD_FLUSH, "QUIT\r\n");
3711 (void)smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
3712 ob->command_timeout);
3713 (void)close(inblock.sock);
3714 }
3715
3716
3717
3718 /*************************************************
3719 * Prepare addresses for delivery *
3720 *************************************************/
3721
3722 /* This function is called to flush out error settings from previous delivery
3723 attempts to other hosts. It also records whether we got here via an MX record
3724 or not in the more_errno field of the address. We are interested only in
3725 addresses that are still marked DEFER - others may have got delivered to a
3726 previously considered IP address. Set their status to PENDING_DEFER to indicate
3727 which ones are relevant this time.
3728
3729 Arguments:
3730 addrlist the list of addresses
3731 host the host we are delivering to
3732
3733 Returns: the first address for this delivery
3734 */
3735
3736 static address_item *
3737 prepare_addresses(address_item *addrlist, host_item *host)
3738 {
3739 address_item *first_addr = NULL;
3740 address_item *addr;
3741 for (addr = addrlist; addr; addr = addr->next)
3742 if (addr->transport_return == DEFER)
3743 {
3744 if (!first_addr) first_addr = addr;
3745 addr->transport_return = PENDING_DEFER;
3746 addr->basic_errno = 0;
3747 addr->more_errno = (host->mx >= 0)? 'M' : 'A';
3748 addr->message = NULL;
3749 #ifdef SUPPORT_TLS
3750 addr->cipher = NULL;
3751 addr->ourcert = NULL;
3752 addr->peercert = NULL;
3753 addr->peerdn = NULL;
3754 addr->ocsp = OCSP_NOT_REQ;
3755 #endif
3756 #ifdef EXPERIMENTAL_DSN_INFO
3757 addr->smtp_greeting = NULL;
3758 addr->helo_response = NULL;
3759 #endif
3760 }
3761 return first_addr;
3762 }
3763
3764
3765
3766 /*************************************************
3767 * Main entry point *
3768 *************************************************/
3769
3770 /* See local README for interface details. As this is a remote transport, it is
3771 given a chain of addresses to be delivered in one connection, if possible. It
3772 always returns TRUE, indicating that each address has its own independent
3773 status set, except if there is a setting up problem, in which case it returns
3774 FALSE. */
3775
3776 BOOL
3777 smtp_transport_entry(
3778 transport_instance *tblock, /* data for this instantiation */
3779 address_item *addrlist) /* addresses we are working on */
3780 {
3781 int cutoff_retry;
3782 int defport;
3783 int hosts_defer = 0;
3784 int hosts_fail = 0;
3785 int hosts_looked_up = 0;
3786 int hosts_retry = 0;
3787 int hosts_serial = 0;
3788 int hosts_total = 0;
3789 int total_hosts_tried = 0;
3790 address_item *addr;
3791 BOOL expired = TRUE;
3792 uschar *expanded_hosts = NULL;
3793 uschar *pistring;
3794 uschar *tid = string_sprintf("%s transport", tblock->name);
3795 smtp_transport_options_block *ob =
3796 (smtp_transport_options_block *)(tblock->options_block);
3797 host_item *hostlist = addrlist->host_list;
3798 host_item *host;
3799
3800 DEBUG(D_transport)
3801 {
3802 debug_printf("%s transport entered\n", tblock->name);
3803 for (addr = addrlist; addr; addr = addr->next)
3804 debug_printf(" %s\n", addr->address);
3805 if (hostlist)
3806 {
3807 debug_printf("hostlist:\n");
3808 for (host = hostlist; host; host = host->next)
3809 debug_printf(" '%s' IP %s port %d\n", host->name, host->address, host->port);
3810 }
3811 if (continue_hostname)
3812 debug_printf("already connected to %s [%s] (on fd %d)\n",
3813 continue_hostname, continue_host_address,
3814 cutthrough.fd >= 0 ? cutthrough.fd : 0);
3815 }
3816
3817 /* Set the flag requesting that these hosts be added to the waiting
3818 database if the delivery fails temporarily or if we are running with
3819 queue_smtp or a 2-stage queue run. This gets unset for certain
3820 kinds of error, typically those that are specific to the message. */
3821
3822 update_waiting = TRUE;
3823
3824 /* If a host list is not defined for the addresses - they must all have the
3825 same one in order to be passed to a single transport - or if the transport has
3826 a host list with hosts_override set, use the host list supplied with the
3827 transport. It is an error for this not to exist. */
3828
3829 if (!hostlist || (ob->hosts_override && ob->hosts))
3830 {
3831 if (!ob->hosts)
3832 {
3833 addrlist->message = string_sprintf("%s transport called with no hosts set",
3834 tblock->name);
3835 addrlist->transport_return = PANIC;
3836 return FALSE; /* Only top address has status */
3837 }
3838
3839 DEBUG(D_transport) debug_printf("using the transport's hosts: %s\n",
3840 ob->hosts);
3841
3842 /* If the transport's host list contains no '$' characters, and we are not
3843 randomizing, it is fixed and therefore a chain of hosts can be built once
3844 and for all, and remembered for subsequent use by other calls to this
3845 transport. If, on the other hand, the host list does contain '$', or we are
3846 randomizing its order, we have to rebuild it each time. In the fixed case,
3847 as the hosts string will never be used again, it doesn't matter that we
3848 replace all the : characters with zeros. */
3849
3850 if (!ob->hostlist)
3851 {
3852 uschar *s = ob->hosts;
3853
3854 if (Ustrchr(s, '$') != NULL)
3855 {
3856 if (!(expanded_hosts = expand_string(s)))
3857 {
3858 addrlist->message = string_sprintf("failed to expand list of hosts "
3859 "\"%s\" in %s transport: %s", s, tblock->name, expand_string_message);
3860 addrlist->transport_return = search_find_defer ? DEFER : PANIC;
3861 return FALSE; /* Only top address has status */
3862 }
3863 DEBUG(D_transport) debug_printf("expanded list of hosts \"%s\" to "
3864 "\"%s\"\n", s, expanded_hosts);
3865 s = expanded_hosts;
3866 }
3867 else
3868 if (ob->hosts_randomize) s = expanded_hosts = string_copy(s);
3869
3870 host_build_hostlist(&hostlist, s, ob->hosts_randomize);
3871
3872 /* Check that the expansion yielded something useful. */
3873 if (!hostlist)
3874 {
3875 addrlist->message =
3876 string_sprintf("%s transport has empty hosts setting", tblock->name);
3877 addrlist->transport_return = PANIC;
3878 return FALSE; /* Only top address has status */
3879 }
3880
3881 /* If there was no expansion of hosts, save the host list for
3882 next time. */
3883
3884 if (!expanded_hosts) ob->hostlist = hostlist;
3885 }
3886
3887 /* This is not the first time this transport has been run in this delivery;
3888 the host list was built previously. */
3889
3890 else
3891 hostlist = ob->hostlist;
3892 }
3893
3894 /* The host list was supplied with the address. If hosts_randomize is set, we
3895 must sort it into a random order if it did not come from MX records and has not
3896 already been randomized (but don't bother if continuing down an existing
3897 connection). */
3898
3899 else if (ob->hosts_randomize && hostlist->mx == MX_NONE && !continue_hostname)
3900 {
3901 host_item *newlist = NULL;
3902 while (hostlist)
3903 {
3904 host_item *h = hostlist;
3905 hostlist = hostlist->next;
3906
3907 h->sort_key = random_number(100);
3908
3909 if (!newlist)
3910 {
3911 h->next = NULL;
3912 newlist = h;
3913 }
3914 else if (h->sort_key < newlist->sort_key)
3915 {
3916 h->next = newlist;
3917 newlist = h;
3918 }
3919 else
3920 {
3921 host_item *hh = newlist;
3922 while (hh->next)
3923 {
3924 if (h->sort_key < hh->next->sort_key) break;
3925 hh = hh->next;
3926 }
3927 h->next = hh->next;
3928 hh->next = h;
3929 }
3930 }
3931
3932 hostlist = addrlist->host_list = newlist;
3933 }
3934
3935 /* Sort out the default port. */
3936
3937 if (!smtp_get_port(ob->port, addrlist, &defport, tid)) return FALSE;
3938
3939 /* For each host-plus-IP-address on the list:
3940
3941 . If this is a continued delivery and the host isn't the one with the
3942 current connection, skip.
3943
3944 . If the status is unusable (i.e. previously failed or retry checked), skip.
3945
3946 . If no IP address set, get the address, either by turning the name into
3947 an address, calling gethostbyname if gethostbyname is on, or by calling
3948 the DNS. The DNS may yield multiple addresses, in which case insert the
3949 extra ones into the list.
3950
3951 . Get the retry data if not previously obtained for this address and set the
3952 field which remembers the state of this address. Skip if the retry time is
3953 not reached. If not, remember whether retry data was found. The retry string
3954 contains both the name and the IP address.
3955
3956 . Scan the list of addresses and mark those whose status is DEFER as
3957 PENDING_DEFER. These are the only ones that will be processed in this cycle
3958 of the hosts loop.
3959
3960 . Make a delivery attempt - addresses marked PENDING_DEFER will be tried.
3961 Some addresses may be successfully delivered, others may fail, and yet
3962 others may get temporary errors and so get marked DEFER.
3963
3964 . The return from the delivery attempt is OK if a connection was made and a
3965 valid SMTP dialogue was completed. Otherwise it is DEFER.
3966
3967 . If OK, add a "remove" retry item for this host/IPaddress, if any.
3968
3969 . If fail to connect, or other defer state, add a retry item.
3970
3971 . If there are any addresses whose status is still DEFER, carry on to the
3972 next host/IPaddress, unless we have tried the number of hosts given
3973 by hosts_max_try or hosts_max_try_hardlimit; otherwise return. Note that
3974 there is some fancy logic for hosts_max_try that means its limit can be
3975 overstepped in some circumstances.
3976
3977 If we get to the end of the list, all hosts have deferred at least one address,
3978 or not reached their retry times. If delay_after_cutoff is unset, it requests a
3979 delivery attempt to those hosts whose last try was before the arrival time of
3980 the current message. To cope with this, we have to go round the loop a second
3981 time. After that, set the status and error data for any addresses that haven't
3982 had it set already. */
3983
3984 for (cutoff_retry = 0;
3985 expired && cutoff_retry < (ob->delay_after_cutoff ? 1 : 2);
3986 cutoff_retry++)
3987 {
3988 host_item *nexthost = NULL;
3989 int unexpired_hosts_tried = 0;
3990 BOOL continue_host_tried = FALSE;
3991
3992 retry_non_continued:
3993 for (host = hostlist;
3994 host
3995 && unexpired_hosts_tried < ob->hosts_max_try
3996 && total_hosts_tried < ob->hosts_max_try_hardlimit;
3997 host = nexthost)
3998 {
3999 int rc;
4000 int host_af;
4001 uschar *rs;
4002 BOOL host_is_expired = FALSE;
4003 BOOL message_defer = FALSE;
4004 BOOL some_deferred = FALSE;
4005 address_item *first_addr = NULL;
4006 uschar *interface = NULL;
4007 uschar *retry_host_key = NULL;
4008 uschar *retry_message_key = NULL;
4009 uschar *serialize_key = NULL;
4010
4011 /* Default next host is next host. :-) But this can vary if the
4012 hosts_max_try limit is hit (see below). It may also be reset if a host
4013 address is looked up here (in case the host was multihomed). */
4014
4015 nexthost = host->next;
4016
4017 /* If the address hasn't yet been obtained from the host name, look it up
4018 now, unless the host is already marked as unusable. If it is marked as
4019 unusable, it means that the router was unable to find its IP address (in
4020 the DNS or wherever) OR we are in the 2nd time round the cutoff loop, and
4021 the lookup failed last time. We don't get this far if *all* MX records
4022 point to non-existent hosts; that is treated as a hard error.
4023
4024 We can just skip this host entirely. When the hosts came from the router,
4025 the address will timeout based on the other host(s); when the address is
4026 looked up below, there is an explicit retry record added.
4027
4028 Note that we mustn't skip unusable hosts if the address is not unset; they
4029 may be needed as expired hosts on the 2nd time round the cutoff loop. */
4030
4031 if (!host->address)
4032 {
4033 int new_port, flags;
4034 host_item *hh;
4035
4036 if (host->status >= hstatus_unusable)
4037 {
4038 DEBUG(D_transport) debug_printf("%s has no address and is unusable - skipping\n",
4039 host->name);
4040 continue;
4041 }
4042
4043 DEBUG(D_transport) debug_printf("getting address for %s\n", host->name);
4044
4045 /* The host name is permitted to have an attached port. Find it, and
4046 strip it from the name. Just remember it for now. */
4047
4048 new_port = host_item_get_port(host);
4049
4050 /* Count hosts looked up */
4051
4052 hosts_looked_up++;
4053
4054 /* Find by name if so configured, or if it's an IP address. We don't
4055 just copy the IP address, because we need the test-for-local to happen. */
4056
4057 flags = HOST_FIND_BY_A | HOST_FIND_BY_AAAA;
4058 if (ob->dns_qualify_single) flags |= HOST_FIND_QUALIFY_SINGLE;
4059 if (ob->dns_search_parents) flags |= HOST_FIND_SEARCH_PARENTS;
4060
4061 if (ob->gethostbyname || string_is_ip_address(host->name, NULL) != 0)
4062 rc = host_find_byname(host, NULL, flags, NULL, TRUE);
4063 else
4064 rc = host_find_bydns(host, NULL, flags, NULL, NULL, NULL,
4065 &ob->dnssec, /* domains for request/require */
4066 NULL, NULL);
4067
4068 /* Update the host (and any additional blocks, resulting from
4069 multihoming) with a host-specific port, if any. */
4070
4071 for (hh = host; hh != nexthost; hh = hh->next) hh->port = new_port;
4072
4073 /* Failure to find the host at this time (usually DNS temporary failure)
4074 is really a kind of routing failure rather than a transport failure.
4075 Therefore we add a retry item of the routing kind, not to stop us trying
4076 to look this name up here again, but to ensure the address gets timed
4077 out if the failures go on long enough. A complete failure at this point
4078 commonly points to a configuration error, but the best action is still
4079 to carry on for the next host. */
4080
4081 if (rc == HOST_FIND_AGAIN || rc == HOST_FIND_SECURITY || rc == HOST_FIND_FAILED)
4082 {
4083 retry_add_item(addrlist, string_sprintf("R:%s", host->name), 0);
4084 expired = FALSE;
4085 if (rc == HOST_FIND_AGAIN) hosts_defer++; else hosts_fail++;
4086 DEBUG(D_transport) debug_printf("rc = %s for %s\n", (rc == HOST_FIND_AGAIN)?
4087 "HOST_FIND_AGAIN" : "HOST_FIND_FAILED", host->name);
4088 host->status = hstatus_unusable;
4089
4090 for (addr = addrlist; addr; addr = addr->next)
4091 {
4092 if (addr->transport_return != DEFER) continue;
4093 addr->basic_errno = ERRNO_UNKNOWNHOST;
4094 addr->message = string_sprintf(
4095 rc == HOST_FIND_SECURITY
4096 ? "lookup of IP address for %s was insecure"
4097 : "failed to lookup IP address for %s",
4098 host->name);
4099 }
4100 continue;
4101 }
4102
4103 /* If the host is actually the local host, we may have a problem, or
4104 there may be some cunning configuration going on. In the problem case,
4105 log things and give up. The default transport status is already DEFER. */
4106
4107 if (rc == HOST_FOUND_LOCAL && !ob->allow_localhost)
4108 {
4109 for (addr = addrlist; addr; addr = addr->next)
4110 {
4111 addr->basic_errno = 0;
4112 addr->message = string_sprintf("%s transport found host %s to be "
4113 "local", tblock->name, host->name);
4114 }
4115 goto END_TRANSPORT;
4116 }
4117 } /* End of block for IP address lookup */
4118
4119 /* If this is a continued delivery, we are interested only in the host
4120 which matches the name of the existing open channel. The check is put
4121 here after the local host lookup, in case the name gets expanded as a
4122 result of the lookup. Set expired FALSE, to save the outer loop executing
4123 twice. */
4124
4125 if (continue_hostname)
4126 if ( Ustrcmp(continue_hostname, host->name) != 0
4127 || Ustrcmp(continue_host_address, host->address) != 0
4128 )
4129 {
4130 expired = FALSE;
4131 continue; /* With next host */
4132 }
4133 else
4134 continue_host_tried = TRUE;
4135
4136 /* Reset the default next host in case a multihomed host whose addresses
4137 are not looked up till just above added to the host list. */
4138
4139 nexthost = host->next;
4140
4141 /* If queue_smtp is set (-odqs or the first part of a 2-stage run), or the
4142 domain is in queue_smtp_domains, we don't actually want to attempt any
4143 deliveries. When doing a queue run, queue_smtp_domains is always unset. If
4144 there is a lookup defer in queue_smtp_domains, proceed as if the domain
4145 were not in it. We don't want to hold up all SMTP deliveries! Except when
4146 doing a two-stage queue run, don't do this if forcing. */
4147
4148 if ((!deliver_force || queue_2stage) && (queue_smtp ||
4149 match_isinlist(addrlist->domain,
4150 (const uschar **)&queue_smtp_domains, 0,
4151 &domainlist_anchor, NULL, MCL_DOMAIN, TRUE, NULL) == OK))
4152 {
4153 expired = FALSE;
4154 for (addr = addrlist; addr; addr = addr->next)
4155 if (addr->transport_return == DEFER)
4156 addr->message = US"domain matches queue_smtp_domains, or -odqs set";
4157 continue; /* With next host */
4158 }
4159
4160 /* Count hosts being considered - purely for an intelligent comment
4161 if none are usable. */
4162
4163 hosts_total++;
4164
4165 /* Set $host and $host address now in case they are needed for the
4166 interface expansion or the serialize_hosts check; they remain set if an
4167 actual delivery happens. */
4168
4169 deliver_host = host->name;
4170 deliver_host_address = host->address;
4171 lookup_dnssec_authenticated = host->dnssec == DS_YES ? US"yes"
4172 : host->dnssec == DS_NO ? US"no"
4173 : US"";
4174
4175 /* Set up a string for adding to the retry key if the port number is not
4176 the standard SMTP port. A host may have its own port setting that overrides
4177 the default. */
4178
4179 pistring = string_sprintf(":%d", host->port == PORT_NONE
4180 ? defport : host->port);
4181 if (Ustrcmp(pistring, ":25") == 0) pistring = US"";
4182
4183 /* Select IPv4 or IPv6, and choose an outgoing interface. If the interface
4184 string is set, even if constant (as different transports can have different
4185 constant settings), we must add it to the key that is used for retries,
4186 because connections to the same host from a different interface should be
4187 treated separately. */
4188
4189 host_af = Ustrchr(host->address, ':') == NULL ? AF_INET : AF_INET6;
4190 if ((rs = ob->interface) && *rs)
4191 {
4192 if (!smtp_get_interface(rs, host_af, addrlist, &interface, tid))
4193 return FALSE;
4194 pistring = string_sprintf("%s/%s", pistring, interface);
4195 }
4196
4197 /* The first time round the outer loop, check the status of the host by
4198 inspecting the retry data. The second time round, we are interested only
4199 in expired hosts that haven't been tried since this message arrived. */
4200
4201 if (cutoff_retry == 0)
4202 {
4203 BOOL incl_ip;
4204 /* Ensure the status of the address is set by checking retry data if
4205 necessary. There may be host-specific retry data (applicable to all
4206 messages) and also data for retries of a specific message at this host.
4207 If either of these retry records are actually read, the keys used are
4208 returned to save recomputing them later. */
4209
4210 if (exp_bool(addrlist, US"transport", tblock->name, D_transport,
4211 US"retry_include_ip_address", ob->retry_include_ip_address,
4212 ob->expand_retry_include_ip_address, &incl_ip) != OK)
4213 continue; /* with next host */
4214
4215 host_is_expired = retry_check_address(addrlist->domain, host, pistring,
4216 incl_ip, &retry_host_key, &retry_message_key);
4217
4218 DEBUG(D_transport) debug_printf("%s [%s]%s retry-status = %s\n", host->name,
4219 (host->address == NULL)? US"" : host->address, pistring,
4220 (host->status == hstatus_usable)? "usable" :
4221 (host->status == hstatus_unusable)? "unusable" :
4222 (host->status == hstatus_unusable_expired)? "unusable (expired)" : "?");
4223
4224 /* Skip this address if not usable at this time, noting if it wasn't
4225 actually expired, both locally and in the address. */
4226
4227 switch (host->status)
4228 {
4229 case hstatus_unusable:
4230 expired = FALSE;
4231 setflag(addrlist, af_retry_skipped);
4232 /* Fall through */
4233
4234 case hstatus_unusable_expired:
4235 switch (host->why)
4236 {
4237 case hwhy_retry: hosts_retry++; break;
4238 case hwhy_failed: hosts_fail++; break;
4239 case hwhy_insecure:
4240 case hwhy_deferred: hosts_defer++; break;
4241 }
4242
4243 /* If there was a retry message key, implying that previously there
4244 was a message-specific defer, we don't want to update the list of
4245 messages waiting for these hosts. */
4246
4247 if (retry_message_key) update_waiting = FALSE;
4248 continue; /* With the next host or IP address */
4249 }
4250 }
4251
4252 /* Second time round the loop: if the address is set but expired, and
4253 the message is newer than the last try, let it through. */
4254
4255 else
4256 {
4257 if ( !host->address
4258 || host->status != hstatus_unusable_expired
4259 || host->last_try > received_time.tv_sec)
4260 continue;
4261 DEBUG(D_transport) debug_printf("trying expired host %s [%s]%s\n",
4262 host->name, host->address, pistring);
4263 host_is_expired = TRUE;
4264 }
4265
4266 /* Setting "expired=FALSE" doesn't actually mean not all hosts are expired;
4267 it remains TRUE only if all hosts are expired and none are actually tried.
4268 */
4269
4270 expired = FALSE;
4271
4272 /* If this host is listed as one to which access must be serialized,
4273 see if another Exim process has a connection to it, and if so, skip
4274 this host. If not, update the database to record our connection to it
4275 and remember this for later deletion. Do not do any of this if we are
4276 sending the message down a pre-existing connection. */
4277
4278 if ( !continue_hostname
4279 && verify_check_given_host(&ob->serialize_hosts, host) == OK)
4280 {
4281 serialize_key = string_sprintf("host-serialize-%s", host->name);
4282 if (!enq_start(serialize_key, 1))
4283 {
4284 DEBUG(D_transport)
4285 debug_printf("skipping host %s because another Exim process "
4286 "is connected to it\n", host->name);
4287 hosts_serial++;
4288 continue;
4289 }
4290 }
4291
4292 /* OK, we have an IP address that is not waiting for its retry time to
4293 arrive (it might be expired) OR (second time round the loop) we have an
4294 expired host that hasn't been tried since the message arrived. Have a go
4295 at delivering the message to it. First prepare the addresses by flushing
4296 out the result of previous attempts, and finding the first address that
4297 is still to be delivered. */
4298
4299 first_addr = prepare_addresses(addrlist, host);
4300
4301 DEBUG(D_transport) debug_printf("delivering %s to %s [%s] (%s%s)\n",
4302 message_id, host->name, host->address, addrlist->address,
4303 addrlist->next ? ", ..." : "");
4304
4305 set_process_info("delivering %s to %s [%s] (%s%s)",
4306 message_id, host->name, host->address, addrlist->address,
4307 addrlist->next ? ", ..." : "");
4308
4309 /* This is not for real; don't do the delivery. If there are
4310 any remaining hosts, list them. */
4311
4312 if (dont_deliver)
4313 {
4314 host_item *host2;
4315 set_errno_nohost(addrlist, 0, NULL, OK, FALSE);
4316 for (addr = addrlist; addr; addr = addr->next)
4317 {
4318 addr->host_used = host;
4319 addr->special_action = '*';
4320 addr->message = US"delivery bypassed by -N option";
4321 }
4322 DEBUG(D_transport)
4323 {
4324 debug_printf("*** delivery by %s transport bypassed by -N option\n"
4325 "*** host and remaining hosts:\n", tblock->name);
4326 for (host2 = host; host2; host2 = host2->next)
4327 debug_printf(" %s [%s]\n", host2->name,
4328 host2->address ? host2->address : US"unset");
4329 }
4330 rc = OK;
4331 }
4332
4333 /* This is for real. If the host is expired, we don't count it for
4334 hosts_max_retry. This ensures that all hosts must expire before an address
4335 is timed out, unless hosts_max_try_hardlimit (which protects against
4336 lunatic DNS configurations) is reached.
4337
4338 If the host is not expired and we are about to hit the hosts_max_retry
4339 limit, check to see if there is a subsequent hosts with a different MX
4340 value. If so, make that the next host, and don't count this one. This is a
4341 heuristic to make sure that different MXs do get tried. With a normal kind
4342 of retry rule, they would get tried anyway when the earlier hosts were
4343 delayed, but if the domain has a "retry every time" type of rule - as is
4344 often used for the the very large ISPs, that won't happen. */
4345
4346 else
4347 {
4348 host_item * thost;
4349 /* Make a copy of the host if it is local to this invocation
4350 of the transport. */
4351
4352 if (expanded_hosts)
4353 {
4354 thost = store_get(sizeof(host_item));
4355 *thost = *host;
4356 thost->name = string_copy(host->name);
4357 thost->address = string_copy(host->address);
4358 }
4359 else
4360 thost = host;
4361
4362 if (!host_is_expired && ++unexpired_hosts_tried >= ob->hosts_max_try)
4363 {
4364 host_item *h;
4365 DEBUG(D_transport)
4366 debug_printf("hosts_max_try limit reached with this host\n");
4367 for (h = host; h; h = h->next) if (h->mx != host->mx)
4368 {
4369 nexthost = h;
4370 unexpired_hosts_tried--;
4371 DEBUG(D_transport) debug_printf("however, a higher MX host exists "
4372 "and will be tried\n");
4373 break;
4374 }
4375 }
4376
4377 /* Attempt the delivery. */
4378
4379 total_hosts_tried++;
4380 rc = smtp_deliver(addrlist, thost, host_af, defport, interface, tblock,
4381 &message_defer, FALSE);
4382
4383 /* Yield is one of:
4384 OK => connection made, each address contains its result;
4385 message_defer is set for message-specific defers (when all
4386 recipients are marked defer)
4387 DEFER => there was a non-message-specific delivery problem;
4388 ERROR => there was a problem setting up the arguments for a filter,
4389 or there was a problem with expanding added headers
4390 */
4391
4392 /* If the result is not OK, there was a non-message-specific problem.
4393 If the result is DEFER, we need to write to the logs saying what happened
4394 for this particular host, except in the case of authentication and TLS
4395 failures, where the log has already been written. If all hosts defer a
4396 general message is written at the end. */
4397
4398 if (rc == DEFER && first_addr->basic_errno != ERRNO_AUTHFAIL
4399 && first_addr->basic_errno != ERRNO_TLSFAILURE)
4400 write_logs(host, first_addr->message, first_addr->basic_errno);
4401
4402 #ifndef DISABLE_EVENT
4403 if (rc == DEFER)
4404 deferred_event_raise(first_addr, host);
4405 #endif
4406
4407 /* If STARTTLS was accepted, but there was a failure in setting up the
4408 TLS session (usually a certificate screwup), and the host is not in
4409 hosts_require_tls, and tls_tempfail_tryclear is true, try again, with
4410 TLS forcibly turned off. We have to start from scratch with a new SMTP
4411 connection. That's why the retry is done from here, not from within
4412 smtp_deliver(). [Rejections of STARTTLS itself don't screw up the
4413 session, so the in-clear transmission after those errors, if permitted,
4414 happens inside smtp_deliver().] */
4415
4416 #ifdef SUPPORT_TLS
4417 if ( rc == DEFER
4418 && first_addr->basic_errno == ERRNO_TLSFAILURE
4419 && ob->tls_tempfail_tryclear
4420 && verify_check_given_host(&ob->hosts_require_tls, host) != OK
4421 )
4422 {
4423 log_write(0, LOG_MAIN,
4424 "%s: delivering unencrypted to H=%s [%s] (not in hosts_require_tls)",
4425 first_addr->message, host->name, host->address);
4426 first_addr = prepare_addresses(addrlist, host);
4427 rc = smtp_deliver(addrlist, thost, host_af, defport, interface, tblock,
4428 &message_defer, TRUE);
4429 if (rc == DEFER && first_addr->basic_errno != ERRNO_AUTHFAIL)
4430 write_logs(host, first_addr->message, first_addr->basic_errno);
4431 # ifndef DISABLE_EVENT
4432 if (rc == DEFER)
4433 deferred_event_raise(first_addr, host);
4434 # endif
4435 }
4436 #endif /*SUPPORT_TLS*/
4437 }
4438
4439 /* Delivery attempt finished */
4440
4441 rs = rc == OK ? US"OK"
4442 : rc == DEFER ? US"DEFER"
4443 : rc == ERROR ? US"ERROR"
4444 : US"?";
4445
4446 set_process_info("delivering %s: just tried %s [%s] for %s%s: result %s",
4447 message_id, host->name, host->address, addrlist->address,
4448 addrlist->next ? " (& others)" : "", rs);
4449
4450 /* Release serialization if set up */
4451
4452 if (serialize_key) enq_end(serialize_key);
4453
4454 /* If the result is DEFER, or if a host retry record is known to exist, we
4455 need to add an item to the retry chain for updating the retry database
4456 at the end of delivery. We only need to add the item to the top address,
4457 of course. Also, if DEFER, we mark the IP address unusable so as to skip it
4458 for any other delivery attempts using the same address. (It is copied into
4459 the unusable tree at the outer level, so even if different address blocks
4460 contain the same address, it still won't get tried again.) */
4461
4462 if (rc == DEFER || retry_host_key)
4463 {
4464 int delete_flag = rc != DEFER ? rf_delete : 0;
4465 if (!retry_host_key)
4466 {
4467 BOOL incl_ip;
4468 if (exp_bool(addrlist, US"transport", tblock->name, D_transport,
4469 US"retry_include_ip_address", ob->retry_include_ip_address,
4470 ob->expand_retry_include_ip_address, &incl_ip) != OK)
4471 incl_ip = TRUE; /* error; use most-specific retry record */
4472
4473 retry_host_key = incl_ip
4474 ? string_sprintf("T:%S:%s%s", host->name, host->address, pistring)
4475 : string_sprintf("T:%S%s", host->name, pistring);
4476 }
4477
4478 /* If a delivery of another message over an existing SMTP connection
4479 yields DEFER, we do NOT set up retry data for the host. This covers the
4480 case when there are delays in routing the addresses in the second message
4481 that are so long that the server times out. This is alleviated by not
4482 routing addresses that previously had routing defers when handling an
4483 existing connection, but even so, this case may occur (e.g. if a
4484 previously happily routed address starts giving routing defers). If the
4485 host is genuinely down, another non-continued message delivery will
4486 notice it soon enough. */
4487
4488 if (delete_flag != 0 || !continue_hostname)
4489 retry_add_item(first_addr, retry_host_key, rf_host | delete_flag);
4490
4491 /* We may have tried an expired host, if its retry time has come; ensure
4492 the status reflects the expiry for the benefit of any other addresses. */
4493
4494 if (rc == DEFER)
4495 {
4496 host->status = host_is_expired
4497 ? hstatus_unusable_expired : hstatus_unusable;
4498 host->why = hwhy_deferred;
4499 }
4500 }
4501
4502 /* If message_defer is set (host was OK, but every recipient got deferred
4503 because of some message-specific problem), or if that had happened
4504 previously so that a message retry key exists, add an appropriate item
4505 to the retry chain. Note that if there was a message defer but now there is
4506 a host defer, the message defer record gets deleted. That seems perfectly
4507 reasonable. Also, stop the message from being remembered as waiting
4508 for specific hosts. */
4509
4510 if (message_defer || retry_message_key)
4511 {
4512 int delete_flag = message_defer ? 0 : rf_delete;
4513 if (!retry_message_key)
4514 {
4515 BOOL incl_ip;
4516 if (exp_bool(addrlist, US"transport", tblock->name, D_transport,
4517 US"retry_include_ip_address", ob->retry_include_ip_address,
4518 ob->expand_retry_include_ip_address, &incl_ip) != OK)
4519 incl_ip = TRUE; /* error; use most-specific retry record */
4520
4521 retry_message_key = incl_ip
4522 ? string_sprintf("T:%S:%s%s:%s", host->name, host->address, pistring,
4523 message_id)
4524 : string_sprintf("T:%S%s:%s", host->name, pistring, message_id);
4525 }
4526 retry_add_item(addrlist, retry_message_key,
4527 rf_message | rf_host | delete_flag);
4528 update_waiting = FALSE;
4529 }
4530
4531 /* Any return other than DEFER (that is, OK or ERROR) means that the
4532 addresses have got their final statuses filled in for this host. In the OK
4533 case, see if any of them are deferred. */
4534
4535 if (rc == OK)
4536 for (addr = addrlist; addr; addr = addr->next)
4537 if (addr->transport_return == DEFER)
4538 {
4539 some_deferred = TRUE;
4540 break;
4541 }
4542
4543 /* If no addresses deferred or the result was ERROR, return. We do this for
4544 ERROR because a failing filter set-up or add_headers expansion is likely to
4545 fail for any host we try. */
4546
4547 if (rc == ERROR || (rc == OK && !some_deferred))
4548 {
4549 DEBUG(D_transport) debug_printf("Leaving %s transport\n", tblock->name);
4550 return TRUE; /* Each address has its status */
4551 }
4552
4553 /* If the result was DEFER or some individual addresses deferred, let
4554 the loop run to try other hosts with the deferred addresses, except for the
4555 case when we were trying to deliver down an existing channel and failed.
4556 Don't try any other hosts in this case. */
4557
4558 if (continue_hostname) break;
4559
4560 /* If the whole delivery, or some individual addresses, were deferred and
4561 there are more hosts that could be tried, do not count this host towards
4562 the hosts_max_try limit if the age of the message is greater than the
4563 maximum retry time for this host. This means we may try try all hosts,
4564 ignoring the limit, when messages have been around for some time. This is
4565 important because if we don't try all hosts, the address will never time
4566 out. NOTE: this does not apply to hosts_max_try_hardlimit. */
4567
4568 if ((rc == DEFER || some_deferred) && nexthost)
4569 {
4570 BOOL timedout;
4571 retry_config *retry = retry_find_config(host->name, NULL, 0, 0);
4572
4573 if (retry && retry->rules)
4574 {
4575 retry_rule *last_rule;
4576 for (last_rule = retry->rules;
4577 last_rule->next;
4578 last_rule = last_rule->next);
4579 timedout = time(NULL) - received_time.tv_sec > last_rule->timeout;
4580 }
4581 else timedout = TRUE; /* No rule => timed out */
4582
4583 if (timedout)
4584 {
4585 unexpired_hosts_tried--;
4586 DEBUG(D_transport) debug_printf("temporary delivery error(s) override "
4587 "hosts_max_try (message older than host's retry time)\n");
4588 }
4589 }
4590 } /* End of loop for trying multiple hosts. */
4591
4592 /* If we failed to find a matching host in the list, for an already-open
4593 connection, just close it and start over with the list. This can happen
4594 for routing that changes from run to run, or big multi-IP sites with
4595 round-robin DNS. */
4596
4597 if (continue_hostname && !continue_host_tried)
4598 {
4599 int fd = cutthrough.fd >= 0 ? cutthrough.fd : 0;
4600
4601 DEBUG(D_transport) debug_printf("no hosts match already-open connection\n");
4602 #ifdef SUPPORT_TLS
4603 if (tls_out.active == fd)
4604 {
4605 (void) tls_write(FALSE, US"QUIT\r\n", 6, FALSE);
4606 tls_close(FALSE, TLS_SHUTDOWN_NOWAIT);
4607 }
4608 else
4609 #else
4610 (void) write(fd, US"QUIT\r\n", 6);
4611 #endif
4612 (void) close(fd);
4613 cutthrough.fd = -1;
4614 continue_hostname = NULL;
4615 goto retry_non_continued;
4616 }
4617
4618 /* This is the end of the loop that repeats iff expired is TRUE and
4619 ob->delay_after_cutoff is FALSE. The second time round we will
4620 try those hosts that haven't been tried since the message arrived. */
4621
4622 DEBUG(D_transport)
4623 {
4624 debug_printf("all IP addresses skipped or deferred at least one address\n");
4625 if (expired && !ob->delay_after_cutoff && cutoff_retry == 0)
4626 debug_printf("retrying IP addresses not tried since message arrived\n");
4627 }
4628 }
4629
4630
4631 /* Get here if all IP addresses are skipped or defer at least one address. In
4632 MUA wrapper mode, this will happen only for connection or other non-message-
4633 specific failures. Force the delivery status for all addresses to FAIL. */
4634
4635 if (mua_wrapper)
4636 {
4637 for (addr = addrlist; addr; addr = addr->next)
4638 addr->transport_return = FAIL;
4639 goto END_TRANSPORT;
4640 }
4641
4642 /* In the normal, non-wrapper case, add a standard message to each deferred
4643 address if there hasn't been an error, that is, if it hasn't actually been
4644 tried this time. The variable "expired" will be FALSE if any deliveries were
4645 actually tried, or if there was at least one host that was not expired. That
4646 is, it is TRUE only if no deliveries were tried and all hosts were expired. If
4647 a delivery has been tried, an error code will be set, and the failing of the
4648 message is handled by the retry code later.
4649
4650 If queue_smtp is set, or this transport was called to send a subsequent message
4651 down an existing TCP/IP connection, and something caused the host not to be
4652 found, we end up here, but can detect these cases and handle them specially. */
4653
4654 for (addr = addrlist; addr; addr = addr->next)
4655 {
4656 /* If host is not NULL, it means that we stopped processing the host list
4657 because of hosts_max_try or hosts_max_try_hardlimit. In the former case, this
4658 means we need to behave as if some hosts were skipped because their retry
4659 time had not come. Specifically, this prevents the address from timing out.
4660 However, if we have hit hosts_max_try_hardlimit, we want to behave as if all
4661 hosts were tried. */
4662
4663 if (host)
4664 if (total_hosts_tried >= ob->hosts_max_try_hardlimit)
4665 {
4666 DEBUG(D_transport)
4667 debug_printf("hosts_max_try_hardlimit reached: behave as if all "
4668 "hosts were tried\n");
4669 }
4670 else
4671 {
4672 DEBUG(D_transport)
4673 debug_printf("hosts_max_try limit caused some hosts to be skipped\n");
4674 setflag(addr, af_retry_skipped);
4675 }
4676
4677 if (queue_smtp) /* no deliveries attempted */
4678 {
4679 addr->transport_return = DEFER;
4680 addr->basic_errno = 0;
4681 addr->message = US"SMTP delivery explicitly queued";
4682 }
4683
4684 else if ( addr->transport_return == DEFER
4685 && (addr->basic_errno == ERRNO_UNKNOWNERROR || addr->basic_errno == 0)
4686 && !addr->message
4687 )
4688 {
4689 addr->basic_errno = ERRNO_HRETRY;
4690 if (continue_hostname)
4691 addr->message = US"no host found for existing SMTP connection";
4692 else if (expired)
4693 {
4694 setflag(addr, af_pass_message); /* This is not a security risk */
4695 addr->message = string_sprintf(
4696 "all hosts%s have been failing for a long time %s",
4697 addr->domain ? string_sprintf(" for '%s'", addr->domain) : US"",
4698 ob->delay_after_cutoff
4699 ? US"(and retry time not reached)"
4700 : US"and were last tried after this message arrived");
4701
4702 /* If we are already using fallback hosts, or there are no fallback hosts
4703 defined, convert the result to FAIL to cause a bounce. */
4704
4705 if (addr->host_list == addr->fallback_hosts || !addr->fallback_hosts)
4706 addr->transport_return = FAIL;
4707 }
4708 else
4709 {
4710 const char * s;
4711 if (hosts_retry == hosts_total)
4712 s = "retry time not reached for any host%s";
4713 else if (hosts_fail == hosts_total)
4714 s = "all host address lookups%s failed permanently";
4715 else if (hosts_defer == hosts_total)
4716 s = "all host address lookups%s failed temporarily";
4717 else if (hosts_serial == hosts_total)
4718 s = "connection limit reached for all hosts%s";
4719 else if (hosts_fail+hosts_defer == hosts_total)
4720 s = "all host address lookups%s failed";
4721 else
4722 s = "some host address lookups failed and retry time "
4723 "not reached for other hosts or connection limit reached%s";
4724
4725 addr->message = string_sprintf(s,
4726 addr->domain ? string_sprintf(" for '%s'", addr->domain) : US"");
4727 }
4728 }
4729 }
4730
4731 /* Update the database which keeps information about which messages are waiting
4732 for which hosts to become available. For some message-specific errors, the
4733 update_waiting flag is turned off because we don't want follow-on deliveries in
4734 those cases. If this transport instance is explicitly limited to one message
4735 per connection then follow-on deliveries are not possible and there's no need
4736 to create/update the per-transport wait-<transport_name> database. */
4737
4738 if (update_waiting && tblock->connection_max_messages != 1)
4739 transport_update_waiting(hostlist, tblock->name);
4740
4741 END_TRANSPORT:
4742
4743 DEBUG(D_transport) debug_printf("Leaving %s transport\n", tblock->name);
4744
4745 return TRUE; /* Each address has its status */
4746 }
4747
4748 #endif /*!MACRO_PREDEF*/
4749 /* vi: aw ai sw=2
4750 */
4751 /* End of transport/smtp.c */
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